projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'x86/asm' into x86/urgent, to pick up fix
[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 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi);
45
46 /**
47 * nft_unregister_afinfo - unregister nf_tables address family info
48 *
49 * @afi: address family info to unregister
50 *
51 * Unregister the address family for use with nf_tables.
52 */
53 void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi)
54 {
55 nfnl_lock(NFNL_SUBSYS_NFTABLES);
56 __nft_release_afinfo(net, afi);
57 list_del_rcu(&afi->list);
58 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
59 }
60 EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
61
62 static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
63 {
64 struct nft_af_info *afi;
65
66 list_for_each_entry(afi, &net->nft.af_info, list) {
67 if (afi->family == family)
68 return afi;
69 }
70 return NULL;
71 }
72
73 static struct nft_af_info *
74 nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
75 {
76 struct nft_af_info *afi;
77
78 afi = nft_afinfo_lookup(net, family);
79 if (afi != NULL)
80 return afi;
81 #ifdef CONFIG_MODULES
82 if (autoload) {
83 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
84 request_module("nft-afinfo-%u", family);
85 nfnl_lock(NFNL_SUBSYS_NFTABLES);
86 afi = nft_afinfo_lookup(net, family);
87 if (afi != NULL)
88 return ERR_PTR(-EAGAIN);
89 }
90 #endif
91 return ERR_PTR(-EAFNOSUPPORT);
92 }
93
94 static void nft_ctx_init(struct nft_ctx *ctx,
95 struct net *net,
96 const struct sk_buff *skb,
97 const struct nlmsghdr *nlh,
98 struct nft_af_info *afi,
99 struct nft_table *table,
100 struct nft_chain *chain,
101 const struct nlattr * const *nla)
102 {
103 ctx->net = net;
104 ctx->afi = afi;
105 ctx->table = table;
106 ctx->chain = chain;
107 ctx->nla = nla;
108 ctx->portid = NETLINK_CB(skb).portid;
109 ctx->report = nlmsg_report(nlh);
110 ctx->seq = nlh->nlmsg_seq;
111 }
112
113 static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type,
114 u32 size)
115 {
116 struct nft_trans *trans;
117
118 trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL);
119 if (trans == NULL)
120 return NULL;
121
122 trans->msg_type = msg_type;
123 trans->ctx = *ctx;
124
125 return trans;
126 }
127
128 static void nft_trans_destroy(struct nft_trans *trans)
129 {
130 list_del(&trans->list);
131 kfree(trans);
132 }
133
134 static int nft_register_basechain(struct nft_base_chain *basechain,
135 unsigned int hook_nops)
136 {
137 struct net *net = read_pnet(&basechain->pnet);
138
139 if (basechain->flags & NFT_BASECHAIN_DISABLED)
140 return 0;
141
142 return nf_register_net_hooks(net, basechain->ops, hook_nops);
143 }
144
145 static void nft_unregister_basechain(struct nft_base_chain *basechain,
146 unsigned int hook_nops)
147 {
148 struct net *net = read_pnet(&basechain->pnet);
149
150 if (basechain->flags & NFT_BASECHAIN_DISABLED)
151 return;
152
153 nf_unregister_net_hooks(net, basechain->ops, hook_nops);
154 }
155
156 static int nf_tables_register_hooks(const struct nft_table *table,
157 struct nft_chain *chain,
158 unsigned int hook_nops)
159 {
160 if (table->flags & NFT_TABLE_F_DORMANT ||
161 !(chain->flags & NFT_BASE_CHAIN))
162 return 0;
163
164 return nft_register_basechain(nft_base_chain(chain), hook_nops);
165 }
166
167 static void nf_tables_unregister_hooks(const struct nft_table *table,
168 struct nft_chain *chain,
169 unsigned int hook_nops)
170 {
171 if (table->flags & NFT_TABLE_F_DORMANT ||
172 !(chain->flags & NFT_BASE_CHAIN))
173 return;
174
175 nft_unregister_basechain(nft_base_chain(chain), hook_nops);
176 }
177
178 /* Internal table flags */
179 #define NFT_TABLE_INACTIVE (1 << 15)
180
181 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
182 {
183 struct nft_trans *trans;
184
185 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
186 if (trans == NULL)
187 return -ENOMEM;
188
189 if (msg_type == NFT_MSG_NEWTABLE)
190 ctx->table->flags |= NFT_TABLE_INACTIVE;
191
192 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
193 return 0;
194 }
195
196 static int nft_deltable(struct nft_ctx *ctx)
197 {
198 int err;
199
200 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
201 if (err < 0)
202 return err;
203
204 list_del_rcu(&ctx->table->list);
205 return err;
206 }
207
208 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
209 {
210 struct nft_trans *trans;
211
212 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
213 if (trans == NULL)
214 return -ENOMEM;
215
216 if (msg_type == NFT_MSG_NEWCHAIN)
217 ctx->chain->flags |= NFT_CHAIN_INACTIVE;
218
219 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
220 return 0;
221 }
222
223 static int nft_delchain(struct nft_ctx *ctx)
224 {
225 int err;
226
227 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
228 if (err < 0)
229 return err;
230
231 ctx->table->use--;
232 list_del_rcu(&ctx->chain->list);
233
234 return err;
235 }
236
237 static inline bool
238 nft_rule_is_active(struct net *net, const struct nft_rule *rule)
239 {
240 return (rule->genmask & nft_genmask_cur(net)) == 0;
241 }
242
243 static inline int
244 nft_rule_is_active_next(struct net *net, const struct nft_rule *rule)
245 {
246 return (rule->genmask & nft_genmask_next(net)) == 0;
247 }
248
249 static inline void
250 nft_rule_activate_next(struct net *net, struct nft_rule *rule)
251 {
252 /* Now inactive, will be active in the future */
253 rule->genmask = nft_genmask_cur(net);
254 }
255
256 static inline void
257 nft_rule_deactivate_next(struct net *net, struct nft_rule *rule)
258 {
259 rule->genmask = nft_genmask_next(net);
260 }
261
262 static inline void nft_rule_clear(struct net *net, struct nft_rule *rule)
263 {
264 rule->genmask &= ~nft_genmask_next(net);
265 }
266
267 static int
268 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
269 {
270 /* You cannot delete the same rule twice */
271 if (nft_rule_is_active_next(ctx->net, rule)) {
272 nft_rule_deactivate_next(ctx->net, rule);
273 ctx->chain->use--;
274 return 0;
275 }
276 return -ENOENT;
277 }
278
279 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
280 struct nft_rule *rule)
281 {
282 struct nft_trans *trans;
283
284 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
285 if (trans == NULL)
286 return NULL;
287
288 nft_trans_rule(trans) = rule;
289 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
290
291 return trans;
292 }
293
294 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
295 {
296 struct nft_trans *trans;
297 int err;
298
299 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
300 if (trans == NULL)
301 return -ENOMEM;
302
303 err = nf_tables_delrule_deactivate(ctx, rule);
304 if (err < 0) {
305 nft_trans_destroy(trans);
306 return err;
307 }
308
309 return 0;
310 }
311
312 static int nft_delrule_by_chain(struct nft_ctx *ctx)
313 {
314 struct nft_rule *rule;
315 int err;
316
317 list_for_each_entry(rule, &ctx->chain->rules, list) {
318 err = nft_delrule(ctx, rule);
319 if (err < 0)
320 return err;
321 }
322 return 0;
323 }
324
325 /* Internal set flag */
326 #define NFT_SET_INACTIVE (1 << 15)
327
328 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
329 struct nft_set *set)
330 {
331 struct nft_trans *trans;
332
333 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
334 if (trans == NULL)
335 return -ENOMEM;
336
337 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
338 nft_trans_set_id(trans) =
339 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
340 set->flags |= NFT_SET_INACTIVE;
341 }
342 nft_trans_set(trans) = set;
343 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
344
345 return 0;
346 }
347
348 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
349 {
350 int err;
351
352 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
353 if (err < 0)
354 return err;
355
356 list_del_rcu(&set->list);
357 ctx->table->use--;
358
359 return err;
360 }
361
362 /*
363 * Tables
364 */
365
366 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
367 const struct nlattr *nla)
368 {
369 struct nft_table *table;
370
371 list_for_each_entry(table, &afi->tables, list) {
372 if (!nla_strcmp(nla, table->name))
373 return table;
374 }
375 return NULL;
376 }
377
378 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
379 const struct nlattr *nla)
380 {
381 struct nft_table *table;
382
383 if (nla == NULL)
384 return ERR_PTR(-EINVAL);
385
386 table = nft_table_lookup(afi, nla);
387 if (table != NULL)
388 return table;
389
390 return ERR_PTR(-ENOENT);
391 }
392
393 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
394 {
395 return ++table->hgenerator;
396 }
397
398 static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
399
400 static const struct nf_chain_type *
401 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
402 {
403 int i;
404
405 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
406 if (chain_type[family][i] != NULL &&
407 !nla_strcmp(nla, chain_type[family][i]->name))
408 return chain_type[family][i];
409 }
410 return NULL;
411 }
412
413 static const struct nf_chain_type *
414 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
415 const struct nlattr *nla,
416 bool autoload)
417 {
418 const struct nf_chain_type *type;
419
420 type = __nf_tables_chain_type_lookup(afi->family, nla);
421 if (type != NULL)
422 return type;
423 #ifdef CONFIG_MODULES
424 if (autoload) {
425 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
426 request_module("nft-chain-%u-%.*s", afi->family,
427 nla_len(nla), (const char *)nla_data(nla));
428 nfnl_lock(NFNL_SUBSYS_NFTABLES);
429 type = __nf_tables_chain_type_lookup(afi->family, nla);
430 if (type != NULL)
431 return ERR_PTR(-EAGAIN);
432 }
433 #endif
434 return ERR_PTR(-ENOENT);
435 }
436
437 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
438 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
439 .len = NFT_TABLE_MAXNAMELEN - 1 },
440 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
441 };
442
443 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
444 u32 portid, u32 seq, int event, u32 flags,
445 int family, const struct nft_table *table)
446 {
447 struct nlmsghdr *nlh;
448 struct nfgenmsg *nfmsg;
449
450 event |= NFNL_SUBSYS_NFTABLES << 8;
451 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
452 if (nlh == NULL)
453 goto nla_put_failure;
454
455 nfmsg = nlmsg_data(nlh);
456 nfmsg->nfgen_family = family;
457 nfmsg->version = NFNETLINK_V0;
458 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
459
460 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
461 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
462 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
463 goto nla_put_failure;
464
465 nlmsg_end(skb, nlh);
466 return 0;
467
468 nla_put_failure:
469 nlmsg_trim(skb, nlh);
470 return -1;
471 }
472
473 static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
474 {
475 struct sk_buff *skb;
476 int err;
477
478 if (!ctx->report &&
479 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
480 return 0;
481
482 err = -ENOBUFS;
483 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
484 if (skb == NULL)
485 goto err;
486
487 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
488 event, 0, ctx->afi->family, ctx->table);
489 if (err < 0) {
490 kfree_skb(skb);
491 goto err;
492 }
493
494 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
495 ctx->report, GFP_KERNEL);
496 err:
497 if (err < 0) {
498 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
499 err);
500 }
501 return err;
502 }
503
504 static int nf_tables_dump_tables(struct sk_buff *skb,
505 struct netlink_callback *cb)
506 {
507 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
508 const struct nft_af_info *afi;
509 const struct nft_table *table;
510 unsigned int idx = 0, s_idx = cb->args[0];
511 struct net *net = sock_net(skb->sk);
512 int family = nfmsg->nfgen_family;
513
514 rcu_read_lock();
515 cb->seq = net->nft.base_seq;
516
517 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
518 if (family != NFPROTO_UNSPEC && family != afi->family)
519 continue;
520
521 list_for_each_entry_rcu(table, &afi->tables, list) {
522 if (idx < s_idx)
523 goto cont;
524 if (idx > s_idx)
525 memset(&cb->args[1], 0,
526 sizeof(cb->args) - sizeof(cb->args[0]));
527 if (nf_tables_fill_table_info(skb, net,
528 NETLINK_CB(cb->skb).portid,
529 cb->nlh->nlmsg_seq,
530 NFT_MSG_NEWTABLE,
531 NLM_F_MULTI,
532 afi->family, table) < 0)
533 goto done;
534
535 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
536 cont:
537 idx++;
538 }
539 }
540 done:
541 rcu_read_unlock();
542 cb->args[0] = idx;
543 return skb->len;
544 }
545
546 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
547 struct sk_buff *skb, const struct nlmsghdr *nlh,
548 const struct nlattr * const nla[])
549 {
550 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
551 const struct nft_af_info *afi;
552 const struct nft_table *table;
553 struct sk_buff *skb2;
554 int family = nfmsg->nfgen_family;
555 int err;
556
557 if (nlh->nlmsg_flags & NLM_F_DUMP) {
558 struct netlink_dump_control c = {
559 .dump = nf_tables_dump_tables,
560 };
561 return netlink_dump_start(nlsk, skb, nlh, &c);
562 }
563
564 afi = nf_tables_afinfo_lookup(net, family, false);
565 if (IS_ERR(afi))
566 return PTR_ERR(afi);
567
568 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
569 if (IS_ERR(table))
570 return PTR_ERR(table);
571 if (table->flags & NFT_TABLE_INACTIVE)
572 return -ENOENT;
573
574 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
575 if (!skb2)
576 return -ENOMEM;
577
578 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
579 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
580 family, table);
581 if (err < 0)
582 goto err;
583
584 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
585
586 err:
587 kfree_skb(skb2);
588 return err;
589 }
590
591 static int nf_tables_table_enable(const struct nft_af_info *afi,
592 struct nft_table *table)
593 {
594 struct nft_chain *chain;
595 int err, i = 0;
596
597 list_for_each_entry(chain, &table->chains, list) {
598 if (!(chain->flags & NFT_BASE_CHAIN))
599 continue;
600
601 err = nft_register_basechain(nft_base_chain(chain), afi->nops);
602 if (err < 0)
603 goto err;
604
605 i++;
606 }
607 return 0;
608 err:
609 list_for_each_entry(chain, &table->chains, list) {
610 if (!(chain->flags & NFT_BASE_CHAIN))
611 continue;
612
613 if (i-- <= 0)
614 break;
615
616 nft_unregister_basechain(nft_base_chain(chain), afi->nops);
617 }
618 return err;
619 }
620
621 static void nf_tables_table_disable(const struct nft_af_info *afi,
622 struct nft_table *table)
623 {
624 struct nft_chain *chain;
625
626 list_for_each_entry(chain, &table->chains, list) {
627 if (chain->flags & NFT_BASE_CHAIN)
628 nft_unregister_basechain(nft_base_chain(chain),
629 afi->nops);
630 }
631 }
632
633 static int nf_tables_updtable(struct nft_ctx *ctx)
634 {
635 struct nft_trans *trans;
636 u32 flags;
637 int ret = 0;
638
639 if (!ctx->nla[NFTA_TABLE_FLAGS])
640 return 0;
641
642 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
643 if (flags & ~NFT_TABLE_F_DORMANT)
644 return -EINVAL;
645
646 if (flags == ctx->table->flags)
647 return 0;
648
649 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
650 sizeof(struct nft_trans_table));
651 if (trans == NULL)
652 return -ENOMEM;
653
654 if ((flags & NFT_TABLE_F_DORMANT) &&
655 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
656 nft_trans_table_enable(trans) = false;
657 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
658 ctx->table->flags & NFT_TABLE_F_DORMANT) {
659 ret = nf_tables_table_enable(ctx->afi, ctx->table);
660 if (ret >= 0) {
661 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
662 nft_trans_table_enable(trans) = true;
663 }
664 }
665 if (ret < 0)
666 goto err;
667
668 nft_trans_table_update(trans) = true;
669 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
670 return 0;
671 err:
672 nft_trans_destroy(trans);
673 return ret;
674 }
675
676 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
677 struct sk_buff *skb, const struct nlmsghdr *nlh,
678 const struct nlattr * const nla[])
679 {
680 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
681 const struct nlattr *name;
682 struct nft_af_info *afi;
683 struct nft_table *table;
684 int family = nfmsg->nfgen_family;
685 u32 flags = 0;
686 struct nft_ctx ctx;
687 int err;
688
689 afi = nf_tables_afinfo_lookup(net, family, true);
690 if (IS_ERR(afi))
691 return PTR_ERR(afi);
692
693 name = nla[NFTA_TABLE_NAME];
694 table = nf_tables_table_lookup(afi, name);
695 if (IS_ERR(table)) {
696 if (PTR_ERR(table) != -ENOENT)
697 return PTR_ERR(table);
698 table = NULL;
699 }
700
701 if (table != NULL) {
702 if (table->flags & NFT_TABLE_INACTIVE)
703 return -ENOENT;
704 if (nlh->nlmsg_flags & NLM_F_EXCL)
705 return -EEXIST;
706 if (nlh->nlmsg_flags & NLM_F_REPLACE)
707 return -EOPNOTSUPP;
708
709 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
710 return nf_tables_updtable(&ctx);
711 }
712
713 if (nla[NFTA_TABLE_FLAGS]) {
714 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
715 if (flags & ~NFT_TABLE_F_DORMANT)
716 return -EINVAL;
717 }
718
719 err = -EAFNOSUPPORT;
720 if (!try_module_get(afi->owner))
721 goto err1;
722
723 err = -ENOMEM;
724 table = kzalloc(sizeof(*table), GFP_KERNEL);
725 if (table == NULL)
726 goto err2;
727
728 nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
729 INIT_LIST_HEAD(&table->chains);
730 INIT_LIST_HEAD(&table->sets);
731 table->flags = flags;
732
733 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
734 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
735 if (err < 0)
736 goto err3;
737
738 list_add_tail_rcu(&table->list, &afi->tables);
739 return 0;
740 err3:
741 kfree(table);
742 err2:
743 module_put(afi->owner);
744 err1:
745 return err;
746 }
747
748 static int nft_flush_table(struct nft_ctx *ctx)
749 {
750 int err;
751 struct nft_chain *chain, *nc;
752 struct nft_set *set, *ns;
753
754 list_for_each_entry(chain, &ctx->table->chains, list) {
755 ctx->chain = chain;
756
757 err = nft_delrule_by_chain(ctx);
758 if (err < 0)
759 goto out;
760 }
761
762 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
763 if (set->flags & NFT_SET_ANONYMOUS &&
764 !list_empty(&set->bindings))
765 continue;
766
767 err = nft_delset(ctx, set);
768 if (err < 0)
769 goto out;
770 }
771
772 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
773 ctx->chain = chain;
774
775 err = nft_delchain(ctx);
776 if (err < 0)
777 goto out;
778 }
779
780 err = nft_deltable(ctx);
781 out:
782 return err;
783 }
784
785 static int nft_flush(struct nft_ctx *ctx, int family)
786 {
787 struct nft_af_info *afi;
788 struct nft_table *table, *nt;
789 const struct nlattr * const *nla = ctx->nla;
790 int err = 0;
791
792 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
793 if (family != AF_UNSPEC && afi->family != family)
794 continue;
795
796 ctx->afi = afi;
797 list_for_each_entry_safe(table, nt, &afi->tables, list) {
798 if (nla[NFTA_TABLE_NAME] &&
799 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
800 continue;
801
802 ctx->table = table;
803
804 err = nft_flush_table(ctx);
805 if (err < 0)
806 goto out;
807 }
808 }
809 out:
810 return err;
811 }
812
813 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
814 struct sk_buff *skb, const struct nlmsghdr *nlh,
815 const struct nlattr * const nla[])
816 {
817 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
818 struct nft_af_info *afi;
819 struct nft_table *table;
820 int family = nfmsg->nfgen_family;
821 struct nft_ctx ctx;
822
823 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
824 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
825 return nft_flush(&ctx, family);
826
827 afi = nf_tables_afinfo_lookup(net, family, false);
828 if (IS_ERR(afi))
829 return PTR_ERR(afi);
830
831 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
832 if (IS_ERR(table))
833 return PTR_ERR(table);
834
835 ctx.afi = afi;
836 ctx.table = table;
837
838 return nft_flush_table(&ctx);
839 }
840
841 static void nf_tables_table_destroy(struct nft_ctx *ctx)
842 {
843 BUG_ON(ctx->table->use > 0);
844
845 kfree(ctx->table);
846 module_put(ctx->afi->owner);
847 }
848
849 int nft_register_chain_type(const struct nf_chain_type *ctype)
850 {
851 int err = 0;
852
853 nfnl_lock(NFNL_SUBSYS_NFTABLES);
854 if (chain_type[ctype->family][ctype->type] != NULL) {
855 err = -EBUSY;
856 goto out;
857 }
858 chain_type[ctype->family][ctype->type] = ctype;
859 out:
860 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
861 return err;
862 }
863 EXPORT_SYMBOL_GPL(nft_register_chain_type);
864
865 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
866 {
867 nfnl_lock(NFNL_SUBSYS_NFTABLES);
868 chain_type[ctype->family][ctype->type] = NULL;
869 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
870 }
871 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
872
873 /*
874 * Chains
875 */
876
877 static struct nft_chain *
878 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
879 {
880 struct nft_chain *chain;
881
882 list_for_each_entry(chain, &table->chains, list) {
883 if (chain->handle == handle)
884 return chain;
885 }
886
887 return ERR_PTR(-ENOENT);
888 }
889
890 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
891 const struct nlattr *nla)
892 {
893 struct nft_chain *chain;
894
895 if (nla == NULL)
896 return ERR_PTR(-EINVAL);
897
898 list_for_each_entry(chain, &table->chains, list) {
899 if (!nla_strcmp(nla, chain->name))
900 return chain;
901 }
902
903 return ERR_PTR(-ENOENT);
904 }
905
906 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
907 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
908 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
909 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
910 .len = NFT_CHAIN_MAXNAMELEN - 1 },
911 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
912 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
913 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
914 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
915 };
916
917 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
918 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
919 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
920 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
921 .len = IFNAMSIZ - 1 },
922 };
923
924 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
925 {
926 struct nft_stats *cpu_stats, total;
927 struct nlattr *nest;
928 unsigned int seq;
929 u64 pkts, bytes;
930 int cpu;
931
932 memset(&total, 0, sizeof(total));
933 for_each_possible_cpu(cpu) {
934 cpu_stats = per_cpu_ptr(stats, cpu);
935 do {
936 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
937 pkts = cpu_stats->pkts;
938 bytes = cpu_stats->bytes;
939 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
940 total.pkts += pkts;
941 total.bytes += bytes;
942 }
943 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
944 if (nest == NULL)
945 goto nla_put_failure;
946
947 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
948 NFTA_COUNTER_PAD) ||
949 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
950 NFTA_COUNTER_PAD))
951 goto nla_put_failure;
952
953 nla_nest_end(skb, nest);
954 return 0;
955
956 nla_put_failure:
957 return -ENOSPC;
958 }
959
960 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
961 u32 portid, u32 seq, int event, u32 flags,
962 int family, const struct nft_table *table,
963 const struct nft_chain *chain)
964 {
965 struct nlmsghdr *nlh;
966 struct nfgenmsg *nfmsg;
967
968 event |= NFNL_SUBSYS_NFTABLES << 8;
969 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
970 if (nlh == NULL)
971 goto nla_put_failure;
972
973 nfmsg = nlmsg_data(nlh);
974 nfmsg->nfgen_family = family;
975 nfmsg->version = NFNETLINK_V0;
976 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
977
978 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
979 goto nla_put_failure;
980 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
981 NFTA_CHAIN_PAD))
982 goto nla_put_failure;
983 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
984 goto nla_put_failure;
985
986 if (chain->flags & NFT_BASE_CHAIN) {
987 const struct nft_base_chain *basechain = nft_base_chain(chain);
988 const struct nf_hook_ops *ops = &basechain->ops[0];
989 struct nlattr *nest;
990
991 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
992 if (nest == NULL)
993 goto nla_put_failure;
994 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
995 goto nla_put_failure;
996 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
997 goto nla_put_failure;
998 if (basechain->dev_name[0] &&
999 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1000 goto nla_put_failure;
1001 nla_nest_end(skb, nest);
1002
1003 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1004 htonl(basechain->policy)))
1005 goto nla_put_failure;
1006
1007 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1008 goto nla_put_failure;
1009
1010 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
1011 goto nla_put_failure;
1012 }
1013
1014 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1015 goto nla_put_failure;
1016
1017 nlmsg_end(skb, nlh);
1018 return 0;
1019
1020 nla_put_failure:
1021 nlmsg_trim(skb, nlh);
1022 return -1;
1023 }
1024
1025 static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1026 {
1027 struct sk_buff *skb;
1028 int err;
1029
1030 if (!ctx->report &&
1031 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1032 return 0;
1033
1034 err = -ENOBUFS;
1035 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1036 if (skb == NULL)
1037 goto err;
1038
1039 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1040 event, 0, ctx->afi->family, ctx->table,
1041 ctx->chain);
1042 if (err < 0) {
1043 kfree_skb(skb);
1044 goto err;
1045 }
1046
1047 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1048 ctx->report, GFP_KERNEL);
1049 err:
1050 if (err < 0) {
1051 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1052 err);
1053 }
1054 return err;
1055 }
1056
1057 static int nf_tables_dump_chains(struct sk_buff *skb,
1058 struct netlink_callback *cb)
1059 {
1060 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1061 const struct nft_af_info *afi;
1062 const struct nft_table *table;
1063 const struct nft_chain *chain;
1064 unsigned int idx = 0, s_idx = cb->args[0];
1065 struct net *net = sock_net(skb->sk);
1066 int family = nfmsg->nfgen_family;
1067
1068 rcu_read_lock();
1069 cb->seq = net->nft.base_seq;
1070
1071 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1072 if (family != NFPROTO_UNSPEC && family != afi->family)
1073 continue;
1074
1075 list_for_each_entry_rcu(table, &afi->tables, list) {
1076 list_for_each_entry_rcu(chain, &table->chains, list) {
1077 if (idx < s_idx)
1078 goto cont;
1079 if (idx > s_idx)
1080 memset(&cb->args[1], 0,
1081 sizeof(cb->args) - sizeof(cb->args[0]));
1082 if (nf_tables_fill_chain_info(skb, net,
1083 NETLINK_CB(cb->skb).portid,
1084 cb->nlh->nlmsg_seq,
1085 NFT_MSG_NEWCHAIN,
1086 NLM_F_MULTI,
1087 afi->family, table, chain) < 0)
1088 goto done;
1089
1090 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1091 cont:
1092 idx++;
1093 }
1094 }
1095 }
1096 done:
1097 rcu_read_unlock();
1098 cb->args[0] = idx;
1099 return skb->len;
1100 }
1101
1102 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1103 struct sk_buff *skb, const struct nlmsghdr *nlh,
1104 const struct nlattr * const nla[])
1105 {
1106 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1107 const struct nft_af_info *afi;
1108 const struct nft_table *table;
1109 const struct nft_chain *chain;
1110 struct sk_buff *skb2;
1111 int family = nfmsg->nfgen_family;
1112 int err;
1113
1114 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1115 struct netlink_dump_control c = {
1116 .dump = nf_tables_dump_chains,
1117 };
1118 return netlink_dump_start(nlsk, skb, nlh, &c);
1119 }
1120
1121 afi = nf_tables_afinfo_lookup(net, family, false);
1122 if (IS_ERR(afi))
1123 return PTR_ERR(afi);
1124
1125 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1126 if (IS_ERR(table))
1127 return PTR_ERR(table);
1128 if (table->flags & NFT_TABLE_INACTIVE)
1129 return -ENOENT;
1130
1131 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1132 if (IS_ERR(chain))
1133 return PTR_ERR(chain);
1134 if (chain->flags & NFT_CHAIN_INACTIVE)
1135 return -ENOENT;
1136
1137 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1138 if (!skb2)
1139 return -ENOMEM;
1140
1141 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1142 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1143 family, table, chain);
1144 if (err < 0)
1145 goto err;
1146
1147 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1148
1149 err:
1150 kfree_skb(skb2);
1151 return err;
1152 }
1153
1154 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1155 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1156 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1157 };
1158
1159 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1160 {
1161 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1162 struct nft_stats __percpu *newstats;
1163 struct nft_stats *stats;
1164 int err;
1165
1166 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1167 if (err < 0)
1168 return ERR_PTR(err);
1169
1170 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1171 return ERR_PTR(-EINVAL);
1172
1173 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1174 if (newstats == NULL)
1175 return ERR_PTR(-ENOMEM);
1176
1177 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1178 * are not exposed to userspace.
1179 */
1180 preempt_disable();
1181 stats = this_cpu_ptr(newstats);
1182 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1183 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1184 preempt_enable();
1185
1186 return newstats;
1187 }
1188
1189 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1190 struct nft_stats __percpu *newstats)
1191 {
1192 if (newstats == NULL)
1193 return;
1194
1195 if (chain->stats) {
1196 struct nft_stats __percpu *oldstats =
1197 nft_dereference(chain->stats);
1198
1199 rcu_assign_pointer(chain->stats, newstats);
1200 synchronize_rcu();
1201 free_percpu(oldstats);
1202 } else
1203 rcu_assign_pointer(chain->stats, newstats);
1204 }
1205
1206 static void nf_tables_chain_destroy(struct nft_chain *chain)
1207 {
1208 BUG_ON(chain->use > 0);
1209
1210 if (chain->flags & NFT_BASE_CHAIN) {
1211 struct nft_base_chain *basechain = nft_base_chain(chain);
1212
1213 module_put(basechain->type->owner);
1214 free_percpu(basechain->stats);
1215 if (basechain->ops[0].dev != NULL)
1216 dev_put(basechain->ops[0].dev);
1217 kfree(basechain);
1218 } else {
1219 kfree(chain);
1220 }
1221 }
1222
1223 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1224 struct sk_buff *skb, const struct nlmsghdr *nlh,
1225 const struct nlattr * const nla[])
1226 {
1227 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1228 const struct nlattr * uninitialized_var(name);
1229 struct nft_af_info *afi;
1230 struct nft_table *table;
1231 struct nft_chain *chain;
1232 struct nft_base_chain *basechain = NULL;
1233 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1234 int family = nfmsg->nfgen_family;
1235 struct net_device *dev = NULL;
1236 u8 policy = NF_ACCEPT;
1237 u64 handle = 0;
1238 unsigned int i;
1239 struct nft_stats __percpu *stats;
1240 int err;
1241 bool create;
1242 struct nft_ctx ctx;
1243
1244 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1245
1246 afi = nf_tables_afinfo_lookup(net, family, true);
1247 if (IS_ERR(afi))
1248 return PTR_ERR(afi);
1249
1250 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1251 if (IS_ERR(table))
1252 return PTR_ERR(table);
1253
1254 chain = NULL;
1255 name = nla[NFTA_CHAIN_NAME];
1256
1257 if (nla[NFTA_CHAIN_HANDLE]) {
1258 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1259 chain = nf_tables_chain_lookup_byhandle(table, handle);
1260 if (IS_ERR(chain))
1261 return PTR_ERR(chain);
1262 } else {
1263 chain = nf_tables_chain_lookup(table, name);
1264 if (IS_ERR(chain)) {
1265 if (PTR_ERR(chain) != -ENOENT)
1266 return PTR_ERR(chain);
1267 chain = NULL;
1268 }
1269 }
1270
1271 if (nla[NFTA_CHAIN_POLICY]) {
1272 if ((chain != NULL &&
1273 !(chain->flags & NFT_BASE_CHAIN)))
1274 return -EOPNOTSUPP;
1275
1276 if (chain == NULL &&
1277 nla[NFTA_CHAIN_HOOK] == NULL)
1278 return -EOPNOTSUPP;
1279
1280 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1281 switch (policy) {
1282 case NF_DROP:
1283 case NF_ACCEPT:
1284 break;
1285 default:
1286 return -EINVAL;
1287 }
1288 }
1289
1290 if (chain != NULL) {
1291 struct nft_stats *stats = NULL;
1292 struct nft_trans *trans;
1293
1294 if (chain->flags & NFT_CHAIN_INACTIVE)
1295 return -ENOENT;
1296 if (nlh->nlmsg_flags & NLM_F_EXCL)
1297 return -EEXIST;
1298 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1299 return -EOPNOTSUPP;
1300
1301 if (nla[NFTA_CHAIN_HANDLE] && name &&
1302 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
1303 return -EEXIST;
1304
1305 if (nla[NFTA_CHAIN_COUNTERS]) {
1306 if (!(chain->flags & NFT_BASE_CHAIN))
1307 return -EOPNOTSUPP;
1308
1309 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1310 if (IS_ERR(stats))
1311 return PTR_ERR(stats);
1312 }
1313
1314 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1315 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1316 sizeof(struct nft_trans_chain));
1317 if (trans == NULL) {
1318 free_percpu(stats);
1319 return -ENOMEM;
1320 }
1321
1322 nft_trans_chain_stats(trans) = stats;
1323 nft_trans_chain_update(trans) = true;
1324
1325 if (nla[NFTA_CHAIN_POLICY])
1326 nft_trans_chain_policy(trans) = policy;
1327 else
1328 nft_trans_chain_policy(trans) = -1;
1329
1330 if (nla[NFTA_CHAIN_HANDLE] && name) {
1331 nla_strlcpy(nft_trans_chain_name(trans), name,
1332 NFT_CHAIN_MAXNAMELEN);
1333 }
1334 list_add_tail(&trans->list, &net->nft.commit_list);
1335 return 0;
1336 }
1337
1338 if (table->use == UINT_MAX)
1339 return -EOVERFLOW;
1340
1341 if (nla[NFTA_CHAIN_HOOK]) {
1342 const struct nf_chain_type *type;
1343 struct nf_hook_ops *ops;
1344 nf_hookfn *hookfn;
1345 u32 hooknum, priority;
1346
1347 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1348 if (nla[NFTA_CHAIN_TYPE]) {
1349 type = nf_tables_chain_type_lookup(afi,
1350 nla[NFTA_CHAIN_TYPE],
1351 create);
1352 if (IS_ERR(type))
1353 return PTR_ERR(type);
1354 }
1355
1356 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1357 nft_hook_policy);
1358 if (err < 0)
1359 return err;
1360 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1361 ha[NFTA_HOOK_PRIORITY] == NULL)
1362 return -EINVAL;
1363
1364 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1365 if (hooknum >= afi->nhooks)
1366 return -EINVAL;
1367 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1368
1369 if (!(type->hook_mask & (1 << hooknum)))
1370 return -EOPNOTSUPP;
1371 if (!try_module_get(type->owner))
1372 return -ENOENT;
1373 hookfn = type->hooks[hooknum];
1374
1375 if (afi->flags & NFT_AF_NEEDS_DEV) {
1376 char ifname[IFNAMSIZ];
1377
1378 if (!ha[NFTA_HOOK_DEV]) {
1379 module_put(type->owner);
1380 return -EOPNOTSUPP;
1381 }
1382
1383 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1384 dev = dev_get_by_name(net, ifname);
1385 if (!dev) {
1386 module_put(type->owner);
1387 return -ENOENT;
1388 }
1389 } else if (ha[NFTA_HOOK_DEV]) {
1390 module_put(type->owner);
1391 return -EOPNOTSUPP;
1392 }
1393
1394 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1395 if (basechain == NULL) {
1396 module_put(type->owner);
1397 if (dev != NULL)
1398 dev_put(dev);
1399 return -ENOMEM;
1400 }
1401
1402 if (dev != NULL)
1403 strncpy(basechain->dev_name, dev->name, IFNAMSIZ);
1404
1405 if (nla[NFTA_CHAIN_COUNTERS]) {
1406 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1407 if (IS_ERR(stats)) {
1408 module_put(type->owner);
1409 kfree(basechain);
1410 if (dev != NULL)
1411 dev_put(dev);
1412 return PTR_ERR(stats);
1413 }
1414 basechain->stats = stats;
1415 } else {
1416 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1417 if (stats == NULL) {
1418 module_put(type->owner);
1419 kfree(basechain);
1420 if (dev != NULL)
1421 dev_put(dev);
1422 return -ENOMEM;
1423 }
1424 rcu_assign_pointer(basechain->stats, stats);
1425 }
1426
1427 write_pnet(&basechain->pnet, net);
1428 basechain->type = type;
1429 chain = &basechain->chain;
1430
1431 for (i = 0; i < afi->nops; i++) {
1432 ops = &basechain->ops[i];
1433 ops->pf = family;
1434 ops->hooknum = hooknum;
1435 ops->priority = priority;
1436 ops->priv = chain;
1437 ops->hook = afi->hooks[ops->hooknum];
1438 ops->dev = dev;
1439 if (hookfn)
1440 ops->hook = hookfn;
1441 if (afi->hook_ops_init)
1442 afi->hook_ops_init(ops, i);
1443 }
1444
1445 chain->flags |= NFT_BASE_CHAIN;
1446 basechain->policy = policy;
1447 } else {
1448 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1449 if (chain == NULL)
1450 return -ENOMEM;
1451 }
1452
1453 INIT_LIST_HEAD(&chain->rules);
1454 chain->handle = nf_tables_alloc_handle(table);
1455 chain->table = table;
1456 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1457
1458 err = nf_tables_register_hooks(table, chain, afi->nops);
1459 if (err < 0)
1460 goto err1;
1461
1462 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1463 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1464 if (err < 0)
1465 goto err2;
1466
1467 table->use++;
1468 list_add_tail_rcu(&chain->list, &table->chains);
1469 return 0;
1470 err2:
1471 nf_tables_unregister_hooks(table, chain, afi->nops);
1472 err1:
1473 nf_tables_chain_destroy(chain);
1474 return err;
1475 }
1476
1477 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1478 struct sk_buff *skb, const struct nlmsghdr *nlh,
1479 const struct nlattr * const nla[])
1480 {
1481 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1482 struct nft_af_info *afi;
1483 struct nft_table *table;
1484 struct nft_chain *chain;
1485 int family = nfmsg->nfgen_family;
1486 struct nft_ctx ctx;
1487
1488 afi = nf_tables_afinfo_lookup(net, family, false);
1489 if (IS_ERR(afi))
1490 return PTR_ERR(afi);
1491
1492 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1493 if (IS_ERR(table))
1494 return PTR_ERR(table);
1495
1496 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1497 if (IS_ERR(chain))
1498 return PTR_ERR(chain);
1499 if (chain->use > 0)
1500 return -EBUSY;
1501
1502 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1503
1504 return nft_delchain(&ctx);
1505 }
1506
1507 /*
1508 * Expressions
1509 */
1510
1511 /**
1512 * nft_register_expr - register nf_tables expr type
1513 * @ops: expr type
1514 *
1515 * Registers the expr type for use with nf_tables. Returns zero on
1516 * success or a negative errno code otherwise.
1517 */
1518 int nft_register_expr(struct nft_expr_type *type)
1519 {
1520 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1521 if (type->family == NFPROTO_UNSPEC)
1522 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1523 else
1524 list_add_rcu(&type->list, &nf_tables_expressions);
1525 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1526 return 0;
1527 }
1528 EXPORT_SYMBOL_GPL(nft_register_expr);
1529
1530 /**
1531 * nft_unregister_expr - unregister nf_tables expr type
1532 * @ops: expr type
1533 *
1534 * Unregisters the expr typefor use with nf_tables.
1535 */
1536 void nft_unregister_expr(struct nft_expr_type *type)
1537 {
1538 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1539 list_del_rcu(&type->list);
1540 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1541 }
1542 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1543
1544 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1545 struct nlattr *nla)
1546 {
1547 const struct nft_expr_type *type;
1548
1549 list_for_each_entry(type, &nf_tables_expressions, list) {
1550 if (!nla_strcmp(nla, type->name) &&
1551 (!type->family || type->family == family))
1552 return type;
1553 }
1554 return NULL;
1555 }
1556
1557 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1558 struct nlattr *nla)
1559 {
1560 const struct nft_expr_type *type;
1561
1562 if (nla == NULL)
1563 return ERR_PTR(-EINVAL);
1564
1565 type = __nft_expr_type_get(family, nla);
1566 if (type != NULL && try_module_get(type->owner))
1567 return type;
1568
1569 #ifdef CONFIG_MODULES
1570 if (type == NULL) {
1571 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1572 request_module("nft-expr-%u-%.*s", family,
1573 nla_len(nla), (char *)nla_data(nla));
1574 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1575 if (__nft_expr_type_get(family, nla))
1576 return ERR_PTR(-EAGAIN);
1577
1578 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1579 request_module("nft-expr-%.*s",
1580 nla_len(nla), (char *)nla_data(nla));
1581 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1582 if (__nft_expr_type_get(family, nla))
1583 return ERR_PTR(-EAGAIN);
1584 }
1585 #endif
1586 return ERR_PTR(-ENOENT);
1587 }
1588
1589 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1590 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1591 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1592 };
1593
1594 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1595 const struct nft_expr *expr)
1596 {
1597 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1598 goto nla_put_failure;
1599
1600 if (expr->ops->dump) {
1601 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1602 if (data == NULL)
1603 goto nla_put_failure;
1604 if (expr->ops->dump(skb, expr) < 0)
1605 goto nla_put_failure;
1606 nla_nest_end(skb, data);
1607 }
1608
1609 return skb->len;
1610
1611 nla_put_failure:
1612 return -1;
1613 };
1614
1615 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1616 const struct nft_expr *expr)
1617 {
1618 struct nlattr *nest;
1619
1620 nest = nla_nest_start(skb, attr);
1621 if (!nest)
1622 goto nla_put_failure;
1623 if (nf_tables_fill_expr_info(skb, expr) < 0)
1624 goto nla_put_failure;
1625 nla_nest_end(skb, nest);
1626 return 0;
1627
1628 nla_put_failure:
1629 return -1;
1630 }
1631
1632 struct nft_expr_info {
1633 const struct nft_expr_ops *ops;
1634 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1635 };
1636
1637 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1638 const struct nlattr *nla,
1639 struct nft_expr_info *info)
1640 {
1641 const struct nft_expr_type *type;
1642 const struct nft_expr_ops *ops;
1643 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1644 int err;
1645
1646 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1647 if (err < 0)
1648 return err;
1649
1650 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1651 if (IS_ERR(type))
1652 return PTR_ERR(type);
1653
1654 if (tb[NFTA_EXPR_DATA]) {
1655 err = nla_parse_nested(info->tb, type->maxattr,
1656 tb[NFTA_EXPR_DATA], type->policy);
1657 if (err < 0)
1658 goto err1;
1659 } else
1660 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1661
1662 if (type->select_ops != NULL) {
1663 ops = type->select_ops(ctx,
1664 (const struct nlattr * const *)info->tb);
1665 if (IS_ERR(ops)) {
1666 err = PTR_ERR(ops);
1667 goto err1;
1668 }
1669 } else
1670 ops = type->ops;
1671
1672 info->ops = ops;
1673 return 0;
1674
1675 err1:
1676 module_put(type->owner);
1677 return err;
1678 }
1679
1680 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1681 const struct nft_expr_info *info,
1682 struct nft_expr *expr)
1683 {
1684 const struct nft_expr_ops *ops = info->ops;
1685 int err;
1686
1687 expr->ops = ops;
1688 if (ops->init) {
1689 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1690 if (err < 0)
1691 goto err1;
1692 }
1693
1694 return 0;
1695
1696 err1:
1697 expr->ops = NULL;
1698 return err;
1699 }
1700
1701 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1702 struct nft_expr *expr)
1703 {
1704 if (expr->ops->destroy)
1705 expr->ops->destroy(ctx, expr);
1706 module_put(expr->ops->type->owner);
1707 }
1708
1709 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1710 const struct nlattr *nla)
1711 {
1712 struct nft_expr_info info;
1713 struct nft_expr *expr;
1714 int err;
1715
1716 err = nf_tables_expr_parse(ctx, nla, &info);
1717 if (err < 0)
1718 goto err1;
1719
1720 err = -ENOMEM;
1721 expr = kzalloc(info.ops->size, GFP_KERNEL);
1722 if (expr == NULL)
1723 goto err2;
1724
1725 err = nf_tables_newexpr(ctx, &info, expr);
1726 if (err < 0)
1727 goto err3;
1728
1729 return expr;
1730 err3:
1731 kfree(expr);
1732 err2:
1733 module_put(info.ops->type->owner);
1734 err1:
1735 return ERR_PTR(err);
1736 }
1737
1738 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1739 {
1740 nf_tables_expr_destroy(ctx, expr);
1741 kfree(expr);
1742 }
1743
1744 /*
1745 * Rules
1746 */
1747
1748 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1749 u64 handle)
1750 {
1751 struct nft_rule *rule;
1752
1753 // FIXME: this sucks
1754 list_for_each_entry(rule, &chain->rules, list) {
1755 if (handle == rule->handle)
1756 return rule;
1757 }
1758
1759 return ERR_PTR(-ENOENT);
1760 }
1761
1762 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1763 const struct nlattr *nla)
1764 {
1765 if (nla == NULL)
1766 return ERR_PTR(-EINVAL);
1767
1768 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1769 }
1770
1771 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1772 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1773 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1774 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1775 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1776 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1777 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1778 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1779 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1780 .len = NFT_USERDATA_MAXLEN },
1781 };
1782
1783 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1784 u32 portid, u32 seq, int event,
1785 u32 flags, int family,
1786 const struct nft_table *table,
1787 const struct nft_chain *chain,
1788 const struct nft_rule *rule)
1789 {
1790 struct nlmsghdr *nlh;
1791 struct nfgenmsg *nfmsg;
1792 const struct nft_expr *expr, *next;
1793 struct nlattr *list;
1794 const struct nft_rule *prule;
1795 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1796
1797 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1798 flags);
1799 if (nlh == NULL)
1800 goto nla_put_failure;
1801
1802 nfmsg = nlmsg_data(nlh);
1803 nfmsg->nfgen_family = family;
1804 nfmsg->version = NFNETLINK_V0;
1805 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1806
1807 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1808 goto nla_put_failure;
1809 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1810 goto nla_put_failure;
1811 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1812 NFTA_RULE_PAD))
1813 goto nla_put_failure;
1814
1815 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1816 prule = list_entry(rule->list.prev, struct nft_rule, list);
1817 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1818 cpu_to_be64(prule->handle),
1819 NFTA_RULE_PAD))
1820 goto nla_put_failure;
1821 }
1822
1823 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1824 if (list == NULL)
1825 goto nla_put_failure;
1826 nft_rule_for_each_expr(expr, next, rule) {
1827 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
1828 goto nla_put_failure;
1829 }
1830 nla_nest_end(skb, list);
1831
1832 if (rule->udata) {
1833 struct nft_userdata *udata = nft_userdata(rule);
1834 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1835 udata->data) < 0)
1836 goto nla_put_failure;
1837 }
1838
1839 nlmsg_end(skb, nlh);
1840 return 0;
1841
1842 nla_put_failure:
1843 nlmsg_trim(skb, nlh);
1844 return -1;
1845 }
1846
1847 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1848 const struct nft_rule *rule,
1849 int event)
1850 {
1851 struct sk_buff *skb;
1852 int err;
1853
1854 if (!ctx->report &&
1855 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1856 return 0;
1857
1858 err = -ENOBUFS;
1859 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1860 if (skb == NULL)
1861 goto err;
1862
1863 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1864 event, 0, ctx->afi->family, ctx->table,
1865 ctx->chain, rule);
1866 if (err < 0) {
1867 kfree_skb(skb);
1868 goto err;
1869 }
1870
1871 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1872 ctx->report, GFP_KERNEL);
1873 err:
1874 if (err < 0) {
1875 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1876 err);
1877 }
1878 return err;
1879 }
1880
1881 static int nf_tables_dump_rules(struct sk_buff *skb,
1882 struct netlink_callback *cb)
1883 {
1884 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1885 const struct nft_af_info *afi;
1886 const struct nft_table *table;
1887 const struct nft_chain *chain;
1888 const struct nft_rule *rule;
1889 unsigned int idx = 0, s_idx = cb->args[0];
1890 struct net *net = sock_net(skb->sk);
1891 int family = nfmsg->nfgen_family;
1892
1893 rcu_read_lock();
1894 cb->seq = net->nft.base_seq;
1895
1896 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1897 if (family != NFPROTO_UNSPEC && family != afi->family)
1898 continue;
1899
1900 list_for_each_entry_rcu(table, &afi->tables, list) {
1901 list_for_each_entry_rcu(chain, &table->chains, list) {
1902 list_for_each_entry_rcu(rule, &chain->rules, list) {
1903 if (!nft_rule_is_active(net, rule))
1904 goto cont;
1905 if (idx < s_idx)
1906 goto cont;
1907 if (idx > s_idx)
1908 memset(&cb->args[1], 0,
1909 sizeof(cb->args) - sizeof(cb->args[0]));
1910 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
1911 cb->nlh->nlmsg_seq,
1912 NFT_MSG_NEWRULE,
1913 NLM_F_MULTI | NLM_F_APPEND,
1914 afi->family, table, chain, rule) < 0)
1915 goto done;
1916
1917 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1918 cont:
1919 idx++;
1920 }
1921 }
1922 }
1923 }
1924 done:
1925 rcu_read_unlock();
1926
1927 cb->args[0] = idx;
1928 return skb->len;
1929 }
1930
1931 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
1932 struct sk_buff *skb, const struct nlmsghdr *nlh,
1933 const struct nlattr * const nla[])
1934 {
1935 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1936 const struct nft_af_info *afi;
1937 const struct nft_table *table;
1938 const struct nft_chain *chain;
1939 const struct nft_rule *rule;
1940 struct sk_buff *skb2;
1941 int family = nfmsg->nfgen_family;
1942 int err;
1943
1944 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1945 struct netlink_dump_control c = {
1946 .dump = nf_tables_dump_rules,
1947 };
1948 return netlink_dump_start(nlsk, skb, nlh, &c);
1949 }
1950
1951 afi = nf_tables_afinfo_lookup(net, family, false);
1952 if (IS_ERR(afi))
1953 return PTR_ERR(afi);
1954
1955 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1956 if (IS_ERR(table))
1957 return PTR_ERR(table);
1958 if (table->flags & NFT_TABLE_INACTIVE)
1959 return -ENOENT;
1960
1961 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1962 if (IS_ERR(chain))
1963 return PTR_ERR(chain);
1964 if (chain->flags & NFT_CHAIN_INACTIVE)
1965 return -ENOENT;
1966
1967 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1968 if (IS_ERR(rule))
1969 return PTR_ERR(rule);
1970
1971 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1972 if (!skb2)
1973 return -ENOMEM;
1974
1975 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
1976 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1977 family, table, chain, rule);
1978 if (err < 0)
1979 goto err;
1980
1981 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1982
1983 err:
1984 kfree_skb(skb2);
1985 return err;
1986 }
1987
1988 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1989 struct nft_rule *rule)
1990 {
1991 struct nft_expr *expr;
1992
1993 /*
1994 * Careful: some expressions might not be initialized in case this
1995 * is called on error from nf_tables_newrule().
1996 */
1997 expr = nft_expr_first(rule);
1998 while (expr->ops && expr != nft_expr_last(rule)) {
1999 nf_tables_expr_destroy(ctx, expr);
2000 expr = nft_expr_next(expr);
2001 }
2002 kfree(rule);
2003 }
2004
2005 #define NFT_RULE_MAXEXPRS 128
2006
2007 static struct nft_expr_info *info;
2008
2009 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2010 struct sk_buff *skb, const struct nlmsghdr *nlh,
2011 const struct nlattr * const nla[])
2012 {
2013 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2014 struct nft_af_info *afi;
2015 struct nft_table *table;
2016 struct nft_chain *chain;
2017 struct nft_rule *rule, *old_rule = NULL;
2018 struct nft_userdata *udata;
2019 struct nft_trans *trans = NULL;
2020 struct nft_expr *expr;
2021 struct nft_ctx ctx;
2022 struct nlattr *tmp;
2023 unsigned int size, i, n, ulen = 0, usize = 0;
2024 int err, rem;
2025 bool create;
2026 u64 handle, pos_handle;
2027
2028 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2029
2030 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2031 if (IS_ERR(afi))
2032 return PTR_ERR(afi);
2033
2034 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
2035 if (IS_ERR(table))
2036 return PTR_ERR(table);
2037
2038 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2039 if (IS_ERR(chain))
2040 return PTR_ERR(chain);
2041
2042 if (nla[NFTA_RULE_HANDLE]) {
2043 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2044 rule = __nf_tables_rule_lookup(chain, handle);
2045 if (IS_ERR(rule))
2046 return PTR_ERR(rule);
2047
2048 if (nlh->nlmsg_flags & NLM_F_EXCL)
2049 return -EEXIST;
2050 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2051 old_rule = rule;
2052 else
2053 return -EOPNOTSUPP;
2054 } else {
2055 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2056 return -EINVAL;
2057 handle = nf_tables_alloc_handle(table);
2058
2059 if (chain->use == UINT_MAX)
2060 return -EOVERFLOW;
2061 }
2062
2063 if (nla[NFTA_RULE_POSITION]) {
2064 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2065 return -EOPNOTSUPP;
2066
2067 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2068 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2069 if (IS_ERR(old_rule))
2070 return PTR_ERR(old_rule);
2071 }
2072
2073 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2074
2075 n = 0;
2076 size = 0;
2077 if (nla[NFTA_RULE_EXPRESSIONS]) {
2078 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2079 err = -EINVAL;
2080 if (nla_type(tmp) != NFTA_LIST_ELEM)
2081 goto err1;
2082 if (n == NFT_RULE_MAXEXPRS)
2083 goto err1;
2084 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2085 if (err < 0)
2086 goto err1;
2087 size += info[n].ops->size;
2088 n++;
2089 }
2090 }
2091 /* Check for overflow of dlen field */
2092 err = -EFBIG;
2093 if (size >= 1 << 12)
2094 goto err1;
2095
2096 if (nla[NFTA_RULE_USERDATA]) {
2097 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2098 if (ulen > 0)
2099 usize = sizeof(struct nft_userdata) + ulen;
2100 }
2101
2102 err = -ENOMEM;
2103 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2104 if (rule == NULL)
2105 goto err1;
2106
2107 nft_rule_activate_next(net, rule);
2108
2109 rule->handle = handle;
2110 rule->dlen = size;
2111 rule->udata = ulen ? 1 : 0;
2112
2113 if (ulen) {
2114 udata = nft_userdata(rule);
2115 udata->len = ulen - 1;
2116 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2117 }
2118
2119 expr = nft_expr_first(rule);
2120 for (i = 0; i < n; i++) {
2121 err = nf_tables_newexpr(&ctx, &info[i], expr);
2122 if (err < 0)
2123 goto err2;
2124 info[i].ops = NULL;
2125 expr = nft_expr_next(expr);
2126 }
2127
2128 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2129 if (nft_rule_is_active_next(net, old_rule)) {
2130 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2131 old_rule);
2132 if (trans == NULL) {
2133 err = -ENOMEM;
2134 goto err2;
2135 }
2136 nft_rule_deactivate_next(net, old_rule);
2137 chain->use--;
2138 list_add_tail_rcu(&rule->list, &old_rule->list);
2139 } else {
2140 err = -ENOENT;
2141 goto err2;
2142 }
2143 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2144 if (old_rule)
2145 list_add_rcu(&rule->list, &old_rule->list);
2146 else
2147 list_add_tail_rcu(&rule->list, &chain->rules);
2148 else {
2149 if (old_rule)
2150 list_add_tail_rcu(&rule->list, &old_rule->list);
2151 else
2152 list_add_rcu(&rule->list, &chain->rules);
2153 }
2154
2155 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2156 err = -ENOMEM;
2157 goto err3;
2158 }
2159 chain->use++;
2160 return 0;
2161
2162 err3:
2163 list_del_rcu(&rule->list);
2164 err2:
2165 nf_tables_rule_destroy(&ctx, rule);
2166 err1:
2167 for (i = 0; i < n; i++) {
2168 if (info[i].ops != NULL)
2169 module_put(info[i].ops->type->owner);
2170 }
2171 return err;
2172 }
2173
2174 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2175 struct sk_buff *skb, const struct nlmsghdr *nlh,
2176 const struct nlattr * const nla[])
2177 {
2178 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2179 struct nft_af_info *afi;
2180 struct nft_table *table;
2181 struct nft_chain *chain = NULL;
2182 struct nft_rule *rule;
2183 int family = nfmsg->nfgen_family, err = 0;
2184 struct nft_ctx ctx;
2185
2186 afi = nf_tables_afinfo_lookup(net, family, false);
2187 if (IS_ERR(afi))
2188 return PTR_ERR(afi);
2189
2190 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
2191 if (IS_ERR(table))
2192 return PTR_ERR(table);
2193
2194 if (nla[NFTA_RULE_CHAIN]) {
2195 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2196 if (IS_ERR(chain))
2197 return PTR_ERR(chain);
2198 }
2199
2200 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2201
2202 if (chain) {
2203 if (nla[NFTA_RULE_HANDLE]) {
2204 rule = nf_tables_rule_lookup(chain,
2205 nla[NFTA_RULE_HANDLE]);
2206 if (IS_ERR(rule))
2207 return PTR_ERR(rule);
2208
2209 err = nft_delrule(&ctx, rule);
2210 } else {
2211 err = nft_delrule_by_chain(&ctx);
2212 }
2213 } else {
2214 list_for_each_entry(chain, &table->chains, list) {
2215 ctx.chain = chain;
2216 err = nft_delrule_by_chain(&ctx);
2217 if (err < 0)
2218 break;
2219 }
2220 }
2221
2222 return err;
2223 }
2224
2225 /*
2226 * Sets
2227 */
2228
2229 static LIST_HEAD(nf_tables_set_ops);
2230
2231 int nft_register_set(struct nft_set_ops *ops)
2232 {
2233 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2234 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2235 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2236 return 0;
2237 }
2238 EXPORT_SYMBOL_GPL(nft_register_set);
2239
2240 void nft_unregister_set(struct nft_set_ops *ops)
2241 {
2242 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2243 list_del_rcu(&ops->list);
2244 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2245 }
2246 EXPORT_SYMBOL_GPL(nft_unregister_set);
2247
2248 /*
2249 * Select a set implementation based on the data characteristics and the
2250 * given policy. The total memory use might not be known if no size is
2251 * given, in that case the amount of memory per element is used.
2252 */
2253 static const struct nft_set_ops *
2254 nft_select_set_ops(const struct nlattr * const nla[],
2255 const struct nft_set_desc *desc,
2256 enum nft_set_policies policy)
2257 {
2258 const struct nft_set_ops *ops, *bops;
2259 struct nft_set_estimate est, best;
2260 u32 features;
2261
2262 #ifdef CONFIG_MODULES
2263 if (list_empty(&nf_tables_set_ops)) {
2264 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2265 request_module("nft-set");
2266 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2267 if (!list_empty(&nf_tables_set_ops))
2268 return ERR_PTR(-EAGAIN);
2269 }
2270 #endif
2271 features = 0;
2272 if (nla[NFTA_SET_FLAGS] != NULL) {
2273 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2274 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT;
2275 }
2276
2277 bops = NULL;
2278 best.size = ~0;
2279 best.class = ~0;
2280
2281 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2282 if ((ops->features & features) != features)
2283 continue;
2284 if (!ops->estimate(desc, features, &est))
2285 continue;
2286
2287 switch (policy) {
2288 case NFT_SET_POL_PERFORMANCE:
2289 if (est.class < best.class)
2290 break;
2291 if (est.class == best.class && est.size < best.size)
2292 break;
2293 continue;
2294 case NFT_SET_POL_MEMORY:
2295 if (est.size < best.size)
2296 break;
2297 if (est.size == best.size && est.class < best.class)
2298 break;
2299 continue;
2300 default:
2301 break;
2302 }
2303
2304 if (!try_module_get(ops->owner))
2305 continue;
2306 if (bops != NULL)
2307 module_put(bops->owner);
2308
2309 bops = ops;
2310 best = est;
2311 }
2312
2313 if (bops != NULL)
2314 return bops;
2315
2316 return ERR_PTR(-EOPNOTSUPP);
2317 }
2318
2319 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2320 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2321 [NFTA_SET_NAME] = { .type = NLA_STRING,
2322 .len = NFT_SET_MAXNAMELEN - 1 },
2323 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2324 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2325 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2326 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2327 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2328 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2329 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2330 [NFTA_SET_ID] = { .type = NLA_U32 },
2331 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2332 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2333 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2334 .len = NFT_USERDATA_MAXLEN },
2335 };
2336
2337 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2338 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2339 };
2340
2341 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2342 const struct sk_buff *skb,
2343 const struct nlmsghdr *nlh,
2344 const struct nlattr * const nla[])
2345 {
2346 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2347 struct nft_af_info *afi = NULL;
2348 struct nft_table *table = NULL;
2349
2350 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2351 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2352 if (IS_ERR(afi))
2353 return PTR_ERR(afi);
2354 }
2355
2356 if (nla[NFTA_SET_TABLE] != NULL) {
2357 if (afi == NULL)
2358 return -EAFNOSUPPORT;
2359
2360 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2361 if (IS_ERR(table))
2362 return PTR_ERR(table);
2363 }
2364
2365 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
2366 return 0;
2367 }
2368
2369 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2370 const struct nlattr *nla)
2371 {
2372 struct nft_set *set;
2373
2374 if (nla == NULL)
2375 return ERR_PTR(-EINVAL);
2376
2377 list_for_each_entry(set, &table->sets, list) {
2378 if (!nla_strcmp(nla, set->name))
2379 return set;
2380 }
2381 return ERR_PTR(-ENOENT);
2382 }
2383
2384 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2385 const struct nlattr *nla)
2386 {
2387 struct nft_trans *trans;
2388 u32 id = ntohl(nla_get_be32(nla));
2389
2390 list_for_each_entry(trans, &net->nft.commit_list, list) {
2391 if (trans->msg_type == NFT_MSG_NEWSET &&
2392 id == nft_trans_set_id(trans))
2393 return nft_trans_set(trans);
2394 }
2395 return ERR_PTR(-ENOENT);
2396 }
2397
2398 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2399 const char *name)
2400 {
2401 const struct nft_set *i;
2402 const char *p;
2403 unsigned long *inuse;
2404 unsigned int n = 0, min = 0;
2405
2406 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
2407 if (p != NULL) {
2408 if (p[1] != 'd' || strchr(p + 2, '%'))
2409 return -EINVAL;
2410
2411 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2412 if (inuse == NULL)
2413 return -ENOMEM;
2414 cont:
2415 list_for_each_entry(i, &ctx->table->sets, list) {
2416 int tmp;
2417
2418 if (!sscanf(i->name, name, &tmp))
2419 continue;
2420 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2421 continue;
2422
2423 set_bit(tmp - min, inuse);
2424 }
2425
2426 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2427 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2428 min += BITS_PER_BYTE * PAGE_SIZE;
2429 memset(inuse, 0, PAGE_SIZE);
2430 goto cont;
2431 }
2432 free_page((unsigned long)inuse);
2433 }
2434
2435 snprintf(set->name, sizeof(set->name), name, min + n);
2436 list_for_each_entry(i, &ctx->table->sets, list) {
2437 if (!strcmp(set->name, i->name))
2438 return -ENFILE;
2439 }
2440 return 0;
2441 }
2442
2443 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2444 const struct nft_set *set, u16 event, u16 flags)
2445 {
2446 struct nfgenmsg *nfmsg;
2447 struct nlmsghdr *nlh;
2448 struct nlattr *desc;
2449 u32 portid = ctx->portid;
2450 u32 seq = ctx->seq;
2451
2452 event |= NFNL_SUBSYS_NFTABLES << 8;
2453 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2454 flags);
2455 if (nlh == NULL)
2456 goto nla_put_failure;
2457
2458 nfmsg = nlmsg_data(nlh);
2459 nfmsg->nfgen_family = ctx->afi->family;
2460 nfmsg->version = NFNETLINK_V0;
2461 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2462
2463 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2464 goto nla_put_failure;
2465 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2466 goto nla_put_failure;
2467 if (set->flags != 0)
2468 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2469 goto nla_put_failure;
2470
2471 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2472 goto nla_put_failure;
2473 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2474 goto nla_put_failure;
2475 if (set->flags & NFT_SET_MAP) {
2476 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2477 goto nla_put_failure;
2478 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2479 goto nla_put_failure;
2480 }
2481
2482 if (set->timeout &&
2483 nla_put_be64(skb, NFTA_SET_TIMEOUT, cpu_to_be64(set->timeout),
2484 NFTA_SET_PAD))
2485 goto nla_put_failure;
2486 if (set->gc_int &&
2487 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2488 goto nla_put_failure;
2489
2490 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2491 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2492 goto nla_put_failure;
2493 }
2494
2495 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2496 goto nla_put_failure;
2497
2498 desc = nla_nest_start(skb, NFTA_SET_DESC);
2499 if (desc == NULL)
2500 goto nla_put_failure;
2501 if (set->size &&
2502 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2503 goto nla_put_failure;
2504 nla_nest_end(skb, desc);
2505
2506 nlmsg_end(skb, nlh);
2507 return 0;
2508
2509 nla_put_failure:
2510 nlmsg_trim(skb, nlh);
2511 return -1;
2512 }
2513
2514 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2515 const struct nft_set *set,
2516 int event, gfp_t gfp_flags)
2517 {
2518 struct sk_buff *skb;
2519 u32 portid = ctx->portid;
2520 int err;
2521
2522 if (!ctx->report &&
2523 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2524 return 0;
2525
2526 err = -ENOBUFS;
2527 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2528 if (skb == NULL)
2529 goto err;
2530
2531 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2532 if (err < 0) {
2533 kfree_skb(skb);
2534 goto err;
2535 }
2536
2537 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2538 ctx->report, gfp_flags);
2539 err:
2540 if (err < 0)
2541 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2542 return err;
2543 }
2544
2545 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2546 {
2547 const struct nft_set *set;
2548 unsigned int idx, s_idx = cb->args[0];
2549 struct nft_af_info *afi;
2550 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2551 struct net *net = sock_net(skb->sk);
2552 int cur_family = cb->args[3];
2553 struct nft_ctx *ctx = cb->data, ctx_set;
2554
2555 if (cb->args[1])
2556 return skb->len;
2557
2558 rcu_read_lock();
2559 cb->seq = net->nft.base_seq;
2560
2561 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2562 if (ctx->afi && ctx->afi != afi)
2563 continue;
2564
2565 if (cur_family) {
2566 if (afi->family != cur_family)
2567 continue;
2568
2569 cur_family = 0;
2570 }
2571 list_for_each_entry_rcu(table, &afi->tables, list) {
2572 if (ctx->table && ctx->table != table)
2573 continue;
2574
2575 if (cur_table) {
2576 if (cur_table != table)
2577 continue;
2578
2579 cur_table = NULL;
2580 }
2581 idx = 0;
2582 list_for_each_entry_rcu(set, &table->sets, list) {
2583 if (idx < s_idx)
2584 goto cont;
2585
2586 ctx_set = *ctx;
2587 ctx_set.table = table;
2588 ctx_set.afi = afi;
2589 if (nf_tables_fill_set(skb, &ctx_set, set,
2590 NFT_MSG_NEWSET,
2591 NLM_F_MULTI) < 0) {
2592 cb->args[0] = idx;
2593 cb->args[2] = (unsigned long) table;
2594 cb->args[3] = afi->family;
2595 goto done;
2596 }
2597 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2598 cont:
2599 idx++;
2600 }
2601 if (s_idx)
2602 s_idx = 0;
2603 }
2604 }
2605 cb->args[1] = 1;
2606 done:
2607 rcu_read_unlock();
2608 return skb->len;
2609 }
2610
2611 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2612 {
2613 kfree(cb->data);
2614 return 0;
2615 }
2616
2617 static int nf_tables_getset(struct net *net, struct sock *nlsk,
2618 struct sk_buff *skb, const struct nlmsghdr *nlh,
2619 const struct nlattr * const nla[])
2620 {
2621 const struct nft_set *set;
2622 struct nft_ctx ctx;
2623 struct sk_buff *skb2;
2624 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2625 int err;
2626
2627 /* Verify existence before starting dump */
2628 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla);
2629 if (err < 0)
2630 return err;
2631
2632 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2633 struct netlink_dump_control c = {
2634 .dump = nf_tables_dump_sets,
2635 .done = nf_tables_dump_sets_done,
2636 };
2637 struct nft_ctx *ctx_dump;
2638
2639 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2640 if (ctx_dump == NULL)
2641 return -ENOMEM;
2642
2643 *ctx_dump = ctx;
2644 c.data = ctx_dump;
2645
2646 return netlink_dump_start(nlsk, skb, nlh, &c);
2647 }
2648
2649 /* Only accept unspec with dump */
2650 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2651 return -EAFNOSUPPORT;
2652 if (!nla[NFTA_SET_TABLE])
2653 return -EINVAL;
2654
2655 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2656 if (IS_ERR(set))
2657 return PTR_ERR(set);
2658 if (set->flags & NFT_SET_INACTIVE)
2659 return -ENOENT;
2660
2661 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2662 if (skb2 == NULL)
2663 return -ENOMEM;
2664
2665 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2666 if (err < 0)
2667 goto err;
2668
2669 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2670
2671 err:
2672 kfree_skb(skb2);
2673 return err;
2674 }
2675
2676 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2677 struct nft_set_desc *desc,
2678 const struct nlattr *nla)
2679 {
2680 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2681 int err;
2682
2683 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2684 if (err < 0)
2685 return err;
2686
2687 if (da[NFTA_SET_DESC_SIZE] != NULL)
2688 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2689
2690 return 0;
2691 }
2692
2693 static int nf_tables_newset(struct net *net, struct sock *nlsk,
2694 struct sk_buff *skb, const struct nlmsghdr *nlh,
2695 const struct nlattr * const nla[])
2696 {
2697 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2698 const struct nft_set_ops *ops;
2699 struct nft_af_info *afi;
2700 struct nft_table *table;
2701 struct nft_set *set;
2702 struct nft_ctx ctx;
2703 char name[NFT_SET_MAXNAMELEN];
2704 unsigned int size;
2705 bool create;
2706 u64 timeout;
2707 u32 ktype, dtype, flags, policy, gc_int;
2708 struct nft_set_desc desc;
2709 unsigned char *udata;
2710 u16 udlen;
2711 int err;
2712
2713 if (nla[NFTA_SET_TABLE] == NULL ||
2714 nla[NFTA_SET_NAME] == NULL ||
2715 nla[NFTA_SET_KEY_LEN] == NULL ||
2716 nla[NFTA_SET_ID] == NULL)
2717 return -EINVAL;
2718
2719 memset(&desc, 0, sizeof(desc));
2720
2721 ktype = NFT_DATA_VALUE;
2722 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2723 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2724 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2725 return -EINVAL;
2726 }
2727
2728 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2729 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
2730 return -EINVAL;
2731
2732 flags = 0;
2733 if (nla[NFTA_SET_FLAGS] != NULL) {
2734 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2735 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2736 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2737 NFT_SET_MAP | NFT_SET_EVAL))
2738 return -EINVAL;
2739 /* Only one of both operations is supported */
2740 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL)) ==
2741 (NFT_SET_MAP | NFT_SET_EVAL))
2742 return -EOPNOTSUPP;
2743 }
2744
2745 dtype = 0;
2746 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2747 if (!(flags & NFT_SET_MAP))
2748 return -EINVAL;
2749
2750 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2751 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2752 dtype != NFT_DATA_VERDICT)
2753 return -EINVAL;
2754
2755 if (dtype != NFT_DATA_VERDICT) {
2756 if (nla[NFTA_SET_DATA_LEN] == NULL)
2757 return -EINVAL;
2758 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2759 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
2760 return -EINVAL;
2761 } else
2762 desc.dlen = sizeof(struct nft_verdict);
2763 } else if (flags & NFT_SET_MAP)
2764 return -EINVAL;
2765
2766 timeout = 0;
2767 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2768 if (!(flags & NFT_SET_TIMEOUT))
2769 return -EINVAL;
2770 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_TIMEOUT]));
2771 }
2772 gc_int = 0;
2773 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2774 if (!(flags & NFT_SET_TIMEOUT))
2775 return -EINVAL;
2776 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2777 }
2778
2779 policy = NFT_SET_POL_PERFORMANCE;
2780 if (nla[NFTA_SET_POLICY] != NULL)
2781 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2782
2783 if (nla[NFTA_SET_DESC] != NULL) {
2784 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2785 if (err < 0)
2786 return err;
2787 }
2788
2789 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2790
2791 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2792 if (IS_ERR(afi))
2793 return PTR_ERR(afi);
2794
2795 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2796 if (IS_ERR(table))
2797 return PTR_ERR(table);
2798
2799 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
2800
2801 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2802 if (IS_ERR(set)) {
2803 if (PTR_ERR(set) != -ENOENT)
2804 return PTR_ERR(set);
2805 set = NULL;
2806 }
2807
2808 if (set != NULL) {
2809 if (nlh->nlmsg_flags & NLM_F_EXCL)
2810 return -EEXIST;
2811 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2812 return -EOPNOTSUPP;
2813 return 0;
2814 }
2815
2816 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2817 return -ENOENT;
2818
2819 ops = nft_select_set_ops(nla, &desc, policy);
2820 if (IS_ERR(ops))
2821 return PTR_ERR(ops);
2822
2823 udlen = 0;
2824 if (nla[NFTA_SET_USERDATA])
2825 udlen = nla_len(nla[NFTA_SET_USERDATA]);
2826
2827 size = 0;
2828 if (ops->privsize != NULL)
2829 size = ops->privsize(nla);
2830
2831 err = -ENOMEM;
2832 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
2833 if (set == NULL)
2834 goto err1;
2835
2836 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2837 err = nf_tables_set_alloc_name(&ctx, set, name);
2838 if (err < 0)
2839 goto err2;
2840
2841 udata = NULL;
2842 if (udlen) {
2843 udata = set->data + size;
2844 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
2845 }
2846
2847 INIT_LIST_HEAD(&set->bindings);
2848 write_pnet(&set->pnet, net);
2849 set->ops = ops;
2850 set->ktype = ktype;
2851 set->klen = desc.klen;
2852 set->dtype = dtype;
2853 set->dlen = desc.dlen;
2854 set->flags = flags;
2855 set->size = desc.size;
2856 set->policy = policy;
2857 set->udlen = udlen;
2858 set->udata = udata;
2859 set->timeout = timeout;
2860 set->gc_int = gc_int;
2861
2862 err = ops->init(set, &desc, nla);
2863 if (err < 0)
2864 goto err2;
2865
2866 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2867 if (err < 0)
2868 goto err2;
2869
2870 list_add_tail_rcu(&set->list, &table->sets);
2871 table->use++;
2872 return 0;
2873
2874 err2:
2875 kfree(set);
2876 err1:
2877 module_put(ops->owner);
2878 return err;
2879 }
2880
2881 static void nft_set_destroy(struct nft_set *set)
2882 {
2883 set->ops->destroy(set);
2884 module_put(set->ops->owner);
2885 kfree(set);
2886 }
2887
2888 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2889 {
2890 list_del_rcu(&set->list);
2891 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
2892 nft_set_destroy(set);
2893 }
2894
2895 static int nf_tables_delset(struct net *net, struct sock *nlsk,
2896 struct sk_buff *skb, const struct nlmsghdr *nlh,
2897 const struct nlattr * const nla[])
2898 {
2899 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2900 struct nft_set *set;
2901 struct nft_ctx ctx;
2902 int err;
2903
2904 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2905 return -EAFNOSUPPORT;
2906 if (nla[NFTA_SET_TABLE] == NULL)
2907 return -EINVAL;
2908
2909 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla);
2910 if (err < 0)
2911 return err;
2912
2913 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2914 if (IS_ERR(set))
2915 return PTR_ERR(set);
2916 if (!list_empty(&set->bindings))
2917 return -EBUSY;
2918
2919 return nft_delset(&ctx, set);
2920 }
2921
2922 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2923 const struct nft_set *set,
2924 const struct nft_set_iter *iter,
2925 const struct nft_set_elem *elem)
2926 {
2927 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
2928 enum nft_registers dreg;
2929
2930 dreg = nft_type_to_reg(set->dtype);
2931 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
2932 set->dtype == NFT_DATA_VERDICT ?
2933 NFT_DATA_VERDICT : NFT_DATA_VALUE,
2934 set->dlen);
2935 }
2936
2937 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2938 struct nft_set_binding *binding)
2939 {
2940 struct nft_set_binding *i;
2941 struct nft_set_iter iter;
2942
2943 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2944 return -EBUSY;
2945
2946 if (binding->flags & NFT_SET_MAP) {
2947 /* If the set is already bound to the same chain all
2948 * jumps are already validated for that chain.
2949 */
2950 list_for_each_entry(i, &set->bindings, list) {
2951 if (i->flags & NFT_SET_MAP &&
2952 i->chain == binding->chain)
2953 goto bind;
2954 }
2955
2956 iter.genmask = nft_genmask_next(ctx->net);
2957 iter.skip = 0;
2958 iter.count = 0;
2959 iter.err = 0;
2960 iter.fn = nf_tables_bind_check_setelem;
2961
2962 set->ops->walk(ctx, set, &iter);
2963 if (iter.err < 0)
2964 return iter.err;
2965 }
2966 bind:
2967 binding->chain = ctx->chain;
2968 list_add_tail_rcu(&binding->list, &set->bindings);
2969 return 0;
2970 }
2971
2972 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2973 struct nft_set_binding *binding)
2974 {
2975 list_del_rcu(&binding->list);
2976
2977 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2978 !(set->flags & NFT_SET_INACTIVE))
2979 nf_tables_set_destroy(ctx, set);
2980 }
2981
2982 const struct nft_set_ext_type nft_set_ext_types[] = {
2983 [NFT_SET_EXT_KEY] = {
2984 .align = __alignof__(u32),
2985 },
2986 [NFT_SET_EXT_DATA] = {
2987 .align = __alignof__(u32),
2988 },
2989 [NFT_SET_EXT_EXPR] = {
2990 .align = __alignof__(struct nft_expr),
2991 },
2992 [NFT_SET_EXT_FLAGS] = {
2993 .len = sizeof(u8),
2994 .align = __alignof__(u8),
2995 },
2996 [NFT_SET_EXT_TIMEOUT] = {
2997 .len = sizeof(u64),
2998 .align = __alignof__(u64),
2999 },
3000 [NFT_SET_EXT_EXPIRATION] = {
3001 .len = sizeof(unsigned long),
3002 .align = __alignof__(unsigned long),
3003 },
3004 [NFT_SET_EXT_USERDATA] = {
3005 .len = sizeof(struct nft_userdata),
3006 .align = __alignof__(struct nft_userdata),
3007 },
3008 };
3009 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3010
3011 /*
3012 * Set elements
3013 */
3014
3015 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3016 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3017 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3018 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3019 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3020 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3021 .len = NFT_USERDATA_MAXLEN },
3022 };
3023
3024 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3025 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
3026 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
3027 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3028 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3029 };
3030
3031 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3032 const struct sk_buff *skb,
3033 const struct nlmsghdr *nlh,
3034 const struct nlattr * const nla[])
3035 {
3036 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3037 struct nft_af_info *afi;
3038 struct nft_table *table;
3039
3040 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3041 if (IS_ERR(afi))
3042 return PTR_ERR(afi);
3043
3044 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
3045 if (IS_ERR(table))
3046 return PTR_ERR(table);
3047
3048 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
3049 return 0;
3050 }
3051
3052 static int nf_tables_fill_setelem(struct sk_buff *skb,
3053 const struct nft_set *set,
3054 const struct nft_set_elem *elem)
3055 {
3056 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3057 unsigned char *b = skb_tail_pointer(skb);
3058 struct nlattr *nest;
3059
3060 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3061 if (nest == NULL)
3062 goto nla_put_failure;
3063
3064 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3065 NFT_DATA_VALUE, set->klen) < 0)
3066 goto nla_put_failure;
3067
3068 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3069 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3070 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3071 set->dlen) < 0)
3072 goto nla_put_failure;
3073
3074 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3075 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3076 goto nla_put_failure;
3077
3078 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3079 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3080 htonl(*nft_set_ext_flags(ext))))
3081 goto nla_put_failure;
3082
3083 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3084 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3085 cpu_to_be64(*nft_set_ext_timeout(ext)),
3086 NFTA_SET_ELEM_PAD))
3087 goto nla_put_failure;
3088
3089 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3090 unsigned long expires, now = jiffies;
3091
3092 expires = *nft_set_ext_expiration(ext);
3093 if (time_before(now, expires))
3094 expires -= now;
3095 else
3096 expires = 0;
3097
3098 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3099 cpu_to_be64(jiffies_to_msecs(expires)),
3100 NFTA_SET_ELEM_PAD))
3101 goto nla_put_failure;
3102 }
3103
3104 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3105 struct nft_userdata *udata;
3106
3107 udata = nft_set_ext_userdata(ext);
3108 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3109 udata->len + 1, udata->data))
3110 goto nla_put_failure;
3111 }
3112
3113 nla_nest_end(skb, nest);
3114 return 0;
3115
3116 nla_put_failure:
3117 nlmsg_trim(skb, b);
3118 return -EMSGSIZE;
3119 }
3120
3121 struct nft_set_dump_args {
3122 const struct netlink_callback *cb;
3123 struct nft_set_iter iter;
3124 struct sk_buff *skb;
3125 };
3126
3127 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3128 const struct nft_set *set,
3129 const struct nft_set_iter *iter,
3130 const struct nft_set_elem *elem)
3131 {
3132 struct nft_set_dump_args *args;
3133
3134 args = container_of(iter, struct nft_set_dump_args, iter);
3135 return nf_tables_fill_setelem(args->skb, set, elem);
3136 }
3137
3138 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3139 {
3140 struct net *net = sock_net(skb->sk);
3141 const struct nft_set *set;
3142 struct nft_set_dump_args args;
3143 struct nft_ctx ctx;
3144 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3145 struct nfgenmsg *nfmsg;
3146 struct nlmsghdr *nlh;
3147 struct nlattr *nest;
3148 u32 portid, seq;
3149 int event, err;
3150
3151 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3152 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
3153 if (err < 0)
3154 return err;
3155
3156 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
3157 (void *)nla);
3158 if (err < 0)
3159 return err;
3160 if (ctx.table->flags & NFT_TABLE_INACTIVE)
3161 return -ENOENT;
3162
3163 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3164 if (IS_ERR(set))
3165 return PTR_ERR(set);
3166 if (set->flags & NFT_SET_INACTIVE)
3167 return -ENOENT;
3168
3169 event = NFT_MSG_NEWSETELEM;
3170 event |= NFNL_SUBSYS_NFTABLES << 8;
3171 portid = NETLINK_CB(cb->skb).portid;
3172 seq = cb->nlh->nlmsg_seq;
3173
3174 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3175 NLM_F_MULTI);
3176 if (nlh == NULL)
3177 goto nla_put_failure;
3178
3179 nfmsg = nlmsg_data(nlh);
3180 nfmsg->nfgen_family = ctx.afi->family;
3181 nfmsg->version = NFNETLINK_V0;
3182 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
3183
3184 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3185 goto nla_put_failure;
3186 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3187 goto nla_put_failure;
3188
3189 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3190 if (nest == NULL)
3191 goto nla_put_failure;
3192
3193 args.cb = cb;
3194 args.skb = skb;
3195 args.iter.genmask = nft_genmask_cur(ctx.net);
3196 args.iter.skip = cb->args[0];
3197 args.iter.count = 0;
3198 args.iter.err = 0;
3199 args.iter.fn = nf_tables_dump_setelem;
3200 set->ops->walk(&ctx, set, &args.iter);
3201
3202 nla_nest_end(skb, nest);
3203 nlmsg_end(skb, nlh);
3204
3205 if (args.iter.err && args.iter.err != -EMSGSIZE)
3206 return args.iter.err;
3207 if (args.iter.count == cb->args[0])
3208 return 0;
3209
3210 cb->args[0] = args.iter.count;
3211 return skb->len;
3212
3213 nla_put_failure:
3214 return -ENOSPC;
3215 }
3216
3217 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3218 struct sk_buff *skb, const struct nlmsghdr *nlh,
3219 const struct nlattr * const nla[])
3220 {
3221 const struct nft_set *set;
3222 struct nft_ctx ctx;
3223 int err;
3224
3225 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla);
3226 if (err < 0)
3227 return err;
3228 if (ctx.table->flags & NFT_TABLE_INACTIVE)
3229 return -ENOENT;
3230
3231 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3232 if (IS_ERR(set))
3233 return PTR_ERR(set);
3234 if (set->flags & NFT_SET_INACTIVE)
3235 return -ENOENT;
3236
3237 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3238 struct netlink_dump_control c = {
3239 .dump = nf_tables_dump_set,
3240 };
3241 return netlink_dump_start(nlsk, skb, nlh, &c);
3242 }
3243 return -EOPNOTSUPP;
3244 }
3245
3246 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3247 const struct nft_ctx *ctx, u32 seq,
3248 u32 portid, int event, u16 flags,
3249 const struct nft_set *set,
3250 const struct nft_set_elem *elem)
3251 {
3252 struct nfgenmsg *nfmsg;
3253 struct nlmsghdr *nlh;
3254 struct nlattr *nest;
3255 int err;
3256
3257 event |= NFNL_SUBSYS_NFTABLES << 8;
3258 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3259 flags);
3260 if (nlh == NULL)
3261 goto nla_put_failure;
3262
3263 nfmsg = nlmsg_data(nlh);
3264 nfmsg->nfgen_family = ctx->afi->family;
3265 nfmsg->version = NFNETLINK_V0;
3266 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3267
3268 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3269 goto nla_put_failure;
3270 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3271 goto nla_put_failure;
3272
3273 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3274 if (nest == NULL)
3275 goto nla_put_failure;
3276
3277 err = nf_tables_fill_setelem(skb, set, elem);
3278 if (err < 0)
3279 goto nla_put_failure;
3280
3281 nla_nest_end(skb, nest);
3282
3283 nlmsg_end(skb, nlh);
3284 return 0;
3285
3286 nla_put_failure:
3287 nlmsg_trim(skb, nlh);
3288 return -1;
3289 }
3290
3291 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3292 const struct nft_set *set,
3293 const struct nft_set_elem *elem,
3294 int event, u16 flags)
3295 {
3296 struct net *net = ctx->net;
3297 u32 portid = ctx->portid;
3298 struct sk_buff *skb;
3299 int err;
3300
3301 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3302 return 0;
3303
3304 err = -ENOBUFS;
3305 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3306 if (skb == NULL)
3307 goto err;
3308
3309 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3310 set, elem);
3311 if (err < 0) {
3312 kfree_skb(skb);
3313 goto err;
3314 }
3315
3316 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3317 GFP_KERNEL);
3318 err:
3319 if (err < 0)
3320 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3321 return err;
3322 }
3323
3324 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3325 int msg_type,
3326 struct nft_set *set)
3327 {
3328 struct nft_trans *trans;
3329
3330 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3331 if (trans == NULL)
3332 return NULL;
3333
3334 nft_trans_elem_set(trans) = set;
3335 return trans;
3336 }
3337
3338 void *nft_set_elem_init(const struct nft_set *set,
3339 const struct nft_set_ext_tmpl *tmpl,
3340 const u32 *key, const u32 *data,
3341 u64 timeout, gfp_t gfp)
3342 {
3343 struct nft_set_ext *ext;
3344 void *elem;
3345
3346 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3347 if (elem == NULL)
3348 return NULL;
3349
3350 ext = nft_set_elem_ext(set, elem);
3351 nft_set_ext_init(ext, tmpl);
3352
3353 memcpy(nft_set_ext_key(ext), key, set->klen);
3354 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3355 memcpy(nft_set_ext_data(ext), data, set->dlen);
3356 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3357 *nft_set_ext_expiration(ext) =
3358 jiffies + msecs_to_jiffies(timeout);
3359 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3360 *nft_set_ext_timeout(ext) = timeout;
3361
3362 return elem;
3363 }
3364
3365 void nft_set_elem_destroy(const struct nft_set *set, void *elem)
3366 {
3367 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3368
3369 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3370 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3371 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
3372 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3373 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3374
3375 kfree(elem);
3376 }
3377 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3378
3379 static int nft_setelem_parse_flags(const struct nft_set *set,
3380 const struct nlattr *attr, u32 *flags)
3381 {
3382 if (attr == NULL)
3383 return 0;
3384
3385 *flags = ntohl(nla_get_be32(attr));
3386 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3387 return -EINVAL;
3388 if (!(set->flags & NFT_SET_INTERVAL) &&
3389 *flags & NFT_SET_ELEM_INTERVAL_END)
3390 return -EINVAL;
3391
3392 return 0;
3393 }
3394
3395 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3396 const struct nlattr *attr)
3397 {
3398 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3399 struct nft_data_desc d1, d2;
3400 struct nft_set_ext_tmpl tmpl;
3401 struct nft_set_ext *ext;
3402 struct nft_set_elem elem;
3403 struct nft_set_binding *binding;
3404 struct nft_userdata *udata;
3405 struct nft_data data;
3406 enum nft_registers dreg;
3407 struct nft_trans *trans;
3408 u32 flags = 0;
3409 u64 timeout;
3410 u8 ulen;
3411 int err;
3412
3413 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3414 nft_set_elem_policy);
3415 if (err < 0)
3416 return err;
3417
3418 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3419 return -EINVAL;
3420
3421 nft_set_ext_prepare(&tmpl);
3422
3423 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3424 if (err < 0)
3425 return err;
3426 if (flags != 0)
3427 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3428
3429 if (set->flags & NFT_SET_MAP) {
3430 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3431 !(flags & NFT_SET_ELEM_INTERVAL_END))
3432 return -EINVAL;
3433 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3434 flags & NFT_SET_ELEM_INTERVAL_END)
3435 return -EINVAL;
3436 } else {
3437 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3438 return -EINVAL;
3439 }
3440
3441 timeout = 0;
3442 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3443 if (!(set->flags & NFT_SET_TIMEOUT))
3444 return -EINVAL;
3445 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_ELEM_TIMEOUT]));
3446 } else if (set->flags & NFT_SET_TIMEOUT) {
3447 timeout = set->timeout;
3448 }
3449
3450 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3451 nla[NFTA_SET_ELEM_KEY]);
3452 if (err < 0)
3453 goto err1;
3454 err = -EINVAL;
3455 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3456 goto err2;
3457
3458 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3459 if (timeout > 0) {
3460 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3461 if (timeout != set->timeout)
3462 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3463 }
3464
3465 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3466 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3467 nla[NFTA_SET_ELEM_DATA]);
3468 if (err < 0)
3469 goto err2;
3470
3471 err = -EINVAL;
3472 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3473 goto err3;
3474
3475 dreg = nft_type_to_reg(set->dtype);
3476 list_for_each_entry(binding, &set->bindings, list) {
3477 struct nft_ctx bind_ctx = {
3478 .afi = ctx->afi,
3479 .table = ctx->table,
3480 .chain = (struct nft_chain *)binding->chain,
3481 };
3482
3483 if (!(binding->flags & NFT_SET_MAP))
3484 continue;
3485
3486 err = nft_validate_register_store(&bind_ctx, dreg,
3487 &data,
3488 d2.type, d2.len);
3489 if (err < 0)
3490 goto err3;
3491 }
3492
3493 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
3494 }
3495
3496 /* The full maximum length of userdata can exceed the maximum
3497 * offset value (U8_MAX) for following extensions, therefor it
3498 * must be the last extension added.
3499 */
3500 ulen = 0;
3501 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3502 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3503 if (ulen > 0)
3504 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3505 ulen);
3506 }
3507
3508 err = -ENOMEM;
3509 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
3510 timeout, GFP_KERNEL);
3511 if (elem.priv == NULL)
3512 goto err3;
3513
3514 ext = nft_set_elem_ext(set, elem.priv);
3515 if (flags)
3516 *nft_set_ext_flags(ext) = flags;
3517 if (ulen > 0) {
3518 udata = nft_set_ext_userdata(ext);
3519 udata->len = ulen - 1;
3520 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3521 }
3522
3523 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3524 if (trans == NULL)
3525 goto err4;
3526
3527 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
3528 err = set->ops->insert(set, &elem);
3529 if (err < 0)
3530 goto err5;
3531
3532 nft_trans_elem(trans) = elem;
3533 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3534 return 0;
3535
3536 err5:
3537 kfree(trans);
3538 err4:
3539 kfree(elem.priv);
3540 err3:
3541 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3542 nft_data_uninit(&data, d2.type);
3543 err2:
3544 nft_data_uninit(&elem.key.val, d1.type);
3545 err1:
3546 return err;
3547 }
3548
3549 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3550 struct sk_buff *skb, const struct nlmsghdr *nlh,
3551 const struct nlattr * const nla[])
3552 {
3553 const struct nlattr *attr;
3554 struct nft_set *set;
3555 struct nft_ctx ctx;
3556 int rem, err = 0;
3557
3558 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3559 return -EINVAL;
3560
3561 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla);
3562 if (err < 0)
3563 return err;
3564
3565 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3566 if (IS_ERR(set)) {
3567 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3568 set = nf_tables_set_lookup_byid(net,
3569 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3570 }
3571 if (IS_ERR(set))
3572 return PTR_ERR(set);
3573 }
3574
3575 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3576 return -EBUSY;
3577
3578 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3579 if (set->size &&
3580 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact))
3581 return -ENFILE;
3582
3583 err = nft_add_set_elem(&ctx, set, attr);
3584 if (err < 0) {
3585 atomic_dec(&set->nelems);
3586 break;
3587 }
3588 }
3589 return err;
3590 }
3591
3592 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3593 const struct nlattr *attr)
3594 {
3595 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3596 struct nft_set_ext_tmpl tmpl;
3597 struct nft_data_desc desc;
3598 struct nft_set_elem elem;
3599 struct nft_set_ext *ext;
3600 struct nft_trans *trans;
3601 u32 flags = 0;
3602 void *priv;
3603 int err;
3604
3605 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3606 nft_set_elem_policy);
3607 if (err < 0)
3608 goto err1;
3609
3610 err = -EINVAL;
3611 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3612 goto err1;
3613
3614 nft_set_ext_prepare(&tmpl);
3615
3616 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3617 if (err < 0)
3618 return err;
3619 if (flags != 0)
3620 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3621
3622 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3623 nla[NFTA_SET_ELEM_KEY]);
3624 if (err < 0)
3625 goto err1;
3626
3627 err = -EINVAL;
3628 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3629 goto err2;
3630
3631 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3632
3633 err = -ENOMEM;
3634 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3635 GFP_KERNEL);
3636 if (elem.priv == NULL)
3637 goto err2;
3638
3639 ext = nft_set_elem_ext(set, elem.priv);
3640 if (flags)
3641 *nft_set_ext_flags(ext) = flags;
3642
3643 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3644 if (trans == NULL) {
3645 err = -ENOMEM;
3646 goto err3;
3647 }
3648
3649 priv = set->ops->deactivate(set, &elem);
3650 if (priv == NULL) {
3651 err = -ENOENT;
3652 goto err4;
3653 }
3654 kfree(elem.priv);
3655 elem.priv = priv;
3656
3657 nft_trans_elem(trans) = elem;
3658 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3659 return 0;
3660
3661 err4:
3662 kfree(trans);
3663 err3:
3664 kfree(elem.priv);
3665 err2:
3666 nft_data_uninit(&elem.key.val, desc.type);
3667 err1:
3668 return err;
3669 }
3670
3671 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3672 struct sk_buff *skb, const struct nlmsghdr *nlh,
3673 const struct nlattr * const nla[])
3674 {
3675 const struct nlattr *attr;
3676 struct nft_set *set;
3677 struct nft_ctx ctx;
3678 int rem, err = 0;
3679
3680 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3681 return -EINVAL;
3682
3683 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla);
3684 if (err < 0)
3685 return err;
3686
3687 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3688 if (IS_ERR(set))
3689 return PTR_ERR(set);
3690 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3691 return -EBUSY;
3692
3693 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3694 err = nft_del_setelem(&ctx, set, attr);
3695 if (err < 0)
3696 break;
3697
3698 set->ndeact++;
3699 }
3700 return err;
3701 }
3702
3703 void nft_set_gc_batch_release(struct rcu_head *rcu)
3704 {
3705 struct nft_set_gc_batch *gcb;
3706 unsigned int i;
3707
3708 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
3709 for (i = 0; i < gcb->head.cnt; i++)
3710 nft_set_elem_destroy(gcb->head.set, gcb->elems[i]);
3711 kfree(gcb);
3712 }
3713 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
3714
3715 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
3716 gfp_t gfp)
3717 {
3718 struct nft_set_gc_batch *gcb;
3719
3720 gcb = kzalloc(sizeof(*gcb), gfp);
3721 if (gcb == NULL)
3722 return gcb;
3723 gcb->head.set = set;
3724 return gcb;
3725 }
3726 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
3727
3728 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
3729 u32 portid, u32 seq)
3730 {
3731 struct nlmsghdr *nlh;
3732 struct nfgenmsg *nfmsg;
3733 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
3734
3735 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
3736 if (nlh == NULL)
3737 goto nla_put_failure;
3738
3739 nfmsg = nlmsg_data(nlh);
3740 nfmsg->nfgen_family = AF_UNSPEC;
3741 nfmsg->version = NFNETLINK_V0;
3742 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3743
3744 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
3745 goto nla_put_failure;
3746
3747 nlmsg_end(skb, nlh);
3748 return 0;
3749
3750 nla_put_failure:
3751 nlmsg_trim(skb, nlh);
3752 return -EMSGSIZE;
3753 }
3754
3755 static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
3756 {
3757 struct nlmsghdr *nlh = nlmsg_hdr(skb);
3758 struct sk_buff *skb2;
3759 int err;
3760
3761 if (nlmsg_report(nlh) &&
3762 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3763 return 0;
3764
3765 err = -ENOBUFS;
3766 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3767 if (skb2 == NULL)
3768 goto err;
3769
3770 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3771 nlh->nlmsg_seq);
3772 if (err < 0) {
3773 kfree_skb(skb2);
3774 goto err;
3775 }
3776
3777 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
3778 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
3779 err:
3780 if (err < 0) {
3781 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
3782 err);
3783 }
3784 return err;
3785 }
3786
3787 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
3788 struct sk_buff *skb, const struct nlmsghdr *nlh,
3789 const struct nlattr * const nla[])
3790 {
3791 struct sk_buff *skb2;
3792 int err;
3793
3794 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3795 if (skb2 == NULL)
3796 return -ENOMEM;
3797
3798 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3799 nlh->nlmsg_seq);
3800 if (err < 0)
3801 goto err;
3802
3803 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3804 err:
3805 kfree_skb(skb2);
3806 return err;
3807 }
3808
3809 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3810 [NFT_MSG_NEWTABLE] = {
3811 .call_batch = nf_tables_newtable,
3812 .attr_count = NFTA_TABLE_MAX,
3813 .policy = nft_table_policy,
3814 },
3815 [NFT_MSG_GETTABLE] = {
3816 .call = nf_tables_gettable,
3817 .attr_count = NFTA_TABLE_MAX,
3818 .policy = nft_table_policy,
3819 },
3820 [NFT_MSG_DELTABLE] = {
3821 .call_batch = nf_tables_deltable,
3822 .attr_count = NFTA_TABLE_MAX,
3823 .policy = nft_table_policy,
3824 },
3825 [NFT_MSG_NEWCHAIN] = {
3826 .call_batch = nf_tables_newchain,
3827 .attr_count = NFTA_CHAIN_MAX,
3828 .policy = nft_chain_policy,
3829 },
3830 [NFT_MSG_GETCHAIN] = {
3831 .call = nf_tables_getchain,
3832 .attr_count = NFTA_CHAIN_MAX,
3833 .policy = nft_chain_policy,
3834 },
3835 [NFT_MSG_DELCHAIN] = {
3836 .call_batch = nf_tables_delchain,
3837 .attr_count = NFTA_CHAIN_MAX,
3838 .policy = nft_chain_policy,
3839 },
3840 [NFT_MSG_NEWRULE] = {
3841 .call_batch = nf_tables_newrule,
3842 .attr_count = NFTA_RULE_MAX,
3843 .policy = nft_rule_policy,
3844 },
3845 [NFT_MSG_GETRULE] = {
3846 .call = nf_tables_getrule,
3847 .attr_count = NFTA_RULE_MAX,
3848 .policy = nft_rule_policy,
3849 },
3850 [NFT_MSG_DELRULE] = {
3851 .call_batch = nf_tables_delrule,
3852 .attr_count = NFTA_RULE_MAX,
3853 .policy = nft_rule_policy,
3854 },
3855 [NFT_MSG_NEWSET] = {
3856 .call_batch = nf_tables_newset,
3857 .attr_count = NFTA_SET_MAX,
3858 .policy = nft_set_policy,
3859 },
3860 [NFT_MSG_GETSET] = {
3861 .call = nf_tables_getset,
3862 .attr_count = NFTA_SET_MAX,
3863 .policy = nft_set_policy,
3864 },
3865 [NFT_MSG_DELSET] = {
3866 .call_batch = nf_tables_delset,
3867 .attr_count = NFTA_SET_MAX,
3868 .policy = nft_set_policy,
3869 },
3870 [NFT_MSG_NEWSETELEM] = {
3871 .call_batch = nf_tables_newsetelem,
3872 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3873 .policy = nft_set_elem_list_policy,
3874 },
3875 [NFT_MSG_GETSETELEM] = {
3876 .call = nf_tables_getsetelem,
3877 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3878 .policy = nft_set_elem_list_policy,
3879 },
3880 [NFT_MSG_DELSETELEM] = {
3881 .call_batch = nf_tables_delsetelem,
3882 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3883 .policy = nft_set_elem_list_policy,
3884 },
3885 [NFT_MSG_GETGEN] = {
3886 .call = nf_tables_getgen,
3887 },
3888 };
3889
3890 static void nft_chain_commit_update(struct nft_trans *trans)
3891 {
3892 struct nft_base_chain *basechain;
3893
3894 if (nft_trans_chain_name(trans)[0])
3895 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3896
3897 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3898 return;
3899
3900 basechain = nft_base_chain(trans->ctx.chain);
3901 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3902
3903 switch (nft_trans_chain_policy(trans)) {
3904 case NF_DROP:
3905 case NF_ACCEPT:
3906 basechain->policy = nft_trans_chain_policy(trans);
3907 break;
3908 }
3909 }
3910
3911 static void nf_tables_commit_release(struct nft_trans *trans)
3912 {
3913 switch (trans->msg_type) {
3914 case NFT_MSG_DELTABLE:
3915 nf_tables_table_destroy(&trans->ctx);
3916 break;
3917 case NFT_MSG_DELCHAIN:
3918 nf_tables_chain_destroy(trans->ctx.chain);
3919 break;
3920 case NFT_MSG_DELRULE:
3921 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3922 break;
3923 case NFT_MSG_DELSET:
3924 nft_set_destroy(nft_trans_set(trans));
3925 break;
3926 case NFT_MSG_DELSETELEM:
3927 nft_set_elem_destroy(nft_trans_elem_set(trans),
3928 nft_trans_elem(trans).priv);
3929 break;
3930 }
3931 kfree(trans);
3932 }
3933
3934 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
3935 {
3936 struct nft_trans *trans, *next;
3937 struct nft_trans_elem *te;
3938
3939 /* Bump generation counter, invalidate any dump in progress */
3940 while (++net->nft.base_seq == 0);
3941
3942 /* A new generation has just started */
3943 net->nft.gencursor = nft_gencursor_next(net);
3944
3945 /* Make sure all packets have left the previous generation before
3946 * purging old rules.
3947 */
3948 synchronize_rcu();
3949
3950 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3951 switch (trans->msg_type) {
3952 case NFT_MSG_NEWTABLE:
3953 if (nft_trans_table_update(trans)) {
3954 if (!nft_trans_table_enable(trans)) {
3955 nf_tables_table_disable(trans->ctx.afi,
3956 trans->ctx.table);
3957 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3958 }
3959 } else {
3960 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3961 }
3962 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
3963 nft_trans_destroy(trans);
3964 break;
3965 case NFT_MSG_DELTABLE:
3966 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
3967 break;
3968 case NFT_MSG_NEWCHAIN:
3969 if (nft_trans_chain_update(trans))
3970 nft_chain_commit_update(trans);
3971 else
3972 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
3973
3974 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
3975 nft_trans_destroy(trans);
3976 break;
3977 case NFT_MSG_DELCHAIN:
3978 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
3979 nf_tables_unregister_hooks(trans->ctx.table,
3980 trans->ctx.chain,
3981 trans->ctx.afi->nops);
3982 break;
3983 case NFT_MSG_NEWRULE:
3984 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3985 nf_tables_rule_notify(&trans->ctx,
3986 nft_trans_rule(trans),
3987 NFT_MSG_NEWRULE);
3988 nft_trans_destroy(trans);
3989 break;
3990 case NFT_MSG_DELRULE:
3991 list_del_rcu(&nft_trans_rule(trans)->list);
3992 nf_tables_rule_notify(&trans->ctx,
3993 nft_trans_rule(trans),
3994 NFT_MSG_DELRULE);
3995 break;
3996 case NFT_MSG_NEWSET:
3997 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
3998 /* This avoids hitting -EBUSY when deleting the table
3999 * from the transaction.
4000 */
4001 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4002 !list_empty(&nft_trans_set(trans)->bindings))
4003 trans->ctx.table->use--;
4004
4005 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4006 NFT_MSG_NEWSET, GFP_KERNEL);
4007 nft_trans_destroy(trans);
4008 break;
4009 case NFT_MSG_DELSET:
4010 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4011 NFT_MSG_DELSET, GFP_KERNEL);
4012 break;
4013 case NFT_MSG_NEWSETELEM:
4014 te = (struct nft_trans_elem *)trans->data;
4015
4016 te->set->ops->activate(te->set, &te->elem);
4017 nf_tables_setelem_notify(&trans->ctx, te->set,
4018 &te->elem,
4019 NFT_MSG_NEWSETELEM, 0);
4020 nft_trans_destroy(trans);
4021 break;
4022 case NFT_MSG_DELSETELEM:
4023 te = (struct nft_trans_elem *)trans->data;
4024
4025 nf_tables_setelem_notify(&trans->ctx, te->set,
4026 &te->elem,
4027 NFT_MSG_DELSETELEM, 0);
4028 te->set->ops->remove(te->set, &te->elem);
4029 atomic_dec(&te->set->nelems);
4030 te->set->ndeact--;
4031 break;
4032 }
4033 }
4034
4035 synchronize_rcu();
4036
4037 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4038 list_del(&trans->list);
4039 nf_tables_commit_release(trans);
4040 }
4041
4042 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
4043
4044 return 0;
4045 }
4046
4047 static void nf_tables_abort_release(struct nft_trans *trans)
4048 {
4049 switch (trans->msg_type) {
4050 case NFT_MSG_NEWTABLE:
4051 nf_tables_table_destroy(&trans->ctx);
4052 break;
4053 case NFT_MSG_NEWCHAIN:
4054 nf_tables_chain_destroy(trans->ctx.chain);
4055 break;
4056 case NFT_MSG_NEWRULE:
4057 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4058 break;
4059 case NFT_MSG_NEWSET:
4060 nft_set_destroy(nft_trans_set(trans));
4061 break;
4062 case NFT_MSG_NEWSETELEM:
4063 nft_set_elem_destroy(nft_trans_elem_set(trans),
4064 nft_trans_elem(trans).priv);
4065 break;
4066 }
4067 kfree(trans);
4068 }
4069
4070 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
4071 {
4072 struct nft_trans *trans, *next;
4073 struct nft_trans_elem *te;
4074
4075 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4076 list) {
4077 switch (trans->msg_type) {
4078 case NFT_MSG_NEWTABLE:
4079 if (nft_trans_table_update(trans)) {
4080 if (nft_trans_table_enable(trans)) {
4081 nf_tables_table_disable(trans->ctx.afi,
4082 trans->ctx.table);
4083 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4084 }
4085 nft_trans_destroy(trans);
4086 } else {
4087 list_del_rcu(&trans->ctx.table->list);
4088 }
4089 break;
4090 case NFT_MSG_DELTABLE:
4091 list_add_tail_rcu(&trans->ctx.table->list,
4092 &trans->ctx.afi->tables);
4093 nft_trans_destroy(trans);
4094 break;
4095 case NFT_MSG_NEWCHAIN:
4096 if (nft_trans_chain_update(trans)) {
4097 free_percpu(nft_trans_chain_stats(trans));
4098
4099 nft_trans_destroy(trans);
4100 } else {
4101 trans->ctx.table->use--;
4102 list_del_rcu(&trans->ctx.chain->list);
4103 nf_tables_unregister_hooks(trans->ctx.table,
4104 trans->ctx.chain,
4105 trans->ctx.afi->nops);
4106 }
4107 break;
4108 case NFT_MSG_DELCHAIN:
4109 trans->ctx.table->use++;
4110 list_add_tail_rcu(&trans->ctx.chain->list,
4111 &trans->ctx.table->chains);
4112 nft_trans_destroy(trans);
4113 break;
4114 case NFT_MSG_NEWRULE:
4115 trans->ctx.chain->use--;
4116 list_del_rcu(&nft_trans_rule(trans)->list);
4117 break;
4118 case NFT_MSG_DELRULE:
4119 trans->ctx.chain->use++;
4120 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
4121 nft_trans_destroy(trans);
4122 break;
4123 case NFT_MSG_NEWSET:
4124 trans->ctx.table->use--;
4125 list_del_rcu(&nft_trans_set(trans)->list);
4126 break;
4127 case NFT_MSG_DELSET:
4128 trans->ctx.table->use++;
4129 list_add_tail_rcu(&nft_trans_set(trans)->list,
4130 &trans->ctx.table->sets);
4131 nft_trans_destroy(trans);
4132 break;
4133 case NFT_MSG_NEWSETELEM:
4134 te = (struct nft_trans_elem *)trans->data;
4135
4136 te->set->ops->remove(te->set, &te->elem);
4137 atomic_dec(&te->set->nelems);
4138 break;
4139 case NFT_MSG_DELSETELEM:
4140 te = (struct nft_trans_elem *)trans->data;
4141
4142 te->set->ops->activate(te->set, &te->elem);
4143 te->set->ndeact--;
4144
4145 nft_trans_destroy(trans);
4146 break;
4147 }
4148 }
4149
4150 synchronize_rcu();
4151
4152 list_for_each_entry_safe_reverse(trans, next,
4153 &net->nft.commit_list, list) {
4154 list_del(&trans->list);
4155 nf_tables_abort_release(trans);
4156 }
4157
4158 return 0;
4159 }
4160
4161 static const struct nfnetlink_subsystem nf_tables_subsys = {
4162 .name = "nf_tables",
4163 .subsys_id = NFNL_SUBSYS_NFTABLES,
4164 .cb_count = NFT_MSG_MAX,
4165 .cb = nf_tables_cb,
4166 .commit = nf_tables_commit,
4167 .abort = nf_tables_abort,
4168 };
4169
4170 int nft_chain_validate_dependency(const struct nft_chain *chain,
4171 enum nft_chain_type type)
4172 {
4173 const struct nft_base_chain *basechain;
4174
4175 if (chain->flags & NFT_BASE_CHAIN) {
4176 basechain = nft_base_chain(chain);
4177 if (basechain->type->type != type)
4178 return -EOPNOTSUPP;
4179 }
4180 return 0;
4181 }
4182 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
4183
4184 int nft_chain_validate_hooks(const struct nft_chain *chain,
4185 unsigned int hook_flags)
4186 {
4187 struct nft_base_chain *basechain;
4188
4189 if (chain->flags & NFT_BASE_CHAIN) {
4190 basechain = nft_base_chain(chain);
4191
4192 if ((1 << basechain->ops[0].hooknum) & hook_flags)
4193 return 0;
4194
4195 return -EOPNOTSUPP;
4196 }
4197
4198 return 0;
4199 }
4200 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
4201
4202 /*
4203 * Loop detection - walk through the ruleset beginning at the destination chain
4204 * of a new jump until either the source chain is reached (loop) or all
4205 * reachable chains have been traversed.
4206 *
4207 * The loop check is performed whenever a new jump verdict is added to an
4208 * expression or verdict map or a verdict map is bound to a new chain.
4209 */
4210
4211 static int nf_tables_check_loops(const struct nft_ctx *ctx,
4212 const struct nft_chain *chain);
4213
4214 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
4215 const struct nft_set *set,
4216 const struct nft_set_iter *iter,
4217 const struct nft_set_elem *elem)
4218 {
4219 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4220 const struct nft_data *data;
4221
4222 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4223 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
4224 return 0;
4225
4226 data = nft_set_ext_data(ext);
4227 switch (data->verdict.code) {
4228 case NFT_JUMP:
4229 case NFT_GOTO:
4230 return nf_tables_check_loops(ctx, data->verdict.chain);
4231 default:
4232 return 0;
4233 }
4234 }
4235
4236 static int nf_tables_check_loops(const struct nft_ctx *ctx,
4237 const struct nft_chain *chain)
4238 {
4239 const struct nft_rule *rule;
4240 const struct nft_expr *expr, *last;
4241 const struct nft_set *set;
4242 struct nft_set_binding *binding;
4243 struct nft_set_iter iter;
4244
4245 if (ctx->chain == chain)
4246 return -ELOOP;
4247
4248 list_for_each_entry(rule, &chain->rules, list) {
4249 nft_rule_for_each_expr(expr, last, rule) {
4250 const struct nft_data *data = NULL;
4251 int err;
4252
4253 if (!expr->ops->validate)
4254 continue;
4255
4256 err = expr->ops->validate(ctx, expr, &data);
4257 if (err < 0)
4258 return err;
4259
4260 if (data == NULL)
4261 continue;
4262
4263 switch (data->verdict.code) {
4264 case NFT_JUMP:
4265 case NFT_GOTO:
4266 err = nf_tables_check_loops(ctx,
4267 data->verdict.chain);
4268 if (err < 0)
4269 return err;
4270 default:
4271 break;
4272 }
4273 }
4274 }
4275
4276 list_for_each_entry(set, &ctx->table->sets, list) {
4277 if (!(set->flags & NFT_SET_MAP) ||
4278 set->dtype != NFT_DATA_VERDICT)
4279 continue;
4280
4281 list_for_each_entry(binding, &set->bindings, list) {
4282 if (!(binding->flags & NFT_SET_MAP) ||
4283 binding->chain != chain)
4284 continue;
4285
4286 iter.genmask = nft_genmask_next(ctx->net);
4287 iter.skip = 0;
4288 iter.count = 0;
4289 iter.err = 0;
4290 iter.fn = nf_tables_loop_check_setelem;
4291
4292 set->ops->walk(ctx, set, &iter);
4293 if (iter.err < 0)
4294 return iter.err;
4295 }
4296 }
4297
4298 return 0;
4299 }
4300
4301 /**
4302 * nft_parse_register - parse a register value from a netlink attribute
4303 *
4304 * @attr: netlink attribute
4305 *
4306 * Parse and translate a register value from a netlink attribute.
4307 * Registers used to be 128 bit wide, these register numbers will be
4308 * mapped to the corresponding 32 bit register numbers.
4309 */
4310 unsigned int nft_parse_register(const struct nlattr *attr)
4311 {
4312 unsigned int reg;
4313
4314 reg = ntohl(nla_get_be32(attr));
4315 switch (reg) {
4316 case NFT_REG_VERDICT...NFT_REG_4:
4317 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
4318 default:
4319 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
4320 }
4321 }
4322 EXPORT_SYMBOL_GPL(nft_parse_register);
4323
4324 /**
4325 * nft_dump_register - dump a register value to a netlink attribute
4326 *
4327 * @skb: socket buffer
4328 * @attr: attribute number
4329 * @reg: register number
4330 *
4331 * Construct a netlink attribute containing the register number. For
4332 * compatibility reasons, register numbers being a multiple of 4 are
4333 * translated to the corresponding 128 bit register numbers.
4334 */
4335 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
4336 {
4337 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
4338 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
4339 else
4340 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
4341
4342 return nla_put_be32(skb, attr, htonl(reg));
4343 }
4344 EXPORT_SYMBOL_GPL(nft_dump_register);
4345
4346 /**
4347 * nft_validate_register_load - validate a load from a register
4348 *
4349 * @reg: the register number
4350 * @len: the length of the data
4351 *
4352 * Validate that the input register is one of the general purpose
4353 * registers and that the length of the load is within the bounds.
4354 */
4355 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
4356 {
4357 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
4358 return -EINVAL;
4359 if (len == 0)
4360 return -EINVAL;
4361 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
4362 return -ERANGE;
4363
4364 return 0;
4365 }
4366 EXPORT_SYMBOL_GPL(nft_validate_register_load);
4367
4368 /**
4369 * nft_validate_register_store - validate an expressions' register store
4370 *
4371 * @ctx: context of the expression performing the load
4372 * @reg: the destination register number
4373 * @data: the data to load
4374 * @type: the data type
4375 * @len: the length of the data
4376 *
4377 * Validate that a data load uses the appropriate data type for
4378 * the destination register and the length is within the bounds.
4379 * A value of NULL for the data means that its runtime gathered
4380 * data.
4381 */
4382 int nft_validate_register_store(const struct nft_ctx *ctx,
4383 enum nft_registers reg,
4384 const struct nft_data *data,
4385 enum nft_data_types type, unsigned int len)
4386 {
4387 int err;
4388
4389 switch (reg) {
4390 case NFT_REG_VERDICT:
4391 if (type != NFT_DATA_VERDICT)
4392 return -EINVAL;
4393
4394 if (data != NULL &&
4395 (data->verdict.code == NFT_GOTO ||
4396 data->verdict.code == NFT_JUMP)) {
4397 err = nf_tables_check_loops(ctx, data->verdict.chain);
4398 if (err < 0)
4399 return err;
4400
4401 if (ctx->chain->level + 1 >
4402 data->verdict.chain->level) {
4403 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
4404 return -EMLINK;
4405 data->verdict.chain->level = ctx->chain->level + 1;
4406 }
4407 }
4408
4409 return 0;
4410 default:
4411 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
4412 return -EINVAL;
4413 if (len == 0)
4414 return -EINVAL;
4415 if (reg * NFT_REG32_SIZE + len >
4416 FIELD_SIZEOF(struct nft_regs, data))
4417 return -ERANGE;
4418
4419 if (data != NULL && type != NFT_DATA_VALUE)
4420 return -EINVAL;
4421 return 0;
4422 }
4423 }
4424 EXPORT_SYMBOL_GPL(nft_validate_register_store);
4425
4426 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
4427 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
4428 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
4429 .len = NFT_CHAIN_MAXNAMELEN - 1 },
4430 };
4431
4432 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
4433 struct nft_data_desc *desc, const struct nlattr *nla)
4434 {
4435 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
4436 struct nft_chain *chain;
4437 int err;
4438
4439 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
4440 if (err < 0)
4441 return err;
4442
4443 if (!tb[NFTA_VERDICT_CODE])
4444 return -EINVAL;
4445 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
4446
4447 switch (data->verdict.code) {
4448 default:
4449 switch (data->verdict.code & NF_VERDICT_MASK) {
4450 case NF_ACCEPT:
4451 case NF_DROP:
4452 case NF_QUEUE:
4453 break;
4454 default:
4455 return -EINVAL;
4456 }
4457 /* fall through */
4458 case NFT_CONTINUE:
4459 case NFT_BREAK:
4460 case NFT_RETURN:
4461 break;
4462 case NFT_JUMP:
4463 case NFT_GOTO:
4464 if (!tb[NFTA_VERDICT_CHAIN])
4465 return -EINVAL;
4466 chain = nf_tables_chain_lookup(ctx->table,
4467 tb[NFTA_VERDICT_CHAIN]);
4468 if (IS_ERR(chain))
4469 return PTR_ERR(chain);
4470 if (chain->flags & NFT_BASE_CHAIN)
4471 return -EOPNOTSUPP;
4472
4473 chain->use++;
4474 data->verdict.chain = chain;
4475 break;
4476 }
4477
4478 desc->len = sizeof(data->verdict);
4479 desc->type = NFT_DATA_VERDICT;
4480 return 0;
4481 }
4482
4483 static void nft_verdict_uninit(const struct nft_data *data)
4484 {
4485 switch (data->verdict.code) {
4486 case NFT_JUMP:
4487 case NFT_GOTO:
4488 data->verdict.chain->use--;
4489 break;
4490 }
4491 }
4492
4493 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
4494 {
4495 struct nlattr *nest;
4496
4497 nest = nla_nest_start(skb, type);
4498 if (!nest)
4499 goto nla_put_failure;
4500
4501 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
4502 goto nla_put_failure;
4503
4504 switch (v->code) {
4505 case NFT_JUMP:
4506 case NFT_GOTO:
4507 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
4508 v->chain->name))
4509 goto nla_put_failure;
4510 }
4511 nla_nest_end(skb, nest);
4512 return 0;
4513
4514 nla_put_failure:
4515 return -1;
4516 }
4517
4518 static int nft_value_init(const struct nft_ctx *ctx,
4519 struct nft_data *data, unsigned int size,
4520 struct nft_data_desc *desc, const struct nlattr *nla)
4521 {
4522 unsigned int len;
4523
4524 len = nla_len(nla);
4525 if (len == 0)
4526 return -EINVAL;
4527 if (len > size)
4528 return -EOVERFLOW;
4529
4530 nla_memcpy(data->data, nla, len);
4531 desc->type = NFT_DATA_VALUE;
4532 desc->len = len;
4533 return 0;
4534 }
4535
4536 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
4537 unsigned int len)
4538 {
4539 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
4540 }
4541
4542 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
4543 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
4544 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
4545 };
4546
4547 /**
4548 * nft_data_init - parse nf_tables data netlink attributes
4549 *
4550 * @ctx: context of the expression using the data
4551 * @data: destination struct nft_data
4552 * @size: maximum data length
4553 * @desc: data description
4554 * @nla: netlink attribute containing data
4555 *
4556 * Parse the netlink data attributes and initialize a struct nft_data.
4557 * The type and length of data are returned in the data description.
4558 *
4559 * The caller can indicate that it only wants to accept data of type
4560 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4561 */
4562 int nft_data_init(const struct nft_ctx *ctx,
4563 struct nft_data *data, unsigned int size,
4564 struct nft_data_desc *desc, const struct nlattr *nla)
4565 {
4566 struct nlattr *tb[NFTA_DATA_MAX + 1];
4567 int err;
4568
4569 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
4570 if (err < 0)
4571 return err;
4572
4573 if (tb[NFTA_DATA_VALUE])
4574 return nft_value_init(ctx, data, size, desc,
4575 tb[NFTA_DATA_VALUE]);
4576 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
4577 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
4578 return -EINVAL;
4579 }
4580 EXPORT_SYMBOL_GPL(nft_data_init);
4581
4582 /**
4583 * nft_data_uninit - release a nft_data item
4584 *
4585 * @data: struct nft_data to release
4586 * @type: type of data
4587 *
4588 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4589 * all others need to be released by calling this function.
4590 */
4591 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
4592 {
4593 if (type < NFT_DATA_VERDICT)
4594 return;
4595 switch (type) {
4596 case NFT_DATA_VERDICT:
4597 return nft_verdict_uninit(data);
4598 default:
4599 WARN_ON(1);
4600 }
4601 }
4602 EXPORT_SYMBOL_GPL(nft_data_uninit);
4603
4604 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4605 enum nft_data_types type, unsigned int len)
4606 {
4607 struct nlattr *nest;
4608 int err;
4609
4610 nest = nla_nest_start(skb, attr);
4611 if (nest == NULL)
4612 return -1;
4613
4614 switch (type) {
4615 case NFT_DATA_VALUE:
4616 err = nft_value_dump(skb, data, len);
4617 break;
4618 case NFT_DATA_VERDICT:
4619 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
4620 break;
4621 default:
4622 err = -EINVAL;
4623 WARN_ON(1);
4624 }
4625
4626 nla_nest_end(skb, nest);
4627 return err;
4628 }
4629 EXPORT_SYMBOL_GPL(nft_data_dump);
4630
4631 static int __net_init nf_tables_init_net(struct net *net)
4632 {
4633 INIT_LIST_HEAD(&net->nft.af_info);
4634 INIT_LIST_HEAD(&net->nft.commit_list);
4635 net->nft.base_seq = 1;
4636 return 0;
4637 }
4638
4639 int __nft_release_basechain(struct nft_ctx *ctx)
4640 {
4641 struct nft_rule *rule, *nr;
4642
4643 BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
4644
4645 nf_tables_unregister_hooks(ctx->chain->table, ctx->chain,
4646 ctx->afi->nops);
4647 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
4648 list_del(&rule->list);
4649 ctx->chain->use--;
4650 nf_tables_rule_destroy(ctx, rule);
4651 }
4652 list_del(&ctx->chain->list);
4653 ctx->table->use--;
4654 nf_tables_chain_destroy(ctx->chain);
4655
4656 return 0;
4657 }
4658 EXPORT_SYMBOL_GPL(__nft_release_basechain);
4659
4660 /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
4661 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
4662 {
4663 struct nft_table *table, *nt;
4664 struct nft_chain *chain, *nc;
4665 struct nft_rule *rule, *nr;
4666 struct nft_set *set, *ns;
4667 struct nft_ctx ctx = {
4668 .net = net,
4669 .afi = afi,
4670 };
4671
4672 list_for_each_entry_safe(table, nt, &afi->tables, list) {
4673 list_for_each_entry(chain, &table->chains, list)
4674 nf_tables_unregister_hooks(table, chain, afi->nops);
4675 /* No packets are walking on these chains anymore. */
4676 ctx.table = table;
4677 list_for_each_entry(chain, &table->chains, list) {
4678 ctx.chain = chain;
4679 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
4680 list_del(&rule->list);
4681 chain->use--;
4682 nf_tables_rule_destroy(&ctx, rule);
4683 }
4684 }
4685 list_for_each_entry_safe(set, ns, &table->sets, list) {
4686 list_del(&set->list);
4687 table->use--;
4688 nft_set_destroy(set);
4689 }
4690 list_for_each_entry_safe(chain, nc, &table->chains, list) {
4691 list_del(&chain->list);
4692 table->use--;
4693 nf_tables_chain_destroy(chain);
4694 }
4695 list_del(&table->list);
4696 nf_tables_table_destroy(&ctx);
4697 }
4698 }
4699
4700 static struct pernet_operations nf_tables_net_ops = {
4701 .init = nf_tables_init_net,
4702 };
4703
4704 static int __init nf_tables_module_init(void)
4705 {
4706 int err;
4707
4708 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4709 GFP_KERNEL);
4710 if (info == NULL) {
4711 err = -ENOMEM;
4712 goto err1;
4713 }
4714
4715 err = nf_tables_core_module_init();
4716 if (err < 0)
4717 goto err2;
4718
4719 err = nfnetlink_subsys_register(&nf_tables_subsys);
4720 if (err < 0)
4721 goto err3;
4722
4723 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4724 return register_pernet_subsys(&nf_tables_net_ops);
4725 err3:
4726 nf_tables_core_module_exit();
4727 err2:
4728 kfree(info);
4729 err1:
4730 return err;
4731 }
4732
4733 static void __exit nf_tables_module_exit(void)
4734 {
4735 unregister_pernet_subsys(&nf_tables_net_ops);
4736 nfnetlink_subsys_unregister(&nf_tables_subsys);
4737 rcu_barrier();
4738 nf_tables_core_module_exit();
4739 kfree(info);
4740 }
4741
4742 module_init(nf_tables_module_init);
4743 module_exit(nf_tables_module_exit);
4744
4745 MODULE_LICENSE("GPL");
4746 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4747 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
Linux kernel - Deliverables
This page took 0.279767 seconds and 6 git commands to generate.