net/netfilter/nf_tables_api.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
   4  *
   5  * Development of this code funded by Astaro AG (http://www.astaro.com/)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/list.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/netlink.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/rhashtable.h>
  15 #include <linux/audit.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter/nfnetlink.h>
  18 #include <linux/netfilter/nf_tables.h>
  19 #include <net/netfilter/nf_flow_table.h>
  20 #include <net/netfilter/nf_tables_core.h>
  21 #include <net/netfilter/nf_tables.h>
  22 #include <net/netfilter/nf_tables_offload.h>
  23 #include <net/net_namespace.h>
  24 #include <net/sock.h>
  25
  26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
  27 #define NFT_SET_MAX_ANONLEN 16
  28
  29 unsigned int nf_tables_net_id __read_mostly;
  30
  31 static LIST_HEAD(nf_tables_expressions);
  32 static LIST_HEAD(nf_tables_objects);
  33 static LIST_HEAD(nf_tables_flowtables);
  34 static LIST_HEAD(nf_tables_destroy_list);
  35 static LIST_HEAD(nf_tables_gc_list);
  36 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  37 static DEFINE_SPINLOCK(nf_tables_gc_list_lock);
  38
  39 enum {
  40         NFT_VALIDATE_SKIP       = 0,
  41         NFT_VALIDATE_NEED,
  42         NFT_VALIDATE_DO,
  43 };
  44
  45 static struct rhltable nft_objname_ht;
  46
  47 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  48 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  49 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  50
  51 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  52 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  53 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  54
  55 static const struct rhashtable_params nft_chain_ht_params = {
  56         .head_offset            = offsetof(struct nft_chain, rhlhead),
  57         .key_offset             = offsetof(struct nft_chain, name),
  58         .hashfn                 = nft_chain_hash,
  59         .obj_hashfn             = nft_chain_hash_obj,
  60         .obj_cmpfn              = nft_chain_hash_cmp,
  61         .automatic_shrinking    = true,
  62 };
  63
  64 static const struct rhashtable_params nft_objname_ht_params = {
  65         .head_offset            = offsetof(struct nft_object, rhlhead),
  66         .key_offset             = offsetof(struct nft_object, key),
  67         .hashfn                 = nft_objname_hash,
  68         .obj_hashfn             = nft_objname_hash_obj,
  69         .obj_cmpfn              = nft_objname_hash_cmp,
  70         .automatic_shrinking    = true,
  71 };
  72
  73 struct nft_audit_data {
  74         struct nft_table *table;
  75         int entries;
  76         int op;
  77         struct list_head list;
  78 };
  79
  80 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  81         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  82         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  83         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  84         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  85         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  86         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  87         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  88         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  89         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  90         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  91         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  92         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  93         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  94         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  95         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  96         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  97         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  98         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  99         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
 100         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
 101         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
 102         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 103         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 104         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 105         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 106         [NFT_MSG_GETSETELEM_RESET] = AUDIT_NFT_OP_SETELEM_RESET,
 107 };
 108
 109 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
 110 {
 111         switch (table->validate_state) {
 112         case NFT_VALIDATE_SKIP:
 113                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 114                 break;
 115         case NFT_VALIDATE_NEED:
 116                 break;
 117         case NFT_VALIDATE_DO:
 118                 if (new_validate_state == NFT_VALIDATE_NEED)
 119                         return;
 120         }
 121
 122         table->validate_state = new_validate_state;
 123 }
 124 static void nf_tables_trans_destroy_work(struct work_struct *w);
 125 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 126
 127 static void nft_trans_gc_work(struct work_struct *work);
 128 static DECLARE_WORK(trans_gc_work, nft_trans_gc_work);
 129
 130 static void nft_ctx_init(struct nft_ctx *ctx,
 131                          struct net *net,
 132                          const struct sk_buff *skb,
 133                          const struct nlmsghdr *nlh,
 134                          u8 family,
 135                          struct nft_table *table,
 136                          struct nft_chain *chain,
 137                          const struct nlattr * const *nla)
 138 {
 139         ctx->net        = net;
 140         ctx->family     = family;
 141         ctx->level      = 0;
 142         ctx->table      = table;
 143         ctx->chain      = chain;
 144         ctx->nla        = nla;
 145         ctx->portid     = NETLINK_CB(skb).portid;
 146         ctx->report     = nlmsg_report(nlh);
 147         ctx->flags      = nlh->nlmsg_flags;
 148         ctx->seq        = nlh->nlmsg_seq;
 149 }
 150
 151 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 152                                              int msg_type, u32 size, gfp_t gfp)
 153 {
 154         struct nft_trans *trans;
 155
 156         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 157         if (trans == NULL)
 158                 return NULL;
 159
 160         INIT_LIST_HEAD(&trans->list);
 161         INIT_LIST_HEAD(&trans->binding_list);
 162         trans->msg_type = msg_type;
 163         trans->ctx      = *ctx;
 164
 165         return trans;
 166 }
 167
 168 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 169                                          int msg_type, u32 size)
 170 {
 171         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 172 }
 173
 174 static void nft_trans_list_del(struct nft_trans *trans)
 175 {
 176         list_del(&trans->list);
 177         list_del(&trans->binding_list);
 178 }
 179
 180 static void nft_trans_destroy(struct nft_trans *trans)
 181 {
 182         nft_trans_list_del(trans);
 183         kfree(trans);
 184 }
 185
 186 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
 187                                  bool bind)
 188 {
 189         struct nftables_pernet *nft_net;
 190         struct net *net = ctx->net;
 191         struct nft_trans *trans;
 192
 193         if (!nft_set_is_anonymous(set))
 194                 return;
 195
 196         nft_net = nft_pernet(net);
 197         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 198                 switch (trans->msg_type) {
 199                 case NFT_MSG_NEWSET:
 200                         if (nft_trans_set(trans) == set)
 201                                 nft_trans_set_bound(trans) = bind;
 202                         break;
 203                 case NFT_MSG_NEWSETELEM:
 204                         if (nft_trans_elem_set(trans) == set)
 205                                 nft_trans_elem_set_bound(trans) = bind;
 206                         break;
 207                 }
 208         }
 209 }
 210
 211 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 212 {
 213         return __nft_set_trans_bind(ctx, set, true);
 214 }
 215
 216 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
 217 {
 218         return __nft_set_trans_bind(ctx, set, false);
 219 }
 220
 221 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
 222                                    struct nft_chain *chain, bool bind)
 223 {
 224         struct nftables_pernet *nft_net;
 225         struct net *net = ctx->net;
 226         struct nft_trans *trans;
 227
 228         if (!nft_chain_binding(chain))
 229                 return;
 230
 231         nft_net = nft_pernet(net);
 232         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 233                 switch (trans->msg_type) {
 234                 case NFT_MSG_NEWCHAIN:
 235                         if (nft_trans_chain(trans) == chain)
 236                                 nft_trans_chain_bound(trans) = bind;
 237                         break;
 238                 case NFT_MSG_NEWRULE:
 239                         if (trans->ctx.chain == chain)
 240                                 nft_trans_rule_bound(trans) = bind;
 241                         break;
 242                 }
 243         }
 244 }
 245
 246 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
 247                                  struct nft_chain *chain)
 248 {
 249         __nft_chain_trans_bind(ctx, chain, true);
 250 }
 251
 252 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
 253 {
 254         if (!nft_chain_binding(chain))
 255                 return 0;
 256
 257         if (nft_chain_binding(ctx->chain))
 258                 return -EOPNOTSUPP;
 259
 260         if (chain->bound)
 261                 return -EBUSY;
 262
 263         if (!nft_use_inc(&chain->use))
 264                 return -EMFILE;
 265
 266         chain->bound = true;
 267         nft_chain_trans_bind(ctx, chain);
 268
 269         return 0;
 270 }
 271
 272 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
 273 {
 274         __nft_chain_trans_bind(ctx, chain, false);
 275 }
 276
 277 static int nft_netdev_register_hooks(struct net *net,
 278                                      struct list_head *hook_list)
 279 {
 280         struct nft_hook *hook;
 281         int err, j;
 282
 283         j = 0;
 284         list_for_each_entry(hook, hook_list, list) {
 285                 err = nf_register_net_hook(net, &hook->ops);
 286                 if (err < 0)
 287                         goto err_register;
 288
 289                 j++;
 290         }
 291         return 0;
 292
 293 err_register:
 294         list_for_each_entry(hook, hook_list, list) {
 295                 if (j-- <= 0)
 296                         break;
 297
 298                 nf_unregister_net_hook(net, &hook->ops);
 299         }
 300         return err;
 301 }
 302
 303 static void nft_netdev_unregister_hooks(struct net *net,
 304                                         struct list_head *hook_list,
 305                                         bool release_netdev)
 306 {
 307         struct nft_hook *hook, *next;
 308
 309         list_for_each_entry_safe(hook, next, hook_list, list) {
 310                 nf_unregister_net_hook(net, &hook->ops);
 311                 if (release_netdev) {
 312                         list_del(&hook->list);
 313                         kfree_rcu(hook, rcu);
 314                 }
 315         }
 316 }
 317
 318 static int nf_tables_register_hook(struct net *net,
 319                                    const struct nft_table *table,
 320                                    struct nft_chain *chain)
 321 {
 322         struct nft_base_chain *basechain;
 323         const struct nf_hook_ops *ops;
 324
 325         if (table->flags & NFT_TABLE_F_DORMANT ||
 326             !nft_is_base_chain(chain))
 327                 return 0;
 328
 329         basechain = nft_base_chain(chain);
 330         ops = &basechain->ops;
 331
 332         if (basechain->type->ops_register)
 333                 return basechain->type->ops_register(net, ops);
 334
 335         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 336                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 337
 338         return nf_register_net_hook(net, &basechain->ops);
 339 }
 340
 341 static void __nf_tables_unregister_hook(struct net *net,
 342                                         const struct nft_table *table,
 343                                         struct nft_chain *chain,
 344                                         bool release_netdev)
 345 {
 346         struct nft_base_chain *basechain;
 347         const struct nf_hook_ops *ops;
 348
 349         if (table->flags & NFT_TABLE_F_DORMANT ||
 350             !nft_is_base_chain(chain))
 351                 return;
 352         basechain = nft_base_chain(chain);
 353         ops = &basechain->ops;
 354
 355         if (basechain->type->ops_unregister)
 356                 return basechain->type->ops_unregister(net, ops);
 357
 358         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 359                 nft_netdev_unregister_hooks(net, &basechain->hook_list,
 360                                             release_netdev);
 361         else
 362                 nf_unregister_net_hook(net, &basechain->ops);
 363 }
 364
 365 static void nf_tables_unregister_hook(struct net *net,
 366                                       const struct nft_table *table,
 367                                       struct nft_chain *chain)
 368 {
 369         return __nf_tables_unregister_hook(net, table, chain, false);
 370 }
 371
 372 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 373 {
 374         struct nftables_pernet *nft_net = nft_pernet(net);
 375
 376         switch (trans->msg_type) {
 377         case NFT_MSG_NEWSET:
 378                 if (!nft_trans_set_update(trans) &&
 379                     nft_set_is_anonymous(nft_trans_set(trans)))
 380                         list_add_tail(&trans->binding_list, &nft_net->binding_list);
 381                 break;
 382         case NFT_MSG_NEWCHAIN:
 383                 if (!nft_trans_chain_update(trans) &&
 384                     nft_chain_binding(nft_trans_chain(trans)))
 385                         list_add_tail(&trans->binding_list, &nft_net->binding_list);
 386                 break;
 387         }
 388
 389         list_add_tail(&trans->list, &nft_net->commit_list);
 390 }
 391
 392 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 393 {
 394         struct nft_trans *trans;
 395
 396         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 397         if (trans == NULL)
 398                 return -ENOMEM;
 399
 400         if (msg_type == NFT_MSG_NEWTABLE)
 401                 nft_activate_next(ctx->net, ctx->table);
 402
 403         nft_trans_commit_list_add_tail(ctx->net, trans);
 404         return 0;
 405 }
 406
 407 static int nft_deltable(struct nft_ctx *ctx)
 408 {
 409         int err;
 410
 411         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 412         if (err < 0)
 413                 return err;
 414
 415         nft_deactivate_next(ctx->net, ctx->table);
 416         return err;
 417 }
 418
 419 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 420 {
 421         struct nft_trans *trans;
 422
 423         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 424         if (trans == NULL)
 425                 return ERR_PTR(-ENOMEM);
 426
 427         if (msg_type == NFT_MSG_NEWCHAIN) {
 428                 nft_activate_next(ctx->net, ctx->chain);
 429
 430                 if (ctx->nla[NFTA_CHAIN_ID]) {
 431                         nft_trans_chain_id(trans) =
 432                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 433                 }
 434         }
 435         nft_trans_chain(trans) = ctx->chain;
 436         nft_trans_commit_list_add_tail(ctx->net, trans);
 437
 438         return trans;
 439 }
 440
 441 static int nft_delchain(struct nft_ctx *ctx)
 442 {
 443         struct nft_trans *trans;
 444
 445         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 446         if (IS_ERR(trans))
 447                 return PTR_ERR(trans);
 448
 449         nft_use_dec(&ctx->table->use);
 450         nft_deactivate_next(ctx->net, ctx->chain);
 451
 452         return 0;
 453 }
 454
 455 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
 456 {
 457         struct nft_expr *expr;
 458
 459         expr = nft_expr_first(rule);
 460         while (nft_expr_more(rule, expr)) {
 461                 if (expr->ops->activate)
 462                         expr->ops->activate(ctx, expr);
 463
 464                 expr = nft_expr_next(expr);
 465         }
 466 }
 467
 468 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
 469                               enum nft_trans_phase phase)
 470 {
 471         struct nft_expr *expr;
 472
 473         expr = nft_expr_first(rule);
 474         while (nft_expr_more(rule, expr)) {
 475                 if (expr->ops->deactivate)
 476                         expr->ops->deactivate(ctx, expr, phase);
 477
 478                 expr = nft_expr_next(expr);
 479         }
 480 }
 481
 482 static int
 483 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 484 {
 485         /* You cannot delete the same rule twice */
 486         if (nft_is_active_next(ctx->net, rule)) {
 487                 nft_deactivate_next(ctx->net, rule);
 488                 nft_use_dec(&ctx->chain->use);
 489                 return 0;
 490         }
 491         return -ENOENT;
 492 }
 493
 494 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 495                                             struct nft_rule *rule)
 496 {
 497         struct nft_trans *trans;
 498
 499         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 500         if (trans == NULL)
 501                 return NULL;
 502
 503         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 504                 nft_trans_rule_id(trans) =
 505                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 506         }
 507         nft_trans_rule(trans) = rule;
 508         nft_trans_commit_list_add_tail(ctx->net, trans);
 509
 510         return trans;
 511 }
 512
 513 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 514 {
 515         struct nft_flow_rule *flow;
 516         struct nft_trans *trans;
 517         int err;
 518
 519         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 520         if (trans == NULL)
 521                 return -ENOMEM;
 522
 523         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 524                 flow = nft_flow_rule_create(ctx->net, rule);
 525                 if (IS_ERR(flow)) {
 526                         nft_trans_destroy(trans);
 527                         return PTR_ERR(flow);
 528                 }
 529
 530                 nft_trans_flow_rule(trans) = flow;
 531         }
 532
 533         err = nf_tables_delrule_deactivate(ctx, rule);
 534         if (err < 0) {
 535                 nft_trans_destroy(trans);
 536                 return err;
 537         }
 538         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 539
 540         return 0;
 541 }
 542
 543 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 544 {
 545         struct nft_rule *rule;
 546         int err;
 547
 548         list_for_each_entry(rule, &ctx->chain->rules, list) {
 549                 if (!nft_is_active_next(ctx->net, rule))
 550                         continue;
 551
 552                 err = nft_delrule(ctx, rule);
 553                 if (err < 0)
 554                         return err;
 555         }
 556         return 0;
 557 }
 558
 559 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 560                                struct nft_set *set,
 561                                const struct nft_set_desc *desc)
 562 {
 563         struct nft_trans *trans;
 564
 565         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 566         if (trans == NULL)
 567                 return -ENOMEM;
 568
 569         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
 570                 nft_trans_set_id(trans) =
 571                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 572                 nft_activate_next(ctx->net, set);
 573         }
 574         nft_trans_set(trans) = set;
 575         if (desc) {
 576                 nft_trans_set_update(trans) = true;
 577                 nft_trans_set_gc_int(trans) = desc->gc_int;
 578                 nft_trans_set_timeout(trans) = desc->timeout;
 579                 nft_trans_set_size(trans) = desc->size;
 580         }
 581         nft_trans_commit_list_add_tail(ctx->net, trans);
 582
 583         return 0;
 584 }
 585
 586 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 587                              struct nft_set *set)
 588 {
 589         return __nft_trans_set_add(ctx, msg_type, set, NULL);
 590 }
 591
 592 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
 593                                   struct nft_set *set,
 594                                   const struct nft_set_iter *iter,
 595                                   struct nft_elem_priv *elem_priv)
 596 {
 597         nft_setelem_data_deactivate(ctx->net, set, elem_priv);
 598
 599         return 0;
 600 }
 601
 602 struct nft_set_elem_catchall {
 603         struct list_head        list;
 604         struct rcu_head         rcu;
 605         struct nft_elem_priv    *elem;
 606 };
 607
 608 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
 609                                         struct nft_set *set)
 610 {
 611         u8 genmask = nft_genmask_next(ctx->net);
 612         struct nft_set_elem_catchall *catchall;
 613         struct nft_set_ext *ext;
 614
 615         list_for_each_entry(catchall, &set->catchall_list, list) {
 616                 ext = nft_set_elem_ext(set, catchall->elem);
 617                 if (!nft_set_elem_active(ext, genmask))
 618                         continue;
 619
 620                 nft_setelem_data_deactivate(ctx->net, set, catchall->elem);
 621                 break;
 622         }
 623 }
 624
 625 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
 626 {
 627         struct nft_set_iter iter = {
 628                 .genmask        = nft_genmask_next(ctx->net),
 629                 .fn             = nft_mapelem_deactivate,
 630         };
 631
 632         set->ops->walk(ctx, set, &iter);
 633         WARN_ON_ONCE(iter.err);
 634
 635         nft_map_catchall_deactivate(ctx, set);
 636 }
 637
 638 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 639 {
 640         int err;
 641
 642         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 643         if (err < 0)
 644                 return err;
 645
 646         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
 647                 nft_map_deactivate(ctx, set);
 648
 649         nft_deactivate_next(ctx->net, set);
 650         nft_use_dec(&ctx->table->use);
 651
 652         return err;
 653 }
 654
 655 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 656                              struct nft_object *obj)
 657 {
 658         struct nft_trans *trans;
 659
 660         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 661         if (trans == NULL)
 662                 return -ENOMEM;
 663
 664         if (msg_type == NFT_MSG_NEWOBJ)
 665                 nft_activate_next(ctx->net, obj);
 666
 667         nft_trans_obj(trans) = obj;
 668         nft_trans_commit_list_add_tail(ctx->net, trans);
 669
 670         return 0;
 671 }
 672
 673 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 674 {
 675         int err;
 676
 677         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 678         if (err < 0)
 679                 return err;
 680
 681         nft_deactivate_next(ctx->net, obj);
 682         nft_use_dec(&ctx->table->use);
 683
 684         return err;
 685 }
 686
 687 static struct nft_trans *
 688 nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 689                         struct nft_flowtable *flowtable)
 690 {
 691         struct nft_trans *trans;
 692
 693         trans = nft_trans_alloc(ctx, msg_type,
 694                                 sizeof(struct nft_trans_flowtable));
 695         if (trans == NULL)
 696                 return ERR_PTR(-ENOMEM);
 697
 698         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 699                 nft_activate_next(ctx->net, flowtable);
 700
 701         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
 702         nft_trans_flowtable(trans) = flowtable;
 703         nft_trans_commit_list_add_tail(ctx->net, trans);
 704
 705         return trans;
 706 }
 707
 708 static int nft_delflowtable(struct nft_ctx *ctx,
 709                             struct nft_flowtable *flowtable)
 710 {
 711         struct nft_trans *trans;
 712
 713         trans = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 714         if (IS_ERR(trans))
 715                 return PTR_ERR(trans);
 716
 717         nft_deactivate_next(ctx->net, flowtable);
 718         nft_use_dec(&ctx->table->use);
 719
 720         return 0;
 721 }
 722
 723 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
 724 {
 725         int i;
 726
 727         for (i = track->regs[dreg].num_reg; i > 0; i--)
 728                 __nft_reg_track_cancel(track, dreg - i);
 729 }
 730
 731 static void __nft_reg_track_update(struct nft_regs_track *track,
 732                                    const struct nft_expr *expr,
 733                                    u8 dreg, u8 num_reg)
 734 {
 735         track->regs[dreg].selector = expr;
 736         track->regs[dreg].bitwise = NULL;
 737         track->regs[dreg].num_reg = num_reg;
 738 }
 739
 740 void nft_reg_track_update(struct nft_regs_track *track,
 741                           const struct nft_expr *expr, u8 dreg, u8 len)
 742 {
 743         unsigned int regcount;
 744         int i;
 745
 746         __nft_reg_track_clobber(track, dreg);
 747
 748         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 749         for (i = 0; i < regcount; i++, dreg++)
 750                 __nft_reg_track_update(track, expr, dreg, i);
 751 }
 752 EXPORT_SYMBOL_GPL(nft_reg_track_update);
 753
 754 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
 755 {
 756         unsigned int regcount;
 757         int i;
 758
 759         __nft_reg_track_clobber(track, dreg);
 760
 761         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 762         for (i = 0; i < regcount; i++, dreg++)
 763                 __nft_reg_track_cancel(track, dreg);
 764 }
 765 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
 766
 767 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
 768 {
 769         track->regs[dreg].selector = NULL;
 770         track->regs[dreg].bitwise = NULL;
 771         track->regs[dreg].num_reg = 0;
 772 }
 773 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
 774
 775 /*
 776  * Tables
 777  */
 778
 779 static struct nft_table *nft_table_lookup(const struct net *net,
 780                                           const struct nlattr *nla,
 781                                           u8 family, u8 genmask, u32 nlpid)
 782 {
 783         struct nftables_pernet *nft_net;
 784         struct nft_table *table;
 785
 786         if (nla == NULL)
 787                 return ERR_PTR(-EINVAL);
 788
 789         nft_net = nft_pernet(net);
 790         list_for_each_entry_rcu(table, &nft_net->tables, list,
 791                                 lockdep_is_held(&nft_net->commit_mutex)) {
 792                 if (!nla_strcmp(nla, table->name) &&
 793                     table->family == family &&
 794                     nft_active_genmask(table, genmask)) {
 795                         if (nft_table_has_owner(table) &&
 796                             nlpid && table->nlpid != nlpid)
 797                                 return ERR_PTR(-EPERM);
 798
 799                         return table;
 800                 }
 801         }
 802
 803         return ERR_PTR(-ENOENT);
 804 }
 805
 806 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 807                                                    const struct nlattr *nla,
 808                                                    int family, u8 genmask, u32 nlpid)
 809 {
 810         struct nftables_pernet *nft_net;
 811         struct nft_table *table;
 812
 813         nft_net = nft_pernet(net);
 814         list_for_each_entry(table, &nft_net->tables, list) {
 815                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 816                     table->family == family &&
 817                     nft_active_genmask(table, genmask)) {
 818                         if (nft_table_has_owner(table) &&
 819                             nlpid && table->nlpid != nlpid)
 820                                 return ERR_PTR(-EPERM);
 821
 822                         return table;
 823                 }
 824         }
 825
 826         return ERR_PTR(-ENOENT);
 827 }
 828
 829 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 830 {
 831         return ++table->hgenerator;
 832 }
 833
 834 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 835
 836 static const struct nft_chain_type *
 837 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 838 {
 839         if (family >= NFPROTO_NUMPROTO ||
 840             type >= NFT_CHAIN_T_MAX)
 841                 return NULL;
 842
 843         return chain_type[family][type];
 844 }
 845
 846 static const struct nft_chain_type *
 847 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 848 {
 849         const struct nft_chain_type *type;
 850         int i;
 851
 852         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 853                 type = __nft_chain_type_get(family, i);
 854                 if (!type)
 855                         continue;
 856                 if (!nla_strcmp(nla, type->name))
 857                         return type;
 858         }
 859         return NULL;
 860 }
 861
 862 struct nft_module_request {
 863         struct list_head        list;
 864         char                    module[MODULE_NAME_LEN];
 865         bool                    done;
 866 };
 867
 868 #ifdef CONFIG_MODULES
 869 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 870                                       ...)
 871 {
 872         char module_name[MODULE_NAME_LEN];
 873         struct nftables_pernet *nft_net;
 874         struct nft_module_request *req;
 875         va_list args;
 876         int ret;
 877
 878         va_start(args, fmt);
 879         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 880         va_end(args);
 881         if (ret >= MODULE_NAME_LEN)
 882                 return 0;
 883
 884         nft_net = nft_pernet(net);
 885         list_for_each_entry(req, &nft_net->module_list, list) {
 886                 if (!strcmp(req->module, module_name)) {
 887                         if (req->done)
 888                                 return 0;
 889
 890                         /* A request to load this module already exists. */
 891                         return -EAGAIN;
 892                 }
 893         }
 894
 895         req = kmalloc(sizeof(*req), GFP_KERNEL);
 896         if (!req)
 897                 return -ENOMEM;
 898
 899         req->done = false;
 900         strscpy(req->module, module_name, MODULE_NAME_LEN);
 901         list_add_tail(&req->list, &nft_net->module_list);
 902
 903         return -EAGAIN;
 904 }
 905 EXPORT_SYMBOL_GPL(nft_request_module);
 906 #endif
 907
 908 static void lockdep_nfnl_nft_mutex_not_held(void)
 909 {
 910 #ifdef CONFIG_PROVE_LOCKING
 911         if (debug_locks)
 912                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 913 #endif
 914 }
 915
 916 static const struct nft_chain_type *
 917 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 918                             u8 family, bool autoload)
 919 {
 920         const struct nft_chain_type *type;
 921
 922         type = __nf_tables_chain_type_lookup(nla, family);
 923         if (type != NULL)
 924                 return type;
 925
 926         lockdep_nfnl_nft_mutex_not_held();
 927 #ifdef CONFIG_MODULES
 928         if (autoload) {
 929                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 930                                        nla_len(nla),
 931                                        (const char *)nla_data(nla)) == -EAGAIN)
 932                         return ERR_PTR(-EAGAIN);
 933         }
 934 #endif
 935         return ERR_PTR(-ENOENT);
 936 }
 937
 938 static __be16 nft_base_seq(const struct net *net)
 939 {
 940         struct nftables_pernet *nft_net = nft_pernet(net);
 941
 942         return htons(nft_net->base_seq & 0xffff);
 943 }
 944
 945 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 946         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 947                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 948         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 949         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 950         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 951                                     .len = NFT_USERDATA_MAXLEN }
 952 };
 953
 954 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 955                                      u32 portid, u32 seq, int event, u32 flags,
 956                                      int family, const struct nft_table *table)
 957 {
 958         struct nlmsghdr *nlh;
 959
 960         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 961         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 962                            NFNETLINK_V0, nft_base_seq(net));
 963         if (!nlh)
 964                 goto nla_put_failure;
 965
 966         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 967             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 968             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 969                          NFTA_TABLE_PAD))
 970                 goto nla_put_failure;
 971
 972         if (event == NFT_MSG_DELTABLE) {
 973                 nlmsg_end(skb, nlh);
 974                 return 0;
 975         }
 976
 977         if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
 978                          htonl(table->flags & NFT_TABLE_F_MASK)))
 979                 goto nla_put_failure;
 980
 981         if (nft_table_has_owner(table) &&
 982             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 983                 goto nla_put_failure;
 984
 985         if (table->udata) {
 986                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 987                         goto nla_put_failure;
 988         }
 989
 990         nlmsg_end(skb, nlh);
 991         return 0;
 992
 993 nla_put_failure:
 994         nlmsg_trim(skb, nlh);
 995         return -1;
 996 }
 997
 998 struct nftnl_skb_parms {
 999         bool report;
1000 };
1001 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
1002
1003 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
1004                                struct list_head *notify_list)
1005 {
1006         NFT_CB(skb).report = report;
1007         list_add_tail(&skb->list, notify_list);
1008 }
1009
1010 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
1011 {
1012         struct nftables_pernet *nft_net;
1013         struct sk_buff *skb;
1014         u16 flags = 0;
1015         int err;
1016
1017         if (!ctx->report &&
1018             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1019                 return;
1020
1021         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1022         if (skb == NULL)
1023                 goto err;
1024
1025         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1026                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1027
1028         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
1029                                         event, flags, ctx->family, ctx->table);
1030         if (err < 0) {
1031                 kfree_skb(skb);
1032                 goto err;
1033         }
1034
1035         nft_net = nft_pernet(ctx->net);
1036         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1037         return;
1038 err:
1039         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1040 }
1041
1042 static int nf_tables_dump_tables(struct sk_buff *skb,
1043                                  struct netlink_callback *cb)
1044 {
1045         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1046         struct nftables_pernet *nft_net;
1047         const struct nft_table *table;
1048         unsigned int idx = 0, s_idx = cb->args[0];
1049         struct net *net = sock_net(skb->sk);
1050         int family = nfmsg->nfgen_family;
1051
1052         rcu_read_lock();
1053         nft_net = nft_pernet(net);
1054         cb->seq = READ_ONCE(nft_net->base_seq);
1055
1056         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1057                 if (family != NFPROTO_UNSPEC && family != table->family)
1058                         continue;
1059
1060                 if (idx < s_idx)
1061                         goto cont;
1062                 if (idx > s_idx)
1063                         memset(&cb->args[1], 0,
1064                                sizeof(cb->args) - sizeof(cb->args[0]));
1065                 if (!nft_is_active(net, table))
1066                         continue;
1067                 if (nf_tables_fill_table_info(skb, net,
1068                                               NETLINK_CB(cb->skb).portid,
1069                                               cb->nlh->nlmsg_seq,
1070                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
1071                                               table->family, table) < 0)
1072                         goto done;
1073
1074                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1075 cont:
1076                 idx++;
1077         }
1078 done:
1079         rcu_read_unlock();
1080         cb->args[0] = idx;
1081         return skb->len;
1082 }
1083
1084 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1085                                       const struct nlmsghdr *nlh,
1086                                       struct netlink_dump_control *c)
1087 {
1088         int err;
1089
1090         if (!try_module_get(THIS_MODULE))
1091                 return -EINVAL;
1092
1093         rcu_read_unlock();
1094         err = netlink_dump_start(nlsk, skb, nlh, c);
1095         rcu_read_lock();
1096         module_put(THIS_MODULE);
1097
1098         return err;
1099 }
1100
1101 /* called with rcu_read_lock held */
1102 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1103                               const struct nlattr * const nla[])
1104 {
1105         struct netlink_ext_ack *extack = info->extack;
1106         u8 genmask = nft_genmask_cur(info->net);
1107         u8 family = info->nfmsg->nfgen_family;
1108         const struct nft_table *table;
1109         struct net *net = info->net;
1110         struct sk_buff *skb2;
1111         int err;
1112
1113         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1114                 struct netlink_dump_control c = {
1115                         .dump = nf_tables_dump_tables,
1116                         .module = THIS_MODULE,
1117                 };
1118
1119                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1120         }
1121
1122         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1123         if (IS_ERR(table)) {
1124                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1125                 return PTR_ERR(table);
1126         }
1127
1128         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1129         if (!skb2)
1130                 return -ENOMEM;
1131
1132         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1133                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1134                                         0, family, table);
1135         if (err < 0)
1136                 goto err_fill_table_info;
1137
1138         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1139
1140 err_fill_table_info:
1141         kfree_skb(skb2);
1142         return err;
1143 }
1144
1145 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1146 {
1147         struct nft_chain *chain;
1148         u32 i = 0;
1149
1150         list_for_each_entry(chain, &table->chains, list) {
1151                 if (!nft_is_active_next(net, chain))
1152                         continue;
1153                 if (!nft_is_base_chain(chain))
1154                         continue;
1155
1156                 if (cnt && i++ == cnt)
1157                         break;
1158
1159                 nf_tables_unregister_hook(net, table, chain);
1160         }
1161 }
1162
1163 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1164 {
1165         struct nft_chain *chain;
1166         int err, i = 0;
1167
1168         list_for_each_entry(chain, &table->chains, list) {
1169                 if (!nft_is_active_next(net, chain))
1170                         continue;
1171                 if (!nft_is_base_chain(chain))
1172                         continue;
1173
1174                 err = nf_tables_register_hook(net, table, chain);
1175                 if (err < 0)
1176                         goto err_register_hooks;
1177
1178                 i++;
1179         }
1180         return 0;
1181
1182 err_register_hooks:
1183         if (i)
1184                 nft_table_disable(net, table, i);
1185         return err;
1186 }
1187
1188 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1189 {
1190         table->flags &= ~NFT_TABLE_F_DORMANT;
1191         nft_table_disable(net, table, 0);
1192         table->flags |= NFT_TABLE_F_DORMANT;
1193 }
1194
1195 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
1196 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
1197 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
1198 #define __NFT_TABLE_F_WAS_ORPHAN        (__NFT_TABLE_F_INTERNAL << 2)
1199 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
1200                                          __NFT_TABLE_F_WAS_AWAKEN | \
1201                                          __NFT_TABLE_F_WAS_ORPHAN)
1202
1203 static bool nft_table_pending_update(const struct nft_ctx *ctx)
1204 {
1205         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1206         struct nft_trans *trans;
1207
1208         if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
1209                 return true;
1210
1211         list_for_each_entry(trans, &nft_net->commit_list, list) {
1212                 if (trans->ctx.table == ctx->table &&
1213                     ((trans->msg_type == NFT_MSG_NEWCHAIN &&
1214                       nft_trans_chain_update(trans)) ||
1215                      (trans->msg_type == NFT_MSG_DELCHAIN &&
1216                       nft_is_base_chain(trans->ctx.chain))))
1217                         return true;
1218         }
1219
1220         return false;
1221 }
1222
1223 static int nf_tables_updtable(struct nft_ctx *ctx)
1224 {
1225         struct nft_trans *trans;
1226         u32 flags;
1227         int ret;
1228
1229         if (!ctx->nla[NFTA_TABLE_FLAGS])
1230                 return 0;
1231
1232         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1233         if (flags & ~NFT_TABLE_F_MASK)
1234                 return -EOPNOTSUPP;
1235
1236         if (flags == (ctx->table->flags & NFT_TABLE_F_MASK))
1237                 return 0;
1238
1239         if ((nft_table_has_owner(ctx->table) &&
1240              !(flags & NFT_TABLE_F_OWNER)) ||
1241             (flags & NFT_TABLE_F_OWNER &&
1242              !nft_table_is_orphan(ctx->table)))
1243                 return -EOPNOTSUPP;
1244
1245         if ((flags ^ ctx->table->flags) & NFT_TABLE_F_PERSIST)
1246                 return -EOPNOTSUPP;
1247
1248         /* No dormant off/on/off/on games in single transaction */
1249         if (nft_table_pending_update(ctx))
1250                 return -EINVAL;
1251
1252         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1253                                 sizeof(struct nft_trans_table));
1254         if (trans == NULL)
1255                 return -ENOMEM;
1256
1257         if ((flags & NFT_TABLE_F_DORMANT) &&
1258             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1259                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1260                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1261                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1262         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1263                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1264                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1265                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1266                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1267                         if (ret < 0)
1268                                 goto err_register_hooks;
1269
1270                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1271                 }
1272         }
1273
1274         if ((flags & NFT_TABLE_F_OWNER) &&
1275             !nft_table_has_owner(ctx->table)) {
1276                 ctx->table->nlpid = ctx->portid;
1277                 ctx->table->flags |= NFT_TABLE_F_OWNER |
1278                                      __NFT_TABLE_F_WAS_ORPHAN;
1279         }
1280
1281         nft_trans_table_update(trans) = true;
1282         nft_trans_commit_list_add_tail(ctx->net, trans);
1283
1284         return 0;
1285
1286 err_register_hooks:
1287         ctx->table->flags |= NFT_TABLE_F_DORMANT;
1288         nft_trans_destroy(trans);
1289         return ret;
1290 }
1291
1292 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1293 {
1294         const char *name = data;
1295
1296         return jhash(name, strlen(name), seed);
1297 }
1298
1299 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1300 {
1301         const struct nft_chain *chain = data;
1302
1303         return nft_chain_hash(chain->name, 0, seed);
1304 }
1305
1306 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1307                               const void *ptr)
1308 {
1309         const struct nft_chain *chain = ptr;
1310         const char *name = arg->key;
1311
1312         return strcmp(chain->name, name);
1313 }
1314
1315 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1316 {
1317         const struct nft_object_hash_key *k = data;
1318
1319         seed ^= hash_ptr(k->table, 32);
1320
1321         return jhash(k->name, strlen(k->name), seed);
1322 }
1323
1324 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1325 {
1326         const struct nft_object *obj = data;
1327
1328         return nft_objname_hash(&obj->key, 0, seed);
1329 }
1330
1331 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1332                                 const void *ptr)
1333 {
1334         const struct nft_object_hash_key *k = arg->key;
1335         const struct nft_object *obj = ptr;
1336
1337         if (obj->key.table != k->table)
1338                 return -1;
1339
1340         return strcmp(obj->key.name, k->name);
1341 }
1342
1343 static bool nft_supported_family(u8 family)
1344 {
1345         return false
1346 #ifdef CONFIG_NF_TABLES_INET
1347                 || family == NFPROTO_INET
1348 #endif
1349 #ifdef CONFIG_NF_TABLES_IPV4
1350                 || family == NFPROTO_IPV4
1351 #endif
1352 #ifdef CONFIG_NF_TABLES_ARP
1353                 || family == NFPROTO_ARP
1354 #endif
1355 #ifdef CONFIG_NF_TABLES_NETDEV
1356                 || family == NFPROTO_NETDEV
1357 #endif
1358 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1359                 || family == NFPROTO_BRIDGE
1360 #endif
1361 #ifdef CONFIG_NF_TABLES_IPV6
1362                 || family == NFPROTO_IPV6
1363 #endif
1364                 ;
1365 }
1366
1367 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1368                               const struct nlattr * const nla[])
1369 {
1370         struct nftables_pernet *nft_net = nft_pernet(info->net);
1371         struct netlink_ext_ack *extack = info->extack;
1372         u8 genmask = nft_genmask_next(info->net);
1373         u8 family = info->nfmsg->nfgen_family;
1374         struct net *net = info->net;
1375         const struct nlattr *attr;
1376         struct nft_table *table;
1377         struct nft_ctx ctx;
1378         u32 flags = 0;
1379         int err;
1380
1381         if (!nft_supported_family(family))
1382                 return -EOPNOTSUPP;
1383
1384         lockdep_assert_held(&nft_net->commit_mutex);
1385         attr = nla[NFTA_TABLE_NAME];
1386         table = nft_table_lookup(net, attr, family, genmask,
1387                                  NETLINK_CB(skb).portid);
1388         if (IS_ERR(table)) {
1389                 if (PTR_ERR(table) != -ENOENT)
1390                         return PTR_ERR(table);
1391         } else {
1392                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1393                         NL_SET_BAD_ATTR(extack, attr);
1394                         return -EEXIST;
1395                 }
1396                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1397                         return -EOPNOTSUPP;
1398
1399                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1400
1401                 return nf_tables_updtable(&ctx);
1402         }
1403
1404         if (nla[NFTA_TABLE_FLAGS]) {
1405                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1406                 if (flags & ~NFT_TABLE_F_MASK)
1407                         return -EOPNOTSUPP;
1408         }
1409
1410         err = -ENOMEM;
1411         table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1412         if (table == NULL)
1413                 goto err_kzalloc;
1414
1415         table->validate_state = nft_net->validate_state;
1416         table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1417         if (table->name == NULL)
1418                 goto err_strdup;
1419
1420         if (nla[NFTA_TABLE_USERDATA]) {
1421                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1422                 if (table->udata == NULL)
1423                         goto err_table_udata;
1424
1425                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1426         }
1427
1428         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1429         if (err)
1430                 goto err_chain_ht;
1431
1432         INIT_LIST_HEAD(&table->chains);
1433         INIT_LIST_HEAD(&table->sets);
1434         INIT_LIST_HEAD(&table->objects);
1435         INIT_LIST_HEAD(&table->flowtables);
1436         table->family = family;
1437         table->flags = flags;
1438         table->handle = ++nft_net->table_handle;
1439         if (table->flags & NFT_TABLE_F_OWNER)
1440                 table->nlpid = NETLINK_CB(skb).portid;
1441
1442         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1443         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1444         if (err < 0)
1445                 goto err_trans;
1446
1447         list_add_tail_rcu(&table->list, &nft_net->tables);
1448         return 0;
1449 err_trans:
1450         rhltable_destroy(&table->chains_ht);
1451 err_chain_ht:
1452         kfree(table->udata);
1453 err_table_udata:
1454         kfree(table->name);
1455 err_strdup:
1456         kfree(table);
1457 err_kzalloc:
1458         return err;
1459 }
1460
1461 static int nft_flush_table(struct nft_ctx *ctx)
1462 {
1463         struct nft_flowtable *flowtable, *nft;
1464         struct nft_chain *chain, *nc;
1465         struct nft_object *obj, *ne;
1466         struct nft_set *set, *ns;
1467         int err;
1468
1469         list_for_each_entry(chain, &ctx->table->chains, list) {
1470                 if (!nft_is_active_next(ctx->net, chain))
1471                         continue;
1472
1473                 if (nft_chain_binding(chain))
1474                         continue;
1475
1476                 ctx->chain = chain;
1477
1478                 err = nft_delrule_by_chain(ctx);
1479                 if (err < 0)
1480                         goto out;
1481         }
1482
1483         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1484                 if (!nft_is_active_next(ctx->net, set))
1485                         continue;
1486
1487                 if (nft_set_is_anonymous(set))
1488                         continue;
1489
1490                 err = nft_delset(ctx, set);
1491                 if (err < 0)
1492                         goto out;
1493         }
1494
1495         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1496                 if (!nft_is_active_next(ctx->net, flowtable))
1497                         continue;
1498
1499                 err = nft_delflowtable(ctx, flowtable);
1500                 if (err < 0)
1501                         goto out;
1502         }
1503
1504         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1505                 if (!nft_is_active_next(ctx->net, obj))
1506                         continue;
1507
1508                 err = nft_delobj(ctx, obj);
1509                 if (err < 0)
1510                         goto out;
1511         }
1512
1513         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1514                 if (!nft_is_active_next(ctx->net, chain))
1515                         continue;
1516
1517                 if (nft_chain_binding(chain))
1518                         continue;
1519
1520                 ctx->chain = chain;
1521
1522                 err = nft_delchain(ctx);
1523                 if (err < 0)
1524                         goto out;
1525         }
1526
1527         err = nft_deltable(ctx);
1528 out:
1529         return err;
1530 }
1531
1532 static int nft_flush(struct nft_ctx *ctx, int family)
1533 {
1534         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1535         const struct nlattr * const *nla = ctx->nla;
1536         struct nft_table *table, *nt;
1537         int err = 0;
1538
1539         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1540                 if (family != AF_UNSPEC && table->family != family)
1541                         continue;
1542
1543                 ctx->family = table->family;
1544
1545                 if (!nft_is_active_next(ctx->net, table))
1546                         continue;
1547
1548                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1549                         continue;
1550
1551                 if (nla[NFTA_TABLE_NAME] &&
1552                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1553                         continue;
1554
1555                 ctx->table = table;
1556
1557                 err = nft_flush_table(ctx);
1558                 if (err < 0)
1559                         goto out;
1560         }
1561 out:
1562         return err;
1563 }
1564
1565 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1566                               const struct nlattr * const nla[])
1567 {
1568         struct netlink_ext_ack *extack = info->extack;
1569         u8 genmask = nft_genmask_next(info->net);
1570         u8 family = info->nfmsg->nfgen_family;
1571         struct net *net = info->net;
1572         const struct nlattr *attr;
1573         struct nft_table *table;
1574         struct nft_ctx ctx;
1575
1576         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1577         if (family == AF_UNSPEC ||
1578             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1579                 return nft_flush(&ctx, family);
1580
1581         if (nla[NFTA_TABLE_HANDLE]) {
1582                 attr = nla[NFTA_TABLE_HANDLE];
1583                 table = nft_table_lookup_byhandle(net, attr, family, genmask,
1584                                                   NETLINK_CB(skb).portid);
1585         } else {
1586                 attr = nla[NFTA_TABLE_NAME];
1587                 table = nft_table_lookup(net, attr, family, genmask,
1588                                          NETLINK_CB(skb).portid);
1589         }
1590
1591         if (IS_ERR(table)) {
1592                 if (PTR_ERR(table) == -ENOENT &&
1593                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1594                         return 0;
1595
1596                 NL_SET_BAD_ATTR(extack, attr);
1597                 return PTR_ERR(table);
1598         }
1599
1600         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1601             table->use > 0)
1602                 return -EBUSY;
1603
1604         ctx.family = family;
1605         ctx.table = table;
1606
1607         return nft_flush_table(&ctx);
1608 }
1609
1610 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1611 {
1612         if (WARN_ON(ctx->table->use > 0))
1613                 return;
1614
1615         rhltable_destroy(&ctx->table->chains_ht);
1616         kfree(ctx->table->name);
1617         kfree(ctx->table->udata);
1618         kfree(ctx->table);
1619 }
1620
1621 void nft_register_chain_type(const struct nft_chain_type *ctype)
1622 {
1623         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1624         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1625                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1626                 return;
1627         }
1628         chain_type[ctype->family][ctype->type] = ctype;
1629         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1630 }
1631 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1632
1633 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1634 {
1635         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1636         chain_type[ctype->family][ctype->type] = NULL;
1637         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1638 }
1639 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1640
1641 /*
1642  * Chains
1643  */
1644
1645 static struct nft_chain *
1646 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1647 {
1648         struct nft_chain *chain;
1649
1650         list_for_each_entry(chain, &table->chains, list) {
1651                 if (chain->handle == handle &&
1652                     nft_active_genmask(chain, genmask))
1653                         return chain;
1654         }
1655
1656         return ERR_PTR(-ENOENT);
1657 }
1658
1659 static bool lockdep_commit_lock_is_held(const struct net *net)
1660 {
1661 #ifdef CONFIG_PROVE_LOCKING
1662         struct nftables_pernet *nft_net = nft_pernet(net);
1663
1664         return lockdep_is_held(&nft_net->commit_mutex);
1665 #else
1666         return true;
1667 #endif
1668 }
1669
1670 static struct nft_chain *nft_chain_lookup(struct net *net,
1671                                           struct nft_table *table,
1672                                           const struct nlattr *nla, u8 genmask)
1673 {
1674         char search[NFT_CHAIN_MAXNAMELEN + 1];
1675         struct rhlist_head *tmp, *list;
1676         struct nft_chain *chain;
1677
1678         if (nla == NULL)
1679                 return ERR_PTR(-EINVAL);
1680
1681         nla_strscpy(search, nla, sizeof(search));
1682
1683         WARN_ON(!rcu_read_lock_held() &&
1684                 !lockdep_commit_lock_is_held(net));
1685
1686         chain = ERR_PTR(-ENOENT);
1687         rcu_read_lock();
1688         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1689         if (!list)
1690                 goto out_unlock;
1691
1692         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1693                 if (nft_active_genmask(chain, genmask))
1694                         goto out_unlock;
1695         }
1696         chain = ERR_PTR(-ENOENT);
1697 out_unlock:
1698         rcu_read_unlock();
1699         return chain;
1700 }
1701
1702 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1703         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1704                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1705         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1706         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1707                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1708         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1709         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1710         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1711                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1712         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1713         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1714         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1715         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1716                                     .len = NFT_USERDATA_MAXLEN },
1717 };
1718
1719 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1720         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1721         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1722         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1723                                     .len = IFNAMSIZ - 1 },
1724 };
1725
1726 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1727 {
1728         struct nft_stats *cpu_stats, total;
1729         struct nlattr *nest;
1730         unsigned int seq;
1731         u64 pkts, bytes;
1732         int cpu;
1733
1734         if (!stats)
1735                 return 0;
1736
1737         memset(&total, 0, sizeof(total));
1738         for_each_possible_cpu(cpu) {
1739                 cpu_stats = per_cpu_ptr(stats, cpu);
1740                 do {
1741                         seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1742                         pkts = cpu_stats->pkts;
1743                         bytes = cpu_stats->bytes;
1744                 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1745                 total.pkts += pkts;
1746                 total.bytes += bytes;
1747         }
1748         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1749         if (nest == NULL)
1750                 goto nla_put_failure;
1751
1752         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1753                          NFTA_COUNTER_PAD) ||
1754             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1755                          NFTA_COUNTER_PAD))
1756                 goto nla_put_failure;
1757
1758         nla_nest_end(skb, nest);
1759         return 0;
1760
1761 nla_put_failure:
1762         return -ENOSPC;
1763 }
1764
1765 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1766                                    const struct nft_base_chain *basechain,
1767                                    const struct list_head *hook_list)
1768 {
1769         const struct nf_hook_ops *ops = &basechain->ops;
1770         struct nft_hook *hook, *first = NULL;
1771         struct nlattr *nest, *nest_devs;
1772         int n = 0;
1773
1774         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1775         if (nest == NULL)
1776                 goto nla_put_failure;
1777         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1778                 goto nla_put_failure;
1779         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1780                 goto nla_put_failure;
1781
1782         if (nft_base_chain_netdev(family, ops->hooknum)) {
1783                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1784                 if (!nest_devs)
1785                         goto nla_put_failure;
1786
1787                 if (!hook_list)
1788                         hook_list = &basechain->hook_list;
1789
1790                 list_for_each_entry(hook, hook_list, list) {
1791                         if (!first)
1792                                 first = hook;
1793
1794                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1795                                            hook->ops.dev->name))
1796                                 goto nla_put_failure;
1797                         n++;
1798                 }
1799                 nla_nest_end(skb, nest_devs);
1800
1801                 if (n == 1 &&
1802                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1803                         goto nla_put_failure;
1804         }
1805         nla_nest_end(skb, nest);
1806
1807         return 0;
1808 nla_put_failure:
1809         return -1;
1810 }
1811
1812 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1813                                      u32 portid, u32 seq, int event, u32 flags,
1814                                      int family, const struct nft_table *table,
1815                                      const struct nft_chain *chain,
1816                                      const struct list_head *hook_list)
1817 {
1818         struct nlmsghdr *nlh;
1819
1820         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1821         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1822                            NFNETLINK_V0, nft_base_seq(net));
1823         if (!nlh)
1824                 goto nla_put_failure;
1825
1826         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1827             nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1828             nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1829                          NFTA_CHAIN_PAD))
1830                 goto nla_put_failure;
1831
1832         if (event == NFT_MSG_DELCHAIN && !hook_list) {
1833                 nlmsg_end(skb, nlh);
1834                 return 0;
1835         }
1836
1837         if (nft_is_base_chain(chain)) {
1838                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1839                 struct nft_stats __percpu *stats;
1840
1841                 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1842                         goto nla_put_failure;
1843
1844                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1845                                  htonl(basechain->policy)))
1846                         goto nla_put_failure;
1847
1848                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1849                         goto nla_put_failure;
1850
1851                 stats = rcu_dereference_check(basechain->stats,
1852                                               lockdep_commit_lock_is_held(net));
1853                 if (nft_dump_stats(skb, stats))
1854                         goto nla_put_failure;
1855         }
1856
1857         if (chain->flags &&
1858             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1859                 goto nla_put_failure;
1860
1861         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1862                 goto nla_put_failure;
1863
1864         if (chain->udata &&
1865             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1866                 goto nla_put_failure;
1867
1868         nlmsg_end(skb, nlh);
1869         return 0;
1870
1871 nla_put_failure:
1872         nlmsg_trim(skb, nlh);
1873         return -1;
1874 }
1875
1876 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1877                                    const struct list_head *hook_list)
1878 {
1879         struct nftables_pernet *nft_net;
1880         struct sk_buff *skb;
1881         u16 flags = 0;
1882         int err;
1883
1884         if (!ctx->report &&
1885             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1886                 return;
1887
1888         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1889         if (skb == NULL)
1890                 goto err;
1891
1892         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1893                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1894
1895         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1896                                         event, flags, ctx->family, ctx->table,
1897                                         ctx->chain, hook_list);
1898         if (err < 0) {
1899                 kfree_skb(skb);
1900                 goto err;
1901         }
1902
1903         nft_net = nft_pernet(ctx->net);
1904         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1905         return;
1906 err:
1907         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1908 }
1909
1910 static int nf_tables_dump_chains(struct sk_buff *skb,
1911                                  struct netlink_callback *cb)
1912 {
1913         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1914         unsigned int idx = 0, s_idx = cb->args[0];
1915         struct net *net = sock_net(skb->sk);
1916         int family = nfmsg->nfgen_family;
1917         struct nftables_pernet *nft_net;
1918         const struct nft_table *table;
1919         const struct nft_chain *chain;
1920
1921         rcu_read_lock();
1922         nft_net = nft_pernet(net);
1923         cb->seq = READ_ONCE(nft_net->base_seq);
1924
1925         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1926                 if (family != NFPROTO_UNSPEC && family != table->family)
1927                         continue;
1928
1929                 list_for_each_entry_rcu(chain, &table->chains, list) {
1930                         if (idx < s_idx)
1931                                 goto cont;
1932                         if (idx > s_idx)
1933                                 memset(&cb->args[1], 0,
1934                                        sizeof(cb->args) - sizeof(cb->args[0]));
1935                         if (!nft_is_active(net, chain))
1936                                 continue;
1937                         if (nf_tables_fill_chain_info(skb, net,
1938                                                       NETLINK_CB(cb->skb).portid,
1939                                                       cb->nlh->nlmsg_seq,
1940                                                       NFT_MSG_NEWCHAIN,
1941                                                       NLM_F_MULTI,
1942                                                       table->family, table,
1943                                                       chain, NULL) < 0)
1944                                 goto done;
1945
1946                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1947 cont:
1948                         idx++;
1949                 }
1950         }
1951 done:
1952         rcu_read_unlock();
1953         cb->args[0] = idx;
1954         return skb->len;
1955 }
1956
1957 /* called with rcu_read_lock held */
1958 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1959                               const struct nlattr * const nla[])
1960 {
1961         struct netlink_ext_ack *extack = info->extack;
1962         u8 genmask = nft_genmask_cur(info->net);
1963         u8 family = info->nfmsg->nfgen_family;
1964         const struct nft_chain *chain;
1965         struct net *net = info->net;
1966         struct nft_table *table;
1967         struct sk_buff *skb2;
1968         int err;
1969
1970         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1971                 struct netlink_dump_control c = {
1972                         .dump = nf_tables_dump_chains,
1973                         .module = THIS_MODULE,
1974                 };
1975
1976                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1977         }
1978
1979         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1980         if (IS_ERR(table)) {
1981                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1982                 return PTR_ERR(table);
1983         }
1984
1985         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1986         if (IS_ERR(chain)) {
1987                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1988                 return PTR_ERR(chain);
1989         }
1990
1991         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1992         if (!skb2)
1993                 return -ENOMEM;
1994
1995         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1996                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1997                                         0, family, table, chain, NULL);
1998         if (err < 0)
1999                 goto err_fill_chain_info;
2000
2001         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
2002
2003 err_fill_chain_info:
2004         kfree_skb(skb2);
2005         return err;
2006 }
2007
2008 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
2009         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
2010         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
2011 };
2012
2013 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
2014 {
2015         struct nlattr *tb[NFTA_COUNTER_MAX+1];
2016         struct nft_stats __percpu *newstats;
2017         struct nft_stats *stats;
2018         int err;
2019
2020         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
2021                                           nft_counter_policy, NULL);
2022         if (err < 0)
2023                 return ERR_PTR(err);
2024
2025         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
2026                 return ERR_PTR(-EINVAL);
2027
2028         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
2029         if (newstats == NULL)
2030                 return ERR_PTR(-ENOMEM);
2031
2032         /* Restore old counters on this cpu, no problem. Per-cpu statistics
2033          * are not exposed to userspace.
2034          */
2035         preempt_disable();
2036         stats = this_cpu_ptr(newstats);
2037         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
2038         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
2039         preempt_enable();
2040
2041         return newstats;
2042 }
2043
2044 static void nft_chain_stats_replace(struct nft_trans *trans)
2045 {
2046         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
2047
2048         if (!nft_trans_chain_stats(trans))
2049                 return;
2050
2051         nft_trans_chain_stats(trans) =
2052                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
2053                                     lockdep_commit_lock_is_held(trans->ctx.net));
2054
2055         if (!nft_trans_chain_stats(trans))
2056                 static_branch_inc(&nft_counters_enabled);
2057 }
2058
2059 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
2060 {
2061         struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
2062         struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
2063
2064         if (g0 != g1)
2065                 kvfree(g1);
2066         kvfree(g0);
2067
2068         /* should be NULL either via abort or via successful commit */
2069         WARN_ON_ONCE(chain->blob_next);
2070         kvfree(chain->blob_next);
2071 }
2072
2073 void nf_tables_chain_destroy(struct nft_ctx *ctx)
2074 {
2075         struct nft_chain *chain = ctx->chain;
2076         struct nft_hook *hook, *next;
2077
2078         if (WARN_ON(chain->use > 0))
2079                 return;
2080
2081         /* no concurrent access possible anymore */
2082         nf_tables_chain_free_chain_rules(chain);
2083
2084         if (nft_is_base_chain(chain)) {
2085                 struct nft_base_chain *basechain = nft_base_chain(chain);
2086
2087                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2088                         list_for_each_entry_safe(hook, next,
2089                                                  &basechain->hook_list, list) {
2090                                 list_del_rcu(&hook->list);
2091                                 kfree_rcu(hook, rcu);
2092                         }
2093                 }
2094                 module_put(basechain->type->owner);
2095                 if (rcu_access_pointer(basechain->stats)) {
2096                         static_branch_dec(&nft_counters_enabled);
2097                         free_percpu(rcu_dereference_raw(basechain->stats));
2098                 }
2099                 kfree(chain->name);
2100                 kfree(chain->udata);
2101                 kfree(basechain);
2102         } else {
2103                 kfree(chain->name);
2104                 kfree(chain->udata);
2105                 kfree(chain);
2106         }
2107 }
2108
2109 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2110                                               const struct nlattr *attr)
2111 {
2112         struct net_device *dev;
2113         char ifname[IFNAMSIZ];
2114         struct nft_hook *hook;
2115         int err;
2116
2117         hook = kzalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2118         if (!hook) {
2119                 err = -ENOMEM;
2120                 goto err_hook_alloc;
2121         }
2122
2123         nla_strscpy(ifname, attr, IFNAMSIZ);
2124         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2125          * indirectly serializing all the other holders of the commit_mutex with
2126          * the rtnl_mutex.
2127          */
2128         dev = __dev_get_by_name(net, ifname);
2129         if (!dev) {
2130                 err = -ENOENT;
2131                 goto err_hook_dev;
2132         }
2133         hook->ops.dev = dev;
2134
2135         return hook;
2136
2137 err_hook_dev:
2138         kfree(hook);
2139 err_hook_alloc:
2140         return ERR_PTR(err);
2141 }
2142
2143 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2144                                            const struct nft_hook *this)
2145 {
2146         struct nft_hook *hook;
2147
2148         list_for_each_entry(hook, hook_list, list) {
2149                 if (this->ops.dev == hook->ops.dev)
2150                         return hook;
2151         }
2152
2153         return NULL;
2154 }
2155
2156 static int nf_tables_parse_netdev_hooks(struct net *net,
2157                                         const struct nlattr *attr,
2158                                         struct list_head *hook_list,
2159                                         struct netlink_ext_ack *extack)
2160 {
2161         struct nft_hook *hook, *next;
2162         const struct nlattr *tmp;
2163         int rem, n = 0, err;
2164
2165         nla_for_each_nested(tmp, attr, rem) {
2166                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2167                         err = -EINVAL;
2168                         goto err_hook;
2169                 }
2170
2171                 hook = nft_netdev_hook_alloc(net, tmp);
2172                 if (IS_ERR(hook)) {
2173                         NL_SET_BAD_ATTR(extack, tmp);
2174                         err = PTR_ERR(hook);
2175                         goto err_hook;
2176                 }
2177                 if (nft_hook_list_find(hook_list, hook)) {
2178                         NL_SET_BAD_ATTR(extack, tmp);
2179                         kfree(hook);
2180                         err = -EEXIST;
2181                         goto err_hook;
2182                 }
2183                 list_add_tail(&hook->list, hook_list);
2184                 n++;
2185
2186                 if (n == NFT_NETDEVICE_MAX) {
2187                         err = -EFBIG;
2188                         goto err_hook;
2189                 }
2190         }
2191
2192         return 0;
2193
2194 err_hook:
2195         list_for_each_entry_safe(hook, next, hook_list, list) {
2196                 list_del(&hook->list);
2197                 kfree(hook);
2198         }
2199         return err;
2200 }
2201
2202 struct nft_chain_hook {
2203         u32                             num;
2204         s32                             priority;
2205         const struct nft_chain_type     *type;
2206         struct list_head                list;
2207 };
2208
2209 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2210                                   struct list_head *hook_list,
2211                                   struct netlink_ext_ack *extack, u32 flags)
2212 {
2213         struct nft_hook *hook;
2214         int err;
2215
2216         if (tb[NFTA_HOOK_DEV]) {
2217                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2218                 if (IS_ERR(hook)) {
2219                         NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2220                         return PTR_ERR(hook);
2221                 }
2222
2223                 list_add_tail(&hook->list, hook_list);
2224         } else if (tb[NFTA_HOOK_DEVS]) {
2225                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2226                                                    hook_list, extack);
2227                 if (err < 0)
2228                         return err;
2229
2230         }
2231
2232         if (flags & NFT_CHAIN_HW_OFFLOAD &&
2233             list_empty(hook_list))
2234                 return -EINVAL;
2235
2236         return 0;
2237 }
2238
2239 static int nft_chain_parse_hook(struct net *net,
2240                                 struct nft_base_chain *basechain,
2241                                 const struct nlattr * const nla[],
2242                                 struct nft_chain_hook *hook, u8 family,
2243                                 u32 flags, struct netlink_ext_ack *extack)
2244 {
2245         struct nftables_pernet *nft_net = nft_pernet(net);
2246         struct nlattr *ha[NFTA_HOOK_MAX + 1];
2247         const struct nft_chain_type *type;
2248         int err;
2249
2250         lockdep_assert_held(&nft_net->commit_mutex);
2251         lockdep_nfnl_nft_mutex_not_held();
2252
2253         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2254                                           nla[NFTA_CHAIN_HOOK],
2255                                           nft_hook_policy, NULL);
2256         if (err < 0)
2257                 return err;
2258
2259         if (!basechain) {
2260                 if (!ha[NFTA_HOOK_HOOKNUM] ||
2261                     !ha[NFTA_HOOK_PRIORITY]) {
2262                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2263                         return -ENOENT;
2264                 }
2265
2266                 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2267                 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2268
2269                 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2270                 if (!type)
2271                         return -EOPNOTSUPP;
2272
2273                 if (nla[NFTA_CHAIN_TYPE]) {
2274                         type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2275                                                            family, true);
2276                         if (IS_ERR(type)) {
2277                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2278                                 return PTR_ERR(type);
2279                         }
2280                 }
2281                 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2282                         return -EOPNOTSUPP;
2283
2284                 if (type->type == NFT_CHAIN_T_NAT &&
2285                     hook->priority <= NF_IP_PRI_CONNTRACK)
2286                         return -EOPNOTSUPP;
2287         } else {
2288                 if (ha[NFTA_HOOK_HOOKNUM]) {
2289                         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2290                         if (hook->num != basechain->ops.hooknum)
2291                                 return -EOPNOTSUPP;
2292                 }
2293                 if (ha[NFTA_HOOK_PRIORITY]) {
2294                         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2295                         if (hook->priority != basechain->ops.priority)
2296                                 return -EOPNOTSUPP;
2297                 }
2298
2299                 if (nla[NFTA_CHAIN_TYPE]) {
2300                         type = __nf_tables_chain_type_lookup(nla[NFTA_CHAIN_TYPE],
2301                                                              family);
2302                         if (!type) {
2303                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2304                                 return -ENOENT;
2305                         }
2306                 } else {
2307                         type = basechain->type;
2308                 }
2309         }
2310
2311         if (!try_module_get(type->owner)) {
2312                 if (nla[NFTA_CHAIN_TYPE])
2313                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2314                 return -ENOENT;
2315         }
2316
2317         hook->type = type;
2318
2319         INIT_LIST_HEAD(&hook->list);
2320         if (nft_base_chain_netdev(family, hook->num)) {
2321                 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2322                 if (err < 0) {
2323                         module_put(type->owner);
2324                         return err;
2325                 }
2326         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2327                 module_put(type->owner);
2328                 return -EOPNOTSUPP;
2329         }
2330
2331         return 0;
2332 }
2333
2334 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2335 {
2336         struct nft_hook *h, *next;
2337
2338         list_for_each_entry_safe(h, next, &hook->list, list) {
2339                 list_del(&h->list);
2340                 kfree(h);
2341         }
2342         module_put(hook->type->owner);
2343 }
2344
2345 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2346 {
2347         struct nft_rule_dp_last *lrule;
2348
2349         BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2350
2351         lrule = (struct nft_rule_dp_last *)ptr;
2352         lrule->end.is_last = 1;
2353         lrule->chain = chain;
2354         /* blob size does not include the trailer rule */
2355 }
2356
2357 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2358                                                          unsigned int size)
2359 {
2360         struct nft_rule_blob *blob;
2361
2362         if (size > INT_MAX)
2363                 return NULL;
2364
2365         size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2366
2367         blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2368         if (!blob)
2369                 return NULL;
2370
2371         blob->size = 0;
2372         nft_last_rule(chain, blob->data);
2373
2374         return blob;
2375 }
2376
2377 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2378                                     const struct nft_chain_hook *hook,
2379                                     struct nft_chain *chain)
2380 {
2381         ops->pf                 = family;
2382         ops->hooknum            = hook->num;
2383         ops->priority           = hook->priority;
2384         ops->priv               = chain;
2385         ops->hook               = hook->type->hooks[ops->hooknum];
2386         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2387 }
2388
2389 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2390                               struct nft_chain_hook *hook, u32 flags)
2391 {
2392         struct nft_chain *chain;
2393         struct nft_hook *h;
2394
2395         basechain->type = hook->type;
2396         INIT_LIST_HEAD(&basechain->hook_list);
2397         chain = &basechain->chain;
2398
2399         if (nft_base_chain_netdev(family, hook->num)) {
2400                 list_splice_init(&hook->list, &basechain->hook_list);
2401                 list_for_each_entry(h, &basechain->hook_list, list)
2402                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2403         }
2404         nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2405
2406         chain->flags |= NFT_CHAIN_BASE | flags;
2407         basechain->policy = NF_ACCEPT;
2408         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2409             !nft_chain_offload_support(basechain)) {
2410                 list_splice_init(&basechain->hook_list, &hook->list);
2411                 return -EOPNOTSUPP;
2412         }
2413
2414         flow_block_init(&basechain->flow_block);
2415
2416         return 0;
2417 }
2418
2419 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2420 {
2421         int err;
2422
2423         err = rhltable_insert_key(&table->chains_ht, chain->name,
2424                                   &chain->rhlhead, nft_chain_ht_params);
2425         if (err)
2426                 return err;
2427
2428         list_add_tail_rcu(&chain->list, &table->chains);
2429
2430         return 0;
2431 }
2432
2433 static u64 chain_id;
2434
2435 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2436                               u8 policy, u32 flags,
2437                               struct netlink_ext_ack *extack)
2438 {
2439         const struct nlattr * const *nla = ctx->nla;
2440         struct nft_table *table = ctx->table;
2441         struct nft_base_chain *basechain;
2442         struct net *net = ctx->net;
2443         char name[NFT_NAME_MAXLEN];
2444         struct nft_rule_blob *blob;
2445         struct nft_trans *trans;
2446         struct nft_chain *chain;
2447         int err;
2448
2449         if (nla[NFTA_CHAIN_HOOK]) {
2450                 struct nft_stats __percpu *stats = NULL;
2451                 struct nft_chain_hook hook = {};
2452
2453                 if (table->flags & __NFT_TABLE_F_UPDATE)
2454                         return -EINVAL;
2455
2456                 if (flags & NFT_CHAIN_BINDING)
2457                         return -EOPNOTSUPP;
2458
2459                 err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2460                                            extack);
2461                 if (err < 0)
2462                         return err;
2463
2464                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2465                 if (basechain == NULL) {
2466                         nft_chain_release_hook(&hook);
2467                         return -ENOMEM;
2468                 }
2469                 chain = &basechain->chain;
2470
2471                 if (nla[NFTA_CHAIN_COUNTERS]) {
2472                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2473                         if (IS_ERR(stats)) {
2474                                 nft_chain_release_hook(&hook);
2475                                 kfree(basechain);
2476                                 return PTR_ERR(stats);
2477                         }
2478                         rcu_assign_pointer(basechain->stats, stats);
2479                 }
2480
2481                 err = nft_basechain_init(basechain, family, &hook, flags);
2482                 if (err < 0) {
2483                         nft_chain_release_hook(&hook);
2484                         kfree(basechain);
2485                         free_percpu(stats);
2486                         return err;
2487                 }
2488                 if (stats)
2489                         static_branch_inc(&nft_counters_enabled);
2490         } else {
2491                 if (flags & NFT_CHAIN_BASE)
2492                         return -EINVAL;
2493                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2494                         return -EOPNOTSUPP;
2495
2496                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2497                 if (chain == NULL)
2498                         return -ENOMEM;
2499
2500                 chain->flags = flags;
2501         }
2502         ctx->chain = chain;
2503
2504         INIT_LIST_HEAD(&chain->rules);
2505         chain->handle = nf_tables_alloc_handle(table);
2506         chain->table = table;
2507
2508         if (nla[NFTA_CHAIN_NAME]) {
2509                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2510         } else {
2511                 if (!(flags & NFT_CHAIN_BINDING)) {
2512                         err = -EINVAL;
2513                         goto err_destroy_chain;
2514                 }
2515
2516                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2517                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2518         }
2519
2520         if (!chain->name) {
2521                 err = -ENOMEM;
2522                 goto err_destroy_chain;
2523         }
2524
2525         if (nla[NFTA_CHAIN_USERDATA]) {
2526                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2527                 if (chain->udata == NULL) {
2528                         err = -ENOMEM;
2529                         goto err_destroy_chain;
2530                 }
2531                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2532         }
2533
2534         blob = nf_tables_chain_alloc_rules(chain, 0);
2535         if (!blob) {
2536                 err = -ENOMEM;
2537                 goto err_destroy_chain;
2538         }
2539
2540         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2541         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2542
2543         if (!nft_use_inc(&table->use)) {
2544                 err = -EMFILE;
2545                 goto err_destroy_chain;
2546         }
2547
2548         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2549         if (IS_ERR(trans)) {
2550                 err = PTR_ERR(trans);
2551                 goto err_trans;
2552         }
2553
2554         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2555         if (nft_is_base_chain(chain))
2556                 nft_trans_chain_policy(trans) = policy;
2557
2558         err = nft_chain_add(table, chain);
2559         if (err < 0)
2560                 goto err_chain_add;
2561
2562         /* This must be LAST to ensure no packets are walking over this chain. */
2563         err = nf_tables_register_hook(net, table, chain);
2564         if (err < 0)
2565                 goto err_register_hook;
2566
2567         return 0;
2568
2569 err_register_hook:
2570         nft_chain_del(chain);
2571 err_chain_add:
2572         nft_trans_destroy(trans);
2573 err_trans:
2574         nft_use_dec_restore(&table->use);
2575 err_destroy_chain:
2576         nf_tables_chain_destroy(ctx);
2577
2578         return err;
2579 }
2580
2581 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2582                               u32 flags, const struct nlattr *attr,
2583                               struct netlink_ext_ack *extack)
2584 {
2585         const struct nlattr * const *nla = ctx->nla;
2586         struct nft_base_chain *basechain = NULL;
2587         struct nft_table *table = ctx->table;
2588         struct nft_chain *chain = ctx->chain;
2589         struct nft_chain_hook hook = {};
2590         struct nft_stats *stats = NULL;
2591         struct nft_hook *h, *next;
2592         struct nf_hook_ops *ops;
2593         struct nft_trans *trans;
2594         bool unregister = false;
2595         int err;
2596
2597         if (chain->flags ^ flags)
2598                 return -EOPNOTSUPP;
2599
2600         INIT_LIST_HEAD(&hook.list);
2601
2602         if (nla[NFTA_CHAIN_HOOK]) {
2603                 if (!nft_is_base_chain(chain)) {
2604                         NL_SET_BAD_ATTR(extack, attr);
2605                         return -EEXIST;
2606                 }
2607
2608                 basechain = nft_base_chain(chain);
2609                 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2610                                            ctx->family, flags, extack);
2611                 if (err < 0)
2612                         return err;
2613
2614                 if (basechain->type != hook.type) {
2615                         nft_chain_release_hook(&hook);
2616                         NL_SET_BAD_ATTR(extack, attr);
2617                         return -EEXIST;
2618                 }
2619
2620                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2621                         list_for_each_entry_safe(h, next, &hook.list, list) {
2622                                 h->ops.pf       = basechain->ops.pf;
2623                                 h->ops.hooknum  = basechain->ops.hooknum;
2624                                 h->ops.priority = basechain->ops.priority;
2625                                 h->ops.priv     = basechain->ops.priv;
2626                                 h->ops.hook     = basechain->ops.hook;
2627
2628                                 if (nft_hook_list_find(&basechain->hook_list, h)) {
2629                                         list_del(&h->list);
2630                                         kfree(h);
2631                                 }
2632                         }
2633                 } else {
2634                         ops = &basechain->ops;
2635                         if (ops->hooknum != hook.num ||
2636                             ops->priority != hook.priority) {
2637                                 nft_chain_release_hook(&hook);
2638                                 NL_SET_BAD_ATTR(extack, attr);
2639                                 return -EEXIST;
2640                         }
2641                 }
2642         }
2643
2644         if (nla[NFTA_CHAIN_HANDLE] &&
2645             nla[NFTA_CHAIN_NAME]) {
2646                 struct nft_chain *chain2;
2647
2648                 chain2 = nft_chain_lookup(ctx->net, table,
2649                                           nla[NFTA_CHAIN_NAME], genmask);
2650                 if (!IS_ERR(chain2)) {
2651                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2652                         err = -EEXIST;
2653                         goto err_hooks;
2654                 }
2655         }
2656
2657         if (table->flags & __NFT_TABLE_F_UPDATE &&
2658             !list_empty(&hook.list)) {
2659                 NL_SET_BAD_ATTR(extack, attr);
2660                 err = -EOPNOTSUPP;
2661                 goto err_hooks;
2662         }
2663
2664         if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2665             nft_is_base_chain(chain) &&
2666             !list_empty(&hook.list)) {
2667                 basechain = nft_base_chain(chain);
2668                 ops = &basechain->ops;
2669
2670                 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2671                         err = nft_netdev_register_hooks(ctx->net, &hook.list);
2672                         if (err < 0)
2673                                 goto err_hooks;
2674                 }
2675         }
2676
2677         unregister = true;
2678
2679         if (nla[NFTA_CHAIN_COUNTERS]) {
2680                 if (!nft_is_base_chain(chain)) {
2681                         err = -EOPNOTSUPP;
2682                         goto err_hooks;
2683                 }
2684
2685                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2686                 if (IS_ERR(stats)) {
2687                         err = PTR_ERR(stats);
2688                         goto err_hooks;
2689                 }
2690         }
2691
2692         err = -ENOMEM;
2693         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2694                                 sizeof(struct nft_trans_chain));
2695         if (trans == NULL)
2696                 goto err_trans;
2697
2698         nft_trans_chain_stats(trans) = stats;
2699         nft_trans_chain_update(trans) = true;
2700
2701         if (nla[NFTA_CHAIN_POLICY])
2702                 nft_trans_chain_policy(trans) = policy;
2703         else
2704                 nft_trans_chain_policy(trans) = -1;
2705
2706         if (nla[NFTA_CHAIN_HANDLE] &&
2707             nla[NFTA_CHAIN_NAME]) {
2708                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2709                 struct nft_trans *tmp;
2710                 char *name;
2711
2712                 err = -ENOMEM;
2713                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2714                 if (!name)
2715                         goto err_trans;
2716
2717                 err = -EEXIST;
2718                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2719                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2720                             tmp->ctx.table == table &&
2721                             nft_trans_chain_update(tmp) &&
2722                             nft_trans_chain_name(tmp) &&
2723                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2724                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2725                                 kfree(name);
2726                                 goto err_trans;
2727                         }
2728                 }
2729
2730                 nft_trans_chain_name(trans) = name;
2731         }
2732
2733         nft_trans_basechain(trans) = basechain;
2734         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2735         list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2736         if (nla[NFTA_CHAIN_HOOK])
2737                 module_put(hook.type->owner);
2738
2739         nft_trans_commit_list_add_tail(ctx->net, trans);
2740
2741         return 0;
2742
2743 err_trans:
2744         free_percpu(stats);
2745         kfree(trans);
2746 err_hooks:
2747         if (nla[NFTA_CHAIN_HOOK]) {
2748                 list_for_each_entry_safe(h, next, &hook.list, list) {
2749                         if (unregister)
2750                                 nf_unregister_net_hook(ctx->net, &h->ops);
2751                         list_del(&h->list);
2752                         kfree_rcu(h, rcu);
2753                 }
2754                 module_put(hook.type->owner);
2755         }
2756
2757         return err;
2758 }
2759
2760 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2761                                                const struct nft_table *table,
2762                                                const struct nlattr *nla, u8 genmask)
2763 {
2764         struct nftables_pernet *nft_net = nft_pernet(net);
2765         u32 id = ntohl(nla_get_be32(nla));
2766         struct nft_trans *trans;
2767
2768         list_for_each_entry(trans, &nft_net->commit_list, list) {
2769                 struct nft_chain *chain = trans->ctx.chain;
2770
2771                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2772                     chain->table == table &&
2773                     id == nft_trans_chain_id(trans) &&
2774                     nft_active_genmask(chain, genmask))
2775                         return chain;
2776         }
2777         return ERR_PTR(-ENOENT);
2778 }
2779
2780 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2781                               const struct nlattr * const nla[])
2782 {
2783         struct nftables_pernet *nft_net = nft_pernet(info->net);
2784         struct netlink_ext_ack *extack = info->extack;
2785         u8 genmask = nft_genmask_next(info->net);
2786         u8 family = info->nfmsg->nfgen_family;
2787         struct nft_chain *chain = NULL;
2788         struct net *net = info->net;
2789         const struct nlattr *attr;
2790         struct nft_table *table;
2791         u8 policy = NF_ACCEPT;
2792         struct nft_ctx ctx;
2793         u64 handle = 0;
2794         u32 flags = 0;
2795
2796         lockdep_assert_held(&nft_net->commit_mutex);
2797
2798         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2799                                  NETLINK_CB(skb).portid);
2800         if (IS_ERR(table)) {
2801                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2802                 return PTR_ERR(table);
2803         }
2804
2805         chain = NULL;
2806         attr = nla[NFTA_CHAIN_NAME];
2807
2808         if (nla[NFTA_CHAIN_HANDLE]) {
2809                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2810                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2811                 if (IS_ERR(chain)) {
2812                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2813                         return PTR_ERR(chain);
2814                 }
2815                 attr = nla[NFTA_CHAIN_HANDLE];
2816         } else if (nla[NFTA_CHAIN_NAME]) {
2817                 chain = nft_chain_lookup(net, table, attr, genmask);
2818                 if (IS_ERR(chain)) {
2819                         if (PTR_ERR(chain) != -ENOENT) {
2820                                 NL_SET_BAD_ATTR(extack, attr);
2821                                 return PTR_ERR(chain);
2822                         }
2823                         chain = NULL;
2824                 }
2825         } else if (!nla[NFTA_CHAIN_ID]) {
2826                 return -EINVAL;
2827         }
2828
2829         if (nla[NFTA_CHAIN_POLICY]) {
2830                 if (chain != NULL &&
2831                     !nft_is_base_chain(chain)) {
2832                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2833                         return -EOPNOTSUPP;
2834                 }
2835
2836                 if (chain == NULL &&
2837                     nla[NFTA_CHAIN_HOOK] == NULL) {
2838                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2839                         return -EOPNOTSUPP;
2840                 }
2841
2842                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2843                 switch (policy) {
2844                 case NF_DROP:
2845                 case NF_ACCEPT:
2846                         break;
2847                 default:
2848                         return -EINVAL;
2849                 }
2850         }
2851
2852         if (nla[NFTA_CHAIN_FLAGS])
2853                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2854         else if (chain)
2855                 flags = chain->flags;
2856
2857         if (flags & ~NFT_CHAIN_FLAGS)
2858                 return -EOPNOTSUPP;
2859
2860         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2861
2862         if (chain != NULL) {
2863                 if (chain->flags & NFT_CHAIN_BINDING)
2864                         return -EINVAL;
2865
2866                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2867                         NL_SET_BAD_ATTR(extack, attr);
2868                         return -EEXIST;
2869                 }
2870                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2871                         return -EOPNOTSUPP;
2872
2873                 flags |= chain->flags & NFT_CHAIN_BASE;
2874                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2875                                           extack);
2876         }
2877
2878         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2879 }
2880
2881 static int nft_delchain_hook(struct nft_ctx *ctx,
2882                              struct nft_base_chain *basechain,
2883                              struct netlink_ext_ack *extack)
2884 {
2885         const struct nft_chain *chain = &basechain->chain;
2886         const struct nlattr * const *nla = ctx->nla;
2887         struct nft_chain_hook chain_hook = {};
2888         struct nft_hook *this, *hook;
2889         LIST_HEAD(chain_del_list);
2890         struct nft_trans *trans;
2891         int err;
2892
2893         if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
2894                 return -EOPNOTSUPP;
2895
2896         err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2897                                    ctx->family, chain->flags, extack);
2898         if (err < 0)
2899                 return err;
2900
2901         list_for_each_entry(this, &chain_hook.list, list) {
2902                 hook = nft_hook_list_find(&basechain->hook_list, this);
2903                 if (!hook) {
2904                         err = -ENOENT;
2905                         goto err_chain_del_hook;
2906                 }
2907                 list_move(&hook->list, &chain_del_list);
2908         }
2909
2910         trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2911                                 sizeof(struct nft_trans_chain));
2912         if (!trans) {
2913                 err = -ENOMEM;
2914                 goto err_chain_del_hook;
2915         }
2916
2917         nft_trans_basechain(trans) = basechain;
2918         nft_trans_chain_update(trans) = true;
2919         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2920         list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2921         nft_chain_release_hook(&chain_hook);
2922
2923         nft_trans_commit_list_add_tail(ctx->net, trans);
2924
2925         return 0;
2926
2927 err_chain_del_hook:
2928         list_splice(&chain_del_list, &basechain->hook_list);
2929         nft_chain_release_hook(&chain_hook);
2930
2931         return err;
2932 }
2933
2934 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2935                               const struct nlattr * const nla[])
2936 {
2937         struct netlink_ext_ack *extack = info->extack;
2938         u8 genmask = nft_genmask_next(info->net);
2939         u8 family = info->nfmsg->nfgen_family;
2940         struct net *net = info->net;
2941         const struct nlattr *attr;
2942         struct nft_table *table;
2943         struct nft_chain *chain;
2944         struct nft_rule *rule;
2945         struct nft_ctx ctx;
2946         u64 handle;
2947         u32 use;
2948         int err;
2949
2950         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2951                                  NETLINK_CB(skb).portid);
2952         if (IS_ERR(table)) {
2953                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2954                 return PTR_ERR(table);
2955         }
2956
2957         if (nla[NFTA_CHAIN_HANDLE]) {
2958                 attr = nla[NFTA_CHAIN_HANDLE];
2959                 handle = be64_to_cpu(nla_get_be64(attr));
2960                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2961         } else {
2962                 attr = nla[NFTA_CHAIN_NAME];
2963                 chain = nft_chain_lookup(net, table, attr, genmask);
2964         }
2965         if (IS_ERR(chain)) {
2966                 if (PTR_ERR(chain) == -ENOENT &&
2967                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2968                         return 0;
2969
2970                 NL_SET_BAD_ATTR(extack, attr);
2971                 return PTR_ERR(chain);
2972         }
2973
2974         if (nft_chain_binding(chain))
2975                 return -EOPNOTSUPP;
2976
2977         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2978
2979         if (nla[NFTA_CHAIN_HOOK]) {
2980                 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN ||
2981                     chain->flags & NFT_CHAIN_HW_OFFLOAD)
2982                         return -EOPNOTSUPP;
2983
2984                 if (nft_is_base_chain(chain)) {
2985                         struct nft_base_chain *basechain = nft_base_chain(chain);
2986
2987                         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2988                                 return nft_delchain_hook(&ctx, basechain, extack);
2989                 }
2990         }
2991
2992         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2993             chain->use > 0)
2994                 return -EBUSY;
2995
2996         use = chain->use;
2997         list_for_each_entry(rule, &chain->rules, list) {
2998                 if (!nft_is_active_next(net, rule))
2999                         continue;
3000                 use--;
3001
3002                 err = nft_delrule(&ctx, rule);
3003                 if (err < 0)
3004                         return err;
3005         }
3006
3007         /* There are rules and elements that are still holding references to us,
3008          * we cannot do a recursive removal in this case.
3009          */
3010         if (use > 0) {
3011                 NL_SET_BAD_ATTR(extack, attr);
3012                 return -EBUSY;
3013         }
3014
3015         return nft_delchain(&ctx);
3016 }
3017
3018 /*
3019  * Expressions
3020  */
3021
3022 /**
3023  *      nft_register_expr - register nf_tables expr type
3024  *      @type: expr type
3025  *
3026  *      Registers the expr type for use with nf_tables. Returns zero on
3027  *      success or a negative errno code otherwise.
3028  */
3029 int nft_register_expr(struct nft_expr_type *type)
3030 {
3031         if (WARN_ON_ONCE(type->maxattr > NFT_EXPR_MAXATTR))
3032                 return -ENOMEM;
3033
3034         nfnl_lock(NFNL_SUBSYS_NFTABLES);
3035         if (type->family == NFPROTO_UNSPEC)
3036                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
3037         else
3038                 list_add_rcu(&type->list, &nf_tables_expressions);
3039         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3040         return 0;
3041 }
3042 EXPORT_SYMBOL_GPL(nft_register_expr);
3043
3044 /**
3045  *      nft_unregister_expr - unregister nf_tables expr type
3046  *      @type: expr type
3047  *
3048  *      Unregisters the expr typefor use with nf_tables.
3049  */
3050 void nft_unregister_expr(struct nft_expr_type *type)
3051 {
3052         nfnl_lock(NFNL_SUBSYS_NFTABLES);
3053         list_del_rcu(&type->list);
3054         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3055 }
3056 EXPORT_SYMBOL_GPL(nft_unregister_expr);
3057
3058 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
3059                                                        struct nlattr *nla)
3060 {
3061         const struct nft_expr_type *type, *candidate = NULL;
3062
3063         list_for_each_entry(type, &nf_tables_expressions, list) {
3064                 if (!nla_strcmp(nla, type->name)) {
3065                         if (!type->family && !candidate)
3066                                 candidate = type;
3067                         else if (type->family == family)
3068                                 candidate = type;
3069                 }
3070         }
3071         return candidate;
3072 }
3073
3074 #ifdef CONFIG_MODULES
3075 static int nft_expr_type_request_module(struct net *net, u8 family,
3076                                         struct nlattr *nla)
3077 {
3078         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3079                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3080                 return -EAGAIN;
3081
3082         return 0;
3083 }
3084 #endif
3085
3086 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3087                                                      u8 family,
3088                                                      struct nlattr *nla)
3089 {
3090         const struct nft_expr_type *type;
3091
3092         if (nla == NULL)
3093                 return ERR_PTR(-EINVAL);
3094
3095         type = __nft_expr_type_get(family, nla);
3096         if (type != NULL && try_module_get(type->owner))
3097                 return type;
3098
3099         lockdep_nfnl_nft_mutex_not_held();
3100 #ifdef CONFIG_MODULES
3101         if (type == NULL) {
3102                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3103                         return ERR_PTR(-EAGAIN);
3104
3105                 if (nft_request_module(net, "nft-expr-%.*s",
3106                                        nla_len(nla),
3107                                        (char *)nla_data(nla)) == -EAGAIN)
3108                         return ERR_PTR(-EAGAIN);
3109         }
3110 #endif
3111         return ERR_PTR(-ENOENT);
3112 }
3113
3114 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3115         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
3116                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
3117         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
3118 };
3119
3120 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3121                                     const struct nft_expr *expr, bool reset)
3122 {
3123         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3124                 goto nla_put_failure;
3125
3126         if (expr->ops->dump) {
3127                 struct nlattr *data = nla_nest_start_noflag(skb,
3128                                                             NFTA_EXPR_DATA);
3129                 if (data == NULL)
3130                         goto nla_put_failure;
3131                 if (expr->ops->dump(skb, expr, reset) < 0)
3132                         goto nla_put_failure;
3133                 nla_nest_end(skb, data);
3134         }
3135
3136         return skb->len;
3137
3138 nla_put_failure:
3139         return -1;
3140 };
3141
3142 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3143                   const struct nft_expr *expr, bool reset)
3144 {
3145         struct nlattr *nest;
3146
3147         nest = nla_nest_start_noflag(skb, attr);
3148         if (!nest)
3149                 goto nla_put_failure;
3150         if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3151                 goto nla_put_failure;
3152         nla_nest_end(skb, nest);
3153         return 0;
3154
3155 nla_put_failure:
3156         return -1;
3157 }
3158
3159 struct nft_expr_info {
3160         const struct nft_expr_ops       *ops;
3161         const struct nlattr             *attr;
3162         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
3163 };
3164
3165 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3166                                 const struct nlattr *nla,
3167                                 struct nft_expr_info *info)
3168 {
3169         const struct nft_expr_type *type;
3170         const struct nft_expr_ops *ops;
3171         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3172         int err;
3173
3174         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3175                                           nft_expr_policy, NULL);
3176         if (err < 0)
3177                 return err;
3178
3179         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3180         if (IS_ERR(type))
3181                 return PTR_ERR(type);
3182
3183         if (tb[NFTA_EXPR_DATA]) {
3184                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3185                                                   tb[NFTA_EXPR_DATA],
3186                                                   type->policy, NULL);
3187                 if (err < 0)
3188                         goto err1;
3189         } else
3190                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3191
3192         if (type->select_ops != NULL) {
3193                 ops = type->select_ops(ctx,
3194                                        (const struct nlattr * const *)info->tb);
3195                 if (IS_ERR(ops)) {
3196                         err = PTR_ERR(ops);
3197 #ifdef CONFIG_MODULES
3198                         if (err == -EAGAIN)
3199                                 if (nft_expr_type_request_module(ctx->net,
3200                                                                  ctx->family,
3201                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
3202                                         err = -ENOENT;
3203 #endif
3204                         goto err1;
3205                 }
3206         } else
3207                 ops = type->ops;
3208
3209         info->attr = nla;
3210         info->ops = ops;
3211
3212         return 0;
3213
3214 err1:
3215         module_put(type->owner);
3216         return err;
3217 }
3218
3219 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3220                          struct nft_expr_info *info)
3221 {
3222         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3223         const struct nft_expr_type *type;
3224         int err;
3225
3226         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3227                                           nft_expr_policy, NULL);
3228         if (err < 0)
3229                 return err;
3230
3231         if (!tb[NFTA_EXPR_DATA] || !tb[NFTA_EXPR_NAME])
3232                 return -EINVAL;
3233
3234         type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3235         if (!type)
3236                 return -ENOENT;
3237
3238         if (!type->inner_ops)
3239                 return -EOPNOTSUPP;
3240
3241         err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3242                                           tb[NFTA_EXPR_DATA],
3243                                           type->policy, NULL);
3244         if (err < 0)
3245                 goto err_nla_parse;
3246
3247         info->attr = nla;
3248         info->ops = type->inner_ops;
3249
3250         return 0;
3251
3252 err_nla_parse:
3253         return err;
3254 }
3255
3256 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3257                              const struct nft_expr_info *expr_info,
3258                              struct nft_expr *expr)
3259 {
3260         const struct nft_expr_ops *ops = expr_info->ops;
3261         int err;
3262
3263         expr->ops = ops;
3264         if (ops->init) {
3265                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3266                 if (err < 0)
3267                         goto err1;
3268         }
3269
3270         return 0;
3271 err1:
3272         expr->ops = NULL;
3273         return err;
3274 }
3275
3276 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3277                                    struct nft_expr *expr)
3278 {
3279         const struct nft_expr_type *type = expr->ops->type;
3280
3281         if (expr->ops->destroy)
3282                 expr->ops->destroy(ctx, expr);
3283         module_put(type->owner);
3284 }
3285
3286 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3287                                       const struct nlattr *nla)
3288 {
3289         struct nft_expr_info expr_info;
3290         struct nft_expr *expr;
3291         struct module *owner;
3292         int err;
3293
3294         err = nf_tables_expr_parse(ctx, nla, &expr_info);
3295         if (err < 0)
3296                 goto err_expr_parse;
3297
3298         err = -EOPNOTSUPP;
3299         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3300                 goto err_expr_stateful;
3301
3302         err = -ENOMEM;
3303         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3304         if (expr == NULL)
3305                 goto err_expr_stateful;
3306
3307         err = nf_tables_newexpr(ctx, &expr_info, expr);
3308         if (err < 0)
3309                 goto err_expr_new;
3310
3311         return expr;
3312 err_expr_new:
3313         kfree(expr);
3314 err_expr_stateful:
3315         owner = expr_info.ops->type->owner;
3316         if (expr_info.ops->type->release_ops)
3317                 expr_info.ops->type->release_ops(expr_info.ops);
3318
3319         module_put(owner);
3320 err_expr_parse:
3321         return ERR_PTR(err);
3322 }
3323
3324 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3325 {
3326         int err;
3327
3328         if (WARN_ON_ONCE(!src->ops->clone))
3329                 return -EINVAL;
3330
3331         dst->ops = src->ops;
3332         err = src->ops->clone(dst, src);
3333         if (err < 0)
3334                 return err;
3335
3336         __module_get(src->ops->type->owner);
3337
3338         return 0;
3339 }
3340
3341 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3342 {
3343         nf_tables_expr_destroy(ctx, expr);
3344         kfree(expr);
3345 }
3346
3347 /*
3348  * Rules
3349  */
3350
3351 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3352                                           u64 handle)
3353 {
3354         struct nft_rule *rule;
3355
3356         // FIXME: this sucks
3357         list_for_each_entry_rcu(rule, &chain->rules, list) {
3358                 if (handle == rule->handle)
3359                         return rule;
3360         }
3361
3362         return ERR_PTR(-ENOENT);
3363 }
3364
3365 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3366                                         const struct nlattr *nla)
3367 {
3368         if (nla == NULL)
3369                 return ERR_PTR(-EINVAL);
3370
3371         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3372 }
3373
3374 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3375         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
3376                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
3377         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
3378                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
3379         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
3380         [NFTA_RULE_EXPRESSIONS] = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
3381         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
3382         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
3383         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
3384                                     .len = NFT_USERDATA_MAXLEN },
3385         [NFTA_RULE_ID]          = { .type = NLA_U32 },
3386         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3387         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
3388 };
3389
3390 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3391                                     u32 portid, u32 seq, int event,
3392                                     u32 flags, int family,
3393                                     const struct nft_table *table,
3394                                     const struct nft_chain *chain,
3395                                     const struct nft_rule *rule, u64 handle,
3396                                     bool reset)
3397 {
3398         struct nlmsghdr *nlh;
3399         const struct nft_expr *expr, *next;
3400         struct nlattr *list;
3401         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3402
3403         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3404                            nft_base_seq(net));
3405         if (!nlh)
3406                 goto nla_put_failure;
3407
3408         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3409                 goto nla_put_failure;
3410         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3411                 goto nla_put_failure;
3412         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3413                          NFTA_RULE_PAD))
3414                 goto nla_put_failure;
3415
3416         if (event != NFT_MSG_DELRULE && handle) {
3417                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3418                                  NFTA_RULE_PAD))
3419                         goto nla_put_failure;
3420         }
3421
3422         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3423                 nft_flow_rule_stats(chain, rule);
3424
3425         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3426         if (list == NULL)
3427                 goto nla_put_failure;
3428         nft_rule_for_each_expr(expr, next, rule) {
3429                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3430                         goto nla_put_failure;
3431         }
3432         nla_nest_end(skb, list);
3433
3434         if (rule->udata) {
3435                 struct nft_userdata *udata = nft_userdata(rule);
3436                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3437                             udata->data) < 0)
3438                         goto nla_put_failure;
3439         }
3440
3441         nlmsg_end(skb, nlh);
3442         return 0;
3443
3444 nla_put_failure:
3445         nlmsg_trim(skb, nlh);
3446         return -1;
3447 }
3448
3449 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3450                                   const struct nft_rule *rule, int event)
3451 {
3452         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3453         const struct nft_rule *prule;
3454         struct sk_buff *skb;
3455         u64 handle = 0;
3456         u16 flags = 0;
3457         int err;
3458
3459         if (!ctx->report &&
3460             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3461                 return;
3462
3463         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3464         if (skb == NULL)
3465                 goto err;
3466
3467         if (event == NFT_MSG_NEWRULE &&
3468             !list_is_first(&rule->list, &ctx->chain->rules) &&
3469             !list_is_last(&rule->list, &ctx->chain->rules)) {
3470                 prule = list_prev_entry(rule, list);
3471                 handle = prule->handle;
3472         }
3473         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3474                 flags |= NLM_F_APPEND;
3475         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3476                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3477
3478         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3479                                        event, flags, ctx->family, ctx->table,
3480                                        ctx->chain, rule, handle, false);
3481         if (err < 0) {
3482                 kfree_skb(skb);
3483                 goto err;
3484         }
3485
3486         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3487         return;
3488 err:
3489         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3490 }
3491
3492 static void audit_log_rule_reset(const struct nft_table *table,
3493                                  unsigned int base_seq,
3494                                  unsigned int nentries)
3495 {
3496         char *buf = kasprintf(GFP_ATOMIC, "%s:%u",
3497                               table->name, base_seq);
3498
3499         audit_log_nfcfg(buf, table->family, nentries,
3500                         AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3501         kfree(buf);
3502 }
3503
3504 struct nft_rule_dump_ctx {
3505         unsigned int s_idx;
3506         char *table;
3507         char *chain;
3508         bool reset;
3509 };
3510
3511 static int __nf_tables_dump_rules(struct sk_buff *skb,
3512                                   unsigned int *idx,
3513                                   struct netlink_callback *cb,
3514                                   const struct nft_table *table,
3515                                   const struct nft_chain *chain)
3516 {
3517         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3518         struct net *net = sock_net(skb->sk);
3519         const struct nft_rule *rule, *prule;
3520         unsigned int entries = 0;
3521         int ret = 0;
3522         u64 handle;
3523
3524         prule = NULL;
3525         list_for_each_entry_rcu(rule, &chain->rules, list) {
3526                 if (!nft_is_active(net, rule))
3527                         goto cont_skip;
3528                 if (*idx < ctx->s_idx)
3529                         goto cont;
3530                 if (prule)
3531                         handle = prule->handle;
3532                 else
3533                         handle = 0;
3534
3535                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3536                                         cb->nlh->nlmsg_seq,
3537                                         NFT_MSG_NEWRULE,
3538                                         NLM_F_MULTI | NLM_F_APPEND,
3539                                         table->family,
3540                                         table, chain, rule, handle, ctx->reset) < 0) {
3541                         ret = 1;
3542                         break;
3543                 }
3544                 entries++;
3545                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3546 cont:
3547                 prule = rule;
3548 cont_skip:
3549                 (*idx)++;
3550         }
3551
3552         if (ctx->reset && entries)
3553                 audit_log_rule_reset(table, cb->seq, entries);
3554
3555         return ret;
3556 }
3557
3558 static int nf_tables_dump_rules(struct sk_buff *skb,
3559                                 struct netlink_callback *cb)
3560 {
3561         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3562         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3563         struct nft_table *table;
3564         const struct nft_chain *chain;
3565         unsigned int idx = 0;
3566         struct net *net = sock_net(skb->sk);
3567         int family = nfmsg->nfgen_family;
3568         struct nftables_pernet *nft_net;
3569
3570         rcu_read_lock();
3571         nft_net = nft_pernet(net);
3572         cb->seq = READ_ONCE(nft_net->base_seq);
3573
3574         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3575                 if (family != NFPROTO_UNSPEC && family != table->family)
3576                         continue;
3577
3578                 if (ctx->table && strcmp(ctx->table, table->name) != 0)
3579                         continue;
3580
3581                 if (ctx->table && ctx->chain) {
3582                         struct rhlist_head *list, *tmp;
3583
3584                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3585                                                nft_chain_ht_params);
3586                         if (!list)
3587                                 goto done;
3588
3589                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3590                                 if (!nft_is_active(net, chain))
3591                                         continue;
3592                                 __nf_tables_dump_rules(skb, &idx,
3593                                                        cb, table, chain);
3594                                 break;
3595                         }
3596                         goto done;
3597                 }
3598
3599                 list_for_each_entry_rcu(chain, &table->chains, list) {
3600                         if (__nf_tables_dump_rules(skb, &idx,
3601                                                    cb, table, chain))
3602                                 goto done;
3603                 }
3604
3605                 if (ctx->table)
3606                         break;
3607         }
3608 done:
3609         rcu_read_unlock();
3610
3611         ctx->s_idx = idx;
3612         return skb->len;
3613 }
3614
3615 static int nf_tables_dumpreset_rules(struct sk_buff *skb,
3616                                      struct netlink_callback *cb)
3617 {
3618         struct nftables_pernet *nft_net = nft_pernet(sock_net(skb->sk));
3619         int ret;
3620
3621         /* Mutex is held is to prevent that two concurrent dump-and-reset calls
3622          * do not underrun counters and quotas. The commit_mutex is used for
3623          * the lack a better lock, this is not transaction path.
3624          */
3625         mutex_lock(&nft_net->commit_mutex);
3626         ret = nf_tables_dump_rules(skb, cb);
3627         mutex_unlock(&nft_net->commit_mutex);
3628
3629         return ret;
3630 }
3631
3632 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3633 {
3634         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3635         const struct nlattr * const *nla = cb->data;
3636
3637         BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
3638
3639         if (nla[NFTA_RULE_TABLE]) {
3640                 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE], GFP_ATOMIC);
3641                 if (!ctx->table)
3642                         return -ENOMEM;
3643         }
3644         if (nla[NFTA_RULE_CHAIN]) {
3645                 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN], GFP_ATOMIC);
3646                 if (!ctx->chain) {
3647                         kfree(ctx->table);
3648                         return -ENOMEM;
3649                 }
3650         }
3651         return 0;
3652 }
3653
3654 static int nf_tables_dumpreset_rules_start(struct netlink_callback *cb)
3655 {
3656         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3657
3658         ctx->reset = true;
3659
3660         return nf_tables_dump_rules_start(cb);
3661 }
3662
3663 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3664 {
3665         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3666
3667         kfree(ctx->table);
3668         kfree(ctx->chain);
3669         return 0;
3670 }
3671
3672 /* called with rcu_read_lock held */
3673 static struct sk_buff *
3674 nf_tables_getrule_single(u32 portid, const struct nfnl_info *info,
3675                          const struct nlattr * const nla[], bool reset)
3676 {
3677         struct netlink_ext_ack *extack = info->extack;
3678         u8 genmask = nft_genmask_cur(info->net);
3679         u8 family = info->nfmsg->nfgen_family;
3680         const struct nft_chain *chain;
3681         const struct nft_rule *rule;
3682         struct net *net = info->net;
3683         struct nft_table *table;
3684         struct sk_buff *skb2;
3685         int err;
3686
3687         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3688         if (IS_ERR(table)) {
3689                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3690                 return ERR_CAST(table);
3691         }
3692
3693         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3694         if (IS_ERR(chain)) {
3695                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3696                 return ERR_CAST(chain);
3697         }
3698
3699         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3700         if (IS_ERR(rule)) {
3701                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3702                 return ERR_CAST(rule);
3703         }
3704
3705         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3706         if (!skb2)
3707                 return ERR_PTR(-ENOMEM);
3708
3709         err = nf_tables_fill_rule_info(skb2, net, portid,
3710                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3711                                        family, table, chain, rule, 0, reset);
3712         if (err < 0) {
3713                 kfree_skb(skb2);
3714                 return ERR_PTR(err);
3715         }
3716
3717         return skb2;
3718 }
3719
3720 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3721                              const struct nlattr * const nla[])
3722 {
3723         u32 portid = NETLINK_CB(skb).portid;
3724         struct net *net = info->net;
3725         struct sk_buff *skb2;
3726
3727         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3728                 struct netlink_dump_control c = {
3729                         .start= nf_tables_dump_rules_start,
3730                         .dump = nf_tables_dump_rules,
3731                         .done = nf_tables_dump_rules_done,
3732                         .module = THIS_MODULE,
3733                         .data = (void *)nla,
3734                 };
3735
3736                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3737         }
3738
3739         skb2 = nf_tables_getrule_single(portid, info, nla, false);
3740         if (IS_ERR(skb2))
3741                 return PTR_ERR(skb2);
3742
3743         return nfnetlink_unicast(skb2, net, portid);
3744 }
3745
3746 static int nf_tables_getrule_reset(struct sk_buff *skb,
3747                                    const struct nfnl_info *info,
3748                                    const struct nlattr * const nla[])
3749 {
3750         struct nftables_pernet *nft_net = nft_pernet(info->net);
3751         u32 portid = NETLINK_CB(skb).portid;
3752         struct net *net = info->net;
3753         struct sk_buff *skb2;
3754         char *buf;
3755
3756         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3757                 struct netlink_dump_control c = {
3758                         .start= nf_tables_dumpreset_rules_start,
3759                         .dump = nf_tables_dumpreset_rules,
3760                         .done = nf_tables_dump_rules_done,
3761                         .module = THIS_MODULE,
3762                         .data = (void *)nla,
3763                 };
3764
3765                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3766         }
3767
3768         if (!try_module_get(THIS_MODULE))
3769                 return -EINVAL;
3770         rcu_read_unlock();
3771         mutex_lock(&nft_net->commit_mutex);
3772         skb2 = nf_tables_getrule_single(portid, info, nla, true);
3773         mutex_unlock(&nft_net->commit_mutex);
3774         rcu_read_lock();
3775         module_put(THIS_MODULE);
3776
3777         if (IS_ERR(skb2))
3778                 return PTR_ERR(skb2);
3779
3780         buf = kasprintf(GFP_ATOMIC, "%.*s:%u",
3781                         nla_len(nla[NFTA_RULE_TABLE]),
3782                         (char *)nla_data(nla[NFTA_RULE_TABLE]),
3783                         nft_net->base_seq);
3784         audit_log_nfcfg(buf, info->nfmsg->nfgen_family, 1,
3785                         AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3786         kfree(buf);
3787
3788         return nfnetlink_unicast(skb2, net, portid);
3789 }
3790
3791 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3792 {
3793         struct nft_expr *expr, *next;
3794
3795         /*
3796          * Careful: some expressions might not be initialized in case this
3797          * is called on error from nf_tables_newrule().
3798          */
3799         expr = nft_expr_first(rule);
3800         while (nft_expr_more(rule, expr)) {
3801                 next = nft_expr_next(expr);
3802                 nf_tables_expr_destroy(ctx, expr);
3803                 expr = next;
3804         }
3805         kfree(rule);
3806 }
3807
3808 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3809 {
3810         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3811         nf_tables_rule_destroy(ctx, rule);
3812 }
3813
3814 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3815 {
3816         struct nft_expr *expr, *last;
3817         const struct nft_data *data;
3818         struct nft_rule *rule;
3819         int err;
3820
3821         if (ctx->level == NFT_JUMP_STACK_SIZE)
3822                 return -EMLINK;
3823
3824         list_for_each_entry(rule, &chain->rules, list) {
3825                 if (fatal_signal_pending(current))
3826                         return -EINTR;
3827
3828                 if (!nft_is_active_next(ctx->net, rule))
3829                         continue;
3830
3831                 nft_rule_for_each_expr(expr, last, rule) {
3832                         if (!expr->ops->validate)
3833                                 continue;
3834
3835                         err = expr->ops->validate(ctx, expr, &data);
3836                         if (err < 0)
3837                                 return err;
3838                 }
3839         }
3840
3841         return 0;
3842 }
3843 EXPORT_SYMBOL_GPL(nft_chain_validate);
3844
3845 static int nft_table_validate(struct net *net, const struct nft_table *table)
3846 {
3847         struct nft_chain *chain;
3848         struct nft_ctx ctx = {
3849                 .net    = net,
3850                 .family = table->family,
3851         };
3852         int err;
3853
3854         list_for_each_entry(chain, &table->chains, list) {
3855                 if (!nft_is_base_chain(chain))
3856                         continue;
3857
3858                 ctx.chain = chain;
3859                 err = nft_chain_validate(&ctx, chain);
3860                 if (err < 0)
3861                         return err;
3862
3863                 cond_resched();
3864         }
3865
3866         return 0;
3867 }
3868
3869 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3870                          const struct nft_set_iter *iter,
3871                          struct nft_elem_priv *elem_priv)
3872 {
3873         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
3874         struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3875         const struct nft_data *data;
3876         int err;
3877
3878         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3879             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3880                 return 0;
3881
3882         data = nft_set_ext_data(ext);
3883         switch (data->verdict.code) {
3884         case NFT_JUMP:
3885         case NFT_GOTO:
3886                 pctx->level++;
3887                 err = nft_chain_validate(ctx, data->verdict.chain);
3888                 if (err < 0)
3889                         return err;
3890                 pctx->level--;
3891                 break;
3892         default:
3893                 break;
3894         }
3895
3896         return 0;
3897 }
3898
3899 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3900 {
3901         u8 genmask = nft_genmask_next(ctx->net);
3902         struct nft_set_elem_catchall *catchall;
3903         struct nft_set_ext *ext;
3904         int ret = 0;
3905
3906         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3907                 ext = nft_set_elem_ext(set, catchall->elem);
3908                 if (!nft_set_elem_active(ext, genmask))
3909                         continue;
3910
3911                 ret = nft_setelem_validate(ctx, set, NULL, catchall->elem);
3912                 if (ret < 0)
3913                         return ret;
3914         }
3915
3916         return ret;
3917 }
3918
3919 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3920                                              const struct nft_chain *chain,
3921                                              const struct nlattr *nla);
3922
3923 #define NFT_RULE_MAXEXPRS       128
3924
3925 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3926                              const struct nlattr * const nla[])
3927 {
3928         struct nftables_pernet *nft_net = nft_pernet(info->net);
3929         struct netlink_ext_ack *extack = info->extack;
3930         unsigned int size, i, n, ulen = 0, usize = 0;
3931         u8 genmask = nft_genmask_next(info->net);
3932         struct nft_rule *rule, *old_rule = NULL;
3933         struct nft_expr_info *expr_info = NULL;
3934         u8 family = info->nfmsg->nfgen_family;
3935         struct nft_flow_rule *flow = NULL;
3936         struct net *net = info->net;
3937         struct nft_userdata *udata;
3938         struct nft_table *table;
3939         struct nft_chain *chain;
3940         struct nft_trans *trans;
3941         u64 handle, pos_handle;
3942         struct nft_expr *expr;
3943         struct nft_ctx ctx;
3944         struct nlattr *tmp;
3945         int err, rem;
3946
3947         lockdep_assert_held(&nft_net->commit_mutex);
3948
3949         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3950                                  NETLINK_CB(skb).portid);
3951         if (IS_ERR(table)) {
3952                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3953                 return PTR_ERR(table);
3954         }
3955
3956         if (nla[NFTA_RULE_CHAIN]) {
3957                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3958                                          genmask);
3959                 if (IS_ERR(chain)) {
3960                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3961                         return PTR_ERR(chain);
3962                 }
3963
3964         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3965                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3966                                               genmask);
3967                 if (IS_ERR(chain)) {
3968                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3969                         return PTR_ERR(chain);
3970                 }
3971         } else {
3972                 return -EINVAL;
3973         }
3974
3975         if (nft_chain_is_bound(chain))
3976                 return -EOPNOTSUPP;
3977
3978         if (nla[NFTA_RULE_HANDLE]) {
3979                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3980                 rule = __nft_rule_lookup(chain, handle);
3981                 if (IS_ERR(rule)) {
3982                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3983                         return PTR_ERR(rule);
3984                 }
3985
3986                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3987                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3988                         return -EEXIST;
3989                 }
3990                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3991                         old_rule = rule;
3992                 else
3993                         return -EOPNOTSUPP;
3994         } else {
3995                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3996                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3997                         return -EINVAL;
3998                 handle = nf_tables_alloc_handle(table);
3999
4000                 if (nla[NFTA_RULE_POSITION]) {
4001                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
4002                         old_rule = __nft_rule_lookup(chain, pos_handle);
4003                         if (IS_ERR(old_rule)) {
4004                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
4005                                 return PTR_ERR(old_rule);
4006                         }
4007                 } else if (nla[NFTA_RULE_POSITION_ID]) {
4008                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
4009                         if (IS_ERR(old_rule)) {
4010                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
4011                                 return PTR_ERR(old_rule);
4012                         }
4013                 }
4014         }
4015
4016         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4017
4018         n = 0;
4019         size = 0;
4020         if (nla[NFTA_RULE_EXPRESSIONS]) {
4021                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
4022                                            sizeof(struct nft_expr_info),
4023                                            GFP_KERNEL);
4024                 if (!expr_info)
4025                         return -ENOMEM;
4026
4027                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
4028                         err = -EINVAL;
4029                         if (nla_type(tmp) != NFTA_LIST_ELEM)
4030                                 goto err_release_expr;
4031                         if (n == NFT_RULE_MAXEXPRS)
4032                                 goto err_release_expr;
4033                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
4034                         if (err < 0) {
4035                                 NL_SET_BAD_ATTR(extack, tmp);
4036                                 goto err_release_expr;
4037                         }
4038                         size += expr_info[n].ops->size;
4039                         n++;
4040                 }
4041         }
4042         /* Check for overflow of dlen field */
4043         err = -EFBIG;
4044         if (size >= 1 << 12)
4045                 goto err_release_expr;
4046
4047         if (nla[NFTA_RULE_USERDATA]) {
4048                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
4049                 if (ulen > 0)
4050                         usize = sizeof(struct nft_userdata) + ulen;
4051         }
4052
4053         err = -ENOMEM;
4054         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
4055         if (rule == NULL)
4056                 goto err_release_expr;
4057
4058         nft_activate_next(net, rule);
4059
4060         rule->handle = handle;
4061         rule->dlen   = size;
4062         rule->udata  = ulen ? 1 : 0;
4063
4064         if (ulen) {
4065                 udata = nft_userdata(rule);
4066                 udata->len = ulen - 1;
4067                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
4068         }
4069
4070         expr = nft_expr_first(rule);
4071         for (i = 0; i < n; i++) {
4072                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
4073                 if (err < 0) {
4074                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
4075                         goto err_release_rule;
4076                 }
4077
4078                 if (expr_info[i].ops->validate)
4079                         nft_validate_state_update(table, NFT_VALIDATE_NEED);
4080
4081                 expr_info[i].ops = NULL;
4082                 expr = nft_expr_next(expr);
4083         }
4084
4085         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
4086                 flow = nft_flow_rule_create(net, rule);
4087                 if (IS_ERR(flow)) {
4088                         err = PTR_ERR(flow);
4089                         goto err_release_rule;
4090                 }
4091         }
4092
4093         if (!nft_use_inc(&chain->use)) {
4094                 err = -EMFILE;
4095                 goto err_release_rule;
4096         }
4097
4098         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
4099                 if (nft_chain_binding(chain)) {
4100                         err = -EOPNOTSUPP;
4101                         goto err_destroy_flow_rule;
4102                 }
4103
4104                 err = nft_delrule(&ctx, old_rule);
4105                 if (err < 0)
4106                         goto err_destroy_flow_rule;
4107
4108                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4109                 if (trans == NULL) {
4110                         err = -ENOMEM;
4111                         goto err_destroy_flow_rule;
4112                 }
4113                 list_add_tail_rcu(&rule->list, &old_rule->list);
4114         } else {
4115                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4116                 if (!trans) {
4117                         err = -ENOMEM;
4118                         goto err_destroy_flow_rule;
4119                 }
4120
4121                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
4122                         if (old_rule)
4123                                 list_add_rcu(&rule->list, &old_rule->list);
4124                         else
4125                                 list_add_tail_rcu(&rule->list, &chain->rules);
4126                  } else {
4127                         if (old_rule)
4128                                 list_add_tail_rcu(&rule->list, &old_rule->list);
4129                         else
4130                                 list_add_rcu(&rule->list, &chain->rules);
4131                 }
4132         }
4133         kvfree(expr_info);
4134
4135         if (flow)
4136                 nft_trans_flow_rule(trans) = flow;
4137
4138         if (table->validate_state == NFT_VALIDATE_DO)
4139                 return nft_table_validate(net, table);
4140
4141         return 0;
4142
4143 err_destroy_flow_rule:
4144         nft_use_dec_restore(&chain->use);
4145         if (flow)
4146                 nft_flow_rule_destroy(flow);
4147 err_release_rule:
4148         nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
4149         nf_tables_rule_destroy(&ctx, rule);
4150 err_release_expr:
4151         for (i = 0; i < n; i++) {
4152                 if (expr_info[i].ops) {
4153                         module_put(expr_info[i].ops->type->owner);
4154                         if (expr_info[i].ops->type->release_ops)
4155                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
4156                 }
4157         }
4158         kvfree(expr_info);
4159
4160         return err;
4161 }
4162
4163 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4164                                              const struct nft_chain *chain,
4165                                              const struct nlattr *nla)
4166 {
4167         struct nftables_pernet *nft_net = nft_pernet(net);
4168         u32 id = ntohl(nla_get_be32(nla));
4169         struct nft_trans *trans;
4170
4171         list_for_each_entry(trans, &nft_net->commit_list, list) {
4172                 if (trans->msg_type == NFT_MSG_NEWRULE &&
4173                     trans->ctx.chain == chain &&
4174                     id == nft_trans_rule_id(trans))
4175                         return nft_trans_rule(trans);
4176         }
4177         return ERR_PTR(-ENOENT);
4178 }
4179
4180 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4181                              const struct nlattr * const nla[])
4182 {
4183         struct netlink_ext_ack *extack = info->extack;
4184         u8 genmask = nft_genmask_next(info->net);
4185         u8 family = info->nfmsg->nfgen_family;
4186         struct nft_chain *chain = NULL;
4187         struct net *net = info->net;
4188         struct nft_table *table;
4189         struct nft_rule *rule;
4190         struct nft_ctx ctx;
4191         int err = 0;
4192
4193         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4194                                  NETLINK_CB(skb).portid);
4195         if (IS_ERR(table)) {
4196                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4197                 return PTR_ERR(table);
4198         }
4199
4200         if (nla[NFTA_RULE_CHAIN]) {
4201                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4202                                          genmask);
4203                 if (IS_ERR(chain)) {
4204                         if (PTR_ERR(chain) == -ENOENT &&
4205                             NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4206                                 return 0;
4207
4208                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4209                         return PTR_ERR(chain);
4210                 }
4211                 if (nft_chain_binding(chain))
4212                         return -EOPNOTSUPP;
4213         }
4214
4215         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4216
4217         if (chain) {
4218                 if (nla[NFTA_RULE_HANDLE]) {
4219                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4220                         if (IS_ERR(rule)) {
4221                                 if (PTR_ERR(rule) == -ENOENT &&
4222                                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4223                                         return 0;
4224
4225                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4226                                 return PTR_ERR(rule);
4227                         }
4228
4229                         err = nft_delrule(&ctx, rule);
4230                 } else if (nla[NFTA_RULE_ID]) {
4231                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4232                         if (IS_ERR(rule)) {
4233                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4234                                 return PTR_ERR(rule);
4235                         }
4236
4237                         err = nft_delrule(&ctx, rule);
4238                 } else {
4239                         err = nft_delrule_by_chain(&ctx);
4240                 }
4241         } else {
4242                 list_for_each_entry(chain, &table->chains, list) {
4243                         if (!nft_is_active_next(net, chain))
4244                                 continue;
4245                         if (nft_chain_binding(chain))
4246                                 continue;
4247
4248                         ctx.chain = chain;
4249                         err = nft_delrule_by_chain(&ctx);
4250                         if (err < 0)
4251                                 break;
4252                 }
4253         }
4254
4255         return err;
4256 }
4257
4258 /*
4259  * Sets
4260  */
4261 static const struct nft_set_type *nft_set_types[] = {
4262         &nft_set_hash_fast_type,
4263         &nft_set_hash_type,
4264         &nft_set_rhash_type,
4265         &nft_set_bitmap_type,
4266         &nft_set_rbtree_type,
4267 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4268         &nft_set_pipapo_avx2_type,
4269 #endif
4270         &nft_set_pipapo_type,
4271 };
4272
4273 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
4274                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4275                                  NFT_SET_EVAL)
4276
4277 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4278 {
4279         return (flags & type->features) == (flags & NFT_SET_FEATURES);
4280 }
4281
4282 /*
4283  * Select a set implementation based on the data characteristics and the
4284  * given policy. The total memory use might not be known if no size is
4285  * given, in that case the amount of memory per element is used.
4286  */
4287 static const struct nft_set_ops *
4288 nft_select_set_ops(const struct nft_ctx *ctx, u32 flags,
4289                    const struct nft_set_desc *desc)
4290 {
4291         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4292         const struct nft_set_ops *ops, *bops;
4293         struct nft_set_estimate est, best;
4294         const struct nft_set_type *type;
4295         int i;
4296
4297         lockdep_assert_held(&nft_net->commit_mutex);
4298         lockdep_nfnl_nft_mutex_not_held();
4299
4300         bops        = NULL;
4301         best.size   = ~0;
4302         best.lookup = ~0;
4303         best.space  = ~0;
4304
4305         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4306                 type = nft_set_types[i];
4307                 ops = &type->ops;
4308
4309                 if (!nft_set_ops_candidate(type, flags))
4310                         continue;
4311                 if (!ops->estimate(desc, flags, &est))
4312                         continue;
4313
4314                 switch (desc->policy) {
4315                 case NFT_SET_POL_PERFORMANCE:
4316                         if (est.lookup < best.lookup)
4317                                 break;
4318                         if (est.lookup == best.lookup &&
4319                             est.space < best.space)
4320                                 break;
4321                         continue;
4322                 case NFT_SET_POL_MEMORY:
4323                         if (!desc->size) {
4324                                 if (est.space < best.space)
4325                                         break;
4326                                 if (est.space == best.space &&
4327                                     est.lookup < best.lookup)
4328                                         break;
4329                         } else if (est.size < best.size || !bops) {
4330                                 break;
4331                         }
4332                         continue;
4333                 default:
4334                         break;
4335                 }
4336
4337                 bops = ops;
4338                 best = est;
4339         }
4340
4341         if (bops != NULL)
4342                 return bops;
4343
4344         return ERR_PTR(-EOPNOTSUPP);
4345 }
4346
4347 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4348         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
4349                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4350         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
4351                                             .len = NFT_SET_MAXNAMELEN - 1 },
4352         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
4353         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
4354         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
4355         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
4356         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
4357         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
4358         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
4359         [NFTA_SET_ID]                   = { .type = NLA_U32 },
4360         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
4361         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
4362         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
4363                                             .len  = NFT_USERDATA_MAXLEN },
4364         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
4365         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
4366         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
4367         [NFTA_SET_EXPRESSIONS]          = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
4368 };
4369
4370 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4371         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4372 };
4373
4374 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4375         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
4376         [NFTA_SET_DESC_CONCAT]          = NLA_POLICY_NESTED_ARRAY(nft_concat_policy),
4377 };
4378
4379 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4380                                       const struct nlattr *nla, u8 genmask)
4381 {
4382         struct nft_set *set;
4383
4384         if (nla == NULL)
4385                 return ERR_PTR(-EINVAL);
4386
4387         list_for_each_entry_rcu(set, &table->sets, list) {
4388                 if (!nla_strcmp(nla, set->name) &&
4389                     nft_active_genmask(set, genmask))
4390                         return set;
4391         }
4392         return ERR_PTR(-ENOENT);
4393 }
4394
4395 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4396                                                const struct nlattr *nla,
4397                                                u8 genmask)
4398 {
4399         struct nft_set *set;
4400
4401         list_for_each_entry(set, &table->sets, list) {
4402                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4403                     nft_active_genmask(set, genmask))
4404                         return set;
4405         }
4406         return ERR_PTR(-ENOENT);
4407 }
4408
4409 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4410                                            const struct nft_table *table,
4411                                            const struct nlattr *nla, u8 genmask)
4412 {
4413         struct nftables_pernet *nft_net = nft_pernet(net);
4414         u32 id = ntohl(nla_get_be32(nla));
4415         struct nft_trans *trans;
4416
4417         list_for_each_entry(trans, &nft_net->commit_list, list) {
4418                 if (trans->msg_type == NFT_MSG_NEWSET) {
4419                         struct nft_set *set = nft_trans_set(trans);
4420
4421                         if (id == nft_trans_set_id(trans) &&
4422                             set->table == table &&
4423                             nft_active_genmask(set, genmask))
4424                                 return set;
4425                 }
4426         }
4427         return ERR_PTR(-ENOENT);
4428 }
4429
4430 struct nft_set *nft_set_lookup_global(const struct net *net,
4431                                       const struct nft_table *table,
4432                                       const struct nlattr *nla_set_name,
4433                                       const struct nlattr *nla_set_id,
4434                                       u8 genmask)
4435 {
4436         struct nft_set *set;
4437
4438         set = nft_set_lookup(table, nla_set_name, genmask);
4439         if (IS_ERR(set)) {
4440                 if (!nla_set_id)
4441                         return set;
4442
4443                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4444         }
4445         return set;
4446 }
4447 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4448
4449 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4450                                     const char *name)
4451 {
4452         const struct nft_set *i;
4453         const char *p;
4454         unsigned long *inuse;
4455         unsigned int n = 0, min = 0;
4456
4457         p = strchr(name, '%');
4458         if (p != NULL) {
4459                 if (p[1] != 'd' || strchr(p + 2, '%'))
4460                         return -EINVAL;
4461
4462                 if (strnlen(name, NFT_SET_MAX_ANONLEN) >= NFT_SET_MAX_ANONLEN)
4463                         return -EINVAL;
4464
4465                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4466                 if (inuse == NULL)
4467                         return -ENOMEM;
4468 cont:
4469                 list_for_each_entry(i, &ctx->table->sets, list) {
4470                         int tmp;
4471
4472                         if (!nft_is_active_next(ctx->net, i))
4473                                 continue;
4474                         if (!sscanf(i->name, name, &tmp))
4475                                 continue;
4476                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4477                                 continue;
4478
4479                         set_bit(tmp - min, inuse);
4480                 }
4481
4482                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4483                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4484                         min += BITS_PER_BYTE * PAGE_SIZE;
4485                         memset(inuse, 0, PAGE_SIZE);
4486                         goto cont;
4487                 }
4488                 free_page((unsigned long)inuse);
4489         }
4490
4491         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4492         if (!set->name)
4493                 return -ENOMEM;
4494
4495         list_for_each_entry(i, &ctx->table->sets, list) {
4496                 if (!nft_is_active_next(ctx->net, i))
4497                         continue;
4498                 if (!strcmp(set->name, i->name)) {
4499                         kfree(set->name);
4500                         set->name = NULL;
4501                         return -ENFILE;
4502                 }
4503         }
4504         return 0;
4505 }
4506
4507 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4508 {
4509         u64 ms = be64_to_cpu(nla_get_be64(nla));
4510         u64 max = (u64)(~((u64)0));
4511
4512         max = div_u64(max, NSEC_PER_MSEC);
4513         if (ms >= max)
4514                 return -ERANGE;
4515
4516         ms *= NSEC_PER_MSEC;
4517         *result = nsecs_to_jiffies64(ms);
4518         return 0;
4519 }
4520
4521 __be64 nf_jiffies64_to_msecs(u64 input)
4522 {
4523         return cpu_to_be64(jiffies64_to_msecs(input));
4524 }
4525
4526 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4527                                      const struct nft_set *set)
4528 {
4529         struct nlattr *concat, *field;
4530         int i;
4531
4532         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4533         if (!concat)
4534                 return -ENOMEM;
4535
4536         for (i = 0; i < set->field_count; i++) {
4537                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4538                 if (!field)
4539                         return -ENOMEM;
4540
4541                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4542                                  htonl(set->field_len[i])))
4543                         return -ENOMEM;
4544
4545                 nla_nest_end(skb, field);
4546         }
4547
4548         nla_nest_end(skb, concat);
4549
4550         return 0;
4551 }
4552
4553 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4554                               const struct nft_set *set, u16 event, u16 flags)
4555 {
4556         u64 timeout = READ_ONCE(set->timeout);
4557         u32 gc_int = READ_ONCE(set->gc_int);
4558         u32 portid = ctx->portid;
4559         struct nlmsghdr *nlh;
4560         struct nlattr *nest;
4561         u32 seq = ctx->seq;
4562         int i;
4563
4564         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4565         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4566                            NFNETLINK_V0, nft_base_seq(ctx->net));
4567         if (!nlh)
4568                 goto nla_put_failure;
4569
4570         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4571                 goto nla_put_failure;
4572         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4573                 goto nla_put_failure;
4574         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4575                          NFTA_SET_PAD))
4576                 goto nla_put_failure;
4577
4578         if (event == NFT_MSG_DELSET) {
4579                 nlmsg_end(skb, nlh);
4580                 return 0;
4581         }
4582
4583         if (set->flags != 0)
4584                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4585                         goto nla_put_failure;
4586
4587         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4588                 goto nla_put_failure;
4589         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4590                 goto nla_put_failure;
4591         if (set->flags & NFT_SET_MAP) {
4592                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4593                         goto nla_put_failure;
4594                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4595                         goto nla_put_failure;
4596         }
4597         if (set->flags & NFT_SET_OBJECT &&
4598             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4599                 goto nla_put_failure;
4600
4601         if (timeout &&
4602             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4603                          nf_jiffies64_to_msecs(timeout),
4604                          NFTA_SET_PAD))
4605                 goto nla_put_failure;
4606         if (gc_int &&
4607             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4608                 goto nla_put_failure;
4609
4610         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4611                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4612                         goto nla_put_failure;
4613         }
4614
4615         if (set->udata &&
4616             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4617                 goto nla_put_failure;
4618
4619         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4620         if (!nest)
4621                 goto nla_put_failure;
4622         if (set->size &&
4623             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4624                 goto nla_put_failure;
4625
4626         if (set->field_count > 1 &&
4627             nf_tables_fill_set_concat(skb, set))
4628                 goto nla_put_failure;
4629
4630         nla_nest_end(skb, nest);
4631
4632         if (set->num_exprs == 1) {
4633                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4634                 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4635                         goto nla_put_failure;
4636
4637                 nla_nest_end(skb, nest);
4638         } else if (set->num_exprs > 1) {
4639                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4640                 if (nest == NULL)
4641                         goto nla_put_failure;
4642
4643                 for (i = 0; i < set->num_exprs; i++) {
4644                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4645                                           set->exprs[i], false) < 0)
4646                                 goto nla_put_failure;
4647                 }
4648                 nla_nest_end(skb, nest);
4649         }
4650
4651         nlmsg_end(skb, nlh);
4652         return 0;
4653
4654 nla_put_failure:
4655         nlmsg_trim(skb, nlh);
4656         return -1;
4657 }
4658
4659 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4660                                  const struct nft_set *set, int event,
4661                                  gfp_t gfp_flags)
4662 {
4663         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4664         u32 portid = ctx->portid;
4665         struct sk_buff *skb;
4666         u16 flags = 0;
4667         int err;
4668
4669         if (!ctx->report &&
4670             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4671                 return;
4672
4673         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4674         if (skb == NULL)
4675                 goto err;
4676
4677         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4678                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4679
4680         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4681         if (err < 0) {
4682                 kfree_skb(skb);
4683                 goto err;
4684         }
4685
4686         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4687         return;
4688 err:
4689         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4690 }
4691
4692 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4693 {
4694         const struct nft_set *set;
4695         unsigned int idx, s_idx = cb->args[0];
4696         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4697         struct net *net = sock_net(skb->sk);
4698         struct nft_ctx *ctx = cb->data, ctx_set;
4699         struct nftables_pernet *nft_net;
4700
4701         if (cb->args[1])
4702                 return skb->len;
4703
4704         rcu_read_lock();
4705         nft_net = nft_pernet(net);
4706         cb->seq = READ_ONCE(nft_net->base_seq);
4707
4708         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4709                 if (ctx->family != NFPROTO_UNSPEC &&
4710                     ctx->family != table->family)
4711                         continue;
4712
4713                 if (ctx->table && ctx->table != table)
4714                         continue;
4715
4716                 if (cur_table) {
4717                         if (cur_table != table)
4718                                 continue;
4719
4720                         cur_table = NULL;
4721                 }
4722                 idx = 0;
4723                 list_for_each_entry_rcu(set, &table->sets, list) {
4724                         if (idx < s_idx)
4725                                 goto cont;
4726                         if (!nft_is_active(net, set))
4727                                 goto cont;
4728
4729                         ctx_set = *ctx;
4730                         ctx_set.table = table;
4731                         ctx_set.family = table->family;
4732
4733                         if (nf_tables_fill_set(skb, &ctx_set, set,
4734                                                NFT_MSG_NEWSET,
4735                                                NLM_F_MULTI) < 0) {
4736                                 cb->args[0] = idx;
4737                                 cb->args[2] = (unsigned long) table;
4738                                 goto done;
4739                         }
4740                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4741 cont:
4742                         idx++;
4743                 }
4744                 if (s_idx)
4745                         s_idx = 0;
4746         }
4747         cb->args[1] = 1;
4748 done:
4749         rcu_read_unlock();
4750         return skb->len;
4751 }
4752
4753 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4754 {
4755         struct nft_ctx *ctx_dump = NULL;
4756
4757         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4758         if (ctx_dump == NULL)
4759                 return -ENOMEM;
4760
4761         cb->data = ctx_dump;
4762         return 0;
4763 }
4764
4765 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4766 {
4767         kfree(cb->data);
4768         return 0;
4769 }
4770
4771 /* called with rcu_read_lock held */
4772 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4773                             const struct nlattr * const nla[])
4774 {
4775         struct netlink_ext_ack *extack = info->extack;
4776         u8 genmask = nft_genmask_cur(info->net);
4777         u8 family = info->nfmsg->nfgen_family;
4778         struct nft_table *table = NULL;
4779         struct net *net = info->net;
4780         const struct nft_set *set;
4781         struct sk_buff *skb2;
4782         struct nft_ctx ctx;
4783         int err;
4784
4785         if (nla[NFTA_SET_TABLE]) {
4786                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4787                                          genmask, 0);
4788                 if (IS_ERR(table)) {
4789                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4790                         return PTR_ERR(table);
4791                 }
4792         }
4793
4794         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4795
4796         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4797                 struct netlink_dump_control c = {
4798                         .start = nf_tables_dump_sets_start,
4799                         .dump = nf_tables_dump_sets,
4800                         .done = nf_tables_dump_sets_done,
4801                         .data = &ctx,
4802                         .module = THIS_MODULE,
4803                 };
4804
4805                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4806         }
4807
4808         /* Only accept unspec with dump */
4809         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4810                 return -EAFNOSUPPORT;
4811         if (!nla[NFTA_SET_TABLE])
4812                 return -EINVAL;
4813
4814         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4815         if (IS_ERR(set)) {
4816                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4817                 return PTR_ERR(set);
4818         }
4819
4820         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4821         if (skb2 == NULL)
4822                 return -ENOMEM;
4823
4824         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4825         if (err < 0)
4826                 goto err_fill_set_info;
4827
4828         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4829
4830 err_fill_set_info:
4831         kfree_skb(skb2);
4832         return err;
4833 }
4834
4835 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4836                                      struct nft_set_desc *desc)
4837 {
4838         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4839         u32 len;
4840         int err;
4841
4842         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4843                 return -E2BIG;
4844
4845         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4846                                           nft_concat_policy, NULL);
4847         if (err < 0)
4848                 return err;
4849
4850         if (!tb[NFTA_SET_FIELD_LEN])
4851                 return -EINVAL;
4852
4853         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4854         if (!len || len > U8_MAX)
4855                 return -EINVAL;
4856
4857         desc->field_len[desc->field_count++] = len;
4858
4859         return 0;
4860 }
4861
4862 static int nft_set_desc_concat(struct nft_set_desc *desc,
4863                                const struct nlattr *nla)
4864 {
4865         u32 num_regs = 0, key_num_regs = 0;
4866         struct nlattr *attr;
4867         int rem, err, i;
4868
4869         nla_for_each_nested(attr, nla, rem) {
4870                 if (nla_type(attr) != NFTA_LIST_ELEM)
4871                         return -EINVAL;
4872
4873                 err = nft_set_desc_concat_parse(attr, desc);
4874                 if (err < 0)
4875                         return err;
4876         }
4877
4878         for (i = 0; i < desc->field_count; i++)
4879                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4880
4881         key_num_regs = DIV_ROUND_UP(desc->klen, sizeof(u32));
4882         if (key_num_regs != num_regs)
4883                 return -EINVAL;
4884
4885         if (num_regs > NFT_REG32_COUNT)
4886                 return -E2BIG;
4887
4888         return 0;
4889 }
4890
4891 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4892                                     const struct nlattr *nla)
4893 {
4894         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4895         int err;
4896
4897         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4898                                           nft_set_desc_policy, NULL);
4899         if (err < 0)
4900                 return err;
4901
4902         if (da[NFTA_SET_DESC_SIZE] != NULL)
4903                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4904         if (da[NFTA_SET_DESC_CONCAT])
4905                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4906
4907         return err;
4908 }
4909
4910 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4911                               const struct nlattr * const *nla,
4912                               struct nft_expr **exprs, int *num_exprs,
4913                               u32 flags)
4914 {
4915         struct nft_expr *expr;
4916         int err, i;
4917
4918         if (nla[NFTA_SET_EXPR]) {
4919                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4920                 if (IS_ERR(expr)) {
4921                         err = PTR_ERR(expr);
4922                         goto err_set_expr_alloc;
4923                 }
4924                 exprs[0] = expr;
4925                 (*num_exprs)++;
4926         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4927                 struct nlattr *tmp;
4928                 int left;
4929
4930                 if (!(flags & NFT_SET_EXPR)) {
4931                         err = -EINVAL;
4932                         goto err_set_expr_alloc;
4933                 }
4934                 i = 0;
4935                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4936                         if (i == NFT_SET_EXPR_MAX) {
4937                                 err = -E2BIG;
4938                                 goto err_set_expr_alloc;
4939                         }
4940                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4941                                 err = -EINVAL;
4942                                 goto err_set_expr_alloc;
4943                         }
4944                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4945                         if (IS_ERR(expr)) {
4946                                 err = PTR_ERR(expr);
4947                                 goto err_set_expr_alloc;
4948                         }
4949                         exprs[i++] = expr;
4950                         (*num_exprs)++;
4951                 }
4952         }
4953
4954         return 0;
4955
4956 err_set_expr_alloc:
4957         for (i = 0; i < *num_exprs; i++)
4958                 nft_expr_destroy(ctx, exprs[i]);
4959
4960         return err;
4961 }
4962
4963 static bool nft_set_is_same(const struct nft_set *set,
4964                             const struct nft_set_desc *desc,
4965                             struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4966 {
4967         int i;
4968
4969         if (set->ktype != desc->ktype ||
4970             set->dtype != desc->dtype ||
4971             set->flags != flags ||
4972             set->klen != desc->klen ||
4973             set->dlen != desc->dlen ||
4974             set->field_count != desc->field_count ||
4975             set->num_exprs != num_exprs)
4976                 return false;
4977
4978         for (i = 0; i < desc->field_count; i++) {
4979                 if (set->field_len[i] != desc->field_len[i])
4980                         return false;
4981         }
4982
4983         for (i = 0; i < num_exprs; i++) {
4984                 if (set->exprs[i]->ops != exprs[i]->ops)
4985                         return false;
4986         }
4987
4988         return true;
4989 }
4990
4991 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4992                             const struct nlattr * const nla[])
4993 {
4994         struct netlink_ext_ack *extack = info->extack;
4995         u8 genmask = nft_genmask_next(info->net);
4996         u8 family = info->nfmsg->nfgen_family;
4997         const struct nft_set_ops *ops;
4998         struct net *net = info->net;
4999         struct nft_set_desc desc;
5000         struct nft_table *table;
5001         unsigned char *udata;
5002         struct nft_set *set;
5003         struct nft_ctx ctx;
5004         size_t alloc_size;
5005         int num_exprs = 0;
5006         char *name;
5007         int err, i;
5008         u16 udlen;
5009         u32 flags;
5010         u64 size;
5011
5012         if (nla[NFTA_SET_TABLE] == NULL ||
5013             nla[NFTA_SET_NAME] == NULL ||
5014             nla[NFTA_SET_KEY_LEN] == NULL ||
5015             nla[NFTA_SET_ID] == NULL)
5016                 return -EINVAL;
5017
5018         memset(&desc, 0, sizeof(desc));
5019
5020         desc.ktype = NFT_DATA_VALUE;
5021         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
5022                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
5023                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
5024                         return -EINVAL;
5025         }
5026
5027         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
5028         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
5029                 return -EINVAL;
5030
5031         flags = 0;
5032         if (nla[NFTA_SET_FLAGS] != NULL) {
5033                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
5034                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
5035                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
5036                               NFT_SET_MAP | NFT_SET_EVAL |
5037                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
5038                         return -EOPNOTSUPP;
5039                 /* Only one of these operations is supported */
5040                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
5041                              (NFT_SET_MAP | NFT_SET_OBJECT))
5042                         return -EOPNOTSUPP;
5043                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
5044                              (NFT_SET_EVAL | NFT_SET_OBJECT))
5045                         return -EOPNOTSUPP;
5046                 if ((flags & (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT | NFT_SET_EVAL)) ==
5047                              (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT))
5048                         return -EOPNOTSUPP;
5049                 if ((flags & (NFT_SET_CONSTANT | NFT_SET_TIMEOUT)) ==
5050                              (NFT_SET_CONSTANT | NFT_SET_TIMEOUT))
5051                         return -EOPNOTSUPP;
5052         }
5053
5054         desc.dtype = 0;
5055         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
5056                 if (!(flags & NFT_SET_MAP))
5057                         return -EINVAL;
5058
5059                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
5060                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
5061                     desc.dtype != NFT_DATA_VERDICT)
5062                         return -EINVAL;
5063
5064                 if (desc.dtype != NFT_DATA_VERDICT) {
5065                         if (nla[NFTA_SET_DATA_LEN] == NULL)
5066                                 return -EINVAL;
5067                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
5068                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
5069                                 return -EINVAL;
5070                 } else
5071                         desc.dlen = sizeof(struct nft_verdict);
5072         } else if (flags & NFT_SET_MAP)
5073                 return -EINVAL;
5074
5075         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
5076                 if (!(flags & NFT_SET_OBJECT))
5077                         return -EINVAL;
5078
5079                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
5080                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
5081                     desc.objtype > NFT_OBJECT_MAX)
5082                         return -EOPNOTSUPP;
5083         } else if (flags & NFT_SET_OBJECT)
5084                 return -EINVAL;
5085         else
5086                 desc.objtype = NFT_OBJECT_UNSPEC;
5087
5088         desc.timeout = 0;
5089         if (nla[NFTA_SET_TIMEOUT] != NULL) {
5090                 if (!(flags & NFT_SET_TIMEOUT))
5091                         return -EINVAL;
5092
5093                 if (flags & NFT_SET_ANONYMOUS)
5094                         return -EOPNOTSUPP;
5095
5096                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
5097                 if (err)
5098                         return err;
5099         }
5100         desc.gc_int = 0;
5101         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
5102                 if (!(flags & NFT_SET_TIMEOUT))
5103                         return -EINVAL;
5104
5105                 if (flags & NFT_SET_ANONYMOUS)
5106                         return -EOPNOTSUPP;
5107
5108                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
5109         }
5110
5111         desc.policy = NFT_SET_POL_PERFORMANCE;
5112         if (nla[NFTA_SET_POLICY] != NULL) {
5113                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
5114                 switch (desc.policy) {
5115                 case NFT_SET_POL_PERFORMANCE:
5116                 case NFT_SET_POL_MEMORY:
5117                         break;
5118                 default:
5119                         return -EOPNOTSUPP;
5120                 }
5121         }
5122
5123         if (nla[NFTA_SET_DESC] != NULL) {
5124                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
5125                 if (err < 0)
5126                         return err;
5127
5128                 if (desc.field_count > 1) {
5129                         if (!(flags & NFT_SET_CONCAT))
5130                                 return -EINVAL;
5131                 } else if (flags & NFT_SET_CONCAT) {
5132                         return -EINVAL;
5133                 }
5134         } else if (flags & NFT_SET_CONCAT) {
5135                 return -EINVAL;
5136         }
5137
5138         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
5139                 desc.expr = true;
5140
5141         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
5142                                  NETLINK_CB(skb).portid);
5143         if (IS_ERR(table)) {
5144                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5145                 return PTR_ERR(table);
5146         }
5147
5148         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5149
5150         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
5151         if (IS_ERR(set)) {
5152                 if (PTR_ERR(set) != -ENOENT) {
5153                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5154                         return PTR_ERR(set);
5155                 }
5156         } else {
5157                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
5158
5159                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
5160                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5161                         return -EEXIST;
5162                 }
5163                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
5164                         return -EOPNOTSUPP;
5165
5166                 if (nft_set_is_anonymous(set))
5167                         return -EOPNOTSUPP;
5168
5169                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
5170                 if (err < 0)
5171                         return err;
5172
5173                 err = 0;
5174                 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
5175                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5176                         err = -EEXIST;
5177                 }
5178
5179                 for (i = 0; i < num_exprs; i++)
5180                         nft_expr_destroy(&ctx, exprs[i]);
5181
5182                 if (err < 0)
5183                         return err;
5184
5185                 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5186         }
5187
5188         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5189                 return -ENOENT;
5190
5191         ops = nft_select_set_ops(&ctx, flags, &desc);
5192         if (IS_ERR(ops))
5193                 return PTR_ERR(ops);
5194
5195         udlen = 0;
5196         if (nla[NFTA_SET_USERDATA])
5197                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5198
5199         size = 0;
5200         if (ops->privsize != NULL)
5201                 size = ops->privsize(nla, &desc);
5202         alloc_size = sizeof(*set) + size + udlen;
5203         if (alloc_size < size || alloc_size > INT_MAX)
5204                 return -ENOMEM;
5205
5206         if (!nft_use_inc(&table->use))
5207                 return -EMFILE;
5208
5209         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5210         if (!set) {
5211                 err = -ENOMEM;
5212                 goto err_alloc;
5213         }
5214
5215         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5216         if (!name) {
5217                 err = -ENOMEM;
5218                 goto err_set_name;
5219         }
5220
5221         err = nf_tables_set_alloc_name(&ctx, set, name);
5222         kfree(name);
5223         if (err < 0)
5224                 goto err_set_name;
5225
5226         udata = NULL;
5227         if (udlen) {
5228                 udata = set->data + size;
5229                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5230         }
5231
5232         INIT_LIST_HEAD(&set->bindings);
5233         INIT_LIST_HEAD(&set->catchall_list);
5234         refcount_set(&set->refs, 1);
5235         set->table = table;
5236         write_pnet(&set->net, net);
5237         set->ops = ops;
5238         set->ktype = desc.ktype;
5239         set->klen = desc.klen;
5240         set->dtype = desc.dtype;
5241         set->objtype = desc.objtype;
5242         set->dlen = desc.dlen;
5243         set->flags = flags;
5244         set->size = desc.size;
5245         set->policy = desc.policy;
5246         set->udlen = udlen;
5247         set->udata = udata;
5248         set->timeout = desc.timeout;
5249         set->gc_int = desc.gc_int;
5250
5251         set->field_count = desc.field_count;
5252         for (i = 0; i < desc.field_count; i++)
5253                 set->field_len[i] = desc.field_len[i];
5254
5255         err = ops->init(set, &desc, nla);
5256         if (err < 0)
5257                 goto err_set_init;
5258
5259         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5260         if (err < 0)
5261                 goto err_set_destroy;
5262
5263         set->num_exprs = num_exprs;
5264         set->handle = nf_tables_alloc_handle(table);
5265         INIT_LIST_HEAD(&set->pending_update);
5266
5267         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5268         if (err < 0)
5269                 goto err_set_expr_alloc;
5270
5271         list_add_tail_rcu(&set->list, &table->sets);
5272
5273         return 0;
5274
5275 err_set_expr_alloc:
5276         for (i = 0; i < set->num_exprs; i++)
5277                 nft_expr_destroy(&ctx, set->exprs[i]);
5278 err_set_destroy:
5279         ops->destroy(&ctx, set);
5280 err_set_init:
5281         kfree(set->name);
5282 err_set_name:
5283         kvfree(set);
5284 err_alloc:
5285         nft_use_dec_restore(&table->use);
5286
5287         return err;
5288 }
5289
5290 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5291                                      struct nft_set *set)
5292 {
5293         struct nft_set_elem_catchall *next, *catchall;
5294
5295         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5296                 list_del_rcu(&catchall->list);
5297                 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5298                 kfree_rcu(catchall, rcu);
5299         }
5300 }
5301
5302 static void nft_set_put(struct nft_set *set)
5303 {
5304         if (refcount_dec_and_test(&set->refs)) {
5305                 kfree(set->name);
5306                 kvfree(set);
5307         }
5308 }
5309
5310 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5311 {
5312         int i;
5313
5314         if (WARN_ON(set->use > 0))
5315                 return;
5316
5317         for (i = 0; i < set->num_exprs; i++)
5318                 nft_expr_destroy(ctx, set->exprs[i]);
5319
5320         set->ops->destroy(ctx, set);
5321         nft_set_catchall_destroy(ctx, set);
5322         nft_set_put(set);
5323 }
5324
5325 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5326                             const struct nlattr * const nla[])
5327 {
5328         struct netlink_ext_ack *extack = info->extack;
5329         u8 genmask = nft_genmask_next(info->net);
5330         u8 family = info->nfmsg->nfgen_family;
5331         struct net *net = info->net;
5332         const struct nlattr *attr;
5333         struct nft_table *table;
5334         struct nft_set *set;
5335         struct nft_ctx ctx;
5336
5337         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5338                 return -EAFNOSUPPORT;
5339
5340         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5341                                  genmask, NETLINK_CB(skb).portid);
5342         if (IS_ERR(table)) {
5343                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5344                 return PTR_ERR(table);
5345         }
5346
5347         if (nla[NFTA_SET_HANDLE]) {
5348                 attr = nla[NFTA_SET_HANDLE];
5349                 set = nft_set_lookup_byhandle(table, attr, genmask);
5350         } else {
5351                 attr = nla[NFTA_SET_NAME];
5352                 set = nft_set_lookup(table, attr, genmask);
5353         }
5354
5355         if (IS_ERR(set)) {
5356                 if (PTR_ERR(set) == -ENOENT &&
5357                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5358                         return 0;
5359
5360                 NL_SET_BAD_ATTR(extack, attr);
5361                 return PTR_ERR(set);
5362         }
5363         if (set->use ||
5364             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5365              atomic_read(&set->nelems) > 0)) {
5366                 NL_SET_BAD_ATTR(extack, attr);
5367                 return -EBUSY;
5368         }
5369
5370         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5371
5372         return nft_delset(&ctx, set);
5373 }
5374
5375 static int nft_validate_register_store(const struct nft_ctx *ctx,
5376                                        enum nft_registers reg,
5377                                        const struct nft_data *data,
5378                                        enum nft_data_types type,
5379                                        unsigned int len);
5380
5381 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5382                                      struct nft_set *set,
5383                                      struct nft_elem_priv *elem_priv)
5384 {
5385         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5386         enum nft_registers dreg;
5387
5388         dreg = nft_type_to_reg(set->dtype);
5389         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5390                                            set->dtype == NFT_DATA_VERDICT ?
5391                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
5392                                            set->dlen);
5393 }
5394
5395 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5396                                         struct nft_set *set,
5397                                         const struct nft_set_iter *iter,
5398                                         struct nft_elem_priv *elem_priv)
5399 {
5400         return nft_setelem_data_validate(ctx, set, elem_priv);
5401 }
5402
5403 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5404                                        struct nft_set *set)
5405 {
5406         u8 genmask = nft_genmask_next(ctx->net);
5407         struct nft_set_elem_catchall *catchall;
5408         struct nft_set_ext *ext;
5409         int ret = 0;
5410
5411         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5412                 ext = nft_set_elem_ext(set, catchall->elem);
5413                 if (!nft_set_elem_active(ext, genmask))
5414                         continue;
5415
5416                 ret = nft_setelem_data_validate(ctx, set, catchall->elem);
5417                 if (ret < 0)
5418                         break;
5419         }
5420
5421         return ret;
5422 }
5423
5424 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5425                        struct nft_set_binding *binding)
5426 {
5427         struct nft_set_binding *i;
5428         struct nft_set_iter iter;
5429
5430         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5431                 return -EBUSY;
5432
5433         if (binding->flags & NFT_SET_MAP) {
5434                 /* If the set is already bound to the same chain all
5435                  * jumps are already validated for that chain.
5436                  */
5437                 list_for_each_entry(i, &set->bindings, list) {
5438                         if (i->flags & NFT_SET_MAP &&
5439                             i->chain == binding->chain)
5440                                 goto bind;
5441                 }
5442
5443                 iter.genmask    = nft_genmask_next(ctx->net);
5444                 iter.skip       = 0;
5445                 iter.count      = 0;
5446                 iter.err        = 0;
5447                 iter.fn         = nf_tables_bind_check_setelem;
5448
5449                 set->ops->walk(ctx, set, &iter);
5450                 if (!iter.err)
5451                         iter.err = nft_set_catchall_bind_check(ctx, set);
5452
5453                 if (iter.err < 0)
5454                         return iter.err;
5455         }
5456 bind:
5457         if (!nft_use_inc(&set->use))
5458                 return -EMFILE;
5459
5460         binding->chain = ctx->chain;
5461         list_add_tail_rcu(&binding->list, &set->bindings);
5462         nft_set_trans_bind(ctx, set);
5463
5464         return 0;
5465 }
5466 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5467
5468 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5469                                  struct nft_set_binding *binding, bool event)
5470 {
5471         list_del_rcu(&binding->list);
5472
5473         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5474                 list_del_rcu(&set->list);
5475                 set->dead = 1;
5476                 if (event)
5477                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5478                                              GFP_KERNEL);
5479         }
5480 }
5481
5482 static void nft_setelem_data_activate(const struct net *net,
5483                                       const struct nft_set *set,
5484                                       struct nft_elem_priv *elem_priv);
5485
5486 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5487                                 struct nft_set *set,
5488                                 const struct nft_set_iter *iter,
5489                                 struct nft_elem_priv *elem_priv)
5490 {
5491         nft_setelem_data_activate(ctx->net, set, elem_priv);
5492
5493         return 0;
5494 }
5495
5496 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5497                                       struct nft_set *set)
5498 {
5499         u8 genmask = nft_genmask_next(ctx->net);
5500         struct nft_set_elem_catchall *catchall;
5501         struct nft_set_ext *ext;
5502
5503         list_for_each_entry(catchall, &set->catchall_list, list) {
5504                 ext = nft_set_elem_ext(set, catchall->elem);
5505                 if (!nft_set_elem_active(ext, genmask))
5506                         continue;
5507
5508                 nft_setelem_data_activate(ctx->net, set, catchall->elem);
5509                 break;
5510         }
5511 }
5512
5513 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5514 {
5515         struct nft_set_iter iter = {
5516                 .genmask        = nft_genmask_next(ctx->net),
5517                 .fn             = nft_mapelem_activate,
5518         };
5519
5520         set->ops->walk(ctx, set, &iter);
5521         WARN_ON_ONCE(iter.err);
5522
5523         nft_map_catchall_activate(ctx, set);
5524 }
5525
5526 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5527 {
5528         if (nft_set_is_anonymous(set)) {
5529                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5530                         nft_map_activate(ctx, set);
5531
5532                 nft_clear(ctx->net, set);
5533         }
5534
5535         nft_use_inc_restore(&set->use);
5536 }
5537 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5538
5539 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5540                               struct nft_set_binding *binding,
5541                               enum nft_trans_phase phase)
5542 {
5543         switch (phase) {
5544         case NFT_TRANS_PREPARE_ERROR:
5545                 nft_set_trans_unbind(ctx, set);
5546                 if (nft_set_is_anonymous(set))
5547                         nft_deactivate_next(ctx->net, set);
5548                 else
5549                         list_del_rcu(&binding->list);
5550
5551                 nft_use_dec(&set->use);
5552                 break;
5553         case NFT_TRANS_PREPARE:
5554                 if (nft_set_is_anonymous(set)) {
5555                         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5556                                 nft_map_deactivate(ctx, set);
5557
5558                         nft_deactivate_next(ctx->net, set);
5559                 }
5560                 nft_use_dec(&set->use);
5561                 return;
5562         case NFT_TRANS_ABORT:
5563         case NFT_TRANS_RELEASE:
5564                 if (nft_set_is_anonymous(set) &&
5565                     set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5566                         nft_map_deactivate(ctx, set);
5567
5568                 nft_use_dec(&set->use);
5569                 fallthrough;
5570         default:
5571                 nf_tables_unbind_set(ctx, set, binding,
5572                                      phase == NFT_TRANS_COMMIT);
5573         }
5574 }
5575 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5576
5577 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5578 {
5579         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5580                 nft_set_destroy(ctx, set);
5581 }
5582 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5583
5584 const struct nft_set_ext_type nft_set_ext_types[] = {
5585         [NFT_SET_EXT_KEY]               = {
5586                 .align  = __alignof__(u32),
5587         },
5588         [NFT_SET_EXT_DATA]              = {
5589                 .align  = __alignof__(u32),
5590         },
5591         [NFT_SET_EXT_EXPRESSIONS]       = {
5592                 .align  = __alignof__(struct nft_set_elem_expr),
5593         },
5594         [NFT_SET_EXT_OBJREF]            = {
5595                 .len    = sizeof(struct nft_object *),
5596                 .align  = __alignof__(struct nft_object *),
5597         },
5598         [NFT_SET_EXT_FLAGS]             = {
5599                 .len    = sizeof(u8),
5600                 .align  = __alignof__(u8),
5601         },
5602         [NFT_SET_EXT_TIMEOUT]           = {
5603                 .len    = sizeof(u64),
5604                 .align  = __alignof__(u64),
5605         },
5606         [NFT_SET_EXT_EXPIRATION]        = {
5607                 .len    = sizeof(u64),
5608                 .align  = __alignof__(u64),
5609         },
5610         [NFT_SET_EXT_USERDATA]          = {
5611                 .len    = sizeof(struct nft_userdata),
5612                 .align  = __alignof__(struct nft_userdata),
5613         },
5614         [NFT_SET_EXT_KEY_END]           = {
5615                 .align  = __alignof__(u32),
5616         },
5617 };
5618
5619 /*
5620  * Set elements
5621  */
5622
5623 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5624         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
5625         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
5626         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
5627         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
5628         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
5629         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
5630                                             .len = NFT_USERDATA_MAXLEN },
5631         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
5632         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
5633                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
5634         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
5635         [NFTA_SET_ELEM_EXPRESSIONS]     = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
5636 };
5637
5638 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5639         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
5640                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
5641         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
5642                                             .len = NFT_SET_MAXNAMELEN - 1 },
5643         [NFTA_SET_ELEM_LIST_ELEMENTS]   = NLA_POLICY_NESTED_ARRAY(nft_set_elem_policy),
5644         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
5645 };
5646
5647 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5648                                   const struct nft_set *set,
5649                                   const struct nft_set_ext *ext,
5650                                   bool reset)
5651 {
5652         struct nft_set_elem_expr *elem_expr;
5653         u32 size, num_exprs = 0;
5654         struct nft_expr *expr;
5655         struct nlattr *nest;
5656
5657         elem_expr = nft_set_ext_expr(ext);
5658         nft_setelem_expr_foreach(expr, elem_expr, size)
5659                 num_exprs++;
5660
5661         if (num_exprs == 1) {
5662                 expr = nft_setelem_expr_at(elem_expr, 0);
5663                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5664                         return -1;
5665
5666                 return 0;
5667         } else if (num_exprs > 1) {
5668                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5669                 if (nest == NULL)
5670                         goto nla_put_failure;
5671
5672                 nft_setelem_expr_foreach(expr, elem_expr, size) {
5673                         expr = nft_setelem_expr_at(elem_expr, size);
5674                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5675                                 goto nla_put_failure;
5676                 }
5677                 nla_nest_end(skb, nest);
5678         }
5679         return 0;
5680
5681 nla_put_failure:
5682         return -1;
5683 }
5684
5685 static int nf_tables_fill_setelem(struct sk_buff *skb,
5686                                   const struct nft_set *set,
5687                                   const struct nft_elem_priv *elem_priv,
5688                                   bool reset)
5689 {
5690         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5691         unsigned char *b = skb_tail_pointer(skb);
5692         struct nlattr *nest;
5693
5694         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5695         if (nest == NULL)
5696                 goto nla_put_failure;
5697
5698         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5699             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5700                           NFT_DATA_VALUE, set->klen) < 0)
5701                 goto nla_put_failure;
5702
5703         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5704             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5705                           NFT_DATA_VALUE, set->klen) < 0)
5706                 goto nla_put_failure;
5707
5708         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5709             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5710                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5711                           set->dlen) < 0)
5712                 goto nla_put_failure;
5713
5714         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5715             nft_set_elem_expr_dump(skb, set, ext, reset))
5716                 goto nla_put_failure;
5717
5718         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5719             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5720                            (*nft_set_ext_obj(ext))->key.name) < 0)
5721                 goto nla_put_failure;
5722
5723         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5724             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5725                          htonl(*nft_set_ext_flags(ext))))
5726                 goto nla_put_failure;
5727
5728         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5729             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5730                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5731                          NFTA_SET_ELEM_PAD))
5732                 goto nla_put_failure;
5733
5734         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5735                 u64 expires, now = get_jiffies_64();
5736
5737                 expires = *nft_set_ext_expiration(ext);
5738                 if (time_before64(now, expires))
5739                         expires -= now;
5740                 else
5741                         expires = 0;
5742
5743                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5744                                  nf_jiffies64_to_msecs(expires),
5745                                  NFTA_SET_ELEM_PAD))
5746                         goto nla_put_failure;
5747         }
5748
5749         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5750                 struct nft_userdata *udata;
5751
5752                 udata = nft_set_ext_userdata(ext);
5753                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5754                             udata->len + 1, udata->data))
5755                         goto nla_put_failure;
5756         }
5757
5758         nla_nest_end(skb, nest);
5759         return 0;
5760
5761 nla_put_failure:
5762         nlmsg_trim(skb, b);
5763         return -EMSGSIZE;
5764 }
5765
5766 struct nft_set_dump_args {
5767         const struct netlink_callback   *cb;
5768         struct nft_set_iter             iter;
5769         struct sk_buff                  *skb;
5770         bool                            reset;
5771 };
5772
5773 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5774                                   struct nft_set *set,
5775                                   const struct nft_set_iter *iter,
5776                                   struct nft_elem_priv *elem_priv)
5777 {
5778         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5779         struct nft_set_dump_args *args;
5780
5781         if (nft_set_elem_expired(ext) || nft_set_elem_is_dead(ext))
5782                 return 0;
5783
5784         args = container_of(iter, struct nft_set_dump_args, iter);
5785         return nf_tables_fill_setelem(args->skb, set, elem_priv, args->reset);
5786 }
5787
5788 static void audit_log_nft_set_reset(const struct nft_table *table,
5789                                     unsigned int base_seq,
5790                                     unsigned int nentries)
5791 {
5792         char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
5793
5794         audit_log_nfcfg(buf, table->family, nentries,
5795                         AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
5796         kfree(buf);
5797 }
5798
5799 struct nft_set_dump_ctx {
5800         const struct nft_set    *set;
5801         struct nft_ctx          ctx;
5802         bool                    reset;
5803 };
5804
5805 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5806                                  const struct nft_set *set, bool reset,
5807                                  unsigned int base_seq)
5808 {
5809         struct nft_set_elem_catchall *catchall;
5810         u8 genmask = nft_genmask_cur(net);
5811         struct nft_set_ext *ext;
5812         int ret = 0;
5813
5814         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5815                 ext = nft_set_elem_ext(set, catchall->elem);
5816                 if (!nft_set_elem_active(ext, genmask) ||
5817                     nft_set_elem_expired(ext))
5818                         continue;
5819
5820                 ret = nf_tables_fill_setelem(skb, set, catchall->elem, reset);
5821                 if (reset && !ret)
5822                         audit_log_nft_set_reset(set->table, base_seq, 1);
5823                 break;
5824         }
5825
5826         return ret;
5827 }
5828
5829 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5830 {
5831         struct nft_set_dump_ctx *dump_ctx = cb->data;
5832         struct net *net = sock_net(skb->sk);
5833         struct nftables_pernet *nft_net;
5834         struct nft_table *table;
5835         struct nft_set *set;
5836         struct nft_set_dump_args args;
5837         bool set_found = false;
5838         struct nlmsghdr *nlh;
5839         struct nlattr *nest;
5840         u32 portid, seq;
5841         int event;
5842
5843         rcu_read_lock();
5844         nft_net = nft_pernet(net);
5845         cb->seq = READ_ONCE(nft_net->base_seq);
5846
5847         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5848                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5849                     dump_ctx->ctx.family != table->family)
5850                         continue;
5851
5852                 if (table != dump_ctx->ctx.table)
5853                         continue;
5854
5855                 list_for_each_entry_rcu(set, &table->sets, list) {
5856                         if (set == dump_ctx->set) {
5857                                 set_found = true;
5858                                 break;
5859                         }
5860                 }
5861                 break;
5862         }
5863
5864         if (!set_found) {
5865                 rcu_read_unlock();
5866                 return -ENOENT;
5867         }
5868
5869         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5870         portid = NETLINK_CB(cb->skb).portid;
5871         seq    = cb->nlh->nlmsg_seq;
5872
5873         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5874                            table->family, NFNETLINK_V0, nft_base_seq(net));
5875         if (!nlh)
5876                 goto nla_put_failure;
5877
5878         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5879                 goto nla_put_failure;
5880         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5881                 goto nla_put_failure;
5882
5883         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5884         if (nest == NULL)
5885                 goto nla_put_failure;
5886
5887         args.cb                 = cb;
5888         args.skb                = skb;
5889         args.reset              = dump_ctx->reset;
5890         args.iter.genmask       = nft_genmask_cur(net);
5891         args.iter.skip          = cb->args[0];
5892         args.iter.count         = 0;
5893         args.iter.err           = 0;
5894         args.iter.fn            = nf_tables_dump_setelem;
5895         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5896
5897         if (!args.iter.err && args.iter.count == cb->args[0])
5898                 args.iter.err = nft_set_catchall_dump(net, skb, set,
5899                                                       dump_ctx->reset, cb->seq);
5900         nla_nest_end(skb, nest);
5901         nlmsg_end(skb, nlh);
5902
5903         rcu_read_unlock();
5904
5905         if (args.iter.err && args.iter.err != -EMSGSIZE)
5906                 return args.iter.err;
5907         if (args.iter.count == cb->args[0])
5908                 return 0;
5909
5910         cb->args[0] = args.iter.count;
5911         return skb->len;
5912
5913 nla_put_failure:
5914         rcu_read_unlock();
5915         return -ENOSPC;
5916 }
5917
5918 static int nf_tables_dumpreset_set(struct sk_buff *skb,
5919                                    struct netlink_callback *cb)
5920 {
5921         struct nftables_pernet *nft_net = nft_pernet(sock_net(skb->sk));
5922         struct nft_set_dump_ctx *dump_ctx = cb->data;
5923         int ret, skip = cb->args[0];
5924
5925         mutex_lock(&nft_net->commit_mutex);
5926
5927         ret = nf_tables_dump_set(skb, cb);
5928
5929         if (cb->args[0] > skip)
5930                 audit_log_nft_set_reset(dump_ctx->ctx.table, cb->seq,
5931                                         cb->args[0] - skip);
5932
5933         mutex_unlock(&nft_net->commit_mutex);
5934
5935         return ret;
5936 }
5937
5938 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5939 {
5940         struct nft_set_dump_ctx *dump_ctx = cb->data;
5941
5942         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5943
5944         return cb->data ? 0 : -ENOMEM;
5945 }
5946
5947 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5948 {
5949         kfree(cb->data);
5950         return 0;
5951 }
5952
5953 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5954                                        const struct nft_ctx *ctx, u32 seq,
5955                                        u32 portid, int event, u16 flags,
5956                                        const struct nft_set *set,
5957                                        const struct nft_elem_priv *elem_priv,
5958                                        bool reset)
5959 {
5960         struct nlmsghdr *nlh;
5961         struct nlattr *nest;
5962         int err;
5963
5964         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5965         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5966                            NFNETLINK_V0, nft_base_seq(ctx->net));
5967         if (!nlh)
5968                 goto nla_put_failure;
5969
5970         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5971                 goto nla_put_failure;
5972         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5973                 goto nla_put_failure;
5974
5975         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5976         if (nest == NULL)
5977                 goto nla_put_failure;
5978
5979         err = nf_tables_fill_setelem(skb, set, elem_priv, reset);
5980         if (err < 0)
5981                 goto nla_put_failure;
5982
5983         nla_nest_end(skb, nest);
5984
5985         nlmsg_end(skb, nlh);
5986         return 0;
5987
5988 nla_put_failure:
5989         nlmsg_trim(skb, nlh);
5990         return -1;
5991 }
5992
5993 static int nft_setelem_parse_flags(const struct nft_set *set,
5994                                    const struct nlattr *attr, u32 *flags)
5995 {
5996         if (attr == NULL)
5997                 return 0;
5998
5999         *flags = ntohl(nla_get_be32(attr));
6000         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
6001                 return -EOPNOTSUPP;
6002         if (!(set->flags & NFT_SET_INTERVAL) &&
6003             *flags & NFT_SET_ELEM_INTERVAL_END)
6004                 return -EINVAL;
6005         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
6006             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
6007                 return -EINVAL;
6008
6009         return 0;
6010 }
6011
6012 static int nft_setelem_parse_key(struct nft_ctx *ctx, const struct nft_set *set,
6013                                  struct nft_data *key, struct nlattr *attr)
6014 {
6015         struct nft_data_desc desc = {
6016                 .type   = NFT_DATA_VALUE,
6017                 .size   = NFT_DATA_VALUE_MAXLEN,
6018                 .len    = set->klen,
6019         };
6020
6021         return nft_data_init(ctx, key, &desc, attr);
6022 }
6023
6024 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
6025                                   struct nft_data_desc *desc,
6026                                   struct nft_data *data,
6027                                   struct nlattr *attr)
6028 {
6029         u32 dtype;
6030
6031         if (set->dtype == NFT_DATA_VERDICT)
6032                 dtype = NFT_DATA_VERDICT;
6033         else
6034                 dtype = NFT_DATA_VALUE;
6035
6036         desc->type = dtype;
6037         desc->size = NFT_DATA_VALUE_MAXLEN;
6038         desc->len = set->dlen;
6039         desc->flags = NFT_DATA_DESC_SETELEM;
6040
6041         return nft_data_init(ctx, data, desc, attr);
6042 }
6043
6044 static void *nft_setelem_catchall_get(const struct net *net,
6045                                       const struct nft_set *set)
6046 {
6047         struct nft_set_elem_catchall *catchall;
6048         u8 genmask = nft_genmask_cur(net);
6049         struct nft_set_ext *ext;
6050         void *priv = NULL;
6051
6052         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6053                 ext = nft_set_elem_ext(set, catchall->elem);
6054                 if (!nft_set_elem_active(ext, genmask) ||
6055                     nft_set_elem_expired(ext))
6056                         continue;
6057
6058                 priv = catchall->elem;
6059                 break;
6060         }
6061
6062         return priv;
6063 }
6064
6065 static int nft_setelem_get(struct nft_ctx *ctx, const struct nft_set *set,
6066                            struct nft_set_elem *elem, u32 flags)
6067 {
6068         void *priv;
6069
6070         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6071                 priv = set->ops->get(ctx->net, set, elem, flags);
6072                 if (IS_ERR(priv))
6073                         return PTR_ERR(priv);
6074         } else {
6075                 priv = nft_setelem_catchall_get(ctx->net, set);
6076                 if (!priv)
6077                         return -ENOENT;
6078         }
6079         elem->priv = priv;
6080
6081         return 0;
6082 }
6083
6084 static int nft_get_set_elem(struct nft_ctx *ctx, const struct nft_set *set,
6085                             const struct nlattr *attr, bool reset)
6086 {
6087         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6088         struct nft_set_elem elem;
6089         struct sk_buff *skb;
6090         uint32_t flags = 0;
6091         int err;
6092
6093         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6094                                           nft_set_elem_policy, NULL);
6095         if (err < 0)
6096                 return err;
6097
6098         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6099         if (err < 0)
6100                 return err;
6101
6102         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6103                 return -EINVAL;
6104
6105         if (nla[NFTA_SET_ELEM_KEY]) {
6106                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6107                                             nla[NFTA_SET_ELEM_KEY]);
6108                 if (err < 0)
6109                         return err;
6110         }
6111
6112         if (nla[NFTA_SET_ELEM_KEY_END]) {
6113                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6114                                             nla[NFTA_SET_ELEM_KEY_END]);
6115                 if (err < 0)
6116                         return err;
6117         }
6118
6119         err = nft_setelem_get(ctx, set, &elem, flags);
6120         if (err < 0)
6121                 return err;
6122
6123         err = -ENOMEM;
6124         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
6125         if (skb == NULL)
6126                 return err;
6127
6128         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
6129                                           NFT_MSG_NEWSETELEM, 0, set, elem.priv,
6130                                           reset);
6131         if (err < 0)
6132                 goto err_fill_setelem;
6133
6134         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
6135
6136 err_fill_setelem:
6137         kfree_skb(skb);
6138         return err;
6139 }
6140
6141 static int nft_set_dump_ctx_init(struct nft_set_dump_ctx *dump_ctx,
6142                                  const struct sk_buff *skb,
6143                                  const struct nfnl_info *info,
6144                                  const struct nlattr * const nla[],
6145                                  bool reset)
6146 {
6147         struct netlink_ext_ack *extack = info->extack;
6148         u8 genmask = nft_genmask_cur(info->net);
6149         u8 family = info->nfmsg->nfgen_family;
6150         struct net *net = info->net;
6151         struct nft_table *table;
6152         struct nft_set *set;
6153
6154         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6155                                  genmask, 0);
6156         if (IS_ERR(table)) {
6157                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6158                 return PTR_ERR(table);
6159         }
6160
6161         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6162         if (IS_ERR(set)) {
6163                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
6164                 return PTR_ERR(set);
6165         }
6166
6167         nft_ctx_init(&dump_ctx->ctx, net, skb,
6168                      info->nlh, family, table, NULL, nla);
6169         dump_ctx->set = set;
6170         dump_ctx->reset = reset;
6171         return 0;
6172 }
6173
6174 /* called with rcu_read_lock held */
6175 static int nf_tables_getsetelem(struct sk_buff *skb,
6176                                 const struct nfnl_info *info,
6177                                 const struct nlattr * const nla[])
6178 {
6179         struct netlink_ext_ack *extack = info->extack;
6180         struct nft_set_dump_ctx dump_ctx;
6181         struct nlattr *attr;
6182         int rem, err = 0;
6183
6184         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6185                 struct netlink_dump_control c = {
6186                         .start = nf_tables_dump_set_start,
6187                         .dump = nf_tables_dump_set,
6188                         .done = nf_tables_dump_set_done,
6189                         .module = THIS_MODULE,
6190                 };
6191
6192                 err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, false);
6193                 if (err)
6194                         return err;
6195
6196                 c.data = &dump_ctx;
6197                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6198         }
6199
6200         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6201                 return -EINVAL;
6202
6203         err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, false);
6204         if (err)
6205                 return err;
6206
6207         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6208                 err = nft_get_set_elem(&dump_ctx.ctx, dump_ctx.set, attr, false);
6209                 if (err < 0) {
6210                         NL_SET_BAD_ATTR(extack, attr);
6211                         break;
6212                 }
6213         }
6214
6215         return err;
6216 }
6217
6218 static int nf_tables_getsetelem_reset(struct sk_buff *skb,
6219                                       const struct nfnl_info *info,
6220                                       const struct nlattr * const nla[])
6221 {
6222         struct nftables_pernet *nft_net = nft_pernet(info->net);
6223         struct netlink_ext_ack *extack = info->extack;
6224         struct nft_set_dump_ctx dump_ctx;
6225         int rem, err = 0, nelems = 0;
6226         struct nlattr *attr;
6227
6228         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6229                 struct netlink_dump_control c = {
6230                         .start = nf_tables_dump_set_start,
6231                         .dump = nf_tables_dumpreset_set,
6232                         .done = nf_tables_dump_set_done,
6233                         .module = THIS_MODULE,
6234                 };
6235
6236                 err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, true);
6237                 if (err)
6238                         return err;
6239
6240                 c.data = &dump_ctx;
6241                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6242         }
6243
6244         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6245                 return -EINVAL;
6246
6247         if (!try_module_get(THIS_MODULE))
6248                 return -EINVAL;
6249         rcu_read_unlock();
6250         mutex_lock(&nft_net->commit_mutex);
6251         rcu_read_lock();
6252
6253         err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, true);
6254         if (err)
6255                 goto out_unlock;
6256
6257         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6258                 err = nft_get_set_elem(&dump_ctx.ctx, dump_ctx.set, attr, true);
6259                 if (err < 0) {
6260                         NL_SET_BAD_ATTR(extack, attr);
6261                         break;
6262                 }
6263                 nelems++;
6264         }
6265         audit_log_nft_set_reset(dump_ctx.ctx.table, nft_net->base_seq, nelems);
6266
6267 out_unlock:
6268         rcu_read_unlock();
6269         mutex_unlock(&nft_net->commit_mutex);
6270         rcu_read_lock();
6271         module_put(THIS_MODULE);
6272
6273         return err;
6274 }
6275
6276 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
6277                                      const struct nft_set *set,
6278                                      const struct nft_elem_priv *elem_priv,
6279                                      int event)
6280 {
6281         struct nftables_pernet *nft_net;
6282         struct net *net = ctx->net;
6283         u32 portid = ctx->portid;
6284         struct sk_buff *skb;
6285         u16 flags = 0;
6286         int err;
6287
6288         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6289                 return;
6290
6291         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6292         if (skb == NULL)
6293                 goto err;
6294
6295         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6296                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6297
6298         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6299                                           set, elem_priv, false);
6300         if (err < 0) {
6301                 kfree_skb(skb);
6302                 goto err;
6303         }
6304
6305         nft_net = nft_pernet(net);
6306         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6307         return;
6308 err:
6309         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6310 }
6311
6312 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6313                                               int msg_type,
6314                                               struct nft_set *set)
6315 {
6316         struct nft_trans *trans;
6317
6318         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6319         if (trans == NULL)
6320                 return NULL;
6321
6322         nft_trans_elem_set(trans) = set;
6323         return trans;
6324 }
6325
6326 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6327                                          const struct nft_set *set,
6328                                          const struct nlattr *attr)
6329 {
6330         struct nft_expr *expr;
6331         int err;
6332
6333         expr = nft_expr_init(ctx, attr);
6334         if (IS_ERR(expr))
6335                 return expr;
6336
6337         err = -EOPNOTSUPP;
6338         if (expr->ops->type->flags & NFT_EXPR_GC) {
6339                 if (set->flags & NFT_SET_TIMEOUT)
6340                         goto err_set_elem_expr;
6341                 if (!set->ops->gc_init)
6342                         goto err_set_elem_expr;
6343                 set->ops->gc_init(set);
6344         }
6345
6346         return expr;
6347
6348 err_set_elem_expr:
6349         nft_expr_destroy(ctx, expr);
6350         return ERR_PTR(err);
6351 }
6352
6353 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6354 {
6355         len += nft_set_ext_types[id].len;
6356         if (len > tmpl->ext_len[id] ||
6357             len > U8_MAX)
6358                 return -1;
6359
6360         return 0;
6361 }
6362
6363 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6364                               void *to, const void *from, u32 len)
6365 {
6366         if (nft_set_ext_check(tmpl, id, len) < 0)
6367                 return -1;
6368
6369         memcpy(to, from, len);
6370
6371         return 0;
6372 }
6373
6374 struct nft_elem_priv *nft_set_elem_init(const struct nft_set *set,
6375                                         const struct nft_set_ext_tmpl *tmpl,
6376                                         const u32 *key, const u32 *key_end,
6377                                         const u32 *data,
6378                                         u64 timeout, u64 expiration, gfp_t gfp)
6379 {
6380         struct nft_set_ext *ext;
6381         void *elem;
6382
6383         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6384         if (elem == NULL)
6385                 return ERR_PTR(-ENOMEM);
6386
6387         ext = nft_set_elem_ext(set, elem);
6388         nft_set_ext_init(ext, tmpl);
6389
6390         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6391             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6392                                nft_set_ext_key(ext), key, set->klen) < 0)
6393                 goto err_ext_check;
6394
6395         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6396             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6397                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6398                 goto err_ext_check;
6399
6400         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6401             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6402                                nft_set_ext_data(ext), data, set->dlen) < 0)
6403                 goto err_ext_check;
6404
6405         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6406                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6407                 if (expiration == 0)
6408                         *nft_set_ext_expiration(ext) += timeout;
6409         }
6410         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6411                 *nft_set_ext_timeout(ext) = timeout;
6412
6413         return elem;
6414
6415 err_ext_check:
6416         kfree(elem);
6417
6418         return ERR_PTR(-EINVAL);
6419 }
6420
6421 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6422                                         struct nft_expr *expr)
6423 {
6424         if (expr->ops->destroy_clone) {
6425                 expr->ops->destroy_clone(ctx, expr);
6426                 module_put(expr->ops->type->owner);
6427         } else {
6428                 nf_tables_expr_destroy(ctx, expr);
6429         }
6430 }
6431
6432 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6433                                       struct nft_set_elem_expr *elem_expr)
6434 {
6435         struct nft_expr *expr;
6436         u32 size;
6437
6438         nft_setelem_expr_foreach(expr, elem_expr, size)
6439                 __nft_set_elem_expr_destroy(ctx, expr);
6440 }
6441
6442 /* Drop references and destroy. Called from gc, dynset and abort path. */
6443 void nft_set_elem_destroy(const struct nft_set *set,
6444                           const struct nft_elem_priv *elem_priv,
6445                           bool destroy_expr)
6446 {
6447         struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6448         struct nft_ctx ctx = {
6449                 .net    = read_pnet(&set->net),
6450                 .family = set->table->family,
6451         };
6452
6453         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6454         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6455                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6456         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6457                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6458         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6459                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6460
6461         kfree(elem_priv);
6462 }
6463 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6464
6465 /* Destroy element. References have been already dropped in the preparation
6466  * path via nft_setelem_data_deactivate().
6467  */
6468 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6469                                 const struct nft_set *set,
6470                                 const struct nft_elem_priv *elem_priv)
6471 {
6472         struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6473
6474         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6475                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6476
6477         kfree(elem_priv);
6478 }
6479
6480 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6481                             struct nft_expr *expr_array[])
6482 {
6483         struct nft_expr *expr;
6484         int err, i, k;
6485
6486         for (i = 0; i < set->num_exprs; i++) {
6487                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6488                 if (!expr)
6489                         goto err_expr;
6490
6491                 err = nft_expr_clone(expr, set->exprs[i]);
6492                 if (err < 0) {
6493                         kfree(expr);
6494                         goto err_expr;
6495                 }
6496                 expr_array[i] = expr;
6497         }
6498
6499         return 0;
6500
6501 err_expr:
6502         for (k = i - 1; k >= 0; k--)
6503                 nft_expr_destroy(ctx, expr_array[k]);
6504
6505         return -ENOMEM;
6506 }
6507
6508 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6509                                    const struct nft_set_ext_tmpl *tmpl,
6510                                    const struct nft_set_ext *ext,
6511                                    struct nft_expr *expr_array[],
6512                                    u32 num_exprs)
6513 {
6514         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6515         u32 len = sizeof(struct nft_set_elem_expr);
6516         struct nft_expr *expr;
6517         int i, err;
6518
6519         if (num_exprs == 0)
6520                 return 0;
6521
6522         for (i = 0; i < num_exprs; i++)
6523                 len += expr_array[i]->ops->size;
6524
6525         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6526                 return -EINVAL;
6527
6528         for (i = 0; i < num_exprs; i++) {
6529                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6530                 err = nft_expr_clone(expr, expr_array[i]);
6531                 if (err < 0)
6532                         goto err_elem_expr_setup;
6533
6534                 elem_expr->size += expr_array[i]->ops->size;
6535                 nft_expr_destroy(ctx, expr_array[i]);
6536                 expr_array[i] = NULL;
6537         }
6538
6539         return 0;
6540
6541 err_elem_expr_setup:
6542         for (; i < num_exprs; i++) {
6543                 nft_expr_destroy(ctx, expr_array[i]);
6544                 expr_array[i] = NULL;
6545         }
6546
6547         return -ENOMEM;
6548 }
6549
6550 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6551                                             const struct nft_set *set)
6552 {
6553         struct nft_set_elem_catchall *catchall;
6554         u8 genmask = nft_genmask_cur(net);
6555         struct nft_set_ext *ext;
6556
6557         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6558                 ext = nft_set_elem_ext(set, catchall->elem);
6559                 if (nft_set_elem_active(ext, genmask) &&
6560                     !nft_set_elem_expired(ext) &&
6561                     !nft_set_elem_is_dead(ext))
6562                         return ext;
6563         }
6564
6565         return NULL;
6566 }
6567 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6568
6569 static int nft_setelem_catchall_insert(const struct net *net,
6570                                        struct nft_set *set,
6571                                        const struct nft_set_elem *elem,
6572                                        struct nft_elem_priv **priv)
6573 {
6574         struct nft_set_elem_catchall *catchall;
6575         u8 genmask = nft_genmask_next(net);
6576         struct nft_set_ext *ext;
6577
6578         list_for_each_entry(catchall, &set->catchall_list, list) {
6579                 ext = nft_set_elem_ext(set, catchall->elem);
6580                 if (nft_set_elem_active(ext, genmask)) {
6581                         *priv = catchall->elem;
6582                         return -EEXIST;
6583                 }
6584         }
6585
6586         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6587         if (!catchall)
6588                 return -ENOMEM;
6589
6590         catchall->elem = elem->priv;
6591         list_add_tail_rcu(&catchall->list, &set->catchall_list);
6592
6593         return 0;
6594 }
6595
6596 static int nft_setelem_insert(const struct net *net,
6597                               struct nft_set *set,
6598                               const struct nft_set_elem *elem,
6599                               struct nft_elem_priv **elem_priv,
6600                               unsigned int flags)
6601 {
6602         int ret;
6603
6604         if (flags & NFT_SET_ELEM_CATCHALL)
6605                 ret = nft_setelem_catchall_insert(net, set, elem, elem_priv);
6606         else
6607                 ret = set->ops->insert(net, set, elem, elem_priv);
6608
6609         return ret;
6610 }
6611
6612 static bool nft_setelem_is_catchall(const struct nft_set *set,
6613                                     const struct nft_elem_priv *elem_priv)
6614 {
6615         struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6616
6617         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6618             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6619                 return true;
6620
6621         return false;
6622 }
6623
6624 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6625                                  struct nft_elem_priv *elem_priv)
6626 {
6627         struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6628
6629         if (nft_setelem_is_catchall(set, elem_priv)) {
6630                 nft_set_elem_change_active(net, set, ext);
6631         } else {
6632                 set->ops->activate(net, set, elem_priv);
6633         }
6634 }
6635
6636 static int nft_setelem_catchall_deactivate(const struct net *net,
6637                                            struct nft_set *set,
6638                                            struct nft_set_elem *elem)
6639 {
6640         struct nft_set_elem_catchall *catchall;
6641         struct nft_set_ext *ext;
6642
6643         list_for_each_entry(catchall, &set->catchall_list, list) {
6644                 ext = nft_set_elem_ext(set, catchall->elem);
6645                 if (!nft_is_active_next(net, ext))
6646                         continue;
6647
6648                 kfree(elem->priv);
6649                 elem->priv = catchall->elem;
6650                 nft_set_elem_change_active(net, set, ext);
6651                 return 0;
6652         }
6653
6654         return -ENOENT;
6655 }
6656
6657 static int __nft_setelem_deactivate(const struct net *net,
6658                                     struct nft_set *set,
6659                                     struct nft_set_elem *elem)
6660 {
6661         void *priv;
6662
6663         priv = set->ops->deactivate(net, set, elem);
6664         if (!priv)
6665                 return -ENOENT;
6666
6667         kfree(elem->priv);
6668         elem->priv = priv;
6669         set->ndeact++;
6670
6671         return 0;
6672 }
6673
6674 static int nft_setelem_deactivate(const struct net *net,
6675                                   struct nft_set *set,
6676                                   struct nft_set_elem *elem, u32 flags)
6677 {
6678         int ret;
6679
6680         if (flags & NFT_SET_ELEM_CATCHALL)
6681                 ret = nft_setelem_catchall_deactivate(net, set, elem);
6682         else
6683                 ret = __nft_setelem_deactivate(net, set, elem);
6684
6685         return ret;
6686 }
6687
6688 static void nft_setelem_catchall_destroy(struct nft_set_elem_catchall *catchall)
6689 {
6690         list_del_rcu(&catchall->list);
6691         kfree_rcu(catchall, rcu);
6692 }
6693
6694 static void nft_setelem_catchall_remove(const struct net *net,
6695                                         const struct nft_set *set,
6696                                         struct nft_elem_priv *elem_priv)
6697 {
6698         struct nft_set_elem_catchall *catchall, *next;
6699
6700         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6701                 if (catchall->elem == elem_priv) {
6702                         nft_setelem_catchall_destroy(catchall);
6703                         break;
6704                 }
6705         }
6706 }
6707
6708 static void nft_setelem_remove(const struct net *net,
6709                                const struct nft_set *set,
6710                                struct nft_elem_priv *elem_priv)
6711 {
6712         if (nft_setelem_is_catchall(set, elem_priv))
6713                 nft_setelem_catchall_remove(net, set, elem_priv);
6714         else
6715                 set->ops->remove(net, set, elem_priv);
6716 }
6717
6718 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6719                                       struct nlattr **nla, u32 flags)
6720 {
6721         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6722                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6723                 if (flags & NFT_SET_ELEM_INTERVAL_END)
6724                         return false;
6725
6726                 if (nla[NFTA_SET_ELEM_KEY_END] &&
6727                     flags & NFT_SET_ELEM_CATCHALL)
6728                         return false;
6729         } else {
6730                 if (nla[NFTA_SET_ELEM_KEY_END])
6731                         return false;
6732         }
6733
6734         return true;
6735 }
6736
6737 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6738                             const struct nlattr *attr, u32 nlmsg_flags)
6739 {
6740         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6741         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6742         u8 genmask = nft_genmask_next(ctx->net);
6743         u32 flags = 0, size = 0, num_exprs = 0;
6744         struct nft_set_ext_tmpl tmpl;
6745         struct nft_set_ext *ext, *ext2;
6746         struct nft_set_elem elem;
6747         struct nft_set_binding *binding;
6748         struct nft_elem_priv *elem_priv;
6749         struct nft_object *obj = NULL;
6750         struct nft_userdata *udata;
6751         struct nft_data_desc desc;
6752         enum nft_registers dreg;
6753         struct nft_trans *trans;
6754         u64 expiration;
6755         u64 timeout;
6756         int err, i;
6757         u8 ulen;
6758
6759         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6760                                           nft_set_elem_policy, NULL);
6761         if (err < 0)
6762                 return err;
6763
6764         nft_set_ext_prepare(&tmpl);
6765
6766         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6767         if (err < 0)
6768                 return err;
6769
6770         if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6771             (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6772                 return -EINVAL;
6773
6774         if (flags != 0) {
6775                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6776                 if (err < 0)
6777                         return err;
6778         }
6779
6780         if (set->flags & NFT_SET_MAP) {
6781                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6782                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6783                         return -EINVAL;
6784         } else {
6785                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6786                         return -EINVAL;
6787         }
6788
6789         if (set->flags & NFT_SET_OBJECT) {
6790                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6791                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6792                         return -EINVAL;
6793         } else {
6794                 if (nla[NFTA_SET_ELEM_OBJREF])
6795                         return -EINVAL;
6796         }
6797
6798         if (!nft_setelem_valid_key_end(set, nla, flags))
6799                 return -EINVAL;
6800
6801         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6802              (nla[NFTA_SET_ELEM_DATA] ||
6803               nla[NFTA_SET_ELEM_OBJREF] ||
6804               nla[NFTA_SET_ELEM_TIMEOUT] ||
6805               nla[NFTA_SET_ELEM_EXPIRATION] ||
6806               nla[NFTA_SET_ELEM_USERDATA] ||
6807               nla[NFTA_SET_ELEM_EXPR] ||
6808               nla[NFTA_SET_ELEM_KEY_END] ||
6809               nla[NFTA_SET_ELEM_EXPRESSIONS]))
6810                 return -EINVAL;
6811
6812         timeout = 0;
6813         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6814                 if (!(set->flags & NFT_SET_TIMEOUT))
6815                         return -EINVAL;
6816                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6817                                             &timeout);
6818                 if (err)
6819                         return err;
6820         } else if (set->flags & NFT_SET_TIMEOUT &&
6821                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6822                 timeout = READ_ONCE(set->timeout);
6823         }
6824
6825         expiration = 0;
6826         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6827                 if (!(set->flags & NFT_SET_TIMEOUT))
6828                         return -EINVAL;
6829                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6830                                             &expiration);
6831                 if (err)
6832                         return err;
6833         }
6834
6835         if (nla[NFTA_SET_ELEM_EXPR]) {
6836                 struct nft_expr *expr;
6837
6838                 if (set->num_exprs && set->num_exprs != 1)
6839                         return -EOPNOTSUPP;
6840
6841                 expr = nft_set_elem_expr_alloc(ctx, set,
6842                                                nla[NFTA_SET_ELEM_EXPR]);
6843                 if (IS_ERR(expr))
6844                         return PTR_ERR(expr);
6845
6846                 expr_array[0] = expr;
6847                 num_exprs = 1;
6848
6849                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6850                         err = -EOPNOTSUPP;
6851                         goto err_set_elem_expr;
6852                 }
6853         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6854                 struct nft_expr *expr;
6855                 struct nlattr *tmp;
6856                 int left;
6857
6858                 i = 0;
6859                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6860                         if (i == NFT_SET_EXPR_MAX ||
6861                             (set->num_exprs && set->num_exprs == i)) {
6862                                 err = -E2BIG;
6863                                 goto err_set_elem_expr;
6864                         }
6865                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6866                                 err = -EINVAL;
6867                                 goto err_set_elem_expr;
6868                         }
6869                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6870                         if (IS_ERR(expr)) {
6871                                 err = PTR_ERR(expr);
6872                                 goto err_set_elem_expr;
6873                         }
6874                         expr_array[i] = expr;
6875                         num_exprs++;
6876
6877                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6878                                 err = -EOPNOTSUPP;
6879                                 goto err_set_elem_expr;
6880                         }
6881                         i++;
6882                 }
6883                 if (set->num_exprs && set->num_exprs != i) {
6884                         err = -EOPNOTSUPP;
6885                         goto err_set_elem_expr;
6886                 }
6887         } else if (set->num_exprs > 0 &&
6888                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6889                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6890                 if (err < 0)
6891                         goto err_set_elem_expr_clone;
6892
6893                 num_exprs = set->num_exprs;
6894         }
6895
6896         if (nla[NFTA_SET_ELEM_KEY]) {
6897                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6898                                             nla[NFTA_SET_ELEM_KEY]);
6899                 if (err < 0)
6900                         goto err_set_elem_expr;
6901
6902                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6903                 if (err < 0)
6904                         goto err_parse_key;
6905         }
6906
6907         if (nla[NFTA_SET_ELEM_KEY_END]) {
6908                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6909                                             nla[NFTA_SET_ELEM_KEY_END]);
6910                 if (err < 0)
6911                         goto err_parse_key;
6912
6913                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6914                 if (err < 0)
6915                         goto err_parse_key_end;
6916         }
6917
6918         if (timeout > 0) {
6919                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6920                 if (err < 0)
6921                         goto err_parse_key_end;
6922
6923                 if (timeout != READ_ONCE(set->timeout)) {
6924                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6925                         if (err < 0)
6926                                 goto err_parse_key_end;
6927                 }
6928         }
6929
6930         if (num_exprs) {
6931                 for (i = 0; i < num_exprs; i++)
6932                         size += expr_array[i]->ops->size;
6933
6934                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6935                                              sizeof(struct nft_set_elem_expr) + size);
6936                 if (err < 0)
6937                         goto err_parse_key_end;
6938         }
6939
6940         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6941                 obj = nft_obj_lookup(ctx->net, ctx->table,
6942                                      nla[NFTA_SET_ELEM_OBJREF],
6943                                      set->objtype, genmask);
6944                 if (IS_ERR(obj)) {
6945                         err = PTR_ERR(obj);
6946                         obj = NULL;
6947                         goto err_parse_key_end;
6948                 }
6949
6950                 if (!nft_use_inc(&obj->use)) {
6951                         err = -EMFILE;
6952                         obj = NULL;
6953                         goto err_parse_key_end;
6954                 }
6955
6956                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6957                 if (err < 0)
6958                         goto err_parse_key_end;
6959         }
6960
6961         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6962                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6963                                              nla[NFTA_SET_ELEM_DATA]);
6964                 if (err < 0)
6965                         goto err_parse_key_end;
6966
6967                 dreg = nft_type_to_reg(set->dtype);
6968                 list_for_each_entry(binding, &set->bindings, list) {
6969                         struct nft_ctx bind_ctx = {
6970                                 .net    = ctx->net,
6971                                 .family = ctx->family,
6972                                 .table  = ctx->table,
6973                                 .chain  = (struct nft_chain *)binding->chain,
6974                         };
6975
6976                         if (!(binding->flags & NFT_SET_MAP))
6977                                 continue;
6978
6979                         err = nft_validate_register_store(&bind_ctx, dreg,
6980                                                           &elem.data.val,
6981                                                           desc.type, desc.len);
6982                         if (err < 0)
6983                                 goto err_parse_data;
6984
6985                         if (desc.type == NFT_DATA_VERDICT &&
6986                             (elem.data.val.verdict.code == NFT_GOTO ||
6987                              elem.data.val.verdict.code == NFT_JUMP))
6988                                 nft_validate_state_update(ctx->table,
6989                                                           NFT_VALIDATE_NEED);
6990                 }
6991
6992                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6993                 if (err < 0)
6994                         goto err_parse_data;
6995         }
6996
6997         /* The full maximum length of userdata can exceed the maximum
6998          * offset value (U8_MAX) for following extensions, therefor it
6999          * must be the last extension added.
7000          */
7001         ulen = 0;
7002         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
7003                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
7004                 if (ulen > 0) {
7005                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
7006                                                      ulen);
7007                         if (err < 0)
7008                                 goto err_parse_data;
7009                 }
7010         }
7011
7012         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7013                                       elem.key_end.val.data, elem.data.val.data,
7014                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
7015         if (IS_ERR(elem.priv)) {
7016                 err = PTR_ERR(elem.priv);
7017                 goto err_parse_data;
7018         }
7019
7020         ext = nft_set_elem_ext(set, elem.priv);
7021         if (flags)
7022                 *nft_set_ext_flags(ext) = flags;
7023
7024         if (obj)
7025                 *nft_set_ext_obj(ext) = obj;
7026
7027         if (ulen > 0) {
7028                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
7029                         err = -EINVAL;
7030                         goto err_elem_free;
7031                 }
7032                 udata = nft_set_ext_userdata(ext);
7033                 udata->len = ulen - 1;
7034                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
7035         }
7036         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
7037         if (err < 0)
7038                 goto err_elem_free;
7039
7040         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
7041         if (trans == NULL) {
7042                 err = -ENOMEM;
7043                 goto err_elem_free;
7044         }
7045
7046         ext->genmask = nft_genmask_cur(ctx->net);
7047
7048         err = nft_setelem_insert(ctx->net, set, &elem, &elem_priv, flags);
7049         if (err) {
7050                 if (err == -EEXIST) {
7051                         ext2 = nft_set_elem_ext(set, elem_priv);
7052                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
7053                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
7054                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
7055                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
7056                                 goto err_element_clash;
7057                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
7058                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
7059                              memcmp(nft_set_ext_data(ext),
7060                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
7061                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
7062                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
7063                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
7064                                 goto err_element_clash;
7065                         else if (!(nlmsg_flags & NLM_F_EXCL))
7066                                 err = 0;
7067                 } else if (err == -ENOTEMPTY) {
7068                         /* ENOTEMPTY reports overlapping between this element
7069                          * and an existing one.
7070                          */
7071                         err = -EEXIST;
7072                 }
7073                 goto err_element_clash;
7074         }
7075
7076         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
7077                 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
7078
7079                 if (!atomic_add_unless(&set->nelems, 1, max)) {
7080                         err = -ENFILE;
7081                         goto err_set_full;
7082                 }
7083         }
7084
7085         nft_trans_elem_priv(trans) = elem.priv;
7086         nft_trans_commit_list_add_tail(ctx->net, trans);
7087         return 0;
7088
7089 err_set_full:
7090         nft_setelem_remove(ctx->net, set, elem.priv);
7091 err_element_clash:
7092         kfree(trans);
7093 err_elem_free:
7094         nf_tables_set_elem_destroy(ctx, set, elem.priv);
7095 err_parse_data:
7096         if (nla[NFTA_SET_ELEM_DATA] != NULL)
7097                 nft_data_release(&elem.data.val, desc.type);
7098 err_parse_key_end:
7099         if (obj)
7100                 nft_use_dec_restore(&obj->use);
7101
7102         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7103 err_parse_key:
7104         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7105 err_set_elem_expr:
7106         for (i = 0; i < num_exprs && expr_array[i]; i++)
7107                 nft_expr_destroy(ctx, expr_array[i]);
7108 err_set_elem_expr_clone:
7109         return err;
7110 }
7111
7112 static int nf_tables_newsetelem(struct sk_buff *skb,
7113                                 const struct nfnl_info *info,
7114                                 const struct nlattr * const nla[])
7115 {
7116         struct netlink_ext_ack *extack = info->extack;
7117         u8 genmask = nft_genmask_next(info->net);
7118         u8 family = info->nfmsg->nfgen_family;
7119         struct net *net = info->net;
7120         const struct nlattr *attr;
7121         struct nft_table *table;
7122         struct nft_set *set;
7123         struct nft_ctx ctx;
7124         int rem, err;
7125
7126         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
7127                 return -EINVAL;
7128
7129         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7130                                  genmask, NETLINK_CB(skb).portid);
7131         if (IS_ERR(table)) {
7132                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7133                 return PTR_ERR(table);
7134         }
7135
7136         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
7137                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
7138         if (IS_ERR(set)) {
7139                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
7140                 return PTR_ERR(set);
7141         }
7142
7143         if (!list_empty(&set->bindings) &&
7144             (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
7145                 return -EBUSY;
7146
7147         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7148
7149         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7150                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
7151                 if (err < 0) {
7152                         NL_SET_BAD_ATTR(extack, attr);
7153                         return err;
7154                 }
7155         }
7156
7157         if (table->validate_state == NFT_VALIDATE_DO)
7158                 return nft_table_validate(net, table);
7159
7160         return 0;
7161 }
7162
7163 /**
7164  *      nft_data_hold - hold a nft_data item
7165  *
7166  *      @data: struct nft_data to release
7167  *      @type: type of data
7168  *
7169  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7170  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
7171  *      NFT_GOTO verdicts. This function must be called on active data objects
7172  *      from the second phase of the commit protocol.
7173  */
7174 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
7175 {
7176         struct nft_chain *chain;
7177
7178         if (type == NFT_DATA_VERDICT) {
7179                 switch (data->verdict.code) {
7180                 case NFT_JUMP:
7181                 case NFT_GOTO:
7182                         chain = data->verdict.chain;
7183                         nft_use_inc_restore(&chain->use);
7184                         break;
7185                 }
7186         }
7187 }
7188
7189 static void nft_setelem_data_activate(const struct net *net,
7190                                       const struct nft_set *set,
7191                                       struct nft_elem_priv *elem_priv)
7192 {
7193         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
7194
7195         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7196                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
7197         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7198                 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
7199 }
7200
7201 void nft_setelem_data_deactivate(const struct net *net,
7202                                  const struct nft_set *set,
7203                                  struct nft_elem_priv *elem_priv)
7204 {
7205         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
7206
7207         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7208                 nft_data_release(nft_set_ext_data(ext), set->dtype);
7209         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7210                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
7211 }
7212
7213 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
7214                            const struct nlattr *attr)
7215 {
7216         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
7217         struct nft_set_ext_tmpl tmpl;
7218         struct nft_set_elem elem;
7219         struct nft_set_ext *ext;
7220         struct nft_trans *trans;
7221         u32 flags = 0;
7222         int err;
7223
7224         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
7225                                           nft_set_elem_policy, NULL);
7226         if (err < 0)
7227                 return err;
7228
7229         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
7230         if (err < 0)
7231                 return err;
7232
7233         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
7234                 return -EINVAL;
7235
7236         if (!nft_setelem_valid_key_end(set, nla, flags))
7237                 return -EINVAL;
7238
7239         nft_set_ext_prepare(&tmpl);
7240
7241         if (flags != 0) {
7242                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
7243                 if (err < 0)
7244                         return err;
7245         }
7246
7247         if (nla[NFTA_SET_ELEM_KEY]) {
7248                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
7249                                             nla[NFTA_SET_ELEM_KEY]);
7250                 if (err < 0)
7251                         return err;
7252
7253                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7254                 if (err < 0)
7255                         goto fail_elem;
7256         }
7257
7258         if (nla[NFTA_SET_ELEM_KEY_END]) {
7259                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
7260                                             nla[NFTA_SET_ELEM_KEY_END]);
7261                 if (err < 0)
7262                         goto fail_elem;
7263
7264                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
7265                 if (err < 0)
7266                         goto fail_elem_key_end;
7267         }
7268
7269         err = -ENOMEM;
7270         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7271                                       elem.key_end.val.data, NULL, 0, 0,
7272                                       GFP_KERNEL_ACCOUNT);
7273         if (IS_ERR(elem.priv)) {
7274                 err = PTR_ERR(elem.priv);
7275                 goto fail_elem_key_end;
7276         }
7277
7278         ext = nft_set_elem_ext(set, elem.priv);
7279         if (flags)
7280                 *nft_set_ext_flags(ext) = flags;
7281
7282         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7283         if (trans == NULL)
7284                 goto fail_trans;
7285
7286         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7287         if (err < 0)
7288                 goto fail_ops;
7289
7290         nft_setelem_data_deactivate(ctx->net, set, elem.priv);
7291
7292         nft_trans_elem_priv(trans) = elem.priv;
7293         nft_trans_commit_list_add_tail(ctx->net, trans);
7294         return 0;
7295
7296 fail_ops:
7297         kfree(trans);
7298 fail_trans:
7299         kfree(elem.priv);
7300 fail_elem_key_end:
7301         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7302 fail_elem:
7303         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7304         return err;
7305 }
7306
7307 static int nft_setelem_flush(const struct nft_ctx *ctx,
7308                              struct nft_set *set,
7309                              const struct nft_set_iter *iter,
7310                              struct nft_elem_priv *elem_priv)
7311 {
7312         struct nft_trans *trans;
7313
7314         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7315                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
7316         if (!trans)
7317                 return -ENOMEM;
7318
7319         set->ops->flush(ctx->net, set, elem_priv);
7320         set->ndeact++;
7321
7322         nft_setelem_data_deactivate(ctx->net, set, elem_priv);
7323         nft_trans_elem_set(trans) = set;
7324         nft_trans_elem_priv(trans) = elem_priv;
7325         nft_trans_commit_list_add_tail(ctx->net, trans);
7326
7327         return 0;
7328 }
7329
7330 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7331                                     struct nft_set *set,
7332                                     struct nft_elem_priv *elem_priv)
7333 {
7334         struct nft_trans *trans;
7335
7336         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7337                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
7338         if (!trans)
7339                 return -ENOMEM;
7340
7341         nft_setelem_data_deactivate(ctx->net, set, elem_priv);
7342         nft_trans_elem_set(trans) = set;
7343         nft_trans_elem_priv(trans) = elem_priv;
7344         nft_trans_commit_list_add_tail(ctx->net, trans);
7345
7346         return 0;
7347 }
7348
7349 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7350                                   struct nft_set *set)
7351 {
7352         u8 genmask = nft_genmask_next(ctx->net);
7353         struct nft_set_elem_catchall *catchall;
7354         struct nft_set_ext *ext;
7355         int ret = 0;
7356
7357         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7358                 ext = nft_set_elem_ext(set, catchall->elem);
7359                 if (!nft_set_elem_active(ext, genmask))
7360                         continue;
7361
7362                 ret = __nft_set_catchall_flush(ctx, set, catchall->elem);
7363                 if (ret < 0)
7364                         break;
7365                 nft_set_elem_change_active(ctx->net, set, ext);
7366         }
7367
7368         return ret;
7369 }
7370
7371 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7372 {
7373         struct nft_set_iter iter = {
7374                 .genmask        = genmask,
7375                 .fn             = nft_setelem_flush,
7376         };
7377
7378         set->ops->walk(ctx, set, &iter);
7379         if (!iter.err)
7380                 iter.err = nft_set_catchall_flush(ctx, set);
7381
7382         return iter.err;
7383 }
7384
7385 static int nf_tables_delsetelem(struct sk_buff *skb,
7386                                 const struct nfnl_info *info,
7387                                 const struct nlattr * const nla[])
7388 {
7389         struct netlink_ext_ack *extack = info->extack;
7390         u8 genmask = nft_genmask_next(info->net);
7391         u8 family = info->nfmsg->nfgen_family;
7392         struct net *net = info->net;
7393         const struct nlattr *attr;
7394         struct nft_table *table;
7395         struct nft_set *set;
7396         struct nft_ctx ctx;
7397         int rem, err = 0;
7398
7399         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7400                                  genmask, NETLINK_CB(skb).portid);
7401         if (IS_ERR(table)) {
7402                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7403                 return PTR_ERR(table);
7404         }
7405
7406         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7407         if (IS_ERR(set)) {
7408                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
7409                 return PTR_ERR(set);
7410         }
7411
7412         if (nft_set_is_anonymous(set))
7413                 return -EOPNOTSUPP;
7414
7415         if (!list_empty(&set->bindings) && (set->flags & NFT_SET_CONSTANT))
7416                 return -EBUSY;
7417
7418         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7419
7420         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7421                 return nft_set_flush(&ctx, set, genmask);
7422
7423         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7424                 err = nft_del_setelem(&ctx, set, attr);
7425                 if (err == -ENOENT &&
7426                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7427                         continue;
7428
7429                 if (err < 0) {
7430                         NL_SET_BAD_ATTR(extack, attr);
7431                         return err;
7432                 }
7433         }
7434
7435         return 0;
7436 }
7437
7438 /*
7439  * Stateful objects
7440  */
7441
7442 /**
7443  *      nft_register_obj- register nf_tables stateful object type
7444  *      @obj_type: object type
7445  *
7446  *      Registers the object type for use with nf_tables. Returns zero on
7447  *      success or a negative errno code otherwise.
7448  */
7449 int nft_register_obj(struct nft_object_type *obj_type)
7450 {
7451         if (obj_type->type == NFT_OBJECT_UNSPEC)
7452                 return -EINVAL;
7453
7454         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7455         list_add_rcu(&obj_type->list, &nf_tables_objects);
7456         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7457         return 0;
7458 }
7459 EXPORT_SYMBOL_GPL(nft_register_obj);
7460
7461 /**
7462  *      nft_unregister_obj - unregister nf_tables object type
7463  *      @obj_type: object type
7464  *
7465  *      Unregisters the object type for use with nf_tables.
7466  */
7467 void nft_unregister_obj(struct nft_object_type *obj_type)
7468 {
7469         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7470         list_del_rcu(&obj_type->list);
7471         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7472 }
7473 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7474
7475 struct nft_object *nft_obj_lookup(const struct net *net,
7476                                   const struct nft_table *table,
7477                                   const struct nlattr *nla, u32 objtype,
7478                                   u8 genmask)
7479 {
7480         struct nft_object_hash_key k = { .table = table };
7481         char search[NFT_OBJ_MAXNAMELEN];
7482         struct rhlist_head *tmp, *list;
7483         struct nft_object *obj;
7484
7485         nla_strscpy(search, nla, sizeof(search));
7486         k.name = search;
7487
7488         WARN_ON_ONCE(!rcu_read_lock_held() &&
7489                      !lockdep_commit_lock_is_held(net));
7490
7491         rcu_read_lock();
7492         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7493         if (!list)
7494                 goto out;
7495
7496         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7497                 if (objtype == obj->ops->type->type &&
7498                     nft_active_genmask(obj, genmask)) {
7499                         rcu_read_unlock();
7500                         return obj;
7501                 }
7502         }
7503 out:
7504         rcu_read_unlock();
7505         return ERR_PTR(-ENOENT);
7506 }
7507 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7508
7509 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7510                                                   const struct nlattr *nla,
7511                                                   u32 objtype, u8 genmask)
7512 {
7513         struct nft_object *obj;
7514
7515         list_for_each_entry(obj, &table->objects, list) {
7516                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7517                     objtype == obj->ops->type->type &&
7518                     nft_active_genmask(obj, genmask))
7519                         return obj;
7520         }
7521         return ERR_PTR(-ENOENT);
7522 }
7523
7524 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7525         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
7526                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
7527         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
7528                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
7529         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
7530         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
7531         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
7532         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
7533                                     .len = NFT_USERDATA_MAXLEN },
7534 };
7535
7536 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7537                                        const struct nft_object_type *type,
7538                                        const struct nlattr *attr)
7539 {
7540         struct nlattr **tb;
7541         const struct nft_object_ops *ops;
7542         struct nft_object *obj;
7543         int err = -ENOMEM;
7544
7545         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7546         if (!tb)
7547                 goto err1;
7548
7549         if (attr) {
7550                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7551                                                   type->policy, NULL);
7552                 if (err < 0)
7553                         goto err2;
7554         } else {
7555                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7556         }
7557
7558         if (type->select_ops) {
7559                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7560                 if (IS_ERR(ops)) {
7561                         err = PTR_ERR(ops);
7562                         goto err2;
7563                 }
7564         } else {
7565                 ops = type->ops;
7566         }
7567
7568         err = -ENOMEM;
7569         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7570         if (!obj)
7571                 goto err2;
7572
7573         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7574         if (err < 0)
7575                 goto err3;
7576
7577         obj->ops = ops;
7578
7579         kfree(tb);
7580         return obj;
7581 err3:
7582         kfree(obj);
7583 err2:
7584         kfree(tb);
7585 err1:
7586         return ERR_PTR(err);
7587 }
7588
7589 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7590                            struct nft_object *obj, bool reset)
7591 {
7592         struct nlattr *nest;
7593
7594         nest = nla_nest_start_noflag(skb, attr);
7595         if (!nest)
7596                 goto nla_put_failure;
7597         if (obj->ops->dump(skb, obj, reset) < 0)
7598                 goto nla_put_failure;
7599         nla_nest_end(skb, nest);
7600         return 0;
7601
7602 nla_put_failure:
7603         return -1;
7604 }
7605
7606 static const struct nft_object_type *__nft_obj_type_get(u32 objtype, u8 family)
7607 {
7608         const struct nft_object_type *type;
7609
7610         list_for_each_entry(type, &nf_tables_objects, list) {
7611                 if (type->family != NFPROTO_UNSPEC &&
7612                     type->family != family)
7613                         continue;
7614
7615                 if (objtype == type->type)
7616                         return type;
7617         }
7618         return NULL;
7619 }
7620
7621 static const struct nft_object_type *
7622 nft_obj_type_get(struct net *net, u32 objtype, u8 family)
7623 {
7624         const struct nft_object_type *type;
7625
7626         type = __nft_obj_type_get(objtype, family);
7627         if (type != NULL && try_module_get(type->owner))
7628                 return type;
7629
7630         lockdep_nfnl_nft_mutex_not_held();
7631 #ifdef CONFIG_MODULES
7632         if (type == NULL) {
7633                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7634                         return ERR_PTR(-EAGAIN);
7635         }
7636 #endif
7637         return ERR_PTR(-ENOENT);
7638 }
7639
7640 static int nf_tables_updobj(const struct nft_ctx *ctx,
7641                             const struct nft_object_type *type,
7642                             const struct nlattr *attr,
7643                             struct nft_object *obj)
7644 {
7645         struct nft_object *newobj;
7646         struct nft_trans *trans;
7647         int err = -ENOMEM;
7648
7649         if (!try_module_get(type->owner))
7650                 return -ENOENT;
7651
7652         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7653                                 sizeof(struct nft_trans_obj));
7654         if (!trans)
7655                 goto err_trans;
7656
7657         newobj = nft_obj_init(ctx, type, attr);
7658         if (IS_ERR(newobj)) {
7659                 err = PTR_ERR(newobj);
7660                 goto err_free_trans;
7661         }
7662
7663         nft_trans_obj(trans) = obj;
7664         nft_trans_obj_update(trans) = true;
7665         nft_trans_obj_newobj(trans) = newobj;
7666         nft_trans_commit_list_add_tail(ctx->net, trans);
7667
7668         return 0;
7669
7670 err_free_trans:
7671         kfree(trans);
7672 err_trans:
7673         module_put(type->owner);
7674         return err;
7675 }
7676
7677 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7678                             const struct nlattr * const nla[])
7679 {
7680         struct netlink_ext_ack *extack = info->extack;
7681         u8 genmask = nft_genmask_next(info->net);
7682         u8 family = info->nfmsg->nfgen_family;
7683         const struct nft_object_type *type;
7684         struct net *net = info->net;
7685         struct nft_table *table;
7686         struct nft_object *obj;
7687         struct nft_ctx ctx;
7688         u32 objtype;
7689         int err;
7690
7691         if (!nla[NFTA_OBJ_TYPE] ||
7692             !nla[NFTA_OBJ_NAME] ||
7693             !nla[NFTA_OBJ_DATA])
7694                 return -EINVAL;
7695
7696         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7697                                  NETLINK_CB(skb).portid);
7698         if (IS_ERR(table)) {
7699                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7700                 return PTR_ERR(table);
7701         }
7702
7703         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7704         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7705         if (IS_ERR(obj)) {
7706                 err = PTR_ERR(obj);
7707                 if (err != -ENOENT) {
7708                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7709                         return err;
7710                 }
7711         } else {
7712                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7713                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7714                         return -EEXIST;
7715                 }
7716                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7717                         return -EOPNOTSUPP;
7718
7719                 type = __nft_obj_type_get(objtype, family);
7720                 if (WARN_ON_ONCE(!type))
7721                         return -ENOENT;
7722
7723                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7724
7725                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7726         }
7727
7728         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7729
7730         if (!nft_use_inc(&table->use))
7731                 return -EMFILE;
7732
7733         type = nft_obj_type_get(net, objtype, family);
7734         if (IS_ERR(type)) {
7735                 err = PTR_ERR(type);
7736                 goto err_type;
7737         }
7738
7739         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7740         if (IS_ERR(obj)) {
7741                 err = PTR_ERR(obj);
7742                 goto err_init;
7743         }
7744         obj->key.table = table;
7745         obj->handle = nf_tables_alloc_handle(table);
7746
7747         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7748         if (!obj->key.name) {
7749                 err = -ENOMEM;
7750                 goto err_strdup;
7751         }
7752
7753         if (nla[NFTA_OBJ_USERDATA]) {
7754                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7755                 if (obj->udata == NULL)
7756                         goto err_userdata;
7757
7758                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7759         }
7760
7761         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7762         if (err < 0)
7763                 goto err_trans;
7764
7765         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7766                               nft_objname_ht_params);
7767         if (err < 0)
7768                 goto err_obj_ht;
7769
7770         list_add_tail_rcu(&obj->list, &table->objects);
7771
7772         return 0;
7773 err_obj_ht:
7774         /* queued in transaction log */
7775         INIT_LIST_HEAD(&obj->list);
7776         return err;
7777 err_trans:
7778         kfree(obj->udata);
7779 err_userdata:
7780         kfree(obj->key.name);
7781 err_strdup:
7782         if (obj->ops->destroy)
7783                 obj->ops->destroy(&ctx, obj);
7784         kfree(obj);
7785 err_init:
7786         module_put(type->owner);
7787 err_type:
7788         nft_use_dec_restore(&table->use);
7789
7790         return err;
7791 }
7792
7793 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7794                                    u32 portid, u32 seq, int event, u32 flags,
7795                                    int family, const struct nft_table *table,
7796                                    struct nft_object *obj, bool reset)
7797 {
7798         struct nlmsghdr *nlh;
7799
7800         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7801         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7802                            NFNETLINK_V0, nft_base_seq(net));
7803         if (!nlh)
7804                 goto nla_put_failure;
7805
7806         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7807             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7808             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7809                          NFTA_OBJ_PAD))
7810                 goto nla_put_failure;
7811
7812         if (event == NFT_MSG_DELOBJ) {
7813                 nlmsg_end(skb, nlh);
7814                 return 0;
7815         }
7816
7817         if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7818             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7819             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7820                 goto nla_put_failure;
7821
7822         if (obj->udata &&
7823             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7824                 goto nla_put_failure;
7825
7826         nlmsg_end(skb, nlh);
7827         return 0;
7828
7829 nla_put_failure:
7830         nlmsg_trim(skb, nlh);
7831         return -1;
7832 }
7833
7834 static void audit_log_obj_reset(const struct nft_table *table,
7835                                 unsigned int base_seq, unsigned int nentries)
7836 {
7837         char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
7838
7839         audit_log_nfcfg(buf, table->family, nentries,
7840                         AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
7841         kfree(buf);
7842 }
7843
7844 struct nft_obj_dump_ctx {
7845         unsigned int    s_idx;
7846         char            *table;
7847         u32             type;
7848         bool            reset;
7849 };
7850
7851 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7852 {
7853         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7854         struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7855         struct net *net = sock_net(skb->sk);
7856         int family = nfmsg->nfgen_family;
7857         struct nftables_pernet *nft_net;
7858         const struct nft_table *table;
7859         unsigned int entries = 0;
7860         struct nft_object *obj;
7861         unsigned int idx = 0;
7862         int rc = 0;
7863
7864         rcu_read_lock();
7865         nft_net = nft_pernet(net);
7866         cb->seq = READ_ONCE(nft_net->base_seq);
7867
7868         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7869                 if (family != NFPROTO_UNSPEC && family != table->family)
7870                         continue;
7871
7872                 entries = 0;
7873                 list_for_each_entry_rcu(obj, &table->objects, list) {
7874                         if (!nft_is_active(net, obj))
7875                                 goto cont;
7876                         if (idx < ctx->s_idx)
7877                                 goto cont;
7878                         if (ctx->table && strcmp(ctx->table, table->name))
7879                                 goto cont;
7880                         if (ctx->type != NFT_OBJECT_UNSPEC &&
7881                             obj->ops->type->type != ctx->type)
7882                                 goto cont;
7883
7884                         rc = nf_tables_fill_obj_info(skb, net,
7885                                                      NETLINK_CB(cb->skb).portid,
7886                                                      cb->nlh->nlmsg_seq,
7887                                                      NFT_MSG_NEWOBJ,
7888                                                      NLM_F_MULTI | NLM_F_APPEND,
7889                                                      table->family, table,
7890                                                      obj, ctx->reset);
7891                         if (rc < 0)
7892                                 break;
7893
7894                         entries++;
7895                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7896 cont:
7897                         idx++;
7898                 }
7899                 if (ctx->reset && entries)
7900                         audit_log_obj_reset(table, nft_net->base_seq, entries);
7901                 if (rc < 0)
7902                         break;
7903         }
7904         rcu_read_unlock();
7905
7906         ctx->s_idx = idx;
7907         return skb->len;
7908 }
7909
7910 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7911 {
7912         struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7913         const struct nlattr * const *nla = cb->data;
7914
7915         BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
7916
7917         if (nla[NFTA_OBJ_TABLE]) {
7918                 ctx->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7919                 if (!ctx->table)
7920                         return -ENOMEM;
7921         }
7922
7923         if (nla[NFTA_OBJ_TYPE])
7924                 ctx->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7925
7926         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7927                 ctx->reset = true;
7928
7929         return 0;
7930 }
7931
7932 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7933 {
7934         struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7935
7936         kfree(ctx->table);
7937
7938         return 0;
7939 }
7940
7941 /* called with rcu_read_lock held */
7942 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7943                             const struct nlattr * const nla[])
7944 {
7945         struct netlink_ext_ack *extack = info->extack;
7946         u8 genmask = nft_genmask_cur(info->net);
7947         u8 family = info->nfmsg->nfgen_family;
7948         const struct nft_table *table;
7949         struct net *net = info->net;
7950         struct nft_object *obj;
7951         struct sk_buff *skb2;
7952         bool reset = false;
7953         u32 objtype;
7954         int err;
7955
7956         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7957                 struct netlink_dump_control c = {
7958                         .start = nf_tables_dump_obj_start,
7959                         .dump = nf_tables_dump_obj,
7960                         .done = nf_tables_dump_obj_done,
7961                         .module = THIS_MODULE,
7962                         .data = (void *)nla,
7963                 };
7964
7965                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7966         }
7967
7968         if (!nla[NFTA_OBJ_NAME] ||
7969             !nla[NFTA_OBJ_TYPE])
7970                 return -EINVAL;
7971
7972         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7973         if (IS_ERR(table)) {
7974                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7975                 return PTR_ERR(table);
7976         }
7977
7978         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7979         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7980         if (IS_ERR(obj)) {
7981                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7982                 return PTR_ERR(obj);
7983         }
7984
7985         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7986         if (!skb2)
7987                 return -ENOMEM;
7988
7989         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7990                 reset = true;
7991
7992         if (reset) {
7993                 const struct nftables_pernet *nft_net;
7994                 char *buf;
7995
7996                 nft_net = nft_pernet(net);
7997                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7998
7999                 audit_log_nfcfg(buf,
8000                                 family,
8001                                 1,
8002                                 AUDIT_NFT_OP_OBJ_RESET,
8003                                 GFP_ATOMIC);
8004                 kfree(buf);
8005         }
8006
8007         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
8008                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
8009                                       family, table, obj, reset);
8010         if (err < 0)
8011                 goto err_fill_obj_info;
8012
8013         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8014
8015 err_fill_obj_info:
8016         kfree_skb(skb2);
8017         return err;
8018 }
8019
8020 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
8021 {
8022         if (obj->ops->destroy)
8023                 obj->ops->destroy(ctx, obj);
8024
8025         module_put(obj->ops->type->owner);
8026         kfree(obj->key.name);
8027         kfree(obj->udata);
8028         kfree(obj);
8029 }
8030
8031 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
8032                             const struct nlattr * const nla[])
8033 {
8034         struct netlink_ext_ack *extack = info->extack;
8035         u8 genmask = nft_genmask_next(info->net);
8036         u8 family = info->nfmsg->nfgen_family;
8037         struct net *net = info->net;
8038         const struct nlattr *attr;
8039         struct nft_table *table;
8040         struct nft_object *obj;
8041         struct nft_ctx ctx;
8042         u32 objtype;
8043
8044         if (!nla[NFTA_OBJ_TYPE] ||
8045             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
8046                 return -EINVAL;
8047
8048         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
8049                                  NETLINK_CB(skb).portid);
8050         if (IS_ERR(table)) {
8051                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
8052                 return PTR_ERR(table);
8053         }
8054
8055         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
8056         if (nla[NFTA_OBJ_HANDLE]) {
8057                 attr = nla[NFTA_OBJ_HANDLE];
8058                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
8059         } else {
8060                 attr = nla[NFTA_OBJ_NAME];
8061                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
8062         }
8063
8064         if (IS_ERR(obj)) {
8065                 if (PTR_ERR(obj) == -ENOENT &&
8066                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
8067                         return 0;
8068
8069                 NL_SET_BAD_ATTR(extack, attr);
8070                 return PTR_ERR(obj);
8071         }
8072         if (obj->use > 0) {
8073                 NL_SET_BAD_ATTR(extack, attr);
8074                 return -EBUSY;
8075         }
8076
8077         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8078
8079         return nft_delobj(&ctx, obj);
8080 }
8081
8082 static void
8083 __nft_obj_notify(struct net *net, const struct nft_table *table,
8084                  struct nft_object *obj, u32 portid, u32 seq, int event,
8085                  u16 flags, int family, int report, gfp_t gfp)
8086 {
8087         struct nftables_pernet *nft_net = nft_pernet(net);
8088         struct sk_buff *skb;
8089         int err;
8090
8091         if (!report &&
8092             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8093                 return;
8094
8095         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
8096         if (skb == NULL)
8097                 goto err;
8098
8099         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
8100                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
8101                                       family, table, obj, false);
8102         if (err < 0) {
8103                 kfree_skb(skb);
8104                 goto err;
8105         }
8106
8107         nft_notify_enqueue(skb, report, &nft_net->notify_list);
8108         return;
8109 err:
8110         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
8111 }
8112
8113 void nft_obj_notify(struct net *net, const struct nft_table *table,
8114                     struct nft_object *obj, u32 portid, u32 seq, int event,
8115                     u16 flags, int family, int report, gfp_t gfp)
8116 {
8117         struct nftables_pernet *nft_net = nft_pernet(net);
8118         char *buf = kasprintf(gfp, "%s:%u",
8119                               table->name, nft_net->base_seq);
8120
8121         audit_log_nfcfg(buf,
8122                         family,
8123                         obj->handle,
8124                         event == NFT_MSG_NEWOBJ ?
8125                                  AUDIT_NFT_OP_OBJ_REGISTER :
8126                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
8127                         gfp);
8128         kfree(buf);
8129
8130         __nft_obj_notify(net, table, obj, portid, seq, event,
8131                          flags, family, report, gfp);
8132 }
8133 EXPORT_SYMBOL_GPL(nft_obj_notify);
8134
8135 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
8136                                  struct nft_object *obj, int event)
8137 {
8138         __nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
8139                          ctx->seq, event, ctx->flags, ctx->family,
8140                          ctx->report, GFP_KERNEL);
8141 }
8142
8143 /*
8144  * Flow tables
8145  */
8146 void nft_register_flowtable_type(struct nf_flowtable_type *type)
8147 {
8148         nfnl_lock(NFNL_SUBSYS_NFTABLES);
8149         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
8150         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8151 }
8152 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
8153
8154 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
8155 {
8156         nfnl_lock(NFNL_SUBSYS_NFTABLES);
8157         list_del_rcu(&type->list);
8158         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8159 }
8160 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
8161
8162 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
8163         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
8164                                             .len = NFT_NAME_MAXLEN - 1 },
8165         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
8166                                             .len = NFT_NAME_MAXLEN - 1 },
8167         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
8168         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
8169         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
8170 };
8171
8172 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
8173                                            const struct nlattr *nla, u8 genmask)
8174 {
8175         struct nft_flowtable *flowtable;
8176
8177         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8178                 if (!nla_strcmp(nla, flowtable->name) &&
8179                     nft_active_genmask(flowtable, genmask))
8180                         return flowtable;
8181         }
8182         return ERR_PTR(-ENOENT);
8183 }
8184 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
8185
8186 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
8187                                     struct nft_flowtable *flowtable,
8188                                     enum nft_trans_phase phase)
8189 {
8190         switch (phase) {
8191         case NFT_TRANS_PREPARE_ERROR:
8192         case NFT_TRANS_PREPARE:
8193         case NFT_TRANS_ABORT:
8194         case NFT_TRANS_RELEASE:
8195                 nft_use_dec(&flowtable->use);
8196                 fallthrough;
8197         default:
8198                 return;
8199         }
8200 }
8201 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
8202
8203 static struct nft_flowtable *
8204 nft_flowtable_lookup_byhandle(const struct nft_table *table,
8205                               const struct nlattr *nla, u8 genmask)
8206 {
8207        struct nft_flowtable *flowtable;
8208
8209        list_for_each_entry(flowtable, &table->flowtables, list) {
8210                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
8211                    nft_active_genmask(flowtable, genmask))
8212                        return flowtable;
8213        }
8214        return ERR_PTR(-ENOENT);
8215 }
8216
8217 struct nft_flowtable_hook {
8218         u32                     num;
8219         int                     priority;
8220         struct list_head        list;
8221 };
8222
8223 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
8224         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
8225         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
8226         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
8227 };
8228
8229 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
8230                                     const struct nlattr * const nla[],
8231                                     struct nft_flowtable_hook *flowtable_hook,
8232                                     struct nft_flowtable *flowtable,
8233                                     struct netlink_ext_ack *extack, bool add)
8234 {
8235         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
8236         struct nft_hook *hook;
8237         int hooknum, priority;
8238         int err;
8239
8240         INIT_LIST_HEAD(&flowtable_hook->list);
8241
8242         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
8243                                           nla[NFTA_FLOWTABLE_HOOK],
8244                                           nft_flowtable_hook_policy, NULL);
8245         if (err < 0)
8246                 return err;
8247
8248         if (add) {
8249                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
8250                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8251                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8252                         return -ENOENT;
8253                 }
8254
8255                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8256                 if (hooknum != NF_NETDEV_INGRESS)
8257                         return -EOPNOTSUPP;
8258
8259                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8260
8261                 flowtable_hook->priority        = priority;
8262                 flowtable_hook->num             = hooknum;
8263         } else {
8264                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8265                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8266                         if (hooknum != flowtable->hooknum)
8267                                 return -EOPNOTSUPP;
8268                 }
8269
8270                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8271                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8272                         if (priority != flowtable->data.priority)
8273                                 return -EOPNOTSUPP;
8274                 }
8275
8276                 flowtable_hook->priority        = flowtable->data.priority;
8277                 flowtable_hook->num             = flowtable->hooknum;
8278         }
8279
8280         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8281                 err = nf_tables_parse_netdev_hooks(ctx->net,
8282                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
8283                                                    &flowtable_hook->list,
8284                                                    extack);
8285                 if (err < 0)
8286                         return err;
8287         }
8288
8289         list_for_each_entry(hook, &flowtable_hook->list, list) {
8290                 hook->ops.pf            = NFPROTO_NETDEV;
8291                 hook->ops.hooknum       = flowtable_hook->num;
8292                 hook->ops.priority      = flowtable_hook->priority;
8293                 hook->ops.priv          = &flowtable->data;
8294                 hook->ops.hook          = flowtable->data.type->hook;
8295         }
8296
8297         return err;
8298 }
8299
8300 /* call under rcu_read_lock */
8301 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8302 {
8303         const struct nf_flowtable_type *type;
8304
8305         list_for_each_entry_rcu(type, &nf_tables_flowtables, list) {
8306                 if (family == type->family)
8307                         return type;
8308         }
8309         return NULL;
8310 }
8311
8312 static const struct nf_flowtable_type *
8313 nft_flowtable_type_get(struct net *net, u8 family)
8314 {
8315         const struct nf_flowtable_type *type;
8316
8317         rcu_read_lock();
8318         type = __nft_flowtable_type_get(family);
8319         if (type != NULL && try_module_get(type->owner)) {
8320                 rcu_read_unlock();
8321                 return type;
8322         }
8323         rcu_read_unlock();
8324
8325         lockdep_nfnl_nft_mutex_not_held();
8326 #ifdef CONFIG_MODULES
8327         if (type == NULL) {
8328                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8329                         return ERR_PTR(-EAGAIN);
8330         }
8331 #endif
8332         return ERR_PTR(-ENOENT);
8333 }
8334
8335 /* Only called from error and netdev event paths. */
8336 static void nft_unregister_flowtable_hook(struct net *net,
8337                                           struct nft_flowtable *flowtable,
8338                                           struct nft_hook *hook)
8339 {
8340         nf_unregister_net_hook(net, &hook->ops);
8341         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8342                                     FLOW_BLOCK_UNBIND);
8343 }
8344
8345 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8346                                                  struct list_head *hook_list,
8347                                                  bool release_netdev)
8348 {
8349         struct nft_hook *hook, *next;
8350
8351         list_for_each_entry_safe(hook, next, hook_list, list) {
8352                 nf_unregister_net_hook(net, &hook->ops);
8353                 if (release_netdev) {
8354                         list_del(&hook->list);
8355                         kfree_rcu(hook, rcu);
8356                 }
8357         }
8358 }
8359
8360 static void nft_unregister_flowtable_net_hooks(struct net *net,
8361                                                struct list_head *hook_list)
8362 {
8363         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8364 }
8365
8366 static int nft_register_flowtable_net_hooks(struct net *net,
8367                                             struct nft_table *table,
8368                                             struct list_head *hook_list,
8369                                             struct nft_flowtable *flowtable)
8370 {
8371         struct nft_hook *hook, *hook2, *next;
8372         struct nft_flowtable *ft;
8373         int err, i = 0;
8374
8375         list_for_each_entry(hook, hook_list, list) {
8376                 list_for_each_entry(ft, &table->flowtables, list) {
8377                         if (!nft_is_active_next(net, ft))
8378                                 continue;
8379
8380                         list_for_each_entry(hook2, &ft->hook_list, list) {
8381                                 if (hook->ops.dev == hook2->ops.dev &&
8382                                     hook->ops.pf == hook2->ops.pf) {
8383                                         err = -EEXIST;
8384                                         goto err_unregister_net_hooks;
8385                                 }
8386                         }
8387                 }
8388
8389                 err = flowtable->data.type->setup(&flowtable->data,
8390                                                   hook->ops.dev,
8391                                                   FLOW_BLOCK_BIND);
8392                 if (err < 0)
8393                         goto err_unregister_net_hooks;
8394
8395                 err = nf_register_net_hook(net, &hook->ops);
8396                 if (err < 0) {
8397                         flowtable->data.type->setup(&flowtable->data,
8398                                                     hook->ops.dev,
8399                                                     FLOW_BLOCK_UNBIND);
8400                         goto err_unregister_net_hooks;
8401                 }
8402
8403                 i++;
8404         }
8405
8406         return 0;
8407
8408 err_unregister_net_hooks:
8409         list_for_each_entry_safe(hook, next, hook_list, list) {
8410                 if (i-- <= 0)
8411                         break;
8412
8413                 nft_unregister_flowtable_hook(net, flowtable, hook);
8414                 list_del_rcu(&hook->list);
8415                 kfree_rcu(hook, rcu);
8416         }
8417
8418         return err;
8419 }
8420
8421 static void nft_hooks_destroy(struct list_head *hook_list)
8422 {
8423         struct nft_hook *hook, *next;
8424
8425         list_for_each_entry_safe(hook, next, hook_list, list) {
8426                 list_del_rcu(&hook->list);
8427                 kfree_rcu(hook, rcu);
8428         }
8429 }
8430
8431 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8432                                 struct nft_flowtable *flowtable,
8433                                 struct netlink_ext_ack *extack)
8434 {
8435         const struct nlattr * const *nla = ctx->nla;
8436         struct nft_flowtable_hook flowtable_hook;
8437         struct nft_hook *hook, *next;
8438         struct nft_trans *trans;
8439         bool unregister = false;
8440         u32 flags;
8441         int err;
8442
8443         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8444                                        extack, false);
8445         if (err < 0)
8446                 return err;
8447
8448         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8449                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8450                         list_del(&hook->list);
8451                         kfree(hook);
8452                 }
8453         }
8454
8455         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8456                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8457                 if (flags & ~NFT_FLOWTABLE_MASK) {
8458                         err = -EOPNOTSUPP;
8459                         goto err_flowtable_update_hook;
8460                 }
8461                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8462                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8463                         err = -EOPNOTSUPP;
8464                         goto err_flowtable_update_hook;
8465                 }
8466         } else {
8467                 flags = flowtable->data.flags;
8468         }
8469
8470         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8471                                                &flowtable_hook.list, flowtable);
8472         if (err < 0)
8473                 goto err_flowtable_update_hook;
8474
8475         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8476                                 sizeof(struct nft_trans_flowtable));
8477         if (!trans) {
8478                 unregister = true;
8479                 err = -ENOMEM;
8480                 goto err_flowtable_update_hook;
8481         }
8482
8483         nft_trans_flowtable_flags(trans) = flags;
8484         nft_trans_flowtable(trans) = flowtable;
8485         nft_trans_flowtable_update(trans) = true;
8486         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8487         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8488
8489         nft_trans_commit_list_add_tail(ctx->net, trans);
8490
8491         return 0;
8492
8493 err_flowtable_update_hook:
8494         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8495                 if (unregister)
8496                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8497                 list_del_rcu(&hook->list);
8498                 kfree_rcu(hook, rcu);
8499         }
8500
8501         return err;
8502
8503 }
8504
8505 static int nf_tables_newflowtable(struct sk_buff *skb,
8506                                   const struct nfnl_info *info,
8507                                   const struct nlattr * const nla[])
8508 {
8509         struct netlink_ext_ack *extack = info->extack;
8510         struct nft_flowtable_hook flowtable_hook;
8511         u8 genmask = nft_genmask_next(info->net);
8512         u8 family = info->nfmsg->nfgen_family;
8513         const struct nf_flowtable_type *type;
8514         struct nft_flowtable *flowtable;
8515         struct net *net = info->net;
8516         struct nft_table *table;
8517         struct nft_trans *trans;
8518         struct nft_ctx ctx;
8519         int err;
8520
8521         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8522             !nla[NFTA_FLOWTABLE_NAME] ||
8523             !nla[NFTA_FLOWTABLE_HOOK])
8524                 return -EINVAL;
8525
8526         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8527                                  genmask, NETLINK_CB(skb).portid);
8528         if (IS_ERR(table)) {
8529                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8530                 return PTR_ERR(table);
8531         }
8532
8533         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8534                                          genmask);
8535         if (IS_ERR(flowtable)) {
8536                 err = PTR_ERR(flowtable);
8537                 if (err != -ENOENT) {
8538                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8539                         return err;
8540                 }
8541         } else {
8542                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8543                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8544                         return -EEXIST;
8545                 }
8546
8547                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8548
8549                 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8550         }
8551
8552         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8553
8554         if (!nft_use_inc(&table->use))
8555                 return -EMFILE;
8556
8557         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8558         if (!flowtable) {
8559                 err = -ENOMEM;
8560                 goto flowtable_alloc;
8561         }
8562
8563         flowtable->table = table;
8564         flowtable->handle = nf_tables_alloc_handle(table);
8565         INIT_LIST_HEAD(&flowtable->hook_list);
8566
8567         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8568         if (!flowtable->name) {
8569                 err = -ENOMEM;
8570                 goto err1;
8571         }
8572
8573         type = nft_flowtable_type_get(net, family);
8574         if (IS_ERR(type)) {
8575                 err = PTR_ERR(type);
8576                 goto err2;
8577         }
8578
8579         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8580                 flowtable->data.flags =
8581                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8582                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8583                         err = -EOPNOTSUPP;
8584                         goto err3;
8585                 }
8586         }
8587
8588         write_pnet(&flowtable->data.net, net);
8589         flowtable->data.type = type;
8590         err = type->init(&flowtable->data);
8591         if (err < 0)
8592                 goto err3;
8593
8594         err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8595                                        extack, true);
8596         if (err < 0)
8597                 goto err_flowtable_parse_hooks;
8598
8599         list_splice(&flowtable_hook.list, &flowtable->hook_list);
8600         flowtable->data.priority = flowtable_hook.priority;
8601         flowtable->hooknum = flowtable_hook.num;
8602
8603         trans = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8604         if (IS_ERR(trans)) {
8605                 err = PTR_ERR(trans);
8606                 goto err_flowtable_trans;
8607         }
8608
8609         /* This must be LAST to ensure no packets are walking over this flowtable. */
8610         err = nft_register_flowtable_net_hooks(ctx.net, table,
8611                                                &flowtable->hook_list,
8612                                                flowtable);
8613         if (err < 0)
8614                 goto err_flowtable_hooks;
8615
8616         list_add_tail_rcu(&flowtable->list, &table->flowtables);
8617
8618         return 0;
8619
8620 err_flowtable_hooks:
8621         nft_trans_destroy(trans);
8622 err_flowtable_trans:
8623         nft_hooks_destroy(&flowtable->hook_list);
8624 err_flowtable_parse_hooks:
8625         flowtable->data.type->free(&flowtable->data);
8626 err3:
8627         module_put(type->owner);
8628 err2:
8629         kfree(flowtable->name);
8630 err1:
8631         kfree(flowtable);
8632 flowtable_alloc:
8633         nft_use_dec_restore(&table->use);
8634
8635         return err;
8636 }
8637
8638 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8639 {
8640         struct nft_hook *this, *next;
8641
8642         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8643                 list_del(&this->list);
8644                 kfree(this);
8645         }
8646 }
8647
8648 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8649                                  struct nft_flowtable *flowtable,
8650                                  struct netlink_ext_ack *extack)
8651 {
8652         const struct nlattr * const *nla = ctx->nla;
8653         struct nft_flowtable_hook flowtable_hook;
8654         LIST_HEAD(flowtable_del_list);
8655         struct nft_hook *this, *hook;
8656         struct nft_trans *trans;
8657         int err;
8658
8659         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8660                                        extack, false);
8661         if (err < 0)
8662                 return err;
8663
8664         list_for_each_entry(this, &flowtable_hook.list, list) {
8665                 hook = nft_hook_list_find(&flowtable->hook_list, this);
8666                 if (!hook) {
8667                         err = -ENOENT;
8668                         goto err_flowtable_del_hook;
8669                 }
8670                 list_move(&hook->list, &flowtable_del_list);
8671         }
8672
8673         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8674                                 sizeof(struct nft_trans_flowtable));
8675         if (!trans) {
8676                 err = -ENOMEM;
8677                 goto err_flowtable_del_hook;
8678         }
8679
8680         nft_trans_flowtable(trans) = flowtable;
8681         nft_trans_flowtable_update(trans) = true;
8682         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8683         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8684         nft_flowtable_hook_release(&flowtable_hook);
8685
8686         nft_trans_commit_list_add_tail(ctx->net, trans);
8687
8688         return 0;
8689
8690 err_flowtable_del_hook:
8691         list_splice(&flowtable_del_list, &flowtable->hook_list);
8692         nft_flowtable_hook_release(&flowtable_hook);
8693
8694         return err;
8695 }
8696
8697 static int nf_tables_delflowtable(struct sk_buff *skb,
8698                                   const struct nfnl_info *info,
8699                                   const struct nlattr * const nla[])
8700 {
8701         struct netlink_ext_ack *extack = info->extack;
8702         u8 genmask = nft_genmask_next(info->net);
8703         u8 family = info->nfmsg->nfgen_family;
8704         struct nft_flowtable *flowtable;
8705         struct net *net = info->net;
8706         const struct nlattr *attr;
8707         struct nft_table *table;
8708         struct nft_ctx ctx;
8709
8710         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8711             (!nla[NFTA_FLOWTABLE_NAME] &&
8712              !nla[NFTA_FLOWTABLE_HANDLE]))
8713                 return -EINVAL;
8714
8715         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8716                                  genmask, NETLINK_CB(skb).portid);
8717         if (IS_ERR(table)) {
8718                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8719                 return PTR_ERR(table);
8720         }
8721
8722         if (nla[NFTA_FLOWTABLE_HANDLE]) {
8723                 attr = nla[NFTA_FLOWTABLE_HANDLE];
8724                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8725         } else {
8726                 attr = nla[NFTA_FLOWTABLE_NAME];
8727                 flowtable = nft_flowtable_lookup(table, attr, genmask);
8728         }
8729
8730         if (IS_ERR(flowtable)) {
8731                 if (PTR_ERR(flowtable) == -ENOENT &&
8732                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8733                         return 0;
8734
8735                 NL_SET_BAD_ATTR(extack, attr);
8736                 return PTR_ERR(flowtable);
8737         }
8738
8739         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8740
8741         if (nla[NFTA_FLOWTABLE_HOOK])
8742                 return nft_delflowtable_hook(&ctx, flowtable, extack);
8743
8744         if (flowtable->use > 0) {
8745                 NL_SET_BAD_ATTR(extack, attr);
8746                 return -EBUSY;
8747         }
8748
8749         return nft_delflowtable(&ctx, flowtable);
8750 }
8751
8752 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8753                                          u32 portid, u32 seq, int event,
8754                                          u32 flags, int family,
8755                                          struct nft_flowtable *flowtable,
8756                                          struct list_head *hook_list)
8757 {
8758         struct nlattr *nest, *nest_devs;
8759         struct nft_hook *hook;
8760         struct nlmsghdr *nlh;
8761
8762         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8763         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8764                            NFNETLINK_V0, nft_base_seq(net));
8765         if (!nlh)
8766                 goto nla_put_failure;
8767
8768         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8769             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8770             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8771                          NFTA_FLOWTABLE_PAD))
8772                 goto nla_put_failure;
8773
8774         if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8775                 nlmsg_end(skb, nlh);
8776                 return 0;
8777         }
8778
8779         if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8780             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8781                 goto nla_put_failure;
8782
8783         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8784         if (!nest)
8785                 goto nla_put_failure;
8786         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8787             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8788                 goto nla_put_failure;
8789
8790         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8791         if (!nest_devs)
8792                 goto nla_put_failure;
8793
8794         if (!hook_list)
8795                 hook_list = &flowtable->hook_list;
8796
8797         list_for_each_entry_rcu(hook, hook_list, list) {
8798                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8799                         goto nla_put_failure;
8800         }
8801         nla_nest_end(skb, nest_devs);
8802         nla_nest_end(skb, nest);
8803
8804         nlmsg_end(skb, nlh);
8805         return 0;
8806
8807 nla_put_failure:
8808         nlmsg_trim(skb, nlh);
8809         return -1;
8810 }
8811
8812 struct nft_flowtable_filter {
8813         char            *table;
8814 };
8815
8816 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8817                                     struct netlink_callback *cb)
8818 {
8819         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8820         struct nft_flowtable_filter *filter = cb->data;
8821         unsigned int idx = 0, s_idx = cb->args[0];
8822         struct net *net = sock_net(skb->sk);
8823         int family = nfmsg->nfgen_family;
8824         struct nft_flowtable *flowtable;
8825         struct nftables_pernet *nft_net;
8826         const struct nft_table *table;
8827
8828         rcu_read_lock();
8829         nft_net = nft_pernet(net);
8830         cb->seq = READ_ONCE(nft_net->base_seq);
8831
8832         list_for_each_entry_rcu(table, &nft_net->tables, list) {
8833                 if (family != NFPROTO_UNSPEC && family != table->family)
8834                         continue;
8835
8836                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8837                         if (!nft_is_active(net, flowtable))
8838                                 goto cont;
8839                         if (idx < s_idx)
8840                                 goto cont;
8841                         if (idx > s_idx)
8842                                 memset(&cb->args[1], 0,
8843                                        sizeof(cb->args) - sizeof(cb->args[0]));
8844                         if (filter && filter->table &&
8845                             strcmp(filter->table, table->name))
8846                                 goto cont;
8847
8848                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8849                                                           cb->nlh->nlmsg_seq,
8850                                                           NFT_MSG_NEWFLOWTABLE,
8851                                                           NLM_F_MULTI | NLM_F_APPEND,
8852                                                           table->family,
8853                                                           flowtable, NULL) < 0)
8854                                 goto done;
8855
8856                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8857 cont:
8858                         idx++;
8859                 }
8860         }
8861 done:
8862         rcu_read_unlock();
8863
8864         cb->args[0] = idx;
8865         return skb->len;
8866 }
8867
8868 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8869 {
8870         const struct nlattr * const *nla = cb->data;
8871         struct nft_flowtable_filter *filter = NULL;
8872
8873         if (nla[NFTA_FLOWTABLE_TABLE]) {
8874                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8875                 if (!filter)
8876                         return -ENOMEM;
8877
8878                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8879                                            GFP_ATOMIC);
8880                 if (!filter->table) {
8881                         kfree(filter);
8882                         return -ENOMEM;
8883                 }
8884         }
8885
8886         cb->data = filter;
8887         return 0;
8888 }
8889
8890 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8891 {
8892         struct nft_flowtable_filter *filter = cb->data;
8893
8894         if (!filter)
8895                 return 0;
8896
8897         kfree(filter->table);
8898         kfree(filter);
8899
8900         return 0;
8901 }
8902
8903 /* called with rcu_read_lock held */
8904 static int nf_tables_getflowtable(struct sk_buff *skb,
8905                                   const struct nfnl_info *info,
8906                                   const struct nlattr * const nla[])
8907 {
8908         struct netlink_ext_ack *extack = info->extack;
8909         u8 genmask = nft_genmask_cur(info->net);
8910         u8 family = info->nfmsg->nfgen_family;
8911         struct nft_flowtable *flowtable;
8912         const struct nft_table *table;
8913         struct net *net = info->net;
8914         struct sk_buff *skb2;
8915         int err;
8916
8917         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8918                 struct netlink_dump_control c = {
8919                         .start = nf_tables_dump_flowtable_start,
8920                         .dump = nf_tables_dump_flowtable,
8921                         .done = nf_tables_dump_flowtable_done,
8922                         .module = THIS_MODULE,
8923                         .data = (void *)nla,
8924                 };
8925
8926                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8927         }
8928
8929         if (!nla[NFTA_FLOWTABLE_NAME])
8930                 return -EINVAL;
8931
8932         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8933                                  genmask, 0);
8934         if (IS_ERR(table)) {
8935                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8936                 return PTR_ERR(table);
8937         }
8938
8939         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8940                                          genmask);
8941         if (IS_ERR(flowtable)) {
8942                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8943                 return PTR_ERR(flowtable);
8944         }
8945
8946         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8947         if (!skb2)
8948                 return -ENOMEM;
8949
8950         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8951                                             info->nlh->nlmsg_seq,
8952                                             NFT_MSG_NEWFLOWTABLE, 0, family,
8953                                             flowtable, NULL);
8954         if (err < 0)
8955                 goto err_fill_flowtable_info;
8956
8957         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8958
8959 err_fill_flowtable_info:
8960         kfree_skb(skb2);
8961         return err;
8962 }
8963
8964 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8965                                        struct nft_flowtable *flowtable,
8966                                        struct list_head *hook_list, int event)
8967 {
8968         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8969         struct sk_buff *skb;
8970         u16 flags = 0;
8971         int err;
8972
8973         if (!ctx->report &&
8974             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8975                 return;
8976
8977         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8978         if (skb == NULL)
8979                 goto err;
8980
8981         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8982                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8983
8984         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8985                                             ctx->seq, event, flags,
8986                                             ctx->family, flowtable, hook_list);
8987         if (err < 0) {
8988                 kfree_skb(skb);
8989                 goto err;
8990         }
8991
8992         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8993         return;
8994 err:
8995         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8996 }
8997
8998 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8999 {
9000         struct nft_hook *hook, *next;
9001
9002         flowtable->data.type->free(&flowtable->data);
9003         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
9004                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
9005                                             FLOW_BLOCK_UNBIND);
9006                 list_del_rcu(&hook->list);
9007                 kfree(hook);
9008         }
9009         kfree(flowtable->name);
9010         module_put(flowtable->data.type->owner);
9011         kfree(flowtable);
9012 }
9013
9014 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
9015                                    u32 portid, u32 seq)
9016 {
9017         struct nftables_pernet *nft_net = nft_pernet(net);
9018         struct nlmsghdr *nlh;
9019         char buf[TASK_COMM_LEN];
9020         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
9021
9022         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
9023                            NFNETLINK_V0, nft_base_seq(net));
9024         if (!nlh)
9025                 goto nla_put_failure;
9026
9027         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
9028             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
9029             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
9030                 goto nla_put_failure;
9031
9032         nlmsg_end(skb, nlh);
9033         return 0;
9034
9035 nla_put_failure:
9036         nlmsg_trim(skb, nlh);
9037         return -EMSGSIZE;
9038 }
9039
9040 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
9041                                 struct nft_flowtable *flowtable)
9042 {
9043         struct nft_hook *hook;
9044
9045         list_for_each_entry(hook, &flowtable->hook_list, list) {
9046                 if (hook->ops.dev != dev)
9047                         continue;
9048
9049                 /* flow_offload_netdev_event() cleans up entries for us. */
9050                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
9051                 list_del_rcu(&hook->list);
9052                 kfree_rcu(hook, rcu);
9053                 break;
9054         }
9055 }
9056
9057 static int nf_tables_flowtable_event(struct notifier_block *this,
9058                                      unsigned long event, void *ptr)
9059 {
9060         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
9061         struct nft_flowtable *flowtable;
9062         struct nftables_pernet *nft_net;
9063         struct nft_table *table;
9064         struct net *net;
9065
9066         if (event != NETDEV_UNREGISTER)
9067                 return 0;
9068
9069         net = dev_net(dev);
9070         nft_net = nft_pernet(net);
9071         mutex_lock(&nft_net->commit_mutex);
9072         list_for_each_entry(table, &nft_net->tables, list) {
9073                 list_for_each_entry(flowtable, &table->flowtables, list) {
9074                         nft_flowtable_event(event, dev, flowtable);
9075                 }
9076         }
9077         mutex_unlock(&nft_net->commit_mutex);
9078
9079         return NOTIFY_DONE;
9080 }
9081
9082 static struct notifier_block nf_tables_flowtable_notifier = {
9083         .notifier_call  = nf_tables_flowtable_event,
9084 };
9085
9086 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
9087                                  int event)
9088 {
9089         struct nlmsghdr *nlh = nlmsg_hdr(skb);
9090         struct sk_buff *skb2;
9091         int err;
9092
9093         if (!nlmsg_report(nlh) &&
9094             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
9095                 return;
9096
9097         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
9098         if (skb2 == NULL)
9099                 goto err;
9100
9101         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
9102                                       nlh->nlmsg_seq);
9103         if (err < 0) {
9104                 kfree_skb(skb2);
9105                 goto err;
9106         }
9107
9108         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
9109                        nlmsg_report(nlh), GFP_KERNEL);
9110         return;
9111 err:
9112         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
9113                           -ENOBUFS);
9114 }
9115
9116 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
9117                             const struct nlattr * const nla[])
9118 {
9119         struct sk_buff *skb2;
9120         int err;
9121
9122         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
9123         if (skb2 == NULL)
9124                 return -ENOMEM;
9125
9126         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
9127                                       info->nlh->nlmsg_seq);
9128         if (err < 0)
9129                 goto err_fill_gen_info;
9130
9131         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
9132
9133 err_fill_gen_info:
9134         kfree_skb(skb2);
9135         return err;
9136 }
9137
9138 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
9139         [NFT_MSG_NEWTABLE] = {
9140                 .call           = nf_tables_newtable,
9141                 .type           = NFNL_CB_BATCH,
9142                 .attr_count     = NFTA_TABLE_MAX,
9143                 .policy         = nft_table_policy,
9144         },
9145         [NFT_MSG_GETTABLE] = {
9146                 .call           = nf_tables_gettable,
9147                 .type           = NFNL_CB_RCU,
9148                 .attr_count     = NFTA_TABLE_MAX,
9149                 .policy         = nft_table_policy,
9150         },
9151         [NFT_MSG_DELTABLE] = {
9152                 .call           = nf_tables_deltable,
9153                 .type           = NFNL_CB_BATCH,
9154                 .attr_count     = NFTA_TABLE_MAX,
9155                 .policy         = nft_table_policy,
9156         },
9157         [NFT_MSG_DESTROYTABLE] = {
9158                 .call           = nf_tables_deltable,
9159                 .type           = NFNL_CB_BATCH,
9160                 .attr_count     = NFTA_TABLE_MAX,
9161                 .policy         = nft_table_policy,
9162         },
9163         [NFT_MSG_NEWCHAIN] = {
9164                 .call           = nf_tables_newchain,
9165                 .type           = NFNL_CB_BATCH,
9166                 .attr_count     = NFTA_CHAIN_MAX,
9167                 .policy         = nft_chain_policy,
9168         },
9169         [NFT_MSG_GETCHAIN] = {
9170                 .call           = nf_tables_getchain,
9171                 .type           = NFNL_CB_RCU,
9172                 .attr_count     = NFTA_CHAIN_MAX,
9173                 .policy         = nft_chain_policy,
9174         },
9175         [NFT_MSG_DELCHAIN] = {
9176                 .call           = nf_tables_delchain,
9177                 .type           = NFNL_CB_BATCH,
9178                 .attr_count     = NFTA_CHAIN_MAX,
9179                 .policy         = nft_chain_policy,
9180         },
9181         [NFT_MSG_DESTROYCHAIN] = {
9182                 .call           = nf_tables_delchain,
9183                 .type           = NFNL_CB_BATCH,
9184                 .attr_count     = NFTA_CHAIN_MAX,
9185                 .policy         = nft_chain_policy,
9186         },
9187         [NFT_MSG_NEWRULE] = {
9188                 .call           = nf_tables_newrule,
9189                 .type           = NFNL_CB_BATCH,
9190                 .attr_count     = NFTA_RULE_MAX,
9191                 .policy         = nft_rule_policy,
9192         },
9193         [NFT_MSG_GETRULE] = {
9194                 .call           = nf_tables_getrule,
9195                 .type           = NFNL_CB_RCU,
9196                 .attr_count     = NFTA_RULE_MAX,
9197                 .policy         = nft_rule_policy,
9198         },
9199         [NFT_MSG_GETRULE_RESET] = {
9200                 .call           = nf_tables_getrule_reset,
9201                 .type           = NFNL_CB_RCU,
9202                 .attr_count     = NFTA_RULE_MAX,
9203                 .policy         = nft_rule_policy,
9204         },
9205         [NFT_MSG_DELRULE] = {
9206                 .call           = nf_tables_delrule,
9207                 .type           = NFNL_CB_BATCH,
9208                 .attr_count     = NFTA_RULE_MAX,
9209                 .policy         = nft_rule_policy,
9210         },
9211         [NFT_MSG_DESTROYRULE] = {
9212                 .call           = nf_tables_delrule,
9213                 .type           = NFNL_CB_BATCH,
9214                 .attr_count     = NFTA_RULE_MAX,
9215                 .policy         = nft_rule_policy,
9216         },
9217         [NFT_MSG_NEWSET] = {
9218                 .call           = nf_tables_newset,
9219                 .type           = NFNL_CB_BATCH,
9220                 .attr_count     = NFTA_SET_MAX,
9221                 .policy         = nft_set_policy,
9222         },
9223         [NFT_MSG_GETSET] = {
9224                 .call           = nf_tables_getset,
9225                 .type           = NFNL_CB_RCU,
9226                 .attr_count     = NFTA_SET_MAX,
9227                 .policy         = nft_set_policy,
9228         },
9229         [NFT_MSG_DELSET] = {
9230                 .call           = nf_tables_delset,
9231                 .type           = NFNL_CB_BATCH,
9232                 .attr_count     = NFTA_SET_MAX,
9233                 .policy         = nft_set_policy,
9234         },
9235         [NFT_MSG_DESTROYSET] = {
9236                 .call           = nf_tables_delset,
9237                 .type           = NFNL_CB_BATCH,
9238                 .attr_count     = NFTA_SET_MAX,
9239                 .policy         = nft_set_policy,
9240         },
9241         [NFT_MSG_NEWSETELEM] = {
9242                 .call           = nf_tables_newsetelem,
9243                 .type           = NFNL_CB_BATCH,
9244                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9245                 .policy         = nft_set_elem_list_policy,
9246         },
9247         [NFT_MSG_GETSETELEM] = {
9248                 .call           = nf_tables_getsetelem,
9249                 .type           = NFNL_CB_RCU,
9250                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9251                 .policy         = nft_set_elem_list_policy,
9252         },
9253         [NFT_MSG_GETSETELEM_RESET] = {
9254                 .call           = nf_tables_getsetelem_reset,
9255                 .type           = NFNL_CB_RCU,
9256                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9257                 .policy         = nft_set_elem_list_policy,
9258         },
9259         [NFT_MSG_DELSETELEM] = {
9260                 .call           = nf_tables_delsetelem,
9261                 .type           = NFNL_CB_BATCH,
9262                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9263                 .policy         = nft_set_elem_list_policy,
9264         },
9265         [NFT_MSG_DESTROYSETELEM] = {
9266                 .call           = nf_tables_delsetelem,
9267                 .type           = NFNL_CB_BATCH,
9268                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9269                 .policy         = nft_set_elem_list_policy,
9270         },
9271         [NFT_MSG_GETGEN] = {
9272                 .call           = nf_tables_getgen,
9273                 .type           = NFNL_CB_RCU,
9274         },
9275         [NFT_MSG_NEWOBJ] = {
9276                 .call           = nf_tables_newobj,
9277                 .type           = NFNL_CB_BATCH,
9278                 .attr_count     = NFTA_OBJ_MAX,
9279                 .policy         = nft_obj_policy,
9280         },
9281         [NFT_MSG_GETOBJ] = {
9282                 .call           = nf_tables_getobj,
9283                 .type           = NFNL_CB_RCU,
9284                 .attr_count     = NFTA_OBJ_MAX,
9285                 .policy         = nft_obj_policy,
9286         },
9287         [NFT_MSG_DELOBJ] = {
9288                 .call           = nf_tables_delobj,
9289                 .type           = NFNL_CB_BATCH,
9290                 .attr_count     = NFTA_OBJ_MAX,
9291                 .policy         = nft_obj_policy,
9292         },
9293         [NFT_MSG_DESTROYOBJ] = {
9294                 .call           = nf_tables_delobj,
9295                 .type           = NFNL_CB_BATCH,
9296                 .attr_count     = NFTA_OBJ_MAX,
9297                 .policy         = nft_obj_policy,
9298         },
9299         [NFT_MSG_GETOBJ_RESET] = {
9300                 .call           = nf_tables_getobj,
9301                 .type           = NFNL_CB_RCU,
9302                 .attr_count     = NFTA_OBJ_MAX,
9303                 .policy         = nft_obj_policy,
9304         },
9305         [NFT_MSG_NEWFLOWTABLE] = {
9306                 .call           = nf_tables_newflowtable,
9307                 .type           = NFNL_CB_BATCH,
9308                 .attr_count     = NFTA_FLOWTABLE_MAX,
9309                 .policy         = nft_flowtable_policy,
9310         },
9311         [NFT_MSG_GETFLOWTABLE] = {
9312                 .call           = nf_tables_getflowtable,
9313                 .type           = NFNL_CB_RCU,
9314                 .attr_count     = NFTA_FLOWTABLE_MAX,
9315                 .policy         = nft_flowtable_policy,
9316         },
9317         [NFT_MSG_DELFLOWTABLE] = {
9318                 .call           = nf_tables_delflowtable,
9319                 .type           = NFNL_CB_BATCH,
9320                 .attr_count     = NFTA_FLOWTABLE_MAX,
9321                 .policy         = nft_flowtable_policy,
9322         },
9323         [NFT_MSG_DESTROYFLOWTABLE] = {
9324                 .call           = nf_tables_delflowtable,
9325                 .type           = NFNL_CB_BATCH,
9326                 .attr_count     = NFTA_FLOWTABLE_MAX,
9327                 .policy         = nft_flowtable_policy,
9328         },
9329 };
9330
9331 static int nf_tables_validate(struct net *net)
9332 {
9333         struct nftables_pernet *nft_net = nft_pernet(net);
9334         struct nft_table *table;
9335
9336         list_for_each_entry(table, &nft_net->tables, list) {
9337                 switch (table->validate_state) {
9338                 case NFT_VALIDATE_SKIP:
9339                         continue;
9340                 case NFT_VALIDATE_NEED:
9341                         nft_validate_state_update(table, NFT_VALIDATE_DO);
9342                         fallthrough;
9343                 case NFT_VALIDATE_DO:
9344                         if (nft_table_validate(net, table) < 0)
9345                                 return -EAGAIN;
9346
9347                         nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9348                         break;
9349                 }
9350         }
9351
9352         return 0;
9353 }
9354
9355 /* a drop policy has to be deferred until all rules have been activated,
9356  * otherwise a large ruleset that contains a drop-policy base chain will
9357  * cause all packets to get dropped until the full transaction has been
9358  * processed.
9359  *
9360  * We defer the drop policy until the transaction has been finalized.
9361  */
9362 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9363 {
9364         struct nft_base_chain *basechain;
9365
9366         if (nft_trans_chain_policy(trans) != NF_DROP)
9367                 return;
9368
9369         if (!nft_is_base_chain(trans->ctx.chain))
9370                 return;
9371
9372         basechain = nft_base_chain(trans->ctx.chain);
9373         basechain->policy = NF_DROP;
9374 }
9375
9376 static void nft_chain_commit_update(struct nft_trans *trans)
9377 {
9378         struct nft_base_chain *basechain;
9379
9380         if (nft_trans_chain_name(trans)) {
9381                 rhltable_remove(&trans->ctx.table->chains_ht,
9382                                 &trans->ctx.chain->rhlhead,
9383                                 nft_chain_ht_params);
9384                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9385                 rhltable_insert_key(&trans->ctx.table->chains_ht,
9386                                     trans->ctx.chain->name,
9387                                     &trans->ctx.chain->rhlhead,
9388                                     nft_chain_ht_params);
9389         }
9390
9391         if (!nft_is_base_chain(trans->ctx.chain))
9392                 return;
9393
9394         nft_chain_stats_replace(trans);
9395
9396         basechain = nft_base_chain(trans->ctx.chain);
9397
9398         switch (nft_trans_chain_policy(trans)) {
9399         case NF_DROP:
9400         case NF_ACCEPT:
9401                 basechain->policy = nft_trans_chain_policy(trans);
9402                 break;
9403         }
9404 }
9405
9406 static void nft_obj_commit_update(struct nft_trans *trans)
9407 {
9408         struct nft_object *newobj;
9409         struct nft_object *obj;
9410
9411         obj = nft_trans_obj(trans);
9412         newobj = nft_trans_obj_newobj(trans);
9413
9414         if (obj->ops->update)
9415                 obj->ops->update(obj, newobj);
9416
9417         nft_obj_destroy(&trans->ctx, newobj);
9418 }
9419
9420 static void nft_commit_release(struct nft_trans *trans)
9421 {
9422         switch (trans->msg_type) {
9423         case NFT_MSG_DELTABLE:
9424         case NFT_MSG_DESTROYTABLE:
9425                 nf_tables_table_destroy(&trans->ctx);
9426                 break;
9427         case NFT_MSG_NEWCHAIN:
9428                 free_percpu(nft_trans_chain_stats(trans));
9429                 kfree(nft_trans_chain_name(trans));
9430                 break;
9431         case NFT_MSG_DELCHAIN:
9432         case NFT_MSG_DESTROYCHAIN:
9433                 if (nft_trans_chain_update(trans))
9434                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9435                 else
9436                         nf_tables_chain_destroy(&trans->ctx);
9437                 break;
9438         case NFT_MSG_DELRULE:
9439         case NFT_MSG_DESTROYRULE:
9440                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9441                 break;
9442         case NFT_MSG_DELSET:
9443         case NFT_MSG_DESTROYSET:
9444                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9445                 break;
9446         case NFT_MSG_DELSETELEM:
9447         case NFT_MSG_DESTROYSETELEM:
9448                 nf_tables_set_elem_destroy(&trans->ctx,
9449                                            nft_trans_elem_set(trans),
9450                                            nft_trans_elem_priv(trans));
9451                 break;
9452         case NFT_MSG_DELOBJ:
9453         case NFT_MSG_DESTROYOBJ:
9454                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9455                 break;
9456         case NFT_MSG_DELFLOWTABLE:
9457         case NFT_MSG_DESTROYFLOWTABLE:
9458                 if (nft_trans_flowtable_update(trans))
9459                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9460                 else
9461                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9462                 break;
9463         }
9464
9465         if (trans->put_net)
9466                 put_net(trans->ctx.net);
9467
9468         kfree(trans);
9469 }
9470
9471 static void nf_tables_trans_destroy_work(struct work_struct *w)
9472 {
9473         struct nft_trans *trans, *next;
9474         LIST_HEAD(head);
9475
9476         spin_lock(&nf_tables_destroy_list_lock);
9477         list_splice_init(&nf_tables_destroy_list, &head);
9478         spin_unlock(&nf_tables_destroy_list_lock);
9479
9480         if (list_empty(&head))
9481                 return;
9482
9483         synchronize_rcu();
9484
9485         list_for_each_entry_safe(trans, next, &head, list) {
9486                 nft_trans_list_del(trans);
9487                 nft_commit_release(trans);
9488         }
9489 }
9490
9491 void nf_tables_trans_destroy_flush_work(void)
9492 {
9493         flush_work(&trans_destroy_work);
9494 }
9495 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9496
9497 static bool nft_expr_reduce(struct nft_regs_track *track,
9498                             const struct nft_expr *expr)
9499 {
9500         return false;
9501 }
9502
9503 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9504 {
9505         const struct nft_expr *expr, *last;
9506         struct nft_regs_track track = {};
9507         unsigned int size, data_size;
9508         void *data, *data_boundary;
9509         struct nft_rule_dp *prule;
9510         struct nft_rule *rule;
9511
9512         /* already handled or inactive chain? */
9513         if (chain->blob_next || !nft_is_active_next(net, chain))
9514                 return 0;
9515
9516         data_size = 0;
9517         list_for_each_entry(rule, &chain->rules, list) {
9518                 if (nft_is_active_next(net, rule)) {
9519                         data_size += sizeof(*prule) + rule->dlen;
9520                         if (data_size > INT_MAX)
9521                                 return -ENOMEM;
9522                 }
9523         }
9524
9525         chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9526         if (!chain->blob_next)
9527                 return -ENOMEM;
9528
9529         data = (void *)chain->blob_next->data;
9530         data_boundary = data + data_size;
9531         size = 0;
9532
9533         list_for_each_entry(rule, &chain->rules, list) {
9534                 if (!nft_is_active_next(net, rule))
9535                         continue;
9536
9537                 prule = (struct nft_rule_dp *)data;
9538                 data += offsetof(struct nft_rule_dp, data);
9539                 if (WARN_ON_ONCE(data > data_boundary))
9540                         return -ENOMEM;
9541
9542                 size = 0;
9543                 track.last = nft_expr_last(rule);
9544                 nft_rule_for_each_expr(expr, last, rule) {
9545                         track.cur = expr;
9546
9547                         if (nft_expr_reduce(&track, expr)) {
9548                                 expr = track.cur;
9549                                 continue;
9550                         }
9551
9552                         if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9553                                 return -ENOMEM;
9554
9555                         memcpy(data + size, expr, expr->ops->size);
9556                         size += expr->ops->size;
9557                 }
9558                 if (WARN_ON_ONCE(size >= 1 << 12))
9559                         return -ENOMEM;
9560
9561                 prule->handle = rule->handle;
9562                 prule->dlen = size;
9563                 prule->is_last = 0;
9564
9565                 data += size;
9566                 size = 0;
9567                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9568         }
9569
9570         if (WARN_ON_ONCE(data > data_boundary))
9571                 return -ENOMEM;
9572
9573         prule = (struct nft_rule_dp *)data;
9574         nft_last_rule(chain, prule);
9575
9576         return 0;
9577 }
9578
9579 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9580 {
9581         struct nftables_pernet *nft_net = nft_pernet(net);
9582         struct nft_trans *trans, *next;
9583
9584         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9585                 struct nft_chain *chain = trans->ctx.chain;
9586
9587                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9588                     trans->msg_type == NFT_MSG_DELRULE) {
9589                         kvfree(chain->blob_next);
9590                         chain->blob_next = NULL;
9591                 }
9592         }
9593 }
9594
9595 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9596 {
9597         struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9598
9599         kvfree(l->blob);
9600 }
9601
9602 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9603 {
9604         struct nft_rule_dp_last *last;
9605
9606         /* last rule trailer is after end marker */
9607         last = (void *)blob + sizeof(*blob) + blob->size;
9608         last->blob = blob;
9609
9610         call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9611 }
9612
9613 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9614 {
9615         struct nft_rule_blob *g0, *g1;
9616         bool next_genbit;
9617
9618         next_genbit = nft_gencursor_next(net);
9619
9620         g0 = rcu_dereference_protected(chain->blob_gen_0,
9621                                        lockdep_commit_lock_is_held(net));
9622         g1 = rcu_dereference_protected(chain->blob_gen_1,
9623                                        lockdep_commit_lock_is_held(net));
9624
9625         /* No changes to this chain? */
9626         if (chain->blob_next == NULL) {
9627                 /* chain had no change in last or next generation */
9628                 if (g0 == g1)
9629                         return;
9630                 /*
9631                  * chain had no change in this generation; make sure next
9632                  * one uses same rules as current generation.
9633                  */
9634                 if (next_genbit) {
9635                         rcu_assign_pointer(chain->blob_gen_1, g0);
9636                         nf_tables_commit_chain_free_rules_old(g1);
9637                 } else {
9638                         rcu_assign_pointer(chain->blob_gen_0, g1);
9639                         nf_tables_commit_chain_free_rules_old(g0);
9640                 }
9641
9642                 return;
9643         }
9644
9645         if (next_genbit)
9646                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9647         else
9648                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9649
9650         chain->blob_next = NULL;
9651
9652         if (g0 == g1)
9653                 return;
9654
9655         if (next_genbit)
9656                 nf_tables_commit_chain_free_rules_old(g1);
9657         else
9658                 nf_tables_commit_chain_free_rules_old(g0);
9659 }
9660
9661 static void nft_obj_del(struct nft_object *obj)
9662 {
9663         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9664         list_del_rcu(&obj->list);
9665 }
9666
9667 void nft_chain_del(struct nft_chain *chain)
9668 {
9669         struct nft_table *table = chain->table;
9670
9671         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9672                                      nft_chain_ht_params));
9673         list_del_rcu(&chain->list);
9674 }
9675
9676 static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
9677                                         struct nft_trans_gc *trans)
9678 {
9679         struct nft_elem_priv **priv = trans->priv;
9680         unsigned int i;
9681
9682         for (i = 0; i < trans->count; i++) {
9683                 nft_setelem_data_deactivate(ctx->net, trans->set, priv[i]);
9684                 nft_setelem_remove(ctx->net, trans->set, priv[i]);
9685         }
9686 }
9687
9688 void nft_trans_gc_destroy(struct nft_trans_gc *trans)
9689 {
9690         nft_set_put(trans->set);
9691         put_net(trans->net);
9692         kfree(trans);
9693 }
9694
9695 static void nft_trans_gc_trans_free(struct rcu_head *rcu)
9696 {
9697         struct nft_elem_priv *elem_priv;
9698         struct nft_trans_gc *trans;
9699         struct nft_ctx ctx = {};
9700         unsigned int i;
9701
9702         trans = container_of(rcu, struct nft_trans_gc, rcu);
9703         ctx.net = read_pnet(&trans->set->net);
9704
9705         for (i = 0; i < trans->count; i++) {
9706                 elem_priv = trans->priv[i];
9707                 if (!nft_setelem_is_catchall(trans->set, elem_priv))
9708                         atomic_dec(&trans->set->nelems);
9709
9710                 nf_tables_set_elem_destroy(&ctx, trans->set, elem_priv);
9711         }
9712
9713         nft_trans_gc_destroy(trans);
9714 }
9715
9716 static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
9717 {
9718         struct nftables_pernet *nft_net;
9719         struct nft_ctx ctx = {};
9720
9721         nft_net = nft_pernet(trans->net);
9722
9723         mutex_lock(&nft_net->commit_mutex);
9724
9725         /* Check for race with transaction, otherwise this batch refers to
9726          * stale objects that might not be there anymore. Skip transaction if
9727          * set has been destroyed from control plane transaction in case gc
9728          * worker loses race.
9729          */
9730         if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
9731                 mutex_unlock(&nft_net->commit_mutex);
9732                 return false;
9733         }
9734
9735         ctx.net = trans->net;
9736         ctx.table = trans->set->table;
9737
9738         nft_trans_gc_setelem_remove(&ctx, trans);
9739         mutex_unlock(&nft_net->commit_mutex);
9740
9741         return true;
9742 }
9743
9744 static void nft_trans_gc_work(struct work_struct *work)
9745 {
9746         struct nft_trans_gc *trans, *next;
9747         LIST_HEAD(trans_gc_list);
9748
9749         spin_lock(&nf_tables_gc_list_lock);
9750         list_splice_init(&nf_tables_gc_list, &trans_gc_list);
9751         spin_unlock(&nf_tables_gc_list_lock);
9752
9753         list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
9754                 list_del(&trans->list);
9755                 if (!nft_trans_gc_work_done(trans)) {
9756                         nft_trans_gc_destroy(trans);
9757                         continue;
9758                 }
9759                 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9760         }
9761 }
9762
9763 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
9764                                         unsigned int gc_seq, gfp_t gfp)
9765 {
9766         struct net *net = read_pnet(&set->net);
9767         struct nft_trans_gc *trans;
9768
9769         trans = kzalloc(sizeof(*trans), gfp);
9770         if (!trans)
9771                 return NULL;
9772
9773         trans->net = maybe_get_net(net);
9774         if (!trans->net) {
9775                 kfree(trans);
9776                 return NULL;
9777         }
9778
9779         refcount_inc(&set->refs);
9780         trans->set = set;
9781         trans->seq = gc_seq;
9782
9783         return trans;
9784 }
9785
9786 void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
9787 {
9788         trans->priv[trans->count++] = priv;
9789 }
9790
9791 static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
9792 {
9793         spin_lock(&nf_tables_gc_list_lock);
9794         list_add_tail(&trans->list, &nf_tables_gc_list);
9795         spin_unlock(&nf_tables_gc_list_lock);
9796
9797         schedule_work(&trans_gc_work);
9798 }
9799
9800 static int nft_trans_gc_space(struct nft_trans_gc *trans)
9801 {
9802         return NFT_TRANS_GC_BATCHCOUNT - trans->count;
9803 }
9804
9805 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
9806                                               unsigned int gc_seq, gfp_t gfp)
9807 {
9808         struct nft_set *set;
9809
9810         if (nft_trans_gc_space(gc))
9811                 return gc;
9812
9813         set = gc->set;
9814         nft_trans_gc_queue_work(gc);
9815
9816         return nft_trans_gc_alloc(set, gc_seq, gfp);
9817 }
9818
9819 void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
9820 {
9821         if (trans->count == 0) {
9822                 nft_trans_gc_destroy(trans);
9823                 return;
9824         }
9825
9826         nft_trans_gc_queue_work(trans);
9827 }
9828
9829 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
9830 {
9831         struct nft_set *set;
9832
9833         if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
9834                 return NULL;
9835
9836         if (nft_trans_gc_space(gc))
9837                 return gc;
9838
9839         set = gc->set;
9840         call_rcu(&gc->rcu, nft_trans_gc_trans_free);
9841
9842         return nft_trans_gc_alloc(set, 0, gfp);
9843 }
9844
9845 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
9846 {
9847         WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
9848
9849         if (trans->count == 0) {
9850                 nft_trans_gc_destroy(trans);
9851                 return;
9852         }
9853
9854         call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9855 }
9856
9857 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
9858                                                  unsigned int gc_seq)
9859 {
9860         struct nft_set_elem_catchall *catchall;
9861         const struct nft_set *set = gc->set;
9862         struct nft_set_ext *ext;
9863
9864         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9865                 ext = nft_set_elem_ext(set, catchall->elem);
9866
9867                 if (!nft_set_elem_expired(ext))
9868                         continue;
9869                 if (nft_set_elem_is_dead(ext))
9870                         goto dead_elem;
9871
9872                 nft_set_elem_dead(ext);
9873 dead_elem:
9874                 gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
9875                 if (!gc)
9876                         return NULL;
9877
9878                 nft_trans_gc_elem_add(gc, catchall->elem);
9879         }
9880
9881         return gc;
9882 }
9883
9884 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc)
9885 {
9886         struct nft_set_elem_catchall *catchall, *next;
9887         u64 tstamp = nft_net_tstamp(gc->net);
9888         const struct nft_set *set = gc->set;
9889         struct nft_elem_priv *elem_priv;
9890         struct nft_set_ext *ext;
9891
9892         WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net));
9893
9894         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
9895                 ext = nft_set_elem_ext(set, catchall->elem);
9896
9897                 if (!__nft_set_elem_expired(ext, tstamp))
9898                         continue;
9899
9900                 gc = nft_trans_gc_queue_sync(gc, GFP_KERNEL);
9901                 if (!gc)
9902                         return NULL;
9903
9904                 elem_priv = catchall->elem;
9905                 nft_setelem_data_deactivate(gc->net, gc->set, elem_priv);
9906                 nft_setelem_catchall_destroy(catchall);
9907                 nft_trans_gc_elem_add(gc, elem_priv);
9908         }
9909
9910         return gc;
9911 }
9912
9913 static void nf_tables_module_autoload_cleanup(struct net *net)
9914 {
9915         struct nftables_pernet *nft_net = nft_pernet(net);
9916         struct nft_module_request *req, *next;
9917
9918         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9919         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9920                 WARN_ON_ONCE(!req->done);
9921                 list_del(&req->list);
9922                 kfree(req);
9923         }
9924 }
9925
9926 static void nf_tables_commit_release(struct net *net)
9927 {
9928         struct nftables_pernet *nft_net = nft_pernet(net);
9929         struct nft_trans *trans;
9930
9931         /* all side effects have to be made visible.
9932          * For example, if a chain named 'foo' has been deleted, a
9933          * new transaction must not find it anymore.
9934          *
9935          * Memory reclaim happens asynchronously from work queue
9936          * to prevent expensive synchronize_rcu() in commit phase.
9937          */
9938         if (list_empty(&nft_net->commit_list)) {
9939                 nf_tables_module_autoload_cleanup(net);
9940                 mutex_unlock(&nft_net->commit_mutex);
9941                 return;
9942         }
9943
9944         trans = list_last_entry(&nft_net->commit_list,
9945                                 struct nft_trans, list);
9946         get_net(trans->ctx.net);
9947         WARN_ON_ONCE(trans->put_net);
9948
9949         trans->put_net = true;
9950         spin_lock(&nf_tables_destroy_list_lock);
9951         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9952         spin_unlock(&nf_tables_destroy_list_lock);
9953
9954         nf_tables_module_autoload_cleanup(net);
9955         schedule_work(&trans_destroy_work);
9956
9957         mutex_unlock(&nft_net->commit_mutex);
9958 }
9959
9960 static void nft_commit_notify(struct net *net, u32 portid)
9961 {
9962         struct nftables_pernet *nft_net = nft_pernet(net);
9963         struct sk_buff *batch_skb = NULL, *nskb, *skb;
9964         unsigned char *data;
9965         int len;
9966
9967         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9968                 if (!batch_skb) {
9969 new_batch:
9970                         batch_skb = skb;
9971                         len = NLMSG_GOODSIZE - skb->len;
9972                         list_del(&skb->list);
9973                         continue;
9974                 }
9975                 len -= skb->len;
9976                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9977                         data = skb_put(batch_skb, skb->len);
9978                         memcpy(data, skb->data, skb->len);
9979                         list_del(&skb->list);
9980                         kfree_skb(skb);
9981                         continue;
9982                 }
9983                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9984                                NFT_CB(batch_skb).report, GFP_KERNEL);
9985                 goto new_batch;
9986         }
9987
9988         if (batch_skb) {
9989                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9990                                NFT_CB(batch_skb).report, GFP_KERNEL);
9991         }
9992
9993         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9994 }
9995
9996 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9997                                         struct nft_table *table)
9998 {
9999         struct nft_audit_data *adp;
10000
10001         list_for_each_entry(adp, adl, list) {
10002                 if (adp->table == table)
10003                         return 0;
10004         }
10005         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
10006         if (!adp)
10007                 return -ENOMEM;
10008         adp->table = table;
10009         list_add(&adp->list, adl);
10010         return 0;
10011 }
10012
10013 static void nf_tables_commit_audit_free(struct list_head *adl)
10014 {
10015         struct nft_audit_data *adp, *adn;
10016
10017         list_for_each_entry_safe(adp, adn, adl, list) {
10018                 list_del(&adp->list);
10019                 kfree(adp);
10020         }
10021 }
10022
10023 static void nf_tables_commit_audit_collect(struct list_head *adl,
10024                                            struct nft_table *table, u32 op)
10025 {
10026         struct nft_audit_data *adp;
10027
10028         list_for_each_entry(adp, adl, list) {
10029                 if (adp->table == table)
10030                         goto found;
10031         }
10032         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
10033         return;
10034 found:
10035         adp->entries++;
10036         if (!adp->op || adp->op > op)
10037                 adp->op = op;
10038 }
10039
10040 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
10041
10042 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
10043 {
10044         struct nft_audit_data *adp, *adn;
10045         char aubuf[AUNFTABLENAMELEN];
10046
10047         list_for_each_entry_safe(adp, adn, adl, list) {
10048                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
10049                          generation);
10050                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
10051                                 nft2audit_op[adp->op], GFP_KERNEL);
10052                 list_del(&adp->list);
10053                 kfree(adp);
10054         }
10055 }
10056
10057 static void nft_set_commit_update(struct list_head *set_update_list)
10058 {
10059         struct nft_set *set, *next;
10060
10061         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10062                 list_del_init(&set->pending_update);
10063
10064                 if (!set->ops->commit || set->dead)
10065                         continue;
10066
10067                 set->ops->commit(set);
10068         }
10069 }
10070
10071 static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
10072 {
10073         unsigned int gc_seq;
10074
10075         /* Bump gc counter, it becomes odd, this is the busy mark. */
10076         gc_seq = READ_ONCE(nft_net->gc_seq);
10077         WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
10078
10079         return gc_seq;
10080 }
10081
10082 static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
10083 {
10084         WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
10085 }
10086
10087 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
10088 {
10089         struct nftables_pernet *nft_net = nft_pernet(net);
10090         struct nft_trans *trans, *next;
10091         unsigned int base_seq, gc_seq;
10092         LIST_HEAD(set_update_list);
10093         struct nft_trans_elem *te;
10094         struct nft_chain *chain;
10095         struct nft_table *table;
10096         LIST_HEAD(adl);
10097         int err;
10098
10099         if (list_empty(&nft_net->commit_list)) {
10100                 mutex_unlock(&nft_net->commit_mutex);
10101                 return 0;
10102         }
10103
10104         list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
10105                 switch (trans->msg_type) {
10106                 case NFT_MSG_NEWSET:
10107                         if (!nft_trans_set_update(trans) &&
10108                             nft_set_is_anonymous(nft_trans_set(trans)) &&
10109                             !nft_trans_set_bound(trans)) {
10110                                 pr_warn_once("nftables ruleset with unbound set\n");
10111                                 return -EINVAL;
10112                         }
10113                         break;
10114                 case NFT_MSG_NEWCHAIN:
10115                         if (!nft_trans_chain_update(trans) &&
10116                             nft_chain_binding(nft_trans_chain(trans)) &&
10117                             !nft_trans_chain_bound(trans)) {
10118                                 pr_warn_once("nftables ruleset with unbound chain\n");
10119                                 return -EINVAL;
10120                         }
10121                         break;
10122                 }
10123         }
10124
10125         /* 0. Validate ruleset, otherwise roll back for error reporting. */
10126         if (nf_tables_validate(net) < 0) {
10127                 nft_net->validate_state = NFT_VALIDATE_DO;
10128                 return -EAGAIN;
10129         }
10130
10131         err = nft_flow_rule_offload_commit(net);
10132         if (err < 0)
10133                 return err;
10134
10135         /* 1.  Allocate space for next generation rules_gen_X[] */
10136         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10137                 int ret;
10138
10139                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
10140                 if (ret) {
10141                         nf_tables_commit_chain_prepare_cancel(net);
10142                         nf_tables_commit_audit_free(&adl);
10143                         return ret;
10144                 }
10145                 if (trans->msg_type == NFT_MSG_NEWRULE ||
10146                     trans->msg_type == NFT_MSG_DELRULE) {
10147                         chain = trans->ctx.chain;
10148
10149                         ret = nf_tables_commit_chain_prepare(net, chain);
10150                         if (ret < 0) {
10151                                 nf_tables_commit_chain_prepare_cancel(net);
10152                                 nf_tables_commit_audit_free(&adl);
10153                                 return ret;
10154                         }
10155                 }
10156         }
10157
10158         /* step 2.  Make rules_gen_X visible to packet path */
10159         list_for_each_entry(table, &nft_net->tables, list) {
10160                 list_for_each_entry(chain, &table->chains, list)
10161                         nf_tables_commit_chain(net, chain);
10162         }
10163
10164         /*
10165          * Bump generation counter, invalidate any dump in progress.
10166          * Cannot fail after this point.
10167          */
10168         base_seq = READ_ONCE(nft_net->base_seq);
10169         while (++base_seq == 0)
10170                 ;
10171
10172         WRITE_ONCE(nft_net->base_seq, base_seq);
10173
10174         gc_seq = nft_gc_seq_begin(nft_net);
10175
10176         /* step 3. Start new generation, rules_gen_X now in use. */
10177         net->nft.gencursor = nft_gencursor_next(net);
10178
10179         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10180                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
10181                                                trans->msg_type);
10182                 switch (trans->msg_type) {
10183                 case NFT_MSG_NEWTABLE:
10184                         if (nft_trans_table_update(trans)) {
10185                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10186                                         nft_trans_destroy(trans);
10187                                         break;
10188                                 }
10189                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
10190                                         nf_tables_table_disable(net, trans->ctx.table);
10191
10192                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10193                         } else {
10194                                 nft_clear(net, trans->ctx.table);
10195                         }
10196                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
10197                         nft_trans_destroy(trans);
10198                         break;
10199                 case NFT_MSG_DELTABLE:
10200                 case NFT_MSG_DESTROYTABLE:
10201                         list_del_rcu(&trans->ctx.table->list);
10202                         nf_tables_table_notify(&trans->ctx, trans->msg_type);
10203                         break;
10204                 case NFT_MSG_NEWCHAIN:
10205                         if (nft_trans_chain_update(trans)) {
10206                                 nft_chain_commit_update(trans);
10207                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
10208                                                        &nft_trans_chain_hooks(trans));
10209                                 list_splice(&nft_trans_chain_hooks(trans),
10210                                             &nft_trans_basechain(trans)->hook_list);
10211                                 /* trans destroyed after rcu grace period */
10212                         } else {
10213                                 nft_chain_commit_drop_policy(trans);
10214                                 nft_clear(net, trans->ctx.chain);
10215                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
10216                                 nft_trans_destroy(trans);
10217                         }
10218                         break;
10219                 case NFT_MSG_DELCHAIN:
10220                 case NFT_MSG_DESTROYCHAIN:
10221                         if (nft_trans_chain_update(trans)) {
10222                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10223                                                        &nft_trans_chain_hooks(trans));
10224                                 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT)) {
10225                                         nft_netdev_unregister_hooks(net,
10226                                                                     &nft_trans_chain_hooks(trans),
10227                                                                     true);
10228                                 }
10229                         } else {
10230                                 nft_chain_del(trans->ctx.chain);
10231                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10232                                                        NULL);
10233                                 nf_tables_unregister_hook(trans->ctx.net,
10234                                                           trans->ctx.table,
10235                                                           trans->ctx.chain);
10236                         }
10237                         break;
10238                 case NFT_MSG_NEWRULE:
10239                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
10240                         nf_tables_rule_notify(&trans->ctx,
10241                                               nft_trans_rule(trans),
10242                                               NFT_MSG_NEWRULE);
10243                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10244                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10245
10246                         nft_trans_destroy(trans);
10247                         break;
10248                 case NFT_MSG_DELRULE:
10249                 case NFT_MSG_DESTROYRULE:
10250                         list_del_rcu(&nft_trans_rule(trans)->list);
10251                         nf_tables_rule_notify(&trans->ctx,
10252                                               nft_trans_rule(trans),
10253                                               trans->msg_type);
10254                         nft_rule_expr_deactivate(&trans->ctx,
10255                                                  nft_trans_rule(trans),
10256                                                  NFT_TRANS_COMMIT);
10257
10258                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10259                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10260                         break;
10261                 case NFT_MSG_NEWSET:
10262                         if (nft_trans_set_update(trans)) {
10263                                 struct nft_set *set = nft_trans_set(trans);
10264
10265                                 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
10266                                 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
10267
10268                                 if (nft_trans_set_size(trans))
10269                                         WRITE_ONCE(set->size, nft_trans_set_size(trans));
10270                         } else {
10271                                 nft_clear(net, nft_trans_set(trans));
10272                                 /* This avoids hitting -EBUSY when deleting the table
10273                                  * from the transaction.
10274                                  */
10275                                 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
10276                                     !list_empty(&nft_trans_set(trans)->bindings))
10277                                         nft_use_dec(&trans->ctx.table->use);
10278                         }
10279                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10280                                              NFT_MSG_NEWSET, GFP_KERNEL);
10281                         nft_trans_destroy(trans);
10282                         break;
10283                 case NFT_MSG_DELSET:
10284                 case NFT_MSG_DESTROYSET:
10285                         nft_trans_set(trans)->dead = 1;
10286                         list_del_rcu(&nft_trans_set(trans)->list);
10287                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10288                                              trans->msg_type, GFP_KERNEL);
10289                         break;
10290                 case NFT_MSG_NEWSETELEM:
10291                         te = (struct nft_trans_elem *)trans->data;
10292
10293                         nft_setelem_activate(net, te->set, te->elem_priv);
10294                         nf_tables_setelem_notify(&trans->ctx, te->set,
10295                                                  te->elem_priv,
10296                                                  NFT_MSG_NEWSETELEM);
10297                         if (te->set->ops->commit &&
10298                             list_empty(&te->set->pending_update)) {
10299                                 list_add_tail(&te->set->pending_update,
10300                                               &set_update_list);
10301                         }
10302                         nft_trans_destroy(trans);
10303                         break;
10304                 case NFT_MSG_DELSETELEM:
10305                 case NFT_MSG_DESTROYSETELEM:
10306                         te = (struct nft_trans_elem *)trans->data;
10307
10308                         nf_tables_setelem_notify(&trans->ctx, te->set,
10309                                                  te->elem_priv,
10310                                                  trans->msg_type);
10311                         nft_setelem_remove(net, te->set, te->elem_priv);
10312                         if (!nft_setelem_is_catchall(te->set, te->elem_priv)) {
10313                                 atomic_dec(&te->set->nelems);
10314                                 te->set->ndeact--;
10315                         }
10316                         if (te->set->ops->commit &&
10317                             list_empty(&te->set->pending_update)) {
10318                                 list_add_tail(&te->set->pending_update,
10319                                               &set_update_list);
10320                         }
10321                         break;
10322                 case NFT_MSG_NEWOBJ:
10323                         if (nft_trans_obj_update(trans)) {
10324                                 nft_obj_commit_update(trans);
10325                                 nf_tables_obj_notify(&trans->ctx,
10326                                                      nft_trans_obj(trans),
10327                                                      NFT_MSG_NEWOBJ);
10328                         } else {
10329                                 nft_clear(net, nft_trans_obj(trans));
10330                                 nf_tables_obj_notify(&trans->ctx,
10331                                                      nft_trans_obj(trans),
10332                                                      NFT_MSG_NEWOBJ);
10333                                 nft_trans_destroy(trans);
10334                         }
10335                         break;
10336                 case NFT_MSG_DELOBJ:
10337                 case NFT_MSG_DESTROYOBJ:
10338                         nft_obj_del(nft_trans_obj(trans));
10339                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
10340                                              trans->msg_type);
10341                         break;
10342                 case NFT_MSG_NEWFLOWTABLE:
10343                         if (nft_trans_flowtable_update(trans)) {
10344                                 nft_trans_flowtable(trans)->data.flags =
10345                                         nft_trans_flowtable_flags(trans);
10346                                 nf_tables_flowtable_notify(&trans->ctx,
10347                                                            nft_trans_flowtable(trans),
10348                                                            &nft_trans_flowtable_hooks(trans),
10349                                                            NFT_MSG_NEWFLOWTABLE);
10350                                 list_splice(&nft_trans_flowtable_hooks(trans),
10351                                             &nft_trans_flowtable(trans)->hook_list);
10352                         } else {
10353                                 nft_clear(net, nft_trans_flowtable(trans));
10354                                 nf_tables_flowtable_notify(&trans->ctx,
10355                                                            nft_trans_flowtable(trans),
10356                                                            NULL,
10357                                                            NFT_MSG_NEWFLOWTABLE);
10358                         }
10359                         nft_trans_destroy(trans);
10360                         break;
10361                 case NFT_MSG_DELFLOWTABLE:
10362                 case NFT_MSG_DESTROYFLOWTABLE:
10363                         if (nft_trans_flowtable_update(trans)) {
10364                                 nf_tables_flowtable_notify(&trans->ctx,
10365                                                            nft_trans_flowtable(trans),
10366                                                            &nft_trans_flowtable_hooks(trans),
10367                                                            trans->msg_type);
10368                                 nft_unregister_flowtable_net_hooks(net,
10369                                                                    &nft_trans_flowtable_hooks(trans));
10370                         } else {
10371                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10372                                 nf_tables_flowtable_notify(&trans->ctx,
10373                                                            nft_trans_flowtable(trans),
10374                                                            NULL,
10375                                                            trans->msg_type);
10376                                 nft_unregister_flowtable_net_hooks(net,
10377                                                 &nft_trans_flowtable(trans)->hook_list);
10378                         }
10379                         break;
10380                 }
10381         }
10382
10383         nft_set_commit_update(&set_update_list);
10384
10385         nft_commit_notify(net, NETLINK_CB(skb).portid);
10386         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
10387         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
10388
10389         nft_gc_seq_end(nft_net, gc_seq);
10390         nft_net->validate_state = NFT_VALIDATE_SKIP;
10391         nf_tables_commit_release(net);
10392
10393         return 0;
10394 }
10395
10396 static void nf_tables_module_autoload(struct net *net)
10397 {
10398         struct nftables_pernet *nft_net = nft_pernet(net);
10399         struct nft_module_request *req, *next;
10400         LIST_HEAD(module_list);
10401
10402         list_splice_init(&nft_net->module_list, &module_list);
10403         mutex_unlock(&nft_net->commit_mutex);
10404         list_for_each_entry_safe(req, next, &module_list, list) {
10405                 request_module("%s", req->module);
10406                 req->done = true;
10407         }
10408         mutex_lock(&nft_net->commit_mutex);
10409         list_splice(&module_list, &nft_net->module_list);
10410 }
10411
10412 static void nf_tables_abort_release(struct nft_trans *trans)
10413 {
10414         switch (trans->msg_type) {
10415         case NFT_MSG_NEWTABLE:
10416                 nf_tables_table_destroy(&trans->ctx);
10417                 break;
10418         case NFT_MSG_NEWCHAIN:
10419                 if (nft_trans_chain_update(trans))
10420                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
10421                 else
10422                         nf_tables_chain_destroy(&trans->ctx);
10423                 break;
10424         case NFT_MSG_NEWRULE:
10425                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
10426                 break;
10427         case NFT_MSG_NEWSET:
10428                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
10429                 break;
10430         case NFT_MSG_NEWSETELEM:
10431                 nft_set_elem_destroy(nft_trans_elem_set(trans),
10432                                      nft_trans_elem_priv(trans), true);
10433                 break;
10434         case NFT_MSG_NEWOBJ:
10435                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
10436                 break;
10437         case NFT_MSG_NEWFLOWTABLE:
10438                 if (nft_trans_flowtable_update(trans))
10439                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
10440                 else
10441                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
10442                 break;
10443         }
10444         kfree(trans);
10445 }
10446
10447 static void nft_set_abort_update(struct list_head *set_update_list)
10448 {
10449         struct nft_set *set, *next;
10450
10451         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10452                 list_del_init(&set->pending_update);
10453
10454                 if (!set->ops->abort)
10455                         continue;
10456
10457                 set->ops->abort(set);
10458         }
10459 }
10460
10461 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
10462 {
10463         struct nftables_pernet *nft_net = nft_pernet(net);
10464         struct nft_trans *trans, *next;
10465         LIST_HEAD(set_update_list);
10466         struct nft_trans_elem *te;
10467         int err = 0;
10468
10469         if (action == NFNL_ABORT_VALIDATE &&
10470             nf_tables_validate(net) < 0)
10471                 err = -EAGAIN;
10472
10473         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
10474                                          list) {
10475                 switch (trans->msg_type) {
10476                 case NFT_MSG_NEWTABLE:
10477                         if (nft_trans_table_update(trans)) {
10478                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10479                                         nft_trans_destroy(trans);
10480                                         break;
10481                                 }
10482                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
10483                                         nf_tables_table_disable(net, trans->ctx.table);
10484                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
10485                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
10486                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
10487                                 }
10488                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_ORPHAN) {
10489                                         trans->ctx.table->flags &= ~NFT_TABLE_F_OWNER;
10490                                         trans->ctx.table->nlpid = 0;
10491                                 }
10492                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10493                                 nft_trans_destroy(trans);
10494                         } else {
10495                                 list_del_rcu(&trans->ctx.table->list);
10496                         }
10497                         break;
10498                 case NFT_MSG_DELTABLE:
10499                 case NFT_MSG_DESTROYTABLE:
10500                         nft_clear(trans->ctx.net, trans->ctx.table);
10501                         nft_trans_destroy(trans);
10502                         break;
10503                 case NFT_MSG_NEWCHAIN:
10504                         if (nft_trans_chain_update(trans)) {
10505                                 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT)) {
10506                                         nft_netdev_unregister_hooks(net,
10507                                                                     &nft_trans_chain_hooks(trans),
10508                                                                     true);
10509                                 }
10510                                 free_percpu(nft_trans_chain_stats(trans));
10511                                 kfree(nft_trans_chain_name(trans));
10512                                 nft_trans_destroy(trans);
10513                         } else {
10514                                 if (nft_trans_chain_bound(trans)) {
10515                                         nft_trans_destroy(trans);
10516                                         break;
10517                                 }
10518                                 nft_use_dec_restore(&trans->ctx.table->use);
10519                                 nft_chain_del(trans->ctx.chain);
10520                                 nf_tables_unregister_hook(trans->ctx.net,
10521                                                           trans->ctx.table,
10522                                                           trans->ctx.chain);
10523                         }
10524                         break;
10525                 case NFT_MSG_DELCHAIN:
10526                 case NFT_MSG_DESTROYCHAIN:
10527                         if (nft_trans_chain_update(trans)) {
10528                                 list_splice(&nft_trans_chain_hooks(trans),
10529                                             &nft_trans_basechain(trans)->hook_list);
10530                         } else {
10531                                 nft_use_inc_restore(&trans->ctx.table->use);
10532                                 nft_clear(trans->ctx.net, trans->ctx.chain);
10533                         }
10534                         nft_trans_destroy(trans);
10535                         break;
10536                 case NFT_MSG_NEWRULE:
10537                         if (nft_trans_rule_bound(trans)) {
10538                                 nft_trans_destroy(trans);
10539                                 break;
10540                         }
10541                         nft_use_dec_restore(&trans->ctx.chain->use);
10542                         list_del_rcu(&nft_trans_rule(trans)->list);
10543                         nft_rule_expr_deactivate(&trans->ctx,
10544                                                  nft_trans_rule(trans),
10545                                                  NFT_TRANS_ABORT);
10546                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10547                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10548                         break;
10549                 case NFT_MSG_DELRULE:
10550                 case NFT_MSG_DESTROYRULE:
10551                         nft_use_inc_restore(&trans->ctx.chain->use);
10552                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
10553                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10554                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10555                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10556
10557                         nft_trans_destroy(trans);
10558                         break;
10559                 case NFT_MSG_NEWSET:
10560                         if (nft_trans_set_update(trans)) {
10561                                 nft_trans_destroy(trans);
10562                                 break;
10563                         }
10564                         nft_use_dec_restore(&trans->ctx.table->use);
10565                         if (nft_trans_set_bound(trans)) {
10566                                 nft_trans_destroy(trans);
10567                                 break;
10568                         }
10569                         nft_trans_set(trans)->dead = 1;
10570                         list_del_rcu(&nft_trans_set(trans)->list);
10571                         break;
10572                 case NFT_MSG_DELSET:
10573                 case NFT_MSG_DESTROYSET:
10574                         nft_use_inc_restore(&trans->ctx.table->use);
10575                         nft_clear(trans->ctx.net, nft_trans_set(trans));
10576                         if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10577                                 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10578
10579                         nft_trans_destroy(trans);
10580                         break;
10581                 case NFT_MSG_NEWSETELEM:
10582                         if (nft_trans_elem_set_bound(trans)) {
10583                                 nft_trans_destroy(trans);
10584                                 break;
10585                         }
10586                         te = (struct nft_trans_elem *)trans->data;
10587                         nft_setelem_remove(net, te->set, te->elem_priv);
10588                         if (!nft_setelem_is_catchall(te->set, te->elem_priv))
10589                                 atomic_dec(&te->set->nelems);
10590
10591                         if (te->set->ops->abort &&
10592                             list_empty(&te->set->pending_update)) {
10593                                 list_add_tail(&te->set->pending_update,
10594                                               &set_update_list);
10595                         }
10596                         break;
10597                 case NFT_MSG_DELSETELEM:
10598                 case NFT_MSG_DESTROYSETELEM:
10599                         te = (struct nft_trans_elem *)trans->data;
10600
10601                         nft_setelem_data_activate(net, te->set, te->elem_priv);
10602                         nft_setelem_activate(net, te->set, te->elem_priv);
10603                         if (!nft_setelem_is_catchall(te->set, te->elem_priv))
10604                                 te->set->ndeact--;
10605
10606                         if (te->set->ops->abort &&
10607                             list_empty(&te->set->pending_update)) {
10608                                 list_add_tail(&te->set->pending_update,
10609                                               &set_update_list);
10610                         }
10611                         nft_trans_destroy(trans);
10612                         break;
10613                 case NFT_MSG_NEWOBJ:
10614                         if (nft_trans_obj_update(trans)) {
10615                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10616                                 nft_trans_destroy(trans);
10617                         } else {
10618                                 nft_use_dec_restore(&trans->ctx.table->use);
10619                                 nft_obj_del(nft_trans_obj(trans));
10620                         }
10621                         break;
10622                 case NFT_MSG_DELOBJ:
10623                 case NFT_MSG_DESTROYOBJ:
10624                         nft_use_inc_restore(&trans->ctx.table->use);
10625                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
10626                         nft_trans_destroy(trans);
10627                         break;
10628                 case NFT_MSG_NEWFLOWTABLE:
10629                         if (nft_trans_flowtable_update(trans)) {
10630                                 nft_unregister_flowtable_net_hooks(net,
10631                                                 &nft_trans_flowtable_hooks(trans));
10632                         } else {
10633                                 nft_use_dec_restore(&trans->ctx.table->use);
10634                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10635                                 nft_unregister_flowtable_net_hooks(net,
10636                                                 &nft_trans_flowtable(trans)->hook_list);
10637                         }
10638                         break;
10639                 case NFT_MSG_DELFLOWTABLE:
10640                 case NFT_MSG_DESTROYFLOWTABLE:
10641                         if (nft_trans_flowtable_update(trans)) {
10642                                 list_splice(&nft_trans_flowtable_hooks(trans),
10643                                             &nft_trans_flowtable(trans)->hook_list);
10644                         } else {
10645                                 nft_use_inc_restore(&trans->ctx.table->use);
10646                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10647                         }
10648                         nft_trans_destroy(trans);
10649                         break;
10650                 }
10651         }
10652
10653         nft_set_abort_update(&set_update_list);
10654
10655         synchronize_rcu();
10656
10657         list_for_each_entry_safe_reverse(trans, next,
10658                                          &nft_net->commit_list, list) {
10659                 nft_trans_list_del(trans);
10660                 nf_tables_abort_release(trans);
10661         }
10662
10663         return err;
10664 }
10665
10666 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10667                            enum nfnl_abort_action action)
10668 {
10669         struct nftables_pernet *nft_net = nft_pernet(net);
10670         unsigned int gc_seq;
10671         int ret;
10672
10673         gc_seq = nft_gc_seq_begin(nft_net);
10674         ret = __nf_tables_abort(net, action);
10675         nft_gc_seq_end(nft_net, gc_seq);
10676
10677         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
10678
10679         /* module autoload needs to happen after GC sequence update because it
10680          * temporarily releases and grabs mutex again.
10681          */
10682         if (action == NFNL_ABORT_AUTOLOAD)
10683                 nf_tables_module_autoload(net);
10684         else
10685                 nf_tables_module_autoload_cleanup(net);
10686
10687         mutex_unlock(&nft_net->commit_mutex);
10688
10689         return ret;
10690 }
10691
10692 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10693 {
10694         struct nftables_pernet *nft_net = nft_pernet(net);
10695         bool genid_ok;
10696
10697         mutex_lock(&nft_net->commit_mutex);
10698         nft_net->tstamp = get_jiffies_64();
10699
10700         genid_ok = genid == 0 || nft_net->base_seq == genid;
10701         if (!genid_ok)
10702                 mutex_unlock(&nft_net->commit_mutex);
10703
10704         /* else, commit mutex has to be released by commit or abort function */
10705         return genid_ok;
10706 }
10707
10708 static const struct nfnetlink_subsystem nf_tables_subsys = {
10709         .name           = "nf_tables",
10710         .subsys_id      = NFNL_SUBSYS_NFTABLES,
10711         .cb_count       = NFT_MSG_MAX,
10712         .cb             = nf_tables_cb,
10713         .commit         = nf_tables_commit,
10714         .abort          = nf_tables_abort,
10715         .valid_genid    = nf_tables_valid_genid,
10716         .owner          = THIS_MODULE,
10717 };
10718
10719 int nft_chain_validate_dependency(const struct nft_chain *chain,
10720                                   enum nft_chain_types type)
10721 {
10722         const struct nft_base_chain *basechain;
10723
10724         if (nft_is_base_chain(chain)) {
10725                 basechain = nft_base_chain(chain);
10726                 if (basechain->type->type != type)
10727                         return -EOPNOTSUPP;
10728         }
10729         return 0;
10730 }
10731 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10732
10733 int nft_chain_validate_hooks(const struct nft_chain *chain,
10734                              unsigned int hook_flags)
10735 {
10736         struct nft_base_chain *basechain;
10737
10738         if (nft_is_base_chain(chain)) {
10739                 basechain = nft_base_chain(chain);
10740
10741                 if ((1 << basechain->ops.hooknum) & hook_flags)
10742                         return 0;
10743
10744                 return -EOPNOTSUPP;
10745         }
10746
10747         return 0;
10748 }
10749 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10750
10751 /*
10752  * Loop detection - walk through the ruleset beginning at the destination chain
10753  * of a new jump until either the source chain is reached (loop) or all
10754  * reachable chains have been traversed.
10755  *
10756  * The loop check is performed whenever a new jump verdict is added to an
10757  * expression or verdict map or a verdict map is bound to a new chain.
10758  */
10759
10760 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10761                                  const struct nft_chain *chain);
10762
10763 static int nft_check_loops(const struct nft_ctx *ctx,
10764                            const struct nft_set_ext *ext)
10765 {
10766         const struct nft_data *data;
10767         int ret;
10768
10769         data = nft_set_ext_data(ext);
10770         switch (data->verdict.code) {
10771         case NFT_JUMP:
10772         case NFT_GOTO:
10773                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10774                 break;
10775         default:
10776                 ret = 0;
10777                 break;
10778         }
10779
10780         return ret;
10781 }
10782
10783 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10784                                         struct nft_set *set,
10785                                         const struct nft_set_iter *iter,
10786                                         struct nft_elem_priv *elem_priv)
10787 {
10788         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
10789
10790         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10791             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10792                 return 0;
10793
10794         return nft_check_loops(ctx, ext);
10795 }
10796
10797 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10798                                   struct nft_set *set)
10799 {
10800         u8 genmask = nft_genmask_next(ctx->net);
10801         struct nft_set_elem_catchall *catchall;
10802         struct nft_set_ext *ext;
10803         int ret = 0;
10804
10805         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10806                 ext = nft_set_elem_ext(set, catchall->elem);
10807                 if (!nft_set_elem_active(ext, genmask))
10808                         continue;
10809
10810                 ret = nft_check_loops(ctx, ext);
10811                 if (ret < 0)
10812                         return ret;
10813         }
10814
10815         return ret;
10816 }
10817
10818 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10819                                  const struct nft_chain *chain)
10820 {
10821         const struct nft_rule *rule;
10822         const struct nft_expr *expr, *last;
10823         struct nft_set *set;
10824         struct nft_set_binding *binding;
10825         struct nft_set_iter iter;
10826
10827         if (ctx->chain == chain)
10828                 return -ELOOP;
10829
10830         if (fatal_signal_pending(current))
10831                 return -EINTR;
10832
10833         list_for_each_entry(rule, &chain->rules, list) {
10834                 nft_rule_for_each_expr(expr, last, rule) {
10835                         struct nft_immediate_expr *priv;
10836                         const struct nft_data *data;
10837                         int err;
10838
10839                         if (strcmp(expr->ops->type->name, "immediate"))
10840                                 continue;
10841
10842                         priv = nft_expr_priv(expr);
10843                         if (priv->dreg != NFT_REG_VERDICT)
10844                                 continue;
10845
10846                         data = &priv->data;
10847                         switch (data->verdict.code) {
10848                         case NFT_JUMP:
10849                         case NFT_GOTO:
10850                                 err = nf_tables_check_loops(ctx,
10851                                                         data->verdict.chain);
10852                                 if (err < 0)
10853                                         return err;
10854                                 break;
10855                         default:
10856                                 break;
10857                         }
10858                 }
10859         }
10860
10861         list_for_each_entry(set, &ctx->table->sets, list) {
10862                 if (!nft_is_active_next(ctx->net, set))
10863                         continue;
10864                 if (!(set->flags & NFT_SET_MAP) ||
10865                     set->dtype != NFT_DATA_VERDICT)
10866                         continue;
10867
10868                 list_for_each_entry(binding, &set->bindings, list) {
10869                         if (!(binding->flags & NFT_SET_MAP) ||
10870                             binding->chain != chain)
10871                                 continue;
10872
10873                         iter.genmask    = nft_genmask_next(ctx->net);
10874                         iter.skip       = 0;
10875                         iter.count      = 0;
10876                         iter.err        = 0;
10877                         iter.fn         = nf_tables_loop_check_setelem;
10878
10879                         set->ops->walk(ctx, set, &iter);
10880                         if (!iter.err)
10881                                 iter.err = nft_set_catchall_loops(ctx, set);
10882
10883                         if (iter.err < 0)
10884                                 return iter.err;
10885                 }
10886         }
10887
10888         return 0;
10889 }
10890
10891 /**
10892  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
10893  *
10894  *      @attr: netlink attribute to fetch value from
10895  *      @max: maximum value to be stored in dest
10896  *      @dest: pointer to the variable
10897  *
10898  *      Parse, check and store a given u32 netlink attribute into variable.
10899  *      This function returns -ERANGE if the value goes over maximum value.
10900  *      Otherwise a 0 is returned and the attribute value is stored in the
10901  *      destination variable.
10902  */
10903 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10904 {
10905         u32 val;
10906
10907         val = ntohl(nla_get_be32(attr));
10908         if (val > max)
10909                 return -ERANGE;
10910
10911         *dest = val;
10912         return 0;
10913 }
10914 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10915
10916 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10917 {
10918         unsigned int reg;
10919
10920         reg = ntohl(nla_get_be32(attr));
10921         switch (reg) {
10922         case NFT_REG_VERDICT...NFT_REG_4:
10923                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10924                 break;
10925         case NFT_REG32_00...NFT_REG32_15:
10926                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10927                 break;
10928         default:
10929                 return -ERANGE;
10930         }
10931
10932         return 0;
10933 }
10934
10935 /**
10936  *      nft_dump_register - dump a register value to a netlink attribute
10937  *
10938  *      @skb: socket buffer
10939  *      @attr: attribute number
10940  *      @reg: register number
10941  *
10942  *      Construct a netlink attribute containing the register number. For
10943  *      compatibility reasons, register numbers being a multiple of 4 are
10944  *      translated to the corresponding 128 bit register numbers.
10945  */
10946 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10947 {
10948         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10949                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10950         else
10951                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10952
10953         return nla_put_be32(skb, attr, htonl(reg));
10954 }
10955 EXPORT_SYMBOL_GPL(nft_dump_register);
10956
10957 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10958 {
10959         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10960                 return -EINVAL;
10961         if (len == 0)
10962                 return -EINVAL;
10963         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10964                 return -ERANGE;
10965
10966         return 0;
10967 }
10968
10969 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10970 {
10971         u32 reg;
10972         int err;
10973
10974         err = nft_parse_register(attr, &reg);
10975         if (err < 0)
10976                 return err;
10977
10978         err = nft_validate_register_load(reg, len);
10979         if (err < 0)
10980                 return err;
10981
10982         *sreg = reg;
10983         return 0;
10984 }
10985 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10986
10987 static int nft_validate_register_store(const struct nft_ctx *ctx,
10988                                        enum nft_registers reg,
10989                                        const struct nft_data *data,
10990                                        enum nft_data_types type,
10991                                        unsigned int len)
10992 {
10993         int err;
10994
10995         switch (reg) {
10996         case NFT_REG_VERDICT:
10997                 if (type != NFT_DATA_VERDICT)
10998                         return -EINVAL;
10999
11000                 if (data != NULL &&
11001                     (data->verdict.code == NFT_GOTO ||
11002                      data->verdict.code == NFT_JUMP)) {
11003                         err = nf_tables_check_loops(ctx, data->verdict.chain);
11004                         if (err < 0)
11005                                 return err;
11006                 }
11007
11008                 return 0;
11009         default:
11010                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
11011                         return -EINVAL;
11012                 if (len == 0)
11013                         return -EINVAL;
11014                 if (reg * NFT_REG32_SIZE + len >
11015                     sizeof_field(struct nft_regs, data))
11016                         return -ERANGE;
11017
11018                 if (data != NULL && type != NFT_DATA_VALUE)
11019                         return -EINVAL;
11020                 return 0;
11021         }
11022 }
11023
11024 int nft_parse_register_store(const struct nft_ctx *ctx,
11025                              const struct nlattr *attr, u8 *dreg,
11026                              const struct nft_data *data,
11027                              enum nft_data_types type, unsigned int len)
11028 {
11029         int err;
11030         u32 reg;
11031
11032         err = nft_parse_register(attr, &reg);
11033         if (err < 0)
11034                 return err;
11035
11036         err = nft_validate_register_store(ctx, reg, data, type, len);
11037         if (err < 0)
11038                 return err;
11039
11040         *dreg = reg;
11041         return 0;
11042 }
11043 EXPORT_SYMBOL_GPL(nft_parse_register_store);
11044
11045 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
11046         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
11047         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
11048                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
11049         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
11050 };
11051
11052 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
11053                             struct nft_data_desc *desc, const struct nlattr *nla)
11054 {
11055         u8 genmask = nft_genmask_next(ctx->net);
11056         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
11057         struct nft_chain *chain;
11058         int err;
11059
11060         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
11061                                           nft_verdict_policy, NULL);
11062         if (err < 0)
11063                 return err;
11064
11065         if (!tb[NFTA_VERDICT_CODE])
11066                 return -EINVAL;
11067
11068         /* zero padding hole for memcmp */
11069         memset(data, 0, sizeof(*data));
11070         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
11071
11072         switch (data->verdict.code) {
11073         case NF_ACCEPT:
11074         case NF_DROP:
11075         case NF_QUEUE:
11076                 break;
11077         case NFT_CONTINUE:
11078         case NFT_BREAK:
11079         case NFT_RETURN:
11080                 break;
11081         case NFT_JUMP:
11082         case NFT_GOTO:
11083                 if (tb[NFTA_VERDICT_CHAIN]) {
11084                         chain = nft_chain_lookup(ctx->net, ctx->table,
11085                                                  tb[NFTA_VERDICT_CHAIN],
11086                                                  genmask);
11087                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
11088                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
11089                                                       tb[NFTA_VERDICT_CHAIN_ID],
11090                                                       genmask);
11091                         if (IS_ERR(chain))
11092                                 return PTR_ERR(chain);
11093                 } else {
11094                         return -EINVAL;
11095                 }
11096
11097                 if (IS_ERR(chain))
11098                         return PTR_ERR(chain);
11099                 if (nft_is_base_chain(chain))
11100                         return -EOPNOTSUPP;
11101                 if (nft_chain_is_bound(chain))
11102                         return -EINVAL;
11103                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
11104                     chain->flags & NFT_CHAIN_BINDING)
11105                         return -EINVAL;
11106                 if (!nft_use_inc(&chain->use))
11107                         return -EMFILE;
11108
11109                 data->verdict.chain = chain;
11110                 break;
11111         default:
11112                 return -EINVAL;
11113         }
11114
11115         desc->len = sizeof(data->verdict);
11116
11117         return 0;
11118 }
11119
11120 static void nft_verdict_uninit(const struct nft_data *data)
11121 {
11122         struct nft_chain *chain;
11123
11124         switch (data->verdict.code) {
11125         case NFT_JUMP:
11126         case NFT_GOTO:
11127                 chain = data->verdict.chain;
11128                 nft_use_dec(&chain->use);
11129                 break;
11130         }
11131 }
11132
11133 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
11134 {
11135         struct nlattr *nest;
11136
11137         nest = nla_nest_start_noflag(skb, type);
11138         if (!nest)
11139                 goto nla_put_failure;
11140
11141         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
11142                 goto nla_put_failure;
11143
11144         switch (v->code) {
11145         case NFT_JUMP:
11146         case NFT_GOTO:
11147                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
11148                                    v->chain->name))
11149                         goto nla_put_failure;
11150         }
11151         nla_nest_end(skb, nest);
11152         return 0;
11153
11154 nla_put_failure:
11155         return -1;
11156 }
11157
11158 static int nft_value_init(const struct nft_ctx *ctx,
11159                           struct nft_data *data, struct nft_data_desc *desc,
11160                           const struct nlattr *nla)
11161 {
11162         unsigned int len;
11163
11164         len = nla_len(nla);
11165         if (len == 0)
11166                 return -EINVAL;
11167         if (len > desc->size)
11168                 return -EOVERFLOW;
11169         if (desc->len) {
11170                 if (len != desc->len)
11171                         return -EINVAL;
11172         } else {
11173                 desc->len = len;
11174         }
11175
11176         nla_memcpy(data->data, nla, len);
11177
11178         return 0;
11179 }
11180
11181 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
11182                           unsigned int len)
11183 {
11184         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
11185 }
11186
11187 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
11188         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
11189         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
11190 };
11191
11192 /**
11193  *      nft_data_init - parse nf_tables data netlink attributes
11194  *
11195  *      @ctx: context of the expression using the data
11196  *      @data: destination struct nft_data
11197  *      @desc: data description
11198  *      @nla: netlink attribute containing data
11199  *
11200  *      Parse the netlink data attributes and initialize a struct nft_data.
11201  *      The type and length of data are returned in the data description.
11202  *
11203  *      The caller can indicate that it only wants to accept data of type
11204  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
11205  */
11206 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
11207                   struct nft_data_desc *desc, const struct nlattr *nla)
11208 {
11209         struct nlattr *tb[NFTA_DATA_MAX + 1];
11210         int err;
11211
11212         if (WARN_ON_ONCE(!desc->size))
11213                 return -EINVAL;
11214
11215         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
11216                                           nft_data_policy, NULL);
11217         if (err < 0)
11218                 return err;
11219
11220         if (tb[NFTA_DATA_VALUE]) {
11221                 if (desc->type != NFT_DATA_VALUE)
11222                         return -EINVAL;
11223
11224                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
11225         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
11226                 if (desc->type != NFT_DATA_VERDICT)
11227                         return -EINVAL;
11228
11229                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
11230         } else {
11231                 err = -EINVAL;
11232         }
11233
11234         return err;
11235 }
11236 EXPORT_SYMBOL_GPL(nft_data_init);
11237
11238 /**
11239  *      nft_data_release - release a nft_data item
11240  *
11241  *      @data: struct nft_data to release
11242  *      @type: type of data
11243  *
11244  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
11245  *      all others need to be released by calling this function.
11246  */
11247 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
11248 {
11249         if (type < NFT_DATA_VERDICT)
11250                 return;
11251         switch (type) {
11252         case NFT_DATA_VERDICT:
11253                 return nft_verdict_uninit(data);
11254         default:
11255                 WARN_ON(1);
11256         }
11257 }
11258 EXPORT_SYMBOL_GPL(nft_data_release);
11259
11260 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
11261                   enum nft_data_types type, unsigned int len)
11262 {
11263         struct nlattr *nest;
11264         int err;
11265
11266         nest = nla_nest_start_noflag(skb, attr);
11267         if (nest == NULL)
11268                 return -1;
11269
11270         switch (type) {
11271         case NFT_DATA_VALUE:
11272                 err = nft_value_dump(skb, data, len);
11273                 break;
11274         case NFT_DATA_VERDICT:
11275                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
11276                 break;
11277         default:
11278                 err = -EINVAL;
11279                 WARN_ON(1);
11280         }
11281
11282         nla_nest_end(skb, nest);
11283         return err;
11284 }
11285 EXPORT_SYMBOL_GPL(nft_data_dump);
11286
11287 int __nft_release_basechain(struct nft_ctx *ctx)
11288 {
11289         struct nft_rule *rule, *nr;
11290
11291         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
11292                 return 0;
11293
11294         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
11295         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
11296                 list_del(&rule->list);
11297                 nft_use_dec(&ctx->chain->use);
11298                 nf_tables_rule_release(ctx, rule);
11299         }
11300         nft_chain_del(ctx->chain);
11301         nft_use_dec(&ctx->table->use);
11302         nf_tables_chain_destroy(ctx);
11303
11304         return 0;
11305 }
11306 EXPORT_SYMBOL_GPL(__nft_release_basechain);
11307
11308 static void __nft_release_hook(struct net *net, struct nft_table *table)
11309 {
11310         struct nft_flowtable *flowtable;
11311         struct nft_chain *chain;
11312
11313         list_for_each_entry(chain, &table->chains, list)
11314                 __nf_tables_unregister_hook(net, table, chain, true);
11315         list_for_each_entry(flowtable, &table->flowtables, list)
11316                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
11317                                                      true);
11318 }
11319
11320 static void __nft_release_hooks(struct net *net)
11321 {
11322         struct nftables_pernet *nft_net = nft_pernet(net);
11323         struct nft_table *table;
11324
11325         list_for_each_entry(table, &nft_net->tables, list) {
11326                 if (nft_table_has_owner(table))
11327                         continue;
11328
11329                 __nft_release_hook(net, table);
11330         }
11331 }
11332
11333 static void __nft_release_table(struct net *net, struct nft_table *table)
11334 {
11335         struct nft_flowtable *flowtable, *nf;
11336         struct nft_chain *chain, *nc;
11337         struct nft_object *obj, *ne;
11338         struct nft_rule *rule, *nr;
11339         struct nft_set *set, *ns;
11340         struct nft_ctx ctx = {
11341                 .net    = net,
11342                 .family = NFPROTO_NETDEV,
11343         };
11344
11345         ctx.family = table->family;
11346         ctx.table = table;
11347         list_for_each_entry(chain, &table->chains, list) {
11348                 if (nft_chain_binding(chain))
11349                         continue;
11350
11351                 ctx.chain = chain;
11352                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
11353                         list_del(&rule->list);
11354                         nft_use_dec(&chain->use);
11355                         nf_tables_rule_release(&ctx, rule);
11356                 }
11357         }
11358         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
11359                 list_del(&flowtable->list);
11360                 nft_use_dec(&table->use);
11361                 nf_tables_flowtable_destroy(flowtable);
11362         }
11363         list_for_each_entry_safe(set, ns, &table->sets, list) {
11364                 list_del(&set->list);
11365                 nft_use_dec(&table->use);
11366                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
11367                         nft_map_deactivate(&ctx, set);
11368
11369                 nft_set_destroy(&ctx, set);
11370         }
11371         list_for_each_entry_safe(obj, ne, &table->objects, list) {
11372                 nft_obj_del(obj);
11373                 nft_use_dec(&table->use);
11374                 nft_obj_destroy(&ctx, obj);
11375         }
11376         list_for_each_entry_safe(chain, nc, &table->chains, list) {
11377                 ctx.chain = chain;
11378                 nft_chain_del(chain);
11379                 nft_use_dec(&table->use);
11380                 nf_tables_chain_destroy(&ctx);
11381         }
11382         nf_tables_table_destroy(&ctx);
11383 }
11384
11385 static void __nft_release_tables(struct net *net)
11386 {
11387         struct nftables_pernet *nft_net = nft_pernet(net);
11388         struct nft_table *table, *nt;
11389
11390         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
11391                 if (nft_table_has_owner(table))
11392                         continue;
11393
11394                 list_del(&table->list);
11395
11396                 __nft_release_table(net, table);
11397         }
11398 }
11399
11400 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
11401                             void *ptr)
11402 {
11403         struct nft_table *table, *to_delete[8];
11404         struct nftables_pernet *nft_net;
11405         struct netlink_notify *n = ptr;
11406         struct net *net = n->net;
11407         unsigned int deleted;
11408         bool restart = false;
11409         unsigned int gc_seq;
11410
11411         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
11412                 return NOTIFY_DONE;
11413
11414         nft_net = nft_pernet(net);
11415         deleted = 0;
11416         mutex_lock(&nft_net->commit_mutex);
11417
11418         gc_seq = nft_gc_seq_begin(nft_net);
11419
11420         if (!list_empty(&nf_tables_destroy_list))
11421                 nf_tables_trans_destroy_flush_work();
11422 again:
11423         list_for_each_entry(table, &nft_net->tables, list) {
11424                 if (nft_table_has_owner(table) &&
11425                     n->portid == table->nlpid) {
11426                         if (table->flags & NFT_TABLE_F_PERSIST) {
11427                                 table->flags &= ~NFT_TABLE_F_OWNER;
11428                                 continue;
11429                         }
11430                         __nft_release_hook(net, table);
11431                         list_del_rcu(&table->list);
11432                         to_delete[deleted++] = table;
11433                         if (deleted >= ARRAY_SIZE(to_delete))
11434                                 break;
11435                 }
11436         }
11437         if (deleted) {
11438                 restart = deleted >= ARRAY_SIZE(to_delete);
11439                 synchronize_rcu();
11440                 while (deleted)
11441                         __nft_release_table(net, to_delete[--deleted]);
11442
11443                 if (restart)
11444                         goto again;
11445         }
11446         nft_gc_seq_end(nft_net, gc_seq);
11447
11448         mutex_unlock(&nft_net->commit_mutex);
11449
11450         return NOTIFY_DONE;
11451 }
11452
11453 static struct notifier_block nft_nl_notifier = {
11454         .notifier_call  = nft_rcv_nl_event,
11455 };
11456
11457 static int __net_init nf_tables_init_net(struct net *net)
11458 {
11459         struct nftables_pernet *nft_net = nft_pernet(net);
11460
11461         INIT_LIST_HEAD(&nft_net->tables);
11462         INIT_LIST_HEAD(&nft_net->commit_list);
11463         INIT_LIST_HEAD(&nft_net->binding_list);
11464         INIT_LIST_HEAD(&nft_net->module_list);
11465         INIT_LIST_HEAD(&nft_net->notify_list);
11466         mutex_init(&nft_net->commit_mutex);
11467         nft_net->base_seq = 1;
11468         nft_net->gc_seq = 0;
11469         nft_net->validate_state = NFT_VALIDATE_SKIP;
11470
11471         return 0;
11472 }
11473
11474 static void __net_exit nf_tables_pre_exit_net(struct net *net)
11475 {
11476         struct nftables_pernet *nft_net = nft_pernet(net);
11477
11478         mutex_lock(&nft_net->commit_mutex);
11479         __nft_release_hooks(net);
11480         mutex_unlock(&nft_net->commit_mutex);
11481 }
11482
11483 static void __net_exit nf_tables_exit_net(struct net *net)
11484 {
11485         struct nftables_pernet *nft_net = nft_pernet(net);
11486         unsigned int gc_seq;
11487
11488         mutex_lock(&nft_net->commit_mutex);
11489
11490         gc_seq = nft_gc_seq_begin(nft_net);
11491
11492         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
11493
11494         if (!list_empty(&nft_net->module_list))
11495                 nf_tables_module_autoload_cleanup(net);
11496
11497         __nft_release_tables(net);
11498
11499         nft_gc_seq_end(nft_net, gc_seq);
11500
11501         mutex_unlock(&nft_net->commit_mutex);
11502         WARN_ON_ONCE(!list_empty(&nft_net->tables));
11503         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
11504         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
11505 }
11506
11507 static void nf_tables_exit_batch(struct list_head *net_exit_list)
11508 {
11509         flush_work(&trans_gc_work);
11510 }
11511
11512 static struct pernet_operations nf_tables_net_ops = {
11513         .init           = nf_tables_init_net,
11514         .pre_exit       = nf_tables_pre_exit_net,
11515         .exit           = nf_tables_exit_net,
11516         .exit_batch     = nf_tables_exit_batch,
11517         .id             = &nf_tables_net_id,
11518         .size           = sizeof(struct nftables_pernet),
11519 };
11520
11521 static int __init nf_tables_module_init(void)
11522 {
11523         int err;
11524
11525         err = register_pernet_subsys(&nf_tables_net_ops);
11526         if (err < 0)
11527                 return err;
11528
11529         err = nft_chain_filter_init();
11530         if (err < 0)
11531                 goto err_chain_filter;
11532
11533         err = nf_tables_core_module_init();
11534         if (err < 0)
11535                 goto err_core_module;
11536
11537         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
11538         if (err < 0)
11539                 goto err_netdev_notifier;
11540
11541         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
11542         if (err < 0)
11543                 goto err_rht_objname;
11544
11545         err = nft_offload_init();
11546         if (err < 0)
11547                 goto err_offload;
11548
11549         err = netlink_register_notifier(&nft_nl_notifier);
11550         if (err < 0)
11551                 goto err_netlink_notifier;
11552
11553         /* must be last */
11554         err = nfnetlink_subsys_register(&nf_tables_subsys);
11555         if (err < 0)
11556                 goto err_nfnl_subsys;
11557
11558         nft_chain_route_init();
11559
11560         return err;
11561
11562 err_nfnl_subsys:
11563         netlink_unregister_notifier(&nft_nl_notifier);
11564 err_netlink_notifier:
11565         nft_offload_exit();
11566 err_offload:
11567         rhltable_destroy(&nft_objname_ht);
11568 err_rht_objname:
11569         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11570 err_netdev_notifier:
11571         nf_tables_core_module_exit();
11572 err_core_module:
11573         nft_chain_filter_fini();
11574 err_chain_filter:
11575         unregister_pernet_subsys(&nf_tables_net_ops);
11576         return err;
11577 }
11578
11579 static void __exit nf_tables_module_exit(void)
11580 {
11581         nfnetlink_subsys_unregister(&nf_tables_subsys);
11582         netlink_unregister_notifier(&nft_nl_notifier);
11583         nft_offload_exit();
11584         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11585         nft_chain_filter_fini();
11586         nft_chain_route_fini();
11587         nf_tables_trans_destroy_flush_work();
11588         unregister_pernet_subsys(&nf_tables_net_ops);
11589         cancel_work_sync(&trans_gc_work);
11590         cancel_work_sync(&trans_destroy_work);
11591         rcu_barrier();
11592         rhltable_destroy(&nft_objname_ht);
11593         nf_tables_core_module_exit();
11594 }
11595
11596 module_init(nf_tables_module_init);
11597 module_exit(nf_tables_module_exit);
11598
11599 MODULE_LICENSE("GPL");
11600 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11601 MODULE_DESCRIPTION("Framework for packet filtering and classification");
11602 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);