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Merge tag 'char-misc-4.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
[mirror_ubuntu-artful-kernel.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 err2;
1728
1729 return expr;
1730 err2:
1731 module_put(info.ops->type->owner);
1732 err1:
1733 return ERR_PTR(err);
1734 }
1735
1736 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1737 {
1738 nf_tables_expr_destroy(ctx, expr);
1739 kfree(expr);
1740 }
1741
1742 /*
1743 * Rules
1744 */
1745
1746 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1747 u64 handle)
1748 {
1749 struct nft_rule *rule;
1750
1751 // FIXME: this sucks
1752 list_for_each_entry(rule, &chain->rules, list) {
1753 if (handle == rule->handle)
1754 return rule;
1755 }
1756
1757 return ERR_PTR(-ENOENT);
1758 }
1759
1760 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1761 const struct nlattr *nla)
1762 {
1763 if (nla == NULL)
1764 return ERR_PTR(-EINVAL);
1765
1766 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1767 }
1768
1769 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1770 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1771 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1772 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1773 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1774 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1775 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1776 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1777 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1778 .len = NFT_USERDATA_MAXLEN },
1779 };
1780
1781 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1782 u32 portid, u32 seq, int event,
1783 u32 flags, int family,
1784 const struct nft_table *table,
1785 const struct nft_chain *chain,
1786 const struct nft_rule *rule)
1787 {
1788 struct nlmsghdr *nlh;
1789 struct nfgenmsg *nfmsg;
1790 const struct nft_expr *expr, *next;
1791 struct nlattr *list;
1792 const struct nft_rule *prule;
1793 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1794
1795 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1796 flags);
1797 if (nlh == NULL)
1798 goto nla_put_failure;
1799
1800 nfmsg = nlmsg_data(nlh);
1801 nfmsg->nfgen_family = family;
1802 nfmsg->version = NFNETLINK_V0;
1803 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1804
1805 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1806 goto nla_put_failure;
1807 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1808 goto nla_put_failure;
1809 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1810 NFTA_RULE_PAD))
1811 goto nla_put_failure;
1812
1813 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1814 prule = list_entry(rule->list.prev, struct nft_rule, list);
1815 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1816 cpu_to_be64(prule->handle),
1817 NFTA_RULE_PAD))
1818 goto nla_put_failure;
1819 }
1820
1821 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1822 if (list == NULL)
1823 goto nla_put_failure;
1824 nft_rule_for_each_expr(expr, next, rule) {
1825 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
1826 goto nla_put_failure;
1827 }
1828 nla_nest_end(skb, list);
1829
1830 if (rule->udata) {
1831 struct nft_userdata *udata = nft_userdata(rule);
1832 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1833 udata->data) < 0)
1834 goto nla_put_failure;
1835 }
1836
1837 nlmsg_end(skb, nlh);
1838 return 0;
1839
1840 nla_put_failure:
1841 nlmsg_trim(skb, nlh);
1842 return -1;
1843 }
1844
1845 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1846 const struct nft_rule *rule,
1847 int event)
1848 {
1849 struct sk_buff *skb;
1850 int err;
1851
1852 if (!ctx->report &&
1853 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1854 return 0;
1855
1856 err = -ENOBUFS;
1857 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1858 if (skb == NULL)
1859 goto err;
1860
1861 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1862 event, 0, ctx->afi->family, ctx->table,
1863 ctx->chain, rule);
1864 if (err < 0) {
1865 kfree_skb(skb);
1866 goto err;
1867 }
1868
1869 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1870 ctx->report, GFP_KERNEL);
1871 err:
1872 if (err < 0) {
1873 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1874 err);
1875 }
1876 return err;
1877 }
1878
1879 static int nf_tables_dump_rules(struct sk_buff *skb,
1880 struct netlink_callback *cb)
1881 {
1882 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1883 const struct nft_af_info *afi;
1884 const struct nft_table *table;
1885 const struct nft_chain *chain;
1886 const struct nft_rule *rule;
1887 unsigned int idx = 0, s_idx = cb->args[0];
1888 struct net *net = sock_net(skb->sk);
1889 int family = nfmsg->nfgen_family;
1890
1891 rcu_read_lock();
1892 cb->seq = net->nft.base_seq;
1893
1894 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1895 if (family != NFPROTO_UNSPEC && family != afi->family)
1896 continue;
1897
1898 list_for_each_entry_rcu(table, &afi->tables, list) {
1899 list_for_each_entry_rcu(chain, &table->chains, list) {
1900 list_for_each_entry_rcu(rule, &chain->rules, list) {
1901 if (!nft_rule_is_active(net, rule))
1902 goto cont;
1903 if (idx < s_idx)
1904 goto cont;
1905 if (idx > s_idx)
1906 memset(&cb->args[1], 0,
1907 sizeof(cb->args) - sizeof(cb->args[0]));
1908 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
1909 cb->nlh->nlmsg_seq,
1910 NFT_MSG_NEWRULE,
1911 NLM_F_MULTI | NLM_F_APPEND,
1912 afi->family, table, chain, rule) < 0)
1913 goto done;
1914
1915 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1916 cont:
1917 idx++;
1918 }
1919 }
1920 }
1921 }
1922 done:
1923 rcu_read_unlock();
1924
1925 cb->args[0] = idx;
1926 return skb->len;
1927 }
1928
1929 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
1930 struct sk_buff *skb, const struct nlmsghdr *nlh,
1931 const struct nlattr * const nla[])
1932 {
1933 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1934 const struct nft_af_info *afi;
1935 const struct nft_table *table;
1936 const struct nft_chain *chain;
1937 const struct nft_rule *rule;
1938 struct sk_buff *skb2;
1939 int family = nfmsg->nfgen_family;
1940 int err;
1941
1942 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1943 struct netlink_dump_control c = {
1944 .dump = nf_tables_dump_rules,
1945 };
1946 return netlink_dump_start(nlsk, skb, nlh, &c);
1947 }
1948
1949 afi = nf_tables_afinfo_lookup(net, family, false);
1950 if (IS_ERR(afi))
1951 return PTR_ERR(afi);
1952
1953 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1954 if (IS_ERR(table))
1955 return PTR_ERR(table);
1956 if (table->flags & NFT_TABLE_INACTIVE)
1957 return -ENOENT;
1958
1959 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1960 if (IS_ERR(chain))
1961 return PTR_ERR(chain);
1962 if (chain->flags & NFT_CHAIN_INACTIVE)
1963 return -ENOENT;
1964
1965 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1966 if (IS_ERR(rule))
1967 return PTR_ERR(rule);
1968
1969 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1970 if (!skb2)
1971 return -ENOMEM;
1972
1973 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
1974 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1975 family, table, chain, rule);
1976 if (err < 0)
1977 goto err;
1978
1979 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1980
1981 err:
1982 kfree_skb(skb2);
1983 return err;
1984 }
1985
1986 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1987 struct nft_rule *rule)
1988 {
1989 struct nft_expr *expr;
1990
1991 /*
1992 * Careful: some expressions might not be initialized in case this
1993 * is called on error from nf_tables_newrule().
1994 */
1995 expr = nft_expr_first(rule);
1996 while (expr->ops && expr != nft_expr_last(rule)) {
1997 nf_tables_expr_destroy(ctx, expr);
1998 expr = nft_expr_next(expr);
1999 }
2000 kfree(rule);
2001 }
2002
2003 #define NFT_RULE_MAXEXPRS 128
2004
2005 static struct nft_expr_info *info;
2006
2007 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2008 struct sk_buff *skb, const struct nlmsghdr *nlh,
2009 const struct nlattr * const nla[])
2010 {
2011 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2012 struct nft_af_info *afi;
2013 struct nft_table *table;
2014 struct nft_chain *chain;
2015 struct nft_rule *rule, *old_rule = NULL;
2016 struct nft_userdata *udata;
2017 struct nft_trans *trans = NULL;
2018 struct nft_expr *expr;
2019 struct nft_ctx ctx;
2020 struct nlattr *tmp;
2021 unsigned int size, i, n, ulen = 0, usize = 0;
2022 int err, rem;
2023 bool create;
2024 u64 handle, pos_handle;
2025
2026 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2027
2028 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2029 if (IS_ERR(afi))
2030 return PTR_ERR(afi);
2031
2032 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
2033 if (IS_ERR(table))
2034 return PTR_ERR(table);
2035
2036 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2037 if (IS_ERR(chain))
2038 return PTR_ERR(chain);
2039
2040 if (nla[NFTA_RULE_HANDLE]) {
2041 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2042 rule = __nf_tables_rule_lookup(chain, handle);
2043 if (IS_ERR(rule))
2044 return PTR_ERR(rule);
2045
2046 if (nlh->nlmsg_flags & NLM_F_EXCL)
2047 return -EEXIST;
2048 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2049 old_rule = rule;
2050 else
2051 return -EOPNOTSUPP;
2052 } else {
2053 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2054 return -EINVAL;
2055 handle = nf_tables_alloc_handle(table);
2056
2057 if (chain->use == UINT_MAX)
2058 return -EOVERFLOW;
2059 }
2060
2061 if (nla[NFTA_RULE_POSITION]) {
2062 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2063 return -EOPNOTSUPP;
2064
2065 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2066 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2067 if (IS_ERR(old_rule))
2068 return PTR_ERR(old_rule);
2069 }
2070
2071 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2072
2073 n = 0;
2074 size = 0;
2075 if (nla[NFTA_RULE_EXPRESSIONS]) {
2076 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2077 err = -EINVAL;
2078 if (nla_type(tmp) != NFTA_LIST_ELEM)
2079 goto err1;
2080 if (n == NFT_RULE_MAXEXPRS)
2081 goto err1;
2082 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2083 if (err < 0)
2084 goto err1;
2085 size += info[n].ops->size;
2086 n++;
2087 }
2088 }
2089 /* Check for overflow of dlen field */
2090 err = -EFBIG;
2091 if (size >= 1 << 12)
2092 goto err1;
2093
2094 if (nla[NFTA_RULE_USERDATA]) {
2095 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2096 if (ulen > 0)
2097 usize = sizeof(struct nft_userdata) + ulen;
2098 }
2099
2100 err = -ENOMEM;
2101 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2102 if (rule == NULL)
2103 goto err1;
2104
2105 nft_rule_activate_next(net, rule);
2106
2107 rule->handle = handle;
2108 rule->dlen = size;
2109 rule->udata = ulen ? 1 : 0;
2110
2111 if (ulen) {
2112 udata = nft_userdata(rule);
2113 udata->len = ulen - 1;
2114 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2115 }
2116
2117 expr = nft_expr_first(rule);
2118 for (i = 0; i < n; i++) {
2119 err = nf_tables_newexpr(&ctx, &info[i], expr);
2120 if (err < 0)
2121 goto err2;
2122 info[i].ops = NULL;
2123 expr = nft_expr_next(expr);
2124 }
2125
2126 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2127 if (nft_rule_is_active_next(net, old_rule)) {
2128 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2129 old_rule);
2130 if (trans == NULL) {
2131 err = -ENOMEM;
2132 goto err2;
2133 }
2134 nft_rule_deactivate_next(net, old_rule);
2135 chain->use--;
2136 list_add_tail_rcu(&rule->list, &old_rule->list);
2137 } else {
2138 err = -ENOENT;
2139 goto err2;
2140 }
2141 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2142 if (old_rule)
2143 list_add_rcu(&rule->list, &old_rule->list);
2144 else
2145 list_add_tail_rcu(&rule->list, &chain->rules);
2146 else {
2147 if (old_rule)
2148 list_add_tail_rcu(&rule->list, &old_rule->list);
2149 else
2150 list_add_rcu(&rule->list, &chain->rules);
2151 }
2152
2153 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2154 err = -ENOMEM;
2155 goto err3;
2156 }
2157 chain->use++;
2158 return 0;
2159
2160 err3:
2161 list_del_rcu(&rule->list);
2162 err2:
2163 nf_tables_rule_destroy(&ctx, rule);
2164 err1:
2165 for (i = 0; i < n; i++) {
2166 if (info[i].ops != NULL)
2167 module_put(info[i].ops->type->owner);
2168 }
2169 return err;
2170 }
2171
2172 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2173 struct sk_buff *skb, const struct nlmsghdr *nlh,
2174 const struct nlattr * const nla[])
2175 {
2176 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2177 struct nft_af_info *afi;
2178 struct nft_table *table;
2179 struct nft_chain *chain = NULL;
2180 struct nft_rule *rule;
2181 int family = nfmsg->nfgen_family, err = 0;
2182 struct nft_ctx ctx;
2183
2184 afi = nf_tables_afinfo_lookup(net, family, false);
2185 if (IS_ERR(afi))
2186 return PTR_ERR(afi);
2187
2188 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
2189 if (IS_ERR(table))
2190 return PTR_ERR(table);
2191
2192 if (nla[NFTA_RULE_CHAIN]) {
2193 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2194 if (IS_ERR(chain))
2195 return PTR_ERR(chain);
2196 }
2197
2198 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2199
2200 if (chain) {
2201 if (nla[NFTA_RULE_HANDLE]) {
2202 rule = nf_tables_rule_lookup(chain,
2203 nla[NFTA_RULE_HANDLE]);
2204 if (IS_ERR(rule))
2205 return PTR_ERR(rule);
2206
2207 err = nft_delrule(&ctx, rule);
2208 } else {
2209 err = nft_delrule_by_chain(&ctx);
2210 }
2211 } else {
2212 list_for_each_entry(chain, &table->chains, list) {
2213 ctx.chain = chain;
2214 err = nft_delrule_by_chain(&ctx);
2215 if (err < 0)
2216 break;
2217 }
2218 }
2219
2220 return err;
2221 }
2222
2223 /*
2224 * Sets
2225 */
2226
2227 static LIST_HEAD(nf_tables_set_ops);
2228
2229 int nft_register_set(struct nft_set_ops *ops)
2230 {
2231 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2232 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2233 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2234 return 0;
2235 }
2236 EXPORT_SYMBOL_GPL(nft_register_set);
2237
2238 void nft_unregister_set(struct nft_set_ops *ops)
2239 {
2240 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2241 list_del_rcu(&ops->list);
2242 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2243 }
2244 EXPORT_SYMBOL_GPL(nft_unregister_set);
2245
2246 /*
2247 * Select a set implementation based on the data characteristics and the
2248 * given policy. The total memory use might not be known if no size is
2249 * given, in that case the amount of memory per element is used.
2250 */
2251 static const struct nft_set_ops *
2252 nft_select_set_ops(const struct nlattr * const nla[],
2253 const struct nft_set_desc *desc,
2254 enum nft_set_policies policy)
2255 {
2256 const struct nft_set_ops *ops, *bops;
2257 struct nft_set_estimate est, best;
2258 u32 features;
2259
2260 #ifdef CONFIG_MODULES
2261 if (list_empty(&nf_tables_set_ops)) {
2262 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2263 request_module("nft-set");
2264 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2265 if (!list_empty(&nf_tables_set_ops))
2266 return ERR_PTR(-EAGAIN);
2267 }
2268 #endif
2269 features = 0;
2270 if (nla[NFTA_SET_FLAGS] != NULL) {
2271 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2272 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT;
2273 }
2274
2275 bops = NULL;
2276 best.size = ~0;
2277 best.class = ~0;
2278
2279 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2280 if ((ops->features & features) != features)
2281 continue;
2282 if (!ops->estimate(desc, features, &est))
2283 continue;
2284
2285 switch (policy) {
2286 case NFT_SET_POL_PERFORMANCE:
2287 if (est.class < best.class)
2288 break;
2289 if (est.class == best.class && est.size < best.size)
2290 break;
2291 continue;
2292 case NFT_SET_POL_MEMORY:
2293 if (est.size < best.size)
2294 break;
2295 if (est.size == best.size && est.class < best.class)
2296 break;
2297 continue;
2298 default:
2299 break;
2300 }
2301
2302 if (!try_module_get(ops->owner))
2303 continue;
2304 if (bops != NULL)
2305 module_put(bops->owner);
2306
2307 bops = ops;
2308 best = est;
2309 }
2310
2311 if (bops != NULL)
2312 return bops;
2313
2314 return ERR_PTR(-EOPNOTSUPP);
2315 }
2316
2317 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2318 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2319 [NFTA_SET_NAME] = { .type = NLA_STRING,
2320 .len = NFT_SET_MAXNAMELEN - 1 },
2321 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2322 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2323 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2324 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2325 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2326 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2327 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2328 [NFTA_SET_ID] = { .type = NLA_U32 },
2329 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2330 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2331 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2332 .len = NFT_USERDATA_MAXLEN },
2333 };
2334
2335 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2336 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2337 };
2338
2339 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2340 const struct sk_buff *skb,
2341 const struct nlmsghdr *nlh,
2342 const struct nlattr * const nla[])
2343 {
2344 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2345 struct nft_af_info *afi = NULL;
2346 struct nft_table *table = NULL;
2347
2348 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2349 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2350 if (IS_ERR(afi))
2351 return PTR_ERR(afi);
2352 }
2353
2354 if (nla[NFTA_SET_TABLE] != NULL) {
2355 if (afi == NULL)
2356 return -EAFNOSUPPORT;
2357
2358 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2359 if (IS_ERR(table))
2360 return PTR_ERR(table);
2361 }
2362
2363 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
2364 return 0;
2365 }
2366
2367 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2368 const struct nlattr *nla)
2369 {
2370 struct nft_set *set;
2371
2372 if (nla == NULL)
2373 return ERR_PTR(-EINVAL);
2374
2375 list_for_each_entry(set, &table->sets, list) {
2376 if (!nla_strcmp(nla, set->name))
2377 return set;
2378 }
2379 return ERR_PTR(-ENOENT);
2380 }
2381
2382 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2383 const struct nlattr *nla)
2384 {
2385 struct nft_trans *trans;
2386 u32 id = ntohl(nla_get_be32(nla));
2387
2388 list_for_each_entry(trans, &net->nft.commit_list, list) {
2389 if (trans->msg_type == NFT_MSG_NEWSET &&
2390 id == nft_trans_set_id(trans))
2391 return nft_trans_set(trans);
2392 }
2393 return ERR_PTR(-ENOENT);
2394 }
2395
2396 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2397 const char *name)
2398 {
2399 const struct nft_set *i;
2400 const char *p;
2401 unsigned long *inuse;
2402 unsigned int n = 0, min = 0;
2403
2404 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
2405 if (p != NULL) {
2406 if (p[1] != 'd' || strchr(p + 2, '%'))
2407 return -EINVAL;
2408
2409 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2410 if (inuse == NULL)
2411 return -ENOMEM;
2412 cont:
2413 list_for_each_entry(i, &ctx->table->sets, list) {
2414 int tmp;
2415
2416 if (!sscanf(i->name, name, &tmp))
2417 continue;
2418 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2419 continue;
2420
2421 set_bit(tmp - min, inuse);
2422 }
2423
2424 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2425 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2426 min += BITS_PER_BYTE * PAGE_SIZE;
2427 memset(inuse, 0, PAGE_SIZE);
2428 goto cont;
2429 }
2430 free_page((unsigned long)inuse);
2431 }
2432
2433 snprintf(set->name, sizeof(set->name), name, min + n);
2434 list_for_each_entry(i, &ctx->table->sets, list) {
2435 if (!strcmp(set->name, i->name))
2436 return -ENFILE;
2437 }
2438 return 0;
2439 }
2440
2441 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2442 const struct nft_set *set, u16 event, u16 flags)
2443 {
2444 struct nfgenmsg *nfmsg;
2445 struct nlmsghdr *nlh;
2446 struct nlattr *desc;
2447 u32 portid = ctx->portid;
2448 u32 seq = ctx->seq;
2449
2450 event |= NFNL_SUBSYS_NFTABLES << 8;
2451 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2452 flags);
2453 if (nlh == NULL)
2454 goto nla_put_failure;
2455
2456 nfmsg = nlmsg_data(nlh);
2457 nfmsg->nfgen_family = ctx->afi->family;
2458 nfmsg->version = NFNETLINK_V0;
2459 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2460
2461 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2462 goto nla_put_failure;
2463 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2464 goto nla_put_failure;
2465 if (set->flags != 0)
2466 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2467 goto nla_put_failure;
2468
2469 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2470 goto nla_put_failure;
2471 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2472 goto nla_put_failure;
2473 if (set->flags & NFT_SET_MAP) {
2474 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2475 goto nla_put_failure;
2476 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2477 goto nla_put_failure;
2478 }
2479
2480 if (set->timeout &&
2481 nla_put_be64(skb, NFTA_SET_TIMEOUT, cpu_to_be64(set->timeout),
2482 NFTA_SET_PAD))
2483 goto nla_put_failure;
2484 if (set->gc_int &&
2485 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2486 goto nla_put_failure;
2487
2488 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2489 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2490 goto nla_put_failure;
2491 }
2492
2493 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2494 goto nla_put_failure;
2495
2496 desc = nla_nest_start(skb, NFTA_SET_DESC);
2497 if (desc == NULL)
2498 goto nla_put_failure;
2499 if (set->size &&
2500 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2501 goto nla_put_failure;
2502 nla_nest_end(skb, desc);
2503
2504 nlmsg_end(skb, nlh);
2505 return 0;
2506
2507 nla_put_failure:
2508 nlmsg_trim(skb, nlh);
2509 return -1;
2510 }
2511
2512 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2513 const struct nft_set *set,
2514 int event, gfp_t gfp_flags)
2515 {
2516 struct sk_buff *skb;
2517 u32 portid = ctx->portid;
2518 int err;
2519
2520 if (!ctx->report &&
2521 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2522 return 0;
2523
2524 err = -ENOBUFS;
2525 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2526 if (skb == NULL)
2527 goto err;
2528
2529 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2530 if (err < 0) {
2531 kfree_skb(skb);
2532 goto err;
2533 }
2534
2535 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2536 ctx->report, gfp_flags);
2537 err:
2538 if (err < 0)
2539 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2540 return err;
2541 }
2542
2543 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2544 {
2545 const struct nft_set *set;
2546 unsigned int idx, s_idx = cb->args[0];
2547 struct nft_af_info *afi;
2548 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2549 struct net *net = sock_net(skb->sk);
2550 int cur_family = cb->args[3];
2551 struct nft_ctx *ctx = cb->data, ctx_set;
2552
2553 if (cb->args[1])
2554 return skb->len;
2555
2556 rcu_read_lock();
2557 cb->seq = net->nft.base_seq;
2558
2559 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2560 if (ctx->afi && ctx->afi != afi)
2561 continue;
2562
2563 if (cur_family) {
2564 if (afi->family != cur_family)
2565 continue;
2566
2567 cur_family = 0;
2568 }
2569 list_for_each_entry_rcu(table, &afi->tables, list) {
2570 if (ctx->table && ctx->table != table)
2571 continue;
2572
2573 if (cur_table) {
2574 if (cur_table != table)
2575 continue;
2576
2577 cur_table = NULL;
2578 }
2579 idx = 0;
2580 list_for_each_entry_rcu(set, &table->sets, list) {
2581 if (idx < s_idx)
2582 goto cont;
2583
2584 ctx_set = *ctx;
2585 ctx_set.table = table;
2586 ctx_set.afi = afi;
2587 if (nf_tables_fill_set(skb, &ctx_set, set,
2588 NFT_MSG_NEWSET,
2589 NLM_F_MULTI) < 0) {
2590 cb->args[0] = idx;
2591 cb->args[2] = (unsigned long) table;
2592 cb->args[3] = afi->family;
2593 goto done;
2594 }
2595 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2596 cont:
2597 idx++;
2598 }
2599 if (s_idx)
2600 s_idx = 0;
2601 }
2602 }
2603 cb->args[1] = 1;
2604 done:
2605 rcu_read_unlock();
2606 return skb->len;
2607 }
2608
2609 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2610 {
2611 kfree(cb->data);
2612 return 0;
2613 }
2614
2615 static int nf_tables_getset(struct net *net, struct sock *nlsk,
2616 struct sk_buff *skb, const struct nlmsghdr *nlh,
2617 const struct nlattr * const nla[])
2618 {
2619 const struct nft_set *set;
2620 struct nft_ctx ctx;
2621 struct sk_buff *skb2;
2622 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2623 int err;
2624
2625 /* Verify existence before starting dump */
2626 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla);
2627 if (err < 0)
2628 return err;
2629
2630 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2631 struct netlink_dump_control c = {
2632 .dump = nf_tables_dump_sets,
2633 .done = nf_tables_dump_sets_done,
2634 };
2635 struct nft_ctx *ctx_dump;
2636
2637 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2638 if (ctx_dump == NULL)
2639 return -ENOMEM;
2640
2641 *ctx_dump = ctx;
2642 c.data = ctx_dump;
2643
2644 return netlink_dump_start(nlsk, skb, nlh, &c);
2645 }
2646
2647 /* Only accept unspec with dump */
2648 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2649 return -EAFNOSUPPORT;
2650
2651 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2652 if (IS_ERR(set))
2653 return PTR_ERR(set);
2654 if (set->flags & NFT_SET_INACTIVE)
2655 return -ENOENT;
2656
2657 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2658 if (skb2 == NULL)
2659 return -ENOMEM;
2660
2661 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2662 if (err < 0)
2663 goto err;
2664
2665 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2666
2667 err:
2668 kfree_skb(skb2);
2669 return err;
2670 }
2671
2672 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2673 struct nft_set_desc *desc,
2674 const struct nlattr *nla)
2675 {
2676 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2677 int err;
2678
2679 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2680 if (err < 0)
2681 return err;
2682
2683 if (da[NFTA_SET_DESC_SIZE] != NULL)
2684 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2685
2686 return 0;
2687 }
2688
2689 static int nf_tables_newset(struct net *net, struct sock *nlsk,
2690 struct sk_buff *skb, const struct nlmsghdr *nlh,
2691 const struct nlattr * const nla[])
2692 {
2693 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2694 const struct nft_set_ops *ops;
2695 struct nft_af_info *afi;
2696 struct nft_table *table;
2697 struct nft_set *set;
2698 struct nft_ctx ctx;
2699 char name[NFT_SET_MAXNAMELEN];
2700 unsigned int size;
2701 bool create;
2702 u64 timeout;
2703 u32 ktype, dtype, flags, policy, gc_int;
2704 struct nft_set_desc desc;
2705 unsigned char *udata;
2706 u16 udlen;
2707 int err;
2708
2709 if (nla[NFTA_SET_TABLE] == NULL ||
2710 nla[NFTA_SET_NAME] == NULL ||
2711 nla[NFTA_SET_KEY_LEN] == NULL ||
2712 nla[NFTA_SET_ID] == NULL)
2713 return -EINVAL;
2714
2715 memset(&desc, 0, sizeof(desc));
2716
2717 ktype = NFT_DATA_VALUE;
2718 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2719 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2720 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2721 return -EINVAL;
2722 }
2723
2724 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2725 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
2726 return -EINVAL;
2727
2728 flags = 0;
2729 if (nla[NFTA_SET_FLAGS] != NULL) {
2730 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2731 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2732 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2733 NFT_SET_MAP | NFT_SET_EVAL))
2734 return -EINVAL;
2735 /* Only one of both operations is supported */
2736 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL)) ==
2737 (NFT_SET_MAP | NFT_SET_EVAL))
2738 return -EOPNOTSUPP;
2739 }
2740
2741 dtype = 0;
2742 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2743 if (!(flags & NFT_SET_MAP))
2744 return -EINVAL;
2745
2746 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2747 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2748 dtype != NFT_DATA_VERDICT)
2749 return -EINVAL;
2750
2751 if (dtype != NFT_DATA_VERDICT) {
2752 if (nla[NFTA_SET_DATA_LEN] == NULL)
2753 return -EINVAL;
2754 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2755 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
2756 return -EINVAL;
2757 } else
2758 desc.dlen = sizeof(struct nft_verdict);
2759 } else if (flags & NFT_SET_MAP)
2760 return -EINVAL;
2761
2762 timeout = 0;
2763 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2764 if (!(flags & NFT_SET_TIMEOUT))
2765 return -EINVAL;
2766 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_TIMEOUT]));
2767 }
2768 gc_int = 0;
2769 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2770 if (!(flags & NFT_SET_TIMEOUT))
2771 return -EINVAL;
2772 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2773 }
2774
2775 policy = NFT_SET_POL_PERFORMANCE;
2776 if (nla[NFTA_SET_POLICY] != NULL)
2777 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2778
2779 if (nla[NFTA_SET_DESC] != NULL) {
2780 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2781 if (err < 0)
2782 return err;
2783 }
2784
2785 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2786
2787 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2788 if (IS_ERR(afi))
2789 return PTR_ERR(afi);
2790
2791 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2792 if (IS_ERR(table))
2793 return PTR_ERR(table);
2794
2795 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
2796
2797 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2798 if (IS_ERR(set)) {
2799 if (PTR_ERR(set) != -ENOENT)
2800 return PTR_ERR(set);
2801 set = NULL;
2802 }
2803
2804 if (set != NULL) {
2805 if (nlh->nlmsg_flags & NLM_F_EXCL)
2806 return -EEXIST;
2807 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2808 return -EOPNOTSUPP;
2809 return 0;
2810 }
2811
2812 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2813 return -ENOENT;
2814
2815 ops = nft_select_set_ops(nla, &desc, policy);
2816 if (IS_ERR(ops))
2817 return PTR_ERR(ops);
2818
2819 udlen = 0;
2820 if (nla[NFTA_SET_USERDATA])
2821 udlen = nla_len(nla[NFTA_SET_USERDATA]);
2822
2823 size = 0;
2824 if (ops->privsize != NULL)
2825 size = ops->privsize(nla);
2826
2827 err = -ENOMEM;
2828 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
2829 if (set == NULL)
2830 goto err1;
2831
2832 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2833 err = nf_tables_set_alloc_name(&ctx, set, name);
2834 if (err < 0)
2835 goto err2;
2836
2837 udata = NULL;
2838 if (udlen) {
2839 udata = set->data + size;
2840 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
2841 }
2842
2843 INIT_LIST_HEAD(&set->bindings);
2844 write_pnet(&set->pnet, net);
2845 set->ops = ops;
2846 set->ktype = ktype;
2847 set->klen = desc.klen;
2848 set->dtype = dtype;
2849 set->dlen = desc.dlen;
2850 set->flags = flags;
2851 set->size = desc.size;
2852 set->policy = policy;
2853 set->udlen = udlen;
2854 set->udata = udata;
2855 set->timeout = timeout;
2856 set->gc_int = gc_int;
2857
2858 err = ops->init(set, &desc, nla);
2859 if (err < 0)
2860 goto err2;
2861
2862 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2863 if (err < 0)
2864 goto err2;
2865
2866 list_add_tail_rcu(&set->list, &table->sets);
2867 table->use++;
2868 return 0;
2869
2870 err2:
2871 kfree(set);
2872 err1:
2873 module_put(ops->owner);
2874 return err;
2875 }
2876
2877 static void nft_set_destroy(struct nft_set *set)
2878 {
2879 set->ops->destroy(set);
2880 module_put(set->ops->owner);
2881 kfree(set);
2882 }
2883
2884 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2885 {
2886 list_del_rcu(&set->list);
2887 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
2888 nft_set_destroy(set);
2889 }
2890
2891 static int nf_tables_delset(struct net *net, struct sock *nlsk,
2892 struct sk_buff *skb, const struct nlmsghdr *nlh,
2893 const struct nlattr * const nla[])
2894 {
2895 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2896 struct nft_set *set;
2897 struct nft_ctx ctx;
2898 int err;
2899
2900 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2901 return -EAFNOSUPPORT;
2902 if (nla[NFTA_SET_TABLE] == NULL)
2903 return -EINVAL;
2904
2905 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla);
2906 if (err < 0)
2907 return err;
2908
2909 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2910 if (IS_ERR(set))
2911 return PTR_ERR(set);
2912 if (!list_empty(&set->bindings))
2913 return -EBUSY;
2914
2915 return nft_delset(&ctx, set);
2916 }
2917
2918 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2919 const struct nft_set *set,
2920 const struct nft_set_iter *iter,
2921 const struct nft_set_elem *elem)
2922 {
2923 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
2924 enum nft_registers dreg;
2925
2926 dreg = nft_type_to_reg(set->dtype);
2927 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
2928 set->dtype == NFT_DATA_VERDICT ?
2929 NFT_DATA_VERDICT : NFT_DATA_VALUE,
2930 set->dlen);
2931 }
2932
2933 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2934 struct nft_set_binding *binding)
2935 {
2936 struct nft_set_binding *i;
2937 struct nft_set_iter iter;
2938
2939 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2940 return -EBUSY;
2941
2942 if (binding->flags & NFT_SET_MAP) {
2943 /* If the set is already bound to the same chain all
2944 * jumps are already validated for that chain.
2945 */
2946 list_for_each_entry(i, &set->bindings, list) {
2947 if (binding->flags & NFT_SET_MAP &&
2948 i->chain == binding->chain)
2949 goto bind;
2950 }
2951
2952 iter.skip = 0;
2953 iter.count = 0;
2954 iter.err = 0;
2955 iter.fn = nf_tables_bind_check_setelem;
2956
2957 set->ops->walk(ctx, set, &iter);
2958 if (iter.err < 0) {
2959 /* Destroy anonymous sets if binding fails */
2960 if (set->flags & NFT_SET_ANONYMOUS)
2961 nf_tables_set_destroy(ctx, set);
2962
2963 return iter.err;
2964 }
2965 }
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.skip = cb->args[0];
3196 args.iter.count = 0;
3197 args.iter.err = 0;
3198 args.iter.fn = nf_tables_dump_setelem;
3199 set->ops->walk(&ctx, set, &args.iter);
3200
3201 nla_nest_end(skb, nest);
3202 nlmsg_end(skb, nlh);
3203
3204 if (args.iter.err && args.iter.err != -EMSGSIZE)
3205 return args.iter.err;
3206 if (args.iter.count == cb->args[0])
3207 return 0;
3208
3209 cb->args[0] = args.iter.count;
3210 return skb->len;
3211
3212 nla_put_failure:
3213 return -ENOSPC;
3214 }
3215
3216 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3217 struct sk_buff *skb, const struct nlmsghdr *nlh,
3218 const struct nlattr * const nla[])
3219 {
3220 const struct nft_set *set;
3221 struct nft_ctx ctx;
3222 int err;
3223
3224 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla);
3225 if (err < 0)
3226 return err;
3227 if (ctx.table->flags & NFT_TABLE_INACTIVE)
3228 return -ENOENT;
3229
3230 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3231 if (IS_ERR(set))
3232 return PTR_ERR(set);
3233 if (set->flags & NFT_SET_INACTIVE)
3234 return -ENOENT;
3235
3236 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3237 struct netlink_dump_control c = {
3238 .dump = nf_tables_dump_set,
3239 };
3240 return netlink_dump_start(nlsk, skb, nlh, &c);
3241 }
3242 return -EOPNOTSUPP;
3243 }
3244
3245 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3246 const struct nft_ctx *ctx, u32 seq,
3247 u32 portid, int event, u16 flags,
3248 const struct nft_set *set,
3249 const struct nft_set_elem *elem)
3250 {
3251 struct nfgenmsg *nfmsg;
3252 struct nlmsghdr *nlh;
3253 struct nlattr *nest;
3254 int err;
3255
3256 event |= NFNL_SUBSYS_NFTABLES << 8;
3257 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3258 flags);
3259 if (nlh == NULL)
3260 goto nla_put_failure;
3261
3262 nfmsg = nlmsg_data(nlh);
3263 nfmsg->nfgen_family = ctx->afi->family;
3264 nfmsg->version = NFNETLINK_V0;
3265 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3266
3267 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3268 goto nla_put_failure;
3269 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3270 goto nla_put_failure;
3271
3272 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3273 if (nest == NULL)
3274 goto nla_put_failure;
3275
3276 err = nf_tables_fill_setelem(skb, set, elem);
3277 if (err < 0)
3278 goto nla_put_failure;
3279
3280 nla_nest_end(skb, nest);
3281
3282 nlmsg_end(skb, nlh);
3283 return 0;
3284
3285 nla_put_failure:
3286 nlmsg_trim(skb, nlh);
3287 return -1;
3288 }
3289
3290 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3291 const struct nft_set *set,
3292 const struct nft_set_elem *elem,
3293 int event, u16 flags)
3294 {
3295 struct net *net = ctx->net;
3296 u32 portid = ctx->portid;
3297 struct sk_buff *skb;
3298 int err;
3299
3300 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3301 return 0;
3302
3303 err = -ENOBUFS;
3304 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3305 if (skb == NULL)
3306 goto err;
3307
3308 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3309 set, elem);
3310 if (err < 0) {
3311 kfree_skb(skb);
3312 goto err;
3313 }
3314
3315 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3316 GFP_KERNEL);
3317 err:
3318 if (err < 0)
3319 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3320 return err;
3321 }
3322
3323 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3324 int msg_type,
3325 struct nft_set *set)
3326 {
3327 struct nft_trans *trans;
3328
3329 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3330 if (trans == NULL)
3331 return NULL;
3332
3333 nft_trans_elem_set(trans) = set;
3334 return trans;
3335 }
3336
3337 void *nft_set_elem_init(const struct nft_set *set,
3338 const struct nft_set_ext_tmpl *tmpl,
3339 const u32 *key, const u32 *data,
3340 u64 timeout, gfp_t gfp)
3341 {
3342 struct nft_set_ext *ext;
3343 void *elem;
3344
3345 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3346 if (elem == NULL)
3347 return NULL;
3348
3349 ext = nft_set_elem_ext(set, elem);
3350 nft_set_ext_init(ext, tmpl);
3351
3352 memcpy(nft_set_ext_key(ext), key, set->klen);
3353 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3354 memcpy(nft_set_ext_data(ext), data, set->dlen);
3355 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3356 *nft_set_ext_expiration(ext) =
3357 jiffies + msecs_to_jiffies(timeout);
3358 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3359 *nft_set_ext_timeout(ext) = timeout;
3360
3361 return elem;
3362 }
3363
3364 void nft_set_elem_destroy(const struct nft_set *set, void *elem)
3365 {
3366 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3367
3368 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3369 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3370 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
3371 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3372 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3373
3374 kfree(elem);
3375 }
3376 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3377
3378 static int nft_setelem_parse_flags(const struct nft_set *set,
3379 const struct nlattr *attr, u32 *flags)
3380 {
3381 if (attr == NULL)
3382 return 0;
3383
3384 *flags = ntohl(nla_get_be32(attr));
3385 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3386 return -EINVAL;
3387 if (!(set->flags & NFT_SET_INTERVAL) &&
3388 *flags & NFT_SET_ELEM_INTERVAL_END)
3389 return -EINVAL;
3390
3391 return 0;
3392 }
3393
3394 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3395 const struct nlattr *attr)
3396 {
3397 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3398 struct nft_data_desc d1, d2;
3399 struct nft_set_ext_tmpl tmpl;
3400 struct nft_set_ext *ext;
3401 struct nft_set_elem elem;
3402 struct nft_set_binding *binding;
3403 struct nft_userdata *udata;
3404 struct nft_data data;
3405 enum nft_registers dreg;
3406 struct nft_trans *trans;
3407 u32 flags = 0;
3408 u64 timeout;
3409 u8 ulen;
3410 int err;
3411
3412 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3413 nft_set_elem_policy);
3414 if (err < 0)
3415 return err;
3416
3417 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3418 return -EINVAL;
3419
3420 nft_set_ext_prepare(&tmpl);
3421
3422 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3423 if (err < 0)
3424 return err;
3425 if (flags != 0)
3426 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3427
3428 if (set->flags & NFT_SET_MAP) {
3429 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3430 !(flags & NFT_SET_ELEM_INTERVAL_END))
3431 return -EINVAL;
3432 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3433 flags & NFT_SET_ELEM_INTERVAL_END)
3434 return -EINVAL;
3435 } else {
3436 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3437 return -EINVAL;
3438 }
3439
3440 timeout = 0;
3441 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3442 if (!(set->flags & NFT_SET_TIMEOUT))
3443 return -EINVAL;
3444 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_ELEM_TIMEOUT]));
3445 } else if (set->flags & NFT_SET_TIMEOUT) {
3446 timeout = set->timeout;
3447 }
3448
3449 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3450 nla[NFTA_SET_ELEM_KEY]);
3451 if (err < 0)
3452 goto err1;
3453 err = -EINVAL;
3454 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3455 goto err2;
3456
3457 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3458 if (timeout > 0) {
3459 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3460 if (timeout != set->timeout)
3461 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3462 }
3463
3464 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3465 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3466 nla[NFTA_SET_ELEM_DATA]);
3467 if (err < 0)
3468 goto err2;
3469
3470 err = -EINVAL;
3471 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3472 goto err3;
3473
3474 dreg = nft_type_to_reg(set->dtype);
3475 list_for_each_entry(binding, &set->bindings, list) {
3476 struct nft_ctx bind_ctx = {
3477 .afi = ctx->afi,
3478 .table = ctx->table,
3479 .chain = (struct nft_chain *)binding->chain,
3480 };
3481
3482 if (!(binding->flags & NFT_SET_MAP))
3483 continue;
3484
3485 err = nft_validate_register_store(&bind_ctx, dreg,
3486 &data,
3487 d2.type, d2.len);
3488 if (err < 0)
3489 goto err3;
3490 }
3491
3492 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
3493 }
3494
3495 /* The full maximum length of userdata can exceed the maximum
3496 * offset value (U8_MAX) for following extensions, therefor it
3497 * must be the last extension added.
3498 */
3499 ulen = 0;
3500 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3501 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3502 if (ulen > 0)
3503 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3504 ulen);
3505 }
3506
3507 err = -ENOMEM;
3508 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
3509 timeout, GFP_KERNEL);
3510 if (elem.priv == NULL)
3511 goto err3;
3512
3513 ext = nft_set_elem_ext(set, elem.priv);
3514 if (flags)
3515 *nft_set_ext_flags(ext) = flags;
3516 if (ulen > 0) {
3517 udata = nft_set_ext_userdata(ext);
3518 udata->len = ulen - 1;
3519 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3520 }
3521
3522 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3523 if (trans == NULL)
3524 goto err4;
3525
3526 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
3527 err = set->ops->insert(set, &elem);
3528 if (err < 0)
3529 goto err5;
3530
3531 nft_trans_elem(trans) = elem;
3532 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3533 return 0;
3534
3535 err5:
3536 kfree(trans);
3537 err4:
3538 kfree(elem.priv);
3539 err3:
3540 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3541 nft_data_uninit(&data, d2.type);
3542 err2:
3543 nft_data_uninit(&elem.key.val, d1.type);
3544 err1:
3545 return err;
3546 }
3547
3548 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3549 struct sk_buff *skb, const struct nlmsghdr *nlh,
3550 const struct nlattr * const nla[])
3551 {
3552 const struct nlattr *attr;
3553 struct nft_set *set;
3554 struct nft_ctx ctx;
3555 int rem, err = 0;
3556
3557 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3558 return -EINVAL;
3559
3560 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla);
3561 if (err < 0)
3562 return err;
3563
3564 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3565 if (IS_ERR(set)) {
3566 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3567 set = nf_tables_set_lookup_byid(net,
3568 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3569 }
3570 if (IS_ERR(set))
3571 return PTR_ERR(set);
3572 }
3573
3574 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3575 return -EBUSY;
3576
3577 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3578 if (set->size &&
3579 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact))
3580 return -ENFILE;
3581
3582 err = nft_add_set_elem(&ctx, set, attr);
3583 if (err < 0) {
3584 atomic_dec(&set->nelems);
3585 break;
3586 }
3587 }
3588 return err;
3589 }
3590
3591 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3592 const struct nlattr *attr)
3593 {
3594 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3595 struct nft_set_ext_tmpl tmpl;
3596 struct nft_data_desc desc;
3597 struct nft_set_elem elem;
3598 struct nft_set_ext *ext;
3599 struct nft_trans *trans;
3600 u32 flags = 0;
3601 void *priv;
3602 int err;
3603
3604 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3605 nft_set_elem_policy);
3606 if (err < 0)
3607 goto err1;
3608
3609 err = -EINVAL;
3610 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3611 goto err1;
3612
3613 nft_set_ext_prepare(&tmpl);
3614
3615 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3616 if (err < 0)
3617 return err;
3618 if (flags != 0)
3619 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3620
3621 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3622 nla[NFTA_SET_ELEM_KEY]);
3623 if (err < 0)
3624 goto err1;
3625
3626 err = -EINVAL;
3627 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3628 goto err2;
3629
3630 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3631
3632 err = -ENOMEM;
3633 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3634 GFP_KERNEL);
3635 if (elem.priv == NULL)
3636 goto err2;
3637
3638 ext = nft_set_elem_ext(set, elem.priv);
3639 if (flags)
3640 *nft_set_ext_flags(ext) = flags;
3641
3642 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3643 if (trans == NULL) {
3644 err = -ENOMEM;
3645 goto err3;
3646 }
3647
3648 priv = set->ops->deactivate(set, &elem);
3649 if (priv == NULL) {
3650 err = -ENOENT;
3651 goto err4;
3652 }
3653 kfree(elem.priv);
3654 elem.priv = priv;
3655
3656 nft_trans_elem(trans) = elem;
3657 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3658 return 0;
3659
3660 err4:
3661 kfree(trans);
3662 err3:
3663 kfree(elem.priv);
3664 err2:
3665 nft_data_uninit(&elem.key.val, desc.type);
3666 err1:
3667 return err;
3668 }
3669
3670 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3671 struct sk_buff *skb, const struct nlmsghdr *nlh,
3672 const struct nlattr * const nla[])
3673 {
3674 const struct nlattr *attr;
3675 struct nft_set *set;
3676 struct nft_ctx ctx;
3677 int rem, err = 0;
3678
3679 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3680 return -EINVAL;
3681
3682 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla);
3683 if (err < 0)
3684 return err;
3685
3686 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3687 if (IS_ERR(set))
3688 return PTR_ERR(set);
3689 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3690 return -EBUSY;
3691
3692 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3693 err = nft_del_setelem(&ctx, set, attr);
3694 if (err < 0)
3695 break;
3696
3697 set->ndeact++;
3698 }
3699 return err;
3700 }
3701
3702 void nft_set_gc_batch_release(struct rcu_head *rcu)
3703 {
3704 struct nft_set_gc_batch *gcb;
3705 unsigned int i;
3706
3707 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
3708 for (i = 0; i < gcb->head.cnt; i++)
3709 nft_set_elem_destroy(gcb->head.set, gcb->elems[i]);
3710 kfree(gcb);
3711 }
3712 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
3713
3714 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
3715 gfp_t gfp)
3716 {
3717 struct nft_set_gc_batch *gcb;
3718
3719 gcb = kzalloc(sizeof(*gcb), gfp);
3720 if (gcb == NULL)
3721 return gcb;
3722 gcb->head.set = set;
3723 return gcb;
3724 }
3725 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
3726
3727 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
3728 u32 portid, u32 seq)
3729 {
3730 struct nlmsghdr *nlh;
3731 struct nfgenmsg *nfmsg;
3732 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
3733
3734 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
3735 if (nlh == NULL)
3736 goto nla_put_failure;
3737
3738 nfmsg = nlmsg_data(nlh);
3739 nfmsg->nfgen_family = AF_UNSPEC;
3740 nfmsg->version = NFNETLINK_V0;
3741 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3742
3743 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
3744 goto nla_put_failure;
3745
3746 nlmsg_end(skb, nlh);
3747 return 0;
3748
3749 nla_put_failure:
3750 nlmsg_trim(skb, nlh);
3751 return -EMSGSIZE;
3752 }
3753
3754 static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
3755 {
3756 struct nlmsghdr *nlh = nlmsg_hdr(skb);
3757 struct sk_buff *skb2;
3758 int err;
3759
3760 if (nlmsg_report(nlh) &&
3761 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3762 return 0;
3763
3764 err = -ENOBUFS;
3765 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3766 if (skb2 == NULL)
3767 goto err;
3768
3769 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3770 nlh->nlmsg_seq);
3771 if (err < 0) {
3772 kfree_skb(skb2);
3773 goto err;
3774 }
3775
3776 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
3777 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
3778 err:
3779 if (err < 0) {
3780 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
3781 err);
3782 }
3783 return err;
3784 }
3785
3786 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
3787 struct sk_buff *skb, const struct nlmsghdr *nlh,
3788 const struct nlattr * const nla[])
3789 {
3790 struct sk_buff *skb2;
3791 int err;
3792
3793 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3794 if (skb2 == NULL)
3795 return -ENOMEM;
3796
3797 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3798 nlh->nlmsg_seq);
3799 if (err < 0)
3800 goto err;
3801
3802 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3803 err:
3804 kfree_skb(skb2);
3805 return err;
3806 }
3807
3808 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3809 [NFT_MSG_NEWTABLE] = {
3810 .call_batch = nf_tables_newtable,
3811 .attr_count = NFTA_TABLE_MAX,
3812 .policy = nft_table_policy,
3813 },
3814 [NFT_MSG_GETTABLE] = {
3815 .call = nf_tables_gettable,
3816 .attr_count = NFTA_TABLE_MAX,
3817 .policy = nft_table_policy,
3818 },
3819 [NFT_MSG_DELTABLE] = {
3820 .call_batch = nf_tables_deltable,
3821 .attr_count = NFTA_TABLE_MAX,
3822 .policy = nft_table_policy,
3823 },
3824 [NFT_MSG_NEWCHAIN] = {
3825 .call_batch = nf_tables_newchain,
3826 .attr_count = NFTA_CHAIN_MAX,
3827 .policy = nft_chain_policy,
3828 },
3829 [NFT_MSG_GETCHAIN] = {
3830 .call = nf_tables_getchain,
3831 .attr_count = NFTA_CHAIN_MAX,
3832 .policy = nft_chain_policy,
3833 },
3834 [NFT_MSG_DELCHAIN] = {
3835 .call_batch = nf_tables_delchain,
3836 .attr_count = NFTA_CHAIN_MAX,
3837 .policy = nft_chain_policy,
3838 },
3839 [NFT_MSG_NEWRULE] = {
3840 .call_batch = nf_tables_newrule,
3841 .attr_count = NFTA_RULE_MAX,
3842 .policy = nft_rule_policy,
3843 },
3844 [NFT_MSG_GETRULE] = {
3845 .call = nf_tables_getrule,
3846 .attr_count = NFTA_RULE_MAX,
3847 .policy = nft_rule_policy,
3848 },
3849 [NFT_MSG_DELRULE] = {
3850 .call_batch = nf_tables_delrule,
3851 .attr_count = NFTA_RULE_MAX,
3852 .policy = nft_rule_policy,
3853 },
3854 [NFT_MSG_NEWSET] = {
3855 .call_batch = nf_tables_newset,
3856 .attr_count = NFTA_SET_MAX,
3857 .policy = nft_set_policy,
3858 },
3859 [NFT_MSG_GETSET] = {
3860 .call = nf_tables_getset,
3861 .attr_count = NFTA_SET_MAX,
3862 .policy = nft_set_policy,
3863 },
3864 [NFT_MSG_DELSET] = {
3865 .call_batch = nf_tables_delset,
3866 .attr_count = NFTA_SET_MAX,
3867 .policy = nft_set_policy,
3868 },
3869 [NFT_MSG_NEWSETELEM] = {
3870 .call_batch = nf_tables_newsetelem,
3871 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3872 .policy = nft_set_elem_list_policy,
3873 },
3874 [NFT_MSG_GETSETELEM] = {
3875 .call = nf_tables_getsetelem,
3876 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3877 .policy = nft_set_elem_list_policy,
3878 },
3879 [NFT_MSG_DELSETELEM] = {
3880 .call_batch = nf_tables_delsetelem,
3881 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3882 .policy = nft_set_elem_list_policy,
3883 },
3884 [NFT_MSG_GETGEN] = {
3885 .call = nf_tables_getgen,
3886 },
3887 };
3888
3889 static void nft_chain_commit_update(struct nft_trans *trans)
3890 {
3891 struct nft_base_chain *basechain;
3892
3893 if (nft_trans_chain_name(trans)[0])
3894 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3895
3896 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3897 return;
3898
3899 basechain = nft_base_chain(trans->ctx.chain);
3900 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3901
3902 switch (nft_trans_chain_policy(trans)) {
3903 case NF_DROP:
3904 case NF_ACCEPT:
3905 basechain->policy = nft_trans_chain_policy(trans);
3906 break;
3907 }
3908 }
3909
3910 static void nf_tables_commit_release(struct nft_trans *trans)
3911 {
3912 switch (trans->msg_type) {
3913 case NFT_MSG_DELTABLE:
3914 nf_tables_table_destroy(&trans->ctx);
3915 break;
3916 case NFT_MSG_DELCHAIN:
3917 nf_tables_chain_destroy(trans->ctx.chain);
3918 break;
3919 case NFT_MSG_DELRULE:
3920 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3921 break;
3922 case NFT_MSG_DELSET:
3923 nft_set_destroy(nft_trans_set(trans));
3924 break;
3925 case NFT_MSG_DELSETELEM:
3926 nft_set_elem_destroy(nft_trans_elem_set(trans),
3927 nft_trans_elem(trans).priv);
3928 break;
3929 }
3930 kfree(trans);
3931 }
3932
3933 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
3934 {
3935 struct nft_trans *trans, *next;
3936 struct nft_trans_elem *te;
3937
3938 /* Bump generation counter, invalidate any dump in progress */
3939 while (++net->nft.base_seq == 0);
3940
3941 /* A new generation has just started */
3942 net->nft.gencursor = nft_gencursor_next(net);
3943
3944 /* Make sure all packets have left the previous generation before
3945 * purging old rules.
3946 */
3947 synchronize_rcu();
3948
3949 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3950 switch (trans->msg_type) {
3951 case NFT_MSG_NEWTABLE:
3952 if (nft_trans_table_update(trans)) {
3953 if (!nft_trans_table_enable(trans)) {
3954 nf_tables_table_disable(trans->ctx.afi,
3955 trans->ctx.table);
3956 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3957 }
3958 } else {
3959 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3960 }
3961 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
3962 nft_trans_destroy(trans);
3963 break;
3964 case NFT_MSG_DELTABLE:
3965 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
3966 break;
3967 case NFT_MSG_NEWCHAIN:
3968 if (nft_trans_chain_update(trans))
3969 nft_chain_commit_update(trans);
3970 else
3971 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
3972
3973 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
3974 nft_trans_destroy(trans);
3975 break;
3976 case NFT_MSG_DELCHAIN:
3977 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
3978 nf_tables_unregister_hooks(trans->ctx.table,
3979 trans->ctx.chain,
3980 trans->ctx.afi->nops);
3981 break;
3982 case NFT_MSG_NEWRULE:
3983 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3984 nf_tables_rule_notify(&trans->ctx,
3985 nft_trans_rule(trans),
3986 NFT_MSG_NEWRULE);
3987 nft_trans_destroy(trans);
3988 break;
3989 case NFT_MSG_DELRULE:
3990 list_del_rcu(&nft_trans_rule(trans)->list);
3991 nf_tables_rule_notify(&trans->ctx,
3992 nft_trans_rule(trans),
3993 NFT_MSG_DELRULE);
3994 break;
3995 case NFT_MSG_NEWSET:
3996 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
3997 /* This avoids hitting -EBUSY when deleting the table
3998 * from the transaction.
3999 */
4000 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4001 !list_empty(&nft_trans_set(trans)->bindings))
4002 trans->ctx.table->use--;
4003
4004 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4005 NFT_MSG_NEWSET, GFP_KERNEL);
4006 nft_trans_destroy(trans);
4007 break;
4008 case NFT_MSG_DELSET:
4009 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4010 NFT_MSG_DELSET, GFP_KERNEL);
4011 break;
4012 case NFT_MSG_NEWSETELEM:
4013 te = (struct nft_trans_elem *)trans->data;
4014
4015 te->set->ops->activate(te->set, &te->elem);
4016 nf_tables_setelem_notify(&trans->ctx, te->set,
4017 &te->elem,
4018 NFT_MSG_NEWSETELEM, 0);
4019 nft_trans_destroy(trans);
4020 break;
4021 case NFT_MSG_DELSETELEM:
4022 te = (struct nft_trans_elem *)trans->data;
4023
4024 nf_tables_setelem_notify(&trans->ctx, te->set,
4025 &te->elem,
4026 NFT_MSG_DELSETELEM, 0);
4027 te->set->ops->remove(te->set, &te->elem);
4028 atomic_dec(&te->set->nelems);
4029 te->set->ndeact--;
4030 break;
4031 }
4032 }
4033
4034 synchronize_rcu();
4035
4036 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4037 list_del(&trans->list);
4038 nf_tables_commit_release(trans);
4039 }
4040
4041 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
4042
4043 return 0;
4044 }
4045
4046 static void nf_tables_abort_release(struct nft_trans *trans)
4047 {
4048 switch (trans->msg_type) {
4049 case NFT_MSG_NEWTABLE:
4050 nf_tables_table_destroy(&trans->ctx);
4051 break;
4052 case NFT_MSG_NEWCHAIN:
4053 nf_tables_chain_destroy(trans->ctx.chain);
4054 break;
4055 case NFT_MSG_NEWRULE:
4056 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4057 break;
4058 case NFT_MSG_NEWSET:
4059 nft_set_destroy(nft_trans_set(trans));
4060 break;
4061 case NFT_MSG_NEWSETELEM:
4062 nft_set_elem_destroy(nft_trans_elem_set(trans),
4063 nft_trans_elem(trans).priv);
4064 break;
4065 }
4066 kfree(trans);
4067 }
4068
4069 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
4070 {
4071 struct nft_trans *trans, *next;
4072 struct nft_trans_elem *te;
4073
4074 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4075 list) {
4076 switch (trans->msg_type) {
4077 case NFT_MSG_NEWTABLE:
4078 if (nft_trans_table_update(trans)) {
4079 if (nft_trans_table_enable(trans)) {
4080 nf_tables_table_disable(trans->ctx.afi,
4081 trans->ctx.table);
4082 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4083 }
4084 nft_trans_destroy(trans);
4085 } else {
4086 list_del_rcu(&trans->ctx.table->list);
4087 }
4088 break;
4089 case NFT_MSG_DELTABLE:
4090 list_add_tail_rcu(&trans->ctx.table->list,
4091 &trans->ctx.afi->tables);
4092 nft_trans_destroy(trans);
4093 break;
4094 case NFT_MSG_NEWCHAIN:
4095 if (nft_trans_chain_update(trans)) {
4096 free_percpu(nft_trans_chain_stats(trans));
4097
4098 nft_trans_destroy(trans);
4099 } else {
4100 trans->ctx.table->use--;
4101 list_del_rcu(&trans->ctx.chain->list);
4102 nf_tables_unregister_hooks(trans->ctx.table,
4103 trans->ctx.chain,
4104 trans->ctx.afi->nops);
4105 }
4106 break;
4107 case NFT_MSG_DELCHAIN:
4108 trans->ctx.table->use++;
4109 list_add_tail_rcu(&trans->ctx.chain->list,
4110 &trans->ctx.table->chains);
4111 nft_trans_destroy(trans);
4112 break;
4113 case NFT_MSG_NEWRULE:
4114 trans->ctx.chain->use--;
4115 list_del_rcu(&nft_trans_rule(trans)->list);
4116 break;
4117 case NFT_MSG_DELRULE:
4118 trans->ctx.chain->use++;
4119 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
4120 nft_trans_destroy(trans);
4121 break;
4122 case NFT_MSG_NEWSET:
4123 trans->ctx.table->use--;
4124 list_del_rcu(&nft_trans_set(trans)->list);
4125 break;
4126 case NFT_MSG_DELSET:
4127 trans->ctx.table->use++;
4128 list_add_tail_rcu(&nft_trans_set(trans)->list,
4129 &trans->ctx.table->sets);
4130 nft_trans_destroy(trans);
4131 break;
4132 case NFT_MSG_NEWSETELEM:
4133 te = (struct nft_trans_elem *)trans->data;
4134
4135 te->set->ops->remove(te->set, &te->elem);
4136 atomic_dec(&te->set->nelems);
4137 break;
4138 case NFT_MSG_DELSETELEM:
4139 te = (struct nft_trans_elem *)trans->data;
4140
4141 te->set->ops->activate(te->set, &te->elem);
4142 te->set->ndeact--;
4143
4144 nft_trans_destroy(trans);
4145 break;
4146 }
4147 }
4148
4149 synchronize_rcu();
4150
4151 list_for_each_entry_safe_reverse(trans, next,
4152 &net->nft.commit_list, list) {
4153 list_del(&trans->list);
4154 nf_tables_abort_release(trans);
4155 }
4156
4157 return 0;
4158 }
4159
4160 static const struct nfnetlink_subsystem nf_tables_subsys = {
4161 .name = "nf_tables",
4162 .subsys_id = NFNL_SUBSYS_NFTABLES,
4163 .cb_count = NFT_MSG_MAX,
4164 .cb = nf_tables_cb,
4165 .commit = nf_tables_commit,
4166 .abort = nf_tables_abort,
4167 };
4168
4169 int nft_chain_validate_dependency(const struct nft_chain *chain,
4170 enum nft_chain_type type)
4171 {
4172 const struct nft_base_chain *basechain;
4173
4174 if (chain->flags & NFT_BASE_CHAIN) {
4175 basechain = nft_base_chain(chain);
4176 if (basechain->type->type != type)
4177 return -EOPNOTSUPP;
4178 }
4179 return 0;
4180 }
4181 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
4182
4183 int nft_chain_validate_hooks(const struct nft_chain *chain,
4184 unsigned int hook_flags)
4185 {
4186 struct nft_base_chain *basechain;
4187
4188 if (chain->flags & NFT_BASE_CHAIN) {
4189 basechain = nft_base_chain(chain);
4190
4191 if ((1 << basechain->ops[0].hooknum) & hook_flags)
4192 return 0;
4193
4194 return -EOPNOTSUPP;
4195 }
4196
4197 return 0;
4198 }
4199 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
4200
4201 /*
4202 * Loop detection - walk through the ruleset beginning at the destination chain
4203 * of a new jump until either the source chain is reached (loop) or all
4204 * reachable chains have been traversed.
4205 *
4206 * The loop check is performed whenever a new jump verdict is added to an
4207 * expression or verdict map or a verdict map is bound to a new chain.
4208 */
4209
4210 static int nf_tables_check_loops(const struct nft_ctx *ctx,
4211 const struct nft_chain *chain);
4212
4213 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
4214 const struct nft_set *set,
4215 const struct nft_set_iter *iter,
4216 const struct nft_set_elem *elem)
4217 {
4218 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4219 const struct nft_data *data;
4220
4221 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4222 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
4223 return 0;
4224
4225 data = nft_set_ext_data(ext);
4226 switch (data->verdict.code) {
4227 case NFT_JUMP:
4228 case NFT_GOTO:
4229 return nf_tables_check_loops(ctx, data->verdict.chain);
4230 default:
4231 return 0;
4232 }
4233 }
4234
4235 static int nf_tables_check_loops(const struct nft_ctx *ctx,
4236 const struct nft_chain *chain)
4237 {
4238 const struct nft_rule *rule;
4239 const struct nft_expr *expr, *last;
4240 const struct nft_set *set;
4241 struct nft_set_binding *binding;
4242 struct nft_set_iter iter;
4243
4244 if (ctx->chain == chain)
4245 return -ELOOP;
4246
4247 list_for_each_entry(rule, &chain->rules, list) {
4248 nft_rule_for_each_expr(expr, last, rule) {
4249 const struct nft_data *data = NULL;
4250 int err;
4251
4252 if (!expr->ops->validate)
4253 continue;
4254
4255 err = expr->ops->validate(ctx, expr, &data);
4256 if (err < 0)
4257 return err;
4258
4259 if (data == NULL)
4260 continue;
4261
4262 switch (data->verdict.code) {
4263 case NFT_JUMP:
4264 case NFT_GOTO:
4265 err = nf_tables_check_loops(ctx,
4266 data->verdict.chain);
4267 if (err < 0)
4268 return err;
4269 default:
4270 break;
4271 }
4272 }
4273 }
4274
4275 list_for_each_entry(set, &ctx->table->sets, list) {
4276 if (!(set->flags & NFT_SET_MAP) ||
4277 set->dtype != NFT_DATA_VERDICT)
4278 continue;
4279
4280 list_for_each_entry(binding, &set->bindings, list) {
4281 if (!(binding->flags & NFT_SET_MAP) ||
4282 binding->chain != chain)
4283 continue;
4284
4285 iter.skip = 0;
4286 iter.count = 0;
4287 iter.err = 0;
4288 iter.fn = nf_tables_loop_check_setelem;
4289
4290 set->ops->walk(ctx, set, &iter);
4291 if (iter.err < 0)
4292 return iter.err;
4293 }
4294 }
4295
4296 return 0;
4297 }
4298
4299 /**
4300 * nft_parse_register - parse a register value from a netlink attribute
4301 *
4302 * @attr: netlink attribute
4303 *
4304 * Parse and translate a register value from a netlink attribute.
4305 * Registers used to be 128 bit wide, these register numbers will be
4306 * mapped to the corresponding 32 bit register numbers.
4307 */
4308 unsigned int nft_parse_register(const struct nlattr *attr)
4309 {
4310 unsigned int reg;
4311
4312 reg = ntohl(nla_get_be32(attr));
4313 switch (reg) {
4314 case NFT_REG_VERDICT...NFT_REG_4:
4315 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
4316 default:
4317 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
4318 }
4319 }
4320 EXPORT_SYMBOL_GPL(nft_parse_register);
4321
4322 /**
4323 * nft_dump_register - dump a register value to a netlink attribute
4324 *
4325 * @skb: socket buffer
4326 * @attr: attribute number
4327 * @reg: register number
4328 *
4329 * Construct a netlink attribute containing the register number. For
4330 * compatibility reasons, register numbers being a multiple of 4 are
4331 * translated to the corresponding 128 bit register numbers.
4332 */
4333 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
4334 {
4335 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
4336 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
4337 else
4338 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
4339
4340 return nla_put_be32(skb, attr, htonl(reg));
4341 }
4342 EXPORT_SYMBOL_GPL(nft_dump_register);
4343
4344 /**
4345 * nft_validate_register_load - validate a load from a register
4346 *
4347 * @reg: the register number
4348 * @len: the length of the data
4349 *
4350 * Validate that the input register is one of the general purpose
4351 * registers and that the length of the load is within the bounds.
4352 */
4353 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
4354 {
4355 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
4356 return -EINVAL;
4357 if (len == 0)
4358 return -EINVAL;
4359 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
4360 return -ERANGE;
4361
4362 return 0;
4363 }
4364 EXPORT_SYMBOL_GPL(nft_validate_register_load);
4365
4366 /**
4367 * nft_validate_register_store - validate an expressions' register store
4368 *
4369 * @ctx: context of the expression performing the load
4370 * @reg: the destination register number
4371 * @data: the data to load
4372 * @type: the data type
4373 * @len: the length of the data
4374 *
4375 * Validate that a data load uses the appropriate data type for
4376 * the destination register and the length is within the bounds.
4377 * A value of NULL for the data means that its runtime gathered
4378 * data.
4379 */
4380 int nft_validate_register_store(const struct nft_ctx *ctx,
4381 enum nft_registers reg,
4382 const struct nft_data *data,
4383 enum nft_data_types type, unsigned int len)
4384 {
4385 int err;
4386
4387 switch (reg) {
4388 case NFT_REG_VERDICT:
4389 if (type != NFT_DATA_VERDICT)
4390 return -EINVAL;
4391
4392 if (data != NULL &&
4393 (data->verdict.code == NFT_GOTO ||
4394 data->verdict.code == NFT_JUMP)) {
4395 err = nf_tables_check_loops(ctx, data->verdict.chain);
4396 if (err < 0)
4397 return err;
4398
4399 if (ctx->chain->level + 1 >
4400 data->verdict.chain->level) {
4401 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
4402 return -EMLINK;
4403 data->verdict.chain->level = ctx->chain->level + 1;
4404 }
4405 }
4406
4407 return 0;
4408 default:
4409 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
4410 return -EINVAL;
4411 if (len == 0)
4412 return -EINVAL;
4413 if (reg * NFT_REG32_SIZE + len >
4414 FIELD_SIZEOF(struct nft_regs, data))
4415 return -ERANGE;
4416
4417 if (data != NULL && type != NFT_DATA_VALUE)
4418 return -EINVAL;
4419 return 0;
4420 }
4421 }
4422 EXPORT_SYMBOL_GPL(nft_validate_register_store);
4423
4424 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
4425 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
4426 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
4427 .len = NFT_CHAIN_MAXNAMELEN - 1 },
4428 };
4429
4430 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
4431 struct nft_data_desc *desc, const struct nlattr *nla)
4432 {
4433 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
4434 struct nft_chain *chain;
4435 int err;
4436
4437 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
4438 if (err < 0)
4439 return err;
4440
4441 if (!tb[NFTA_VERDICT_CODE])
4442 return -EINVAL;
4443 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
4444
4445 switch (data->verdict.code) {
4446 default:
4447 switch (data->verdict.code & NF_VERDICT_MASK) {
4448 case NF_ACCEPT:
4449 case NF_DROP:
4450 case NF_QUEUE:
4451 break;
4452 default:
4453 return -EINVAL;
4454 }
4455 /* fall through */
4456 case NFT_CONTINUE:
4457 case NFT_BREAK:
4458 case NFT_RETURN:
4459 break;
4460 case NFT_JUMP:
4461 case NFT_GOTO:
4462 if (!tb[NFTA_VERDICT_CHAIN])
4463 return -EINVAL;
4464 chain = nf_tables_chain_lookup(ctx->table,
4465 tb[NFTA_VERDICT_CHAIN]);
4466 if (IS_ERR(chain))
4467 return PTR_ERR(chain);
4468 if (chain->flags & NFT_BASE_CHAIN)
4469 return -EOPNOTSUPP;
4470
4471 chain->use++;
4472 data->verdict.chain = chain;
4473 break;
4474 }
4475
4476 desc->len = sizeof(data->verdict);
4477 desc->type = NFT_DATA_VERDICT;
4478 return 0;
4479 }
4480
4481 static void nft_verdict_uninit(const struct nft_data *data)
4482 {
4483 switch (data->verdict.code) {
4484 case NFT_JUMP:
4485 case NFT_GOTO:
4486 data->verdict.chain->use--;
4487 break;
4488 }
4489 }
4490
4491 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
4492 {
4493 struct nlattr *nest;
4494
4495 nest = nla_nest_start(skb, type);
4496 if (!nest)
4497 goto nla_put_failure;
4498
4499 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
4500 goto nla_put_failure;
4501
4502 switch (v->code) {
4503 case NFT_JUMP:
4504 case NFT_GOTO:
4505 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
4506 v->chain->name))
4507 goto nla_put_failure;
4508 }
4509 nla_nest_end(skb, nest);
4510 return 0;
4511
4512 nla_put_failure:
4513 return -1;
4514 }
4515
4516 static int nft_value_init(const struct nft_ctx *ctx,
4517 struct nft_data *data, unsigned int size,
4518 struct nft_data_desc *desc, const struct nlattr *nla)
4519 {
4520 unsigned int len;
4521
4522 len = nla_len(nla);
4523 if (len == 0)
4524 return -EINVAL;
4525 if (len > size)
4526 return -EOVERFLOW;
4527
4528 nla_memcpy(data->data, nla, len);
4529 desc->type = NFT_DATA_VALUE;
4530 desc->len = len;
4531 return 0;
4532 }
4533
4534 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
4535 unsigned int len)
4536 {
4537 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
4538 }
4539
4540 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
4541 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
4542 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
4543 };
4544
4545 /**
4546 * nft_data_init - parse nf_tables data netlink attributes
4547 *
4548 * @ctx: context of the expression using the data
4549 * @data: destination struct nft_data
4550 * @size: maximum data length
4551 * @desc: data description
4552 * @nla: netlink attribute containing data
4553 *
4554 * Parse the netlink data attributes and initialize a struct nft_data.
4555 * The type and length of data are returned in the data description.
4556 *
4557 * The caller can indicate that it only wants to accept data of type
4558 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4559 */
4560 int nft_data_init(const struct nft_ctx *ctx,
4561 struct nft_data *data, unsigned int size,
4562 struct nft_data_desc *desc, const struct nlattr *nla)
4563 {
4564 struct nlattr *tb[NFTA_DATA_MAX + 1];
4565 int err;
4566
4567 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
4568 if (err < 0)
4569 return err;
4570
4571 if (tb[NFTA_DATA_VALUE])
4572 return nft_value_init(ctx, data, size, desc,
4573 tb[NFTA_DATA_VALUE]);
4574 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
4575 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
4576 return -EINVAL;
4577 }
4578 EXPORT_SYMBOL_GPL(nft_data_init);
4579
4580 /**
4581 * nft_data_uninit - release a nft_data item
4582 *
4583 * @data: struct nft_data to release
4584 * @type: type of data
4585 *
4586 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4587 * all others need to be released by calling this function.
4588 */
4589 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
4590 {
4591 if (type < NFT_DATA_VERDICT)
4592 return;
4593 switch (type) {
4594 case NFT_DATA_VERDICT:
4595 return nft_verdict_uninit(data);
4596 default:
4597 WARN_ON(1);
4598 }
4599 }
4600 EXPORT_SYMBOL_GPL(nft_data_uninit);
4601
4602 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4603 enum nft_data_types type, unsigned int len)
4604 {
4605 struct nlattr *nest;
4606 int err;
4607
4608 nest = nla_nest_start(skb, attr);
4609 if (nest == NULL)
4610 return -1;
4611
4612 switch (type) {
4613 case NFT_DATA_VALUE:
4614 err = nft_value_dump(skb, data, len);
4615 break;
4616 case NFT_DATA_VERDICT:
4617 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
4618 break;
4619 default:
4620 err = -EINVAL;
4621 WARN_ON(1);
4622 }
4623
4624 nla_nest_end(skb, nest);
4625 return err;
4626 }
4627 EXPORT_SYMBOL_GPL(nft_data_dump);
4628
4629 static int __net_init nf_tables_init_net(struct net *net)
4630 {
4631 INIT_LIST_HEAD(&net->nft.af_info);
4632 INIT_LIST_HEAD(&net->nft.commit_list);
4633 net->nft.base_seq = 1;
4634 return 0;
4635 }
4636
4637 int __nft_release_basechain(struct nft_ctx *ctx)
4638 {
4639 struct nft_rule *rule, *nr;
4640
4641 BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
4642
4643 nf_tables_unregister_hooks(ctx->chain->table, ctx->chain,
4644 ctx->afi->nops);
4645 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
4646 list_del(&rule->list);
4647 ctx->chain->use--;
4648 nf_tables_rule_destroy(ctx, rule);
4649 }
4650 list_del(&ctx->chain->list);
4651 ctx->table->use--;
4652 nf_tables_chain_destroy(ctx->chain);
4653
4654 return 0;
4655 }
4656 EXPORT_SYMBOL_GPL(__nft_release_basechain);
4657
4658 /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
4659 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
4660 {
4661 struct nft_table *table, *nt;
4662 struct nft_chain *chain, *nc;
4663 struct nft_rule *rule, *nr;
4664 struct nft_set *set, *ns;
4665 struct nft_ctx ctx = {
4666 .net = net,
4667 .afi = afi,
4668 };
4669
4670 list_for_each_entry_safe(table, nt, &afi->tables, list) {
4671 list_for_each_entry(chain, &table->chains, list)
4672 nf_tables_unregister_hooks(table, chain, afi->nops);
4673 /* No packets are walking on these chains anymore. */
4674 ctx.table = table;
4675 list_for_each_entry(chain, &table->chains, list) {
4676 ctx.chain = chain;
4677 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
4678 list_del(&rule->list);
4679 chain->use--;
4680 nf_tables_rule_destroy(&ctx, rule);
4681 }
4682 }
4683 list_for_each_entry_safe(set, ns, &table->sets, list) {
4684 list_del(&set->list);
4685 table->use--;
4686 nft_set_destroy(set);
4687 }
4688 list_for_each_entry_safe(chain, nc, &table->chains, list) {
4689 list_del(&chain->list);
4690 table->use--;
4691 nf_tables_chain_destroy(chain);
4692 }
4693 list_del(&table->list);
4694 nf_tables_table_destroy(&ctx);
4695 }
4696 }
4697
4698 static struct pernet_operations nf_tables_net_ops = {
4699 .init = nf_tables_init_net,
4700 };
4701
4702 static int __init nf_tables_module_init(void)
4703 {
4704 int err;
4705
4706 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4707 GFP_KERNEL);
4708 if (info == NULL) {
4709 err = -ENOMEM;
4710 goto err1;
4711 }
4712
4713 err = nf_tables_core_module_init();
4714 if (err < 0)
4715 goto err2;
4716
4717 err = nfnetlink_subsys_register(&nf_tables_subsys);
4718 if (err < 0)
4719 goto err3;
4720
4721 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4722 return register_pernet_subsys(&nf_tables_net_ops);
4723 err3:
4724 nf_tables_core_module_exit();
4725 err2:
4726 kfree(info);
4727 err1:
4728 return err;
4729 }
4730
4731 static void __exit nf_tables_module_exit(void)
4732 {
4733 unregister_pernet_subsys(&nf_tables_net_ops);
4734 nfnetlink_subsys_unregister(&nf_tables_subsys);
4735 rcu_barrier();
4736 nf_tables_core_module_exit();
4737 kfree(info);
4738 }
4739
4740 module_init(nf_tables_module_init);
4741 module_exit(nf_tables_module_exit);
4742
4743 MODULE_LICENSE("GPL");
4744 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4745 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
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