]> git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - net/netfilter/nf_tables_api.c
projects / mirror_ubuntu-focal-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Input: wm97xx: add new AC97 bus support
[mirror_ubuntu-focal-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/vmalloc.h>
17 #include <linux/netfilter.h>
18 #include <linux/netfilter/nfnetlink.h>
19 #include <linux/netfilter/nf_tables.h>
20 #include <net/netfilter/nf_tables_core.h>
21 #include <net/netfilter/nf_tables.h>
22 #include <net/net_namespace.h>
23 #include <net/sock.h>
24
25 static LIST_HEAD(nf_tables_expressions);
26 static LIST_HEAD(nf_tables_objects);
27
28 /**
29 * nft_register_afinfo - register nf_tables address family info
30 *
31 * @afi: address family info to register
32 *
33 * Register the address family for use with nf_tables. Returns zero on
34 * success or a negative errno code otherwise.
35 */
36 int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
37 {
38 INIT_LIST_HEAD(&afi->tables);
39 nfnl_lock(NFNL_SUBSYS_NFTABLES);
40 list_add_tail_rcu(&afi->list, &net->nft.af_info);
41 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
42 return 0;
43 }
44 EXPORT_SYMBOL_GPL(nft_register_afinfo);
45
46 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi);
47
48 /**
49 * nft_unregister_afinfo - unregister nf_tables address family info
50 *
51 * @afi: address family info to unregister
52 *
53 * Unregister the address family for use with nf_tables.
54 */
55 void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi)
56 {
57 nfnl_lock(NFNL_SUBSYS_NFTABLES);
58 __nft_release_afinfo(net, afi);
59 list_del_rcu(&afi->list);
60 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
61 }
62 EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
63
64 static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
65 {
66 struct nft_af_info *afi;
67
68 list_for_each_entry(afi, &net->nft.af_info, list) {
69 if (afi->family == family)
70 return afi;
71 }
72 return NULL;
73 }
74
75 static struct nft_af_info *
76 nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
77 {
78 struct nft_af_info *afi;
79
80 afi = nft_afinfo_lookup(net, family);
81 if (afi != NULL)
82 return afi;
83 #ifdef CONFIG_MODULES
84 if (autoload) {
85 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
86 request_module("nft-afinfo-%u", family);
87 nfnl_lock(NFNL_SUBSYS_NFTABLES);
88 afi = nft_afinfo_lookup(net, family);
89 if (afi != NULL)
90 return ERR_PTR(-EAGAIN);
91 }
92 #endif
93 return ERR_PTR(-EAFNOSUPPORT);
94 }
95
96 static void nft_ctx_init(struct nft_ctx *ctx,
97 struct net *net,
98 const struct sk_buff *skb,
99 const struct nlmsghdr *nlh,
100 struct nft_af_info *afi,
101 struct nft_table *table,
102 struct nft_chain *chain,
103 const struct nlattr * const *nla)
104 {
105 ctx->net = net;
106 ctx->afi = afi;
107 ctx->table = table;
108 ctx->chain = chain;
109 ctx->nla = nla;
110 ctx->portid = NETLINK_CB(skb).portid;
111 ctx->report = nlmsg_report(nlh);
112 ctx->seq = nlh->nlmsg_seq;
113 }
114
115 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
116 int msg_type, u32 size, gfp_t gfp)
117 {
118 struct nft_trans *trans;
119
120 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
121 if (trans == NULL)
122 return NULL;
123
124 trans->msg_type = msg_type;
125 trans->ctx = *ctx;
126
127 return trans;
128 }
129
130 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
131 int msg_type, u32 size)
132 {
133 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
134 }
135
136 static void nft_trans_destroy(struct nft_trans *trans)
137 {
138 list_del(&trans->list);
139 kfree(trans);
140 }
141
142 static int nf_tables_register_hooks(struct net *net,
143 const struct nft_table *table,
144 struct nft_chain *chain,
145 unsigned int hook_nops)
146 {
147 if (table->flags & NFT_TABLE_F_DORMANT ||
148 !nft_is_base_chain(chain))
149 return 0;
150
151 return nf_register_net_hooks(net, nft_base_chain(chain)->ops,
152 hook_nops);
153 }
154
155 static void nf_tables_unregister_hooks(struct net *net,
156 const struct nft_table *table,
157 struct nft_chain *chain,
158 unsigned int hook_nops)
159 {
160 if (table->flags & NFT_TABLE_F_DORMANT ||
161 !nft_is_base_chain(chain))
162 return;
163
164 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops, hook_nops);
165 }
166
167 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
168 {
169 struct nft_trans *trans;
170
171 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
172 if (trans == NULL)
173 return -ENOMEM;
174
175 if (msg_type == NFT_MSG_NEWTABLE)
176 nft_activate_next(ctx->net, ctx->table);
177
178 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
179 return 0;
180 }
181
182 static int nft_deltable(struct nft_ctx *ctx)
183 {
184 int err;
185
186 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
187 if (err < 0)
188 return err;
189
190 nft_deactivate_next(ctx->net, ctx->table);
191 return err;
192 }
193
194 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
195 {
196 struct nft_trans *trans;
197
198 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
199 if (trans == NULL)
200 return -ENOMEM;
201
202 if (msg_type == NFT_MSG_NEWCHAIN)
203 nft_activate_next(ctx->net, ctx->chain);
204
205 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
206 return 0;
207 }
208
209 static int nft_delchain(struct nft_ctx *ctx)
210 {
211 int err;
212
213 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
214 if (err < 0)
215 return err;
216
217 ctx->table->use--;
218 nft_deactivate_next(ctx->net, ctx->chain);
219
220 return err;
221 }
222
223 static int
224 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
225 {
226 /* You cannot delete the same rule twice */
227 if (nft_is_active_next(ctx->net, rule)) {
228 nft_deactivate_next(ctx->net, rule);
229 ctx->chain->use--;
230 return 0;
231 }
232 return -ENOENT;
233 }
234
235 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
236 struct nft_rule *rule)
237 {
238 struct nft_trans *trans;
239
240 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
241 if (trans == NULL)
242 return NULL;
243
244 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
245 nft_trans_rule_id(trans) =
246 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
247 }
248 nft_trans_rule(trans) = rule;
249 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
250
251 return trans;
252 }
253
254 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
255 {
256 struct nft_trans *trans;
257 int err;
258
259 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
260 if (trans == NULL)
261 return -ENOMEM;
262
263 err = nf_tables_delrule_deactivate(ctx, rule);
264 if (err < 0) {
265 nft_trans_destroy(trans);
266 return err;
267 }
268
269 return 0;
270 }
271
272 static int nft_delrule_by_chain(struct nft_ctx *ctx)
273 {
274 struct nft_rule *rule;
275 int err;
276
277 list_for_each_entry(rule, &ctx->chain->rules, list) {
278 err = nft_delrule(ctx, rule);
279 if (err < 0)
280 return err;
281 }
282 return 0;
283 }
284
285 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
286 struct nft_set *set)
287 {
288 struct nft_trans *trans;
289
290 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
291 if (trans == NULL)
292 return -ENOMEM;
293
294 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
295 nft_trans_set_id(trans) =
296 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
297 nft_activate_next(ctx->net, set);
298 }
299 nft_trans_set(trans) = set;
300 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
301
302 return 0;
303 }
304
305 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
306 {
307 int err;
308
309 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
310 if (err < 0)
311 return err;
312
313 nft_deactivate_next(ctx->net, set);
314 ctx->table->use--;
315
316 return err;
317 }
318
319 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
320 struct nft_object *obj)
321 {
322 struct nft_trans *trans;
323
324 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
325 if (trans == NULL)
326 return -ENOMEM;
327
328 if (msg_type == NFT_MSG_NEWOBJ)
329 nft_activate_next(ctx->net, obj);
330
331 nft_trans_obj(trans) = obj;
332 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
333
334 return 0;
335 }
336
337 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
338 {
339 int err;
340
341 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
342 if (err < 0)
343 return err;
344
345 nft_deactivate_next(ctx->net, obj);
346 ctx->table->use--;
347
348 return err;
349 }
350
351 /*
352 * Tables
353 */
354
355 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
356 const struct nlattr *nla,
357 u8 genmask)
358 {
359 struct nft_table *table;
360
361 list_for_each_entry(table, &afi->tables, list) {
362 if (!nla_strcmp(nla, table->name) &&
363 nft_active_genmask(table, genmask))
364 return table;
365 }
366 return NULL;
367 }
368
369 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
370 const struct nlattr *nla,
371 u8 genmask)
372 {
373 struct nft_table *table;
374
375 if (nla == NULL)
376 return ERR_PTR(-EINVAL);
377
378 table = nft_table_lookup(afi, nla, genmask);
379 if (table != NULL)
380 return table;
381
382 return ERR_PTR(-ENOENT);
383 }
384
385 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
386 {
387 return ++table->hgenerator;
388 }
389
390 static const struct nf_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
391
392 static const struct nf_chain_type *
393 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
394 {
395 int i;
396
397 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
398 if (chain_type[family][i] != NULL &&
399 !nla_strcmp(nla, chain_type[family][i]->name))
400 return chain_type[family][i];
401 }
402 return NULL;
403 }
404
405 static const struct nf_chain_type *
406 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
407 const struct nlattr *nla,
408 bool autoload)
409 {
410 const struct nf_chain_type *type;
411
412 type = __nf_tables_chain_type_lookup(afi->family, nla);
413 if (type != NULL)
414 return type;
415 #ifdef CONFIG_MODULES
416 if (autoload) {
417 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
418 request_module("nft-chain-%u-%.*s", afi->family,
419 nla_len(nla), (const char *)nla_data(nla));
420 nfnl_lock(NFNL_SUBSYS_NFTABLES);
421 type = __nf_tables_chain_type_lookup(afi->family, nla);
422 if (type != NULL)
423 return ERR_PTR(-EAGAIN);
424 }
425 #endif
426 return ERR_PTR(-ENOENT);
427 }
428
429 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
430 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
431 .len = NFT_TABLE_MAXNAMELEN - 1 },
432 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
433 };
434
435 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
436 u32 portid, u32 seq, int event, u32 flags,
437 int family, const struct nft_table *table)
438 {
439 struct nlmsghdr *nlh;
440 struct nfgenmsg *nfmsg;
441
442 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
443 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
444 if (nlh == NULL)
445 goto nla_put_failure;
446
447 nfmsg = nlmsg_data(nlh);
448 nfmsg->nfgen_family = family;
449 nfmsg->version = NFNETLINK_V0;
450 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
451
452 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
453 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
454 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
455 goto nla_put_failure;
456
457 nlmsg_end(skb, nlh);
458 return 0;
459
460 nla_put_failure:
461 nlmsg_trim(skb, nlh);
462 return -1;
463 }
464
465 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
466 {
467 struct sk_buff *skb;
468 int err;
469
470 if (!ctx->report &&
471 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
472 return;
473
474 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
475 if (skb == NULL)
476 goto err;
477
478 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
479 event, 0, ctx->afi->family, ctx->table);
480 if (err < 0) {
481 kfree_skb(skb);
482 goto err;
483 }
484
485 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
486 ctx->report, GFP_KERNEL);
487 return;
488 err:
489 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
490 }
491
492 static int nf_tables_dump_tables(struct sk_buff *skb,
493 struct netlink_callback *cb)
494 {
495 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
496 const struct nft_af_info *afi;
497 const struct nft_table *table;
498 unsigned int idx = 0, s_idx = cb->args[0];
499 struct net *net = sock_net(skb->sk);
500 int family = nfmsg->nfgen_family;
501
502 rcu_read_lock();
503 cb->seq = net->nft.base_seq;
504
505 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
506 if (family != NFPROTO_UNSPEC && family != afi->family)
507 continue;
508
509 list_for_each_entry_rcu(table, &afi->tables, list) {
510 if (idx < s_idx)
511 goto cont;
512 if (idx > s_idx)
513 memset(&cb->args[1], 0,
514 sizeof(cb->args) - sizeof(cb->args[0]));
515 if (!nft_is_active(net, table))
516 continue;
517 if (nf_tables_fill_table_info(skb, net,
518 NETLINK_CB(cb->skb).portid,
519 cb->nlh->nlmsg_seq,
520 NFT_MSG_NEWTABLE,
521 NLM_F_MULTI,
522 afi->family, table) < 0)
523 goto done;
524
525 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
526 cont:
527 idx++;
528 }
529 }
530 done:
531 rcu_read_unlock();
532 cb->args[0] = idx;
533 return skb->len;
534 }
535
536 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
537 struct sk_buff *skb, const struct nlmsghdr *nlh,
538 const struct nlattr * const nla[],
539 struct netlink_ext_ack *extack)
540 {
541 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
542 u8 genmask = nft_genmask_cur(net);
543 const struct nft_af_info *afi;
544 const struct nft_table *table;
545 struct sk_buff *skb2;
546 int family = nfmsg->nfgen_family;
547 int err;
548
549 if (nlh->nlmsg_flags & NLM_F_DUMP) {
550 struct netlink_dump_control c = {
551 .dump = nf_tables_dump_tables,
552 };
553 return netlink_dump_start(nlsk, skb, nlh, &c);
554 }
555
556 afi = nf_tables_afinfo_lookup(net, family, false);
557 if (IS_ERR(afi))
558 return PTR_ERR(afi);
559
560 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
561 if (IS_ERR(table))
562 return PTR_ERR(table);
563
564 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
565 if (!skb2)
566 return -ENOMEM;
567
568 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
569 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
570 family, table);
571 if (err < 0)
572 goto err;
573
574 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
575
576 err:
577 kfree_skb(skb2);
578 return err;
579 }
580
581 static void _nf_tables_table_disable(struct net *net,
582 const struct nft_af_info *afi,
583 struct nft_table *table,
584 u32 cnt)
585 {
586 struct nft_chain *chain;
587 u32 i = 0;
588
589 list_for_each_entry(chain, &table->chains, list) {
590 if (!nft_is_active_next(net, chain))
591 continue;
592 if (!nft_is_base_chain(chain))
593 continue;
594
595 if (cnt && i++ == cnt)
596 break;
597
598 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
599 afi->nops);
600 }
601 }
602
603 static int nf_tables_table_enable(struct net *net,
604 const struct nft_af_info *afi,
605 struct nft_table *table)
606 {
607 struct nft_chain *chain;
608 int err, i = 0;
609
610 list_for_each_entry(chain, &table->chains, list) {
611 if (!nft_is_active_next(net, chain))
612 continue;
613 if (!nft_is_base_chain(chain))
614 continue;
615
616 err = nf_register_net_hooks(net, nft_base_chain(chain)->ops,
617 afi->nops);
618 if (err < 0)
619 goto err;
620
621 i++;
622 }
623 return 0;
624 err:
625 if (i)
626 _nf_tables_table_disable(net, afi, table, i);
627 return err;
628 }
629
630 static void nf_tables_table_disable(struct net *net,
631 const struct nft_af_info *afi,
632 struct nft_table *table)
633 {
634 _nf_tables_table_disable(net, afi, table, 0);
635 }
636
637 static int nf_tables_updtable(struct nft_ctx *ctx)
638 {
639 struct nft_trans *trans;
640 u32 flags;
641 int ret = 0;
642
643 if (!ctx->nla[NFTA_TABLE_FLAGS])
644 return 0;
645
646 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
647 if (flags & ~NFT_TABLE_F_DORMANT)
648 return -EINVAL;
649
650 if (flags == ctx->table->flags)
651 return 0;
652
653 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
654 sizeof(struct nft_trans_table));
655 if (trans == NULL)
656 return -ENOMEM;
657
658 if ((flags & NFT_TABLE_F_DORMANT) &&
659 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
660 nft_trans_table_enable(trans) = false;
661 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
662 ctx->table->flags & NFT_TABLE_F_DORMANT) {
663 ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table);
664 if (ret >= 0) {
665 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
666 nft_trans_table_enable(trans) = true;
667 }
668 }
669 if (ret < 0)
670 goto err;
671
672 nft_trans_table_update(trans) = true;
673 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
674 return 0;
675 err:
676 nft_trans_destroy(trans);
677 return ret;
678 }
679
680 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
681 struct sk_buff *skb, const struct nlmsghdr *nlh,
682 const struct nlattr * const nla[],
683 struct netlink_ext_ack *extack)
684 {
685 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
686 u8 genmask = nft_genmask_next(net);
687 const struct nlattr *name;
688 struct nft_af_info *afi;
689 struct nft_table *table;
690 int family = nfmsg->nfgen_family;
691 u32 flags = 0;
692 struct nft_ctx ctx;
693 int err;
694
695 afi = nf_tables_afinfo_lookup(net, family, true);
696 if (IS_ERR(afi))
697 return PTR_ERR(afi);
698
699 name = nla[NFTA_TABLE_NAME];
700 table = nf_tables_table_lookup(afi, name, genmask);
701 if (IS_ERR(table)) {
702 if (PTR_ERR(table) != -ENOENT)
703 return PTR_ERR(table);
704 } else {
705 if (nlh->nlmsg_flags & NLM_F_EXCL)
706 return -EEXIST;
707 if (nlh->nlmsg_flags & NLM_F_REPLACE)
708 return -EOPNOTSUPP;
709
710 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
711 return nf_tables_updtable(&ctx);
712 }
713
714 if (nla[NFTA_TABLE_FLAGS]) {
715 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
716 if (flags & ~NFT_TABLE_F_DORMANT)
717 return -EINVAL;
718 }
719
720 err = -EAFNOSUPPORT;
721 if (!try_module_get(afi->owner))
722 goto err1;
723
724 err = -ENOMEM;
725 table = kzalloc(sizeof(*table), GFP_KERNEL);
726 if (table == NULL)
727 goto err2;
728
729 table->name = nla_strdup(name, GFP_KERNEL);
730 if (table->name == NULL)
731 goto err3;
732
733 INIT_LIST_HEAD(&table->chains);
734 INIT_LIST_HEAD(&table->sets);
735 INIT_LIST_HEAD(&table->objects);
736 table->flags = flags;
737
738 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
739 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
740 if (err < 0)
741 goto err4;
742
743 list_add_tail_rcu(&table->list, &afi->tables);
744 return 0;
745 err4:
746 kfree(table->name);
747 err3:
748 kfree(table);
749 err2:
750 module_put(afi->owner);
751 err1:
752 return err;
753 }
754
755 static int nft_flush_table(struct nft_ctx *ctx)
756 {
757 int err;
758 struct nft_chain *chain, *nc;
759 struct nft_object *obj, *ne;
760 struct nft_set *set, *ns;
761
762 list_for_each_entry(chain, &ctx->table->chains, list) {
763 if (!nft_is_active_next(ctx->net, chain))
764 continue;
765
766 ctx->chain = chain;
767
768 err = nft_delrule_by_chain(ctx);
769 if (err < 0)
770 goto out;
771 }
772
773 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
774 if (!nft_is_active_next(ctx->net, set))
775 continue;
776
777 if (set->flags & NFT_SET_ANONYMOUS &&
778 !list_empty(&set->bindings))
779 continue;
780
781 err = nft_delset(ctx, set);
782 if (err < 0)
783 goto out;
784 }
785
786 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
787 err = nft_delobj(ctx, obj);
788 if (err < 0)
789 goto out;
790 }
791
792 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
793 if (!nft_is_active_next(ctx->net, chain))
794 continue;
795
796 ctx->chain = chain;
797
798 err = nft_delchain(ctx);
799 if (err < 0)
800 goto out;
801 }
802
803 err = nft_deltable(ctx);
804 out:
805 return err;
806 }
807
808 static int nft_flush(struct nft_ctx *ctx, int family)
809 {
810 struct nft_af_info *afi;
811 struct nft_table *table, *nt;
812 const struct nlattr * const *nla = ctx->nla;
813 int err = 0;
814
815 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
816 if (family != AF_UNSPEC && afi->family != family)
817 continue;
818
819 ctx->afi = afi;
820 list_for_each_entry_safe(table, nt, &afi->tables, list) {
821 if (!nft_is_active_next(ctx->net, table))
822 continue;
823
824 if (nla[NFTA_TABLE_NAME] &&
825 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
826 continue;
827
828 ctx->table = table;
829
830 err = nft_flush_table(ctx);
831 if (err < 0)
832 goto out;
833 }
834 }
835 out:
836 return err;
837 }
838
839 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
840 struct sk_buff *skb, const struct nlmsghdr *nlh,
841 const struct nlattr * const nla[],
842 struct netlink_ext_ack *extack)
843 {
844 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
845 u8 genmask = nft_genmask_next(net);
846 struct nft_af_info *afi;
847 struct nft_table *table;
848 int family = nfmsg->nfgen_family;
849 struct nft_ctx ctx;
850
851 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
852 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
853 return nft_flush(&ctx, family);
854
855 afi = nf_tables_afinfo_lookup(net, family, false);
856 if (IS_ERR(afi))
857 return PTR_ERR(afi);
858
859 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
860 if (IS_ERR(table))
861 return PTR_ERR(table);
862
863 if (nlh->nlmsg_flags & NLM_F_NONREC &&
864 table->use > 0)
865 return -EBUSY;
866
867 ctx.afi = afi;
868 ctx.table = table;
869
870 return nft_flush_table(&ctx);
871 }
872
873 static void nf_tables_table_destroy(struct nft_ctx *ctx)
874 {
875 BUG_ON(ctx->table->use > 0);
876
877 kfree(ctx->table->name);
878 kfree(ctx->table);
879 module_put(ctx->afi->owner);
880 }
881
882 int nft_register_chain_type(const struct nf_chain_type *ctype)
883 {
884 int err = 0;
885
886 if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO))
887 return -EINVAL;
888
889 nfnl_lock(NFNL_SUBSYS_NFTABLES);
890 if (chain_type[ctype->family][ctype->type] != NULL) {
891 err = -EBUSY;
892 goto out;
893 }
894 chain_type[ctype->family][ctype->type] = ctype;
895 out:
896 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
897 return err;
898 }
899 EXPORT_SYMBOL_GPL(nft_register_chain_type);
900
901 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
902 {
903 nfnl_lock(NFNL_SUBSYS_NFTABLES);
904 chain_type[ctype->family][ctype->type] = NULL;
905 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
906 }
907 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
908
909 /*
910 * Chains
911 */
912
913 static struct nft_chain *
914 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle,
915 u8 genmask)
916 {
917 struct nft_chain *chain;
918
919 list_for_each_entry(chain, &table->chains, list) {
920 if (chain->handle == handle &&
921 nft_active_genmask(chain, genmask))
922 return chain;
923 }
924
925 return ERR_PTR(-ENOENT);
926 }
927
928 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
929 const struct nlattr *nla,
930 u8 genmask)
931 {
932 struct nft_chain *chain;
933
934 if (nla == NULL)
935 return ERR_PTR(-EINVAL);
936
937 list_for_each_entry(chain, &table->chains, list) {
938 if (!nla_strcmp(nla, chain->name) &&
939 nft_active_genmask(chain, genmask))
940 return chain;
941 }
942
943 return ERR_PTR(-ENOENT);
944 }
945
946 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
947 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
948 .len = NFT_TABLE_MAXNAMELEN - 1 },
949 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
950 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
951 .len = NFT_CHAIN_MAXNAMELEN - 1 },
952 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
953 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
954 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
955 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
956 };
957
958 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
959 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
960 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
961 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
962 .len = IFNAMSIZ - 1 },
963 };
964
965 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
966 {
967 struct nft_stats *cpu_stats, total;
968 struct nlattr *nest;
969 unsigned int seq;
970 u64 pkts, bytes;
971 int cpu;
972
973 memset(&total, 0, sizeof(total));
974 for_each_possible_cpu(cpu) {
975 cpu_stats = per_cpu_ptr(stats, cpu);
976 do {
977 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
978 pkts = cpu_stats->pkts;
979 bytes = cpu_stats->bytes;
980 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
981 total.pkts += pkts;
982 total.bytes += bytes;
983 }
984 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
985 if (nest == NULL)
986 goto nla_put_failure;
987
988 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
989 NFTA_COUNTER_PAD) ||
990 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
991 NFTA_COUNTER_PAD))
992 goto nla_put_failure;
993
994 nla_nest_end(skb, nest);
995 return 0;
996
997 nla_put_failure:
998 return -ENOSPC;
999 }
1000
1001 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1002 u32 portid, u32 seq, int event, u32 flags,
1003 int family, const struct nft_table *table,
1004 const struct nft_chain *chain)
1005 {
1006 struct nlmsghdr *nlh;
1007 struct nfgenmsg *nfmsg;
1008
1009 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1010 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1011 if (nlh == NULL)
1012 goto nla_put_failure;
1013
1014 nfmsg = nlmsg_data(nlh);
1015 nfmsg->nfgen_family = family;
1016 nfmsg->version = NFNETLINK_V0;
1017 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1018
1019 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1020 goto nla_put_failure;
1021 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1022 NFTA_CHAIN_PAD))
1023 goto nla_put_failure;
1024 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1025 goto nla_put_failure;
1026
1027 if (nft_is_base_chain(chain)) {
1028 const struct nft_base_chain *basechain = nft_base_chain(chain);
1029 const struct nf_hook_ops *ops = &basechain->ops[0];
1030 struct nlattr *nest;
1031
1032 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
1033 if (nest == NULL)
1034 goto nla_put_failure;
1035 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1036 goto nla_put_failure;
1037 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1038 goto nla_put_failure;
1039 if (basechain->dev_name[0] &&
1040 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1041 goto nla_put_failure;
1042 nla_nest_end(skb, nest);
1043
1044 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1045 htonl(basechain->policy)))
1046 goto nla_put_failure;
1047
1048 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1049 goto nla_put_failure;
1050
1051 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
1052 goto nla_put_failure;
1053 }
1054
1055 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1056 goto nla_put_failure;
1057
1058 nlmsg_end(skb, nlh);
1059 return 0;
1060
1061 nla_put_failure:
1062 nlmsg_trim(skb, nlh);
1063 return -1;
1064 }
1065
1066 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1067 {
1068 struct sk_buff *skb;
1069 int err;
1070
1071 if (!ctx->report &&
1072 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1073 return;
1074
1075 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1076 if (skb == NULL)
1077 goto err;
1078
1079 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1080 event, 0, ctx->afi->family, ctx->table,
1081 ctx->chain);
1082 if (err < 0) {
1083 kfree_skb(skb);
1084 goto err;
1085 }
1086
1087 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1088 ctx->report, GFP_KERNEL);
1089 return;
1090 err:
1091 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1092 }
1093
1094 static int nf_tables_dump_chains(struct sk_buff *skb,
1095 struct netlink_callback *cb)
1096 {
1097 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1098 const struct nft_af_info *afi;
1099 const struct nft_table *table;
1100 const struct nft_chain *chain;
1101 unsigned int idx = 0, s_idx = cb->args[0];
1102 struct net *net = sock_net(skb->sk);
1103 int family = nfmsg->nfgen_family;
1104
1105 rcu_read_lock();
1106 cb->seq = net->nft.base_seq;
1107
1108 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1109 if (family != NFPROTO_UNSPEC && family != afi->family)
1110 continue;
1111
1112 list_for_each_entry_rcu(table, &afi->tables, list) {
1113 list_for_each_entry_rcu(chain, &table->chains, list) {
1114 if (idx < s_idx)
1115 goto cont;
1116 if (idx > s_idx)
1117 memset(&cb->args[1], 0,
1118 sizeof(cb->args) - sizeof(cb->args[0]));
1119 if (!nft_is_active(net, chain))
1120 continue;
1121 if (nf_tables_fill_chain_info(skb, net,
1122 NETLINK_CB(cb->skb).portid,
1123 cb->nlh->nlmsg_seq,
1124 NFT_MSG_NEWCHAIN,
1125 NLM_F_MULTI,
1126 afi->family, table, chain) < 0)
1127 goto done;
1128
1129 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1130 cont:
1131 idx++;
1132 }
1133 }
1134 }
1135 done:
1136 rcu_read_unlock();
1137 cb->args[0] = idx;
1138 return skb->len;
1139 }
1140
1141 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1142 struct sk_buff *skb, const struct nlmsghdr *nlh,
1143 const struct nlattr * const nla[],
1144 struct netlink_ext_ack *extack)
1145 {
1146 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1147 u8 genmask = nft_genmask_cur(net);
1148 const struct nft_af_info *afi;
1149 const struct nft_table *table;
1150 const struct nft_chain *chain;
1151 struct sk_buff *skb2;
1152 int family = nfmsg->nfgen_family;
1153 int err;
1154
1155 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1156 struct netlink_dump_control c = {
1157 .dump = nf_tables_dump_chains,
1158 };
1159 return netlink_dump_start(nlsk, skb, nlh, &c);
1160 }
1161
1162 afi = nf_tables_afinfo_lookup(net, family, false);
1163 if (IS_ERR(afi))
1164 return PTR_ERR(afi);
1165
1166 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1167 if (IS_ERR(table))
1168 return PTR_ERR(table);
1169
1170 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1171 if (IS_ERR(chain))
1172 return PTR_ERR(chain);
1173
1174 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1175 if (!skb2)
1176 return -ENOMEM;
1177
1178 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1179 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1180 family, table, chain);
1181 if (err < 0)
1182 goto err;
1183
1184 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1185
1186 err:
1187 kfree_skb(skb2);
1188 return err;
1189 }
1190
1191 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1192 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1193 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1194 };
1195
1196 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1197 {
1198 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1199 struct nft_stats __percpu *newstats;
1200 struct nft_stats *stats;
1201 int err;
1202
1203 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy,
1204 NULL);
1205 if (err < 0)
1206 return ERR_PTR(err);
1207
1208 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1209 return ERR_PTR(-EINVAL);
1210
1211 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1212 if (newstats == NULL)
1213 return ERR_PTR(-ENOMEM);
1214
1215 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1216 * are not exposed to userspace.
1217 */
1218 preempt_disable();
1219 stats = this_cpu_ptr(newstats);
1220 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1221 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1222 preempt_enable();
1223
1224 return newstats;
1225 }
1226
1227 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1228 struct nft_stats __percpu *newstats)
1229 {
1230 if (newstats == NULL)
1231 return;
1232
1233 if (chain->stats) {
1234 struct nft_stats __percpu *oldstats =
1235 nft_dereference(chain->stats);
1236
1237 rcu_assign_pointer(chain->stats, newstats);
1238 synchronize_rcu();
1239 free_percpu(oldstats);
1240 } else
1241 rcu_assign_pointer(chain->stats, newstats);
1242 }
1243
1244 static void nf_tables_chain_destroy(struct nft_chain *chain)
1245 {
1246 BUG_ON(chain->use > 0);
1247
1248 if (nft_is_base_chain(chain)) {
1249 struct nft_base_chain *basechain = nft_base_chain(chain);
1250
1251 module_put(basechain->type->owner);
1252 free_percpu(basechain->stats);
1253 if (basechain->stats)
1254 static_branch_dec(&nft_counters_enabled);
1255 if (basechain->ops[0].dev != NULL)
1256 dev_put(basechain->ops[0].dev);
1257 kfree(chain->name);
1258 kfree(basechain);
1259 } else {
1260 kfree(chain->name);
1261 kfree(chain);
1262 }
1263 }
1264
1265 struct nft_chain_hook {
1266 u32 num;
1267 u32 priority;
1268 const struct nf_chain_type *type;
1269 struct net_device *dev;
1270 };
1271
1272 static int nft_chain_parse_hook(struct net *net,
1273 const struct nlattr * const nla[],
1274 struct nft_af_info *afi,
1275 struct nft_chain_hook *hook, bool create)
1276 {
1277 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1278 const struct nf_chain_type *type;
1279 struct net_device *dev;
1280 int err;
1281
1282 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1283 nft_hook_policy, NULL);
1284 if (err < 0)
1285 return err;
1286
1287 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1288 ha[NFTA_HOOK_PRIORITY] == NULL)
1289 return -EINVAL;
1290
1291 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1292 if (hook->num >= afi->nhooks)
1293 return -EINVAL;
1294
1295 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1296
1297 type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT];
1298 if (nla[NFTA_CHAIN_TYPE]) {
1299 type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE],
1300 create);
1301 if (IS_ERR(type))
1302 return PTR_ERR(type);
1303 }
1304 if (!(type->hook_mask & (1 << hook->num)))
1305 return -EOPNOTSUPP;
1306 if (!try_module_get(type->owner))
1307 return -ENOENT;
1308
1309 hook->type = type;
1310
1311 hook->dev = NULL;
1312 if (afi->flags & NFT_AF_NEEDS_DEV) {
1313 char ifname[IFNAMSIZ];
1314
1315 if (!ha[NFTA_HOOK_DEV]) {
1316 module_put(type->owner);
1317 return -EOPNOTSUPP;
1318 }
1319
1320 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1321 dev = dev_get_by_name(net, ifname);
1322 if (!dev) {
1323 module_put(type->owner);
1324 return -ENOENT;
1325 }
1326 hook->dev = dev;
1327 } else if (ha[NFTA_HOOK_DEV]) {
1328 module_put(type->owner);
1329 return -EOPNOTSUPP;
1330 }
1331
1332 return 0;
1333 }
1334
1335 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1336 {
1337 module_put(hook->type->owner);
1338 if (hook->dev != NULL)
1339 dev_put(hook->dev);
1340 }
1341
1342 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1343 u8 policy, bool create)
1344 {
1345 const struct nlattr * const *nla = ctx->nla;
1346 struct nft_table *table = ctx->table;
1347 struct nft_af_info *afi = ctx->afi;
1348 struct nft_base_chain *basechain;
1349 struct nft_stats __percpu *stats;
1350 struct net *net = ctx->net;
1351 struct nft_chain *chain;
1352 unsigned int i;
1353 int err;
1354
1355 if (table->use == UINT_MAX)
1356 return -EOVERFLOW;
1357
1358 if (nla[NFTA_CHAIN_HOOK]) {
1359 struct nft_chain_hook hook;
1360 struct nf_hook_ops *ops;
1361 nf_hookfn *hookfn;
1362
1363 err = nft_chain_parse_hook(net, nla, afi, &hook, create);
1364 if (err < 0)
1365 return err;
1366
1367 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1368 if (basechain == NULL) {
1369 nft_chain_release_hook(&hook);
1370 return -ENOMEM;
1371 }
1372
1373 if (hook.dev != NULL)
1374 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1375
1376 if (nla[NFTA_CHAIN_COUNTERS]) {
1377 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1378 if (IS_ERR(stats)) {
1379 nft_chain_release_hook(&hook);
1380 kfree(basechain);
1381 return PTR_ERR(stats);
1382 }
1383 basechain->stats = stats;
1384 static_branch_inc(&nft_counters_enabled);
1385 }
1386
1387 hookfn = hook.type->hooks[hook.num];
1388 basechain->type = hook.type;
1389 chain = &basechain->chain;
1390
1391 for (i = 0; i < afi->nops; i++) {
1392 ops = &basechain->ops[i];
1393 ops->pf = family;
1394 ops->hooknum = hook.num;
1395 ops->priority = hook.priority;
1396 ops->priv = chain;
1397 ops->hook = afi->hooks[ops->hooknum];
1398 ops->dev = hook.dev;
1399 if (hookfn)
1400 ops->hook = hookfn;
1401 if (afi->hook_ops_init)
1402 afi->hook_ops_init(ops, i);
1403 }
1404
1405 chain->flags |= NFT_BASE_CHAIN;
1406 basechain->policy = policy;
1407 } else {
1408 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1409 if (chain == NULL)
1410 return -ENOMEM;
1411 }
1412 INIT_LIST_HEAD(&chain->rules);
1413 chain->handle = nf_tables_alloc_handle(table);
1414 chain->table = table;
1415 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1416 if (!chain->name) {
1417 err = -ENOMEM;
1418 goto err1;
1419 }
1420
1421 err = nf_tables_register_hooks(net, table, chain, afi->nops);
1422 if (err < 0)
1423 goto err1;
1424
1425 ctx->chain = chain;
1426 err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1427 if (err < 0)
1428 goto err2;
1429
1430 table->use++;
1431 list_add_tail_rcu(&chain->list, &table->chains);
1432
1433 return 0;
1434 err2:
1435 nf_tables_unregister_hooks(net, table, chain, afi->nops);
1436 err1:
1437 nf_tables_chain_destroy(chain);
1438
1439 return err;
1440 }
1441
1442 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
1443 bool create)
1444 {
1445 const struct nlattr * const *nla = ctx->nla;
1446 struct nft_table *table = ctx->table;
1447 struct nft_chain *chain = ctx->chain;
1448 struct nft_af_info *afi = ctx->afi;
1449 struct nft_base_chain *basechain;
1450 struct nft_stats *stats = NULL;
1451 struct nft_chain_hook hook;
1452 const struct nlattr *name;
1453 struct nf_hook_ops *ops;
1454 struct nft_trans *trans;
1455 int err, i;
1456
1457 if (nla[NFTA_CHAIN_HOOK]) {
1458 if (!nft_is_base_chain(chain))
1459 return -EBUSY;
1460
1461 err = nft_chain_parse_hook(ctx->net, nla, ctx->afi, &hook,
1462 create);
1463 if (err < 0)
1464 return err;
1465
1466 basechain = nft_base_chain(chain);
1467 if (basechain->type != hook.type) {
1468 nft_chain_release_hook(&hook);
1469 return -EBUSY;
1470 }
1471
1472 for (i = 0; i < afi->nops; i++) {
1473 ops = &basechain->ops[i];
1474 if (ops->hooknum != hook.num ||
1475 ops->priority != hook.priority ||
1476 ops->dev != hook.dev) {
1477 nft_chain_release_hook(&hook);
1478 return -EBUSY;
1479 }
1480 }
1481 nft_chain_release_hook(&hook);
1482 }
1483
1484 if (nla[NFTA_CHAIN_HANDLE] &&
1485 nla[NFTA_CHAIN_NAME]) {
1486 struct nft_chain *chain2;
1487
1488 chain2 = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME],
1489 genmask);
1490 if (IS_ERR(chain2))
1491 return PTR_ERR(chain2);
1492 }
1493
1494 if (nla[NFTA_CHAIN_COUNTERS]) {
1495 if (!nft_is_base_chain(chain))
1496 return -EOPNOTSUPP;
1497
1498 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1499 if (IS_ERR(stats))
1500 return PTR_ERR(stats);
1501 }
1502
1503 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
1504 sizeof(struct nft_trans_chain));
1505 if (trans == NULL) {
1506 free_percpu(stats);
1507 return -ENOMEM;
1508 }
1509
1510 nft_trans_chain_stats(trans) = stats;
1511 nft_trans_chain_update(trans) = true;
1512
1513 if (nla[NFTA_CHAIN_POLICY])
1514 nft_trans_chain_policy(trans) = policy;
1515 else
1516 nft_trans_chain_policy(trans) = -1;
1517
1518 name = nla[NFTA_CHAIN_NAME];
1519 if (nla[NFTA_CHAIN_HANDLE] && name) {
1520 nft_trans_chain_name(trans) =
1521 nla_strdup(name, GFP_KERNEL);
1522 if (!nft_trans_chain_name(trans)) {
1523 kfree(trans);
1524 free_percpu(stats);
1525 return -ENOMEM;
1526 }
1527 }
1528 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1529
1530 return 0;
1531 }
1532
1533 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1534 struct sk_buff *skb, const struct nlmsghdr *nlh,
1535 const struct nlattr * const nla[],
1536 struct netlink_ext_ack *extack)
1537 {
1538 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1539 const struct nlattr * uninitialized_var(name);
1540 u8 genmask = nft_genmask_next(net);
1541 int family = nfmsg->nfgen_family;
1542 struct nft_af_info *afi;
1543 struct nft_table *table;
1544 struct nft_chain *chain;
1545 u8 policy = NF_ACCEPT;
1546 struct nft_ctx ctx;
1547 u64 handle = 0;
1548 bool create;
1549
1550 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1551
1552 afi = nf_tables_afinfo_lookup(net, family, true);
1553 if (IS_ERR(afi))
1554 return PTR_ERR(afi);
1555
1556 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1557 if (IS_ERR(table))
1558 return PTR_ERR(table);
1559
1560 chain = NULL;
1561 name = nla[NFTA_CHAIN_NAME];
1562
1563 if (nla[NFTA_CHAIN_HANDLE]) {
1564 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1565 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
1566 if (IS_ERR(chain))
1567 return PTR_ERR(chain);
1568 } else {
1569 chain = nf_tables_chain_lookup(table, name, genmask);
1570 if (IS_ERR(chain)) {
1571 if (PTR_ERR(chain) != -ENOENT)
1572 return PTR_ERR(chain);
1573 chain = NULL;
1574 }
1575 }
1576
1577 if (nla[NFTA_CHAIN_POLICY]) {
1578 if (chain != NULL &&
1579 !nft_is_base_chain(chain))
1580 return -EOPNOTSUPP;
1581
1582 if (chain == NULL &&
1583 nla[NFTA_CHAIN_HOOK] == NULL)
1584 return -EOPNOTSUPP;
1585
1586 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1587 switch (policy) {
1588 case NF_DROP:
1589 case NF_ACCEPT:
1590 break;
1591 default:
1592 return -EINVAL;
1593 }
1594 }
1595
1596 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1597
1598 if (chain != NULL) {
1599 if (nlh->nlmsg_flags & NLM_F_EXCL)
1600 return -EEXIST;
1601 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1602 return -EOPNOTSUPP;
1603
1604 return nf_tables_updchain(&ctx, genmask, policy, create);
1605 }
1606
1607 return nf_tables_addchain(&ctx, family, genmask, policy, create);
1608 }
1609
1610 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1611 struct sk_buff *skb, const struct nlmsghdr *nlh,
1612 const struct nlattr * const nla[],
1613 struct netlink_ext_ack *extack)
1614 {
1615 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1616 u8 genmask = nft_genmask_next(net);
1617 struct nft_af_info *afi;
1618 struct nft_table *table;
1619 struct nft_chain *chain;
1620 struct nft_rule *rule;
1621 int family = nfmsg->nfgen_family;
1622 struct nft_ctx ctx;
1623 u32 use;
1624 int err;
1625
1626 afi = nf_tables_afinfo_lookup(net, family, false);
1627 if (IS_ERR(afi))
1628 return PTR_ERR(afi);
1629
1630 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1631 if (IS_ERR(table))
1632 return PTR_ERR(table);
1633
1634 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1635 if (IS_ERR(chain))
1636 return PTR_ERR(chain);
1637
1638 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1639 chain->use > 0)
1640 return -EBUSY;
1641
1642 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1643
1644 use = chain->use;
1645 list_for_each_entry(rule, &chain->rules, list) {
1646 if (!nft_is_active_next(net, rule))
1647 continue;
1648 use--;
1649
1650 err = nft_delrule(&ctx, rule);
1651 if (err < 0)
1652 return err;
1653 }
1654
1655 /* There are rules and elements that are still holding references to us,
1656 * we cannot do a recursive removal in this case.
1657 */
1658 if (use > 0)
1659 return -EBUSY;
1660
1661 return nft_delchain(&ctx);
1662 }
1663
1664 /*
1665 * Expressions
1666 */
1667
1668 /**
1669 * nft_register_expr - register nf_tables expr type
1670 * @ops: expr type
1671 *
1672 * Registers the expr type for use with nf_tables. Returns zero on
1673 * success or a negative errno code otherwise.
1674 */
1675 int nft_register_expr(struct nft_expr_type *type)
1676 {
1677 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1678 if (type->family == NFPROTO_UNSPEC)
1679 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1680 else
1681 list_add_rcu(&type->list, &nf_tables_expressions);
1682 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1683 return 0;
1684 }
1685 EXPORT_SYMBOL_GPL(nft_register_expr);
1686
1687 /**
1688 * nft_unregister_expr - unregister nf_tables expr type
1689 * @ops: expr type
1690 *
1691 * Unregisters the expr typefor use with nf_tables.
1692 */
1693 void nft_unregister_expr(struct nft_expr_type *type)
1694 {
1695 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1696 list_del_rcu(&type->list);
1697 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1698 }
1699 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1700
1701 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1702 struct nlattr *nla)
1703 {
1704 const struct nft_expr_type *type;
1705
1706 list_for_each_entry(type, &nf_tables_expressions, list) {
1707 if (!nla_strcmp(nla, type->name) &&
1708 (!type->family || type->family == family))
1709 return type;
1710 }
1711 return NULL;
1712 }
1713
1714 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1715 struct nlattr *nla)
1716 {
1717 const struct nft_expr_type *type;
1718
1719 if (nla == NULL)
1720 return ERR_PTR(-EINVAL);
1721
1722 type = __nft_expr_type_get(family, nla);
1723 if (type != NULL && try_module_get(type->owner))
1724 return type;
1725
1726 #ifdef CONFIG_MODULES
1727 if (type == NULL) {
1728 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1729 request_module("nft-expr-%u-%.*s", family,
1730 nla_len(nla), (char *)nla_data(nla));
1731 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1732 if (__nft_expr_type_get(family, nla))
1733 return ERR_PTR(-EAGAIN);
1734
1735 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1736 request_module("nft-expr-%.*s",
1737 nla_len(nla), (char *)nla_data(nla));
1738 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1739 if (__nft_expr_type_get(family, nla))
1740 return ERR_PTR(-EAGAIN);
1741 }
1742 #endif
1743 return ERR_PTR(-ENOENT);
1744 }
1745
1746 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1747 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1748 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1749 };
1750
1751 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1752 const struct nft_expr *expr)
1753 {
1754 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1755 goto nla_put_failure;
1756
1757 if (expr->ops->dump) {
1758 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1759 if (data == NULL)
1760 goto nla_put_failure;
1761 if (expr->ops->dump(skb, expr) < 0)
1762 goto nla_put_failure;
1763 nla_nest_end(skb, data);
1764 }
1765
1766 return skb->len;
1767
1768 nla_put_failure:
1769 return -1;
1770 };
1771
1772 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1773 const struct nft_expr *expr)
1774 {
1775 struct nlattr *nest;
1776
1777 nest = nla_nest_start(skb, attr);
1778 if (!nest)
1779 goto nla_put_failure;
1780 if (nf_tables_fill_expr_info(skb, expr) < 0)
1781 goto nla_put_failure;
1782 nla_nest_end(skb, nest);
1783 return 0;
1784
1785 nla_put_failure:
1786 return -1;
1787 }
1788
1789 struct nft_expr_info {
1790 const struct nft_expr_ops *ops;
1791 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1792 };
1793
1794 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1795 const struct nlattr *nla,
1796 struct nft_expr_info *info)
1797 {
1798 const struct nft_expr_type *type;
1799 const struct nft_expr_ops *ops;
1800 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1801 int err;
1802
1803 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL);
1804 if (err < 0)
1805 return err;
1806
1807 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1808 if (IS_ERR(type))
1809 return PTR_ERR(type);
1810
1811 if (tb[NFTA_EXPR_DATA]) {
1812 err = nla_parse_nested(info->tb, type->maxattr,
1813 tb[NFTA_EXPR_DATA], type->policy, NULL);
1814 if (err < 0)
1815 goto err1;
1816 } else
1817 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1818
1819 if (type->select_ops != NULL) {
1820 ops = type->select_ops(ctx,
1821 (const struct nlattr * const *)info->tb);
1822 if (IS_ERR(ops)) {
1823 err = PTR_ERR(ops);
1824 goto err1;
1825 }
1826 } else
1827 ops = type->ops;
1828
1829 info->ops = ops;
1830 return 0;
1831
1832 err1:
1833 module_put(type->owner);
1834 return err;
1835 }
1836
1837 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1838 const struct nft_expr_info *info,
1839 struct nft_expr *expr)
1840 {
1841 const struct nft_expr_ops *ops = info->ops;
1842 int err;
1843
1844 expr->ops = ops;
1845 if (ops->init) {
1846 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1847 if (err < 0)
1848 goto err1;
1849 }
1850
1851 if (ops->validate) {
1852 const struct nft_data *data = NULL;
1853
1854 err = ops->validate(ctx, expr, &data);
1855 if (err < 0)
1856 goto err2;
1857 }
1858
1859 return 0;
1860
1861 err2:
1862 if (ops->destroy)
1863 ops->destroy(ctx, expr);
1864 err1:
1865 expr->ops = NULL;
1866 return err;
1867 }
1868
1869 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1870 struct nft_expr *expr)
1871 {
1872 if (expr->ops->destroy)
1873 expr->ops->destroy(ctx, expr);
1874 module_put(expr->ops->type->owner);
1875 }
1876
1877 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1878 const struct nlattr *nla)
1879 {
1880 struct nft_expr_info info;
1881 struct nft_expr *expr;
1882 int err;
1883
1884 err = nf_tables_expr_parse(ctx, nla, &info);
1885 if (err < 0)
1886 goto err1;
1887
1888 err = -ENOMEM;
1889 expr = kzalloc(info.ops->size, GFP_KERNEL);
1890 if (expr == NULL)
1891 goto err2;
1892
1893 err = nf_tables_newexpr(ctx, &info, expr);
1894 if (err < 0)
1895 goto err3;
1896
1897 return expr;
1898 err3:
1899 kfree(expr);
1900 err2:
1901 module_put(info.ops->type->owner);
1902 err1:
1903 return ERR_PTR(err);
1904 }
1905
1906 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1907 {
1908 nf_tables_expr_destroy(ctx, expr);
1909 kfree(expr);
1910 }
1911
1912 /*
1913 * Rules
1914 */
1915
1916 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1917 u64 handle)
1918 {
1919 struct nft_rule *rule;
1920
1921 // FIXME: this sucks
1922 list_for_each_entry(rule, &chain->rules, list) {
1923 if (handle == rule->handle)
1924 return rule;
1925 }
1926
1927 return ERR_PTR(-ENOENT);
1928 }
1929
1930 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1931 const struct nlattr *nla)
1932 {
1933 if (nla == NULL)
1934 return ERR_PTR(-EINVAL);
1935
1936 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1937 }
1938
1939 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1940 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
1941 .len = NFT_TABLE_MAXNAMELEN - 1 },
1942 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1943 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1944 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1945 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1946 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1947 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1948 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1949 .len = NFT_USERDATA_MAXLEN },
1950 };
1951
1952 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1953 u32 portid, u32 seq, int event,
1954 u32 flags, int family,
1955 const struct nft_table *table,
1956 const struct nft_chain *chain,
1957 const struct nft_rule *rule)
1958 {
1959 struct nlmsghdr *nlh;
1960 struct nfgenmsg *nfmsg;
1961 const struct nft_expr *expr, *next;
1962 struct nlattr *list;
1963 const struct nft_rule *prule;
1964 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1965
1966 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
1967 if (nlh == NULL)
1968 goto nla_put_failure;
1969
1970 nfmsg = nlmsg_data(nlh);
1971 nfmsg->nfgen_family = family;
1972 nfmsg->version = NFNETLINK_V0;
1973 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1974
1975 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1976 goto nla_put_failure;
1977 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1978 goto nla_put_failure;
1979 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1980 NFTA_RULE_PAD))
1981 goto nla_put_failure;
1982
1983 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1984 prule = list_prev_entry(rule, list);
1985 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1986 cpu_to_be64(prule->handle),
1987 NFTA_RULE_PAD))
1988 goto nla_put_failure;
1989 }
1990
1991 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1992 if (list == NULL)
1993 goto nla_put_failure;
1994 nft_rule_for_each_expr(expr, next, rule) {
1995 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
1996 goto nla_put_failure;
1997 }
1998 nla_nest_end(skb, list);
1999
2000 if (rule->udata) {
2001 struct nft_userdata *udata = nft_userdata(rule);
2002 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2003 udata->data) < 0)
2004 goto nla_put_failure;
2005 }
2006
2007 nlmsg_end(skb, nlh);
2008 return 0;
2009
2010 nla_put_failure:
2011 nlmsg_trim(skb, nlh);
2012 return -1;
2013 }
2014
2015 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2016 const struct nft_rule *rule, int event)
2017 {
2018 struct sk_buff *skb;
2019 int err;
2020
2021 if (!ctx->report &&
2022 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2023 return;
2024
2025 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2026 if (skb == NULL)
2027 goto err;
2028
2029 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2030 event, 0, ctx->afi->family, ctx->table,
2031 ctx->chain, rule);
2032 if (err < 0) {
2033 kfree_skb(skb);
2034 goto err;
2035 }
2036
2037 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2038 ctx->report, GFP_KERNEL);
2039 return;
2040 err:
2041 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2042 }
2043
2044 struct nft_rule_dump_ctx {
2045 char *table;
2046 char *chain;
2047 };
2048
2049 static int nf_tables_dump_rules(struct sk_buff *skb,
2050 struct netlink_callback *cb)
2051 {
2052 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2053 const struct nft_rule_dump_ctx *ctx = cb->data;
2054 const struct nft_af_info *afi;
2055 const struct nft_table *table;
2056 const struct nft_chain *chain;
2057 const struct nft_rule *rule;
2058 unsigned int idx = 0, s_idx = cb->args[0];
2059 struct net *net = sock_net(skb->sk);
2060 int family = nfmsg->nfgen_family;
2061
2062 rcu_read_lock();
2063 cb->seq = net->nft.base_seq;
2064
2065 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2066 if (family != NFPROTO_UNSPEC && family != afi->family)
2067 continue;
2068
2069 list_for_each_entry_rcu(table, &afi->tables, list) {
2070 if (ctx && ctx->table &&
2071 strcmp(ctx->table, table->name) != 0)
2072 continue;
2073
2074 list_for_each_entry_rcu(chain, &table->chains, list) {
2075 if (ctx && ctx->chain[0] &&
2076 strcmp(ctx->chain, chain->name) != 0)
2077 continue;
2078
2079 list_for_each_entry_rcu(rule, &chain->rules, list) {
2080 if (!nft_is_active(net, rule))
2081 goto cont;
2082 if (idx < s_idx)
2083 goto cont;
2084 if (idx > s_idx)
2085 memset(&cb->args[1], 0,
2086 sizeof(cb->args) - sizeof(cb->args[0]));
2087 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2088 cb->nlh->nlmsg_seq,
2089 NFT_MSG_NEWRULE,
2090 NLM_F_MULTI | NLM_F_APPEND,
2091 afi->family, table, chain, rule) < 0)
2092 goto done;
2093
2094 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2095 cont:
2096 idx++;
2097 }
2098 }
2099 }
2100 }
2101 done:
2102 rcu_read_unlock();
2103
2104 cb->args[0] = idx;
2105 return skb->len;
2106 }
2107
2108 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2109 {
2110 struct nft_rule_dump_ctx *ctx = cb->data;
2111
2112 if (ctx) {
2113 kfree(ctx->table);
2114 kfree(ctx->chain);
2115 kfree(ctx);
2116 }
2117 return 0;
2118 }
2119
2120 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2121 struct sk_buff *skb, const struct nlmsghdr *nlh,
2122 const struct nlattr * const nla[],
2123 struct netlink_ext_ack *extack)
2124 {
2125 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2126 u8 genmask = nft_genmask_cur(net);
2127 const struct nft_af_info *afi;
2128 const struct nft_table *table;
2129 const struct nft_chain *chain;
2130 const struct nft_rule *rule;
2131 struct sk_buff *skb2;
2132 int family = nfmsg->nfgen_family;
2133 int err;
2134
2135 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2136 struct netlink_dump_control c = {
2137 .dump = nf_tables_dump_rules,
2138 .done = nf_tables_dump_rules_done,
2139 };
2140
2141 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2142 struct nft_rule_dump_ctx *ctx;
2143
2144 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
2145 if (!ctx)
2146 return -ENOMEM;
2147
2148 if (nla[NFTA_RULE_TABLE]) {
2149 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2150 GFP_KERNEL);
2151 if (!ctx->table) {
2152 kfree(ctx);
2153 return -ENOMEM;
2154 }
2155 }
2156 if (nla[NFTA_RULE_CHAIN]) {
2157 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2158 GFP_KERNEL);
2159 if (!ctx->chain) {
2160 kfree(ctx->table);
2161 kfree(ctx);
2162 return -ENOMEM;
2163 }
2164 }
2165 c.data = ctx;
2166 }
2167
2168 return netlink_dump_start(nlsk, skb, nlh, &c);
2169 }
2170
2171 afi = nf_tables_afinfo_lookup(net, family, false);
2172 if (IS_ERR(afi))
2173 return PTR_ERR(afi);
2174
2175 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2176 if (IS_ERR(table))
2177 return PTR_ERR(table);
2178
2179 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2180 if (IS_ERR(chain))
2181 return PTR_ERR(chain);
2182
2183 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2184 if (IS_ERR(rule))
2185 return PTR_ERR(rule);
2186
2187 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2188 if (!skb2)
2189 return -ENOMEM;
2190
2191 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2192 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2193 family, table, chain, rule);
2194 if (err < 0)
2195 goto err;
2196
2197 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2198
2199 err:
2200 kfree_skb(skb2);
2201 return err;
2202 }
2203
2204 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2205 struct nft_rule *rule)
2206 {
2207 struct nft_expr *expr;
2208
2209 /*
2210 * Careful: some expressions might not be initialized in case this
2211 * is called on error from nf_tables_newrule().
2212 */
2213 expr = nft_expr_first(rule);
2214 while (expr != nft_expr_last(rule) && expr->ops) {
2215 nf_tables_expr_destroy(ctx, expr);
2216 expr = nft_expr_next(expr);
2217 }
2218 kfree(rule);
2219 }
2220
2221 #define NFT_RULE_MAXEXPRS 128
2222
2223 static struct nft_expr_info *info;
2224
2225 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2226 struct sk_buff *skb, const struct nlmsghdr *nlh,
2227 const struct nlattr * const nla[],
2228 struct netlink_ext_ack *extack)
2229 {
2230 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2231 u8 genmask = nft_genmask_next(net);
2232 struct nft_af_info *afi;
2233 struct nft_table *table;
2234 struct nft_chain *chain;
2235 struct nft_rule *rule, *old_rule = NULL;
2236 struct nft_userdata *udata;
2237 struct nft_trans *trans = NULL;
2238 struct nft_expr *expr;
2239 struct nft_ctx ctx;
2240 struct nlattr *tmp;
2241 unsigned int size, i, n, ulen = 0, usize = 0;
2242 int err, rem;
2243 bool create;
2244 u64 handle, pos_handle;
2245
2246 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2247
2248 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2249 if (IS_ERR(afi))
2250 return PTR_ERR(afi);
2251
2252 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2253 if (IS_ERR(table))
2254 return PTR_ERR(table);
2255
2256 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2257 if (IS_ERR(chain))
2258 return PTR_ERR(chain);
2259
2260 if (nla[NFTA_RULE_HANDLE]) {
2261 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2262 rule = __nf_tables_rule_lookup(chain, handle);
2263 if (IS_ERR(rule))
2264 return PTR_ERR(rule);
2265
2266 if (nlh->nlmsg_flags & NLM_F_EXCL)
2267 return -EEXIST;
2268 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2269 old_rule = rule;
2270 else
2271 return -EOPNOTSUPP;
2272 } else {
2273 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2274 return -EINVAL;
2275 handle = nf_tables_alloc_handle(table);
2276
2277 if (chain->use == UINT_MAX)
2278 return -EOVERFLOW;
2279 }
2280
2281 if (nla[NFTA_RULE_POSITION]) {
2282 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2283 return -EOPNOTSUPP;
2284
2285 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2286 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2287 if (IS_ERR(old_rule))
2288 return PTR_ERR(old_rule);
2289 }
2290
2291 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2292
2293 n = 0;
2294 size = 0;
2295 if (nla[NFTA_RULE_EXPRESSIONS]) {
2296 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2297 err = -EINVAL;
2298 if (nla_type(tmp) != NFTA_LIST_ELEM)
2299 goto err1;
2300 if (n == NFT_RULE_MAXEXPRS)
2301 goto err1;
2302 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2303 if (err < 0)
2304 goto err1;
2305 size += info[n].ops->size;
2306 n++;
2307 }
2308 }
2309 /* Check for overflow of dlen field */
2310 err = -EFBIG;
2311 if (size >= 1 << 12)
2312 goto err1;
2313
2314 if (nla[NFTA_RULE_USERDATA]) {
2315 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2316 if (ulen > 0)
2317 usize = sizeof(struct nft_userdata) + ulen;
2318 }
2319
2320 err = -ENOMEM;
2321 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2322 if (rule == NULL)
2323 goto err1;
2324
2325 nft_activate_next(net, rule);
2326
2327 rule->handle = handle;
2328 rule->dlen = size;
2329 rule->udata = ulen ? 1 : 0;
2330
2331 if (ulen) {
2332 udata = nft_userdata(rule);
2333 udata->len = ulen - 1;
2334 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2335 }
2336
2337 expr = nft_expr_first(rule);
2338 for (i = 0; i < n; i++) {
2339 err = nf_tables_newexpr(&ctx, &info[i], expr);
2340 if (err < 0)
2341 goto err2;
2342 info[i].ops = NULL;
2343 expr = nft_expr_next(expr);
2344 }
2345
2346 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2347 if (nft_is_active_next(net, old_rule)) {
2348 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2349 old_rule);
2350 if (trans == NULL) {
2351 err = -ENOMEM;
2352 goto err2;
2353 }
2354 nft_deactivate_next(net, old_rule);
2355 chain->use--;
2356 list_add_tail_rcu(&rule->list, &old_rule->list);
2357 } else {
2358 err = -ENOENT;
2359 goto err2;
2360 }
2361 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2362 if (old_rule)
2363 list_add_rcu(&rule->list, &old_rule->list);
2364 else
2365 list_add_tail_rcu(&rule->list, &chain->rules);
2366 else {
2367 if (old_rule)
2368 list_add_tail_rcu(&rule->list, &old_rule->list);
2369 else
2370 list_add_rcu(&rule->list, &chain->rules);
2371 }
2372
2373 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2374 err = -ENOMEM;
2375 goto err3;
2376 }
2377 chain->use++;
2378 return 0;
2379
2380 err3:
2381 list_del_rcu(&rule->list);
2382 err2:
2383 nf_tables_rule_destroy(&ctx, rule);
2384 err1:
2385 for (i = 0; i < n; i++) {
2386 if (info[i].ops != NULL)
2387 module_put(info[i].ops->type->owner);
2388 }
2389 return err;
2390 }
2391
2392 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2393 const struct nlattr *nla)
2394 {
2395 u32 id = ntohl(nla_get_be32(nla));
2396 struct nft_trans *trans;
2397
2398 list_for_each_entry(trans, &net->nft.commit_list, list) {
2399 struct nft_rule *rule = nft_trans_rule(trans);
2400
2401 if (trans->msg_type == NFT_MSG_NEWRULE &&
2402 id == nft_trans_rule_id(trans))
2403 return rule;
2404 }
2405 return ERR_PTR(-ENOENT);
2406 }
2407
2408 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2409 struct sk_buff *skb, const struct nlmsghdr *nlh,
2410 const struct nlattr * const nla[],
2411 struct netlink_ext_ack *extack)
2412 {
2413 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2414 u8 genmask = nft_genmask_next(net);
2415 struct nft_af_info *afi;
2416 struct nft_table *table;
2417 struct nft_chain *chain = NULL;
2418 struct nft_rule *rule;
2419 int family = nfmsg->nfgen_family, err = 0;
2420 struct nft_ctx ctx;
2421
2422 afi = nf_tables_afinfo_lookup(net, family, false);
2423 if (IS_ERR(afi))
2424 return PTR_ERR(afi);
2425
2426 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2427 if (IS_ERR(table))
2428 return PTR_ERR(table);
2429
2430 if (nla[NFTA_RULE_CHAIN]) {
2431 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2432 genmask);
2433 if (IS_ERR(chain))
2434 return PTR_ERR(chain);
2435 }
2436
2437 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2438
2439 if (chain) {
2440 if (nla[NFTA_RULE_HANDLE]) {
2441 rule = nf_tables_rule_lookup(chain,
2442 nla[NFTA_RULE_HANDLE]);
2443 if (IS_ERR(rule))
2444 return PTR_ERR(rule);
2445
2446 err = nft_delrule(&ctx, rule);
2447 } else if (nla[NFTA_RULE_ID]) {
2448 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2449 if (IS_ERR(rule))
2450 return PTR_ERR(rule);
2451
2452 err = nft_delrule(&ctx, rule);
2453 } else {
2454 err = nft_delrule_by_chain(&ctx);
2455 }
2456 } else {
2457 list_for_each_entry(chain, &table->chains, list) {
2458 if (!nft_is_active_next(net, chain))
2459 continue;
2460
2461 ctx.chain = chain;
2462 err = nft_delrule_by_chain(&ctx);
2463 if (err < 0)
2464 break;
2465 }
2466 }
2467
2468 return err;
2469 }
2470
2471 /*
2472 * Sets
2473 */
2474
2475 static LIST_HEAD(nf_tables_set_types);
2476
2477 int nft_register_set(struct nft_set_type *type)
2478 {
2479 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2480 list_add_tail_rcu(&type->list, &nf_tables_set_types);
2481 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2482 return 0;
2483 }
2484 EXPORT_SYMBOL_GPL(nft_register_set);
2485
2486 void nft_unregister_set(struct nft_set_type *type)
2487 {
2488 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2489 list_del_rcu(&type->list);
2490 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2491 }
2492 EXPORT_SYMBOL_GPL(nft_unregister_set);
2493
2494 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
2495 NFT_SET_TIMEOUT | NFT_SET_OBJECT)
2496
2497 static bool nft_set_ops_candidate(const struct nft_set_ops *ops, u32 flags)
2498 {
2499 return (flags & ops->features) == (flags & NFT_SET_FEATURES);
2500 }
2501
2502 /*
2503 * Select a set implementation based on the data characteristics and the
2504 * given policy. The total memory use might not be known if no size is
2505 * given, in that case the amount of memory per element is used.
2506 */
2507 static const struct nft_set_ops *
2508 nft_select_set_ops(const struct nft_ctx *ctx,
2509 const struct nlattr * const nla[],
2510 const struct nft_set_desc *desc,
2511 enum nft_set_policies policy)
2512 {
2513 const struct nft_set_ops *ops, *bops;
2514 struct nft_set_estimate est, best;
2515 const struct nft_set_type *type;
2516 u32 flags = 0;
2517
2518 #ifdef CONFIG_MODULES
2519 if (list_empty(&nf_tables_set_types)) {
2520 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2521 request_module("nft-set");
2522 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2523 if (!list_empty(&nf_tables_set_types))
2524 return ERR_PTR(-EAGAIN);
2525 }
2526 #endif
2527 if (nla[NFTA_SET_FLAGS] != NULL)
2528 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2529
2530 bops = NULL;
2531 best.size = ~0;
2532 best.lookup = ~0;
2533 best.space = ~0;
2534
2535 list_for_each_entry(type, &nf_tables_set_types, list) {
2536 if (!type->select_ops)
2537 ops = type->ops;
2538 else
2539 ops = type->select_ops(ctx, desc, flags);
2540 if (!ops)
2541 continue;
2542
2543 if (!nft_set_ops_candidate(ops, flags))
2544 continue;
2545 if (!ops->estimate(desc, flags, &est))
2546 continue;
2547
2548 switch (policy) {
2549 case NFT_SET_POL_PERFORMANCE:
2550 if (est.lookup < best.lookup)
2551 break;
2552 if (est.lookup == best.lookup) {
2553 if (!desc->size) {
2554 if (est.space < best.space)
2555 break;
2556 } else if (est.size < best.size) {
2557 break;
2558 }
2559 }
2560 continue;
2561 case NFT_SET_POL_MEMORY:
2562 if (!desc->size) {
2563 if (est.space < best.space)
2564 break;
2565 if (est.space == best.space &&
2566 est.lookup < best.lookup)
2567 break;
2568 } else if (est.size < best.size) {
2569 break;
2570 }
2571 continue;
2572 default:
2573 break;
2574 }
2575
2576 if (!try_module_get(type->owner))
2577 continue;
2578 if (bops != NULL)
2579 module_put(bops->type->owner);
2580
2581 bops = ops;
2582 best = est;
2583 }
2584
2585 if (bops != NULL)
2586 return bops;
2587
2588 return ERR_PTR(-EOPNOTSUPP);
2589 }
2590
2591 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2592 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2593 .len = NFT_TABLE_MAXNAMELEN - 1 },
2594 [NFTA_SET_NAME] = { .type = NLA_STRING,
2595 .len = NFT_SET_MAXNAMELEN - 1 },
2596 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2597 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2598 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2599 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2600 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2601 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2602 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2603 [NFTA_SET_ID] = { .type = NLA_U32 },
2604 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2605 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2606 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2607 .len = NFT_USERDATA_MAXLEN },
2608 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
2609 };
2610
2611 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2612 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2613 };
2614
2615 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2616 const struct sk_buff *skb,
2617 const struct nlmsghdr *nlh,
2618 const struct nlattr * const nla[],
2619 u8 genmask)
2620 {
2621 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2622 struct nft_af_info *afi = NULL;
2623 struct nft_table *table = NULL;
2624
2625 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2626 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2627 if (IS_ERR(afi))
2628 return PTR_ERR(afi);
2629 }
2630
2631 if (nla[NFTA_SET_TABLE] != NULL) {
2632 if (afi == NULL)
2633 return -EAFNOSUPPORT;
2634
2635 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2636 genmask);
2637 if (IS_ERR(table))
2638 return PTR_ERR(table);
2639 }
2640
2641 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
2642 return 0;
2643 }
2644
2645 static struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2646 const struct nlattr *nla, u8 genmask)
2647 {
2648 struct nft_set *set;
2649
2650 if (nla == NULL)
2651 return ERR_PTR(-EINVAL);
2652
2653 list_for_each_entry(set, &table->sets, list) {
2654 if (!nla_strcmp(nla, set->name) &&
2655 nft_active_genmask(set, genmask))
2656 return set;
2657 }
2658 return ERR_PTR(-ENOENT);
2659 }
2660
2661 static struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2662 const struct nlattr *nla,
2663 u8 genmask)
2664 {
2665 struct nft_trans *trans;
2666 u32 id = ntohl(nla_get_be32(nla));
2667
2668 list_for_each_entry(trans, &net->nft.commit_list, list) {
2669 struct nft_set *set = nft_trans_set(trans);
2670
2671 if (trans->msg_type == NFT_MSG_NEWSET &&
2672 id == nft_trans_set_id(trans) &&
2673 nft_active_genmask(set, genmask))
2674 return set;
2675 }
2676 return ERR_PTR(-ENOENT);
2677 }
2678
2679 struct nft_set *nft_set_lookup(const struct net *net,
2680 const struct nft_table *table,
2681 const struct nlattr *nla_set_name,
2682 const struct nlattr *nla_set_id,
2683 u8 genmask)
2684 {
2685 struct nft_set *set;
2686
2687 set = nf_tables_set_lookup(table, nla_set_name, genmask);
2688 if (IS_ERR(set)) {
2689 if (!nla_set_id)
2690 return set;
2691
2692 set = nf_tables_set_lookup_byid(net, nla_set_id, genmask);
2693 }
2694 return set;
2695 }
2696 EXPORT_SYMBOL_GPL(nft_set_lookup);
2697
2698 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2699 const char *name)
2700 {
2701 const struct nft_set *i;
2702 const char *p;
2703 unsigned long *inuse;
2704 unsigned int n = 0, min = 0;
2705
2706 p = strchr(name, '%');
2707 if (p != NULL) {
2708 if (p[1] != 'd' || strchr(p + 2, '%'))
2709 return -EINVAL;
2710
2711 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2712 if (inuse == NULL)
2713 return -ENOMEM;
2714 cont:
2715 list_for_each_entry(i, &ctx->table->sets, list) {
2716 int tmp;
2717
2718 if (!nft_is_active_next(ctx->net, set))
2719 continue;
2720 if (!sscanf(i->name, name, &tmp))
2721 continue;
2722 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2723 continue;
2724
2725 set_bit(tmp - min, inuse);
2726 }
2727
2728 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2729 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2730 min += BITS_PER_BYTE * PAGE_SIZE;
2731 memset(inuse, 0, PAGE_SIZE);
2732 goto cont;
2733 }
2734 free_page((unsigned long)inuse);
2735 }
2736
2737 set->name = kasprintf(GFP_KERNEL, name, min + n);
2738 if (!set->name)
2739 return -ENOMEM;
2740
2741 list_for_each_entry(i, &ctx->table->sets, list) {
2742 if (!nft_is_active_next(ctx->net, i))
2743 continue;
2744 if (!strcmp(set->name, i->name))
2745 return -ENFILE;
2746 }
2747 return 0;
2748 }
2749
2750 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2751 const struct nft_set *set, u16 event, u16 flags)
2752 {
2753 struct nfgenmsg *nfmsg;
2754 struct nlmsghdr *nlh;
2755 struct nlattr *desc;
2756 u32 portid = ctx->portid;
2757 u32 seq = ctx->seq;
2758
2759 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2760 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2761 flags);
2762 if (nlh == NULL)
2763 goto nla_put_failure;
2764
2765 nfmsg = nlmsg_data(nlh);
2766 nfmsg->nfgen_family = ctx->afi->family;
2767 nfmsg->version = NFNETLINK_V0;
2768 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2769
2770 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2771 goto nla_put_failure;
2772 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2773 goto nla_put_failure;
2774 if (set->flags != 0)
2775 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2776 goto nla_put_failure;
2777
2778 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2779 goto nla_put_failure;
2780 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2781 goto nla_put_failure;
2782 if (set->flags & NFT_SET_MAP) {
2783 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2784 goto nla_put_failure;
2785 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2786 goto nla_put_failure;
2787 }
2788 if (set->flags & NFT_SET_OBJECT &&
2789 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
2790 goto nla_put_failure;
2791
2792 if (set->timeout &&
2793 nla_put_be64(skb, NFTA_SET_TIMEOUT,
2794 cpu_to_be64(jiffies_to_msecs(set->timeout)),
2795 NFTA_SET_PAD))
2796 goto nla_put_failure;
2797 if (set->gc_int &&
2798 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2799 goto nla_put_failure;
2800
2801 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2802 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2803 goto nla_put_failure;
2804 }
2805
2806 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2807 goto nla_put_failure;
2808
2809 desc = nla_nest_start(skb, NFTA_SET_DESC);
2810 if (desc == NULL)
2811 goto nla_put_failure;
2812 if (set->size &&
2813 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2814 goto nla_put_failure;
2815 nla_nest_end(skb, desc);
2816
2817 nlmsg_end(skb, nlh);
2818 return 0;
2819
2820 nla_put_failure:
2821 nlmsg_trim(skb, nlh);
2822 return -1;
2823 }
2824
2825 static void nf_tables_set_notify(const struct nft_ctx *ctx,
2826 const struct nft_set *set, int event,
2827 gfp_t gfp_flags)
2828 {
2829 struct sk_buff *skb;
2830 u32 portid = ctx->portid;
2831 int err;
2832
2833 if (!ctx->report &&
2834 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2835 return;
2836
2837 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2838 if (skb == NULL)
2839 goto err;
2840
2841 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2842 if (err < 0) {
2843 kfree_skb(skb);
2844 goto err;
2845 }
2846
2847 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
2848 gfp_flags);
2849 return;
2850 err:
2851 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
2852 }
2853
2854 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2855 {
2856 const struct nft_set *set;
2857 unsigned int idx, s_idx = cb->args[0];
2858 struct nft_af_info *afi;
2859 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2860 struct net *net = sock_net(skb->sk);
2861 int cur_family = cb->args[3];
2862 struct nft_ctx *ctx = cb->data, ctx_set;
2863
2864 if (cb->args[1])
2865 return skb->len;
2866
2867 rcu_read_lock();
2868 cb->seq = net->nft.base_seq;
2869
2870 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2871 if (ctx->afi && ctx->afi != afi)
2872 continue;
2873
2874 if (cur_family) {
2875 if (afi->family != cur_family)
2876 continue;
2877
2878 cur_family = 0;
2879 }
2880 list_for_each_entry_rcu(table, &afi->tables, list) {
2881 if (ctx->table && ctx->table != table)
2882 continue;
2883
2884 if (cur_table) {
2885 if (cur_table != table)
2886 continue;
2887
2888 cur_table = NULL;
2889 }
2890 idx = 0;
2891 list_for_each_entry_rcu(set, &table->sets, list) {
2892 if (idx < s_idx)
2893 goto cont;
2894 if (!nft_is_active(net, set))
2895 goto cont;
2896
2897 ctx_set = *ctx;
2898 ctx_set.table = table;
2899 ctx_set.afi = afi;
2900 if (nf_tables_fill_set(skb, &ctx_set, set,
2901 NFT_MSG_NEWSET,
2902 NLM_F_MULTI) < 0) {
2903 cb->args[0] = idx;
2904 cb->args[2] = (unsigned long) table;
2905 cb->args[3] = afi->family;
2906 goto done;
2907 }
2908 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2909 cont:
2910 idx++;
2911 }
2912 if (s_idx)
2913 s_idx = 0;
2914 }
2915 }
2916 cb->args[1] = 1;
2917 done:
2918 rcu_read_unlock();
2919 return skb->len;
2920 }
2921
2922 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2923 {
2924 kfree(cb->data);
2925 return 0;
2926 }
2927
2928 static int nf_tables_getset(struct net *net, struct sock *nlsk,
2929 struct sk_buff *skb, const struct nlmsghdr *nlh,
2930 const struct nlattr * const nla[],
2931 struct netlink_ext_ack *extack)
2932 {
2933 u8 genmask = nft_genmask_cur(net);
2934 const struct nft_set *set;
2935 struct nft_ctx ctx;
2936 struct sk_buff *skb2;
2937 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2938 int err;
2939
2940 /* Verify existence before starting dump */
2941 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
2942 if (err < 0)
2943 return err;
2944
2945 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2946 struct netlink_dump_control c = {
2947 .dump = nf_tables_dump_sets,
2948 .done = nf_tables_dump_sets_done,
2949 };
2950 struct nft_ctx *ctx_dump;
2951
2952 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2953 if (ctx_dump == NULL)
2954 return -ENOMEM;
2955
2956 *ctx_dump = ctx;
2957 c.data = ctx_dump;
2958
2959 return netlink_dump_start(nlsk, skb, nlh, &c);
2960 }
2961
2962 /* Only accept unspec with dump */
2963 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2964 return -EAFNOSUPPORT;
2965 if (!nla[NFTA_SET_TABLE])
2966 return -EINVAL;
2967
2968 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
2969 if (IS_ERR(set))
2970 return PTR_ERR(set);
2971
2972 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2973 if (skb2 == NULL)
2974 return -ENOMEM;
2975
2976 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2977 if (err < 0)
2978 goto err;
2979
2980 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2981
2982 err:
2983 kfree_skb(skb2);
2984 return err;
2985 }
2986
2987 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2988 struct nft_set_desc *desc,
2989 const struct nlattr *nla)
2990 {
2991 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2992 int err;
2993
2994 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
2995 nft_set_desc_policy, NULL);
2996 if (err < 0)
2997 return err;
2998
2999 if (da[NFTA_SET_DESC_SIZE] != NULL)
3000 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
3001
3002 return 0;
3003 }
3004
3005 static int nf_tables_newset(struct net *net, struct sock *nlsk,
3006 struct sk_buff *skb, const struct nlmsghdr *nlh,
3007 const struct nlattr * const nla[],
3008 struct netlink_ext_ack *extack)
3009 {
3010 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3011 u8 genmask = nft_genmask_next(net);
3012 const struct nft_set_ops *ops;
3013 struct nft_af_info *afi;
3014 struct nft_table *table;
3015 struct nft_set *set;
3016 struct nft_ctx ctx;
3017 char *name;
3018 unsigned int size;
3019 bool create;
3020 u64 timeout;
3021 u32 ktype, dtype, flags, policy, gc_int, objtype;
3022 struct nft_set_desc desc;
3023 unsigned char *udata;
3024 u16 udlen;
3025 int err;
3026
3027 if (nla[NFTA_SET_TABLE] == NULL ||
3028 nla[NFTA_SET_NAME] == NULL ||
3029 nla[NFTA_SET_KEY_LEN] == NULL ||
3030 nla[NFTA_SET_ID] == NULL)
3031 return -EINVAL;
3032
3033 memset(&desc, 0, sizeof(desc));
3034
3035 ktype = NFT_DATA_VALUE;
3036 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3037 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3038 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3039 return -EINVAL;
3040 }
3041
3042 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
3043 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
3044 return -EINVAL;
3045
3046 flags = 0;
3047 if (nla[NFTA_SET_FLAGS] != NULL) {
3048 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3049 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
3050 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
3051 NFT_SET_MAP | NFT_SET_EVAL |
3052 NFT_SET_OBJECT))
3053 return -EINVAL;
3054 /* Only one of these operations is supported */
3055 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3056 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
3057 return -EOPNOTSUPP;
3058 }
3059
3060 dtype = 0;
3061 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3062 if (!(flags & NFT_SET_MAP))
3063 return -EINVAL;
3064
3065 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3066 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3067 dtype != NFT_DATA_VERDICT)
3068 return -EINVAL;
3069
3070 if (dtype != NFT_DATA_VERDICT) {
3071 if (nla[NFTA_SET_DATA_LEN] == NULL)
3072 return -EINVAL;
3073 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
3074 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
3075 return -EINVAL;
3076 } else
3077 desc.dlen = sizeof(struct nft_verdict);
3078 } else if (flags & NFT_SET_MAP)
3079 return -EINVAL;
3080
3081 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3082 if (!(flags & NFT_SET_OBJECT))
3083 return -EINVAL;
3084
3085 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3086 if (objtype == NFT_OBJECT_UNSPEC ||
3087 objtype > NFT_OBJECT_MAX)
3088 return -EINVAL;
3089 } else if (flags & NFT_SET_OBJECT)
3090 return -EINVAL;
3091 else
3092 objtype = NFT_OBJECT_UNSPEC;
3093
3094 timeout = 0;
3095 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3096 if (!(flags & NFT_SET_TIMEOUT))
3097 return -EINVAL;
3098 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3099 nla[NFTA_SET_TIMEOUT])));
3100 }
3101 gc_int = 0;
3102 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3103 if (!(flags & NFT_SET_TIMEOUT))
3104 return -EINVAL;
3105 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3106 }
3107
3108 policy = NFT_SET_POL_PERFORMANCE;
3109 if (nla[NFTA_SET_POLICY] != NULL)
3110 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3111
3112 if (nla[NFTA_SET_DESC] != NULL) {
3113 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
3114 if (err < 0)
3115 return err;
3116 }
3117
3118 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
3119
3120 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
3121 if (IS_ERR(afi))
3122 return PTR_ERR(afi);
3123
3124 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
3125 if (IS_ERR(table))
3126 return PTR_ERR(table);
3127
3128 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
3129
3130 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
3131 if (IS_ERR(set)) {
3132 if (PTR_ERR(set) != -ENOENT)
3133 return PTR_ERR(set);
3134 } else {
3135 if (nlh->nlmsg_flags & NLM_F_EXCL)
3136 return -EEXIST;
3137 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3138 return -EOPNOTSUPP;
3139 return 0;
3140 }
3141
3142 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3143 return -ENOENT;
3144
3145 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
3146 if (IS_ERR(ops))
3147 return PTR_ERR(ops);
3148
3149 udlen = 0;
3150 if (nla[NFTA_SET_USERDATA])
3151 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3152
3153 size = 0;
3154 if (ops->privsize != NULL)
3155 size = ops->privsize(nla, &desc);
3156
3157 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3158 if (!set) {
3159 err = -ENOMEM;
3160 goto err1;
3161 }
3162
3163 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3164 if (!name) {
3165 err = -ENOMEM;
3166 goto err2;
3167 }
3168
3169 err = nf_tables_set_alloc_name(&ctx, set, name);
3170 kfree(name);
3171 if (err < 0)
3172 goto err2;
3173
3174 udata = NULL;
3175 if (udlen) {
3176 udata = set->data + size;
3177 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3178 }
3179
3180 INIT_LIST_HEAD(&set->bindings);
3181 set->ops = ops;
3182 set->ktype = ktype;
3183 set->klen = desc.klen;
3184 set->dtype = dtype;
3185 set->objtype = objtype;
3186 set->dlen = desc.dlen;
3187 set->flags = flags;
3188 set->size = desc.size;
3189 set->policy = policy;
3190 set->udlen = udlen;
3191 set->udata = udata;
3192 set->timeout = timeout;
3193 set->gc_int = gc_int;
3194
3195 err = ops->init(set, &desc, nla);
3196 if (err < 0)
3197 goto err2;
3198
3199 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3200 if (err < 0)
3201 goto err3;
3202
3203 list_add_tail_rcu(&set->list, &table->sets);
3204 table->use++;
3205 return 0;
3206
3207 err3:
3208 ops->destroy(set);
3209 err2:
3210 kvfree(set);
3211 err1:
3212 module_put(ops->type->owner);
3213 return err;
3214 }
3215
3216 static void nft_set_destroy(struct nft_set *set)
3217 {
3218 set->ops->destroy(set);
3219 module_put(set->ops->type->owner);
3220 kfree(set->name);
3221 kvfree(set);
3222 }
3223
3224 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3225 {
3226 list_del_rcu(&set->list);
3227 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
3228 nft_set_destroy(set);
3229 }
3230
3231 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3232 struct sk_buff *skb, const struct nlmsghdr *nlh,
3233 const struct nlattr * const nla[],
3234 struct netlink_ext_ack *extack)
3235 {
3236 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3237 u8 genmask = nft_genmask_next(net);
3238 struct nft_set *set;
3239 struct nft_ctx ctx;
3240 int err;
3241
3242 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3243 return -EAFNOSUPPORT;
3244 if (nla[NFTA_SET_TABLE] == NULL)
3245 return -EINVAL;
3246
3247 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
3248 if (err < 0)
3249 return err;
3250
3251 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3252 if (IS_ERR(set))
3253 return PTR_ERR(set);
3254
3255 if (!list_empty(&set->bindings) ||
3256 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0))
3257 return -EBUSY;
3258
3259 return nft_delset(&ctx, set);
3260 }
3261
3262 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3263 struct nft_set *set,
3264 const struct nft_set_iter *iter,
3265 struct nft_set_elem *elem)
3266 {
3267 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3268 enum nft_registers dreg;
3269
3270 dreg = nft_type_to_reg(set->dtype);
3271 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3272 set->dtype == NFT_DATA_VERDICT ?
3273 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3274 set->dlen);
3275 }
3276
3277 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3278 struct nft_set_binding *binding)
3279 {
3280 struct nft_set_binding *i;
3281 struct nft_set_iter iter;
3282
3283 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
3284 return -EBUSY;
3285
3286 if (binding->flags & NFT_SET_MAP) {
3287 /* If the set is already bound to the same chain all
3288 * jumps are already validated for that chain.
3289 */
3290 list_for_each_entry(i, &set->bindings, list) {
3291 if (i->flags & NFT_SET_MAP &&
3292 i->chain == binding->chain)
3293 goto bind;
3294 }
3295
3296 iter.genmask = nft_genmask_next(ctx->net);
3297 iter.skip = 0;
3298 iter.count = 0;
3299 iter.err = 0;
3300 iter.fn = nf_tables_bind_check_setelem;
3301
3302 set->ops->walk(ctx, set, &iter);
3303 if (iter.err < 0)
3304 return iter.err;
3305 }
3306 bind:
3307 binding->chain = ctx->chain;
3308 list_add_tail_rcu(&binding->list, &set->bindings);
3309 return 0;
3310 }
3311 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3312
3313 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3314 struct nft_set_binding *binding)
3315 {
3316 list_del_rcu(&binding->list);
3317
3318 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
3319 nft_is_active(ctx->net, set))
3320 nf_tables_set_destroy(ctx, set);
3321 }
3322 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3323
3324 const struct nft_set_ext_type nft_set_ext_types[] = {
3325 [NFT_SET_EXT_KEY] = {
3326 .align = __alignof__(u32),
3327 },
3328 [NFT_SET_EXT_DATA] = {
3329 .align = __alignof__(u32),
3330 },
3331 [NFT_SET_EXT_EXPR] = {
3332 .align = __alignof__(struct nft_expr),
3333 },
3334 [NFT_SET_EXT_OBJREF] = {
3335 .len = sizeof(struct nft_object *),
3336 .align = __alignof__(struct nft_object *),
3337 },
3338 [NFT_SET_EXT_FLAGS] = {
3339 .len = sizeof(u8),
3340 .align = __alignof__(u8),
3341 },
3342 [NFT_SET_EXT_TIMEOUT] = {
3343 .len = sizeof(u64),
3344 .align = __alignof__(u64),
3345 },
3346 [NFT_SET_EXT_EXPIRATION] = {
3347 .len = sizeof(unsigned long),
3348 .align = __alignof__(unsigned long),
3349 },
3350 [NFT_SET_EXT_USERDATA] = {
3351 .len = sizeof(struct nft_userdata),
3352 .align = __alignof__(struct nft_userdata),
3353 },
3354 };
3355 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3356
3357 /*
3358 * Set elements
3359 */
3360
3361 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3362 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3363 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3364 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3365 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3366 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3367 .len = NFT_USERDATA_MAXLEN },
3368 };
3369
3370 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3371 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3372 .len = NFT_TABLE_MAXNAMELEN - 1 },
3373 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3374 .len = NFT_SET_MAXNAMELEN - 1 },
3375 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3376 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3377 };
3378
3379 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3380 const struct sk_buff *skb,
3381 const struct nlmsghdr *nlh,
3382 const struct nlattr * const nla[],
3383 u8 genmask)
3384 {
3385 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3386 struct nft_af_info *afi;
3387 struct nft_table *table;
3388
3389 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3390 if (IS_ERR(afi))
3391 return PTR_ERR(afi);
3392
3393 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3394 genmask);
3395 if (IS_ERR(table))
3396 return PTR_ERR(table);
3397
3398 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
3399 return 0;
3400 }
3401
3402 static int nf_tables_fill_setelem(struct sk_buff *skb,
3403 const struct nft_set *set,
3404 const struct nft_set_elem *elem)
3405 {
3406 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3407 unsigned char *b = skb_tail_pointer(skb);
3408 struct nlattr *nest;
3409
3410 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3411 if (nest == NULL)
3412 goto nla_put_failure;
3413
3414 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3415 NFT_DATA_VALUE, set->klen) < 0)
3416 goto nla_put_failure;
3417
3418 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3419 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3420 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3421 set->dlen) < 0)
3422 goto nla_put_failure;
3423
3424 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3425 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3426 goto nla_put_failure;
3427
3428 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3429 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3430 (*nft_set_ext_obj(ext))->name) < 0)
3431 goto nla_put_failure;
3432
3433 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3434 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3435 htonl(*nft_set_ext_flags(ext))))
3436 goto nla_put_failure;
3437
3438 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3439 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3440 cpu_to_be64(jiffies_to_msecs(
3441 *nft_set_ext_timeout(ext))),
3442 NFTA_SET_ELEM_PAD))
3443 goto nla_put_failure;
3444
3445 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3446 unsigned long expires, now = jiffies;
3447
3448 expires = *nft_set_ext_expiration(ext);
3449 if (time_before(now, expires))
3450 expires -= now;
3451 else
3452 expires = 0;
3453
3454 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3455 cpu_to_be64(jiffies_to_msecs(expires)),
3456 NFTA_SET_ELEM_PAD))
3457 goto nla_put_failure;
3458 }
3459
3460 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3461 struct nft_userdata *udata;
3462
3463 udata = nft_set_ext_userdata(ext);
3464 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3465 udata->len + 1, udata->data))
3466 goto nla_put_failure;
3467 }
3468
3469 nla_nest_end(skb, nest);
3470 return 0;
3471
3472 nla_put_failure:
3473 nlmsg_trim(skb, b);
3474 return -EMSGSIZE;
3475 }
3476
3477 struct nft_set_dump_args {
3478 const struct netlink_callback *cb;
3479 struct nft_set_iter iter;
3480 struct sk_buff *skb;
3481 };
3482
3483 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3484 struct nft_set *set,
3485 const struct nft_set_iter *iter,
3486 struct nft_set_elem *elem)
3487 {
3488 struct nft_set_dump_args *args;
3489
3490 args = container_of(iter, struct nft_set_dump_args, iter);
3491 return nf_tables_fill_setelem(args->skb, set, elem);
3492 }
3493
3494 struct nft_set_dump_ctx {
3495 const struct nft_set *set;
3496 struct nft_ctx ctx;
3497 };
3498
3499 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3500 {
3501 struct nft_set_dump_ctx *dump_ctx = cb->data;
3502 struct net *net = sock_net(skb->sk);
3503 struct nft_af_info *afi;
3504 struct nft_table *table;
3505 struct nft_set *set;
3506 struct nft_set_dump_args args;
3507 bool set_found = false;
3508 struct nfgenmsg *nfmsg;
3509 struct nlmsghdr *nlh;
3510 struct nlattr *nest;
3511 u32 portid, seq;
3512 int event;
3513
3514 rcu_read_lock();
3515 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
3516 if (afi != dump_ctx->ctx.afi)
3517 continue;
3518
3519 list_for_each_entry_rcu(table, &afi->tables, list) {
3520 if (table != dump_ctx->ctx.table)
3521 continue;
3522
3523 list_for_each_entry_rcu(set, &table->sets, list) {
3524 if (set == dump_ctx->set) {
3525 set_found = true;
3526 break;
3527 }
3528 }
3529 break;
3530 }
3531 break;
3532 }
3533
3534 if (!set_found) {
3535 rcu_read_unlock();
3536 return -ENOENT;
3537 }
3538
3539 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
3540 portid = NETLINK_CB(cb->skb).portid;
3541 seq = cb->nlh->nlmsg_seq;
3542
3543 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3544 NLM_F_MULTI);
3545 if (nlh == NULL)
3546 goto nla_put_failure;
3547
3548 nfmsg = nlmsg_data(nlh);
3549 nfmsg->nfgen_family = afi->family;
3550 nfmsg->version = NFNETLINK_V0;
3551 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3552
3553 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
3554 goto nla_put_failure;
3555 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3556 goto nla_put_failure;
3557
3558 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3559 if (nest == NULL)
3560 goto nla_put_failure;
3561
3562 args.cb = cb;
3563 args.skb = skb;
3564 args.iter.genmask = nft_genmask_cur(net);
3565 args.iter.skip = cb->args[0];
3566 args.iter.count = 0;
3567 args.iter.err = 0;
3568 args.iter.fn = nf_tables_dump_setelem;
3569 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
3570 rcu_read_unlock();
3571
3572 nla_nest_end(skb, nest);
3573 nlmsg_end(skb, nlh);
3574
3575 if (args.iter.err && args.iter.err != -EMSGSIZE)
3576 return args.iter.err;
3577 if (args.iter.count == cb->args[0])
3578 return 0;
3579
3580 cb->args[0] = args.iter.count;
3581 return skb->len;
3582
3583 nla_put_failure:
3584 rcu_read_unlock();
3585 return -ENOSPC;
3586 }
3587
3588 static int nf_tables_dump_set_done(struct netlink_callback *cb)
3589 {
3590 kfree(cb->data);
3591 return 0;
3592 }
3593
3594 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3595 struct sk_buff *skb, const struct nlmsghdr *nlh,
3596 const struct nlattr * const nla[],
3597 struct netlink_ext_ack *extack)
3598 {
3599 u8 genmask = nft_genmask_cur(net);
3600 const struct nft_set *set;
3601 struct nft_ctx ctx;
3602 int err;
3603
3604 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3605 if (err < 0)
3606 return err;
3607
3608 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3609 genmask);
3610 if (IS_ERR(set))
3611 return PTR_ERR(set);
3612
3613 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3614 struct netlink_dump_control c = {
3615 .dump = nf_tables_dump_set,
3616 .done = nf_tables_dump_set_done,
3617 };
3618 struct nft_set_dump_ctx *dump_ctx;
3619
3620 dump_ctx = kmalloc(sizeof(*dump_ctx), GFP_KERNEL);
3621 if (!dump_ctx)
3622 return -ENOMEM;
3623
3624 dump_ctx->set = set;
3625 dump_ctx->ctx = ctx;
3626
3627 c.data = dump_ctx;
3628 return netlink_dump_start(nlsk, skb, nlh, &c);
3629 }
3630 return -EOPNOTSUPP;
3631 }
3632
3633 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3634 const struct nft_ctx *ctx, u32 seq,
3635 u32 portid, int event, u16 flags,
3636 const struct nft_set *set,
3637 const struct nft_set_elem *elem)
3638 {
3639 struct nfgenmsg *nfmsg;
3640 struct nlmsghdr *nlh;
3641 struct nlattr *nest;
3642 int err;
3643
3644 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3645 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3646 flags);
3647 if (nlh == NULL)
3648 goto nla_put_failure;
3649
3650 nfmsg = nlmsg_data(nlh);
3651 nfmsg->nfgen_family = ctx->afi->family;
3652 nfmsg->version = NFNETLINK_V0;
3653 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3654
3655 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3656 goto nla_put_failure;
3657 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3658 goto nla_put_failure;
3659
3660 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3661 if (nest == NULL)
3662 goto nla_put_failure;
3663
3664 err = nf_tables_fill_setelem(skb, set, elem);
3665 if (err < 0)
3666 goto nla_put_failure;
3667
3668 nla_nest_end(skb, nest);
3669
3670 nlmsg_end(skb, nlh);
3671 return 0;
3672
3673 nla_put_failure:
3674 nlmsg_trim(skb, nlh);
3675 return -1;
3676 }
3677
3678 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
3679 const struct nft_set *set,
3680 const struct nft_set_elem *elem,
3681 int event, u16 flags)
3682 {
3683 struct net *net = ctx->net;
3684 u32 portid = ctx->portid;
3685 struct sk_buff *skb;
3686 int err;
3687
3688 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3689 return;
3690
3691 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3692 if (skb == NULL)
3693 goto err;
3694
3695 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3696 set, elem);
3697 if (err < 0) {
3698 kfree_skb(skb);
3699 goto err;
3700 }
3701
3702 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3703 GFP_KERNEL);
3704 return;
3705 err:
3706 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3707 }
3708
3709 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3710 int msg_type,
3711 struct nft_set *set)
3712 {
3713 struct nft_trans *trans;
3714
3715 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3716 if (trans == NULL)
3717 return NULL;
3718
3719 nft_trans_elem_set(trans) = set;
3720 return trans;
3721 }
3722
3723 void *nft_set_elem_init(const struct nft_set *set,
3724 const struct nft_set_ext_tmpl *tmpl,
3725 const u32 *key, const u32 *data,
3726 u64 timeout, gfp_t gfp)
3727 {
3728 struct nft_set_ext *ext;
3729 void *elem;
3730
3731 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3732 if (elem == NULL)
3733 return NULL;
3734
3735 ext = nft_set_elem_ext(set, elem);
3736 nft_set_ext_init(ext, tmpl);
3737
3738 memcpy(nft_set_ext_key(ext), key, set->klen);
3739 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3740 memcpy(nft_set_ext_data(ext), data, set->dlen);
3741 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3742 *nft_set_ext_expiration(ext) =
3743 jiffies + timeout;
3744 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3745 *nft_set_ext_timeout(ext) = timeout;
3746
3747 return elem;
3748 }
3749
3750 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
3751 bool destroy_expr)
3752 {
3753 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3754
3755 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
3756 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3757 nft_data_release(nft_set_ext_data(ext), set->dtype);
3758 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3759 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3760 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
3761 (*nft_set_ext_obj(ext))->use--;
3762 kfree(elem);
3763 }
3764 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3765
3766 /* Only called from commit path, nft_set_elem_deactivate() already deals with
3767 * the refcounting from the preparation phase.
3768 */
3769 static void nf_tables_set_elem_destroy(const struct nft_set *set, void *elem)
3770 {
3771 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3772
3773 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3774 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3775 kfree(elem);
3776 }
3777
3778 static int nft_setelem_parse_flags(const struct nft_set *set,
3779 const struct nlattr *attr, u32 *flags)
3780 {
3781 if (attr == NULL)
3782 return 0;
3783
3784 *flags = ntohl(nla_get_be32(attr));
3785 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3786 return -EINVAL;
3787 if (!(set->flags & NFT_SET_INTERVAL) &&
3788 *flags & NFT_SET_ELEM_INTERVAL_END)
3789 return -EINVAL;
3790
3791 return 0;
3792 }
3793
3794 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3795 const struct nlattr *attr, u32 nlmsg_flags)
3796 {
3797 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3798 u8 genmask = nft_genmask_next(ctx->net);
3799 struct nft_data_desc d1, d2;
3800 struct nft_set_ext_tmpl tmpl;
3801 struct nft_set_ext *ext, *ext2;
3802 struct nft_set_elem elem;
3803 struct nft_set_binding *binding;
3804 struct nft_object *obj = NULL;
3805 struct nft_userdata *udata;
3806 struct nft_data data;
3807 enum nft_registers dreg;
3808 struct nft_trans *trans;
3809 u32 flags = 0;
3810 u64 timeout;
3811 u8 ulen;
3812 int err;
3813
3814 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3815 nft_set_elem_policy, NULL);
3816 if (err < 0)
3817 return err;
3818
3819 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3820 return -EINVAL;
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 if (set->flags & NFT_SET_MAP) {
3831 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3832 !(flags & NFT_SET_ELEM_INTERVAL_END))
3833 return -EINVAL;
3834 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3835 flags & NFT_SET_ELEM_INTERVAL_END)
3836 return -EINVAL;
3837 } else {
3838 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3839 return -EINVAL;
3840 }
3841
3842 timeout = 0;
3843 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3844 if (!(set->flags & NFT_SET_TIMEOUT))
3845 return -EINVAL;
3846 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3847 nla[NFTA_SET_ELEM_TIMEOUT])));
3848 } else if (set->flags & NFT_SET_TIMEOUT) {
3849 timeout = set->timeout;
3850 }
3851
3852 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3853 nla[NFTA_SET_ELEM_KEY]);
3854 if (err < 0)
3855 goto err1;
3856 err = -EINVAL;
3857 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3858 goto err2;
3859
3860 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3861 if (timeout > 0) {
3862 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3863 if (timeout != set->timeout)
3864 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3865 }
3866
3867 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
3868 if (!(set->flags & NFT_SET_OBJECT)) {
3869 err = -EINVAL;
3870 goto err2;
3871 }
3872 obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
3873 set->objtype, genmask);
3874 if (IS_ERR(obj)) {
3875 err = PTR_ERR(obj);
3876 goto err2;
3877 }
3878 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
3879 }
3880
3881 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3882 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3883 nla[NFTA_SET_ELEM_DATA]);
3884 if (err < 0)
3885 goto err2;
3886
3887 err = -EINVAL;
3888 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3889 goto err3;
3890
3891 dreg = nft_type_to_reg(set->dtype);
3892 list_for_each_entry(binding, &set->bindings, list) {
3893 struct nft_ctx bind_ctx = {
3894 .net = ctx->net,
3895 .afi = ctx->afi,
3896 .table = ctx->table,
3897 .chain = (struct nft_chain *)binding->chain,
3898 };
3899
3900 if (!(binding->flags & NFT_SET_MAP))
3901 continue;
3902
3903 err = nft_validate_register_store(&bind_ctx, dreg,
3904 &data,
3905 d2.type, d2.len);
3906 if (err < 0)
3907 goto err3;
3908 }
3909
3910 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
3911 }
3912
3913 /* The full maximum length of userdata can exceed the maximum
3914 * offset value (U8_MAX) for following extensions, therefor it
3915 * must be the last extension added.
3916 */
3917 ulen = 0;
3918 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3919 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3920 if (ulen > 0)
3921 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3922 ulen);
3923 }
3924
3925 err = -ENOMEM;
3926 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
3927 timeout, GFP_KERNEL);
3928 if (elem.priv == NULL)
3929 goto err3;
3930
3931 ext = nft_set_elem_ext(set, elem.priv);
3932 if (flags)
3933 *nft_set_ext_flags(ext) = flags;
3934 if (ulen > 0) {
3935 udata = nft_set_ext_userdata(ext);
3936 udata->len = ulen - 1;
3937 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3938 }
3939 if (obj) {
3940 *nft_set_ext_obj(ext) = obj;
3941 obj->use++;
3942 }
3943
3944 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3945 if (trans == NULL)
3946 goto err4;
3947
3948 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
3949 err = set->ops->insert(ctx->net, set, &elem, &ext2);
3950 if (err) {
3951 if (err == -EEXIST) {
3952 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
3953 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
3954 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
3955 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
3956 return -EBUSY;
3957 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3958 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
3959 memcmp(nft_set_ext_data(ext),
3960 nft_set_ext_data(ext2), set->dlen) != 0) ||
3961 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3962 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
3963 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
3964 err = -EBUSY;
3965 else if (!(nlmsg_flags & NLM_F_EXCL))
3966 err = 0;
3967 }
3968 goto err5;
3969 }
3970
3971 if (set->size &&
3972 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
3973 err = -ENFILE;
3974 goto err6;
3975 }
3976
3977 nft_trans_elem(trans) = elem;
3978 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3979 return 0;
3980
3981 err6:
3982 set->ops->remove(ctx->net, set, &elem);
3983 err5:
3984 kfree(trans);
3985 err4:
3986 kfree(elem.priv);
3987 err3:
3988 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3989 nft_data_release(&data, d2.type);
3990 err2:
3991 nft_data_release(&elem.key.val, d1.type);
3992 err1:
3993 return err;
3994 }
3995
3996 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3997 struct sk_buff *skb, const struct nlmsghdr *nlh,
3998 const struct nlattr * const nla[],
3999 struct netlink_ext_ack *extack)
4000 {
4001 u8 genmask = nft_genmask_next(net);
4002 const struct nlattr *attr;
4003 struct nft_set *set;
4004 struct nft_ctx ctx;
4005 int rem, err = 0;
4006
4007 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
4008 return -EINVAL;
4009
4010 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
4011 if (err < 0)
4012 return err;
4013
4014 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4015 genmask);
4016 if (IS_ERR(set)) {
4017 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
4018 set = nf_tables_set_lookup_byid(net,
4019 nla[NFTA_SET_ELEM_LIST_SET_ID],
4020 genmask);
4021 }
4022 if (IS_ERR(set))
4023 return PTR_ERR(set);
4024 }
4025
4026 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4027 return -EBUSY;
4028
4029 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4030 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
4031 if (err < 0)
4032 break;
4033 }
4034 return err;
4035 }
4036
4037 /**
4038 * nft_data_hold - hold a nft_data item
4039 *
4040 * @data: struct nft_data to release
4041 * @type: type of data
4042 *
4043 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4044 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
4045 * NFT_GOTO verdicts. This function must be called on active data objects
4046 * from the second phase of the commit protocol.
4047 */
4048 static void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
4049 {
4050 if (type == NFT_DATA_VERDICT) {
4051 switch (data->verdict.code) {
4052 case NFT_JUMP:
4053 case NFT_GOTO:
4054 data->verdict.chain->use++;
4055 break;
4056 }
4057 }
4058 }
4059
4060 static void nft_set_elem_activate(const struct net *net,
4061 const struct nft_set *set,
4062 struct nft_set_elem *elem)
4063 {
4064 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4065
4066 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4067 nft_data_hold(nft_set_ext_data(ext), set->dtype);
4068 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4069 (*nft_set_ext_obj(ext))->use++;
4070 }
4071
4072 static void nft_set_elem_deactivate(const struct net *net,
4073 const struct nft_set *set,
4074 struct nft_set_elem *elem)
4075 {
4076 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4077
4078 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4079 nft_data_release(nft_set_ext_data(ext), set->dtype);
4080 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4081 (*nft_set_ext_obj(ext))->use--;
4082 }
4083
4084 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
4085 const struct nlattr *attr)
4086 {
4087 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4088 struct nft_set_ext_tmpl tmpl;
4089 struct nft_data_desc desc;
4090 struct nft_set_elem elem;
4091 struct nft_set_ext *ext;
4092 struct nft_trans *trans;
4093 u32 flags = 0;
4094 void *priv;
4095 int err;
4096
4097 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4098 nft_set_elem_policy, NULL);
4099 if (err < 0)
4100 goto err1;
4101
4102 err = -EINVAL;
4103 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4104 goto err1;
4105
4106 nft_set_ext_prepare(&tmpl);
4107
4108 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4109 if (err < 0)
4110 return err;
4111 if (flags != 0)
4112 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4113
4114 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4115 nla[NFTA_SET_ELEM_KEY]);
4116 if (err < 0)
4117 goto err1;
4118
4119 err = -EINVAL;
4120 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4121 goto err2;
4122
4123 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
4124
4125 err = -ENOMEM;
4126 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
4127 GFP_KERNEL);
4128 if (elem.priv == NULL)
4129 goto err2;
4130
4131 ext = nft_set_elem_ext(set, elem.priv);
4132 if (flags)
4133 *nft_set_ext_flags(ext) = flags;
4134
4135 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
4136 if (trans == NULL) {
4137 err = -ENOMEM;
4138 goto err3;
4139 }
4140
4141 priv = set->ops->deactivate(ctx->net, set, &elem);
4142 if (priv == NULL) {
4143 err = -ENOENT;
4144 goto err4;
4145 }
4146 kfree(elem.priv);
4147 elem.priv = priv;
4148
4149 nft_set_elem_deactivate(ctx->net, set, &elem);
4150
4151 nft_trans_elem(trans) = elem;
4152 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4153 return 0;
4154
4155 err4:
4156 kfree(trans);
4157 err3:
4158 kfree(elem.priv);
4159 err2:
4160 nft_data_release(&elem.key.val, desc.type);
4161 err1:
4162 return err;
4163 }
4164
4165 static int nft_flush_set(const struct nft_ctx *ctx,
4166 struct nft_set *set,
4167 const struct nft_set_iter *iter,
4168 struct nft_set_elem *elem)
4169 {
4170 struct nft_trans *trans;
4171 int err;
4172
4173 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
4174 sizeof(struct nft_trans_elem), GFP_ATOMIC);
4175 if (!trans)
4176 return -ENOMEM;
4177
4178 if (!set->ops->flush(ctx->net, set, elem->priv)) {
4179 err = -ENOENT;
4180 goto err1;
4181 }
4182 set->ndeact++;
4183
4184 nft_trans_elem_set(trans) = set;
4185 nft_trans_elem(trans) = *elem;
4186 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4187
4188 return 0;
4189 err1:
4190 kfree(trans);
4191 return err;
4192 }
4193
4194 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
4195 struct sk_buff *skb, const struct nlmsghdr *nlh,
4196 const struct nlattr * const nla[],
4197 struct netlink_ext_ack *extack)
4198 {
4199 u8 genmask = nft_genmask_next(net);
4200 const struct nlattr *attr;
4201 struct nft_set *set;
4202 struct nft_ctx ctx;
4203 int rem, err = 0;
4204
4205 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
4206 if (err < 0)
4207 return err;
4208
4209 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4210 genmask);
4211 if (IS_ERR(set))
4212 return PTR_ERR(set);
4213 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4214 return -EBUSY;
4215
4216 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
4217 struct nft_set_iter iter = {
4218 .genmask = genmask,
4219 .fn = nft_flush_set,
4220 };
4221 set->ops->walk(&ctx, set, &iter);
4222
4223 return iter.err;
4224 }
4225
4226 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4227 err = nft_del_setelem(&ctx, set, attr);
4228 if (err < 0)
4229 break;
4230
4231 set->ndeact++;
4232 }
4233 return err;
4234 }
4235
4236 void nft_set_gc_batch_release(struct rcu_head *rcu)
4237 {
4238 struct nft_set_gc_batch *gcb;
4239 unsigned int i;
4240
4241 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4242 for (i = 0; i < gcb->head.cnt; i++)
4243 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
4244 kfree(gcb);
4245 }
4246 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4247
4248 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4249 gfp_t gfp)
4250 {
4251 struct nft_set_gc_batch *gcb;
4252
4253 gcb = kzalloc(sizeof(*gcb), gfp);
4254 if (gcb == NULL)
4255 return gcb;
4256 gcb->head.set = set;
4257 return gcb;
4258 }
4259 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4260
4261 /*
4262 * Stateful objects
4263 */
4264
4265 /**
4266 * nft_register_obj- register nf_tables stateful object type
4267 * @obj: object type
4268 *
4269 * Registers the object type for use with nf_tables. Returns zero on
4270 * success or a negative errno code otherwise.
4271 */
4272 int nft_register_obj(struct nft_object_type *obj_type)
4273 {
4274 if (obj_type->type == NFT_OBJECT_UNSPEC)
4275 return -EINVAL;
4276
4277 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4278 list_add_rcu(&obj_type->list, &nf_tables_objects);
4279 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4280 return 0;
4281 }
4282 EXPORT_SYMBOL_GPL(nft_register_obj);
4283
4284 /**
4285 * nft_unregister_obj - unregister nf_tables object type
4286 * @obj: object type
4287 *
4288 * Unregisters the object type for use with nf_tables.
4289 */
4290 void nft_unregister_obj(struct nft_object_type *obj_type)
4291 {
4292 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4293 list_del_rcu(&obj_type->list);
4294 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4295 }
4296 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4297
4298 struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
4299 const struct nlattr *nla,
4300 u32 objtype, u8 genmask)
4301 {
4302 struct nft_object *obj;
4303
4304 list_for_each_entry(obj, &table->objects, list) {
4305 if (!nla_strcmp(nla, obj->name) &&
4306 objtype == obj->ops->type->type &&
4307 nft_active_genmask(obj, genmask))
4308 return obj;
4309 }
4310 return ERR_PTR(-ENOENT);
4311 }
4312 EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
4313
4314 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4315 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4316 .len = NFT_TABLE_MAXNAMELEN - 1 },
4317 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4318 .len = NFT_OBJ_MAXNAMELEN - 1 },
4319 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4320 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4321 };
4322
4323 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4324 const struct nft_object_type *type,
4325 const struct nlattr *attr)
4326 {
4327 struct nlattr *tb[type->maxattr + 1];
4328 const struct nft_object_ops *ops;
4329 struct nft_object *obj;
4330 int err;
4331
4332 if (attr) {
4333 err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
4334 NULL);
4335 if (err < 0)
4336 goto err1;
4337 } else {
4338 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4339 }
4340
4341 if (type->select_ops) {
4342 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
4343 if (IS_ERR(ops)) {
4344 err = PTR_ERR(ops);
4345 goto err1;
4346 }
4347 } else {
4348 ops = type->ops;
4349 }
4350
4351 err = -ENOMEM;
4352 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
4353 if (obj == NULL)
4354 goto err1;
4355
4356 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
4357 if (err < 0)
4358 goto err2;
4359
4360 obj->ops = ops;
4361
4362 return obj;
4363 err2:
4364 kfree(obj);
4365 err1:
4366 return ERR_PTR(err);
4367 }
4368
4369 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
4370 struct nft_object *obj, bool reset)
4371 {
4372 struct nlattr *nest;
4373
4374 nest = nla_nest_start(skb, attr);
4375 if (!nest)
4376 goto nla_put_failure;
4377 if (obj->ops->dump(skb, obj, reset) < 0)
4378 goto nla_put_failure;
4379 nla_nest_end(skb, nest);
4380 return 0;
4381
4382 nla_put_failure:
4383 return -1;
4384 }
4385
4386 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4387 {
4388 const struct nft_object_type *type;
4389
4390 list_for_each_entry(type, &nf_tables_objects, list) {
4391 if (objtype == type->type)
4392 return type;
4393 }
4394 return NULL;
4395 }
4396
4397 static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4398 {
4399 const struct nft_object_type *type;
4400
4401 type = __nft_obj_type_get(objtype);
4402 if (type != NULL && try_module_get(type->owner))
4403 return type;
4404
4405 #ifdef CONFIG_MODULES
4406 if (type == NULL) {
4407 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4408 request_module("nft-obj-%u", objtype);
4409 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4410 if (__nft_obj_type_get(objtype))
4411 return ERR_PTR(-EAGAIN);
4412 }
4413 #endif
4414 return ERR_PTR(-ENOENT);
4415 }
4416
4417 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4418 struct sk_buff *skb, const struct nlmsghdr *nlh,
4419 const struct nlattr * const nla[],
4420 struct netlink_ext_ack *extack)
4421 {
4422 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4423 const struct nft_object_type *type;
4424 u8 genmask = nft_genmask_next(net);
4425 int family = nfmsg->nfgen_family;
4426 struct nft_af_info *afi;
4427 struct nft_table *table;
4428 struct nft_object *obj;
4429 struct nft_ctx ctx;
4430 u32 objtype;
4431 int err;
4432
4433 if (!nla[NFTA_OBJ_TYPE] ||
4434 !nla[NFTA_OBJ_NAME] ||
4435 !nla[NFTA_OBJ_DATA])
4436 return -EINVAL;
4437
4438 afi = nf_tables_afinfo_lookup(net, family, true);
4439 if (IS_ERR(afi))
4440 return PTR_ERR(afi);
4441
4442 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4443 if (IS_ERR(table))
4444 return PTR_ERR(table);
4445
4446 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4447 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4448 if (IS_ERR(obj)) {
4449 err = PTR_ERR(obj);
4450 if (err != -ENOENT)
4451 return err;
4452
4453 } else {
4454 if (nlh->nlmsg_flags & NLM_F_EXCL)
4455 return -EEXIST;
4456
4457 return 0;
4458 }
4459
4460 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4461
4462 type = nft_obj_type_get(objtype);
4463 if (IS_ERR(type))
4464 return PTR_ERR(type);
4465
4466 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
4467 if (IS_ERR(obj)) {
4468 err = PTR_ERR(obj);
4469 goto err1;
4470 }
4471 obj->table = table;
4472 obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
4473 if (!obj->name) {
4474 err = -ENOMEM;
4475 goto err2;
4476 }
4477
4478 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4479 if (err < 0)
4480 goto err3;
4481
4482 list_add_tail_rcu(&obj->list, &table->objects);
4483 table->use++;
4484 return 0;
4485 err3:
4486 kfree(obj->name);
4487 err2:
4488 if (obj->ops->destroy)
4489 obj->ops->destroy(obj);
4490 kfree(obj);
4491 err1:
4492 module_put(type->owner);
4493 return err;
4494 }
4495
4496 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4497 u32 portid, u32 seq, int event, u32 flags,
4498 int family, const struct nft_table *table,
4499 struct nft_object *obj, bool reset)
4500 {
4501 struct nfgenmsg *nfmsg;
4502 struct nlmsghdr *nlh;
4503
4504 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4505 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4506 if (nlh == NULL)
4507 goto nla_put_failure;
4508
4509 nfmsg = nlmsg_data(nlh);
4510 nfmsg->nfgen_family = family;
4511 nfmsg->version = NFNETLINK_V0;
4512 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4513
4514 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4515 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
4516 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
4517 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
4518 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
4519 goto nla_put_failure;
4520
4521 nlmsg_end(skb, nlh);
4522 return 0;
4523
4524 nla_put_failure:
4525 nlmsg_trim(skb, nlh);
4526 return -1;
4527 }
4528
4529 struct nft_obj_filter {
4530 char *table;
4531 u32 type;
4532 };
4533
4534 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4535 {
4536 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4537 const struct nft_af_info *afi;
4538 const struct nft_table *table;
4539 unsigned int idx = 0, s_idx = cb->args[0];
4540 struct nft_obj_filter *filter = cb->data;
4541 struct net *net = sock_net(skb->sk);
4542 int family = nfmsg->nfgen_family;
4543 struct nft_object *obj;
4544 bool reset = false;
4545
4546 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4547 reset = true;
4548
4549 rcu_read_lock();
4550 cb->seq = net->nft.base_seq;
4551
4552 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
4553 if (family != NFPROTO_UNSPEC && family != afi->family)
4554 continue;
4555
4556 list_for_each_entry_rcu(table, &afi->tables, list) {
4557 list_for_each_entry_rcu(obj, &table->objects, list) {
4558 if (!nft_is_active(net, obj))
4559 goto cont;
4560 if (idx < s_idx)
4561 goto cont;
4562 if (idx > s_idx)
4563 memset(&cb->args[1], 0,
4564 sizeof(cb->args) - sizeof(cb->args[0]));
4565 if (filter && filter->table[0] &&
4566 strcmp(filter->table, table->name))
4567 goto cont;
4568 if (filter &&
4569 filter->type != NFT_OBJECT_UNSPEC &&
4570 obj->ops->type->type != filter->type)
4571 goto cont;
4572
4573 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4574 cb->nlh->nlmsg_seq,
4575 NFT_MSG_NEWOBJ,
4576 NLM_F_MULTI | NLM_F_APPEND,
4577 afi->family, table, obj, reset) < 0)
4578 goto done;
4579
4580 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4581 cont:
4582 idx++;
4583 }
4584 }
4585 }
4586 done:
4587 rcu_read_unlock();
4588
4589 cb->args[0] = idx;
4590 return skb->len;
4591 }
4592
4593 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4594 {
4595 struct nft_obj_filter *filter = cb->data;
4596
4597 kfree(filter->table);
4598 kfree(filter);
4599
4600 return 0;
4601 }
4602
4603 static struct nft_obj_filter *
4604 nft_obj_filter_alloc(const struct nlattr * const nla[])
4605 {
4606 struct nft_obj_filter *filter;
4607
4608 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
4609 if (!filter)
4610 return ERR_PTR(-ENOMEM);
4611
4612 if (nla[NFTA_OBJ_TABLE]) {
4613 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_KERNEL);
4614 if (!filter->table) {
4615 kfree(filter);
4616 return ERR_PTR(-ENOMEM);
4617 }
4618 }
4619 if (nla[NFTA_OBJ_TYPE])
4620 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4621
4622 return filter;
4623 }
4624
4625 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
4626 struct sk_buff *skb, const struct nlmsghdr *nlh,
4627 const struct nlattr * const nla[],
4628 struct netlink_ext_ack *extack)
4629 {
4630 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4631 u8 genmask = nft_genmask_cur(net);
4632 int family = nfmsg->nfgen_family;
4633 const struct nft_af_info *afi;
4634 const struct nft_table *table;
4635 struct nft_object *obj;
4636 struct sk_buff *skb2;
4637 bool reset = false;
4638 u32 objtype;
4639 int err;
4640
4641 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4642 struct netlink_dump_control c = {
4643 .dump = nf_tables_dump_obj,
4644 .done = nf_tables_dump_obj_done,
4645 };
4646
4647 if (nla[NFTA_OBJ_TABLE] ||
4648 nla[NFTA_OBJ_TYPE]) {
4649 struct nft_obj_filter *filter;
4650
4651 filter = nft_obj_filter_alloc(nla);
4652 if (IS_ERR(filter))
4653 return -ENOMEM;
4654
4655 c.data = filter;
4656 }
4657 return netlink_dump_start(nlsk, skb, nlh, &c);
4658 }
4659
4660 if (!nla[NFTA_OBJ_NAME] ||
4661 !nla[NFTA_OBJ_TYPE])
4662 return -EINVAL;
4663
4664 afi = nf_tables_afinfo_lookup(net, family, false);
4665 if (IS_ERR(afi))
4666 return PTR_ERR(afi);
4667
4668 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4669 if (IS_ERR(table))
4670 return PTR_ERR(table);
4671
4672 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4673 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4674 if (IS_ERR(obj))
4675 return PTR_ERR(obj);
4676
4677 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4678 if (!skb2)
4679 return -ENOMEM;
4680
4681 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4682 reset = true;
4683
4684 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
4685 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
4686 family, table, obj, reset);
4687 if (err < 0)
4688 goto err;
4689
4690 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4691 err:
4692 kfree_skb(skb2);
4693 return err;
4694 }
4695
4696 static void nft_obj_destroy(struct nft_object *obj)
4697 {
4698 if (obj->ops->destroy)
4699 obj->ops->destroy(obj);
4700
4701 module_put(obj->ops->type->owner);
4702 kfree(obj->name);
4703 kfree(obj);
4704 }
4705
4706 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
4707 struct sk_buff *skb, const struct nlmsghdr *nlh,
4708 const struct nlattr * const nla[],
4709 struct netlink_ext_ack *extack)
4710 {
4711 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4712 u8 genmask = nft_genmask_next(net);
4713 int family = nfmsg->nfgen_family;
4714 struct nft_af_info *afi;
4715 struct nft_table *table;
4716 struct nft_object *obj;
4717 struct nft_ctx ctx;
4718 u32 objtype;
4719
4720 if (!nla[NFTA_OBJ_TYPE] ||
4721 !nla[NFTA_OBJ_NAME])
4722 return -EINVAL;
4723
4724 afi = nf_tables_afinfo_lookup(net, family, true);
4725 if (IS_ERR(afi))
4726 return PTR_ERR(afi);
4727
4728 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4729 if (IS_ERR(table))
4730 return PTR_ERR(table);
4731
4732 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4733 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4734 if (IS_ERR(obj))
4735 return PTR_ERR(obj);
4736 if (obj->use > 0)
4737 return -EBUSY;
4738
4739 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4740
4741 return nft_delobj(&ctx, obj);
4742 }
4743
4744 void nft_obj_notify(struct net *net, struct nft_table *table,
4745 struct nft_object *obj, u32 portid, u32 seq, int event,
4746 int family, int report, gfp_t gfp)
4747 {
4748 struct sk_buff *skb;
4749 int err;
4750
4751 if (!report &&
4752 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4753 return;
4754
4755 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
4756 if (skb == NULL)
4757 goto err;
4758
4759 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
4760 table, obj, false);
4761 if (err < 0) {
4762 kfree_skb(skb);
4763 goto err;
4764 }
4765
4766 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
4767 return;
4768 err:
4769 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4770 }
4771 EXPORT_SYMBOL_GPL(nft_obj_notify);
4772
4773 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
4774 struct nft_object *obj, int event)
4775 {
4776 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
4777 ctx->afi->family, ctx->report, GFP_KERNEL);
4778 }
4779
4780 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
4781 u32 portid, u32 seq)
4782 {
4783 struct nlmsghdr *nlh;
4784 struct nfgenmsg *nfmsg;
4785 char buf[TASK_COMM_LEN];
4786 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
4787
4788 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
4789 if (nlh == NULL)
4790 goto nla_put_failure;
4791
4792 nfmsg = nlmsg_data(nlh);
4793 nfmsg->nfgen_family = AF_UNSPEC;
4794 nfmsg->version = NFNETLINK_V0;
4795 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4796
4797 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
4798 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
4799 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
4800 goto nla_put_failure;
4801
4802 nlmsg_end(skb, nlh);
4803 return 0;
4804
4805 nla_put_failure:
4806 nlmsg_trim(skb, nlh);
4807 return -EMSGSIZE;
4808 }
4809
4810 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
4811 int event)
4812 {
4813 struct nlmsghdr *nlh = nlmsg_hdr(skb);
4814 struct sk_buff *skb2;
4815 int err;
4816
4817 if (nlmsg_report(nlh) &&
4818 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4819 return;
4820
4821 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4822 if (skb2 == NULL)
4823 goto err;
4824
4825 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4826 nlh->nlmsg_seq);
4827 if (err < 0) {
4828 kfree_skb(skb2);
4829 goto err;
4830 }
4831
4832 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4833 nlmsg_report(nlh), GFP_KERNEL);
4834 return;
4835 err:
4836 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4837 -ENOBUFS);
4838 }
4839
4840 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
4841 struct sk_buff *skb, const struct nlmsghdr *nlh,
4842 const struct nlattr * const nla[],
4843 struct netlink_ext_ack *extack)
4844 {
4845 struct sk_buff *skb2;
4846 int err;
4847
4848 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4849 if (skb2 == NULL)
4850 return -ENOMEM;
4851
4852 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4853 nlh->nlmsg_seq);
4854 if (err < 0)
4855 goto err;
4856
4857 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4858 err:
4859 kfree_skb(skb2);
4860 return err;
4861 }
4862
4863 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
4864 [NFT_MSG_NEWTABLE] = {
4865 .call_batch = nf_tables_newtable,
4866 .attr_count = NFTA_TABLE_MAX,
4867 .policy = nft_table_policy,
4868 },
4869 [NFT_MSG_GETTABLE] = {
4870 .call = nf_tables_gettable,
4871 .attr_count = NFTA_TABLE_MAX,
4872 .policy = nft_table_policy,
4873 },
4874 [NFT_MSG_DELTABLE] = {
4875 .call_batch = nf_tables_deltable,
4876 .attr_count = NFTA_TABLE_MAX,
4877 .policy = nft_table_policy,
4878 },
4879 [NFT_MSG_NEWCHAIN] = {
4880 .call_batch = nf_tables_newchain,
4881 .attr_count = NFTA_CHAIN_MAX,
4882 .policy = nft_chain_policy,
4883 },
4884 [NFT_MSG_GETCHAIN] = {
4885 .call = nf_tables_getchain,
4886 .attr_count = NFTA_CHAIN_MAX,
4887 .policy = nft_chain_policy,
4888 },
4889 [NFT_MSG_DELCHAIN] = {
4890 .call_batch = nf_tables_delchain,
4891 .attr_count = NFTA_CHAIN_MAX,
4892 .policy = nft_chain_policy,
4893 },
4894 [NFT_MSG_NEWRULE] = {
4895 .call_batch = nf_tables_newrule,
4896 .attr_count = NFTA_RULE_MAX,
4897 .policy = nft_rule_policy,
4898 },
4899 [NFT_MSG_GETRULE] = {
4900 .call = nf_tables_getrule,
4901 .attr_count = NFTA_RULE_MAX,
4902 .policy = nft_rule_policy,
4903 },
4904 [NFT_MSG_DELRULE] = {
4905 .call_batch = nf_tables_delrule,
4906 .attr_count = NFTA_RULE_MAX,
4907 .policy = nft_rule_policy,
4908 },
4909 [NFT_MSG_NEWSET] = {
4910 .call_batch = nf_tables_newset,
4911 .attr_count = NFTA_SET_MAX,
4912 .policy = nft_set_policy,
4913 },
4914 [NFT_MSG_GETSET] = {
4915 .call = nf_tables_getset,
4916 .attr_count = NFTA_SET_MAX,
4917 .policy = nft_set_policy,
4918 },
4919 [NFT_MSG_DELSET] = {
4920 .call_batch = nf_tables_delset,
4921 .attr_count = NFTA_SET_MAX,
4922 .policy = nft_set_policy,
4923 },
4924 [NFT_MSG_NEWSETELEM] = {
4925 .call_batch = nf_tables_newsetelem,
4926 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4927 .policy = nft_set_elem_list_policy,
4928 },
4929 [NFT_MSG_GETSETELEM] = {
4930 .call = nf_tables_getsetelem,
4931 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4932 .policy = nft_set_elem_list_policy,
4933 },
4934 [NFT_MSG_DELSETELEM] = {
4935 .call_batch = nf_tables_delsetelem,
4936 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4937 .policy = nft_set_elem_list_policy,
4938 },
4939 [NFT_MSG_GETGEN] = {
4940 .call = nf_tables_getgen,
4941 },
4942 [NFT_MSG_NEWOBJ] = {
4943 .call_batch = nf_tables_newobj,
4944 .attr_count = NFTA_OBJ_MAX,
4945 .policy = nft_obj_policy,
4946 },
4947 [NFT_MSG_GETOBJ] = {
4948 .call = nf_tables_getobj,
4949 .attr_count = NFTA_OBJ_MAX,
4950 .policy = nft_obj_policy,
4951 },
4952 [NFT_MSG_DELOBJ] = {
4953 .call_batch = nf_tables_delobj,
4954 .attr_count = NFTA_OBJ_MAX,
4955 .policy = nft_obj_policy,
4956 },
4957 [NFT_MSG_GETOBJ_RESET] = {
4958 .call = nf_tables_getobj,
4959 .attr_count = NFTA_OBJ_MAX,
4960 .policy = nft_obj_policy,
4961 },
4962 };
4963
4964 static void nft_chain_commit_update(struct nft_trans *trans)
4965 {
4966 struct nft_base_chain *basechain;
4967
4968 if (nft_trans_chain_name(trans))
4969 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
4970
4971 if (!nft_is_base_chain(trans->ctx.chain))
4972 return;
4973
4974 basechain = nft_base_chain(trans->ctx.chain);
4975 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
4976
4977 switch (nft_trans_chain_policy(trans)) {
4978 case NF_DROP:
4979 case NF_ACCEPT:
4980 basechain->policy = nft_trans_chain_policy(trans);
4981 break;
4982 }
4983 }
4984
4985 static void nf_tables_commit_release(struct nft_trans *trans)
4986 {
4987 switch (trans->msg_type) {
4988 case NFT_MSG_DELTABLE:
4989 nf_tables_table_destroy(&trans->ctx);
4990 break;
4991 case NFT_MSG_DELCHAIN:
4992 nf_tables_chain_destroy(trans->ctx.chain);
4993 break;
4994 case NFT_MSG_DELRULE:
4995 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4996 break;
4997 case NFT_MSG_DELSET:
4998 nft_set_destroy(nft_trans_set(trans));
4999 break;
5000 case NFT_MSG_DELSETELEM:
5001 nf_tables_set_elem_destroy(nft_trans_elem_set(trans),
5002 nft_trans_elem(trans).priv);
5003 break;
5004 case NFT_MSG_DELOBJ:
5005 nft_obj_destroy(nft_trans_obj(trans));
5006 break;
5007 }
5008 kfree(trans);
5009 }
5010
5011 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
5012 {
5013 struct nft_trans *trans, *next;
5014 struct nft_trans_elem *te;
5015
5016 /* Bump generation counter, invalidate any dump in progress */
5017 while (++net->nft.base_seq == 0);
5018
5019 /* A new generation has just started */
5020 net->nft.gencursor = nft_gencursor_next(net);
5021
5022 /* Make sure all packets have left the previous generation before
5023 * purging old rules.
5024 */
5025 synchronize_rcu();
5026
5027 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
5028 switch (trans->msg_type) {
5029 case NFT_MSG_NEWTABLE:
5030 if (nft_trans_table_update(trans)) {
5031 if (!nft_trans_table_enable(trans)) {
5032 nf_tables_table_disable(net,
5033 trans->ctx.afi,
5034 trans->ctx.table);
5035 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
5036 }
5037 } else {
5038 nft_clear(net, trans->ctx.table);
5039 }
5040 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
5041 nft_trans_destroy(trans);
5042 break;
5043 case NFT_MSG_DELTABLE:
5044 list_del_rcu(&trans->ctx.table->list);
5045 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
5046 break;
5047 case NFT_MSG_NEWCHAIN:
5048 if (nft_trans_chain_update(trans))
5049 nft_chain_commit_update(trans);
5050 else
5051 nft_clear(net, trans->ctx.chain);
5052
5053 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
5054 nft_trans_destroy(trans);
5055 break;
5056 case NFT_MSG_DELCHAIN:
5057 list_del_rcu(&trans->ctx.chain->list);
5058 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
5059 nf_tables_unregister_hooks(trans->ctx.net,
5060 trans->ctx.table,
5061 trans->ctx.chain,
5062 trans->ctx.afi->nops);
5063 break;
5064 case NFT_MSG_NEWRULE:
5065 nft_clear(trans->ctx.net, nft_trans_rule(trans));
5066 nf_tables_rule_notify(&trans->ctx,
5067 nft_trans_rule(trans),
5068 NFT_MSG_NEWRULE);
5069 nft_trans_destroy(trans);
5070 break;
5071 case NFT_MSG_DELRULE:
5072 list_del_rcu(&nft_trans_rule(trans)->list);
5073 nf_tables_rule_notify(&trans->ctx,
5074 nft_trans_rule(trans),
5075 NFT_MSG_DELRULE);
5076 break;
5077 case NFT_MSG_NEWSET:
5078 nft_clear(net, nft_trans_set(trans));
5079 /* This avoids hitting -EBUSY when deleting the table
5080 * from the transaction.
5081 */
5082 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
5083 !list_empty(&nft_trans_set(trans)->bindings))
5084 trans->ctx.table->use--;
5085
5086 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
5087 NFT_MSG_NEWSET, GFP_KERNEL);
5088 nft_trans_destroy(trans);
5089 break;
5090 case NFT_MSG_DELSET:
5091 list_del_rcu(&nft_trans_set(trans)->list);
5092 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
5093 NFT_MSG_DELSET, GFP_KERNEL);
5094 break;
5095 case NFT_MSG_NEWSETELEM:
5096 te = (struct nft_trans_elem *)trans->data;
5097
5098 te->set->ops->activate(net, te->set, &te->elem);
5099 nf_tables_setelem_notify(&trans->ctx, te->set,
5100 &te->elem,
5101 NFT_MSG_NEWSETELEM, 0);
5102 nft_trans_destroy(trans);
5103 break;
5104 case NFT_MSG_DELSETELEM:
5105 te = (struct nft_trans_elem *)trans->data;
5106
5107 nf_tables_setelem_notify(&trans->ctx, te->set,
5108 &te->elem,
5109 NFT_MSG_DELSETELEM, 0);
5110 te->set->ops->remove(net, te->set, &te->elem);
5111 atomic_dec(&te->set->nelems);
5112 te->set->ndeact--;
5113 break;
5114 case NFT_MSG_NEWOBJ:
5115 nft_clear(net, nft_trans_obj(trans));
5116 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
5117 NFT_MSG_NEWOBJ);
5118 nft_trans_destroy(trans);
5119 break;
5120 case NFT_MSG_DELOBJ:
5121 list_del_rcu(&nft_trans_obj(trans)->list);
5122 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
5123 NFT_MSG_DELOBJ);
5124 break;
5125 }
5126 }
5127
5128 synchronize_rcu();
5129
5130 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
5131 list_del(&trans->list);
5132 nf_tables_commit_release(trans);
5133 }
5134
5135 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
5136
5137 return 0;
5138 }
5139
5140 static void nf_tables_abort_release(struct nft_trans *trans)
5141 {
5142 switch (trans->msg_type) {
5143 case NFT_MSG_NEWTABLE:
5144 nf_tables_table_destroy(&trans->ctx);
5145 break;
5146 case NFT_MSG_NEWCHAIN:
5147 nf_tables_chain_destroy(trans->ctx.chain);
5148 break;
5149 case NFT_MSG_NEWRULE:
5150 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
5151 break;
5152 case NFT_MSG_NEWSET:
5153 nft_set_destroy(nft_trans_set(trans));
5154 break;
5155 case NFT_MSG_NEWSETELEM:
5156 nft_set_elem_destroy(nft_trans_elem_set(trans),
5157 nft_trans_elem(trans).priv, true);
5158 break;
5159 case NFT_MSG_NEWOBJ:
5160 nft_obj_destroy(nft_trans_obj(trans));
5161 break;
5162 }
5163 kfree(trans);
5164 }
5165
5166 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
5167 {
5168 struct nft_trans *trans, *next;
5169 struct nft_trans_elem *te;
5170
5171 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
5172 list) {
5173 switch (trans->msg_type) {
5174 case NFT_MSG_NEWTABLE:
5175 if (nft_trans_table_update(trans)) {
5176 if (nft_trans_table_enable(trans)) {
5177 nf_tables_table_disable(net,
5178 trans->ctx.afi,
5179 trans->ctx.table);
5180 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
5181 }
5182 nft_trans_destroy(trans);
5183 } else {
5184 list_del_rcu(&trans->ctx.table->list);
5185 }
5186 break;
5187 case NFT_MSG_DELTABLE:
5188 nft_clear(trans->ctx.net, trans->ctx.table);
5189 nft_trans_destroy(trans);
5190 break;
5191 case NFT_MSG_NEWCHAIN:
5192 if (nft_trans_chain_update(trans)) {
5193 free_percpu(nft_trans_chain_stats(trans));
5194
5195 nft_trans_destroy(trans);
5196 } else {
5197 trans->ctx.table->use--;
5198 list_del_rcu(&trans->ctx.chain->list);
5199 nf_tables_unregister_hooks(trans->ctx.net,
5200 trans->ctx.table,
5201 trans->ctx.chain,
5202 trans->ctx.afi->nops);
5203 }
5204 break;
5205 case NFT_MSG_DELCHAIN:
5206 trans->ctx.table->use++;
5207 nft_clear(trans->ctx.net, trans->ctx.chain);
5208 nft_trans_destroy(trans);
5209 break;
5210 case NFT_MSG_NEWRULE:
5211 trans->ctx.chain->use--;
5212 list_del_rcu(&nft_trans_rule(trans)->list);
5213 break;
5214 case NFT_MSG_DELRULE:
5215 trans->ctx.chain->use++;
5216 nft_clear(trans->ctx.net, nft_trans_rule(trans));
5217 nft_trans_destroy(trans);
5218 break;
5219 case NFT_MSG_NEWSET:
5220 trans->ctx.table->use--;
5221 list_del_rcu(&nft_trans_set(trans)->list);
5222 break;
5223 case NFT_MSG_DELSET:
5224 trans->ctx.table->use++;
5225 nft_clear(trans->ctx.net, nft_trans_set(trans));
5226 nft_trans_destroy(trans);
5227 break;
5228 case NFT_MSG_NEWSETELEM:
5229 te = (struct nft_trans_elem *)trans->data;
5230
5231 te->set->ops->remove(net, te->set, &te->elem);
5232 atomic_dec(&te->set->nelems);
5233 break;
5234 case NFT_MSG_DELSETELEM:
5235 te = (struct nft_trans_elem *)trans->data;
5236
5237 nft_set_elem_activate(net, te->set, &te->elem);
5238 te->set->ops->activate(net, te->set, &te->elem);
5239 te->set->ndeact--;
5240
5241 nft_trans_destroy(trans);
5242 break;
5243 case NFT_MSG_NEWOBJ:
5244 trans->ctx.table->use--;
5245 list_del_rcu(&nft_trans_obj(trans)->list);
5246 break;
5247 case NFT_MSG_DELOBJ:
5248 trans->ctx.table->use++;
5249 nft_clear(trans->ctx.net, nft_trans_obj(trans));
5250 nft_trans_destroy(trans);
5251 break;
5252 }
5253 }
5254
5255 synchronize_rcu();
5256
5257 list_for_each_entry_safe_reverse(trans, next,
5258 &net->nft.commit_list, list) {
5259 list_del(&trans->list);
5260 nf_tables_abort_release(trans);
5261 }
5262
5263 return 0;
5264 }
5265
5266 static bool nf_tables_valid_genid(struct net *net, u32 genid)
5267 {
5268 return net->nft.base_seq == genid;
5269 }
5270
5271 static const struct nfnetlink_subsystem nf_tables_subsys = {
5272 .name = "nf_tables",
5273 .subsys_id = NFNL_SUBSYS_NFTABLES,
5274 .cb_count = NFT_MSG_MAX,
5275 .cb = nf_tables_cb,
5276 .commit = nf_tables_commit,
5277 .abort = nf_tables_abort,
5278 .valid_genid = nf_tables_valid_genid,
5279 };
5280
5281 int nft_chain_validate_dependency(const struct nft_chain *chain,
5282 enum nft_chain_type type)
5283 {
5284 const struct nft_base_chain *basechain;
5285
5286 if (nft_is_base_chain(chain)) {
5287 basechain = nft_base_chain(chain);
5288 if (basechain->type->type != type)
5289 return -EOPNOTSUPP;
5290 }
5291 return 0;
5292 }
5293 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
5294
5295 int nft_chain_validate_hooks(const struct nft_chain *chain,
5296 unsigned int hook_flags)
5297 {
5298 struct nft_base_chain *basechain;
5299
5300 if (nft_is_base_chain(chain)) {
5301 basechain = nft_base_chain(chain);
5302
5303 if ((1 << basechain->ops[0].hooknum) & hook_flags)
5304 return 0;
5305
5306 return -EOPNOTSUPP;
5307 }
5308
5309 return 0;
5310 }
5311 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
5312
5313 /*
5314 * Loop detection - walk through the ruleset beginning at the destination chain
5315 * of a new jump until either the source chain is reached (loop) or all
5316 * reachable chains have been traversed.
5317 *
5318 * The loop check is performed whenever a new jump verdict is added to an
5319 * expression or verdict map or a verdict map is bound to a new chain.
5320 */
5321
5322 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5323 const struct nft_chain *chain);
5324
5325 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
5326 struct nft_set *set,
5327 const struct nft_set_iter *iter,
5328 struct nft_set_elem *elem)
5329 {
5330 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5331 const struct nft_data *data;
5332
5333 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5334 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
5335 return 0;
5336
5337 data = nft_set_ext_data(ext);
5338 switch (data->verdict.code) {
5339 case NFT_JUMP:
5340 case NFT_GOTO:
5341 return nf_tables_check_loops(ctx, data->verdict.chain);
5342 default:
5343 return 0;
5344 }
5345 }
5346
5347 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5348 const struct nft_chain *chain)
5349 {
5350 const struct nft_rule *rule;
5351 const struct nft_expr *expr, *last;
5352 struct nft_set *set;
5353 struct nft_set_binding *binding;
5354 struct nft_set_iter iter;
5355
5356 if (ctx->chain == chain)
5357 return -ELOOP;
5358
5359 list_for_each_entry(rule, &chain->rules, list) {
5360 nft_rule_for_each_expr(expr, last, rule) {
5361 const struct nft_data *data = NULL;
5362 int err;
5363
5364 if (!expr->ops->validate)
5365 continue;
5366
5367 err = expr->ops->validate(ctx, expr, &data);
5368 if (err < 0)
5369 return err;
5370
5371 if (data == NULL)
5372 continue;
5373
5374 switch (data->verdict.code) {
5375 case NFT_JUMP:
5376 case NFT_GOTO:
5377 err = nf_tables_check_loops(ctx,
5378 data->verdict.chain);
5379 if (err < 0)
5380 return err;
5381 default:
5382 break;
5383 }
5384 }
5385 }
5386
5387 list_for_each_entry(set, &ctx->table->sets, list) {
5388 if (!nft_is_active_next(ctx->net, set))
5389 continue;
5390 if (!(set->flags & NFT_SET_MAP) ||
5391 set->dtype != NFT_DATA_VERDICT)
5392 continue;
5393
5394 list_for_each_entry(binding, &set->bindings, list) {
5395 if (!(binding->flags & NFT_SET_MAP) ||
5396 binding->chain != chain)
5397 continue;
5398
5399 iter.genmask = nft_genmask_next(ctx->net);
5400 iter.skip = 0;
5401 iter.count = 0;
5402 iter.err = 0;
5403 iter.fn = nf_tables_loop_check_setelem;
5404
5405 set->ops->walk(ctx, set, &iter);
5406 if (iter.err < 0)
5407 return iter.err;
5408 }
5409 }
5410
5411 return 0;
5412 }
5413
5414 /**
5415 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
5416 *
5417 * @attr: netlink attribute to fetch value from
5418 * @max: maximum value to be stored in dest
5419 * @dest: pointer to the variable
5420 *
5421 * Parse, check and store a given u32 netlink attribute into variable.
5422 * This function returns -ERANGE if the value goes over maximum value.
5423 * Otherwise a 0 is returned and the attribute value is stored in the
5424 * destination variable.
5425 */
5426 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
5427 {
5428 u32 val;
5429
5430 val = ntohl(nla_get_be32(attr));
5431 if (val > max)
5432 return -ERANGE;
5433
5434 *dest = val;
5435 return 0;
5436 }
5437 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
5438
5439 /**
5440 * nft_parse_register - parse a register value from a netlink attribute
5441 *
5442 * @attr: netlink attribute
5443 *
5444 * Parse and translate a register value from a netlink attribute.
5445 * Registers used to be 128 bit wide, these register numbers will be
5446 * mapped to the corresponding 32 bit register numbers.
5447 */
5448 unsigned int nft_parse_register(const struct nlattr *attr)
5449 {
5450 unsigned int reg;
5451
5452 reg = ntohl(nla_get_be32(attr));
5453 switch (reg) {
5454 case NFT_REG_VERDICT...NFT_REG_4:
5455 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
5456 default:
5457 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
5458 }
5459 }
5460 EXPORT_SYMBOL_GPL(nft_parse_register);
5461
5462 /**
5463 * nft_dump_register - dump a register value to a netlink attribute
5464 *
5465 * @skb: socket buffer
5466 * @attr: attribute number
5467 * @reg: register number
5468 *
5469 * Construct a netlink attribute containing the register number. For
5470 * compatibility reasons, register numbers being a multiple of 4 are
5471 * translated to the corresponding 128 bit register numbers.
5472 */
5473 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
5474 {
5475 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
5476 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
5477 else
5478 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
5479
5480 return nla_put_be32(skb, attr, htonl(reg));
5481 }
5482 EXPORT_SYMBOL_GPL(nft_dump_register);
5483
5484 /**
5485 * nft_validate_register_load - validate a load from a register
5486 *
5487 * @reg: the register number
5488 * @len: the length of the data
5489 *
5490 * Validate that the input register is one of the general purpose
5491 * registers and that the length of the load is within the bounds.
5492 */
5493 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
5494 {
5495 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5496 return -EINVAL;
5497 if (len == 0)
5498 return -EINVAL;
5499 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
5500 return -ERANGE;
5501
5502 return 0;
5503 }
5504 EXPORT_SYMBOL_GPL(nft_validate_register_load);
5505
5506 /**
5507 * nft_validate_register_store - validate an expressions' register store
5508 *
5509 * @ctx: context of the expression performing the load
5510 * @reg: the destination register number
5511 * @data: the data to load
5512 * @type: the data type
5513 * @len: the length of the data
5514 *
5515 * Validate that a data load uses the appropriate data type for
5516 * the destination register and the length is within the bounds.
5517 * A value of NULL for the data means that its runtime gathered
5518 * data.
5519 */
5520 int nft_validate_register_store(const struct nft_ctx *ctx,
5521 enum nft_registers reg,
5522 const struct nft_data *data,
5523 enum nft_data_types type, unsigned int len)
5524 {
5525 int err;
5526
5527 switch (reg) {
5528 case NFT_REG_VERDICT:
5529 if (type != NFT_DATA_VERDICT)
5530 return -EINVAL;
5531
5532 if (data != NULL &&
5533 (data->verdict.code == NFT_GOTO ||
5534 data->verdict.code == NFT_JUMP)) {
5535 err = nf_tables_check_loops(ctx, data->verdict.chain);
5536 if (err < 0)
5537 return err;
5538
5539 if (ctx->chain->level + 1 >
5540 data->verdict.chain->level) {
5541 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
5542 return -EMLINK;
5543 data->verdict.chain->level = ctx->chain->level + 1;
5544 }
5545 }
5546
5547 return 0;
5548 default:
5549 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5550 return -EINVAL;
5551 if (len == 0)
5552 return -EINVAL;
5553 if (reg * NFT_REG32_SIZE + len >
5554 FIELD_SIZEOF(struct nft_regs, data))
5555 return -ERANGE;
5556
5557 if (data != NULL && type != NFT_DATA_VALUE)
5558 return -EINVAL;
5559 return 0;
5560 }
5561 }
5562 EXPORT_SYMBOL_GPL(nft_validate_register_store);
5563
5564 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
5565 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
5566 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
5567 .len = NFT_CHAIN_MAXNAMELEN - 1 },
5568 };
5569
5570 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
5571 struct nft_data_desc *desc, const struct nlattr *nla)
5572 {
5573 u8 genmask = nft_genmask_next(ctx->net);
5574 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
5575 struct nft_chain *chain;
5576 int err;
5577
5578 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
5579 NULL);
5580 if (err < 0)
5581 return err;
5582
5583 if (!tb[NFTA_VERDICT_CODE])
5584 return -EINVAL;
5585 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
5586
5587 switch (data->verdict.code) {
5588 default:
5589 switch (data->verdict.code & NF_VERDICT_MASK) {
5590 case NF_ACCEPT:
5591 case NF_DROP:
5592 case NF_QUEUE:
5593 break;
5594 default:
5595 return -EINVAL;
5596 }
5597 /* fall through */
5598 case NFT_CONTINUE:
5599 case NFT_BREAK:
5600 case NFT_RETURN:
5601 break;
5602 case NFT_JUMP:
5603 case NFT_GOTO:
5604 if (!tb[NFTA_VERDICT_CHAIN])
5605 return -EINVAL;
5606 chain = nf_tables_chain_lookup(ctx->table,
5607 tb[NFTA_VERDICT_CHAIN], genmask);
5608 if (IS_ERR(chain))
5609 return PTR_ERR(chain);
5610 if (nft_is_base_chain(chain))
5611 return -EOPNOTSUPP;
5612
5613 chain->use++;
5614 data->verdict.chain = chain;
5615 break;
5616 }
5617
5618 desc->len = sizeof(data->verdict);
5619 desc->type = NFT_DATA_VERDICT;
5620 return 0;
5621 }
5622
5623 static void nft_verdict_uninit(const struct nft_data *data)
5624 {
5625 switch (data->verdict.code) {
5626 case NFT_JUMP:
5627 case NFT_GOTO:
5628 data->verdict.chain->use--;
5629 break;
5630 }
5631 }
5632
5633 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
5634 {
5635 struct nlattr *nest;
5636
5637 nest = nla_nest_start(skb, type);
5638 if (!nest)
5639 goto nla_put_failure;
5640
5641 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
5642 goto nla_put_failure;
5643
5644 switch (v->code) {
5645 case NFT_JUMP:
5646 case NFT_GOTO:
5647 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
5648 v->chain->name))
5649 goto nla_put_failure;
5650 }
5651 nla_nest_end(skb, nest);
5652 return 0;
5653
5654 nla_put_failure:
5655 return -1;
5656 }
5657
5658 static int nft_value_init(const struct nft_ctx *ctx,
5659 struct nft_data *data, unsigned int size,
5660 struct nft_data_desc *desc, const struct nlattr *nla)
5661 {
5662 unsigned int len;
5663
5664 len = nla_len(nla);
5665 if (len == 0)
5666 return -EINVAL;
5667 if (len > size)
5668 return -EOVERFLOW;
5669
5670 nla_memcpy(data->data, nla, len);
5671 desc->type = NFT_DATA_VALUE;
5672 desc->len = len;
5673 return 0;
5674 }
5675
5676 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
5677 unsigned int len)
5678 {
5679 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
5680 }
5681
5682 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
5683 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
5684 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
5685 };
5686
5687 /**
5688 * nft_data_init - parse nf_tables data netlink attributes
5689 *
5690 * @ctx: context of the expression using the data
5691 * @data: destination struct nft_data
5692 * @size: maximum data length
5693 * @desc: data description
5694 * @nla: netlink attribute containing data
5695 *
5696 * Parse the netlink data attributes and initialize a struct nft_data.
5697 * The type and length of data are returned in the data description.
5698 *
5699 * The caller can indicate that it only wants to accept data of type
5700 * NFT_DATA_VALUE by passing NULL for the ctx argument.
5701 */
5702 int nft_data_init(const struct nft_ctx *ctx,
5703 struct nft_data *data, unsigned int size,
5704 struct nft_data_desc *desc, const struct nlattr *nla)
5705 {
5706 struct nlattr *tb[NFTA_DATA_MAX + 1];
5707 int err;
5708
5709 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
5710 if (err < 0)
5711 return err;
5712
5713 if (tb[NFTA_DATA_VALUE])
5714 return nft_value_init(ctx, data, size, desc,
5715 tb[NFTA_DATA_VALUE]);
5716 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
5717 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
5718 return -EINVAL;
5719 }
5720 EXPORT_SYMBOL_GPL(nft_data_init);
5721
5722 /**
5723 * nft_data_release - release a nft_data item
5724 *
5725 * @data: struct nft_data to release
5726 * @type: type of data
5727 *
5728 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5729 * all others need to be released by calling this function.
5730 */
5731 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
5732 {
5733 if (type < NFT_DATA_VERDICT)
5734 return;
5735 switch (type) {
5736 case NFT_DATA_VERDICT:
5737 return nft_verdict_uninit(data);
5738 default:
5739 WARN_ON(1);
5740 }
5741 }
5742 EXPORT_SYMBOL_GPL(nft_data_release);
5743
5744 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
5745 enum nft_data_types type, unsigned int len)
5746 {
5747 struct nlattr *nest;
5748 int err;
5749
5750 nest = nla_nest_start(skb, attr);
5751 if (nest == NULL)
5752 return -1;
5753
5754 switch (type) {
5755 case NFT_DATA_VALUE:
5756 err = nft_value_dump(skb, data, len);
5757 break;
5758 case NFT_DATA_VERDICT:
5759 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
5760 break;
5761 default:
5762 err = -EINVAL;
5763 WARN_ON(1);
5764 }
5765
5766 nla_nest_end(skb, nest);
5767 return err;
5768 }
5769 EXPORT_SYMBOL_GPL(nft_data_dump);
5770
5771 static int __net_init nf_tables_init_net(struct net *net)
5772 {
5773 INIT_LIST_HEAD(&net->nft.af_info);
5774 INIT_LIST_HEAD(&net->nft.commit_list);
5775 net->nft.base_seq = 1;
5776 return 0;
5777 }
5778
5779 int __nft_release_basechain(struct nft_ctx *ctx)
5780 {
5781 struct nft_rule *rule, *nr;
5782
5783 BUG_ON(!nft_is_base_chain(ctx->chain));
5784
5785 nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
5786 ctx->afi->nops);
5787 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
5788 list_del(&rule->list);
5789 ctx->chain->use--;
5790 nf_tables_rule_destroy(ctx, rule);
5791 }
5792 list_del(&ctx->chain->list);
5793 ctx->table->use--;
5794 nf_tables_chain_destroy(ctx->chain);
5795
5796 return 0;
5797 }
5798 EXPORT_SYMBOL_GPL(__nft_release_basechain);
5799
5800 /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
5801 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
5802 {
5803 struct nft_table *table, *nt;
5804 struct nft_chain *chain, *nc;
5805 struct nft_object *obj, *ne;
5806 struct nft_rule *rule, *nr;
5807 struct nft_set *set, *ns;
5808 struct nft_ctx ctx = {
5809 .net = net,
5810 .afi = afi,
5811 };
5812
5813 list_for_each_entry_safe(table, nt, &afi->tables, list) {
5814 list_for_each_entry(chain, &table->chains, list)
5815 nf_tables_unregister_hooks(net, table, chain,
5816 afi->nops);
5817 /* No packets are walking on these chains anymore. */
5818 ctx.table = table;
5819 list_for_each_entry(chain, &table->chains, list) {
5820 ctx.chain = chain;
5821 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
5822 list_del(&rule->list);
5823 chain->use--;
5824 nf_tables_rule_destroy(&ctx, rule);
5825 }
5826 }
5827 list_for_each_entry_safe(set, ns, &table->sets, list) {
5828 list_del(&set->list);
5829 table->use--;
5830 nft_set_destroy(set);
5831 }
5832 list_for_each_entry_safe(obj, ne, &table->objects, list) {
5833 list_del(&obj->list);
5834 table->use--;
5835 nft_obj_destroy(obj);
5836 }
5837 list_for_each_entry_safe(chain, nc, &table->chains, list) {
5838 list_del(&chain->list);
5839 table->use--;
5840 nf_tables_chain_destroy(chain);
5841 }
5842 list_del(&table->list);
5843 nf_tables_table_destroy(&ctx);
5844 }
5845 }
5846
5847 static struct pernet_operations nf_tables_net_ops = {
5848 .init = nf_tables_init_net,
5849 };
5850
5851 static int __init nf_tables_module_init(void)
5852 {
5853 int err;
5854
5855 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
5856 GFP_KERNEL);
5857 if (info == NULL) {
5858 err = -ENOMEM;
5859 goto err1;
5860 }
5861
5862 err = nf_tables_core_module_init();
5863 if (err < 0)
5864 goto err2;
5865
5866 err = nfnetlink_subsys_register(&nf_tables_subsys);
5867 if (err < 0)
5868 goto err3;
5869
5870 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
5871 return register_pernet_subsys(&nf_tables_net_ops);
5872 err3:
5873 nf_tables_core_module_exit();
5874 err2:
5875 kfree(info);
5876 err1:
5877 return err;
5878 }
5879
5880 static void __exit nf_tables_module_exit(void)
5881 {
5882 unregister_pernet_subsys(&nf_tables_net_ops);
5883 nfnetlink_subsys_unregister(&nf_tables_subsys);
5884 rcu_barrier();
5885 nf_tables_core_module_exit();
5886 kfree(info);
5887 }
5888
5889 module_init(nf_tables_module_init);
5890 module_exit(nf_tables_module_exit);
5891
5892 MODULE_LICENSE("GPL");
5893 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
5894 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
Ubuntu Focal Linux kernel mirror