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netfilter: conntrack: use get_random_once for conntrack hash seed
[linux-2.6-block.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>
16#include <linux/netfilter.h>
17#include <linux/netfilter/nfnetlink.h>
18#include <linux/netfilter/nf_tables.h>
19#include <net/netfilter/nf_tables_core.h>
20#include <net/netfilter/nf_tables.h>
99633ab2 21#include <net/net_namespace.h>
96518518
PM		 22#include <net/sock.h>
23
96518518
PM		 24static LIST_HEAD(nf_tables_expressions);
25
26/**
27 * nft_register_afinfo - register nf_tables address family info
28 *
29 * @afi: address family info to register
30 *
31 * Register the address family for use with nf_tables. Returns zero on
32 * success or a negative errno code otherwise.
33 */
99633ab2 34int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
96518518
PM		 35{
36 INIT_LIST_HEAD(&afi->tables);
37 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 38 list_add_tail_rcu(&afi->list, &net->nft.af_info);
96518518
PM		 39 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
40 return 0;
41}
42EXPORT_SYMBOL_GPL(nft_register_afinfo);
43
df05ef87
PNA		 44static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi);
45
96518518
PM		 46/**
47 * nft_unregister_afinfo - unregister nf_tables address family info
48 *
49 * @afi: address family info to unregister
50 *
51 * Unregister the address family for use with nf_tables.
52 */
df05ef87 53void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi)
96518518
PM		 54{
55 nfnl_lock(NFNL_SUBSYS_NFTABLES);
df05ef87 56 __nft_release_afinfo(net, afi);
e688a7f8 57 list_del_rcu(&afi->list);
96518518
PM		 58 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
59}
60EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
61
99633ab2 62static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
96518518
PM		 63{
64 struct nft_af_info *afi;
65
99633ab2 66 list_for_each_entry(afi, &net->nft.af_info, list) {
96518518
PM		 67 if (afi->family == family)
68 return afi;
69 }
70 return NULL;
71}
72
99633ab2
PNA		 73static struct nft_af_info *
74nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
96518518
PM		 75{
76 struct nft_af_info *afi;
77
99633ab2 78 afi = nft_afinfo_lookup(net, family);
96518518
PM		 79 if (afi != NULL)
80 return afi;
81#ifdef CONFIG_MODULES
82 if (autoload) {
83 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
84 request_module("nft-afinfo-%u", family);
85 nfnl_lock(NFNL_SUBSYS_NFTABLES);
99633ab2 86 afi = nft_afinfo_lookup(net, family);
96518518
PM		 87 if (afi != NULL)
88 return ERR_PTR(-EAGAIN);
89 }
90#endif
91 return ERR_PTR(-EAFNOSUPPORT);
92}
93
7c95f6d8 94static void nft_ctx_init(struct nft_ctx *ctx,
633c9a84 95 struct net *net,
7c95f6d8
PNA		 96 const struct sk_buff *skb,
97 const struct nlmsghdr *nlh,
98 struct nft_af_info *afi,
99 struct nft_table *table,
100 struct nft_chain *chain,
101 const struct nlattr * const *nla)
102{
633c9a84 103 ctx->net = net;
128ad332
PNA		 104 ctx->afi = afi;
105 ctx->table = table;
106 ctx->chain = chain;
107 ctx->nla = nla;
108 ctx->portid = NETLINK_CB(skb).portid;
109 ctx->report = nlmsg_report(nlh);
110 ctx->seq = nlh->nlmsg_seq;
7c95f6d8
PNA		 111}
112
b380e5c7
PNA		 113static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type,
114 u32 size)
1081d11b
PNA		 115{
116 struct nft_trans *trans;
117
118 trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL);
119 if (trans == NULL)
120 return NULL;
121
b380e5c7 122 trans->msg_type = msg_type;
1081d11b
PNA		 123 trans->ctx = *ctx;
124
125 return trans;
126}
127
128static void nft_trans_destroy(struct nft_trans *trans)
129{
130 list_del(&trans->list);
131 kfree(trans);
132}
133
5ebe0b0e
PNA		 134static int nft_register_basechain(struct nft_base_chain *basechain,
135 unsigned int hook_nops)
d8ee8f7c 136{
fd2ecda0
EB		 137 struct net *net = read_pnet(&basechain->pnet);
138
835b8033
PNA		 139 if (basechain->flags & NFT_BASECHAIN_DISABLED)
140 return 0;
141
fd2ecda0 142 return nf_register_net_hooks(net, basechain->ops, hook_nops);
d8ee8f7c
PNA		 143}
144
5ebe0b0e
PNA		 145static void nft_unregister_basechain(struct nft_base_chain *basechain,
146 unsigned int hook_nops)
d8ee8f7c 147{
fd2ecda0
EB		 148 struct net *net = read_pnet(&basechain->pnet);
149
835b8033
PNA		 150 if (basechain->flags & NFT_BASECHAIN_DISABLED)
151 return;
152
fd2ecda0 153 nf_unregister_net_hooks(net, basechain->ops, hook_nops);
d8ee8f7c
PNA		 154}
155
156static int nf_tables_register_hooks(const struct nft_table *table,
157 struct nft_chain *chain,
158 unsigned int hook_nops)
159{
160 if (table->flags & NFT_TABLE_F_DORMANT ||
161 !(chain->flags & NFT_BASE_CHAIN))
162 return 0;
163
164 return nft_register_basechain(nft_base_chain(chain), hook_nops);
165}
166
c5598794 167static void nf_tables_unregister_hooks(const struct nft_table *table,
d8ee8f7c 168 struct nft_chain *chain,
c5598794
AB		 169 unsigned int hook_nops)
170{
d8ee8f7c
PNA		 171 if (table->flags & NFT_TABLE_F_DORMANT ||
172 !(chain->flags & NFT_BASE_CHAIN))
173 return;
174
175 nft_unregister_basechain(nft_base_chain(chain), hook_nops);
c5598794
AB		 176}
177
ee01d542
AB		 178/* Internal table flags */
179#define NFT_TABLE_INACTIVE (1 << 15)
180
181static int nft_trans_table_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_table));
186 if (trans == NULL)
187 return -ENOMEM;
188
189 if (msg_type == NFT_MSG_NEWTABLE)
190 ctx->table->flags |= NFT_TABLE_INACTIVE;
191
192 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
193 return 0;
194}
195
196static int nft_deltable(struct nft_ctx *ctx)
197{
198 int err;
199
200 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
201 if (err < 0)
202 return err;
203
204 list_del_rcu(&ctx->table->list);
205 return err;
206}
207
208static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
209{
210 struct nft_trans *trans;
211
212 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
213 if (trans == NULL)
214 return -ENOMEM;
215
216 if (msg_type == NFT_MSG_NEWCHAIN)
217 ctx->chain->flags |= NFT_CHAIN_INACTIVE;
218
219 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
220 return 0;
221}
222
223static int nft_delchain(struct nft_ctx *ctx)
224{
225 int err;
226
227 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
228 if (err < 0)
229 return err;
230
231 ctx->table->use--;
232 list_del_rcu(&ctx->chain->list);
233
234 return err;
235}
236
237static inline bool
238nft_rule_is_active(struct net *net, const struct nft_rule *rule)
239{
ea4bd995 240 return (rule->genmask & nft_genmask_cur(net)) == 0;
ee01d542
AB		 241}
242
243static inline int
244nft_rule_is_active_next(struct net *net, const struct nft_rule *rule)
245{
ea4bd995 246 return (rule->genmask & nft_genmask_next(net)) == 0;
ee01d542
AB		 247}
248
249static inline void
250nft_rule_activate_next(struct net *net, struct nft_rule *rule)
251{
252 /* Now inactive, will be active in the future */
ea4bd995 253 rule->genmask = nft_genmask_cur(net);
ee01d542
AB		 254}
255
256static inline void
257nft_rule_deactivate_next(struct net *net, struct nft_rule *rule)
258{
ea4bd995 259 rule->genmask = nft_genmask_next(net);
ee01d542
AB		 260}
261
262static inline void nft_rule_clear(struct net *net, struct nft_rule *rule)
263{
ea4bd995 264 rule->genmask &= ~nft_genmask_next(net);
ee01d542
AB		 265}
266
267static int
268nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
269{
270 /* You cannot delete the same rule twice */
271 if (nft_rule_is_active_next(ctx->net, rule)) {
272 nft_rule_deactivate_next(ctx->net, rule);
273 ctx->chain->use--;
274 return 0;
275 }
276 return -ENOENT;
277}
278
279static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
280 struct nft_rule *rule)
281{
282 struct nft_trans *trans;
283
284 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
285 if (trans == NULL)
286 return NULL;
287
288 nft_trans_rule(trans) = rule;
289 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
290
291 return trans;
292}
293
294static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
295{
296 struct nft_trans *trans;
297 int err;
298
299 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
300 if (trans == NULL)
301 return -ENOMEM;
302
303 err = nf_tables_delrule_deactivate(ctx, rule);
304 if (err < 0) {
305 nft_trans_destroy(trans);
306 return err;
307 }
308
309 return 0;
310}
311
312static int nft_delrule_by_chain(struct nft_ctx *ctx)
313{
314 struct nft_rule *rule;
315 int err;
316
317 list_for_each_entry(rule, &ctx->chain->rules, list) {
318 err = nft_delrule(ctx, rule);
319 if (err < 0)
320 return err;
321 }
322 return 0;
323}
324
325/* Internal set flag */
326#define NFT_SET_INACTIVE (1 << 15)
327
328static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
329 struct nft_set *set)
330{
331 struct nft_trans *trans;
332
333 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
334 if (trans == NULL)
335 return -ENOMEM;
336
337 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
338 nft_trans_set_id(trans) =
339 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
340 set->flags |= NFT_SET_INACTIVE;
341 }
342 nft_trans_set(trans) = set;
343 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
344
345 return 0;
346}
347
348static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
349{
350 int err;
351
352 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
353 if (err < 0)
354 return err;
355
356 list_del_rcu(&set->list);
357 ctx->table->use--;
358
359 return err;
360}
361
96518518
PM		 362/*
363 * Tables
364 */
365
366static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
367 const struct nlattr *nla)
368{
369 struct nft_table *table;
370
371 list_for_each_entry(table, &afi->tables, list) {
372 if (!nla_strcmp(nla, table->name))
373 return table;
374 }
375 return NULL;
376}
377
378static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
9370761c 379 const struct nlattr *nla)
96518518
PM		 380{
381 struct nft_table *table;
382
383 if (nla == NULL)
384 return ERR_PTR(-EINVAL);
385
386 table = nft_table_lookup(afi, nla);
387 if (table != NULL)
388 return table;
389
96518518
PM		 390 return ERR_PTR(-ENOENT);
391}
392
393static inline u64 nf_tables_alloc_handle(struct nft_table *table)
394{
395 return ++table->hgenerator;
396}
397
2a37d755 398static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
9370761c 399
2a37d755 400static const struct nf_chain_type *
baae3e62 401__nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
9370761c
PNA		 402{
403 int i;
404
baae3e62 405 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
9370761c
PNA		 406 if (chain_type[family][i] != NULL &&
407 !nla_strcmp(nla, chain_type[family][i]->name))
baae3e62 408 return chain_type[family][i];
9370761c 409 }
baae3e62 410 return NULL;
9370761c
PNA		 411}
412
2a37d755 413static const struct nf_chain_type *
baae3e62
PM		 414nf_tables_chain_type_lookup(const struct nft_af_info *afi,
415 const struct nlattr *nla,
416 bool autoload)
9370761c 417{
2a37d755 418 const struct nf_chain_type *type;
9370761c
PNA		 419
420 type = __nf_tables_chain_type_lookup(afi->family, nla);
93b0806f
PM		 421 if (type != NULL)
422 return type;
9370761c 423#ifdef CONFIG_MODULES
93b0806f 424 if (autoload) {
9370761c 425 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2fec6bb6
PNA		 426 request_module("nft-chain-%u-%.*s", afi->family,
427 nla_len(nla), (const char *)nla_data(nla));
9370761c
PNA		 428 nfnl_lock(NFNL_SUBSYS_NFTABLES);
429 type = __nf_tables_chain_type_lookup(afi->family, nla);
93b0806f
PM		 430 if (type != NULL)
431 return ERR_PTR(-EAGAIN);
9370761c
PNA		 432 }
433#endif
93b0806f 434 return ERR_PTR(-ENOENT);
9370761c
PNA		 435}
436
96518518 437static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
1cae565e
PNA		 438 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
439 .len = NFT_TABLE_MAXNAMELEN - 1 },
9ddf6323 440 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
96518518
PM		 441};
442
84d7fce6
PNA		 443static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
444 u32 portid, u32 seq, int event, u32 flags,
445 int family, const struct nft_table *table)
96518518
PM		 446{
447 struct nlmsghdr *nlh;
448 struct nfgenmsg *nfmsg;
449
450 event |= NFNL_SUBSYS_NFTABLES << 8;
451 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
452 if (nlh == NULL)
453 goto nla_put_failure;
454
455 nfmsg = nlmsg_data(nlh);
456 nfmsg->nfgen_family = family;
457 nfmsg->version = NFNETLINK_V0;
84d7fce6 458 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518 459
9ddf6323 460 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
d8bcc768
TB		 461 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
462 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
96518518
PM		 463 goto nla_put_failure;
464
053c095a
JB		 465 nlmsg_end(skb, nlh);
466 return 0;
96518518
PM		 467
468nla_put_failure:
469 nlmsg_trim(skb, nlh);
470 return -1;
471}
472
35151d84 473static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 474{
475 struct sk_buff *skb;
96518518
PM		 476 int err;
477
128ad332
PNA		 478 if (!ctx->report &&
479 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
96518518
PM		 480 return 0;
481
482 err = -ENOBUFS;
483 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
484 if (skb == NULL)
485 goto err;
486
84d7fce6
PNA		 487 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
488 event, 0, ctx->afi->family, ctx->table);
96518518
PM		 489 if (err < 0) {
490 kfree_skb(skb);
491 goto err;
492 }
493
128ad332
PNA		 494 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
495 ctx->report, GFP_KERNEL);
96518518 496err:
128ad332
PNA		 497 if (err < 0) {
498 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
499 err);
500 }
96518518
PM		 501 return err;
502}
503
504static int nf_tables_dump_tables(struct sk_buff *skb,
505 struct netlink_callback *cb)
506{
507 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
508 const struct nft_af_info *afi;
509 const struct nft_table *table;
510 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 511 struct net *net = sock_net(skb->sk);
96518518
PM		 512 int family = nfmsg->nfgen_family;
513
e688a7f8 514 rcu_read_lock();
38e029f1
PNA		 515 cb->seq = net->nft.base_seq;
516
e688a7f8 517 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 518 if (family != NFPROTO_UNSPEC && family != afi->family)
519 continue;
520
e688a7f8 521 list_for_each_entry_rcu(table, &afi->tables, list) {
96518518
PM		 522 if (idx < s_idx)
523 goto cont;
524 if (idx > s_idx)
525 memset(&cb->args[1], 0,
526 sizeof(cb->args) - sizeof(cb->args[0]));
84d7fce6 527 if (nf_tables_fill_table_info(skb, net,
96518518
PM		 528 NETLINK_CB(cb->skb).portid,
529 cb->nlh->nlmsg_seq,
530 NFT_MSG_NEWTABLE,
531 NLM_F_MULTI,
532 afi->family, table) < 0)
533 goto done;
38e029f1
PNA		 534
535 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 536cont:
537 idx++;
538 }
539 }
540done:
e688a7f8 541 rcu_read_unlock();
96518518
PM		 542 cb->args[0] = idx;
543 return skb->len;
544}
545
7b8002a1
PNA		 546static int nf_tables_gettable(struct net *net, struct sock *nlsk,
547 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 548 const struct nlattr * const nla[])
549{
550 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
551 const struct nft_af_info *afi;
552 const struct nft_table *table;
553 struct sk_buff *skb2;
554 int family = nfmsg->nfgen_family;
555 int err;
556
557 if (nlh->nlmsg_flags & NLM_F_DUMP) {
558 struct netlink_dump_control c = {
559 .dump = nf_tables_dump_tables,
560 };
561 return netlink_dump_start(nlsk, skb, nlh, &c);
562 }
563
99633ab2 564 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 565 if (IS_ERR(afi))
566 return PTR_ERR(afi);
567
9370761c 568 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
96518518
PM		 569 if (IS_ERR(table))
570 return PTR_ERR(table);
55dd6f93
PNA		 571 if (table->flags & NFT_TABLE_INACTIVE)
572 return -ENOENT;
96518518
PM		 573
574 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
575 if (!skb2)
576 return -ENOMEM;
577
84d7fce6 578 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 579 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
580 family, table);
581 if (err < 0)
582 goto err;
583
584 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
585
586err:
587 kfree_skb(skb2);
588 return err;
589}
590
115a60b1
PM		 591static int nf_tables_table_enable(const struct nft_af_info *afi,
592 struct nft_table *table)
9ddf6323
PNA		 593{
594 struct nft_chain *chain;
595 int err, i = 0;
596
597 list_for_each_entry(chain, &table->chains, list) {
d2012975
PNA		 598 if (!(chain->flags & NFT_BASE_CHAIN))
599 continue;
600
d8ee8f7c 601 err = nft_register_basechain(nft_base_chain(chain), afi->nops);
9ddf6323
PNA		 602 if (err < 0)
603 goto err;
604
605 i++;
606 }
607 return 0;
608err:
609 list_for_each_entry(chain, &table->chains, list) {
d2012975
PNA		 610 if (!(chain->flags & NFT_BASE_CHAIN))
611 continue;
612
9ddf6323
PNA		 613 if (i-- <= 0)
614 break;
615
d8ee8f7c 616 nft_unregister_basechain(nft_base_chain(chain), afi->nops);
9ddf6323
PNA		 617 }
618 return err;
619}
620
f75edf5e 621static void nf_tables_table_disable(const struct nft_af_info *afi,
d8ee8f7c 622 struct nft_table *table)
9ddf6323
PNA		 623{
624 struct nft_chain *chain;
625
d2012975
PNA		 626 list_for_each_entry(chain, &table->chains, list) {
627 if (chain->flags & NFT_BASE_CHAIN)
d8ee8f7c
PNA		 628 nft_unregister_basechain(nft_base_chain(chain),
629 afi->nops);
d2012975 630 }
9ddf6323
PNA		 631}
632
e1aaca93 633static int nf_tables_updtable(struct nft_ctx *ctx)
9ddf6323 634{
55dd6f93 635 struct nft_trans *trans;
e1aaca93 636 u32 flags;
55dd6f93 637 int ret = 0;
9ddf6323 638
e1aaca93
PNA		 639 if (!ctx->nla[NFTA_TABLE_FLAGS])
640 return 0;
9ddf6323 641
e1aaca93
PNA		 642 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
643 if (flags & ~NFT_TABLE_F_DORMANT)
644 return -EINVAL;
645
63283dd2
PNA		 646 if (flags == ctx->table->flags)
647 return 0;
648
55dd6f93
PNA		 649 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
650 sizeof(struct nft_trans_table));
651 if (trans == NULL)
652 return -ENOMEM;
9ddf6323 653
e1aaca93
PNA		 654 if ((flags & NFT_TABLE_F_DORMANT) &&
655 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
55dd6f93 656 nft_trans_table_enable(trans) = false;
e1aaca93
PNA		 657 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
658 ctx->table->flags & NFT_TABLE_F_DORMANT) {
659 ret = nf_tables_table_enable(ctx->afi, ctx->table);
55dd6f93 660 if (ret >= 0) {
e1aaca93 661 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
55dd6f93 662 nft_trans_table_enable(trans) = true;
9ddf6323 663 }
9ddf6323 664 }
e1aaca93
PNA		 665 if (ret < 0)
666 goto err;
9ddf6323 667
55dd6f93
PNA		 668 nft_trans_table_update(trans) = true;
669 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
670 return 0;
9ddf6323 671err:
55dd6f93 672 nft_trans_destroy(trans);
9ddf6323
PNA		 673 return ret;
674}
675
633c9a84
PNA		 676static int nf_tables_newtable(struct net *net, struct sock *nlsk,
677 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 678 const struct nlattr * const nla[])
679{
680 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
681 const struct nlattr *name;
682 struct nft_af_info *afi;
683 struct nft_table *table;
684 int family = nfmsg->nfgen_family;
c5c1f975 685 u32 flags = 0;
e1aaca93 686 struct nft_ctx ctx;
55dd6f93 687 int err;
96518518 688
99633ab2 689 afi = nf_tables_afinfo_lookup(net, family, true);
96518518
PM		 690 if (IS_ERR(afi))
691 return PTR_ERR(afi);
692
693 name = nla[NFTA_TABLE_NAME];
9370761c 694 table = nf_tables_table_lookup(afi, name);
96518518
PM		 695 if (IS_ERR(table)) {
696 if (PTR_ERR(table) != -ENOENT)
697 return PTR_ERR(table);
698 table = NULL;
699 }
700
701 if (table != NULL) {
55dd6f93
PNA		 702 if (table->flags & NFT_TABLE_INACTIVE)
703 return -ENOENT;
96518518
PM		 704 if (nlh->nlmsg_flags & NLM_F_EXCL)
705 return -EEXIST;
706 if (nlh->nlmsg_flags & NLM_F_REPLACE)
707 return -EOPNOTSUPP;
e1aaca93 708
633c9a84 709 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
e1aaca93 710 return nf_tables_updtable(&ctx);
96518518
PM		 711 }
712
c5c1f975
PM		 713 if (nla[NFTA_TABLE_FLAGS]) {
714 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
715 if (flags & ~NFT_TABLE_F_DORMANT)
716 return -EINVAL;
717 }
718
ebddf1a8 719 err = -EAFNOSUPPORT;
7047f9d0 720 if (!try_module_get(afi->owner))
ebddf1a8 721 goto err1;
7047f9d0 722
ffdb210e 723 err = -ENOMEM;
1cae565e 724 table = kzalloc(sizeof(*table), GFP_KERNEL);
ffdb210e 725 if (table == NULL)
ebddf1a8 726 goto err2;
96518518 727
1cae565e 728 nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
96518518 729 INIT_LIST_HEAD(&table->chains);
20a69341 730 INIT_LIST_HEAD(&table->sets);
c5c1f975 731 table->flags = flags;
9ddf6323 732
633c9a84 733 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
55dd6f93 734 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
ffdb210e 735 if (err < 0)
ebddf1a8 736 goto err3;
ffdb210e 737
e688a7f8 738 list_add_tail_rcu(&table->list, &afi->tables);
96518518 739 return 0;
ebddf1a8 740err3:
ffdb210e 741 kfree(table);
ebddf1a8 742err2:
ffdb210e 743 module_put(afi->owner);
ebddf1a8 744err1:
ffdb210e 745 return err;
96518518
PM		 746}
747
b9ac12ef
AB		 748static int nft_flush_table(struct nft_ctx *ctx)
749{
750 int err;
751 struct nft_chain *chain, *nc;
752 struct nft_set *set, *ns;
753
a2f18db0 754 list_for_each_entry(chain, &ctx->table->chains, list) {
b9ac12ef
AB		 755 ctx->chain = chain;
756
757 err = nft_delrule_by_chain(ctx);
758 if (err < 0)
759 goto out;
b9ac12ef
AB		 760 }
761
762 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
763 if (set->flags & NFT_SET_ANONYMOUS &&
764 !list_empty(&set->bindings))
765 continue;
766
767 err = nft_delset(ctx, set);
768 if (err < 0)
769 goto out;
770 }
771
a2f18db0
PNA		 772 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
773 ctx->chain = chain;
774
775 err = nft_delchain(ctx);
776 if (err < 0)
777 goto out;
778 }
779
b9ac12ef
AB		 780 err = nft_deltable(ctx);
781out:
782 return err;
783}
784
785static int nft_flush(struct nft_ctx *ctx, int family)
786{
787 struct nft_af_info *afi;
788 struct nft_table *table, *nt;
789 const struct nlattr * const *nla = ctx->nla;
790 int err = 0;
791
792 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
793 if (family != AF_UNSPEC && afi->family != family)
794 continue;
795
796 ctx->afi = afi;
797 list_for_each_entry_safe(table, nt, &afi->tables, list) {
798 if (nla[NFTA_TABLE_NAME] &&
799 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
800 continue;
801
802 ctx->table = table;
803
804 err = nft_flush_table(ctx);
805 if (err < 0)
806 goto out;
807 }
808 }
809out:
810 return err;
811}
812
633c9a84
PNA		 813static int nf_tables_deltable(struct net *net, struct sock *nlsk,
814 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 815 const struct nlattr * const nla[])
816{
817 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
818 struct nft_af_info *afi;
819 struct nft_table *table;
ee01d542 820 int family = nfmsg->nfgen_family;
55dd6f93 821 struct nft_ctx ctx;
96518518 822
633c9a84 823 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
b9ac12ef
AB		 824 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
825 return nft_flush(&ctx, family);
826
99633ab2 827 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 828 if (IS_ERR(afi))
829 return PTR_ERR(afi);
830
9370761c 831 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
96518518
PM		 832 if (IS_ERR(table))
833 return PTR_ERR(table);
96518518 834
b9ac12ef
AB		 835 ctx.afi = afi;
836 ctx.table = table;
55dd6f93 837
b9ac12ef 838 return nft_flush_table(&ctx);
96518518
PM		 839}
840
55dd6f93
PNA		 841static void nf_tables_table_destroy(struct nft_ctx *ctx)
842{
4fefee57
PNA		 843 BUG_ON(ctx->table->use > 0);
844
55dd6f93
PNA		 845 kfree(ctx->table);
846 module_put(ctx->afi->owner);
847}
848
2a37d755 849int nft_register_chain_type(const struct nf_chain_type *ctype)
96518518 850{
9370761c 851 int err = 0;
96518518
PM		 852
853 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c
PNA		 854 if (chain_type[ctype->family][ctype->type] != NULL) {
855 err = -EBUSY;
856 goto out;
96518518 857 }
9370761c
PNA		 858 chain_type[ctype->family][ctype->type] = ctype;
859out:
96518518
PM		 860 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
861 return err;
862}
9370761c 863EXPORT_SYMBOL_GPL(nft_register_chain_type);
96518518 864
2a37d755 865void nft_unregister_chain_type(const struct nf_chain_type *ctype)
96518518 866{
96518518 867 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c 868 chain_type[ctype->family][ctype->type] = NULL;
96518518
PM		 869 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
870}
9370761c 871EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
96518518
PM		 872
873/*
874 * Chains
875 */
876
877static struct nft_chain *
878nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
879{
880 struct nft_chain *chain;
881
882 list_for_each_entry(chain, &table->chains, list) {
883 if (chain->handle == handle)
884 return chain;
885 }
886
887 return ERR_PTR(-ENOENT);
888}
889
890static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
891 const struct nlattr *nla)
892{
893 struct nft_chain *chain;
894
895 if (nla == NULL)
896 return ERR_PTR(-EINVAL);
897
898 list_for_each_entry(chain, &table->chains, list) {
899 if (!nla_strcmp(nla, chain->name))
900 return chain;
901 }
902
903 return ERR_PTR(-ENOENT);
904}
905
906static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
907 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
908 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
909 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
910 .len = NFT_CHAIN_MAXNAMELEN - 1 },
911 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
0ca743a5 912 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
4c1f7818 913 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
0ca743a5 914 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
96518518
PM		 915};
916
917static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
918 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
919 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
2cbce139
PNA		 920 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
921 .len = IFNAMSIZ - 1 },
96518518
PM		 922};
923
0ca743a5
PNA		 924static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
925{
926 struct nft_stats *cpu_stats, total;
927 struct nlattr *nest;
ce355e20
ED		 928 unsigned int seq;
929 u64 pkts, bytes;
0ca743a5
PNA		 930 int cpu;
931
932 memset(&total, 0, sizeof(total));
933 for_each_possible_cpu(cpu) {
934 cpu_stats = per_cpu_ptr(stats, cpu);
ce355e20
ED		 935 do {
936 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
937 pkts = cpu_stats->pkts;
938 bytes = cpu_stats->bytes;
939 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
940 total.pkts += pkts;
941 total.bytes += bytes;
0ca743a5
PNA		 942 }
943 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
944 if (nest == NULL)
945 goto nla_put_failure;
946
b46f6ded
ND		 947 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
948 NFTA_COUNTER_PAD) ||
949 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
950 NFTA_COUNTER_PAD))
0ca743a5
PNA		 951 goto nla_put_failure;
952
953 nla_nest_end(skb, nest);
954 return 0;
955
956nla_put_failure:
957 return -ENOSPC;
958}
959
84d7fce6
PNA		 960static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
961 u32 portid, u32 seq, int event, u32 flags,
962 int family, const struct nft_table *table,
96518518
PM		 963 const struct nft_chain *chain)
964{
965 struct nlmsghdr *nlh;
966 struct nfgenmsg *nfmsg;
967
968 event |= NFNL_SUBSYS_NFTABLES << 8;
969 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
970 if (nlh == NULL)
971 goto nla_put_failure;
972
973 nfmsg = nlmsg_data(nlh);
974 nfmsg->nfgen_family = family;
975 nfmsg->version = NFNETLINK_V0;
84d7fce6 976 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 977
978 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
979 goto nla_put_failure;
b46f6ded
ND		 980 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
981 NFTA_CHAIN_PAD))
96518518
PM		 982 goto nla_put_failure;
983 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
984 goto nla_put_failure;
985
986 if (chain->flags & NFT_BASE_CHAIN) {
0ca743a5 987 const struct nft_base_chain *basechain = nft_base_chain(chain);
115a60b1 988 const struct nf_hook_ops *ops = &basechain->ops[0];
0ca743a5
PNA		 989 struct nlattr *nest;
990
991 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
96518518
PM		 992 if (nest == NULL)
993 goto nla_put_failure;
994 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
995 goto nla_put_failure;
996 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
997 goto nla_put_failure;
2cbce139
PNA		 998 if (basechain->dev_name[0] &&
999 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1000 goto nla_put_failure;
96518518 1001 nla_nest_end(skb, nest);
9370761c 1002
0ca743a5
PNA		 1003 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1004 htonl(basechain->policy)))
1005 goto nla_put_failure;
1006
baae3e62
PM		 1007 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1008 goto nla_put_failure;
0ca743a5
PNA		 1009
1010 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
1011 goto nla_put_failure;
96518518
PM		 1012 }
1013
0ca743a5
PNA		 1014 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1015 goto nla_put_failure;
1016
053c095a
JB		 1017 nlmsg_end(skb, nlh);
1018 return 0;
96518518
PM		 1019
1020nla_put_failure:
1021 nlmsg_trim(skb, nlh);
1022 return -1;
1023}
1024
35151d84 1025static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 1026{
1027 struct sk_buff *skb;
96518518
PM		 1028 int err;
1029
128ad332
PNA		 1030 if (!ctx->report &&
1031 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
96518518
PM		 1032 return 0;
1033
1034 err = -ENOBUFS;
1035 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1036 if (skb == NULL)
1037 goto err;
1038
84d7fce6
PNA		 1039 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1040 event, 0, ctx->afi->family, ctx->table,
35151d84 1041 ctx->chain);
96518518
PM		 1042 if (err < 0) {
1043 kfree_skb(skb);
1044 goto err;
1045 }
1046
128ad332
PNA		 1047 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1048 ctx->report, GFP_KERNEL);
96518518 1049err:
128ad332
PNA		 1050 if (err < 0) {
1051 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1052 err);
1053 }
96518518
PM		 1054 return err;
1055}
1056
1057static int nf_tables_dump_chains(struct sk_buff *skb,
1058 struct netlink_callback *cb)
1059{
1060 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1061 const struct nft_af_info *afi;
1062 const struct nft_table *table;
1063 const struct nft_chain *chain;
1064 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1065 struct net *net = sock_net(skb->sk);
96518518
PM		 1066 int family = nfmsg->nfgen_family;
1067
e688a7f8 1068 rcu_read_lock();
38e029f1
PNA		 1069 cb->seq = net->nft.base_seq;
1070
e688a7f8 1071 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 1072 if (family != NFPROTO_UNSPEC && family != afi->family)
1073 continue;
1074
e688a7f8
PNA		 1075 list_for_each_entry_rcu(table, &afi->tables, list) {
1076 list_for_each_entry_rcu(chain, &table->chains, list) {
96518518
PM		 1077 if (idx < s_idx)
1078 goto cont;
1079 if (idx > s_idx)
1080 memset(&cb->args[1], 0,
1081 sizeof(cb->args) - sizeof(cb->args[0]));
84d7fce6
PNA		 1082 if (nf_tables_fill_chain_info(skb, net,
1083 NETLINK_CB(cb->skb).portid,
96518518
PM		 1084 cb->nlh->nlmsg_seq,
1085 NFT_MSG_NEWCHAIN,
1086 NLM_F_MULTI,
1087 afi->family, table, chain) < 0)
1088 goto done;
38e029f1
PNA		 1089
1090 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 1091cont:
1092 idx++;
1093 }
1094 }
1095 }
1096done:
e688a7f8 1097 rcu_read_unlock();
96518518
PM		 1098 cb->args[0] = idx;
1099 return skb->len;
1100}
1101
7b8002a1
PNA		 1102static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1103 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 1104 const struct nlattr * const nla[])
1105{
1106 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1107 const struct nft_af_info *afi;
1108 const struct nft_table *table;
1109 const struct nft_chain *chain;
1110 struct sk_buff *skb2;
1111 int family = nfmsg->nfgen_family;
1112 int err;
1113
1114 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1115 struct netlink_dump_control c = {
1116 .dump = nf_tables_dump_chains,
1117 };
1118 return netlink_dump_start(nlsk, skb, nlh, &c);
1119 }
1120
99633ab2 1121 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1122 if (IS_ERR(afi))
1123 return PTR_ERR(afi);
1124
9370761c 1125 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
96518518
PM		 1126 if (IS_ERR(table))
1127 return PTR_ERR(table);
55dd6f93
PNA		 1128 if (table->flags & NFT_TABLE_INACTIVE)
1129 return -ENOENT;
96518518
PM		 1130
1131 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1132 if (IS_ERR(chain))
1133 return PTR_ERR(chain);
91c7b38d
PNA		 1134 if (chain->flags & NFT_CHAIN_INACTIVE)
1135 return -ENOENT;
96518518
PM		 1136
1137 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1138 if (!skb2)
1139 return -ENOMEM;
1140
84d7fce6 1141 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 1142 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1143 family, table, chain);
1144 if (err < 0)
1145 goto err;
1146
1147 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1148
1149err:
1150 kfree_skb(skb2);
1151 return err;
1152}
1153
0ca743a5
PNA		 1154static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1155 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1156 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1157};
1158
ff3cd7b3 1159static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
0ca743a5
PNA		 1160{
1161 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1162 struct nft_stats __percpu *newstats;
1163 struct nft_stats *stats;
1164 int err;
1165
1166 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1167 if (err < 0)
ff3cd7b3 1168 return ERR_PTR(err);
0ca743a5
PNA		 1169
1170 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
ff3cd7b3 1171 return ERR_PTR(-EINVAL);
0ca743a5 1172
ce355e20 1173 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
0ca743a5 1174 if (newstats == NULL)
ff3cd7b3 1175 return ERR_PTR(-ENOMEM);
0ca743a5
PNA		 1176
1177 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1178 * are not exposed to userspace.
1179 */
e8781f70 1180 preempt_disable();
0ca743a5
PNA		 1181 stats = this_cpu_ptr(newstats);
1182 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1183 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
e8781f70 1184 preempt_enable();
0ca743a5 1185
ff3cd7b3
PNA		 1186 return newstats;
1187}
1188
1189static void nft_chain_stats_replace(struct nft_base_chain *chain,
1190 struct nft_stats __percpu *newstats)
1191{
b88825de
PNA		 1192 if (newstats == NULL)
1193 return;
1194
0ca743a5 1195 if (chain->stats) {
0ca743a5 1196 struct nft_stats __percpu *oldstats =
67a8fc27 1197 nft_dereference(chain->stats);
0ca743a5
PNA		 1198
1199 rcu_assign_pointer(chain->stats, newstats);
1200 synchronize_rcu();
1201 free_percpu(oldstats);
1202 } else
1203 rcu_assign_pointer(chain->stats, newstats);
0ca743a5
PNA		 1204}
1205
91c7b38d
PNA		 1206static void nf_tables_chain_destroy(struct nft_chain *chain)
1207{
1208 BUG_ON(chain->use > 0);
1209
1210 if (chain->flags & NFT_BASE_CHAIN) {
2cbce139
PNA		 1211 struct nft_base_chain *basechain = nft_base_chain(chain);
1212
1213 module_put(basechain->type->owner);
1214 free_percpu(basechain->stats);
1215 if (basechain->ops[0].dev != NULL)
1216 dev_put(basechain->ops[0].dev);
1217 kfree(basechain);
91c7b38d
PNA		 1218 } else {
1219 kfree(chain);
1220 }
1221}
1222
633c9a84
PNA		 1223static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1224 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 1225 const struct nlattr * const nla[])
1226{
1227 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1228 const struct nlattr * uninitialized_var(name);
7c95f6d8 1229 struct nft_af_info *afi;
96518518
PM		 1230 struct nft_table *table;
1231 struct nft_chain *chain;
0ca743a5 1232 struct nft_base_chain *basechain = NULL;
96518518
PM		 1233 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1234 int family = nfmsg->nfgen_family;
2cbce139 1235 struct net_device *dev = NULL;
57de2a0c 1236 u8 policy = NF_ACCEPT;
96518518 1237 u64 handle = 0;
115a60b1 1238 unsigned int i;
ff3cd7b3 1239 struct nft_stats __percpu *stats;
96518518
PM		 1240 int err;
1241 bool create;
91c7b38d 1242 struct nft_ctx ctx;
96518518
PM		 1243
1244 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1245
99633ab2 1246 afi = nf_tables_afinfo_lookup(net, family, true);
96518518
PM		 1247 if (IS_ERR(afi))
1248 return PTR_ERR(afi);
1249
9370761c 1250 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
96518518
PM		 1251 if (IS_ERR(table))
1252 return PTR_ERR(table);
1253
96518518
PM		 1254 chain = NULL;
1255 name = nla[NFTA_CHAIN_NAME];
1256
1257 if (nla[NFTA_CHAIN_HANDLE]) {
1258 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1259 chain = nf_tables_chain_lookup_byhandle(table, handle);
1260 if (IS_ERR(chain))
1261 return PTR_ERR(chain);
1262 } else {
1263 chain = nf_tables_chain_lookup(table, name);
1264 if (IS_ERR(chain)) {
1265 if (PTR_ERR(chain) != -ENOENT)
1266 return PTR_ERR(chain);
1267 chain = NULL;
1268 }
1269 }
1270
57de2a0c
PM		 1271 if (nla[NFTA_CHAIN_POLICY]) {
1272 if ((chain != NULL &&
d6b6cb1d
PNA		 1273 !(chain->flags & NFT_BASE_CHAIN)))
1274 return -EOPNOTSUPP;
1275
1276 if (chain == NULL &&
57de2a0c
PM		 1277 nla[NFTA_CHAIN_HOOK] == NULL)
1278 return -EOPNOTSUPP;
1279
8f46df18 1280 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
57de2a0c
PM		 1281 switch (policy) {
1282 case NF_DROP:
1283 case NF_ACCEPT:
1284 break;
1285 default:
1286 return -EINVAL;
1287 }
1288 }
1289
96518518 1290 if (chain != NULL) {
91c7b38d
PNA		 1291 struct nft_stats *stats = NULL;
1292 struct nft_trans *trans;
1293
1294 if (chain->flags & NFT_CHAIN_INACTIVE)
1295 return -ENOENT;
96518518
PM		 1296 if (nlh->nlmsg_flags & NLM_F_EXCL)
1297 return -EEXIST;
1298 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1299 return -EOPNOTSUPP;
1300
1301 if (nla[NFTA_CHAIN_HANDLE] && name &&
1302 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
1303 return -EEXIST;
1304
0ca743a5
PNA		 1305 if (nla[NFTA_CHAIN_COUNTERS]) {
1306 if (!(chain->flags & NFT_BASE_CHAIN))
1307 return -EOPNOTSUPP;
1308
ff3cd7b3
PNA		 1309 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1310 if (IS_ERR(stats))
1311 return PTR_ERR(stats);
0ca743a5
PNA		 1312 }
1313
633c9a84 1314 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
91c7b38d
PNA		 1315 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1316 sizeof(struct nft_trans_chain));
f5553c19
PNA		 1317 if (trans == NULL) {
1318 free_percpu(stats);
91c7b38d 1319 return -ENOMEM;
f5553c19 1320 }
4401a862 1321
91c7b38d
PNA		 1322 nft_trans_chain_stats(trans) = stats;
1323 nft_trans_chain_update(trans) = true;
4401a862 1324
91c7b38d
PNA		 1325 if (nla[NFTA_CHAIN_POLICY])
1326 nft_trans_chain_policy(trans) = policy;
1327 else
1328 nft_trans_chain_policy(trans) = -1;
96518518 1329
91c7b38d
PNA		 1330 if (nla[NFTA_CHAIN_HANDLE] && name) {
1331 nla_strlcpy(nft_trans_chain_name(trans), name,
1332 NFT_CHAIN_MAXNAMELEN);
1333 }
1334 list_add_tail(&trans->list, &net->nft.commit_list);
1335 return 0;
96518518
PM		 1336 }
1337
75820676
PM		 1338 if (table->use == UINT_MAX)
1339 return -EOVERFLOW;
1340
96518518 1341 if (nla[NFTA_CHAIN_HOOK]) {
2a37d755 1342 const struct nf_chain_type *type;
96518518 1343 struct nf_hook_ops *ops;
9370761c 1344 nf_hookfn *hookfn;
115a60b1 1345 u32 hooknum, priority;
9370761c 1346
baae3e62 1347 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
9370761c
PNA		 1348 if (nla[NFTA_CHAIN_TYPE]) {
1349 type = nf_tables_chain_type_lookup(afi,
1350 nla[NFTA_CHAIN_TYPE],
1351 create);
93b0806f
PM		 1352 if (IS_ERR(type))
1353 return PTR_ERR(type);
9370761c 1354 }
96518518
PM		 1355
1356 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1357 nft_hook_policy);
1358 if (err < 0)
1359 return err;
1360 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1361 ha[NFTA_HOOK_PRIORITY] == NULL)
1362 return -EINVAL;
9370761c
PNA		 1363
1364 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1365 if (hooknum >= afi->nhooks)
96518518 1366 return -EINVAL;
115a60b1 1367 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
96518518 1368
baae3e62 1369 if (!(type->hook_mask & (1 << hooknum)))
9370761c 1370 return -EOPNOTSUPP;
fa2c1de0 1371 if (!try_module_get(type->owner))
baae3e62 1372 return -ENOENT;
fa2c1de0 1373 hookfn = type->hooks[hooknum];
9370761c 1374
2cbce139
PNA		 1375 if (afi->flags & NFT_AF_NEEDS_DEV) {
1376 char ifname[IFNAMSIZ];
1377
1378 if (!ha[NFTA_HOOK_DEV]) {
1379 module_put(type->owner);
1380 return -EOPNOTSUPP;
1381 }
1382
1383 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1384 dev = dev_get_by_name(net, ifname);
1385 if (!dev) {
1386 module_put(type->owner);
1387 return -ENOENT;
1388 }
1389 } else if (ha[NFTA_HOOK_DEV]) {
1390 module_put(type->owner);
1391 return -EOPNOTSUPP;
1392 }
1393
96518518 1394 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
f5553c19
PNA		 1395 if (basechain == NULL) {
1396 module_put(type->owner);
2cbce139
PNA		 1397 if (dev != NULL)
1398 dev_put(dev);
96518518 1399 return -ENOMEM;
f5553c19 1400 }
9370761c 1401
2cbce139
PNA		 1402 if (dev != NULL)
1403 strncpy(basechain->dev_name, dev->name, IFNAMSIZ);
1404
4401a862 1405 if (nla[NFTA_CHAIN_COUNTERS]) {
ff3cd7b3
PNA		 1406 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1407 if (IS_ERR(stats)) {
fa2c1de0 1408 module_put(type->owner);
4401a862 1409 kfree(basechain);
2cbce139
PNA		 1410 if (dev != NULL)
1411 dev_put(dev);
ff3cd7b3 1412 return PTR_ERR(stats);
4401a862 1413 }
ff3cd7b3 1414 basechain->stats = stats;
4401a862 1415 } else {
ce355e20 1416 stats = netdev_alloc_pcpu_stats(struct nft_stats);
c123bb71 1417 if (stats == NULL) {
fa2c1de0 1418 module_put(type->owner);
4401a862 1419 kfree(basechain);
2cbce139
PNA		 1420 if (dev != NULL)
1421 dev_put(dev);
c123bb71 1422 return -ENOMEM;
4401a862 1423 }
ff3cd7b3 1424 rcu_assign_pointer(basechain->stats, stats);
4401a862
PM		 1425 }
1426
5ebb335d 1427 write_pnet(&basechain->pnet, net);
9370761c 1428 basechain->type = type;
96518518
PM		 1429 chain = &basechain->chain;
1430
115a60b1
PM		 1431 for (i = 0; i < afi->nops; i++) {
1432 ops = &basechain->ops[i];
1433 ops->pf = family;
115a60b1
PM		 1434 ops->hooknum = hooknum;
1435 ops->priority = priority;
1436 ops->priv = chain;
1437 ops->hook = afi->hooks[ops->hooknum];
2cbce139 1438 ops->dev = dev;
115a60b1
PM		 1439 if (hookfn)
1440 ops->hook = hookfn;
1441 if (afi->hook_ops_init)
1442 afi->hook_ops_init(ops, i);
1443 }
96518518
PM		 1444
1445 chain->flags |= NFT_BASE_CHAIN;
57de2a0c 1446 basechain->policy = policy;
96518518
PM		 1447 } else {
1448 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1449 if (chain == NULL)
1450 return -ENOMEM;
1451 }
1452
1453 INIT_LIST_HEAD(&chain->rules);
1454 chain->handle = nf_tables_alloc_handle(table);
b5bc89bf 1455 chain->table = table;
96518518
PM		 1456 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1457
d8ee8f7c
PNA		 1458 err = nf_tables_register_hooks(table, chain, afi->nops);
1459 if (err < 0)
1460 goto err1;
96518518 1461
633c9a84 1462 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
91c7b38d
PNA		 1463 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1464 if (err < 0)
1465 goto err2;
96518518 1466
4fefee57 1467 table->use++;
e688a7f8 1468 list_add_tail_rcu(&chain->list, &table->chains);
91c7b38d
PNA		 1469 return 0;
1470err2:
c5598794 1471 nf_tables_unregister_hooks(table, chain, afi->nops);
91c7b38d
PNA		 1472err1:
1473 nf_tables_chain_destroy(chain);
1474 return err;
96518518
PM		 1475}
1476
633c9a84
PNA		 1477static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1478 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 1479 const struct nlattr * const nla[])
1480{
1481 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8 1482 struct nft_af_info *afi;
96518518
PM		 1483 struct nft_table *table;
1484 struct nft_chain *chain;
1485 int family = nfmsg->nfgen_family;
91c7b38d 1486 struct nft_ctx ctx;
96518518 1487
99633ab2 1488 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1489 if (IS_ERR(afi))
1490 return PTR_ERR(afi);
1491
9370761c 1492 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
96518518
PM		 1493 if (IS_ERR(table))
1494 return PTR_ERR(table);
1495
1496 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1497 if (IS_ERR(chain))
1498 return PTR_ERR(chain);
4fefee57 1499 if (chain->use > 0)
96518518
PM		 1500 return -EBUSY;
1501
633c9a84 1502 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0165d932 1503
ee01d542 1504 return nft_delchain(&ctx);
96518518
PM		 1505}
1506
96518518
PM		 1507/*
1508 * Expressions
1509 */
1510
1511/**
ef1f7df9
PM		 1512 * nft_register_expr - register nf_tables expr type
1513 * @ops: expr type
96518518 1514 *
ef1f7df9 1515 * Registers the expr type for use with nf_tables. Returns zero on
96518518
PM		 1516 * success or a negative errno code otherwise.
1517 */
ef1f7df9 1518int nft_register_expr(struct nft_expr_type *type)
96518518
PM		 1519{
1520 nfnl_lock(NFNL_SUBSYS_NFTABLES);
758dbcec 1521 if (type->family == NFPROTO_UNSPEC)
e688a7f8 1522 list_add_tail_rcu(&type->list, &nf_tables_expressions);
758dbcec 1523 else
e688a7f8 1524 list_add_rcu(&type->list, &nf_tables_expressions);
96518518
PM		 1525 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1526 return 0;
1527}
1528EXPORT_SYMBOL_GPL(nft_register_expr);
1529
1530/**
ef1f7df9
PM		 1531 * nft_unregister_expr - unregister nf_tables expr type
1532 * @ops: expr type
96518518 1533 *
ef1f7df9 1534 * Unregisters the expr typefor use with nf_tables.
96518518 1535 */
ef1f7df9 1536void nft_unregister_expr(struct nft_expr_type *type)
96518518
PM		 1537{
1538 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 1539 list_del_rcu(&type->list);
96518518
PM		 1540 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1541}
1542EXPORT_SYMBOL_GPL(nft_unregister_expr);
1543
64d46806
PM		 1544static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1545 struct nlattr *nla)
96518518 1546{
ef1f7df9 1547 const struct nft_expr_type *type;
96518518 1548
ef1f7df9 1549 list_for_each_entry(type, &nf_tables_expressions, list) {
64d46806
PM		 1550 if (!nla_strcmp(nla, type->name) &&
1551 (!type->family || type->family == family))
ef1f7df9 1552 return type;
96518518
PM		 1553 }
1554 return NULL;
1555}
1556
64d46806
PM		 1557static const struct nft_expr_type *nft_expr_type_get(u8 family,
1558 struct nlattr *nla)
96518518 1559{
ef1f7df9 1560 const struct nft_expr_type *type;
96518518
PM		 1561
1562 if (nla == NULL)
1563 return ERR_PTR(-EINVAL);
1564
64d46806 1565 type = __nft_expr_type_get(family, nla);
ef1f7df9
PM		 1566 if (type != NULL && try_module_get(type->owner))
1567 return type;
96518518
PM		 1568
1569#ifdef CONFIG_MODULES
ef1f7df9 1570 if (type == NULL) {
64d46806
PM		 1571 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1572 request_module("nft-expr-%u-%.*s", family,
1573 nla_len(nla), (char *)nla_data(nla));
1574 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1575 if (__nft_expr_type_get(family, nla))
1576 return ERR_PTR(-EAGAIN);
1577
96518518
PM		 1578 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1579 request_module("nft-expr-%.*s",
1580 nla_len(nla), (char *)nla_data(nla));
1581 nfnl_lock(NFNL_SUBSYS_NFTABLES);
64d46806 1582 if (__nft_expr_type_get(family, nla))
96518518
PM		 1583 return ERR_PTR(-EAGAIN);
1584 }
1585#endif
1586 return ERR_PTR(-ENOENT);
1587}
1588
1589static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1590 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1591 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1592};
1593
1594static int nf_tables_fill_expr_info(struct sk_buff *skb,
1595 const struct nft_expr *expr)
1596{
ef1f7df9 1597 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
96518518
PM		 1598 goto nla_put_failure;
1599
1600 if (expr->ops->dump) {
1601 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1602 if (data == NULL)
1603 goto nla_put_failure;
1604 if (expr->ops->dump(skb, expr) < 0)
1605 goto nla_put_failure;
1606 nla_nest_end(skb, data);
1607 }
1608
1609 return skb->len;
1610
1611nla_put_failure:
1612 return -1;
1613};
1614
0b2d8a7b
PM		 1615int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1616 const struct nft_expr *expr)
1617{
1618 struct nlattr *nest;
1619
1620 nest = nla_nest_start(skb, attr);
1621 if (!nest)
1622 goto nla_put_failure;
1623 if (nf_tables_fill_expr_info(skb, expr) < 0)
1624 goto nla_put_failure;
1625 nla_nest_end(skb, nest);
1626 return 0;
1627
1628nla_put_failure:
1629 return -1;
1630}
1631
96518518
PM		 1632struct nft_expr_info {
1633 const struct nft_expr_ops *ops;
ef1f7df9 1634 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
96518518
PM		 1635};
1636
0ca743a5
PNA		 1637static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1638 const struct nlattr *nla,
96518518
PM		 1639 struct nft_expr_info *info)
1640{
ef1f7df9 1641 const struct nft_expr_type *type;
96518518 1642 const struct nft_expr_ops *ops;
ef1f7df9 1643 struct nlattr *tb[NFTA_EXPR_MAX + 1];
96518518
PM		 1644 int err;
1645
ef1f7df9 1646 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
96518518
PM		 1647 if (err < 0)
1648 return err;
1649
64d46806 1650 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
ef1f7df9
PM		 1651 if (IS_ERR(type))
1652 return PTR_ERR(type);
1653
1654 if (tb[NFTA_EXPR_DATA]) {
1655 err = nla_parse_nested(info->tb, type->maxattr,
1656 tb[NFTA_EXPR_DATA], type->policy);
1657 if (err < 0)
1658 goto err1;
1659 } else
1660 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1661
1662 if (type->select_ops != NULL) {
0ca743a5
PNA		 1663 ops = type->select_ops(ctx,
1664 (const struct nlattr * const *)info->tb);
ef1f7df9
PM		 1665 if (IS_ERR(ops)) {
1666 err = PTR_ERR(ops);
1667 goto err1;
1668 }
1669 } else
1670 ops = type->ops;
1671
96518518
PM		 1672 info->ops = ops;
1673 return 0;
ef1f7df9
PM		 1674
1675err1:
1676 module_put(type->owner);
1677 return err;
96518518
PM		 1678}
1679
1680static int nf_tables_newexpr(const struct nft_ctx *ctx,
ef1f7df9 1681 const struct nft_expr_info *info,
96518518
PM		 1682 struct nft_expr *expr)
1683{
1684 const struct nft_expr_ops *ops = info->ops;
1685 int err;
1686
1687 expr->ops = ops;
1688 if (ops->init) {
ef1f7df9 1689 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
96518518
PM		 1690 if (err < 0)
1691 goto err1;
1692 }
1693
96518518
PM		 1694 return 0;
1695
1696err1:
1697 expr->ops = NULL;
1698 return err;
1699}
1700
62472bce
PM		 1701static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1702 struct nft_expr *expr)
96518518
PM		 1703{
1704 if (expr->ops->destroy)
62472bce 1705 expr->ops->destroy(ctx, expr);
ef1f7df9 1706 module_put(expr->ops->type->owner);
96518518
PM		 1707}
1708
0b2d8a7b
PM		 1709struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1710 const struct nlattr *nla)
1711{
1712 struct nft_expr_info info;
1713 struct nft_expr *expr;
1714 int err;
1715
1716 err = nf_tables_expr_parse(ctx, nla, &info);
1717 if (err < 0)
1718 goto err1;
1719
1720 err = -ENOMEM;
1721 expr = kzalloc(info.ops->size, GFP_KERNEL);
1722 if (expr == NULL)
1723 goto err2;
1724
1725 err = nf_tables_newexpr(ctx, &info, expr);
1726 if (err < 0)
1727 goto err2;
1728
1729 return expr;
1730err2:
1731 module_put(info.ops->type->owner);
1732err1:
1733 return ERR_PTR(err);
1734}
1735
1736void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1737{
1738 nf_tables_expr_destroy(ctx, expr);
1739 kfree(expr);
1740}
1741
96518518
PM		 1742/*
1743 * Rules
1744 */
1745
1746static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1747 u64 handle)
1748{
1749 struct nft_rule *rule;
1750
1751 // FIXME: this sucks
1752 list_for_each_entry(rule, &chain->rules, list) {
1753 if (handle == rule->handle)
1754 return rule;
1755 }
1756
1757 return ERR_PTR(-ENOENT);
1758}
1759
1760static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1761 const struct nlattr *nla)
1762{
1763 if (nla == NULL)
1764 return ERR_PTR(-EINVAL);
1765
1766 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1767}
1768
1769static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1770 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1771 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1772 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1773 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1774 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
0ca743a5 1775 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
5e948466 1776 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
0768b3b3
PNA		 1777 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1778 .len = NFT_USERDATA_MAXLEN },
96518518
PM		 1779};
1780
84d7fce6
PNA		 1781static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1782 u32 portid, u32 seq, int event,
1783 u32 flags, int family,
96518518
PM		 1784 const struct nft_table *table,
1785 const struct nft_chain *chain,
1786 const struct nft_rule *rule)
1787{
1788 struct nlmsghdr *nlh;
1789 struct nfgenmsg *nfmsg;
1790 const struct nft_expr *expr, *next;
1791 struct nlattr *list;
5e948466
EL		 1792 const struct nft_rule *prule;
1793 int type = event | NFNL_SUBSYS_NFTABLES << 8;
96518518 1794
5e948466 1795 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
96518518
PM		 1796 flags);
1797 if (nlh == NULL)
1798 goto nla_put_failure;
1799
1800 nfmsg = nlmsg_data(nlh);
1801 nfmsg->nfgen_family = family;
1802 nfmsg->version = NFNETLINK_V0;
84d7fce6 1803 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 1804
1805 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1806 goto nla_put_failure;
1807 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1808 goto nla_put_failure;
b46f6ded
ND		 1809 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1810 NFTA_RULE_PAD))
96518518
PM		 1811 goto nla_put_failure;
1812
5e948466
EL		 1813 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1814 prule = list_entry(rule->list.prev, struct nft_rule, list);
1815 if (nla_put_be64(skb, NFTA_RULE_POSITION,
b46f6ded
ND		 1816 cpu_to_be64(prule->handle),
1817 NFTA_RULE_PAD))
5e948466
EL		 1818 goto nla_put_failure;
1819 }
1820
96518518
PM		 1821 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1822 if (list == NULL)
1823 goto nla_put_failure;
1824 nft_rule_for_each_expr(expr, next, rule) {
0b2d8a7b 1825 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
96518518 1826 goto nla_put_failure;
96518518
PM		 1827 }
1828 nla_nest_end(skb, list);
1829
86f1ec32
PM		 1830 if (rule->udata) {
1831 struct nft_userdata *udata = nft_userdata(rule);
1832 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1833 udata->data) < 0)
1834 goto nla_put_failure;
1835 }
0768b3b3 1836
053c095a
JB		 1837 nlmsg_end(skb, nlh);
1838 return 0;
96518518
PM		 1839
1840nla_put_failure:
1841 nlmsg_trim(skb, nlh);
1842 return -1;
1843}
1844
35151d84 1845static int nf_tables_rule_notify(const struct nft_ctx *ctx,
96518518 1846 const struct nft_rule *rule,
35151d84 1847 int event)
96518518
PM		 1848{
1849 struct sk_buff *skb;
96518518
PM		 1850 int err;
1851
128ad332
PNA		 1852 if (!ctx->report &&
1853 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
96518518
PM		 1854 return 0;
1855
1856 err = -ENOBUFS;
1857 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1858 if (skb == NULL)
1859 goto err;
1860
84d7fce6
PNA		 1861 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1862 event, 0, ctx->afi->family, ctx->table,
35151d84 1863 ctx->chain, rule);
96518518
PM		 1864 if (err < 0) {
1865 kfree_skb(skb);
1866 goto err;
1867 }
1868
128ad332
PNA		 1869 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1870 ctx->report, GFP_KERNEL);
96518518 1871err:
128ad332
PNA		 1872 if (err < 0) {
1873 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1874 err);
1875 }
96518518
PM		 1876 return err;
1877}
1878
1879static int nf_tables_dump_rules(struct sk_buff *skb,
1880 struct netlink_callback *cb)
1881{
1882 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1883 const struct nft_af_info *afi;
1884 const struct nft_table *table;
1885 const struct nft_chain *chain;
1886 const struct nft_rule *rule;
1887 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1888 struct net *net = sock_net(skb->sk);
96518518
PM		 1889 int family = nfmsg->nfgen_family;
1890
e688a7f8 1891 rcu_read_lock();
38e029f1
PNA		 1892 cb->seq = net->nft.base_seq;
1893
e688a7f8 1894 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 1895 if (family != NFPROTO_UNSPEC && family != afi->family)
1896 continue;
1897
e688a7f8
PNA		 1898 list_for_each_entry_rcu(table, &afi->tables, list) {
1899 list_for_each_entry_rcu(chain, &table->chains, list) {
1900 list_for_each_entry_rcu(rule, &chain->rules, list) {
0628b123
PNA		 1901 if (!nft_rule_is_active(net, rule))
1902 goto cont;
96518518
PM		 1903 if (idx < s_idx)
1904 goto cont;
1905 if (idx > s_idx)
1906 memset(&cb->args[1], 0,
1907 sizeof(cb->args) - sizeof(cb->args[0]));
84d7fce6 1908 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
96518518
PM		 1909 cb->nlh->nlmsg_seq,
1910 NFT_MSG_NEWRULE,
1911 NLM_F_MULTI | NLM_F_APPEND,
1912 afi->family, table, chain, rule) < 0)
1913 goto done;
38e029f1
PNA		 1914
1915 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 1916cont:
1917 idx++;
1918 }
1919 }
1920 }
1921 }
1922done:
e688a7f8
PNA		 1923 rcu_read_unlock();
1924
96518518
PM		 1925 cb->args[0] = idx;
1926 return skb->len;
1927}
1928
7b8002a1
PNA		 1929static int nf_tables_getrule(struct net *net, struct sock *nlsk,
1930 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 1931 const struct nlattr * const nla[])
1932{
1933 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1934 const struct nft_af_info *afi;
1935 const struct nft_table *table;
1936 const struct nft_chain *chain;
1937 const struct nft_rule *rule;
1938 struct sk_buff *skb2;
1939 int family = nfmsg->nfgen_family;
1940 int err;
1941
1942 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1943 struct netlink_dump_control c = {
1944 .dump = nf_tables_dump_rules,
1945 };
1946 return netlink_dump_start(nlsk, skb, nlh, &c);
1947 }
1948
99633ab2 1949 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1950 if (IS_ERR(afi))
1951 return PTR_ERR(afi);
1952
9370761c 1953 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
96518518
PM		 1954 if (IS_ERR(table))
1955 return PTR_ERR(table);
55dd6f93
PNA		 1956 if (table->flags & NFT_TABLE_INACTIVE)
1957 return -ENOENT;
96518518
PM		 1958
1959 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1960 if (IS_ERR(chain))
1961 return PTR_ERR(chain);
91c7b38d
PNA		 1962 if (chain->flags & NFT_CHAIN_INACTIVE)
1963 return -ENOENT;
96518518
PM		 1964
1965 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1966 if (IS_ERR(rule))
1967 return PTR_ERR(rule);
1968
1969 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1970 if (!skb2)
1971 return -ENOMEM;
1972
84d7fce6 1973 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 1974 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1975 family, table, chain, rule);
1976 if (err < 0)
1977 goto err;
1978
1979 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1980
1981err:
1982 kfree_skb(skb2);
1983 return err;
1984}
1985
62472bce
PM		 1986static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1987 struct nft_rule *rule)
96518518 1988{
96518518
PM		 1989 struct nft_expr *expr;
1990
1991 /*
1992 * Careful: some expressions might not be initialized in case this
1993 * is called on error from nf_tables_newrule().
1994 */
1995 expr = nft_expr_first(rule);
1996 while (expr->ops && expr != nft_expr_last(rule)) {
62472bce 1997 nf_tables_expr_destroy(ctx, expr);
96518518
PM		 1998 expr = nft_expr_next(expr);
1999 }
2000 kfree(rule);
2001}
2002
1081d11b
PNA		 2003#define NFT_RULE_MAXEXPRS 128
2004
2005static struct nft_expr_info *info;
2006
633c9a84
PNA		 2007static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2008 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 2009 const struct nlattr * const nla[])
2010{
2011 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8 2012 struct nft_af_info *afi;
96518518
PM		 2013 struct nft_table *table;
2014 struct nft_chain *chain;
2015 struct nft_rule *rule, *old_rule = NULL;
86f1ec32 2016 struct nft_userdata *udata;
1081d11b 2017 struct nft_trans *trans = NULL;
96518518
PM		 2018 struct nft_expr *expr;
2019 struct nft_ctx ctx;
2020 struct nlattr *tmp;
86f1ec32 2021 unsigned int size, i, n, ulen = 0, usize = 0;
96518518
PM		 2022 int err, rem;
2023 bool create;
5e948466 2024 u64 handle, pos_handle;
96518518
PM		 2025
2026 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2027
99633ab2 2028 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
96518518
PM		 2029 if (IS_ERR(afi))
2030 return PTR_ERR(afi);
2031
9370761c 2032 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
96518518
PM		 2033 if (IS_ERR(table))
2034 return PTR_ERR(table);
2035
2036 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2037 if (IS_ERR(chain))
2038 return PTR_ERR(chain);
2039
2040 if (nla[NFTA_RULE_HANDLE]) {
2041 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2042 rule = __nf_tables_rule_lookup(chain, handle);
2043 if (IS_ERR(rule))
2044 return PTR_ERR(rule);
2045
2046 if (nlh->nlmsg_flags & NLM_F_EXCL)
2047 return -EEXIST;
2048 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2049 old_rule = rule;
2050 else
2051 return -EOPNOTSUPP;
2052 } else {
2053 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2054 return -EINVAL;
2055 handle = nf_tables_alloc_handle(table);
a0a7379e
PNA		 2056
2057 if (chain->use == UINT_MAX)
2058 return -EOVERFLOW;
96518518
PM		 2059 }
2060
5e948466
EL		 2061 if (nla[NFTA_RULE_POSITION]) {
2062 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2063 return -EOPNOTSUPP;
2064
2065 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2066 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2067 if (IS_ERR(old_rule))
2068 return PTR_ERR(old_rule);
2069 }
2070
633c9a84 2071 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0ca743a5 2072
96518518
PM		 2073 n = 0;
2074 size = 0;
2075 if (nla[NFTA_RULE_EXPRESSIONS]) {
2076 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2077 err = -EINVAL;
2078 if (nla_type(tmp) != NFTA_LIST_ELEM)
2079 goto err1;
2080 if (n == NFT_RULE_MAXEXPRS)
2081 goto err1;
0ca743a5 2082 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
96518518
PM		 2083 if (err < 0)
2084 goto err1;
2085 size += info[n].ops->size;
2086 n++;
2087 }
2088 }
9889840f
PM		 2089 /* Check for overflow of dlen field */
2090 err = -EFBIG;
2091 if (size >= 1 << 12)
2092 goto err1;
96518518 2093
86f1ec32 2094 if (nla[NFTA_RULE_USERDATA]) {
0768b3b3 2095 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
86f1ec32
PM		 2096 if (ulen > 0)
2097 usize = sizeof(struct nft_userdata) + ulen;
2098 }
0768b3b3 2099
96518518 2100 err = -ENOMEM;
86f1ec32 2101 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
96518518
PM		 2102 if (rule == NULL)
2103 goto err1;
2104
0628b123
PNA		 2105 nft_rule_activate_next(net, rule);
2106
96518518
PM		 2107 rule->handle = handle;
2108 rule->dlen = size;
86f1ec32 2109 rule->udata = ulen ? 1 : 0;
0768b3b3 2110
86f1ec32
PM		 2111 if (ulen) {
2112 udata = nft_userdata(rule);
2113 udata->len = ulen - 1;
2114 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2115 }
96518518 2116
96518518
PM		 2117 expr = nft_expr_first(rule);
2118 for (i = 0; i < n; i++) {
2119 err = nf_tables_newexpr(&ctx, &info[i], expr);
2120 if (err < 0)
2121 goto err2;
ef1f7df9 2122 info[i].ops = NULL;
96518518
PM		 2123 expr = nft_expr_next(expr);
2124 }
2125
96518518 2126 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
0628b123 2127 if (nft_rule_is_active_next(net, old_rule)) {
ac904ac8 2128 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
b380e5c7 2129 old_rule);
1081d11b 2130 if (trans == NULL) {
0628b123
PNA		 2131 err = -ENOMEM;
2132 goto err2;
2133 }
ee01d542 2134 nft_rule_deactivate_next(net, old_rule);
ac34b861 2135 chain->use--;
5bc5c307 2136 list_add_tail_rcu(&rule->list, &old_rule->list);
0628b123
PNA		 2137 } else {
2138 err = -ENOENT;
2139 goto err2;
2140 }
96518518 2141 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
5e948466
EL		 2142 if (old_rule)
2143 list_add_rcu(&rule->list, &old_rule->list);
2144 else
2145 list_add_tail_rcu(&rule->list, &chain->rules);
2146 else {
2147 if (old_rule)
2148 list_add_tail_rcu(&rule->list, &old_rule->list);
2149 else
2150 list_add_rcu(&rule->list, &chain->rules);
2151 }
96518518 2152
b380e5c7 2153 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
0628b123
PNA		 2154 err = -ENOMEM;
2155 goto err3;
2156 }
4fefee57 2157 chain->use++;
96518518
PM		 2158 return 0;
2159
0628b123
PNA		 2160err3:
2161 list_del_rcu(&rule->list);
96518518 2162err2:
62472bce 2163 nf_tables_rule_destroy(&ctx, rule);
96518518
PM		 2164err1:
2165 for (i = 0; i < n; i++) {
2166 if (info[i].ops != NULL)
ef1f7df9 2167 module_put(info[i].ops->type->owner);
96518518
PM		 2168 }
2169 return err;
2170}
2171
633c9a84
PNA		 2172static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2173 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 2174 const struct nlattr * const nla[])
2175{
2176 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8 2177 struct nft_af_info *afi;
7c95f6d8 2178 struct nft_table *table;
cf9dc09d
PNA		 2179 struct nft_chain *chain = NULL;
2180 struct nft_rule *rule;
0628b123
PNA		 2181 int family = nfmsg->nfgen_family, err = 0;
2182 struct nft_ctx ctx;
96518518 2183
99633ab2 2184 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 2185 if (IS_ERR(afi))
2186 return PTR_ERR(afi);
2187
9370761c 2188 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
96518518
PM		 2189 if (IS_ERR(table))
2190 return PTR_ERR(table);
2191
cf9dc09d
PNA		 2192 if (nla[NFTA_RULE_CHAIN]) {
2193 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2194 if (IS_ERR(chain))
2195 return PTR_ERR(chain);
2196 }
96518518 2197
633c9a84 2198 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0628b123 2199
cf9dc09d
PNA		 2200 if (chain) {
2201 if (nla[NFTA_RULE_HANDLE]) {
2202 rule = nf_tables_rule_lookup(chain,
2203 nla[NFTA_RULE_HANDLE]);
2204 if (IS_ERR(rule))
2205 return PTR_ERR(rule);
96518518 2206
5e266fe7 2207 err = nft_delrule(&ctx, rule);
cf9dc09d 2208 } else {
ce24b721 2209 err = nft_delrule_by_chain(&ctx);
cf9dc09d
PNA		 2210 }
2211 } else {
2212 list_for_each_entry(chain, &table->chains, list) {
2213 ctx.chain = chain;
ce24b721 2214 err = nft_delrule_by_chain(&ctx);
0628b123
PNA		 2215 if (err < 0)
2216 break;
2217 }
2218 }
2219
2220 return err;
2221}
2222
20a69341
PM		 2223/*
2224 * Sets
2225 */
2226
2227static LIST_HEAD(nf_tables_set_ops);
2228
2229int nft_register_set(struct nft_set_ops *ops)
2230{
2231 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2232 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
20a69341
PM		 2233 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2234 return 0;
2235}
2236EXPORT_SYMBOL_GPL(nft_register_set);
2237
2238void nft_unregister_set(struct nft_set_ops *ops)
2239{
2240 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2241 list_del_rcu(&ops->list);
20a69341
PM		 2242 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2243}
2244EXPORT_SYMBOL_GPL(nft_unregister_set);
2245
c50b960c
PM		 2246/*
2247 * Select a set implementation based on the data characteristics and the
2248 * given policy. The total memory use might not be known if no size is
2249 * given, in that case the amount of memory per element is used.
2250 */
2251static const struct nft_set_ops *
2252nft_select_set_ops(const struct nlattr * const nla[],
2253 const struct nft_set_desc *desc,
2254 enum nft_set_policies policy)
20a69341 2255{
c50b960c
PM		 2256 const struct nft_set_ops *ops, *bops;
2257 struct nft_set_estimate est, best;
20a69341
PM		 2258 u32 features;
2259
2260#ifdef CONFIG_MODULES
2261 if (list_empty(&nf_tables_set_ops)) {
2262 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2263 request_module("nft-set");
2264 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2265 if (!list_empty(&nf_tables_set_ops))
2266 return ERR_PTR(-EAGAIN);
2267 }
2268#endif
2269 features = 0;
2270 if (nla[NFTA_SET_FLAGS] != NULL) {
2271 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4a8678ef 2272 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT;
20a69341
PM		 2273 }
2274
c50b960c
PM		 2275 bops = NULL;
2276 best.size = ~0;
2277 best.class = ~0;
2278
20a69341
PM		 2279 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2280 if ((ops->features & features) != features)
2281 continue;
c50b960c
PM		 2282 if (!ops->estimate(desc, features, &est))
2283 continue;
2284
2285 switch (policy) {
2286 case NFT_SET_POL_PERFORMANCE:
2287 if (est.class < best.class)
2288 break;
2289 if (est.class == best.class && est.size < best.size)
2290 break;
2291 continue;
2292 case NFT_SET_POL_MEMORY:
2293 if (est.size < best.size)
2294 break;
2295 if (est.size == best.size && est.class < best.class)
2296 break;
2297 continue;
2298 default:
2299 break;
2300 }
2301
20a69341
PM		 2302 if (!try_module_get(ops->owner))
2303 continue;
c50b960c
PM		 2304 if (bops != NULL)
2305 module_put(bops->owner);
2306
2307 bops = ops;
2308 best = est;
20a69341
PM		 2309 }
2310
c50b960c
PM		 2311 if (bops != NULL)
2312 return bops;
2313
20a69341
PM		 2314 return ERR_PTR(-EOPNOTSUPP);
2315}
2316
2317static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2318 [NFTA_SET_TABLE] = { .type = NLA_STRING },
a9bdd836
PNA		 2319 [NFTA_SET_NAME] = { .type = NLA_STRING,
2320 .len = IFNAMSIZ - 1 },
20a69341
PM		 2321 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2322 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2323 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2324 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2325 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
c50b960c
PM		 2326 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2327 [NFTA_SET_DESC] = { .type = NLA_NESTED },
958bee14 2328 [NFTA_SET_ID] = { .type = NLA_U32 },
761da293
PM		 2329 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2330 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
e6d8ecac
CFG		 2331 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2332 .len = NFT_USERDATA_MAXLEN },
c50b960c
PM		 2333};
2334
2335static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2336 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
20a69341
PM		 2337};
2338
633c9a84 2339static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 2340 const struct sk_buff *skb,
2341 const struct nlmsghdr *nlh,
2342 const struct nlattr * const nla[])
2343{
2344 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 2345 struct nft_af_info *afi = NULL;
2346 struct nft_table *table = NULL;
20a69341 2347
c9c8e485
PNA		 2348 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2349 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2350 if (IS_ERR(afi))
2351 return PTR_ERR(afi);
2352 }
20a69341
PM		 2353
2354 if (nla[NFTA_SET_TABLE] != NULL) {
ec2c9935
PM		 2355 if (afi == NULL)
2356 return -EAFNOSUPPORT;
2357
9370761c 2358 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
20a69341
PM		 2359 if (IS_ERR(table))
2360 return PTR_ERR(table);
2361 }
2362
633c9a84 2363 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 2364 return 0;
2365}
2366
2367struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2368 const struct nlattr *nla)
2369{
2370 struct nft_set *set;
2371
2372 if (nla == NULL)
2373 return ERR_PTR(-EINVAL);
2374
2375 list_for_each_entry(set, &table->sets, list) {
2376 if (!nla_strcmp(nla, set->name))
2377 return set;
2378 }
2379 return ERR_PTR(-ENOENT);
2380}
2381
958bee14
PNA		 2382struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2383 const struct nlattr *nla)
2384{
2385 struct nft_trans *trans;
2386 u32 id = ntohl(nla_get_be32(nla));
2387
2388 list_for_each_entry(trans, &net->nft.commit_list, list) {
2389 if (trans->msg_type == NFT_MSG_NEWSET &&
2390 id == nft_trans_set_id(trans))
2391 return nft_trans_set(trans);
2392 }
2393 return ERR_PTR(-ENOENT);
2394}
2395
20a69341
PM		 2396static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2397 const char *name)
2398{
2399 const struct nft_set *i;
2400 const char *p;
2401 unsigned long *inuse;
60eb1894 2402 unsigned int n = 0, min = 0;
20a69341
PM		 2403
2404 p = strnchr(name, IFNAMSIZ, '%');
2405 if (p != NULL) {
2406 if (p[1] != 'd' || strchr(p + 2, '%'))
2407 return -EINVAL;
2408
2409 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2410 if (inuse == NULL)
2411 return -ENOMEM;
60eb1894 2412cont:
20a69341 2413 list_for_each_entry(i, &ctx->table->sets, list) {
14662917
DB		 2414 int tmp;
2415
2416 if (!sscanf(i->name, name, &tmp))
20a69341 2417 continue;
60eb1894 2418 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
20a69341 2419 continue;
14662917 2420
60eb1894 2421 set_bit(tmp - min, inuse);
20a69341
PM		 2422 }
2423
53b70287 2424 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
60eb1894
PM		 2425 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2426 min += BITS_PER_BYTE * PAGE_SIZE;
2427 memset(inuse, 0, PAGE_SIZE);
2428 goto cont;
2429 }
20a69341
PM		 2430 free_page((unsigned long)inuse);
2431 }
2432
60eb1894 2433 snprintf(set->name, sizeof(set->name), name, min + n);
20a69341
PM		 2434 list_for_each_entry(i, &ctx->table->sets, list) {
2435 if (!strcmp(set->name, i->name))
2436 return -ENFILE;
2437 }
2438 return 0;
2439}
2440
2441static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2442 const struct nft_set *set, u16 event, u16 flags)
2443{
2444 struct nfgenmsg *nfmsg;
2445 struct nlmsghdr *nlh;
c50b960c 2446 struct nlattr *desc;
128ad332
PNA		 2447 u32 portid = ctx->portid;
2448 u32 seq = ctx->seq;
20a69341
PM		 2449
2450 event |= NFNL_SUBSYS_NFTABLES << 8;
2451 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2452 flags);
2453 if (nlh == NULL)
2454 goto nla_put_failure;
2455
2456 nfmsg = nlmsg_data(nlh);
2457 nfmsg->nfgen_family = ctx->afi->family;
2458 nfmsg->version = NFNETLINK_V0;
84d7fce6 2459 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
20a69341
PM		 2460
2461 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2462 goto nla_put_failure;
2463 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2464 goto nla_put_failure;
2465 if (set->flags != 0)
2466 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2467 goto nla_put_failure;
2468
2469 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2470 goto nla_put_failure;
2471 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2472 goto nla_put_failure;
2473 if (set->flags & NFT_SET_MAP) {
2474 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2475 goto nla_put_failure;
2476 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2477 goto nla_put_failure;
2478 }
2479
761da293 2480 if (set->timeout &&
b46f6ded
ND		 2481 nla_put_be64(skb, NFTA_SET_TIMEOUT, cpu_to_be64(set->timeout),
2482 NFTA_SET_PAD))
761da293
PM		 2483 goto nla_put_failure;
2484 if (set->gc_int &&
2485 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2486 goto nla_put_failure;
2487
9363dc4b
AB		 2488 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2489 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2490 goto nla_put_failure;
2491 }
2492
e6d8ecac
CFG		 2493 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2494 goto nla_put_failure;
2495
c50b960c
PM		 2496 desc = nla_nest_start(skb, NFTA_SET_DESC);
2497 if (desc == NULL)
2498 goto nla_put_failure;
2499 if (set->size &&
2500 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2501 goto nla_put_failure;
2502 nla_nest_end(skb, desc);
2503
053c095a
JB		 2504 nlmsg_end(skb, nlh);
2505 return 0;
20a69341
PM		 2506
2507nla_put_failure:
2508 nlmsg_trim(skb, nlh);
2509 return -1;
2510}
2511
2512static int nf_tables_set_notify(const struct nft_ctx *ctx,
2513 const struct nft_set *set,
31f8441c 2514 int event, gfp_t gfp_flags)
20a69341
PM		 2515{
2516 struct sk_buff *skb;
128ad332 2517 u32 portid = ctx->portid;
20a69341
PM		 2518 int err;
2519
128ad332
PNA		 2520 if (!ctx->report &&
2521 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
20a69341
PM		 2522 return 0;
2523
2524 err = -ENOBUFS;
31f8441c 2525 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
20a69341
PM		 2526 if (skb == NULL)
2527 goto err;
2528
2529 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2530 if (err < 0) {
2531 kfree_skb(skb);
2532 goto err;
2533 }
2534
128ad332 2535 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
31f8441c 2536 ctx->report, gfp_flags);
20a69341
PM		 2537err:
2538 if (err < 0)
99633ab2 2539 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
20a69341
PM		 2540 return err;
2541}
2542
5b96af77 2543static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
c9c8e485
PNA		 2544{
2545 const struct nft_set *set;
2546 unsigned int idx, s_idx = cb->args[0];
7c95f6d8 2547 struct nft_af_info *afi;
c9c8e485
PNA		 2548 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2549 struct net *net = sock_net(skb->sk);
2550 int cur_family = cb->args[3];
5b96af77 2551 struct nft_ctx *ctx = cb->data, ctx_set;
c9c8e485
PNA		 2552
2553 if (cb->args[1])
2554 return skb->len;
2555
e688a7f8 2556 rcu_read_lock();
38e029f1
PNA		 2557 cb->seq = net->nft.base_seq;
2558
e688a7f8 2559 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
5b96af77
PNA		 2560 if (ctx->afi && ctx->afi != afi)
2561 continue;
2562
c9c8e485
PNA		 2563 if (cur_family) {
2564 if (afi->family != cur_family)
2565 continue;
2566
2567 cur_family = 0;
2568 }
e688a7f8 2569 list_for_each_entry_rcu(table, &afi->tables, list) {
5b96af77
PNA		 2570 if (ctx->table && ctx->table != table)
2571 continue;
2572
c9c8e485
PNA		 2573 if (cur_table) {
2574 if (cur_table != table)
2575 continue;
2576
2577 cur_table = NULL;
2578 }
c9c8e485 2579 idx = 0;
5b96af77 2580 list_for_each_entry_rcu(set, &table->sets, list) {
c9c8e485
PNA		 2581 if (idx < s_idx)
2582 goto cont;
5b96af77
PNA		 2583
2584 ctx_set = *ctx;
2585 ctx_set.table = table;
2586 ctx_set.afi = afi;
2587 if (nf_tables_fill_set(skb, &ctx_set, set,
c9c8e485
PNA		 2588 NFT_MSG_NEWSET,
2589 NLM_F_MULTI) < 0) {
2590 cb->args[0] = idx;
2591 cb->args[2] = (unsigned long) table;
2592 cb->args[3] = afi->family;
2593 goto done;
2594 }
38e029f1 2595 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
c9c8e485
PNA		 2596cont:
2597 idx++;
2598 }
2599 if (s_idx)
2600 s_idx = 0;
2601 }
2602 }
2603 cb->args[1] = 1;
2604done:
e688a7f8 2605 rcu_read_unlock();
c9c8e485
PNA		 2606 return skb->len;
2607}
2608
5b96af77 2609static int nf_tables_dump_sets_done(struct netlink_callback *cb)
20a69341 2610{
5b96af77
PNA		 2611 kfree(cb->data);
2612 return 0;
20a69341
PM		 2613}
2614
7b8002a1
PNA		 2615static int nf_tables_getset(struct net *net, struct sock *nlsk,
2616 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 2617 const struct nlattr * const nla[])
2618{
2619 const struct nft_set *set;
2620 struct nft_ctx ctx;
2621 struct sk_buff *skb2;
c9c8e485 2622 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 2623 int err;
2624
01cfa0a4 2625 /* Verify existence before starting dump */
633c9a84 2626 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla);
20a69341
PM		 2627 if (err < 0)
2628 return err;
2629
2630 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2631 struct netlink_dump_control c = {
2632 .dump = nf_tables_dump_sets,
5b96af77 2633 .done = nf_tables_dump_sets_done,
20a69341 2634 };
5b96af77
PNA		 2635 struct nft_ctx *ctx_dump;
2636
2637 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2638 if (ctx_dump == NULL)
2639 return -ENOMEM;
2640
2641 *ctx_dump = ctx;
2642 c.data = ctx_dump;
2643
20a69341
PM		 2644 return netlink_dump_start(nlsk, skb, nlh, &c);
2645 }
2646
c9c8e485
PNA		 2647 /* Only accept unspec with dump */
2648 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2649 return -EAFNOSUPPORT;
2650
20a69341
PM		 2651 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2652 if (IS_ERR(set))
2653 return PTR_ERR(set);
958bee14
PNA		 2654 if (set->flags & NFT_SET_INACTIVE)
2655 return -ENOENT;
20a69341
PM		 2656
2657 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2658 if (skb2 == NULL)
2659 return -ENOMEM;
2660
2661 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2662 if (err < 0)
2663 goto err;
2664
2665 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2666
2667err:
2668 kfree_skb(skb2);
2669 return err;
2670}
2671
c50b960c
PM		 2672static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2673 struct nft_set_desc *desc,
2674 const struct nlattr *nla)
2675{
2676 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2677 int err;
2678
2679 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2680 if (err < 0)
2681 return err;
2682
2683 if (da[NFTA_SET_DESC_SIZE] != NULL)
2684 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2685
2686 return 0;
2687}
2688
633c9a84
PNA		 2689static int nf_tables_newset(struct net *net, struct sock *nlsk,
2690 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 2691 const struct nlattr * const nla[])
2692{
2693 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2694 const struct nft_set_ops *ops;
7c95f6d8 2695 struct nft_af_info *afi;
20a69341
PM		 2696 struct nft_table *table;
2697 struct nft_set *set;
2698 struct nft_ctx ctx;
2699 char name[IFNAMSIZ];
2700 unsigned int size;
2701 bool create;
761da293
PM		 2702 u64 timeout;
2703 u32 ktype, dtype, flags, policy, gc_int;
c50b960c 2704 struct nft_set_desc desc;
e6d8ecac
CFG		 2705 unsigned char *udata;
2706 u16 udlen;
20a69341
PM		 2707 int err;
2708
2709 if (nla[NFTA_SET_TABLE] == NULL ||
2710 nla[NFTA_SET_NAME] == NULL ||
958bee14
PNA		 2711 nla[NFTA_SET_KEY_LEN] == NULL ||
2712 nla[NFTA_SET_ID] == NULL)
20a69341
PM		 2713 return -EINVAL;
2714
c50b960c
PM		 2715 memset(&desc, 0, sizeof(desc));
2716
20a69341
PM		 2717 ktype = NFT_DATA_VALUE;
2718 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2719 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2720 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2721 return -EINVAL;
2722 }
2723
c50b960c 2724 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
7d740264 2725 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 2726 return -EINVAL;
2727
2728 flags = 0;
2729 if (nla[NFTA_SET_FLAGS] != NULL) {
2730 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2731 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
7c6c6e95
PM		 2732 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2733 NFT_SET_MAP | NFT_SET_EVAL))
20a69341 2734 return -EINVAL;
7c6c6e95
PM		 2735 /* Only one of both operations is supported */
2736 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL)) ==
2737 (NFT_SET_MAP | NFT_SET_EVAL))
2738 return -EOPNOTSUPP;
20a69341
PM		 2739 }
2740
2741 dtype = 0;
20a69341
PM		 2742 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2743 if (!(flags & NFT_SET_MAP))
2744 return -EINVAL;
2745
2746 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2747 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2748 dtype != NFT_DATA_VERDICT)
2749 return -EINVAL;
2750
2751 if (dtype != NFT_DATA_VERDICT) {
2752 if (nla[NFTA_SET_DATA_LEN] == NULL)
2753 return -EINVAL;
c50b960c 2754 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
7d740264 2755 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 2756 return -EINVAL;
2757 } else
7d740264 2758 desc.dlen = sizeof(struct nft_verdict);
20a69341
PM		 2759 } else if (flags & NFT_SET_MAP)
2760 return -EINVAL;
2761
761da293
PM		 2762 timeout = 0;
2763 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2764 if (!(flags & NFT_SET_TIMEOUT))
2765 return -EINVAL;
2766 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_TIMEOUT]));
2767 }
2768 gc_int = 0;
2769 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2770 if (!(flags & NFT_SET_TIMEOUT))
2771 return -EINVAL;
2772 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2773 }
2774
c50b960c
PM		 2775 policy = NFT_SET_POL_PERFORMANCE;
2776 if (nla[NFTA_SET_POLICY] != NULL)
2777 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2778
2779 if (nla[NFTA_SET_DESC] != NULL) {
2780 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2781 if (err < 0)
2782 return err;
2783 }
2784
20a69341
PM		 2785 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2786
99633ab2 2787 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
20a69341
PM		 2788 if (IS_ERR(afi))
2789 return PTR_ERR(afi);
2790
9370761c 2791 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
20a69341
PM		 2792 if (IS_ERR(table))
2793 return PTR_ERR(table);
2794
633c9a84 2795 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 2796
2797 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2798 if (IS_ERR(set)) {
2799 if (PTR_ERR(set) != -ENOENT)
2800 return PTR_ERR(set);
2801 set = NULL;
2802 }
2803
2804 if (set != NULL) {
2805 if (nlh->nlmsg_flags & NLM_F_EXCL)
2806 return -EEXIST;
2807 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2808 return -EOPNOTSUPP;
2809 return 0;
2810 }
2811
2812 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2813 return -ENOENT;
2814
c50b960c 2815 ops = nft_select_set_ops(nla, &desc, policy);
20a69341
PM		 2816 if (IS_ERR(ops))
2817 return PTR_ERR(ops);
2818
e6d8ecac
CFG		 2819 udlen = 0;
2820 if (nla[NFTA_SET_USERDATA])
2821 udlen = nla_len(nla[NFTA_SET_USERDATA]);
2822
20a69341
PM		 2823 size = 0;
2824 if (ops->privsize != NULL)
2825 size = ops->privsize(nla);
2826
2827 err = -ENOMEM;
e6d8ecac 2828 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
20a69341
PM		 2829 if (set == NULL)
2830 goto err1;
2831
2832 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2833 err = nf_tables_set_alloc_name(&ctx, set, name);
2834 if (err < 0)
2835 goto err2;
2836
e6d8ecac
CFG		 2837 udata = NULL;
2838 if (udlen) {
2839 udata = set->data + size;
2840 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
2841 }
2842
20a69341 2843 INIT_LIST_HEAD(&set->bindings);
cc02e457 2844 write_pnet(&set->pnet, net);
20a69341
PM		 2845 set->ops = ops;
2846 set->ktype = ktype;
c50b960c 2847 set->klen = desc.klen;
20a69341 2848 set->dtype = dtype;
c50b960c 2849 set->dlen = desc.dlen;
20a69341 2850 set->flags = flags;
c50b960c 2851 set->size = desc.size;
9363dc4b 2852 set->policy = policy;
e6d8ecac
CFG		 2853 set->udlen = udlen;
2854 set->udata = udata;
761da293
PM		 2855 set->timeout = timeout;
2856 set->gc_int = gc_int;
20a69341 2857
c50b960c 2858 err = ops->init(set, &desc, nla);
20a69341
PM		 2859 if (err < 0)
2860 goto err2;
2861
958bee14 2862 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
20a69341
PM		 2863 if (err < 0)
2864 goto err2;
2865
e688a7f8 2866 list_add_tail_rcu(&set->list, &table->sets);
4fefee57 2867 table->use++;
20a69341
PM		 2868 return 0;
2869
2870err2:
2871 kfree(set);
2872err1:
2873 module_put(ops->owner);
2874 return err;
2875}
2876
958bee14 2877static void nft_set_destroy(struct nft_set *set)
20a69341 2878{
20a69341
PM		 2879 set->ops->destroy(set);
2880 module_put(set->ops->owner);
2881 kfree(set);
2882}
2883
958bee14
PNA		 2884static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2885{
e688a7f8 2886 list_del_rcu(&set->list);
31f8441c 2887 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
958bee14
PNA		 2888 nft_set_destroy(set);
2889}
2890
633c9a84
PNA		 2891static int nf_tables_delset(struct net *net, struct sock *nlsk,
2892 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 2893 const struct nlattr * const nla[])
2894{
c9c8e485 2895 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 2896 struct nft_set *set;
2897 struct nft_ctx ctx;
2898 int err;
2899
ec2c9935
PM		 2900 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2901 return -EAFNOSUPPORT;
20a69341
PM		 2902 if (nla[NFTA_SET_TABLE] == NULL)
2903 return -EINVAL;
2904
633c9a84 2905 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla);
20a69341
PM		 2906 if (err < 0)
2907 return err;
2908
2909 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2910 if (IS_ERR(set))
2911 return PTR_ERR(set);
2912 if (!list_empty(&set->bindings))
2913 return -EBUSY;
2914
ee01d542 2915 return nft_delset(&ctx, set);
20a69341
PM		 2916}
2917
2918static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2919 const struct nft_set *set,
2920 const struct nft_set_iter *iter,
2921 const struct nft_set_elem *elem)
2922{
fe2811eb 2923 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 2924 enum nft_registers dreg;
2925
2926 dreg = nft_type_to_reg(set->dtype);
1ec10212
PM		 2927 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
2928 set->dtype == NFT_DATA_VERDICT ?
2929 NFT_DATA_VERDICT : NFT_DATA_VALUE,
2930 set->dlen);
20a69341
PM		 2931}
2932
2933int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2934 struct nft_set_binding *binding)
2935{
2936 struct nft_set_binding *i;
2937 struct nft_set_iter iter;
2938
2939 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2940 return -EBUSY;
2941
11113e19 2942 if (binding->flags & NFT_SET_MAP) {
20a69341
PM		 2943 /* If the set is already bound to the same chain all
2944 * jumps are already validated for that chain.
2945 */
2946 list_for_each_entry(i, &set->bindings, list) {
11113e19
PM		 2947 if (binding->flags & NFT_SET_MAP &&
2948 i->chain == binding->chain)
20a69341
PM		 2949 goto bind;
2950 }
2951
2952 iter.skip = 0;
2953 iter.count = 0;
2954 iter.err = 0;
2955 iter.fn = nf_tables_bind_check_setelem;
2956
2957 set->ops->walk(ctx, set, &iter);
2958 if (iter.err < 0) {
2959 /* Destroy anonymous sets if binding fails */
2960 if (set->flags & NFT_SET_ANONYMOUS)
2961 nf_tables_set_destroy(ctx, set);
2962
2963 return iter.err;
2964 }
2965 }
2966bind:
2967 binding->chain = ctx->chain;
e688a7f8 2968 list_add_tail_rcu(&binding->list, &set->bindings);
20a69341
PM		 2969 return 0;
2970}
2971
2972void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2973 struct nft_set_binding *binding)
2974{
e688a7f8 2975 list_del_rcu(&binding->list);
20a69341 2976
958bee14
PNA		 2977 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2978 !(set->flags & NFT_SET_INACTIVE))
20a69341
PM		 2979 nf_tables_set_destroy(ctx, set);
2980}
2981
3ac4c07a
PM		 2982const struct nft_set_ext_type nft_set_ext_types[] = {
2983 [NFT_SET_EXT_KEY] = {
7d740264 2984 .align = __alignof__(u32),
3ac4c07a
PM		 2985 },
2986 [NFT_SET_EXT_DATA] = {
7d740264 2987 .align = __alignof__(u32),
3ac4c07a 2988 },
f25ad2e9
PM		 2989 [NFT_SET_EXT_EXPR] = {
2990 .align = __alignof__(struct nft_expr),
2991 },
3ac4c07a
PM		 2992 [NFT_SET_EXT_FLAGS] = {
2993 .len = sizeof(u8),
2994 .align = __alignof__(u8),
2995 },
c3e1b005
PM		 2996 [NFT_SET_EXT_TIMEOUT] = {
2997 .len = sizeof(u64),
2998 .align = __alignof__(u64),
2999 },
3000 [NFT_SET_EXT_EXPIRATION] = {
3001 .len = sizeof(unsigned long),
3002 .align = __alignof__(unsigned long),
3003 },
68e942e8
PM		 3004 [NFT_SET_EXT_USERDATA] = {
3005 .len = sizeof(struct nft_userdata),
3006 .align = __alignof__(struct nft_userdata),
3007 },
3ac4c07a
PM		 3008};
3009EXPORT_SYMBOL_GPL(nft_set_ext_types);
3010
20a69341
PM		 3011/*
3012 * Set elements
3013 */
3014
3015static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3016 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3017 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3018 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
c3e1b005 3019 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
68e942e8
PM		 3020 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3021 .len = NFT_USERDATA_MAXLEN },
20a69341
PM		 3022};
3023
3024static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3025 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
3026 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
3027 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
958bee14 3028 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
20a69341
PM		 3029};
3030
633c9a84 3031static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 3032 const struct sk_buff *skb,
3033 const struct nlmsghdr *nlh,
f4c756b4 3034 const struct nlattr * const nla[])
20a69341
PM		 3035{
3036 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 3037 struct nft_af_info *afi;
3038 struct nft_table *table;
20a69341 3039
99633ab2 3040 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
20a69341
PM		 3041 if (IS_ERR(afi))
3042 return PTR_ERR(afi);
3043
9370761c 3044 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
20a69341
PM		 3045 if (IS_ERR(table))
3046 return PTR_ERR(table);
3047
633c9a84 3048 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 3049 return 0;
3050}
3051
3052static int nf_tables_fill_setelem(struct sk_buff *skb,
3053 const struct nft_set *set,
3054 const struct nft_set_elem *elem)
3055{
fe2811eb 3056 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 3057 unsigned char *b = skb_tail_pointer(skb);
3058 struct nlattr *nest;
3059
3060 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3061 if (nest == NULL)
3062 goto nla_put_failure;
3063
fe2811eb
PM		 3064 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3065 NFT_DATA_VALUE, set->klen) < 0)
20a69341
PM		 3066 goto nla_put_failure;
3067
fe2811eb
PM		 3068 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3069 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
20a69341
PM		 3070 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3071 set->dlen) < 0)
3072 goto nla_put_failure;
3073
f25ad2e9
PM		 3074 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3075 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3076 goto nla_put_failure;
3077
fe2811eb
PM		 3078 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3079 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3080 htonl(*nft_set_ext_flags(ext))))
3081 goto nla_put_failure;
20a69341 3082
c3e1b005
PM		 3083 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3084 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
b46f6ded
ND		 3085 cpu_to_be64(*nft_set_ext_timeout(ext)),
3086 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3087 goto nla_put_failure;
3088
3089 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3090 unsigned long expires, now = jiffies;
3091
3092 expires = *nft_set_ext_expiration(ext);
3093 if (time_before(now, expires))
3094 expires -= now;
3095 else
3096 expires = 0;
3097
3098 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
b46f6ded
ND		 3099 cpu_to_be64(jiffies_to_msecs(expires)),
3100 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3101 goto nla_put_failure;
3102 }
3103
68e942e8
PM		 3104 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3105 struct nft_userdata *udata;
3106
3107 udata = nft_set_ext_userdata(ext);
3108 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3109 udata->len + 1, udata->data))
3110 goto nla_put_failure;
3111 }
3112
20a69341
PM		 3113 nla_nest_end(skb, nest);
3114 return 0;
3115
3116nla_put_failure:
3117 nlmsg_trim(skb, b);
3118 return -EMSGSIZE;
3119}
3120
3121struct nft_set_dump_args {
3122 const struct netlink_callback *cb;
3123 struct nft_set_iter iter;
3124 struct sk_buff *skb;
3125};
3126
3127static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3128 const struct nft_set *set,
3129 const struct nft_set_iter *iter,
3130 const struct nft_set_elem *elem)
3131{
3132 struct nft_set_dump_args *args;
3133
3134 args = container_of(iter, struct nft_set_dump_args, iter);
3135 return nf_tables_fill_setelem(args->skb, set, elem);
3136}
3137
3138static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3139{
633c9a84 3140 struct net *net = sock_net(skb->sk);
20a69341
PM		 3141 const struct nft_set *set;
3142 struct nft_set_dump_args args;
3143 struct nft_ctx ctx;
3144 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3145 struct nfgenmsg *nfmsg;
3146 struct nlmsghdr *nlh;
3147 struct nlattr *nest;
3148 u32 portid, seq;
3149 int event, err;
3150
720e0dfa
MN		 3151 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3152 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
20a69341
PM		 3153 if (err < 0)
3154 return err;
3155
633c9a84 3156 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
f4c756b4 3157 (void *)nla);
20a69341
PM		 3158 if (err < 0)
3159 return err;
f4c756b4
PNA		 3160 if (ctx.table->flags & NFT_TABLE_INACTIVE)
3161 return -ENOENT;
20a69341
PM		 3162
3163 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3164 if (IS_ERR(set))
3165 return PTR_ERR(set);
958bee14
PNA		 3166 if (set->flags & NFT_SET_INACTIVE)
3167 return -ENOENT;
20a69341
PM		 3168
3169 event = NFT_MSG_NEWSETELEM;
3170 event |= NFNL_SUBSYS_NFTABLES << 8;
3171 portid = NETLINK_CB(cb->skb).portid;
3172 seq = cb->nlh->nlmsg_seq;
3173
3174 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3175 NLM_F_MULTI);
3176 if (nlh == NULL)
3177 goto nla_put_failure;
3178
3179 nfmsg = nlmsg_data(nlh);
6403d962 3180 nfmsg->nfgen_family = ctx.afi->family;
20a69341 3181 nfmsg->version = NFNETLINK_V0;
84d7fce6 3182 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
20a69341
PM		 3183
3184 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3185 goto nla_put_failure;
3186 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3187 goto nla_put_failure;
3188
3189 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3190 if (nest == NULL)
3191 goto nla_put_failure;
3192
3193 args.cb = cb;
3194 args.skb = skb;
3195 args.iter.skip = cb->args[0];
3196 args.iter.count = 0;
3197 args.iter.err = 0;
3198 args.iter.fn = nf_tables_dump_setelem;
3199 set->ops->walk(&ctx, set, &args.iter);
3200
3201 nla_nest_end(skb, nest);
3202 nlmsg_end(skb, nlh);
3203
3204 if (args.iter.err && args.iter.err != -EMSGSIZE)
3205 return args.iter.err;
3206 if (args.iter.count == cb->args[0])
3207 return 0;
3208
3209 cb->args[0] = args.iter.count;
3210 return skb->len;
3211
3212nla_put_failure:
3213 return -ENOSPC;
3214}
3215
7b8002a1
PNA		 3216static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3217 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3218 const struct nlattr * const nla[])
3219{
3220 const struct nft_set *set;
3221 struct nft_ctx ctx;
3222 int err;
3223
f4c756b4 3224 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla);
20a69341
PM		 3225 if (err < 0)
3226 return err;
f4c756b4
PNA		 3227 if (ctx.table->flags & NFT_TABLE_INACTIVE)
3228 return -ENOENT;
20a69341
PM		 3229
3230 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3231 if (IS_ERR(set))
3232 return PTR_ERR(set);
958bee14
PNA		 3233 if (set->flags & NFT_SET_INACTIVE)
3234 return -ENOENT;
20a69341
PM		 3235
3236 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3237 struct netlink_dump_control c = {
3238 .dump = nf_tables_dump_set,
3239 };
3240 return netlink_dump_start(nlsk, skb, nlh, &c);
3241 }
3242 return -EOPNOTSUPP;
3243}
3244
d60ce62f
AB		 3245static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3246 const struct nft_ctx *ctx, u32 seq,
3247 u32 portid, int event, u16 flags,
3248 const struct nft_set *set,
3249 const struct nft_set_elem *elem)
3250{
3251 struct nfgenmsg *nfmsg;
3252 struct nlmsghdr *nlh;
3253 struct nlattr *nest;
3254 int err;
3255
3256 event |= NFNL_SUBSYS_NFTABLES << 8;
3257 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3258 flags);
3259 if (nlh == NULL)
3260 goto nla_put_failure;
3261
3262 nfmsg = nlmsg_data(nlh);
3263 nfmsg->nfgen_family = ctx->afi->family;
3264 nfmsg->version = NFNETLINK_V0;
84d7fce6 3265 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
d60ce62f
AB		 3266
3267 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3268 goto nla_put_failure;
3269 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3270 goto nla_put_failure;
3271
3272 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3273 if (nest == NULL)
3274 goto nla_put_failure;
3275
3276 err = nf_tables_fill_setelem(skb, set, elem);
3277 if (err < 0)
3278 goto nla_put_failure;
3279
3280 nla_nest_end(skb, nest);
3281
053c095a
JB		 3282 nlmsg_end(skb, nlh);
3283 return 0;
d60ce62f
AB		 3284
3285nla_put_failure:
3286 nlmsg_trim(skb, nlh);
3287 return -1;
3288}
3289
3290static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3291 const struct nft_set *set,
3292 const struct nft_set_elem *elem,
3293 int event, u16 flags)
3294{
128ad332
PNA		 3295 struct net *net = ctx->net;
3296 u32 portid = ctx->portid;
d60ce62f
AB		 3297 struct sk_buff *skb;
3298 int err;
3299
128ad332 3300 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
d60ce62f
AB		 3301 return 0;
3302
3303 err = -ENOBUFS;
3304 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3305 if (skb == NULL)
3306 goto err;
3307
3308 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3309 set, elem);
3310 if (err < 0) {
3311 kfree_skb(skb);
3312 goto err;
3313 }
3314
128ad332 3315 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
d60ce62f
AB		 3316 GFP_KERNEL);
3317err:
3318 if (err < 0)
3319 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3320 return err;
3321}
3322
60319eb1
PNA		 3323static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3324 int msg_type,
3325 struct nft_set *set)
3326{
3327 struct nft_trans *trans;
3328
3329 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3330 if (trans == NULL)
3331 return NULL;
3332
3333 nft_trans_elem_set(trans) = set;
3334 return trans;
3335}
3336
22fe54d5
PM		 3337void *nft_set_elem_init(const struct nft_set *set,
3338 const struct nft_set_ext_tmpl *tmpl,
49499c3e 3339 const u32 *key, const u32 *data,
22fe54d5 3340 u64 timeout, gfp_t gfp)
fe2811eb
PM		 3341{
3342 struct nft_set_ext *ext;
3343 void *elem;
3344
3345 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3346 if (elem == NULL)
3347 return NULL;
3348
3349 ext = nft_set_elem_ext(set, elem);
3350 nft_set_ext_init(ext, tmpl);
3351
3352 memcpy(nft_set_ext_key(ext), key, set->klen);
3353 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3354 memcpy(nft_set_ext_data(ext), data, set->dlen);
c3e1b005
PM		 3355 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3356 *nft_set_ext_expiration(ext) =
3357 jiffies + msecs_to_jiffies(timeout);
3358 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3359 *nft_set_ext_timeout(ext) = timeout;
fe2811eb
PM		 3360
3361 return elem;
3362}
3363
61edafbb
PM		 3364void nft_set_elem_destroy(const struct nft_set *set, void *elem)
3365{
3366 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3367
3368 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3369 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3370 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
f25ad2e9
PM		 3371 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3372 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
61edafbb
PM		 3373
3374 kfree(elem);
3375}
3376EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3377
60319eb1 3378static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 3379 const struct nlattr *attr)
3380{
3381 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3382 struct nft_data_desc d1, d2;
fe2811eb
PM		 3383 struct nft_set_ext_tmpl tmpl;
3384 struct nft_set_ext *ext;
20a69341
PM		 3385 struct nft_set_elem elem;
3386 struct nft_set_binding *binding;
68e942e8 3387 struct nft_userdata *udata;
fe2811eb 3388 struct nft_data data;
20a69341 3389 enum nft_registers dreg;
60319eb1 3390 struct nft_trans *trans;
c3e1b005 3391 u64 timeout;
fe2811eb 3392 u32 flags;
68e942e8 3393 u8 ulen;
20a69341
PM		 3394 int err;
3395
3396 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3397 nft_set_elem_policy);
3398 if (err < 0)
3399 return err;
3400
3401 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3402 return -EINVAL;
3403
fe2811eb
PM		 3404 nft_set_ext_prepare(&tmpl);
3405
3406 flags = 0;
20a69341 3407 if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
fe2811eb
PM		 3408 flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
3409 if (flags & ~NFT_SET_ELEM_INTERVAL_END)
20a69341 3410 return -EINVAL;
55df35d2 3411 if (!(set->flags & NFT_SET_INTERVAL) &&
fe2811eb 3412 flags & NFT_SET_ELEM_INTERVAL_END)
55df35d2 3413 return -EINVAL;
fe2811eb
PM		 3414 if (flags != 0)
3415 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
20a69341
PM		 3416 }
3417
3418 if (set->flags & NFT_SET_MAP) {
3419 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
fe2811eb 3420 !(flags & NFT_SET_ELEM_INTERVAL_END))
20a69341 3421 return -EINVAL;
bd7fc645 3422 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
fe2811eb 3423 flags & NFT_SET_ELEM_INTERVAL_END)
bd7fc645 3424 return -EINVAL;
20a69341
PM		 3425 } else {
3426 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3427 return -EINVAL;
3428 }
3429
c3e1b005
PM		 3430 timeout = 0;
3431 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3432 if (!(set->flags & NFT_SET_TIMEOUT))
3433 return -EINVAL;
3434 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_ELEM_TIMEOUT]));
3435 } else if (set->flags & NFT_SET_TIMEOUT) {
3436 timeout = set->timeout;
3437 }
3438
7d740264 3439 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
d0a11fc3 3440 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 3441 if (err < 0)
3442 goto err1;
3443 err = -EINVAL;
3444 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3445 goto err2;
3446
7d740264 3447 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
c3e1b005
PM		 3448 if (timeout > 0) {
3449 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3450 if (timeout != set->timeout)
3451 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3452 }
fe2811eb 3453
20a69341 3454 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
d0a11fc3
PM		 3455 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3456 nla[NFTA_SET_ELEM_DATA]);
20a69341
PM		 3457 if (err < 0)
3458 goto err2;
3459
3460 err = -EINVAL;
3461 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3462 goto err3;
3463
3464 dreg = nft_type_to_reg(set->dtype);
3465 list_for_each_entry(binding, &set->bindings, list) {
3466 struct nft_ctx bind_ctx = {
3467 .afi = ctx->afi,
3468 .table = ctx->table,
7c95f6d8 3469 .chain = (struct nft_chain *)binding->chain,
20a69341
PM		 3470 };
3471
11113e19
PM		 3472 if (!(binding->flags & NFT_SET_MAP))
3473 continue;
3474
1ec10212
PM		 3475 err = nft_validate_register_store(&bind_ctx, dreg,
3476 &data,
3477 d2.type, d2.len);
20a69341
PM		 3478 if (err < 0)
3479 goto err3;
3480 }
fe2811eb 3481
7d740264 3482 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
20a69341
PM		 3483 }
3484
68e942e8
PM		 3485 /* The full maximum length of userdata can exceed the maximum
3486 * offset value (U8_MAX) for following extensions, therefor it
3487 * must be the last extension added.
3488 */
3489 ulen = 0;
3490 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3491 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3492 if (ulen > 0)
3493 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3494 ulen);
3495 }
3496
fe2811eb 3497 err = -ENOMEM;
7d740264 3498 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
c3e1b005 3499 timeout, GFP_KERNEL);
fe2811eb
PM		 3500 if (elem.priv == NULL)
3501 goto err3;
3502
3503 ext = nft_set_elem_ext(set, elem.priv);
3504 if (flags)
3505 *nft_set_ext_flags(ext) = flags;
68e942e8
PM		 3506 if (ulen > 0) {
3507 udata = nft_set_ext_userdata(ext);
3508 udata->len = ulen - 1;
3509 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3510 }
fe2811eb 3511
60319eb1
PNA		 3512 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3513 if (trans == NULL)
fe2811eb 3514 goto err4;
60319eb1 3515
69086658 3516 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
20a69341
PM		 3517 err = set->ops->insert(set, &elem);
3518 if (err < 0)
fe2811eb 3519 goto err5;
20a69341 3520
60319eb1 3521 nft_trans_elem(trans) = elem;
46bbafce 3522 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
20a69341
PM		 3523 return 0;
3524
fe2811eb 3525err5:
60319eb1 3526 kfree(trans);
fe2811eb
PM		 3527err4:
3528 kfree(elem.priv);
20a69341
PM		 3529err3:
3530 if (nla[NFTA_SET_ELEM_DATA] != NULL)
fe2811eb 3531 nft_data_uninit(&data, d2.type);
20a69341 3532err2:
7d740264 3533 nft_data_uninit(&elem.key.val, d1.type);
20a69341
PM		 3534err1:
3535 return err;
3536}
3537
633c9a84
PNA		 3538static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3539 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3540 const struct nlattr * const nla[])
3541{
3542 const struct nlattr *attr;
3543 struct nft_set *set;
3544 struct nft_ctx ctx;
60319eb1 3545 int rem, err = 0;
20a69341 3546
7d5570ca
PNA		 3547 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3548 return -EINVAL;
3549
f4c756b4 3550 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla);
20a69341
PM		 3551 if (err < 0)
3552 return err;
3553
3554 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
958bee14
PNA		 3555 if (IS_ERR(set)) {
3556 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3557 set = nf_tables_set_lookup_byid(net,
3558 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3559 }
3560 if (IS_ERR(set))
3561 return PTR_ERR(set);
3562 }
3563
20a69341
PM		 3564 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3565 return -EBUSY;
3566
3567 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3dd0673a
PM		 3568 if (set->size &&
3569 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact))
3570 return -ENFILE;
3571
20a69341 3572 err = nft_add_set_elem(&ctx, set, attr);
3dd0673a
PM		 3573 if (err < 0) {
3574 atomic_dec(&set->nelems);
60319eb1 3575 break;
3dd0673a 3576 }
20a69341 3577 }
60319eb1 3578 return err;
20a69341
PM		 3579}
3580
60319eb1 3581static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 3582 const struct nlattr *attr)
3583{
3584 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3585 struct nft_data_desc desc;
3586 struct nft_set_elem elem;
60319eb1 3587 struct nft_trans *trans;
20a69341
PM		 3588 int err;
3589
3590 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3591 nft_set_elem_policy);
3592 if (err < 0)
3593 goto err1;
3594
3595 err = -EINVAL;
3596 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3597 goto err1;
3598
7d740264 3599 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
d0a11fc3 3600 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 3601 if (err < 0)
3602 goto err1;
3603
3604 err = -EINVAL;
3605 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3606 goto err2;
3607
60319eb1 3608 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
609ccf08
JL		 3609 if (trans == NULL) {
3610 err = -ENOMEM;
60319eb1 3611 goto err2;
609ccf08 3612 }
20a69341 3613
cc02e457
PM		 3614 elem.priv = set->ops->deactivate(set, &elem);
3615 if (elem.priv == NULL) {
3616 err = -ENOENT;
3617 goto err3;
3618 }
3619
60319eb1 3620 nft_trans_elem(trans) = elem;
46bbafce 3621 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
0dc13625 3622 return 0;
cc02e457
PM		 3623
3624err3:
3625 kfree(trans);
20a69341 3626err2:
7d740264 3627 nft_data_uninit(&elem.key.val, desc.type);
20a69341
PM		 3628err1:
3629 return err;
3630}
3631
633c9a84
PNA		 3632static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3633 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3634 const struct nlattr * const nla[])
3635{
3636 const struct nlattr *attr;
3637 struct nft_set *set;
3638 struct nft_ctx ctx;
60319eb1 3639 int rem, err = 0;
20a69341 3640
7d5570ca
PNA		 3641 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3642 return -EINVAL;
3643
f4c756b4 3644 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla);
20a69341
PM		 3645 if (err < 0)
3646 return err;
3647
3648 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3649 if (IS_ERR(set))
3650 return PTR_ERR(set);
3651 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3652 return -EBUSY;
3653
3654 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3655 err = nft_del_setelem(&ctx, set, attr);
3656 if (err < 0)
60319eb1 3657 break;
4fefee57 3658
3dd0673a 3659 set->ndeact++;
20a69341 3660 }
60319eb1 3661 return err;
20a69341
PM		 3662}
3663
cfed7e1b
PM		 3664void nft_set_gc_batch_release(struct rcu_head *rcu)
3665{
3666 struct nft_set_gc_batch *gcb;
3667 unsigned int i;
3668
3669 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
3670 for (i = 0; i < gcb->head.cnt; i++)
3671 nft_set_elem_destroy(gcb->head.set, gcb->elems[i]);
3672 kfree(gcb);
3673}
3674EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
3675
3676struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
3677 gfp_t gfp)
3678{
3679 struct nft_set_gc_batch *gcb;
3680
3681 gcb = kzalloc(sizeof(*gcb), gfp);
3682 if (gcb == NULL)
3683 return gcb;
3684 gcb->head.set = set;
3685 return gcb;
3686}
3687EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
3688
84d7fce6
PNA		 3689static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
3690 u32 portid, u32 seq)
3691{
3692 struct nlmsghdr *nlh;
3693 struct nfgenmsg *nfmsg;
3694 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
3695
3696 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
3697 if (nlh == NULL)
3698 goto nla_put_failure;
3699
3700 nfmsg = nlmsg_data(nlh);
3701 nfmsg->nfgen_family = AF_UNSPEC;
3702 nfmsg->version = NFNETLINK_V0;
3703 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3704
3705 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
3706 goto nla_put_failure;
3707
053c095a
JB		 3708 nlmsg_end(skb, nlh);
3709 return 0;
84d7fce6
PNA		 3710
3711nla_put_failure:
3712 nlmsg_trim(skb, nlh);
3713 return -EMSGSIZE;
3714}
3715
3716static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
3717{
3718 struct nlmsghdr *nlh = nlmsg_hdr(skb);
3719 struct sk_buff *skb2;
3720 int err;
3721
3722 if (nlmsg_report(nlh) &&
3723 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3724 return 0;
3725
3726 err = -ENOBUFS;
3727 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3728 if (skb2 == NULL)
3729 goto err;
3730
3731 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3732 nlh->nlmsg_seq);
3733 if (err < 0) {
3734 kfree_skb(skb2);
3735 goto err;
3736 }
3737
3738 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
3739 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
3740err:
3741 if (err < 0) {
3742 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
3743 err);
3744 }
3745 return err;
3746}
3747
7b8002a1
PNA		 3748static int nf_tables_getgen(struct net *net, struct sock *nlsk,
3749 struct sk_buff *skb, const struct nlmsghdr *nlh,
84d7fce6
PNA		 3750 const struct nlattr * const nla[])
3751{
84d7fce6
PNA		 3752 struct sk_buff *skb2;
3753 int err;
3754
3755 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3756 if (skb2 == NULL)
3757 return -ENOMEM;
3758
3759 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3760 nlh->nlmsg_seq);
3761 if (err < 0)
3762 goto err;
3763
3764 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3765err:
3766 kfree_skb(skb2);
3767 return err;
3768}
3769
96518518
PM		 3770static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3771 [NFT_MSG_NEWTABLE] = {
55dd6f93 3772 .call_batch = nf_tables_newtable,
96518518
PM		 3773 .attr_count = NFTA_TABLE_MAX,
3774 .policy = nft_table_policy,
3775 },
3776 [NFT_MSG_GETTABLE] = {
3777 .call = nf_tables_gettable,
3778 .attr_count = NFTA_TABLE_MAX,
3779 .policy = nft_table_policy,
3780 },
3781 [NFT_MSG_DELTABLE] = {
55dd6f93 3782 .call_batch = nf_tables_deltable,
96518518
PM		 3783 .attr_count = NFTA_TABLE_MAX,
3784 .policy = nft_table_policy,
3785 },
3786 [NFT_MSG_NEWCHAIN] = {
91c7b38d 3787 .call_batch = nf_tables_newchain,
96518518
PM		 3788 .attr_count = NFTA_CHAIN_MAX,
3789 .policy = nft_chain_policy,
3790 },
3791 [NFT_MSG_GETCHAIN] = {
3792 .call = nf_tables_getchain,
3793 .attr_count = NFTA_CHAIN_MAX,
3794 .policy = nft_chain_policy,
3795 },
3796 [NFT_MSG_DELCHAIN] = {
91c7b38d 3797 .call_batch = nf_tables_delchain,
96518518
PM		 3798 .attr_count = NFTA_CHAIN_MAX,
3799 .policy = nft_chain_policy,
3800 },
3801 [NFT_MSG_NEWRULE] = {
0628b123 3802 .call_batch = nf_tables_newrule,
96518518
PM		 3803 .attr_count = NFTA_RULE_MAX,
3804 .policy = nft_rule_policy,
3805 },
3806 [NFT_MSG_GETRULE] = {
3807 .call = nf_tables_getrule,
3808 .attr_count = NFTA_RULE_MAX,
3809 .policy = nft_rule_policy,
3810 },
3811 [NFT_MSG_DELRULE] = {
0628b123 3812 .call_batch = nf_tables_delrule,
96518518
PM		 3813 .attr_count = NFTA_RULE_MAX,
3814 .policy = nft_rule_policy,
3815 },
20a69341 3816 [NFT_MSG_NEWSET] = {
958bee14 3817 .call_batch = nf_tables_newset,
20a69341
PM		 3818 .attr_count = NFTA_SET_MAX,
3819 .policy = nft_set_policy,
3820 },
3821 [NFT_MSG_GETSET] = {
3822 .call = nf_tables_getset,
3823 .attr_count = NFTA_SET_MAX,
3824 .policy = nft_set_policy,
3825 },
3826 [NFT_MSG_DELSET] = {
958bee14 3827 .call_batch = nf_tables_delset,
20a69341
PM		 3828 .attr_count = NFTA_SET_MAX,
3829 .policy = nft_set_policy,
3830 },
3831 [NFT_MSG_NEWSETELEM] = {
958bee14 3832 .call_batch = nf_tables_newsetelem,
20a69341
PM		 3833 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3834 .policy = nft_set_elem_list_policy,
3835 },
3836 [NFT_MSG_GETSETELEM] = {
3837 .call = nf_tables_getsetelem,
3838 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3839 .policy = nft_set_elem_list_policy,
3840 },
3841 [NFT_MSG_DELSETELEM] = {
958bee14 3842 .call_batch = nf_tables_delsetelem,
20a69341
PM		 3843 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3844 .policy = nft_set_elem_list_policy,
3845 },
84d7fce6
PNA		 3846 [NFT_MSG_GETGEN] = {
3847 .call = nf_tables_getgen,
3848 },
96518518
PM		 3849};
3850
91c7b38d
PNA		 3851static void nft_chain_commit_update(struct nft_trans *trans)
3852{
3853 struct nft_base_chain *basechain;
3854
3855 if (nft_trans_chain_name(trans)[0])
3856 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3857
3858 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3859 return;
3860
3861 basechain = nft_base_chain(trans->ctx.chain);
3862 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3863
3864 switch (nft_trans_chain_policy(trans)) {
3865 case NF_DROP:
3866 case NF_ACCEPT:
3867 basechain->policy = nft_trans_chain_policy(trans);
3868 break;
3869 }
3870}
3871
b326dd37 3872static void nf_tables_commit_release(struct nft_trans *trans)
c7c32e72 3873{
c7c32e72
PNA		 3874 switch (trans->msg_type) {
3875 case NFT_MSG_DELTABLE:
3876 nf_tables_table_destroy(&trans->ctx);
3877 break;
3878 case NFT_MSG_DELCHAIN:
3879 nf_tables_chain_destroy(trans->ctx.chain);
3880 break;
3881 case NFT_MSG_DELRULE:
3882 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3883 break;
3884 case NFT_MSG_DELSET:
3885 nft_set_destroy(nft_trans_set(trans));
3886 break;
61edafbb
PM		 3887 case NFT_MSG_DELSETELEM:
3888 nft_set_elem_destroy(nft_trans_elem_set(trans),
3889 nft_trans_elem(trans).priv);
3890 break;
c7c32e72
PNA		 3891 }
3892 kfree(trans);
3893}
3894
5913beaf 3895static int nf_tables_commit(struct net *net, struct sk_buff *skb)
37082f93 3896{
37082f93 3897 struct nft_trans *trans, *next;
a3716e70 3898 struct nft_trans_elem *te;
37082f93
PNA		 3899
3900 /* Bump generation counter, invalidate any dump in progress */
38e029f1 3901 while (++net->nft.base_seq == 0);
37082f93
PNA		 3902
3903 /* A new generation has just started */
ea4bd995 3904 net->nft.gencursor = nft_gencursor_next(net);
37082f93
PNA		 3905
3906 /* Make sure all packets have left the previous generation before
3907 * purging old rules.
3908 */
3909 synchronize_rcu();
3910
3911 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
b380e5c7 3912 switch (trans->msg_type) {
55dd6f93
PNA		 3913 case NFT_MSG_NEWTABLE:
3914 if (nft_trans_table_update(trans)) {
3915 if (!nft_trans_table_enable(trans)) {
3916 nf_tables_table_disable(trans->ctx.afi,
3917 trans->ctx.table);
3918 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3919 }
3920 } else {
3921 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3922 }
35151d84 3923 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
55dd6f93
PNA		 3924 nft_trans_destroy(trans);
3925 break;
3926 case NFT_MSG_DELTABLE:
35151d84 3927 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
55dd6f93 3928 break;
91c7b38d
PNA		 3929 case NFT_MSG_NEWCHAIN:
3930 if (nft_trans_chain_update(trans))
3931 nft_chain_commit_update(trans);
4fefee57 3932 else
91c7b38d 3933 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
4fefee57 3934
35151d84 3935 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
91c7b38d
PNA		 3936 nft_trans_destroy(trans);
3937 break;
3938 case NFT_MSG_DELCHAIN:
35151d84 3939 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
c5598794
AB		 3940 nf_tables_unregister_hooks(trans->ctx.table,
3941 trans->ctx.chain,
3942 trans->ctx.afi->nops);
91c7b38d 3943 break;
b380e5c7
PNA		 3944 case NFT_MSG_NEWRULE:
3945 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
35151d84 3946 nf_tables_rule_notify(&trans->ctx,
37082f93 3947 nft_trans_rule(trans),
35151d84 3948 NFT_MSG_NEWRULE);
37082f93 3949 nft_trans_destroy(trans);
b380e5c7
PNA		 3950 break;
3951 case NFT_MSG_DELRULE:
3952 list_del_rcu(&nft_trans_rule(trans)->list);
35151d84
PNA		 3953 nf_tables_rule_notify(&trans->ctx,
3954 nft_trans_rule(trans),
3955 NFT_MSG_DELRULE);
b380e5c7 3956 break;
958bee14
PNA		 3957 case NFT_MSG_NEWSET:
3958 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
4fefee57
PNA		 3959 /* This avoids hitting -EBUSY when deleting the table
3960 * from the transaction.
3961 */
3962 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
3963 !list_empty(&nft_trans_set(trans)->bindings))
3964 trans->ctx.table->use--;
3965
958bee14 3966 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 3967 NFT_MSG_NEWSET, GFP_KERNEL);
958bee14
PNA		 3968 nft_trans_destroy(trans);
3969 break;
3970 case NFT_MSG_DELSET:
3971 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 3972 NFT_MSG_DELSET, GFP_KERNEL);
958bee14 3973 break;
60319eb1 3974 case NFT_MSG_NEWSETELEM:
cc02e457
PM		 3975 te = (struct nft_trans_elem *)trans->data;
3976
3977 te->set->ops->activate(te->set, &te->elem);
3978 nf_tables_setelem_notify(&trans->ctx, te->set,
3979 &te->elem,
60319eb1
PNA		 3980 NFT_MSG_NEWSETELEM, 0);
3981 nft_trans_destroy(trans);
3982 break;
3983 case NFT_MSG_DELSETELEM:
a3716e70 3984 te = (struct nft_trans_elem *)trans->data;
fe2811eb 3985
a3716e70
PNA		 3986 nf_tables_setelem_notify(&trans->ctx, te->set,
3987 &te->elem,
60319eb1 3988 NFT_MSG_DELSETELEM, 0);
02263db0 3989 te->set->ops->remove(te->set, &te->elem);
3dd0673a
PM		 3990 atomic_dec(&te->set->nelems);
3991 te->set->ndeact--;
60319eb1 3992 break;
37082f93 3993 }
37082f93
PNA		 3994 }
3995
b326dd37
PNA		 3996 synchronize_rcu();
3997
37082f93 3998 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
c7c32e72 3999 list_del(&trans->list);
b326dd37 4000 nf_tables_commit_release(trans);
37082f93 4001 }
84d7fce6
PNA		 4002
4003 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
37082f93
PNA		 4004
4005 return 0;
4006}
4007
b326dd37 4008static void nf_tables_abort_release(struct nft_trans *trans)
c7c32e72 4009{
c7c32e72
PNA		 4010 switch (trans->msg_type) {
4011 case NFT_MSG_NEWTABLE:
4012 nf_tables_table_destroy(&trans->ctx);
4013 break;
4014 case NFT_MSG_NEWCHAIN:
4015 nf_tables_chain_destroy(trans->ctx.chain);
4016 break;
4017 case NFT_MSG_NEWRULE:
4018 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4019 break;
4020 case NFT_MSG_NEWSET:
4021 nft_set_destroy(nft_trans_set(trans));
4022 break;
61edafbb
PM		 4023 case NFT_MSG_NEWSETELEM:
4024 nft_set_elem_destroy(nft_trans_elem_set(trans),
4025 nft_trans_elem(trans).priv);
4026 break;
c7c32e72
PNA		 4027 }
4028 kfree(trans);
4029}
4030
5913beaf 4031static int nf_tables_abort(struct net *net, struct sk_buff *skb)
37082f93 4032{
37082f93 4033 struct nft_trans *trans, *next;
02263db0 4034 struct nft_trans_elem *te;
37082f93 4035
a907e36d
XL		 4036 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4037 list) {
b380e5c7 4038 switch (trans->msg_type) {
55dd6f93
PNA		 4039 case NFT_MSG_NEWTABLE:
4040 if (nft_trans_table_update(trans)) {
4041 if (nft_trans_table_enable(trans)) {
4042 nf_tables_table_disable(trans->ctx.afi,
4043 trans->ctx.table);
4044 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4045 }
4046 nft_trans_destroy(trans);
4047 } else {
e688a7f8 4048 list_del_rcu(&trans->ctx.table->list);
55dd6f93
PNA		 4049 }
4050 break;
4051 case NFT_MSG_DELTABLE:
e688a7f8
PNA		 4052 list_add_tail_rcu(&trans->ctx.table->list,
4053 &trans->ctx.afi->tables);
55dd6f93
PNA		 4054 nft_trans_destroy(trans);
4055 break;
91c7b38d
PNA		 4056 case NFT_MSG_NEWCHAIN:
4057 if (nft_trans_chain_update(trans)) {
982f4051 4058 free_percpu(nft_trans_chain_stats(trans));
91c7b38d
PNA		 4059
4060 nft_trans_destroy(trans);
4061 } else {
4fefee57 4062 trans->ctx.table->use--;
e688a7f8 4063 list_del_rcu(&trans->ctx.chain->list);
c5598794
AB		 4064 nf_tables_unregister_hooks(trans->ctx.table,
4065 trans->ctx.chain,
4066 trans->ctx.afi->nops);
91c7b38d
PNA		 4067 }
4068 break;
4069 case NFT_MSG_DELCHAIN:
4fefee57 4070 trans->ctx.table->use++;
e688a7f8
PNA		 4071 list_add_tail_rcu(&trans->ctx.chain->list,
4072 &trans->ctx.table->chains);
91c7b38d
PNA		 4073 nft_trans_destroy(trans);
4074 break;
b380e5c7 4075 case NFT_MSG_NEWRULE:
4fefee57 4076 trans->ctx.chain->use--;
b380e5c7
PNA		 4077 list_del_rcu(&nft_trans_rule(trans)->list);
4078 break;
4079 case NFT_MSG_DELRULE:
4fefee57 4080 trans->ctx.chain->use++;
b380e5c7 4081 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
37082f93 4082 nft_trans_destroy(trans);
b380e5c7 4083 break;
958bee14 4084 case NFT_MSG_NEWSET:
4fefee57 4085 trans->ctx.table->use--;
e688a7f8 4086 list_del_rcu(&nft_trans_set(trans)->list);
958bee14
PNA		 4087 break;
4088 case NFT_MSG_DELSET:
4fefee57 4089 trans->ctx.table->use++;
e688a7f8
PNA		 4090 list_add_tail_rcu(&nft_trans_set(trans)->list,
4091 &trans->ctx.table->sets);
958bee14
PNA		 4092 nft_trans_destroy(trans);
4093 break;
60319eb1 4094 case NFT_MSG_NEWSETELEM:
02263db0 4095 te = (struct nft_trans_elem *)trans->data;
fe2811eb 4096
02263db0 4097 te->set->ops->remove(te->set, &te->elem);
3dd0673a 4098 atomic_dec(&te->set->nelems);
60319eb1
PNA		 4099 break;
4100 case NFT_MSG_DELSETELEM:
cc02e457
PM		 4101 te = (struct nft_trans_elem *)trans->data;
4102
cc02e457 4103 te->set->ops->activate(te->set, &te->elem);
3dd0673a 4104 te->set->ndeact--;
cc02e457 4105
60319eb1
PNA		 4106 nft_trans_destroy(trans);
4107 break;
37082f93 4108 }
37082f93
PNA		 4109 }
4110
b326dd37
PNA		 4111 synchronize_rcu();
4112
a1cee076
PNA		 4113 list_for_each_entry_safe_reverse(trans, next,
4114 &net->nft.commit_list, list) {
c7c32e72 4115 list_del(&trans->list);
b326dd37 4116 nf_tables_abort_release(trans);
37082f93
PNA		 4117 }
4118
4119 return 0;
4120}
4121
96518518
PM		 4122static const struct nfnetlink_subsystem nf_tables_subsys = {
4123 .name = "nf_tables",
4124 .subsys_id = NFNL_SUBSYS_NFTABLES,
4125 .cb_count = NFT_MSG_MAX,
4126 .cb = nf_tables_cb,
0628b123
PNA		 4127 .commit = nf_tables_commit,
4128 .abort = nf_tables_abort,
96518518
PM		 4129};
4130
7210e4e3
PNA		 4131int nft_chain_validate_dependency(const struct nft_chain *chain,
4132 enum nft_chain_type type)
4133{
4134 const struct nft_base_chain *basechain;
4135
4136 if (chain->flags & NFT_BASE_CHAIN) {
4137 basechain = nft_base_chain(chain);
4138 if (basechain->type->type != type)
4139 return -EOPNOTSUPP;
4140 }
4141 return 0;
4142}
4143EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
4144
75e8d06d
PNA		 4145int nft_chain_validate_hooks(const struct nft_chain *chain,
4146 unsigned int hook_flags)
4147{
4148 struct nft_base_chain *basechain;
4149
4150 if (chain->flags & NFT_BASE_CHAIN) {
4151 basechain = nft_base_chain(chain);
4152
4153 if ((1 << basechain->ops[0].hooknum) & hook_flags)
4154 return 0;
4155
4156 return -EOPNOTSUPP;
4157 }
4158
4159 return 0;
4160}
4161EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
4162
20a69341
PM		 4163/*
4164 * Loop detection - walk through the ruleset beginning at the destination chain
4165 * of a new jump until either the source chain is reached (loop) or all
4166 * reachable chains have been traversed.
4167 *
4168 * The loop check is performed whenever a new jump verdict is added to an
4169 * expression or verdict map or a verdict map is bound to a new chain.
4170 */
4171
4172static int nf_tables_check_loops(const struct nft_ctx *ctx,
4173 const struct nft_chain *chain);
4174
4175static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
4176 const struct nft_set *set,
4177 const struct nft_set_iter *iter,
4178 const struct nft_set_elem *elem)
4179{
fe2811eb
PM		 4180 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4181 const struct nft_data *data;
4182
4183 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4184 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
62f9c8b4
PNA		 4185 return 0;
4186
fe2811eb 4187 data = nft_set_ext_data(ext);
1ca2e170 4188 switch (data->verdict.code) {
20a69341
PM		 4189 case NFT_JUMP:
4190 case NFT_GOTO:
1ca2e170 4191 return nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 4192 default:
4193 return 0;
4194 }
4195}
4196
4197static int nf_tables_check_loops(const struct nft_ctx *ctx,
4198 const struct nft_chain *chain)
4199{
4200 const struct nft_rule *rule;
4201 const struct nft_expr *expr, *last;
20a69341
PM		 4202 const struct nft_set *set;
4203 struct nft_set_binding *binding;
4204 struct nft_set_iter iter;
20a69341
PM		 4205
4206 if (ctx->chain == chain)
4207 return -ELOOP;
4208
4209 list_for_each_entry(rule, &chain->rules, list) {
4210 nft_rule_for_each_expr(expr, last, rule) {
0ca743a5
PNA		 4211 const struct nft_data *data = NULL;
4212 int err;
4213
4214 if (!expr->ops->validate)
20a69341
PM		 4215 continue;
4216
0ca743a5
PNA		 4217 err = expr->ops->validate(ctx, expr, &data);
4218 if (err < 0)
4219 return err;
4220
20a69341 4221 if (data == NULL)
0ca743a5 4222 continue;
20a69341 4223
1ca2e170 4224 switch (data->verdict.code) {
20a69341
PM		 4225 case NFT_JUMP:
4226 case NFT_GOTO:
1ca2e170
PM		 4227 err = nf_tables_check_loops(ctx,
4228 data->verdict.chain);
20a69341
PM		 4229 if (err < 0)
4230 return err;
4231 default:
4232 break;
4233 }
4234 }
4235 }
4236
4237 list_for_each_entry(set, &ctx->table->sets, list) {
4238 if (!(set->flags & NFT_SET_MAP) ||
4239 set->dtype != NFT_DATA_VERDICT)
4240 continue;
4241
4242 list_for_each_entry(binding, &set->bindings, list) {
11113e19
PM		 4243 if (!(binding->flags & NFT_SET_MAP) ||
4244 binding->chain != chain)
20a69341
PM		 4245 continue;
4246
4247 iter.skip = 0;
4248 iter.count = 0;
4249 iter.err = 0;
4250 iter.fn = nf_tables_loop_check_setelem;
4251
4252 set->ops->walk(ctx, set, &iter);
4253 if (iter.err < 0)
4254 return iter.err;
4255 }
4256 }
4257
4258 return 0;
4259}
4260
49499c3e
PM		 4261/**
4262 * nft_parse_register - parse a register value from a netlink attribute
4263 *
4264 * @attr: netlink attribute
4265 *
4266 * Parse and translate a register value from a netlink attribute.
4267 * Registers used to be 128 bit wide, these register numbers will be
4268 * mapped to the corresponding 32 bit register numbers.
4269 */
b1c96ed3
PM		 4270unsigned int nft_parse_register(const struct nlattr *attr)
4271{
49499c3e
PM		 4272 unsigned int reg;
4273
4274 reg = ntohl(nla_get_be32(attr));
4275 switch (reg) {
4276 case NFT_REG_VERDICT...NFT_REG_4:
4277 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
4278 default:
4279 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
4280 }
b1c96ed3
PM		 4281}
4282EXPORT_SYMBOL_GPL(nft_parse_register);
4283
49499c3e
PM		 4284/**
4285 * nft_dump_register - dump a register value to a netlink attribute
4286 *
4287 * @skb: socket buffer
4288 * @attr: attribute number
4289 * @reg: register number
4290 *
4291 * Construct a netlink attribute containing the register number. For
4292 * compatibility reasons, register numbers being a multiple of 4 are
4293 * translated to the corresponding 128 bit register numbers.
4294 */
b1c96ed3
PM		 4295int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
4296{
49499c3e
PM		 4297 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
4298 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
4299 else
4300 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
4301
b1c96ed3
PM		 4302 return nla_put_be32(skb, attr, htonl(reg));
4303}
4304EXPORT_SYMBOL_GPL(nft_dump_register);
4305
96518518 4306/**
d07db988 4307 * nft_validate_register_load - validate a load from a register
96518518
PM		 4308 *
4309 * @reg: the register number
d07db988 4310 * @len: the length of the data
96518518
PM		 4311 *
4312 * Validate that the input register is one of the general purpose
d07db988 4313 * registers and that the length of the load is within the bounds.
96518518 4314 */
d07db988 4315int nft_validate_register_load(enum nft_registers reg, unsigned int len)
96518518 4316{
49499c3e 4317 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
96518518 4318 return -EINVAL;
d07db988
PM		 4319 if (len == 0)
4320 return -EINVAL;
49499c3e 4321 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
d07db988 4322 return -ERANGE;
49499c3e 4323
96518518
PM		 4324 return 0;
4325}
d07db988 4326EXPORT_SYMBOL_GPL(nft_validate_register_load);
96518518 4327
96518518 4328/**
1ec10212 4329 * nft_validate_register_store - validate an expressions' register store
96518518
PM		 4330 *
4331 * @ctx: context of the expression performing the load
4332 * @reg: the destination register number
4333 * @data: the data to load
4334 * @type: the data type
45d9bcda 4335 * @len: the length of the data
96518518
PM		 4336 *
4337 * Validate that a data load uses the appropriate data type for
45d9bcda
PM		 4338 * the destination register and the length is within the bounds.
4339 * A value of NULL for the data means that its runtime gathered
58f40ab6 4340 * data.
96518518 4341 */
1ec10212
PM		 4342int nft_validate_register_store(const struct nft_ctx *ctx,
4343 enum nft_registers reg,
4344 const struct nft_data *data,
4345 enum nft_data_types type, unsigned int len)
96518518 4346{
20a69341
PM		 4347 int err;
4348
96518518
PM		 4349 switch (reg) {
4350 case NFT_REG_VERDICT:
58f40ab6 4351 if (type != NFT_DATA_VERDICT)
96518518 4352 return -EINVAL;
20a69341 4353
58f40ab6 4354 if (data != NULL &&
1ca2e170
PM		 4355 (data->verdict.code == NFT_GOTO ||
4356 data->verdict.code == NFT_JUMP)) {
4357 err = nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 4358 if (err < 0)
4359 return err;
4360
1ca2e170
PM		 4361 if (ctx->chain->level + 1 >
4362 data->verdict.chain->level) {
20a69341
PM		 4363 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
4364 return -EMLINK;
1ca2e170 4365 data->verdict.chain->level = ctx->chain->level + 1;
20a69341
PM		 4366 }
4367 }
4368
96518518
PM		 4369 return 0;
4370 default:
49499c3e 4371 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
27e6d201 4372 return -EINVAL;
45d9bcda
PM		 4373 if (len == 0)
4374 return -EINVAL;
49499c3e
PM		 4375 if (reg * NFT_REG32_SIZE + len >
4376 FIELD_SIZEOF(struct nft_regs, data))
45d9bcda 4377 return -ERANGE;
27e6d201 4378
96518518
PM		 4379 if (data != NULL && type != NFT_DATA_VALUE)
4380 return -EINVAL;
4381 return 0;
4382 }
4383}
1ec10212 4384EXPORT_SYMBOL_GPL(nft_validate_register_store);
96518518
PM		 4385
4386static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
4387 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
4388 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
4389 .len = NFT_CHAIN_MAXNAMELEN - 1 },
4390};
4391
4392static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
4393 struct nft_data_desc *desc, const struct nlattr *nla)
4394{
4395 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
4396 struct nft_chain *chain;
4397 int err;
4398
4399 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
4400 if (err < 0)
4401 return err;
4402
4403 if (!tb[NFTA_VERDICT_CODE])
4404 return -EINVAL;
1ca2e170 4405 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
96518518 4406
1ca2e170 4407 switch (data->verdict.code) {
e0abdadc 4408 default:
1ca2e170 4409 switch (data->verdict.code & NF_VERDICT_MASK) {
e0abdadc
PM		 4410 case NF_ACCEPT:
4411 case NF_DROP:
4412 case NF_QUEUE:
4413 break;
4414 default:
4415 return -EINVAL;
4416 }
4417 /* fall through */
96518518
PM		 4418 case NFT_CONTINUE:
4419 case NFT_BREAK:
4420 case NFT_RETURN:
96518518
PM		 4421 break;
4422 case NFT_JUMP:
4423 case NFT_GOTO:
4424 if (!tb[NFTA_VERDICT_CHAIN])
4425 return -EINVAL;
4426 chain = nf_tables_chain_lookup(ctx->table,
4427 tb[NFTA_VERDICT_CHAIN]);
4428 if (IS_ERR(chain))
4429 return PTR_ERR(chain);
4430 if (chain->flags & NFT_BASE_CHAIN)
4431 return -EOPNOTSUPP;
4432
96518518 4433 chain->use++;
1ca2e170 4434 data->verdict.chain = chain;
96518518 4435 break;
96518518
PM		 4436 }
4437
4c4ed074 4438 desc->len = sizeof(data->verdict);
96518518
PM		 4439 desc->type = NFT_DATA_VERDICT;
4440 return 0;
4441}
4442
4443static void nft_verdict_uninit(const struct nft_data *data)
4444{
1ca2e170 4445 switch (data->verdict.code) {
96518518
PM		 4446 case NFT_JUMP:
4447 case NFT_GOTO:
1ca2e170 4448 data->verdict.chain->use--;
96518518
PM		 4449 break;
4450 }
4451}
4452
33d5a7b1 4453int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
96518518
PM		 4454{
4455 struct nlattr *nest;
4456
33d5a7b1 4457 nest = nla_nest_start(skb, type);
96518518
PM		 4458 if (!nest)
4459 goto nla_put_failure;
4460
33d5a7b1 4461 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
96518518
PM		 4462 goto nla_put_failure;
4463
33d5a7b1 4464 switch (v->code) {
96518518
PM		 4465 case NFT_JUMP:
4466 case NFT_GOTO:
1ca2e170 4467 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
33d5a7b1 4468 v->chain->name))
96518518
PM		 4469 goto nla_put_failure;
4470 }
4471 nla_nest_end(skb, nest);
4472 return 0;
4473
4474nla_put_failure:
4475 return -1;
4476}
4477
d0a11fc3
PM		 4478static int nft_value_init(const struct nft_ctx *ctx,
4479 struct nft_data *data, unsigned int size,
96518518
PM		 4480 struct nft_data_desc *desc, const struct nlattr *nla)
4481{
4482 unsigned int len;
4483
4484 len = nla_len(nla);
4485 if (len == 0)
4486 return -EINVAL;
d0a11fc3 4487 if (len > size)
96518518
PM		 4488 return -EOVERFLOW;
4489
d0a11fc3 4490 nla_memcpy(data->data, nla, len);
96518518
PM		 4491 desc->type = NFT_DATA_VALUE;
4492 desc->len = len;
4493 return 0;
4494}
4495
4496static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
4497 unsigned int len)
4498{
4499 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
4500}
4501
4502static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
d0a11fc3 4503 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
96518518
PM		 4504 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
4505};
4506
4507/**
4508 * nft_data_init - parse nf_tables data netlink attributes
4509 *
4510 * @ctx: context of the expression using the data
4511 * @data: destination struct nft_data
d0a11fc3 4512 * @size: maximum data length
96518518
PM		 4513 * @desc: data description
4514 * @nla: netlink attribute containing data
4515 *
4516 * Parse the netlink data attributes and initialize a struct nft_data.
4517 * The type and length of data are returned in the data description.
4518 *
4519 * The caller can indicate that it only wants to accept data of type
4520 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4521 */
d0a11fc3
PM		 4522int nft_data_init(const struct nft_ctx *ctx,
4523 struct nft_data *data, unsigned int size,
96518518
PM		 4524 struct nft_data_desc *desc, const struct nlattr *nla)
4525{
4526 struct nlattr *tb[NFTA_DATA_MAX + 1];
4527 int err;
4528
4529 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
4530 if (err < 0)
4531 return err;
4532
4533 if (tb[NFTA_DATA_VALUE])
d0a11fc3
PM		 4534 return nft_value_init(ctx, data, size, desc,
4535 tb[NFTA_DATA_VALUE]);
96518518
PM		 4536 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
4537 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
4538 return -EINVAL;
4539}
4540EXPORT_SYMBOL_GPL(nft_data_init);
4541
4542/**
4543 * nft_data_uninit - release a nft_data item
4544 *
4545 * @data: struct nft_data to release
4546 * @type: type of data
4547 *
4548 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4549 * all others need to be released by calling this function.
4550 */
4551void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
4552{
960bd2c2 4553 if (type < NFT_DATA_VERDICT)
96518518 4554 return;
960bd2c2 4555 switch (type) {
96518518
PM		 4556 case NFT_DATA_VERDICT:
4557 return nft_verdict_uninit(data);
4558 default:
4559 WARN_ON(1);
4560 }
4561}
4562EXPORT_SYMBOL_GPL(nft_data_uninit);
4563
4564int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4565 enum nft_data_types type, unsigned int len)
4566{
4567 struct nlattr *nest;
4568 int err;
4569
4570 nest = nla_nest_start(skb, attr);
4571 if (nest == NULL)
4572 return -1;
4573
4574 switch (type) {
4575 case NFT_DATA_VALUE:
4576 err = nft_value_dump(skb, data, len);
4577 break;
4578 case NFT_DATA_VERDICT:
33d5a7b1 4579 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
96518518
PM		 4580 break;
4581 default:
4582 err = -EINVAL;
4583 WARN_ON(1);
4584 }
4585
4586 nla_nest_end(skb, nest);
4587 return err;
4588}
4589EXPORT_SYMBOL_GPL(nft_data_dump);
4590
df05ef87 4591static int __net_init nf_tables_init_net(struct net *net)
99633ab2
PNA		 4592{
4593 INIT_LIST_HEAD(&net->nft.af_info);
0628b123 4594 INIT_LIST_HEAD(&net->nft.commit_list);
38e029f1 4595 net->nft.base_seq = 1;
99633ab2
PNA		 4596 return 0;
4597}
4598
5ebe0b0e
PNA		 4599int __nft_release_basechain(struct nft_ctx *ctx)
4600{
4601 struct nft_rule *rule, *nr;
4602
4603 BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
4604
4605 nf_tables_unregister_hooks(ctx->chain->table, ctx->chain,
4606 ctx->afi->nops);
4607 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
4608 list_del(&rule->list);
4609 ctx->chain->use--;
4610 nf_tables_rule_destroy(ctx, rule);
4611 }
4612 list_del(&ctx->chain->list);
4613 ctx->table->use--;
4614 nf_tables_chain_destroy(ctx->chain);
4615
4616 return 0;
4617}
4618EXPORT_SYMBOL_GPL(__nft_release_basechain);
4619
df05ef87
PNA		 4620/* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
4621static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
4622{
4623 struct nft_table *table, *nt;
4624 struct nft_chain *chain, *nc;
4625 struct nft_rule *rule, *nr;
4626 struct nft_set *set, *ns;
4627 struct nft_ctx ctx = {
4628 .net = net,
4629 .afi = afi,
4630 };
4631
4632 list_for_each_entry_safe(table, nt, &afi->tables, list) {
4633 list_for_each_entry(chain, &table->chains, list)
4634 nf_tables_unregister_hooks(table, chain, afi->nops);
4635 /* No packets are walking on these chains anymore. */
4636 ctx.table = table;
4637 list_for_each_entry(chain, &table->chains, list) {
4638 ctx.chain = chain;
4639 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
4640 list_del(&rule->list);
4641 chain->use--;
4642 nf_tables_rule_destroy(&ctx, rule);
4643 }
4644 }
4645 list_for_each_entry_safe(set, ns, &table->sets, list) {
4646 list_del(&set->list);
4647 table->use--;
4648 nft_set_destroy(set);
4649 }
4650 list_for_each_entry_safe(chain, nc, &table->chains, list) {
4651 list_del(&chain->list);
4652 table->use--;
4653 nf_tables_chain_destroy(chain);
4654 }
4655 list_del(&table->list);
4656 nf_tables_table_destroy(&ctx);
4657 }
4658}
4659
99633ab2
PNA		 4660static struct pernet_operations nf_tables_net_ops = {
4661 .init = nf_tables_init_net,
4662};
4663
96518518
PM		 4664static int __init nf_tables_module_init(void)
4665{
4666 int err;
4667
4668 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4669 GFP_KERNEL);
4670 if (info == NULL) {
4671 err = -ENOMEM;
4672 goto err1;
4673 }
4674
4675 err = nf_tables_core_module_init();
4676 if (err < 0)
4677 goto err2;
4678
4679 err = nfnetlink_subsys_register(&nf_tables_subsys);
4680 if (err < 0)
4681 goto err3;
4682
4683 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
99633ab2 4684 return register_pernet_subsys(&nf_tables_net_ops);
96518518
PM		 4685err3:
4686 nf_tables_core_module_exit();
4687err2:
4688 kfree(info);
4689err1:
4690 return err;
4691}
4692
4693static void __exit nf_tables_module_exit(void)
4694{
99633ab2 4695 unregister_pernet_subsys(&nf_tables_net_ops);
96518518 4696 nfnetlink_subsys_unregister(&nf_tables_subsys);
1b1bc49c 4697 rcu_barrier();
96518518
PM		 4698 nf_tables_core_module_exit();
4699 kfree(info);
4700}
4701
4702module_init(nf_tables_module_init);
4703module_exit(nf_tables_module_exit);
4704
4705MODULE_LICENSE("GPL");
4706MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4707MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
Linux 6.x block layer and io_uring tree(s)