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Merge branch 'for-linus-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/mason...
[mirror_ubuntu-zesty-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 static LIST_HEAD(nf_tables_objects);
26
27 /**
28 * nft_register_afinfo - register nf_tables address family info
29 *
30 * @afi: address family info to register
31 *
32 * Register the address family for use with nf_tables. Returns zero on
33 * success or a negative errno code otherwise.
34 */
35 int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
36 {
37 INIT_LIST_HEAD(&afi->tables);
38 nfnl_lock(NFNL_SUBSYS_NFTABLES);
39 list_add_tail_rcu(&afi->list, &net->nft.af_info);
40 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
41 return 0;
42 }
43 EXPORT_SYMBOL_GPL(nft_register_afinfo);
44
45 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi);
46
47 /**
48 * nft_unregister_afinfo - unregister nf_tables address family info
49 *
50 * @afi: address family info to unregister
51 *
52 * Unregister the address family for use with nf_tables.
53 */
54 void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi)
55 {
56 nfnl_lock(NFNL_SUBSYS_NFTABLES);
57 __nft_release_afinfo(net, afi);
58 list_del_rcu(&afi->list);
59 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
60 }
61 EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
62
63 static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
64 {
65 struct nft_af_info *afi;
66
67 list_for_each_entry(afi, &net->nft.af_info, list) {
68 if (afi->family == family)
69 return afi;
70 }
71 return NULL;
72 }
73
74 static struct nft_af_info *
75 nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
76 {
77 struct nft_af_info *afi;
78
79 afi = nft_afinfo_lookup(net, family);
80 if (afi != NULL)
81 return afi;
82 #ifdef CONFIG_MODULES
83 if (autoload) {
84 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
85 request_module("nft-afinfo-%u", family);
86 nfnl_lock(NFNL_SUBSYS_NFTABLES);
87 afi = nft_afinfo_lookup(net, family);
88 if (afi != NULL)
89 return ERR_PTR(-EAGAIN);
90 }
91 #endif
92 return ERR_PTR(-EAFNOSUPPORT);
93 }
94
95 static void nft_ctx_init(struct nft_ctx *ctx,
96 struct net *net,
97 const struct sk_buff *skb,
98 const struct nlmsghdr *nlh,
99 struct nft_af_info *afi,
100 struct nft_table *table,
101 struct nft_chain *chain,
102 const struct nlattr * const *nla)
103 {
104 ctx->net = net;
105 ctx->afi = afi;
106 ctx->table = table;
107 ctx->chain = chain;
108 ctx->nla = nla;
109 ctx->portid = NETLINK_CB(skb).portid;
110 ctx->report = nlmsg_report(nlh);
111 ctx->seq = nlh->nlmsg_seq;
112 }
113
114 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
115 int msg_type, u32 size, gfp_t gfp)
116 {
117 struct nft_trans *trans;
118
119 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
120 if (trans == NULL)
121 return NULL;
122
123 trans->msg_type = msg_type;
124 trans->ctx = *ctx;
125
126 return trans;
127 }
128
129 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
130 int msg_type, u32 size)
131 {
132 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
133 }
134
135 static void nft_trans_destroy(struct nft_trans *trans)
136 {
137 list_del(&trans->list);
138 kfree(trans);
139 }
140
141 static int nf_tables_register_hooks(struct net *net,
142 const struct nft_table *table,
143 struct nft_chain *chain,
144 unsigned int hook_nops)
145 {
146 if (table->flags & NFT_TABLE_F_DORMANT ||
147 !(chain->flags & NFT_BASE_CHAIN))
148 return 0;
149
150 return nf_register_net_hooks(net, nft_base_chain(chain)->ops,
151 hook_nops);
152 }
153
154 static void nf_tables_unregister_hooks(struct net *net,
155 const struct nft_table *table,
156 struct nft_chain *chain,
157 unsigned int hook_nops)
158 {
159 if (table->flags & NFT_TABLE_F_DORMANT ||
160 !(chain->flags & NFT_BASE_CHAIN))
161 return;
162
163 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops, hook_nops);
164 }
165
166 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
167 {
168 struct nft_trans *trans;
169
170 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
171 if (trans == NULL)
172 return -ENOMEM;
173
174 if (msg_type == NFT_MSG_NEWTABLE)
175 nft_activate_next(ctx->net, ctx->table);
176
177 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
178 return 0;
179 }
180
181 static int nft_deltable(struct nft_ctx *ctx)
182 {
183 int err;
184
185 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
186 if (err < 0)
187 return err;
188
189 nft_deactivate_next(ctx->net, ctx->table);
190 return err;
191 }
192
193 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
194 {
195 struct nft_trans *trans;
196
197 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
198 if (trans == NULL)
199 return -ENOMEM;
200
201 if (msg_type == NFT_MSG_NEWCHAIN)
202 nft_activate_next(ctx->net, ctx->chain);
203
204 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
205 return 0;
206 }
207
208 static int nft_delchain(struct nft_ctx *ctx)
209 {
210 int err;
211
212 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
213 if (err < 0)
214 return err;
215
216 ctx->table->use--;
217 nft_deactivate_next(ctx->net, ctx->chain);
218
219 return err;
220 }
221
222 static int
223 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
224 {
225 /* You cannot delete the same rule twice */
226 if (nft_is_active_next(ctx->net, rule)) {
227 nft_deactivate_next(ctx->net, rule);
228 ctx->chain->use--;
229 return 0;
230 }
231 return -ENOENT;
232 }
233
234 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
235 struct nft_rule *rule)
236 {
237 struct nft_trans *trans;
238
239 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
240 if (trans == NULL)
241 return NULL;
242
243 nft_trans_rule(trans) = rule;
244 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
245
246 return trans;
247 }
248
249 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
250 {
251 struct nft_trans *trans;
252 int err;
253
254 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
255 if (trans == NULL)
256 return -ENOMEM;
257
258 err = nf_tables_delrule_deactivate(ctx, rule);
259 if (err < 0) {
260 nft_trans_destroy(trans);
261 return err;
262 }
263
264 return 0;
265 }
266
267 static int nft_delrule_by_chain(struct nft_ctx *ctx)
268 {
269 struct nft_rule *rule;
270 int err;
271
272 list_for_each_entry(rule, &ctx->chain->rules, list) {
273 err = nft_delrule(ctx, rule);
274 if (err < 0)
275 return err;
276 }
277 return 0;
278 }
279
280 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
281 struct nft_set *set)
282 {
283 struct nft_trans *trans;
284
285 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
286 if (trans == NULL)
287 return -ENOMEM;
288
289 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
290 nft_trans_set_id(trans) =
291 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
292 nft_activate_next(ctx->net, set);
293 }
294 nft_trans_set(trans) = set;
295 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
296
297 return 0;
298 }
299
300 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
301 {
302 int err;
303
304 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
305 if (err < 0)
306 return err;
307
308 nft_deactivate_next(ctx->net, set);
309 ctx->table->use--;
310
311 return err;
312 }
313
314 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
315 struct nft_object *obj)
316 {
317 struct nft_trans *trans;
318
319 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
320 if (trans == NULL)
321 return -ENOMEM;
322
323 if (msg_type == NFT_MSG_NEWOBJ)
324 nft_activate_next(ctx->net, obj);
325
326 nft_trans_obj(trans) = obj;
327 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
328
329 return 0;
330 }
331
332 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
333 {
334 int err;
335
336 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
337 if (err < 0)
338 return err;
339
340 nft_deactivate_next(ctx->net, obj);
341 ctx->table->use--;
342
343 return err;
344 }
345
346 /*
347 * Tables
348 */
349
350 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
351 const struct nlattr *nla,
352 u8 genmask)
353 {
354 struct nft_table *table;
355
356 list_for_each_entry(table, &afi->tables, list) {
357 if (!nla_strcmp(nla, table->name) &&
358 nft_active_genmask(table, genmask))
359 return table;
360 }
361 return NULL;
362 }
363
364 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
365 const struct nlattr *nla,
366 u8 genmask)
367 {
368 struct nft_table *table;
369
370 if (nla == NULL)
371 return ERR_PTR(-EINVAL);
372
373 table = nft_table_lookup(afi, nla, genmask);
374 if (table != NULL)
375 return table;
376
377 return ERR_PTR(-ENOENT);
378 }
379
380 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
381 {
382 return ++table->hgenerator;
383 }
384
385 static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
386
387 static const struct nf_chain_type *
388 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
389 {
390 int i;
391
392 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
393 if (chain_type[family][i] != NULL &&
394 !nla_strcmp(nla, chain_type[family][i]->name))
395 return chain_type[family][i];
396 }
397 return NULL;
398 }
399
400 static const struct nf_chain_type *
401 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
402 const struct nlattr *nla,
403 bool autoload)
404 {
405 const struct nf_chain_type *type;
406
407 type = __nf_tables_chain_type_lookup(afi->family, nla);
408 if (type != NULL)
409 return type;
410 #ifdef CONFIG_MODULES
411 if (autoload) {
412 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
413 request_module("nft-chain-%u-%.*s", afi->family,
414 nla_len(nla), (const char *)nla_data(nla));
415 nfnl_lock(NFNL_SUBSYS_NFTABLES);
416 type = __nf_tables_chain_type_lookup(afi->family, nla);
417 if (type != NULL)
418 return ERR_PTR(-EAGAIN);
419 }
420 #endif
421 return ERR_PTR(-ENOENT);
422 }
423
424 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
425 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
426 .len = NFT_TABLE_MAXNAMELEN - 1 },
427 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
428 };
429
430 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
431 u32 portid, u32 seq, int event, u32 flags,
432 int family, const struct nft_table *table)
433 {
434 struct nlmsghdr *nlh;
435 struct nfgenmsg *nfmsg;
436
437 event |= NFNL_SUBSYS_NFTABLES << 8;
438 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
439 if (nlh == NULL)
440 goto nla_put_failure;
441
442 nfmsg = nlmsg_data(nlh);
443 nfmsg->nfgen_family = family;
444 nfmsg->version = NFNETLINK_V0;
445 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
446
447 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
448 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
449 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
450 goto nla_put_failure;
451
452 nlmsg_end(skb, nlh);
453 return 0;
454
455 nla_put_failure:
456 nlmsg_trim(skb, nlh);
457 return -1;
458 }
459
460 static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
461 {
462 struct sk_buff *skb;
463 int err;
464
465 if (!ctx->report &&
466 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
467 return 0;
468
469 err = -ENOBUFS;
470 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
471 if (skb == NULL)
472 goto err;
473
474 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
475 event, 0, ctx->afi->family, ctx->table);
476 if (err < 0) {
477 kfree_skb(skb);
478 goto err;
479 }
480
481 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
482 ctx->report, GFP_KERNEL);
483 err:
484 if (err < 0) {
485 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
486 err);
487 }
488 return err;
489 }
490
491 static int nf_tables_dump_tables(struct sk_buff *skb,
492 struct netlink_callback *cb)
493 {
494 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
495 const struct nft_af_info *afi;
496 const struct nft_table *table;
497 unsigned int idx = 0, s_idx = cb->args[0];
498 struct net *net = sock_net(skb->sk);
499 int family = nfmsg->nfgen_family;
500
501 rcu_read_lock();
502 cb->seq = net->nft.base_seq;
503
504 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
505 if (family != NFPROTO_UNSPEC && family != afi->family)
506 continue;
507
508 list_for_each_entry_rcu(table, &afi->tables, list) {
509 if (idx < s_idx)
510 goto cont;
511 if (idx > s_idx)
512 memset(&cb->args[1], 0,
513 sizeof(cb->args) - sizeof(cb->args[0]));
514 if (!nft_is_active(net, table))
515 continue;
516 if (nf_tables_fill_table_info(skb, net,
517 NETLINK_CB(cb->skb).portid,
518 cb->nlh->nlmsg_seq,
519 NFT_MSG_NEWTABLE,
520 NLM_F_MULTI,
521 afi->family, table) < 0)
522 goto done;
523
524 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
525 cont:
526 idx++;
527 }
528 }
529 done:
530 rcu_read_unlock();
531 cb->args[0] = idx;
532 return skb->len;
533 }
534
535 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
536 struct sk_buff *skb, const struct nlmsghdr *nlh,
537 const struct nlattr * const nla[])
538 {
539 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
540 u8 genmask = nft_genmask_cur(net);
541 const struct nft_af_info *afi;
542 const struct nft_table *table;
543 struct sk_buff *skb2;
544 int family = nfmsg->nfgen_family;
545 int err;
546
547 if (nlh->nlmsg_flags & NLM_F_DUMP) {
548 struct netlink_dump_control c = {
549 .dump = nf_tables_dump_tables,
550 };
551 return netlink_dump_start(nlsk, skb, nlh, &c);
552 }
553
554 afi = nf_tables_afinfo_lookup(net, family, false);
555 if (IS_ERR(afi))
556 return PTR_ERR(afi);
557
558 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
559 if (IS_ERR(table))
560 return PTR_ERR(table);
561
562 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
563 if (!skb2)
564 return -ENOMEM;
565
566 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
567 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
568 family, table);
569 if (err < 0)
570 goto err;
571
572 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
573
574 err:
575 kfree_skb(skb2);
576 return err;
577 }
578
579 static int nf_tables_table_enable(struct net *net,
580 const struct nft_af_info *afi,
581 struct nft_table *table)
582 {
583 struct nft_chain *chain;
584 int err, i = 0;
585
586 list_for_each_entry(chain, &table->chains, list) {
587 if (!nft_is_active_next(net, chain))
588 continue;
589 if (!(chain->flags & NFT_BASE_CHAIN))
590 continue;
591
592 err = nf_register_net_hooks(net, nft_base_chain(chain)->ops,
593 afi->nops);
594 if (err < 0)
595 goto err;
596
597 i++;
598 }
599 return 0;
600 err:
601 list_for_each_entry(chain, &table->chains, list) {
602 if (!nft_is_active_next(net, chain))
603 continue;
604 if (!(chain->flags & NFT_BASE_CHAIN))
605 continue;
606
607 if (i-- <= 0)
608 break;
609
610 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
611 afi->nops);
612 }
613 return err;
614 }
615
616 static void nf_tables_table_disable(struct net *net,
617 const struct nft_af_info *afi,
618 struct nft_table *table)
619 {
620 struct nft_chain *chain;
621
622 list_for_each_entry(chain, &table->chains, list) {
623 if (!nft_is_active_next(net, chain))
624 continue;
625 if (!(chain->flags & NFT_BASE_CHAIN))
626 continue;
627
628 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
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->net, 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 u8 genmask = nft_genmask_next(net);
682 const struct nlattr *name;
683 struct nft_af_info *afi;
684 struct nft_table *table;
685 int family = nfmsg->nfgen_family;
686 u32 flags = 0;
687 struct nft_ctx ctx;
688 int err;
689
690 afi = nf_tables_afinfo_lookup(net, family, true);
691 if (IS_ERR(afi))
692 return PTR_ERR(afi);
693
694 name = nla[NFTA_TABLE_NAME];
695 table = nf_tables_table_lookup(afi, name, genmask);
696 if (IS_ERR(table)) {
697 if (PTR_ERR(table) != -ENOENT)
698 return PTR_ERR(table);
699 table = NULL;
700 }
701
702 if (table != NULL) {
703 if (nlh->nlmsg_flags & NLM_F_EXCL)
704 return -EEXIST;
705 if (nlh->nlmsg_flags & NLM_F_REPLACE)
706 return -EOPNOTSUPP;
707
708 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
709 return nf_tables_updtable(&ctx);
710 }
711
712 if (nla[NFTA_TABLE_FLAGS]) {
713 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
714 if (flags & ~NFT_TABLE_F_DORMANT)
715 return -EINVAL;
716 }
717
718 err = -EAFNOSUPPORT;
719 if (!try_module_get(afi->owner))
720 goto err1;
721
722 err = -ENOMEM;
723 table = kzalloc(sizeof(*table), GFP_KERNEL);
724 if (table == NULL)
725 goto err2;
726
727 nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
728 INIT_LIST_HEAD(&table->chains);
729 INIT_LIST_HEAD(&table->sets);
730 INIT_LIST_HEAD(&table->objects);
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_object *obj, *ne;
753 struct nft_set *set, *ns;
754
755 list_for_each_entry(chain, &ctx->table->chains, list) {
756 if (!nft_is_active_next(ctx->net, chain))
757 continue;
758
759 ctx->chain = chain;
760
761 err = nft_delrule_by_chain(ctx);
762 if (err < 0)
763 goto out;
764 }
765
766 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
767 if (!nft_is_active_next(ctx->net, set))
768 continue;
769
770 if (set->flags & NFT_SET_ANONYMOUS &&
771 !list_empty(&set->bindings))
772 continue;
773
774 err = nft_delset(ctx, set);
775 if (err < 0)
776 goto out;
777 }
778
779 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
780 err = nft_delobj(ctx, obj);
781 if (err < 0)
782 goto out;
783 }
784
785 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
786 if (!nft_is_active_next(ctx->net, chain))
787 continue;
788
789 ctx->chain = chain;
790
791 err = nft_delchain(ctx);
792 if (err < 0)
793 goto out;
794 }
795
796 err = nft_deltable(ctx);
797 out:
798 return err;
799 }
800
801 static int nft_flush(struct nft_ctx *ctx, int family)
802 {
803 struct nft_af_info *afi;
804 struct nft_table *table, *nt;
805 const struct nlattr * const *nla = ctx->nla;
806 int err = 0;
807
808 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
809 if (family != AF_UNSPEC && afi->family != family)
810 continue;
811
812 ctx->afi = afi;
813 list_for_each_entry_safe(table, nt, &afi->tables, list) {
814 if (!nft_is_active_next(ctx->net, table))
815 continue;
816
817 if (nla[NFTA_TABLE_NAME] &&
818 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
819 continue;
820
821 ctx->table = table;
822
823 err = nft_flush_table(ctx);
824 if (err < 0)
825 goto out;
826 }
827 }
828 out:
829 return err;
830 }
831
832 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
833 struct sk_buff *skb, const struct nlmsghdr *nlh,
834 const struct nlattr * const nla[])
835 {
836 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
837 u8 genmask = nft_genmask_next(net);
838 struct nft_af_info *afi;
839 struct nft_table *table;
840 int family = nfmsg->nfgen_family;
841 struct nft_ctx ctx;
842
843 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
844 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
845 return nft_flush(&ctx, family);
846
847 afi = nf_tables_afinfo_lookup(net, family, false);
848 if (IS_ERR(afi))
849 return PTR_ERR(afi);
850
851 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
852 if (IS_ERR(table))
853 return PTR_ERR(table);
854
855 ctx.afi = afi;
856 ctx.table = table;
857
858 return nft_flush_table(&ctx);
859 }
860
861 static void nf_tables_table_destroy(struct nft_ctx *ctx)
862 {
863 BUG_ON(ctx->table->use > 0);
864
865 kfree(ctx->table);
866 module_put(ctx->afi->owner);
867 }
868
869 int nft_register_chain_type(const struct nf_chain_type *ctype)
870 {
871 int err = 0;
872
873 nfnl_lock(NFNL_SUBSYS_NFTABLES);
874 if (chain_type[ctype->family][ctype->type] != NULL) {
875 err = -EBUSY;
876 goto out;
877 }
878 chain_type[ctype->family][ctype->type] = ctype;
879 out:
880 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
881 return err;
882 }
883 EXPORT_SYMBOL_GPL(nft_register_chain_type);
884
885 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
886 {
887 nfnl_lock(NFNL_SUBSYS_NFTABLES);
888 chain_type[ctype->family][ctype->type] = NULL;
889 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
890 }
891 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
892
893 /*
894 * Chains
895 */
896
897 static struct nft_chain *
898 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle,
899 u8 genmask)
900 {
901 struct nft_chain *chain;
902
903 list_for_each_entry(chain, &table->chains, list) {
904 if (chain->handle == handle &&
905 nft_active_genmask(chain, genmask))
906 return chain;
907 }
908
909 return ERR_PTR(-ENOENT);
910 }
911
912 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
913 const struct nlattr *nla,
914 u8 genmask)
915 {
916 struct nft_chain *chain;
917
918 if (nla == NULL)
919 return ERR_PTR(-EINVAL);
920
921 list_for_each_entry(chain, &table->chains, list) {
922 if (!nla_strcmp(nla, chain->name) &&
923 nft_active_genmask(chain, genmask))
924 return chain;
925 }
926
927 return ERR_PTR(-ENOENT);
928 }
929
930 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
931 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
932 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
933 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
934 .len = NFT_CHAIN_MAXNAMELEN - 1 },
935 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
936 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
937 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
938 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
939 };
940
941 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
942 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
943 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
944 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
945 .len = IFNAMSIZ - 1 },
946 };
947
948 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
949 {
950 struct nft_stats *cpu_stats, total;
951 struct nlattr *nest;
952 unsigned int seq;
953 u64 pkts, bytes;
954 int cpu;
955
956 memset(&total, 0, sizeof(total));
957 for_each_possible_cpu(cpu) {
958 cpu_stats = per_cpu_ptr(stats, cpu);
959 do {
960 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
961 pkts = cpu_stats->pkts;
962 bytes = cpu_stats->bytes;
963 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
964 total.pkts += pkts;
965 total.bytes += bytes;
966 }
967 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
968 if (nest == NULL)
969 goto nla_put_failure;
970
971 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
972 NFTA_COUNTER_PAD) ||
973 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
974 NFTA_COUNTER_PAD))
975 goto nla_put_failure;
976
977 nla_nest_end(skb, nest);
978 return 0;
979
980 nla_put_failure:
981 return -ENOSPC;
982 }
983
984 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
985 u32 portid, u32 seq, int event, u32 flags,
986 int family, const struct nft_table *table,
987 const struct nft_chain *chain)
988 {
989 struct nlmsghdr *nlh;
990 struct nfgenmsg *nfmsg;
991
992 event |= NFNL_SUBSYS_NFTABLES << 8;
993 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
994 if (nlh == NULL)
995 goto nla_put_failure;
996
997 nfmsg = nlmsg_data(nlh);
998 nfmsg->nfgen_family = family;
999 nfmsg->version = NFNETLINK_V0;
1000 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1001
1002 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1003 goto nla_put_failure;
1004 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1005 NFTA_CHAIN_PAD))
1006 goto nla_put_failure;
1007 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1008 goto nla_put_failure;
1009
1010 if (chain->flags & NFT_BASE_CHAIN) {
1011 const struct nft_base_chain *basechain = nft_base_chain(chain);
1012 const struct nf_hook_ops *ops = &basechain->ops[0];
1013 struct nlattr *nest;
1014
1015 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
1016 if (nest == NULL)
1017 goto nla_put_failure;
1018 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1019 goto nla_put_failure;
1020 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1021 goto nla_put_failure;
1022 if (basechain->dev_name[0] &&
1023 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1024 goto nla_put_failure;
1025 nla_nest_end(skb, nest);
1026
1027 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1028 htonl(basechain->policy)))
1029 goto nla_put_failure;
1030
1031 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1032 goto nla_put_failure;
1033
1034 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
1035 goto nla_put_failure;
1036 }
1037
1038 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1039 goto nla_put_failure;
1040
1041 nlmsg_end(skb, nlh);
1042 return 0;
1043
1044 nla_put_failure:
1045 nlmsg_trim(skb, nlh);
1046 return -1;
1047 }
1048
1049 static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1050 {
1051 struct sk_buff *skb;
1052 int err;
1053
1054 if (!ctx->report &&
1055 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1056 return 0;
1057
1058 err = -ENOBUFS;
1059 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1060 if (skb == NULL)
1061 goto err;
1062
1063 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1064 event, 0, ctx->afi->family, ctx->table,
1065 ctx->chain);
1066 if (err < 0) {
1067 kfree_skb(skb);
1068 goto err;
1069 }
1070
1071 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1072 ctx->report, GFP_KERNEL);
1073 err:
1074 if (err < 0) {
1075 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1076 err);
1077 }
1078 return err;
1079 }
1080
1081 static int nf_tables_dump_chains(struct sk_buff *skb,
1082 struct netlink_callback *cb)
1083 {
1084 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1085 const struct nft_af_info *afi;
1086 const struct nft_table *table;
1087 const struct nft_chain *chain;
1088 unsigned int idx = 0, s_idx = cb->args[0];
1089 struct net *net = sock_net(skb->sk);
1090 int family = nfmsg->nfgen_family;
1091
1092 rcu_read_lock();
1093 cb->seq = net->nft.base_seq;
1094
1095 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1096 if (family != NFPROTO_UNSPEC && family != afi->family)
1097 continue;
1098
1099 list_for_each_entry_rcu(table, &afi->tables, list) {
1100 list_for_each_entry_rcu(chain, &table->chains, list) {
1101 if (idx < s_idx)
1102 goto cont;
1103 if (idx > s_idx)
1104 memset(&cb->args[1], 0,
1105 sizeof(cb->args) - sizeof(cb->args[0]));
1106 if (!nft_is_active(net, chain))
1107 continue;
1108 if (nf_tables_fill_chain_info(skb, net,
1109 NETLINK_CB(cb->skb).portid,
1110 cb->nlh->nlmsg_seq,
1111 NFT_MSG_NEWCHAIN,
1112 NLM_F_MULTI,
1113 afi->family, table, chain) < 0)
1114 goto done;
1115
1116 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1117 cont:
1118 idx++;
1119 }
1120 }
1121 }
1122 done:
1123 rcu_read_unlock();
1124 cb->args[0] = idx;
1125 return skb->len;
1126 }
1127
1128 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1129 struct sk_buff *skb, const struct nlmsghdr *nlh,
1130 const struct nlattr * const nla[])
1131 {
1132 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1133 u8 genmask = nft_genmask_cur(net);
1134 const struct nft_af_info *afi;
1135 const struct nft_table *table;
1136 const struct nft_chain *chain;
1137 struct sk_buff *skb2;
1138 int family = nfmsg->nfgen_family;
1139 int err;
1140
1141 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1142 struct netlink_dump_control c = {
1143 .dump = nf_tables_dump_chains,
1144 };
1145 return netlink_dump_start(nlsk, skb, nlh, &c);
1146 }
1147
1148 afi = nf_tables_afinfo_lookup(net, family, false);
1149 if (IS_ERR(afi))
1150 return PTR_ERR(afi);
1151
1152 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1153 if (IS_ERR(table))
1154 return PTR_ERR(table);
1155
1156 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1157 if (IS_ERR(chain))
1158 return PTR_ERR(chain);
1159
1160 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1161 if (!skb2)
1162 return -ENOMEM;
1163
1164 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1165 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1166 family, table, chain);
1167 if (err < 0)
1168 goto err;
1169
1170 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1171
1172 err:
1173 kfree_skb(skb2);
1174 return err;
1175 }
1176
1177 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1178 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1179 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1180 };
1181
1182 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1183 {
1184 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1185 struct nft_stats __percpu *newstats;
1186 struct nft_stats *stats;
1187 int err;
1188
1189 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1190 if (err < 0)
1191 return ERR_PTR(err);
1192
1193 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1194 return ERR_PTR(-EINVAL);
1195
1196 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1197 if (newstats == NULL)
1198 return ERR_PTR(-ENOMEM);
1199
1200 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1201 * are not exposed to userspace.
1202 */
1203 preempt_disable();
1204 stats = this_cpu_ptr(newstats);
1205 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1206 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1207 preempt_enable();
1208
1209 return newstats;
1210 }
1211
1212 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1213 struct nft_stats __percpu *newstats)
1214 {
1215 if (newstats == NULL)
1216 return;
1217
1218 if (chain->stats) {
1219 struct nft_stats __percpu *oldstats =
1220 nft_dereference(chain->stats);
1221
1222 rcu_assign_pointer(chain->stats, newstats);
1223 synchronize_rcu();
1224 free_percpu(oldstats);
1225 } else
1226 rcu_assign_pointer(chain->stats, newstats);
1227 }
1228
1229 static void nf_tables_chain_destroy(struct nft_chain *chain)
1230 {
1231 BUG_ON(chain->use > 0);
1232
1233 if (chain->flags & NFT_BASE_CHAIN) {
1234 struct nft_base_chain *basechain = nft_base_chain(chain);
1235
1236 module_put(basechain->type->owner);
1237 free_percpu(basechain->stats);
1238 if (basechain->ops[0].dev != NULL)
1239 dev_put(basechain->ops[0].dev);
1240 kfree(basechain);
1241 } else {
1242 kfree(chain);
1243 }
1244 }
1245
1246 struct nft_chain_hook {
1247 u32 num;
1248 u32 priority;
1249 const struct nf_chain_type *type;
1250 struct net_device *dev;
1251 };
1252
1253 static int nft_chain_parse_hook(struct net *net,
1254 const struct nlattr * const nla[],
1255 struct nft_af_info *afi,
1256 struct nft_chain_hook *hook, bool create)
1257 {
1258 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1259 const struct nf_chain_type *type;
1260 struct net_device *dev;
1261 int err;
1262
1263 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1264 nft_hook_policy);
1265 if (err < 0)
1266 return err;
1267
1268 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1269 ha[NFTA_HOOK_PRIORITY] == NULL)
1270 return -EINVAL;
1271
1272 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1273 if (hook->num >= afi->nhooks)
1274 return -EINVAL;
1275
1276 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1277
1278 type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT];
1279 if (nla[NFTA_CHAIN_TYPE]) {
1280 type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE],
1281 create);
1282 if (IS_ERR(type))
1283 return PTR_ERR(type);
1284 }
1285 if (!(type->hook_mask & (1 << hook->num)))
1286 return -EOPNOTSUPP;
1287 if (!try_module_get(type->owner))
1288 return -ENOENT;
1289
1290 hook->type = type;
1291
1292 hook->dev = NULL;
1293 if (afi->flags & NFT_AF_NEEDS_DEV) {
1294 char ifname[IFNAMSIZ];
1295
1296 if (!ha[NFTA_HOOK_DEV]) {
1297 module_put(type->owner);
1298 return -EOPNOTSUPP;
1299 }
1300
1301 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1302 dev = dev_get_by_name(net, ifname);
1303 if (!dev) {
1304 module_put(type->owner);
1305 return -ENOENT;
1306 }
1307 hook->dev = dev;
1308 } else if (ha[NFTA_HOOK_DEV]) {
1309 module_put(type->owner);
1310 return -EOPNOTSUPP;
1311 }
1312
1313 return 0;
1314 }
1315
1316 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1317 {
1318 module_put(hook->type->owner);
1319 if (hook->dev != NULL)
1320 dev_put(hook->dev);
1321 }
1322
1323 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1324 struct sk_buff *skb, const struct nlmsghdr *nlh,
1325 const struct nlattr * const nla[])
1326 {
1327 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1328 const struct nlattr * uninitialized_var(name);
1329 struct nft_af_info *afi;
1330 struct nft_table *table;
1331 struct nft_chain *chain;
1332 struct nft_base_chain *basechain = NULL;
1333 u8 genmask = nft_genmask_next(net);
1334 int family = nfmsg->nfgen_family;
1335 u8 policy = NF_ACCEPT;
1336 u64 handle = 0;
1337 unsigned int i;
1338 struct nft_stats __percpu *stats;
1339 int err;
1340 bool create;
1341 struct nft_ctx ctx;
1342
1343 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1344
1345 afi = nf_tables_afinfo_lookup(net, family, true);
1346 if (IS_ERR(afi))
1347 return PTR_ERR(afi);
1348
1349 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1350 if (IS_ERR(table))
1351 return PTR_ERR(table);
1352
1353 chain = NULL;
1354 name = nla[NFTA_CHAIN_NAME];
1355
1356 if (nla[NFTA_CHAIN_HANDLE]) {
1357 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1358 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
1359 if (IS_ERR(chain))
1360 return PTR_ERR(chain);
1361 } else {
1362 chain = nf_tables_chain_lookup(table, name, genmask);
1363 if (IS_ERR(chain)) {
1364 if (PTR_ERR(chain) != -ENOENT)
1365 return PTR_ERR(chain);
1366 chain = NULL;
1367 }
1368 }
1369
1370 if (nla[NFTA_CHAIN_POLICY]) {
1371 if ((chain != NULL &&
1372 !(chain->flags & NFT_BASE_CHAIN)))
1373 return -EOPNOTSUPP;
1374
1375 if (chain == NULL &&
1376 nla[NFTA_CHAIN_HOOK] == NULL)
1377 return -EOPNOTSUPP;
1378
1379 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1380 switch (policy) {
1381 case NF_DROP:
1382 case NF_ACCEPT:
1383 break;
1384 default:
1385 return -EINVAL;
1386 }
1387 }
1388
1389 if (chain != NULL) {
1390 struct nft_stats *stats = NULL;
1391 struct nft_trans *trans;
1392
1393 if (nlh->nlmsg_flags & NLM_F_EXCL)
1394 return -EEXIST;
1395 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1396 return -EOPNOTSUPP;
1397
1398 if (nla[NFTA_CHAIN_HOOK]) {
1399 struct nft_base_chain *basechain;
1400 struct nft_chain_hook hook;
1401 struct nf_hook_ops *ops;
1402
1403 if (!(chain->flags & NFT_BASE_CHAIN))
1404 return -EBUSY;
1405
1406 err = nft_chain_parse_hook(net, nla, afi, &hook,
1407 create);
1408 if (err < 0)
1409 return err;
1410
1411 basechain = nft_base_chain(chain);
1412 if (basechain->type != hook.type) {
1413 nft_chain_release_hook(&hook);
1414 return -EBUSY;
1415 }
1416
1417 for (i = 0; i < afi->nops; i++) {
1418 ops = &basechain->ops[i];
1419 if (ops->hooknum != hook.num ||
1420 ops->priority != hook.priority ||
1421 ops->dev != hook.dev) {
1422 nft_chain_release_hook(&hook);
1423 return -EBUSY;
1424 }
1425 }
1426 nft_chain_release_hook(&hook);
1427 }
1428
1429 if (nla[NFTA_CHAIN_HANDLE] && name) {
1430 struct nft_chain *chain2;
1431
1432 chain2 = nf_tables_chain_lookup(table,
1433 nla[NFTA_CHAIN_NAME],
1434 genmask);
1435 if (IS_ERR(chain2))
1436 return PTR_ERR(chain2);
1437 }
1438
1439 if (nla[NFTA_CHAIN_COUNTERS]) {
1440 if (!(chain->flags & NFT_BASE_CHAIN))
1441 return -EOPNOTSUPP;
1442
1443 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1444 if (IS_ERR(stats))
1445 return PTR_ERR(stats);
1446 }
1447
1448 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1449 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1450 sizeof(struct nft_trans_chain));
1451 if (trans == NULL) {
1452 free_percpu(stats);
1453 return -ENOMEM;
1454 }
1455
1456 nft_trans_chain_stats(trans) = stats;
1457 nft_trans_chain_update(trans) = true;
1458
1459 if (nla[NFTA_CHAIN_POLICY])
1460 nft_trans_chain_policy(trans) = policy;
1461 else
1462 nft_trans_chain_policy(trans) = -1;
1463
1464 if (nla[NFTA_CHAIN_HANDLE] && name) {
1465 nla_strlcpy(nft_trans_chain_name(trans), name,
1466 NFT_CHAIN_MAXNAMELEN);
1467 }
1468 list_add_tail(&trans->list, &net->nft.commit_list);
1469 return 0;
1470 }
1471
1472 if (table->use == UINT_MAX)
1473 return -EOVERFLOW;
1474
1475 if (nla[NFTA_CHAIN_HOOK]) {
1476 struct nft_chain_hook hook;
1477 struct nf_hook_ops *ops;
1478 nf_hookfn *hookfn;
1479
1480 err = nft_chain_parse_hook(net, nla, afi, &hook, create);
1481 if (err < 0)
1482 return err;
1483
1484 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1485 if (basechain == NULL) {
1486 nft_chain_release_hook(&hook);
1487 return -ENOMEM;
1488 }
1489
1490 if (hook.dev != NULL)
1491 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1492
1493 if (nla[NFTA_CHAIN_COUNTERS]) {
1494 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1495 if (IS_ERR(stats)) {
1496 nft_chain_release_hook(&hook);
1497 kfree(basechain);
1498 return PTR_ERR(stats);
1499 }
1500 basechain->stats = stats;
1501 } else {
1502 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1503 if (stats == NULL) {
1504 nft_chain_release_hook(&hook);
1505 kfree(basechain);
1506 return -ENOMEM;
1507 }
1508 rcu_assign_pointer(basechain->stats, stats);
1509 }
1510
1511 hookfn = hook.type->hooks[hook.num];
1512 basechain->type = hook.type;
1513 chain = &basechain->chain;
1514
1515 for (i = 0; i < afi->nops; i++) {
1516 ops = &basechain->ops[i];
1517 ops->pf = family;
1518 ops->hooknum = hook.num;
1519 ops->priority = hook.priority;
1520 ops->priv = chain;
1521 ops->hook = afi->hooks[ops->hooknum];
1522 ops->dev = hook.dev;
1523 if (hookfn)
1524 ops->hook = hookfn;
1525 if (afi->hook_ops_init)
1526 afi->hook_ops_init(ops, i);
1527 }
1528
1529 chain->flags |= NFT_BASE_CHAIN;
1530 basechain->policy = policy;
1531 } else {
1532 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1533 if (chain == NULL)
1534 return -ENOMEM;
1535 }
1536
1537 INIT_LIST_HEAD(&chain->rules);
1538 chain->handle = nf_tables_alloc_handle(table);
1539 chain->table = table;
1540 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1541
1542 err = nf_tables_register_hooks(net, table, chain, afi->nops);
1543 if (err < 0)
1544 goto err1;
1545
1546 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1547 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1548 if (err < 0)
1549 goto err2;
1550
1551 table->use++;
1552 list_add_tail_rcu(&chain->list, &table->chains);
1553 return 0;
1554 err2:
1555 nf_tables_unregister_hooks(net, table, chain, afi->nops);
1556 err1:
1557 nf_tables_chain_destroy(chain);
1558 return err;
1559 }
1560
1561 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1562 struct sk_buff *skb, const struct nlmsghdr *nlh,
1563 const struct nlattr * const nla[])
1564 {
1565 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1566 u8 genmask = nft_genmask_next(net);
1567 struct nft_af_info *afi;
1568 struct nft_table *table;
1569 struct nft_chain *chain;
1570 int family = nfmsg->nfgen_family;
1571 struct nft_ctx ctx;
1572
1573 afi = nf_tables_afinfo_lookup(net, family, false);
1574 if (IS_ERR(afi))
1575 return PTR_ERR(afi);
1576
1577 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1578 if (IS_ERR(table))
1579 return PTR_ERR(table);
1580
1581 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1582 if (IS_ERR(chain))
1583 return PTR_ERR(chain);
1584 if (chain->use > 0)
1585 return -EBUSY;
1586
1587 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1588
1589 return nft_delchain(&ctx);
1590 }
1591
1592 /*
1593 * Expressions
1594 */
1595
1596 /**
1597 * nft_register_expr - register nf_tables expr type
1598 * @ops: expr type
1599 *
1600 * Registers the expr type for use with nf_tables. Returns zero on
1601 * success or a negative errno code otherwise.
1602 */
1603 int nft_register_expr(struct nft_expr_type *type)
1604 {
1605 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1606 if (type->family == NFPROTO_UNSPEC)
1607 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1608 else
1609 list_add_rcu(&type->list, &nf_tables_expressions);
1610 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1611 return 0;
1612 }
1613 EXPORT_SYMBOL_GPL(nft_register_expr);
1614
1615 /**
1616 * nft_unregister_expr - unregister nf_tables expr type
1617 * @ops: expr type
1618 *
1619 * Unregisters the expr typefor use with nf_tables.
1620 */
1621 void nft_unregister_expr(struct nft_expr_type *type)
1622 {
1623 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1624 list_del_rcu(&type->list);
1625 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1626 }
1627 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1628
1629 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1630 struct nlattr *nla)
1631 {
1632 const struct nft_expr_type *type;
1633
1634 list_for_each_entry(type, &nf_tables_expressions, list) {
1635 if (!nla_strcmp(nla, type->name) &&
1636 (!type->family || type->family == family))
1637 return type;
1638 }
1639 return NULL;
1640 }
1641
1642 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1643 struct nlattr *nla)
1644 {
1645 const struct nft_expr_type *type;
1646
1647 if (nla == NULL)
1648 return ERR_PTR(-EINVAL);
1649
1650 type = __nft_expr_type_get(family, nla);
1651 if (type != NULL && try_module_get(type->owner))
1652 return type;
1653
1654 #ifdef CONFIG_MODULES
1655 if (type == NULL) {
1656 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1657 request_module("nft-expr-%u-%.*s", family,
1658 nla_len(nla), (char *)nla_data(nla));
1659 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1660 if (__nft_expr_type_get(family, nla))
1661 return ERR_PTR(-EAGAIN);
1662
1663 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1664 request_module("nft-expr-%.*s",
1665 nla_len(nla), (char *)nla_data(nla));
1666 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1667 if (__nft_expr_type_get(family, nla))
1668 return ERR_PTR(-EAGAIN);
1669 }
1670 #endif
1671 return ERR_PTR(-ENOENT);
1672 }
1673
1674 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1675 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1676 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1677 };
1678
1679 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1680 const struct nft_expr *expr)
1681 {
1682 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1683 goto nla_put_failure;
1684
1685 if (expr->ops->dump) {
1686 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1687 if (data == NULL)
1688 goto nla_put_failure;
1689 if (expr->ops->dump(skb, expr) < 0)
1690 goto nla_put_failure;
1691 nla_nest_end(skb, data);
1692 }
1693
1694 return skb->len;
1695
1696 nla_put_failure:
1697 return -1;
1698 };
1699
1700 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1701 const struct nft_expr *expr)
1702 {
1703 struct nlattr *nest;
1704
1705 nest = nla_nest_start(skb, attr);
1706 if (!nest)
1707 goto nla_put_failure;
1708 if (nf_tables_fill_expr_info(skb, expr) < 0)
1709 goto nla_put_failure;
1710 nla_nest_end(skb, nest);
1711 return 0;
1712
1713 nla_put_failure:
1714 return -1;
1715 }
1716
1717 struct nft_expr_info {
1718 const struct nft_expr_ops *ops;
1719 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1720 };
1721
1722 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1723 const struct nlattr *nla,
1724 struct nft_expr_info *info)
1725 {
1726 const struct nft_expr_type *type;
1727 const struct nft_expr_ops *ops;
1728 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1729 int err;
1730
1731 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1732 if (err < 0)
1733 return err;
1734
1735 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1736 if (IS_ERR(type))
1737 return PTR_ERR(type);
1738
1739 if (tb[NFTA_EXPR_DATA]) {
1740 err = nla_parse_nested(info->tb, type->maxattr,
1741 tb[NFTA_EXPR_DATA], type->policy);
1742 if (err < 0)
1743 goto err1;
1744 } else
1745 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1746
1747 if (type->select_ops != NULL) {
1748 ops = type->select_ops(ctx,
1749 (const struct nlattr * const *)info->tb);
1750 if (IS_ERR(ops)) {
1751 err = PTR_ERR(ops);
1752 goto err1;
1753 }
1754 } else
1755 ops = type->ops;
1756
1757 info->ops = ops;
1758 return 0;
1759
1760 err1:
1761 module_put(type->owner);
1762 return err;
1763 }
1764
1765 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1766 const struct nft_expr_info *info,
1767 struct nft_expr *expr)
1768 {
1769 const struct nft_expr_ops *ops = info->ops;
1770 int err;
1771
1772 expr->ops = ops;
1773 if (ops->init) {
1774 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1775 if (err < 0)
1776 goto err1;
1777 }
1778
1779 return 0;
1780
1781 err1:
1782 expr->ops = NULL;
1783 return err;
1784 }
1785
1786 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1787 struct nft_expr *expr)
1788 {
1789 if (expr->ops->destroy)
1790 expr->ops->destroy(ctx, expr);
1791 module_put(expr->ops->type->owner);
1792 }
1793
1794 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1795 const struct nlattr *nla)
1796 {
1797 struct nft_expr_info info;
1798 struct nft_expr *expr;
1799 int err;
1800
1801 err = nf_tables_expr_parse(ctx, nla, &info);
1802 if (err < 0)
1803 goto err1;
1804
1805 err = -ENOMEM;
1806 expr = kzalloc(info.ops->size, GFP_KERNEL);
1807 if (expr == NULL)
1808 goto err2;
1809
1810 err = nf_tables_newexpr(ctx, &info, expr);
1811 if (err < 0)
1812 goto err3;
1813
1814 return expr;
1815 err3:
1816 kfree(expr);
1817 err2:
1818 module_put(info.ops->type->owner);
1819 err1:
1820 return ERR_PTR(err);
1821 }
1822
1823 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1824 {
1825 nf_tables_expr_destroy(ctx, expr);
1826 kfree(expr);
1827 }
1828
1829 /*
1830 * Rules
1831 */
1832
1833 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1834 u64 handle)
1835 {
1836 struct nft_rule *rule;
1837
1838 // FIXME: this sucks
1839 list_for_each_entry(rule, &chain->rules, list) {
1840 if (handle == rule->handle)
1841 return rule;
1842 }
1843
1844 return ERR_PTR(-ENOENT);
1845 }
1846
1847 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1848 const struct nlattr *nla)
1849 {
1850 if (nla == NULL)
1851 return ERR_PTR(-EINVAL);
1852
1853 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1854 }
1855
1856 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1857 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1858 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1859 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1860 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1861 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1862 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1863 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1864 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1865 .len = NFT_USERDATA_MAXLEN },
1866 };
1867
1868 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1869 u32 portid, u32 seq, int event,
1870 u32 flags, int family,
1871 const struct nft_table *table,
1872 const struct nft_chain *chain,
1873 const struct nft_rule *rule)
1874 {
1875 struct nlmsghdr *nlh;
1876 struct nfgenmsg *nfmsg;
1877 const struct nft_expr *expr, *next;
1878 struct nlattr *list;
1879 const struct nft_rule *prule;
1880 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1881
1882 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1883 flags);
1884 if (nlh == NULL)
1885 goto nla_put_failure;
1886
1887 nfmsg = nlmsg_data(nlh);
1888 nfmsg->nfgen_family = family;
1889 nfmsg->version = NFNETLINK_V0;
1890 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1891
1892 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1893 goto nla_put_failure;
1894 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1895 goto nla_put_failure;
1896 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1897 NFTA_RULE_PAD))
1898 goto nla_put_failure;
1899
1900 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1901 prule = list_entry(rule->list.prev, struct nft_rule, list);
1902 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1903 cpu_to_be64(prule->handle),
1904 NFTA_RULE_PAD))
1905 goto nla_put_failure;
1906 }
1907
1908 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1909 if (list == NULL)
1910 goto nla_put_failure;
1911 nft_rule_for_each_expr(expr, next, rule) {
1912 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
1913 goto nla_put_failure;
1914 }
1915 nla_nest_end(skb, list);
1916
1917 if (rule->udata) {
1918 struct nft_userdata *udata = nft_userdata(rule);
1919 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1920 udata->data) < 0)
1921 goto nla_put_failure;
1922 }
1923
1924 nlmsg_end(skb, nlh);
1925 return 0;
1926
1927 nla_put_failure:
1928 nlmsg_trim(skb, nlh);
1929 return -1;
1930 }
1931
1932 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1933 const struct nft_rule *rule,
1934 int event)
1935 {
1936 struct sk_buff *skb;
1937 int err;
1938
1939 if (!ctx->report &&
1940 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1941 return 0;
1942
1943 err = -ENOBUFS;
1944 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1945 if (skb == NULL)
1946 goto err;
1947
1948 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1949 event, 0, ctx->afi->family, ctx->table,
1950 ctx->chain, rule);
1951 if (err < 0) {
1952 kfree_skb(skb);
1953 goto err;
1954 }
1955
1956 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1957 ctx->report, GFP_KERNEL);
1958 err:
1959 if (err < 0) {
1960 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1961 err);
1962 }
1963 return err;
1964 }
1965
1966 struct nft_rule_dump_ctx {
1967 char table[NFT_TABLE_MAXNAMELEN];
1968 char chain[NFT_CHAIN_MAXNAMELEN];
1969 };
1970
1971 static int nf_tables_dump_rules(struct sk_buff *skb,
1972 struct netlink_callback *cb)
1973 {
1974 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1975 const struct nft_rule_dump_ctx *ctx = cb->data;
1976 const struct nft_af_info *afi;
1977 const struct nft_table *table;
1978 const struct nft_chain *chain;
1979 const struct nft_rule *rule;
1980 unsigned int idx = 0, s_idx = cb->args[0];
1981 struct net *net = sock_net(skb->sk);
1982 int family = nfmsg->nfgen_family;
1983
1984 rcu_read_lock();
1985 cb->seq = net->nft.base_seq;
1986
1987 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1988 if (family != NFPROTO_UNSPEC && family != afi->family)
1989 continue;
1990
1991 list_for_each_entry_rcu(table, &afi->tables, list) {
1992 if (ctx && ctx->table[0] &&
1993 strcmp(ctx->table, table->name) != 0)
1994 continue;
1995
1996 list_for_each_entry_rcu(chain, &table->chains, list) {
1997 if (ctx && ctx->chain[0] &&
1998 strcmp(ctx->chain, chain->name) != 0)
1999 continue;
2000
2001 list_for_each_entry_rcu(rule, &chain->rules, list) {
2002 if (!nft_is_active(net, rule))
2003 goto cont;
2004 if (idx < s_idx)
2005 goto cont;
2006 if (idx > s_idx)
2007 memset(&cb->args[1], 0,
2008 sizeof(cb->args) - sizeof(cb->args[0]));
2009 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2010 cb->nlh->nlmsg_seq,
2011 NFT_MSG_NEWRULE,
2012 NLM_F_MULTI | NLM_F_APPEND,
2013 afi->family, table, chain, rule) < 0)
2014 goto done;
2015
2016 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2017 cont:
2018 idx++;
2019 }
2020 }
2021 }
2022 }
2023 done:
2024 rcu_read_unlock();
2025
2026 cb->args[0] = idx;
2027 return skb->len;
2028 }
2029
2030 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2031 {
2032 kfree(cb->data);
2033 return 0;
2034 }
2035
2036 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2037 struct sk_buff *skb, const struct nlmsghdr *nlh,
2038 const struct nlattr * const nla[])
2039 {
2040 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2041 u8 genmask = nft_genmask_cur(net);
2042 const struct nft_af_info *afi;
2043 const struct nft_table *table;
2044 const struct nft_chain *chain;
2045 const struct nft_rule *rule;
2046 struct sk_buff *skb2;
2047 int family = nfmsg->nfgen_family;
2048 int err;
2049
2050 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2051 struct netlink_dump_control c = {
2052 .dump = nf_tables_dump_rules,
2053 .done = nf_tables_dump_rules_done,
2054 };
2055
2056 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2057 struct nft_rule_dump_ctx *ctx;
2058
2059 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
2060 if (!ctx)
2061 return -ENOMEM;
2062
2063 if (nla[NFTA_RULE_TABLE])
2064 nla_strlcpy(ctx->table, nla[NFTA_RULE_TABLE],
2065 sizeof(ctx->table));
2066 if (nla[NFTA_RULE_CHAIN])
2067 nla_strlcpy(ctx->chain, nla[NFTA_RULE_CHAIN],
2068 sizeof(ctx->chain));
2069 c.data = ctx;
2070 }
2071
2072 return netlink_dump_start(nlsk, skb, nlh, &c);
2073 }
2074
2075 afi = nf_tables_afinfo_lookup(net, family, false);
2076 if (IS_ERR(afi))
2077 return PTR_ERR(afi);
2078
2079 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2080 if (IS_ERR(table))
2081 return PTR_ERR(table);
2082
2083 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2084 if (IS_ERR(chain))
2085 return PTR_ERR(chain);
2086
2087 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2088 if (IS_ERR(rule))
2089 return PTR_ERR(rule);
2090
2091 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2092 if (!skb2)
2093 return -ENOMEM;
2094
2095 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2096 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2097 family, table, chain, rule);
2098 if (err < 0)
2099 goto err;
2100
2101 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2102
2103 err:
2104 kfree_skb(skb2);
2105 return err;
2106 }
2107
2108 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2109 struct nft_rule *rule)
2110 {
2111 struct nft_expr *expr;
2112
2113 /*
2114 * Careful: some expressions might not be initialized in case this
2115 * is called on error from nf_tables_newrule().
2116 */
2117 expr = nft_expr_first(rule);
2118 while (expr != nft_expr_last(rule) && expr->ops) {
2119 nf_tables_expr_destroy(ctx, expr);
2120 expr = nft_expr_next(expr);
2121 }
2122 kfree(rule);
2123 }
2124
2125 #define NFT_RULE_MAXEXPRS 128
2126
2127 static struct nft_expr_info *info;
2128
2129 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2130 struct sk_buff *skb, const struct nlmsghdr *nlh,
2131 const struct nlattr * const nla[])
2132 {
2133 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2134 u8 genmask = nft_genmask_next(net);
2135 struct nft_af_info *afi;
2136 struct nft_table *table;
2137 struct nft_chain *chain;
2138 struct nft_rule *rule, *old_rule = NULL;
2139 struct nft_userdata *udata;
2140 struct nft_trans *trans = NULL;
2141 struct nft_expr *expr;
2142 struct nft_ctx ctx;
2143 struct nlattr *tmp;
2144 unsigned int size, i, n, ulen = 0, usize = 0;
2145 int err, rem;
2146 bool create;
2147 u64 handle, pos_handle;
2148
2149 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2150
2151 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2152 if (IS_ERR(afi))
2153 return PTR_ERR(afi);
2154
2155 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2156 if (IS_ERR(table))
2157 return PTR_ERR(table);
2158
2159 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2160 if (IS_ERR(chain))
2161 return PTR_ERR(chain);
2162
2163 if (nla[NFTA_RULE_HANDLE]) {
2164 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2165 rule = __nf_tables_rule_lookup(chain, handle);
2166 if (IS_ERR(rule))
2167 return PTR_ERR(rule);
2168
2169 if (nlh->nlmsg_flags & NLM_F_EXCL)
2170 return -EEXIST;
2171 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2172 old_rule = rule;
2173 else
2174 return -EOPNOTSUPP;
2175 } else {
2176 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2177 return -EINVAL;
2178 handle = nf_tables_alloc_handle(table);
2179
2180 if (chain->use == UINT_MAX)
2181 return -EOVERFLOW;
2182 }
2183
2184 if (nla[NFTA_RULE_POSITION]) {
2185 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2186 return -EOPNOTSUPP;
2187
2188 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2189 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2190 if (IS_ERR(old_rule))
2191 return PTR_ERR(old_rule);
2192 }
2193
2194 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2195
2196 n = 0;
2197 size = 0;
2198 if (nla[NFTA_RULE_EXPRESSIONS]) {
2199 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2200 err = -EINVAL;
2201 if (nla_type(tmp) != NFTA_LIST_ELEM)
2202 goto err1;
2203 if (n == NFT_RULE_MAXEXPRS)
2204 goto err1;
2205 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2206 if (err < 0)
2207 goto err1;
2208 size += info[n].ops->size;
2209 n++;
2210 }
2211 }
2212 /* Check for overflow of dlen field */
2213 err = -EFBIG;
2214 if (size >= 1 << 12)
2215 goto err1;
2216
2217 if (nla[NFTA_RULE_USERDATA]) {
2218 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2219 if (ulen > 0)
2220 usize = sizeof(struct nft_userdata) + ulen;
2221 }
2222
2223 err = -ENOMEM;
2224 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2225 if (rule == NULL)
2226 goto err1;
2227
2228 nft_activate_next(net, rule);
2229
2230 rule->handle = handle;
2231 rule->dlen = size;
2232 rule->udata = ulen ? 1 : 0;
2233
2234 if (ulen) {
2235 udata = nft_userdata(rule);
2236 udata->len = ulen - 1;
2237 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2238 }
2239
2240 expr = nft_expr_first(rule);
2241 for (i = 0; i < n; i++) {
2242 err = nf_tables_newexpr(&ctx, &info[i], expr);
2243 if (err < 0)
2244 goto err2;
2245 info[i].ops = NULL;
2246 expr = nft_expr_next(expr);
2247 }
2248
2249 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2250 if (nft_is_active_next(net, old_rule)) {
2251 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2252 old_rule);
2253 if (trans == NULL) {
2254 err = -ENOMEM;
2255 goto err2;
2256 }
2257 nft_deactivate_next(net, old_rule);
2258 chain->use--;
2259 list_add_tail_rcu(&rule->list, &old_rule->list);
2260 } else {
2261 err = -ENOENT;
2262 goto err2;
2263 }
2264 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2265 if (old_rule)
2266 list_add_rcu(&rule->list, &old_rule->list);
2267 else
2268 list_add_tail_rcu(&rule->list, &chain->rules);
2269 else {
2270 if (old_rule)
2271 list_add_tail_rcu(&rule->list, &old_rule->list);
2272 else
2273 list_add_rcu(&rule->list, &chain->rules);
2274 }
2275
2276 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2277 err = -ENOMEM;
2278 goto err3;
2279 }
2280 chain->use++;
2281 return 0;
2282
2283 err3:
2284 list_del_rcu(&rule->list);
2285 err2:
2286 nf_tables_rule_destroy(&ctx, rule);
2287 err1:
2288 for (i = 0; i < n; i++) {
2289 if (info[i].ops != NULL)
2290 module_put(info[i].ops->type->owner);
2291 }
2292 return err;
2293 }
2294
2295 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2296 struct sk_buff *skb, const struct nlmsghdr *nlh,
2297 const struct nlattr * const nla[])
2298 {
2299 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2300 u8 genmask = nft_genmask_next(net);
2301 struct nft_af_info *afi;
2302 struct nft_table *table;
2303 struct nft_chain *chain = NULL;
2304 struct nft_rule *rule;
2305 int family = nfmsg->nfgen_family, err = 0;
2306 struct nft_ctx ctx;
2307
2308 afi = nf_tables_afinfo_lookup(net, family, false);
2309 if (IS_ERR(afi))
2310 return PTR_ERR(afi);
2311
2312 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2313 if (IS_ERR(table))
2314 return PTR_ERR(table);
2315
2316 if (nla[NFTA_RULE_CHAIN]) {
2317 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2318 genmask);
2319 if (IS_ERR(chain))
2320 return PTR_ERR(chain);
2321 }
2322
2323 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2324
2325 if (chain) {
2326 if (nla[NFTA_RULE_HANDLE]) {
2327 rule = nf_tables_rule_lookup(chain,
2328 nla[NFTA_RULE_HANDLE]);
2329 if (IS_ERR(rule))
2330 return PTR_ERR(rule);
2331
2332 err = nft_delrule(&ctx, rule);
2333 } else {
2334 err = nft_delrule_by_chain(&ctx);
2335 }
2336 } else {
2337 list_for_each_entry(chain, &table->chains, list) {
2338 if (!nft_is_active_next(net, chain))
2339 continue;
2340
2341 ctx.chain = chain;
2342 err = nft_delrule_by_chain(&ctx);
2343 if (err < 0)
2344 break;
2345 }
2346 }
2347
2348 return err;
2349 }
2350
2351 /*
2352 * Sets
2353 */
2354
2355 static LIST_HEAD(nf_tables_set_ops);
2356
2357 int nft_register_set(struct nft_set_ops *ops)
2358 {
2359 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2360 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2361 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2362 return 0;
2363 }
2364 EXPORT_SYMBOL_GPL(nft_register_set);
2365
2366 void nft_unregister_set(struct nft_set_ops *ops)
2367 {
2368 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2369 list_del_rcu(&ops->list);
2370 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2371 }
2372 EXPORT_SYMBOL_GPL(nft_unregister_set);
2373
2374 /*
2375 * Select a set implementation based on the data characteristics and the
2376 * given policy. The total memory use might not be known if no size is
2377 * given, in that case the amount of memory per element is used.
2378 */
2379 static const struct nft_set_ops *
2380 nft_select_set_ops(const struct nlattr * const nla[],
2381 const struct nft_set_desc *desc,
2382 enum nft_set_policies policy)
2383 {
2384 const struct nft_set_ops *ops, *bops;
2385 struct nft_set_estimate est, best;
2386 u32 features;
2387
2388 #ifdef CONFIG_MODULES
2389 if (list_empty(&nf_tables_set_ops)) {
2390 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2391 request_module("nft-set");
2392 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2393 if (!list_empty(&nf_tables_set_ops))
2394 return ERR_PTR(-EAGAIN);
2395 }
2396 #endif
2397 features = 0;
2398 if (nla[NFTA_SET_FLAGS] != NULL) {
2399 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2400 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT;
2401 }
2402
2403 bops = NULL;
2404 best.size = ~0;
2405 best.class = ~0;
2406
2407 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2408 if ((ops->features & features) != features)
2409 continue;
2410 if (!ops->estimate(desc, features, &est))
2411 continue;
2412
2413 switch (policy) {
2414 case NFT_SET_POL_PERFORMANCE:
2415 if (est.class < best.class)
2416 break;
2417 if (est.class == best.class && est.size < best.size)
2418 break;
2419 continue;
2420 case NFT_SET_POL_MEMORY:
2421 if (est.size < best.size)
2422 break;
2423 if (est.size == best.size && est.class < best.class)
2424 break;
2425 continue;
2426 default:
2427 break;
2428 }
2429
2430 if (!try_module_get(ops->owner))
2431 continue;
2432 if (bops != NULL)
2433 module_put(bops->owner);
2434
2435 bops = ops;
2436 best = est;
2437 }
2438
2439 if (bops != NULL)
2440 return bops;
2441
2442 return ERR_PTR(-EOPNOTSUPP);
2443 }
2444
2445 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2446 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2447 [NFTA_SET_NAME] = { .type = NLA_STRING,
2448 .len = NFT_SET_MAXNAMELEN - 1 },
2449 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2450 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2451 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2452 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2453 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2454 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2455 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2456 [NFTA_SET_ID] = { .type = NLA_U32 },
2457 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2458 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2459 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2460 .len = NFT_USERDATA_MAXLEN },
2461 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
2462 };
2463
2464 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2465 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2466 };
2467
2468 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2469 const struct sk_buff *skb,
2470 const struct nlmsghdr *nlh,
2471 const struct nlattr * const nla[],
2472 u8 genmask)
2473 {
2474 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2475 struct nft_af_info *afi = NULL;
2476 struct nft_table *table = NULL;
2477
2478 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2479 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2480 if (IS_ERR(afi))
2481 return PTR_ERR(afi);
2482 }
2483
2484 if (nla[NFTA_SET_TABLE] != NULL) {
2485 if (afi == NULL)
2486 return -EAFNOSUPPORT;
2487
2488 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2489 genmask);
2490 if (IS_ERR(table))
2491 return PTR_ERR(table);
2492 }
2493
2494 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
2495 return 0;
2496 }
2497
2498 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2499 const struct nlattr *nla, u8 genmask)
2500 {
2501 struct nft_set *set;
2502
2503 if (nla == NULL)
2504 return ERR_PTR(-EINVAL);
2505
2506 list_for_each_entry(set, &table->sets, list) {
2507 if (!nla_strcmp(nla, set->name) &&
2508 nft_active_genmask(set, genmask))
2509 return set;
2510 }
2511 return ERR_PTR(-ENOENT);
2512 }
2513 EXPORT_SYMBOL_GPL(nf_tables_set_lookup);
2514
2515 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2516 const struct nlattr *nla,
2517 u8 genmask)
2518 {
2519 struct nft_trans *trans;
2520 u32 id = ntohl(nla_get_be32(nla));
2521
2522 list_for_each_entry(trans, &net->nft.commit_list, list) {
2523 struct nft_set *set = nft_trans_set(trans);
2524
2525 if (trans->msg_type == NFT_MSG_NEWSET &&
2526 id == nft_trans_set_id(trans) &&
2527 nft_active_genmask(set, genmask))
2528 return set;
2529 }
2530 return ERR_PTR(-ENOENT);
2531 }
2532 EXPORT_SYMBOL_GPL(nf_tables_set_lookup_byid);
2533
2534 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2535 const char *name)
2536 {
2537 const struct nft_set *i;
2538 const char *p;
2539 unsigned long *inuse;
2540 unsigned int n = 0, min = 0;
2541
2542 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
2543 if (p != NULL) {
2544 if (p[1] != 'd' || strchr(p + 2, '%'))
2545 return -EINVAL;
2546
2547 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2548 if (inuse == NULL)
2549 return -ENOMEM;
2550 cont:
2551 list_for_each_entry(i, &ctx->table->sets, list) {
2552 int tmp;
2553
2554 if (!nft_is_active_next(ctx->net, set))
2555 continue;
2556 if (!sscanf(i->name, name, &tmp))
2557 continue;
2558 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2559 continue;
2560
2561 set_bit(tmp - min, inuse);
2562 }
2563
2564 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2565 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2566 min += BITS_PER_BYTE * PAGE_SIZE;
2567 memset(inuse, 0, PAGE_SIZE);
2568 goto cont;
2569 }
2570 free_page((unsigned long)inuse);
2571 }
2572
2573 snprintf(set->name, sizeof(set->name), name, min + n);
2574 list_for_each_entry(i, &ctx->table->sets, list) {
2575 if (!nft_is_active_next(ctx->net, i))
2576 continue;
2577 if (!strcmp(set->name, i->name))
2578 return -ENFILE;
2579 }
2580 return 0;
2581 }
2582
2583 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2584 const struct nft_set *set, u16 event, u16 flags)
2585 {
2586 struct nfgenmsg *nfmsg;
2587 struct nlmsghdr *nlh;
2588 struct nlattr *desc;
2589 u32 portid = ctx->portid;
2590 u32 seq = ctx->seq;
2591
2592 event |= NFNL_SUBSYS_NFTABLES << 8;
2593 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2594 flags);
2595 if (nlh == NULL)
2596 goto nla_put_failure;
2597
2598 nfmsg = nlmsg_data(nlh);
2599 nfmsg->nfgen_family = ctx->afi->family;
2600 nfmsg->version = NFNETLINK_V0;
2601 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2602
2603 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2604 goto nla_put_failure;
2605 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2606 goto nla_put_failure;
2607 if (set->flags != 0)
2608 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2609 goto nla_put_failure;
2610
2611 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2612 goto nla_put_failure;
2613 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2614 goto nla_put_failure;
2615 if (set->flags & NFT_SET_MAP) {
2616 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2617 goto nla_put_failure;
2618 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2619 goto nla_put_failure;
2620 }
2621 if (set->flags & NFT_SET_OBJECT &&
2622 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
2623 goto nla_put_failure;
2624
2625 if (set->timeout &&
2626 nla_put_be64(skb, NFTA_SET_TIMEOUT,
2627 cpu_to_be64(jiffies_to_msecs(set->timeout)),
2628 NFTA_SET_PAD))
2629 goto nla_put_failure;
2630 if (set->gc_int &&
2631 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2632 goto nla_put_failure;
2633
2634 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2635 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2636 goto nla_put_failure;
2637 }
2638
2639 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2640 goto nla_put_failure;
2641
2642 desc = nla_nest_start(skb, NFTA_SET_DESC);
2643 if (desc == NULL)
2644 goto nla_put_failure;
2645 if (set->size &&
2646 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2647 goto nla_put_failure;
2648 nla_nest_end(skb, desc);
2649
2650 nlmsg_end(skb, nlh);
2651 return 0;
2652
2653 nla_put_failure:
2654 nlmsg_trim(skb, nlh);
2655 return -1;
2656 }
2657
2658 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2659 const struct nft_set *set,
2660 int event, gfp_t gfp_flags)
2661 {
2662 struct sk_buff *skb;
2663 u32 portid = ctx->portid;
2664 int err;
2665
2666 if (!ctx->report &&
2667 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2668 return 0;
2669
2670 err = -ENOBUFS;
2671 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2672 if (skb == NULL)
2673 goto err;
2674
2675 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2676 if (err < 0) {
2677 kfree_skb(skb);
2678 goto err;
2679 }
2680
2681 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2682 ctx->report, gfp_flags);
2683 err:
2684 if (err < 0)
2685 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2686 return err;
2687 }
2688
2689 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2690 {
2691 const struct nft_set *set;
2692 unsigned int idx, s_idx = cb->args[0];
2693 struct nft_af_info *afi;
2694 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2695 struct net *net = sock_net(skb->sk);
2696 int cur_family = cb->args[3];
2697 struct nft_ctx *ctx = cb->data, ctx_set;
2698
2699 if (cb->args[1])
2700 return skb->len;
2701
2702 rcu_read_lock();
2703 cb->seq = net->nft.base_seq;
2704
2705 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2706 if (ctx->afi && ctx->afi != afi)
2707 continue;
2708
2709 if (cur_family) {
2710 if (afi->family != cur_family)
2711 continue;
2712
2713 cur_family = 0;
2714 }
2715 list_for_each_entry_rcu(table, &afi->tables, list) {
2716 if (ctx->table && ctx->table != table)
2717 continue;
2718
2719 if (cur_table) {
2720 if (cur_table != table)
2721 continue;
2722
2723 cur_table = NULL;
2724 }
2725 idx = 0;
2726 list_for_each_entry_rcu(set, &table->sets, list) {
2727 if (idx < s_idx)
2728 goto cont;
2729 if (!nft_is_active(net, set))
2730 goto cont;
2731
2732 ctx_set = *ctx;
2733 ctx_set.table = table;
2734 ctx_set.afi = afi;
2735 if (nf_tables_fill_set(skb, &ctx_set, set,
2736 NFT_MSG_NEWSET,
2737 NLM_F_MULTI) < 0) {
2738 cb->args[0] = idx;
2739 cb->args[2] = (unsigned long) table;
2740 cb->args[3] = afi->family;
2741 goto done;
2742 }
2743 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2744 cont:
2745 idx++;
2746 }
2747 if (s_idx)
2748 s_idx = 0;
2749 }
2750 }
2751 cb->args[1] = 1;
2752 done:
2753 rcu_read_unlock();
2754 return skb->len;
2755 }
2756
2757 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2758 {
2759 kfree(cb->data);
2760 return 0;
2761 }
2762
2763 static int nf_tables_getset(struct net *net, struct sock *nlsk,
2764 struct sk_buff *skb, const struct nlmsghdr *nlh,
2765 const struct nlattr * const nla[])
2766 {
2767 u8 genmask = nft_genmask_cur(net);
2768 const struct nft_set *set;
2769 struct nft_ctx ctx;
2770 struct sk_buff *skb2;
2771 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2772 int err;
2773
2774 /* Verify existence before starting dump */
2775 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
2776 if (err < 0)
2777 return err;
2778
2779 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2780 struct netlink_dump_control c = {
2781 .dump = nf_tables_dump_sets,
2782 .done = nf_tables_dump_sets_done,
2783 };
2784 struct nft_ctx *ctx_dump;
2785
2786 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2787 if (ctx_dump == NULL)
2788 return -ENOMEM;
2789
2790 *ctx_dump = ctx;
2791 c.data = ctx_dump;
2792
2793 return netlink_dump_start(nlsk, skb, nlh, &c);
2794 }
2795
2796 /* Only accept unspec with dump */
2797 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2798 return -EAFNOSUPPORT;
2799 if (!nla[NFTA_SET_TABLE])
2800 return -EINVAL;
2801
2802 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
2803 if (IS_ERR(set))
2804 return PTR_ERR(set);
2805
2806 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2807 if (skb2 == NULL)
2808 return -ENOMEM;
2809
2810 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2811 if (err < 0)
2812 goto err;
2813
2814 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2815
2816 err:
2817 kfree_skb(skb2);
2818 return err;
2819 }
2820
2821 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2822 struct nft_set_desc *desc,
2823 const struct nlattr *nla)
2824 {
2825 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2826 int err;
2827
2828 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2829 if (err < 0)
2830 return err;
2831
2832 if (da[NFTA_SET_DESC_SIZE] != NULL)
2833 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2834
2835 return 0;
2836 }
2837
2838 static int nf_tables_newset(struct net *net, struct sock *nlsk,
2839 struct sk_buff *skb, const struct nlmsghdr *nlh,
2840 const struct nlattr * const nla[])
2841 {
2842 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2843 u8 genmask = nft_genmask_next(net);
2844 const struct nft_set_ops *ops;
2845 struct nft_af_info *afi;
2846 struct nft_table *table;
2847 struct nft_set *set;
2848 struct nft_ctx ctx;
2849 char name[NFT_SET_MAXNAMELEN];
2850 unsigned int size;
2851 bool create;
2852 u64 timeout;
2853 u32 ktype, dtype, flags, policy, gc_int, objtype;
2854 struct nft_set_desc desc;
2855 unsigned char *udata;
2856 u16 udlen;
2857 int err;
2858
2859 if (nla[NFTA_SET_TABLE] == NULL ||
2860 nla[NFTA_SET_NAME] == NULL ||
2861 nla[NFTA_SET_KEY_LEN] == NULL ||
2862 nla[NFTA_SET_ID] == NULL)
2863 return -EINVAL;
2864
2865 memset(&desc, 0, sizeof(desc));
2866
2867 ktype = NFT_DATA_VALUE;
2868 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2869 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2870 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2871 return -EINVAL;
2872 }
2873
2874 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2875 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
2876 return -EINVAL;
2877
2878 flags = 0;
2879 if (nla[NFTA_SET_FLAGS] != NULL) {
2880 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2881 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2882 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2883 NFT_SET_MAP | NFT_SET_EVAL |
2884 NFT_SET_OBJECT))
2885 return -EINVAL;
2886 /* Only one of these operations is supported */
2887 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
2888 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
2889 return -EOPNOTSUPP;
2890 }
2891
2892 dtype = 0;
2893 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2894 if (!(flags & NFT_SET_MAP))
2895 return -EINVAL;
2896
2897 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2898 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2899 dtype != NFT_DATA_VERDICT)
2900 return -EINVAL;
2901
2902 if (dtype != NFT_DATA_VERDICT) {
2903 if (nla[NFTA_SET_DATA_LEN] == NULL)
2904 return -EINVAL;
2905 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2906 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
2907 return -EINVAL;
2908 } else
2909 desc.dlen = sizeof(struct nft_verdict);
2910 } else if (flags & NFT_SET_MAP)
2911 return -EINVAL;
2912
2913 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
2914 if (!(flags & NFT_SET_OBJECT))
2915 return -EINVAL;
2916
2917 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
2918 if (objtype == NFT_OBJECT_UNSPEC ||
2919 objtype > NFT_OBJECT_MAX)
2920 return -EINVAL;
2921 } else if (flags & NFT_SET_OBJECT)
2922 return -EINVAL;
2923 else
2924 objtype = NFT_OBJECT_UNSPEC;
2925
2926 timeout = 0;
2927 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2928 if (!(flags & NFT_SET_TIMEOUT))
2929 return -EINVAL;
2930 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
2931 nla[NFTA_SET_TIMEOUT])));
2932 }
2933 gc_int = 0;
2934 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2935 if (!(flags & NFT_SET_TIMEOUT))
2936 return -EINVAL;
2937 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2938 }
2939
2940 policy = NFT_SET_POL_PERFORMANCE;
2941 if (nla[NFTA_SET_POLICY] != NULL)
2942 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2943
2944 if (nla[NFTA_SET_DESC] != NULL) {
2945 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2946 if (err < 0)
2947 return err;
2948 }
2949
2950 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2951
2952 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2953 if (IS_ERR(afi))
2954 return PTR_ERR(afi);
2955
2956 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
2957 if (IS_ERR(table))
2958 return PTR_ERR(table);
2959
2960 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
2961
2962 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
2963 if (IS_ERR(set)) {
2964 if (PTR_ERR(set) != -ENOENT)
2965 return PTR_ERR(set);
2966 set = NULL;
2967 }
2968
2969 if (set != NULL) {
2970 if (nlh->nlmsg_flags & NLM_F_EXCL)
2971 return -EEXIST;
2972 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2973 return -EOPNOTSUPP;
2974 return 0;
2975 }
2976
2977 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2978 return -ENOENT;
2979
2980 ops = nft_select_set_ops(nla, &desc, policy);
2981 if (IS_ERR(ops))
2982 return PTR_ERR(ops);
2983
2984 udlen = 0;
2985 if (nla[NFTA_SET_USERDATA])
2986 udlen = nla_len(nla[NFTA_SET_USERDATA]);
2987
2988 size = 0;
2989 if (ops->privsize != NULL)
2990 size = ops->privsize(nla);
2991
2992 err = -ENOMEM;
2993 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
2994 if (set == NULL)
2995 goto err1;
2996
2997 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2998 err = nf_tables_set_alloc_name(&ctx, set, name);
2999 if (err < 0)
3000 goto err2;
3001
3002 udata = NULL;
3003 if (udlen) {
3004 udata = set->data + size;
3005 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3006 }
3007
3008 INIT_LIST_HEAD(&set->bindings);
3009 set->ops = ops;
3010 set->ktype = ktype;
3011 set->klen = desc.klen;
3012 set->dtype = dtype;
3013 set->objtype = objtype;
3014 set->dlen = desc.dlen;
3015 set->flags = flags;
3016 set->size = desc.size;
3017 set->policy = policy;
3018 set->udlen = udlen;
3019 set->udata = udata;
3020 set->timeout = timeout;
3021 set->gc_int = gc_int;
3022
3023 err = ops->init(set, &desc, nla);
3024 if (err < 0)
3025 goto err2;
3026
3027 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3028 if (err < 0)
3029 goto err3;
3030
3031 list_add_tail_rcu(&set->list, &table->sets);
3032 table->use++;
3033 return 0;
3034
3035 err3:
3036 ops->destroy(set);
3037 err2:
3038 kfree(set);
3039 err1:
3040 module_put(ops->owner);
3041 return err;
3042 }
3043
3044 static void nft_set_destroy(struct nft_set *set)
3045 {
3046 set->ops->destroy(set);
3047 module_put(set->ops->owner);
3048 kfree(set);
3049 }
3050
3051 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3052 {
3053 list_del_rcu(&set->list);
3054 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
3055 nft_set_destroy(set);
3056 }
3057
3058 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3059 struct sk_buff *skb, const struct nlmsghdr *nlh,
3060 const struct nlattr * const nla[])
3061 {
3062 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3063 u8 genmask = nft_genmask_next(net);
3064 struct nft_set *set;
3065 struct nft_ctx ctx;
3066 int err;
3067
3068 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3069 return -EAFNOSUPPORT;
3070 if (nla[NFTA_SET_TABLE] == NULL)
3071 return -EINVAL;
3072
3073 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
3074 if (err < 0)
3075 return err;
3076
3077 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3078 if (IS_ERR(set))
3079 return PTR_ERR(set);
3080 if (!list_empty(&set->bindings))
3081 return -EBUSY;
3082
3083 return nft_delset(&ctx, set);
3084 }
3085
3086 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3087 const struct nft_set *set,
3088 const struct nft_set_iter *iter,
3089 const struct nft_set_elem *elem)
3090 {
3091 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3092 enum nft_registers dreg;
3093
3094 dreg = nft_type_to_reg(set->dtype);
3095 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3096 set->dtype == NFT_DATA_VERDICT ?
3097 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3098 set->dlen);
3099 }
3100
3101 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3102 struct nft_set_binding *binding)
3103 {
3104 struct nft_set_binding *i;
3105 struct nft_set_iter iter;
3106
3107 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
3108 return -EBUSY;
3109
3110 if (binding->flags & NFT_SET_MAP) {
3111 /* If the set is already bound to the same chain all
3112 * jumps are already validated for that chain.
3113 */
3114 list_for_each_entry(i, &set->bindings, list) {
3115 if (i->flags & NFT_SET_MAP &&
3116 i->chain == binding->chain)
3117 goto bind;
3118 }
3119
3120 iter.genmask = nft_genmask_next(ctx->net);
3121 iter.skip = 0;
3122 iter.count = 0;
3123 iter.err = 0;
3124 iter.fn = nf_tables_bind_check_setelem;
3125
3126 set->ops->walk(ctx, set, &iter);
3127 if (iter.err < 0)
3128 return iter.err;
3129 }
3130 bind:
3131 binding->chain = ctx->chain;
3132 list_add_tail_rcu(&binding->list, &set->bindings);
3133 return 0;
3134 }
3135 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3136
3137 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3138 struct nft_set_binding *binding)
3139 {
3140 list_del_rcu(&binding->list);
3141
3142 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
3143 nft_is_active(ctx->net, set))
3144 nf_tables_set_destroy(ctx, set);
3145 }
3146 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3147
3148 const struct nft_set_ext_type nft_set_ext_types[] = {
3149 [NFT_SET_EXT_KEY] = {
3150 .align = __alignof__(u32),
3151 },
3152 [NFT_SET_EXT_DATA] = {
3153 .align = __alignof__(u32),
3154 },
3155 [NFT_SET_EXT_EXPR] = {
3156 .align = __alignof__(struct nft_expr),
3157 },
3158 [NFT_SET_EXT_OBJREF] = {
3159 .len = sizeof(struct nft_object *),
3160 .align = __alignof__(struct nft_object *),
3161 },
3162 [NFT_SET_EXT_FLAGS] = {
3163 .len = sizeof(u8),
3164 .align = __alignof__(u8),
3165 },
3166 [NFT_SET_EXT_TIMEOUT] = {
3167 .len = sizeof(u64),
3168 .align = __alignof__(u64),
3169 },
3170 [NFT_SET_EXT_EXPIRATION] = {
3171 .len = sizeof(unsigned long),
3172 .align = __alignof__(unsigned long),
3173 },
3174 [NFT_SET_EXT_USERDATA] = {
3175 .len = sizeof(struct nft_userdata),
3176 .align = __alignof__(struct nft_userdata),
3177 },
3178 };
3179 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3180
3181 /*
3182 * Set elements
3183 */
3184
3185 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3186 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3187 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3188 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3189 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3190 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3191 .len = NFT_USERDATA_MAXLEN },
3192 };
3193
3194 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3195 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
3196 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
3197 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3198 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3199 };
3200
3201 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3202 const struct sk_buff *skb,
3203 const struct nlmsghdr *nlh,
3204 const struct nlattr * const nla[],
3205 u8 genmask)
3206 {
3207 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3208 struct nft_af_info *afi;
3209 struct nft_table *table;
3210
3211 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3212 if (IS_ERR(afi))
3213 return PTR_ERR(afi);
3214
3215 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3216 genmask);
3217 if (IS_ERR(table))
3218 return PTR_ERR(table);
3219
3220 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
3221 return 0;
3222 }
3223
3224 static int nf_tables_fill_setelem(struct sk_buff *skb,
3225 const struct nft_set *set,
3226 const struct nft_set_elem *elem)
3227 {
3228 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3229 unsigned char *b = skb_tail_pointer(skb);
3230 struct nlattr *nest;
3231
3232 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3233 if (nest == NULL)
3234 goto nla_put_failure;
3235
3236 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3237 NFT_DATA_VALUE, set->klen) < 0)
3238 goto nla_put_failure;
3239
3240 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3241 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3242 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3243 set->dlen) < 0)
3244 goto nla_put_failure;
3245
3246 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3247 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3248 goto nla_put_failure;
3249
3250 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3251 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3252 (*nft_set_ext_obj(ext))->name) < 0)
3253 goto nla_put_failure;
3254
3255 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3256 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3257 htonl(*nft_set_ext_flags(ext))))
3258 goto nla_put_failure;
3259
3260 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3261 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3262 cpu_to_be64(jiffies_to_msecs(
3263 *nft_set_ext_timeout(ext))),
3264 NFTA_SET_ELEM_PAD))
3265 goto nla_put_failure;
3266
3267 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3268 unsigned long expires, now = jiffies;
3269
3270 expires = *nft_set_ext_expiration(ext);
3271 if (time_before(now, expires))
3272 expires -= now;
3273 else
3274 expires = 0;
3275
3276 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3277 cpu_to_be64(jiffies_to_msecs(expires)),
3278 NFTA_SET_ELEM_PAD))
3279 goto nla_put_failure;
3280 }
3281
3282 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3283 struct nft_userdata *udata;
3284
3285 udata = nft_set_ext_userdata(ext);
3286 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3287 udata->len + 1, udata->data))
3288 goto nla_put_failure;
3289 }
3290
3291 nla_nest_end(skb, nest);
3292 return 0;
3293
3294 nla_put_failure:
3295 nlmsg_trim(skb, b);
3296 return -EMSGSIZE;
3297 }
3298
3299 struct nft_set_dump_args {
3300 const struct netlink_callback *cb;
3301 struct nft_set_iter iter;
3302 struct sk_buff *skb;
3303 };
3304
3305 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3306 const struct nft_set *set,
3307 const struct nft_set_iter *iter,
3308 const struct nft_set_elem *elem)
3309 {
3310 struct nft_set_dump_args *args;
3311
3312 args = container_of(iter, struct nft_set_dump_args, iter);
3313 return nf_tables_fill_setelem(args->skb, set, elem);
3314 }
3315
3316 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3317 {
3318 struct net *net = sock_net(skb->sk);
3319 u8 genmask = nft_genmask_cur(net);
3320 const struct nft_set *set;
3321 struct nft_set_dump_args args;
3322 struct nft_ctx ctx;
3323 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3324 struct nfgenmsg *nfmsg;
3325 struct nlmsghdr *nlh;
3326 struct nlattr *nest;
3327 u32 portid, seq;
3328 int event, err;
3329
3330 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3331 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
3332 if (err < 0)
3333 return err;
3334
3335 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
3336 (void *)nla, genmask);
3337 if (err < 0)
3338 return err;
3339
3340 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3341 genmask);
3342 if (IS_ERR(set))
3343 return PTR_ERR(set);
3344
3345 event = NFT_MSG_NEWSETELEM;
3346 event |= NFNL_SUBSYS_NFTABLES << 8;
3347 portid = NETLINK_CB(cb->skb).portid;
3348 seq = cb->nlh->nlmsg_seq;
3349
3350 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3351 NLM_F_MULTI);
3352 if (nlh == NULL)
3353 goto nla_put_failure;
3354
3355 nfmsg = nlmsg_data(nlh);
3356 nfmsg->nfgen_family = ctx.afi->family;
3357 nfmsg->version = NFNETLINK_V0;
3358 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
3359
3360 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3361 goto nla_put_failure;
3362 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3363 goto nla_put_failure;
3364
3365 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3366 if (nest == NULL)
3367 goto nla_put_failure;
3368
3369 args.cb = cb;
3370 args.skb = skb;
3371 args.iter.genmask = nft_genmask_cur(ctx.net);
3372 args.iter.skip = cb->args[0];
3373 args.iter.count = 0;
3374 args.iter.err = 0;
3375 args.iter.fn = nf_tables_dump_setelem;
3376 set->ops->walk(&ctx, set, &args.iter);
3377
3378 nla_nest_end(skb, nest);
3379 nlmsg_end(skb, nlh);
3380
3381 if (args.iter.err && args.iter.err != -EMSGSIZE)
3382 return args.iter.err;
3383 if (args.iter.count == cb->args[0])
3384 return 0;
3385
3386 cb->args[0] = args.iter.count;
3387 return skb->len;
3388
3389 nla_put_failure:
3390 return -ENOSPC;
3391 }
3392
3393 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3394 struct sk_buff *skb, const struct nlmsghdr *nlh,
3395 const struct nlattr * const nla[])
3396 {
3397 u8 genmask = nft_genmask_cur(net);
3398 const struct nft_set *set;
3399 struct nft_ctx ctx;
3400 int err;
3401
3402 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3403 if (err < 0)
3404 return err;
3405
3406 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3407 genmask);
3408 if (IS_ERR(set))
3409 return PTR_ERR(set);
3410
3411 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3412 struct netlink_dump_control c = {
3413 .dump = nf_tables_dump_set,
3414 };
3415 return netlink_dump_start(nlsk, skb, nlh, &c);
3416 }
3417 return -EOPNOTSUPP;
3418 }
3419
3420 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3421 const struct nft_ctx *ctx, u32 seq,
3422 u32 portid, int event, u16 flags,
3423 const struct nft_set *set,
3424 const struct nft_set_elem *elem)
3425 {
3426 struct nfgenmsg *nfmsg;
3427 struct nlmsghdr *nlh;
3428 struct nlattr *nest;
3429 int err;
3430
3431 event |= NFNL_SUBSYS_NFTABLES << 8;
3432 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3433 flags);
3434 if (nlh == NULL)
3435 goto nla_put_failure;
3436
3437 nfmsg = nlmsg_data(nlh);
3438 nfmsg->nfgen_family = ctx->afi->family;
3439 nfmsg->version = NFNETLINK_V0;
3440 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3441
3442 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3443 goto nla_put_failure;
3444 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3445 goto nla_put_failure;
3446
3447 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3448 if (nest == NULL)
3449 goto nla_put_failure;
3450
3451 err = nf_tables_fill_setelem(skb, set, elem);
3452 if (err < 0)
3453 goto nla_put_failure;
3454
3455 nla_nest_end(skb, nest);
3456
3457 nlmsg_end(skb, nlh);
3458 return 0;
3459
3460 nla_put_failure:
3461 nlmsg_trim(skb, nlh);
3462 return -1;
3463 }
3464
3465 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3466 const struct nft_set *set,
3467 const struct nft_set_elem *elem,
3468 int event, u16 flags)
3469 {
3470 struct net *net = ctx->net;
3471 u32 portid = ctx->portid;
3472 struct sk_buff *skb;
3473 int err;
3474
3475 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3476 return 0;
3477
3478 err = -ENOBUFS;
3479 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3480 if (skb == NULL)
3481 goto err;
3482
3483 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3484 set, elem);
3485 if (err < 0) {
3486 kfree_skb(skb);
3487 goto err;
3488 }
3489
3490 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3491 GFP_KERNEL);
3492 err:
3493 if (err < 0)
3494 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3495 return err;
3496 }
3497
3498 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3499 int msg_type,
3500 struct nft_set *set)
3501 {
3502 struct nft_trans *trans;
3503
3504 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3505 if (trans == NULL)
3506 return NULL;
3507
3508 nft_trans_elem_set(trans) = set;
3509 return trans;
3510 }
3511
3512 void *nft_set_elem_init(const struct nft_set *set,
3513 const struct nft_set_ext_tmpl *tmpl,
3514 const u32 *key, const u32 *data,
3515 u64 timeout, gfp_t gfp)
3516 {
3517 struct nft_set_ext *ext;
3518 void *elem;
3519
3520 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3521 if (elem == NULL)
3522 return NULL;
3523
3524 ext = nft_set_elem_ext(set, elem);
3525 nft_set_ext_init(ext, tmpl);
3526
3527 memcpy(nft_set_ext_key(ext), key, set->klen);
3528 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3529 memcpy(nft_set_ext_data(ext), data, set->dlen);
3530 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3531 *nft_set_ext_expiration(ext) =
3532 jiffies + timeout;
3533 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3534 *nft_set_ext_timeout(ext) = timeout;
3535
3536 return elem;
3537 }
3538
3539 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
3540 bool destroy_expr)
3541 {
3542 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3543
3544 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3545 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3546 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
3547 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3548 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3549 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
3550 (*nft_set_ext_obj(ext))->use--;
3551 kfree(elem);
3552 }
3553 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3554
3555 static int nft_setelem_parse_flags(const struct nft_set *set,
3556 const struct nlattr *attr, u32 *flags)
3557 {
3558 if (attr == NULL)
3559 return 0;
3560
3561 *flags = ntohl(nla_get_be32(attr));
3562 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3563 return -EINVAL;
3564 if (!(set->flags & NFT_SET_INTERVAL) &&
3565 *flags & NFT_SET_ELEM_INTERVAL_END)
3566 return -EINVAL;
3567
3568 return 0;
3569 }
3570
3571 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3572 const struct nlattr *attr, u32 nlmsg_flags)
3573 {
3574 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3575 u8 genmask = nft_genmask_next(ctx->net);
3576 struct nft_data_desc d1, d2;
3577 struct nft_set_ext_tmpl tmpl;
3578 struct nft_set_ext *ext, *ext2;
3579 struct nft_set_elem elem;
3580 struct nft_set_binding *binding;
3581 struct nft_object *obj = NULL;
3582 struct nft_userdata *udata;
3583 struct nft_data data;
3584 enum nft_registers dreg;
3585 struct nft_trans *trans;
3586 u32 flags = 0;
3587 u64 timeout;
3588 u8 ulen;
3589 int err;
3590
3591 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3592 nft_set_elem_policy);
3593 if (err < 0)
3594 return err;
3595
3596 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3597 return -EINVAL;
3598
3599 nft_set_ext_prepare(&tmpl);
3600
3601 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3602 if (err < 0)
3603 return err;
3604 if (flags != 0)
3605 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3606
3607 if (set->flags & NFT_SET_MAP) {
3608 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3609 !(flags & NFT_SET_ELEM_INTERVAL_END))
3610 return -EINVAL;
3611 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3612 flags & NFT_SET_ELEM_INTERVAL_END)
3613 return -EINVAL;
3614 } else {
3615 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3616 return -EINVAL;
3617 }
3618
3619 timeout = 0;
3620 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3621 if (!(set->flags & NFT_SET_TIMEOUT))
3622 return -EINVAL;
3623 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3624 nla[NFTA_SET_ELEM_TIMEOUT])));
3625 } else if (set->flags & NFT_SET_TIMEOUT) {
3626 timeout = set->timeout;
3627 }
3628
3629 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3630 nla[NFTA_SET_ELEM_KEY]);
3631 if (err < 0)
3632 goto err1;
3633 err = -EINVAL;
3634 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3635 goto err2;
3636
3637 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3638 if (timeout > 0) {
3639 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3640 if (timeout != set->timeout)
3641 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3642 }
3643
3644 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
3645 if (!(set->flags & NFT_SET_OBJECT)) {
3646 err = -EINVAL;
3647 goto err2;
3648 }
3649 obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
3650 set->objtype, genmask);
3651 if (IS_ERR(obj)) {
3652 err = PTR_ERR(obj);
3653 goto err2;
3654 }
3655 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
3656 }
3657
3658 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3659 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3660 nla[NFTA_SET_ELEM_DATA]);
3661 if (err < 0)
3662 goto err2;
3663
3664 err = -EINVAL;
3665 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3666 goto err3;
3667
3668 dreg = nft_type_to_reg(set->dtype);
3669 list_for_each_entry(binding, &set->bindings, list) {
3670 struct nft_ctx bind_ctx = {
3671 .net = ctx->net,
3672 .afi = ctx->afi,
3673 .table = ctx->table,
3674 .chain = (struct nft_chain *)binding->chain,
3675 };
3676
3677 if (!(binding->flags & NFT_SET_MAP))
3678 continue;
3679
3680 err = nft_validate_register_store(&bind_ctx, dreg,
3681 &data,
3682 d2.type, d2.len);
3683 if (err < 0)
3684 goto err3;
3685 }
3686
3687 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
3688 }
3689
3690 /* The full maximum length of userdata can exceed the maximum
3691 * offset value (U8_MAX) for following extensions, therefor it
3692 * must be the last extension added.
3693 */
3694 ulen = 0;
3695 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3696 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3697 if (ulen > 0)
3698 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3699 ulen);
3700 }
3701
3702 err = -ENOMEM;
3703 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
3704 timeout, GFP_KERNEL);
3705 if (elem.priv == NULL)
3706 goto err3;
3707
3708 ext = nft_set_elem_ext(set, elem.priv);
3709 if (flags)
3710 *nft_set_ext_flags(ext) = flags;
3711 if (ulen > 0) {
3712 udata = nft_set_ext_userdata(ext);
3713 udata->len = ulen - 1;
3714 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3715 }
3716 if (obj) {
3717 *nft_set_ext_obj(ext) = obj;
3718 obj->use++;
3719 }
3720
3721 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3722 if (trans == NULL)
3723 goto err4;
3724
3725 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
3726 err = set->ops->insert(ctx->net, set, &elem, &ext2);
3727 if (err) {
3728 if (err == -EEXIST) {
3729 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3730 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
3731 memcmp(nft_set_ext_data(ext),
3732 nft_set_ext_data(ext2), set->dlen) != 0) ||
3733 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3734 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
3735 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
3736 err = -EBUSY;
3737 else if (!(nlmsg_flags & NLM_F_EXCL))
3738 err = 0;
3739 }
3740 goto err5;
3741 }
3742
3743 nft_trans_elem(trans) = elem;
3744 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3745 return 0;
3746
3747 err5:
3748 kfree(trans);
3749 err4:
3750 kfree(elem.priv);
3751 err3:
3752 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3753 nft_data_uninit(&data, d2.type);
3754 err2:
3755 nft_data_uninit(&elem.key.val, d1.type);
3756 err1:
3757 return err;
3758 }
3759
3760 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3761 struct sk_buff *skb, const struct nlmsghdr *nlh,
3762 const struct nlattr * const nla[])
3763 {
3764 u8 genmask = nft_genmask_next(net);
3765 const struct nlattr *attr;
3766 struct nft_set *set;
3767 struct nft_ctx ctx;
3768 int rem, err = 0;
3769
3770 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3771 return -EINVAL;
3772
3773 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3774 if (err < 0)
3775 return err;
3776
3777 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3778 genmask);
3779 if (IS_ERR(set)) {
3780 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3781 set = nf_tables_set_lookup_byid(net,
3782 nla[NFTA_SET_ELEM_LIST_SET_ID],
3783 genmask);
3784 }
3785 if (IS_ERR(set))
3786 return PTR_ERR(set);
3787 }
3788
3789 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3790 return -EBUSY;
3791
3792 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3793 if (set->size &&
3794 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact))
3795 return -ENFILE;
3796
3797 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
3798 if (err < 0) {
3799 atomic_dec(&set->nelems);
3800 break;
3801 }
3802 }
3803 return err;
3804 }
3805
3806 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3807 const struct nlattr *attr)
3808 {
3809 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3810 struct nft_set_ext_tmpl tmpl;
3811 struct nft_data_desc desc;
3812 struct nft_set_elem elem;
3813 struct nft_set_ext *ext;
3814 struct nft_trans *trans;
3815 u32 flags = 0;
3816 void *priv;
3817 int err;
3818
3819 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3820 nft_set_elem_policy);
3821 if (err < 0)
3822 goto err1;
3823
3824 err = -EINVAL;
3825 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3826 goto err1;
3827
3828 nft_set_ext_prepare(&tmpl);
3829
3830 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3831 if (err < 0)
3832 return err;
3833 if (flags != 0)
3834 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3835
3836 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3837 nla[NFTA_SET_ELEM_KEY]);
3838 if (err < 0)
3839 goto err1;
3840
3841 err = -EINVAL;
3842 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3843 goto err2;
3844
3845 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3846
3847 err = -ENOMEM;
3848 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3849 GFP_KERNEL);
3850 if (elem.priv == NULL)
3851 goto err2;
3852
3853 ext = nft_set_elem_ext(set, elem.priv);
3854 if (flags)
3855 *nft_set_ext_flags(ext) = flags;
3856
3857 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3858 if (trans == NULL) {
3859 err = -ENOMEM;
3860 goto err3;
3861 }
3862
3863 priv = set->ops->deactivate(ctx->net, set, &elem);
3864 if (priv == NULL) {
3865 err = -ENOENT;
3866 goto err4;
3867 }
3868 kfree(elem.priv);
3869 elem.priv = priv;
3870
3871 nft_trans_elem(trans) = elem;
3872 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3873 return 0;
3874
3875 err4:
3876 kfree(trans);
3877 err3:
3878 kfree(elem.priv);
3879 err2:
3880 nft_data_uninit(&elem.key.val, desc.type);
3881 err1:
3882 return err;
3883 }
3884
3885 static int nft_flush_set(const struct nft_ctx *ctx,
3886 const struct nft_set *set,
3887 const struct nft_set_iter *iter,
3888 const struct nft_set_elem *elem)
3889 {
3890 struct nft_trans *trans;
3891 int err;
3892
3893 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
3894 sizeof(struct nft_trans_elem), GFP_ATOMIC);
3895 if (!trans)
3896 return -ENOMEM;
3897
3898 if (!set->ops->deactivate_one(ctx->net, set, elem->priv)) {
3899 err = -ENOENT;
3900 goto err1;
3901 }
3902
3903 nft_trans_elem_set(trans) = (struct nft_set *)set;
3904 nft_trans_elem(trans) = *((struct nft_set_elem *)elem);
3905 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3906
3907 return 0;
3908 err1:
3909 kfree(trans);
3910 return err;
3911 }
3912
3913 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3914 struct sk_buff *skb, const struct nlmsghdr *nlh,
3915 const struct nlattr * const nla[])
3916 {
3917 u8 genmask = nft_genmask_next(net);
3918 const struct nlattr *attr;
3919 struct nft_set *set;
3920 struct nft_ctx ctx;
3921 int rem, err = 0;
3922
3923 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3924 if (err < 0)
3925 return err;
3926
3927 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3928 genmask);
3929 if (IS_ERR(set))
3930 return PTR_ERR(set);
3931 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3932 return -EBUSY;
3933
3934 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
3935 struct nft_set_dump_args args = {
3936 .iter = {
3937 .genmask = genmask,
3938 .fn = nft_flush_set,
3939 },
3940 };
3941 set->ops->walk(&ctx, set, &args.iter);
3942
3943 return args.iter.err;
3944 }
3945
3946 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3947 err = nft_del_setelem(&ctx, set, attr);
3948 if (err < 0)
3949 break;
3950
3951 set->ndeact++;
3952 }
3953 return err;
3954 }
3955
3956 void nft_set_gc_batch_release(struct rcu_head *rcu)
3957 {
3958 struct nft_set_gc_batch *gcb;
3959 unsigned int i;
3960
3961 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
3962 for (i = 0; i < gcb->head.cnt; i++)
3963 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
3964 kfree(gcb);
3965 }
3966 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
3967
3968 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
3969 gfp_t gfp)
3970 {
3971 struct nft_set_gc_batch *gcb;
3972
3973 gcb = kzalloc(sizeof(*gcb), gfp);
3974 if (gcb == NULL)
3975 return gcb;
3976 gcb->head.set = set;
3977 return gcb;
3978 }
3979 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
3980
3981 /*
3982 * Stateful objects
3983 */
3984
3985 /**
3986 * nft_register_obj- register nf_tables stateful object type
3987 * @obj: object type
3988 *
3989 * Registers the object type for use with nf_tables. Returns zero on
3990 * success or a negative errno code otherwise.
3991 */
3992 int nft_register_obj(struct nft_object_type *obj_type)
3993 {
3994 if (obj_type->type == NFT_OBJECT_UNSPEC)
3995 return -EINVAL;
3996
3997 nfnl_lock(NFNL_SUBSYS_NFTABLES);
3998 list_add_rcu(&obj_type->list, &nf_tables_objects);
3999 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4000 return 0;
4001 }
4002 EXPORT_SYMBOL_GPL(nft_register_obj);
4003
4004 /**
4005 * nft_unregister_obj - unregister nf_tables object type
4006 * @obj: object type
4007 *
4008 * Unregisters the object type for use with nf_tables.
4009 */
4010 void nft_unregister_obj(struct nft_object_type *obj_type)
4011 {
4012 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4013 list_del_rcu(&obj_type->list);
4014 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4015 }
4016 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4017
4018 struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
4019 const struct nlattr *nla,
4020 u32 objtype, u8 genmask)
4021 {
4022 struct nft_object *obj;
4023
4024 list_for_each_entry(obj, &table->objects, list) {
4025 if (!nla_strcmp(nla, obj->name) &&
4026 objtype == obj->type->type &&
4027 nft_active_genmask(obj, genmask))
4028 return obj;
4029 }
4030 return ERR_PTR(-ENOENT);
4031 }
4032 EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
4033
4034 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4035 [NFTA_OBJ_TABLE] = { .type = NLA_STRING },
4036 [NFTA_OBJ_NAME] = { .type = NLA_STRING },
4037 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4038 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4039 };
4040
4041 static struct nft_object *nft_obj_init(const struct nft_object_type *type,
4042 const struct nlattr *attr)
4043 {
4044 struct nlattr *tb[type->maxattr + 1];
4045 struct nft_object *obj;
4046 int err;
4047
4048 if (attr) {
4049 err = nla_parse_nested(tb, type->maxattr, attr, type->policy);
4050 if (err < 0)
4051 goto err1;
4052 } else {
4053 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4054 }
4055
4056 err = -ENOMEM;
4057 obj = kzalloc(sizeof(struct nft_object) + type->size, GFP_KERNEL);
4058 if (obj == NULL)
4059 goto err1;
4060
4061 err = type->init((const struct nlattr * const *)tb, obj);
4062 if (err < 0)
4063 goto err2;
4064
4065 obj->type = type;
4066 return obj;
4067 err2:
4068 kfree(obj);
4069 err1:
4070 return ERR_PTR(err);
4071 }
4072
4073 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
4074 struct nft_object *obj, bool reset)
4075 {
4076 struct nlattr *nest;
4077
4078 nest = nla_nest_start(skb, attr);
4079 if (!nest)
4080 goto nla_put_failure;
4081 if (obj->type->dump(skb, obj, reset) < 0)
4082 goto nla_put_failure;
4083 nla_nest_end(skb, nest);
4084 return 0;
4085
4086 nla_put_failure:
4087 return -1;
4088 }
4089
4090 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4091 {
4092 const struct nft_object_type *type;
4093
4094 list_for_each_entry(type, &nf_tables_objects, list) {
4095 if (objtype == type->type)
4096 return type;
4097 }
4098 return NULL;
4099 }
4100
4101 static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4102 {
4103 const struct nft_object_type *type;
4104
4105 type = __nft_obj_type_get(objtype);
4106 if (type != NULL && try_module_get(type->owner))
4107 return type;
4108
4109 #ifdef CONFIG_MODULES
4110 if (type == NULL) {
4111 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4112 request_module("nft-obj-%u", objtype);
4113 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4114 if (__nft_obj_type_get(objtype))
4115 return ERR_PTR(-EAGAIN);
4116 }
4117 #endif
4118 return ERR_PTR(-ENOENT);
4119 }
4120
4121 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4122 struct sk_buff *skb, const struct nlmsghdr *nlh,
4123 const struct nlattr * const nla[])
4124 {
4125 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4126 const struct nft_object_type *type;
4127 u8 genmask = nft_genmask_next(net);
4128 int family = nfmsg->nfgen_family;
4129 struct nft_af_info *afi;
4130 struct nft_table *table;
4131 struct nft_object *obj;
4132 struct nft_ctx ctx;
4133 u32 objtype;
4134 int err;
4135
4136 if (!nla[NFTA_OBJ_TYPE] ||
4137 !nla[NFTA_OBJ_NAME] ||
4138 !nla[NFTA_OBJ_DATA])
4139 return -EINVAL;
4140
4141 afi = nf_tables_afinfo_lookup(net, family, true);
4142 if (IS_ERR(afi))
4143 return PTR_ERR(afi);
4144
4145 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4146 if (IS_ERR(table))
4147 return PTR_ERR(table);
4148
4149 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4150 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4151 if (IS_ERR(obj)) {
4152 err = PTR_ERR(obj);
4153 if (err != -ENOENT)
4154 return err;
4155
4156 obj = NULL;
4157 }
4158
4159 if (obj != NULL) {
4160 if (nlh->nlmsg_flags & NLM_F_EXCL)
4161 return -EEXIST;
4162
4163 return 0;
4164 }
4165
4166 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4167
4168 type = nft_obj_type_get(objtype);
4169 if (IS_ERR(type))
4170 return PTR_ERR(type);
4171
4172 obj = nft_obj_init(type, nla[NFTA_OBJ_DATA]);
4173 if (IS_ERR(obj)) {
4174 err = PTR_ERR(obj);
4175 goto err1;
4176 }
4177 obj->table = table;
4178 nla_strlcpy(obj->name, nla[NFTA_OBJ_NAME], NFT_OBJ_MAXNAMELEN);
4179
4180 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4181 if (err < 0)
4182 goto err2;
4183
4184 list_add_tail_rcu(&obj->list, &table->objects);
4185 table->use++;
4186 return 0;
4187 err2:
4188 if (obj->type->destroy)
4189 obj->type->destroy(obj);
4190 kfree(obj);
4191 err1:
4192 module_put(type->owner);
4193 return err;
4194 }
4195
4196 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4197 u32 portid, u32 seq, int event, u32 flags,
4198 int family, const struct nft_table *table,
4199 struct nft_object *obj, bool reset)
4200 {
4201 struct nfgenmsg *nfmsg;
4202 struct nlmsghdr *nlh;
4203
4204 event |= NFNL_SUBSYS_NFTABLES << 8;
4205 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4206 if (nlh == NULL)
4207 goto nla_put_failure;
4208
4209 nfmsg = nlmsg_data(nlh);
4210 nfmsg->nfgen_family = family;
4211 nfmsg->version = NFNETLINK_V0;
4212 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4213
4214 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4215 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
4216 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->type->type)) ||
4217 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
4218 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
4219 goto nla_put_failure;
4220
4221 nlmsg_end(skb, nlh);
4222 return 0;
4223
4224 nla_put_failure:
4225 nlmsg_trim(skb, nlh);
4226 return -1;
4227 }
4228
4229 struct nft_obj_filter {
4230 char table[NFT_OBJ_MAXNAMELEN];
4231 u32 type;
4232 };
4233
4234 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4235 {
4236 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4237 const struct nft_af_info *afi;
4238 const struct nft_table *table;
4239 unsigned int idx = 0, s_idx = cb->args[0];
4240 struct nft_obj_filter *filter = cb->data;
4241 struct net *net = sock_net(skb->sk);
4242 int family = nfmsg->nfgen_family;
4243 struct nft_object *obj;
4244 bool reset = false;
4245
4246 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4247 reset = true;
4248
4249 rcu_read_lock();
4250 cb->seq = net->nft.base_seq;
4251
4252 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
4253 if (family != NFPROTO_UNSPEC && family != afi->family)
4254 continue;
4255
4256 list_for_each_entry_rcu(table, &afi->tables, list) {
4257 list_for_each_entry_rcu(obj, &table->objects, list) {
4258 if (!nft_is_active(net, obj))
4259 goto cont;
4260 if (idx < s_idx)
4261 goto cont;
4262 if (idx > s_idx)
4263 memset(&cb->args[1], 0,
4264 sizeof(cb->args) - sizeof(cb->args[0]));
4265 if (filter->table[0] &&
4266 strcmp(filter->table, table->name))
4267 goto cont;
4268 if (filter->type != NFT_OBJECT_UNSPEC &&
4269 obj->type->type != filter->type)
4270 goto cont;
4271
4272 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4273 cb->nlh->nlmsg_seq,
4274 NFT_MSG_NEWOBJ,
4275 NLM_F_MULTI | NLM_F_APPEND,
4276 afi->family, table, obj, reset) < 0)
4277 goto done;
4278
4279 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4280 cont:
4281 idx++;
4282 }
4283 }
4284 }
4285 done:
4286 rcu_read_unlock();
4287
4288 cb->args[0] = idx;
4289 return skb->len;
4290 }
4291
4292 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4293 {
4294 kfree(cb->data);
4295
4296 return 0;
4297 }
4298
4299 static struct nft_obj_filter *
4300 nft_obj_filter_alloc(const struct nlattr * const nla[])
4301 {
4302 struct nft_obj_filter *filter;
4303
4304 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
4305 if (!filter)
4306 return ERR_PTR(-ENOMEM);
4307
4308 if (nla[NFTA_OBJ_TABLE])
4309 nla_strlcpy(filter->table, nla[NFTA_OBJ_TABLE],
4310 NFT_TABLE_MAXNAMELEN);
4311 if (nla[NFTA_OBJ_TYPE])
4312 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4313
4314 return filter;
4315 }
4316
4317 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
4318 struct sk_buff *skb, const struct nlmsghdr *nlh,
4319 const struct nlattr * const nla[])
4320 {
4321 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4322 u8 genmask = nft_genmask_cur(net);
4323 int family = nfmsg->nfgen_family;
4324 const struct nft_af_info *afi;
4325 const struct nft_table *table;
4326 struct nft_object *obj;
4327 struct sk_buff *skb2;
4328 bool reset = false;
4329 u32 objtype;
4330 int err;
4331
4332 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4333 struct netlink_dump_control c = {
4334 .dump = nf_tables_dump_obj,
4335 .done = nf_tables_dump_obj_done,
4336 };
4337
4338 if (nla[NFTA_OBJ_TABLE] ||
4339 nla[NFTA_OBJ_TYPE]) {
4340 struct nft_obj_filter *filter;
4341
4342 filter = nft_obj_filter_alloc(nla);
4343 if (IS_ERR(filter))
4344 return -ENOMEM;
4345
4346 c.data = filter;
4347 }
4348 return netlink_dump_start(nlsk, skb, nlh, &c);
4349 }
4350
4351 if (!nla[NFTA_OBJ_NAME] ||
4352 !nla[NFTA_OBJ_TYPE])
4353 return -EINVAL;
4354
4355 afi = nf_tables_afinfo_lookup(net, family, false);
4356 if (IS_ERR(afi))
4357 return PTR_ERR(afi);
4358
4359 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4360 if (IS_ERR(table))
4361 return PTR_ERR(table);
4362
4363 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4364 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4365 if (IS_ERR(obj))
4366 return PTR_ERR(obj);
4367
4368 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4369 if (!skb2)
4370 return -ENOMEM;
4371
4372 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4373 reset = true;
4374
4375 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
4376 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
4377 family, table, obj, reset);
4378 if (err < 0)
4379 goto err;
4380
4381 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4382 err:
4383 kfree_skb(skb2);
4384 return err;
4385
4386 return 0;
4387 }
4388
4389 static void nft_obj_destroy(struct nft_object *obj)
4390 {
4391 if (obj->type->destroy)
4392 obj->type->destroy(obj);
4393
4394 module_put(obj->type->owner);
4395 kfree(obj);
4396 }
4397
4398 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
4399 struct sk_buff *skb, const struct nlmsghdr *nlh,
4400 const struct nlattr * const nla[])
4401 {
4402 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4403 u8 genmask = nft_genmask_next(net);
4404 int family = nfmsg->nfgen_family;
4405 struct nft_af_info *afi;
4406 struct nft_table *table;
4407 struct nft_object *obj;
4408 struct nft_ctx ctx;
4409 u32 objtype;
4410
4411 if (!nla[NFTA_OBJ_TYPE] ||
4412 !nla[NFTA_OBJ_NAME])
4413 return -EINVAL;
4414
4415 afi = nf_tables_afinfo_lookup(net, family, true);
4416 if (IS_ERR(afi))
4417 return PTR_ERR(afi);
4418
4419 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4420 if (IS_ERR(table))
4421 return PTR_ERR(table);
4422
4423 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4424 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4425 if (IS_ERR(obj))
4426 return PTR_ERR(obj);
4427 if (obj->use > 0)
4428 return -EBUSY;
4429
4430 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4431
4432 return nft_delobj(&ctx, obj);
4433 }
4434
4435 int nft_obj_notify(struct net *net, struct nft_table *table,
4436 struct nft_object *obj, u32 portid, u32 seq, int event,
4437 int family, int report, gfp_t gfp)
4438 {
4439 struct sk_buff *skb;
4440 int err;
4441
4442 if (!report &&
4443 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4444 return 0;
4445
4446 err = -ENOBUFS;
4447 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
4448 if (skb == NULL)
4449 goto err;
4450
4451 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
4452 table, obj, false);
4453 if (err < 0) {
4454 kfree_skb(skb);
4455 goto err;
4456 }
4457
4458 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
4459 err:
4460 if (err < 0) {
4461 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
4462 }
4463 return err;
4464 }
4465 EXPORT_SYMBOL_GPL(nft_obj_notify);
4466
4467 static int nf_tables_obj_notify(const struct nft_ctx *ctx,
4468 struct nft_object *obj, int event)
4469 {
4470 return nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
4471 ctx->seq, event, ctx->afi->family, ctx->report,
4472 GFP_KERNEL);
4473 }
4474
4475 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
4476 u32 portid, u32 seq)
4477 {
4478 struct nlmsghdr *nlh;
4479 struct nfgenmsg *nfmsg;
4480 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
4481
4482 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
4483 if (nlh == NULL)
4484 goto nla_put_failure;
4485
4486 nfmsg = nlmsg_data(nlh);
4487 nfmsg->nfgen_family = AF_UNSPEC;
4488 nfmsg->version = NFNETLINK_V0;
4489 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4490
4491 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
4492 goto nla_put_failure;
4493
4494 nlmsg_end(skb, nlh);
4495 return 0;
4496
4497 nla_put_failure:
4498 nlmsg_trim(skb, nlh);
4499 return -EMSGSIZE;
4500 }
4501
4502 static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
4503 {
4504 struct nlmsghdr *nlh = nlmsg_hdr(skb);
4505 struct sk_buff *skb2;
4506 int err;
4507
4508 if (nlmsg_report(nlh) &&
4509 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4510 return 0;
4511
4512 err = -ENOBUFS;
4513 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4514 if (skb2 == NULL)
4515 goto err;
4516
4517 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4518 nlh->nlmsg_seq);
4519 if (err < 0) {
4520 kfree_skb(skb2);
4521 goto err;
4522 }
4523
4524 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
4525 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
4526 err:
4527 if (err < 0) {
4528 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4529 err);
4530 }
4531 return err;
4532 }
4533
4534 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
4535 struct sk_buff *skb, const struct nlmsghdr *nlh,
4536 const struct nlattr * const nla[])
4537 {
4538 struct sk_buff *skb2;
4539 int err;
4540
4541 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4542 if (skb2 == NULL)
4543 return -ENOMEM;
4544
4545 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4546 nlh->nlmsg_seq);
4547 if (err < 0)
4548 goto err;
4549
4550 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4551 err:
4552 kfree_skb(skb2);
4553 return err;
4554 }
4555
4556 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
4557 [NFT_MSG_NEWTABLE] = {
4558 .call_batch = nf_tables_newtable,
4559 .attr_count = NFTA_TABLE_MAX,
4560 .policy = nft_table_policy,
4561 },
4562 [NFT_MSG_GETTABLE] = {
4563 .call = nf_tables_gettable,
4564 .attr_count = NFTA_TABLE_MAX,
4565 .policy = nft_table_policy,
4566 },
4567 [NFT_MSG_DELTABLE] = {
4568 .call_batch = nf_tables_deltable,
4569 .attr_count = NFTA_TABLE_MAX,
4570 .policy = nft_table_policy,
4571 },
4572 [NFT_MSG_NEWCHAIN] = {
4573 .call_batch = nf_tables_newchain,
4574 .attr_count = NFTA_CHAIN_MAX,
4575 .policy = nft_chain_policy,
4576 },
4577 [NFT_MSG_GETCHAIN] = {
4578 .call = nf_tables_getchain,
4579 .attr_count = NFTA_CHAIN_MAX,
4580 .policy = nft_chain_policy,
4581 },
4582 [NFT_MSG_DELCHAIN] = {
4583 .call_batch = nf_tables_delchain,
4584 .attr_count = NFTA_CHAIN_MAX,
4585 .policy = nft_chain_policy,
4586 },
4587 [NFT_MSG_NEWRULE] = {
4588 .call_batch = nf_tables_newrule,
4589 .attr_count = NFTA_RULE_MAX,
4590 .policy = nft_rule_policy,
4591 },
4592 [NFT_MSG_GETRULE] = {
4593 .call = nf_tables_getrule,
4594 .attr_count = NFTA_RULE_MAX,
4595 .policy = nft_rule_policy,
4596 },
4597 [NFT_MSG_DELRULE] = {
4598 .call_batch = nf_tables_delrule,
4599 .attr_count = NFTA_RULE_MAX,
4600 .policy = nft_rule_policy,
4601 },
4602 [NFT_MSG_NEWSET] = {
4603 .call_batch = nf_tables_newset,
4604 .attr_count = NFTA_SET_MAX,
4605 .policy = nft_set_policy,
4606 },
4607 [NFT_MSG_GETSET] = {
4608 .call = nf_tables_getset,
4609 .attr_count = NFTA_SET_MAX,
4610 .policy = nft_set_policy,
4611 },
4612 [NFT_MSG_DELSET] = {
4613 .call_batch = nf_tables_delset,
4614 .attr_count = NFTA_SET_MAX,
4615 .policy = nft_set_policy,
4616 },
4617 [NFT_MSG_NEWSETELEM] = {
4618 .call_batch = nf_tables_newsetelem,
4619 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4620 .policy = nft_set_elem_list_policy,
4621 },
4622 [NFT_MSG_GETSETELEM] = {
4623 .call = nf_tables_getsetelem,
4624 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4625 .policy = nft_set_elem_list_policy,
4626 },
4627 [NFT_MSG_DELSETELEM] = {
4628 .call_batch = nf_tables_delsetelem,
4629 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4630 .policy = nft_set_elem_list_policy,
4631 },
4632 [NFT_MSG_GETGEN] = {
4633 .call = nf_tables_getgen,
4634 },
4635 [NFT_MSG_NEWOBJ] = {
4636 .call_batch = nf_tables_newobj,
4637 .attr_count = NFTA_OBJ_MAX,
4638 .policy = nft_obj_policy,
4639 },
4640 [NFT_MSG_GETOBJ] = {
4641 .call = nf_tables_getobj,
4642 .attr_count = NFTA_OBJ_MAX,
4643 .policy = nft_obj_policy,
4644 },
4645 [NFT_MSG_DELOBJ] = {
4646 .call_batch = nf_tables_delobj,
4647 .attr_count = NFTA_OBJ_MAX,
4648 .policy = nft_obj_policy,
4649 },
4650 [NFT_MSG_GETOBJ_RESET] = {
4651 .call = nf_tables_getobj,
4652 .attr_count = NFTA_OBJ_MAX,
4653 .policy = nft_obj_policy,
4654 },
4655 };
4656
4657 static void nft_chain_commit_update(struct nft_trans *trans)
4658 {
4659 struct nft_base_chain *basechain;
4660
4661 if (nft_trans_chain_name(trans)[0])
4662 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
4663
4664 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
4665 return;
4666
4667 basechain = nft_base_chain(trans->ctx.chain);
4668 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
4669
4670 switch (nft_trans_chain_policy(trans)) {
4671 case NF_DROP:
4672 case NF_ACCEPT:
4673 basechain->policy = nft_trans_chain_policy(trans);
4674 break;
4675 }
4676 }
4677
4678 static void nf_tables_commit_release(struct nft_trans *trans)
4679 {
4680 switch (trans->msg_type) {
4681 case NFT_MSG_DELTABLE:
4682 nf_tables_table_destroy(&trans->ctx);
4683 break;
4684 case NFT_MSG_DELCHAIN:
4685 nf_tables_chain_destroy(trans->ctx.chain);
4686 break;
4687 case NFT_MSG_DELRULE:
4688 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4689 break;
4690 case NFT_MSG_DELSET:
4691 nft_set_destroy(nft_trans_set(trans));
4692 break;
4693 case NFT_MSG_DELSETELEM:
4694 nft_set_elem_destroy(nft_trans_elem_set(trans),
4695 nft_trans_elem(trans).priv, true);
4696 break;
4697 case NFT_MSG_DELOBJ:
4698 nft_obj_destroy(nft_trans_obj(trans));
4699 break;
4700 }
4701 kfree(trans);
4702 }
4703
4704 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
4705 {
4706 struct nft_trans *trans, *next;
4707 struct nft_trans_elem *te;
4708
4709 /* Bump generation counter, invalidate any dump in progress */
4710 while (++net->nft.base_seq == 0);
4711
4712 /* A new generation has just started */
4713 net->nft.gencursor = nft_gencursor_next(net);
4714
4715 /* Make sure all packets have left the previous generation before
4716 * purging old rules.
4717 */
4718 synchronize_rcu();
4719
4720 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4721 switch (trans->msg_type) {
4722 case NFT_MSG_NEWTABLE:
4723 if (nft_trans_table_update(trans)) {
4724 if (!nft_trans_table_enable(trans)) {
4725 nf_tables_table_disable(net,
4726 trans->ctx.afi,
4727 trans->ctx.table);
4728 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4729 }
4730 } else {
4731 nft_clear(net, trans->ctx.table);
4732 }
4733 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
4734 nft_trans_destroy(trans);
4735 break;
4736 case NFT_MSG_DELTABLE:
4737 list_del_rcu(&trans->ctx.table->list);
4738 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
4739 break;
4740 case NFT_MSG_NEWCHAIN:
4741 if (nft_trans_chain_update(trans))
4742 nft_chain_commit_update(trans);
4743 else
4744 nft_clear(net, trans->ctx.chain);
4745
4746 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
4747 nft_trans_destroy(trans);
4748 break;
4749 case NFT_MSG_DELCHAIN:
4750 list_del_rcu(&trans->ctx.chain->list);
4751 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
4752 nf_tables_unregister_hooks(trans->ctx.net,
4753 trans->ctx.table,
4754 trans->ctx.chain,
4755 trans->ctx.afi->nops);
4756 break;
4757 case NFT_MSG_NEWRULE:
4758 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4759 nf_tables_rule_notify(&trans->ctx,
4760 nft_trans_rule(trans),
4761 NFT_MSG_NEWRULE);
4762 nft_trans_destroy(trans);
4763 break;
4764 case NFT_MSG_DELRULE:
4765 list_del_rcu(&nft_trans_rule(trans)->list);
4766 nf_tables_rule_notify(&trans->ctx,
4767 nft_trans_rule(trans),
4768 NFT_MSG_DELRULE);
4769 break;
4770 case NFT_MSG_NEWSET:
4771 nft_clear(net, nft_trans_set(trans));
4772 /* This avoids hitting -EBUSY when deleting the table
4773 * from the transaction.
4774 */
4775 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4776 !list_empty(&nft_trans_set(trans)->bindings))
4777 trans->ctx.table->use--;
4778
4779 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4780 NFT_MSG_NEWSET, GFP_KERNEL);
4781 nft_trans_destroy(trans);
4782 break;
4783 case NFT_MSG_DELSET:
4784 list_del_rcu(&nft_trans_set(trans)->list);
4785 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4786 NFT_MSG_DELSET, GFP_KERNEL);
4787 break;
4788 case NFT_MSG_NEWSETELEM:
4789 te = (struct nft_trans_elem *)trans->data;
4790
4791 te->set->ops->activate(net, te->set, &te->elem);
4792 nf_tables_setelem_notify(&trans->ctx, te->set,
4793 &te->elem,
4794 NFT_MSG_NEWSETELEM, 0);
4795 nft_trans_destroy(trans);
4796 break;
4797 case NFT_MSG_DELSETELEM:
4798 te = (struct nft_trans_elem *)trans->data;
4799
4800 nf_tables_setelem_notify(&trans->ctx, te->set,
4801 &te->elem,
4802 NFT_MSG_DELSETELEM, 0);
4803 te->set->ops->remove(te->set, &te->elem);
4804 atomic_dec(&te->set->nelems);
4805 te->set->ndeact--;
4806 break;
4807 case NFT_MSG_NEWOBJ:
4808 nft_clear(net, nft_trans_obj(trans));
4809 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4810 NFT_MSG_NEWOBJ);
4811 nft_trans_destroy(trans);
4812 break;
4813 case NFT_MSG_DELOBJ:
4814 list_del_rcu(&nft_trans_obj(trans)->list);
4815 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4816 NFT_MSG_DELOBJ);
4817 break;
4818 }
4819 }
4820
4821 synchronize_rcu();
4822
4823 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4824 list_del(&trans->list);
4825 nf_tables_commit_release(trans);
4826 }
4827
4828 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
4829
4830 return 0;
4831 }
4832
4833 static void nf_tables_abort_release(struct nft_trans *trans)
4834 {
4835 switch (trans->msg_type) {
4836 case NFT_MSG_NEWTABLE:
4837 nf_tables_table_destroy(&trans->ctx);
4838 break;
4839 case NFT_MSG_NEWCHAIN:
4840 nf_tables_chain_destroy(trans->ctx.chain);
4841 break;
4842 case NFT_MSG_NEWRULE:
4843 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4844 break;
4845 case NFT_MSG_NEWSET:
4846 nft_set_destroy(nft_trans_set(trans));
4847 break;
4848 case NFT_MSG_NEWSETELEM:
4849 nft_set_elem_destroy(nft_trans_elem_set(trans),
4850 nft_trans_elem(trans).priv, true);
4851 break;
4852 case NFT_MSG_NEWOBJ:
4853 nft_obj_destroy(nft_trans_obj(trans));
4854 break;
4855 }
4856 kfree(trans);
4857 }
4858
4859 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
4860 {
4861 struct nft_trans *trans, *next;
4862 struct nft_trans_elem *te;
4863
4864 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4865 list) {
4866 switch (trans->msg_type) {
4867 case NFT_MSG_NEWTABLE:
4868 if (nft_trans_table_update(trans)) {
4869 if (nft_trans_table_enable(trans)) {
4870 nf_tables_table_disable(net,
4871 trans->ctx.afi,
4872 trans->ctx.table);
4873 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4874 }
4875 nft_trans_destroy(trans);
4876 } else {
4877 list_del_rcu(&trans->ctx.table->list);
4878 }
4879 break;
4880 case NFT_MSG_DELTABLE:
4881 nft_clear(trans->ctx.net, trans->ctx.table);
4882 nft_trans_destroy(trans);
4883 break;
4884 case NFT_MSG_NEWCHAIN:
4885 if (nft_trans_chain_update(trans)) {
4886 free_percpu(nft_trans_chain_stats(trans));
4887
4888 nft_trans_destroy(trans);
4889 } else {
4890 trans->ctx.table->use--;
4891 list_del_rcu(&trans->ctx.chain->list);
4892 nf_tables_unregister_hooks(trans->ctx.net,
4893 trans->ctx.table,
4894 trans->ctx.chain,
4895 trans->ctx.afi->nops);
4896 }
4897 break;
4898 case NFT_MSG_DELCHAIN:
4899 trans->ctx.table->use++;
4900 nft_clear(trans->ctx.net, trans->ctx.chain);
4901 nft_trans_destroy(trans);
4902 break;
4903 case NFT_MSG_NEWRULE:
4904 trans->ctx.chain->use--;
4905 list_del_rcu(&nft_trans_rule(trans)->list);
4906 break;
4907 case NFT_MSG_DELRULE:
4908 trans->ctx.chain->use++;
4909 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4910 nft_trans_destroy(trans);
4911 break;
4912 case NFT_MSG_NEWSET:
4913 trans->ctx.table->use--;
4914 list_del_rcu(&nft_trans_set(trans)->list);
4915 break;
4916 case NFT_MSG_DELSET:
4917 trans->ctx.table->use++;
4918 nft_clear(trans->ctx.net, nft_trans_set(trans));
4919 nft_trans_destroy(trans);
4920 break;
4921 case NFT_MSG_NEWSETELEM:
4922 te = (struct nft_trans_elem *)trans->data;
4923
4924 te->set->ops->remove(te->set, &te->elem);
4925 atomic_dec(&te->set->nelems);
4926 break;
4927 case NFT_MSG_DELSETELEM:
4928 te = (struct nft_trans_elem *)trans->data;
4929
4930 te->set->ops->activate(net, te->set, &te->elem);
4931 te->set->ndeact--;
4932
4933 nft_trans_destroy(trans);
4934 break;
4935 case NFT_MSG_NEWOBJ:
4936 trans->ctx.table->use--;
4937 list_del_rcu(&nft_trans_obj(trans)->list);
4938 break;
4939 case NFT_MSG_DELOBJ:
4940 trans->ctx.table->use++;
4941 nft_clear(trans->ctx.net, nft_trans_obj(trans));
4942 nft_trans_destroy(trans);
4943 break;
4944 }
4945 }
4946
4947 synchronize_rcu();
4948
4949 list_for_each_entry_safe_reverse(trans, next,
4950 &net->nft.commit_list, list) {
4951 list_del(&trans->list);
4952 nf_tables_abort_release(trans);
4953 }
4954
4955 return 0;
4956 }
4957
4958 static const struct nfnetlink_subsystem nf_tables_subsys = {
4959 .name = "nf_tables",
4960 .subsys_id = NFNL_SUBSYS_NFTABLES,
4961 .cb_count = NFT_MSG_MAX,
4962 .cb = nf_tables_cb,
4963 .commit = nf_tables_commit,
4964 .abort = nf_tables_abort,
4965 };
4966
4967 int nft_chain_validate_dependency(const struct nft_chain *chain,
4968 enum nft_chain_type type)
4969 {
4970 const struct nft_base_chain *basechain;
4971
4972 if (chain->flags & NFT_BASE_CHAIN) {
4973 basechain = nft_base_chain(chain);
4974 if (basechain->type->type != type)
4975 return -EOPNOTSUPP;
4976 }
4977 return 0;
4978 }
4979 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
4980
4981 int nft_chain_validate_hooks(const struct nft_chain *chain,
4982 unsigned int hook_flags)
4983 {
4984 struct nft_base_chain *basechain;
4985
4986 if (chain->flags & NFT_BASE_CHAIN) {
4987 basechain = nft_base_chain(chain);
4988
4989 if ((1 << basechain->ops[0].hooknum) & hook_flags)
4990 return 0;
4991
4992 return -EOPNOTSUPP;
4993 }
4994
4995 return 0;
4996 }
4997 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
4998
4999 /*
5000 * Loop detection - walk through the ruleset beginning at the destination chain
5001 * of a new jump until either the source chain is reached (loop) or all
5002 * reachable chains have been traversed.
5003 *
5004 * The loop check is performed whenever a new jump verdict is added to an
5005 * expression or verdict map or a verdict map is bound to a new chain.
5006 */
5007
5008 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5009 const struct nft_chain *chain);
5010
5011 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
5012 const struct nft_set *set,
5013 const struct nft_set_iter *iter,
5014 const struct nft_set_elem *elem)
5015 {
5016 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5017 const struct nft_data *data;
5018
5019 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5020 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
5021 return 0;
5022
5023 data = nft_set_ext_data(ext);
5024 switch (data->verdict.code) {
5025 case NFT_JUMP:
5026 case NFT_GOTO:
5027 return nf_tables_check_loops(ctx, data->verdict.chain);
5028 default:
5029 return 0;
5030 }
5031 }
5032
5033 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5034 const struct nft_chain *chain)
5035 {
5036 const struct nft_rule *rule;
5037 const struct nft_expr *expr, *last;
5038 const struct nft_set *set;
5039 struct nft_set_binding *binding;
5040 struct nft_set_iter iter;
5041
5042 if (ctx->chain == chain)
5043 return -ELOOP;
5044
5045 list_for_each_entry(rule, &chain->rules, list) {
5046 nft_rule_for_each_expr(expr, last, rule) {
5047 const struct nft_data *data = NULL;
5048 int err;
5049
5050 if (!expr->ops->validate)
5051 continue;
5052
5053 err = expr->ops->validate(ctx, expr, &data);
5054 if (err < 0)
5055 return err;
5056
5057 if (data == NULL)
5058 continue;
5059
5060 switch (data->verdict.code) {
5061 case NFT_JUMP:
5062 case NFT_GOTO:
5063 err = nf_tables_check_loops(ctx,
5064 data->verdict.chain);
5065 if (err < 0)
5066 return err;
5067 default:
5068 break;
5069 }
5070 }
5071 }
5072
5073 list_for_each_entry(set, &ctx->table->sets, list) {
5074 if (!nft_is_active_next(ctx->net, set))
5075 continue;
5076 if (!(set->flags & NFT_SET_MAP) ||
5077 set->dtype != NFT_DATA_VERDICT)
5078 continue;
5079
5080 list_for_each_entry(binding, &set->bindings, list) {
5081 if (!(binding->flags & NFT_SET_MAP) ||
5082 binding->chain != chain)
5083 continue;
5084
5085 iter.genmask = nft_genmask_next(ctx->net);
5086 iter.skip = 0;
5087 iter.count = 0;
5088 iter.err = 0;
5089 iter.fn = nf_tables_loop_check_setelem;
5090
5091 set->ops->walk(ctx, set, &iter);
5092 if (iter.err < 0)
5093 return iter.err;
5094 }
5095 }
5096
5097 return 0;
5098 }
5099
5100 /**
5101 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
5102 *
5103 * @attr: netlink attribute to fetch value from
5104 * @max: maximum value to be stored in dest
5105 * @dest: pointer to the variable
5106 *
5107 * Parse, check and store a given u32 netlink attribute into variable.
5108 * This function returns -ERANGE if the value goes over maximum value.
5109 * Otherwise a 0 is returned and the attribute value is stored in the
5110 * destination variable.
5111 */
5112 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
5113 {
5114 u32 val;
5115
5116 val = ntohl(nla_get_be32(attr));
5117 if (val > max)
5118 return -ERANGE;
5119
5120 *dest = val;
5121 return 0;
5122 }
5123 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
5124
5125 /**
5126 * nft_parse_register - parse a register value from a netlink attribute
5127 *
5128 * @attr: netlink attribute
5129 *
5130 * Parse and translate a register value from a netlink attribute.
5131 * Registers used to be 128 bit wide, these register numbers will be
5132 * mapped to the corresponding 32 bit register numbers.
5133 */
5134 unsigned int nft_parse_register(const struct nlattr *attr)
5135 {
5136 unsigned int reg;
5137
5138 reg = ntohl(nla_get_be32(attr));
5139 switch (reg) {
5140 case NFT_REG_VERDICT...NFT_REG_4:
5141 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
5142 default:
5143 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
5144 }
5145 }
5146 EXPORT_SYMBOL_GPL(nft_parse_register);
5147
5148 /**
5149 * nft_dump_register - dump a register value to a netlink attribute
5150 *
5151 * @skb: socket buffer
5152 * @attr: attribute number
5153 * @reg: register number
5154 *
5155 * Construct a netlink attribute containing the register number. For
5156 * compatibility reasons, register numbers being a multiple of 4 are
5157 * translated to the corresponding 128 bit register numbers.
5158 */
5159 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
5160 {
5161 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
5162 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
5163 else
5164 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
5165
5166 return nla_put_be32(skb, attr, htonl(reg));
5167 }
5168 EXPORT_SYMBOL_GPL(nft_dump_register);
5169
5170 /**
5171 * nft_validate_register_load - validate a load from a register
5172 *
5173 * @reg: the register number
5174 * @len: the length of the data
5175 *
5176 * Validate that the input register is one of the general purpose
5177 * registers and that the length of the load is within the bounds.
5178 */
5179 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
5180 {
5181 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5182 return -EINVAL;
5183 if (len == 0)
5184 return -EINVAL;
5185 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
5186 return -ERANGE;
5187
5188 return 0;
5189 }
5190 EXPORT_SYMBOL_GPL(nft_validate_register_load);
5191
5192 /**
5193 * nft_validate_register_store - validate an expressions' register store
5194 *
5195 * @ctx: context of the expression performing the load
5196 * @reg: the destination register number
5197 * @data: the data to load
5198 * @type: the data type
5199 * @len: the length of the data
5200 *
5201 * Validate that a data load uses the appropriate data type for
5202 * the destination register and the length is within the bounds.
5203 * A value of NULL for the data means that its runtime gathered
5204 * data.
5205 */
5206 int nft_validate_register_store(const struct nft_ctx *ctx,
5207 enum nft_registers reg,
5208 const struct nft_data *data,
5209 enum nft_data_types type, unsigned int len)
5210 {
5211 int err;
5212
5213 switch (reg) {
5214 case NFT_REG_VERDICT:
5215 if (type != NFT_DATA_VERDICT)
5216 return -EINVAL;
5217
5218 if (data != NULL &&
5219 (data->verdict.code == NFT_GOTO ||
5220 data->verdict.code == NFT_JUMP)) {
5221 err = nf_tables_check_loops(ctx, data->verdict.chain);
5222 if (err < 0)
5223 return err;
5224
5225 if (ctx->chain->level + 1 >
5226 data->verdict.chain->level) {
5227 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
5228 return -EMLINK;
5229 data->verdict.chain->level = ctx->chain->level + 1;
5230 }
5231 }
5232
5233 return 0;
5234 default:
5235 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5236 return -EINVAL;
5237 if (len == 0)
5238 return -EINVAL;
5239 if (reg * NFT_REG32_SIZE + len >
5240 FIELD_SIZEOF(struct nft_regs, data))
5241 return -ERANGE;
5242
5243 if (data != NULL && type != NFT_DATA_VALUE)
5244 return -EINVAL;
5245 return 0;
5246 }
5247 }
5248 EXPORT_SYMBOL_GPL(nft_validate_register_store);
5249
5250 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
5251 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
5252 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
5253 .len = NFT_CHAIN_MAXNAMELEN - 1 },
5254 };
5255
5256 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
5257 struct nft_data_desc *desc, const struct nlattr *nla)
5258 {
5259 u8 genmask = nft_genmask_next(ctx->net);
5260 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
5261 struct nft_chain *chain;
5262 int err;
5263
5264 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
5265 if (err < 0)
5266 return err;
5267
5268 if (!tb[NFTA_VERDICT_CODE])
5269 return -EINVAL;
5270 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
5271
5272 switch (data->verdict.code) {
5273 default:
5274 switch (data->verdict.code & NF_VERDICT_MASK) {
5275 case NF_ACCEPT:
5276 case NF_DROP:
5277 case NF_QUEUE:
5278 break;
5279 default:
5280 return -EINVAL;
5281 }
5282 /* fall through */
5283 case NFT_CONTINUE:
5284 case NFT_BREAK:
5285 case NFT_RETURN:
5286 break;
5287 case NFT_JUMP:
5288 case NFT_GOTO:
5289 if (!tb[NFTA_VERDICT_CHAIN])
5290 return -EINVAL;
5291 chain = nf_tables_chain_lookup(ctx->table,
5292 tb[NFTA_VERDICT_CHAIN], genmask);
5293 if (IS_ERR(chain))
5294 return PTR_ERR(chain);
5295 if (chain->flags & NFT_BASE_CHAIN)
5296 return -EOPNOTSUPP;
5297
5298 chain->use++;
5299 data->verdict.chain = chain;
5300 break;
5301 }
5302
5303 desc->len = sizeof(data->verdict);
5304 desc->type = NFT_DATA_VERDICT;
5305 return 0;
5306 }
5307
5308 static void nft_verdict_uninit(const struct nft_data *data)
5309 {
5310 switch (data->verdict.code) {
5311 case NFT_JUMP:
5312 case NFT_GOTO:
5313 data->verdict.chain->use--;
5314 break;
5315 }
5316 }
5317
5318 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
5319 {
5320 struct nlattr *nest;
5321
5322 nest = nla_nest_start(skb, type);
5323 if (!nest)
5324 goto nla_put_failure;
5325
5326 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
5327 goto nla_put_failure;
5328
5329 switch (v->code) {
5330 case NFT_JUMP:
5331 case NFT_GOTO:
5332 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
5333 v->chain->name))
5334 goto nla_put_failure;
5335 }
5336 nla_nest_end(skb, nest);
5337 return 0;
5338
5339 nla_put_failure:
5340 return -1;
5341 }
5342
5343 static int nft_value_init(const struct nft_ctx *ctx,
5344 struct nft_data *data, unsigned int size,
5345 struct nft_data_desc *desc, const struct nlattr *nla)
5346 {
5347 unsigned int len;
5348
5349 len = nla_len(nla);
5350 if (len == 0)
5351 return -EINVAL;
5352 if (len > size)
5353 return -EOVERFLOW;
5354
5355 nla_memcpy(data->data, nla, len);
5356 desc->type = NFT_DATA_VALUE;
5357 desc->len = len;
5358 return 0;
5359 }
5360
5361 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
5362 unsigned int len)
5363 {
5364 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
5365 }
5366
5367 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
5368 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
5369 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
5370 };
5371
5372 /**
5373 * nft_data_init - parse nf_tables data netlink attributes
5374 *
5375 * @ctx: context of the expression using the data
5376 * @data: destination struct nft_data
5377 * @size: maximum data length
5378 * @desc: data description
5379 * @nla: netlink attribute containing data
5380 *
5381 * Parse the netlink data attributes and initialize a struct nft_data.
5382 * The type and length of data are returned in the data description.
5383 *
5384 * The caller can indicate that it only wants to accept data of type
5385 * NFT_DATA_VALUE by passing NULL for the ctx argument.
5386 */
5387 int nft_data_init(const struct nft_ctx *ctx,
5388 struct nft_data *data, unsigned int size,
5389 struct nft_data_desc *desc, const struct nlattr *nla)
5390 {
5391 struct nlattr *tb[NFTA_DATA_MAX + 1];
5392 int err;
5393
5394 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
5395 if (err < 0)
5396 return err;
5397
5398 if (tb[NFTA_DATA_VALUE])
5399 return nft_value_init(ctx, data, size, desc,
5400 tb[NFTA_DATA_VALUE]);
5401 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
5402 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
5403 return -EINVAL;
5404 }
5405 EXPORT_SYMBOL_GPL(nft_data_init);
5406
5407 /**
5408 * nft_data_uninit - release a nft_data item
5409 *
5410 * @data: struct nft_data to release
5411 * @type: type of data
5412 *
5413 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5414 * all others need to be released by calling this function.
5415 */
5416 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
5417 {
5418 if (type < NFT_DATA_VERDICT)
5419 return;
5420 switch (type) {
5421 case NFT_DATA_VERDICT:
5422 return nft_verdict_uninit(data);
5423 default:
5424 WARN_ON(1);
5425 }
5426 }
5427 EXPORT_SYMBOL_GPL(nft_data_uninit);
5428
5429 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
5430 enum nft_data_types type, unsigned int len)
5431 {
5432 struct nlattr *nest;
5433 int err;
5434
5435 nest = nla_nest_start(skb, attr);
5436 if (nest == NULL)
5437 return -1;
5438
5439 switch (type) {
5440 case NFT_DATA_VALUE:
5441 err = nft_value_dump(skb, data, len);
5442 break;
5443 case NFT_DATA_VERDICT:
5444 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
5445 break;
5446 default:
5447 err = -EINVAL;
5448 WARN_ON(1);
5449 }
5450
5451 nla_nest_end(skb, nest);
5452 return err;
5453 }
5454 EXPORT_SYMBOL_GPL(nft_data_dump);
5455
5456 static int __net_init nf_tables_init_net(struct net *net)
5457 {
5458 INIT_LIST_HEAD(&net->nft.af_info);
5459 INIT_LIST_HEAD(&net->nft.commit_list);
5460 net->nft.base_seq = 1;
5461 return 0;
5462 }
5463
5464 int __nft_release_basechain(struct nft_ctx *ctx)
5465 {
5466 struct nft_rule *rule, *nr;
5467
5468 BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
5469
5470 nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
5471 ctx->afi->nops);
5472 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
5473 list_del(&rule->list);
5474 ctx->chain->use--;
5475 nf_tables_rule_destroy(ctx, rule);
5476 }
5477 list_del(&ctx->chain->list);
5478 ctx->table->use--;
5479 nf_tables_chain_destroy(ctx->chain);
5480
5481 return 0;
5482 }
5483 EXPORT_SYMBOL_GPL(__nft_release_basechain);
5484
5485 /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
5486 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
5487 {
5488 struct nft_table *table, *nt;
5489 struct nft_chain *chain, *nc;
5490 struct nft_object *obj, *ne;
5491 struct nft_rule *rule, *nr;
5492 struct nft_set *set, *ns;
5493 struct nft_ctx ctx = {
5494 .net = net,
5495 .afi = afi,
5496 };
5497
5498 list_for_each_entry_safe(table, nt, &afi->tables, list) {
5499 list_for_each_entry(chain, &table->chains, list)
5500 nf_tables_unregister_hooks(net, table, chain,
5501 afi->nops);
5502 /* No packets are walking on these chains anymore. */
5503 ctx.table = table;
5504 list_for_each_entry(chain, &table->chains, list) {
5505 ctx.chain = chain;
5506 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
5507 list_del(&rule->list);
5508 chain->use--;
5509 nf_tables_rule_destroy(&ctx, rule);
5510 }
5511 }
5512 list_for_each_entry_safe(set, ns, &table->sets, list) {
5513 list_del(&set->list);
5514 table->use--;
5515 nft_set_destroy(set);
5516 }
5517 list_for_each_entry_safe(obj, ne, &table->objects, list) {
5518 list_del(&obj->list);
5519 table->use--;
5520 nft_obj_destroy(obj);
5521 }
5522 list_for_each_entry_safe(chain, nc, &table->chains, list) {
5523 list_del(&chain->list);
5524 table->use--;
5525 nf_tables_chain_destroy(chain);
5526 }
5527 list_del(&table->list);
5528 nf_tables_table_destroy(&ctx);
5529 }
5530 }
5531
5532 static struct pernet_operations nf_tables_net_ops = {
5533 .init = nf_tables_init_net,
5534 };
5535
5536 static int __init nf_tables_module_init(void)
5537 {
5538 int err;
5539
5540 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
5541 GFP_KERNEL);
5542 if (info == NULL) {
5543 err = -ENOMEM;
5544 goto err1;
5545 }
5546
5547 err = nf_tables_core_module_init();
5548 if (err < 0)
5549 goto err2;
5550
5551 err = nfnetlink_subsys_register(&nf_tables_subsys);
5552 if (err < 0)
5553 goto err3;
5554
5555 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
5556 return register_pernet_subsys(&nf_tables_net_ops);
5557 err3:
5558 nf_tables_core_module_exit();
5559 err2:
5560 kfree(info);
5561 err1:
5562 return err;
5563 }
5564
5565 static void __exit nf_tables_module_exit(void)
5566 {
5567 unregister_pernet_subsys(&nf_tables_net_ops);
5568 nfnetlink_subsys_unregister(&nf_tables_subsys);
5569 rcu_barrier();
5570 nf_tables_core_module_exit();
5571 kfree(info);
5572 }
5573
5574 module_init(nf_tables_module_init);
5575 module_exit(nf_tables_module_exit);
5576
5577 MODULE_LICENSE("GPL");
5578 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
5579 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
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