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