]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blame - net/netfilter/nf_tables_api.c
projects / mirror_ubuntu-bionic-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge branch 'mlx4-fixes'
[mirror_ubuntu-bionic-kernel.git] / net / netfilter / nf_tables_api.c
CommitLineData
96518518 1/*
20a69341 2 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
96518518
PM		 3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
9 */
10
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/list.h>
14#include <linux/skbuff.h>
15#include <linux/netlink.h>
16#include <linux/netfilter.h>
17#include <linux/netfilter/nfnetlink.h>
18#include <linux/netfilter/nf_tables.h>
19#include <net/netfilter/nf_tables_core.h>
20#include <net/netfilter/nf_tables.h>
99633ab2 21#include <net/net_namespace.h>
96518518
PM		 22#include <net/sock.h>
23
96518518
PM		 24static LIST_HEAD(nf_tables_expressions);
25
26/**
27 * nft_register_afinfo - register nf_tables address family info
28 *
29 * @afi: address family info to register
30 *
31 * Register the address family for use with nf_tables. Returns zero on
32 * success or a negative errno code otherwise.
33 */
99633ab2 34int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
96518518
PM		 35{
36 INIT_LIST_HEAD(&afi->tables);
37 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 38 list_add_tail_rcu(&afi->list, &net->nft.af_info);
96518518
PM		 39 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
40 return 0;
41}
42EXPORT_SYMBOL_GPL(nft_register_afinfo);
43
df05ef87
PNA		 44static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi);
45
96518518
PM		 46/**
47 * nft_unregister_afinfo - unregister nf_tables address family info
48 *
49 * @afi: address family info to unregister
50 *
51 * Unregister the address family for use with nf_tables.
52 */
df05ef87 53void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi)
96518518
PM		 54{
55 nfnl_lock(NFNL_SUBSYS_NFTABLES);
df05ef87 56 __nft_release_afinfo(net, afi);
e688a7f8 57 list_del_rcu(&afi->list);
96518518
PM		 58 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
59}
60EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
61
99633ab2 62static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
96518518
PM		 63{
64 struct nft_af_info *afi;
65
99633ab2 66 list_for_each_entry(afi, &net->nft.af_info, list) {
96518518
PM		 67 if (afi->family == family)
68 return afi;
69 }
70 return NULL;
71}
72
99633ab2
PNA		 73static struct nft_af_info *
74nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
96518518
PM		 75{
76 struct nft_af_info *afi;
77
99633ab2 78 afi = nft_afinfo_lookup(net, family);
96518518
PM		 79 if (afi != NULL)
80 return afi;
81#ifdef CONFIG_MODULES
82 if (autoload) {
83 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
84 request_module("nft-afinfo-%u", family);
85 nfnl_lock(NFNL_SUBSYS_NFTABLES);
99633ab2 86 afi = nft_afinfo_lookup(net, family);
96518518
PM		 87 if (afi != NULL)
88 return ERR_PTR(-EAGAIN);
89 }
90#endif
91 return ERR_PTR(-EAFNOSUPPORT);
92}
93
7c95f6d8 94static void nft_ctx_init(struct nft_ctx *ctx,
633c9a84 95 struct net *net,
7c95f6d8
PNA		 96 const struct sk_buff *skb,
97 const struct nlmsghdr *nlh,
98 struct nft_af_info *afi,
99 struct nft_table *table,
100 struct nft_chain *chain,
101 const struct nlattr * const *nla)
102{
633c9a84 103 ctx->net = net;
128ad332
PNA		 104 ctx->afi = afi;
105 ctx->table = table;
106 ctx->chain = chain;
107 ctx->nla = nla;
108 ctx->portid = NETLINK_CB(skb).portid;
109 ctx->report = nlmsg_report(nlh);
110 ctx->seq = nlh->nlmsg_seq;
7c95f6d8
PNA		 111}
112
b380e5c7
PNA		 113static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type,
114 u32 size)
1081d11b
PNA		 115{
116 struct nft_trans *trans;
117
118 trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL);
119 if (trans == NULL)
120 return NULL;
121
b380e5c7 122 trans->msg_type = msg_type;
1081d11b
PNA		 123 trans->ctx = *ctx;
124
125 return trans;
126}
127
128static void nft_trans_destroy(struct nft_trans *trans)
129{
130 list_del(&trans->list);
131 kfree(trans);
132}
133
5ebe0b0e
PNA		 134static int nft_register_basechain(struct nft_base_chain *basechain,
135 unsigned int hook_nops)
d8ee8f7c 136{
fd2ecda0
EB		 137 struct net *net = read_pnet(&basechain->pnet);
138
835b8033
PNA		 139 if (basechain->flags & NFT_BASECHAIN_DISABLED)
140 return 0;
141
fd2ecda0 142 return nf_register_net_hooks(net, basechain->ops, hook_nops);
d8ee8f7c
PNA		 143}
144
5ebe0b0e
PNA		 145static void nft_unregister_basechain(struct nft_base_chain *basechain,
146 unsigned int hook_nops)
d8ee8f7c 147{
fd2ecda0
EB		 148 struct net *net = read_pnet(&basechain->pnet);
149
835b8033
PNA		 150 if (basechain->flags & NFT_BASECHAIN_DISABLED)
151 return;
152
fd2ecda0 153 nf_unregister_net_hooks(net, basechain->ops, hook_nops);
d8ee8f7c
PNA		 154}
155
156static int nf_tables_register_hooks(const struct nft_table *table,
157 struct nft_chain *chain,
158 unsigned int hook_nops)
159{
160 if (table->flags & NFT_TABLE_F_DORMANT ||
161 !(chain->flags & NFT_BASE_CHAIN))
162 return 0;
163
164 return nft_register_basechain(nft_base_chain(chain), hook_nops);
165}
166
c5598794 167static void nf_tables_unregister_hooks(const struct nft_table *table,
d8ee8f7c 168 struct nft_chain *chain,
c5598794
AB		 169 unsigned int hook_nops)
170{
d8ee8f7c
PNA		 171 if (table->flags & NFT_TABLE_F_DORMANT ||
172 !(chain->flags & NFT_BASE_CHAIN))
173 return;
174
175 nft_unregister_basechain(nft_base_chain(chain), hook_nops);
c5598794
AB		 176}
177
ee01d542
AB		 178/* Internal table flags */
179#define NFT_TABLE_INACTIVE (1 << 15)
180
181static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
182{
183 struct nft_trans *trans;
184
185 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
186 if (trans == NULL)
187 return -ENOMEM;
188
189 if (msg_type == NFT_MSG_NEWTABLE)
190 ctx->table->flags |= NFT_TABLE_INACTIVE;
191
192 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
193 return 0;
194}
195
196static int nft_deltable(struct nft_ctx *ctx)
197{
198 int err;
199
200 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
201 if (err < 0)
202 return err;
203
204 list_del_rcu(&ctx->table->list);
205 return err;
206}
207
208static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
209{
210 struct nft_trans *trans;
211
212 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
213 if (trans == NULL)
214 return -ENOMEM;
215
216 if (msg_type == NFT_MSG_NEWCHAIN)
217 ctx->chain->flags |= NFT_CHAIN_INACTIVE;
218
219 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
220 return 0;
221}
222
223static int nft_delchain(struct nft_ctx *ctx)
224{
225 int err;
226
227 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
228 if (err < 0)
229 return err;
230
231 ctx->table->use--;
232 list_del_rcu(&ctx->chain->list);
233
234 return err;
235}
236
237static inline bool
238nft_rule_is_active(struct net *net, const struct nft_rule *rule)
239{
ea4bd995 240 return (rule->genmask & nft_genmask_cur(net)) == 0;
ee01d542
AB		 241}
242
243static inline int
244nft_rule_is_active_next(struct net *net, const struct nft_rule *rule)
245{
ea4bd995 246 return (rule->genmask & nft_genmask_next(net)) == 0;
ee01d542
AB		 247}
248
249static inline void
250nft_rule_activate_next(struct net *net, struct nft_rule *rule)
251{
252 /* Now inactive, will be active in the future */
ea4bd995 253 rule->genmask = nft_genmask_cur(net);
ee01d542
AB		 254}
255
256static inline void
257nft_rule_deactivate_next(struct net *net, struct nft_rule *rule)
258{
ea4bd995 259 rule->genmask = nft_genmask_next(net);
ee01d542
AB		 260}
261
262static inline void nft_rule_clear(struct net *net, struct nft_rule *rule)
263{
ea4bd995 264 rule->genmask &= ~nft_genmask_next(net);
ee01d542
AB		 265}
266
267static int
268nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
269{
270 /* You cannot delete the same rule twice */
271 if (nft_rule_is_active_next(ctx->net, rule)) {
272 nft_rule_deactivate_next(ctx->net, rule);
273 ctx->chain->use--;
274 return 0;
275 }
276 return -ENOENT;
277}
278
279static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
280 struct nft_rule *rule)
281{
282 struct nft_trans *trans;
283
284 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
285 if (trans == NULL)
286 return NULL;
287
288 nft_trans_rule(trans) = rule;
289 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
290
291 return trans;
292}
293
294static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
295{
296 struct nft_trans *trans;
297 int err;
298
299 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
300 if (trans == NULL)
301 return -ENOMEM;
302
303 err = nf_tables_delrule_deactivate(ctx, rule);
304 if (err < 0) {
305 nft_trans_destroy(trans);
306 return err;
307 }
308
309 return 0;
310}
311
312static int nft_delrule_by_chain(struct nft_ctx *ctx)
313{
314 struct nft_rule *rule;
315 int err;
316
317 list_for_each_entry(rule, &ctx->chain->rules, list) {
318 err = nft_delrule(ctx, rule);
319 if (err < 0)
320 return err;
321 }
322 return 0;
323}
324
325/* Internal set flag */
326#define NFT_SET_INACTIVE (1 << 15)
327
328static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
329 struct nft_set *set)
330{
331 struct nft_trans *trans;
332
333 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
334 if (trans == NULL)
335 return -ENOMEM;
336
337 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
338 nft_trans_set_id(trans) =
339 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
340 set->flags |= NFT_SET_INACTIVE;
341 }
342 nft_trans_set(trans) = set;
343 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
344
345 return 0;
346}
347
348static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
349{
350 int err;
351
352 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
353 if (err < 0)
354 return err;
355
356 list_del_rcu(&set->list);
357 ctx->table->use--;
358
359 return err;
360}
361
96518518
PM		 362/*
363 * Tables
364 */
365
366static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
367 const struct nlattr *nla)
368{
369 struct nft_table *table;
370
371 list_for_each_entry(table, &afi->tables, list) {
372 if (!nla_strcmp(nla, table->name))
373 return table;
374 }
375 return NULL;
376}
377
378static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
9370761c 379 const struct nlattr *nla)
96518518
PM		 380{
381 struct nft_table *table;
382
383 if (nla == NULL)
384 return ERR_PTR(-EINVAL);
385
386 table = nft_table_lookup(afi, nla);
387 if (table != NULL)
388 return table;
389
96518518
PM		 390 return ERR_PTR(-ENOENT);
391}
392
393static inline u64 nf_tables_alloc_handle(struct nft_table *table)
394{
395 return ++table->hgenerator;
396}
397
2a37d755 398static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
9370761c 399
2a37d755 400static const struct nf_chain_type *
baae3e62 401__nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
9370761c
PNA		 402{
403 int i;
404
baae3e62 405 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
9370761c
PNA		 406 if (chain_type[family][i] != NULL &&
407 !nla_strcmp(nla, chain_type[family][i]->name))
baae3e62 408 return chain_type[family][i];
9370761c 409 }
baae3e62 410 return NULL;
9370761c
PNA		 411}
412
2a37d755 413static const struct nf_chain_type *
baae3e62
PM		 414nf_tables_chain_type_lookup(const struct nft_af_info *afi,
415 const struct nlattr *nla,
416 bool autoload)
9370761c 417{
2a37d755 418 const struct nf_chain_type *type;
9370761c
PNA		 419
420 type = __nf_tables_chain_type_lookup(afi->family, nla);
93b0806f
PM		 421 if (type != NULL)
422 return type;
9370761c 423#ifdef CONFIG_MODULES
93b0806f 424 if (autoload) {
9370761c 425 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2fec6bb6
PNA		 426 request_module("nft-chain-%u-%.*s", afi->family,
427 nla_len(nla), (const char *)nla_data(nla));
9370761c
PNA		 428 nfnl_lock(NFNL_SUBSYS_NFTABLES);
429 type = __nf_tables_chain_type_lookup(afi->family, nla);
93b0806f
PM		 430 if (type != NULL)
431 return ERR_PTR(-EAGAIN);
9370761c
PNA		 432 }
433#endif
93b0806f 434 return ERR_PTR(-ENOENT);
9370761c
PNA		 435}
436
96518518 437static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
1cae565e
PNA		 438 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
439 .len = NFT_TABLE_MAXNAMELEN - 1 },
9ddf6323 440 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
96518518
PM		 441};
442
84d7fce6
PNA		 443static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
444 u32 portid, u32 seq, int event, u32 flags,
445 int family, const struct nft_table *table)
96518518
PM		 446{
447 struct nlmsghdr *nlh;
448 struct nfgenmsg *nfmsg;
449
450 event |= NFNL_SUBSYS_NFTABLES << 8;
451 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
452 if (nlh == NULL)
453 goto nla_put_failure;
454
455 nfmsg = nlmsg_data(nlh);
456 nfmsg->nfgen_family = family;
457 nfmsg->version = NFNETLINK_V0;
84d7fce6 458 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518 459
9ddf6323 460 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
d8bcc768
TB		 461 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
462 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
96518518
PM		 463 goto nla_put_failure;
464
053c095a
JB		 465 nlmsg_end(skb, nlh);
466 return 0;
96518518
PM		 467
468nla_put_failure:
469 nlmsg_trim(skb, nlh);
470 return -1;
471}
472
35151d84 473static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 474{
475 struct sk_buff *skb;
96518518
PM		 476 int err;
477
128ad332
PNA		 478 if (!ctx->report &&
479 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
96518518
PM		 480 return 0;
481
482 err = -ENOBUFS;
483 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
484 if (skb == NULL)
485 goto err;
486
84d7fce6
PNA		 487 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
488 event, 0, ctx->afi->family, ctx->table);
96518518
PM		 489 if (err < 0) {
490 kfree_skb(skb);
491 goto err;
492 }
493
128ad332
PNA		 494 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
495 ctx->report, GFP_KERNEL);
96518518 496err:
128ad332
PNA		 497 if (err < 0) {
498 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
499 err);
500 }
96518518
PM		 501 return err;
502}
503
504static int nf_tables_dump_tables(struct sk_buff *skb,
505 struct netlink_callback *cb)
506{
507 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
508 const struct nft_af_info *afi;
509 const struct nft_table *table;
510 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 511 struct net *net = sock_net(skb->sk);
96518518
PM		 512 int family = nfmsg->nfgen_family;
513
e688a7f8 514 rcu_read_lock();
38e029f1
PNA		 515 cb->seq = net->nft.base_seq;
516
e688a7f8 517 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 518 if (family != NFPROTO_UNSPEC && family != afi->family)
519 continue;
520
e688a7f8 521 list_for_each_entry_rcu(table, &afi->tables, list) {
96518518
PM		 522 if (idx < s_idx)
523 goto cont;
524 if (idx > s_idx)
525 memset(&cb->args[1], 0,
526 sizeof(cb->args) - sizeof(cb->args[0]));
84d7fce6 527 if (nf_tables_fill_table_info(skb, net,
96518518
PM		 528 NETLINK_CB(cb->skb).portid,
529 cb->nlh->nlmsg_seq,
530 NFT_MSG_NEWTABLE,
531 NLM_F_MULTI,
532 afi->family, table) < 0)
533 goto done;
38e029f1
PNA		 534
535 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 536cont:
537 idx++;
538 }
539 }
540done:
e688a7f8 541 rcu_read_unlock();
96518518
PM		 542 cb->args[0] = idx;
543 return skb->len;
544}
545
7b8002a1
PNA		 546static int nf_tables_gettable(struct net *net, struct sock *nlsk,
547 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 548 const struct nlattr * const nla[])
549{
550 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
551 const struct nft_af_info *afi;
552 const struct nft_table *table;
553 struct sk_buff *skb2;
554 int family = nfmsg->nfgen_family;
555 int err;
556
557 if (nlh->nlmsg_flags & NLM_F_DUMP) {
558 struct netlink_dump_control c = {
559 .dump = nf_tables_dump_tables,
560 };
561 return netlink_dump_start(nlsk, skb, nlh, &c);
562 }
563
99633ab2 564 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 565 if (IS_ERR(afi))
566 return PTR_ERR(afi);
567
9370761c 568 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
96518518
PM		 569 if (IS_ERR(table))
570 return PTR_ERR(table);
55dd6f93
PNA		 571 if (table->flags & NFT_TABLE_INACTIVE)
572 return -ENOENT;
96518518
PM		 573
574 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
575 if (!skb2)
576 return -ENOMEM;
577
84d7fce6 578 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 579 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
580 family, table);
581 if (err < 0)
582 goto err;
583
584 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
585
586err:
587 kfree_skb(skb2);
588 return err;
589}
590
115a60b1
PM		 591static int nf_tables_table_enable(const struct nft_af_info *afi,
592 struct nft_table *table)
9ddf6323
PNA		 593{
594 struct nft_chain *chain;
595 int err, i = 0;
596
597 list_for_each_entry(chain, &table->chains, list) {
d2012975
PNA		 598 if (!(chain->flags & NFT_BASE_CHAIN))
599 continue;
600
d8ee8f7c 601 err = nft_register_basechain(nft_base_chain(chain), afi->nops);
9ddf6323
PNA		 602 if (err < 0)
603 goto err;
604
605 i++;
606 }
607 return 0;
608err:
609 list_for_each_entry(chain, &table->chains, list) {
d2012975
PNA		 610 if (!(chain->flags & NFT_BASE_CHAIN))
611 continue;
612
9ddf6323
PNA		 613 if (i-- <= 0)
614 break;
615
d8ee8f7c 616 nft_unregister_basechain(nft_base_chain(chain), afi->nops);
9ddf6323
PNA		 617 }
618 return err;
619}
620
f75edf5e 621static void nf_tables_table_disable(const struct nft_af_info *afi,
d8ee8f7c 622 struct nft_table *table)
9ddf6323
PNA		 623{
624 struct nft_chain *chain;
625
d2012975
PNA		 626 list_for_each_entry(chain, &table->chains, list) {
627 if (chain->flags & NFT_BASE_CHAIN)
d8ee8f7c
PNA		 628 nft_unregister_basechain(nft_base_chain(chain),
629 afi->nops);
d2012975 630 }
9ddf6323
PNA		 631}
632
e1aaca93 633static int nf_tables_updtable(struct nft_ctx *ctx)
9ddf6323 634{
55dd6f93 635 struct nft_trans *trans;
e1aaca93 636 u32 flags;
55dd6f93 637 int ret = 0;
9ddf6323 638
e1aaca93
PNA		 639 if (!ctx->nla[NFTA_TABLE_FLAGS])
640 return 0;
9ddf6323 641
e1aaca93
PNA		 642 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
643 if (flags & ~NFT_TABLE_F_DORMANT)
644 return -EINVAL;
645
63283dd2
PNA		 646 if (flags == ctx->table->flags)
647 return 0;
648
55dd6f93
PNA		 649 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
650 sizeof(struct nft_trans_table));
651 if (trans == NULL)
652 return -ENOMEM;
9ddf6323 653
e1aaca93
PNA		 654 if ((flags & NFT_TABLE_F_DORMANT) &&
655 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
55dd6f93 656 nft_trans_table_enable(trans) = false;
e1aaca93
PNA		 657 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
658 ctx->table->flags & NFT_TABLE_F_DORMANT) {
659 ret = nf_tables_table_enable(ctx->afi, ctx->table);
55dd6f93 660 if (ret >= 0) {
e1aaca93 661 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
55dd6f93 662 nft_trans_table_enable(trans) = true;
9ddf6323 663 }
9ddf6323 664 }
e1aaca93
PNA		 665 if (ret < 0)
666 goto err;
9ddf6323 667
55dd6f93
PNA		 668 nft_trans_table_update(trans) = true;
669 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
670 return 0;
9ddf6323 671err:
55dd6f93 672 nft_trans_destroy(trans);
9ddf6323
PNA		 673 return ret;
674}
675
633c9a84
PNA		 676static int nf_tables_newtable(struct net *net, struct sock *nlsk,
677 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 678 const struct nlattr * const nla[])
679{
680 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
681 const struct nlattr *name;
682 struct nft_af_info *afi;
683 struct nft_table *table;
684 int family = nfmsg->nfgen_family;
c5c1f975 685 u32 flags = 0;
e1aaca93 686 struct nft_ctx ctx;
55dd6f93 687 int err;
96518518 688
99633ab2 689 afi = nf_tables_afinfo_lookup(net, family, true);
96518518
PM		 690 if (IS_ERR(afi))
691 return PTR_ERR(afi);
692
693 name = nla[NFTA_TABLE_NAME];
9370761c 694 table = nf_tables_table_lookup(afi, name);
96518518
PM		 695 if (IS_ERR(table)) {
696 if (PTR_ERR(table) != -ENOENT)
697 return PTR_ERR(table);
698 table = NULL;
699 }
700
701 if (table != NULL) {
55dd6f93
PNA		 702 if (table->flags & NFT_TABLE_INACTIVE)
703 return -ENOENT;
96518518
PM		 704 if (nlh->nlmsg_flags & NLM_F_EXCL)
705 return -EEXIST;
706 if (nlh->nlmsg_flags & NLM_F_REPLACE)
707 return -EOPNOTSUPP;
e1aaca93 708
633c9a84 709 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
e1aaca93 710 return nf_tables_updtable(&ctx);
96518518
PM		 711 }
712
c5c1f975
PM		 713 if (nla[NFTA_TABLE_FLAGS]) {
714 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
715 if (flags & ~NFT_TABLE_F_DORMANT)
716 return -EINVAL;
717 }
718
ebddf1a8 719 err = -EAFNOSUPPORT;
7047f9d0 720 if (!try_module_get(afi->owner))
ebddf1a8 721 goto err1;
7047f9d0 722
ffdb210e 723 err = -ENOMEM;
1cae565e 724 table = kzalloc(sizeof(*table), GFP_KERNEL);
ffdb210e 725 if (table == NULL)
ebddf1a8 726 goto err2;
96518518 727
1cae565e 728 nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
96518518 729 INIT_LIST_HEAD(&table->chains);
20a69341 730 INIT_LIST_HEAD(&table->sets);
c5c1f975 731 table->flags = flags;
9ddf6323 732
633c9a84 733 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
55dd6f93 734 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
ffdb210e 735 if (err < 0)
ebddf1a8 736 goto err3;
ffdb210e 737
e688a7f8 738 list_add_tail_rcu(&table->list, &afi->tables);
96518518 739 return 0;
ebddf1a8 740err3:
ffdb210e 741 kfree(table);
ebddf1a8 742err2:
ffdb210e 743 module_put(afi->owner);
ebddf1a8 744err1:
ffdb210e 745 return err;
96518518
PM		 746}
747
b9ac12ef
AB		 748static int nft_flush_table(struct nft_ctx *ctx)
749{
750 int err;
751 struct nft_chain *chain, *nc;
752 struct nft_set *set, *ns;
753
a2f18db0 754 list_for_each_entry(chain, &ctx->table->chains, list) {
b9ac12ef
AB		 755 ctx->chain = chain;
756
757 err = nft_delrule_by_chain(ctx);
758 if (err < 0)
759 goto out;
b9ac12ef
AB		 760 }
761
762 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
763 if (set->flags & NFT_SET_ANONYMOUS &&
764 !list_empty(&set->bindings))
765 continue;
766
767 err = nft_delset(ctx, set);
768 if (err < 0)
769 goto out;
770 }
771
a2f18db0
PNA		 772 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
773 ctx->chain = chain;
774
775 err = nft_delchain(ctx);
776 if (err < 0)
777 goto out;
778 }
779
b9ac12ef
AB		 780 err = nft_deltable(ctx);
781out:
782 return err;
783}
784
785static int nft_flush(struct nft_ctx *ctx, int family)
786{
787 struct nft_af_info *afi;
788 struct nft_table *table, *nt;
789 const struct nlattr * const *nla = ctx->nla;
790 int err = 0;
791
792 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
793 if (family != AF_UNSPEC && afi->family != family)
794 continue;
795
796 ctx->afi = afi;
797 list_for_each_entry_safe(table, nt, &afi->tables, list) {
798 if (nla[NFTA_TABLE_NAME] &&
799 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
800 continue;
801
802 ctx->table = table;
803
804 err = nft_flush_table(ctx);
805 if (err < 0)
806 goto out;
807 }
808 }
809out:
810 return err;
811}
812
633c9a84
PNA		 813static int nf_tables_deltable(struct net *net, struct sock *nlsk,
814 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 815 const struct nlattr * const nla[])
816{
817 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
818 struct nft_af_info *afi;
819 struct nft_table *table;
ee01d542 820 int family = nfmsg->nfgen_family;
55dd6f93 821 struct nft_ctx ctx;
96518518 822
633c9a84 823 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
b9ac12ef
AB		 824 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
825 return nft_flush(&ctx, family);
826
99633ab2 827 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 828 if (IS_ERR(afi))
829 return PTR_ERR(afi);
830
9370761c 831 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
96518518
PM		 832 if (IS_ERR(table))
833 return PTR_ERR(table);
96518518 834
b9ac12ef
AB		 835 ctx.afi = afi;
836 ctx.table = table;
55dd6f93 837
b9ac12ef 838 return nft_flush_table(&ctx);
96518518
PM		 839}
840
55dd6f93
PNA		 841static void nf_tables_table_destroy(struct nft_ctx *ctx)
842{
4fefee57
PNA		 843 BUG_ON(ctx->table->use > 0);
844
55dd6f93
PNA		 845 kfree(ctx->table);
846 module_put(ctx->afi->owner);
847}
848
2a37d755 849int nft_register_chain_type(const struct nf_chain_type *ctype)
96518518 850{
9370761c 851 int err = 0;
96518518
PM		 852
853 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c
PNA		 854 if (chain_type[ctype->family][ctype->type] != NULL) {
855 err = -EBUSY;
856 goto out;
96518518 857 }
9370761c
PNA		 858 chain_type[ctype->family][ctype->type] = ctype;
859out:
96518518
PM		 860 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
861 return err;
862}
9370761c 863EXPORT_SYMBOL_GPL(nft_register_chain_type);
96518518 864
2a37d755 865void nft_unregister_chain_type(const struct nf_chain_type *ctype)
96518518 866{
96518518 867 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c 868 chain_type[ctype->family][ctype->type] = NULL;
96518518
PM		 869 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
870}
9370761c 871EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
96518518
PM		 872
873/*
874 * Chains
875 */
876
877static struct nft_chain *
878nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
879{
880 struct nft_chain *chain;
881
882 list_for_each_entry(chain, &table->chains, list) {
883 if (chain->handle == handle)
884 return chain;
885 }
886
887 return ERR_PTR(-ENOENT);
888}
889
890static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
891 const struct nlattr *nla)
892{
893 struct nft_chain *chain;
894
895 if (nla == NULL)
896 return ERR_PTR(-EINVAL);
897
898 list_for_each_entry(chain, &table->chains, list) {
899 if (!nla_strcmp(nla, chain->name))
900 return chain;
901 }
902
903 return ERR_PTR(-ENOENT);
904}
905
906static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
907 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
908 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
909 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
910 .len = NFT_CHAIN_MAXNAMELEN - 1 },
911 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
0ca743a5 912 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
4c1f7818 913 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
0ca743a5 914 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
96518518
PM		 915};
916
917static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
918 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
919 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
2cbce139
PNA		 920 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
921 .len = IFNAMSIZ - 1 },
96518518
PM		 922};
923
0ca743a5
PNA		 924static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
925{
926 struct nft_stats *cpu_stats, total;
927 struct nlattr *nest;
ce355e20
ED		 928 unsigned int seq;
929 u64 pkts, bytes;
0ca743a5
PNA		 930 int cpu;
931
932 memset(&total, 0, sizeof(total));
933 for_each_possible_cpu(cpu) {
934 cpu_stats = per_cpu_ptr(stats, cpu);
ce355e20
ED		 935 do {
936 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
937 pkts = cpu_stats->pkts;
938 bytes = cpu_stats->bytes;
939 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
940 total.pkts += pkts;
941 total.bytes += bytes;
0ca743a5
PNA		 942 }
943 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
944 if (nest == NULL)
945 goto nla_put_failure;
946
b46f6ded
ND		 947 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
948 NFTA_COUNTER_PAD) ||
949 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
950 NFTA_COUNTER_PAD))
0ca743a5
PNA		 951 goto nla_put_failure;
952
953 nla_nest_end(skb, nest);
954 return 0;
955
956nla_put_failure:
957 return -ENOSPC;
958}
959
84d7fce6
PNA		 960static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
961 u32 portid, u32 seq, int event, u32 flags,
962 int family, const struct nft_table *table,
96518518
PM		 963 const struct nft_chain *chain)
964{
965 struct nlmsghdr *nlh;
966 struct nfgenmsg *nfmsg;
967
968 event |= NFNL_SUBSYS_NFTABLES << 8;
969 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
970 if (nlh == NULL)
971 goto nla_put_failure;
972
973 nfmsg = nlmsg_data(nlh);
974 nfmsg->nfgen_family = family;
975 nfmsg->version = NFNETLINK_V0;
84d7fce6 976 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 977
978 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
979 goto nla_put_failure;
b46f6ded
ND		 980 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
981 NFTA_CHAIN_PAD))
96518518
PM		 982 goto nla_put_failure;
983 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
984 goto nla_put_failure;
985
986 if (chain->flags & NFT_BASE_CHAIN) {
0ca743a5 987 const struct nft_base_chain *basechain = nft_base_chain(chain);
115a60b1 988 const struct nf_hook_ops *ops = &basechain->ops[0];
0ca743a5
PNA		 989 struct nlattr *nest;
990
991 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
96518518
PM		 992 if (nest == NULL)
993 goto nla_put_failure;
994 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
995 goto nla_put_failure;
996 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
997 goto nla_put_failure;
2cbce139
PNA		 998 if (basechain->dev_name[0] &&
999 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1000 goto nla_put_failure;
96518518 1001 nla_nest_end(skb, nest);
9370761c 1002
0ca743a5
PNA		 1003 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1004 htonl(basechain->policy)))
1005 goto nla_put_failure;
1006
baae3e62
PM		 1007 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1008 goto nla_put_failure;
0ca743a5
PNA		 1009
1010 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
1011 goto nla_put_failure;
96518518
PM		 1012 }
1013
0ca743a5
PNA		 1014 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1015 goto nla_put_failure;
1016
053c095a
JB		 1017 nlmsg_end(skb, nlh);
1018 return 0;
96518518
PM		 1019
1020nla_put_failure:
1021 nlmsg_trim(skb, nlh);
1022 return -1;
1023}
1024
35151d84 1025static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 1026{
1027 struct sk_buff *skb;
96518518
PM		 1028 int err;
1029
128ad332
PNA		 1030 if (!ctx->report &&
1031 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
96518518
PM		 1032 return 0;
1033
1034 err = -ENOBUFS;
1035 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1036 if (skb == NULL)
1037 goto err;
1038
84d7fce6
PNA		 1039 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1040 event, 0, ctx->afi->family, ctx->table,
35151d84 1041 ctx->chain);
96518518
PM		 1042 if (err < 0) {
1043 kfree_skb(skb);
1044 goto err;
1045 }
1046
128ad332
PNA		 1047 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1048 ctx->report, GFP_KERNEL);
96518518 1049err:
128ad332
PNA		 1050 if (err < 0) {
1051 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1052 err);
1053 }
96518518
PM		 1054 return err;
1055}
1056
1057static int nf_tables_dump_chains(struct sk_buff *skb,
1058 struct netlink_callback *cb)
1059{
1060 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1061 const struct nft_af_info *afi;
1062 const struct nft_table *table;
1063 const struct nft_chain *chain;
1064 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1065 struct net *net = sock_net(skb->sk);
96518518
PM		 1066 int family = nfmsg->nfgen_family;
1067
e688a7f8 1068 rcu_read_lock();
38e029f1
PNA		 1069 cb->seq = net->nft.base_seq;
1070
e688a7f8 1071 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 1072 if (family != NFPROTO_UNSPEC && family != afi->family)
1073 continue;
1074
e688a7f8
PNA		 1075 list_for_each_entry_rcu(table, &afi->tables, list) {
1076 list_for_each_entry_rcu(chain, &table->chains, list) {
96518518
PM		 1077 if (idx < s_idx)
1078 goto cont;
1079 if (idx > s_idx)
1080 memset(&cb->args[1], 0,
1081 sizeof(cb->args) - sizeof(cb->args[0]));
84d7fce6
PNA		 1082 if (nf_tables_fill_chain_info(skb, net,
1083 NETLINK_CB(cb->skb).portid,
96518518
PM		 1084 cb->nlh->nlmsg_seq,
1085 NFT_MSG_NEWCHAIN,
1086 NLM_F_MULTI,
1087 afi->family, table, chain) < 0)
1088 goto done;
38e029f1
PNA		 1089
1090 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 1091cont:
1092 idx++;
1093 }
1094 }
1095 }
1096done:
e688a7f8 1097 rcu_read_unlock();
96518518
PM		 1098 cb->args[0] = idx;
1099 return skb->len;
1100}
1101
7b8002a1
PNA		 1102static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1103 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 1104 const struct nlattr * const nla[])
1105{
1106 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1107 const struct nft_af_info *afi;
1108 const struct nft_table *table;
1109 const struct nft_chain *chain;
1110 struct sk_buff *skb2;
1111 int family = nfmsg->nfgen_family;
1112 int err;
1113
1114 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1115 struct netlink_dump_control c = {
1116 .dump = nf_tables_dump_chains,
1117 };
1118 return netlink_dump_start(nlsk, skb, nlh, &c);
1119 }
1120
99633ab2 1121 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1122 if (IS_ERR(afi))
1123 return PTR_ERR(afi);
1124
9370761c 1125 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
96518518
PM		 1126 if (IS_ERR(table))
1127 return PTR_ERR(table);
55dd6f93
PNA		 1128 if (table->flags & NFT_TABLE_INACTIVE)
1129 return -ENOENT;
96518518
PM		 1130
1131 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1132 if (IS_ERR(chain))
1133 return PTR_ERR(chain);
91c7b38d
PNA		 1134 if (chain->flags & NFT_CHAIN_INACTIVE)
1135 return -ENOENT;
96518518
PM		 1136
1137 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1138 if (!skb2)
1139 return -ENOMEM;
1140
84d7fce6 1141 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 1142 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1143 family, table, chain);
1144 if (err < 0)
1145 goto err;
1146
1147 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1148
1149err:
1150 kfree_skb(skb2);
1151 return err;
1152}
1153
0ca743a5
PNA		 1154static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1155 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1156 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1157};
1158
ff3cd7b3 1159static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
0ca743a5
PNA		 1160{
1161 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1162 struct nft_stats __percpu *newstats;
1163 struct nft_stats *stats;
1164 int err;
1165
1166 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1167 if (err < 0)
ff3cd7b3 1168 return ERR_PTR(err);
0ca743a5
PNA		 1169
1170 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
ff3cd7b3 1171 return ERR_PTR(-EINVAL);
0ca743a5 1172
ce355e20 1173 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
0ca743a5 1174 if (newstats == NULL)
ff3cd7b3 1175 return ERR_PTR(-ENOMEM);
0ca743a5
PNA		 1176
1177 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1178 * are not exposed to userspace.
1179 */
e8781f70 1180 preempt_disable();
0ca743a5
PNA		 1181 stats = this_cpu_ptr(newstats);
1182 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1183 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
e8781f70 1184 preempt_enable();
0ca743a5 1185
ff3cd7b3
PNA		 1186 return newstats;
1187}
1188
1189static void nft_chain_stats_replace(struct nft_base_chain *chain,
1190 struct nft_stats __percpu *newstats)
1191{
b88825de
PNA		 1192 if (newstats == NULL)
1193 return;
1194
0ca743a5 1195 if (chain->stats) {
0ca743a5 1196 struct nft_stats __percpu *oldstats =
67a8fc27 1197 nft_dereference(chain->stats);
0ca743a5
PNA		 1198
1199 rcu_assign_pointer(chain->stats, newstats);
1200 synchronize_rcu();
1201 free_percpu(oldstats);
1202 } else
1203 rcu_assign_pointer(chain->stats, newstats);
0ca743a5
PNA		 1204}
1205
91c7b38d
PNA		 1206static void nf_tables_chain_destroy(struct nft_chain *chain)
1207{
1208 BUG_ON(chain->use > 0);
1209
1210 if (chain->flags & NFT_BASE_CHAIN) {
2cbce139
PNA		 1211 struct nft_base_chain *basechain = nft_base_chain(chain);
1212
1213 module_put(basechain->type->owner);
1214 free_percpu(basechain->stats);
1215 if (basechain->ops[0].dev != NULL)
1216 dev_put(basechain->ops[0].dev);
1217 kfree(basechain);
91c7b38d
PNA		 1218 } else {
1219 kfree(chain);
1220 }
1221}
1222
633c9a84
PNA		 1223static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1224 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 1225 const struct nlattr * const nla[])
1226{
1227 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1228 const struct nlattr * uninitialized_var(name);
7c95f6d8 1229 struct nft_af_info *afi;
96518518
PM		 1230 struct nft_table *table;
1231 struct nft_chain *chain;
0ca743a5 1232 struct nft_base_chain *basechain = NULL;
96518518
PM		 1233 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1234 int family = nfmsg->nfgen_family;
2cbce139 1235 struct net_device *dev = NULL;
57de2a0c 1236 u8 policy = NF_ACCEPT;
96518518 1237 u64 handle = 0;
115a60b1 1238 unsigned int i;
ff3cd7b3 1239 struct nft_stats __percpu *stats;
96518518
PM		 1240 int err;
1241 bool create;
91c7b38d 1242 struct nft_ctx ctx;
96518518
PM		 1243
1244 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1245
99633ab2 1246 afi = nf_tables_afinfo_lookup(net, family, true);
96518518
PM		 1247 if (IS_ERR(afi))
1248 return PTR_ERR(afi);
1249
9370761c 1250 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
96518518
PM		 1251 if (IS_ERR(table))
1252 return PTR_ERR(table);
1253
96518518
PM		 1254 chain = NULL;
1255 name = nla[NFTA_CHAIN_NAME];
1256
1257 if (nla[NFTA_CHAIN_HANDLE]) {
1258 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1259 chain = nf_tables_chain_lookup_byhandle(table, handle);
1260 if (IS_ERR(chain))
1261 return PTR_ERR(chain);
1262 } else {
1263 chain = nf_tables_chain_lookup(table, name);
1264 if (IS_ERR(chain)) {
1265 if (PTR_ERR(chain) != -ENOENT)
1266 return PTR_ERR(chain);
1267 chain = NULL;
1268 }
1269 }
1270
57de2a0c
PM		 1271 if (nla[NFTA_CHAIN_POLICY]) {
1272 if ((chain != NULL &&
d6b6cb1d
PNA		 1273 !(chain->flags & NFT_BASE_CHAIN)))
1274 return -EOPNOTSUPP;
1275
1276 if (chain == NULL &&
57de2a0c
PM		 1277 nla[NFTA_CHAIN_HOOK] == NULL)
1278 return -EOPNOTSUPP;
1279
8f46df18 1280 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
57de2a0c
PM		 1281 switch (policy) {
1282 case NF_DROP:
1283 case NF_ACCEPT:
1284 break;
1285 default:
1286 return -EINVAL;
1287 }
1288 }
1289
96518518 1290 if (chain != NULL) {
91c7b38d
PNA		 1291 struct nft_stats *stats = NULL;
1292 struct nft_trans *trans;
1293
1294 if (chain->flags & NFT_CHAIN_INACTIVE)
1295 return -ENOENT;
96518518
PM		 1296 if (nlh->nlmsg_flags & NLM_F_EXCL)
1297 return -EEXIST;
1298 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1299 return -EOPNOTSUPP;
1300
1301 if (nla[NFTA_CHAIN_HANDLE] && name &&
1302 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
1303 return -EEXIST;
1304
0ca743a5
PNA		 1305 if (nla[NFTA_CHAIN_COUNTERS]) {
1306 if (!(chain->flags & NFT_BASE_CHAIN))
1307 return -EOPNOTSUPP;
1308
ff3cd7b3
PNA		 1309 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1310 if (IS_ERR(stats))
1311 return PTR_ERR(stats);
0ca743a5
PNA		 1312 }
1313
633c9a84 1314 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
91c7b38d
PNA		 1315 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1316 sizeof(struct nft_trans_chain));
f5553c19
PNA		 1317 if (trans == NULL) {
1318 free_percpu(stats);
91c7b38d 1319 return -ENOMEM;
f5553c19 1320 }
4401a862 1321
91c7b38d
PNA		 1322 nft_trans_chain_stats(trans) = stats;
1323 nft_trans_chain_update(trans) = true;
4401a862 1324
91c7b38d
PNA		 1325 if (nla[NFTA_CHAIN_POLICY])
1326 nft_trans_chain_policy(trans) = policy;
1327 else
1328 nft_trans_chain_policy(trans) = -1;
96518518 1329
91c7b38d
PNA		 1330 if (nla[NFTA_CHAIN_HANDLE] && name) {
1331 nla_strlcpy(nft_trans_chain_name(trans), name,
1332 NFT_CHAIN_MAXNAMELEN);
1333 }
1334 list_add_tail(&trans->list, &net->nft.commit_list);
1335 return 0;
96518518
PM		 1336 }
1337
75820676
PM		 1338 if (table->use == UINT_MAX)
1339 return -EOVERFLOW;
1340
96518518 1341 if (nla[NFTA_CHAIN_HOOK]) {
2a37d755 1342 const struct nf_chain_type *type;
96518518 1343 struct nf_hook_ops *ops;
9370761c 1344 nf_hookfn *hookfn;
115a60b1 1345 u32 hooknum, priority;
9370761c 1346
baae3e62 1347 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
9370761c
PNA		 1348 if (nla[NFTA_CHAIN_TYPE]) {
1349 type = nf_tables_chain_type_lookup(afi,
1350 nla[NFTA_CHAIN_TYPE],
1351 create);
93b0806f
PM		 1352 if (IS_ERR(type))
1353 return PTR_ERR(type);
9370761c 1354 }
96518518
PM		 1355
1356 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1357 nft_hook_policy);
1358 if (err < 0)
1359 return err;
1360 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1361 ha[NFTA_HOOK_PRIORITY] == NULL)
1362 return -EINVAL;
9370761c
PNA		 1363
1364 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1365 if (hooknum >= afi->nhooks)
96518518 1366 return -EINVAL;
115a60b1 1367 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
96518518 1368
baae3e62 1369 if (!(type->hook_mask & (1 << hooknum)))
9370761c 1370 return -EOPNOTSUPP;
fa2c1de0 1371 if (!try_module_get(type->owner))
baae3e62 1372 return -ENOENT;
fa2c1de0 1373 hookfn = type->hooks[hooknum];
9370761c 1374
2cbce139
PNA		 1375 if (afi->flags & NFT_AF_NEEDS_DEV) {
1376 char ifname[IFNAMSIZ];
1377
1378 if (!ha[NFTA_HOOK_DEV]) {
1379 module_put(type->owner);
1380 return -EOPNOTSUPP;
1381 }
1382
1383 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1384 dev = dev_get_by_name(net, ifname);
1385 if (!dev) {
1386 module_put(type->owner);
1387 return -ENOENT;
1388 }
1389 } else if (ha[NFTA_HOOK_DEV]) {
1390 module_put(type->owner);
1391 return -EOPNOTSUPP;
1392 }
1393
96518518 1394 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
f5553c19
PNA		 1395 if (basechain == NULL) {
1396 module_put(type->owner);
2cbce139
PNA		 1397 if (dev != NULL)
1398 dev_put(dev);
96518518 1399 return -ENOMEM;
f5553c19 1400 }
9370761c 1401
2cbce139
PNA		 1402 if (dev != NULL)
1403 strncpy(basechain->dev_name, dev->name, IFNAMSIZ);
1404
4401a862 1405 if (nla[NFTA_CHAIN_COUNTERS]) {
ff3cd7b3
PNA		 1406 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1407 if (IS_ERR(stats)) {
fa2c1de0 1408 module_put(type->owner);
4401a862 1409 kfree(basechain);
2cbce139
PNA		 1410 if (dev != NULL)
1411 dev_put(dev);
ff3cd7b3 1412 return PTR_ERR(stats);
4401a862 1413 }
ff3cd7b3 1414 basechain->stats = stats;
4401a862 1415 } else {
ce355e20 1416 stats = netdev_alloc_pcpu_stats(struct nft_stats);
c123bb71 1417 if (stats == NULL) {
fa2c1de0 1418 module_put(type->owner);
4401a862 1419 kfree(basechain);
2cbce139
PNA		 1420 if (dev != NULL)
1421 dev_put(dev);
c123bb71 1422 return -ENOMEM;
4401a862 1423 }
ff3cd7b3 1424 rcu_assign_pointer(basechain->stats, stats);
4401a862
PM		 1425 }
1426
5ebb335d 1427 write_pnet(&basechain->pnet, net);
9370761c 1428 basechain->type = type;
96518518
PM		 1429 chain = &basechain->chain;
1430
115a60b1
PM		 1431 for (i = 0; i < afi->nops; i++) {
1432 ops = &basechain->ops[i];
1433 ops->pf = family;
115a60b1
PM		 1434 ops->hooknum = hooknum;
1435 ops->priority = priority;
1436 ops->priv = chain;
1437 ops->hook = afi->hooks[ops->hooknum];
2cbce139 1438 ops->dev = dev;
115a60b1
PM		 1439 if (hookfn)
1440 ops->hook = hookfn;
1441 if (afi->hook_ops_init)
1442 afi->hook_ops_init(ops, i);
1443 }
96518518
PM		 1444
1445 chain->flags |= NFT_BASE_CHAIN;
57de2a0c 1446 basechain->policy = policy;
96518518
PM		 1447 } else {
1448 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1449 if (chain == NULL)
1450 return -ENOMEM;
1451 }
1452
1453 INIT_LIST_HEAD(&chain->rules);
1454 chain->handle = nf_tables_alloc_handle(table);
b5bc89bf 1455 chain->table = table;
96518518
PM		 1456 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1457
d8ee8f7c
PNA		 1458 err = nf_tables_register_hooks(table, chain, afi->nops);
1459 if (err < 0)
1460 goto err1;
96518518 1461
633c9a84 1462 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
91c7b38d
PNA		 1463 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1464 if (err < 0)
1465 goto err2;
96518518 1466
4fefee57 1467 table->use++;
e688a7f8 1468 list_add_tail_rcu(&chain->list, &table->chains);
91c7b38d
PNA		 1469 return 0;
1470err2:
c5598794 1471 nf_tables_unregister_hooks(table, chain, afi->nops);
91c7b38d
PNA		 1472err1:
1473 nf_tables_chain_destroy(chain);
1474 return err;
96518518
PM		 1475}
1476
633c9a84
PNA		 1477static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1478 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 1479 const struct nlattr * const nla[])
1480{
1481 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8 1482 struct nft_af_info *afi;
96518518
PM		 1483 struct nft_table *table;
1484 struct nft_chain *chain;
1485 int family = nfmsg->nfgen_family;
91c7b38d 1486 struct nft_ctx ctx;
96518518 1487
99633ab2 1488 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1489 if (IS_ERR(afi))
1490 return PTR_ERR(afi);
1491
9370761c 1492 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
96518518
PM		 1493 if (IS_ERR(table))
1494 return PTR_ERR(table);
1495
1496 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1497 if (IS_ERR(chain))
1498 return PTR_ERR(chain);
4fefee57 1499 if (chain->use > 0)
96518518
PM		 1500 return -EBUSY;
1501
633c9a84 1502 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0165d932 1503
ee01d542 1504 return nft_delchain(&ctx);
96518518
PM		 1505}
1506
96518518
PM		 1507/*
1508 * Expressions
1509 */
1510
1511/**
ef1f7df9
PM		 1512 * nft_register_expr - register nf_tables expr type
1513 * @ops: expr type
96518518 1514 *
ef1f7df9 1515 * Registers the expr type for use with nf_tables. Returns zero on
96518518
PM		 1516 * success or a negative errno code otherwise.
1517 */
ef1f7df9 1518int nft_register_expr(struct nft_expr_type *type)
96518518
PM		 1519{
1520 nfnl_lock(NFNL_SUBSYS_NFTABLES);
758dbcec 1521 if (type->family == NFPROTO_UNSPEC)
e688a7f8 1522 list_add_tail_rcu(&type->list, &nf_tables_expressions);
758dbcec 1523 else
e688a7f8 1524 list_add_rcu(&type->list, &nf_tables_expressions);
96518518
PM		 1525 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1526 return 0;
1527}
1528EXPORT_SYMBOL_GPL(nft_register_expr);
1529
1530/**
ef1f7df9
PM		 1531 * nft_unregister_expr - unregister nf_tables expr type
1532 * @ops: expr type
96518518 1533 *
ef1f7df9 1534 * Unregisters the expr typefor use with nf_tables.
96518518 1535 */
ef1f7df9 1536void nft_unregister_expr(struct nft_expr_type *type)
96518518
PM		 1537{
1538 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 1539 list_del_rcu(&type->list);
96518518
PM		 1540 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1541}
1542EXPORT_SYMBOL_GPL(nft_unregister_expr);
1543
64d46806
PM		 1544static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1545 struct nlattr *nla)
96518518 1546{
ef1f7df9 1547 const struct nft_expr_type *type;
96518518 1548
ef1f7df9 1549 list_for_each_entry(type, &nf_tables_expressions, list) {
64d46806
PM		 1550 if (!nla_strcmp(nla, type->name) &&
1551 (!type->family || type->family == family))
ef1f7df9 1552 return type;
96518518
PM		 1553 }
1554 return NULL;
1555}
1556
64d46806
PM		 1557static const struct nft_expr_type *nft_expr_type_get(u8 family,
1558 struct nlattr *nla)
96518518 1559{
ef1f7df9 1560 const struct nft_expr_type *type;
96518518
PM		 1561
1562 if (nla == NULL)
1563 return ERR_PTR(-EINVAL);
1564
64d46806 1565 type = __nft_expr_type_get(family, nla);
ef1f7df9
PM		 1566 if (type != NULL && try_module_get(type->owner))
1567 return type;
96518518
PM		 1568
1569#ifdef CONFIG_MODULES
ef1f7df9 1570 if (type == NULL) {
64d46806
PM		 1571 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1572 request_module("nft-expr-%u-%.*s", family,
1573 nla_len(nla), (char *)nla_data(nla));
1574 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1575 if (__nft_expr_type_get(family, nla))
1576 return ERR_PTR(-EAGAIN);
1577
96518518
PM		 1578 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1579 request_module("nft-expr-%.*s",
1580 nla_len(nla), (char *)nla_data(nla));
1581 nfnl_lock(NFNL_SUBSYS_NFTABLES);
64d46806 1582 if (__nft_expr_type_get(family, nla))
96518518
PM		 1583 return ERR_PTR(-EAGAIN);
1584 }
1585#endif
1586 return ERR_PTR(-ENOENT);
1587}
1588
1589static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1590 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1591 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1592};
1593
1594static int nf_tables_fill_expr_info(struct sk_buff *skb,
1595 const struct nft_expr *expr)
1596{
ef1f7df9 1597 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
96518518
PM		 1598 goto nla_put_failure;
1599
1600 if (expr->ops->dump) {
1601 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1602 if (data == NULL)
1603 goto nla_put_failure;
1604 if (expr->ops->dump(skb, expr) < 0)
1605 goto nla_put_failure;
1606 nla_nest_end(skb, data);
1607 }
1608
1609 return skb->len;
1610
1611nla_put_failure:
1612 return -1;
1613};
1614
0b2d8a7b
PM		 1615int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1616 const struct nft_expr *expr)
1617{
1618 struct nlattr *nest;
1619
1620 nest = nla_nest_start(skb, attr);
1621 if (!nest)
1622 goto nla_put_failure;
1623 if (nf_tables_fill_expr_info(skb, expr) < 0)
1624 goto nla_put_failure;
1625 nla_nest_end(skb, nest);
1626 return 0;
1627
1628nla_put_failure:
1629 return -1;
1630}
1631
96518518
PM		 1632struct nft_expr_info {
1633 const struct nft_expr_ops *ops;
ef1f7df9 1634 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
96518518
PM		 1635};
1636
0ca743a5
PNA		 1637static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1638 const struct nlattr *nla,
96518518
PM		 1639 struct nft_expr_info *info)
1640{
ef1f7df9 1641 const struct nft_expr_type *type;
96518518 1642 const struct nft_expr_ops *ops;
ef1f7df9 1643 struct nlattr *tb[NFTA_EXPR_MAX + 1];
96518518
PM		 1644 int err;
1645
ef1f7df9 1646 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
96518518
PM		 1647 if (err < 0)
1648 return err;
1649
64d46806 1650 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
ef1f7df9
PM		 1651 if (IS_ERR(type))
1652 return PTR_ERR(type);
1653
1654 if (tb[NFTA_EXPR_DATA]) {
1655 err = nla_parse_nested(info->tb, type->maxattr,
1656 tb[NFTA_EXPR_DATA], type->policy);
1657 if (err < 0)
1658 goto err1;
1659 } else
1660 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1661
1662 if (type->select_ops != NULL) {
0ca743a5
PNA		 1663 ops = type->select_ops(ctx,
1664 (const struct nlattr * const *)info->tb);
ef1f7df9
PM		 1665 if (IS_ERR(ops)) {
1666 err = PTR_ERR(ops);
1667 goto err1;
1668 }
1669 } else
1670 ops = type->ops;
1671
96518518
PM		 1672 info->ops = ops;
1673 return 0;
ef1f7df9
PM		 1674
1675err1:
1676 module_put(type->owner);
1677 return err;
96518518
PM		 1678}
1679
1680static int nf_tables_newexpr(const struct nft_ctx *ctx,
ef1f7df9 1681 const struct nft_expr_info *info,
96518518
PM		 1682 struct nft_expr *expr)
1683{
1684 const struct nft_expr_ops *ops = info->ops;
1685 int err;
1686
1687 expr->ops = ops;
1688 if (ops->init) {
ef1f7df9 1689 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
96518518
PM		 1690 if (err < 0)
1691 goto err1;
1692 }
1693
96518518
PM		 1694 return 0;
1695
1696err1:
1697 expr->ops = NULL;
1698 return err;
1699}
1700
62472bce
PM		 1701static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1702 struct nft_expr *expr)
96518518
PM		 1703{
1704 if (expr->ops->destroy)
62472bce 1705 expr->ops->destroy(ctx, expr);
ef1f7df9 1706 module_put(expr->ops->type->owner);
96518518
PM		 1707}
1708
0b2d8a7b
PM		 1709struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1710 const struct nlattr *nla)
1711{
1712 struct nft_expr_info info;
1713 struct nft_expr *expr;
1714 int err;
1715
1716 err = nf_tables_expr_parse(ctx, nla, &info);
1717 if (err < 0)
1718 goto err1;
1719
1720 err = -ENOMEM;
1721 expr = kzalloc(info.ops->size, GFP_KERNEL);
1722 if (expr == NULL)
1723 goto err2;
1724
1725 err = nf_tables_newexpr(ctx, &info, expr);
1726 if (err < 0)
1727 goto err2;
1728
1729 return expr;
1730err2:
1731 module_put(info.ops->type->owner);
1732err1:
1733 return ERR_PTR(err);
1734}
1735
1736void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1737{
1738 nf_tables_expr_destroy(ctx, expr);
1739 kfree(expr);
1740}
1741
96518518
PM		 1742/*
1743 * Rules
1744 */
1745
1746static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1747 u64 handle)
1748{
1749 struct nft_rule *rule;
1750
1751 // FIXME: this sucks
1752 list_for_each_entry(rule, &chain->rules, list) {
1753 if (handle == rule->handle)
1754 return rule;
1755 }
1756
1757 return ERR_PTR(-ENOENT);
1758}
1759
1760static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1761 const struct nlattr *nla)
1762{
1763 if (nla == NULL)
1764 return ERR_PTR(-EINVAL);
1765
1766 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1767}
1768
1769static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1770 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1771 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1772 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1773 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1774 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
0ca743a5 1775 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
5e948466 1776 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
0768b3b3
PNA		 1777 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1778 .len = NFT_USERDATA_MAXLEN },
96518518
PM		 1779};
1780
84d7fce6
PNA		 1781static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1782 u32 portid, u32 seq, int event,
1783 u32 flags, int family,
96518518
PM		 1784 const struct nft_table *table,
1785 const struct nft_chain *chain,
1786 const struct nft_rule *rule)
1787{
1788 struct nlmsghdr *nlh;
1789 struct nfgenmsg *nfmsg;
1790 const struct nft_expr *expr, *next;
1791 struct nlattr *list;
5e948466
EL		 1792 const struct nft_rule *prule;
1793 int type = event | NFNL_SUBSYS_NFTABLES << 8;
96518518 1794
5e948466 1795 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
96518518
PM		 1796 flags);
1797 if (nlh == NULL)
1798 goto nla_put_failure;
1799
1800 nfmsg = nlmsg_data(nlh);
1801 nfmsg->nfgen_family = family;
1802 nfmsg->version = NFNETLINK_V0;
84d7fce6 1803 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 1804
1805 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1806 goto nla_put_failure;
1807 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1808 goto nla_put_failure;
b46f6ded
ND		 1809 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1810 NFTA_RULE_PAD))
96518518
PM		 1811 goto nla_put_failure;
1812
5e948466
EL		 1813 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1814 prule = list_entry(rule->list.prev, struct nft_rule, list);
1815 if (nla_put_be64(skb, NFTA_RULE_POSITION,
b46f6ded
ND		 1816 cpu_to_be64(prule->handle),
1817 NFTA_RULE_PAD))
5e948466
EL		 1818 goto nla_put_failure;
1819 }
1820
96518518
PM		 1821 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1822 if (list == NULL)
1823 goto nla_put_failure;
1824 nft_rule_for_each_expr(expr, next, rule) {
0b2d8a7b 1825 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
96518518 1826 goto nla_put_failure;
96518518
PM		 1827 }
1828 nla_nest_end(skb, list);
1829
86f1ec32
PM		 1830 if (rule->udata) {
1831 struct nft_userdata *udata = nft_userdata(rule);
1832 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1833 udata->data) < 0)
1834 goto nla_put_failure;
1835 }
0768b3b3 1836
053c095a
JB		 1837 nlmsg_end(skb, nlh);
1838 return 0;
96518518
PM		 1839
1840nla_put_failure:
1841 nlmsg_trim(skb, nlh);
1842 return -1;
1843}
1844
35151d84 1845static int nf_tables_rule_notify(const struct nft_ctx *ctx,
96518518 1846 const struct nft_rule *rule,
35151d84 1847 int event)
96518518
PM		 1848{
1849 struct sk_buff *skb;
96518518
PM		 1850 int err;
1851
128ad332
PNA		 1852 if (!ctx->report &&
1853 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
96518518
PM		 1854 return 0;
1855
1856 err = -ENOBUFS;
1857 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1858 if (skb == NULL)
1859 goto err;
1860
84d7fce6
PNA		 1861 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1862 event, 0, ctx->afi->family, ctx->table,
35151d84 1863 ctx->chain, rule);
96518518
PM		 1864 if (err < 0) {
1865 kfree_skb(skb);
1866 goto err;
1867 }
1868
128ad332
PNA		 1869 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1870 ctx->report, GFP_KERNEL);
96518518 1871err:
128ad332
PNA		 1872 if (err < 0) {
1873 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1874 err);
1875 }
96518518
PM		 1876 return err;
1877}
1878
1879static int nf_tables_dump_rules(struct sk_buff *skb,
1880 struct netlink_callback *cb)
1881{
1882 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1883 const struct nft_af_info *afi;
1884 const struct nft_table *table;
1885 const struct nft_chain *chain;
1886 const struct nft_rule *rule;
1887 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1888 struct net *net = sock_net(skb->sk);
96518518
PM		 1889 int family = nfmsg->nfgen_family;
1890
e688a7f8 1891 rcu_read_lock();
38e029f1
PNA		 1892 cb->seq = net->nft.base_seq;
1893
e688a7f8 1894 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 1895 if (family != NFPROTO_UNSPEC && family != afi->family)
1896 continue;
1897
e688a7f8
PNA		 1898 list_for_each_entry_rcu(table, &afi->tables, list) {
1899 list_for_each_entry_rcu(chain, &table->chains, list) {
1900 list_for_each_entry_rcu(rule, &chain->rules, list) {
0628b123
PNA		 1901 if (!nft_rule_is_active(net, rule))
1902 goto cont;
96518518
PM		 1903 if (idx < s_idx)
1904 goto cont;
1905 if (idx > s_idx)
1906 memset(&cb->args[1], 0,
1907 sizeof(cb->args) - sizeof(cb->args[0]));
84d7fce6 1908 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
96518518
PM		 1909 cb->nlh->nlmsg_seq,
1910 NFT_MSG_NEWRULE,
1911 NLM_F_MULTI | NLM_F_APPEND,
1912 afi->family, table, chain, rule) < 0)
1913 goto done;
38e029f1
PNA		 1914
1915 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 1916cont:
1917 idx++;
1918 }
1919 }
1920 }
1921 }
1922done:
e688a7f8
PNA		 1923 rcu_read_unlock();
1924
96518518
PM		 1925 cb->args[0] = idx;
1926 return skb->len;
1927}
1928
7b8002a1
PNA		 1929static int nf_tables_getrule(struct net *net, struct sock *nlsk,
1930 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 1931 const struct nlattr * const nla[])
1932{
1933 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1934 const struct nft_af_info *afi;
1935 const struct nft_table *table;
1936 const struct nft_chain *chain;
1937 const struct nft_rule *rule;
1938 struct sk_buff *skb2;
1939 int family = nfmsg->nfgen_family;
1940 int err;
1941
1942 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1943 struct netlink_dump_control c = {
1944 .dump = nf_tables_dump_rules,
1945 };
1946 return netlink_dump_start(nlsk, skb, nlh, &c);
1947 }
1948
99633ab2 1949 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1950 if (IS_ERR(afi))
1951 return PTR_ERR(afi);
1952
9370761c 1953 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
96518518
PM		 1954 if (IS_ERR(table))
1955 return PTR_ERR(table);
55dd6f93
PNA		 1956 if (table->flags & NFT_TABLE_INACTIVE)
1957 return -ENOENT;
96518518
PM		 1958
1959 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1960 if (IS_ERR(chain))
1961 return PTR_ERR(chain);
91c7b38d
PNA		 1962 if (chain->flags & NFT_CHAIN_INACTIVE)
1963 return -ENOENT;
96518518
PM		 1964
1965 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1966 if (IS_ERR(rule))
1967 return PTR_ERR(rule);
1968
1969 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1970 if (!skb2)
1971 return -ENOMEM;
1972
84d7fce6 1973 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 1974 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1975 family, table, chain, rule);
1976 if (err < 0)
1977 goto err;
1978
1979 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1980
1981err:
1982 kfree_skb(skb2);
1983 return err;
1984}
1985
62472bce
PM		 1986static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1987 struct nft_rule *rule)
96518518 1988{
96518518
PM		 1989 struct nft_expr *expr;
1990
1991 /*
1992 * Careful: some expressions might not be initialized in case this
1993 * is called on error from nf_tables_newrule().
1994 */
1995 expr = nft_expr_first(rule);
1996 while (expr->ops && expr != nft_expr_last(rule)) {
62472bce 1997 nf_tables_expr_destroy(ctx, expr);
96518518
PM		 1998 expr = nft_expr_next(expr);
1999 }
2000 kfree(rule);
2001}
2002
1081d11b
PNA		 2003#define NFT_RULE_MAXEXPRS 128
2004
2005static struct nft_expr_info *info;
2006
633c9a84
PNA		 2007static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2008 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 2009 const struct nlattr * const nla[])
2010{
2011 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8 2012 struct nft_af_info *afi;
96518518
PM		 2013 struct nft_table *table;
2014 struct nft_chain *chain;
2015 struct nft_rule *rule, *old_rule = NULL;
86f1ec32 2016 struct nft_userdata *udata;
1081d11b 2017 struct nft_trans *trans = NULL;
96518518
PM		 2018 struct nft_expr *expr;
2019 struct nft_ctx ctx;
2020 struct nlattr *tmp;
86f1ec32 2021 unsigned int size, i, n, ulen = 0, usize = 0;
96518518
PM		 2022 int err, rem;
2023 bool create;
5e948466 2024 u64 handle, pos_handle;
96518518
PM		 2025
2026 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2027
99633ab2 2028 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
96518518
PM		 2029 if (IS_ERR(afi))
2030 return PTR_ERR(afi);
2031
9370761c 2032 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
96518518
PM		 2033 if (IS_ERR(table))
2034 return PTR_ERR(table);
2035
2036 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2037 if (IS_ERR(chain))
2038 return PTR_ERR(chain);
2039
2040 if (nla[NFTA_RULE_HANDLE]) {
2041 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2042 rule = __nf_tables_rule_lookup(chain, handle);
2043 if (IS_ERR(rule))
2044 return PTR_ERR(rule);
2045
2046 if (nlh->nlmsg_flags & NLM_F_EXCL)
2047 return -EEXIST;
2048 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2049 old_rule = rule;
2050 else
2051 return -EOPNOTSUPP;
2052 } else {
2053 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2054 return -EINVAL;
2055 handle = nf_tables_alloc_handle(table);
a0a7379e
PNA		 2056
2057 if (chain->use == UINT_MAX)
2058 return -EOVERFLOW;
96518518
PM		 2059 }
2060
5e948466
EL		 2061 if (nla[NFTA_RULE_POSITION]) {
2062 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2063 return -EOPNOTSUPP;
2064
2065 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2066 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2067 if (IS_ERR(old_rule))
2068 return PTR_ERR(old_rule);
2069 }
2070
633c9a84 2071 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0ca743a5 2072
96518518
PM		 2073 n = 0;
2074 size = 0;
2075 if (nla[NFTA_RULE_EXPRESSIONS]) {
2076 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2077 err = -EINVAL;
2078 if (nla_type(tmp) != NFTA_LIST_ELEM)
2079 goto err1;
2080 if (n == NFT_RULE_MAXEXPRS)
2081 goto err1;
0ca743a5 2082 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
96518518
PM		 2083 if (err < 0)
2084 goto err1;
2085 size += info[n].ops->size;
2086 n++;
2087 }
2088 }
9889840f
PM		 2089 /* Check for overflow of dlen field */
2090 err = -EFBIG;
2091 if (size >= 1 << 12)
2092 goto err1;
96518518 2093
86f1ec32 2094 if (nla[NFTA_RULE_USERDATA]) {
0768b3b3 2095 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
86f1ec32
PM		 2096 if (ulen > 0)
2097 usize = sizeof(struct nft_userdata) + ulen;
2098 }
0768b3b3 2099
96518518 2100 err = -ENOMEM;
86f1ec32 2101 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
96518518
PM		 2102 if (rule == NULL)
2103 goto err1;
2104
0628b123
PNA		 2105 nft_rule_activate_next(net, rule);
2106
96518518
PM		 2107 rule->handle = handle;
2108 rule->dlen = size;
86f1ec32 2109 rule->udata = ulen ? 1 : 0;
0768b3b3 2110
86f1ec32
PM		 2111 if (ulen) {
2112 udata = nft_userdata(rule);
2113 udata->len = ulen - 1;
2114 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2115 }
96518518 2116
96518518
PM		 2117 expr = nft_expr_first(rule);
2118 for (i = 0; i < n; i++) {
2119 err = nf_tables_newexpr(&ctx, &info[i], expr);
2120 if (err < 0)
2121 goto err2;
ef1f7df9 2122 info[i].ops = NULL;
96518518
PM		 2123 expr = nft_expr_next(expr);
2124 }
2125
96518518 2126 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
0628b123 2127 if (nft_rule_is_active_next(net, old_rule)) {
ac904ac8 2128 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
b380e5c7 2129 old_rule);
1081d11b 2130 if (trans == NULL) {
0628b123
PNA		 2131 err = -ENOMEM;
2132 goto err2;
2133 }
ee01d542 2134 nft_rule_deactivate_next(net, old_rule);
ac34b861 2135 chain->use--;
5bc5c307 2136 list_add_tail_rcu(&rule->list, &old_rule->list);
0628b123
PNA		 2137 } else {
2138 err = -ENOENT;
2139 goto err2;
2140 }
96518518 2141 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
5e948466
EL		 2142 if (old_rule)
2143 list_add_rcu(&rule->list, &old_rule->list);
2144 else
2145 list_add_tail_rcu(&rule->list, &chain->rules);
2146 else {
2147 if (old_rule)
2148 list_add_tail_rcu(&rule->list, &old_rule->list);
2149 else
2150 list_add_rcu(&rule->list, &chain->rules);
2151 }
96518518 2152
b380e5c7 2153 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
0628b123
PNA		 2154 err = -ENOMEM;
2155 goto err3;
2156 }
4fefee57 2157 chain->use++;
96518518
PM		 2158 return 0;
2159
0628b123
PNA		 2160err3:
2161 list_del_rcu(&rule->list);
96518518 2162err2:
62472bce 2163 nf_tables_rule_destroy(&ctx, rule);
96518518
PM		 2164err1:
2165 for (i = 0; i < n; i++) {
2166 if (info[i].ops != NULL)
ef1f7df9 2167 module_put(info[i].ops->type->owner);
96518518
PM		 2168 }
2169 return err;
2170}
2171
633c9a84
PNA		 2172static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2173 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 2174 const struct nlattr * const nla[])
2175{
2176 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8 2177 struct nft_af_info *afi;
7c95f6d8 2178 struct nft_table *table;
cf9dc09d
PNA		 2179 struct nft_chain *chain = NULL;
2180 struct nft_rule *rule;
0628b123
PNA		 2181 int family = nfmsg->nfgen_family, err = 0;
2182 struct nft_ctx ctx;
96518518 2183
99633ab2 2184 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 2185 if (IS_ERR(afi))
2186 return PTR_ERR(afi);
2187
9370761c 2188 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
96518518
PM		 2189 if (IS_ERR(table))
2190 return PTR_ERR(table);
2191
cf9dc09d
PNA		 2192 if (nla[NFTA_RULE_CHAIN]) {
2193 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2194 if (IS_ERR(chain))
2195 return PTR_ERR(chain);
2196 }
96518518 2197
633c9a84 2198 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0628b123 2199
cf9dc09d
PNA		 2200 if (chain) {
2201 if (nla[NFTA_RULE_HANDLE]) {
2202 rule = nf_tables_rule_lookup(chain,
2203 nla[NFTA_RULE_HANDLE]);
2204 if (IS_ERR(rule))
2205 return PTR_ERR(rule);
96518518 2206
5e266fe7 2207 err = nft_delrule(&ctx, rule);
cf9dc09d 2208 } else {
ce24b721 2209 err = nft_delrule_by_chain(&ctx);
cf9dc09d
PNA		 2210 }
2211 } else {
2212 list_for_each_entry(chain, &table->chains, list) {
2213 ctx.chain = chain;
ce24b721 2214 err = nft_delrule_by_chain(&ctx);
0628b123
PNA		 2215 if (err < 0)
2216 break;
2217 }
2218 }
2219
2220 return err;
2221}
2222
20a69341
PM		 2223/*
2224 * Sets
2225 */
2226
2227static LIST_HEAD(nf_tables_set_ops);
2228
2229int nft_register_set(struct nft_set_ops *ops)
2230{
2231 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2232 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
20a69341
PM		 2233 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2234 return 0;
2235}
2236EXPORT_SYMBOL_GPL(nft_register_set);
2237
2238void nft_unregister_set(struct nft_set_ops *ops)
2239{
2240 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2241 list_del_rcu(&ops->list);
20a69341
PM		 2242 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2243}
2244EXPORT_SYMBOL_GPL(nft_unregister_set);
2245
c50b960c
PM		 2246/*
2247 * Select a set implementation based on the data characteristics and the
2248 * given policy. The total memory use might not be known if no size is
2249 * given, in that case the amount of memory per element is used.
2250 */
2251static const struct nft_set_ops *
2252nft_select_set_ops(const struct nlattr * const nla[],
2253 const struct nft_set_desc *desc,
2254 enum nft_set_policies policy)
20a69341 2255{
c50b960c
PM		 2256 const struct nft_set_ops *ops, *bops;
2257 struct nft_set_estimate est, best;
20a69341
PM		 2258 u32 features;
2259
2260#ifdef CONFIG_MODULES
2261 if (list_empty(&nf_tables_set_ops)) {
2262 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2263 request_module("nft-set");
2264 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2265 if (!list_empty(&nf_tables_set_ops))
2266 return ERR_PTR(-EAGAIN);
2267 }
2268#endif
2269 features = 0;
2270 if (nla[NFTA_SET_FLAGS] != NULL) {
2271 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4a8678ef 2272 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT;
20a69341
PM		 2273 }
2274
c50b960c
PM		 2275 bops = NULL;
2276 best.size = ~0;
2277 best.class = ~0;
2278
20a69341
PM		 2279 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2280 if ((ops->features & features) != features)
2281 continue;
c50b960c
PM		 2282 if (!ops->estimate(desc, features, &est))
2283 continue;
2284
2285 switch (policy) {
2286 case NFT_SET_POL_PERFORMANCE:
2287 if (est.class < best.class)
2288 break;
2289 if (est.class == best.class && est.size < best.size)
2290 break;
2291 continue;
2292 case NFT_SET_POL_MEMORY:
2293 if (est.size < best.size)
2294 break;
2295 if (est.size == best.size && est.class < best.class)
2296 break;
2297 continue;
2298 default:
2299 break;
2300 }
2301
20a69341
PM		 2302 if (!try_module_get(ops->owner))
2303 continue;
c50b960c
PM		 2304 if (bops != NULL)
2305 module_put(bops->owner);
2306
2307 bops = ops;
2308 best = est;
20a69341
PM		 2309 }
2310
c50b960c
PM		 2311 if (bops != NULL)
2312 return bops;
2313
20a69341
PM		 2314 return ERR_PTR(-EOPNOTSUPP);
2315}
2316
2317static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2318 [NFTA_SET_TABLE] = { .type = NLA_STRING },
a9bdd836 2319 [NFTA_SET_NAME] = { .type = NLA_STRING,
cb39ad8b 2320 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341
PM		 2321 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2322 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2323 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2324 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2325 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
c50b960c
PM		 2326 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2327 [NFTA_SET_DESC] = { .type = NLA_NESTED },
958bee14 2328 [NFTA_SET_ID] = { .type = NLA_U32 },
761da293
PM		 2329 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2330 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
e6d8ecac
CFG		 2331 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2332 .len = NFT_USERDATA_MAXLEN },
c50b960c
PM		 2333};
2334
2335static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2336 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
20a69341
PM		 2337};
2338
633c9a84 2339static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 2340 const struct sk_buff *skb,
2341 const struct nlmsghdr *nlh,
2342 const struct nlattr * const nla[])
2343{
2344 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 2345 struct nft_af_info *afi = NULL;
2346 struct nft_table *table = NULL;
20a69341 2347
c9c8e485
PNA		 2348 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2349 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2350 if (IS_ERR(afi))
2351 return PTR_ERR(afi);
2352 }
20a69341
PM		 2353
2354 if (nla[NFTA_SET_TABLE] != NULL) {
ec2c9935
PM		 2355 if (afi == NULL)
2356 return -EAFNOSUPPORT;
2357
9370761c 2358 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
20a69341
PM		 2359 if (IS_ERR(table))
2360 return PTR_ERR(table);
2361 }
2362
633c9a84 2363 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 2364 return 0;
2365}
2366
2367struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2368 const struct nlattr *nla)
2369{
2370 struct nft_set *set;
2371
2372 if (nla == NULL)
2373 return ERR_PTR(-EINVAL);
2374
2375 list_for_each_entry(set, &table->sets, list) {
2376 if (!nla_strcmp(nla, set->name))
2377 return set;
2378 }
2379 return ERR_PTR(-ENOENT);
2380}
2381
958bee14
PNA		 2382struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2383 const struct nlattr *nla)
2384{
2385 struct nft_trans *trans;
2386 u32 id = ntohl(nla_get_be32(nla));
2387
2388 list_for_each_entry(trans, &net->nft.commit_list, list) {
2389 if (trans->msg_type == NFT_MSG_NEWSET &&
2390 id == nft_trans_set_id(trans))
2391 return nft_trans_set(trans);
2392 }
2393 return ERR_PTR(-ENOENT);
2394}
2395
20a69341
PM		 2396static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2397 const char *name)
2398{
2399 const struct nft_set *i;
2400 const char *p;
2401 unsigned long *inuse;
60eb1894 2402 unsigned int n = 0, min = 0;
20a69341 2403
cb39ad8b 2404 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
20a69341
PM		 2405 if (p != NULL) {
2406 if (p[1] != 'd' || strchr(p + 2, '%'))
2407 return -EINVAL;
2408
2409 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2410 if (inuse == NULL)
2411 return -ENOMEM;
60eb1894 2412cont:
20a69341 2413 list_for_each_entry(i, &ctx->table->sets, list) {
14662917
DB		 2414 int tmp;
2415
2416 if (!sscanf(i->name, name, &tmp))
20a69341 2417 continue;
60eb1894 2418 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
20a69341 2419 continue;
14662917 2420
60eb1894 2421 set_bit(tmp - min, inuse);
20a69341
PM		 2422 }
2423
53b70287 2424 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
60eb1894
PM		 2425 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2426 min += BITS_PER_BYTE * PAGE_SIZE;
2427 memset(inuse, 0, PAGE_SIZE);
2428 goto cont;
2429 }
20a69341
PM		 2430 free_page((unsigned long)inuse);
2431 }
2432
60eb1894 2433 snprintf(set->name, sizeof(set->name), name, min + n);
20a69341
PM		 2434 list_for_each_entry(i, &ctx->table->sets, list) {
2435 if (!strcmp(set->name, i->name))
2436 return -ENFILE;
2437 }
2438 return 0;
2439}
2440
2441static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2442 const struct nft_set *set, u16 event, u16 flags)
2443{
2444 struct nfgenmsg *nfmsg;
2445 struct nlmsghdr *nlh;
c50b960c 2446 struct nlattr *desc;
128ad332
PNA		 2447 u32 portid = ctx->portid;
2448 u32 seq = ctx->seq;
20a69341
PM		 2449
2450 event |= NFNL_SUBSYS_NFTABLES << 8;
2451 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2452 flags);
2453 if (nlh == NULL)
2454 goto nla_put_failure;
2455
2456 nfmsg = nlmsg_data(nlh);
2457 nfmsg->nfgen_family = ctx->afi->family;
2458 nfmsg->version = NFNETLINK_V0;
84d7fce6 2459 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
20a69341
PM		 2460
2461 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2462 goto nla_put_failure;
2463 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2464 goto nla_put_failure;
2465 if (set->flags != 0)
2466 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2467 goto nla_put_failure;
2468
2469 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2470 goto nla_put_failure;
2471 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2472 goto nla_put_failure;
2473 if (set->flags & NFT_SET_MAP) {
2474 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2475 goto nla_put_failure;
2476 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2477 goto nla_put_failure;
2478 }
2479
761da293 2480 if (set->timeout &&
b46f6ded
ND		 2481 nla_put_be64(skb, NFTA_SET_TIMEOUT, cpu_to_be64(set->timeout),
2482 NFTA_SET_PAD))
761da293
PM		 2483 goto nla_put_failure;
2484 if (set->gc_int &&
2485 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2486 goto nla_put_failure;
2487
9363dc4b
AB		 2488 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2489 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2490 goto nla_put_failure;
2491 }
2492
e6d8ecac
CFG		 2493 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2494 goto nla_put_failure;
2495
c50b960c
PM		 2496 desc = nla_nest_start(skb, NFTA_SET_DESC);
2497 if (desc == NULL)
2498 goto nla_put_failure;
2499 if (set->size &&
2500 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2501 goto nla_put_failure;
2502 nla_nest_end(skb, desc);
2503
053c095a
JB		 2504 nlmsg_end(skb, nlh);
2505 return 0;
20a69341
PM		 2506
2507nla_put_failure:
2508 nlmsg_trim(skb, nlh);
2509 return -1;
2510}
2511
2512static int nf_tables_set_notify(const struct nft_ctx *ctx,
2513 const struct nft_set *set,
31f8441c 2514 int event, gfp_t gfp_flags)
20a69341
PM		 2515{
2516 struct sk_buff *skb;
128ad332 2517 u32 portid = ctx->portid;
20a69341
PM		 2518 int err;
2519
128ad332
PNA		 2520 if (!ctx->report &&
2521 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
20a69341
PM		 2522 return 0;
2523
2524 err = -ENOBUFS;
31f8441c 2525 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
20a69341
PM		 2526 if (skb == NULL)
2527 goto err;
2528
2529 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2530 if (err < 0) {
2531 kfree_skb(skb);
2532 goto err;
2533 }
2534
128ad332 2535 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
31f8441c 2536 ctx->report, gfp_flags);
20a69341
PM		 2537err:
2538 if (err < 0)
99633ab2 2539 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
20a69341
PM		 2540 return err;
2541}
2542
5b96af77 2543static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
c9c8e485
PNA		 2544{
2545 const struct nft_set *set;
2546 unsigned int idx, s_idx = cb->args[0];
7c95f6d8 2547 struct nft_af_info *afi;
c9c8e485
PNA		 2548 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2549 struct net *net = sock_net(skb->sk);
2550 int cur_family = cb->args[3];
5b96af77 2551 struct nft_ctx *ctx = cb->data, ctx_set;
c9c8e485
PNA		 2552
2553 if (cb->args[1])
2554 return skb->len;
2555
e688a7f8 2556 rcu_read_lock();
38e029f1
PNA		 2557 cb->seq = net->nft.base_seq;
2558
e688a7f8 2559 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
5b96af77
PNA		 2560 if (ctx->afi && ctx->afi != afi)
2561 continue;
2562
c9c8e485
PNA		 2563 if (cur_family) {
2564 if (afi->family != cur_family)
2565 continue;
2566
2567 cur_family = 0;
2568 }
e688a7f8 2569 list_for_each_entry_rcu(table, &afi->tables, list) {
5b96af77
PNA		 2570 if (ctx->table && ctx->table != table)
2571 continue;
2572
c9c8e485
PNA		 2573 if (cur_table) {
2574 if (cur_table != table)
2575 continue;
2576
2577 cur_table = NULL;
2578 }
c9c8e485 2579 idx = 0;
5b96af77 2580 list_for_each_entry_rcu(set, &table->sets, list) {
c9c8e485
PNA		 2581 if (idx < s_idx)
2582 goto cont;
5b96af77
PNA		 2583
2584 ctx_set = *ctx;
2585 ctx_set.table = table;
2586 ctx_set.afi = afi;
2587 if (nf_tables_fill_set(skb, &ctx_set, set,
c9c8e485
PNA		 2588 NFT_MSG_NEWSET,
2589 NLM_F_MULTI) < 0) {
2590 cb->args[0] = idx;
2591 cb->args[2] = (unsigned long) table;
2592 cb->args[3] = afi->family;
2593 goto done;
2594 }
38e029f1 2595 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
c9c8e485
PNA		 2596cont:
2597 idx++;
2598 }
2599 if (s_idx)
2600 s_idx = 0;
2601 }
2602 }
2603 cb->args[1] = 1;
2604done:
e688a7f8 2605 rcu_read_unlock();
c9c8e485
PNA		 2606 return skb->len;
2607}
2608
5b96af77 2609static int nf_tables_dump_sets_done(struct netlink_callback *cb)
20a69341 2610{
5b96af77
PNA		 2611 kfree(cb->data);
2612 return 0;
20a69341
PM		 2613}
2614
7b8002a1
PNA		 2615static int nf_tables_getset(struct net *net, struct sock *nlsk,
2616 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 2617 const struct nlattr * const nla[])
2618{
2619 const struct nft_set *set;
2620 struct nft_ctx ctx;
2621 struct sk_buff *skb2;
c9c8e485 2622 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 2623 int err;
2624
01cfa0a4 2625 /* Verify existence before starting dump */
633c9a84 2626 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla);
20a69341
PM		 2627 if (err < 0)
2628 return err;
2629
2630 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2631 struct netlink_dump_control c = {
2632 .dump = nf_tables_dump_sets,
5b96af77 2633 .done = nf_tables_dump_sets_done,
20a69341 2634 };
5b96af77
PNA		 2635 struct nft_ctx *ctx_dump;
2636
2637 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2638 if (ctx_dump == NULL)
2639 return -ENOMEM;
2640
2641 *ctx_dump = ctx;
2642 c.data = ctx_dump;
2643
20a69341
PM		 2644 return netlink_dump_start(nlsk, skb, nlh, &c);
2645 }
2646
c9c8e485
PNA		 2647 /* Only accept unspec with dump */
2648 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2649 return -EAFNOSUPPORT;
eaa2bcd6
PT		 2650 if (!nla[NFTA_SET_TABLE])
2651 return -EINVAL;
c9c8e485 2652
20a69341
PM		 2653 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2654 if (IS_ERR(set))
2655 return PTR_ERR(set);
958bee14
PNA		 2656 if (set->flags & NFT_SET_INACTIVE)
2657 return -ENOENT;
20a69341
PM		 2658
2659 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2660 if (skb2 == NULL)
2661 return -ENOMEM;
2662
2663 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2664 if (err < 0)
2665 goto err;
2666
2667 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2668
2669err:
2670 kfree_skb(skb2);
2671 return err;
2672}
2673
c50b960c
PM		 2674static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2675 struct nft_set_desc *desc,
2676 const struct nlattr *nla)
2677{
2678 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2679 int err;
2680
2681 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2682 if (err < 0)
2683 return err;
2684
2685 if (da[NFTA_SET_DESC_SIZE] != NULL)
2686 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2687
2688 return 0;
2689}
2690
633c9a84
PNA		 2691static int nf_tables_newset(struct net *net, struct sock *nlsk,
2692 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 2693 const struct nlattr * const nla[])
2694{
2695 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2696 const struct nft_set_ops *ops;
7c95f6d8 2697 struct nft_af_info *afi;
20a69341
PM		 2698 struct nft_table *table;
2699 struct nft_set *set;
2700 struct nft_ctx ctx;
cb39ad8b 2701 char name[NFT_SET_MAXNAMELEN];
20a69341
PM		 2702 unsigned int size;
2703 bool create;
761da293
PM		 2704 u64 timeout;
2705 u32 ktype, dtype, flags, policy, gc_int;
c50b960c 2706 struct nft_set_desc desc;
e6d8ecac
CFG		 2707 unsigned char *udata;
2708 u16 udlen;
20a69341
PM		 2709 int err;
2710
2711 if (nla[NFTA_SET_TABLE] == NULL ||
2712 nla[NFTA_SET_NAME] == NULL ||
958bee14
PNA		 2713 nla[NFTA_SET_KEY_LEN] == NULL ||
2714 nla[NFTA_SET_ID] == NULL)
20a69341
PM		 2715 return -EINVAL;
2716
c50b960c
PM		 2717 memset(&desc, 0, sizeof(desc));
2718
20a69341
PM		 2719 ktype = NFT_DATA_VALUE;
2720 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2721 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2722 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2723 return -EINVAL;
2724 }
2725
c50b960c 2726 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
7d740264 2727 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 2728 return -EINVAL;
2729
2730 flags = 0;
2731 if (nla[NFTA_SET_FLAGS] != NULL) {
2732 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2733 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
7c6c6e95
PM		 2734 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2735 NFT_SET_MAP | NFT_SET_EVAL))
20a69341 2736 return -EINVAL;
7c6c6e95
PM		 2737 /* Only one of both operations is supported */
2738 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL)) ==
2739 (NFT_SET_MAP | NFT_SET_EVAL))
2740 return -EOPNOTSUPP;
20a69341
PM		 2741 }
2742
2743 dtype = 0;
20a69341
PM		 2744 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2745 if (!(flags & NFT_SET_MAP))
2746 return -EINVAL;
2747
2748 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2749 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2750 dtype != NFT_DATA_VERDICT)
2751 return -EINVAL;
2752
2753 if (dtype != NFT_DATA_VERDICT) {
2754 if (nla[NFTA_SET_DATA_LEN] == NULL)
2755 return -EINVAL;
c50b960c 2756 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
7d740264 2757 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 2758 return -EINVAL;
2759 } else
7d740264 2760 desc.dlen = sizeof(struct nft_verdict);
20a69341
PM		 2761 } else if (flags & NFT_SET_MAP)
2762 return -EINVAL;
2763
761da293
PM		 2764 timeout = 0;
2765 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2766 if (!(flags & NFT_SET_TIMEOUT))
2767 return -EINVAL;
2768 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_TIMEOUT]));
2769 }
2770 gc_int = 0;
2771 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2772 if (!(flags & NFT_SET_TIMEOUT))
2773 return -EINVAL;
2774 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2775 }
2776
c50b960c
PM		 2777 policy = NFT_SET_POL_PERFORMANCE;
2778 if (nla[NFTA_SET_POLICY] != NULL)
2779 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2780
2781 if (nla[NFTA_SET_DESC] != NULL) {
2782 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2783 if (err < 0)
2784 return err;
2785 }
2786
20a69341
PM		 2787 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2788
99633ab2 2789 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
20a69341
PM		 2790 if (IS_ERR(afi))
2791 return PTR_ERR(afi);
2792
9370761c 2793 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
20a69341
PM		 2794 if (IS_ERR(table))
2795 return PTR_ERR(table);
2796
633c9a84 2797 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 2798
2799 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2800 if (IS_ERR(set)) {
2801 if (PTR_ERR(set) != -ENOENT)
2802 return PTR_ERR(set);
2803 set = NULL;
2804 }
2805
2806 if (set != NULL) {
2807 if (nlh->nlmsg_flags & NLM_F_EXCL)
2808 return -EEXIST;
2809 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2810 return -EOPNOTSUPP;
2811 return 0;
2812 }
2813
2814 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2815 return -ENOENT;
2816
c50b960c 2817 ops = nft_select_set_ops(nla, &desc, policy);
20a69341
PM		 2818 if (IS_ERR(ops))
2819 return PTR_ERR(ops);
2820
e6d8ecac
CFG		 2821 udlen = 0;
2822 if (nla[NFTA_SET_USERDATA])
2823 udlen = nla_len(nla[NFTA_SET_USERDATA]);
2824
20a69341
PM		 2825 size = 0;
2826 if (ops->privsize != NULL)
2827 size = ops->privsize(nla);
2828
2829 err = -ENOMEM;
e6d8ecac 2830 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
20a69341
PM		 2831 if (set == NULL)
2832 goto err1;
2833
2834 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2835 err = nf_tables_set_alloc_name(&ctx, set, name);
2836 if (err < 0)
2837 goto err2;
2838
e6d8ecac
CFG		 2839 udata = NULL;
2840 if (udlen) {
2841 udata = set->data + size;
2842 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
2843 }
2844
20a69341 2845 INIT_LIST_HEAD(&set->bindings);
cc02e457 2846 write_pnet(&set->pnet, net);
20a69341
PM		 2847 set->ops = ops;
2848 set->ktype = ktype;
c50b960c 2849 set->klen = desc.klen;
20a69341 2850 set->dtype = dtype;
c50b960c 2851 set->dlen = desc.dlen;
20a69341 2852 set->flags = flags;
c50b960c 2853 set->size = desc.size;
9363dc4b 2854 set->policy = policy;
e6d8ecac
CFG		 2855 set->udlen = udlen;
2856 set->udata = udata;
761da293
PM		 2857 set->timeout = timeout;
2858 set->gc_int = gc_int;
20a69341 2859
c50b960c 2860 err = ops->init(set, &desc, nla);
20a69341
PM		 2861 if (err < 0)
2862 goto err2;
2863
958bee14 2864 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
20a69341
PM		 2865 if (err < 0)
2866 goto err2;
2867
e688a7f8 2868 list_add_tail_rcu(&set->list, &table->sets);
4fefee57 2869 table->use++;
20a69341
PM		 2870 return 0;
2871
2872err2:
2873 kfree(set);
2874err1:
2875 module_put(ops->owner);
2876 return err;
2877}
2878
958bee14 2879static void nft_set_destroy(struct nft_set *set)
20a69341 2880{
20a69341
PM		 2881 set->ops->destroy(set);
2882 module_put(set->ops->owner);
2883 kfree(set);
2884}
2885
958bee14
PNA		 2886static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2887{
e688a7f8 2888 list_del_rcu(&set->list);
31f8441c 2889 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
958bee14
PNA		 2890 nft_set_destroy(set);
2891}
2892
633c9a84
PNA		 2893static int nf_tables_delset(struct net *net, struct sock *nlsk,
2894 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 2895 const struct nlattr * const nla[])
2896{
c9c8e485 2897 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 2898 struct nft_set *set;
2899 struct nft_ctx ctx;
2900 int err;
2901
ec2c9935
PM		 2902 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2903 return -EAFNOSUPPORT;
20a69341
PM		 2904 if (nla[NFTA_SET_TABLE] == NULL)
2905 return -EINVAL;
2906
633c9a84 2907 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla);
20a69341
PM		 2908 if (err < 0)
2909 return err;
2910
2911 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2912 if (IS_ERR(set))
2913 return PTR_ERR(set);
2914 if (!list_empty(&set->bindings))
2915 return -EBUSY;
2916
ee01d542 2917 return nft_delset(&ctx, set);
20a69341
PM		 2918}
2919
2920static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2921 const struct nft_set *set,
2922 const struct nft_set_iter *iter,
2923 const struct nft_set_elem *elem)
2924{
fe2811eb 2925 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 2926 enum nft_registers dreg;
2927
2928 dreg = nft_type_to_reg(set->dtype);
1ec10212
PM		 2929 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
2930 set->dtype == NFT_DATA_VERDICT ?
2931 NFT_DATA_VERDICT : NFT_DATA_VALUE,
2932 set->dlen);
20a69341
PM		 2933}
2934
2935int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2936 struct nft_set_binding *binding)
2937{
2938 struct nft_set_binding *i;
2939 struct nft_set_iter iter;
2940
2941 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2942 return -EBUSY;
2943
11113e19 2944 if (binding->flags & NFT_SET_MAP) {
20a69341
PM		 2945 /* If the set is already bound to the same chain all
2946 * jumps are already validated for that chain.
2947 */
2948 list_for_each_entry(i, &set->bindings, list) {
a4684402 2949 if (i->flags & NFT_SET_MAP &&
11113e19 2950 i->chain == binding->chain)
20a69341
PM		 2951 goto bind;
2952 }
2953
8588ac09 2954 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 2955 iter.skip = 0;
2956 iter.count = 0;
2957 iter.err = 0;
2958 iter.fn = nf_tables_bind_check_setelem;
2959
2960 set->ops->walk(ctx, set, &iter);
a02f4248 2961 if (iter.err < 0)
20a69341 2962 return iter.err;
20a69341
PM		 2963 }
2964bind:
2965 binding->chain = ctx->chain;
e688a7f8 2966 list_add_tail_rcu(&binding->list, &set->bindings);
20a69341
PM		 2967 return 0;
2968}
2969
2970void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2971 struct nft_set_binding *binding)
2972{
e688a7f8 2973 list_del_rcu(&binding->list);
20a69341 2974
958bee14
PNA		 2975 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2976 !(set->flags & NFT_SET_INACTIVE))
20a69341
PM		 2977 nf_tables_set_destroy(ctx, set);
2978}
2979
3ac4c07a
PM		 2980const struct nft_set_ext_type nft_set_ext_types[] = {
2981 [NFT_SET_EXT_KEY] = {
7d740264 2982 .align = __alignof__(u32),
3ac4c07a
PM		 2983 },
2984 [NFT_SET_EXT_DATA] = {
7d740264 2985 .align = __alignof__(u32),
3ac4c07a 2986 },
f25ad2e9
PM		 2987 [NFT_SET_EXT_EXPR] = {
2988 .align = __alignof__(struct nft_expr),
2989 },
3ac4c07a
PM		 2990 [NFT_SET_EXT_FLAGS] = {
2991 .len = sizeof(u8),
2992 .align = __alignof__(u8),
2993 },
c3e1b005
PM		 2994 [NFT_SET_EXT_TIMEOUT] = {
2995 .len = sizeof(u64),
2996 .align = __alignof__(u64),
2997 },
2998 [NFT_SET_EXT_EXPIRATION] = {
2999 .len = sizeof(unsigned long),
3000 .align = __alignof__(unsigned long),
3001 },
68e942e8
PM		 3002 [NFT_SET_EXT_USERDATA] = {
3003 .len = sizeof(struct nft_userdata),
3004 .align = __alignof__(struct nft_userdata),
3005 },
3ac4c07a
PM		 3006};
3007EXPORT_SYMBOL_GPL(nft_set_ext_types);
3008
20a69341
PM		 3009/*
3010 * Set elements
3011 */
3012
3013static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3014 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3015 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3016 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
c3e1b005 3017 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
68e942e8
PM		 3018 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3019 .len = NFT_USERDATA_MAXLEN },
20a69341
PM		 3020};
3021
3022static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3023 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
3024 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
3025 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
958bee14 3026 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
20a69341
PM		 3027};
3028
633c9a84 3029static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 3030 const struct sk_buff *skb,
3031 const struct nlmsghdr *nlh,
f4c756b4 3032 const struct nlattr * const nla[])
20a69341
PM		 3033{
3034 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 3035 struct nft_af_info *afi;
3036 struct nft_table *table;
20a69341 3037
99633ab2 3038 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
20a69341
PM		 3039 if (IS_ERR(afi))
3040 return PTR_ERR(afi);
3041
9370761c 3042 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
20a69341
PM		 3043 if (IS_ERR(table))
3044 return PTR_ERR(table);
3045
633c9a84 3046 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 3047 return 0;
3048}
3049
3050static int nf_tables_fill_setelem(struct sk_buff *skb,
3051 const struct nft_set *set,
3052 const struct nft_set_elem *elem)
3053{
fe2811eb 3054 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 3055 unsigned char *b = skb_tail_pointer(skb);
3056 struct nlattr *nest;
3057
3058 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3059 if (nest == NULL)
3060 goto nla_put_failure;
3061
fe2811eb
PM		 3062 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3063 NFT_DATA_VALUE, set->klen) < 0)
20a69341
PM		 3064 goto nla_put_failure;
3065
fe2811eb
PM		 3066 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3067 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
20a69341
PM		 3068 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3069 set->dlen) < 0)
3070 goto nla_put_failure;
3071
f25ad2e9
PM		 3072 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3073 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3074 goto nla_put_failure;
3075
fe2811eb
PM		 3076 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3077 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3078 htonl(*nft_set_ext_flags(ext))))
3079 goto nla_put_failure;
20a69341 3080
c3e1b005
PM		 3081 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3082 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
b46f6ded
ND		 3083 cpu_to_be64(*nft_set_ext_timeout(ext)),
3084 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3085 goto nla_put_failure;
3086
3087 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3088 unsigned long expires, now = jiffies;
3089
3090 expires = *nft_set_ext_expiration(ext);
3091 if (time_before(now, expires))
3092 expires -= now;
3093 else
3094 expires = 0;
3095
3096 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
b46f6ded
ND		 3097 cpu_to_be64(jiffies_to_msecs(expires)),
3098 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3099 goto nla_put_failure;
3100 }
3101
68e942e8
PM		 3102 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3103 struct nft_userdata *udata;
3104
3105 udata = nft_set_ext_userdata(ext);
3106 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3107 udata->len + 1, udata->data))
3108 goto nla_put_failure;
3109 }
3110
20a69341
PM		 3111 nla_nest_end(skb, nest);
3112 return 0;
3113
3114nla_put_failure:
3115 nlmsg_trim(skb, b);
3116 return -EMSGSIZE;
3117}
3118
3119struct nft_set_dump_args {
3120 const struct netlink_callback *cb;
3121 struct nft_set_iter iter;
3122 struct sk_buff *skb;
3123};
3124
3125static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3126 const struct nft_set *set,
3127 const struct nft_set_iter *iter,
3128 const struct nft_set_elem *elem)
3129{
3130 struct nft_set_dump_args *args;
3131
3132 args = container_of(iter, struct nft_set_dump_args, iter);
3133 return nf_tables_fill_setelem(args->skb, set, elem);
3134}
3135
3136static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3137{
633c9a84 3138 struct net *net = sock_net(skb->sk);
20a69341
PM		 3139 const struct nft_set *set;
3140 struct nft_set_dump_args args;
3141 struct nft_ctx ctx;
3142 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3143 struct nfgenmsg *nfmsg;
3144 struct nlmsghdr *nlh;
3145 struct nlattr *nest;
3146 u32 portid, seq;
3147 int event, err;
3148
720e0dfa
MN		 3149 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3150 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
20a69341
PM		 3151 if (err < 0)
3152 return err;
3153
633c9a84 3154 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
f4c756b4 3155 (void *)nla);
20a69341
PM		 3156 if (err < 0)
3157 return err;
f4c756b4
PNA		 3158 if (ctx.table->flags & NFT_TABLE_INACTIVE)
3159 return -ENOENT;
20a69341
PM		 3160
3161 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3162 if (IS_ERR(set))
3163 return PTR_ERR(set);
958bee14
PNA		 3164 if (set->flags & NFT_SET_INACTIVE)
3165 return -ENOENT;
20a69341
PM		 3166
3167 event = NFT_MSG_NEWSETELEM;
3168 event |= NFNL_SUBSYS_NFTABLES << 8;
3169 portid = NETLINK_CB(cb->skb).portid;
3170 seq = cb->nlh->nlmsg_seq;
3171
3172 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3173 NLM_F_MULTI);
3174 if (nlh == NULL)
3175 goto nla_put_failure;
3176
3177 nfmsg = nlmsg_data(nlh);
6403d962 3178 nfmsg->nfgen_family = ctx.afi->family;
20a69341 3179 nfmsg->version = NFNETLINK_V0;
84d7fce6 3180 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
20a69341
PM		 3181
3182 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3183 goto nla_put_failure;
3184 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3185 goto nla_put_failure;
3186
3187 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3188 if (nest == NULL)
3189 goto nla_put_failure;
3190
8588ac09
PNA		 3191 args.cb = cb;
3192 args.skb = skb;
3193 args.iter.genmask = nft_genmask_cur(ctx.net);
3194 args.iter.skip = cb->args[0];
3195 args.iter.count = 0;
3196 args.iter.err = 0;
3197 args.iter.fn = nf_tables_dump_setelem;
20a69341
PM		 3198 set->ops->walk(&ctx, set, &args.iter);
3199
3200 nla_nest_end(skb, nest);
3201 nlmsg_end(skb, nlh);
3202
3203 if (args.iter.err && args.iter.err != -EMSGSIZE)
3204 return args.iter.err;
3205 if (args.iter.count == cb->args[0])
3206 return 0;
3207
3208 cb->args[0] = args.iter.count;
3209 return skb->len;
3210
3211nla_put_failure:
3212 return -ENOSPC;
3213}
3214
7b8002a1
PNA		 3215static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3216 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3217 const struct nlattr * const nla[])
3218{
3219 const struct nft_set *set;
3220 struct nft_ctx ctx;
3221 int err;
3222
f4c756b4 3223 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla);
20a69341
PM		 3224 if (err < 0)
3225 return err;
f4c756b4
PNA		 3226 if (ctx.table->flags & NFT_TABLE_INACTIVE)
3227 return -ENOENT;
20a69341
PM		 3228
3229 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3230 if (IS_ERR(set))
3231 return PTR_ERR(set);
958bee14
PNA		 3232 if (set->flags & NFT_SET_INACTIVE)
3233 return -ENOENT;
20a69341
PM		 3234
3235 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3236 struct netlink_dump_control c = {
3237 .dump = nf_tables_dump_set,
3238 };
3239 return netlink_dump_start(nlsk, skb, nlh, &c);
3240 }
3241 return -EOPNOTSUPP;
3242}
3243
d60ce62f
AB		 3244static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3245 const struct nft_ctx *ctx, u32 seq,
3246 u32 portid, int event, u16 flags,
3247 const struct nft_set *set,
3248 const struct nft_set_elem *elem)
3249{
3250 struct nfgenmsg *nfmsg;
3251 struct nlmsghdr *nlh;
3252 struct nlattr *nest;
3253 int err;
3254
3255 event |= NFNL_SUBSYS_NFTABLES << 8;
3256 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3257 flags);
3258 if (nlh == NULL)
3259 goto nla_put_failure;
3260
3261 nfmsg = nlmsg_data(nlh);
3262 nfmsg->nfgen_family = ctx->afi->family;
3263 nfmsg->version = NFNETLINK_V0;
84d7fce6 3264 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
d60ce62f
AB		 3265
3266 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3267 goto nla_put_failure;
3268 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3269 goto nla_put_failure;
3270
3271 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3272 if (nest == NULL)
3273 goto nla_put_failure;
3274
3275 err = nf_tables_fill_setelem(skb, set, elem);
3276 if (err < 0)
3277 goto nla_put_failure;
3278
3279 nla_nest_end(skb, nest);
3280
053c095a
JB		 3281 nlmsg_end(skb, nlh);
3282 return 0;
d60ce62f
AB		 3283
3284nla_put_failure:
3285 nlmsg_trim(skb, nlh);
3286 return -1;
3287}
3288
3289static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3290 const struct nft_set *set,
3291 const struct nft_set_elem *elem,
3292 int event, u16 flags)
3293{
128ad332
PNA		 3294 struct net *net = ctx->net;
3295 u32 portid = ctx->portid;
d60ce62f
AB		 3296 struct sk_buff *skb;
3297 int err;
3298
128ad332 3299 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
d60ce62f
AB		 3300 return 0;
3301
3302 err = -ENOBUFS;
3303 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3304 if (skb == NULL)
3305 goto err;
3306
3307 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3308 set, elem);
3309 if (err < 0) {
3310 kfree_skb(skb);
3311 goto err;
3312 }
3313
128ad332 3314 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
d60ce62f
AB		 3315 GFP_KERNEL);
3316err:
3317 if (err < 0)
3318 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3319 return err;
3320}
3321
60319eb1
PNA		 3322static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3323 int msg_type,
3324 struct nft_set *set)
3325{
3326 struct nft_trans *trans;
3327
3328 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3329 if (trans == NULL)
3330 return NULL;
3331
3332 nft_trans_elem_set(trans) = set;
3333 return trans;
3334}
3335
22fe54d5
PM		 3336void *nft_set_elem_init(const struct nft_set *set,
3337 const struct nft_set_ext_tmpl *tmpl,
49499c3e 3338 const u32 *key, const u32 *data,
22fe54d5 3339 u64 timeout, gfp_t gfp)
fe2811eb
PM		 3340{
3341 struct nft_set_ext *ext;
3342 void *elem;
3343
3344 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3345 if (elem == NULL)
3346 return NULL;
3347
3348 ext = nft_set_elem_ext(set, elem);
3349 nft_set_ext_init(ext, tmpl);
3350
3351 memcpy(nft_set_ext_key(ext), key, set->klen);
3352 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3353 memcpy(nft_set_ext_data(ext), data, set->dlen);
c3e1b005
PM		 3354 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3355 *nft_set_ext_expiration(ext) =
3356 jiffies + msecs_to_jiffies(timeout);
3357 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3358 *nft_set_ext_timeout(ext) = timeout;
fe2811eb
PM		 3359
3360 return elem;
3361}
3362
61edafbb
PM		 3363void nft_set_elem_destroy(const struct nft_set *set, void *elem)
3364{
3365 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3366
3367 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3368 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3369 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
f25ad2e9
PM		 3370 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3371 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
61edafbb
PM		 3372
3373 kfree(elem);
3374}
3375EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3376
0e9091d6
PNA		 3377static int nft_setelem_parse_flags(const struct nft_set *set,
3378 const struct nlattr *attr, u32 *flags)
3379{
3380 if (attr == NULL)
3381 return 0;
3382
3383 *flags = ntohl(nla_get_be32(attr));
3384 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3385 return -EINVAL;
3386 if (!(set->flags & NFT_SET_INTERVAL) &&
3387 *flags & NFT_SET_ELEM_INTERVAL_END)
3388 return -EINVAL;
3389
3390 return 0;
3391}
3392
60319eb1 3393static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 3394 const struct nlattr *attr)
3395{
3396 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3397 struct nft_data_desc d1, d2;
fe2811eb
PM		 3398 struct nft_set_ext_tmpl tmpl;
3399 struct nft_set_ext *ext;
20a69341
PM		 3400 struct nft_set_elem elem;
3401 struct nft_set_binding *binding;
68e942e8 3402 struct nft_userdata *udata;
fe2811eb 3403 struct nft_data data;
20a69341 3404 enum nft_registers dreg;
60319eb1 3405 struct nft_trans *trans;
0e9091d6 3406 u32 flags = 0;
c3e1b005 3407 u64 timeout;
68e942e8 3408 u8 ulen;
20a69341
PM		 3409 int err;
3410
3411 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3412 nft_set_elem_policy);
3413 if (err < 0)
3414 return err;
3415
3416 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3417 return -EINVAL;
3418
fe2811eb
PM		 3419 nft_set_ext_prepare(&tmpl);
3420
0e9091d6
PNA		 3421 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3422 if (err < 0)
3423 return err;
3424 if (flags != 0)
3425 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
20a69341
PM		 3426
3427 if (set->flags & NFT_SET_MAP) {
3428 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
fe2811eb 3429 !(flags & NFT_SET_ELEM_INTERVAL_END))
20a69341 3430 return -EINVAL;
bd7fc645 3431 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
fe2811eb 3432 flags & NFT_SET_ELEM_INTERVAL_END)
bd7fc645 3433 return -EINVAL;
20a69341
PM		 3434 } else {
3435 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3436 return -EINVAL;
3437 }
3438
c3e1b005
PM		 3439 timeout = 0;
3440 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3441 if (!(set->flags & NFT_SET_TIMEOUT))
3442 return -EINVAL;
3443 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_ELEM_TIMEOUT]));
3444 } else if (set->flags & NFT_SET_TIMEOUT) {
3445 timeout = set->timeout;
3446 }
3447
7d740264 3448 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
d0a11fc3 3449 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 3450 if (err < 0)
3451 goto err1;
3452 err = -EINVAL;
3453 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3454 goto err2;
3455
7d740264 3456 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
c3e1b005
PM		 3457 if (timeout > 0) {
3458 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3459 if (timeout != set->timeout)
3460 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3461 }
fe2811eb 3462
20a69341 3463 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
d0a11fc3
PM		 3464 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3465 nla[NFTA_SET_ELEM_DATA]);
20a69341
PM		 3466 if (err < 0)
3467 goto err2;
3468
3469 err = -EINVAL;
3470 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3471 goto err3;
3472
3473 dreg = nft_type_to_reg(set->dtype);
3474 list_for_each_entry(binding, &set->bindings, list) {
3475 struct nft_ctx bind_ctx = {
3476 .afi = ctx->afi,
3477 .table = ctx->table,
7c95f6d8 3478 .chain = (struct nft_chain *)binding->chain,
20a69341
PM		 3479 };
3480
11113e19
PM		 3481 if (!(binding->flags & NFT_SET_MAP))
3482 continue;
3483
1ec10212
PM		 3484 err = nft_validate_register_store(&bind_ctx, dreg,
3485 &data,
3486 d2.type, d2.len);
20a69341
PM		 3487 if (err < 0)
3488 goto err3;
3489 }
fe2811eb 3490
7d740264 3491 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
20a69341
PM		 3492 }
3493
68e942e8
PM		 3494 /* The full maximum length of userdata can exceed the maximum
3495 * offset value (U8_MAX) for following extensions, therefor it
3496 * must be the last extension added.
3497 */
3498 ulen = 0;
3499 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3500 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3501 if (ulen > 0)
3502 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3503 ulen);
3504 }
3505
fe2811eb 3506 err = -ENOMEM;
7d740264 3507 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
c3e1b005 3508 timeout, GFP_KERNEL);
fe2811eb
PM		 3509 if (elem.priv == NULL)
3510 goto err3;
3511
3512 ext = nft_set_elem_ext(set, elem.priv);
3513 if (flags)
3514 *nft_set_ext_flags(ext) = flags;
68e942e8
PM		 3515 if (ulen > 0) {
3516 udata = nft_set_ext_userdata(ext);
3517 udata->len = ulen - 1;
3518 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3519 }
fe2811eb 3520
60319eb1
PNA		 3521 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3522 if (trans == NULL)
fe2811eb 3523 goto err4;
60319eb1 3524
69086658 3525 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
20a69341
PM		 3526 err = set->ops->insert(set, &elem);
3527 if (err < 0)
fe2811eb 3528 goto err5;
20a69341 3529
60319eb1 3530 nft_trans_elem(trans) = elem;
46bbafce 3531 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
20a69341
PM		 3532 return 0;
3533
fe2811eb 3534err5:
60319eb1 3535 kfree(trans);
fe2811eb
PM		 3536err4:
3537 kfree(elem.priv);
20a69341
PM		 3538err3:
3539 if (nla[NFTA_SET_ELEM_DATA] != NULL)
fe2811eb 3540 nft_data_uninit(&data, d2.type);
20a69341 3541err2:
7d740264 3542 nft_data_uninit(&elem.key.val, d1.type);
20a69341
PM		 3543err1:
3544 return err;
3545}
3546
633c9a84
PNA		 3547static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3548 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3549 const struct nlattr * const nla[])
3550{
3551 const struct nlattr *attr;
3552 struct nft_set *set;
3553 struct nft_ctx ctx;
60319eb1 3554 int rem, err = 0;
20a69341 3555
7d5570ca
PNA		 3556 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3557 return -EINVAL;
3558
f4c756b4 3559 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla);
20a69341
PM		 3560 if (err < 0)
3561 return err;
3562
3563 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
958bee14
PNA		 3564 if (IS_ERR(set)) {
3565 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3566 set = nf_tables_set_lookup_byid(net,
3567 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3568 }
3569 if (IS_ERR(set))
3570 return PTR_ERR(set);
3571 }
3572
20a69341
PM		 3573 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3574 return -EBUSY;
3575
3576 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3dd0673a
PM		 3577 if (set->size &&
3578 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact))
3579 return -ENFILE;
3580
20a69341 3581 err = nft_add_set_elem(&ctx, set, attr);
3dd0673a
PM		 3582 if (err < 0) {
3583 atomic_dec(&set->nelems);
60319eb1 3584 break;
3dd0673a 3585 }
20a69341 3586 }
60319eb1 3587 return err;
20a69341
PM		 3588}
3589
60319eb1 3590static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 3591 const struct nlattr *attr)
3592{
3593 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3971ca14 3594 struct nft_set_ext_tmpl tmpl;
20a69341
PM		 3595 struct nft_data_desc desc;
3596 struct nft_set_elem elem;
3971ca14 3597 struct nft_set_ext *ext;
60319eb1 3598 struct nft_trans *trans;
3971ca14
PNA		 3599 u32 flags = 0;
3600 void *priv;
20a69341
PM		 3601 int err;
3602
3603 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3604 nft_set_elem_policy);
3605 if (err < 0)
3606 goto err1;
3607
3608 err = -EINVAL;
3609 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3610 goto err1;
3611
3971ca14
PNA		 3612 nft_set_ext_prepare(&tmpl);
3613
3614 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3615 if (err < 0)
3616 return err;
3617 if (flags != 0)
3618 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3619
7d740264 3620 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
d0a11fc3 3621 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 3622 if (err < 0)
3623 goto err1;
3624
3625 err = -EINVAL;
3626 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3627 goto err2;
3628
3971ca14
PNA		 3629 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3630
3631 err = -ENOMEM;
3632 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3633 GFP_KERNEL);
3634 if (elem.priv == NULL)
3635 goto err2;
3636
3637 ext = nft_set_elem_ext(set, elem.priv);
3638 if (flags)
3639 *nft_set_ext_flags(ext) = flags;
3640
60319eb1 3641 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
609ccf08
JL		 3642 if (trans == NULL) {
3643 err = -ENOMEM;
3971ca14 3644 goto err3;
609ccf08 3645 }
20a69341 3646
3971ca14
PNA		 3647 priv = set->ops->deactivate(set, &elem);
3648 if (priv == NULL) {
cc02e457 3649 err = -ENOENT;
3971ca14 3650 goto err4;
cc02e457 3651 }
3971ca14
PNA		 3652 kfree(elem.priv);
3653 elem.priv = priv;
cc02e457 3654
60319eb1 3655 nft_trans_elem(trans) = elem;
46bbafce 3656 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
0dc13625 3657 return 0;
cc02e457 3658
3971ca14 3659err4:
cc02e457 3660 kfree(trans);
3971ca14
PNA		 3661err3:
3662 kfree(elem.priv);
20a69341 3663err2:
7d740264 3664 nft_data_uninit(&elem.key.val, desc.type);
20a69341
PM		 3665err1:
3666 return err;
3667}
3668
633c9a84
PNA		 3669static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3670 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3671 const struct nlattr * const nla[])
3672{
3673 const struct nlattr *attr;
3674 struct nft_set *set;
3675 struct nft_ctx ctx;
60319eb1 3676 int rem, err = 0;
20a69341 3677
7d5570ca
PNA		 3678 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3679 return -EINVAL;
3680
f4c756b4 3681 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla);
20a69341
PM		 3682 if (err < 0)
3683 return err;
3684
3685 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3686 if (IS_ERR(set))
3687 return PTR_ERR(set);
3688 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3689 return -EBUSY;
3690
3691 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3692 err = nft_del_setelem(&ctx, set, attr);
3693 if (err < 0)
60319eb1 3694 break;
4fefee57 3695
3dd0673a 3696 set->ndeact++;
20a69341 3697 }
60319eb1 3698 return err;
20a69341
PM		 3699}
3700
cfed7e1b
PM		 3701void nft_set_gc_batch_release(struct rcu_head *rcu)
3702{
3703 struct nft_set_gc_batch *gcb;
3704 unsigned int i;
3705
3706 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
3707 for (i = 0; i < gcb->head.cnt; i++)
3708 nft_set_elem_destroy(gcb->head.set, gcb->elems[i]);
3709 kfree(gcb);
3710}
3711EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
3712
3713struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
3714 gfp_t gfp)
3715{
3716 struct nft_set_gc_batch *gcb;
3717
3718 gcb = kzalloc(sizeof(*gcb), gfp);
3719 if (gcb == NULL)
3720 return gcb;
3721 gcb->head.set = set;
3722 return gcb;
3723}
3724EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
3725
84d7fce6
PNA		 3726static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
3727 u32 portid, u32 seq)
3728{
3729 struct nlmsghdr *nlh;
3730 struct nfgenmsg *nfmsg;
3731 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
3732
3733 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
3734 if (nlh == NULL)
3735 goto nla_put_failure;
3736
3737 nfmsg = nlmsg_data(nlh);
3738 nfmsg->nfgen_family = AF_UNSPEC;
3739 nfmsg->version = NFNETLINK_V0;
3740 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3741
3742 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
3743 goto nla_put_failure;
3744
053c095a
JB		 3745 nlmsg_end(skb, nlh);
3746 return 0;
84d7fce6
PNA		 3747
3748nla_put_failure:
3749 nlmsg_trim(skb, nlh);
3750 return -EMSGSIZE;
3751}
3752
3753static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
3754{
3755 struct nlmsghdr *nlh = nlmsg_hdr(skb);
3756 struct sk_buff *skb2;
3757 int err;
3758
3759 if (nlmsg_report(nlh) &&
3760 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3761 return 0;
3762
3763 err = -ENOBUFS;
3764 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3765 if (skb2 == NULL)
3766 goto err;
3767
3768 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3769 nlh->nlmsg_seq);
3770 if (err < 0) {
3771 kfree_skb(skb2);
3772 goto err;
3773 }
3774
3775 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
3776 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
3777err:
3778 if (err < 0) {
3779 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
3780 err);
3781 }
3782 return err;
3783}
3784
7b8002a1
PNA		 3785static int nf_tables_getgen(struct net *net, struct sock *nlsk,
3786 struct sk_buff *skb, const struct nlmsghdr *nlh,
84d7fce6
PNA		 3787 const struct nlattr * const nla[])
3788{
84d7fce6
PNA		 3789 struct sk_buff *skb2;
3790 int err;
3791
3792 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3793 if (skb2 == NULL)
3794 return -ENOMEM;
3795
3796 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3797 nlh->nlmsg_seq);
3798 if (err < 0)
3799 goto err;
3800
3801 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3802err:
3803 kfree_skb(skb2);
3804 return err;
3805}
3806
96518518
PM		 3807static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3808 [NFT_MSG_NEWTABLE] = {
55dd6f93 3809 .call_batch = nf_tables_newtable,
96518518
PM		 3810 .attr_count = NFTA_TABLE_MAX,
3811 .policy = nft_table_policy,
3812 },
3813 [NFT_MSG_GETTABLE] = {
3814 .call = nf_tables_gettable,
3815 .attr_count = NFTA_TABLE_MAX,
3816 .policy = nft_table_policy,
3817 },
3818 [NFT_MSG_DELTABLE] = {
55dd6f93 3819 .call_batch = nf_tables_deltable,
96518518
PM		 3820 .attr_count = NFTA_TABLE_MAX,
3821 .policy = nft_table_policy,
3822 },
3823 [NFT_MSG_NEWCHAIN] = {
91c7b38d 3824 .call_batch = nf_tables_newchain,
96518518
PM		 3825 .attr_count = NFTA_CHAIN_MAX,
3826 .policy = nft_chain_policy,
3827 },
3828 [NFT_MSG_GETCHAIN] = {
3829 .call = nf_tables_getchain,
3830 .attr_count = NFTA_CHAIN_MAX,
3831 .policy = nft_chain_policy,
3832 },
3833 [NFT_MSG_DELCHAIN] = {
91c7b38d 3834 .call_batch = nf_tables_delchain,
96518518
PM		 3835 .attr_count = NFTA_CHAIN_MAX,
3836 .policy = nft_chain_policy,
3837 },
3838 [NFT_MSG_NEWRULE] = {
0628b123 3839 .call_batch = nf_tables_newrule,
96518518
PM		 3840 .attr_count = NFTA_RULE_MAX,
3841 .policy = nft_rule_policy,
3842 },
3843 [NFT_MSG_GETRULE] = {
3844 .call = nf_tables_getrule,
3845 .attr_count = NFTA_RULE_MAX,
3846 .policy = nft_rule_policy,
3847 },
3848 [NFT_MSG_DELRULE] = {
0628b123 3849 .call_batch = nf_tables_delrule,
96518518
PM		 3850 .attr_count = NFTA_RULE_MAX,
3851 .policy = nft_rule_policy,
3852 },
20a69341 3853 [NFT_MSG_NEWSET] = {
958bee14 3854 .call_batch = nf_tables_newset,
20a69341
PM		 3855 .attr_count = NFTA_SET_MAX,
3856 .policy = nft_set_policy,
3857 },
3858 [NFT_MSG_GETSET] = {
3859 .call = nf_tables_getset,
3860 .attr_count = NFTA_SET_MAX,
3861 .policy = nft_set_policy,
3862 },
3863 [NFT_MSG_DELSET] = {
958bee14 3864 .call_batch = nf_tables_delset,
20a69341
PM		 3865 .attr_count = NFTA_SET_MAX,
3866 .policy = nft_set_policy,
3867 },
3868 [NFT_MSG_NEWSETELEM] = {
958bee14 3869 .call_batch = nf_tables_newsetelem,
20a69341
PM		 3870 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3871 .policy = nft_set_elem_list_policy,
3872 },
3873 [NFT_MSG_GETSETELEM] = {
3874 .call = nf_tables_getsetelem,
3875 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3876 .policy = nft_set_elem_list_policy,
3877 },
3878 [NFT_MSG_DELSETELEM] = {
958bee14 3879 .call_batch = nf_tables_delsetelem,
20a69341
PM		 3880 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3881 .policy = nft_set_elem_list_policy,
3882 },
84d7fce6
PNA		 3883 [NFT_MSG_GETGEN] = {
3884 .call = nf_tables_getgen,
3885 },
96518518
PM		 3886};
3887
91c7b38d
PNA		 3888static void nft_chain_commit_update(struct nft_trans *trans)
3889{
3890 struct nft_base_chain *basechain;
3891
3892 if (nft_trans_chain_name(trans)[0])
3893 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3894
3895 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3896 return;
3897
3898 basechain = nft_base_chain(trans->ctx.chain);
3899 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3900
3901 switch (nft_trans_chain_policy(trans)) {
3902 case NF_DROP:
3903 case NF_ACCEPT:
3904 basechain->policy = nft_trans_chain_policy(trans);
3905 break;
3906 }
3907}
3908
b326dd37 3909static void nf_tables_commit_release(struct nft_trans *trans)
c7c32e72 3910{
c7c32e72
PNA		 3911 switch (trans->msg_type) {
3912 case NFT_MSG_DELTABLE:
3913 nf_tables_table_destroy(&trans->ctx);
3914 break;
3915 case NFT_MSG_DELCHAIN:
3916 nf_tables_chain_destroy(trans->ctx.chain);
3917 break;
3918 case NFT_MSG_DELRULE:
3919 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3920 break;
3921 case NFT_MSG_DELSET:
3922 nft_set_destroy(nft_trans_set(trans));
3923 break;
61edafbb
PM		 3924 case NFT_MSG_DELSETELEM:
3925 nft_set_elem_destroy(nft_trans_elem_set(trans),
3926 nft_trans_elem(trans).priv);
3927 break;
c7c32e72
PNA		 3928 }
3929 kfree(trans);
3930}
3931
5913beaf 3932static int nf_tables_commit(struct net *net, struct sk_buff *skb)
37082f93 3933{
37082f93 3934 struct nft_trans *trans, *next;
a3716e70 3935 struct nft_trans_elem *te;
37082f93
PNA		 3936
3937 /* Bump generation counter, invalidate any dump in progress */
38e029f1 3938 while (++net->nft.base_seq == 0);
37082f93
PNA		 3939
3940 /* A new generation has just started */
ea4bd995 3941 net->nft.gencursor = nft_gencursor_next(net);
37082f93
PNA		 3942
3943 /* Make sure all packets have left the previous generation before
3944 * purging old rules.
3945 */
3946 synchronize_rcu();
3947
3948 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
b380e5c7 3949 switch (trans->msg_type) {
55dd6f93
PNA		 3950 case NFT_MSG_NEWTABLE:
3951 if (nft_trans_table_update(trans)) {
3952 if (!nft_trans_table_enable(trans)) {
3953 nf_tables_table_disable(trans->ctx.afi,
3954 trans->ctx.table);
3955 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3956 }
3957 } else {
3958 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3959 }
35151d84 3960 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
55dd6f93
PNA		 3961 nft_trans_destroy(trans);
3962 break;
3963 case NFT_MSG_DELTABLE:
35151d84 3964 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
55dd6f93 3965 break;
91c7b38d
PNA		 3966 case NFT_MSG_NEWCHAIN:
3967 if (nft_trans_chain_update(trans))
3968 nft_chain_commit_update(trans);
4fefee57 3969 else
91c7b38d 3970 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
4fefee57 3971
35151d84 3972 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
91c7b38d
PNA		 3973 nft_trans_destroy(trans);
3974 break;
3975 case NFT_MSG_DELCHAIN:
35151d84 3976 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
c5598794
AB		 3977 nf_tables_unregister_hooks(trans->ctx.table,
3978 trans->ctx.chain,
3979 trans->ctx.afi->nops);
91c7b38d 3980 break;
b380e5c7
PNA		 3981 case NFT_MSG_NEWRULE:
3982 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
35151d84 3983 nf_tables_rule_notify(&trans->ctx,
37082f93 3984 nft_trans_rule(trans),
35151d84 3985 NFT_MSG_NEWRULE);
37082f93 3986 nft_trans_destroy(trans);
b380e5c7
PNA		 3987 break;
3988 case NFT_MSG_DELRULE:
3989 list_del_rcu(&nft_trans_rule(trans)->list);
35151d84
PNA		 3990 nf_tables_rule_notify(&trans->ctx,
3991 nft_trans_rule(trans),
3992 NFT_MSG_DELRULE);
b380e5c7 3993 break;
958bee14
PNA		 3994 case NFT_MSG_NEWSET:
3995 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
4fefee57
PNA		 3996 /* This avoids hitting -EBUSY when deleting the table
3997 * from the transaction.
3998 */
3999 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4000 !list_empty(&nft_trans_set(trans)->bindings))
4001 trans->ctx.table->use--;
4002
958bee14 4003 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 4004 NFT_MSG_NEWSET, GFP_KERNEL);
958bee14
PNA		 4005 nft_trans_destroy(trans);
4006 break;
4007 case NFT_MSG_DELSET:
4008 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 4009 NFT_MSG_DELSET, GFP_KERNEL);
958bee14 4010 break;
60319eb1 4011 case NFT_MSG_NEWSETELEM:
cc02e457
PM		 4012 te = (struct nft_trans_elem *)trans->data;
4013
4014 te->set->ops->activate(te->set, &te->elem);
4015 nf_tables_setelem_notify(&trans->ctx, te->set,
4016 &te->elem,
60319eb1
PNA		 4017 NFT_MSG_NEWSETELEM, 0);
4018 nft_trans_destroy(trans);
4019 break;
4020 case NFT_MSG_DELSETELEM:
a3716e70 4021 te = (struct nft_trans_elem *)trans->data;
fe2811eb 4022
a3716e70
PNA		 4023 nf_tables_setelem_notify(&trans->ctx, te->set,
4024 &te->elem,
60319eb1 4025 NFT_MSG_DELSETELEM, 0);
02263db0 4026 te->set->ops->remove(te->set, &te->elem);
3dd0673a
PM		 4027 atomic_dec(&te->set->nelems);
4028 te->set->ndeact--;
60319eb1 4029 break;
37082f93 4030 }
37082f93
PNA		 4031 }
4032
b326dd37
PNA		 4033 synchronize_rcu();
4034
37082f93 4035 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
c7c32e72 4036 list_del(&trans->list);
b326dd37 4037 nf_tables_commit_release(trans);
37082f93 4038 }
84d7fce6
PNA		 4039
4040 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
37082f93
PNA		 4041
4042 return 0;
4043}
4044
b326dd37 4045static void nf_tables_abort_release(struct nft_trans *trans)
c7c32e72 4046{
c7c32e72
PNA		 4047 switch (trans->msg_type) {
4048 case NFT_MSG_NEWTABLE:
4049 nf_tables_table_destroy(&trans->ctx);
4050 break;
4051 case NFT_MSG_NEWCHAIN:
4052 nf_tables_chain_destroy(trans->ctx.chain);
4053 break;
4054 case NFT_MSG_NEWRULE:
4055 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4056 break;
4057 case NFT_MSG_NEWSET:
4058 nft_set_destroy(nft_trans_set(trans));
4059 break;
61edafbb
PM		 4060 case NFT_MSG_NEWSETELEM:
4061 nft_set_elem_destroy(nft_trans_elem_set(trans),
4062 nft_trans_elem(trans).priv);
4063 break;
c7c32e72
PNA		 4064 }
4065 kfree(trans);
4066}
4067
5913beaf 4068static int nf_tables_abort(struct net *net, struct sk_buff *skb)
37082f93 4069{
37082f93 4070 struct nft_trans *trans, *next;
02263db0 4071 struct nft_trans_elem *te;
37082f93 4072
a907e36d
XL		 4073 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4074 list) {
b380e5c7 4075 switch (trans->msg_type) {
55dd6f93
PNA		 4076 case NFT_MSG_NEWTABLE:
4077 if (nft_trans_table_update(trans)) {
4078 if (nft_trans_table_enable(trans)) {
4079 nf_tables_table_disable(trans->ctx.afi,
4080 trans->ctx.table);
4081 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4082 }
4083 nft_trans_destroy(trans);
4084 } else {
e688a7f8 4085 list_del_rcu(&trans->ctx.table->list);
55dd6f93
PNA		 4086 }
4087 break;
4088 case NFT_MSG_DELTABLE:
e688a7f8
PNA		 4089 list_add_tail_rcu(&trans->ctx.table->list,
4090 &trans->ctx.afi->tables);
55dd6f93
PNA		 4091 nft_trans_destroy(trans);
4092 break;
91c7b38d
PNA		 4093 case NFT_MSG_NEWCHAIN:
4094 if (nft_trans_chain_update(trans)) {
982f4051 4095 free_percpu(nft_trans_chain_stats(trans));
91c7b38d
PNA		 4096
4097 nft_trans_destroy(trans);
4098 } else {
4fefee57 4099 trans->ctx.table->use--;
e688a7f8 4100 list_del_rcu(&trans->ctx.chain->list);
c5598794
AB		 4101 nf_tables_unregister_hooks(trans->ctx.table,
4102 trans->ctx.chain,
4103 trans->ctx.afi->nops);
91c7b38d
PNA		 4104 }
4105 break;
4106 case NFT_MSG_DELCHAIN:
4fefee57 4107 trans->ctx.table->use++;
e688a7f8
PNA		 4108 list_add_tail_rcu(&trans->ctx.chain->list,
4109 &trans->ctx.table->chains);
91c7b38d
PNA		 4110 nft_trans_destroy(trans);
4111 break;
b380e5c7 4112 case NFT_MSG_NEWRULE:
4fefee57 4113 trans->ctx.chain->use--;
b380e5c7
PNA		 4114 list_del_rcu(&nft_trans_rule(trans)->list);
4115 break;
4116 case NFT_MSG_DELRULE:
4fefee57 4117 trans->ctx.chain->use++;
b380e5c7 4118 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
37082f93 4119 nft_trans_destroy(trans);
b380e5c7 4120 break;
958bee14 4121 case NFT_MSG_NEWSET:
4fefee57 4122 trans->ctx.table->use--;
e688a7f8 4123 list_del_rcu(&nft_trans_set(trans)->list);
958bee14
PNA		 4124 break;
4125 case NFT_MSG_DELSET:
4fefee57 4126 trans->ctx.table->use++;
e688a7f8
PNA		 4127 list_add_tail_rcu(&nft_trans_set(trans)->list,
4128 &trans->ctx.table->sets);
958bee14
PNA		 4129 nft_trans_destroy(trans);
4130 break;
60319eb1 4131 case NFT_MSG_NEWSETELEM:
02263db0 4132 te = (struct nft_trans_elem *)trans->data;
fe2811eb 4133
02263db0 4134 te->set->ops->remove(te->set, &te->elem);
3dd0673a 4135 atomic_dec(&te->set->nelems);
60319eb1
PNA		 4136 break;
4137 case NFT_MSG_DELSETELEM:
cc02e457
PM		 4138 te = (struct nft_trans_elem *)trans->data;
4139
cc02e457 4140 te->set->ops->activate(te->set, &te->elem);
3dd0673a 4141 te->set->ndeact--;
cc02e457 4142
60319eb1
PNA		 4143 nft_trans_destroy(trans);
4144 break;
37082f93 4145 }
37082f93
PNA		 4146 }
4147
b326dd37
PNA		 4148 synchronize_rcu();
4149
a1cee076
PNA		 4150 list_for_each_entry_safe_reverse(trans, next,
4151 &net->nft.commit_list, list) {
c7c32e72 4152 list_del(&trans->list);
b326dd37 4153 nf_tables_abort_release(trans);
37082f93
PNA		 4154 }
4155
4156 return 0;
4157}
4158
96518518
PM		 4159static const struct nfnetlink_subsystem nf_tables_subsys = {
4160 .name = "nf_tables",
4161 .subsys_id = NFNL_SUBSYS_NFTABLES,
4162 .cb_count = NFT_MSG_MAX,
4163 .cb = nf_tables_cb,
0628b123
PNA		 4164 .commit = nf_tables_commit,
4165 .abort = nf_tables_abort,
96518518
PM		 4166};
4167
7210e4e3
PNA		 4168int nft_chain_validate_dependency(const struct nft_chain *chain,
4169 enum nft_chain_type type)
4170{
4171 const struct nft_base_chain *basechain;
4172
4173 if (chain->flags & NFT_BASE_CHAIN) {
4174 basechain = nft_base_chain(chain);
4175 if (basechain->type->type != type)
4176 return -EOPNOTSUPP;
4177 }
4178 return 0;
4179}
4180EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
4181
75e8d06d
PNA		 4182int nft_chain_validate_hooks(const struct nft_chain *chain,
4183 unsigned int hook_flags)
4184{
4185 struct nft_base_chain *basechain;
4186
4187 if (chain->flags & NFT_BASE_CHAIN) {
4188 basechain = nft_base_chain(chain);
4189
4190 if ((1 << basechain->ops[0].hooknum) & hook_flags)
4191 return 0;
4192
4193 return -EOPNOTSUPP;
4194 }
4195
4196 return 0;
4197}
4198EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
4199
20a69341
PM		 4200/*
4201 * Loop detection - walk through the ruleset beginning at the destination chain
4202 * of a new jump until either the source chain is reached (loop) or all
4203 * reachable chains have been traversed.
4204 *
4205 * The loop check is performed whenever a new jump verdict is added to an
4206 * expression or verdict map or a verdict map is bound to a new chain.
4207 */
4208
4209static int nf_tables_check_loops(const struct nft_ctx *ctx,
4210 const struct nft_chain *chain);
4211
4212static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
4213 const struct nft_set *set,
4214 const struct nft_set_iter *iter,
4215 const struct nft_set_elem *elem)
4216{
fe2811eb
PM		 4217 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4218 const struct nft_data *data;
4219
4220 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4221 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
62f9c8b4
PNA		 4222 return 0;
4223
fe2811eb 4224 data = nft_set_ext_data(ext);
1ca2e170 4225 switch (data->verdict.code) {
20a69341
PM		 4226 case NFT_JUMP:
4227 case NFT_GOTO:
1ca2e170 4228 return nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 4229 default:
4230 return 0;
4231 }
4232}
4233
4234static int nf_tables_check_loops(const struct nft_ctx *ctx,
4235 const struct nft_chain *chain)
4236{
4237 const struct nft_rule *rule;
4238 const struct nft_expr *expr, *last;
20a69341
PM		 4239 const struct nft_set *set;
4240 struct nft_set_binding *binding;
4241 struct nft_set_iter iter;
20a69341
PM		 4242
4243 if (ctx->chain == chain)
4244 return -ELOOP;
4245
4246 list_for_each_entry(rule, &chain->rules, list) {
4247 nft_rule_for_each_expr(expr, last, rule) {
0ca743a5
PNA		 4248 const struct nft_data *data = NULL;
4249 int err;
4250
4251 if (!expr->ops->validate)
20a69341
PM		 4252 continue;
4253
0ca743a5
PNA		 4254 err = expr->ops->validate(ctx, expr, &data);
4255 if (err < 0)
4256 return err;
4257
20a69341 4258 if (data == NULL)
0ca743a5 4259 continue;
20a69341 4260
1ca2e170 4261 switch (data->verdict.code) {
20a69341
PM		 4262 case NFT_JUMP:
4263 case NFT_GOTO:
1ca2e170
PM		 4264 err = nf_tables_check_loops(ctx,
4265 data->verdict.chain);
20a69341
PM		 4266 if (err < 0)
4267 return err;
4268 default:
4269 break;
4270 }
4271 }
4272 }
4273
4274 list_for_each_entry(set, &ctx->table->sets, list) {
4275 if (!(set->flags & NFT_SET_MAP) ||
4276 set->dtype != NFT_DATA_VERDICT)
4277 continue;
4278
4279 list_for_each_entry(binding, &set->bindings, list) {
11113e19
PM		 4280 if (!(binding->flags & NFT_SET_MAP) ||
4281 binding->chain != chain)
20a69341
PM		 4282 continue;
4283
8588ac09 4284 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 4285 iter.skip = 0;
4286 iter.count = 0;
4287 iter.err = 0;
4288 iter.fn = nf_tables_loop_check_setelem;
4289
4290 set->ops->walk(ctx, set, &iter);
4291 if (iter.err < 0)
4292 return iter.err;
4293 }
4294 }
4295
4296 return 0;
4297}
4298
49499c3e
PM		 4299/**
4300 * nft_parse_register - parse a register value from a netlink attribute
4301 *
4302 * @attr: netlink attribute
4303 *
4304 * Parse and translate a register value from a netlink attribute.
4305 * Registers used to be 128 bit wide, these register numbers will be
4306 * mapped to the corresponding 32 bit register numbers.
4307 */
b1c96ed3
PM		 4308unsigned int nft_parse_register(const struct nlattr *attr)
4309{
49499c3e
PM		 4310 unsigned int reg;
4311
4312 reg = ntohl(nla_get_be32(attr));
4313 switch (reg) {
4314 case NFT_REG_VERDICT...NFT_REG_4:
4315 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
4316 default:
4317 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
4318 }
b1c96ed3
PM		 4319}
4320EXPORT_SYMBOL_GPL(nft_parse_register);
4321
49499c3e
PM		 4322/**
4323 * nft_dump_register - dump a register value to a netlink attribute
4324 *
4325 * @skb: socket buffer
4326 * @attr: attribute number
4327 * @reg: register number
4328 *
4329 * Construct a netlink attribute containing the register number. For
4330 * compatibility reasons, register numbers being a multiple of 4 are
4331 * translated to the corresponding 128 bit register numbers.
4332 */
b1c96ed3
PM		 4333int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
4334{
49499c3e
PM		 4335 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
4336 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
4337 else
4338 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
4339
b1c96ed3
PM		 4340 return nla_put_be32(skb, attr, htonl(reg));
4341}
4342EXPORT_SYMBOL_GPL(nft_dump_register);
4343
96518518 4344/**
d07db988 4345 * nft_validate_register_load - validate a load from a register
96518518
PM		 4346 *
4347 * @reg: the register number
d07db988 4348 * @len: the length of the data
96518518
PM		 4349 *
4350 * Validate that the input register is one of the general purpose
d07db988 4351 * registers and that the length of the load is within the bounds.
96518518 4352 */
d07db988 4353int nft_validate_register_load(enum nft_registers reg, unsigned int len)
96518518 4354{
49499c3e 4355 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
96518518 4356 return -EINVAL;
d07db988
PM		 4357 if (len == 0)
4358 return -EINVAL;
49499c3e 4359 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
d07db988 4360 return -ERANGE;
49499c3e 4361
96518518
PM		 4362 return 0;
4363}
d07db988 4364EXPORT_SYMBOL_GPL(nft_validate_register_load);
96518518 4365
96518518 4366/**
1ec10212 4367 * nft_validate_register_store - validate an expressions' register store
96518518
PM		 4368 *
4369 * @ctx: context of the expression performing the load
4370 * @reg: the destination register number
4371 * @data: the data to load
4372 * @type: the data type
45d9bcda 4373 * @len: the length of the data
96518518
PM		 4374 *
4375 * Validate that a data load uses the appropriate data type for
45d9bcda
PM		 4376 * the destination register and the length is within the bounds.
4377 * A value of NULL for the data means that its runtime gathered
58f40ab6 4378 * data.
96518518 4379 */
1ec10212
PM		 4380int nft_validate_register_store(const struct nft_ctx *ctx,
4381 enum nft_registers reg,
4382 const struct nft_data *data,
4383 enum nft_data_types type, unsigned int len)
96518518 4384{
20a69341
PM		 4385 int err;
4386
96518518
PM		 4387 switch (reg) {
4388 case NFT_REG_VERDICT:
58f40ab6 4389 if (type != NFT_DATA_VERDICT)
96518518 4390 return -EINVAL;
20a69341 4391
58f40ab6 4392 if (data != NULL &&
1ca2e170
PM		 4393 (data->verdict.code == NFT_GOTO ||
4394 data->verdict.code == NFT_JUMP)) {
4395 err = nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 4396 if (err < 0)
4397 return err;
4398
1ca2e170
PM		 4399 if (ctx->chain->level + 1 >
4400 data->verdict.chain->level) {
20a69341
PM		 4401 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
4402 return -EMLINK;
1ca2e170 4403 data->verdict.chain->level = ctx->chain->level + 1;
20a69341
PM		 4404 }
4405 }
4406
96518518
PM		 4407 return 0;
4408 default:
49499c3e 4409 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
27e6d201 4410 return -EINVAL;
45d9bcda
PM		 4411 if (len == 0)
4412 return -EINVAL;
49499c3e
PM		 4413 if (reg * NFT_REG32_SIZE + len >
4414 FIELD_SIZEOF(struct nft_regs, data))
45d9bcda 4415 return -ERANGE;
27e6d201 4416
96518518
PM		 4417 if (data != NULL && type != NFT_DATA_VALUE)
4418 return -EINVAL;
4419 return 0;
4420 }
4421}
1ec10212 4422EXPORT_SYMBOL_GPL(nft_validate_register_store);
96518518
PM		 4423
4424static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
4425 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
4426 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
4427 .len = NFT_CHAIN_MAXNAMELEN - 1 },
4428};
4429
4430static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
4431 struct nft_data_desc *desc, const struct nlattr *nla)
4432{
4433 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
4434 struct nft_chain *chain;
4435 int err;
4436
4437 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
4438 if (err < 0)
4439 return err;
4440
4441 if (!tb[NFTA_VERDICT_CODE])
4442 return -EINVAL;
1ca2e170 4443 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
96518518 4444
1ca2e170 4445 switch (data->verdict.code) {
e0abdadc 4446 default:
1ca2e170 4447 switch (data->verdict.code & NF_VERDICT_MASK) {
e0abdadc
PM		 4448 case NF_ACCEPT:
4449 case NF_DROP:
4450 case NF_QUEUE:
4451 break;
4452 default:
4453 return -EINVAL;
4454 }
4455 /* fall through */
96518518
PM		 4456 case NFT_CONTINUE:
4457 case NFT_BREAK:
4458 case NFT_RETURN:
96518518
PM		 4459 break;
4460 case NFT_JUMP:
4461 case NFT_GOTO:
4462 if (!tb[NFTA_VERDICT_CHAIN])
4463 return -EINVAL;
4464 chain = nf_tables_chain_lookup(ctx->table,
4465 tb[NFTA_VERDICT_CHAIN]);
4466 if (IS_ERR(chain))
4467 return PTR_ERR(chain);
4468 if (chain->flags & NFT_BASE_CHAIN)
4469 return -EOPNOTSUPP;
4470
96518518 4471 chain->use++;
1ca2e170 4472 data->verdict.chain = chain;
96518518 4473 break;
96518518
PM		 4474 }
4475
4c4ed074 4476 desc->len = sizeof(data->verdict);
96518518
PM		 4477 desc->type = NFT_DATA_VERDICT;
4478 return 0;
4479}
4480
4481static void nft_verdict_uninit(const struct nft_data *data)
4482{
1ca2e170 4483 switch (data->verdict.code) {
96518518
PM		 4484 case NFT_JUMP:
4485 case NFT_GOTO:
1ca2e170 4486 data->verdict.chain->use--;
96518518
PM		 4487 break;
4488 }
4489}
4490
33d5a7b1 4491int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
96518518
PM		 4492{
4493 struct nlattr *nest;
4494
33d5a7b1 4495 nest = nla_nest_start(skb, type);
96518518
PM		 4496 if (!nest)
4497 goto nla_put_failure;
4498
33d5a7b1 4499 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
96518518
PM		 4500 goto nla_put_failure;
4501
33d5a7b1 4502 switch (v->code) {
96518518
PM		 4503 case NFT_JUMP:
4504 case NFT_GOTO:
1ca2e170 4505 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
33d5a7b1 4506 v->chain->name))
96518518
PM		 4507 goto nla_put_failure;
4508 }
4509 nla_nest_end(skb, nest);
4510 return 0;
4511
4512nla_put_failure:
4513 return -1;
4514}
4515
d0a11fc3
PM		 4516static int nft_value_init(const struct nft_ctx *ctx,
4517 struct nft_data *data, unsigned int size,
96518518
PM		 4518 struct nft_data_desc *desc, const struct nlattr *nla)
4519{
4520 unsigned int len;
4521
4522 len = nla_len(nla);
4523 if (len == 0)
4524 return -EINVAL;
d0a11fc3 4525 if (len > size)
96518518
PM		 4526 return -EOVERFLOW;
4527
d0a11fc3 4528 nla_memcpy(data->data, nla, len);
96518518
PM		 4529 desc->type = NFT_DATA_VALUE;
4530 desc->len = len;
4531 return 0;
4532}
4533
4534static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
4535 unsigned int len)
4536{
4537 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
4538}
4539
4540static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
d0a11fc3 4541 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
96518518
PM		 4542 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
4543};
4544
4545/**
4546 * nft_data_init - parse nf_tables data netlink attributes
4547 *
4548 * @ctx: context of the expression using the data
4549 * @data: destination struct nft_data
d0a11fc3 4550 * @size: maximum data length
96518518
PM		 4551 * @desc: data description
4552 * @nla: netlink attribute containing data
4553 *
4554 * Parse the netlink data attributes and initialize a struct nft_data.
4555 * The type and length of data are returned in the data description.
4556 *
4557 * The caller can indicate that it only wants to accept data of type
4558 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4559 */
d0a11fc3
PM		 4560int nft_data_init(const struct nft_ctx *ctx,
4561 struct nft_data *data, unsigned int size,
96518518
PM		 4562 struct nft_data_desc *desc, const struct nlattr *nla)
4563{
4564 struct nlattr *tb[NFTA_DATA_MAX + 1];
4565 int err;
4566
4567 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
4568 if (err < 0)
4569 return err;
4570
4571 if (tb[NFTA_DATA_VALUE])
d0a11fc3
PM		 4572 return nft_value_init(ctx, data, size, desc,
4573 tb[NFTA_DATA_VALUE]);
96518518
PM		 4574 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
4575 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
4576 return -EINVAL;
4577}
4578EXPORT_SYMBOL_GPL(nft_data_init);
4579
4580/**
4581 * nft_data_uninit - release a nft_data item
4582 *
4583 * @data: struct nft_data to release
4584 * @type: type of data
4585 *
4586 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4587 * all others need to be released by calling this function.
4588 */
4589void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
4590{
960bd2c2 4591 if (type < NFT_DATA_VERDICT)
96518518 4592 return;
960bd2c2 4593 switch (type) {
96518518
PM		 4594 case NFT_DATA_VERDICT:
4595 return nft_verdict_uninit(data);
4596 default:
4597 WARN_ON(1);
4598 }
4599}
4600EXPORT_SYMBOL_GPL(nft_data_uninit);
4601
4602int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4603 enum nft_data_types type, unsigned int len)
4604{
4605 struct nlattr *nest;
4606 int err;
4607
4608 nest = nla_nest_start(skb, attr);
4609 if (nest == NULL)
4610 return -1;
4611
4612 switch (type) {
4613 case NFT_DATA_VALUE:
4614 err = nft_value_dump(skb, data, len);
4615 break;
4616 case NFT_DATA_VERDICT:
33d5a7b1 4617 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
96518518
PM		 4618 break;
4619 default:
4620 err = -EINVAL;
4621 WARN_ON(1);
4622 }
4623
4624 nla_nest_end(skb, nest);
4625 return err;
4626}
4627EXPORT_SYMBOL_GPL(nft_data_dump);
4628
df05ef87 4629static int __net_init nf_tables_init_net(struct net *net)
99633ab2
PNA		 4630{
4631 INIT_LIST_HEAD(&net->nft.af_info);
0628b123 4632 INIT_LIST_HEAD(&net->nft.commit_list);
38e029f1 4633 net->nft.base_seq = 1;
99633ab2
PNA		 4634 return 0;
4635}
4636
5ebe0b0e
PNA		 4637int __nft_release_basechain(struct nft_ctx *ctx)
4638{
4639 struct nft_rule *rule, *nr;
4640
4641 BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
4642
4643 nf_tables_unregister_hooks(ctx->chain->table, ctx->chain,
4644 ctx->afi->nops);
4645 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
4646 list_del(&rule->list);
4647 ctx->chain->use--;
4648 nf_tables_rule_destroy(ctx, rule);
4649 }
4650 list_del(&ctx->chain->list);
4651 ctx->table->use--;
4652 nf_tables_chain_destroy(ctx->chain);
4653
4654 return 0;
4655}
4656EXPORT_SYMBOL_GPL(__nft_release_basechain);
4657
df05ef87
PNA		 4658/* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
4659static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
4660{
4661 struct nft_table *table, *nt;
4662 struct nft_chain *chain, *nc;
4663 struct nft_rule *rule, *nr;
4664 struct nft_set *set, *ns;
4665 struct nft_ctx ctx = {
4666 .net = net,
4667 .afi = afi,
4668 };
4669
4670 list_for_each_entry_safe(table, nt, &afi->tables, list) {
4671 list_for_each_entry(chain, &table->chains, list)
4672 nf_tables_unregister_hooks(table, chain, afi->nops);
4673 /* No packets are walking on these chains anymore. */
4674 ctx.table = table;
4675 list_for_each_entry(chain, &table->chains, list) {
4676 ctx.chain = chain;
4677 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
4678 list_del(&rule->list);
4679 chain->use--;
4680 nf_tables_rule_destroy(&ctx, rule);
4681 }
4682 }
4683 list_for_each_entry_safe(set, ns, &table->sets, list) {
4684 list_del(&set->list);
4685 table->use--;
4686 nft_set_destroy(set);
4687 }
4688 list_for_each_entry_safe(chain, nc, &table->chains, list) {
4689 list_del(&chain->list);
4690 table->use--;
4691 nf_tables_chain_destroy(chain);
4692 }
4693 list_del(&table->list);
4694 nf_tables_table_destroy(&ctx);
4695 }
4696}
4697
99633ab2
PNA		 4698static struct pernet_operations nf_tables_net_ops = {
4699 .init = nf_tables_init_net,
4700};
4701
96518518
PM		 4702static int __init nf_tables_module_init(void)
4703{
4704 int err;
4705
4706 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4707 GFP_KERNEL);
4708 if (info == NULL) {
4709 err = -ENOMEM;
4710 goto err1;
4711 }
4712
4713 err = nf_tables_core_module_init();
4714 if (err < 0)
4715 goto err2;
4716
4717 err = nfnetlink_subsys_register(&nf_tables_subsys);
4718 if (err < 0)
4719 goto err3;
4720
4721 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
99633ab2 4722 return register_pernet_subsys(&nf_tables_net_ops);
96518518
PM		 4723err3:
4724 nf_tables_core_module_exit();
4725err2:
4726 kfree(info);
4727err1:
4728 return err;
4729}
4730
4731static void __exit nf_tables_module_exit(void)
4732{
99633ab2 4733 unregister_pernet_subsys(&nf_tables_net_ops);
96518518 4734 nfnetlink_subsys_unregister(&nf_tables_subsys);
1b1bc49c 4735 rcu_barrier();
96518518
PM		 4736 nf_tables_core_module_exit();
4737 kfree(info);
4738}
4739
4740module_init(nf_tables_module_init);
4741module_exit(nf_tables_module_exit);
4742
4743MODULE_LICENSE("GPL");
4744MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4745MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
ubuntu-bionic-kernel mirror