]> git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blame - net/netfilter/nf_tables_api.c
projects / mirror_ubuntu-jammy-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
netfilter: fix memory leaks on netlink_dump_start error
[mirror_ubuntu-jammy-kernel.git] / net / netfilter / nf_tables_api.c
CommitLineData
96518518 1/*
20a69341 2 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
96518518
PM		 3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
9 */
10
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/list.h>
14#include <linux/skbuff.h>
15#include <linux/netlink.h>
1ff75a3e 16#include <linux/vmalloc.h>
0eb71a9d 17#include <linux/rhashtable.h>
96518518
PM		 18#include <linux/netfilter.h>
19#include <linux/netfilter/nfnetlink.h>
20#include <linux/netfilter/nf_tables.h>
3b49e2e9 21#include <net/netfilter/nf_flow_table.h>
96518518
PM		 22#include <net/netfilter/nf_tables_core.h>
23#include <net/netfilter/nf_tables.h>
99633ab2 24#include <net/net_namespace.h>
96518518
PM		 25#include <net/sock.h>
26
96518518 27static LIST_HEAD(nf_tables_expressions);
e5009240 28static LIST_HEAD(nf_tables_objects);
3b49e2e9 29static LIST_HEAD(nf_tables_flowtables);
3ecbfd65 30static u64 table_handle;
96518518 31
a654de8f
PNA		 32enum {
33 NFT_VALIDATE_SKIP = 0,
34 NFT_VALIDATE_NEED,
35 NFT_VALIDATE_DO,
36};
37
1b2470e5
FW		 38static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
39static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
40static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
41
42static const struct rhashtable_params nft_chain_ht_params = {
43 .head_offset = offsetof(struct nft_chain, rhlhead),
44 .key_offset = offsetof(struct nft_chain, name),
45 .hashfn = nft_chain_hash,
46 .obj_hashfn = nft_chain_hash_obj,
47 .obj_cmpfn = nft_chain_hash_cmp,
48 .locks_mul = 1,
49 .automatic_shrinking = true,
50};
51
a654de8f
PNA		 52static void nft_validate_state_update(struct net *net, u8 new_validate_state)
53{
54 switch (net->nft.validate_state) {
55 case NFT_VALIDATE_SKIP:
56 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
57 break;
58 case NFT_VALIDATE_NEED:
59 break;
60 case NFT_VALIDATE_DO:
61 if (new_validate_state == NFT_VALIDATE_NEED)
62 return;
63 }
64
65 net->nft.validate_state = new_validate_state;
66}
67
7c95f6d8 68static void nft_ctx_init(struct nft_ctx *ctx,
633c9a84 69 struct net *net,
7c95f6d8
PNA		 70 const struct sk_buff *skb,
71 const struct nlmsghdr *nlh,
36596dad 72 u8 family,
7c95f6d8
PNA		 73 struct nft_table *table,
74 struct nft_chain *chain,
75 const struct nlattr * const *nla)
76{
633c9a84 77 ctx->net = net;
36596dad 78 ctx->family = family;
26b2f552 79 ctx->level = 0;
128ad332
PNA		 80 ctx->table = table;
81 ctx->chain = chain;
82 ctx->nla = nla;
83 ctx->portid = NETLINK_CB(skb).portid;
84 ctx->report = nlmsg_report(nlh);
85 ctx->seq = nlh->nlmsg_seq;
7c95f6d8
PNA		 86}
87
8411b644
PNA		 88static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
89 int msg_type, u32 size, gfp_t gfp)
1081d11b
PNA		 90{
91 struct nft_trans *trans;
92
8411b644 93 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
1081d11b
PNA		 94 if (trans == NULL)
95 return NULL;
96
b380e5c7 97 trans->msg_type = msg_type;
1081d11b
PNA		 98 trans->ctx = *ctx;
99
100 return trans;
101}
102
8411b644
PNA		 103static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
104 int msg_type, u32 size)
105{
106 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
107}
108
1081d11b
PNA		 109static void nft_trans_destroy(struct nft_trans *trans)
110{
111 list_del(&trans->list);
112 kfree(trans);
113}
114
c974a3a3
PNA		 115static int nf_tables_register_hook(struct net *net,
116 const struct nft_table *table,
117 struct nft_chain *chain)
d8ee8f7c 118{
4e25ceb8 119 const struct nft_base_chain *basechain;
a37061a6 120 const struct nf_hook_ops *ops;
ae6153b5 121
d8ee8f7c 122 if (table->flags & NFT_TABLE_F_DORMANT ||
f323d954 123 !nft_is_base_chain(chain))
d8ee8f7c
PNA		 124 return 0;
125
4e25ceb8
FW		 126 basechain = nft_base_chain(chain);
127 ops = &basechain->ops;
ae6153b5 128
4e25ceb8
FW		 129 if (basechain->type->ops_register)
130 return basechain->type->ops_register(net, ops);
131
a37061a6 132 return nf_register_net_hook(net, ops);
d8ee8f7c
PNA		 133}
134
c974a3a3
PNA		 135static void nf_tables_unregister_hook(struct net *net,
136 const struct nft_table *table,
137 struct nft_chain *chain)
c5598794 138{
4e25ceb8
FW		 139 const struct nft_base_chain *basechain;
140 const struct nf_hook_ops *ops;
141
d8ee8f7c 142 if (table->flags & NFT_TABLE_F_DORMANT ||
f323d954 143 !nft_is_base_chain(chain))
d8ee8f7c 144 return;
4e25ceb8
FW		 145 basechain = nft_base_chain(chain);
146 ops = &basechain->ops;
d8ee8f7c 147
4e25ceb8
FW		 148 if (basechain->type->ops_unregister)
149 return basechain->type->ops_unregister(net, ops);
150
151 nf_unregister_net_hook(net, ops);
c5598794
AB		 152}
153
ee01d542
AB		 154static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
155{
156 struct nft_trans *trans;
157
158 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
159 if (trans == NULL)
160 return -ENOMEM;
161
162 if (msg_type == NFT_MSG_NEWTABLE)
f2a6d766 163 nft_activate_next(ctx->net, ctx->table);
ee01d542
AB		 164
165 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
166 return 0;
167}
168
169static int nft_deltable(struct nft_ctx *ctx)
170{
171 int err;
172
173 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
174 if (err < 0)
175 return err;
176
f2a6d766 177 nft_deactivate_next(ctx->net, ctx->table);
ee01d542
AB		 178 return err;
179}
180
181static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
182{
183 struct nft_trans *trans;
184
185 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
186 if (trans == NULL)
187 return -ENOMEM;
188
189 if (msg_type == NFT_MSG_NEWCHAIN)
664b0f8c 190 nft_activate_next(ctx->net, ctx->chain);
ee01d542
AB		 191
192 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
193 return 0;
194}
195
196static int nft_delchain(struct nft_ctx *ctx)
197{
198 int err;
199
200 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
201 if (err < 0)
202 return err;
203
204 ctx->table->use--;
664b0f8c 205 nft_deactivate_next(ctx->net, ctx->chain);
ee01d542
AB		 206
207 return err;
208}
209
bb7b40ae
PNA		 210static void nft_rule_expr_activate(const struct nft_ctx *ctx,
211 struct nft_rule *rule)
212{
213 struct nft_expr *expr;
214
215 expr = nft_expr_first(rule);
216 while (expr != nft_expr_last(rule) && expr->ops) {
217 if (expr->ops->activate)
218 expr->ops->activate(ctx, expr);
219
220 expr = nft_expr_next(expr);
221 }
222}
223
224static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
225 struct nft_rule *rule)
226{
227 struct nft_expr *expr;
228
229 expr = nft_expr_first(rule);
230 while (expr != nft_expr_last(rule) && expr->ops) {
231 if (expr->ops->deactivate)
232 expr->ops->deactivate(ctx, expr);
233
234 expr = nft_expr_next(expr);
235 }
236}
237
ee01d542
AB		 238static int
239nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
240{
241 /* You cannot delete the same rule twice */
889f7ee7
PNA		 242 if (nft_is_active_next(ctx->net, rule)) {
243 nft_deactivate_next(ctx->net, rule);
ee01d542
AB		 244 ctx->chain->use--;
245 return 0;
246 }
247 return -ENOENT;
248}
249
250static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
251 struct nft_rule *rule)
252{
253 struct nft_trans *trans;
254
255 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
256 if (trans == NULL)
257 return NULL;
258
1a94e38d
PNA		 259 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
260 nft_trans_rule_id(trans) =
261 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
262 }
ee01d542
AB		 263 nft_trans_rule(trans) = rule;
264 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
265
266 return trans;
267}
268
269static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
270{
271 struct nft_trans *trans;
272 int err;
273
274 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
275 if (trans == NULL)
276 return -ENOMEM;
277
278 err = nf_tables_delrule_deactivate(ctx, rule);
279 if (err < 0) {
280 nft_trans_destroy(trans);
281 return err;
282 }
bb7b40ae 283 nft_rule_expr_deactivate(ctx, rule);
ee01d542
AB		 284
285 return 0;
286}
287
288static int nft_delrule_by_chain(struct nft_ctx *ctx)
289{
290 struct nft_rule *rule;
291 int err;
292
293 list_for_each_entry(rule, &ctx->chain->rules, list) {
294 err = nft_delrule(ctx, rule);
295 if (err < 0)
296 return err;
297 }
298 return 0;
299}
300
ee01d542
AB		 301static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
302 struct nft_set *set)
303{
304 struct nft_trans *trans;
305
306 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
307 if (trans == NULL)
308 return -ENOMEM;
309
310 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
311 nft_trans_set_id(trans) =
312 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
37a9cc52 313 nft_activate_next(ctx->net, set);
ee01d542
AB		 314 }
315 nft_trans_set(trans) = set;
316 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
317
318 return 0;
319}
320
321static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
322{
323 int err;
324
325 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
326 if (err < 0)
327 return err;
328
37a9cc52 329 nft_deactivate_next(ctx->net, set);
ee01d542
AB		 330 ctx->table->use--;
331
332 return err;
333}
334
e5009240
PNA		 335static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
336 struct nft_object *obj)
337{
338 struct nft_trans *trans;
339
340 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
341 if (trans == NULL)
342 return -ENOMEM;
343
344 if (msg_type == NFT_MSG_NEWOBJ)
345 nft_activate_next(ctx->net, obj);
346
347 nft_trans_obj(trans) = obj;
348 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
349
350 return 0;
351}
352
353static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
354{
355 int err;
356
357 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
358 if (err < 0)
359 return err;
360
361 nft_deactivate_next(ctx->net, obj);
362 ctx->table->use--;
363
364 return err;
365}
366
3b49e2e9
PNA		 367static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
368 struct nft_flowtable *flowtable)
369{
370 struct nft_trans *trans;
371
372 trans = nft_trans_alloc(ctx, msg_type,
373 sizeof(struct nft_trans_flowtable));
374 if (trans == NULL)
375 return -ENOMEM;
376
377 if (msg_type == NFT_MSG_NEWFLOWTABLE)
378 nft_activate_next(ctx->net, flowtable);
379
380 nft_trans_flowtable(trans) = flowtable;
381 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
382
383 return 0;
384}
385
386static int nft_delflowtable(struct nft_ctx *ctx,
387 struct nft_flowtable *flowtable)
388{
389 int err;
390
391 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
392 if (err < 0)
393 return err;
394
395 nft_deactivate_next(ctx->net, flowtable);
396 ctx->table->use--;
397
398 return err;
399}
400
96518518
PM		 401/*
402 * Tables
403 */
404
36596dad 405static struct nft_table *nft_table_lookup(const struct net *net,
f2a6d766 406 const struct nlattr *nla,
36596dad 407 u8 family, u8 genmask)
96518518
PM		 408{
409 struct nft_table *table;
410
cac20fcd
PNA		 411 if (nla == NULL)
412 return ERR_PTR(-EINVAL);
413
d9adf22a 414 list_for_each_entry_rcu(table, &net->nft.tables, list) {
f2a6d766 415 if (!nla_strcmp(nla, table->name) &&
98319cb9 416 table->family == family &&
f2a6d766 417 nft_active_genmask(table, genmask))
96518518
PM		 418 return table;
419 }
cac20fcd
PNA		 420
421 return ERR_PTR(-ENOENT);
96518518
PM		 422}
423
3ecbfd65
HS		 424static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
425 const struct nlattr *nla,
426 u8 genmask)
427{
428 struct nft_table *table;
429
430 list_for_each_entry(table, &net->nft.tables, list) {
431 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
432 nft_active_genmask(table, genmask))
433 return table;
434 }
3ecbfd65
HS		 435
436 return ERR_PTR(-ENOENT);
437}
438
96518518
PM		 439static inline u64 nf_tables_alloc_handle(struct nft_table *table)
440{
441 return ++table->hgenerator;
442}
443
32537e91 444static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
9370761c 445
32537e91 446static const struct nft_chain_type *
1ea26cca 447__nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
9370761c
PNA		 448{
449 int i;
450
baae3e62 451 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
9370761c
PNA		 452 if (chain_type[family][i] != NULL &&
453 !nla_strcmp(nla, chain_type[family][i]->name))
baae3e62 454 return chain_type[family][i];
9370761c 455 }
baae3e62 456 return NULL;
9370761c
PNA		 457}
458
452238e8
FW		 459/*
460 * Loading a module requires dropping mutex that guards the
461 * transaction.
462 * We first need to abort any pending transactions as once
463 * mutex is unlocked a different client could start a new
464 * transaction. It must not see any 'future generation'
465 * changes * as these changes will never happen.
466 */
467#ifdef CONFIG_MODULES
468static int __nf_tables_abort(struct net *net);
469
470static void nft_request_module(struct net *net, const char *fmt, ...)
471{
472 char module_name[MODULE_NAME_LEN];
473 va_list args;
474 int ret;
475
476 __nf_tables_abort(net);
477
478 va_start(args, fmt);
479 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
480 va_end(args);
481 if (WARN(ret >= MODULE_NAME_LEN, "truncated: '%s' (len %d)", module_name, ret))
482 return;
483
f102d66b 484 mutex_unlock(&net->nft.commit_mutex);
452238e8 485 request_module("%s", module_name);
f102d66b 486 mutex_lock(&net->nft.commit_mutex);
452238e8
FW		 487}
488#endif
489
f102d66b
FW		 490static void lockdep_nfnl_nft_mutex_not_held(void)
491{
492#ifdef CONFIG_PROVE_LOCKING
493 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
494#endif
495}
496
32537e91 497static const struct nft_chain_type *
452238e8
FW		 498nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
499 u8 family, bool autoload)
9370761c 500{
32537e91 501 const struct nft_chain_type *type;
9370761c 502
1ea26cca 503 type = __nf_tables_chain_type_lookup(nla, family);
93b0806f
PM		 504 if (type != NULL)
505 return type;
f102d66b
FW		 506
507 lockdep_nfnl_nft_mutex_not_held();
9370761c 508#ifdef CONFIG_MODULES
93b0806f 509 if (autoload) {
452238e8
FW		 510 nft_request_module(net, "nft-chain-%u-%.*s", family,
511 nla_len(nla), (const char *)nla_data(nla));
1ea26cca 512 type = __nf_tables_chain_type_lookup(nla, family);
93b0806f
PM		 513 if (type != NULL)
514 return ERR_PTR(-EAGAIN);
9370761c
PNA		 515 }
516#endif
93b0806f 517 return ERR_PTR(-ENOENT);
9370761c
PNA		 518}
519
96518518 520static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
1cae565e
PNA		 521 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
522 .len = NFT_TABLE_MAXNAMELEN - 1 },
9ddf6323 523 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
3ecbfd65 524 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
96518518
PM		 525};
526
84d7fce6
PNA		 527static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
528 u32 portid, u32 seq, int event, u32 flags,
529 int family, const struct nft_table *table)
96518518
PM		 530{
531 struct nlmsghdr *nlh;
532 struct nfgenmsg *nfmsg;
533
dedb67c4 534 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518
PM		 535 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
536 if (nlh == NULL)
537 goto nla_put_failure;
538
539 nfmsg = nlmsg_data(nlh);
540 nfmsg->nfgen_family = family;
541 nfmsg->version = NFNETLINK_V0;
84d7fce6 542 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518 543
9ddf6323 544 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
d8bcc768 545 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
3ecbfd65
HS		 546 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
547 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
548 NFTA_TABLE_PAD))
96518518
PM		 549 goto nla_put_failure;
550
053c095a
JB		 551 nlmsg_end(skb, nlh);
552 return 0;
96518518
PM		 553
554nla_put_failure:
555 nlmsg_trim(skb, nlh);
556 return -1;
557}
558
25e94a99 559static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 560{
561 struct sk_buff *skb;
96518518
PM		 562 int err;
563
128ad332
PNA		 564 if (!ctx->report &&
565 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 566 return;
96518518 567
96518518
PM		 568 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
569 if (skb == NULL)
570 goto err;
571
84d7fce6 572 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
36596dad 573 event, 0, ctx->family, ctx->table);
96518518
PM		 574 if (err < 0) {
575 kfree_skb(skb);
576 goto err;
577 }
578
25e94a99
PNA		 579 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
580 ctx->report, GFP_KERNEL);
581 return;
96518518 582err:
25e94a99 583 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 584}
585
586static int nf_tables_dump_tables(struct sk_buff *skb,
587 struct netlink_callback *cb)
588{
589 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
96518518
PM		 590 const struct nft_table *table;
591 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 592 struct net *net = sock_net(skb->sk);
96518518
PM		 593 int family = nfmsg->nfgen_family;
594
e688a7f8 595 rcu_read_lock();
38e029f1
PNA		 596 cb->seq = net->nft.base_seq;
597
36596dad 598 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 599 if (family != NFPROTO_UNSPEC && family != table->family)
96518518
PM		 600 continue;
601
36596dad
PNA		 602 if (idx < s_idx)
603 goto cont;
604 if (idx > s_idx)
605 memset(&cb->args[1], 0,
606 sizeof(cb->args) - sizeof(cb->args[0]));
607 if (!nft_is_active(net, table))
608 continue;
609 if (nf_tables_fill_table_info(skb, net,
610 NETLINK_CB(cb->skb).portid,
611 cb->nlh->nlmsg_seq,
612 NFT_MSG_NEWTABLE, NLM_F_MULTI,
98319cb9 613 table->family, table) < 0)
36596dad
PNA		 614 goto done;
615
616 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518 617cont:
36596dad 618 idx++;
96518518
PM		 619 }
620done:
e688a7f8 621 rcu_read_unlock();
96518518
PM		 622 cb->args[0] = idx;
623 return skb->len;
624}
625
d9adf22a
FW		 626static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
627 const struct nlmsghdr *nlh,
628 struct netlink_dump_control *c)
629{
630 int err;
631
632 if (!try_module_get(THIS_MODULE))
633 return -EINVAL;
634
635 rcu_read_unlock();
636 err = netlink_dump_start(nlsk, skb, nlh, c);
637 rcu_read_lock();
638 module_put(THIS_MODULE);
639
640 return err;
641}
642
643/* called with rcu_read_lock held */
7b8002a1
PNA		 644static int nf_tables_gettable(struct net *net, struct sock *nlsk,
645 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 646 const struct nlattr * const nla[],
647 struct netlink_ext_ack *extack)
96518518
PM		 648{
649 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 650 u8 genmask = nft_genmask_cur(net);
96518518
PM		 651 const struct nft_table *table;
652 struct sk_buff *skb2;
653 int family = nfmsg->nfgen_family;
654 int err;
655
656 if (nlh->nlmsg_flags & NLM_F_DUMP) {
657 struct netlink_dump_control c = {
658 .dump = nf_tables_dump_tables,
d9adf22a 659 .module = THIS_MODULE,
96518518 660 };
d9adf22a
FW		 661
662 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
96518518
PM		 663 }
664
cac20fcd 665 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
36dd1bcc
PNA		 666 if (IS_ERR(table)) {
667 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
96518518 668 return PTR_ERR(table);
36dd1bcc 669 }
96518518 670
d9adf22a 671 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
96518518
PM		 672 if (!skb2)
673 return -ENOMEM;
674
84d7fce6 675 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 676 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
677 family, table);
678 if (err < 0)
679 goto err;
680
681 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
682
683err:
684 kfree_skb(skb2);
685 return err;
686}
687
c9c17211 688static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
10435c11
F		 689{
690 struct nft_chain *chain;
691 u32 i = 0;
692
693 list_for_each_entry(chain, &table->chains, list) {
694 if (!nft_is_active_next(net, chain))
695 continue;
f323d954 696 if (!nft_is_base_chain(chain))
10435c11
F		 697 continue;
698
699 if (cnt && i++ == cnt)
700 break;
701
c974a3a3 702 nf_unregister_net_hook(net, &nft_base_chain(chain)->ops);
10435c11
F		 703 }
704}
705
c9c17211 706static int nf_tables_table_enable(struct net *net, struct nft_table *table)
9ddf6323
PNA		 707{
708 struct nft_chain *chain;
709 int err, i = 0;
710
711 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 712 if (!nft_is_active_next(net, chain))
713 continue;
f323d954 714 if (!nft_is_base_chain(chain))
d2012975
PNA		 715 continue;
716
c974a3a3 717 err = nf_register_net_hook(net, &nft_base_chain(chain)->ops);
9ddf6323
PNA		 718 if (err < 0)
719 goto err;
720
721 i++;
722 }
723 return 0;
724err:
10435c11 725 if (i)
c9c17211 726 nft_table_disable(net, table, i);
9ddf6323
PNA		 727 return err;
728}
729
c9c17211 730static void nf_tables_table_disable(struct net *net, struct nft_table *table)
9ddf6323 731{
c9c17211 732 nft_table_disable(net, table, 0);
9ddf6323
PNA		 733}
734
e1aaca93 735static int nf_tables_updtable(struct nft_ctx *ctx)
9ddf6323 736{
55dd6f93 737 struct nft_trans *trans;
e1aaca93 738 u32 flags;
55dd6f93 739 int ret = 0;
9ddf6323 740
e1aaca93
PNA		 741 if (!ctx->nla[NFTA_TABLE_FLAGS])
742 return 0;
9ddf6323 743
e1aaca93
PNA		 744 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
745 if (flags & ~NFT_TABLE_F_DORMANT)
746 return -EINVAL;
747
63283dd2
PNA		 748 if (flags == ctx->table->flags)
749 return 0;
750
55dd6f93
PNA		 751 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
752 sizeof(struct nft_trans_table));
753 if (trans == NULL)
754 return -ENOMEM;
9ddf6323 755
e1aaca93
PNA		 756 if ((flags & NFT_TABLE_F_DORMANT) &&
757 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
55dd6f93 758 nft_trans_table_enable(trans) = false;
e1aaca93
PNA		 759 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
760 ctx->table->flags & NFT_TABLE_F_DORMANT) {
c9c17211 761 ret = nf_tables_table_enable(ctx->net, ctx->table);
55dd6f93 762 if (ret >= 0) {
e1aaca93 763 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
55dd6f93 764 nft_trans_table_enable(trans) = true;
9ddf6323 765 }
9ddf6323 766 }
e1aaca93
PNA		 767 if (ret < 0)
768 goto err;
9ddf6323 769
55dd6f93
PNA		 770 nft_trans_table_update(trans) = true;
771 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
772 return 0;
9ddf6323 773err:
55dd6f93 774 nft_trans_destroy(trans);
9ddf6323
PNA		 775 return ret;
776}
777
1b2470e5
FW		 778static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
779{
780 const char *name = data;
781
782 return jhash(name, strlen(name), seed);
783}
784
785static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
786{
787 const struct nft_chain *chain = data;
788
789 return nft_chain_hash(chain->name, 0, seed);
790}
791
792static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
793 const void *ptr)
794{
795 const struct nft_chain *chain = ptr;
796 const char *name = arg->key;
797
798 return strcmp(chain->name, name);
799}
800
633c9a84
PNA		 801static int nf_tables_newtable(struct net *net, struct sock *nlsk,
802 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 803 const struct nlattr * const nla[],
804 struct netlink_ext_ack *extack)
96518518
PM		 805{
806 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 807 u8 genmask = nft_genmask_next(net);
96518518 808 int family = nfmsg->nfgen_family;
36dd1bcc
PNA		 809 const struct nlattr *attr;
810 struct nft_table *table;
c5c1f975 811 u32 flags = 0;
e1aaca93 812 struct nft_ctx ctx;
55dd6f93 813 int err;
96518518 814
f102d66b 815 lockdep_assert_held(&net->nft.commit_mutex);
36dd1bcc
PNA		 816 attr = nla[NFTA_TABLE_NAME];
817 table = nft_table_lookup(net, attr, family, genmask);
96518518
PM		 818 if (IS_ERR(table)) {
819 if (PTR_ERR(table) != -ENOENT)
820 return PTR_ERR(table);
1a28ad74 821 } else {
36dd1bcc
PNA		 822 if (nlh->nlmsg_flags & NLM_F_EXCL) {
823 NL_SET_BAD_ATTR(extack, attr);
96518518 824 return -EEXIST;
36dd1bcc 825 }
96518518
PM		 826 if (nlh->nlmsg_flags & NLM_F_REPLACE)
827 return -EOPNOTSUPP;
e1aaca93 828
98319cb9 829 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
e1aaca93 830 return nf_tables_updtable(&ctx);
96518518
PM		 831 }
832
c5c1f975
PM		 833 if (nla[NFTA_TABLE_FLAGS]) {
834 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
835 if (flags & ~NFT_TABLE_F_DORMANT)
836 return -EINVAL;
837 }
838
ffdb210e 839 err = -ENOMEM;
1cae565e 840 table = kzalloc(sizeof(*table), GFP_KERNEL);
ffdb210e 841 if (table == NULL)
98319cb9 842 goto err_kzalloc;
96518518 843
36dd1bcc 844 table->name = nla_strdup(attr, GFP_KERNEL);
e46abbcc 845 if (table->name == NULL)
98319cb9 846 goto err_strdup;
e46abbcc 847
1b2470e5
FW		 848 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
849 if (err)
850 goto err_chain_ht;
851
96518518 852 INIT_LIST_HEAD(&table->chains);
20a69341 853 INIT_LIST_HEAD(&table->sets);
e5009240 854 INIT_LIST_HEAD(&table->objects);
3b49e2e9 855 INIT_LIST_HEAD(&table->flowtables);
98319cb9 856 table->family = family;
c5c1f975 857 table->flags = flags;
3ecbfd65 858 table->handle = ++table_handle;
9ddf6323 859
98319cb9 860 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
55dd6f93 861 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
ffdb210e 862 if (err < 0)
98319cb9 863 goto err_trans;
ffdb210e 864
36596dad 865 list_add_tail_rcu(&table->list, &net->nft.tables);
96518518 866 return 0;
98319cb9 867err_trans:
1b2470e5
FW		 868 rhltable_destroy(&table->chains_ht);
869err_chain_ht:
e46abbcc 870 kfree(table->name);
98319cb9 871err_strdup:
ffdb210e 872 kfree(table);
98319cb9 873err_kzalloc:
ffdb210e 874 return err;
96518518
PM		 875}
876
b9ac12ef
AB		 877static int nft_flush_table(struct nft_ctx *ctx)
878{
3b49e2e9 879 struct nft_flowtable *flowtable, *nft;
b9ac12ef 880 struct nft_chain *chain, *nc;
e5009240 881 struct nft_object *obj, *ne;
b9ac12ef 882 struct nft_set *set, *ns;
3b49e2e9 883 int err;
b9ac12ef 884
a2f18db0 885 list_for_each_entry(chain, &ctx->table->chains, list) {
664b0f8c
PNA		 886 if (!nft_is_active_next(ctx->net, chain))
887 continue;
888
b9ac12ef
AB		 889 ctx->chain = chain;
890
891 err = nft_delrule_by_chain(ctx);
892 if (err < 0)
893 goto out;
b9ac12ef
AB		 894 }
895
896 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
37a9cc52
PNA		 897 if (!nft_is_active_next(ctx->net, set))
898 continue;
899
408070d6 900 if (nft_set_is_anonymous(set) &&
b9ac12ef
AB		 901 !list_empty(&set->bindings))
902 continue;
903
904 err = nft_delset(ctx, set);
905 if (err < 0)
906 goto out;
907 }
908
3b49e2e9
PNA		 909 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
910 err = nft_delflowtable(ctx, flowtable);
911 if (err < 0)
912 goto out;
913 }
914
e5009240
PNA		 915 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
916 err = nft_delobj(ctx, obj);
917 if (err < 0)
918 goto out;
919 }
920
a2f18db0 921 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
664b0f8c
PNA		 922 if (!nft_is_active_next(ctx->net, chain))
923 continue;
924
a2f18db0
PNA		 925 ctx->chain = chain;
926
927 err = nft_delchain(ctx);
928 if (err < 0)
929 goto out;
930 }
931
b9ac12ef
AB		 932 err = nft_deltable(ctx);
933out:
934 return err;
935}
936
937static int nft_flush(struct nft_ctx *ctx, int family)
938{
b9ac12ef
AB		 939 struct nft_table *table, *nt;
940 const struct nlattr * const *nla = ctx->nla;
941 int err = 0;
942
36596dad 943 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
98319cb9 944 if (family != AF_UNSPEC && table->family != family)
b9ac12ef
AB		 945 continue;
946
98319cb9 947 ctx->family = table->family;
f2a6d766 948
36596dad
PNA		 949 if (!nft_is_active_next(ctx->net, table))
950 continue;
b9ac12ef 951
36596dad
PNA		 952 if (nla[NFTA_TABLE_NAME] &&
953 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
954 continue;
b9ac12ef 955
36596dad
PNA		 956 ctx->table = table;
957
958 err = nft_flush_table(ctx);
959 if (err < 0)
960 goto out;
b9ac12ef
AB		 961 }
962out:
963 return err;
964}
965
633c9a84
PNA		 966static int nf_tables_deltable(struct net *net, struct sock *nlsk,
967 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 968 const struct nlattr * const nla[],
969 struct netlink_ext_ack *extack)
96518518
PM		 970{
971 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 972 u8 genmask = nft_genmask_next(net);
ee01d542 973 int family = nfmsg->nfgen_family;
36dd1bcc
PNA		 974 const struct nlattr *attr;
975 struct nft_table *table;
55dd6f93 976 struct nft_ctx ctx;
96518518 977
36596dad 978 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
3ecbfd65
HS		 979 if (family == AF_UNSPEC ||
980 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
b9ac12ef
AB		 981 return nft_flush(&ctx, family);
982
36dd1bcc
PNA		 983 if (nla[NFTA_TABLE_HANDLE]) {
984 attr = nla[NFTA_TABLE_HANDLE];
985 table = nft_table_lookup_byhandle(net, attr, genmask);
986 } else {
987 attr = nla[NFTA_TABLE_NAME];
988 table = nft_table_lookup(net, attr, family, genmask);
989 }
3ecbfd65 990
36dd1bcc
PNA		 991 if (IS_ERR(table)) {
992 NL_SET_BAD_ATTR(extack, attr);
96518518 993 return PTR_ERR(table);
36dd1bcc 994 }
96518518 995
a8278400
PNA		 996 if (nlh->nlmsg_flags & NLM_F_NONREC &&
997 table->use > 0)
998 return -EBUSY;
999
98319cb9 1000 ctx.family = family;
b9ac12ef 1001 ctx.table = table;
55dd6f93 1002
b9ac12ef 1003 return nft_flush_table(&ctx);
96518518
PM		 1004}
1005
55dd6f93
PNA		 1006static void nf_tables_table_destroy(struct nft_ctx *ctx)
1007{
4fefee57
PNA		 1008 BUG_ON(ctx->table->use > 0);
1009
1b2470e5 1010 rhltable_destroy(&ctx->table->chains_ht);
e46abbcc 1011 kfree(ctx->table->name);
55dd6f93 1012 kfree(ctx->table);
55dd6f93
PNA		 1013}
1014
cc07eeb0 1015void nft_register_chain_type(const struct nft_chain_type *ctype)
96518518 1016{
d8297d4f 1017 if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO))
cc07eeb0 1018 return;
d8297d4f 1019
96518518 1020 nfnl_lock(NFNL_SUBSYS_NFTABLES);
cc07eeb0
PNA		 1021 if (WARN_ON(chain_type[ctype->family][ctype->type] != NULL)) {
1022 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1023 return;
96518518 1024 }
9370761c 1025 chain_type[ctype->family][ctype->type] = ctype;
96518518 1026 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
96518518 1027}
9370761c 1028EXPORT_SYMBOL_GPL(nft_register_chain_type);
96518518 1029
32537e91 1030void nft_unregister_chain_type(const struct nft_chain_type *ctype)
96518518 1031{
96518518 1032 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c 1033 chain_type[ctype->family][ctype->type] = NULL;
96518518
PM		 1034 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1035}
9370761c 1036EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
96518518
PM		 1037
1038/*
1039 * Chains
1040 */
1041
1042static struct nft_chain *
cac20fcd 1043nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
96518518
PM		 1044{
1045 struct nft_chain *chain;
1046
1047 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 1048 if (chain->handle == handle &&
1049 nft_active_genmask(chain, genmask))
96518518
PM		 1050 return chain;
1051 }
1052
1053 return ERR_PTR(-ENOENT);
1054}
1055
f102d66b
FW		 1056static bool lockdep_commit_lock_is_held(struct net *net)
1057{
1058#ifdef CONFIG_PROVE_LOCKING
1059 return lockdep_is_held(&net->nft.commit_mutex);
1060#else
1061 return true;
1062#endif
1063}
1064
1065static struct nft_chain *nft_chain_lookup(struct net *net,
1066 struct nft_table *table,
cac20fcd 1067 const struct nlattr *nla, u8 genmask)
96518518 1068{
1b2470e5
FW		 1069 char search[NFT_CHAIN_MAXNAMELEN + 1];
1070 struct rhlist_head *tmp, *list;
96518518
PM		 1071 struct nft_chain *chain;
1072
1073 if (nla == NULL)
1074 return ERR_PTR(-EINVAL);
1075
1b2470e5 1076 nla_strlcpy(search, nla, sizeof(search));
96518518 1077
1b2470e5 1078 WARN_ON(!rcu_read_lock_held() &&
f102d66b 1079 !lockdep_commit_lock_is_held(net));
1b2470e5
FW		 1080
1081 chain = ERR_PTR(-ENOENT);
1082 rcu_read_lock();
1083 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1084 if (!list)
1085 goto out_unlock;
1086
1087 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1088 if (nft_active_genmask(chain, genmask))
1089 goto out_unlock;
1090 }
1091 chain = ERR_PTR(-ENOENT);
1092out_unlock:
1093 rcu_read_unlock();
1094 return chain;
96518518
PM		 1095}
1096
1097static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
b2fbd044
LZ		 1098 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1099 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 1100 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1101 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1102 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1103 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
0ca743a5 1104 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
4c1f7818 1105 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
0ca743a5 1106 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
96518518
PM		 1107};
1108
1109static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1110 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1111 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
2cbce139
PNA		 1112 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1113 .len = IFNAMSIZ - 1 },
96518518
PM		 1114};
1115
0ca743a5
PNA		 1116static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1117{
1118 struct nft_stats *cpu_stats, total;
1119 struct nlattr *nest;
ce355e20
ED		 1120 unsigned int seq;
1121 u64 pkts, bytes;
0ca743a5
PNA		 1122 int cpu;
1123
1124 memset(&total, 0, sizeof(total));
1125 for_each_possible_cpu(cpu) {
1126 cpu_stats = per_cpu_ptr(stats, cpu);
ce355e20
ED		 1127 do {
1128 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1129 pkts = cpu_stats->pkts;
1130 bytes = cpu_stats->bytes;
1131 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1132 total.pkts += pkts;
1133 total.bytes += bytes;
0ca743a5
PNA		 1134 }
1135 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
1136 if (nest == NULL)
1137 goto nla_put_failure;
1138
b46f6ded
ND		 1139 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1140 NFTA_COUNTER_PAD) ||
1141 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1142 NFTA_COUNTER_PAD))
0ca743a5
PNA		 1143 goto nla_put_failure;
1144
1145 nla_nest_end(skb, nest);
1146 return 0;
1147
1148nla_put_failure:
1149 return -ENOSPC;
1150}
1151
84d7fce6
PNA		 1152static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1153 u32 portid, u32 seq, int event, u32 flags,
1154 int family, const struct nft_table *table,
96518518
PM		 1155 const struct nft_chain *chain)
1156{
1157 struct nlmsghdr *nlh;
1158 struct nfgenmsg *nfmsg;
1159
dedb67c4 1160 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518
PM		 1161 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1162 if (nlh == NULL)
1163 goto nla_put_failure;
1164
1165 nfmsg = nlmsg_data(nlh);
1166 nfmsg->nfgen_family = family;
1167 nfmsg->version = NFNETLINK_V0;
84d7fce6 1168 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 1169
1170 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1171 goto nla_put_failure;
b46f6ded
ND		 1172 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1173 NFTA_CHAIN_PAD))
96518518
PM		 1174 goto nla_put_failure;
1175 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1176 goto nla_put_failure;
1177
f323d954 1178 if (nft_is_base_chain(chain)) {
0ca743a5 1179 const struct nft_base_chain *basechain = nft_base_chain(chain);
c974a3a3 1180 const struct nf_hook_ops *ops = &basechain->ops;
0ca743a5
PNA		 1181 struct nlattr *nest;
1182
1183 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
96518518
PM		 1184 if (nest == NULL)
1185 goto nla_put_failure;
1186 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1187 goto nla_put_failure;
1188 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1189 goto nla_put_failure;
2cbce139
PNA		 1190 if (basechain->dev_name[0] &&
1191 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1192 goto nla_put_failure;
96518518 1193 nla_nest_end(skb, nest);
9370761c 1194
0ca743a5
PNA		 1195 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1196 htonl(basechain->policy)))
1197 goto nla_put_failure;
1198
baae3e62
PM		 1199 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1200 goto nla_put_failure;
0ca743a5 1201
5f9bfe0e 1202 if (basechain->stats && nft_dump_stats(skb, basechain->stats))
0ca743a5 1203 goto nla_put_failure;
96518518
PM		 1204 }
1205
0ca743a5
PNA		 1206 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1207 goto nla_put_failure;
1208
053c095a
JB		 1209 nlmsg_end(skb, nlh);
1210 return 0;
96518518
PM		 1211
1212nla_put_failure:
1213 nlmsg_trim(skb, nlh);
1214 return -1;
1215}
1216
25e94a99 1217static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 1218{
1219 struct sk_buff *skb;
96518518
PM		 1220 int err;
1221
128ad332
PNA		 1222 if (!ctx->report &&
1223 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 1224 return;
96518518 1225
96518518
PM		 1226 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1227 if (skb == NULL)
1228 goto err;
1229
84d7fce6 1230 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
36596dad 1231 event, 0, ctx->family, ctx->table,
35151d84 1232 ctx->chain);
96518518
PM		 1233 if (err < 0) {
1234 kfree_skb(skb);
1235 goto err;
1236 }
1237
25e94a99
PNA		 1238 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1239 ctx->report, GFP_KERNEL);
1240 return;
96518518 1241err:
25e94a99 1242 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 1243}
1244
1245static int nf_tables_dump_chains(struct sk_buff *skb,
1246 struct netlink_callback *cb)
1247{
1248 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
96518518
PM		 1249 const struct nft_table *table;
1250 const struct nft_chain *chain;
1251 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1252 struct net *net = sock_net(skb->sk);
96518518
PM		 1253 int family = nfmsg->nfgen_family;
1254
e688a7f8 1255 rcu_read_lock();
38e029f1
PNA		 1256 cb->seq = net->nft.base_seq;
1257
36596dad 1258 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 1259 if (family != NFPROTO_UNSPEC && family != table->family)
96518518
PM		 1260 continue;
1261
36596dad
PNA		 1262 list_for_each_entry_rcu(chain, &table->chains, list) {
1263 if (idx < s_idx)
1264 goto cont;
1265 if (idx > s_idx)
1266 memset(&cb->args[1], 0,
1267 sizeof(cb->args) - sizeof(cb->args[0]));
1268 if (!nft_is_active(net, chain))
1269 continue;
1270 if (nf_tables_fill_chain_info(skb, net,
1271 NETLINK_CB(cb->skb).portid,
1272 cb->nlh->nlmsg_seq,
1273 NFT_MSG_NEWCHAIN,
1274 NLM_F_MULTI,
98319cb9 1275 table->family, table,
36596dad
PNA		 1276 chain) < 0)
1277 goto done;
38e029f1 1278
36596dad 1279 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518 1280cont:
36596dad 1281 idx++;
96518518
PM		 1282 }
1283 }
1284done:
e688a7f8 1285 rcu_read_unlock();
96518518
PM		 1286 cb->args[0] = idx;
1287 return skb->len;
1288}
1289
d9adf22a 1290/* called with rcu_read_lock held */
7b8002a1
PNA		 1291static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1292 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 1293 const struct nlattr * const nla[],
1294 struct netlink_ext_ack *extack)
96518518
PM		 1295{
1296 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1297 u8 genmask = nft_genmask_cur(net);
96518518 1298 const struct nft_chain *chain;
1b2470e5 1299 struct nft_table *table;
96518518
PM		 1300 struct sk_buff *skb2;
1301 int family = nfmsg->nfgen_family;
1302 int err;
1303
1304 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1305 struct netlink_dump_control c = {
1306 .dump = nf_tables_dump_chains,
d9adf22a 1307 .module = THIS_MODULE,
96518518 1308 };
d9adf22a
FW		 1309
1310 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
96518518
PM		 1311 }
1312
cac20fcd 1313 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
36dd1bcc
PNA		 1314 if (IS_ERR(table)) {
1315 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
96518518 1316 return PTR_ERR(table);
36dd1bcc 1317 }
96518518 1318
f102d66b 1319 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
36dd1bcc
PNA		 1320 if (IS_ERR(chain)) {
1321 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
96518518 1322 return PTR_ERR(chain);
36dd1bcc 1323 }
96518518 1324
d9adf22a 1325 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
96518518
PM		 1326 if (!skb2)
1327 return -ENOMEM;
1328
84d7fce6 1329 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 1330 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1331 family, table, chain);
1332 if (err < 0)
1333 goto err;
1334
1335 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1336
1337err:
1338 kfree_skb(skb2);
1339 return err;
1340}
1341
0ca743a5
PNA		 1342static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1343 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1344 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1345};
1346
ff3cd7b3 1347static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
0ca743a5
PNA		 1348{
1349 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1350 struct nft_stats __percpu *newstats;
1351 struct nft_stats *stats;
1352 int err;
1353
fceb6435
JB		 1354 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy,
1355 NULL);
0ca743a5 1356 if (err < 0)
ff3cd7b3 1357 return ERR_PTR(err);
0ca743a5
PNA		 1358
1359 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
ff3cd7b3 1360 return ERR_PTR(-EINVAL);
0ca743a5 1361
ce355e20 1362 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
0ca743a5 1363 if (newstats == NULL)
ff3cd7b3 1364 return ERR_PTR(-ENOMEM);
0ca743a5
PNA		 1365
1366 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1367 * are not exposed to userspace.
1368 */
e8781f70 1369 preempt_disable();
0ca743a5
PNA		 1370 stats = this_cpu_ptr(newstats);
1371 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1372 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
e8781f70 1373 preempt_enable();
0ca743a5 1374
ff3cd7b3
PNA		 1375 return newstats;
1376}
1377
1378static void nft_chain_stats_replace(struct nft_base_chain *chain,
1379 struct nft_stats __percpu *newstats)
1380{
0befd061
PNA		 1381 struct nft_stats __percpu *oldstats;
1382
b88825de
PNA		 1383 if (newstats == NULL)
1384 return;
1385
0ca743a5 1386 if (chain->stats) {
0befd061 1387 oldstats = nfnl_dereference(chain->stats, NFNL_SUBSYS_NFTABLES);
0ca743a5
PNA		 1388 rcu_assign_pointer(chain->stats, newstats);
1389 synchronize_rcu();
1390 free_percpu(oldstats);
bbb8c61f 1391 } else {
0ca743a5 1392 rcu_assign_pointer(chain->stats, newstats);
bbb8c61f
TY		 1393 static_branch_inc(&nft_counters_enabled);
1394 }
0ca743a5
PNA		 1395}
1396
0cbc06b3
FW		 1397static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1398{
1399 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1400 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1401
1402 if (g0 != g1)
1403 kvfree(g1);
1404 kvfree(g0);
1405
1406 /* should be NULL either via abort or via successful commit */
1407 WARN_ON_ONCE(chain->rules_next);
1408 kvfree(chain->rules_next);
1409}
1410
43a605f2 1411static void nf_tables_chain_destroy(struct nft_ctx *ctx)
91c7b38d 1412{
43a605f2
PNA		 1413 struct nft_chain *chain = ctx->chain;
1414
91c7b38d
PNA		 1415 BUG_ON(chain->use > 0);
1416
0cbc06b3
FW		 1417 /* no concurrent access possible anymore */
1418 nf_tables_chain_free_chain_rules(chain);
1419
f323d954 1420 if (nft_is_base_chain(chain)) {
2cbce139
PNA		 1421 struct nft_base_chain *basechain = nft_base_chain(chain);
1422
1423 module_put(basechain->type->owner);
1424 free_percpu(basechain->stats);
9f08ea84
PNA		 1425 if (basechain->stats)
1426 static_branch_dec(&nft_counters_enabled);
b7263e07 1427 kfree(chain->name);
2cbce139 1428 kfree(basechain);
91c7b38d 1429 } else {
b7263e07 1430 kfree(chain->name);
91c7b38d
PNA		 1431 kfree(chain);
1432 }
1433}
1434
508f8ccd
PNA		 1435struct nft_chain_hook {
1436 u32 num;
84ba7dd7 1437 s32 priority;
32537e91 1438 const struct nft_chain_type *type;
508f8ccd
PNA		 1439 struct net_device *dev;
1440};
1441
1442static int nft_chain_parse_hook(struct net *net,
1443 const struct nlattr * const nla[],
36596dad 1444 struct nft_chain_hook *hook, u8 family,
445509eb 1445 bool autoload)
508f8ccd
PNA		 1446{
1447 struct nlattr *ha[NFTA_HOOK_MAX + 1];
32537e91 1448 const struct nft_chain_type *type;
508f8ccd
PNA		 1449 struct net_device *dev;
1450 int err;
1451
f102d66b
FW		 1452 lockdep_assert_held(&net->nft.commit_mutex);
1453 lockdep_nfnl_nft_mutex_not_held();
1454
508f8ccd 1455 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
fceb6435 1456 nft_hook_policy, NULL);
508f8ccd
PNA		 1457 if (err < 0)
1458 return err;
1459
1460 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1461 ha[NFTA_HOOK_PRIORITY] == NULL)
1462 return -EINVAL;
1463
1464 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
508f8ccd
PNA		 1465 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1466
36596dad 1467 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
508f8ccd 1468 if (nla[NFTA_CHAIN_TYPE]) {
452238e8 1469 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
445509eb 1470 family, autoload);
508f8ccd
PNA		 1471 if (IS_ERR(type))
1472 return PTR_ERR(type);
1473 }
1474 if (!(type->hook_mask & (1 << hook->num)))
1475 return -EOPNOTSUPP;
84ba7dd7
FW		 1476
1477 if (type->type == NFT_CHAIN_T_NAT &&
1478 hook->priority <= NF_IP_PRI_CONNTRACK)
1479 return -EOPNOTSUPP;
1480
508f8ccd
PNA		 1481 if (!try_module_get(type->owner))
1482 return -ENOENT;
1483
1484 hook->type = type;
1485
1486 hook->dev = NULL;
36596dad 1487 if (family == NFPROTO_NETDEV) {
508f8ccd
PNA		 1488 char ifname[IFNAMSIZ];
1489
1490 if (!ha[NFTA_HOOK_DEV]) {
1491 module_put(type->owner);
1492 return -EOPNOTSUPP;
1493 }
1494
1495 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
90d2723c 1496 dev = __dev_get_by_name(net, ifname);
508f8ccd
PNA		 1497 if (!dev) {
1498 module_put(type->owner);
1499 return -ENOENT;
1500 }
1501 hook->dev = dev;
1502 } else if (ha[NFTA_HOOK_DEV]) {
1503 module_put(type->owner);
1504 return -EOPNOTSUPP;
1505 }
1506
1507 return 0;
1508}
1509
1510static void nft_chain_release_hook(struct nft_chain_hook *hook)
1511{
1512 module_put(hook->type->owner);
508f8ccd
PNA		 1513}
1514
0cbc06b3
FW		 1515struct nft_rules_old {
1516 struct rcu_head h;
1517 struct nft_rule **start;
1518};
1519
1520static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1521 unsigned int alloc)
1522{
1523 if (alloc > INT_MAX)
1524 return NULL;
1525
1526 alloc += 1; /* NULL, ends rules */
1527 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1528 return NULL;
1529
1530 alloc *= sizeof(struct nft_rule *);
1531 alloc += sizeof(struct nft_rules_old);
1532
1533 return kvmalloc(alloc, GFP_KERNEL);
1534}
1535
4035285f 1536static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
445509eb 1537 u8 policy)
4035285f
PNA		 1538{
1539 const struct nlattr * const *nla = ctx->nla;
1540 struct nft_table *table = ctx->table;
4035285f
PNA		 1541 struct nft_base_chain *basechain;
1542 struct nft_stats __percpu *stats;
1543 struct net *net = ctx->net;
1544 struct nft_chain *chain;
0cbc06b3 1545 struct nft_rule **rules;
4035285f
PNA		 1546 int err;
1547
1548 if (table->use == UINT_MAX)
1549 return -EOVERFLOW;
1550
1551 if (nla[NFTA_CHAIN_HOOK]) {
1552 struct nft_chain_hook hook;
1553 struct nf_hook_ops *ops;
4035285f 1554
445509eb 1555 err = nft_chain_parse_hook(net, nla, &hook, family, true);
4035285f
PNA		 1556 if (err < 0)
1557 return err;
1558
1559 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1560 if (basechain == NULL) {
1561 nft_chain_release_hook(&hook);
1562 return -ENOMEM;
1563 }
1564
1565 if (hook.dev != NULL)
1566 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1567
1568 if (nla[NFTA_CHAIN_COUNTERS]) {
1569 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1570 if (IS_ERR(stats)) {
1571 nft_chain_release_hook(&hook);
1572 kfree(basechain);
1573 return PTR_ERR(stats);
1574 }
1575 basechain->stats = stats;
1576 static_branch_inc(&nft_counters_enabled);
1577 }
1578
4035285f
PNA		 1579 basechain->type = hook.type;
1580 chain = &basechain->chain;
1581
c974a3a3
PNA		 1582 ops = &basechain->ops;
1583 ops->pf = family;
1584 ops->hooknum = hook.num;
1585 ops->priority = hook.priority;
1586 ops->priv = chain;
c2f9eafe 1587 ops->hook = hook.type->hooks[ops->hooknum];
c974a3a3 1588 ops->dev = hook.dev;
c974a3a3 1589
4035285f
PNA		 1590 chain->flags |= NFT_BASE_CHAIN;
1591 basechain->policy = policy;
1592 } else {
1593 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1594 if (chain == NULL)
1595 return -ENOMEM;
1596 }
43a605f2
PNA		 1597 ctx->chain = chain;
1598
4035285f
PNA		 1599 INIT_LIST_HEAD(&chain->rules);
1600 chain->handle = nf_tables_alloc_handle(table);
1601 chain->table = table;
1602 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1603 if (!chain->name) {
1604 err = -ENOMEM;
1605 goto err1;
1606 }
1607
0cbc06b3
FW		 1608 rules = nf_tables_chain_alloc_rules(chain, 0);
1609 if (!rules) {
1610 err = -ENOMEM;
1611 goto err1;
1612 }
1613
1614 *rules = NULL;
1615 rcu_assign_pointer(chain->rules_gen_0, rules);
1616 rcu_assign_pointer(chain->rules_gen_1, rules);
1617
c974a3a3 1618 err = nf_tables_register_hook(net, table, chain);
4035285f
PNA		 1619 if (err < 0)
1620 goto err1;
1621
1b2470e5
FW		 1622 err = rhltable_insert_key(&table->chains_ht, chain->name,
1623 &chain->rhlhead, nft_chain_ht_params);
1624 if (err)
1625 goto err2;
1626
4035285f 1627 err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1b2470e5
FW		 1628 if (err < 0) {
1629 rhltable_remove(&table->chains_ht, &chain->rhlhead,
1630 nft_chain_ht_params);
4035285f 1631 goto err2;
1b2470e5 1632 }
4035285f
PNA		 1633
1634 table->use++;
1635 list_add_tail_rcu(&chain->list, &table->chains);
1636
1637 return 0;
1638err2:
c974a3a3 1639 nf_tables_unregister_hook(net, table, chain);
4035285f 1640err1:
43a605f2 1641 nf_tables_chain_destroy(ctx);
4035285f
PNA		 1642
1643 return err;
1644}
1645
445509eb 1646static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy)
2c4a488a
PNA		 1647{
1648 const struct nlattr * const *nla = ctx->nla;
1649 struct nft_table *table = ctx->table;
1650 struct nft_chain *chain = ctx->chain;
2c4a488a
PNA		 1651 struct nft_base_chain *basechain;
1652 struct nft_stats *stats = NULL;
1653 struct nft_chain_hook hook;
2c4a488a
PNA		 1654 struct nf_hook_ops *ops;
1655 struct nft_trans *trans;
c974a3a3 1656 int err;
2c4a488a
PNA		 1657
1658 if (nla[NFTA_CHAIN_HOOK]) {
1659 if (!nft_is_base_chain(chain))
1660 return -EBUSY;
1661
36596dad 1662 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
445509eb 1663 false);
2c4a488a
PNA		 1664 if (err < 0)
1665 return err;
1666
1667 basechain = nft_base_chain(chain);
1668 if (basechain->type != hook.type) {
1669 nft_chain_release_hook(&hook);
1670 return -EBUSY;
1671 }
1672
c974a3a3
PNA		 1673 ops = &basechain->ops;
1674 if (ops->hooknum != hook.num ||
1675 ops->priority != hook.priority ||
1676 ops->dev != hook.dev) {
1677 nft_chain_release_hook(&hook);
1678 return -EBUSY;
2c4a488a
PNA		 1679 }
1680 nft_chain_release_hook(&hook);
1681 }
1682
1683 if (nla[NFTA_CHAIN_HANDLE] &&
1684 nla[NFTA_CHAIN_NAME]) {
1685 struct nft_chain *chain2;
1686
f102d66b
FW		 1687 chain2 = nft_chain_lookup(ctx->net, table,
1688 nla[NFTA_CHAIN_NAME], genmask);
0d18779b
JC		 1689 if (!IS_ERR(chain2))
1690 return -EEXIST;
2c4a488a
PNA		 1691 }
1692
1693 if (nla[NFTA_CHAIN_COUNTERS]) {
1694 if (!nft_is_base_chain(chain))
1695 return -EOPNOTSUPP;
1696
1697 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1698 if (IS_ERR(stats))
1699 return PTR_ERR(stats);
1700 }
1701
c6cc94df 1702 err = -ENOMEM;
2c4a488a
PNA		 1703 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
1704 sizeof(struct nft_trans_chain));
c6cc94df
FW		 1705 if (trans == NULL)
1706 goto err;
2c4a488a
PNA		 1707
1708 nft_trans_chain_stats(trans) = stats;
1709 nft_trans_chain_update(trans) = true;
1710
1711 if (nla[NFTA_CHAIN_POLICY])
1712 nft_trans_chain_policy(trans) = policy;
1713 else
1714 nft_trans_chain_policy(trans) = -1;
1715
c6cc94df
FW		 1716 if (nla[NFTA_CHAIN_HANDLE] &&
1717 nla[NFTA_CHAIN_NAME]) {
1718 struct nft_trans *tmp;
1719 char *name;
1720
1721 err = -ENOMEM;
1722 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1723 if (!name)
1724 goto err;
1725
1726 err = -EEXIST;
1727 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
1728 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
1729 tmp->ctx.table == table &&
1730 nft_trans_chain_update(tmp) &&
1731 nft_trans_chain_name(tmp) &&
1732 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
1733 kfree(name);
1734 goto err;
1735 }
2c4a488a 1736 }
c6cc94df
FW		 1737
1738 nft_trans_chain_name(trans) = name;
2c4a488a
PNA		 1739 }
1740 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1741
1742 return 0;
c6cc94df
FW		 1743err:
1744 free_percpu(stats);
1745 kfree(trans);
1746 return err;
2c4a488a
PNA		 1747}
1748
633c9a84
PNA		 1749static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1750 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 1751 const struct nlattr * const nla[],
1752 struct netlink_ext_ack *extack)
96518518
PM		 1753{
1754 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4035285f
PNA		 1755 u8 genmask = nft_genmask_next(net);
1756 int family = nfmsg->nfgen_family;
36dd1bcc 1757 const struct nlattr *attr;
96518518
PM		 1758 struct nft_table *table;
1759 struct nft_chain *chain;
57de2a0c 1760 u8 policy = NF_ACCEPT;
4035285f 1761 struct nft_ctx ctx;
96518518 1762 u64 handle = 0;
96518518 1763
f102d66b
FW		 1764 lockdep_assert_held(&net->nft.commit_mutex);
1765
cac20fcd 1766 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
36dd1bcc
PNA		 1767 if (IS_ERR(table)) {
1768 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
96518518 1769 return PTR_ERR(table);
36dd1bcc 1770 }
96518518 1771
96518518 1772 chain = NULL;
36dd1bcc 1773 attr = nla[NFTA_CHAIN_NAME];
96518518
PM		 1774
1775 if (nla[NFTA_CHAIN_HANDLE]) {
1776 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
cac20fcd 1777 chain = nft_chain_lookup_byhandle(table, handle, genmask);
36dd1bcc
PNA		 1778 if (IS_ERR(chain)) {
1779 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
96518518 1780 return PTR_ERR(chain);
36dd1bcc
PNA		 1781 }
1782 attr = nla[NFTA_CHAIN_HANDLE];
96518518 1783 } else {
f102d66b 1784 chain = nft_chain_lookup(net, table, attr, genmask);
96518518 1785 if (IS_ERR(chain)) {
36dd1bcc
PNA		 1786 if (PTR_ERR(chain) != -ENOENT) {
1787 NL_SET_BAD_ATTR(extack, attr);
96518518 1788 return PTR_ERR(chain);
36dd1bcc 1789 }
96518518
PM		 1790 chain = NULL;
1791 }
1792 }
1793
57de2a0c 1794 if (nla[NFTA_CHAIN_POLICY]) {
f323d954 1795 if (chain != NULL &&
36dd1bcc
PNA		 1796 !nft_is_base_chain(chain)) {
1797 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
d6b6cb1d 1798 return -EOPNOTSUPP;
36dd1bcc 1799 }
d6b6cb1d
PNA		 1800
1801 if (chain == NULL &&
36dd1bcc
PNA		 1802 nla[NFTA_CHAIN_HOOK] == NULL) {
1803 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
57de2a0c 1804 return -EOPNOTSUPP;
36dd1bcc 1805 }
57de2a0c 1806
8f46df18 1807 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
57de2a0c
PM		 1808 switch (policy) {
1809 case NF_DROP:
1810 case NF_ACCEPT:
1811 break;
1812 default:
1813 return -EINVAL;
1814 }
1815 }
1816
98319cb9 1817 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
4035285f 1818
96518518 1819 if (chain != NULL) {
36dd1bcc
PNA		 1820 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1821 NL_SET_BAD_ATTR(extack, attr);
96518518 1822 return -EEXIST;
36dd1bcc 1823 }
96518518
PM		 1824 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1825 return -EOPNOTSUPP;
1826
445509eb 1827 return nf_tables_updchain(&ctx, genmask, policy);
96518518
PM		 1828 }
1829
445509eb 1830 return nf_tables_addchain(&ctx, family, genmask, policy);
96518518
PM		 1831}
1832
633c9a84
PNA		 1833static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1834 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 1835 const struct nlattr * const nla[],
1836 struct netlink_ext_ack *extack)
96518518
PM		 1837{
1838 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1839 u8 genmask = nft_genmask_next(net);
36dd1bcc
PNA		 1840 int family = nfmsg->nfgen_family;
1841 const struct nlattr *attr;
96518518
PM		 1842 struct nft_table *table;
1843 struct nft_chain *chain;
9dee1474 1844 struct nft_rule *rule;
91c7b38d 1845 struct nft_ctx ctx;
3ecbfd65 1846 u64 handle;
9dee1474
PNA		 1847 u32 use;
1848 int err;
96518518 1849
cac20fcd 1850 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
36dd1bcc
PNA		 1851 if (IS_ERR(table)) {
1852 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
96518518 1853 return PTR_ERR(table);
36dd1bcc 1854 }
96518518 1855
3ecbfd65 1856 if (nla[NFTA_CHAIN_HANDLE]) {
36dd1bcc
PNA		 1857 attr = nla[NFTA_CHAIN_HANDLE];
1858 handle = be64_to_cpu(nla_get_be64(attr));
cac20fcd 1859 chain = nft_chain_lookup_byhandle(table, handle, genmask);
3ecbfd65 1860 } else {
36dd1bcc 1861 attr = nla[NFTA_CHAIN_NAME];
f102d66b 1862 chain = nft_chain_lookup(net, table, attr, genmask);
3ecbfd65 1863 }
36dd1bcc
PNA		 1864 if (IS_ERR(chain)) {
1865 NL_SET_BAD_ATTR(extack, attr);
96518518 1866 return PTR_ERR(chain);
36dd1bcc 1867 }
9dee1474
PNA		 1868
1869 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1870 chain->use > 0)
96518518
PM		 1871 return -EBUSY;
1872
98319cb9 1873 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
0165d932 1874
9dee1474
PNA		 1875 use = chain->use;
1876 list_for_each_entry(rule, &chain->rules, list) {
1877 if (!nft_is_active_next(net, rule))
1878 continue;
1879 use--;
1880
1881 err = nft_delrule(&ctx, rule);
1882 if (err < 0)
1883 return err;
1884 }
1885
1886 /* There are rules and elements that are still holding references to us,
1887 * we cannot do a recursive removal in this case.
1888 */
36dd1bcc
PNA		 1889 if (use > 0) {
1890 NL_SET_BAD_ATTR(extack, attr);
9dee1474 1891 return -EBUSY;
36dd1bcc 1892 }
9dee1474 1893
ee01d542 1894 return nft_delchain(&ctx);
96518518
PM		 1895}
1896
96518518
PM		 1897/*
1898 * Expressions
1899 */
1900
1901/**
ef1f7df9
PM		 1902 * nft_register_expr - register nf_tables expr type
1903 * @ops: expr type
96518518 1904 *
ef1f7df9 1905 * Registers the expr type for use with nf_tables. Returns zero on
96518518
PM		 1906 * success or a negative errno code otherwise.
1907 */
ef1f7df9 1908int nft_register_expr(struct nft_expr_type *type)
96518518
PM		 1909{
1910 nfnl_lock(NFNL_SUBSYS_NFTABLES);
758dbcec 1911 if (type->family == NFPROTO_UNSPEC)
e688a7f8 1912 list_add_tail_rcu(&type->list, &nf_tables_expressions);
758dbcec 1913 else
e688a7f8 1914 list_add_rcu(&type->list, &nf_tables_expressions);
96518518
PM		 1915 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1916 return 0;
1917}
1918EXPORT_SYMBOL_GPL(nft_register_expr);
1919
1920/**
ef1f7df9
PM		 1921 * nft_unregister_expr - unregister nf_tables expr type
1922 * @ops: expr type
96518518 1923 *
ef1f7df9 1924 * Unregisters the expr typefor use with nf_tables.
96518518 1925 */
ef1f7df9 1926void nft_unregister_expr(struct nft_expr_type *type)
96518518
PM		 1927{
1928 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 1929 list_del_rcu(&type->list);
96518518
PM		 1930 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1931}
1932EXPORT_SYMBOL_GPL(nft_unregister_expr);
1933
64d46806
PM		 1934static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1935 struct nlattr *nla)
96518518 1936{
ef1f7df9 1937 const struct nft_expr_type *type;
96518518 1938
ef1f7df9 1939 list_for_each_entry(type, &nf_tables_expressions, list) {
64d46806
PM		 1940 if (!nla_strcmp(nla, type->name) &&
1941 (!type->family || type->family == family))
ef1f7df9 1942 return type;
96518518
PM		 1943 }
1944 return NULL;
1945}
1946
452238e8
FW		 1947static const struct nft_expr_type *nft_expr_type_get(struct net *net,
1948 u8 family,
64d46806 1949 struct nlattr *nla)
96518518 1950{
ef1f7df9 1951 const struct nft_expr_type *type;
96518518
PM		 1952
1953 if (nla == NULL)
1954 return ERR_PTR(-EINVAL);
1955
64d46806 1956 type = __nft_expr_type_get(family, nla);
ef1f7df9
PM		 1957 if (type != NULL && try_module_get(type->owner))
1958 return type;
96518518 1959
f102d66b 1960 lockdep_nfnl_nft_mutex_not_held();
96518518 1961#ifdef CONFIG_MODULES
ef1f7df9 1962 if (type == NULL) {
452238e8
FW		 1963 nft_request_module(net, "nft-expr-%u-%.*s", family,
1964 nla_len(nla), (char *)nla_data(nla));
64d46806
PM		 1965 if (__nft_expr_type_get(family, nla))
1966 return ERR_PTR(-EAGAIN);
1967
452238e8
FW		 1968 nft_request_module(net, "nft-expr-%.*s",
1969 nla_len(nla), (char *)nla_data(nla));
64d46806 1970 if (__nft_expr_type_get(family, nla))
96518518
PM		 1971 return ERR_PTR(-EAGAIN);
1972 }
1973#endif
1974 return ERR_PTR(-ENOENT);
1975}
1976
1977static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1978 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1979 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1980};
1981
1982static int nf_tables_fill_expr_info(struct sk_buff *skb,
1983 const struct nft_expr *expr)
1984{
ef1f7df9 1985 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
96518518
PM		 1986 goto nla_put_failure;
1987
1988 if (expr->ops->dump) {
1989 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1990 if (data == NULL)
1991 goto nla_put_failure;
1992 if (expr->ops->dump(skb, expr) < 0)
1993 goto nla_put_failure;
1994 nla_nest_end(skb, data);
1995 }
1996
1997 return skb->len;
1998
1999nla_put_failure:
2000 return -1;
2001};
2002
0b2d8a7b
PM		 2003int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2004 const struct nft_expr *expr)
2005{
2006 struct nlattr *nest;
2007
2008 nest = nla_nest_start(skb, attr);
2009 if (!nest)
2010 goto nla_put_failure;
2011 if (nf_tables_fill_expr_info(skb, expr) < 0)
2012 goto nla_put_failure;
2013 nla_nest_end(skb, nest);
2014 return 0;
2015
2016nla_put_failure:
2017 return -1;
2018}
2019
96518518
PM		 2020struct nft_expr_info {
2021 const struct nft_expr_ops *ops;
ef1f7df9 2022 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
96518518
PM		 2023};
2024
0ca743a5
PNA		 2025static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2026 const struct nlattr *nla,
96518518
PM		 2027 struct nft_expr_info *info)
2028{
ef1f7df9 2029 const struct nft_expr_type *type;
96518518 2030 const struct nft_expr_ops *ops;
ef1f7df9 2031 struct nlattr *tb[NFTA_EXPR_MAX + 1];
96518518
PM		 2032 int err;
2033
fceb6435 2034 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL);
96518518
PM		 2035 if (err < 0)
2036 return err;
2037
452238e8 2038 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
ef1f7df9
PM		 2039 if (IS_ERR(type))
2040 return PTR_ERR(type);
2041
2042 if (tb[NFTA_EXPR_DATA]) {
2043 err = nla_parse_nested(info->tb, type->maxattr,
fceb6435 2044 tb[NFTA_EXPR_DATA], type->policy, NULL);
ef1f7df9
PM		 2045 if (err < 0)
2046 goto err1;
2047 } else
2048 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2049
2050 if (type->select_ops != NULL) {
0ca743a5
PNA		 2051 ops = type->select_ops(ctx,
2052 (const struct nlattr * const *)info->tb);
ef1f7df9
PM		 2053 if (IS_ERR(ops)) {
2054 err = PTR_ERR(ops);
2055 goto err1;
2056 }
2057 } else
2058 ops = type->ops;
2059
96518518
PM		 2060 info->ops = ops;
2061 return 0;
ef1f7df9
PM		 2062
2063err1:
2064 module_put(type->owner);
2065 return err;
96518518
PM		 2066}
2067
2068static int nf_tables_newexpr(const struct nft_ctx *ctx,
ef1f7df9 2069 const struct nft_expr_info *info,
96518518
PM		 2070 struct nft_expr *expr)
2071{
2072 const struct nft_expr_ops *ops = info->ops;
2073 int err;
2074
2075 expr->ops = ops;
2076 if (ops->init) {
ef1f7df9 2077 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
96518518
PM		 2078 if (err < 0)
2079 goto err1;
2080 }
2081
96518518 2082 return 0;
96518518
PM		 2083err1:
2084 expr->ops = NULL;
2085 return err;
2086}
2087
62472bce
PM		 2088static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2089 struct nft_expr *expr)
96518518
PM		 2090{
2091 if (expr->ops->destroy)
62472bce 2092 expr->ops->destroy(ctx, expr);
ef1f7df9 2093 module_put(expr->ops->type->owner);
96518518
PM		 2094}
2095
0b2d8a7b
PM		 2096struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2097 const struct nlattr *nla)
2098{
2099 struct nft_expr_info info;
2100 struct nft_expr *expr;
2101 int err;
2102
2103 err = nf_tables_expr_parse(ctx, nla, &info);
2104 if (err < 0)
2105 goto err1;
2106
2107 err = -ENOMEM;
2108 expr = kzalloc(info.ops->size, GFP_KERNEL);
2109 if (expr == NULL)
2110 goto err2;
2111
2112 err = nf_tables_newexpr(ctx, &info, expr);
2113 if (err < 0)
6cafaf47 2114 goto err3;
0b2d8a7b
PM		 2115
2116 return expr;
6cafaf47
LZ		 2117err3:
2118 kfree(expr);
0b2d8a7b
PM		 2119err2:
2120 module_put(info.ops->type->owner);
2121err1:
2122 return ERR_PTR(err);
2123}
2124
2125void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2126{
2127 nf_tables_expr_destroy(ctx, expr);
2128 kfree(expr);
2129}
2130
96518518
PM		 2131/*
2132 * Rules
2133 */
2134
cac20fcd
PNA		 2135static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2136 u64 handle)
96518518
PM		 2137{
2138 struct nft_rule *rule;
2139
2140 // FIXME: this sucks
d9adf22a 2141 list_for_each_entry_rcu(rule, &chain->rules, list) {
96518518
PM		 2142 if (handle == rule->handle)
2143 return rule;
2144 }
2145
2146 return ERR_PTR(-ENOENT);
2147}
2148
cac20fcd
PNA		 2149static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2150 const struct nlattr *nla)
96518518
PM		 2151{
2152 if (nla == NULL)
2153 return ERR_PTR(-EINVAL);
2154
cac20fcd 2155 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
96518518
PM		 2156}
2157
2158static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
b2fbd044
LZ		 2159 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2160 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 2161 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2162 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2163 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2164 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
0ca743a5 2165 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
5e948466 2166 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
0768b3b3
PNA		 2167 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2168 .len = NFT_USERDATA_MAXLEN },
467697d2 2169 [NFTA_RULE_ID] = { .type = NLA_U32 },
96518518
PM		 2170};
2171
84d7fce6
PNA		 2172static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2173 u32 portid, u32 seq, int event,
2174 u32 flags, int family,
96518518
PM		 2175 const struct nft_table *table,
2176 const struct nft_chain *chain,
2177 const struct nft_rule *rule)
2178{
2179 struct nlmsghdr *nlh;
2180 struct nfgenmsg *nfmsg;
2181 const struct nft_expr *expr, *next;
2182 struct nlattr *list;
5e948466 2183 const struct nft_rule *prule;
dedb67c4 2184 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518 2185
dedb67c4 2186 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
96518518
PM		 2187 if (nlh == NULL)
2188 goto nla_put_failure;
2189
2190 nfmsg = nlmsg_data(nlh);
2191 nfmsg->nfgen_family = family;
2192 nfmsg->version = NFNETLINK_V0;
84d7fce6 2193 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 2194
2195 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2196 goto nla_put_failure;
2197 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2198 goto nla_put_failure;
b46f6ded
ND		 2199 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2200 NFTA_RULE_PAD))
96518518
PM		 2201 goto nla_put_failure;
2202
5e948466 2203 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
cbbb40e2 2204 prule = list_prev_entry(rule, list);
5e948466 2205 if (nla_put_be64(skb, NFTA_RULE_POSITION,
b46f6ded
ND		 2206 cpu_to_be64(prule->handle),
2207 NFTA_RULE_PAD))
5e948466
EL		 2208 goto nla_put_failure;
2209 }
2210
96518518
PM		 2211 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
2212 if (list == NULL)
2213 goto nla_put_failure;
2214 nft_rule_for_each_expr(expr, next, rule) {
0b2d8a7b 2215 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
96518518 2216 goto nla_put_failure;
96518518
PM		 2217 }
2218 nla_nest_end(skb, list);
2219
86f1ec32
PM		 2220 if (rule->udata) {
2221 struct nft_userdata *udata = nft_userdata(rule);
2222 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2223 udata->data) < 0)
2224 goto nla_put_failure;
2225 }
0768b3b3 2226
053c095a
JB		 2227 nlmsg_end(skb, nlh);
2228 return 0;
96518518
PM		 2229
2230nla_put_failure:
2231 nlmsg_trim(skb, nlh);
2232 return -1;
2233}
2234
25e94a99
PNA		 2235static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2236 const struct nft_rule *rule, int event)
96518518
PM		 2237{
2238 struct sk_buff *skb;
96518518
PM		 2239 int err;
2240
128ad332
PNA		 2241 if (!ctx->report &&
2242 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 2243 return;
96518518 2244
96518518
PM		 2245 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2246 if (skb == NULL)
2247 goto err;
2248
84d7fce6 2249 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
36596dad 2250 event, 0, ctx->family, ctx->table,
35151d84 2251 ctx->chain, rule);
96518518
PM		 2252 if (err < 0) {
2253 kfree_skb(skb);
2254 goto err;
2255 }
2256
25e94a99
PNA		 2257 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2258 ctx->report, GFP_KERNEL);
2259 return;
96518518 2260err:
25e94a99 2261 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 2262}
2263
6e1f760e 2264struct nft_rule_dump_ctx {
e46abbcc 2265 char *table;
b7263e07 2266 char *chain;
6e1f760e
PNA		 2267};
2268
96518518
PM		 2269static int nf_tables_dump_rules(struct sk_buff *skb,
2270 struct netlink_callback *cb)
2271{
2272 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6e1f760e 2273 const struct nft_rule_dump_ctx *ctx = cb->data;
96518518
PM		 2274 const struct nft_table *table;
2275 const struct nft_chain *chain;
2276 const struct nft_rule *rule;
2277 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 2278 struct net *net = sock_net(skb->sk);
96518518
PM		 2279 int family = nfmsg->nfgen_family;
2280
e688a7f8 2281 rcu_read_lock();
38e029f1
PNA		 2282 cb->seq = net->nft.base_seq;
2283
36596dad 2284 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 2285 if (family != NFPROTO_UNSPEC && family != table->family)
36596dad
PNA		 2286 continue;
2287
2288 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
96518518
PM		 2289 continue;
2290
36596dad
PNA		 2291 list_for_each_entry_rcu(chain, &table->chains, list) {
2292 if (ctx && ctx->chain &&
2293 strcmp(ctx->chain, chain->name) != 0)
6e1f760e
PNA		 2294 continue;
2295
36596dad
PNA		 2296 list_for_each_entry_rcu(rule, &chain->rules, list) {
2297 if (!nft_is_active(net, rule))
2298 goto cont;
2299 if (idx < s_idx)
2300 goto cont;
2301 if (idx > s_idx)
2302 memset(&cb->args[1], 0,
2303 sizeof(cb->args) - sizeof(cb->args[0]));
2304 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2305 cb->nlh->nlmsg_seq,
2306 NFT_MSG_NEWRULE,
2307 NLM_F_MULTI | NLM_F_APPEND,
98319cb9 2308 table->family,
36596dad
PNA		 2309 table, chain, rule) < 0)
2310 goto done;
2311
2312 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518 2313cont:
36596dad 2314 idx++;
96518518
PM		 2315 }
2316 }
2317 }
2318done:
e688a7f8
PNA		 2319 rcu_read_unlock();
2320
96518518
PM		 2321 cb->args[0] = idx;
2322 return skb->len;
2323}
2324
90fd131a
FW		 2325static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2326{
2327 const struct nlattr * const *nla = cb->data;
2328 struct nft_rule_dump_ctx *ctx = NULL;
2329
2330 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2331 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2332 if (!ctx)
2333 return -ENOMEM;
2334
2335 if (nla[NFTA_RULE_TABLE]) {
2336 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2337 GFP_ATOMIC);
2338 if (!ctx->table) {
2339 kfree(ctx);
2340 return -ENOMEM;
2341 }
2342 }
2343 if (nla[NFTA_RULE_CHAIN]) {
2344 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2345 GFP_ATOMIC);
2346 if (!ctx->chain) {
2347 kfree(ctx->table);
2348 kfree(ctx);
2349 return -ENOMEM;
2350 }
2351 }
2352 }
2353
2354 cb->data = ctx;
2355 return 0;
2356}
2357
6e1f760e
PNA		 2358static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2359{
e46abbcc
PS		 2360 struct nft_rule_dump_ctx *ctx = cb->data;
2361
2362 if (ctx) {
2363 kfree(ctx->table);
b7263e07 2364 kfree(ctx->chain);
e46abbcc
PS		 2365 kfree(ctx);
2366 }
6e1f760e
PNA		 2367 return 0;
2368}
2369
d9adf22a 2370/* called with rcu_read_lock held */
7b8002a1
PNA		 2371static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2372 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2373 const struct nlattr * const nla[],
2374 struct netlink_ext_ack *extack)
96518518
PM		 2375{
2376 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2377 u8 genmask = nft_genmask_cur(net);
96518518
PM		 2378 const struct nft_chain *chain;
2379 const struct nft_rule *rule;
1b2470e5 2380 struct nft_table *table;
96518518
PM		 2381 struct sk_buff *skb2;
2382 int family = nfmsg->nfgen_family;
2383 int err;
2384
2385 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2386 struct netlink_dump_control c = {
90fd131a 2387 .start= nf_tables_dump_rules_start,
96518518 2388 .dump = nf_tables_dump_rules,
6e1f760e 2389 .done = nf_tables_dump_rules_done,
d9adf22a 2390 .module = THIS_MODULE,
90fd131a 2391 .data = (void *)nla,
96518518 2392 };
6e1f760e 2393
d9adf22a 2394 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
96518518
PM		 2395 }
2396
cac20fcd 2397 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
36dd1bcc
PNA		 2398 if (IS_ERR(table)) {
2399 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
96518518 2400 return PTR_ERR(table);
36dd1bcc 2401 }
96518518 2402
f102d66b 2403 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
36dd1bcc
PNA		 2404 if (IS_ERR(chain)) {
2405 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
96518518 2406 return PTR_ERR(chain);
36dd1bcc 2407 }
96518518 2408
cac20fcd 2409 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
36dd1bcc
PNA		 2410 if (IS_ERR(rule)) {
2411 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
96518518 2412 return PTR_ERR(rule);
36dd1bcc 2413 }
96518518 2414
d9adf22a 2415 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
96518518
PM		 2416 if (!skb2)
2417 return -ENOMEM;
2418
84d7fce6 2419 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 2420 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2421 family, table, chain, rule);
2422 if (err < 0)
2423 goto err;
2424
2425 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2426
2427err:
2428 kfree_skb(skb2);
2429 return err;
2430}
2431
62472bce
PM		 2432static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2433 struct nft_rule *rule)
96518518 2434{
96518518
PM		 2435 struct nft_expr *expr;
2436
f102d66b 2437 lockdep_assert_held(&ctx->net->nft.commit_mutex);
96518518
PM		 2438 /*
2439 * Careful: some expressions might not be initialized in case this
2440 * is called on error from nf_tables_newrule().
2441 */
2442 expr = nft_expr_first(rule);
3e38df13 2443 while (expr != nft_expr_last(rule) && expr->ops) {
62472bce 2444 nf_tables_expr_destroy(ctx, expr);
96518518
PM		 2445 expr = nft_expr_next(expr);
2446 }
2447 kfree(rule);
2448}
2449
bb7b40ae
PNA		 2450static void nf_tables_rule_release(const struct nft_ctx *ctx,
2451 struct nft_rule *rule)
2452{
2453 nft_rule_expr_deactivate(ctx, rule);
2454 nf_tables_rule_destroy(ctx, rule);
2455}
2456
a654de8f
PNA		 2457int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
2458{
2459 struct nft_expr *expr, *last;
2460 const struct nft_data *data;
2461 struct nft_rule *rule;
2462 int err;
2463
26b2f552
TY		 2464 if (ctx->level == NFT_JUMP_STACK_SIZE)
2465 return -EMLINK;
2466
a654de8f
PNA		 2467 list_for_each_entry(rule, &chain->rules, list) {
2468 if (!nft_is_active_next(ctx->net, rule))
2469 continue;
2470
2471 nft_rule_for_each_expr(expr, last, rule) {
2472 if (!expr->ops->validate)
2473 continue;
2474
2475 err = expr->ops->validate(ctx, expr, &data);
2476 if (err < 0)
2477 return err;
2478 }
2479 }
2480
2481 return 0;
2482}
2483EXPORT_SYMBOL_GPL(nft_chain_validate);
2484
2485static int nft_table_validate(struct net *net, const struct nft_table *table)
2486{
2487 struct nft_chain *chain;
2488 struct nft_ctx ctx = {
2489 .net = net,
2490 .family = table->family,
2491 };
2492 int err;
2493
2494 list_for_each_entry(chain, &table->chains, list) {
2495 if (!nft_is_base_chain(chain))
2496 continue;
2497
2498 ctx.chain = chain;
2499 err = nft_chain_validate(&ctx, chain);
2500 if (err < 0)
2501 return err;
2502 }
2503
2504 return 0;
2505}
2506
1081d11b
PNA		 2507#define NFT_RULE_MAXEXPRS 128
2508
633c9a84
PNA		 2509static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2510 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2511 const struct nlattr * const nla[],
2512 struct netlink_ext_ack *extack)
96518518
PM		 2513{
2514 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2515 u8 genmask = nft_genmask_next(net);
2a43ecf9 2516 struct nft_expr_info *info = NULL;
98319cb9 2517 int family = nfmsg->nfgen_family;
96518518
PM		 2518 struct nft_table *table;
2519 struct nft_chain *chain;
2520 struct nft_rule *rule, *old_rule = NULL;
86f1ec32 2521 struct nft_userdata *udata;
1081d11b 2522 struct nft_trans *trans = NULL;
96518518
PM		 2523 struct nft_expr *expr;
2524 struct nft_ctx ctx;
2525 struct nlattr *tmp;
86f1ec32 2526 unsigned int size, i, n, ulen = 0, usize = 0;
96518518 2527 int err, rem;
5e948466 2528 u64 handle, pos_handle;
96518518 2529
f102d66b
FW		 2530 lockdep_assert_held(&net->nft.commit_mutex);
2531
cac20fcd 2532 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
36dd1bcc
PNA		 2533 if (IS_ERR(table)) {
2534 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
96518518 2535 return PTR_ERR(table);
36dd1bcc 2536 }
96518518 2537
f102d66b 2538 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
36dd1bcc
PNA		 2539 if (IS_ERR(chain)) {
2540 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
96518518 2541 return PTR_ERR(chain);
36dd1bcc 2542 }
96518518
PM		 2543
2544 if (nla[NFTA_RULE_HANDLE]) {
2545 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
cac20fcd 2546 rule = __nft_rule_lookup(chain, handle);
36dd1bcc
PNA		 2547 if (IS_ERR(rule)) {
2548 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
96518518 2549 return PTR_ERR(rule);
36dd1bcc 2550 }
96518518 2551
36dd1bcc
PNA		 2552 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2553 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
96518518 2554 return -EEXIST;
36dd1bcc 2555 }
96518518
PM		 2556 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2557 old_rule = rule;
2558 else
2559 return -EOPNOTSUPP;
2560 } else {
445509eb
PNA		 2561 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
2562 nlh->nlmsg_flags & NLM_F_REPLACE)
96518518
PM		 2563 return -EINVAL;
2564 handle = nf_tables_alloc_handle(table);
a0a7379e
PNA		 2565
2566 if (chain->use == UINT_MAX)
2567 return -EOVERFLOW;
96518518
PM		 2568 }
2569
5e948466
EL		 2570 if (nla[NFTA_RULE_POSITION]) {
2571 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2572 return -EOPNOTSUPP;
2573
2574 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
cac20fcd 2575 old_rule = __nft_rule_lookup(chain, pos_handle);
36dd1bcc
PNA		 2576 if (IS_ERR(old_rule)) {
2577 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
5e948466 2578 return PTR_ERR(old_rule);
36dd1bcc 2579 }
5e948466
EL		 2580 }
2581
98319cb9 2582 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
0ca743a5 2583
96518518
PM		 2584 n = 0;
2585 size = 0;
2586 if (nla[NFTA_RULE_EXPRESSIONS]) {
2a43ecf9
FW		 2587 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
2588 sizeof(struct nft_expr_info),
2589 GFP_KERNEL);
2590 if (!info)
2591 return -ENOMEM;
2592
96518518
PM		 2593 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2594 err = -EINVAL;
2595 if (nla_type(tmp) != NFTA_LIST_ELEM)
2596 goto err1;
2597 if (n == NFT_RULE_MAXEXPRS)
2598 goto err1;
0ca743a5 2599 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
96518518
PM		 2600 if (err < 0)
2601 goto err1;
2602 size += info[n].ops->size;
2603 n++;
2604 }
2605 }
9889840f
PM		 2606 /* Check for overflow of dlen field */
2607 err = -EFBIG;
2608 if (size >= 1 << 12)
2609 goto err1;
96518518 2610
86f1ec32 2611 if (nla[NFTA_RULE_USERDATA]) {
0768b3b3 2612 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
86f1ec32
PM		 2613 if (ulen > 0)
2614 usize = sizeof(struct nft_userdata) + ulen;
2615 }
0768b3b3 2616
96518518 2617 err = -ENOMEM;
86f1ec32 2618 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
96518518
PM		 2619 if (rule == NULL)
2620 goto err1;
2621
889f7ee7 2622 nft_activate_next(net, rule);
0628b123 2623
96518518
PM		 2624 rule->handle = handle;
2625 rule->dlen = size;
86f1ec32 2626 rule->udata = ulen ? 1 : 0;
0768b3b3 2627
86f1ec32
PM		 2628 if (ulen) {
2629 udata = nft_userdata(rule);
2630 udata->len = ulen - 1;
2631 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2632 }
96518518 2633
96518518
PM		 2634 expr = nft_expr_first(rule);
2635 for (i = 0; i < n; i++) {
2636 err = nf_tables_newexpr(&ctx, &info[i], expr);
2637 if (err < 0)
2638 goto err2;
a654de8f
PNA		 2639
2640 if (info[i].ops->validate)
2641 nft_validate_state_update(net, NFT_VALIDATE_NEED);
2642
ef1f7df9 2643 info[i].ops = NULL;
96518518
PM		 2644 expr = nft_expr_next(expr);
2645 }
2646
96518518 2647 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
569ccae6 2648 if (!nft_is_active_next(net, old_rule)) {
0628b123
PNA		 2649 err = -ENOENT;
2650 goto err2;
2651 }
569ccae6
FW		 2652 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2653 old_rule);
2654 if (trans == NULL) {
2655 err = -ENOMEM;
2656 goto err2;
2657 }
2658 nft_deactivate_next(net, old_rule);
2659 chain->use--;
96518518 2660
569ccae6
FW		 2661 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2662 err = -ENOMEM;
2663 goto err2;
2664 }
2665
2666 list_add_tail_rcu(&rule->list, &old_rule->list);
2667 } else {
2668 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2669 err = -ENOMEM;
2670 goto err2;
2671 }
2672
2673 if (nlh->nlmsg_flags & NLM_F_APPEND) {
2674 if (old_rule)
2675 list_add_rcu(&rule->list, &old_rule->list);
2676 else
2677 list_add_tail_rcu(&rule->list, &chain->rules);
2678 } else {
2679 if (old_rule)
2680 list_add_tail_rcu(&rule->list, &old_rule->list);
2681 else
2682 list_add_rcu(&rule->list, &chain->rules);
2683 }
0628b123 2684 }
2a43ecf9 2685 kvfree(info);
4fefee57 2686 chain->use++;
96518518 2687
a654de8f
PNA		 2688 if (net->nft.validate_state == NFT_VALIDATE_DO)
2689 return nft_table_validate(net, table);
2690
2691 return 0;
96518518 2692err2:
bb7b40ae 2693 nf_tables_rule_release(&ctx, rule);
96518518
PM		 2694err1:
2695 for (i = 0; i < n; i++) {
2696 if (info[i].ops != NULL)
ef1f7df9 2697 module_put(info[i].ops->type->owner);
96518518 2698 }
2a43ecf9 2699 kvfree(info);
96518518
PM		 2700 return err;
2701}
2702
1a94e38d
PNA		 2703static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2704 const struct nlattr *nla)
2705{
2706 u32 id = ntohl(nla_get_be32(nla));
2707 struct nft_trans *trans;
2708
2709 list_for_each_entry(trans, &net->nft.commit_list, list) {
2710 struct nft_rule *rule = nft_trans_rule(trans);
2711
2712 if (trans->msg_type == NFT_MSG_NEWRULE &&
2713 id == nft_trans_rule_id(trans))
2714 return rule;
2715 }
2716 return ERR_PTR(-ENOENT);
2717}
2718
633c9a84
PNA		 2719static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2720 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2721 const struct nlattr * const nla[],
2722 struct netlink_ext_ack *extack)
96518518
PM		 2723{
2724 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2725 u8 genmask = nft_genmask_next(net);
7c95f6d8 2726 struct nft_table *table;
cf9dc09d
PNA		 2727 struct nft_chain *chain = NULL;
2728 struct nft_rule *rule;
0628b123
PNA		 2729 int family = nfmsg->nfgen_family, err = 0;
2730 struct nft_ctx ctx;
96518518 2731
cac20fcd 2732 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
36dd1bcc
PNA		 2733 if (IS_ERR(table)) {
2734 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
96518518 2735 return PTR_ERR(table);
36dd1bcc 2736 }
96518518 2737
cf9dc09d 2738 if (nla[NFTA_RULE_CHAIN]) {
f102d66b
FW		 2739 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
2740 genmask);
36dd1bcc
PNA		 2741 if (IS_ERR(chain)) {
2742 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
cf9dc09d 2743 return PTR_ERR(chain);
36dd1bcc 2744 }
cf9dc09d 2745 }
96518518 2746
98319cb9 2747 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
0628b123 2748
cf9dc09d
PNA		 2749 if (chain) {
2750 if (nla[NFTA_RULE_HANDLE]) {
cac20fcd 2751 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
36dd1bcc
PNA		 2752 if (IS_ERR(rule)) {
2753 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
cf9dc09d 2754 return PTR_ERR(rule);
36dd1bcc 2755 }
96518518 2756
1a94e38d
PNA		 2757 err = nft_delrule(&ctx, rule);
2758 } else if (nla[NFTA_RULE_ID]) {
2759 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
36dd1bcc
PNA		 2760 if (IS_ERR(rule)) {
2761 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
1a94e38d 2762 return PTR_ERR(rule);
36dd1bcc 2763 }
1a94e38d 2764
5e266fe7 2765 err = nft_delrule(&ctx, rule);
cf9dc09d 2766 } else {
ce24b721 2767 err = nft_delrule_by_chain(&ctx);
cf9dc09d
PNA		 2768 }
2769 } else {
2770 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 2771 if (!nft_is_active_next(net, chain))
2772 continue;
2773
cf9dc09d 2774 ctx.chain = chain;
ce24b721 2775 err = nft_delrule_by_chain(&ctx);
0628b123
PNA		 2776 if (err < 0)
2777 break;
2778 }
2779 }
2780
2781 return err;
2782}
2783
20a69341
PM		 2784/*
2785 * Sets
2786 */
2787
2b664957 2788static LIST_HEAD(nf_tables_set_types);
20a69341 2789
2b664957 2790int nft_register_set(struct nft_set_type *type)
20a69341
PM		 2791{
2792 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2b664957 2793 list_add_tail_rcu(&type->list, &nf_tables_set_types);
20a69341
PM		 2794 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2795 return 0;
2796}
2797EXPORT_SYMBOL_GPL(nft_register_set);
2798
2b664957 2799void nft_unregister_set(struct nft_set_type *type)
20a69341
PM		 2800{
2801 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2b664957 2802 list_del_rcu(&type->list);
20a69341
PM		 2803 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2804}
2805EXPORT_SYMBOL_GPL(nft_unregister_set);
2806
2b664957 2807#define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
71cc0873
PS		 2808 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
2809 NFT_SET_EVAL)
2b664957 2810
71cc0873 2811static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
2b664957 2812{
71cc0873 2813 return (flags & type->features) == (flags & NFT_SET_FEATURES);
2b664957
PNA		 2814}
2815
c50b960c
PM		 2816/*
2817 * Select a set implementation based on the data characteristics and the
2818 * given policy. The total memory use might not be known if no size is
2819 * given, in that case the amount of memory per element is used.
2820 */
2821static const struct nft_set_ops *
2b664957
PNA		 2822nft_select_set_ops(const struct nft_ctx *ctx,
2823 const struct nlattr * const nla[],
c50b960c
PM		 2824 const struct nft_set_desc *desc,
2825 enum nft_set_policies policy)
20a69341 2826{
c50b960c
PM		 2827 const struct nft_set_ops *ops, *bops;
2828 struct nft_set_estimate est, best;
2b664957
PNA		 2829 const struct nft_set_type *type;
2830 u32 flags = 0;
20a69341 2831
f102d66b
FW		 2832 lockdep_assert_held(&ctx->net->nft.commit_mutex);
2833 lockdep_nfnl_nft_mutex_not_held();
20a69341 2834#ifdef CONFIG_MODULES
2b664957 2835 if (list_empty(&nf_tables_set_types)) {
452238e8 2836 nft_request_module(ctx->net, "nft-set");
2b664957 2837 if (!list_empty(&nf_tables_set_types))
20a69341
PM		 2838 return ERR_PTR(-EAGAIN);
2839 }
2840#endif
2b664957
PNA		 2841 if (nla[NFTA_SET_FLAGS] != NULL)
2842 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
20a69341 2843
55af753c
PNA		 2844 bops = NULL;
2845 best.size = ~0;
2846 best.lookup = ~0;
0b5a7874 2847 best.space = ~0;
c50b960c 2848
2b664957 2849 list_for_each_entry(type, &nf_tables_set_types, list) {
71cc0873 2850 ops = &type->ops;
2b664957 2851
71cc0873 2852 if (!nft_set_ops_candidate(type, flags))
20a69341 2853 continue;
2b664957 2854 if (!ops->estimate(desc, flags, &est))
c50b960c
PM		 2855 continue;
2856
2857 switch (policy) {
2858 case NFT_SET_POL_PERFORMANCE:
55af753c 2859 if (est.lookup < best.lookup)
c50b960c 2860 break;
644e334e
PNA		 2861 if (est.lookup == best.lookup &&
2862 est.space < best.space)
2863 break;
c50b960c
PM		 2864 continue;
2865 case NFT_SET_POL_MEMORY:
0b5a7874
PNA		 2866 if (!desc->size) {
2867 if (est.space < best.space)
2868 break;
2869 if (est.space == best.space &&
2870 est.lookup < best.lookup)
2871 break;
4f2921ca 2872 } else if (est.size < best.size || !bops) {
c50b960c 2873 break;
0b5a7874 2874 }
c50b960c
PM		 2875 continue;
2876 default:
2877 break;
2878 }
2879
2b664957 2880 if (!try_module_get(type->owner))
20a69341 2881 continue;
c50b960c 2882 if (bops != NULL)
71cc0873 2883 module_put(to_set_type(bops)->owner);
c50b960c
PM		 2884
2885 bops = ops;
2886 best = est;
20a69341
PM		 2887 }
2888
c50b960c
PM		 2889 if (bops != NULL)
2890 return bops;
2891
20a69341
PM		 2892 return ERR_PTR(-EOPNOTSUPP);
2893}
2894
2895static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
b2fbd044
LZ		 2896 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2897 .len = NFT_TABLE_MAXNAMELEN - 1 },
a9bdd836 2898 [NFTA_SET_NAME] = { .type = NLA_STRING,
cb39ad8b 2899 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341
PM		 2900 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2901 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2902 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2903 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2904 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
c50b960c
PM		 2905 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2906 [NFTA_SET_DESC] = { .type = NLA_NESTED },
958bee14 2907 [NFTA_SET_ID] = { .type = NLA_U32 },
761da293
PM		 2908 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2909 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
e6d8ecac
CFG		 2910 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2911 .len = NFT_USERDATA_MAXLEN },
8aeff920 2912 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3ecbfd65 2913 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
c50b960c
PM		 2914};
2915
2916static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2917 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
20a69341
PM		 2918};
2919
633c9a84 2920static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 2921 const struct sk_buff *skb,
2922 const struct nlmsghdr *nlh,
f2a6d766 2923 const struct nlattr * const nla[],
36dd1bcc 2924 struct netlink_ext_ack *extack,
f2a6d766 2925 u8 genmask)
20a69341
PM		 2926{
2927 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
98319cb9 2928 int family = nfmsg->nfgen_family;
7c95f6d8 2929 struct nft_table *table = NULL;
20a69341 2930
20a69341 2931 if (nla[NFTA_SET_TABLE] != NULL) {
cac20fcd
PNA		 2932 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
2933 genmask);
36dd1bcc
PNA		 2934 if (IS_ERR(table)) {
2935 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
20a69341 2936 return PTR_ERR(table);
36dd1bcc 2937 }
20a69341
PM		 2938 }
2939
98319cb9 2940 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
20a69341
PM		 2941 return 0;
2942}
2943
cac20fcd
PNA		 2944static struct nft_set *nft_set_lookup(const struct nft_table *table,
2945 const struct nlattr *nla, u8 genmask)
20a69341
PM		 2946{
2947 struct nft_set *set;
2948
2949 if (nla == NULL)
2950 return ERR_PTR(-EINVAL);
2951
d9adf22a 2952 list_for_each_entry_rcu(set, &table->sets, list) {
37a9cc52
PNA		 2953 if (!nla_strcmp(nla, set->name) &&
2954 nft_active_genmask(set, genmask))
20a69341
PM		 2955 return set;
2956 }
2957 return ERR_PTR(-ENOENT);
2958}
2959
cac20fcd
PNA		 2960static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
2961 const struct nlattr *nla,
2962 u8 genmask)
3ecbfd65
HS		 2963{
2964 struct nft_set *set;
2965
3ecbfd65
HS		 2966 list_for_each_entry(set, &table->sets, list) {
2967 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
2968 nft_active_genmask(set, genmask))
2969 return set;
2970 }
2971 return ERR_PTR(-ENOENT);
2972}
2973
cac20fcd
PNA		 2974static struct nft_set *nft_set_lookup_byid(const struct net *net,
2975 const struct nlattr *nla, u8 genmask)
958bee14
PNA		 2976{
2977 struct nft_trans *trans;
2978 u32 id = ntohl(nla_get_be32(nla));
2979
2980 list_for_each_entry(trans, &net->nft.commit_list, list) {
9c7f96fd
AK		 2981 if (trans->msg_type == NFT_MSG_NEWSET) {
2982 struct nft_set *set = nft_trans_set(trans);
37a9cc52 2983
9c7f96fd
AK		 2984 if (id == nft_trans_set_id(trans) &&
2985 nft_active_genmask(set, genmask))
2986 return set;
2987 }
958bee14
PNA		 2988 }
2989 return ERR_PTR(-ENOENT);
2990}
c7a72e3f 2991
10659cba
PNA		 2992struct nft_set *nft_set_lookup_global(const struct net *net,
2993 const struct nft_table *table,
2994 const struct nlattr *nla_set_name,
2995 const struct nlattr *nla_set_id,
2996 u8 genmask)
c7a72e3f
PNA		 2997{
2998 struct nft_set *set;
2999
cac20fcd 3000 set = nft_set_lookup(table, nla_set_name, genmask);
c7a72e3f
PNA		 3001 if (IS_ERR(set)) {
3002 if (!nla_set_id)
3003 return set;
3004
cac20fcd 3005 set = nft_set_lookup_byid(net, nla_set_id, genmask);
c7a72e3f
PNA		 3006 }
3007 return set;
3008}
10659cba 3009EXPORT_SYMBOL_GPL(nft_set_lookup_global);
958bee14 3010
20a69341
PM		 3011static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3012 const char *name)
3013{
3014 const struct nft_set *i;
3015 const char *p;
3016 unsigned long *inuse;
60eb1894 3017 unsigned int n = 0, min = 0;
20a69341 3018
38745490 3019 p = strchr(name, '%');
20a69341
PM		 3020 if (p != NULL) {
3021 if (p[1] != 'd' || strchr(p + 2, '%'))
3022 return -EINVAL;
3023
3024 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3025 if (inuse == NULL)
3026 return -ENOMEM;
60eb1894 3027cont:
20a69341 3028 list_for_each_entry(i, &ctx->table->sets, list) {
14662917
DB		 3029 int tmp;
3030
37a9cc52
PNA		 3031 if (!nft_is_active_next(ctx->net, set))
3032 continue;
14662917 3033 if (!sscanf(i->name, name, &tmp))
20a69341 3034 continue;
60eb1894 3035 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
20a69341 3036 continue;
14662917 3037
60eb1894 3038 set_bit(tmp - min, inuse);
20a69341
PM		 3039 }
3040
53b70287 3041 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
60eb1894
PM		 3042 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3043 min += BITS_PER_BYTE * PAGE_SIZE;
3044 memset(inuse, 0, PAGE_SIZE);
3045 goto cont;
3046 }
20a69341
PM		 3047 free_page((unsigned long)inuse);
3048 }
3049
38745490
PS		 3050 set->name = kasprintf(GFP_KERNEL, name, min + n);
3051 if (!set->name)
3052 return -ENOMEM;
3053
20a69341 3054 list_for_each_entry(i, &ctx->table->sets, list) {
37a9cc52
PNA		 3055 if (!nft_is_active_next(ctx->net, i))
3056 continue;
e63aaaa6
AY		 3057 if (!strcmp(set->name, i->name)) {
3058 kfree(set->name);
20a69341 3059 return -ENFILE;
e63aaaa6 3060 }
20a69341
PM		 3061 }
3062 return 0;
3063}
3064
8e1102d5
FW		 3065static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3066{
3067 u64 ms = be64_to_cpu(nla_get_be64(nla));
3068 u64 max = (u64)(~((u64)0));
3069
3070 max = div_u64(max, NSEC_PER_MSEC);
3071 if (ms >= max)
3072 return -ERANGE;
3073
3074 ms *= NSEC_PER_MSEC;
3075 *result = nsecs_to_jiffies64(ms);
3076 return 0;
3077}
3078
d6501de8 3079static __be64 nf_jiffies64_to_msecs(u64 input)
8e1102d5
FW		 3080{
3081 u64 ms = jiffies64_to_nsecs(input);
3082
3083 return cpu_to_be64(div_u64(ms, NSEC_PER_MSEC));
3084}
3085
20a69341
PM		 3086static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3087 const struct nft_set *set, u16 event, u16 flags)
3088{
3089 struct nfgenmsg *nfmsg;
3090 struct nlmsghdr *nlh;
c50b960c 3091 struct nlattr *desc;
128ad332
PNA		 3092 u32 portid = ctx->portid;
3093 u32 seq = ctx->seq;
20a69341 3094
dedb67c4 3095 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
20a69341
PM		 3096 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3097 flags);
3098 if (nlh == NULL)
3099 goto nla_put_failure;
3100
3101 nfmsg = nlmsg_data(nlh);
36596dad 3102 nfmsg->nfgen_family = ctx->family;
20a69341 3103 nfmsg->version = NFNETLINK_V0;
84d7fce6 3104 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
20a69341
PM		 3105
3106 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3107 goto nla_put_failure;
3108 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3109 goto nla_put_failure;
3ecbfd65
HS		 3110 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3111 NFTA_SET_PAD))
3112 goto nla_put_failure;
20a69341
PM		 3113 if (set->flags != 0)
3114 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3115 goto nla_put_failure;
3116
3117 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3118 goto nla_put_failure;
3119 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3120 goto nla_put_failure;
3121 if (set->flags & NFT_SET_MAP) {
3122 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3123 goto nla_put_failure;
3124 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3125 goto nla_put_failure;
3126 }
8aeff920
PNA		 3127 if (set->flags & NFT_SET_OBJECT &&
3128 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3129 goto nla_put_failure;
20a69341 3130
761da293 3131 if (set->timeout &&
d3e2a111 3132 nla_put_be64(skb, NFTA_SET_TIMEOUT,
8e1102d5 3133 nf_jiffies64_to_msecs(set->timeout),
b46f6ded 3134 NFTA_SET_PAD))
761da293
PM		 3135 goto nla_put_failure;
3136 if (set->gc_int &&
3137 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3138 goto nla_put_failure;
3139
9363dc4b
AB		 3140 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3141 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3142 goto nla_put_failure;
3143 }
3144
e6d8ecac
CFG		 3145 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3146 goto nla_put_failure;
3147
c50b960c
PM		 3148 desc = nla_nest_start(skb, NFTA_SET_DESC);
3149 if (desc == NULL)
3150 goto nla_put_failure;
3151 if (set->size &&
3152 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3153 goto nla_put_failure;
3154 nla_nest_end(skb, desc);
3155
053c095a
JB		 3156 nlmsg_end(skb, nlh);
3157 return 0;
20a69341
PM		 3158
3159nla_put_failure:
3160 nlmsg_trim(skb, nlh);
3161 return -1;
3162}
3163
25e94a99
PNA		 3164static void nf_tables_set_notify(const struct nft_ctx *ctx,
3165 const struct nft_set *set, int event,
3166 gfp_t gfp_flags)
20a69341
PM		 3167{
3168 struct sk_buff *skb;
128ad332 3169 u32 portid = ctx->portid;
20a69341
PM		 3170 int err;
3171
128ad332
PNA		 3172 if (!ctx->report &&
3173 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 3174 return;
20a69341 3175
31f8441c 3176 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
20a69341
PM		 3177 if (skb == NULL)
3178 goto err;
3179
3180 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3181 if (err < 0) {
3182 kfree_skb(skb);
3183 goto err;
3184 }
3185
25e94a99
PNA		 3186 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
3187 gfp_flags);
3188 return;
20a69341 3189err:
25e94a99 3190 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
20a69341
PM		 3191}
3192
5b96af77 3193static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
c9c8e485
PNA		 3194{
3195 const struct nft_set *set;
3196 unsigned int idx, s_idx = cb->args[0];
c9c8e485
PNA		 3197 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3198 struct net *net = sock_net(skb->sk);
5b96af77 3199 struct nft_ctx *ctx = cb->data, ctx_set;
c9c8e485
PNA		 3200
3201 if (cb->args[1])
3202 return skb->len;
3203
e688a7f8 3204 rcu_read_lock();
38e029f1
PNA		 3205 cb->seq = net->nft.base_seq;
3206
36596dad
PNA		 3207 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3208 if (ctx->family != NFPROTO_UNSPEC &&
98319cb9 3209 ctx->family != table->family)
36596dad
PNA		 3210 continue;
3211
3212 if (ctx->table && ctx->table != table)
5b96af77
PNA		 3213 continue;
3214
36596dad
PNA		 3215 if (cur_table) {
3216 if (cur_table != table)
c9c8e485
PNA		 3217 continue;
3218
36596dad 3219 cur_table = NULL;
c9c8e485 3220 }
36596dad
PNA		 3221 idx = 0;
3222 list_for_each_entry_rcu(set, &table->sets, list) {
3223 if (idx < s_idx)
3224 goto cont;
3225 if (!nft_is_active(net, set))
3226 goto cont;
5b96af77 3227
36596dad
PNA		 3228 ctx_set = *ctx;
3229 ctx_set.table = table;
98319cb9 3230 ctx_set.family = table->family;
c9c8e485 3231
36596dad
PNA		 3232 if (nf_tables_fill_set(skb, &ctx_set, set,
3233 NFT_MSG_NEWSET,
3234 NLM_F_MULTI) < 0) {
3235 cb->args[0] = idx;
3236 cb->args[2] = (unsigned long) table;
3237 goto done;
c9c8e485 3238 }
36596dad 3239 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
c9c8e485 3240cont:
36596dad 3241 idx++;
c9c8e485 3242 }
36596dad
PNA		 3243 if (s_idx)
3244 s_idx = 0;
c9c8e485
PNA		 3245 }
3246 cb->args[1] = 1;
3247done:
e688a7f8 3248 rcu_read_unlock();
c9c8e485
PNA		 3249 return skb->len;
3250}
3251
90fd131a
FW		 3252static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3253{
3254 struct nft_ctx *ctx_dump = NULL;
3255
3256 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3257 if (ctx_dump == NULL)
3258 return -ENOMEM;
3259
3260 cb->data = ctx_dump;
3261 return 0;
3262}
3263
5b96af77 3264static int nf_tables_dump_sets_done(struct netlink_callback *cb)
20a69341 3265{
5b96af77
PNA		 3266 kfree(cb->data);
3267 return 0;
20a69341
PM		 3268}
3269
d9adf22a 3270/* called with rcu_read_lock held */
7b8002a1
PNA		 3271static int nf_tables_getset(struct net *net, struct sock *nlsk,
3272 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3273 const struct nlattr * const nla[],
3274 struct netlink_ext_ack *extack)
20a69341 3275{
f2a6d766 3276 u8 genmask = nft_genmask_cur(net);
20a69341
PM		 3277 const struct nft_set *set;
3278 struct nft_ctx ctx;
3279 struct sk_buff *skb2;
c9c8e485 3280 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 3281 int err;
3282
01cfa0a4 3283 /* Verify existence before starting dump */
36dd1bcc
PNA		 3284 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3285 genmask);
20a69341
PM		 3286 if (err < 0)
3287 return err;
3288
3289 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3290 struct netlink_dump_control c = {
90fd131a 3291 .start = nf_tables_dump_sets_start,
20a69341 3292 .dump = nf_tables_dump_sets,
5b96af77 3293 .done = nf_tables_dump_sets_done,
90fd131a 3294 .data = &ctx,
d9adf22a 3295 .module = THIS_MODULE,
20a69341 3296 };
5b96af77 3297
d9adf22a 3298 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
20a69341
PM		 3299 }
3300
c9c8e485
PNA		 3301 /* Only accept unspec with dump */
3302 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3303 return -EAFNOSUPPORT;
eaa2bcd6
PT		 3304 if (!nla[NFTA_SET_TABLE])
3305 return -EINVAL;
c9c8e485 3306
cac20fcd 3307 set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 3308 if (IS_ERR(set))
3309 return PTR_ERR(set);
3310
d9adf22a 3311 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
20a69341
PM		 3312 if (skb2 == NULL)
3313 return -ENOMEM;
3314
3315 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3316 if (err < 0)
3317 goto err;
3318
3319 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3320
3321err:
3322 kfree_skb(skb2);
3323 return err;
3324}
3325
c50b960c
PM		 3326static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
3327 struct nft_set_desc *desc,
3328 const struct nlattr *nla)
3329{
3330 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
3331 int err;
3332
fceb6435
JB		 3333 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
3334 nft_set_desc_policy, NULL);
c50b960c
PM		 3335 if (err < 0)
3336 return err;
3337
3338 if (da[NFTA_SET_DESC_SIZE] != NULL)
3339 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
3340
3341 return 0;
3342}
3343
633c9a84
PNA		 3344static int nf_tables_newset(struct net *net, struct sock *nlsk,
3345 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3346 const struct nlattr * const nla[],
3347 struct netlink_ext_ack *extack)
20a69341
PM		 3348{
3349 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 3350 u8 genmask = nft_genmask_next(net);
98319cb9 3351 int family = nfmsg->nfgen_family;
20a69341 3352 const struct nft_set_ops *ops;
20a69341
PM		 3353 struct nft_table *table;
3354 struct nft_set *set;
3355 struct nft_ctx ctx;
38745490 3356 char *name;
4ef360dd 3357 u64 size;
761da293 3358 u64 timeout;
8aeff920 3359 u32 ktype, dtype, flags, policy, gc_int, objtype;
c50b960c 3360 struct nft_set_desc desc;
e6d8ecac
CFG		 3361 unsigned char *udata;
3362 u16 udlen;
20a69341
PM		 3363 int err;
3364
3365 if (nla[NFTA_SET_TABLE] == NULL ||
3366 nla[NFTA_SET_NAME] == NULL ||
958bee14
PNA		 3367 nla[NFTA_SET_KEY_LEN] == NULL ||
3368 nla[NFTA_SET_ID] == NULL)
20a69341
PM		 3369 return -EINVAL;
3370
c50b960c
PM		 3371 memset(&desc, 0, sizeof(desc));
3372
20a69341
PM		 3373 ktype = NFT_DATA_VALUE;
3374 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3375 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3376 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3377 return -EINVAL;
3378 }
3379
c50b960c 3380 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
7d740264 3381 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 3382 return -EINVAL;
3383
3384 flags = 0;
3385 if (nla[NFTA_SET_FLAGS] != NULL) {
3386 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3387 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
7c6c6e95 3388 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
8aeff920
PNA		 3389 NFT_SET_MAP | NFT_SET_EVAL |
3390 NFT_SET_OBJECT))
20a69341 3391 return -EINVAL;
8aeff920
PNA		 3392 /* Only one of these operations is supported */
3393 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3394 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
7c6c6e95 3395 return -EOPNOTSUPP;
20a69341
PM		 3396 }
3397
3398 dtype = 0;
20a69341
PM		 3399 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3400 if (!(flags & NFT_SET_MAP))
3401 return -EINVAL;
3402
3403 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3404 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3405 dtype != NFT_DATA_VERDICT)
3406 return -EINVAL;
3407
3408 if (dtype != NFT_DATA_VERDICT) {
3409 if (nla[NFTA_SET_DATA_LEN] == NULL)
3410 return -EINVAL;
c50b960c 3411 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
7d740264 3412 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 3413 return -EINVAL;
3414 } else
7d740264 3415 desc.dlen = sizeof(struct nft_verdict);
20a69341
PM		 3416 } else if (flags & NFT_SET_MAP)
3417 return -EINVAL;
3418
8aeff920
PNA		 3419 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3420 if (!(flags & NFT_SET_OBJECT))
3421 return -EINVAL;
3422
3423 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3424 if (objtype == NFT_OBJECT_UNSPEC ||
3425 objtype > NFT_OBJECT_MAX)
3426 return -EINVAL;
3427 } else if (flags & NFT_SET_OBJECT)
3428 return -EINVAL;
3429 else
3430 objtype = NFT_OBJECT_UNSPEC;
3431
761da293
PM		 3432 timeout = 0;
3433 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3434 if (!(flags & NFT_SET_TIMEOUT))
3435 return -EINVAL;
8e1102d5
FW		 3436
3437 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
3438 if (err)
3439 return err;
761da293
PM		 3440 }
3441 gc_int = 0;
3442 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3443 if (!(flags & NFT_SET_TIMEOUT))
3444 return -EINVAL;
3445 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3446 }
3447
c50b960c
PM		 3448 policy = NFT_SET_POL_PERFORMANCE;
3449 if (nla[NFTA_SET_POLICY] != NULL)
3450 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3451
3452 if (nla[NFTA_SET_DESC] != NULL) {
3453 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
3454 if (err < 0)
3455 return err;
3456 }
3457
cac20fcd 3458 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
36dd1bcc
PNA		 3459 if (IS_ERR(table)) {
3460 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
20a69341 3461 return PTR_ERR(table);
36dd1bcc 3462 }
20a69341 3463
98319cb9 3464 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
20a69341 3465
cac20fcd 3466 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
20a69341 3467 if (IS_ERR(set)) {
36dd1bcc
PNA		 3468 if (PTR_ERR(set) != -ENOENT) {
3469 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
20a69341 3470 return PTR_ERR(set);
36dd1bcc 3471 }
1a28ad74 3472 } else {
36dd1bcc
PNA		 3473 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3474 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
20a69341 3475 return -EEXIST;
36dd1bcc 3476 }
20a69341
PM		 3477 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3478 return -EOPNOTSUPP;
36dd1bcc 3479
20a69341
PM		 3480 return 0;
3481 }
3482
3483 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3484 return -ENOENT;
3485
2b664957 3486 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
20a69341
PM		 3487 if (IS_ERR(ops))
3488 return PTR_ERR(ops);
3489
e6d8ecac
CFG		 3490 udlen = 0;
3491 if (nla[NFTA_SET_USERDATA])
3492 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3493
20a69341
PM		 3494 size = 0;
3495 if (ops->privsize != NULL)
347b408d 3496 size = ops->privsize(nla, &desc);
20a69341 3497
1ff75a3e
PNA		 3498 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3499 if (!set) {
3500 err = -ENOMEM;
20a69341 3501 goto err1;
1ff75a3e 3502 }
20a69341 3503
38745490
PS		 3504 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3505 if (!name) {
3506 err = -ENOMEM;
3507 goto err2;
3508 }
3509
20a69341 3510 err = nf_tables_set_alloc_name(&ctx, set, name);
38745490 3511 kfree(name);
20a69341
PM		 3512 if (err < 0)
3513 goto err2;
3514
e6d8ecac
CFG		 3515 udata = NULL;
3516 if (udlen) {
3517 udata = set->data + size;
3518 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3519 }
3520
20a69341 3521 INIT_LIST_HEAD(&set->bindings);
3453c927
PNA		 3522 set->table = table;
3523 write_pnet(&set->net, net);
20a69341
PM		 3524 set->ops = ops;
3525 set->ktype = ktype;
c50b960c 3526 set->klen = desc.klen;
20a69341 3527 set->dtype = dtype;
8aeff920 3528 set->objtype = objtype;
c50b960c 3529 set->dlen = desc.dlen;
20a69341 3530 set->flags = flags;
c50b960c 3531 set->size = desc.size;
9363dc4b 3532 set->policy = policy;
e6d8ecac
CFG		 3533 set->udlen = udlen;
3534 set->udata = udata;
761da293
PM		 3535 set->timeout = timeout;
3536 set->gc_int = gc_int;
3ecbfd65 3537 set->handle = nf_tables_alloc_handle(table);
20a69341 3538
c50b960c 3539 err = ops->init(set, &desc, nla);
20a69341 3540 if (err < 0)
2f6adf48 3541 goto err3;
20a69341 3542
958bee14 3543 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
20a69341 3544 if (err < 0)
2f6adf48 3545 goto err4;
20a69341 3546
e688a7f8 3547 list_add_tail_rcu(&set->list, &table->sets);
4fefee57 3548 table->use++;
20a69341
PM		 3549 return 0;
3550
2f6adf48 3551err4:
c17c3cdf 3552 ops->destroy(set);
2f6adf48
FW		 3553err3:
3554 kfree(set->name);
20a69341 3555err2:
1ff75a3e 3556 kvfree(set);
20a69341 3557err1:
71cc0873 3558 module_put(to_set_type(ops)->owner);
20a69341
PM		 3559 return err;
3560}
3561
958bee14 3562static void nft_set_destroy(struct nft_set *set)
20a69341 3563{
20a69341 3564 set->ops->destroy(set);
71cc0873 3565 module_put(to_set_type(set->ops)->owner);
38745490 3566 kfree(set->name);
1ff75a3e 3567 kvfree(set);
20a69341
PM		 3568}
3569
958bee14
PNA		 3570static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3571{
e688a7f8 3572 list_del_rcu(&set->list);
31f8441c 3573 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
958bee14
PNA		 3574 nft_set_destroy(set);
3575}
3576
633c9a84
PNA		 3577static int nf_tables_delset(struct net *net, struct sock *nlsk,
3578 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3579 const struct nlattr * const nla[],
3580 struct netlink_ext_ack *extack)
20a69341 3581{
c9c8e485 3582 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 3583 u8 genmask = nft_genmask_next(net);
36dd1bcc 3584 const struct nlattr *attr;
20a69341
PM		 3585 struct nft_set *set;
3586 struct nft_ctx ctx;
3587 int err;
3588
ec2c9935
PM		 3589 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3590 return -EAFNOSUPPORT;
20a69341
PM		 3591 if (nla[NFTA_SET_TABLE] == NULL)
3592 return -EINVAL;
3593
36dd1bcc
PNA		 3594 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3595 genmask);
20a69341
PM		 3596 if (err < 0)
3597 return err;
3598
36dd1bcc
PNA		 3599 if (nla[NFTA_SET_HANDLE]) {
3600 attr = nla[NFTA_SET_HANDLE];
3601 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
3602 } else {
3603 attr = nla[NFTA_SET_NAME];
3604 set = nft_set_lookup(ctx.table, attr, genmask);
3605 }
a8278400 3606
36dd1bcc
PNA		 3607 if (IS_ERR(set)) {
3608 NL_SET_BAD_ATTR(extack, attr);
3609 return PTR_ERR(set);
3610 }
a8278400 3611 if (!list_empty(&set->bindings) ||
36dd1bcc
PNA		 3612 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
3613 NL_SET_BAD_ATTR(extack, attr);
20a69341 3614 return -EBUSY;
36dd1bcc 3615 }
20a69341 3616
ee01d542 3617 return nft_delset(&ctx, set);
20a69341
PM		 3618}
3619
3620static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
de70185d 3621 struct nft_set *set,
20a69341 3622 const struct nft_set_iter *iter,
de70185d 3623 struct nft_set_elem *elem)
20a69341 3624{
fe2811eb 3625 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 3626 enum nft_registers dreg;
3627
3628 dreg = nft_type_to_reg(set->dtype);
1ec10212
PM		 3629 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3630 set->dtype == NFT_DATA_VERDICT ?
3631 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3632 set->dlen);
20a69341
PM		 3633}
3634
3635int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3636 struct nft_set_binding *binding)
3637{
3638 struct nft_set_binding *i;
3639 struct nft_set_iter iter;
3640
408070d6 3641 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
20a69341
PM		 3642 return -EBUSY;
3643
11113e19 3644 if (binding->flags & NFT_SET_MAP) {
20a69341
PM		 3645 /* If the set is already bound to the same chain all
3646 * jumps are already validated for that chain.
3647 */
3648 list_for_each_entry(i, &set->bindings, list) {
a4684402 3649 if (i->flags & NFT_SET_MAP &&
11113e19 3650 i->chain == binding->chain)
20a69341
PM		 3651 goto bind;
3652 }
3653
8588ac09 3654 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 3655 iter.skip = 0;
3656 iter.count = 0;
3657 iter.err = 0;
3658 iter.fn = nf_tables_bind_check_setelem;
3659
3660 set->ops->walk(ctx, set, &iter);
a02f4248 3661 if (iter.err < 0)
20a69341 3662 return iter.err;
20a69341
PM		 3663 }
3664bind:
3665 binding->chain = ctx->chain;
e688a7f8 3666 list_add_tail_rcu(&binding->list, &set->bindings);
20a69341
PM		 3667 return 0;
3668}
63aea290 3669EXPORT_SYMBOL_GPL(nf_tables_bind_set);
20a69341
PM		 3670
3671void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3672 struct nft_set_binding *binding)
3673{
e688a7f8 3674 list_del_rcu(&binding->list);
20a69341 3675
408070d6 3676 if (list_empty(&set->bindings) && nft_set_is_anonymous(set) &&
37a9cc52 3677 nft_is_active(ctx->net, set))
20a69341
PM		 3678 nf_tables_set_destroy(ctx, set);
3679}
63aea290 3680EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
20a69341 3681
3ac4c07a
PM		 3682const struct nft_set_ext_type nft_set_ext_types[] = {
3683 [NFT_SET_EXT_KEY] = {
7d740264 3684 .align = __alignof__(u32),
3ac4c07a
PM		 3685 },
3686 [NFT_SET_EXT_DATA] = {
7d740264 3687 .align = __alignof__(u32),
3ac4c07a 3688 },
f25ad2e9
PM		 3689 [NFT_SET_EXT_EXPR] = {
3690 .align = __alignof__(struct nft_expr),
3691 },
8aeff920
PNA		 3692 [NFT_SET_EXT_OBJREF] = {
3693 .len = sizeof(struct nft_object *),
3694 .align = __alignof__(struct nft_object *),
3695 },
3ac4c07a
PM		 3696 [NFT_SET_EXT_FLAGS] = {
3697 .len = sizeof(u8),
3698 .align = __alignof__(u8),
3699 },
c3e1b005
PM		 3700 [NFT_SET_EXT_TIMEOUT] = {
3701 .len = sizeof(u64),
3702 .align = __alignof__(u64),
3703 },
3704 [NFT_SET_EXT_EXPIRATION] = {
8e1102d5
FW		 3705 .len = sizeof(u64),
3706 .align = __alignof__(u64),
c3e1b005 3707 },
68e942e8
PM		 3708 [NFT_SET_EXT_USERDATA] = {
3709 .len = sizeof(struct nft_userdata),
3710 .align = __alignof__(struct nft_userdata),
3711 },
3ac4c07a
PM		 3712};
3713EXPORT_SYMBOL_GPL(nft_set_ext_types);
3714
20a69341
PM		 3715/*
3716 * Set elements
3717 */
3718
3719static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3720 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3721 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3722 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
c3e1b005 3723 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
68e942e8
PM		 3724 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3725 .len = NFT_USERDATA_MAXLEN },
467697d2
FW		 3726 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
3727 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING },
20a69341
PM		 3728};
3729
3730static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
b2fbd044
LZ		 3731 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3732 .len = NFT_TABLE_MAXNAMELEN - 1 },
3733 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3734 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341 3735 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
958bee14 3736 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
20a69341
PM		 3737};
3738
633c9a84 3739static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 3740 const struct sk_buff *skb,
3741 const struct nlmsghdr *nlh,
f2a6d766 3742 const struct nlattr * const nla[],
36dd1bcc 3743 struct netlink_ext_ack *extack,
f2a6d766 3744 u8 genmask)
20a69341
PM		 3745{
3746 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
98319cb9 3747 int family = nfmsg->nfgen_family;
7c95f6d8 3748 struct nft_table *table;
20a69341 3749
cac20fcd
PNA		 3750 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
3751 genmask);
36dd1bcc
PNA		 3752 if (IS_ERR(table)) {
3753 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
20a69341 3754 return PTR_ERR(table);
36dd1bcc 3755 }
20a69341 3756
98319cb9 3757 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
20a69341
PM		 3758 return 0;
3759}
3760
3761static int nf_tables_fill_setelem(struct sk_buff *skb,
3762 const struct nft_set *set,
3763 const struct nft_set_elem *elem)
3764{
fe2811eb 3765 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 3766 unsigned char *b = skb_tail_pointer(skb);
3767 struct nlattr *nest;
3768
3769 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3770 if (nest == NULL)
3771 goto nla_put_failure;
3772
fe2811eb
PM		 3773 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3774 NFT_DATA_VALUE, set->klen) < 0)
20a69341
PM		 3775 goto nla_put_failure;
3776
fe2811eb
PM		 3777 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3778 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
20a69341
PM		 3779 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3780 set->dlen) < 0)
3781 goto nla_put_failure;
3782
f25ad2e9
PM		 3783 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3784 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3785 goto nla_put_failure;
3786
8aeff920
PNA		 3787 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3788 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3789 (*nft_set_ext_obj(ext))->name) < 0)
3790 goto nla_put_failure;
3791
fe2811eb
PM		 3792 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3793 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3794 htonl(*nft_set_ext_flags(ext))))
3795 goto nla_put_failure;
20a69341 3796
c3e1b005
PM		 3797 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3798 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
8e1102d5 3799 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
b46f6ded 3800 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3801 goto nla_put_failure;
3802
3803 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
8e1102d5 3804 u64 expires, now = get_jiffies_64();
c3e1b005
PM		 3805
3806 expires = *nft_set_ext_expiration(ext);
8e1102d5 3807 if (time_before64(now, expires))
c3e1b005
PM		 3808 expires -= now;
3809 else
3810 expires = 0;
3811
3812 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
8e1102d5 3813 nf_jiffies64_to_msecs(expires),
b46f6ded 3814 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3815 goto nla_put_failure;
3816 }
3817
68e942e8
PM		 3818 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3819 struct nft_userdata *udata;
3820
3821 udata = nft_set_ext_userdata(ext);
3822 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3823 udata->len + 1, udata->data))
3824 goto nla_put_failure;
3825 }
3826
20a69341
PM		 3827 nla_nest_end(skb, nest);
3828 return 0;
3829
3830nla_put_failure:
3831 nlmsg_trim(skb, b);
3832 return -EMSGSIZE;
3833}
3834
3835struct nft_set_dump_args {
3836 const struct netlink_callback *cb;
3837 struct nft_set_iter iter;
3838 struct sk_buff *skb;
3839};
3840
3841static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
de70185d 3842 struct nft_set *set,
20a69341 3843 const struct nft_set_iter *iter,
de70185d 3844 struct nft_set_elem *elem)
20a69341
PM		 3845{
3846 struct nft_set_dump_args *args;
3847
3848 args = container_of(iter, struct nft_set_dump_args, iter);
3849 return nf_tables_fill_setelem(args->skb, set, elem);
3850}
3851
fa803605
LZ		 3852struct nft_set_dump_ctx {
3853 const struct nft_set *set;
3854 struct nft_ctx ctx;
3855};
3856
20a69341
PM		 3857static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3858{
fa803605 3859 struct nft_set_dump_ctx *dump_ctx = cb->data;
633c9a84 3860 struct net *net = sock_net(skb->sk);
fa803605 3861 struct nft_table *table;
de70185d 3862 struct nft_set *set;
20a69341 3863 struct nft_set_dump_args args;
fa803605 3864 bool set_found = false;
20a69341
PM		 3865 struct nfgenmsg *nfmsg;
3866 struct nlmsghdr *nlh;
3867 struct nlattr *nest;
3868 u32 portid, seq;
fa803605 3869 int event;
20a69341 3870
fa803605 3871 rcu_read_lock();
36596dad
PNA		 3872 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3873 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
98319cb9 3874 dump_ctx->ctx.family != table->family)
fa803605 3875 continue;
20a69341 3876
36596dad
PNA		 3877 if (table != dump_ctx->ctx.table)
3878 continue;
20a69341 3879
36596dad
PNA		 3880 list_for_each_entry_rcu(set, &table->sets, list) {
3881 if (set == dump_ctx->set) {
3882 set_found = true;
3883 break;
fa803605 3884 }
fa803605
LZ		 3885 }
3886 break;
3887 }
3888
3889 if (!set_found) {
3890 rcu_read_unlock();
3891 return -ENOENT;
3892 }
20a69341 3893
dedb67c4 3894 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
20a69341
PM		 3895 portid = NETLINK_CB(cb->skb).portid;
3896 seq = cb->nlh->nlmsg_seq;
3897
3898 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3899 NLM_F_MULTI);
3900 if (nlh == NULL)
3901 goto nla_put_failure;
3902
3903 nfmsg = nlmsg_data(nlh);
98319cb9 3904 nfmsg->nfgen_family = table->family;
20a69341 3905 nfmsg->version = NFNETLINK_V0;
fa803605 3906 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
20a69341 3907
fa803605 3908 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
20a69341
PM		 3909 goto nla_put_failure;
3910 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3911 goto nla_put_failure;
3912
3913 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3914 if (nest == NULL)
3915 goto nla_put_failure;
3916
8588ac09
PNA		 3917 args.cb = cb;
3918 args.skb = skb;
fa803605 3919 args.iter.genmask = nft_genmask_cur(net);
8588ac09
PNA		 3920 args.iter.skip = cb->args[0];
3921 args.iter.count = 0;
3922 args.iter.err = 0;
3923 args.iter.fn = nf_tables_dump_setelem;
fa803605
LZ		 3924 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
3925 rcu_read_unlock();
20a69341
PM		 3926
3927 nla_nest_end(skb, nest);
3928 nlmsg_end(skb, nlh);
3929
3930 if (args.iter.err && args.iter.err != -EMSGSIZE)
3931 return args.iter.err;
3932 if (args.iter.count == cb->args[0])
3933 return 0;
3934
3935 cb->args[0] = args.iter.count;
3936 return skb->len;
3937
3938nla_put_failure:
fa803605 3939 rcu_read_unlock();
20a69341
PM		 3940 return -ENOSPC;
3941}
3942
90fd131a
FW		 3943static int nf_tables_dump_set_start(struct netlink_callback *cb)
3944{
3945 struct nft_set_dump_ctx *dump_ctx = cb->data;
3946
3947 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
3948
3949 return cb->data ? 0 : -ENOMEM;
3950}
3951
fa803605
LZ		 3952static int nf_tables_dump_set_done(struct netlink_callback *cb)
3953{
3954 kfree(cb->data);
3955 return 0;
3956}
3957
d60ce62f
AB		 3958static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3959 const struct nft_ctx *ctx, u32 seq,
3960 u32 portid, int event, u16 flags,
3961 const struct nft_set *set,
3962 const struct nft_set_elem *elem)
3963{
3964 struct nfgenmsg *nfmsg;
3965 struct nlmsghdr *nlh;
3966 struct nlattr *nest;
3967 int err;
3968
dedb67c4 3969 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
d60ce62f
AB		 3970 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3971 flags);
3972 if (nlh == NULL)
3973 goto nla_put_failure;
3974
3975 nfmsg = nlmsg_data(nlh);
36596dad 3976 nfmsg->nfgen_family = ctx->family;
d60ce62f 3977 nfmsg->version = NFNETLINK_V0;
84d7fce6 3978 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
d60ce62f
AB		 3979
3980 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3981 goto nla_put_failure;
3982 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3983 goto nla_put_failure;
3984
3985 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3986 if (nest == NULL)
3987 goto nla_put_failure;
3988
3989 err = nf_tables_fill_setelem(skb, set, elem);
3990 if (err < 0)
3991 goto nla_put_failure;
3992
3993 nla_nest_end(skb, nest);
3994
053c095a
JB		 3995 nlmsg_end(skb, nlh);
3996 return 0;
d60ce62f
AB		 3997
3998nla_put_failure:
3999 nlmsg_trim(skb, nlh);
4000 return -1;
4001}
4002
ba0e4d99
PNA		 4003static int nft_setelem_parse_flags(const struct nft_set *set,
4004 const struct nlattr *attr, u32 *flags)
4005{
4006 if (attr == NULL)
4007 return 0;
4008
4009 *flags = ntohl(nla_get_be32(attr));
4010 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4011 return -EINVAL;
4012 if (!(set->flags & NFT_SET_INTERVAL) &&
4013 *flags & NFT_SET_ELEM_INTERVAL_END)
4014 return -EINVAL;
4015
4016 return 0;
4017}
4018
4019static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4020 const struct nlattr *attr)
4021{
4022 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
ba0e4d99
PNA		 4023 struct nft_data_desc desc;
4024 struct nft_set_elem elem;
4025 struct sk_buff *skb;
4026 uint32_t flags = 0;
4027 void *priv;
4028 int err;
4029
4030 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4031 nft_set_elem_policy, NULL);
4032 if (err < 0)
4033 return err;
4034
4035 if (!nla[NFTA_SET_ELEM_KEY])
4036 return -EINVAL;
4037
4038 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4039 if (err < 0)
4040 return err;
4041
4042 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4043 nla[NFTA_SET_ELEM_KEY]);
4044 if (err < 0)
4045 return err;
4046
4047 err = -EINVAL;
4048 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4049 return err;
4050
4051 priv = set->ops->get(ctx->net, set, &elem, flags);
4052 if (IS_ERR(priv))
4053 return PTR_ERR(priv);
4054
4055 elem.priv = priv;
ba0e4d99
PNA		 4056
4057 err = -ENOMEM;
d9adf22a 4058 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
ba0e4d99
PNA		 4059 if (skb == NULL)
4060 goto err1;
4061
4062 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4063 NFT_MSG_NEWSETELEM, 0, set, &elem);
4064 if (err < 0)
4065 goto err2;
4066
4067 err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT);
4068 /* This avoids a loop in nfnetlink. */
4069 if (err < 0)
4070 goto err1;
4071
4072 return 0;
4073err2:
4074 kfree_skb(skb);
4075err1:
4076 /* this avoids a loop in nfnetlink. */
4077 return err == -EAGAIN ? -ENOBUFS : err;
4078}
4079
d9adf22a 4080/* called with rcu_read_lock held */
ba0e4d99
PNA		 4081static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4082 struct sk_buff *skb, const struct nlmsghdr *nlh,
4083 const struct nlattr * const nla[],
4084 struct netlink_ext_ack *extack)
4085{
4086 u8 genmask = nft_genmask_cur(net);
4087 struct nft_set *set;
4088 struct nlattr *attr;
4089 struct nft_ctx ctx;
4090 int rem, err = 0;
4091
36dd1bcc
PNA		 4092 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4093 genmask);
ba0e4d99
PNA		 4094 if (err < 0)
4095 return err;
4096
cac20fcd 4097 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
ba0e4d99
PNA		 4098 if (IS_ERR(set))
4099 return PTR_ERR(set);
4100
4101 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4102 struct netlink_dump_control c = {
90fd131a 4103 .start = nf_tables_dump_set_start,
ba0e4d99
PNA		 4104 .dump = nf_tables_dump_set,
4105 .done = nf_tables_dump_set_done,
d9adf22a 4106 .module = THIS_MODULE,
ba0e4d99 4107 };
90fd131a
FW		 4108 struct nft_set_dump_ctx dump_ctx = {
4109 .set = set,
4110 .ctx = ctx,
4111 };
ba0e4d99 4112
90fd131a 4113 c.data = &dump_ctx;
d9adf22a 4114 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
ba0e4d99
PNA		 4115 }
4116
4117 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4118 return -EINVAL;
4119
4120 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4121 err = nft_get_set_elem(&ctx, set, attr);
4122 if (err < 0)
4123 break;
4124 }
4125
4126 return err;
4127}
4128
25e94a99
PNA		 4129static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4130 const struct nft_set *set,
4131 const struct nft_set_elem *elem,
4132 int event, u16 flags)
d60ce62f 4133{
128ad332
PNA		 4134 struct net *net = ctx->net;
4135 u32 portid = ctx->portid;
d60ce62f
AB		 4136 struct sk_buff *skb;
4137 int err;
4138
128ad332 4139 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 4140 return;
d60ce62f 4141
d60ce62f
AB		 4142 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4143 if (skb == NULL)
4144 goto err;
4145
4146 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
4147 set, elem);
4148 if (err < 0) {
4149 kfree_skb(skb);
4150 goto err;
4151 }
4152
25e94a99
PNA		 4153 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
4154 GFP_KERNEL);
4155 return;
d60ce62f 4156err:
25e94a99 4157 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
d60ce62f
AB		 4158}
4159
60319eb1
PNA		 4160static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
4161 int msg_type,
4162 struct nft_set *set)
4163{
4164 struct nft_trans *trans;
4165
4166 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
4167 if (trans == NULL)
4168 return NULL;
4169
4170 nft_trans_elem_set(trans) = set;
4171 return trans;
4172}
4173
22fe54d5
PM		 4174void *nft_set_elem_init(const struct nft_set *set,
4175 const struct nft_set_ext_tmpl *tmpl,
49499c3e 4176 const u32 *key, const u32 *data,
22fe54d5 4177 u64 timeout, gfp_t gfp)
fe2811eb
PM		 4178{
4179 struct nft_set_ext *ext;
4180 void *elem;
4181
4182 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
4183 if (elem == NULL)
4184 return NULL;
4185
4186 ext = nft_set_elem_ext(set, elem);
4187 nft_set_ext_init(ext, tmpl);
4188
4189 memcpy(nft_set_ext_key(ext), key, set->klen);
4190 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4191 memcpy(nft_set_ext_data(ext), data, set->dlen);
c3e1b005
PM		 4192 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
4193 *nft_set_ext_expiration(ext) =
8e1102d5 4194 get_jiffies_64() + timeout;
c3e1b005
PM		 4195 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
4196 *nft_set_ext_timeout(ext) = timeout;
fe2811eb
PM		 4197
4198 return elem;
4199}
4200
61f9e292
LZ		 4201void nft_set_elem_destroy(const struct nft_set *set, void *elem,
4202 bool destroy_expr)
61edafbb
PM		 4203{
4204 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3453c927
PNA		 4205 struct nft_ctx ctx = {
4206 .net = read_pnet(&set->net),
4207 .family = set->table->family,
4208 };
61edafbb 4209
59105446 4210 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
61edafbb 4211 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
59105446 4212 nft_data_release(nft_set_ext_data(ext), set->dtype);
371ebcbb
PNA		 4213 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) {
4214 struct nft_expr *expr = nft_set_ext_expr(ext);
4215
4216 if (expr->ops->destroy_clone) {
4217 expr->ops->destroy_clone(&ctx, expr);
4218 module_put(expr->ops->type->owner);
4219 } else {
4220 nf_tables_expr_destroy(&ctx, expr);
4221 }
4222 }
8aeff920
PNA		 4223 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4224 (*nft_set_ext_obj(ext))->use--;
61edafbb
PM		 4225 kfree(elem);
4226}
4227EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
4228
59105446
PNA		 4229/* Only called from commit path, nft_set_elem_deactivate() already deals with
4230 * the refcounting from the preparation phase.
4231 */
3453c927
PNA		 4232static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
4233 const struct nft_set *set, void *elem)
59105446
PNA		 4234{
4235 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4236
4237 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3453c927 4238 nf_tables_expr_destroy(ctx, nft_set_ext_expr(ext));
59105446
PNA		 4239 kfree(elem);
4240}
4241
60319eb1 4242static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
c016c7e4 4243 const struct nlattr *attr, u32 nlmsg_flags)
20a69341
PM		 4244{
4245 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
8aeff920 4246 u8 genmask = nft_genmask_next(ctx->net);
20a69341 4247 struct nft_data_desc d1, d2;
fe2811eb 4248 struct nft_set_ext_tmpl tmpl;
c016c7e4 4249 struct nft_set_ext *ext, *ext2;
20a69341
PM		 4250 struct nft_set_elem elem;
4251 struct nft_set_binding *binding;
8aeff920 4252 struct nft_object *obj = NULL;
68e942e8 4253 struct nft_userdata *udata;
fe2811eb 4254 struct nft_data data;
20a69341 4255 enum nft_registers dreg;
60319eb1 4256 struct nft_trans *trans;
0e9091d6 4257 u32 flags = 0;
c3e1b005 4258 u64 timeout;
68e942e8 4259 u8 ulen;
20a69341
PM		 4260 int err;
4261
4262 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
fceb6435 4263 nft_set_elem_policy, NULL);
20a69341
PM		 4264 if (err < 0)
4265 return err;
4266
4267 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4268 return -EINVAL;
4269
fe2811eb
PM		 4270 nft_set_ext_prepare(&tmpl);
4271
0e9091d6
PNA		 4272 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4273 if (err < 0)
4274 return err;
4275 if (flags != 0)
4276 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
20a69341
PM		 4277
4278 if (set->flags & NFT_SET_MAP) {
4279 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
fe2811eb 4280 !(flags & NFT_SET_ELEM_INTERVAL_END))
20a69341 4281 return -EINVAL;
bd7fc645 4282 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
fe2811eb 4283 flags & NFT_SET_ELEM_INTERVAL_END)
bd7fc645 4284 return -EINVAL;
20a69341
PM		 4285 } else {
4286 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4287 return -EINVAL;
4288 }
4289
c3e1b005
PM		 4290 timeout = 0;
4291 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
4292 if (!(set->flags & NFT_SET_TIMEOUT))
4293 return -EINVAL;
8e1102d5
FW		 4294 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
4295 &timeout);
4296 if (err)
4297 return err;
c3e1b005
PM		 4298 } else if (set->flags & NFT_SET_TIMEOUT) {
4299 timeout = set->timeout;
4300 }
4301
7d740264 4302 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
d0a11fc3 4303 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 4304 if (err < 0)
4305 goto err1;
4306 err = -EINVAL;
4307 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
4308 goto err2;
4309
7d740264 4310 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
c3e1b005
PM		 4311 if (timeout > 0) {
4312 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
4313 if (timeout != set->timeout)
4314 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
4315 }
fe2811eb 4316
8aeff920
PNA		 4317 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
4318 if (!(set->flags & NFT_SET_OBJECT)) {
4319 err = -EINVAL;
4320 goto err2;
4321 }
cac20fcd
PNA		 4322 obj = nft_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
4323 set->objtype, genmask);
8aeff920
PNA		 4324 if (IS_ERR(obj)) {
4325 err = PTR_ERR(obj);
4326 goto err2;
4327 }
4328 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
4329 }
4330
20a69341 4331 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
d0a11fc3
PM		 4332 err = nft_data_init(ctx, &data, sizeof(data), &d2,
4333 nla[NFTA_SET_ELEM_DATA]);
20a69341
PM		 4334 if (err < 0)
4335 goto err2;
4336
4337 err = -EINVAL;
4338 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
4339 goto err3;
4340
4341 dreg = nft_type_to_reg(set->dtype);
4342 list_for_each_entry(binding, &set->bindings, list) {
4343 struct nft_ctx bind_ctx = {
58c78e10 4344 .net = ctx->net,
36596dad 4345 .family = ctx->family,
20a69341 4346 .table = ctx->table,
7c95f6d8 4347 .chain = (struct nft_chain *)binding->chain,
20a69341
PM		 4348 };
4349
11113e19
PM		 4350 if (!(binding->flags & NFT_SET_MAP))
4351 continue;
4352
1ec10212
PM		 4353 err = nft_validate_register_store(&bind_ctx, dreg,
4354 &data,
4355 d2.type, d2.len);
20a69341
PM		 4356 if (err < 0)
4357 goto err3;
a654de8f
PNA		 4358
4359 if (d2.type == NFT_DATA_VERDICT &&
4360 (data.verdict.code == NFT_GOTO ||
4361 data.verdict.code == NFT_JUMP))
4362 nft_validate_state_update(ctx->net,
4363 NFT_VALIDATE_NEED);
20a69341 4364 }
fe2811eb 4365
7d740264 4366 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
20a69341
PM		 4367 }
4368
68e942e8
PM		 4369 /* The full maximum length of userdata can exceed the maximum
4370 * offset value (U8_MAX) for following extensions, therefor it
4371 * must be the last extension added.
4372 */
4373 ulen = 0;
4374 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
4375 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
4376 if (ulen > 0)
4377 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
4378 ulen);
4379 }
4380
fe2811eb 4381 err = -ENOMEM;
7d740264 4382 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
c3e1b005 4383 timeout, GFP_KERNEL);
fe2811eb
PM		 4384 if (elem.priv == NULL)
4385 goto err3;
4386
4387 ext = nft_set_elem_ext(set, elem.priv);
4388 if (flags)
4389 *nft_set_ext_flags(ext) = flags;
68e942e8
PM		 4390 if (ulen > 0) {
4391 udata = nft_set_ext_userdata(ext);
4392 udata->len = ulen - 1;
4393 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
4394 }
8aeff920
PNA		 4395 if (obj) {
4396 *nft_set_ext_obj(ext) = obj;
4397 obj->use++;
4398 }
fe2811eb 4399
60319eb1
PNA		 4400 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
4401 if (trans == NULL)
fe2811eb 4402 goto err4;
60319eb1 4403
69086658 4404 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
c016c7e4
PNA		 4405 err = set->ops->insert(ctx->net, set, &elem, &ext2);
4406 if (err) {
4407 if (err == -EEXIST) {
9744a6fc
PNA		 4408 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
4409 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
4410 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
f0dfd7a2
CIK		 4411 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
4412 err = -EBUSY;
4413 goto err5;
4414 }
8aeff920
PNA		 4415 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4416 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
4417 memcmp(nft_set_ext_data(ext),
4418 nft_set_ext_data(ext2), set->dlen) != 0) ||
4419 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4420 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
4421 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
c016c7e4
PNA		 4422 err = -EBUSY;
4423 else if (!(nlmsg_flags & NLM_F_EXCL))
4424 err = 0;
4425 }
fe2811eb 4426 goto err5;
c016c7e4 4427 }
20a69341 4428
35d0ac90
PNA		 4429 if (set->size &&
4430 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
4431 err = -ENFILE;
4432 goto err6;
4433 }
4434
60319eb1 4435 nft_trans_elem(trans) = elem;
46bbafce 4436 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
20a69341
PM		 4437 return 0;
4438
35d0ac90 4439err6:
5cb82a38 4440 set->ops->remove(ctx->net, set, &elem);
fe2811eb 4441err5:
60319eb1 4442 kfree(trans);
fe2811eb
PM		 4443err4:
4444 kfree(elem.priv);
20a69341
PM		 4445err3:
4446 if (nla[NFTA_SET_ELEM_DATA] != NULL)
59105446 4447 nft_data_release(&data, d2.type);
20a69341 4448err2:
59105446 4449 nft_data_release(&elem.key.val, d1.type);
20a69341
PM		 4450err1:
4451 return err;
4452}
4453
633c9a84
PNA		 4454static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
4455 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4456 const struct nlattr * const nla[],
4457 struct netlink_ext_ack *extack)
20a69341 4458{
f2a6d766 4459 u8 genmask = nft_genmask_next(net);
20a69341
PM		 4460 const struct nlattr *attr;
4461 struct nft_set *set;
4462 struct nft_ctx ctx;
a654de8f 4463 int rem, err;
20a69341 4464
7d5570ca
PNA		 4465 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
4466 return -EINVAL;
4467
36dd1bcc
PNA		 4468 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4469 genmask);
20a69341
PM		 4470 if (err < 0)
4471 return err;
4472
a3073c17
PNA		 4473 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4474 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
4475 if (IS_ERR(set))
4476 return PTR_ERR(set);
958bee14 4477
20a69341
PM		 4478 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4479 return -EBUSY;
4480
4481 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
c016c7e4 4482 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
35d0ac90 4483 if (err < 0)
a654de8f 4484 return err;
20a69341 4485 }
a654de8f
PNA		 4486
4487 if (net->nft.validate_state == NFT_VALIDATE_DO)
4488 return nft_table_validate(net, ctx.table);
4489
4490 return 0;
20a69341
PM		 4491}
4492
59105446
PNA		 4493/**
4494 * nft_data_hold - hold a nft_data item
4495 *
4496 * @data: struct nft_data to release
4497 * @type: type of data
4498 *
4499 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4500 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
4501 * NFT_GOTO verdicts. This function must be called on active data objects
4502 * from the second phase of the commit protocol.
4503 */
bb7b40ae 4504void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
59105446
PNA		 4505{
4506 if (type == NFT_DATA_VERDICT) {
4507 switch (data->verdict.code) {
4508 case NFT_JUMP:
4509 case NFT_GOTO:
4510 data->verdict.chain->use++;
4511 break;
4512 }
4513 }
4514}
4515
4516static void nft_set_elem_activate(const struct net *net,
4517 const struct nft_set *set,
4518 struct nft_set_elem *elem)
4519{
4520 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4521
4522 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4523 nft_data_hold(nft_set_ext_data(ext), set->dtype);
4524 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4525 (*nft_set_ext_obj(ext))->use++;
4526}
4527
4528static void nft_set_elem_deactivate(const struct net *net,
4529 const struct nft_set *set,
4530 struct nft_set_elem *elem)
4531{
4532 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4533
4534 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4535 nft_data_release(nft_set_ext_data(ext), set->dtype);
4536 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4537 (*nft_set_ext_obj(ext))->use--;
4538}
4539
60319eb1 4540static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 4541 const struct nlattr *attr)
4542{
4543 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3971ca14 4544 struct nft_set_ext_tmpl tmpl;
20a69341
PM		 4545 struct nft_data_desc desc;
4546 struct nft_set_elem elem;
3971ca14 4547 struct nft_set_ext *ext;
60319eb1 4548 struct nft_trans *trans;
3971ca14
PNA		 4549 u32 flags = 0;
4550 void *priv;
20a69341
PM		 4551 int err;
4552
4553 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
fceb6435 4554 nft_set_elem_policy, NULL);
20a69341
PM		 4555 if (err < 0)
4556 goto err1;
4557
4558 err = -EINVAL;
4559 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4560 goto err1;
4561
3971ca14
PNA		 4562 nft_set_ext_prepare(&tmpl);
4563
4564 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4565 if (err < 0)
4566 return err;
4567 if (flags != 0)
4568 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4569
7d740264 4570 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
d0a11fc3 4571 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 4572 if (err < 0)
4573 goto err1;
4574
4575 err = -EINVAL;
4576 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4577 goto err2;
4578
3971ca14
PNA		 4579 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
4580
4581 err = -ENOMEM;
4582 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
4583 GFP_KERNEL);
4584 if (elem.priv == NULL)
4585 goto err2;
4586
4587 ext = nft_set_elem_ext(set, elem.priv);
4588 if (flags)
4589 *nft_set_ext_flags(ext) = flags;
4590
60319eb1 4591 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
609ccf08
JL		 4592 if (trans == NULL) {
4593 err = -ENOMEM;
3971ca14 4594 goto err3;
609ccf08 4595 }
20a69341 4596
42a55769 4597 priv = set->ops->deactivate(ctx->net, set, &elem);
3971ca14 4598 if (priv == NULL) {
cc02e457 4599 err = -ENOENT;
3971ca14 4600 goto err4;
cc02e457 4601 }
3971ca14
PNA		 4602 kfree(elem.priv);
4603 elem.priv = priv;
cc02e457 4604
59105446
PNA		 4605 nft_set_elem_deactivate(ctx->net, set, &elem);
4606
60319eb1 4607 nft_trans_elem(trans) = elem;
46bbafce 4608 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
0dc13625 4609 return 0;
cc02e457 4610
3971ca14 4611err4:
cc02e457 4612 kfree(trans);
3971ca14
PNA		 4613err3:
4614 kfree(elem.priv);
20a69341 4615err2:
59105446 4616 nft_data_release(&elem.key.val, desc.type);
20a69341
PM		 4617err1:
4618 return err;
4619}
4620
8411b644 4621static int nft_flush_set(const struct nft_ctx *ctx,
de70185d 4622 struct nft_set *set,
8411b644 4623 const struct nft_set_iter *iter,
de70185d 4624 struct nft_set_elem *elem)
8411b644
PNA		 4625{
4626 struct nft_trans *trans;
4627 int err;
4628
4629 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
4630 sizeof(struct nft_trans_elem), GFP_ATOMIC);
4631 if (!trans)
4632 return -ENOMEM;
4633
1ba1c414 4634 if (!set->ops->flush(ctx->net, set, elem->priv)) {
8411b644
PNA		 4635 err = -ENOENT;
4636 goto err1;
4637 }
b2c11e4b 4638 set->ndeact++;
8411b644 4639
de70185d
PNA		 4640 nft_trans_elem_set(trans) = set;
4641 nft_trans_elem(trans) = *elem;
8411b644
PNA		 4642 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4643
4644 return 0;
4645err1:
4646 kfree(trans);
4647 return err;
4648}
4649
633c9a84
PNA		 4650static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
4651 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4652 const struct nlattr * const nla[],
4653 struct netlink_ext_ack *extack)
20a69341 4654{
f2a6d766 4655 u8 genmask = nft_genmask_next(net);
20a69341
PM		 4656 const struct nlattr *attr;
4657 struct nft_set *set;
4658 struct nft_ctx ctx;
60319eb1 4659 int rem, err = 0;
20a69341 4660
36dd1bcc
PNA		 4661 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4662 genmask);
20a69341
PM		 4663 if (err < 0)
4664 return err;
4665
cac20fcd 4666 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
20a69341
PM		 4667 if (IS_ERR(set))
4668 return PTR_ERR(set);
4669 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4670 return -EBUSY;
4671
8411b644 4672 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
baa2d42c
PNA		 4673 struct nft_set_iter iter = {
4674 .genmask = genmask,
4675 .fn = nft_flush_set,
8411b644 4676 };
baa2d42c 4677 set->ops->walk(&ctx, set, &iter);
8411b644 4678
baa2d42c 4679 return iter.err;
8411b644
PNA		 4680 }
4681
20a69341
PM		 4682 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4683 err = nft_del_setelem(&ctx, set, attr);
4684 if (err < 0)
60319eb1 4685 break;
4fefee57 4686
3dd0673a 4687 set->ndeact++;
20a69341 4688 }
60319eb1 4689 return err;
20a69341
PM		 4690}
4691
cfed7e1b
PM		 4692void nft_set_gc_batch_release(struct rcu_head *rcu)
4693{
4694 struct nft_set_gc_batch *gcb;
4695 unsigned int i;
4696
4697 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4698 for (i = 0; i < gcb->head.cnt; i++)
61f9e292 4699 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
cfed7e1b
PM		 4700 kfree(gcb);
4701}
4702EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4703
4704struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4705 gfp_t gfp)
4706{
4707 struct nft_set_gc_batch *gcb;
4708
4709 gcb = kzalloc(sizeof(*gcb), gfp);
4710 if (gcb == NULL)
4711 return gcb;
4712 gcb->head.set = set;
4713 return gcb;
4714}
4715EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4716
e5009240
PNA		 4717/*
4718 * Stateful objects
4719 */
4720
4721/**
4722 * nft_register_obj- register nf_tables stateful object type
4723 * @obj: object type
4724 *
4725 * Registers the object type for use with nf_tables. Returns zero on
4726 * success or a negative errno code otherwise.
4727 */
4728int nft_register_obj(struct nft_object_type *obj_type)
4729{
4730 if (obj_type->type == NFT_OBJECT_UNSPEC)
4731 return -EINVAL;
4732
4733 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4734 list_add_rcu(&obj_type->list, &nf_tables_objects);
4735 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4736 return 0;
4737}
4738EXPORT_SYMBOL_GPL(nft_register_obj);
4739
4740/**
4741 * nft_unregister_obj - unregister nf_tables object type
4742 * @obj: object type
4743 *
4744 * Unregisters the object type for use with nf_tables.
4745 */
4746void nft_unregister_obj(struct nft_object_type *obj_type)
4747{
4748 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4749 list_del_rcu(&obj_type->list);
4750 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4751}
4752EXPORT_SYMBOL_GPL(nft_unregister_obj);
4753
cac20fcd
PNA		 4754struct nft_object *nft_obj_lookup(const struct nft_table *table,
4755 const struct nlattr *nla, u32 objtype,
4756 u8 genmask)
e5009240
PNA		 4757{
4758 struct nft_object *obj;
4759
d9adf22a 4760 list_for_each_entry_rcu(obj, &table->objects, list) {
e5009240 4761 if (!nla_strcmp(nla, obj->name) &&
dfc46034 4762 objtype == obj->ops->type->type &&
e5009240
PNA		 4763 nft_active_genmask(obj, genmask))
4764 return obj;
4765 }
4766 return ERR_PTR(-ENOENT);
4767}
cac20fcd 4768EXPORT_SYMBOL_GPL(nft_obj_lookup);
e5009240 4769
cac20fcd
PNA		 4770static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
4771 const struct nlattr *nla,
4772 u32 objtype, u8 genmask)
3ecbfd65
HS		 4773{
4774 struct nft_object *obj;
4775
4776 list_for_each_entry(obj, &table->objects, list) {
4777 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
4778 objtype == obj->ops->type->type &&
4779 nft_active_genmask(obj, genmask))
4780 return obj;
4781 }
4782 return ERR_PTR(-ENOENT);
4783}
4784
e5009240 4785static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
b2fbd044
LZ		 4786 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4787 .len = NFT_TABLE_MAXNAMELEN - 1 },
4788 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4789 .len = NFT_OBJ_MAXNAMELEN - 1 },
e5009240
PNA		 4790 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4791 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
3ecbfd65 4792 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
e5009240
PNA		 4793};
4794
84fba055
FW		 4795static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4796 const struct nft_object_type *type,
e5009240
PNA		 4797 const struct nlattr *attr)
4798{
5b4c6e38 4799 struct nlattr **tb;
dfc46034 4800 const struct nft_object_ops *ops;
e5009240 4801 struct nft_object *obj;
5b4c6e38
GS		 4802 int err = -ENOMEM;
4803
4804 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
4805 if (!tb)
4806 goto err1;
e5009240
PNA		 4807
4808 if (attr) {
fceb6435
JB		 4809 err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
4810 NULL);
e5009240 4811 if (err < 0)
5b4c6e38 4812 goto err2;
e5009240
PNA		 4813 } else {
4814 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4815 }
4816
dfc46034
PBG		 4817 if (type->select_ops) {
4818 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
4819 if (IS_ERR(ops)) {
4820 err = PTR_ERR(ops);
5b4c6e38 4821 goto err2;
dfc46034
PBG		 4822 }
4823 } else {
4824 ops = type->ops;
4825 }
4826
e5009240 4827 err = -ENOMEM;
dfc46034 4828 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
5b4c6e38
GS		 4829 if (!obj)
4830 goto err2;
e5009240 4831
dfc46034 4832 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
e5009240 4833 if (err < 0)
5b4c6e38 4834 goto err3;
e5009240 4835
dfc46034
PBG		 4836 obj->ops = ops;
4837
5b4c6e38 4838 kfree(tb);
e5009240 4839 return obj;
5b4c6e38 4840err3:
e5009240 4841 kfree(obj);
5b4c6e38
GS		 4842err2:
4843 kfree(tb);
e5009240
PNA		 4844err1:
4845 return ERR_PTR(err);
4846}
4847
4848static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
43da04a5 4849 struct nft_object *obj, bool reset)
e5009240
PNA		 4850{
4851 struct nlattr *nest;
4852
4853 nest = nla_nest_start(skb, attr);
4854 if (!nest)
4855 goto nla_put_failure;
dfc46034 4856 if (obj->ops->dump(skb, obj, reset) < 0)
e5009240
PNA		 4857 goto nla_put_failure;
4858 nla_nest_end(skb, nest);
4859 return 0;
4860
4861nla_put_failure:
4862 return -1;
4863}
4864
4865static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4866{
4867 const struct nft_object_type *type;
4868
4869 list_for_each_entry(type, &nf_tables_objects, list) {
4870 if (objtype == type->type)
4871 return type;
4872 }
4873 return NULL;
4874}
4875
452238e8
FW		 4876static const struct nft_object_type *
4877nft_obj_type_get(struct net *net, u32 objtype)
e5009240
PNA		 4878{
4879 const struct nft_object_type *type;
4880
4881 type = __nft_obj_type_get(objtype);
4882 if (type != NULL && try_module_get(type->owner))
4883 return type;
4884
f102d66b 4885 lockdep_nfnl_nft_mutex_not_held();
e5009240
PNA		 4886#ifdef CONFIG_MODULES
4887 if (type == NULL) {
452238e8 4888 nft_request_module(net, "nft-obj-%u", objtype);
e5009240
PNA		 4889 if (__nft_obj_type_get(objtype))
4890 return ERR_PTR(-EAGAIN);
4891 }
4892#endif
4893 return ERR_PTR(-ENOENT);
4894}
4895
4896static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4897 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4898 const struct nlattr * const nla[],
4899 struct netlink_ext_ack *extack)
e5009240
PNA		 4900{
4901 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4902 const struct nft_object_type *type;
4903 u8 genmask = nft_genmask_next(net);
4904 int family = nfmsg->nfgen_family;
e5009240
PNA		 4905 struct nft_table *table;
4906 struct nft_object *obj;
4907 struct nft_ctx ctx;
4908 u32 objtype;
4909 int err;
4910
4911 if (!nla[NFTA_OBJ_TYPE] ||
4912 !nla[NFTA_OBJ_NAME] ||
4913 !nla[NFTA_OBJ_DATA])
4914 return -EINVAL;
4915
cac20fcd 4916 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
36dd1bcc
PNA		 4917 if (IS_ERR(table)) {
4918 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
e5009240 4919 return PTR_ERR(table);
36dd1bcc 4920 }
e5009240
PNA		 4921
4922 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
cac20fcd 4923 obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
e5009240
PNA		 4924 if (IS_ERR(obj)) {
4925 err = PTR_ERR(obj);
36dd1bcc
PNA		 4926 if (err != -ENOENT) {
4927 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
e5009240 4928 return err;
36dd1bcc 4929 }
1a28ad74 4930 } else {
36dd1bcc
PNA		 4931 if (nlh->nlmsg_flags & NLM_F_EXCL) {
4932 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
e5009240 4933 return -EEXIST;
36dd1bcc 4934 }
e5009240
PNA		 4935 return 0;
4936 }
4937
98319cb9 4938 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
e5009240 4939
452238e8 4940 type = nft_obj_type_get(net, objtype);
e5009240
PNA		 4941 if (IS_ERR(type))
4942 return PTR_ERR(type);
4943
84fba055 4944 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
e5009240
PNA		 4945 if (IS_ERR(obj)) {
4946 err = PTR_ERR(obj);
4947 goto err1;
4948 }
18965317 4949 obj->table = table;
3ecbfd65
HS		 4950 obj->handle = nf_tables_alloc_handle(table);
4951
61509575
PS		 4952 obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
4953 if (!obj->name) {
4954 err = -ENOMEM;
4955 goto err2;
4956 }
e5009240
PNA		 4957
4958 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4959 if (err < 0)
61509575 4960 goto err3;
e5009240
PNA		 4961
4962 list_add_tail_rcu(&obj->list, &table->objects);
4963 table->use++;
4964 return 0;
61509575
PS		 4965err3:
4966 kfree(obj->name);
e5009240 4967err2:
dfc46034 4968 if (obj->ops->destroy)
00bfb320 4969 obj->ops->destroy(&ctx, obj);
e5009240
PNA		 4970 kfree(obj);
4971err1:
4972 module_put(type->owner);
4973 return err;
4974}
4975
4976static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4977 u32 portid, u32 seq, int event, u32 flags,
4978 int family, const struct nft_table *table,
43da04a5 4979 struct nft_object *obj, bool reset)
e5009240
PNA		 4980{
4981 struct nfgenmsg *nfmsg;
4982 struct nlmsghdr *nlh;
4983
dedb67c4 4984 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
e5009240
PNA		 4985 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4986 if (nlh == NULL)
4987 goto nla_put_failure;
4988
4989 nfmsg = nlmsg_data(nlh);
4990 nfmsg->nfgen_family = family;
4991 nfmsg->version = NFNETLINK_V0;
4992 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4993
4994 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4995 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
dfc46034 4996 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
e5009240 4997 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
3ecbfd65
HS		 4998 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
4999 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
5000 NFTA_OBJ_PAD))
e5009240
PNA		 5001 goto nla_put_failure;
5002
5003 nlmsg_end(skb, nlh);
5004 return 0;
5005
5006nla_put_failure:
5007 nlmsg_trim(skb, nlh);
5008 return -1;
5009}
5010
a9fea2a3 5011struct nft_obj_filter {
e46abbcc 5012 char *table;
a9fea2a3
PNA		 5013 u32 type;
5014};
5015
e5009240
PNA		 5016static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
5017{
5018 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
e5009240 5019 const struct nft_table *table;
e5009240 5020 unsigned int idx = 0, s_idx = cb->args[0];
a9fea2a3 5021 struct nft_obj_filter *filter = cb->data;
e5009240
PNA		 5022 struct net *net = sock_net(skb->sk);
5023 int family = nfmsg->nfgen_family;
43da04a5
PNA		 5024 struct nft_object *obj;
5025 bool reset = false;
5026
5027 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5028 reset = true;
e5009240
PNA		 5029
5030 rcu_read_lock();
5031 cb->seq = net->nft.base_seq;
5032
36596dad 5033 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 5034 if (family != NFPROTO_UNSPEC && family != table->family)
e5009240
PNA		 5035 continue;
5036
36596dad
PNA		 5037 list_for_each_entry_rcu(obj, &table->objects, list) {
5038 if (!nft_is_active(net, obj))
5039 goto cont;
5040 if (idx < s_idx)
5041 goto cont;
5042 if (idx > s_idx)
5043 memset(&cb->args[1], 0,
5044 sizeof(cb->args) - sizeof(cb->args[0]));
360cc79d 5045 if (filter && filter->table &&
36596dad
PNA		 5046 strcmp(filter->table, table->name))
5047 goto cont;
5048 if (filter &&
5049 filter->type != NFT_OBJECT_UNSPEC &&
5050 obj->ops->type->type != filter->type)
5051 goto cont;
a9fea2a3 5052
36596dad
PNA		 5053 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
5054 cb->nlh->nlmsg_seq,
5055 NFT_MSG_NEWOBJ,
5056 NLM_F_MULTI | NLM_F_APPEND,
98319cb9 5057 table->family, table,
36596dad
PNA		 5058 obj, reset) < 0)
5059 goto done;
e5009240 5060
36596dad 5061 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
e5009240 5062cont:
36596dad 5063 idx++;
e5009240
PNA		 5064 }
5065 }
5066done:
5067 rcu_read_unlock();
5068
5069 cb->args[0] = idx;
5070 return skb->len;
5071}
5072
90fd131a 5073static int nf_tables_dump_obj_start(struct netlink_callback *cb)
a9fea2a3 5074{
90fd131a
FW		 5075 const struct nlattr * const *nla = cb->data;
5076 struct nft_obj_filter *filter = NULL;
e46abbcc 5077
90fd131a
FW		 5078 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
5079 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5080 if (!filter)
5081 return -ENOMEM;
5082
5083 if (nla[NFTA_OBJ_TABLE]) {
5084 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
5085 if (!filter->table) {
5086 kfree(filter);
5087 return -ENOMEM;
5088 }
5089 }
5090
5091 if (nla[NFTA_OBJ_TYPE])
5092 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
8bea728d 5093 }
a9fea2a3 5094
90fd131a 5095 cb->data = filter;
a9fea2a3
PNA		 5096 return 0;
5097}
5098
90fd131a 5099static int nf_tables_dump_obj_done(struct netlink_callback *cb)
a9fea2a3 5100{
90fd131a 5101 struct nft_obj_filter *filter = cb->data;
a9fea2a3 5102
90fd131a
FW		 5103 if (filter) {
5104 kfree(filter->table);
5105 kfree(filter);
e46abbcc 5106 }
a9fea2a3 5107
90fd131a 5108 return 0;
a9fea2a3
PNA		 5109}
5110
d9adf22a 5111/* called with rcu_read_lock held */
e5009240
PNA		 5112static int nf_tables_getobj(struct net *net, struct sock *nlsk,
5113 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 5114 const struct nlattr * const nla[],
5115 struct netlink_ext_ack *extack)
e5009240
PNA		 5116{
5117 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5118 u8 genmask = nft_genmask_cur(net);
5119 int family = nfmsg->nfgen_family;
e5009240
PNA		 5120 const struct nft_table *table;
5121 struct nft_object *obj;
5122 struct sk_buff *skb2;
43da04a5 5123 bool reset = false;
e5009240
PNA		 5124 u32 objtype;
5125 int err;
5126
5127 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5128 struct netlink_dump_control c = {
90fd131a 5129 .start = nf_tables_dump_obj_start,
e5009240 5130 .dump = nf_tables_dump_obj,
a9fea2a3 5131 .done = nf_tables_dump_obj_done,
d9adf22a 5132 .module = THIS_MODULE,
90fd131a 5133 .data = (void *)nla,
e5009240 5134 };
a9fea2a3 5135
d9adf22a 5136 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
e5009240
PNA		 5137 }
5138
5139 if (!nla[NFTA_OBJ_NAME] ||
5140 !nla[NFTA_OBJ_TYPE])
5141 return -EINVAL;
5142
cac20fcd 5143 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
36dd1bcc
PNA		 5144 if (IS_ERR(table)) {
5145 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
e5009240 5146 return PTR_ERR(table);
36dd1bcc 5147 }
e5009240
PNA		 5148
5149 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
cac20fcd 5150 obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
36dd1bcc
PNA		 5151 if (IS_ERR(obj)) {
5152 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
e5009240 5153 return PTR_ERR(obj);
36dd1bcc 5154 }
e5009240 5155
d9adf22a 5156 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
e5009240
PNA		 5157 if (!skb2)
5158 return -ENOMEM;
5159
43da04a5
PNA		 5160 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5161 reset = true;
5162
e5009240
PNA		 5163 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
5164 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
43da04a5 5165 family, table, obj, reset);
e5009240
PNA		 5166 if (err < 0)
5167 goto err;
5168
5169 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5170err:
5171 kfree_skb(skb2);
5172 return err;
e5009240
PNA		 5173}
5174
00bfb320 5175static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
e5009240 5176{
dfc46034 5177 if (obj->ops->destroy)
00bfb320 5178 obj->ops->destroy(ctx, obj);
e5009240 5179
dfc46034 5180 module_put(obj->ops->type->owner);
61509575 5181 kfree(obj->name);
e5009240
PNA		 5182 kfree(obj);
5183}
5184
5185static int nf_tables_delobj(struct net *net, struct sock *nlsk,
04ba724b
PNA		 5186 struct sk_buff *skb, const struct nlmsghdr *nlh,
5187 const struct nlattr * const nla[],
5188 struct netlink_ext_ack *extack)
e5009240
PNA		 5189{
5190 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5191 u8 genmask = nft_genmask_next(net);
5192 int family = nfmsg->nfgen_family;
36dd1bcc 5193 const struct nlattr *attr;
e5009240
PNA		 5194 struct nft_table *table;
5195 struct nft_object *obj;
5196 struct nft_ctx ctx;
5197 u32 objtype;
5198
5199 if (!nla[NFTA_OBJ_TYPE] ||
3ecbfd65 5200 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
e5009240
PNA		 5201 return -EINVAL;
5202
cac20fcd 5203 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
36dd1bcc
PNA		 5204 if (IS_ERR(table)) {
5205 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
e5009240 5206 return PTR_ERR(table);
36dd1bcc 5207 }
e5009240
PNA		 5208
5209 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
36dd1bcc
PNA		 5210 if (nla[NFTA_OBJ_HANDLE]) {
5211 attr = nla[NFTA_OBJ_HANDLE];
5212 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
5213 } else {
5214 attr = nla[NFTA_OBJ_NAME];
5215 obj = nft_obj_lookup(table, attr, objtype, genmask);
5216 }
5217
5218 if (IS_ERR(obj)) {
5219 NL_SET_BAD_ATTR(extack, attr);
e5009240 5220 return PTR_ERR(obj);
36dd1bcc
PNA		 5221 }
5222 if (obj->use > 0) {
5223 NL_SET_BAD_ATTR(extack, attr);
e5009240 5224 return -EBUSY;
36dd1bcc 5225 }
e5009240 5226
98319cb9 5227 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
e5009240
PNA		 5228
5229 return nft_delobj(&ctx, obj);
5230}
5231
25e94a99
PNA		 5232void nft_obj_notify(struct net *net, struct nft_table *table,
5233 struct nft_object *obj, u32 portid, u32 seq, int event,
5234 int family, int report, gfp_t gfp)
e5009240
PNA		 5235{
5236 struct sk_buff *skb;
5237 int err;
5238
2599e989
PNA		 5239 if (!report &&
5240 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 5241 return;
e5009240 5242
2599e989 5243 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
e5009240
PNA		 5244 if (skb == NULL)
5245 goto err;
5246
2599e989
PNA		 5247 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
5248 table, obj, false);
e5009240
PNA		 5249 if (err < 0) {
5250 kfree_skb(skb);
5251 goto err;
5252 }
5253
25e94a99
PNA		 5254 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
5255 return;
e5009240 5256err:
25e94a99 5257 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
e5009240 5258}
2599e989
PNA		 5259EXPORT_SYMBOL_GPL(nft_obj_notify);
5260
25e94a99
PNA		 5261static void nf_tables_obj_notify(const struct nft_ctx *ctx,
5262 struct nft_object *obj, int event)
2599e989 5263{
25e94a99 5264 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
36596dad 5265 ctx->family, ctx->report, GFP_KERNEL);
2599e989 5266}
e5009240 5267
3b49e2e9
PNA		 5268/*
5269 * Flow tables
5270 */
5271void nft_register_flowtable_type(struct nf_flowtable_type *type)
5272{
5273 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5274 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
5275 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5276}
5277EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
5278
5279void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
5280{
5281 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5282 list_del_rcu(&type->list);
5283 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5284}
5285EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
5286
5287static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
5288 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
5289 .len = NFT_NAME_MAXLEN - 1 },
5290 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
5291 .len = NFT_NAME_MAXLEN - 1 },
5292 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
3ecbfd65 5293 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
3b49e2e9
PNA		 5294};
5295
cac20fcd
PNA		 5296struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
5297 const struct nlattr *nla, u8 genmask)
3b49e2e9
PNA		 5298{
5299 struct nft_flowtable *flowtable;
5300
d9adf22a 5301 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
3b49e2e9
PNA		 5302 if (!nla_strcmp(nla, flowtable->name) &&
5303 nft_active_genmask(flowtable, genmask))
5304 return flowtable;
5305 }
5306 return ERR_PTR(-ENOENT);
5307}
cac20fcd 5308EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
3b49e2e9 5309
ae0662f8 5310static struct nft_flowtable *
cac20fcd
PNA		 5311nft_flowtable_lookup_byhandle(const struct nft_table *table,
5312 const struct nlattr *nla, u8 genmask)
3ecbfd65
HS		 5313{
5314 struct nft_flowtable *flowtable;
5315
5316 list_for_each_entry(flowtable, &table->flowtables, list) {
5317 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
5318 nft_active_genmask(flowtable, genmask))
5319 return flowtable;
5320 }
5321 return ERR_PTR(-ENOENT);
5322}
5323
3b49e2e9
PNA		 5324static int nf_tables_parse_devices(const struct nft_ctx *ctx,
5325 const struct nlattr *attr,
5326 struct net_device *dev_array[], int *len)
5327{
5328 const struct nlattr *tmp;
5329 struct net_device *dev;
5330 char ifname[IFNAMSIZ];
5331 int rem, n = 0, err;
5332
5333 nla_for_each_nested(tmp, attr, rem) {
5334 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
5335 err = -EINVAL;
5336 goto err1;
5337 }
5338
5339 nla_strlcpy(ifname, tmp, IFNAMSIZ);
90d2723c 5340 dev = __dev_get_by_name(ctx->net, ifname);
3b49e2e9
PNA		 5341 if (!dev) {
5342 err = -ENOENT;
5343 goto err1;
5344 }
5345
5346 dev_array[n++] = dev;
5347 if (n == NFT_FLOWTABLE_DEVICE_MAX) {
5348 err = -EFBIG;
5349 goto err1;
5350 }
5351 }
5352 if (!len)
5353 return -EINVAL;
5354
5355 err = 0;
5356err1:
5357 *len = n;
5358 return err;
5359}
5360
5361static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
5362 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
5363 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
5364 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
5365};
5366
5367static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx,
5368 const struct nlattr *attr,
5369 struct nft_flowtable *flowtable)
5370{
5371 struct net_device *dev_array[NFT_FLOWTABLE_DEVICE_MAX];
5372 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
5373 struct nf_hook_ops *ops;
5374 int hooknum, priority;
5375 int err, n = 0, i;
5376
5377 err = nla_parse_nested(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
5378 nft_flowtable_hook_policy, NULL);
5379 if (err < 0)
5380 return err;
5381
5382 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
5383 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] ||
5384 !tb[NFTA_FLOWTABLE_HOOK_DEVS])
5385 return -EINVAL;
5386
5387 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
fe19c04c 5388 if (hooknum != NF_NETDEV_INGRESS)
3b49e2e9
PNA		 5389 return -EINVAL;
5390
5391 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
5392
5393 err = nf_tables_parse_devices(ctx, tb[NFTA_FLOWTABLE_HOOK_DEVS],
5394 dev_array, &n);
5395 if (err < 0)
d92191aa 5396 return err;
3b49e2e9 5397
6396bb22 5398 ops = kcalloc(n, sizeof(struct nf_hook_ops), GFP_KERNEL);
90d2723c
PNA		 5399 if (!ops)
5400 return -ENOMEM;
3b49e2e9 5401
0e839dfa
PNA		 5402 flowtable->hooknum = hooknum;
5403 flowtable->priority = priority;
3b49e2e9
PNA		 5404 flowtable->ops = ops;
5405 flowtable->ops_len = n;
5406
5407 for (i = 0; i < n; i++) {
5408 flowtable->ops[i].pf = NFPROTO_NETDEV;
5409 flowtable->ops[i].hooknum = hooknum;
5410 flowtable->ops[i].priority = priority;
17857d92 5411 flowtable->ops[i].priv = &flowtable->data;
3b49e2e9
PNA		 5412 flowtable->ops[i].hook = flowtable->data.type->hook;
5413 flowtable->ops[i].dev = dev_array[i];
5414 }
5415
3b49e2e9
PNA		 5416 return err;
5417}
5418
98319cb9 5419static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
3b49e2e9
PNA		 5420{
5421 const struct nf_flowtable_type *type;
5422
5423 list_for_each_entry(type, &nf_tables_flowtables, list) {
98319cb9 5424 if (family == type->family)
3b49e2e9
PNA		 5425 return type;
5426 }
5427 return NULL;
5428}
5429
452238e8
FW		 5430static const struct nf_flowtable_type *
5431nft_flowtable_type_get(struct net *net, u8 family)
3b49e2e9
PNA		 5432{
5433 const struct nf_flowtable_type *type;
5434
98319cb9 5435 type = __nft_flowtable_type_get(family);
3b49e2e9
PNA		 5436 if (type != NULL && try_module_get(type->owner))
5437 return type;
5438
f102d66b 5439 lockdep_nfnl_nft_mutex_not_held();
3b49e2e9
PNA		 5440#ifdef CONFIG_MODULES
5441 if (type == NULL) {
452238e8 5442 nft_request_module(net, "nf-flowtable-%u", family);
98319cb9 5443 if (__nft_flowtable_type_get(family))
3b49e2e9
PNA		 5444 return ERR_PTR(-EAGAIN);
5445 }
5446#endif
5447 return ERR_PTR(-ENOENT);
5448}
5449
3b49e2e9
PNA		 5450static void nft_unregister_flowtable_net_hooks(struct net *net,
5451 struct nft_flowtable *flowtable)
5452{
5453 int i;
5454
5455 for (i = 0; i < flowtable->ops_len; i++) {
5456 if (!flowtable->ops[i].dev)
5457 continue;
5458
5459 nf_unregister_net_hook(net, &flowtable->ops[i]);
5460 }
5461}
5462
5463static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
5464 struct sk_buff *skb,
5465 const struct nlmsghdr *nlh,
5466 const struct nlattr * const nla[],
5467 struct netlink_ext_ack *extack)
5468{
5469 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5470 const struct nf_flowtable_type *type;
32fc7187 5471 struct nft_flowtable *flowtable, *ft;
3b49e2e9
PNA		 5472 u8 genmask = nft_genmask_next(net);
5473 int family = nfmsg->nfgen_family;
3b49e2e9
PNA		 5474 struct nft_table *table;
5475 struct nft_ctx ctx;
5476 int err, i, k;
5477
5478 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5479 !nla[NFTA_FLOWTABLE_NAME] ||
5480 !nla[NFTA_FLOWTABLE_HOOK])
5481 return -EINVAL;
5482
cac20fcd
PNA		 5483 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5484 genmask);
36dd1bcc
PNA		 5485 if (IS_ERR(table)) {
5486 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
3b49e2e9 5487 return PTR_ERR(table);
36dd1bcc 5488 }
3b49e2e9 5489
cac20fcd
PNA		 5490 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5491 genmask);
3b49e2e9
PNA		 5492 if (IS_ERR(flowtable)) {
5493 err = PTR_ERR(flowtable);
36dd1bcc
PNA		 5494 if (err != -ENOENT) {
5495 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
3b49e2e9 5496 return err;
36dd1bcc 5497 }
3b49e2e9 5498 } else {
36dd1bcc
PNA		 5499 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5500 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
3b49e2e9 5501 return -EEXIST;
36dd1bcc 5502 }
3b49e2e9
PNA		 5503
5504 return 0;
5505 }
5506
98319cb9 5507 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
3b49e2e9
PNA		 5508
5509 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
5510 if (!flowtable)
5511 return -ENOMEM;
5512
5513 flowtable->table = table;
3ecbfd65
HS		 5514 flowtable->handle = nf_tables_alloc_handle(table);
5515
3b49e2e9
PNA		 5516 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
5517 if (!flowtable->name) {
5518 err = -ENOMEM;
5519 goto err1;
5520 }
5521
452238e8 5522 type = nft_flowtable_type_get(net, family);
3b49e2e9
PNA		 5523 if (IS_ERR(type)) {
5524 err = PTR_ERR(type);
5525 goto err2;
5526 }
5527
5528 flowtable->data.type = type;
a268de77 5529 err = type->init(&flowtable->data);
3b49e2e9
PNA		 5530 if (err < 0)
5531 goto err3;
5532
5533 err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
5534 flowtable);
5535 if (err < 0)
a268de77 5536 goto err4;
3b49e2e9
PNA		 5537
5538 for (i = 0; i < flowtable->ops_len; i++) {
32fc7187
PNA		 5539 if (!flowtable->ops[i].dev)
5540 continue;
5541
5542 list_for_each_entry(ft, &table->flowtables, list) {
5543 for (k = 0; k < ft->ops_len; k++) {
5544 if (!ft->ops[k].dev)
5545 continue;
5546
5547 if (flowtable->ops[i].dev == ft->ops[k].dev &&
5548 flowtable->ops[i].pf == ft->ops[k].pf) {
5549 err = -EBUSY;
a268de77 5550 goto err5;
32fc7187
PNA		 5551 }
5552 }
5553 }
5554
3b49e2e9
PNA		 5555 err = nf_register_net_hook(net, &flowtable->ops[i]);
5556 if (err < 0)
a268de77 5557 goto err5;
3b49e2e9
PNA		 5558 }
5559
5560 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
5561 if (err < 0)
a268de77 5562 goto err6;
3b49e2e9
PNA		 5563
5564 list_add_tail_rcu(&flowtable->list, &table->flowtables);
5565 table->use++;
5566
5567 return 0;
a268de77 5568err6:
3b49e2e9 5569 i = flowtable->ops_len;
a268de77 5570err5:
b8088dda 5571 for (k = i - 1; k >= 0; k--)
0e0d5002 5572 nf_unregister_net_hook(net, &flowtable->ops[k]);
3b49e2e9
PNA		 5573
5574 kfree(flowtable->ops);
a268de77
FF		 5575err4:
5576 flowtable->data.type->free(&flowtable->data);
3b49e2e9
PNA		 5577err3:
5578 module_put(type->owner);
5579err2:
5580 kfree(flowtable->name);
5581err1:
5582 kfree(flowtable);
5583 return err;
5584}
5585
5586static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
5587 struct sk_buff *skb,
5588 const struct nlmsghdr *nlh,
5589 const struct nlattr * const nla[],
5590 struct netlink_ext_ack *extack)
5591{
5592 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5593 u8 genmask = nft_genmask_next(net);
5594 int family = nfmsg->nfgen_family;
5595 struct nft_flowtable *flowtable;
36dd1bcc 5596 const struct nlattr *attr;
3b49e2e9
PNA		 5597 struct nft_table *table;
5598 struct nft_ctx ctx;
5599
e603ea4b
PNA		 5600 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5601 (!nla[NFTA_FLOWTABLE_NAME] &&
5602 !nla[NFTA_FLOWTABLE_HANDLE]))
5603 return -EINVAL;
5604
cac20fcd
PNA		 5605 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5606 genmask);
36dd1bcc
PNA		 5607 if (IS_ERR(table)) {
5608 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
3b49e2e9 5609 return PTR_ERR(table);
36dd1bcc 5610 }
3b49e2e9 5611
36dd1bcc
PNA		 5612 if (nla[NFTA_FLOWTABLE_HANDLE]) {
5613 attr = nla[NFTA_FLOWTABLE_HANDLE];
5614 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
5615 } else {
5616 attr = nla[NFTA_FLOWTABLE_NAME];
5617 flowtable = nft_flowtable_lookup(table, attr, genmask);
5618 }
5619
5620 if (IS_ERR(flowtable)) {
5621 NL_SET_BAD_ATTR(extack, attr);
5622 return PTR_ERR(flowtable);
5623 }
5624 if (flowtable->use > 0) {
5625 NL_SET_BAD_ATTR(extack, attr);
3b49e2e9 5626 return -EBUSY;
36dd1bcc 5627 }
3b49e2e9 5628
98319cb9 5629 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
3b49e2e9
PNA		 5630
5631 return nft_delflowtable(&ctx, flowtable);
5632}
5633
5634static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
5635 u32 portid, u32 seq, int event,
5636 u32 flags, int family,
5637 struct nft_flowtable *flowtable)
5638{
5639 struct nlattr *nest, *nest_devs;
5640 struct nfgenmsg *nfmsg;
5641 struct nlmsghdr *nlh;
5642 int i;
5643
5644 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5645 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5646 if (nlh == NULL)
5647 goto nla_put_failure;
5648
5649 nfmsg = nlmsg_data(nlh);
5650 nfmsg->nfgen_family = family;
5651 nfmsg->version = NFNETLINK_V0;
5652 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5653
5654 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
5655 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
3ecbfd65
HS		 5656 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
5657 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
5658 NFTA_FLOWTABLE_PAD))
3b49e2e9
PNA		 5659 goto nla_put_failure;
5660
5661 nest = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK);
5662 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
5663 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->priority)))
5664 goto nla_put_failure;
5665
5666 nest_devs = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK_DEVS);
5667 if (!nest_devs)
5668 goto nla_put_failure;
5669
5670 for (i = 0; i < flowtable->ops_len; i++) {
b8088dda
FW		 5671 const struct net_device *dev = READ_ONCE(flowtable->ops[i].dev);
5672
5673 if (dev &&
5674 nla_put_string(skb, NFTA_DEVICE_NAME, dev->name))
3b49e2e9
PNA		 5675 goto nla_put_failure;
5676 }
5677 nla_nest_end(skb, nest_devs);
5678 nla_nest_end(skb, nest);
5679
5680 nlmsg_end(skb, nlh);
5681 return 0;
5682
5683nla_put_failure:
5684 nlmsg_trim(skb, nlh);
5685 return -1;
5686}
5687
5688struct nft_flowtable_filter {
5689 char *table;
5690};
5691
5692static int nf_tables_dump_flowtable(struct sk_buff *skb,
5693 struct netlink_callback *cb)
5694{
5695 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5696 struct nft_flowtable_filter *filter = cb->data;
5697 unsigned int idx = 0, s_idx = cb->args[0];
5698 struct net *net = sock_net(skb->sk);
5699 int family = nfmsg->nfgen_family;
5700 struct nft_flowtable *flowtable;
3b49e2e9
PNA		 5701 const struct nft_table *table;
5702
5703 rcu_read_lock();
5704 cb->seq = net->nft.base_seq;
5705
36596dad 5706 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 5707 if (family != NFPROTO_UNSPEC && family != table->family)
3b49e2e9
PNA		 5708 continue;
5709
36596dad
PNA		 5710 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5711 if (!nft_is_active(net, flowtable))
5712 goto cont;
5713 if (idx < s_idx)
5714 goto cont;
5715 if (idx > s_idx)
5716 memset(&cb->args[1], 0,
5717 sizeof(cb->args) - sizeof(cb->args[0]));
360cc79d 5718 if (filter && filter->table &&
36596dad
PNA		 5719 strcmp(filter->table, table->name))
5720 goto cont;
3b49e2e9 5721
36596dad
PNA		 5722 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
5723 cb->nlh->nlmsg_seq,
5724 NFT_MSG_NEWFLOWTABLE,
5725 NLM_F_MULTI | NLM_F_APPEND,
98319cb9 5726 table->family, flowtable) < 0)
36596dad 5727 goto done;
3b49e2e9 5728
36596dad 5729 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3b49e2e9 5730cont:
36596dad 5731 idx++;
3b49e2e9
PNA		 5732 }
5733 }
5734done:
5735 rcu_read_unlock();
5736
5737 cb->args[0] = idx;
5738 return skb->len;
5739}
5740
90fd131a 5741static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
3b49e2e9 5742{
90fd131a
FW		 5743 const struct nlattr * const *nla = cb->data;
5744 struct nft_flowtable_filter *filter = NULL;
3b49e2e9 5745
90fd131a
FW		 5746 if (nla[NFTA_FLOWTABLE_TABLE]) {
5747 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5748 if (!filter)
5749 return -ENOMEM;
3b49e2e9 5750
90fd131a
FW		 5751 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
5752 GFP_ATOMIC);
5753 if (!filter->table) {
5754 kfree(filter);
5755 return -ENOMEM;
5756 }
5757 }
3b49e2e9 5758
90fd131a 5759 cb->data = filter;
3b49e2e9
PNA		 5760 return 0;
5761}
5762
90fd131a 5763static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
3b49e2e9 5764{
90fd131a 5765 struct nft_flowtable_filter *filter = cb->data;
3b49e2e9 5766
3b49e2e9 5767 if (!filter)
90fd131a 5768 return 0;
3b49e2e9 5769
90fd131a
FW		 5770 kfree(filter->table);
5771 kfree(filter);
5772
5773 return 0;
3b49e2e9
PNA		 5774}
5775
d9adf22a 5776/* called with rcu_read_lock held */
3b49e2e9
PNA		 5777static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
5778 struct sk_buff *skb,
5779 const struct nlmsghdr *nlh,
5780 const struct nlattr * const nla[],
5781 struct netlink_ext_ack *extack)
5782{
5783 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5784 u8 genmask = nft_genmask_cur(net);
5785 int family = nfmsg->nfgen_family;
5786 struct nft_flowtable *flowtable;
3b49e2e9
PNA		 5787 const struct nft_table *table;
5788 struct sk_buff *skb2;
5789 int err;
5790
5791 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5792 struct netlink_dump_control c = {
90fd131a 5793 .start = nf_tables_dump_flowtable_start,
3b49e2e9
PNA		 5794 .dump = nf_tables_dump_flowtable,
5795 .done = nf_tables_dump_flowtable_done,
d9adf22a 5796 .module = THIS_MODULE,
90fd131a 5797 .data = (void *)nla,
3b49e2e9
PNA		 5798 };
5799
d9adf22a 5800 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3b49e2e9
PNA		 5801 }
5802
5803 if (!nla[NFTA_FLOWTABLE_NAME])
5804 return -EINVAL;
5805
cac20fcd
PNA		 5806 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5807 genmask);
3b49e2e9
PNA		 5808 if (IS_ERR(table))
5809 return PTR_ERR(table);
5810
cac20fcd
PNA		 5811 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5812 genmask);
03a0120f 5813 if (IS_ERR(flowtable))
3b49e2e9
PNA		 5814 return PTR_ERR(flowtable);
5815
d9adf22a 5816 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3b49e2e9
PNA		 5817 if (!skb2)
5818 return -ENOMEM;
5819
5820 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
5821 nlh->nlmsg_seq,
5822 NFT_MSG_NEWFLOWTABLE, 0, family,
5823 flowtable);
5824 if (err < 0)
5825 goto err;
5826
5827 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5828err:
5829 kfree_skb(skb2);
5830 return err;
5831}
5832
5833static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
5834 struct nft_flowtable *flowtable,
5835 int event)
5836{
5837 struct sk_buff *skb;
5838 int err;
5839
5840 if (ctx->report &&
5841 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
5842 return;
5843
5844 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5845 if (skb == NULL)
5846 goto err;
5847
5848 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
5849 ctx->seq, event, 0,
36596dad 5850 ctx->family, flowtable);
3b49e2e9
PNA		 5851 if (err < 0) {
5852 kfree_skb(skb);
5853 goto err;
5854 }
5855
5856 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
5857 ctx->report, GFP_KERNEL);
5858 return;
5859err:
5860 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
5861}
5862
3b49e2e9
PNA		 5863static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
5864{
c04a3f73 5865 kfree(flowtable->ops);
3b49e2e9 5866 kfree(flowtable->name);
b408c5b0 5867 flowtable->data.type->free(&flowtable->data);
3b49e2e9 5868 module_put(flowtable->data.type->owner);
a12486eb 5869 kfree(flowtable);
3b49e2e9
PNA		 5870}
5871
84d7fce6
PNA		 5872static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
5873 u32 portid, u32 seq)
5874{
5875 struct nlmsghdr *nlh;
5876 struct nfgenmsg *nfmsg;
784b4e61 5877 char buf[TASK_COMM_LEN];
dedb67c4 5878 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
84d7fce6
PNA		 5879
5880 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
5881 if (nlh == NULL)
5882 goto nla_put_failure;
5883
5884 nfmsg = nlmsg_data(nlh);
5885 nfmsg->nfgen_family = AF_UNSPEC;
5886 nfmsg->version = NFNETLINK_V0;
5887 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5888
784b4e61
PS		 5889 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
5890 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
5891 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
84d7fce6
PNA		 5892 goto nla_put_failure;
5893
053c095a
JB		 5894 nlmsg_end(skb, nlh);
5895 return 0;
84d7fce6
PNA		 5896
5897nla_put_failure:
5898 nlmsg_trim(skb, nlh);
5899 return -EMSGSIZE;
5900}
5901
3b49e2e9
PNA		 5902static void nft_flowtable_event(unsigned long event, struct net_device *dev,
5903 struct nft_flowtable *flowtable)
5904{
5905 int i;
5906
5907 for (i = 0; i < flowtable->ops_len; i++) {
5908 if (flowtable->ops[i].dev != dev)
5909 continue;
5910
5911 nf_unregister_net_hook(dev_net(dev), &flowtable->ops[i]);
5912 flowtable->ops[i].dev = NULL;
5913 break;
5914 }
5915}
5916
5917static int nf_tables_flowtable_event(struct notifier_block *this,
5918 unsigned long event, void *ptr)
5919{
5920 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
5921 struct nft_flowtable *flowtable;
5922 struct nft_table *table;
0a2cf5ee 5923 struct net *net;
3b49e2e9
PNA		 5924
5925 if (event != NETDEV_UNREGISTER)
5926 return 0;
5927
0a2cf5ee
FW		 5928 net = maybe_get_net(dev_net(dev));
5929 if (!net)
5930 return 0;
5931
9e619d87 5932 mutex_lock(&net->nft.commit_mutex);
0a2cf5ee 5933 list_for_each_entry(table, &net->nft.tables, list) {
36596dad
PNA		 5934 list_for_each_entry(flowtable, &table->flowtables, list) {
5935 nft_flowtable_event(event, dev, flowtable);
3b49e2e9
PNA		 5936 }
5937 }
9e619d87 5938 mutex_unlock(&net->nft.commit_mutex);
0a2cf5ee 5939 put_net(net);
3b49e2e9
PNA		 5940 return NOTIFY_DONE;
5941}
5942
5943static struct notifier_block nf_tables_flowtable_notifier = {
5944 .notifier_call = nf_tables_flowtable_event,
5945};
5946
25e94a99
PNA		 5947static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
5948 int event)
84d7fce6
PNA		 5949{
5950 struct nlmsghdr *nlh = nlmsg_hdr(skb);
5951 struct sk_buff *skb2;
5952 int err;
5953
5954 if (nlmsg_report(nlh) &&
5955 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 5956 return;
84d7fce6 5957
84d7fce6
PNA		 5958 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5959 if (skb2 == NULL)
5960 goto err;
5961
5962 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
5963 nlh->nlmsg_seq);
5964 if (err < 0) {
5965 kfree_skb(skb2);
5966 goto err;
5967 }
5968
25e94a99
PNA		 5969 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
5970 nlmsg_report(nlh), GFP_KERNEL);
5971 return;
84d7fce6 5972err:
25e94a99
PNA		 5973 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
5974 -ENOBUFS);
84d7fce6
PNA		 5975}
5976
7b8002a1
PNA		 5977static int nf_tables_getgen(struct net *net, struct sock *nlsk,
5978 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 5979 const struct nlattr * const nla[],
5980 struct netlink_ext_ack *extack)
84d7fce6 5981{
84d7fce6
PNA		 5982 struct sk_buff *skb2;
5983 int err;
5984
d9adf22a 5985 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
84d7fce6
PNA		 5986 if (skb2 == NULL)
5987 return -ENOMEM;
5988
5989 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
5990 nlh->nlmsg_seq);
5991 if (err < 0)
5992 goto err;
5993
5994 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5995err:
5996 kfree_skb(skb2);
5997 return err;
5998}
5999
96518518
PM		 6000static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
6001 [NFT_MSG_NEWTABLE] = {
55dd6f93 6002 .call_batch = nf_tables_newtable,
96518518
PM		 6003 .attr_count = NFTA_TABLE_MAX,
6004 .policy = nft_table_policy,
6005 },
6006 [NFT_MSG_GETTABLE] = {
d9adf22a 6007 .call_rcu = nf_tables_gettable,
96518518
PM		 6008 .attr_count = NFTA_TABLE_MAX,
6009 .policy = nft_table_policy,
6010 },
6011 [NFT_MSG_DELTABLE] = {
55dd6f93 6012 .call_batch = nf_tables_deltable,
96518518
PM		 6013 .attr_count = NFTA_TABLE_MAX,
6014 .policy = nft_table_policy,
6015 },
6016 [NFT_MSG_NEWCHAIN] = {
91c7b38d 6017 .call_batch = nf_tables_newchain,
96518518
PM		 6018 .attr_count = NFTA_CHAIN_MAX,
6019 .policy = nft_chain_policy,
6020 },
6021 [NFT_MSG_GETCHAIN] = {
d9adf22a 6022 .call_rcu = nf_tables_getchain,
96518518
PM		 6023 .attr_count = NFTA_CHAIN_MAX,
6024 .policy = nft_chain_policy,
6025 },
6026 [NFT_MSG_DELCHAIN] = {
91c7b38d 6027 .call_batch = nf_tables_delchain,
96518518
PM		 6028 .attr_count = NFTA_CHAIN_MAX,
6029 .policy = nft_chain_policy,
6030 },
6031 [NFT_MSG_NEWRULE] = {
0628b123 6032 .call_batch = nf_tables_newrule,
96518518
PM		 6033 .attr_count = NFTA_RULE_MAX,
6034 .policy = nft_rule_policy,
6035 },
6036 [NFT_MSG_GETRULE] = {
d9adf22a 6037 .call_rcu = nf_tables_getrule,
96518518
PM		 6038 .attr_count = NFTA_RULE_MAX,
6039 .policy = nft_rule_policy,
6040 },
6041 [NFT_MSG_DELRULE] = {
0628b123 6042 .call_batch = nf_tables_delrule,
96518518
PM		 6043 .attr_count = NFTA_RULE_MAX,
6044 .policy = nft_rule_policy,
6045 },
20a69341 6046 [NFT_MSG_NEWSET] = {
958bee14 6047 .call_batch = nf_tables_newset,
20a69341
PM		 6048 .attr_count = NFTA_SET_MAX,
6049 .policy = nft_set_policy,
6050 },
6051 [NFT_MSG_GETSET] = {
d9adf22a 6052 .call_rcu = nf_tables_getset,
20a69341
PM		 6053 .attr_count = NFTA_SET_MAX,
6054 .policy = nft_set_policy,
6055 },
6056 [NFT_MSG_DELSET] = {
958bee14 6057 .call_batch = nf_tables_delset,
20a69341
PM		 6058 .attr_count = NFTA_SET_MAX,
6059 .policy = nft_set_policy,
6060 },
6061 [NFT_MSG_NEWSETELEM] = {
958bee14 6062 .call_batch = nf_tables_newsetelem,
20a69341
PM		 6063 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6064 .policy = nft_set_elem_list_policy,
6065 },
6066 [NFT_MSG_GETSETELEM] = {
d9adf22a 6067 .call_rcu = nf_tables_getsetelem,
20a69341
PM		 6068 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6069 .policy = nft_set_elem_list_policy,
6070 },
6071 [NFT_MSG_DELSETELEM] = {
958bee14 6072 .call_batch = nf_tables_delsetelem,
20a69341
PM		 6073 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6074 .policy = nft_set_elem_list_policy,
6075 },
84d7fce6 6076 [NFT_MSG_GETGEN] = {
d9adf22a 6077 .call_rcu = nf_tables_getgen,
84d7fce6 6078 },
e5009240
PNA		 6079 [NFT_MSG_NEWOBJ] = {
6080 .call_batch = nf_tables_newobj,
6081 .attr_count = NFTA_OBJ_MAX,
6082 .policy = nft_obj_policy,
6083 },
6084 [NFT_MSG_GETOBJ] = {
d9adf22a 6085 .call_rcu = nf_tables_getobj,
e5009240
PNA		 6086 .attr_count = NFTA_OBJ_MAX,
6087 .policy = nft_obj_policy,
6088 },
6089 [NFT_MSG_DELOBJ] = {
6090 .call_batch = nf_tables_delobj,
6091 .attr_count = NFTA_OBJ_MAX,
6092 .policy = nft_obj_policy,
6093 },
43da04a5 6094 [NFT_MSG_GETOBJ_RESET] = {
d9adf22a 6095 .call_rcu = nf_tables_getobj,
43da04a5
PNA		 6096 .attr_count = NFTA_OBJ_MAX,
6097 .policy = nft_obj_policy,
6098 },
3b49e2e9
PNA		 6099 [NFT_MSG_NEWFLOWTABLE] = {
6100 .call_batch = nf_tables_newflowtable,
6101 .attr_count = NFTA_FLOWTABLE_MAX,
6102 .policy = nft_flowtable_policy,
6103 },
6104 [NFT_MSG_GETFLOWTABLE] = {
d9adf22a 6105 .call_rcu = nf_tables_getflowtable,
3b49e2e9
PNA		 6106 .attr_count = NFTA_FLOWTABLE_MAX,
6107 .policy = nft_flowtable_policy,
6108 },
6109 [NFT_MSG_DELFLOWTABLE] = {
6110 .call_batch = nf_tables_delflowtable,
6111 .attr_count = NFTA_FLOWTABLE_MAX,
6112 .policy = nft_flowtable_policy,
6113 },
96518518
PM		 6114};
6115
a654de8f
PNA		 6116static int nf_tables_validate(struct net *net)
6117{
6118 struct nft_table *table;
6119
6120 switch (net->nft.validate_state) {
6121 case NFT_VALIDATE_SKIP:
6122 break;
6123 case NFT_VALIDATE_NEED:
6124 nft_validate_state_update(net, NFT_VALIDATE_DO);
6125 /* fall through */
6126 case NFT_VALIDATE_DO:
6127 list_for_each_entry(table, &net->nft.tables, list) {
6128 if (nft_table_validate(net, table) < 0)
6129 return -EAGAIN;
6130 }
6131 break;
6132 }
6133
6134 return 0;
6135}
6136
91c7b38d
PNA		 6137static void nft_chain_commit_update(struct nft_trans *trans)
6138{
6139 struct nft_base_chain *basechain;
6140
1b2470e5
FW		 6141 if (nft_trans_chain_name(trans)) {
6142 rhltable_remove(&trans->ctx.table->chains_ht,
6143 &trans->ctx.chain->rhlhead,
6144 nft_chain_ht_params);
d71efb59 6145 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
1b2470e5
FW		 6146 rhltable_insert_key(&trans->ctx.table->chains_ht,
6147 trans->ctx.chain->name,
6148 &trans->ctx.chain->rhlhead,
6149 nft_chain_ht_params);
6150 }
91c7b38d 6151
f323d954 6152 if (!nft_is_base_chain(trans->ctx.chain))
91c7b38d
PNA		 6153 return;
6154
6155 basechain = nft_base_chain(trans->ctx.chain);
6156 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
6157
6158 switch (nft_trans_chain_policy(trans)) {
6159 case NF_DROP:
6160 case NF_ACCEPT:
6161 basechain->policy = nft_trans_chain_policy(trans);
6162 break;
6163 }
6164}
6165
2f99aa31 6166static void nft_commit_release(struct nft_trans *trans)
c7c32e72 6167{
c7c32e72
PNA		 6168 switch (trans->msg_type) {
6169 case NFT_MSG_DELTABLE:
6170 nf_tables_table_destroy(&trans->ctx);
6171 break;
9f8aac0b
FW		 6172 case NFT_MSG_NEWCHAIN:
6173 kfree(nft_trans_chain_name(trans));
6174 break;
c7c32e72 6175 case NFT_MSG_DELCHAIN:
43a605f2 6176 nf_tables_chain_destroy(&trans->ctx);
c7c32e72
PNA		 6177 break;
6178 case NFT_MSG_DELRULE:
6179 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6180 break;
6181 case NFT_MSG_DELSET:
6182 nft_set_destroy(nft_trans_set(trans));
6183 break;
61edafbb 6184 case NFT_MSG_DELSETELEM:
3453c927
PNA		 6185 nf_tables_set_elem_destroy(&trans->ctx,
6186 nft_trans_elem_set(trans),
59105446 6187 nft_trans_elem(trans).priv);
61edafbb 6188 break;
e5009240 6189 case NFT_MSG_DELOBJ:
00bfb320 6190 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
e5009240 6191 break;
3b49e2e9
PNA		 6192 case NFT_MSG_DELFLOWTABLE:
6193 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6194 break;
c7c32e72
PNA		 6195 }
6196 kfree(trans);
6197}
6198
2f99aa31
FW		 6199static void nf_tables_commit_release(struct net *net)
6200{
6201 struct nft_trans *trans, *next;
6202
6203 if (list_empty(&net->nft.commit_list))
6204 return;
6205
6206 synchronize_rcu();
6207
6208 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6209 list_del(&trans->list);
6210 nft_commit_release(trans);
6211 }
6212}
6213
0cbc06b3
FW		 6214static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
6215{
6216 struct nft_rule *rule;
6217 unsigned int alloc = 0;
6218 int i;
6219
6220 /* already handled or inactive chain? */
6221 if (chain->rules_next || !nft_is_active_next(net, chain))
6222 return 0;
6223
6224 rule = list_entry(&chain->rules, struct nft_rule, list);
6225 i = 0;
6226
6227 list_for_each_entry_continue(rule, &chain->rules, list) {
6228 if (nft_is_active_next(net, rule))
6229 alloc++;
6230 }
6231
6232 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
6233 if (!chain->rules_next)
6234 return -ENOMEM;
6235
6236 list_for_each_entry_continue(rule, &chain->rules, list) {
6237 if (nft_is_active_next(net, rule))
6238 chain->rules_next[i++] = rule;
6239 }
6240
6241 chain->rules_next[i] = NULL;
6242 return 0;
6243}
6244
6245static void nf_tables_commit_chain_prepare_cancel(struct net *net)
6246{
6247 struct nft_trans *trans, *next;
6248
6249 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6250 struct nft_chain *chain = trans->ctx.chain;
6251
6252 if (trans->msg_type == NFT_MSG_NEWRULE ||
6253 trans->msg_type == NFT_MSG_DELRULE) {
6254 kvfree(chain->rules_next);
6255 chain->rules_next = NULL;
6256 }
6257 }
6258}
6259
6260static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
6261{
6262 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
6263
6264 kvfree(o->start);
6265}
6266
6267static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
6268{
6269 struct nft_rule **r = rules;
6270 struct nft_rules_old *old;
6271
6272 while (*r)
6273 r++;
6274
6275 r++; /* rcu_head is after end marker */
6276 old = (void *) r;
6277 old->start = rules;
6278
6279 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
6280}
6281
6282static void nf_tables_commit_chain_active(struct net *net, struct nft_chain *chain)
6283{
6284 struct nft_rule **g0, **g1;
6285 bool next_genbit;
6286
6287 next_genbit = nft_gencursor_next(net);
6288
6289 g0 = rcu_dereference_protected(chain->rules_gen_0,
f102d66b 6290 lockdep_commit_lock_is_held(net));
0cbc06b3 6291 g1 = rcu_dereference_protected(chain->rules_gen_1,
f102d66b 6292 lockdep_commit_lock_is_held(net));
0cbc06b3
FW		 6293
6294 /* No changes to this chain? */
6295 if (chain->rules_next == NULL) {
6296 /* chain had no change in last or next generation */
6297 if (g0 == g1)
6298 return;
6299 /*
6300 * chain had no change in this generation; make sure next
6301 * one uses same rules as current generation.
6302 */
6303 if (next_genbit) {
6304 rcu_assign_pointer(chain->rules_gen_1, g0);
6305 nf_tables_commit_chain_free_rules_old(g1);
6306 } else {
6307 rcu_assign_pointer(chain->rules_gen_0, g1);
6308 nf_tables_commit_chain_free_rules_old(g0);
6309 }
6310
6311 return;
6312 }
6313
6314 if (next_genbit)
6315 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
6316 else
6317 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
6318
6319 chain->rules_next = NULL;
6320
6321 if (g0 == g1)
6322 return;
6323
6324 if (next_genbit)
6325 nf_tables_commit_chain_free_rules_old(g1);
6326 else
6327 nf_tables_commit_chain_free_rules_old(g0);
6328}
6329
1b2470e5
FW		 6330static void nft_chain_del(struct nft_chain *chain)
6331{
6332 struct nft_table *table = chain->table;
6333
6334 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
6335 nft_chain_ht_params));
6336 list_del_rcu(&chain->list);
6337}
6338
5913beaf 6339static int nf_tables_commit(struct net *net, struct sk_buff *skb)
37082f93 6340{
37082f93 6341 struct nft_trans *trans, *next;
a3716e70 6342 struct nft_trans_elem *te;
0cbc06b3
FW		 6343 struct nft_chain *chain;
6344 struct nft_table *table;
37082f93 6345
a654de8f
PNA		 6346 /* 0. Validate ruleset, otherwise roll back for error reporting. */
6347 if (nf_tables_validate(net) < 0)
6348 return -EAGAIN;
6349
0cbc06b3
FW		 6350 /* 1. Allocate space for next generation rules_gen_X[] */
6351 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6352 int ret;
37082f93 6353
0cbc06b3
FW		 6354 if (trans->msg_type == NFT_MSG_NEWRULE ||
6355 trans->msg_type == NFT_MSG_DELRULE) {
6356 chain = trans->ctx.chain;
6357
6358 ret = nf_tables_commit_chain_prepare(net, chain);
6359 if (ret < 0) {
6360 nf_tables_commit_chain_prepare_cancel(net);
6361 return ret;
6362 }
6363 }
6364 }
37082f93 6365
0cbc06b3
FW		 6366 /* step 2. Make rules_gen_X visible to packet path */
6367 list_for_each_entry(table, &net->nft.tables, list) {
6368 list_for_each_entry(chain, &table->chains, list) {
6369 if (!nft_is_active_next(net, chain))
6370 continue;
6371 nf_tables_commit_chain_active(net, chain);
6372 }
6373 }
6374
6375 /*
6376 * Bump generation counter, invalidate any dump in progress.
6377 * Cannot fail after this point.
37082f93 6378 */
0cbc06b3
FW		 6379 while (++net->nft.base_seq == 0);
6380
6381 /* step 3. Start new generation, rules_gen_X now in use. */
6382 net->nft.gencursor = nft_gencursor_next(net);
37082f93
PNA		 6383
6384 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
b380e5c7 6385 switch (trans->msg_type) {
55dd6f93
PNA		 6386 case NFT_MSG_NEWTABLE:
6387 if (nft_trans_table_update(trans)) {
6388 if (!nft_trans_table_enable(trans)) {
664b0f8c 6389 nf_tables_table_disable(net,
55dd6f93
PNA		 6390 trans->ctx.table);
6391 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6392 }
6393 } else {
f2a6d766 6394 nft_clear(net, trans->ctx.table);
55dd6f93 6395 }
35151d84 6396 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
55dd6f93
PNA		 6397 nft_trans_destroy(trans);
6398 break;
6399 case NFT_MSG_DELTABLE:
f2a6d766 6400 list_del_rcu(&trans->ctx.table->list);
35151d84 6401 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
55dd6f93 6402 break;
91c7b38d 6403 case NFT_MSG_NEWCHAIN:
9f8aac0b 6404 if (nft_trans_chain_update(trans)) {
91c7b38d 6405 nft_chain_commit_update(trans);
9f8aac0b
FW		 6406 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6407 /* trans destroyed after rcu grace period */
6408 } else {
664b0f8c 6409 nft_clear(net, trans->ctx.chain);
9f8aac0b
FW		 6410 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6411 nft_trans_destroy(trans);
6412 }
91c7b38d
PNA		 6413 break;
6414 case NFT_MSG_DELCHAIN:
1b2470e5 6415 nft_chain_del(trans->ctx.chain);
35151d84 6416 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
c974a3a3
PNA		 6417 nf_tables_unregister_hook(trans->ctx.net,
6418 trans->ctx.table,
6419 trans->ctx.chain);
91c7b38d 6420 break;
b380e5c7 6421 case NFT_MSG_NEWRULE:
889f7ee7 6422 nft_clear(trans->ctx.net, nft_trans_rule(trans));
35151d84 6423 nf_tables_rule_notify(&trans->ctx,
37082f93 6424 nft_trans_rule(trans),
35151d84 6425 NFT_MSG_NEWRULE);
37082f93 6426 nft_trans_destroy(trans);
b380e5c7
PNA		 6427 break;
6428 case NFT_MSG_DELRULE:
6429 list_del_rcu(&nft_trans_rule(trans)->list);
35151d84
PNA		 6430 nf_tables_rule_notify(&trans->ctx,
6431 nft_trans_rule(trans),
6432 NFT_MSG_DELRULE);
b380e5c7 6433 break;
958bee14 6434 case NFT_MSG_NEWSET:
37a9cc52 6435 nft_clear(net, nft_trans_set(trans));
4fefee57
PNA		 6436 /* This avoids hitting -EBUSY when deleting the table
6437 * from the transaction.
6438 */
408070d6 6439 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
4fefee57
PNA		 6440 !list_empty(&nft_trans_set(trans)->bindings))
6441 trans->ctx.table->use--;
6442
958bee14 6443 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 6444 NFT_MSG_NEWSET, GFP_KERNEL);
958bee14
PNA		 6445 nft_trans_destroy(trans);
6446 break;
6447 case NFT_MSG_DELSET:
37a9cc52 6448 list_del_rcu(&nft_trans_set(trans)->list);
958bee14 6449 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 6450 NFT_MSG_DELSET, GFP_KERNEL);
958bee14 6451 break;
60319eb1 6452 case NFT_MSG_NEWSETELEM:
cc02e457
PM		 6453 te = (struct nft_trans_elem *)trans->data;
6454
42a55769 6455 te->set->ops->activate(net, te->set, &te->elem);
cc02e457
PM		 6456 nf_tables_setelem_notify(&trans->ctx, te->set,
6457 &te->elem,
60319eb1
PNA		 6458 NFT_MSG_NEWSETELEM, 0);
6459 nft_trans_destroy(trans);
6460 break;
6461 case NFT_MSG_DELSETELEM:
a3716e70 6462 te = (struct nft_trans_elem *)trans->data;
fe2811eb 6463
a3716e70
PNA		 6464 nf_tables_setelem_notify(&trans->ctx, te->set,
6465 &te->elem,
60319eb1 6466 NFT_MSG_DELSETELEM, 0);
5cb82a38 6467 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a
PM		 6468 atomic_dec(&te->set->nelems);
6469 te->set->ndeact--;
60319eb1 6470 break;
e5009240
PNA		 6471 case NFT_MSG_NEWOBJ:
6472 nft_clear(net, nft_trans_obj(trans));
6473 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6474 NFT_MSG_NEWOBJ);
6475 nft_trans_destroy(trans);
6476 break;
6477 case NFT_MSG_DELOBJ:
6478 list_del_rcu(&nft_trans_obj(trans)->list);
6479 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6480 NFT_MSG_DELOBJ);
6481 break;
3b49e2e9
PNA		 6482 case NFT_MSG_NEWFLOWTABLE:
6483 nft_clear(net, nft_trans_flowtable(trans));
6484 nf_tables_flowtable_notify(&trans->ctx,
6485 nft_trans_flowtable(trans),
6486 NFT_MSG_NEWFLOWTABLE);
6487 nft_trans_destroy(trans);
6488 break;
6489 case NFT_MSG_DELFLOWTABLE:
6490 list_del_rcu(&nft_trans_flowtable(trans)->list);
6491 nf_tables_flowtable_notify(&trans->ctx,
6492 nft_trans_flowtable(trans),
6493 NFT_MSG_DELFLOWTABLE);
6494 nft_unregister_flowtable_net_hooks(net,
6495 nft_trans_flowtable(trans));
6496 break;
37082f93 6497 }
37082f93
PNA		 6498 }
6499
2f99aa31 6500 nf_tables_commit_release(net);
84d7fce6 6501 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
f102d66b 6502 mutex_unlock(&net->nft.commit_mutex);
37082f93
PNA		 6503
6504 return 0;
6505}
6506
b326dd37 6507static void nf_tables_abort_release(struct nft_trans *trans)
c7c32e72 6508{
c7c32e72
PNA		 6509 switch (trans->msg_type) {
6510 case NFT_MSG_NEWTABLE:
6511 nf_tables_table_destroy(&trans->ctx);
6512 break;
6513 case NFT_MSG_NEWCHAIN:
43a605f2 6514 nf_tables_chain_destroy(&trans->ctx);
c7c32e72
PNA		 6515 break;
6516 case NFT_MSG_NEWRULE:
6517 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6518 break;
6519 case NFT_MSG_NEWSET:
6520 nft_set_destroy(nft_trans_set(trans));
6521 break;
61edafbb
PM		 6522 case NFT_MSG_NEWSETELEM:
6523 nft_set_elem_destroy(nft_trans_elem_set(trans),
61f9e292 6524 nft_trans_elem(trans).priv, true);
61edafbb 6525 break;
e5009240 6526 case NFT_MSG_NEWOBJ:
00bfb320 6527 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
e5009240 6528 break;
3b49e2e9
PNA		 6529 case NFT_MSG_NEWFLOWTABLE:
6530 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6531 break;
c7c32e72
PNA		 6532 }
6533 kfree(trans);
6534}
6535
71ad00c5 6536static int __nf_tables_abort(struct net *net)
37082f93 6537{
37082f93 6538 struct nft_trans *trans, *next;
02263db0 6539 struct nft_trans_elem *te;
37082f93 6540
a907e36d
XL		 6541 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
6542 list) {
b380e5c7 6543 switch (trans->msg_type) {
55dd6f93
PNA		 6544 case NFT_MSG_NEWTABLE:
6545 if (nft_trans_table_update(trans)) {
6546 if (nft_trans_table_enable(trans)) {
664b0f8c 6547 nf_tables_table_disable(net,
55dd6f93
PNA		 6548 trans->ctx.table);
6549 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6550 }
6551 nft_trans_destroy(trans);
6552 } else {
e688a7f8 6553 list_del_rcu(&trans->ctx.table->list);
55dd6f93
PNA		 6554 }
6555 break;
6556 case NFT_MSG_DELTABLE:
f2a6d766 6557 nft_clear(trans->ctx.net, trans->ctx.table);
55dd6f93
PNA		 6558 nft_trans_destroy(trans);
6559 break;
91c7b38d
PNA		 6560 case NFT_MSG_NEWCHAIN:
6561 if (nft_trans_chain_update(trans)) {
982f4051 6562 free_percpu(nft_trans_chain_stats(trans));
9f8aac0b 6563 kfree(nft_trans_chain_name(trans));
91c7b38d
PNA		 6564 nft_trans_destroy(trans);
6565 } else {
4fefee57 6566 trans->ctx.table->use--;
1b2470e5 6567 nft_chain_del(trans->ctx.chain);
c974a3a3
PNA		 6568 nf_tables_unregister_hook(trans->ctx.net,
6569 trans->ctx.table,
6570 trans->ctx.chain);
91c7b38d
PNA		 6571 }
6572 break;
6573 case NFT_MSG_DELCHAIN:
4fefee57 6574 trans->ctx.table->use++;
664b0f8c 6575 nft_clear(trans->ctx.net, trans->ctx.chain);
91c7b38d
PNA		 6576 nft_trans_destroy(trans);
6577 break;
b380e5c7 6578 case NFT_MSG_NEWRULE:
4fefee57 6579 trans->ctx.chain->use--;
b380e5c7 6580 list_del_rcu(&nft_trans_rule(trans)->list);
bb7b40ae 6581 nft_rule_expr_deactivate(&trans->ctx, nft_trans_rule(trans));
b380e5c7
PNA		 6582 break;
6583 case NFT_MSG_DELRULE:
4fefee57 6584 trans->ctx.chain->use++;
889f7ee7 6585 nft_clear(trans->ctx.net, nft_trans_rule(trans));
bb7b40ae 6586 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
37082f93 6587 nft_trans_destroy(trans);
b380e5c7 6588 break;
958bee14 6589 case NFT_MSG_NEWSET:
4fefee57 6590 trans->ctx.table->use--;
e688a7f8 6591 list_del_rcu(&nft_trans_set(trans)->list);
958bee14
PNA		 6592 break;
6593 case NFT_MSG_DELSET:
4fefee57 6594 trans->ctx.table->use++;
37a9cc52 6595 nft_clear(trans->ctx.net, nft_trans_set(trans));
958bee14
PNA		 6596 nft_trans_destroy(trans);
6597 break;
60319eb1 6598 case NFT_MSG_NEWSETELEM:
02263db0 6599 te = (struct nft_trans_elem *)trans->data;
fe2811eb 6600
5cb82a38 6601 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a 6602 atomic_dec(&te->set->nelems);
60319eb1
PNA		 6603 break;
6604 case NFT_MSG_DELSETELEM:
cc02e457
PM		 6605 te = (struct nft_trans_elem *)trans->data;
6606
59105446 6607 nft_set_elem_activate(net, te->set, &te->elem);
42a55769 6608 te->set->ops->activate(net, te->set, &te->elem);
3dd0673a 6609 te->set->ndeact--;
cc02e457 6610
e5009240
PNA		 6611 nft_trans_destroy(trans);
6612 break;
6613 case NFT_MSG_NEWOBJ:
6614 trans->ctx.table->use--;
6615 list_del_rcu(&nft_trans_obj(trans)->list);
6616 break;
6617 case NFT_MSG_DELOBJ:
6618 trans->ctx.table->use++;
6619 nft_clear(trans->ctx.net, nft_trans_obj(trans));
60319eb1
PNA		 6620 nft_trans_destroy(trans);
6621 break;
3b49e2e9
PNA		 6622 case NFT_MSG_NEWFLOWTABLE:
6623 trans->ctx.table->use--;
6624 list_del_rcu(&nft_trans_flowtable(trans)->list);
6625 nft_unregister_flowtable_net_hooks(net,
6626 nft_trans_flowtable(trans));
6627 break;
6628 case NFT_MSG_DELFLOWTABLE:
6629 trans->ctx.table->use++;
6630 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
6631 nft_trans_destroy(trans);
6632 break;
37082f93 6633 }
37082f93
PNA		 6634 }
6635
b326dd37
PNA		 6636 synchronize_rcu();
6637
a1cee076
PNA		 6638 list_for_each_entry_safe_reverse(trans, next,
6639 &net->nft.commit_list, list) {
c7c32e72 6640 list_del(&trans->list);
b326dd37 6641 nf_tables_abort_release(trans);
37082f93
PNA		 6642 }
6643
6644 return 0;
6645}
6646
a654de8f
PNA		 6647static void nf_tables_cleanup(struct net *net)
6648{
6649 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
6650}
6651
71ad00c5
FW		 6652static int nf_tables_abort(struct net *net, struct sk_buff *skb)
6653{
f102d66b
FW		 6654 int ret = __nf_tables_abort(net);
6655
6656 mutex_unlock(&net->nft.commit_mutex);
6657
6658 return ret;
71ad00c5
FW		 6659}
6660
74e8bcd2
PNA		 6661static bool nf_tables_valid_genid(struct net *net, u32 genid)
6662{
f102d66b
FW		 6663 bool genid_ok;
6664
6665 mutex_lock(&net->nft.commit_mutex);
6666
6667 genid_ok = genid == 0 || net->nft.base_seq == genid;
6668 if (!genid_ok)
6669 mutex_unlock(&net->nft.commit_mutex);
6670
6671 /* else, commit mutex has to be released by commit or abort function */
6672 return genid_ok;
74e8bcd2
PNA		 6673}
6674
96518518
PM		 6675static const struct nfnetlink_subsystem nf_tables_subsys = {
6676 .name = "nf_tables",
6677 .subsys_id = NFNL_SUBSYS_NFTABLES,
6678 .cb_count = NFT_MSG_MAX,
6679 .cb = nf_tables_cb,
0628b123
PNA		 6680 .commit = nf_tables_commit,
6681 .abort = nf_tables_abort,
a654de8f 6682 .cleanup = nf_tables_cleanup,
74e8bcd2 6683 .valid_genid = nf_tables_valid_genid,
be2ab5b4 6684 .owner = THIS_MODULE,
96518518
PM		 6685};
6686
7210e4e3 6687int nft_chain_validate_dependency(const struct nft_chain *chain,
32537e91 6688 enum nft_chain_types type)
7210e4e3
PNA		 6689{
6690 const struct nft_base_chain *basechain;
6691
f323d954 6692 if (nft_is_base_chain(chain)) {
7210e4e3
PNA		 6693 basechain = nft_base_chain(chain);
6694 if (basechain->type->type != type)
6695 return -EOPNOTSUPP;
6696 }
6697 return 0;
6698}
6699EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
6700
75e8d06d
PNA		 6701int nft_chain_validate_hooks(const struct nft_chain *chain,
6702 unsigned int hook_flags)
6703{
6704 struct nft_base_chain *basechain;
6705
f323d954 6706 if (nft_is_base_chain(chain)) {
75e8d06d
PNA		 6707 basechain = nft_base_chain(chain);
6708
c974a3a3 6709 if ((1 << basechain->ops.hooknum) & hook_flags)
75e8d06d
PNA		 6710 return 0;
6711
6712 return -EOPNOTSUPP;
6713 }
6714
6715 return 0;
6716}
6717EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
6718
20a69341
PM		 6719/*
6720 * Loop detection - walk through the ruleset beginning at the destination chain
6721 * of a new jump until either the source chain is reached (loop) or all
6722 * reachable chains have been traversed.
6723 *
6724 * The loop check is performed whenever a new jump verdict is added to an
6725 * expression or verdict map or a verdict map is bound to a new chain.
6726 */
6727
6728static int nf_tables_check_loops(const struct nft_ctx *ctx,
6729 const struct nft_chain *chain);
6730
6731static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
de70185d 6732 struct nft_set *set,
20a69341 6733 const struct nft_set_iter *iter,
de70185d 6734 struct nft_set_elem *elem)
20a69341 6735{
fe2811eb
PM		 6736 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6737 const struct nft_data *data;
6738
6739 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6740 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
62f9c8b4
PNA		 6741 return 0;
6742
fe2811eb 6743 data = nft_set_ext_data(ext);
1ca2e170 6744 switch (data->verdict.code) {
20a69341
PM		 6745 case NFT_JUMP:
6746 case NFT_GOTO:
1ca2e170 6747 return nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 6748 default:
6749 return 0;
6750 }
6751}
6752
6753static int nf_tables_check_loops(const struct nft_ctx *ctx,
6754 const struct nft_chain *chain)
6755{
6756 const struct nft_rule *rule;
6757 const struct nft_expr *expr, *last;
de70185d 6758 struct nft_set *set;
20a69341
PM		 6759 struct nft_set_binding *binding;
6760 struct nft_set_iter iter;
20a69341
PM		 6761
6762 if (ctx->chain == chain)
6763 return -ELOOP;
6764
6765 list_for_each_entry(rule, &chain->rules, list) {
6766 nft_rule_for_each_expr(expr, last, rule) {
a654de8f
PNA		 6767 struct nft_immediate_expr *priv;
6768 const struct nft_data *data;
0ca743a5
PNA		 6769 int err;
6770
a654de8f 6771 if (strcmp(expr->ops->type->name, "immediate"))
20a69341
PM		 6772 continue;
6773
a654de8f
PNA		 6774 priv = nft_expr_priv(expr);
6775 if (priv->dreg != NFT_REG_VERDICT)
0ca743a5 6776 continue;
20a69341 6777
a654de8f 6778 data = &priv->data;
1ca2e170 6779 switch (data->verdict.code) {
20a69341
PM		 6780 case NFT_JUMP:
6781 case NFT_GOTO:
1ca2e170
PM		 6782 err = nf_tables_check_loops(ctx,
6783 data->verdict.chain);
20a69341
PM		 6784 if (err < 0)
6785 return err;
6786 default:
6787 break;
6788 }
6789 }
6790 }
6791
6792 list_for_each_entry(set, &ctx->table->sets, list) {
37a9cc52
PNA		 6793 if (!nft_is_active_next(ctx->net, set))
6794 continue;
20a69341
PM		 6795 if (!(set->flags & NFT_SET_MAP) ||
6796 set->dtype != NFT_DATA_VERDICT)
6797 continue;
6798
6799 list_for_each_entry(binding, &set->bindings, list) {
11113e19
PM		 6800 if (!(binding->flags & NFT_SET_MAP) ||
6801 binding->chain != chain)
20a69341
PM		 6802 continue;
6803
8588ac09 6804 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 6805 iter.skip = 0;
6806 iter.count = 0;
6807 iter.err = 0;
6808 iter.fn = nf_tables_loop_check_setelem;
6809
6810 set->ops->walk(ctx, set, &iter);
6811 if (iter.err < 0)
6812 return iter.err;
6813 }
6814 }
6815
6816 return 0;
6817}
6818
36b701fa
LGL		 6819/**
6820 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
6821 *
6822 * @attr: netlink attribute to fetch value from
6823 * @max: maximum value to be stored in dest
6824 * @dest: pointer to the variable
6825 *
6826 * Parse, check and store a given u32 netlink attribute into variable.
6827 * This function returns -ERANGE if the value goes over maximum value.
6828 * Otherwise a 0 is returned and the attribute value is stored in the
6829 * destination variable.
6830 */
f1d505bb 6831int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
36b701fa 6832{
09525a09 6833 u32 val;
36b701fa
LGL		 6834
6835 val = ntohl(nla_get_be32(attr));
6836 if (val > max)
6837 return -ERANGE;
6838
6839 *dest = val;
6840 return 0;
6841}
6842EXPORT_SYMBOL_GPL(nft_parse_u32_check);
6843
49499c3e
PM		 6844/**
6845 * nft_parse_register - parse a register value from a netlink attribute
6846 *
6847 * @attr: netlink attribute
6848 *
6849 * Parse and translate a register value from a netlink attribute.
6850 * Registers used to be 128 bit wide, these register numbers will be
6851 * mapped to the corresponding 32 bit register numbers.
6852 */
b1c96ed3
PM		 6853unsigned int nft_parse_register(const struct nlattr *attr)
6854{
49499c3e
PM		 6855 unsigned int reg;
6856
6857 reg = ntohl(nla_get_be32(attr));
6858 switch (reg) {
6859 case NFT_REG_VERDICT...NFT_REG_4:
6860 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
6861 default:
6862 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
6863 }
b1c96ed3
PM		 6864}
6865EXPORT_SYMBOL_GPL(nft_parse_register);
6866
49499c3e
PM		 6867/**
6868 * nft_dump_register - dump a register value to a netlink attribute
6869 *
6870 * @skb: socket buffer
6871 * @attr: attribute number
6872 * @reg: register number
6873 *
6874 * Construct a netlink attribute containing the register number. For
6875 * compatibility reasons, register numbers being a multiple of 4 are
6876 * translated to the corresponding 128 bit register numbers.
6877 */
b1c96ed3
PM		 6878int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
6879{
49499c3e
PM		 6880 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
6881 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
6882 else
6883 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
6884
b1c96ed3
PM		 6885 return nla_put_be32(skb, attr, htonl(reg));
6886}
6887EXPORT_SYMBOL_GPL(nft_dump_register);
6888
96518518 6889/**
d07db988 6890 * nft_validate_register_load - validate a load from a register
96518518
PM		 6891 *
6892 * @reg: the register number
d07db988 6893 * @len: the length of the data
96518518
PM		 6894 *
6895 * Validate that the input register is one of the general purpose
d07db988 6896 * registers and that the length of the load is within the bounds.
96518518 6897 */
d07db988 6898int nft_validate_register_load(enum nft_registers reg, unsigned int len)
96518518 6899{
49499c3e 6900 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
96518518 6901 return -EINVAL;
d07db988
PM		 6902 if (len == 0)
6903 return -EINVAL;
49499c3e 6904 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
d07db988 6905 return -ERANGE;
49499c3e 6906
96518518
PM		 6907 return 0;
6908}
d07db988 6909EXPORT_SYMBOL_GPL(nft_validate_register_load);
96518518 6910
96518518 6911/**
1ec10212 6912 * nft_validate_register_store - validate an expressions' register store
96518518
PM		 6913 *
6914 * @ctx: context of the expression performing the load
6915 * @reg: the destination register number
6916 * @data: the data to load
6917 * @type: the data type
45d9bcda 6918 * @len: the length of the data
96518518
PM		 6919 *
6920 * Validate that a data load uses the appropriate data type for
45d9bcda
PM		 6921 * the destination register and the length is within the bounds.
6922 * A value of NULL for the data means that its runtime gathered
58f40ab6 6923 * data.
96518518 6924 */
1ec10212
PM		 6925int nft_validate_register_store(const struct nft_ctx *ctx,
6926 enum nft_registers reg,
6927 const struct nft_data *data,
6928 enum nft_data_types type, unsigned int len)
96518518 6929{
20a69341
PM		 6930 int err;
6931
96518518
PM		 6932 switch (reg) {
6933 case NFT_REG_VERDICT:
58f40ab6 6934 if (type != NFT_DATA_VERDICT)
96518518 6935 return -EINVAL;
20a69341 6936
58f40ab6 6937 if (data != NULL &&
1ca2e170
PM		 6938 (data->verdict.code == NFT_GOTO ||
6939 data->verdict.code == NFT_JUMP)) {
6940 err = nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 6941 if (err < 0)
6942 return err;
20a69341
PM		 6943 }
6944
96518518
PM		 6945 return 0;
6946 default:
49499c3e 6947 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
27e6d201 6948 return -EINVAL;
45d9bcda
PM		 6949 if (len == 0)
6950 return -EINVAL;
49499c3e
PM		 6951 if (reg * NFT_REG32_SIZE + len >
6952 FIELD_SIZEOF(struct nft_regs, data))
45d9bcda 6953 return -ERANGE;
27e6d201 6954
96518518
PM		 6955 if (data != NULL && type != NFT_DATA_VALUE)
6956 return -EINVAL;
6957 return 0;
6958 }
6959}
1ec10212 6960EXPORT_SYMBOL_GPL(nft_validate_register_store);
96518518
PM		 6961
6962static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
6963 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
6964 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
6965 .len = NFT_CHAIN_MAXNAMELEN - 1 },
6966};
6967
6968static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
6969 struct nft_data_desc *desc, const struct nlattr *nla)
6970{
664b0f8c 6971 u8 genmask = nft_genmask_next(ctx->net);
96518518
PM		 6972 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
6973 struct nft_chain *chain;
6974 int err;
6975
fceb6435
JB		 6976 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
6977 NULL);
96518518
PM		 6978 if (err < 0)
6979 return err;
6980
6981 if (!tb[NFTA_VERDICT_CODE])
6982 return -EINVAL;
1ca2e170 6983 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
96518518 6984
1ca2e170 6985 switch (data->verdict.code) {
e0abdadc 6986 default:
1ca2e170 6987 switch (data->verdict.code & NF_VERDICT_MASK) {
e0abdadc
PM		 6988 case NF_ACCEPT:
6989 case NF_DROP:
6990 case NF_QUEUE:
6991 break;
6992 default:
6993 return -EINVAL;
6994 }
6995 /* fall through */
96518518
PM		 6996 case NFT_CONTINUE:
6997 case NFT_BREAK:
6998 case NFT_RETURN:
96518518
PM		 6999 break;
7000 case NFT_JUMP:
7001 case NFT_GOTO:
7002 if (!tb[NFTA_VERDICT_CHAIN])
7003 return -EINVAL;
f102d66b
FW		 7004 chain = nft_chain_lookup(ctx->net, ctx->table,
7005 tb[NFTA_VERDICT_CHAIN], genmask);
96518518
PM		 7006 if (IS_ERR(chain))
7007 return PTR_ERR(chain);
f323d954 7008 if (nft_is_base_chain(chain))
96518518
PM		 7009 return -EOPNOTSUPP;
7010
96518518 7011 chain->use++;
1ca2e170 7012 data->verdict.chain = chain;
96518518 7013 break;
96518518
PM		 7014 }
7015
4c4ed074 7016 desc->len = sizeof(data->verdict);
96518518
PM		 7017 desc->type = NFT_DATA_VERDICT;
7018 return 0;
7019}
7020
7021static void nft_verdict_uninit(const struct nft_data *data)
7022{
1ca2e170 7023 switch (data->verdict.code) {
96518518
PM		 7024 case NFT_JUMP:
7025 case NFT_GOTO:
1ca2e170 7026 data->verdict.chain->use--;
96518518
PM		 7027 break;
7028 }
7029}
7030
33d5a7b1 7031int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
96518518
PM		 7032{
7033 struct nlattr *nest;
7034
33d5a7b1 7035 nest = nla_nest_start(skb, type);
96518518
PM		 7036 if (!nest)
7037 goto nla_put_failure;
7038
33d5a7b1 7039 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
96518518
PM		 7040 goto nla_put_failure;
7041
33d5a7b1 7042 switch (v->code) {
96518518
PM		 7043 case NFT_JUMP:
7044 case NFT_GOTO:
1ca2e170 7045 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
33d5a7b1 7046 v->chain->name))
96518518
PM		 7047 goto nla_put_failure;
7048 }
7049 nla_nest_end(skb, nest);
7050 return 0;
7051
7052nla_put_failure:
7053 return -1;
7054}
7055
d0a11fc3
PM		 7056static int nft_value_init(const struct nft_ctx *ctx,
7057 struct nft_data *data, unsigned int size,
96518518
PM		 7058 struct nft_data_desc *desc, const struct nlattr *nla)
7059{
7060 unsigned int len;
7061
7062 len = nla_len(nla);
7063 if (len == 0)
7064 return -EINVAL;
d0a11fc3 7065 if (len > size)
96518518
PM		 7066 return -EOVERFLOW;
7067
d0a11fc3 7068 nla_memcpy(data->data, nla, len);
96518518
PM		 7069 desc->type = NFT_DATA_VALUE;
7070 desc->len = len;
7071 return 0;
7072}
7073
7074static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
7075 unsigned int len)
7076{
7077 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
7078}
7079
7080static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
d0a11fc3 7081 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
96518518
PM		 7082 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
7083};
7084
7085/**
7086 * nft_data_init - parse nf_tables data netlink attributes
7087 *
7088 * @ctx: context of the expression using the data
7089 * @data: destination struct nft_data
d0a11fc3 7090 * @size: maximum data length
96518518
PM		 7091 * @desc: data description
7092 * @nla: netlink attribute containing data
7093 *
7094 * Parse the netlink data attributes and initialize a struct nft_data.
7095 * The type and length of data are returned in the data description.
7096 *
7097 * The caller can indicate that it only wants to accept data of type
7098 * NFT_DATA_VALUE by passing NULL for the ctx argument.
7099 */
d0a11fc3
PM		 7100int nft_data_init(const struct nft_ctx *ctx,
7101 struct nft_data *data, unsigned int size,
96518518
PM		 7102 struct nft_data_desc *desc, const struct nlattr *nla)
7103{
7104 struct nlattr *tb[NFTA_DATA_MAX + 1];
7105 int err;
7106
fceb6435 7107 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
96518518
PM		 7108 if (err < 0)
7109 return err;
7110
7111 if (tb[NFTA_DATA_VALUE])
d0a11fc3
PM		 7112 return nft_value_init(ctx, data, size, desc,
7113 tb[NFTA_DATA_VALUE]);
96518518
PM		 7114 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
7115 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
7116 return -EINVAL;
7117}
7118EXPORT_SYMBOL_GPL(nft_data_init);
7119
7120/**
59105446 7121 * nft_data_release - release a nft_data item
96518518
PM		 7122 *
7123 * @data: struct nft_data to release
7124 * @type: type of data
7125 *
7126 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7127 * all others need to be released by calling this function.
7128 */
59105446 7129void nft_data_release(const struct nft_data *data, enum nft_data_types type)
96518518 7130{
960bd2c2 7131 if (type < NFT_DATA_VERDICT)
96518518 7132 return;
960bd2c2 7133 switch (type) {
96518518
PM		 7134 case NFT_DATA_VERDICT:
7135 return nft_verdict_uninit(data);
7136 default:
7137 WARN_ON(1);
7138 }
7139}
59105446 7140EXPORT_SYMBOL_GPL(nft_data_release);
96518518
PM		 7141
7142int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
7143 enum nft_data_types type, unsigned int len)
7144{
7145 struct nlattr *nest;
7146 int err;
7147
7148 nest = nla_nest_start(skb, attr);
7149 if (nest == NULL)
7150 return -1;
7151
7152 switch (type) {
7153 case NFT_DATA_VALUE:
7154 err = nft_value_dump(skb, data, len);
7155 break;
7156 case NFT_DATA_VERDICT:
33d5a7b1 7157 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
96518518
PM		 7158 break;
7159 default:
7160 err = -EINVAL;
7161 WARN_ON(1);
7162 }
7163
7164 nla_nest_end(skb, nest);
7165 return err;
7166}
7167EXPORT_SYMBOL_GPL(nft_data_dump);
7168
5ebe0b0e
PNA		 7169int __nft_release_basechain(struct nft_ctx *ctx)
7170{
7171 struct nft_rule *rule, *nr;
7172
f323d954 7173 BUG_ON(!nft_is_base_chain(ctx->chain));
5ebe0b0e 7174
c974a3a3 7175 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
5ebe0b0e
PNA		 7176 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
7177 list_del(&rule->list);
7178 ctx->chain->use--;
bb7b40ae 7179 nf_tables_rule_release(ctx, rule);
5ebe0b0e 7180 }
1b2470e5 7181 nft_chain_del(ctx->chain);
5ebe0b0e 7182 ctx->table->use--;
43a605f2 7183 nf_tables_chain_destroy(ctx);
5ebe0b0e
PNA		 7184
7185 return 0;
7186}
7187EXPORT_SYMBOL_GPL(__nft_release_basechain);
7188
98319cb9 7189static void __nft_release_tables(struct net *net)
df05ef87 7190{
3b49e2e9 7191 struct nft_flowtable *flowtable, *nf;
df05ef87
PNA		 7192 struct nft_table *table, *nt;
7193 struct nft_chain *chain, *nc;
e5009240 7194 struct nft_object *obj, *ne;
df05ef87
PNA		 7195 struct nft_rule *rule, *nr;
7196 struct nft_set *set, *ns;
7197 struct nft_ctx ctx = {
7198 .net = net,
43a605f2 7199 .family = NFPROTO_NETDEV,
df05ef87
PNA		 7200 };
7201
36596dad 7202 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
98319cb9 7203 ctx.family = table->family;
dd4cbef7 7204
df05ef87 7205 list_for_each_entry(chain, &table->chains, list)
c974a3a3 7206 nf_tables_unregister_hook(net, table, chain);
3b49e2e9
PNA		 7207 list_for_each_entry(flowtable, &table->flowtables, list)
7208 nf_unregister_net_hooks(net, flowtable->ops,
7209 flowtable->ops_len);
df05ef87
PNA		 7210 /* No packets are walking on these chains anymore. */
7211 ctx.table = table;
7212 list_for_each_entry(chain, &table->chains, list) {
7213 ctx.chain = chain;
7214 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
7215 list_del(&rule->list);
7216 chain->use--;
bb7b40ae 7217 nf_tables_rule_release(&ctx, rule);
df05ef87
PNA		 7218 }
7219 }
3b49e2e9
PNA		 7220 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
7221 list_del(&flowtable->list);
7222 table->use--;
7223 nf_tables_flowtable_destroy(flowtable);
7224 }
df05ef87
PNA		 7225 list_for_each_entry_safe(set, ns, &table->sets, list) {
7226 list_del(&set->list);
7227 table->use--;
7228 nft_set_destroy(set);
7229 }
e5009240
PNA		 7230 list_for_each_entry_safe(obj, ne, &table->objects, list) {
7231 list_del(&obj->list);
7232 table->use--;
00bfb320 7233 nft_obj_destroy(&ctx, obj);
e5009240 7234 }
df05ef87 7235 list_for_each_entry_safe(chain, nc, &table->chains, list) {
43a605f2 7236 ctx.chain = chain;
1b2470e5 7237 nft_chain_del(chain);
df05ef87 7238 table->use--;
43a605f2 7239 nf_tables_chain_destroy(&ctx);
df05ef87
PNA		 7240 }
7241 list_del(&table->list);
7242 nf_tables_table_destroy(&ctx);
7243 }
7244}
7245
dd4cbef7
PNA		 7246static int __net_init nf_tables_init_net(struct net *net)
7247{
7248 INIT_LIST_HEAD(&net->nft.tables);
7249 INIT_LIST_HEAD(&net->nft.commit_list);
f102d66b 7250 mutex_init(&net->nft.commit_mutex);
dd4cbef7 7251 net->nft.base_seq = 1;
a654de8f
PNA		 7252 net->nft.validate_state = NFT_VALIDATE_SKIP;
7253
dd4cbef7
PNA		 7254 return 0;
7255}
7256
7257static void __net_exit nf_tables_exit_net(struct net *net)
7258{
f102d66b 7259 mutex_lock(&net->nft.commit_mutex);
71ad00c5
FW		 7260 if (!list_empty(&net->nft.commit_list))
7261 __nf_tables_abort(net);
98319cb9 7262 __nft_release_tables(net);
f102d66b 7263 mutex_unlock(&net->nft.commit_mutex);
dd4cbef7 7264 WARN_ON_ONCE(!list_empty(&net->nft.tables));
dd4cbef7
PNA		 7265}
7266
99633ab2
PNA		 7267static struct pernet_operations nf_tables_net_ops = {
7268 .init = nf_tables_init_net,
613d0776 7269 .exit = nf_tables_exit_net,
99633ab2
PNA		 7270};
7271
96518518
PM		 7272static int __init nf_tables_module_init(void)
7273{
7274 int err;
7275
02c7b25e
PNA		 7276 nft_chain_filter_init();
7277
96518518
PM		 7278 err = nf_tables_core_module_init();
7279 if (err < 0)
2a43ecf9 7280 return err;
96518518
PM		 7281
7282 err = nfnetlink_subsys_register(&nf_tables_subsys);
7283 if (err < 0)
2a43ecf9 7284 goto err;
96518518 7285
3b49e2e9
PNA		 7286 register_netdevice_notifier(&nf_tables_flowtable_notifier);
7287
99633ab2 7288 return register_pernet_subsys(&nf_tables_net_ops);
2a43ecf9 7289err:
96518518 7290 nf_tables_core_module_exit();
96518518
PM		 7291 return err;
7292}
7293
7294static void __exit nf_tables_module_exit(void)
7295{
7296 nfnetlink_subsys_unregister(&nf_tables_subsys);
3b49e2e9 7297 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
0a2cf5ee 7298 nft_chain_filter_fini();
71ad00c5 7299 unregister_pernet_subsys(&nf_tables_net_ops);
1b1bc49c 7300 rcu_barrier();
96518518 7301 nf_tables_core_module_exit();
96518518
PM		 7302}
7303
7304module_init(nf_tables_module_init);
7305module_exit(nf_tables_module_exit);
7306
7307MODULE_LICENSE("GPL");
7308MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
7309MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
Ubuntu Jammy Linux kernel mirror