2 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
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.
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/list.h>
14 #include <linux/skbuff.h>
15 #include <linux/netlink.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_tables_core.h>
20 #include <net/netfilter/nf_tables.h>
23 static LIST_HEAD(nf_tables_afinfo);
24 static LIST_HEAD(nf_tables_expressions);
27 * nft_register_afinfo - register nf_tables address family info
29 * @afi: address family info to register
31 * Register the address family for use with nf_tables. Returns zero on
32 * success or a negative errno code otherwise.
34 int nft_register_afinfo(struct nft_af_info *afi)
36 INIT_LIST_HEAD(&afi->tables);
37 nfnl_lock(NFNL_SUBSYS_NFTABLES);
38 list_add_tail(&afi->list, &nf_tables_afinfo);
39 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
42 EXPORT_SYMBOL_GPL(nft_register_afinfo);
45 * nft_unregister_afinfo - unregister nf_tables address family info
47 * @afi: address family info to unregister
49 * Unregister the address family for use with nf_tables.
51 void nft_unregister_afinfo(struct nft_af_info *afi)
53 nfnl_lock(NFNL_SUBSYS_NFTABLES);
55 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
57 EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
59 static struct nft_af_info *nft_afinfo_lookup(int family)
61 struct nft_af_info *afi;
63 list_for_each_entry(afi, &nf_tables_afinfo, list) {
64 if (afi->family == family)
70 static struct nft_af_info *nf_tables_afinfo_lookup(int family, bool autoload)
72 struct nft_af_info *afi;
74 afi = nft_afinfo_lookup(family);
79 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
80 request_module("nft-afinfo-%u", family);
81 nfnl_lock(NFNL_SUBSYS_NFTABLES);
82 afi = nft_afinfo_lookup(family);
84 return ERR_PTR(-EAGAIN);
87 return ERR_PTR(-EAFNOSUPPORT);
94 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
95 const struct nlattr *nla)
97 struct nft_table *table;
99 list_for_each_entry(table, &afi->tables, list) {
100 if (!nla_strcmp(nla, table->name))
106 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
107 const struct nlattr *nla,
110 struct nft_table *table;
113 return ERR_PTR(-EINVAL);
115 table = nft_table_lookup(afi, nla);
119 #ifdef CONFIG_MODULES
121 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
122 request_module("nft-table-%u-%*.s", afi->family,
123 nla_len(nla)-1, (const char *)nla_data(nla));
124 nfnl_lock(NFNL_SUBSYS_NFTABLES);
125 if (nft_table_lookup(afi, nla))
126 return ERR_PTR(-EAGAIN);
129 return ERR_PTR(-ENOENT);
132 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
134 return ++table->hgenerator;
137 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
138 [NFTA_TABLE_NAME] = { .type = NLA_STRING },
141 static int nf_tables_fill_table_info(struct sk_buff *skb, u32 portid, u32 seq,
142 int event, u32 flags, int family,
143 const struct nft_table *table)
145 struct nlmsghdr *nlh;
146 struct nfgenmsg *nfmsg;
148 event |= NFNL_SUBSYS_NFTABLES << 8;
149 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
151 goto nla_put_failure;
153 nfmsg = nlmsg_data(nlh);
154 nfmsg->nfgen_family = family;
155 nfmsg->version = NFNETLINK_V0;
158 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name))
159 goto nla_put_failure;
161 return nlmsg_end(skb, nlh);
164 nlmsg_trim(skb, nlh);
168 static int nf_tables_table_notify(const struct sk_buff *oskb,
169 const struct nlmsghdr *nlh,
170 const struct nft_table *table,
171 int event, int family)
174 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
175 u32 seq = nlh ? nlh->nlmsg_seq : 0;
176 struct net *net = oskb ? sock_net(oskb->sk) : &init_net;
180 report = nlh ? nlmsg_report(nlh) : false;
181 if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
185 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
189 err = nf_tables_fill_table_info(skb, portid, seq, event, 0,
196 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report,
200 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
204 static int nf_tables_dump_tables(struct sk_buff *skb,
205 struct netlink_callback *cb)
207 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
208 const struct nft_af_info *afi;
209 const struct nft_table *table;
210 unsigned int idx = 0, s_idx = cb->args[0];
211 int family = nfmsg->nfgen_family;
213 list_for_each_entry(afi, &nf_tables_afinfo, list) {
214 if (family != NFPROTO_UNSPEC && family != afi->family)
217 list_for_each_entry(table, &afi->tables, list) {
221 memset(&cb->args[1], 0,
222 sizeof(cb->args) - sizeof(cb->args[0]));
223 if (nf_tables_fill_table_info(skb,
224 NETLINK_CB(cb->skb).portid,
228 afi->family, table) < 0)
239 static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb,
240 const struct nlmsghdr *nlh,
241 const struct nlattr * const nla[])
243 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
244 const struct nft_af_info *afi;
245 const struct nft_table *table;
246 struct sk_buff *skb2;
247 int family = nfmsg->nfgen_family;
250 if (nlh->nlmsg_flags & NLM_F_DUMP) {
251 struct netlink_dump_control c = {
252 .dump = nf_tables_dump_tables,
254 return netlink_dump_start(nlsk, skb, nlh, &c);
257 afi = nf_tables_afinfo_lookup(family, false);
261 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], false);
263 return PTR_ERR(table);
265 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
269 err = nf_tables_fill_table_info(skb2, NETLINK_CB(skb).portid,
270 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
275 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
282 static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
283 const struct nlmsghdr *nlh,
284 const struct nlattr * const nla[])
286 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
287 const struct nlattr *name;
288 struct nft_af_info *afi;
289 struct nft_table *table;
290 int family = nfmsg->nfgen_family;
292 afi = nf_tables_afinfo_lookup(family, true);
296 name = nla[NFTA_TABLE_NAME];
297 table = nf_tables_table_lookup(afi, name, false);
299 if (PTR_ERR(table) != -ENOENT)
300 return PTR_ERR(table);
305 if (nlh->nlmsg_flags & NLM_F_EXCL)
307 if (nlh->nlmsg_flags & NLM_F_REPLACE)
312 table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL);
316 nla_strlcpy(table->name, name, nla_len(name));
317 INIT_LIST_HEAD(&table->chains);
318 INIT_LIST_HEAD(&table->sets);
320 list_add_tail(&table->list, &afi->tables);
321 nf_tables_table_notify(skb, nlh, table, NFT_MSG_NEWTABLE, family);
325 static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb,
326 const struct nlmsghdr *nlh,
327 const struct nlattr * const nla[])
329 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
330 struct nft_af_info *afi;
331 struct nft_table *table;
332 int family = nfmsg->nfgen_family;
334 afi = nf_tables_afinfo_lookup(family, false);
338 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], false);
340 return PTR_ERR(table);
342 if (table->flags & NFT_TABLE_BUILTIN)
348 list_del(&table->list);
349 nf_tables_table_notify(skb, nlh, table, NFT_MSG_DELTABLE, family);
354 static struct nft_table *__nf_tables_table_lookup(const struct nft_af_info *afi,
357 struct nft_table *table;
359 list_for_each_entry(table, &afi->tables, list) {
360 if (!strcmp(name, table->name))
364 return ERR_PTR(-ENOENT);
367 static int nf_tables_chain_notify(const struct sk_buff *oskb,
368 const struct nlmsghdr *nlh,
369 const struct nft_table *table,
370 const struct nft_chain *chain,
371 int event, int family);
374 * nft_register_table - register a built-in table
376 * @table: the table to register
377 * @family: protocol family to register table with
379 * Register a built-in table for use with nf_tables. Returns zero on
380 * success or a negative errno code otherwise.
382 int nft_register_table(struct nft_table *table, int family)
384 struct nft_af_info *afi;
386 struct nft_chain *chain;
389 nfnl_lock(NFNL_SUBSYS_NFTABLES);
391 afi = nf_tables_afinfo_lookup(family, true);
399 t = __nf_tables_table_lookup(afi, table->name);
412 table->flags |= NFT_TABLE_BUILTIN;
413 INIT_LIST_HEAD(&table->sets);
414 list_add_tail(&table->list, &afi->tables);
415 nf_tables_table_notify(NULL, NULL, table, NFT_MSG_NEWTABLE, family);
416 list_for_each_entry(chain, &table->chains, list)
417 nf_tables_chain_notify(NULL, NULL, table, chain,
418 NFT_MSG_NEWCHAIN, family);
421 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
424 EXPORT_SYMBOL_GPL(nft_register_table);
427 * nft_unregister_table - unregister a built-in table
429 * @table: the table to unregister
430 * @family: protocol family to unregister table with
432 * Unregister a built-in table for use with nf_tables.
434 void nft_unregister_table(struct nft_table *table, int family)
436 struct nft_chain *chain;
438 nfnl_lock(NFNL_SUBSYS_NFTABLES);
439 list_del(&table->list);
440 list_for_each_entry(chain, &table->chains, list)
441 nf_tables_chain_notify(NULL, NULL, table, chain,
442 NFT_MSG_DELCHAIN, family);
443 nf_tables_table_notify(NULL, NULL, table, NFT_MSG_DELTABLE, family);
444 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
446 EXPORT_SYMBOL_GPL(nft_unregister_table);
452 static struct nft_chain *
453 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
455 struct nft_chain *chain;
457 list_for_each_entry(chain, &table->chains, list) {
458 if (chain->handle == handle)
462 return ERR_PTR(-ENOENT);
465 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
466 const struct nlattr *nla)
468 struct nft_chain *chain;
471 return ERR_PTR(-EINVAL);
473 list_for_each_entry(chain, &table->chains, list) {
474 if (!nla_strcmp(nla, chain->name))
478 return ERR_PTR(-ENOENT);
481 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
482 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
483 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
484 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
485 .len = NFT_CHAIN_MAXNAMELEN - 1 },
486 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
489 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
490 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
491 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
494 static int nf_tables_fill_chain_info(struct sk_buff *skb, u32 portid, u32 seq,
495 int event, u32 flags, int family,
496 const struct nft_table *table,
497 const struct nft_chain *chain)
499 struct nlmsghdr *nlh;
500 struct nfgenmsg *nfmsg;
502 event |= NFNL_SUBSYS_NFTABLES << 8;
503 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
505 goto nla_put_failure;
507 nfmsg = nlmsg_data(nlh);
508 nfmsg->nfgen_family = family;
509 nfmsg->version = NFNETLINK_V0;
512 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
513 goto nla_put_failure;
514 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle)))
515 goto nla_put_failure;
516 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
517 goto nla_put_failure;
519 if (chain->flags & NFT_BASE_CHAIN) {
520 const struct nf_hook_ops *ops = &nft_base_chain(chain)->ops;
521 struct nlattr *nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
523 goto nla_put_failure;
524 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
525 goto nla_put_failure;
526 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
527 goto nla_put_failure;
528 nla_nest_end(skb, nest);
531 return nlmsg_end(skb, nlh);
534 nlmsg_trim(skb, nlh);
538 static int nf_tables_chain_notify(const struct sk_buff *oskb,
539 const struct nlmsghdr *nlh,
540 const struct nft_table *table,
541 const struct nft_chain *chain,
542 int event, int family)
545 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
546 struct net *net = oskb ? sock_net(oskb->sk) : &init_net;
547 u32 seq = nlh ? nlh->nlmsg_seq : 0;
551 report = nlh ? nlmsg_report(nlh) : false;
552 if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
556 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
560 err = nf_tables_fill_chain_info(skb, portid, seq, event, 0, family,
567 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report,
571 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
575 static int nf_tables_dump_chains(struct sk_buff *skb,
576 struct netlink_callback *cb)
578 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
579 const struct nft_af_info *afi;
580 const struct nft_table *table;
581 const struct nft_chain *chain;
582 unsigned int idx = 0, s_idx = cb->args[0];
583 int family = nfmsg->nfgen_family;
585 list_for_each_entry(afi, &nf_tables_afinfo, list) {
586 if (family != NFPROTO_UNSPEC && family != afi->family)
589 list_for_each_entry(table, &afi->tables, list) {
590 list_for_each_entry(chain, &table->chains, list) {
594 memset(&cb->args[1], 0,
595 sizeof(cb->args) - sizeof(cb->args[0]));
596 if (nf_tables_fill_chain_info(skb, NETLINK_CB(cb->skb).portid,
600 afi->family, table, chain) < 0)
613 static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb,
614 const struct nlmsghdr *nlh,
615 const struct nlattr * const nla[])
617 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
618 const struct nft_af_info *afi;
619 const struct nft_table *table;
620 const struct nft_chain *chain;
621 struct sk_buff *skb2;
622 int family = nfmsg->nfgen_family;
625 if (nlh->nlmsg_flags & NLM_F_DUMP) {
626 struct netlink_dump_control c = {
627 .dump = nf_tables_dump_chains,
629 return netlink_dump_start(nlsk, skb, nlh, &c);
632 afi = nf_tables_afinfo_lookup(family, false);
636 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], false);
638 return PTR_ERR(table);
640 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
642 return PTR_ERR(chain);
644 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
648 err = nf_tables_fill_chain_info(skb2, NETLINK_CB(skb).portid,
649 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
650 family, table, chain);
654 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
661 static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
662 const struct nlmsghdr *nlh,
663 const struct nlattr * const nla[])
665 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
666 const struct nlattr * uninitialized_var(name);
667 const struct nft_af_info *afi;
668 struct nft_table *table;
669 struct nft_chain *chain;
670 struct nft_base_chain *basechain;
671 struct nlattr *ha[NFTA_HOOK_MAX + 1];
672 int family = nfmsg->nfgen_family;
677 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
679 afi = nf_tables_afinfo_lookup(family, true);
683 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], create);
685 return PTR_ERR(table);
687 if (table->use == UINT_MAX)
691 name = nla[NFTA_CHAIN_NAME];
693 if (nla[NFTA_CHAIN_HANDLE]) {
694 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
695 chain = nf_tables_chain_lookup_byhandle(table, handle);
697 return PTR_ERR(chain);
699 chain = nf_tables_chain_lookup(table, name);
701 if (PTR_ERR(chain) != -ENOENT)
702 return PTR_ERR(chain);
708 if (nlh->nlmsg_flags & NLM_F_EXCL)
710 if (nlh->nlmsg_flags & NLM_F_REPLACE)
713 if (nla[NFTA_CHAIN_HANDLE] && name &&
714 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
717 if (nla[NFTA_CHAIN_HANDLE] && name)
718 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
723 if (nla[NFTA_CHAIN_HOOK]) {
724 struct nf_hook_ops *ops;
726 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
730 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
731 ha[NFTA_HOOK_PRIORITY] == NULL)
733 if (ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])) >= afi->nhooks)
736 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
737 if (basechain == NULL)
739 chain = &basechain->chain;
741 ops = &basechain->ops;
743 ops->owner = afi->owner;
744 ops->hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
745 ops->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
747 ops->hook = nft_do_chain;
748 if (afi->hooks[ops->hooknum])
749 ops->hook = afi->hooks[ops->hooknum];
751 chain->flags |= NFT_BASE_CHAIN;
753 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
758 INIT_LIST_HEAD(&chain->rules);
759 chain->handle = nf_tables_alloc_handle(table);
760 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
762 list_add_tail(&chain->list, &table->chains);
765 nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_NEWCHAIN,
770 static void nf_tables_rcu_chain_destroy(struct rcu_head *head)
772 struct nft_chain *chain = container_of(head, struct nft_chain, rcu_head);
774 BUG_ON(chain->use > 0);
776 if (chain->flags & NFT_BASE_CHAIN)
777 kfree(nft_base_chain(chain));
782 static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
783 const struct nlmsghdr *nlh,
784 const struct nlattr * const nla[])
786 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
787 const struct nft_af_info *afi;
788 struct nft_table *table;
789 struct nft_chain *chain;
790 int family = nfmsg->nfgen_family;
792 afi = nf_tables_afinfo_lookup(family, false);
796 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], false);
798 return PTR_ERR(table);
800 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
802 return PTR_ERR(chain);
804 if (chain->flags & NFT_CHAIN_BUILTIN)
807 if (!list_empty(&chain->rules))
810 list_del(&chain->list);
813 if (chain->flags & NFT_BASE_CHAIN)
814 nf_unregister_hook(&nft_base_chain(chain)->ops);
816 nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_DELCHAIN,
819 /* Make sure all rule references are gone before this is released */
820 call_rcu(&chain->rcu_head, nf_tables_rcu_chain_destroy);
824 static void nft_ctx_init(struct nft_ctx *ctx,
825 const struct sk_buff *skb,
826 const struct nlmsghdr *nlh,
827 const struct nft_af_info *afi,
828 const struct nft_table *table,
829 const struct nft_chain *chain)
843 * nft_register_expr - register nf_tables expr operations
844 * @ops: expr operations
846 * Registers the expr operations for use with nf_tables. Returns zero on
847 * success or a negative errno code otherwise.
849 int nft_register_expr(struct nft_expr_ops *ops)
851 nfnl_lock(NFNL_SUBSYS_NFTABLES);
852 list_add_tail(&ops->list, &nf_tables_expressions);
853 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
856 EXPORT_SYMBOL_GPL(nft_register_expr);
859 * nft_unregister_expr - unregister nf_tables expr operations
860 * @ops: expr operations
862 * Unregisters the expr operations for use with nf_tables.
864 void nft_unregister_expr(struct nft_expr_ops *ops)
866 nfnl_lock(NFNL_SUBSYS_NFTABLES);
867 list_del(&ops->list);
868 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
870 EXPORT_SYMBOL_GPL(nft_unregister_expr);
872 static const struct nft_expr_ops *__nft_expr_ops_get(struct nlattr *nla)
874 const struct nft_expr_ops *ops;
876 list_for_each_entry(ops, &nf_tables_expressions, list) {
877 if (!nla_strcmp(nla, ops->name))
883 static const struct nft_expr_ops *nft_expr_ops_get(struct nlattr *nla)
885 const struct nft_expr_ops *ops;
888 return ERR_PTR(-EINVAL);
890 ops = __nft_expr_ops_get(nla);
891 if (ops != NULL && try_module_get(ops->owner))
894 #ifdef CONFIG_MODULES
896 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
897 request_module("nft-expr-%.*s",
898 nla_len(nla), (char *)nla_data(nla));
899 nfnl_lock(NFNL_SUBSYS_NFTABLES);
900 if (__nft_expr_ops_get(nla))
901 return ERR_PTR(-EAGAIN);
904 return ERR_PTR(-ENOENT);
907 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
908 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
909 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
912 static int nf_tables_fill_expr_info(struct sk_buff *skb,
913 const struct nft_expr *expr)
915 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->name))
916 goto nla_put_failure;
918 if (expr->ops->dump) {
919 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
921 goto nla_put_failure;
922 if (expr->ops->dump(skb, expr) < 0)
923 goto nla_put_failure;
924 nla_nest_end(skb, data);
933 struct nft_expr_info {
934 const struct nft_expr_ops *ops;
935 struct nlattr *tb[NFTA_EXPR_MAX + 1];
938 static int nf_tables_expr_parse(const struct nlattr *nla,
939 struct nft_expr_info *info)
941 const struct nft_expr_ops *ops;
944 err = nla_parse_nested(info->tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
948 ops = nft_expr_ops_get(info->tb[NFTA_EXPR_NAME]);
955 static int nf_tables_newexpr(const struct nft_ctx *ctx,
956 struct nft_expr_info *info,
957 struct nft_expr *expr)
959 const struct nft_expr_ops *ops = info->ops;
964 struct nlattr *ma[ops->maxattr + 1];
966 if (info->tb[NFTA_EXPR_DATA]) {
967 err = nla_parse_nested(ma, ops->maxattr,
968 info->tb[NFTA_EXPR_DATA],
973 memset(ma, 0, sizeof(ma[0]) * (ops->maxattr + 1));
975 err = ops->init(ctx, expr, (const struct nlattr **)ma);
988 static void nf_tables_expr_destroy(struct nft_expr *expr)
990 if (expr->ops->destroy)
991 expr->ops->destroy(expr);
992 module_put(expr->ops->owner);
999 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1002 struct nft_rule *rule;
1004 // FIXME: this sucks
1005 list_for_each_entry(rule, &chain->rules, list) {
1006 if (handle == rule->handle)
1010 return ERR_PTR(-ENOENT);
1013 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1014 const struct nlattr *nla)
1017 return ERR_PTR(-EINVAL);
1019 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1022 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1023 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1024 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1025 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1026 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1027 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1030 static int nf_tables_fill_rule_info(struct sk_buff *skb, u32 portid, u32 seq,
1031 int event, u32 flags, int family,
1032 const struct nft_table *table,
1033 const struct nft_chain *chain,
1034 const struct nft_rule *rule)
1036 struct nlmsghdr *nlh;
1037 struct nfgenmsg *nfmsg;
1038 const struct nft_expr *expr, *next;
1039 struct nlattr *list;
1041 event |= NFNL_SUBSYS_NFTABLES << 8;
1042 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
1045 goto nla_put_failure;
1047 nfmsg = nlmsg_data(nlh);
1048 nfmsg->nfgen_family = family;
1049 nfmsg->version = NFNETLINK_V0;
1052 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1053 goto nla_put_failure;
1054 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1055 goto nla_put_failure;
1056 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle)))
1057 goto nla_put_failure;
1059 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1061 goto nla_put_failure;
1062 nft_rule_for_each_expr(expr, next, rule) {
1063 struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM);
1065 goto nla_put_failure;
1066 if (nf_tables_fill_expr_info(skb, expr) < 0)
1067 goto nla_put_failure;
1068 nla_nest_end(skb, elem);
1070 nla_nest_end(skb, list);
1072 return nlmsg_end(skb, nlh);
1075 nlmsg_trim(skb, nlh);
1079 static int nf_tables_rule_notify(const struct sk_buff *oskb,
1080 const struct nlmsghdr *nlh,
1081 const struct nft_table *table,
1082 const struct nft_chain *chain,
1083 const struct nft_rule *rule,
1084 int event, u32 flags, int family)
1086 struct sk_buff *skb;
1087 u32 portid = NETLINK_CB(oskb).portid;
1088 struct net *net = oskb ? sock_net(oskb->sk) : &init_net;
1089 u32 seq = nlh->nlmsg_seq;
1093 report = nlmsg_report(nlh);
1094 if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
1098 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1102 err = nf_tables_fill_rule_info(skb, portid, seq, event, flags,
1103 family, table, chain, rule);
1109 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report,
1113 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
1117 static int nf_tables_dump_rules(struct sk_buff *skb,
1118 struct netlink_callback *cb)
1120 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1121 const struct nft_af_info *afi;
1122 const struct nft_table *table;
1123 const struct nft_chain *chain;
1124 const struct nft_rule *rule;
1125 unsigned int idx = 0, s_idx = cb->args[0];
1126 int family = nfmsg->nfgen_family;
1128 list_for_each_entry(afi, &nf_tables_afinfo, list) {
1129 if (family != NFPROTO_UNSPEC && family != afi->family)
1132 list_for_each_entry(table, &afi->tables, list) {
1133 list_for_each_entry(chain, &table->chains, list) {
1134 list_for_each_entry(rule, &chain->rules, list) {
1138 memset(&cb->args[1], 0,
1139 sizeof(cb->args) - sizeof(cb->args[0]));
1140 if (nf_tables_fill_rule_info(skb, NETLINK_CB(cb->skb).portid,
1143 NLM_F_MULTI | NLM_F_APPEND,
1144 afi->family, table, chain, rule) < 0)
1157 static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
1158 const struct nlmsghdr *nlh,
1159 const struct nlattr * const nla[])
1161 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1162 const struct nft_af_info *afi;
1163 const struct nft_table *table;
1164 const struct nft_chain *chain;
1165 const struct nft_rule *rule;
1166 struct sk_buff *skb2;
1167 int family = nfmsg->nfgen_family;
1170 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1171 struct netlink_dump_control c = {
1172 .dump = nf_tables_dump_rules,
1174 return netlink_dump_start(nlsk, skb, nlh, &c);
1177 afi = nf_tables_afinfo_lookup(family, false);
1179 return PTR_ERR(afi);
1181 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], false);
1183 return PTR_ERR(table);
1185 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1187 return PTR_ERR(chain);
1189 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1191 return PTR_ERR(rule);
1193 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1197 err = nf_tables_fill_rule_info(skb2, NETLINK_CB(skb).portid,
1198 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1199 family, table, chain, rule);
1203 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1210 static void nf_tables_rcu_rule_destroy(struct rcu_head *head)
1212 struct nft_rule *rule = container_of(head, struct nft_rule, rcu_head);
1213 struct nft_expr *expr;
1216 * Careful: some expressions might not be initialized in case this
1217 * is called on error from nf_tables_newrule().
1219 expr = nft_expr_first(rule);
1220 while (expr->ops && expr != nft_expr_last(rule)) {
1221 nf_tables_expr_destroy(expr);
1222 expr = nft_expr_next(expr);
1227 static void nf_tables_rule_destroy(struct nft_rule *rule)
1229 call_rcu(&rule->rcu_head, nf_tables_rcu_rule_destroy);
1232 #define NFT_RULE_MAXEXPRS 128
1234 static struct nft_expr_info *info;
1236 static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
1237 const struct nlmsghdr *nlh,
1238 const struct nlattr * const nla[])
1240 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1241 const struct nft_af_info *afi;
1242 struct nft_table *table;
1243 struct nft_chain *chain;
1244 struct nft_rule *rule, *old_rule = NULL;
1245 struct nft_expr *expr;
1248 unsigned int size, i, n;
1253 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1255 afi = nf_tables_afinfo_lookup(nfmsg->nfgen_family, create);
1257 return PTR_ERR(afi);
1259 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], create);
1261 return PTR_ERR(table);
1263 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1265 return PTR_ERR(chain);
1267 if (nla[NFTA_RULE_HANDLE]) {
1268 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
1269 rule = __nf_tables_rule_lookup(chain, handle);
1271 return PTR_ERR(rule);
1273 if (nlh->nlmsg_flags & NLM_F_EXCL)
1275 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1280 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
1282 handle = nf_tables_alloc_handle(table);
1287 if (nla[NFTA_RULE_EXPRESSIONS]) {
1288 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
1290 if (nla_type(tmp) != NFTA_LIST_ELEM)
1292 if (n == NFT_RULE_MAXEXPRS)
1294 err = nf_tables_expr_parse(tmp, &info[n]);
1297 size += info[n].ops->size;
1303 rule = kzalloc(sizeof(*rule) + size, GFP_KERNEL);
1307 rule->handle = handle;
1310 nft_ctx_init(&ctx, skb, nlh, afi, table, chain);
1311 expr = nft_expr_first(rule);
1312 for (i = 0; i < n; i++) {
1313 err = nf_tables_newexpr(&ctx, &info[i], expr);
1316 expr = nft_expr_next(expr);
1319 /* Register hook when first rule is inserted into a base chain */
1320 if (list_empty(&chain->rules) && chain->flags & NFT_BASE_CHAIN) {
1321 err = nf_register_hook(&nft_base_chain(chain)->ops);
1326 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
1327 list_replace_rcu(&old_rule->list, &rule->list);
1328 nf_tables_rule_destroy(old_rule);
1329 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
1330 list_add_tail_rcu(&rule->list, &chain->rules);
1332 list_add_rcu(&rule->list, &chain->rules);
1334 nf_tables_rule_notify(skb, nlh, table, chain, rule, NFT_MSG_NEWRULE,
1335 nlh->nlmsg_flags & (NLM_F_APPEND | NLM_F_REPLACE),
1336 nfmsg->nfgen_family);
1340 nf_tables_rule_destroy(rule);
1342 for (i = 0; i < n; i++) {
1343 if (info[i].ops != NULL)
1344 module_put(info[i].ops->owner);
1349 static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
1350 const struct nlmsghdr *nlh,
1351 const struct nlattr * const nla[])
1353 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1354 const struct nft_af_info *afi;
1355 const struct nft_table *table;
1356 struct nft_chain *chain;
1357 struct nft_rule *rule, *tmp;
1358 int family = nfmsg->nfgen_family;
1360 afi = nf_tables_afinfo_lookup(family, false);
1362 return PTR_ERR(afi);
1364 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], false);
1366 return PTR_ERR(table);
1368 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1370 return PTR_ERR(chain);
1372 if (nla[NFTA_RULE_HANDLE]) {
1373 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1375 return PTR_ERR(rule);
1377 /* List removal must be visible before destroying expressions */
1378 list_del_rcu(&rule->list);
1380 nf_tables_rule_notify(skb, nlh, table, chain, rule,
1381 NFT_MSG_DELRULE, 0, family);
1382 nf_tables_rule_destroy(rule);
1384 /* Remove all rules in this chain */
1385 list_for_each_entry_safe(rule, tmp, &chain->rules, list) {
1386 list_del_rcu(&rule->list);
1388 nf_tables_rule_notify(skb, nlh, table, chain, rule,
1389 NFT_MSG_DELRULE, 0, family);
1390 nf_tables_rule_destroy(rule);
1394 /* Unregister hook when last rule from base chain is deleted */
1395 if (list_empty(&chain->rules) && chain->flags & NFT_BASE_CHAIN)
1396 nf_unregister_hook(&nft_base_chain(chain)->ops);
1405 static LIST_HEAD(nf_tables_set_ops);
1407 int nft_register_set(struct nft_set_ops *ops)
1409 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1410 list_add_tail(&ops->list, &nf_tables_set_ops);
1411 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1414 EXPORT_SYMBOL_GPL(nft_register_set);
1416 void nft_unregister_set(struct nft_set_ops *ops)
1418 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1419 list_del(&ops->list);
1420 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1422 EXPORT_SYMBOL_GPL(nft_unregister_set);
1424 static const struct nft_set_ops *nft_select_set_ops(const struct nlattr * const nla[])
1426 const struct nft_set_ops *ops;
1429 #ifdef CONFIG_MODULES
1430 if (list_empty(&nf_tables_set_ops)) {
1431 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1432 request_module("nft-set");
1433 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1434 if (!list_empty(&nf_tables_set_ops))
1435 return ERR_PTR(-EAGAIN);
1439 if (nla[NFTA_SET_FLAGS] != NULL) {
1440 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
1441 features &= NFT_SET_INTERVAL | NFT_SET_MAP;
1444 // FIXME: implement selection properly
1445 list_for_each_entry(ops, &nf_tables_set_ops, list) {
1446 if ((ops->features & features) != features)
1448 if (!try_module_get(ops->owner))
1453 return ERR_PTR(-EOPNOTSUPP);
1456 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
1457 [NFTA_SET_TABLE] = { .type = NLA_STRING },
1458 [NFTA_SET_NAME] = { .type = NLA_STRING },
1459 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
1460 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
1461 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
1462 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
1463 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
1466 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx,
1467 const struct sk_buff *skb,
1468 const struct nlmsghdr *nlh,
1469 const struct nlattr * const nla[])
1471 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1472 const struct nft_af_info *afi;
1473 const struct nft_table *table = NULL;
1475 afi = nf_tables_afinfo_lookup(nfmsg->nfgen_family, false);
1477 return PTR_ERR(afi);
1479 if (nla[NFTA_SET_TABLE] != NULL) {
1480 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], false);
1482 return PTR_ERR(table);
1485 nft_ctx_init(ctx, skb, nlh, afi, table, NULL);
1489 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
1490 const struct nlattr *nla)
1492 struct nft_set *set;
1495 return ERR_PTR(-EINVAL);
1497 list_for_each_entry(set, &table->sets, list) {
1498 if (!nla_strcmp(nla, set->name))
1501 return ERR_PTR(-ENOENT);
1504 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
1507 const struct nft_set *i;
1509 unsigned long *inuse;
1512 p = strnchr(name, IFNAMSIZ, '%');
1514 if (p[1] != 'd' || strchr(p + 2, '%'))
1517 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
1521 list_for_each_entry(i, &ctx->table->sets, list) {
1522 if (!sscanf(i->name, name, &n))
1524 if (n < 0 || n > BITS_PER_LONG * PAGE_SIZE)
1529 n = find_first_zero_bit(inuse, BITS_PER_LONG * PAGE_SIZE);
1530 free_page((unsigned long)inuse);
1533 snprintf(set->name, sizeof(set->name), name, n);
1534 list_for_each_entry(i, &ctx->table->sets, list) {
1535 if (!strcmp(set->name, i->name))
1541 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
1542 const struct nft_set *set, u16 event, u16 flags)
1544 struct nfgenmsg *nfmsg;
1545 struct nlmsghdr *nlh;
1546 u32 portid = NETLINK_CB(ctx->skb).portid;
1547 u32 seq = ctx->nlh->nlmsg_seq;
1549 event |= NFNL_SUBSYS_NFTABLES << 8;
1550 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
1553 goto nla_put_failure;
1555 nfmsg = nlmsg_data(nlh);
1556 nfmsg->nfgen_family = ctx->afi->family;
1557 nfmsg->version = NFNETLINK_V0;
1560 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
1561 goto nla_put_failure;
1562 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
1563 goto nla_put_failure;
1564 if (set->flags != 0)
1565 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
1566 goto nla_put_failure;
1568 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
1569 goto nla_put_failure;
1570 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
1571 goto nla_put_failure;
1572 if (set->flags & NFT_SET_MAP) {
1573 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
1574 goto nla_put_failure;
1575 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
1576 goto nla_put_failure;
1579 return nlmsg_end(skb, nlh);
1582 nlmsg_trim(skb, nlh);
1586 static int nf_tables_set_notify(const struct nft_ctx *ctx,
1587 const struct nft_set *set,
1590 struct sk_buff *skb;
1591 u32 portid = NETLINK_CB(ctx->skb).portid;
1592 struct net *net = sock_net(ctx->skb->sk);
1596 report = nlmsg_report(ctx->nlh);
1597 if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
1601 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1605 err = nf_tables_fill_set(skb, ctx, set, event, 0);
1611 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report,
1615 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
1619 static int nf_tables_dump_sets_table(struct nft_ctx *ctx, struct sk_buff *skb,
1620 struct netlink_callback *cb)
1622 const struct nft_set *set;
1623 unsigned int idx = 0, s_idx = cb->args[0];
1628 list_for_each_entry(set, &ctx->table->sets, list) {
1631 if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET,
1644 static int nf_tables_dump_sets_all(struct nft_ctx *ctx, struct sk_buff *skb,
1645 struct netlink_callback *cb)
1647 const struct nft_set *set;
1648 unsigned int idx = 0, s_idx = cb->args[0];
1649 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
1654 list_for_each_entry(table, &ctx->afi->tables, list) {
1655 if (cur_table && cur_table != table)
1659 list_for_each_entry(set, &ctx->table->sets, list) {
1662 if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET,
1665 cb->args[2] = (unsigned long) table;
1677 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
1679 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1680 struct nlattr *nla[NFTA_SET_MAX + 1];
1684 err = nlmsg_parse(cb->nlh, sizeof(*nfmsg), nla, NFTA_SET_MAX,
1689 err = nft_ctx_init_from_setattr(&ctx, cb->skb, cb->nlh, (void *)nla);
1693 if (ctx.table == NULL)
1694 ret = nf_tables_dump_sets_all(&ctx, skb, cb);
1696 ret = nf_tables_dump_sets_table(&ctx, skb, cb);
1701 static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
1702 const struct nlmsghdr *nlh,
1703 const struct nlattr * const nla[])
1705 const struct nft_set *set;
1707 struct sk_buff *skb2;
1710 /* Verify existance before starting dump */
1711 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
1715 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1716 struct netlink_dump_control c = {
1717 .dump = nf_tables_dump_sets,
1719 return netlink_dump_start(nlsk, skb, nlh, &c);
1722 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
1724 return PTR_ERR(set);
1726 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1730 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
1734 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1741 static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
1742 const struct nlmsghdr *nlh,
1743 const struct nlattr * const nla[])
1745 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1746 const struct nft_set_ops *ops;
1747 const struct nft_af_info *afi;
1748 struct nft_table *table;
1749 struct nft_set *set;
1751 char name[IFNAMSIZ];
1754 u32 ktype, klen, dlen, dtype, flags;
1757 if (nla[NFTA_SET_TABLE] == NULL ||
1758 nla[NFTA_SET_NAME] == NULL ||
1759 nla[NFTA_SET_KEY_LEN] == NULL)
1762 ktype = NFT_DATA_VALUE;
1763 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
1764 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
1765 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
1769 klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
1770 if (klen == 0 || klen > FIELD_SIZEOF(struct nft_data, data))
1774 if (nla[NFTA_SET_FLAGS] != NULL) {
1775 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
1776 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
1777 NFT_SET_INTERVAL | NFT_SET_MAP))
1783 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
1784 if (!(flags & NFT_SET_MAP))
1787 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
1788 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
1789 dtype != NFT_DATA_VERDICT)
1792 if (dtype != NFT_DATA_VERDICT) {
1793 if (nla[NFTA_SET_DATA_LEN] == NULL)
1795 dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
1797 dlen > FIELD_SIZEOF(struct nft_data, data))
1800 dlen = sizeof(struct nft_data);
1801 } else if (flags & NFT_SET_MAP)
1804 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1806 afi = nf_tables_afinfo_lookup(nfmsg->nfgen_family, create);
1808 return PTR_ERR(afi);
1810 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], create);
1812 return PTR_ERR(table);
1814 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL);
1816 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
1818 if (PTR_ERR(set) != -ENOENT)
1819 return PTR_ERR(set);
1824 if (nlh->nlmsg_flags & NLM_F_EXCL)
1826 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1831 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1834 ops = nft_select_set_ops(nla);
1836 return PTR_ERR(ops);
1839 if (ops->privsize != NULL)
1840 size = ops->privsize(nla);
1843 set = kzalloc(sizeof(*set) + size, GFP_KERNEL);
1847 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
1848 err = nf_tables_set_alloc_name(&ctx, set, name);
1852 INIT_LIST_HEAD(&set->bindings);
1860 err = ops->init(set, nla);
1864 list_add_tail(&set->list, &table->sets);
1865 nf_tables_set_notify(&ctx, set, NFT_MSG_NEWSET);
1871 module_put(ops->owner);
1875 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
1877 list_del(&set->list);
1878 if (!(set->flags & NFT_SET_ANONYMOUS))
1879 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET);
1881 set->ops->destroy(set);
1882 module_put(set->ops->owner);
1886 static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
1887 const struct nlmsghdr *nlh,
1888 const struct nlattr * const nla[])
1890 struct nft_set *set;
1894 if (nla[NFTA_SET_TABLE] == NULL)
1897 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
1901 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
1903 return PTR_ERR(set);
1904 if (!list_empty(&set->bindings))
1907 nf_tables_set_destroy(&ctx, set);
1911 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
1912 const struct nft_set *set,
1913 const struct nft_set_iter *iter,
1914 const struct nft_set_elem *elem)
1916 enum nft_registers dreg;
1918 dreg = nft_type_to_reg(set->dtype);
1919 return nft_validate_data_load(ctx, dreg, &elem->data, set->dtype);
1922 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
1923 struct nft_set_binding *binding)
1925 struct nft_set_binding *i;
1926 struct nft_set_iter iter;
1928 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
1931 if (set->flags & NFT_SET_MAP) {
1932 /* If the set is already bound to the same chain all
1933 * jumps are already validated for that chain.
1935 list_for_each_entry(i, &set->bindings, list) {
1936 if (i->chain == binding->chain)
1943 iter.fn = nf_tables_bind_check_setelem;
1945 set->ops->walk(ctx, set, &iter);
1947 /* Destroy anonymous sets if binding fails */
1948 if (set->flags & NFT_SET_ANONYMOUS)
1949 nf_tables_set_destroy(ctx, set);
1955 binding->chain = ctx->chain;
1956 list_add_tail(&binding->list, &set->bindings);
1960 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
1961 struct nft_set_binding *binding)
1963 list_del(&binding->list);
1965 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
1966 nf_tables_set_destroy(ctx, set);
1973 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
1974 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
1975 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
1976 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
1979 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
1980 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
1981 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
1982 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
1985 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx,
1986 const struct sk_buff *skb,
1987 const struct nlmsghdr *nlh,
1988 const struct nlattr * const nla[])
1990 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1991 const struct nft_af_info *afi;
1992 const struct nft_table *table;
1994 afi = nf_tables_afinfo_lookup(nfmsg->nfgen_family, false);
1996 return PTR_ERR(afi);
1998 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE], false);
2000 return PTR_ERR(table);
2002 nft_ctx_init(ctx, skb, nlh, afi, table, NULL);
2006 static int nf_tables_fill_setelem(struct sk_buff *skb,
2007 const struct nft_set *set,
2008 const struct nft_set_elem *elem)
2010 unsigned char *b = skb_tail_pointer(skb);
2011 struct nlattr *nest;
2013 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
2015 goto nla_put_failure;
2017 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE,
2019 goto nla_put_failure;
2021 if (set->flags & NFT_SET_MAP &&
2022 !(elem->flags & NFT_SET_ELEM_INTERVAL_END) &&
2023 nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data,
2024 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
2026 goto nla_put_failure;
2028 if (elem->flags != 0)
2029 if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags)))
2030 goto nla_put_failure;
2032 nla_nest_end(skb, nest);
2040 struct nft_set_dump_args {
2041 const struct netlink_callback *cb;
2042 struct nft_set_iter iter;
2043 struct sk_buff *skb;
2046 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
2047 const struct nft_set *set,
2048 const struct nft_set_iter *iter,
2049 const struct nft_set_elem *elem)
2051 struct nft_set_dump_args *args;
2053 args = container_of(iter, struct nft_set_dump_args, iter);
2054 return nf_tables_fill_setelem(args->skb, set, elem);
2057 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
2059 const struct nft_set *set;
2060 struct nft_set_dump_args args;
2062 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
2063 struct nfgenmsg *nfmsg;
2064 struct nlmsghdr *nlh;
2065 struct nlattr *nest;
2069 nfmsg = nlmsg_data(cb->nlh);
2070 err = nlmsg_parse(cb->nlh, sizeof(*nfmsg), nla, NFTA_SET_ELEM_LIST_MAX,
2071 nft_set_elem_list_policy);
2075 err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla);
2079 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2081 return PTR_ERR(set);
2083 event = NFT_MSG_NEWSETELEM;
2084 event |= NFNL_SUBSYS_NFTABLES << 8;
2085 portid = NETLINK_CB(cb->skb).portid;
2086 seq = cb->nlh->nlmsg_seq;
2088 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2091 goto nla_put_failure;
2093 nfmsg = nlmsg_data(nlh);
2094 nfmsg->nfgen_family = NFPROTO_UNSPEC;
2095 nfmsg->version = NFNETLINK_V0;
2098 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
2099 goto nla_put_failure;
2100 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
2101 goto nla_put_failure;
2103 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2105 goto nla_put_failure;
2109 args.iter.skip = cb->args[0];
2110 args.iter.count = 0;
2112 args.iter.fn = nf_tables_dump_setelem;
2113 set->ops->walk(&ctx, set, &args.iter);
2115 nla_nest_end(skb, nest);
2116 nlmsg_end(skb, nlh);
2118 if (args.iter.err && args.iter.err != -EMSGSIZE)
2119 return args.iter.err;
2120 if (args.iter.count == cb->args[0])
2123 cb->args[0] = args.iter.count;
2130 static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb,
2131 const struct nlmsghdr *nlh,
2132 const struct nlattr * const nla[])
2134 const struct nft_set *set;
2138 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla);
2142 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2144 return PTR_ERR(set);
2146 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2147 struct netlink_dump_control c = {
2148 .dump = nf_tables_dump_set,
2150 return netlink_dump_start(nlsk, skb, nlh, &c);
2155 static int nft_add_set_elem(const struct nft_ctx *ctx, struct nft_set *set,
2156 const struct nlattr *attr)
2158 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
2159 struct nft_data_desc d1, d2;
2160 struct nft_set_elem elem;
2161 struct nft_set_binding *binding;
2162 enum nft_registers dreg;
2165 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
2166 nft_set_elem_policy);
2170 if (nla[NFTA_SET_ELEM_KEY] == NULL)
2174 if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
2175 elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
2176 if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END)
2180 if (set->flags & NFT_SET_MAP) {
2181 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
2182 !(elem.flags & NFT_SET_ELEM_INTERVAL_END))
2185 if (nla[NFTA_SET_ELEM_DATA] != NULL)
2189 err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]);
2193 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
2197 if (set->ops->get(set, &elem) == 0)
2200 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
2201 err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]);
2206 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
2209 dreg = nft_type_to_reg(set->dtype);
2210 list_for_each_entry(binding, &set->bindings, list) {
2211 struct nft_ctx bind_ctx = {
2213 .table = ctx->table,
2214 .chain = binding->chain,
2217 err = nft_validate_data_load(&bind_ctx, dreg,
2218 &elem.data, d2.type);
2224 err = set->ops->insert(set, &elem);
2231 if (nla[NFTA_SET_ELEM_DATA] != NULL)
2232 nft_data_uninit(&elem.data, d2.type);
2234 nft_data_uninit(&elem.key, d1.type);
2239 static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb,
2240 const struct nlmsghdr *nlh,
2241 const struct nlattr * const nla[])
2243 const struct nlattr *attr;
2244 struct nft_set *set;
2248 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla);
2252 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2254 return PTR_ERR(set);
2255 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
2258 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
2259 err = nft_add_set_elem(&ctx, set, attr);
2266 static int nft_del_setelem(const struct nft_ctx *ctx, struct nft_set *set,
2267 const struct nlattr *attr)
2269 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
2270 struct nft_data_desc desc;
2271 struct nft_set_elem elem;
2274 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
2275 nft_set_elem_policy);
2280 if (nla[NFTA_SET_ELEM_KEY] == NULL)
2283 err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]);
2288 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
2291 err = set->ops->get(set, &elem);
2295 set->ops->remove(set, &elem);
2297 nft_data_uninit(&elem.key, NFT_DATA_VALUE);
2298 if (set->flags & NFT_SET_MAP)
2299 nft_data_uninit(&elem.data, set->dtype);
2302 nft_data_uninit(&elem.key, desc.type);
2307 static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb,
2308 const struct nlmsghdr *nlh,
2309 const struct nlattr * const nla[])
2311 const struct nlattr *attr;
2312 struct nft_set *set;
2316 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla);
2320 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2322 return PTR_ERR(set);
2323 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
2326 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
2327 err = nft_del_setelem(&ctx, set, attr);
2334 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
2335 [NFT_MSG_NEWTABLE] = {
2336 .call = nf_tables_newtable,
2337 .attr_count = NFTA_TABLE_MAX,
2338 .policy = nft_table_policy,
2340 [NFT_MSG_GETTABLE] = {
2341 .call = nf_tables_gettable,
2342 .attr_count = NFTA_TABLE_MAX,
2343 .policy = nft_table_policy,
2345 [NFT_MSG_DELTABLE] = {
2346 .call = nf_tables_deltable,
2347 .attr_count = NFTA_TABLE_MAX,
2348 .policy = nft_table_policy,
2350 [NFT_MSG_NEWCHAIN] = {
2351 .call = nf_tables_newchain,
2352 .attr_count = NFTA_CHAIN_MAX,
2353 .policy = nft_chain_policy,
2355 [NFT_MSG_GETCHAIN] = {
2356 .call = nf_tables_getchain,
2357 .attr_count = NFTA_CHAIN_MAX,
2358 .policy = nft_chain_policy,
2360 [NFT_MSG_DELCHAIN] = {
2361 .call = nf_tables_delchain,
2362 .attr_count = NFTA_CHAIN_MAX,
2363 .policy = nft_chain_policy,
2365 [NFT_MSG_NEWRULE] = {
2366 .call = nf_tables_newrule,
2367 .attr_count = NFTA_RULE_MAX,
2368 .policy = nft_rule_policy,
2370 [NFT_MSG_GETRULE] = {
2371 .call = nf_tables_getrule,
2372 .attr_count = NFTA_RULE_MAX,
2373 .policy = nft_rule_policy,
2375 [NFT_MSG_DELRULE] = {
2376 .call = nf_tables_delrule,
2377 .attr_count = NFTA_RULE_MAX,
2378 .policy = nft_rule_policy,
2380 [NFT_MSG_NEWSET] = {
2381 .call = nf_tables_newset,
2382 .attr_count = NFTA_SET_MAX,
2383 .policy = nft_set_policy,
2385 [NFT_MSG_GETSET] = {
2386 .call = nf_tables_getset,
2387 .attr_count = NFTA_SET_MAX,
2388 .policy = nft_set_policy,
2390 [NFT_MSG_DELSET] = {
2391 .call = nf_tables_delset,
2392 .attr_count = NFTA_SET_MAX,
2393 .policy = nft_set_policy,
2395 [NFT_MSG_NEWSETELEM] = {
2396 .call = nf_tables_newsetelem,
2397 .attr_count = NFTA_SET_ELEM_LIST_MAX,
2398 .policy = nft_set_elem_list_policy,
2400 [NFT_MSG_GETSETELEM] = {
2401 .call = nf_tables_getsetelem,
2402 .attr_count = NFTA_SET_ELEM_LIST_MAX,
2403 .policy = nft_set_elem_list_policy,
2405 [NFT_MSG_DELSETELEM] = {
2406 .call = nf_tables_delsetelem,
2407 .attr_count = NFTA_SET_ELEM_LIST_MAX,
2408 .policy = nft_set_elem_list_policy,
2412 static const struct nfnetlink_subsystem nf_tables_subsys = {
2413 .name = "nf_tables",
2414 .subsys_id = NFNL_SUBSYS_NFTABLES,
2415 .cb_count = NFT_MSG_MAX,
2420 * Loop detection - walk through the ruleset beginning at the destination chain
2421 * of a new jump until either the source chain is reached (loop) or all
2422 * reachable chains have been traversed.
2424 * The loop check is performed whenever a new jump verdict is added to an
2425 * expression or verdict map or a verdict map is bound to a new chain.
2428 static int nf_tables_check_loops(const struct nft_ctx *ctx,
2429 const struct nft_chain *chain);
2431 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
2432 const struct nft_set *set,
2433 const struct nft_set_iter *iter,
2434 const struct nft_set_elem *elem)
2436 switch (elem->data.verdict) {
2439 return nf_tables_check_loops(ctx, elem->data.chain);
2445 static int nf_tables_check_loops(const struct nft_ctx *ctx,
2446 const struct nft_chain *chain)
2448 const struct nft_rule *rule;
2449 const struct nft_expr *expr, *last;
2450 const struct nft_data *data;
2451 const struct nft_set *set;
2452 struct nft_set_binding *binding;
2453 struct nft_set_iter iter;
2456 if (ctx->chain == chain)
2459 list_for_each_entry(rule, &chain->rules, list) {
2460 nft_rule_for_each_expr(expr, last, rule) {
2461 if (!expr->ops->get_verdict)
2464 data = expr->ops->get_verdict(expr);
2468 switch (data->verdict) {
2471 err = nf_tables_check_loops(ctx, data->chain);
2480 list_for_each_entry(set, &ctx->table->sets, list) {
2481 if (!(set->flags & NFT_SET_MAP) ||
2482 set->dtype != NFT_DATA_VERDICT)
2485 list_for_each_entry(binding, &set->bindings, list) {
2486 if (binding->chain != chain)
2492 iter.fn = nf_tables_loop_check_setelem;
2494 set->ops->walk(ctx, set, &iter);
2504 * nft_validate_input_register - validate an expressions' input register
2506 * @reg: the register number
2508 * Validate that the input register is one of the general purpose
2511 int nft_validate_input_register(enum nft_registers reg)
2513 if (reg <= NFT_REG_VERDICT)
2515 if (reg > NFT_REG_MAX)
2519 EXPORT_SYMBOL_GPL(nft_validate_input_register);
2522 * nft_validate_output_register - validate an expressions' output register
2524 * @reg: the register number
2526 * Validate that the output register is one of the general purpose
2527 * registers or the verdict register.
2529 int nft_validate_output_register(enum nft_registers reg)
2531 if (reg < NFT_REG_VERDICT)
2533 if (reg > NFT_REG_MAX)
2537 EXPORT_SYMBOL_GPL(nft_validate_output_register);
2540 * nft_validate_data_load - validate an expressions' data load
2542 * @ctx: context of the expression performing the load
2543 * @reg: the destination register number
2544 * @data: the data to load
2545 * @type: the data type
2547 * Validate that a data load uses the appropriate data type for
2548 * the destination register. A value of NULL for the data means
2549 * that its runtime gathered data, which is always of type
2552 int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg,
2553 const struct nft_data *data,
2554 enum nft_data_types type)
2559 case NFT_REG_VERDICT:
2560 if (data == NULL || type != NFT_DATA_VERDICT)
2563 if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) {
2564 err = nf_tables_check_loops(ctx, data->chain);
2568 if (ctx->chain->level + 1 > data->chain->level) {
2569 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
2571 data->chain->level = ctx->chain->level + 1;
2577 if (data != NULL && type != NFT_DATA_VALUE)
2582 EXPORT_SYMBOL_GPL(nft_validate_data_load);
2584 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
2585 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
2586 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
2587 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2590 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
2591 struct nft_data_desc *desc, const struct nlattr *nla)
2593 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
2594 struct nft_chain *chain;
2597 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
2601 if (!tb[NFTA_VERDICT_CODE])
2603 data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
2605 switch (data->verdict) {
2612 desc->len = sizeof(data->verdict);
2616 if (!tb[NFTA_VERDICT_CHAIN])
2618 chain = nf_tables_chain_lookup(ctx->table,
2619 tb[NFTA_VERDICT_CHAIN]);
2621 return PTR_ERR(chain);
2622 if (chain->flags & NFT_BASE_CHAIN)
2626 data->chain = chain;
2627 desc->len = sizeof(data);
2633 desc->type = NFT_DATA_VERDICT;
2637 static void nft_verdict_uninit(const struct nft_data *data)
2639 switch (data->verdict) {
2647 static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data)
2649 struct nlattr *nest;
2651 nest = nla_nest_start(skb, NFTA_DATA_VERDICT);
2653 goto nla_put_failure;
2655 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict)))
2656 goto nla_put_failure;
2658 switch (data->verdict) {
2661 if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name))
2662 goto nla_put_failure;
2664 nla_nest_end(skb, nest);
2671 static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data,
2672 struct nft_data_desc *desc, const struct nlattr *nla)
2679 if (len > sizeof(data->data))
2682 nla_memcpy(data->data, nla, sizeof(data->data));
2683 desc->type = NFT_DATA_VALUE;
2688 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
2691 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
2694 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
2695 [NFTA_DATA_VALUE] = { .type = NLA_BINARY,
2696 .len = FIELD_SIZEOF(struct nft_data, data) },
2697 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
2701 * nft_data_init - parse nf_tables data netlink attributes
2703 * @ctx: context of the expression using the data
2704 * @data: destination struct nft_data
2705 * @desc: data description
2706 * @nla: netlink attribute containing data
2708 * Parse the netlink data attributes and initialize a struct nft_data.
2709 * The type and length of data are returned in the data description.
2711 * The caller can indicate that it only wants to accept data of type
2712 * NFT_DATA_VALUE by passing NULL for the ctx argument.
2714 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
2715 struct nft_data_desc *desc, const struct nlattr *nla)
2717 struct nlattr *tb[NFTA_DATA_MAX + 1];
2720 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
2724 if (tb[NFTA_DATA_VALUE])
2725 return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
2726 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
2727 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
2730 EXPORT_SYMBOL_GPL(nft_data_init);
2733 * nft_data_uninit - release a nft_data item
2735 * @data: struct nft_data to release
2736 * @type: type of data
2738 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
2739 * all others need to be released by calling this function.
2741 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
2744 case NFT_DATA_VALUE:
2746 case NFT_DATA_VERDICT:
2747 return nft_verdict_uninit(data);
2752 EXPORT_SYMBOL_GPL(nft_data_uninit);
2754 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
2755 enum nft_data_types type, unsigned int len)
2757 struct nlattr *nest;
2760 nest = nla_nest_start(skb, attr);
2765 case NFT_DATA_VALUE:
2766 err = nft_value_dump(skb, data, len);
2768 case NFT_DATA_VERDICT:
2769 err = nft_verdict_dump(skb, data);
2776 nla_nest_end(skb, nest);
2779 EXPORT_SYMBOL_GPL(nft_data_dump);
2781 static int __init nf_tables_module_init(void)
2785 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
2792 err = nf_tables_core_module_init();
2796 err = nfnetlink_subsys_register(&nf_tables_subsys);
2800 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
2803 nf_tables_core_module_exit();
2810 static void __exit nf_tables_module_exit(void)
2812 nfnetlink_subsys_unregister(&nf_tables_subsys);
2813 nf_tables_core_module_exit();
2817 module_init(nf_tables_module_init);
2818 module_exit(nf_tables_module_exit);
2820 MODULE_LICENSE("GPL");
2821 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
2822 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);