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netfilter: flowtable: Fix QinQ and pppoe support for inet table
[linux-block.git] / net / netfilter / nf_tables_api.c
CommitLineData
d2912cb1 1// SPDX-License-Identifier: GPL-2.0-only
96518518 2/*
20a69341 3 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
96518518 4 *
96518518
PM		 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>
1ff75a3e 13#include <linux/vmalloc.h>
0eb71a9d 14#include <linux/rhashtable.h>
8e6cf365 15#include <linux/audit.h>
96518518
PM		 16#include <linux/netfilter.h>
17#include <linux/netfilter/nfnetlink.h>
18#include <linux/netfilter/nf_tables.h>
3b49e2e9 19#include <net/netfilter/nf_flow_table.h>
96518518
PM		 20#include <net/netfilter/nf_tables_core.h>
21#include <net/netfilter/nf_tables.h>
c9626a2c 22#include <net/netfilter/nf_tables_offload.h>
99633ab2 23#include <net/net_namespace.h>
96518518
PM		 24#include <net/sock.h>
25
9332d27d
FW		 26#define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
27
0854db2a
FW		 28unsigned int nf_tables_net_id __read_mostly;
29
96518518 30static LIST_HEAD(nf_tables_expressions);
e5009240 31static LIST_HEAD(nf_tables_objects);
3b49e2e9 32static LIST_HEAD(nf_tables_flowtables);
0935d558
FW		 33static LIST_HEAD(nf_tables_destroy_list);
34static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
3ecbfd65 35static u64 table_handle;
96518518 36
a654de8f
PNA		 37enum {
38 NFT_VALIDATE_SKIP = 0,
39 NFT_VALIDATE_NEED,
40 NFT_VALIDATE_DO,
41};
42
4d44175a
FW		 43static struct rhltable nft_objname_ht;
44
1b2470e5
FW		 45static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
46static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
47static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
48
4d44175a
FW		 49static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
50static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
51static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
52
1b2470e5
FW		 53static const struct rhashtable_params nft_chain_ht_params = {
54 .head_offset = offsetof(struct nft_chain, rhlhead),
55 .key_offset = offsetof(struct nft_chain, name),
56 .hashfn = nft_chain_hash,
57 .obj_hashfn = nft_chain_hash_obj,
58 .obj_cmpfn = nft_chain_hash_cmp,
1b2470e5
FW		 59 .automatic_shrinking = true,
60};
61
4d44175a
FW		 62static const struct rhashtable_params nft_objname_ht_params = {
63 .head_offset = offsetof(struct nft_object, rhlhead),
64 .key_offset = offsetof(struct nft_object, key),
65 .hashfn = nft_objname_hash,
66 .obj_hashfn = nft_objname_hash_obj,
67 .obj_cmpfn = nft_objname_hash_cmp,
68 .automatic_shrinking = true,
69};
70
c520292f
RGB		 71struct nft_audit_data {
72 struct nft_table *table;
73 int entries;
74 int op;
75 struct list_head list;
76};
77
78static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
79 [NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER,
80 [NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID,
81 [NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER,
82 [NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER,
83 [NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID,
84 [NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER,
85 [NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER,
86 [NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID,
87 [NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER,
88 [NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER,
89 [NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID,
90 [NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER,
91 [NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER,
92 [NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID,
93 [NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER,
94 [NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER,
95 [NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID,
96 [NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID,
97 [NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER,
98 [NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID,
99 [NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER,
100 [NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET,
101 [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
102 [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
103 [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
104};
105
a654de8f
PNA		 106static void nft_validate_state_update(struct net *net, u8 new_validate_state)
107{
d59d2f82 108 struct nftables_pernet *nft_net = nft_pernet(net);
0854db2a
FW		 109
110 switch (nft_net->validate_state) {
a654de8f
PNA		 111 case NFT_VALIDATE_SKIP:
112 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
113 break;
114 case NFT_VALIDATE_NEED:
115 break;
116 case NFT_VALIDATE_DO:
117 if (new_validate_state == NFT_VALIDATE_NEED)
118 return;
119 }
120
0854db2a 121 nft_net->validate_state = new_validate_state;
a654de8f 122}
0935d558
FW		 123static void nf_tables_trans_destroy_work(struct work_struct *w);
124static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
a654de8f 125
7c95f6d8 126static void nft_ctx_init(struct nft_ctx *ctx,
633c9a84 127 struct net *net,
7c95f6d8
PNA		 128 const struct sk_buff *skb,
129 const struct nlmsghdr *nlh,
36596dad 130 u8 family,
7c95f6d8
PNA		 131 struct nft_table *table,
132 struct nft_chain *chain,
133 const struct nlattr * const *nla)
134{
633c9a84 135 ctx->net = net;
36596dad 136 ctx->family = family;
26b2f552 137 ctx->level = 0;
128ad332
PNA		 138 ctx->table = table;
139 ctx->chain = chain;
140 ctx->nla = nla;
141 ctx->portid = NETLINK_CB(skb).portid;
142 ctx->report = nlmsg_report(nlh);
c9626a2c 143 ctx->flags = nlh->nlmsg_flags;
128ad332 144 ctx->seq = nlh->nlmsg_seq;
7c95f6d8
PNA		 145}
146
8411b644
PNA		 147static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
148 int msg_type, u32 size, gfp_t gfp)
1081d11b
PNA		 149{
150 struct nft_trans *trans;
151
8411b644 152 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
1081d11b
PNA		 153 if (trans == NULL)
154 return NULL;
155
b380e5c7 156 trans->msg_type = msg_type;
1081d11b
PNA		 157 trans->ctx = *ctx;
158
159 return trans;
160}
161
8411b644
PNA		 162static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
163 int msg_type, u32 size)
164{
165 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
166}
167
1081d11b
PNA		 168static void nft_trans_destroy(struct nft_trans *trans)
169{
170 list_del(&trans->list);
171 kfree(trans);
172}
173
f6ac8585
PNA		 174static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
175{
0854db2a 176 struct nftables_pernet *nft_net;
f6ac8585
PNA		 177 struct net *net = ctx->net;
178 struct nft_trans *trans;
179
180 if (!nft_set_is_anonymous(set))
181 return;
182
d59d2f82 183 nft_net = nft_pernet(net);
0854db2a 184 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
6a0a8d10
PNA		 185 switch (trans->msg_type) {
186 case NFT_MSG_NEWSET:
187 if (nft_trans_set(trans) == set)
188 nft_trans_set_bound(trans) = true;
189 break;
190 case NFT_MSG_NEWSETELEM:
191 if (nft_trans_elem_set(trans) == set)
192 nft_trans_elem_set_bound(trans) = true;
f6ac8585
PNA		 193 break;
194 }
195 }
196}
197
d54725cd
PNA		 198static int nft_netdev_register_hooks(struct net *net,
199 struct list_head *hook_list)
200{
201 struct nft_hook *hook;
202 int err, j;
203
204 j = 0;
205 list_for_each_entry(hook, hook_list, list) {
206 err = nf_register_net_hook(net, &hook->ops);
207 if (err < 0)
208 goto err_register;
209
210 j++;
211 }
212 return 0;
213
214err_register:
215 list_for_each_entry(hook, hook_list, list) {
216 if (j-- <= 0)
217 break;
218
219 nf_unregister_net_hook(net, &hook->ops);
220 }
221 return err;
222}
223
224static void nft_netdev_unregister_hooks(struct net *net,
225 struct list_head *hook_list)
226{
227 struct nft_hook *hook;
228
229 list_for_each_entry(hook, hook_list, list)
230 nf_unregister_net_hook(net, &hook->ops);
231}
232
c974a3a3
PNA		 233static int nf_tables_register_hook(struct net *net,
234 const struct nft_table *table,
235 struct nft_chain *chain)
d8ee8f7c 236{
d54725cd 237 struct nft_base_chain *basechain;
a37061a6 238 const struct nf_hook_ops *ops;
ae6153b5 239
d8ee8f7c 240 if (table->flags & NFT_TABLE_F_DORMANT ||
f323d954 241 !nft_is_base_chain(chain))
d8ee8f7c
PNA		 242 return 0;
243
4e25ceb8
FW		 244 basechain = nft_base_chain(chain);
245 ops = &basechain->ops;
ae6153b5 246
4e25ceb8
FW		 247 if (basechain->type->ops_register)
248 return basechain->type->ops_register(net, ops);
249
d3519cb8 250 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
1e9451cb
FW		 251 return nft_netdev_register_hooks(net, &basechain->hook_list);
252
253 return nf_register_net_hook(net, &basechain->ops);
d8ee8f7c
PNA		 254}
255
c974a3a3
PNA		 256static void nf_tables_unregister_hook(struct net *net,
257 const struct nft_table *table,
258 struct nft_chain *chain)
c5598794 259{
d54725cd 260 struct nft_base_chain *basechain;
4e25ceb8
FW		 261 const struct nf_hook_ops *ops;
262
d8ee8f7c 263 if (table->flags & NFT_TABLE_F_DORMANT ||
f323d954 264 !nft_is_base_chain(chain))
d8ee8f7c 265 return;
4e25ceb8
FW		 266 basechain = nft_base_chain(chain);
267 ops = &basechain->ops;
d8ee8f7c 268
4e25ceb8
FW		 269 if (basechain->type->ops_unregister)
270 return basechain->type->ops_unregister(net, ops);
271
d3519cb8 272 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
1e9451cb
FW		 273 nft_netdev_unregister_hooks(net, &basechain->hook_list);
274 else
275 nf_unregister_net_hook(net, &basechain->ops);
c5598794
AB		 276}
277
0854db2a
FW		 278static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
279{
d59d2f82 280 struct nftables_pernet *nft_net = nft_pernet(net);
0854db2a 281
0854db2a
FW		 282 list_add_tail(&trans->list, &nft_net->commit_list);
283}
284
ee01d542
AB		 285static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
286{
287 struct nft_trans *trans;
288
289 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
290 if (trans == NULL)
291 return -ENOMEM;
292
293 if (msg_type == NFT_MSG_NEWTABLE)
f2a6d766 294 nft_activate_next(ctx->net, ctx->table);
ee01d542 295
0854db2a 296 nft_trans_commit_list_add_tail(ctx->net, trans);
ee01d542
AB		 297 return 0;
298}
299
300static int nft_deltable(struct nft_ctx *ctx)
301{
302 int err;
303
304 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
305 if (err < 0)
306 return err;
307
f2a6d766 308 nft_deactivate_next(ctx->net, ctx->table);
ee01d542
AB		 309 return err;
310}
311
66293c46 312static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
ee01d542
AB		 313{
314 struct nft_trans *trans;
315
316 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
317 if (trans == NULL)
66293c46 318 return ERR_PTR(-ENOMEM);
ee01d542 319
74cccc3d 320 if (msg_type == NFT_MSG_NEWCHAIN) {
664b0f8c 321 nft_activate_next(ctx->net, ctx->chain);
ee01d542 322
74cccc3d
PNA		 323 if (ctx->nla[NFTA_CHAIN_ID]) {
324 nft_trans_chain_id(trans) =
325 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
326 }
327 }
328
0854db2a 329 nft_trans_commit_list_add_tail(ctx->net, trans);
66293c46 330 return trans;
ee01d542
AB		 331}
332
333static int nft_delchain(struct nft_ctx *ctx)
334{
66293c46 335 struct nft_trans *trans;
ee01d542 336
66293c46
FW		 337 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
338 if (IS_ERR(trans))
339 return PTR_ERR(trans);
ee01d542
AB		 340
341 ctx->table->use--;
664b0f8c 342 nft_deactivate_next(ctx->net, ctx->chain);
ee01d542 343
66293c46 344 return 0;
ee01d542
AB		 345}
346
bb7b40ae
PNA		 347static void nft_rule_expr_activate(const struct nft_ctx *ctx,
348 struct nft_rule *rule)
349{
350 struct nft_expr *expr;
351
352 expr = nft_expr_first(rule);
31cc578a 353 while (nft_expr_more(rule, expr)) {
bb7b40ae
PNA		 354 if (expr->ops->activate)
355 expr->ops->activate(ctx, expr);
356
357 expr = nft_expr_next(expr);
358 }
359}
360
361static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
f6ac8585
PNA		 362 struct nft_rule *rule,
363 enum nft_trans_phase phase)
bb7b40ae
PNA		 364{
365 struct nft_expr *expr;
366
367 expr = nft_expr_first(rule);
31cc578a 368 while (nft_expr_more(rule, expr)) {
bb7b40ae 369 if (expr->ops->deactivate)
f6ac8585 370 expr->ops->deactivate(ctx, expr, phase);
bb7b40ae
PNA		 371
372 expr = nft_expr_next(expr);
373 }
374}
375
ee01d542
AB		 376static int
377nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
378{
379 /* You cannot delete the same rule twice */
889f7ee7
PNA		 380 if (nft_is_active_next(ctx->net, rule)) {
381 nft_deactivate_next(ctx->net, rule);
ee01d542
AB		 382 ctx->chain->use--;
383 return 0;
384 }
385 return -ENOENT;
386}
387
388static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
389 struct nft_rule *rule)
390{
391 struct nft_trans *trans;
392
393 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
394 if (trans == NULL)
395 return NULL;
396
1a94e38d
PNA		 397 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
398 nft_trans_rule_id(trans) =
399 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
400 }
ee01d542 401 nft_trans_rule(trans) = rule;
0854db2a 402 nft_trans_commit_list_add_tail(ctx->net, trans);
ee01d542
AB		 403
404 return trans;
405}
406
407static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
408{
63b48c73 409 struct nft_flow_rule *flow;
ee01d542
AB		 410 struct nft_trans *trans;
411 int err;
412
413 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
414 if (trans == NULL)
415 return -ENOMEM;
416
63b48c73
PNA		 417 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
418 flow = nft_flow_rule_create(ctx->net, rule);
419 if (IS_ERR(flow)) {
420 nft_trans_destroy(trans);
421 return PTR_ERR(flow);
422 }
423
424 nft_trans_flow_rule(trans) = flow;
425 }
426
ee01d542
AB		 427 err = nf_tables_delrule_deactivate(ctx, rule);
428 if (err < 0) {
429 nft_trans_destroy(trans);
430 return err;
431 }
f6ac8585 432 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
ee01d542
AB		 433
434 return 0;
435}
436
437static int nft_delrule_by_chain(struct nft_ctx *ctx)
438{
439 struct nft_rule *rule;
440 int err;
441
442 list_for_each_entry(rule, &ctx->chain->rules, list) {
23b7ca4f
PNA		 443 if (!nft_is_active_next(ctx->net, rule))
444 continue;
445
ee01d542
AB		 446 err = nft_delrule(ctx, rule);
447 if (err < 0)
448 return err;
449 }
450 return 0;
451}
452
cd5125d8 453static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
ee01d542
AB		 454 struct nft_set *set)
455{
456 struct nft_trans *trans;
457
458 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
459 if (trans == NULL)
460 return -ENOMEM;
461
462 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
463 nft_trans_set_id(trans) =
464 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
37a9cc52 465 nft_activate_next(ctx->net, set);
ee01d542
AB		 466 }
467 nft_trans_set(trans) = set;
0854db2a 468 nft_trans_commit_list_add_tail(ctx->net, trans);
ee01d542
AB		 469
470 return 0;
471}
472
cd5125d8 473static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
ee01d542
AB		 474{
475 int err;
476
477 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
478 if (err < 0)
479 return err;
480
37a9cc52 481 nft_deactivate_next(ctx->net, set);
ee01d542
AB		 482 ctx->table->use--;
483
484 return err;
485}
486
e5009240
PNA		 487static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
488 struct nft_object *obj)
489{
490 struct nft_trans *trans;
491
492 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
493 if (trans == NULL)
494 return -ENOMEM;
495
496 if (msg_type == NFT_MSG_NEWOBJ)
497 nft_activate_next(ctx->net, obj);
498
499 nft_trans_obj(trans) = obj;
0854db2a 500 nft_trans_commit_list_add_tail(ctx->net, trans);
e5009240
PNA		 501
502 return 0;
503}
504
505static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
506{
507 int err;
508
509 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
510 if (err < 0)
511 return err;
512
513 nft_deactivate_next(ctx->net, obj);
514 ctx->table->use--;
515
516 return err;
517}
518
3b49e2e9
PNA		 519static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
520 struct nft_flowtable *flowtable)
521{
522 struct nft_trans *trans;
523
524 trans = nft_trans_alloc(ctx, msg_type,
525 sizeof(struct nft_trans_flowtable));
526 if (trans == NULL)
527 return -ENOMEM;
528
529 if (msg_type == NFT_MSG_NEWFLOWTABLE)
530 nft_activate_next(ctx->net, flowtable);
531
532 nft_trans_flowtable(trans) = flowtable;
0854db2a 533 nft_trans_commit_list_add_tail(ctx->net, trans);
3b49e2e9
PNA		 534
535 return 0;
536}
537
538static int nft_delflowtable(struct nft_ctx *ctx,
539 struct nft_flowtable *flowtable)
540{
541 int err;
542
543 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
544 if (err < 0)
545 return err;
546
547 nft_deactivate_next(ctx->net, flowtable);
548 ctx->table->use--;
549
550 return err;
551}
552
96518518
PM		 553/*
554 * Tables
555 */
556
36596dad 557static struct nft_table *nft_table_lookup(const struct net *net,
f2a6d766 558 const struct nlattr *nla,
6001a930 559 u8 family, u8 genmask, u32 nlpid)
96518518 560{
0854db2a 561 struct nftables_pernet *nft_net;
96518518
PM		 562 struct nft_table *table;
563
cac20fcd
PNA		 564 if (nla == NULL)
565 return ERR_PTR(-EINVAL);
566
d59d2f82 567 nft_net = nft_pernet(net);
0854db2a
FW		 568 list_for_each_entry_rcu(table, &nft_net->tables, list,
569 lockdep_is_held(&nft_net->commit_mutex)) {
f2a6d766 570 if (!nla_strcmp(nla, table->name) &&
98319cb9 571 table->family == family &&
6001a930
PNA		 572 nft_active_genmask(table, genmask)) {
573 if (nft_table_has_owner(table) &&
53479909 574 nlpid && table->nlpid != nlpid)
6001a930
PNA		 575 return ERR_PTR(-EPERM);
576
96518518 577 return table;
6001a930 578 }
96518518 579 }
cac20fcd
PNA		 580
581 return ERR_PTR(-ENOENT);
96518518
PM		 582}
583
3ecbfd65
HS		 584static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
585 const struct nlattr *nla,
e31f072f 586 u8 genmask, u32 nlpid)
3ecbfd65 587{
0854db2a 588 struct nftables_pernet *nft_net;
3ecbfd65
HS		 589 struct nft_table *table;
590
d59d2f82 591 nft_net = nft_pernet(net);
0854db2a 592 list_for_each_entry(table, &nft_net->tables, list) {
3ecbfd65 593 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
e31f072f
PNA		 594 nft_active_genmask(table, genmask)) {
595 if (nft_table_has_owner(table) &&
596 nlpid && table->nlpid != nlpid)
597 return ERR_PTR(-EPERM);
598
3ecbfd65 599 return table;
e31f072f 600 }
3ecbfd65 601 }
3ecbfd65
HS		 602
603 return ERR_PTR(-ENOENT);
604}
605
96518518
PM		 606static inline u64 nf_tables_alloc_handle(struct nft_table *table)
607{
608 return ++table->hgenerator;
609}
610
32537e91 611static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
9370761c 612
82603549
PNA		 613static const struct nft_chain_type *
614__nft_chain_type_get(u8 family, enum nft_chain_types type)
615{
616 if (family >= NFPROTO_NUMPROTO ||
617 type >= NFT_CHAIN_T_MAX)
618 return NULL;
619
620 return chain_type[family][type];
621}
622
32537e91 623static const struct nft_chain_type *
1ea26cca 624__nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
9370761c 625{
82603549 626 const struct nft_chain_type *type;
9370761c
PNA		 627 int i;
628
baae3e62 629 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
82603549
PNA		 630 type = __nft_chain_type_get(family, i);
631 if (!type)
632 continue;
633 if (!nla_strcmp(nla, type->name))
634 return type;
9370761c 635 }
baae3e62 636 return NULL;
9370761c
PNA		 637}
638
eb014de4
PNA		 639struct nft_module_request {
640 struct list_head list;
641 char module[MODULE_NAME_LEN];
642 bool done;
643};
644
452238e8 645#ifdef CONFIG_MODULES
cefa31a9
FW		 646__printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
647 ...)
452238e8
FW		 648{
649 char module_name[MODULE_NAME_LEN];
0854db2a 650 struct nftables_pernet *nft_net;
eb014de4 651 struct nft_module_request *req;
452238e8
FW		 652 va_list args;
653 int ret;
654
452238e8
FW		 655 va_start(args, fmt);
656 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
657 va_end(args);
9332d27d 658 if (ret >= MODULE_NAME_LEN)
eb014de4 659 return 0;
452238e8 660
d59d2f82 661 nft_net = nft_pernet(net);
0854db2a 662 list_for_each_entry(req, &nft_net->module_list, list) {
eb014de4
PNA		 663 if (!strcmp(req->module, module_name)) {
664 if (req->done)
665 return 0;
ec7470b8 666
eb014de4
PNA		 667 /* A request to load this module already exists. */
668 return -EAGAIN;
669 }
670 }
671
672 req = kmalloc(sizeof(*req), GFP_KERNEL);
673 if (!req)
674 return -ENOMEM;
675
676 req->done = false;
677 strlcpy(req->module, module_name, MODULE_NAME_LEN);
0854db2a 678 list_add_tail(&req->list, &nft_net->module_list);
eb014de4
PNA		 679
680 return -EAGAIN;
452238e8 681}
cefa31a9 682EXPORT_SYMBOL_GPL(nft_request_module);
452238e8
FW		 683#endif
684
f102d66b
FW		 685static void lockdep_nfnl_nft_mutex_not_held(void)
686{
687#ifdef CONFIG_PROVE_LOCKING
c0700dfa
FW		 688 if (debug_locks)
689 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
f102d66b
FW		 690#endif
691}
692
32537e91 693static const struct nft_chain_type *
452238e8
FW		 694nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
695 u8 family, bool autoload)
9370761c 696{
32537e91 697 const struct nft_chain_type *type;
9370761c 698
1ea26cca 699 type = __nf_tables_chain_type_lookup(nla, family);
93b0806f
PM		 700 if (type != NULL)
701 return type;
f102d66b
FW		 702
703 lockdep_nfnl_nft_mutex_not_held();
9370761c 704#ifdef CONFIG_MODULES
93b0806f 705 if (autoload) {
eb014de4
PNA		 706 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
707 nla_len(nla),
708 (const char *)nla_data(nla)) == -EAGAIN)
93b0806f 709 return ERR_PTR(-EAGAIN);
9370761c
PNA		 710 }
711#endif
93b0806f 712 return ERR_PTR(-ENOENT);
9370761c
PNA		 713}
714
802b8051
PNA		 715static __be16 nft_base_seq(const struct net *net)
716{
d59d2f82 717 struct nftables_pernet *nft_net = nft_pernet(net);
0854db2a
FW		 718
719 return htons(nft_net->base_seq & 0xffff);
802b8051
PNA		 720}
721
96518518 722static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
1cae565e
PNA		 723 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
724 .len = NFT_TABLE_MAXNAMELEN - 1 },
9ddf6323 725 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
3ecbfd65 726 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
7a81575b
JGG		 727 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
728 .len = NFT_USERDATA_MAXLEN }
96518518
PM		 729};
730
84d7fce6
PNA		 731static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
732 u32 portid, u32 seq, int event, u32 flags,
733 int family, const struct nft_table *table)
96518518
PM		 734{
735 struct nlmsghdr *nlh;
96518518 736
dedb67c4 737 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
19c28b13
PNA		 738 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
739 NFNETLINK_V0, nft_base_seq(net));
740 if (!nlh)
96518518
PM		 741 goto nla_put_failure;
742
9ddf6323 743 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
179d9ba5
PNA		 744 nla_put_be32(skb, NFTA_TABLE_FLAGS,
745 htonl(table->flags & NFT_TABLE_F_MASK)) ||
3ecbfd65
HS		 746 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
747 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
748 NFTA_TABLE_PAD))
96518518 749 goto nla_put_failure;
6001a930
PNA		 750 if (nft_table_has_owner(table) &&
751 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
752 goto nla_put_failure;
96518518 753
7a81575b
JGG		 754 if (table->udata) {
755 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
756 goto nla_put_failure;
757 }
758
053c095a
JB		 759 nlmsg_end(skb, nlh);
760 return 0;
96518518
PM		 761
762nla_put_failure:
763 nlmsg_trim(skb, nlh);
764 return -1;
765}
766
67cc570e
PNA		 767struct nftnl_skb_parms {
768 bool report;
769};
770#define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
771
772static void nft_notify_enqueue(struct sk_buff *skb, bool report,
773 struct list_head *notify_list)
774{
775 NFT_CB(skb).report = report;
776 list_add_tail(&skb->list, notify_list);
777}
778
25e94a99 779static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
96518518 780{
0854db2a 781 struct nftables_pernet *nft_net;
96518518 782 struct sk_buff *skb;
6fb721cf 783 u16 flags = 0;
96518518
PM		 784 int err;
785
128ad332
PNA		 786 if (!ctx->report &&
787 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 788 return;
96518518 789
96518518
PM		 790 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
791 if (skb == NULL)
792 goto err;
793
6fb721cf
PNA		 794 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
795 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
796
84d7fce6 797 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
6fb721cf 798 event, flags, ctx->family, ctx->table);
96518518
PM		 799 if (err < 0) {
800 kfree_skb(skb);
801 goto err;
802 }
803
d59d2f82 804 nft_net = nft_pernet(ctx->net);
0854db2a 805 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
25e94a99 806 return;
96518518 807err:
25e94a99 808 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 809}
810
811static int nf_tables_dump_tables(struct sk_buff *skb,
812 struct netlink_callback *cb)
813{
814 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
0854db2a 815 struct nftables_pernet *nft_net;
96518518
PM		 816 const struct nft_table *table;
817 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 818 struct net *net = sock_net(skb->sk);
96518518
PM		 819 int family = nfmsg->nfgen_family;
820
e688a7f8 821 rcu_read_lock();
d59d2f82 822 nft_net = nft_pernet(net);
0854db2a 823 cb->seq = nft_net->base_seq;
38e029f1 824
0854db2a 825 list_for_each_entry_rcu(table, &nft_net->tables, list) {
98319cb9 826 if (family != NFPROTO_UNSPEC && family != table->family)
96518518
PM		 827 continue;
828
36596dad
PNA		 829 if (idx < s_idx)
830 goto cont;
831 if (idx > s_idx)
832 memset(&cb->args[1], 0,
833 sizeof(cb->args) - sizeof(cb->args[0]));
834 if (!nft_is_active(net, table))
835 continue;
836 if (nf_tables_fill_table_info(skb, net,
837 NETLINK_CB(cb->skb).portid,
838 cb->nlh->nlmsg_seq,
839 NFT_MSG_NEWTABLE, NLM_F_MULTI,
98319cb9 840 table->family, table) < 0)
36596dad
PNA		 841 goto done;
842
843 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518 844cont:
36596dad 845 idx++;
96518518
PM		 846 }
847done:
e688a7f8 848 rcu_read_unlock();
96518518
PM		 849 cb->args[0] = idx;
850 return skb->len;
851}
852
d9adf22a
FW		 853static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
854 const struct nlmsghdr *nlh,
855 struct netlink_dump_control *c)
856{
857 int err;
858
859 if (!try_module_get(THIS_MODULE))
860 return -EINVAL;
861
862 rcu_read_unlock();
863 err = netlink_dump_start(nlsk, skb, nlh, c);
864 rcu_read_lock();
865 module_put(THIS_MODULE);
866
867 return err;
868}
869
870/* called with rcu_read_lock held */
797d4980
PNA		 871static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
872 const struct nlattr * const nla[])
96518518 873{
797d4980
PNA		 874 struct netlink_ext_ack *extack = info->extack;
875 u8 genmask = nft_genmask_cur(info->net);
ef4b65e5 876 u8 family = info->nfmsg->nfgen_family;
96518518 877 const struct nft_table *table;
797d4980 878 struct net *net = info->net;
96518518 879 struct sk_buff *skb2;
96518518
PM		 880 int err;
881
797d4980 882 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
96518518
PM		 883 struct netlink_dump_control c = {
884 .dump = nf_tables_dump_tables,
d9adf22a 885 .module = THIS_MODULE,
96518518 886 };
d9adf22a 887
797d4980 888 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
96518518
PM		 889 }
890
6001a930 891 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
36dd1bcc
PNA		 892 if (IS_ERR(table)) {
893 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
96518518 894 return PTR_ERR(table);
36dd1bcc 895 }
96518518 896
d9adf22a 897 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
96518518
PM		 898 if (!skb2)
899 return -ENOMEM;
900
84d7fce6 901 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
797d4980
PNA		 902 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
903 0, family, table);
96518518 904 if (err < 0)
ee921183 905 goto err_fill_table_info;
96518518 906
ee921183 907 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
96518518 908
ee921183 909err_fill_table_info:
96518518
PM		 910 kfree_skb(skb2);
911 return err;
912}
913
c9c17211 914static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
10435c11
F		 915{
916 struct nft_chain *chain;
917 u32 i = 0;
918
919 list_for_each_entry(chain, &table->chains, list) {
920 if (!nft_is_active_next(net, chain))
921 continue;
f323d954 922 if (!nft_is_base_chain(chain))
10435c11
F		 923 continue;
924
925 if (cnt && i++ == cnt)
926 break;
927
1e9451cb 928 nf_tables_unregister_hook(net, table, chain);
10435c11
F		 929 }
930}
931
c9c17211 932static int nf_tables_table_enable(struct net *net, struct nft_table *table)
9ddf6323
PNA		 933{
934 struct nft_chain *chain;
935 int err, i = 0;
936
937 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 938 if (!nft_is_active_next(net, chain))
939 continue;
f323d954 940 if (!nft_is_base_chain(chain))
d2012975
PNA		 941 continue;
942
1e9451cb 943 err = nf_tables_register_hook(net, table, chain);
9ddf6323 944 if (err < 0)
d54725cd 945 goto err_register_hooks;
9ddf6323
PNA		 946
947 i++;
948 }
949 return 0;
d54725cd
PNA		 950
951err_register_hooks:
10435c11 952 if (i)
c9c17211 953 nft_table_disable(net, table, i);
9ddf6323
PNA		 954 return err;
955}
956
c9c17211 957static void nf_tables_table_disable(struct net *net, struct nft_table *table)
9ddf6323 958{
179d9ba5 959 table->flags &= ~NFT_TABLE_F_DORMANT;
c9c17211 960 nft_table_disable(net, table, 0);
179d9ba5 961 table->flags |= NFT_TABLE_F_DORMANT;
9ddf6323
PNA		 962}
963
179d9ba5
PNA		 964#define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
965#define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
966#define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
967#define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
968 __NFT_TABLE_F_WAS_AWAKEN)
0ce7cf41 969
e1aaca93 970static int nf_tables_updtable(struct nft_ctx *ctx)
9ddf6323 971{
55dd6f93 972 struct nft_trans *trans;
e1aaca93 973 u32 flags;
179d9ba5 974 int ret;
9ddf6323 975
e1aaca93
PNA		 976 if (!ctx->nla[NFTA_TABLE_FLAGS])
977 return 0;
9ddf6323 978
e1aaca93 979 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
6001a930
PNA		 980 if (flags & ~NFT_TABLE_F_MASK)
981 return -EOPNOTSUPP;
e1aaca93 982
63283dd2
PNA		 983 if (flags == ctx->table->flags)
984 return 0;
985
9cc0001a
PNA		 986 if ((nft_table_has_owner(ctx->table) &&
987 !(flags & NFT_TABLE_F_OWNER)) ||
988 (!nft_table_has_owner(ctx->table) &&
989 flags & NFT_TABLE_F_OWNER))
990 return -EOPNOTSUPP;
991
55dd6f93
PNA		 992 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
993 sizeof(struct nft_trans_table));
994 if (trans == NULL)
995 return -ENOMEM;
9ddf6323 996
e1aaca93
PNA		 997 if ((flags & NFT_TABLE_F_DORMANT) &&
998 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
179d9ba5
PNA		 999 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1000 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1001 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
e1aaca93
PNA		 1002 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1003 ctx->table->flags & NFT_TABLE_F_DORMANT) {
179d9ba5
PNA		 1004 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1005 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1006 ret = nf_tables_table_enable(ctx->net, ctx->table);
1007 if (ret < 0)
1008 goto err_register_hooks;
1009
1010 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1011 }
9ddf6323
PNA		 1012 }
1013
55dd6f93 1014 nft_trans_table_update(trans) = true;
0854db2a 1015 nft_trans_commit_list_add_tail(ctx->net, trans);
179d9ba5 1016
55dd6f93 1017 return 0;
179d9ba5
PNA		 1018
1019err_register_hooks:
55dd6f93 1020 nft_trans_destroy(trans);
9ddf6323
PNA		 1021 return ret;
1022}
1023
1b2470e5
FW		 1024static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1025{
1026 const char *name = data;
1027
1028 return jhash(name, strlen(name), seed);
1029}
1030
1031static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1032{
1033 const struct nft_chain *chain = data;
1034
1035 return nft_chain_hash(chain->name, 0, seed);
1036}
1037
1038static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1039 const void *ptr)
1040{
1041 const struct nft_chain *chain = ptr;
1042 const char *name = arg->key;
1043
1044 return strcmp(chain->name, name);
1045}
1046
4d44175a
FW		 1047static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1048{
1049 const struct nft_object_hash_key *k = data;
1050
1051 seed ^= hash_ptr(k->table, 32);
1052
1053 return jhash(k->name, strlen(k->name), seed);
1054}
1055
1056static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1057{
1058 const struct nft_object *obj = data;
1059
1060 return nft_objname_hash(&obj->key, 0, seed);
1061}
1062
1063static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1064 const void *ptr)
1065{
1066 const struct nft_object_hash_key *k = arg->key;
1067 const struct nft_object *obj = ptr;
1068
1069 if (obj->key.table != k->table)
1070 return -1;
1071
1072 return strcmp(obj->key.name, k->name);
1073}
1074
7dab8ee3
PNA		 1075static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1076 const struct nlattr * const nla[])
96518518 1077{
7dab8ee3 1078 struct nftables_pernet *nft_net = nft_pernet(info->net);
7dab8ee3
PNA		 1079 struct netlink_ext_ack *extack = info->extack;
1080 u8 genmask = nft_genmask_next(info->net);
ef4b65e5 1081 u8 family = info->nfmsg->nfgen_family;
7dab8ee3 1082 struct net *net = info->net;
36dd1bcc
PNA		 1083 const struct nlattr *attr;
1084 struct nft_table *table;
e1aaca93 1085 struct nft_ctx ctx;
7a81575b 1086 u32 flags = 0;
55dd6f93 1087 int err;
96518518 1088
0854db2a 1089 lockdep_assert_held(&nft_net->commit_mutex);
36dd1bcc 1090 attr = nla[NFTA_TABLE_NAME];
6001a930
PNA		 1091 table = nft_table_lookup(net, attr, family, genmask,
1092 NETLINK_CB(skb).portid);
96518518
PM		 1093 if (IS_ERR(table)) {
1094 if (PTR_ERR(table) != -ENOENT)
1095 return PTR_ERR(table);
1a28ad74 1096 } else {
7dab8ee3 1097 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
36dd1bcc 1098 NL_SET_BAD_ATTR(extack, attr);
96518518 1099 return -EEXIST;
36dd1bcc 1100 }
7dab8ee3 1101 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
96518518 1102 return -EOPNOTSUPP;
e1aaca93 1103
7dab8ee3
PNA		 1104 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1105
e1aaca93 1106 return nf_tables_updtable(&ctx);
96518518
PM		 1107 }
1108
c5c1f975
PM		 1109 if (nla[NFTA_TABLE_FLAGS]) {
1110 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
6001a930
PNA		 1111 if (flags & ~NFT_TABLE_F_MASK)
1112 return -EOPNOTSUPP;
c5c1f975
PM		 1113 }
1114
ffdb210e 1115 err = -ENOMEM;
1cae565e 1116 table = kzalloc(sizeof(*table), GFP_KERNEL);
ffdb210e 1117 if (table == NULL)
98319cb9 1118 goto err_kzalloc;
96518518 1119
36dd1bcc 1120 table->name = nla_strdup(attr, GFP_KERNEL);
e46abbcc 1121 if (table->name == NULL)
98319cb9 1122 goto err_strdup;
e46abbcc 1123
7a81575b 1124 if (nla[NFTA_TABLE_USERDATA]) {
85db827a 1125 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL);
7a81575b
JGG		 1126 if (table->udata == NULL)
1127 goto err_table_udata;
1128
85db827a 1129 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
7a81575b
JGG		 1130 }
1131
1b2470e5
FW		 1132 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1133 if (err)
1134 goto err_chain_ht;
1135
96518518 1136 INIT_LIST_HEAD(&table->chains);
20a69341 1137 INIT_LIST_HEAD(&table->sets);
e5009240 1138 INIT_LIST_HEAD(&table->objects);
3b49e2e9 1139 INIT_LIST_HEAD(&table->flowtables);
98319cb9 1140 table->family = family;
c5c1f975 1141 table->flags = flags;
3ecbfd65 1142 table->handle = ++table_handle;
6001a930
PNA		 1143 if (table->flags & NFT_TABLE_F_OWNER)
1144 table->nlpid = NETLINK_CB(skb).portid;
9ddf6323 1145
7dab8ee3 1146 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
55dd6f93 1147 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
ffdb210e 1148 if (err < 0)
98319cb9 1149 goto err_trans;
ffdb210e 1150
0854db2a 1151 list_add_tail_rcu(&table->list, &nft_net->tables);
96518518 1152 return 0;
98319cb9 1153err_trans:
1b2470e5
FW		 1154 rhltable_destroy(&table->chains_ht);
1155err_chain_ht:
7a81575b
JGG		 1156 kfree(table->udata);
1157err_table_udata:
e46abbcc 1158 kfree(table->name);
98319cb9 1159err_strdup:
ffdb210e 1160 kfree(table);
98319cb9 1161err_kzalloc:
ffdb210e 1162 return err;
96518518
PM		 1163}
1164
b9ac12ef
AB		 1165static int nft_flush_table(struct nft_ctx *ctx)
1166{
3b49e2e9 1167 struct nft_flowtable *flowtable, *nft;
b9ac12ef 1168 struct nft_chain *chain, *nc;
e5009240 1169 struct nft_object *obj, *ne;
b9ac12ef 1170 struct nft_set *set, *ns;
3b49e2e9 1171 int err;
b9ac12ef 1172
a2f18db0 1173 list_for_each_entry(chain, &ctx->table->chains, list) {
664b0f8c
PNA		 1174 if (!nft_is_active_next(ctx->net, chain))
1175 continue;
1176
d0e2c7de
PNA		 1177 if (nft_chain_is_bound(chain))
1178 continue;
1179
b9ac12ef
AB		 1180 ctx->chain = chain;
1181
1182 err = nft_delrule_by_chain(ctx);
1183 if (err < 0)
1184 goto out;
b9ac12ef
AB		 1185 }
1186
1187 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
37a9cc52
PNA		 1188 if (!nft_is_active_next(ctx->net, set))
1189 continue;
1190
408070d6 1191 if (nft_set_is_anonymous(set) &&
b9ac12ef
AB		 1192 !list_empty(&set->bindings))
1193 continue;
1194
1195 err = nft_delset(ctx, set);
1196 if (err < 0)
1197 goto out;
1198 }
1199
3b49e2e9 1200 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
335178d5
FW		 1201 if (!nft_is_active_next(ctx->net, flowtable))
1202 continue;
1203
3b49e2e9
PNA		 1204 err = nft_delflowtable(ctx, flowtable);
1205 if (err < 0)
1206 goto out;
1207 }
1208
e5009240 1209 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
335178d5
FW		 1210 if (!nft_is_active_next(ctx->net, obj))
1211 continue;
1212
e5009240
PNA		 1213 err = nft_delobj(ctx, obj);
1214 if (err < 0)
1215 goto out;
1216 }
1217
a2f18db0 1218 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
664b0f8c
PNA		 1219 if (!nft_is_active_next(ctx->net, chain))
1220 continue;
1221
d0e2c7de
PNA		 1222 if (nft_chain_is_bound(chain))
1223 continue;
1224
a2f18db0
PNA		 1225 ctx->chain = chain;
1226
1227 err = nft_delchain(ctx);
1228 if (err < 0)
1229 goto out;
1230 }
1231
b9ac12ef
AB		 1232 err = nft_deltable(ctx);
1233out:
1234 return err;
1235}
1236
1237static int nft_flush(struct nft_ctx *ctx, int family)
1238{
d59d2f82 1239 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
b9ac12ef 1240 const struct nlattr * const *nla = ctx->nla;
d59d2f82 1241 struct nft_table *table, *nt;
b9ac12ef
AB		 1242 int err = 0;
1243
0854db2a 1244 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
98319cb9 1245 if (family != AF_UNSPEC && table->family != family)
b9ac12ef
AB		 1246 continue;
1247
98319cb9 1248 ctx->family = table->family;
f2a6d766 1249
36596dad
PNA		 1250 if (!nft_is_active_next(ctx->net, table))
1251 continue;
b9ac12ef 1252
6001a930
PNA		 1253 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1254 continue;
1255
36596dad
PNA		 1256 if (nla[NFTA_TABLE_NAME] &&
1257 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1258 continue;
b9ac12ef 1259
36596dad
PNA		 1260 ctx->table = table;
1261
1262 err = nft_flush_table(ctx);
1263 if (err < 0)
1264 goto out;
b9ac12ef
AB		 1265 }
1266out:
1267 return err;
1268}
1269
7dab8ee3
PNA		 1270static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1271 const struct nlattr * const nla[])
96518518 1272{
7dab8ee3
PNA		 1273 struct netlink_ext_ack *extack = info->extack;
1274 u8 genmask = nft_genmask_next(info->net);
ef4b65e5 1275 u8 family = info->nfmsg->nfgen_family;
7dab8ee3 1276 struct net *net = info->net;
36dd1bcc
PNA		 1277 const struct nlattr *attr;
1278 struct nft_table *table;
55dd6f93 1279 struct nft_ctx ctx;
96518518 1280
7dab8ee3 1281 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
3ecbfd65
HS		 1282 if (family == AF_UNSPEC ||
1283 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
b9ac12ef
AB		 1284 return nft_flush(&ctx, family);
1285
36dd1bcc
PNA		 1286 if (nla[NFTA_TABLE_HANDLE]) {
1287 attr = nla[NFTA_TABLE_HANDLE];
e31f072f
PNA		 1288 table = nft_table_lookup_byhandle(net, attr, genmask,
1289 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 1290 } else {
1291 attr = nla[NFTA_TABLE_NAME];
6001a930
PNA		 1292 table = nft_table_lookup(net, attr, family, genmask,
1293 NETLINK_CB(skb).portid);
36dd1bcc 1294 }
3ecbfd65 1295
36dd1bcc
PNA		 1296 if (IS_ERR(table)) {
1297 NL_SET_BAD_ATTR(extack, attr);
96518518 1298 return PTR_ERR(table);
36dd1bcc 1299 }
96518518 1300
7dab8ee3 1301 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
a8278400
PNA		 1302 table->use > 0)
1303 return -EBUSY;
1304
98319cb9 1305 ctx.family = family;
b9ac12ef 1306 ctx.table = table;
55dd6f93 1307
b9ac12ef 1308 return nft_flush_table(&ctx);
96518518
PM		 1309}
1310
55dd6f93
PNA		 1311static void nf_tables_table_destroy(struct nft_ctx *ctx)
1312{
fa5950e4
FW		 1313 if (WARN_ON(ctx->table->use > 0))
1314 return;
4fefee57 1315
1b2470e5 1316 rhltable_destroy(&ctx->table->chains_ht);
e46abbcc 1317 kfree(ctx->table->name);
bc7a7082 1318 kfree(ctx->table->udata);
55dd6f93 1319 kfree(ctx->table);
55dd6f93
PNA		 1320}
1321
cc07eeb0 1322void nft_register_chain_type(const struct nft_chain_type *ctype)
96518518 1323{
96518518 1324 nfnl_lock(NFNL_SUBSYS_NFTABLES);
82603549 1325 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
cc07eeb0
PNA		 1326 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1327 return;
96518518 1328 }
9370761c 1329 chain_type[ctype->family][ctype->type] = ctype;
96518518 1330 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
96518518 1331}
9370761c 1332EXPORT_SYMBOL_GPL(nft_register_chain_type);
96518518 1333
32537e91 1334void nft_unregister_chain_type(const struct nft_chain_type *ctype)
96518518 1335{
96518518 1336 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c 1337 chain_type[ctype->family][ctype->type] = NULL;
96518518
PM		 1338 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1339}
9370761c 1340EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
96518518
PM		 1341
1342/*
1343 * Chains
1344 */
1345
1346static struct nft_chain *
cac20fcd 1347nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
96518518
PM		 1348{
1349 struct nft_chain *chain;
1350
1351 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 1352 if (chain->handle == handle &&
1353 nft_active_genmask(chain, genmask))
96518518
PM		 1354 return chain;
1355 }
1356
1357 return ERR_PTR(-ENOENT);
1358}
1359
4d44175a 1360static bool lockdep_commit_lock_is_held(const struct net *net)
f102d66b
FW		 1361{
1362#ifdef CONFIG_PROVE_LOCKING
d59d2f82 1363 struct nftables_pernet *nft_net = nft_pernet(net);
0854db2a
FW		 1364
1365 return lockdep_is_held(&nft_net->commit_mutex);
f102d66b
FW		 1366#else
1367 return true;
1368#endif
1369}
1370
1371static struct nft_chain *nft_chain_lookup(struct net *net,
1372 struct nft_table *table,
cac20fcd 1373 const struct nlattr *nla, u8 genmask)
96518518 1374{
1b2470e5
FW		 1375 char search[NFT_CHAIN_MAXNAMELEN + 1];
1376 struct rhlist_head *tmp, *list;
96518518
PM		 1377 struct nft_chain *chain;
1378
1379 if (nla == NULL)
1380 return ERR_PTR(-EINVAL);
1381
872f6903 1382 nla_strscpy(search, nla, sizeof(search));
96518518 1383
1b2470e5 1384 WARN_ON(!rcu_read_lock_held() &&
f102d66b 1385 !lockdep_commit_lock_is_held(net));
1b2470e5
FW		 1386
1387 chain = ERR_PTR(-ENOENT);
1388 rcu_read_lock();
1389 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1390 if (!list)
1391 goto out_unlock;
1392
1393 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1394 if (nft_active_genmask(chain, genmask))
1395 goto out_unlock;
1396 }
1397 chain = ERR_PTR(-ENOENT);
1398out_unlock:
1399 rcu_read_unlock();
1400 return chain;
96518518
PM		 1401}
1402
1403static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
b2fbd044
LZ		 1404 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1405 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 1406 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1407 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1408 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1409 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
0ca743a5 1410 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
9332d27d
FW		 1411 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1412 .len = NFT_MODULE_AUTOLOAD_LIMIT },
0ca743a5 1413 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
c9626a2c 1414 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
74cccc3d 1415 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
002f2176
JGG		 1416 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1417 .len = NFT_USERDATA_MAXLEN },
96518518
PM		 1418};
1419
1420static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1421 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1422 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
2cbce139
PNA		 1423 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1424 .len = IFNAMSIZ - 1 },
96518518
PM		 1425};
1426
0ca743a5
PNA		 1427static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1428{
1429 struct nft_stats *cpu_stats, total;
1430 struct nlattr *nest;
ce355e20
ED		 1431 unsigned int seq;
1432 u64 pkts, bytes;
0ca743a5
PNA		 1433 int cpu;
1434
edbd82c5
FW		 1435 if (!stats)
1436 return 0;
1437
0ca743a5
PNA		 1438 memset(&total, 0, sizeof(total));
1439 for_each_possible_cpu(cpu) {
1440 cpu_stats = per_cpu_ptr(stats, cpu);
ce355e20
ED		 1441 do {
1442 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1443 pkts = cpu_stats->pkts;
1444 bytes = cpu_stats->bytes;
1445 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1446 total.pkts += pkts;
1447 total.bytes += bytes;
0ca743a5 1448 }
ae0be8de 1449 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
0ca743a5
PNA		 1450 if (nest == NULL)
1451 goto nla_put_failure;
1452
b46f6ded
ND		 1453 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1454 NFTA_COUNTER_PAD) ||
1455 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1456 NFTA_COUNTER_PAD))
0ca743a5
PNA		 1457 goto nla_put_failure;
1458
1459 nla_nest_end(skb, nest);
1460 return 0;
1461
1462nla_put_failure:
1463 return -ENOSPC;
1464}
1465
d54725cd
PNA		 1466static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1467 const struct nft_base_chain *basechain)
1468{
1469 const struct nf_hook_ops *ops = &basechain->ops;
1470 struct nft_hook *hook, *first = NULL;
1471 struct nlattr *nest, *nest_devs;
1472 int n = 0;
1473
1474 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1475 if (nest == NULL)
1476 goto nla_put_failure;
1477 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1478 goto nla_put_failure;
1479 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1480 goto nla_put_failure;
1481
d3519cb8 1482 if (nft_base_chain_netdev(family, ops->hooknum)) {
d54725cd
PNA		 1483 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1484 list_for_each_entry(hook, &basechain->hook_list, list) {
1485 if (!first)
1486 first = hook;
1487
1488 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1489 hook->ops.dev->name))
1490 goto nla_put_failure;
1491 n++;
1492 }
1493 nla_nest_end(skb, nest_devs);
1494
1495 if (n == 1 &&
1496 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1497 goto nla_put_failure;
1498 }
1499 nla_nest_end(skb, nest);
1500
1501 return 0;
1502nla_put_failure:
1503 return -1;
1504}
1505
84d7fce6
PNA		 1506static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1507 u32 portid, u32 seq, int event, u32 flags,
1508 int family, const struct nft_table *table,
96518518
PM		 1509 const struct nft_chain *chain)
1510{
1511 struct nlmsghdr *nlh;
96518518 1512
dedb67c4 1513 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
19c28b13
PNA		 1514 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1515 NFNETLINK_V0, nft_base_seq(net));
1516 if (!nlh)
96518518
PM		 1517 goto nla_put_failure;
1518
96518518
PM		 1519 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1520 goto nla_put_failure;
b46f6ded
ND		 1521 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1522 NFTA_CHAIN_PAD))
96518518
PM		 1523 goto nla_put_failure;
1524 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1525 goto nla_put_failure;
1526
f323d954 1527 if (nft_is_base_chain(chain)) {
0ca743a5 1528 const struct nft_base_chain *basechain = nft_base_chain(chain);
edbd82c5 1529 struct nft_stats __percpu *stats;
0ca743a5 1530
d54725cd 1531 if (nft_dump_basechain_hook(skb, family, basechain))
2cbce139 1532 goto nla_put_failure;
9370761c 1533
0ca743a5
PNA		 1534 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1535 htonl(basechain->policy)))
1536 goto nla_put_failure;
1537
baae3e62
PM		 1538 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1539 goto nla_put_failure;
0ca743a5 1540
edbd82c5
FW		 1541 stats = rcu_dereference_check(basechain->stats,
1542 lockdep_commit_lock_is_held(net));
1543 if (nft_dump_stats(skb, stats))
0ca743a5 1544 goto nla_put_failure;
96518518
PM		 1545 }
1546
d0e2c7de
PNA		 1547 if (chain->flags &&
1548 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1549 goto nla_put_failure;
1550
0ca743a5
PNA		 1551 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1552 goto nla_put_failure;
1553
002f2176
JGG		 1554 if (chain->udata &&
1555 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1556 goto nla_put_failure;
1557
053c095a
JB		 1558 nlmsg_end(skb, nlh);
1559 return 0;
96518518
PM		 1560
1561nla_put_failure:
1562 nlmsg_trim(skb, nlh);
1563 return -1;
1564}
1565
25e94a99 1566static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
96518518 1567{
0854db2a 1568 struct nftables_pernet *nft_net;
96518518 1569 struct sk_buff *skb;
6fb721cf 1570 u16 flags = 0;
96518518
PM		 1571 int err;
1572
128ad332
PNA		 1573 if (!ctx->report &&
1574 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 1575 return;
96518518 1576
96518518
PM		 1577 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1578 if (skb == NULL)
1579 goto err;
1580
6fb721cf
PNA		 1581 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1582 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1583
84d7fce6 1584 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
6fb721cf 1585 event, flags, ctx->family, ctx->table,
35151d84 1586 ctx->chain);
96518518
PM		 1587 if (err < 0) {
1588 kfree_skb(skb);
1589 goto err;
1590 }
1591
d59d2f82 1592 nft_net = nft_pernet(ctx->net);
0854db2a 1593 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
25e94a99 1594 return;
96518518 1595err:
25e94a99 1596 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 1597}
1598
1599static int nf_tables_dump_chains(struct sk_buff *skb,
1600 struct netlink_callback *cb)
1601{
1602 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
96518518 1603 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1604 struct net *net = sock_net(skb->sk);
96518518 1605 int family = nfmsg->nfgen_family;
0854db2a 1606 struct nftables_pernet *nft_net;
d59d2f82
PNA		 1607 const struct nft_table *table;
1608 const struct nft_chain *chain;
96518518 1609
e688a7f8 1610 rcu_read_lock();
d59d2f82 1611 nft_net = nft_pernet(net);
0854db2a 1612 cb->seq = nft_net->base_seq;
38e029f1 1613
0854db2a 1614 list_for_each_entry_rcu(table, &nft_net->tables, list) {
98319cb9 1615 if (family != NFPROTO_UNSPEC && family != table->family)
96518518
PM		 1616 continue;
1617
36596dad
PNA		 1618 list_for_each_entry_rcu(chain, &table->chains, list) {
1619 if (idx < s_idx)
1620 goto cont;
1621 if (idx > s_idx)
1622 memset(&cb->args[1], 0,
1623 sizeof(cb->args) - sizeof(cb->args[0]));
1624 if (!nft_is_active(net, chain))
1625 continue;
1626 if (nf_tables_fill_chain_info(skb, net,
1627 NETLINK_CB(cb->skb).portid,
1628 cb->nlh->nlmsg_seq,
1629 NFT_MSG_NEWCHAIN,
1630 NLM_F_MULTI,
98319cb9 1631 table->family, table,
36596dad
PNA		 1632 chain) < 0)
1633 goto done;
38e029f1 1634
36596dad 1635 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518 1636cont:
36596dad 1637 idx++;
96518518
PM		 1638 }
1639 }
1640done:
e688a7f8 1641 rcu_read_unlock();
96518518
PM		 1642 cb->args[0] = idx;
1643 return skb->len;
1644}
1645
d9adf22a 1646/* called with rcu_read_lock held */
797d4980
PNA		 1647static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1648 const struct nlattr * const nla[])
96518518 1649{
797d4980
PNA		 1650 struct netlink_ext_ack *extack = info->extack;
1651 u8 genmask = nft_genmask_cur(info->net);
ef4b65e5 1652 u8 family = info->nfmsg->nfgen_family;
96518518 1653 const struct nft_chain *chain;
797d4980 1654 struct net *net = info->net;
1b2470e5 1655 struct nft_table *table;
96518518 1656 struct sk_buff *skb2;
96518518
PM		 1657 int err;
1658
797d4980 1659 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
96518518
PM		 1660 struct netlink_dump_control c = {
1661 .dump = nf_tables_dump_chains,
d9adf22a 1662 .module = THIS_MODULE,
96518518 1663 };
d9adf22a 1664
797d4980 1665 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
96518518
PM		 1666 }
1667
6001a930 1668 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
36dd1bcc
PNA		 1669 if (IS_ERR(table)) {
1670 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
96518518 1671 return PTR_ERR(table);
36dd1bcc 1672 }
96518518 1673
f102d66b 1674 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
36dd1bcc
PNA		 1675 if (IS_ERR(chain)) {
1676 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
96518518 1677 return PTR_ERR(chain);
36dd1bcc 1678 }
96518518 1679
d9adf22a 1680 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
96518518
PM		 1681 if (!skb2)
1682 return -ENOMEM;
1683
84d7fce6 1684 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
797d4980
PNA		 1685 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1686 0, family, table, chain);
96518518 1687 if (err < 0)
ee921183 1688 goto err_fill_chain_info;
96518518 1689
ee921183 1690 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
96518518 1691
ee921183 1692err_fill_chain_info:
96518518
PM		 1693 kfree_skb(skb2);
1694 return err;
1695}
1696
0ca743a5
PNA		 1697static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1698 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1699 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1700};
1701
ff3cd7b3 1702static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
0ca743a5
PNA		 1703{
1704 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1705 struct nft_stats __percpu *newstats;
1706 struct nft_stats *stats;
1707 int err;
1708
8cb08174
JB		 1709 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1710 nft_counter_policy, NULL);
0ca743a5 1711 if (err < 0)
ff3cd7b3 1712 return ERR_PTR(err);
0ca743a5
PNA		 1713
1714 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
ff3cd7b3 1715 return ERR_PTR(-EINVAL);
0ca743a5 1716
ce355e20 1717 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
0ca743a5 1718 if (newstats == NULL)
ff3cd7b3 1719 return ERR_PTR(-ENOMEM);
0ca743a5
PNA		 1720
1721 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1722 * are not exposed to userspace.
1723 */
e8781f70 1724 preempt_disable();
0ca743a5
PNA		 1725 stats = this_cpu_ptr(newstats);
1726 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1727 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
e8781f70 1728 preempt_enable();
0ca743a5 1729
ff3cd7b3
PNA		 1730 return newstats;
1731}
1732
53315ac6 1733static void nft_chain_stats_replace(struct nft_trans *trans)
ff3cd7b3 1734{
53315ac6 1735 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
0befd061 1736
53315ac6 1737 if (!nft_trans_chain_stats(trans))
b88825de
PNA		 1738 return;
1739
b685b534
PM		 1740 nft_trans_chain_stats(trans) =
1741 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1742 lockdep_commit_lock_is_held(trans->ctx.net));
53315ac6
FW		 1743
1744 if (!nft_trans_chain_stats(trans))
bbb8c61f 1745 static_branch_inc(&nft_counters_enabled);
0ca743a5
PNA		 1746}
1747
0cbc06b3
FW		 1748static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1749{
2c865a8a
PNA		 1750 struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
1751 struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
0cbc06b3
FW		 1752
1753 if (g0 != g1)
1754 kvfree(g1);
1755 kvfree(g0);
1756
1757 /* should be NULL either via abort or via successful commit */
2c865a8a
PNA		 1758 WARN_ON_ONCE(chain->blob_next);
1759 kvfree(chain->blob_next);
0cbc06b3
FW		 1760}
1761
d0e2c7de 1762void nf_tables_chain_destroy(struct nft_ctx *ctx)
91c7b38d 1763{
43a605f2 1764 struct nft_chain *chain = ctx->chain;
d54725cd 1765 struct nft_hook *hook, *next;
43a605f2 1766
fa5950e4
FW		 1767 if (WARN_ON(chain->use > 0))
1768 return;
91c7b38d 1769
0cbc06b3
FW		 1770 /* no concurrent access possible anymore */
1771 nf_tables_chain_free_chain_rules(chain);
1772
f323d954 1773 if (nft_is_base_chain(chain)) {
2cbce139
PNA		 1774 struct nft_base_chain *basechain = nft_base_chain(chain);
1775
d3519cb8 1776 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
d54725cd
PNA		 1777 list_for_each_entry_safe(hook, next,
1778 &basechain->hook_list, list) {
1779 list_del_rcu(&hook->list);
1780 kfree_rcu(hook, rcu);
1781 }
1782 }
2cbce139 1783 module_put(basechain->type->owner);
4c05ec47 1784 if (rcu_access_pointer(basechain->stats)) {
9f08ea84 1785 static_branch_dec(&nft_counters_enabled);
4c05ec47
TY		 1786 free_percpu(rcu_dereference_raw(basechain->stats));
1787 }
b7263e07 1788 kfree(chain->name);
002f2176 1789 kfree(chain->udata);
2cbce139 1790 kfree(basechain);
91c7b38d 1791 } else {
b7263e07 1792 kfree(chain->name);
002f2176 1793 kfree(chain->udata);
91c7b38d
PNA		 1794 kfree(chain);
1795 }
1796}
1797
3f0465a9
PNA		 1798static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1799 const struct nlattr *attr)
1800{
1801 struct net_device *dev;
1802 char ifname[IFNAMSIZ];
1803 struct nft_hook *hook;
1804 int err;
1805
1806 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1807 if (!hook) {
1808 err = -ENOMEM;
1809 goto err_hook_alloc;
1810 }
1811
872f6903 1812 nla_strscpy(ifname, attr, IFNAMSIZ);
42f1c271
PNA		 1813 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1814 * indirectly serializing all the other holders of the commit_mutex with
1815 * the rtnl_mutex.
1816 */
3f0465a9
PNA		 1817 dev = __dev_get_by_name(net, ifname);
1818 if (!dev) {
1819 err = -ENOENT;
1820 goto err_hook_dev;
1821 }
1822 hook->ops.dev = dev;
abadb2f8 1823 hook->inactive = false;
3f0465a9
PNA		 1824
1825 return hook;
1826
1827err_hook_dev:
1828 kfree(hook);
1829err_hook_alloc:
1830 return ERR_PTR(err);
1831}
1832
abadb2f8
PNA		 1833static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1834 const struct nft_hook *this)
b75a3e83
PNA		 1835{
1836 struct nft_hook *hook;
1837
1838 list_for_each_entry(hook, hook_list, list) {
1839 if (this->ops.dev == hook->ops.dev)
abadb2f8 1840 return hook;
b75a3e83
PNA		 1841 }
1842
abadb2f8 1843 return NULL;
b75a3e83
PNA		 1844}
1845
3f0465a9
PNA		 1846static int nf_tables_parse_netdev_hooks(struct net *net,
1847 const struct nlattr *attr,
1848 struct list_head *hook_list)
1849{
1850 struct nft_hook *hook, *next;
1851 const struct nlattr *tmp;
1852 int rem, n = 0, err;
1853
1854 nla_for_each_nested(tmp, attr, rem) {
1855 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1856 err = -EINVAL;
1857 goto err_hook;
1858 }
1859
1860 hook = nft_netdev_hook_alloc(net, tmp);
1861 if (IS_ERR(hook)) {
1862 err = PTR_ERR(hook);
1863 goto err_hook;
1864 }
b75a3e83 1865 if (nft_hook_list_find(hook_list, hook)) {
cd77e75b 1866 kfree(hook);
b75a3e83
PNA		 1867 err = -EEXIST;
1868 goto err_hook;
1869 }
3f0465a9
PNA		 1870 list_add_tail(&hook->list, hook_list);
1871 n++;
1872
cb662ac6 1873 if (n == NFT_NETDEVICE_MAX) {
3f0465a9
PNA		 1874 err = -EFBIG;
1875 goto err_hook;
1876 }
1877 }
3f0465a9
PNA		 1878
1879 return 0;
1880
1881err_hook:
1882 list_for_each_entry_safe(hook, next, hook_list, list) {
1883 list_del(&hook->list);
1884 kfree(hook);
1885 }
1886 return err;
1887}
1888
508f8ccd
PNA		 1889struct nft_chain_hook {
1890 u32 num;
84ba7dd7 1891 s32 priority;
32537e91 1892 const struct nft_chain_type *type;
d54725cd 1893 struct list_head list;
508f8ccd
PNA		 1894};
1895
d54725cd
PNA		 1896static int nft_chain_parse_netdev(struct net *net,
1897 struct nlattr *tb[],
1898 struct list_head *hook_list)
1899{
1900 struct nft_hook *hook;
1901 int err;
1902
1903 if (tb[NFTA_HOOK_DEV]) {
1904 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1905 if (IS_ERR(hook))
1906 return PTR_ERR(hook);
1907
1908 list_add_tail(&hook->list, hook_list);
1909 } else if (tb[NFTA_HOOK_DEVS]) {
1910 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1911 hook_list);
1912 if (err < 0)
1913 return err;
05abe445
PNA		 1914
1915 if (list_empty(hook_list))
1916 return -EINVAL;
d54725cd
PNA		 1917 } else {
1918 return -EINVAL;
1919 }
1920
1921 return 0;
1922}
1923
508f8ccd
PNA		 1924static int nft_chain_parse_hook(struct net *net,
1925 const struct nlattr * const nla[],
36596dad 1926 struct nft_chain_hook *hook, u8 family,
983c4fcb 1927 struct netlink_ext_ack *extack, bool autoload)
508f8ccd 1928{
d59d2f82 1929 struct nftables_pernet *nft_net = nft_pernet(net);
508f8ccd 1930 struct nlattr *ha[NFTA_HOOK_MAX + 1];
32537e91 1931 const struct nft_chain_type *type;
508f8ccd
PNA		 1932 int err;
1933
0854db2a 1934 lockdep_assert_held(&nft_net->commit_mutex);
f102d66b
FW		 1935 lockdep_nfnl_nft_mutex_not_held();
1936
8cb08174
JB		 1937 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1938 nla[NFTA_CHAIN_HOOK],
1939 nft_hook_policy, NULL);
508f8ccd
PNA		 1940 if (err < 0)
1941 return err;
1942
1943 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1944 ha[NFTA_HOOK_PRIORITY] == NULL)
1945 return -EINVAL;
1946
1947 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
508f8ccd
PNA		 1948 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1949
82603549
PNA		 1950 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1951 if (!type)
1952 return -EOPNOTSUPP;
1953
508f8ccd 1954 if (nla[NFTA_CHAIN_TYPE]) {
452238e8 1955 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
445509eb 1956 family, autoload);
983c4fcb
PNA		 1957 if (IS_ERR(type)) {
1958 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
508f8ccd 1959 return PTR_ERR(type);
983c4fcb 1960 }
508f8ccd 1961 }
d25e2e93 1962 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
508f8ccd 1963 return -EOPNOTSUPP;
84ba7dd7
FW		 1964
1965 if (type->type == NFT_CHAIN_T_NAT &&
1966 hook->priority <= NF_IP_PRI_CONNTRACK)
1967 return -EOPNOTSUPP;
1968
983c4fcb
PNA		 1969 if (!try_module_get(type->owner)) {
1970 if (nla[NFTA_CHAIN_TYPE])
1971 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
508f8ccd 1972 return -ENOENT;
983c4fcb 1973 }
508f8ccd
PNA		 1974
1975 hook->type = type;
1976
d54725cd 1977 INIT_LIST_HEAD(&hook->list);
d3519cb8 1978 if (nft_base_chain_netdev(family, hook->num)) {
d54725cd
PNA		 1979 err = nft_chain_parse_netdev(net, ha, &hook->list);
1980 if (err < 0) {
508f8ccd 1981 module_put(type->owner);
d54725cd 1982 return err;
508f8ccd 1983 }
d54725cd 1984 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
508f8ccd
PNA		 1985 module_put(type->owner);
1986 return -EOPNOTSUPP;
1987 }
1988
1989 return 0;
1990}
1991
1992static void nft_chain_release_hook(struct nft_chain_hook *hook)
1993{
d54725cd
PNA		 1994 struct nft_hook *h, *next;
1995
1996 list_for_each_entry_safe(h, next, &hook->list, list) {
1997 list_del(&h->list);
1998 kfree(h);
1999 }
508f8ccd 2000 module_put(hook->type->owner);
508f8ccd
PNA		 2001}
2002
0cbc06b3
FW		 2003struct nft_rules_old {
2004 struct rcu_head h;
2c865a8a 2005 struct nft_rule_blob *blob;
0cbc06b3
FW		 2006};
2007
2c865a8a 2008static void nft_last_rule(struct nft_rule_blob *blob, const void *ptr)
0cbc06b3 2009{
2c865a8a
PNA		 2010 struct nft_rule_dp *prule;
2011
2012 prule = (struct nft_rule_dp *)ptr;
2013 prule->is_last = 1;
2c865a8a
PNA		 2014 /* blob size does not include the trailer rule */
2015}
2016
2017static struct nft_rule_blob *nf_tables_chain_alloc_rules(unsigned int size)
2018{
2019 struct nft_rule_blob *blob;
2020
2021 /* size must include room for the last rule */
2022 if (size < offsetof(struct nft_rule_dp, data))
2023 return NULL;
2024
2025 size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rules_old);
2026 if (size > INT_MAX)
0cbc06b3
FW		 2027 return NULL;
2028
2c865a8a
PNA		 2029 blob = kvmalloc(size, GFP_KERNEL);
2030 if (!blob)
0cbc06b3
FW		 2031 return NULL;
2032
2c865a8a
PNA		 2033 blob->size = 0;
2034 nft_last_rule(blob, blob->data);
0cbc06b3 2035
2c865a8a 2036 return blob;
0cbc06b3
FW		 2037}
2038
d54725cd
PNA		 2039static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2040 const struct nft_chain_hook *hook,
2041 struct nft_chain *chain)
2042{
c5c6accd
FW		 2043 ops->pf = family;
2044 ops->hooknum = hook->num;
2045 ops->priority = hook->priority;
2046 ops->priv = chain;
2047 ops->hook = hook->type->hooks[ops->hooknum];
2048 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
d54725cd
PNA		 2049}
2050
2051static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2052 struct nft_chain_hook *hook, u32 flags)
2053{
2054 struct nft_chain *chain;
2055 struct nft_hook *h;
2056
2057 basechain->type = hook->type;
2058 INIT_LIST_HEAD(&basechain->hook_list);
2059 chain = &basechain->chain;
2060
d3519cb8 2061 if (nft_base_chain_netdev(family, hook->num)) {
d54725cd
PNA		 2062 list_splice_init(&hook->list, &basechain->hook_list);
2063 list_for_each_entry(h, &basechain->hook_list, list)
2064 nft_basechain_hook_init(&h->ops, family, hook, chain);
2065
2066 basechain->ops.hooknum = hook->num;
2067 basechain->ops.priority = hook->priority;
2068 } else {
2069 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2070 }
2071
67c49de4 2072 chain->flags |= NFT_CHAIN_BASE | flags;
d54725cd
PNA		 2073 basechain->policy = NF_ACCEPT;
2074 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2075 nft_chain_offload_priority(basechain) < 0)
2076 return -EOPNOTSUPP;
2077
2078 flow_block_init(&basechain->flow_block);
2079
2080 return 0;
2081}
2082
04b7db41
PNA		 2083static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2084{
2085 int err;
2086
2087 err = rhltable_insert_key(&table->chains_ht, chain->name,
2088 &chain->rhlhead, nft_chain_ht_params);
2089 if (err)
2090 return err;
2091
2092 list_add_tail_rcu(&chain->list, &table->chains);
2093
2094 return 0;
2095}
2096
d0e2c7de
PNA		 2097static u64 chain_id;
2098
4035285f 2099static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
983c4fcb
PNA		 2100 u8 policy, u32 flags,
2101 struct netlink_ext_ack *extack)
4035285f
PNA		 2102{
2103 const struct nlattr * const *nla = ctx->nla;
2104 struct nft_table *table = ctx->table;
4035285f
PNA		 2105 struct nft_base_chain *basechain;
2106 struct nft_stats __percpu *stats;
2107 struct net *net = ctx->net;
d0e2c7de 2108 char name[NFT_NAME_MAXLEN];
2c865a8a 2109 struct nft_rule_blob *blob;
66293c46 2110 struct nft_trans *trans;
4035285f 2111 struct nft_chain *chain;
2c865a8a 2112 unsigned int data_size;
4035285f
PNA		 2113 int err;
2114
2115 if (table->use == UINT_MAX)
2116 return -EOVERFLOW;
2117
2118 if (nla[NFTA_CHAIN_HOOK]) {
2119 struct nft_chain_hook hook;
4035285f 2120
d0e2c7de
PNA		 2121 if (flags & NFT_CHAIN_BINDING)
2122 return -EOPNOTSUPP;
2123
983c4fcb
PNA		 2124 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2125 true);
4035285f
PNA		 2126 if (err < 0)
2127 return err;
2128
2129 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
2130 if (basechain == NULL) {
2131 nft_chain_release_hook(&hook);
2132 return -ENOMEM;
2133 }
d54725cd 2134 chain = &basechain->chain;
4035285f
PNA		 2135
2136 if (nla[NFTA_CHAIN_COUNTERS]) {
2137 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2138 if (IS_ERR(stats)) {
2139 nft_chain_release_hook(&hook);
2140 kfree(basechain);
2141 return PTR_ERR(stats);
2142 }
4c05ec47 2143 rcu_assign_pointer(basechain->stats, stats);
4035285f
PNA		 2144 static_branch_inc(&nft_counters_enabled);
2145 }
2146
d54725cd
PNA		 2147 err = nft_basechain_init(basechain, family, &hook, flags);
2148 if (err < 0) {
2149 nft_chain_release_hook(&hook);
2150 kfree(basechain);
2151 return err;
2152 }
4035285f 2153 } else {
d0e2c7de
PNA		 2154 if (flags & NFT_CHAIN_BASE)
2155 return -EINVAL;
2156 if (flags & NFT_CHAIN_HW_OFFLOAD)
2157 return -EOPNOTSUPP;
2158
4035285f
PNA		 2159 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2160 if (chain == NULL)
2161 return -ENOMEM;
d0e2c7de
PNA		 2162
2163 chain->flags = flags;
4035285f 2164 }
43a605f2
PNA		 2165 ctx->chain = chain;
2166
4035285f
PNA		 2167 INIT_LIST_HEAD(&chain->rules);
2168 chain->handle = nf_tables_alloc_handle(table);
2169 chain->table = table;
d0e2c7de
PNA		 2170
2171 if (nla[NFTA_CHAIN_NAME]) {
2172 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2173 } else {
59136aa3
FW		 2174 if (!(flags & NFT_CHAIN_BINDING)) {
2175 err = -EINVAL;
002f2176 2176 goto err_destroy_chain;
59136aa3 2177 }
d0e2c7de
PNA		 2178
2179 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2180 chain->name = kstrdup(name, GFP_KERNEL);
2181 }
2182
4035285f
PNA		 2183 if (!chain->name) {
2184 err = -ENOMEM;
002f2176
JGG		 2185 goto err_destroy_chain;
2186 }
2187
2188 if (nla[NFTA_CHAIN_USERDATA]) {
2189 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL);
2190 if (chain->udata == NULL) {
2191 err = -ENOMEM;
2192 goto err_destroy_chain;
2193 }
2194 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
4035285f
PNA		 2195 }
2196
2c865a8a
PNA		 2197 data_size = offsetof(struct nft_rule_dp, data); /* last rule */
2198 blob = nf_tables_chain_alloc_rules(data_size);
2199 if (!blob) {
0cbc06b3 2200 err = -ENOMEM;
002f2176 2201 goto err_destroy_chain;
0cbc06b3
FW		 2202 }
2203
2c865a8a
PNA		 2204 RCU_INIT_POINTER(chain->blob_gen_0, blob);
2205 RCU_INIT_POINTER(chain->blob_gen_1, blob);
0cbc06b3 2206
c974a3a3 2207 err = nf_tables_register_hook(net, table, chain);
4035285f 2208 if (err < 0)
002f2176 2209 goto err_destroy_chain;
4035285f 2210
66293c46
FW		 2211 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2212 if (IS_ERR(trans)) {
2213 err = PTR_ERR(trans);
002f2176 2214 goto err_unregister_hook;
1b2470e5 2215 }
4035285f 2216
ad652f38 2217 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
66293c46
FW		 2218 if (nft_is_base_chain(chain))
2219 nft_trans_chain_policy(trans) = policy;
2220
04b7db41
PNA		 2221 err = nft_chain_add(table, chain);
2222 if (err < 0) {
2223 nft_trans_destroy(trans);
002f2176 2224 goto err_unregister_hook;
04b7db41
PNA		 2225 }
2226
4035285f 2227 table->use++;
4035285f
PNA		 2228
2229 return 0;
002f2176 2230err_unregister_hook:
c974a3a3 2231 nf_tables_unregister_hook(net, table, chain);
002f2176 2232err_destroy_chain:
43a605f2 2233 nf_tables_chain_destroy(ctx);
4035285f
PNA		 2234
2235 return err;
2236}
2237
d54725cd
PNA		 2238static bool nft_hook_list_equal(struct list_head *hook_list1,
2239 struct list_head *hook_list2)
2240{
2241 struct nft_hook *hook;
2242 int n = 0, m = 0;
2243
2244 n = 0;
2245 list_for_each_entry(hook, hook_list2, list) {
2246 if (!nft_hook_list_find(hook_list1, hook))
2247 return false;
2248
2249 n++;
2250 }
2251 list_for_each_entry(hook, hook_list1, list)
2252 m++;
2253
2254 return n == m;
2255}
2256
c9626a2c 2257static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
98a381a7
PNA		 2258 u32 flags, const struct nlattr *attr,
2259 struct netlink_ext_ack *extack)
2c4a488a
PNA		 2260{
2261 const struct nlattr * const *nla = ctx->nla;
2262 struct nft_table *table = ctx->table;
2263 struct nft_chain *chain = ctx->chain;
2c4a488a
PNA		 2264 struct nft_base_chain *basechain;
2265 struct nft_stats *stats = NULL;
2266 struct nft_chain_hook hook;
2c4a488a
PNA		 2267 struct nf_hook_ops *ops;
2268 struct nft_trans *trans;
c974a3a3 2269 int err;
2c4a488a 2270
c9626a2c
PNA		 2271 if (chain->flags ^ flags)
2272 return -EOPNOTSUPP;
2273
2c4a488a 2274 if (nla[NFTA_CHAIN_HOOK]) {
98a381a7
PNA		 2275 if (!nft_is_base_chain(chain)) {
2276 NL_SET_BAD_ATTR(extack, attr);
77a92189 2277 return -EEXIST;
98a381a7 2278 }
36596dad 2279 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
983c4fcb 2280 extack, false);
2c4a488a
PNA		 2281 if (err < 0)
2282 return err;
2283
2284 basechain = nft_base_chain(chain);
2285 if (basechain->type != hook.type) {
2286 nft_chain_release_hook(&hook);
98a381a7 2287 NL_SET_BAD_ATTR(extack, attr);
77a92189 2288 return -EEXIST;
2c4a488a
PNA		 2289 }
2290
d3519cb8 2291 if (nft_base_chain_netdev(ctx->family, hook.num)) {
d54725cd
PNA		 2292 if (!nft_hook_list_equal(&basechain->hook_list,
2293 &hook.list)) {
2294 nft_chain_release_hook(&hook);
98a381a7 2295 NL_SET_BAD_ATTR(extack, attr);
77a92189 2296 return -EEXIST;
d54725cd
PNA		 2297 }
2298 } else {
2299 ops = &basechain->ops;
2300 if (ops->hooknum != hook.num ||
2301 ops->priority != hook.priority) {
2302 nft_chain_release_hook(&hook);
98a381a7 2303 NL_SET_BAD_ATTR(extack, attr);
77a92189 2304 return -EEXIST;
d54725cd 2305 }
2c4a488a
PNA		 2306 }
2307 nft_chain_release_hook(&hook);
2308 }
2309
2310 if (nla[NFTA_CHAIN_HANDLE] &&
2311 nla[NFTA_CHAIN_NAME]) {
2312 struct nft_chain *chain2;
2313
f102d66b
FW		 2314 chain2 = nft_chain_lookup(ctx->net, table,
2315 nla[NFTA_CHAIN_NAME], genmask);
98a381a7
PNA		 2316 if (!IS_ERR(chain2)) {
2317 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
0d18779b 2318 return -EEXIST;
98a381a7 2319 }
2c4a488a
PNA		 2320 }
2321
2322 if (nla[NFTA_CHAIN_COUNTERS]) {
2323 if (!nft_is_base_chain(chain))
2324 return -EOPNOTSUPP;
2325
2326 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2327 if (IS_ERR(stats))
2328 return PTR_ERR(stats);
2329 }
2330
c6cc94df 2331 err = -ENOMEM;
2c4a488a
PNA		 2332 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2333 sizeof(struct nft_trans_chain));
c6cc94df
FW		 2334 if (trans == NULL)
2335 goto err;
2c4a488a
PNA		 2336
2337 nft_trans_chain_stats(trans) = stats;
2338 nft_trans_chain_update(trans) = true;
2339
2340 if (nla[NFTA_CHAIN_POLICY])
2341 nft_trans_chain_policy(trans) = policy;
2342 else
2343 nft_trans_chain_policy(trans) = -1;
2344
c6cc94df
FW		 2345 if (nla[NFTA_CHAIN_HANDLE] &&
2346 nla[NFTA_CHAIN_NAME]) {
d59d2f82 2347 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
c6cc94df
FW		 2348 struct nft_trans *tmp;
2349 char *name;
2350
2351 err = -ENOMEM;
2352 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2353 if (!name)
2354 goto err;
2355
2356 err = -EEXIST;
0854db2a 2357 list_for_each_entry(tmp, &nft_net->commit_list, list) {
c6cc94df
FW		 2358 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2359 tmp->ctx.table == table &&
2360 nft_trans_chain_update(tmp) &&
2361 nft_trans_chain_name(tmp) &&
2362 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
98a381a7 2363 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
c6cc94df
FW		 2364 kfree(name);
2365 goto err;
2366 }
2c4a488a 2367 }
c6cc94df
FW		 2368
2369 nft_trans_chain_name(trans) = name;
2c4a488a 2370 }
0854db2a 2371 nft_trans_commit_list_add_tail(ctx->net, trans);
2c4a488a
PNA		 2372
2373 return 0;
c6cc94df
FW		 2374err:
2375 free_percpu(stats);
2376 kfree(trans);
2377 return err;
2c4a488a
PNA		 2378}
2379
837830a4
PNA		 2380static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2381 const struct nlattr *nla)
2382{
d59d2f82 2383 struct nftables_pernet *nft_net = nft_pernet(net);
837830a4
PNA		 2384 u32 id = ntohl(nla_get_be32(nla));
2385 struct nft_trans *trans;
2386
0854db2a 2387 list_for_each_entry(trans, &nft_net->commit_list, list) {
837830a4
PNA		 2388 struct nft_chain *chain = trans->ctx.chain;
2389
2390 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2391 id == nft_trans_chain_id(trans))
2392 return chain;
2393 }
2394 return ERR_PTR(-ENOENT);
2395}
2396
7dab8ee3
PNA		 2397static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2398 const struct nlattr * const nla[])
96518518 2399{
7dab8ee3 2400 struct nftables_pernet *nft_net = nft_pernet(info->net);
7dab8ee3
PNA		 2401 struct netlink_ext_ack *extack = info->extack;
2402 u8 genmask = nft_genmask_next(info->net);
ef4b65e5 2403 u8 family = info->nfmsg->nfgen_family;
74cccc3d 2404 struct nft_chain *chain = NULL;
7dab8ee3 2405 struct net *net = info->net;
36dd1bcc 2406 const struct nlattr *attr;
96518518 2407 struct nft_table *table;
57de2a0c 2408 u8 policy = NF_ACCEPT;
4035285f 2409 struct nft_ctx ctx;
96518518 2410 u64 handle = 0;
c9626a2c 2411 u32 flags = 0;
96518518 2412
0854db2a 2413 lockdep_assert_held(&nft_net->commit_mutex);
f102d66b 2414
6001a930
PNA		 2415 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2416 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 2417 if (IS_ERR(table)) {
2418 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
96518518 2419 return PTR_ERR(table);
36dd1bcc 2420 }
96518518 2421
96518518 2422 chain = NULL;
36dd1bcc 2423 attr = nla[NFTA_CHAIN_NAME];
96518518
PM		 2424
2425 if (nla[NFTA_CHAIN_HANDLE]) {
2426 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
cac20fcd 2427 chain = nft_chain_lookup_byhandle(table, handle, genmask);
36dd1bcc
PNA		 2428 if (IS_ERR(chain)) {
2429 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
96518518 2430 return PTR_ERR(chain);
36dd1bcc
PNA		 2431 }
2432 attr = nla[NFTA_CHAIN_HANDLE];
74cccc3d 2433 } else if (nla[NFTA_CHAIN_NAME]) {
f102d66b 2434 chain = nft_chain_lookup(net, table, attr, genmask);
96518518 2435 if (IS_ERR(chain)) {
36dd1bcc
PNA		 2436 if (PTR_ERR(chain) != -ENOENT) {
2437 NL_SET_BAD_ATTR(extack, attr);
96518518 2438 return PTR_ERR(chain);
36dd1bcc 2439 }
96518518
PM		 2440 chain = NULL;
2441 }
74cccc3d
PNA		 2442 } else if (!nla[NFTA_CHAIN_ID]) {
2443 return -EINVAL;
96518518
PM		 2444 }
2445
57de2a0c 2446 if (nla[NFTA_CHAIN_POLICY]) {
f323d954 2447 if (chain != NULL &&
36dd1bcc
PNA		 2448 !nft_is_base_chain(chain)) {
2449 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
d6b6cb1d 2450 return -EOPNOTSUPP;
36dd1bcc 2451 }
d6b6cb1d
PNA		 2452
2453 if (chain == NULL &&
36dd1bcc
PNA		 2454 nla[NFTA_CHAIN_HOOK] == NULL) {
2455 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
57de2a0c 2456 return -EOPNOTSUPP;
36dd1bcc 2457 }
57de2a0c 2458
8f46df18 2459 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
57de2a0c
PM		 2460 switch (policy) {
2461 case NF_DROP:
2462 case NF_ACCEPT:
2463 break;
2464 default:
2465 return -EINVAL;
2466 }
2467 }
2468
c9626a2c
PNA		 2469 if (nla[NFTA_CHAIN_FLAGS])
2470 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
b717273d
FW		 2471 else if (chain)
2472 flags = chain->flags;
c9626a2c 2473
c1f79a2e
PNA		 2474 if (flags & ~NFT_CHAIN_FLAGS)
2475 return -EOPNOTSUPP;
2476
7dab8ee3 2477 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4035285f 2478
96518518 2479 if (chain != NULL) {
7dab8ee3 2480 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
36dd1bcc 2481 NL_SET_BAD_ATTR(extack, attr);
96518518 2482 return -EEXIST;
36dd1bcc 2483 }
7dab8ee3 2484 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
96518518
PM		 2485 return -EOPNOTSUPP;
2486
67c49de4 2487 flags |= chain->flags & NFT_CHAIN_BASE;
98a381a7
PNA		 2488 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2489 extack);
96518518
PM		 2490 }
2491
983c4fcb 2492 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
96518518
PM		 2493}
2494
7dab8ee3
PNA		 2495static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2496 const struct nlattr * const nla[])
96518518 2497{
7dab8ee3
PNA		 2498 struct netlink_ext_ack *extack = info->extack;
2499 u8 genmask = nft_genmask_next(info->net);
ef4b65e5 2500 u8 family = info->nfmsg->nfgen_family;
7dab8ee3 2501 struct net *net = info->net;
36dd1bcc 2502 const struct nlattr *attr;
96518518
PM		 2503 struct nft_table *table;
2504 struct nft_chain *chain;
9dee1474 2505 struct nft_rule *rule;
91c7b38d 2506 struct nft_ctx ctx;
3ecbfd65 2507 u64 handle;
9dee1474
PNA		 2508 u32 use;
2509 int err;
96518518 2510
6001a930
PNA		 2511 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2512 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 2513 if (IS_ERR(table)) {
2514 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
96518518 2515 return PTR_ERR(table);
36dd1bcc 2516 }
96518518 2517
3ecbfd65 2518 if (nla[NFTA_CHAIN_HANDLE]) {
36dd1bcc
PNA		 2519 attr = nla[NFTA_CHAIN_HANDLE];
2520 handle = be64_to_cpu(nla_get_be64(attr));
cac20fcd 2521 chain = nft_chain_lookup_byhandle(table, handle, genmask);
3ecbfd65 2522 } else {
36dd1bcc 2523 attr = nla[NFTA_CHAIN_NAME];
f102d66b 2524 chain = nft_chain_lookup(net, table, attr, genmask);
3ecbfd65 2525 }
36dd1bcc
PNA		 2526 if (IS_ERR(chain)) {
2527 NL_SET_BAD_ATTR(extack, attr);
96518518 2528 return PTR_ERR(chain);
36dd1bcc 2529 }
9dee1474 2530
7dab8ee3 2531 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
9dee1474 2532 chain->use > 0)
96518518
PM		 2533 return -EBUSY;
2534
7dab8ee3 2535 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
0165d932 2536
9dee1474
PNA		 2537 use = chain->use;
2538 list_for_each_entry(rule, &chain->rules, list) {
2539 if (!nft_is_active_next(net, rule))
2540 continue;
2541 use--;
2542
2543 err = nft_delrule(&ctx, rule);
2544 if (err < 0)
2545 return err;
2546 }
2547
2548 /* There are rules and elements that are still holding references to us,
2549 * we cannot do a recursive removal in this case.
2550 */
36dd1bcc
PNA		 2551 if (use > 0) {
2552 NL_SET_BAD_ATTR(extack, attr);
9dee1474 2553 return -EBUSY;
36dd1bcc 2554 }
9dee1474 2555
ee01d542 2556 return nft_delchain(&ctx);
96518518
PM		 2557}
2558
96518518
PM		 2559/*
2560 * Expressions
2561 */
2562
2563/**
ef1f7df9 2564 * nft_register_expr - register nf_tables expr type
3db86c39 2565 * @type: expr type
96518518 2566 *
ef1f7df9 2567 * Registers the expr type for use with nf_tables. Returns zero on
96518518
PM		 2568 * success or a negative errno code otherwise.
2569 */
ef1f7df9 2570int nft_register_expr(struct nft_expr_type *type)
96518518
PM		 2571{
2572 nfnl_lock(NFNL_SUBSYS_NFTABLES);
758dbcec 2573 if (type->family == NFPROTO_UNSPEC)
e688a7f8 2574 list_add_tail_rcu(&type->list, &nf_tables_expressions);
758dbcec 2575 else
e688a7f8 2576 list_add_rcu(&type->list, &nf_tables_expressions);
96518518
PM		 2577 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2578 return 0;
2579}
2580EXPORT_SYMBOL_GPL(nft_register_expr);
2581
2582/**
ef1f7df9 2583 * nft_unregister_expr - unregister nf_tables expr type
3db86c39 2584 * @type: expr type
96518518 2585 *
ef1f7df9 2586 * Unregisters the expr typefor use with nf_tables.
96518518 2587 */
ef1f7df9 2588void nft_unregister_expr(struct nft_expr_type *type)
96518518
PM		 2589{
2590 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2591 list_del_rcu(&type->list);
96518518
PM		 2592 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2593}
2594EXPORT_SYMBOL_GPL(nft_unregister_expr);
2595
64d46806
PM		 2596static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2597 struct nlattr *nla)
96518518 2598{
9cff126f 2599 const struct nft_expr_type *type, *candidate = NULL;
96518518 2600
ef1f7df9 2601 list_for_each_entry(type, &nf_tables_expressions, list) {
9cff126f
PNA		 2602 if (!nla_strcmp(nla, type->name)) {
2603 if (!type->family && !candidate)
2604 candidate = type;
2605 else if (type->family == family)
2606 candidate = type;
2607 }
96518518 2608 }
9cff126f 2609 return candidate;
96518518
PM		 2610}
2611
b9c04ae7
PNA		 2612#ifdef CONFIG_MODULES
2613static int nft_expr_type_request_module(struct net *net, u8 family,
2614 struct nlattr *nla)
2615{
eb014de4
PNA		 2616 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2617 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
b9c04ae7
PNA		 2618 return -EAGAIN;
2619
2620 return 0;
2621}
2622#endif
2623
452238e8
FW		 2624static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2625 u8 family,
64d46806 2626 struct nlattr *nla)
96518518 2627{
ef1f7df9 2628 const struct nft_expr_type *type;
96518518
PM		 2629
2630 if (nla == NULL)
2631 return ERR_PTR(-EINVAL);
2632
64d46806 2633 type = __nft_expr_type_get(family, nla);
ef1f7df9
PM		 2634 if (type != NULL && try_module_get(type->owner))
2635 return type;
96518518 2636
f102d66b 2637 lockdep_nfnl_nft_mutex_not_held();
96518518 2638#ifdef CONFIG_MODULES
ef1f7df9 2639 if (type == NULL) {
b9c04ae7 2640 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
64d46806
PM		 2641 return ERR_PTR(-EAGAIN);
2642
eb014de4
PNA		 2643 if (nft_request_module(net, "nft-expr-%.*s",
2644 nla_len(nla),
2645 (char *)nla_data(nla)) == -EAGAIN)
96518518
PM		 2646 return ERR_PTR(-EAGAIN);
2647 }
2648#endif
2649 return ERR_PTR(-ENOENT);
2650}
2651
2652static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
9332d27d
FW		 2653 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2654 .len = NFT_MODULE_AUTOLOAD_LIMIT },
96518518
PM		 2655 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2656};
2657
2658static int nf_tables_fill_expr_info(struct sk_buff *skb,
2659 const struct nft_expr *expr)
2660{
ef1f7df9 2661 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
96518518
PM		 2662 goto nla_put_failure;
2663
2664 if (expr->ops->dump) {
ae0be8de
MK		 2665 struct nlattr *data = nla_nest_start_noflag(skb,
2666 NFTA_EXPR_DATA);
96518518
PM		 2667 if (data == NULL)
2668 goto nla_put_failure;
2669 if (expr->ops->dump(skb, expr) < 0)
2670 goto nla_put_failure;
2671 nla_nest_end(skb, data);
2672 }
2673
2674 return skb->len;
2675
2676nla_put_failure:
2677 return -1;
2678};
2679
0b2d8a7b
PM		 2680int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2681 const struct nft_expr *expr)
2682{
2683 struct nlattr *nest;
2684
ae0be8de 2685 nest = nla_nest_start_noflag(skb, attr);
0b2d8a7b
PM		 2686 if (!nest)
2687 goto nla_put_failure;
2688 if (nf_tables_fill_expr_info(skb, expr) < 0)
2689 goto nla_put_failure;
2690 nla_nest_end(skb, nest);
2691 return 0;
2692
2693nla_put_failure:
2694 return -1;
2695}
2696
96518518
PM		 2697struct nft_expr_info {
2698 const struct nft_expr_ops *ops;
83d9dcba 2699 const struct nlattr *attr;
ef1f7df9 2700 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
96518518
PM		 2701};
2702
0ca743a5
PNA		 2703static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2704 const struct nlattr *nla,
96518518
PM		 2705 struct nft_expr_info *info)
2706{
ef1f7df9 2707 const struct nft_expr_type *type;
96518518 2708 const struct nft_expr_ops *ops;
ef1f7df9 2709 struct nlattr *tb[NFTA_EXPR_MAX + 1];
96518518
PM		 2710 int err;
2711
8cb08174
JB		 2712 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2713 nft_expr_policy, NULL);
96518518
PM		 2714 if (err < 0)
2715 return err;
2716
452238e8 2717 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
ef1f7df9
PM		 2718 if (IS_ERR(type))
2719 return PTR_ERR(type);
2720
2721 if (tb[NFTA_EXPR_DATA]) {
8cb08174
JB		 2722 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2723 tb[NFTA_EXPR_DATA],
2724 type->policy, NULL);
ef1f7df9
PM		 2725 if (err < 0)
2726 goto err1;
2727 } else
2728 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2729
2730 if (type->select_ops != NULL) {
0ca743a5
PNA		 2731 ops = type->select_ops(ctx,
2732 (const struct nlattr * const *)info->tb);
ef1f7df9
PM		 2733 if (IS_ERR(ops)) {
2734 err = PTR_ERR(ops);
0ef1efd1
PNA		 2735#ifdef CONFIG_MODULES
2736 if (err == -EAGAIN)
eb014de4
PNA		 2737 if (nft_expr_type_request_module(ctx->net,
2738 ctx->family,
2739 tb[NFTA_EXPR_NAME]) != -EAGAIN)
2740 err = -ENOENT;
0ef1efd1 2741#endif
ef1f7df9
PM		 2742 goto err1;
2743 }
2744 } else
2745 ops = type->ops;
2746
83d9dcba 2747 info->attr = nla;
96518518 2748 info->ops = ops;
83d9dcba 2749
96518518 2750 return 0;
ef1f7df9
PM		 2751
2752err1:
2753 module_put(type->owner);
2754 return err;
96518518
PM		 2755}
2756
2757static int nf_tables_newexpr(const struct nft_ctx *ctx,
7dab8ee3 2758 const struct nft_expr_info *expr_info,
96518518
PM		 2759 struct nft_expr *expr)
2760{
7dab8ee3 2761 const struct nft_expr_ops *ops = expr_info->ops;
96518518
PM		 2762 int err;
2763
2764 expr->ops = ops;
2765 if (ops->init) {
7dab8ee3 2766 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
96518518
PM		 2767 if (err < 0)
2768 goto err1;
2769 }
2770
96518518 2771 return 0;
96518518
PM		 2772err1:
2773 expr->ops = NULL;
2774 return err;
2775}
2776
62472bce
PM		 2777static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2778 struct nft_expr *expr)
96518518 2779{
3f3a390d
PNA		 2780 const struct nft_expr_type *type = expr->ops->type;
2781
96518518 2782 if (expr->ops->destroy)
62472bce 2783 expr->ops->destroy(ctx, expr);
3f3a390d 2784 module_put(type->owner);
96518518
PM		 2785}
2786
795a6d6b
PNA		 2787static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2788 const struct nlattr *nla)
0b2d8a7b 2789{
7dab8ee3 2790 struct nft_expr_info expr_info;
0b2d8a7b 2791 struct nft_expr *expr;
b8e20400 2792 struct module *owner;
0b2d8a7b
PM		 2793 int err;
2794
7dab8ee3 2795 err = nf_tables_expr_parse(ctx, nla, &expr_info);
0b2d8a7b
PM		 2796 if (err < 0)
2797 goto err1;
2798
2799 err = -ENOMEM;
7dab8ee3 2800 expr = kzalloc(expr_info.ops->size, GFP_KERNEL);
0b2d8a7b
PM		 2801 if (expr == NULL)
2802 goto err2;
2803
7dab8ee3 2804 err = nf_tables_newexpr(ctx, &expr_info, expr);
0b2d8a7b 2805 if (err < 0)
6cafaf47 2806 goto err3;
0b2d8a7b
PM		 2807
2808 return expr;
6cafaf47
LZ		 2809err3:
2810 kfree(expr);
0b2d8a7b 2811err2:
7dab8ee3
PNA		 2812 owner = expr_info.ops->type->owner;
2813 if (expr_info.ops->type->release_ops)
2814 expr_info.ops->type->release_ops(expr_info.ops);
b8e20400
PNA		 2815
2816 module_put(owner);
0b2d8a7b
PM		 2817err1:
2818 return ERR_PTR(err);
2819}
2820
c604cc69
PNA		 2821int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2822{
2823 int err;
2824
2825 if (src->ops->clone) {
2826 dst->ops = src->ops;
2827 err = src->ops->clone(dst, src);
2828 if (err < 0)
2829 return err;
2830 } else {
2831 memcpy(dst, src, src->ops->size);
2832 }
2833
2834 __module_get(src->ops->type->owner);
2835
2836 return 0;
2837}
2838
0b2d8a7b
PM		 2839void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2840{
2841 nf_tables_expr_destroy(ctx, expr);
2842 kfree(expr);
2843}
2844
96518518
PM		 2845/*
2846 * Rules
2847 */
2848
cac20fcd
PNA		 2849static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2850 u64 handle)
96518518
PM		 2851{
2852 struct nft_rule *rule;
2853
2854 // FIXME: this sucks
d9adf22a 2855 list_for_each_entry_rcu(rule, &chain->rules, list) {
96518518
PM		 2856 if (handle == rule->handle)
2857 return rule;
2858 }
2859
2860 return ERR_PTR(-ENOENT);
2861}
2862
cac20fcd
PNA		 2863static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2864 const struct nlattr *nla)
96518518
PM		 2865{
2866 if (nla == NULL)
2867 return ERR_PTR(-EINVAL);
2868
cac20fcd 2869 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
96518518
PM		 2870}
2871
2872static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
b2fbd044
LZ		 2873 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2874 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 2875 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2876 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2877 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2878 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
0ca743a5 2879 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
5e948466 2880 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
0768b3b3
PNA		 2881 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2882 .len = NFT_USERDATA_MAXLEN },
467697d2 2883 [NFTA_RULE_ID] = { .type = NLA_U32 },
0604628b 2884 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
837830a4 2885 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
96518518
PM		 2886};
2887
84d7fce6
PNA		 2888static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2889 u32 portid, u32 seq, int event,
2890 u32 flags, int family,
96518518
PM		 2891 const struct nft_table *table,
2892 const struct nft_chain *chain,
e189ae16 2893 const struct nft_rule *rule, u64 handle)
96518518
PM		 2894{
2895 struct nlmsghdr *nlh;
96518518
PM		 2896 const struct nft_expr *expr, *next;
2897 struct nlattr *list;
dedb67c4 2898 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518 2899
19c28b13
PNA		 2900 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
2901 nft_base_seq(net));
2902 if (!nlh)
96518518
PM		 2903 goto nla_put_failure;
2904
96518518
PM		 2905 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2906 goto nla_put_failure;
2907 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2908 goto nla_put_failure;
b46f6ded
ND		 2909 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2910 NFTA_RULE_PAD))
96518518
PM		 2911 goto nla_put_failure;
2912
e189ae16
PNA		 2913 if (event != NFT_MSG_DELRULE && handle) {
2914 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
b46f6ded 2915 NFTA_RULE_PAD))
5e948466
EL		 2916 goto nla_put_failure;
2917 }
2918
b72920f6
PNA		 2919 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2920 nft_flow_rule_stats(chain, rule);
2921
ae0be8de 2922 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
96518518
PM		 2923 if (list == NULL)
2924 goto nla_put_failure;
2925 nft_rule_for_each_expr(expr, next, rule) {
0b2d8a7b 2926 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
96518518 2927 goto nla_put_failure;
96518518
PM		 2928 }
2929 nla_nest_end(skb, list);
2930
86f1ec32
PM		 2931 if (rule->udata) {
2932 struct nft_userdata *udata = nft_userdata(rule);
2933 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2934 udata->data) < 0)
2935 goto nla_put_failure;
2936 }
0768b3b3 2937
053c095a
JB		 2938 nlmsg_end(skb, nlh);
2939 return 0;
96518518
PM		 2940
2941nla_put_failure:
2942 nlmsg_trim(skb, nlh);
2943 return -1;
2944}
2945
25e94a99
PNA		 2946static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2947 const struct nft_rule *rule, int event)
96518518 2948{
d59d2f82 2949 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
e189ae16 2950 const struct nft_rule *prule;
96518518 2951 struct sk_buff *skb;
e189ae16
PNA		 2952 u64 handle = 0;
2953 u16 flags = 0;
96518518
PM		 2954 int err;
2955
128ad332
PNA		 2956 if (!ctx->report &&
2957 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 2958 return;
96518518 2959
96518518
PM		 2960 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2961 if (skb == NULL)
2962 goto err;
2963
e189ae16
PNA		 2964 if (event == NFT_MSG_NEWRULE &&
2965 !list_is_first(&rule->list, &ctx->chain->rules) &&
2966 !list_is_last(&rule->list, &ctx->chain->rules)) {
2967 prule = list_prev_entry(rule, list);
2968 handle = prule->handle;
2969 }
2970 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
2971 flags |= NLM_F_APPEND;
6fb721cf
PNA		 2972 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
2973 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
e189ae16 2974
84d7fce6 2975 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
e189ae16
PNA		 2976 event, flags, ctx->family, ctx->table,
2977 ctx->chain, rule, handle);
96518518
PM		 2978 if (err < 0) {
2979 kfree_skb(skb);
2980 goto err;
2981 }
2982
0854db2a 2983 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
25e94a99 2984 return;
96518518 2985err:
25e94a99 2986 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 2987}
2988
6e1f760e 2989struct nft_rule_dump_ctx {
e46abbcc 2990 char *table;
b7263e07 2991 char *chain;
6e1f760e
PNA		 2992};
2993
241faece
PS		 2994static int __nf_tables_dump_rules(struct sk_buff *skb,
2995 unsigned int *idx,
2996 struct netlink_callback *cb,
2997 const struct nft_table *table,
2998 const struct nft_chain *chain)
2999{
3000 struct net *net = sock_net(skb->sk);
2c82c7e7 3001 const struct nft_rule *rule, *prule;
241faece 3002 unsigned int s_idx = cb->args[0];
e189ae16 3003 u64 handle;
241faece 3004
2c82c7e7 3005 prule = NULL;
241faece
PS		 3006 list_for_each_entry_rcu(rule, &chain->rules, list) {
3007 if (!nft_is_active(net, rule))
2c82c7e7 3008 goto cont_skip;
241faece
PS		 3009 if (*idx < s_idx)
3010 goto cont;
3011 if (*idx > s_idx) {
3012 memset(&cb->args[1], 0,
3013 sizeof(cb->args) - sizeof(cb->args[0]));
3014 }
e189ae16
PNA		 3015 if (prule)
3016 handle = prule->handle;
3017 else
3018 handle = 0;
3019
241faece
PS		 3020 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3021 cb->nlh->nlmsg_seq,
3022 NFT_MSG_NEWRULE,
3023 NLM_F_MULTI | NLM_F_APPEND,
3024 table->family,
e189ae16 3025 table, chain, rule, handle) < 0)
310529e6 3026 return 1;
241faece
PS		 3027
3028 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3029cont:
2c82c7e7
FW		 3030 prule = rule;
3031cont_skip:
241faece
PS		 3032 (*idx)++;
3033 }
310529e6 3034 return 0;
241faece
PS		 3035}
3036
96518518
PM		 3037static int nf_tables_dump_rules(struct sk_buff *skb,
3038 struct netlink_callback *cb)
3039{
3040 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6e1f760e 3041 const struct nft_rule_dump_ctx *ctx = cb->data;
241faece 3042 struct nft_table *table;
96518518 3043 const struct nft_chain *chain;
241faece 3044 unsigned int idx = 0;
99633ab2 3045 struct net *net = sock_net(skb->sk);
96518518 3046 int family = nfmsg->nfgen_family;
0854db2a 3047 struct nftables_pernet *nft_net;
96518518 3048
e688a7f8 3049 rcu_read_lock();
d59d2f82 3050 nft_net = nft_pernet(net);
0854db2a 3051 cb->seq = nft_net->base_seq;
38e029f1 3052
0854db2a 3053 list_for_each_entry_rcu(table, &nft_net->tables, list) {
98319cb9 3054 if (family != NFPROTO_UNSPEC && family != table->family)
36596dad
PNA		 3055 continue;
3056
3057 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
96518518
PM		 3058 continue;
3059
715849ab 3060 if (ctx && ctx->table && ctx->chain) {
241faece 3061 struct rhlist_head *list, *tmp;
6e1f760e 3062
241faece
PS		 3063 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3064 nft_chain_ht_params);
3065 if (!list)
3066 goto done;
3067
3068 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3069 if (!nft_is_active(net, chain))
3070 continue;
3071 __nf_tables_dump_rules(skb, &idx,
3072 cb, table, chain);
3073 break;
96518518 3074 }
241faece 3075 goto done;
96518518 3076 }
241faece
PS		 3077
3078 list_for_each_entry_rcu(chain, &table->chains, list) {
3079 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
3080 goto done;
3081 }
3082
3083 if (ctx && ctx->table)
3084 break;
96518518
PM		 3085 }
3086done:
e688a7f8 3087 rcu_read_unlock();
310529e6
PS		 3088
3089 cb->args[0] = idx;
96518518
PM		 3090 return skb->len;
3091}
3092
90fd131a
FW		 3093static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3094{
3095 const struct nlattr * const *nla = cb->data;
3096 struct nft_rule_dump_ctx *ctx = NULL;
3097
3098 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3099 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3100 if (!ctx)
3101 return -ENOMEM;
3102
3103 if (nla[NFTA_RULE_TABLE]) {
3104 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3105 GFP_ATOMIC);
3106 if (!ctx->table) {
3107 kfree(ctx);
3108 return -ENOMEM;
3109 }
3110 }
3111 if (nla[NFTA_RULE_CHAIN]) {
3112 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3113 GFP_ATOMIC);
3114 if (!ctx->chain) {
3115 kfree(ctx->table);
3116 kfree(ctx);
3117 return -ENOMEM;
3118 }
3119 }
3120 }
3121
3122 cb->data = ctx;
3123 return 0;
3124}
3125
6e1f760e
PNA		 3126static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3127{
e46abbcc
PS		 3128 struct nft_rule_dump_ctx *ctx = cb->data;
3129
3130 if (ctx) {
3131 kfree(ctx->table);
b7263e07 3132 kfree(ctx->chain);
e46abbcc
PS		 3133 kfree(ctx);
3134 }
6e1f760e
PNA		 3135 return 0;
3136}
3137
d9adf22a 3138/* called with rcu_read_lock held */
797d4980
PNA		 3139static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3140 const struct nlattr * const nla[])
96518518 3141{
797d4980
PNA		 3142 struct netlink_ext_ack *extack = info->extack;
3143 u8 genmask = nft_genmask_cur(info->net);
ef4b65e5 3144 u8 family = info->nfmsg->nfgen_family;
96518518
PM		 3145 const struct nft_chain *chain;
3146 const struct nft_rule *rule;
797d4980 3147 struct net *net = info->net;
1b2470e5 3148 struct nft_table *table;
96518518 3149 struct sk_buff *skb2;
96518518
PM		 3150 int err;
3151
797d4980 3152 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
96518518 3153 struct netlink_dump_control c = {
90fd131a 3154 .start= nf_tables_dump_rules_start,
96518518 3155 .dump = nf_tables_dump_rules,
6e1f760e 3156 .done = nf_tables_dump_rules_done,
d9adf22a 3157 .module = THIS_MODULE,
90fd131a 3158 .data = (void *)nla,
96518518 3159 };
6e1f760e 3160
797d4980 3161 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
96518518
PM		 3162 }
3163
6001a930 3164 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
36dd1bcc
PNA		 3165 if (IS_ERR(table)) {
3166 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
96518518 3167 return PTR_ERR(table);
36dd1bcc 3168 }
96518518 3169
f102d66b 3170 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
36dd1bcc
PNA		 3171 if (IS_ERR(chain)) {
3172 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
96518518 3173 return PTR_ERR(chain);
36dd1bcc 3174 }
96518518 3175
cac20fcd 3176 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
36dd1bcc
PNA		 3177 if (IS_ERR(rule)) {
3178 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
96518518 3179 return PTR_ERR(rule);
36dd1bcc 3180 }
96518518 3181
d9adf22a 3182 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
96518518
PM		 3183 if (!skb2)
3184 return -ENOMEM;
3185
84d7fce6 3186 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
797d4980 3187 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
e189ae16 3188 family, table, chain, rule, 0);
96518518 3189 if (err < 0)
ee921183 3190 goto err_fill_rule_info;
96518518 3191
ee921183 3192 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
96518518 3193
ee921183 3194err_fill_rule_info:
96518518
PM		 3195 kfree_skb(skb2);
3196 return err;
3197}
3198
62472bce
PM		 3199static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3200 struct nft_rule *rule)
96518518 3201{
29e38801 3202 struct nft_expr *expr, *next;
96518518
PM		 3203
3204 /*
3205 * Careful: some expressions might not be initialized in case this
3206 * is called on error from nf_tables_newrule().
3207 */
3208 expr = nft_expr_first(rule);
31cc578a 3209 while (nft_expr_more(rule, expr)) {
29e38801 3210 next = nft_expr_next(expr);
62472bce 3211 nf_tables_expr_destroy(ctx, expr);
29e38801 3212 expr = next;
96518518
PM		 3213 }
3214 kfree(rule);
3215}
3216
d0e2c7de 3217void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
bb7b40ae 3218{
f6ac8585 3219 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
bb7b40ae
PNA		 3220 nf_tables_rule_destroy(ctx, rule);
3221}
3222
a654de8f
PNA		 3223int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3224{
3225 struct nft_expr *expr, *last;
3226 const struct nft_data *data;
3227 struct nft_rule *rule;
3228 int err;
3229
26b2f552
TY		 3230 if (ctx->level == NFT_JUMP_STACK_SIZE)
3231 return -EMLINK;
3232
a654de8f
PNA		 3233 list_for_each_entry(rule, &chain->rules, list) {
3234 if (!nft_is_active_next(ctx->net, rule))
3235 continue;
3236
3237 nft_rule_for_each_expr(expr, last, rule) {
3238 if (!expr->ops->validate)
3239 continue;
3240
3241 err = expr->ops->validate(ctx, expr, &data);
3242 if (err < 0)
3243 return err;
3244 }
3245 }
3246
3247 return 0;
3248}
3249EXPORT_SYMBOL_GPL(nft_chain_validate);
3250
3251static int nft_table_validate(struct net *net, const struct nft_table *table)
3252{
3253 struct nft_chain *chain;
3254 struct nft_ctx ctx = {
3255 .net = net,
3256 .family = table->family,
3257 };
3258 int err;
3259
3260 list_for_each_entry(chain, &table->chains, list) {
3261 if (!nft_is_base_chain(chain))
3262 continue;
3263
3264 ctx.chain = chain;
3265 err = nft_chain_validate(&ctx, chain);
3266 if (err < 0)
3267 return err;
3268 }
3269
3270 return 0;
3271}
3272
75dd48e2
PS		 3273static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3274 const struct nlattr *nla);
3275
1081d11b
PNA		 3276#define NFT_RULE_MAXEXPRS 128
3277
7dab8ee3
PNA		 3278static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3279 const struct nlattr * const nla[])
96518518 3280{
7dab8ee3 3281 struct nftables_pernet *nft_net = nft_pernet(info->net);
7dab8ee3
PNA		 3282 struct netlink_ext_ack *extack = info->extack;
3283 unsigned int size, i, n, ulen = 0, usize = 0;
3284 u8 genmask = nft_genmask_next(info->net);
3285 struct nft_rule *rule, *old_rule = NULL;
3286 struct nft_expr_info *expr_info = NULL;
ef4b65e5 3287 u8 family = info->nfmsg->nfgen_family;
3c5e4462 3288 struct nft_flow_rule *flow = NULL;
7dab8ee3 3289 struct net *net = info->net;
7dab8ee3 3290 struct nft_userdata *udata;
96518518
PM		 3291 struct nft_table *table;
3292 struct nft_chain *chain;
7dab8ee3
PNA		 3293 struct nft_trans *trans;
3294 u64 handle, pos_handle;
96518518
PM		 3295 struct nft_expr *expr;
3296 struct nft_ctx ctx;
3297 struct nlattr *tmp;
96518518 3298 int err, rem;
96518518 3299
0854db2a 3300 lockdep_assert_held(&nft_net->commit_mutex);
f102d66b 3301
6001a930
PNA		 3302 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3303 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 3304 if (IS_ERR(table)) {
3305 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
96518518 3306 return PTR_ERR(table);
36dd1bcc 3307 }
96518518 3308
837830a4
PNA		 3309 if (nla[NFTA_RULE_CHAIN]) {
3310 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3311 genmask);
3312 if (IS_ERR(chain)) {
3313 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3314 return PTR_ERR(chain);
3315 }
d0e2c7de
PNA		 3316 if (nft_chain_is_bound(chain))
3317 return -EOPNOTSUPP;
3318
837830a4
PNA		 3319 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3320 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3321 if (IS_ERR(chain)) {
3322 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3323 return PTR_ERR(chain);
3324 }
3325 } else {
3326 return -EINVAL;
36dd1bcc 3327 }
96518518
PM		 3328
3329 if (nla[NFTA_RULE_HANDLE]) {
3330 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
cac20fcd 3331 rule = __nft_rule_lookup(chain, handle);
36dd1bcc
PNA		 3332 if (IS_ERR(rule)) {
3333 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
96518518 3334 return PTR_ERR(rule);
36dd1bcc 3335 }
96518518 3336
7dab8ee3 3337 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
36dd1bcc 3338 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
96518518 3339 return -EEXIST;
36dd1bcc 3340 }
7dab8ee3 3341 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
96518518
PM		 3342 old_rule = rule;
3343 else
3344 return -EOPNOTSUPP;
3345 } else {
7dab8ee3
PNA		 3346 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3347 info->nlh->nlmsg_flags & NLM_F_REPLACE)
96518518
PM		 3348 return -EINVAL;
3349 handle = nf_tables_alloc_handle(table);
a0a7379e
PNA		 3350
3351 if (chain->use == UINT_MAX)
3352 return -EOVERFLOW;
5e948466 3353
447750f2
FW		 3354 if (nla[NFTA_RULE_POSITION]) {
3355 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3356 old_rule = __nft_rule_lookup(chain, pos_handle);
3357 if (IS_ERR(old_rule)) {
3358 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3359 return PTR_ERR(old_rule);
3360 }
75dd48e2
PS		 3361 } else if (nla[NFTA_RULE_POSITION_ID]) {
3362 old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3363 if (IS_ERR(old_rule)) {
3364 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3365 return PTR_ERR(old_rule);
3366 }
36dd1bcc 3367 }
5e948466
EL		 3368 }
3369
7dab8ee3 3370 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
0ca743a5 3371
96518518
PM		 3372 n = 0;
3373 size = 0;
3374 if (nla[NFTA_RULE_EXPRESSIONS]) {
7dab8ee3
PNA		 3375 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3376 sizeof(struct nft_expr_info),
3377 GFP_KERNEL);
3378 if (!expr_info)
2a43ecf9
FW		 3379 return -ENOMEM;
3380
96518518
PM		 3381 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3382 err = -EINVAL;
3383 if (nla_type(tmp) != NFTA_LIST_ELEM)
3c5e4462 3384 goto err_release_expr;
96518518 3385 if (n == NFT_RULE_MAXEXPRS)
3c5e4462 3386 goto err_release_expr;
7dab8ee3 3387 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
c781471d
PNA		 3388 if (err < 0) {
3389 NL_SET_BAD_ATTR(extack, tmp);
3c5e4462 3390 goto err_release_expr;
c781471d 3391 }
7dab8ee3 3392 size += expr_info[n].ops->size;
96518518
PM		 3393 n++;
3394 }
3395 }
9889840f
PM		 3396 /* Check for overflow of dlen field */
3397 err = -EFBIG;
3398 if (size >= 1 << 12)
3c5e4462 3399 goto err_release_expr;
96518518 3400
86f1ec32 3401 if (nla[NFTA_RULE_USERDATA]) {
0768b3b3 3402 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
86f1ec32
PM		 3403 if (ulen > 0)
3404 usize = sizeof(struct nft_userdata) + ulen;
3405 }
0768b3b3 3406
96518518 3407 err = -ENOMEM;
86f1ec32 3408 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
96518518 3409 if (rule == NULL)
3c5e4462 3410 goto err_release_expr;
96518518 3411
889f7ee7 3412 nft_activate_next(net, rule);
0628b123 3413
96518518
PM		 3414 rule->handle = handle;
3415 rule->dlen = size;
86f1ec32 3416 rule->udata = ulen ? 1 : 0;
0768b3b3 3417
86f1ec32
PM		 3418 if (ulen) {
3419 udata = nft_userdata(rule);
3420 udata->len = ulen - 1;
3421 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3422 }
96518518 3423
96518518
PM		 3424 expr = nft_expr_first(rule);
3425 for (i = 0; i < n; i++) {
7dab8ee3 3426 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
83d9dcba 3427 if (err < 0) {
7dab8ee3 3428 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3c5e4462 3429 goto err_release_rule;
83d9dcba 3430 }
a654de8f 3431
7dab8ee3 3432 if (expr_info[i].ops->validate)
a654de8f
PNA		 3433 nft_validate_state_update(net, NFT_VALIDATE_NEED);
3434
7dab8ee3 3435 expr_info[i].ops = NULL;
96518518
PM		 3436 expr = nft_expr_next(expr);
3437 }
3438
3c5e4462
PNA		 3439 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3440 flow = nft_flow_rule_create(net, rule);
3441 if (IS_ERR(flow)) {
3442 err = PTR_ERR(flow);
3443 goto err_release_rule;
3444 }
3445 }
3446
7dab8ee3 3447 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
2c964c55
PNA		 3448 err = nft_delrule(&ctx, old_rule);
3449 if (err < 0)
3450 goto err_destroy_flow_rule;
3451
ca089878 3452 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
569ccae6
FW		 3453 if (trans == NULL) {
3454 err = -ENOMEM;
3c5e4462 3455 goto err_destroy_flow_rule;
569ccae6 3456 }
569ccae6
FW		 3457 list_add_tail_rcu(&rule->list, &old_rule->list);
3458 } else {
c9626a2c
PNA		 3459 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3460 if (!trans) {
569ccae6 3461 err = -ENOMEM;
3c5e4462 3462 goto err_destroy_flow_rule;
569ccae6
FW		 3463 }
3464
7dab8ee3 3465 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
569ccae6
FW		 3466 if (old_rule)
3467 list_add_rcu(&rule->list, &old_rule->list);
3468 else
3469 list_add_tail_rcu(&rule->list, &chain->rules);
3470 } else {
3471 if (old_rule)
3472 list_add_tail_rcu(&rule->list, &old_rule->list);
3473 else
3474 list_add_rcu(&rule->list, &chain->rules);
3475 }
0628b123 3476 }
7dab8ee3 3477 kvfree(expr_info);
4fefee57 3478 chain->use++;
96518518 3479
3c5e4462
PNA		 3480 if (flow)
3481 nft_trans_flow_rule(trans) = flow;
3482
0854db2a 3483 if (nft_net->validate_state == NFT_VALIDATE_DO)
a654de8f
PNA		 3484 return nft_table_validate(net, table);
3485
3486 return 0;
3c5e4462
PNA		 3487
3488err_destroy_flow_rule:
4ca041f9
CIK		 3489 if (flow)
3490 nft_flow_rule_destroy(flow);
3c5e4462 3491err_release_rule:
bb7b40ae 3492 nf_tables_rule_release(&ctx, rule);
3c5e4462 3493err_release_expr:
96518518 3494 for (i = 0; i < n; i++) {
7dab8ee3
PNA		 3495 if (expr_info[i].ops) {
3496 module_put(expr_info[i].ops->type->owner);
3497 if (expr_info[i].ops->type->release_ops)
3498 expr_info[i].ops->type->release_ops(expr_info[i].ops);
b25a31bf 3499 }
96518518 3500 }
7dab8ee3
PNA		 3501 kvfree(expr_info);
3502
96518518
PM		 3503 return err;
3504}
3505
1a94e38d
PNA		 3506static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3507 const struct nlattr *nla)
3508{
d59d2f82 3509 struct nftables_pernet *nft_net = nft_pernet(net);
1a94e38d
PNA		 3510 u32 id = ntohl(nla_get_be32(nla));
3511 struct nft_trans *trans;
3512
0854db2a 3513 list_for_each_entry(trans, &nft_net->commit_list, list) {
1a94e38d
PNA		 3514 struct nft_rule *rule = nft_trans_rule(trans);
3515
3516 if (trans->msg_type == NFT_MSG_NEWRULE &&
3517 id == nft_trans_rule_id(trans))
3518 return rule;
3519 }
3520 return ERR_PTR(-ENOENT);
3521}
3522
7dab8ee3
PNA		 3523static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3524 const struct nlattr * const nla[])
96518518 3525{
7dab8ee3 3526 struct netlink_ext_ack *extack = info->extack;
7dab8ee3 3527 u8 genmask = nft_genmask_next(info->net);
ef4b65e5 3528 u8 family = info->nfmsg->nfgen_family;
cf9dc09d 3529 struct nft_chain *chain = NULL;
7dab8ee3
PNA		 3530 struct net *net = info->net;
3531 struct nft_table *table;
cf9dc09d 3532 struct nft_rule *rule;
0628b123 3533 struct nft_ctx ctx;
ef4b65e5 3534 int err = 0;
96518518 3535
6001a930
PNA		 3536 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3537 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 3538 if (IS_ERR(table)) {
3539 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
96518518 3540 return PTR_ERR(table);
36dd1bcc 3541 }
96518518 3542
cf9dc09d 3543 if (nla[NFTA_RULE_CHAIN]) {
f102d66b
FW		 3544 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3545 genmask);
36dd1bcc
PNA		 3546 if (IS_ERR(chain)) {
3547 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
cf9dc09d 3548 return PTR_ERR(chain);
36dd1bcc 3549 }
d0e2c7de
PNA		 3550 if (nft_chain_is_bound(chain))
3551 return -EOPNOTSUPP;
cf9dc09d 3552 }
96518518 3553
7dab8ee3 3554 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
0628b123 3555
cf9dc09d
PNA		 3556 if (chain) {
3557 if (nla[NFTA_RULE_HANDLE]) {
cac20fcd 3558 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
36dd1bcc
PNA		 3559 if (IS_ERR(rule)) {
3560 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
cf9dc09d 3561 return PTR_ERR(rule);
36dd1bcc 3562 }
96518518 3563
1a94e38d
PNA		 3564 err = nft_delrule(&ctx, rule);
3565 } else if (nla[NFTA_RULE_ID]) {
3566 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
36dd1bcc
PNA		 3567 if (IS_ERR(rule)) {
3568 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
1a94e38d 3569 return PTR_ERR(rule);
36dd1bcc 3570 }
1a94e38d 3571
5e266fe7 3572 err = nft_delrule(&ctx, rule);
cf9dc09d 3573 } else {
ce24b721 3574 err = nft_delrule_by_chain(&ctx);
cf9dc09d
PNA		 3575 }
3576 } else {
3577 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 3578 if (!nft_is_active_next(net, chain))
3579 continue;
3580
cf9dc09d 3581 ctx.chain = chain;
ce24b721 3582 err = nft_delrule_by_chain(&ctx);
0628b123
PNA		 3583 if (err < 0)
3584 break;
3585 }
3586 }
3587
3588 return err;
3589}
3590
20a69341
PM		 3591/*
3592 * Sets
3593 */
e32a4dc6
FW		 3594static const struct nft_set_type *nft_set_types[] = {
3595 &nft_set_hash_fast_type,
3596 &nft_set_hash_type,
3597 &nft_set_rhash_type,
3598 &nft_set_bitmap_type,
3599 &nft_set_rbtree_type,
e6abef61 3600#if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
7400b063
SB		 3601 &nft_set_pipapo_avx2_type,
3602#endif
e32a4dc6
FW		 3603 &nft_set_pipapo_type,
3604};
20a69341 3605
2b664957 3606#define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
71cc0873
PS		 3607 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3608 NFT_SET_EVAL)
2b664957 3609
71cc0873 3610static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
2b664957 3611{
71cc0873 3612 return (flags & type->features) == (flags & NFT_SET_FEATURES);
2b664957
PNA		 3613}
3614
c50b960c
PM		 3615/*
3616 * Select a set implementation based on the data characteristics and the
3617 * given policy. The total memory use might not be known if no size is
3618 * given, in that case the amount of memory per element is used.
3619 */
3620static const struct nft_set_ops *
2b664957
PNA		 3621nft_select_set_ops(const struct nft_ctx *ctx,
3622 const struct nlattr * const nla[],
c50b960c
PM		 3623 const struct nft_set_desc *desc,
3624 enum nft_set_policies policy)
20a69341 3625{
d59d2f82 3626 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
c50b960c
PM		 3627 const struct nft_set_ops *ops, *bops;
3628 struct nft_set_estimate est, best;
2b664957
PNA		 3629 const struct nft_set_type *type;
3630 u32 flags = 0;
e32a4dc6 3631 int i;
20a69341 3632
0854db2a 3633 lockdep_assert_held(&nft_net->commit_mutex);
f102d66b 3634 lockdep_nfnl_nft_mutex_not_held();
e32a4dc6 3635
2b664957
PNA		 3636 if (nla[NFTA_SET_FLAGS] != NULL)
3637 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
20a69341 3638
55af753c
PNA		 3639 bops = NULL;
3640 best.size = ~0;
3641 best.lookup = ~0;
0b5a7874 3642 best.space = ~0;
c50b960c 3643
e32a4dc6
FW		 3644 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3645 type = nft_set_types[i];
71cc0873 3646 ops = &type->ops;
2b664957 3647
71cc0873 3648 if (!nft_set_ops_candidate(type, flags))
20a69341 3649 continue;
2b664957 3650 if (!ops->estimate(desc, flags, &est))
c50b960c
PM		 3651 continue;
3652
3653 switch (policy) {
3654 case NFT_SET_POL_PERFORMANCE:
55af753c 3655 if (est.lookup < best.lookup)
c50b960c 3656 break;
644e334e
PNA		 3657 if (est.lookup == best.lookup &&
3658 est.space < best.space)
3659 break;
c50b960c
PM		 3660 continue;
3661 case NFT_SET_POL_MEMORY:
0b5a7874
PNA		 3662 if (!desc->size) {
3663 if (est.space < best.space)
3664 break;
3665 if (est.space == best.space &&
3666 est.lookup < best.lookup)
3667 break;
4f2921ca 3668 } else if (est.size < best.size || !bops) {
c50b960c 3669 break;
0b5a7874 3670 }
c50b960c
PM		 3671 continue;
3672 default:
3673 break;
3674 }
3675
c50b960c
PM		 3676 bops = ops;
3677 best = est;
20a69341
PM		 3678 }
3679
c50b960c
PM		 3680 if (bops != NULL)
3681 return bops;
3682
20a69341
PM		 3683 return ERR_PTR(-EOPNOTSUPP);
3684}
3685
3686static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
b2fbd044
LZ		 3687 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3688 .len = NFT_TABLE_MAXNAMELEN - 1 },
a9bdd836 3689 [NFTA_SET_NAME] = { .type = NLA_STRING,
cb39ad8b 3690 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341
PM		 3691 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3692 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3693 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3694 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3695 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
c50b960c
PM		 3696 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3697 [NFTA_SET_DESC] = { .type = NLA_NESTED },
958bee14 3698 [NFTA_SET_ID] = { .type = NLA_U32 },
761da293
PM		 3699 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3700 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
e6d8ecac
CFG		 3701 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3702 .len = NFT_USERDATA_MAXLEN },
8aeff920 3703 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3ecbfd65 3704 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
65038428 3705 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
48b0ae04 3706 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
c50b960c
PM		 3707};
3708
3709static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3710 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
f3a2181e 3711 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
20a69341
PM		 3712};
3713
cac20fcd
PNA		 3714static struct nft_set *nft_set_lookup(const struct nft_table *table,
3715 const struct nlattr *nla, u8 genmask)
20a69341
PM		 3716{
3717 struct nft_set *set;
3718
3719 if (nla == NULL)
3720 return ERR_PTR(-EINVAL);
3721
d9adf22a 3722 list_for_each_entry_rcu(set, &table->sets, list) {
37a9cc52
PNA		 3723 if (!nla_strcmp(nla, set->name) &&
3724 nft_active_genmask(set, genmask))
20a69341
PM		 3725 return set;
3726 }
3727 return ERR_PTR(-ENOENT);
3728}
3729
cac20fcd
PNA		 3730static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3731 const struct nlattr *nla,
3732 u8 genmask)
3ecbfd65
HS		 3733{
3734 struct nft_set *set;
3735
3ecbfd65
HS		 3736 list_for_each_entry(set, &table->sets, list) {
3737 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3738 nft_active_genmask(set, genmask))
3739 return set;
3740 }
3741 return ERR_PTR(-ENOENT);
3742}
3743
cac20fcd
PNA		 3744static struct nft_set *nft_set_lookup_byid(const struct net *net,
3745 const struct nlattr *nla, u8 genmask)
958bee14 3746{
d59d2f82 3747 struct nftables_pernet *nft_net = nft_pernet(net);
958bee14 3748 u32 id = ntohl(nla_get_be32(nla));
d59d2f82 3749 struct nft_trans *trans;
958bee14 3750
0854db2a 3751 list_for_each_entry(trans, &nft_net->commit_list, list) {
9c7f96fd
AK		 3752 if (trans->msg_type == NFT_MSG_NEWSET) {
3753 struct nft_set *set = nft_trans_set(trans);
37a9cc52 3754
9c7f96fd
AK		 3755 if (id == nft_trans_set_id(trans) &&
3756 nft_active_genmask(set, genmask))
3757 return set;
3758 }
958bee14
PNA		 3759 }
3760 return ERR_PTR(-ENOENT);
3761}
c7a72e3f 3762
10659cba
PNA		 3763struct nft_set *nft_set_lookup_global(const struct net *net,
3764 const struct nft_table *table,
3765 const struct nlattr *nla_set_name,
3766 const struct nlattr *nla_set_id,
3767 u8 genmask)
c7a72e3f
PNA		 3768{
3769 struct nft_set *set;
3770
cac20fcd 3771 set = nft_set_lookup(table, nla_set_name, genmask);
c7a72e3f
PNA		 3772 if (IS_ERR(set)) {
3773 if (!nla_set_id)
3774 return set;
3775
cac20fcd 3776 set = nft_set_lookup_byid(net, nla_set_id, genmask);
c7a72e3f
PNA		 3777 }
3778 return set;
3779}
10659cba 3780EXPORT_SYMBOL_GPL(nft_set_lookup_global);
958bee14 3781
20a69341
PM		 3782static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3783 const char *name)
3784{
3785 const struct nft_set *i;
3786 const char *p;
3787 unsigned long *inuse;
60eb1894 3788 unsigned int n = 0, min = 0;
20a69341 3789
38745490 3790 p = strchr(name, '%');
20a69341
PM		 3791 if (p != NULL) {
3792 if (p[1] != 'd' || strchr(p + 2, '%'))
3793 return -EINVAL;
3794
3795 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3796 if (inuse == NULL)
3797 return -ENOMEM;
60eb1894 3798cont:
20a69341 3799 list_for_each_entry(i, &ctx->table->sets, list) {
14662917
DB		 3800 int tmp;
3801
37a9cc52
PNA		 3802 if (!nft_is_active_next(ctx->net, set))
3803 continue;
14662917 3804 if (!sscanf(i->name, name, &tmp))
20a69341 3805 continue;
60eb1894 3806 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
20a69341 3807 continue;
14662917 3808
60eb1894 3809 set_bit(tmp - min, inuse);
20a69341
PM		 3810 }
3811
53b70287 3812 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
60eb1894
PM		 3813 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3814 min += BITS_PER_BYTE * PAGE_SIZE;
3815 memset(inuse, 0, PAGE_SIZE);
3816 goto cont;
3817 }
20a69341
PM		 3818 free_page((unsigned long)inuse);
3819 }
3820
38745490
PS		 3821 set->name = kasprintf(GFP_KERNEL, name, min + n);
3822 if (!set->name)
3823 return -ENOMEM;
3824
20a69341 3825 list_for_each_entry(i, &ctx->table->sets, list) {
37a9cc52
PNA		 3826 if (!nft_is_active_next(ctx->net, i))
3827 continue;
e63aaaa6
AY		 3828 if (!strcmp(set->name, i->name)) {
3829 kfree(set->name);
7fb6f78d 3830 set->name = NULL;
20a69341 3831 return -ENFILE;
e63aaaa6 3832 }
20a69341
PM		 3833 }
3834 return 0;
3835}
3836
917d80d3 3837int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
8e1102d5
FW		 3838{
3839 u64 ms = be64_to_cpu(nla_get_be64(nla));
3840 u64 max = (u64)(~((u64)0));
3841
3842 max = div_u64(max, NSEC_PER_MSEC);
3843 if (ms >= max)
3844 return -ERANGE;
3845
3846 ms *= NSEC_PER_MSEC;
3847 *result = nsecs_to_jiffies64(ms);
3848 return 0;
3849}
3850
917d80d3 3851__be64 nf_jiffies64_to_msecs(u64 input)
8e1102d5 3852{
3b15d09f 3853 return cpu_to_be64(jiffies64_to_msecs(input));
8e1102d5
FW		 3854}
3855
f3a2181e
SB		 3856static int nf_tables_fill_set_concat(struct sk_buff *skb,
3857 const struct nft_set *set)
3858{
3859 struct nlattr *concat, *field;
3860 int i;
3861
3862 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3863 if (!concat)
3864 return -ENOMEM;
3865
3866 for (i = 0; i < set->field_count; i++) {
3867 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3868 if (!field)
3869 return -ENOMEM;
3870
3871 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3872 htonl(set->field_len[i])))
3873 return -ENOMEM;
3874
3875 nla_nest_end(skb, field);
3876 }
3877
3878 nla_nest_end(skb, concat);
3879
3880 return 0;
3881}
3882
20a69341
PM		 3883static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3884 const struct nft_set *set, u16 event, u16 flags)
3885{
20a69341 3886 struct nlmsghdr *nlh;
128ad332 3887 u32 portid = ctx->portid;
65038428 3888 struct nlattr *nest;
128ad332 3889 u32 seq = ctx->seq;
48b0ae04 3890 int i;
20a69341 3891
dedb67c4 3892 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
19c28b13
PNA		 3893 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
3894 NFNETLINK_V0, nft_base_seq(ctx->net));
3895 if (!nlh)
20a69341
PM		 3896 goto nla_put_failure;
3897
20a69341
PM		 3898 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3899 goto nla_put_failure;
3900 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3901 goto nla_put_failure;
3ecbfd65
HS		 3902 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3903 NFTA_SET_PAD))
3904 goto nla_put_failure;
20a69341
PM		 3905 if (set->flags != 0)
3906 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3907 goto nla_put_failure;
3908
3909 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3910 goto nla_put_failure;
3911 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3912 goto nla_put_failure;
3913 if (set->flags & NFT_SET_MAP) {
3914 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3915 goto nla_put_failure;
3916 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3917 goto nla_put_failure;
3918 }
8aeff920
PNA		 3919 if (set->flags & NFT_SET_OBJECT &&
3920 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3921 goto nla_put_failure;
20a69341 3922
761da293 3923 if (set->timeout &&
d3e2a111 3924 nla_put_be64(skb, NFTA_SET_TIMEOUT,
8e1102d5 3925 nf_jiffies64_to_msecs(set->timeout),
b46f6ded 3926 NFTA_SET_PAD))
761da293
PM		 3927 goto nla_put_failure;
3928 if (set->gc_int &&
3929 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3930 goto nla_put_failure;
3931
9363dc4b
AB		 3932 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3933 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3934 goto nla_put_failure;
3935 }
3936
6f03bf43
PNA		 3937 if (set->udata &&
3938 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
e6d8ecac
CFG		 3939 goto nla_put_failure;
3940
65038428
PNA		 3941 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3942 if (!nest)
c50b960c
PM		 3943 goto nla_put_failure;
3944 if (set->size &&
3945 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3946 goto nla_put_failure;
f3a2181e
SB		 3947
3948 if (set->field_count > 1 &&
3949 nf_tables_fill_set_concat(skb, set))
3950 goto nla_put_failure;
3951
65038428
PNA		 3952 nla_nest_end(skb, nest);
3953
8cfd9b0f 3954 if (set->num_exprs == 1) {
65038428 3955 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
8cfd9b0f 3956 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
65038428
PNA		 3957 goto nla_put_failure;
3958
3959 nla_nest_end(skb, nest);
48b0ae04
PNA		 3960 } else if (set->num_exprs > 1) {
3961 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
3962 if (nest == NULL)
65038428
PNA		 3963 goto nla_put_failure;
3964
48b0ae04
PNA		 3965 for (i = 0; i < set->num_exprs; i++) {
3966 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
3967 set->exprs[i]) < 0)
3968 goto nla_put_failure;
3969 }
65038428
PNA		 3970 nla_nest_end(skb, nest);
3971 }
c50b960c 3972
053c095a
JB		 3973 nlmsg_end(skb, nlh);
3974 return 0;
20a69341
PM		 3975
3976nla_put_failure:
3977 nlmsg_trim(skb, nlh);
3978 return -1;
3979}
3980
25e94a99
PNA		 3981static void nf_tables_set_notify(const struct nft_ctx *ctx,
3982 const struct nft_set *set, int event,
3983 gfp_t gfp_flags)
20a69341 3984{
d59d2f82 3985 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
128ad332 3986 u32 portid = ctx->portid;
6fb721cf
PNA		 3987 struct sk_buff *skb;
3988 u16 flags = 0;
20a69341
PM		 3989 int err;
3990
128ad332
PNA		 3991 if (!ctx->report &&
3992 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 3993 return;
20a69341 3994
31f8441c 3995 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
20a69341
PM		 3996 if (skb == NULL)
3997 goto err;
3998
6fb721cf
PNA		 3999 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4000 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4001
4002 err = nf_tables_fill_set(skb, ctx, set, event, flags);
20a69341
PM		 4003 if (err < 0) {
4004 kfree_skb(skb);
4005 goto err;
4006 }
4007
0854db2a 4008 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
25e94a99 4009 return;
20a69341 4010err:
25e94a99 4011 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
20a69341
PM		 4012}
4013
5b96af77 4014static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
c9c8e485
PNA		 4015{
4016 const struct nft_set *set;
4017 unsigned int idx, s_idx = cb->args[0];
c9c8e485
PNA		 4018 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4019 struct net *net = sock_net(skb->sk);
5b96af77 4020 struct nft_ctx *ctx = cb->data, ctx_set;
0854db2a 4021 struct nftables_pernet *nft_net;
c9c8e485
PNA		 4022
4023 if (cb->args[1])
4024 return skb->len;
4025
e688a7f8 4026 rcu_read_lock();
d59d2f82 4027 nft_net = nft_pernet(net);
0854db2a 4028 cb->seq = nft_net->base_seq;
38e029f1 4029
0854db2a 4030 list_for_each_entry_rcu(table, &nft_net->tables, list) {
36596dad 4031 if (ctx->family != NFPROTO_UNSPEC &&
98319cb9 4032 ctx->family != table->family)
36596dad
PNA		 4033 continue;
4034
4035 if (ctx->table && ctx->table != table)
5b96af77
PNA		 4036 continue;
4037
36596dad
PNA		 4038 if (cur_table) {
4039 if (cur_table != table)
c9c8e485
PNA		 4040 continue;
4041
36596dad 4042 cur_table = NULL;
c9c8e485 4043 }
36596dad
PNA		 4044 idx = 0;
4045 list_for_each_entry_rcu(set, &table->sets, list) {
4046 if (idx < s_idx)
4047 goto cont;
4048 if (!nft_is_active(net, set))
4049 goto cont;
5b96af77 4050
36596dad
PNA		 4051 ctx_set = *ctx;
4052 ctx_set.table = table;
98319cb9 4053 ctx_set.family = table->family;
c9c8e485 4054
36596dad
PNA		 4055 if (nf_tables_fill_set(skb, &ctx_set, set,
4056 NFT_MSG_NEWSET,
4057 NLM_F_MULTI) < 0) {
4058 cb->args[0] = idx;
4059 cb->args[2] = (unsigned long) table;
4060 goto done;
c9c8e485 4061 }
36596dad 4062 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
c9c8e485 4063cont:
36596dad 4064 idx++;
c9c8e485 4065 }
36596dad
PNA		 4066 if (s_idx)
4067 s_idx = 0;
c9c8e485
PNA		 4068 }
4069 cb->args[1] = 1;
4070done:
e688a7f8 4071 rcu_read_unlock();
c9c8e485
PNA		 4072 return skb->len;
4073}
4074
90fd131a
FW		 4075static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4076{
4077 struct nft_ctx *ctx_dump = NULL;
4078
4079 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4080 if (ctx_dump == NULL)
4081 return -ENOMEM;
4082
4083 cb->data = ctx_dump;
4084 return 0;
4085}
4086
5b96af77 4087static int nf_tables_dump_sets_done(struct netlink_callback *cb)
20a69341 4088{
5b96af77
PNA		 4089 kfree(cb->data);
4090 return 0;
20a69341
PM		 4091}
4092
d9adf22a 4093/* called with rcu_read_lock held */
797d4980
PNA		 4094static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4095 const struct nlattr * const nla[])
20a69341 4096{
797d4980
PNA		 4097 struct netlink_ext_ack *extack = info->extack;
4098 u8 genmask = nft_genmask_cur(info->net);
67086651
PNA		 4099 u8 family = info->nfmsg->nfgen_family;
4100 struct nft_table *table = NULL;
797d4980 4101 struct net *net = info->net;
20a69341 4102 const struct nft_set *set;
20a69341 4103 struct sk_buff *skb2;
797d4980 4104 struct nft_ctx ctx;
20a69341
PM		 4105 int err;
4106
67086651
PNA		 4107 if (nla[NFTA_SET_TABLE]) {
4108 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4109 genmask, 0);
4110 if (IS_ERR(table)) {
4111 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4112 return PTR_ERR(table);
4113 }
4114 }
4115
4116 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
20a69341 4117
797d4980 4118 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
20a69341 4119 struct netlink_dump_control c = {
90fd131a 4120 .start = nf_tables_dump_sets_start,
20a69341 4121 .dump = nf_tables_dump_sets,
5b96af77 4122 .done = nf_tables_dump_sets_done,
90fd131a 4123 .data = &ctx,
d9adf22a 4124 .module = THIS_MODULE,
20a69341 4125 };
5b96af77 4126
797d4980 4127 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
20a69341
PM		 4128 }
4129
c9c8e485 4130 /* Only accept unspec with dump */
ef4b65e5 4131 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
c9c8e485 4132 return -EAFNOSUPPORT;
eaa2bcd6
PT		 4133 if (!nla[NFTA_SET_TABLE])
4134 return -EINVAL;
c9c8e485 4135
67086651 4136 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 4137 if (IS_ERR(set))
4138 return PTR_ERR(set);
4139
d9adf22a 4140 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
20a69341
PM		 4141 if (skb2 == NULL)
4142 return -ENOMEM;
4143
4144 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4145 if (err < 0)
ee921183 4146 goto err_fill_set_info;
20a69341 4147
ee921183 4148 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
20a69341 4149
ee921183 4150err_fill_set_info:
20a69341
PM		 4151 kfree_skb(skb2);
4152 return err;
4153}
4154
f3a2181e
SB		 4155static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4156 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4157};
4158
4159static int nft_set_desc_concat_parse(const struct nlattr *attr,
4160 struct nft_set_desc *desc)
4161{
4162 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4163 u32 len;
4164 int err;
4165
4166 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4167 nft_concat_policy, NULL);
4168 if (err < 0)
4169 return err;
4170
4171 if (!tb[NFTA_SET_FIELD_LEN])
4172 return -EINVAL;
4173
4174 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4175
4176 if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
4177 return -E2BIG;
4178
4179 desc->field_len[desc->field_count++] = len;
4180
4181 return 0;
4182}
4183
4184static int nft_set_desc_concat(struct nft_set_desc *desc,
4185 const struct nlattr *nla)
4186{
4187 struct nlattr *attr;
4188 int rem, err;
4189
4190 nla_for_each_nested(attr, nla, rem) {
4191 if (nla_type(attr) != NFTA_LIST_ELEM)
4192 return -EINVAL;
4193
4194 err = nft_set_desc_concat_parse(attr, desc);
4195 if (err < 0)
4196 return err;
4197 }
4198
4199 return 0;
4200}
4201
f7e840ee 4202static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
c50b960c
PM		 4203 const struct nlattr *nla)
4204{
4205 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4206 int err;
4207
8cb08174
JB		 4208 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4209 nft_set_desc_policy, NULL);
c50b960c
PM		 4210 if (err < 0)
4211 return err;
4212
4213 if (da[NFTA_SET_DESC_SIZE] != NULL)
4214 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
f3a2181e
SB		 4215 if (da[NFTA_SET_DESC_CONCAT])
4216 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
c50b960c 4217
f3a2181e 4218 return err;
c50b960c
PM		 4219}
4220
7dab8ee3
PNA		 4221static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4222 const struct nlattr * const nla[])
20a69341 4223{
7dab8ee3
PNA		 4224 u32 ktype, dtype, flags, policy, gc_int, objtype;
4225 struct netlink_ext_ack *extack = info->extack;
4226 u8 genmask = nft_genmask_next(info->net);
ef4b65e5 4227 u8 family = info->nfmsg->nfgen_family;
20a69341 4228 const struct nft_set_ops *ops;
65038428 4229 struct nft_expr *expr = NULL;
7dab8ee3
PNA		 4230 struct net *net = info->net;
4231 struct nft_set_desc desc;
20a69341 4232 struct nft_table *table;
7dab8ee3 4233 unsigned char *udata;
20a69341
PM		 4234 struct nft_set *set;
4235 struct nft_ctx ctx;
6c8774a9 4236 size_t alloc_size;
761da293 4237 u64 timeout;
7dab8ee3
PNA		 4238 char *name;
4239 int err, i;
e6d8ecac 4240 u16 udlen;
7dab8ee3 4241 u64 size;
20a69341
PM		 4242
4243 if (nla[NFTA_SET_TABLE] == NULL ||
4244 nla[NFTA_SET_NAME] == NULL ||
958bee14
PNA		 4245 nla[NFTA_SET_KEY_LEN] == NULL ||
4246 nla[NFTA_SET_ID] == NULL)
20a69341
PM		 4247 return -EINVAL;
4248
c50b960c
PM		 4249 memset(&desc, 0, sizeof(desc));
4250
20a69341
PM		 4251 ktype = NFT_DATA_VALUE;
4252 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4253 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4254 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4255 return -EINVAL;
4256 }
4257
c50b960c 4258 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
7d740264 4259 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 4260 return -EINVAL;
4261
4262 flags = 0;
4263 if (nla[NFTA_SET_FLAGS] != NULL) {
4264 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4265 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
7c6c6e95 4266 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
8aeff920 4267 NFT_SET_MAP | NFT_SET_EVAL |
b4e70d8d 4268 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
d9583cdf 4269 return -EOPNOTSUPP;
8aeff920 4270 /* Only one of these operations is supported */
acab7131
FW		 4271 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4272 (NFT_SET_MAP | NFT_SET_OBJECT))
4273 return -EOPNOTSUPP;
4274 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4275 (NFT_SET_EVAL | NFT_SET_OBJECT))
7c6c6e95 4276 return -EOPNOTSUPP;
20a69341
PM		 4277 }
4278
4279 dtype = 0;
20a69341
PM		 4280 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4281 if (!(flags & NFT_SET_MAP))
4282 return -EINVAL;
4283
4284 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4285 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4286 dtype != NFT_DATA_VERDICT)
4287 return -EINVAL;
4288
4289 if (dtype != NFT_DATA_VERDICT) {
4290 if (nla[NFTA_SET_DATA_LEN] == NULL)
4291 return -EINVAL;
c50b960c 4292 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
7d740264 4293 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 4294 return -EINVAL;
4295 } else
7d740264 4296 desc.dlen = sizeof(struct nft_verdict);
20a69341
PM		 4297 } else if (flags & NFT_SET_MAP)
4298 return -EINVAL;
4299
8aeff920
PNA		 4300 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4301 if (!(flags & NFT_SET_OBJECT))
4302 return -EINVAL;
4303
4304 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4305 if (objtype == NFT_OBJECT_UNSPEC ||
4306 objtype > NFT_OBJECT_MAX)
d9583cdf 4307 return -EOPNOTSUPP;
8aeff920
PNA		 4308 } else if (flags & NFT_SET_OBJECT)
4309 return -EINVAL;
4310 else
4311 objtype = NFT_OBJECT_UNSPEC;
4312
761da293
PM		 4313 timeout = 0;
4314 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4315 if (!(flags & NFT_SET_TIMEOUT))
4316 return -EINVAL;
8e1102d5
FW		 4317
4318 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4319 if (err)
4320 return err;
761da293
PM		 4321 }
4322 gc_int = 0;
4323 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4324 if (!(flags & NFT_SET_TIMEOUT))
4325 return -EINVAL;
4326 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4327 }
4328
c50b960c
PM		 4329 policy = NFT_SET_POL_PERFORMANCE;
4330 if (nla[NFTA_SET_POLICY] != NULL)
4331 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4332
4333 if (nla[NFTA_SET_DESC] != NULL) {
f7e840ee 4334 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
c50b960c
PM		 4335 if (err < 0)
4336 return err;
4337 }
4338
48b0ae04 4339 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
d56aab26
PNA		 4340 desc.expr = true;
4341
6001a930
PNA		 4342 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4343 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 4344 if (IS_ERR(table)) {
4345 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
20a69341 4346 return PTR_ERR(table);
36dd1bcc 4347 }
20a69341 4348
7dab8ee3 4349 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
20a69341 4350
cac20fcd 4351 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
20a69341 4352 if (IS_ERR(set)) {
36dd1bcc
PNA		 4353 if (PTR_ERR(set) != -ENOENT) {
4354 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
20a69341 4355 return PTR_ERR(set);
36dd1bcc 4356 }
1a28ad74 4357 } else {
7dab8ee3 4358 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
36dd1bcc 4359 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
20a69341 4360 return -EEXIST;
36dd1bcc 4361 }
7dab8ee3 4362 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
20a69341 4363 return -EOPNOTSUPP;
36dd1bcc 4364
20a69341
PM		 4365 return 0;
4366 }
4367
7dab8ee3 4368 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
20a69341
PM		 4369 return -ENOENT;
4370
2b664957 4371 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
20a69341
PM		 4372 if (IS_ERR(ops))
4373 return PTR_ERR(ops);
4374
e6d8ecac
CFG		 4375 udlen = 0;
4376 if (nla[NFTA_SET_USERDATA])
4377 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4378
20a69341
PM		 4379 size = 0;
4380 if (ops->privsize != NULL)
347b408d 4381 size = ops->privsize(nla, &desc);
6c8774a9 4382 alloc_size = sizeof(*set) + size + udlen;
45928afe 4383 if (alloc_size < size || alloc_size > INT_MAX)
6c8774a9
ED		 4384 return -ENOMEM;
4385 set = kvzalloc(alloc_size, GFP_KERNEL);
24d19826
FW		 4386 if (!set)
4387 return -ENOMEM;
20a69341 4388
38745490
PS		 4389 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4390 if (!name) {
4391 err = -ENOMEM;
65038428 4392 goto err_set_name;
38745490
PS		 4393 }
4394
20a69341 4395 err = nf_tables_set_alloc_name(&ctx, set, name);
38745490 4396 kfree(name);
20a69341 4397 if (err < 0)
ad9f151e
PNA		 4398 goto err_set_name;
4399
4400 udata = NULL;
4401 if (udlen) {
4402 udata = set->data + size;
4403 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4404 }
4405
4406 INIT_LIST_HEAD(&set->bindings);
4407 INIT_LIST_HEAD(&set->catchall_list);
4408 set->table = table;
4409 write_pnet(&set->net, net);
4410 set->ops = ops;
4411 set->ktype = ktype;
4412 set->klen = desc.klen;
4413 set->dtype = dtype;
4414 set->objtype = objtype;
4415 set->dlen = desc.dlen;
4416 set->flags = flags;
4417 set->size = desc.size;
4418 set->policy = policy;
4419 set->udlen = udlen;
4420 set->udata = udata;
4421 set->timeout = timeout;
4422 set->gc_int = gc_int;
4423
4424 set->field_count = desc.field_count;
4425 for (i = 0; i < desc.field_count; i++)
4426 set->field_len[i] = desc.field_len[i];
4427
4428 err = ops->init(set, &desc, nla);
4429 if (err < 0)
4430 goto err_set_init;
65038428
PNA		 4431
4432 if (nla[NFTA_SET_EXPR]) {
4433 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4434 if (IS_ERR(expr)) {
4435 err = PTR_ERR(expr);
ad9f151e 4436 goto err_set_expr_alloc;
65038428 4437 }
8cfd9b0f
PNA		 4438 set->exprs[0] = expr;
4439 set->num_exprs++;
48b0ae04
PNA		 4440 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4441 struct nft_expr *expr;
4442 struct nlattr *tmp;
4443 int left;
4444
b4e70d8d
PNA		 4445 if (!(flags & NFT_SET_EXPR)) {
4446 err = -EINVAL;
ad9f151e 4447 goto err_set_expr_alloc;
b4e70d8d 4448 }
48b0ae04
PNA		 4449 i = 0;
4450 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4451 if (i == NFT_SET_EXPR_MAX) {
4452 err = -E2BIG;
ad9f151e 4453 goto err_set_expr_alloc;
48b0ae04
PNA		 4454 }
4455 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4456 err = -EINVAL;
ad9f151e 4457 goto err_set_expr_alloc;
48b0ae04
PNA		 4458 }
4459 expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
4460 if (IS_ERR(expr)) {
4461 err = PTR_ERR(expr);
ad9f151e 4462 goto err_set_expr_alloc;
48b0ae04
PNA		 4463 }
4464 set->exprs[i++] = expr;
4465 set->num_exprs++;
4466 }
65038428 4467 }
20a69341 4468
3ecbfd65 4469 set->handle = nf_tables_alloc_handle(table);
20a69341 4470
958bee14 4471 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
20a69341 4472 if (err < 0)
ad9f151e 4473 goto err_set_expr_alloc;
20a69341 4474
e688a7f8 4475 list_add_tail_rcu(&set->list, &table->sets);
4fefee57 4476 table->use++;
20a69341
PM		 4477 return 0;
4478
ad9f151e 4479err_set_expr_alloc:
8cfd9b0f
PNA		 4480 for (i = 0; i < set->num_exprs; i++)
4481 nft_expr_destroy(&ctx, set->exprs[i]);
ad9f151e
PNA		 4482
4483 ops->destroy(set);
4484err_set_init:
2f6adf48 4485 kfree(set->name);
65038428 4486err_set_name:
1ff75a3e 4487 kvfree(set);
20a69341
PM		 4488 return err;
4489}
4490
aaa31047
PNA		 4491struct nft_set_elem_catchall {
4492 struct list_head list;
4493 struct rcu_head rcu;
4494 void *elem;
4495};
4496
4497static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4498 struct nft_set *set)
4499{
0f7d9b31 4500 struct nft_set_elem_catchall *next, *catchall;
aaa31047 4501
0f7d9b31 4502 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
aaa31047
PNA		 4503 list_del_rcu(&catchall->list);
4504 nft_set_elem_destroy(set, catchall->elem, true);
ae089831 4505 kfree_rcu(catchall, rcu);
aaa31047
PNA		 4506 }
4507}
4508
0c2a85ed 4509static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
20a69341 4510{
8cfd9b0f
PNA		 4511 int i;
4512
273fe3f1
PNA		 4513 if (WARN_ON(set->use > 0))
4514 return;
4515
8cfd9b0f
PNA		 4516 for (i = 0; i < set->num_exprs; i++)
4517 nft_expr_destroy(ctx, set->exprs[i]);
65038428 4518
20a69341 4519 set->ops->destroy(set);
aaa31047 4520 nft_set_catchall_destroy(ctx, set);
38745490 4521 kfree(set->name);
1ff75a3e 4522 kvfree(set);
20a69341
PM		 4523}
4524
7dab8ee3
PNA		 4525static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4526 const struct nlattr * const nla[])
20a69341 4527{
7dab8ee3
PNA		 4528 struct netlink_ext_ack *extack = info->extack;
4529 u8 genmask = nft_genmask_next(info->net);
67086651 4530 u8 family = info->nfmsg->nfgen_family;
7dab8ee3 4531 struct net *net = info->net;
36dd1bcc 4532 const struct nlattr *attr;
67086651 4533 struct nft_table *table;
20a69341
PM		 4534 struct nft_set *set;
4535 struct nft_ctx ctx;
20a69341 4536
ef4b65e5 4537 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
ec2c9935 4538 return -EAFNOSUPPORT;
20a69341 4539
67086651
PNA		 4540 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4541 genmask, NETLINK_CB(skb).portid);
4542 if (IS_ERR(table)) {
4543 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4544 return PTR_ERR(table);
4545 }
20a69341 4546
36dd1bcc
PNA		 4547 if (nla[NFTA_SET_HANDLE]) {
4548 attr = nla[NFTA_SET_HANDLE];
67086651 4549 set = nft_set_lookup_byhandle(table, attr, genmask);
36dd1bcc
PNA		 4550 } else {
4551 attr = nla[NFTA_SET_NAME];
67086651 4552 set = nft_set_lookup(table, attr, genmask);
36dd1bcc 4553 }
a8278400 4554
36dd1bcc
PNA		 4555 if (IS_ERR(set)) {
4556 NL_SET_BAD_ATTR(extack, attr);
4557 return PTR_ERR(set);
4558 }
273fe3f1 4559 if (set->use ||
7dab8ee3
PNA		 4560 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4561 atomic_read(&set->nelems) > 0)) {
36dd1bcc 4562 NL_SET_BAD_ATTR(extack, attr);
20a69341 4563 return -EBUSY;
36dd1bcc 4564 }
20a69341 4565
67086651
PNA		 4566 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4567
ee01d542 4568 return nft_delset(&ctx, set);
20a69341
PM		 4569}
4570
345023b0
PNA		 4571static int nft_validate_register_store(const struct nft_ctx *ctx,
4572 enum nft_registers reg,
4573 const struct nft_data *data,
4574 enum nft_data_types type,
4575 unsigned int len);
4576
97c976d6
PNA		 4577static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4578 struct nft_set *set,
4579 struct nft_set_elem *elem)
20a69341 4580{
fe2811eb 4581 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 4582 enum nft_registers dreg;
4583
4584 dreg = nft_type_to_reg(set->dtype);
1ec10212
PM		 4585 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4586 set->dtype == NFT_DATA_VERDICT ?
4587 NFT_DATA_VERDICT : NFT_DATA_VALUE,
4588 set->dlen);
20a69341
PM		 4589}
4590
97c976d6
PNA		 4591static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4592 struct nft_set *set,
4593 const struct nft_set_iter *iter,
4594 struct nft_set_elem *elem)
4595{
4596 return nft_setelem_data_validate(ctx, set, elem);
4597}
4598
aaa31047
PNA		 4599static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4600 struct nft_set *set)
4601{
4602 u8 genmask = nft_genmask_next(ctx->net);
4603 struct nft_set_elem_catchall *catchall;
4604 struct nft_set_elem elem;
4605 struct nft_set_ext *ext;
4606 int ret = 0;
4607
4608 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4609 ext = nft_set_elem_ext(set, catchall->elem);
4610 if (!nft_set_elem_active(ext, genmask))
4611 continue;
4612
4613 elem.priv = catchall->elem;
4614 ret = nft_setelem_data_validate(ctx, set, &elem);
4615 if (ret < 0)
4616 break;
4617 }
4618
4619 return ret;
4620}
4621
20a69341
PM		 4622int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4623 struct nft_set_binding *binding)
4624{
4625 struct nft_set_binding *i;
4626 struct nft_set_iter iter;
4627
273fe3f1
PNA		 4628 if (set->use == UINT_MAX)
4629 return -EOVERFLOW;
4630
408070d6 4631 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
20a69341
PM		 4632 return -EBUSY;
4633
11113e19 4634 if (binding->flags & NFT_SET_MAP) {
20a69341
PM		 4635 /* If the set is already bound to the same chain all
4636 * jumps are already validated for that chain.
4637 */
4638 list_for_each_entry(i, &set->bindings, list) {
a4684402 4639 if (i->flags & NFT_SET_MAP &&
11113e19 4640 i->chain == binding->chain)
20a69341
PM		 4641 goto bind;
4642 }
4643
8588ac09 4644 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 4645 iter.skip = 0;
4646 iter.count = 0;
4647 iter.err = 0;
4648 iter.fn = nf_tables_bind_check_setelem;
4649
4650 set->ops->walk(ctx, set, &iter);
aaa31047
PNA		 4651 if (!iter.err)
4652 iter.err = nft_set_catchall_bind_check(ctx, set);
4653
a02f4248 4654 if (iter.err < 0)
20a69341 4655 return iter.err;
20a69341
PM		 4656 }
4657bind:
4658 binding->chain = ctx->chain;
e688a7f8 4659 list_add_tail_rcu(&binding->list, &set->bindings);
f6ac8585 4660 nft_set_trans_bind(ctx, set);
273fe3f1 4661 set->use++;
f6ac8585 4662
20a69341
PM		 4663 return 0;
4664}
63aea290 4665EXPORT_SYMBOL_GPL(nf_tables_bind_set);
20a69341 4666
3b0a081d
FW		 4667static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4668 struct nft_set_binding *binding, bool event)
20a69341 4669{
e688a7f8 4670 list_del_rcu(&binding->list);
20a69341 4671
f6ac8585 4672 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
cd5125d8 4673 list_del_rcu(&set->list);
f6ac8585
PNA		 4674 if (event)
4675 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4676 GFP_KERNEL);
4677 }
20a69341
PM		 4678}
4679
273fe3f1
PNA		 4680void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4681 struct nft_set_binding *binding,
4682 enum nft_trans_phase phase)
4683{
4684 switch (phase) {
4685 case NFT_TRANS_PREPARE:
4686 set->use--;
4687 return;
4688 case NFT_TRANS_ABORT:
4689 case NFT_TRANS_RELEASE:
4690 set->use--;
954d8297 4691 fallthrough;
273fe3f1
PNA		 4692 default:
4693 nf_tables_unbind_set(ctx, set, binding,
4694 phase == NFT_TRANS_COMMIT);
4695 }
4696}
4697EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4698
cd5125d8
FW		 4699void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4700{
f6ac8585 4701 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
0c2a85ed 4702 nft_set_destroy(ctx, set);
cd5125d8
FW		 4703}
4704EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4705
3ac4c07a
PM		 4706const struct nft_set_ext_type nft_set_ext_types[] = {
4707 [NFT_SET_EXT_KEY] = {
7d740264 4708 .align = __alignof__(u32),
3ac4c07a
PM		 4709 },
4710 [NFT_SET_EXT_DATA] = {
7d740264 4711 .align = __alignof__(u32),
3ac4c07a 4712 },
563125a7
PNA		 4713 [NFT_SET_EXT_EXPRESSIONS] = {
4714 .align = __alignof__(struct nft_set_elem_expr),
f25ad2e9 4715 },
8aeff920
PNA		 4716 [NFT_SET_EXT_OBJREF] = {
4717 .len = sizeof(struct nft_object *),
4718 .align = __alignof__(struct nft_object *),
4719 },
3ac4c07a
PM		 4720 [NFT_SET_EXT_FLAGS] = {
4721 .len = sizeof(u8),
4722 .align = __alignof__(u8),
4723 },
c3e1b005
PM		 4724 [NFT_SET_EXT_TIMEOUT] = {
4725 .len = sizeof(u64),
4726 .align = __alignof__(u64),
4727 },
4728 [NFT_SET_EXT_EXPIRATION] = {
8e1102d5
FW		 4729 .len = sizeof(u64),
4730 .align = __alignof__(u64),
c3e1b005 4731 },
68e942e8
PM		 4732 [NFT_SET_EXT_USERDATA] = {
4733 .len = sizeof(struct nft_userdata),
4734 .align = __alignof__(struct nft_userdata),
4735 },
7b225d0b
PNA		 4736 [NFT_SET_EXT_KEY_END] = {
4737 .align = __alignof__(u32),
4738 },
3ac4c07a 4739};
3ac4c07a 4740
20a69341
PM		 4741/*
4742 * Set elements
4743 */
4744
4745static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4746 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
4747 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
4748 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
c3e1b005 4749 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
79ebb5bb 4750 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
68e942e8
PM		 4751 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
4752 .len = NFT_USERDATA_MAXLEN },
467697d2 4753 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
9332d27d
FW		 4754 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
4755 .len = NFT_OBJ_MAXNAMELEN - 1 },
7b225d0b 4756 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
48b0ae04 4757 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
20a69341
PM		 4758};
4759
4760static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
b2fbd044
LZ		 4761 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
4762 .len = NFT_TABLE_MAXNAMELEN - 1 },
4763 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
4764 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341 4765 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
958bee14 4766 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
20a69341
PM		 4767};
4768
563125a7
PNA		 4769static int nft_set_elem_expr_dump(struct sk_buff *skb,
4770 const struct nft_set *set,
4771 const struct nft_set_ext *ext)
4772{
4773 struct nft_set_elem_expr *elem_expr;
4774 u32 size, num_exprs = 0;
4775 struct nft_expr *expr;
48b0ae04 4776 struct nlattr *nest;
563125a7
PNA		 4777
4778 elem_expr = nft_set_ext_expr(ext);
4779 nft_setelem_expr_foreach(expr, elem_expr, size)
4780 num_exprs++;
4781
4782 if (num_exprs == 1) {
4783 expr = nft_setelem_expr_at(elem_expr, 0);
4784 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4785 return -1;
4786
4787 return 0;
48b0ae04
PNA		 4788 } else if (num_exprs > 1) {
4789 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4790 if (nest == NULL)
4791 goto nla_put_failure;
563125a7 4792
48b0ae04
PNA		 4793 nft_setelem_expr_foreach(expr, elem_expr, size) {
4794 expr = nft_setelem_expr_at(elem_expr, size);
4795 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4796 goto nla_put_failure;
4797 }
4798 nla_nest_end(skb, nest);
4799 }
563125a7 4800 return 0;
48b0ae04
PNA		 4801
4802nla_put_failure:
4803 return -1;
563125a7
PNA		 4804}
4805
20a69341
PM		 4806static int nf_tables_fill_setelem(struct sk_buff *skb,
4807 const struct nft_set *set,
4808 const struct nft_set_elem *elem)
4809{
fe2811eb 4810 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 4811 unsigned char *b = skb_tail_pointer(skb);
4812 struct nlattr *nest;
4813
ae0be8de 4814 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
20a69341
PM		 4815 if (nest == NULL)
4816 goto nla_put_failure;
4817
aaa31047
PNA		 4818 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
4819 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
fe2811eb 4820 NFT_DATA_VALUE, set->klen) < 0)
20a69341
PM		 4821 goto nla_put_failure;
4822
7b225d0b
PNA		 4823 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4824 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4825 NFT_DATA_VALUE, set->klen) < 0)
4826 goto nla_put_failure;
4827
fe2811eb
PM		 4828 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4829 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
20a69341
PM		 4830 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4831 set->dlen) < 0)
4832 goto nla_put_failure;
4833
563125a7
PNA		 4834 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4835 nft_set_elem_expr_dump(skb, set, ext))
f25ad2e9
PM		 4836 goto nla_put_failure;
4837
8aeff920
PNA		 4838 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4839 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
d152159b 4840 (*nft_set_ext_obj(ext))->key.name) < 0)
8aeff920
PNA		 4841 goto nla_put_failure;
4842
fe2811eb
PM		 4843 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4844 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4845 htonl(*nft_set_ext_flags(ext))))
4846 goto nla_put_failure;
20a69341 4847
c3e1b005
PM		 4848 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4849 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
8e1102d5 4850 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
b46f6ded 4851 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 4852 goto nla_put_failure;
4853
4854 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
8e1102d5 4855 u64 expires, now = get_jiffies_64();
c3e1b005
PM		 4856
4857 expires = *nft_set_ext_expiration(ext);
8e1102d5 4858 if (time_before64(now, expires))
c3e1b005
PM		 4859 expires -= now;
4860 else
4861 expires = 0;
4862
4863 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
8e1102d5 4864 nf_jiffies64_to_msecs(expires),
b46f6ded 4865 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 4866 goto nla_put_failure;
4867 }
4868
68e942e8
PM		 4869 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4870 struct nft_userdata *udata;
4871
4872 udata = nft_set_ext_userdata(ext);
4873 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4874 udata->len + 1, udata->data))
4875 goto nla_put_failure;
4876 }
4877
20a69341
PM		 4878 nla_nest_end(skb, nest);
4879 return 0;
4880
4881nla_put_failure:
4882 nlmsg_trim(skb, b);
4883 return -EMSGSIZE;
4884}
4885
4886struct nft_set_dump_args {
4887 const struct netlink_callback *cb;
4888 struct nft_set_iter iter;
4889 struct sk_buff *skb;
4890};
4891
4892static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
de70185d 4893 struct nft_set *set,
20a69341 4894 const struct nft_set_iter *iter,
de70185d 4895 struct nft_set_elem *elem)
20a69341
PM		 4896{
4897 struct nft_set_dump_args *args;
4898
4899 args = container_of(iter, struct nft_set_dump_args, iter);
4900 return nf_tables_fill_setelem(args->skb, set, elem);
4901}
4902
fa803605
LZ		 4903struct nft_set_dump_ctx {
4904 const struct nft_set *set;
4905 struct nft_ctx ctx;
4906};
4907
aaa31047
PNA		 4908static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
4909 const struct nft_set *set)
4910{
4911 struct nft_set_elem_catchall *catchall;
4912 u8 genmask = nft_genmask_cur(net);
4913 struct nft_set_elem elem;
4914 struct nft_set_ext *ext;
4915 int ret = 0;
4916
4917 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4918 ext = nft_set_elem_ext(set, catchall->elem);
4919 if (!nft_set_elem_active(ext, genmask) ||
4920 nft_set_elem_expired(ext))
4921 continue;
4922
4923 elem.priv = catchall->elem;
4924 ret = nf_tables_fill_setelem(skb, set, &elem);
4925 break;
4926 }
4927
4928 return ret;
4929}
4930
20a69341
PM		 4931static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4932{
fa803605 4933 struct nft_set_dump_ctx *dump_ctx = cb->data;
633c9a84 4934 struct net *net = sock_net(skb->sk);
0854db2a 4935 struct nftables_pernet *nft_net;
fa803605 4936 struct nft_table *table;
de70185d 4937 struct nft_set *set;
20a69341 4938 struct nft_set_dump_args args;
fa803605 4939 bool set_found = false;
20a69341
PM		 4940 struct nlmsghdr *nlh;
4941 struct nlattr *nest;
4942 u32 portid, seq;
fa803605 4943 int event;
20a69341 4944
fa803605 4945 rcu_read_lock();
d59d2f82 4946 nft_net = nft_pernet(net);
0854db2a 4947 list_for_each_entry_rcu(table, &nft_net->tables, list) {
36596dad 4948 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
98319cb9 4949 dump_ctx->ctx.family != table->family)
fa803605 4950 continue;
20a69341 4951
36596dad
PNA		 4952 if (table != dump_ctx->ctx.table)
4953 continue;
20a69341 4954
36596dad
PNA		 4955 list_for_each_entry_rcu(set, &table->sets, list) {
4956 if (set == dump_ctx->set) {
4957 set_found = true;
4958 break;
fa803605 4959 }
fa803605
LZ		 4960 }
4961 break;
4962 }
4963
4964 if (!set_found) {
4965 rcu_read_unlock();
4966 return -ENOENT;
4967 }
20a69341 4968
dedb67c4 4969 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
20a69341
PM		 4970 portid = NETLINK_CB(cb->skb).portid;
4971 seq = cb->nlh->nlmsg_seq;
4972
19c28b13
PNA		 4973 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
4974 table->family, NFNETLINK_V0, nft_base_seq(net));
4975 if (!nlh)
20a69341
PM		 4976 goto nla_put_failure;
4977
fa803605 4978 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
20a69341
PM		 4979 goto nla_put_failure;
4980 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4981 goto nla_put_failure;
4982
ae0be8de 4983 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
20a69341
PM		 4984 if (nest == NULL)
4985 goto nla_put_failure;
4986
8588ac09
PNA		 4987 args.cb = cb;
4988 args.skb = skb;
fa803605 4989 args.iter.genmask = nft_genmask_cur(net);
8588ac09
PNA		 4990 args.iter.skip = cb->args[0];
4991 args.iter.count = 0;
4992 args.iter.err = 0;
4993 args.iter.fn = nf_tables_dump_setelem;
fa803605 4994 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
aaa31047
PNA		 4995
4996 if (!args.iter.err && args.iter.count == cb->args[0])
4997 args.iter.err = nft_set_catchall_dump(net, skb, set);
fa803605 4998 rcu_read_unlock();
20a69341
PM		 4999
5000 nla_nest_end(skb, nest);
5001 nlmsg_end(skb, nlh);
5002
5003 if (args.iter.err && args.iter.err != -EMSGSIZE)
5004 return args.iter.err;
5005 if (args.iter.count == cb->args[0])
5006 return 0;
5007
5008 cb->args[0] = args.iter.count;
5009 return skb->len;
5010
5011nla_put_failure:
fa803605 5012 rcu_read_unlock();
20a69341
PM		 5013 return -ENOSPC;
5014}
5015
90fd131a
FW		 5016static int nf_tables_dump_set_start(struct netlink_callback *cb)
5017{
5018 struct nft_set_dump_ctx *dump_ctx = cb->data;
5019
5020 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5021
5022 return cb->data ? 0 : -ENOMEM;
5023}
5024
fa803605
LZ		 5025static int nf_tables_dump_set_done(struct netlink_callback *cb)
5026{
5027 kfree(cb->data);
5028 return 0;
5029}
5030
d60ce62f
AB		 5031static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5032 const struct nft_ctx *ctx, u32 seq,
5033 u32 portid, int event, u16 flags,
5034 const struct nft_set *set,
5035 const struct nft_set_elem *elem)
5036{
d60ce62f
AB		 5037 struct nlmsghdr *nlh;
5038 struct nlattr *nest;
5039 int err;
5040
dedb67c4 5041 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
19c28b13
PNA		 5042 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5043 NFNETLINK_V0, nft_base_seq(ctx->net));
5044 if (!nlh)
d60ce62f
AB		 5045 goto nla_put_failure;
5046
d60ce62f
AB		 5047 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5048 goto nla_put_failure;
5049 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5050 goto nla_put_failure;
5051
ae0be8de 5052 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
d60ce62f
AB		 5053 if (nest == NULL)
5054 goto nla_put_failure;
5055
5056 err = nf_tables_fill_setelem(skb, set, elem);
5057 if (err < 0)
5058 goto nla_put_failure;
5059
5060 nla_nest_end(skb, nest);
5061
053c095a
JB		 5062 nlmsg_end(skb, nlh);
5063 return 0;
d60ce62f
AB		 5064
5065nla_put_failure:
5066 nlmsg_trim(skb, nlh);
5067 return -1;
5068}
5069
ba0e4d99
PNA		 5070static int nft_setelem_parse_flags(const struct nft_set *set,
5071 const struct nlattr *attr, u32 *flags)
5072{
5073 if (attr == NULL)
5074 return 0;
5075
5076 *flags = ntohl(nla_get_be32(attr));
aaa31047
PNA		 5077 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5078 return -EOPNOTSUPP;
ba0e4d99
PNA		 5079 if (!(set->flags & NFT_SET_INTERVAL) &&
5080 *flags & NFT_SET_ELEM_INTERVAL_END)
5081 return -EINVAL;
5082
5083 return 0;
5084}
5085
20a1452c
PNA		 5086static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5087 struct nft_data *key, struct nlattr *attr)
5088{
5089 struct nft_data_desc desc;
5090 int err;
5091
5092 err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
5093 if (err < 0)
5094 return err;
5095
5096 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
5097 nft_data_release(key, desc.type);
5098 return -EINVAL;
5099 }
5100
5101 return 0;
5102}
5103
fdb9c405
PNA		 5104static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5105 struct nft_data_desc *desc,
5106 struct nft_data *data,
5107 struct nlattr *attr)
5108{
5109 int err;
5110
5111 err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
5112 if (err < 0)
5113 return err;
5114
5115 if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
5116 nft_data_release(data, desc->type);
5117 return -EINVAL;
5118 }
5119
5120 return 0;
5121}
5122
aaa31047
PNA		 5123static void *nft_setelem_catchall_get(const struct net *net,
5124 const struct nft_set *set)
5125{
5126 struct nft_set_elem_catchall *catchall;
5127 u8 genmask = nft_genmask_cur(net);
5128 struct nft_set_ext *ext;
5129 void *priv = NULL;
5130
5131 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5132 ext = nft_set_elem_ext(set, catchall->elem);
5133 if (!nft_set_elem_active(ext, genmask) ||
5134 nft_set_elem_expired(ext))
5135 continue;
5136
5137 priv = catchall->elem;
5138 break;
5139 }
5140
5141 return priv;
5142}
5143
5144static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5145 struct nft_set_elem *elem, u32 flags)
5146{
5147 void *priv;
5148
5149 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5150 priv = set->ops->get(ctx->net, set, elem, flags);
5151 if (IS_ERR(priv))
5152 return PTR_ERR(priv);
5153 } else {
5154 priv = nft_setelem_catchall_get(ctx->net, set);
5155 if (!priv)
5156 return -ENOENT;
5157 }
5158 elem->priv = priv;
5159
5160 return 0;
5161}
5162
ba0e4d99
PNA		 5163static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5164 const struct nlattr *attr)
5165{
5166 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
ba0e4d99
PNA		 5167 struct nft_set_elem elem;
5168 struct sk_buff *skb;
5169 uint32_t flags = 0;
ba0e4d99
PNA		 5170 int err;
5171
8cb08174
JB		 5172 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5173 nft_set_elem_policy, NULL);
ba0e4d99
PNA		 5174 if (err < 0)
5175 return err;
5176
ba0e4d99
PNA		 5177 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5178 if (err < 0)
5179 return err;
5180
aaa31047
PNA		 5181 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5182 return -EINVAL;
5183
5184 if (nla[NFTA_SET_ELEM_KEY]) {
5185 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5186 nla[NFTA_SET_ELEM_KEY]);
5187 if (err < 0)
5188 return err;
5189 }
ba0e4d99 5190
7b225d0b
PNA		 5191 if (nla[NFTA_SET_ELEM_KEY_END]) {
5192 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5193 nla[NFTA_SET_ELEM_KEY_END]);
5194 if (err < 0)
5195 return err;
5196 }
5197
aaa31047
PNA		 5198 err = nft_setelem_get(ctx, set, &elem, flags);
5199 if (err < 0)
5200 return err;
ba0e4d99
PNA		 5201
5202 err = -ENOMEM;
d9adf22a 5203 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
ba0e4d99 5204 if (skb == NULL)
ee921183 5205 return err;
ba0e4d99
PNA		 5206
5207 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5208 NFT_MSG_NEWSETELEM, 0, set, &elem);
5209 if (err < 0)
ee921183 5210 goto err_fill_setelem;
ba0e4d99 5211
ee921183 5212 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
ba0e4d99 5213
ee921183 5214err_fill_setelem:
ba0e4d99 5215 kfree_skb(skb);
ee921183 5216 return err;
ba0e4d99
PNA		 5217}
5218
d9adf22a 5219/* called with rcu_read_lock held */
797d4980
PNA		 5220static int nf_tables_getsetelem(struct sk_buff *skb,
5221 const struct nfnl_info *info,
5222 const struct nlattr * const nla[])
ba0e4d99 5223{
797d4980
PNA		 5224 struct netlink_ext_ack *extack = info->extack;
5225 u8 genmask = nft_genmask_cur(info->net);
e2b750d7 5226 u8 family = info->nfmsg->nfgen_family;
797d4980 5227 struct net *net = info->net;
e2b750d7 5228 struct nft_table *table;
ba0e4d99
PNA		 5229 struct nft_set *set;
5230 struct nlattr *attr;
5231 struct nft_ctx ctx;
5232 int rem, err = 0;
5233
e2b750d7
PNA		 5234 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5235 genmask, NETLINK_CB(skb).portid);
5236 if (IS_ERR(table)) {
5237 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5238 return PTR_ERR(table);
5239 }
ba0e4d99 5240
e2b750d7 5241 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
ba0e4d99
PNA		 5242 if (IS_ERR(set))
5243 return PTR_ERR(set);
5244
e2b750d7
PNA		 5245 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5246
797d4980 5247 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
ba0e4d99 5248 struct netlink_dump_control c = {
90fd131a 5249 .start = nf_tables_dump_set_start,
ba0e4d99
PNA		 5250 .dump = nf_tables_dump_set,
5251 .done = nf_tables_dump_set_done,
d9adf22a 5252 .module = THIS_MODULE,
ba0e4d99 5253 };
90fd131a
FW		 5254 struct nft_set_dump_ctx dump_ctx = {
5255 .set = set,
5256 .ctx = ctx,
5257 };
ba0e4d99 5258
90fd131a 5259 c.data = &dump_ctx;
797d4980 5260 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
ba0e4d99
PNA		 5261 }
5262
5263 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5264 return -EINVAL;
5265
5266 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5267 err = nft_get_set_elem(&ctx, set, attr);
5268 if (err < 0)
5269 break;
5270 }
5271
5272 return err;
5273}
5274
25e94a99
PNA		 5275static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5276 const struct nft_set *set,
5277 const struct nft_set_elem *elem,
6fb721cf 5278 int event)
d60ce62f 5279{
0854db2a 5280 struct nftables_pernet *nft_net;
128ad332
PNA		 5281 struct net *net = ctx->net;
5282 u32 portid = ctx->portid;
d60ce62f 5283 struct sk_buff *skb;
6fb721cf 5284 u16 flags = 0;
d60ce62f
AB		 5285 int err;
5286
128ad332 5287 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 5288 return;
d60ce62f 5289
d60ce62f
AB		 5290 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5291 if (skb == NULL)
5292 goto err;
5293
6fb721cf
PNA		 5294 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5295 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5296
d60ce62f
AB		 5297 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5298 set, elem);
5299 if (err < 0) {
5300 kfree_skb(skb);
5301 goto err;
5302 }
5303
d59d2f82 5304 nft_net = nft_pernet(net);
0854db2a 5305 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
25e94a99 5306 return;
d60ce62f 5307err:
25e94a99 5308 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
d60ce62f
AB		 5309}
5310
60319eb1
PNA		 5311static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5312 int msg_type,
5313 struct nft_set *set)
5314{
5315 struct nft_trans *trans;
5316
5317 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5318 if (trans == NULL)
5319 return NULL;
5320
5321 nft_trans_elem_set(trans) = set;
5322 return trans;
5323}
5324
a7fc9368
PNA		 5325struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5326 const struct nft_set *set,
5327 const struct nlattr *attr)
5328{
5329 struct nft_expr *expr;
5330 int err;
5331
5332 expr = nft_expr_init(ctx, attr);
5333 if (IS_ERR(expr))
5334 return expr;
5335
5336 err = -EOPNOTSUPP;
5337 if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL))
5338 goto err_set_elem_expr;
5339
5340 if (expr->ops->type->flags & NFT_EXPR_GC) {
5341 if (set->flags & NFT_SET_TIMEOUT)
5342 goto err_set_elem_expr;
5343 if (!set->ops->gc_init)
5344 goto err_set_elem_expr;
5345 set->ops->gc_init(set);
5346 }
5347
5348 return expr;
5349
5350err_set_elem_expr:
5351 nft_expr_destroy(ctx, expr);
5352 return ERR_PTR(err);
5353}
5354
22fe54d5
PM		 5355void *nft_set_elem_init(const struct nft_set *set,
5356 const struct nft_set_ext_tmpl *tmpl,
7b225d0b
PNA		 5357 const u32 *key, const u32 *key_end,
5358 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
fe2811eb
PM		 5359{
5360 struct nft_set_ext *ext;
5361 void *elem;
5362
5363 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5364 if (elem == NULL)
5365 return NULL;
5366
5367 ext = nft_set_elem_ext(set, elem);
5368 nft_set_ext_init(ext, tmpl);
5369
aaa31047
PNA		 5370 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY))
5371 memcpy(nft_set_ext_key(ext), key, set->klen);
7b225d0b
PNA		 5372 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5373 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
fe2811eb
PM		 5374 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5375 memcpy(nft_set_ext_data(ext), data, set->dlen);
79ebb5bb
LGL		 5376 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5377 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5378 if (expiration == 0)
5379 *nft_set_ext_expiration(ext) += timeout;
5380 }
c3e1b005
PM		 5381 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5382 *nft_set_ext_timeout(ext) = timeout;
fe2811eb
PM		 5383
5384 return elem;
5385}
5386
563125a7
PNA		 5387static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5388 struct nft_expr *expr)
475beb9c
PNA		 5389{
5390 if (expr->ops->destroy_clone) {
5391 expr->ops->destroy_clone(ctx, expr);
5392 module_put(expr->ops->type->owner);
5393 } else {
5394 nf_tables_expr_destroy(ctx, expr);
5395 }
5396}
5397
563125a7
PNA		 5398static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5399 struct nft_set_elem_expr *elem_expr)
5400{
5401 struct nft_expr *expr;
5402 u32 size;
5403
5404 nft_setelem_expr_foreach(expr, elem_expr, size)
5405 __nft_set_elem_expr_destroy(ctx, expr);
5406}
5407
61f9e292
LZ		 5408void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5409 bool destroy_expr)
61edafbb
PM		 5410{
5411 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3453c927
PNA		 5412 struct nft_ctx ctx = {
5413 .net = read_pnet(&set->net),
5414 .family = set->table->family,
5415 };
61edafbb 5416
59105446 5417 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
61edafbb 5418 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
59105446 5419 nft_data_release(nft_set_ext_data(ext), set->dtype);
563125a7 5420 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
475beb9c 5421 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
371ebcbb 5422
8aeff920
PNA		 5423 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5424 (*nft_set_ext_obj(ext))->use--;
61edafbb
PM		 5425 kfree(elem);
5426}
5427EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5428
f8bb7889
PNA		 5429/* Only called from commit path, nft_setelem_data_deactivate() already deals
5430 * with the refcounting from the preparation phase.
59105446 5431 */
3453c927
PNA		 5432static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5433 const struct nft_set *set, void *elem)
59105446
PNA		 5434{
5435 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5436
563125a7 5437 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
475beb9c
PNA		 5438 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5439
59105446
PNA		 5440 kfree(elem);
5441}
5442
fca05d4d
PNA		 5443int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5444 struct nft_expr *expr_array[])
8cfd9b0f
PNA		 5445{
5446 struct nft_expr *expr;
5447 int err, i, k;
5448
5449 for (i = 0; i < set->num_exprs; i++) {
5450 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL);
5451 if (!expr)
5452 goto err_expr;
5453
5454 err = nft_expr_clone(expr, set->exprs[i]);
5455 if (err < 0) {
5456 nft_expr_destroy(ctx, expr);
5457 goto err_expr;
5458 }
5459 expr_array[i] = expr;
5460 }
5461
5462 return 0;
5463
5464err_expr:
161b838e
CIK		 5465 for (k = i - 1; k >= 0; k--)
5466 nft_expr_destroy(ctx, expr_array[k]);
8cfd9b0f
PNA		 5467
5468 return -ENOMEM;
5469}
5470
4d8f9065
PNA		 5471static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5472 const struct nft_set_ext *ext,
5473 struct nft_expr *expr_array[],
5474 u32 num_exprs)
563125a7
PNA		 5475{
5476 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
4d8f9065
PNA		 5477 struct nft_expr *expr;
5478 int i, err;
5479
5480 for (i = 0; i < num_exprs; i++) {
5481 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5482 err = nft_expr_clone(expr, expr_array[i]);
5483 if (err < 0)
5484 goto err_elem_expr_setup;
5485
5486 elem_expr->size += expr_array[i]->ops->size;
5487 nft_expr_destroy(ctx, expr_array[i]);
5488 expr_array[i] = NULL;
5489 }
5490
5491 return 0;
5492
5493err_elem_expr_setup:
5494 for (; i < num_exprs; i++) {
5495 nft_expr_destroy(ctx, expr_array[i]);
5496 expr_array[i] = NULL;
5497 }
563125a7 5498
4d8f9065 5499 return -ENOMEM;
563125a7
PNA		 5500}
5501
aaa31047
PNA		 5502struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5503 const struct nft_set *set)
5504{
5505 struct nft_set_elem_catchall *catchall;
5506 u8 genmask = nft_genmask_cur(net);
5507 struct nft_set_ext *ext;
5508
5509 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5510 ext = nft_set_elem_ext(set, catchall->elem);
5511 if (nft_set_elem_active(ext, genmask) &&
5512 !nft_set_elem_expired(ext))
5513 return ext;
5514 }
5515
5516 return NULL;
5517}
5518EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5519
5520void *nft_set_catchall_gc(const struct nft_set *set)
5521{
5522 struct nft_set_elem_catchall *catchall, *next;
5523 struct nft_set_ext *ext;
5524 void *elem = NULL;
5525
5526 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5527 ext = nft_set_elem_ext(set, catchall->elem);
5528
5529 if (!nft_set_elem_expired(ext) ||
5530 nft_set_elem_mark_busy(ext))
5531 continue;
5532
5533 elem = catchall->elem;
5534 list_del_rcu(&catchall->list);
5535 kfree_rcu(catchall, rcu);
5536 break;
5537 }
5538
5539 return elem;
5540}
5541EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5542
5543static int nft_setelem_catchall_insert(const struct net *net,
5544 struct nft_set *set,
5545 const struct nft_set_elem *elem,
5546 struct nft_set_ext **pext)
5547{
5548 struct nft_set_elem_catchall *catchall;
5549 u8 genmask = nft_genmask_next(net);
5550 struct nft_set_ext *ext;
5551
5552 list_for_each_entry(catchall, &set->catchall_list, list) {
5553 ext = nft_set_elem_ext(set, catchall->elem);
5554 if (nft_set_elem_active(ext, genmask)) {
5555 *pext = ext;
5556 return -EEXIST;
5557 }
5558 }
5559
5560 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5561 if (!catchall)
5562 return -ENOMEM;
5563
5564 catchall->elem = elem->priv;
5565 list_add_tail_rcu(&catchall->list, &set->catchall_list);
5566
5567 return 0;
5568}
5569
5570static int nft_setelem_insert(const struct net *net,
5571 struct nft_set *set,
5572 const struct nft_set_elem *elem,
5573 struct nft_set_ext **ext, unsigned int flags)
5574{
5575 int ret;
5576
5577 if (flags & NFT_SET_ELEM_CATCHALL)
5578 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5579 else
5580 ret = set->ops->insert(net, set, elem, ext);
5581
5582 return ret;
5583}
5584
5585static bool nft_setelem_is_catchall(const struct nft_set *set,
5586 const struct nft_set_elem *elem)
5587{
5588 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5589
5590 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5591 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5592 return true;
5593
5594 return false;
5595}
5596
5597static void nft_setelem_activate(struct net *net, struct nft_set *set,
5598 struct nft_set_elem *elem)
5599{
5600 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5601
5602 if (nft_setelem_is_catchall(set, elem)) {
5603 nft_set_elem_change_active(net, set, ext);
5604 nft_set_elem_clear_busy(ext);
5605 } else {
5606 set->ops->activate(net, set, elem);
5607 }
5608}
5609
5610static int nft_setelem_catchall_deactivate(const struct net *net,
5611 struct nft_set *set,
5612 struct nft_set_elem *elem)
5613{
5614 struct nft_set_elem_catchall *catchall;
5615 struct nft_set_ext *ext;
5616
5617 list_for_each_entry(catchall, &set->catchall_list, list) {
5618 ext = nft_set_elem_ext(set, catchall->elem);
5619 if (!nft_is_active(net, ext) ||
5620 nft_set_elem_mark_busy(ext))
5621 continue;
5622
5623 kfree(elem->priv);
5624 elem->priv = catchall->elem;
5625 nft_set_elem_change_active(net, set, ext);
5626 return 0;
5627 }
5628
5629 return -ENOENT;
5630}
5631
5632static int __nft_setelem_deactivate(const struct net *net,
5633 struct nft_set *set,
5634 struct nft_set_elem *elem)
5635{
5636 void *priv;
5637
5638 priv = set->ops->deactivate(net, set, elem);
5639 if (!priv)
5640 return -ENOENT;
5641
5642 kfree(elem->priv);
5643 elem->priv = priv;
5644 set->ndeact++;
5645
5646 return 0;
5647}
5648
5649static int nft_setelem_deactivate(const struct net *net,
5650 struct nft_set *set,
5651 struct nft_set_elem *elem, u32 flags)
5652{
5653 int ret;
5654
5655 if (flags & NFT_SET_ELEM_CATCHALL)
5656 ret = nft_setelem_catchall_deactivate(net, set, elem);
5657 else
5658 ret = __nft_setelem_deactivate(net, set, elem);
5659
5660 return ret;
5661}
5662
5663static void nft_setelem_catchall_remove(const struct net *net,
5664 const struct nft_set *set,
5665 const struct nft_set_elem *elem)
5666{
5667 struct nft_set_elem_catchall *catchall, *next;
5668
5669 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5670 if (catchall->elem == elem->priv) {
5671 list_del_rcu(&catchall->list);
ae089831 5672 kfree_rcu(catchall, rcu);
aaa31047
PNA		 5673 break;
5674 }
5675 }
5676}
5677
5678static void nft_setelem_remove(const struct net *net,
5679 const struct nft_set *set,
5680 const struct nft_set_elem *elem)
5681{
5682 if (nft_setelem_is_catchall(set, elem))
5683 nft_setelem_catchall_remove(net, set, elem);
5684 else
5685 set->ops->remove(net, set, elem);
5686}
5687
60319eb1 5688static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
c016c7e4 5689 const struct nlattr *attr, u32 nlmsg_flags)
20a69341 5690{
8cfd9b0f 5691 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
20a69341 5692 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
8aeff920 5693 u8 genmask = nft_genmask_next(ctx->net);
664899e8 5694 u32 flags = 0, size = 0, num_exprs = 0;
fe2811eb 5695 struct nft_set_ext_tmpl tmpl;
c016c7e4 5696 struct nft_set_ext *ext, *ext2;
20a69341
PM		 5697 struct nft_set_elem elem;
5698 struct nft_set_binding *binding;
8aeff920 5699 struct nft_object *obj = NULL;
68e942e8 5700 struct nft_userdata *udata;
20a1452c 5701 struct nft_data_desc desc;
20a69341 5702 enum nft_registers dreg;
60319eb1 5703 struct nft_trans *trans;
c3e1b005 5704 u64 timeout;
79ebb5bb 5705 u64 expiration;
8cfd9b0f 5706 int err, i;
68e942e8 5707 u8 ulen;
20a69341 5708
8cb08174
JB		 5709 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5710 nft_set_elem_policy, NULL);
20a69341
PM		 5711 if (err < 0)
5712 return err;
5713
fe2811eb
PM		 5714 nft_set_ext_prepare(&tmpl);
5715
0e9091d6
PNA		 5716 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5717 if (err < 0)
5718 return err;
aaa31047
PNA		 5719
5720 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5721 return -EINVAL;
5722
0e9091d6
PNA		 5723 if (flags != 0)
5724 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
20a69341
PM		 5725
5726 if (set->flags & NFT_SET_MAP) {
5727 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
fe2811eb 5728 !(flags & NFT_SET_ELEM_INTERVAL_END))
20a69341
PM		 5729 return -EINVAL;
5730 } else {
5731 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5732 return -EINVAL;
5733 }
5734
bffc124b
PNA		 5735 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5736 (nla[NFTA_SET_ELEM_DATA] ||
5737 nla[NFTA_SET_ELEM_OBJREF] ||
5738 nla[NFTA_SET_ELEM_TIMEOUT] ||
5739 nla[NFTA_SET_ELEM_EXPIRATION] ||
5740 nla[NFTA_SET_ELEM_USERDATA] ||
48b0ae04
PNA		 5741 nla[NFTA_SET_ELEM_EXPR] ||
5742 nla[NFTA_SET_ELEM_EXPRESSIONS]))
bffc124b
PNA		 5743 return -EINVAL;
5744
c3e1b005
PM		 5745 timeout = 0;
5746 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5747 if (!(set->flags & NFT_SET_TIMEOUT))
5748 return -EINVAL;
8e1102d5
FW		 5749 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5750 &timeout);
5751 if (err)
5752 return err;
c3e1b005
PM		 5753 } else if (set->flags & NFT_SET_TIMEOUT) {
5754 timeout = set->timeout;
5755 }
5756
79ebb5bb
LGL		 5757 expiration = 0;
5758 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5759 if (!(set->flags & NFT_SET_TIMEOUT))
5760 return -EINVAL;
5761 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5762 &expiration);
5763 if (err)
5764 return err;
5765 }
5766
8cfd9b0f
PNA		 5767 if (nla[NFTA_SET_ELEM_EXPR]) {
5768 struct nft_expr *expr;
5769
664899e8 5770 if (set->num_exprs && set->num_exprs != 1)
8cfd9b0f
PNA		 5771 return -EOPNOTSUPP;
5772
40944452
PNA		 5773 expr = nft_set_elem_expr_alloc(ctx, set,
5774 nla[NFTA_SET_ELEM_EXPR]);
5775 if (IS_ERR(expr))
5776 return PTR_ERR(expr);
65038428 5777
8cfd9b0f 5778 expr_array[0] = expr;
664899e8 5779 num_exprs = 1;
65038428 5780
664899e8 5781 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
8cfd9b0f 5782 err = -EOPNOTSUPP;
65038428 5783 goto err_set_elem_expr;
8cfd9b0f 5784 }
48b0ae04
PNA		 5785 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5786 struct nft_expr *expr;
5787 struct nlattr *tmp;
5788 int left;
65038428 5789
48b0ae04
PNA		 5790 i = 0;
5791 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
664899e8
PNA		 5792 if (i == NFT_SET_EXPR_MAX ||
5793 (set->num_exprs && set->num_exprs == i)) {
48b0ae04
PNA		 5794 err = -E2BIG;
5795 goto err_set_elem_expr;
5796 }
5797 if (nla_type(tmp) != NFTA_LIST_ELEM) {
5798 err = -EINVAL;
5799 goto err_set_elem_expr;
5800 }
5801 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5802 if (IS_ERR(expr)) {
5803 err = PTR_ERR(expr);
5804 goto err_set_elem_expr;
5805 }
5806 expr_array[i] = expr;
664899e8 5807 num_exprs++;
48b0ae04 5808
664899e8 5809 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
48b0ae04
PNA		 5810 err = -EOPNOTSUPP;
5811 goto err_set_elem_expr;
5812 }
5813 i++;
5814 }
664899e8 5815 if (set->num_exprs && set->num_exprs != i) {
48b0ae04 5816 err = -EOPNOTSUPP;
65038428 5817 goto err_set_elem_expr;
48b0ae04 5818 }
8cfd9b0f
PNA		 5819 } else if (set->num_exprs > 0) {
5820 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5821 if (err < 0)
5822 goto err_set_elem_expr_clone;
664899e8
PNA		 5823
5824 num_exprs = set->num_exprs;
40944452
PNA		 5825 }
5826
aaa31047
PNA		 5827 if (nla[NFTA_SET_ELEM_KEY]) {
5828 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5829 nla[NFTA_SET_ELEM_KEY]);
5830 if (err < 0)
5831 goto err_set_elem_expr;
20a69341 5832
aaa31047
PNA		 5833 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5834 }
7b225d0b
PNA		 5835
5836 if (nla[NFTA_SET_ELEM_KEY_END]) {
5837 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5838 nla[NFTA_SET_ELEM_KEY_END]);
5839 if (err < 0)
5840 goto err_parse_key;
5841
5842 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5843 }
5844
c3e1b005
PM		 5845 if (timeout > 0) {
5846 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5847 if (timeout != set->timeout)
5848 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5849 }
fe2811eb 5850
664899e8
PNA		 5851 if (num_exprs) {
5852 for (i = 0; i < num_exprs; i++)
563125a7
PNA		 5853 size += expr_array[i]->ops->size;
5854
5855 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
5856 sizeof(struct nft_set_elem_expr) +
5857 size);
5858 }
40944452 5859
8aeff920
PNA		 5860 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5861 if (!(set->flags & NFT_SET_OBJECT)) {
5862 err = -EINVAL;
7b225d0b 5863 goto err_parse_key_end;
8aeff920 5864 }
4d44175a
FW		 5865 obj = nft_obj_lookup(ctx->net, ctx->table,
5866 nla[NFTA_SET_ELEM_OBJREF],
cac20fcd 5867 set->objtype, genmask);
8aeff920
PNA		 5868 if (IS_ERR(obj)) {
5869 err = PTR_ERR(obj);
7b225d0b 5870 goto err_parse_key_end;
8aeff920
PNA		 5871 }
5872 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5873 }
5874
20a69341 5875 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
fdb9c405
PNA		 5876 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5877 nla[NFTA_SET_ELEM_DATA]);
20a69341 5878 if (err < 0)
7b225d0b 5879 goto err_parse_key_end;
20a69341 5880
20a69341
PM		 5881 dreg = nft_type_to_reg(set->dtype);
5882 list_for_each_entry(binding, &set->bindings, list) {
5883 struct nft_ctx bind_ctx = {
58c78e10 5884 .net = ctx->net,
36596dad 5885 .family = ctx->family,
20a69341 5886 .table = ctx->table,
7c95f6d8 5887 .chain = (struct nft_chain *)binding->chain,
20a69341
PM		 5888 };
5889
11113e19
PM		 5890 if (!(binding->flags & NFT_SET_MAP))
5891 continue;
5892
1ec10212 5893 err = nft_validate_register_store(&bind_ctx, dreg,
fdb9c405 5894 &elem.data.val,
20a1452c 5895 desc.type, desc.len);
20a69341 5896 if (err < 0)
7b225d0b 5897 goto err_parse_data;
a654de8f 5898
20a1452c 5899 if (desc.type == NFT_DATA_VERDICT &&
fdb9c405
PNA		 5900 (elem.data.val.verdict.code == NFT_GOTO ||
5901 elem.data.val.verdict.code == NFT_JUMP))
a654de8f
PNA		 5902 nft_validate_state_update(ctx->net,
5903 NFT_VALIDATE_NEED);
20a69341 5904 }
fe2811eb 5905
20a1452c 5906 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
20a69341
PM		 5907 }
5908
68e942e8
PM		 5909 /* The full maximum length of userdata can exceed the maximum
5910 * offset value (U8_MAX) for following extensions, therefor it
5911 * must be the last extension added.
5912 */
5913 ulen = 0;
5914 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5915 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5916 if (ulen > 0)
5917 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5918 ulen);
5919 }
5920
fe2811eb 5921 err = -ENOMEM;
7b225d0b 5922 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
fdb9c405 5923 elem.key_end.val.data, elem.data.val.data,
79ebb5bb 5924 timeout, expiration, GFP_KERNEL);
fe2811eb 5925 if (elem.priv == NULL)
7b225d0b 5926 goto err_parse_data;
fe2811eb
PM		 5927
5928 ext = nft_set_elem_ext(set, elem.priv);
5929 if (flags)
5930 *nft_set_ext_flags(ext) = flags;
68e942e8
PM		 5931 if (ulen > 0) {
5932 udata = nft_set_ext_userdata(ext);
5933 udata->len = ulen - 1;
5934 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5935 }
8aeff920
PNA		 5936 if (obj) {
5937 *nft_set_ext_obj(ext) = obj;
5938 obj->use++;
5939 }
4d8f9065
PNA		 5940 err = nft_set_elem_expr_setup(ctx, ext, expr_array, num_exprs);
5941 if (err < 0)
5942 goto err_elem_expr;
fe2811eb 5943
60319eb1 5944 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
4d8f9065
PNA		 5945 if (trans == NULL) {
5946 err = -ENOMEM;
5947 goto err_elem_expr;
5948 }
60319eb1 5949
69086658 5950 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
aaa31047
PNA		 5951
5952 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
c016c7e4
PNA		 5953 if (err) {
5954 if (err == -EEXIST) {
9744a6fc
PNA		 5955 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5956 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5957 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
77a92189 5958 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
7b225d0b 5959 goto err_element_clash;
8aeff920
PNA		 5960 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5961 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5962 memcmp(nft_set_ext_data(ext),
5963 nft_set_ext_data(ext2), set->dlen) != 0) ||
5964 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5965 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5966 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
77a92189 5967 goto err_element_clash;
c016c7e4
PNA		 5968 else if (!(nlmsg_flags & NLM_F_EXCL))
5969 err = 0;
8c2d45b2
PNA		 5970 } else if (err == -ENOTEMPTY) {
5971 /* ENOTEMPTY reports overlapping between this element
5972 * and an existing one.
5973 */
5974 err = -EEXIST;
c016c7e4 5975 }
7b225d0b 5976 goto err_element_clash;
c016c7e4 5977 }
20a69341 5978
aaa31047 5979 if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
35d0ac90
PNA		 5980 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5981 err = -ENFILE;
7b225d0b 5982 goto err_set_full;
35d0ac90
PNA		 5983 }
5984
60319eb1 5985 nft_trans_elem(trans) = elem;
0854db2a 5986 nft_trans_commit_list_add_tail(ctx->net, trans);
20a69341
PM		 5987 return 0;
5988
7b225d0b 5989err_set_full:
aaa31047 5990 nft_setelem_remove(ctx->net, set, &elem);
7b225d0b 5991err_element_clash:
60319eb1 5992 kfree(trans);
4d8f9065 5993err_elem_expr:
b91d9036
TY		 5994 if (obj)
5995 obj->use--;
475beb9c
PNA		 5996
5997 nf_tables_set_elem_destroy(ctx, set, elem.priv);
7b225d0b 5998err_parse_data:
20a69341 5999 if (nla[NFTA_SET_ELEM_DATA] != NULL)
fdb9c405 6000 nft_data_release(&elem.data.val, desc.type);
7b225d0b
PNA		 6001err_parse_key_end:
6002 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6003err_parse_key:
20a1452c 6004 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
40944452 6005err_set_elem_expr:
664899e8 6006 for (i = 0; i < num_exprs && expr_array[i]; i++)
8cfd9b0f
PNA		 6007 nft_expr_destroy(ctx, expr_array[i]);
6008err_set_elem_expr_clone:
20a69341
PM		 6009 return err;
6010}
6011
7dab8ee3
PNA		 6012static int nf_tables_newsetelem(struct sk_buff *skb,
6013 const struct nfnl_info *info,
6014 const struct nlattr * const nla[])
20a69341 6015{
7dab8ee3
PNA		 6016 struct nftables_pernet *nft_net = nft_pernet(info->net);
6017 struct netlink_ext_ack *extack = info->extack;
6018 u8 genmask = nft_genmask_next(info->net);
e2b750d7 6019 u8 family = info->nfmsg->nfgen_family;
7dab8ee3 6020 struct net *net = info->net;
20a69341 6021 const struct nlattr *attr;
e2b750d7 6022 struct nft_table *table;
20a69341
PM		 6023 struct nft_set *set;
6024 struct nft_ctx ctx;
a654de8f 6025 int rem, err;
20a69341 6026
7d5570ca
PNA		 6027 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6028 return -EINVAL;
6029
e2b750d7
PNA		 6030 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6031 genmask, NETLINK_CB(skb).portid);
6032 if (IS_ERR(table)) {
6033 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6034 return PTR_ERR(table);
6035 }
20a69341 6036
e2b750d7 6037 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
a3073c17
PNA		 6038 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6039 if (IS_ERR(set))
6040 return PTR_ERR(set);
958bee14 6041
20a69341
PM		 6042 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6043 return -EBUSY;
6044
e2b750d7
PNA		 6045 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6046
20a69341 6047 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7dab8ee3 6048 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
35d0ac90 6049 if (err < 0)
a654de8f 6050 return err;
20a69341 6051 }
a654de8f 6052
0854db2a 6053 if (nft_net->validate_state == NFT_VALIDATE_DO)
e2b750d7 6054 return nft_table_validate(net, table);
a654de8f
PNA		 6055
6056 return 0;
20a69341
PM		 6057}
6058
59105446
PNA		 6059/**
6060 * nft_data_hold - hold a nft_data item
6061 *
6062 * @data: struct nft_data to release
6063 * @type: type of data
6064 *
6065 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6066 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6067 * NFT_GOTO verdicts. This function must be called on active data objects
6068 * from the second phase of the commit protocol.
6069 */
bb7b40ae 6070void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
59105446 6071{
d0e2c7de
PNA		 6072 struct nft_chain *chain;
6073 struct nft_rule *rule;
6074
59105446
PNA		 6075 if (type == NFT_DATA_VERDICT) {
6076 switch (data->verdict.code) {
6077 case NFT_JUMP:
6078 case NFT_GOTO:
d0e2c7de
PNA		 6079 chain = data->verdict.chain;
6080 chain->use++;
6081
6082 if (!nft_chain_is_bound(chain))
6083 break;
6084
6085 chain->table->use++;
6086 list_for_each_entry(rule, &chain->rules, list)
6087 chain->use++;
6088
6089 nft_chain_add(chain->table, chain);
59105446
PNA		 6090 break;
6091 }
6092 }
6093}
6094
f8bb7889
PNA		 6095static void nft_setelem_data_activate(const struct net *net,
6096 const struct nft_set *set,
6097 struct nft_set_elem *elem)
59105446
PNA		 6098{
6099 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6100
6101 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6102 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6103 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6104 (*nft_set_ext_obj(ext))->use++;
6105}
6106
f8bb7889
PNA		 6107static void nft_setelem_data_deactivate(const struct net *net,
6108 const struct nft_set *set,
6109 struct nft_set_elem *elem)
59105446
PNA		 6110{
6111 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6112
6113 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6114 nft_data_release(nft_set_ext_data(ext), set->dtype);
6115 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6116 (*nft_set_ext_obj(ext))->use--;
6117}
6118
60319eb1 6119static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 6120 const struct nlattr *attr)
6121{
6122 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3971ca14 6123 struct nft_set_ext_tmpl tmpl;
20a69341 6124 struct nft_set_elem elem;
3971ca14 6125 struct nft_set_ext *ext;
60319eb1 6126 struct nft_trans *trans;
3971ca14 6127 u32 flags = 0;
20a69341
PM		 6128 int err;
6129
8cb08174
JB		 6130 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6131 nft_set_elem_policy, NULL);
20a69341 6132 if (err < 0)
20a1452c 6133 return err;
20a69341 6134
aaa31047
PNA		 6135 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6136 if (err < 0)
6137 return err;
6138
6139 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
20a1452c 6140 return -EINVAL;
20a69341 6141
3971ca14
PNA		 6142 nft_set_ext_prepare(&tmpl);
6143
3971ca14
PNA		 6144 if (flags != 0)
6145 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6146
aaa31047
PNA		 6147 if (nla[NFTA_SET_ELEM_KEY]) {
6148 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6149 nla[NFTA_SET_ELEM_KEY]);
6150 if (err < 0)
6151 return err;
20a69341 6152
aaa31047
PNA		 6153 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6154 }
3971ca14 6155
7b225d0b
PNA		 6156 if (nla[NFTA_SET_ELEM_KEY_END]) {
6157 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6158 nla[NFTA_SET_ELEM_KEY_END]);
6159 if (err < 0)
6160 return err;
6161
6162 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6163 }
6164
3971ca14 6165 err = -ENOMEM;
7b225d0b
PNA		 6166 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6167 elem.key_end.val.data, NULL, 0, 0,
6168 GFP_KERNEL);
3971ca14 6169 if (elem.priv == NULL)
20a1452c 6170 goto fail_elem;
3971ca14
PNA		 6171
6172 ext = nft_set_elem_ext(set, elem.priv);
6173 if (flags)
6174 *nft_set_ext_flags(ext) = flags;
6175
60319eb1 6176 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
20a1452c
PNA		 6177 if (trans == NULL)
6178 goto fail_trans;
20a69341 6179
aaa31047
PNA		 6180 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6181 if (err < 0)
20a1452c 6182 goto fail_ops;
cc02e457 6183
f8bb7889 6184 nft_setelem_data_deactivate(ctx->net, set, &elem);
59105446 6185
60319eb1 6186 nft_trans_elem(trans) = elem;
0854db2a 6187 nft_trans_commit_list_add_tail(ctx->net, trans);
0dc13625 6188 return 0;
cc02e457 6189
20a1452c 6190fail_ops:
cc02e457 6191 kfree(trans);
20a1452c 6192fail_trans:
3971ca14 6193 kfree(elem.priv);
20a1452c
PNA		 6194fail_elem:
6195 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
20a69341
PM		 6196 return err;
6197}
6198
e6ba7cb6
PNA		 6199static int nft_setelem_flush(const struct nft_ctx *ctx,
6200 struct nft_set *set,
6201 const struct nft_set_iter *iter,
6202 struct nft_set_elem *elem)
8411b644
PNA		 6203{
6204 struct nft_trans *trans;
6205 int err;
6206
6207 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6208 sizeof(struct nft_trans_elem), GFP_ATOMIC);
6209 if (!trans)
6210 return -ENOMEM;
6211
1ba1c414 6212 if (!set->ops->flush(ctx->net, set, elem->priv)) {
8411b644
PNA		 6213 err = -ENOENT;
6214 goto err1;
6215 }
b2c11e4b 6216 set->ndeact++;
8411b644 6217
f8bb7889 6218 nft_setelem_data_deactivate(ctx->net, set, elem);
de70185d
PNA		 6219 nft_trans_elem_set(trans) = set;
6220 nft_trans_elem(trans) = *elem;
0854db2a 6221 nft_trans_commit_list_add_tail(ctx->net, trans);
8411b644
PNA		 6222
6223 return 0;
6224err1:
6225 kfree(trans);
6226 return err;
6227}
6228
aaa31047
PNA		 6229static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6230 struct nft_set *set,
6231 struct nft_set_elem *elem)
6232{
6233 struct nft_trans *trans;
6234
6235 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6236 sizeof(struct nft_trans_elem), GFP_KERNEL);
6237 if (!trans)
6238 return -ENOMEM;
6239
6240 nft_setelem_data_deactivate(ctx->net, set, elem);
6241 nft_trans_elem_set(trans) = set;
6242 nft_trans_elem(trans) = *elem;
6243 nft_trans_commit_list_add_tail(ctx->net, trans);
6244
6245 return 0;
6246}
6247
6248static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6249 struct nft_set *set)
6250{
6251 u8 genmask = nft_genmask_next(ctx->net);
6252 struct nft_set_elem_catchall *catchall;
6253 struct nft_set_elem elem;
6254 struct nft_set_ext *ext;
6255 int ret = 0;
6256
6257 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6258 ext = nft_set_elem_ext(set, catchall->elem);
6259 if (!nft_set_elem_active(ext, genmask) ||
6260 nft_set_elem_mark_busy(ext))
6261 continue;
6262
6263 elem.priv = catchall->elem;
6264 ret = __nft_set_catchall_flush(ctx, set, &elem);
6265 if (ret < 0)
6266 break;
6267 }
6268
6269 return ret;
6270}
6271
e6ba7cb6
PNA		 6272static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6273{
6274 struct nft_set_iter iter = {
6275 .genmask = genmask,
6276 .fn = nft_setelem_flush,
6277 };
6278
6279 set->ops->walk(ctx, set, &iter);
aaa31047
PNA		 6280 if (!iter.err)
6281 iter.err = nft_set_catchall_flush(ctx, set);
e6ba7cb6
PNA		 6282
6283 return iter.err;
6284}
6285
7dab8ee3
PNA		 6286static int nf_tables_delsetelem(struct sk_buff *skb,
6287 const struct nfnl_info *info,
6288 const struct nlattr * const nla[])
20a69341 6289{
7dab8ee3
PNA		 6290 struct netlink_ext_ack *extack = info->extack;
6291 u8 genmask = nft_genmask_next(info->net);
e2b750d7 6292 u8 family = info->nfmsg->nfgen_family;
7dab8ee3 6293 struct net *net = info->net;
20a69341 6294 const struct nlattr *attr;
e2b750d7 6295 struct nft_table *table;
20a69341
PM		 6296 struct nft_set *set;
6297 struct nft_ctx ctx;
60319eb1 6298 int rem, err = 0;
20a69341 6299
e2b750d7
PNA		 6300 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6301 genmask, NETLINK_CB(skb).portid);
6302 if (IS_ERR(table)) {
6303 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6304 return PTR_ERR(table);
6305 }
20a69341 6306
e2b750d7 6307 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
20a69341
PM		 6308 if (IS_ERR(set))
6309 return PTR_ERR(set);
6310 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6311 return -EBUSY;
6312
e2b750d7
PNA		 6313 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6314
e6ba7cb6
PNA		 6315 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6316 return nft_set_flush(&ctx, set, genmask);
8411b644 6317
20a69341
PM		 6318 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6319 err = nft_del_setelem(&ctx, set, attr);
6320 if (err < 0)
60319eb1 6321 break;
20a69341 6322 }
60319eb1 6323 return err;
20a69341
PM		 6324}
6325
cfed7e1b
PM		 6326void nft_set_gc_batch_release(struct rcu_head *rcu)
6327{
6328 struct nft_set_gc_batch *gcb;
6329 unsigned int i;
6330
6331 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6332 for (i = 0; i < gcb->head.cnt; i++)
61f9e292 6333 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
cfed7e1b
PM		 6334 kfree(gcb);
6335}
cfed7e1b
PM		 6336
6337struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6338 gfp_t gfp)
6339{
6340 struct nft_set_gc_batch *gcb;
6341
6342 gcb = kzalloc(sizeof(*gcb), gfp);
6343 if (gcb == NULL)
6344 return gcb;
6345 gcb->head.set = set;
6346 return gcb;
6347}
cfed7e1b 6348
e5009240
PNA		 6349/*
6350 * Stateful objects
6351 */
6352
6353/**
6354 * nft_register_obj- register nf_tables stateful object type
3db86c39 6355 * @obj_type: object type
e5009240
PNA		 6356 *
6357 * Registers the object type for use with nf_tables. Returns zero on
6358 * success or a negative errno code otherwise.
6359 */
6360int nft_register_obj(struct nft_object_type *obj_type)
6361{
6362 if (obj_type->type == NFT_OBJECT_UNSPEC)
6363 return -EINVAL;
6364
6365 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6366 list_add_rcu(&obj_type->list, &nf_tables_objects);
6367 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6368 return 0;
6369}
6370EXPORT_SYMBOL_GPL(nft_register_obj);
6371
6372/**
6373 * nft_unregister_obj - unregister nf_tables object type
3db86c39 6374 * @obj_type: object type
e5009240
PNA		 6375 *
6376 * Unregisters the object type for use with nf_tables.
6377 */
6378void nft_unregister_obj(struct nft_object_type *obj_type)
6379{
6380 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6381 list_del_rcu(&obj_type->list);
6382 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6383}
6384EXPORT_SYMBOL_GPL(nft_unregister_obj);
6385
4d44175a
FW		 6386struct nft_object *nft_obj_lookup(const struct net *net,
6387 const struct nft_table *table,
cac20fcd
PNA		 6388 const struct nlattr *nla, u32 objtype,
6389 u8 genmask)
e5009240 6390{
4d44175a
FW		 6391 struct nft_object_hash_key k = { .table = table };
6392 char search[NFT_OBJ_MAXNAMELEN];
6393 struct rhlist_head *tmp, *list;
e5009240
PNA		 6394 struct nft_object *obj;
6395
872f6903 6396 nla_strscpy(search, nla, sizeof(search));
4d44175a
FW		 6397 k.name = search;
6398
6399 WARN_ON_ONCE(!rcu_read_lock_held() &&
6400 !lockdep_commit_lock_is_held(net));
6401
6402 rcu_read_lock();
6403 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6404 if (!list)
6405 goto out;
6406
6407 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6408 if (objtype == obj->ops->type->type &&
6409 nft_active_genmask(obj, genmask)) {
6410 rcu_read_unlock();
e5009240 6411 return obj;
4d44175a 6412 }
e5009240 6413 }
4d44175a
FW		 6414out:
6415 rcu_read_unlock();
e5009240
PNA		 6416 return ERR_PTR(-ENOENT);
6417}
cac20fcd 6418EXPORT_SYMBOL_GPL(nft_obj_lookup);
e5009240 6419
cac20fcd
PNA		 6420static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6421 const struct nlattr *nla,
6422 u32 objtype, u8 genmask)
3ecbfd65
HS		 6423{
6424 struct nft_object *obj;
6425
6426 list_for_each_entry(obj, &table->objects, list) {
6427 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6428 objtype == obj->ops->type->type &&
6429 nft_active_genmask(obj, genmask))
6430 return obj;
6431 }
6432 return ERR_PTR(-ENOENT);
6433}
6434
e5009240 6435static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
b2fbd044
LZ		 6436 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
6437 .len = NFT_TABLE_MAXNAMELEN - 1 },
6438 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
6439 .len = NFT_OBJ_MAXNAMELEN - 1 },
e5009240
PNA		 6440 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
6441 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
3ecbfd65 6442 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
b131c964
JGG		 6443 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
6444 .len = NFT_USERDATA_MAXLEN },
e5009240
PNA		 6445};
6446
84fba055
FW		 6447static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6448 const struct nft_object_type *type,
e5009240
PNA		 6449 const struct nlattr *attr)
6450{
5b4c6e38 6451 struct nlattr **tb;
dfc46034 6452 const struct nft_object_ops *ops;
e5009240 6453 struct nft_object *obj;
5b4c6e38
GS		 6454 int err = -ENOMEM;
6455
6456 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6457 if (!tb)
6458 goto err1;
e5009240
PNA		 6459
6460 if (attr) {
8cb08174
JB		 6461 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6462 type->policy, NULL);
e5009240 6463 if (err < 0)
5b4c6e38 6464 goto err2;
e5009240
PNA		 6465 } else {
6466 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6467 }
6468
dfc46034
PBG		 6469 if (type->select_ops) {
6470 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6471 if (IS_ERR(ops)) {
6472 err = PTR_ERR(ops);
5b4c6e38 6473 goto err2;
dfc46034
PBG		 6474 }
6475 } else {
6476 ops = type->ops;
6477 }
6478
e5009240 6479 err = -ENOMEM;
dfc46034 6480 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
5b4c6e38
GS		 6481 if (!obj)
6482 goto err2;
e5009240 6483
dfc46034 6484 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
e5009240 6485 if (err < 0)
5b4c6e38 6486 goto err3;
e5009240 6487
dfc46034
PBG		 6488 obj->ops = ops;
6489
5b4c6e38 6490 kfree(tb);
e5009240 6491 return obj;
5b4c6e38 6492err3:
e5009240 6493 kfree(obj);
5b4c6e38
GS		 6494err2:
6495 kfree(tb);
e5009240
PNA		 6496err1:
6497 return ERR_PTR(err);
6498}
6499
6500static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
43da04a5 6501 struct nft_object *obj, bool reset)
e5009240
PNA		 6502{
6503 struct nlattr *nest;
6504
ae0be8de 6505 nest = nla_nest_start_noflag(skb, attr);
e5009240
PNA		 6506 if (!nest)
6507 goto nla_put_failure;
dfc46034 6508 if (obj->ops->dump(skb, obj, reset) < 0)
e5009240
PNA		 6509 goto nla_put_failure;
6510 nla_nest_end(skb, nest);
6511 return 0;
6512
6513nla_put_failure:
6514 return -1;
6515}
6516
6517static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6518{
6519 const struct nft_object_type *type;
6520
6521 list_for_each_entry(type, &nf_tables_objects, list) {
6522 if (objtype == type->type)
6523 return type;
6524 }
6525 return NULL;
6526}
6527
452238e8
FW		 6528static const struct nft_object_type *
6529nft_obj_type_get(struct net *net, u32 objtype)
e5009240
PNA		 6530{
6531 const struct nft_object_type *type;
6532
6533 type = __nft_obj_type_get(objtype);
6534 if (type != NULL && try_module_get(type->owner))
6535 return type;
6536
f102d66b 6537 lockdep_nfnl_nft_mutex_not_held();
e5009240
PNA		 6538#ifdef CONFIG_MODULES
6539 if (type == NULL) {
eb014de4 6540 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
e5009240
PNA		 6541 return ERR_PTR(-EAGAIN);
6542 }
6543#endif
6544 return ERR_PTR(-ENOENT);
6545}
6546
d62d0ba9
FFM		 6547static int nf_tables_updobj(const struct nft_ctx *ctx,
6548 const struct nft_object_type *type,
6549 const struct nlattr *attr,
6550 struct nft_object *obj)
6551{
6552 struct nft_object *newobj;
6553 struct nft_trans *trans;
dad3bdee
FW		 6554 int err = -ENOMEM;
6555
6556 if (!try_module_get(type->owner))
6557 return -ENOENT;
d62d0ba9
FFM		 6558
6559 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6560 sizeof(struct nft_trans_obj));
6561 if (!trans)
dad3bdee 6562 goto err_trans;
d62d0ba9
FFM		 6563
6564 newobj = nft_obj_init(ctx, type, attr);
6565 if (IS_ERR(newobj)) {
6566 err = PTR_ERR(newobj);
b74ae961 6567 goto err_free_trans;
d62d0ba9
FFM		 6568 }
6569
6570 nft_trans_obj(trans) = obj;
6571 nft_trans_obj_update(trans) = true;
6572 nft_trans_obj_newobj(trans) = newobj;
0854db2a 6573 nft_trans_commit_list_add_tail(ctx->net, trans);
d62d0ba9
FFM		 6574
6575 return 0;
b74ae961
DC		 6576
6577err_free_trans:
d62d0ba9 6578 kfree(trans);
dad3bdee
FW		 6579err_trans:
6580 module_put(type->owner);
d62d0ba9
FFM		 6581 return err;
6582}
6583
7dab8ee3
PNA		 6584static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
6585 const struct nlattr * const nla[])
e5009240 6586{
7dab8ee3
PNA		 6587 struct netlink_ext_ack *extack = info->extack;
6588 u8 genmask = nft_genmask_next(info->net);
ef4b65e5 6589 u8 family = info->nfmsg->nfgen_family;
e5009240 6590 const struct nft_object_type *type;
7dab8ee3 6591 struct net *net = info->net;
e5009240
PNA		 6592 struct nft_table *table;
6593 struct nft_object *obj;
6594 struct nft_ctx ctx;
6595 u32 objtype;
6596 int err;
6597
6598 if (!nla[NFTA_OBJ_TYPE] ||
6599 !nla[NFTA_OBJ_NAME] ||
6600 !nla[NFTA_OBJ_DATA])
6601 return -EINVAL;
6602
6001a930
PNA		 6603 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6604 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 6605 if (IS_ERR(table)) {
6606 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
e5009240 6607 return PTR_ERR(table);
36dd1bcc 6608 }
e5009240
PNA		 6609
6610 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4d44175a 6611 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
e5009240
PNA		 6612 if (IS_ERR(obj)) {
6613 err = PTR_ERR(obj);
36dd1bcc
PNA		 6614 if (err != -ENOENT) {
6615 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
e5009240 6616 return err;
36dd1bcc 6617 }
1a28ad74 6618 } else {
7dab8ee3 6619 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
36dd1bcc 6620 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
e5009240 6621 return -EEXIST;
36dd1bcc 6622 }
7dab8ee3 6623 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
d62d0ba9
FFM		 6624 return -EOPNOTSUPP;
6625
fd57d0cb 6626 type = __nft_obj_type_get(objtype);
7dab8ee3 6627 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
d62d0ba9
FFM		 6628
6629 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
e5009240
PNA		 6630 }
6631
7dab8ee3 6632 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
e5009240 6633
452238e8 6634 type = nft_obj_type_get(net, objtype);
e5009240
PNA		 6635 if (IS_ERR(type))
6636 return PTR_ERR(type);
6637
84fba055 6638 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
e5009240
PNA		 6639 if (IS_ERR(obj)) {
6640 err = PTR_ERR(obj);
b131c964 6641 goto err_init;
e5009240 6642 }
d152159b 6643 obj->key.table = table;
3ecbfd65
HS		 6644 obj->handle = nf_tables_alloc_handle(table);
6645
d152159b
FW		 6646 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
6647 if (!obj->key.name) {
61509575 6648 err = -ENOMEM;
b131c964
JGG		 6649 goto err_strdup;
6650 }
6651
6652 if (nla[NFTA_OBJ_USERDATA]) {
85db827a 6653 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
b131c964
JGG		 6654 if (obj->udata == NULL)
6655 goto err_userdata;
6656
85db827a 6657 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
61509575 6658 }
e5009240
PNA		 6659
6660 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6661 if (err < 0)
b131c964 6662 goto err_trans;
e5009240 6663
4d44175a
FW		 6664 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6665 nft_objname_ht_params);
6666 if (err < 0)
b131c964 6667 goto err_obj_ht;
4d44175a 6668
e5009240
PNA		 6669 list_add_tail_rcu(&obj->list, &table->objects);
6670 table->use++;
6671 return 0;
b131c964 6672err_obj_ht:
4d44175a
FW		 6673 /* queued in transaction log */
6674 INIT_LIST_HEAD(&obj->list);
6675 return err;
b131c964 6676err_trans:
b131c964 6677 kfree(obj->udata);
85dfd816
PNA		 6678err_userdata:
6679 kfree(obj->key.name);
b131c964 6680err_strdup:
dfc46034 6681 if (obj->ops->destroy)
00bfb320 6682 obj->ops->destroy(&ctx, obj);
e5009240 6683 kfree(obj);
b131c964 6684err_init:
e5009240
PNA		 6685 module_put(type->owner);
6686 return err;
6687}
6688
6689static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6690 u32 portid, u32 seq, int event, u32 flags,
6691 int family, const struct nft_table *table,
43da04a5 6692 struct nft_object *obj, bool reset)
e5009240 6693{
e5009240
PNA		 6694 struct nlmsghdr *nlh;
6695
dedb67c4 6696 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
19c28b13
PNA		 6697 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
6698 NFNETLINK_V0, nft_base_seq(net));
6699 if (!nlh)
e5009240
PNA		 6700 goto nla_put_failure;
6701
e5009240 6702 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
d152159b 6703 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
dfc46034 6704 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
e5009240 6705 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
3ecbfd65
HS		 6706 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6707 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6708 NFTA_OBJ_PAD))
e5009240
PNA		 6709 goto nla_put_failure;
6710
b131c964
JGG		 6711 if (obj->udata &&
6712 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6713 goto nla_put_failure;
6714
e5009240
PNA		 6715 nlmsg_end(skb, nlh);
6716 return 0;
6717
6718nla_put_failure:
6719 nlmsg_trim(skb, nlh);
6720 return -1;
6721}
6722
a9fea2a3 6723struct nft_obj_filter {
e46abbcc 6724 char *table;
a9fea2a3
PNA		 6725 u32 type;
6726};
6727
e5009240
PNA		 6728static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6729{
6730 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
e5009240 6731 const struct nft_table *table;
e5009240 6732 unsigned int idx = 0, s_idx = cb->args[0];
a9fea2a3 6733 struct nft_obj_filter *filter = cb->data;
e5009240
PNA		 6734 struct net *net = sock_net(skb->sk);
6735 int family = nfmsg->nfgen_family;
0854db2a 6736 struct nftables_pernet *nft_net;
43da04a5
PNA		 6737 struct nft_object *obj;
6738 bool reset = false;
6739
6740 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6741 reset = true;
e5009240
PNA		 6742
6743 rcu_read_lock();
d59d2f82 6744 nft_net = nft_pernet(net);
0854db2a 6745 cb->seq = nft_net->base_seq;
e5009240 6746
0854db2a 6747 list_for_each_entry_rcu(table, &nft_net->tables, list) {
98319cb9 6748 if (family != NFPROTO_UNSPEC && family != table->family)
e5009240
PNA		 6749 continue;
6750
36596dad
PNA		 6751 list_for_each_entry_rcu(obj, &table->objects, list) {
6752 if (!nft_is_active(net, obj))
6753 goto cont;
6754 if (idx < s_idx)
6755 goto cont;
6756 if (idx > s_idx)
6757 memset(&cb->args[1], 0,
6758 sizeof(cb->args) - sizeof(cb->args[0]));
360cc79d 6759 if (filter && filter->table &&
36596dad
PNA		 6760 strcmp(filter->table, table->name))
6761 goto cont;
6762 if (filter &&
6763 filter->type != NFT_OBJECT_UNSPEC &&
6764 obj->ops->type->type != filter->type)
6765 goto cont;
8e6cf365 6766 if (reset) {
68df2ed5 6767 char *buf = kasprintf(GFP_ATOMIC,
c520292f 6768 "%s:%u",
8e6cf365 6769 table->name,
0854db2a 6770 nft_net->base_seq);
8e6cf365
RGB		 6771
6772 audit_log_nfcfg(buf,
6773 family,
6774 obj->handle,
14224039 6775 AUDIT_NFT_OP_OBJ_RESET,
68df2ed5 6776 GFP_ATOMIC);
8e6cf365
RGB		 6777 kfree(buf);
6778 }
6779
36596dad
PNA		 6780 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6781 cb->nlh->nlmsg_seq,
6782 NFT_MSG_NEWOBJ,
6783 NLM_F_MULTI | NLM_F_APPEND,
98319cb9 6784 table->family, table,
36596dad
PNA		 6785 obj, reset) < 0)
6786 goto done;
e5009240 6787
36596dad 6788 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
e5009240 6789cont:
36596dad 6790 idx++;
e5009240
PNA		 6791 }
6792 }
6793done:
6794 rcu_read_unlock();
6795
6796 cb->args[0] = idx;
6797 return skb->len;
6798}
6799
90fd131a 6800static int nf_tables_dump_obj_start(struct netlink_callback *cb)
a9fea2a3 6801{
90fd131a
FW		 6802 const struct nlattr * const *nla = cb->data;
6803 struct nft_obj_filter *filter = NULL;
e46abbcc 6804
90fd131a
FW		 6805 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6806 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6807 if (!filter)
6808 return -ENOMEM;
6809
6810 if (nla[NFTA_OBJ_TABLE]) {
6811 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6812 if (!filter->table) {
6813 kfree(filter);
6814 return -ENOMEM;
6815 }
6816 }
6817
6818 if (nla[NFTA_OBJ_TYPE])
6819 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
8bea728d 6820 }
a9fea2a3 6821
90fd131a 6822 cb->data = filter;
a9fea2a3
PNA		 6823 return 0;
6824}
6825
90fd131a 6826static int nf_tables_dump_obj_done(struct netlink_callback *cb)
a9fea2a3 6827{
90fd131a 6828 struct nft_obj_filter *filter = cb->data;
a9fea2a3 6829
90fd131a
FW		 6830 if (filter) {
6831 kfree(filter->table);
6832 kfree(filter);
e46abbcc 6833 }
a9fea2a3 6834
90fd131a 6835 return 0;
a9fea2a3
PNA		 6836}
6837
d9adf22a 6838/* called with rcu_read_lock held */
797d4980
PNA		 6839static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
6840 const struct nlattr * const nla[])
e5009240 6841{
797d4980
PNA		 6842 struct netlink_ext_ack *extack = info->extack;
6843 u8 genmask = nft_genmask_cur(info->net);
ef4b65e5 6844 u8 family = info->nfmsg->nfgen_family;
e5009240 6845 const struct nft_table *table;
797d4980 6846 struct net *net = info->net;
e5009240
PNA		 6847 struct nft_object *obj;
6848 struct sk_buff *skb2;
43da04a5 6849 bool reset = false;
e5009240
PNA		 6850 u32 objtype;
6851 int err;
6852
797d4980 6853 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
e5009240 6854 struct netlink_dump_control c = {
90fd131a 6855 .start = nf_tables_dump_obj_start,
e5009240 6856 .dump = nf_tables_dump_obj,
a9fea2a3 6857 .done = nf_tables_dump_obj_done,
d9adf22a 6858 .module = THIS_MODULE,
90fd131a 6859 .data = (void *)nla,
e5009240 6860 };
a9fea2a3 6861
797d4980 6862 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
e5009240
PNA		 6863 }
6864
6865 if (!nla[NFTA_OBJ_NAME] ||
6866 !nla[NFTA_OBJ_TYPE])
6867 return -EINVAL;
6868
6001a930 6869 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
36dd1bcc
PNA		 6870 if (IS_ERR(table)) {
6871 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
e5009240 6872 return PTR_ERR(table);
36dd1bcc 6873 }
e5009240
PNA		 6874
6875 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4d44175a 6876 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
36dd1bcc
PNA		 6877 if (IS_ERR(obj)) {
6878 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
e5009240 6879 return PTR_ERR(obj);
36dd1bcc 6880 }
e5009240 6881
d9adf22a 6882 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
e5009240
PNA		 6883 if (!skb2)
6884 return -ENOMEM;
6885
797d4980 6886 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
43da04a5
PNA		 6887 reset = true;
6888
8e6cf365 6889 if (reset) {
0854db2a
FW		 6890 const struct nftables_pernet *nft_net;
6891 char *buf;
6892
d59d2f82 6893 nft_net = nft_pernet(net);
0854db2a 6894 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
8e6cf365
RGB		 6895
6896 audit_log_nfcfg(buf,
6897 family,
6898 obj->handle,
14224039 6899 AUDIT_NFT_OP_OBJ_RESET,
68df2ed5 6900 GFP_ATOMIC);
8e6cf365
RGB		 6901 kfree(buf);
6902 }
6903
e5009240 6904 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
797d4980 6905 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
43da04a5 6906 family, table, obj, reset);
e5009240 6907 if (err < 0)
ee921183 6908 goto err_fill_obj_info;
e5009240 6909
ee921183
PNA		 6910 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6911
6912err_fill_obj_info:
e5009240
PNA		 6913 kfree_skb(skb2);
6914 return err;
e5009240
PNA		 6915}
6916
00bfb320 6917static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
e5009240 6918{
dfc46034 6919 if (obj->ops->destroy)
00bfb320 6920 obj->ops->destroy(ctx, obj);
e5009240 6921
dfc46034 6922 module_put(obj->ops->type->owner);
d152159b 6923 kfree(obj->key.name);
bc7a7082 6924 kfree(obj->udata);
e5009240
PNA		 6925 kfree(obj);
6926}
6927
7dab8ee3
PNA		 6928static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
6929 const struct nlattr * const nla[])
e5009240 6930{
7dab8ee3
PNA		 6931 struct netlink_ext_ack *extack = info->extack;
6932 u8 genmask = nft_genmask_next(info->net);
ef4b65e5 6933 u8 family = info->nfmsg->nfgen_family;
7dab8ee3 6934 struct net *net = info->net;
36dd1bcc 6935 const struct nlattr *attr;
e5009240
PNA		 6936 struct nft_table *table;
6937 struct nft_object *obj;
6938 struct nft_ctx ctx;
6939 u32 objtype;
6940
6941 if (!nla[NFTA_OBJ_TYPE] ||
3ecbfd65 6942 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
e5009240
PNA		 6943 return -EINVAL;
6944
6001a930
PNA		 6945 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6946 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 6947 if (IS_ERR(table)) {
6948 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
e5009240 6949 return PTR_ERR(table);
36dd1bcc 6950 }
e5009240
PNA		 6951
6952 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
36dd1bcc
PNA		 6953 if (nla[NFTA_OBJ_HANDLE]) {
6954 attr = nla[NFTA_OBJ_HANDLE];
6955 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
6956 } else {
6957 attr = nla[NFTA_OBJ_NAME];
4d44175a 6958 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
36dd1bcc
PNA		 6959 }
6960
6961 if (IS_ERR(obj)) {
6962 NL_SET_BAD_ATTR(extack, attr);
e5009240 6963 return PTR_ERR(obj);
36dd1bcc
PNA		 6964 }
6965 if (obj->use > 0) {
6966 NL_SET_BAD_ATTR(extack, attr);
e5009240 6967 return -EBUSY;
36dd1bcc 6968 }
e5009240 6969
7dab8ee3 6970 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
e5009240
PNA		 6971
6972 return nft_delobj(&ctx, obj);
6973}
6974
d152159b 6975void nft_obj_notify(struct net *net, const struct nft_table *table,
25e94a99 6976 struct nft_object *obj, u32 portid, u32 seq, int event,
6fb721cf 6977 u16 flags, int family, int report, gfp_t gfp)
e5009240 6978{
d59d2f82 6979 struct nftables_pernet *nft_net = nft_pernet(net);
e5009240
PNA		 6980 struct sk_buff *skb;
6981 int err;
c520292f 6982 char *buf = kasprintf(gfp, "%s:%u",
0854db2a 6983 table->name, nft_net->base_seq);
8e6cf365
RGB		 6984
6985 audit_log_nfcfg(buf,
6986 family,
6987 obj->handle,
6988 event == NFT_MSG_NEWOBJ ?
c520292f
RGB		 6989 AUDIT_NFT_OP_OBJ_REGISTER :
6990 AUDIT_NFT_OP_OBJ_UNREGISTER,
68df2ed5 6991 gfp);
8e6cf365 6992 kfree(buf);
e5009240 6993
2599e989
PNA		 6994 if (!report &&
6995 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 6996 return;
e5009240 6997
2599e989 6998 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
e5009240
PNA		 6999 if (skb == NULL)
7000 goto err;
7001
6fb721cf
PNA		 7002 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7003 flags & (NLM_F_CREATE | NLM_F_EXCL),
7004 family, table, obj, false);
e5009240
PNA		 7005 if (err < 0) {
7006 kfree_skb(skb);
7007 goto err;
7008 }
7009
0854db2a 7010 nft_notify_enqueue(skb, report, &nft_net->notify_list);
25e94a99 7011 return;
e5009240 7012err:
25e94a99 7013 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
e5009240 7014}
2599e989
PNA		 7015EXPORT_SYMBOL_GPL(nft_obj_notify);
7016
25e94a99
PNA		 7017static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7018 struct nft_object *obj, int event)
2599e989 7019{
25e94a99 7020 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
6fb721cf 7021 ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
2599e989 7022}
e5009240 7023
3b49e2e9
PNA		 7024/*
7025 * Flow tables
7026 */
7027void nft_register_flowtable_type(struct nf_flowtable_type *type)
7028{
7029 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7030 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7031 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7032}
7033EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7034
7035void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7036{
7037 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7038 list_del_rcu(&type->list);
7039 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7040}
7041EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7042
7043static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7044 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
7045 .len = NFT_NAME_MAXLEN - 1 },
7046 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
7047 .len = NFT_NAME_MAXLEN - 1 },
7048 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
3ecbfd65 7049 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
8bb69f3b 7050 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
3b49e2e9
PNA		 7051};
7052
cac20fcd
PNA		 7053struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7054 const struct nlattr *nla, u8 genmask)
3b49e2e9
PNA		 7055{
7056 struct nft_flowtable *flowtable;
7057
d9adf22a 7058 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
3b49e2e9
PNA		 7059 if (!nla_strcmp(nla, flowtable->name) &&
7060 nft_active_genmask(flowtable, genmask))
7061 return flowtable;
7062 }
7063 return ERR_PTR(-ENOENT);
7064}
cac20fcd 7065EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
3b49e2e9 7066
9b05b6e1
LGL		 7067void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7068 struct nft_flowtable *flowtable,
7069 enum nft_trans_phase phase)
7070{
7071 switch (phase) {
7072 case NFT_TRANS_PREPARE:
7073 case NFT_TRANS_ABORT:
7074 case NFT_TRANS_RELEASE:
7075 flowtable->use--;
954d8297 7076 fallthrough;
9b05b6e1
LGL		 7077 default:
7078 return;
7079 }
7080}
7081EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7082
ae0662f8 7083static struct nft_flowtable *
cac20fcd
PNA		 7084nft_flowtable_lookup_byhandle(const struct nft_table *table,
7085 const struct nlattr *nla, u8 genmask)
3ecbfd65
HS		 7086{
7087 struct nft_flowtable *flowtable;
7088
7089 list_for_each_entry(flowtable, &table->flowtables, list) {
7090 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7091 nft_active_genmask(flowtable, genmask))
7092 return flowtable;
7093 }
7094 return ERR_PTR(-ENOENT);
7095}
7096
d9246a53
PNA		 7097struct nft_flowtable_hook {
7098 u32 num;
7099 int priority;
7100 struct list_head list;
7101};
7102
3b49e2e9
PNA		 7103static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7104 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
7105 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
7106 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
7107};
7108
d9246a53
PNA		 7109static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7110 const struct nlattr *attr,
7111 struct nft_flowtable_hook *flowtable_hook,
5b6743fb 7112 struct nft_flowtable *flowtable, bool add)
3b49e2e9 7113{
3b49e2e9 7114 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
3f0465a9 7115 struct nft_hook *hook;
3b49e2e9 7116 int hooknum, priority;
3f0465a9 7117 int err;
3b49e2e9 7118
d9246a53
PNA		 7119 INIT_LIST_HEAD(&flowtable_hook->list);
7120
8cb08174
JB		 7121 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7122 nft_flowtable_hook_policy, NULL);
3b49e2e9
PNA		 7123 if (err < 0)
7124 return err;
7125
5b6743fb
PNA		 7126 if (add) {
7127 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7128 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7129 return -EINVAL;
3b49e2e9 7130
5b6743fb
PNA		 7131 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7132 if (hooknum != NF_NETDEV_INGRESS)
7133 return -EOPNOTSUPP;
7134
7135 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7136
7137 flowtable_hook->priority = priority;
7138 flowtable_hook->num = hooknum;
7139 } else {
7140 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7141 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7142 if (hooknum != flowtable->hooknum)
7143 return -EOPNOTSUPP;
7144 }
7145
7146 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7147 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7148 if (priority != flowtable->data.priority)
7149 return -EOPNOTSUPP;
7150 }
3b49e2e9 7151
5b6743fb
PNA		 7152 flowtable_hook->priority = flowtable->data.priority;
7153 flowtable_hook->num = flowtable->hooknum;
7154 }
3b49e2e9 7155
05abe445
PNA		 7156 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7157 err = nf_tables_parse_netdev_hooks(ctx->net,
7158 tb[NFTA_FLOWTABLE_HOOK_DEVS],
7159 &flowtable_hook->list);
7160 if (err < 0)
7161 return err;
7162 }
3b49e2e9 7163
d9246a53 7164 list_for_each_entry(hook, &flowtable_hook->list, list) {
3f0465a9 7165 hook->ops.pf = NFPROTO_NETDEV;
5b6743fb
PNA		 7166 hook->ops.hooknum = flowtable_hook->num;
7167 hook->ops.priority = flowtable_hook->priority;
7168 hook->ops.priv = &flowtable->data;
7169 hook->ops.hook = flowtable->data.type->hook;
3b49e2e9
PNA		 7170 }
7171
3b49e2e9
PNA		 7172 return err;
7173}
7174
98319cb9 7175static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
3b49e2e9
PNA		 7176{
7177 const struct nf_flowtable_type *type;
7178
7179 list_for_each_entry(type, &nf_tables_flowtables, list) {
98319cb9 7180 if (family == type->family)
3b49e2e9
PNA		 7181 return type;
7182 }
7183 return NULL;
7184}
7185
452238e8
FW		 7186static const struct nf_flowtable_type *
7187nft_flowtable_type_get(struct net *net, u8 family)
3b49e2e9
PNA		 7188{
7189 const struct nf_flowtable_type *type;
7190
98319cb9 7191 type = __nft_flowtable_type_get(family);
3b49e2e9
PNA		 7192 if (type != NULL && try_module_get(type->owner))
7193 return type;
7194
f102d66b 7195 lockdep_nfnl_nft_mutex_not_held();
3b49e2e9
PNA		 7196#ifdef CONFIG_MODULES
7197 if (type == NULL) {
eb014de4 7198 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
3b49e2e9
PNA		 7199 return ERR_PTR(-EAGAIN);
7200 }
7201#endif
7202 return ERR_PTR(-ENOENT);
7203}
7204
5acab914 7205/* Only called from error and netdev event paths. */
ff4bf2f4
PNA		 7206static void nft_unregister_flowtable_hook(struct net *net,
7207 struct nft_flowtable *flowtable,
7208 struct nft_hook *hook)
7209{
7210 nf_unregister_net_hook(net, &hook->ops);
7211 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7212 FLOW_BLOCK_UNBIND);
7213}
7214
3b49e2e9 7215static void nft_unregister_flowtable_net_hooks(struct net *net,
f9382669 7216 struct list_head *hook_list)
3b49e2e9 7217{
3f0465a9 7218 struct nft_hook *hook;
3b49e2e9 7219
f9382669 7220 list_for_each_entry(hook, hook_list, list)
5acab914 7221 nf_unregister_net_hook(net, &hook->ops);
3f0465a9
PNA		 7222}
7223
7224static int nft_register_flowtable_net_hooks(struct net *net,
7225 struct nft_table *table,
f9382669 7226 struct list_head *hook_list,
3f0465a9
PNA		 7227 struct nft_flowtable *flowtable)
7228{
7229 struct nft_hook *hook, *hook2, *next;
7230 struct nft_flowtable *ft;
7231 int err, i = 0;
7232
f9382669 7233 list_for_each_entry(hook, hook_list, list) {
3f0465a9 7234 list_for_each_entry(ft, &table->flowtables, list) {
86fe2c19
PNA		 7235 if (!nft_is_active_next(net, ft))
7236 continue;
7237
3f0465a9
PNA		 7238 list_for_each_entry(hook2, &ft->hook_list, list) {
7239 if (hook->ops.dev == hook2->ops.dev &&
7240 hook->ops.pf == hook2->ops.pf) {
77a92189 7241 err = -EEXIST;
3f0465a9
PNA		 7242 goto err_unregister_net_hooks;
7243 }
7244 }
7245 }
3b49e2e9 7246
d7c03a9f 7247 err = flowtable->data.type->setup(&flowtable->data,
7248 hook->ops.dev,
7249 FLOW_BLOCK_BIND);
3f0465a9
PNA		 7250 if (err < 0)
7251 goto err_unregister_net_hooks;
7252
d7c03a9f 7253 err = nf_register_net_hook(net, &hook->ops);
7254 if (err < 0) {
7255 flowtable->data.type->setup(&flowtable->data,
7256 hook->ops.dev,
7257 FLOW_BLOCK_UNBIND);
7258 goto err_unregister_net_hooks;
7259 }
7260
3f0465a9 7261 i++;
3b49e2e9 7262 }
3f0465a9
PNA		 7263
7264 return 0;
7265
7266err_unregister_net_hooks:
f9382669 7267 list_for_each_entry_safe(hook, next, hook_list, list) {
3f0465a9
PNA		 7268 if (i-- <= 0)
7269 break;
7270
ff4bf2f4 7271 nft_unregister_flowtable_hook(net, flowtable, hook);
3f0465a9
PNA		 7272 list_del_rcu(&hook->list);
7273 kfree_rcu(hook, rcu);
7274 }
7275
7276 return err;
3b49e2e9
PNA		 7277}
7278
389a2cbc
PNA		 7279static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7280{
7281 struct nft_hook *hook, *next;
7282
7283 list_for_each_entry_safe(hook, next, hook_list, list) {
7284 list_del_rcu(&hook->list);
7285 kfree_rcu(hook, rcu);
7286 }
7287}
7288
78d9f48f
PNA		 7289static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7290 struct nft_flowtable *flowtable)
7291{
7292 const struct nlattr * const *nla = ctx->nla;
7293 struct nft_flowtable_hook flowtable_hook;
7294 struct nft_hook *hook, *next;
7295 struct nft_trans *trans;
7296 bool unregister = false;
7b35582c 7297 u32 flags;
78d9f48f
PNA		 7298 int err;
7299
7300 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
5b6743fb 7301 &flowtable_hook, flowtable, false);
78d9f48f
PNA		 7302 if (err < 0)
7303 return err;
7304
7305 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7306 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7307 list_del(&hook->list);
7308 kfree(hook);
7309 }
7310 }
7311
7b35582c
PNA		 7312 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7313 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7314 if (flags & ~NFT_FLOWTABLE_MASK)
7315 return -EOPNOTSUPP;
7316 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7317 (flags & NFT_FLOWTABLE_HW_OFFLOAD))
7318 return -EOPNOTSUPP;
7319 } else {
7320 flags = flowtable->data.flags;
7321 }
7322
78d9f48f
PNA		 7323 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7324 &flowtable_hook.list, flowtable);
7325 if (err < 0)
7326 goto err_flowtable_update_hook;
7327
7328 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7329 sizeof(struct nft_trans_flowtable));
7330 if (!trans) {
7331 unregister = true;
7332 err = -ENOMEM;
7333 goto err_flowtable_update_hook;
7334 }
7335
7b35582c 7336 nft_trans_flowtable_flags(trans) = flags;
78d9f48f
PNA		 7337 nft_trans_flowtable(trans) = flowtable;
7338 nft_trans_flowtable_update(trans) = true;
7339 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7340 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7341
0854db2a 7342 nft_trans_commit_list_add_tail(ctx->net, trans);
78d9f48f
PNA		 7343
7344 return 0;
7345
7346err_flowtable_update_hook:
7347 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7348 if (unregister)
7349 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7350 list_del_rcu(&hook->list);
7351 kfree_rcu(hook, rcu);
7352 }
7353
7354 return err;
7355
7356}
7357
7dab8ee3
PNA		 7358static int nf_tables_newflowtable(struct sk_buff *skb,
7359 const struct nfnl_info *info,
7360 const struct nlattr * const nla[])
3b49e2e9 7361{
7dab8ee3 7362 struct netlink_ext_ack *extack = info->extack;
d9246a53 7363 struct nft_flowtable_hook flowtable_hook;
7dab8ee3 7364 u8 genmask = nft_genmask_next(info->net);
ef4b65e5 7365 u8 family = info->nfmsg->nfgen_family;
3b49e2e9 7366 const struct nf_flowtable_type *type;
3f0465a9
PNA		 7367 struct nft_flowtable *flowtable;
7368 struct nft_hook *hook, *next;
7dab8ee3 7369 struct net *net = info->net;
3b49e2e9
PNA		 7370 struct nft_table *table;
7371 struct nft_ctx ctx;
3f0465a9 7372 int err;
3b49e2e9
PNA		 7373
7374 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7375 !nla[NFTA_FLOWTABLE_NAME] ||
7376 !nla[NFTA_FLOWTABLE_HOOK])
7377 return -EINVAL;
7378
cac20fcd 7379 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6001a930 7380 genmask, NETLINK_CB(skb).portid);
36dd1bcc
PNA		 7381 if (IS_ERR(table)) {
7382 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
3b49e2e9 7383 return PTR_ERR(table);
36dd1bcc 7384 }
3b49e2e9 7385
cac20fcd
PNA		 7386 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7387 genmask);
3b49e2e9
PNA		 7388 if (IS_ERR(flowtable)) {
7389 err = PTR_ERR(flowtable);
36dd1bcc
PNA		 7390 if (err != -ENOENT) {
7391 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
3b49e2e9 7392 return err;
36dd1bcc 7393 }
3b49e2e9 7394 } else {
7dab8ee3 7395 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
36dd1bcc 7396 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
3b49e2e9 7397 return -EEXIST;
36dd1bcc 7398 }
3b49e2e9 7399
7dab8ee3 7400 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
78d9f48f 7401
7dab8ee3 7402 return nft_flowtable_update(&ctx, info->nlh, flowtable);
3b49e2e9
PNA		 7403 }
7404
7dab8ee3 7405 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
3b49e2e9
PNA		 7406
7407 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
7408 if (!flowtable)
7409 return -ENOMEM;
7410
7411 flowtable->table = table;
3ecbfd65 7412 flowtable->handle = nf_tables_alloc_handle(table);
3f0465a9 7413 INIT_LIST_HEAD(&flowtable->hook_list);
3ecbfd65 7414
3b49e2e9
PNA		 7415 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
7416 if (!flowtable->name) {
7417 err = -ENOMEM;
7418 goto err1;
7419 }
7420
452238e8 7421 type = nft_flowtable_type_get(net, family);
3b49e2e9
PNA		 7422 if (IS_ERR(type)) {
7423 err = PTR_ERR(type);
7424 goto err2;
7425 }
7426
8bb69f3b
PNA		 7427 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7428 flowtable->data.flags =
7429 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7e6136f1
PNA		 7430 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7431 err = -EOPNOTSUPP;
8bb69f3b 7432 goto err3;
7e6136f1 7433 }
8bb69f3b
PNA		 7434 }
7435
7436 write_pnet(&flowtable->data.net, net);
3b49e2e9 7437 flowtable->data.type = type;
a268de77 7438 err = type->init(&flowtable->data);
3b49e2e9
PNA		 7439 if (err < 0)
7440 goto err3;
7441
d9246a53 7442 err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
5b6743fb 7443 &flowtable_hook, flowtable, true);
3b49e2e9 7444 if (err < 0)
a268de77 7445 goto err4;
3b49e2e9 7446
d9246a53
PNA		 7447 list_splice(&flowtable_hook.list, &flowtable->hook_list);
7448 flowtable->data.priority = flowtable_hook.priority;
7449 flowtable->hooknum = flowtable_hook.num;
7450
f9382669
PNA		 7451 err = nft_register_flowtable_net_hooks(ctx.net, table,
7452 &flowtable->hook_list,
7453 flowtable);
2d285f26 7454 if (err < 0) {
389a2cbc 7455 nft_flowtable_hooks_destroy(&flowtable->hook_list);
3f0465a9 7456 goto err4;
2d285f26 7457 }
3b49e2e9
PNA		 7458
7459 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7460 if (err < 0)
3f0465a9 7461 goto err5;
3b49e2e9
PNA		 7462
7463 list_add_tail_rcu(&flowtable->list, &table->flowtables);
7464 table->use++;
7465
7466 return 0;
a268de77 7467err5:
3f0465a9 7468 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
ff4bf2f4 7469 nft_unregister_flowtable_hook(net, flowtable, hook);
3f0465a9
PNA		 7470 list_del_rcu(&hook->list);
7471 kfree_rcu(hook, rcu);
7472 }
a268de77
FF		 7473err4:
7474 flowtable->data.type->free(&flowtable->data);
3b49e2e9
PNA		 7475err3:
7476 module_put(type->owner);
7477err2:
7478 kfree(flowtable->name);
7479err1:
7480 kfree(flowtable);
7481 return err;
7482}
7483
3003055f
PNA		 7484static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7485{
7486 struct nft_hook *this, *next;
7487
7488 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7489 list_del(&this->list);
7490 kfree(this);
7491 }
7492}
7493
abadb2f8
PNA		 7494static int nft_delflowtable_hook(struct nft_ctx *ctx,
7495 struct nft_flowtable *flowtable)
7496{
7497 const struct nlattr * const *nla = ctx->nla;
7498 struct nft_flowtable_hook flowtable_hook;
3003055f 7499 struct nft_hook *this, *hook;
abadb2f8
PNA		 7500 struct nft_trans *trans;
7501 int err;
7502
7503 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
5b6743fb 7504 &flowtable_hook, flowtable, false);
abadb2f8
PNA		 7505 if (err < 0)
7506 return err;
7507
3003055f 7508 list_for_each_entry(this, &flowtable_hook.list, list) {
abadb2f8
PNA		 7509 hook = nft_hook_list_find(&flowtable->hook_list, this);
7510 if (!hook) {
7511 err = -ENOENT;
7512 goto err_flowtable_del_hook;
7513 }
7514 hook->inactive = true;
abadb2f8
PNA		 7515 }
7516
7517 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7518 sizeof(struct nft_trans_flowtable));
3003055f
PNA		 7519 if (!trans) {
7520 err = -ENOMEM;
7521 goto err_flowtable_del_hook;
7522 }
abadb2f8
PNA		 7523
7524 nft_trans_flowtable(trans) = flowtable;
7525 nft_trans_flowtable_update(trans) = true;
7526 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
3003055f 7527 nft_flowtable_hook_release(&flowtable_hook);
abadb2f8 7528
0854db2a 7529 nft_trans_commit_list_add_tail(ctx->net, trans);
abadb2f8
PNA		 7530
7531 return 0;
7532
7533err_flowtable_del_hook:
3003055f
PNA		 7534 list_for_each_entry(this, &flowtable_hook.list, list) {
7535 hook = nft_hook_list_find(&flowtable->hook_list, this);
7536 if (!hook)
7537 break;
7538
abadb2f8 7539 hook->inactive = false;
3003055f
PNA		 7540 }
7541 nft_flowtable_hook_release(&flowtable_hook);
abadb2f8
PNA		 7542
7543 return err;
7544}
7545
7dab8ee3
PNA		 7546static int nf_tables_delflowtable(struct sk_buff *skb,
7547 const struct nfnl_info *info,
7548 const struct nlattr * const nla[])
3b49e2e9 7549{
7dab8ee3
PNA		 7550 struct netlink_ext_ack *extack = info->extack;
7551 u8 genmask = nft_genmask_next(info->net);
ef4b65e5 7552 u8 family = info->nfmsg->nfgen_family;
3b49e2e9 7553 struct nft_flowtable *flowtable;
7dab8ee3 7554 struct net *net = info->net;
36dd1bcc 7555 const struct nlattr *attr;
3b49e2e9
PNA		 7556 struct nft_table *table;
7557 struct nft_ctx ctx;
7558
e603ea4b
PNA		 7559 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7560 (!nla[NFTA_FLOWTABLE_NAME] &&
7561 !nla[NFTA_FLOWTABLE_HANDLE]))
7562 return -EINVAL;
7563
cac20fcd 7564 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6001a930 7565 genmask, NETLINK_CB(skb).portid);
36dd1bcc
PNA		 7566 if (IS_ERR(table)) {
7567 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
3b49e2e9 7568 return PTR_ERR(table);
36dd1bcc 7569 }
3b49e2e9 7570
36dd1bcc
PNA		 7571 if (nla[NFTA_FLOWTABLE_HANDLE]) {
7572 attr = nla[NFTA_FLOWTABLE_HANDLE];
7573 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7574 } else {
7575 attr = nla[NFTA_FLOWTABLE_NAME];
7576 flowtable = nft_flowtable_lookup(table, attr, genmask);
7577 }
7578
7579 if (IS_ERR(flowtable)) {
7580 NL_SET_BAD_ATTR(extack, attr);
7581 return PTR_ERR(flowtable);
7582 }
abadb2f8 7583
7dab8ee3 7584 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
abadb2f8
PNA		 7585
7586 if (nla[NFTA_FLOWTABLE_HOOK])
7587 return nft_delflowtable_hook(&ctx, flowtable);
7588
36dd1bcc
PNA		 7589 if (flowtable->use > 0) {
7590 NL_SET_BAD_ATTR(extack, attr);
3b49e2e9 7591 return -EBUSY;
36dd1bcc 7592 }
3b49e2e9 7593
3b49e2e9
PNA		 7594 return nft_delflowtable(&ctx, flowtable);
7595}
7596
7597static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7598 u32 portid, u32 seq, int event,
7599 u32 flags, int family,
c42d8bda
PNA		 7600 struct nft_flowtable *flowtable,
7601 struct list_head *hook_list)
3b49e2e9
PNA		 7602{
7603 struct nlattr *nest, *nest_devs;
3f0465a9 7604 struct nft_hook *hook;
3b49e2e9 7605 struct nlmsghdr *nlh;
3b49e2e9
PNA		 7606
7607 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
19c28b13
PNA		 7608 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7609 NFNETLINK_V0, nft_base_seq(net));
7610 if (!nlh)
3b49e2e9
PNA		 7611 goto nla_put_failure;
7612
3b49e2e9
PNA		 7613 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7614 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
3ecbfd65
HS		 7615 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7616 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8bb69f3b
PNA		 7617 NFTA_FLOWTABLE_PAD) ||
7618 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
3b49e2e9
PNA		 7619 goto nla_put_failure;
7620
ae0be8de 7621 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
eb895086
KL		 7622 if (!nest)
7623 goto nla_put_failure;
3b49e2e9 7624 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
71a8a63b 7625 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
3b49e2e9
PNA		 7626 goto nla_put_failure;
7627
ae0be8de 7628 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
3b49e2e9
PNA		 7629 if (!nest_devs)
7630 goto nla_put_failure;
7631
c42d8bda 7632 list_for_each_entry_rcu(hook, hook_list, list) {
3f0465a9 7633 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
3b49e2e9
PNA		 7634 goto nla_put_failure;
7635 }
7636 nla_nest_end(skb, nest_devs);
7637 nla_nest_end(skb, nest);
7638
7639 nlmsg_end(skb, nlh);
7640 return 0;
7641
7642nla_put_failure:
7643 nlmsg_trim(skb, nlh);
7644 return -1;
7645}
7646
7647struct nft_flowtable_filter {
7648 char *table;
7649};
7650
7651static int nf_tables_dump_flowtable(struct sk_buff *skb,
7652 struct netlink_callback *cb)
7653{
7654 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7655 struct nft_flowtable_filter *filter = cb->data;
7656 unsigned int idx = 0, s_idx = cb->args[0];
7657 struct net *net = sock_net(skb->sk);
7658 int family = nfmsg->nfgen_family;
7659 struct nft_flowtable *flowtable;
0854db2a 7660 struct nftables_pernet *nft_net;
3b49e2e9
PNA		 7661 const struct nft_table *table;
7662
7663 rcu_read_lock();
d59d2f82 7664 nft_net = nft_pernet(net);
0854db2a 7665 cb->seq = nft_net->base_seq;
3b49e2e9 7666
0854db2a 7667 list_for_each_entry_rcu(table, &nft_net->tables, list) {
98319cb9 7668 if (family != NFPROTO_UNSPEC && family != table->family)
3b49e2e9
PNA		 7669 continue;
7670
36596dad
PNA		 7671 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7672 if (!nft_is_active(net, flowtable))
7673 goto cont;
7674 if (idx < s_idx)
7675 goto cont;
7676 if (idx > s_idx)
7677 memset(&cb->args[1], 0,
7678 sizeof(cb->args) - sizeof(cb->args[0]));
360cc79d 7679 if (filter && filter->table &&
36596dad
PNA		 7680 strcmp(filter->table, table->name))
7681 goto cont;
3b49e2e9 7682
36596dad
PNA		 7683 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7684 cb->nlh->nlmsg_seq,
7685 NFT_MSG_NEWFLOWTABLE,
7686 NLM_F_MULTI | NLM_F_APPEND,
c42d8bda
PNA		 7687 table->family,
7688 flowtable,
7689 &flowtable->hook_list) < 0)
36596dad 7690 goto done;
3b49e2e9 7691
36596dad 7692 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3b49e2e9 7693cont:
36596dad 7694 idx++;
3b49e2e9
PNA		 7695 }
7696 }
7697done:
7698 rcu_read_unlock();
7699
7700 cb->args[0] = idx;
7701 return skb->len;
7702}
7703
90fd131a 7704static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
3b49e2e9 7705{
90fd131a
FW		 7706 const struct nlattr * const *nla = cb->data;
7707 struct nft_flowtable_filter *filter = NULL;
3b49e2e9 7708
90fd131a
FW		 7709 if (nla[NFTA_FLOWTABLE_TABLE]) {
7710 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7711 if (!filter)
7712 return -ENOMEM;
3b49e2e9 7713
90fd131a
FW		 7714 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7715 GFP_ATOMIC);
7716 if (!filter->table) {
7717 kfree(filter);
7718 return -ENOMEM;
7719 }
7720 }
3b49e2e9 7721
90fd131a 7722 cb->data = filter;
3b49e2e9
PNA		 7723 return 0;
7724}
7725
90fd131a 7726static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
3b49e2e9 7727{
90fd131a 7728 struct nft_flowtable_filter *filter = cb->data;
3b49e2e9 7729
3b49e2e9 7730 if (!filter)
90fd131a 7731 return 0;
3b49e2e9 7732
90fd131a
FW		 7733 kfree(filter->table);
7734 kfree(filter);
7735
7736 return 0;
3b49e2e9
PNA		 7737}
7738
d9adf22a 7739/* called with rcu_read_lock held */
797d4980
PNA		 7740static int nf_tables_getflowtable(struct sk_buff *skb,
7741 const struct nfnl_info *info,
7742 const struct nlattr * const nla[])
3b49e2e9 7743{
797d4980 7744 u8 genmask = nft_genmask_cur(info->net);
ef4b65e5 7745 u8 family = info->nfmsg->nfgen_family;
3b49e2e9 7746 struct nft_flowtable *flowtable;
3b49e2e9 7747 const struct nft_table *table;
797d4980 7748 struct net *net = info->net;
3b49e2e9
PNA		 7749 struct sk_buff *skb2;
7750 int err;
7751
797d4980 7752 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3b49e2e9 7753 struct netlink_dump_control c = {
90fd131a 7754 .start = nf_tables_dump_flowtable_start,
3b49e2e9
PNA		 7755 .dump = nf_tables_dump_flowtable,
7756 .done = nf_tables_dump_flowtable_done,
d9adf22a 7757 .module = THIS_MODULE,
90fd131a 7758 .data = (void *)nla,
3b49e2e9
PNA		 7759 };
7760
797d4980 7761 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3b49e2e9
PNA		 7762 }
7763
7764 if (!nla[NFTA_FLOWTABLE_NAME])
7765 return -EINVAL;
7766
cac20fcd 7767 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6001a930 7768 genmask, 0);
3b49e2e9
PNA		 7769 if (IS_ERR(table))
7770 return PTR_ERR(table);
7771
cac20fcd
PNA		 7772 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7773 genmask);
03a0120f 7774 if (IS_ERR(flowtable))
3b49e2e9
PNA		 7775 return PTR_ERR(flowtable);
7776
d9adf22a 7777 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3b49e2e9
PNA		 7778 if (!skb2)
7779 return -ENOMEM;
7780
7781 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
797d4980 7782 info->nlh->nlmsg_seq,
3b49e2e9 7783 NFT_MSG_NEWFLOWTABLE, 0, family,
c42d8bda 7784 flowtable, &flowtable->hook_list);
3b49e2e9 7785 if (err < 0)
ee921183 7786 goto err_fill_flowtable_info;
3b49e2e9 7787
ee921183
PNA		 7788 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7789
7790err_fill_flowtable_info:
3b49e2e9
PNA		 7791 kfree_skb(skb2);
7792 return err;
7793}
7794
7795static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7796 struct nft_flowtable *flowtable,
c42d8bda 7797 struct list_head *hook_list,
3b49e2e9
PNA		 7798 int event)
7799{
d59d2f82 7800 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3b49e2e9 7801 struct sk_buff *skb;
6fb721cf 7802 u16 flags = 0;
3b49e2e9
PNA		 7803 int err;
7804
dceababa 7805 if (!ctx->report &&
3b49e2e9
PNA		 7806 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7807 return;
7808
7809 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7810 if (skb == NULL)
7811 goto err;
7812
6fb721cf
PNA		 7813 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
7814 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
7815
3b49e2e9 7816 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
6fb721cf 7817 ctx->seq, event, flags,
c42d8bda 7818 ctx->family, flowtable, hook_list);
3b49e2e9
PNA		 7819 if (err < 0) {
7820 kfree_skb(skb);
7821 goto err;
7822 }
7823
0854db2a 7824 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3b49e2e9
PNA		 7825 return;
7826err:
7827 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7828}
7829
3b49e2e9
PNA		 7830static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7831{
3f0465a9
PNA		 7832 struct nft_hook *hook, *next;
7833
5acab914 7834 flowtable->data.type->free(&flowtable->data);
3f0465a9 7835 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
5acab914
PNA		 7836 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7837 FLOW_BLOCK_UNBIND);
3f0465a9
PNA		 7838 list_del_rcu(&hook->list);
7839 kfree(hook);
7840 }
3b49e2e9 7841 kfree(flowtable->name);
3b49e2e9 7842 module_put(flowtable->data.type->owner);
a12486eb 7843 kfree(flowtable);
3b49e2e9
PNA		 7844}
7845
84d7fce6
PNA		 7846static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7847 u32 portid, u32 seq)
7848{
d59d2f82 7849 struct nftables_pernet *nft_net = nft_pernet(net);
84d7fce6 7850 struct nlmsghdr *nlh;
784b4e61 7851 char buf[TASK_COMM_LEN];
dedb67c4 7852 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
84d7fce6 7853
19c28b13
PNA		 7854 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
7855 NFNETLINK_V0, nft_base_seq(net));
7856 if (!nlh)
84d7fce6
PNA		 7857 goto nla_put_failure;
7858
0854db2a 7859 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
784b4e61
PS		 7860 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7861 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
84d7fce6
PNA		 7862 goto nla_put_failure;
7863
053c095a
JB		 7864 nlmsg_end(skb, nlh);
7865 return 0;
84d7fce6
PNA		 7866
7867nla_put_failure:
7868 nlmsg_trim(skb, nlh);
7869 return -EMSGSIZE;
7870}
7871
3b49e2e9
PNA		 7872static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7873 struct nft_flowtable *flowtable)
7874{
3f0465a9 7875 struct nft_hook *hook;
3b49e2e9 7876
3f0465a9
PNA		 7877 list_for_each_entry(hook, &flowtable->hook_list, list) {
7878 if (hook->ops.dev != dev)
3b49e2e9
PNA		 7879 continue;
7880
5acab914 7881 /* flow_offload_netdev_event() cleans up entries for us. */
ff4bf2f4 7882 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
3f0465a9
PNA		 7883 list_del_rcu(&hook->list);
7884 kfree_rcu(hook, rcu);
3b49e2e9
PNA		 7885 break;
7886 }
7887}
7888
7889static int nf_tables_flowtable_event(struct notifier_block *this,
7890 unsigned long event, void *ptr)
7891{
7892 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7893 struct nft_flowtable *flowtable;
0854db2a 7894 struct nftables_pernet *nft_net;
3b49e2e9 7895 struct nft_table *table;
0a2cf5ee 7896 struct net *net;
3b49e2e9
PNA		 7897
7898 if (event != NETDEV_UNREGISTER)
7899 return 0;
7900
6a48de01 7901 net = dev_net(dev);
d59d2f82 7902 nft_net = nft_pernet(net);
0854db2a
FW		 7903 mutex_lock(&nft_net->commit_mutex);
7904 list_for_each_entry(table, &nft_net->tables, list) {
36596dad
PNA		 7905 list_for_each_entry(flowtable, &table->flowtables, list) {
7906 nft_flowtable_event(event, dev, flowtable);
3b49e2e9
PNA		 7907 }
7908 }
0854db2a 7909 mutex_unlock(&nft_net->commit_mutex);
6a48de01 7910
3b49e2e9
PNA		 7911 return NOTIFY_DONE;
7912}
7913
7914static struct notifier_block nf_tables_flowtable_notifier = {
7915 .notifier_call = nf_tables_flowtable_event,
7916};
7917
25e94a99
PNA		 7918static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
7919 int event)
84d7fce6
PNA		 7920{
7921 struct nlmsghdr *nlh = nlmsg_hdr(skb);
7922 struct sk_buff *skb2;
7923 int err;
7924
dceababa 7925 if (!nlmsg_report(nlh) &&
84d7fce6 7926 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 7927 return;
84d7fce6 7928
84d7fce6
PNA		 7929 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7930 if (skb2 == NULL)
7931 goto err;
7932
7933 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7934 nlh->nlmsg_seq);
7935 if (err < 0) {
7936 kfree_skb(skb2);
7937 goto err;
7938 }
7939
25e94a99
PNA		 7940 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7941 nlmsg_report(nlh), GFP_KERNEL);
7942 return;
84d7fce6 7943err:
25e94a99
PNA		 7944 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7945 -ENOBUFS);
84d7fce6
PNA		 7946}
7947
797d4980
PNA		 7948static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
7949 const struct nlattr * const nla[])
84d7fce6 7950{
84d7fce6
PNA		 7951 struct sk_buff *skb2;
7952 int err;
7953
d9adf22a 7954 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
84d7fce6
PNA		 7955 if (skb2 == NULL)
7956 return -ENOMEM;
7957
797d4980
PNA		 7958 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
7959 info->nlh->nlmsg_seq);
84d7fce6 7960 if (err < 0)
ee921183 7961 goto err_fill_gen_info;
84d7fce6 7962
797d4980 7963 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
ee921183
PNA		 7964
7965err_fill_gen_info:
84d7fce6
PNA		 7966 kfree_skb(skb2);
7967 return err;
7968}
7969
96518518
PM		 7970static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
7971 [NFT_MSG_NEWTABLE] = {
50f2db9e
PNA		 7972 .call = nf_tables_newtable,
7973 .type = NFNL_CB_BATCH,
96518518
PM		 7974 .attr_count = NFTA_TABLE_MAX,
7975 .policy = nft_table_policy,
7976 },
7977 [NFT_MSG_GETTABLE] = {
50f2db9e
PNA		 7978 .call = nf_tables_gettable,
7979 .type = NFNL_CB_RCU,
96518518
PM		 7980 .attr_count = NFTA_TABLE_MAX,
7981 .policy = nft_table_policy,
7982 },
7983 [NFT_MSG_DELTABLE] = {
50f2db9e
PNA		 7984 .call = nf_tables_deltable,
7985 .type = NFNL_CB_BATCH,
96518518
PM		 7986 .attr_count = NFTA_TABLE_MAX,
7987 .policy = nft_table_policy,
7988 },
7989 [NFT_MSG_NEWCHAIN] = {
50f2db9e
PNA		 7990 .call = nf_tables_newchain,
7991 .type = NFNL_CB_BATCH,
96518518
PM		 7992 .attr_count = NFTA_CHAIN_MAX,
7993 .policy = nft_chain_policy,
7994 },
7995 [NFT_MSG_GETCHAIN] = {
50f2db9e
PNA		 7996 .call = nf_tables_getchain,
7997 .type = NFNL_CB_RCU,
96518518
PM		 7998 .attr_count = NFTA_CHAIN_MAX,
7999 .policy = nft_chain_policy,
8000 },
8001 [NFT_MSG_DELCHAIN] = {
50f2db9e
PNA		 8002 .call = nf_tables_delchain,
8003 .type = NFNL_CB_BATCH,
96518518
PM		 8004 .attr_count = NFTA_CHAIN_MAX,
8005 .policy = nft_chain_policy,
8006 },
8007 [NFT_MSG_NEWRULE] = {
50f2db9e
PNA		 8008 .call = nf_tables_newrule,
8009 .type = NFNL_CB_BATCH,
96518518
PM		 8010 .attr_count = NFTA_RULE_MAX,
8011 .policy = nft_rule_policy,
8012 },
8013 [NFT_MSG_GETRULE] = {
50f2db9e
PNA		 8014 .call = nf_tables_getrule,
8015 .type = NFNL_CB_RCU,
96518518
PM		 8016 .attr_count = NFTA_RULE_MAX,
8017 .policy = nft_rule_policy,
8018 },
8019 [NFT_MSG_DELRULE] = {
50f2db9e
PNA		 8020 .call = nf_tables_delrule,
8021 .type = NFNL_CB_BATCH,
96518518
PM		 8022 .attr_count = NFTA_RULE_MAX,
8023 .policy = nft_rule_policy,
8024 },
20a69341 8025 [NFT_MSG_NEWSET] = {
50f2db9e
PNA		 8026 .call = nf_tables_newset,
8027 .type = NFNL_CB_BATCH,
20a69341
PM		 8028 .attr_count = NFTA_SET_MAX,
8029 .policy = nft_set_policy,
8030 },
8031 [NFT_MSG_GETSET] = {
50f2db9e
PNA		 8032 .call = nf_tables_getset,
8033 .type = NFNL_CB_RCU,
20a69341
PM		 8034 .attr_count = NFTA_SET_MAX,
8035 .policy = nft_set_policy,
8036 },
8037 [NFT_MSG_DELSET] = {
50f2db9e
PNA		 8038 .call = nf_tables_delset,
8039 .type = NFNL_CB_BATCH,
20a69341
PM		 8040 .attr_count = NFTA_SET_MAX,
8041 .policy = nft_set_policy,
8042 },
8043 [NFT_MSG_NEWSETELEM] = {
50f2db9e
PNA		 8044 .call = nf_tables_newsetelem,
8045 .type = NFNL_CB_BATCH,
20a69341
PM		 8046 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8047 .policy = nft_set_elem_list_policy,
8048 },
8049 [NFT_MSG_GETSETELEM] = {
50f2db9e
PNA		 8050 .call = nf_tables_getsetelem,
8051 .type = NFNL_CB_RCU,
20a69341
PM		 8052 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8053 .policy = nft_set_elem_list_policy,
8054 },
8055 [NFT_MSG_DELSETELEM] = {
50f2db9e
PNA		 8056 .call = nf_tables_delsetelem,
8057 .type = NFNL_CB_BATCH,
20a69341
PM		 8058 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8059 .policy = nft_set_elem_list_policy,
8060 },
84d7fce6 8061 [NFT_MSG_GETGEN] = {
50f2db9e
PNA		 8062 .call = nf_tables_getgen,
8063 .type = NFNL_CB_RCU,
84d7fce6 8064 },
e5009240 8065 [NFT_MSG_NEWOBJ] = {
50f2db9e
PNA		 8066 .call = nf_tables_newobj,
8067 .type = NFNL_CB_BATCH,
e5009240
PNA		 8068 .attr_count = NFTA_OBJ_MAX,
8069 .policy = nft_obj_policy,
8070 },
8071 [NFT_MSG_GETOBJ] = {
50f2db9e
PNA		 8072 .call = nf_tables_getobj,
8073 .type = NFNL_CB_RCU,
e5009240
PNA		 8074 .attr_count = NFTA_OBJ_MAX,
8075 .policy = nft_obj_policy,
8076 },
8077 [NFT_MSG_DELOBJ] = {
50f2db9e
PNA		 8078 .call = nf_tables_delobj,
8079 .type = NFNL_CB_BATCH,
e5009240
PNA		 8080 .attr_count = NFTA_OBJ_MAX,
8081 .policy = nft_obj_policy,
8082 },
43da04a5 8083 [NFT_MSG_GETOBJ_RESET] = {
50f2db9e
PNA		 8084 .call = nf_tables_getobj,
8085 .type = NFNL_CB_RCU,
43da04a5
PNA		 8086 .attr_count = NFTA_OBJ_MAX,
8087 .policy = nft_obj_policy,
8088 },
3b49e2e9 8089 [NFT_MSG_NEWFLOWTABLE] = {
50f2db9e
PNA		 8090 .call = nf_tables_newflowtable,
8091 .type = NFNL_CB_BATCH,
3b49e2e9
PNA		 8092 .attr_count = NFTA_FLOWTABLE_MAX,
8093 .policy = nft_flowtable_policy,
8094 },
8095 [NFT_MSG_GETFLOWTABLE] = {
50f2db9e
PNA		 8096 .call = nf_tables_getflowtable,
8097 .type = NFNL_CB_RCU,
3b49e2e9
PNA		 8098 .attr_count = NFTA_FLOWTABLE_MAX,
8099 .policy = nft_flowtable_policy,
8100 },
8101 [NFT_MSG_DELFLOWTABLE] = {
50f2db9e
PNA		 8102 .call = nf_tables_delflowtable,
8103 .type = NFNL_CB_BATCH,
3b49e2e9
PNA		 8104 .attr_count = NFTA_FLOWTABLE_MAX,
8105 .policy = nft_flowtable_policy,
8106 },
96518518
PM		 8107};
8108
a654de8f
PNA		 8109static int nf_tables_validate(struct net *net)
8110{
d59d2f82 8111 struct nftables_pernet *nft_net = nft_pernet(net);
a654de8f
PNA		 8112 struct nft_table *table;
8113
0854db2a 8114 switch (nft_net->validate_state) {
a654de8f
PNA		 8115 case NFT_VALIDATE_SKIP:
8116 break;
8117 case NFT_VALIDATE_NEED:
8118 nft_validate_state_update(net, NFT_VALIDATE_DO);
954d8297 8119 fallthrough;
a654de8f 8120 case NFT_VALIDATE_DO:
0854db2a 8121 list_for_each_entry(table, &nft_net->tables, list) {
a654de8f
PNA		 8122 if (nft_table_validate(net, table) < 0)
8123 return -EAGAIN;
8124 }
8125 break;
8126 }
8127
8128 return 0;
8129}
8130
66293c46
FW		 8131/* a drop policy has to be deferred until all rules have been activated,
8132 * otherwise a large ruleset that contains a drop-policy base chain will
8133 * cause all packets to get dropped until the full transaction has been
8134 * processed.
8135 *
8136 * We defer the drop policy until the transaction has been finalized.
8137 */
8138static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8139{
8140 struct nft_base_chain *basechain;
8141
8142 if (nft_trans_chain_policy(trans) != NF_DROP)
8143 return;
8144
8145 if (!nft_is_base_chain(trans->ctx.chain))
8146 return;
8147
8148 basechain = nft_base_chain(trans->ctx.chain);
8149 basechain->policy = NF_DROP;
8150}
8151
91c7b38d
PNA		 8152static void nft_chain_commit_update(struct nft_trans *trans)
8153{
8154 struct nft_base_chain *basechain;
8155
1b2470e5
FW		 8156 if (nft_trans_chain_name(trans)) {
8157 rhltable_remove(&trans->ctx.table->chains_ht,
8158 &trans->ctx.chain->rhlhead,
8159 nft_chain_ht_params);
d71efb59 8160 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
1b2470e5
FW		 8161 rhltable_insert_key(&trans->ctx.table->chains_ht,
8162 trans->ctx.chain->name,
8163 &trans->ctx.chain->rhlhead,
8164 nft_chain_ht_params);
8165 }
91c7b38d 8166
f323d954 8167 if (!nft_is_base_chain(trans->ctx.chain))
91c7b38d
PNA		 8168 return;
8169
53315ac6
FW		 8170 nft_chain_stats_replace(trans);
8171
91c7b38d 8172 basechain = nft_base_chain(trans->ctx.chain);
91c7b38d
PNA		 8173
8174 switch (nft_trans_chain_policy(trans)) {
8175 case NF_DROP:
8176 case NF_ACCEPT:
8177 basechain->policy = nft_trans_chain_policy(trans);
8178 break;
8179 }
8180}
8181
d62d0ba9
FFM		 8182static void nft_obj_commit_update(struct nft_trans *trans)
8183{
8184 struct nft_object *newobj;
8185 struct nft_object *obj;
8186
8187 obj = nft_trans_obj(trans);
8188 newobj = nft_trans_obj_newobj(trans);
8189
9fedd894
FFM		 8190 if (obj->ops->update)
8191 obj->ops->update(obj, newobj);
d62d0ba9 8192
dad3bdee 8193 nft_obj_destroy(&trans->ctx, newobj);
d62d0ba9
FFM		 8194}
8195
2f99aa31 8196static void nft_commit_release(struct nft_trans *trans)
c7c32e72 8197{
c7c32e72
PNA		 8198 switch (trans->msg_type) {
8199 case NFT_MSG_DELTABLE:
8200 nf_tables_table_destroy(&trans->ctx);
8201 break;
9f8aac0b 8202 case NFT_MSG_NEWCHAIN:
53315ac6 8203 free_percpu(nft_trans_chain_stats(trans));
9f8aac0b
FW		 8204 kfree(nft_trans_chain_name(trans));
8205 break;
c7c32e72 8206 case NFT_MSG_DELCHAIN:
43a605f2 8207 nf_tables_chain_destroy(&trans->ctx);
c7c32e72
PNA		 8208 break;
8209 case NFT_MSG_DELRULE:
8210 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8211 break;
8212 case NFT_MSG_DELSET:
0c2a85ed 8213 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
c7c32e72 8214 break;
61edafbb 8215 case NFT_MSG_DELSETELEM:
3453c927
PNA		 8216 nf_tables_set_elem_destroy(&trans->ctx,
8217 nft_trans_elem_set(trans),
59105446 8218 nft_trans_elem(trans).priv);
61edafbb 8219 break;
e5009240 8220 case NFT_MSG_DELOBJ:
00bfb320 8221 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
e5009240 8222 break;
3b49e2e9 8223 case NFT_MSG_DELFLOWTABLE:
abadb2f8
PNA		 8224 if (nft_trans_flowtable_update(trans))
8225 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8226 else
8227 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
3b49e2e9 8228 break;
c7c32e72 8229 }
0935d558
FW		 8230
8231 if (trans->put_net)
8232 put_net(trans->ctx.net);
8233
c7c32e72
PNA		 8234 kfree(trans);
8235}
8236
0935d558 8237static void nf_tables_trans_destroy_work(struct work_struct *w)
2f99aa31
FW		 8238{
8239 struct nft_trans *trans, *next;
0935d558
FW		 8240 LIST_HEAD(head);
8241
8242 spin_lock(&nf_tables_destroy_list_lock);
8243 list_splice_init(&nf_tables_destroy_list, &head);
8244 spin_unlock(&nf_tables_destroy_list_lock);
2f99aa31 8245
0935d558 8246 if (list_empty(&head))
2f99aa31
FW		 8247 return;
8248
8249 synchronize_rcu();
8250
0935d558 8251 list_for_each_entry_safe(trans, next, &head, list) {
2f99aa31
FW		 8252 list_del(&trans->list);
8253 nft_commit_release(trans);
8254 }
8255}
8256
ffe8923f
FW		 8257void nf_tables_trans_destroy_flush_work(void)
8258{
8259 flush_work(&trans_destroy_work);
8260}
8261EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8262
ed5f85d4
PNA		 8263static bool nft_expr_reduce(struct nft_regs_track *track,
8264 const struct nft_expr *expr)
8265{
8266 return false;
8267}
8268
0cbc06b3
FW		 8269static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8270{
2c865a8a 8271 const struct nft_expr *expr, *last;
12e4ecfa 8272 struct nft_regs_track track = {};
2c865a8a
PNA		 8273 unsigned int size, data_size;
8274 void *data, *data_boundary;
8275 struct nft_rule_dp *prule;
0cbc06b3 8276 struct nft_rule *rule;
0cbc06b3
FW		 8277
8278 /* already handled or inactive chain? */
2c865a8a 8279 if (chain->blob_next || !nft_is_active_next(net, chain))
0cbc06b3
FW		 8280 return 0;
8281
8282 rule = list_entry(&chain->rules, struct nft_rule, list);
0cbc06b3 8283
63045bfd 8284 data_size = 0;
0cbc06b3 8285 list_for_each_entry_continue(rule, &chain->rules, list) {
2c865a8a
PNA		 8286 if (nft_is_active_next(net, rule)) {
8287 data_size += sizeof(*prule) + rule->dlen;
8288 if (data_size > INT_MAX)
8289 return -ENOMEM;
8290 }
0cbc06b3 8291 }
2c865a8a 8292 data_size += offsetof(struct nft_rule_dp, data); /* last rule */
0cbc06b3 8293
2c865a8a
PNA		 8294 chain->blob_next = nf_tables_chain_alloc_rules(data_size);
8295 if (!chain->blob_next)
0cbc06b3
FW		 8296 return -ENOMEM;
8297
2c865a8a
PNA		 8298 data = (void *)chain->blob_next->data;
8299 data_boundary = data + data_size;
8300 size = 0;
8301
0cbc06b3 8302 list_for_each_entry_continue(rule, &chain->rules, list) {
2c865a8a
PNA		 8303 if (!nft_is_active_next(net, rule))
8304 continue;
8305
8306 prule = (struct nft_rule_dp *)data;
8307 data += offsetof(struct nft_rule_dp, data);
8308 if (WARN_ON_ONCE(data > data_boundary))
8309 return -ENOMEM;
8310
12e4ecfa 8311 size = 0;
fe75e84a 8312 track.last = nft_expr_last(rule);
2c865a8a 8313 nft_rule_for_each_expr(expr, last, rule) {
12e4ecfa
PNA		 8314 track.cur = expr;
8315
ed5f85d4 8316 if (nft_expr_reduce(&track, expr)) {
12e4ecfa
PNA		 8317 expr = track.cur;
8318 continue;
8319 }
8320
2c865a8a
PNA		 8321 if (WARN_ON_ONCE(data + expr->ops->size > data_boundary))
8322 return -ENOMEM;
8323
8324 memcpy(data + size, expr, expr->ops->size);
8325 size += expr->ops->size;
8326 }
8327 if (WARN_ON_ONCE(size >= 1 << 12))
8328 return -ENOMEM;
8329
8330 prule->handle = rule->handle;
8331 prule->dlen = size;
8332 prule->is_last = 0;
8333
8334 data += size;
8335 size = 0;
8336 chain->blob_next->size += (unsigned long)(data - (void *)prule);
0cbc06b3
FW		 8337 }
8338
2c865a8a
PNA		 8339 prule = (struct nft_rule_dp *)data;
8340 data += offsetof(struct nft_rule_dp, data);
8341 if (WARN_ON_ONCE(data > data_boundary))
8342 return -ENOMEM;
8343
8344 nft_last_rule(chain->blob_next, prule);
8345
0cbc06b3
FW		 8346 return 0;
8347}
8348
8349static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8350{
d59d2f82 8351 struct nftables_pernet *nft_net = nft_pernet(net);
0cbc06b3
FW		 8352 struct nft_trans *trans, *next;
8353
0854db2a 8354 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
0cbc06b3
FW		 8355 struct nft_chain *chain = trans->ctx.chain;
8356
8357 if (trans->msg_type == NFT_MSG_NEWRULE ||
8358 trans->msg_type == NFT_MSG_DELRULE) {
2c865a8a
PNA		 8359 kvfree(chain->blob_next);
8360 chain->blob_next = NULL;
0cbc06b3
FW		 8361 }
8362 }
8363}
8364
8365static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8366{
8367 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8368
2c865a8a 8369 kvfree(o->blob);
0cbc06b3
FW		 8370}
8371
2c865a8a 8372static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
0cbc06b3 8373{
0cbc06b3
FW		 8374 struct nft_rules_old *old;
8375
2c865a8a
PNA		 8376 /* rcu_head is after end marker */
8377 old = (void *)blob + sizeof(*blob) + blob->size;
8378 old->blob = blob;
0cbc06b3
FW		 8379
8380 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8381}
8382
0fb39bbe 8383static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
0cbc06b3 8384{
2c865a8a 8385 struct nft_rule_blob *g0, *g1;
0cbc06b3
FW		 8386 bool next_genbit;
8387
8388 next_genbit = nft_gencursor_next(net);
8389
2c865a8a 8390 g0 = rcu_dereference_protected(chain->blob_gen_0,
f102d66b 8391 lockdep_commit_lock_is_held(net));
2c865a8a 8392 g1 = rcu_dereference_protected(chain->blob_gen_1,
f102d66b 8393 lockdep_commit_lock_is_held(net));
0cbc06b3
FW		 8394
8395 /* No changes to this chain? */
2c865a8a 8396 if (chain->blob_next == NULL) {
0cbc06b3
FW		 8397 /* chain had no change in last or next generation */
8398 if (g0 == g1)
8399 return;
8400 /*
8401 * chain had no change in this generation; make sure next
8402 * one uses same rules as current generation.
8403 */
8404 if (next_genbit) {
2c865a8a 8405 rcu_assign_pointer(chain->blob_gen_1, g0);
0cbc06b3
FW		 8406 nf_tables_commit_chain_free_rules_old(g1);
8407 } else {
2c865a8a 8408 rcu_assign_pointer(chain->blob_gen_0, g1);
0cbc06b3
FW		 8409 nf_tables_commit_chain_free_rules_old(g0);
8410 }
8411
8412 return;
8413 }
8414
8415 if (next_genbit)
2c865a8a 8416 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
0cbc06b3 8417 else
2c865a8a 8418 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
0cbc06b3 8419
2c865a8a 8420 chain->blob_next = NULL;
0cbc06b3
FW		 8421
8422 if (g0 == g1)
8423 return;
8424
8425 if (next_genbit)
8426 nf_tables_commit_chain_free_rules_old(g1);
8427 else
8428 nf_tables_commit_chain_free_rules_old(g0);
8429}
8430
d152159b
FW		 8431static void nft_obj_del(struct nft_object *obj)
8432{
4d44175a 8433 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
d152159b
FW		 8434 list_del_rcu(&obj->list);
8435}
8436
d0e2c7de 8437void nft_chain_del(struct nft_chain *chain)
1b2470e5
FW		 8438{
8439 struct nft_table *table = chain->table;
8440
8441 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8442 nft_chain_ht_params));
8443 list_del_rcu(&chain->list);
8444}
8445
abadb2f8
PNA		 8446static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
8447 struct list_head *hook_list)
8448{
8449 struct nft_hook *hook, *next;
8450
8451 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8452 if (hook->inactive)
8453 list_move(&hook->list, hook_list);
8454 }
8455}
8456
eb014de4
PNA		 8457static void nf_tables_module_autoload_cleanup(struct net *net)
8458{
d59d2f82 8459 struct nftables_pernet *nft_net = nft_pernet(net);
eb014de4
PNA		 8460 struct nft_module_request *req, *next;
8461
0854db2a
FW		 8462 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8463 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
eb014de4
PNA		 8464 WARN_ON_ONCE(!req->done);
8465 list_del(&req->list);
8466 kfree(req);
8467 }
8468}
8469
0935d558
FW		 8470static void nf_tables_commit_release(struct net *net)
8471{
d59d2f82 8472 struct nftables_pernet *nft_net = nft_pernet(net);
0935d558
FW		 8473 struct nft_trans *trans;
8474
8475 /* all side effects have to be made visible.
8476 * For example, if a chain named 'foo' has been deleted, a
8477 * new transaction must not find it anymore.
8478 *
8479 * Memory reclaim happens asynchronously from work queue
8480 * to prevent expensive synchronize_rcu() in commit phase.
8481 */
0854db2a 8482 if (list_empty(&nft_net->commit_list)) {
eb014de4 8483 nf_tables_module_autoload_cleanup(net);
0854db2a 8484 mutex_unlock(&nft_net->commit_mutex);
0935d558
FW		 8485 return;
8486 }
8487
0854db2a 8488 trans = list_last_entry(&nft_net->commit_list,
0935d558
FW		 8489 struct nft_trans, list);
8490 get_net(trans->ctx.net);
8491 WARN_ON_ONCE(trans->put_net);
8492
8493 trans->put_net = true;
8494 spin_lock(&nf_tables_destroy_list_lock);
0854db2a 8495 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
0935d558
FW		 8496 spin_unlock(&nf_tables_destroy_list_lock);
8497
eb014de4 8498 nf_tables_module_autoload_cleanup(net);
0935d558 8499 schedule_work(&trans_destroy_work);
ffe8923f 8500
0854db2a 8501 mutex_unlock(&nft_net->commit_mutex);
0935d558
FW		 8502}
8503
67cc570e
PNA		 8504static void nft_commit_notify(struct net *net, u32 portid)
8505{
d59d2f82 8506 struct nftables_pernet *nft_net = nft_pernet(net);
67cc570e
PNA		 8507 struct sk_buff *batch_skb = NULL, *nskb, *skb;
8508 unsigned char *data;
8509 int len;
8510
0854db2a 8511 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
67cc570e
PNA		 8512 if (!batch_skb) {
8513new_batch:
8514 batch_skb = skb;
8515 len = NLMSG_GOODSIZE - skb->len;
8516 list_del(&skb->list);
8517 continue;
8518 }
8519 len -= skb->len;
8520 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8521 data = skb_put(batch_skb, skb->len);
8522 memcpy(data, skb->data, skb->len);
8523 list_del(&skb->list);
8524 kfree_skb(skb);
8525 continue;
8526 }
8527 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8528 NFT_CB(batch_skb).report, GFP_KERNEL);
8529 goto new_batch;
8530 }
8531
8532 if (batch_skb) {
8533 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8534 NFT_CB(batch_skb).report, GFP_KERNEL);
8535 }
8536
0854db2a 8537 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
67cc570e
PNA		 8538}
8539
c520292f
RGB		 8540static int nf_tables_commit_audit_alloc(struct list_head *adl,
8541 struct nft_table *table)
8542{
8543 struct nft_audit_data *adp;
8544
8545 list_for_each_entry(adp, adl, list) {
8546 if (adp->table == table)
8547 return 0;
8548 }
8549 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
8550 if (!adp)
8551 return -ENOMEM;
8552 adp->table = table;
8553 list_add(&adp->list, adl);
8554 return 0;
8555}
8556
cfbe3650
DM		 8557static void nf_tables_commit_audit_free(struct list_head *adl)
8558{
8559 struct nft_audit_data *adp, *adn;
8560
8561 list_for_each_entry_safe(adp, adn, adl, list) {
8562 list_del(&adp->list);
8563 kfree(adp);
8564 }
8565}
8566
c520292f
RGB		 8567static void nf_tables_commit_audit_collect(struct list_head *adl,
8568 struct nft_table *table, u32 op)
8569{
8570 struct nft_audit_data *adp;
8571
8572 list_for_each_entry(adp, adl, list) {
8573 if (adp->table == table)
8574 goto found;
8575 }
dadf33c9 8576 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
c520292f
RGB		 8577 return;
8578found:
8579 adp->entries++;
8580 if (!adp->op || adp->op > op)
8581 adp->op = op;
8582}
8583
8584#define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
8585
8586static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
8587{
8588 struct nft_audit_data *adp, *adn;
8589 char aubuf[AUNFTABLENAMELEN];
8590
8591 list_for_each_entry_safe(adp, adn, adl, list) {
8592 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
8593 generation);
8594 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
8595 nft2audit_op[adp->op], GFP_KERNEL);
8596 list_del(&adp->list);
8597 kfree(adp);
8598 }
8599}
8600
5913beaf 8601static int nf_tables_commit(struct net *net, struct sk_buff *skb)
37082f93 8602{
d59d2f82 8603 struct nftables_pernet *nft_net = nft_pernet(net);
37082f93 8604 struct nft_trans *trans, *next;
a3716e70 8605 struct nft_trans_elem *te;
0cbc06b3
FW		 8606 struct nft_chain *chain;
8607 struct nft_table *table;
c520292f 8608 LIST_HEAD(adl);
c9626a2c 8609 int err;
37082f93 8610
0854db2a
FW		 8611 if (list_empty(&nft_net->commit_list)) {
8612 mutex_unlock(&nft_net->commit_mutex);
b8b27498
FW		 8613 return 0;
8614 }
8615
a654de8f
PNA		 8616 /* 0. Validate ruleset, otherwise roll back for error reporting. */
8617 if (nf_tables_validate(net) < 0)
8618 return -EAGAIN;
8619
c9626a2c
PNA		 8620 err = nft_flow_rule_offload_commit(net);
8621 if (err < 0)
8622 return err;
8623
0cbc06b3 8624 /* 1. Allocate space for next generation rules_gen_X[] */
0854db2a 8625 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
0cbc06b3 8626 int ret;
37082f93 8627
c520292f
RGB		 8628 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
8629 if (ret) {
8630 nf_tables_commit_chain_prepare_cancel(net);
cfbe3650 8631 nf_tables_commit_audit_free(&adl);
c520292f
RGB		 8632 return ret;
8633 }
0cbc06b3
FW		 8634 if (trans->msg_type == NFT_MSG_NEWRULE ||
8635 trans->msg_type == NFT_MSG_DELRULE) {
8636 chain = trans->ctx.chain;
8637
8638 ret = nf_tables_commit_chain_prepare(net, chain);
8639 if (ret < 0) {
8640 nf_tables_commit_chain_prepare_cancel(net);
cfbe3650 8641 nf_tables_commit_audit_free(&adl);
0cbc06b3
FW		 8642 return ret;
8643 }
8644 }
8645 }
37082f93 8646
0cbc06b3 8647 /* step 2. Make rules_gen_X visible to packet path */
0854db2a 8648 list_for_each_entry(table, &nft_net->tables, list) {
0fb39bbe
FW		 8649 list_for_each_entry(chain, &table->chains, list)
8650 nf_tables_commit_chain(net, chain);
0cbc06b3
FW		 8651 }
8652
8653 /*
8654 * Bump generation counter, invalidate any dump in progress.
8655 * Cannot fail after this point.
37082f93 8656 */
0854db2a
FW		 8657 while (++nft_net->base_seq == 0)
8658 ;
0cbc06b3
FW		 8659
8660 /* step 3. Start new generation, rules_gen_X now in use. */
8661 net->nft.gencursor = nft_gencursor_next(net);
37082f93 8662
0854db2a 8663 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
c520292f
RGB		 8664 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
8665 trans->msg_type);
b380e5c7 8666 switch (trans->msg_type) {
55dd6f93
PNA		 8667 case NFT_MSG_NEWTABLE:
8668 if (nft_trans_table_update(trans)) {
179d9ba5
PNA		 8669 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8670 nft_trans_destroy(trans);
8671 break;
8672 }
8673 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
0ce7cf41
PNA		 8674 nf_tables_table_disable(net, trans->ctx.table);
8675
179d9ba5 8676 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
55dd6f93 8677 } else {
f2a6d766 8678 nft_clear(net, trans->ctx.table);
55dd6f93 8679 }
35151d84 8680 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
55dd6f93
PNA		 8681 nft_trans_destroy(trans);
8682 break;
8683 case NFT_MSG_DELTABLE:
f2a6d766 8684 list_del_rcu(&trans->ctx.table->list);
35151d84 8685 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
55dd6f93 8686 break;
91c7b38d 8687 case NFT_MSG_NEWCHAIN:
9f8aac0b 8688 if (nft_trans_chain_update(trans)) {
91c7b38d 8689 nft_chain_commit_update(trans);
9f8aac0b
FW		 8690 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8691 /* trans destroyed after rcu grace period */
8692 } else {
66293c46 8693 nft_chain_commit_drop_policy(trans);
664b0f8c 8694 nft_clear(net, trans->ctx.chain);
9f8aac0b
FW		 8695 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8696 nft_trans_destroy(trans);
8697 }
91c7b38d
PNA		 8698 break;
8699 case NFT_MSG_DELCHAIN:
1b2470e5 8700 nft_chain_del(trans->ctx.chain);
35151d84 8701 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
c974a3a3
PNA		 8702 nf_tables_unregister_hook(trans->ctx.net,
8703 trans->ctx.table,
8704 trans->ctx.chain);
91c7b38d 8705 break;
b380e5c7 8706 case NFT_MSG_NEWRULE:
889f7ee7 8707 nft_clear(trans->ctx.net, nft_trans_rule(trans));
35151d84 8708 nf_tables_rule_notify(&trans->ctx,
37082f93 8709 nft_trans_rule(trans),
35151d84 8710 NFT_MSG_NEWRULE);
37082f93 8711 nft_trans_destroy(trans);
b380e5c7
PNA		 8712 break;
8713 case NFT_MSG_DELRULE:
8714 list_del_rcu(&nft_trans_rule(trans)->list);
35151d84
PNA		 8715 nf_tables_rule_notify(&trans->ctx,
8716 nft_trans_rule(trans),
8717 NFT_MSG_DELRULE);
f6ac8585
PNA		 8718 nft_rule_expr_deactivate(&trans->ctx,
8719 nft_trans_rule(trans),
8720 NFT_TRANS_COMMIT);
b380e5c7 8721 break;
958bee14 8722 case NFT_MSG_NEWSET:
37a9cc52 8723 nft_clear(net, nft_trans_set(trans));
4fefee57
PNA		 8724 /* This avoids hitting -EBUSY when deleting the table
8725 * from the transaction.
8726 */
408070d6 8727 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
4fefee57
PNA		 8728 !list_empty(&nft_trans_set(trans)->bindings))
8729 trans->ctx.table->use--;
8730
958bee14 8731 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 8732 NFT_MSG_NEWSET, GFP_KERNEL);
958bee14
PNA		 8733 nft_trans_destroy(trans);
8734 break;
8735 case NFT_MSG_DELSET:
37a9cc52 8736 list_del_rcu(&nft_trans_set(trans)->list);
958bee14 8737 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 8738 NFT_MSG_DELSET, GFP_KERNEL);
958bee14 8739 break;
60319eb1 8740 case NFT_MSG_NEWSETELEM:
cc02e457
PM		 8741 te = (struct nft_trans_elem *)trans->data;
8742
aaa31047 8743 nft_setelem_activate(net, te->set, &te->elem);
cc02e457
PM		 8744 nf_tables_setelem_notify(&trans->ctx, te->set,
8745 &te->elem,
6fb721cf 8746 NFT_MSG_NEWSETELEM);
60319eb1
PNA		 8747 nft_trans_destroy(trans);
8748 break;
8749 case NFT_MSG_DELSETELEM:
a3716e70 8750 te = (struct nft_trans_elem *)trans->data;
fe2811eb 8751
a3716e70
PNA		 8752 nf_tables_setelem_notify(&trans->ctx, te->set,
8753 &te->elem,
6fb721cf 8754 NFT_MSG_DELSETELEM);
aaa31047
PNA		 8755 nft_setelem_remove(net, te->set, &te->elem);
8756 if (!nft_setelem_is_catchall(te->set, &te->elem)) {
8757 atomic_dec(&te->set->nelems);
8758 te->set->ndeact--;
8759 }
60319eb1 8760 break;
e5009240 8761 case NFT_MSG_NEWOBJ:
d62d0ba9
FFM		 8762 if (nft_trans_obj_update(trans)) {
8763 nft_obj_commit_update(trans);
8764 nf_tables_obj_notify(&trans->ctx,
8765 nft_trans_obj(trans),
8766 NFT_MSG_NEWOBJ);
8767 } else {
8768 nft_clear(net, nft_trans_obj(trans));
8769 nf_tables_obj_notify(&trans->ctx,
8770 nft_trans_obj(trans),
8771 NFT_MSG_NEWOBJ);
8772 nft_trans_destroy(trans);
8773 }
e5009240
PNA		 8774 break;
8775 case NFT_MSG_DELOBJ:
d152159b 8776 nft_obj_del(nft_trans_obj(trans));
e5009240
PNA		 8777 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8778 NFT_MSG_DELOBJ);
8779 break;
3b49e2e9 8780 case NFT_MSG_NEWFLOWTABLE:
78d9f48f 8781 if (nft_trans_flowtable_update(trans)) {
7b35582c
PNA		 8782 nft_trans_flowtable(trans)->data.flags =
8783 nft_trans_flowtable_flags(trans);
78d9f48f
PNA		 8784 nf_tables_flowtable_notify(&trans->ctx,
8785 nft_trans_flowtable(trans),
8786 &nft_trans_flowtable_hooks(trans),
8787 NFT_MSG_NEWFLOWTABLE);
8788 list_splice(&nft_trans_flowtable_hooks(trans),
8789 &nft_trans_flowtable(trans)->hook_list);
8790 } else {
8791 nft_clear(net, nft_trans_flowtable(trans));
8792 nf_tables_flowtable_notify(&trans->ctx,
8793 nft_trans_flowtable(trans),
8794 &nft_trans_flowtable(trans)->hook_list,
8795 NFT_MSG_NEWFLOWTABLE);
8796 }
3b49e2e9
PNA		 8797 nft_trans_destroy(trans);
8798 break;
8799 case NFT_MSG_DELFLOWTABLE:
abadb2f8
PNA		 8800 if (nft_trans_flowtable_update(trans)) {
8801 nft_flowtable_hooks_del(nft_trans_flowtable(trans),
8802 &nft_trans_flowtable_hooks(trans));
8803 nf_tables_flowtable_notify(&trans->ctx,
8804 nft_trans_flowtable(trans),
8805 &nft_trans_flowtable_hooks(trans),
8806 NFT_MSG_DELFLOWTABLE);
8807 nft_unregister_flowtable_net_hooks(net,
8808 &nft_trans_flowtable_hooks(trans));
8809 } else {
8810 list_del_rcu(&nft_trans_flowtable(trans)->list);
8811 nf_tables_flowtable_notify(&trans->ctx,
8812 nft_trans_flowtable(trans),
8813 &nft_trans_flowtable(trans)->hook_list,
8814 NFT_MSG_DELFLOWTABLE);
8815 nft_unregister_flowtable_net_hooks(net,
8816 &nft_trans_flowtable(trans)->hook_list);
8817 }
3b49e2e9 8818 break;
37082f93 8819 }
37082f93
PNA		 8820 }
8821
67cc570e 8822 nft_commit_notify(net, NETLINK_CB(skb).portid);
84d7fce6 8823 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
0854db2a 8824 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
0935d558 8825 nf_tables_commit_release(net);
37082f93
PNA		 8826
8827 return 0;
8828}
8829
eb014de4
PNA		 8830static void nf_tables_module_autoload(struct net *net)
8831{
d59d2f82 8832 struct nftables_pernet *nft_net = nft_pernet(net);
eb014de4
PNA		 8833 struct nft_module_request *req, *next;
8834 LIST_HEAD(module_list);
8835
0854db2a
FW		 8836 list_splice_init(&nft_net->module_list, &module_list);
8837 mutex_unlock(&nft_net->commit_mutex);
eb014de4 8838 list_for_each_entry_safe(req, next, &module_list, list) {
1d305ba4
FW		 8839 request_module("%s", req->module);
8840 req->done = true;
eb014de4 8841 }
0854db2a
FW		 8842 mutex_lock(&nft_net->commit_mutex);
8843 list_splice(&module_list, &nft_net->module_list);
eb014de4
PNA		 8844}
8845
b326dd37 8846static void nf_tables_abort_release(struct nft_trans *trans)
c7c32e72 8847{
c7c32e72
PNA		 8848 switch (trans->msg_type) {
8849 case NFT_MSG_NEWTABLE:
8850 nf_tables_table_destroy(&trans->ctx);
8851 break;
8852 case NFT_MSG_NEWCHAIN:
43a605f2 8853 nf_tables_chain_destroy(&trans->ctx);
c7c32e72
PNA		 8854 break;
8855 case NFT_MSG_NEWRULE:
8856 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8857 break;
8858 case NFT_MSG_NEWSET:
0c2a85ed 8859 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
c7c32e72 8860 break;
61edafbb
PM		 8861 case NFT_MSG_NEWSETELEM:
8862 nft_set_elem_destroy(nft_trans_elem_set(trans),
61f9e292 8863 nft_trans_elem(trans).priv, true);
61edafbb 8864 break;
e5009240 8865 case NFT_MSG_NEWOBJ:
00bfb320 8866 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
e5009240 8867 break;
3b49e2e9 8868 case NFT_MSG_NEWFLOWTABLE:
78d9f48f
PNA		 8869 if (nft_trans_flowtable_update(trans))
8870 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8871 else
8872 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
3b49e2e9 8873 break;
c7c32e72
PNA		 8874 }
8875 kfree(trans);
8876}
8877
c0391b6a 8878static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
37082f93 8879{
d59d2f82 8880 struct nftables_pernet *nft_net = nft_pernet(net);
37082f93 8881 struct nft_trans *trans, *next;
02263db0 8882 struct nft_trans_elem *te;
abadb2f8 8883 struct nft_hook *hook;
37082f93 8884
c0391b6a
PNA		 8885 if (action == NFNL_ABORT_VALIDATE &&
8886 nf_tables_validate(net) < 0)
8887 return -EAGAIN;
8888
0854db2a 8889 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
a907e36d 8890 list) {
b380e5c7 8891 switch (trans->msg_type) {
55dd6f93
PNA		 8892 case NFT_MSG_NEWTABLE:
8893 if (nft_trans_table_update(trans)) {
179d9ba5
PNA		 8894 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8895 nft_trans_destroy(trans);
8896 break;
8897 }
8898 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
0ce7cf41 8899 nf_tables_table_disable(net, trans->ctx.table);
179d9ba5
PNA		 8900 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8901 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
8902 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
8903 }
8904 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
55dd6f93
PNA		 8905 nft_trans_destroy(trans);
8906 } else {
e688a7f8 8907 list_del_rcu(&trans->ctx.table->list);
55dd6f93
PNA		 8908 }
8909 break;
8910 case NFT_MSG_DELTABLE:
f2a6d766 8911 nft_clear(trans->ctx.net, trans->ctx.table);
55dd6f93
PNA		 8912 nft_trans_destroy(trans);
8913 break;
91c7b38d
PNA		 8914 case NFT_MSG_NEWCHAIN:
8915 if (nft_trans_chain_update(trans)) {
982f4051 8916 free_percpu(nft_trans_chain_stats(trans));
9f8aac0b 8917 kfree(nft_trans_chain_name(trans));
91c7b38d
PNA		 8918 nft_trans_destroy(trans);
8919 } else {
d0e2c7de
PNA		 8920 if (nft_chain_is_bound(trans->ctx.chain)) {
8921 nft_trans_destroy(trans);
8922 break;
8923 }
4fefee57 8924 trans->ctx.table->use--;
1b2470e5 8925 nft_chain_del(trans->ctx.chain);
c974a3a3
PNA		 8926 nf_tables_unregister_hook(trans->ctx.net,
8927 trans->ctx.table,
8928 trans->ctx.chain);
91c7b38d
PNA		 8929 }
8930 break;
8931 case NFT_MSG_DELCHAIN:
4fefee57 8932 trans->ctx.table->use++;
664b0f8c 8933 nft_clear(trans->ctx.net, trans->ctx.chain);
91c7b38d
PNA		 8934 nft_trans_destroy(trans);
8935 break;
b380e5c7 8936 case NFT_MSG_NEWRULE:
4fefee57 8937 trans->ctx.chain->use--;
b380e5c7 8938 list_del_rcu(&nft_trans_rule(trans)->list);
f6ac8585
PNA		 8939 nft_rule_expr_deactivate(&trans->ctx,
8940 nft_trans_rule(trans),
8941 NFT_TRANS_ABORT);
3c5e4462
PNA		 8942 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8943 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
b380e5c7
PNA		 8944 break;
8945 case NFT_MSG_DELRULE:
4fefee57 8946 trans->ctx.chain->use++;
889f7ee7 8947 nft_clear(trans->ctx.net, nft_trans_rule(trans));
bb7b40ae 8948 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
3c5e4462
PNA		 8949 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8950 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8951
37082f93 8952 nft_trans_destroy(trans);
b380e5c7 8953 break;
958bee14 8954 case NFT_MSG_NEWSET:
4fefee57 8955 trans->ctx.table->use--;
6a0a8d10 8956 if (nft_trans_set_bound(trans)) {
40ba1d9b
PNA		 8957 nft_trans_destroy(trans);
8958 break;
8959 }
8960 list_del_rcu(&nft_trans_set(trans)->list);
958bee14
PNA		 8961 break;
8962 case NFT_MSG_DELSET:
4fefee57 8963 trans->ctx.table->use++;
37a9cc52 8964 nft_clear(trans->ctx.net, nft_trans_set(trans));
958bee14
PNA		 8965 nft_trans_destroy(trans);
8966 break;
60319eb1 8967 case NFT_MSG_NEWSETELEM:
6a0a8d10 8968 if (nft_trans_elem_set_bound(trans)) {
40ba1d9b
PNA		 8969 nft_trans_destroy(trans);
8970 break;
8971 }
02263db0 8972 te = (struct nft_trans_elem *)trans->data;
aaa31047
PNA		 8973 nft_setelem_remove(net, te->set, &te->elem);
8974 if (!nft_setelem_is_catchall(te->set, &te->elem))
8975 atomic_dec(&te->set->nelems);
60319eb1
PNA		 8976 break;
8977 case NFT_MSG_DELSETELEM:
cc02e457
PM		 8978 te = (struct nft_trans_elem *)trans->data;
8979
f8bb7889 8980 nft_setelem_data_activate(net, te->set, &te->elem);
aaa31047
PNA		 8981 nft_setelem_activate(net, te->set, &te->elem);
8982 if (!nft_setelem_is_catchall(te->set, &te->elem))
8983 te->set->ndeact--;
cc02e457 8984
e5009240
PNA		 8985 nft_trans_destroy(trans);
8986 break;
8987 case NFT_MSG_NEWOBJ:
d62d0ba9 8988 if (nft_trans_obj_update(trans)) {
dad3bdee 8989 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
d62d0ba9
FFM		 8990 nft_trans_destroy(trans);
8991 } else {
8992 trans->ctx.table->use--;
8993 nft_obj_del(nft_trans_obj(trans));
8994 }
e5009240
PNA		 8995 break;
8996 case NFT_MSG_DELOBJ:
8997 trans->ctx.table->use++;
8998 nft_clear(trans->ctx.net, nft_trans_obj(trans));
60319eb1
PNA		 8999 nft_trans_destroy(trans);
9000 break;
3b49e2e9 9001 case NFT_MSG_NEWFLOWTABLE:
78d9f48f
PNA		 9002 if (nft_trans_flowtable_update(trans)) {
9003 nft_unregister_flowtable_net_hooks(net,
9004 &nft_trans_flowtable_hooks(trans));
9005 } else {
9006 trans->ctx.table->use--;
9007 list_del_rcu(&nft_trans_flowtable(trans)->list);
9008 nft_unregister_flowtable_net_hooks(net,
9009 &nft_trans_flowtable(trans)->hook_list);
9010 }
3b49e2e9
PNA		 9011 break;
9012 case NFT_MSG_DELFLOWTABLE:
abadb2f8
PNA		 9013 if (nft_trans_flowtable_update(trans)) {
9014 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
9015 hook->inactive = false;
9016 } else {
9017 trans->ctx.table->use++;
9018 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9019 }
3b49e2e9
PNA		 9020 nft_trans_destroy(trans);
9021 break;
37082f93 9022 }
37082f93
PNA		 9023 }
9024
b326dd37
PNA		 9025 synchronize_rcu();
9026
a1cee076 9027 list_for_each_entry_safe_reverse(trans, next,
0854db2a 9028 &nft_net->commit_list, list) {
c7c32e72 9029 list_del(&trans->list);
b326dd37 9030 nf_tables_abort_release(trans);
37082f93
PNA		 9031 }
9032
c0391b6a 9033 if (action == NFNL_ABORT_AUTOLOAD)
eb014de4
PNA		 9034 nf_tables_module_autoload(net);
9035 else
9036 nf_tables_module_autoload_cleanup(net);
9037
37082f93
PNA		 9038 return 0;
9039}
9040
a654de8f
PNA		 9041static void nf_tables_cleanup(struct net *net)
9042{
9043 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
9044}
9045
c0391b6a
PNA		 9046static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9047 enum nfnl_abort_action action)
71ad00c5 9048{
d59d2f82 9049 struct nftables_pernet *nft_net = nft_pernet(net);
c0391b6a 9050 int ret = __nf_tables_abort(net, action);
f102d66b 9051
0854db2a 9052 mutex_unlock(&nft_net->commit_mutex);
f102d66b
FW		 9053
9054 return ret;
71ad00c5
FW		 9055}
9056
74e8bcd2
PNA		 9057static bool nf_tables_valid_genid(struct net *net, u32 genid)
9058{
d59d2f82 9059 struct nftables_pernet *nft_net = nft_pernet(net);
f102d66b
FW		 9060 bool genid_ok;
9061
0854db2a 9062 mutex_lock(&nft_net->commit_mutex);
f102d66b 9063
0854db2a 9064 genid_ok = genid == 0 || nft_net->base_seq == genid;
f102d66b 9065 if (!genid_ok)
0854db2a 9066 mutex_unlock(&nft_net->commit_mutex);
f102d66b
FW		 9067
9068 /* else, commit mutex has to be released by commit or abort function */
9069 return genid_ok;
74e8bcd2
PNA		 9070}
9071
96518518
PM		 9072static const struct nfnetlink_subsystem nf_tables_subsys = {
9073 .name = "nf_tables",
9074 .subsys_id = NFNL_SUBSYS_NFTABLES,
9075 .cb_count = NFT_MSG_MAX,
9076 .cb = nf_tables_cb,
0628b123
PNA		 9077 .commit = nf_tables_commit,
9078 .abort = nf_tables_abort,
a654de8f 9079 .cleanup = nf_tables_cleanup,
74e8bcd2 9080 .valid_genid = nf_tables_valid_genid,
be2ab5b4 9081 .owner = THIS_MODULE,
96518518
PM		 9082};
9083
7210e4e3 9084int nft_chain_validate_dependency(const struct nft_chain *chain,
32537e91 9085 enum nft_chain_types type)
7210e4e3
PNA		 9086{
9087 const struct nft_base_chain *basechain;
9088
f323d954 9089 if (nft_is_base_chain(chain)) {
7210e4e3
PNA		 9090 basechain = nft_base_chain(chain);
9091 if (basechain->type->type != type)
9092 return -EOPNOTSUPP;
9093 }
9094 return 0;
9095}
9096EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9097
75e8d06d
PNA		 9098int nft_chain_validate_hooks(const struct nft_chain *chain,
9099 unsigned int hook_flags)
9100{
9101 struct nft_base_chain *basechain;
9102
f323d954 9103 if (nft_is_base_chain(chain)) {
75e8d06d
PNA		 9104 basechain = nft_base_chain(chain);
9105
c974a3a3 9106 if ((1 << basechain->ops.hooknum) & hook_flags)
75e8d06d
PNA		 9107 return 0;
9108
9109 return -EOPNOTSUPP;
9110 }
9111
9112 return 0;
9113}
9114EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9115
20a69341
PM		 9116/*
9117 * Loop detection - walk through the ruleset beginning at the destination chain
9118 * of a new jump until either the source chain is reached (loop) or all
9119 * reachable chains have been traversed.
9120 *
9121 * The loop check is performed whenever a new jump verdict is added to an
9122 * expression or verdict map or a verdict map is bound to a new chain.
9123 */
9124
9125static int nf_tables_check_loops(const struct nft_ctx *ctx,
9126 const struct nft_chain *chain);
9127
6387aa6e
PNA		 9128static int nft_check_loops(const struct nft_ctx *ctx,
9129 const struct nft_set_ext *ext)
9130{
9131 const struct nft_data *data;
9132 int ret;
9133
9134 data = nft_set_ext_data(ext);
9135 switch (data->verdict.code) {
9136 case NFT_JUMP:
9137 case NFT_GOTO:
9138 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9139 break;
9140 default:
9141 ret = 0;
9142 break;
9143 }
9144
9145 return ret;
9146}
9147
20a69341 9148static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
de70185d 9149 struct nft_set *set,
20a69341 9150 const struct nft_set_iter *iter,
de70185d 9151 struct nft_set_elem *elem)
20a69341 9152{
fe2811eb 9153 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
fe2811eb
PM		 9154
9155 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9156 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
62f9c8b4
PNA		 9157 return 0;
9158
6387aa6e 9159 return nft_check_loops(ctx, ext);
20a69341
PM		 9160}
9161
aaa31047
PNA		 9162static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9163 struct nft_set *set)
9164{
9165 u8 genmask = nft_genmask_next(ctx->net);
9166 struct nft_set_elem_catchall *catchall;
9167 struct nft_set_ext *ext;
9168 int ret = 0;
9169
9170 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9171 ext = nft_set_elem_ext(set, catchall->elem);
9172 if (!nft_set_elem_active(ext, genmask))
9173 continue;
9174
9175 ret = nft_check_loops(ctx, ext);
9176 if (ret < 0)
9177 return ret;
9178 }
9179
9180 return ret;
9181}
9182
20a69341
PM		 9183static int nf_tables_check_loops(const struct nft_ctx *ctx,
9184 const struct nft_chain *chain)
9185{
9186 const struct nft_rule *rule;
9187 const struct nft_expr *expr, *last;
de70185d 9188 struct nft_set *set;
20a69341
PM		 9189 struct nft_set_binding *binding;
9190 struct nft_set_iter iter;
20a69341
PM		 9191
9192 if (ctx->chain == chain)
9193 return -ELOOP;
9194
9195 list_for_each_entry(rule, &chain->rules, list) {
9196 nft_rule_for_each_expr(expr, last, rule) {
a654de8f
PNA		 9197 struct nft_immediate_expr *priv;
9198 const struct nft_data *data;
0ca743a5
PNA		 9199 int err;
9200
a654de8f 9201 if (strcmp(expr->ops->type->name, "immediate"))
20a69341
PM		 9202 continue;
9203
a654de8f
PNA		 9204 priv = nft_expr_priv(expr);
9205 if (priv->dreg != NFT_REG_VERDICT)
0ca743a5 9206 continue;
20a69341 9207
a654de8f 9208 data = &priv->data;
1ca2e170 9209 switch (data->verdict.code) {
20a69341
PM		 9210 case NFT_JUMP:
9211 case NFT_GOTO:
1ca2e170
PM		 9212 err = nf_tables_check_loops(ctx,
9213 data->verdict.chain);
20a69341
PM		 9214 if (err < 0)
9215 return err;
c2168e6b 9216 break;
20a69341
PM		 9217 default:
9218 break;
9219 }
9220 }
9221 }
9222
9223 list_for_each_entry(set, &ctx->table->sets, list) {
37a9cc52
PNA		 9224 if (!nft_is_active_next(ctx->net, set))
9225 continue;
20a69341
PM		 9226 if (!(set->flags & NFT_SET_MAP) ||
9227 set->dtype != NFT_DATA_VERDICT)
9228 continue;
9229
9230 list_for_each_entry(binding, &set->bindings, list) {
11113e19
PM		 9231 if (!(binding->flags & NFT_SET_MAP) ||
9232 binding->chain != chain)
20a69341
PM		 9233 continue;
9234
8588ac09 9235 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 9236 iter.skip = 0;
9237 iter.count = 0;
9238 iter.err = 0;
9239 iter.fn = nf_tables_loop_check_setelem;
9240
9241 set->ops->walk(ctx, set, &iter);
aaa31047
PNA		 9242 if (!iter.err)
9243 iter.err = nft_set_catchall_loops(ctx, set);
9244
20a69341
PM		 9245 if (iter.err < 0)
9246 return iter.err;
9247 }
9248 }
9249
9250 return 0;
9251}
9252
36b701fa
LGL		 9253/**
9254 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
9255 *
9256 * @attr: netlink attribute to fetch value from
9257 * @max: maximum value to be stored in dest
9258 * @dest: pointer to the variable
9259 *
9260 * Parse, check and store a given u32 netlink attribute into variable.
9261 * This function returns -ERANGE if the value goes over maximum value.
9262 * Otherwise a 0 is returned and the attribute value is stored in the
9263 * destination variable.
9264 */
f1d505bb 9265int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
36b701fa 9266{
09525a09 9267 u32 val;
36b701fa
LGL		 9268
9269 val = ntohl(nla_get_be32(attr));
9270 if (val > max)
9271 return -ERANGE;
9272
9273 *dest = val;
9274 return 0;
9275}
9276EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9277
08a01c11 9278static unsigned int nft_parse_register(const struct nlattr *attr)
b1c96ed3 9279{
49499c3e
PM		 9280 unsigned int reg;
9281
9282 reg = ntohl(nla_get_be32(attr));
9283 switch (reg) {
9284 case NFT_REG_VERDICT...NFT_REG_4:
9285 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9286 default:
9287 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9288 }
b1c96ed3 9289}
b1c96ed3 9290
49499c3e
PM		 9291/**
9292 * nft_dump_register - dump a register value to a netlink attribute
9293 *
9294 * @skb: socket buffer
9295 * @attr: attribute number
9296 * @reg: register number
9297 *
9298 * Construct a netlink attribute containing the register number. For
9299 * compatibility reasons, register numbers being a multiple of 4 are
9300 * translated to the corresponding 128 bit register numbers.
9301 */
b1c96ed3
PM		 9302int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9303{
49499c3e
PM		 9304 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9305 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9306 else
9307 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9308
b1c96ed3
PM		 9309 return nla_put_be32(skb, attr, htonl(reg));
9310}
9311EXPORT_SYMBOL_GPL(nft_dump_register);
9312
4f16d25c 9313static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
96518518 9314{
49499c3e 9315 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
96518518 9316 return -EINVAL;
d07db988
PM		 9317 if (len == 0)
9318 return -EINVAL;
c593642c 9319 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
d07db988 9320 return -ERANGE;
49499c3e 9321
96518518
PM		 9322 return 0;
9323}
4f16d25c
PNA		 9324
9325int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9326{
9327 u32 reg;
9328 int err;
9329
9330 reg = nft_parse_register(attr);
9331 err = nft_validate_register_load(reg, len);
9332 if (err < 0)
9333 return err;
9334
9335 *sreg = reg;
9336 return 0;
9337}
9338EXPORT_SYMBOL_GPL(nft_parse_register_load);
96518518 9339
345023b0
PNA		 9340static int nft_validate_register_store(const struct nft_ctx *ctx,
9341 enum nft_registers reg,
9342 const struct nft_data *data,
9343 enum nft_data_types type,
9344 unsigned int len)
96518518 9345{
20a69341
PM		 9346 int err;
9347
96518518
PM		 9348 switch (reg) {
9349 case NFT_REG_VERDICT:
58f40ab6 9350 if (type != NFT_DATA_VERDICT)
96518518 9351 return -EINVAL;
20a69341 9352
58f40ab6 9353 if (data != NULL &&
1ca2e170
PM		 9354 (data->verdict.code == NFT_GOTO ||
9355 data->verdict.code == NFT_JUMP)) {
9356 err = nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 9357 if (err < 0)
9358 return err;
20a69341
PM		 9359 }
9360
96518518
PM		 9361 return 0;
9362 default:
49499c3e 9363 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
27e6d201 9364 return -EINVAL;
45d9bcda
PM		 9365 if (len == 0)
9366 return -EINVAL;
49499c3e 9367 if (reg * NFT_REG32_SIZE + len >
c593642c 9368 sizeof_field(struct nft_regs, data))
45d9bcda 9369 return -ERANGE;
27e6d201 9370
96518518
PM		 9371 if (data != NULL && type != NFT_DATA_VALUE)
9372 return -EINVAL;
9373 return 0;
9374 }
9375}
345023b0
PNA		 9376
9377int nft_parse_register_store(const struct nft_ctx *ctx,
9378 const struct nlattr *attr, u8 *dreg,
9379 const struct nft_data *data,
9380 enum nft_data_types type, unsigned int len)
9381{
9382 int err;
9383 u32 reg;
9384
9385 reg = nft_parse_register(attr);
9386 err = nft_validate_register_store(ctx, reg, data, type, len);
9387 if (err < 0)
9388 return err;
9389
9390 *dreg = reg;
9391 return 0;
9392}
9393EXPORT_SYMBOL_GPL(nft_parse_register_store);
96518518
PM		 9394
9395static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9396 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
9397 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
9398 .len = NFT_CHAIN_MAXNAMELEN - 1 },
51d70f18 9399 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
96518518
PM		 9400};
9401
9402static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9403 struct nft_data_desc *desc, const struct nlattr *nla)
9404{
664b0f8c 9405 u8 genmask = nft_genmask_next(ctx->net);
96518518
PM		 9406 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9407 struct nft_chain *chain;
9408 int err;
9409
8cb08174
JB		 9410 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9411 nft_verdict_policy, NULL);
96518518
PM		 9412 if (err < 0)
9413 return err;
9414
9415 if (!tb[NFTA_VERDICT_CODE])
9416 return -EINVAL;
1ca2e170 9417 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
96518518 9418
1ca2e170 9419 switch (data->verdict.code) {
e0abdadc 9420 default:
1ca2e170 9421 switch (data->verdict.code & NF_VERDICT_MASK) {
e0abdadc
PM		 9422 case NF_ACCEPT:
9423 case NF_DROP:
9424 case NF_QUEUE:
9425 break;
9426 default:
9427 return -EINVAL;
9428 }
954d8297 9429 fallthrough;
96518518
PM		 9430 case NFT_CONTINUE:
9431 case NFT_BREAK:
9432 case NFT_RETURN:
96518518
PM		 9433 break;
9434 case NFT_JUMP:
9435 case NFT_GOTO:
51d70f18
PNA		 9436 if (tb[NFTA_VERDICT_CHAIN]) {
9437 chain = nft_chain_lookup(ctx->net, ctx->table,
9438 tb[NFTA_VERDICT_CHAIN],
9439 genmask);
9440 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9441 chain = nft_chain_lookup_byid(ctx->net,
9442 tb[NFTA_VERDICT_CHAIN_ID]);
9443 if (IS_ERR(chain))
9444 return PTR_ERR(chain);
9445 } else {
96518518 9446 return -EINVAL;
51d70f18
PNA		 9447 }
9448
96518518
PM		 9449 if (IS_ERR(chain))
9450 return PTR_ERR(chain);
f323d954 9451 if (nft_is_base_chain(chain))
96518518
PM		 9452 return -EOPNOTSUPP;
9453
96518518 9454 chain->use++;
1ca2e170 9455 data->verdict.chain = chain;
96518518 9456 break;
96518518
PM		 9457 }
9458
4c4ed074 9459 desc->len = sizeof(data->verdict);
96518518
PM		 9460 desc->type = NFT_DATA_VERDICT;
9461 return 0;
9462}
9463
9464static void nft_verdict_uninit(const struct nft_data *data)
9465{
d0e2c7de
PNA		 9466 struct nft_chain *chain;
9467 struct nft_rule *rule;
9468
1ca2e170 9469 switch (data->verdict.code) {
96518518
PM		 9470 case NFT_JUMP:
9471 case NFT_GOTO:
d0e2c7de
PNA		 9472 chain = data->verdict.chain;
9473 chain->use--;
9474
9475 if (!nft_chain_is_bound(chain))
9476 break;
9477
9478 chain->table->use--;
9479 list_for_each_entry(rule, &chain->rules, list)
9480 chain->use--;
9481
9482 nft_chain_del(chain);
96518518
PM		 9483 break;
9484 }
9485}
9486
33d5a7b1 9487int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
96518518
PM		 9488{
9489 struct nlattr *nest;
9490
ae0be8de 9491 nest = nla_nest_start_noflag(skb, type);
96518518
PM		 9492 if (!nest)
9493 goto nla_put_failure;
9494
33d5a7b1 9495 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
96518518
PM		 9496 goto nla_put_failure;
9497
33d5a7b1 9498 switch (v->code) {
96518518
PM		 9499 case NFT_JUMP:
9500 case NFT_GOTO:
1ca2e170 9501 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
33d5a7b1 9502 v->chain->name))
96518518
PM		 9503 goto nla_put_failure;
9504 }
9505 nla_nest_end(skb, nest);
9506 return 0;
9507
9508nla_put_failure:
9509 return -1;
9510}
9511
d0a11fc3
PM		 9512static int nft_value_init(const struct nft_ctx *ctx,
9513 struct nft_data *data, unsigned int size,
96518518
PM		 9514 struct nft_data_desc *desc, const struct nlattr *nla)
9515{
9516 unsigned int len;
9517
9518 len = nla_len(nla);
9519 if (len == 0)
9520 return -EINVAL;
d0a11fc3 9521 if (len > size)
96518518
PM		 9522 return -EOVERFLOW;
9523
d0a11fc3 9524 nla_memcpy(data->data, nla, len);
96518518
PM		 9525 desc->type = NFT_DATA_VALUE;
9526 desc->len = len;
9527 return 0;
9528}
9529
9530static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
9531 unsigned int len)
9532{
9533 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
9534}
9535
9536static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
d0a11fc3 9537 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
96518518
PM		 9538 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
9539};
9540
9541/**
9542 * nft_data_init - parse nf_tables data netlink attributes
9543 *
9544 * @ctx: context of the expression using the data
9545 * @data: destination struct nft_data
d0a11fc3 9546 * @size: maximum data length
96518518
PM		 9547 * @desc: data description
9548 * @nla: netlink attribute containing data
9549 *
9550 * Parse the netlink data attributes and initialize a struct nft_data.
9551 * The type and length of data are returned in the data description.
9552 *
9553 * The caller can indicate that it only wants to accept data of type
9554 * NFT_DATA_VALUE by passing NULL for the ctx argument.
9555 */
d0a11fc3
PM		 9556int nft_data_init(const struct nft_ctx *ctx,
9557 struct nft_data *data, unsigned int size,
96518518
PM		 9558 struct nft_data_desc *desc, const struct nlattr *nla)
9559{
9560 struct nlattr *tb[NFTA_DATA_MAX + 1];
9561 int err;
9562
8cb08174
JB		 9563 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
9564 nft_data_policy, NULL);
96518518
PM		 9565 if (err < 0)
9566 return err;
9567
9568 if (tb[NFTA_DATA_VALUE])
d0a11fc3
PM		 9569 return nft_value_init(ctx, data, size, desc,
9570 tb[NFTA_DATA_VALUE]);
96518518
PM		 9571 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
9572 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
9573 return -EINVAL;
9574}
9575EXPORT_SYMBOL_GPL(nft_data_init);
9576
9577/**
59105446 9578 * nft_data_release - release a nft_data item
96518518
PM		 9579 *
9580 * @data: struct nft_data to release
9581 * @type: type of data
9582 *
9583 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
9584 * all others need to be released by calling this function.
9585 */
59105446 9586void nft_data_release(const struct nft_data *data, enum nft_data_types type)
96518518 9587{
960bd2c2 9588 if (type < NFT_DATA_VERDICT)
96518518 9589 return;
960bd2c2 9590 switch (type) {
96518518
PM		 9591 case NFT_DATA_VERDICT:
9592 return nft_verdict_uninit(data);
9593 default:
9594 WARN_ON(1);
9595 }
9596}
59105446 9597EXPORT_SYMBOL_GPL(nft_data_release);
96518518
PM		 9598
9599int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9600 enum nft_data_types type, unsigned int len)
9601{
9602 struct nlattr *nest;
9603 int err;
9604
ae0be8de 9605 nest = nla_nest_start_noflag(skb, attr);
96518518
PM		 9606 if (nest == NULL)
9607 return -1;
9608
9609 switch (type) {
9610 case NFT_DATA_VALUE:
9611 err = nft_value_dump(skb, data, len);
9612 break;
9613 case NFT_DATA_VERDICT:
33d5a7b1 9614 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
96518518
PM		 9615 break;
9616 default:
9617 err = -EINVAL;
9618 WARN_ON(1);
9619 }
9620
9621 nla_nest_end(skb, nest);
9622 return err;
9623}
9624EXPORT_SYMBOL_GPL(nft_data_dump);
9625
5ebe0b0e
PNA		 9626int __nft_release_basechain(struct nft_ctx *ctx)
9627{
9628 struct nft_rule *rule, *nr;
9629
fa5950e4
FW		 9630 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9631 return 0;
5ebe0b0e 9632
c974a3a3 9633 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
5ebe0b0e
PNA		 9634 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9635 list_del(&rule->list);
9636 ctx->chain->use--;
bb7b40ae 9637 nf_tables_rule_release(ctx, rule);
5ebe0b0e 9638 }
1b2470e5 9639 nft_chain_del(ctx->chain);
5ebe0b0e 9640 ctx->table->use--;
43a605f2 9641 nf_tables_chain_destroy(ctx);
5ebe0b0e
PNA		 9642
9643 return 0;
9644}
9645EXPORT_SYMBOL_GPL(__nft_release_basechain);
9646
00dfe9be
PNA		 9647static void __nft_release_hook(struct net *net, struct nft_table *table)
9648{
6069da44 9649 struct nft_flowtable *flowtable;
00dfe9be
PNA		 9650 struct nft_chain *chain;
9651
9652 list_for_each_entry(chain, &table->chains, list)
9653 nf_tables_unregister_hook(net, table, chain);
6069da44
PNA		 9654 list_for_each_entry(flowtable, &table->flowtables, list)
9655 nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list);
00dfe9be
PNA		 9656}
9657
767d1216
PNA		 9658static void __nft_release_hooks(struct net *net)
9659{
d59d2f82 9660 struct nftables_pernet *nft_net = nft_pernet(net);
767d1216 9661 struct nft_table *table;
767d1216 9662
0854db2a 9663 list_for_each_entry(table, &nft_net->tables, list) {
2888b080
PNA		 9664 if (nft_table_has_owner(table))
9665 continue;
9666
00dfe9be 9667 __nft_release_hook(net, table);
2888b080 9668 }
767d1216
PNA		 9669}
9670
fd020332 9671static void __nft_release_table(struct net *net, struct nft_table *table)
df05ef87 9672{
3b49e2e9 9673 struct nft_flowtable *flowtable, *nf;
df05ef87 9674 struct nft_chain *chain, *nc;
e5009240 9675 struct nft_object *obj, *ne;
df05ef87
PNA		 9676 struct nft_rule *rule, *nr;
9677 struct nft_set *set, *ns;
9678 struct nft_ctx ctx = {
9679 .net = net,
43a605f2 9680 .family = NFPROTO_NETDEV,
df05ef87
PNA		 9681 };
9682
fd020332
PNA		 9683 ctx.family = table->family;
9684 ctx.table = table;
9685 list_for_each_entry(chain, &table->chains, list) {
9686 ctx.chain = chain;
9687 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
9688 list_del(&rule->list);
9689 chain->use--;
9690 nf_tables_rule_release(&ctx, rule);
df05ef87 9691 }
df05ef87 9692 }
fd020332
PNA		 9693 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
9694 list_del(&flowtable->list);
9695 table->use--;
9696 nf_tables_flowtable_destroy(flowtable);
9697 }
9698 list_for_each_entry_safe(set, ns, &table->sets, list) {
9699 list_del(&set->list);
9700 table->use--;
9701 nft_set_destroy(&ctx, set);
9702 }
9703 list_for_each_entry_safe(obj, ne, &table->objects, list) {
9704 nft_obj_del(obj);
9705 table->use--;
9706 nft_obj_destroy(&ctx, obj);
9707 }
9708 list_for_each_entry_safe(chain, nc, &table->chains, list) {
9709 ctx.chain = chain;
9710 nft_chain_del(chain);
9711 table->use--;
9712 nf_tables_chain_destroy(&ctx);
9713 }
fd020332
PNA		 9714 nf_tables_table_destroy(&ctx);
9715}
9716
bd1777b3 9717static void __nft_release_tables(struct net *net)
fd020332 9718{
d59d2f82 9719 struct nftables_pernet *nft_net = nft_pernet(net);
fd020332
PNA		 9720 struct nft_table *table, *nt;
9721
0854db2a 9722 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
bd1777b3 9723 if (nft_table_has_owner(table))
6001a930
PNA		 9724 continue;
9725
a499b03b
FW		 9726 list_del(&table->list);
9727
fd020332 9728 __nft_release_table(net, table);
6001a930
PNA		 9729 }
9730}
9731
9732static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
9733 void *ptr)
9734{
a499b03b 9735 struct nft_table *table, *to_delete[8];
0854db2a 9736 struct nftables_pernet *nft_net;
6001a930 9737 struct netlink_notify *n = ptr;
6001a930 9738 struct net *net = n->net;
a499b03b
FW		 9739 unsigned int deleted;
9740 bool restart = false;
6001a930
PNA		 9741
9742 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
9743 return NOTIFY_DONE;
9744
d59d2f82 9745 nft_net = nft_pernet(net);
a499b03b 9746 deleted = 0;
0854db2a 9747 mutex_lock(&nft_net->commit_mutex);
a499b03b 9748again:
0854db2a 9749 list_for_each_entry(table, &nft_net->tables, list) {
6001a930
PNA		 9750 if (nft_table_has_owner(table) &&
9751 n->portid == table->nlpid) {
9752 __nft_release_hook(net, table);
a499b03b
FW		 9753 list_del_rcu(&table->list);
9754 to_delete[deleted++] = table;
9755 if (deleted >= ARRAY_SIZE(to_delete))
9756 break;
6001a930
PNA		 9757 }
9758 }
a499b03b
FW		 9759 if (deleted) {
9760 restart = deleted >= ARRAY_SIZE(to_delete);
6001a930 9761 synchronize_rcu();
a499b03b
FW		 9762 while (deleted)
9763 __nft_release_table(net, to_delete[--deleted]);
9764
9765 if (restart)
9766 goto again;
6001a930 9767 }
0854db2a 9768 mutex_unlock(&nft_net->commit_mutex);
6001a930
PNA		 9769
9770 return NOTIFY_DONE;
df05ef87
PNA		 9771}
9772
6001a930
PNA		 9773static struct notifier_block nft_nl_notifier = {
9774 .notifier_call = nft_rcv_nl_event,
9775};
9776
dd4cbef7
PNA		 9777static int __net_init nf_tables_init_net(struct net *net)
9778{
d59d2f82 9779 struct nftables_pernet *nft_net = nft_pernet(net);
0854db2a
FW		 9780
9781 INIT_LIST_HEAD(&nft_net->tables);
9782 INIT_LIST_HEAD(&nft_net->commit_list);
9783 INIT_LIST_HEAD(&nft_net->module_list);
9784 INIT_LIST_HEAD(&nft_net->notify_list);
9785 mutex_init(&nft_net->commit_mutex);
9786 nft_net->base_seq = 1;
9787 nft_net->validate_state = NFT_VALIDATE_SKIP;
a654de8f 9788
dd4cbef7
PNA		 9789 return 0;
9790}
9791
767d1216
PNA		 9792static void __net_exit nf_tables_pre_exit_net(struct net *net)
9793{
9794 __nft_release_hooks(net);
9795}
9796
dd4cbef7
PNA		 9797static void __net_exit nf_tables_exit_net(struct net *net)
9798{
d59d2f82 9799 struct nftables_pernet *nft_net = nft_pernet(net);
0854db2a
FW		 9800
9801 mutex_lock(&nft_net->commit_mutex);
9802 if (!list_empty(&nft_net->commit_list))
c0391b6a 9803 __nf_tables_abort(net, NFNL_ABORT_NONE);
bd1777b3 9804 __nft_release_tables(net);
0854db2a
FW		 9805 mutex_unlock(&nft_net->commit_mutex);
9806 WARN_ON_ONCE(!list_empty(&nft_net->tables));
9807 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
9808 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
dd4cbef7
PNA		 9809}
9810
99633ab2 9811static struct pernet_operations nf_tables_net_ops = {
767d1216
PNA		 9812 .init = nf_tables_init_net,
9813 .pre_exit = nf_tables_pre_exit_net,
9814 .exit = nf_tables_exit_net,
0854db2a
FW		 9815 .id = &nf_tables_net_id,
9816 .size = sizeof(struct nftables_pernet),
99633ab2
PNA		 9817};
9818
96518518
PM		 9819static int __init nf_tables_module_init(void)
9820{
9821 int err;
9822
d209df3e
FW		 9823 err = register_pernet_subsys(&nf_tables_net_ops);
9824 if (err < 0)
9825 return err;
9826
9827 err = nft_chain_filter_init();
9828 if (err < 0)
6001a930 9829 goto err_chain_filter;
02c7b25e 9830
96518518
PM		 9831 err = nf_tables_core_module_init();
9832 if (err < 0)
6001a930 9833 goto err_core_module;
96518518 9834
d209df3e 9835 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
96518518 9836 if (err < 0)
6001a930 9837 goto err_netdev_notifier;
96518518 9838
4d44175a
FW		 9839 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
9840 if (err < 0)
6001a930 9841 goto err_rht_objname;
4d44175a 9842
06d392cb 9843 err = nft_offload_init();
9844 if (err < 0)
6001a930
PNA		 9845 goto err_offload;
9846
9847 err = netlink_register_notifier(&nft_nl_notifier);
9848 if (err < 0)
9849 goto err_netlink_notifier;
06d392cb 9850
d209df3e
FW		 9851 /* must be last */
9852 err = nfnetlink_subsys_register(&nf_tables_subsys);
9853 if (err < 0)
6001a930 9854 goto err_nfnl_subsys;
3b49e2e9 9855
c1deb065 9856 nft_chain_route_init();
3474a2c6 9857
d209df3e 9858 return err;
6001a930
PNA		 9859
9860err_nfnl_subsys:
9861 netlink_unregister_notifier(&nft_nl_notifier);
9862err_netlink_notifier:
06d392cb 9863 nft_offload_exit();
6001a930 9864err_offload:
4d44175a 9865 rhltable_destroy(&nft_objname_ht);
6001a930 9866err_rht_objname:
d209df3e 9867 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
6001a930 9868err_netdev_notifier:
96518518 9869 nf_tables_core_module_exit();
6001a930 9870err_core_module:
d209df3e 9871 nft_chain_filter_fini();
6001a930 9872err_chain_filter:
d209df3e 9873 unregister_pernet_subsys(&nf_tables_net_ops);
96518518
PM		 9874 return err;
9875}
9876
9877static void __exit nf_tables_module_exit(void)
9878{
9879 nfnetlink_subsys_unregister(&nf_tables_subsys);
6001a930 9880 netlink_unregister_notifier(&nft_nl_notifier);
06d392cb 9881 nft_offload_exit();
3b49e2e9 9882 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
0a2cf5ee 9883 nft_chain_filter_fini();
c1deb065 9884 nft_chain_route_fini();
71ad00c5 9885 unregister_pernet_subsys(&nf_tables_net_ops);
0935d558 9886 cancel_work_sync(&trans_destroy_work);
1b1bc49c 9887 rcu_barrier();
4d44175a 9888 rhltable_destroy(&nft_objname_ht);
96518518 9889 nf_tables_core_module_exit();
96518518
PM		 9890}
9891
9892module_init(nf_tables_module_init);
9893module_exit(nf_tables_module_exit);
9894
9895MODULE_LICENSE("GPL");
9896MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
9897MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
Linux 6.x block layer and io_uring tree(s)