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Merge tag 'efi-urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi into...
[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 iter.flush = false;
3149
3150 set->ops->walk(ctx, set, &iter);
3151 if (iter.err < 0)
3152 return iter.err;
3153 }
3154 bind:
3155 binding->chain = ctx->chain;
3156 list_add_tail_rcu(&binding->list, &set->bindings);
3157 return 0;
3158 }
3159 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3160
3161 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3162 struct nft_set_binding *binding)
3163 {
3164 list_del_rcu(&binding->list);
3165
3166 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
3167 nft_is_active(ctx->net, set))
3168 nf_tables_set_destroy(ctx, set);
3169 }
3170 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3171
3172 const struct nft_set_ext_type nft_set_ext_types[] = {
3173 [NFT_SET_EXT_KEY] = {
3174 .align = __alignof__(u32),
3175 },
3176 [NFT_SET_EXT_DATA] = {
3177 .align = __alignof__(u32),
3178 },
3179 [NFT_SET_EXT_EXPR] = {
3180 .align = __alignof__(struct nft_expr),
3181 },
3182 [NFT_SET_EXT_OBJREF] = {
3183 .len = sizeof(struct nft_object *),
3184 .align = __alignof__(struct nft_object *),
3185 },
3186 [NFT_SET_EXT_FLAGS] = {
3187 .len = sizeof(u8),
3188 .align = __alignof__(u8),
3189 },
3190 [NFT_SET_EXT_TIMEOUT] = {
3191 .len = sizeof(u64),
3192 .align = __alignof__(u64),
3193 },
3194 [NFT_SET_EXT_EXPIRATION] = {
3195 .len = sizeof(unsigned long),
3196 .align = __alignof__(unsigned long),
3197 },
3198 [NFT_SET_EXT_USERDATA] = {
3199 .len = sizeof(struct nft_userdata),
3200 .align = __alignof__(struct nft_userdata),
3201 },
3202 };
3203 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3204
3205 /*
3206 * Set elements
3207 */
3208
3209 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3210 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3211 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3212 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3213 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3214 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3215 .len = NFT_USERDATA_MAXLEN },
3216 };
3217
3218 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3219 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3220 .len = NFT_TABLE_MAXNAMELEN - 1 },
3221 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3222 .len = NFT_SET_MAXNAMELEN - 1 },
3223 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3224 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3225 };
3226
3227 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3228 const struct sk_buff *skb,
3229 const struct nlmsghdr *nlh,
3230 const struct nlattr * const nla[],
3231 u8 genmask)
3232 {
3233 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3234 struct nft_af_info *afi;
3235 struct nft_table *table;
3236
3237 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3238 if (IS_ERR(afi))
3239 return PTR_ERR(afi);
3240
3241 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3242 genmask);
3243 if (IS_ERR(table))
3244 return PTR_ERR(table);
3245
3246 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
3247 return 0;
3248 }
3249
3250 static int nf_tables_fill_setelem(struct sk_buff *skb,
3251 const struct nft_set *set,
3252 const struct nft_set_elem *elem)
3253 {
3254 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3255 unsigned char *b = skb_tail_pointer(skb);
3256 struct nlattr *nest;
3257
3258 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3259 if (nest == NULL)
3260 goto nla_put_failure;
3261
3262 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3263 NFT_DATA_VALUE, set->klen) < 0)
3264 goto nla_put_failure;
3265
3266 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3267 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3268 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3269 set->dlen) < 0)
3270 goto nla_put_failure;
3271
3272 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3273 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3274 goto nla_put_failure;
3275
3276 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3277 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3278 (*nft_set_ext_obj(ext))->name) < 0)
3279 goto nla_put_failure;
3280
3281 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3282 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3283 htonl(*nft_set_ext_flags(ext))))
3284 goto nla_put_failure;
3285
3286 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3287 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3288 cpu_to_be64(jiffies_to_msecs(
3289 *nft_set_ext_timeout(ext))),
3290 NFTA_SET_ELEM_PAD))
3291 goto nla_put_failure;
3292
3293 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3294 unsigned long expires, now = jiffies;
3295
3296 expires = *nft_set_ext_expiration(ext);
3297 if (time_before(now, expires))
3298 expires -= now;
3299 else
3300 expires = 0;
3301
3302 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3303 cpu_to_be64(jiffies_to_msecs(expires)),
3304 NFTA_SET_ELEM_PAD))
3305 goto nla_put_failure;
3306 }
3307
3308 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3309 struct nft_userdata *udata;
3310
3311 udata = nft_set_ext_userdata(ext);
3312 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3313 udata->len + 1, udata->data))
3314 goto nla_put_failure;
3315 }
3316
3317 nla_nest_end(skb, nest);
3318 return 0;
3319
3320 nla_put_failure:
3321 nlmsg_trim(skb, b);
3322 return -EMSGSIZE;
3323 }
3324
3325 struct nft_set_dump_args {
3326 const struct netlink_callback *cb;
3327 struct nft_set_iter iter;
3328 struct sk_buff *skb;
3329 };
3330
3331 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3332 struct nft_set *set,
3333 const struct nft_set_iter *iter,
3334 struct nft_set_elem *elem)
3335 {
3336 struct nft_set_dump_args *args;
3337
3338 args = container_of(iter, struct nft_set_dump_args, iter);
3339 return nf_tables_fill_setelem(args->skb, set, elem);
3340 }
3341
3342 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3343 {
3344 struct net *net = sock_net(skb->sk);
3345 u8 genmask = nft_genmask_cur(net);
3346 struct nft_set *set;
3347 struct nft_set_dump_args args;
3348 struct nft_ctx ctx;
3349 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3350 struct nfgenmsg *nfmsg;
3351 struct nlmsghdr *nlh;
3352 struct nlattr *nest;
3353 u32 portid, seq;
3354 int event, err;
3355
3356 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3357 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
3358 if (err < 0)
3359 return err;
3360
3361 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
3362 (void *)nla, genmask);
3363 if (err < 0)
3364 return err;
3365
3366 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3367 genmask);
3368 if (IS_ERR(set))
3369 return PTR_ERR(set);
3370
3371 event = NFT_MSG_NEWSETELEM;
3372 event |= NFNL_SUBSYS_NFTABLES << 8;
3373 portid = NETLINK_CB(cb->skb).portid;
3374 seq = cb->nlh->nlmsg_seq;
3375
3376 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3377 NLM_F_MULTI);
3378 if (nlh == NULL)
3379 goto nla_put_failure;
3380
3381 nfmsg = nlmsg_data(nlh);
3382 nfmsg->nfgen_family = ctx.afi->family;
3383 nfmsg->version = NFNETLINK_V0;
3384 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
3385
3386 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3387 goto nla_put_failure;
3388 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3389 goto nla_put_failure;
3390
3391 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3392 if (nest == NULL)
3393 goto nla_put_failure;
3394
3395 args.cb = cb;
3396 args.skb = skb;
3397 args.iter.genmask = nft_genmask_cur(ctx.net);
3398 args.iter.skip = cb->args[0];
3399 args.iter.count = 0;
3400 args.iter.err = 0;
3401 args.iter.fn = nf_tables_dump_setelem;
3402 args.iter.flush = false;
3403 set->ops->walk(&ctx, set, &args.iter);
3404
3405 nla_nest_end(skb, nest);
3406 nlmsg_end(skb, nlh);
3407
3408 if (args.iter.err && args.iter.err != -EMSGSIZE)
3409 return args.iter.err;
3410 if (args.iter.count == cb->args[0])
3411 return 0;
3412
3413 cb->args[0] = args.iter.count;
3414 return skb->len;
3415
3416 nla_put_failure:
3417 return -ENOSPC;
3418 }
3419
3420 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3421 struct sk_buff *skb, const struct nlmsghdr *nlh,
3422 const struct nlattr * const nla[])
3423 {
3424 u8 genmask = nft_genmask_cur(net);
3425 const struct nft_set *set;
3426 struct nft_ctx ctx;
3427 int err;
3428
3429 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3430 if (err < 0)
3431 return err;
3432
3433 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3434 genmask);
3435 if (IS_ERR(set))
3436 return PTR_ERR(set);
3437
3438 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3439 struct netlink_dump_control c = {
3440 .dump = nf_tables_dump_set,
3441 };
3442 return netlink_dump_start(nlsk, skb, nlh, &c);
3443 }
3444 return -EOPNOTSUPP;
3445 }
3446
3447 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3448 const struct nft_ctx *ctx, u32 seq,
3449 u32 portid, int event, u16 flags,
3450 const struct nft_set *set,
3451 const struct nft_set_elem *elem)
3452 {
3453 struct nfgenmsg *nfmsg;
3454 struct nlmsghdr *nlh;
3455 struct nlattr *nest;
3456 int err;
3457
3458 event |= NFNL_SUBSYS_NFTABLES << 8;
3459 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3460 flags);
3461 if (nlh == NULL)
3462 goto nla_put_failure;
3463
3464 nfmsg = nlmsg_data(nlh);
3465 nfmsg->nfgen_family = ctx->afi->family;
3466 nfmsg->version = NFNETLINK_V0;
3467 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3468
3469 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3470 goto nla_put_failure;
3471 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3472 goto nla_put_failure;
3473
3474 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3475 if (nest == NULL)
3476 goto nla_put_failure;
3477
3478 err = nf_tables_fill_setelem(skb, set, elem);
3479 if (err < 0)
3480 goto nla_put_failure;
3481
3482 nla_nest_end(skb, nest);
3483
3484 nlmsg_end(skb, nlh);
3485 return 0;
3486
3487 nla_put_failure:
3488 nlmsg_trim(skb, nlh);
3489 return -1;
3490 }
3491
3492 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
3493 const struct nft_set *set,
3494 const struct nft_set_elem *elem,
3495 int event, u16 flags)
3496 {
3497 struct net *net = ctx->net;
3498 u32 portid = ctx->portid;
3499 struct sk_buff *skb;
3500 int err;
3501
3502 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3503 return;
3504
3505 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3506 if (skb == NULL)
3507 goto err;
3508
3509 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3510 set, elem);
3511 if (err < 0) {
3512 kfree_skb(skb);
3513 goto err;
3514 }
3515
3516 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3517 GFP_KERNEL);
3518 return;
3519 err:
3520 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3521 }
3522
3523 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3524 int msg_type,
3525 struct nft_set *set)
3526 {
3527 struct nft_trans *trans;
3528
3529 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3530 if (trans == NULL)
3531 return NULL;
3532
3533 nft_trans_elem_set(trans) = set;
3534 return trans;
3535 }
3536
3537 void *nft_set_elem_init(const struct nft_set *set,
3538 const struct nft_set_ext_tmpl *tmpl,
3539 const u32 *key, const u32 *data,
3540 u64 timeout, gfp_t gfp)
3541 {
3542 struct nft_set_ext *ext;
3543 void *elem;
3544
3545 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3546 if (elem == NULL)
3547 return NULL;
3548
3549 ext = nft_set_elem_ext(set, elem);
3550 nft_set_ext_init(ext, tmpl);
3551
3552 memcpy(nft_set_ext_key(ext), key, set->klen);
3553 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3554 memcpy(nft_set_ext_data(ext), data, set->dlen);
3555 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3556 *nft_set_ext_expiration(ext) =
3557 jiffies + timeout;
3558 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3559 *nft_set_ext_timeout(ext) = timeout;
3560
3561 return elem;
3562 }
3563
3564 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
3565 bool destroy_expr)
3566 {
3567 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3568
3569 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3570 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3571 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
3572 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3573 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3574 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
3575 (*nft_set_ext_obj(ext))->use--;
3576 kfree(elem);
3577 }
3578 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3579
3580 static int nft_setelem_parse_flags(const struct nft_set *set,
3581 const struct nlattr *attr, u32 *flags)
3582 {
3583 if (attr == NULL)
3584 return 0;
3585
3586 *flags = ntohl(nla_get_be32(attr));
3587 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3588 return -EINVAL;
3589 if (!(set->flags & NFT_SET_INTERVAL) &&
3590 *flags & NFT_SET_ELEM_INTERVAL_END)
3591 return -EINVAL;
3592
3593 return 0;
3594 }
3595
3596 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3597 const struct nlattr *attr, u32 nlmsg_flags)
3598 {
3599 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3600 u8 genmask = nft_genmask_next(ctx->net);
3601 struct nft_data_desc d1, d2;
3602 struct nft_set_ext_tmpl tmpl;
3603 struct nft_set_ext *ext, *ext2;
3604 struct nft_set_elem elem;
3605 struct nft_set_binding *binding;
3606 struct nft_object *obj = NULL;
3607 struct nft_userdata *udata;
3608 struct nft_data data;
3609 enum nft_registers dreg;
3610 struct nft_trans *trans;
3611 u32 flags = 0;
3612 u64 timeout;
3613 u8 ulen;
3614 int err;
3615
3616 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3617 nft_set_elem_policy);
3618 if (err < 0)
3619 return err;
3620
3621 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3622 return -EINVAL;
3623
3624 nft_set_ext_prepare(&tmpl);
3625
3626 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3627 if (err < 0)
3628 return err;
3629 if (flags != 0)
3630 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3631
3632 if (set->flags & NFT_SET_MAP) {
3633 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3634 !(flags & NFT_SET_ELEM_INTERVAL_END))
3635 return -EINVAL;
3636 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3637 flags & NFT_SET_ELEM_INTERVAL_END)
3638 return -EINVAL;
3639 } else {
3640 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3641 return -EINVAL;
3642 }
3643
3644 timeout = 0;
3645 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3646 if (!(set->flags & NFT_SET_TIMEOUT))
3647 return -EINVAL;
3648 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3649 nla[NFTA_SET_ELEM_TIMEOUT])));
3650 } else if (set->flags & NFT_SET_TIMEOUT) {
3651 timeout = set->timeout;
3652 }
3653
3654 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3655 nla[NFTA_SET_ELEM_KEY]);
3656 if (err < 0)
3657 goto err1;
3658 err = -EINVAL;
3659 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3660 goto err2;
3661
3662 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3663 if (timeout > 0) {
3664 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3665 if (timeout != set->timeout)
3666 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3667 }
3668
3669 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
3670 if (!(set->flags & NFT_SET_OBJECT)) {
3671 err = -EINVAL;
3672 goto err2;
3673 }
3674 obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
3675 set->objtype, genmask);
3676 if (IS_ERR(obj)) {
3677 err = PTR_ERR(obj);
3678 goto err2;
3679 }
3680 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
3681 }
3682
3683 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3684 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3685 nla[NFTA_SET_ELEM_DATA]);
3686 if (err < 0)
3687 goto err2;
3688
3689 err = -EINVAL;
3690 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3691 goto err3;
3692
3693 dreg = nft_type_to_reg(set->dtype);
3694 list_for_each_entry(binding, &set->bindings, list) {
3695 struct nft_ctx bind_ctx = {
3696 .net = ctx->net,
3697 .afi = ctx->afi,
3698 .table = ctx->table,
3699 .chain = (struct nft_chain *)binding->chain,
3700 };
3701
3702 if (!(binding->flags & NFT_SET_MAP))
3703 continue;
3704
3705 err = nft_validate_register_store(&bind_ctx, dreg,
3706 &data,
3707 d2.type, d2.len);
3708 if (err < 0)
3709 goto err3;
3710 }
3711
3712 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
3713 }
3714
3715 /* The full maximum length of userdata can exceed the maximum
3716 * offset value (U8_MAX) for following extensions, therefor it
3717 * must be the last extension added.
3718 */
3719 ulen = 0;
3720 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3721 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3722 if (ulen > 0)
3723 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3724 ulen);
3725 }
3726
3727 err = -ENOMEM;
3728 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
3729 timeout, GFP_KERNEL);
3730 if (elem.priv == NULL)
3731 goto err3;
3732
3733 ext = nft_set_elem_ext(set, elem.priv);
3734 if (flags)
3735 *nft_set_ext_flags(ext) = flags;
3736 if (ulen > 0) {
3737 udata = nft_set_ext_userdata(ext);
3738 udata->len = ulen - 1;
3739 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3740 }
3741 if (obj) {
3742 *nft_set_ext_obj(ext) = obj;
3743 obj->use++;
3744 }
3745
3746 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3747 if (trans == NULL)
3748 goto err4;
3749
3750 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
3751 err = set->ops->insert(ctx->net, set, &elem, &ext2);
3752 if (err) {
3753 if (err == -EEXIST) {
3754 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3755 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
3756 memcmp(nft_set_ext_data(ext),
3757 nft_set_ext_data(ext2), set->dlen) != 0) ||
3758 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3759 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
3760 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
3761 err = -EBUSY;
3762 else if (!(nlmsg_flags & NLM_F_EXCL))
3763 err = 0;
3764 }
3765 goto err5;
3766 }
3767
3768 if (set->size &&
3769 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
3770 err = -ENFILE;
3771 goto err6;
3772 }
3773
3774 nft_trans_elem(trans) = elem;
3775 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3776 return 0;
3777
3778 err6:
3779 set->ops->remove(ctx->net, set, &elem);
3780 err5:
3781 kfree(trans);
3782 err4:
3783 kfree(elem.priv);
3784 err3:
3785 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3786 nft_data_uninit(&data, d2.type);
3787 err2:
3788 nft_data_uninit(&elem.key.val, d1.type);
3789 err1:
3790 return err;
3791 }
3792
3793 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3794 struct sk_buff *skb, const struct nlmsghdr *nlh,
3795 const struct nlattr * const nla[])
3796 {
3797 u8 genmask = nft_genmask_next(net);
3798 const struct nlattr *attr;
3799 struct nft_set *set;
3800 struct nft_ctx ctx;
3801 int rem, err = 0;
3802
3803 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3804 return -EINVAL;
3805
3806 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3807 if (err < 0)
3808 return err;
3809
3810 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3811 genmask);
3812 if (IS_ERR(set)) {
3813 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3814 set = nf_tables_set_lookup_byid(net,
3815 nla[NFTA_SET_ELEM_LIST_SET_ID],
3816 genmask);
3817 }
3818 if (IS_ERR(set))
3819 return PTR_ERR(set);
3820 }
3821
3822 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3823 return -EBUSY;
3824
3825 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3826 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
3827 if (err < 0)
3828 break;
3829 }
3830 return err;
3831 }
3832
3833 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3834 const struct nlattr *attr)
3835 {
3836 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3837 struct nft_set_ext_tmpl tmpl;
3838 struct nft_data_desc desc;
3839 struct nft_set_elem elem;
3840 struct nft_set_ext *ext;
3841 struct nft_trans *trans;
3842 u32 flags = 0;
3843 void *priv;
3844 int err;
3845
3846 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3847 nft_set_elem_policy);
3848 if (err < 0)
3849 goto err1;
3850
3851 err = -EINVAL;
3852 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3853 goto err1;
3854
3855 nft_set_ext_prepare(&tmpl);
3856
3857 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3858 if (err < 0)
3859 return err;
3860 if (flags != 0)
3861 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3862
3863 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3864 nla[NFTA_SET_ELEM_KEY]);
3865 if (err < 0)
3866 goto err1;
3867
3868 err = -EINVAL;
3869 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3870 goto err2;
3871
3872 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3873
3874 err = -ENOMEM;
3875 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3876 GFP_KERNEL);
3877 if (elem.priv == NULL)
3878 goto err2;
3879
3880 ext = nft_set_elem_ext(set, elem.priv);
3881 if (flags)
3882 *nft_set_ext_flags(ext) = flags;
3883
3884 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3885 if (trans == NULL) {
3886 err = -ENOMEM;
3887 goto err3;
3888 }
3889
3890 priv = set->ops->deactivate(ctx->net, set, &elem);
3891 if (priv == NULL) {
3892 err = -ENOENT;
3893 goto err4;
3894 }
3895 kfree(elem.priv);
3896 elem.priv = priv;
3897
3898 nft_trans_elem(trans) = elem;
3899 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3900 return 0;
3901
3902 err4:
3903 kfree(trans);
3904 err3:
3905 kfree(elem.priv);
3906 err2:
3907 nft_data_uninit(&elem.key.val, desc.type);
3908 err1:
3909 return err;
3910 }
3911
3912 static int nft_flush_set(const struct nft_ctx *ctx,
3913 struct nft_set *set,
3914 const struct nft_set_iter *iter,
3915 struct nft_set_elem *elem)
3916 {
3917 struct nft_trans *trans;
3918 int err;
3919
3920 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
3921 sizeof(struct nft_trans_elem), GFP_ATOMIC);
3922 if (!trans)
3923 return -ENOMEM;
3924
3925 if (!set->ops->flush(ctx->net, set, elem->priv)) {
3926 err = -ENOENT;
3927 goto err1;
3928 }
3929 set->ndeact++;
3930
3931 nft_trans_elem_set(trans) = set;
3932 nft_trans_elem(trans) = *elem;
3933 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3934
3935 return 0;
3936 err1:
3937 kfree(trans);
3938 return err;
3939 }
3940
3941 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3942 struct sk_buff *skb, const struct nlmsghdr *nlh,
3943 const struct nlattr * const nla[])
3944 {
3945 u8 genmask = nft_genmask_next(net);
3946 const struct nlattr *attr;
3947 struct nft_set *set;
3948 struct nft_ctx ctx;
3949 int rem, err = 0;
3950
3951 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3952 if (err < 0)
3953 return err;
3954
3955 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3956 genmask);
3957 if (IS_ERR(set))
3958 return PTR_ERR(set);
3959 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3960 return -EBUSY;
3961
3962 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
3963 struct nft_set_iter iter = {
3964 .genmask = genmask,
3965 .fn = nft_flush_set,
3966 .flush = true,
3967 };
3968 set->ops->walk(&ctx, set, &iter);
3969
3970 return iter.err;
3971 }
3972
3973 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3974 err = nft_del_setelem(&ctx, set, attr);
3975 if (err < 0)
3976 break;
3977
3978 set->ndeact++;
3979 }
3980 return err;
3981 }
3982
3983 void nft_set_gc_batch_release(struct rcu_head *rcu)
3984 {
3985 struct nft_set_gc_batch *gcb;
3986 unsigned int i;
3987
3988 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
3989 for (i = 0; i < gcb->head.cnt; i++)
3990 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
3991 kfree(gcb);
3992 }
3993 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
3994
3995 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
3996 gfp_t gfp)
3997 {
3998 struct nft_set_gc_batch *gcb;
3999
4000 gcb = kzalloc(sizeof(*gcb), gfp);
4001 if (gcb == NULL)
4002 return gcb;
4003 gcb->head.set = set;
4004 return gcb;
4005 }
4006 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4007
4008 /*
4009 * Stateful objects
4010 */
4011
4012 /**
4013 * nft_register_obj- register nf_tables stateful object type
4014 * @obj: object type
4015 *
4016 * Registers the object type for use with nf_tables. Returns zero on
4017 * success or a negative errno code otherwise.
4018 */
4019 int nft_register_obj(struct nft_object_type *obj_type)
4020 {
4021 if (obj_type->type == NFT_OBJECT_UNSPEC)
4022 return -EINVAL;
4023
4024 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4025 list_add_rcu(&obj_type->list, &nf_tables_objects);
4026 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4027 return 0;
4028 }
4029 EXPORT_SYMBOL_GPL(nft_register_obj);
4030
4031 /**
4032 * nft_unregister_obj - unregister nf_tables object type
4033 * @obj: object type
4034 *
4035 * Unregisters the object type for use with nf_tables.
4036 */
4037 void nft_unregister_obj(struct nft_object_type *obj_type)
4038 {
4039 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4040 list_del_rcu(&obj_type->list);
4041 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4042 }
4043 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4044
4045 struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
4046 const struct nlattr *nla,
4047 u32 objtype, u8 genmask)
4048 {
4049 struct nft_object *obj;
4050
4051 list_for_each_entry(obj, &table->objects, list) {
4052 if (!nla_strcmp(nla, obj->name) &&
4053 objtype == obj->type->type &&
4054 nft_active_genmask(obj, genmask))
4055 return obj;
4056 }
4057 return ERR_PTR(-ENOENT);
4058 }
4059 EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
4060
4061 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4062 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4063 .len = NFT_TABLE_MAXNAMELEN - 1 },
4064 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4065 .len = NFT_OBJ_MAXNAMELEN - 1 },
4066 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4067 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4068 };
4069
4070 static struct nft_object *nft_obj_init(const struct nft_object_type *type,
4071 const struct nlattr *attr)
4072 {
4073 struct nlattr *tb[type->maxattr + 1];
4074 struct nft_object *obj;
4075 int err;
4076
4077 if (attr) {
4078 err = nla_parse_nested(tb, type->maxattr, attr, type->policy);
4079 if (err < 0)
4080 goto err1;
4081 } else {
4082 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4083 }
4084
4085 err = -ENOMEM;
4086 obj = kzalloc(sizeof(struct nft_object) + type->size, GFP_KERNEL);
4087 if (obj == NULL)
4088 goto err1;
4089
4090 err = type->init((const struct nlattr * const *)tb, obj);
4091 if (err < 0)
4092 goto err2;
4093
4094 obj->type = type;
4095 return obj;
4096 err2:
4097 kfree(obj);
4098 err1:
4099 return ERR_PTR(err);
4100 }
4101
4102 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
4103 struct nft_object *obj, bool reset)
4104 {
4105 struct nlattr *nest;
4106
4107 nest = nla_nest_start(skb, attr);
4108 if (!nest)
4109 goto nla_put_failure;
4110 if (obj->type->dump(skb, obj, reset) < 0)
4111 goto nla_put_failure;
4112 nla_nest_end(skb, nest);
4113 return 0;
4114
4115 nla_put_failure:
4116 return -1;
4117 }
4118
4119 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4120 {
4121 const struct nft_object_type *type;
4122
4123 list_for_each_entry(type, &nf_tables_objects, list) {
4124 if (objtype == type->type)
4125 return type;
4126 }
4127 return NULL;
4128 }
4129
4130 static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4131 {
4132 const struct nft_object_type *type;
4133
4134 type = __nft_obj_type_get(objtype);
4135 if (type != NULL && try_module_get(type->owner))
4136 return type;
4137
4138 #ifdef CONFIG_MODULES
4139 if (type == NULL) {
4140 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4141 request_module("nft-obj-%u", objtype);
4142 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4143 if (__nft_obj_type_get(objtype))
4144 return ERR_PTR(-EAGAIN);
4145 }
4146 #endif
4147 return ERR_PTR(-ENOENT);
4148 }
4149
4150 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4151 struct sk_buff *skb, const struct nlmsghdr *nlh,
4152 const struct nlattr * const nla[])
4153 {
4154 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4155 const struct nft_object_type *type;
4156 u8 genmask = nft_genmask_next(net);
4157 int family = nfmsg->nfgen_family;
4158 struct nft_af_info *afi;
4159 struct nft_table *table;
4160 struct nft_object *obj;
4161 struct nft_ctx ctx;
4162 u32 objtype;
4163 int err;
4164
4165 if (!nla[NFTA_OBJ_TYPE] ||
4166 !nla[NFTA_OBJ_NAME] ||
4167 !nla[NFTA_OBJ_DATA])
4168 return -EINVAL;
4169
4170 afi = nf_tables_afinfo_lookup(net, family, true);
4171 if (IS_ERR(afi))
4172 return PTR_ERR(afi);
4173
4174 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4175 if (IS_ERR(table))
4176 return PTR_ERR(table);
4177
4178 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4179 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4180 if (IS_ERR(obj)) {
4181 err = PTR_ERR(obj);
4182 if (err != -ENOENT)
4183 return err;
4184
4185 } else {
4186 if (nlh->nlmsg_flags & NLM_F_EXCL)
4187 return -EEXIST;
4188
4189 return 0;
4190 }
4191
4192 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4193
4194 type = nft_obj_type_get(objtype);
4195 if (IS_ERR(type))
4196 return PTR_ERR(type);
4197
4198 obj = nft_obj_init(type, nla[NFTA_OBJ_DATA]);
4199 if (IS_ERR(obj)) {
4200 err = PTR_ERR(obj);
4201 goto err1;
4202 }
4203 obj->table = table;
4204 nla_strlcpy(obj->name, nla[NFTA_OBJ_NAME], NFT_OBJ_MAXNAMELEN);
4205
4206 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4207 if (err < 0)
4208 goto err2;
4209
4210 list_add_tail_rcu(&obj->list, &table->objects);
4211 table->use++;
4212 return 0;
4213 err2:
4214 if (obj->type->destroy)
4215 obj->type->destroy(obj);
4216 kfree(obj);
4217 err1:
4218 module_put(type->owner);
4219 return err;
4220 }
4221
4222 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4223 u32 portid, u32 seq, int event, u32 flags,
4224 int family, const struct nft_table *table,
4225 struct nft_object *obj, bool reset)
4226 {
4227 struct nfgenmsg *nfmsg;
4228 struct nlmsghdr *nlh;
4229
4230 event |= NFNL_SUBSYS_NFTABLES << 8;
4231 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4232 if (nlh == NULL)
4233 goto nla_put_failure;
4234
4235 nfmsg = nlmsg_data(nlh);
4236 nfmsg->nfgen_family = family;
4237 nfmsg->version = NFNETLINK_V0;
4238 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4239
4240 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4241 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
4242 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->type->type)) ||
4243 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
4244 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
4245 goto nla_put_failure;
4246
4247 nlmsg_end(skb, nlh);
4248 return 0;
4249
4250 nla_put_failure:
4251 nlmsg_trim(skb, nlh);
4252 return -1;
4253 }
4254
4255 struct nft_obj_filter {
4256 char table[NFT_OBJ_MAXNAMELEN];
4257 u32 type;
4258 };
4259
4260 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4261 {
4262 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4263 const struct nft_af_info *afi;
4264 const struct nft_table *table;
4265 unsigned int idx = 0, s_idx = cb->args[0];
4266 struct nft_obj_filter *filter = cb->data;
4267 struct net *net = sock_net(skb->sk);
4268 int family = nfmsg->nfgen_family;
4269 struct nft_object *obj;
4270 bool reset = false;
4271
4272 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4273 reset = true;
4274
4275 rcu_read_lock();
4276 cb->seq = net->nft.base_seq;
4277
4278 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
4279 if (family != NFPROTO_UNSPEC && family != afi->family)
4280 continue;
4281
4282 list_for_each_entry_rcu(table, &afi->tables, list) {
4283 list_for_each_entry_rcu(obj, &table->objects, list) {
4284 if (!nft_is_active(net, obj))
4285 goto cont;
4286 if (idx < s_idx)
4287 goto cont;
4288 if (idx > s_idx)
4289 memset(&cb->args[1], 0,
4290 sizeof(cb->args) - sizeof(cb->args[0]));
4291 if (filter && filter->table[0] &&
4292 strcmp(filter->table, table->name))
4293 goto cont;
4294 if (filter &&
4295 filter->type != NFT_OBJECT_UNSPEC &&
4296 obj->type->type != filter->type)
4297 goto cont;
4298
4299 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4300 cb->nlh->nlmsg_seq,
4301 NFT_MSG_NEWOBJ,
4302 NLM_F_MULTI | NLM_F_APPEND,
4303 afi->family, table, obj, reset) < 0)
4304 goto done;
4305
4306 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4307 cont:
4308 idx++;
4309 }
4310 }
4311 }
4312 done:
4313 rcu_read_unlock();
4314
4315 cb->args[0] = idx;
4316 return skb->len;
4317 }
4318
4319 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4320 {
4321 kfree(cb->data);
4322
4323 return 0;
4324 }
4325
4326 static struct nft_obj_filter *
4327 nft_obj_filter_alloc(const struct nlattr * const nla[])
4328 {
4329 struct nft_obj_filter *filter;
4330
4331 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
4332 if (!filter)
4333 return ERR_PTR(-ENOMEM);
4334
4335 if (nla[NFTA_OBJ_TABLE])
4336 nla_strlcpy(filter->table, nla[NFTA_OBJ_TABLE],
4337 NFT_TABLE_MAXNAMELEN);
4338 if (nla[NFTA_OBJ_TYPE])
4339 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4340
4341 return filter;
4342 }
4343
4344 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
4345 struct sk_buff *skb, const struct nlmsghdr *nlh,
4346 const struct nlattr * const nla[])
4347 {
4348 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4349 u8 genmask = nft_genmask_cur(net);
4350 int family = nfmsg->nfgen_family;
4351 const struct nft_af_info *afi;
4352 const struct nft_table *table;
4353 struct nft_object *obj;
4354 struct sk_buff *skb2;
4355 bool reset = false;
4356 u32 objtype;
4357 int err;
4358
4359 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4360 struct netlink_dump_control c = {
4361 .dump = nf_tables_dump_obj,
4362 .done = nf_tables_dump_obj_done,
4363 };
4364
4365 if (nla[NFTA_OBJ_TABLE] ||
4366 nla[NFTA_OBJ_TYPE]) {
4367 struct nft_obj_filter *filter;
4368
4369 filter = nft_obj_filter_alloc(nla);
4370 if (IS_ERR(filter))
4371 return -ENOMEM;
4372
4373 c.data = filter;
4374 }
4375 return netlink_dump_start(nlsk, skb, nlh, &c);
4376 }
4377
4378 if (!nla[NFTA_OBJ_NAME] ||
4379 !nla[NFTA_OBJ_TYPE])
4380 return -EINVAL;
4381
4382 afi = nf_tables_afinfo_lookup(net, family, false);
4383 if (IS_ERR(afi))
4384 return PTR_ERR(afi);
4385
4386 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4387 if (IS_ERR(table))
4388 return PTR_ERR(table);
4389
4390 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4391 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4392 if (IS_ERR(obj))
4393 return PTR_ERR(obj);
4394
4395 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4396 if (!skb2)
4397 return -ENOMEM;
4398
4399 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4400 reset = true;
4401
4402 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
4403 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
4404 family, table, obj, reset);
4405 if (err < 0)
4406 goto err;
4407
4408 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4409 err:
4410 kfree_skb(skb2);
4411 return err;
4412
4413 return 0;
4414 }
4415
4416 static void nft_obj_destroy(struct nft_object *obj)
4417 {
4418 if (obj->type->destroy)
4419 obj->type->destroy(obj);
4420
4421 module_put(obj->type->owner);
4422 kfree(obj);
4423 }
4424
4425 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
4426 struct sk_buff *skb, const struct nlmsghdr *nlh,
4427 const struct nlattr * const nla[])
4428 {
4429 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4430 u8 genmask = nft_genmask_next(net);
4431 int family = nfmsg->nfgen_family;
4432 struct nft_af_info *afi;
4433 struct nft_table *table;
4434 struct nft_object *obj;
4435 struct nft_ctx ctx;
4436 u32 objtype;
4437
4438 if (!nla[NFTA_OBJ_TYPE] ||
4439 !nla[NFTA_OBJ_NAME])
4440 return -EINVAL;
4441
4442 afi = nf_tables_afinfo_lookup(net, family, true);
4443 if (IS_ERR(afi))
4444 return PTR_ERR(afi);
4445
4446 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4447 if (IS_ERR(table))
4448 return PTR_ERR(table);
4449
4450 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4451 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4452 if (IS_ERR(obj))
4453 return PTR_ERR(obj);
4454 if (obj->use > 0)
4455 return -EBUSY;
4456
4457 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4458
4459 return nft_delobj(&ctx, obj);
4460 }
4461
4462 void nft_obj_notify(struct net *net, struct nft_table *table,
4463 struct nft_object *obj, u32 portid, u32 seq, int event,
4464 int family, int report, gfp_t gfp)
4465 {
4466 struct sk_buff *skb;
4467 int err;
4468
4469 if (!report &&
4470 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4471 return;
4472
4473 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
4474 if (skb == NULL)
4475 goto err;
4476
4477 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
4478 table, obj, false);
4479 if (err < 0) {
4480 kfree_skb(skb);
4481 goto err;
4482 }
4483
4484 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
4485 return;
4486 err:
4487 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4488 }
4489 EXPORT_SYMBOL_GPL(nft_obj_notify);
4490
4491 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
4492 struct nft_object *obj, int event)
4493 {
4494 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
4495 ctx->afi->family, ctx->report, GFP_KERNEL);
4496 }
4497
4498 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
4499 u32 portid, u32 seq)
4500 {
4501 struct nlmsghdr *nlh;
4502 struct nfgenmsg *nfmsg;
4503 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
4504
4505 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
4506 if (nlh == NULL)
4507 goto nla_put_failure;
4508
4509 nfmsg = nlmsg_data(nlh);
4510 nfmsg->nfgen_family = AF_UNSPEC;
4511 nfmsg->version = NFNETLINK_V0;
4512 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4513
4514 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
4515 goto nla_put_failure;
4516
4517 nlmsg_end(skb, nlh);
4518 return 0;
4519
4520 nla_put_failure:
4521 nlmsg_trim(skb, nlh);
4522 return -EMSGSIZE;
4523 }
4524
4525 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
4526 int event)
4527 {
4528 struct nlmsghdr *nlh = nlmsg_hdr(skb);
4529 struct sk_buff *skb2;
4530 int err;
4531
4532 if (nlmsg_report(nlh) &&
4533 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4534 return;
4535
4536 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4537 if (skb2 == NULL)
4538 goto err;
4539
4540 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4541 nlh->nlmsg_seq);
4542 if (err < 0) {
4543 kfree_skb(skb2);
4544 goto err;
4545 }
4546
4547 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4548 nlmsg_report(nlh), GFP_KERNEL);
4549 return;
4550 err:
4551 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4552 -ENOBUFS);
4553 }
4554
4555 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
4556 struct sk_buff *skb, const struct nlmsghdr *nlh,
4557 const struct nlattr * const nla[])
4558 {
4559 struct sk_buff *skb2;
4560 int err;
4561
4562 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4563 if (skb2 == NULL)
4564 return -ENOMEM;
4565
4566 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4567 nlh->nlmsg_seq);
4568 if (err < 0)
4569 goto err;
4570
4571 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4572 err:
4573 kfree_skb(skb2);
4574 return err;
4575 }
4576
4577 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
4578 [NFT_MSG_NEWTABLE] = {
4579 .call_batch = nf_tables_newtable,
4580 .attr_count = NFTA_TABLE_MAX,
4581 .policy = nft_table_policy,
4582 },
4583 [NFT_MSG_GETTABLE] = {
4584 .call = nf_tables_gettable,
4585 .attr_count = NFTA_TABLE_MAX,
4586 .policy = nft_table_policy,
4587 },
4588 [NFT_MSG_DELTABLE] = {
4589 .call_batch = nf_tables_deltable,
4590 .attr_count = NFTA_TABLE_MAX,
4591 .policy = nft_table_policy,
4592 },
4593 [NFT_MSG_NEWCHAIN] = {
4594 .call_batch = nf_tables_newchain,
4595 .attr_count = NFTA_CHAIN_MAX,
4596 .policy = nft_chain_policy,
4597 },
4598 [NFT_MSG_GETCHAIN] = {
4599 .call = nf_tables_getchain,
4600 .attr_count = NFTA_CHAIN_MAX,
4601 .policy = nft_chain_policy,
4602 },
4603 [NFT_MSG_DELCHAIN] = {
4604 .call_batch = nf_tables_delchain,
4605 .attr_count = NFTA_CHAIN_MAX,
4606 .policy = nft_chain_policy,
4607 },
4608 [NFT_MSG_NEWRULE] = {
4609 .call_batch = nf_tables_newrule,
4610 .attr_count = NFTA_RULE_MAX,
4611 .policy = nft_rule_policy,
4612 },
4613 [NFT_MSG_GETRULE] = {
4614 .call = nf_tables_getrule,
4615 .attr_count = NFTA_RULE_MAX,
4616 .policy = nft_rule_policy,
4617 },
4618 [NFT_MSG_DELRULE] = {
4619 .call_batch = nf_tables_delrule,
4620 .attr_count = NFTA_RULE_MAX,
4621 .policy = nft_rule_policy,
4622 },
4623 [NFT_MSG_NEWSET] = {
4624 .call_batch = nf_tables_newset,
4625 .attr_count = NFTA_SET_MAX,
4626 .policy = nft_set_policy,
4627 },
4628 [NFT_MSG_GETSET] = {
4629 .call = nf_tables_getset,
4630 .attr_count = NFTA_SET_MAX,
4631 .policy = nft_set_policy,
4632 },
4633 [NFT_MSG_DELSET] = {
4634 .call_batch = nf_tables_delset,
4635 .attr_count = NFTA_SET_MAX,
4636 .policy = nft_set_policy,
4637 },
4638 [NFT_MSG_NEWSETELEM] = {
4639 .call_batch = nf_tables_newsetelem,
4640 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4641 .policy = nft_set_elem_list_policy,
4642 },
4643 [NFT_MSG_GETSETELEM] = {
4644 .call = nf_tables_getsetelem,
4645 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4646 .policy = nft_set_elem_list_policy,
4647 },
4648 [NFT_MSG_DELSETELEM] = {
4649 .call_batch = nf_tables_delsetelem,
4650 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4651 .policy = nft_set_elem_list_policy,
4652 },
4653 [NFT_MSG_GETGEN] = {
4654 .call = nf_tables_getgen,
4655 },
4656 [NFT_MSG_NEWOBJ] = {
4657 .call_batch = nf_tables_newobj,
4658 .attr_count = NFTA_OBJ_MAX,
4659 .policy = nft_obj_policy,
4660 },
4661 [NFT_MSG_GETOBJ] = {
4662 .call = nf_tables_getobj,
4663 .attr_count = NFTA_OBJ_MAX,
4664 .policy = nft_obj_policy,
4665 },
4666 [NFT_MSG_DELOBJ] = {
4667 .call_batch = nf_tables_delobj,
4668 .attr_count = NFTA_OBJ_MAX,
4669 .policy = nft_obj_policy,
4670 },
4671 [NFT_MSG_GETOBJ_RESET] = {
4672 .call = nf_tables_getobj,
4673 .attr_count = NFTA_OBJ_MAX,
4674 .policy = nft_obj_policy,
4675 },
4676 };
4677
4678 static void nft_chain_commit_update(struct nft_trans *trans)
4679 {
4680 struct nft_base_chain *basechain;
4681
4682 if (nft_trans_chain_name(trans)[0])
4683 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
4684
4685 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
4686 return;
4687
4688 basechain = nft_base_chain(trans->ctx.chain);
4689 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
4690
4691 switch (nft_trans_chain_policy(trans)) {
4692 case NF_DROP:
4693 case NF_ACCEPT:
4694 basechain->policy = nft_trans_chain_policy(trans);
4695 break;
4696 }
4697 }
4698
4699 static void nf_tables_commit_release(struct nft_trans *trans)
4700 {
4701 switch (trans->msg_type) {
4702 case NFT_MSG_DELTABLE:
4703 nf_tables_table_destroy(&trans->ctx);
4704 break;
4705 case NFT_MSG_DELCHAIN:
4706 nf_tables_chain_destroy(trans->ctx.chain);
4707 break;
4708 case NFT_MSG_DELRULE:
4709 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4710 break;
4711 case NFT_MSG_DELSET:
4712 nft_set_destroy(nft_trans_set(trans));
4713 break;
4714 case NFT_MSG_DELSETELEM:
4715 nft_set_elem_destroy(nft_trans_elem_set(trans),
4716 nft_trans_elem(trans).priv, true);
4717 break;
4718 case NFT_MSG_DELOBJ:
4719 nft_obj_destroy(nft_trans_obj(trans));
4720 break;
4721 }
4722 kfree(trans);
4723 }
4724
4725 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
4726 {
4727 struct nft_trans *trans, *next;
4728 struct nft_trans_elem *te;
4729
4730 /* Bump generation counter, invalidate any dump in progress */
4731 while (++net->nft.base_seq == 0);
4732
4733 /* A new generation has just started */
4734 net->nft.gencursor = nft_gencursor_next(net);
4735
4736 /* Make sure all packets have left the previous generation before
4737 * purging old rules.
4738 */
4739 synchronize_rcu();
4740
4741 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4742 switch (trans->msg_type) {
4743 case NFT_MSG_NEWTABLE:
4744 if (nft_trans_table_update(trans)) {
4745 if (!nft_trans_table_enable(trans)) {
4746 nf_tables_table_disable(net,
4747 trans->ctx.afi,
4748 trans->ctx.table);
4749 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4750 }
4751 } else {
4752 nft_clear(net, trans->ctx.table);
4753 }
4754 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
4755 nft_trans_destroy(trans);
4756 break;
4757 case NFT_MSG_DELTABLE:
4758 list_del_rcu(&trans->ctx.table->list);
4759 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
4760 break;
4761 case NFT_MSG_NEWCHAIN:
4762 if (nft_trans_chain_update(trans))
4763 nft_chain_commit_update(trans);
4764 else
4765 nft_clear(net, trans->ctx.chain);
4766
4767 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
4768 nft_trans_destroy(trans);
4769 break;
4770 case NFT_MSG_DELCHAIN:
4771 list_del_rcu(&trans->ctx.chain->list);
4772 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
4773 nf_tables_unregister_hooks(trans->ctx.net,
4774 trans->ctx.table,
4775 trans->ctx.chain,
4776 trans->ctx.afi->nops);
4777 break;
4778 case NFT_MSG_NEWRULE:
4779 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4780 nf_tables_rule_notify(&trans->ctx,
4781 nft_trans_rule(trans),
4782 NFT_MSG_NEWRULE);
4783 nft_trans_destroy(trans);
4784 break;
4785 case NFT_MSG_DELRULE:
4786 list_del_rcu(&nft_trans_rule(trans)->list);
4787 nf_tables_rule_notify(&trans->ctx,
4788 nft_trans_rule(trans),
4789 NFT_MSG_DELRULE);
4790 break;
4791 case NFT_MSG_NEWSET:
4792 nft_clear(net, nft_trans_set(trans));
4793 /* This avoids hitting -EBUSY when deleting the table
4794 * from the transaction.
4795 */
4796 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4797 !list_empty(&nft_trans_set(trans)->bindings))
4798 trans->ctx.table->use--;
4799
4800 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4801 NFT_MSG_NEWSET, GFP_KERNEL);
4802 nft_trans_destroy(trans);
4803 break;
4804 case NFT_MSG_DELSET:
4805 list_del_rcu(&nft_trans_set(trans)->list);
4806 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4807 NFT_MSG_DELSET, GFP_KERNEL);
4808 break;
4809 case NFT_MSG_NEWSETELEM:
4810 te = (struct nft_trans_elem *)trans->data;
4811
4812 te->set->ops->activate(net, te->set, &te->elem);
4813 nf_tables_setelem_notify(&trans->ctx, te->set,
4814 &te->elem,
4815 NFT_MSG_NEWSETELEM, 0);
4816 nft_trans_destroy(trans);
4817 break;
4818 case NFT_MSG_DELSETELEM:
4819 te = (struct nft_trans_elem *)trans->data;
4820
4821 nf_tables_setelem_notify(&trans->ctx, te->set,
4822 &te->elem,
4823 NFT_MSG_DELSETELEM, 0);
4824 te->set->ops->remove(net, te->set, &te->elem);
4825 atomic_dec(&te->set->nelems);
4826 te->set->ndeact--;
4827 break;
4828 case NFT_MSG_NEWOBJ:
4829 nft_clear(net, nft_trans_obj(trans));
4830 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4831 NFT_MSG_NEWOBJ);
4832 nft_trans_destroy(trans);
4833 break;
4834 case NFT_MSG_DELOBJ:
4835 list_del_rcu(&nft_trans_obj(trans)->list);
4836 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4837 NFT_MSG_DELOBJ);
4838 break;
4839 }
4840 }
4841
4842 synchronize_rcu();
4843
4844 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4845 list_del(&trans->list);
4846 nf_tables_commit_release(trans);
4847 }
4848
4849 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
4850
4851 return 0;
4852 }
4853
4854 static void nf_tables_abort_release(struct nft_trans *trans)
4855 {
4856 switch (trans->msg_type) {
4857 case NFT_MSG_NEWTABLE:
4858 nf_tables_table_destroy(&trans->ctx);
4859 break;
4860 case NFT_MSG_NEWCHAIN:
4861 nf_tables_chain_destroy(trans->ctx.chain);
4862 break;
4863 case NFT_MSG_NEWRULE:
4864 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4865 break;
4866 case NFT_MSG_NEWSET:
4867 nft_set_destroy(nft_trans_set(trans));
4868 break;
4869 case NFT_MSG_NEWSETELEM:
4870 nft_set_elem_destroy(nft_trans_elem_set(trans),
4871 nft_trans_elem(trans).priv, true);
4872 break;
4873 case NFT_MSG_NEWOBJ:
4874 nft_obj_destroy(nft_trans_obj(trans));
4875 break;
4876 }
4877 kfree(trans);
4878 }
4879
4880 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
4881 {
4882 struct nft_trans *trans, *next;
4883 struct nft_trans_elem *te;
4884
4885 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4886 list) {
4887 switch (trans->msg_type) {
4888 case NFT_MSG_NEWTABLE:
4889 if (nft_trans_table_update(trans)) {
4890 if (nft_trans_table_enable(trans)) {
4891 nf_tables_table_disable(net,
4892 trans->ctx.afi,
4893 trans->ctx.table);
4894 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4895 }
4896 nft_trans_destroy(trans);
4897 } else {
4898 list_del_rcu(&trans->ctx.table->list);
4899 }
4900 break;
4901 case NFT_MSG_DELTABLE:
4902 nft_clear(trans->ctx.net, trans->ctx.table);
4903 nft_trans_destroy(trans);
4904 break;
4905 case NFT_MSG_NEWCHAIN:
4906 if (nft_trans_chain_update(trans)) {
4907 free_percpu(nft_trans_chain_stats(trans));
4908
4909 nft_trans_destroy(trans);
4910 } else {
4911 trans->ctx.table->use--;
4912 list_del_rcu(&trans->ctx.chain->list);
4913 nf_tables_unregister_hooks(trans->ctx.net,
4914 trans->ctx.table,
4915 trans->ctx.chain,
4916 trans->ctx.afi->nops);
4917 }
4918 break;
4919 case NFT_MSG_DELCHAIN:
4920 trans->ctx.table->use++;
4921 nft_clear(trans->ctx.net, trans->ctx.chain);
4922 nft_trans_destroy(trans);
4923 break;
4924 case NFT_MSG_NEWRULE:
4925 trans->ctx.chain->use--;
4926 list_del_rcu(&nft_trans_rule(trans)->list);
4927 break;
4928 case NFT_MSG_DELRULE:
4929 trans->ctx.chain->use++;
4930 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4931 nft_trans_destroy(trans);
4932 break;
4933 case NFT_MSG_NEWSET:
4934 trans->ctx.table->use--;
4935 list_del_rcu(&nft_trans_set(trans)->list);
4936 break;
4937 case NFT_MSG_DELSET:
4938 trans->ctx.table->use++;
4939 nft_clear(trans->ctx.net, nft_trans_set(trans));
4940 nft_trans_destroy(trans);
4941 break;
4942 case NFT_MSG_NEWSETELEM:
4943 te = (struct nft_trans_elem *)trans->data;
4944
4945 te->set->ops->remove(net, te->set, &te->elem);
4946 atomic_dec(&te->set->nelems);
4947 break;
4948 case NFT_MSG_DELSETELEM:
4949 te = (struct nft_trans_elem *)trans->data;
4950
4951 te->set->ops->activate(net, te->set, &te->elem);
4952 te->set->ndeact--;
4953
4954 nft_trans_destroy(trans);
4955 break;
4956 case NFT_MSG_NEWOBJ:
4957 trans->ctx.table->use--;
4958 list_del_rcu(&nft_trans_obj(trans)->list);
4959 break;
4960 case NFT_MSG_DELOBJ:
4961 trans->ctx.table->use++;
4962 nft_clear(trans->ctx.net, nft_trans_obj(trans));
4963 nft_trans_destroy(trans);
4964 break;
4965 }
4966 }
4967
4968 synchronize_rcu();
4969
4970 list_for_each_entry_safe_reverse(trans, next,
4971 &net->nft.commit_list, list) {
4972 list_del(&trans->list);
4973 nf_tables_abort_release(trans);
4974 }
4975
4976 return 0;
4977 }
4978
4979 static bool nf_tables_valid_genid(struct net *net, u32 genid)
4980 {
4981 return net->nft.base_seq == genid;
4982 }
4983
4984 static const struct nfnetlink_subsystem nf_tables_subsys = {
4985 .name = "nf_tables",
4986 .subsys_id = NFNL_SUBSYS_NFTABLES,
4987 .cb_count = NFT_MSG_MAX,
4988 .cb = nf_tables_cb,
4989 .commit = nf_tables_commit,
4990 .abort = nf_tables_abort,
4991 .valid_genid = nf_tables_valid_genid,
4992 };
4993
4994 int nft_chain_validate_dependency(const struct nft_chain *chain,
4995 enum nft_chain_type type)
4996 {
4997 const struct nft_base_chain *basechain;
4998
4999 if (chain->flags & NFT_BASE_CHAIN) {
5000 basechain = nft_base_chain(chain);
5001 if (basechain->type->type != type)
5002 return -EOPNOTSUPP;
5003 }
5004 return 0;
5005 }
5006 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
5007
5008 int nft_chain_validate_hooks(const struct nft_chain *chain,
5009 unsigned int hook_flags)
5010 {
5011 struct nft_base_chain *basechain;
5012
5013 if (chain->flags & NFT_BASE_CHAIN) {
5014 basechain = nft_base_chain(chain);
5015
5016 if ((1 << basechain->ops[0].hooknum) & hook_flags)
5017 return 0;
5018
5019 return -EOPNOTSUPP;
5020 }
5021
5022 return 0;
5023 }
5024 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
5025
5026 /*
5027 * Loop detection - walk through the ruleset beginning at the destination chain
5028 * of a new jump until either the source chain is reached (loop) or all
5029 * reachable chains have been traversed.
5030 *
5031 * The loop check is performed whenever a new jump verdict is added to an
5032 * expression or verdict map or a verdict map is bound to a new chain.
5033 */
5034
5035 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5036 const struct nft_chain *chain);
5037
5038 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
5039 struct nft_set *set,
5040 const struct nft_set_iter *iter,
5041 struct nft_set_elem *elem)
5042 {
5043 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5044 const struct nft_data *data;
5045
5046 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5047 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
5048 return 0;
5049
5050 data = nft_set_ext_data(ext);
5051 switch (data->verdict.code) {
5052 case NFT_JUMP:
5053 case NFT_GOTO:
5054 return nf_tables_check_loops(ctx, data->verdict.chain);
5055 default:
5056 return 0;
5057 }
5058 }
5059
5060 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5061 const struct nft_chain *chain)
5062 {
5063 const struct nft_rule *rule;
5064 const struct nft_expr *expr, *last;
5065 struct nft_set *set;
5066 struct nft_set_binding *binding;
5067 struct nft_set_iter iter;
5068
5069 if (ctx->chain == chain)
5070 return -ELOOP;
5071
5072 list_for_each_entry(rule, &chain->rules, list) {
5073 nft_rule_for_each_expr(expr, last, rule) {
5074 const struct nft_data *data = NULL;
5075 int err;
5076
5077 if (!expr->ops->validate)
5078 continue;
5079
5080 err = expr->ops->validate(ctx, expr, &data);
5081 if (err < 0)
5082 return err;
5083
5084 if (data == NULL)
5085 continue;
5086
5087 switch (data->verdict.code) {
5088 case NFT_JUMP:
5089 case NFT_GOTO:
5090 err = nf_tables_check_loops(ctx,
5091 data->verdict.chain);
5092 if (err < 0)
5093 return err;
5094 default:
5095 break;
5096 }
5097 }
5098 }
5099
5100 list_for_each_entry(set, &ctx->table->sets, list) {
5101 if (!nft_is_active_next(ctx->net, set))
5102 continue;
5103 if (!(set->flags & NFT_SET_MAP) ||
5104 set->dtype != NFT_DATA_VERDICT)
5105 continue;
5106
5107 list_for_each_entry(binding, &set->bindings, list) {
5108 if (!(binding->flags & NFT_SET_MAP) ||
5109 binding->chain != chain)
5110 continue;
5111
5112 iter.genmask = nft_genmask_next(ctx->net);
5113 iter.skip = 0;
5114 iter.count = 0;
5115 iter.err = 0;
5116 iter.fn = nf_tables_loop_check_setelem;
5117 iter.flush = false;
5118
5119 set->ops->walk(ctx, set, &iter);
5120 if (iter.err < 0)
5121 return iter.err;
5122 }
5123 }
5124
5125 return 0;
5126 }
5127
5128 /**
5129 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
5130 *
5131 * @attr: netlink attribute to fetch value from
5132 * @max: maximum value to be stored in dest
5133 * @dest: pointer to the variable
5134 *
5135 * Parse, check and store a given u32 netlink attribute into variable.
5136 * This function returns -ERANGE if the value goes over maximum value.
5137 * Otherwise a 0 is returned and the attribute value is stored in the
5138 * destination variable.
5139 */
5140 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
5141 {
5142 u32 val;
5143
5144 val = ntohl(nla_get_be32(attr));
5145 if (val > max)
5146 return -ERANGE;
5147
5148 *dest = val;
5149 return 0;
5150 }
5151 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
5152
5153 /**
5154 * nft_parse_register - parse a register value from a netlink attribute
5155 *
5156 * @attr: netlink attribute
5157 *
5158 * Parse and translate a register value from a netlink attribute.
5159 * Registers used to be 128 bit wide, these register numbers will be
5160 * mapped to the corresponding 32 bit register numbers.
5161 */
5162 unsigned int nft_parse_register(const struct nlattr *attr)
5163 {
5164 unsigned int reg;
5165
5166 reg = ntohl(nla_get_be32(attr));
5167 switch (reg) {
5168 case NFT_REG_VERDICT...NFT_REG_4:
5169 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
5170 default:
5171 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
5172 }
5173 }
5174 EXPORT_SYMBOL_GPL(nft_parse_register);
5175
5176 /**
5177 * nft_dump_register - dump a register value to a netlink attribute
5178 *
5179 * @skb: socket buffer
5180 * @attr: attribute number
5181 * @reg: register number
5182 *
5183 * Construct a netlink attribute containing the register number. For
5184 * compatibility reasons, register numbers being a multiple of 4 are
5185 * translated to the corresponding 128 bit register numbers.
5186 */
5187 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
5188 {
5189 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
5190 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
5191 else
5192 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
5193
5194 return nla_put_be32(skb, attr, htonl(reg));
5195 }
5196 EXPORT_SYMBOL_GPL(nft_dump_register);
5197
5198 /**
5199 * nft_validate_register_load - validate a load from a register
5200 *
5201 * @reg: the register number
5202 * @len: the length of the data
5203 *
5204 * Validate that the input register is one of the general purpose
5205 * registers and that the length of the load is within the bounds.
5206 */
5207 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
5208 {
5209 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5210 return -EINVAL;
5211 if (len == 0)
5212 return -EINVAL;
5213 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
5214 return -ERANGE;
5215
5216 return 0;
5217 }
5218 EXPORT_SYMBOL_GPL(nft_validate_register_load);
5219
5220 /**
5221 * nft_validate_register_store - validate an expressions' register store
5222 *
5223 * @ctx: context of the expression performing the load
5224 * @reg: the destination register number
5225 * @data: the data to load
5226 * @type: the data type
5227 * @len: the length of the data
5228 *
5229 * Validate that a data load uses the appropriate data type for
5230 * the destination register and the length is within the bounds.
5231 * A value of NULL for the data means that its runtime gathered
5232 * data.
5233 */
5234 int nft_validate_register_store(const struct nft_ctx *ctx,
5235 enum nft_registers reg,
5236 const struct nft_data *data,
5237 enum nft_data_types type, unsigned int len)
5238 {
5239 int err;
5240
5241 switch (reg) {
5242 case NFT_REG_VERDICT:
5243 if (type != NFT_DATA_VERDICT)
5244 return -EINVAL;
5245
5246 if (data != NULL &&
5247 (data->verdict.code == NFT_GOTO ||
5248 data->verdict.code == NFT_JUMP)) {
5249 err = nf_tables_check_loops(ctx, data->verdict.chain);
5250 if (err < 0)
5251 return err;
5252
5253 if (ctx->chain->level + 1 >
5254 data->verdict.chain->level) {
5255 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
5256 return -EMLINK;
5257 data->verdict.chain->level = ctx->chain->level + 1;
5258 }
5259 }
5260
5261 return 0;
5262 default:
5263 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5264 return -EINVAL;
5265 if (len == 0)
5266 return -EINVAL;
5267 if (reg * NFT_REG32_SIZE + len >
5268 FIELD_SIZEOF(struct nft_regs, data))
5269 return -ERANGE;
5270
5271 if (data != NULL && type != NFT_DATA_VALUE)
5272 return -EINVAL;
5273 return 0;
5274 }
5275 }
5276 EXPORT_SYMBOL_GPL(nft_validate_register_store);
5277
5278 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
5279 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
5280 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
5281 .len = NFT_CHAIN_MAXNAMELEN - 1 },
5282 };
5283
5284 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
5285 struct nft_data_desc *desc, const struct nlattr *nla)
5286 {
5287 u8 genmask = nft_genmask_next(ctx->net);
5288 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
5289 struct nft_chain *chain;
5290 int err;
5291
5292 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
5293 if (err < 0)
5294 return err;
5295
5296 if (!tb[NFTA_VERDICT_CODE])
5297 return -EINVAL;
5298 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
5299
5300 switch (data->verdict.code) {
5301 default:
5302 switch (data->verdict.code & NF_VERDICT_MASK) {
5303 case NF_ACCEPT:
5304 case NF_DROP:
5305 case NF_QUEUE:
5306 break;
5307 default:
5308 return -EINVAL;
5309 }
5310 /* fall through */
5311 case NFT_CONTINUE:
5312 case NFT_BREAK:
5313 case NFT_RETURN:
5314 break;
5315 case NFT_JUMP:
5316 case NFT_GOTO:
5317 if (!tb[NFTA_VERDICT_CHAIN])
5318 return -EINVAL;
5319 chain = nf_tables_chain_lookup(ctx->table,
5320 tb[NFTA_VERDICT_CHAIN], genmask);
5321 if (IS_ERR(chain))
5322 return PTR_ERR(chain);
5323 if (chain->flags & NFT_BASE_CHAIN)
5324 return -EOPNOTSUPP;
5325
5326 chain->use++;
5327 data->verdict.chain = chain;
5328 break;
5329 }
5330
5331 desc->len = sizeof(data->verdict);
5332 desc->type = NFT_DATA_VERDICT;
5333 return 0;
5334 }
5335
5336 static void nft_verdict_uninit(const struct nft_data *data)
5337 {
5338 switch (data->verdict.code) {
5339 case NFT_JUMP:
5340 case NFT_GOTO:
5341 data->verdict.chain->use--;
5342 break;
5343 }
5344 }
5345
5346 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
5347 {
5348 struct nlattr *nest;
5349
5350 nest = nla_nest_start(skb, type);
5351 if (!nest)
5352 goto nla_put_failure;
5353
5354 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
5355 goto nla_put_failure;
5356
5357 switch (v->code) {
5358 case NFT_JUMP:
5359 case NFT_GOTO:
5360 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
5361 v->chain->name))
5362 goto nla_put_failure;
5363 }
5364 nla_nest_end(skb, nest);
5365 return 0;
5366
5367 nla_put_failure:
5368 return -1;
5369 }
5370
5371 static int nft_value_init(const struct nft_ctx *ctx,
5372 struct nft_data *data, unsigned int size,
5373 struct nft_data_desc *desc, const struct nlattr *nla)
5374 {
5375 unsigned int len;
5376
5377 len = nla_len(nla);
5378 if (len == 0)
5379 return -EINVAL;
5380 if (len > size)
5381 return -EOVERFLOW;
5382
5383 nla_memcpy(data->data, nla, len);
5384 desc->type = NFT_DATA_VALUE;
5385 desc->len = len;
5386 return 0;
5387 }
5388
5389 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
5390 unsigned int len)
5391 {
5392 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
5393 }
5394
5395 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
5396 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
5397 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
5398 };
5399
5400 /**
5401 * nft_data_init - parse nf_tables data netlink attributes
5402 *
5403 * @ctx: context of the expression using the data
5404 * @data: destination struct nft_data
5405 * @size: maximum data length
5406 * @desc: data description
5407 * @nla: netlink attribute containing data
5408 *
5409 * Parse the netlink data attributes and initialize a struct nft_data.
5410 * The type and length of data are returned in the data description.
5411 *
5412 * The caller can indicate that it only wants to accept data of type
5413 * NFT_DATA_VALUE by passing NULL for the ctx argument.
5414 */
5415 int nft_data_init(const struct nft_ctx *ctx,
5416 struct nft_data *data, unsigned int size,
5417 struct nft_data_desc *desc, const struct nlattr *nla)
5418 {
5419 struct nlattr *tb[NFTA_DATA_MAX + 1];
5420 int err;
5421
5422 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
5423 if (err < 0)
5424 return err;
5425
5426 if (tb[NFTA_DATA_VALUE])
5427 return nft_value_init(ctx, data, size, desc,
5428 tb[NFTA_DATA_VALUE]);
5429 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
5430 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
5431 return -EINVAL;
5432 }
5433 EXPORT_SYMBOL_GPL(nft_data_init);
5434
5435 /**
5436 * nft_data_uninit - release a nft_data item
5437 *
5438 * @data: struct nft_data to release
5439 * @type: type of data
5440 *
5441 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5442 * all others need to be released by calling this function.
5443 */
5444 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
5445 {
5446 if (type < NFT_DATA_VERDICT)
5447 return;
5448 switch (type) {
5449 case NFT_DATA_VERDICT:
5450 return nft_verdict_uninit(data);
5451 default:
5452 WARN_ON(1);
5453 }
5454 }
5455 EXPORT_SYMBOL_GPL(nft_data_uninit);
5456
5457 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
5458 enum nft_data_types type, unsigned int len)
5459 {
5460 struct nlattr *nest;
5461 int err;
5462
5463 nest = nla_nest_start(skb, attr);
5464 if (nest == NULL)
5465 return -1;
5466
5467 switch (type) {
5468 case NFT_DATA_VALUE:
5469 err = nft_value_dump(skb, data, len);
5470 break;
5471 case NFT_DATA_VERDICT:
5472 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
5473 break;
5474 default:
5475 err = -EINVAL;
5476 WARN_ON(1);
5477 }
5478
5479 nla_nest_end(skb, nest);
5480 return err;
5481 }
5482 EXPORT_SYMBOL_GPL(nft_data_dump);
5483
5484 static int __net_init nf_tables_init_net(struct net *net)
5485 {
5486 INIT_LIST_HEAD(&net->nft.af_info);
5487 INIT_LIST_HEAD(&net->nft.commit_list);
5488 net->nft.base_seq = 1;
5489 return 0;
5490 }
5491
5492 int __nft_release_basechain(struct nft_ctx *ctx)
5493 {
5494 struct nft_rule *rule, *nr;
5495
5496 BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
5497
5498 nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
5499 ctx->afi->nops);
5500 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
5501 list_del(&rule->list);
5502 ctx->chain->use--;
5503 nf_tables_rule_destroy(ctx, rule);
5504 }
5505 list_del(&ctx->chain->list);
5506 ctx->table->use--;
5507 nf_tables_chain_destroy(ctx->chain);
5508
5509 return 0;
5510 }
5511 EXPORT_SYMBOL_GPL(__nft_release_basechain);
5512
5513 /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
5514 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
5515 {
5516 struct nft_table *table, *nt;
5517 struct nft_chain *chain, *nc;
5518 struct nft_object *obj, *ne;
5519 struct nft_rule *rule, *nr;
5520 struct nft_set *set, *ns;
5521 struct nft_ctx ctx = {
5522 .net = net,
5523 .afi = afi,
5524 };
5525
5526 list_for_each_entry_safe(table, nt, &afi->tables, list) {
5527 list_for_each_entry(chain, &table->chains, list)
5528 nf_tables_unregister_hooks(net, table, chain,
5529 afi->nops);
5530 /* No packets are walking on these chains anymore. */
5531 ctx.table = table;
5532 list_for_each_entry(chain, &table->chains, list) {
5533 ctx.chain = chain;
5534 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
5535 list_del(&rule->list);
5536 chain->use--;
5537 nf_tables_rule_destroy(&ctx, rule);
5538 }
5539 }
5540 list_for_each_entry_safe(set, ns, &table->sets, list) {
5541 list_del(&set->list);
5542 table->use--;
5543 nft_set_destroy(set);
5544 }
5545 list_for_each_entry_safe(obj, ne, &table->objects, list) {
5546 list_del(&obj->list);
5547 table->use--;
5548 nft_obj_destroy(obj);
5549 }
5550 list_for_each_entry_safe(chain, nc, &table->chains, list) {
5551 list_del(&chain->list);
5552 table->use--;
5553 nf_tables_chain_destroy(chain);
5554 }
5555 list_del(&table->list);
5556 nf_tables_table_destroy(&ctx);
5557 }
5558 }
5559
5560 static struct pernet_operations nf_tables_net_ops = {
5561 .init = nf_tables_init_net,
5562 };
5563
5564 static int __init nf_tables_module_init(void)
5565 {
5566 int err;
5567
5568 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
5569 GFP_KERNEL);
5570 if (info == NULL) {
5571 err = -ENOMEM;
5572 goto err1;
5573 }
5574
5575 err = nf_tables_core_module_init();
5576 if (err < 0)
5577 goto err2;
5578
5579 err = nfnetlink_subsys_register(&nf_tables_subsys);
5580 if (err < 0)
5581 goto err3;
5582
5583 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
5584 return register_pernet_subsys(&nf_tables_net_ops);
5585 err3:
5586 nf_tables_core_module_exit();
5587 err2:
5588 kfree(info);
5589 err1:
5590 return err;
5591 }
5592
5593 static void __exit nf_tables_module_exit(void)
5594 {
5595 unregister_pernet_subsys(&nf_tables_net_ops);
5596 nfnetlink_subsys_unregister(&nf_tables_subsys);
5597 rcu_barrier();
5598 nf_tables_core_module_exit();
5599 kfree(info);
5600 }
5601
5602 module_init(nf_tables_module_init);
5603 module_exit(nf_tables_module_exit);
5604
5605 MODULE_LICENSE("GPL");
5606 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
5607 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
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