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>
21 #include <net/net_namespace.h>
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 net *net, struct nft_af_info *afi)
36 INIT_LIST_HEAD(&afi->tables);
37 nfnl_lock(NFNL_SUBSYS_NFTABLES);
38 list_add_tail_rcu(&afi->list, &net->nft.af_info);
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);
54 list_del_rcu(&afi->list);
55 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
57 EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
59 static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
61 struct nft_af_info *afi;
63 list_for_each_entry(afi, &net->nft.af_info, list) {
64 if (afi->family == family)
70 static struct nft_af_info *
71 nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
73 struct nft_af_info *afi;
75 afi = nft_afinfo_lookup(net, family);
80 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
81 request_module("nft-afinfo-%u", family);
82 nfnl_lock(NFNL_SUBSYS_NFTABLES);
83 afi = nft_afinfo_lookup(net, family);
85 return ERR_PTR(-EAGAIN);
88 return ERR_PTR(-EAFNOSUPPORT);
91 static void nft_ctx_init(struct nft_ctx *ctx,
92 const struct sk_buff *skb,
93 const struct nlmsghdr *nlh,
94 struct nft_af_info *afi,
95 struct nft_table *table,
96 struct nft_chain *chain,
97 const struct nlattr * const *nla)
99 ctx->net = sock_net(skb->sk);
104 ctx->portid = NETLINK_CB(skb).portid;
105 ctx->report = nlmsg_report(nlh);
106 ctx->seq = nlh->nlmsg_seq;
109 static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type,
112 struct nft_trans *trans;
114 trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL);
118 trans->msg_type = msg_type;
124 static void nft_trans_destroy(struct nft_trans *trans)
126 list_del(&trans->list);
130 int nft_register_basechain(struct nft_base_chain *basechain,
131 unsigned int hook_nops)
133 struct net *net = read_pnet(&basechain->pnet);
135 if (basechain->flags & NFT_BASECHAIN_DISABLED)
138 return nf_register_net_hooks(net, basechain->ops, hook_nops);
140 EXPORT_SYMBOL_GPL(nft_register_basechain);
142 void nft_unregister_basechain(struct nft_base_chain *basechain,
143 unsigned int hook_nops)
145 struct net *net = read_pnet(&basechain->pnet);
147 if (basechain->flags & NFT_BASECHAIN_DISABLED)
150 nf_unregister_net_hooks(net, basechain->ops, hook_nops);
152 EXPORT_SYMBOL_GPL(nft_unregister_basechain);
154 static int nf_tables_register_hooks(const struct nft_table *table,
155 struct nft_chain *chain,
156 unsigned int hook_nops)
158 if (table->flags & NFT_TABLE_F_DORMANT ||
159 !(chain->flags & NFT_BASE_CHAIN))
162 return nft_register_basechain(nft_base_chain(chain), hook_nops);
165 static void nf_tables_unregister_hooks(const struct nft_table *table,
166 struct nft_chain *chain,
167 unsigned int hook_nops)
169 if (table->flags & NFT_TABLE_F_DORMANT ||
170 !(chain->flags & NFT_BASE_CHAIN))
173 nft_unregister_basechain(nft_base_chain(chain), hook_nops);
176 /* Internal table flags */
177 #define NFT_TABLE_INACTIVE (1 << 15)
179 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
181 struct nft_trans *trans;
183 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
187 if (msg_type == NFT_MSG_NEWTABLE)
188 ctx->table->flags |= NFT_TABLE_INACTIVE;
190 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
194 static int nft_deltable(struct nft_ctx *ctx)
198 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
202 list_del_rcu(&ctx->table->list);
206 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
208 struct nft_trans *trans;
210 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
214 if (msg_type == NFT_MSG_NEWCHAIN)
215 ctx->chain->flags |= NFT_CHAIN_INACTIVE;
217 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
221 static int nft_delchain(struct nft_ctx *ctx)
225 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
230 list_del_rcu(&ctx->chain->list);
236 nft_rule_is_active(struct net *net, const struct nft_rule *rule)
238 return (rule->genmask & nft_genmask_cur(net)) == 0;
242 nft_rule_is_active_next(struct net *net, const struct nft_rule *rule)
244 return (rule->genmask & nft_genmask_next(net)) == 0;
248 nft_rule_activate_next(struct net *net, struct nft_rule *rule)
250 /* Now inactive, will be active in the future */
251 rule->genmask = nft_genmask_cur(net);
255 nft_rule_deactivate_next(struct net *net, struct nft_rule *rule)
257 rule->genmask = nft_genmask_next(net);
260 static inline void nft_rule_clear(struct net *net, struct nft_rule *rule)
262 rule->genmask &= ~nft_genmask_next(net);
266 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
268 /* You cannot delete the same rule twice */
269 if (nft_rule_is_active_next(ctx->net, rule)) {
270 nft_rule_deactivate_next(ctx->net, rule);
277 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
278 struct nft_rule *rule)
280 struct nft_trans *trans;
282 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
286 nft_trans_rule(trans) = rule;
287 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
292 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
294 struct nft_trans *trans;
297 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
301 err = nf_tables_delrule_deactivate(ctx, rule);
303 nft_trans_destroy(trans);
310 static int nft_delrule_by_chain(struct nft_ctx *ctx)
312 struct nft_rule *rule;
315 list_for_each_entry(rule, &ctx->chain->rules, list) {
316 err = nft_delrule(ctx, rule);
323 /* Internal set flag */
324 #define NFT_SET_INACTIVE (1 << 15)
326 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
329 struct nft_trans *trans;
331 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
335 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
336 nft_trans_set_id(trans) =
337 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
338 set->flags |= NFT_SET_INACTIVE;
340 nft_trans_set(trans) = set;
341 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
346 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
350 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
354 list_del_rcu(&set->list);
364 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
365 const struct nlattr *nla)
367 struct nft_table *table;
369 list_for_each_entry(table, &afi->tables, list) {
370 if (!nla_strcmp(nla, table->name))
376 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
377 const struct nlattr *nla)
379 struct nft_table *table;
382 return ERR_PTR(-EINVAL);
384 table = nft_table_lookup(afi, nla);
388 return ERR_PTR(-ENOENT);
391 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
393 return ++table->hgenerator;
396 static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
398 static const struct nf_chain_type *
399 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
403 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
404 if (chain_type[family][i] != NULL &&
405 !nla_strcmp(nla, chain_type[family][i]->name))
406 return chain_type[family][i];
411 static const struct nf_chain_type *
412 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
413 const struct nlattr *nla,
416 const struct nf_chain_type *type;
418 type = __nf_tables_chain_type_lookup(afi->family, nla);
421 #ifdef CONFIG_MODULES
423 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
424 request_module("nft-chain-%u-%.*s", afi->family,
425 nla_len(nla), (const char *)nla_data(nla));
426 nfnl_lock(NFNL_SUBSYS_NFTABLES);
427 type = __nf_tables_chain_type_lookup(afi->family, nla);
429 return ERR_PTR(-EAGAIN);
432 return ERR_PTR(-ENOENT);
435 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
436 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
437 .len = NFT_TABLE_MAXNAMELEN - 1 },
438 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
441 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
442 u32 portid, u32 seq, int event, u32 flags,
443 int family, const struct nft_table *table)
445 struct nlmsghdr *nlh;
446 struct nfgenmsg *nfmsg;
448 event |= NFNL_SUBSYS_NFTABLES << 8;
449 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
451 goto nla_put_failure;
453 nfmsg = nlmsg_data(nlh);
454 nfmsg->nfgen_family = family;
455 nfmsg->version = NFNETLINK_V0;
456 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
458 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
459 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
460 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
461 goto nla_put_failure;
467 nlmsg_trim(skb, nlh);
471 static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
477 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
481 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
485 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
486 event, 0, ctx->afi->family, ctx->table);
492 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
493 ctx->report, GFP_KERNEL);
496 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
502 static int nf_tables_dump_tables(struct sk_buff *skb,
503 struct netlink_callback *cb)
505 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
506 const struct nft_af_info *afi;
507 const struct nft_table *table;
508 unsigned int idx = 0, s_idx = cb->args[0];
509 struct net *net = sock_net(skb->sk);
510 int family = nfmsg->nfgen_family;
513 cb->seq = net->nft.base_seq;
515 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
516 if (family != NFPROTO_UNSPEC && family != afi->family)
519 list_for_each_entry_rcu(table, &afi->tables, list) {
523 memset(&cb->args[1], 0,
524 sizeof(cb->args) - sizeof(cb->args[0]));
525 if (nf_tables_fill_table_info(skb, net,
526 NETLINK_CB(cb->skb).portid,
530 afi->family, table) < 0)
533 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
544 static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb,
545 const struct nlmsghdr *nlh,
546 const struct nlattr * const nla[])
548 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
549 const struct nft_af_info *afi;
550 const struct nft_table *table;
551 struct sk_buff *skb2;
552 struct net *net = sock_net(skb->sk);
553 int family = nfmsg->nfgen_family;
556 if (nlh->nlmsg_flags & NLM_F_DUMP) {
557 struct netlink_dump_control c = {
558 .dump = nf_tables_dump_tables,
560 return netlink_dump_start(nlsk, skb, nlh, &c);
563 afi = nf_tables_afinfo_lookup(net, family, false);
567 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
569 return PTR_ERR(table);
570 if (table->flags & NFT_TABLE_INACTIVE)
573 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
577 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
578 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
583 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
590 static int nf_tables_table_enable(const struct nft_af_info *afi,
591 struct nft_table *table)
593 struct nft_chain *chain;
596 list_for_each_entry(chain, &table->chains, list) {
597 if (!(chain->flags & NFT_BASE_CHAIN))
600 err = nft_register_basechain(nft_base_chain(chain), afi->nops);
608 list_for_each_entry(chain, &table->chains, list) {
609 if (!(chain->flags & NFT_BASE_CHAIN))
615 nft_unregister_basechain(nft_base_chain(chain), afi->nops);
620 static void nf_tables_table_disable(const struct nft_af_info *afi,
621 struct nft_table *table)
623 struct nft_chain *chain;
625 list_for_each_entry(chain, &table->chains, list) {
626 if (chain->flags & NFT_BASE_CHAIN)
627 nft_unregister_basechain(nft_base_chain(chain),
632 static int nf_tables_updtable(struct nft_ctx *ctx)
634 struct nft_trans *trans;
638 if (!ctx->nla[NFTA_TABLE_FLAGS])
641 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
642 if (flags & ~NFT_TABLE_F_DORMANT)
645 if (flags == ctx->table->flags)
648 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
649 sizeof(struct nft_trans_table));
653 if ((flags & NFT_TABLE_F_DORMANT) &&
654 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
655 nft_trans_table_enable(trans) = false;
656 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
657 ctx->table->flags & NFT_TABLE_F_DORMANT) {
658 ret = nf_tables_table_enable(ctx->afi, ctx->table);
660 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
661 nft_trans_table_enable(trans) = true;
667 nft_trans_table_update(trans) = true;
668 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
671 nft_trans_destroy(trans);
675 static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
676 const struct nlmsghdr *nlh,
677 const struct nlattr * const nla[])
679 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
680 const struct nlattr *name;
681 struct nft_af_info *afi;
682 struct nft_table *table;
683 struct net *net = sock_net(skb->sk);
684 int family = nfmsg->nfgen_family;
689 afi = nf_tables_afinfo_lookup(net, family, true);
693 name = nla[NFTA_TABLE_NAME];
694 table = nf_tables_table_lookup(afi, name);
696 if (PTR_ERR(table) != -ENOENT)
697 return PTR_ERR(table);
702 if (table->flags & NFT_TABLE_INACTIVE)
704 if (nlh->nlmsg_flags & NLM_F_EXCL)
706 if (nlh->nlmsg_flags & NLM_F_REPLACE)
709 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
710 return nf_tables_updtable(&ctx);
713 if (nla[NFTA_TABLE_FLAGS]) {
714 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
715 if (flags & ~NFT_TABLE_F_DORMANT)
720 if (!try_module_get(afi->owner))
724 table = kzalloc(sizeof(*table), GFP_KERNEL);
728 nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
729 INIT_LIST_HEAD(&table->chains);
730 INIT_LIST_HEAD(&table->sets);
731 table->flags = flags;
733 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
734 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
738 list_add_tail_rcu(&table->list, &afi->tables);
743 module_put(afi->owner);
748 static int nft_flush_table(struct nft_ctx *ctx)
751 struct nft_chain *chain, *nc;
752 struct nft_set *set, *ns;
754 list_for_each_entry(chain, &ctx->table->chains, list) {
757 err = nft_delrule_by_chain(ctx);
762 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
763 if (set->flags & NFT_SET_ANONYMOUS &&
764 !list_empty(&set->bindings))
767 err = nft_delset(ctx, set);
772 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
775 err = nft_delchain(ctx);
780 err = nft_deltable(ctx);
785 static int nft_flush(struct nft_ctx *ctx, int family)
787 struct nft_af_info *afi;
788 struct nft_table *table, *nt;
789 const struct nlattr * const *nla = ctx->nla;
792 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
793 if (family != AF_UNSPEC && afi->family != family)
797 list_for_each_entry_safe(table, nt, &afi->tables, list) {
798 if (nla[NFTA_TABLE_NAME] &&
799 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
804 err = nft_flush_table(ctx);
813 static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb,
814 const struct nlmsghdr *nlh,
815 const struct nlattr * const nla[])
817 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
818 struct nft_af_info *afi;
819 struct nft_table *table;
820 struct net *net = sock_net(skb->sk);
821 int family = nfmsg->nfgen_family;
824 nft_ctx_init(&ctx, skb, nlh, NULL, NULL, NULL, nla);
825 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
826 return nft_flush(&ctx, family);
828 afi = nf_tables_afinfo_lookup(net, family, false);
832 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
834 return PTR_ERR(table);
835 if (table->flags & NFT_TABLE_INACTIVE)
841 return nft_flush_table(&ctx);
844 static void nf_tables_table_destroy(struct nft_ctx *ctx)
846 BUG_ON(ctx->table->use > 0);
849 module_put(ctx->afi->owner);
852 int nft_register_chain_type(const struct nf_chain_type *ctype)
856 nfnl_lock(NFNL_SUBSYS_NFTABLES);
857 if (chain_type[ctype->family][ctype->type] != NULL) {
861 chain_type[ctype->family][ctype->type] = ctype;
863 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
866 EXPORT_SYMBOL_GPL(nft_register_chain_type);
868 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
870 nfnl_lock(NFNL_SUBSYS_NFTABLES);
871 chain_type[ctype->family][ctype->type] = NULL;
872 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
874 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
880 static struct nft_chain *
881 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
883 struct nft_chain *chain;
885 list_for_each_entry(chain, &table->chains, list) {
886 if (chain->handle == handle)
890 return ERR_PTR(-ENOENT);
893 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
894 const struct nlattr *nla)
896 struct nft_chain *chain;
899 return ERR_PTR(-EINVAL);
901 list_for_each_entry(chain, &table->chains, list) {
902 if (!nla_strcmp(nla, chain->name))
906 return ERR_PTR(-ENOENT);
909 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
910 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
911 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
912 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
913 .len = NFT_CHAIN_MAXNAMELEN - 1 },
914 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
915 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
916 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
917 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
920 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
921 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
922 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
923 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
924 .len = IFNAMSIZ - 1 },
927 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
929 struct nft_stats *cpu_stats, total;
935 memset(&total, 0, sizeof(total));
936 for_each_possible_cpu(cpu) {
937 cpu_stats = per_cpu_ptr(stats, cpu);
939 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
940 pkts = cpu_stats->pkts;
941 bytes = cpu_stats->bytes;
942 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
944 total.bytes += bytes;
946 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
948 goto nla_put_failure;
950 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) ||
951 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes)))
952 goto nla_put_failure;
954 nla_nest_end(skb, nest);
961 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
962 u32 portid, u32 seq, int event, u32 flags,
963 int family, const struct nft_table *table,
964 const struct nft_chain *chain)
966 struct nlmsghdr *nlh;
967 struct nfgenmsg *nfmsg;
969 event |= NFNL_SUBSYS_NFTABLES << 8;
970 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
972 goto nla_put_failure;
974 nfmsg = nlmsg_data(nlh);
975 nfmsg->nfgen_family = family;
976 nfmsg->version = NFNETLINK_V0;
977 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
979 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
980 goto nla_put_failure;
981 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle)))
982 goto nla_put_failure;
983 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
984 goto nla_put_failure;
986 if (chain->flags & NFT_BASE_CHAIN) {
987 const struct nft_base_chain *basechain = nft_base_chain(chain);
988 const struct nf_hook_ops *ops = &basechain->ops[0];
991 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
993 goto nla_put_failure;
994 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
995 goto nla_put_failure;
996 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
997 goto nla_put_failure;
998 if (basechain->dev_name[0] &&
999 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1000 goto nla_put_failure;
1001 nla_nest_end(skb, nest);
1003 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1004 htonl(basechain->policy)))
1005 goto nla_put_failure;
1007 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1008 goto nla_put_failure;
1010 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
1011 goto nla_put_failure;
1014 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1015 goto nla_put_failure;
1017 nlmsg_end(skb, nlh);
1021 nlmsg_trim(skb, nlh);
1025 static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1027 struct sk_buff *skb;
1031 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1035 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1039 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1040 event, 0, ctx->afi->family, ctx->table,
1047 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1048 ctx->report, GFP_KERNEL);
1051 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1057 static int nf_tables_dump_chains(struct sk_buff *skb,
1058 struct netlink_callback *cb)
1060 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1061 const struct nft_af_info *afi;
1062 const struct nft_table *table;
1063 const struct nft_chain *chain;
1064 unsigned int idx = 0, s_idx = cb->args[0];
1065 struct net *net = sock_net(skb->sk);
1066 int family = nfmsg->nfgen_family;
1069 cb->seq = net->nft.base_seq;
1071 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1072 if (family != NFPROTO_UNSPEC && family != afi->family)
1075 list_for_each_entry_rcu(table, &afi->tables, list) {
1076 list_for_each_entry_rcu(chain, &table->chains, list) {
1080 memset(&cb->args[1], 0,
1081 sizeof(cb->args) - sizeof(cb->args[0]));
1082 if (nf_tables_fill_chain_info(skb, net,
1083 NETLINK_CB(cb->skb).portid,
1087 afi->family, table, chain) < 0)
1090 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1102 static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb,
1103 const struct nlmsghdr *nlh,
1104 const struct nlattr * const nla[])
1106 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1107 const struct nft_af_info *afi;
1108 const struct nft_table *table;
1109 const struct nft_chain *chain;
1110 struct sk_buff *skb2;
1111 struct net *net = sock_net(skb->sk);
1112 int family = nfmsg->nfgen_family;
1115 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1116 struct netlink_dump_control c = {
1117 .dump = nf_tables_dump_chains,
1119 return netlink_dump_start(nlsk, skb, nlh, &c);
1122 afi = nf_tables_afinfo_lookup(net, family, false);
1124 return PTR_ERR(afi);
1126 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1128 return PTR_ERR(table);
1129 if (table->flags & NFT_TABLE_INACTIVE)
1132 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1134 return PTR_ERR(chain);
1135 if (chain->flags & NFT_CHAIN_INACTIVE)
1138 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1142 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1143 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1144 family, table, chain);
1148 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1155 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1156 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1157 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1160 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1162 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1163 struct nft_stats __percpu *newstats;
1164 struct nft_stats *stats;
1167 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1169 return ERR_PTR(err);
1171 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1172 return ERR_PTR(-EINVAL);
1174 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1175 if (newstats == NULL)
1176 return ERR_PTR(-ENOMEM);
1178 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1179 * are not exposed to userspace.
1182 stats = this_cpu_ptr(newstats);
1183 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1184 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1190 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1191 struct nft_stats __percpu *newstats)
1193 if (newstats == NULL)
1197 struct nft_stats __percpu *oldstats =
1198 nft_dereference(chain->stats);
1200 rcu_assign_pointer(chain->stats, newstats);
1202 free_percpu(oldstats);
1204 rcu_assign_pointer(chain->stats, newstats);
1207 static void nf_tables_chain_destroy(struct nft_chain *chain)
1209 BUG_ON(chain->use > 0);
1211 if (chain->flags & NFT_BASE_CHAIN) {
1212 struct nft_base_chain *basechain = nft_base_chain(chain);
1214 module_put(basechain->type->owner);
1215 free_percpu(basechain->stats);
1216 if (basechain->ops[0].dev != NULL)
1217 dev_put(basechain->ops[0].dev);
1224 static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
1225 const struct nlmsghdr *nlh,
1226 const struct nlattr * const nla[])
1228 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1229 const struct nlattr * uninitialized_var(name);
1230 struct nft_af_info *afi;
1231 struct nft_table *table;
1232 struct nft_chain *chain;
1233 struct nft_base_chain *basechain = NULL;
1234 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1235 struct net *net = sock_net(skb->sk);
1236 int family = nfmsg->nfgen_family;
1237 struct net_device *dev = NULL;
1238 u8 policy = NF_ACCEPT;
1241 struct nft_stats __percpu *stats;
1246 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1248 afi = nf_tables_afinfo_lookup(net, family, true);
1250 return PTR_ERR(afi);
1252 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1254 return PTR_ERR(table);
1257 name = nla[NFTA_CHAIN_NAME];
1259 if (nla[NFTA_CHAIN_HANDLE]) {
1260 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1261 chain = nf_tables_chain_lookup_byhandle(table, handle);
1263 return PTR_ERR(chain);
1265 chain = nf_tables_chain_lookup(table, name);
1266 if (IS_ERR(chain)) {
1267 if (PTR_ERR(chain) != -ENOENT)
1268 return PTR_ERR(chain);
1273 if (nla[NFTA_CHAIN_POLICY]) {
1274 if ((chain != NULL &&
1275 !(chain->flags & NFT_BASE_CHAIN)))
1278 if (chain == NULL &&
1279 nla[NFTA_CHAIN_HOOK] == NULL)
1282 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1292 if (chain != NULL) {
1293 struct nft_stats *stats = NULL;
1294 struct nft_trans *trans;
1296 if (chain->flags & NFT_CHAIN_INACTIVE)
1298 if (nlh->nlmsg_flags & NLM_F_EXCL)
1300 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1303 if (nla[NFTA_CHAIN_HANDLE] && name &&
1304 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
1307 if (nla[NFTA_CHAIN_COUNTERS]) {
1308 if (!(chain->flags & NFT_BASE_CHAIN))
1311 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1313 return PTR_ERR(stats);
1316 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1317 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1318 sizeof(struct nft_trans_chain));
1319 if (trans == NULL) {
1324 nft_trans_chain_stats(trans) = stats;
1325 nft_trans_chain_update(trans) = true;
1327 if (nla[NFTA_CHAIN_POLICY])
1328 nft_trans_chain_policy(trans) = policy;
1330 nft_trans_chain_policy(trans) = -1;
1332 if (nla[NFTA_CHAIN_HANDLE] && name) {
1333 nla_strlcpy(nft_trans_chain_name(trans), name,
1334 NFT_CHAIN_MAXNAMELEN);
1336 list_add_tail(&trans->list, &net->nft.commit_list);
1340 if (table->use == UINT_MAX)
1343 if (nla[NFTA_CHAIN_HOOK]) {
1344 const struct nf_chain_type *type;
1345 struct nf_hook_ops *ops;
1347 u32 hooknum, priority;
1349 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1350 if (nla[NFTA_CHAIN_TYPE]) {
1351 type = nf_tables_chain_type_lookup(afi,
1352 nla[NFTA_CHAIN_TYPE],
1355 return PTR_ERR(type);
1358 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1362 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1363 ha[NFTA_HOOK_PRIORITY] == NULL)
1366 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1367 if (hooknum >= afi->nhooks)
1369 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1371 if (!(type->hook_mask & (1 << hooknum)))
1373 if (!try_module_get(type->owner))
1375 hookfn = type->hooks[hooknum];
1377 if (afi->flags & NFT_AF_NEEDS_DEV) {
1378 char ifname[IFNAMSIZ];
1380 if (!ha[NFTA_HOOK_DEV]) {
1381 module_put(type->owner);
1385 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1386 dev = dev_get_by_name(net, ifname);
1388 module_put(type->owner);
1391 } else if (ha[NFTA_HOOK_DEV]) {
1392 module_put(type->owner);
1396 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1397 if (basechain == NULL) {
1398 module_put(type->owner);
1405 strncpy(basechain->dev_name, dev->name, IFNAMSIZ);
1407 if (nla[NFTA_CHAIN_COUNTERS]) {
1408 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1409 if (IS_ERR(stats)) {
1410 module_put(type->owner);
1414 return PTR_ERR(stats);
1416 basechain->stats = stats;
1418 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1419 if (stats == NULL) {
1420 module_put(type->owner);
1426 rcu_assign_pointer(basechain->stats, stats);
1429 write_pnet(&basechain->pnet, net);
1430 basechain->type = type;
1431 chain = &basechain->chain;
1433 for (i = 0; i < afi->nops; i++) {
1434 ops = &basechain->ops[i];
1436 ops->owner = afi->owner;
1437 ops->hooknum = hooknum;
1438 ops->priority = priority;
1440 ops->hook = afi->hooks[ops->hooknum];
1444 if (afi->hook_ops_init)
1445 afi->hook_ops_init(ops, i);
1448 chain->flags |= NFT_BASE_CHAIN;
1449 basechain->policy = policy;
1451 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1456 INIT_LIST_HEAD(&chain->rules);
1457 chain->handle = nf_tables_alloc_handle(table);
1458 chain->table = table;
1459 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1461 err = nf_tables_register_hooks(table, chain, afi->nops);
1465 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1466 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1471 list_add_tail_rcu(&chain->list, &table->chains);
1474 nf_tables_unregister_hooks(table, chain, afi->nops);
1476 nf_tables_chain_destroy(chain);
1480 static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
1481 const struct nlmsghdr *nlh,
1482 const struct nlattr * const nla[])
1484 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1485 struct nft_af_info *afi;
1486 struct nft_table *table;
1487 struct nft_chain *chain;
1488 struct net *net = sock_net(skb->sk);
1489 int family = nfmsg->nfgen_family;
1492 afi = nf_tables_afinfo_lookup(net, family, false);
1494 return PTR_ERR(afi);
1496 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1498 return PTR_ERR(table);
1499 if (table->flags & NFT_TABLE_INACTIVE)
1502 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1504 return PTR_ERR(chain);
1505 if (chain->flags & NFT_CHAIN_INACTIVE)
1510 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1512 return nft_delchain(&ctx);
1520 * nft_register_expr - register nf_tables expr type
1523 * Registers the expr type for use with nf_tables. Returns zero on
1524 * success or a negative errno code otherwise.
1526 int nft_register_expr(struct nft_expr_type *type)
1528 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1529 if (type->family == NFPROTO_UNSPEC)
1530 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1532 list_add_rcu(&type->list, &nf_tables_expressions);
1533 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1536 EXPORT_SYMBOL_GPL(nft_register_expr);
1539 * nft_unregister_expr - unregister nf_tables expr type
1542 * Unregisters the expr typefor use with nf_tables.
1544 void nft_unregister_expr(struct nft_expr_type *type)
1546 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1547 list_del_rcu(&type->list);
1548 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1550 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1552 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1555 const struct nft_expr_type *type;
1557 list_for_each_entry(type, &nf_tables_expressions, list) {
1558 if (!nla_strcmp(nla, type->name) &&
1559 (!type->family || type->family == family))
1565 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1568 const struct nft_expr_type *type;
1571 return ERR_PTR(-EINVAL);
1573 type = __nft_expr_type_get(family, nla);
1574 if (type != NULL && try_module_get(type->owner))
1577 #ifdef CONFIG_MODULES
1579 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1580 request_module("nft-expr-%u-%.*s", family,
1581 nla_len(nla), (char *)nla_data(nla));
1582 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1583 if (__nft_expr_type_get(family, nla))
1584 return ERR_PTR(-EAGAIN);
1586 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1587 request_module("nft-expr-%.*s",
1588 nla_len(nla), (char *)nla_data(nla));
1589 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1590 if (__nft_expr_type_get(family, nla))
1591 return ERR_PTR(-EAGAIN);
1594 return ERR_PTR(-ENOENT);
1597 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1598 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1599 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1602 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1603 const struct nft_expr *expr)
1605 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1606 goto nla_put_failure;
1608 if (expr->ops->dump) {
1609 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1611 goto nla_put_failure;
1612 if (expr->ops->dump(skb, expr) < 0)
1613 goto nla_put_failure;
1614 nla_nest_end(skb, data);
1623 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1624 const struct nft_expr *expr)
1626 struct nlattr *nest;
1628 nest = nla_nest_start(skb, attr);
1630 goto nla_put_failure;
1631 if (nf_tables_fill_expr_info(skb, expr) < 0)
1632 goto nla_put_failure;
1633 nla_nest_end(skb, nest);
1640 struct nft_expr_info {
1641 const struct nft_expr_ops *ops;
1642 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1645 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1646 const struct nlattr *nla,
1647 struct nft_expr_info *info)
1649 const struct nft_expr_type *type;
1650 const struct nft_expr_ops *ops;
1651 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1654 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1658 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1660 return PTR_ERR(type);
1662 if (tb[NFTA_EXPR_DATA]) {
1663 err = nla_parse_nested(info->tb, type->maxattr,
1664 tb[NFTA_EXPR_DATA], type->policy);
1668 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1670 if (type->select_ops != NULL) {
1671 ops = type->select_ops(ctx,
1672 (const struct nlattr * const *)info->tb);
1684 module_put(type->owner);
1688 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1689 const struct nft_expr_info *info,
1690 struct nft_expr *expr)
1692 const struct nft_expr_ops *ops = info->ops;
1697 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1709 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1710 struct nft_expr *expr)
1712 if (expr->ops->destroy)
1713 expr->ops->destroy(ctx, expr);
1714 module_put(expr->ops->type->owner);
1717 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1718 const struct nlattr *nla)
1720 struct nft_expr_info info;
1721 struct nft_expr *expr;
1724 err = nf_tables_expr_parse(ctx, nla, &info);
1729 expr = kzalloc(info.ops->size, GFP_KERNEL);
1733 err = nf_tables_newexpr(ctx, &info, expr);
1739 module_put(info.ops->type->owner);
1741 return ERR_PTR(err);
1744 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1746 nf_tables_expr_destroy(ctx, expr);
1754 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1757 struct nft_rule *rule;
1759 // FIXME: this sucks
1760 list_for_each_entry(rule, &chain->rules, list) {
1761 if (handle == rule->handle)
1765 return ERR_PTR(-ENOENT);
1768 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1769 const struct nlattr *nla)
1772 return ERR_PTR(-EINVAL);
1774 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1777 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1778 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1779 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1780 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1781 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1782 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1783 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1784 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1785 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1786 .len = NFT_USERDATA_MAXLEN },
1789 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1790 u32 portid, u32 seq, int event,
1791 u32 flags, int family,
1792 const struct nft_table *table,
1793 const struct nft_chain *chain,
1794 const struct nft_rule *rule)
1796 struct nlmsghdr *nlh;
1797 struct nfgenmsg *nfmsg;
1798 const struct nft_expr *expr, *next;
1799 struct nlattr *list;
1800 const struct nft_rule *prule;
1801 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1803 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1806 goto nla_put_failure;
1808 nfmsg = nlmsg_data(nlh);
1809 nfmsg->nfgen_family = family;
1810 nfmsg->version = NFNETLINK_V0;
1811 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1813 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1814 goto nla_put_failure;
1815 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1816 goto nla_put_failure;
1817 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle)))
1818 goto nla_put_failure;
1820 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1821 prule = list_entry(rule->list.prev, struct nft_rule, list);
1822 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1823 cpu_to_be64(prule->handle)))
1824 goto nla_put_failure;
1827 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1829 goto nla_put_failure;
1830 nft_rule_for_each_expr(expr, next, rule) {
1831 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
1832 goto nla_put_failure;
1834 nla_nest_end(skb, list);
1837 struct nft_userdata *udata = nft_userdata(rule);
1838 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1840 goto nla_put_failure;
1843 nlmsg_end(skb, nlh);
1847 nlmsg_trim(skb, nlh);
1851 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1852 const struct nft_rule *rule,
1855 struct sk_buff *skb;
1859 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1863 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1867 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1868 event, 0, ctx->afi->family, ctx->table,
1875 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1876 ctx->report, GFP_KERNEL);
1879 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1885 static int nf_tables_dump_rules(struct sk_buff *skb,
1886 struct netlink_callback *cb)
1888 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1889 const struct nft_af_info *afi;
1890 const struct nft_table *table;
1891 const struct nft_chain *chain;
1892 const struct nft_rule *rule;
1893 unsigned int idx = 0, s_idx = cb->args[0];
1894 struct net *net = sock_net(skb->sk);
1895 int family = nfmsg->nfgen_family;
1898 cb->seq = net->nft.base_seq;
1900 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1901 if (family != NFPROTO_UNSPEC && family != afi->family)
1904 list_for_each_entry_rcu(table, &afi->tables, list) {
1905 list_for_each_entry_rcu(chain, &table->chains, list) {
1906 list_for_each_entry_rcu(rule, &chain->rules, list) {
1907 if (!nft_rule_is_active(net, rule))
1912 memset(&cb->args[1], 0,
1913 sizeof(cb->args) - sizeof(cb->args[0]));
1914 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
1917 NLM_F_MULTI | NLM_F_APPEND,
1918 afi->family, table, chain, rule) < 0)
1921 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1935 static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
1936 const struct nlmsghdr *nlh,
1937 const struct nlattr * const nla[])
1939 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1940 const struct nft_af_info *afi;
1941 const struct nft_table *table;
1942 const struct nft_chain *chain;
1943 const struct nft_rule *rule;
1944 struct sk_buff *skb2;
1945 struct net *net = sock_net(skb->sk);
1946 int family = nfmsg->nfgen_family;
1949 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1950 struct netlink_dump_control c = {
1951 .dump = nf_tables_dump_rules,
1953 return netlink_dump_start(nlsk, skb, nlh, &c);
1956 afi = nf_tables_afinfo_lookup(net, family, false);
1958 return PTR_ERR(afi);
1960 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1962 return PTR_ERR(table);
1963 if (table->flags & NFT_TABLE_INACTIVE)
1966 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1968 return PTR_ERR(chain);
1969 if (chain->flags & NFT_CHAIN_INACTIVE)
1972 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1974 return PTR_ERR(rule);
1976 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1980 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
1981 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1982 family, table, chain, rule);
1986 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1993 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1994 struct nft_rule *rule)
1996 struct nft_expr *expr;
1999 * Careful: some expressions might not be initialized in case this
2000 * is called on error from nf_tables_newrule().
2002 expr = nft_expr_first(rule);
2003 while (expr->ops && expr != nft_expr_last(rule)) {
2004 nf_tables_expr_destroy(ctx, expr);
2005 expr = nft_expr_next(expr);
2010 #define NFT_RULE_MAXEXPRS 128
2012 static struct nft_expr_info *info;
2014 static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
2015 const struct nlmsghdr *nlh,
2016 const struct nlattr * const nla[])
2018 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2019 struct nft_af_info *afi;
2020 struct net *net = sock_net(skb->sk);
2021 struct nft_table *table;
2022 struct nft_chain *chain;
2023 struct nft_rule *rule, *old_rule = NULL;
2024 struct nft_userdata *udata;
2025 struct nft_trans *trans = NULL;
2026 struct nft_expr *expr;
2029 unsigned int size, i, n, ulen = 0, usize = 0;
2032 u64 handle, pos_handle;
2034 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2036 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2038 return PTR_ERR(afi);
2040 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
2042 return PTR_ERR(table);
2044 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2046 return PTR_ERR(chain);
2048 if (nla[NFTA_RULE_HANDLE]) {
2049 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2050 rule = __nf_tables_rule_lookup(chain, handle);
2052 return PTR_ERR(rule);
2054 if (nlh->nlmsg_flags & NLM_F_EXCL)
2056 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2061 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2063 handle = nf_tables_alloc_handle(table);
2065 if (chain->use == UINT_MAX)
2069 if (nla[NFTA_RULE_POSITION]) {
2070 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2073 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2074 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2075 if (IS_ERR(old_rule))
2076 return PTR_ERR(old_rule);
2079 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
2083 if (nla[NFTA_RULE_EXPRESSIONS]) {
2084 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2086 if (nla_type(tmp) != NFTA_LIST_ELEM)
2088 if (n == NFT_RULE_MAXEXPRS)
2090 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2093 size += info[n].ops->size;
2097 /* Check for overflow of dlen field */
2099 if (size >= 1 << 12)
2102 if (nla[NFTA_RULE_USERDATA]) {
2103 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2105 usize = sizeof(struct nft_userdata) + ulen;
2109 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2113 nft_rule_activate_next(net, rule);
2115 rule->handle = handle;
2117 rule->udata = ulen ? 1 : 0;
2120 udata = nft_userdata(rule);
2121 udata->len = ulen - 1;
2122 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2125 expr = nft_expr_first(rule);
2126 for (i = 0; i < n; i++) {
2127 err = nf_tables_newexpr(&ctx, &info[i], expr);
2131 expr = nft_expr_next(expr);
2134 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2135 if (nft_rule_is_active_next(net, old_rule)) {
2136 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2138 if (trans == NULL) {
2142 nft_rule_deactivate_next(net, old_rule);
2144 list_add_tail_rcu(&rule->list, &old_rule->list);
2149 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2151 list_add_rcu(&rule->list, &old_rule->list);
2153 list_add_tail_rcu(&rule->list, &chain->rules);
2156 list_add_tail_rcu(&rule->list, &old_rule->list);
2158 list_add_rcu(&rule->list, &chain->rules);
2161 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2169 list_del_rcu(&rule->list);
2171 nf_tables_rule_destroy(&ctx, rule);
2173 for (i = 0; i < n; i++) {
2174 if (info[i].ops != NULL)
2175 module_put(info[i].ops->type->owner);
2180 static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
2181 const struct nlmsghdr *nlh,
2182 const struct nlattr * const nla[])
2184 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2185 struct nft_af_info *afi;
2186 struct net *net = sock_net(skb->sk);
2187 struct nft_table *table;
2188 struct nft_chain *chain = NULL;
2189 struct nft_rule *rule;
2190 int family = nfmsg->nfgen_family, err = 0;
2193 afi = nf_tables_afinfo_lookup(net, family, false);
2195 return PTR_ERR(afi);
2197 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
2199 return PTR_ERR(table);
2200 if (table->flags & NFT_TABLE_INACTIVE)
2203 if (nla[NFTA_RULE_CHAIN]) {
2204 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2206 return PTR_ERR(chain);
2209 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
2212 if (nla[NFTA_RULE_HANDLE]) {
2213 rule = nf_tables_rule_lookup(chain,
2214 nla[NFTA_RULE_HANDLE]);
2216 return PTR_ERR(rule);
2218 err = nft_delrule(&ctx, rule);
2220 err = nft_delrule_by_chain(&ctx);
2223 list_for_each_entry(chain, &table->chains, list) {
2225 err = nft_delrule_by_chain(&ctx);
2238 static LIST_HEAD(nf_tables_set_ops);
2240 int nft_register_set(struct nft_set_ops *ops)
2242 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2243 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2244 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2247 EXPORT_SYMBOL_GPL(nft_register_set);
2249 void nft_unregister_set(struct nft_set_ops *ops)
2251 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2252 list_del_rcu(&ops->list);
2253 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2255 EXPORT_SYMBOL_GPL(nft_unregister_set);
2258 * Select a set implementation based on the data characteristics and the
2259 * given policy. The total memory use might not be known if no size is
2260 * given, in that case the amount of memory per element is used.
2262 static const struct nft_set_ops *
2263 nft_select_set_ops(const struct nlattr * const nla[],
2264 const struct nft_set_desc *desc,
2265 enum nft_set_policies policy)
2267 const struct nft_set_ops *ops, *bops;
2268 struct nft_set_estimate est, best;
2271 #ifdef CONFIG_MODULES
2272 if (list_empty(&nf_tables_set_ops)) {
2273 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2274 request_module("nft-set");
2275 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2276 if (!list_empty(&nf_tables_set_ops))
2277 return ERR_PTR(-EAGAIN);
2281 if (nla[NFTA_SET_FLAGS] != NULL) {
2282 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2283 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT;
2290 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2291 if ((ops->features & features) != features)
2293 if (!ops->estimate(desc, features, &est))
2297 case NFT_SET_POL_PERFORMANCE:
2298 if (est.class < best.class)
2300 if (est.class == best.class && est.size < best.size)
2303 case NFT_SET_POL_MEMORY:
2304 if (est.size < best.size)
2306 if (est.size == best.size && est.class < best.class)
2313 if (!try_module_get(ops->owner))
2316 module_put(bops->owner);
2325 return ERR_PTR(-EOPNOTSUPP);
2328 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2329 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2330 [NFTA_SET_NAME] = { .type = NLA_STRING,
2331 .len = IFNAMSIZ - 1 },
2332 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2333 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2334 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2335 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2336 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2337 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2338 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2339 [NFTA_SET_ID] = { .type = NLA_U32 },
2340 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2341 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2344 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2345 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2348 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx,
2349 const struct sk_buff *skb,
2350 const struct nlmsghdr *nlh,
2351 const struct nlattr * const nla[])
2353 struct net *net = sock_net(skb->sk);
2354 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2355 struct nft_af_info *afi = NULL;
2356 struct nft_table *table = NULL;
2358 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2359 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2361 return PTR_ERR(afi);
2364 if (nla[NFTA_SET_TABLE] != NULL) {
2366 return -EAFNOSUPPORT;
2368 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2370 return PTR_ERR(table);
2371 if (table->flags & NFT_TABLE_INACTIVE)
2375 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2379 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2380 const struct nlattr *nla)
2382 struct nft_set *set;
2385 return ERR_PTR(-EINVAL);
2387 list_for_each_entry(set, &table->sets, list) {
2388 if (!nla_strcmp(nla, set->name))
2391 return ERR_PTR(-ENOENT);
2394 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2395 const struct nlattr *nla)
2397 struct nft_trans *trans;
2398 u32 id = ntohl(nla_get_be32(nla));
2400 list_for_each_entry(trans, &net->nft.commit_list, list) {
2401 if (trans->msg_type == NFT_MSG_NEWSET &&
2402 id == nft_trans_set_id(trans))
2403 return nft_trans_set(trans);
2405 return ERR_PTR(-ENOENT);
2408 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2411 const struct nft_set *i;
2413 unsigned long *inuse;
2414 unsigned int n = 0, min = 0;
2416 p = strnchr(name, IFNAMSIZ, '%');
2418 if (p[1] != 'd' || strchr(p + 2, '%'))
2421 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2425 list_for_each_entry(i, &ctx->table->sets, list) {
2428 if (!sscanf(i->name, name, &tmp))
2430 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2433 set_bit(tmp - min, inuse);
2436 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2437 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2438 min += BITS_PER_BYTE * PAGE_SIZE;
2439 memset(inuse, 0, PAGE_SIZE);
2442 free_page((unsigned long)inuse);
2445 snprintf(set->name, sizeof(set->name), name, min + n);
2446 list_for_each_entry(i, &ctx->table->sets, list) {
2447 if (!strcmp(set->name, i->name))
2453 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2454 const struct nft_set *set, u16 event, u16 flags)
2456 struct nfgenmsg *nfmsg;
2457 struct nlmsghdr *nlh;
2458 struct nlattr *desc;
2459 u32 portid = ctx->portid;
2462 event |= NFNL_SUBSYS_NFTABLES << 8;
2463 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2466 goto nla_put_failure;
2468 nfmsg = nlmsg_data(nlh);
2469 nfmsg->nfgen_family = ctx->afi->family;
2470 nfmsg->version = NFNETLINK_V0;
2471 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2473 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2474 goto nla_put_failure;
2475 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2476 goto nla_put_failure;
2477 if (set->flags != 0)
2478 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2479 goto nla_put_failure;
2481 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2482 goto nla_put_failure;
2483 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2484 goto nla_put_failure;
2485 if (set->flags & NFT_SET_MAP) {
2486 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2487 goto nla_put_failure;
2488 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2489 goto nla_put_failure;
2493 nla_put_be64(skb, NFTA_SET_TIMEOUT, cpu_to_be64(set->timeout)))
2494 goto nla_put_failure;
2496 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2497 goto nla_put_failure;
2499 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2500 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2501 goto nla_put_failure;
2504 desc = nla_nest_start(skb, NFTA_SET_DESC);
2506 goto nla_put_failure;
2508 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2509 goto nla_put_failure;
2510 nla_nest_end(skb, desc);
2512 nlmsg_end(skb, nlh);
2516 nlmsg_trim(skb, nlh);
2520 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2521 const struct nft_set *set,
2522 int event, gfp_t gfp_flags)
2524 struct sk_buff *skb;
2525 u32 portid = ctx->portid;
2529 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2533 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2537 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2543 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2544 ctx->report, gfp_flags);
2547 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2551 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2553 const struct nft_set *set;
2554 unsigned int idx, s_idx = cb->args[0];
2555 struct nft_af_info *afi;
2556 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2557 struct net *net = sock_net(skb->sk);
2558 int cur_family = cb->args[3];
2559 struct nft_ctx *ctx = cb->data, ctx_set;
2565 cb->seq = net->nft.base_seq;
2567 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2568 if (ctx->afi && ctx->afi != afi)
2572 if (afi->family != cur_family)
2577 list_for_each_entry_rcu(table, &afi->tables, list) {
2578 if (ctx->table && ctx->table != table)
2582 if (cur_table != table)
2588 list_for_each_entry_rcu(set, &table->sets, list) {
2593 ctx_set.table = table;
2595 if (nf_tables_fill_set(skb, &ctx_set, set,
2599 cb->args[2] = (unsigned long) table;
2600 cb->args[3] = afi->family;
2603 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2617 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2623 static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
2624 const struct nlmsghdr *nlh,
2625 const struct nlattr * const nla[])
2627 const struct nft_set *set;
2629 struct sk_buff *skb2;
2630 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2633 /* Verify existence before starting dump */
2634 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2638 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2639 struct netlink_dump_control c = {
2640 .dump = nf_tables_dump_sets,
2641 .done = nf_tables_dump_sets_done,
2643 struct nft_ctx *ctx_dump;
2645 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2646 if (ctx_dump == NULL)
2652 return netlink_dump_start(nlsk, skb, nlh, &c);
2655 /* Only accept unspec with dump */
2656 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2657 return -EAFNOSUPPORT;
2659 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2661 return PTR_ERR(set);
2662 if (set->flags & NFT_SET_INACTIVE)
2665 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2669 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2673 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2680 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2681 struct nft_set_desc *desc,
2682 const struct nlattr *nla)
2684 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2687 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2691 if (da[NFTA_SET_DESC_SIZE] != NULL)
2692 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2697 static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
2698 const struct nlmsghdr *nlh,
2699 const struct nlattr * const nla[])
2701 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2702 const struct nft_set_ops *ops;
2703 struct nft_af_info *afi;
2704 struct net *net = sock_net(skb->sk);
2705 struct nft_table *table;
2706 struct nft_set *set;
2708 char name[IFNAMSIZ];
2712 u32 ktype, dtype, flags, policy, gc_int;
2713 struct nft_set_desc desc;
2716 if (nla[NFTA_SET_TABLE] == NULL ||
2717 nla[NFTA_SET_NAME] == NULL ||
2718 nla[NFTA_SET_KEY_LEN] == NULL ||
2719 nla[NFTA_SET_ID] == NULL)
2722 memset(&desc, 0, sizeof(desc));
2724 ktype = NFT_DATA_VALUE;
2725 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2726 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2727 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2731 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2732 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
2736 if (nla[NFTA_SET_FLAGS] != NULL) {
2737 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2738 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2739 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2740 NFT_SET_MAP | NFT_SET_EVAL))
2742 /* Only one of both operations is supported */
2743 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL)) ==
2744 (NFT_SET_MAP | NFT_SET_EVAL))
2749 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2750 if (!(flags & NFT_SET_MAP))
2753 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2754 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2755 dtype != NFT_DATA_VERDICT)
2758 if (dtype != NFT_DATA_VERDICT) {
2759 if (nla[NFTA_SET_DATA_LEN] == NULL)
2761 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2762 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
2765 desc.dlen = sizeof(struct nft_verdict);
2766 } else if (flags & NFT_SET_MAP)
2770 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2771 if (!(flags & NFT_SET_TIMEOUT))
2773 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_TIMEOUT]));
2776 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2777 if (!(flags & NFT_SET_TIMEOUT))
2779 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2782 policy = NFT_SET_POL_PERFORMANCE;
2783 if (nla[NFTA_SET_POLICY] != NULL)
2784 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2786 if (nla[NFTA_SET_DESC] != NULL) {
2787 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2792 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2794 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2796 return PTR_ERR(afi);
2798 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2800 return PTR_ERR(table);
2802 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
2804 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2806 if (PTR_ERR(set) != -ENOENT)
2807 return PTR_ERR(set);
2812 if (nlh->nlmsg_flags & NLM_F_EXCL)
2814 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2819 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2822 ops = nft_select_set_ops(nla, &desc, policy);
2824 return PTR_ERR(ops);
2827 if (ops->privsize != NULL)
2828 size = ops->privsize(nla);
2831 set = kzalloc(sizeof(*set) + size, GFP_KERNEL);
2835 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2836 err = nf_tables_set_alloc_name(&ctx, set, name);
2840 INIT_LIST_HEAD(&set->bindings);
2841 write_pnet(&set->pnet, net);
2844 set->klen = desc.klen;
2846 set->dlen = desc.dlen;
2848 set->size = desc.size;
2849 set->policy = policy;
2850 set->timeout = timeout;
2851 set->gc_int = gc_int;
2853 err = ops->init(set, &desc, nla);
2857 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2861 list_add_tail_rcu(&set->list, &table->sets);
2868 module_put(ops->owner);
2872 static void nft_set_destroy(struct nft_set *set)
2874 set->ops->destroy(set);
2875 module_put(set->ops->owner);
2879 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2881 list_del_rcu(&set->list);
2882 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
2883 nft_set_destroy(set);
2886 static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
2887 const struct nlmsghdr *nlh,
2888 const struct nlattr * const nla[])
2890 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2891 struct nft_set *set;
2895 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2896 return -EAFNOSUPPORT;
2897 if (nla[NFTA_SET_TABLE] == NULL)
2900 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2904 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2906 return PTR_ERR(set);
2907 if (set->flags & NFT_SET_INACTIVE)
2909 if (!list_empty(&set->bindings))
2912 return nft_delset(&ctx, set);
2915 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2916 const struct nft_set *set,
2917 const struct nft_set_iter *iter,
2918 const struct nft_set_elem *elem)
2920 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
2921 enum nft_registers dreg;
2923 dreg = nft_type_to_reg(set->dtype);
2924 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
2925 set->dtype == NFT_DATA_VERDICT ?
2926 NFT_DATA_VERDICT : NFT_DATA_VALUE,
2930 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2931 struct nft_set_binding *binding)
2933 struct nft_set_binding *i;
2934 struct nft_set_iter iter;
2936 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2939 if (binding->flags & NFT_SET_MAP) {
2940 /* If the set is already bound to the same chain all
2941 * jumps are already validated for that chain.
2943 list_for_each_entry(i, &set->bindings, list) {
2944 if (binding->flags & NFT_SET_MAP &&
2945 i->chain == binding->chain)
2952 iter.fn = nf_tables_bind_check_setelem;
2954 set->ops->walk(ctx, set, &iter);
2956 /* Destroy anonymous sets if binding fails */
2957 if (set->flags & NFT_SET_ANONYMOUS)
2958 nf_tables_set_destroy(ctx, set);
2964 binding->chain = ctx->chain;
2965 list_add_tail_rcu(&binding->list, &set->bindings);
2969 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2970 struct nft_set_binding *binding)
2972 list_del_rcu(&binding->list);
2974 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2975 !(set->flags & NFT_SET_INACTIVE))
2976 nf_tables_set_destroy(ctx, set);
2979 const struct nft_set_ext_type nft_set_ext_types[] = {
2980 [NFT_SET_EXT_KEY] = {
2981 .align = __alignof__(u32),
2983 [NFT_SET_EXT_DATA] = {
2984 .align = __alignof__(u32),
2986 [NFT_SET_EXT_EXPR] = {
2987 .align = __alignof__(struct nft_expr),
2989 [NFT_SET_EXT_FLAGS] = {
2991 .align = __alignof__(u8),
2993 [NFT_SET_EXT_TIMEOUT] = {
2995 .align = __alignof__(u64),
2997 [NFT_SET_EXT_EXPIRATION] = {
2998 .len = sizeof(unsigned long),
2999 .align = __alignof__(unsigned long),
3001 [NFT_SET_EXT_USERDATA] = {
3002 .len = sizeof(struct nft_userdata),
3003 .align = __alignof__(struct nft_userdata),
3006 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3012 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3013 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3014 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3015 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3016 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3017 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3018 .len = NFT_USERDATA_MAXLEN },
3021 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3022 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
3023 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
3024 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3025 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3028 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx,
3029 const struct sk_buff *skb,
3030 const struct nlmsghdr *nlh,
3031 const struct nlattr * const nla[],
3034 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3035 struct nft_af_info *afi;
3036 struct nft_table *table;
3037 struct net *net = sock_net(skb->sk);
3039 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3041 return PTR_ERR(afi);
3043 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
3045 return PTR_ERR(table);
3046 if (!trans && (table->flags & NFT_TABLE_INACTIVE))
3049 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
3053 static int nf_tables_fill_setelem(struct sk_buff *skb,
3054 const struct nft_set *set,
3055 const struct nft_set_elem *elem)
3057 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3058 unsigned char *b = skb_tail_pointer(skb);
3059 struct nlattr *nest;
3061 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3063 goto nla_put_failure;
3065 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3066 NFT_DATA_VALUE, set->klen) < 0)
3067 goto nla_put_failure;
3069 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3070 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3071 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3073 goto nla_put_failure;
3075 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3076 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3077 goto nla_put_failure;
3079 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3080 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3081 htonl(*nft_set_ext_flags(ext))))
3082 goto nla_put_failure;
3084 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3085 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3086 cpu_to_be64(*nft_set_ext_timeout(ext))))
3087 goto nla_put_failure;
3089 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3090 unsigned long expires, now = jiffies;
3092 expires = *nft_set_ext_expiration(ext);
3093 if (time_before(now, expires))
3098 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3099 cpu_to_be64(jiffies_to_msecs(expires))))
3100 goto nla_put_failure;
3103 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3104 struct nft_userdata *udata;
3106 udata = nft_set_ext_userdata(ext);
3107 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3108 udata->len + 1, udata->data))
3109 goto nla_put_failure;
3112 nla_nest_end(skb, nest);
3120 struct nft_set_dump_args {
3121 const struct netlink_callback *cb;
3122 struct nft_set_iter iter;
3123 struct sk_buff *skb;
3126 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3127 const struct nft_set *set,
3128 const struct nft_set_iter *iter,
3129 const struct nft_set_elem *elem)
3131 struct nft_set_dump_args *args;
3133 args = container_of(iter, struct nft_set_dump_args, iter);
3134 return nf_tables_fill_setelem(args->skb, set, elem);
3137 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3139 const struct nft_set *set;
3140 struct nft_set_dump_args args;
3142 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3143 struct nfgenmsg *nfmsg;
3144 struct nlmsghdr *nlh;
3145 struct nlattr *nest;
3149 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3150 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
3154 err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla,
3159 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3161 return PTR_ERR(set);
3162 if (set->flags & NFT_SET_INACTIVE)
3165 event = NFT_MSG_NEWSETELEM;
3166 event |= NFNL_SUBSYS_NFTABLES << 8;
3167 portid = NETLINK_CB(cb->skb).portid;
3168 seq = cb->nlh->nlmsg_seq;
3170 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3173 goto nla_put_failure;
3175 nfmsg = nlmsg_data(nlh);
3176 nfmsg->nfgen_family = ctx.afi->family;
3177 nfmsg->version = NFNETLINK_V0;
3178 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
3180 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3181 goto nla_put_failure;
3182 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3183 goto nla_put_failure;
3185 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3187 goto nla_put_failure;
3191 args.iter.skip = cb->args[0];
3192 args.iter.count = 0;
3194 args.iter.fn = nf_tables_dump_setelem;
3195 set->ops->walk(&ctx, set, &args.iter);
3197 nla_nest_end(skb, nest);
3198 nlmsg_end(skb, nlh);
3200 if (args.iter.err && args.iter.err != -EMSGSIZE)
3201 return args.iter.err;
3202 if (args.iter.count == cb->args[0])
3205 cb->args[0] = args.iter.count;
3212 static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb,
3213 const struct nlmsghdr *nlh,
3214 const struct nlattr * const nla[])
3216 const struct nft_set *set;
3220 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
3224 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3226 return PTR_ERR(set);
3227 if (set->flags & NFT_SET_INACTIVE)
3230 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3231 struct netlink_dump_control c = {
3232 .dump = nf_tables_dump_set,
3234 return netlink_dump_start(nlsk, skb, nlh, &c);
3239 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3240 const struct nft_ctx *ctx, u32 seq,
3241 u32 portid, int event, u16 flags,
3242 const struct nft_set *set,
3243 const struct nft_set_elem *elem)
3245 struct nfgenmsg *nfmsg;
3246 struct nlmsghdr *nlh;
3247 struct nlattr *nest;
3250 event |= NFNL_SUBSYS_NFTABLES << 8;
3251 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3254 goto nla_put_failure;
3256 nfmsg = nlmsg_data(nlh);
3257 nfmsg->nfgen_family = ctx->afi->family;
3258 nfmsg->version = NFNETLINK_V0;
3259 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3261 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3262 goto nla_put_failure;
3263 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3264 goto nla_put_failure;
3266 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3268 goto nla_put_failure;
3270 err = nf_tables_fill_setelem(skb, set, elem);
3272 goto nla_put_failure;
3274 nla_nest_end(skb, nest);
3276 nlmsg_end(skb, nlh);
3280 nlmsg_trim(skb, nlh);
3284 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3285 const struct nft_set *set,
3286 const struct nft_set_elem *elem,
3287 int event, u16 flags)
3289 struct net *net = ctx->net;
3290 u32 portid = ctx->portid;
3291 struct sk_buff *skb;
3294 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3298 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3302 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3309 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3313 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3317 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3319 struct nft_set *set)
3321 struct nft_trans *trans;
3323 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3327 nft_trans_elem_set(trans) = set;
3331 void *nft_set_elem_init(const struct nft_set *set,
3332 const struct nft_set_ext_tmpl *tmpl,
3333 const u32 *key, const u32 *data,
3334 u64 timeout, gfp_t gfp)
3336 struct nft_set_ext *ext;
3339 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3343 ext = nft_set_elem_ext(set, elem);
3344 nft_set_ext_init(ext, tmpl);
3346 memcpy(nft_set_ext_key(ext), key, set->klen);
3347 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3348 memcpy(nft_set_ext_data(ext), data, set->dlen);
3349 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3350 *nft_set_ext_expiration(ext) =
3351 jiffies + msecs_to_jiffies(timeout);
3352 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3353 *nft_set_ext_timeout(ext) = timeout;
3358 void nft_set_elem_destroy(const struct nft_set *set, void *elem)
3360 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3362 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3363 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3364 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
3365 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3366 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3370 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3372 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3373 const struct nlattr *attr)
3375 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3376 struct nft_data_desc d1, d2;
3377 struct nft_set_ext_tmpl tmpl;
3378 struct nft_set_ext *ext;
3379 struct nft_set_elem elem;
3380 struct nft_set_binding *binding;
3381 struct nft_userdata *udata;
3382 struct nft_data data;
3383 enum nft_registers dreg;
3384 struct nft_trans *trans;
3390 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3391 nft_set_elem_policy);
3395 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3398 nft_set_ext_prepare(&tmpl);
3401 if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
3402 flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
3403 if (flags & ~NFT_SET_ELEM_INTERVAL_END)
3405 if (!(set->flags & NFT_SET_INTERVAL) &&
3406 flags & NFT_SET_ELEM_INTERVAL_END)
3409 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3412 if (set->flags & NFT_SET_MAP) {
3413 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3414 !(flags & NFT_SET_ELEM_INTERVAL_END))
3416 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3417 flags & NFT_SET_ELEM_INTERVAL_END)
3420 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3425 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3426 if (!(set->flags & NFT_SET_TIMEOUT))
3428 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_ELEM_TIMEOUT]));
3429 } else if (set->flags & NFT_SET_TIMEOUT) {
3430 timeout = set->timeout;
3433 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3434 nla[NFTA_SET_ELEM_KEY]);
3438 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3441 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3443 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3444 if (timeout != set->timeout)
3445 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3448 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3449 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3450 nla[NFTA_SET_ELEM_DATA]);
3455 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3458 dreg = nft_type_to_reg(set->dtype);
3459 list_for_each_entry(binding, &set->bindings, list) {
3460 struct nft_ctx bind_ctx = {
3462 .table = ctx->table,
3463 .chain = (struct nft_chain *)binding->chain,
3466 if (!(binding->flags & NFT_SET_MAP))
3469 err = nft_validate_register_store(&bind_ctx, dreg,
3476 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
3479 /* The full maximum length of userdata can exceed the maximum
3480 * offset value (U8_MAX) for following extensions, therefor it
3481 * must be the last extension added.
3484 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3485 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3487 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3492 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
3493 timeout, GFP_KERNEL);
3494 if (elem.priv == NULL)
3497 ext = nft_set_elem_ext(set, elem.priv);
3499 *nft_set_ext_flags(ext) = flags;
3501 udata = nft_set_ext_userdata(ext);
3502 udata->len = ulen - 1;
3503 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3506 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3510 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
3511 err = set->ops->insert(set, &elem);
3515 nft_trans_elem(trans) = elem;
3516 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3524 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3525 nft_data_uninit(&data, d2.type);
3527 nft_data_uninit(&elem.key.val, d1.type);
3532 static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb,
3533 const struct nlmsghdr *nlh,
3534 const struct nlattr * const nla[])
3536 struct net *net = sock_net(skb->sk);
3537 const struct nlattr *attr;
3538 struct nft_set *set;
3542 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3545 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, true);
3549 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3551 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3552 set = nf_tables_set_lookup_byid(net,
3553 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3556 return PTR_ERR(set);
3559 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3562 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3564 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact))
3567 err = nft_add_set_elem(&ctx, set, attr);
3569 atomic_dec(&set->nelems);
3576 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3577 const struct nlattr *attr)
3579 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3580 struct nft_data_desc desc;
3581 struct nft_set_elem elem;
3582 struct nft_trans *trans;
3585 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3586 nft_set_elem_policy);
3591 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3594 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3595 nla[NFTA_SET_ELEM_KEY]);
3600 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3603 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3604 if (trans == NULL) {
3609 elem.priv = set->ops->deactivate(set, &elem);
3610 if (elem.priv == NULL) {
3615 nft_trans_elem(trans) = elem;
3616 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3622 nft_data_uninit(&elem.key.val, desc.type);
3627 static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb,
3628 const struct nlmsghdr *nlh,
3629 const struct nlattr * const nla[])
3631 const struct nlattr *attr;
3632 struct nft_set *set;
3636 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3639 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
3643 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3645 return PTR_ERR(set);
3646 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3649 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3650 err = nft_del_setelem(&ctx, set, attr);
3659 void nft_set_gc_batch_release(struct rcu_head *rcu)
3661 struct nft_set_gc_batch *gcb;
3664 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
3665 for (i = 0; i < gcb->head.cnt; i++)
3666 nft_set_elem_destroy(gcb->head.set, gcb->elems[i]);
3669 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
3671 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
3674 struct nft_set_gc_batch *gcb;
3676 gcb = kzalloc(sizeof(*gcb), gfp);
3679 gcb->head.set = set;
3682 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
3684 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
3685 u32 portid, u32 seq)
3687 struct nlmsghdr *nlh;
3688 struct nfgenmsg *nfmsg;
3689 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
3691 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
3693 goto nla_put_failure;
3695 nfmsg = nlmsg_data(nlh);
3696 nfmsg->nfgen_family = AF_UNSPEC;
3697 nfmsg->version = NFNETLINK_V0;
3698 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3700 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
3701 goto nla_put_failure;
3703 nlmsg_end(skb, nlh);
3707 nlmsg_trim(skb, nlh);
3711 static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
3713 struct nlmsghdr *nlh = nlmsg_hdr(skb);
3714 struct sk_buff *skb2;
3717 if (nlmsg_report(nlh) &&
3718 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3722 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3726 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3733 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
3734 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
3737 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
3743 static int nf_tables_getgen(struct sock *nlsk, struct sk_buff *skb,
3744 const struct nlmsghdr *nlh,
3745 const struct nlattr * const nla[])
3747 struct net *net = sock_net(skb->sk);
3748 struct sk_buff *skb2;
3751 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3755 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3760 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3766 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3767 [NFT_MSG_NEWTABLE] = {
3768 .call_batch = nf_tables_newtable,
3769 .attr_count = NFTA_TABLE_MAX,
3770 .policy = nft_table_policy,
3772 [NFT_MSG_GETTABLE] = {
3773 .call = nf_tables_gettable,
3774 .attr_count = NFTA_TABLE_MAX,
3775 .policy = nft_table_policy,
3777 [NFT_MSG_DELTABLE] = {
3778 .call_batch = nf_tables_deltable,
3779 .attr_count = NFTA_TABLE_MAX,
3780 .policy = nft_table_policy,
3782 [NFT_MSG_NEWCHAIN] = {
3783 .call_batch = nf_tables_newchain,
3784 .attr_count = NFTA_CHAIN_MAX,
3785 .policy = nft_chain_policy,
3787 [NFT_MSG_GETCHAIN] = {
3788 .call = nf_tables_getchain,
3789 .attr_count = NFTA_CHAIN_MAX,
3790 .policy = nft_chain_policy,
3792 [NFT_MSG_DELCHAIN] = {
3793 .call_batch = nf_tables_delchain,
3794 .attr_count = NFTA_CHAIN_MAX,
3795 .policy = nft_chain_policy,
3797 [NFT_MSG_NEWRULE] = {
3798 .call_batch = nf_tables_newrule,
3799 .attr_count = NFTA_RULE_MAX,
3800 .policy = nft_rule_policy,
3802 [NFT_MSG_GETRULE] = {
3803 .call = nf_tables_getrule,
3804 .attr_count = NFTA_RULE_MAX,
3805 .policy = nft_rule_policy,
3807 [NFT_MSG_DELRULE] = {
3808 .call_batch = nf_tables_delrule,
3809 .attr_count = NFTA_RULE_MAX,
3810 .policy = nft_rule_policy,
3812 [NFT_MSG_NEWSET] = {
3813 .call_batch = nf_tables_newset,
3814 .attr_count = NFTA_SET_MAX,
3815 .policy = nft_set_policy,
3817 [NFT_MSG_GETSET] = {
3818 .call = nf_tables_getset,
3819 .attr_count = NFTA_SET_MAX,
3820 .policy = nft_set_policy,
3822 [NFT_MSG_DELSET] = {
3823 .call_batch = nf_tables_delset,
3824 .attr_count = NFTA_SET_MAX,
3825 .policy = nft_set_policy,
3827 [NFT_MSG_NEWSETELEM] = {
3828 .call_batch = nf_tables_newsetelem,
3829 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3830 .policy = nft_set_elem_list_policy,
3832 [NFT_MSG_GETSETELEM] = {
3833 .call = nf_tables_getsetelem,
3834 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3835 .policy = nft_set_elem_list_policy,
3837 [NFT_MSG_DELSETELEM] = {
3838 .call_batch = nf_tables_delsetelem,
3839 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3840 .policy = nft_set_elem_list_policy,
3842 [NFT_MSG_GETGEN] = {
3843 .call = nf_tables_getgen,
3847 static void nft_chain_commit_update(struct nft_trans *trans)
3849 struct nft_base_chain *basechain;
3851 if (nft_trans_chain_name(trans)[0])
3852 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3854 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3857 basechain = nft_base_chain(trans->ctx.chain);
3858 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3860 switch (nft_trans_chain_policy(trans)) {
3863 basechain->policy = nft_trans_chain_policy(trans);
3868 static void nf_tables_commit_release(struct nft_trans *trans)
3870 switch (trans->msg_type) {
3871 case NFT_MSG_DELTABLE:
3872 nf_tables_table_destroy(&trans->ctx);
3874 case NFT_MSG_DELCHAIN:
3875 nf_tables_chain_destroy(trans->ctx.chain);
3877 case NFT_MSG_DELRULE:
3878 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3880 case NFT_MSG_DELSET:
3881 nft_set_destroy(nft_trans_set(trans));
3883 case NFT_MSG_DELSETELEM:
3884 nft_set_elem_destroy(nft_trans_elem_set(trans),
3885 nft_trans_elem(trans).priv);
3891 static int nf_tables_commit(struct sk_buff *skb)
3893 struct net *net = sock_net(skb->sk);
3894 struct nft_trans *trans, *next;
3895 struct nft_trans_elem *te;
3897 /* Bump generation counter, invalidate any dump in progress */
3898 while (++net->nft.base_seq == 0);
3900 /* A new generation has just started */
3901 net->nft.gencursor = nft_gencursor_next(net);
3903 /* Make sure all packets have left the previous generation before
3904 * purging old rules.
3908 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3909 switch (trans->msg_type) {
3910 case NFT_MSG_NEWTABLE:
3911 if (nft_trans_table_update(trans)) {
3912 if (!nft_trans_table_enable(trans)) {
3913 nf_tables_table_disable(trans->ctx.afi,
3915 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3918 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3920 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
3921 nft_trans_destroy(trans);
3923 case NFT_MSG_DELTABLE:
3924 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
3926 case NFT_MSG_NEWCHAIN:
3927 if (nft_trans_chain_update(trans))
3928 nft_chain_commit_update(trans);
3930 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
3932 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
3933 nft_trans_destroy(trans);
3935 case NFT_MSG_DELCHAIN:
3936 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
3937 nf_tables_unregister_hooks(trans->ctx.table,
3939 trans->ctx.afi->nops);
3941 case NFT_MSG_NEWRULE:
3942 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3943 nf_tables_rule_notify(&trans->ctx,
3944 nft_trans_rule(trans),
3946 nft_trans_destroy(trans);
3948 case NFT_MSG_DELRULE:
3949 list_del_rcu(&nft_trans_rule(trans)->list);
3950 nf_tables_rule_notify(&trans->ctx,
3951 nft_trans_rule(trans),
3954 case NFT_MSG_NEWSET:
3955 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
3956 /* This avoids hitting -EBUSY when deleting the table
3957 * from the transaction.
3959 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
3960 !list_empty(&nft_trans_set(trans)->bindings))
3961 trans->ctx.table->use--;
3963 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3964 NFT_MSG_NEWSET, GFP_KERNEL);
3965 nft_trans_destroy(trans);
3967 case NFT_MSG_DELSET:
3968 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3969 NFT_MSG_DELSET, GFP_KERNEL);
3971 case NFT_MSG_NEWSETELEM:
3972 te = (struct nft_trans_elem *)trans->data;
3974 te->set->ops->activate(te->set, &te->elem);
3975 nf_tables_setelem_notify(&trans->ctx, te->set,
3977 NFT_MSG_NEWSETELEM, 0);
3978 nft_trans_destroy(trans);
3980 case NFT_MSG_DELSETELEM:
3981 te = (struct nft_trans_elem *)trans->data;
3983 nf_tables_setelem_notify(&trans->ctx, te->set,
3985 NFT_MSG_DELSETELEM, 0);
3986 te->set->ops->remove(te->set, &te->elem);
3987 atomic_dec(&te->set->nelems);
3995 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3996 list_del(&trans->list);
3997 nf_tables_commit_release(trans);
4000 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
4005 static void nf_tables_abort_release(struct nft_trans *trans)
4007 switch (trans->msg_type) {
4008 case NFT_MSG_NEWTABLE:
4009 nf_tables_table_destroy(&trans->ctx);
4011 case NFT_MSG_NEWCHAIN:
4012 nf_tables_chain_destroy(trans->ctx.chain);
4014 case NFT_MSG_NEWRULE:
4015 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4017 case NFT_MSG_NEWSET:
4018 nft_set_destroy(nft_trans_set(trans));
4020 case NFT_MSG_NEWSETELEM:
4021 nft_set_elem_destroy(nft_trans_elem_set(trans),
4022 nft_trans_elem(trans).priv);
4028 static int nf_tables_abort(struct sk_buff *skb)
4030 struct net *net = sock_net(skb->sk);
4031 struct nft_trans *trans, *next;
4032 struct nft_trans_elem *te;
4034 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4035 switch (trans->msg_type) {
4036 case NFT_MSG_NEWTABLE:
4037 if (nft_trans_table_update(trans)) {
4038 if (nft_trans_table_enable(trans)) {
4039 nf_tables_table_disable(trans->ctx.afi,
4041 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4043 nft_trans_destroy(trans);
4045 list_del_rcu(&trans->ctx.table->list);
4048 case NFT_MSG_DELTABLE:
4049 list_add_tail_rcu(&trans->ctx.table->list,
4050 &trans->ctx.afi->tables);
4051 nft_trans_destroy(trans);
4053 case NFT_MSG_NEWCHAIN:
4054 if (nft_trans_chain_update(trans)) {
4055 free_percpu(nft_trans_chain_stats(trans));
4057 nft_trans_destroy(trans);
4059 trans->ctx.table->use--;
4060 list_del_rcu(&trans->ctx.chain->list);
4061 nf_tables_unregister_hooks(trans->ctx.table,
4063 trans->ctx.afi->nops);
4066 case NFT_MSG_DELCHAIN:
4067 trans->ctx.table->use++;
4068 list_add_tail_rcu(&trans->ctx.chain->list,
4069 &trans->ctx.table->chains);
4070 nft_trans_destroy(trans);
4072 case NFT_MSG_NEWRULE:
4073 trans->ctx.chain->use--;
4074 list_del_rcu(&nft_trans_rule(trans)->list);
4076 case NFT_MSG_DELRULE:
4077 trans->ctx.chain->use++;
4078 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
4079 nft_trans_destroy(trans);
4081 case NFT_MSG_NEWSET:
4082 trans->ctx.table->use--;
4083 list_del_rcu(&nft_trans_set(trans)->list);
4085 case NFT_MSG_DELSET:
4086 trans->ctx.table->use++;
4087 list_add_tail_rcu(&nft_trans_set(trans)->list,
4088 &trans->ctx.table->sets);
4089 nft_trans_destroy(trans);
4091 case NFT_MSG_NEWSETELEM:
4092 te = (struct nft_trans_elem *)trans->data;
4094 te->set->ops->remove(te->set, &te->elem);
4095 atomic_dec(&te->set->nelems);
4097 case NFT_MSG_DELSETELEM:
4098 te = (struct nft_trans_elem *)trans->data;
4100 te->set->ops->activate(te->set, &te->elem);
4103 nft_trans_destroy(trans);
4110 list_for_each_entry_safe_reverse(trans, next,
4111 &net->nft.commit_list, list) {
4112 list_del(&trans->list);
4113 nf_tables_abort_release(trans);
4119 static const struct nfnetlink_subsystem nf_tables_subsys = {
4120 .name = "nf_tables",
4121 .subsys_id = NFNL_SUBSYS_NFTABLES,
4122 .cb_count = NFT_MSG_MAX,
4124 .commit = nf_tables_commit,
4125 .abort = nf_tables_abort,
4128 int nft_chain_validate_dependency(const struct nft_chain *chain,
4129 enum nft_chain_type type)
4131 const struct nft_base_chain *basechain;
4133 if (chain->flags & NFT_BASE_CHAIN) {
4134 basechain = nft_base_chain(chain);
4135 if (basechain->type->type != type)
4140 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
4142 int nft_chain_validate_hooks(const struct nft_chain *chain,
4143 unsigned int hook_flags)
4145 struct nft_base_chain *basechain;
4147 if (chain->flags & NFT_BASE_CHAIN) {
4148 basechain = nft_base_chain(chain);
4150 if ((1 << basechain->ops[0].hooknum) & hook_flags)
4158 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
4161 * Loop detection - walk through the ruleset beginning at the destination chain
4162 * of a new jump until either the source chain is reached (loop) or all
4163 * reachable chains have been traversed.
4165 * The loop check is performed whenever a new jump verdict is added to an
4166 * expression or verdict map or a verdict map is bound to a new chain.
4169 static int nf_tables_check_loops(const struct nft_ctx *ctx,
4170 const struct nft_chain *chain);
4172 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
4173 const struct nft_set *set,
4174 const struct nft_set_iter *iter,
4175 const struct nft_set_elem *elem)
4177 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4178 const struct nft_data *data;
4180 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4181 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
4184 data = nft_set_ext_data(ext);
4185 switch (data->verdict.code) {
4188 return nf_tables_check_loops(ctx, data->verdict.chain);
4194 static int nf_tables_check_loops(const struct nft_ctx *ctx,
4195 const struct nft_chain *chain)
4197 const struct nft_rule *rule;
4198 const struct nft_expr *expr, *last;
4199 const struct nft_set *set;
4200 struct nft_set_binding *binding;
4201 struct nft_set_iter iter;
4203 if (ctx->chain == chain)
4206 list_for_each_entry(rule, &chain->rules, list) {
4207 nft_rule_for_each_expr(expr, last, rule) {
4208 const struct nft_data *data = NULL;
4211 if (!expr->ops->validate)
4214 err = expr->ops->validate(ctx, expr, &data);
4221 switch (data->verdict.code) {
4224 err = nf_tables_check_loops(ctx,
4225 data->verdict.chain);
4234 list_for_each_entry(set, &ctx->table->sets, list) {
4235 if (!(set->flags & NFT_SET_MAP) ||
4236 set->dtype != NFT_DATA_VERDICT)
4239 list_for_each_entry(binding, &set->bindings, list) {
4240 if (!(binding->flags & NFT_SET_MAP) ||
4241 binding->chain != chain)
4247 iter.fn = nf_tables_loop_check_setelem;
4249 set->ops->walk(ctx, set, &iter);
4259 * nft_parse_register - parse a register value from a netlink attribute
4261 * @attr: netlink attribute
4263 * Parse and translate a register value from a netlink attribute.
4264 * Registers used to be 128 bit wide, these register numbers will be
4265 * mapped to the corresponding 32 bit register numbers.
4267 unsigned int nft_parse_register(const struct nlattr *attr)
4271 reg = ntohl(nla_get_be32(attr));
4273 case NFT_REG_VERDICT...NFT_REG_4:
4274 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
4276 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
4279 EXPORT_SYMBOL_GPL(nft_parse_register);
4282 * nft_dump_register - dump a register value to a netlink attribute
4284 * @skb: socket buffer
4285 * @attr: attribute number
4286 * @reg: register number
4288 * Construct a netlink attribute containing the register number. For
4289 * compatibility reasons, register numbers being a multiple of 4 are
4290 * translated to the corresponding 128 bit register numbers.
4292 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
4294 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
4295 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
4297 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
4299 return nla_put_be32(skb, attr, htonl(reg));
4301 EXPORT_SYMBOL_GPL(nft_dump_register);
4304 * nft_validate_register_load - validate a load from a register
4306 * @reg: the register number
4307 * @len: the length of the data
4309 * Validate that the input register is one of the general purpose
4310 * registers and that the length of the load is within the bounds.
4312 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
4314 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
4318 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
4323 EXPORT_SYMBOL_GPL(nft_validate_register_load);
4326 * nft_validate_register_store - validate an expressions' register store
4328 * @ctx: context of the expression performing the load
4329 * @reg: the destination register number
4330 * @data: the data to load
4331 * @type: the data type
4332 * @len: the length of the data
4334 * Validate that a data load uses the appropriate data type for
4335 * the destination register and the length is within the bounds.
4336 * A value of NULL for the data means that its runtime gathered
4339 int nft_validate_register_store(const struct nft_ctx *ctx,
4340 enum nft_registers reg,
4341 const struct nft_data *data,
4342 enum nft_data_types type, unsigned int len)
4347 case NFT_REG_VERDICT:
4348 if (type != NFT_DATA_VERDICT)
4352 (data->verdict.code == NFT_GOTO ||
4353 data->verdict.code == NFT_JUMP)) {
4354 err = nf_tables_check_loops(ctx, data->verdict.chain);
4358 if (ctx->chain->level + 1 >
4359 data->verdict.chain->level) {
4360 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
4362 data->verdict.chain->level = ctx->chain->level + 1;
4368 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
4372 if (reg * NFT_REG32_SIZE + len >
4373 FIELD_SIZEOF(struct nft_regs, data))
4376 if (data != NULL && type != NFT_DATA_VALUE)
4381 EXPORT_SYMBOL_GPL(nft_validate_register_store);
4383 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
4384 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
4385 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
4386 .len = NFT_CHAIN_MAXNAMELEN - 1 },
4389 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
4390 struct nft_data_desc *desc, const struct nlattr *nla)
4392 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
4393 struct nft_chain *chain;
4396 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
4400 if (!tb[NFTA_VERDICT_CODE])
4402 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
4404 switch (data->verdict.code) {
4406 switch (data->verdict.code & NF_VERDICT_MASK) {
4421 if (!tb[NFTA_VERDICT_CHAIN])
4423 chain = nf_tables_chain_lookup(ctx->table,
4424 tb[NFTA_VERDICT_CHAIN]);
4426 return PTR_ERR(chain);
4427 if (chain->flags & NFT_BASE_CHAIN)
4431 data->verdict.chain = chain;
4435 desc->len = sizeof(data->verdict);
4436 desc->type = NFT_DATA_VERDICT;
4440 static void nft_verdict_uninit(const struct nft_data *data)
4442 switch (data->verdict.code) {
4445 data->verdict.chain->use--;
4450 static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data)
4452 struct nlattr *nest;
4454 nest = nla_nest_start(skb, NFTA_DATA_VERDICT);
4456 goto nla_put_failure;
4458 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict.code)))
4459 goto nla_put_failure;
4461 switch (data->verdict.code) {
4464 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
4465 data->verdict.chain->name))
4466 goto nla_put_failure;
4468 nla_nest_end(skb, nest);
4475 static int nft_value_init(const struct nft_ctx *ctx,
4476 struct nft_data *data, unsigned int size,
4477 struct nft_data_desc *desc, const struct nlattr *nla)
4487 nla_memcpy(data->data, nla, len);
4488 desc->type = NFT_DATA_VALUE;
4493 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
4496 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
4499 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
4500 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
4501 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
4505 * nft_data_init - parse nf_tables data netlink attributes
4507 * @ctx: context of the expression using the data
4508 * @data: destination struct nft_data
4509 * @size: maximum data length
4510 * @desc: data description
4511 * @nla: netlink attribute containing data
4513 * Parse the netlink data attributes and initialize a struct nft_data.
4514 * The type and length of data are returned in the data description.
4516 * The caller can indicate that it only wants to accept data of type
4517 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4519 int nft_data_init(const struct nft_ctx *ctx,
4520 struct nft_data *data, unsigned int size,
4521 struct nft_data_desc *desc, const struct nlattr *nla)
4523 struct nlattr *tb[NFTA_DATA_MAX + 1];
4526 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
4530 if (tb[NFTA_DATA_VALUE])
4531 return nft_value_init(ctx, data, size, desc,
4532 tb[NFTA_DATA_VALUE]);
4533 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
4534 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
4537 EXPORT_SYMBOL_GPL(nft_data_init);
4540 * nft_data_uninit - release a nft_data item
4542 * @data: struct nft_data to release
4543 * @type: type of data
4545 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4546 * all others need to be released by calling this function.
4548 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
4550 if (type < NFT_DATA_VERDICT)
4553 case NFT_DATA_VERDICT:
4554 return nft_verdict_uninit(data);
4559 EXPORT_SYMBOL_GPL(nft_data_uninit);
4561 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4562 enum nft_data_types type, unsigned int len)
4564 struct nlattr *nest;
4567 nest = nla_nest_start(skb, attr);
4572 case NFT_DATA_VALUE:
4573 err = nft_value_dump(skb, data, len);
4575 case NFT_DATA_VERDICT:
4576 err = nft_verdict_dump(skb, data);
4583 nla_nest_end(skb, nest);
4586 EXPORT_SYMBOL_GPL(nft_data_dump);
4588 static int nf_tables_init_net(struct net *net)
4590 INIT_LIST_HEAD(&net->nft.af_info);
4591 INIT_LIST_HEAD(&net->nft.commit_list);
4592 net->nft.base_seq = 1;
4596 static struct pernet_operations nf_tables_net_ops = {
4597 .init = nf_tables_init_net,
4600 static int __init nf_tables_module_init(void)
4604 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4611 err = nf_tables_core_module_init();
4615 err = nfnetlink_subsys_register(&nf_tables_subsys);
4619 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4620 return register_pernet_subsys(&nf_tables_net_ops);
4622 nf_tables_core_module_exit();
4629 static void __exit nf_tables_module_exit(void)
4631 unregister_pernet_subsys(&nf_tables_net_ops);
4632 nfnetlink_subsys_unregister(&nf_tables_subsys);
4634 nf_tables_core_module_exit();
4638 module_init(nf_tables_module_init);
4639 module_exit(nf_tables_module_exit);
4641 MODULE_LICENSE("GPL");
4642 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4643 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);