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netfilter: nf_tables: add check_genid to the nfnetlink subsystem
[mirror_ubuntu-artful-kernel.git] / net / netfilter / nf_tables_api.c
1 /*
2 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
9 */
10
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/list.h>
14 #include <linux/skbuff.h>
15 #include <linux/netlink.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_tables_core.h>
20 #include <net/netfilter/nf_tables.h>
21 #include <net/net_namespace.h>
22 #include <net/sock.h>
23
24 static LIST_HEAD(nf_tables_expressions);
25 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 void _nf_tables_table_disable(struct net *net,
580 const struct nft_af_info *afi,
581 struct nft_table *table,
582 u32 cnt)
583 {
584 struct nft_chain *chain;
585 u32 i = 0;
586
587 list_for_each_entry(chain, &table->chains, list) {
588 if (!nft_is_active_next(net, chain))
589 continue;
590 if (!(chain->flags & NFT_BASE_CHAIN))
591 continue;
592
593 if (cnt && i++ == cnt)
594 break;
595
596 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
597 afi->nops);
598 }
599 }
600
601 static int nf_tables_table_enable(struct net *net,
602 const struct nft_af_info *afi,
603 struct nft_table *table)
604 {
605 struct nft_chain *chain;
606 int err, i = 0;
607
608 list_for_each_entry(chain, &table->chains, list) {
609 if (!nft_is_active_next(net, chain))
610 continue;
611 if (!(chain->flags & NFT_BASE_CHAIN))
612 continue;
613
614 err = nf_register_net_hooks(net, nft_base_chain(chain)->ops,
615 afi->nops);
616 if (err < 0)
617 goto err;
618
619 i++;
620 }
621 return 0;
622 err:
623 if (i)
624 _nf_tables_table_disable(net, afi, table, i);
625 return err;
626 }
627
628 static void nf_tables_table_disable(struct net *net,
629 const struct nft_af_info *afi,
630 struct nft_table *table)
631 {
632 _nf_tables_table_disable(net, afi, table, 0);
633 }
634
635 static int nf_tables_updtable(struct nft_ctx *ctx)
636 {
637 struct nft_trans *trans;
638 u32 flags;
639 int ret = 0;
640
641 if (!ctx->nla[NFTA_TABLE_FLAGS])
642 return 0;
643
644 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
645 if (flags & ~NFT_TABLE_F_DORMANT)
646 return -EINVAL;
647
648 if (flags == ctx->table->flags)
649 return 0;
650
651 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
652 sizeof(struct nft_trans_table));
653 if (trans == NULL)
654 return -ENOMEM;
655
656 if ((flags & NFT_TABLE_F_DORMANT) &&
657 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
658 nft_trans_table_enable(trans) = false;
659 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
660 ctx->table->flags & NFT_TABLE_F_DORMANT) {
661 ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table);
662 if (ret >= 0) {
663 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
664 nft_trans_table_enable(trans) = true;
665 }
666 }
667 if (ret < 0)
668 goto err;
669
670 nft_trans_table_update(trans) = true;
671 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
672 return 0;
673 err:
674 nft_trans_destroy(trans);
675 return ret;
676 }
677
678 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
679 struct sk_buff *skb, const struct nlmsghdr *nlh,
680 const struct nlattr * const nla[])
681 {
682 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
683 u8 genmask = nft_genmask_next(net);
684 const struct nlattr *name;
685 struct nft_af_info *afi;
686 struct nft_table *table;
687 int family = nfmsg->nfgen_family;
688 u32 flags = 0;
689 struct nft_ctx ctx;
690 int err;
691
692 afi = nf_tables_afinfo_lookup(net, family, true);
693 if (IS_ERR(afi))
694 return PTR_ERR(afi);
695
696 name = nla[NFTA_TABLE_NAME];
697 table = nf_tables_table_lookup(afi, name, genmask);
698 if (IS_ERR(table)) {
699 if (PTR_ERR(table) != -ENOENT)
700 return PTR_ERR(table);
701 } else {
702 if (nlh->nlmsg_flags & NLM_F_EXCL)
703 return -EEXIST;
704 if (nlh->nlmsg_flags & NLM_F_REPLACE)
705 return -EOPNOTSUPP;
706
707 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
708 return nf_tables_updtable(&ctx);
709 }
710
711 if (nla[NFTA_TABLE_FLAGS]) {
712 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
713 if (flags & ~NFT_TABLE_F_DORMANT)
714 return -EINVAL;
715 }
716
717 err = -EAFNOSUPPORT;
718 if (!try_module_get(afi->owner))
719 goto err1;
720
721 err = -ENOMEM;
722 table = kzalloc(sizeof(*table), GFP_KERNEL);
723 if (table == NULL)
724 goto err2;
725
726 nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
727 INIT_LIST_HEAD(&table->chains);
728 INIT_LIST_HEAD(&table->sets);
729 INIT_LIST_HEAD(&table->objects);
730 table->flags = flags;
731
732 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
733 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
734 if (err < 0)
735 goto err3;
736
737 list_add_tail_rcu(&table->list, &afi->tables);
738 return 0;
739 err3:
740 kfree(table);
741 err2:
742 module_put(afi->owner);
743 err1:
744 return err;
745 }
746
747 static int nft_flush_table(struct nft_ctx *ctx)
748 {
749 int err;
750 struct nft_chain *chain, *nc;
751 struct nft_object *obj, *ne;
752 struct nft_set *set, *ns;
753
754 list_for_each_entry(chain, &ctx->table->chains, list) {
755 if (!nft_is_active_next(ctx->net, chain))
756 continue;
757
758 ctx->chain = chain;
759
760 err = nft_delrule_by_chain(ctx);
761 if (err < 0)
762 goto out;
763 }
764
765 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
766 if (!nft_is_active_next(ctx->net, set))
767 continue;
768
769 if (set->flags & NFT_SET_ANONYMOUS &&
770 !list_empty(&set->bindings))
771 continue;
772
773 err = nft_delset(ctx, set);
774 if (err < 0)
775 goto out;
776 }
777
778 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
779 err = nft_delobj(ctx, obj);
780 if (err < 0)
781 goto out;
782 }
783
784 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
785 if (!nft_is_active_next(ctx->net, chain))
786 continue;
787
788 ctx->chain = chain;
789
790 err = nft_delchain(ctx);
791 if (err < 0)
792 goto out;
793 }
794
795 err = nft_deltable(ctx);
796 out:
797 return err;
798 }
799
800 static int nft_flush(struct nft_ctx *ctx, int family)
801 {
802 struct nft_af_info *afi;
803 struct nft_table *table, *nt;
804 const struct nlattr * const *nla = ctx->nla;
805 int err = 0;
806
807 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
808 if (family != AF_UNSPEC && afi->family != family)
809 continue;
810
811 ctx->afi = afi;
812 list_for_each_entry_safe(table, nt, &afi->tables, list) {
813 if (!nft_is_active_next(ctx->net, table))
814 continue;
815
816 if (nla[NFTA_TABLE_NAME] &&
817 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
818 continue;
819
820 ctx->table = table;
821
822 err = nft_flush_table(ctx);
823 if (err < 0)
824 goto out;
825 }
826 }
827 out:
828 return err;
829 }
830
831 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
832 struct sk_buff *skb, const struct nlmsghdr *nlh,
833 const struct nlattr * const nla[])
834 {
835 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
836 u8 genmask = nft_genmask_next(net);
837 struct nft_af_info *afi;
838 struct nft_table *table;
839 int family = nfmsg->nfgen_family;
840 struct nft_ctx ctx;
841
842 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
843 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
844 return nft_flush(&ctx, family);
845
846 afi = nf_tables_afinfo_lookup(net, family, false);
847 if (IS_ERR(afi))
848 return PTR_ERR(afi);
849
850 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
851 if (IS_ERR(table))
852 return PTR_ERR(table);
853
854 ctx.afi = afi;
855 ctx.table = table;
856
857 return nft_flush_table(&ctx);
858 }
859
860 static void nf_tables_table_destroy(struct nft_ctx *ctx)
861 {
862 BUG_ON(ctx->table->use > 0);
863
864 kfree(ctx->table);
865 module_put(ctx->afi->owner);
866 }
867
868 int nft_register_chain_type(const struct nf_chain_type *ctype)
869 {
870 int err = 0;
871
872 nfnl_lock(NFNL_SUBSYS_NFTABLES);
873 if (chain_type[ctype->family][ctype->type] != NULL) {
874 err = -EBUSY;
875 goto out;
876 }
877 chain_type[ctype->family][ctype->type] = ctype;
878 out:
879 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
880 return err;
881 }
882 EXPORT_SYMBOL_GPL(nft_register_chain_type);
883
884 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
885 {
886 nfnl_lock(NFNL_SUBSYS_NFTABLES);
887 chain_type[ctype->family][ctype->type] = NULL;
888 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
889 }
890 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
891
892 /*
893 * Chains
894 */
895
896 static struct nft_chain *
897 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle,
898 u8 genmask)
899 {
900 struct nft_chain *chain;
901
902 list_for_each_entry(chain, &table->chains, list) {
903 if (chain->handle == handle &&
904 nft_active_genmask(chain, genmask))
905 return chain;
906 }
907
908 return ERR_PTR(-ENOENT);
909 }
910
911 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
912 const struct nlattr *nla,
913 u8 genmask)
914 {
915 struct nft_chain *chain;
916
917 if (nla == NULL)
918 return ERR_PTR(-EINVAL);
919
920 list_for_each_entry(chain, &table->chains, list) {
921 if (!nla_strcmp(nla, chain->name) &&
922 nft_active_genmask(chain, genmask))
923 return chain;
924 }
925
926 return ERR_PTR(-ENOENT);
927 }
928
929 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
930 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
931 .len = NFT_TABLE_MAXNAMELEN - 1 },
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 .len = NFT_TABLE_MAXNAMELEN - 1 },
1859 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1860 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1861 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1862 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1863 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1864 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1865 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1866 .len = NFT_USERDATA_MAXLEN },
1867 };
1868
1869 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1870 u32 portid, u32 seq, int event,
1871 u32 flags, int family,
1872 const struct nft_table *table,
1873 const struct nft_chain *chain,
1874 const struct nft_rule *rule)
1875 {
1876 struct nlmsghdr *nlh;
1877 struct nfgenmsg *nfmsg;
1878 const struct nft_expr *expr, *next;
1879 struct nlattr *list;
1880 const struct nft_rule *prule;
1881 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1882
1883 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1884 flags);
1885 if (nlh == NULL)
1886 goto nla_put_failure;
1887
1888 nfmsg = nlmsg_data(nlh);
1889 nfmsg->nfgen_family = family;
1890 nfmsg->version = NFNETLINK_V0;
1891 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1892
1893 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1894 goto nla_put_failure;
1895 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1896 goto nla_put_failure;
1897 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1898 NFTA_RULE_PAD))
1899 goto nla_put_failure;
1900
1901 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1902 prule = list_entry(rule->list.prev, struct nft_rule, list);
1903 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1904 cpu_to_be64(prule->handle),
1905 NFTA_RULE_PAD))
1906 goto nla_put_failure;
1907 }
1908
1909 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1910 if (list == NULL)
1911 goto nla_put_failure;
1912 nft_rule_for_each_expr(expr, next, rule) {
1913 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
1914 goto nla_put_failure;
1915 }
1916 nla_nest_end(skb, list);
1917
1918 if (rule->udata) {
1919 struct nft_userdata *udata = nft_userdata(rule);
1920 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1921 udata->data) < 0)
1922 goto nla_put_failure;
1923 }
1924
1925 nlmsg_end(skb, nlh);
1926 return 0;
1927
1928 nla_put_failure:
1929 nlmsg_trim(skb, nlh);
1930 return -1;
1931 }
1932
1933 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1934 const struct nft_rule *rule,
1935 int event)
1936 {
1937 struct sk_buff *skb;
1938 int err;
1939
1940 if (!ctx->report &&
1941 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1942 return 0;
1943
1944 err = -ENOBUFS;
1945 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1946 if (skb == NULL)
1947 goto err;
1948
1949 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1950 event, 0, ctx->afi->family, ctx->table,
1951 ctx->chain, rule);
1952 if (err < 0) {
1953 kfree_skb(skb);
1954 goto err;
1955 }
1956
1957 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1958 ctx->report, GFP_KERNEL);
1959 err:
1960 if (err < 0) {
1961 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1962 err);
1963 }
1964 return err;
1965 }
1966
1967 struct nft_rule_dump_ctx {
1968 char table[NFT_TABLE_MAXNAMELEN];
1969 char chain[NFT_CHAIN_MAXNAMELEN];
1970 };
1971
1972 static int nf_tables_dump_rules(struct sk_buff *skb,
1973 struct netlink_callback *cb)
1974 {
1975 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1976 const struct nft_rule_dump_ctx *ctx = cb->data;
1977 const struct nft_af_info *afi;
1978 const struct nft_table *table;
1979 const struct nft_chain *chain;
1980 const struct nft_rule *rule;
1981 unsigned int idx = 0, s_idx = cb->args[0];
1982 struct net *net = sock_net(skb->sk);
1983 int family = nfmsg->nfgen_family;
1984
1985 rcu_read_lock();
1986 cb->seq = net->nft.base_seq;
1987
1988 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1989 if (family != NFPROTO_UNSPEC && family != afi->family)
1990 continue;
1991
1992 list_for_each_entry_rcu(table, &afi->tables, list) {
1993 if (ctx && ctx->table[0] &&
1994 strcmp(ctx->table, table->name) != 0)
1995 continue;
1996
1997 list_for_each_entry_rcu(chain, &table->chains, list) {
1998 if (ctx && ctx->chain[0] &&
1999 strcmp(ctx->chain, chain->name) != 0)
2000 continue;
2001
2002 list_for_each_entry_rcu(rule, &chain->rules, list) {
2003 if (!nft_is_active(net, rule))
2004 goto cont;
2005 if (idx < s_idx)
2006 goto cont;
2007 if (idx > s_idx)
2008 memset(&cb->args[1], 0,
2009 sizeof(cb->args) - sizeof(cb->args[0]));
2010 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2011 cb->nlh->nlmsg_seq,
2012 NFT_MSG_NEWRULE,
2013 NLM_F_MULTI | NLM_F_APPEND,
2014 afi->family, table, chain, rule) < 0)
2015 goto done;
2016
2017 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2018 cont:
2019 idx++;
2020 }
2021 }
2022 }
2023 }
2024 done:
2025 rcu_read_unlock();
2026
2027 cb->args[0] = idx;
2028 return skb->len;
2029 }
2030
2031 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2032 {
2033 kfree(cb->data);
2034 return 0;
2035 }
2036
2037 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2038 struct sk_buff *skb, const struct nlmsghdr *nlh,
2039 const struct nlattr * const nla[])
2040 {
2041 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2042 u8 genmask = nft_genmask_cur(net);
2043 const struct nft_af_info *afi;
2044 const struct nft_table *table;
2045 const struct nft_chain *chain;
2046 const struct nft_rule *rule;
2047 struct sk_buff *skb2;
2048 int family = nfmsg->nfgen_family;
2049 int err;
2050
2051 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2052 struct netlink_dump_control c = {
2053 .dump = nf_tables_dump_rules,
2054 .done = nf_tables_dump_rules_done,
2055 };
2056
2057 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2058 struct nft_rule_dump_ctx *ctx;
2059
2060 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
2061 if (!ctx)
2062 return -ENOMEM;
2063
2064 if (nla[NFTA_RULE_TABLE])
2065 nla_strlcpy(ctx->table, nla[NFTA_RULE_TABLE],
2066 sizeof(ctx->table));
2067 if (nla[NFTA_RULE_CHAIN])
2068 nla_strlcpy(ctx->chain, nla[NFTA_RULE_CHAIN],
2069 sizeof(ctx->chain));
2070 c.data = ctx;
2071 }
2072
2073 return netlink_dump_start(nlsk, skb, nlh, &c);
2074 }
2075
2076 afi = nf_tables_afinfo_lookup(net, family, false);
2077 if (IS_ERR(afi))
2078 return PTR_ERR(afi);
2079
2080 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2081 if (IS_ERR(table))
2082 return PTR_ERR(table);
2083
2084 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2085 if (IS_ERR(chain))
2086 return PTR_ERR(chain);
2087
2088 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2089 if (IS_ERR(rule))
2090 return PTR_ERR(rule);
2091
2092 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2093 if (!skb2)
2094 return -ENOMEM;
2095
2096 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2097 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2098 family, table, chain, rule);
2099 if (err < 0)
2100 goto err;
2101
2102 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2103
2104 err:
2105 kfree_skb(skb2);
2106 return err;
2107 }
2108
2109 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2110 struct nft_rule *rule)
2111 {
2112 struct nft_expr *expr;
2113
2114 /*
2115 * Careful: some expressions might not be initialized in case this
2116 * is called on error from nf_tables_newrule().
2117 */
2118 expr = nft_expr_first(rule);
2119 while (expr != nft_expr_last(rule) && expr->ops) {
2120 nf_tables_expr_destroy(ctx, expr);
2121 expr = nft_expr_next(expr);
2122 }
2123 kfree(rule);
2124 }
2125
2126 #define NFT_RULE_MAXEXPRS 128
2127
2128 static struct nft_expr_info *info;
2129
2130 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2131 struct sk_buff *skb, const struct nlmsghdr *nlh,
2132 const struct nlattr * const nla[])
2133 {
2134 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2135 u8 genmask = nft_genmask_next(net);
2136 struct nft_af_info *afi;
2137 struct nft_table *table;
2138 struct nft_chain *chain;
2139 struct nft_rule *rule, *old_rule = NULL;
2140 struct nft_userdata *udata;
2141 struct nft_trans *trans = NULL;
2142 struct nft_expr *expr;
2143 struct nft_ctx ctx;
2144 struct nlattr *tmp;
2145 unsigned int size, i, n, ulen = 0, usize = 0;
2146 int err, rem;
2147 bool create;
2148 u64 handle, pos_handle;
2149
2150 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2151
2152 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2153 if (IS_ERR(afi))
2154 return PTR_ERR(afi);
2155
2156 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2157 if (IS_ERR(table))
2158 return PTR_ERR(table);
2159
2160 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2161 if (IS_ERR(chain))
2162 return PTR_ERR(chain);
2163
2164 if (nla[NFTA_RULE_HANDLE]) {
2165 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2166 rule = __nf_tables_rule_lookup(chain, handle);
2167 if (IS_ERR(rule))
2168 return PTR_ERR(rule);
2169
2170 if (nlh->nlmsg_flags & NLM_F_EXCL)
2171 return -EEXIST;
2172 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2173 old_rule = rule;
2174 else
2175 return -EOPNOTSUPP;
2176 } else {
2177 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2178 return -EINVAL;
2179 handle = nf_tables_alloc_handle(table);
2180
2181 if (chain->use == UINT_MAX)
2182 return -EOVERFLOW;
2183 }
2184
2185 if (nla[NFTA_RULE_POSITION]) {
2186 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2187 return -EOPNOTSUPP;
2188
2189 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2190 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2191 if (IS_ERR(old_rule))
2192 return PTR_ERR(old_rule);
2193 }
2194
2195 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2196
2197 n = 0;
2198 size = 0;
2199 if (nla[NFTA_RULE_EXPRESSIONS]) {
2200 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2201 err = -EINVAL;
2202 if (nla_type(tmp) != NFTA_LIST_ELEM)
2203 goto err1;
2204 if (n == NFT_RULE_MAXEXPRS)
2205 goto err1;
2206 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2207 if (err < 0)
2208 goto err1;
2209 size += info[n].ops->size;
2210 n++;
2211 }
2212 }
2213 /* Check for overflow of dlen field */
2214 err = -EFBIG;
2215 if (size >= 1 << 12)
2216 goto err1;
2217
2218 if (nla[NFTA_RULE_USERDATA]) {
2219 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2220 if (ulen > 0)
2221 usize = sizeof(struct nft_userdata) + ulen;
2222 }
2223
2224 err = -ENOMEM;
2225 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2226 if (rule == NULL)
2227 goto err1;
2228
2229 nft_activate_next(net, rule);
2230
2231 rule->handle = handle;
2232 rule->dlen = size;
2233 rule->udata = ulen ? 1 : 0;
2234
2235 if (ulen) {
2236 udata = nft_userdata(rule);
2237 udata->len = ulen - 1;
2238 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2239 }
2240
2241 expr = nft_expr_first(rule);
2242 for (i = 0; i < n; i++) {
2243 err = nf_tables_newexpr(&ctx, &info[i], expr);
2244 if (err < 0)
2245 goto err2;
2246 info[i].ops = NULL;
2247 expr = nft_expr_next(expr);
2248 }
2249
2250 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2251 if (nft_is_active_next(net, old_rule)) {
2252 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2253 old_rule);
2254 if (trans == NULL) {
2255 err = -ENOMEM;
2256 goto err2;
2257 }
2258 nft_deactivate_next(net, old_rule);
2259 chain->use--;
2260 list_add_tail_rcu(&rule->list, &old_rule->list);
2261 } else {
2262 err = -ENOENT;
2263 goto err2;
2264 }
2265 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2266 if (old_rule)
2267 list_add_rcu(&rule->list, &old_rule->list);
2268 else
2269 list_add_tail_rcu(&rule->list, &chain->rules);
2270 else {
2271 if (old_rule)
2272 list_add_tail_rcu(&rule->list, &old_rule->list);
2273 else
2274 list_add_rcu(&rule->list, &chain->rules);
2275 }
2276
2277 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2278 err = -ENOMEM;
2279 goto err3;
2280 }
2281 chain->use++;
2282 return 0;
2283
2284 err3:
2285 list_del_rcu(&rule->list);
2286 err2:
2287 nf_tables_rule_destroy(&ctx, rule);
2288 err1:
2289 for (i = 0; i < n; i++) {
2290 if (info[i].ops != NULL)
2291 module_put(info[i].ops->type->owner);
2292 }
2293 return err;
2294 }
2295
2296 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2297 struct sk_buff *skb, const struct nlmsghdr *nlh,
2298 const struct nlattr * const nla[])
2299 {
2300 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2301 u8 genmask = nft_genmask_next(net);
2302 struct nft_af_info *afi;
2303 struct nft_table *table;
2304 struct nft_chain *chain = NULL;
2305 struct nft_rule *rule;
2306 int family = nfmsg->nfgen_family, err = 0;
2307 struct nft_ctx ctx;
2308
2309 afi = nf_tables_afinfo_lookup(net, family, false);
2310 if (IS_ERR(afi))
2311 return PTR_ERR(afi);
2312
2313 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2314 if (IS_ERR(table))
2315 return PTR_ERR(table);
2316
2317 if (nla[NFTA_RULE_CHAIN]) {
2318 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2319 genmask);
2320 if (IS_ERR(chain))
2321 return PTR_ERR(chain);
2322 }
2323
2324 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2325
2326 if (chain) {
2327 if (nla[NFTA_RULE_HANDLE]) {
2328 rule = nf_tables_rule_lookup(chain,
2329 nla[NFTA_RULE_HANDLE]);
2330 if (IS_ERR(rule))
2331 return PTR_ERR(rule);
2332
2333 err = nft_delrule(&ctx, rule);
2334 } else {
2335 err = nft_delrule_by_chain(&ctx);
2336 }
2337 } else {
2338 list_for_each_entry(chain, &table->chains, list) {
2339 if (!nft_is_active_next(net, chain))
2340 continue;
2341
2342 ctx.chain = chain;
2343 err = nft_delrule_by_chain(&ctx);
2344 if (err < 0)
2345 break;
2346 }
2347 }
2348
2349 return err;
2350 }
2351
2352 /*
2353 * Sets
2354 */
2355
2356 static LIST_HEAD(nf_tables_set_ops);
2357
2358 int nft_register_set(struct nft_set_ops *ops)
2359 {
2360 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2361 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2362 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2363 return 0;
2364 }
2365 EXPORT_SYMBOL_GPL(nft_register_set);
2366
2367 void nft_unregister_set(struct nft_set_ops *ops)
2368 {
2369 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2370 list_del_rcu(&ops->list);
2371 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2372 }
2373 EXPORT_SYMBOL_GPL(nft_unregister_set);
2374
2375 /*
2376 * Select a set implementation based on the data characteristics and the
2377 * given policy. The total memory use might not be known if no size is
2378 * given, in that case the amount of memory per element is used.
2379 */
2380 static const struct nft_set_ops *
2381 nft_select_set_ops(const struct nlattr * const nla[],
2382 const struct nft_set_desc *desc,
2383 enum nft_set_policies policy)
2384 {
2385 const struct nft_set_ops *ops, *bops;
2386 struct nft_set_estimate est, best;
2387 u32 features;
2388
2389 #ifdef CONFIG_MODULES
2390 if (list_empty(&nf_tables_set_ops)) {
2391 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2392 request_module("nft-set");
2393 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2394 if (!list_empty(&nf_tables_set_ops))
2395 return ERR_PTR(-EAGAIN);
2396 }
2397 #endif
2398 features = 0;
2399 if (nla[NFTA_SET_FLAGS] != NULL) {
2400 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2401 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT;
2402 }
2403
2404 bops = NULL;
2405 best.size = ~0;
2406 best.lookup = ~0;
2407 best.space = ~0;
2408
2409 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2410 if ((ops->features & features) != features)
2411 continue;
2412 if (!ops->estimate(desc, features, &est))
2413 continue;
2414
2415 switch (policy) {
2416 case NFT_SET_POL_PERFORMANCE:
2417 if (est.lookup < best.lookup)
2418 break;
2419 if (est.lookup == best.lookup) {
2420 if (!desc->size) {
2421 if (est.space < best.space)
2422 break;
2423 } else if (est.size < best.size) {
2424 break;
2425 }
2426 }
2427 continue;
2428 case NFT_SET_POL_MEMORY:
2429 if (!desc->size) {
2430 if (est.space < best.space)
2431 break;
2432 if (est.space == best.space &&
2433 est.lookup < best.lookup)
2434 break;
2435 } else if (est.size < best.size) {
2436 break;
2437 }
2438 continue;
2439 default:
2440 break;
2441 }
2442
2443 if (!try_module_get(ops->owner))
2444 continue;
2445 if (bops != NULL)
2446 module_put(bops->owner);
2447
2448 bops = ops;
2449 best = est;
2450 }
2451
2452 if (bops != NULL)
2453 return bops;
2454
2455 return ERR_PTR(-EOPNOTSUPP);
2456 }
2457
2458 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2459 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2460 .len = NFT_TABLE_MAXNAMELEN - 1 },
2461 [NFTA_SET_NAME] = { .type = NLA_STRING,
2462 .len = NFT_SET_MAXNAMELEN - 1 },
2463 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2464 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2465 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2466 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2467 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2468 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2469 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2470 [NFTA_SET_ID] = { .type = NLA_U32 },
2471 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2472 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2473 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2474 .len = NFT_USERDATA_MAXLEN },
2475 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
2476 };
2477
2478 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2479 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2480 };
2481
2482 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2483 const struct sk_buff *skb,
2484 const struct nlmsghdr *nlh,
2485 const struct nlattr * const nla[],
2486 u8 genmask)
2487 {
2488 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2489 struct nft_af_info *afi = NULL;
2490 struct nft_table *table = NULL;
2491
2492 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2493 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2494 if (IS_ERR(afi))
2495 return PTR_ERR(afi);
2496 }
2497
2498 if (nla[NFTA_SET_TABLE] != NULL) {
2499 if (afi == NULL)
2500 return -EAFNOSUPPORT;
2501
2502 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2503 genmask);
2504 if (IS_ERR(table))
2505 return PTR_ERR(table);
2506 }
2507
2508 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
2509 return 0;
2510 }
2511
2512 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2513 const struct nlattr *nla, u8 genmask)
2514 {
2515 struct nft_set *set;
2516
2517 if (nla == NULL)
2518 return ERR_PTR(-EINVAL);
2519
2520 list_for_each_entry(set, &table->sets, list) {
2521 if (!nla_strcmp(nla, set->name) &&
2522 nft_active_genmask(set, genmask))
2523 return set;
2524 }
2525 return ERR_PTR(-ENOENT);
2526 }
2527 EXPORT_SYMBOL_GPL(nf_tables_set_lookup);
2528
2529 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2530 const struct nlattr *nla,
2531 u8 genmask)
2532 {
2533 struct nft_trans *trans;
2534 u32 id = ntohl(nla_get_be32(nla));
2535
2536 list_for_each_entry(trans, &net->nft.commit_list, list) {
2537 struct nft_set *set = nft_trans_set(trans);
2538
2539 if (trans->msg_type == NFT_MSG_NEWSET &&
2540 id == nft_trans_set_id(trans) &&
2541 nft_active_genmask(set, genmask))
2542 return set;
2543 }
2544 return ERR_PTR(-ENOENT);
2545 }
2546 EXPORT_SYMBOL_GPL(nf_tables_set_lookup_byid);
2547
2548 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2549 const char *name)
2550 {
2551 const struct nft_set *i;
2552 const char *p;
2553 unsigned long *inuse;
2554 unsigned int n = 0, min = 0;
2555
2556 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
2557 if (p != NULL) {
2558 if (p[1] != 'd' || strchr(p + 2, '%'))
2559 return -EINVAL;
2560
2561 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2562 if (inuse == NULL)
2563 return -ENOMEM;
2564 cont:
2565 list_for_each_entry(i, &ctx->table->sets, list) {
2566 int tmp;
2567
2568 if (!nft_is_active_next(ctx->net, set))
2569 continue;
2570 if (!sscanf(i->name, name, &tmp))
2571 continue;
2572 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2573 continue;
2574
2575 set_bit(tmp - min, inuse);
2576 }
2577
2578 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2579 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2580 min += BITS_PER_BYTE * PAGE_SIZE;
2581 memset(inuse, 0, PAGE_SIZE);
2582 goto cont;
2583 }
2584 free_page((unsigned long)inuse);
2585 }
2586
2587 snprintf(set->name, sizeof(set->name), name, min + n);
2588 list_for_each_entry(i, &ctx->table->sets, list) {
2589 if (!nft_is_active_next(ctx->net, i))
2590 continue;
2591 if (!strcmp(set->name, i->name))
2592 return -ENFILE;
2593 }
2594 return 0;
2595 }
2596
2597 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2598 const struct nft_set *set, u16 event, u16 flags)
2599 {
2600 struct nfgenmsg *nfmsg;
2601 struct nlmsghdr *nlh;
2602 struct nlattr *desc;
2603 u32 portid = ctx->portid;
2604 u32 seq = ctx->seq;
2605
2606 event |= NFNL_SUBSYS_NFTABLES << 8;
2607 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2608 flags);
2609 if (nlh == NULL)
2610 goto nla_put_failure;
2611
2612 nfmsg = nlmsg_data(nlh);
2613 nfmsg->nfgen_family = ctx->afi->family;
2614 nfmsg->version = NFNETLINK_V0;
2615 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2616
2617 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2618 goto nla_put_failure;
2619 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2620 goto nla_put_failure;
2621 if (set->flags != 0)
2622 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2623 goto nla_put_failure;
2624
2625 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2626 goto nla_put_failure;
2627 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2628 goto nla_put_failure;
2629 if (set->flags & NFT_SET_MAP) {
2630 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2631 goto nla_put_failure;
2632 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2633 goto nla_put_failure;
2634 }
2635 if (set->flags & NFT_SET_OBJECT &&
2636 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
2637 goto nla_put_failure;
2638
2639 if (set->timeout &&
2640 nla_put_be64(skb, NFTA_SET_TIMEOUT,
2641 cpu_to_be64(jiffies_to_msecs(set->timeout)),
2642 NFTA_SET_PAD))
2643 goto nla_put_failure;
2644 if (set->gc_int &&
2645 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2646 goto nla_put_failure;
2647
2648 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2649 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2650 goto nla_put_failure;
2651 }
2652
2653 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2654 goto nla_put_failure;
2655
2656 desc = nla_nest_start(skb, NFTA_SET_DESC);
2657 if (desc == NULL)
2658 goto nla_put_failure;
2659 if (set->size &&
2660 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2661 goto nla_put_failure;
2662 nla_nest_end(skb, desc);
2663
2664 nlmsg_end(skb, nlh);
2665 return 0;
2666
2667 nla_put_failure:
2668 nlmsg_trim(skb, nlh);
2669 return -1;
2670 }
2671
2672 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2673 const struct nft_set *set,
2674 int event, gfp_t gfp_flags)
2675 {
2676 struct sk_buff *skb;
2677 u32 portid = ctx->portid;
2678 int err;
2679
2680 if (!ctx->report &&
2681 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2682 return 0;
2683
2684 err = -ENOBUFS;
2685 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2686 if (skb == NULL)
2687 goto err;
2688
2689 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2690 if (err < 0) {
2691 kfree_skb(skb);
2692 goto err;
2693 }
2694
2695 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2696 ctx->report, gfp_flags);
2697 err:
2698 if (err < 0)
2699 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2700 return err;
2701 }
2702
2703 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2704 {
2705 const struct nft_set *set;
2706 unsigned int idx, s_idx = cb->args[0];
2707 struct nft_af_info *afi;
2708 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2709 struct net *net = sock_net(skb->sk);
2710 int cur_family = cb->args[3];
2711 struct nft_ctx *ctx = cb->data, ctx_set;
2712
2713 if (cb->args[1])
2714 return skb->len;
2715
2716 rcu_read_lock();
2717 cb->seq = net->nft.base_seq;
2718
2719 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2720 if (ctx->afi && ctx->afi != afi)
2721 continue;
2722
2723 if (cur_family) {
2724 if (afi->family != cur_family)
2725 continue;
2726
2727 cur_family = 0;
2728 }
2729 list_for_each_entry_rcu(table, &afi->tables, list) {
2730 if (ctx->table && ctx->table != table)
2731 continue;
2732
2733 if (cur_table) {
2734 if (cur_table != table)
2735 continue;
2736
2737 cur_table = NULL;
2738 }
2739 idx = 0;
2740 list_for_each_entry_rcu(set, &table->sets, list) {
2741 if (idx < s_idx)
2742 goto cont;
2743 if (!nft_is_active(net, set))
2744 goto cont;
2745
2746 ctx_set = *ctx;
2747 ctx_set.table = table;
2748 ctx_set.afi = afi;
2749 if (nf_tables_fill_set(skb, &ctx_set, set,
2750 NFT_MSG_NEWSET,
2751 NLM_F_MULTI) < 0) {
2752 cb->args[0] = idx;
2753 cb->args[2] = (unsigned long) table;
2754 cb->args[3] = afi->family;
2755 goto done;
2756 }
2757 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2758 cont:
2759 idx++;
2760 }
2761 if (s_idx)
2762 s_idx = 0;
2763 }
2764 }
2765 cb->args[1] = 1;
2766 done:
2767 rcu_read_unlock();
2768 return skb->len;
2769 }
2770
2771 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2772 {
2773 kfree(cb->data);
2774 return 0;
2775 }
2776
2777 static int nf_tables_getset(struct net *net, struct sock *nlsk,
2778 struct sk_buff *skb, const struct nlmsghdr *nlh,
2779 const struct nlattr * const nla[])
2780 {
2781 u8 genmask = nft_genmask_cur(net);
2782 const struct nft_set *set;
2783 struct nft_ctx ctx;
2784 struct sk_buff *skb2;
2785 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2786 int err;
2787
2788 /* Verify existence before starting dump */
2789 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
2790 if (err < 0)
2791 return err;
2792
2793 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2794 struct netlink_dump_control c = {
2795 .dump = nf_tables_dump_sets,
2796 .done = nf_tables_dump_sets_done,
2797 };
2798 struct nft_ctx *ctx_dump;
2799
2800 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2801 if (ctx_dump == NULL)
2802 return -ENOMEM;
2803
2804 *ctx_dump = ctx;
2805 c.data = ctx_dump;
2806
2807 return netlink_dump_start(nlsk, skb, nlh, &c);
2808 }
2809
2810 /* Only accept unspec with dump */
2811 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2812 return -EAFNOSUPPORT;
2813 if (!nla[NFTA_SET_TABLE])
2814 return -EINVAL;
2815
2816 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
2817 if (IS_ERR(set))
2818 return PTR_ERR(set);
2819
2820 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2821 if (skb2 == NULL)
2822 return -ENOMEM;
2823
2824 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2825 if (err < 0)
2826 goto err;
2827
2828 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2829
2830 err:
2831 kfree_skb(skb2);
2832 return err;
2833 }
2834
2835 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2836 struct nft_set_desc *desc,
2837 const struct nlattr *nla)
2838 {
2839 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2840 int err;
2841
2842 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2843 if (err < 0)
2844 return err;
2845
2846 if (da[NFTA_SET_DESC_SIZE] != NULL)
2847 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2848
2849 return 0;
2850 }
2851
2852 static int nf_tables_newset(struct net *net, struct sock *nlsk,
2853 struct sk_buff *skb, const struct nlmsghdr *nlh,
2854 const struct nlattr * const nla[])
2855 {
2856 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2857 u8 genmask = nft_genmask_next(net);
2858 const struct nft_set_ops *ops;
2859 struct nft_af_info *afi;
2860 struct nft_table *table;
2861 struct nft_set *set;
2862 struct nft_ctx ctx;
2863 char name[NFT_SET_MAXNAMELEN];
2864 unsigned int size;
2865 bool create;
2866 u64 timeout;
2867 u32 ktype, dtype, flags, policy, gc_int, objtype;
2868 struct nft_set_desc desc;
2869 unsigned char *udata;
2870 u16 udlen;
2871 int err;
2872
2873 if (nla[NFTA_SET_TABLE] == NULL ||
2874 nla[NFTA_SET_NAME] == NULL ||
2875 nla[NFTA_SET_KEY_LEN] == NULL ||
2876 nla[NFTA_SET_ID] == NULL)
2877 return -EINVAL;
2878
2879 memset(&desc, 0, sizeof(desc));
2880
2881 ktype = NFT_DATA_VALUE;
2882 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2883 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2884 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2885 return -EINVAL;
2886 }
2887
2888 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2889 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
2890 return -EINVAL;
2891
2892 flags = 0;
2893 if (nla[NFTA_SET_FLAGS] != NULL) {
2894 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2895 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2896 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2897 NFT_SET_MAP | NFT_SET_EVAL |
2898 NFT_SET_OBJECT))
2899 return -EINVAL;
2900 /* Only one of these operations is supported */
2901 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
2902 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
2903 return -EOPNOTSUPP;
2904 }
2905
2906 dtype = 0;
2907 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2908 if (!(flags & NFT_SET_MAP))
2909 return -EINVAL;
2910
2911 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2912 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2913 dtype != NFT_DATA_VERDICT)
2914 return -EINVAL;
2915
2916 if (dtype != NFT_DATA_VERDICT) {
2917 if (nla[NFTA_SET_DATA_LEN] == NULL)
2918 return -EINVAL;
2919 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2920 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
2921 return -EINVAL;
2922 } else
2923 desc.dlen = sizeof(struct nft_verdict);
2924 } else if (flags & NFT_SET_MAP)
2925 return -EINVAL;
2926
2927 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
2928 if (!(flags & NFT_SET_OBJECT))
2929 return -EINVAL;
2930
2931 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
2932 if (objtype == NFT_OBJECT_UNSPEC ||
2933 objtype > NFT_OBJECT_MAX)
2934 return -EINVAL;
2935 } else if (flags & NFT_SET_OBJECT)
2936 return -EINVAL;
2937 else
2938 objtype = NFT_OBJECT_UNSPEC;
2939
2940 timeout = 0;
2941 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2942 if (!(flags & NFT_SET_TIMEOUT))
2943 return -EINVAL;
2944 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
2945 nla[NFTA_SET_TIMEOUT])));
2946 }
2947 gc_int = 0;
2948 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2949 if (!(flags & NFT_SET_TIMEOUT))
2950 return -EINVAL;
2951 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2952 }
2953
2954 policy = NFT_SET_POL_PERFORMANCE;
2955 if (nla[NFTA_SET_POLICY] != NULL)
2956 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2957
2958 if (nla[NFTA_SET_DESC] != NULL) {
2959 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2960 if (err < 0)
2961 return err;
2962 }
2963
2964 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2965
2966 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2967 if (IS_ERR(afi))
2968 return PTR_ERR(afi);
2969
2970 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
2971 if (IS_ERR(table))
2972 return PTR_ERR(table);
2973
2974 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
2975
2976 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
2977 if (IS_ERR(set)) {
2978 if (PTR_ERR(set) != -ENOENT)
2979 return PTR_ERR(set);
2980 } else {
2981 if (nlh->nlmsg_flags & NLM_F_EXCL)
2982 return -EEXIST;
2983 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2984 return -EOPNOTSUPP;
2985 return 0;
2986 }
2987
2988 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2989 return -ENOENT;
2990
2991 ops = nft_select_set_ops(nla, &desc, policy);
2992 if (IS_ERR(ops))
2993 return PTR_ERR(ops);
2994
2995 udlen = 0;
2996 if (nla[NFTA_SET_USERDATA])
2997 udlen = nla_len(nla[NFTA_SET_USERDATA]);
2998
2999 size = 0;
3000 if (ops->privsize != NULL)
3001 size = ops->privsize(nla);
3002
3003 err = -ENOMEM;
3004 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3005 if (set == NULL)
3006 goto err1;
3007
3008 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
3009 err = nf_tables_set_alloc_name(&ctx, set, name);
3010 if (err < 0)
3011 goto err2;
3012
3013 udata = NULL;
3014 if (udlen) {
3015 udata = set->data + size;
3016 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3017 }
3018
3019 INIT_LIST_HEAD(&set->bindings);
3020 set->ops = ops;
3021 set->ktype = ktype;
3022 set->klen = desc.klen;
3023 set->dtype = dtype;
3024 set->objtype = objtype;
3025 set->dlen = desc.dlen;
3026 set->flags = flags;
3027 set->size = desc.size;
3028 set->policy = policy;
3029 set->udlen = udlen;
3030 set->udata = udata;
3031 set->timeout = timeout;
3032 set->gc_int = gc_int;
3033
3034 err = ops->init(set, &desc, nla);
3035 if (err < 0)
3036 goto err2;
3037
3038 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3039 if (err < 0)
3040 goto err3;
3041
3042 list_add_tail_rcu(&set->list, &table->sets);
3043 table->use++;
3044 return 0;
3045
3046 err3:
3047 ops->destroy(set);
3048 err2:
3049 kfree(set);
3050 err1:
3051 module_put(ops->owner);
3052 return err;
3053 }
3054
3055 static void nft_set_destroy(struct nft_set *set)
3056 {
3057 set->ops->destroy(set);
3058 module_put(set->ops->owner);
3059 kfree(set);
3060 }
3061
3062 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3063 {
3064 list_del_rcu(&set->list);
3065 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
3066 nft_set_destroy(set);
3067 }
3068
3069 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3070 struct sk_buff *skb, const struct nlmsghdr *nlh,
3071 const struct nlattr * const nla[])
3072 {
3073 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3074 u8 genmask = nft_genmask_next(net);
3075 struct nft_set *set;
3076 struct nft_ctx ctx;
3077 int err;
3078
3079 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3080 return -EAFNOSUPPORT;
3081 if (nla[NFTA_SET_TABLE] == NULL)
3082 return -EINVAL;
3083
3084 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
3085 if (err < 0)
3086 return err;
3087
3088 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3089 if (IS_ERR(set))
3090 return PTR_ERR(set);
3091 if (!list_empty(&set->bindings))
3092 return -EBUSY;
3093
3094 return nft_delset(&ctx, set);
3095 }
3096
3097 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3098 struct nft_set *set,
3099 const struct nft_set_iter *iter,
3100 struct nft_set_elem *elem)
3101 {
3102 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3103 enum nft_registers dreg;
3104
3105 dreg = nft_type_to_reg(set->dtype);
3106 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3107 set->dtype == NFT_DATA_VERDICT ?
3108 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3109 set->dlen);
3110 }
3111
3112 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3113 struct nft_set_binding *binding)
3114 {
3115 struct nft_set_binding *i;
3116 struct nft_set_iter iter;
3117
3118 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
3119 return -EBUSY;
3120
3121 if (binding->flags & NFT_SET_MAP) {
3122 /* If the set is already bound to the same chain all
3123 * jumps are already validated for that chain.
3124 */
3125 list_for_each_entry(i, &set->bindings, list) {
3126 if (i->flags & NFT_SET_MAP &&
3127 i->chain == binding->chain)
3128 goto bind;
3129 }
3130
3131 iter.genmask = nft_genmask_next(ctx->net);
3132 iter.skip = 0;
3133 iter.count = 0;
3134 iter.err = 0;
3135 iter.fn = nf_tables_bind_check_setelem;
3136 iter.flush = false;
3137
3138 set->ops->walk(ctx, set, &iter);
3139 if (iter.err < 0)
3140 return iter.err;
3141 }
3142 bind:
3143 binding->chain = ctx->chain;
3144 list_add_tail_rcu(&binding->list, &set->bindings);
3145 return 0;
3146 }
3147 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3148
3149 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3150 struct nft_set_binding *binding)
3151 {
3152 list_del_rcu(&binding->list);
3153
3154 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
3155 nft_is_active(ctx->net, set))
3156 nf_tables_set_destroy(ctx, set);
3157 }
3158 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3159
3160 const struct nft_set_ext_type nft_set_ext_types[] = {
3161 [NFT_SET_EXT_KEY] = {
3162 .align = __alignof__(u32),
3163 },
3164 [NFT_SET_EXT_DATA] = {
3165 .align = __alignof__(u32),
3166 },
3167 [NFT_SET_EXT_EXPR] = {
3168 .align = __alignof__(struct nft_expr),
3169 },
3170 [NFT_SET_EXT_OBJREF] = {
3171 .len = sizeof(struct nft_object *),
3172 .align = __alignof__(struct nft_object *),
3173 },
3174 [NFT_SET_EXT_FLAGS] = {
3175 .len = sizeof(u8),
3176 .align = __alignof__(u8),
3177 },
3178 [NFT_SET_EXT_TIMEOUT] = {
3179 .len = sizeof(u64),
3180 .align = __alignof__(u64),
3181 },
3182 [NFT_SET_EXT_EXPIRATION] = {
3183 .len = sizeof(unsigned long),
3184 .align = __alignof__(unsigned long),
3185 },
3186 [NFT_SET_EXT_USERDATA] = {
3187 .len = sizeof(struct nft_userdata),
3188 .align = __alignof__(struct nft_userdata),
3189 },
3190 };
3191 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3192
3193 /*
3194 * Set elements
3195 */
3196
3197 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3198 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3199 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3200 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3201 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3202 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3203 .len = NFT_USERDATA_MAXLEN },
3204 };
3205
3206 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3207 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3208 .len = NFT_TABLE_MAXNAMELEN - 1 },
3209 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3210 .len = NFT_SET_MAXNAMELEN - 1 },
3211 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3212 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3213 };
3214
3215 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3216 const struct sk_buff *skb,
3217 const struct nlmsghdr *nlh,
3218 const struct nlattr * const nla[],
3219 u8 genmask)
3220 {
3221 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3222 struct nft_af_info *afi;
3223 struct nft_table *table;
3224
3225 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3226 if (IS_ERR(afi))
3227 return PTR_ERR(afi);
3228
3229 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3230 genmask);
3231 if (IS_ERR(table))
3232 return PTR_ERR(table);
3233
3234 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
3235 return 0;
3236 }
3237
3238 static int nf_tables_fill_setelem(struct sk_buff *skb,
3239 const struct nft_set *set,
3240 const struct nft_set_elem *elem)
3241 {
3242 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3243 unsigned char *b = skb_tail_pointer(skb);
3244 struct nlattr *nest;
3245
3246 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3247 if (nest == NULL)
3248 goto nla_put_failure;
3249
3250 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3251 NFT_DATA_VALUE, set->klen) < 0)
3252 goto nla_put_failure;
3253
3254 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3255 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3256 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3257 set->dlen) < 0)
3258 goto nla_put_failure;
3259
3260 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3261 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3262 goto nla_put_failure;
3263
3264 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3265 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3266 (*nft_set_ext_obj(ext))->name) < 0)
3267 goto nla_put_failure;
3268
3269 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3270 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3271 htonl(*nft_set_ext_flags(ext))))
3272 goto nla_put_failure;
3273
3274 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3275 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3276 cpu_to_be64(jiffies_to_msecs(
3277 *nft_set_ext_timeout(ext))),
3278 NFTA_SET_ELEM_PAD))
3279 goto nla_put_failure;
3280
3281 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3282 unsigned long expires, now = jiffies;
3283
3284 expires = *nft_set_ext_expiration(ext);
3285 if (time_before(now, expires))
3286 expires -= now;
3287 else
3288 expires = 0;
3289
3290 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3291 cpu_to_be64(jiffies_to_msecs(expires)),
3292 NFTA_SET_ELEM_PAD))
3293 goto nla_put_failure;
3294 }
3295
3296 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3297 struct nft_userdata *udata;
3298
3299 udata = nft_set_ext_userdata(ext);
3300 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3301 udata->len + 1, udata->data))
3302 goto nla_put_failure;
3303 }
3304
3305 nla_nest_end(skb, nest);
3306 return 0;
3307
3308 nla_put_failure:
3309 nlmsg_trim(skb, b);
3310 return -EMSGSIZE;
3311 }
3312
3313 struct nft_set_dump_args {
3314 const struct netlink_callback *cb;
3315 struct nft_set_iter iter;
3316 struct sk_buff *skb;
3317 };
3318
3319 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3320 struct nft_set *set,
3321 const struct nft_set_iter *iter,
3322 struct nft_set_elem *elem)
3323 {
3324 struct nft_set_dump_args *args;
3325
3326 args = container_of(iter, struct nft_set_dump_args, iter);
3327 return nf_tables_fill_setelem(args->skb, set, elem);
3328 }
3329
3330 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3331 {
3332 struct net *net = sock_net(skb->sk);
3333 u8 genmask = nft_genmask_cur(net);
3334 struct nft_set *set;
3335 struct nft_set_dump_args args;
3336 struct nft_ctx ctx;
3337 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3338 struct nfgenmsg *nfmsg;
3339 struct nlmsghdr *nlh;
3340 struct nlattr *nest;
3341 u32 portid, seq;
3342 int event, err;
3343
3344 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3345 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
3346 if (err < 0)
3347 return err;
3348
3349 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
3350 (void *)nla, genmask);
3351 if (err < 0)
3352 return err;
3353
3354 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3355 genmask);
3356 if (IS_ERR(set))
3357 return PTR_ERR(set);
3358
3359 event = NFT_MSG_NEWSETELEM;
3360 event |= NFNL_SUBSYS_NFTABLES << 8;
3361 portid = NETLINK_CB(cb->skb).portid;
3362 seq = cb->nlh->nlmsg_seq;
3363
3364 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3365 NLM_F_MULTI);
3366 if (nlh == NULL)
3367 goto nla_put_failure;
3368
3369 nfmsg = nlmsg_data(nlh);
3370 nfmsg->nfgen_family = ctx.afi->family;
3371 nfmsg->version = NFNETLINK_V0;
3372 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
3373
3374 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3375 goto nla_put_failure;
3376 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3377 goto nla_put_failure;
3378
3379 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3380 if (nest == NULL)
3381 goto nla_put_failure;
3382
3383 args.cb = cb;
3384 args.skb = skb;
3385 args.iter.genmask = nft_genmask_cur(ctx.net);
3386 args.iter.skip = cb->args[0];
3387 args.iter.count = 0;
3388 args.iter.err = 0;
3389 args.iter.fn = nf_tables_dump_setelem;
3390 args.iter.flush = false;
3391 set->ops->walk(&ctx, set, &args.iter);
3392
3393 nla_nest_end(skb, nest);
3394 nlmsg_end(skb, nlh);
3395
3396 if (args.iter.err && args.iter.err != -EMSGSIZE)
3397 return args.iter.err;
3398 if (args.iter.count == cb->args[0])
3399 return 0;
3400
3401 cb->args[0] = args.iter.count;
3402 return skb->len;
3403
3404 nla_put_failure:
3405 return -ENOSPC;
3406 }
3407
3408 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3409 struct sk_buff *skb, const struct nlmsghdr *nlh,
3410 const struct nlattr * const nla[])
3411 {
3412 u8 genmask = nft_genmask_cur(net);
3413 const struct nft_set *set;
3414 struct nft_ctx ctx;
3415 int err;
3416
3417 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3418 if (err < 0)
3419 return err;
3420
3421 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3422 genmask);
3423 if (IS_ERR(set))
3424 return PTR_ERR(set);
3425
3426 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3427 struct netlink_dump_control c = {
3428 .dump = nf_tables_dump_set,
3429 };
3430 return netlink_dump_start(nlsk, skb, nlh, &c);
3431 }
3432 return -EOPNOTSUPP;
3433 }
3434
3435 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3436 const struct nft_ctx *ctx, u32 seq,
3437 u32 portid, int event, u16 flags,
3438 const struct nft_set *set,
3439 const struct nft_set_elem *elem)
3440 {
3441 struct nfgenmsg *nfmsg;
3442 struct nlmsghdr *nlh;
3443 struct nlattr *nest;
3444 int err;
3445
3446 event |= NFNL_SUBSYS_NFTABLES << 8;
3447 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3448 flags);
3449 if (nlh == NULL)
3450 goto nla_put_failure;
3451
3452 nfmsg = nlmsg_data(nlh);
3453 nfmsg->nfgen_family = ctx->afi->family;
3454 nfmsg->version = NFNETLINK_V0;
3455 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3456
3457 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3458 goto nla_put_failure;
3459 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3460 goto nla_put_failure;
3461
3462 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3463 if (nest == NULL)
3464 goto nla_put_failure;
3465
3466 err = nf_tables_fill_setelem(skb, set, elem);
3467 if (err < 0)
3468 goto nla_put_failure;
3469
3470 nla_nest_end(skb, nest);
3471
3472 nlmsg_end(skb, nlh);
3473 return 0;
3474
3475 nla_put_failure:
3476 nlmsg_trim(skb, nlh);
3477 return -1;
3478 }
3479
3480 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3481 const struct nft_set *set,
3482 const struct nft_set_elem *elem,
3483 int event, u16 flags)
3484 {
3485 struct net *net = ctx->net;
3486 u32 portid = ctx->portid;
3487 struct sk_buff *skb;
3488 int err;
3489
3490 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3491 return 0;
3492
3493 err = -ENOBUFS;
3494 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3495 if (skb == NULL)
3496 goto err;
3497
3498 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3499 set, elem);
3500 if (err < 0) {
3501 kfree_skb(skb);
3502 goto err;
3503 }
3504
3505 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3506 GFP_KERNEL);
3507 err:
3508 if (err < 0)
3509 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3510 return err;
3511 }
3512
3513 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3514 int msg_type,
3515 struct nft_set *set)
3516 {
3517 struct nft_trans *trans;
3518
3519 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3520 if (trans == NULL)
3521 return NULL;
3522
3523 nft_trans_elem_set(trans) = set;
3524 return trans;
3525 }
3526
3527 void *nft_set_elem_init(const struct nft_set *set,
3528 const struct nft_set_ext_tmpl *tmpl,
3529 const u32 *key, const u32 *data,
3530 u64 timeout, gfp_t gfp)
3531 {
3532 struct nft_set_ext *ext;
3533 void *elem;
3534
3535 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3536 if (elem == NULL)
3537 return NULL;
3538
3539 ext = nft_set_elem_ext(set, elem);
3540 nft_set_ext_init(ext, tmpl);
3541
3542 memcpy(nft_set_ext_key(ext), key, set->klen);
3543 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3544 memcpy(nft_set_ext_data(ext), data, set->dlen);
3545 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3546 *nft_set_ext_expiration(ext) =
3547 jiffies + timeout;
3548 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3549 *nft_set_ext_timeout(ext) = timeout;
3550
3551 return elem;
3552 }
3553
3554 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
3555 bool destroy_expr)
3556 {
3557 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3558
3559 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3560 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3561 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
3562 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3563 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3564 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
3565 (*nft_set_ext_obj(ext))->use--;
3566 kfree(elem);
3567 }
3568 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3569
3570 static int nft_setelem_parse_flags(const struct nft_set *set,
3571 const struct nlattr *attr, u32 *flags)
3572 {
3573 if (attr == NULL)
3574 return 0;
3575
3576 *flags = ntohl(nla_get_be32(attr));
3577 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3578 return -EINVAL;
3579 if (!(set->flags & NFT_SET_INTERVAL) &&
3580 *flags & NFT_SET_ELEM_INTERVAL_END)
3581 return -EINVAL;
3582
3583 return 0;
3584 }
3585
3586 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3587 const struct nlattr *attr, u32 nlmsg_flags)
3588 {
3589 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3590 u8 genmask = nft_genmask_next(ctx->net);
3591 struct nft_data_desc d1, d2;
3592 struct nft_set_ext_tmpl tmpl;
3593 struct nft_set_ext *ext, *ext2;
3594 struct nft_set_elem elem;
3595 struct nft_set_binding *binding;
3596 struct nft_object *obj = NULL;
3597 struct nft_userdata *udata;
3598 struct nft_data data;
3599 enum nft_registers dreg;
3600 struct nft_trans *trans;
3601 u32 flags = 0;
3602 u64 timeout;
3603 u8 ulen;
3604 int err;
3605
3606 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3607 nft_set_elem_policy);
3608 if (err < 0)
3609 return err;
3610
3611 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3612 return -EINVAL;
3613
3614 nft_set_ext_prepare(&tmpl);
3615
3616 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3617 if (err < 0)
3618 return err;
3619 if (flags != 0)
3620 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3621
3622 if (set->flags & NFT_SET_MAP) {
3623 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3624 !(flags & NFT_SET_ELEM_INTERVAL_END))
3625 return -EINVAL;
3626 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3627 flags & NFT_SET_ELEM_INTERVAL_END)
3628 return -EINVAL;
3629 } else {
3630 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3631 return -EINVAL;
3632 }
3633
3634 timeout = 0;
3635 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3636 if (!(set->flags & NFT_SET_TIMEOUT))
3637 return -EINVAL;
3638 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3639 nla[NFTA_SET_ELEM_TIMEOUT])));
3640 } else if (set->flags & NFT_SET_TIMEOUT) {
3641 timeout = set->timeout;
3642 }
3643
3644 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3645 nla[NFTA_SET_ELEM_KEY]);
3646 if (err < 0)
3647 goto err1;
3648 err = -EINVAL;
3649 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3650 goto err2;
3651
3652 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3653 if (timeout > 0) {
3654 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3655 if (timeout != set->timeout)
3656 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3657 }
3658
3659 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
3660 if (!(set->flags & NFT_SET_OBJECT)) {
3661 err = -EINVAL;
3662 goto err2;
3663 }
3664 obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
3665 set->objtype, genmask);
3666 if (IS_ERR(obj)) {
3667 err = PTR_ERR(obj);
3668 goto err2;
3669 }
3670 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
3671 }
3672
3673 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3674 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3675 nla[NFTA_SET_ELEM_DATA]);
3676 if (err < 0)
3677 goto err2;
3678
3679 err = -EINVAL;
3680 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3681 goto err3;
3682
3683 dreg = nft_type_to_reg(set->dtype);
3684 list_for_each_entry(binding, &set->bindings, list) {
3685 struct nft_ctx bind_ctx = {
3686 .net = ctx->net,
3687 .afi = ctx->afi,
3688 .table = ctx->table,
3689 .chain = (struct nft_chain *)binding->chain,
3690 };
3691
3692 if (!(binding->flags & NFT_SET_MAP))
3693 continue;
3694
3695 err = nft_validate_register_store(&bind_ctx, dreg,
3696 &data,
3697 d2.type, d2.len);
3698 if (err < 0)
3699 goto err3;
3700 }
3701
3702 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
3703 }
3704
3705 /* The full maximum length of userdata can exceed the maximum
3706 * offset value (U8_MAX) for following extensions, therefor it
3707 * must be the last extension added.
3708 */
3709 ulen = 0;
3710 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3711 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3712 if (ulen > 0)
3713 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3714 ulen);
3715 }
3716
3717 err = -ENOMEM;
3718 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
3719 timeout, GFP_KERNEL);
3720 if (elem.priv == NULL)
3721 goto err3;
3722
3723 ext = nft_set_elem_ext(set, elem.priv);
3724 if (flags)
3725 *nft_set_ext_flags(ext) = flags;
3726 if (ulen > 0) {
3727 udata = nft_set_ext_userdata(ext);
3728 udata->len = ulen - 1;
3729 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3730 }
3731 if (obj) {
3732 *nft_set_ext_obj(ext) = obj;
3733 obj->use++;
3734 }
3735
3736 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3737 if (trans == NULL)
3738 goto err4;
3739
3740 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
3741 err = set->ops->insert(ctx->net, set, &elem, &ext2);
3742 if (err) {
3743 if (err == -EEXIST) {
3744 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3745 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
3746 memcmp(nft_set_ext_data(ext),
3747 nft_set_ext_data(ext2), set->dlen) != 0) ||
3748 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3749 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
3750 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
3751 err = -EBUSY;
3752 else if (!(nlmsg_flags & NLM_F_EXCL))
3753 err = 0;
3754 }
3755 goto err5;
3756 }
3757
3758 if (set->size &&
3759 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
3760 err = -ENFILE;
3761 goto err6;
3762 }
3763
3764 nft_trans_elem(trans) = elem;
3765 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3766 return 0;
3767
3768 err6:
3769 set->ops->remove(ctx->net, set, &elem);
3770 err5:
3771 kfree(trans);
3772 err4:
3773 kfree(elem.priv);
3774 err3:
3775 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3776 nft_data_uninit(&data, d2.type);
3777 err2:
3778 nft_data_uninit(&elem.key.val, d1.type);
3779 err1:
3780 return err;
3781 }
3782
3783 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3784 struct sk_buff *skb, const struct nlmsghdr *nlh,
3785 const struct nlattr * const nla[])
3786 {
3787 u8 genmask = nft_genmask_next(net);
3788 const struct nlattr *attr;
3789 struct nft_set *set;
3790 struct nft_ctx ctx;
3791 int rem, err = 0;
3792
3793 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3794 return -EINVAL;
3795
3796 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3797 if (err < 0)
3798 return err;
3799
3800 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3801 genmask);
3802 if (IS_ERR(set)) {
3803 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3804 set = nf_tables_set_lookup_byid(net,
3805 nla[NFTA_SET_ELEM_LIST_SET_ID],
3806 genmask);
3807 }
3808 if (IS_ERR(set))
3809 return PTR_ERR(set);
3810 }
3811
3812 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3813 return -EBUSY;
3814
3815 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3816 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
3817 if (err < 0)
3818 break;
3819 }
3820 return err;
3821 }
3822
3823 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3824 const struct nlattr *attr)
3825 {
3826 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3827 struct nft_set_ext_tmpl tmpl;
3828 struct nft_data_desc desc;
3829 struct nft_set_elem elem;
3830 struct nft_set_ext *ext;
3831 struct nft_trans *trans;
3832 u32 flags = 0;
3833 void *priv;
3834 int err;
3835
3836 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3837 nft_set_elem_policy);
3838 if (err < 0)
3839 goto err1;
3840
3841 err = -EINVAL;
3842 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3843 goto err1;
3844
3845 nft_set_ext_prepare(&tmpl);
3846
3847 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3848 if (err < 0)
3849 return err;
3850 if (flags != 0)
3851 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3852
3853 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3854 nla[NFTA_SET_ELEM_KEY]);
3855 if (err < 0)
3856 goto err1;
3857
3858 err = -EINVAL;
3859 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3860 goto err2;
3861
3862 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3863
3864 err = -ENOMEM;
3865 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3866 GFP_KERNEL);
3867 if (elem.priv == NULL)
3868 goto err2;
3869
3870 ext = nft_set_elem_ext(set, elem.priv);
3871 if (flags)
3872 *nft_set_ext_flags(ext) = flags;
3873
3874 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3875 if (trans == NULL) {
3876 err = -ENOMEM;
3877 goto err3;
3878 }
3879
3880 priv = set->ops->deactivate(ctx->net, set, &elem);
3881 if (priv == NULL) {
3882 err = -ENOENT;
3883 goto err4;
3884 }
3885 kfree(elem.priv);
3886 elem.priv = priv;
3887
3888 nft_trans_elem(trans) = elem;
3889 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3890 return 0;
3891
3892 err4:
3893 kfree(trans);
3894 err3:
3895 kfree(elem.priv);
3896 err2:
3897 nft_data_uninit(&elem.key.val, desc.type);
3898 err1:
3899 return err;
3900 }
3901
3902 static int nft_flush_set(const struct nft_ctx *ctx,
3903 struct nft_set *set,
3904 const struct nft_set_iter *iter,
3905 struct nft_set_elem *elem)
3906 {
3907 struct nft_trans *trans;
3908 int err;
3909
3910 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
3911 sizeof(struct nft_trans_elem), GFP_ATOMIC);
3912 if (!trans)
3913 return -ENOMEM;
3914
3915 if (!set->ops->flush(ctx->net, set, elem->priv)) {
3916 err = -ENOENT;
3917 goto err1;
3918 }
3919 set->ndeact++;
3920
3921 nft_trans_elem_set(trans) = set;
3922 nft_trans_elem(trans) = *elem;
3923 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3924
3925 return 0;
3926 err1:
3927 kfree(trans);
3928 return err;
3929 }
3930
3931 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3932 struct sk_buff *skb, const struct nlmsghdr *nlh,
3933 const struct nlattr * const nla[])
3934 {
3935 u8 genmask = nft_genmask_next(net);
3936 const struct nlattr *attr;
3937 struct nft_set *set;
3938 struct nft_ctx ctx;
3939 int rem, err = 0;
3940
3941 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3942 if (err < 0)
3943 return err;
3944
3945 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3946 genmask);
3947 if (IS_ERR(set))
3948 return PTR_ERR(set);
3949 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3950 return -EBUSY;
3951
3952 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
3953 struct nft_set_iter iter = {
3954 .genmask = genmask,
3955 .fn = nft_flush_set,
3956 .flush = true,
3957 };
3958 set->ops->walk(&ctx, set, &iter);
3959
3960 return iter.err;
3961 }
3962
3963 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3964 err = nft_del_setelem(&ctx, set, attr);
3965 if (err < 0)
3966 break;
3967
3968 set->ndeact++;
3969 }
3970 return err;
3971 }
3972
3973 void nft_set_gc_batch_release(struct rcu_head *rcu)
3974 {
3975 struct nft_set_gc_batch *gcb;
3976 unsigned int i;
3977
3978 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
3979 for (i = 0; i < gcb->head.cnt; i++)
3980 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
3981 kfree(gcb);
3982 }
3983 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
3984
3985 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
3986 gfp_t gfp)
3987 {
3988 struct nft_set_gc_batch *gcb;
3989
3990 gcb = kzalloc(sizeof(*gcb), gfp);
3991 if (gcb == NULL)
3992 return gcb;
3993 gcb->head.set = set;
3994 return gcb;
3995 }
3996 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
3997
3998 /*
3999 * Stateful objects
4000 */
4001
4002 /**
4003 * nft_register_obj- register nf_tables stateful object type
4004 * @obj: object type
4005 *
4006 * Registers the object type for use with nf_tables. Returns zero on
4007 * success or a negative errno code otherwise.
4008 */
4009 int nft_register_obj(struct nft_object_type *obj_type)
4010 {
4011 if (obj_type->type == NFT_OBJECT_UNSPEC)
4012 return -EINVAL;
4013
4014 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4015 list_add_rcu(&obj_type->list, &nf_tables_objects);
4016 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4017 return 0;
4018 }
4019 EXPORT_SYMBOL_GPL(nft_register_obj);
4020
4021 /**
4022 * nft_unregister_obj - unregister nf_tables object type
4023 * @obj: object type
4024 *
4025 * Unregisters the object type for use with nf_tables.
4026 */
4027 void nft_unregister_obj(struct nft_object_type *obj_type)
4028 {
4029 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4030 list_del_rcu(&obj_type->list);
4031 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4032 }
4033 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4034
4035 struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
4036 const struct nlattr *nla,
4037 u32 objtype, u8 genmask)
4038 {
4039 struct nft_object *obj;
4040
4041 list_for_each_entry(obj, &table->objects, list) {
4042 if (!nla_strcmp(nla, obj->name) &&
4043 objtype == obj->type->type &&
4044 nft_active_genmask(obj, genmask))
4045 return obj;
4046 }
4047 return ERR_PTR(-ENOENT);
4048 }
4049 EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
4050
4051 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4052 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4053 .len = NFT_TABLE_MAXNAMELEN - 1 },
4054 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4055 .len = NFT_OBJ_MAXNAMELEN - 1 },
4056 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4057 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4058 };
4059
4060 static struct nft_object *nft_obj_init(const struct nft_object_type *type,
4061 const struct nlattr *attr)
4062 {
4063 struct nlattr *tb[type->maxattr + 1];
4064 struct nft_object *obj;
4065 int err;
4066
4067 if (attr) {
4068 err = nla_parse_nested(tb, type->maxattr, attr, type->policy);
4069 if (err < 0)
4070 goto err1;
4071 } else {
4072 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4073 }
4074
4075 err = -ENOMEM;
4076 obj = kzalloc(sizeof(struct nft_object) + type->size, GFP_KERNEL);
4077 if (obj == NULL)
4078 goto err1;
4079
4080 err = type->init((const struct nlattr * const *)tb, obj);
4081 if (err < 0)
4082 goto err2;
4083
4084 obj->type = type;
4085 return obj;
4086 err2:
4087 kfree(obj);
4088 err1:
4089 return ERR_PTR(err);
4090 }
4091
4092 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
4093 struct nft_object *obj, bool reset)
4094 {
4095 struct nlattr *nest;
4096
4097 nest = nla_nest_start(skb, attr);
4098 if (!nest)
4099 goto nla_put_failure;
4100 if (obj->type->dump(skb, obj, reset) < 0)
4101 goto nla_put_failure;
4102 nla_nest_end(skb, nest);
4103 return 0;
4104
4105 nla_put_failure:
4106 return -1;
4107 }
4108
4109 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4110 {
4111 const struct nft_object_type *type;
4112
4113 list_for_each_entry(type, &nf_tables_objects, list) {
4114 if (objtype == type->type)
4115 return type;
4116 }
4117 return NULL;
4118 }
4119
4120 static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4121 {
4122 const struct nft_object_type *type;
4123
4124 type = __nft_obj_type_get(objtype);
4125 if (type != NULL && try_module_get(type->owner))
4126 return type;
4127
4128 #ifdef CONFIG_MODULES
4129 if (type == NULL) {
4130 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4131 request_module("nft-obj-%u", objtype);
4132 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4133 if (__nft_obj_type_get(objtype))
4134 return ERR_PTR(-EAGAIN);
4135 }
4136 #endif
4137 return ERR_PTR(-ENOENT);
4138 }
4139
4140 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4141 struct sk_buff *skb, const struct nlmsghdr *nlh,
4142 const struct nlattr * const nla[])
4143 {
4144 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4145 const struct nft_object_type *type;
4146 u8 genmask = nft_genmask_next(net);
4147 int family = nfmsg->nfgen_family;
4148 struct nft_af_info *afi;
4149 struct nft_table *table;
4150 struct nft_object *obj;
4151 struct nft_ctx ctx;
4152 u32 objtype;
4153 int err;
4154
4155 if (!nla[NFTA_OBJ_TYPE] ||
4156 !nla[NFTA_OBJ_NAME] ||
4157 !nla[NFTA_OBJ_DATA])
4158 return -EINVAL;
4159
4160 afi = nf_tables_afinfo_lookup(net, family, true);
4161 if (IS_ERR(afi))
4162 return PTR_ERR(afi);
4163
4164 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4165 if (IS_ERR(table))
4166 return PTR_ERR(table);
4167
4168 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4169 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4170 if (IS_ERR(obj)) {
4171 err = PTR_ERR(obj);
4172 if (err != -ENOENT)
4173 return err;
4174
4175 } else {
4176 if (nlh->nlmsg_flags & NLM_F_EXCL)
4177 return -EEXIST;
4178
4179 return 0;
4180 }
4181
4182 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4183
4184 type = nft_obj_type_get(objtype);
4185 if (IS_ERR(type))
4186 return PTR_ERR(type);
4187
4188 obj = nft_obj_init(type, nla[NFTA_OBJ_DATA]);
4189 if (IS_ERR(obj)) {
4190 err = PTR_ERR(obj);
4191 goto err1;
4192 }
4193 obj->table = table;
4194 nla_strlcpy(obj->name, nla[NFTA_OBJ_NAME], NFT_OBJ_MAXNAMELEN);
4195
4196 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4197 if (err < 0)
4198 goto err2;
4199
4200 list_add_tail_rcu(&obj->list, &table->objects);
4201 table->use++;
4202 return 0;
4203 err2:
4204 if (obj->type->destroy)
4205 obj->type->destroy(obj);
4206 kfree(obj);
4207 err1:
4208 module_put(type->owner);
4209 return err;
4210 }
4211
4212 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4213 u32 portid, u32 seq, int event, u32 flags,
4214 int family, const struct nft_table *table,
4215 struct nft_object *obj, bool reset)
4216 {
4217 struct nfgenmsg *nfmsg;
4218 struct nlmsghdr *nlh;
4219
4220 event |= NFNL_SUBSYS_NFTABLES << 8;
4221 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4222 if (nlh == NULL)
4223 goto nla_put_failure;
4224
4225 nfmsg = nlmsg_data(nlh);
4226 nfmsg->nfgen_family = family;
4227 nfmsg->version = NFNETLINK_V0;
4228 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4229
4230 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4231 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
4232 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->type->type)) ||
4233 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
4234 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
4235 goto nla_put_failure;
4236
4237 nlmsg_end(skb, nlh);
4238 return 0;
4239
4240 nla_put_failure:
4241 nlmsg_trim(skb, nlh);
4242 return -1;
4243 }
4244
4245 struct nft_obj_filter {
4246 char table[NFT_OBJ_MAXNAMELEN];
4247 u32 type;
4248 };
4249
4250 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4251 {
4252 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4253 const struct nft_af_info *afi;
4254 const struct nft_table *table;
4255 unsigned int idx = 0, s_idx = cb->args[0];
4256 struct nft_obj_filter *filter = cb->data;
4257 struct net *net = sock_net(skb->sk);
4258 int family = nfmsg->nfgen_family;
4259 struct nft_object *obj;
4260 bool reset = false;
4261
4262 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4263 reset = true;
4264
4265 rcu_read_lock();
4266 cb->seq = net->nft.base_seq;
4267
4268 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
4269 if (family != NFPROTO_UNSPEC && family != afi->family)
4270 continue;
4271
4272 list_for_each_entry_rcu(table, &afi->tables, list) {
4273 list_for_each_entry_rcu(obj, &table->objects, list) {
4274 if (!nft_is_active(net, obj))
4275 goto cont;
4276 if (idx < s_idx)
4277 goto cont;
4278 if (idx > s_idx)
4279 memset(&cb->args[1], 0,
4280 sizeof(cb->args) - sizeof(cb->args[0]));
4281 if (filter && filter->table[0] &&
4282 strcmp(filter->table, table->name))
4283 goto cont;
4284 if (filter &&
4285 filter->type != NFT_OBJECT_UNSPEC &&
4286 obj->type->type != filter->type)
4287 goto cont;
4288
4289 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4290 cb->nlh->nlmsg_seq,
4291 NFT_MSG_NEWOBJ,
4292 NLM_F_MULTI | NLM_F_APPEND,
4293 afi->family, table, obj, reset) < 0)
4294 goto done;
4295
4296 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4297 cont:
4298 idx++;
4299 }
4300 }
4301 }
4302 done:
4303 rcu_read_unlock();
4304
4305 cb->args[0] = idx;
4306 return skb->len;
4307 }
4308
4309 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4310 {
4311 kfree(cb->data);
4312
4313 return 0;
4314 }
4315
4316 static struct nft_obj_filter *
4317 nft_obj_filter_alloc(const struct nlattr * const nla[])
4318 {
4319 struct nft_obj_filter *filter;
4320
4321 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
4322 if (!filter)
4323 return ERR_PTR(-ENOMEM);
4324
4325 if (nla[NFTA_OBJ_TABLE])
4326 nla_strlcpy(filter->table, nla[NFTA_OBJ_TABLE],
4327 NFT_TABLE_MAXNAMELEN);
4328 if (nla[NFTA_OBJ_TYPE])
4329 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4330
4331 return filter;
4332 }
4333
4334 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
4335 struct sk_buff *skb, const struct nlmsghdr *nlh,
4336 const struct nlattr * const nla[])
4337 {
4338 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4339 u8 genmask = nft_genmask_cur(net);
4340 int family = nfmsg->nfgen_family;
4341 const struct nft_af_info *afi;
4342 const struct nft_table *table;
4343 struct nft_object *obj;
4344 struct sk_buff *skb2;
4345 bool reset = false;
4346 u32 objtype;
4347 int err;
4348
4349 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4350 struct netlink_dump_control c = {
4351 .dump = nf_tables_dump_obj,
4352 .done = nf_tables_dump_obj_done,
4353 };
4354
4355 if (nla[NFTA_OBJ_TABLE] ||
4356 nla[NFTA_OBJ_TYPE]) {
4357 struct nft_obj_filter *filter;
4358
4359 filter = nft_obj_filter_alloc(nla);
4360 if (IS_ERR(filter))
4361 return -ENOMEM;
4362
4363 c.data = filter;
4364 }
4365 return netlink_dump_start(nlsk, skb, nlh, &c);
4366 }
4367
4368 if (!nla[NFTA_OBJ_NAME] ||
4369 !nla[NFTA_OBJ_TYPE])
4370 return -EINVAL;
4371
4372 afi = nf_tables_afinfo_lookup(net, family, false);
4373 if (IS_ERR(afi))
4374 return PTR_ERR(afi);
4375
4376 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4377 if (IS_ERR(table))
4378 return PTR_ERR(table);
4379
4380 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4381 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4382 if (IS_ERR(obj))
4383 return PTR_ERR(obj);
4384
4385 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4386 if (!skb2)
4387 return -ENOMEM;
4388
4389 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4390 reset = true;
4391
4392 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
4393 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
4394 family, table, obj, reset);
4395 if (err < 0)
4396 goto err;
4397
4398 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4399 err:
4400 kfree_skb(skb2);
4401 return err;
4402
4403 return 0;
4404 }
4405
4406 static void nft_obj_destroy(struct nft_object *obj)
4407 {
4408 if (obj->type->destroy)
4409 obj->type->destroy(obj);
4410
4411 module_put(obj->type->owner);
4412 kfree(obj);
4413 }
4414
4415 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
4416 struct sk_buff *skb, const struct nlmsghdr *nlh,
4417 const struct nlattr * const nla[])
4418 {
4419 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4420 u8 genmask = nft_genmask_next(net);
4421 int family = nfmsg->nfgen_family;
4422 struct nft_af_info *afi;
4423 struct nft_table *table;
4424 struct nft_object *obj;
4425 struct nft_ctx ctx;
4426 u32 objtype;
4427
4428 if (!nla[NFTA_OBJ_TYPE] ||
4429 !nla[NFTA_OBJ_NAME])
4430 return -EINVAL;
4431
4432 afi = nf_tables_afinfo_lookup(net, family, true);
4433 if (IS_ERR(afi))
4434 return PTR_ERR(afi);
4435
4436 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4437 if (IS_ERR(table))
4438 return PTR_ERR(table);
4439
4440 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4441 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4442 if (IS_ERR(obj))
4443 return PTR_ERR(obj);
4444 if (obj->use > 0)
4445 return -EBUSY;
4446
4447 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4448
4449 return nft_delobj(&ctx, obj);
4450 }
4451
4452 int nft_obj_notify(struct net *net, struct nft_table *table,
4453 struct nft_object *obj, u32 portid, u32 seq, int event,
4454 int family, int report, gfp_t gfp)
4455 {
4456 struct sk_buff *skb;
4457 int err;
4458
4459 if (!report &&
4460 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4461 return 0;
4462
4463 err = -ENOBUFS;
4464 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
4465 if (skb == NULL)
4466 goto err;
4467
4468 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
4469 table, obj, false);
4470 if (err < 0) {
4471 kfree_skb(skb);
4472 goto err;
4473 }
4474
4475 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
4476 err:
4477 if (err < 0) {
4478 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
4479 }
4480 return err;
4481 }
4482 EXPORT_SYMBOL_GPL(nft_obj_notify);
4483
4484 static int nf_tables_obj_notify(const struct nft_ctx *ctx,
4485 struct nft_object *obj, int event)
4486 {
4487 return nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
4488 ctx->seq, event, ctx->afi->family, ctx->report,
4489 GFP_KERNEL);
4490 }
4491
4492 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
4493 u32 portid, u32 seq)
4494 {
4495 struct nlmsghdr *nlh;
4496 struct nfgenmsg *nfmsg;
4497 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
4498
4499 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
4500 if (nlh == NULL)
4501 goto nla_put_failure;
4502
4503 nfmsg = nlmsg_data(nlh);
4504 nfmsg->nfgen_family = AF_UNSPEC;
4505 nfmsg->version = NFNETLINK_V0;
4506 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4507
4508 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
4509 goto nla_put_failure;
4510
4511 nlmsg_end(skb, nlh);
4512 return 0;
4513
4514 nla_put_failure:
4515 nlmsg_trim(skb, nlh);
4516 return -EMSGSIZE;
4517 }
4518
4519 static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
4520 {
4521 struct nlmsghdr *nlh = nlmsg_hdr(skb);
4522 struct sk_buff *skb2;
4523 int err;
4524
4525 if (nlmsg_report(nlh) &&
4526 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4527 return 0;
4528
4529 err = -ENOBUFS;
4530 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4531 if (skb2 == NULL)
4532 goto err;
4533
4534 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4535 nlh->nlmsg_seq);
4536 if (err < 0) {
4537 kfree_skb(skb2);
4538 goto err;
4539 }
4540
4541 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
4542 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
4543 err:
4544 if (err < 0) {
4545 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4546 err);
4547 }
4548 return err;
4549 }
4550
4551 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
4552 struct sk_buff *skb, const struct nlmsghdr *nlh,
4553 const struct nlattr * const nla[])
4554 {
4555 struct sk_buff *skb2;
4556 int err;
4557
4558 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4559 if (skb2 == NULL)
4560 return -ENOMEM;
4561
4562 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4563 nlh->nlmsg_seq);
4564 if (err < 0)
4565 goto err;
4566
4567 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4568 err:
4569 kfree_skb(skb2);
4570 return err;
4571 }
4572
4573 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
4574 [NFT_MSG_NEWTABLE] = {
4575 .call_batch = nf_tables_newtable,
4576 .attr_count = NFTA_TABLE_MAX,
4577 .policy = nft_table_policy,
4578 },
4579 [NFT_MSG_GETTABLE] = {
4580 .call = nf_tables_gettable,
4581 .attr_count = NFTA_TABLE_MAX,
4582 .policy = nft_table_policy,
4583 },
4584 [NFT_MSG_DELTABLE] = {
4585 .call_batch = nf_tables_deltable,
4586 .attr_count = NFTA_TABLE_MAX,
4587 .policy = nft_table_policy,
4588 },
4589 [NFT_MSG_NEWCHAIN] = {
4590 .call_batch = nf_tables_newchain,
4591 .attr_count = NFTA_CHAIN_MAX,
4592 .policy = nft_chain_policy,
4593 },
4594 [NFT_MSG_GETCHAIN] = {
4595 .call = nf_tables_getchain,
4596 .attr_count = NFTA_CHAIN_MAX,
4597 .policy = nft_chain_policy,
4598 },
4599 [NFT_MSG_DELCHAIN] = {
4600 .call_batch = nf_tables_delchain,
4601 .attr_count = NFTA_CHAIN_MAX,
4602 .policy = nft_chain_policy,
4603 },
4604 [NFT_MSG_NEWRULE] = {
4605 .call_batch = nf_tables_newrule,
4606 .attr_count = NFTA_RULE_MAX,
4607 .policy = nft_rule_policy,
4608 },
4609 [NFT_MSG_GETRULE] = {
4610 .call = nf_tables_getrule,
4611 .attr_count = NFTA_RULE_MAX,
4612 .policy = nft_rule_policy,
4613 },
4614 [NFT_MSG_DELRULE] = {
4615 .call_batch = nf_tables_delrule,
4616 .attr_count = NFTA_RULE_MAX,
4617 .policy = nft_rule_policy,
4618 },
4619 [NFT_MSG_NEWSET] = {
4620 .call_batch = nf_tables_newset,
4621 .attr_count = NFTA_SET_MAX,
4622 .policy = nft_set_policy,
4623 },
4624 [NFT_MSG_GETSET] = {
4625 .call = nf_tables_getset,
4626 .attr_count = NFTA_SET_MAX,
4627 .policy = nft_set_policy,
4628 },
4629 [NFT_MSG_DELSET] = {
4630 .call_batch = nf_tables_delset,
4631 .attr_count = NFTA_SET_MAX,
4632 .policy = nft_set_policy,
4633 },
4634 [NFT_MSG_NEWSETELEM] = {
4635 .call_batch = nf_tables_newsetelem,
4636 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4637 .policy = nft_set_elem_list_policy,
4638 },
4639 [NFT_MSG_GETSETELEM] = {
4640 .call = nf_tables_getsetelem,
4641 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4642 .policy = nft_set_elem_list_policy,
4643 },
4644 [NFT_MSG_DELSETELEM] = {
4645 .call_batch = nf_tables_delsetelem,
4646 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4647 .policy = nft_set_elem_list_policy,
4648 },
4649 [NFT_MSG_GETGEN] = {
4650 .call = nf_tables_getgen,
4651 },
4652 [NFT_MSG_NEWOBJ] = {
4653 .call_batch = nf_tables_newobj,
4654 .attr_count = NFTA_OBJ_MAX,
4655 .policy = nft_obj_policy,
4656 },
4657 [NFT_MSG_GETOBJ] = {
4658 .call = nf_tables_getobj,
4659 .attr_count = NFTA_OBJ_MAX,
4660 .policy = nft_obj_policy,
4661 },
4662 [NFT_MSG_DELOBJ] = {
4663 .call_batch = nf_tables_delobj,
4664 .attr_count = NFTA_OBJ_MAX,
4665 .policy = nft_obj_policy,
4666 },
4667 [NFT_MSG_GETOBJ_RESET] = {
4668 .call = nf_tables_getobj,
4669 .attr_count = NFTA_OBJ_MAX,
4670 .policy = nft_obj_policy,
4671 },
4672 };
4673
4674 static void nft_chain_commit_update(struct nft_trans *trans)
4675 {
4676 struct nft_base_chain *basechain;
4677
4678 if (nft_trans_chain_name(trans)[0])
4679 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
4680
4681 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
4682 return;
4683
4684 basechain = nft_base_chain(trans->ctx.chain);
4685 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
4686
4687 switch (nft_trans_chain_policy(trans)) {
4688 case NF_DROP:
4689 case NF_ACCEPT:
4690 basechain->policy = nft_trans_chain_policy(trans);
4691 break;
4692 }
4693 }
4694
4695 static void nf_tables_commit_release(struct nft_trans *trans)
4696 {
4697 switch (trans->msg_type) {
4698 case NFT_MSG_DELTABLE:
4699 nf_tables_table_destroy(&trans->ctx);
4700 break;
4701 case NFT_MSG_DELCHAIN:
4702 nf_tables_chain_destroy(trans->ctx.chain);
4703 break;
4704 case NFT_MSG_DELRULE:
4705 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4706 break;
4707 case NFT_MSG_DELSET:
4708 nft_set_destroy(nft_trans_set(trans));
4709 break;
4710 case NFT_MSG_DELSETELEM:
4711 nft_set_elem_destroy(nft_trans_elem_set(trans),
4712 nft_trans_elem(trans).priv, true);
4713 break;
4714 case NFT_MSG_DELOBJ:
4715 nft_obj_destroy(nft_trans_obj(trans));
4716 break;
4717 }
4718 kfree(trans);
4719 }
4720
4721 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
4722 {
4723 struct nft_trans *trans, *next;
4724 struct nft_trans_elem *te;
4725
4726 /* Bump generation counter, invalidate any dump in progress */
4727 while (++net->nft.base_seq == 0);
4728
4729 /* A new generation has just started */
4730 net->nft.gencursor = nft_gencursor_next(net);
4731
4732 /* Make sure all packets have left the previous generation before
4733 * purging old rules.
4734 */
4735 synchronize_rcu();
4736
4737 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4738 switch (trans->msg_type) {
4739 case NFT_MSG_NEWTABLE:
4740 if (nft_trans_table_update(trans)) {
4741 if (!nft_trans_table_enable(trans)) {
4742 nf_tables_table_disable(net,
4743 trans->ctx.afi,
4744 trans->ctx.table);
4745 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4746 }
4747 } else {
4748 nft_clear(net, trans->ctx.table);
4749 }
4750 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
4751 nft_trans_destroy(trans);
4752 break;
4753 case NFT_MSG_DELTABLE:
4754 list_del_rcu(&trans->ctx.table->list);
4755 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
4756 break;
4757 case NFT_MSG_NEWCHAIN:
4758 if (nft_trans_chain_update(trans))
4759 nft_chain_commit_update(trans);
4760 else
4761 nft_clear(net, trans->ctx.chain);
4762
4763 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
4764 nft_trans_destroy(trans);
4765 break;
4766 case NFT_MSG_DELCHAIN:
4767 list_del_rcu(&trans->ctx.chain->list);
4768 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
4769 nf_tables_unregister_hooks(trans->ctx.net,
4770 trans->ctx.table,
4771 trans->ctx.chain,
4772 trans->ctx.afi->nops);
4773 break;
4774 case NFT_MSG_NEWRULE:
4775 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4776 nf_tables_rule_notify(&trans->ctx,
4777 nft_trans_rule(trans),
4778 NFT_MSG_NEWRULE);
4779 nft_trans_destroy(trans);
4780 break;
4781 case NFT_MSG_DELRULE:
4782 list_del_rcu(&nft_trans_rule(trans)->list);
4783 nf_tables_rule_notify(&trans->ctx,
4784 nft_trans_rule(trans),
4785 NFT_MSG_DELRULE);
4786 break;
4787 case NFT_MSG_NEWSET:
4788 nft_clear(net, nft_trans_set(trans));
4789 /* This avoids hitting -EBUSY when deleting the table
4790 * from the transaction.
4791 */
4792 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4793 !list_empty(&nft_trans_set(trans)->bindings))
4794 trans->ctx.table->use--;
4795
4796 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4797 NFT_MSG_NEWSET, GFP_KERNEL);
4798 nft_trans_destroy(trans);
4799 break;
4800 case NFT_MSG_DELSET:
4801 list_del_rcu(&nft_trans_set(trans)->list);
4802 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4803 NFT_MSG_DELSET, GFP_KERNEL);
4804 break;
4805 case NFT_MSG_NEWSETELEM:
4806 te = (struct nft_trans_elem *)trans->data;
4807
4808 te->set->ops->activate(net, te->set, &te->elem);
4809 nf_tables_setelem_notify(&trans->ctx, te->set,
4810 &te->elem,
4811 NFT_MSG_NEWSETELEM, 0);
4812 nft_trans_destroy(trans);
4813 break;
4814 case NFT_MSG_DELSETELEM:
4815 te = (struct nft_trans_elem *)trans->data;
4816
4817 nf_tables_setelem_notify(&trans->ctx, te->set,
4818 &te->elem,
4819 NFT_MSG_DELSETELEM, 0);
4820 te->set->ops->remove(net, te->set, &te->elem);
4821 atomic_dec(&te->set->nelems);
4822 te->set->ndeact--;
4823 break;
4824 case NFT_MSG_NEWOBJ:
4825 nft_clear(net, nft_trans_obj(trans));
4826 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4827 NFT_MSG_NEWOBJ);
4828 nft_trans_destroy(trans);
4829 break;
4830 case NFT_MSG_DELOBJ:
4831 list_del_rcu(&nft_trans_obj(trans)->list);
4832 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4833 NFT_MSG_DELOBJ);
4834 break;
4835 }
4836 }
4837
4838 synchronize_rcu();
4839
4840 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4841 list_del(&trans->list);
4842 nf_tables_commit_release(trans);
4843 }
4844
4845 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
4846
4847 return 0;
4848 }
4849
4850 static void nf_tables_abort_release(struct nft_trans *trans)
4851 {
4852 switch (trans->msg_type) {
4853 case NFT_MSG_NEWTABLE:
4854 nf_tables_table_destroy(&trans->ctx);
4855 break;
4856 case NFT_MSG_NEWCHAIN:
4857 nf_tables_chain_destroy(trans->ctx.chain);
4858 break;
4859 case NFT_MSG_NEWRULE:
4860 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4861 break;
4862 case NFT_MSG_NEWSET:
4863 nft_set_destroy(nft_trans_set(trans));
4864 break;
4865 case NFT_MSG_NEWSETELEM:
4866 nft_set_elem_destroy(nft_trans_elem_set(trans),
4867 nft_trans_elem(trans).priv, true);
4868 break;
4869 case NFT_MSG_NEWOBJ:
4870 nft_obj_destroy(nft_trans_obj(trans));
4871 break;
4872 }
4873 kfree(trans);
4874 }
4875
4876 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
4877 {
4878 struct nft_trans *trans, *next;
4879 struct nft_trans_elem *te;
4880
4881 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4882 list) {
4883 switch (trans->msg_type) {
4884 case NFT_MSG_NEWTABLE:
4885 if (nft_trans_table_update(trans)) {
4886 if (nft_trans_table_enable(trans)) {
4887 nf_tables_table_disable(net,
4888 trans->ctx.afi,
4889 trans->ctx.table);
4890 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4891 }
4892 nft_trans_destroy(trans);
4893 } else {
4894 list_del_rcu(&trans->ctx.table->list);
4895 }
4896 break;
4897 case NFT_MSG_DELTABLE:
4898 nft_clear(trans->ctx.net, trans->ctx.table);
4899 nft_trans_destroy(trans);
4900 break;
4901 case NFT_MSG_NEWCHAIN:
4902 if (nft_trans_chain_update(trans)) {
4903 free_percpu(nft_trans_chain_stats(trans));
4904
4905 nft_trans_destroy(trans);
4906 } else {
4907 trans->ctx.table->use--;
4908 list_del_rcu(&trans->ctx.chain->list);
4909 nf_tables_unregister_hooks(trans->ctx.net,
4910 trans->ctx.table,
4911 trans->ctx.chain,
4912 trans->ctx.afi->nops);
4913 }
4914 break;
4915 case NFT_MSG_DELCHAIN:
4916 trans->ctx.table->use++;
4917 nft_clear(trans->ctx.net, trans->ctx.chain);
4918 nft_trans_destroy(trans);
4919 break;
4920 case NFT_MSG_NEWRULE:
4921 trans->ctx.chain->use--;
4922 list_del_rcu(&nft_trans_rule(trans)->list);
4923 break;
4924 case NFT_MSG_DELRULE:
4925 trans->ctx.chain->use++;
4926 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4927 nft_trans_destroy(trans);
4928 break;
4929 case NFT_MSG_NEWSET:
4930 trans->ctx.table->use--;
4931 list_del_rcu(&nft_trans_set(trans)->list);
4932 break;
4933 case NFT_MSG_DELSET:
4934 trans->ctx.table->use++;
4935 nft_clear(trans->ctx.net, nft_trans_set(trans));
4936 nft_trans_destroy(trans);
4937 break;
4938 case NFT_MSG_NEWSETELEM:
4939 te = (struct nft_trans_elem *)trans->data;
4940
4941 te->set->ops->remove(net, te->set, &te->elem);
4942 atomic_dec(&te->set->nelems);
4943 break;
4944 case NFT_MSG_DELSETELEM:
4945 te = (struct nft_trans_elem *)trans->data;
4946
4947 te->set->ops->activate(net, te->set, &te->elem);
4948 te->set->ndeact--;
4949
4950 nft_trans_destroy(trans);
4951 break;
4952 case NFT_MSG_NEWOBJ:
4953 trans->ctx.table->use--;
4954 list_del_rcu(&nft_trans_obj(trans)->list);
4955 break;
4956 case NFT_MSG_DELOBJ:
4957 trans->ctx.table->use++;
4958 nft_clear(trans->ctx.net, nft_trans_obj(trans));
4959 nft_trans_destroy(trans);
4960 break;
4961 }
4962 }
4963
4964 synchronize_rcu();
4965
4966 list_for_each_entry_safe_reverse(trans, next,
4967 &net->nft.commit_list, list) {
4968 list_del(&trans->list);
4969 nf_tables_abort_release(trans);
4970 }
4971
4972 return 0;
4973 }
4974
4975 static bool nf_tables_valid_genid(struct net *net, u32 genid)
4976 {
4977 return net->nft.base_seq == genid;
4978 }
4979
4980 static const struct nfnetlink_subsystem nf_tables_subsys = {
4981 .name = "nf_tables",
4982 .subsys_id = NFNL_SUBSYS_NFTABLES,
4983 .cb_count = NFT_MSG_MAX,
4984 .cb = nf_tables_cb,
4985 .commit = nf_tables_commit,
4986 .abort = nf_tables_abort,
4987 .valid_genid = nf_tables_valid_genid,
4988 };
4989
4990 int nft_chain_validate_dependency(const struct nft_chain *chain,
4991 enum nft_chain_type type)
4992 {
4993 const struct nft_base_chain *basechain;
4994
4995 if (chain->flags & NFT_BASE_CHAIN) {
4996 basechain = nft_base_chain(chain);
4997 if (basechain->type->type != type)
4998 return -EOPNOTSUPP;
4999 }
5000 return 0;
5001 }
5002 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
5003
5004 int nft_chain_validate_hooks(const struct nft_chain *chain,
5005 unsigned int hook_flags)
5006 {
5007 struct nft_base_chain *basechain;
5008
5009 if (chain->flags & NFT_BASE_CHAIN) {
5010 basechain = nft_base_chain(chain);
5011
5012 if ((1 << basechain->ops[0].hooknum) & hook_flags)
5013 return 0;
5014
5015 return -EOPNOTSUPP;
5016 }
5017
5018 return 0;
5019 }
5020 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
5021
5022 /*
5023 * Loop detection - walk through the ruleset beginning at the destination chain
5024 * of a new jump until either the source chain is reached (loop) or all
5025 * reachable chains have been traversed.
5026 *
5027 * The loop check is performed whenever a new jump verdict is added to an
5028 * expression or verdict map or a verdict map is bound to a new chain.
5029 */
5030
5031 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5032 const struct nft_chain *chain);
5033
5034 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
5035 struct nft_set *set,
5036 const struct nft_set_iter *iter,
5037 struct nft_set_elem *elem)
5038 {
5039 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5040 const struct nft_data *data;
5041
5042 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5043 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
5044 return 0;
5045
5046 data = nft_set_ext_data(ext);
5047 switch (data->verdict.code) {
5048 case NFT_JUMP:
5049 case NFT_GOTO:
5050 return nf_tables_check_loops(ctx, data->verdict.chain);
5051 default:
5052 return 0;
5053 }
5054 }
5055
5056 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5057 const struct nft_chain *chain)
5058 {
5059 const struct nft_rule *rule;
5060 const struct nft_expr *expr, *last;
5061 struct nft_set *set;
5062 struct nft_set_binding *binding;
5063 struct nft_set_iter iter;
5064
5065 if (ctx->chain == chain)
5066 return -ELOOP;
5067
5068 list_for_each_entry(rule, &chain->rules, list) {
5069 nft_rule_for_each_expr(expr, last, rule) {
5070 const struct nft_data *data = NULL;
5071 int err;
5072
5073 if (!expr->ops->validate)
5074 continue;
5075
5076 err = expr->ops->validate(ctx, expr, &data);
5077 if (err < 0)
5078 return err;
5079
5080 if (data == NULL)
5081 continue;
5082
5083 switch (data->verdict.code) {
5084 case NFT_JUMP:
5085 case NFT_GOTO:
5086 err = nf_tables_check_loops(ctx,
5087 data->verdict.chain);
5088 if (err < 0)
5089 return err;
5090 default:
5091 break;
5092 }
5093 }
5094 }
5095
5096 list_for_each_entry(set, &ctx->table->sets, list) {
5097 if (!nft_is_active_next(ctx->net, set))
5098 continue;
5099 if (!(set->flags & NFT_SET_MAP) ||
5100 set->dtype != NFT_DATA_VERDICT)
5101 continue;
5102
5103 list_for_each_entry(binding, &set->bindings, list) {
5104 if (!(binding->flags & NFT_SET_MAP) ||
5105 binding->chain != chain)
5106 continue;
5107
5108 iter.genmask = nft_genmask_next(ctx->net);
5109 iter.skip = 0;
5110 iter.count = 0;
5111 iter.err = 0;
5112 iter.fn = nf_tables_loop_check_setelem;
5113 iter.flush = false;
5114
5115 set->ops->walk(ctx, set, &iter);
5116 if (iter.err < 0)
5117 return iter.err;
5118 }
5119 }
5120
5121 return 0;
5122 }
5123
5124 /**
5125 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
5126 *
5127 * @attr: netlink attribute to fetch value from
5128 * @max: maximum value to be stored in dest
5129 * @dest: pointer to the variable
5130 *
5131 * Parse, check and store a given u32 netlink attribute into variable.
5132 * This function returns -ERANGE if the value goes over maximum value.
5133 * Otherwise a 0 is returned and the attribute value is stored in the
5134 * destination variable.
5135 */
5136 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
5137 {
5138 u32 val;
5139
5140 val = ntohl(nla_get_be32(attr));
5141 if (val > max)
5142 return -ERANGE;
5143
5144 *dest = val;
5145 return 0;
5146 }
5147 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
5148
5149 /**
5150 * nft_parse_register - parse a register value from a netlink attribute
5151 *
5152 * @attr: netlink attribute
5153 *
5154 * Parse and translate a register value from a netlink attribute.
5155 * Registers used to be 128 bit wide, these register numbers will be
5156 * mapped to the corresponding 32 bit register numbers.
5157 */
5158 unsigned int nft_parse_register(const struct nlattr *attr)
5159 {
5160 unsigned int reg;
5161
5162 reg = ntohl(nla_get_be32(attr));
5163 switch (reg) {
5164 case NFT_REG_VERDICT...NFT_REG_4:
5165 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
5166 default:
5167 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
5168 }
5169 }
5170 EXPORT_SYMBOL_GPL(nft_parse_register);
5171
5172 /**
5173 * nft_dump_register - dump a register value to a netlink attribute
5174 *
5175 * @skb: socket buffer
5176 * @attr: attribute number
5177 * @reg: register number
5178 *
5179 * Construct a netlink attribute containing the register number. For
5180 * compatibility reasons, register numbers being a multiple of 4 are
5181 * translated to the corresponding 128 bit register numbers.
5182 */
5183 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
5184 {
5185 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
5186 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
5187 else
5188 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
5189
5190 return nla_put_be32(skb, attr, htonl(reg));
5191 }
5192 EXPORT_SYMBOL_GPL(nft_dump_register);
5193
5194 /**
5195 * nft_validate_register_load - validate a load from a register
5196 *
5197 * @reg: the register number
5198 * @len: the length of the data
5199 *
5200 * Validate that the input register is one of the general purpose
5201 * registers and that the length of the load is within the bounds.
5202 */
5203 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
5204 {
5205 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5206 return -EINVAL;
5207 if (len == 0)
5208 return -EINVAL;
5209 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
5210 return -ERANGE;
5211
5212 return 0;
5213 }
5214 EXPORT_SYMBOL_GPL(nft_validate_register_load);
5215
5216 /**
5217 * nft_validate_register_store - validate an expressions' register store
5218 *
5219 * @ctx: context of the expression performing the load
5220 * @reg: the destination register number
5221 * @data: the data to load
5222 * @type: the data type
5223 * @len: the length of the data
5224 *
5225 * Validate that a data load uses the appropriate data type for
5226 * the destination register and the length is within the bounds.
5227 * A value of NULL for the data means that its runtime gathered
5228 * data.
5229 */
5230 int nft_validate_register_store(const struct nft_ctx *ctx,
5231 enum nft_registers reg,
5232 const struct nft_data *data,
5233 enum nft_data_types type, unsigned int len)
5234 {
5235 int err;
5236
5237 switch (reg) {
5238 case NFT_REG_VERDICT:
5239 if (type != NFT_DATA_VERDICT)
5240 return -EINVAL;
5241
5242 if (data != NULL &&
5243 (data->verdict.code == NFT_GOTO ||
5244 data->verdict.code == NFT_JUMP)) {
5245 err = nf_tables_check_loops(ctx, data->verdict.chain);
5246 if (err < 0)
5247 return err;
5248
5249 if (ctx->chain->level + 1 >
5250 data->verdict.chain->level) {
5251 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
5252 return -EMLINK;
5253 data->verdict.chain->level = ctx->chain->level + 1;
5254 }
5255 }
5256
5257 return 0;
5258 default:
5259 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5260 return -EINVAL;
5261 if (len == 0)
5262 return -EINVAL;
5263 if (reg * NFT_REG32_SIZE + len >
5264 FIELD_SIZEOF(struct nft_regs, data))
5265 return -ERANGE;
5266
5267 if (data != NULL && type != NFT_DATA_VALUE)
5268 return -EINVAL;
5269 return 0;
5270 }
5271 }
5272 EXPORT_SYMBOL_GPL(nft_validate_register_store);
5273
5274 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
5275 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
5276 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
5277 .len = NFT_CHAIN_MAXNAMELEN - 1 },
5278 };
5279
5280 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
5281 struct nft_data_desc *desc, const struct nlattr *nla)
5282 {
5283 u8 genmask = nft_genmask_next(ctx->net);
5284 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
5285 struct nft_chain *chain;
5286 int err;
5287
5288 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
5289 if (err < 0)
5290 return err;
5291
5292 if (!tb[NFTA_VERDICT_CODE])
5293 return -EINVAL;
5294 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
5295
5296 switch (data->verdict.code) {
5297 default:
5298 switch (data->verdict.code & NF_VERDICT_MASK) {
5299 case NF_ACCEPT:
5300 case NF_DROP:
5301 case NF_QUEUE:
5302 break;
5303 default:
5304 return -EINVAL;
5305 }
5306 /* fall through */
5307 case NFT_CONTINUE:
5308 case NFT_BREAK:
5309 case NFT_RETURN:
5310 break;
5311 case NFT_JUMP:
5312 case NFT_GOTO:
5313 if (!tb[NFTA_VERDICT_CHAIN])
5314 return -EINVAL;
5315 chain = nf_tables_chain_lookup(ctx->table,
5316 tb[NFTA_VERDICT_CHAIN], genmask);
5317 if (IS_ERR(chain))
5318 return PTR_ERR(chain);
5319 if (chain->flags & NFT_BASE_CHAIN)
5320 return -EOPNOTSUPP;
5321
5322 chain->use++;
5323 data->verdict.chain = chain;
5324 break;
5325 }
5326
5327 desc->len = sizeof(data->verdict);
5328 desc->type = NFT_DATA_VERDICT;
5329 return 0;
5330 }
5331
5332 static void nft_verdict_uninit(const struct nft_data *data)
5333 {
5334 switch (data->verdict.code) {
5335 case NFT_JUMP:
5336 case NFT_GOTO:
5337 data->verdict.chain->use--;
5338 break;
5339 }
5340 }
5341
5342 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
5343 {
5344 struct nlattr *nest;
5345
5346 nest = nla_nest_start(skb, type);
5347 if (!nest)
5348 goto nla_put_failure;
5349
5350 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
5351 goto nla_put_failure;
5352
5353 switch (v->code) {
5354 case NFT_JUMP:
5355 case NFT_GOTO:
5356 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
5357 v->chain->name))
5358 goto nla_put_failure;
5359 }
5360 nla_nest_end(skb, nest);
5361 return 0;
5362
5363 nla_put_failure:
5364 return -1;
5365 }
5366
5367 static int nft_value_init(const struct nft_ctx *ctx,
5368 struct nft_data *data, unsigned int size,
5369 struct nft_data_desc *desc, const struct nlattr *nla)
5370 {
5371 unsigned int len;
5372
5373 len = nla_len(nla);
5374 if (len == 0)
5375 return -EINVAL;
5376 if (len > size)
5377 return -EOVERFLOW;
5378
5379 nla_memcpy(data->data, nla, len);
5380 desc->type = NFT_DATA_VALUE;
5381 desc->len = len;
5382 return 0;
5383 }
5384
5385 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
5386 unsigned int len)
5387 {
5388 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
5389 }
5390
5391 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
5392 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
5393 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
5394 };
5395
5396 /**
5397 * nft_data_init - parse nf_tables data netlink attributes
5398 *
5399 * @ctx: context of the expression using the data
5400 * @data: destination struct nft_data
5401 * @size: maximum data length
5402 * @desc: data description
5403 * @nla: netlink attribute containing data
5404 *
5405 * Parse the netlink data attributes and initialize a struct nft_data.
5406 * The type and length of data are returned in the data description.
5407 *
5408 * The caller can indicate that it only wants to accept data of type
5409 * NFT_DATA_VALUE by passing NULL for the ctx argument.
5410 */
5411 int nft_data_init(const struct nft_ctx *ctx,
5412 struct nft_data *data, unsigned int size,
5413 struct nft_data_desc *desc, const struct nlattr *nla)
5414 {
5415 struct nlattr *tb[NFTA_DATA_MAX + 1];
5416 int err;
5417
5418 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
5419 if (err < 0)
5420 return err;
5421
5422 if (tb[NFTA_DATA_VALUE])
5423 return nft_value_init(ctx, data, size, desc,
5424 tb[NFTA_DATA_VALUE]);
5425 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
5426 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
5427 return -EINVAL;
5428 }
5429 EXPORT_SYMBOL_GPL(nft_data_init);
5430
5431 /**
5432 * nft_data_uninit - release a nft_data item
5433 *
5434 * @data: struct nft_data to release
5435 * @type: type of data
5436 *
5437 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5438 * all others need to be released by calling this function.
5439 */
5440 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
5441 {
5442 if (type < NFT_DATA_VERDICT)
5443 return;
5444 switch (type) {
5445 case NFT_DATA_VERDICT:
5446 return nft_verdict_uninit(data);
5447 default:
5448 WARN_ON(1);
5449 }
5450 }
5451 EXPORT_SYMBOL_GPL(nft_data_uninit);
5452
5453 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
5454 enum nft_data_types type, unsigned int len)
5455 {
5456 struct nlattr *nest;
5457 int err;
5458
5459 nest = nla_nest_start(skb, attr);
5460 if (nest == NULL)
5461 return -1;
5462
5463 switch (type) {
5464 case NFT_DATA_VALUE:
5465 err = nft_value_dump(skb, data, len);
5466 break;
5467 case NFT_DATA_VERDICT:
5468 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
5469 break;
5470 default:
5471 err = -EINVAL;
5472 WARN_ON(1);
5473 }
5474
5475 nla_nest_end(skb, nest);
5476 return err;
5477 }
5478 EXPORT_SYMBOL_GPL(nft_data_dump);
5479
5480 static int __net_init nf_tables_init_net(struct net *net)
5481 {
5482 INIT_LIST_HEAD(&net->nft.af_info);
5483 INIT_LIST_HEAD(&net->nft.commit_list);
5484 net->nft.base_seq = 1;
5485 return 0;
5486 }
5487
5488 int __nft_release_basechain(struct nft_ctx *ctx)
5489 {
5490 struct nft_rule *rule, *nr;
5491
5492 BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
5493
5494 nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
5495 ctx->afi->nops);
5496 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
5497 list_del(&rule->list);
5498 ctx->chain->use--;
5499 nf_tables_rule_destroy(ctx, rule);
5500 }
5501 list_del(&ctx->chain->list);
5502 ctx->table->use--;
5503 nf_tables_chain_destroy(ctx->chain);
5504
5505 return 0;
5506 }
5507 EXPORT_SYMBOL_GPL(__nft_release_basechain);
5508
5509 /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
5510 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
5511 {
5512 struct nft_table *table, *nt;
5513 struct nft_chain *chain, *nc;
5514 struct nft_object *obj, *ne;
5515 struct nft_rule *rule, *nr;
5516 struct nft_set *set, *ns;
5517 struct nft_ctx ctx = {
5518 .net = net,
5519 .afi = afi,
5520 };
5521
5522 list_for_each_entry_safe(table, nt, &afi->tables, list) {
5523 list_for_each_entry(chain, &table->chains, list)
5524 nf_tables_unregister_hooks(net, table, chain,
5525 afi->nops);
5526 /* No packets are walking on these chains anymore. */
5527 ctx.table = table;
5528 list_for_each_entry(chain, &table->chains, list) {
5529 ctx.chain = chain;
5530 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
5531 list_del(&rule->list);
5532 chain->use--;
5533 nf_tables_rule_destroy(&ctx, rule);
5534 }
5535 }
5536 list_for_each_entry_safe(set, ns, &table->sets, list) {
5537 list_del(&set->list);
5538 table->use--;
5539 nft_set_destroy(set);
5540 }
5541 list_for_each_entry_safe(obj, ne, &table->objects, list) {
5542 list_del(&obj->list);
5543 table->use--;
5544 nft_obj_destroy(obj);
5545 }
5546 list_for_each_entry_safe(chain, nc, &table->chains, list) {
5547 list_del(&chain->list);
5548 table->use--;
5549 nf_tables_chain_destroy(chain);
5550 }
5551 list_del(&table->list);
5552 nf_tables_table_destroy(&ctx);
5553 }
5554 }
5555
5556 static struct pernet_operations nf_tables_net_ops = {
5557 .init = nf_tables_init_net,
5558 };
5559
5560 static int __init nf_tables_module_init(void)
5561 {
5562 int err;
5563
5564 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
5565 GFP_KERNEL);
5566 if (info == NULL) {
5567 err = -ENOMEM;
5568 goto err1;
5569 }
5570
5571 err = nf_tables_core_module_init();
5572 if (err < 0)
5573 goto err2;
5574
5575 err = nfnetlink_subsys_register(&nf_tables_subsys);
5576 if (err < 0)
5577 goto err3;
5578
5579 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
5580 return register_pernet_subsys(&nf_tables_net_ops);
5581 err3:
5582 nf_tables_core_module_exit();
5583 err2:
5584 kfree(info);
5585 err1:
5586 return err;
5587 }
5588
5589 static void __exit nf_tables_module_exit(void)
5590 {
5591 unregister_pernet_subsys(&nf_tables_net_ops);
5592 nfnetlink_subsys_unregister(&nf_tables_subsys);
5593 rcu_barrier();
5594 nf_tables_core_module_exit();
5595 kfree(info);
5596 }
5597
5598 module_init(nf_tables_module_init);
5599 module_exit(nf_tables_module_exit);
5600
5601 MODULE_LICENSE("GPL");
5602 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
5603 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
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