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netfilter: nf_tables: constify struct nft_ctx * parameter in nft_trans_alloc()
[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(const struct nft_ctx *ctx,
115 int msg_type, u32 size)
116 {
117 struct nft_trans *trans;
118
119 trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL);
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 void nft_trans_destroy(struct nft_trans *trans)
130 {
131 list_del(&trans->list);
132 kfree(trans);
133 }
134
135 static int nf_tables_register_hooks(struct net *net,
136 const struct nft_table *table,
137 struct nft_chain *chain,
138 unsigned int hook_nops)
139 {
140 if (table->flags & NFT_TABLE_F_DORMANT ||
141 !(chain->flags & NFT_BASE_CHAIN))
142 return 0;
143
144 return nf_register_net_hooks(net, nft_base_chain(chain)->ops,
145 hook_nops);
146 }
147
148 static void nf_tables_unregister_hooks(struct net *net,
149 const struct nft_table *table,
150 struct nft_chain *chain,
151 unsigned int hook_nops)
152 {
153 if (table->flags & NFT_TABLE_F_DORMANT ||
154 !(chain->flags & NFT_BASE_CHAIN))
155 return;
156
157 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops, hook_nops);
158 }
159
160 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
161 {
162 struct nft_trans *trans;
163
164 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
165 if (trans == NULL)
166 return -ENOMEM;
167
168 if (msg_type == NFT_MSG_NEWTABLE)
169 nft_activate_next(ctx->net, ctx->table);
170
171 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
172 return 0;
173 }
174
175 static int nft_deltable(struct nft_ctx *ctx)
176 {
177 int err;
178
179 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
180 if (err < 0)
181 return err;
182
183 nft_deactivate_next(ctx->net, ctx->table);
184 return err;
185 }
186
187 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
188 {
189 struct nft_trans *trans;
190
191 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
192 if (trans == NULL)
193 return -ENOMEM;
194
195 if (msg_type == NFT_MSG_NEWCHAIN)
196 nft_activate_next(ctx->net, ctx->chain);
197
198 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
199 return 0;
200 }
201
202 static int nft_delchain(struct nft_ctx *ctx)
203 {
204 int err;
205
206 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
207 if (err < 0)
208 return err;
209
210 ctx->table->use--;
211 nft_deactivate_next(ctx->net, ctx->chain);
212
213 return err;
214 }
215
216 static int
217 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
218 {
219 /* You cannot delete the same rule twice */
220 if (nft_is_active_next(ctx->net, rule)) {
221 nft_deactivate_next(ctx->net, rule);
222 ctx->chain->use--;
223 return 0;
224 }
225 return -ENOENT;
226 }
227
228 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
229 struct nft_rule *rule)
230 {
231 struct nft_trans *trans;
232
233 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
234 if (trans == NULL)
235 return NULL;
236
237 nft_trans_rule(trans) = rule;
238 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
239
240 return trans;
241 }
242
243 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
244 {
245 struct nft_trans *trans;
246 int err;
247
248 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
249 if (trans == NULL)
250 return -ENOMEM;
251
252 err = nf_tables_delrule_deactivate(ctx, rule);
253 if (err < 0) {
254 nft_trans_destroy(trans);
255 return err;
256 }
257
258 return 0;
259 }
260
261 static int nft_delrule_by_chain(struct nft_ctx *ctx)
262 {
263 struct nft_rule *rule;
264 int err;
265
266 list_for_each_entry(rule, &ctx->chain->rules, list) {
267 err = nft_delrule(ctx, rule);
268 if (err < 0)
269 return err;
270 }
271 return 0;
272 }
273
274 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
275 struct nft_set *set)
276 {
277 struct nft_trans *trans;
278
279 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
280 if (trans == NULL)
281 return -ENOMEM;
282
283 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
284 nft_trans_set_id(trans) =
285 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
286 nft_activate_next(ctx->net, set);
287 }
288 nft_trans_set(trans) = set;
289 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
290
291 return 0;
292 }
293
294 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
295 {
296 int err;
297
298 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
299 if (err < 0)
300 return err;
301
302 nft_deactivate_next(ctx->net, set);
303 ctx->table->use--;
304
305 return err;
306 }
307
308 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
309 struct nft_object *obj)
310 {
311 struct nft_trans *trans;
312
313 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
314 if (trans == NULL)
315 return -ENOMEM;
316
317 if (msg_type == NFT_MSG_NEWOBJ)
318 nft_activate_next(ctx->net, obj);
319
320 nft_trans_obj(trans) = obj;
321 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
322
323 return 0;
324 }
325
326 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
327 {
328 int err;
329
330 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
331 if (err < 0)
332 return err;
333
334 nft_deactivate_next(ctx->net, obj);
335 ctx->table->use--;
336
337 return err;
338 }
339
340 /*
341 * Tables
342 */
343
344 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
345 const struct nlattr *nla,
346 u8 genmask)
347 {
348 struct nft_table *table;
349
350 list_for_each_entry(table, &afi->tables, list) {
351 if (!nla_strcmp(nla, table->name) &&
352 nft_active_genmask(table, genmask))
353 return table;
354 }
355 return NULL;
356 }
357
358 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
359 const struct nlattr *nla,
360 u8 genmask)
361 {
362 struct nft_table *table;
363
364 if (nla == NULL)
365 return ERR_PTR(-EINVAL);
366
367 table = nft_table_lookup(afi, nla, genmask);
368 if (table != NULL)
369 return table;
370
371 return ERR_PTR(-ENOENT);
372 }
373
374 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
375 {
376 return ++table->hgenerator;
377 }
378
379 static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
380
381 static const struct nf_chain_type *
382 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
383 {
384 int i;
385
386 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
387 if (chain_type[family][i] != NULL &&
388 !nla_strcmp(nla, chain_type[family][i]->name))
389 return chain_type[family][i];
390 }
391 return NULL;
392 }
393
394 static const struct nf_chain_type *
395 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
396 const struct nlattr *nla,
397 bool autoload)
398 {
399 const struct nf_chain_type *type;
400
401 type = __nf_tables_chain_type_lookup(afi->family, nla);
402 if (type != NULL)
403 return type;
404 #ifdef CONFIG_MODULES
405 if (autoload) {
406 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
407 request_module("nft-chain-%u-%.*s", afi->family,
408 nla_len(nla), (const char *)nla_data(nla));
409 nfnl_lock(NFNL_SUBSYS_NFTABLES);
410 type = __nf_tables_chain_type_lookup(afi->family, nla);
411 if (type != NULL)
412 return ERR_PTR(-EAGAIN);
413 }
414 #endif
415 return ERR_PTR(-ENOENT);
416 }
417
418 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
419 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
420 .len = NFT_TABLE_MAXNAMELEN - 1 },
421 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
422 };
423
424 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
425 u32 portid, u32 seq, int event, u32 flags,
426 int family, const struct nft_table *table)
427 {
428 struct nlmsghdr *nlh;
429 struct nfgenmsg *nfmsg;
430
431 event |= NFNL_SUBSYS_NFTABLES << 8;
432 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
433 if (nlh == NULL)
434 goto nla_put_failure;
435
436 nfmsg = nlmsg_data(nlh);
437 nfmsg->nfgen_family = family;
438 nfmsg->version = NFNETLINK_V0;
439 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
440
441 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
442 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
443 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
444 goto nla_put_failure;
445
446 nlmsg_end(skb, nlh);
447 return 0;
448
449 nla_put_failure:
450 nlmsg_trim(skb, nlh);
451 return -1;
452 }
453
454 static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
455 {
456 struct sk_buff *skb;
457 int err;
458
459 if (!ctx->report &&
460 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
461 return 0;
462
463 err = -ENOBUFS;
464 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
465 if (skb == NULL)
466 goto err;
467
468 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
469 event, 0, ctx->afi->family, ctx->table);
470 if (err < 0) {
471 kfree_skb(skb);
472 goto err;
473 }
474
475 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
476 ctx->report, GFP_KERNEL);
477 err:
478 if (err < 0) {
479 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
480 err);
481 }
482 return err;
483 }
484
485 static int nf_tables_dump_tables(struct sk_buff *skb,
486 struct netlink_callback *cb)
487 {
488 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
489 const struct nft_af_info *afi;
490 const struct nft_table *table;
491 unsigned int idx = 0, s_idx = cb->args[0];
492 struct net *net = sock_net(skb->sk);
493 int family = nfmsg->nfgen_family;
494
495 rcu_read_lock();
496 cb->seq = net->nft.base_seq;
497
498 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
499 if (family != NFPROTO_UNSPEC && family != afi->family)
500 continue;
501
502 list_for_each_entry_rcu(table, &afi->tables, list) {
503 if (idx < s_idx)
504 goto cont;
505 if (idx > s_idx)
506 memset(&cb->args[1], 0,
507 sizeof(cb->args) - sizeof(cb->args[0]));
508 if (!nft_is_active(net, table))
509 continue;
510 if (nf_tables_fill_table_info(skb, net,
511 NETLINK_CB(cb->skb).portid,
512 cb->nlh->nlmsg_seq,
513 NFT_MSG_NEWTABLE,
514 NLM_F_MULTI,
515 afi->family, table) < 0)
516 goto done;
517
518 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
519 cont:
520 idx++;
521 }
522 }
523 done:
524 rcu_read_unlock();
525 cb->args[0] = idx;
526 return skb->len;
527 }
528
529 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
530 struct sk_buff *skb, const struct nlmsghdr *nlh,
531 const struct nlattr * const nla[])
532 {
533 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
534 u8 genmask = nft_genmask_cur(net);
535 const struct nft_af_info *afi;
536 const struct nft_table *table;
537 struct sk_buff *skb2;
538 int family = nfmsg->nfgen_family;
539 int err;
540
541 if (nlh->nlmsg_flags & NLM_F_DUMP) {
542 struct netlink_dump_control c = {
543 .dump = nf_tables_dump_tables,
544 };
545 return netlink_dump_start(nlsk, skb, nlh, &c);
546 }
547
548 afi = nf_tables_afinfo_lookup(net, family, false);
549 if (IS_ERR(afi))
550 return PTR_ERR(afi);
551
552 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
553 if (IS_ERR(table))
554 return PTR_ERR(table);
555
556 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
557 if (!skb2)
558 return -ENOMEM;
559
560 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
561 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
562 family, table);
563 if (err < 0)
564 goto err;
565
566 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
567
568 err:
569 kfree_skb(skb2);
570 return err;
571 }
572
573 static int nf_tables_table_enable(struct net *net,
574 const struct nft_af_info *afi,
575 struct nft_table *table)
576 {
577 struct nft_chain *chain;
578 int err, i = 0;
579
580 list_for_each_entry(chain, &table->chains, list) {
581 if (!nft_is_active_next(net, chain))
582 continue;
583 if (!(chain->flags & NFT_BASE_CHAIN))
584 continue;
585
586 err = nf_register_net_hooks(net, nft_base_chain(chain)->ops,
587 afi->nops);
588 if (err < 0)
589 goto err;
590
591 i++;
592 }
593 return 0;
594 err:
595 list_for_each_entry(chain, &table->chains, list) {
596 if (!nft_is_active_next(net, chain))
597 continue;
598 if (!(chain->flags & NFT_BASE_CHAIN))
599 continue;
600
601 if (i-- <= 0)
602 break;
603
604 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
605 afi->nops);
606 }
607 return err;
608 }
609
610 static void nf_tables_table_disable(struct net *net,
611 const struct nft_af_info *afi,
612 struct nft_table *table)
613 {
614 struct nft_chain *chain;
615
616 list_for_each_entry(chain, &table->chains, list) {
617 if (!nft_is_active_next(net, chain))
618 continue;
619 if (!(chain->flags & NFT_BASE_CHAIN))
620 continue;
621
622 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
623 afi->nops);
624 }
625 }
626
627 static int nf_tables_updtable(struct nft_ctx *ctx)
628 {
629 struct nft_trans *trans;
630 u32 flags;
631 int ret = 0;
632
633 if (!ctx->nla[NFTA_TABLE_FLAGS])
634 return 0;
635
636 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
637 if (flags & ~NFT_TABLE_F_DORMANT)
638 return -EINVAL;
639
640 if (flags == ctx->table->flags)
641 return 0;
642
643 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
644 sizeof(struct nft_trans_table));
645 if (trans == NULL)
646 return -ENOMEM;
647
648 if ((flags & NFT_TABLE_F_DORMANT) &&
649 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
650 nft_trans_table_enable(trans) = false;
651 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
652 ctx->table->flags & NFT_TABLE_F_DORMANT) {
653 ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table);
654 if (ret >= 0) {
655 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
656 nft_trans_table_enable(trans) = true;
657 }
658 }
659 if (ret < 0)
660 goto err;
661
662 nft_trans_table_update(trans) = true;
663 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
664 return 0;
665 err:
666 nft_trans_destroy(trans);
667 return ret;
668 }
669
670 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
671 struct sk_buff *skb, const struct nlmsghdr *nlh,
672 const struct nlattr * const nla[])
673 {
674 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
675 u8 genmask = nft_genmask_next(net);
676 const struct nlattr *name;
677 struct nft_af_info *afi;
678 struct nft_table *table;
679 int family = nfmsg->nfgen_family;
680 u32 flags = 0;
681 struct nft_ctx ctx;
682 int err;
683
684 afi = nf_tables_afinfo_lookup(net, family, true);
685 if (IS_ERR(afi))
686 return PTR_ERR(afi);
687
688 name = nla[NFTA_TABLE_NAME];
689 table = nf_tables_table_lookup(afi, name, genmask);
690 if (IS_ERR(table)) {
691 if (PTR_ERR(table) != -ENOENT)
692 return PTR_ERR(table);
693 table = NULL;
694 }
695
696 if (table != NULL) {
697 if (nlh->nlmsg_flags & NLM_F_EXCL)
698 return -EEXIST;
699 if (nlh->nlmsg_flags & NLM_F_REPLACE)
700 return -EOPNOTSUPP;
701
702 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
703 return nf_tables_updtable(&ctx);
704 }
705
706 if (nla[NFTA_TABLE_FLAGS]) {
707 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
708 if (flags & ~NFT_TABLE_F_DORMANT)
709 return -EINVAL;
710 }
711
712 err = -EAFNOSUPPORT;
713 if (!try_module_get(afi->owner))
714 goto err1;
715
716 err = -ENOMEM;
717 table = kzalloc(sizeof(*table), GFP_KERNEL);
718 if (table == NULL)
719 goto err2;
720
721 nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
722 INIT_LIST_HEAD(&table->chains);
723 INIT_LIST_HEAD(&table->sets);
724 INIT_LIST_HEAD(&table->objects);
725 table->flags = flags;
726
727 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
728 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
729 if (err < 0)
730 goto err3;
731
732 list_add_tail_rcu(&table->list, &afi->tables);
733 return 0;
734 err3:
735 kfree(table);
736 err2:
737 module_put(afi->owner);
738 err1:
739 return err;
740 }
741
742 static int nft_flush_table(struct nft_ctx *ctx)
743 {
744 int err;
745 struct nft_chain *chain, *nc;
746 struct nft_object *obj, *ne;
747 struct nft_set *set, *ns;
748
749 list_for_each_entry(chain, &ctx->table->chains, list) {
750 if (!nft_is_active_next(ctx->net, chain))
751 continue;
752
753 ctx->chain = chain;
754
755 err = nft_delrule_by_chain(ctx);
756 if (err < 0)
757 goto out;
758 }
759
760 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
761 if (!nft_is_active_next(ctx->net, set))
762 continue;
763
764 if (set->flags & NFT_SET_ANONYMOUS &&
765 !list_empty(&set->bindings))
766 continue;
767
768 err = nft_delset(ctx, set);
769 if (err < 0)
770 goto out;
771 }
772
773 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
774 err = nft_delobj(ctx, obj);
775 if (err < 0)
776 goto out;
777 }
778
779 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
780 if (!nft_is_active_next(ctx->net, chain))
781 continue;
782
783 ctx->chain = chain;
784
785 err = nft_delchain(ctx);
786 if (err < 0)
787 goto out;
788 }
789
790 err = nft_deltable(ctx);
791 out:
792 return err;
793 }
794
795 static int nft_flush(struct nft_ctx *ctx, int family)
796 {
797 struct nft_af_info *afi;
798 struct nft_table *table, *nt;
799 const struct nlattr * const *nla = ctx->nla;
800 int err = 0;
801
802 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
803 if (family != AF_UNSPEC && afi->family != family)
804 continue;
805
806 ctx->afi = afi;
807 list_for_each_entry_safe(table, nt, &afi->tables, list) {
808 if (!nft_is_active_next(ctx->net, table))
809 continue;
810
811 if (nla[NFTA_TABLE_NAME] &&
812 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
813 continue;
814
815 ctx->table = table;
816
817 err = nft_flush_table(ctx);
818 if (err < 0)
819 goto out;
820 }
821 }
822 out:
823 return err;
824 }
825
826 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
827 struct sk_buff *skb, const struct nlmsghdr *nlh,
828 const struct nlattr * const nla[])
829 {
830 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
831 u8 genmask = nft_genmask_next(net);
832 struct nft_af_info *afi;
833 struct nft_table *table;
834 int family = nfmsg->nfgen_family;
835 struct nft_ctx ctx;
836
837 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
838 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
839 return nft_flush(&ctx, family);
840
841 afi = nf_tables_afinfo_lookup(net, family, false);
842 if (IS_ERR(afi))
843 return PTR_ERR(afi);
844
845 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
846 if (IS_ERR(table))
847 return PTR_ERR(table);
848
849 ctx.afi = afi;
850 ctx.table = table;
851
852 return nft_flush_table(&ctx);
853 }
854
855 static void nf_tables_table_destroy(struct nft_ctx *ctx)
856 {
857 BUG_ON(ctx->table->use > 0);
858
859 kfree(ctx->table);
860 module_put(ctx->afi->owner);
861 }
862
863 int nft_register_chain_type(const struct nf_chain_type *ctype)
864 {
865 int err = 0;
866
867 nfnl_lock(NFNL_SUBSYS_NFTABLES);
868 if (chain_type[ctype->family][ctype->type] != NULL) {
869 err = -EBUSY;
870 goto out;
871 }
872 chain_type[ctype->family][ctype->type] = ctype;
873 out:
874 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
875 return err;
876 }
877 EXPORT_SYMBOL_GPL(nft_register_chain_type);
878
879 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
880 {
881 nfnl_lock(NFNL_SUBSYS_NFTABLES);
882 chain_type[ctype->family][ctype->type] = NULL;
883 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
884 }
885 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
886
887 /*
888 * Chains
889 */
890
891 static struct nft_chain *
892 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle,
893 u8 genmask)
894 {
895 struct nft_chain *chain;
896
897 list_for_each_entry(chain, &table->chains, list) {
898 if (chain->handle == handle &&
899 nft_active_genmask(chain, genmask))
900 return chain;
901 }
902
903 return ERR_PTR(-ENOENT);
904 }
905
906 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
907 const struct nlattr *nla,
908 u8 genmask)
909 {
910 struct nft_chain *chain;
911
912 if (nla == NULL)
913 return ERR_PTR(-EINVAL);
914
915 list_for_each_entry(chain, &table->chains, list) {
916 if (!nla_strcmp(nla, chain->name) &&
917 nft_active_genmask(chain, genmask))
918 return chain;
919 }
920
921 return ERR_PTR(-ENOENT);
922 }
923
924 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
925 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
926 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
927 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
928 .len = NFT_CHAIN_MAXNAMELEN - 1 },
929 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
930 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
931 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
932 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
933 };
934
935 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
936 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
937 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
938 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
939 .len = IFNAMSIZ - 1 },
940 };
941
942 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
943 {
944 struct nft_stats *cpu_stats, total;
945 struct nlattr *nest;
946 unsigned int seq;
947 u64 pkts, bytes;
948 int cpu;
949
950 memset(&total, 0, sizeof(total));
951 for_each_possible_cpu(cpu) {
952 cpu_stats = per_cpu_ptr(stats, cpu);
953 do {
954 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
955 pkts = cpu_stats->pkts;
956 bytes = cpu_stats->bytes;
957 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
958 total.pkts += pkts;
959 total.bytes += bytes;
960 }
961 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
962 if (nest == NULL)
963 goto nla_put_failure;
964
965 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
966 NFTA_COUNTER_PAD) ||
967 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
968 NFTA_COUNTER_PAD))
969 goto nla_put_failure;
970
971 nla_nest_end(skb, nest);
972 return 0;
973
974 nla_put_failure:
975 return -ENOSPC;
976 }
977
978 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
979 u32 portid, u32 seq, int event, u32 flags,
980 int family, const struct nft_table *table,
981 const struct nft_chain *chain)
982 {
983 struct nlmsghdr *nlh;
984 struct nfgenmsg *nfmsg;
985
986 event |= NFNL_SUBSYS_NFTABLES << 8;
987 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
988 if (nlh == NULL)
989 goto nla_put_failure;
990
991 nfmsg = nlmsg_data(nlh);
992 nfmsg->nfgen_family = family;
993 nfmsg->version = NFNETLINK_V0;
994 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
995
996 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
997 goto nla_put_failure;
998 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
999 NFTA_CHAIN_PAD))
1000 goto nla_put_failure;
1001 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1002 goto nla_put_failure;
1003
1004 if (chain->flags & NFT_BASE_CHAIN) {
1005 const struct nft_base_chain *basechain = nft_base_chain(chain);
1006 const struct nf_hook_ops *ops = &basechain->ops[0];
1007 struct nlattr *nest;
1008
1009 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
1010 if (nest == NULL)
1011 goto nla_put_failure;
1012 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1013 goto nla_put_failure;
1014 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1015 goto nla_put_failure;
1016 if (basechain->dev_name[0] &&
1017 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1018 goto nla_put_failure;
1019 nla_nest_end(skb, nest);
1020
1021 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1022 htonl(basechain->policy)))
1023 goto nla_put_failure;
1024
1025 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1026 goto nla_put_failure;
1027
1028 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
1029 goto nla_put_failure;
1030 }
1031
1032 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1033 goto nla_put_failure;
1034
1035 nlmsg_end(skb, nlh);
1036 return 0;
1037
1038 nla_put_failure:
1039 nlmsg_trim(skb, nlh);
1040 return -1;
1041 }
1042
1043 static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1044 {
1045 struct sk_buff *skb;
1046 int err;
1047
1048 if (!ctx->report &&
1049 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1050 return 0;
1051
1052 err = -ENOBUFS;
1053 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1054 if (skb == NULL)
1055 goto err;
1056
1057 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1058 event, 0, ctx->afi->family, ctx->table,
1059 ctx->chain);
1060 if (err < 0) {
1061 kfree_skb(skb);
1062 goto err;
1063 }
1064
1065 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1066 ctx->report, GFP_KERNEL);
1067 err:
1068 if (err < 0) {
1069 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1070 err);
1071 }
1072 return err;
1073 }
1074
1075 static int nf_tables_dump_chains(struct sk_buff *skb,
1076 struct netlink_callback *cb)
1077 {
1078 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1079 const struct nft_af_info *afi;
1080 const struct nft_table *table;
1081 const struct nft_chain *chain;
1082 unsigned int idx = 0, s_idx = cb->args[0];
1083 struct net *net = sock_net(skb->sk);
1084 int family = nfmsg->nfgen_family;
1085
1086 rcu_read_lock();
1087 cb->seq = net->nft.base_seq;
1088
1089 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1090 if (family != NFPROTO_UNSPEC && family != afi->family)
1091 continue;
1092
1093 list_for_each_entry_rcu(table, &afi->tables, list) {
1094 list_for_each_entry_rcu(chain, &table->chains, list) {
1095 if (idx < s_idx)
1096 goto cont;
1097 if (idx > s_idx)
1098 memset(&cb->args[1], 0,
1099 sizeof(cb->args) - sizeof(cb->args[0]));
1100 if (!nft_is_active(net, chain))
1101 continue;
1102 if (nf_tables_fill_chain_info(skb, net,
1103 NETLINK_CB(cb->skb).portid,
1104 cb->nlh->nlmsg_seq,
1105 NFT_MSG_NEWCHAIN,
1106 NLM_F_MULTI,
1107 afi->family, table, chain) < 0)
1108 goto done;
1109
1110 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1111 cont:
1112 idx++;
1113 }
1114 }
1115 }
1116 done:
1117 rcu_read_unlock();
1118 cb->args[0] = idx;
1119 return skb->len;
1120 }
1121
1122 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1123 struct sk_buff *skb, const struct nlmsghdr *nlh,
1124 const struct nlattr * const nla[])
1125 {
1126 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1127 u8 genmask = nft_genmask_cur(net);
1128 const struct nft_af_info *afi;
1129 const struct nft_table *table;
1130 const struct nft_chain *chain;
1131 struct sk_buff *skb2;
1132 int family = nfmsg->nfgen_family;
1133 int err;
1134
1135 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1136 struct netlink_dump_control c = {
1137 .dump = nf_tables_dump_chains,
1138 };
1139 return netlink_dump_start(nlsk, skb, nlh, &c);
1140 }
1141
1142 afi = nf_tables_afinfo_lookup(net, family, false);
1143 if (IS_ERR(afi))
1144 return PTR_ERR(afi);
1145
1146 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1147 if (IS_ERR(table))
1148 return PTR_ERR(table);
1149
1150 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1151 if (IS_ERR(chain))
1152 return PTR_ERR(chain);
1153
1154 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1155 if (!skb2)
1156 return -ENOMEM;
1157
1158 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1159 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1160 family, table, chain);
1161 if (err < 0)
1162 goto err;
1163
1164 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1165
1166 err:
1167 kfree_skb(skb2);
1168 return err;
1169 }
1170
1171 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1172 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1173 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1174 };
1175
1176 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1177 {
1178 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1179 struct nft_stats __percpu *newstats;
1180 struct nft_stats *stats;
1181 int err;
1182
1183 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1184 if (err < 0)
1185 return ERR_PTR(err);
1186
1187 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1188 return ERR_PTR(-EINVAL);
1189
1190 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1191 if (newstats == NULL)
1192 return ERR_PTR(-ENOMEM);
1193
1194 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1195 * are not exposed to userspace.
1196 */
1197 preempt_disable();
1198 stats = this_cpu_ptr(newstats);
1199 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1200 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1201 preempt_enable();
1202
1203 return newstats;
1204 }
1205
1206 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1207 struct nft_stats __percpu *newstats)
1208 {
1209 if (newstats == NULL)
1210 return;
1211
1212 if (chain->stats) {
1213 struct nft_stats __percpu *oldstats =
1214 nft_dereference(chain->stats);
1215
1216 rcu_assign_pointer(chain->stats, newstats);
1217 synchronize_rcu();
1218 free_percpu(oldstats);
1219 } else
1220 rcu_assign_pointer(chain->stats, newstats);
1221 }
1222
1223 static void nf_tables_chain_destroy(struct nft_chain *chain)
1224 {
1225 BUG_ON(chain->use > 0);
1226
1227 if (chain->flags & NFT_BASE_CHAIN) {
1228 struct nft_base_chain *basechain = nft_base_chain(chain);
1229
1230 module_put(basechain->type->owner);
1231 free_percpu(basechain->stats);
1232 if (basechain->ops[0].dev != NULL)
1233 dev_put(basechain->ops[0].dev);
1234 kfree(basechain);
1235 } else {
1236 kfree(chain);
1237 }
1238 }
1239
1240 struct nft_chain_hook {
1241 u32 num;
1242 u32 priority;
1243 const struct nf_chain_type *type;
1244 struct net_device *dev;
1245 };
1246
1247 static int nft_chain_parse_hook(struct net *net,
1248 const struct nlattr * const nla[],
1249 struct nft_af_info *afi,
1250 struct nft_chain_hook *hook, bool create)
1251 {
1252 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1253 const struct nf_chain_type *type;
1254 struct net_device *dev;
1255 int err;
1256
1257 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1258 nft_hook_policy);
1259 if (err < 0)
1260 return err;
1261
1262 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1263 ha[NFTA_HOOK_PRIORITY] == NULL)
1264 return -EINVAL;
1265
1266 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1267 if (hook->num >= afi->nhooks)
1268 return -EINVAL;
1269
1270 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1271
1272 type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT];
1273 if (nla[NFTA_CHAIN_TYPE]) {
1274 type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE],
1275 create);
1276 if (IS_ERR(type))
1277 return PTR_ERR(type);
1278 }
1279 if (!(type->hook_mask & (1 << hook->num)))
1280 return -EOPNOTSUPP;
1281 if (!try_module_get(type->owner))
1282 return -ENOENT;
1283
1284 hook->type = type;
1285
1286 hook->dev = NULL;
1287 if (afi->flags & NFT_AF_NEEDS_DEV) {
1288 char ifname[IFNAMSIZ];
1289
1290 if (!ha[NFTA_HOOK_DEV]) {
1291 module_put(type->owner);
1292 return -EOPNOTSUPP;
1293 }
1294
1295 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1296 dev = dev_get_by_name(net, ifname);
1297 if (!dev) {
1298 module_put(type->owner);
1299 return -ENOENT;
1300 }
1301 hook->dev = dev;
1302 } else if (ha[NFTA_HOOK_DEV]) {
1303 module_put(type->owner);
1304 return -EOPNOTSUPP;
1305 }
1306
1307 return 0;
1308 }
1309
1310 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1311 {
1312 module_put(hook->type->owner);
1313 if (hook->dev != NULL)
1314 dev_put(hook->dev);
1315 }
1316
1317 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1318 struct sk_buff *skb, const struct nlmsghdr *nlh,
1319 const struct nlattr * const nla[])
1320 {
1321 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1322 const struct nlattr * uninitialized_var(name);
1323 struct nft_af_info *afi;
1324 struct nft_table *table;
1325 struct nft_chain *chain;
1326 struct nft_base_chain *basechain = NULL;
1327 u8 genmask = nft_genmask_next(net);
1328 int family = nfmsg->nfgen_family;
1329 u8 policy = NF_ACCEPT;
1330 u64 handle = 0;
1331 unsigned int i;
1332 struct nft_stats __percpu *stats;
1333 int err;
1334 bool create;
1335 struct nft_ctx ctx;
1336
1337 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1338
1339 afi = nf_tables_afinfo_lookup(net, family, true);
1340 if (IS_ERR(afi))
1341 return PTR_ERR(afi);
1342
1343 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1344 if (IS_ERR(table))
1345 return PTR_ERR(table);
1346
1347 chain = NULL;
1348 name = nla[NFTA_CHAIN_NAME];
1349
1350 if (nla[NFTA_CHAIN_HANDLE]) {
1351 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1352 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
1353 if (IS_ERR(chain))
1354 return PTR_ERR(chain);
1355 } else {
1356 chain = nf_tables_chain_lookup(table, name, genmask);
1357 if (IS_ERR(chain)) {
1358 if (PTR_ERR(chain) != -ENOENT)
1359 return PTR_ERR(chain);
1360 chain = NULL;
1361 }
1362 }
1363
1364 if (nla[NFTA_CHAIN_POLICY]) {
1365 if ((chain != NULL &&
1366 !(chain->flags & NFT_BASE_CHAIN)))
1367 return -EOPNOTSUPP;
1368
1369 if (chain == NULL &&
1370 nla[NFTA_CHAIN_HOOK] == NULL)
1371 return -EOPNOTSUPP;
1372
1373 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1374 switch (policy) {
1375 case NF_DROP:
1376 case NF_ACCEPT:
1377 break;
1378 default:
1379 return -EINVAL;
1380 }
1381 }
1382
1383 if (chain != NULL) {
1384 struct nft_stats *stats = NULL;
1385 struct nft_trans *trans;
1386
1387 if (nlh->nlmsg_flags & NLM_F_EXCL)
1388 return -EEXIST;
1389 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1390 return -EOPNOTSUPP;
1391
1392 if (nla[NFTA_CHAIN_HOOK]) {
1393 struct nft_base_chain *basechain;
1394 struct nft_chain_hook hook;
1395 struct nf_hook_ops *ops;
1396
1397 if (!(chain->flags & NFT_BASE_CHAIN))
1398 return -EBUSY;
1399
1400 err = nft_chain_parse_hook(net, nla, afi, &hook,
1401 create);
1402 if (err < 0)
1403 return err;
1404
1405 basechain = nft_base_chain(chain);
1406 if (basechain->type != hook.type) {
1407 nft_chain_release_hook(&hook);
1408 return -EBUSY;
1409 }
1410
1411 for (i = 0; i < afi->nops; i++) {
1412 ops = &basechain->ops[i];
1413 if (ops->hooknum != hook.num ||
1414 ops->priority != hook.priority ||
1415 ops->dev != hook.dev) {
1416 nft_chain_release_hook(&hook);
1417 return -EBUSY;
1418 }
1419 }
1420 nft_chain_release_hook(&hook);
1421 }
1422
1423 if (nla[NFTA_CHAIN_HANDLE] && name) {
1424 struct nft_chain *chain2;
1425
1426 chain2 = nf_tables_chain_lookup(table,
1427 nla[NFTA_CHAIN_NAME],
1428 genmask);
1429 if (IS_ERR(chain2))
1430 return PTR_ERR(chain2);
1431 }
1432
1433 if (nla[NFTA_CHAIN_COUNTERS]) {
1434 if (!(chain->flags & NFT_BASE_CHAIN))
1435 return -EOPNOTSUPP;
1436
1437 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1438 if (IS_ERR(stats))
1439 return PTR_ERR(stats);
1440 }
1441
1442 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1443 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1444 sizeof(struct nft_trans_chain));
1445 if (trans == NULL) {
1446 free_percpu(stats);
1447 return -ENOMEM;
1448 }
1449
1450 nft_trans_chain_stats(trans) = stats;
1451 nft_trans_chain_update(trans) = true;
1452
1453 if (nla[NFTA_CHAIN_POLICY])
1454 nft_trans_chain_policy(trans) = policy;
1455 else
1456 nft_trans_chain_policy(trans) = -1;
1457
1458 if (nla[NFTA_CHAIN_HANDLE] && name) {
1459 nla_strlcpy(nft_trans_chain_name(trans), name,
1460 NFT_CHAIN_MAXNAMELEN);
1461 }
1462 list_add_tail(&trans->list, &net->nft.commit_list);
1463 return 0;
1464 }
1465
1466 if (table->use == UINT_MAX)
1467 return -EOVERFLOW;
1468
1469 if (nla[NFTA_CHAIN_HOOK]) {
1470 struct nft_chain_hook hook;
1471 struct nf_hook_ops *ops;
1472 nf_hookfn *hookfn;
1473
1474 err = nft_chain_parse_hook(net, nla, afi, &hook, create);
1475 if (err < 0)
1476 return err;
1477
1478 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1479 if (basechain == NULL) {
1480 nft_chain_release_hook(&hook);
1481 return -ENOMEM;
1482 }
1483
1484 if (hook.dev != NULL)
1485 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1486
1487 if (nla[NFTA_CHAIN_COUNTERS]) {
1488 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1489 if (IS_ERR(stats)) {
1490 nft_chain_release_hook(&hook);
1491 kfree(basechain);
1492 return PTR_ERR(stats);
1493 }
1494 basechain->stats = stats;
1495 } else {
1496 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1497 if (stats == NULL) {
1498 nft_chain_release_hook(&hook);
1499 kfree(basechain);
1500 return -ENOMEM;
1501 }
1502 rcu_assign_pointer(basechain->stats, stats);
1503 }
1504
1505 hookfn = hook.type->hooks[hook.num];
1506 basechain->type = hook.type;
1507 chain = &basechain->chain;
1508
1509 for (i = 0; i < afi->nops; i++) {
1510 ops = &basechain->ops[i];
1511 ops->pf = family;
1512 ops->hooknum = hook.num;
1513 ops->priority = hook.priority;
1514 ops->priv = chain;
1515 ops->hook = afi->hooks[ops->hooknum];
1516 ops->dev = hook.dev;
1517 if (hookfn)
1518 ops->hook = hookfn;
1519 if (afi->hook_ops_init)
1520 afi->hook_ops_init(ops, i);
1521 }
1522
1523 chain->flags |= NFT_BASE_CHAIN;
1524 basechain->policy = policy;
1525 } else {
1526 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1527 if (chain == NULL)
1528 return -ENOMEM;
1529 }
1530
1531 INIT_LIST_HEAD(&chain->rules);
1532 chain->handle = nf_tables_alloc_handle(table);
1533 chain->table = table;
1534 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1535
1536 err = nf_tables_register_hooks(net, table, chain, afi->nops);
1537 if (err < 0)
1538 goto err1;
1539
1540 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1541 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1542 if (err < 0)
1543 goto err2;
1544
1545 table->use++;
1546 list_add_tail_rcu(&chain->list, &table->chains);
1547 return 0;
1548 err2:
1549 nf_tables_unregister_hooks(net, table, chain, afi->nops);
1550 err1:
1551 nf_tables_chain_destroy(chain);
1552 return err;
1553 }
1554
1555 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1556 struct sk_buff *skb, const struct nlmsghdr *nlh,
1557 const struct nlattr * const nla[])
1558 {
1559 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1560 u8 genmask = nft_genmask_next(net);
1561 struct nft_af_info *afi;
1562 struct nft_table *table;
1563 struct nft_chain *chain;
1564 int family = nfmsg->nfgen_family;
1565 struct nft_ctx ctx;
1566
1567 afi = nf_tables_afinfo_lookup(net, family, false);
1568 if (IS_ERR(afi))
1569 return PTR_ERR(afi);
1570
1571 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1572 if (IS_ERR(table))
1573 return PTR_ERR(table);
1574
1575 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1576 if (IS_ERR(chain))
1577 return PTR_ERR(chain);
1578 if (chain->use > 0)
1579 return -EBUSY;
1580
1581 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1582
1583 return nft_delchain(&ctx);
1584 }
1585
1586 /*
1587 * Expressions
1588 */
1589
1590 /**
1591 * nft_register_expr - register nf_tables expr type
1592 * @ops: expr type
1593 *
1594 * Registers the expr type for use with nf_tables. Returns zero on
1595 * success or a negative errno code otherwise.
1596 */
1597 int nft_register_expr(struct nft_expr_type *type)
1598 {
1599 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1600 if (type->family == NFPROTO_UNSPEC)
1601 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1602 else
1603 list_add_rcu(&type->list, &nf_tables_expressions);
1604 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1605 return 0;
1606 }
1607 EXPORT_SYMBOL_GPL(nft_register_expr);
1608
1609 /**
1610 * nft_unregister_expr - unregister nf_tables expr type
1611 * @ops: expr type
1612 *
1613 * Unregisters the expr typefor use with nf_tables.
1614 */
1615 void nft_unregister_expr(struct nft_expr_type *type)
1616 {
1617 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1618 list_del_rcu(&type->list);
1619 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1620 }
1621 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1622
1623 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1624 struct nlattr *nla)
1625 {
1626 const struct nft_expr_type *type;
1627
1628 list_for_each_entry(type, &nf_tables_expressions, list) {
1629 if (!nla_strcmp(nla, type->name) &&
1630 (!type->family || type->family == family))
1631 return type;
1632 }
1633 return NULL;
1634 }
1635
1636 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1637 struct nlattr *nla)
1638 {
1639 const struct nft_expr_type *type;
1640
1641 if (nla == NULL)
1642 return ERR_PTR(-EINVAL);
1643
1644 type = __nft_expr_type_get(family, nla);
1645 if (type != NULL && try_module_get(type->owner))
1646 return type;
1647
1648 #ifdef CONFIG_MODULES
1649 if (type == NULL) {
1650 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1651 request_module("nft-expr-%u-%.*s", family,
1652 nla_len(nla), (char *)nla_data(nla));
1653 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1654 if (__nft_expr_type_get(family, nla))
1655 return ERR_PTR(-EAGAIN);
1656
1657 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1658 request_module("nft-expr-%.*s",
1659 nla_len(nla), (char *)nla_data(nla));
1660 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1661 if (__nft_expr_type_get(family, nla))
1662 return ERR_PTR(-EAGAIN);
1663 }
1664 #endif
1665 return ERR_PTR(-ENOENT);
1666 }
1667
1668 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1669 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1670 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1671 };
1672
1673 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1674 const struct nft_expr *expr)
1675 {
1676 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1677 goto nla_put_failure;
1678
1679 if (expr->ops->dump) {
1680 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1681 if (data == NULL)
1682 goto nla_put_failure;
1683 if (expr->ops->dump(skb, expr) < 0)
1684 goto nla_put_failure;
1685 nla_nest_end(skb, data);
1686 }
1687
1688 return skb->len;
1689
1690 nla_put_failure:
1691 return -1;
1692 };
1693
1694 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1695 const struct nft_expr *expr)
1696 {
1697 struct nlattr *nest;
1698
1699 nest = nla_nest_start(skb, attr);
1700 if (!nest)
1701 goto nla_put_failure;
1702 if (nf_tables_fill_expr_info(skb, expr) < 0)
1703 goto nla_put_failure;
1704 nla_nest_end(skb, nest);
1705 return 0;
1706
1707 nla_put_failure:
1708 return -1;
1709 }
1710
1711 struct nft_expr_info {
1712 const struct nft_expr_ops *ops;
1713 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1714 };
1715
1716 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1717 const struct nlattr *nla,
1718 struct nft_expr_info *info)
1719 {
1720 const struct nft_expr_type *type;
1721 const struct nft_expr_ops *ops;
1722 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1723 int err;
1724
1725 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1726 if (err < 0)
1727 return err;
1728
1729 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1730 if (IS_ERR(type))
1731 return PTR_ERR(type);
1732
1733 if (tb[NFTA_EXPR_DATA]) {
1734 err = nla_parse_nested(info->tb, type->maxattr,
1735 tb[NFTA_EXPR_DATA], type->policy);
1736 if (err < 0)
1737 goto err1;
1738 } else
1739 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1740
1741 if (type->select_ops != NULL) {
1742 ops = type->select_ops(ctx,
1743 (const struct nlattr * const *)info->tb);
1744 if (IS_ERR(ops)) {
1745 err = PTR_ERR(ops);
1746 goto err1;
1747 }
1748 } else
1749 ops = type->ops;
1750
1751 info->ops = ops;
1752 return 0;
1753
1754 err1:
1755 module_put(type->owner);
1756 return err;
1757 }
1758
1759 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1760 const struct nft_expr_info *info,
1761 struct nft_expr *expr)
1762 {
1763 const struct nft_expr_ops *ops = info->ops;
1764 int err;
1765
1766 expr->ops = ops;
1767 if (ops->init) {
1768 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1769 if (err < 0)
1770 goto err1;
1771 }
1772
1773 return 0;
1774
1775 err1:
1776 expr->ops = NULL;
1777 return err;
1778 }
1779
1780 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1781 struct nft_expr *expr)
1782 {
1783 if (expr->ops->destroy)
1784 expr->ops->destroy(ctx, expr);
1785 module_put(expr->ops->type->owner);
1786 }
1787
1788 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1789 const struct nlattr *nla)
1790 {
1791 struct nft_expr_info info;
1792 struct nft_expr *expr;
1793 int err;
1794
1795 err = nf_tables_expr_parse(ctx, nla, &info);
1796 if (err < 0)
1797 goto err1;
1798
1799 err = -ENOMEM;
1800 expr = kzalloc(info.ops->size, GFP_KERNEL);
1801 if (expr == NULL)
1802 goto err2;
1803
1804 err = nf_tables_newexpr(ctx, &info, expr);
1805 if (err < 0)
1806 goto err3;
1807
1808 return expr;
1809 err3:
1810 kfree(expr);
1811 err2:
1812 module_put(info.ops->type->owner);
1813 err1:
1814 return ERR_PTR(err);
1815 }
1816
1817 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1818 {
1819 nf_tables_expr_destroy(ctx, expr);
1820 kfree(expr);
1821 }
1822
1823 /*
1824 * Rules
1825 */
1826
1827 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1828 u64 handle)
1829 {
1830 struct nft_rule *rule;
1831
1832 // FIXME: this sucks
1833 list_for_each_entry(rule, &chain->rules, list) {
1834 if (handle == rule->handle)
1835 return rule;
1836 }
1837
1838 return ERR_PTR(-ENOENT);
1839 }
1840
1841 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1842 const struct nlattr *nla)
1843 {
1844 if (nla == NULL)
1845 return ERR_PTR(-EINVAL);
1846
1847 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1848 }
1849
1850 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1851 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1852 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1853 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1854 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1855 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1856 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1857 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1858 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1859 .len = NFT_USERDATA_MAXLEN },
1860 };
1861
1862 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1863 u32 portid, u32 seq, int event,
1864 u32 flags, int family,
1865 const struct nft_table *table,
1866 const struct nft_chain *chain,
1867 const struct nft_rule *rule)
1868 {
1869 struct nlmsghdr *nlh;
1870 struct nfgenmsg *nfmsg;
1871 const struct nft_expr *expr, *next;
1872 struct nlattr *list;
1873 const struct nft_rule *prule;
1874 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1875
1876 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1877 flags);
1878 if (nlh == NULL)
1879 goto nla_put_failure;
1880
1881 nfmsg = nlmsg_data(nlh);
1882 nfmsg->nfgen_family = family;
1883 nfmsg->version = NFNETLINK_V0;
1884 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1885
1886 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1887 goto nla_put_failure;
1888 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1889 goto nla_put_failure;
1890 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1891 NFTA_RULE_PAD))
1892 goto nla_put_failure;
1893
1894 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1895 prule = list_entry(rule->list.prev, struct nft_rule, list);
1896 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1897 cpu_to_be64(prule->handle),
1898 NFTA_RULE_PAD))
1899 goto nla_put_failure;
1900 }
1901
1902 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1903 if (list == NULL)
1904 goto nla_put_failure;
1905 nft_rule_for_each_expr(expr, next, rule) {
1906 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
1907 goto nla_put_failure;
1908 }
1909 nla_nest_end(skb, list);
1910
1911 if (rule->udata) {
1912 struct nft_userdata *udata = nft_userdata(rule);
1913 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1914 udata->data) < 0)
1915 goto nla_put_failure;
1916 }
1917
1918 nlmsg_end(skb, nlh);
1919 return 0;
1920
1921 nla_put_failure:
1922 nlmsg_trim(skb, nlh);
1923 return -1;
1924 }
1925
1926 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1927 const struct nft_rule *rule,
1928 int event)
1929 {
1930 struct sk_buff *skb;
1931 int err;
1932
1933 if (!ctx->report &&
1934 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1935 return 0;
1936
1937 err = -ENOBUFS;
1938 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1939 if (skb == NULL)
1940 goto err;
1941
1942 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1943 event, 0, ctx->afi->family, ctx->table,
1944 ctx->chain, rule);
1945 if (err < 0) {
1946 kfree_skb(skb);
1947 goto err;
1948 }
1949
1950 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1951 ctx->report, GFP_KERNEL);
1952 err:
1953 if (err < 0) {
1954 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1955 err);
1956 }
1957 return err;
1958 }
1959
1960 struct nft_rule_dump_ctx {
1961 char table[NFT_TABLE_MAXNAMELEN];
1962 char chain[NFT_CHAIN_MAXNAMELEN];
1963 };
1964
1965 static int nf_tables_dump_rules(struct sk_buff *skb,
1966 struct netlink_callback *cb)
1967 {
1968 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1969 const struct nft_rule_dump_ctx *ctx = cb->data;
1970 const struct nft_af_info *afi;
1971 const struct nft_table *table;
1972 const struct nft_chain *chain;
1973 const struct nft_rule *rule;
1974 unsigned int idx = 0, s_idx = cb->args[0];
1975 struct net *net = sock_net(skb->sk);
1976 int family = nfmsg->nfgen_family;
1977
1978 rcu_read_lock();
1979 cb->seq = net->nft.base_seq;
1980
1981 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1982 if (family != NFPROTO_UNSPEC && family != afi->family)
1983 continue;
1984
1985 list_for_each_entry_rcu(table, &afi->tables, list) {
1986 if (ctx && ctx->table[0] &&
1987 strcmp(ctx->table, table->name) != 0)
1988 continue;
1989
1990 list_for_each_entry_rcu(chain, &table->chains, list) {
1991 if (ctx && ctx->chain[0] &&
1992 strcmp(ctx->chain, chain->name) != 0)
1993 continue;
1994
1995 list_for_each_entry_rcu(rule, &chain->rules, list) {
1996 if (!nft_is_active(net, rule))
1997 goto cont;
1998 if (idx < s_idx)
1999 goto cont;
2000 if (idx > s_idx)
2001 memset(&cb->args[1], 0,
2002 sizeof(cb->args) - sizeof(cb->args[0]));
2003 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2004 cb->nlh->nlmsg_seq,
2005 NFT_MSG_NEWRULE,
2006 NLM_F_MULTI | NLM_F_APPEND,
2007 afi->family, table, chain, rule) < 0)
2008 goto done;
2009
2010 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2011 cont:
2012 idx++;
2013 }
2014 }
2015 }
2016 }
2017 done:
2018 rcu_read_unlock();
2019
2020 cb->args[0] = idx;
2021 return skb->len;
2022 }
2023
2024 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2025 {
2026 kfree(cb->data);
2027 return 0;
2028 }
2029
2030 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2031 struct sk_buff *skb, const struct nlmsghdr *nlh,
2032 const struct nlattr * const nla[])
2033 {
2034 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2035 u8 genmask = nft_genmask_cur(net);
2036 const struct nft_af_info *afi;
2037 const struct nft_table *table;
2038 const struct nft_chain *chain;
2039 const struct nft_rule *rule;
2040 struct sk_buff *skb2;
2041 int family = nfmsg->nfgen_family;
2042 int err;
2043
2044 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2045 struct netlink_dump_control c = {
2046 .dump = nf_tables_dump_rules,
2047 .done = nf_tables_dump_rules_done,
2048 };
2049
2050 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2051 struct nft_rule_dump_ctx *ctx;
2052
2053 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
2054 if (!ctx)
2055 return -ENOMEM;
2056
2057 if (nla[NFTA_RULE_TABLE])
2058 nla_strlcpy(ctx->table, nla[NFTA_RULE_TABLE],
2059 sizeof(ctx->table));
2060 if (nla[NFTA_RULE_CHAIN])
2061 nla_strlcpy(ctx->chain, nla[NFTA_RULE_CHAIN],
2062 sizeof(ctx->chain));
2063 c.data = ctx;
2064 }
2065
2066 return netlink_dump_start(nlsk, skb, nlh, &c);
2067 }
2068
2069 afi = nf_tables_afinfo_lookup(net, family, false);
2070 if (IS_ERR(afi))
2071 return PTR_ERR(afi);
2072
2073 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2074 if (IS_ERR(table))
2075 return PTR_ERR(table);
2076
2077 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2078 if (IS_ERR(chain))
2079 return PTR_ERR(chain);
2080
2081 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2082 if (IS_ERR(rule))
2083 return PTR_ERR(rule);
2084
2085 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2086 if (!skb2)
2087 return -ENOMEM;
2088
2089 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2090 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2091 family, table, chain, rule);
2092 if (err < 0)
2093 goto err;
2094
2095 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2096
2097 err:
2098 kfree_skb(skb2);
2099 return err;
2100 }
2101
2102 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2103 struct nft_rule *rule)
2104 {
2105 struct nft_expr *expr;
2106
2107 /*
2108 * Careful: some expressions might not be initialized in case this
2109 * is called on error from nf_tables_newrule().
2110 */
2111 expr = nft_expr_first(rule);
2112 while (expr->ops && expr != nft_expr_last(rule)) {
2113 nf_tables_expr_destroy(ctx, expr);
2114 expr = nft_expr_next(expr);
2115 }
2116 kfree(rule);
2117 }
2118
2119 #define NFT_RULE_MAXEXPRS 128
2120
2121 static struct nft_expr_info *info;
2122
2123 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2124 struct sk_buff *skb, const struct nlmsghdr *nlh,
2125 const struct nlattr * const nla[])
2126 {
2127 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2128 u8 genmask = nft_genmask_next(net);
2129 struct nft_af_info *afi;
2130 struct nft_table *table;
2131 struct nft_chain *chain;
2132 struct nft_rule *rule, *old_rule = NULL;
2133 struct nft_userdata *udata;
2134 struct nft_trans *trans = NULL;
2135 struct nft_expr *expr;
2136 struct nft_ctx ctx;
2137 struct nlattr *tmp;
2138 unsigned int size, i, n, ulen = 0, usize = 0;
2139 int err, rem;
2140 bool create;
2141 u64 handle, pos_handle;
2142
2143 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2144
2145 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2146 if (IS_ERR(afi))
2147 return PTR_ERR(afi);
2148
2149 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2150 if (IS_ERR(table))
2151 return PTR_ERR(table);
2152
2153 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2154 if (IS_ERR(chain))
2155 return PTR_ERR(chain);
2156
2157 if (nla[NFTA_RULE_HANDLE]) {
2158 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2159 rule = __nf_tables_rule_lookup(chain, handle);
2160 if (IS_ERR(rule))
2161 return PTR_ERR(rule);
2162
2163 if (nlh->nlmsg_flags & NLM_F_EXCL)
2164 return -EEXIST;
2165 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2166 old_rule = rule;
2167 else
2168 return -EOPNOTSUPP;
2169 } else {
2170 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2171 return -EINVAL;
2172 handle = nf_tables_alloc_handle(table);
2173
2174 if (chain->use == UINT_MAX)
2175 return -EOVERFLOW;
2176 }
2177
2178 if (nla[NFTA_RULE_POSITION]) {
2179 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2180 return -EOPNOTSUPP;
2181
2182 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2183 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2184 if (IS_ERR(old_rule))
2185 return PTR_ERR(old_rule);
2186 }
2187
2188 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2189
2190 n = 0;
2191 size = 0;
2192 if (nla[NFTA_RULE_EXPRESSIONS]) {
2193 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2194 err = -EINVAL;
2195 if (nla_type(tmp) != NFTA_LIST_ELEM)
2196 goto err1;
2197 if (n == NFT_RULE_MAXEXPRS)
2198 goto err1;
2199 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2200 if (err < 0)
2201 goto err1;
2202 size += info[n].ops->size;
2203 n++;
2204 }
2205 }
2206 /* Check for overflow of dlen field */
2207 err = -EFBIG;
2208 if (size >= 1 << 12)
2209 goto err1;
2210
2211 if (nla[NFTA_RULE_USERDATA]) {
2212 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2213 if (ulen > 0)
2214 usize = sizeof(struct nft_userdata) + ulen;
2215 }
2216
2217 err = -ENOMEM;
2218 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2219 if (rule == NULL)
2220 goto err1;
2221
2222 nft_activate_next(net, rule);
2223
2224 rule->handle = handle;
2225 rule->dlen = size;
2226 rule->udata = ulen ? 1 : 0;
2227
2228 if (ulen) {
2229 udata = nft_userdata(rule);
2230 udata->len = ulen - 1;
2231 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2232 }
2233
2234 expr = nft_expr_first(rule);
2235 for (i = 0; i < n; i++) {
2236 err = nf_tables_newexpr(&ctx, &info[i], expr);
2237 if (err < 0)
2238 goto err2;
2239 info[i].ops = NULL;
2240 expr = nft_expr_next(expr);
2241 }
2242
2243 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2244 if (nft_is_active_next(net, old_rule)) {
2245 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2246 old_rule);
2247 if (trans == NULL) {
2248 err = -ENOMEM;
2249 goto err2;
2250 }
2251 nft_deactivate_next(net, old_rule);
2252 chain->use--;
2253 list_add_tail_rcu(&rule->list, &old_rule->list);
2254 } else {
2255 err = -ENOENT;
2256 goto err2;
2257 }
2258 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2259 if (old_rule)
2260 list_add_rcu(&rule->list, &old_rule->list);
2261 else
2262 list_add_tail_rcu(&rule->list, &chain->rules);
2263 else {
2264 if (old_rule)
2265 list_add_tail_rcu(&rule->list, &old_rule->list);
2266 else
2267 list_add_rcu(&rule->list, &chain->rules);
2268 }
2269
2270 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2271 err = -ENOMEM;
2272 goto err3;
2273 }
2274 chain->use++;
2275 return 0;
2276
2277 err3:
2278 list_del_rcu(&rule->list);
2279 err2:
2280 nf_tables_rule_destroy(&ctx, rule);
2281 err1:
2282 for (i = 0; i < n; i++) {
2283 if (info[i].ops != NULL)
2284 module_put(info[i].ops->type->owner);
2285 }
2286 return err;
2287 }
2288
2289 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2290 struct sk_buff *skb, const struct nlmsghdr *nlh,
2291 const struct nlattr * const nla[])
2292 {
2293 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2294 u8 genmask = nft_genmask_next(net);
2295 struct nft_af_info *afi;
2296 struct nft_table *table;
2297 struct nft_chain *chain = NULL;
2298 struct nft_rule *rule;
2299 int family = nfmsg->nfgen_family, err = 0;
2300 struct nft_ctx ctx;
2301
2302 afi = nf_tables_afinfo_lookup(net, family, false);
2303 if (IS_ERR(afi))
2304 return PTR_ERR(afi);
2305
2306 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2307 if (IS_ERR(table))
2308 return PTR_ERR(table);
2309
2310 if (nla[NFTA_RULE_CHAIN]) {
2311 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2312 genmask);
2313 if (IS_ERR(chain))
2314 return PTR_ERR(chain);
2315 }
2316
2317 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2318
2319 if (chain) {
2320 if (nla[NFTA_RULE_HANDLE]) {
2321 rule = nf_tables_rule_lookup(chain,
2322 nla[NFTA_RULE_HANDLE]);
2323 if (IS_ERR(rule))
2324 return PTR_ERR(rule);
2325
2326 err = nft_delrule(&ctx, rule);
2327 } else {
2328 err = nft_delrule_by_chain(&ctx);
2329 }
2330 } else {
2331 list_for_each_entry(chain, &table->chains, list) {
2332 if (!nft_is_active_next(net, chain))
2333 continue;
2334
2335 ctx.chain = chain;
2336 err = nft_delrule_by_chain(&ctx);
2337 if (err < 0)
2338 break;
2339 }
2340 }
2341
2342 return err;
2343 }
2344
2345 /*
2346 * Sets
2347 */
2348
2349 static LIST_HEAD(nf_tables_set_ops);
2350
2351 int nft_register_set(struct nft_set_ops *ops)
2352 {
2353 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2354 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2355 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2356 return 0;
2357 }
2358 EXPORT_SYMBOL_GPL(nft_register_set);
2359
2360 void nft_unregister_set(struct nft_set_ops *ops)
2361 {
2362 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2363 list_del_rcu(&ops->list);
2364 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2365 }
2366 EXPORT_SYMBOL_GPL(nft_unregister_set);
2367
2368 /*
2369 * Select a set implementation based on the data characteristics and the
2370 * given policy. The total memory use might not be known if no size is
2371 * given, in that case the amount of memory per element is used.
2372 */
2373 static const struct nft_set_ops *
2374 nft_select_set_ops(const struct nlattr * const nla[],
2375 const struct nft_set_desc *desc,
2376 enum nft_set_policies policy)
2377 {
2378 const struct nft_set_ops *ops, *bops;
2379 struct nft_set_estimate est, best;
2380 u32 features;
2381
2382 #ifdef CONFIG_MODULES
2383 if (list_empty(&nf_tables_set_ops)) {
2384 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2385 request_module("nft-set");
2386 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2387 if (!list_empty(&nf_tables_set_ops))
2388 return ERR_PTR(-EAGAIN);
2389 }
2390 #endif
2391 features = 0;
2392 if (nla[NFTA_SET_FLAGS] != NULL) {
2393 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2394 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT;
2395 }
2396
2397 bops = NULL;
2398 best.size = ~0;
2399 best.class = ~0;
2400
2401 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2402 if ((ops->features & features) != features)
2403 continue;
2404 if (!ops->estimate(desc, features, &est))
2405 continue;
2406
2407 switch (policy) {
2408 case NFT_SET_POL_PERFORMANCE:
2409 if (est.class < best.class)
2410 break;
2411 if (est.class == best.class && est.size < best.size)
2412 break;
2413 continue;
2414 case NFT_SET_POL_MEMORY:
2415 if (est.size < best.size)
2416 break;
2417 if (est.size == best.size && est.class < best.class)
2418 break;
2419 continue;
2420 default:
2421 break;
2422 }
2423
2424 if (!try_module_get(ops->owner))
2425 continue;
2426 if (bops != NULL)
2427 module_put(bops->owner);
2428
2429 bops = ops;
2430 best = est;
2431 }
2432
2433 if (bops != NULL)
2434 return bops;
2435
2436 return ERR_PTR(-EOPNOTSUPP);
2437 }
2438
2439 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2440 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2441 [NFTA_SET_NAME] = { .type = NLA_STRING,
2442 .len = NFT_SET_MAXNAMELEN - 1 },
2443 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2444 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2445 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2446 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2447 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2448 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2449 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2450 [NFTA_SET_ID] = { .type = NLA_U32 },
2451 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2452 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2453 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2454 .len = NFT_USERDATA_MAXLEN },
2455 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
2456 };
2457
2458 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2459 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2460 };
2461
2462 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2463 const struct sk_buff *skb,
2464 const struct nlmsghdr *nlh,
2465 const struct nlattr * const nla[],
2466 u8 genmask)
2467 {
2468 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2469 struct nft_af_info *afi = NULL;
2470 struct nft_table *table = NULL;
2471
2472 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2473 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2474 if (IS_ERR(afi))
2475 return PTR_ERR(afi);
2476 }
2477
2478 if (nla[NFTA_SET_TABLE] != NULL) {
2479 if (afi == NULL)
2480 return -EAFNOSUPPORT;
2481
2482 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2483 genmask);
2484 if (IS_ERR(table))
2485 return PTR_ERR(table);
2486 }
2487
2488 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
2489 return 0;
2490 }
2491
2492 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2493 const struct nlattr *nla, u8 genmask)
2494 {
2495 struct nft_set *set;
2496
2497 if (nla == NULL)
2498 return ERR_PTR(-EINVAL);
2499
2500 list_for_each_entry(set, &table->sets, list) {
2501 if (!nla_strcmp(nla, set->name) &&
2502 nft_active_genmask(set, genmask))
2503 return set;
2504 }
2505 return ERR_PTR(-ENOENT);
2506 }
2507 EXPORT_SYMBOL_GPL(nf_tables_set_lookup);
2508
2509 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2510 const struct nlattr *nla,
2511 u8 genmask)
2512 {
2513 struct nft_trans *trans;
2514 u32 id = ntohl(nla_get_be32(nla));
2515
2516 list_for_each_entry(trans, &net->nft.commit_list, list) {
2517 struct nft_set *set = nft_trans_set(trans);
2518
2519 if (trans->msg_type == NFT_MSG_NEWSET &&
2520 id == nft_trans_set_id(trans) &&
2521 nft_active_genmask(set, genmask))
2522 return set;
2523 }
2524 return ERR_PTR(-ENOENT);
2525 }
2526 EXPORT_SYMBOL_GPL(nf_tables_set_lookup_byid);
2527
2528 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2529 const char *name)
2530 {
2531 const struct nft_set *i;
2532 const char *p;
2533 unsigned long *inuse;
2534 unsigned int n = 0, min = 0;
2535
2536 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
2537 if (p != NULL) {
2538 if (p[1] != 'd' || strchr(p + 2, '%'))
2539 return -EINVAL;
2540
2541 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2542 if (inuse == NULL)
2543 return -ENOMEM;
2544 cont:
2545 list_for_each_entry(i, &ctx->table->sets, list) {
2546 int tmp;
2547
2548 if (!nft_is_active_next(ctx->net, set))
2549 continue;
2550 if (!sscanf(i->name, name, &tmp))
2551 continue;
2552 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2553 continue;
2554
2555 set_bit(tmp - min, inuse);
2556 }
2557
2558 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2559 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2560 min += BITS_PER_BYTE * PAGE_SIZE;
2561 memset(inuse, 0, PAGE_SIZE);
2562 goto cont;
2563 }
2564 free_page((unsigned long)inuse);
2565 }
2566
2567 snprintf(set->name, sizeof(set->name), name, min + n);
2568 list_for_each_entry(i, &ctx->table->sets, list) {
2569 if (!nft_is_active_next(ctx->net, i))
2570 continue;
2571 if (!strcmp(set->name, i->name))
2572 return -ENFILE;
2573 }
2574 return 0;
2575 }
2576
2577 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2578 const struct nft_set *set, u16 event, u16 flags)
2579 {
2580 struct nfgenmsg *nfmsg;
2581 struct nlmsghdr *nlh;
2582 struct nlattr *desc;
2583 u32 portid = ctx->portid;
2584 u32 seq = ctx->seq;
2585
2586 event |= NFNL_SUBSYS_NFTABLES << 8;
2587 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2588 flags);
2589 if (nlh == NULL)
2590 goto nla_put_failure;
2591
2592 nfmsg = nlmsg_data(nlh);
2593 nfmsg->nfgen_family = ctx->afi->family;
2594 nfmsg->version = NFNETLINK_V0;
2595 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2596
2597 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2598 goto nla_put_failure;
2599 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2600 goto nla_put_failure;
2601 if (set->flags != 0)
2602 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2603 goto nla_put_failure;
2604
2605 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2606 goto nla_put_failure;
2607 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2608 goto nla_put_failure;
2609 if (set->flags & NFT_SET_MAP) {
2610 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2611 goto nla_put_failure;
2612 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2613 goto nla_put_failure;
2614 }
2615 if (set->flags & NFT_SET_OBJECT &&
2616 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
2617 goto nla_put_failure;
2618
2619 if (set->timeout &&
2620 nla_put_be64(skb, NFTA_SET_TIMEOUT,
2621 cpu_to_be64(jiffies_to_msecs(set->timeout)),
2622 NFTA_SET_PAD))
2623 goto nla_put_failure;
2624 if (set->gc_int &&
2625 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2626 goto nla_put_failure;
2627
2628 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2629 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2630 goto nla_put_failure;
2631 }
2632
2633 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2634 goto nla_put_failure;
2635
2636 desc = nla_nest_start(skb, NFTA_SET_DESC);
2637 if (desc == NULL)
2638 goto nla_put_failure;
2639 if (set->size &&
2640 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2641 goto nla_put_failure;
2642 nla_nest_end(skb, desc);
2643
2644 nlmsg_end(skb, nlh);
2645 return 0;
2646
2647 nla_put_failure:
2648 nlmsg_trim(skb, nlh);
2649 return -1;
2650 }
2651
2652 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2653 const struct nft_set *set,
2654 int event, gfp_t gfp_flags)
2655 {
2656 struct sk_buff *skb;
2657 u32 portid = ctx->portid;
2658 int err;
2659
2660 if (!ctx->report &&
2661 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2662 return 0;
2663
2664 err = -ENOBUFS;
2665 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2666 if (skb == NULL)
2667 goto err;
2668
2669 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2670 if (err < 0) {
2671 kfree_skb(skb);
2672 goto err;
2673 }
2674
2675 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2676 ctx->report, gfp_flags);
2677 err:
2678 if (err < 0)
2679 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2680 return err;
2681 }
2682
2683 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2684 {
2685 const struct nft_set *set;
2686 unsigned int idx, s_idx = cb->args[0];
2687 struct nft_af_info *afi;
2688 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2689 struct net *net = sock_net(skb->sk);
2690 int cur_family = cb->args[3];
2691 struct nft_ctx *ctx = cb->data, ctx_set;
2692
2693 if (cb->args[1])
2694 return skb->len;
2695
2696 rcu_read_lock();
2697 cb->seq = net->nft.base_seq;
2698
2699 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2700 if (ctx->afi && ctx->afi != afi)
2701 continue;
2702
2703 if (cur_family) {
2704 if (afi->family != cur_family)
2705 continue;
2706
2707 cur_family = 0;
2708 }
2709 list_for_each_entry_rcu(table, &afi->tables, list) {
2710 if (ctx->table && ctx->table != table)
2711 continue;
2712
2713 if (cur_table) {
2714 if (cur_table != table)
2715 continue;
2716
2717 cur_table = NULL;
2718 }
2719 idx = 0;
2720 list_for_each_entry_rcu(set, &table->sets, list) {
2721 if (idx < s_idx)
2722 goto cont;
2723 if (!nft_is_active(net, set))
2724 goto cont;
2725
2726 ctx_set = *ctx;
2727 ctx_set.table = table;
2728 ctx_set.afi = afi;
2729 if (nf_tables_fill_set(skb, &ctx_set, set,
2730 NFT_MSG_NEWSET,
2731 NLM_F_MULTI) < 0) {
2732 cb->args[0] = idx;
2733 cb->args[2] = (unsigned long) table;
2734 cb->args[3] = afi->family;
2735 goto done;
2736 }
2737 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2738 cont:
2739 idx++;
2740 }
2741 if (s_idx)
2742 s_idx = 0;
2743 }
2744 }
2745 cb->args[1] = 1;
2746 done:
2747 rcu_read_unlock();
2748 return skb->len;
2749 }
2750
2751 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2752 {
2753 kfree(cb->data);
2754 return 0;
2755 }
2756
2757 static int nf_tables_getset(struct net *net, struct sock *nlsk,
2758 struct sk_buff *skb, const struct nlmsghdr *nlh,
2759 const struct nlattr * const nla[])
2760 {
2761 u8 genmask = nft_genmask_cur(net);
2762 const struct nft_set *set;
2763 struct nft_ctx ctx;
2764 struct sk_buff *skb2;
2765 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2766 int err;
2767
2768 /* Verify existence before starting dump */
2769 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
2770 if (err < 0)
2771 return err;
2772
2773 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2774 struct netlink_dump_control c = {
2775 .dump = nf_tables_dump_sets,
2776 .done = nf_tables_dump_sets_done,
2777 };
2778 struct nft_ctx *ctx_dump;
2779
2780 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2781 if (ctx_dump == NULL)
2782 return -ENOMEM;
2783
2784 *ctx_dump = ctx;
2785 c.data = ctx_dump;
2786
2787 return netlink_dump_start(nlsk, skb, nlh, &c);
2788 }
2789
2790 /* Only accept unspec with dump */
2791 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2792 return -EAFNOSUPPORT;
2793 if (!nla[NFTA_SET_TABLE])
2794 return -EINVAL;
2795
2796 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
2797 if (IS_ERR(set))
2798 return PTR_ERR(set);
2799
2800 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2801 if (skb2 == NULL)
2802 return -ENOMEM;
2803
2804 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2805 if (err < 0)
2806 goto err;
2807
2808 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2809
2810 err:
2811 kfree_skb(skb2);
2812 return err;
2813 }
2814
2815 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2816 struct nft_set_desc *desc,
2817 const struct nlattr *nla)
2818 {
2819 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2820 int err;
2821
2822 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2823 if (err < 0)
2824 return err;
2825
2826 if (da[NFTA_SET_DESC_SIZE] != NULL)
2827 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2828
2829 return 0;
2830 }
2831
2832 static int nf_tables_newset(struct net *net, struct sock *nlsk,
2833 struct sk_buff *skb, const struct nlmsghdr *nlh,
2834 const struct nlattr * const nla[])
2835 {
2836 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2837 u8 genmask = nft_genmask_next(net);
2838 const struct nft_set_ops *ops;
2839 struct nft_af_info *afi;
2840 struct nft_table *table;
2841 struct nft_set *set;
2842 struct nft_ctx ctx;
2843 char name[NFT_SET_MAXNAMELEN];
2844 unsigned int size;
2845 bool create;
2846 u64 timeout;
2847 u32 ktype, dtype, flags, policy, gc_int, objtype;
2848 struct nft_set_desc desc;
2849 unsigned char *udata;
2850 u16 udlen;
2851 int err;
2852
2853 if (nla[NFTA_SET_TABLE] == NULL ||
2854 nla[NFTA_SET_NAME] == NULL ||
2855 nla[NFTA_SET_KEY_LEN] == NULL ||
2856 nla[NFTA_SET_ID] == NULL)
2857 return -EINVAL;
2858
2859 memset(&desc, 0, sizeof(desc));
2860
2861 ktype = NFT_DATA_VALUE;
2862 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2863 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2864 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2865 return -EINVAL;
2866 }
2867
2868 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2869 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
2870 return -EINVAL;
2871
2872 flags = 0;
2873 if (nla[NFTA_SET_FLAGS] != NULL) {
2874 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2875 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2876 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2877 NFT_SET_MAP | NFT_SET_EVAL |
2878 NFT_SET_OBJECT))
2879 return -EINVAL;
2880 /* Only one of these operations is supported */
2881 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
2882 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
2883 return -EOPNOTSUPP;
2884 }
2885
2886 dtype = 0;
2887 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2888 if (!(flags & NFT_SET_MAP))
2889 return -EINVAL;
2890
2891 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2892 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2893 dtype != NFT_DATA_VERDICT)
2894 return -EINVAL;
2895
2896 if (dtype != NFT_DATA_VERDICT) {
2897 if (nla[NFTA_SET_DATA_LEN] == NULL)
2898 return -EINVAL;
2899 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2900 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
2901 return -EINVAL;
2902 } else
2903 desc.dlen = sizeof(struct nft_verdict);
2904 } else if (flags & NFT_SET_MAP)
2905 return -EINVAL;
2906
2907 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
2908 if (!(flags & NFT_SET_OBJECT))
2909 return -EINVAL;
2910
2911 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
2912 if (objtype == NFT_OBJECT_UNSPEC ||
2913 objtype > NFT_OBJECT_MAX)
2914 return -EINVAL;
2915 } else if (flags & NFT_SET_OBJECT)
2916 return -EINVAL;
2917 else
2918 objtype = NFT_OBJECT_UNSPEC;
2919
2920 timeout = 0;
2921 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2922 if (!(flags & NFT_SET_TIMEOUT))
2923 return -EINVAL;
2924 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
2925 nla[NFTA_SET_TIMEOUT])));
2926 }
2927 gc_int = 0;
2928 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2929 if (!(flags & NFT_SET_TIMEOUT))
2930 return -EINVAL;
2931 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2932 }
2933
2934 policy = NFT_SET_POL_PERFORMANCE;
2935 if (nla[NFTA_SET_POLICY] != NULL)
2936 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2937
2938 if (nla[NFTA_SET_DESC] != NULL) {
2939 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2940 if (err < 0)
2941 return err;
2942 }
2943
2944 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2945
2946 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2947 if (IS_ERR(afi))
2948 return PTR_ERR(afi);
2949
2950 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
2951 if (IS_ERR(table))
2952 return PTR_ERR(table);
2953
2954 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
2955
2956 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
2957 if (IS_ERR(set)) {
2958 if (PTR_ERR(set) != -ENOENT)
2959 return PTR_ERR(set);
2960 set = NULL;
2961 }
2962
2963 if (set != NULL) {
2964 if (nlh->nlmsg_flags & NLM_F_EXCL)
2965 return -EEXIST;
2966 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2967 return -EOPNOTSUPP;
2968 return 0;
2969 }
2970
2971 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2972 return -ENOENT;
2973
2974 ops = nft_select_set_ops(nla, &desc, policy);
2975 if (IS_ERR(ops))
2976 return PTR_ERR(ops);
2977
2978 udlen = 0;
2979 if (nla[NFTA_SET_USERDATA])
2980 udlen = nla_len(nla[NFTA_SET_USERDATA]);
2981
2982 size = 0;
2983 if (ops->privsize != NULL)
2984 size = ops->privsize(nla);
2985
2986 err = -ENOMEM;
2987 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
2988 if (set == NULL)
2989 goto err1;
2990
2991 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2992 err = nf_tables_set_alloc_name(&ctx, set, name);
2993 if (err < 0)
2994 goto err2;
2995
2996 udata = NULL;
2997 if (udlen) {
2998 udata = set->data + size;
2999 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3000 }
3001
3002 INIT_LIST_HEAD(&set->bindings);
3003 set->ops = ops;
3004 set->ktype = ktype;
3005 set->klen = desc.klen;
3006 set->dtype = dtype;
3007 set->objtype = objtype;
3008 set->dlen = desc.dlen;
3009 set->flags = flags;
3010 set->size = desc.size;
3011 set->policy = policy;
3012 set->udlen = udlen;
3013 set->udata = udata;
3014 set->timeout = timeout;
3015 set->gc_int = gc_int;
3016
3017 err = ops->init(set, &desc, nla);
3018 if (err < 0)
3019 goto err2;
3020
3021 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3022 if (err < 0)
3023 goto err3;
3024
3025 list_add_tail_rcu(&set->list, &table->sets);
3026 table->use++;
3027 return 0;
3028
3029 err3:
3030 ops->destroy(set);
3031 err2:
3032 kfree(set);
3033 err1:
3034 module_put(ops->owner);
3035 return err;
3036 }
3037
3038 static void nft_set_destroy(struct nft_set *set)
3039 {
3040 set->ops->destroy(set);
3041 module_put(set->ops->owner);
3042 kfree(set);
3043 }
3044
3045 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3046 {
3047 list_del_rcu(&set->list);
3048 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
3049 nft_set_destroy(set);
3050 }
3051
3052 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3053 struct sk_buff *skb, const struct nlmsghdr *nlh,
3054 const struct nlattr * const nla[])
3055 {
3056 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3057 u8 genmask = nft_genmask_next(net);
3058 struct nft_set *set;
3059 struct nft_ctx ctx;
3060 int err;
3061
3062 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3063 return -EAFNOSUPPORT;
3064 if (nla[NFTA_SET_TABLE] == NULL)
3065 return -EINVAL;
3066
3067 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
3068 if (err < 0)
3069 return err;
3070
3071 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3072 if (IS_ERR(set))
3073 return PTR_ERR(set);
3074 if (!list_empty(&set->bindings))
3075 return -EBUSY;
3076
3077 return nft_delset(&ctx, set);
3078 }
3079
3080 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3081 const struct nft_set *set,
3082 const struct nft_set_iter *iter,
3083 const struct nft_set_elem *elem)
3084 {
3085 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3086 enum nft_registers dreg;
3087
3088 dreg = nft_type_to_reg(set->dtype);
3089 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3090 set->dtype == NFT_DATA_VERDICT ?
3091 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3092 set->dlen);
3093 }
3094
3095 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3096 struct nft_set_binding *binding)
3097 {
3098 struct nft_set_binding *i;
3099 struct nft_set_iter iter;
3100
3101 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
3102 return -EBUSY;
3103
3104 if (binding->flags & NFT_SET_MAP) {
3105 /* If the set is already bound to the same chain all
3106 * jumps are already validated for that chain.
3107 */
3108 list_for_each_entry(i, &set->bindings, list) {
3109 if (i->flags & NFT_SET_MAP &&
3110 i->chain == binding->chain)
3111 goto bind;
3112 }
3113
3114 iter.genmask = nft_genmask_next(ctx->net);
3115 iter.skip = 0;
3116 iter.count = 0;
3117 iter.err = 0;
3118 iter.fn = nf_tables_bind_check_setelem;
3119
3120 set->ops->walk(ctx, set, &iter);
3121 if (iter.err < 0)
3122 return iter.err;
3123 }
3124 bind:
3125 binding->chain = ctx->chain;
3126 list_add_tail_rcu(&binding->list, &set->bindings);
3127 return 0;
3128 }
3129 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3130
3131 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3132 struct nft_set_binding *binding)
3133 {
3134 list_del_rcu(&binding->list);
3135
3136 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
3137 nft_is_active(ctx->net, set))
3138 nf_tables_set_destroy(ctx, set);
3139 }
3140 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3141
3142 const struct nft_set_ext_type nft_set_ext_types[] = {
3143 [NFT_SET_EXT_KEY] = {
3144 .align = __alignof__(u32),
3145 },
3146 [NFT_SET_EXT_DATA] = {
3147 .align = __alignof__(u32),
3148 },
3149 [NFT_SET_EXT_EXPR] = {
3150 .align = __alignof__(struct nft_expr),
3151 },
3152 [NFT_SET_EXT_OBJREF] = {
3153 .len = sizeof(struct nft_object *),
3154 .align = __alignof__(struct nft_object *),
3155 },
3156 [NFT_SET_EXT_FLAGS] = {
3157 .len = sizeof(u8),
3158 .align = __alignof__(u8),
3159 },
3160 [NFT_SET_EXT_TIMEOUT] = {
3161 .len = sizeof(u64),
3162 .align = __alignof__(u64),
3163 },
3164 [NFT_SET_EXT_EXPIRATION] = {
3165 .len = sizeof(unsigned long),
3166 .align = __alignof__(unsigned long),
3167 },
3168 [NFT_SET_EXT_USERDATA] = {
3169 .len = sizeof(struct nft_userdata),
3170 .align = __alignof__(struct nft_userdata),
3171 },
3172 };
3173 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3174
3175 /*
3176 * Set elements
3177 */
3178
3179 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3180 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3181 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3182 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3183 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3184 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3185 .len = NFT_USERDATA_MAXLEN },
3186 };
3187
3188 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3189 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
3190 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
3191 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3192 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3193 };
3194
3195 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3196 const struct sk_buff *skb,
3197 const struct nlmsghdr *nlh,
3198 const struct nlattr * const nla[],
3199 u8 genmask)
3200 {
3201 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3202 struct nft_af_info *afi;
3203 struct nft_table *table;
3204
3205 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3206 if (IS_ERR(afi))
3207 return PTR_ERR(afi);
3208
3209 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3210 genmask);
3211 if (IS_ERR(table))
3212 return PTR_ERR(table);
3213
3214 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
3215 return 0;
3216 }
3217
3218 static int nf_tables_fill_setelem(struct sk_buff *skb,
3219 const struct nft_set *set,
3220 const struct nft_set_elem *elem)
3221 {
3222 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3223 unsigned char *b = skb_tail_pointer(skb);
3224 struct nlattr *nest;
3225
3226 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3227 if (nest == NULL)
3228 goto nla_put_failure;
3229
3230 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3231 NFT_DATA_VALUE, set->klen) < 0)
3232 goto nla_put_failure;
3233
3234 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3235 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3236 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3237 set->dlen) < 0)
3238 goto nla_put_failure;
3239
3240 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3241 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3242 goto nla_put_failure;
3243
3244 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3245 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3246 (*nft_set_ext_obj(ext))->name) < 0)
3247 goto nla_put_failure;
3248
3249 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3250 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3251 htonl(*nft_set_ext_flags(ext))))
3252 goto nla_put_failure;
3253
3254 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3255 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3256 cpu_to_be64(jiffies_to_msecs(
3257 *nft_set_ext_timeout(ext))),
3258 NFTA_SET_ELEM_PAD))
3259 goto nla_put_failure;
3260
3261 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3262 unsigned long expires, now = jiffies;
3263
3264 expires = *nft_set_ext_expiration(ext);
3265 if (time_before(now, expires))
3266 expires -= now;
3267 else
3268 expires = 0;
3269
3270 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3271 cpu_to_be64(jiffies_to_msecs(expires)),
3272 NFTA_SET_ELEM_PAD))
3273 goto nla_put_failure;
3274 }
3275
3276 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3277 struct nft_userdata *udata;
3278
3279 udata = nft_set_ext_userdata(ext);
3280 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3281 udata->len + 1, udata->data))
3282 goto nla_put_failure;
3283 }
3284
3285 nla_nest_end(skb, nest);
3286 return 0;
3287
3288 nla_put_failure:
3289 nlmsg_trim(skb, b);
3290 return -EMSGSIZE;
3291 }
3292
3293 struct nft_set_dump_args {
3294 const struct netlink_callback *cb;
3295 struct nft_set_iter iter;
3296 struct sk_buff *skb;
3297 };
3298
3299 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3300 const struct nft_set *set,
3301 const struct nft_set_iter *iter,
3302 const struct nft_set_elem *elem)
3303 {
3304 struct nft_set_dump_args *args;
3305
3306 args = container_of(iter, struct nft_set_dump_args, iter);
3307 return nf_tables_fill_setelem(args->skb, set, elem);
3308 }
3309
3310 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3311 {
3312 struct net *net = sock_net(skb->sk);
3313 u8 genmask = nft_genmask_cur(net);
3314 const struct nft_set *set;
3315 struct nft_set_dump_args args;
3316 struct nft_ctx ctx;
3317 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3318 struct nfgenmsg *nfmsg;
3319 struct nlmsghdr *nlh;
3320 struct nlattr *nest;
3321 u32 portid, seq;
3322 int event, err;
3323
3324 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3325 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
3326 if (err < 0)
3327 return err;
3328
3329 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
3330 (void *)nla, genmask);
3331 if (err < 0)
3332 return err;
3333
3334 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3335 genmask);
3336 if (IS_ERR(set))
3337 return PTR_ERR(set);
3338
3339 event = NFT_MSG_NEWSETELEM;
3340 event |= NFNL_SUBSYS_NFTABLES << 8;
3341 portid = NETLINK_CB(cb->skb).portid;
3342 seq = cb->nlh->nlmsg_seq;
3343
3344 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3345 NLM_F_MULTI);
3346 if (nlh == NULL)
3347 goto nla_put_failure;
3348
3349 nfmsg = nlmsg_data(nlh);
3350 nfmsg->nfgen_family = ctx.afi->family;
3351 nfmsg->version = NFNETLINK_V0;
3352 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
3353
3354 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3355 goto nla_put_failure;
3356 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3357 goto nla_put_failure;
3358
3359 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3360 if (nest == NULL)
3361 goto nla_put_failure;
3362
3363 args.cb = cb;
3364 args.skb = skb;
3365 args.iter.genmask = nft_genmask_cur(ctx.net);
3366 args.iter.skip = cb->args[0];
3367 args.iter.count = 0;
3368 args.iter.err = 0;
3369 args.iter.fn = nf_tables_dump_setelem;
3370 set->ops->walk(&ctx, set, &args.iter);
3371
3372 nla_nest_end(skb, nest);
3373 nlmsg_end(skb, nlh);
3374
3375 if (args.iter.err && args.iter.err != -EMSGSIZE)
3376 return args.iter.err;
3377 if (args.iter.count == cb->args[0])
3378 return 0;
3379
3380 cb->args[0] = args.iter.count;
3381 return skb->len;
3382
3383 nla_put_failure:
3384 return -ENOSPC;
3385 }
3386
3387 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3388 struct sk_buff *skb, const struct nlmsghdr *nlh,
3389 const struct nlattr * const nla[])
3390 {
3391 u8 genmask = nft_genmask_cur(net);
3392 const struct nft_set *set;
3393 struct nft_ctx ctx;
3394 int err;
3395
3396 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3397 if (err < 0)
3398 return err;
3399
3400 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3401 genmask);
3402 if (IS_ERR(set))
3403 return PTR_ERR(set);
3404
3405 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3406 struct netlink_dump_control c = {
3407 .dump = nf_tables_dump_set,
3408 };
3409 return netlink_dump_start(nlsk, skb, nlh, &c);
3410 }
3411 return -EOPNOTSUPP;
3412 }
3413
3414 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3415 const struct nft_ctx *ctx, u32 seq,
3416 u32 portid, int event, u16 flags,
3417 const struct nft_set *set,
3418 const struct nft_set_elem *elem)
3419 {
3420 struct nfgenmsg *nfmsg;
3421 struct nlmsghdr *nlh;
3422 struct nlattr *nest;
3423 int err;
3424
3425 event |= NFNL_SUBSYS_NFTABLES << 8;
3426 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3427 flags);
3428 if (nlh == NULL)
3429 goto nla_put_failure;
3430
3431 nfmsg = nlmsg_data(nlh);
3432 nfmsg->nfgen_family = ctx->afi->family;
3433 nfmsg->version = NFNETLINK_V0;
3434 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3435
3436 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3437 goto nla_put_failure;
3438 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3439 goto nla_put_failure;
3440
3441 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3442 if (nest == NULL)
3443 goto nla_put_failure;
3444
3445 err = nf_tables_fill_setelem(skb, set, elem);
3446 if (err < 0)
3447 goto nla_put_failure;
3448
3449 nla_nest_end(skb, nest);
3450
3451 nlmsg_end(skb, nlh);
3452 return 0;
3453
3454 nla_put_failure:
3455 nlmsg_trim(skb, nlh);
3456 return -1;
3457 }
3458
3459 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3460 const struct nft_set *set,
3461 const struct nft_set_elem *elem,
3462 int event, u16 flags)
3463 {
3464 struct net *net = ctx->net;
3465 u32 portid = ctx->portid;
3466 struct sk_buff *skb;
3467 int err;
3468
3469 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3470 return 0;
3471
3472 err = -ENOBUFS;
3473 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3474 if (skb == NULL)
3475 goto err;
3476
3477 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3478 set, elem);
3479 if (err < 0) {
3480 kfree_skb(skb);
3481 goto err;
3482 }
3483
3484 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3485 GFP_KERNEL);
3486 err:
3487 if (err < 0)
3488 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3489 return err;
3490 }
3491
3492 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3493 int msg_type,
3494 struct nft_set *set)
3495 {
3496 struct nft_trans *trans;
3497
3498 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3499 if (trans == NULL)
3500 return NULL;
3501
3502 nft_trans_elem_set(trans) = set;
3503 return trans;
3504 }
3505
3506 void *nft_set_elem_init(const struct nft_set *set,
3507 const struct nft_set_ext_tmpl *tmpl,
3508 const u32 *key, const u32 *data,
3509 u64 timeout, gfp_t gfp)
3510 {
3511 struct nft_set_ext *ext;
3512 void *elem;
3513
3514 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3515 if (elem == NULL)
3516 return NULL;
3517
3518 ext = nft_set_elem_ext(set, elem);
3519 nft_set_ext_init(ext, tmpl);
3520
3521 memcpy(nft_set_ext_key(ext), key, set->klen);
3522 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3523 memcpy(nft_set_ext_data(ext), data, set->dlen);
3524 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3525 *nft_set_ext_expiration(ext) =
3526 jiffies + timeout;
3527 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3528 *nft_set_ext_timeout(ext) = timeout;
3529
3530 return elem;
3531 }
3532
3533 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
3534 bool destroy_expr)
3535 {
3536 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3537
3538 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3539 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3540 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
3541 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3542 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3543 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
3544 (*nft_set_ext_obj(ext))->use--;
3545 kfree(elem);
3546 }
3547 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3548
3549 static int nft_setelem_parse_flags(const struct nft_set *set,
3550 const struct nlattr *attr, u32 *flags)
3551 {
3552 if (attr == NULL)
3553 return 0;
3554
3555 *flags = ntohl(nla_get_be32(attr));
3556 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3557 return -EINVAL;
3558 if (!(set->flags & NFT_SET_INTERVAL) &&
3559 *flags & NFT_SET_ELEM_INTERVAL_END)
3560 return -EINVAL;
3561
3562 return 0;
3563 }
3564
3565 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3566 const struct nlattr *attr, u32 nlmsg_flags)
3567 {
3568 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3569 u8 genmask = nft_genmask_next(ctx->net);
3570 struct nft_data_desc d1, d2;
3571 struct nft_set_ext_tmpl tmpl;
3572 struct nft_set_ext *ext, *ext2;
3573 struct nft_set_elem elem;
3574 struct nft_set_binding *binding;
3575 struct nft_object *obj = NULL;
3576 struct nft_userdata *udata;
3577 struct nft_data data;
3578 enum nft_registers dreg;
3579 struct nft_trans *trans;
3580 u32 flags = 0;
3581 u64 timeout;
3582 u8 ulen;
3583 int err;
3584
3585 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3586 nft_set_elem_policy);
3587 if (err < 0)
3588 return err;
3589
3590 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3591 return -EINVAL;
3592
3593 nft_set_ext_prepare(&tmpl);
3594
3595 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3596 if (err < 0)
3597 return err;
3598 if (flags != 0)
3599 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3600
3601 if (set->flags & NFT_SET_MAP) {
3602 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3603 !(flags & NFT_SET_ELEM_INTERVAL_END))
3604 return -EINVAL;
3605 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3606 flags & NFT_SET_ELEM_INTERVAL_END)
3607 return -EINVAL;
3608 } else {
3609 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3610 return -EINVAL;
3611 }
3612
3613 timeout = 0;
3614 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3615 if (!(set->flags & NFT_SET_TIMEOUT))
3616 return -EINVAL;
3617 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3618 nla[NFTA_SET_ELEM_TIMEOUT])));
3619 } else if (set->flags & NFT_SET_TIMEOUT) {
3620 timeout = set->timeout;
3621 }
3622
3623 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3624 nla[NFTA_SET_ELEM_KEY]);
3625 if (err < 0)
3626 goto err1;
3627 err = -EINVAL;
3628 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3629 goto err2;
3630
3631 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3632 if (timeout > 0) {
3633 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3634 if (timeout != set->timeout)
3635 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3636 }
3637
3638 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
3639 if (!(set->flags & NFT_SET_OBJECT)) {
3640 err = -EINVAL;
3641 goto err2;
3642 }
3643 obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
3644 set->objtype, genmask);
3645 if (IS_ERR(obj)) {
3646 err = PTR_ERR(obj);
3647 goto err2;
3648 }
3649 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
3650 }
3651
3652 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3653 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3654 nla[NFTA_SET_ELEM_DATA]);
3655 if (err < 0)
3656 goto err2;
3657
3658 err = -EINVAL;
3659 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3660 goto err3;
3661
3662 dreg = nft_type_to_reg(set->dtype);
3663 list_for_each_entry(binding, &set->bindings, list) {
3664 struct nft_ctx bind_ctx = {
3665 .net = ctx->net,
3666 .afi = ctx->afi,
3667 .table = ctx->table,
3668 .chain = (struct nft_chain *)binding->chain,
3669 };
3670
3671 if (!(binding->flags & NFT_SET_MAP))
3672 continue;
3673
3674 err = nft_validate_register_store(&bind_ctx, dreg,
3675 &data,
3676 d2.type, d2.len);
3677 if (err < 0)
3678 goto err3;
3679 }
3680
3681 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
3682 }
3683
3684 /* The full maximum length of userdata can exceed the maximum
3685 * offset value (U8_MAX) for following extensions, therefor it
3686 * must be the last extension added.
3687 */
3688 ulen = 0;
3689 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3690 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3691 if (ulen > 0)
3692 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3693 ulen);
3694 }
3695
3696 err = -ENOMEM;
3697 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
3698 timeout, GFP_KERNEL);
3699 if (elem.priv == NULL)
3700 goto err3;
3701
3702 ext = nft_set_elem_ext(set, elem.priv);
3703 if (flags)
3704 *nft_set_ext_flags(ext) = flags;
3705 if (ulen > 0) {
3706 udata = nft_set_ext_userdata(ext);
3707 udata->len = ulen - 1;
3708 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3709 }
3710 if (obj) {
3711 *nft_set_ext_obj(ext) = obj;
3712 obj->use++;
3713 }
3714
3715 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3716 if (trans == NULL)
3717 goto err4;
3718
3719 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
3720 err = set->ops->insert(ctx->net, set, &elem, &ext2);
3721 if (err) {
3722 if (err == -EEXIST) {
3723 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3724 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
3725 memcmp(nft_set_ext_data(ext),
3726 nft_set_ext_data(ext2), set->dlen) != 0) ||
3727 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3728 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
3729 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
3730 err = -EBUSY;
3731 else if (!(nlmsg_flags & NLM_F_EXCL))
3732 err = 0;
3733 }
3734 goto err5;
3735 }
3736
3737 nft_trans_elem(trans) = elem;
3738 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3739 return 0;
3740
3741 err5:
3742 kfree(trans);
3743 err4:
3744 kfree(elem.priv);
3745 err3:
3746 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3747 nft_data_uninit(&data, d2.type);
3748 err2:
3749 nft_data_uninit(&elem.key.val, d1.type);
3750 err1:
3751 return err;
3752 }
3753
3754 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3755 struct sk_buff *skb, const struct nlmsghdr *nlh,
3756 const struct nlattr * const nla[])
3757 {
3758 u8 genmask = nft_genmask_next(net);
3759 const struct nlattr *attr;
3760 struct nft_set *set;
3761 struct nft_ctx ctx;
3762 int rem, err = 0;
3763
3764 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3765 return -EINVAL;
3766
3767 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3768 if (err < 0)
3769 return err;
3770
3771 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3772 genmask);
3773 if (IS_ERR(set)) {
3774 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3775 set = nf_tables_set_lookup_byid(net,
3776 nla[NFTA_SET_ELEM_LIST_SET_ID],
3777 genmask);
3778 }
3779 if (IS_ERR(set))
3780 return PTR_ERR(set);
3781 }
3782
3783 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3784 return -EBUSY;
3785
3786 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3787 if (set->size &&
3788 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact))
3789 return -ENFILE;
3790
3791 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
3792 if (err < 0) {
3793 atomic_dec(&set->nelems);
3794 break;
3795 }
3796 }
3797 return err;
3798 }
3799
3800 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3801 const struct nlattr *attr)
3802 {
3803 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3804 struct nft_set_ext_tmpl tmpl;
3805 struct nft_data_desc desc;
3806 struct nft_set_elem elem;
3807 struct nft_set_ext *ext;
3808 struct nft_trans *trans;
3809 u32 flags = 0;
3810 void *priv;
3811 int err;
3812
3813 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3814 nft_set_elem_policy);
3815 if (err < 0)
3816 goto err1;
3817
3818 err = -EINVAL;
3819 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3820 goto err1;
3821
3822 nft_set_ext_prepare(&tmpl);
3823
3824 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3825 if (err < 0)
3826 return err;
3827 if (flags != 0)
3828 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3829
3830 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3831 nla[NFTA_SET_ELEM_KEY]);
3832 if (err < 0)
3833 goto err1;
3834
3835 err = -EINVAL;
3836 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3837 goto err2;
3838
3839 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3840
3841 err = -ENOMEM;
3842 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3843 GFP_KERNEL);
3844 if (elem.priv == NULL)
3845 goto err2;
3846
3847 ext = nft_set_elem_ext(set, elem.priv);
3848 if (flags)
3849 *nft_set_ext_flags(ext) = flags;
3850
3851 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3852 if (trans == NULL) {
3853 err = -ENOMEM;
3854 goto err3;
3855 }
3856
3857 priv = set->ops->deactivate(ctx->net, set, &elem);
3858 if (priv == NULL) {
3859 err = -ENOENT;
3860 goto err4;
3861 }
3862 kfree(elem.priv);
3863 elem.priv = priv;
3864
3865 nft_trans_elem(trans) = elem;
3866 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3867 return 0;
3868
3869 err4:
3870 kfree(trans);
3871 err3:
3872 kfree(elem.priv);
3873 err2:
3874 nft_data_uninit(&elem.key.val, desc.type);
3875 err1:
3876 return err;
3877 }
3878
3879 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3880 struct sk_buff *skb, const struct nlmsghdr *nlh,
3881 const struct nlattr * const nla[])
3882 {
3883 u8 genmask = nft_genmask_next(net);
3884 const struct nlattr *attr;
3885 struct nft_set *set;
3886 struct nft_ctx ctx;
3887 int rem, err = 0;
3888
3889 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3890 return -EINVAL;
3891
3892 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3893 if (err < 0)
3894 return err;
3895
3896 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3897 genmask);
3898 if (IS_ERR(set))
3899 return PTR_ERR(set);
3900 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3901 return -EBUSY;
3902
3903 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3904 err = nft_del_setelem(&ctx, set, attr);
3905 if (err < 0)
3906 break;
3907
3908 set->ndeact++;
3909 }
3910 return err;
3911 }
3912
3913 void nft_set_gc_batch_release(struct rcu_head *rcu)
3914 {
3915 struct nft_set_gc_batch *gcb;
3916 unsigned int i;
3917
3918 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
3919 for (i = 0; i < gcb->head.cnt; i++)
3920 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
3921 kfree(gcb);
3922 }
3923 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
3924
3925 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
3926 gfp_t gfp)
3927 {
3928 struct nft_set_gc_batch *gcb;
3929
3930 gcb = kzalloc(sizeof(*gcb), gfp);
3931 if (gcb == NULL)
3932 return gcb;
3933 gcb->head.set = set;
3934 return gcb;
3935 }
3936 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
3937
3938 /*
3939 * Stateful objects
3940 */
3941
3942 /**
3943 * nft_register_obj- register nf_tables stateful object type
3944 * @obj: object type
3945 *
3946 * Registers the object type for use with nf_tables. Returns zero on
3947 * success or a negative errno code otherwise.
3948 */
3949 int nft_register_obj(struct nft_object_type *obj_type)
3950 {
3951 if (obj_type->type == NFT_OBJECT_UNSPEC)
3952 return -EINVAL;
3953
3954 nfnl_lock(NFNL_SUBSYS_NFTABLES);
3955 list_add_rcu(&obj_type->list, &nf_tables_objects);
3956 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3957 return 0;
3958 }
3959 EXPORT_SYMBOL_GPL(nft_register_obj);
3960
3961 /**
3962 * nft_unregister_obj - unregister nf_tables object type
3963 * @obj: object type
3964 *
3965 * Unregisters the object type for use with nf_tables.
3966 */
3967 void nft_unregister_obj(struct nft_object_type *obj_type)
3968 {
3969 nfnl_lock(NFNL_SUBSYS_NFTABLES);
3970 list_del_rcu(&obj_type->list);
3971 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3972 }
3973 EXPORT_SYMBOL_GPL(nft_unregister_obj);
3974
3975 struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
3976 const struct nlattr *nla,
3977 u32 objtype, u8 genmask)
3978 {
3979 struct nft_object *obj;
3980
3981 list_for_each_entry(obj, &table->objects, list) {
3982 if (!nla_strcmp(nla, obj->name) &&
3983 objtype == obj->type->type &&
3984 nft_active_genmask(obj, genmask))
3985 return obj;
3986 }
3987 return ERR_PTR(-ENOENT);
3988 }
3989 EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
3990
3991 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
3992 [NFTA_OBJ_TABLE] = { .type = NLA_STRING },
3993 [NFTA_OBJ_NAME] = { .type = NLA_STRING },
3994 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
3995 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
3996 };
3997
3998 static struct nft_object *nft_obj_init(const struct nft_object_type *type,
3999 const struct nlattr *attr)
4000 {
4001 struct nlattr *tb[type->maxattr + 1];
4002 struct nft_object *obj;
4003 int err;
4004
4005 if (attr) {
4006 err = nla_parse_nested(tb, type->maxattr, attr, type->policy);
4007 if (err < 0)
4008 goto err1;
4009 } else {
4010 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4011 }
4012
4013 err = -ENOMEM;
4014 obj = kzalloc(sizeof(struct nft_object) + type->size, GFP_KERNEL);
4015 if (obj == NULL)
4016 goto err1;
4017
4018 err = type->init((const struct nlattr * const *)tb, obj);
4019 if (err < 0)
4020 goto err2;
4021
4022 obj->type = type;
4023 return obj;
4024 err2:
4025 kfree(obj);
4026 err1:
4027 return ERR_PTR(err);
4028 }
4029
4030 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
4031 struct nft_object *obj, bool reset)
4032 {
4033 struct nlattr *nest;
4034
4035 nest = nla_nest_start(skb, attr);
4036 if (!nest)
4037 goto nla_put_failure;
4038 if (obj->type->dump(skb, obj, reset) < 0)
4039 goto nla_put_failure;
4040 nla_nest_end(skb, nest);
4041 return 0;
4042
4043 nla_put_failure:
4044 return -1;
4045 }
4046
4047 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4048 {
4049 const struct nft_object_type *type;
4050
4051 list_for_each_entry(type, &nf_tables_objects, list) {
4052 if (objtype == type->type)
4053 return type;
4054 }
4055 return NULL;
4056 }
4057
4058 static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4059 {
4060 const struct nft_object_type *type;
4061
4062 type = __nft_obj_type_get(objtype);
4063 if (type != NULL && try_module_get(type->owner))
4064 return type;
4065
4066 #ifdef CONFIG_MODULES
4067 if (type == NULL) {
4068 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4069 request_module("nft-obj-%u", objtype);
4070 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4071 if (__nft_obj_type_get(objtype))
4072 return ERR_PTR(-EAGAIN);
4073 }
4074 #endif
4075 return ERR_PTR(-ENOENT);
4076 }
4077
4078 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4079 struct sk_buff *skb, const struct nlmsghdr *nlh,
4080 const struct nlattr * const nla[])
4081 {
4082 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4083 const struct nft_object_type *type;
4084 u8 genmask = nft_genmask_next(net);
4085 int family = nfmsg->nfgen_family;
4086 struct nft_af_info *afi;
4087 struct nft_table *table;
4088 struct nft_object *obj;
4089 struct nft_ctx ctx;
4090 u32 objtype;
4091 int err;
4092
4093 if (!nla[NFTA_OBJ_TYPE] ||
4094 !nla[NFTA_OBJ_NAME] ||
4095 !nla[NFTA_OBJ_DATA])
4096 return -EINVAL;
4097
4098 afi = nf_tables_afinfo_lookup(net, family, true);
4099 if (IS_ERR(afi))
4100 return PTR_ERR(afi);
4101
4102 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4103 if (IS_ERR(table))
4104 return PTR_ERR(table);
4105
4106 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4107 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4108 if (IS_ERR(obj)) {
4109 err = PTR_ERR(obj);
4110 if (err != -ENOENT)
4111 return err;
4112
4113 obj = NULL;
4114 }
4115
4116 if (obj != NULL) {
4117 if (nlh->nlmsg_flags & NLM_F_EXCL)
4118 return -EEXIST;
4119
4120 return 0;
4121 }
4122
4123 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4124
4125 type = nft_obj_type_get(objtype);
4126 if (IS_ERR(type))
4127 return PTR_ERR(type);
4128
4129 obj = nft_obj_init(type, nla[NFTA_OBJ_DATA]);
4130 if (IS_ERR(obj)) {
4131 err = PTR_ERR(obj);
4132 goto err1;
4133 }
4134 obj->table = table;
4135 nla_strlcpy(obj->name, nla[NFTA_OBJ_NAME], NFT_OBJ_MAXNAMELEN);
4136
4137 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4138 if (err < 0)
4139 goto err2;
4140
4141 list_add_tail_rcu(&obj->list, &table->objects);
4142 table->use++;
4143 return 0;
4144 err2:
4145 if (obj->type->destroy)
4146 obj->type->destroy(obj);
4147 kfree(obj);
4148 err1:
4149 module_put(type->owner);
4150 return err;
4151 }
4152
4153 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4154 u32 portid, u32 seq, int event, u32 flags,
4155 int family, const struct nft_table *table,
4156 struct nft_object *obj, bool reset)
4157 {
4158 struct nfgenmsg *nfmsg;
4159 struct nlmsghdr *nlh;
4160
4161 event |= NFNL_SUBSYS_NFTABLES << 8;
4162 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4163 if (nlh == NULL)
4164 goto nla_put_failure;
4165
4166 nfmsg = nlmsg_data(nlh);
4167 nfmsg->nfgen_family = family;
4168 nfmsg->version = NFNETLINK_V0;
4169 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4170
4171 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4172 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
4173 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->type->type)) ||
4174 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
4175 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
4176 goto nla_put_failure;
4177
4178 nlmsg_end(skb, nlh);
4179 return 0;
4180
4181 nla_put_failure:
4182 nlmsg_trim(skb, nlh);
4183 return -1;
4184 }
4185
4186 struct nft_obj_filter {
4187 char table[NFT_OBJ_MAXNAMELEN];
4188 u32 type;
4189 };
4190
4191 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4192 {
4193 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4194 const struct nft_af_info *afi;
4195 const struct nft_table *table;
4196 unsigned int idx = 0, s_idx = cb->args[0];
4197 struct nft_obj_filter *filter = cb->data;
4198 struct net *net = sock_net(skb->sk);
4199 int family = nfmsg->nfgen_family;
4200 struct nft_object *obj;
4201 bool reset = false;
4202
4203 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4204 reset = true;
4205
4206 rcu_read_lock();
4207 cb->seq = net->nft.base_seq;
4208
4209 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
4210 if (family != NFPROTO_UNSPEC && family != afi->family)
4211 continue;
4212
4213 list_for_each_entry_rcu(table, &afi->tables, list) {
4214 list_for_each_entry_rcu(obj, &table->objects, list) {
4215 if (!nft_is_active(net, obj))
4216 goto cont;
4217 if (idx < s_idx)
4218 goto cont;
4219 if (idx > s_idx)
4220 memset(&cb->args[1], 0,
4221 sizeof(cb->args) - sizeof(cb->args[0]));
4222 if (filter->table[0] &&
4223 strcmp(filter->table, table->name))
4224 goto cont;
4225 if (filter->type != NFT_OBJECT_UNSPEC &&
4226 obj->type->type != filter->type)
4227 goto cont;
4228
4229 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4230 cb->nlh->nlmsg_seq,
4231 NFT_MSG_NEWOBJ,
4232 NLM_F_MULTI | NLM_F_APPEND,
4233 afi->family, table, obj, reset) < 0)
4234 goto done;
4235
4236 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4237 cont:
4238 idx++;
4239 }
4240 }
4241 }
4242 done:
4243 rcu_read_unlock();
4244
4245 cb->args[0] = idx;
4246 return skb->len;
4247 }
4248
4249 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4250 {
4251 kfree(cb->data);
4252
4253 return 0;
4254 }
4255
4256 static struct nft_obj_filter *
4257 nft_obj_filter_alloc(const struct nlattr * const nla[])
4258 {
4259 struct nft_obj_filter *filter;
4260
4261 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
4262 if (!filter)
4263 return ERR_PTR(-ENOMEM);
4264
4265 if (nla[NFTA_OBJ_TABLE])
4266 nla_strlcpy(filter->table, nla[NFTA_OBJ_TABLE],
4267 NFT_TABLE_MAXNAMELEN);
4268 if (nla[NFTA_OBJ_TYPE])
4269 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4270
4271 return filter;
4272 }
4273
4274 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
4275 struct sk_buff *skb, const struct nlmsghdr *nlh,
4276 const struct nlattr * const nla[])
4277 {
4278 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4279 u8 genmask = nft_genmask_cur(net);
4280 int family = nfmsg->nfgen_family;
4281 const struct nft_af_info *afi;
4282 const struct nft_table *table;
4283 struct nft_object *obj;
4284 struct sk_buff *skb2;
4285 bool reset = false;
4286 u32 objtype;
4287 int err;
4288
4289 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4290 struct netlink_dump_control c = {
4291 .dump = nf_tables_dump_obj,
4292 .done = nf_tables_dump_obj_done,
4293 };
4294
4295 if (nla[NFTA_OBJ_TABLE] ||
4296 nla[NFTA_OBJ_TYPE]) {
4297 struct nft_obj_filter *filter;
4298
4299 filter = nft_obj_filter_alloc(nla);
4300 if (IS_ERR(filter))
4301 return -ENOMEM;
4302
4303 c.data = filter;
4304 }
4305 return netlink_dump_start(nlsk, skb, nlh, &c);
4306 }
4307
4308 if (!nla[NFTA_OBJ_NAME] ||
4309 !nla[NFTA_OBJ_TYPE])
4310 return -EINVAL;
4311
4312 afi = nf_tables_afinfo_lookup(net, family, false);
4313 if (IS_ERR(afi))
4314 return PTR_ERR(afi);
4315
4316 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4317 if (IS_ERR(table))
4318 return PTR_ERR(table);
4319
4320 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4321 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4322 if (IS_ERR(obj))
4323 return PTR_ERR(obj);
4324
4325 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4326 if (!skb2)
4327 return -ENOMEM;
4328
4329 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4330 reset = true;
4331
4332 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
4333 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
4334 family, table, obj, reset);
4335 if (err < 0)
4336 goto err;
4337
4338 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4339 err:
4340 kfree_skb(skb2);
4341 return err;
4342
4343 return 0;
4344 }
4345
4346 static void nft_obj_destroy(struct nft_object *obj)
4347 {
4348 if (obj->type->destroy)
4349 obj->type->destroy(obj);
4350
4351 module_put(obj->type->owner);
4352 kfree(obj);
4353 }
4354
4355 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
4356 struct sk_buff *skb, const struct nlmsghdr *nlh,
4357 const struct nlattr * const nla[])
4358 {
4359 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4360 u8 genmask = nft_genmask_next(net);
4361 int family = nfmsg->nfgen_family;
4362 struct nft_af_info *afi;
4363 struct nft_table *table;
4364 struct nft_object *obj;
4365 struct nft_ctx ctx;
4366 u32 objtype;
4367
4368 if (!nla[NFTA_OBJ_TYPE] ||
4369 !nla[NFTA_OBJ_NAME])
4370 return -EINVAL;
4371
4372 afi = nf_tables_afinfo_lookup(net, family, true);
4373 if (IS_ERR(afi))
4374 return PTR_ERR(afi);
4375
4376 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4377 if (IS_ERR(table))
4378 return PTR_ERR(table);
4379
4380 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4381 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4382 if (IS_ERR(obj))
4383 return PTR_ERR(obj);
4384 if (obj->use > 0)
4385 return -EBUSY;
4386
4387 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4388
4389 return nft_delobj(&ctx, obj);
4390 }
4391
4392 int nft_obj_notify(struct net *net, struct nft_table *table,
4393 struct nft_object *obj, u32 portid, u32 seq, int event,
4394 int family, int report, gfp_t gfp)
4395 {
4396 struct sk_buff *skb;
4397 int err;
4398
4399 if (!report &&
4400 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4401 return 0;
4402
4403 err = -ENOBUFS;
4404 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
4405 if (skb == NULL)
4406 goto err;
4407
4408 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
4409 table, obj, false);
4410 if (err < 0) {
4411 kfree_skb(skb);
4412 goto err;
4413 }
4414
4415 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
4416 err:
4417 if (err < 0) {
4418 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
4419 }
4420 return err;
4421 }
4422 EXPORT_SYMBOL_GPL(nft_obj_notify);
4423
4424 static int nf_tables_obj_notify(const struct nft_ctx *ctx,
4425 struct nft_object *obj, int event)
4426 {
4427 return nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
4428 ctx->seq, event, ctx->afi->family, ctx->report,
4429 GFP_KERNEL);
4430 }
4431
4432 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
4433 u32 portid, u32 seq)
4434 {
4435 struct nlmsghdr *nlh;
4436 struct nfgenmsg *nfmsg;
4437 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
4438
4439 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
4440 if (nlh == NULL)
4441 goto nla_put_failure;
4442
4443 nfmsg = nlmsg_data(nlh);
4444 nfmsg->nfgen_family = AF_UNSPEC;
4445 nfmsg->version = NFNETLINK_V0;
4446 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4447
4448 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
4449 goto nla_put_failure;
4450
4451 nlmsg_end(skb, nlh);
4452 return 0;
4453
4454 nla_put_failure:
4455 nlmsg_trim(skb, nlh);
4456 return -EMSGSIZE;
4457 }
4458
4459 static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
4460 {
4461 struct nlmsghdr *nlh = nlmsg_hdr(skb);
4462 struct sk_buff *skb2;
4463 int err;
4464
4465 if (nlmsg_report(nlh) &&
4466 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4467 return 0;
4468
4469 err = -ENOBUFS;
4470 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4471 if (skb2 == NULL)
4472 goto err;
4473
4474 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4475 nlh->nlmsg_seq);
4476 if (err < 0) {
4477 kfree_skb(skb2);
4478 goto err;
4479 }
4480
4481 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
4482 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
4483 err:
4484 if (err < 0) {
4485 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4486 err);
4487 }
4488 return err;
4489 }
4490
4491 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
4492 struct sk_buff *skb, const struct nlmsghdr *nlh,
4493 const struct nlattr * const nla[])
4494 {
4495 struct sk_buff *skb2;
4496 int err;
4497
4498 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4499 if (skb2 == NULL)
4500 return -ENOMEM;
4501
4502 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4503 nlh->nlmsg_seq);
4504 if (err < 0)
4505 goto err;
4506
4507 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4508 err:
4509 kfree_skb(skb2);
4510 return err;
4511 }
4512
4513 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
4514 [NFT_MSG_NEWTABLE] = {
4515 .call_batch = nf_tables_newtable,
4516 .attr_count = NFTA_TABLE_MAX,
4517 .policy = nft_table_policy,
4518 },
4519 [NFT_MSG_GETTABLE] = {
4520 .call = nf_tables_gettable,
4521 .attr_count = NFTA_TABLE_MAX,
4522 .policy = nft_table_policy,
4523 },
4524 [NFT_MSG_DELTABLE] = {
4525 .call_batch = nf_tables_deltable,
4526 .attr_count = NFTA_TABLE_MAX,
4527 .policy = nft_table_policy,
4528 },
4529 [NFT_MSG_NEWCHAIN] = {
4530 .call_batch = nf_tables_newchain,
4531 .attr_count = NFTA_CHAIN_MAX,
4532 .policy = nft_chain_policy,
4533 },
4534 [NFT_MSG_GETCHAIN] = {
4535 .call = nf_tables_getchain,
4536 .attr_count = NFTA_CHAIN_MAX,
4537 .policy = nft_chain_policy,
4538 },
4539 [NFT_MSG_DELCHAIN] = {
4540 .call_batch = nf_tables_delchain,
4541 .attr_count = NFTA_CHAIN_MAX,
4542 .policy = nft_chain_policy,
4543 },
4544 [NFT_MSG_NEWRULE] = {
4545 .call_batch = nf_tables_newrule,
4546 .attr_count = NFTA_RULE_MAX,
4547 .policy = nft_rule_policy,
4548 },
4549 [NFT_MSG_GETRULE] = {
4550 .call = nf_tables_getrule,
4551 .attr_count = NFTA_RULE_MAX,
4552 .policy = nft_rule_policy,
4553 },
4554 [NFT_MSG_DELRULE] = {
4555 .call_batch = nf_tables_delrule,
4556 .attr_count = NFTA_RULE_MAX,
4557 .policy = nft_rule_policy,
4558 },
4559 [NFT_MSG_NEWSET] = {
4560 .call_batch = nf_tables_newset,
4561 .attr_count = NFTA_SET_MAX,
4562 .policy = nft_set_policy,
4563 },
4564 [NFT_MSG_GETSET] = {
4565 .call = nf_tables_getset,
4566 .attr_count = NFTA_SET_MAX,
4567 .policy = nft_set_policy,
4568 },
4569 [NFT_MSG_DELSET] = {
4570 .call_batch = nf_tables_delset,
4571 .attr_count = NFTA_SET_MAX,
4572 .policy = nft_set_policy,
4573 },
4574 [NFT_MSG_NEWSETELEM] = {
4575 .call_batch = nf_tables_newsetelem,
4576 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4577 .policy = nft_set_elem_list_policy,
4578 },
4579 [NFT_MSG_GETSETELEM] = {
4580 .call = nf_tables_getsetelem,
4581 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4582 .policy = nft_set_elem_list_policy,
4583 },
4584 [NFT_MSG_DELSETELEM] = {
4585 .call_batch = nf_tables_delsetelem,
4586 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4587 .policy = nft_set_elem_list_policy,
4588 },
4589 [NFT_MSG_GETGEN] = {
4590 .call = nf_tables_getgen,
4591 },
4592 [NFT_MSG_NEWOBJ] = {
4593 .call_batch = nf_tables_newobj,
4594 .attr_count = NFTA_OBJ_MAX,
4595 .policy = nft_obj_policy,
4596 },
4597 [NFT_MSG_GETOBJ] = {
4598 .call = nf_tables_getobj,
4599 .attr_count = NFTA_OBJ_MAX,
4600 .policy = nft_obj_policy,
4601 },
4602 [NFT_MSG_DELOBJ] = {
4603 .call_batch = nf_tables_delobj,
4604 .attr_count = NFTA_OBJ_MAX,
4605 .policy = nft_obj_policy,
4606 },
4607 [NFT_MSG_GETOBJ_RESET] = {
4608 .call = nf_tables_getobj,
4609 .attr_count = NFTA_OBJ_MAX,
4610 .policy = nft_obj_policy,
4611 },
4612 };
4613
4614 static void nft_chain_commit_update(struct nft_trans *trans)
4615 {
4616 struct nft_base_chain *basechain;
4617
4618 if (nft_trans_chain_name(trans)[0])
4619 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
4620
4621 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
4622 return;
4623
4624 basechain = nft_base_chain(trans->ctx.chain);
4625 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
4626
4627 switch (nft_trans_chain_policy(trans)) {
4628 case NF_DROP:
4629 case NF_ACCEPT:
4630 basechain->policy = nft_trans_chain_policy(trans);
4631 break;
4632 }
4633 }
4634
4635 static void nf_tables_commit_release(struct nft_trans *trans)
4636 {
4637 switch (trans->msg_type) {
4638 case NFT_MSG_DELTABLE:
4639 nf_tables_table_destroy(&trans->ctx);
4640 break;
4641 case NFT_MSG_DELCHAIN:
4642 nf_tables_chain_destroy(trans->ctx.chain);
4643 break;
4644 case NFT_MSG_DELRULE:
4645 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4646 break;
4647 case NFT_MSG_DELSET:
4648 nft_set_destroy(nft_trans_set(trans));
4649 break;
4650 case NFT_MSG_DELSETELEM:
4651 nft_set_elem_destroy(nft_trans_elem_set(trans),
4652 nft_trans_elem(trans).priv, true);
4653 break;
4654 case NFT_MSG_DELOBJ:
4655 nft_obj_destroy(nft_trans_obj(trans));
4656 break;
4657 }
4658 kfree(trans);
4659 }
4660
4661 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
4662 {
4663 struct nft_trans *trans, *next;
4664 struct nft_trans_elem *te;
4665
4666 /* Bump generation counter, invalidate any dump in progress */
4667 while (++net->nft.base_seq == 0);
4668
4669 /* A new generation has just started */
4670 net->nft.gencursor = nft_gencursor_next(net);
4671
4672 /* Make sure all packets have left the previous generation before
4673 * purging old rules.
4674 */
4675 synchronize_rcu();
4676
4677 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4678 switch (trans->msg_type) {
4679 case NFT_MSG_NEWTABLE:
4680 if (nft_trans_table_update(trans)) {
4681 if (!nft_trans_table_enable(trans)) {
4682 nf_tables_table_disable(net,
4683 trans->ctx.afi,
4684 trans->ctx.table);
4685 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4686 }
4687 } else {
4688 nft_clear(net, trans->ctx.table);
4689 }
4690 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
4691 nft_trans_destroy(trans);
4692 break;
4693 case NFT_MSG_DELTABLE:
4694 list_del_rcu(&trans->ctx.table->list);
4695 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
4696 break;
4697 case NFT_MSG_NEWCHAIN:
4698 if (nft_trans_chain_update(trans))
4699 nft_chain_commit_update(trans);
4700 else
4701 nft_clear(net, trans->ctx.chain);
4702
4703 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
4704 nft_trans_destroy(trans);
4705 break;
4706 case NFT_MSG_DELCHAIN:
4707 list_del_rcu(&trans->ctx.chain->list);
4708 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
4709 nf_tables_unregister_hooks(trans->ctx.net,
4710 trans->ctx.table,
4711 trans->ctx.chain,
4712 trans->ctx.afi->nops);
4713 break;
4714 case NFT_MSG_NEWRULE:
4715 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4716 nf_tables_rule_notify(&trans->ctx,
4717 nft_trans_rule(trans),
4718 NFT_MSG_NEWRULE);
4719 nft_trans_destroy(trans);
4720 break;
4721 case NFT_MSG_DELRULE:
4722 list_del_rcu(&nft_trans_rule(trans)->list);
4723 nf_tables_rule_notify(&trans->ctx,
4724 nft_trans_rule(trans),
4725 NFT_MSG_DELRULE);
4726 break;
4727 case NFT_MSG_NEWSET:
4728 nft_clear(net, nft_trans_set(trans));
4729 /* This avoids hitting -EBUSY when deleting the table
4730 * from the transaction.
4731 */
4732 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4733 !list_empty(&nft_trans_set(trans)->bindings))
4734 trans->ctx.table->use--;
4735
4736 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4737 NFT_MSG_NEWSET, GFP_KERNEL);
4738 nft_trans_destroy(trans);
4739 break;
4740 case NFT_MSG_DELSET:
4741 list_del_rcu(&nft_trans_set(trans)->list);
4742 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4743 NFT_MSG_DELSET, GFP_KERNEL);
4744 break;
4745 case NFT_MSG_NEWSETELEM:
4746 te = (struct nft_trans_elem *)trans->data;
4747
4748 te->set->ops->activate(net, te->set, &te->elem);
4749 nf_tables_setelem_notify(&trans->ctx, te->set,
4750 &te->elem,
4751 NFT_MSG_NEWSETELEM, 0);
4752 nft_trans_destroy(trans);
4753 break;
4754 case NFT_MSG_DELSETELEM:
4755 te = (struct nft_trans_elem *)trans->data;
4756
4757 nf_tables_setelem_notify(&trans->ctx, te->set,
4758 &te->elem,
4759 NFT_MSG_DELSETELEM, 0);
4760 te->set->ops->remove(te->set, &te->elem);
4761 atomic_dec(&te->set->nelems);
4762 te->set->ndeact--;
4763 break;
4764 case NFT_MSG_NEWOBJ:
4765 nft_clear(net, nft_trans_obj(trans));
4766 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4767 NFT_MSG_NEWOBJ);
4768 nft_trans_destroy(trans);
4769 break;
4770 case NFT_MSG_DELOBJ:
4771 list_del_rcu(&nft_trans_obj(trans)->list);
4772 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4773 NFT_MSG_DELOBJ);
4774 break;
4775 }
4776 }
4777
4778 synchronize_rcu();
4779
4780 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4781 list_del(&trans->list);
4782 nf_tables_commit_release(trans);
4783 }
4784
4785 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
4786
4787 return 0;
4788 }
4789
4790 static void nf_tables_abort_release(struct nft_trans *trans)
4791 {
4792 switch (trans->msg_type) {
4793 case NFT_MSG_NEWTABLE:
4794 nf_tables_table_destroy(&trans->ctx);
4795 break;
4796 case NFT_MSG_NEWCHAIN:
4797 nf_tables_chain_destroy(trans->ctx.chain);
4798 break;
4799 case NFT_MSG_NEWRULE:
4800 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4801 break;
4802 case NFT_MSG_NEWSET:
4803 nft_set_destroy(nft_trans_set(trans));
4804 break;
4805 case NFT_MSG_NEWSETELEM:
4806 nft_set_elem_destroy(nft_trans_elem_set(trans),
4807 nft_trans_elem(trans).priv, true);
4808 break;
4809 case NFT_MSG_NEWOBJ:
4810 nft_obj_destroy(nft_trans_obj(trans));
4811 break;
4812 }
4813 kfree(trans);
4814 }
4815
4816 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
4817 {
4818 struct nft_trans *trans, *next;
4819 struct nft_trans_elem *te;
4820
4821 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4822 list) {
4823 switch (trans->msg_type) {
4824 case NFT_MSG_NEWTABLE:
4825 if (nft_trans_table_update(trans)) {
4826 if (nft_trans_table_enable(trans)) {
4827 nf_tables_table_disable(net,
4828 trans->ctx.afi,
4829 trans->ctx.table);
4830 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4831 }
4832 nft_trans_destroy(trans);
4833 } else {
4834 list_del_rcu(&trans->ctx.table->list);
4835 }
4836 break;
4837 case NFT_MSG_DELTABLE:
4838 nft_clear(trans->ctx.net, trans->ctx.table);
4839 nft_trans_destroy(trans);
4840 break;
4841 case NFT_MSG_NEWCHAIN:
4842 if (nft_trans_chain_update(trans)) {
4843 free_percpu(nft_trans_chain_stats(trans));
4844
4845 nft_trans_destroy(trans);
4846 } else {
4847 trans->ctx.table->use--;
4848 list_del_rcu(&trans->ctx.chain->list);
4849 nf_tables_unregister_hooks(trans->ctx.net,
4850 trans->ctx.table,
4851 trans->ctx.chain,
4852 trans->ctx.afi->nops);
4853 }
4854 break;
4855 case NFT_MSG_DELCHAIN:
4856 trans->ctx.table->use++;
4857 nft_clear(trans->ctx.net, trans->ctx.chain);
4858 nft_trans_destroy(trans);
4859 break;
4860 case NFT_MSG_NEWRULE:
4861 trans->ctx.chain->use--;
4862 list_del_rcu(&nft_trans_rule(trans)->list);
4863 break;
4864 case NFT_MSG_DELRULE:
4865 trans->ctx.chain->use++;
4866 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4867 nft_trans_destroy(trans);
4868 break;
4869 case NFT_MSG_NEWSET:
4870 trans->ctx.table->use--;
4871 list_del_rcu(&nft_trans_set(trans)->list);
4872 break;
4873 case NFT_MSG_DELSET:
4874 trans->ctx.table->use++;
4875 nft_clear(trans->ctx.net, nft_trans_set(trans));
4876 nft_trans_destroy(trans);
4877 break;
4878 case NFT_MSG_NEWSETELEM:
4879 te = (struct nft_trans_elem *)trans->data;
4880
4881 te->set->ops->remove(te->set, &te->elem);
4882 atomic_dec(&te->set->nelems);
4883 break;
4884 case NFT_MSG_DELSETELEM:
4885 te = (struct nft_trans_elem *)trans->data;
4886
4887 te->set->ops->activate(net, te->set, &te->elem);
4888 te->set->ndeact--;
4889
4890 nft_trans_destroy(trans);
4891 break;
4892 case NFT_MSG_NEWOBJ:
4893 trans->ctx.table->use--;
4894 list_del_rcu(&nft_trans_obj(trans)->list);
4895 break;
4896 case NFT_MSG_DELOBJ:
4897 trans->ctx.table->use++;
4898 nft_clear(trans->ctx.net, nft_trans_obj(trans));
4899 nft_trans_destroy(trans);
4900 break;
4901 }
4902 }
4903
4904 synchronize_rcu();
4905
4906 list_for_each_entry_safe_reverse(trans, next,
4907 &net->nft.commit_list, list) {
4908 list_del(&trans->list);
4909 nf_tables_abort_release(trans);
4910 }
4911
4912 return 0;
4913 }
4914
4915 static const struct nfnetlink_subsystem nf_tables_subsys = {
4916 .name = "nf_tables",
4917 .subsys_id = NFNL_SUBSYS_NFTABLES,
4918 .cb_count = NFT_MSG_MAX,
4919 .cb = nf_tables_cb,
4920 .commit = nf_tables_commit,
4921 .abort = nf_tables_abort,
4922 };
4923
4924 int nft_chain_validate_dependency(const struct nft_chain *chain,
4925 enum nft_chain_type type)
4926 {
4927 const struct nft_base_chain *basechain;
4928
4929 if (chain->flags & NFT_BASE_CHAIN) {
4930 basechain = nft_base_chain(chain);
4931 if (basechain->type->type != type)
4932 return -EOPNOTSUPP;
4933 }
4934 return 0;
4935 }
4936 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
4937
4938 int nft_chain_validate_hooks(const struct nft_chain *chain,
4939 unsigned int hook_flags)
4940 {
4941 struct nft_base_chain *basechain;
4942
4943 if (chain->flags & NFT_BASE_CHAIN) {
4944 basechain = nft_base_chain(chain);
4945
4946 if ((1 << basechain->ops[0].hooknum) & hook_flags)
4947 return 0;
4948
4949 return -EOPNOTSUPP;
4950 }
4951
4952 return 0;
4953 }
4954 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
4955
4956 /*
4957 * Loop detection - walk through the ruleset beginning at the destination chain
4958 * of a new jump until either the source chain is reached (loop) or all
4959 * reachable chains have been traversed.
4960 *
4961 * The loop check is performed whenever a new jump verdict is added to an
4962 * expression or verdict map or a verdict map is bound to a new chain.
4963 */
4964
4965 static int nf_tables_check_loops(const struct nft_ctx *ctx,
4966 const struct nft_chain *chain);
4967
4968 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
4969 const struct nft_set *set,
4970 const struct nft_set_iter *iter,
4971 const struct nft_set_elem *elem)
4972 {
4973 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4974 const struct nft_data *data;
4975
4976 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4977 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
4978 return 0;
4979
4980 data = nft_set_ext_data(ext);
4981 switch (data->verdict.code) {
4982 case NFT_JUMP:
4983 case NFT_GOTO:
4984 return nf_tables_check_loops(ctx, data->verdict.chain);
4985 default:
4986 return 0;
4987 }
4988 }
4989
4990 static int nf_tables_check_loops(const struct nft_ctx *ctx,
4991 const struct nft_chain *chain)
4992 {
4993 const struct nft_rule *rule;
4994 const struct nft_expr *expr, *last;
4995 const struct nft_set *set;
4996 struct nft_set_binding *binding;
4997 struct nft_set_iter iter;
4998
4999 if (ctx->chain == chain)
5000 return -ELOOP;
5001
5002 list_for_each_entry(rule, &chain->rules, list) {
5003 nft_rule_for_each_expr(expr, last, rule) {
5004 const struct nft_data *data = NULL;
5005 int err;
5006
5007 if (!expr->ops->validate)
5008 continue;
5009
5010 err = expr->ops->validate(ctx, expr, &data);
5011 if (err < 0)
5012 return err;
5013
5014 if (data == NULL)
5015 continue;
5016
5017 switch (data->verdict.code) {
5018 case NFT_JUMP:
5019 case NFT_GOTO:
5020 err = nf_tables_check_loops(ctx,
5021 data->verdict.chain);
5022 if (err < 0)
5023 return err;
5024 default:
5025 break;
5026 }
5027 }
5028 }
5029
5030 list_for_each_entry(set, &ctx->table->sets, list) {
5031 if (!nft_is_active_next(ctx->net, set))
5032 continue;
5033 if (!(set->flags & NFT_SET_MAP) ||
5034 set->dtype != NFT_DATA_VERDICT)
5035 continue;
5036
5037 list_for_each_entry(binding, &set->bindings, list) {
5038 if (!(binding->flags & NFT_SET_MAP) ||
5039 binding->chain != chain)
5040 continue;
5041
5042 iter.genmask = nft_genmask_next(ctx->net);
5043 iter.skip = 0;
5044 iter.count = 0;
5045 iter.err = 0;
5046 iter.fn = nf_tables_loop_check_setelem;
5047
5048 set->ops->walk(ctx, set, &iter);
5049 if (iter.err < 0)
5050 return iter.err;
5051 }
5052 }
5053
5054 return 0;
5055 }
5056
5057 /**
5058 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
5059 *
5060 * @attr: netlink attribute to fetch value from
5061 * @max: maximum value to be stored in dest
5062 * @dest: pointer to the variable
5063 *
5064 * Parse, check and store a given u32 netlink attribute into variable.
5065 * This function returns -ERANGE if the value goes over maximum value.
5066 * Otherwise a 0 is returned and the attribute value is stored in the
5067 * destination variable.
5068 */
5069 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
5070 {
5071 u32 val;
5072
5073 val = ntohl(nla_get_be32(attr));
5074 if (val > max)
5075 return -ERANGE;
5076
5077 *dest = val;
5078 return 0;
5079 }
5080 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
5081
5082 /**
5083 * nft_parse_register - parse a register value from a netlink attribute
5084 *
5085 * @attr: netlink attribute
5086 *
5087 * Parse and translate a register value from a netlink attribute.
5088 * Registers used to be 128 bit wide, these register numbers will be
5089 * mapped to the corresponding 32 bit register numbers.
5090 */
5091 unsigned int nft_parse_register(const struct nlattr *attr)
5092 {
5093 unsigned int reg;
5094
5095 reg = ntohl(nla_get_be32(attr));
5096 switch (reg) {
5097 case NFT_REG_VERDICT...NFT_REG_4:
5098 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
5099 default:
5100 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
5101 }
5102 }
5103 EXPORT_SYMBOL_GPL(nft_parse_register);
5104
5105 /**
5106 * nft_dump_register - dump a register value to a netlink attribute
5107 *
5108 * @skb: socket buffer
5109 * @attr: attribute number
5110 * @reg: register number
5111 *
5112 * Construct a netlink attribute containing the register number. For
5113 * compatibility reasons, register numbers being a multiple of 4 are
5114 * translated to the corresponding 128 bit register numbers.
5115 */
5116 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
5117 {
5118 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
5119 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
5120 else
5121 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
5122
5123 return nla_put_be32(skb, attr, htonl(reg));
5124 }
5125 EXPORT_SYMBOL_GPL(nft_dump_register);
5126
5127 /**
5128 * nft_validate_register_load - validate a load from a register
5129 *
5130 * @reg: the register number
5131 * @len: the length of the data
5132 *
5133 * Validate that the input register is one of the general purpose
5134 * registers and that the length of the load is within the bounds.
5135 */
5136 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
5137 {
5138 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5139 return -EINVAL;
5140 if (len == 0)
5141 return -EINVAL;
5142 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
5143 return -ERANGE;
5144
5145 return 0;
5146 }
5147 EXPORT_SYMBOL_GPL(nft_validate_register_load);
5148
5149 /**
5150 * nft_validate_register_store - validate an expressions' register store
5151 *
5152 * @ctx: context of the expression performing the load
5153 * @reg: the destination register number
5154 * @data: the data to load
5155 * @type: the data type
5156 * @len: the length of the data
5157 *
5158 * Validate that a data load uses the appropriate data type for
5159 * the destination register and the length is within the bounds.
5160 * A value of NULL for the data means that its runtime gathered
5161 * data.
5162 */
5163 int nft_validate_register_store(const struct nft_ctx *ctx,
5164 enum nft_registers reg,
5165 const struct nft_data *data,
5166 enum nft_data_types type, unsigned int len)
5167 {
5168 int err;
5169
5170 switch (reg) {
5171 case NFT_REG_VERDICT:
5172 if (type != NFT_DATA_VERDICT)
5173 return -EINVAL;
5174
5175 if (data != NULL &&
5176 (data->verdict.code == NFT_GOTO ||
5177 data->verdict.code == NFT_JUMP)) {
5178 err = nf_tables_check_loops(ctx, data->verdict.chain);
5179 if (err < 0)
5180 return err;
5181
5182 if (ctx->chain->level + 1 >
5183 data->verdict.chain->level) {
5184 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
5185 return -EMLINK;
5186 data->verdict.chain->level = ctx->chain->level + 1;
5187 }
5188 }
5189
5190 return 0;
5191 default:
5192 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5193 return -EINVAL;
5194 if (len == 0)
5195 return -EINVAL;
5196 if (reg * NFT_REG32_SIZE + len >
5197 FIELD_SIZEOF(struct nft_regs, data))
5198 return -ERANGE;
5199
5200 if (data != NULL && type != NFT_DATA_VALUE)
5201 return -EINVAL;
5202 return 0;
5203 }
5204 }
5205 EXPORT_SYMBOL_GPL(nft_validate_register_store);
5206
5207 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
5208 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
5209 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
5210 .len = NFT_CHAIN_MAXNAMELEN - 1 },
5211 };
5212
5213 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
5214 struct nft_data_desc *desc, const struct nlattr *nla)
5215 {
5216 u8 genmask = nft_genmask_next(ctx->net);
5217 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
5218 struct nft_chain *chain;
5219 int err;
5220
5221 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
5222 if (err < 0)
5223 return err;
5224
5225 if (!tb[NFTA_VERDICT_CODE])
5226 return -EINVAL;
5227 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
5228
5229 switch (data->verdict.code) {
5230 default:
5231 switch (data->verdict.code & NF_VERDICT_MASK) {
5232 case NF_ACCEPT:
5233 case NF_DROP:
5234 case NF_QUEUE:
5235 break;
5236 default:
5237 return -EINVAL;
5238 }
5239 /* fall through */
5240 case NFT_CONTINUE:
5241 case NFT_BREAK:
5242 case NFT_RETURN:
5243 break;
5244 case NFT_JUMP:
5245 case NFT_GOTO:
5246 if (!tb[NFTA_VERDICT_CHAIN])
5247 return -EINVAL;
5248 chain = nf_tables_chain_lookup(ctx->table,
5249 tb[NFTA_VERDICT_CHAIN], genmask);
5250 if (IS_ERR(chain))
5251 return PTR_ERR(chain);
5252 if (chain->flags & NFT_BASE_CHAIN)
5253 return -EOPNOTSUPP;
5254
5255 chain->use++;
5256 data->verdict.chain = chain;
5257 break;
5258 }
5259
5260 desc->len = sizeof(data->verdict);
5261 desc->type = NFT_DATA_VERDICT;
5262 return 0;
5263 }
5264
5265 static void nft_verdict_uninit(const struct nft_data *data)
5266 {
5267 switch (data->verdict.code) {
5268 case NFT_JUMP:
5269 case NFT_GOTO:
5270 data->verdict.chain->use--;
5271 break;
5272 }
5273 }
5274
5275 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
5276 {
5277 struct nlattr *nest;
5278
5279 nest = nla_nest_start(skb, type);
5280 if (!nest)
5281 goto nla_put_failure;
5282
5283 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
5284 goto nla_put_failure;
5285
5286 switch (v->code) {
5287 case NFT_JUMP:
5288 case NFT_GOTO:
5289 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
5290 v->chain->name))
5291 goto nla_put_failure;
5292 }
5293 nla_nest_end(skb, nest);
5294 return 0;
5295
5296 nla_put_failure:
5297 return -1;
5298 }
5299
5300 static int nft_value_init(const struct nft_ctx *ctx,
5301 struct nft_data *data, unsigned int size,
5302 struct nft_data_desc *desc, const struct nlattr *nla)
5303 {
5304 unsigned int len;
5305
5306 len = nla_len(nla);
5307 if (len == 0)
5308 return -EINVAL;
5309 if (len > size)
5310 return -EOVERFLOW;
5311
5312 nla_memcpy(data->data, nla, len);
5313 desc->type = NFT_DATA_VALUE;
5314 desc->len = len;
5315 return 0;
5316 }
5317
5318 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
5319 unsigned int len)
5320 {
5321 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
5322 }
5323
5324 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
5325 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
5326 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
5327 };
5328
5329 /**
5330 * nft_data_init - parse nf_tables data netlink attributes
5331 *
5332 * @ctx: context of the expression using the data
5333 * @data: destination struct nft_data
5334 * @size: maximum data length
5335 * @desc: data description
5336 * @nla: netlink attribute containing data
5337 *
5338 * Parse the netlink data attributes and initialize a struct nft_data.
5339 * The type and length of data are returned in the data description.
5340 *
5341 * The caller can indicate that it only wants to accept data of type
5342 * NFT_DATA_VALUE by passing NULL for the ctx argument.
5343 */
5344 int nft_data_init(const struct nft_ctx *ctx,
5345 struct nft_data *data, unsigned int size,
5346 struct nft_data_desc *desc, const struct nlattr *nla)
5347 {
5348 struct nlattr *tb[NFTA_DATA_MAX + 1];
5349 int err;
5350
5351 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
5352 if (err < 0)
5353 return err;
5354
5355 if (tb[NFTA_DATA_VALUE])
5356 return nft_value_init(ctx, data, size, desc,
5357 tb[NFTA_DATA_VALUE]);
5358 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
5359 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
5360 return -EINVAL;
5361 }
5362 EXPORT_SYMBOL_GPL(nft_data_init);
5363
5364 /**
5365 * nft_data_uninit - release a nft_data item
5366 *
5367 * @data: struct nft_data to release
5368 * @type: type of data
5369 *
5370 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5371 * all others need to be released by calling this function.
5372 */
5373 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
5374 {
5375 if (type < NFT_DATA_VERDICT)
5376 return;
5377 switch (type) {
5378 case NFT_DATA_VERDICT:
5379 return nft_verdict_uninit(data);
5380 default:
5381 WARN_ON(1);
5382 }
5383 }
5384 EXPORT_SYMBOL_GPL(nft_data_uninit);
5385
5386 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
5387 enum nft_data_types type, unsigned int len)
5388 {
5389 struct nlattr *nest;
5390 int err;
5391
5392 nest = nla_nest_start(skb, attr);
5393 if (nest == NULL)
5394 return -1;
5395
5396 switch (type) {
5397 case NFT_DATA_VALUE:
5398 err = nft_value_dump(skb, data, len);
5399 break;
5400 case NFT_DATA_VERDICT:
5401 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
5402 break;
5403 default:
5404 err = -EINVAL;
5405 WARN_ON(1);
5406 }
5407
5408 nla_nest_end(skb, nest);
5409 return err;
5410 }
5411 EXPORT_SYMBOL_GPL(nft_data_dump);
5412
5413 static int __net_init nf_tables_init_net(struct net *net)
5414 {
5415 INIT_LIST_HEAD(&net->nft.af_info);
5416 INIT_LIST_HEAD(&net->nft.commit_list);
5417 net->nft.base_seq = 1;
5418 return 0;
5419 }
5420
5421 int __nft_release_basechain(struct nft_ctx *ctx)
5422 {
5423 struct nft_rule *rule, *nr;
5424
5425 BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
5426
5427 nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
5428 ctx->afi->nops);
5429 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
5430 list_del(&rule->list);
5431 ctx->chain->use--;
5432 nf_tables_rule_destroy(ctx, rule);
5433 }
5434 list_del(&ctx->chain->list);
5435 ctx->table->use--;
5436 nf_tables_chain_destroy(ctx->chain);
5437
5438 return 0;
5439 }
5440 EXPORT_SYMBOL_GPL(__nft_release_basechain);
5441
5442 /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
5443 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
5444 {
5445 struct nft_table *table, *nt;
5446 struct nft_chain *chain, *nc;
5447 struct nft_object *obj, *ne;
5448 struct nft_rule *rule, *nr;
5449 struct nft_set *set, *ns;
5450 struct nft_ctx ctx = {
5451 .net = net,
5452 .afi = afi,
5453 };
5454
5455 list_for_each_entry_safe(table, nt, &afi->tables, list) {
5456 list_for_each_entry(chain, &table->chains, list)
5457 nf_tables_unregister_hooks(net, table, chain,
5458 afi->nops);
5459 /* No packets are walking on these chains anymore. */
5460 ctx.table = table;
5461 list_for_each_entry(chain, &table->chains, list) {
5462 ctx.chain = chain;
5463 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
5464 list_del(&rule->list);
5465 chain->use--;
5466 nf_tables_rule_destroy(&ctx, rule);
5467 }
5468 }
5469 list_for_each_entry_safe(set, ns, &table->sets, list) {
5470 list_del(&set->list);
5471 table->use--;
5472 nft_set_destroy(set);
5473 }
5474 list_for_each_entry_safe(obj, ne, &table->objects, list) {
5475 list_del(&obj->list);
5476 table->use--;
5477 nft_obj_destroy(obj);
5478 }
5479 list_for_each_entry_safe(chain, nc, &table->chains, list) {
5480 list_del(&chain->list);
5481 table->use--;
5482 nf_tables_chain_destroy(chain);
5483 }
5484 list_del(&table->list);
5485 nf_tables_table_destroy(&ctx);
5486 }
5487 }
5488
5489 static struct pernet_operations nf_tables_net_ops = {
5490 .init = nf_tables_init_net,
5491 };
5492
5493 static int __init nf_tables_module_init(void)
5494 {
5495 int err;
5496
5497 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
5498 GFP_KERNEL);
5499 if (info == NULL) {
5500 err = -ENOMEM;
5501 goto err1;
5502 }
5503
5504 err = nf_tables_core_module_init();
5505 if (err < 0)
5506 goto err2;
5507
5508 err = nfnetlink_subsys_register(&nf_tables_subsys);
5509 if (err < 0)
5510 goto err3;
5511
5512 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
5513 return register_pernet_subsys(&nf_tables_net_ops);
5514 err3:
5515 nf_tables_core_module_exit();
5516 err2:
5517 kfree(info);
5518 err1:
5519 return err;
5520 }
5521
5522 static void __exit nf_tables_module_exit(void)
5523 {
5524 unregister_pernet_subsys(&nf_tables_net_ops);
5525 nfnetlink_subsys_unregister(&nf_tables_subsys);
5526 rcu_barrier();
5527 nf_tables_core_module_exit();
5528 kfree(info);
5529 }
5530
5531 module_init(nf_tables_module_init);
5532 module_exit(nf_tables_module_exit);
5533
5534 MODULE_LICENSE("GPL");
5535 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
5536 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
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