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Merge branch 'for-linus-4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/mason...
[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 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
244 nft_trans_rule_id(trans) =
245 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
246 }
247 nft_trans_rule(trans) = rule;
248 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
249
250 return trans;
251 }
252
253 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
254 {
255 struct nft_trans *trans;
256 int err;
257
258 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
259 if (trans == NULL)
260 return -ENOMEM;
261
262 err = nf_tables_delrule_deactivate(ctx, rule);
263 if (err < 0) {
264 nft_trans_destroy(trans);
265 return err;
266 }
267
268 return 0;
269 }
270
271 static int nft_delrule_by_chain(struct nft_ctx *ctx)
272 {
273 struct nft_rule *rule;
274 int err;
275
276 list_for_each_entry(rule, &ctx->chain->rules, list) {
277 err = nft_delrule(ctx, rule);
278 if (err < 0)
279 return err;
280 }
281 return 0;
282 }
283
284 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
285 struct nft_set *set)
286 {
287 struct nft_trans *trans;
288
289 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
290 if (trans == NULL)
291 return -ENOMEM;
292
293 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
294 nft_trans_set_id(trans) =
295 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
296 nft_activate_next(ctx->net, set);
297 }
298 nft_trans_set(trans) = set;
299 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
300
301 return 0;
302 }
303
304 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
305 {
306 int err;
307
308 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
309 if (err < 0)
310 return err;
311
312 nft_deactivate_next(ctx->net, set);
313 ctx->table->use--;
314
315 return err;
316 }
317
318 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
319 struct nft_object *obj)
320 {
321 struct nft_trans *trans;
322
323 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
324 if (trans == NULL)
325 return -ENOMEM;
326
327 if (msg_type == NFT_MSG_NEWOBJ)
328 nft_activate_next(ctx->net, obj);
329
330 nft_trans_obj(trans) = obj;
331 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
332
333 return 0;
334 }
335
336 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
337 {
338 int err;
339
340 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
341 if (err < 0)
342 return err;
343
344 nft_deactivate_next(ctx->net, obj);
345 ctx->table->use--;
346
347 return err;
348 }
349
350 /*
351 * Tables
352 */
353
354 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
355 const struct nlattr *nla,
356 u8 genmask)
357 {
358 struct nft_table *table;
359
360 list_for_each_entry(table, &afi->tables, list) {
361 if (!nla_strcmp(nla, table->name) &&
362 nft_active_genmask(table, genmask))
363 return table;
364 }
365 return NULL;
366 }
367
368 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
369 const struct nlattr *nla,
370 u8 genmask)
371 {
372 struct nft_table *table;
373
374 if (nla == NULL)
375 return ERR_PTR(-EINVAL);
376
377 table = nft_table_lookup(afi, nla, genmask);
378 if (table != NULL)
379 return table;
380
381 return ERR_PTR(-ENOENT);
382 }
383
384 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
385 {
386 return ++table->hgenerator;
387 }
388
389 static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
390
391 static const struct nf_chain_type *
392 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
393 {
394 int i;
395
396 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
397 if (chain_type[family][i] != NULL &&
398 !nla_strcmp(nla, chain_type[family][i]->name))
399 return chain_type[family][i];
400 }
401 return NULL;
402 }
403
404 static const struct nf_chain_type *
405 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
406 const struct nlattr *nla,
407 bool autoload)
408 {
409 const struct nf_chain_type *type;
410
411 type = __nf_tables_chain_type_lookup(afi->family, nla);
412 if (type != NULL)
413 return type;
414 #ifdef CONFIG_MODULES
415 if (autoload) {
416 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
417 request_module("nft-chain-%u-%.*s", afi->family,
418 nla_len(nla), (const char *)nla_data(nla));
419 nfnl_lock(NFNL_SUBSYS_NFTABLES);
420 type = __nf_tables_chain_type_lookup(afi->family, nla);
421 if (type != NULL)
422 return ERR_PTR(-EAGAIN);
423 }
424 #endif
425 return ERR_PTR(-ENOENT);
426 }
427
428 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
429 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
430 .len = NFT_TABLE_MAXNAMELEN - 1 },
431 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
432 };
433
434 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
435 u32 portid, u32 seq, int event, u32 flags,
436 int family, const struct nft_table *table)
437 {
438 struct nlmsghdr *nlh;
439 struct nfgenmsg *nfmsg;
440
441 event |= NFNL_SUBSYS_NFTABLES << 8;
442 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
443 if (nlh == NULL)
444 goto nla_put_failure;
445
446 nfmsg = nlmsg_data(nlh);
447 nfmsg->nfgen_family = family;
448 nfmsg->version = NFNETLINK_V0;
449 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
450
451 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
452 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
453 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
454 goto nla_put_failure;
455
456 nlmsg_end(skb, nlh);
457 return 0;
458
459 nla_put_failure:
460 nlmsg_trim(skb, nlh);
461 return -1;
462 }
463
464 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
465 {
466 struct sk_buff *skb;
467 int err;
468
469 if (!ctx->report &&
470 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
471 return;
472
473 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
474 if (skb == NULL)
475 goto err;
476
477 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
478 event, 0, ctx->afi->family, ctx->table);
479 if (err < 0) {
480 kfree_skb(skb);
481 goto err;
482 }
483
484 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
485 ctx->report, GFP_KERNEL);
486 return;
487 err:
488 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
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 void 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;
1057
1058 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1059 if (skb == NULL)
1060 goto err;
1061
1062 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1063 event, 0, ctx->afi->family, ctx->table,
1064 ctx->chain);
1065 if (err < 0) {
1066 kfree_skb(skb);
1067 goto err;
1068 }
1069
1070 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1071 ctx->report, GFP_KERNEL);
1072 return;
1073 err:
1074 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1075 }
1076
1077 static int nf_tables_dump_chains(struct sk_buff *skb,
1078 struct netlink_callback *cb)
1079 {
1080 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1081 const struct nft_af_info *afi;
1082 const struct nft_table *table;
1083 const struct nft_chain *chain;
1084 unsigned int idx = 0, s_idx = cb->args[0];
1085 struct net *net = sock_net(skb->sk);
1086 int family = nfmsg->nfgen_family;
1087
1088 rcu_read_lock();
1089 cb->seq = net->nft.base_seq;
1090
1091 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1092 if (family != NFPROTO_UNSPEC && family != afi->family)
1093 continue;
1094
1095 list_for_each_entry_rcu(table, &afi->tables, list) {
1096 list_for_each_entry_rcu(chain, &table->chains, list) {
1097 if (idx < s_idx)
1098 goto cont;
1099 if (idx > s_idx)
1100 memset(&cb->args[1], 0,
1101 sizeof(cb->args) - sizeof(cb->args[0]));
1102 if (!nft_is_active(net, chain))
1103 continue;
1104 if (nf_tables_fill_chain_info(skb, net,
1105 NETLINK_CB(cb->skb).portid,
1106 cb->nlh->nlmsg_seq,
1107 NFT_MSG_NEWCHAIN,
1108 NLM_F_MULTI,
1109 afi->family, table, chain) < 0)
1110 goto done;
1111
1112 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1113 cont:
1114 idx++;
1115 }
1116 }
1117 }
1118 done:
1119 rcu_read_unlock();
1120 cb->args[0] = idx;
1121 return skb->len;
1122 }
1123
1124 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1125 struct sk_buff *skb, const struct nlmsghdr *nlh,
1126 const struct nlattr * const nla[])
1127 {
1128 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1129 u8 genmask = nft_genmask_cur(net);
1130 const struct nft_af_info *afi;
1131 const struct nft_table *table;
1132 const struct nft_chain *chain;
1133 struct sk_buff *skb2;
1134 int family = nfmsg->nfgen_family;
1135 int err;
1136
1137 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1138 struct netlink_dump_control c = {
1139 .dump = nf_tables_dump_chains,
1140 };
1141 return netlink_dump_start(nlsk, skb, nlh, &c);
1142 }
1143
1144 afi = nf_tables_afinfo_lookup(net, family, false);
1145 if (IS_ERR(afi))
1146 return PTR_ERR(afi);
1147
1148 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1149 if (IS_ERR(table))
1150 return PTR_ERR(table);
1151
1152 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1153 if (IS_ERR(chain))
1154 return PTR_ERR(chain);
1155
1156 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1157 if (!skb2)
1158 return -ENOMEM;
1159
1160 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1161 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1162 family, table, chain);
1163 if (err < 0)
1164 goto err;
1165
1166 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1167
1168 err:
1169 kfree_skb(skb2);
1170 return err;
1171 }
1172
1173 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1174 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1175 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1176 };
1177
1178 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1179 {
1180 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1181 struct nft_stats __percpu *newstats;
1182 struct nft_stats *stats;
1183 int err;
1184
1185 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1186 if (err < 0)
1187 return ERR_PTR(err);
1188
1189 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1190 return ERR_PTR(-EINVAL);
1191
1192 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1193 if (newstats == NULL)
1194 return ERR_PTR(-ENOMEM);
1195
1196 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1197 * are not exposed to userspace.
1198 */
1199 preempt_disable();
1200 stats = this_cpu_ptr(newstats);
1201 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1202 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1203 preempt_enable();
1204
1205 return newstats;
1206 }
1207
1208 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1209 struct nft_stats __percpu *newstats)
1210 {
1211 if (newstats == NULL)
1212 return;
1213
1214 if (chain->stats) {
1215 struct nft_stats __percpu *oldstats =
1216 nft_dereference(chain->stats);
1217
1218 rcu_assign_pointer(chain->stats, newstats);
1219 synchronize_rcu();
1220 free_percpu(oldstats);
1221 } else
1222 rcu_assign_pointer(chain->stats, newstats);
1223 }
1224
1225 static void nf_tables_chain_destroy(struct nft_chain *chain)
1226 {
1227 BUG_ON(chain->use > 0);
1228
1229 if (chain->flags & NFT_BASE_CHAIN) {
1230 struct nft_base_chain *basechain = nft_base_chain(chain);
1231
1232 module_put(basechain->type->owner);
1233 free_percpu(basechain->stats);
1234 if (basechain->ops[0].dev != NULL)
1235 dev_put(basechain->ops[0].dev);
1236 kfree(basechain);
1237 } else {
1238 kfree(chain);
1239 }
1240 }
1241
1242 struct nft_chain_hook {
1243 u32 num;
1244 u32 priority;
1245 const struct nf_chain_type *type;
1246 struct net_device *dev;
1247 };
1248
1249 static int nft_chain_parse_hook(struct net *net,
1250 const struct nlattr * const nla[],
1251 struct nft_af_info *afi,
1252 struct nft_chain_hook *hook, bool create)
1253 {
1254 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1255 const struct nf_chain_type *type;
1256 struct net_device *dev;
1257 int err;
1258
1259 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1260 nft_hook_policy);
1261 if (err < 0)
1262 return err;
1263
1264 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1265 ha[NFTA_HOOK_PRIORITY] == NULL)
1266 return -EINVAL;
1267
1268 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1269 if (hook->num >= afi->nhooks)
1270 return -EINVAL;
1271
1272 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1273
1274 type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT];
1275 if (nla[NFTA_CHAIN_TYPE]) {
1276 type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE],
1277 create);
1278 if (IS_ERR(type))
1279 return PTR_ERR(type);
1280 }
1281 if (!(type->hook_mask & (1 << hook->num)))
1282 return -EOPNOTSUPP;
1283 if (!try_module_get(type->owner))
1284 return -ENOENT;
1285
1286 hook->type = type;
1287
1288 hook->dev = NULL;
1289 if (afi->flags & NFT_AF_NEEDS_DEV) {
1290 char ifname[IFNAMSIZ];
1291
1292 if (!ha[NFTA_HOOK_DEV]) {
1293 module_put(type->owner);
1294 return -EOPNOTSUPP;
1295 }
1296
1297 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1298 dev = dev_get_by_name(net, ifname);
1299 if (!dev) {
1300 module_put(type->owner);
1301 return -ENOENT;
1302 }
1303 hook->dev = dev;
1304 } else if (ha[NFTA_HOOK_DEV]) {
1305 module_put(type->owner);
1306 return -EOPNOTSUPP;
1307 }
1308
1309 return 0;
1310 }
1311
1312 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1313 {
1314 module_put(hook->type->owner);
1315 if (hook->dev != NULL)
1316 dev_put(hook->dev);
1317 }
1318
1319 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1320 struct sk_buff *skb, const struct nlmsghdr *nlh,
1321 const struct nlattr * const nla[])
1322 {
1323 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1324 const struct nlattr * uninitialized_var(name);
1325 struct nft_af_info *afi;
1326 struct nft_table *table;
1327 struct nft_chain *chain;
1328 struct nft_base_chain *basechain = NULL;
1329 u8 genmask = nft_genmask_next(net);
1330 int family = nfmsg->nfgen_family;
1331 u8 policy = NF_ACCEPT;
1332 u64 handle = 0;
1333 unsigned int i;
1334 struct nft_stats __percpu *stats;
1335 int err;
1336 bool create;
1337 struct nft_ctx ctx;
1338
1339 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1340
1341 afi = nf_tables_afinfo_lookup(net, family, true);
1342 if (IS_ERR(afi))
1343 return PTR_ERR(afi);
1344
1345 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1346 if (IS_ERR(table))
1347 return PTR_ERR(table);
1348
1349 chain = NULL;
1350 name = nla[NFTA_CHAIN_NAME];
1351
1352 if (nla[NFTA_CHAIN_HANDLE]) {
1353 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1354 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
1355 if (IS_ERR(chain))
1356 return PTR_ERR(chain);
1357 } else {
1358 chain = nf_tables_chain_lookup(table, name, genmask);
1359 if (IS_ERR(chain)) {
1360 if (PTR_ERR(chain) != -ENOENT)
1361 return PTR_ERR(chain);
1362 chain = NULL;
1363 }
1364 }
1365
1366 if (nla[NFTA_CHAIN_POLICY]) {
1367 if ((chain != NULL &&
1368 !(chain->flags & NFT_BASE_CHAIN)))
1369 return -EOPNOTSUPP;
1370
1371 if (chain == NULL &&
1372 nla[NFTA_CHAIN_HOOK] == NULL)
1373 return -EOPNOTSUPP;
1374
1375 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1376 switch (policy) {
1377 case NF_DROP:
1378 case NF_ACCEPT:
1379 break;
1380 default:
1381 return -EINVAL;
1382 }
1383 }
1384
1385 if (chain != NULL) {
1386 struct nft_stats *stats = NULL;
1387 struct nft_trans *trans;
1388
1389 if (nlh->nlmsg_flags & NLM_F_EXCL)
1390 return -EEXIST;
1391 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1392 return -EOPNOTSUPP;
1393
1394 if (nla[NFTA_CHAIN_HOOK]) {
1395 struct nft_base_chain *basechain;
1396 struct nft_chain_hook hook;
1397 struct nf_hook_ops *ops;
1398
1399 if (!(chain->flags & NFT_BASE_CHAIN))
1400 return -EBUSY;
1401
1402 err = nft_chain_parse_hook(net, nla, afi, &hook,
1403 create);
1404 if (err < 0)
1405 return err;
1406
1407 basechain = nft_base_chain(chain);
1408 if (basechain->type != hook.type) {
1409 nft_chain_release_hook(&hook);
1410 return -EBUSY;
1411 }
1412
1413 for (i = 0; i < afi->nops; i++) {
1414 ops = &basechain->ops[i];
1415 if (ops->hooknum != hook.num ||
1416 ops->priority != hook.priority ||
1417 ops->dev != hook.dev) {
1418 nft_chain_release_hook(&hook);
1419 return -EBUSY;
1420 }
1421 }
1422 nft_chain_release_hook(&hook);
1423 }
1424
1425 if (nla[NFTA_CHAIN_HANDLE] && name) {
1426 struct nft_chain *chain2;
1427
1428 chain2 = nf_tables_chain_lookup(table,
1429 nla[NFTA_CHAIN_NAME],
1430 genmask);
1431 if (IS_ERR(chain2))
1432 return PTR_ERR(chain2);
1433 }
1434
1435 if (nla[NFTA_CHAIN_COUNTERS]) {
1436 if (!(chain->flags & NFT_BASE_CHAIN))
1437 return -EOPNOTSUPP;
1438
1439 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1440 if (IS_ERR(stats))
1441 return PTR_ERR(stats);
1442 }
1443
1444 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1445 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1446 sizeof(struct nft_trans_chain));
1447 if (trans == NULL) {
1448 free_percpu(stats);
1449 return -ENOMEM;
1450 }
1451
1452 nft_trans_chain_stats(trans) = stats;
1453 nft_trans_chain_update(trans) = true;
1454
1455 if (nla[NFTA_CHAIN_POLICY])
1456 nft_trans_chain_policy(trans) = policy;
1457 else
1458 nft_trans_chain_policy(trans) = -1;
1459
1460 if (nla[NFTA_CHAIN_HANDLE] && name) {
1461 nla_strlcpy(nft_trans_chain_name(trans), name,
1462 NFT_CHAIN_MAXNAMELEN);
1463 }
1464 list_add_tail(&trans->list, &net->nft.commit_list);
1465 return 0;
1466 }
1467
1468 if (table->use == UINT_MAX)
1469 return -EOVERFLOW;
1470
1471 if (nla[NFTA_CHAIN_HOOK]) {
1472 struct nft_chain_hook hook;
1473 struct nf_hook_ops *ops;
1474 nf_hookfn *hookfn;
1475
1476 err = nft_chain_parse_hook(net, nla, afi, &hook, create);
1477 if (err < 0)
1478 return err;
1479
1480 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1481 if (basechain == NULL) {
1482 nft_chain_release_hook(&hook);
1483 return -ENOMEM;
1484 }
1485
1486 if (hook.dev != NULL)
1487 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1488
1489 if (nla[NFTA_CHAIN_COUNTERS]) {
1490 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1491 if (IS_ERR(stats)) {
1492 nft_chain_release_hook(&hook);
1493 kfree(basechain);
1494 return PTR_ERR(stats);
1495 }
1496 basechain->stats = stats;
1497 } else {
1498 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1499 if (stats == NULL) {
1500 nft_chain_release_hook(&hook);
1501 kfree(basechain);
1502 return -ENOMEM;
1503 }
1504 rcu_assign_pointer(basechain->stats, stats);
1505 }
1506
1507 hookfn = hook.type->hooks[hook.num];
1508 basechain->type = hook.type;
1509 chain = &basechain->chain;
1510
1511 for (i = 0; i < afi->nops; i++) {
1512 ops = &basechain->ops[i];
1513 ops->pf = family;
1514 ops->hooknum = hook.num;
1515 ops->priority = hook.priority;
1516 ops->priv = chain;
1517 ops->hook = afi->hooks[ops->hooknum];
1518 ops->dev = hook.dev;
1519 if (hookfn)
1520 ops->hook = hookfn;
1521 if (afi->hook_ops_init)
1522 afi->hook_ops_init(ops, i);
1523 }
1524
1525 chain->flags |= NFT_BASE_CHAIN;
1526 basechain->policy = policy;
1527 } else {
1528 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1529 if (chain == NULL)
1530 return -ENOMEM;
1531 }
1532
1533 INIT_LIST_HEAD(&chain->rules);
1534 chain->handle = nf_tables_alloc_handle(table);
1535 chain->table = table;
1536 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1537
1538 err = nf_tables_register_hooks(net, table, chain, afi->nops);
1539 if (err < 0)
1540 goto err1;
1541
1542 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1543 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1544 if (err < 0)
1545 goto err2;
1546
1547 table->use++;
1548 list_add_tail_rcu(&chain->list, &table->chains);
1549 return 0;
1550 err2:
1551 nf_tables_unregister_hooks(net, table, chain, afi->nops);
1552 err1:
1553 nf_tables_chain_destroy(chain);
1554 return err;
1555 }
1556
1557 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1558 struct sk_buff *skb, const struct nlmsghdr *nlh,
1559 const struct nlattr * const nla[])
1560 {
1561 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1562 u8 genmask = nft_genmask_next(net);
1563 struct nft_af_info *afi;
1564 struct nft_table *table;
1565 struct nft_chain *chain;
1566 int family = nfmsg->nfgen_family;
1567 struct nft_ctx ctx;
1568
1569 afi = nf_tables_afinfo_lookup(net, family, false);
1570 if (IS_ERR(afi))
1571 return PTR_ERR(afi);
1572
1573 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1574 if (IS_ERR(table))
1575 return PTR_ERR(table);
1576
1577 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1578 if (IS_ERR(chain))
1579 return PTR_ERR(chain);
1580 if (chain->use > 0)
1581 return -EBUSY;
1582
1583 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1584
1585 return nft_delchain(&ctx);
1586 }
1587
1588 /*
1589 * Expressions
1590 */
1591
1592 /**
1593 * nft_register_expr - register nf_tables expr type
1594 * @ops: expr type
1595 *
1596 * Registers the expr type for use with nf_tables. Returns zero on
1597 * success or a negative errno code otherwise.
1598 */
1599 int nft_register_expr(struct nft_expr_type *type)
1600 {
1601 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1602 if (type->family == NFPROTO_UNSPEC)
1603 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1604 else
1605 list_add_rcu(&type->list, &nf_tables_expressions);
1606 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1607 return 0;
1608 }
1609 EXPORT_SYMBOL_GPL(nft_register_expr);
1610
1611 /**
1612 * nft_unregister_expr - unregister nf_tables expr type
1613 * @ops: expr type
1614 *
1615 * Unregisters the expr typefor use with nf_tables.
1616 */
1617 void nft_unregister_expr(struct nft_expr_type *type)
1618 {
1619 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1620 list_del_rcu(&type->list);
1621 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1622 }
1623 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1624
1625 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1626 struct nlattr *nla)
1627 {
1628 const struct nft_expr_type *type;
1629
1630 list_for_each_entry(type, &nf_tables_expressions, list) {
1631 if (!nla_strcmp(nla, type->name) &&
1632 (!type->family || type->family == family))
1633 return type;
1634 }
1635 return NULL;
1636 }
1637
1638 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1639 struct nlattr *nla)
1640 {
1641 const struct nft_expr_type *type;
1642
1643 if (nla == NULL)
1644 return ERR_PTR(-EINVAL);
1645
1646 type = __nft_expr_type_get(family, nla);
1647 if (type != NULL && try_module_get(type->owner))
1648 return type;
1649
1650 #ifdef CONFIG_MODULES
1651 if (type == NULL) {
1652 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1653 request_module("nft-expr-%u-%.*s", family,
1654 nla_len(nla), (char *)nla_data(nla));
1655 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1656 if (__nft_expr_type_get(family, nla))
1657 return ERR_PTR(-EAGAIN);
1658
1659 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1660 request_module("nft-expr-%.*s",
1661 nla_len(nla), (char *)nla_data(nla));
1662 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1663 if (__nft_expr_type_get(family, nla))
1664 return ERR_PTR(-EAGAIN);
1665 }
1666 #endif
1667 return ERR_PTR(-ENOENT);
1668 }
1669
1670 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1671 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1672 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1673 };
1674
1675 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1676 const struct nft_expr *expr)
1677 {
1678 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1679 goto nla_put_failure;
1680
1681 if (expr->ops->dump) {
1682 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1683 if (data == NULL)
1684 goto nla_put_failure;
1685 if (expr->ops->dump(skb, expr) < 0)
1686 goto nla_put_failure;
1687 nla_nest_end(skb, data);
1688 }
1689
1690 return skb->len;
1691
1692 nla_put_failure:
1693 return -1;
1694 };
1695
1696 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1697 const struct nft_expr *expr)
1698 {
1699 struct nlattr *nest;
1700
1701 nest = nla_nest_start(skb, attr);
1702 if (!nest)
1703 goto nla_put_failure;
1704 if (nf_tables_fill_expr_info(skb, expr) < 0)
1705 goto nla_put_failure;
1706 nla_nest_end(skb, nest);
1707 return 0;
1708
1709 nla_put_failure:
1710 return -1;
1711 }
1712
1713 struct nft_expr_info {
1714 const struct nft_expr_ops *ops;
1715 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1716 };
1717
1718 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1719 const struct nlattr *nla,
1720 struct nft_expr_info *info)
1721 {
1722 const struct nft_expr_type *type;
1723 const struct nft_expr_ops *ops;
1724 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1725 int err;
1726
1727 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1728 if (err < 0)
1729 return err;
1730
1731 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1732 if (IS_ERR(type))
1733 return PTR_ERR(type);
1734
1735 if (tb[NFTA_EXPR_DATA]) {
1736 err = nla_parse_nested(info->tb, type->maxattr,
1737 tb[NFTA_EXPR_DATA], type->policy);
1738 if (err < 0)
1739 goto err1;
1740 } else
1741 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1742
1743 if (type->select_ops != NULL) {
1744 ops = type->select_ops(ctx,
1745 (const struct nlattr * const *)info->tb);
1746 if (IS_ERR(ops)) {
1747 err = PTR_ERR(ops);
1748 goto err1;
1749 }
1750 } else
1751 ops = type->ops;
1752
1753 info->ops = ops;
1754 return 0;
1755
1756 err1:
1757 module_put(type->owner);
1758 return err;
1759 }
1760
1761 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1762 const struct nft_expr_info *info,
1763 struct nft_expr *expr)
1764 {
1765 const struct nft_expr_ops *ops = info->ops;
1766 int err;
1767
1768 expr->ops = ops;
1769 if (ops->init) {
1770 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1771 if (err < 0)
1772 goto err1;
1773 }
1774
1775 return 0;
1776
1777 err1:
1778 expr->ops = NULL;
1779 return err;
1780 }
1781
1782 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1783 struct nft_expr *expr)
1784 {
1785 if (expr->ops->destroy)
1786 expr->ops->destroy(ctx, expr);
1787 module_put(expr->ops->type->owner);
1788 }
1789
1790 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1791 const struct nlattr *nla)
1792 {
1793 struct nft_expr_info info;
1794 struct nft_expr *expr;
1795 int err;
1796
1797 err = nf_tables_expr_parse(ctx, nla, &info);
1798 if (err < 0)
1799 goto err1;
1800
1801 err = -ENOMEM;
1802 expr = kzalloc(info.ops->size, GFP_KERNEL);
1803 if (expr == NULL)
1804 goto err2;
1805
1806 err = nf_tables_newexpr(ctx, &info, expr);
1807 if (err < 0)
1808 goto err3;
1809
1810 return expr;
1811 err3:
1812 kfree(expr);
1813 err2:
1814 module_put(info.ops->type->owner);
1815 err1:
1816 return ERR_PTR(err);
1817 }
1818
1819 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1820 {
1821 nf_tables_expr_destroy(ctx, expr);
1822 kfree(expr);
1823 }
1824
1825 /*
1826 * Rules
1827 */
1828
1829 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1830 u64 handle)
1831 {
1832 struct nft_rule *rule;
1833
1834 // FIXME: this sucks
1835 list_for_each_entry(rule, &chain->rules, list) {
1836 if (handle == rule->handle)
1837 return rule;
1838 }
1839
1840 return ERR_PTR(-ENOENT);
1841 }
1842
1843 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1844 const struct nlattr *nla)
1845 {
1846 if (nla == NULL)
1847 return ERR_PTR(-EINVAL);
1848
1849 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1850 }
1851
1852 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1853 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
1854 .len = NFT_TABLE_MAXNAMELEN - 1 },
1855 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1856 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1857 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1858 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1859 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1860 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1861 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1862 .len = NFT_USERDATA_MAXLEN },
1863 };
1864
1865 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1866 u32 portid, u32 seq, int event,
1867 u32 flags, int family,
1868 const struct nft_table *table,
1869 const struct nft_chain *chain,
1870 const struct nft_rule *rule)
1871 {
1872 struct nlmsghdr *nlh;
1873 struct nfgenmsg *nfmsg;
1874 const struct nft_expr *expr, *next;
1875 struct nlattr *list;
1876 const struct nft_rule *prule;
1877 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1878
1879 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1880 flags);
1881 if (nlh == NULL)
1882 goto nla_put_failure;
1883
1884 nfmsg = nlmsg_data(nlh);
1885 nfmsg->nfgen_family = family;
1886 nfmsg->version = NFNETLINK_V0;
1887 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1888
1889 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1890 goto nla_put_failure;
1891 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1892 goto nla_put_failure;
1893 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1894 NFTA_RULE_PAD))
1895 goto nla_put_failure;
1896
1897 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1898 prule = list_entry(rule->list.prev, struct nft_rule, list);
1899 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1900 cpu_to_be64(prule->handle),
1901 NFTA_RULE_PAD))
1902 goto nla_put_failure;
1903 }
1904
1905 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1906 if (list == NULL)
1907 goto nla_put_failure;
1908 nft_rule_for_each_expr(expr, next, rule) {
1909 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
1910 goto nla_put_failure;
1911 }
1912 nla_nest_end(skb, list);
1913
1914 if (rule->udata) {
1915 struct nft_userdata *udata = nft_userdata(rule);
1916 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1917 udata->data) < 0)
1918 goto nla_put_failure;
1919 }
1920
1921 nlmsg_end(skb, nlh);
1922 return 0;
1923
1924 nla_put_failure:
1925 nlmsg_trim(skb, nlh);
1926 return -1;
1927 }
1928
1929 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
1930 const struct nft_rule *rule, int event)
1931 {
1932 struct sk_buff *skb;
1933 int err;
1934
1935 if (!ctx->report &&
1936 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1937 return;
1938
1939 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1940 if (skb == NULL)
1941 goto err;
1942
1943 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1944 event, 0, ctx->afi->family, ctx->table,
1945 ctx->chain, rule);
1946 if (err < 0) {
1947 kfree_skb(skb);
1948 goto err;
1949 }
1950
1951 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1952 ctx->report, GFP_KERNEL);
1953 return;
1954 err:
1955 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1956 }
1957
1958 struct nft_rule_dump_ctx {
1959 char table[NFT_TABLE_MAXNAMELEN];
1960 char chain[NFT_CHAIN_MAXNAMELEN];
1961 };
1962
1963 static int nf_tables_dump_rules(struct sk_buff *skb,
1964 struct netlink_callback *cb)
1965 {
1966 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1967 const struct nft_rule_dump_ctx *ctx = cb->data;
1968 const struct nft_af_info *afi;
1969 const struct nft_table *table;
1970 const struct nft_chain *chain;
1971 const struct nft_rule *rule;
1972 unsigned int idx = 0, s_idx = cb->args[0];
1973 struct net *net = sock_net(skb->sk);
1974 int family = nfmsg->nfgen_family;
1975
1976 rcu_read_lock();
1977 cb->seq = net->nft.base_seq;
1978
1979 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1980 if (family != NFPROTO_UNSPEC && family != afi->family)
1981 continue;
1982
1983 list_for_each_entry_rcu(table, &afi->tables, list) {
1984 if (ctx && ctx->table[0] &&
1985 strcmp(ctx->table, table->name) != 0)
1986 continue;
1987
1988 list_for_each_entry_rcu(chain, &table->chains, list) {
1989 if (ctx && ctx->chain[0] &&
1990 strcmp(ctx->chain, chain->name) != 0)
1991 continue;
1992
1993 list_for_each_entry_rcu(rule, &chain->rules, list) {
1994 if (!nft_is_active(net, rule))
1995 goto cont;
1996 if (idx < s_idx)
1997 goto cont;
1998 if (idx > s_idx)
1999 memset(&cb->args[1], 0,
2000 sizeof(cb->args) - sizeof(cb->args[0]));
2001 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2002 cb->nlh->nlmsg_seq,
2003 NFT_MSG_NEWRULE,
2004 NLM_F_MULTI | NLM_F_APPEND,
2005 afi->family, table, chain, rule) < 0)
2006 goto done;
2007
2008 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2009 cont:
2010 idx++;
2011 }
2012 }
2013 }
2014 }
2015 done:
2016 rcu_read_unlock();
2017
2018 cb->args[0] = idx;
2019 return skb->len;
2020 }
2021
2022 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2023 {
2024 kfree(cb->data);
2025 return 0;
2026 }
2027
2028 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2029 struct sk_buff *skb, const struct nlmsghdr *nlh,
2030 const struct nlattr * const nla[])
2031 {
2032 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2033 u8 genmask = nft_genmask_cur(net);
2034 const struct nft_af_info *afi;
2035 const struct nft_table *table;
2036 const struct nft_chain *chain;
2037 const struct nft_rule *rule;
2038 struct sk_buff *skb2;
2039 int family = nfmsg->nfgen_family;
2040 int err;
2041
2042 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2043 struct netlink_dump_control c = {
2044 .dump = nf_tables_dump_rules,
2045 .done = nf_tables_dump_rules_done,
2046 };
2047
2048 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2049 struct nft_rule_dump_ctx *ctx;
2050
2051 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
2052 if (!ctx)
2053 return -ENOMEM;
2054
2055 if (nla[NFTA_RULE_TABLE])
2056 nla_strlcpy(ctx->table, nla[NFTA_RULE_TABLE],
2057 sizeof(ctx->table));
2058 if (nla[NFTA_RULE_CHAIN])
2059 nla_strlcpy(ctx->chain, nla[NFTA_RULE_CHAIN],
2060 sizeof(ctx->chain));
2061 c.data = ctx;
2062 }
2063
2064 return netlink_dump_start(nlsk, skb, nlh, &c);
2065 }
2066
2067 afi = nf_tables_afinfo_lookup(net, family, false);
2068 if (IS_ERR(afi))
2069 return PTR_ERR(afi);
2070
2071 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2072 if (IS_ERR(table))
2073 return PTR_ERR(table);
2074
2075 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2076 if (IS_ERR(chain))
2077 return PTR_ERR(chain);
2078
2079 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2080 if (IS_ERR(rule))
2081 return PTR_ERR(rule);
2082
2083 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2084 if (!skb2)
2085 return -ENOMEM;
2086
2087 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2088 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2089 family, table, chain, rule);
2090 if (err < 0)
2091 goto err;
2092
2093 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2094
2095 err:
2096 kfree_skb(skb2);
2097 return err;
2098 }
2099
2100 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2101 struct nft_rule *rule)
2102 {
2103 struct nft_expr *expr;
2104
2105 /*
2106 * Careful: some expressions might not be initialized in case this
2107 * is called on error from nf_tables_newrule().
2108 */
2109 expr = nft_expr_first(rule);
2110 while (expr != nft_expr_last(rule) && expr->ops) {
2111 nf_tables_expr_destroy(ctx, expr);
2112 expr = nft_expr_next(expr);
2113 }
2114 kfree(rule);
2115 }
2116
2117 #define NFT_RULE_MAXEXPRS 128
2118
2119 static struct nft_expr_info *info;
2120
2121 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2122 struct sk_buff *skb, const struct nlmsghdr *nlh,
2123 const struct nlattr * const nla[])
2124 {
2125 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2126 u8 genmask = nft_genmask_next(net);
2127 struct nft_af_info *afi;
2128 struct nft_table *table;
2129 struct nft_chain *chain;
2130 struct nft_rule *rule, *old_rule = NULL;
2131 struct nft_userdata *udata;
2132 struct nft_trans *trans = NULL;
2133 struct nft_expr *expr;
2134 struct nft_ctx ctx;
2135 struct nlattr *tmp;
2136 unsigned int size, i, n, ulen = 0, usize = 0;
2137 int err, rem;
2138 bool create;
2139 u64 handle, pos_handle;
2140
2141 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2142
2143 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2144 if (IS_ERR(afi))
2145 return PTR_ERR(afi);
2146
2147 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2148 if (IS_ERR(table))
2149 return PTR_ERR(table);
2150
2151 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2152 if (IS_ERR(chain))
2153 return PTR_ERR(chain);
2154
2155 if (nla[NFTA_RULE_HANDLE]) {
2156 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2157 rule = __nf_tables_rule_lookup(chain, handle);
2158 if (IS_ERR(rule))
2159 return PTR_ERR(rule);
2160
2161 if (nlh->nlmsg_flags & NLM_F_EXCL)
2162 return -EEXIST;
2163 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2164 old_rule = rule;
2165 else
2166 return -EOPNOTSUPP;
2167 } else {
2168 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2169 return -EINVAL;
2170 handle = nf_tables_alloc_handle(table);
2171
2172 if (chain->use == UINT_MAX)
2173 return -EOVERFLOW;
2174 }
2175
2176 if (nla[NFTA_RULE_POSITION]) {
2177 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2178 return -EOPNOTSUPP;
2179
2180 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2181 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2182 if (IS_ERR(old_rule))
2183 return PTR_ERR(old_rule);
2184 }
2185
2186 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2187
2188 n = 0;
2189 size = 0;
2190 if (nla[NFTA_RULE_EXPRESSIONS]) {
2191 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2192 err = -EINVAL;
2193 if (nla_type(tmp) != NFTA_LIST_ELEM)
2194 goto err1;
2195 if (n == NFT_RULE_MAXEXPRS)
2196 goto err1;
2197 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2198 if (err < 0)
2199 goto err1;
2200 size += info[n].ops->size;
2201 n++;
2202 }
2203 }
2204 /* Check for overflow of dlen field */
2205 err = -EFBIG;
2206 if (size >= 1 << 12)
2207 goto err1;
2208
2209 if (nla[NFTA_RULE_USERDATA]) {
2210 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2211 if (ulen > 0)
2212 usize = sizeof(struct nft_userdata) + ulen;
2213 }
2214
2215 err = -ENOMEM;
2216 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2217 if (rule == NULL)
2218 goto err1;
2219
2220 nft_activate_next(net, rule);
2221
2222 rule->handle = handle;
2223 rule->dlen = size;
2224 rule->udata = ulen ? 1 : 0;
2225
2226 if (ulen) {
2227 udata = nft_userdata(rule);
2228 udata->len = ulen - 1;
2229 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2230 }
2231
2232 expr = nft_expr_first(rule);
2233 for (i = 0; i < n; i++) {
2234 err = nf_tables_newexpr(&ctx, &info[i], expr);
2235 if (err < 0)
2236 goto err2;
2237 info[i].ops = NULL;
2238 expr = nft_expr_next(expr);
2239 }
2240
2241 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2242 if (nft_is_active_next(net, old_rule)) {
2243 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2244 old_rule);
2245 if (trans == NULL) {
2246 err = -ENOMEM;
2247 goto err2;
2248 }
2249 nft_deactivate_next(net, old_rule);
2250 chain->use--;
2251 list_add_tail_rcu(&rule->list, &old_rule->list);
2252 } else {
2253 err = -ENOENT;
2254 goto err2;
2255 }
2256 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2257 if (old_rule)
2258 list_add_rcu(&rule->list, &old_rule->list);
2259 else
2260 list_add_tail_rcu(&rule->list, &chain->rules);
2261 else {
2262 if (old_rule)
2263 list_add_tail_rcu(&rule->list, &old_rule->list);
2264 else
2265 list_add_rcu(&rule->list, &chain->rules);
2266 }
2267
2268 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2269 err = -ENOMEM;
2270 goto err3;
2271 }
2272 chain->use++;
2273 return 0;
2274
2275 err3:
2276 list_del_rcu(&rule->list);
2277 err2:
2278 nf_tables_rule_destroy(&ctx, rule);
2279 err1:
2280 for (i = 0; i < n; i++) {
2281 if (info[i].ops != NULL)
2282 module_put(info[i].ops->type->owner);
2283 }
2284 return err;
2285 }
2286
2287 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2288 const struct nlattr *nla)
2289 {
2290 u32 id = ntohl(nla_get_be32(nla));
2291 struct nft_trans *trans;
2292
2293 list_for_each_entry(trans, &net->nft.commit_list, list) {
2294 struct nft_rule *rule = nft_trans_rule(trans);
2295
2296 if (trans->msg_type == NFT_MSG_NEWRULE &&
2297 id == nft_trans_rule_id(trans))
2298 return rule;
2299 }
2300 return ERR_PTR(-ENOENT);
2301 }
2302
2303 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2304 struct sk_buff *skb, const struct nlmsghdr *nlh,
2305 const struct nlattr * const nla[])
2306 {
2307 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2308 u8 genmask = nft_genmask_next(net);
2309 struct nft_af_info *afi;
2310 struct nft_table *table;
2311 struct nft_chain *chain = NULL;
2312 struct nft_rule *rule;
2313 int family = nfmsg->nfgen_family, err = 0;
2314 struct nft_ctx ctx;
2315
2316 afi = nf_tables_afinfo_lookup(net, family, false);
2317 if (IS_ERR(afi))
2318 return PTR_ERR(afi);
2319
2320 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2321 if (IS_ERR(table))
2322 return PTR_ERR(table);
2323
2324 if (nla[NFTA_RULE_CHAIN]) {
2325 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2326 genmask);
2327 if (IS_ERR(chain))
2328 return PTR_ERR(chain);
2329 }
2330
2331 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2332
2333 if (chain) {
2334 if (nla[NFTA_RULE_HANDLE]) {
2335 rule = nf_tables_rule_lookup(chain,
2336 nla[NFTA_RULE_HANDLE]);
2337 if (IS_ERR(rule))
2338 return PTR_ERR(rule);
2339
2340 err = nft_delrule(&ctx, rule);
2341 } else if (nla[NFTA_RULE_ID]) {
2342 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2343 if (IS_ERR(rule))
2344 return PTR_ERR(rule);
2345
2346 err = nft_delrule(&ctx, rule);
2347 } else {
2348 err = nft_delrule_by_chain(&ctx);
2349 }
2350 } else {
2351 list_for_each_entry(chain, &table->chains, list) {
2352 if (!nft_is_active_next(net, chain))
2353 continue;
2354
2355 ctx.chain = chain;
2356 err = nft_delrule_by_chain(&ctx);
2357 if (err < 0)
2358 break;
2359 }
2360 }
2361
2362 return err;
2363 }
2364
2365 /*
2366 * Sets
2367 */
2368
2369 static LIST_HEAD(nf_tables_set_ops);
2370
2371 int nft_register_set(struct nft_set_ops *ops)
2372 {
2373 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2374 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2375 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2376 return 0;
2377 }
2378 EXPORT_SYMBOL_GPL(nft_register_set);
2379
2380 void nft_unregister_set(struct nft_set_ops *ops)
2381 {
2382 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2383 list_del_rcu(&ops->list);
2384 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2385 }
2386 EXPORT_SYMBOL_GPL(nft_unregister_set);
2387
2388 /*
2389 * Select a set implementation based on the data characteristics and the
2390 * given policy. The total memory use might not be known if no size is
2391 * given, in that case the amount of memory per element is used.
2392 */
2393 static const struct nft_set_ops *
2394 nft_select_set_ops(const struct nlattr * const nla[],
2395 const struct nft_set_desc *desc,
2396 enum nft_set_policies policy)
2397 {
2398 const struct nft_set_ops *ops, *bops;
2399 struct nft_set_estimate est, best;
2400 u32 features;
2401
2402 #ifdef CONFIG_MODULES
2403 if (list_empty(&nf_tables_set_ops)) {
2404 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2405 request_module("nft-set");
2406 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2407 if (!list_empty(&nf_tables_set_ops))
2408 return ERR_PTR(-EAGAIN);
2409 }
2410 #endif
2411 features = 0;
2412 if (nla[NFTA_SET_FLAGS] != NULL) {
2413 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2414 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT |
2415 NFT_SET_OBJECT;
2416 }
2417
2418 bops = NULL;
2419 best.size = ~0;
2420 best.lookup = ~0;
2421 best.space = ~0;
2422
2423 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2424 if ((ops->features & features) != features)
2425 continue;
2426 if (!ops->estimate(desc, features, &est))
2427 continue;
2428
2429 switch (policy) {
2430 case NFT_SET_POL_PERFORMANCE:
2431 if (est.lookup < best.lookup)
2432 break;
2433 if (est.lookup == best.lookup) {
2434 if (!desc->size) {
2435 if (est.space < best.space)
2436 break;
2437 } else if (est.size < best.size) {
2438 break;
2439 }
2440 }
2441 continue;
2442 case NFT_SET_POL_MEMORY:
2443 if (!desc->size) {
2444 if (est.space < best.space)
2445 break;
2446 if (est.space == best.space &&
2447 est.lookup < best.lookup)
2448 break;
2449 } else if (est.size < best.size) {
2450 break;
2451 }
2452 continue;
2453 default:
2454 break;
2455 }
2456
2457 if (!try_module_get(ops->owner))
2458 continue;
2459 if (bops != NULL)
2460 module_put(bops->owner);
2461
2462 bops = ops;
2463 best = est;
2464 }
2465
2466 if (bops != NULL)
2467 return bops;
2468
2469 return ERR_PTR(-EOPNOTSUPP);
2470 }
2471
2472 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2473 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2474 .len = NFT_TABLE_MAXNAMELEN - 1 },
2475 [NFTA_SET_NAME] = { .type = NLA_STRING,
2476 .len = NFT_SET_MAXNAMELEN - 1 },
2477 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2478 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2479 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2480 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2481 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2482 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2483 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2484 [NFTA_SET_ID] = { .type = NLA_U32 },
2485 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2486 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2487 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2488 .len = NFT_USERDATA_MAXLEN },
2489 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
2490 };
2491
2492 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2493 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2494 };
2495
2496 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2497 const struct sk_buff *skb,
2498 const struct nlmsghdr *nlh,
2499 const struct nlattr * const nla[],
2500 u8 genmask)
2501 {
2502 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2503 struct nft_af_info *afi = NULL;
2504 struct nft_table *table = NULL;
2505
2506 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2507 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2508 if (IS_ERR(afi))
2509 return PTR_ERR(afi);
2510 }
2511
2512 if (nla[NFTA_SET_TABLE] != NULL) {
2513 if (afi == NULL)
2514 return -EAFNOSUPPORT;
2515
2516 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2517 genmask);
2518 if (IS_ERR(table))
2519 return PTR_ERR(table);
2520 }
2521
2522 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
2523 return 0;
2524 }
2525
2526 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2527 const struct nlattr *nla, u8 genmask)
2528 {
2529 struct nft_set *set;
2530
2531 if (nla == NULL)
2532 return ERR_PTR(-EINVAL);
2533
2534 list_for_each_entry(set, &table->sets, list) {
2535 if (!nla_strcmp(nla, set->name) &&
2536 nft_active_genmask(set, genmask))
2537 return set;
2538 }
2539 return ERR_PTR(-ENOENT);
2540 }
2541 EXPORT_SYMBOL_GPL(nf_tables_set_lookup);
2542
2543 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2544 const struct nlattr *nla,
2545 u8 genmask)
2546 {
2547 struct nft_trans *trans;
2548 u32 id = ntohl(nla_get_be32(nla));
2549
2550 list_for_each_entry(trans, &net->nft.commit_list, list) {
2551 struct nft_set *set = nft_trans_set(trans);
2552
2553 if (trans->msg_type == NFT_MSG_NEWSET &&
2554 id == nft_trans_set_id(trans) &&
2555 nft_active_genmask(set, genmask))
2556 return set;
2557 }
2558 return ERR_PTR(-ENOENT);
2559 }
2560 EXPORT_SYMBOL_GPL(nf_tables_set_lookup_byid);
2561
2562 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2563 const char *name)
2564 {
2565 const struct nft_set *i;
2566 const char *p;
2567 unsigned long *inuse;
2568 unsigned int n = 0, min = 0;
2569
2570 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
2571 if (p != NULL) {
2572 if (p[1] != 'd' || strchr(p + 2, '%'))
2573 return -EINVAL;
2574
2575 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2576 if (inuse == NULL)
2577 return -ENOMEM;
2578 cont:
2579 list_for_each_entry(i, &ctx->table->sets, list) {
2580 int tmp;
2581
2582 if (!nft_is_active_next(ctx->net, set))
2583 continue;
2584 if (!sscanf(i->name, name, &tmp))
2585 continue;
2586 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2587 continue;
2588
2589 set_bit(tmp - min, inuse);
2590 }
2591
2592 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2593 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2594 min += BITS_PER_BYTE * PAGE_SIZE;
2595 memset(inuse, 0, PAGE_SIZE);
2596 goto cont;
2597 }
2598 free_page((unsigned long)inuse);
2599 }
2600
2601 snprintf(set->name, sizeof(set->name), name, min + n);
2602 list_for_each_entry(i, &ctx->table->sets, list) {
2603 if (!nft_is_active_next(ctx->net, i))
2604 continue;
2605 if (!strcmp(set->name, i->name))
2606 return -ENFILE;
2607 }
2608 return 0;
2609 }
2610
2611 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2612 const struct nft_set *set, u16 event, u16 flags)
2613 {
2614 struct nfgenmsg *nfmsg;
2615 struct nlmsghdr *nlh;
2616 struct nlattr *desc;
2617 u32 portid = ctx->portid;
2618 u32 seq = ctx->seq;
2619
2620 event |= NFNL_SUBSYS_NFTABLES << 8;
2621 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2622 flags);
2623 if (nlh == NULL)
2624 goto nla_put_failure;
2625
2626 nfmsg = nlmsg_data(nlh);
2627 nfmsg->nfgen_family = ctx->afi->family;
2628 nfmsg->version = NFNETLINK_V0;
2629 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2630
2631 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2632 goto nla_put_failure;
2633 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2634 goto nla_put_failure;
2635 if (set->flags != 0)
2636 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2637 goto nla_put_failure;
2638
2639 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2640 goto nla_put_failure;
2641 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2642 goto nla_put_failure;
2643 if (set->flags & NFT_SET_MAP) {
2644 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2645 goto nla_put_failure;
2646 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2647 goto nla_put_failure;
2648 }
2649 if (set->flags & NFT_SET_OBJECT &&
2650 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
2651 goto nla_put_failure;
2652
2653 if (set->timeout &&
2654 nla_put_be64(skb, NFTA_SET_TIMEOUT,
2655 cpu_to_be64(jiffies_to_msecs(set->timeout)),
2656 NFTA_SET_PAD))
2657 goto nla_put_failure;
2658 if (set->gc_int &&
2659 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2660 goto nla_put_failure;
2661
2662 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2663 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2664 goto nla_put_failure;
2665 }
2666
2667 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2668 goto nla_put_failure;
2669
2670 desc = nla_nest_start(skb, NFTA_SET_DESC);
2671 if (desc == NULL)
2672 goto nla_put_failure;
2673 if (set->size &&
2674 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2675 goto nla_put_failure;
2676 nla_nest_end(skb, desc);
2677
2678 nlmsg_end(skb, nlh);
2679 return 0;
2680
2681 nla_put_failure:
2682 nlmsg_trim(skb, nlh);
2683 return -1;
2684 }
2685
2686 static void nf_tables_set_notify(const struct nft_ctx *ctx,
2687 const struct nft_set *set, int event,
2688 gfp_t gfp_flags)
2689 {
2690 struct sk_buff *skb;
2691 u32 portid = ctx->portid;
2692 int err;
2693
2694 if (!ctx->report &&
2695 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2696 return;
2697
2698 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2699 if (skb == NULL)
2700 goto err;
2701
2702 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2703 if (err < 0) {
2704 kfree_skb(skb);
2705 goto err;
2706 }
2707
2708 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
2709 gfp_flags);
2710 return;
2711 err:
2712 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
2713 }
2714
2715 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2716 {
2717 const struct nft_set *set;
2718 unsigned int idx, s_idx = cb->args[0];
2719 struct nft_af_info *afi;
2720 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2721 struct net *net = sock_net(skb->sk);
2722 int cur_family = cb->args[3];
2723 struct nft_ctx *ctx = cb->data, ctx_set;
2724
2725 if (cb->args[1])
2726 return skb->len;
2727
2728 rcu_read_lock();
2729 cb->seq = net->nft.base_seq;
2730
2731 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2732 if (ctx->afi && ctx->afi != afi)
2733 continue;
2734
2735 if (cur_family) {
2736 if (afi->family != cur_family)
2737 continue;
2738
2739 cur_family = 0;
2740 }
2741 list_for_each_entry_rcu(table, &afi->tables, list) {
2742 if (ctx->table && ctx->table != table)
2743 continue;
2744
2745 if (cur_table) {
2746 if (cur_table != table)
2747 continue;
2748
2749 cur_table = NULL;
2750 }
2751 idx = 0;
2752 list_for_each_entry_rcu(set, &table->sets, list) {
2753 if (idx < s_idx)
2754 goto cont;
2755 if (!nft_is_active(net, set))
2756 goto cont;
2757
2758 ctx_set = *ctx;
2759 ctx_set.table = table;
2760 ctx_set.afi = afi;
2761 if (nf_tables_fill_set(skb, &ctx_set, set,
2762 NFT_MSG_NEWSET,
2763 NLM_F_MULTI) < 0) {
2764 cb->args[0] = idx;
2765 cb->args[2] = (unsigned long) table;
2766 cb->args[3] = afi->family;
2767 goto done;
2768 }
2769 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2770 cont:
2771 idx++;
2772 }
2773 if (s_idx)
2774 s_idx = 0;
2775 }
2776 }
2777 cb->args[1] = 1;
2778 done:
2779 rcu_read_unlock();
2780 return skb->len;
2781 }
2782
2783 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2784 {
2785 kfree(cb->data);
2786 return 0;
2787 }
2788
2789 static int nf_tables_getset(struct net *net, struct sock *nlsk,
2790 struct sk_buff *skb, const struct nlmsghdr *nlh,
2791 const struct nlattr * const nla[])
2792 {
2793 u8 genmask = nft_genmask_cur(net);
2794 const struct nft_set *set;
2795 struct nft_ctx ctx;
2796 struct sk_buff *skb2;
2797 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2798 int err;
2799
2800 /* Verify existence before starting dump */
2801 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
2802 if (err < 0)
2803 return err;
2804
2805 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2806 struct netlink_dump_control c = {
2807 .dump = nf_tables_dump_sets,
2808 .done = nf_tables_dump_sets_done,
2809 };
2810 struct nft_ctx *ctx_dump;
2811
2812 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2813 if (ctx_dump == NULL)
2814 return -ENOMEM;
2815
2816 *ctx_dump = ctx;
2817 c.data = ctx_dump;
2818
2819 return netlink_dump_start(nlsk, skb, nlh, &c);
2820 }
2821
2822 /* Only accept unspec with dump */
2823 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2824 return -EAFNOSUPPORT;
2825 if (!nla[NFTA_SET_TABLE])
2826 return -EINVAL;
2827
2828 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
2829 if (IS_ERR(set))
2830 return PTR_ERR(set);
2831
2832 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2833 if (skb2 == NULL)
2834 return -ENOMEM;
2835
2836 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2837 if (err < 0)
2838 goto err;
2839
2840 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2841
2842 err:
2843 kfree_skb(skb2);
2844 return err;
2845 }
2846
2847 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2848 struct nft_set_desc *desc,
2849 const struct nlattr *nla)
2850 {
2851 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2852 int err;
2853
2854 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2855 if (err < 0)
2856 return err;
2857
2858 if (da[NFTA_SET_DESC_SIZE] != NULL)
2859 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2860
2861 return 0;
2862 }
2863
2864 static int nf_tables_newset(struct net *net, struct sock *nlsk,
2865 struct sk_buff *skb, const struct nlmsghdr *nlh,
2866 const struct nlattr * const nla[])
2867 {
2868 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2869 u8 genmask = nft_genmask_next(net);
2870 const struct nft_set_ops *ops;
2871 struct nft_af_info *afi;
2872 struct nft_table *table;
2873 struct nft_set *set;
2874 struct nft_ctx ctx;
2875 char name[NFT_SET_MAXNAMELEN];
2876 unsigned int size;
2877 bool create;
2878 u64 timeout;
2879 u32 ktype, dtype, flags, policy, gc_int, objtype;
2880 struct nft_set_desc desc;
2881 unsigned char *udata;
2882 u16 udlen;
2883 int err;
2884
2885 if (nla[NFTA_SET_TABLE] == NULL ||
2886 nla[NFTA_SET_NAME] == NULL ||
2887 nla[NFTA_SET_KEY_LEN] == NULL ||
2888 nla[NFTA_SET_ID] == NULL)
2889 return -EINVAL;
2890
2891 memset(&desc, 0, sizeof(desc));
2892
2893 ktype = NFT_DATA_VALUE;
2894 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2895 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2896 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2897 return -EINVAL;
2898 }
2899
2900 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2901 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
2902 return -EINVAL;
2903
2904 flags = 0;
2905 if (nla[NFTA_SET_FLAGS] != NULL) {
2906 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2907 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2908 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2909 NFT_SET_MAP | NFT_SET_EVAL |
2910 NFT_SET_OBJECT))
2911 return -EINVAL;
2912 /* Only one of these operations is supported */
2913 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
2914 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
2915 return -EOPNOTSUPP;
2916 }
2917
2918 dtype = 0;
2919 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2920 if (!(flags & NFT_SET_MAP))
2921 return -EINVAL;
2922
2923 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2924 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2925 dtype != NFT_DATA_VERDICT)
2926 return -EINVAL;
2927
2928 if (dtype != NFT_DATA_VERDICT) {
2929 if (nla[NFTA_SET_DATA_LEN] == NULL)
2930 return -EINVAL;
2931 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2932 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
2933 return -EINVAL;
2934 } else
2935 desc.dlen = sizeof(struct nft_verdict);
2936 } else if (flags & NFT_SET_MAP)
2937 return -EINVAL;
2938
2939 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
2940 if (!(flags & NFT_SET_OBJECT))
2941 return -EINVAL;
2942
2943 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
2944 if (objtype == NFT_OBJECT_UNSPEC ||
2945 objtype > NFT_OBJECT_MAX)
2946 return -EINVAL;
2947 } else if (flags & NFT_SET_OBJECT)
2948 return -EINVAL;
2949 else
2950 objtype = NFT_OBJECT_UNSPEC;
2951
2952 timeout = 0;
2953 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2954 if (!(flags & NFT_SET_TIMEOUT))
2955 return -EINVAL;
2956 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
2957 nla[NFTA_SET_TIMEOUT])));
2958 }
2959 gc_int = 0;
2960 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2961 if (!(flags & NFT_SET_TIMEOUT))
2962 return -EINVAL;
2963 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2964 }
2965
2966 policy = NFT_SET_POL_PERFORMANCE;
2967 if (nla[NFTA_SET_POLICY] != NULL)
2968 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2969
2970 if (nla[NFTA_SET_DESC] != NULL) {
2971 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2972 if (err < 0)
2973 return err;
2974 }
2975
2976 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2977
2978 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2979 if (IS_ERR(afi))
2980 return PTR_ERR(afi);
2981
2982 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
2983 if (IS_ERR(table))
2984 return PTR_ERR(table);
2985
2986 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
2987
2988 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
2989 if (IS_ERR(set)) {
2990 if (PTR_ERR(set) != -ENOENT)
2991 return PTR_ERR(set);
2992 } else {
2993 if (nlh->nlmsg_flags & NLM_F_EXCL)
2994 return -EEXIST;
2995 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2996 return -EOPNOTSUPP;
2997 return 0;
2998 }
2999
3000 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3001 return -ENOENT;
3002
3003 ops = nft_select_set_ops(nla, &desc, policy);
3004 if (IS_ERR(ops))
3005 return PTR_ERR(ops);
3006
3007 udlen = 0;
3008 if (nla[NFTA_SET_USERDATA])
3009 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3010
3011 size = 0;
3012 if (ops->privsize != NULL)
3013 size = ops->privsize(nla);
3014
3015 err = -ENOMEM;
3016 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3017 if (set == NULL)
3018 goto err1;
3019
3020 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
3021 err = nf_tables_set_alloc_name(&ctx, set, name);
3022 if (err < 0)
3023 goto err2;
3024
3025 udata = NULL;
3026 if (udlen) {
3027 udata = set->data + size;
3028 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3029 }
3030
3031 INIT_LIST_HEAD(&set->bindings);
3032 set->ops = ops;
3033 set->ktype = ktype;
3034 set->klen = desc.klen;
3035 set->dtype = dtype;
3036 set->objtype = objtype;
3037 set->dlen = desc.dlen;
3038 set->flags = flags;
3039 set->size = desc.size;
3040 set->policy = policy;
3041 set->udlen = udlen;
3042 set->udata = udata;
3043 set->timeout = timeout;
3044 set->gc_int = gc_int;
3045
3046 err = ops->init(set, &desc, nla);
3047 if (err < 0)
3048 goto err2;
3049
3050 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3051 if (err < 0)
3052 goto err3;
3053
3054 list_add_tail_rcu(&set->list, &table->sets);
3055 table->use++;
3056 return 0;
3057
3058 err3:
3059 ops->destroy(set);
3060 err2:
3061 kfree(set);
3062 err1:
3063 module_put(ops->owner);
3064 return err;
3065 }
3066
3067 static void nft_set_destroy(struct nft_set *set)
3068 {
3069 set->ops->destroy(set);
3070 module_put(set->ops->owner);
3071 kfree(set);
3072 }
3073
3074 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3075 {
3076 list_del_rcu(&set->list);
3077 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
3078 nft_set_destroy(set);
3079 }
3080
3081 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3082 struct sk_buff *skb, const struct nlmsghdr *nlh,
3083 const struct nlattr * const nla[])
3084 {
3085 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3086 u8 genmask = nft_genmask_next(net);
3087 struct nft_set *set;
3088 struct nft_ctx ctx;
3089 int err;
3090
3091 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3092 return -EAFNOSUPPORT;
3093 if (nla[NFTA_SET_TABLE] == NULL)
3094 return -EINVAL;
3095
3096 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
3097 if (err < 0)
3098 return err;
3099
3100 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3101 if (IS_ERR(set))
3102 return PTR_ERR(set);
3103 if (!list_empty(&set->bindings))
3104 return -EBUSY;
3105
3106 return nft_delset(&ctx, set);
3107 }
3108
3109 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3110 struct nft_set *set,
3111 const struct nft_set_iter *iter,
3112 struct nft_set_elem *elem)
3113 {
3114 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3115 enum nft_registers dreg;
3116
3117 dreg = nft_type_to_reg(set->dtype);
3118 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3119 set->dtype == NFT_DATA_VERDICT ?
3120 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3121 set->dlen);
3122 }
3123
3124 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3125 struct nft_set_binding *binding)
3126 {
3127 struct nft_set_binding *i;
3128 struct nft_set_iter iter;
3129
3130 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
3131 return -EBUSY;
3132
3133 if (binding->flags & NFT_SET_MAP) {
3134 /* If the set is already bound to the same chain all
3135 * jumps are already validated for that chain.
3136 */
3137 list_for_each_entry(i, &set->bindings, list) {
3138 if (i->flags & NFT_SET_MAP &&
3139 i->chain == binding->chain)
3140 goto bind;
3141 }
3142
3143 iter.genmask = nft_genmask_next(ctx->net);
3144 iter.skip = 0;
3145 iter.count = 0;
3146 iter.err = 0;
3147 iter.fn = nf_tables_bind_check_setelem;
3148
3149 set->ops->walk(ctx, set, &iter);
3150 if (iter.err < 0)
3151 return iter.err;
3152 }
3153 bind:
3154 binding->chain = ctx->chain;
3155 list_add_tail_rcu(&binding->list, &set->bindings);
3156 return 0;
3157 }
3158 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3159
3160 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3161 struct nft_set_binding *binding)
3162 {
3163 list_del_rcu(&binding->list);
3164
3165 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
3166 nft_is_active(ctx->net, set))
3167 nf_tables_set_destroy(ctx, set);
3168 }
3169 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3170
3171 const struct nft_set_ext_type nft_set_ext_types[] = {
3172 [NFT_SET_EXT_KEY] = {
3173 .align = __alignof__(u32),
3174 },
3175 [NFT_SET_EXT_DATA] = {
3176 .align = __alignof__(u32),
3177 },
3178 [NFT_SET_EXT_EXPR] = {
3179 .align = __alignof__(struct nft_expr),
3180 },
3181 [NFT_SET_EXT_OBJREF] = {
3182 .len = sizeof(struct nft_object *),
3183 .align = __alignof__(struct nft_object *),
3184 },
3185 [NFT_SET_EXT_FLAGS] = {
3186 .len = sizeof(u8),
3187 .align = __alignof__(u8),
3188 },
3189 [NFT_SET_EXT_TIMEOUT] = {
3190 .len = sizeof(u64),
3191 .align = __alignof__(u64),
3192 },
3193 [NFT_SET_EXT_EXPIRATION] = {
3194 .len = sizeof(unsigned long),
3195 .align = __alignof__(unsigned long),
3196 },
3197 [NFT_SET_EXT_USERDATA] = {
3198 .len = sizeof(struct nft_userdata),
3199 .align = __alignof__(struct nft_userdata),
3200 },
3201 };
3202 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3203
3204 /*
3205 * Set elements
3206 */
3207
3208 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3209 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3210 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3211 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3212 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3213 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3214 .len = NFT_USERDATA_MAXLEN },
3215 };
3216
3217 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3218 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3219 .len = NFT_TABLE_MAXNAMELEN - 1 },
3220 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3221 .len = NFT_SET_MAXNAMELEN - 1 },
3222 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3223 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3224 };
3225
3226 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3227 const struct sk_buff *skb,
3228 const struct nlmsghdr *nlh,
3229 const struct nlattr * const nla[],
3230 u8 genmask)
3231 {
3232 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3233 struct nft_af_info *afi;
3234 struct nft_table *table;
3235
3236 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3237 if (IS_ERR(afi))
3238 return PTR_ERR(afi);
3239
3240 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3241 genmask);
3242 if (IS_ERR(table))
3243 return PTR_ERR(table);
3244
3245 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
3246 return 0;
3247 }
3248
3249 static int nf_tables_fill_setelem(struct sk_buff *skb,
3250 const struct nft_set *set,
3251 const struct nft_set_elem *elem)
3252 {
3253 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3254 unsigned char *b = skb_tail_pointer(skb);
3255 struct nlattr *nest;
3256
3257 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3258 if (nest == NULL)
3259 goto nla_put_failure;
3260
3261 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3262 NFT_DATA_VALUE, set->klen) < 0)
3263 goto nla_put_failure;
3264
3265 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3266 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3267 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3268 set->dlen) < 0)
3269 goto nla_put_failure;
3270
3271 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3272 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3273 goto nla_put_failure;
3274
3275 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3276 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3277 (*nft_set_ext_obj(ext))->name) < 0)
3278 goto nla_put_failure;
3279
3280 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3281 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3282 htonl(*nft_set_ext_flags(ext))))
3283 goto nla_put_failure;
3284
3285 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3286 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3287 cpu_to_be64(jiffies_to_msecs(
3288 *nft_set_ext_timeout(ext))),
3289 NFTA_SET_ELEM_PAD))
3290 goto nla_put_failure;
3291
3292 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3293 unsigned long expires, now = jiffies;
3294
3295 expires = *nft_set_ext_expiration(ext);
3296 if (time_before(now, expires))
3297 expires -= now;
3298 else
3299 expires = 0;
3300
3301 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3302 cpu_to_be64(jiffies_to_msecs(expires)),
3303 NFTA_SET_ELEM_PAD))
3304 goto nla_put_failure;
3305 }
3306
3307 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3308 struct nft_userdata *udata;
3309
3310 udata = nft_set_ext_userdata(ext);
3311 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3312 udata->len + 1, udata->data))
3313 goto nla_put_failure;
3314 }
3315
3316 nla_nest_end(skb, nest);
3317 return 0;
3318
3319 nla_put_failure:
3320 nlmsg_trim(skb, b);
3321 return -EMSGSIZE;
3322 }
3323
3324 struct nft_set_dump_args {
3325 const struct netlink_callback *cb;
3326 struct nft_set_iter iter;
3327 struct sk_buff *skb;
3328 };
3329
3330 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3331 struct nft_set *set,
3332 const struct nft_set_iter *iter,
3333 struct nft_set_elem *elem)
3334 {
3335 struct nft_set_dump_args *args;
3336
3337 args = container_of(iter, struct nft_set_dump_args, iter);
3338 return nf_tables_fill_setelem(args->skb, set, elem);
3339 }
3340
3341 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3342 {
3343 struct net *net = sock_net(skb->sk);
3344 u8 genmask = nft_genmask_cur(net);
3345 struct nft_set *set;
3346 struct nft_set_dump_args args;
3347 struct nft_ctx ctx;
3348 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3349 struct nfgenmsg *nfmsg;
3350 struct nlmsghdr *nlh;
3351 struct nlattr *nest;
3352 u32 portid, seq;
3353 int event, err;
3354
3355 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3356 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
3357 if (err < 0)
3358 return err;
3359
3360 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
3361 (void *)nla, genmask);
3362 if (err < 0)
3363 return err;
3364
3365 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3366 genmask);
3367 if (IS_ERR(set))
3368 return PTR_ERR(set);
3369
3370 event = NFT_MSG_NEWSETELEM;
3371 event |= NFNL_SUBSYS_NFTABLES << 8;
3372 portid = NETLINK_CB(cb->skb).portid;
3373 seq = cb->nlh->nlmsg_seq;
3374
3375 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3376 NLM_F_MULTI);
3377 if (nlh == NULL)
3378 goto nla_put_failure;
3379
3380 nfmsg = nlmsg_data(nlh);
3381 nfmsg->nfgen_family = ctx.afi->family;
3382 nfmsg->version = NFNETLINK_V0;
3383 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
3384
3385 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3386 goto nla_put_failure;
3387 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3388 goto nla_put_failure;
3389
3390 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3391 if (nest == NULL)
3392 goto nla_put_failure;
3393
3394 args.cb = cb;
3395 args.skb = skb;
3396 args.iter.genmask = nft_genmask_cur(ctx.net);
3397 args.iter.skip = cb->args[0];
3398 args.iter.count = 0;
3399 args.iter.err = 0;
3400 args.iter.fn = nf_tables_dump_setelem;
3401 set->ops->walk(&ctx, set, &args.iter);
3402
3403 nla_nest_end(skb, nest);
3404 nlmsg_end(skb, nlh);
3405
3406 if (args.iter.err && args.iter.err != -EMSGSIZE)
3407 return args.iter.err;
3408 if (args.iter.count == cb->args[0])
3409 return 0;
3410
3411 cb->args[0] = args.iter.count;
3412 return skb->len;
3413
3414 nla_put_failure:
3415 return -ENOSPC;
3416 }
3417
3418 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3419 struct sk_buff *skb, const struct nlmsghdr *nlh,
3420 const struct nlattr * const nla[])
3421 {
3422 u8 genmask = nft_genmask_cur(net);
3423 const struct nft_set *set;
3424 struct nft_ctx ctx;
3425 int err;
3426
3427 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3428 if (err < 0)
3429 return err;
3430
3431 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3432 genmask);
3433 if (IS_ERR(set))
3434 return PTR_ERR(set);
3435
3436 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3437 struct netlink_dump_control c = {
3438 .dump = nf_tables_dump_set,
3439 };
3440 return netlink_dump_start(nlsk, skb, nlh, &c);
3441 }
3442 return -EOPNOTSUPP;
3443 }
3444
3445 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3446 const struct nft_ctx *ctx, u32 seq,
3447 u32 portid, int event, u16 flags,
3448 const struct nft_set *set,
3449 const struct nft_set_elem *elem)
3450 {
3451 struct nfgenmsg *nfmsg;
3452 struct nlmsghdr *nlh;
3453 struct nlattr *nest;
3454 int err;
3455
3456 event |= NFNL_SUBSYS_NFTABLES << 8;
3457 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3458 flags);
3459 if (nlh == NULL)
3460 goto nla_put_failure;
3461
3462 nfmsg = nlmsg_data(nlh);
3463 nfmsg->nfgen_family = ctx->afi->family;
3464 nfmsg->version = NFNETLINK_V0;
3465 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3466
3467 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3468 goto nla_put_failure;
3469 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3470 goto nla_put_failure;
3471
3472 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3473 if (nest == NULL)
3474 goto nla_put_failure;
3475
3476 err = nf_tables_fill_setelem(skb, set, elem);
3477 if (err < 0)
3478 goto nla_put_failure;
3479
3480 nla_nest_end(skb, nest);
3481
3482 nlmsg_end(skb, nlh);
3483 return 0;
3484
3485 nla_put_failure:
3486 nlmsg_trim(skb, nlh);
3487 return -1;
3488 }
3489
3490 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
3491 const struct nft_set *set,
3492 const struct nft_set_elem *elem,
3493 int event, u16 flags)
3494 {
3495 struct net *net = ctx->net;
3496 u32 portid = ctx->portid;
3497 struct sk_buff *skb;
3498 int err;
3499
3500 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3501 return;
3502
3503 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3504 if (skb == NULL)
3505 goto err;
3506
3507 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3508 set, elem);
3509 if (err < 0) {
3510 kfree_skb(skb);
3511 goto err;
3512 }
3513
3514 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3515 GFP_KERNEL);
3516 return;
3517 err:
3518 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3519 }
3520
3521 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3522 int msg_type,
3523 struct nft_set *set)
3524 {
3525 struct nft_trans *trans;
3526
3527 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3528 if (trans == NULL)
3529 return NULL;
3530
3531 nft_trans_elem_set(trans) = set;
3532 return trans;
3533 }
3534
3535 void *nft_set_elem_init(const struct nft_set *set,
3536 const struct nft_set_ext_tmpl *tmpl,
3537 const u32 *key, const u32 *data,
3538 u64 timeout, gfp_t gfp)
3539 {
3540 struct nft_set_ext *ext;
3541 void *elem;
3542
3543 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3544 if (elem == NULL)
3545 return NULL;
3546
3547 ext = nft_set_elem_ext(set, elem);
3548 nft_set_ext_init(ext, tmpl);
3549
3550 memcpy(nft_set_ext_key(ext), key, set->klen);
3551 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3552 memcpy(nft_set_ext_data(ext), data, set->dlen);
3553 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3554 *nft_set_ext_expiration(ext) =
3555 jiffies + timeout;
3556 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3557 *nft_set_ext_timeout(ext) = timeout;
3558
3559 return elem;
3560 }
3561
3562 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
3563 bool destroy_expr)
3564 {
3565 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3566
3567 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3568 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3569 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
3570 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3571 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3572 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
3573 (*nft_set_ext_obj(ext))->use--;
3574 kfree(elem);
3575 }
3576 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3577
3578 static int nft_setelem_parse_flags(const struct nft_set *set,
3579 const struct nlattr *attr, u32 *flags)
3580 {
3581 if (attr == NULL)
3582 return 0;
3583
3584 *flags = ntohl(nla_get_be32(attr));
3585 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3586 return -EINVAL;
3587 if (!(set->flags & NFT_SET_INTERVAL) &&
3588 *flags & NFT_SET_ELEM_INTERVAL_END)
3589 return -EINVAL;
3590
3591 return 0;
3592 }
3593
3594 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3595 const struct nlattr *attr, u32 nlmsg_flags)
3596 {
3597 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3598 u8 genmask = nft_genmask_next(ctx->net);
3599 struct nft_data_desc d1, d2;
3600 struct nft_set_ext_tmpl tmpl;
3601 struct nft_set_ext *ext, *ext2;
3602 struct nft_set_elem elem;
3603 struct nft_set_binding *binding;
3604 struct nft_object *obj = NULL;
3605 struct nft_userdata *udata;
3606 struct nft_data data;
3607 enum nft_registers dreg;
3608 struct nft_trans *trans;
3609 u32 flags = 0;
3610 u64 timeout;
3611 u8 ulen;
3612 int err;
3613
3614 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3615 nft_set_elem_policy);
3616 if (err < 0)
3617 return err;
3618
3619 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3620 return -EINVAL;
3621
3622 nft_set_ext_prepare(&tmpl);
3623
3624 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3625 if (err < 0)
3626 return err;
3627 if (flags != 0)
3628 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3629
3630 if (set->flags & NFT_SET_MAP) {
3631 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3632 !(flags & NFT_SET_ELEM_INTERVAL_END))
3633 return -EINVAL;
3634 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3635 flags & NFT_SET_ELEM_INTERVAL_END)
3636 return -EINVAL;
3637 } else {
3638 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3639 return -EINVAL;
3640 }
3641
3642 timeout = 0;
3643 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3644 if (!(set->flags & NFT_SET_TIMEOUT))
3645 return -EINVAL;
3646 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3647 nla[NFTA_SET_ELEM_TIMEOUT])));
3648 } else if (set->flags & NFT_SET_TIMEOUT) {
3649 timeout = set->timeout;
3650 }
3651
3652 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3653 nla[NFTA_SET_ELEM_KEY]);
3654 if (err < 0)
3655 goto err1;
3656 err = -EINVAL;
3657 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3658 goto err2;
3659
3660 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3661 if (timeout > 0) {
3662 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3663 if (timeout != set->timeout)
3664 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3665 }
3666
3667 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
3668 if (!(set->flags & NFT_SET_OBJECT)) {
3669 err = -EINVAL;
3670 goto err2;
3671 }
3672 obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
3673 set->objtype, genmask);
3674 if (IS_ERR(obj)) {
3675 err = PTR_ERR(obj);
3676 goto err2;
3677 }
3678 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
3679 }
3680
3681 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3682 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3683 nla[NFTA_SET_ELEM_DATA]);
3684 if (err < 0)
3685 goto err2;
3686
3687 err = -EINVAL;
3688 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3689 goto err3;
3690
3691 dreg = nft_type_to_reg(set->dtype);
3692 list_for_each_entry(binding, &set->bindings, list) {
3693 struct nft_ctx bind_ctx = {
3694 .net = ctx->net,
3695 .afi = ctx->afi,
3696 .table = ctx->table,
3697 .chain = (struct nft_chain *)binding->chain,
3698 };
3699
3700 if (!(binding->flags & NFT_SET_MAP))
3701 continue;
3702
3703 err = nft_validate_register_store(&bind_ctx, dreg,
3704 &data,
3705 d2.type, d2.len);
3706 if (err < 0)
3707 goto err3;
3708 }
3709
3710 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
3711 }
3712
3713 /* The full maximum length of userdata can exceed the maximum
3714 * offset value (U8_MAX) for following extensions, therefor it
3715 * must be the last extension added.
3716 */
3717 ulen = 0;
3718 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3719 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3720 if (ulen > 0)
3721 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3722 ulen);
3723 }
3724
3725 err = -ENOMEM;
3726 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
3727 timeout, GFP_KERNEL);
3728 if (elem.priv == NULL)
3729 goto err3;
3730
3731 ext = nft_set_elem_ext(set, elem.priv);
3732 if (flags)
3733 *nft_set_ext_flags(ext) = flags;
3734 if (ulen > 0) {
3735 udata = nft_set_ext_userdata(ext);
3736 udata->len = ulen - 1;
3737 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3738 }
3739 if (obj) {
3740 *nft_set_ext_obj(ext) = obj;
3741 obj->use++;
3742 }
3743
3744 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3745 if (trans == NULL)
3746 goto err4;
3747
3748 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
3749 err = set->ops->insert(ctx->net, set, &elem, &ext2);
3750 if (err) {
3751 if (err == -EEXIST) {
3752 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3753 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
3754 memcmp(nft_set_ext_data(ext),
3755 nft_set_ext_data(ext2), set->dlen) != 0) ||
3756 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3757 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
3758 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
3759 err = -EBUSY;
3760 else if (!(nlmsg_flags & NLM_F_EXCL))
3761 err = 0;
3762 }
3763 goto err5;
3764 }
3765
3766 if (set->size &&
3767 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
3768 err = -ENFILE;
3769 goto err6;
3770 }
3771
3772 nft_trans_elem(trans) = elem;
3773 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3774 return 0;
3775
3776 err6:
3777 set->ops->remove(ctx->net, set, &elem);
3778 err5:
3779 kfree(trans);
3780 err4:
3781 kfree(elem.priv);
3782 err3:
3783 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3784 nft_data_uninit(&data, d2.type);
3785 err2:
3786 nft_data_uninit(&elem.key.val, d1.type);
3787 err1:
3788 return err;
3789 }
3790
3791 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3792 struct sk_buff *skb, const struct nlmsghdr *nlh,
3793 const struct nlattr * const nla[])
3794 {
3795 u8 genmask = nft_genmask_next(net);
3796 const struct nlattr *attr;
3797 struct nft_set *set;
3798 struct nft_ctx ctx;
3799 int rem, err = 0;
3800
3801 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3802 return -EINVAL;
3803
3804 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3805 if (err < 0)
3806 return err;
3807
3808 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3809 genmask);
3810 if (IS_ERR(set)) {
3811 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3812 set = nf_tables_set_lookup_byid(net,
3813 nla[NFTA_SET_ELEM_LIST_SET_ID],
3814 genmask);
3815 }
3816 if (IS_ERR(set))
3817 return PTR_ERR(set);
3818 }
3819
3820 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3821 return -EBUSY;
3822
3823 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3824 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
3825 if (err < 0)
3826 break;
3827 }
3828 return err;
3829 }
3830
3831 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3832 const struct nlattr *attr)
3833 {
3834 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3835 struct nft_set_ext_tmpl tmpl;
3836 struct nft_data_desc desc;
3837 struct nft_set_elem elem;
3838 struct nft_set_ext *ext;
3839 struct nft_trans *trans;
3840 u32 flags = 0;
3841 void *priv;
3842 int err;
3843
3844 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3845 nft_set_elem_policy);
3846 if (err < 0)
3847 goto err1;
3848
3849 err = -EINVAL;
3850 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3851 goto err1;
3852
3853 nft_set_ext_prepare(&tmpl);
3854
3855 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3856 if (err < 0)
3857 return err;
3858 if (flags != 0)
3859 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3860
3861 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3862 nla[NFTA_SET_ELEM_KEY]);
3863 if (err < 0)
3864 goto err1;
3865
3866 err = -EINVAL;
3867 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3868 goto err2;
3869
3870 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3871
3872 err = -ENOMEM;
3873 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3874 GFP_KERNEL);
3875 if (elem.priv == NULL)
3876 goto err2;
3877
3878 ext = nft_set_elem_ext(set, elem.priv);
3879 if (flags)
3880 *nft_set_ext_flags(ext) = flags;
3881
3882 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3883 if (trans == NULL) {
3884 err = -ENOMEM;
3885 goto err3;
3886 }
3887
3888 priv = set->ops->deactivate(ctx->net, set, &elem);
3889 if (priv == NULL) {
3890 err = -ENOENT;
3891 goto err4;
3892 }
3893 kfree(elem.priv);
3894 elem.priv = priv;
3895
3896 nft_trans_elem(trans) = elem;
3897 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3898 return 0;
3899
3900 err4:
3901 kfree(trans);
3902 err3:
3903 kfree(elem.priv);
3904 err2:
3905 nft_data_uninit(&elem.key.val, desc.type);
3906 err1:
3907 return err;
3908 }
3909
3910 static int nft_flush_set(const struct nft_ctx *ctx,
3911 struct nft_set *set,
3912 const struct nft_set_iter *iter,
3913 struct nft_set_elem *elem)
3914 {
3915 struct nft_trans *trans;
3916 int err;
3917
3918 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
3919 sizeof(struct nft_trans_elem), GFP_ATOMIC);
3920 if (!trans)
3921 return -ENOMEM;
3922
3923 if (!set->ops->flush(ctx->net, set, elem->priv)) {
3924 err = -ENOENT;
3925 goto err1;
3926 }
3927 set->ndeact++;
3928
3929 nft_trans_elem_set(trans) = set;
3930 nft_trans_elem(trans) = *elem;
3931 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3932
3933 return 0;
3934 err1:
3935 kfree(trans);
3936 return err;
3937 }
3938
3939 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3940 struct sk_buff *skb, const struct nlmsghdr *nlh,
3941 const struct nlattr * const nla[])
3942 {
3943 u8 genmask = nft_genmask_next(net);
3944 const struct nlattr *attr;
3945 struct nft_set *set;
3946 struct nft_ctx ctx;
3947 int rem, err = 0;
3948
3949 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3950 if (err < 0)
3951 return err;
3952
3953 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3954 genmask);
3955 if (IS_ERR(set))
3956 return PTR_ERR(set);
3957 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3958 return -EBUSY;
3959
3960 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
3961 struct nft_set_iter iter = {
3962 .genmask = genmask,
3963 .fn = nft_flush_set,
3964 };
3965 set->ops->walk(&ctx, set, &iter);
3966
3967 return iter.err;
3968 }
3969
3970 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3971 err = nft_del_setelem(&ctx, set, attr);
3972 if (err < 0)
3973 break;
3974
3975 set->ndeact++;
3976 }
3977 return err;
3978 }
3979
3980 void nft_set_gc_batch_release(struct rcu_head *rcu)
3981 {
3982 struct nft_set_gc_batch *gcb;
3983 unsigned int i;
3984
3985 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
3986 for (i = 0; i < gcb->head.cnt; i++)
3987 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
3988 kfree(gcb);
3989 }
3990 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
3991
3992 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
3993 gfp_t gfp)
3994 {
3995 struct nft_set_gc_batch *gcb;
3996
3997 gcb = kzalloc(sizeof(*gcb), gfp);
3998 if (gcb == NULL)
3999 return gcb;
4000 gcb->head.set = set;
4001 return gcb;
4002 }
4003 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4004
4005 /*
4006 * Stateful objects
4007 */
4008
4009 /**
4010 * nft_register_obj- register nf_tables stateful object type
4011 * @obj: object type
4012 *
4013 * Registers the object type for use with nf_tables. Returns zero on
4014 * success or a negative errno code otherwise.
4015 */
4016 int nft_register_obj(struct nft_object_type *obj_type)
4017 {
4018 if (obj_type->type == NFT_OBJECT_UNSPEC)
4019 return -EINVAL;
4020
4021 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4022 list_add_rcu(&obj_type->list, &nf_tables_objects);
4023 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4024 return 0;
4025 }
4026 EXPORT_SYMBOL_GPL(nft_register_obj);
4027
4028 /**
4029 * nft_unregister_obj - unregister nf_tables object type
4030 * @obj: object type
4031 *
4032 * Unregisters the object type for use with nf_tables.
4033 */
4034 void nft_unregister_obj(struct nft_object_type *obj_type)
4035 {
4036 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4037 list_del_rcu(&obj_type->list);
4038 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4039 }
4040 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4041
4042 struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
4043 const struct nlattr *nla,
4044 u32 objtype, u8 genmask)
4045 {
4046 struct nft_object *obj;
4047
4048 list_for_each_entry(obj, &table->objects, list) {
4049 if (!nla_strcmp(nla, obj->name) &&
4050 objtype == obj->type->type &&
4051 nft_active_genmask(obj, genmask))
4052 return obj;
4053 }
4054 return ERR_PTR(-ENOENT);
4055 }
4056 EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
4057
4058 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4059 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4060 .len = NFT_TABLE_MAXNAMELEN - 1 },
4061 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4062 .len = NFT_OBJ_MAXNAMELEN - 1 },
4063 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4064 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4065 };
4066
4067 static struct nft_object *nft_obj_init(const struct nft_object_type *type,
4068 const struct nlattr *attr)
4069 {
4070 struct nlattr *tb[type->maxattr + 1];
4071 struct nft_object *obj;
4072 int err;
4073
4074 if (attr) {
4075 err = nla_parse_nested(tb, type->maxattr, attr, type->policy);
4076 if (err < 0)
4077 goto err1;
4078 } else {
4079 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4080 }
4081
4082 err = -ENOMEM;
4083 obj = kzalloc(sizeof(struct nft_object) + type->size, GFP_KERNEL);
4084 if (obj == NULL)
4085 goto err1;
4086
4087 err = type->init((const struct nlattr * const *)tb, obj);
4088 if (err < 0)
4089 goto err2;
4090
4091 obj->type = type;
4092 return obj;
4093 err2:
4094 kfree(obj);
4095 err1:
4096 return ERR_PTR(err);
4097 }
4098
4099 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
4100 struct nft_object *obj, bool reset)
4101 {
4102 struct nlattr *nest;
4103
4104 nest = nla_nest_start(skb, attr);
4105 if (!nest)
4106 goto nla_put_failure;
4107 if (obj->type->dump(skb, obj, reset) < 0)
4108 goto nla_put_failure;
4109 nla_nest_end(skb, nest);
4110 return 0;
4111
4112 nla_put_failure:
4113 return -1;
4114 }
4115
4116 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4117 {
4118 const struct nft_object_type *type;
4119
4120 list_for_each_entry(type, &nf_tables_objects, list) {
4121 if (objtype == type->type)
4122 return type;
4123 }
4124 return NULL;
4125 }
4126
4127 static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4128 {
4129 const struct nft_object_type *type;
4130
4131 type = __nft_obj_type_get(objtype);
4132 if (type != NULL && try_module_get(type->owner))
4133 return type;
4134
4135 #ifdef CONFIG_MODULES
4136 if (type == NULL) {
4137 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4138 request_module("nft-obj-%u", objtype);
4139 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4140 if (__nft_obj_type_get(objtype))
4141 return ERR_PTR(-EAGAIN);
4142 }
4143 #endif
4144 return ERR_PTR(-ENOENT);
4145 }
4146
4147 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4148 struct sk_buff *skb, const struct nlmsghdr *nlh,
4149 const struct nlattr * const nla[])
4150 {
4151 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4152 const struct nft_object_type *type;
4153 u8 genmask = nft_genmask_next(net);
4154 int family = nfmsg->nfgen_family;
4155 struct nft_af_info *afi;
4156 struct nft_table *table;
4157 struct nft_object *obj;
4158 struct nft_ctx ctx;
4159 u32 objtype;
4160 int err;
4161
4162 if (!nla[NFTA_OBJ_TYPE] ||
4163 !nla[NFTA_OBJ_NAME] ||
4164 !nla[NFTA_OBJ_DATA])
4165 return -EINVAL;
4166
4167 afi = nf_tables_afinfo_lookup(net, family, true);
4168 if (IS_ERR(afi))
4169 return PTR_ERR(afi);
4170
4171 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4172 if (IS_ERR(table))
4173 return PTR_ERR(table);
4174
4175 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4176 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4177 if (IS_ERR(obj)) {
4178 err = PTR_ERR(obj);
4179 if (err != -ENOENT)
4180 return err;
4181
4182 } else {
4183 if (nlh->nlmsg_flags & NLM_F_EXCL)
4184 return -EEXIST;
4185
4186 return 0;
4187 }
4188
4189 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4190
4191 type = nft_obj_type_get(objtype);
4192 if (IS_ERR(type))
4193 return PTR_ERR(type);
4194
4195 obj = nft_obj_init(type, nla[NFTA_OBJ_DATA]);
4196 if (IS_ERR(obj)) {
4197 err = PTR_ERR(obj);
4198 goto err1;
4199 }
4200 obj->table = table;
4201 nla_strlcpy(obj->name, nla[NFTA_OBJ_NAME], NFT_OBJ_MAXNAMELEN);
4202
4203 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4204 if (err < 0)
4205 goto err2;
4206
4207 list_add_tail_rcu(&obj->list, &table->objects);
4208 table->use++;
4209 return 0;
4210 err2:
4211 if (obj->type->destroy)
4212 obj->type->destroy(obj);
4213 kfree(obj);
4214 err1:
4215 module_put(type->owner);
4216 return err;
4217 }
4218
4219 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4220 u32 portid, u32 seq, int event, u32 flags,
4221 int family, const struct nft_table *table,
4222 struct nft_object *obj, bool reset)
4223 {
4224 struct nfgenmsg *nfmsg;
4225 struct nlmsghdr *nlh;
4226
4227 event |= NFNL_SUBSYS_NFTABLES << 8;
4228 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4229 if (nlh == NULL)
4230 goto nla_put_failure;
4231
4232 nfmsg = nlmsg_data(nlh);
4233 nfmsg->nfgen_family = family;
4234 nfmsg->version = NFNETLINK_V0;
4235 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4236
4237 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4238 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
4239 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->type->type)) ||
4240 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
4241 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
4242 goto nla_put_failure;
4243
4244 nlmsg_end(skb, nlh);
4245 return 0;
4246
4247 nla_put_failure:
4248 nlmsg_trim(skb, nlh);
4249 return -1;
4250 }
4251
4252 struct nft_obj_filter {
4253 char table[NFT_OBJ_MAXNAMELEN];
4254 u32 type;
4255 };
4256
4257 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4258 {
4259 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4260 const struct nft_af_info *afi;
4261 const struct nft_table *table;
4262 unsigned int idx = 0, s_idx = cb->args[0];
4263 struct nft_obj_filter *filter = cb->data;
4264 struct net *net = sock_net(skb->sk);
4265 int family = nfmsg->nfgen_family;
4266 struct nft_object *obj;
4267 bool reset = false;
4268
4269 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4270 reset = true;
4271
4272 rcu_read_lock();
4273 cb->seq = net->nft.base_seq;
4274
4275 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
4276 if (family != NFPROTO_UNSPEC && family != afi->family)
4277 continue;
4278
4279 list_for_each_entry_rcu(table, &afi->tables, list) {
4280 list_for_each_entry_rcu(obj, &table->objects, list) {
4281 if (!nft_is_active(net, obj))
4282 goto cont;
4283 if (idx < s_idx)
4284 goto cont;
4285 if (idx > s_idx)
4286 memset(&cb->args[1], 0,
4287 sizeof(cb->args) - sizeof(cb->args[0]));
4288 if (filter && filter->table[0] &&
4289 strcmp(filter->table, table->name))
4290 goto cont;
4291 if (filter &&
4292 filter->type != NFT_OBJECT_UNSPEC &&
4293 obj->type->type != filter->type)
4294 goto cont;
4295
4296 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4297 cb->nlh->nlmsg_seq,
4298 NFT_MSG_NEWOBJ,
4299 NLM_F_MULTI | NLM_F_APPEND,
4300 afi->family, table, obj, reset) < 0)
4301 goto done;
4302
4303 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4304 cont:
4305 idx++;
4306 }
4307 }
4308 }
4309 done:
4310 rcu_read_unlock();
4311
4312 cb->args[0] = idx;
4313 return skb->len;
4314 }
4315
4316 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4317 {
4318 kfree(cb->data);
4319
4320 return 0;
4321 }
4322
4323 static struct nft_obj_filter *
4324 nft_obj_filter_alloc(const struct nlattr * const nla[])
4325 {
4326 struct nft_obj_filter *filter;
4327
4328 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
4329 if (!filter)
4330 return ERR_PTR(-ENOMEM);
4331
4332 if (nla[NFTA_OBJ_TABLE])
4333 nla_strlcpy(filter->table, nla[NFTA_OBJ_TABLE],
4334 NFT_TABLE_MAXNAMELEN);
4335 if (nla[NFTA_OBJ_TYPE])
4336 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4337
4338 return filter;
4339 }
4340
4341 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
4342 struct sk_buff *skb, const struct nlmsghdr *nlh,
4343 const struct nlattr * const nla[])
4344 {
4345 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4346 u8 genmask = nft_genmask_cur(net);
4347 int family = nfmsg->nfgen_family;
4348 const struct nft_af_info *afi;
4349 const struct nft_table *table;
4350 struct nft_object *obj;
4351 struct sk_buff *skb2;
4352 bool reset = false;
4353 u32 objtype;
4354 int err;
4355
4356 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4357 struct netlink_dump_control c = {
4358 .dump = nf_tables_dump_obj,
4359 .done = nf_tables_dump_obj_done,
4360 };
4361
4362 if (nla[NFTA_OBJ_TABLE] ||
4363 nla[NFTA_OBJ_TYPE]) {
4364 struct nft_obj_filter *filter;
4365
4366 filter = nft_obj_filter_alloc(nla);
4367 if (IS_ERR(filter))
4368 return -ENOMEM;
4369
4370 c.data = filter;
4371 }
4372 return netlink_dump_start(nlsk, skb, nlh, &c);
4373 }
4374
4375 if (!nla[NFTA_OBJ_NAME] ||
4376 !nla[NFTA_OBJ_TYPE])
4377 return -EINVAL;
4378
4379 afi = nf_tables_afinfo_lookup(net, family, false);
4380 if (IS_ERR(afi))
4381 return PTR_ERR(afi);
4382
4383 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4384 if (IS_ERR(table))
4385 return PTR_ERR(table);
4386
4387 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4388 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4389 if (IS_ERR(obj))
4390 return PTR_ERR(obj);
4391
4392 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4393 if (!skb2)
4394 return -ENOMEM;
4395
4396 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4397 reset = true;
4398
4399 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
4400 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
4401 family, table, obj, reset);
4402 if (err < 0)
4403 goto err;
4404
4405 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4406 err:
4407 kfree_skb(skb2);
4408 return err;
4409
4410 return 0;
4411 }
4412
4413 static void nft_obj_destroy(struct nft_object *obj)
4414 {
4415 if (obj->type->destroy)
4416 obj->type->destroy(obj);
4417
4418 module_put(obj->type->owner);
4419 kfree(obj);
4420 }
4421
4422 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
4423 struct sk_buff *skb, const struct nlmsghdr *nlh,
4424 const struct nlattr * const nla[])
4425 {
4426 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4427 u8 genmask = nft_genmask_next(net);
4428 int family = nfmsg->nfgen_family;
4429 struct nft_af_info *afi;
4430 struct nft_table *table;
4431 struct nft_object *obj;
4432 struct nft_ctx ctx;
4433 u32 objtype;
4434
4435 if (!nla[NFTA_OBJ_TYPE] ||
4436 !nla[NFTA_OBJ_NAME])
4437 return -EINVAL;
4438
4439 afi = nf_tables_afinfo_lookup(net, family, true);
4440 if (IS_ERR(afi))
4441 return PTR_ERR(afi);
4442
4443 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4444 if (IS_ERR(table))
4445 return PTR_ERR(table);
4446
4447 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4448 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4449 if (IS_ERR(obj))
4450 return PTR_ERR(obj);
4451 if (obj->use > 0)
4452 return -EBUSY;
4453
4454 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4455
4456 return nft_delobj(&ctx, obj);
4457 }
4458
4459 void nft_obj_notify(struct net *net, struct nft_table *table,
4460 struct nft_object *obj, u32 portid, u32 seq, int event,
4461 int family, int report, gfp_t gfp)
4462 {
4463 struct sk_buff *skb;
4464 int err;
4465
4466 if (!report &&
4467 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4468 return;
4469
4470 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
4471 if (skb == NULL)
4472 goto err;
4473
4474 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
4475 table, obj, false);
4476 if (err < 0) {
4477 kfree_skb(skb);
4478 goto err;
4479 }
4480
4481 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
4482 return;
4483 err:
4484 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4485 }
4486 EXPORT_SYMBOL_GPL(nft_obj_notify);
4487
4488 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
4489 struct nft_object *obj, int event)
4490 {
4491 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
4492 ctx->afi->family, ctx->report, GFP_KERNEL);
4493 }
4494
4495 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
4496 u32 portid, u32 seq)
4497 {
4498 struct nlmsghdr *nlh;
4499 struct nfgenmsg *nfmsg;
4500 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
4501
4502 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
4503 if (nlh == NULL)
4504 goto nla_put_failure;
4505
4506 nfmsg = nlmsg_data(nlh);
4507 nfmsg->nfgen_family = AF_UNSPEC;
4508 nfmsg->version = NFNETLINK_V0;
4509 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4510
4511 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
4512 goto nla_put_failure;
4513
4514 nlmsg_end(skb, nlh);
4515 return 0;
4516
4517 nla_put_failure:
4518 nlmsg_trim(skb, nlh);
4519 return -EMSGSIZE;
4520 }
4521
4522 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
4523 int event)
4524 {
4525 struct nlmsghdr *nlh = nlmsg_hdr(skb);
4526 struct sk_buff *skb2;
4527 int err;
4528
4529 if (nlmsg_report(nlh) &&
4530 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4531 return;
4532
4533 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4534 if (skb2 == NULL)
4535 goto err;
4536
4537 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4538 nlh->nlmsg_seq);
4539 if (err < 0) {
4540 kfree_skb(skb2);
4541 goto err;
4542 }
4543
4544 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4545 nlmsg_report(nlh), GFP_KERNEL);
4546 return;
4547 err:
4548 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4549 -ENOBUFS);
4550 }
4551
4552 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
4553 struct sk_buff *skb, const struct nlmsghdr *nlh,
4554 const struct nlattr * const nla[])
4555 {
4556 struct sk_buff *skb2;
4557 int err;
4558
4559 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4560 if (skb2 == NULL)
4561 return -ENOMEM;
4562
4563 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4564 nlh->nlmsg_seq);
4565 if (err < 0)
4566 goto err;
4567
4568 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4569 err:
4570 kfree_skb(skb2);
4571 return err;
4572 }
4573
4574 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
4575 [NFT_MSG_NEWTABLE] = {
4576 .call_batch = nf_tables_newtable,
4577 .attr_count = NFTA_TABLE_MAX,
4578 .policy = nft_table_policy,
4579 },
4580 [NFT_MSG_GETTABLE] = {
4581 .call = nf_tables_gettable,
4582 .attr_count = NFTA_TABLE_MAX,
4583 .policy = nft_table_policy,
4584 },
4585 [NFT_MSG_DELTABLE] = {
4586 .call_batch = nf_tables_deltable,
4587 .attr_count = NFTA_TABLE_MAX,
4588 .policy = nft_table_policy,
4589 },
4590 [NFT_MSG_NEWCHAIN] = {
4591 .call_batch = nf_tables_newchain,
4592 .attr_count = NFTA_CHAIN_MAX,
4593 .policy = nft_chain_policy,
4594 },
4595 [NFT_MSG_GETCHAIN] = {
4596 .call = nf_tables_getchain,
4597 .attr_count = NFTA_CHAIN_MAX,
4598 .policy = nft_chain_policy,
4599 },
4600 [NFT_MSG_DELCHAIN] = {
4601 .call_batch = nf_tables_delchain,
4602 .attr_count = NFTA_CHAIN_MAX,
4603 .policy = nft_chain_policy,
4604 },
4605 [NFT_MSG_NEWRULE] = {
4606 .call_batch = nf_tables_newrule,
4607 .attr_count = NFTA_RULE_MAX,
4608 .policy = nft_rule_policy,
4609 },
4610 [NFT_MSG_GETRULE] = {
4611 .call = nf_tables_getrule,
4612 .attr_count = NFTA_RULE_MAX,
4613 .policy = nft_rule_policy,
4614 },
4615 [NFT_MSG_DELRULE] = {
4616 .call_batch = nf_tables_delrule,
4617 .attr_count = NFTA_RULE_MAX,
4618 .policy = nft_rule_policy,
4619 },
4620 [NFT_MSG_NEWSET] = {
4621 .call_batch = nf_tables_newset,
4622 .attr_count = NFTA_SET_MAX,
4623 .policy = nft_set_policy,
4624 },
4625 [NFT_MSG_GETSET] = {
4626 .call = nf_tables_getset,
4627 .attr_count = NFTA_SET_MAX,
4628 .policy = nft_set_policy,
4629 },
4630 [NFT_MSG_DELSET] = {
4631 .call_batch = nf_tables_delset,
4632 .attr_count = NFTA_SET_MAX,
4633 .policy = nft_set_policy,
4634 },
4635 [NFT_MSG_NEWSETELEM] = {
4636 .call_batch = nf_tables_newsetelem,
4637 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4638 .policy = nft_set_elem_list_policy,
4639 },
4640 [NFT_MSG_GETSETELEM] = {
4641 .call = nf_tables_getsetelem,
4642 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4643 .policy = nft_set_elem_list_policy,
4644 },
4645 [NFT_MSG_DELSETELEM] = {
4646 .call_batch = nf_tables_delsetelem,
4647 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4648 .policy = nft_set_elem_list_policy,
4649 },
4650 [NFT_MSG_GETGEN] = {
4651 .call = nf_tables_getgen,
4652 },
4653 [NFT_MSG_NEWOBJ] = {
4654 .call_batch = nf_tables_newobj,
4655 .attr_count = NFTA_OBJ_MAX,
4656 .policy = nft_obj_policy,
4657 },
4658 [NFT_MSG_GETOBJ] = {
4659 .call = nf_tables_getobj,
4660 .attr_count = NFTA_OBJ_MAX,
4661 .policy = nft_obj_policy,
4662 },
4663 [NFT_MSG_DELOBJ] = {
4664 .call_batch = nf_tables_delobj,
4665 .attr_count = NFTA_OBJ_MAX,
4666 .policy = nft_obj_policy,
4667 },
4668 [NFT_MSG_GETOBJ_RESET] = {
4669 .call = nf_tables_getobj,
4670 .attr_count = NFTA_OBJ_MAX,
4671 .policy = nft_obj_policy,
4672 },
4673 };
4674
4675 static void nft_chain_commit_update(struct nft_trans *trans)
4676 {
4677 struct nft_base_chain *basechain;
4678
4679 if (nft_trans_chain_name(trans)[0])
4680 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
4681
4682 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
4683 return;
4684
4685 basechain = nft_base_chain(trans->ctx.chain);
4686 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
4687
4688 switch (nft_trans_chain_policy(trans)) {
4689 case NF_DROP:
4690 case NF_ACCEPT:
4691 basechain->policy = nft_trans_chain_policy(trans);
4692 break;
4693 }
4694 }
4695
4696 static void nf_tables_commit_release(struct nft_trans *trans)
4697 {
4698 switch (trans->msg_type) {
4699 case NFT_MSG_DELTABLE:
4700 nf_tables_table_destroy(&trans->ctx);
4701 break;
4702 case NFT_MSG_DELCHAIN:
4703 nf_tables_chain_destroy(trans->ctx.chain);
4704 break;
4705 case NFT_MSG_DELRULE:
4706 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4707 break;
4708 case NFT_MSG_DELSET:
4709 nft_set_destroy(nft_trans_set(trans));
4710 break;
4711 case NFT_MSG_DELSETELEM:
4712 nft_set_elem_destroy(nft_trans_elem_set(trans),
4713 nft_trans_elem(trans).priv, true);
4714 break;
4715 case NFT_MSG_DELOBJ:
4716 nft_obj_destroy(nft_trans_obj(trans));
4717 break;
4718 }
4719 kfree(trans);
4720 }
4721
4722 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
4723 {
4724 struct nft_trans *trans, *next;
4725 struct nft_trans_elem *te;
4726
4727 /* Bump generation counter, invalidate any dump in progress */
4728 while (++net->nft.base_seq == 0);
4729
4730 /* A new generation has just started */
4731 net->nft.gencursor = nft_gencursor_next(net);
4732
4733 /* Make sure all packets have left the previous generation before
4734 * purging old rules.
4735 */
4736 synchronize_rcu();
4737
4738 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4739 switch (trans->msg_type) {
4740 case NFT_MSG_NEWTABLE:
4741 if (nft_trans_table_update(trans)) {
4742 if (!nft_trans_table_enable(trans)) {
4743 nf_tables_table_disable(net,
4744 trans->ctx.afi,
4745 trans->ctx.table);
4746 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4747 }
4748 } else {
4749 nft_clear(net, trans->ctx.table);
4750 }
4751 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
4752 nft_trans_destroy(trans);
4753 break;
4754 case NFT_MSG_DELTABLE:
4755 list_del_rcu(&trans->ctx.table->list);
4756 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
4757 break;
4758 case NFT_MSG_NEWCHAIN:
4759 if (nft_trans_chain_update(trans))
4760 nft_chain_commit_update(trans);
4761 else
4762 nft_clear(net, trans->ctx.chain);
4763
4764 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
4765 nft_trans_destroy(trans);
4766 break;
4767 case NFT_MSG_DELCHAIN:
4768 list_del_rcu(&trans->ctx.chain->list);
4769 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
4770 nf_tables_unregister_hooks(trans->ctx.net,
4771 trans->ctx.table,
4772 trans->ctx.chain,
4773 trans->ctx.afi->nops);
4774 break;
4775 case NFT_MSG_NEWRULE:
4776 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4777 nf_tables_rule_notify(&trans->ctx,
4778 nft_trans_rule(trans),
4779 NFT_MSG_NEWRULE);
4780 nft_trans_destroy(trans);
4781 break;
4782 case NFT_MSG_DELRULE:
4783 list_del_rcu(&nft_trans_rule(trans)->list);
4784 nf_tables_rule_notify(&trans->ctx,
4785 nft_trans_rule(trans),
4786 NFT_MSG_DELRULE);
4787 break;
4788 case NFT_MSG_NEWSET:
4789 nft_clear(net, nft_trans_set(trans));
4790 /* This avoids hitting -EBUSY when deleting the table
4791 * from the transaction.
4792 */
4793 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4794 !list_empty(&nft_trans_set(trans)->bindings))
4795 trans->ctx.table->use--;
4796
4797 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4798 NFT_MSG_NEWSET, GFP_KERNEL);
4799 nft_trans_destroy(trans);
4800 break;
4801 case NFT_MSG_DELSET:
4802 list_del_rcu(&nft_trans_set(trans)->list);
4803 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4804 NFT_MSG_DELSET, GFP_KERNEL);
4805 break;
4806 case NFT_MSG_NEWSETELEM:
4807 te = (struct nft_trans_elem *)trans->data;
4808
4809 te->set->ops->activate(net, te->set, &te->elem);
4810 nf_tables_setelem_notify(&trans->ctx, te->set,
4811 &te->elem,
4812 NFT_MSG_NEWSETELEM, 0);
4813 nft_trans_destroy(trans);
4814 break;
4815 case NFT_MSG_DELSETELEM:
4816 te = (struct nft_trans_elem *)trans->data;
4817
4818 nf_tables_setelem_notify(&trans->ctx, te->set,
4819 &te->elem,
4820 NFT_MSG_DELSETELEM, 0);
4821 te->set->ops->remove(net, te->set, &te->elem);
4822 atomic_dec(&te->set->nelems);
4823 te->set->ndeact--;
4824 break;
4825 case NFT_MSG_NEWOBJ:
4826 nft_clear(net, nft_trans_obj(trans));
4827 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4828 NFT_MSG_NEWOBJ);
4829 nft_trans_destroy(trans);
4830 break;
4831 case NFT_MSG_DELOBJ:
4832 list_del_rcu(&nft_trans_obj(trans)->list);
4833 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4834 NFT_MSG_DELOBJ);
4835 break;
4836 }
4837 }
4838
4839 synchronize_rcu();
4840
4841 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4842 list_del(&trans->list);
4843 nf_tables_commit_release(trans);
4844 }
4845
4846 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
4847
4848 return 0;
4849 }
4850
4851 static void nf_tables_abort_release(struct nft_trans *trans)
4852 {
4853 switch (trans->msg_type) {
4854 case NFT_MSG_NEWTABLE:
4855 nf_tables_table_destroy(&trans->ctx);
4856 break;
4857 case NFT_MSG_NEWCHAIN:
4858 nf_tables_chain_destroy(trans->ctx.chain);
4859 break;
4860 case NFT_MSG_NEWRULE:
4861 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4862 break;
4863 case NFT_MSG_NEWSET:
4864 nft_set_destroy(nft_trans_set(trans));
4865 break;
4866 case NFT_MSG_NEWSETELEM:
4867 nft_set_elem_destroy(nft_trans_elem_set(trans),
4868 nft_trans_elem(trans).priv, true);
4869 break;
4870 case NFT_MSG_NEWOBJ:
4871 nft_obj_destroy(nft_trans_obj(trans));
4872 break;
4873 }
4874 kfree(trans);
4875 }
4876
4877 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
4878 {
4879 struct nft_trans *trans, *next;
4880 struct nft_trans_elem *te;
4881
4882 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4883 list) {
4884 switch (trans->msg_type) {
4885 case NFT_MSG_NEWTABLE:
4886 if (nft_trans_table_update(trans)) {
4887 if (nft_trans_table_enable(trans)) {
4888 nf_tables_table_disable(net,
4889 trans->ctx.afi,
4890 trans->ctx.table);
4891 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4892 }
4893 nft_trans_destroy(trans);
4894 } else {
4895 list_del_rcu(&trans->ctx.table->list);
4896 }
4897 break;
4898 case NFT_MSG_DELTABLE:
4899 nft_clear(trans->ctx.net, trans->ctx.table);
4900 nft_trans_destroy(trans);
4901 break;
4902 case NFT_MSG_NEWCHAIN:
4903 if (nft_trans_chain_update(trans)) {
4904 free_percpu(nft_trans_chain_stats(trans));
4905
4906 nft_trans_destroy(trans);
4907 } else {
4908 trans->ctx.table->use--;
4909 list_del_rcu(&trans->ctx.chain->list);
4910 nf_tables_unregister_hooks(trans->ctx.net,
4911 trans->ctx.table,
4912 trans->ctx.chain,
4913 trans->ctx.afi->nops);
4914 }
4915 break;
4916 case NFT_MSG_DELCHAIN:
4917 trans->ctx.table->use++;
4918 nft_clear(trans->ctx.net, trans->ctx.chain);
4919 nft_trans_destroy(trans);
4920 break;
4921 case NFT_MSG_NEWRULE:
4922 trans->ctx.chain->use--;
4923 list_del_rcu(&nft_trans_rule(trans)->list);
4924 break;
4925 case NFT_MSG_DELRULE:
4926 trans->ctx.chain->use++;
4927 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4928 nft_trans_destroy(trans);
4929 break;
4930 case NFT_MSG_NEWSET:
4931 trans->ctx.table->use--;
4932 list_del_rcu(&nft_trans_set(trans)->list);
4933 break;
4934 case NFT_MSG_DELSET:
4935 trans->ctx.table->use++;
4936 nft_clear(trans->ctx.net, nft_trans_set(trans));
4937 nft_trans_destroy(trans);
4938 break;
4939 case NFT_MSG_NEWSETELEM:
4940 te = (struct nft_trans_elem *)trans->data;
4941
4942 te->set->ops->remove(net, te->set, &te->elem);
4943 atomic_dec(&te->set->nelems);
4944 break;
4945 case NFT_MSG_DELSETELEM:
4946 te = (struct nft_trans_elem *)trans->data;
4947
4948 te->set->ops->activate(net, te->set, &te->elem);
4949 te->set->ndeact--;
4950
4951 nft_trans_destroy(trans);
4952 break;
4953 case NFT_MSG_NEWOBJ:
4954 trans->ctx.table->use--;
4955 list_del_rcu(&nft_trans_obj(trans)->list);
4956 break;
4957 case NFT_MSG_DELOBJ:
4958 trans->ctx.table->use++;
4959 nft_clear(trans->ctx.net, nft_trans_obj(trans));
4960 nft_trans_destroy(trans);
4961 break;
4962 }
4963 }
4964
4965 synchronize_rcu();
4966
4967 list_for_each_entry_safe_reverse(trans, next,
4968 &net->nft.commit_list, list) {
4969 list_del(&trans->list);
4970 nf_tables_abort_release(trans);
4971 }
4972
4973 return 0;
4974 }
4975
4976 static bool nf_tables_valid_genid(struct net *net, u32 genid)
4977 {
4978 return net->nft.base_seq == genid;
4979 }
4980
4981 static const struct nfnetlink_subsystem nf_tables_subsys = {
4982 .name = "nf_tables",
4983 .subsys_id = NFNL_SUBSYS_NFTABLES,
4984 .cb_count = NFT_MSG_MAX,
4985 .cb = nf_tables_cb,
4986 .commit = nf_tables_commit,
4987 .abort = nf_tables_abort,
4988 .valid_genid = nf_tables_valid_genid,
4989 };
4990
4991 int nft_chain_validate_dependency(const struct nft_chain *chain,
4992 enum nft_chain_type type)
4993 {
4994 const struct nft_base_chain *basechain;
4995
4996 if (chain->flags & NFT_BASE_CHAIN) {
4997 basechain = nft_base_chain(chain);
4998 if (basechain->type->type != type)
4999 return -EOPNOTSUPP;
5000 }
5001 return 0;
5002 }
5003 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
5004
5005 int nft_chain_validate_hooks(const struct nft_chain *chain,
5006 unsigned int hook_flags)
5007 {
5008 struct nft_base_chain *basechain;
5009
5010 if (chain->flags & NFT_BASE_CHAIN) {
5011 basechain = nft_base_chain(chain);
5012
5013 if ((1 << basechain->ops[0].hooknum) & hook_flags)
5014 return 0;
5015
5016 return -EOPNOTSUPP;
5017 }
5018
5019 return 0;
5020 }
5021 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
5022
5023 /*
5024 * Loop detection - walk through the ruleset beginning at the destination chain
5025 * of a new jump until either the source chain is reached (loop) or all
5026 * reachable chains have been traversed.
5027 *
5028 * The loop check is performed whenever a new jump verdict is added to an
5029 * expression or verdict map or a verdict map is bound to a new chain.
5030 */
5031
5032 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5033 const struct nft_chain *chain);
5034
5035 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
5036 struct nft_set *set,
5037 const struct nft_set_iter *iter,
5038 struct nft_set_elem *elem)
5039 {
5040 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5041 const struct nft_data *data;
5042
5043 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5044 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
5045 return 0;
5046
5047 data = nft_set_ext_data(ext);
5048 switch (data->verdict.code) {
5049 case NFT_JUMP:
5050 case NFT_GOTO:
5051 return nf_tables_check_loops(ctx, data->verdict.chain);
5052 default:
5053 return 0;
5054 }
5055 }
5056
5057 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5058 const struct nft_chain *chain)
5059 {
5060 const struct nft_rule *rule;
5061 const struct nft_expr *expr, *last;
5062 struct nft_set *set;
5063 struct nft_set_binding *binding;
5064 struct nft_set_iter iter;
5065
5066 if (ctx->chain == chain)
5067 return -ELOOP;
5068
5069 list_for_each_entry(rule, &chain->rules, list) {
5070 nft_rule_for_each_expr(expr, last, rule) {
5071 const struct nft_data *data = NULL;
5072 int err;
5073
5074 if (!expr->ops->validate)
5075 continue;
5076
5077 err = expr->ops->validate(ctx, expr, &data);
5078 if (err < 0)
5079 return err;
5080
5081 if (data == NULL)
5082 continue;
5083
5084 switch (data->verdict.code) {
5085 case NFT_JUMP:
5086 case NFT_GOTO:
5087 err = nf_tables_check_loops(ctx,
5088 data->verdict.chain);
5089 if (err < 0)
5090 return err;
5091 default:
5092 break;
5093 }
5094 }
5095 }
5096
5097 list_for_each_entry(set, &ctx->table->sets, list) {
5098 if (!nft_is_active_next(ctx->net, set))
5099 continue;
5100 if (!(set->flags & NFT_SET_MAP) ||
5101 set->dtype != NFT_DATA_VERDICT)
5102 continue;
5103
5104 list_for_each_entry(binding, &set->bindings, list) {
5105 if (!(binding->flags & NFT_SET_MAP) ||
5106 binding->chain != chain)
5107 continue;
5108
5109 iter.genmask = nft_genmask_next(ctx->net);
5110 iter.skip = 0;
5111 iter.count = 0;
5112 iter.err = 0;
5113 iter.fn = nf_tables_loop_check_setelem;
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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