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,
93 const struct sk_buff *skb,
94 const struct nlmsghdr *nlh,
95 struct nft_af_info *afi,
96 struct nft_table *table,
97 struct nft_chain *chain,
98 const struct nlattr * const *nla)
105 ctx->portid = NETLINK_CB(skb).portid;
106 ctx->report = nlmsg_report(nlh);
107 ctx->seq = nlh->nlmsg_seq;
110 static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type,
113 struct nft_trans *trans;
115 trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL);
119 trans->msg_type = msg_type;
125 static void nft_trans_destroy(struct nft_trans *trans)
127 list_del(&trans->list);
131 int nft_register_basechain(struct nft_base_chain *basechain,
132 unsigned int hook_nops)
134 struct net *net = read_pnet(&basechain->pnet);
136 if (basechain->flags & NFT_BASECHAIN_DISABLED)
139 return nf_register_net_hooks(net, basechain->ops, hook_nops);
141 EXPORT_SYMBOL_GPL(nft_register_basechain);
143 void nft_unregister_basechain(struct nft_base_chain *basechain,
144 unsigned int hook_nops)
146 struct net *net = read_pnet(&basechain->pnet);
148 if (basechain->flags & NFT_BASECHAIN_DISABLED)
151 nf_unregister_net_hooks(net, basechain->ops, hook_nops);
153 EXPORT_SYMBOL_GPL(nft_unregister_basechain);
155 static int nf_tables_register_hooks(const struct nft_table *table,
156 struct nft_chain *chain,
157 unsigned int hook_nops)
159 if (table->flags & NFT_TABLE_F_DORMANT ||
160 !(chain->flags & NFT_BASE_CHAIN))
163 return nft_register_basechain(nft_base_chain(chain), hook_nops);
166 static void nf_tables_unregister_hooks(const struct nft_table *table,
167 struct nft_chain *chain,
168 unsigned int hook_nops)
170 if (table->flags & NFT_TABLE_F_DORMANT ||
171 !(chain->flags & NFT_BASE_CHAIN))
174 nft_unregister_basechain(nft_base_chain(chain), hook_nops);
177 /* Internal table flags */
178 #define NFT_TABLE_INACTIVE (1 << 15)
180 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
182 struct nft_trans *trans;
184 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
188 if (msg_type == NFT_MSG_NEWTABLE)
189 ctx->table->flags |= NFT_TABLE_INACTIVE;
191 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
195 static int nft_deltable(struct nft_ctx *ctx)
199 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
203 list_del_rcu(&ctx->table->list);
207 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
209 struct nft_trans *trans;
211 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
215 if (msg_type == NFT_MSG_NEWCHAIN)
216 ctx->chain->flags |= NFT_CHAIN_INACTIVE;
218 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
222 static int nft_delchain(struct nft_ctx *ctx)
226 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
231 list_del_rcu(&ctx->chain->list);
237 nft_rule_is_active(struct net *net, const struct nft_rule *rule)
239 return (rule->genmask & nft_genmask_cur(net)) == 0;
243 nft_rule_is_active_next(struct net *net, const struct nft_rule *rule)
245 return (rule->genmask & nft_genmask_next(net)) == 0;
249 nft_rule_activate_next(struct net *net, struct nft_rule *rule)
251 /* Now inactive, will be active in the future */
252 rule->genmask = nft_genmask_cur(net);
256 nft_rule_deactivate_next(struct net *net, struct nft_rule *rule)
258 rule->genmask = nft_genmask_next(net);
261 static inline void nft_rule_clear(struct net *net, struct nft_rule *rule)
263 rule->genmask &= ~nft_genmask_next(net);
267 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
269 /* You cannot delete the same rule twice */
270 if (nft_rule_is_active_next(ctx->net, rule)) {
271 nft_rule_deactivate_next(ctx->net, rule);
278 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
279 struct nft_rule *rule)
281 struct nft_trans *trans;
283 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
287 nft_trans_rule(trans) = rule;
288 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
293 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
295 struct nft_trans *trans;
298 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
302 err = nf_tables_delrule_deactivate(ctx, rule);
304 nft_trans_destroy(trans);
311 static int nft_delrule_by_chain(struct nft_ctx *ctx)
313 struct nft_rule *rule;
316 list_for_each_entry(rule, &ctx->chain->rules, list) {
317 err = nft_delrule(ctx, rule);
324 /* Internal set flag */
325 #define NFT_SET_INACTIVE (1 << 15)
327 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
330 struct nft_trans *trans;
332 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
336 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
337 nft_trans_set_id(trans) =
338 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
339 set->flags |= NFT_SET_INACTIVE;
341 nft_trans_set(trans) = set;
342 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
347 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
351 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
355 list_del_rcu(&set->list);
365 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
366 const struct nlattr *nla)
368 struct nft_table *table;
370 list_for_each_entry(table, &afi->tables, list) {
371 if (!nla_strcmp(nla, table->name))
377 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
378 const struct nlattr *nla)
380 struct nft_table *table;
383 return ERR_PTR(-EINVAL);
385 table = nft_table_lookup(afi, nla);
389 return ERR_PTR(-ENOENT);
392 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
394 return ++table->hgenerator;
397 static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
399 static const struct nf_chain_type *
400 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
404 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
405 if (chain_type[family][i] != NULL &&
406 !nla_strcmp(nla, chain_type[family][i]->name))
407 return chain_type[family][i];
412 static const struct nf_chain_type *
413 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
414 const struct nlattr *nla,
417 const struct nf_chain_type *type;
419 type = __nf_tables_chain_type_lookup(afi->family, nla);
422 #ifdef CONFIG_MODULES
424 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
425 request_module("nft-chain-%u-%.*s", afi->family,
426 nla_len(nla), (const char *)nla_data(nla));
427 nfnl_lock(NFNL_SUBSYS_NFTABLES);
428 type = __nf_tables_chain_type_lookup(afi->family, nla);
430 return ERR_PTR(-EAGAIN);
433 return ERR_PTR(-ENOENT);
436 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
437 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
438 .len = NFT_TABLE_MAXNAMELEN - 1 },
439 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
442 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
443 u32 portid, u32 seq, int event, u32 flags,
444 int family, const struct nft_table *table)
446 struct nlmsghdr *nlh;
447 struct nfgenmsg *nfmsg;
449 event |= NFNL_SUBSYS_NFTABLES << 8;
450 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
452 goto nla_put_failure;
454 nfmsg = nlmsg_data(nlh);
455 nfmsg->nfgen_family = family;
456 nfmsg->version = NFNETLINK_V0;
457 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
459 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
460 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
461 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
462 goto nla_put_failure;
468 nlmsg_trim(skb, nlh);
472 static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
478 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
482 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
486 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
487 event, 0, ctx->afi->family, ctx->table);
493 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
494 ctx->report, GFP_KERNEL);
497 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
503 static int nf_tables_dump_tables(struct sk_buff *skb,
504 struct netlink_callback *cb)
506 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
507 const struct nft_af_info *afi;
508 const struct nft_table *table;
509 unsigned int idx = 0, s_idx = cb->args[0];
510 struct net *net = sock_net(skb->sk);
511 int family = nfmsg->nfgen_family;
514 cb->seq = net->nft.base_seq;
516 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
517 if (family != NFPROTO_UNSPEC && family != afi->family)
520 list_for_each_entry_rcu(table, &afi->tables, list) {
524 memset(&cb->args[1], 0,
525 sizeof(cb->args) - sizeof(cb->args[0]));
526 if (nf_tables_fill_table_info(skb, net,
527 NETLINK_CB(cb->skb).portid,
531 afi->family, table) < 0)
534 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
545 static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb,
546 const struct nlmsghdr *nlh,
547 const struct nlattr * const nla[])
549 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
550 const struct nft_af_info *afi;
551 const struct nft_table *table;
552 struct sk_buff *skb2;
553 struct net *net = sock_net(skb->sk);
554 int family = nfmsg->nfgen_family;
557 if (nlh->nlmsg_flags & NLM_F_DUMP) {
558 struct netlink_dump_control c = {
559 .dump = nf_tables_dump_tables,
561 return netlink_dump_start(nlsk, skb, nlh, &c);
564 afi = nf_tables_afinfo_lookup(net, family, false);
568 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
570 return PTR_ERR(table);
571 if (table->flags & NFT_TABLE_INACTIVE)
574 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
578 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
579 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
584 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
591 static int nf_tables_table_enable(const struct nft_af_info *afi,
592 struct nft_table *table)
594 struct nft_chain *chain;
597 list_for_each_entry(chain, &table->chains, list) {
598 if (!(chain->flags & NFT_BASE_CHAIN))
601 err = nft_register_basechain(nft_base_chain(chain), afi->nops);
609 list_for_each_entry(chain, &table->chains, list) {
610 if (!(chain->flags & NFT_BASE_CHAIN))
616 nft_unregister_basechain(nft_base_chain(chain), afi->nops);
621 static void nf_tables_table_disable(const struct nft_af_info *afi,
622 struct nft_table *table)
624 struct nft_chain *chain;
626 list_for_each_entry(chain, &table->chains, list) {
627 if (chain->flags & NFT_BASE_CHAIN)
628 nft_unregister_basechain(nft_base_chain(chain),
633 static int nf_tables_updtable(struct nft_ctx *ctx)
635 struct nft_trans *trans;
639 if (!ctx->nla[NFTA_TABLE_FLAGS])
642 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
643 if (flags & ~NFT_TABLE_F_DORMANT)
646 if (flags == ctx->table->flags)
649 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
650 sizeof(struct nft_trans_table));
654 if ((flags & NFT_TABLE_F_DORMANT) &&
655 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
656 nft_trans_table_enable(trans) = false;
657 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
658 ctx->table->flags & NFT_TABLE_F_DORMANT) {
659 ret = nf_tables_table_enable(ctx->afi, ctx->table);
661 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
662 nft_trans_table_enable(trans) = true;
668 nft_trans_table_update(trans) = true;
669 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
672 nft_trans_destroy(trans);
676 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
677 struct sk_buff *skb, const struct nlmsghdr *nlh,
678 const struct nlattr * const nla[])
680 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
681 const struct nlattr *name;
682 struct nft_af_info *afi;
683 struct nft_table *table;
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, net, 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, net, 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 net *net, struct sock *nlsk,
814 struct sk_buff *skb, 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 int family = nfmsg->nfgen_family;
823 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
824 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
825 return nft_flush(&ctx, family);
827 afi = nf_tables_afinfo_lookup(net, family, false);
831 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
833 return PTR_ERR(table);
834 if (table->flags & NFT_TABLE_INACTIVE)
840 return nft_flush_table(&ctx);
843 static void nf_tables_table_destroy(struct nft_ctx *ctx)
845 BUG_ON(ctx->table->use > 0);
848 module_put(ctx->afi->owner);
851 int nft_register_chain_type(const struct nf_chain_type *ctype)
855 nfnl_lock(NFNL_SUBSYS_NFTABLES);
856 if (chain_type[ctype->family][ctype->type] != NULL) {
860 chain_type[ctype->family][ctype->type] = ctype;
862 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
865 EXPORT_SYMBOL_GPL(nft_register_chain_type);
867 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
869 nfnl_lock(NFNL_SUBSYS_NFTABLES);
870 chain_type[ctype->family][ctype->type] = NULL;
871 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
873 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
879 static struct nft_chain *
880 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
882 struct nft_chain *chain;
884 list_for_each_entry(chain, &table->chains, list) {
885 if (chain->handle == handle)
889 return ERR_PTR(-ENOENT);
892 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
893 const struct nlattr *nla)
895 struct nft_chain *chain;
898 return ERR_PTR(-EINVAL);
900 list_for_each_entry(chain, &table->chains, list) {
901 if (!nla_strcmp(nla, chain->name))
905 return ERR_PTR(-ENOENT);
908 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
909 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
910 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
911 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
912 .len = NFT_CHAIN_MAXNAMELEN - 1 },
913 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
914 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
915 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
916 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
919 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
920 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
921 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
922 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
923 .len = IFNAMSIZ - 1 },
926 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
928 struct nft_stats *cpu_stats, total;
934 memset(&total, 0, sizeof(total));
935 for_each_possible_cpu(cpu) {
936 cpu_stats = per_cpu_ptr(stats, cpu);
938 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
939 pkts = cpu_stats->pkts;
940 bytes = cpu_stats->bytes;
941 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
943 total.bytes += bytes;
945 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
947 goto nla_put_failure;
949 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) ||
950 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes)))
951 goto nla_put_failure;
953 nla_nest_end(skb, nest);
960 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
961 u32 portid, u32 seq, int event, u32 flags,
962 int family, const struct nft_table *table,
963 const struct nft_chain *chain)
965 struct nlmsghdr *nlh;
966 struct nfgenmsg *nfmsg;
968 event |= NFNL_SUBSYS_NFTABLES << 8;
969 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
971 goto nla_put_failure;
973 nfmsg = nlmsg_data(nlh);
974 nfmsg->nfgen_family = family;
975 nfmsg->version = NFNETLINK_V0;
976 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
978 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
979 goto nla_put_failure;
980 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle)))
981 goto nla_put_failure;
982 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
983 goto nla_put_failure;
985 if (chain->flags & NFT_BASE_CHAIN) {
986 const struct nft_base_chain *basechain = nft_base_chain(chain);
987 const struct nf_hook_ops *ops = &basechain->ops[0];
990 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
992 goto nla_put_failure;
993 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
994 goto nla_put_failure;
995 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
996 goto nla_put_failure;
997 if (basechain->dev_name[0] &&
998 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
999 goto nla_put_failure;
1000 nla_nest_end(skb, nest);
1002 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1003 htonl(basechain->policy)))
1004 goto nla_put_failure;
1006 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1007 goto nla_put_failure;
1009 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
1010 goto nla_put_failure;
1013 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1014 goto nla_put_failure;
1016 nlmsg_end(skb, nlh);
1020 nlmsg_trim(skb, nlh);
1024 static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1026 struct sk_buff *skb;
1030 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1034 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1038 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1039 event, 0, ctx->afi->family, ctx->table,
1046 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1047 ctx->report, GFP_KERNEL);
1050 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1056 static int nf_tables_dump_chains(struct sk_buff *skb,
1057 struct netlink_callback *cb)
1059 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1060 const struct nft_af_info *afi;
1061 const struct nft_table *table;
1062 const struct nft_chain *chain;
1063 unsigned int idx = 0, s_idx = cb->args[0];
1064 struct net *net = sock_net(skb->sk);
1065 int family = nfmsg->nfgen_family;
1068 cb->seq = net->nft.base_seq;
1070 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1071 if (family != NFPROTO_UNSPEC && family != afi->family)
1074 list_for_each_entry_rcu(table, &afi->tables, list) {
1075 list_for_each_entry_rcu(chain, &table->chains, list) {
1079 memset(&cb->args[1], 0,
1080 sizeof(cb->args) - sizeof(cb->args[0]));
1081 if (nf_tables_fill_chain_info(skb, net,
1082 NETLINK_CB(cb->skb).portid,
1086 afi->family, table, chain) < 0)
1089 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1101 static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb,
1102 const struct nlmsghdr *nlh,
1103 const struct nlattr * const nla[])
1105 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1106 const struct nft_af_info *afi;
1107 const struct nft_table *table;
1108 const struct nft_chain *chain;
1109 struct sk_buff *skb2;
1110 struct net *net = sock_net(skb->sk);
1111 int family = nfmsg->nfgen_family;
1114 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1115 struct netlink_dump_control c = {
1116 .dump = nf_tables_dump_chains,
1118 return netlink_dump_start(nlsk, skb, nlh, &c);
1121 afi = nf_tables_afinfo_lookup(net, family, false);
1123 return PTR_ERR(afi);
1125 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1127 return PTR_ERR(table);
1128 if (table->flags & NFT_TABLE_INACTIVE)
1131 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1133 return PTR_ERR(chain);
1134 if (chain->flags & NFT_CHAIN_INACTIVE)
1137 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1141 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1142 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1143 family, table, chain);
1147 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1154 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1155 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1156 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1159 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1161 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1162 struct nft_stats __percpu *newstats;
1163 struct nft_stats *stats;
1166 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1168 return ERR_PTR(err);
1170 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1171 return ERR_PTR(-EINVAL);
1173 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1174 if (newstats == NULL)
1175 return ERR_PTR(-ENOMEM);
1177 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1178 * are not exposed to userspace.
1181 stats = this_cpu_ptr(newstats);
1182 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1183 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1189 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1190 struct nft_stats __percpu *newstats)
1192 if (newstats == NULL)
1196 struct nft_stats __percpu *oldstats =
1197 nft_dereference(chain->stats);
1199 rcu_assign_pointer(chain->stats, newstats);
1201 free_percpu(oldstats);
1203 rcu_assign_pointer(chain->stats, newstats);
1206 static void nf_tables_chain_destroy(struct nft_chain *chain)
1208 BUG_ON(chain->use > 0);
1210 if (chain->flags & NFT_BASE_CHAIN) {
1211 struct nft_base_chain *basechain = nft_base_chain(chain);
1213 module_put(basechain->type->owner);
1214 free_percpu(basechain->stats);
1215 if (basechain->ops[0].dev != NULL)
1216 dev_put(basechain->ops[0].dev);
1223 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1224 struct sk_buff *skb, const struct nlmsghdr *nlh,
1225 const struct nlattr * const nla[])
1227 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1228 const struct nlattr * uninitialized_var(name);
1229 struct nft_af_info *afi;
1230 struct nft_table *table;
1231 struct nft_chain *chain;
1232 struct nft_base_chain *basechain = NULL;
1233 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1234 int family = nfmsg->nfgen_family;
1235 struct net_device *dev = NULL;
1236 u8 policy = NF_ACCEPT;
1239 struct nft_stats __percpu *stats;
1244 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1246 afi = nf_tables_afinfo_lookup(net, family, true);
1248 return PTR_ERR(afi);
1250 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1252 return PTR_ERR(table);
1255 name = nla[NFTA_CHAIN_NAME];
1257 if (nla[NFTA_CHAIN_HANDLE]) {
1258 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1259 chain = nf_tables_chain_lookup_byhandle(table, handle);
1261 return PTR_ERR(chain);
1263 chain = nf_tables_chain_lookup(table, name);
1264 if (IS_ERR(chain)) {
1265 if (PTR_ERR(chain) != -ENOENT)
1266 return PTR_ERR(chain);
1271 if (nla[NFTA_CHAIN_POLICY]) {
1272 if ((chain != NULL &&
1273 !(chain->flags & NFT_BASE_CHAIN)))
1276 if (chain == NULL &&
1277 nla[NFTA_CHAIN_HOOK] == NULL)
1280 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1290 if (chain != NULL) {
1291 struct nft_stats *stats = NULL;
1292 struct nft_trans *trans;
1294 if (chain->flags & NFT_CHAIN_INACTIVE)
1296 if (nlh->nlmsg_flags & NLM_F_EXCL)
1298 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1301 if (nla[NFTA_CHAIN_HANDLE] && name &&
1302 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
1305 if (nla[NFTA_CHAIN_COUNTERS]) {
1306 if (!(chain->flags & NFT_BASE_CHAIN))
1309 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1311 return PTR_ERR(stats);
1314 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1315 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1316 sizeof(struct nft_trans_chain));
1317 if (trans == NULL) {
1322 nft_trans_chain_stats(trans) = stats;
1323 nft_trans_chain_update(trans) = true;
1325 if (nla[NFTA_CHAIN_POLICY])
1326 nft_trans_chain_policy(trans) = policy;
1328 nft_trans_chain_policy(trans) = -1;
1330 if (nla[NFTA_CHAIN_HANDLE] && name) {
1331 nla_strlcpy(nft_trans_chain_name(trans), name,
1332 NFT_CHAIN_MAXNAMELEN);
1334 list_add_tail(&trans->list, &net->nft.commit_list);
1338 if (table->use == UINT_MAX)
1341 if (nla[NFTA_CHAIN_HOOK]) {
1342 const struct nf_chain_type *type;
1343 struct nf_hook_ops *ops;
1345 u32 hooknum, priority;
1347 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1348 if (nla[NFTA_CHAIN_TYPE]) {
1349 type = nf_tables_chain_type_lookup(afi,
1350 nla[NFTA_CHAIN_TYPE],
1353 return PTR_ERR(type);
1356 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1360 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1361 ha[NFTA_HOOK_PRIORITY] == NULL)
1364 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1365 if (hooknum >= afi->nhooks)
1367 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1369 if (!(type->hook_mask & (1 << hooknum)))
1371 if (!try_module_get(type->owner))
1373 hookfn = type->hooks[hooknum];
1375 if (afi->flags & NFT_AF_NEEDS_DEV) {
1376 char ifname[IFNAMSIZ];
1378 if (!ha[NFTA_HOOK_DEV]) {
1379 module_put(type->owner);
1383 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1384 dev = dev_get_by_name(net, ifname);
1386 module_put(type->owner);
1389 } else if (ha[NFTA_HOOK_DEV]) {
1390 module_put(type->owner);
1394 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1395 if (basechain == NULL) {
1396 module_put(type->owner);
1403 strncpy(basechain->dev_name, dev->name, IFNAMSIZ);
1405 if (nla[NFTA_CHAIN_COUNTERS]) {
1406 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1407 if (IS_ERR(stats)) {
1408 module_put(type->owner);
1412 return PTR_ERR(stats);
1414 basechain->stats = stats;
1416 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1417 if (stats == NULL) {
1418 module_put(type->owner);
1424 rcu_assign_pointer(basechain->stats, stats);
1427 write_pnet(&basechain->pnet, net);
1428 basechain->type = type;
1429 chain = &basechain->chain;
1431 for (i = 0; i < afi->nops; i++) {
1432 ops = &basechain->ops[i];
1434 ops->hooknum = hooknum;
1435 ops->priority = priority;
1437 ops->hook = afi->hooks[ops->hooknum];
1441 if (afi->hook_ops_init)
1442 afi->hook_ops_init(ops, i);
1445 chain->flags |= NFT_BASE_CHAIN;
1446 basechain->policy = policy;
1448 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1453 INIT_LIST_HEAD(&chain->rules);
1454 chain->handle = nf_tables_alloc_handle(table);
1455 chain->table = table;
1456 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1458 err = nf_tables_register_hooks(table, chain, afi->nops);
1462 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1463 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1468 list_add_tail_rcu(&chain->list, &table->chains);
1471 nf_tables_unregister_hooks(table, chain, afi->nops);
1473 nf_tables_chain_destroy(chain);
1477 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1478 struct sk_buff *skb, const struct nlmsghdr *nlh,
1479 const struct nlattr * const nla[])
1481 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1482 struct nft_af_info *afi;
1483 struct nft_table *table;
1484 struct nft_chain *chain;
1485 int family = nfmsg->nfgen_family;
1488 afi = nf_tables_afinfo_lookup(net, family, false);
1490 return PTR_ERR(afi);
1492 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1494 return PTR_ERR(table);
1495 if (table->flags & NFT_TABLE_INACTIVE)
1498 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1500 return PTR_ERR(chain);
1501 if (chain->flags & NFT_CHAIN_INACTIVE)
1506 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1508 return nft_delchain(&ctx);
1516 * nft_register_expr - register nf_tables expr type
1519 * Registers the expr type for use with nf_tables. Returns zero on
1520 * success or a negative errno code otherwise.
1522 int nft_register_expr(struct nft_expr_type *type)
1524 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1525 if (type->family == NFPROTO_UNSPEC)
1526 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1528 list_add_rcu(&type->list, &nf_tables_expressions);
1529 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1532 EXPORT_SYMBOL_GPL(nft_register_expr);
1535 * nft_unregister_expr - unregister nf_tables expr type
1538 * Unregisters the expr typefor use with nf_tables.
1540 void nft_unregister_expr(struct nft_expr_type *type)
1542 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1543 list_del_rcu(&type->list);
1544 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1546 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1548 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1551 const struct nft_expr_type *type;
1553 list_for_each_entry(type, &nf_tables_expressions, list) {
1554 if (!nla_strcmp(nla, type->name) &&
1555 (!type->family || type->family == family))
1561 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1564 const struct nft_expr_type *type;
1567 return ERR_PTR(-EINVAL);
1569 type = __nft_expr_type_get(family, nla);
1570 if (type != NULL && try_module_get(type->owner))
1573 #ifdef CONFIG_MODULES
1575 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1576 request_module("nft-expr-%u-%.*s", family,
1577 nla_len(nla), (char *)nla_data(nla));
1578 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1579 if (__nft_expr_type_get(family, nla))
1580 return ERR_PTR(-EAGAIN);
1582 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1583 request_module("nft-expr-%.*s",
1584 nla_len(nla), (char *)nla_data(nla));
1585 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1586 if (__nft_expr_type_get(family, nla))
1587 return ERR_PTR(-EAGAIN);
1590 return ERR_PTR(-ENOENT);
1593 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1594 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1595 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1598 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1599 const struct nft_expr *expr)
1601 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1602 goto nla_put_failure;
1604 if (expr->ops->dump) {
1605 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1607 goto nla_put_failure;
1608 if (expr->ops->dump(skb, expr) < 0)
1609 goto nla_put_failure;
1610 nla_nest_end(skb, data);
1619 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1620 const struct nft_expr *expr)
1622 struct nlattr *nest;
1624 nest = nla_nest_start(skb, attr);
1626 goto nla_put_failure;
1627 if (nf_tables_fill_expr_info(skb, expr) < 0)
1628 goto nla_put_failure;
1629 nla_nest_end(skb, nest);
1636 struct nft_expr_info {
1637 const struct nft_expr_ops *ops;
1638 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1641 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1642 const struct nlattr *nla,
1643 struct nft_expr_info *info)
1645 const struct nft_expr_type *type;
1646 const struct nft_expr_ops *ops;
1647 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1650 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1654 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1656 return PTR_ERR(type);
1658 if (tb[NFTA_EXPR_DATA]) {
1659 err = nla_parse_nested(info->tb, type->maxattr,
1660 tb[NFTA_EXPR_DATA], type->policy);
1664 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1666 if (type->select_ops != NULL) {
1667 ops = type->select_ops(ctx,
1668 (const struct nlattr * const *)info->tb);
1680 module_put(type->owner);
1684 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1685 const struct nft_expr_info *info,
1686 struct nft_expr *expr)
1688 const struct nft_expr_ops *ops = info->ops;
1693 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1705 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1706 struct nft_expr *expr)
1708 if (expr->ops->destroy)
1709 expr->ops->destroy(ctx, expr);
1710 module_put(expr->ops->type->owner);
1713 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1714 const struct nlattr *nla)
1716 struct nft_expr_info info;
1717 struct nft_expr *expr;
1720 err = nf_tables_expr_parse(ctx, nla, &info);
1725 expr = kzalloc(info.ops->size, GFP_KERNEL);
1729 err = nf_tables_newexpr(ctx, &info, expr);
1735 module_put(info.ops->type->owner);
1737 return ERR_PTR(err);
1740 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1742 nf_tables_expr_destroy(ctx, expr);
1750 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1753 struct nft_rule *rule;
1755 // FIXME: this sucks
1756 list_for_each_entry(rule, &chain->rules, list) {
1757 if (handle == rule->handle)
1761 return ERR_PTR(-ENOENT);
1764 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1765 const struct nlattr *nla)
1768 return ERR_PTR(-EINVAL);
1770 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1773 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1774 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1775 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1776 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1777 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1778 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1779 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1780 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1781 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1782 .len = NFT_USERDATA_MAXLEN },
1785 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1786 u32 portid, u32 seq, int event,
1787 u32 flags, int family,
1788 const struct nft_table *table,
1789 const struct nft_chain *chain,
1790 const struct nft_rule *rule)
1792 struct nlmsghdr *nlh;
1793 struct nfgenmsg *nfmsg;
1794 const struct nft_expr *expr, *next;
1795 struct nlattr *list;
1796 const struct nft_rule *prule;
1797 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1799 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1802 goto nla_put_failure;
1804 nfmsg = nlmsg_data(nlh);
1805 nfmsg->nfgen_family = family;
1806 nfmsg->version = NFNETLINK_V0;
1807 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1809 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1810 goto nla_put_failure;
1811 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1812 goto nla_put_failure;
1813 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle)))
1814 goto nla_put_failure;
1816 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1817 prule = list_entry(rule->list.prev, struct nft_rule, list);
1818 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1819 cpu_to_be64(prule->handle)))
1820 goto nla_put_failure;
1823 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1825 goto nla_put_failure;
1826 nft_rule_for_each_expr(expr, next, rule) {
1827 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
1828 goto nla_put_failure;
1830 nla_nest_end(skb, list);
1833 struct nft_userdata *udata = nft_userdata(rule);
1834 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1836 goto nla_put_failure;
1839 nlmsg_end(skb, nlh);
1843 nlmsg_trim(skb, nlh);
1847 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1848 const struct nft_rule *rule,
1851 struct sk_buff *skb;
1855 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1859 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1863 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1864 event, 0, ctx->afi->family, ctx->table,
1871 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1872 ctx->report, GFP_KERNEL);
1875 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1881 static int nf_tables_dump_rules(struct sk_buff *skb,
1882 struct netlink_callback *cb)
1884 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1885 const struct nft_af_info *afi;
1886 const struct nft_table *table;
1887 const struct nft_chain *chain;
1888 const struct nft_rule *rule;
1889 unsigned int idx = 0, s_idx = cb->args[0];
1890 struct net *net = sock_net(skb->sk);
1891 int family = nfmsg->nfgen_family;
1894 cb->seq = net->nft.base_seq;
1896 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1897 if (family != NFPROTO_UNSPEC && family != afi->family)
1900 list_for_each_entry_rcu(table, &afi->tables, list) {
1901 list_for_each_entry_rcu(chain, &table->chains, list) {
1902 list_for_each_entry_rcu(rule, &chain->rules, list) {
1903 if (!nft_rule_is_active(net, rule))
1908 memset(&cb->args[1], 0,
1909 sizeof(cb->args) - sizeof(cb->args[0]));
1910 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
1913 NLM_F_MULTI | NLM_F_APPEND,
1914 afi->family, table, chain, rule) < 0)
1917 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1931 static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
1932 const struct nlmsghdr *nlh,
1933 const struct nlattr * const nla[])
1935 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1936 const struct nft_af_info *afi;
1937 const struct nft_table *table;
1938 const struct nft_chain *chain;
1939 const struct nft_rule *rule;
1940 struct sk_buff *skb2;
1941 struct net *net = sock_net(skb->sk);
1942 int family = nfmsg->nfgen_family;
1945 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1946 struct netlink_dump_control c = {
1947 .dump = nf_tables_dump_rules,
1949 return netlink_dump_start(nlsk, skb, nlh, &c);
1952 afi = nf_tables_afinfo_lookup(net, family, false);
1954 return PTR_ERR(afi);
1956 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1958 return PTR_ERR(table);
1959 if (table->flags & NFT_TABLE_INACTIVE)
1962 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1964 return PTR_ERR(chain);
1965 if (chain->flags & NFT_CHAIN_INACTIVE)
1968 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1970 return PTR_ERR(rule);
1972 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1976 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
1977 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1978 family, table, chain, rule);
1982 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1989 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1990 struct nft_rule *rule)
1992 struct nft_expr *expr;
1995 * Careful: some expressions might not be initialized in case this
1996 * is called on error from nf_tables_newrule().
1998 expr = nft_expr_first(rule);
1999 while (expr->ops && expr != nft_expr_last(rule)) {
2000 nf_tables_expr_destroy(ctx, expr);
2001 expr = nft_expr_next(expr);
2006 #define NFT_RULE_MAXEXPRS 128
2008 static struct nft_expr_info *info;
2010 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2011 struct sk_buff *skb, const struct nlmsghdr *nlh,
2012 const struct nlattr * const nla[])
2014 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2015 struct nft_af_info *afi;
2016 struct nft_table *table;
2017 struct nft_chain *chain;
2018 struct nft_rule *rule, *old_rule = NULL;
2019 struct nft_userdata *udata;
2020 struct nft_trans *trans = NULL;
2021 struct nft_expr *expr;
2024 unsigned int size, i, n, ulen = 0, usize = 0;
2027 u64 handle, pos_handle;
2029 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2031 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2033 return PTR_ERR(afi);
2035 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
2037 return PTR_ERR(table);
2039 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2041 return PTR_ERR(chain);
2043 if (nla[NFTA_RULE_HANDLE]) {
2044 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2045 rule = __nf_tables_rule_lookup(chain, handle);
2047 return PTR_ERR(rule);
2049 if (nlh->nlmsg_flags & NLM_F_EXCL)
2051 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2056 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2058 handle = nf_tables_alloc_handle(table);
2060 if (chain->use == UINT_MAX)
2064 if (nla[NFTA_RULE_POSITION]) {
2065 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2068 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2069 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2070 if (IS_ERR(old_rule))
2071 return PTR_ERR(old_rule);
2074 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2078 if (nla[NFTA_RULE_EXPRESSIONS]) {
2079 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2081 if (nla_type(tmp) != NFTA_LIST_ELEM)
2083 if (n == NFT_RULE_MAXEXPRS)
2085 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2088 size += info[n].ops->size;
2092 /* Check for overflow of dlen field */
2094 if (size >= 1 << 12)
2097 if (nla[NFTA_RULE_USERDATA]) {
2098 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2100 usize = sizeof(struct nft_userdata) + ulen;
2104 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2108 nft_rule_activate_next(net, rule);
2110 rule->handle = handle;
2112 rule->udata = ulen ? 1 : 0;
2115 udata = nft_userdata(rule);
2116 udata->len = ulen - 1;
2117 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2120 expr = nft_expr_first(rule);
2121 for (i = 0; i < n; i++) {
2122 err = nf_tables_newexpr(&ctx, &info[i], expr);
2126 expr = nft_expr_next(expr);
2129 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2130 if (nft_rule_is_active_next(net, old_rule)) {
2131 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2133 if (trans == NULL) {
2137 nft_rule_deactivate_next(net, old_rule);
2139 list_add_tail_rcu(&rule->list, &old_rule->list);
2144 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2146 list_add_rcu(&rule->list, &old_rule->list);
2148 list_add_tail_rcu(&rule->list, &chain->rules);
2151 list_add_tail_rcu(&rule->list, &old_rule->list);
2153 list_add_rcu(&rule->list, &chain->rules);
2156 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2164 list_del_rcu(&rule->list);
2166 nf_tables_rule_destroy(&ctx, rule);
2168 for (i = 0; i < n; i++) {
2169 if (info[i].ops != NULL)
2170 module_put(info[i].ops->type->owner);
2175 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2176 struct sk_buff *skb, const struct nlmsghdr *nlh,
2177 const struct nlattr * const nla[])
2179 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2180 struct nft_af_info *afi;
2181 struct nft_table *table;
2182 struct nft_chain *chain = NULL;
2183 struct nft_rule *rule;
2184 int family = nfmsg->nfgen_family, err = 0;
2187 afi = nf_tables_afinfo_lookup(net, family, false);
2189 return PTR_ERR(afi);
2191 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
2193 return PTR_ERR(table);
2194 if (table->flags & NFT_TABLE_INACTIVE)
2197 if (nla[NFTA_RULE_CHAIN]) {
2198 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2200 return PTR_ERR(chain);
2203 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2206 if (nla[NFTA_RULE_HANDLE]) {
2207 rule = nf_tables_rule_lookup(chain,
2208 nla[NFTA_RULE_HANDLE]);
2210 return PTR_ERR(rule);
2212 err = nft_delrule(&ctx, rule);
2214 err = nft_delrule_by_chain(&ctx);
2217 list_for_each_entry(chain, &table->chains, list) {
2219 err = nft_delrule_by_chain(&ctx);
2232 static LIST_HEAD(nf_tables_set_ops);
2234 int nft_register_set(struct nft_set_ops *ops)
2236 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2237 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2238 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2241 EXPORT_SYMBOL_GPL(nft_register_set);
2243 void nft_unregister_set(struct nft_set_ops *ops)
2245 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2246 list_del_rcu(&ops->list);
2247 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2249 EXPORT_SYMBOL_GPL(nft_unregister_set);
2252 * Select a set implementation based on the data characteristics and the
2253 * given policy. The total memory use might not be known if no size is
2254 * given, in that case the amount of memory per element is used.
2256 static const struct nft_set_ops *
2257 nft_select_set_ops(const struct nlattr * const nla[],
2258 const struct nft_set_desc *desc,
2259 enum nft_set_policies policy)
2261 const struct nft_set_ops *ops, *bops;
2262 struct nft_set_estimate est, best;
2265 #ifdef CONFIG_MODULES
2266 if (list_empty(&nf_tables_set_ops)) {
2267 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2268 request_module("nft-set");
2269 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2270 if (!list_empty(&nf_tables_set_ops))
2271 return ERR_PTR(-EAGAIN);
2275 if (nla[NFTA_SET_FLAGS] != NULL) {
2276 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2277 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT;
2284 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2285 if ((ops->features & features) != features)
2287 if (!ops->estimate(desc, features, &est))
2291 case NFT_SET_POL_PERFORMANCE:
2292 if (est.class < best.class)
2294 if (est.class == best.class && est.size < best.size)
2297 case NFT_SET_POL_MEMORY:
2298 if (est.size < best.size)
2300 if (est.size == best.size && est.class < best.class)
2307 if (!try_module_get(ops->owner))
2310 module_put(bops->owner);
2319 return ERR_PTR(-EOPNOTSUPP);
2322 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2323 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2324 [NFTA_SET_NAME] = { .type = NLA_STRING,
2325 .len = IFNAMSIZ - 1 },
2326 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2327 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2328 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2329 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2330 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2331 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2332 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2333 [NFTA_SET_ID] = { .type = NLA_U32 },
2334 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2335 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2338 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2339 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2342 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2343 const struct sk_buff *skb,
2344 const struct nlmsghdr *nlh,
2345 const struct nlattr * const nla[])
2347 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2348 struct nft_af_info *afi = NULL;
2349 struct nft_table *table = NULL;
2351 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2352 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2354 return PTR_ERR(afi);
2357 if (nla[NFTA_SET_TABLE] != NULL) {
2359 return -EAFNOSUPPORT;
2361 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2363 return PTR_ERR(table);
2364 if (table->flags & NFT_TABLE_INACTIVE)
2368 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
2372 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2373 const struct nlattr *nla)
2375 struct nft_set *set;
2378 return ERR_PTR(-EINVAL);
2380 list_for_each_entry(set, &table->sets, list) {
2381 if (!nla_strcmp(nla, set->name))
2384 return ERR_PTR(-ENOENT);
2387 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2388 const struct nlattr *nla)
2390 struct nft_trans *trans;
2391 u32 id = ntohl(nla_get_be32(nla));
2393 list_for_each_entry(trans, &net->nft.commit_list, list) {
2394 if (trans->msg_type == NFT_MSG_NEWSET &&
2395 id == nft_trans_set_id(trans))
2396 return nft_trans_set(trans);
2398 return ERR_PTR(-ENOENT);
2401 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2404 const struct nft_set *i;
2406 unsigned long *inuse;
2407 unsigned int n = 0, min = 0;
2409 p = strnchr(name, IFNAMSIZ, '%');
2411 if (p[1] != 'd' || strchr(p + 2, '%'))
2414 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2418 list_for_each_entry(i, &ctx->table->sets, list) {
2421 if (!sscanf(i->name, name, &tmp))
2423 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2426 set_bit(tmp - min, inuse);
2429 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2430 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2431 min += BITS_PER_BYTE * PAGE_SIZE;
2432 memset(inuse, 0, PAGE_SIZE);
2435 free_page((unsigned long)inuse);
2438 snprintf(set->name, sizeof(set->name), name, min + n);
2439 list_for_each_entry(i, &ctx->table->sets, list) {
2440 if (!strcmp(set->name, i->name))
2446 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2447 const struct nft_set *set, u16 event, u16 flags)
2449 struct nfgenmsg *nfmsg;
2450 struct nlmsghdr *nlh;
2451 struct nlattr *desc;
2452 u32 portid = ctx->portid;
2455 event |= NFNL_SUBSYS_NFTABLES << 8;
2456 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2459 goto nla_put_failure;
2461 nfmsg = nlmsg_data(nlh);
2462 nfmsg->nfgen_family = ctx->afi->family;
2463 nfmsg->version = NFNETLINK_V0;
2464 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2466 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2467 goto nla_put_failure;
2468 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2469 goto nla_put_failure;
2470 if (set->flags != 0)
2471 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2472 goto nla_put_failure;
2474 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2475 goto nla_put_failure;
2476 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2477 goto nla_put_failure;
2478 if (set->flags & NFT_SET_MAP) {
2479 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2480 goto nla_put_failure;
2481 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2482 goto nla_put_failure;
2486 nla_put_be64(skb, NFTA_SET_TIMEOUT, cpu_to_be64(set->timeout)))
2487 goto nla_put_failure;
2489 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2490 goto nla_put_failure;
2492 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2493 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2494 goto nla_put_failure;
2497 desc = nla_nest_start(skb, NFTA_SET_DESC);
2499 goto nla_put_failure;
2501 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2502 goto nla_put_failure;
2503 nla_nest_end(skb, desc);
2505 nlmsg_end(skb, nlh);
2509 nlmsg_trim(skb, nlh);
2513 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2514 const struct nft_set *set,
2515 int event, gfp_t gfp_flags)
2517 struct sk_buff *skb;
2518 u32 portid = ctx->portid;
2522 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2526 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2530 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2536 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2537 ctx->report, gfp_flags);
2540 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2544 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2546 const struct nft_set *set;
2547 unsigned int idx, s_idx = cb->args[0];
2548 struct nft_af_info *afi;
2549 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2550 struct net *net = sock_net(skb->sk);
2551 int cur_family = cb->args[3];
2552 struct nft_ctx *ctx = cb->data, ctx_set;
2558 cb->seq = net->nft.base_seq;
2560 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2561 if (ctx->afi && ctx->afi != afi)
2565 if (afi->family != cur_family)
2570 list_for_each_entry_rcu(table, &afi->tables, list) {
2571 if (ctx->table && ctx->table != table)
2575 if (cur_table != table)
2581 list_for_each_entry_rcu(set, &table->sets, list) {
2586 ctx_set.table = table;
2588 if (nf_tables_fill_set(skb, &ctx_set, set,
2592 cb->args[2] = (unsigned long) table;
2593 cb->args[3] = afi->family;
2596 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2610 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2616 static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
2617 const struct nlmsghdr *nlh,
2618 const struct nlattr * const nla[])
2620 struct net *net = sock_net(skb->sk);
2621 const struct nft_set *set;
2623 struct sk_buff *skb2;
2624 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2627 /* Verify existence before starting dump */
2628 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla);
2632 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2633 struct netlink_dump_control c = {
2634 .dump = nf_tables_dump_sets,
2635 .done = nf_tables_dump_sets_done,
2637 struct nft_ctx *ctx_dump;
2639 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2640 if (ctx_dump == NULL)
2646 return netlink_dump_start(nlsk, skb, nlh, &c);
2649 /* Only accept unspec with dump */
2650 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2651 return -EAFNOSUPPORT;
2653 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2655 return PTR_ERR(set);
2656 if (set->flags & NFT_SET_INACTIVE)
2659 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2663 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2667 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2674 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2675 struct nft_set_desc *desc,
2676 const struct nlattr *nla)
2678 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2681 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2685 if (da[NFTA_SET_DESC_SIZE] != NULL)
2686 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2691 static int nf_tables_newset(struct net *net, struct sock *nlsk,
2692 struct sk_buff *skb, const struct nlmsghdr *nlh,
2693 const struct nlattr * const nla[])
2695 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2696 const struct nft_set_ops *ops;
2697 struct nft_af_info *afi;
2698 struct nft_table *table;
2699 struct nft_set *set;
2701 char name[IFNAMSIZ];
2705 u32 ktype, dtype, flags, policy, gc_int;
2706 struct nft_set_desc desc;
2709 if (nla[NFTA_SET_TABLE] == NULL ||
2710 nla[NFTA_SET_NAME] == NULL ||
2711 nla[NFTA_SET_KEY_LEN] == NULL ||
2712 nla[NFTA_SET_ID] == NULL)
2715 memset(&desc, 0, sizeof(desc));
2717 ktype = NFT_DATA_VALUE;
2718 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2719 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2720 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2724 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2725 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
2729 if (nla[NFTA_SET_FLAGS] != NULL) {
2730 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2731 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2732 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2733 NFT_SET_MAP | NFT_SET_EVAL))
2735 /* Only one of both operations is supported */
2736 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL)) ==
2737 (NFT_SET_MAP | NFT_SET_EVAL))
2742 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2743 if (!(flags & NFT_SET_MAP))
2746 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2747 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2748 dtype != NFT_DATA_VERDICT)
2751 if (dtype != NFT_DATA_VERDICT) {
2752 if (nla[NFTA_SET_DATA_LEN] == NULL)
2754 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2755 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
2758 desc.dlen = sizeof(struct nft_verdict);
2759 } else if (flags & NFT_SET_MAP)
2763 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2764 if (!(flags & NFT_SET_TIMEOUT))
2766 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_TIMEOUT]));
2769 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2770 if (!(flags & NFT_SET_TIMEOUT))
2772 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2775 policy = NFT_SET_POL_PERFORMANCE;
2776 if (nla[NFTA_SET_POLICY] != NULL)
2777 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2779 if (nla[NFTA_SET_DESC] != NULL) {
2780 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2785 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2787 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2789 return PTR_ERR(afi);
2791 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2793 return PTR_ERR(table);
2795 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
2797 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2799 if (PTR_ERR(set) != -ENOENT)
2800 return PTR_ERR(set);
2805 if (nlh->nlmsg_flags & NLM_F_EXCL)
2807 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2812 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2815 ops = nft_select_set_ops(nla, &desc, policy);
2817 return PTR_ERR(ops);
2820 if (ops->privsize != NULL)
2821 size = ops->privsize(nla);
2824 set = kzalloc(sizeof(*set) + size, GFP_KERNEL);
2828 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2829 err = nf_tables_set_alloc_name(&ctx, set, name);
2833 INIT_LIST_HEAD(&set->bindings);
2834 write_pnet(&set->pnet, net);
2837 set->klen = desc.klen;
2839 set->dlen = desc.dlen;
2841 set->size = desc.size;
2842 set->policy = policy;
2843 set->timeout = timeout;
2844 set->gc_int = gc_int;
2846 err = ops->init(set, &desc, nla);
2850 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2854 list_add_tail_rcu(&set->list, &table->sets);
2861 module_put(ops->owner);
2865 static void nft_set_destroy(struct nft_set *set)
2867 set->ops->destroy(set);
2868 module_put(set->ops->owner);
2872 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2874 list_del_rcu(&set->list);
2875 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
2876 nft_set_destroy(set);
2879 static int nf_tables_delset(struct net *net, struct sock *nlsk,
2880 struct sk_buff *skb, const struct nlmsghdr *nlh,
2881 const struct nlattr * const nla[])
2883 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2884 struct nft_set *set;
2888 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2889 return -EAFNOSUPPORT;
2890 if (nla[NFTA_SET_TABLE] == NULL)
2893 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla);
2897 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2899 return PTR_ERR(set);
2900 if (set->flags & NFT_SET_INACTIVE)
2902 if (!list_empty(&set->bindings))
2905 return nft_delset(&ctx, set);
2908 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2909 const struct nft_set *set,
2910 const struct nft_set_iter *iter,
2911 const struct nft_set_elem *elem)
2913 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
2914 enum nft_registers dreg;
2916 dreg = nft_type_to_reg(set->dtype);
2917 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
2918 set->dtype == NFT_DATA_VERDICT ?
2919 NFT_DATA_VERDICT : NFT_DATA_VALUE,
2923 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2924 struct nft_set_binding *binding)
2926 struct nft_set_binding *i;
2927 struct nft_set_iter iter;
2929 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2932 if (binding->flags & NFT_SET_MAP) {
2933 /* If the set is already bound to the same chain all
2934 * jumps are already validated for that chain.
2936 list_for_each_entry(i, &set->bindings, list) {
2937 if (binding->flags & NFT_SET_MAP &&
2938 i->chain == binding->chain)
2945 iter.fn = nf_tables_bind_check_setelem;
2947 set->ops->walk(ctx, set, &iter);
2949 /* Destroy anonymous sets if binding fails */
2950 if (set->flags & NFT_SET_ANONYMOUS)
2951 nf_tables_set_destroy(ctx, set);
2957 binding->chain = ctx->chain;
2958 list_add_tail_rcu(&binding->list, &set->bindings);
2962 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2963 struct nft_set_binding *binding)
2965 list_del_rcu(&binding->list);
2967 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2968 !(set->flags & NFT_SET_INACTIVE))
2969 nf_tables_set_destroy(ctx, set);
2972 const struct nft_set_ext_type nft_set_ext_types[] = {
2973 [NFT_SET_EXT_KEY] = {
2974 .align = __alignof__(u32),
2976 [NFT_SET_EXT_DATA] = {
2977 .align = __alignof__(u32),
2979 [NFT_SET_EXT_EXPR] = {
2980 .align = __alignof__(struct nft_expr),
2982 [NFT_SET_EXT_FLAGS] = {
2984 .align = __alignof__(u8),
2986 [NFT_SET_EXT_TIMEOUT] = {
2988 .align = __alignof__(u64),
2990 [NFT_SET_EXT_EXPIRATION] = {
2991 .len = sizeof(unsigned long),
2992 .align = __alignof__(unsigned long),
2994 [NFT_SET_EXT_USERDATA] = {
2995 .len = sizeof(struct nft_userdata),
2996 .align = __alignof__(struct nft_userdata),
2999 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3005 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3006 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3007 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3008 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3009 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3010 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3011 .len = NFT_USERDATA_MAXLEN },
3014 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3015 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
3016 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
3017 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3018 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3021 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3022 const struct sk_buff *skb,
3023 const struct nlmsghdr *nlh,
3024 const struct nlattr * const nla[],
3027 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3028 struct nft_af_info *afi;
3029 struct nft_table *table;
3031 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3033 return PTR_ERR(afi);
3035 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
3037 return PTR_ERR(table);
3038 if (!trans && (table->flags & NFT_TABLE_INACTIVE))
3041 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
3045 static int nf_tables_fill_setelem(struct sk_buff *skb,
3046 const struct nft_set *set,
3047 const struct nft_set_elem *elem)
3049 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3050 unsigned char *b = skb_tail_pointer(skb);
3051 struct nlattr *nest;
3053 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3055 goto nla_put_failure;
3057 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3058 NFT_DATA_VALUE, set->klen) < 0)
3059 goto nla_put_failure;
3061 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3062 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3063 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3065 goto nla_put_failure;
3067 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3068 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3069 goto nla_put_failure;
3071 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3072 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3073 htonl(*nft_set_ext_flags(ext))))
3074 goto nla_put_failure;
3076 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3077 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3078 cpu_to_be64(*nft_set_ext_timeout(ext))))
3079 goto nla_put_failure;
3081 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3082 unsigned long expires, now = jiffies;
3084 expires = *nft_set_ext_expiration(ext);
3085 if (time_before(now, expires))
3090 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3091 cpu_to_be64(jiffies_to_msecs(expires))))
3092 goto nla_put_failure;
3095 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3096 struct nft_userdata *udata;
3098 udata = nft_set_ext_userdata(ext);
3099 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3100 udata->len + 1, udata->data))
3101 goto nla_put_failure;
3104 nla_nest_end(skb, nest);
3112 struct nft_set_dump_args {
3113 const struct netlink_callback *cb;
3114 struct nft_set_iter iter;
3115 struct sk_buff *skb;
3118 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3119 const struct nft_set *set,
3120 const struct nft_set_iter *iter,
3121 const struct nft_set_elem *elem)
3123 struct nft_set_dump_args *args;
3125 args = container_of(iter, struct nft_set_dump_args, iter);
3126 return nf_tables_fill_setelem(args->skb, set, elem);
3129 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3131 struct net *net = sock_net(skb->sk);
3132 const struct nft_set *set;
3133 struct nft_set_dump_args args;
3135 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3136 struct nfgenmsg *nfmsg;
3137 struct nlmsghdr *nlh;
3138 struct nlattr *nest;
3142 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3143 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
3147 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
3148 (void *)nla, false);
3152 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3154 return PTR_ERR(set);
3155 if (set->flags & NFT_SET_INACTIVE)
3158 event = NFT_MSG_NEWSETELEM;
3159 event |= NFNL_SUBSYS_NFTABLES << 8;
3160 portid = NETLINK_CB(cb->skb).portid;
3161 seq = cb->nlh->nlmsg_seq;
3163 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3166 goto nla_put_failure;
3168 nfmsg = nlmsg_data(nlh);
3169 nfmsg->nfgen_family = ctx.afi->family;
3170 nfmsg->version = NFNETLINK_V0;
3171 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
3173 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3174 goto nla_put_failure;
3175 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3176 goto nla_put_failure;
3178 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3180 goto nla_put_failure;
3184 args.iter.skip = cb->args[0];
3185 args.iter.count = 0;
3187 args.iter.fn = nf_tables_dump_setelem;
3188 set->ops->walk(&ctx, set, &args.iter);
3190 nla_nest_end(skb, nest);
3191 nlmsg_end(skb, nlh);
3193 if (args.iter.err && args.iter.err != -EMSGSIZE)
3194 return args.iter.err;
3195 if (args.iter.count == cb->args[0])
3198 cb->args[0] = args.iter.count;
3205 static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb,
3206 const struct nlmsghdr *nlh,
3207 const struct nlattr * const nla[])
3209 struct net *net = sock_net(skb->sk);
3210 const struct nft_set *set;
3214 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, false);
3218 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3220 return PTR_ERR(set);
3221 if (set->flags & NFT_SET_INACTIVE)
3224 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3225 struct netlink_dump_control c = {
3226 .dump = nf_tables_dump_set,
3228 return netlink_dump_start(nlsk, skb, nlh, &c);
3233 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3234 const struct nft_ctx *ctx, u32 seq,
3235 u32 portid, int event, u16 flags,
3236 const struct nft_set *set,
3237 const struct nft_set_elem *elem)
3239 struct nfgenmsg *nfmsg;
3240 struct nlmsghdr *nlh;
3241 struct nlattr *nest;
3244 event |= NFNL_SUBSYS_NFTABLES << 8;
3245 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3248 goto nla_put_failure;
3250 nfmsg = nlmsg_data(nlh);
3251 nfmsg->nfgen_family = ctx->afi->family;
3252 nfmsg->version = NFNETLINK_V0;
3253 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3255 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3256 goto nla_put_failure;
3257 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3258 goto nla_put_failure;
3260 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3262 goto nla_put_failure;
3264 err = nf_tables_fill_setelem(skb, set, elem);
3266 goto nla_put_failure;
3268 nla_nest_end(skb, nest);
3270 nlmsg_end(skb, nlh);
3274 nlmsg_trim(skb, nlh);
3278 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3279 const struct nft_set *set,
3280 const struct nft_set_elem *elem,
3281 int event, u16 flags)
3283 struct net *net = ctx->net;
3284 u32 portid = ctx->portid;
3285 struct sk_buff *skb;
3288 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3292 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3296 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3303 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3307 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3311 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3313 struct nft_set *set)
3315 struct nft_trans *trans;
3317 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3321 nft_trans_elem_set(trans) = set;
3325 void *nft_set_elem_init(const struct nft_set *set,
3326 const struct nft_set_ext_tmpl *tmpl,
3327 const u32 *key, const u32 *data,
3328 u64 timeout, gfp_t gfp)
3330 struct nft_set_ext *ext;
3333 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3337 ext = nft_set_elem_ext(set, elem);
3338 nft_set_ext_init(ext, tmpl);
3340 memcpy(nft_set_ext_key(ext), key, set->klen);
3341 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3342 memcpy(nft_set_ext_data(ext), data, set->dlen);
3343 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3344 *nft_set_ext_expiration(ext) =
3345 jiffies + msecs_to_jiffies(timeout);
3346 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3347 *nft_set_ext_timeout(ext) = timeout;
3352 void nft_set_elem_destroy(const struct nft_set *set, void *elem)
3354 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3356 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3357 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3358 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
3359 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3360 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3364 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3366 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3367 const struct nlattr *attr)
3369 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3370 struct nft_data_desc d1, d2;
3371 struct nft_set_ext_tmpl tmpl;
3372 struct nft_set_ext *ext;
3373 struct nft_set_elem elem;
3374 struct nft_set_binding *binding;
3375 struct nft_userdata *udata;
3376 struct nft_data data;
3377 enum nft_registers dreg;
3378 struct nft_trans *trans;
3384 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3385 nft_set_elem_policy);
3389 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3392 nft_set_ext_prepare(&tmpl);
3395 if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
3396 flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
3397 if (flags & ~NFT_SET_ELEM_INTERVAL_END)
3399 if (!(set->flags & NFT_SET_INTERVAL) &&
3400 flags & NFT_SET_ELEM_INTERVAL_END)
3403 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3406 if (set->flags & NFT_SET_MAP) {
3407 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3408 !(flags & NFT_SET_ELEM_INTERVAL_END))
3410 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3411 flags & NFT_SET_ELEM_INTERVAL_END)
3414 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3419 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3420 if (!(set->flags & NFT_SET_TIMEOUT))
3422 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_ELEM_TIMEOUT]));
3423 } else if (set->flags & NFT_SET_TIMEOUT) {
3424 timeout = set->timeout;
3427 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3428 nla[NFTA_SET_ELEM_KEY]);
3432 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3435 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3437 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3438 if (timeout != set->timeout)
3439 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3442 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3443 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3444 nla[NFTA_SET_ELEM_DATA]);
3449 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3452 dreg = nft_type_to_reg(set->dtype);
3453 list_for_each_entry(binding, &set->bindings, list) {
3454 struct nft_ctx bind_ctx = {
3456 .table = ctx->table,
3457 .chain = (struct nft_chain *)binding->chain,
3460 if (!(binding->flags & NFT_SET_MAP))
3463 err = nft_validate_register_store(&bind_ctx, dreg,
3470 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
3473 /* The full maximum length of userdata can exceed the maximum
3474 * offset value (U8_MAX) for following extensions, therefor it
3475 * must be the last extension added.
3478 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3479 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3481 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3486 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
3487 timeout, GFP_KERNEL);
3488 if (elem.priv == NULL)
3491 ext = nft_set_elem_ext(set, elem.priv);
3493 *nft_set_ext_flags(ext) = flags;
3495 udata = nft_set_ext_userdata(ext);
3496 udata->len = ulen - 1;
3497 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3500 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3504 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
3505 err = set->ops->insert(set, &elem);
3509 nft_trans_elem(trans) = elem;
3510 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3518 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3519 nft_data_uninit(&data, d2.type);
3521 nft_data_uninit(&elem.key.val, d1.type);
3526 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3527 struct sk_buff *skb, const struct nlmsghdr *nlh,
3528 const struct nlattr * const nla[])
3530 const struct nlattr *attr;
3531 struct nft_set *set;
3535 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3538 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, true);
3542 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3544 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3545 set = nf_tables_set_lookup_byid(net,
3546 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3549 return PTR_ERR(set);
3552 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3555 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3557 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact))
3560 err = nft_add_set_elem(&ctx, set, attr);
3562 atomic_dec(&set->nelems);
3569 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3570 const struct nlattr *attr)
3572 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3573 struct nft_data_desc desc;
3574 struct nft_set_elem elem;
3575 struct nft_trans *trans;
3578 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3579 nft_set_elem_policy);
3584 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3587 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3588 nla[NFTA_SET_ELEM_KEY]);
3593 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3596 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3597 if (trans == NULL) {
3602 elem.priv = set->ops->deactivate(set, &elem);
3603 if (elem.priv == NULL) {
3608 nft_trans_elem(trans) = elem;
3609 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3615 nft_data_uninit(&elem.key.val, desc.type);
3620 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3621 struct sk_buff *skb, const struct nlmsghdr *nlh,
3622 const struct nlattr * const nla[])
3624 const struct nlattr *attr;
3625 struct nft_set *set;
3629 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3632 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, false);
3636 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3638 return PTR_ERR(set);
3639 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3642 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3643 err = nft_del_setelem(&ctx, set, attr);
3652 void nft_set_gc_batch_release(struct rcu_head *rcu)
3654 struct nft_set_gc_batch *gcb;
3657 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
3658 for (i = 0; i < gcb->head.cnt; i++)
3659 nft_set_elem_destroy(gcb->head.set, gcb->elems[i]);
3662 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
3664 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
3667 struct nft_set_gc_batch *gcb;
3669 gcb = kzalloc(sizeof(*gcb), gfp);
3672 gcb->head.set = set;
3675 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
3677 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
3678 u32 portid, u32 seq)
3680 struct nlmsghdr *nlh;
3681 struct nfgenmsg *nfmsg;
3682 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
3684 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
3686 goto nla_put_failure;
3688 nfmsg = nlmsg_data(nlh);
3689 nfmsg->nfgen_family = AF_UNSPEC;
3690 nfmsg->version = NFNETLINK_V0;
3691 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3693 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
3694 goto nla_put_failure;
3696 nlmsg_end(skb, nlh);
3700 nlmsg_trim(skb, nlh);
3704 static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
3706 struct nlmsghdr *nlh = nlmsg_hdr(skb);
3707 struct sk_buff *skb2;
3710 if (nlmsg_report(nlh) &&
3711 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3715 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3719 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3726 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
3727 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
3730 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
3736 static int nf_tables_getgen(struct sock *nlsk, struct sk_buff *skb,
3737 const struct nlmsghdr *nlh,
3738 const struct nlattr * const nla[])
3740 struct net *net = sock_net(skb->sk);
3741 struct sk_buff *skb2;
3744 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3748 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3753 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3759 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3760 [NFT_MSG_NEWTABLE] = {
3761 .call_batch = nf_tables_newtable,
3762 .attr_count = NFTA_TABLE_MAX,
3763 .policy = nft_table_policy,
3765 [NFT_MSG_GETTABLE] = {
3766 .call = nf_tables_gettable,
3767 .attr_count = NFTA_TABLE_MAX,
3768 .policy = nft_table_policy,
3770 [NFT_MSG_DELTABLE] = {
3771 .call_batch = nf_tables_deltable,
3772 .attr_count = NFTA_TABLE_MAX,
3773 .policy = nft_table_policy,
3775 [NFT_MSG_NEWCHAIN] = {
3776 .call_batch = nf_tables_newchain,
3777 .attr_count = NFTA_CHAIN_MAX,
3778 .policy = nft_chain_policy,
3780 [NFT_MSG_GETCHAIN] = {
3781 .call = nf_tables_getchain,
3782 .attr_count = NFTA_CHAIN_MAX,
3783 .policy = nft_chain_policy,
3785 [NFT_MSG_DELCHAIN] = {
3786 .call_batch = nf_tables_delchain,
3787 .attr_count = NFTA_CHAIN_MAX,
3788 .policy = nft_chain_policy,
3790 [NFT_MSG_NEWRULE] = {
3791 .call_batch = nf_tables_newrule,
3792 .attr_count = NFTA_RULE_MAX,
3793 .policy = nft_rule_policy,
3795 [NFT_MSG_GETRULE] = {
3796 .call = nf_tables_getrule,
3797 .attr_count = NFTA_RULE_MAX,
3798 .policy = nft_rule_policy,
3800 [NFT_MSG_DELRULE] = {
3801 .call_batch = nf_tables_delrule,
3802 .attr_count = NFTA_RULE_MAX,
3803 .policy = nft_rule_policy,
3805 [NFT_MSG_NEWSET] = {
3806 .call_batch = nf_tables_newset,
3807 .attr_count = NFTA_SET_MAX,
3808 .policy = nft_set_policy,
3810 [NFT_MSG_GETSET] = {
3811 .call = nf_tables_getset,
3812 .attr_count = NFTA_SET_MAX,
3813 .policy = nft_set_policy,
3815 [NFT_MSG_DELSET] = {
3816 .call_batch = nf_tables_delset,
3817 .attr_count = NFTA_SET_MAX,
3818 .policy = nft_set_policy,
3820 [NFT_MSG_NEWSETELEM] = {
3821 .call_batch = nf_tables_newsetelem,
3822 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3823 .policy = nft_set_elem_list_policy,
3825 [NFT_MSG_GETSETELEM] = {
3826 .call = nf_tables_getsetelem,
3827 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3828 .policy = nft_set_elem_list_policy,
3830 [NFT_MSG_DELSETELEM] = {
3831 .call_batch = nf_tables_delsetelem,
3832 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3833 .policy = nft_set_elem_list_policy,
3835 [NFT_MSG_GETGEN] = {
3836 .call = nf_tables_getgen,
3840 static void nft_chain_commit_update(struct nft_trans *trans)
3842 struct nft_base_chain *basechain;
3844 if (nft_trans_chain_name(trans)[0])
3845 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3847 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3850 basechain = nft_base_chain(trans->ctx.chain);
3851 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3853 switch (nft_trans_chain_policy(trans)) {
3856 basechain->policy = nft_trans_chain_policy(trans);
3861 static void nf_tables_commit_release(struct nft_trans *trans)
3863 switch (trans->msg_type) {
3864 case NFT_MSG_DELTABLE:
3865 nf_tables_table_destroy(&trans->ctx);
3867 case NFT_MSG_DELCHAIN:
3868 nf_tables_chain_destroy(trans->ctx.chain);
3870 case NFT_MSG_DELRULE:
3871 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3873 case NFT_MSG_DELSET:
3874 nft_set_destroy(nft_trans_set(trans));
3876 case NFT_MSG_DELSETELEM:
3877 nft_set_elem_destroy(nft_trans_elem_set(trans),
3878 nft_trans_elem(trans).priv);
3884 static int nf_tables_commit(struct sk_buff *skb)
3886 struct net *net = sock_net(skb->sk);
3887 struct nft_trans *trans, *next;
3888 struct nft_trans_elem *te;
3890 /* Bump generation counter, invalidate any dump in progress */
3891 while (++net->nft.base_seq == 0);
3893 /* A new generation has just started */
3894 net->nft.gencursor = nft_gencursor_next(net);
3896 /* Make sure all packets have left the previous generation before
3897 * purging old rules.
3901 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3902 switch (trans->msg_type) {
3903 case NFT_MSG_NEWTABLE:
3904 if (nft_trans_table_update(trans)) {
3905 if (!nft_trans_table_enable(trans)) {
3906 nf_tables_table_disable(trans->ctx.afi,
3908 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3911 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3913 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
3914 nft_trans_destroy(trans);
3916 case NFT_MSG_DELTABLE:
3917 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
3919 case NFT_MSG_NEWCHAIN:
3920 if (nft_trans_chain_update(trans))
3921 nft_chain_commit_update(trans);
3923 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
3925 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
3926 nft_trans_destroy(trans);
3928 case NFT_MSG_DELCHAIN:
3929 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
3930 nf_tables_unregister_hooks(trans->ctx.table,
3932 trans->ctx.afi->nops);
3934 case NFT_MSG_NEWRULE:
3935 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3936 nf_tables_rule_notify(&trans->ctx,
3937 nft_trans_rule(trans),
3939 nft_trans_destroy(trans);
3941 case NFT_MSG_DELRULE:
3942 list_del_rcu(&nft_trans_rule(trans)->list);
3943 nf_tables_rule_notify(&trans->ctx,
3944 nft_trans_rule(trans),
3947 case NFT_MSG_NEWSET:
3948 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
3949 /* This avoids hitting -EBUSY when deleting the table
3950 * from the transaction.
3952 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
3953 !list_empty(&nft_trans_set(trans)->bindings))
3954 trans->ctx.table->use--;
3956 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3957 NFT_MSG_NEWSET, GFP_KERNEL);
3958 nft_trans_destroy(trans);
3960 case NFT_MSG_DELSET:
3961 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3962 NFT_MSG_DELSET, GFP_KERNEL);
3964 case NFT_MSG_NEWSETELEM:
3965 te = (struct nft_trans_elem *)trans->data;
3967 te->set->ops->activate(te->set, &te->elem);
3968 nf_tables_setelem_notify(&trans->ctx, te->set,
3970 NFT_MSG_NEWSETELEM, 0);
3971 nft_trans_destroy(trans);
3973 case NFT_MSG_DELSETELEM:
3974 te = (struct nft_trans_elem *)trans->data;
3976 nf_tables_setelem_notify(&trans->ctx, te->set,
3978 NFT_MSG_DELSETELEM, 0);
3979 te->set->ops->remove(te->set, &te->elem);
3980 atomic_dec(&te->set->nelems);
3988 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3989 list_del(&trans->list);
3990 nf_tables_commit_release(trans);
3993 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
3998 static void nf_tables_abort_release(struct nft_trans *trans)
4000 switch (trans->msg_type) {
4001 case NFT_MSG_NEWTABLE:
4002 nf_tables_table_destroy(&trans->ctx);
4004 case NFT_MSG_NEWCHAIN:
4005 nf_tables_chain_destroy(trans->ctx.chain);
4007 case NFT_MSG_NEWRULE:
4008 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4010 case NFT_MSG_NEWSET:
4011 nft_set_destroy(nft_trans_set(trans));
4013 case NFT_MSG_NEWSETELEM:
4014 nft_set_elem_destroy(nft_trans_elem_set(trans),
4015 nft_trans_elem(trans).priv);
4021 static int nf_tables_abort(struct sk_buff *skb)
4023 struct net *net = sock_net(skb->sk);
4024 struct nft_trans *trans, *next;
4025 struct nft_trans_elem *te;
4027 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4029 switch (trans->msg_type) {
4030 case NFT_MSG_NEWTABLE:
4031 if (nft_trans_table_update(trans)) {
4032 if (nft_trans_table_enable(trans)) {
4033 nf_tables_table_disable(trans->ctx.afi,
4035 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4037 nft_trans_destroy(trans);
4039 list_del_rcu(&trans->ctx.table->list);
4042 case NFT_MSG_DELTABLE:
4043 list_add_tail_rcu(&trans->ctx.table->list,
4044 &trans->ctx.afi->tables);
4045 nft_trans_destroy(trans);
4047 case NFT_MSG_NEWCHAIN:
4048 if (nft_trans_chain_update(trans)) {
4049 free_percpu(nft_trans_chain_stats(trans));
4051 nft_trans_destroy(trans);
4053 trans->ctx.table->use--;
4054 list_del_rcu(&trans->ctx.chain->list);
4055 nf_tables_unregister_hooks(trans->ctx.table,
4057 trans->ctx.afi->nops);
4060 case NFT_MSG_DELCHAIN:
4061 trans->ctx.table->use++;
4062 list_add_tail_rcu(&trans->ctx.chain->list,
4063 &trans->ctx.table->chains);
4064 nft_trans_destroy(trans);
4066 case NFT_MSG_NEWRULE:
4067 trans->ctx.chain->use--;
4068 list_del_rcu(&nft_trans_rule(trans)->list);
4070 case NFT_MSG_DELRULE:
4071 trans->ctx.chain->use++;
4072 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
4073 nft_trans_destroy(trans);
4075 case NFT_MSG_NEWSET:
4076 trans->ctx.table->use--;
4077 list_del_rcu(&nft_trans_set(trans)->list);
4079 case NFT_MSG_DELSET:
4080 trans->ctx.table->use++;
4081 list_add_tail_rcu(&nft_trans_set(trans)->list,
4082 &trans->ctx.table->sets);
4083 nft_trans_destroy(trans);
4085 case NFT_MSG_NEWSETELEM:
4086 te = (struct nft_trans_elem *)trans->data;
4088 te->set->ops->remove(te->set, &te->elem);
4089 atomic_dec(&te->set->nelems);
4091 case NFT_MSG_DELSETELEM:
4092 te = (struct nft_trans_elem *)trans->data;
4094 te->set->ops->activate(te->set, &te->elem);
4097 nft_trans_destroy(trans);
4104 list_for_each_entry_safe_reverse(trans, next,
4105 &net->nft.commit_list, list) {
4106 list_del(&trans->list);
4107 nf_tables_abort_release(trans);
4113 static const struct nfnetlink_subsystem nf_tables_subsys = {
4114 .name = "nf_tables",
4115 .subsys_id = NFNL_SUBSYS_NFTABLES,
4116 .cb_count = NFT_MSG_MAX,
4118 .commit = nf_tables_commit,
4119 .abort = nf_tables_abort,
4122 int nft_chain_validate_dependency(const struct nft_chain *chain,
4123 enum nft_chain_type type)
4125 const struct nft_base_chain *basechain;
4127 if (chain->flags & NFT_BASE_CHAIN) {
4128 basechain = nft_base_chain(chain);
4129 if (basechain->type->type != type)
4134 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
4136 int nft_chain_validate_hooks(const struct nft_chain *chain,
4137 unsigned int hook_flags)
4139 struct nft_base_chain *basechain;
4141 if (chain->flags & NFT_BASE_CHAIN) {
4142 basechain = nft_base_chain(chain);
4144 if ((1 << basechain->ops[0].hooknum) & hook_flags)
4152 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
4155 * Loop detection - walk through the ruleset beginning at the destination chain
4156 * of a new jump until either the source chain is reached (loop) or all
4157 * reachable chains have been traversed.
4159 * The loop check is performed whenever a new jump verdict is added to an
4160 * expression or verdict map or a verdict map is bound to a new chain.
4163 static int nf_tables_check_loops(const struct nft_ctx *ctx,
4164 const struct nft_chain *chain);
4166 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
4167 const struct nft_set *set,
4168 const struct nft_set_iter *iter,
4169 const struct nft_set_elem *elem)
4171 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4172 const struct nft_data *data;
4174 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4175 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
4178 data = nft_set_ext_data(ext);
4179 switch (data->verdict.code) {
4182 return nf_tables_check_loops(ctx, data->verdict.chain);
4188 static int nf_tables_check_loops(const struct nft_ctx *ctx,
4189 const struct nft_chain *chain)
4191 const struct nft_rule *rule;
4192 const struct nft_expr *expr, *last;
4193 const struct nft_set *set;
4194 struct nft_set_binding *binding;
4195 struct nft_set_iter iter;
4197 if (ctx->chain == chain)
4200 list_for_each_entry(rule, &chain->rules, list) {
4201 nft_rule_for_each_expr(expr, last, rule) {
4202 const struct nft_data *data = NULL;
4205 if (!expr->ops->validate)
4208 err = expr->ops->validate(ctx, expr, &data);
4215 switch (data->verdict.code) {
4218 err = nf_tables_check_loops(ctx,
4219 data->verdict.chain);
4228 list_for_each_entry(set, &ctx->table->sets, list) {
4229 if (!(set->flags & NFT_SET_MAP) ||
4230 set->dtype != NFT_DATA_VERDICT)
4233 list_for_each_entry(binding, &set->bindings, list) {
4234 if (!(binding->flags & NFT_SET_MAP) ||
4235 binding->chain != chain)
4241 iter.fn = nf_tables_loop_check_setelem;
4243 set->ops->walk(ctx, set, &iter);
4253 * nft_parse_register - parse a register value from a netlink attribute
4255 * @attr: netlink attribute
4257 * Parse and translate a register value from a netlink attribute.
4258 * Registers used to be 128 bit wide, these register numbers will be
4259 * mapped to the corresponding 32 bit register numbers.
4261 unsigned int nft_parse_register(const struct nlattr *attr)
4265 reg = ntohl(nla_get_be32(attr));
4267 case NFT_REG_VERDICT...NFT_REG_4:
4268 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
4270 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
4273 EXPORT_SYMBOL_GPL(nft_parse_register);
4276 * nft_dump_register - dump a register value to a netlink attribute
4278 * @skb: socket buffer
4279 * @attr: attribute number
4280 * @reg: register number
4282 * Construct a netlink attribute containing the register number. For
4283 * compatibility reasons, register numbers being a multiple of 4 are
4284 * translated to the corresponding 128 bit register numbers.
4286 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
4288 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
4289 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
4291 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
4293 return nla_put_be32(skb, attr, htonl(reg));
4295 EXPORT_SYMBOL_GPL(nft_dump_register);
4298 * nft_validate_register_load - validate a load from a register
4300 * @reg: the register number
4301 * @len: the length of the data
4303 * Validate that the input register is one of the general purpose
4304 * registers and that the length of the load is within the bounds.
4306 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
4308 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
4312 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
4317 EXPORT_SYMBOL_GPL(nft_validate_register_load);
4320 * nft_validate_register_store - validate an expressions' register store
4322 * @ctx: context of the expression performing the load
4323 * @reg: the destination register number
4324 * @data: the data to load
4325 * @type: the data type
4326 * @len: the length of the data
4328 * Validate that a data load uses the appropriate data type for
4329 * the destination register and the length is within the bounds.
4330 * A value of NULL for the data means that its runtime gathered
4333 int nft_validate_register_store(const struct nft_ctx *ctx,
4334 enum nft_registers reg,
4335 const struct nft_data *data,
4336 enum nft_data_types type, unsigned int len)
4341 case NFT_REG_VERDICT:
4342 if (type != NFT_DATA_VERDICT)
4346 (data->verdict.code == NFT_GOTO ||
4347 data->verdict.code == NFT_JUMP)) {
4348 err = nf_tables_check_loops(ctx, data->verdict.chain);
4352 if (ctx->chain->level + 1 >
4353 data->verdict.chain->level) {
4354 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
4356 data->verdict.chain->level = ctx->chain->level + 1;
4362 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
4366 if (reg * NFT_REG32_SIZE + len >
4367 FIELD_SIZEOF(struct nft_regs, data))
4370 if (data != NULL && type != NFT_DATA_VALUE)
4375 EXPORT_SYMBOL_GPL(nft_validate_register_store);
4377 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
4378 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
4379 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
4380 .len = NFT_CHAIN_MAXNAMELEN - 1 },
4383 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
4384 struct nft_data_desc *desc, const struct nlattr *nla)
4386 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
4387 struct nft_chain *chain;
4390 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
4394 if (!tb[NFTA_VERDICT_CODE])
4396 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
4398 switch (data->verdict.code) {
4400 switch (data->verdict.code & NF_VERDICT_MASK) {
4415 if (!tb[NFTA_VERDICT_CHAIN])
4417 chain = nf_tables_chain_lookup(ctx->table,
4418 tb[NFTA_VERDICT_CHAIN]);
4420 return PTR_ERR(chain);
4421 if (chain->flags & NFT_BASE_CHAIN)
4425 data->verdict.chain = chain;
4429 desc->len = sizeof(data->verdict);
4430 desc->type = NFT_DATA_VERDICT;
4434 static void nft_verdict_uninit(const struct nft_data *data)
4436 switch (data->verdict.code) {
4439 data->verdict.chain->use--;
4444 static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data)
4446 struct nlattr *nest;
4448 nest = nla_nest_start(skb, NFTA_DATA_VERDICT);
4450 goto nla_put_failure;
4452 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict.code)))
4453 goto nla_put_failure;
4455 switch (data->verdict.code) {
4458 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
4459 data->verdict.chain->name))
4460 goto nla_put_failure;
4462 nla_nest_end(skb, nest);
4469 static int nft_value_init(const struct nft_ctx *ctx,
4470 struct nft_data *data, unsigned int size,
4471 struct nft_data_desc *desc, const struct nlattr *nla)
4481 nla_memcpy(data->data, nla, len);
4482 desc->type = NFT_DATA_VALUE;
4487 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
4490 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
4493 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
4494 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
4495 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
4499 * nft_data_init - parse nf_tables data netlink attributes
4501 * @ctx: context of the expression using the data
4502 * @data: destination struct nft_data
4503 * @size: maximum data length
4504 * @desc: data description
4505 * @nla: netlink attribute containing data
4507 * Parse the netlink data attributes and initialize a struct nft_data.
4508 * The type and length of data are returned in the data description.
4510 * The caller can indicate that it only wants to accept data of type
4511 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4513 int nft_data_init(const struct nft_ctx *ctx,
4514 struct nft_data *data, unsigned int size,
4515 struct nft_data_desc *desc, const struct nlattr *nla)
4517 struct nlattr *tb[NFTA_DATA_MAX + 1];
4520 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
4524 if (tb[NFTA_DATA_VALUE])
4525 return nft_value_init(ctx, data, size, desc,
4526 tb[NFTA_DATA_VALUE]);
4527 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
4528 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
4531 EXPORT_SYMBOL_GPL(nft_data_init);
4534 * nft_data_uninit - release a nft_data item
4536 * @data: struct nft_data to release
4537 * @type: type of data
4539 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4540 * all others need to be released by calling this function.
4542 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
4544 if (type < NFT_DATA_VERDICT)
4547 case NFT_DATA_VERDICT:
4548 return nft_verdict_uninit(data);
4553 EXPORT_SYMBOL_GPL(nft_data_uninit);
4555 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4556 enum nft_data_types type, unsigned int len)
4558 struct nlattr *nest;
4561 nest = nla_nest_start(skb, attr);
4566 case NFT_DATA_VALUE:
4567 err = nft_value_dump(skb, data, len);
4569 case NFT_DATA_VERDICT:
4570 err = nft_verdict_dump(skb, data);
4577 nla_nest_end(skb, nest);
4580 EXPORT_SYMBOL_GPL(nft_data_dump);
4582 static int nf_tables_init_net(struct net *net)
4584 INIT_LIST_HEAD(&net->nft.af_info);
4585 INIT_LIST_HEAD(&net->nft.commit_list);
4586 net->nft.base_seq = 1;
4590 static struct pernet_operations nf_tables_net_ops = {
4591 .init = nf_tables_init_net,
4594 static int __init nf_tables_module_init(void)
4598 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4605 err = nf_tables_core_module_init();
4609 err = nfnetlink_subsys_register(&nf_tables_subsys);
4613 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4614 return register_pernet_subsys(&nf_tables_net_ops);
4616 nf_tables_core_module_exit();
4623 static void __exit nf_tables_module_exit(void)
4625 unregister_pernet_subsys(&nf_tables_net_ops);
4626 nfnetlink_subsys_unregister(&nf_tables_subsys);
4628 nf_tables_core_module_exit();
4632 module_init(nf_tables_module_init);
4633 module_exit(nf_tables_module_exit);
4635 MODULE_LICENSE("GPL");
4636 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4637 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);