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Merge remote-tracking branches 'asoc/topic/fsl-spdif', 'asoc/topic/hdmi', 'asoc/topic...
[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)
6cafaf47 1727 goto err3;
0b2d8a7b
PM		 1728
1729 return expr;
6cafaf47
LZ		 1730err3:
1731 kfree(expr);
0b2d8a7b
PM		 1732err2:
1733 module_put(info.ops->type->owner);
1734err1:
1735 return ERR_PTR(err);
1736}
1737
1738void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1739{
1740 nf_tables_expr_destroy(ctx, expr);
1741 kfree(expr);
1742}
1743
96518518
PM		 1744/*
1745 * Rules
1746 */
1747
1748static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1749 u64 handle)
1750{
1751 struct nft_rule *rule;
1752
1753 // FIXME: this sucks
1754 list_for_each_entry(rule, &chain->rules, list) {
1755 if (handle == rule->handle)
1756 return rule;
1757 }
1758
1759 return ERR_PTR(-ENOENT);
1760}
1761
1762static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1763 const struct nlattr *nla)
1764{
1765 if (nla == NULL)
1766 return ERR_PTR(-EINVAL);
1767
1768 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1769}
1770
1771static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1772 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1773 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1774 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1775 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1776 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
0ca743a5 1777 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
5e948466 1778 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
0768b3b3
PNA		 1779 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1780 .len = NFT_USERDATA_MAXLEN },
96518518
PM		 1781};
1782
84d7fce6
PNA		 1783static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1784 u32 portid, u32 seq, int event,
1785 u32 flags, int family,
96518518
PM		 1786 const struct nft_table *table,
1787 const struct nft_chain *chain,
1788 const struct nft_rule *rule)
1789{
1790 struct nlmsghdr *nlh;
1791 struct nfgenmsg *nfmsg;
1792 const struct nft_expr *expr, *next;
1793 struct nlattr *list;
5e948466
EL		 1794 const struct nft_rule *prule;
1795 int type = event | NFNL_SUBSYS_NFTABLES << 8;
96518518 1796
5e948466 1797 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
96518518
PM		 1798 flags);
1799 if (nlh == NULL)
1800 goto nla_put_failure;
1801
1802 nfmsg = nlmsg_data(nlh);
1803 nfmsg->nfgen_family = family;
1804 nfmsg->version = NFNETLINK_V0;
84d7fce6 1805 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 1806
1807 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1808 goto nla_put_failure;
1809 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1810 goto nla_put_failure;
b46f6ded
ND		 1811 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1812 NFTA_RULE_PAD))
96518518
PM		 1813 goto nla_put_failure;
1814
5e948466
EL		 1815 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1816 prule = list_entry(rule->list.prev, struct nft_rule, list);
1817 if (nla_put_be64(skb, NFTA_RULE_POSITION,
b46f6ded
ND		 1818 cpu_to_be64(prule->handle),
1819 NFTA_RULE_PAD))
5e948466
EL		 1820 goto nla_put_failure;
1821 }
1822
96518518
PM		 1823 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1824 if (list == NULL)
1825 goto nla_put_failure;
1826 nft_rule_for_each_expr(expr, next, rule) {
0b2d8a7b 1827 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
96518518 1828 goto nla_put_failure;
96518518
PM		 1829 }
1830 nla_nest_end(skb, list);
1831
86f1ec32
PM		 1832 if (rule->udata) {
1833 struct nft_userdata *udata = nft_userdata(rule);
1834 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1835 udata->data) < 0)
1836 goto nla_put_failure;
1837 }
0768b3b3 1838
053c095a
JB		 1839 nlmsg_end(skb, nlh);
1840 return 0;
96518518
PM		 1841
1842nla_put_failure:
1843 nlmsg_trim(skb, nlh);
1844 return -1;
1845}
1846
35151d84 1847static int nf_tables_rule_notify(const struct nft_ctx *ctx,
96518518 1848 const struct nft_rule *rule,
35151d84 1849 int event)
96518518
PM		 1850{
1851 struct sk_buff *skb;
96518518
PM		 1852 int err;
1853
128ad332
PNA		 1854 if (!ctx->report &&
1855 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
96518518
PM		 1856 return 0;
1857
1858 err = -ENOBUFS;
1859 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1860 if (skb == NULL)
1861 goto err;
1862
84d7fce6
PNA		 1863 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1864 event, 0, ctx->afi->family, ctx->table,
35151d84 1865 ctx->chain, rule);
96518518
PM		 1866 if (err < 0) {
1867 kfree_skb(skb);
1868 goto err;
1869 }
1870
128ad332
PNA		 1871 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1872 ctx->report, GFP_KERNEL);
96518518 1873err:
128ad332
PNA		 1874 if (err < 0) {
1875 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1876 err);
1877 }
96518518
PM		 1878 return err;
1879}
1880
1881static int nf_tables_dump_rules(struct sk_buff *skb,
1882 struct netlink_callback *cb)
1883{
1884 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1885 const struct nft_af_info *afi;
1886 const struct nft_table *table;
1887 const struct nft_chain *chain;
1888 const struct nft_rule *rule;
1889 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1890 struct net *net = sock_net(skb->sk);
96518518
PM		 1891 int family = nfmsg->nfgen_family;
1892
e688a7f8 1893 rcu_read_lock();
38e029f1
PNA		 1894 cb->seq = net->nft.base_seq;
1895
e688a7f8 1896 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 1897 if (family != NFPROTO_UNSPEC && family != afi->family)
1898 continue;
1899
e688a7f8
PNA		 1900 list_for_each_entry_rcu(table, &afi->tables, list) {
1901 list_for_each_entry_rcu(chain, &table->chains, list) {
1902 list_for_each_entry_rcu(rule, &chain->rules, list) {
0628b123
PNA		 1903 if (!nft_rule_is_active(net, rule))
1904 goto cont;
96518518
PM		 1905 if (idx < s_idx)
1906 goto cont;
1907 if (idx > s_idx)
1908 memset(&cb->args[1], 0,
1909 sizeof(cb->args) - sizeof(cb->args[0]));
84d7fce6 1910 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
96518518
PM		 1911 cb->nlh->nlmsg_seq,
1912 NFT_MSG_NEWRULE,
1913 NLM_F_MULTI | NLM_F_APPEND,
1914 afi->family, table, chain, rule) < 0)
1915 goto done;
38e029f1
PNA		 1916
1917 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 1918cont:
1919 idx++;
1920 }
1921 }
1922 }
1923 }
1924done:
e688a7f8
PNA		 1925 rcu_read_unlock();
1926
96518518
PM		 1927 cb->args[0] = idx;
1928 return skb->len;
1929}
1930
7b8002a1
PNA		 1931static int nf_tables_getrule(struct net *net, struct sock *nlsk,
1932 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 1933 const struct nlattr * const nla[])
1934{
1935 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1936 const struct nft_af_info *afi;
1937 const struct nft_table *table;
1938 const struct nft_chain *chain;
1939 const struct nft_rule *rule;
1940 struct sk_buff *skb2;
1941 int family = nfmsg->nfgen_family;
1942 int err;
1943
1944 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1945 struct netlink_dump_control c = {
1946 .dump = nf_tables_dump_rules,
1947 };
1948 return netlink_dump_start(nlsk, skb, nlh, &c);
1949 }
1950
99633ab2 1951 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1952 if (IS_ERR(afi))
1953 return PTR_ERR(afi);
1954
9370761c 1955 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
96518518
PM		 1956 if (IS_ERR(table))
1957 return PTR_ERR(table);
55dd6f93
PNA		 1958 if (table->flags & NFT_TABLE_INACTIVE)
1959 return -ENOENT;
96518518
PM		 1960
1961 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1962 if (IS_ERR(chain))
1963 return PTR_ERR(chain);
91c7b38d
PNA		 1964 if (chain->flags & NFT_CHAIN_INACTIVE)
1965 return -ENOENT;
96518518
PM		 1966
1967 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1968 if (IS_ERR(rule))
1969 return PTR_ERR(rule);
1970
1971 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1972 if (!skb2)
1973 return -ENOMEM;
1974
84d7fce6 1975 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 1976 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1977 family, table, chain, rule);
1978 if (err < 0)
1979 goto err;
1980
1981 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1982
1983err:
1984 kfree_skb(skb2);
1985 return err;
1986}
1987
62472bce
PM		 1988static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1989 struct nft_rule *rule)
96518518 1990{
96518518
PM		 1991 struct nft_expr *expr;
1992
1993 /*
1994 * Careful: some expressions might not be initialized in case this
1995 * is called on error from nf_tables_newrule().
1996 */
1997 expr = nft_expr_first(rule);
1998 while (expr->ops && expr != nft_expr_last(rule)) {
62472bce 1999 nf_tables_expr_destroy(ctx, expr);
96518518
PM		 2000 expr = nft_expr_next(expr);
2001 }
2002 kfree(rule);
2003}
2004
1081d11b
PNA		 2005#define NFT_RULE_MAXEXPRS 128
2006
2007static struct nft_expr_info *info;
2008
633c9a84
PNA		 2009static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2010 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 2011 const struct nlattr * const nla[])
2012{
2013 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8 2014 struct nft_af_info *afi;
96518518
PM		 2015 struct nft_table *table;
2016 struct nft_chain *chain;
2017 struct nft_rule *rule, *old_rule = NULL;
86f1ec32 2018 struct nft_userdata *udata;
1081d11b 2019 struct nft_trans *trans = NULL;
96518518
PM		 2020 struct nft_expr *expr;
2021 struct nft_ctx ctx;
2022 struct nlattr *tmp;
86f1ec32 2023 unsigned int size, i, n, ulen = 0, usize = 0;
96518518
PM		 2024 int err, rem;
2025 bool create;
5e948466 2026 u64 handle, pos_handle;
96518518
PM		 2027
2028 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2029
99633ab2 2030 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
96518518
PM		 2031 if (IS_ERR(afi))
2032 return PTR_ERR(afi);
2033
9370761c 2034 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
96518518
PM		 2035 if (IS_ERR(table))
2036 return PTR_ERR(table);
2037
2038 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2039 if (IS_ERR(chain))
2040 return PTR_ERR(chain);
2041
2042 if (nla[NFTA_RULE_HANDLE]) {
2043 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2044 rule = __nf_tables_rule_lookup(chain, handle);
2045 if (IS_ERR(rule))
2046 return PTR_ERR(rule);
2047
2048 if (nlh->nlmsg_flags & NLM_F_EXCL)
2049 return -EEXIST;
2050 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2051 old_rule = rule;
2052 else
2053 return -EOPNOTSUPP;
2054 } else {
2055 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2056 return -EINVAL;
2057 handle = nf_tables_alloc_handle(table);
a0a7379e
PNA		 2058
2059 if (chain->use == UINT_MAX)
2060 return -EOVERFLOW;
96518518
PM		 2061 }
2062
5e948466
EL		 2063 if (nla[NFTA_RULE_POSITION]) {
2064 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2065 return -EOPNOTSUPP;
2066
2067 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2068 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2069 if (IS_ERR(old_rule))
2070 return PTR_ERR(old_rule);
2071 }
2072
633c9a84 2073 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0ca743a5 2074
96518518
PM		 2075 n = 0;
2076 size = 0;
2077 if (nla[NFTA_RULE_EXPRESSIONS]) {
2078 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2079 err = -EINVAL;
2080 if (nla_type(tmp) != NFTA_LIST_ELEM)
2081 goto err1;
2082 if (n == NFT_RULE_MAXEXPRS)
2083 goto err1;
0ca743a5 2084 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
96518518
PM		 2085 if (err < 0)
2086 goto err1;
2087 size += info[n].ops->size;
2088 n++;
2089 }
2090 }
9889840f
PM		 2091 /* Check for overflow of dlen field */
2092 err = -EFBIG;
2093 if (size >= 1 << 12)
2094 goto err1;
96518518 2095
86f1ec32 2096 if (nla[NFTA_RULE_USERDATA]) {
0768b3b3 2097 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
86f1ec32
PM		 2098 if (ulen > 0)
2099 usize = sizeof(struct nft_userdata) + ulen;
2100 }
0768b3b3 2101
96518518 2102 err = -ENOMEM;
86f1ec32 2103 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
96518518
PM		 2104 if (rule == NULL)
2105 goto err1;
2106
0628b123
PNA		 2107 nft_rule_activate_next(net, rule);
2108
96518518
PM		 2109 rule->handle = handle;
2110 rule->dlen = size;
86f1ec32 2111 rule->udata = ulen ? 1 : 0;
0768b3b3 2112
86f1ec32
PM		 2113 if (ulen) {
2114 udata = nft_userdata(rule);
2115 udata->len = ulen - 1;
2116 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2117 }
96518518 2118
96518518
PM		 2119 expr = nft_expr_first(rule);
2120 for (i = 0; i < n; i++) {
2121 err = nf_tables_newexpr(&ctx, &info[i], expr);
2122 if (err < 0)
2123 goto err2;
ef1f7df9 2124 info[i].ops = NULL;
96518518
PM		 2125 expr = nft_expr_next(expr);
2126 }
2127
96518518 2128 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
0628b123 2129 if (nft_rule_is_active_next(net, old_rule)) {
ac904ac8 2130 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
b380e5c7 2131 old_rule);
1081d11b 2132 if (trans == NULL) {
0628b123
PNA		 2133 err = -ENOMEM;
2134 goto err2;
2135 }
ee01d542 2136 nft_rule_deactivate_next(net, old_rule);
ac34b861 2137 chain->use--;
5bc5c307 2138 list_add_tail_rcu(&rule->list, &old_rule->list);
0628b123
PNA		 2139 } else {
2140 err = -ENOENT;
2141 goto err2;
2142 }
96518518 2143 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
5e948466
EL		 2144 if (old_rule)
2145 list_add_rcu(&rule->list, &old_rule->list);
2146 else
2147 list_add_tail_rcu(&rule->list, &chain->rules);
2148 else {
2149 if (old_rule)
2150 list_add_tail_rcu(&rule->list, &old_rule->list);
2151 else
2152 list_add_rcu(&rule->list, &chain->rules);
2153 }
96518518 2154
b380e5c7 2155 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
0628b123
PNA		 2156 err = -ENOMEM;
2157 goto err3;
2158 }
4fefee57 2159 chain->use++;
96518518
PM		 2160 return 0;
2161
0628b123
PNA		 2162err3:
2163 list_del_rcu(&rule->list);
96518518 2164err2:
62472bce 2165 nf_tables_rule_destroy(&ctx, rule);
96518518
PM		 2166err1:
2167 for (i = 0; i < n; i++) {
2168 if (info[i].ops != NULL)
ef1f7df9 2169 module_put(info[i].ops->type->owner);
96518518
PM		 2170 }
2171 return err;
2172}
2173
633c9a84
PNA		 2174static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2175 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 2176 const struct nlattr * const nla[])
2177{
2178 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8 2179 struct nft_af_info *afi;
7c95f6d8 2180 struct nft_table *table;
cf9dc09d
PNA		 2181 struct nft_chain *chain = NULL;
2182 struct nft_rule *rule;
0628b123
PNA		 2183 int family = nfmsg->nfgen_family, err = 0;
2184 struct nft_ctx ctx;
96518518 2185
99633ab2 2186 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 2187 if (IS_ERR(afi))
2188 return PTR_ERR(afi);
2189
9370761c 2190 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
96518518
PM		 2191 if (IS_ERR(table))
2192 return PTR_ERR(table);
2193
cf9dc09d
PNA		 2194 if (nla[NFTA_RULE_CHAIN]) {
2195 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2196 if (IS_ERR(chain))
2197 return PTR_ERR(chain);
2198 }
96518518 2199
633c9a84 2200 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0628b123 2201
cf9dc09d
PNA		 2202 if (chain) {
2203 if (nla[NFTA_RULE_HANDLE]) {
2204 rule = nf_tables_rule_lookup(chain,
2205 nla[NFTA_RULE_HANDLE]);
2206 if (IS_ERR(rule))
2207 return PTR_ERR(rule);
96518518 2208
5e266fe7 2209 err = nft_delrule(&ctx, rule);
cf9dc09d 2210 } else {
ce24b721 2211 err = nft_delrule_by_chain(&ctx);
cf9dc09d
PNA		 2212 }
2213 } else {
2214 list_for_each_entry(chain, &table->chains, list) {
2215 ctx.chain = chain;
ce24b721 2216 err = nft_delrule_by_chain(&ctx);
0628b123
PNA		 2217 if (err < 0)
2218 break;
2219 }
2220 }
2221
2222 return err;
2223}
2224
20a69341
PM		 2225/*
2226 * Sets
2227 */
2228
2229static LIST_HEAD(nf_tables_set_ops);
2230
2231int nft_register_set(struct nft_set_ops *ops)
2232{
2233 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2234 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
20a69341
PM		 2235 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2236 return 0;
2237}
2238EXPORT_SYMBOL_GPL(nft_register_set);
2239
2240void nft_unregister_set(struct nft_set_ops *ops)
2241{
2242 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2243 list_del_rcu(&ops->list);
20a69341
PM		 2244 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2245}
2246EXPORT_SYMBOL_GPL(nft_unregister_set);
2247
c50b960c
PM		 2248/*
2249 * Select a set implementation based on the data characteristics and the
2250 * given policy. The total memory use might not be known if no size is
2251 * given, in that case the amount of memory per element is used.
2252 */
2253static const struct nft_set_ops *
2254nft_select_set_ops(const struct nlattr * const nla[],
2255 const struct nft_set_desc *desc,
2256 enum nft_set_policies policy)
20a69341 2257{
c50b960c
PM		 2258 const struct nft_set_ops *ops, *bops;
2259 struct nft_set_estimate est, best;
20a69341
PM		 2260 u32 features;
2261
2262#ifdef CONFIG_MODULES
2263 if (list_empty(&nf_tables_set_ops)) {
2264 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2265 request_module("nft-set");
2266 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2267 if (!list_empty(&nf_tables_set_ops))
2268 return ERR_PTR(-EAGAIN);
2269 }
2270#endif
2271 features = 0;
2272 if (nla[NFTA_SET_FLAGS] != NULL) {
2273 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4a8678ef 2274 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT;
20a69341
PM		 2275 }
2276
c50b960c
PM		 2277 bops = NULL;
2278 best.size = ~0;
2279 best.class = ~0;
2280
20a69341
PM		 2281 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2282 if ((ops->features & features) != features)
2283 continue;
c50b960c
PM		 2284 if (!ops->estimate(desc, features, &est))
2285 continue;
2286
2287 switch (policy) {
2288 case NFT_SET_POL_PERFORMANCE:
2289 if (est.class < best.class)
2290 break;
2291 if (est.class == best.class && est.size < best.size)
2292 break;
2293 continue;
2294 case NFT_SET_POL_MEMORY:
2295 if (est.size < best.size)
2296 break;
2297 if (est.size == best.size && est.class < best.class)
2298 break;
2299 continue;
2300 default:
2301 break;
2302 }
2303
20a69341
PM		 2304 if (!try_module_get(ops->owner))
2305 continue;
c50b960c
PM		 2306 if (bops != NULL)
2307 module_put(bops->owner);
2308
2309 bops = ops;
2310 best = est;
20a69341
PM		 2311 }
2312
c50b960c
PM		 2313 if (bops != NULL)
2314 return bops;
2315
20a69341
PM		 2316 return ERR_PTR(-EOPNOTSUPP);
2317}
2318
2319static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2320 [NFTA_SET_TABLE] = { .type = NLA_STRING },
a9bdd836 2321 [NFTA_SET_NAME] = { .type = NLA_STRING,
cb39ad8b 2322 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341
PM		 2323 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2324 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2325 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2326 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2327 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
c50b960c
PM		 2328 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2329 [NFTA_SET_DESC] = { .type = NLA_NESTED },
958bee14 2330 [NFTA_SET_ID] = { .type = NLA_U32 },
761da293
PM		 2331 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2332 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
e6d8ecac
CFG		 2333 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2334 .len = NFT_USERDATA_MAXLEN },
c50b960c
PM		 2335};
2336
2337static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2338 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
20a69341
PM		 2339};
2340
633c9a84 2341static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 2342 const struct sk_buff *skb,
2343 const struct nlmsghdr *nlh,
2344 const struct nlattr * const nla[])
2345{
2346 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 2347 struct nft_af_info *afi = NULL;
2348 struct nft_table *table = NULL;
20a69341 2349
c9c8e485
PNA		 2350 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2351 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2352 if (IS_ERR(afi))
2353 return PTR_ERR(afi);
2354 }
20a69341
PM		 2355
2356 if (nla[NFTA_SET_TABLE] != NULL) {
ec2c9935
PM		 2357 if (afi == NULL)
2358 return -EAFNOSUPPORT;
2359
9370761c 2360 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
20a69341
PM		 2361 if (IS_ERR(table))
2362 return PTR_ERR(table);
2363 }
2364
633c9a84 2365 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 2366 return 0;
2367}
2368
2369struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2370 const struct nlattr *nla)
2371{
2372 struct nft_set *set;
2373
2374 if (nla == NULL)
2375 return ERR_PTR(-EINVAL);
2376
2377 list_for_each_entry(set, &table->sets, list) {
2378 if (!nla_strcmp(nla, set->name))
2379 return set;
2380 }
2381 return ERR_PTR(-ENOENT);
2382}
2383
958bee14
PNA		 2384struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2385 const struct nlattr *nla)
2386{
2387 struct nft_trans *trans;
2388 u32 id = ntohl(nla_get_be32(nla));
2389
2390 list_for_each_entry(trans, &net->nft.commit_list, list) {
2391 if (trans->msg_type == NFT_MSG_NEWSET &&
2392 id == nft_trans_set_id(trans))
2393 return nft_trans_set(trans);
2394 }
2395 return ERR_PTR(-ENOENT);
2396}
2397
20a69341
PM		 2398static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2399 const char *name)
2400{
2401 const struct nft_set *i;
2402 const char *p;
2403 unsigned long *inuse;
60eb1894 2404 unsigned int n = 0, min = 0;
20a69341 2405
cb39ad8b 2406 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
20a69341
PM		 2407 if (p != NULL) {
2408 if (p[1] != 'd' || strchr(p + 2, '%'))
2409 return -EINVAL;
2410
2411 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2412 if (inuse == NULL)
2413 return -ENOMEM;
60eb1894 2414cont:
20a69341 2415 list_for_each_entry(i, &ctx->table->sets, list) {
14662917
DB		 2416 int tmp;
2417
2418 if (!sscanf(i->name, name, &tmp))
20a69341 2419 continue;
60eb1894 2420 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
20a69341 2421 continue;
14662917 2422
60eb1894 2423 set_bit(tmp - min, inuse);
20a69341
PM		 2424 }
2425
53b70287 2426 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
60eb1894
PM		 2427 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2428 min += BITS_PER_BYTE * PAGE_SIZE;
2429 memset(inuse, 0, PAGE_SIZE);
2430 goto cont;
2431 }
20a69341
PM		 2432 free_page((unsigned long)inuse);
2433 }
2434
60eb1894 2435 snprintf(set->name, sizeof(set->name), name, min + n);
20a69341
PM		 2436 list_for_each_entry(i, &ctx->table->sets, list) {
2437 if (!strcmp(set->name, i->name))
2438 return -ENFILE;
2439 }
2440 return 0;
2441}
2442
2443static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2444 const struct nft_set *set, u16 event, u16 flags)
2445{
2446 struct nfgenmsg *nfmsg;
2447 struct nlmsghdr *nlh;
c50b960c 2448 struct nlattr *desc;
128ad332
PNA		 2449 u32 portid = ctx->portid;
2450 u32 seq = ctx->seq;
20a69341
PM		 2451
2452 event |= NFNL_SUBSYS_NFTABLES << 8;
2453 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2454 flags);
2455 if (nlh == NULL)
2456 goto nla_put_failure;
2457
2458 nfmsg = nlmsg_data(nlh);
2459 nfmsg->nfgen_family = ctx->afi->family;
2460 nfmsg->version = NFNETLINK_V0;
84d7fce6 2461 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
20a69341
PM		 2462
2463 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2464 goto nla_put_failure;
2465 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2466 goto nla_put_failure;
2467 if (set->flags != 0)
2468 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2469 goto nla_put_failure;
2470
2471 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2472 goto nla_put_failure;
2473 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2474 goto nla_put_failure;
2475 if (set->flags & NFT_SET_MAP) {
2476 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2477 goto nla_put_failure;
2478 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2479 goto nla_put_failure;
2480 }
2481
761da293 2482 if (set->timeout &&
b46f6ded
ND		 2483 nla_put_be64(skb, NFTA_SET_TIMEOUT, cpu_to_be64(set->timeout),
2484 NFTA_SET_PAD))
761da293
PM		 2485 goto nla_put_failure;
2486 if (set->gc_int &&
2487 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2488 goto nla_put_failure;
2489
9363dc4b
AB		 2490 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2491 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2492 goto nla_put_failure;
2493 }
2494
e6d8ecac
CFG		 2495 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2496 goto nla_put_failure;
2497
c50b960c
PM		 2498 desc = nla_nest_start(skb, NFTA_SET_DESC);
2499 if (desc == NULL)
2500 goto nla_put_failure;
2501 if (set->size &&
2502 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2503 goto nla_put_failure;
2504 nla_nest_end(skb, desc);
2505
053c095a
JB		 2506 nlmsg_end(skb, nlh);
2507 return 0;
20a69341
PM		 2508
2509nla_put_failure:
2510 nlmsg_trim(skb, nlh);
2511 return -1;
2512}
2513
2514static int nf_tables_set_notify(const struct nft_ctx *ctx,
2515 const struct nft_set *set,
31f8441c 2516 int event, gfp_t gfp_flags)
20a69341
PM		 2517{
2518 struct sk_buff *skb;
128ad332 2519 u32 portid = ctx->portid;
20a69341
PM		 2520 int err;
2521
128ad332
PNA		 2522 if (!ctx->report &&
2523 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
20a69341
PM		 2524 return 0;
2525
2526 err = -ENOBUFS;
31f8441c 2527 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
20a69341
PM		 2528 if (skb == NULL)
2529 goto err;
2530
2531 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2532 if (err < 0) {
2533 kfree_skb(skb);
2534 goto err;
2535 }
2536
128ad332 2537 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
31f8441c 2538 ctx->report, gfp_flags);
20a69341
PM		 2539err:
2540 if (err < 0)
99633ab2 2541 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
20a69341
PM		 2542 return err;
2543}
2544
5b96af77 2545static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
c9c8e485
PNA		 2546{
2547 const struct nft_set *set;
2548 unsigned int idx, s_idx = cb->args[0];
7c95f6d8 2549 struct nft_af_info *afi;
c9c8e485
PNA		 2550 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2551 struct net *net = sock_net(skb->sk);
2552 int cur_family = cb->args[3];
5b96af77 2553 struct nft_ctx *ctx = cb->data, ctx_set;
c9c8e485
PNA		 2554
2555 if (cb->args[1])
2556 return skb->len;
2557
e688a7f8 2558 rcu_read_lock();
38e029f1
PNA		 2559 cb->seq = net->nft.base_seq;
2560
e688a7f8 2561 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
5b96af77
PNA		 2562 if (ctx->afi && ctx->afi != afi)
2563 continue;
2564
c9c8e485
PNA		 2565 if (cur_family) {
2566 if (afi->family != cur_family)
2567 continue;
2568
2569 cur_family = 0;
2570 }
e688a7f8 2571 list_for_each_entry_rcu(table, &afi->tables, list) {
5b96af77
PNA		 2572 if (ctx->table && ctx->table != table)
2573 continue;
2574
c9c8e485
PNA		 2575 if (cur_table) {
2576 if (cur_table != table)
2577 continue;
2578
2579 cur_table = NULL;
2580 }
c9c8e485 2581 idx = 0;
5b96af77 2582 list_for_each_entry_rcu(set, &table->sets, list) {
c9c8e485
PNA		 2583 if (idx < s_idx)
2584 goto cont;
5b96af77
PNA		 2585
2586 ctx_set = *ctx;
2587 ctx_set.table = table;
2588 ctx_set.afi = afi;
2589 if (nf_tables_fill_set(skb, &ctx_set, set,
c9c8e485
PNA		 2590 NFT_MSG_NEWSET,
2591 NLM_F_MULTI) < 0) {
2592 cb->args[0] = idx;
2593 cb->args[2] = (unsigned long) table;
2594 cb->args[3] = afi->family;
2595 goto done;
2596 }
38e029f1 2597 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
c9c8e485
PNA		 2598cont:
2599 idx++;
2600 }
2601 if (s_idx)
2602 s_idx = 0;
2603 }
2604 }
2605 cb->args[1] = 1;
2606done:
e688a7f8 2607 rcu_read_unlock();
c9c8e485
PNA		 2608 return skb->len;
2609}
2610
5b96af77 2611static int nf_tables_dump_sets_done(struct netlink_callback *cb)
20a69341 2612{
5b96af77
PNA		 2613 kfree(cb->data);
2614 return 0;
20a69341
PM		 2615}
2616
7b8002a1
PNA		 2617static int nf_tables_getset(struct net *net, struct sock *nlsk,
2618 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 2619 const struct nlattr * const nla[])
2620{
2621 const struct nft_set *set;
2622 struct nft_ctx ctx;
2623 struct sk_buff *skb2;
c9c8e485 2624 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 2625 int err;
2626
01cfa0a4 2627 /* Verify existence before starting dump */
633c9a84 2628 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla);
20a69341
PM		 2629 if (err < 0)
2630 return err;
2631
2632 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2633 struct netlink_dump_control c = {
2634 .dump = nf_tables_dump_sets,
5b96af77 2635 .done = nf_tables_dump_sets_done,
20a69341 2636 };
5b96af77
PNA		 2637 struct nft_ctx *ctx_dump;
2638
2639 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2640 if (ctx_dump == NULL)
2641 return -ENOMEM;
2642
2643 *ctx_dump = ctx;
2644 c.data = ctx_dump;
2645
20a69341
PM		 2646 return netlink_dump_start(nlsk, skb, nlh, &c);
2647 }
2648
c9c8e485
PNA		 2649 /* Only accept unspec with dump */
2650 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2651 return -EAFNOSUPPORT;
eaa2bcd6
PT		 2652 if (!nla[NFTA_SET_TABLE])
2653 return -EINVAL;
c9c8e485 2654
20a69341
PM		 2655 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2656 if (IS_ERR(set))
2657 return PTR_ERR(set);
958bee14
PNA		 2658 if (set->flags & NFT_SET_INACTIVE)
2659 return -ENOENT;
20a69341
PM		 2660
2661 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2662 if (skb2 == NULL)
2663 return -ENOMEM;
2664
2665 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2666 if (err < 0)
2667 goto err;
2668
2669 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2670
2671err:
2672 kfree_skb(skb2);
2673 return err;
2674}
2675
c50b960c
PM		 2676static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2677 struct nft_set_desc *desc,
2678 const struct nlattr *nla)
2679{
2680 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2681 int err;
2682
2683 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2684 if (err < 0)
2685 return err;
2686
2687 if (da[NFTA_SET_DESC_SIZE] != NULL)
2688 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2689
2690 return 0;
2691}
2692
633c9a84
PNA		 2693static int nf_tables_newset(struct net *net, struct sock *nlsk,
2694 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 2695 const struct nlattr * const nla[])
2696{
2697 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2698 const struct nft_set_ops *ops;
7c95f6d8 2699 struct nft_af_info *afi;
20a69341
PM		 2700 struct nft_table *table;
2701 struct nft_set *set;
2702 struct nft_ctx ctx;
cb39ad8b 2703 char name[NFT_SET_MAXNAMELEN];
20a69341
PM		 2704 unsigned int size;
2705 bool create;
761da293
PM		 2706 u64 timeout;
2707 u32 ktype, dtype, flags, policy, gc_int;
c50b960c 2708 struct nft_set_desc desc;
e6d8ecac
CFG		 2709 unsigned char *udata;
2710 u16 udlen;
20a69341
PM		 2711 int err;
2712
2713 if (nla[NFTA_SET_TABLE] == NULL ||
2714 nla[NFTA_SET_NAME] == NULL ||
958bee14
PNA		 2715 nla[NFTA_SET_KEY_LEN] == NULL ||
2716 nla[NFTA_SET_ID] == NULL)
20a69341
PM		 2717 return -EINVAL;
2718
c50b960c
PM		 2719 memset(&desc, 0, sizeof(desc));
2720
20a69341
PM		 2721 ktype = NFT_DATA_VALUE;
2722 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2723 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2724 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2725 return -EINVAL;
2726 }
2727
c50b960c 2728 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
7d740264 2729 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 2730 return -EINVAL;
2731
2732 flags = 0;
2733 if (nla[NFTA_SET_FLAGS] != NULL) {
2734 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2735 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
7c6c6e95
PM		 2736 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2737 NFT_SET_MAP | NFT_SET_EVAL))
20a69341 2738 return -EINVAL;
7c6c6e95
PM		 2739 /* Only one of both operations is supported */
2740 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL)) ==
2741 (NFT_SET_MAP | NFT_SET_EVAL))
2742 return -EOPNOTSUPP;
20a69341
PM		 2743 }
2744
2745 dtype = 0;
20a69341
PM		 2746 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2747 if (!(flags & NFT_SET_MAP))
2748 return -EINVAL;
2749
2750 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2751 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2752 dtype != NFT_DATA_VERDICT)
2753 return -EINVAL;
2754
2755 if (dtype != NFT_DATA_VERDICT) {
2756 if (nla[NFTA_SET_DATA_LEN] == NULL)
2757 return -EINVAL;
c50b960c 2758 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
7d740264 2759 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 2760 return -EINVAL;
2761 } else
7d740264 2762 desc.dlen = sizeof(struct nft_verdict);
20a69341
PM		 2763 } else if (flags & NFT_SET_MAP)
2764 return -EINVAL;
2765
761da293
PM		 2766 timeout = 0;
2767 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2768 if (!(flags & NFT_SET_TIMEOUT))
2769 return -EINVAL;
2770 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_TIMEOUT]));
2771 }
2772 gc_int = 0;
2773 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2774 if (!(flags & NFT_SET_TIMEOUT))
2775 return -EINVAL;
2776 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2777 }
2778
c50b960c
PM		 2779 policy = NFT_SET_POL_PERFORMANCE;
2780 if (nla[NFTA_SET_POLICY] != NULL)
2781 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2782
2783 if (nla[NFTA_SET_DESC] != NULL) {
2784 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2785 if (err < 0)
2786 return err;
2787 }
2788
20a69341
PM		 2789 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2790
99633ab2 2791 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
20a69341
PM		 2792 if (IS_ERR(afi))
2793 return PTR_ERR(afi);
2794
9370761c 2795 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
20a69341
PM		 2796 if (IS_ERR(table))
2797 return PTR_ERR(table);
2798
633c9a84 2799 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 2800
2801 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2802 if (IS_ERR(set)) {
2803 if (PTR_ERR(set) != -ENOENT)
2804 return PTR_ERR(set);
2805 set = NULL;
2806 }
2807
2808 if (set != NULL) {
2809 if (nlh->nlmsg_flags & NLM_F_EXCL)
2810 return -EEXIST;
2811 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2812 return -EOPNOTSUPP;
2813 return 0;
2814 }
2815
2816 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2817 return -ENOENT;
2818
c50b960c 2819 ops = nft_select_set_ops(nla, &desc, policy);
20a69341
PM		 2820 if (IS_ERR(ops))
2821 return PTR_ERR(ops);
2822
e6d8ecac
CFG		 2823 udlen = 0;
2824 if (nla[NFTA_SET_USERDATA])
2825 udlen = nla_len(nla[NFTA_SET_USERDATA]);
2826
20a69341
PM		 2827 size = 0;
2828 if (ops->privsize != NULL)
2829 size = ops->privsize(nla);
2830
2831 err = -ENOMEM;
e6d8ecac 2832 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
20a69341
PM		 2833 if (set == NULL)
2834 goto err1;
2835
2836 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2837 err = nf_tables_set_alloc_name(&ctx, set, name);
2838 if (err < 0)
2839 goto err2;
2840
e6d8ecac
CFG		 2841 udata = NULL;
2842 if (udlen) {
2843 udata = set->data + size;
2844 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
2845 }
2846
20a69341 2847 INIT_LIST_HEAD(&set->bindings);
cc02e457 2848 write_pnet(&set->pnet, net);
20a69341
PM		 2849 set->ops = ops;
2850 set->ktype = ktype;
c50b960c 2851 set->klen = desc.klen;
20a69341 2852 set->dtype = dtype;
c50b960c 2853 set->dlen = desc.dlen;
20a69341 2854 set->flags = flags;
c50b960c 2855 set->size = desc.size;
9363dc4b 2856 set->policy = policy;
e6d8ecac
CFG		 2857 set->udlen = udlen;
2858 set->udata = udata;
761da293
PM		 2859 set->timeout = timeout;
2860 set->gc_int = gc_int;
20a69341 2861
c50b960c 2862 err = ops->init(set, &desc, nla);
20a69341
PM		 2863 if (err < 0)
2864 goto err2;
2865
958bee14 2866 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
20a69341
PM		 2867 if (err < 0)
2868 goto err2;
2869
e688a7f8 2870 list_add_tail_rcu(&set->list, &table->sets);
4fefee57 2871 table->use++;
20a69341
PM		 2872 return 0;
2873
2874err2:
2875 kfree(set);
2876err1:
2877 module_put(ops->owner);
2878 return err;
2879}
2880
958bee14 2881static void nft_set_destroy(struct nft_set *set)
20a69341 2882{
20a69341
PM		 2883 set->ops->destroy(set);
2884 module_put(set->ops->owner);
2885 kfree(set);
2886}
2887
958bee14
PNA		 2888static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2889{
e688a7f8 2890 list_del_rcu(&set->list);
31f8441c 2891 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
958bee14
PNA		 2892 nft_set_destroy(set);
2893}
2894
633c9a84
PNA		 2895static int nf_tables_delset(struct net *net, struct sock *nlsk,
2896 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 2897 const struct nlattr * const nla[])
2898{
c9c8e485 2899 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 2900 struct nft_set *set;
2901 struct nft_ctx ctx;
2902 int err;
2903
ec2c9935
PM		 2904 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2905 return -EAFNOSUPPORT;
20a69341
PM		 2906 if (nla[NFTA_SET_TABLE] == NULL)
2907 return -EINVAL;
2908
633c9a84 2909 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla);
20a69341
PM		 2910 if (err < 0)
2911 return err;
2912
2913 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2914 if (IS_ERR(set))
2915 return PTR_ERR(set);
2916 if (!list_empty(&set->bindings))
2917 return -EBUSY;
2918
ee01d542 2919 return nft_delset(&ctx, set);
20a69341
PM		 2920}
2921
2922static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2923 const struct nft_set *set,
2924 const struct nft_set_iter *iter,
2925 const struct nft_set_elem *elem)
2926{
fe2811eb 2927 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 2928 enum nft_registers dreg;
2929
2930 dreg = nft_type_to_reg(set->dtype);
1ec10212
PM		 2931 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
2932 set->dtype == NFT_DATA_VERDICT ?
2933 NFT_DATA_VERDICT : NFT_DATA_VALUE,
2934 set->dlen);
20a69341
PM		 2935}
2936
2937int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2938 struct nft_set_binding *binding)
2939{
2940 struct nft_set_binding *i;
2941 struct nft_set_iter iter;
2942
2943 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2944 return -EBUSY;
2945
11113e19 2946 if (binding->flags & NFT_SET_MAP) {
20a69341
PM		 2947 /* If the set is already bound to the same chain all
2948 * jumps are already validated for that chain.
2949 */
2950 list_for_each_entry(i, &set->bindings, list) {
a4684402 2951 if (i->flags & NFT_SET_MAP &&
11113e19 2952 i->chain == binding->chain)
20a69341
PM		 2953 goto bind;
2954 }
2955
8588ac09 2956 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 2957 iter.skip = 0;
2958 iter.count = 0;
2959 iter.err = 0;
2960 iter.fn = nf_tables_bind_check_setelem;
2961
2962 set->ops->walk(ctx, set, &iter);
a02f4248 2963 if (iter.err < 0)
20a69341 2964 return iter.err;
20a69341
PM		 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
8588ac09
PNA		 3193 args.cb = cb;
3194 args.skb = skb;
3195 args.iter.genmask = nft_genmask_cur(ctx.net);
3196 args.iter.skip = cb->args[0];
3197 args.iter.count = 0;
3198 args.iter.err = 0;
3199 args.iter.fn = nf_tables_dump_setelem;
20a69341
PM		 3200 set->ops->walk(&ctx, set, &args.iter);
3201
3202 nla_nest_end(skb, nest);
3203 nlmsg_end(skb, nlh);
3204
3205 if (args.iter.err && args.iter.err != -EMSGSIZE)
3206 return args.iter.err;
3207 if (args.iter.count == cb->args[0])
3208 return 0;
3209
3210 cb->args[0] = args.iter.count;
3211 return skb->len;
3212
3213nla_put_failure:
3214 return -ENOSPC;
3215}
3216
7b8002a1
PNA		 3217static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3218 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3219 const struct nlattr * const nla[])
3220{
3221 const struct nft_set *set;
3222 struct nft_ctx ctx;
3223 int err;
3224
f4c756b4 3225 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla);
20a69341
PM		 3226 if (err < 0)
3227 return err;
f4c756b4
PNA		 3228 if (ctx.table->flags & NFT_TABLE_INACTIVE)
3229 return -ENOENT;
20a69341
PM		 3230
3231 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3232 if (IS_ERR(set))
3233 return PTR_ERR(set);
958bee14
PNA		 3234 if (set->flags & NFT_SET_INACTIVE)
3235 return -ENOENT;
20a69341
PM		 3236
3237 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3238 struct netlink_dump_control c = {
3239 .dump = nf_tables_dump_set,
3240 };
3241 return netlink_dump_start(nlsk, skb, nlh, &c);
3242 }
3243 return -EOPNOTSUPP;
3244}
3245
d60ce62f
AB		 3246static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3247 const struct nft_ctx *ctx, u32 seq,
3248 u32 portid, int event, u16 flags,
3249 const struct nft_set *set,
3250 const struct nft_set_elem *elem)
3251{
3252 struct nfgenmsg *nfmsg;
3253 struct nlmsghdr *nlh;
3254 struct nlattr *nest;
3255 int err;
3256
3257 event |= NFNL_SUBSYS_NFTABLES << 8;
3258 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3259 flags);
3260 if (nlh == NULL)
3261 goto nla_put_failure;
3262
3263 nfmsg = nlmsg_data(nlh);
3264 nfmsg->nfgen_family = ctx->afi->family;
3265 nfmsg->version = NFNETLINK_V0;
84d7fce6 3266 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
d60ce62f
AB		 3267
3268 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3269 goto nla_put_failure;
3270 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3271 goto nla_put_failure;
3272
3273 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3274 if (nest == NULL)
3275 goto nla_put_failure;
3276
3277 err = nf_tables_fill_setelem(skb, set, elem);
3278 if (err < 0)
3279 goto nla_put_failure;
3280
3281 nla_nest_end(skb, nest);
3282
053c095a
JB		 3283 nlmsg_end(skb, nlh);
3284 return 0;
d60ce62f
AB		 3285
3286nla_put_failure:
3287 nlmsg_trim(skb, nlh);
3288 return -1;
3289}
3290
3291static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3292 const struct nft_set *set,
3293 const struct nft_set_elem *elem,
3294 int event, u16 flags)
3295{
128ad332
PNA		 3296 struct net *net = ctx->net;
3297 u32 portid = ctx->portid;
d60ce62f
AB		 3298 struct sk_buff *skb;
3299 int err;
3300
128ad332 3301 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
d60ce62f
AB		 3302 return 0;
3303
3304 err = -ENOBUFS;
3305 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3306 if (skb == NULL)
3307 goto err;
3308
3309 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3310 set, elem);
3311 if (err < 0) {
3312 kfree_skb(skb);
3313 goto err;
3314 }
3315
128ad332 3316 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
d60ce62f
AB		 3317 GFP_KERNEL);
3318err:
3319 if (err < 0)
3320 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3321 return err;
3322}
3323
60319eb1
PNA		 3324static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3325 int msg_type,
3326 struct nft_set *set)
3327{
3328 struct nft_trans *trans;
3329
3330 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3331 if (trans == NULL)
3332 return NULL;
3333
3334 nft_trans_elem_set(trans) = set;
3335 return trans;
3336}
3337
22fe54d5
PM		 3338void *nft_set_elem_init(const struct nft_set *set,
3339 const struct nft_set_ext_tmpl *tmpl,
49499c3e 3340 const u32 *key, const u32 *data,
22fe54d5 3341 u64 timeout, gfp_t gfp)
fe2811eb
PM		 3342{
3343 struct nft_set_ext *ext;
3344 void *elem;
3345
3346 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3347 if (elem == NULL)
3348 return NULL;
3349
3350 ext = nft_set_elem_ext(set, elem);
3351 nft_set_ext_init(ext, tmpl);
3352
3353 memcpy(nft_set_ext_key(ext), key, set->klen);
3354 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3355 memcpy(nft_set_ext_data(ext), data, set->dlen);
c3e1b005
PM		 3356 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3357 *nft_set_ext_expiration(ext) =
3358 jiffies + msecs_to_jiffies(timeout);
3359 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3360 *nft_set_ext_timeout(ext) = timeout;
fe2811eb
PM		 3361
3362 return elem;
3363}
3364
61edafbb
PM		 3365void nft_set_elem_destroy(const struct nft_set *set, void *elem)
3366{
3367 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3368
3369 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3370 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3371 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
f25ad2e9
PM		 3372 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3373 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
61edafbb
PM		 3374
3375 kfree(elem);
3376}
3377EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3378
0e9091d6
PNA		 3379static int nft_setelem_parse_flags(const struct nft_set *set,
3380 const struct nlattr *attr, u32 *flags)
3381{
3382 if (attr == NULL)
3383 return 0;
3384
3385 *flags = ntohl(nla_get_be32(attr));
3386 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3387 return -EINVAL;
3388 if (!(set->flags & NFT_SET_INTERVAL) &&
3389 *flags & NFT_SET_ELEM_INTERVAL_END)
3390 return -EINVAL;
3391
3392 return 0;
3393}
3394
60319eb1 3395static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 3396 const struct nlattr *attr)
3397{
3398 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3399 struct nft_data_desc d1, d2;
fe2811eb
PM		 3400 struct nft_set_ext_tmpl tmpl;
3401 struct nft_set_ext *ext;
20a69341
PM		 3402 struct nft_set_elem elem;
3403 struct nft_set_binding *binding;
68e942e8 3404 struct nft_userdata *udata;
fe2811eb 3405 struct nft_data data;
20a69341 3406 enum nft_registers dreg;
60319eb1 3407 struct nft_trans *trans;
0e9091d6 3408 u32 flags = 0;
c3e1b005 3409 u64 timeout;
68e942e8 3410 u8 ulen;
20a69341
PM		 3411 int err;
3412
3413 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3414 nft_set_elem_policy);
3415 if (err < 0)
3416 return err;
3417
3418 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3419 return -EINVAL;
3420
fe2811eb
PM		 3421 nft_set_ext_prepare(&tmpl);
3422
0e9091d6
PNA		 3423 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3424 if (err < 0)
3425 return err;
3426 if (flags != 0)
3427 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
20a69341
PM		 3428
3429 if (set->flags & NFT_SET_MAP) {
3430 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
fe2811eb 3431 !(flags & NFT_SET_ELEM_INTERVAL_END))
20a69341 3432 return -EINVAL;
bd7fc645 3433 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
fe2811eb 3434 flags & NFT_SET_ELEM_INTERVAL_END)
bd7fc645 3435 return -EINVAL;
20a69341
PM		 3436 } else {
3437 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3438 return -EINVAL;
3439 }
3440
c3e1b005
PM		 3441 timeout = 0;
3442 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3443 if (!(set->flags & NFT_SET_TIMEOUT))
3444 return -EINVAL;
3445 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_ELEM_TIMEOUT]));
3446 } else if (set->flags & NFT_SET_TIMEOUT) {
3447 timeout = set->timeout;
3448 }
3449
7d740264 3450 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
d0a11fc3 3451 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 3452 if (err < 0)
3453 goto err1;
3454 err = -EINVAL;
3455 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3456 goto err2;
3457
7d740264 3458 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
c3e1b005
PM		 3459 if (timeout > 0) {
3460 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3461 if (timeout != set->timeout)
3462 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3463 }
fe2811eb 3464
20a69341 3465 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
d0a11fc3
PM		 3466 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3467 nla[NFTA_SET_ELEM_DATA]);
20a69341
PM		 3468 if (err < 0)
3469 goto err2;
3470
3471 err = -EINVAL;
3472 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3473 goto err3;
3474
3475 dreg = nft_type_to_reg(set->dtype);
3476 list_for_each_entry(binding, &set->bindings, list) {
3477 struct nft_ctx bind_ctx = {
3478 .afi = ctx->afi,
3479 .table = ctx->table,
7c95f6d8 3480 .chain = (struct nft_chain *)binding->chain,
20a69341
PM		 3481 };
3482
11113e19
PM		 3483 if (!(binding->flags & NFT_SET_MAP))
3484 continue;
3485
1ec10212
PM		 3486 err = nft_validate_register_store(&bind_ctx, dreg,
3487 &data,
3488 d2.type, d2.len);
20a69341
PM		 3489 if (err < 0)
3490 goto err3;
3491 }
fe2811eb 3492
7d740264 3493 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
20a69341
PM		 3494 }
3495
68e942e8
PM		 3496 /* The full maximum length of userdata can exceed the maximum
3497 * offset value (U8_MAX) for following extensions, therefor it
3498 * must be the last extension added.
3499 */
3500 ulen = 0;
3501 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3502 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3503 if (ulen > 0)
3504 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3505 ulen);
3506 }
3507
fe2811eb 3508 err = -ENOMEM;
7d740264 3509 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
c3e1b005 3510 timeout, GFP_KERNEL);
fe2811eb
PM		 3511 if (elem.priv == NULL)
3512 goto err3;
3513
3514 ext = nft_set_elem_ext(set, elem.priv);
3515 if (flags)
3516 *nft_set_ext_flags(ext) = flags;
68e942e8
PM		 3517 if (ulen > 0) {
3518 udata = nft_set_ext_userdata(ext);
3519 udata->len = ulen - 1;
3520 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3521 }
fe2811eb 3522
60319eb1
PNA		 3523 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3524 if (trans == NULL)
fe2811eb 3525 goto err4;
60319eb1 3526
69086658 3527 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
20a69341
PM		 3528 err = set->ops->insert(set, &elem);
3529 if (err < 0)
fe2811eb 3530 goto err5;
20a69341 3531
60319eb1 3532 nft_trans_elem(trans) = elem;
46bbafce 3533 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
20a69341
PM		 3534 return 0;
3535
fe2811eb 3536err5:
60319eb1 3537 kfree(trans);
fe2811eb
PM		 3538err4:
3539 kfree(elem.priv);
20a69341
PM		 3540err3:
3541 if (nla[NFTA_SET_ELEM_DATA] != NULL)
fe2811eb 3542 nft_data_uninit(&data, d2.type);
20a69341 3543err2:
7d740264 3544 nft_data_uninit(&elem.key.val, d1.type);
20a69341
PM		 3545err1:
3546 return err;
3547}
3548
633c9a84
PNA		 3549static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3550 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3551 const struct nlattr * const nla[])
3552{
3553 const struct nlattr *attr;
3554 struct nft_set *set;
3555 struct nft_ctx ctx;
60319eb1 3556 int rem, err = 0;
20a69341 3557
7d5570ca
PNA		 3558 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3559 return -EINVAL;
3560
f4c756b4 3561 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla);
20a69341
PM		 3562 if (err < 0)
3563 return err;
3564
3565 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
958bee14
PNA		 3566 if (IS_ERR(set)) {
3567 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3568 set = nf_tables_set_lookup_byid(net,
3569 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3570 }
3571 if (IS_ERR(set))
3572 return PTR_ERR(set);
3573 }
3574
20a69341
PM		 3575 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3576 return -EBUSY;
3577
3578 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3dd0673a
PM		 3579 if (set->size &&
3580 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact))
3581 return -ENFILE;
3582
20a69341 3583 err = nft_add_set_elem(&ctx, set, attr);
3dd0673a
PM		 3584 if (err < 0) {
3585 atomic_dec(&set->nelems);
60319eb1 3586 break;
3dd0673a 3587 }
20a69341 3588 }
60319eb1 3589 return err;
20a69341
PM		 3590}
3591
60319eb1 3592static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 3593 const struct nlattr *attr)
3594{
3595 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3971ca14 3596 struct nft_set_ext_tmpl tmpl;
20a69341
PM		 3597 struct nft_data_desc desc;
3598 struct nft_set_elem elem;
3971ca14 3599 struct nft_set_ext *ext;
60319eb1 3600 struct nft_trans *trans;
3971ca14
PNA		 3601 u32 flags = 0;
3602 void *priv;
20a69341
PM		 3603 int err;
3604
3605 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3606 nft_set_elem_policy);
3607 if (err < 0)
3608 goto err1;
3609
3610 err = -EINVAL;
3611 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3612 goto err1;
3613
3971ca14
PNA		 3614 nft_set_ext_prepare(&tmpl);
3615
3616 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3617 if (err < 0)
3618 return err;
3619 if (flags != 0)
3620 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3621
7d740264 3622 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
d0a11fc3 3623 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 3624 if (err < 0)
3625 goto err1;
3626
3627 err = -EINVAL;
3628 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3629 goto err2;
3630
3971ca14
PNA		 3631 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3632
3633 err = -ENOMEM;
3634 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3635 GFP_KERNEL);
3636 if (elem.priv == NULL)
3637 goto err2;
3638
3639 ext = nft_set_elem_ext(set, elem.priv);
3640 if (flags)
3641 *nft_set_ext_flags(ext) = flags;
3642
60319eb1 3643 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
609ccf08
JL		 3644 if (trans == NULL) {
3645 err = -ENOMEM;
3971ca14 3646 goto err3;
609ccf08 3647 }
20a69341 3648
3971ca14
PNA		 3649 priv = set->ops->deactivate(set, &elem);
3650 if (priv == NULL) {
cc02e457 3651 err = -ENOENT;
3971ca14 3652 goto err4;
cc02e457 3653 }
3971ca14
PNA		 3654 kfree(elem.priv);
3655 elem.priv = priv;
cc02e457 3656
60319eb1 3657 nft_trans_elem(trans) = elem;
46bbafce 3658 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
0dc13625 3659 return 0;
cc02e457 3660
3971ca14 3661err4:
cc02e457 3662 kfree(trans);
3971ca14
PNA		 3663err3:
3664 kfree(elem.priv);
20a69341 3665err2:
7d740264 3666 nft_data_uninit(&elem.key.val, desc.type);
20a69341
PM		 3667err1:
3668 return err;
3669}
3670
633c9a84
PNA		 3671static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3672 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3673 const struct nlattr * const nla[])
3674{
3675 const struct nlattr *attr;
3676 struct nft_set *set;
3677 struct nft_ctx ctx;
60319eb1 3678 int rem, err = 0;
20a69341 3679
7d5570ca
PNA		 3680 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3681 return -EINVAL;
3682
f4c756b4 3683 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla);
20a69341
PM		 3684 if (err < 0)
3685 return err;
3686
3687 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3688 if (IS_ERR(set))
3689 return PTR_ERR(set);
3690 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3691 return -EBUSY;
3692
3693 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3694 err = nft_del_setelem(&ctx, set, attr);
3695 if (err < 0)
60319eb1 3696 break;
4fefee57 3697
3dd0673a 3698 set->ndeact++;
20a69341 3699 }
60319eb1 3700 return err;
20a69341
PM		 3701}
3702
cfed7e1b
PM		 3703void nft_set_gc_batch_release(struct rcu_head *rcu)
3704{
3705 struct nft_set_gc_batch *gcb;
3706 unsigned int i;
3707
3708 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
3709 for (i = 0; i < gcb->head.cnt; i++)
3710 nft_set_elem_destroy(gcb->head.set, gcb->elems[i]);
3711 kfree(gcb);
3712}
3713EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
3714
3715struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
3716 gfp_t gfp)
3717{
3718 struct nft_set_gc_batch *gcb;
3719
3720 gcb = kzalloc(sizeof(*gcb), gfp);
3721 if (gcb == NULL)
3722 return gcb;
3723 gcb->head.set = set;
3724 return gcb;
3725}
3726EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
3727
84d7fce6
PNA		 3728static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
3729 u32 portid, u32 seq)
3730{
3731 struct nlmsghdr *nlh;
3732 struct nfgenmsg *nfmsg;
3733 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
3734
3735 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
3736 if (nlh == NULL)
3737 goto nla_put_failure;
3738
3739 nfmsg = nlmsg_data(nlh);
3740 nfmsg->nfgen_family = AF_UNSPEC;
3741 nfmsg->version = NFNETLINK_V0;
3742 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3743
3744 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
3745 goto nla_put_failure;
3746
053c095a
JB		 3747 nlmsg_end(skb, nlh);
3748 return 0;
84d7fce6
PNA		 3749
3750nla_put_failure:
3751 nlmsg_trim(skb, nlh);
3752 return -EMSGSIZE;
3753}
3754
3755static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
3756{
3757 struct nlmsghdr *nlh = nlmsg_hdr(skb);
3758 struct sk_buff *skb2;
3759 int err;
3760
3761 if (nlmsg_report(nlh) &&
3762 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3763 return 0;
3764
3765 err = -ENOBUFS;
3766 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3767 if (skb2 == NULL)
3768 goto err;
3769
3770 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3771 nlh->nlmsg_seq);
3772 if (err < 0) {
3773 kfree_skb(skb2);
3774 goto err;
3775 }
3776
3777 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
3778 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
3779err:
3780 if (err < 0) {
3781 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
3782 err);
3783 }
3784 return err;
3785}
3786
7b8002a1
PNA		 3787static int nf_tables_getgen(struct net *net, struct sock *nlsk,
3788 struct sk_buff *skb, const struct nlmsghdr *nlh,
84d7fce6
PNA		 3789 const struct nlattr * const nla[])
3790{
84d7fce6
PNA		 3791 struct sk_buff *skb2;
3792 int err;
3793
3794 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3795 if (skb2 == NULL)
3796 return -ENOMEM;
3797
3798 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3799 nlh->nlmsg_seq);
3800 if (err < 0)
3801 goto err;
3802
3803 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3804err:
3805 kfree_skb(skb2);
3806 return err;
3807}
3808
96518518
PM		 3809static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3810 [NFT_MSG_NEWTABLE] = {
55dd6f93 3811 .call_batch = nf_tables_newtable,
96518518
PM		 3812 .attr_count = NFTA_TABLE_MAX,
3813 .policy = nft_table_policy,
3814 },
3815 [NFT_MSG_GETTABLE] = {
3816 .call = nf_tables_gettable,
3817 .attr_count = NFTA_TABLE_MAX,
3818 .policy = nft_table_policy,
3819 },
3820 [NFT_MSG_DELTABLE] = {
55dd6f93 3821 .call_batch = nf_tables_deltable,
96518518
PM		 3822 .attr_count = NFTA_TABLE_MAX,
3823 .policy = nft_table_policy,
3824 },
3825 [NFT_MSG_NEWCHAIN] = {
91c7b38d 3826 .call_batch = nf_tables_newchain,
96518518
PM		 3827 .attr_count = NFTA_CHAIN_MAX,
3828 .policy = nft_chain_policy,
3829 },
3830 [NFT_MSG_GETCHAIN] = {
3831 .call = nf_tables_getchain,
3832 .attr_count = NFTA_CHAIN_MAX,
3833 .policy = nft_chain_policy,
3834 },
3835 [NFT_MSG_DELCHAIN] = {
91c7b38d 3836 .call_batch = nf_tables_delchain,
96518518
PM		 3837 .attr_count = NFTA_CHAIN_MAX,
3838 .policy = nft_chain_policy,
3839 },
3840 [NFT_MSG_NEWRULE] = {
0628b123 3841 .call_batch = nf_tables_newrule,
96518518
PM		 3842 .attr_count = NFTA_RULE_MAX,
3843 .policy = nft_rule_policy,
3844 },
3845 [NFT_MSG_GETRULE] = {
3846 .call = nf_tables_getrule,
3847 .attr_count = NFTA_RULE_MAX,
3848 .policy = nft_rule_policy,
3849 },
3850 [NFT_MSG_DELRULE] = {
0628b123 3851 .call_batch = nf_tables_delrule,
96518518
PM		 3852 .attr_count = NFTA_RULE_MAX,
3853 .policy = nft_rule_policy,
3854 },
20a69341 3855 [NFT_MSG_NEWSET] = {
958bee14 3856 .call_batch = nf_tables_newset,
20a69341
PM		 3857 .attr_count = NFTA_SET_MAX,
3858 .policy = nft_set_policy,
3859 },
3860 [NFT_MSG_GETSET] = {
3861 .call = nf_tables_getset,
3862 .attr_count = NFTA_SET_MAX,
3863 .policy = nft_set_policy,
3864 },
3865 [NFT_MSG_DELSET] = {
958bee14 3866 .call_batch = nf_tables_delset,
20a69341
PM		 3867 .attr_count = NFTA_SET_MAX,
3868 .policy = nft_set_policy,
3869 },
3870 [NFT_MSG_NEWSETELEM] = {
958bee14 3871 .call_batch = nf_tables_newsetelem,
20a69341
PM		 3872 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3873 .policy = nft_set_elem_list_policy,
3874 },
3875 [NFT_MSG_GETSETELEM] = {
3876 .call = nf_tables_getsetelem,
3877 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3878 .policy = nft_set_elem_list_policy,
3879 },
3880 [NFT_MSG_DELSETELEM] = {
958bee14 3881 .call_batch = nf_tables_delsetelem,
20a69341
PM		 3882 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3883 .policy = nft_set_elem_list_policy,
3884 },
84d7fce6
PNA		 3885 [NFT_MSG_GETGEN] = {
3886 .call = nf_tables_getgen,
3887 },
96518518
PM		 3888};
3889
91c7b38d
PNA		 3890static void nft_chain_commit_update(struct nft_trans *trans)
3891{
3892 struct nft_base_chain *basechain;
3893
3894 if (nft_trans_chain_name(trans)[0])
3895 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3896
3897 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3898 return;
3899
3900 basechain = nft_base_chain(trans->ctx.chain);
3901 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3902
3903 switch (nft_trans_chain_policy(trans)) {
3904 case NF_DROP:
3905 case NF_ACCEPT:
3906 basechain->policy = nft_trans_chain_policy(trans);
3907 break;
3908 }
3909}
3910
b326dd37 3911static void nf_tables_commit_release(struct nft_trans *trans)
c7c32e72 3912{
c7c32e72
PNA		 3913 switch (trans->msg_type) {
3914 case NFT_MSG_DELTABLE:
3915 nf_tables_table_destroy(&trans->ctx);
3916 break;
3917 case NFT_MSG_DELCHAIN:
3918 nf_tables_chain_destroy(trans->ctx.chain);
3919 break;
3920 case NFT_MSG_DELRULE:
3921 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3922 break;
3923 case NFT_MSG_DELSET:
3924 nft_set_destroy(nft_trans_set(trans));
3925 break;
61edafbb
PM		 3926 case NFT_MSG_DELSETELEM:
3927 nft_set_elem_destroy(nft_trans_elem_set(trans),
3928 nft_trans_elem(trans).priv);
3929 break;
c7c32e72
PNA		 3930 }
3931 kfree(trans);
3932}
3933
5913beaf 3934static int nf_tables_commit(struct net *net, struct sk_buff *skb)
37082f93 3935{
37082f93 3936 struct nft_trans *trans, *next;
a3716e70 3937 struct nft_trans_elem *te;
37082f93
PNA		 3938
3939 /* Bump generation counter, invalidate any dump in progress */
38e029f1 3940 while (++net->nft.base_seq == 0);
37082f93
PNA		 3941
3942 /* A new generation has just started */
ea4bd995 3943 net->nft.gencursor = nft_gencursor_next(net);
37082f93
PNA		 3944
3945 /* Make sure all packets have left the previous generation before
3946 * purging old rules.
3947 */
3948 synchronize_rcu();
3949
3950 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
b380e5c7 3951 switch (trans->msg_type) {
55dd6f93
PNA		 3952 case NFT_MSG_NEWTABLE:
3953 if (nft_trans_table_update(trans)) {
3954 if (!nft_trans_table_enable(trans)) {
3955 nf_tables_table_disable(trans->ctx.afi,
3956 trans->ctx.table);
3957 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3958 }
3959 } else {
3960 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3961 }
35151d84 3962 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
55dd6f93
PNA		 3963 nft_trans_destroy(trans);
3964 break;
3965 case NFT_MSG_DELTABLE:
35151d84 3966 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
55dd6f93 3967 break;
91c7b38d
PNA		 3968 case NFT_MSG_NEWCHAIN:
3969 if (nft_trans_chain_update(trans))
3970 nft_chain_commit_update(trans);
4fefee57 3971 else
91c7b38d 3972 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
4fefee57 3973
35151d84 3974 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
91c7b38d
PNA		 3975 nft_trans_destroy(trans);
3976 break;
3977 case NFT_MSG_DELCHAIN:
35151d84 3978 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
c5598794
AB		 3979 nf_tables_unregister_hooks(trans->ctx.table,
3980 trans->ctx.chain,
3981 trans->ctx.afi->nops);
91c7b38d 3982 break;
b380e5c7
PNA		 3983 case NFT_MSG_NEWRULE:
3984 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
35151d84 3985 nf_tables_rule_notify(&trans->ctx,
37082f93 3986 nft_trans_rule(trans),
35151d84 3987 NFT_MSG_NEWRULE);
37082f93 3988 nft_trans_destroy(trans);
b380e5c7
PNA		 3989 break;
3990 case NFT_MSG_DELRULE:
3991 list_del_rcu(&nft_trans_rule(trans)->list);
35151d84
PNA		 3992 nf_tables_rule_notify(&trans->ctx,
3993 nft_trans_rule(trans),
3994 NFT_MSG_DELRULE);
b380e5c7 3995 break;
958bee14
PNA		 3996 case NFT_MSG_NEWSET:
3997 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
4fefee57
PNA		 3998 /* This avoids hitting -EBUSY when deleting the table
3999 * from the transaction.
4000 */
4001 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4002 !list_empty(&nft_trans_set(trans)->bindings))
4003 trans->ctx.table->use--;
4004
958bee14 4005 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 4006 NFT_MSG_NEWSET, GFP_KERNEL);
958bee14
PNA		 4007 nft_trans_destroy(trans);
4008 break;
4009 case NFT_MSG_DELSET:
4010 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 4011 NFT_MSG_DELSET, GFP_KERNEL);
958bee14 4012 break;
60319eb1 4013 case NFT_MSG_NEWSETELEM:
cc02e457
PM		 4014 te = (struct nft_trans_elem *)trans->data;
4015
4016 te->set->ops->activate(te->set, &te->elem);
4017 nf_tables_setelem_notify(&trans->ctx, te->set,
4018 &te->elem,
60319eb1
PNA		 4019 NFT_MSG_NEWSETELEM, 0);
4020 nft_trans_destroy(trans);
4021 break;
4022 case NFT_MSG_DELSETELEM:
a3716e70 4023 te = (struct nft_trans_elem *)trans->data;
fe2811eb 4024
a3716e70
PNA		 4025 nf_tables_setelem_notify(&trans->ctx, te->set,
4026 &te->elem,
60319eb1 4027 NFT_MSG_DELSETELEM, 0);
02263db0 4028 te->set->ops->remove(te->set, &te->elem);
3dd0673a
PM		 4029 atomic_dec(&te->set->nelems);
4030 te->set->ndeact--;
60319eb1 4031 break;
37082f93 4032 }
37082f93
PNA		 4033 }
4034
b326dd37
PNA		 4035 synchronize_rcu();
4036
37082f93 4037 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
c7c32e72 4038 list_del(&trans->list);
b326dd37 4039 nf_tables_commit_release(trans);
37082f93 4040 }
84d7fce6
PNA		 4041
4042 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
37082f93
PNA		 4043
4044 return 0;
4045}
4046
b326dd37 4047static void nf_tables_abort_release(struct nft_trans *trans)
c7c32e72 4048{
c7c32e72
PNA		 4049 switch (trans->msg_type) {
4050 case NFT_MSG_NEWTABLE:
4051 nf_tables_table_destroy(&trans->ctx);
4052 break;
4053 case NFT_MSG_NEWCHAIN:
4054 nf_tables_chain_destroy(trans->ctx.chain);
4055 break;
4056 case NFT_MSG_NEWRULE:
4057 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4058 break;
4059 case NFT_MSG_NEWSET:
4060 nft_set_destroy(nft_trans_set(trans));
4061 break;
61edafbb
PM		 4062 case NFT_MSG_NEWSETELEM:
4063 nft_set_elem_destroy(nft_trans_elem_set(trans),
4064 nft_trans_elem(trans).priv);
4065 break;
c7c32e72
PNA		 4066 }
4067 kfree(trans);
4068}
4069
5913beaf 4070static int nf_tables_abort(struct net *net, struct sk_buff *skb)
37082f93 4071{
37082f93 4072 struct nft_trans *trans, *next;
02263db0 4073 struct nft_trans_elem *te;
37082f93 4074
a907e36d
XL		 4075 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4076 list) {
b380e5c7 4077 switch (trans->msg_type) {
55dd6f93
PNA		 4078 case NFT_MSG_NEWTABLE:
4079 if (nft_trans_table_update(trans)) {
4080 if (nft_trans_table_enable(trans)) {
4081 nf_tables_table_disable(trans->ctx.afi,
4082 trans->ctx.table);
4083 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4084 }
4085 nft_trans_destroy(trans);
4086 } else {
e688a7f8 4087 list_del_rcu(&trans->ctx.table->list);
55dd6f93
PNA		 4088 }
4089 break;
4090 case NFT_MSG_DELTABLE:
e688a7f8
PNA		 4091 list_add_tail_rcu(&trans->ctx.table->list,
4092 &trans->ctx.afi->tables);
55dd6f93
PNA		 4093 nft_trans_destroy(trans);
4094 break;
91c7b38d
PNA		 4095 case NFT_MSG_NEWCHAIN:
4096 if (nft_trans_chain_update(trans)) {
982f4051 4097 free_percpu(nft_trans_chain_stats(trans));
91c7b38d
PNA		 4098
4099 nft_trans_destroy(trans);
4100 } else {
4fefee57 4101 trans->ctx.table->use--;
e688a7f8 4102 list_del_rcu(&trans->ctx.chain->list);
c5598794
AB		 4103 nf_tables_unregister_hooks(trans->ctx.table,
4104 trans->ctx.chain,
4105 trans->ctx.afi->nops);
91c7b38d
PNA		 4106 }
4107 break;
4108 case NFT_MSG_DELCHAIN:
4fefee57 4109 trans->ctx.table->use++;
e688a7f8
PNA		 4110 list_add_tail_rcu(&trans->ctx.chain->list,
4111 &trans->ctx.table->chains);
91c7b38d
PNA		 4112 nft_trans_destroy(trans);
4113 break;
b380e5c7 4114 case NFT_MSG_NEWRULE:
4fefee57 4115 trans->ctx.chain->use--;
b380e5c7
PNA		 4116 list_del_rcu(&nft_trans_rule(trans)->list);
4117 break;
4118 case NFT_MSG_DELRULE:
4fefee57 4119 trans->ctx.chain->use++;
b380e5c7 4120 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
37082f93 4121 nft_trans_destroy(trans);
b380e5c7 4122 break;
958bee14 4123 case NFT_MSG_NEWSET:
4fefee57 4124 trans->ctx.table->use--;
e688a7f8 4125 list_del_rcu(&nft_trans_set(trans)->list);
958bee14
PNA		 4126 break;
4127 case NFT_MSG_DELSET:
4fefee57 4128 trans->ctx.table->use++;
e688a7f8
PNA		 4129 list_add_tail_rcu(&nft_trans_set(trans)->list,
4130 &trans->ctx.table->sets);
958bee14
PNA		 4131 nft_trans_destroy(trans);
4132 break;
60319eb1 4133 case NFT_MSG_NEWSETELEM:
02263db0 4134 te = (struct nft_trans_elem *)trans->data;
fe2811eb 4135
02263db0 4136 te->set->ops->remove(te->set, &te->elem);
3dd0673a 4137 atomic_dec(&te->set->nelems);
60319eb1
PNA		 4138 break;
4139 case NFT_MSG_DELSETELEM:
cc02e457
PM		 4140 te = (struct nft_trans_elem *)trans->data;
4141
cc02e457 4142 te->set->ops->activate(te->set, &te->elem);
3dd0673a 4143 te->set->ndeact--;
cc02e457 4144
60319eb1
PNA		 4145 nft_trans_destroy(trans);
4146 break;
37082f93 4147 }
37082f93
PNA		 4148 }
4149
b326dd37
PNA		 4150 synchronize_rcu();
4151
a1cee076
PNA		 4152 list_for_each_entry_safe_reverse(trans, next,
4153 &net->nft.commit_list, list) {
c7c32e72 4154 list_del(&trans->list);
b326dd37 4155 nf_tables_abort_release(trans);
37082f93
PNA		 4156 }
4157
4158 return 0;
4159}
4160
96518518
PM		 4161static const struct nfnetlink_subsystem nf_tables_subsys = {
4162 .name = "nf_tables",
4163 .subsys_id = NFNL_SUBSYS_NFTABLES,
4164 .cb_count = NFT_MSG_MAX,
4165 .cb = nf_tables_cb,
0628b123
PNA		 4166 .commit = nf_tables_commit,
4167 .abort = nf_tables_abort,
96518518
PM		 4168};
4169
7210e4e3
PNA		 4170int nft_chain_validate_dependency(const struct nft_chain *chain,
4171 enum nft_chain_type type)
4172{
4173 const struct nft_base_chain *basechain;
4174
4175 if (chain->flags & NFT_BASE_CHAIN) {
4176 basechain = nft_base_chain(chain);
4177 if (basechain->type->type != type)
4178 return -EOPNOTSUPP;
4179 }
4180 return 0;
4181}
4182EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
4183
75e8d06d
PNA		 4184int nft_chain_validate_hooks(const struct nft_chain *chain,
4185 unsigned int hook_flags)
4186{
4187 struct nft_base_chain *basechain;
4188
4189 if (chain->flags & NFT_BASE_CHAIN) {
4190 basechain = nft_base_chain(chain);
4191
4192 if ((1 << basechain->ops[0].hooknum) & hook_flags)
4193 return 0;
4194
4195 return -EOPNOTSUPP;
4196 }
4197
4198 return 0;
4199}
4200EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
4201
20a69341
PM		 4202/*
4203 * Loop detection - walk through the ruleset beginning at the destination chain
4204 * of a new jump until either the source chain is reached (loop) or all
4205 * reachable chains have been traversed.
4206 *
4207 * The loop check is performed whenever a new jump verdict is added to an
4208 * expression or verdict map or a verdict map is bound to a new chain.
4209 */
4210
4211static int nf_tables_check_loops(const struct nft_ctx *ctx,
4212 const struct nft_chain *chain);
4213
4214static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
4215 const struct nft_set *set,
4216 const struct nft_set_iter *iter,
4217 const struct nft_set_elem *elem)
4218{
fe2811eb
PM		 4219 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4220 const struct nft_data *data;
4221
4222 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4223 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
62f9c8b4
PNA		 4224 return 0;
4225
fe2811eb 4226 data = nft_set_ext_data(ext);
1ca2e170 4227 switch (data->verdict.code) {
20a69341
PM		 4228 case NFT_JUMP:
4229 case NFT_GOTO:
1ca2e170 4230 return nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 4231 default:
4232 return 0;
4233 }
4234}
4235
4236static int nf_tables_check_loops(const struct nft_ctx *ctx,
4237 const struct nft_chain *chain)
4238{
4239 const struct nft_rule *rule;
4240 const struct nft_expr *expr, *last;
20a69341
PM		 4241 const struct nft_set *set;
4242 struct nft_set_binding *binding;
4243 struct nft_set_iter iter;
20a69341
PM		 4244
4245 if (ctx->chain == chain)
4246 return -ELOOP;
4247
4248 list_for_each_entry(rule, &chain->rules, list) {
4249 nft_rule_for_each_expr(expr, last, rule) {
0ca743a5
PNA		 4250 const struct nft_data *data = NULL;
4251 int err;
4252
4253 if (!expr->ops->validate)
20a69341
PM		 4254 continue;
4255
0ca743a5
PNA		 4256 err = expr->ops->validate(ctx, expr, &data);
4257 if (err < 0)
4258 return err;
4259
20a69341 4260 if (data == NULL)
0ca743a5 4261 continue;
20a69341 4262
1ca2e170 4263 switch (data->verdict.code) {
20a69341
PM		 4264 case NFT_JUMP:
4265 case NFT_GOTO:
1ca2e170
PM		 4266 err = nf_tables_check_loops(ctx,
4267 data->verdict.chain);
20a69341
PM		 4268 if (err < 0)
4269 return err;
4270 default:
4271 break;
4272 }
4273 }
4274 }
4275
4276 list_for_each_entry(set, &ctx->table->sets, list) {
4277 if (!(set->flags & NFT_SET_MAP) ||
4278 set->dtype != NFT_DATA_VERDICT)
4279 continue;
4280
4281 list_for_each_entry(binding, &set->bindings, list) {
11113e19
PM		 4282 if (!(binding->flags & NFT_SET_MAP) ||
4283 binding->chain != chain)
20a69341
PM		 4284 continue;
4285
8588ac09 4286 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 4287 iter.skip = 0;
4288 iter.count = 0;
4289 iter.err = 0;
4290 iter.fn = nf_tables_loop_check_setelem;
4291
4292 set->ops->walk(ctx, set, &iter);
4293 if (iter.err < 0)
4294 return iter.err;
4295 }
4296 }
4297
4298 return 0;
4299}
4300
49499c3e
PM		 4301/**
4302 * nft_parse_register - parse a register value from a netlink attribute
4303 *
4304 * @attr: netlink attribute
4305 *
4306 * Parse and translate a register value from a netlink attribute.
4307 * Registers used to be 128 bit wide, these register numbers will be
4308 * mapped to the corresponding 32 bit register numbers.
4309 */
b1c96ed3
PM		 4310unsigned int nft_parse_register(const struct nlattr *attr)
4311{
49499c3e
PM		 4312 unsigned int reg;
4313
4314 reg = ntohl(nla_get_be32(attr));
4315 switch (reg) {
4316 case NFT_REG_VERDICT...NFT_REG_4:
4317 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
4318 default:
4319 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
4320 }
b1c96ed3
PM		 4321}
4322EXPORT_SYMBOL_GPL(nft_parse_register);
4323
49499c3e
PM		 4324/**
4325 * nft_dump_register - dump a register value to a netlink attribute
4326 *
4327 * @skb: socket buffer
4328 * @attr: attribute number
4329 * @reg: register number
4330 *
4331 * Construct a netlink attribute containing the register number. For
4332 * compatibility reasons, register numbers being a multiple of 4 are
4333 * translated to the corresponding 128 bit register numbers.
4334 */
b1c96ed3
PM		 4335int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
4336{
49499c3e
PM		 4337 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
4338 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
4339 else
4340 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
4341
b1c96ed3
PM		 4342 return nla_put_be32(skb, attr, htonl(reg));
4343}
4344EXPORT_SYMBOL_GPL(nft_dump_register);
4345
96518518 4346/**
d07db988 4347 * nft_validate_register_load - validate a load from a register
96518518
PM		 4348 *
4349 * @reg: the register number
d07db988 4350 * @len: the length of the data
96518518
PM		 4351 *
4352 * Validate that the input register is one of the general purpose
d07db988 4353 * registers and that the length of the load is within the bounds.
96518518 4354 */
d07db988 4355int nft_validate_register_load(enum nft_registers reg, unsigned int len)
96518518 4356{
49499c3e 4357 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
96518518 4358 return -EINVAL;
d07db988
PM		 4359 if (len == 0)
4360 return -EINVAL;
49499c3e 4361 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
d07db988 4362 return -ERANGE;
49499c3e 4363
96518518
PM		 4364 return 0;
4365}
d07db988 4366EXPORT_SYMBOL_GPL(nft_validate_register_load);
96518518 4367
96518518 4368/**
1ec10212 4369 * nft_validate_register_store - validate an expressions' register store
96518518
PM		 4370 *
4371 * @ctx: context of the expression performing the load
4372 * @reg: the destination register number
4373 * @data: the data to load
4374 * @type: the data type
45d9bcda 4375 * @len: the length of the data
96518518
PM		 4376 *
4377 * Validate that a data load uses the appropriate data type for
45d9bcda
PM		 4378 * the destination register and the length is within the bounds.
4379 * A value of NULL for the data means that its runtime gathered
58f40ab6 4380 * data.
96518518 4381 */
1ec10212
PM		 4382int nft_validate_register_store(const struct nft_ctx *ctx,
4383 enum nft_registers reg,
4384 const struct nft_data *data,
4385 enum nft_data_types type, unsigned int len)
96518518 4386{
20a69341
PM		 4387 int err;
4388
96518518
PM		 4389 switch (reg) {
4390 case NFT_REG_VERDICT:
58f40ab6 4391 if (type != NFT_DATA_VERDICT)
96518518 4392 return -EINVAL;
20a69341 4393
58f40ab6 4394 if (data != NULL &&
1ca2e170
PM		 4395 (data->verdict.code == NFT_GOTO ||
4396 data->verdict.code == NFT_JUMP)) {
4397 err = nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 4398 if (err < 0)
4399 return err;
4400
1ca2e170
PM		 4401 if (ctx->chain->level + 1 >
4402 data->verdict.chain->level) {
20a69341
PM		 4403 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
4404 return -EMLINK;
1ca2e170 4405 data->verdict.chain->level = ctx->chain->level + 1;
20a69341
PM		 4406 }
4407 }
4408
96518518
PM		 4409 return 0;
4410 default:
49499c3e 4411 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
27e6d201 4412 return -EINVAL;
45d9bcda
PM		 4413 if (len == 0)
4414 return -EINVAL;
49499c3e
PM		 4415 if (reg * NFT_REG32_SIZE + len >
4416 FIELD_SIZEOF(struct nft_regs, data))
45d9bcda 4417 return -ERANGE;
27e6d201 4418
96518518
PM		 4419 if (data != NULL && type != NFT_DATA_VALUE)
4420 return -EINVAL;
4421 return 0;
4422 }
4423}
1ec10212 4424EXPORT_SYMBOL_GPL(nft_validate_register_store);
96518518
PM		 4425
4426static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
4427 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
4428 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
4429 .len = NFT_CHAIN_MAXNAMELEN - 1 },
4430};
4431
4432static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
4433 struct nft_data_desc *desc, const struct nlattr *nla)
4434{
4435 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
4436 struct nft_chain *chain;
4437 int err;
4438
4439 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
4440 if (err < 0)
4441 return err;
4442
4443 if (!tb[NFTA_VERDICT_CODE])
4444 return -EINVAL;
1ca2e170 4445 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
96518518 4446
1ca2e170 4447 switch (data->verdict.code) {
e0abdadc 4448 default:
1ca2e170 4449 switch (data->verdict.code & NF_VERDICT_MASK) {
e0abdadc
PM		 4450 case NF_ACCEPT:
4451 case NF_DROP:
4452 case NF_QUEUE:
4453 break;
4454 default:
4455 return -EINVAL;
4456 }
4457 /* fall through */
96518518
PM		 4458 case NFT_CONTINUE:
4459 case NFT_BREAK:
4460 case NFT_RETURN:
96518518
PM		 4461 break;
4462 case NFT_JUMP:
4463 case NFT_GOTO:
4464 if (!tb[NFTA_VERDICT_CHAIN])
4465 return -EINVAL;
4466 chain = nf_tables_chain_lookup(ctx->table,
4467 tb[NFTA_VERDICT_CHAIN]);
4468 if (IS_ERR(chain))
4469 return PTR_ERR(chain);
4470 if (chain->flags & NFT_BASE_CHAIN)
4471 return -EOPNOTSUPP;
4472
96518518 4473 chain->use++;
1ca2e170 4474 data->verdict.chain = chain;
96518518 4475 break;
96518518
PM		 4476 }
4477
4c4ed074 4478 desc->len = sizeof(data->verdict);
96518518
PM		 4479 desc->type = NFT_DATA_VERDICT;
4480 return 0;
4481}
4482
4483static void nft_verdict_uninit(const struct nft_data *data)
4484{
1ca2e170 4485 switch (data->verdict.code) {
96518518
PM		 4486 case NFT_JUMP:
4487 case NFT_GOTO:
1ca2e170 4488 data->verdict.chain->use--;
96518518
PM		 4489 break;
4490 }
4491}
4492
33d5a7b1 4493int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
96518518
PM		 4494{
4495 struct nlattr *nest;
4496
33d5a7b1 4497 nest = nla_nest_start(skb, type);
96518518
PM		 4498 if (!nest)
4499 goto nla_put_failure;
4500
33d5a7b1 4501 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
96518518
PM		 4502 goto nla_put_failure;
4503
33d5a7b1 4504 switch (v->code) {
96518518
PM		 4505 case NFT_JUMP:
4506 case NFT_GOTO:
1ca2e170 4507 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
33d5a7b1 4508 v->chain->name))
96518518
PM		 4509 goto nla_put_failure;
4510 }
4511 nla_nest_end(skb, nest);
4512 return 0;
4513
4514nla_put_failure:
4515 return -1;
4516}
4517
d0a11fc3
PM		 4518static int nft_value_init(const struct nft_ctx *ctx,
4519 struct nft_data *data, unsigned int size,
96518518
PM		 4520 struct nft_data_desc *desc, const struct nlattr *nla)
4521{
4522 unsigned int len;
4523
4524 len = nla_len(nla);
4525 if (len == 0)
4526 return -EINVAL;
d0a11fc3 4527 if (len > size)
96518518
PM		 4528 return -EOVERFLOW;
4529
d0a11fc3 4530 nla_memcpy(data->data, nla, len);
96518518
PM		 4531 desc->type = NFT_DATA_VALUE;
4532 desc->len = len;
4533 return 0;
4534}
4535
4536static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
4537 unsigned int len)
4538{
4539 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
4540}
4541
4542static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
d0a11fc3 4543 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
96518518
PM		 4544 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
4545};
4546
4547/**
4548 * nft_data_init - parse nf_tables data netlink attributes
4549 *
4550 * @ctx: context of the expression using the data
4551 * @data: destination struct nft_data
d0a11fc3 4552 * @size: maximum data length
96518518
PM		 4553 * @desc: data description
4554 * @nla: netlink attribute containing data
4555 *
4556 * Parse the netlink data attributes and initialize a struct nft_data.
4557 * The type and length of data are returned in the data description.
4558 *
4559 * The caller can indicate that it only wants to accept data of type
4560 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4561 */
d0a11fc3
PM		 4562int nft_data_init(const struct nft_ctx *ctx,
4563 struct nft_data *data, unsigned int size,
96518518
PM		 4564 struct nft_data_desc *desc, const struct nlattr *nla)
4565{
4566 struct nlattr *tb[NFTA_DATA_MAX + 1];
4567 int err;
4568
4569 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
4570 if (err < 0)
4571 return err;
4572
4573 if (tb[NFTA_DATA_VALUE])
d0a11fc3
PM		 4574 return nft_value_init(ctx, data, size, desc,
4575 tb[NFTA_DATA_VALUE]);
96518518
PM		 4576 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
4577 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
4578 return -EINVAL;
4579}
4580EXPORT_SYMBOL_GPL(nft_data_init);
4581
4582/**
4583 * nft_data_uninit - release a nft_data item
4584 *
4585 * @data: struct nft_data to release
4586 * @type: type of data
4587 *
4588 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4589 * all others need to be released by calling this function.
4590 */
4591void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
4592{
960bd2c2 4593 if (type < NFT_DATA_VERDICT)
96518518 4594 return;
960bd2c2 4595 switch (type) {
96518518
PM		 4596 case NFT_DATA_VERDICT:
4597 return nft_verdict_uninit(data);
4598 default:
4599 WARN_ON(1);
4600 }
4601}
4602EXPORT_SYMBOL_GPL(nft_data_uninit);
4603
4604int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4605 enum nft_data_types type, unsigned int len)
4606{
4607 struct nlattr *nest;
4608 int err;
4609
4610 nest = nla_nest_start(skb, attr);
4611 if (nest == NULL)
4612 return -1;
4613
4614 switch (type) {
4615 case NFT_DATA_VALUE:
4616 err = nft_value_dump(skb, data, len);
4617 break;
4618 case NFT_DATA_VERDICT:
33d5a7b1 4619 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
96518518
PM		 4620 break;
4621 default:
4622 err = -EINVAL;
4623 WARN_ON(1);
4624 }
4625
4626 nla_nest_end(skb, nest);
4627 return err;
4628}
4629EXPORT_SYMBOL_GPL(nft_data_dump);
4630
df05ef87 4631static int __net_init nf_tables_init_net(struct net *net)
99633ab2
PNA		 4632{
4633 INIT_LIST_HEAD(&net->nft.af_info);
0628b123 4634 INIT_LIST_HEAD(&net->nft.commit_list);
38e029f1 4635 net->nft.base_seq = 1;
99633ab2
PNA		 4636 return 0;
4637}
4638
5ebe0b0e
PNA		 4639int __nft_release_basechain(struct nft_ctx *ctx)
4640{
4641 struct nft_rule *rule, *nr;
4642
4643 BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
4644
4645 nf_tables_unregister_hooks(ctx->chain->table, ctx->chain,
4646 ctx->afi->nops);
4647 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
4648 list_del(&rule->list);
4649 ctx->chain->use--;
4650 nf_tables_rule_destroy(ctx, rule);
4651 }
4652 list_del(&ctx->chain->list);
4653 ctx->table->use--;
4654 nf_tables_chain_destroy(ctx->chain);
4655
4656 return 0;
4657}
4658EXPORT_SYMBOL_GPL(__nft_release_basechain);
4659
df05ef87
PNA		 4660/* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
4661static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
4662{
4663 struct nft_table *table, *nt;
4664 struct nft_chain *chain, *nc;
4665 struct nft_rule *rule, *nr;
4666 struct nft_set *set, *ns;
4667 struct nft_ctx ctx = {
4668 .net = net,
4669 .afi = afi,
4670 };
4671
4672 list_for_each_entry_safe(table, nt, &afi->tables, list) {
4673 list_for_each_entry(chain, &table->chains, list)
4674 nf_tables_unregister_hooks(table, chain, afi->nops);
4675 /* No packets are walking on these chains anymore. */
4676 ctx.table = table;
4677 list_for_each_entry(chain, &table->chains, list) {
4678 ctx.chain = chain;
4679 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
4680 list_del(&rule->list);
4681 chain->use--;
4682 nf_tables_rule_destroy(&ctx, rule);
4683 }
4684 }
4685 list_for_each_entry_safe(set, ns, &table->sets, list) {
4686 list_del(&set->list);
4687 table->use--;
4688 nft_set_destroy(set);
4689 }
4690 list_for_each_entry_safe(chain, nc, &table->chains, list) {
4691 list_del(&chain->list);
4692 table->use--;
4693 nf_tables_chain_destroy(chain);
4694 }
4695 list_del(&table->list);
4696 nf_tables_table_destroy(&ctx);
4697 }
4698}
4699
99633ab2
PNA		 4700static struct pernet_operations nf_tables_net_ops = {
4701 .init = nf_tables_init_net,
4702};
4703
96518518
PM		 4704static int __init nf_tables_module_init(void)
4705{
4706 int err;
4707
4708 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4709 GFP_KERNEL);
4710 if (info == NULL) {
4711 err = -ENOMEM;
4712 goto err1;
4713 }
4714
4715 err = nf_tables_core_module_init();
4716 if (err < 0)
4717 goto err2;
4718
4719 err = nfnetlink_subsys_register(&nf_tables_subsys);
4720 if (err < 0)
4721 goto err3;
4722
4723 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
99633ab2 4724 return register_pernet_subsys(&nf_tables_net_ops);
96518518
PM		 4725err3:
4726 nf_tables_core_module_exit();
4727err2:
4728 kfree(info);
4729err1:
4730 return err;
4731}
4732
4733static void __exit nf_tables_module_exit(void)
4734{
99633ab2 4735 unregister_pernet_subsys(&nf_tables_net_ops);
96518518 4736 nfnetlink_subsys_unregister(&nf_tables_subsys);
1b1bc49c 4737 rcu_barrier();
96518518
PM		 4738 nf_tables_core_module_exit();
4739 kfree(info);
4740}
4741
4742module_init(nf_tables_module_init);
4743module_exit(nf_tables_module_exit);
4744
4745MODULE_LICENSE("GPL");
4746MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4747MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
Linux 6.x block layer and io_uring tree(s)