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
  28 unsigned int nf_tables_net_id __read_mostly;
  29
  30 static LIST_HEAD(nf_tables_expressions);
  31 static LIST_HEAD(nf_tables_objects);
  32 static LIST_HEAD(nf_tables_flowtables);
  33 static LIST_HEAD(nf_tables_destroy_list);
  34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  35
  36 enum {
  37         NFT_VALIDATE_SKIP       = 0,
  38         NFT_VALIDATE_NEED,
  39         NFT_VALIDATE_DO,
  40 };
  41
  42 static struct rhltable nft_objname_ht;
  43
  44 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  45 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  46 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  47
  48 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  49 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  50 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  51
  52 static const struct rhashtable_params nft_chain_ht_params = {
  53         .head_offset            = offsetof(struct nft_chain, rhlhead),
  54         .key_offset             = offsetof(struct nft_chain, name),
  55         .hashfn                 = nft_chain_hash,
  56         .obj_hashfn             = nft_chain_hash_obj,
  57         .obj_cmpfn              = nft_chain_hash_cmp,
  58         .automatic_shrinking    = true,
  59 };
  60
  61 static const struct rhashtable_params nft_objname_ht_params = {
  62         .head_offset            = offsetof(struct nft_object, rhlhead),
  63         .key_offset             = offsetof(struct nft_object, key),
  64         .hashfn                 = nft_objname_hash,
  65         .obj_hashfn             = nft_objname_hash_obj,
  66         .obj_cmpfn              = nft_objname_hash_cmp,
  67         .automatic_shrinking    = true,
  68 };
  69
  70 struct nft_audit_data {
  71         struct nft_table *table;
  72         int entries;
  73         int op;
  74         struct list_head list;
  75 };
  76
  77 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  78         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  79         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  80         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  81         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  82         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  83         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  84         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  85         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  86         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  87         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  88         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  89         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  90         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  91         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  92         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  93         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  94         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  95         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  96         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
  97         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
  98         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
  99         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 100         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 101         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 102         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 103 };
 104
 105 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
 106 {
 107         switch (table->validate_state) {
 108         case NFT_VALIDATE_SKIP:
 109                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 110                 break;
 111         case NFT_VALIDATE_NEED:
 112                 break;
 113         case NFT_VALIDATE_DO:
 114                 if (new_validate_state == NFT_VALIDATE_NEED)
 115                         return;
 116         }
 117
 118         table->validate_state = new_validate_state;
 119 }
 120 static void nf_tables_trans_destroy_work(struct work_struct *w);
 121 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 122
 123 static void nft_ctx_init(struct nft_ctx *ctx,
 124                          struct net *net,
 125                          const struct sk_buff *skb,
 126                          const struct nlmsghdr *nlh,
 127                          u8 family,
 128                          struct nft_table *table,
 129                          struct nft_chain *chain,
 130                          const struct nlattr * const *nla)
 131 {
 132         ctx->net        = net;
 133         ctx->family     = family;
 134         ctx->level      = 0;
 135         ctx->table      = table;
 136         ctx->chain      = chain;
 137         ctx->nla        = nla;
 138         ctx->portid     = NETLINK_CB(skb).portid;
 139         ctx->report     = nlmsg_report(nlh);
 140         ctx->flags      = nlh->nlmsg_flags;
 141         ctx->seq        = nlh->nlmsg_seq;
 142 }
 143
 144 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 145                                              int msg_type, u32 size, gfp_t gfp)
 146 {
 147         struct nft_trans *trans;
 148
 149         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 150         if (trans == NULL)
 151                 return NULL;
 152
 153         INIT_LIST_HEAD(&trans->list);
 154         trans->msg_type = msg_type;
 155         trans->ctx      = *ctx;
 156
 157         return trans;
 158 }
 159
 160 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 161                                          int msg_type, u32 size)
 162 {
 163         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 164 }
 165
 166 static void nft_trans_destroy(struct nft_trans *trans)
 167 {
 168         list_del(&trans->list);
 169         kfree(trans);
 170 }
 171
 172 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 173 {
 174         struct nftables_pernet *nft_net;
 175         struct net *net = ctx->net;
 176         struct nft_trans *trans;
 177
 178         if (!nft_set_is_anonymous(set))
 179                 return;
 180
 181         nft_net = nft_pernet(net);
 182         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 183                 switch (trans->msg_type) {
 184                 case NFT_MSG_NEWSET:
 185                         if (nft_trans_set(trans) == set)
 186                                 nft_trans_set_bound(trans) = true;
 187                         break;
 188                 case NFT_MSG_NEWSETELEM:
 189                         if (nft_trans_elem_set(trans) == set)
 190                                 nft_trans_elem_set_bound(trans) = true;
 191                         break;
 192                 }
 193         }
 194 }
 195
 196 static int nft_netdev_register_hooks(struct net *net,
 197                                      struct list_head *hook_list)
 198 {
 199         struct nft_hook *hook;
 200         int err, j;
 201
 202         j = 0;
 203         list_for_each_entry(hook, hook_list, list) {
 204                 err = nf_register_net_hook(net, &hook->ops);
 205                 if (err < 0)
 206                         goto err_register;
 207
 208                 j++;
 209         }
 210         return 0;
 211
 212 err_register:
 213         list_for_each_entry(hook, hook_list, list) {
 214                 if (j-- <= 0)
 215                         break;
 216
 217                 nf_unregister_net_hook(net, &hook->ops);
 218         }
 219         return err;
 220 }
 221
 222 static void nft_netdev_unregister_hooks(struct net *net,
 223                                         struct list_head *hook_list,
 224                                         bool release_netdev)
 225 {
 226         struct nft_hook *hook, *next;
 227
 228         list_for_each_entry_safe(hook, next, hook_list, list) {
 229                 nf_unregister_net_hook(net, &hook->ops);
 230                 if (release_netdev) {
 231                         list_del(&hook->list);
 232                         kfree_rcu(hook, rcu);
 233                 }
 234         }
 235 }
 236
 237 static int nf_tables_register_hook(struct net *net,
 238                                    const struct nft_table *table,
 239                                    struct nft_chain *chain)
 240 {
 241         struct nft_base_chain *basechain;
 242         const struct nf_hook_ops *ops;
 243
 244         if (table->flags & NFT_TABLE_F_DORMANT ||
 245             !nft_is_base_chain(chain))
 246                 return 0;
 247
 248         basechain = nft_base_chain(chain);
 249         ops = &basechain->ops;
 250
 251         if (basechain->type->ops_register)
 252                 return basechain->type->ops_register(net, ops);
 253
 254         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 255                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 256
 257         return nf_register_net_hook(net, &basechain->ops);
 258 }
 259
 260 static void __nf_tables_unregister_hook(struct net *net,
 261                                         const struct nft_table *table,
 262                                         struct nft_chain *chain,
 263                                         bool release_netdev)
 264 {
 265         struct nft_base_chain *basechain;
 266         const struct nf_hook_ops *ops;
 267
 268         if (table->flags & NFT_TABLE_F_DORMANT ||
 269             !nft_is_base_chain(chain))
 270                 return;
 271         basechain = nft_base_chain(chain);
 272         ops = &basechain->ops;
 273
 274         if (basechain->type->ops_unregister)
 275                 return basechain->type->ops_unregister(net, ops);
 276
 277         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 278                 nft_netdev_unregister_hooks(net, &basechain->hook_list,
 279                                             release_netdev);
 280         else
 281                 nf_unregister_net_hook(net, &basechain->ops);
 282 }
 283
 284 static void nf_tables_unregister_hook(struct net *net,
 285                                       const struct nft_table *table,
 286                                       struct nft_chain *chain)
 287 {
 288         return __nf_tables_unregister_hook(net, table, chain, false);
 289 }
 290
 291 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 292 {
 293         struct nftables_pernet *nft_net = nft_pernet(net);
 294
 295         list_add_tail(&trans->list, &nft_net->commit_list);
 296 }
 297
 298 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 299 {
 300         struct nft_trans *trans;
 301
 302         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 303         if (trans == NULL)
 304                 return -ENOMEM;
 305
 306         if (msg_type == NFT_MSG_NEWTABLE)
 307                 nft_activate_next(ctx->net, ctx->table);
 308
 309         nft_trans_commit_list_add_tail(ctx->net, trans);
 310         return 0;
 311 }
 312
 313 static int nft_deltable(struct nft_ctx *ctx)
 314 {
 315         int err;
 316
 317         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 318         if (err < 0)
 319                 return err;
 320
 321         nft_deactivate_next(ctx->net, ctx->table);
 322         return err;
 323 }
 324
 325 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 326 {
 327         struct nft_trans *trans;
 328
 329         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 330         if (trans == NULL)
 331                 return ERR_PTR(-ENOMEM);
 332
 333         if (msg_type == NFT_MSG_NEWCHAIN) {
 334                 nft_activate_next(ctx->net, ctx->chain);
 335
 336                 if (ctx->nla[NFTA_CHAIN_ID]) {
 337                         nft_trans_chain_id(trans) =
 338                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 339                 }
 340         }
 341
 342         nft_trans_commit_list_add_tail(ctx->net, trans);
 343         return trans;
 344 }
 345
 346 static int nft_delchain(struct nft_ctx *ctx)
 347 {
 348         struct nft_trans *trans;
 349
 350         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 351         if (IS_ERR(trans))
 352                 return PTR_ERR(trans);
 353
 354         ctx->table->use--;
 355         nft_deactivate_next(ctx->net, ctx->chain);
 356
 357         return 0;
 358 }
 359
 360 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
 361                                    struct nft_rule *rule)
 362 {
 363         struct nft_expr *expr;
 364
 365         expr = nft_expr_first(rule);
 366         while (nft_expr_more(rule, expr)) {
 367                 if (expr->ops->activate)
 368                         expr->ops->activate(ctx, expr);
 369
 370                 expr = nft_expr_next(expr);
 371         }
 372 }
 373
 374 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
 375                                      struct nft_rule *rule,
 376                                      enum nft_trans_phase phase)
 377 {
 378         struct nft_expr *expr;
 379
 380         expr = nft_expr_first(rule);
 381         while (nft_expr_more(rule, expr)) {
 382                 if (expr->ops->deactivate)
 383                         expr->ops->deactivate(ctx, expr, phase);
 384
 385                 expr = nft_expr_next(expr);
 386         }
 387 }
 388
 389 static int
 390 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 391 {
 392         /* You cannot delete the same rule twice */
 393         if (nft_is_active_next(ctx->net, rule)) {
 394                 nft_deactivate_next(ctx->net, rule);
 395                 ctx->chain->use--;
 396                 return 0;
 397         }
 398         return -ENOENT;
 399 }
 400
 401 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 402                                             struct nft_rule *rule)
 403 {
 404         struct nft_trans *trans;
 405
 406         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 407         if (trans == NULL)
 408                 return NULL;
 409
 410         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 411                 nft_trans_rule_id(trans) =
 412                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 413         }
 414         nft_trans_rule(trans) = rule;
 415         nft_trans_commit_list_add_tail(ctx->net, trans);
 416
 417         return trans;
 418 }
 419
 420 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 421 {
 422         struct nft_flow_rule *flow;
 423         struct nft_trans *trans;
 424         int err;
 425
 426         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 427         if (trans == NULL)
 428                 return -ENOMEM;
 429
 430         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 431                 flow = nft_flow_rule_create(ctx->net, rule);
 432                 if (IS_ERR(flow)) {
 433                         nft_trans_destroy(trans);
 434                         return PTR_ERR(flow);
 435                 }
 436
 437                 nft_trans_flow_rule(trans) = flow;
 438         }
 439
 440         err = nf_tables_delrule_deactivate(ctx, rule);
 441         if (err < 0) {
 442                 nft_trans_destroy(trans);
 443                 return err;
 444         }
 445         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 446
 447         return 0;
 448 }
 449
 450 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 451 {
 452         struct nft_rule *rule;
 453         int err;
 454
 455         list_for_each_entry(rule, &ctx->chain->rules, list) {
 456                 if (!nft_is_active_next(ctx->net, rule))
 457                         continue;
 458
 459                 err = nft_delrule(ctx, rule);
 460                 if (err < 0)
 461                         return err;
 462         }
 463         return 0;
 464 }
 465
 466 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 467                                struct nft_set *set,
 468                                const struct nft_set_desc *desc)
 469 {
 470         struct nft_trans *trans;
 471
 472         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 473         if (trans == NULL)
 474                 return -ENOMEM;
 475
 476         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
 477                 nft_trans_set_id(trans) =
 478                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 479                 nft_activate_next(ctx->net, set);
 480         }
 481         nft_trans_set(trans) = set;
 482         if (desc) {
 483                 nft_trans_set_update(trans) = true;
 484                 nft_trans_set_gc_int(trans) = desc->gc_int;
 485                 nft_trans_set_timeout(trans) = desc->timeout;
 486         }
 487         nft_trans_commit_list_add_tail(ctx->net, trans);
 488
 489         return 0;
 490 }
 491
 492 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 493                              struct nft_set *set)
 494 {
 495         return __nft_trans_set_add(ctx, msg_type, set, NULL);
 496 }
 497
 498 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 499 {
 500         int err;
 501
 502         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 503         if (err < 0)
 504                 return err;
 505
 506         nft_deactivate_next(ctx->net, set);
 507         ctx->table->use--;
 508
 509         return err;
 510 }
 511
 512 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 513                              struct nft_object *obj)
 514 {
 515         struct nft_trans *trans;
 516
 517         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 518         if (trans == NULL)
 519                 return -ENOMEM;
 520
 521         if (msg_type == NFT_MSG_NEWOBJ)
 522                 nft_activate_next(ctx->net, obj);
 523
 524         nft_trans_obj(trans) = obj;
 525         nft_trans_commit_list_add_tail(ctx->net, trans);
 526
 527         return 0;
 528 }
 529
 530 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 531 {
 532         int err;
 533
 534         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 535         if (err < 0)
 536                 return err;
 537
 538         nft_deactivate_next(ctx->net, obj);
 539         ctx->table->use--;
 540
 541         return err;
 542 }
 543
 544 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 545                                    struct nft_flowtable *flowtable)
 546 {
 547         struct nft_trans *trans;
 548
 549         trans = nft_trans_alloc(ctx, msg_type,
 550                                 sizeof(struct nft_trans_flowtable));
 551         if (trans == NULL)
 552                 return -ENOMEM;
 553
 554         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 555                 nft_activate_next(ctx->net, flowtable);
 556
 557         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
 558         nft_trans_flowtable(trans) = flowtable;
 559         nft_trans_commit_list_add_tail(ctx->net, trans);
 560
 561         return 0;
 562 }
 563
 564 static int nft_delflowtable(struct nft_ctx *ctx,
 565                             struct nft_flowtable *flowtable)
 566 {
 567         int err;
 568
 569         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 570         if (err < 0)
 571                 return err;
 572
 573         nft_deactivate_next(ctx->net, flowtable);
 574         ctx->table->use--;
 575
 576         return err;
 577 }
 578
 579 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
 580 {
 581         int i;
 582
 583         for (i = track->regs[dreg].num_reg; i > 0; i--)
 584                 __nft_reg_track_cancel(track, dreg - i);
 585 }
 586
 587 static void __nft_reg_track_update(struct nft_regs_track *track,
 588                                    const struct nft_expr *expr,
 589                                    u8 dreg, u8 num_reg)
 590 {
 591         track->regs[dreg].selector = expr;
 592         track->regs[dreg].bitwise = NULL;
 593         track->regs[dreg].num_reg = num_reg;
 594 }
 595
 596 void nft_reg_track_update(struct nft_regs_track *track,
 597                           const struct nft_expr *expr, u8 dreg, u8 len)
 598 {
 599         unsigned int regcount;
 600         int i;
 601
 602         __nft_reg_track_clobber(track, dreg);
 603
 604         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 605         for (i = 0; i < regcount; i++, dreg++)
 606                 __nft_reg_track_update(track, expr, dreg, i);
 607 }
 608 EXPORT_SYMBOL_GPL(nft_reg_track_update);
 609
 610 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
 611 {
 612         unsigned int regcount;
 613         int i;
 614
 615         __nft_reg_track_clobber(track, dreg);
 616
 617         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 618         for (i = 0; i < regcount; i++, dreg++)
 619                 __nft_reg_track_cancel(track, dreg);
 620 }
 621 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
 622
 623 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
 624 {
 625         track->regs[dreg].selector = NULL;
 626         track->regs[dreg].bitwise = NULL;
 627         track->regs[dreg].num_reg = 0;
 628 }
 629 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
 630
 631 /*
 632  * Tables
 633  */
 634
 635 static struct nft_table *nft_table_lookup(const struct net *net,
 636                                           const struct nlattr *nla,
 637                                           u8 family, u8 genmask, u32 nlpid)
 638 {
 639         struct nftables_pernet *nft_net;
 640         struct nft_table *table;
 641
 642         if (nla == NULL)
 643                 return ERR_PTR(-EINVAL);
 644
 645         nft_net = nft_pernet(net);
 646         list_for_each_entry_rcu(table, &nft_net->tables, list,
 647                                 lockdep_is_held(&nft_net->commit_mutex)) {
 648                 if (!nla_strcmp(nla, table->name) &&
 649                     table->family == family &&
 650                     nft_active_genmask(table, genmask)) {
 651                         if (nft_table_has_owner(table) &&
 652                             nlpid && table->nlpid != nlpid)
 653                                 return ERR_PTR(-EPERM);
 654
 655                         return table;
 656                 }
 657         }
 658
 659         return ERR_PTR(-ENOENT);
 660 }
 661
 662 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 663                                                    const struct nlattr *nla,
 664                                                    u8 genmask, u32 nlpid)
 665 {
 666         struct nftables_pernet *nft_net;
 667         struct nft_table *table;
 668
 669         nft_net = nft_pernet(net);
 670         list_for_each_entry(table, &nft_net->tables, list) {
 671                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 672                     nft_active_genmask(table, genmask)) {
 673                         if (nft_table_has_owner(table) &&
 674                             nlpid && table->nlpid != nlpid)
 675                                 return ERR_PTR(-EPERM);
 676
 677                         return table;
 678                 }
 679         }
 680
 681         return ERR_PTR(-ENOENT);
 682 }
 683
 684 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 685 {
 686         return ++table->hgenerator;
 687 }
 688
 689 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 690
 691 static const struct nft_chain_type *
 692 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 693 {
 694         if (family >= NFPROTO_NUMPROTO ||
 695             type >= NFT_CHAIN_T_MAX)
 696                 return NULL;
 697
 698         return chain_type[family][type];
 699 }
 700
 701 static const struct nft_chain_type *
 702 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 703 {
 704         const struct nft_chain_type *type;
 705         int i;
 706
 707         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 708                 type = __nft_chain_type_get(family, i);
 709                 if (!type)
 710                         continue;
 711                 if (!nla_strcmp(nla, type->name))
 712                         return type;
 713         }
 714         return NULL;
 715 }
 716
 717 struct nft_module_request {
 718         struct list_head        list;
 719         char                    module[MODULE_NAME_LEN];
 720         bool                    done;
 721 };
 722
 723 #ifdef CONFIG_MODULES
 724 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 725                                       ...)
 726 {
 727         char module_name[MODULE_NAME_LEN];
 728         struct nftables_pernet *nft_net;
 729         struct nft_module_request *req;
 730         va_list args;
 731         int ret;
 732
 733         va_start(args, fmt);
 734         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 735         va_end(args);
 736         if (ret >= MODULE_NAME_LEN)
 737                 return 0;
 738
 739         nft_net = nft_pernet(net);
 740         list_for_each_entry(req, &nft_net->module_list, list) {
 741                 if (!strcmp(req->module, module_name)) {
 742                         if (req->done)
 743                                 return 0;
 744
 745                         /* A request to load this module already exists. */
 746                         return -EAGAIN;
 747                 }
 748         }
 749
 750         req = kmalloc(sizeof(*req), GFP_KERNEL);
 751         if (!req)
 752                 return -ENOMEM;
 753
 754         req->done = false;
 755         strscpy(req->module, module_name, MODULE_NAME_LEN);
 756         list_add_tail(&req->list, &nft_net->module_list);
 757
 758         return -EAGAIN;
 759 }
 760 EXPORT_SYMBOL_GPL(nft_request_module);
 761 #endif
 762
 763 static void lockdep_nfnl_nft_mutex_not_held(void)
 764 {
 765 #ifdef CONFIG_PROVE_LOCKING
 766         if (debug_locks)
 767                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 768 #endif
 769 }
 770
 771 static const struct nft_chain_type *
 772 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 773                             u8 family, bool autoload)
 774 {
 775         const struct nft_chain_type *type;
 776
 777         type = __nf_tables_chain_type_lookup(nla, family);
 778         if (type != NULL)
 779                 return type;
 780
 781         lockdep_nfnl_nft_mutex_not_held();
 782 #ifdef CONFIG_MODULES
 783         if (autoload) {
 784                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 785                                        nla_len(nla),
 786                                        (const char *)nla_data(nla)) == -EAGAIN)
 787                         return ERR_PTR(-EAGAIN);
 788         }
 789 #endif
 790         return ERR_PTR(-ENOENT);
 791 }
 792
 793 static __be16 nft_base_seq(const struct net *net)
 794 {
 795         struct nftables_pernet *nft_net = nft_pernet(net);
 796
 797         return htons(nft_net->base_seq & 0xffff);
 798 }
 799
 800 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 801         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 802                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 803         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 804         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 805         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 806                                     .len = NFT_USERDATA_MAXLEN }
 807 };
 808
 809 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 810                                      u32 portid, u32 seq, int event, u32 flags,
 811                                      int family, const struct nft_table *table)
 812 {
 813         struct nlmsghdr *nlh;
 814
 815         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 816         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 817                            NFNETLINK_V0, nft_base_seq(net));
 818         if (!nlh)
 819                 goto nla_put_failure;
 820
 821         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 822             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 823             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 824                          NFTA_TABLE_PAD))
 825                 goto nla_put_failure;
 826
 827         if (event == NFT_MSG_DELTABLE) {
 828                 nlmsg_end(skb, nlh);
 829                 return 0;
 830         }
 831
 832         if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
 833                          htonl(table->flags & NFT_TABLE_F_MASK)))
 834                 goto nla_put_failure;
 835
 836         if (nft_table_has_owner(table) &&
 837             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 838                 goto nla_put_failure;
 839
 840         if (table->udata) {
 841                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 842                         goto nla_put_failure;
 843         }
 844
 845         nlmsg_end(skb, nlh);
 846         return 0;
 847
 848 nla_put_failure:
 849         nlmsg_trim(skb, nlh);
 850         return -1;
 851 }
 852
 853 struct nftnl_skb_parms {
 854         bool report;
 855 };
 856 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 857
 858 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 859                                struct list_head *notify_list)
 860 {
 861         NFT_CB(skb).report = report;
 862         list_add_tail(&skb->list, notify_list);
 863 }
 864
 865 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 866 {
 867         struct nftables_pernet *nft_net;
 868         struct sk_buff *skb;
 869         u16 flags = 0;
 870         int err;
 871
 872         if (!ctx->report &&
 873             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 874                 return;
 875
 876         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 877         if (skb == NULL)
 878                 goto err;
 879
 880         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
 881                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
 882
 883         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 884                                         event, flags, ctx->family, ctx->table);
 885         if (err < 0) {
 886                 kfree_skb(skb);
 887                 goto err;
 888         }
 889
 890         nft_net = nft_pernet(ctx->net);
 891         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
 892         return;
 893 err:
 894         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 895 }
 896
 897 static int nf_tables_dump_tables(struct sk_buff *skb,
 898                                  struct netlink_callback *cb)
 899 {
 900         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 901         struct nftables_pernet *nft_net;
 902         const struct nft_table *table;
 903         unsigned int idx = 0, s_idx = cb->args[0];
 904         struct net *net = sock_net(skb->sk);
 905         int family = nfmsg->nfgen_family;
 906
 907         rcu_read_lock();
 908         nft_net = nft_pernet(net);
 909         cb->seq = READ_ONCE(nft_net->base_seq);
 910
 911         list_for_each_entry_rcu(table, &nft_net->tables, list) {
 912                 if (family != NFPROTO_UNSPEC && family != table->family)
 913                         continue;
 914
 915                 if (idx < s_idx)
 916                         goto cont;
 917                 if (idx > s_idx)
 918                         memset(&cb->args[1], 0,
 919                                sizeof(cb->args) - sizeof(cb->args[0]));
 920                 if (!nft_is_active(net, table))
 921                         continue;
 922                 if (nf_tables_fill_table_info(skb, net,
 923                                               NETLINK_CB(cb->skb).portid,
 924                                               cb->nlh->nlmsg_seq,
 925                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 926                                               table->family, table) < 0)
 927                         goto done;
 928
 929                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 930 cont:
 931                 idx++;
 932         }
 933 done:
 934         rcu_read_unlock();
 935         cb->args[0] = idx;
 936         return skb->len;
 937 }
 938
 939 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 940                                       const struct nlmsghdr *nlh,
 941                                       struct netlink_dump_control *c)
 942 {
 943         int err;
 944
 945         if (!try_module_get(THIS_MODULE))
 946                 return -EINVAL;
 947
 948         rcu_read_unlock();
 949         err = netlink_dump_start(nlsk, skb, nlh, c);
 950         rcu_read_lock();
 951         module_put(THIS_MODULE);
 952
 953         return err;
 954 }
 955
 956 /* called with rcu_read_lock held */
 957 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
 958                               const struct nlattr * const nla[])
 959 {
 960         struct netlink_ext_ack *extack = info->extack;
 961         u8 genmask = nft_genmask_cur(info->net);
 962         u8 family = info->nfmsg->nfgen_family;
 963         const struct nft_table *table;
 964         struct net *net = info->net;
 965         struct sk_buff *skb2;
 966         int err;
 967
 968         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
 969                 struct netlink_dump_control c = {
 970                         .dump = nf_tables_dump_tables,
 971                         .module = THIS_MODULE,
 972                 };
 973
 974                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
 975         }
 976
 977         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
 978         if (IS_ERR(table)) {
 979                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 980                 return PTR_ERR(table);
 981         }
 982
 983         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 984         if (!skb2)
 985                 return -ENOMEM;
 986
 987         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 988                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
 989                                         0, family, table);
 990         if (err < 0)
 991                 goto err_fill_table_info;
 992
 993         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 994
 995 err_fill_table_info:
 996         kfree_skb(skb2);
 997         return err;
 998 }
 999
1000 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1001 {
1002         struct nft_chain *chain;
1003         u32 i = 0;
1004
1005         list_for_each_entry(chain, &table->chains, list) {
1006                 if (!nft_is_active_next(net, chain))
1007                         continue;
1008                 if (!nft_is_base_chain(chain))
1009                         continue;
1010
1011                 if (cnt && i++ == cnt)
1012                         break;
1013
1014                 nf_tables_unregister_hook(net, table, chain);
1015         }
1016 }
1017
1018 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1019 {
1020         struct nft_chain *chain;
1021         int err, i = 0;
1022
1023         list_for_each_entry(chain, &table->chains, list) {
1024                 if (!nft_is_active_next(net, chain))
1025                         continue;
1026                 if (!nft_is_base_chain(chain))
1027                         continue;
1028
1029                 err = nf_tables_register_hook(net, table, chain);
1030                 if (err < 0)
1031                         goto err_register_hooks;
1032
1033                 i++;
1034         }
1035         return 0;
1036
1037 err_register_hooks:
1038         if (i)
1039                 nft_table_disable(net, table, i);
1040         return err;
1041 }
1042
1043 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1044 {
1045         table->flags &= ~NFT_TABLE_F_DORMANT;
1046         nft_table_disable(net, table, 0);
1047         table->flags |= NFT_TABLE_F_DORMANT;
1048 }
1049
1050 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
1051 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
1052 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
1053 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
1054                                          __NFT_TABLE_F_WAS_AWAKEN)
1055
1056 static int nf_tables_updtable(struct nft_ctx *ctx)
1057 {
1058         struct nft_trans *trans;
1059         u32 flags;
1060         int ret;
1061
1062         if (!ctx->nla[NFTA_TABLE_FLAGS])
1063                 return 0;
1064
1065         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1066         if (flags & ~NFT_TABLE_F_MASK)
1067                 return -EOPNOTSUPP;
1068
1069         if (flags == ctx->table->flags)
1070                 return 0;
1071
1072         if ((nft_table_has_owner(ctx->table) &&
1073              !(flags & NFT_TABLE_F_OWNER)) ||
1074             (!nft_table_has_owner(ctx->table) &&
1075              flags & NFT_TABLE_F_OWNER))
1076                 return -EOPNOTSUPP;
1077
1078         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1079                                 sizeof(struct nft_trans_table));
1080         if (trans == NULL)
1081                 return -ENOMEM;
1082
1083         if ((flags & NFT_TABLE_F_DORMANT) &&
1084             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1085                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1086                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1087                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1088         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1089                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1090                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1091                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1092                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1093                         if (ret < 0)
1094                                 goto err_register_hooks;
1095
1096                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1097                 }
1098         }
1099
1100         nft_trans_table_update(trans) = true;
1101         nft_trans_commit_list_add_tail(ctx->net, trans);
1102
1103         return 0;
1104
1105 err_register_hooks:
1106         nft_trans_destroy(trans);
1107         return ret;
1108 }
1109
1110 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1111 {
1112         const char *name = data;
1113
1114         return jhash(name, strlen(name), seed);
1115 }
1116
1117 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1118 {
1119         const struct nft_chain *chain = data;
1120
1121         return nft_chain_hash(chain->name, 0, seed);
1122 }
1123
1124 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1125                               const void *ptr)
1126 {
1127         const struct nft_chain *chain = ptr;
1128         const char *name = arg->key;
1129
1130         return strcmp(chain->name, name);
1131 }
1132
1133 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1134 {
1135         const struct nft_object_hash_key *k = data;
1136
1137         seed ^= hash_ptr(k->table, 32);
1138
1139         return jhash(k->name, strlen(k->name), seed);
1140 }
1141
1142 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1143 {
1144         const struct nft_object *obj = data;
1145
1146         return nft_objname_hash(&obj->key, 0, seed);
1147 }
1148
1149 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1150                                 const void *ptr)
1151 {
1152         const struct nft_object_hash_key *k = arg->key;
1153         const struct nft_object *obj = ptr;
1154
1155         if (obj->key.table != k->table)
1156                 return -1;
1157
1158         return strcmp(obj->key.name, k->name);
1159 }
1160
1161 static bool nft_supported_family(u8 family)
1162 {
1163         return false
1164 #ifdef CONFIG_NF_TABLES_INET
1165                 || family == NFPROTO_INET
1166 #endif
1167 #ifdef CONFIG_NF_TABLES_IPV4
1168                 || family == NFPROTO_IPV4
1169 #endif
1170 #ifdef CONFIG_NF_TABLES_ARP
1171                 || family == NFPROTO_ARP
1172 #endif
1173 #ifdef CONFIG_NF_TABLES_NETDEV
1174                 || family == NFPROTO_NETDEV
1175 #endif
1176 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1177                 || family == NFPROTO_BRIDGE
1178 #endif
1179 #ifdef CONFIG_NF_TABLES_IPV6
1180                 || family == NFPROTO_IPV6
1181 #endif
1182                 ;
1183 }
1184
1185 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1186                               const struct nlattr * const nla[])
1187 {
1188         struct nftables_pernet *nft_net = nft_pernet(info->net);
1189         struct netlink_ext_ack *extack = info->extack;
1190         u8 genmask = nft_genmask_next(info->net);
1191         u8 family = info->nfmsg->nfgen_family;
1192         struct net *net = info->net;
1193         const struct nlattr *attr;
1194         struct nft_table *table;
1195         struct nft_ctx ctx;
1196         u32 flags = 0;
1197         int err;
1198
1199         if (!nft_supported_family(family))
1200                 return -EOPNOTSUPP;
1201
1202         lockdep_assert_held(&nft_net->commit_mutex);
1203         attr = nla[NFTA_TABLE_NAME];
1204         table = nft_table_lookup(net, attr, family, genmask,
1205                                  NETLINK_CB(skb).portid);
1206         if (IS_ERR(table)) {
1207                 if (PTR_ERR(table) != -ENOENT)
1208                         return PTR_ERR(table);
1209         } else {
1210                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1211                         NL_SET_BAD_ATTR(extack, attr);
1212                         return -EEXIST;
1213                 }
1214                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1215                         return -EOPNOTSUPP;
1216
1217                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1218
1219                 return nf_tables_updtable(&ctx);
1220         }
1221
1222         if (nla[NFTA_TABLE_FLAGS]) {
1223                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1224                 if (flags & ~NFT_TABLE_F_MASK)
1225                         return -EOPNOTSUPP;
1226         }
1227
1228         err = -ENOMEM;
1229         table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1230         if (table == NULL)
1231                 goto err_kzalloc;
1232
1233         table->validate_state = NFT_VALIDATE_SKIP;
1234         table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1235         if (table->name == NULL)
1236                 goto err_strdup;
1237
1238         if (nla[NFTA_TABLE_USERDATA]) {
1239                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1240                 if (table->udata == NULL)
1241                         goto err_table_udata;
1242
1243                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1244         }
1245
1246         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1247         if (err)
1248                 goto err_chain_ht;
1249
1250         INIT_LIST_HEAD(&table->chains);
1251         INIT_LIST_HEAD(&table->sets);
1252         INIT_LIST_HEAD(&table->objects);
1253         INIT_LIST_HEAD(&table->flowtables);
1254         table->family = family;
1255         table->flags = flags;
1256         table->handle = ++nft_net->table_handle;
1257         if (table->flags & NFT_TABLE_F_OWNER)
1258                 table->nlpid = NETLINK_CB(skb).portid;
1259
1260         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1261         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1262         if (err < 0)
1263                 goto err_trans;
1264
1265         list_add_tail_rcu(&table->list, &nft_net->tables);
1266         return 0;
1267 err_trans:
1268         rhltable_destroy(&table->chains_ht);
1269 err_chain_ht:
1270         kfree(table->udata);
1271 err_table_udata:
1272         kfree(table->name);
1273 err_strdup:
1274         kfree(table);
1275 err_kzalloc:
1276         return err;
1277 }
1278
1279 static int nft_flush_table(struct nft_ctx *ctx)
1280 {
1281         struct nft_flowtable *flowtable, *nft;
1282         struct nft_chain *chain, *nc;
1283         struct nft_object *obj, *ne;
1284         struct nft_set *set, *ns;
1285         int err;
1286
1287         list_for_each_entry(chain, &ctx->table->chains, list) {
1288                 if (!nft_is_active_next(ctx->net, chain))
1289                         continue;
1290
1291                 if (nft_chain_is_bound(chain))
1292                         continue;
1293
1294                 ctx->chain = chain;
1295
1296                 err = nft_delrule_by_chain(ctx);
1297                 if (err < 0)
1298                         goto out;
1299         }
1300
1301         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1302                 if (!nft_is_active_next(ctx->net, set))
1303                         continue;
1304
1305                 if (nft_set_is_anonymous(set) &&
1306                     !list_empty(&set->bindings))
1307                         continue;
1308
1309                 err = nft_delset(ctx, set);
1310                 if (err < 0)
1311                         goto out;
1312         }
1313
1314         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1315                 if (!nft_is_active_next(ctx->net, flowtable))
1316                         continue;
1317
1318                 err = nft_delflowtable(ctx, flowtable);
1319                 if (err < 0)
1320                         goto out;
1321         }
1322
1323         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1324                 if (!nft_is_active_next(ctx->net, obj))
1325                         continue;
1326
1327                 err = nft_delobj(ctx, obj);
1328                 if (err < 0)
1329                         goto out;
1330         }
1331
1332         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1333                 if (!nft_is_active_next(ctx->net, chain))
1334                         continue;
1335
1336                 if (nft_chain_is_bound(chain))
1337                         continue;
1338
1339                 ctx->chain = chain;
1340
1341                 err = nft_delchain(ctx);
1342                 if (err < 0)
1343                         goto out;
1344         }
1345
1346         err = nft_deltable(ctx);
1347 out:
1348         return err;
1349 }
1350
1351 static int nft_flush(struct nft_ctx *ctx, int family)
1352 {
1353         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1354         const struct nlattr * const *nla = ctx->nla;
1355         struct nft_table *table, *nt;
1356         int err = 0;
1357
1358         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1359                 if (family != AF_UNSPEC && table->family != family)
1360                         continue;
1361
1362                 ctx->family = table->family;
1363
1364                 if (!nft_is_active_next(ctx->net, table))
1365                         continue;
1366
1367                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1368                         continue;
1369
1370                 if (nla[NFTA_TABLE_NAME] &&
1371                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1372                         continue;
1373
1374                 ctx->table = table;
1375
1376                 err = nft_flush_table(ctx);
1377                 if (err < 0)
1378                         goto out;
1379         }
1380 out:
1381         return err;
1382 }
1383
1384 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1385                               const struct nlattr * const nla[])
1386 {
1387         struct netlink_ext_ack *extack = info->extack;
1388         u8 genmask = nft_genmask_next(info->net);
1389         u8 family = info->nfmsg->nfgen_family;
1390         struct net *net = info->net;
1391         const struct nlattr *attr;
1392         struct nft_table *table;
1393         struct nft_ctx ctx;
1394
1395         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1396         if (family == AF_UNSPEC ||
1397             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1398                 return nft_flush(&ctx, family);
1399
1400         if (nla[NFTA_TABLE_HANDLE]) {
1401                 attr = nla[NFTA_TABLE_HANDLE];
1402                 table = nft_table_lookup_byhandle(net, attr, genmask,
1403                                                   NETLINK_CB(skb).portid);
1404         } else {
1405                 attr = nla[NFTA_TABLE_NAME];
1406                 table = nft_table_lookup(net, attr, family, genmask,
1407                                          NETLINK_CB(skb).portid);
1408         }
1409
1410         if (IS_ERR(table)) {
1411                 if (PTR_ERR(table) == -ENOENT &&
1412                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1413                         return 0;
1414
1415                 NL_SET_BAD_ATTR(extack, attr);
1416                 return PTR_ERR(table);
1417         }
1418
1419         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1420             table->use > 0)
1421                 return -EBUSY;
1422
1423         ctx.family = family;
1424         ctx.table = table;
1425
1426         return nft_flush_table(&ctx);
1427 }
1428
1429 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1430 {
1431         if (WARN_ON(ctx->table->use > 0))
1432                 return;
1433
1434         rhltable_destroy(&ctx->table->chains_ht);
1435         kfree(ctx->table->name);
1436         kfree(ctx->table->udata);
1437         kfree(ctx->table);
1438 }
1439
1440 void nft_register_chain_type(const struct nft_chain_type *ctype)
1441 {
1442         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1443         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1444                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1445                 return;
1446         }
1447         chain_type[ctype->family][ctype->type] = ctype;
1448         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1449 }
1450 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1451
1452 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1453 {
1454         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1455         chain_type[ctype->family][ctype->type] = NULL;
1456         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1457 }
1458 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1459
1460 /*
1461  * Chains
1462  */
1463
1464 static struct nft_chain *
1465 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1466 {
1467         struct nft_chain *chain;
1468
1469         list_for_each_entry(chain, &table->chains, list) {
1470                 if (chain->handle == handle &&
1471                     nft_active_genmask(chain, genmask))
1472                         return chain;
1473         }
1474
1475         return ERR_PTR(-ENOENT);
1476 }
1477
1478 static bool lockdep_commit_lock_is_held(const struct net *net)
1479 {
1480 #ifdef CONFIG_PROVE_LOCKING
1481         struct nftables_pernet *nft_net = nft_pernet(net);
1482
1483         return lockdep_is_held(&nft_net->commit_mutex);
1484 #else
1485         return true;
1486 #endif
1487 }
1488
1489 static struct nft_chain *nft_chain_lookup(struct net *net,
1490                                           struct nft_table *table,
1491                                           const struct nlattr *nla, u8 genmask)
1492 {
1493         char search[NFT_CHAIN_MAXNAMELEN + 1];
1494         struct rhlist_head *tmp, *list;
1495         struct nft_chain *chain;
1496
1497         if (nla == NULL)
1498                 return ERR_PTR(-EINVAL);
1499
1500         nla_strscpy(search, nla, sizeof(search));
1501
1502         WARN_ON(!rcu_read_lock_held() &&
1503                 !lockdep_commit_lock_is_held(net));
1504
1505         chain = ERR_PTR(-ENOENT);
1506         rcu_read_lock();
1507         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1508         if (!list)
1509                 goto out_unlock;
1510
1511         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1512                 if (nft_active_genmask(chain, genmask))
1513                         goto out_unlock;
1514         }
1515         chain = ERR_PTR(-ENOENT);
1516 out_unlock:
1517         rcu_read_unlock();
1518         return chain;
1519 }
1520
1521 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1522         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1523                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1524         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1525         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1526                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1527         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1528         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1529         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1530                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1531         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1532         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1533         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1534         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1535                                     .len = NFT_USERDATA_MAXLEN },
1536 };
1537
1538 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1539         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1540         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1541         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1542                                     .len = IFNAMSIZ - 1 },
1543 };
1544
1545 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1546 {
1547         struct nft_stats *cpu_stats, total;
1548         struct nlattr *nest;
1549         unsigned int seq;
1550         u64 pkts, bytes;
1551         int cpu;
1552
1553         if (!stats)
1554                 return 0;
1555
1556         memset(&total, 0, sizeof(total));
1557         for_each_possible_cpu(cpu) {
1558                 cpu_stats = per_cpu_ptr(stats, cpu);
1559                 do {
1560                         seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1561                         pkts = cpu_stats->pkts;
1562                         bytes = cpu_stats->bytes;
1563                 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1564                 total.pkts += pkts;
1565                 total.bytes += bytes;
1566         }
1567         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1568         if (nest == NULL)
1569                 goto nla_put_failure;
1570
1571         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1572                          NFTA_COUNTER_PAD) ||
1573             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1574                          NFTA_COUNTER_PAD))
1575                 goto nla_put_failure;
1576
1577         nla_nest_end(skb, nest);
1578         return 0;
1579
1580 nla_put_failure:
1581         return -ENOSPC;
1582 }
1583
1584 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1585                                    const struct nft_base_chain *basechain,
1586                                    const struct list_head *hook_list)
1587 {
1588         const struct nf_hook_ops *ops = &basechain->ops;
1589         struct nft_hook *hook, *first = NULL;
1590         struct nlattr *nest, *nest_devs;
1591         int n = 0;
1592
1593         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1594         if (nest == NULL)
1595                 goto nla_put_failure;
1596         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1597                 goto nla_put_failure;
1598         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1599                 goto nla_put_failure;
1600
1601         if (nft_base_chain_netdev(family, ops->hooknum)) {
1602                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1603
1604                 if (!hook_list)
1605                         hook_list = &basechain->hook_list;
1606
1607                 list_for_each_entry(hook, hook_list, list) {
1608                         if (!first)
1609                                 first = hook;
1610
1611                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1612                                            hook->ops.dev->name))
1613                                 goto nla_put_failure;
1614                         n++;
1615                 }
1616                 nla_nest_end(skb, nest_devs);
1617
1618                 if (n == 1 &&
1619                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1620                         goto nla_put_failure;
1621         }
1622         nla_nest_end(skb, nest);
1623
1624         return 0;
1625 nla_put_failure:
1626         return -1;
1627 }
1628
1629 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1630                                      u32 portid, u32 seq, int event, u32 flags,
1631                                      int family, const struct nft_table *table,
1632                                      const struct nft_chain *chain,
1633                                      const struct list_head *hook_list)
1634 {
1635         struct nlmsghdr *nlh;
1636
1637         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1638         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1639                            NFNETLINK_V0, nft_base_seq(net));
1640         if (!nlh)
1641                 goto nla_put_failure;
1642
1643         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1644             nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1645             nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1646                          NFTA_CHAIN_PAD))
1647                 goto nla_put_failure;
1648
1649         if (event == NFT_MSG_DELCHAIN) {
1650                 nlmsg_end(skb, nlh);
1651                 return 0;
1652         }
1653
1654         if (nft_is_base_chain(chain)) {
1655                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1656                 struct nft_stats __percpu *stats;
1657
1658                 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1659                         goto nla_put_failure;
1660
1661                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1662                                  htonl(basechain->policy)))
1663                         goto nla_put_failure;
1664
1665                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1666                         goto nla_put_failure;
1667
1668                 stats = rcu_dereference_check(basechain->stats,
1669                                               lockdep_commit_lock_is_held(net));
1670                 if (nft_dump_stats(skb, stats))
1671                         goto nla_put_failure;
1672         }
1673
1674         if (chain->flags &&
1675             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1676                 goto nla_put_failure;
1677
1678         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1679                 goto nla_put_failure;
1680
1681         if (chain->udata &&
1682             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1683                 goto nla_put_failure;
1684
1685         nlmsg_end(skb, nlh);
1686         return 0;
1687
1688 nla_put_failure:
1689         nlmsg_trim(skb, nlh);
1690         return -1;
1691 }
1692
1693 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1694                                    const struct list_head *hook_list)
1695 {
1696         struct nftables_pernet *nft_net;
1697         struct sk_buff *skb;
1698         u16 flags = 0;
1699         int err;
1700
1701         if (!ctx->report &&
1702             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1703                 return;
1704
1705         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1706         if (skb == NULL)
1707                 goto err;
1708
1709         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1710                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1711
1712         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1713                                         event, flags, ctx->family, ctx->table,
1714                                         ctx->chain, hook_list);
1715         if (err < 0) {
1716                 kfree_skb(skb);
1717                 goto err;
1718         }
1719
1720         nft_net = nft_pernet(ctx->net);
1721         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1722         return;
1723 err:
1724         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1725 }
1726
1727 static int nf_tables_dump_chains(struct sk_buff *skb,
1728                                  struct netlink_callback *cb)
1729 {
1730         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1731         unsigned int idx = 0, s_idx = cb->args[0];
1732         struct net *net = sock_net(skb->sk);
1733         int family = nfmsg->nfgen_family;
1734         struct nftables_pernet *nft_net;
1735         const struct nft_table *table;
1736         const struct nft_chain *chain;
1737
1738         rcu_read_lock();
1739         nft_net = nft_pernet(net);
1740         cb->seq = READ_ONCE(nft_net->base_seq);
1741
1742         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1743                 if (family != NFPROTO_UNSPEC && family != table->family)
1744                         continue;
1745
1746                 list_for_each_entry_rcu(chain, &table->chains, list) {
1747                         if (idx < s_idx)
1748                                 goto cont;
1749                         if (idx > s_idx)
1750                                 memset(&cb->args[1], 0,
1751                                        sizeof(cb->args) - sizeof(cb->args[0]));
1752                         if (!nft_is_active(net, chain))
1753                                 continue;
1754                         if (nf_tables_fill_chain_info(skb, net,
1755                                                       NETLINK_CB(cb->skb).portid,
1756                                                       cb->nlh->nlmsg_seq,
1757                                                       NFT_MSG_NEWCHAIN,
1758                                                       NLM_F_MULTI,
1759                                                       table->family, table,
1760                                                       chain, NULL) < 0)
1761                                 goto done;
1762
1763                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1764 cont:
1765                         idx++;
1766                 }
1767         }
1768 done:
1769         rcu_read_unlock();
1770         cb->args[0] = idx;
1771         return skb->len;
1772 }
1773
1774 /* called with rcu_read_lock held */
1775 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1776                               const struct nlattr * const nla[])
1777 {
1778         struct netlink_ext_ack *extack = info->extack;
1779         u8 genmask = nft_genmask_cur(info->net);
1780         u8 family = info->nfmsg->nfgen_family;
1781         const struct nft_chain *chain;
1782         struct net *net = info->net;
1783         struct nft_table *table;
1784         struct sk_buff *skb2;
1785         int err;
1786
1787         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1788                 struct netlink_dump_control c = {
1789                         .dump = nf_tables_dump_chains,
1790                         .module = THIS_MODULE,
1791                 };
1792
1793                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1794         }
1795
1796         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1797         if (IS_ERR(table)) {
1798                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1799                 return PTR_ERR(table);
1800         }
1801
1802         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1803         if (IS_ERR(chain)) {
1804                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1805                 return PTR_ERR(chain);
1806         }
1807
1808         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1809         if (!skb2)
1810                 return -ENOMEM;
1811
1812         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1813                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1814                                         0, family, table, chain, NULL);
1815         if (err < 0)
1816                 goto err_fill_chain_info;
1817
1818         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1819
1820 err_fill_chain_info:
1821         kfree_skb(skb2);
1822         return err;
1823 }
1824
1825 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1826         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1827         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1828 };
1829
1830 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1831 {
1832         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1833         struct nft_stats __percpu *newstats;
1834         struct nft_stats *stats;
1835         int err;
1836
1837         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1838                                           nft_counter_policy, NULL);
1839         if (err < 0)
1840                 return ERR_PTR(err);
1841
1842         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1843                 return ERR_PTR(-EINVAL);
1844
1845         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1846         if (newstats == NULL)
1847                 return ERR_PTR(-ENOMEM);
1848
1849         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1850          * are not exposed to userspace.
1851          */
1852         preempt_disable();
1853         stats = this_cpu_ptr(newstats);
1854         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1855         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1856         preempt_enable();
1857
1858         return newstats;
1859 }
1860
1861 static void nft_chain_stats_replace(struct nft_trans *trans)
1862 {
1863         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1864
1865         if (!nft_trans_chain_stats(trans))
1866                 return;
1867
1868         nft_trans_chain_stats(trans) =
1869                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1870                                     lockdep_commit_lock_is_held(trans->ctx.net));
1871
1872         if (!nft_trans_chain_stats(trans))
1873                 static_branch_inc(&nft_counters_enabled);
1874 }
1875
1876 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1877 {
1878         struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
1879         struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
1880
1881         if (g0 != g1)
1882                 kvfree(g1);
1883         kvfree(g0);
1884
1885         /* should be NULL either via abort or via successful commit */
1886         WARN_ON_ONCE(chain->blob_next);
1887         kvfree(chain->blob_next);
1888 }
1889
1890 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1891 {
1892         struct nft_chain *chain = ctx->chain;
1893         struct nft_hook *hook, *next;
1894
1895         if (WARN_ON(chain->use > 0))
1896                 return;
1897
1898         /* no concurrent access possible anymore */
1899         nf_tables_chain_free_chain_rules(chain);
1900
1901         if (nft_is_base_chain(chain)) {
1902                 struct nft_base_chain *basechain = nft_base_chain(chain);
1903
1904                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1905                         list_for_each_entry_safe(hook, next,
1906                                                  &basechain->hook_list, list) {
1907                                 list_del_rcu(&hook->list);
1908                                 kfree_rcu(hook, rcu);
1909                         }
1910                 }
1911                 module_put(basechain->type->owner);
1912                 if (rcu_access_pointer(basechain->stats)) {
1913                         static_branch_dec(&nft_counters_enabled);
1914                         free_percpu(rcu_dereference_raw(basechain->stats));
1915                 }
1916                 kfree(chain->name);
1917                 kfree(chain->udata);
1918                 kfree(basechain);
1919         } else {
1920                 kfree(chain->name);
1921                 kfree(chain->udata);
1922                 kfree(chain);
1923         }
1924 }
1925
1926 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1927                                               const struct nlattr *attr)
1928 {
1929         struct net_device *dev;
1930         char ifname[IFNAMSIZ];
1931         struct nft_hook *hook;
1932         int err;
1933
1934         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
1935         if (!hook) {
1936                 err = -ENOMEM;
1937                 goto err_hook_alloc;
1938         }
1939
1940         nla_strscpy(ifname, attr, IFNAMSIZ);
1941         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1942          * indirectly serializing all the other holders of the commit_mutex with
1943          * the rtnl_mutex.
1944          */
1945         dev = __dev_get_by_name(net, ifname);
1946         if (!dev) {
1947                 err = -ENOENT;
1948                 goto err_hook_dev;
1949         }
1950         hook->ops.dev = dev;
1951
1952         return hook;
1953
1954 err_hook_dev:
1955         kfree(hook);
1956 err_hook_alloc:
1957         return ERR_PTR(err);
1958 }
1959
1960 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1961                                            const struct nft_hook *this)
1962 {
1963         struct nft_hook *hook;
1964
1965         list_for_each_entry(hook, hook_list, list) {
1966                 if (this->ops.dev == hook->ops.dev)
1967                         return hook;
1968         }
1969
1970         return NULL;
1971 }
1972
1973 static int nf_tables_parse_netdev_hooks(struct net *net,
1974                                         const struct nlattr *attr,
1975                                         struct list_head *hook_list,
1976                                         struct netlink_ext_ack *extack)
1977 {
1978         struct nft_hook *hook, *next;
1979         const struct nlattr *tmp;
1980         int rem, n = 0, err;
1981
1982         nla_for_each_nested(tmp, attr, rem) {
1983                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1984                         err = -EINVAL;
1985                         goto err_hook;
1986                 }
1987
1988                 hook = nft_netdev_hook_alloc(net, tmp);
1989                 if (IS_ERR(hook)) {
1990                         NL_SET_BAD_ATTR(extack, tmp);
1991                         err = PTR_ERR(hook);
1992                         goto err_hook;
1993                 }
1994                 if (nft_hook_list_find(hook_list, hook)) {
1995                         NL_SET_BAD_ATTR(extack, tmp);
1996                         kfree(hook);
1997                         err = -EEXIST;
1998                         goto err_hook;
1999                 }
2000                 list_add_tail(&hook->list, hook_list);
2001                 n++;
2002
2003                 if (n == NFT_NETDEVICE_MAX) {
2004                         err = -EFBIG;
2005                         goto err_hook;
2006                 }
2007         }
2008
2009         return 0;
2010
2011 err_hook:
2012         list_for_each_entry_safe(hook, next, hook_list, list) {
2013                 list_del(&hook->list);
2014                 kfree(hook);
2015         }
2016         return err;
2017 }
2018
2019 struct nft_chain_hook {
2020         u32                             num;
2021         s32                             priority;
2022         const struct nft_chain_type     *type;
2023         struct list_head                list;
2024 };
2025
2026 static int nft_chain_parse_netdev(struct net *net,
2027                                   struct nlattr *tb[],
2028                                   struct list_head *hook_list,
2029                                   struct netlink_ext_ack *extack)
2030 {
2031         struct nft_hook *hook;
2032         int err;
2033
2034         if (tb[NFTA_HOOK_DEV]) {
2035                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2036                 if (IS_ERR(hook)) {
2037                         NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2038                         return PTR_ERR(hook);
2039                 }
2040
2041                 list_add_tail(&hook->list, hook_list);
2042         } else if (tb[NFTA_HOOK_DEVS]) {
2043                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2044                                                    hook_list, extack);
2045                 if (err < 0)
2046                         return err;
2047
2048                 if (list_empty(hook_list))
2049                         return -EINVAL;
2050         } else {
2051                 return -EINVAL;
2052         }
2053
2054         return 0;
2055 }
2056
2057 static int nft_chain_parse_hook(struct net *net,
2058                                 struct nft_base_chain *basechain,
2059                                 const struct nlattr * const nla[],
2060                                 struct nft_chain_hook *hook, u8 family,
2061                                 struct netlink_ext_ack *extack)
2062 {
2063         struct nftables_pernet *nft_net = nft_pernet(net);
2064         struct nlattr *ha[NFTA_HOOK_MAX + 1];
2065         const struct nft_chain_type *type;
2066         int err;
2067
2068         lockdep_assert_held(&nft_net->commit_mutex);
2069         lockdep_nfnl_nft_mutex_not_held();
2070
2071         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2072                                           nla[NFTA_CHAIN_HOOK],
2073                                           nft_hook_policy, NULL);
2074         if (err < 0)
2075                 return err;
2076
2077         if (!basechain) {
2078                 if (!ha[NFTA_HOOK_HOOKNUM] ||
2079                     !ha[NFTA_HOOK_PRIORITY])
2080                         return -EINVAL;
2081
2082                 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2083                 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2084
2085                 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2086                 if (!type)
2087                         return -EOPNOTSUPP;
2088
2089                 if (nla[NFTA_CHAIN_TYPE]) {
2090                         type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2091                                                            family, true);
2092                         if (IS_ERR(type)) {
2093                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2094                                 return PTR_ERR(type);
2095                         }
2096                 }
2097                 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2098                         return -EOPNOTSUPP;
2099
2100                 if (type->type == NFT_CHAIN_T_NAT &&
2101                     hook->priority <= NF_IP_PRI_CONNTRACK)
2102                         return -EOPNOTSUPP;
2103         } else {
2104                 if (ha[NFTA_HOOK_HOOKNUM]) {
2105                         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2106                         if (hook->num != basechain->ops.hooknum)
2107                                 return -EOPNOTSUPP;
2108                 }
2109                 if (ha[NFTA_HOOK_PRIORITY]) {
2110                         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2111                         if (hook->priority != basechain->ops.priority)
2112                                 return -EOPNOTSUPP;
2113                 }
2114
2115                 type = basechain->type;
2116         }
2117
2118         if (!try_module_get(type->owner)) {
2119                 if (nla[NFTA_CHAIN_TYPE])
2120                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2121                 return -ENOENT;
2122         }
2123
2124         hook->type = type;
2125
2126         INIT_LIST_HEAD(&hook->list);
2127         if (nft_base_chain_netdev(family, hook->num)) {
2128                 err = nft_chain_parse_netdev(net, ha, &hook->list, extack);
2129                 if (err < 0) {
2130                         module_put(type->owner);
2131                         return err;
2132                 }
2133         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2134                 module_put(type->owner);
2135                 return -EOPNOTSUPP;
2136         }
2137
2138         return 0;
2139 }
2140
2141 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2142 {
2143         struct nft_hook *h, *next;
2144
2145         list_for_each_entry_safe(h, next, &hook->list, list) {
2146                 list_del(&h->list);
2147                 kfree(h);
2148         }
2149         module_put(hook->type->owner);
2150 }
2151
2152 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2153 {
2154         struct nft_rule_dp_last *lrule;
2155
2156         BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2157
2158         lrule = (struct nft_rule_dp_last *)ptr;
2159         lrule->end.is_last = 1;
2160         lrule->chain = chain;
2161         /* blob size does not include the trailer rule */
2162 }
2163
2164 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2165                                                          unsigned int size)
2166 {
2167         struct nft_rule_blob *blob;
2168
2169         if (size > INT_MAX)
2170                 return NULL;
2171
2172         size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2173
2174         blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2175         if (!blob)
2176                 return NULL;
2177
2178         blob->size = 0;
2179         nft_last_rule(chain, blob->data);
2180
2181         return blob;
2182 }
2183
2184 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2185                                     const struct nft_chain_hook *hook,
2186                                     struct nft_chain *chain)
2187 {
2188         ops->pf                 = family;
2189         ops->hooknum            = hook->num;
2190         ops->priority           = hook->priority;
2191         ops->priv               = chain;
2192         ops->hook               = hook->type->hooks[ops->hooknum];
2193         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2194 }
2195
2196 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2197                               struct nft_chain_hook *hook, u32 flags)
2198 {
2199         struct nft_chain *chain;
2200         struct nft_hook *h;
2201
2202         basechain->type = hook->type;
2203         INIT_LIST_HEAD(&basechain->hook_list);
2204         chain = &basechain->chain;
2205
2206         if (nft_base_chain_netdev(family, hook->num)) {
2207                 list_splice_init(&hook->list, &basechain->hook_list);
2208                 list_for_each_entry(h, &basechain->hook_list, list)
2209                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2210         }
2211         nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2212
2213         chain->flags |= NFT_CHAIN_BASE | flags;
2214         basechain->policy = NF_ACCEPT;
2215         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2216             !nft_chain_offload_support(basechain)) {
2217                 list_splice_init(&basechain->hook_list, &hook->list);
2218                 return -EOPNOTSUPP;
2219         }
2220
2221         flow_block_init(&basechain->flow_block);
2222
2223         return 0;
2224 }
2225
2226 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2227 {
2228         int err;
2229
2230         err = rhltable_insert_key(&table->chains_ht, chain->name,
2231                                   &chain->rhlhead, nft_chain_ht_params);
2232         if (err)
2233                 return err;
2234
2235         list_add_tail_rcu(&chain->list, &table->chains);
2236
2237         return 0;
2238 }
2239
2240 static u64 chain_id;
2241
2242 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2243                               u8 policy, u32 flags,
2244                               struct netlink_ext_ack *extack)
2245 {
2246         const struct nlattr * const *nla = ctx->nla;
2247         struct nft_table *table = ctx->table;
2248         struct nft_base_chain *basechain;
2249         struct net *net = ctx->net;
2250         char name[NFT_NAME_MAXLEN];
2251         struct nft_rule_blob *blob;
2252         struct nft_trans *trans;
2253         struct nft_chain *chain;
2254         int err;
2255
2256         if (table->use == UINT_MAX)
2257                 return -EOVERFLOW;
2258
2259         if (nla[NFTA_CHAIN_HOOK]) {
2260                 struct nft_stats __percpu *stats = NULL;
2261                 struct nft_chain_hook hook = {};
2262
2263                 if (flags & NFT_CHAIN_BINDING)
2264                         return -EOPNOTSUPP;
2265
2266                 err = nft_chain_parse_hook(net, NULL, nla, &hook, family,
2267                                            extack);
2268                 if (err < 0)
2269                         return err;
2270
2271                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2272                 if (basechain == NULL) {
2273                         nft_chain_release_hook(&hook);
2274                         return -ENOMEM;
2275                 }
2276                 chain = &basechain->chain;
2277
2278                 if (nla[NFTA_CHAIN_COUNTERS]) {
2279                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2280                         if (IS_ERR(stats)) {
2281                                 nft_chain_release_hook(&hook);
2282                                 kfree(basechain);
2283                                 return PTR_ERR(stats);
2284                         }
2285                         rcu_assign_pointer(basechain->stats, stats);
2286                 }
2287
2288                 err = nft_basechain_init(basechain, family, &hook, flags);
2289                 if (err < 0) {
2290                         nft_chain_release_hook(&hook);
2291                         kfree(basechain);
2292                         free_percpu(stats);
2293                         return err;
2294                 }
2295                 if (stats)
2296                         static_branch_inc(&nft_counters_enabled);
2297         } else {
2298                 if (flags & NFT_CHAIN_BASE)
2299                         return -EINVAL;
2300                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2301                         return -EOPNOTSUPP;
2302
2303                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2304                 if (chain == NULL)
2305                         return -ENOMEM;
2306
2307                 chain->flags = flags;
2308         }
2309         ctx->chain = chain;
2310
2311         INIT_LIST_HEAD(&chain->rules);
2312         chain->handle = nf_tables_alloc_handle(table);
2313         chain->table = table;
2314
2315         if (nla[NFTA_CHAIN_NAME]) {
2316                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2317         } else {
2318                 if (!(flags & NFT_CHAIN_BINDING)) {
2319                         err = -EINVAL;
2320                         goto err_destroy_chain;
2321                 }
2322
2323                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2324                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2325         }
2326
2327         if (!chain->name) {
2328                 err = -ENOMEM;
2329                 goto err_destroy_chain;
2330         }
2331
2332         if (nla[NFTA_CHAIN_USERDATA]) {
2333                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2334                 if (chain->udata == NULL) {
2335                         err = -ENOMEM;
2336                         goto err_destroy_chain;
2337                 }
2338                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2339         }
2340
2341         blob = nf_tables_chain_alloc_rules(chain, 0);
2342         if (!blob) {
2343                 err = -ENOMEM;
2344                 goto err_destroy_chain;
2345         }
2346
2347         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2348         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2349
2350         err = nf_tables_register_hook(net, table, chain);
2351         if (err < 0)
2352                 goto err_destroy_chain;
2353
2354         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2355         if (IS_ERR(trans)) {
2356                 err = PTR_ERR(trans);
2357                 goto err_unregister_hook;
2358         }
2359
2360         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2361         if (nft_is_base_chain(chain))
2362                 nft_trans_chain_policy(trans) = policy;
2363
2364         err = nft_chain_add(table, chain);
2365         if (err < 0) {
2366                 nft_trans_destroy(trans);
2367                 goto err_unregister_hook;
2368         }
2369
2370         table->use++;
2371
2372         return 0;
2373 err_unregister_hook:
2374         nf_tables_unregister_hook(net, table, chain);
2375 err_destroy_chain:
2376         nf_tables_chain_destroy(ctx);
2377
2378         return err;
2379 }
2380
2381 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2382                               u32 flags, const struct nlattr *attr,
2383                               struct netlink_ext_ack *extack)
2384 {
2385         const struct nlattr * const *nla = ctx->nla;
2386         struct nft_base_chain *basechain = NULL;
2387         struct nft_table *table = ctx->table;
2388         struct nft_chain *chain = ctx->chain;
2389         struct nft_chain_hook hook = {};
2390         struct nft_stats *stats = NULL;
2391         struct nft_hook *h, *next;
2392         struct nf_hook_ops *ops;
2393         struct nft_trans *trans;
2394         bool unregister = false;
2395         int err;
2396
2397         if (chain->flags ^ flags)
2398                 return -EOPNOTSUPP;
2399
2400         INIT_LIST_HEAD(&hook.list);
2401
2402         if (nla[NFTA_CHAIN_HOOK]) {
2403                 if (!nft_is_base_chain(chain)) {
2404                         NL_SET_BAD_ATTR(extack, attr);
2405                         return -EEXIST;
2406                 }
2407
2408                 basechain = nft_base_chain(chain);
2409                 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2410                                            ctx->family, extack);
2411                 if (err < 0)
2412                         return err;
2413
2414                 if (basechain->type != hook.type) {
2415                         nft_chain_release_hook(&hook);
2416                         NL_SET_BAD_ATTR(extack, attr);
2417                         return -EEXIST;
2418                 }
2419
2420                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2421                         list_for_each_entry_safe(h, next, &hook.list, list) {
2422                                 h->ops.pf       = basechain->ops.pf;
2423                                 h->ops.hooknum  = basechain->ops.hooknum;
2424                                 h->ops.priority = basechain->ops.priority;
2425                                 h->ops.priv     = basechain->ops.priv;
2426                                 h->ops.hook     = basechain->ops.hook;
2427
2428                                 if (nft_hook_list_find(&basechain->hook_list, h)) {
2429                                         list_del(&h->list);
2430                                         kfree(h);
2431                                 }
2432                         }
2433                 } else {
2434                         ops = &basechain->ops;
2435                         if (ops->hooknum != hook.num ||
2436                             ops->priority != hook.priority) {
2437                                 nft_chain_release_hook(&hook);
2438                                 NL_SET_BAD_ATTR(extack, attr);
2439                                 return -EEXIST;
2440                         }
2441                 }
2442         }
2443
2444         if (nla[NFTA_CHAIN_HANDLE] &&
2445             nla[NFTA_CHAIN_NAME]) {
2446                 struct nft_chain *chain2;
2447
2448                 chain2 = nft_chain_lookup(ctx->net, table,
2449                                           nla[NFTA_CHAIN_NAME], genmask);
2450                 if (!IS_ERR(chain2)) {
2451                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2452                         err = -EEXIST;
2453                         goto err_hooks;
2454                 }
2455         }
2456
2457         if (nla[NFTA_CHAIN_COUNTERS]) {
2458                 if (!nft_is_base_chain(chain)) {
2459                         err = -EOPNOTSUPP;
2460                         goto err_hooks;
2461                 }
2462
2463                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2464                 if (IS_ERR(stats)) {
2465                         err = PTR_ERR(stats);
2466                         goto err_hooks;
2467                 }
2468         }
2469
2470         if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2471             nft_is_base_chain(chain) &&
2472             !list_empty(&hook.list)) {
2473                 basechain = nft_base_chain(chain);
2474                 ops = &basechain->ops;
2475
2476                 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2477                         err = nft_netdev_register_hooks(ctx->net, &hook.list);
2478                         if (err < 0)
2479                                 goto err_hooks;
2480                 }
2481         }
2482
2483         unregister = true;
2484         err = -ENOMEM;
2485         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2486                                 sizeof(struct nft_trans_chain));
2487         if (trans == NULL)
2488                 goto err_trans;
2489
2490         nft_trans_chain_stats(trans) = stats;
2491         nft_trans_chain_update(trans) = true;
2492
2493         if (nla[NFTA_CHAIN_POLICY])
2494                 nft_trans_chain_policy(trans) = policy;
2495         else
2496                 nft_trans_chain_policy(trans) = -1;
2497
2498         if (nla[NFTA_CHAIN_HANDLE] &&
2499             nla[NFTA_CHAIN_NAME]) {
2500                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2501                 struct nft_trans *tmp;
2502                 char *name;
2503
2504                 err = -ENOMEM;
2505                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2506                 if (!name)
2507                         goto err_trans;
2508
2509                 err = -EEXIST;
2510                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2511                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2512                             tmp->ctx.table == table &&
2513                             nft_trans_chain_update(tmp) &&
2514                             nft_trans_chain_name(tmp) &&
2515                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2516                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2517                                 kfree(name);
2518                                 goto err_trans;
2519                         }
2520                 }
2521
2522                 nft_trans_chain_name(trans) = name;
2523         }
2524
2525         nft_trans_basechain(trans) = basechain;
2526         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2527         list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2528
2529         nft_trans_commit_list_add_tail(ctx->net, trans);
2530
2531         return 0;
2532
2533 err_trans:
2534         free_percpu(stats);
2535         kfree(trans);
2536 err_hooks:
2537         if (nla[NFTA_CHAIN_HOOK]) {
2538                 list_for_each_entry_safe(h, next, &hook.list, list) {
2539                         if (unregister)
2540                                 nf_unregister_net_hook(ctx->net, &h->ops);
2541                         list_del(&h->list);
2542                         kfree_rcu(h, rcu);
2543                 }
2544                 module_put(hook.type->owner);
2545         }
2546
2547         return err;
2548 }
2549
2550 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2551                                                const struct nft_table *table,
2552                                                const struct nlattr *nla)
2553 {
2554         struct nftables_pernet *nft_net = nft_pernet(net);
2555         u32 id = ntohl(nla_get_be32(nla));
2556         struct nft_trans *trans;
2557
2558         list_for_each_entry(trans, &nft_net->commit_list, list) {
2559                 struct nft_chain *chain = trans->ctx.chain;
2560
2561                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2562                     chain->table == table &&
2563                     id == nft_trans_chain_id(trans))
2564                         return chain;
2565         }
2566         return ERR_PTR(-ENOENT);
2567 }
2568
2569 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2570                               const struct nlattr * const nla[])
2571 {
2572         struct nftables_pernet *nft_net = nft_pernet(info->net);
2573         struct netlink_ext_ack *extack = info->extack;
2574         u8 genmask = nft_genmask_next(info->net);
2575         u8 family = info->nfmsg->nfgen_family;
2576         struct nft_chain *chain = NULL;
2577         struct net *net = info->net;
2578         const struct nlattr *attr;
2579         struct nft_table *table;
2580         u8 policy = NF_ACCEPT;
2581         struct nft_ctx ctx;
2582         u64 handle = 0;
2583         u32 flags = 0;
2584
2585         lockdep_assert_held(&nft_net->commit_mutex);
2586
2587         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2588                                  NETLINK_CB(skb).portid);
2589         if (IS_ERR(table)) {
2590                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2591                 return PTR_ERR(table);
2592         }
2593
2594         chain = NULL;
2595         attr = nla[NFTA_CHAIN_NAME];
2596
2597         if (nla[NFTA_CHAIN_HANDLE]) {
2598                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2599                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2600                 if (IS_ERR(chain)) {
2601                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2602                         return PTR_ERR(chain);
2603                 }
2604                 attr = nla[NFTA_CHAIN_HANDLE];
2605         } else if (nla[NFTA_CHAIN_NAME]) {
2606                 chain = nft_chain_lookup(net, table, attr, genmask);
2607                 if (IS_ERR(chain)) {
2608                         if (PTR_ERR(chain) != -ENOENT) {
2609                                 NL_SET_BAD_ATTR(extack, attr);
2610                                 return PTR_ERR(chain);
2611                         }
2612                         chain = NULL;
2613                 }
2614         } else if (!nla[NFTA_CHAIN_ID]) {
2615                 return -EINVAL;
2616         }
2617
2618         if (nla[NFTA_CHAIN_POLICY]) {
2619                 if (chain != NULL &&
2620                     !nft_is_base_chain(chain)) {
2621                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2622                         return -EOPNOTSUPP;
2623                 }
2624
2625                 if (chain == NULL &&
2626                     nla[NFTA_CHAIN_HOOK] == NULL) {
2627                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2628                         return -EOPNOTSUPP;
2629                 }
2630
2631                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2632                 switch (policy) {
2633                 case NF_DROP:
2634                 case NF_ACCEPT:
2635                         break;
2636                 default:
2637                         return -EINVAL;
2638                 }
2639         }
2640
2641         if (nla[NFTA_CHAIN_FLAGS])
2642                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2643         else if (chain)
2644                 flags = chain->flags;
2645
2646         if (flags & ~NFT_CHAIN_FLAGS)
2647                 return -EOPNOTSUPP;
2648
2649         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2650
2651         if (chain != NULL) {
2652                 if (chain->flags & NFT_CHAIN_BINDING)
2653                         return -EINVAL;
2654
2655                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2656                         NL_SET_BAD_ATTR(extack, attr);
2657                         return -EEXIST;
2658                 }
2659                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2660                         return -EOPNOTSUPP;
2661
2662                 flags |= chain->flags & NFT_CHAIN_BASE;
2663                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2664                                           extack);
2665         }
2666
2667         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2668 }
2669
2670 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2671                               const struct nlattr * const nla[])
2672 {
2673         struct netlink_ext_ack *extack = info->extack;
2674         u8 genmask = nft_genmask_next(info->net);
2675         u8 family = info->nfmsg->nfgen_family;
2676         struct net *net = info->net;
2677         const struct nlattr *attr;
2678         struct nft_table *table;
2679         struct nft_chain *chain;
2680         struct nft_rule *rule;
2681         struct nft_ctx ctx;
2682         u64 handle;
2683         u32 use;
2684         int err;
2685
2686         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2687                                  NETLINK_CB(skb).portid);
2688         if (IS_ERR(table)) {
2689                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2690                 return PTR_ERR(table);
2691         }
2692
2693         if (nla[NFTA_CHAIN_HANDLE]) {
2694                 attr = nla[NFTA_CHAIN_HANDLE];
2695                 handle = be64_to_cpu(nla_get_be64(attr));
2696                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2697         } else {
2698                 attr = nla[NFTA_CHAIN_NAME];
2699                 chain = nft_chain_lookup(net, table, attr, genmask);
2700         }
2701         if (IS_ERR(chain)) {
2702                 if (PTR_ERR(chain) == -ENOENT &&
2703                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2704                         return 0;
2705
2706                 NL_SET_BAD_ATTR(extack, attr);
2707                 return PTR_ERR(chain);
2708         }
2709
2710         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2711             chain->use > 0)
2712                 return -EBUSY;
2713
2714         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2715
2716         use = chain->use;
2717         list_for_each_entry(rule, &chain->rules, list) {
2718                 if (!nft_is_active_next(net, rule))
2719                         continue;
2720                 use--;
2721
2722                 err = nft_delrule(&ctx, rule);
2723                 if (err < 0)
2724                         return err;
2725         }
2726
2727         /* There are rules and elements that are still holding references to us,
2728          * we cannot do a recursive removal in this case.
2729          */
2730         if (use > 0) {
2731                 NL_SET_BAD_ATTR(extack, attr);
2732                 return -EBUSY;
2733         }
2734
2735         return nft_delchain(&ctx);
2736 }
2737
2738 /*
2739  * Expressions
2740  */
2741
2742 /**
2743  *      nft_register_expr - register nf_tables expr type
2744  *      @type: expr type
2745  *
2746  *      Registers the expr type for use with nf_tables. Returns zero on
2747  *      success or a negative errno code otherwise.
2748  */
2749 int nft_register_expr(struct nft_expr_type *type)
2750 {
2751         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2752         if (type->family == NFPROTO_UNSPEC)
2753                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2754         else
2755                 list_add_rcu(&type->list, &nf_tables_expressions);
2756         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2757         return 0;
2758 }
2759 EXPORT_SYMBOL_GPL(nft_register_expr);
2760
2761 /**
2762  *      nft_unregister_expr - unregister nf_tables expr type
2763  *      @type: expr type
2764  *
2765  *      Unregisters the expr typefor use with nf_tables.
2766  */
2767 void nft_unregister_expr(struct nft_expr_type *type)
2768 {
2769         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2770         list_del_rcu(&type->list);
2771         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2772 }
2773 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2774
2775 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2776                                                        struct nlattr *nla)
2777 {
2778         const struct nft_expr_type *type, *candidate = NULL;
2779
2780         list_for_each_entry(type, &nf_tables_expressions, list) {
2781                 if (!nla_strcmp(nla, type->name)) {
2782                         if (!type->family && !candidate)
2783                                 candidate = type;
2784                         else if (type->family == family)
2785                                 candidate = type;
2786                 }
2787         }
2788         return candidate;
2789 }
2790
2791 #ifdef CONFIG_MODULES
2792 static int nft_expr_type_request_module(struct net *net, u8 family,
2793                                         struct nlattr *nla)
2794 {
2795         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2796                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2797                 return -EAGAIN;
2798
2799         return 0;
2800 }
2801 #endif
2802
2803 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2804                                                      u8 family,
2805                                                      struct nlattr *nla)
2806 {
2807         const struct nft_expr_type *type;
2808
2809         if (nla == NULL)
2810                 return ERR_PTR(-EINVAL);
2811
2812         type = __nft_expr_type_get(family, nla);
2813         if (type != NULL && try_module_get(type->owner))
2814                 return type;
2815
2816         lockdep_nfnl_nft_mutex_not_held();
2817 #ifdef CONFIG_MODULES
2818         if (type == NULL) {
2819                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2820                         return ERR_PTR(-EAGAIN);
2821
2822                 if (nft_request_module(net, "nft-expr-%.*s",
2823                                        nla_len(nla),
2824                                        (char *)nla_data(nla)) == -EAGAIN)
2825                         return ERR_PTR(-EAGAIN);
2826         }
2827 #endif
2828         return ERR_PTR(-ENOENT);
2829 }
2830
2831 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2832         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2833                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2834         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2835 };
2836
2837 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2838                                     const struct nft_expr *expr, bool reset)
2839 {
2840         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2841                 goto nla_put_failure;
2842
2843         if (expr->ops->dump) {
2844                 struct nlattr *data = nla_nest_start_noflag(skb,
2845                                                             NFTA_EXPR_DATA);
2846                 if (data == NULL)
2847                         goto nla_put_failure;
2848                 if (expr->ops->dump(skb, expr, reset) < 0)
2849                         goto nla_put_failure;
2850                 nla_nest_end(skb, data);
2851         }
2852
2853         return skb->len;
2854
2855 nla_put_failure:
2856         return -1;
2857 };
2858
2859 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2860                   const struct nft_expr *expr, bool reset)
2861 {
2862         struct nlattr *nest;
2863
2864         nest = nla_nest_start_noflag(skb, attr);
2865         if (!nest)
2866                 goto nla_put_failure;
2867         if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
2868                 goto nla_put_failure;
2869         nla_nest_end(skb, nest);
2870         return 0;
2871
2872 nla_put_failure:
2873         return -1;
2874 }
2875
2876 struct nft_expr_info {
2877         const struct nft_expr_ops       *ops;
2878         const struct nlattr             *attr;
2879         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2880 };
2881
2882 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2883                                 const struct nlattr *nla,
2884                                 struct nft_expr_info *info)
2885 {
2886         const struct nft_expr_type *type;
2887         const struct nft_expr_ops *ops;
2888         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2889         int err;
2890
2891         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2892                                           nft_expr_policy, NULL);
2893         if (err < 0)
2894                 return err;
2895
2896         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2897         if (IS_ERR(type))
2898                 return PTR_ERR(type);
2899
2900         if (tb[NFTA_EXPR_DATA]) {
2901                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2902                                                   tb[NFTA_EXPR_DATA],
2903                                                   type->policy, NULL);
2904                 if (err < 0)
2905                         goto err1;
2906         } else
2907                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2908
2909         if (type->select_ops != NULL) {
2910                 ops = type->select_ops(ctx,
2911                                        (const struct nlattr * const *)info->tb);
2912                 if (IS_ERR(ops)) {
2913                         err = PTR_ERR(ops);
2914 #ifdef CONFIG_MODULES
2915                         if (err == -EAGAIN)
2916                                 if (nft_expr_type_request_module(ctx->net,
2917                                                                  ctx->family,
2918                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2919                                         err = -ENOENT;
2920 #endif
2921                         goto err1;
2922                 }
2923         } else
2924                 ops = type->ops;
2925
2926         info->attr = nla;
2927         info->ops = ops;
2928
2929         return 0;
2930
2931 err1:
2932         module_put(type->owner);
2933         return err;
2934 }
2935
2936 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
2937                          struct nft_expr_info *info)
2938 {
2939         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2940         const struct nft_expr_type *type;
2941         int err;
2942
2943         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2944                                           nft_expr_policy, NULL);
2945         if (err < 0)
2946                 return err;
2947
2948         if (!tb[NFTA_EXPR_DATA])
2949                 return -EINVAL;
2950
2951         type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
2952         if (!type)
2953                 return -ENOENT;
2954
2955         if (!type->inner_ops)
2956                 return -EOPNOTSUPP;
2957
2958         err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2959                                           tb[NFTA_EXPR_DATA],
2960                                           type->policy, NULL);
2961         if (err < 0)
2962                 goto err_nla_parse;
2963
2964         info->attr = nla;
2965         info->ops = type->inner_ops;
2966
2967         return 0;
2968
2969 err_nla_parse:
2970         return err;
2971 }
2972
2973 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2974                              const struct nft_expr_info *expr_info,
2975                              struct nft_expr *expr)
2976 {
2977         const struct nft_expr_ops *ops = expr_info->ops;
2978         int err;
2979
2980         expr->ops = ops;
2981         if (ops->init) {
2982                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2983                 if (err < 0)
2984                         goto err1;
2985         }
2986
2987         return 0;
2988 err1:
2989         expr->ops = NULL;
2990         return err;
2991 }
2992
2993 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2994                                    struct nft_expr *expr)
2995 {
2996         const struct nft_expr_type *type = expr->ops->type;
2997
2998         if (expr->ops->destroy)
2999                 expr->ops->destroy(ctx, expr);
3000         module_put(type->owner);
3001 }
3002
3003 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3004                                       const struct nlattr *nla)
3005 {
3006         struct nft_expr_info expr_info;
3007         struct nft_expr *expr;
3008         struct module *owner;
3009         int err;
3010
3011         err = nf_tables_expr_parse(ctx, nla, &expr_info);
3012         if (err < 0)
3013                 goto err_expr_parse;
3014
3015         err = -EOPNOTSUPP;
3016         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3017                 goto err_expr_stateful;
3018
3019         err = -ENOMEM;
3020         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3021         if (expr == NULL)
3022                 goto err_expr_stateful;
3023
3024         err = nf_tables_newexpr(ctx, &expr_info, expr);
3025         if (err < 0)
3026                 goto err_expr_new;
3027
3028         return expr;
3029 err_expr_new:
3030         kfree(expr);
3031 err_expr_stateful:
3032         owner = expr_info.ops->type->owner;
3033         if (expr_info.ops->type->release_ops)
3034                 expr_info.ops->type->release_ops(expr_info.ops);
3035
3036         module_put(owner);
3037 err_expr_parse:
3038         return ERR_PTR(err);
3039 }
3040
3041 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3042 {
3043         int err;
3044
3045         if (src->ops->clone) {
3046                 dst->ops = src->ops;
3047                 err = src->ops->clone(dst, src);
3048                 if (err < 0)
3049                         return err;
3050         } else {
3051                 memcpy(dst, src, src->ops->size);
3052         }
3053
3054         __module_get(src->ops->type->owner);
3055
3056         return 0;
3057 }
3058
3059 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3060 {
3061         nf_tables_expr_destroy(ctx, expr);
3062         kfree(expr);
3063 }
3064
3065 /*
3066  * Rules
3067  */
3068
3069 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3070                                           u64 handle)
3071 {
3072         struct nft_rule *rule;
3073
3074         // FIXME: this sucks
3075         list_for_each_entry_rcu(rule, &chain->rules, list) {
3076                 if (handle == rule->handle)
3077                         return rule;
3078         }
3079
3080         return ERR_PTR(-ENOENT);
3081 }
3082
3083 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3084                                         const struct nlattr *nla)
3085 {
3086         if (nla == NULL)
3087                 return ERR_PTR(-EINVAL);
3088
3089         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3090 }
3091
3092 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3093         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
3094                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
3095         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
3096                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
3097         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
3098         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3099         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
3100         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
3101         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
3102                                     .len = NFT_USERDATA_MAXLEN },
3103         [NFTA_RULE_ID]          = { .type = NLA_U32 },
3104         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3105         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
3106 };
3107
3108 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3109                                     u32 portid, u32 seq, int event,
3110                                     u32 flags, int family,
3111                                     const struct nft_table *table,
3112                                     const struct nft_chain *chain,
3113                                     const struct nft_rule *rule, u64 handle,
3114                                     bool reset)
3115 {
3116         struct nlmsghdr *nlh;
3117         const struct nft_expr *expr, *next;
3118         struct nlattr *list;
3119         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3120
3121         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3122                            nft_base_seq(net));
3123         if (!nlh)
3124                 goto nla_put_failure;
3125
3126         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3127                 goto nla_put_failure;
3128         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3129                 goto nla_put_failure;
3130         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3131                          NFTA_RULE_PAD))
3132                 goto nla_put_failure;
3133
3134         if (event != NFT_MSG_DELRULE && handle) {
3135                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3136                                  NFTA_RULE_PAD))
3137                         goto nla_put_failure;
3138         }
3139
3140         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3141                 nft_flow_rule_stats(chain, rule);
3142
3143         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3144         if (list == NULL)
3145                 goto nla_put_failure;
3146         nft_rule_for_each_expr(expr, next, rule) {
3147                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3148                         goto nla_put_failure;
3149         }
3150         nla_nest_end(skb, list);
3151
3152         if (rule->udata) {
3153                 struct nft_userdata *udata = nft_userdata(rule);
3154                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3155                             udata->data) < 0)
3156                         goto nla_put_failure;
3157         }
3158
3159         nlmsg_end(skb, nlh);
3160         return 0;
3161
3162 nla_put_failure:
3163         nlmsg_trim(skb, nlh);
3164         return -1;
3165 }
3166
3167 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3168                                   const struct nft_rule *rule, int event)
3169 {
3170         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3171         const struct nft_rule *prule;
3172         struct sk_buff *skb;
3173         u64 handle = 0;
3174         u16 flags = 0;
3175         int err;
3176
3177         if (!ctx->report &&
3178             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3179                 return;
3180
3181         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3182         if (skb == NULL)
3183                 goto err;
3184
3185         if (event == NFT_MSG_NEWRULE &&
3186             !list_is_first(&rule->list, &ctx->chain->rules) &&
3187             !list_is_last(&rule->list, &ctx->chain->rules)) {
3188                 prule = list_prev_entry(rule, list);
3189                 handle = prule->handle;
3190         }
3191         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3192                 flags |= NLM_F_APPEND;
3193         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3194                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3195
3196         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3197                                        event, flags, ctx->family, ctx->table,
3198                                        ctx->chain, rule, handle, false);
3199         if (err < 0) {
3200                 kfree_skb(skb);
3201                 goto err;
3202         }
3203
3204         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3205         return;
3206 err:
3207         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3208 }
3209
3210 struct nft_rule_dump_ctx {
3211         char *table;
3212         char *chain;
3213 };
3214
3215 static int __nf_tables_dump_rules(struct sk_buff *skb,
3216                                   unsigned int *idx,
3217                                   struct netlink_callback *cb,
3218                                   const struct nft_table *table,
3219                                   const struct nft_chain *chain,
3220                                   bool reset)
3221 {
3222         struct net *net = sock_net(skb->sk);
3223         const struct nft_rule *rule, *prule;
3224         unsigned int s_idx = cb->args[0];
3225         u64 handle;
3226
3227         prule = NULL;
3228         list_for_each_entry_rcu(rule, &chain->rules, list) {
3229                 if (!nft_is_active(net, rule))
3230                         goto cont_skip;
3231                 if (*idx < s_idx)
3232                         goto cont;
3233                 if (*idx > s_idx) {
3234                         memset(&cb->args[1], 0,
3235                                         sizeof(cb->args) - sizeof(cb->args[0]));
3236                 }
3237                 if (prule)
3238                         handle = prule->handle;
3239                 else
3240                         handle = 0;
3241
3242                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3243                                         cb->nlh->nlmsg_seq,
3244                                         NFT_MSG_NEWRULE,
3245                                         NLM_F_MULTI | NLM_F_APPEND,
3246                                         table->family,
3247                                         table, chain, rule, handle, reset) < 0)
3248                         return 1;
3249
3250                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3251 cont:
3252                 prule = rule;
3253 cont_skip:
3254                 (*idx)++;
3255         }
3256         return 0;
3257 }
3258
3259 static int nf_tables_dump_rules(struct sk_buff *skb,
3260                                 struct netlink_callback *cb)
3261 {
3262         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3263         const struct nft_rule_dump_ctx *ctx = cb->data;
3264         struct nft_table *table;
3265         const struct nft_chain *chain;
3266         unsigned int idx = 0;
3267         struct net *net = sock_net(skb->sk);
3268         int family = nfmsg->nfgen_family;
3269         struct nftables_pernet *nft_net;
3270         bool reset = false;
3271
3272         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3273                 reset = true;
3274
3275         rcu_read_lock();
3276         nft_net = nft_pernet(net);
3277         cb->seq = READ_ONCE(nft_net->base_seq);
3278
3279         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3280                 if (family != NFPROTO_UNSPEC && family != table->family)
3281                         continue;
3282
3283                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3284                         continue;
3285
3286                 if (ctx && ctx->table && ctx->chain) {
3287                         struct rhlist_head *list, *tmp;
3288
3289                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3290                                                nft_chain_ht_params);
3291                         if (!list)
3292                                 goto done;
3293
3294                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3295                                 if (!nft_is_active(net, chain))
3296                                         continue;
3297                                 __nf_tables_dump_rules(skb, &idx,
3298                                                        cb, table, chain, reset);
3299                                 break;
3300                         }
3301                         goto done;
3302                 }
3303
3304                 list_for_each_entry_rcu(chain, &table->chains, list) {
3305                         if (__nf_tables_dump_rules(skb, &idx,
3306                                                    cb, table, chain, reset))
3307                                 goto done;
3308                 }
3309
3310                 if (ctx && ctx->table)
3311                         break;
3312         }
3313 done:
3314         rcu_read_unlock();
3315
3316         cb->args[0] = idx;
3317         return skb->len;
3318 }
3319
3320 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3321 {
3322         const struct nlattr * const *nla = cb->data;
3323         struct nft_rule_dump_ctx *ctx = NULL;
3324
3325         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3326                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3327                 if (!ctx)
3328                         return -ENOMEM;
3329
3330                 if (nla[NFTA_RULE_TABLE]) {
3331                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3332                                                         GFP_ATOMIC);
3333                         if (!ctx->table) {
3334                                 kfree(ctx);
3335                                 return -ENOMEM;
3336                         }
3337                 }
3338                 if (nla[NFTA_RULE_CHAIN]) {
3339                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3340                                                 GFP_ATOMIC);
3341                         if (!ctx->chain) {
3342                                 kfree(ctx->table);
3343                                 kfree(ctx);
3344                                 return -ENOMEM;
3345                         }
3346                 }
3347         }
3348
3349         cb->data = ctx;
3350         return 0;
3351 }
3352
3353 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3354 {
3355         struct nft_rule_dump_ctx *ctx = cb->data;
3356
3357         if (ctx) {
3358                 kfree(ctx->table);
3359                 kfree(ctx->chain);
3360                 kfree(ctx);
3361         }
3362         return 0;
3363 }
3364
3365 /* called with rcu_read_lock held */
3366 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3367                              const struct nlattr * const nla[])
3368 {
3369         struct netlink_ext_ack *extack = info->extack;
3370         u8 genmask = nft_genmask_cur(info->net);
3371         u8 family = info->nfmsg->nfgen_family;
3372         const struct nft_chain *chain;
3373         const struct nft_rule *rule;
3374         struct net *net = info->net;
3375         struct nft_table *table;
3376         struct sk_buff *skb2;
3377         bool reset = false;
3378         int err;
3379
3380         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3381                 struct netlink_dump_control c = {
3382                         .start= nf_tables_dump_rules_start,
3383                         .dump = nf_tables_dump_rules,
3384                         .done = nf_tables_dump_rules_done,
3385                         .module = THIS_MODULE,
3386                         .data = (void *)nla,
3387                 };
3388
3389                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3390         }
3391
3392         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3393         if (IS_ERR(table)) {
3394                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3395                 return PTR_ERR(table);
3396         }
3397
3398         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3399         if (IS_ERR(chain)) {
3400                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3401                 return PTR_ERR(chain);
3402         }
3403
3404         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3405         if (IS_ERR(rule)) {
3406                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3407                 return PTR_ERR(rule);
3408         }
3409
3410         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3411         if (!skb2)
3412                 return -ENOMEM;
3413
3414         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3415                 reset = true;
3416
3417         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3418                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3419                                        family, table, chain, rule, 0, reset);
3420         if (err < 0)
3421                 goto err_fill_rule_info;
3422
3423         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3424
3425 err_fill_rule_info:
3426         kfree_skb(skb2);
3427         return err;
3428 }
3429
3430 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3431                                    struct nft_rule *rule)
3432 {
3433         struct nft_expr *expr, *next;
3434
3435         /*
3436          * Careful: some expressions might not be initialized in case this
3437          * is called on error from nf_tables_newrule().
3438          */
3439         expr = nft_expr_first(rule);
3440         while (nft_expr_more(rule, expr)) {
3441                 next = nft_expr_next(expr);
3442                 nf_tables_expr_destroy(ctx, expr);
3443                 expr = next;
3444         }
3445         kfree(rule);
3446 }
3447
3448 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3449 {
3450         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3451         nf_tables_rule_destroy(ctx, rule);
3452 }
3453
3454 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3455 {
3456         struct nft_expr *expr, *last;
3457         const struct nft_data *data;
3458         struct nft_rule *rule;
3459         int err;
3460
3461         if (ctx->level == NFT_JUMP_STACK_SIZE)
3462                 return -EMLINK;
3463
3464         list_for_each_entry(rule, &chain->rules, list) {
3465                 if (!nft_is_active_next(ctx->net, rule))
3466                         continue;
3467
3468                 nft_rule_for_each_expr(expr, last, rule) {
3469                         if (!expr->ops->validate)
3470                                 continue;
3471
3472                         err = expr->ops->validate(ctx, expr, &data);
3473                         if (err < 0)
3474                                 return err;
3475                 }
3476
3477                 cond_resched();
3478         }
3479
3480         return 0;
3481 }
3482 EXPORT_SYMBOL_GPL(nft_chain_validate);
3483
3484 static int nft_table_validate(struct net *net, const struct nft_table *table)
3485 {
3486         struct nft_chain *chain;
3487         struct nft_ctx ctx = {
3488                 .net    = net,
3489                 .family = table->family,
3490         };
3491         int err;
3492
3493         list_for_each_entry(chain, &table->chains, list) {
3494                 if (!nft_is_base_chain(chain))
3495                         continue;
3496
3497                 ctx.chain = chain;
3498                 err = nft_chain_validate(&ctx, chain);
3499                 if (err < 0)
3500                         return err;
3501         }
3502
3503         return 0;
3504 }
3505
3506 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3507                          const struct nft_set_iter *iter,
3508                          struct nft_set_elem *elem)
3509 {
3510         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3511         struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3512         const struct nft_data *data;
3513         int err;
3514
3515         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3516             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3517                 return 0;
3518
3519         data = nft_set_ext_data(ext);
3520         switch (data->verdict.code) {
3521         case NFT_JUMP:
3522         case NFT_GOTO:
3523                 pctx->level++;
3524                 err = nft_chain_validate(ctx, data->verdict.chain);
3525                 if (err < 0)
3526                         return err;
3527                 pctx->level--;
3528                 break;
3529         default:
3530                 break;
3531         }
3532
3533         return 0;
3534 }
3535
3536 struct nft_set_elem_catchall {
3537         struct list_head        list;
3538         struct rcu_head         rcu;
3539         void                    *elem;
3540 };
3541
3542 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3543 {
3544         u8 genmask = nft_genmask_next(ctx->net);
3545         struct nft_set_elem_catchall *catchall;
3546         struct nft_set_elem elem;
3547         struct nft_set_ext *ext;
3548         int ret = 0;
3549
3550         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3551                 ext = nft_set_elem_ext(set, catchall->elem);
3552                 if (!nft_set_elem_active(ext, genmask))
3553                         continue;
3554
3555                 elem.priv = catchall->elem;
3556                 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3557                 if (ret < 0)
3558                         return ret;
3559         }
3560
3561         return ret;
3562 }
3563
3564 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3565                                              const struct nft_chain *chain,
3566                                              const struct nlattr *nla);
3567
3568 #define NFT_RULE_MAXEXPRS       128
3569
3570 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3571                              const struct nlattr * const nla[])
3572 {
3573         struct nftables_pernet *nft_net = nft_pernet(info->net);
3574         struct netlink_ext_ack *extack = info->extack;
3575         unsigned int size, i, n, ulen = 0, usize = 0;
3576         u8 genmask = nft_genmask_next(info->net);
3577         struct nft_rule *rule, *old_rule = NULL;
3578         struct nft_expr_info *expr_info = NULL;
3579         u8 family = info->nfmsg->nfgen_family;
3580         struct nft_flow_rule *flow = NULL;
3581         struct net *net = info->net;
3582         struct nft_userdata *udata;
3583         struct nft_table *table;
3584         struct nft_chain *chain;
3585         struct nft_trans *trans;
3586         u64 handle, pos_handle;
3587         struct nft_expr *expr;
3588         struct nft_ctx ctx;
3589         struct nlattr *tmp;
3590         int err, rem;
3591
3592         lockdep_assert_held(&nft_net->commit_mutex);
3593
3594         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3595                                  NETLINK_CB(skb).portid);
3596         if (IS_ERR(table)) {
3597                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3598                 return PTR_ERR(table);
3599         }
3600
3601         if (nla[NFTA_RULE_CHAIN]) {
3602                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3603                                          genmask);
3604                 if (IS_ERR(chain)) {
3605                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3606                         return PTR_ERR(chain);
3607                 }
3608                 if (nft_chain_is_bound(chain))
3609                         return -EOPNOTSUPP;
3610
3611         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3612                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
3613                 if (IS_ERR(chain)) {
3614                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3615                         return PTR_ERR(chain);
3616                 }
3617         } else {
3618                 return -EINVAL;
3619         }
3620
3621         if (nla[NFTA_RULE_HANDLE]) {
3622                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3623                 rule = __nft_rule_lookup(chain, handle);
3624                 if (IS_ERR(rule)) {
3625                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3626                         return PTR_ERR(rule);
3627                 }
3628
3629                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3630                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3631                         return -EEXIST;
3632                 }
3633                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3634                         old_rule = rule;
3635                 else
3636                         return -EOPNOTSUPP;
3637         } else {
3638                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3639                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3640                         return -EINVAL;
3641                 handle = nf_tables_alloc_handle(table);
3642
3643                 if (chain->use == UINT_MAX)
3644                         return -EOVERFLOW;
3645
3646                 if (nla[NFTA_RULE_POSITION]) {
3647                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3648                         old_rule = __nft_rule_lookup(chain, pos_handle);
3649                         if (IS_ERR(old_rule)) {
3650                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3651                                 return PTR_ERR(old_rule);
3652                         }
3653                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3654                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3655                         if (IS_ERR(old_rule)) {
3656                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3657                                 return PTR_ERR(old_rule);
3658                         }
3659                 }
3660         }
3661
3662         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3663
3664         n = 0;
3665         size = 0;
3666         if (nla[NFTA_RULE_EXPRESSIONS]) {
3667                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3668                                            sizeof(struct nft_expr_info),
3669                                            GFP_KERNEL);
3670                 if (!expr_info)
3671                         return -ENOMEM;
3672
3673                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3674                         err = -EINVAL;
3675                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3676                                 goto err_release_expr;
3677                         if (n == NFT_RULE_MAXEXPRS)
3678                                 goto err_release_expr;
3679                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3680                         if (err < 0) {
3681                                 NL_SET_BAD_ATTR(extack, tmp);
3682                                 goto err_release_expr;
3683                         }
3684                         size += expr_info[n].ops->size;
3685                         n++;
3686                 }
3687         }
3688         /* Check for overflow of dlen field */
3689         err = -EFBIG;
3690         if (size >= 1 << 12)
3691                 goto err_release_expr;
3692
3693         if (nla[NFTA_RULE_USERDATA]) {
3694                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3695                 if (ulen > 0)
3696                         usize = sizeof(struct nft_userdata) + ulen;
3697         }
3698
3699         err = -ENOMEM;
3700         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3701         if (rule == NULL)
3702                 goto err_release_expr;
3703
3704         nft_activate_next(net, rule);
3705
3706         rule->handle = handle;
3707         rule->dlen   = size;
3708         rule->udata  = ulen ? 1 : 0;
3709
3710         if (ulen) {
3711                 udata = nft_userdata(rule);
3712                 udata->len = ulen - 1;
3713                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3714         }
3715
3716         expr = nft_expr_first(rule);
3717         for (i = 0; i < n; i++) {
3718                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3719                 if (err < 0) {
3720                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3721                         goto err_release_rule;
3722                 }
3723
3724                 if (expr_info[i].ops->validate)
3725                         nft_validate_state_update(table, NFT_VALIDATE_NEED);
3726
3727                 expr_info[i].ops = NULL;
3728                 expr = nft_expr_next(expr);
3729         }
3730
3731         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3732                 flow = nft_flow_rule_create(net, rule);
3733                 if (IS_ERR(flow)) {
3734                         err = PTR_ERR(flow);
3735                         goto err_release_rule;
3736                 }
3737         }
3738
3739         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3740                 err = nft_delrule(&ctx, old_rule);
3741                 if (err < 0)
3742                         goto err_destroy_flow_rule;
3743
3744                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3745                 if (trans == NULL) {
3746                         err = -ENOMEM;
3747                         goto err_destroy_flow_rule;
3748                 }
3749                 list_add_tail_rcu(&rule->list, &old_rule->list);
3750         } else {
3751                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3752                 if (!trans) {
3753                         err = -ENOMEM;
3754                         goto err_destroy_flow_rule;
3755                 }
3756
3757                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3758                         if (old_rule)
3759                                 list_add_rcu(&rule->list, &old_rule->list);
3760                         else
3761                                 list_add_tail_rcu(&rule->list, &chain->rules);
3762                  } else {
3763                         if (old_rule)
3764                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3765                         else
3766                                 list_add_rcu(&rule->list, &chain->rules);
3767                 }
3768         }
3769         kvfree(expr_info);
3770         chain->use++;
3771
3772         if (flow)
3773                 nft_trans_flow_rule(trans) = flow;
3774
3775         if (table->validate_state == NFT_VALIDATE_DO)
3776                 return nft_table_validate(net, table);
3777
3778         return 0;
3779
3780 err_destroy_flow_rule:
3781         if (flow)
3782                 nft_flow_rule_destroy(flow);
3783 err_release_rule:
3784         nf_tables_rule_release(&ctx, rule);
3785 err_release_expr:
3786         for (i = 0; i < n; i++) {
3787                 if (expr_info[i].ops) {
3788                         module_put(expr_info[i].ops->type->owner);
3789                         if (expr_info[i].ops->type->release_ops)
3790                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3791                 }
3792         }
3793         kvfree(expr_info);
3794
3795         return err;
3796 }
3797
3798 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3799                                              const struct nft_chain *chain,
3800                                              const struct nlattr *nla)
3801 {
3802         struct nftables_pernet *nft_net = nft_pernet(net);
3803         u32 id = ntohl(nla_get_be32(nla));
3804         struct nft_trans *trans;
3805
3806         list_for_each_entry(trans, &nft_net->commit_list, list) {
3807                 struct nft_rule *rule = nft_trans_rule(trans);
3808
3809                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3810                     trans->ctx.chain == chain &&
3811                     id == nft_trans_rule_id(trans))
3812                         return rule;
3813         }
3814         return ERR_PTR(-ENOENT);
3815 }
3816
3817 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3818                              const struct nlattr * const nla[])
3819 {
3820         struct netlink_ext_ack *extack = info->extack;
3821         u8 genmask = nft_genmask_next(info->net);
3822         u8 family = info->nfmsg->nfgen_family;
3823         struct nft_chain *chain = NULL;
3824         struct net *net = info->net;
3825         struct nft_table *table;
3826         struct nft_rule *rule;
3827         struct nft_ctx ctx;
3828         int err = 0;
3829
3830         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3831                                  NETLINK_CB(skb).portid);
3832         if (IS_ERR(table)) {
3833                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3834                 return PTR_ERR(table);
3835         }
3836
3837         if (nla[NFTA_RULE_CHAIN]) {
3838                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3839                                          genmask);
3840                 if (IS_ERR(chain)) {
3841                         if (PTR_ERR(chain) == -ENOENT &&
3842                             NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
3843                                 return 0;
3844
3845                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3846                         return PTR_ERR(chain);
3847                 }
3848                 if (nft_chain_is_bound(chain))
3849                         return -EOPNOTSUPP;
3850         }
3851
3852         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3853
3854         if (chain) {
3855                 if (nla[NFTA_RULE_HANDLE]) {
3856                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3857                         if (IS_ERR(rule)) {
3858                                 if (PTR_ERR(rule) == -ENOENT &&
3859                                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
3860                                         return 0;
3861
3862                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3863                                 return PTR_ERR(rule);
3864                         }
3865
3866                         err = nft_delrule(&ctx, rule);
3867                 } else if (nla[NFTA_RULE_ID]) {
3868                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
3869                         if (IS_ERR(rule)) {
3870                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3871                                 return PTR_ERR(rule);
3872                         }
3873
3874                         err = nft_delrule(&ctx, rule);
3875                 } else {
3876                         err = nft_delrule_by_chain(&ctx);
3877                 }
3878         } else {
3879                 list_for_each_entry(chain, &table->chains, list) {
3880                         if (!nft_is_active_next(net, chain))
3881                                 continue;
3882
3883                         ctx.chain = chain;
3884                         err = nft_delrule_by_chain(&ctx);
3885                         if (err < 0)
3886                                 break;
3887                 }
3888         }
3889
3890         return err;
3891 }
3892
3893 /*
3894  * Sets
3895  */
3896 static const struct nft_set_type *nft_set_types[] = {
3897         &nft_set_hash_fast_type,
3898         &nft_set_hash_type,
3899         &nft_set_rhash_type,
3900         &nft_set_bitmap_type,
3901         &nft_set_rbtree_type,
3902 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3903         &nft_set_pipapo_avx2_type,
3904 #endif
3905         &nft_set_pipapo_type,
3906 };
3907
3908 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3909                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3910                                  NFT_SET_EVAL)
3911
3912 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3913 {
3914         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3915 }
3916
3917 /*
3918  * Select a set implementation based on the data characteristics and the
3919  * given policy. The total memory use might not be known if no size is
3920  * given, in that case the amount of memory per element is used.
3921  */
3922 static const struct nft_set_ops *
3923 nft_select_set_ops(const struct nft_ctx *ctx,
3924                    const struct nlattr * const nla[],
3925                    const struct nft_set_desc *desc)
3926 {
3927         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3928         const struct nft_set_ops *ops, *bops;
3929         struct nft_set_estimate est, best;
3930         const struct nft_set_type *type;
3931         u32 flags = 0;
3932         int i;
3933
3934         lockdep_assert_held(&nft_net->commit_mutex);
3935         lockdep_nfnl_nft_mutex_not_held();
3936
3937         if (nla[NFTA_SET_FLAGS] != NULL)
3938                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3939
3940         bops        = NULL;
3941         best.size   = ~0;
3942         best.lookup = ~0;
3943         best.space  = ~0;
3944
3945         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3946                 type = nft_set_types[i];
3947                 ops = &type->ops;
3948
3949                 if (!nft_set_ops_candidate(type, flags))
3950                         continue;
3951                 if (!ops->estimate(desc, flags, &est))
3952                         continue;
3953
3954                 switch (desc->policy) {
3955                 case NFT_SET_POL_PERFORMANCE:
3956                         if (est.lookup < best.lookup)
3957                                 break;
3958                         if (est.lookup == best.lookup &&
3959                             est.space < best.space)
3960                                 break;
3961                         continue;
3962                 case NFT_SET_POL_MEMORY:
3963                         if (!desc->size) {
3964                                 if (est.space < best.space)
3965                                         break;
3966                                 if (est.space == best.space &&
3967                                     est.lookup < best.lookup)
3968                                         break;
3969                         } else if (est.size < best.size || !bops) {
3970                                 break;
3971                         }
3972                         continue;
3973                 default:
3974                         break;
3975                 }
3976
3977                 bops = ops;
3978                 best = est;
3979         }
3980
3981         if (bops != NULL)
3982                 return bops;
3983
3984         return ERR_PTR(-EOPNOTSUPP);
3985 }
3986
3987 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3988         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3989                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3990         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3991                                             .len = NFT_SET_MAXNAMELEN - 1 },
3992         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3993         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3994         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3995         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3996         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3997         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3998         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3999         [NFTA_SET_ID]                   = { .type = NLA_U32 },
4000         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
4001         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
4002         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
4003                                             .len  = NFT_USERDATA_MAXLEN },
4004         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
4005         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
4006         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
4007         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
4008 };
4009
4010 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4011         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
4012         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
4013 };
4014
4015 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4016                                       const struct nlattr *nla, u8 genmask)
4017 {
4018         struct nft_set *set;
4019
4020         if (nla == NULL)
4021                 return ERR_PTR(-EINVAL);
4022
4023         list_for_each_entry_rcu(set, &table->sets, list) {
4024                 if (!nla_strcmp(nla, set->name) &&
4025                     nft_active_genmask(set, genmask))
4026                         return set;
4027         }
4028         return ERR_PTR(-ENOENT);
4029 }
4030
4031 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4032                                                const struct nlattr *nla,
4033                                                u8 genmask)
4034 {
4035         struct nft_set *set;
4036
4037         list_for_each_entry(set, &table->sets, list) {
4038                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4039                     nft_active_genmask(set, genmask))
4040                         return set;
4041         }
4042         return ERR_PTR(-ENOENT);
4043 }
4044
4045 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4046                                            const struct nft_table *table,
4047                                            const struct nlattr *nla, u8 genmask)
4048 {
4049         struct nftables_pernet *nft_net = nft_pernet(net);
4050         u32 id = ntohl(nla_get_be32(nla));
4051         struct nft_trans *trans;
4052
4053         list_for_each_entry(trans, &nft_net->commit_list, list) {
4054                 if (trans->msg_type == NFT_MSG_NEWSET) {
4055                         struct nft_set *set = nft_trans_set(trans);
4056
4057                         if (id == nft_trans_set_id(trans) &&
4058                             set->table == table &&
4059                             nft_active_genmask(set, genmask))
4060                                 return set;
4061                 }
4062         }
4063         return ERR_PTR(-ENOENT);
4064 }
4065
4066 struct nft_set *nft_set_lookup_global(const struct net *net,
4067                                       const struct nft_table *table,
4068                                       const struct nlattr *nla_set_name,
4069                                       const struct nlattr *nla_set_id,
4070                                       u8 genmask)
4071 {
4072         struct nft_set *set;
4073
4074         set = nft_set_lookup(table, nla_set_name, genmask);
4075         if (IS_ERR(set)) {
4076                 if (!nla_set_id)
4077                         return set;
4078
4079                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4080         }
4081         return set;
4082 }
4083 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4084
4085 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4086                                     const char *name)
4087 {
4088         const struct nft_set *i;
4089         const char *p;
4090         unsigned long *inuse;
4091         unsigned int n = 0, min = 0;
4092
4093         p = strchr(name, '%');
4094         if (p != NULL) {
4095                 if (p[1] != 'd' || strchr(p + 2, '%'))
4096                         return -EINVAL;
4097
4098                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4099                 if (inuse == NULL)
4100                         return -ENOMEM;
4101 cont:
4102                 list_for_each_entry(i, &ctx->table->sets, list) {
4103                         int tmp;
4104
4105                         if (!nft_is_active_next(ctx->net, i))
4106                                 continue;
4107                         if (!sscanf(i->name, name, &tmp))
4108                                 continue;
4109                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4110                                 continue;
4111
4112                         set_bit(tmp - min, inuse);
4113                 }
4114
4115                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4116                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4117                         min += BITS_PER_BYTE * PAGE_SIZE;
4118                         memset(inuse, 0, PAGE_SIZE);
4119                         goto cont;
4120                 }
4121                 free_page((unsigned long)inuse);
4122         }
4123
4124         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4125         if (!set->name)
4126                 return -ENOMEM;
4127
4128         list_for_each_entry(i, &ctx->table->sets, list) {
4129                 if (!nft_is_active_next(ctx->net, i))
4130                         continue;
4131                 if (!strcmp(set->name, i->name)) {
4132                         kfree(set->name);
4133                         set->name = NULL;
4134                         return -ENFILE;
4135                 }
4136         }
4137         return 0;
4138 }
4139
4140 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4141 {
4142         u64 ms = be64_to_cpu(nla_get_be64(nla));
4143         u64 max = (u64)(~((u64)0));
4144
4145         max = div_u64(max, NSEC_PER_MSEC);
4146         if (ms >= max)
4147                 return -ERANGE;
4148
4149         ms *= NSEC_PER_MSEC;
4150         *result = nsecs_to_jiffies64(ms);
4151         return 0;
4152 }
4153
4154 __be64 nf_jiffies64_to_msecs(u64 input)
4155 {
4156         return cpu_to_be64(jiffies64_to_msecs(input));
4157 }
4158
4159 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4160                                      const struct nft_set *set)
4161 {
4162         struct nlattr *concat, *field;
4163         int i;
4164
4165         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4166         if (!concat)
4167                 return -ENOMEM;
4168
4169         for (i = 0; i < set->field_count; i++) {
4170                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4171                 if (!field)
4172                         return -ENOMEM;
4173
4174                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4175                                  htonl(set->field_len[i])))
4176                         return -ENOMEM;
4177
4178                 nla_nest_end(skb, field);
4179         }
4180
4181         nla_nest_end(skb, concat);
4182
4183         return 0;
4184 }
4185
4186 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4187                               const struct nft_set *set, u16 event, u16 flags)
4188 {
4189         u64 timeout = READ_ONCE(set->timeout);
4190         u32 gc_int = READ_ONCE(set->gc_int);
4191         u32 portid = ctx->portid;
4192         struct nlmsghdr *nlh;
4193         struct nlattr *nest;
4194         u32 seq = ctx->seq;
4195         int i;
4196
4197         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4198         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4199                            NFNETLINK_V0, nft_base_seq(ctx->net));
4200         if (!nlh)
4201                 goto nla_put_failure;
4202
4203         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4204                 goto nla_put_failure;
4205         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4206                 goto nla_put_failure;
4207         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4208                          NFTA_SET_PAD))
4209                 goto nla_put_failure;
4210
4211         if (event == NFT_MSG_DELSET) {
4212                 nlmsg_end(skb, nlh);
4213                 return 0;
4214         }
4215
4216         if (set->flags != 0)
4217                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4218                         goto nla_put_failure;
4219
4220         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4221                 goto nla_put_failure;
4222         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4223                 goto nla_put_failure;
4224         if (set->flags & NFT_SET_MAP) {
4225                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4226                         goto nla_put_failure;
4227                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4228                         goto nla_put_failure;
4229         }
4230         if (set->flags & NFT_SET_OBJECT &&
4231             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4232                 goto nla_put_failure;
4233
4234         if (timeout &&
4235             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4236                          nf_jiffies64_to_msecs(timeout),
4237                          NFTA_SET_PAD))
4238                 goto nla_put_failure;
4239         if (gc_int &&
4240             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4241                 goto nla_put_failure;
4242
4243         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4244                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4245                         goto nla_put_failure;
4246         }
4247
4248         if (set->udata &&
4249             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4250                 goto nla_put_failure;
4251
4252         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4253         if (!nest)
4254                 goto nla_put_failure;
4255         if (set->size &&
4256             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4257                 goto nla_put_failure;
4258
4259         if (set->field_count > 1 &&
4260             nf_tables_fill_set_concat(skb, set))
4261                 goto nla_put_failure;
4262
4263         nla_nest_end(skb, nest);
4264
4265         if (set->num_exprs == 1) {
4266                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4267                 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4268                         goto nla_put_failure;
4269
4270                 nla_nest_end(skb, nest);
4271         } else if (set->num_exprs > 1) {
4272                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4273                 if (nest == NULL)
4274                         goto nla_put_failure;
4275
4276                 for (i = 0; i < set->num_exprs; i++) {
4277                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4278                                           set->exprs[i], false) < 0)
4279                                 goto nla_put_failure;
4280                 }
4281                 nla_nest_end(skb, nest);
4282         }
4283
4284         nlmsg_end(skb, nlh);
4285         return 0;
4286
4287 nla_put_failure:
4288         nlmsg_trim(skb, nlh);
4289         return -1;
4290 }
4291
4292 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4293                                  const struct nft_set *set, int event,
4294                                  gfp_t gfp_flags)
4295 {
4296         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4297         u32 portid = ctx->portid;
4298         struct sk_buff *skb;
4299         u16 flags = 0;
4300         int err;
4301
4302         if (!ctx->report &&
4303             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4304                 return;
4305
4306         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4307         if (skb == NULL)
4308                 goto err;
4309
4310         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4311                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4312
4313         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4314         if (err < 0) {
4315                 kfree_skb(skb);
4316                 goto err;
4317         }
4318
4319         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4320         return;
4321 err:
4322         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4323 }
4324
4325 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4326 {
4327         const struct nft_set *set;
4328         unsigned int idx, s_idx = cb->args[0];
4329         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4330         struct net *net = sock_net(skb->sk);
4331         struct nft_ctx *ctx = cb->data, ctx_set;
4332         struct nftables_pernet *nft_net;
4333
4334         if (cb->args[1])
4335                 return skb->len;
4336
4337         rcu_read_lock();
4338         nft_net = nft_pernet(net);
4339         cb->seq = READ_ONCE(nft_net->base_seq);
4340
4341         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4342                 if (ctx->family != NFPROTO_UNSPEC &&
4343                     ctx->family != table->family)
4344                         continue;
4345
4346                 if (ctx->table && ctx->table != table)
4347                         continue;
4348
4349                 if (cur_table) {
4350                         if (cur_table != table)
4351                                 continue;
4352
4353                         cur_table = NULL;
4354                 }
4355                 idx = 0;
4356                 list_for_each_entry_rcu(set, &table->sets, list) {
4357                         if (idx < s_idx)
4358                                 goto cont;
4359                         if (!nft_is_active(net, set))
4360                                 goto cont;
4361
4362                         ctx_set = *ctx;
4363                         ctx_set.table = table;
4364                         ctx_set.family = table->family;
4365
4366                         if (nf_tables_fill_set(skb, &ctx_set, set,
4367                                                NFT_MSG_NEWSET,
4368                                                NLM_F_MULTI) < 0) {
4369                                 cb->args[0] = idx;
4370                                 cb->args[2] = (unsigned long) table;
4371                                 goto done;
4372                         }
4373                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4374 cont:
4375                         idx++;
4376                 }
4377                 if (s_idx)
4378                         s_idx = 0;
4379         }
4380         cb->args[1] = 1;
4381 done:
4382         rcu_read_unlock();
4383         return skb->len;
4384 }
4385
4386 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4387 {
4388         struct nft_ctx *ctx_dump = NULL;
4389
4390         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4391         if (ctx_dump == NULL)
4392                 return -ENOMEM;
4393
4394         cb->data = ctx_dump;
4395         return 0;
4396 }
4397
4398 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4399 {
4400         kfree(cb->data);
4401         return 0;
4402 }
4403
4404 /* called with rcu_read_lock held */
4405 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4406                             const struct nlattr * const nla[])
4407 {
4408         struct netlink_ext_ack *extack = info->extack;
4409         u8 genmask = nft_genmask_cur(info->net);
4410         u8 family = info->nfmsg->nfgen_family;
4411         struct nft_table *table = NULL;
4412         struct net *net = info->net;
4413         const struct nft_set *set;
4414         struct sk_buff *skb2;
4415         struct nft_ctx ctx;
4416         int err;
4417
4418         if (nla[NFTA_SET_TABLE]) {
4419                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4420                                          genmask, 0);
4421                 if (IS_ERR(table)) {
4422                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4423                         return PTR_ERR(table);
4424                 }
4425         }
4426
4427         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4428
4429         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4430                 struct netlink_dump_control c = {
4431                         .start = nf_tables_dump_sets_start,
4432                         .dump = nf_tables_dump_sets,
4433                         .done = nf_tables_dump_sets_done,
4434                         .data = &ctx,
4435                         .module = THIS_MODULE,
4436                 };
4437
4438                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4439         }
4440
4441         /* Only accept unspec with dump */
4442         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4443                 return -EAFNOSUPPORT;
4444         if (!nla[NFTA_SET_TABLE])
4445                 return -EINVAL;
4446
4447         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4448         if (IS_ERR(set))
4449                 return PTR_ERR(set);
4450
4451         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4452         if (skb2 == NULL)
4453                 return -ENOMEM;
4454
4455         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4456         if (err < 0)
4457                 goto err_fill_set_info;
4458
4459         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4460
4461 err_fill_set_info:
4462         kfree_skb(skb2);
4463         return err;
4464 }
4465
4466 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4467         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4468 };
4469
4470 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4471                                      struct nft_set_desc *desc)
4472 {
4473         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4474         u32 len;
4475         int err;
4476
4477         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4478                 return -E2BIG;
4479
4480         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4481                                           nft_concat_policy, NULL);
4482         if (err < 0)
4483                 return err;
4484
4485         if (!tb[NFTA_SET_FIELD_LEN])
4486                 return -EINVAL;
4487
4488         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4489         if (!len || len > U8_MAX)
4490                 return -EINVAL;
4491
4492         desc->field_len[desc->field_count++] = len;
4493
4494         return 0;
4495 }
4496
4497 static int nft_set_desc_concat(struct nft_set_desc *desc,
4498                                const struct nlattr *nla)
4499 {
4500         struct nlattr *attr;
4501         u32 num_regs = 0;
4502         int rem, err, i;
4503
4504         nla_for_each_nested(attr, nla, rem) {
4505                 if (nla_type(attr) != NFTA_LIST_ELEM)
4506                         return -EINVAL;
4507
4508                 err = nft_set_desc_concat_parse(attr, desc);
4509                 if (err < 0)
4510                         return err;
4511         }
4512
4513         for (i = 0; i < desc->field_count; i++)
4514                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4515
4516         if (num_regs > NFT_REG32_COUNT)
4517                 return -E2BIG;
4518
4519         return 0;
4520 }
4521
4522 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4523                                     const struct nlattr *nla)
4524 {
4525         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4526         int err;
4527
4528         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4529                                           nft_set_desc_policy, NULL);
4530         if (err < 0)
4531                 return err;
4532
4533         if (da[NFTA_SET_DESC_SIZE] != NULL)
4534                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4535         if (da[NFTA_SET_DESC_CONCAT])
4536                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4537
4538         return err;
4539 }
4540
4541 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4542                               const struct nlattr * const *nla,
4543                               struct nft_expr **exprs, int *num_exprs,
4544                               u32 flags)
4545 {
4546         struct nft_expr *expr;
4547         int err, i;
4548
4549         if (nla[NFTA_SET_EXPR]) {
4550                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4551                 if (IS_ERR(expr)) {
4552                         err = PTR_ERR(expr);
4553                         goto err_set_expr_alloc;
4554                 }
4555                 exprs[0] = expr;
4556                 (*num_exprs)++;
4557         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4558                 struct nlattr *tmp;
4559                 int left;
4560
4561                 if (!(flags & NFT_SET_EXPR)) {
4562                         err = -EINVAL;
4563                         goto err_set_expr_alloc;
4564                 }
4565                 i = 0;
4566                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4567                         if (i == NFT_SET_EXPR_MAX) {
4568                                 err = -E2BIG;
4569                                 goto err_set_expr_alloc;
4570                         }
4571                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4572                                 err = -EINVAL;
4573                                 goto err_set_expr_alloc;
4574                         }
4575                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4576                         if (IS_ERR(expr)) {
4577                                 err = PTR_ERR(expr);
4578                                 goto err_set_expr_alloc;
4579                         }
4580                         exprs[i++] = expr;
4581                         (*num_exprs)++;
4582                 }
4583         }
4584
4585         return 0;
4586
4587 err_set_expr_alloc:
4588         for (i = 0; i < *num_exprs; i++)
4589                 nft_expr_destroy(ctx, exprs[i]);
4590
4591         return err;
4592 }
4593
4594 static bool nft_set_is_same(const struct nft_set *set,
4595                             const struct nft_set_desc *desc,
4596                             struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4597 {
4598         int i;
4599
4600         if (set->ktype != desc->ktype ||
4601             set->dtype != desc->dtype ||
4602             set->flags != flags ||
4603             set->klen != desc->klen ||
4604             set->dlen != desc->dlen ||
4605             set->field_count != desc->field_count ||
4606             set->num_exprs != num_exprs)
4607                 return false;
4608
4609         for (i = 0; i < desc->field_count; i++) {
4610                 if (set->field_len[i] != desc->field_len[i])
4611                         return false;
4612         }
4613
4614         for (i = 0; i < num_exprs; i++) {
4615                 if (set->exprs[i]->ops != exprs[i]->ops)
4616                         return false;
4617         }
4618
4619         return true;
4620 }
4621
4622 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4623                             const struct nlattr * const nla[])
4624 {
4625         struct netlink_ext_ack *extack = info->extack;
4626         u8 genmask = nft_genmask_next(info->net);
4627         u8 family = info->nfmsg->nfgen_family;
4628         const struct nft_set_ops *ops;
4629         struct net *net = info->net;
4630         struct nft_set_desc desc;
4631         struct nft_table *table;
4632         unsigned char *udata;
4633         struct nft_set *set;
4634         struct nft_ctx ctx;
4635         size_t alloc_size;
4636         int num_exprs = 0;
4637         char *name;
4638         int err, i;
4639         u16 udlen;
4640         u32 flags;
4641         u64 size;
4642
4643         if (nla[NFTA_SET_TABLE] == NULL ||
4644             nla[NFTA_SET_NAME] == NULL ||
4645             nla[NFTA_SET_KEY_LEN] == NULL ||
4646             nla[NFTA_SET_ID] == NULL)
4647                 return -EINVAL;
4648
4649         memset(&desc, 0, sizeof(desc));
4650
4651         desc.ktype = NFT_DATA_VALUE;
4652         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4653                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4654                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4655                         return -EINVAL;
4656         }
4657
4658         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4659         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4660                 return -EINVAL;
4661
4662         flags = 0;
4663         if (nla[NFTA_SET_FLAGS] != NULL) {
4664                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4665                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4666                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4667                               NFT_SET_MAP | NFT_SET_EVAL |
4668                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4669                         return -EOPNOTSUPP;
4670                 /* Only one of these operations is supported */
4671                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4672                              (NFT_SET_MAP | NFT_SET_OBJECT))
4673                         return -EOPNOTSUPP;
4674                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4675                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4676                         return -EOPNOTSUPP;
4677         }
4678
4679         desc.dtype = 0;
4680         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4681                 if (!(flags & NFT_SET_MAP))
4682                         return -EINVAL;
4683
4684                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4685                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4686                     desc.dtype != NFT_DATA_VERDICT)
4687                         return -EINVAL;
4688
4689                 if (desc.dtype != NFT_DATA_VERDICT) {
4690                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4691                                 return -EINVAL;
4692                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4693                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4694                                 return -EINVAL;
4695                 } else
4696                         desc.dlen = sizeof(struct nft_verdict);
4697         } else if (flags & NFT_SET_MAP)
4698                 return -EINVAL;
4699
4700         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4701                 if (!(flags & NFT_SET_OBJECT))
4702                         return -EINVAL;
4703
4704                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4705                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4706                     desc.objtype > NFT_OBJECT_MAX)
4707                         return -EOPNOTSUPP;
4708         } else if (flags & NFT_SET_OBJECT)
4709                 return -EINVAL;
4710         else
4711                 desc.objtype = NFT_OBJECT_UNSPEC;
4712
4713         desc.timeout = 0;
4714         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4715                 if (!(flags & NFT_SET_TIMEOUT))
4716                         return -EINVAL;
4717
4718                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4719                 if (err)
4720                         return err;
4721         }
4722         desc.gc_int = 0;
4723         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4724                 if (!(flags & NFT_SET_TIMEOUT))
4725                         return -EINVAL;
4726                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4727         }
4728
4729         desc.policy = NFT_SET_POL_PERFORMANCE;
4730         if (nla[NFTA_SET_POLICY] != NULL)
4731                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4732
4733         if (nla[NFTA_SET_DESC] != NULL) {
4734                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4735                 if (err < 0)
4736                         return err;
4737
4738                 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4739                         return -EINVAL;
4740         } else if (flags & NFT_SET_CONCAT) {
4741                 return -EINVAL;
4742         }
4743
4744         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4745                 desc.expr = true;
4746
4747         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4748                                  NETLINK_CB(skb).portid);
4749         if (IS_ERR(table)) {
4750                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4751                 return PTR_ERR(table);
4752         }
4753
4754         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4755
4756         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4757         if (IS_ERR(set)) {
4758                 if (PTR_ERR(set) != -ENOENT) {
4759                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4760                         return PTR_ERR(set);
4761                 }
4762         } else {
4763                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
4764
4765                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4766                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4767                         return -EEXIST;
4768                 }
4769                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4770                         return -EOPNOTSUPP;
4771
4772                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
4773                 if (err < 0)
4774                         return err;
4775
4776                 err = 0;
4777                 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
4778                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4779                         err = -EEXIST;
4780                 }
4781
4782                 for (i = 0; i < num_exprs; i++)
4783                         nft_expr_destroy(&ctx, exprs[i]);
4784
4785                 if (err < 0)
4786                         return err;
4787
4788                 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
4789         }
4790
4791         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4792                 return -ENOENT;
4793
4794         ops = nft_select_set_ops(&ctx, nla, &desc);
4795         if (IS_ERR(ops))
4796                 return PTR_ERR(ops);
4797
4798         udlen = 0;
4799         if (nla[NFTA_SET_USERDATA])
4800                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4801
4802         size = 0;
4803         if (ops->privsize != NULL)
4804                 size = ops->privsize(nla, &desc);
4805         alloc_size = sizeof(*set) + size + udlen;
4806         if (alloc_size < size || alloc_size > INT_MAX)
4807                 return -ENOMEM;
4808         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
4809         if (!set)
4810                 return -ENOMEM;
4811
4812         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
4813         if (!name) {
4814                 err = -ENOMEM;
4815                 goto err_set_name;
4816         }
4817
4818         err = nf_tables_set_alloc_name(&ctx, set, name);
4819         kfree(name);
4820         if (err < 0)
4821                 goto err_set_name;
4822
4823         udata = NULL;
4824         if (udlen) {
4825                 udata = set->data + size;
4826                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4827         }
4828
4829         INIT_LIST_HEAD(&set->bindings);
4830         INIT_LIST_HEAD(&set->catchall_list);
4831         set->table = table;
4832         write_pnet(&set->net, net);
4833         set->ops = ops;
4834         set->ktype = desc.ktype;
4835         set->klen = desc.klen;
4836         set->dtype = desc.dtype;
4837         set->objtype = desc.objtype;
4838         set->dlen = desc.dlen;
4839         set->flags = flags;
4840         set->size = desc.size;
4841         set->policy = desc.policy;
4842         set->udlen = udlen;
4843         set->udata = udata;
4844         set->timeout = desc.timeout;
4845         set->gc_int = desc.gc_int;
4846
4847         set->field_count = desc.field_count;
4848         for (i = 0; i < desc.field_count; i++)
4849                 set->field_len[i] = desc.field_len[i];
4850
4851         err = ops->init(set, &desc, nla);
4852         if (err < 0)
4853                 goto err_set_init;
4854
4855         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
4856         if (err < 0)
4857                 goto err_set_destroy;
4858
4859         set->num_exprs = num_exprs;
4860         set->handle = nf_tables_alloc_handle(table);
4861
4862         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4863         if (err < 0)
4864                 goto err_set_expr_alloc;
4865
4866         list_add_tail_rcu(&set->list, &table->sets);
4867         table->use++;
4868         return 0;
4869
4870 err_set_expr_alloc:
4871         for (i = 0; i < set->num_exprs; i++)
4872                 nft_expr_destroy(&ctx, set->exprs[i]);
4873 err_set_destroy:
4874         ops->destroy(set);
4875 err_set_init:
4876         kfree(set->name);
4877 err_set_name:
4878         kvfree(set);
4879         return err;
4880 }
4881
4882 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4883                                      struct nft_set *set)
4884 {
4885         struct nft_set_elem_catchall *next, *catchall;
4886
4887         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4888                 list_del_rcu(&catchall->list);
4889                 nft_set_elem_destroy(set, catchall->elem, true);
4890                 kfree_rcu(catchall, rcu);
4891         }
4892 }
4893
4894 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4895 {
4896         int i;
4897
4898         if (WARN_ON(set->use > 0))
4899                 return;
4900
4901         for (i = 0; i < set->num_exprs; i++)
4902                 nft_expr_destroy(ctx, set->exprs[i]);
4903
4904         set->ops->destroy(set);
4905         nft_set_catchall_destroy(ctx, set);
4906         kfree(set->name);
4907         kvfree(set);
4908 }
4909
4910 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4911                             const struct nlattr * const nla[])
4912 {
4913         struct netlink_ext_ack *extack = info->extack;
4914         u8 genmask = nft_genmask_next(info->net);
4915         u8 family = info->nfmsg->nfgen_family;
4916         struct net *net = info->net;
4917         const struct nlattr *attr;
4918         struct nft_table *table;
4919         struct nft_set *set;
4920         struct nft_ctx ctx;
4921
4922         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4923                 return -EAFNOSUPPORT;
4924
4925         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4926                                  genmask, NETLINK_CB(skb).portid);
4927         if (IS_ERR(table)) {
4928                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4929                 return PTR_ERR(table);
4930         }
4931
4932         if (nla[NFTA_SET_HANDLE]) {
4933                 attr = nla[NFTA_SET_HANDLE];
4934                 set = nft_set_lookup_byhandle(table, attr, genmask);
4935         } else {
4936                 attr = nla[NFTA_SET_NAME];
4937                 set = nft_set_lookup(table, attr, genmask);
4938         }
4939
4940         if (IS_ERR(set)) {
4941                 if (PTR_ERR(set) == -ENOENT &&
4942                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
4943                         return 0;
4944
4945                 NL_SET_BAD_ATTR(extack, attr);
4946                 return PTR_ERR(set);
4947         }
4948         if (set->use ||
4949             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4950              atomic_read(&set->nelems) > 0)) {
4951                 NL_SET_BAD_ATTR(extack, attr);
4952                 return -EBUSY;
4953         }
4954
4955         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4956
4957         return nft_delset(&ctx, set);
4958 }
4959
4960 static int nft_validate_register_store(const struct nft_ctx *ctx,
4961                                        enum nft_registers reg,
4962                                        const struct nft_data *data,
4963                                        enum nft_data_types type,
4964                                        unsigned int len);
4965
4966 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4967                                      struct nft_set *set,
4968                                      struct nft_set_elem *elem)
4969 {
4970         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4971         enum nft_registers dreg;
4972
4973         dreg = nft_type_to_reg(set->dtype);
4974         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4975                                            set->dtype == NFT_DATA_VERDICT ?
4976                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4977                                            set->dlen);
4978 }
4979
4980 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4981                                         struct nft_set *set,
4982                                         const struct nft_set_iter *iter,
4983                                         struct nft_set_elem *elem)
4984 {
4985         return nft_setelem_data_validate(ctx, set, elem);
4986 }
4987
4988 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4989                                        struct nft_set *set)
4990 {
4991         u8 genmask = nft_genmask_next(ctx->net);
4992         struct nft_set_elem_catchall *catchall;
4993         struct nft_set_elem elem;
4994         struct nft_set_ext *ext;
4995         int ret = 0;
4996
4997         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4998                 ext = nft_set_elem_ext(set, catchall->elem);
4999                 if (!nft_set_elem_active(ext, genmask))
5000                         continue;
5001
5002                 elem.priv = catchall->elem;
5003                 ret = nft_setelem_data_validate(ctx, set, &elem);
5004                 if (ret < 0)
5005                         break;
5006         }
5007
5008         return ret;
5009 }
5010
5011 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5012                        struct nft_set_binding *binding)
5013 {
5014         struct nft_set_binding *i;
5015         struct nft_set_iter iter;
5016
5017         if (set->use == UINT_MAX)
5018                 return -EOVERFLOW;
5019
5020         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5021                 return -EBUSY;
5022
5023         if (binding->flags & NFT_SET_MAP) {
5024                 /* If the set is already bound to the same chain all
5025                  * jumps are already validated for that chain.
5026                  */
5027                 list_for_each_entry(i, &set->bindings, list) {
5028                         if (i->flags & NFT_SET_MAP &&
5029                             i->chain == binding->chain)
5030                                 goto bind;
5031                 }
5032
5033                 iter.genmask    = nft_genmask_next(ctx->net);
5034                 iter.skip       = 0;
5035                 iter.count      = 0;
5036                 iter.err        = 0;
5037                 iter.fn         = nf_tables_bind_check_setelem;
5038
5039                 set->ops->walk(ctx, set, &iter);
5040                 if (!iter.err)
5041                         iter.err = nft_set_catchall_bind_check(ctx, set);
5042
5043                 if (iter.err < 0)
5044                         return iter.err;
5045         }
5046 bind:
5047         binding->chain = ctx->chain;
5048         list_add_tail_rcu(&binding->list, &set->bindings);
5049         nft_set_trans_bind(ctx, set);
5050         set->use++;
5051
5052         return 0;
5053 }
5054 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5055
5056 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5057                                  struct nft_set_binding *binding, bool event)
5058 {
5059         list_del_rcu(&binding->list);
5060
5061         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5062                 list_del_rcu(&set->list);
5063                 if (event)
5064                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5065                                              GFP_KERNEL);
5066         }
5067 }
5068
5069 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5070                               struct nft_set_binding *binding,
5071                               enum nft_trans_phase phase)
5072 {
5073         switch (phase) {
5074         case NFT_TRANS_PREPARE:
5075                 set->use--;
5076                 return;
5077         case NFT_TRANS_ABORT:
5078         case NFT_TRANS_RELEASE:
5079                 set->use--;
5080                 fallthrough;
5081         default:
5082                 nf_tables_unbind_set(ctx, set, binding,
5083                                      phase == NFT_TRANS_COMMIT);
5084         }
5085 }
5086 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5087
5088 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5089 {
5090         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5091                 nft_set_destroy(ctx, set);
5092 }
5093 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5094
5095 const struct nft_set_ext_type nft_set_ext_types[] = {
5096         [NFT_SET_EXT_KEY]               = {
5097                 .align  = __alignof__(u32),
5098         },
5099         [NFT_SET_EXT_DATA]              = {
5100                 .align  = __alignof__(u32),
5101         },
5102         [NFT_SET_EXT_EXPRESSIONS]       = {
5103                 .align  = __alignof__(struct nft_set_elem_expr),
5104         },
5105         [NFT_SET_EXT_OBJREF]            = {
5106                 .len    = sizeof(struct nft_object *),
5107                 .align  = __alignof__(struct nft_object *),
5108         },
5109         [NFT_SET_EXT_FLAGS]             = {
5110                 .len    = sizeof(u8),
5111                 .align  = __alignof__(u8),
5112         },
5113         [NFT_SET_EXT_TIMEOUT]           = {
5114                 .len    = sizeof(u64),
5115                 .align  = __alignof__(u64),
5116         },
5117         [NFT_SET_EXT_EXPIRATION]        = {
5118                 .len    = sizeof(u64),
5119                 .align  = __alignof__(u64),
5120         },
5121         [NFT_SET_EXT_USERDATA]          = {
5122                 .len    = sizeof(struct nft_userdata),
5123                 .align  = __alignof__(struct nft_userdata),
5124         },
5125         [NFT_SET_EXT_KEY_END]           = {
5126                 .align  = __alignof__(u32),
5127         },
5128 };
5129
5130 /*
5131  * Set elements
5132  */
5133
5134 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5135         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
5136         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
5137         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
5138         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
5139         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
5140         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
5141                                             .len = NFT_USERDATA_MAXLEN },
5142         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
5143         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
5144                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
5145         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
5146         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
5147 };
5148
5149 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5150         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
5151                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
5152         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
5153                                             .len = NFT_SET_MAXNAMELEN - 1 },
5154         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
5155         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
5156 };
5157
5158 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5159                                   const struct nft_set *set,
5160                                   const struct nft_set_ext *ext)
5161 {
5162         struct nft_set_elem_expr *elem_expr;
5163         u32 size, num_exprs = 0;
5164         struct nft_expr *expr;
5165         struct nlattr *nest;
5166
5167         elem_expr = nft_set_ext_expr(ext);
5168         nft_setelem_expr_foreach(expr, elem_expr, size)
5169                 num_exprs++;
5170
5171         if (num_exprs == 1) {
5172                 expr = nft_setelem_expr_at(elem_expr, 0);
5173                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, false) < 0)
5174                         return -1;
5175
5176                 return 0;
5177         } else if (num_exprs > 1) {
5178                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5179                 if (nest == NULL)
5180                         goto nla_put_failure;
5181
5182                 nft_setelem_expr_foreach(expr, elem_expr, size) {
5183                         expr = nft_setelem_expr_at(elem_expr, size);
5184                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, false) < 0)
5185                                 goto nla_put_failure;
5186                 }
5187                 nla_nest_end(skb, nest);
5188         }
5189         return 0;
5190
5191 nla_put_failure:
5192         return -1;
5193 }
5194
5195 static int nf_tables_fill_setelem(struct sk_buff *skb,
5196                                   const struct nft_set *set,
5197                                   const struct nft_set_elem *elem)
5198 {
5199         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5200         unsigned char *b = skb_tail_pointer(skb);
5201         struct nlattr *nest;
5202
5203         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5204         if (nest == NULL)
5205                 goto nla_put_failure;
5206
5207         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5208             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5209                           NFT_DATA_VALUE, set->klen) < 0)
5210                 goto nla_put_failure;
5211
5212         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5213             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5214                           NFT_DATA_VALUE, set->klen) < 0)
5215                 goto nla_put_failure;
5216
5217         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5218             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5219                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5220                           set->dlen) < 0)
5221                 goto nla_put_failure;
5222
5223         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5224             nft_set_elem_expr_dump(skb, set, ext))
5225                 goto nla_put_failure;
5226
5227         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5228             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5229                            (*nft_set_ext_obj(ext))->key.name) < 0)
5230                 goto nla_put_failure;
5231
5232         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5233             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5234                          htonl(*nft_set_ext_flags(ext))))
5235                 goto nla_put_failure;
5236
5237         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5238             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5239                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5240                          NFTA_SET_ELEM_PAD))
5241                 goto nla_put_failure;
5242
5243         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5244                 u64 expires, now = get_jiffies_64();
5245
5246                 expires = *nft_set_ext_expiration(ext);
5247                 if (time_before64(now, expires))
5248                         expires -= now;
5249                 else
5250                         expires = 0;
5251
5252                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5253                                  nf_jiffies64_to_msecs(expires),
5254                                  NFTA_SET_ELEM_PAD))
5255                         goto nla_put_failure;
5256         }
5257
5258         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5259                 struct nft_userdata *udata;
5260
5261                 udata = nft_set_ext_userdata(ext);
5262                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5263                             udata->len + 1, udata->data))
5264                         goto nla_put_failure;
5265         }
5266
5267         nla_nest_end(skb, nest);
5268         return 0;
5269
5270 nla_put_failure:
5271         nlmsg_trim(skb, b);
5272         return -EMSGSIZE;
5273 }
5274
5275 struct nft_set_dump_args {
5276         const struct netlink_callback   *cb;
5277         struct nft_set_iter             iter;
5278         struct sk_buff                  *skb;
5279 };
5280
5281 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5282                                   struct nft_set *set,
5283                                   const struct nft_set_iter *iter,
5284                                   struct nft_set_elem *elem)
5285 {
5286         struct nft_set_dump_args *args;
5287
5288         args = container_of(iter, struct nft_set_dump_args, iter);
5289         return nf_tables_fill_setelem(args->skb, set, elem);
5290 }
5291
5292 struct nft_set_dump_ctx {
5293         const struct nft_set    *set;
5294         struct nft_ctx          ctx;
5295 };
5296
5297 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5298                                  const struct nft_set *set)
5299 {
5300         struct nft_set_elem_catchall *catchall;
5301         u8 genmask = nft_genmask_cur(net);
5302         struct nft_set_elem elem;
5303         struct nft_set_ext *ext;
5304         int ret = 0;
5305
5306         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5307                 ext = nft_set_elem_ext(set, catchall->elem);
5308                 if (!nft_set_elem_active(ext, genmask) ||
5309                     nft_set_elem_expired(ext))
5310                         continue;
5311
5312                 elem.priv = catchall->elem;
5313                 ret = nf_tables_fill_setelem(skb, set, &elem);
5314                 break;
5315         }
5316
5317         return ret;
5318 }
5319
5320 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5321 {
5322         struct nft_set_dump_ctx *dump_ctx = cb->data;
5323         struct net *net = sock_net(skb->sk);
5324         struct nftables_pernet *nft_net;
5325         struct nft_table *table;
5326         struct nft_set *set;
5327         struct nft_set_dump_args args;
5328         bool set_found = false;
5329         struct nlmsghdr *nlh;
5330         struct nlattr *nest;
5331         u32 portid, seq;
5332         int event;
5333
5334         rcu_read_lock();
5335         nft_net = nft_pernet(net);
5336         cb->seq = READ_ONCE(nft_net->base_seq);
5337
5338         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5339                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5340                     dump_ctx->ctx.family != table->family)
5341                         continue;
5342
5343                 if (table != dump_ctx->ctx.table)
5344                         continue;
5345
5346                 list_for_each_entry_rcu(set, &table->sets, list) {
5347                         if (set == dump_ctx->set) {
5348                                 set_found = true;
5349                                 break;
5350                         }
5351                 }
5352                 break;
5353         }
5354
5355         if (!set_found) {
5356                 rcu_read_unlock();
5357                 return -ENOENT;
5358         }
5359
5360         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5361         portid = NETLINK_CB(cb->skb).portid;
5362         seq    = cb->nlh->nlmsg_seq;
5363
5364         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5365                            table->family, NFNETLINK_V0, nft_base_seq(net));
5366         if (!nlh)
5367                 goto nla_put_failure;
5368
5369         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5370                 goto nla_put_failure;
5371         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5372                 goto nla_put_failure;
5373
5374         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5375         if (nest == NULL)
5376                 goto nla_put_failure;
5377
5378         args.cb                 = cb;
5379         args.skb                = skb;
5380         args.iter.genmask       = nft_genmask_cur(net);
5381         args.iter.skip          = cb->args[0];
5382         args.iter.count         = 0;
5383         args.iter.err           = 0;
5384         args.iter.fn            = nf_tables_dump_setelem;
5385         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5386
5387         if (!args.iter.err && args.iter.count == cb->args[0])
5388                 args.iter.err = nft_set_catchall_dump(net, skb, set);
5389         rcu_read_unlock();
5390
5391         nla_nest_end(skb, nest);
5392         nlmsg_end(skb, nlh);
5393
5394         if (args.iter.err && args.iter.err != -EMSGSIZE)
5395                 return args.iter.err;
5396         if (args.iter.count == cb->args[0])
5397                 return 0;
5398
5399         cb->args[0] = args.iter.count;
5400         return skb->len;
5401
5402 nla_put_failure:
5403         rcu_read_unlock();
5404         return -ENOSPC;
5405 }
5406
5407 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5408 {
5409         struct nft_set_dump_ctx *dump_ctx = cb->data;
5410
5411         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5412
5413         return cb->data ? 0 : -ENOMEM;
5414 }
5415
5416 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5417 {
5418         kfree(cb->data);
5419         return 0;
5420 }
5421
5422 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5423                                        const struct nft_ctx *ctx, u32 seq,
5424                                        u32 portid, int event, u16 flags,
5425                                        const struct nft_set *set,
5426                                        const struct nft_set_elem *elem)
5427 {
5428         struct nlmsghdr *nlh;
5429         struct nlattr *nest;
5430         int err;
5431
5432         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5433         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5434                            NFNETLINK_V0, nft_base_seq(ctx->net));
5435         if (!nlh)
5436                 goto nla_put_failure;
5437
5438         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5439                 goto nla_put_failure;
5440         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5441                 goto nla_put_failure;
5442
5443         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5444         if (nest == NULL)
5445                 goto nla_put_failure;
5446
5447         err = nf_tables_fill_setelem(skb, set, elem);
5448         if (err < 0)
5449                 goto nla_put_failure;
5450
5451         nla_nest_end(skb, nest);
5452
5453         nlmsg_end(skb, nlh);
5454         return 0;
5455
5456 nla_put_failure:
5457         nlmsg_trim(skb, nlh);
5458         return -1;
5459 }
5460
5461 static int nft_setelem_parse_flags(const struct nft_set *set,
5462                                    const struct nlattr *attr, u32 *flags)
5463 {
5464         if (attr == NULL)
5465                 return 0;
5466
5467         *flags = ntohl(nla_get_be32(attr));
5468         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5469                 return -EOPNOTSUPP;
5470         if (!(set->flags & NFT_SET_INTERVAL) &&
5471             *flags & NFT_SET_ELEM_INTERVAL_END)
5472                 return -EINVAL;
5473         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5474             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5475                 return -EINVAL;
5476
5477         return 0;
5478 }
5479
5480 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5481                                  struct nft_data *key, struct nlattr *attr)
5482 {
5483         struct nft_data_desc desc = {
5484                 .type   = NFT_DATA_VALUE,
5485                 .size   = NFT_DATA_VALUE_MAXLEN,
5486                 .len    = set->klen,
5487         };
5488
5489         return nft_data_init(ctx, key, &desc, attr);
5490 }
5491
5492 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5493                                   struct nft_data_desc *desc,
5494                                   struct nft_data *data,
5495                                   struct nlattr *attr)
5496 {
5497         u32 dtype;
5498
5499         if (set->dtype == NFT_DATA_VERDICT)
5500                 dtype = NFT_DATA_VERDICT;
5501         else
5502                 dtype = NFT_DATA_VALUE;
5503
5504         desc->type = dtype;
5505         desc->size = NFT_DATA_VALUE_MAXLEN;
5506         desc->len = set->dlen;
5507         desc->flags = NFT_DATA_DESC_SETELEM;
5508
5509         return nft_data_init(ctx, data, desc, attr);
5510 }
5511
5512 static void *nft_setelem_catchall_get(const struct net *net,
5513                                       const struct nft_set *set)
5514 {
5515         struct nft_set_elem_catchall *catchall;
5516         u8 genmask = nft_genmask_cur(net);
5517         struct nft_set_ext *ext;
5518         void *priv = NULL;
5519
5520         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5521                 ext = nft_set_elem_ext(set, catchall->elem);
5522                 if (!nft_set_elem_active(ext, genmask) ||
5523                     nft_set_elem_expired(ext))
5524                         continue;
5525
5526                 priv = catchall->elem;
5527                 break;
5528         }
5529
5530         return priv;
5531 }
5532
5533 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5534                            struct nft_set_elem *elem, u32 flags)
5535 {
5536         void *priv;
5537
5538         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5539                 priv = set->ops->get(ctx->net, set, elem, flags);
5540                 if (IS_ERR(priv))
5541                         return PTR_ERR(priv);
5542         } else {
5543                 priv = nft_setelem_catchall_get(ctx->net, set);
5544                 if (!priv)
5545                         return -ENOENT;
5546         }
5547         elem->priv = priv;
5548
5549         return 0;
5550 }
5551
5552 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5553                             const struct nlattr *attr)
5554 {
5555         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5556         struct nft_set_elem elem;
5557         struct sk_buff *skb;
5558         uint32_t flags = 0;
5559         int err;
5560
5561         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5562                                           nft_set_elem_policy, NULL);
5563         if (err < 0)
5564                 return err;
5565
5566         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5567         if (err < 0)
5568                 return err;
5569
5570         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5571                 return -EINVAL;
5572
5573         if (nla[NFTA_SET_ELEM_KEY]) {
5574                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5575                                             nla[NFTA_SET_ELEM_KEY]);
5576                 if (err < 0)
5577                         return err;
5578         }
5579
5580         if (nla[NFTA_SET_ELEM_KEY_END]) {
5581                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5582                                             nla[NFTA_SET_ELEM_KEY_END]);
5583                 if (err < 0)
5584                         return err;
5585         }
5586
5587         err = nft_setelem_get(ctx, set, &elem, flags);
5588         if (err < 0)
5589                 return err;
5590
5591         err = -ENOMEM;
5592         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5593         if (skb == NULL)
5594                 return err;
5595
5596         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5597                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
5598         if (err < 0)
5599                 goto err_fill_setelem;
5600
5601         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5602
5603 err_fill_setelem:
5604         kfree_skb(skb);
5605         return err;
5606 }
5607
5608 /* called with rcu_read_lock held */
5609 static int nf_tables_getsetelem(struct sk_buff *skb,
5610                                 const struct nfnl_info *info,
5611                                 const struct nlattr * const nla[])
5612 {
5613         struct netlink_ext_ack *extack = info->extack;
5614         u8 genmask = nft_genmask_cur(info->net);
5615         u8 family = info->nfmsg->nfgen_family;
5616         struct net *net = info->net;
5617         struct nft_table *table;
5618         struct nft_set *set;
5619         struct nlattr *attr;
5620         struct nft_ctx ctx;
5621         int rem, err = 0;
5622
5623         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5624                                  genmask, 0);
5625         if (IS_ERR(table)) {
5626                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5627                 return PTR_ERR(table);
5628         }
5629
5630         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5631         if (IS_ERR(set))
5632                 return PTR_ERR(set);
5633
5634         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5635
5636         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5637                 struct netlink_dump_control c = {
5638                         .start = nf_tables_dump_set_start,
5639                         .dump = nf_tables_dump_set,
5640                         .done = nf_tables_dump_set_done,
5641                         .module = THIS_MODULE,
5642                 };
5643                 struct nft_set_dump_ctx dump_ctx = {
5644                         .set = set,
5645                         .ctx = ctx,
5646                 };
5647
5648                 c.data = &dump_ctx;
5649                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5650         }
5651
5652         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5653                 return -EINVAL;
5654
5655         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5656                 err = nft_get_set_elem(&ctx, set, attr);
5657                 if (err < 0) {
5658                         NL_SET_BAD_ATTR(extack, attr);
5659                         break;
5660                 }
5661         }
5662
5663         return err;
5664 }
5665
5666 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5667                                      const struct nft_set *set,
5668                                      const struct nft_set_elem *elem,
5669                                      int event)
5670 {
5671         struct nftables_pernet *nft_net;
5672         struct net *net = ctx->net;
5673         u32 portid = ctx->portid;
5674         struct sk_buff *skb;
5675         u16 flags = 0;
5676         int err;
5677
5678         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5679                 return;
5680
5681         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5682         if (skb == NULL)
5683                 goto err;
5684
5685         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5686                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5687
5688         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5689                                           set, elem);
5690         if (err < 0) {
5691                 kfree_skb(skb);
5692                 goto err;
5693         }
5694
5695         nft_net = nft_pernet(net);
5696         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5697         return;
5698 err:
5699         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5700 }
5701
5702 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5703                                               int msg_type,
5704                                               struct nft_set *set)
5705 {
5706         struct nft_trans *trans;
5707
5708         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5709         if (trans == NULL)
5710                 return NULL;
5711
5712         nft_trans_elem_set(trans) = set;
5713         return trans;
5714 }
5715
5716 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5717                                          const struct nft_set *set,
5718                                          const struct nlattr *attr)
5719 {
5720         struct nft_expr *expr;
5721         int err;
5722
5723         expr = nft_expr_init(ctx, attr);
5724         if (IS_ERR(expr))
5725                 return expr;
5726
5727         err = -EOPNOTSUPP;
5728         if (expr->ops->type->flags & NFT_EXPR_GC) {
5729                 if (set->flags & NFT_SET_TIMEOUT)
5730                         goto err_set_elem_expr;
5731                 if (!set->ops->gc_init)
5732                         goto err_set_elem_expr;
5733                 set->ops->gc_init(set);
5734         }
5735
5736         return expr;
5737
5738 err_set_elem_expr:
5739         nft_expr_destroy(ctx, expr);
5740         return ERR_PTR(err);
5741 }
5742
5743 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
5744 {
5745         len += nft_set_ext_types[id].len;
5746         if (len > tmpl->ext_len[id] ||
5747             len > U8_MAX)
5748                 return -1;
5749
5750         return 0;
5751 }
5752
5753 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
5754                               void *to, const void *from, u32 len)
5755 {
5756         if (nft_set_ext_check(tmpl, id, len) < 0)
5757                 return -1;
5758
5759         memcpy(to, from, len);
5760
5761         return 0;
5762 }
5763
5764 void *nft_set_elem_init(const struct nft_set *set,
5765                         const struct nft_set_ext_tmpl *tmpl,
5766                         const u32 *key, const u32 *key_end,
5767                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5768 {
5769         struct nft_set_ext *ext;
5770         void *elem;
5771
5772         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5773         if (elem == NULL)
5774                 return ERR_PTR(-ENOMEM);
5775
5776         ext = nft_set_elem_ext(set, elem);
5777         nft_set_ext_init(ext, tmpl);
5778
5779         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5780             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
5781                                nft_set_ext_key(ext), key, set->klen) < 0)
5782                 goto err_ext_check;
5783
5784         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5785             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
5786                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
5787                 goto err_ext_check;
5788
5789         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5790             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
5791                                nft_set_ext_data(ext), data, set->dlen) < 0)
5792                 goto err_ext_check;
5793
5794         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5795                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5796                 if (expiration == 0)
5797                         *nft_set_ext_expiration(ext) += timeout;
5798         }
5799         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5800                 *nft_set_ext_timeout(ext) = timeout;
5801
5802         return elem;
5803
5804 err_ext_check:
5805         kfree(elem);
5806
5807         return ERR_PTR(-EINVAL);
5808 }
5809
5810 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5811                                         struct nft_expr *expr)
5812 {
5813         if (expr->ops->destroy_clone) {
5814                 expr->ops->destroy_clone(ctx, expr);
5815                 module_put(expr->ops->type->owner);
5816         } else {
5817                 nf_tables_expr_destroy(ctx, expr);
5818         }
5819 }
5820
5821 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5822                                       struct nft_set_elem_expr *elem_expr)
5823 {
5824         struct nft_expr *expr;
5825         u32 size;
5826
5827         nft_setelem_expr_foreach(expr, elem_expr, size)
5828                 __nft_set_elem_expr_destroy(ctx, expr);
5829 }
5830
5831 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5832                           bool destroy_expr)
5833 {
5834         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5835         struct nft_ctx ctx = {
5836                 .net    = read_pnet(&set->net),
5837                 .family = set->table->family,
5838         };
5839
5840         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5841         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5842                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5843         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5844                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5845
5846         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5847                 (*nft_set_ext_obj(ext))->use--;
5848         kfree(elem);
5849 }
5850 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5851
5852 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5853  * with the refcounting from the preparation phase.
5854  */
5855 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5856                                        const struct nft_set *set, void *elem)
5857 {
5858         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5859
5860         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5861                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5862
5863         kfree(elem);
5864 }
5865
5866 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5867                             struct nft_expr *expr_array[])
5868 {
5869         struct nft_expr *expr;
5870         int err, i, k;
5871
5872         for (i = 0; i < set->num_exprs; i++) {
5873                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
5874                 if (!expr)
5875                         goto err_expr;
5876
5877                 err = nft_expr_clone(expr, set->exprs[i]);
5878                 if (err < 0) {
5879                         kfree(expr);
5880                         goto err_expr;
5881                 }
5882                 expr_array[i] = expr;
5883         }
5884
5885         return 0;
5886
5887 err_expr:
5888         for (k = i - 1; k >= 0; k--)
5889                 nft_expr_destroy(ctx, expr_array[k]);
5890
5891         return -ENOMEM;
5892 }
5893
5894 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5895                                    const struct nft_set_ext_tmpl *tmpl,
5896                                    const struct nft_set_ext *ext,
5897                                    struct nft_expr *expr_array[],
5898                                    u32 num_exprs)
5899 {
5900         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5901         u32 len = sizeof(struct nft_set_elem_expr);
5902         struct nft_expr *expr;
5903         int i, err;
5904
5905         if (num_exprs == 0)
5906                 return 0;
5907
5908         for (i = 0; i < num_exprs; i++)
5909                 len += expr_array[i]->ops->size;
5910
5911         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
5912                 return -EINVAL;
5913
5914         for (i = 0; i < num_exprs; i++) {
5915                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5916                 err = nft_expr_clone(expr, expr_array[i]);
5917                 if (err < 0)
5918                         goto err_elem_expr_setup;
5919
5920                 elem_expr->size += expr_array[i]->ops->size;
5921                 nft_expr_destroy(ctx, expr_array[i]);
5922                 expr_array[i] = NULL;
5923         }
5924
5925         return 0;
5926
5927 err_elem_expr_setup:
5928         for (; i < num_exprs; i++) {
5929                 nft_expr_destroy(ctx, expr_array[i]);
5930                 expr_array[i] = NULL;
5931         }
5932
5933         return -ENOMEM;
5934 }
5935
5936 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5937                                             const struct nft_set *set)
5938 {
5939         struct nft_set_elem_catchall *catchall;
5940         u8 genmask = nft_genmask_cur(net);
5941         struct nft_set_ext *ext;
5942
5943         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5944                 ext = nft_set_elem_ext(set, catchall->elem);
5945                 if (nft_set_elem_active(ext, genmask) &&
5946                     !nft_set_elem_expired(ext))
5947                         return ext;
5948         }
5949
5950         return NULL;
5951 }
5952 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5953
5954 void *nft_set_catchall_gc(const struct nft_set *set)
5955 {
5956         struct nft_set_elem_catchall *catchall, *next;
5957         struct nft_set_ext *ext;
5958         void *elem = NULL;
5959
5960         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5961                 ext = nft_set_elem_ext(set, catchall->elem);
5962
5963                 if (!nft_set_elem_expired(ext) ||
5964                     nft_set_elem_mark_busy(ext))
5965                         continue;
5966
5967                 elem = catchall->elem;
5968                 list_del_rcu(&catchall->list);
5969                 kfree_rcu(catchall, rcu);
5970                 break;
5971         }
5972
5973         return elem;
5974 }
5975 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5976
5977 static int nft_setelem_catchall_insert(const struct net *net,
5978                                        struct nft_set *set,
5979                                        const struct nft_set_elem *elem,
5980                                        struct nft_set_ext **pext)
5981 {
5982         struct nft_set_elem_catchall *catchall;
5983         u8 genmask = nft_genmask_next(net);
5984         struct nft_set_ext *ext;
5985
5986         list_for_each_entry(catchall, &set->catchall_list, list) {
5987                 ext = nft_set_elem_ext(set, catchall->elem);
5988                 if (nft_set_elem_active(ext, genmask)) {
5989                         *pext = ext;
5990                         return -EEXIST;
5991                 }
5992         }
5993
5994         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5995         if (!catchall)
5996                 return -ENOMEM;
5997
5998         catchall->elem = elem->priv;
5999         list_add_tail_rcu(&catchall->list, &set->catchall_list);
6000
6001         return 0;
6002 }
6003
6004 static int nft_setelem_insert(const struct net *net,
6005                               struct nft_set *set,
6006                               const struct nft_set_elem *elem,
6007                               struct nft_set_ext **ext, unsigned int flags)
6008 {
6009         int ret;
6010
6011         if (flags & NFT_SET_ELEM_CATCHALL)
6012                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6013         else
6014                 ret = set->ops->insert(net, set, elem, ext);
6015
6016         return ret;
6017 }
6018
6019 static bool nft_setelem_is_catchall(const struct nft_set *set,
6020                                     const struct nft_set_elem *elem)
6021 {
6022         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6023
6024         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6025             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6026                 return true;
6027
6028         return false;
6029 }
6030
6031 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6032                                  struct nft_set_elem *elem)
6033 {
6034         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6035
6036         if (nft_setelem_is_catchall(set, elem)) {
6037                 nft_set_elem_change_active(net, set, ext);
6038                 nft_set_elem_clear_busy(ext);
6039         } else {
6040                 set->ops->activate(net, set, elem);
6041         }
6042 }
6043
6044 static int nft_setelem_catchall_deactivate(const struct net *net,
6045                                            struct nft_set *set,
6046                                            struct nft_set_elem *elem)
6047 {
6048         struct nft_set_elem_catchall *catchall;
6049         struct nft_set_ext *ext;
6050
6051         list_for_each_entry(catchall, &set->catchall_list, list) {
6052                 ext = nft_set_elem_ext(set, catchall->elem);
6053                 if (!nft_is_active(net, ext) ||
6054                     nft_set_elem_mark_busy(ext))
6055                         continue;
6056
6057                 kfree(elem->priv);
6058                 elem->priv = catchall->elem;
6059                 nft_set_elem_change_active(net, set, ext);
6060                 return 0;
6061         }
6062
6063         return -ENOENT;
6064 }
6065
6066 static int __nft_setelem_deactivate(const struct net *net,
6067                                     struct nft_set *set,
6068                                     struct nft_set_elem *elem)
6069 {
6070         void *priv;
6071
6072         priv = set->ops->deactivate(net, set, elem);
6073         if (!priv)
6074                 return -ENOENT;
6075
6076         kfree(elem->priv);
6077         elem->priv = priv;
6078         set->ndeact++;
6079
6080         return 0;
6081 }
6082
6083 static int nft_setelem_deactivate(const struct net *net,
6084                                   struct nft_set *set,
6085                                   struct nft_set_elem *elem, u32 flags)
6086 {
6087         int ret;
6088
6089         if (flags & NFT_SET_ELEM_CATCHALL)
6090                 ret = nft_setelem_catchall_deactivate(net, set, elem);
6091         else
6092                 ret = __nft_setelem_deactivate(net, set, elem);
6093
6094         return ret;
6095 }
6096
6097 static void nft_setelem_catchall_remove(const struct net *net,
6098                                         const struct nft_set *set,
6099                                         const struct nft_set_elem *elem)
6100 {
6101         struct nft_set_elem_catchall *catchall, *next;
6102
6103         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6104                 if (catchall->elem == elem->priv) {
6105                         list_del_rcu(&catchall->list);
6106                         kfree_rcu(catchall, rcu);
6107                         break;
6108                 }
6109         }
6110 }
6111
6112 static void nft_setelem_remove(const struct net *net,
6113                                const struct nft_set *set,
6114                                const struct nft_set_elem *elem)
6115 {
6116         if (nft_setelem_is_catchall(set, elem))
6117                 nft_setelem_catchall_remove(net, set, elem);
6118         else
6119                 set->ops->remove(net, set, elem);
6120 }
6121
6122 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6123                                       struct nlattr **nla, u32 flags)
6124 {
6125         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6126                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6127                 if (flags & NFT_SET_ELEM_INTERVAL_END)
6128                         return false;
6129
6130                 if (nla[NFTA_SET_ELEM_KEY_END] &&
6131                     flags & NFT_SET_ELEM_CATCHALL)
6132                         return false;
6133         } else {
6134                 if (nla[NFTA_SET_ELEM_KEY_END])
6135                         return false;
6136         }
6137
6138         return true;
6139 }
6140
6141 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6142                             const struct nlattr *attr, u32 nlmsg_flags)
6143 {
6144         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6145         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6146         u8 genmask = nft_genmask_next(ctx->net);
6147         u32 flags = 0, size = 0, num_exprs = 0;
6148         struct nft_set_ext_tmpl tmpl;
6149         struct nft_set_ext *ext, *ext2;
6150         struct nft_set_elem elem;
6151         struct nft_set_binding *binding;
6152         struct nft_object *obj = NULL;
6153         struct nft_userdata *udata;
6154         struct nft_data_desc desc;
6155         enum nft_registers dreg;
6156         struct nft_trans *trans;
6157         u64 timeout;
6158         u64 expiration;
6159         int err, i;
6160         u8 ulen;
6161
6162         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6163                                           nft_set_elem_policy, NULL);
6164         if (err < 0)
6165                 return err;
6166
6167         nft_set_ext_prepare(&tmpl);
6168
6169         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6170         if (err < 0)
6171                 return err;
6172
6173         if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6174             (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6175                 return -EINVAL;
6176
6177         if (flags != 0) {
6178                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6179                 if (err < 0)
6180                         return err;
6181         }
6182
6183         if (set->flags & NFT_SET_MAP) {
6184                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6185                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6186                         return -EINVAL;
6187         } else {
6188                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6189                         return -EINVAL;
6190         }
6191
6192         if (set->flags & NFT_SET_OBJECT) {
6193                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6194                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6195                         return -EINVAL;
6196         } else {
6197                 if (nla[NFTA_SET_ELEM_OBJREF])
6198                         return -EINVAL;
6199         }
6200
6201         if (!nft_setelem_valid_key_end(set, nla, flags))
6202                 return -EINVAL;
6203
6204         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6205              (nla[NFTA_SET_ELEM_DATA] ||
6206               nla[NFTA_SET_ELEM_OBJREF] ||
6207               nla[NFTA_SET_ELEM_TIMEOUT] ||
6208               nla[NFTA_SET_ELEM_EXPIRATION] ||
6209               nla[NFTA_SET_ELEM_USERDATA] ||
6210               nla[NFTA_SET_ELEM_EXPR] ||
6211               nla[NFTA_SET_ELEM_KEY_END] ||
6212               nla[NFTA_SET_ELEM_EXPRESSIONS]))
6213                 return -EINVAL;
6214
6215         timeout = 0;
6216         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6217                 if (!(set->flags & NFT_SET_TIMEOUT))
6218                         return -EINVAL;
6219                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6220                                             &timeout);
6221                 if (err)
6222                         return err;
6223         } else if (set->flags & NFT_SET_TIMEOUT &&
6224                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6225                 timeout = READ_ONCE(set->timeout);
6226         }
6227
6228         expiration = 0;
6229         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6230                 if (!(set->flags & NFT_SET_TIMEOUT))
6231                         return -EINVAL;
6232                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6233                                             &expiration);
6234                 if (err)
6235                         return err;
6236         }
6237
6238         if (nla[NFTA_SET_ELEM_EXPR]) {
6239                 struct nft_expr *expr;
6240
6241                 if (set->num_exprs && set->num_exprs != 1)
6242                         return -EOPNOTSUPP;
6243
6244                 expr = nft_set_elem_expr_alloc(ctx, set,
6245                                                nla[NFTA_SET_ELEM_EXPR]);
6246                 if (IS_ERR(expr))
6247                         return PTR_ERR(expr);
6248
6249                 expr_array[0] = expr;
6250                 num_exprs = 1;
6251
6252                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6253                         err = -EOPNOTSUPP;
6254                         goto err_set_elem_expr;
6255                 }
6256         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6257                 struct nft_expr *expr;
6258                 struct nlattr *tmp;
6259                 int left;
6260
6261                 i = 0;
6262                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6263                         if (i == NFT_SET_EXPR_MAX ||
6264                             (set->num_exprs && set->num_exprs == i)) {
6265                                 err = -E2BIG;
6266                                 goto err_set_elem_expr;
6267                         }
6268                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6269                                 err = -EINVAL;
6270                                 goto err_set_elem_expr;
6271                         }
6272                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6273                         if (IS_ERR(expr)) {
6274                                 err = PTR_ERR(expr);
6275                                 goto err_set_elem_expr;
6276                         }
6277                         expr_array[i] = expr;
6278                         num_exprs++;
6279
6280                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6281                                 err = -EOPNOTSUPP;
6282                                 goto err_set_elem_expr;
6283                         }
6284                         i++;
6285                 }
6286                 if (set->num_exprs && set->num_exprs != i) {
6287                         err = -EOPNOTSUPP;
6288                         goto err_set_elem_expr;
6289                 }
6290         } else if (set->num_exprs > 0 &&
6291                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6292                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6293                 if (err < 0)
6294                         goto err_set_elem_expr_clone;
6295
6296                 num_exprs = set->num_exprs;
6297         }
6298
6299         if (nla[NFTA_SET_ELEM_KEY]) {
6300                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6301                                             nla[NFTA_SET_ELEM_KEY]);
6302                 if (err < 0)
6303                         goto err_set_elem_expr;
6304
6305                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6306                 if (err < 0)
6307                         goto err_parse_key;
6308         }
6309
6310         if (nla[NFTA_SET_ELEM_KEY_END]) {
6311                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6312                                             nla[NFTA_SET_ELEM_KEY_END]);
6313                 if (err < 0)
6314                         goto err_parse_key;
6315
6316                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6317                 if (err < 0)
6318                         goto err_parse_key_end;
6319         }
6320
6321         if (timeout > 0) {
6322                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6323                 if (err < 0)
6324                         goto err_parse_key_end;
6325
6326                 if (timeout != READ_ONCE(set->timeout)) {
6327                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6328                         if (err < 0)
6329                                 goto err_parse_key_end;
6330                 }
6331         }
6332
6333         if (num_exprs) {
6334                 for (i = 0; i < num_exprs; i++)
6335                         size += expr_array[i]->ops->size;
6336
6337                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6338                                              sizeof(struct nft_set_elem_expr) + size);
6339                 if (err < 0)
6340                         goto err_parse_key_end;
6341         }
6342
6343         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6344                 obj = nft_obj_lookup(ctx->net, ctx->table,
6345                                      nla[NFTA_SET_ELEM_OBJREF],
6346                                      set->objtype, genmask);
6347                 if (IS_ERR(obj)) {
6348                         err = PTR_ERR(obj);
6349                         goto err_parse_key_end;
6350                 }
6351                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6352                 if (err < 0)
6353                         goto err_parse_key_end;
6354         }
6355
6356         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6357                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6358                                              nla[NFTA_SET_ELEM_DATA]);
6359                 if (err < 0)
6360                         goto err_parse_key_end;
6361
6362                 dreg = nft_type_to_reg(set->dtype);
6363                 list_for_each_entry(binding, &set->bindings, list) {
6364                         struct nft_ctx bind_ctx = {
6365                                 .net    = ctx->net,
6366                                 .family = ctx->family,
6367                                 .table  = ctx->table,
6368                                 .chain  = (struct nft_chain *)binding->chain,
6369                         };
6370
6371                         if (!(binding->flags & NFT_SET_MAP))
6372                                 continue;
6373
6374                         err = nft_validate_register_store(&bind_ctx, dreg,
6375                                                           &elem.data.val,
6376                                                           desc.type, desc.len);
6377                         if (err < 0)
6378                                 goto err_parse_data;
6379
6380                         if (desc.type == NFT_DATA_VERDICT &&
6381                             (elem.data.val.verdict.code == NFT_GOTO ||
6382                              elem.data.val.verdict.code == NFT_JUMP))
6383                                 nft_validate_state_update(ctx->table,
6384                                                           NFT_VALIDATE_NEED);
6385                 }
6386
6387                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6388                 if (err < 0)
6389                         goto err_parse_data;
6390         }
6391
6392         /* The full maximum length of userdata can exceed the maximum
6393          * offset value (U8_MAX) for following extensions, therefor it
6394          * must be the last extension added.
6395          */
6396         ulen = 0;
6397         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6398                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6399                 if (ulen > 0) {
6400                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6401                                                      ulen);
6402                         if (err < 0)
6403                                 goto err_parse_data;
6404                 }
6405         }
6406
6407         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6408                                       elem.key_end.val.data, elem.data.val.data,
6409                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6410         if (IS_ERR(elem.priv)) {
6411                 err = PTR_ERR(elem.priv);
6412                 goto err_parse_data;
6413         }
6414
6415         ext = nft_set_elem_ext(set, elem.priv);
6416         if (flags)
6417                 *nft_set_ext_flags(ext) = flags;
6418
6419         if (ulen > 0) {
6420                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6421                         err = -EINVAL;
6422                         goto err_elem_userdata;
6423                 }
6424                 udata = nft_set_ext_userdata(ext);
6425                 udata->len = ulen - 1;
6426                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6427         }
6428         if (obj) {
6429                 *nft_set_ext_obj(ext) = obj;
6430                 obj->use++;
6431         }
6432         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6433         if (err < 0)
6434                 goto err_elem_free;
6435
6436         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6437         if (trans == NULL) {
6438                 err = -ENOMEM;
6439                 goto err_elem_free;
6440         }
6441
6442         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6443
6444         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6445         if (err) {
6446                 if (err == -EEXIST) {
6447                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6448                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6449                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6450                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6451                                 goto err_element_clash;
6452                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6453                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6454                              memcmp(nft_set_ext_data(ext),
6455                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6456                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6457                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6458                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6459                                 goto err_element_clash;
6460                         else if (!(nlmsg_flags & NLM_F_EXCL))
6461                                 err = 0;
6462                 } else if (err == -ENOTEMPTY) {
6463                         /* ENOTEMPTY reports overlapping between this element
6464                          * and an existing one.
6465                          */
6466                         err = -EEXIST;
6467                 }
6468                 goto err_element_clash;
6469         }
6470
6471         if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6472             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6473                 err = -ENFILE;
6474                 goto err_set_full;
6475         }
6476
6477         nft_trans_elem(trans) = elem;
6478         nft_trans_commit_list_add_tail(ctx->net, trans);
6479         return 0;
6480
6481 err_set_full:
6482         nft_setelem_remove(ctx->net, set, &elem);
6483 err_element_clash:
6484         kfree(trans);
6485 err_elem_free:
6486         if (obj)
6487                 obj->use--;
6488 err_elem_userdata:
6489         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6490 err_parse_data:
6491         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6492                 nft_data_release(&elem.data.val, desc.type);
6493 err_parse_key_end:
6494         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6495 err_parse_key:
6496         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6497 err_set_elem_expr:
6498         for (i = 0; i < num_exprs && expr_array[i]; i++)
6499                 nft_expr_destroy(ctx, expr_array[i]);
6500 err_set_elem_expr_clone:
6501         return err;
6502 }
6503
6504 static int nf_tables_newsetelem(struct sk_buff *skb,
6505                                 const struct nfnl_info *info,
6506                                 const struct nlattr * const nla[])
6507 {
6508         struct netlink_ext_ack *extack = info->extack;
6509         u8 genmask = nft_genmask_next(info->net);
6510         u8 family = info->nfmsg->nfgen_family;
6511         struct net *net = info->net;
6512         const struct nlattr *attr;
6513         struct nft_table *table;
6514         struct nft_set *set;
6515         struct nft_ctx ctx;
6516         int rem, err;
6517
6518         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6519                 return -EINVAL;
6520
6521         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6522                                  genmask, NETLINK_CB(skb).portid);
6523         if (IS_ERR(table)) {
6524                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6525                 return PTR_ERR(table);
6526         }
6527
6528         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6529                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6530         if (IS_ERR(set))
6531                 return PTR_ERR(set);
6532
6533         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6534                 return -EBUSY;
6535
6536         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6537
6538         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6539                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6540                 if (err < 0) {
6541                         NL_SET_BAD_ATTR(extack, attr);
6542                         return err;
6543                 }
6544         }
6545
6546         if (table->validate_state == NFT_VALIDATE_DO)
6547                 return nft_table_validate(net, table);
6548
6549         return 0;
6550 }
6551
6552 /**
6553  *      nft_data_hold - hold a nft_data item
6554  *
6555  *      @data: struct nft_data to release
6556  *      @type: type of data
6557  *
6558  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6559  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6560  *      NFT_GOTO verdicts. This function must be called on active data objects
6561  *      from the second phase of the commit protocol.
6562  */
6563 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6564 {
6565         struct nft_chain *chain;
6566         struct nft_rule *rule;
6567
6568         if (type == NFT_DATA_VERDICT) {
6569                 switch (data->verdict.code) {
6570                 case NFT_JUMP:
6571                 case NFT_GOTO:
6572                         chain = data->verdict.chain;
6573                         chain->use++;
6574
6575                         if (!nft_chain_is_bound(chain))
6576                                 break;
6577
6578                         chain->table->use++;
6579                         list_for_each_entry(rule, &chain->rules, list)
6580                                 chain->use++;
6581
6582                         nft_chain_add(chain->table, chain);
6583                         break;
6584                 }
6585         }
6586 }
6587
6588 static void nft_setelem_data_activate(const struct net *net,
6589                                       const struct nft_set *set,
6590                                       struct nft_set_elem *elem)
6591 {
6592         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6593
6594         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6595                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6596         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6597                 (*nft_set_ext_obj(ext))->use++;
6598 }
6599
6600 static void nft_setelem_data_deactivate(const struct net *net,
6601                                         const struct nft_set *set,
6602                                         struct nft_set_elem *elem)
6603 {
6604         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6605
6606         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6607                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6608         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6609                 (*nft_set_ext_obj(ext))->use--;
6610 }
6611
6612 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6613                            const struct nlattr *attr)
6614 {
6615         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6616         struct nft_set_ext_tmpl tmpl;
6617         struct nft_set_elem elem;
6618         struct nft_set_ext *ext;
6619         struct nft_trans *trans;
6620         u32 flags = 0;
6621         int err;
6622
6623         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6624                                           nft_set_elem_policy, NULL);
6625         if (err < 0)
6626                 return err;
6627
6628         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6629         if (err < 0)
6630                 return err;
6631
6632         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6633                 return -EINVAL;
6634
6635         if (!nft_setelem_valid_key_end(set, nla, flags))
6636                 return -EINVAL;
6637
6638         nft_set_ext_prepare(&tmpl);
6639
6640         if (flags != 0) {
6641                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6642                 if (err < 0)
6643                         return err;
6644         }
6645
6646         if (nla[NFTA_SET_ELEM_KEY]) {
6647                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6648                                             nla[NFTA_SET_ELEM_KEY]);
6649                 if (err < 0)
6650                         return err;
6651
6652                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6653                 if (err < 0)
6654                         goto fail_elem;
6655         }
6656
6657         if (nla[NFTA_SET_ELEM_KEY_END]) {
6658                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6659                                             nla[NFTA_SET_ELEM_KEY_END]);
6660                 if (err < 0)
6661                         goto fail_elem;
6662
6663                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6664                 if (err < 0)
6665                         goto fail_elem_key_end;
6666         }
6667
6668         err = -ENOMEM;
6669         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6670                                       elem.key_end.val.data, NULL, 0, 0,
6671                                       GFP_KERNEL_ACCOUNT);
6672         if (IS_ERR(elem.priv)) {
6673                 err = PTR_ERR(elem.priv);
6674                 goto fail_elem_key_end;
6675         }
6676
6677         ext = nft_set_elem_ext(set, elem.priv);
6678         if (flags)
6679                 *nft_set_ext_flags(ext) = flags;
6680
6681         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6682         if (trans == NULL)
6683                 goto fail_trans;
6684
6685         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6686         if (err < 0)
6687                 goto fail_ops;
6688
6689         nft_setelem_data_deactivate(ctx->net, set, &elem);
6690
6691         nft_trans_elem(trans) = elem;
6692         nft_trans_commit_list_add_tail(ctx->net, trans);
6693         return 0;
6694
6695 fail_ops:
6696         kfree(trans);
6697 fail_trans:
6698         kfree(elem.priv);
6699 fail_elem_key_end:
6700         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6701 fail_elem:
6702         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6703         return err;
6704 }
6705
6706 static int nft_setelem_flush(const struct nft_ctx *ctx,
6707                              struct nft_set *set,
6708                              const struct nft_set_iter *iter,
6709                              struct nft_set_elem *elem)
6710 {
6711         struct nft_trans *trans;
6712         int err;
6713
6714         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6715                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
6716         if (!trans)
6717                 return -ENOMEM;
6718
6719         if (!set->ops->flush(ctx->net, set, elem->priv)) {
6720                 err = -ENOENT;
6721                 goto err1;
6722         }
6723         set->ndeact++;
6724
6725         nft_setelem_data_deactivate(ctx->net, set, elem);
6726         nft_trans_elem_set(trans) = set;
6727         nft_trans_elem(trans) = *elem;
6728         nft_trans_commit_list_add_tail(ctx->net, trans);
6729
6730         return 0;
6731 err1:
6732         kfree(trans);
6733         return err;
6734 }
6735
6736 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6737                                     struct nft_set *set,
6738                                     struct nft_set_elem *elem)
6739 {
6740         struct nft_trans *trans;
6741
6742         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6743                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
6744         if (!trans)
6745                 return -ENOMEM;
6746
6747         nft_setelem_data_deactivate(ctx->net, set, elem);
6748         nft_trans_elem_set(trans) = set;
6749         nft_trans_elem(trans) = *elem;
6750         nft_trans_commit_list_add_tail(ctx->net, trans);
6751
6752         return 0;
6753 }
6754
6755 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6756                                   struct nft_set *set)
6757 {
6758         u8 genmask = nft_genmask_next(ctx->net);
6759         struct nft_set_elem_catchall *catchall;
6760         struct nft_set_elem elem;
6761         struct nft_set_ext *ext;
6762         int ret = 0;
6763
6764         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6765                 ext = nft_set_elem_ext(set, catchall->elem);
6766                 if (!nft_set_elem_active(ext, genmask) ||
6767                     nft_set_elem_mark_busy(ext))
6768                         continue;
6769
6770                 elem.priv = catchall->elem;
6771                 ret = __nft_set_catchall_flush(ctx, set, &elem);
6772                 if (ret < 0)
6773                         break;
6774         }
6775
6776         return ret;
6777 }
6778
6779 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6780 {
6781         struct nft_set_iter iter = {
6782                 .genmask        = genmask,
6783                 .fn             = nft_setelem_flush,
6784         };
6785
6786         set->ops->walk(ctx, set, &iter);
6787         if (!iter.err)
6788                 iter.err = nft_set_catchall_flush(ctx, set);
6789
6790         return iter.err;
6791 }
6792
6793 static int nf_tables_delsetelem(struct sk_buff *skb,
6794                                 const struct nfnl_info *info,
6795                                 const struct nlattr * const nla[])
6796 {
6797         struct netlink_ext_ack *extack = info->extack;
6798         u8 genmask = nft_genmask_next(info->net);
6799         u8 family = info->nfmsg->nfgen_family;
6800         struct net *net = info->net;
6801         const struct nlattr *attr;
6802         struct nft_table *table;
6803         struct nft_set *set;
6804         struct nft_ctx ctx;
6805         int rem, err = 0;
6806
6807         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6808                                  genmask, NETLINK_CB(skb).portid);
6809         if (IS_ERR(table)) {
6810                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6811                 return PTR_ERR(table);
6812         }
6813
6814         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6815         if (IS_ERR(set))
6816                 return PTR_ERR(set);
6817         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6818                 return -EBUSY;
6819
6820         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6821
6822         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6823                 return nft_set_flush(&ctx, set, genmask);
6824
6825         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6826                 err = nft_del_setelem(&ctx, set, attr);
6827                 if (err == -ENOENT &&
6828                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
6829                         continue;
6830
6831                 if (err < 0) {
6832                         NL_SET_BAD_ATTR(extack, attr);
6833                         break;
6834                 }
6835         }
6836         return err;
6837 }
6838
6839 void nft_set_gc_batch_release(struct rcu_head *rcu)
6840 {
6841         struct nft_set_gc_batch *gcb;
6842         unsigned int i;
6843
6844         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6845         for (i = 0; i < gcb->head.cnt; i++)
6846                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6847         kfree(gcb);
6848 }
6849
6850 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6851                                                 gfp_t gfp)
6852 {
6853         struct nft_set_gc_batch *gcb;
6854
6855         gcb = kzalloc(sizeof(*gcb), gfp);
6856         if (gcb == NULL)
6857                 return gcb;
6858         gcb->head.set = set;
6859         return gcb;
6860 }
6861
6862 /*
6863  * Stateful objects
6864  */
6865
6866 /**
6867  *      nft_register_obj- register nf_tables stateful object type
6868  *      @obj_type: object type
6869  *
6870  *      Registers the object type for use with nf_tables. Returns zero on
6871  *      success or a negative errno code otherwise.
6872  */
6873 int nft_register_obj(struct nft_object_type *obj_type)
6874 {
6875         if (obj_type->type == NFT_OBJECT_UNSPEC)
6876                 return -EINVAL;
6877
6878         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6879         list_add_rcu(&obj_type->list, &nf_tables_objects);
6880         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6881         return 0;
6882 }
6883 EXPORT_SYMBOL_GPL(nft_register_obj);
6884
6885 /**
6886  *      nft_unregister_obj - unregister nf_tables object type
6887  *      @obj_type: object type
6888  *
6889  *      Unregisters the object type for use with nf_tables.
6890  */
6891 void nft_unregister_obj(struct nft_object_type *obj_type)
6892 {
6893         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6894         list_del_rcu(&obj_type->list);
6895         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6896 }
6897 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6898
6899 struct nft_object *nft_obj_lookup(const struct net *net,
6900                                   const struct nft_table *table,
6901                                   const struct nlattr *nla, u32 objtype,
6902                                   u8 genmask)
6903 {
6904         struct nft_object_hash_key k = { .table = table };
6905         char search[NFT_OBJ_MAXNAMELEN];
6906         struct rhlist_head *tmp, *list;
6907         struct nft_object *obj;
6908
6909         nla_strscpy(search, nla, sizeof(search));
6910         k.name = search;
6911
6912         WARN_ON_ONCE(!rcu_read_lock_held() &&
6913                      !lockdep_commit_lock_is_held(net));
6914
6915         rcu_read_lock();
6916         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6917         if (!list)
6918                 goto out;
6919
6920         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6921                 if (objtype == obj->ops->type->type &&
6922                     nft_active_genmask(obj, genmask)) {
6923                         rcu_read_unlock();
6924                         return obj;
6925                 }
6926         }
6927 out:
6928         rcu_read_unlock();
6929         return ERR_PTR(-ENOENT);
6930 }
6931 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6932
6933 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6934                                                   const struct nlattr *nla,
6935                                                   u32 objtype, u8 genmask)
6936 {
6937         struct nft_object *obj;
6938
6939         list_for_each_entry(obj, &table->objects, list) {
6940                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6941                     objtype == obj->ops->type->type &&
6942                     nft_active_genmask(obj, genmask))
6943                         return obj;
6944         }
6945         return ERR_PTR(-ENOENT);
6946 }
6947
6948 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6949         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
6950                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
6951         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
6952                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
6953         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
6954         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
6955         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
6956         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
6957                                     .len = NFT_USERDATA_MAXLEN },
6958 };
6959
6960 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6961                                        const struct nft_object_type *type,
6962                                        const struct nlattr *attr)
6963 {
6964         struct nlattr **tb;
6965         const struct nft_object_ops *ops;
6966         struct nft_object *obj;
6967         int err = -ENOMEM;
6968
6969         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6970         if (!tb)
6971                 goto err1;
6972
6973         if (attr) {
6974                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6975                                                   type->policy, NULL);
6976                 if (err < 0)
6977                         goto err2;
6978         } else {
6979                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6980         }
6981
6982         if (type->select_ops) {
6983                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6984                 if (IS_ERR(ops)) {
6985                         err = PTR_ERR(ops);
6986                         goto err2;
6987                 }
6988         } else {
6989                 ops = type->ops;
6990         }
6991
6992         err = -ENOMEM;
6993         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
6994         if (!obj)
6995                 goto err2;
6996
6997         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6998         if (err < 0)
6999                 goto err3;
7000
7001         obj->ops = ops;
7002
7003         kfree(tb);
7004         return obj;
7005 err3:
7006         kfree(obj);
7007 err2:
7008         kfree(tb);
7009 err1:
7010         return ERR_PTR(err);
7011 }
7012
7013 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7014                            struct nft_object *obj, bool reset)
7015 {
7016         struct nlattr *nest;
7017
7018         nest = nla_nest_start_noflag(skb, attr);
7019         if (!nest)
7020                 goto nla_put_failure;
7021         if (obj->ops->dump(skb, obj, reset) < 0)
7022                 goto nla_put_failure;
7023         nla_nest_end(skb, nest);
7024         return 0;
7025
7026 nla_put_failure:
7027         return -1;
7028 }
7029
7030 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
7031 {
7032         const struct nft_object_type *type;
7033
7034         list_for_each_entry(type, &nf_tables_objects, list) {
7035                 if (objtype == type->type)
7036                         return type;
7037         }
7038         return NULL;
7039 }
7040
7041 static const struct nft_object_type *
7042 nft_obj_type_get(struct net *net, u32 objtype)
7043 {
7044         const struct nft_object_type *type;
7045
7046         type = __nft_obj_type_get(objtype);
7047         if (type != NULL && try_module_get(type->owner))
7048                 return type;
7049
7050         lockdep_nfnl_nft_mutex_not_held();
7051 #ifdef CONFIG_MODULES
7052         if (type == NULL) {
7053                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7054                         return ERR_PTR(-EAGAIN);
7055         }
7056 #endif
7057         return ERR_PTR(-ENOENT);
7058 }
7059
7060 static int nf_tables_updobj(const struct nft_ctx *ctx,
7061                             const struct nft_object_type *type,
7062                             const struct nlattr *attr,
7063                             struct nft_object *obj)
7064 {
7065         struct nft_object *newobj;
7066         struct nft_trans *trans;
7067         int err = -ENOMEM;
7068
7069         if (!try_module_get(type->owner))
7070                 return -ENOENT;
7071
7072         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7073                                 sizeof(struct nft_trans_obj));
7074         if (!trans)
7075                 goto err_trans;
7076
7077         newobj = nft_obj_init(ctx, type, attr);
7078         if (IS_ERR(newobj)) {
7079                 err = PTR_ERR(newobj);
7080                 goto err_free_trans;
7081         }
7082
7083         nft_trans_obj(trans) = obj;
7084         nft_trans_obj_update(trans) = true;
7085         nft_trans_obj_newobj(trans) = newobj;
7086         nft_trans_commit_list_add_tail(ctx->net, trans);
7087
7088         return 0;
7089
7090 err_free_trans:
7091         kfree(trans);
7092 err_trans:
7093         module_put(type->owner);
7094         return err;
7095 }
7096
7097 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7098                             const struct nlattr * const nla[])
7099 {
7100         struct netlink_ext_ack *extack = info->extack;
7101         u8 genmask = nft_genmask_next(info->net);
7102         u8 family = info->nfmsg->nfgen_family;
7103         const struct nft_object_type *type;
7104         struct net *net = info->net;
7105         struct nft_table *table;
7106         struct nft_object *obj;
7107         struct nft_ctx ctx;
7108         u32 objtype;
7109         int err;
7110
7111         if (!nla[NFTA_OBJ_TYPE] ||
7112             !nla[NFTA_OBJ_NAME] ||
7113             !nla[NFTA_OBJ_DATA])
7114                 return -EINVAL;
7115
7116         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7117                                  NETLINK_CB(skb).portid);
7118         if (IS_ERR(table)) {
7119                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7120                 return PTR_ERR(table);
7121         }
7122
7123         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7124         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7125         if (IS_ERR(obj)) {
7126                 err = PTR_ERR(obj);
7127                 if (err != -ENOENT) {
7128                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7129                         return err;
7130                 }
7131         } else {
7132                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7133                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7134                         return -EEXIST;
7135                 }
7136                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7137                         return -EOPNOTSUPP;
7138
7139                 type = __nft_obj_type_get(objtype);
7140                 if (WARN_ON_ONCE(!type))
7141                         return -ENOENT;
7142
7143                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7144
7145                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7146         }
7147
7148         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7149
7150         type = nft_obj_type_get(net, objtype);
7151         if (IS_ERR(type))
7152                 return PTR_ERR(type);
7153
7154         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7155         if (IS_ERR(obj)) {
7156                 err = PTR_ERR(obj);
7157                 goto err_init;
7158         }
7159         obj->key.table = table;
7160         obj->handle = nf_tables_alloc_handle(table);
7161
7162         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7163         if (!obj->key.name) {
7164                 err = -ENOMEM;
7165                 goto err_strdup;
7166         }
7167
7168         if (nla[NFTA_OBJ_USERDATA]) {
7169                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7170                 if (obj->udata == NULL)
7171                         goto err_userdata;
7172
7173                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7174         }
7175
7176         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7177         if (err < 0)
7178                 goto err_trans;
7179
7180         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7181                               nft_objname_ht_params);
7182         if (err < 0)
7183                 goto err_obj_ht;
7184
7185         list_add_tail_rcu(&obj->list, &table->objects);
7186         table->use++;
7187         return 0;
7188 err_obj_ht:
7189         /* queued in transaction log */
7190         INIT_LIST_HEAD(&obj->list);
7191         return err;
7192 err_trans:
7193         kfree(obj->udata);
7194 err_userdata:
7195         kfree(obj->key.name);
7196 err_strdup:
7197         if (obj->ops->destroy)
7198                 obj->ops->destroy(&ctx, obj);
7199         kfree(obj);
7200 err_init:
7201         module_put(type->owner);
7202         return err;
7203 }
7204
7205 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7206                                    u32 portid, u32 seq, int event, u32 flags,
7207                                    int family, const struct nft_table *table,
7208                                    struct nft_object *obj, bool reset)
7209 {
7210         struct nlmsghdr *nlh;
7211
7212         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7213         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7214                            NFNETLINK_V0, nft_base_seq(net));
7215         if (!nlh)
7216                 goto nla_put_failure;
7217
7218         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7219             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7220             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7221                          NFTA_OBJ_PAD))
7222                 goto nla_put_failure;
7223
7224         if (event == NFT_MSG_DELOBJ) {
7225                 nlmsg_end(skb, nlh);
7226                 return 0;
7227         }
7228
7229         if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7230             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7231             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7232                 goto nla_put_failure;
7233
7234         if (obj->udata &&
7235             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7236                 goto nla_put_failure;
7237
7238         nlmsg_end(skb, nlh);
7239         return 0;
7240
7241 nla_put_failure:
7242         nlmsg_trim(skb, nlh);
7243         return -1;
7244 }
7245
7246 struct nft_obj_filter {
7247         char            *table;
7248         u32             type;
7249 };
7250
7251 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7252 {
7253         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7254         const struct nft_table *table;
7255         unsigned int idx = 0, s_idx = cb->args[0];
7256         struct nft_obj_filter *filter = cb->data;
7257         struct net *net = sock_net(skb->sk);
7258         int family = nfmsg->nfgen_family;
7259         struct nftables_pernet *nft_net;
7260         struct nft_object *obj;
7261         bool reset = false;
7262
7263         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7264                 reset = true;
7265
7266         rcu_read_lock();
7267         nft_net = nft_pernet(net);
7268         cb->seq = READ_ONCE(nft_net->base_seq);
7269
7270         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7271                 if (family != NFPROTO_UNSPEC && family != table->family)
7272                         continue;
7273
7274                 list_for_each_entry_rcu(obj, &table->objects, list) {
7275                         if (!nft_is_active(net, obj))
7276                                 goto cont;
7277                         if (idx < s_idx)
7278                                 goto cont;
7279                         if (idx > s_idx)
7280                                 memset(&cb->args[1], 0,
7281                                        sizeof(cb->args) - sizeof(cb->args[0]));
7282                         if (filter && filter->table &&
7283                             strcmp(filter->table, table->name))
7284                                 goto cont;
7285                         if (filter &&
7286                             filter->type != NFT_OBJECT_UNSPEC &&
7287                             obj->ops->type->type != filter->type)
7288                                 goto cont;
7289                         if (reset) {
7290                                 char *buf = kasprintf(GFP_ATOMIC,
7291                                                       "%s:%u",
7292                                                       table->name,
7293                                                       nft_net->base_seq);
7294
7295                                 audit_log_nfcfg(buf,
7296                                                 family,
7297                                                 obj->handle,
7298                                                 AUDIT_NFT_OP_OBJ_RESET,
7299                                                 GFP_ATOMIC);
7300                                 kfree(buf);
7301                         }
7302
7303                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7304                                                     cb->nlh->nlmsg_seq,
7305                                                     NFT_MSG_NEWOBJ,
7306                                                     NLM_F_MULTI | NLM_F_APPEND,
7307                                                     table->family, table,
7308                                                     obj, reset) < 0)
7309                                 goto done;
7310
7311                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7312 cont:
7313                         idx++;
7314                 }
7315         }
7316 done:
7317         rcu_read_unlock();
7318
7319         cb->args[0] = idx;
7320         return skb->len;
7321 }
7322
7323 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7324 {
7325         const struct nlattr * const *nla = cb->data;
7326         struct nft_obj_filter *filter = NULL;
7327
7328         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7329                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7330                 if (!filter)
7331                         return -ENOMEM;
7332
7333                 if (nla[NFTA_OBJ_TABLE]) {
7334                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7335                         if (!filter->table) {
7336                                 kfree(filter);
7337                                 return -ENOMEM;
7338                         }
7339                 }
7340
7341                 if (nla[NFTA_OBJ_TYPE])
7342                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7343         }
7344
7345         cb->data = filter;
7346         return 0;
7347 }
7348
7349 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7350 {
7351         struct nft_obj_filter *filter = cb->data;
7352
7353         if (filter) {
7354                 kfree(filter->table);
7355                 kfree(filter);
7356         }
7357
7358         return 0;
7359 }
7360
7361 /* called with rcu_read_lock held */
7362 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7363                             const struct nlattr * const nla[])
7364 {
7365         struct netlink_ext_ack *extack = info->extack;
7366         u8 genmask = nft_genmask_cur(info->net);
7367         u8 family = info->nfmsg->nfgen_family;
7368         const struct nft_table *table;
7369         struct net *net = info->net;
7370         struct nft_object *obj;
7371         struct sk_buff *skb2;
7372         bool reset = false;
7373         u32 objtype;
7374         int err;
7375
7376         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7377                 struct netlink_dump_control c = {
7378                         .start = nf_tables_dump_obj_start,
7379                         .dump = nf_tables_dump_obj,
7380                         .done = nf_tables_dump_obj_done,
7381                         .module = THIS_MODULE,
7382                         .data = (void *)nla,
7383                 };
7384
7385                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7386         }
7387
7388         if (!nla[NFTA_OBJ_NAME] ||
7389             !nla[NFTA_OBJ_TYPE])
7390                 return -EINVAL;
7391
7392         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7393         if (IS_ERR(table)) {
7394                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7395                 return PTR_ERR(table);
7396         }
7397
7398         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7399         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7400         if (IS_ERR(obj)) {
7401                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7402                 return PTR_ERR(obj);
7403         }
7404
7405         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7406         if (!skb2)
7407                 return -ENOMEM;
7408
7409         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7410                 reset = true;
7411
7412         if (reset) {
7413                 const struct nftables_pernet *nft_net;
7414                 char *buf;
7415
7416                 nft_net = nft_pernet(net);
7417                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7418
7419                 audit_log_nfcfg(buf,
7420                                 family,
7421                                 obj->handle,
7422                                 AUDIT_NFT_OP_OBJ_RESET,
7423                                 GFP_ATOMIC);
7424                 kfree(buf);
7425         }
7426
7427         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7428                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7429                                       family, table, obj, reset);
7430         if (err < 0)
7431                 goto err_fill_obj_info;
7432
7433         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7434
7435 err_fill_obj_info:
7436         kfree_skb(skb2);
7437         return err;
7438 }
7439
7440 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7441 {
7442         if (obj->ops->destroy)
7443                 obj->ops->destroy(ctx, obj);
7444
7445         module_put(obj->ops->type->owner);
7446         kfree(obj->key.name);
7447         kfree(obj->udata);
7448         kfree(obj);
7449 }
7450
7451 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7452                             const struct nlattr * const nla[])
7453 {
7454         struct netlink_ext_ack *extack = info->extack;
7455         u8 genmask = nft_genmask_next(info->net);
7456         u8 family = info->nfmsg->nfgen_family;
7457         struct net *net = info->net;
7458         const struct nlattr *attr;
7459         struct nft_table *table;
7460         struct nft_object *obj;
7461         struct nft_ctx ctx;
7462         u32 objtype;
7463
7464         if (!nla[NFTA_OBJ_TYPE] ||
7465             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7466                 return -EINVAL;
7467
7468         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7469                                  NETLINK_CB(skb).portid);
7470         if (IS_ERR(table)) {
7471                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7472                 return PTR_ERR(table);
7473         }
7474
7475         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7476         if (nla[NFTA_OBJ_HANDLE]) {
7477                 attr = nla[NFTA_OBJ_HANDLE];
7478                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7479         } else {
7480                 attr = nla[NFTA_OBJ_NAME];
7481                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7482         }
7483
7484         if (IS_ERR(obj)) {
7485                 if (PTR_ERR(obj) == -ENOENT &&
7486                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7487                         return 0;
7488
7489                 NL_SET_BAD_ATTR(extack, attr);
7490                 return PTR_ERR(obj);
7491         }
7492         if (obj->use > 0) {
7493                 NL_SET_BAD_ATTR(extack, attr);
7494                 return -EBUSY;
7495         }
7496
7497         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7498
7499         return nft_delobj(&ctx, obj);
7500 }
7501
7502 void nft_obj_notify(struct net *net, const struct nft_table *table,
7503                     struct nft_object *obj, u32 portid, u32 seq, int event,
7504                     u16 flags, int family, int report, gfp_t gfp)
7505 {
7506         struct nftables_pernet *nft_net = nft_pernet(net);
7507         struct sk_buff *skb;
7508         int err;
7509         char *buf = kasprintf(gfp, "%s:%u",
7510                               table->name, nft_net->base_seq);
7511
7512         audit_log_nfcfg(buf,
7513                         family,
7514                         obj->handle,
7515                         event == NFT_MSG_NEWOBJ ?
7516                                  AUDIT_NFT_OP_OBJ_REGISTER :
7517                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7518                         gfp);
7519         kfree(buf);
7520
7521         if (!report &&
7522             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7523                 return;
7524
7525         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7526         if (skb == NULL)
7527                 goto err;
7528
7529         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7530                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7531                                       family, table, obj, false);
7532         if (err < 0) {
7533                 kfree_skb(skb);
7534                 goto err;
7535         }
7536
7537         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7538         return;
7539 err:
7540         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7541 }
7542 EXPORT_SYMBOL_GPL(nft_obj_notify);
7543
7544 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7545                                  struct nft_object *obj, int event)
7546 {
7547         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7548                        ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7549 }
7550
7551 /*
7552  * Flow tables
7553  */
7554 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7555 {
7556         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7557         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7558         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7559 }
7560 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7561
7562 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7563 {
7564         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7565         list_del_rcu(&type->list);
7566         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7567 }
7568 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7569
7570 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7571         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7572                                             .len = NFT_NAME_MAXLEN - 1 },
7573         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7574                                             .len = NFT_NAME_MAXLEN - 1 },
7575         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7576         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7577         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7578 };
7579
7580 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7581                                            const struct nlattr *nla, u8 genmask)
7582 {
7583         struct nft_flowtable *flowtable;
7584
7585         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7586                 if (!nla_strcmp(nla, flowtable->name) &&
7587                     nft_active_genmask(flowtable, genmask))
7588                         return flowtable;
7589         }
7590         return ERR_PTR(-ENOENT);
7591 }
7592 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7593
7594 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7595                                     struct nft_flowtable *flowtable,
7596                                     enum nft_trans_phase phase)
7597 {
7598         switch (phase) {
7599         case NFT_TRANS_PREPARE:
7600         case NFT_TRANS_ABORT:
7601         case NFT_TRANS_RELEASE:
7602                 flowtable->use--;
7603                 fallthrough;
7604         default:
7605                 return;
7606         }
7607 }
7608 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7609
7610 static struct nft_flowtable *
7611 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7612                               const struct nlattr *nla, u8 genmask)
7613 {
7614        struct nft_flowtable *flowtable;
7615
7616        list_for_each_entry(flowtable, &table->flowtables, list) {
7617                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7618                    nft_active_genmask(flowtable, genmask))
7619                        return flowtable;
7620        }
7621        return ERR_PTR(-ENOENT);
7622 }
7623
7624 struct nft_flowtable_hook {
7625         u32                     num;
7626         int                     priority;
7627         struct list_head        list;
7628 };
7629
7630 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7631         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
7632         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
7633         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
7634 };
7635
7636 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7637                                     const struct nlattr *attr,
7638                                     struct nft_flowtable_hook *flowtable_hook,
7639                                     struct nft_flowtable *flowtable,
7640                                     struct netlink_ext_ack *extack, bool add)
7641 {
7642         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7643         struct nft_hook *hook;
7644         int hooknum, priority;
7645         int err;
7646
7647         INIT_LIST_HEAD(&flowtable_hook->list);
7648
7649         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7650                                           nft_flowtable_hook_policy, NULL);
7651         if (err < 0)
7652                 return err;
7653
7654         if (add) {
7655                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7656                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7657                         return -EINVAL;
7658
7659                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7660                 if (hooknum != NF_NETDEV_INGRESS)
7661                         return -EOPNOTSUPP;
7662
7663                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7664
7665                 flowtable_hook->priority        = priority;
7666                 flowtable_hook->num             = hooknum;
7667         } else {
7668                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7669                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7670                         if (hooknum != flowtable->hooknum)
7671                                 return -EOPNOTSUPP;
7672                 }
7673
7674                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7675                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7676                         if (priority != flowtable->data.priority)
7677                                 return -EOPNOTSUPP;
7678                 }
7679
7680                 flowtable_hook->priority        = flowtable->data.priority;
7681                 flowtable_hook->num             = flowtable->hooknum;
7682         }
7683
7684         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7685                 err = nf_tables_parse_netdev_hooks(ctx->net,
7686                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
7687                                                    &flowtable_hook->list,
7688                                                    extack);
7689                 if (err < 0)
7690                         return err;
7691         }
7692
7693         list_for_each_entry(hook, &flowtable_hook->list, list) {
7694                 hook->ops.pf            = NFPROTO_NETDEV;
7695                 hook->ops.hooknum       = flowtable_hook->num;
7696                 hook->ops.priority      = flowtable_hook->priority;
7697                 hook->ops.priv          = &flowtable->data;
7698                 hook->ops.hook          = flowtable->data.type->hook;
7699         }
7700
7701         return err;
7702 }
7703
7704 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7705 {
7706         const struct nf_flowtable_type *type;
7707
7708         list_for_each_entry(type, &nf_tables_flowtables, list) {
7709                 if (family == type->family)
7710                         return type;
7711         }
7712         return NULL;
7713 }
7714
7715 static const struct nf_flowtable_type *
7716 nft_flowtable_type_get(struct net *net, u8 family)
7717 {
7718         const struct nf_flowtable_type *type;
7719
7720         type = __nft_flowtable_type_get(family);
7721         if (type != NULL && try_module_get(type->owner))
7722                 return type;
7723
7724         lockdep_nfnl_nft_mutex_not_held();
7725 #ifdef CONFIG_MODULES
7726         if (type == NULL) {
7727                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7728                         return ERR_PTR(-EAGAIN);
7729         }
7730 #endif
7731         return ERR_PTR(-ENOENT);
7732 }
7733
7734 /* Only called from error and netdev event paths. */
7735 static void nft_unregister_flowtable_hook(struct net *net,
7736                                           struct nft_flowtable *flowtable,
7737                                           struct nft_hook *hook)
7738 {
7739         nf_unregister_net_hook(net, &hook->ops);
7740         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7741                                     FLOW_BLOCK_UNBIND);
7742 }
7743
7744 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7745                                                  struct list_head *hook_list,
7746                                                  bool release_netdev)
7747 {
7748         struct nft_hook *hook, *next;
7749
7750         list_for_each_entry_safe(hook, next, hook_list, list) {
7751                 nf_unregister_net_hook(net, &hook->ops);
7752                 if (release_netdev) {
7753                         list_del(&hook->list);
7754                         kfree_rcu(hook, rcu);
7755                 }
7756         }
7757 }
7758
7759 static void nft_unregister_flowtable_net_hooks(struct net *net,
7760                                                struct list_head *hook_list)
7761 {
7762         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7763 }
7764
7765 static int nft_register_flowtable_net_hooks(struct net *net,
7766                                             struct nft_table *table,
7767                                             struct list_head *hook_list,
7768                                             struct nft_flowtable *flowtable)
7769 {
7770         struct nft_hook *hook, *hook2, *next;
7771         struct nft_flowtable *ft;
7772         int err, i = 0;
7773
7774         list_for_each_entry(hook, hook_list, list) {
7775                 list_for_each_entry(ft, &table->flowtables, list) {
7776                         if (!nft_is_active_next(net, ft))
7777                                 continue;
7778
7779                         list_for_each_entry(hook2, &ft->hook_list, list) {
7780                                 if (hook->ops.dev == hook2->ops.dev &&
7781                                     hook->ops.pf == hook2->ops.pf) {
7782                                         err = -EEXIST;
7783                                         goto err_unregister_net_hooks;
7784                                 }
7785                         }
7786                 }
7787
7788                 err = flowtable->data.type->setup(&flowtable->data,
7789                                                   hook->ops.dev,
7790                                                   FLOW_BLOCK_BIND);
7791                 if (err < 0)
7792                         goto err_unregister_net_hooks;
7793
7794                 err = nf_register_net_hook(net, &hook->ops);
7795                 if (err < 0) {
7796                         flowtable->data.type->setup(&flowtable->data,
7797                                                     hook->ops.dev,
7798                                                     FLOW_BLOCK_UNBIND);
7799                         goto err_unregister_net_hooks;
7800                 }
7801
7802                 i++;
7803         }
7804
7805         return 0;
7806
7807 err_unregister_net_hooks:
7808         list_for_each_entry_safe(hook, next, hook_list, list) {
7809                 if (i-- <= 0)
7810                         break;
7811
7812                 nft_unregister_flowtable_hook(net, flowtable, hook);
7813                 list_del_rcu(&hook->list);
7814                 kfree_rcu(hook, rcu);
7815         }
7816
7817         return err;
7818 }
7819
7820 static void nft_hooks_destroy(struct list_head *hook_list)
7821 {
7822         struct nft_hook *hook, *next;
7823
7824         list_for_each_entry_safe(hook, next, hook_list, list) {
7825                 list_del_rcu(&hook->list);
7826                 kfree_rcu(hook, rcu);
7827         }
7828 }
7829
7830 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7831                                 struct nft_flowtable *flowtable,
7832                                 struct netlink_ext_ack *extack)
7833 {
7834         const struct nlattr * const *nla = ctx->nla;
7835         struct nft_flowtable_hook flowtable_hook;
7836         struct nft_hook *hook, *next;
7837         struct nft_trans *trans;
7838         bool unregister = false;
7839         u32 flags;
7840         int err;
7841
7842         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7843                                        &flowtable_hook, flowtable, extack, false);
7844         if (err < 0)
7845                 return err;
7846
7847         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7848                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7849                         list_del(&hook->list);
7850                         kfree(hook);
7851                 }
7852         }
7853
7854         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7855                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7856                 if (flags & ~NFT_FLOWTABLE_MASK) {
7857                         err = -EOPNOTSUPP;
7858                         goto err_flowtable_update_hook;
7859                 }
7860                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7861                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7862                         err = -EOPNOTSUPP;
7863                         goto err_flowtable_update_hook;
7864                 }
7865         } else {
7866                 flags = flowtable->data.flags;
7867         }
7868
7869         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7870                                                &flowtable_hook.list, flowtable);
7871         if (err < 0)
7872                 goto err_flowtable_update_hook;
7873
7874         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7875                                 sizeof(struct nft_trans_flowtable));
7876         if (!trans) {
7877                 unregister = true;
7878                 err = -ENOMEM;
7879                 goto err_flowtable_update_hook;
7880         }
7881
7882         nft_trans_flowtable_flags(trans) = flags;
7883         nft_trans_flowtable(trans) = flowtable;
7884         nft_trans_flowtable_update(trans) = true;
7885         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7886         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7887
7888         nft_trans_commit_list_add_tail(ctx->net, trans);
7889
7890         return 0;
7891
7892 err_flowtable_update_hook:
7893         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7894                 if (unregister)
7895                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7896                 list_del_rcu(&hook->list);
7897                 kfree_rcu(hook, rcu);
7898         }
7899
7900         return err;
7901
7902 }
7903
7904 static int nf_tables_newflowtable(struct sk_buff *skb,
7905                                   const struct nfnl_info *info,
7906                                   const struct nlattr * const nla[])
7907 {
7908         struct netlink_ext_ack *extack = info->extack;
7909         struct nft_flowtable_hook flowtable_hook;
7910         u8 genmask = nft_genmask_next(info->net);
7911         u8 family = info->nfmsg->nfgen_family;
7912         const struct nf_flowtable_type *type;
7913         struct nft_flowtable *flowtable;
7914         struct nft_hook *hook, *next;
7915         struct net *net = info->net;
7916         struct nft_table *table;
7917         struct nft_ctx ctx;
7918         int err;
7919
7920         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7921             !nla[NFTA_FLOWTABLE_NAME] ||
7922             !nla[NFTA_FLOWTABLE_HOOK])
7923                 return -EINVAL;
7924
7925         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7926                                  genmask, NETLINK_CB(skb).portid);
7927         if (IS_ERR(table)) {
7928                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7929                 return PTR_ERR(table);
7930         }
7931
7932         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7933                                          genmask);
7934         if (IS_ERR(flowtable)) {
7935                 err = PTR_ERR(flowtable);
7936                 if (err != -ENOENT) {
7937                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7938                         return err;
7939                 }
7940         } else {
7941                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7942                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7943                         return -EEXIST;
7944                 }
7945
7946                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7947
7948                 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
7949         }
7950
7951         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7952
7953         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
7954         if (!flowtable)
7955                 return -ENOMEM;
7956
7957         flowtable->table = table;
7958         flowtable->handle = nf_tables_alloc_handle(table);
7959         INIT_LIST_HEAD(&flowtable->hook_list);
7960
7961         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
7962         if (!flowtable->name) {
7963                 err = -ENOMEM;
7964                 goto err1;
7965         }
7966
7967         type = nft_flowtable_type_get(net, family);
7968         if (IS_ERR(type)) {
7969                 err = PTR_ERR(type);
7970                 goto err2;
7971         }
7972
7973         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7974                 flowtable->data.flags =
7975                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7976                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7977                         err = -EOPNOTSUPP;
7978                         goto err3;
7979                 }
7980         }
7981
7982         write_pnet(&flowtable->data.net, net);
7983         flowtable->data.type = type;
7984         err = type->init(&flowtable->data);
7985         if (err < 0)
7986                 goto err3;
7987
7988         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7989                                        &flowtable_hook, flowtable, extack, true);
7990         if (err < 0)
7991                 goto err4;
7992
7993         list_splice(&flowtable_hook.list, &flowtable->hook_list);
7994         flowtable->data.priority = flowtable_hook.priority;
7995         flowtable->hooknum = flowtable_hook.num;
7996
7997         err = nft_register_flowtable_net_hooks(ctx.net, table,
7998                                                &flowtable->hook_list,
7999                                                flowtable);
8000         if (err < 0) {
8001                 nft_hooks_destroy(&flowtable->hook_list);
8002                 goto err4;
8003         }
8004
8005         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8006         if (err < 0)
8007                 goto err5;
8008
8009         list_add_tail_rcu(&flowtable->list, &table->flowtables);
8010         table->use++;
8011
8012         return 0;
8013 err5:
8014         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8015                 nft_unregister_flowtable_hook(net, flowtable, hook);
8016                 list_del_rcu(&hook->list);
8017                 kfree_rcu(hook, rcu);
8018         }
8019 err4:
8020         flowtable->data.type->free(&flowtable->data);
8021 err3:
8022         module_put(type->owner);
8023 err2:
8024         kfree(flowtable->name);
8025 err1:
8026         kfree(flowtable);
8027         return err;
8028 }
8029
8030 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8031 {
8032         struct nft_hook *this, *next;
8033
8034         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8035                 list_del(&this->list);
8036                 kfree(this);
8037         }
8038 }
8039
8040 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8041                                  struct nft_flowtable *flowtable,
8042                                  struct netlink_ext_ack *extack)
8043 {
8044         const struct nlattr * const *nla = ctx->nla;
8045         struct nft_flowtable_hook flowtable_hook;
8046         LIST_HEAD(flowtable_del_list);
8047         struct nft_hook *this, *hook;
8048         struct nft_trans *trans;
8049         int err;
8050
8051         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
8052                                        &flowtable_hook, flowtable, extack, false);
8053         if (err < 0)
8054                 return err;
8055
8056         list_for_each_entry(this, &flowtable_hook.list, list) {
8057                 hook = nft_hook_list_find(&flowtable->hook_list, this);
8058                 if (!hook) {
8059                         err = -ENOENT;
8060                         goto err_flowtable_del_hook;
8061                 }
8062                 list_move(&hook->list, &flowtable_del_list);
8063         }
8064
8065         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8066                                 sizeof(struct nft_trans_flowtable));
8067         if (!trans) {
8068                 err = -ENOMEM;
8069                 goto err_flowtable_del_hook;
8070         }
8071
8072         nft_trans_flowtable(trans) = flowtable;
8073         nft_trans_flowtable_update(trans) = true;
8074         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8075         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8076         nft_flowtable_hook_release(&flowtable_hook);
8077
8078         nft_trans_commit_list_add_tail(ctx->net, trans);
8079
8080         return 0;
8081
8082 err_flowtable_del_hook:
8083         list_splice(&flowtable_del_list, &flowtable->hook_list);
8084         nft_flowtable_hook_release(&flowtable_hook);
8085
8086         return err;
8087 }
8088
8089 static int nf_tables_delflowtable(struct sk_buff *skb,
8090                                   const struct nfnl_info *info,
8091                                   const struct nlattr * const nla[])
8092 {
8093         struct netlink_ext_ack *extack = info->extack;
8094         u8 genmask = nft_genmask_next(info->net);
8095         u8 family = info->nfmsg->nfgen_family;
8096         struct nft_flowtable *flowtable;
8097         struct net *net = info->net;
8098         const struct nlattr *attr;
8099         struct nft_table *table;
8100         struct nft_ctx ctx;
8101
8102         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8103             (!nla[NFTA_FLOWTABLE_NAME] &&
8104              !nla[NFTA_FLOWTABLE_HANDLE]))
8105                 return -EINVAL;
8106
8107         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8108                                  genmask, NETLINK_CB(skb).portid);
8109         if (IS_ERR(table)) {
8110                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8111                 return PTR_ERR(table);
8112         }
8113
8114         if (nla[NFTA_FLOWTABLE_HANDLE]) {
8115                 attr = nla[NFTA_FLOWTABLE_HANDLE];
8116                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8117         } else {
8118                 attr = nla[NFTA_FLOWTABLE_NAME];
8119                 flowtable = nft_flowtable_lookup(table, attr, genmask);
8120         }
8121
8122         if (IS_ERR(flowtable)) {
8123                 if (PTR_ERR(flowtable) == -ENOENT &&
8124                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8125                         return 0;
8126
8127                 NL_SET_BAD_ATTR(extack, attr);
8128                 return PTR_ERR(flowtable);
8129         }
8130
8131         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8132
8133         if (nla[NFTA_FLOWTABLE_HOOK])
8134                 return nft_delflowtable_hook(&ctx, flowtable, extack);
8135
8136         if (flowtable->use > 0) {
8137                 NL_SET_BAD_ATTR(extack, attr);
8138                 return -EBUSY;
8139         }
8140
8141         return nft_delflowtable(&ctx, flowtable);
8142 }
8143
8144 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8145                                          u32 portid, u32 seq, int event,
8146                                          u32 flags, int family,
8147                                          struct nft_flowtable *flowtable,
8148                                          struct list_head *hook_list)
8149 {
8150         struct nlattr *nest, *nest_devs;
8151         struct nft_hook *hook;
8152         struct nlmsghdr *nlh;
8153
8154         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8155         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8156                            NFNETLINK_V0, nft_base_seq(net));
8157         if (!nlh)
8158                 goto nla_put_failure;
8159
8160         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8161             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8162             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8163                          NFTA_FLOWTABLE_PAD))
8164                 goto nla_put_failure;
8165
8166         if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8167                 nlmsg_end(skb, nlh);
8168                 return 0;
8169         }
8170
8171         if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8172             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8173                 goto nla_put_failure;
8174
8175         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8176         if (!nest)
8177                 goto nla_put_failure;
8178         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8179             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8180                 goto nla_put_failure;
8181
8182         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8183         if (!nest_devs)
8184                 goto nla_put_failure;
8185
8186         if (!hook_list)
8187                 hook_list = &flowtable->hook_list;
8188
8189         list_for_each_entry_rcu(hook, hook_list, list) {
8190                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8191                         goto nla_put_failure;
8192         }
8193         nla_nest_end(skb, nest_devs);
8194         nla_nest_end(skb, nest);
8195
8196         nlmsg_end(skb, nlh);
8197         return 0;
8198
8199 nla_put_failure:
8200         nlmsg_trim(skb, nlh);
8201         return -1;
8202 }
8203
8204 struct nft_flowtable_filter {
8205         char            *table;
8206 };
8207
8208 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8209                                     struct netlink_callback *cb)
8210 {
8211         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8212         struct nft_flowtable_filter *filter = cb->data;
8213         unsigned int idx = 0, s_idx = cb->args[0];
8214         struct net *net = sock_net(skb->sk);
8215         int family = nfmsg->nfgen_family;
8216         struct nft_flowtable *flowtable;
8217         struct nftables_pernet *nft_net;
8218         const struct nft_table *table;
8219
8220         rcu_read_lock();
8221         nft_net = nft_pernet(net);
8222         cb->seq = READ_ONCE(nft_net->base_seq);
8223
8224         list_for_each_entry_rcu(table, &nft_net->tables, list) {
8225                 if (family != NFPROTO_UNSPEC && family != table->family)
8226                         continue;
8227
8228                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8229                         if (!nft_is_active(net, flowtable))
8230                                 goto cont;
8231                         if (idx < s_idx)
8232                                 goto cont;
8233                         if (idx > s_idx)
8234                                 memset(&cb->args[1], 0,
8235                                        sizeof(cb->args) - sizeof(cb->args[0]));
8236                         if (filter && filter->table &&
8237                             strcmp(filter->table, table->name))
8238                                 goto cont;
8239
8240                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8241                                                           cb->nlh->nlmsg_seq,
8242                                                           NFT_MSG_NEWFLOWTABLE,
8243                                                           NLM_F_MULTI | NLM_F_APPEND,
8244                                                           table->family,
8245                                                           flowtable, NULL) < 0)
8246                                 goto done;
8247
8248                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8249 cont:
8250                         idx++;
8251                 }
8252         }
8253 done:
8254         rcu_read_unlock();
8255
8256         cb->args[0] = idx;
8257         return skb->len;
8258 }
8259
8260 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8261 {
8262         const struct nlattr * const *nla = cb->data;
8263         struct nft_flowtable_filter *filter = NULL;
8264
8265         if (nla[NFTA_FLOWTABLE_TABLE]) {
8266                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8267                 if (!filter)
8268                         return -ENOMEM;
8269
8270                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8271                                            GFP_ATOMIC);
8272                 if (!filter->table) {
8273                         kfree(filter);
8274                         return -ENOMEM;
8275                 }
8276         }
8277
8278         cb->data = filter;
8279         return 0;
8280 }
8281
8282 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8283 {
8284         struct nft_flowtable_filter *filter = cb->data;
8285
8286         if (!filter)
8287                 return 0;
8288
8289         kfree(filter->table);
8290         kfree(filter);
8291
8292         return 0;
8293 }
8294
8295 /* called with rcu_read_lock held */
8296 static int nf_tables_getflowtable(struct sk_buff *skb,
8297                                   const struct nfnl_info *info,
8298                                   const struct nlattr * const nla[])
8299 {
8300         u8 genmask = nft_genmask_cur(info->net);
8301         u8 family = info->nfmsg->nfgen_family;
8302         struct nft_flowtable *flowtable;
8303         const struct nft_table *table;
8304         struct net *net = info->net;
8305         struct sk_buff *skb2;
8306         int err;
8307
8308         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8309                 struct netlink_dump_control c = {
8310                         .start = nf_tables_dump_flowtable_start,
8311                         .dump = nf_tables_dump_flowtable,
8312                         .done = nf_tables_dump_flowtable_done,
8313                         .module = THIS_MODULE,
8314                         .data = (void *)nla,
8315                 };
8316
8317                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8318         }
8319
8320         if (!nla[NFTA_FLOWTABLE_NAME])
8321                 return -EINVAL;
8322
8323         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8324                                  genmask, 0);
8325         if (IS_ERR(table))
8326                 return PTR_ERR(table);
8327
8328         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8329                                          genmask);
8330         if (IS_ERR(flowtable))
8331                 return PTR_ERR(flowtable);
8332
8333         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8334         if (!skb2)
8335                 return -ENOMEM;
8336
8337         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8338                                             info->nlh->nlmsg_seq,
8339                                             NFT_MSG_NEWFLOWTABLE, 0, family,
8340                                             flowtable, NULL);
8341         if (err < 0)
8342                 goto err_fill_flowtable_info;
8343
8344         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8345
8346 err_fill_flowtable_info:
8347         kfree_skb(skb2);
8348         return err;
8349 }
8350
8351 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8352                                        struct nft_flowtable *flowtable,
8353                                        struct list_head *hook_list, int event)
8354 {
8355         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8356         struct sk_buff *skb;
8357         u16 flags = 0;
8358         int err;
8359
8360         if (!ctx->report &&
8361             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8362                 return;
8363
8364         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8365         if (skb == NULL)
8366                 goto err;
8367
8368         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8369                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8370
8371         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8372                                             ctx->seq, event, flags,
8373                                             ctx->family, flowtable, hook_list);
8374         if (err < 0) {
8375                 kfree_skb(skb);
8376                 goto err;
8377         }
8378
8379         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8380         return;
8381 err:
8382         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8383 }
8384
8385 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8386 {
8387         struct nft_hook *hook, *next;
8388
8389         flowtable->data.type->free(&flowtable->data);
8390         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8391                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8392                                             FLOW_BLOCK_UNBIND);
8393                 list_del_rcu(&hook->list);
8394                 kfree(hook);
8395         }
8396         kfree(flowtable->name);
8397         module_put(flowtable->data.type->owner);
8398         kfree(flowtable);
8399 }
8400
8401 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8402                                    u32 portid, u32 seq)
8403 {
8404         struct nftables_pernet *nft_net = nft_pernet(net);
8405         struct nlmsghdr *nlh;
8406         char buf[TASK_COMM_LEN];
8407         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8408
8409         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8410                            NFNETLINK_V0, nft_base_seq(net));
8411         if (!nlh)
8412                 goto nla_put_failure;
8413
8414         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8415             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8416             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8417                 goto nla_put_failure;
8418
8419         nlmsg_end(skb, nlh);
8420         return 0;
8421
8422 nla_put_failure:
8423         nlmsg_trim(skb, nlh);
8424         return -EMSGSIZE;
8425 }
8426
8427 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8428                                 struct nft_flowtable *flowtable)
8429 {
8430         struct nft_hook *hook;
8431
8432         list_for_each_entry(hook, &flowtable->hook_list, list) {
8433                 if (hook->ops.dev != dev)
8434                         continue;
8435
8436                 /* flow_offload_netdev_event() cleans up entries for us. */
8437                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8438                 list_del_rcu(&hook->list);
8439                 kfree_rcu(hook, rcu);
8440                 break;
8441         }
8442 }
8443
8444 static int nf_tables_flowtable_event(struct notifier_block *this,
8445                                      unsigned long event, void *ptr)
8446 {
8447         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8448         struct nft_flowtable *flowtable;
8449         struct nftables_pernet *nft_net;
8450         struct nft_table *table;
8451         struct net *net;
8452
8453         if (event != NETDEV_UNREGISTER)
8454                 return 0;
8455
8456         net = dev_net(dev);
8457         nft_net = nft_pernet(net);
8458         mutex_lock(&nft_net->commit_mutex);
8459         list_for_each_entry(table, &nft_net->tables, list) {
8460                 list_for_each_entry(flowtable, &table->flowtables, list) {
8461                         nft_flowtable_event(event, dev, flowtable);
8462                 }
8463         }
8464         mutex_unlock(&nft_net->commit_mutex);
8465
8466         return NOTIFY_DONE;
8467 }
8468
8469 static struct notifier_block nf_tables_flowtable_notifier = {
8470         .notifier_call  = nf_tables_flowtable_event,
8471 };
8472
8473 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8474                                  int event)
8475 {
8476         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8477         struct sk_buff *skb2;
8478         int err;
8479
8480         if (!nlmsg_report(nlh) &&
8481             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8482                 return;
8483
8484         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8485         if (skb2 == NULL)
8486                 goto err;
8487
8488         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8489                                       nlh->nlmsg_seq);
8490         if (err < 0) {
8491                 kfree_skb(skb2);
8492                 goto err;
8493         }
8494
8495         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8496                        nlmsg_report(nlh), GFP_KERNEL);
8497         return;
8498 err:
8499         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8500                           -ENOBUFS);
8501 }
8502
8503 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8504                             const struct nlattr * const nla[])
8505 {
8506         struct sk_buff *skb2;
8507         int err;
8508
8509         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8510         if (skb2 == NULL)
8511                 return -ENOMEM;
8512
8513         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8514                                       info->nlh->nlmsg_seq);
8515         if (err < 0)
8516                 goto err_fill_gen_info;
8517
8518         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8519
8520 err_fill_gen_info:
8521         kfree_skb(skb2);
8522         return err;
8523 }
8524
8525 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8526         [NFT_MSG_NEWTABLE] = {
8527                 .call           = nf_tables_newtable,
8528                 .type           = NFNL_CB_BATCH,
8529                 .attr_count     = NFTA_TABLE_MAX,
8530                 .policy         = nft_table_policy,
8531         },
8532         [NFT_MSG_GETTABLE] = {
8533                 .call           = nf_tables_gettable,
8534                 .type           = NFNL_CB_RCU,
8535                 .attr_count     = NFTA_TABLE_MAX,
8536                 .policy         = nft_table_policy,
8537         },
8538         [NFT_MSG_DELTABLE] = {
8539                 .call           = nf_tables_deltable,
8540                 .type           = NFNL_CB_BATCH,
8541                 .attr_count     = NFTA_TABLE_MAX,
8542                 .policy         = nft_table_policy,
8543         },
8544         [NFT_MSG_DESTROYTABLE] = {
8545                 .call           = nf_tables_deltable,
8546                 .type           = NFNL_CB_BATCH,
8547                 .attr_count     = NFTA_TABLE_MAX,
8548                 .policy         = nft_table_policy,
8549         },
8550         [NFT_MSG_NEWCHAIN] = {
8551                 .call           = nf_tables_newchain,
8552                 .type           = NFNL_CB_BATCH,
8553                 .attr_count     = NFTA_CHAIN_MAX,
8554                 .policy         = nft_chain_policy,
8555         },
8556         [NFT_MSG_GETCHAIN] = {
8557                 .call           = nf_tables_getchain,
8558                 .type           = NFNL_CB_RCU,
8559                 .attr_count     = NFTA_CHAIN_MAX,
8560                 .policy         = nft_chain_policy,
8561         },
8562         [NFT_MSG_DELCHAIN] = {
8563                 .call           = nf_tables_delchain,
8564                 .type           = NFNL_CB_BATCH,
8565                 .attr_count     = NFTA_CHAIN_MAX,
8566                 .policy         = nft_chain_policy,
8567         },
8568         [NFT_MSG_DESTROYCHAIN] = {
8569                 .call           = nf_tables_delchain,
8570                 .type           = NFNL_CB_BATCH,
8571                 .attr_count     = NFTA_CHAIN_MAX,
8572                 .policy         = nft_chain_policy,
8573         },
8574         [NFT_MSG_NEWRULE] = {
8575                 .call           = nf_tables_newrule,
8576                 .type           = NFNL_CB_BATCH,
8577                 .attr_count     = NFTA_RULE_MAX,
8578                 .policy         = nft_rule_policy,
8579         },
8580         [NFT_MSG_GETRULE] = {
8581                 .call           = nf_tables_getrule,
8582                 .type           = NFNL_CB_RCU,
8583                 .attr_count     = NFTA_RULE_MAX,
8584                 .policy         = nft_rule_policy,
8585         },
8586         [NFT_MSG_GETRULE_RESET] = {
8587                 .call           = nf_tables_getrule,
8588                 .type           = NFNL_CB_RCU,
8589                 .attr_count     = NFTA_RULE_MAX,
8590                 .policy         = nft_rule_policy,
8591         },
8592         [NFT_MSG_DELRULE] = {
8593                 .call           = nf_tables_delrule,
8594                 .type           = NFNL_CB_BATCH,
8595                 .attr_count     = NFTA_RULE_MAX,
8596                 .policy         = nft_rule_policy,
8597         },
8598         [NFT_MSG_DESTROYRULE] = {
8599                 .call           = nf_tables_delrule,
8600                 .type           = NFNL_CB_BATCH,
8601                 .attr_count     = NFTA_RULE_MAX,
8602                 .policy         = nft_rule_policy,
8603         },
8604         [NFT_MSG_NEWSET] = {
8605                 .call           = nf_tables_newset,
8606                 .type           = NFNL_CB_BATCH,
8607                 .attr_count     = NFTA_SET_MAX,
8608                 .policy         = nft_set_policy,
8609         },
8610         [NFT_MSG_GETSET] = {
8611                 .call           = nf_tables_getset,
8612                 .type           = NFNL_CB_RCU,
8613                 .attr_count     = NFTA_SET_MAX,
8614                 .policy         = nft_set_policy,
8615         },
8616         [NFT_MSG_DELSET] = {
8617                 .call           = nf_tables_delset,
8618                 .type           = NFNL_CB_BATCH,
8619                 .attr_count     = NFTA_SET_MAX,
8620                 .policy         = nft_set_policy,
8621         },
8622         [NFT_MSG_DESTROYSET] = {
8623                 .call           = nf_tables_delset,
8624                 .type           = NFNL_CB_BATCH,
8625                 .attr_count     = NFTA_SET_MAX,
8626                 .policy         = nft_set_policy,
8627         },
8628         [NFT_MSG_NEWSETELEM] = {
8629                 .call           = nf_tables_newsetelem,
8630                 .type           = NFNL_CB_BATCH,
8631                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8632                 .policy         = nft_set_elem_list_policy,
8633         },
8634         [NFT_MSG_GETSETELEM] = {
8635                 .call           = nf_tables_getsetelem,
8636                 .type           = NFNL_CB_RCU,
8637                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8638                 .policy         = nft_set_elem_list_policy,
8639         },
8640         [NFT_MSG_DELSETELEM] = {
8641                 .call           = nf_tables_delsetelem,
8642                 .type           = NFNL_CB_BATCH,
8643                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8644                 .policy         = nft_set_elem_list_policy,
8645         },
8646         [NFT_MSG_DESTROYSETELEM] = {
8647                 .call           = nf_tables_delsetelem,
8648                 .type           = NFNL_CB_BATCH,
8649                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8650                 .policy         = nft_set_elem_list_policy,
8651         },
8652         [NFT_MSG_GETGEN] = {
8653                 .call           = nf_tables_getgen,
8654                 .type           = NFNL_CB_RCU,
8655         },
8656         [NFT_MSG_NEWOBJ] = {
8657                 .call           = nf_tables_newobj,
8658                 .type           = NFNL_CB_BATCH,
8659                 .attr_count     = NFTA_OBJ_MAX,
8660                 .policy         = nft_obj_policy,
8661         },
8662         [NFT_MSG_GETOBJ] = {
8663                 .call           = nf_tables_getobj,
8664                 .type           = NFNL_CB_RCU,
8665                 .attr_count     = NFTA_OBJ_MAX,
8666                 .policy         = nft_obj_policy,
8667         },
8668         [NFT_MSG_DELOBJ] = {
8669                 .call           = nf_tables_delobj,
8670                 .type           = NFNL_CB_BATCH,
8671                 .attr_count     = NFTA_OBJ_MAX,
8672                 .policy         = nft_obj_policy,
8673         },
8674         [NFT_MSG_DESTROYOBJ] = {
8675                 .call           = nf_tables_delobj,
8676                 .type           = NFNL_CB_BATCH,
8677                 .attr_count     = NFTA_OBJ_MAX,
8678                 .policy         = nft_obj_policy,
8679         },
8680         [NFT_MSG_GETOBJ_RESET] = {
8681                 .call           = nf_tables_getobj,
8682                 .type           = NFNL_CB_RCU,
8683                 .attr_count     = NFTA_OBJ_MAX,
8684                 .policy         = nft_obj_policy,
8685         },
8686         [NFT_MSG_NEWFLOWTABLE] = {
8687                 .call           = nf_tables_newflowtable,
8688                 .type           = NFNL_CB_BATCH,
8689                 .attr_count     = NFTA_FLOWTABLE_MAX,
8690                 .policy         = nft_flowtable_policy,
8691         },
8692         [NFT_MSG_GETFLOWTABLE] = {
8693                 .call           = nf_tables_getflowtable,
8694                 .type           = NFNL_CB_RCU,
8695                 .attr_count     = NFTA_FLOWTABLE_MAX,
8696                 .policy         = nft_flowtable_policy,
8697         },
8698         [NFT_MSG_DELFLOWTABLE] = {
8699                 .call           = nf_tables_delflowtable,
8700                 .type           = NFNL_CB_BATCH,
8701                 .attr_count     = NFTA_FLOWTABLE_MAX,
8702                 .policy         = nft_flowtable_policy,
8703         },
8704         [NFT_MSG_DESTROYFLOWTABLE] = {
8705                 .call           = nf_tables_delflowtable,
8706                 .type           = NFNL_CB_BATCH,
8707                 .attr_count     = NFTA_FLOWTABLE_MAX,
8708                 .policy         = nft_flowtable_policy,
8709         },
8710 };
8711
8712 static int nf_tables_validate(struct net *net)
8713 {
8714         struct nftables_pernet *nft_net = nft_pernet(net);
8715         struct nft_table *table;
8716
8717         list_for_each_entry(table, &nft_net->tables, list) {
8718                 switch (table->validate_state) {
8719                 case NFT_VALIDATE_SKIP:
8720                         continue;
8721                 case NFT_VALIDATE_NEED:
8722                         nft_validate_state_update(table, NFT_VALIDATE_DO);
8723                         fallthrough;
8724                 case NFT_VALIDATE_DO:
8725                         if (nft_table_validate(net, table) < 0)
8726                                 return -EAGAIN;
8727
8728                         nft_validate_state_update(table, NFT_VALIDATE_SKIP);
8729                 }
8730
8731                 break;
8732         }
8733
8734         return 0;
8735 }
8736
8737 /* a drop policy has to be deferred until all rules have been activated,
8738  * otherwise a large ruleset that contains a drop-policy base chain will
8739  * cause all packets to get dropped until the full transaction has been
8740  * processed.
8741  *
8742  * We defer the drop policy until the transaction has been finalized.
8743  */
8744 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8745 {
8746         struct nft_base_chain *basechain;
8747
8748         if (nft_trans_chain_policy(trans) != NF_DROP)
8749                 return;
8750
8751         if (!nft_is_base_chain(trans->ctx.chain))
8752                 return;
8753
8754         basechain = nft_base_chain(trans->ctx.chain);
8755         basechain->policy = NF_DROP;
8756 }
8757
8758 static void nft_chain_commit_update(struct nft_trans *trans)
8759 {
8760         struct nft_base_chain *basechain;
8761
8762         if (nft_trans_chain_name(trans)) {
8763                 rhltable_remove(&trans->ctx.table->chains_ht,
8764                                 &trans->ctx.chain->rhlhead,
8765                                 nft_chain_ht_params);
8766                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8767                 rhltable_insert_key(&trans->ctx.table->chains_ht,
8768                                     trans->ctx.chain->name,
8769                                     &trans->ctx.chain->rhlhead,
8770                                     nft_chain_ht_params);
8771         }
8772
8773         if (!nft_is_base_chain(trans->ctx.chain))
8774                 return;
8775
8776         nft_chain_stats_replace(trans);
8777
8778         basechain = nft_base_chain(trans->ctx.chain);
8779
8780         switch (nft_trans_chain_policy(trans)) {
8781         case NF_DROP:
8782         case NF_ACCEPT:
8783                 basechain->policy = nft_trans_chain_policy(trans);
8784                 break;
8785         }
8786 }
8787
8788 static void nft_obj_commit_update(struct nft_trans *trans)
8789 {
8790         struct nft_object *newobj;
8791         struct nft_object *obj;
8792
8793         obj = nft_trans_obj(trans);
8794         newobj = nft_trans_obj_newobj(trans);
8795
8796         if (obj->ops->update)
8797                 obj->ops->update(obj, newobj);
8798
8799         nft_obj_destroy(&trans->ctx, newobj);
8800 }
8801
8802 static void nft_commit_release(struct nft_trans *trans)
8803 {
8804         switch (trans->msg_type) {
8805         case NFT_MSG_DELTABLE:
8806         case NFT_MSG_DESTROYTABLE:
8807                 nf_tables_table_destroy(&trans->ctx);
8808                 break;
8809         case NFT_MSG_NEWCHAIN:
8810                 free_percpu(nft_trans_chain_stats(trans));
8811                 kfree(nft_trans_chain_name(trans));
8812                 break;
8813         case NFT_MSG_DELCHAIN:
8814         case NFT_MSG_DESTROYCHAIN:
8815                 nf_tables_chain_destroy(&trans->ctx);
8816                 break;
8817         case NFT_MSG_DELRULE:
8818         case NFT_MSG_DESTROYRULE:
8819                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8820                 break;
8821         case NFT_MSG_DELSET:
8822         case NFT_MSG_DESTROYSET:
8823                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8824                 break;
8825         case NFT_MSG_DELSETELEM:
8826         case NFT_MSG_DESTROYSETELEM:
8827                 nf_tables_set_elem_destroy(&trans->ctx,
8828                                            nft_trans_elem_set(trans),
8829                                            nft_trans_elem(trans).priv);
8830                 break;
8831         case NFT_MSG_DELOBJ:
8832         case NFT_MSG_DESTROYOBJ:
8833                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8834                 break;
8835         case NFT_MSG_DELFLOWTABLE:
8836         case NFT_MSG_DESTROYFLOWTABLE:
8837                 if (nft_trans_flowtable_update(trans))
8838                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8839                 else
8840                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8841                 break;
8842         }
8843
8844         if (trans->put_net)
8845                 put_net(trans->ctx.net);
8846
8847         kfree(trans);
8848 }
8849
8850 static void nf_tables_trans_destroy_work(struct work_struct *w)
8851 {
8852         struct nft_trans *trans, *next;
8853         LIST_HEAD(head);
8854
8855         spin_lock(&nf_tables_destroy_list_lock);
8856         list_splice_init(&nf_tables_destroy_list, &head);
8857         spin_unlock(&nf_tables_destroy_list_lock);
8858
8859         if (list_empty(&head))
8860                 return;
8861
8862         synchronize_rcu();
8863
8864         list_for_each_entry_safe(trans, next, &head, list) {
8865                 list_del(&trans->list);
8866                 nft_commit_release(trans);
8867         }
8868 }
8869
8870 void nf_tables_trans_destroy_flush_work(void)
8871 {
8872         flush_work(&trans_destroy_work);
8873 }
8874 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8875
8876 static bool nft_expr_reduce(struct nft_regs_track *track,
8877                             const struct nft_expr *expr)
8878 {
8879         return false;
8880 }
8881
8882 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8883 {
8884         const struct nft_expr *expr, *last;
8885         struct nft_regs_track track = {};
8886         unsigned int size, data_size;
8887         void *data, *data_boundary;
8888         struct nft_rule_dp *prule;
8889         struct nft_rule *rule;
8890
8891         /* already handled or inactive chain? */
8892         if (chain->blob_next || !nft_is_active_next(net, chain))
8893                 return 0;
8894
8895         data_size = 0;
8896         list_for_each_entry(rule, &chain->rules, list) {
8897                 if (nft_is_active_next(net, rule)) {
8898                         data_size += sizeof(*prule) + rule->dlen;
8899                         if (data_size > INT_MAX)
8900                                 return -ENOMEM;
8901                 }
8902         }
8903
8904         chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
8905         if (!chain->blob_next)
8906                 return -ENOMEM;
8907
8908         data = (void *)chain->blob_next->data;
8909         data_boundary = data + data_size;
8910         size = 0;
8911
8912         list_for_each_entry(rule, &chain->rules, list) {
8913                 if (!nft_is_active_next(net, rule))
8914                         continue;
8915
8916                 prule = (struct nft_rule_dp *)data;
8917                 data += offsetof(struct nft_rule_dp, data);
8918                 if (WARN_ON_ONCE(data > data_boundary))
8919                         return -ENOMEM;
8920
8921                 size = 0;
8922                 track.last = nft_expr_last(rule);
8923                 nft_rule_for_each_expr(expr, last, rule) {
8924                         track.cur = expr;
8925
8926                         if (nft_expr_reduce(&track, expr)) {
8927                                 expr = track.cur;
8928                                 continue;
8929                         }
8930
8931                         if (WARN_ON_ONCE(data + expr->ops->size > data_boundary))
8932                                 return -ENOMEM;
8933
8934                         memcpy(data + size, expr, expr->ops->size);
8935                         size += expr->ops->size;
8936                 }
8937                 if (WARN_ON_ONCE(size >= 1 << 12))
8938                         return -ENOMEM;
8939
8940                 prule->handle = rule->handle;
8941                 prule->dlen = size;
8942                 prule->is_last = 0;
8943
8944                 data += size;
8945                 size = 0;
8946                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
8947         }
8948
8949         if (WARN_ON_ONCE(data > data_boundary))
8950                 return -ENOMEM;
8951
8952         prule = (struct nft_rule_dp *)data;
8953         nft_last_rule(chain, prule);
8954
8955         return 0;
8956 }
8957
8958 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8959 {
8960         struct nftables_pernet *nft_net = nft_pernet(net);
8961         struct nft_trans *trans, *next;
8962
8963         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8964                 struct nft_chain *chain = trans->ctx.chain;
8965
8966                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8967                     trans->msg_type == NFT_MSG_DELRULE) {
8968                         kvfree(chain->blob_next);
8969                         chain->blob_next = NULL;
8970                 }
8971         }
8972 }
8973
8974 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
8975 {
8976         struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
8977
8978         kvfree(l->blob);
8979 }
8980
8981 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
8982 {
8983         struct nft_rule_dp_last *last;
8984
8985         /* last rule trailer is after end marker */
8986         last = (void *)blob + sizeof(*blob) + blob->size;
8987         last->blob = blob;
8988
8989         call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
8990 }
8991
8992 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8993 {
8994         struct nft_rule_blob *g0, *g1;
8995         bool next_genbit;
8996
8997         next_genbit = nft_gencursor_next(net);
8998
8999         g0 = rcu_dereference_protected(chain->blob_gen_0,
9000                                        lockdep_commit_lock_is_held(net));
9001         g1 = rcu_dereference_protected(chain->blob_gen_1,
9002                                        lockdep_commit_lock_is_held(net));
9003
9004         /* No changes to this chain? */
9005         if (chain->blob_next == NULL) {
9006                 /* chain had no change in last or next generation */
9007                 if (g0 == g1)
9008                         return;
9009                 /*
9010                  * chain had no change in this generation; make sure next
9011                  * one uses same rules as current generation.
9012                  */
9013                 if (next_genbit) {
9014                         rcu_assign_pointer(chain->blob_gen_1, g0);
9015                         nf_tables_commit_chain_free_rules_old(g1);
9016                 } else {
9017                         rcu_assign_pointer(chain->blob_gen_0, g1);
9018                         nf_tables_commit_chain_free_rules_old(g0);
9019                 }
9020
9021                 return;
9022         }
9023
9024         if (next_genbit)
9025                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9026         else
9027                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9028
9029         chain->blob_next = NULL;
9030
9031         if (g0 == g1)
9032                 return;
9033
9034         if (next_genbit)
9035                 nf_tables_commit_chain_free_rules_old(g1);
9036         else
9037                 nf_tables_commit_chain_free_rules_old(g0);
9038 }
9039
9040 static void nft_obj_del(struct nft_object *obj)
9041 {
9042         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9043         list_del_rcu(&obj->list);
9044 }
9045
9046 void nft_chain_del(struct nft_chain *chain)
9047 {
9048         struct nft_table *table = chain->table;
9049
9050         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9051                                      nft_chain_ht_params));
9052         list_del_rcu(&chain->list);
9053 }
9054
9055 static void nf_tables_module_autoload_cleanup(struct net *net)
9056 {
9057         struct nftables_pernet *nft_net = nft_pernet(net);
9058         struct nft_module_request *req, *next;
9059
9060         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9061         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9062                 WARN_ON_ONCE(!req->done);
9063                 list_del(&req->list);
9064                 kfree(req);
9065         }
9066 }
9067
9068 static void nf_tables_commit_release(struct net *net)
9069 {
9070         struct nftables_pernet *nft_net = nft_pernet(net);
9071         struct nft_trans *trans;
9072
9073         /* all side effects have to be made visible.
9074          * For example, if a chain named 'foo' has been deleted, a
9075          * new transaction must not find it anymore.
9076          *
9077          * Memory reclaim happens asynchronously from work queue
9078          * to prevent expensive synchronize_rcu() in commit phase.
9079          */
9080         if (list_empty(&nft_net->commit_list)) {
9081                 nf_tables_module_autoload_cleanup(net);
9082                 mutex_unlock(&nft_net->commit_mutex);
9083                 return;
9084         }
9085
9086         trans = list_last_entry(&nft_net->commit_list,
9087                                 struct nft_trans, list);
9088         get_net(trans->ctx.net);
9089         WARN_ON_ONCE(trans->put_net);
9090
9091         trans->put_net = true;
9092         spin_lock(&nf_tables_destroy_list_lock);
9093         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9094         spin_unlock(&nf_tables_destroy_list_lock);
9095
9096         nf_tables_module_autoload_cleanup(net);
9097         schedule_work(&trans_destroy_work);
9098
9099         mutex_unlock(&nft_net->commit_mutex);
9100 }
9101
9102 static void nft_commit_notify(struct net *net, u32 portid)
9103 {
9104         struct nftables_pernet *nft_net = nft_pernet(net);
9105         struct sk_buff *batch_skb = NULL, *nskb, *skb;
9106         unsigned char *data;
9107         int len;
9108
9109         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9110                 if (!batch_skb) {
9111 new_batch:
9112                         batch_skb = skb;
9113                         len = NLMSG_GOODSIZE - skb->len;
9114                         list_del(&skb->list);
9115                         continue;
9116                 }
9117                 len -= skb->len;
9118                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9119                         data = skb_put(batch_skb, skb->len);
9120                         memcpy(data, skb->data, skb->len);
9121                         list_del(&skb->list);
9122                         kfree_skb(skb);
9123                         continue;
9124                 }
9125                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9126                                NFT_CB(batch_skb).report, GFP_KERNEL);
9127                 goto new_batch;
9128         }
9129
9130         if (batch_skb) {
9131                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9132                                NFT_CB(batch_skb).report, GFP_KERNEL);
9133         }
9134
9135         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9136 }
9137
9138 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9139                                         struct nft_table *table)
9140 {
9141         struct nft_audit_data *adp;
9142
9143         list_for_each_entry(adp, adl, list) {
9144                 if (adp->table == table)
9145                         return 0;
9146         }
9147         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9148         if (!adp)
9149                 return -ENOMEM;
9150         adp->table = table;
9151         list_add(&adp->list, adl);
9152         return 0;
9153 }
9154
9155 static void nf_tables_commit_audit_free(struct list_head *adl)
9156 {
9157         struct nft_audit_data *adp, *adn;
9158
9159         list_for_each_entry_safe(adp, adn, adl, list) {
9160                 list_del(&adp->list);
9161                 kfree(adp);
9162         }
9163 }
9164
9165 static void nf_tables_commit_audit_collect(struct list_head *adl,
9166                                            struct nft_table *table, u32 op)
9167 {
9168         struct nft_audit_data *adp;
9169
9170         list_for_each_entry(adp, adl, list) {
9171                 if (adp->table == table)
9172                         goto found;
9173         }
9174         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9175         return;
9176 found:
9177         adp->entries++;
9178         if (!adp->op || adp->op > op)
9179                 adp->op = op;
9180 }
9181
9182 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9183
9184 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9185 {
9186         struct nft_audit_data *adp, *adn;
9187         char aubuf[AUNFTABLENAMELEN];
9188
9189         list_for_each_entry_safe(adp, adn, adl, list) {
9190                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9191                          generation);
9192                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9193                                 nft2audit_op[adp->op], GFP_KERNEL);
9194                 list_del(&adp->list);
9195                 kfree(adp);
9196         }
9197 }
9198
9199 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9200 {
9201         struct nftables_pernet *nft_net = nft_pernet(net);
9202         struct nft_trans *trans, *next;
9203         struct nft_trans_elem *te;
9204         struct nft_chain *chain;
9205         struct nft_table *table;
9206         unsigned int base_seq;
9207         LIST_HEAD(adl);
9208         int err;
9209
9210         if (list_empty(&nft_net->commit_list)) {
9211                 mutex_unlock(&nft_net->commit_mutex);
9212                 return 0;
9213         }
9214
9215         /* 0. Validate ruleset, otherwise roll back for error reporting. */
9216         if (nf_tables_validate(net) < 0)
9217                 return -EAGAIN;
9218
9219         err = nft_flow_rule_offload_commit(net);
9220         if (err < 0)
9221                 return err;
9222
9223         /* 1.  Allocate space for next generation rules_gen_X[] */
9224         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9225                 int ret;
9226
9227                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9228                 if (ret) {
9229                         nf_tables_commit_chain_prepare_cancel(net);
9230                         nf_tables_commit_audit_free(&adl);
9231                         return ret;
9232                 }
9233                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9234                     trans->msg_type == NFT_MSG_DELRULE) {
9235                         chain = trans->ctx.chain;
9236
9237                         ret = nf_tables_commit_chain_prepare(net, chain);
9238                         if (ret < 0) {
9239                                 nf_tables_commit_chain_prepare_cancel(net);
9240                                 nf_tables_commit_audit_free(&adl);
9241                                 return ret;
9242                         }
9243                 }
9244         }
9245
9246         /* step 2.  Make rules_gen_X visible to packet path */
9247         list_for_each_entry(table, &nft_net->tables, list) {
9248                 list_for_each_entry(chain, &table->chains, list)
9249                         nf_tables_commit_chain(net, chain);
9250         }
9251
9252         /*
9253          * Bump generation counter, invalidate any dump in progress.
9254          * Cannot fail after this point.
9255          */
9256         base_seq = READ_ONCE(nft_net->base_seq);
9257         while (++base_seq == 0)
9258                 ;
9259
9260         WRITE_ONCE(nft_net->base_seq, base_seq);
9261
9262         /* step 3. Start new generation, rules_gen_X now in use. */
9263         net->nft.gencursor = nft_gencursor_next(net);
9264
9265         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9266                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9267                                                trans->msg_type);
9268                 switch (trans->msg_type) {
9269                 case NFT_MSG_NEWTABLE:
9270                         if (nft_trans_table_update(trans)) {
9271                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9272                                         nft_trans_destroy(trans);
9273                                         break;
9274                                 }
9275                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9276                                         nf_tables_table_disable(net, trans->ctx.table);
9277
9278                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9279                         } else {
9280                                 nft_clear(net, trans->ctx.table);
9281                         }
9282                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
9283                         nft_trans_destroy(trans);
9284                         break;
9285                 case NFT_MSG_DELTABLE:
9286                 case NFT_MSG_DESTROYTABLE:
9287                         list_del_rcu(&trans->ctx.table->list);
9288                         nf_tables_table_notify(&trans->ctx, trans->msg_type);
9289                         break;
9290                 case NFT_MSG_NEWCHAIN:
9291                         if (nft_trans_chain_update(trans)) {
9292                                 nft_chain_commit_update(trans);
9293                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
9294                                                        &nft_trans_chain_hooks(trans));
9295                                 list_splice(&nft_trans_chain_hooks(trans),
9296                                             &nft_trans_basechain(trans)->hook_list);
9297                                 /* trans destroyed after rcu grace period */
9298                         } else {
9299                                 nft_chain_commit_drop_policy(trans);
9300                                 nft_clear(net, trans->ctx.chain);
9301                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
9302                                 nft_trans_destroy(trans);
9303                         }
9304                         break;
9305                 case NFT_MSG_DELCHAIN:
9306                 case NFT_MSG_DESTROYCHAIN:
9307                         nft_chain_del(trans->ctx.chain);
9308                         nf_tables_chain_notify(&trans->ctx, trans->msg_type, NULL);
9309                         nf_tables_unregister_hook(trans->ctx.net,
9310                                                   trans->ctx.table,
9311                                                   trans->ctx.chain);
9312                         break;
9313                 case NFT_MSG_NEWRULE:
9314                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9315                         nf_tables_rule_notify(&trans->ctx,
9316                                               nft_trans_rule(trans),
9317                                               NFT_MSG_NEWRULE);
9318                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9319                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9320
9321                         nft_trans_destroy(trans);
9322                         break;
9323                 case NFT_MSG_DELRULE:
9324                 case NFT_MSG_DESTROYRULE:
9325                         list_del_rcu(&nft_trans_rule(trans)->list);
9326                         nf_tables_rule_notify(&trans->ctx,
9327                                               nft_trans_rule(trans),
9328                                               trans->msg_type);
9329                         nft_rule_expr_deactivate(&trans->ctx,
9330                                                  nft_trans_rule(trans),
9331                                                  NFT_TRANS_COMMIT);
9332
9333                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9334                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9335                         break;
9336                 case NFT_MSG_NEWSET:
9337                         if (nft_trans_set_update(trans)) {
9338                                 struct nft_set *set = nft_trans_set(trans);
9339
9340                                 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
9341                                 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
9342                         } else {
9343                                 nft_clear(net, nft_trans_set(trans));
9344                                 /* This avoids hitting -EBUSY when deleting the table
9345                                  * from the transaction.
9346                                  */
9347                                 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
9348                                     !list_empty(&nft_trans_set(trans)->bindings))
9349                                         trans->ctx.table->use--;
9350                         }
9351                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9352                                              NFT_MSG_NEWSET, GFP_KERNEL);
9353                         nft_trans_destroy(trans);
9354                         break;
9355                 case NFT_MSG_DELSET:
9356                 case NFT_MSG_DESTROYSET:
9357                         list_del_rcu(&nft_trans_set(trans)->list);
9358                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9359                                              trans->msg_type, GFP_KERNEL);
9360                         break;
9361                 case NFT_MSG_NEWSETELEM:
9362                         te = (struct nft_trans_elem *)trans->data;
9363
9364                         nft_setelem_activate(net, te->set, &te->elem);
9365                         nf_tables_setelem_notify(&trans->ctx, te->set,
9366                                                  &te->elem,
9367                                                  NFT_MSG_NEWSETELEM);
9368                         nft_trans_destroy(trans);
9369                         break;
9370                 case NFT_MSG_DELSETELEM:
9371                 case NFT_MSG_DESTROYSETELEM:
9372                         te = (struct nft_trans_elem *)trans->data;
9373
9374                         nf_tables_setelem_notify(&trans->ctx, te->set,
9375                                                  &te->elem,
9376                                                  trans->msg_type);
9377                         nft_setelem_remove(net, te->set, &te->elem);
9378                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
9379                                 atomic_dec(&te->set->nelems);
9380                                 te->set->ndeact--;
9381                         }
9382                         break;
9383                 case NFT_MSG_NEWOBJ:
9384                         if (nft_trans_obj_update(trans)) {
9385                                 nft_obj_commit_update(trans);
9386                                 nf_tables_obj_notify(&trans->ctx,
9387                                                      nft_trans_obj(trans),
9388                                                      NFT_MSG_NEWOBJ);
9389                         } else {
9390                                 nft_clear(net, nft_trans_obj(trans));
9391                                 nf_tables_obj_notify(&trans->ctx,
9392                                                      nft_trans_obj(trans),
9393                                                      NFT_MSG_NEWOBJ);
9394                                 nft_trans_destroy(trans);
9395                         }
9396                         break;
9397                 case NFT_MSG_DELOBJ:
9398                 case NFT_MSG_DESTROYOBJ:
9399                         nft_obj_del(nft_trans_obj(trans));
9400                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
9401                                              trans->msg_type);
9402                         break;
9403                 case NFT_MSG_NEWFLOWTABLE:
9404                         if (nft_trans_flowtable_update(trans)) {
9405                                 nft_trans_flowtable(trans)->data.flags =
9406                                         nft_trans_flowtable_flags(trans);
9407                                 nf_tables_flowtable_notify(&trans->ctx,
9408                                                            nft_trans_flowtable(trans),
9409                                                            &nft_trans_flowtable_hooks(trans),
9410                                                            NFT_MSG_NEWFLOWTABLE);
9411                                 list_splice(&nft_trans_flowtable_hooks(trans),
9412                                             &nft_trans_flowtable(trans)->hook_list);
9413                         } else {
9414                                 nft_clear(net, nft_trans_flowtable(trans));
9415                                 nf_tables_flowtable_notify(&trans->ctx,
9416                                                            nft_trans_flowtable(trans),
9417                                                            NULL,
9418                                                            NFT_MSG_NEWFLOWTABLE);
9419                         }
9420                         nft_trans_destroy(trans);
9421                         break;
9422                 case NFT_MSG_DELFLOWTABLE:
9423                 case NFT_MSG_DESTROYFLOWTABLE:
9424                         if (nft_trans_flowtable_update(trans)) {
9425                                 nf_tables_flowtable_notify(&trans->ctx,
9426                                                            nft_trans_flowtable(trans),
9427                                                            &nft_trans_flowtable_hooks(trans),
9428                                                            trans->msg_type);
9429                                 nft_unregister_flowtable_net_hooks(net,
9430                                                                    &nft_trans_flowtable_hooks(trans));
9431                         } else {
9432                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9433                                 nf_tables_flowtable_notify(&trans->ctx,
9434                                                            nft_trans_flowtable(trans),
9435                                                            NULL,
9436                                                            trans->msg_type);
9437                                 nft_unregister_flowtable_net_hooks(net,
9438                                                 &nft_trans_flowtable(trans)->hook_list);
9439                         }
9440                         break;
9441                 }
9442         }
9443
9444         nft_commit_notify(net, NETLINK_CB(skb).portid);
9445         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
9446         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
9447         nf_tables_commit_release(net);
9448
9449         return 0;
9450 }
9451
9452 static void nf_tables_module_autoload(struct net *net)
9453 {
9454         struct nftables_pernet *nft_net = nft_pernet(net);
9455         struct nft_module_request *req, *next;
9456         LIST_HEAD(module_list);
9457
9458         list_splice_init(&nft_net->module_list, &module_list);
9459         mutex_unlock(&nft_net->commit_mutex);
9460         list_for_each_entry_safe(req, next, &module_list, list) {
9461                 request_module("%s", req->module);
9462                 req->done = true;
9463         }
9464         mutex_lock(&nft_net->commit_mutex);
9465         list_splice(&module_list, &nft_net->module_list);
9466 }
9467
9468 static void nf_tables_abort_release(struct nft_trans *trans)
9469 {
9470         switch (trans->msg_type) {
9471         case NFT_MSG_NEWTABLE:
9472                 nf_tables_table_destroy(&trans->ctx);
9473                 break;
9474         case NFT_MSG_NEWCHAIN:
9475                 if (nft_trans_chain_update(trans))
9476                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9477                 else
9478                         nf_tables_chain_destroy(&trans->ctx);
9479                 break;
9480         case NFT_MSG_NEWRULE:
9481                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9482                 break;
9483         case NFT_MSG_NEWSET:
9484                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9485                 break;
9486         case NFT_MSG_NEWSETELEM:
9487                 nft_set_elem_destroy(nft_trans_elem_set(trans),
9488                                      nft_trans_elem(trans).priv, true);
9489                 break;
9490         case NFT_MSG_NEWOBJ:
9491                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9492                 break;
9493         case NFT_MSG_NEWFLOWTABLE:
9494                 if (nft_trans_flowtable_update(trans))
9495                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9496                 else
9497                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9498                 break;
9499         }
9500         kfree(trans);
9501 }
9502
9503 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9504 {
9505         struct nftables_pernet *nft_net = nft_pernet(net);
9506         struct nft_trans *trans, *next;
9507         struct nft_trans_elem *te;
9508
9509         if (action == NFNL_ABORT_VALIDATE &&
9510             nf_tables_validate(net) < 0)
9511                 return -EAGAIN;
9512
9513         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9514                                          list) {
9515                 switch (trans->msg_type) {
9516                 case NFT_MSG_NEWTABLE:
9517                         if (nft_trans_table_update(trans)) {
9518                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9519                                         nft_trans_destroy(trans);
9520                                         break;
9521                                 }
9522                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9523                                         nf_tables_table_disable(net, trans->ctx.table);
9524                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9525                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9526                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9527                                 }
9528                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9529                                 nft_trans_destroy(trans);
9530                         } else {
9531                                 list_del_rcu(&trans->ctx.table->list);
9532                         }
9533                         break;
9534                 case NFT_MSG_DELTABLE:
9535                 case NFT_MSG_DESTROYTABLE:
9536                         nft_clear(trans->ctx.net, trans->ctx.table);
9537                         nft_trans_destroy(trans);
9538                         break;
9539                 case NFT_MSG_NEWCHAIN:
9540                         if (nft_trans_chain_update(trans)) {
9541                                 nft_netdev_unregister_hooks(net,
9542                                                             &nft_trans_chain_hooks(trans),
9543                                                             true);
9544                                 free_percpu(nft_trans_chain_stats(trans));
9545                                 kfree(nft_trans_chain_name(trans));
9546                                 nft_trans_destroy(trans);
9547                         } else {
9548                                 if (nft_chain_is_bound(trans->ctx.chain)) {
9549                                         nft_trans_destroy(trans);
9550                                         break;
9551                                 }
9552                                 trans->ctx.table->use--;
9553                                 nft_chain_del(trans->ctx.chain);
9554                                 nf_tables_unregister_hook(trans->ctx.net,
9555                                                           trans->ctx.table,
9556                                                           trans->ctx.chain);
9557                         }
9558                         break;
9559                 case NFT_MSG_DELCHAIN:
9560                 case NFT_MSG_DESTROYCHAIN:
9561                         trans->ctx.table->use++;
9562                         nft_clear(trans->ctx.net, trans->ctx.chain);
9563                         nft_trans_destroy(trans);
9564                         break;
9565                 case NFT_MSG_NEWRULE:
9566                         trans->ctx.chain->use--;
9567                         list_del_rcu(&nft_trans_rule(trans)->list);
9568                         nft_rule_expr_deactivate(&trans->ctx,
9569                                                  nft_trans_rule(trans),
9570                                                  NFT_TRANS_ABORT);
9571                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9572                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9573                         break;
9574                 case NFT_MSG_DELRULE:
9575                 case NFT_MSG_DESTROYRULE:
9576                         trans->ctx.chain->use++;
9577                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9578                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9579                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9580                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9581
9582                         nft_trans_destroy(trans);
9583                         break;
9584                 case NFT_MSG_NEWSET:
9585                         if (nft_trans_set_update(trans)) {
9586                                 nft_trans_destroy(trans);
9587                                 break;
9588                         }
9589                         trans->ctx.table->use--;
9590                         if (nft_trans_set_bound(trans)) {
9591                                 nft_trans_destroy(trans);
9592                                 break;
9593                         }
9594                         list_del_rcu(&nft_trans_set(trans)->list);
9595                         break;
9596                 case NFT_MSG_DELSET:
9597                 case NFT_MSG_DESTROYSET:
9598                         trans->ctx.table->use++;
9599                         nft_clear(trans->ctx.net, nft_trans_set(trans));
9600                         nft_trans_destroy(trans);
9601                         break;
9602                 case NFT_MSG_NEWSETELEM:
9603                         if (nft_trans_elem_set_bound(trans)) {
9604                                 nft_trans_destroy(trans);
9605                                 break;
9606                         }
9607                         te = (struct nft_trans_elem *)trans->data;
9608                         nft_setelem_remove(net, te->set, &te->elem);
9609                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9610                                 atomic_dec(&te->set->nelems);
9611                         break;
9612                 case NFT_MSG_DELSETELEM:
9613                 case NFT_MSG_DESTROYSETELEM:
9614                         te = (struct nft_trans_elem *)trans->data;
9615
9616                         nft_setelem_data_activate(net, te->set, &te->elem);
9617                         nft_setelem_activate(net, te->set, &te->elem);
9618                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9619                                 te->set->ndeact--;
9620
9621                         nft_trans_destroy(trans);
9622                         break;
9623                 case NFT_MSG_NEWOBJ:
9624                         if (nft_trans_obj_update(trans)) {
9625                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9626                                 nft_trans_destroy(trans);
9627                         } else {
9628                                 trans->ctx.table->use--;
9629                                 nft_obj_del(nft_trans_obj(trans));
9630                         }
9631                         break;
9632                 case NFT_MSG_DELOBJ:
9633                 case NFT_MSG_DESTROYOBJ:
9634                         trans->ctx.table->use++;
9635                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
9636                         nft_trans_destroy(trans);
9637                         break;
9638                 case NFT_MSG_NEWFLOWTABLE:
9639                         if (nft_trans_flowtable_update(trans)) {
9640                                 nft_unregister_flowtable_net_hooks(net,
9641                                                 &nft_trans_flowtable_hooks(trans));
9642                         } else {
9643                                 trans->ctx.table->use--;
9644                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9645                                 nft_unregister_flowtable_net_hooks(net,
9646                                                 &nft_trans_flowtable(trans)->hook_list);
9647                         }
9648                         break;
9649                 case NFT_MSG_DELFLOWTABLE:
9650                 case NFT_MSG_DESTROYFLOWTABLE:
9651                         if (nft_trans_flowtable_update(trans)) {
9652                                 list_splice(&nft_trans_flowtable_hooks(trans),
9653                                             &nft_trans_flowtable(trans)->hook_list);
9654                         } else {
9655                                 trans->ctx.table->use++;
9656                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9657                         }
9658                         nft_trans_destroy(trans);
9659                         break;
9660                 }
9661         }
9662
9663         synchronize_rcu();
9664
9665         list_for_each_entry_safe_reverse(trans, next,
9666                                          &nft_net->commit_list, list) {
9667                 list_del(&trans->list);
9668                 nf_tables_abort_release(trans);
9669         }
9670
9671         if (action == NFNL_ABORT_AUTOLOAD)
9672                 nf_tables_module_autoload(net);
9673         else
9674                 nf_tables_module_autoload_cleanup(net);
9675
9676         return 0;
9677 }
9678
9679 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9680                            enum nfnl_abort_action action)
9681 {
9682         struct nftables_pernet *nft_net = nft_pernet(net);
9683         int ret = __nf_tables_abort(net, action);
9684
9685         mutex_unlock(&nft_net->commit_mutex);
9686
9687         return ret;
9688 }
9689
9690 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9691 {
9692         struct nftables_pernet *nft_net = nft_pernet(net);
9693         bool genid_ok;
9694
9695         mutex_lock(&nft_net->commit_mutex);
9696
9697         genid_ok = genid == 0 || nft_net->base_seq == genid;
9698         if (!genid_ok)
9699                 mutex_unlock(&nft_net->commit_mutex);
9700
9701         /* else, commit mutex has to be released by commit or abort function */
9702         return genid_ok;
9703 }
9704
9705 static const struct nfnetlink_subsystem nf_tables_subsys = {
9706         .name           = "nf_tables",
9707         .subsys_id      = NFNL_SUBSYS_NFTABLES,
9708         .cb_count       = NFT_MSG_MAX,
9709         .cb             = nf_tables_cb,
9710         .commit         = nf_tables_commit,
9711         .abort          = nf_tables_abort,
9712         .valid_genid    = nf_tables_valid_genid,
9713         .owner          = THIS_MODULE,
9714 };
9715
9716 int nft_chain_validate_dependency(const struct nft_chain *chain,
9717                                   enum nft_chain_types type)
9718 {
9719         const struct nft_base_chain *basechain;
9720
9721         if (nft_is_base_chain(chain)) {
9722                 basechain = nft_base_chain(chain);
9723                 if (basechain->type->type != type)
9724                         return -EOPNOTSUPP;
9725         }
9726         return 0;
9727 }
9728 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9729
9730 int nft_chain_validate_hooks(const struct nft_chain *chain,
9731                              unsigned int hook_flags)
9732 {
9733         struct nft_base_chain *basechain;
9734
9735         if (nft_is_base_chain(chain)) {
9736                 basechain = nft_base_chain(chain);
9737
9738                 if ((1 << basechain->ops.hooknum) & hook_flags)
9739                         return 0;
9740
9741                 return -EOPNOTSUPP;
9742         }
9743
9744         return 0;
9745 }
9746 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9747
9748 /*
9749  * Loop detection - walk through the ruleset beginning at the destination chain
9750  * of a new jump until either the source chain is reached (loop) or all
9751  * reachable chains have been traversed.
9752  *
9753  * The loop check is performed whenever a new jump verdict is added to an
9754  * expression or verdict map or a verdict map is bound to a new chain.
9755  */
9756
9757 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9758                                  const struct nft_chain *chain);
9759
9760 static int nft_check_loops(const struct nft_ctx *ctx,
9761                            const struct nft_set_ext *ext)
9762 {
9763         const struct nft_data *data;
9764         int ret;
9765
9766         data = nft_set_ext_data(ext);
9767         switch (data->verdict.code) {
9768         case NFT_JUMP:
9769         case NFT_GOTO:
9770                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9771                 break;
9772         default:
9773                 ret = 0;
9774                 break;
9775         }
9776
9777         return ret;
9778 }
9779
9780 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9781                                         struct nft_set *set,
9782                                         const struct nft_set_iter *iter,
9783                                         struct nft_set_elem *elem)
9784 {
9785         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9786
9787         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9788             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9789                 return 0;
9790
9791         return nft_check_loops(ctx, ext);
9792 }
9793
9794 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9795                                   struct nft_set *set)
9796 {
9797         u8 genmask = nft_genmask_next(ctx->net);
9798         struct nft_set_elem_catchall *catchall;
9799         struct nft_set_ext *ext;
9800         int ret = 0;
9801
9802         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9803                 ext = nft_set_elem_ext(set, catchall->elem);
9804                 if (!nft_set_elem_active(ext, genmask))
9805                         continue;
9806
9807                 ret = nft_check_loops(ctx, ext);
9808                 if (ret < 0)
9809                         return ret;
9810         }
9811
9812         return ret;
9813 }
9814
9815 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9816                                  const struct nft_chain *chain)
9817 {
9818         const struct nft_rule *rule;
9819         const struct nft_expr *expr, *last;
9820         struct nft_set *set;
9821         struct nft_set_binding *binding;
9822         struct nft_set_iter iter;
9823
9824         if (ctx->chain == chain)
9825                 return -ELOOP;
9826
9827         list_for_each_entry(rule, &chain->rules, list) {
9828                 nft_rule_for_each_expr(expr, last, rule) {
9829                         struct nft_immediate_expr *priv;
9830                         const struct nft_data *data;
9831                         int err;
9832
9833                         if (strcmp(expr->ops->type->name, "immediate"))
9834                                 continue;
9835
9836                         priv = nft_expr_priv(expr);
9837                         if (priv->dreg != NFT_REG_VERDICT)
9838                                 continue;
9839
9840                         data = &priv->data;
9841                         switch (data->verdict.code) {
9842                         case NFT_JUMP:
9843                         case NFT_GOTO:
9844                                 err = nf_tables_check_loops(ctx,
9845                                                         data->verdict.chain);
9846                                 if (err < 0)
9847                                         return err;
9848                                 break;
9849                         default:
9850                                 break;
9851                         }
9852                 }
9853         }
9854
9855         list_for_each_entry(set, &ctx->table->sets, list) {
9856                 if (!nft_is_active_next(ctx->net, set))
9857                         continue;
9858                 if (!(set->flags & NFT_SET_MAP) ||
9859                     set->dtype != NFT_DATA_VERDICT)
9860                         continue;
9861
9862                 list_for_each_entry(binding, &set->bindings, list) {
9863                         if (!(binding->flags & NFT_SET_MAP) ||
9864                             binding->chain != chain)
9865                                 continue;
9866
9867                         iter.genmask    = nft_genmask_next(ctx->net);
9868                         iter.skip       = 0;
9869                         iter.count      = 0;
9870                         iter.err        = 0;
9871                         iter.fn         = nf_tables_loop_check_setelem;
9872
9873                         set->ops->walk(ctx, set, &iter);
9874                         if (!iter.err)
9875                                 iter.err = nft_set_catchall_loops(ctx, set);
9876
9877                         if (iter.err < 0)
9878                                 return iter.err;
9879                 }
9880         }
9881
9882         return 0;
9883 }
9884
9885 /**
9886  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
9887  *
9888  *      @attr: netlink attribute to fetch value from
9889  *      @max: maximum value to be stored in dest
9890  *      @dest: pointer to the variable
9891  *
9892  *      Parse, check and store a given u32 netlink attribute into variable.
9893  *      This function returns -ERANGE if the value goes over maximum value.
9894  *      Otherwise a 0 is returned and the attribute value is stored in the
9895  *      destination variable.
9896  */
9897 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9898 {
9899         u32 val;
9900
9901         val = ntohl(nla_get_be32(attr));
9902         if (val > max)
9903                 return -ERANGE;
9904
9905         *dest = val;
9906         return 0;
9907 }
9908 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9909
9910 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
9911 {
9912         unsigned int reg;
9913
9914         reg = ntohl(nla_get_be32(attr));
9915         switch (reg) {
9916         case NFT_REG_VERDICT...NFT_REG_4:
9917                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9918                 break;
9919         case NFT_REG32_00...NFT_REG32_15:
9920                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9921                 break;
9922         default:
9923                 return -ERANGE;
9924         }
9925
9926         return 0;
9927 }
9928
9929 /**
9930  *      nft_dump_register - dump a register value to a netlink attribute
9931  *
9932  *      @skb: socket buffer
9933  *      @attr: attribute number
9934  *      @reg: register number
9935  *
9936  *      Construct a netlink attribute containing the register number. For
9937  *      compatibility reasons, register numbers being a multiple of 4 are
9938  *      translated to the corresponding 128 bit register numbers.
9939  */
9940 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9941 {
9942         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9943                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9944         else
9945                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9946
9947         return nla_put_be32(skb, attr, htonl(reg));
9948 }
9949 EXPORT_SYMBOL_GPL(nft_dump_register);
9950
9951 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9952 {
9953         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9954                 return -EINVAL;
9955         if (len == 0)
9956                 return -EINVAL;
9957         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9958                 return -ERANGE;
9959
9960         return 0;
9961 }
9962
9963 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9964 {
9965         u32 reg;
9966         int err;
9967
9968         err = nft_parse_register(attr, &reg);
9969         if (err < 0)
9970                 return err;
9971
9972         err = nft_validate_register_load(reg, len);
9973         if (err < 0)
9974                 return err;
9975
9976         *sreg = reg;
9977         return 0;
9978 }
9979 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9980
9981 static int nft_validate_register_store(const struct nft_ctx *ctx,
9982                                        enum nft_registers reg,
9983                                        const struct nft_data *data,
9984                                        enum nft_data_types type,
9985                                        unsigned int len)
9986 {
9987         int err;
9988
9989         switch (reg) {
9990         case NFT_REG_VERDICT:
9991                 if (type != NFT_DATA_VERDICT)
9992                         return -EINVAL;
9993
9994                 if (data != NULL &&
9995                     (data->verdict.code == NFT_GOTO ||
9996                      data->verdict.code == NFT_JUMP)) {
9997                         err = nf_tables_check_loops(ctx, data->verdict.chain);
9998                         if (err < 0)
9999                                 return err;
10000                 }
10001
10002                 return 0;
10003         default:
10004                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10005                         return -EINVAL;
10006                 if (len == 0)
10007                         return -EINVAL;
10008                 if (reg * NFT_REG32_SIZE + len >
10009                     sizeof_field(struct nft_regs, data))
10010                         return -ERANGE;
10011
10012                 if (data != NULL && type != NFT_DATA_VALUE)
10013                         return -EINVAL;
10014                 return 0;
10015         }
10016 }
10017
10018 int nft_parse_register_store(const struct nft_ctx *ctx,
10019                              const struct nlattr *attr, u8 *dreg,
10020                              const struct nft_data *data,
10021                              enum nft_data_types type, unsigned int len)
10022 {
10023         int err;
10024         u32 reg;
10025
10026         err = nft_parse_register(attr, &reg);
10027         if (err < 0)
10028                 return err;
10029
10030         err = nft_validate_register_store(ctx, reg, data, type, len);
10031         if (err < 0)
10032                 return err;
10033
10034         *dreg = reg;
10035         return 0;
10036 }
10037 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10038
10039 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10040         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
10041         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
10042                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
10043         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10044 };
10045
10046 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10047                             struct nft_data_desc *desc, const struct nlattr *nla)
10048 {
10049         u8 genmask = nft_genmask_next(ctx->net);
10050         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10051         struct nft_chain *chain;
10052         int err;
10053
10054         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10055                                           nft_verdict_policy, NULL);
10056         if (err < 0)
10057                 return err;
10058
10059         if (!tb[NFTA_VERDICT_CODE])
10060                 return -EINVAL;
10061         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10062
10063         switch (data->verdict.code) {
10064         default:
10065                 switch (data->verdict.code & NF_VERDICT_MASK) {
10066                 case NF_ACCEPT:
10067                 case NF_DROP:
10068                 case NF_QUEUE:
10069                         break;
10070                 default:
10071                         return -EINVAL;
10072                 }
10073                 fallthrough;
10074         case NFT_CONTINUE:
10075         case NFT_BREAK:
10076         case NFT_RETURN:
10077                 break;
10078         case NFT_JUMP:
10079         case NFT_GOTO:
10080                 if (tb[NFTA_VERDICT_CHAIN]) {
10081                         chain = nft_chain_lookup(ctx->net, ctx->table,
10082                                                  tb[NFTA_VERDICT_CHAIN],
10083                                                  genmask);
10084                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10085                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10086                                                       tb[NFTA_VERDICT_CHAIN_ID]);
10087                         if (IS_ERR(chain))
10088                                 return PTR_ERR(chain);
10089                 } else {
10090                         return -EINVAL;
10091                 }
10092
10093                 if (IS_ERR(chain))
10094                         return PTR_ERR(chain);
10095                 if (nft_is_base_chain(chain))
10096                         return -EOPNOTSUPP;
10097                 if (nft_chain_is_bound(chain))
10098                         return -EINVAL;
10099                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10100                     chain->flags & NFT_CHAIN_BINDING)
10101                         return -EINVAL;
10102
10103                 chain->use++;
10104                 data->verdict.chain = chain;
10105                 break;
10106         }
10107
10108         desc->len = sizeof(data->verdict);
10109
10110         return 0;
10111 }
10112
10113 static void nft_verdict_uninit(const struct nft_data *data)
10114 {
10115         struct nft_chain *chain;
10116         struct nft_rule *rule;
10117
10118         switch (data->verdict.code) {
10119         case NFT_JUMP:
10120         case NFT_GOTO:
10121                 chain = data->verdict.chain;
10122                 chain->use--;
10123
10124                 if (!nft_chain_is_bound(chain))
10125                         break;
10126
10127                 chain->table->use--;
10128                 list_for_each_entry(rule, &chain->rules, list)
10129                         chain->use--;
10130
10131                 nft_chain_del(chain);
10132                 break;
10133         }
10134 }
10135
10136 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10137 {
10138         struct nlattr *nest;
10139
10140         nest = nla_nest_start_noflag(skb, type);
10141         if (!nest)
10142                 goto nla_put_failure;
10143
10144         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10145                 goto nla_put_failure;
10146
10147         switch (v->code) {
10148         case NFT_JUMP:
10149         case NFT_GOTO:
10150                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10151                                    v->chain->name))
10152                         goto nla_put_failure;
10153         }
10154         nla_nest_end(skb, nest);
10155         return 0;
10156
10157 nla_put_failure:
10158         return -1;
10159 }
10160
10161 static int nft_value_init(const struct nft_ctx *ctx,
10162                           struct nft_data *data, struct nft_data_desc *desc,
10163                           const struct nlattr *nla)
10164 {
10165         unsigned int len;
10166
10167         len = nla_len(nla);
10168         if (len == 0)
10169                 return -EINVAL;
10170         if (len > desc->size)
10171                 return -EOVERFLOW;
10172         if (desc->len) {
10173                 if (len != desc->len)
10174                         return -EINVAL;
10175         } else {
10176                 desc->len = len;
10177         }
10178
10179         nla_memcpy(data->data, nla, len);
10180
10181         return 0;
10182 }
10183
10184 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10185                           unsigned int len)
10186 {
10187         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10188 }
10189
10190 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10191         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
10192         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
10193 };
10194
10195 /**
10196  *      nft_data_init - parse nf_tables data netlink attributes
10197  *
10198  *      @ctx: context of the expression using the data
10199  *      @data: destination struct nft_data
10200  *      @desc: data description
10201  *      @nla: netlink attribute containing data
10202  *
10203  *      Parse the netlink data attributes and initialize a struct nft_data.
10204  *      The type and length of data are returned in the data description.
10205  *
10206  *      The caller can indicate that it only wants to accept data of type
10207  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
10208  */
10209 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
10210                   struct nft_data_desc *desc, const struct nlattr *nla)
10211 {
10212         struct nlattr *tb[NFTA_DATA_MAX + 1];
10213         int err;
10214
10215         if (WARN_ON_ONCE(!desc->size))
10216                 return -EINVAL;
10217
10218         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
10219                                           nft_data_policy, NULL);
10220         if (err < 0)
10221                 return err;
10222
10223         if (tb[NFTA_DATA_VALUE]) {
10224                 if (desc->type != NFT_DATA_VALUE)
10225                         return -EINVAL;
10226
10227                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
10228         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
10229                 if (desc->type != NFT_DATA_VERDICT)
10230                         return -EINVAL;
10231
10232                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
10233         } else {
10234                 err = -EINVAL;
10235         }
10236
10237         return err;
10238 }
10239 EXPORT_SYMBOL_GPL(nft_data_init);
10240
10241 /**
10242  *      nft_data_release - release a nft_data item
10243  *
10244  *      @data: struct nft_data to release
10245  *      @type: type of data
10246  *
10247  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
10248  *      all others need to be released by calling this function.
10249  */
10250 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
10251 {
10252         if (type < NFT_DATA_VERDICT)
10253                 return;
10254         switch (type) {
10255         case NFT_DATA_VERDICT:
10256                 return nft_verdict_uninit(data);
10257         default:
10258                 WARN_ON(1);
10259         }
10260 }
10261 EXPORT_SYMBOL_GPL(nft_data_release);
10262
10263 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
10264                   enum nft_data_types type, unsigned int len)
10265 {
10266         struct nlattr *nest;
10267         int err;
10268
10269         nest = nla_nest_start_noflag(skb, attr);
10270         if (nest == NULL)
10271                 return -1;
10272
10273         switch (type) {
10274         case NFT_DATA_VALUE:
10275                 err = nft_value_dump(skb, data, len);
10276                 break;
10277         case NFT_DATA_VERDICT:
10278                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
10279                 break;
10280         default:
10281                 err = -EINVAL;
10282                 WARN_ON(1);
10283         }
10284
10285         nla_nest_end(skb, nest);
10286         return err;
10287 }
10288 EXPORT_SYMBOL_GPL(nft_data_dump);
10289
10290 int __nft_release_basechain(struct nft_ctx *ctx)
10291 {
10292         struct nft_rule *rule, *nr;
10293
10294         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
10295                 return 0;
10296
10297         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
10298         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
10299                 list_del(&rule->list);
10300                 ctx->chain->use--;
10301                 nf_tables_rule_release(ctx, rule);
10302         }
10303         nft_chain_del(ctx->chain);
10304         ctx->table->use--;
10305         nf_tables_chain_destroy(ctx);
10306
10307         return 0;
10308 }
10309 EXPORT_SYMBOL_GPL(__nft_release_basechain);
10310
10311 static void __nft_release_hook(struct net *net, struct nft_table *table)
10312 {
10313         struct nft_flowtable *flowtable;
10314         struct nft_chain *chain;
10315
10316         list_for_each_entry(chain, &table->chains, list)
10317                 __nf_tables_unregister_hook(net, table, chain, true);
10318         list_for_each_entry(flowtable, &table->flowtables, list)
10319                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
10320                                                      true);
10321 }
10322
10323 static void __nft_release_hooks(struct net *net)
10324 {
10325         struct nftables_pernet *nft_net = nft_pernet(net);
10326         struct nft_table *table;
10327
10328         list_for_each_entry(table, &nft_net->tables, list) {
10329                 if (nft_table_has_owner(table))
10330                         continue;
10331
10332                 __nft_release_hook(net, table);
10333         }
10334 }
10335
10336 static void __nft_release_table(struct net *net, struct nft_table *table)
10337 {
10338         struct nft_flowtable *flowtable, *nf;
10339         struct nft_chain *chain, *nc;
10340         struct nft_object *obj, *ne;
10341         struct nft_rule *rule, *nr;
10342         struct nft_set *set, *ns;
10343         struct nft_ctx ctx = {
10344                 .net    = net,
10345                 .family = NFPROTO_NETDEV,
10346         };
10347
10348         ctx.family = table->family;
10349         ctx.table = table;
10350         list_for_each_entry(chain, &table->chains, list) {
10351                 ctx.chain = chain;
10352                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
10353                         list_del(&rule->list);
10354                         chain->use--;
10355                         nf_tables_rule_release(&ctx, rule);
10356                 }
10357         }
10358         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
10359                 list_del(&flowtable->list);
10360                 table->use--;
10361                 nf_tables_flowtable_destroy(flowtable);
10362         }
10363         list_for_each_entry_safe(set, ns, &table->sets, list) {
10364                 list_del(&set->list);
10365                 table->use--;
10366                 nft_set_destroy(&ctx, set);
10367         }
10368         list_for_each_entry_safe(obj, ne, &table->objects, list) {
10369                 nft_obj_del(obj);
10370                 table->use--;
10371                 nft_obj_destroy(&ctx, obj);
10372         }
10373         list_for_each_entry_safe(chain, nc, &table->chains, list) {
10374                 ctx.chain = chain;
10375                 nft_chain_del(chain);
10376                 table->use--;
10377                 nf_tables_chain_destroy(&ctx);
10378         }
10379         nf_tables_table_destroy(&ctx);
10380 }
10381
10382 static void __nft_release_tables(struct net *net)
10383 {
10384         struct nftables_pernet *nft_net = nft_pernet(net);
10385         struct nft_table *table, *nt;
10386
10387         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
10388                 if (nft_table_has_owner(table))
10389                         continue;
10390
10391                 list_del(&table->list);
10392
10393                 __nft_release_table(net, table);
10394         }
10395 }
10396
10397 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
10398                             void *ptr)
10399 {
10400         struct nft_table *table, *to_delete[8];
10401         struct nftables_pernet *nft_net;
10402         struct netlink_notify *n = ptr;
10403         struct net *net = n->net;
10404         unsigned int deleted;
10405         bool restart = false;
10406
10407         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
10408                 return NOTIFY_DONE;
10409
10410         nft_net = nft_pernet(net);
10411         deleted = 0;
10412         mutex_lock(&nft_net->commit_mutex);
10413         if (!list_empty(&nf_tables_destroy_list))
10414                 rcu_barrier();
10415 again:
10416         list_for_each_entry(table, &nft_net->tables, list) {
10417                 if (nft_table_has_owner(table) &&
10418                     n->portid == table->nlpid) {
10419                         __nft_release_hook(net, table);
10420                         list_del_rcu(&table->list);
10421                         to_delete[deleted++] = table;
10422                         if (deleted >= ARRAY_SIZE(to_delete))
10423                                 break;
10424                 }
10425         }
10426         if (deleted) {
10427                 restart = deleted >= ARRAY_SIZE(to_delete);
10428                 synchronize_rcu();
10429                 while (deleted)
10430                         __nft_release_table(net, to_delete[--deleted]);
10431
10432                 if (restart)
10433                         goto again;
10434         }
10435         mutex_unlock(&nft_net->commit_mutex);
10436
10437         return NOTIFY_DONE;
10438 }
10439
10440 static struct notifier_block nft_nl_notifier = {
10441         .notifier_call  = nft_rcv_nl_event,
10442 };
10443
10444 static int __net_init nf_tables_init_net(struct net *net)
10445 {
10446         struct nftables_pernet *nft_net = nft_pernet(net);
10447
10448         INIT_LIST_HEAD(&nft_net->tables);
10449         INIT_LIST_HEAD(&nft_net->commit_list);
10450         INIT_LIST_HEAD(&nft_net->module_list);
10451         INIT_LIST_HEAD(&nft_net->notify_list);
10452         mutex_init(&nft_net->commit_mutex);
10453         nft_net->base_seq = 1;
10454
10455         return 0;
10456 }
10457
10458 static void __net_exit nf_tables_pre_exit_net(struct net *net)
10459 {
10460         struct nftables_pernet *nft_net = nft_pernet(net);
10461
10462         mutex_lock(&nft_net->commit_mutex);
10463         __nft_release_hooks(net);
10464         mutex_unlock(&nft_net->commit_mutex);
10465 }
10466
10467 static void __net_exit nf_tables_exit_net(struct net *net)
10468 {
10469         struct nftables_pernet *nft_net = nft_pernet(net);
10470
10471         mutex_lock(&nft_net->commit_mutex);
10472         if (!list_empty(&nft_net->commit_list) ||
10473             !list_empty(&nft_net->module_list))
10474                 __nf_tables_abort(net, NFNL_ABORT_NONE);
10475         __nft_release_tables(net);
10476         mutex_unlock(&nft_net->commit_mutex);
10477         WARN_ON_ONCE(!list_empty(&nft_net->tables));
10478         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
10479         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10480 }
10481
10482 static struct pernet_operations nf_tables_net_ops = {
10483         .init           = nf_tables_init_net,
10484         .pre_exit       = nf_tables_pre_exit_net,
10485         .exit           = nf_tables_exit_net,
10486         .id             = &nf_tables_net_id,
10487         .size           = sizeof(struct nftables_pernet),
10488 };
10489
10490 static int __init nf_tables_module_init(void)
10491 {
10492         int err;
10493
10494         err = register_pernet_subsys(&nf_tables_net_ops);
10495         if (err < 0)
10496                 return err;
10497
10498         err = nft_chain_filter_init();
10499         if (err < 0)
10500                 goto err_chain_filter;
10501
10502         err = nf_tables_core_module_init();
10503         if (err < 0)
10504                 goto err_core_module;
10505
10506         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10507         if (err < 0)
10508                 goto err_netdev_notifier;
10509
10510         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10511         if (err < 0)
10512                 goto err_rht_objname;
10513
10514         err = nft_offload_init();
10515         if (err < 0)
10516                 goto err_offload;
10517
10518         err = netlink_register_notifier(&nft_nl_notifier);
10519         if (err < 0)
10520                 goto err_netlink_notifier;
10521
10522         /* must be last */
10523         err = nfnetlink_subsys_register(&nf_tables_subsys);
10524         if (err < 0)
10525                 goto err_nfnl_subsys;
10526
10527         nft_chain_route_init();
10528
10529         return err;
10530
10531 err_nfnl_subsys:
10532         netlink_unregister_notifier(&nft_nl_notifier);
10533 err_netlink_notifier:
10534         nft_offload_exit();
10535 err_offload:
10536         rhltable_destroy(&nft_objname_ht);
10537 err_rht_objname:
10538         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10539 err_netdev_notifier:
10540         nf_tables_core_module_exit();
10541 err_core_module:
10542         nft_chain_filter_fini();
10543 err_chain_filter:
10544         unregister_pernet_subsys(&nf_tables_net_ops);
10545         return err;
10546 }
10547
10548 static void __exit nf_tables_module_exit(void)
10549 {
10550         nfnetlink_subsys_unregister(&nf_tables_subsys);
10551         netlink_unregister_notifier(&nft_nl_notifier);
10552         nft_offload_exit();
10553         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10554         nft_chain_filter_fini();
10555         nft_chain_route_fini();
10556         unregister_pernet_subsys(&nf_tables_net_ops);
10557         cancel_work_sync(&trans_destroy_work);
10558         rcu_barrier();
10559         rhltable_destroy(&nft_objname_ht);
10560         nf_tables_core_module_exit();
10561 }
10562
10563 module_init(nf_tables_module_init);
10564 module_exit(nf_tables_module_exit);
10565
10566 MODULE_LICENSE("GPL");
10567 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10568 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);