2 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/list.h>
14 #include <linux/skbuff.h>
15 #include <linux/netlink.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_tables_core.h>
20 #include <net/netfilter/nf_tables.h>
21 #include <net/net_namespace.h>
24 static LIST_HEAD(nf_tables_expressions);
27 * nft_register_afinfo - register nf_tables address family info
29 * @afi: address family info to register
31 * Register the address family for use with nf_tables. Returns zero on
32 * success or a negative errno code otherwise.
34 int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
36 INIT_LIST_HEAD(&afi->tables);
37 nfnl_lock(NFNL_SUBSYS_NFTABLES);
38 list_add_tail_rcu(&afi->list, &net->nft.af_info);
39 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
42 EXPORT_SYMBOL_GPL(nft_register_afinfo);
45 * nft_unregister_afinfo - unregister nf_tables address family info
47 * @afi: address family info to unregister
49 * Unregister the address family for use with nf_tables.
51 void nft_unregister_afinfo(struct nft_af_info *afi)
53 nfnl_lock(NFNL_SUBSYS_NFTABLES);
54 list_del_rcu(&afi->list);
55 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
57 EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
59 static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
61 struct nft_af_info *afi;
63 list_for_each_entry(afi, &net->nft.af_info, list) {
64 if (afi->family == family)
70 static struct nft_af_info *
71 nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
73 struct nft_af_info *afi;
75 afi = nft_afinfo_lookup(net, family);
80 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
81 request_module("nft-afinfo-%u", family);
82 nfnl_lock(NFNL_SUBSYS_NFTABLES);
83 afi = nft_afinfo_lookup(net, family);
85 return ERR_PTR(-EAGAIN);
88 return ERR_PTR(-EAFNOSUPPORT);
91 static void nft_ctx_init(struct nft_ctx *ctx,
92 const struct sk_buff *skb,
93 const struct nlmsghdr *nlh,
94 struct nft_af_info *afi,
95 struct nft_table *table,
96 struct nft_chain *chain,
97 const struct nlattr * const *nla)
99 ctx->net = sock_net(skb->sk);
104 ctx->portid = NETLINK_CB(skb).portid;
105 ctx->report = nlmsg_report(nlh);
106 ctx->seq = nlh->nlmsg_seq;
109 static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type,
112 struct nft_trans *trans;
114 trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL);
118 trans->msg_type = msg_type;
124 static void nft_trans_destroy(struct nft_trans *trans)
126 list_del(&trans->list);
130 static void nf_tables_unregister_hooks(const struct nft_table *table,
131 const struct nft_chain *chain,
132 unsigned int hook_nops)
134 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
135 chain->flags & NFT_BASE_CHAIN)
136 nf_unregister_hooks(nft_base_chain(chain)->ops, hook_nops);
139 /* Internal table flags */
140 #define NFT_TABLE_INACTIVE (1 << 15)
142 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
144 struct nft_trans *trans;
146 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
150 if (msg_type == NFT_MSG_NEWTABLE)
151 ctx->table->flags |= NFT_TABLE_INACTIVE;
153 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
157 static int nft_deltable(struct nft_ctx *ctx)
161 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
165 list_del_rcu(&ctx->table->list);
169 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
171 struct nft_trans *trans;
173 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
177 if (msg_type == NFT_MSG_NEWCHAIN)
178 ctx->chain->flags |= NFT_CHAIN_INACTIVE;
180 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
184 static int nft_delchain(struct nft_ctx *ctx)
188 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
193 list_del_rcu(&ctx->chain->list);
199 nft_rule_is_active(struct net *net, const struct nft_rule *rule)
201 return (rule->genmask & (1 << net->nft.gencursor)) == 0;
204 static inline int gencursor_next(struct net *net)
206 return net->nft.gencursor+1 == 1 ? 1 : 0;
210 nft_rule_is_active_next(struct net *net, const struct nft_rule *rule)
212 return (rule->genmask & (1 << gencursor_next(net))) == 0;
216 nft_rule_activate_next(struct net *net, struct nft_rule *rule)
218 /* Now inactive, will be active in the future */
219 rule->genmask = (1 << net->nft.gencursor);
223 nft_rule_deactivate_next(struct net *net, struct nft_rule *rule)
225 rule->genmask = (1 << gencursor_next(net));
228 static inline void nft_rule_clear(struct net *net, struct nft_rule *rule)
234 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
236 /* You cannot delete the same rule twice */
237 if (nft_rule_is_active_next(ctx->net, rule)) {
238 nft_rule_deactivate_next(ctx->net, rule);
245 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
246 struct nft_rule *rule)
248 struct nft_trans *trans;
250 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
254 nft_trans_rule(trans) = rule;
255 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
260 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
262 struct nft_trans *trans;
265 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
269 err = nf_tables_delrule_deactivate(ctx, rule);
271 nft_trans_destroy(trans);
278 static int nft_delrule_by_chain(struct nft_ctx *ctx)
280 struct nft_rule *rule;
283 list_for_each_entry(rule, &ctx->chain->rules, list) {
284 err = nft_delrule(ctx, rule);
291 /* Internal set flag */
292 #define NFT_SET_INACTIVE (1 << 15)
294 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
297 struct nft_trans *trans;
299 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
303 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
304 nft_trans_set_id(trans) =
305 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
306 set->flags |= NFT_SET_INACTIVE;
308 nft_trans_set(trans) = set;
309 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
314 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
318 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
322 list_del_rcu(&set->list);
332 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
333 const struct nlattr *nla)
335 struct nft_table *table;
337 list_for_each_entry(table, &afi->tables, list) {
338 if (!nla_strcmp(nla, table->name))
344 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
345 const struct nlattr *nla)
347 struct nft_table *table;
350 return ERR_PTR(-EINVAL);
352 table = nft_table_lookup(afi, nla);
356 return ERR_PTR(-ENOENT);
359 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
361 return ++table->hgenerator;
364 static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
366 static const struct nf_chain_type *
367 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
371 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
372 if (chain_type[family][i] != NULL &&
373 !nla_strcmp(nla, chain_type[family][i]->name))
374 return chain_type[family][i];
379 static const struct nf_chain_type *
380 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
381 const struct nlattr *nla,
384 const struct nf_chain_type *type;
386 type = __nf_tables_chain_type_lookup(afi->family, nla);
389 #ifdef CONFIG_MODULES
391 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
392 request_module("nft-chain-%u-%.*s", afi->family,
393 nla_len(nla), (const char *)nla_data(nla));
394 nfnl_lock(NFNL_SUBSYS_NFTABLES);
395 type = __nf_tables_chain_type_lookup(afi->family, nla);
397 return ERR_PTR(-EAGAIN);
400 return ERR_PTR(-ENOENT);
403 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
404 [NFTA_TABLE_NAME] = { .type = NLA_STRING },
405 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
408 static int nf_tables_fill_table_info(struct sk_buff *skb, u32 portid, u32 seq,
409 int event, u32 flags, int family,
410 const struct nft_table *table)
412 struct nlmsghdr *nlh;
413 struct nfgenmsg *nfmsg;
415 event |= NFNL_SUBSYS_NFTABLES << 8;
416 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
418 goto nla_put_failure;
420 nfmsg = nlmsg_data(nlh);
421 nfmsg->nfgen_family = family;
422 nfmsg->version = NFNETLINK_V0;
425 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
426 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
427 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
428 goto nla_put_failure;
430 return nlmsg_end(skb, nlh);
433 nlmsg_trim(skb, nlh);
437 static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
443 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
447 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
451 err = nf_tables_fill_table_info(skb, ctx->portid, ctx->seq, event, 0,
452 ctx->afi->family, ctx->table);
458 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
459 ctx->report, GFP_KERNEL);
462 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
468 static int nf_tables_dump_tables(struct sk_buff *skb,
469 struct netlink_callback *cb)
471 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
472 const struct nft_af_info *afi;
473 const struct nft_table *table;
474 unsigned int idx = 0, s_idx = cb->args[0];
475 struct net *net = sock_net(skb->sk);
476 int family = nfmsg->nfgen_family;
479 cb->seq = net->nft.base_seq;
481 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
482 if (family != NFPROTO_UNSPEC && family != afi->family)
485 list_for_each_entry_rcu(table, &afi->tables, list) {
489 memset(&cb->args[1], 0,
490 sizeof(cb->args) - sizeof(cb->args[0]));
491 if (nf_tables_fill_table_info(skb,
492 NETLINK_CB(cb->skb).portid,
496 afi->family, table) < 0)
499 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
510 static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb,
511 const struct nlmsghdr *nlh,
512 const struct nlattr * const nla[])
514 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
515 const struct nft_af_info *afi;
516 const struct nft_table *table;
517 struct sk_buff *skb2;
518 struct net *net = sock_net(skb->sk);
519 int family = nfmsg->nfgen_family;
522 if (nlh->nlmsg_flags & NLM_F_DUMP) {
523 struct netlink_dump_control c = {
524 .dump = nf_tables_dump_tables,
526 return netlink_dump_start(nlsk, skb, nlh, &c);
529 afi = nf_tables_afinfo_lookup(net, family, false);
533 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
535 return PTR_ERR(table);
536 if (table->flags & NFT_TABLE_INACTIVE)
539 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
543 err = nf_tables_fill_table_info(skb2, NETLINK_CB(skb).portid,
544 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
549 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
556 static int nf_tables_table_enable(const struct nft_af_info *afi,
557 struct nft_table *table)
559 struct nft_chain *chain;
562 list_for_each_entry(chain, &table->chains, list) {
563 if (!(chain->flags & NFT_BASE_CHAIN))
566 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
574 list_for_each_entry(chain, &table->chains, list) {
575 if (!(chain->flags & NFT_BASE_CHAIN))
581 nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops);
586 static void nf_tables_table_disable(const struct nft_af_info *afi,
587 struct nft_table *table)
589 struct nft_chain *chain;
591 list_for_each_entry(chain, &table->chains, list) {
592 if (chain->flags & NFT_BASE_CHAIN)
593 nf_unregister_hooks(nft_base_chain(chain)->ops,
598 static int nf_tables_updtable(struct nft_ctx *ctx)
600 struct nft_trans *trans;
604 if (!ctx->nla[NFTA_TABLE_FLAGS])
607 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
608 if (flags & ~NFT_TABLE_F_DORMANT)
611 if (flags == ctx->table->flags)
614 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
615 sizeof(struct nft_trans_table));
619 if ((flags & NFT_TABLE_F_DORMANT) &&
620 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
621 nft_trans_table_enable(trans) = false;
622 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
623 ctx->table->flags & NFT_TABLE_F_DORMANT) {
624 ret = nf_tables_table_enable(ctx->afi, ctx->table);
626 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
627 nft_trans_table_enable(trans) = true;
633 nft_trans_table_update(trans) = true;
634 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
637 nft_trans_destroy(trans);
641 static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
642 const struct nlmsghdr *nlh,
643 const struct nlattr * const nla[])
645 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
646 const struct nlattr *name;
647 struct nft_af_info *afi;
648 struct nft_table *table;
649 struct net *net = sock_net(skb->sk);
650 int family = nfmsg->nfgen_family;
655 afi = nf_tables_afinfo_lookup(net, family, true);
659 name = nla[NFTA_TABLE_NAME];
660 table = nf_tables_table_lookup(afi, name);
662 if (PTR_ERR(table) != -ENOENT)
663 return PTR_ERR(table);
668 if (table->flags & NFT_TABLE_INACTIVE)
670 if (nlh->nlmsg_flags & NLM_F_EXCL)
672 if (nlh->nlmsg_flags & NLM_F_REPLACE)
675 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
676 return nf_tables_updtable(&ctx);
679 if (nla[NFTA_TABLE_FLAGS]) {
680 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
681 if (flags & ~NFT_TABLE_F_DORMANT)
685 if (!try_module_get(afi->owner))
686 return -EAFNOSUPPORT;
688 table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL);
690 module_put(afi->owner);
694 nla_strlcpy(table->name, name, nla_len(name));
695 INIT_LIST_HEAD(&table->chains);
696 INIT_LIST_HEAD(&table->sets);
697 table->flags = flags;
699 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
700 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
703 module_put(afi->owner);
706 list_add_tail_rcu(&table->list, &afi->tables);
710 static int nft_flush_table(struct nft_ctx *ctx)
713 struct nft_chain *chain, *nc;
714 struct nft_set *set, *ns;
716 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
719 err = nft_delrule_by_chain(ctx);
723 err = nft_delchain(ctx);
728 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
729 if (set->flags & NFT_SET_ANONYMOUS &&
730 !list_empty(&set->bindings))
733 err = nft_delset(ctx, set);
738 err = nft_deltable(ctx);
743 static int nft_flush(struct nft_ctx *ctx, int family)
745 struct nft_af_info *afi;
746 struct nft_table *table, *nt;
747 const struct nlattr * const *nla = ctx->nla;
750 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
751 if (family != AF_UNSPEC && afi->family != family)
755 list_for_each_entry_safe(table, nt, &afi->tables, list) {
756 if (nla[NFTA_TABLE_NAME] &&
757 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
762 err = nft_flush_table(ctx);
771 static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb,
772 const struct nlmsghdr *nlh,
773 const struct nlattr * const nla[])
775 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
776 struct nft_af_info *afi;
777 struct nft_table *table;
778 struct net *net = sock_net(skb->sk);
779 int family = nfmsg->nfgen_family;
782 nft_ctx_init(&ctx, skb, nlh, NULL, NULL, NULL, nla);
783 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
784 return nft_flush(&ctx, family);
786 afi = nf_tables_afinfo_lookup(net, family, false);
790 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
792 return PTR_ERR(table);
793 if (table->flags & NFT_TABLE_INACTIVE)
799 return nft_flush_table(&ctx);
802 static void nf_tables_table_destroy(struct nft_ctx *ctx)
804 BUG_ON(ctx->table->use > 0);
807 module_put(ctx->afi->owner);
810 int nft_register_chain_type(const struct nf_chain_type *ctype)
814 nfnl_lock(NFNL_SUBSYS_NFTABLES);
815 if (chain_type[ctype->family][ctype->type] != NULL) {
819 chain_type[ctype->family][ctype->type] = ctype;
821 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
824 EXPORT_SYMBOL_GPL(nft_register_chain_type);
826 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
828 nfnl_lock(NFNL_SUBSYS_NFTABLES);
829 chain_type[ctype->family][ctype->type] = NULL;
830 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
832 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
838 static struct nft_chain *
839 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
841 struct nft_chain *chain;
843 list_for_each_entry(chain, &table->chains, list) {
844 if (chain->handle == handle)
848 return ERR_PTR(-ENOENT);
851 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
852 const struct nlattr *nla)
854 struct nft_chain *chain;
857 return ERR_PTR(-EINVAL);
859 list_for_each_entry(chain, &table->chains, list) {
860 if (!nla_strcmp(nla, chain->name))
864 return ERR_PTR(-ENOENT);
867 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
868 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
869 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
870 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
871 .len = NFT_CHAIN_MAXNAMELEN - 1 },
872 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
873 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
874 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
875 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
878 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
879 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
880 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
883 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
885 struct nft_stats *cpu_stats, total;
891 memset(&total, 0, sizeof(total));
892 for_each_possible_cpu(cpu) {
893 cpu_stats = per_cpu_ptr(stats, cpu);
895 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
896 pkts = cpu_stats->pkts;
897 bytes = cpu_stats->bytes;
898 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
900 total.bytes += bytes;
902 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
904 goto nla_put_failure;
906 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) ||
907 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes)))
908 goto nla_put_failure;
910 nla_nest_end(skb, nest);
917 static int nf_tables_fill_chain_info(struct sk_buff *skb, u32 portid, u32 seq,
918 int event, u32 flags, int family,
919 const struct nft_table *table,
920 const struct nft_chain *chain)
922 struct nlmsghdr *nlh;
923 struct nfgenmsg *nfmsg;
925 event |= NFNL_SUBSYS_NFTABLES << 8;
926 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
928 goto nla_put_failure;
930 nfmsg = nlmsg_data(nlh);
931 nfmsg->nfgen_family = family;
932 nfmsg->version = NFNETLINK_V0;
935 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
936 goto nla_put_failure;
937 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle)))
938 goto nla_put_failure;
939 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
940 goto nla_put_failure;
942 if (chain->flags & NFT_BASE_CHAIN) {
943 const struct nft_base_chain *basechain = nft_base_chain(chain);
944 const struct nf_hook_ops *ops = &basechain->ops[0];
947 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
949 goto nla_put_failure;
950 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
951 goto nla_put_failure;
952 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
953 goto nla_put_failure;
954 nla_nest_end(skb, nest);
956 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
957 htonl(basechain->policy)))
958 goto nla_put_failure;
960 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
961 goto nla_put_failure;
963 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
964 goto nla_put_failure;
967 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
968 goto nla_put_failure;
970 return nlmsg_end(skb, nlh);
973 nlmsg_trim(skb, nlh);
977 static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
983 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
987 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
991 err = nf_tables_fill_chain_info(skb, ctx->portid, ctx->seq, event, 0,
992 ctx->afi->family, ctx->table,
999 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1000 ctx->report, GFP_KERNEL);
1003 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1009 static int nf_tables_dump_chains(struct sk_buff *skb,
1010 struct netlink_callback *cb)
1012 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1013 const struct nft_af_info *afi;
1014 const struct nft_table *table;
1015 const struct nft_chain *chain;
1016 unsigned int idx = 0, s_idx = cb->args[0];
1017 struct net *net = sock_net(skb->sk);
1018 int family = nfmsg->nfgen_family;
1021 cb->seq = net->nft.base_seq;
1023 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1024 if (family != NFPROTO_UNSPEC && family != afi->family)
1027 list_for_each_entry_rcu(table, &afi->tables, list) {
1028 list_for_each_entry_rcu(chain, &table->chains, list) {
1032 memset(&cb->args[1], 0,
1033 sizeof(cb->args) - sizeof(cb->args[0]));
1034 if (nf_tables_fill_chain_info(skb, NETLINK_CB(cb->skb).portid,
1038 afi->family, table, chain) < 0)
1041 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1053 static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb,
1054 const struct nlmsghdr *nlh,
1055 const struct nlattr * const nla[])
1057 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1058 const struct nft_af_info *afi;
1059 const struct nft_table *table;
1060 const struct nft_chain *chain;
1061 struct sk_buff *skb2;
1062 struct net *net = sock_net(skb->sk);
1063 int family = nfmsg->nfgen_family;
1066 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1067 struct netlink_dump_control c = {
1068 .dump = nf_tables_dump_chains,
1070 return netlink_dump_start(nlsk, skb, nlh, &c);
1073 afi = nf_tables_afinfo_lookup(net, family, false);
1075 return PTR_ERR(afi);
1077 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1079 return PTR_ERR(table);
1080 if (table->flags & NFT_TABLE_INACTIVE)
1083 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1085 return PTR_ERR(chain);
1086 if (chain->flags & NFT_CHAIN_INACTIVE)
1089 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1093 err = nf_tables_fill_chain_info(skb2, NETLINK_CB(skb).portid,
1094 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1095 family, table, chain);
1099 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1106 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1107 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1108 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1111 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1113 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1114 struct nft_stats __percpu *newstats;
1115 struct nft_stats *stats;
1118 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1120 return ERR_PTR(err);
1122 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1123 return ERR_PTR(-EINVAL);
1125 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1126 if (newstats == NULL)
1127 return ERR_PTR(-ENOMEM);
1129 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1130 * are not exposed to userspace.
1132 stats = this_cpu_ptr(newstats);
1133 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1134 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1139 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1140 struct nft_stats __percpu *newstats)
1142 if (newstats == NULL)
1146 struct nft_stats __percpu *oldstats =
1147 nft_dereference(chain->stats);
1149 rcu_assign_pointer(chain->stats, newstats);
1151 free_percpu(oldstats);
1153 rcu_assign_pointer(chain->stats, newstats);
1156 static void nf_tables_chain_destroy(struct nft_chain *chain)
1158 BUG_ON(chain->use > 0);
1160 if (chain->flags & NFT_BASE_CHAIN) {
1161 module_put(nft_base_chain(chain)->type->owner);
1162 free_percpu(nft_base_chain(chain)->stats);
1163 kfree(nft_base_chain(chain));
1169 static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
1170 const struct nlmsghdr *nlh,
1171 const struct nlattr * const nla[])
1173 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1174 const struct nlattr * uninitialized_var(name);
1175 struct nft_af_info *afi;
1176 struct nft_table *table;
1177 struct nft_chain *chain;
1178 struct nft_base_chain *basechain = NULL;
1179 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1180 struct net *net = sock_net(skb->sk);
1181 int family = nfmsg->nfgen_family;
1182 u8 policy = NF_ACCEPT;
1185 struct nft_stats __percpu *stats;
1190 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1192 afi = nf_tables_afinfo_lookup(net, family, true);
1194 return PTR_ERR(afi);
1196 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1198 return PTR_ERR(table);
1201 name = nla[NFTA_CHAIN_NAME];
1203 if (nla[NFTA_CHAIN_HANDLE]) {
1204 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1205 chain = nf_tables_chain_lookup_byhandle(table, handle);
1207 return PTR_ERR(chain);
1209 chain = nf_tables_chain_lookup(table, name);
1210 if (IS_ERR(chain)) {
1211 if (PTR_ERR(chain) != -ENOENT)
1212 return PTR_ERR(chain);
1217 if (nla[NFTA_CHAIN_POLICY]) {
1218 if ((chain != NULL &&
1219 !(chain->flags & NFT_BASE_CHAIN)) ||
1220 nla[NFTA_CHAIN_HOOK] == NULL)
1223 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1233 if (chain != NULL) {
1234 struct nft_stats *stats = NULL;
1235 struct nft_trans *trans;
1237 if (chain->flags & NFT_CHAIN_INACTIVE)
1239 if (nlh->nlmsg_flags & NLM_F_EXCL)
1241 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1244 if (nla[NFTA_CHAIN_HANDLE] && name &&
1245 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
1248 if (nla[NFTA_CHAIN_COUNTERS]) {
1249 if (!(chain->flags & NFT_BASE_CHAIN))
1252 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1254 return PTR_ERR(stats);
1257 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1258 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1259 sizeof(struct nft_trans_chain));
1263 nft_trans_chain_stats(trans) = stats;
1264 nft_trans_chain_update(trans) = true;
1266 if (nla[NFTA_CHAIN_POLICY])
1267 nft_trans_chain_policy(trans) = policy;
1269 nft_trans_chain_policy(trans) = -1;
1271 if (nla[NFTA_CHAIN_HANDLE] && name) {
1272 nla_strlcpy(nft_trans_chain_name(trans), name,
1273 NFT_CHAIN_MAXNAMELEN);
1275 list_add_tail(&trans->list, &net->nft.commit_list);
1279 if (table->use == UINT_MAX)
1282 if (nla[NFTA_CHAIN_HOOK]) {
1283 const struct nf_chain_type *type;
1284 struct nf_hook_ops *ops;
1286 u32 hooknum, priority;
1288 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1289 if (nla[NFTA_CHAIN_TYPE]) {
1290 type = nf_tables_chain_type_lookup(afi,
1291 nla[NFTA_CHAIN_TYPE],
1294 return PTR_ERR(type);
1297 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1301 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1302 ha[NFTA_HOOK_PRIORITY] == NULL)
1305 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1306 if (hooknum >= afi->nhooks)
1308 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1310 if (!(type->hook_mask & (1 << hooknum)))
1312 if (!try_module_get(type->owner))
1314 hookfn = type->hooks[hooknum];
1316 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1317 if (basechain == NULL)
1320 if (nla[NFTA_CHAIN_COUNTERS]) {
1321 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1322 if (IS_ERR(stats)) {
1323 module_put(type->owner);
1325 return PTR_ERR(stats);
1327 basechain->stats = stats;
1329 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1330 if (IS_ERR(stats)) {
1331 module_put(type->owner);
1333 return PTR_ERR(stats);
1335 rcu_assign_pointer(basechain->stats, stats);
1338 basechain->type = type;
1339 chain = &basechain->chain;
1341 for (i = 0; i < afi->nops; i++) {
1342 ops = &basechain->ops[i];
1344 ops->owner = afi->owner;
1345 ops->hooknum = hooknum;
1346 ops->priority = priority;
1348 ops->hook = afi->hooks[ops->hooknum];
1351 if (afi->hook_ops_init)
1352 afi->hook_ops_init(ops, i);
1355 chain->flags |= NFT_BASE_CHAIN;
1356 basechain->policy = policy;
1358 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1363 INIT_LIST_HEAD(&chain->rules);
1364 chain->handle = nf_tables_alloc_handle(table);
1366 chain->table = table;
1367 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1369 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1370 chain->flags & NFT_BASE_CHAIN) {
1371 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
1376 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1377 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1382 list_add_tail_rcu(&chain->list, &table->chains);
1385 nf_tables_unregister_hooks(table, chain, afi->nops);
1387 nf_tables_chain_destroy(chain);
1391 static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
1392 const struct nlmsghdr *nlh,
1393 const struct nlattr * const nla[])
1395 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1396 struct nft_af_info *afi;
1397 struct nft_table *table;
1398 struct nft_chain *chain;
1399 struct net *net = sock_net(skb->sk);
1400 int family = nfmsg->nfgen_family;
1403 afi = nf_tables_afinfo_lookup(net, family, false);
1405 return PTR_ERR(afi);
1407 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1409 return PTR_ERR(table);
1410 if (table->flags & NFT_TABLE_INACTIVE)
1413 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1415 return PTR_ERR(chain);
1416 if (chain->flags & NFT_CHAIN_INACTIVE)
1421 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1423 return nft_delchain(&ctx);
1431 * nft_register_expr - register nf_tables expr type
1434 * Registers the expr type for use with nf_tables. Returns zero on
1435 * success or a negative errno code otherwise.
1437 int nft_register_expr(struct nft_expr_type *type)
1439 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1440 if (type->family == NFPROTO_UNSPEC)
1441 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1443 list_add_rcu(&type->list, &nf_tables_expressions);
1444 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1447 EXPORT_SYMBOL_GPL(nft_register_expr);
1450 * nft_unregister_expr - unregister nf_tables expr type
1453 * Unregisters the expr typefor use with nf_tables.
1455 void nft_unregister_expr(struct nft_expr_type *type)
1457 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1458 list_del_rcu(&type->list);
1459 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1461 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1463 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1466 const struct nft_expr_type *type;
1468 list_for_each_entry(type, &nf_tables_expressions, list) {
1469 if (!nla_strcmp(nla, type->name) &&
1470 (!type->family || type->family == family))
1476 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1479 const struct nft_expr_type *type;
1482 return ERR_PTR(-EINVAL);
1484 type = __nft_expr_type_get(family, nla);
1485 if (type != NULL && try_module_get(type->owner))
1488 #ifdef CONFIG_MODULES
1490 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1491 request_module("nft-expr-%u-%.*s", family,
1492 nla_len(nla), (char *)nla_data(nla));
1493 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1494 if (__nft_expr_type_get(family, nla))
1495 return ERR_PTR(-EAGAIN);
1497 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1498 request_module("nft-expr-%.*s",
1499 nla_len(nla), (char *)nla_data(nla));
1500 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1501 if (__nft_expr_type_get(family, nla))
1502 return ERR_PTR(-EAGAIN);
1505 return ERR_PTR(-ENOENT);
1508 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1509 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1510 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1513 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1514 const struct nft_expr *expr)
1516 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1517 goto nla_put_failure;
1519 if (expr->ops->dump) {
1520 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1522 goto nla_put_failure;
1523 if (expr->ops->dump(skb, expr) < 0)
1524 goto nla_put_failure;
1525 nla_nest_end(skb, data);
1534 struct nft_expr_info {
1535 const struct nft_expr_ops *ops;
1536 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1539 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1540 const struct nlattr *nla,
1541 struct nft_expr_info *info)
1543 const struct nft_expr_type *type;
1544 const struct nft_expr_ops *ops;
1545 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1548 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1552 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1554 return PTR_ERR(type);
1556 if (tb[NFTA_EXPR_DATA]) {
1557 err = nla_parse_nested(info->tb, type->maxattr,
1558 tb[NFTA_EXPR_DATA], type->policy);
1562 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1564 if (type->select_ops != NULL) {
1565 ops = type->select_ops(ctx,
1566 (const struct nlattr * const *)info->tb);
1578 module_put(type->owner);
1582 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1583 const struct nft_expr_info *info,
1584 struct nft_expr *expr)
1586 const struct nft_expr_ops *ops = info->ops;
1591 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1603 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1604 struct nft_expr *expr)
1606 if (expr->ops->destroy)
1607 expr->ops->destroy(ctx, expr);
1608 module_put(expr->ops->type->owner);
1615 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1618 struct nft_rule *rule;
1620 // FIXME: this sucks
1621 list_for_each_entry(rule, &chain->rules, list) {
1622 if (handle == rule->handle)
1626 return ERR_PTR(-ENOENT);
1629 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1630 const struct nlattr *nla)
1633 return ERR_PTR(-EINVAL);
1635 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1638 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1639 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1640 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1641 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1642 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1643 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1644 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1645 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1646 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1647 .len = NFT_USERDATA_MAXLEN },
1650 static int nf_tables_fill_rule_info(struct sk_buff *skb, u32 portid, u32 seq,
1651 int event, u32 flags, int family,
1652 const struct nft_table *table,
1653 const struct nft_chain *chain,
1654 const struct nft_rule *rule)
1656 struct nlmsghdr *nlh;
1657 struct nfgenmsg *nfmsg;
1658 const struct nft_expr *expr, *next;
1659 struct nlattr *list;
1660 const struct nft_rule *prule;
1661 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1663 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1666 goto nla_put_failure;
1668 nfmsg = nlmsg_data(nlh);
1669 nfmsg->nfgen_family = family;
1670 nfmsg->version = NFNETLINK_V0;
1673 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1674 goto nla_put_failure;
1675 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1676 goto nla_put_failure;
1677 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle)))
1678 goto nla_put_failure;
1680 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1681 prule = list_entry(rule->list.prev, struct nft_rule, list);
1682 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1683 cpu_to_be64(prule->handle)))
1684 goto nla_put_failure;
1687 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1689 goto nla_put_failure;
1690 nft_rule_for_each_expr(expr, next, rule) {
1691 struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM);
1693 goto nla_put_failure;
1694 if (nf_tables_fill_expr_info(skb, expr) < 0)
1695 goto nla_put_failure;
1696 nla_nest_end(skb, elem);
1698 nla_nest_end(skb, list);
1701 nla_put(skb, NFTA_RULE_USERDATA, rule->ulen, nft_userdata(rule)))
1702 goto nla_put_failure;
1704 return nlmsg_end(skb, nlh);
1707 nlmsg_trim(skb, nlh);
1711 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1712 const struct nft_rule *rule,
1715 struct sk_buff *skb;
1719 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1723 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1727 err = nf_tables_fill_rule_info(skb, ctx->portid, ctx->seq, event, 0,
1728 ctx->afi->family, ctx->table,
1735 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1736 ctx->report, GFP_KERNEL);
1739 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1745 static int nf_tables_dump_rules(struct sk_buff *skb,
1746 struct netlink_callback *cb)
1748 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1749 const struct nft_af_info *afi;
1750 const struct nft_table *table;
1751 const struct nft_chain *chain;
1752 const struct nft_rule *rule;
1753 unsigned int idx = 0, s_idx = cb->args[0];
1754 struct net *net = sock_net(skb->sk);
1755 int family = nfmsg->nfgen_family;
1758 cb->seq = net->nft.base_seq;
1760 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1761 if (family != NFPROTO_UNSPEC && family != afi->family)
1764 list_for_each_entry_rcu(table, &afi->tables, list) {
1765 list_for_each_entry_rcu(chain, &table->chains, list) {
1766 list_for_each_entry_rcu(rule, &chain->rules, list) {
1767 if (!nft_rule_is_active(net, rule))
1772 memset(&cb->args[1], 0,
1773 sizeof(cb->args) - sizeof(cb->args[0]));
1774 if (nf_tables_fill_rule_info(skb, NETLINK_CB(cb->skb).portid,
1777 NLM_F_MULTI | NLM_F_APPEND,
1778 afi->family, table, chain, rule) < 0)
1781 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1795 static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
1796 const struct nlmsghdr *nlh,
1797 const struct nlattr * const nla[])
1799 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1800 const struct nft_af_info *afi;
1801 const struct nft_table *table;
1802 const struct nft_chain *chain;
1803 const struct nft_rule *rule;
1804 struct sk_buff *skb2;
1805 struct net *net = sock_net(skb->sk);
1806 int family = nfmsg->nfgen_family;
1809 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1810 struct netlink_dump_control c = {
1811 .dump = nf_tables_dump_rules,
1813 return netlink_dump_start(nlsk, skb, nlh, &c);
1816 afi = nf_tables_afinfo_lookup(net, family, false);
1818 return PTR_ERR(afi);
1820 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1822 return PTR_ERR(table);
1823 if (table->flags & NFT_TABLE_INACTIVE)
1826 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1828 return PTR_ERR(chain);
1829 if (chain->flags & NFT_CHAIN_INACTIVE)
1832 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1834 return PTR_ERR(rule);
1836 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1840 err = nf_tables_fill_rule_info(skb2, NETLINK_CB(skb).portid,
1841 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1842 family, table, chain, rule);
1846 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1853 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1854 struct nft_rule *rule)
1856 struct nft_expr *expr;
1859 * Careful: some expressions might not be initialized in case this
1860 * is called on error from nf_tables_newrule().
1862 expr = nft_expr_first(rule);
1863 while (expr->ops && expr != nft_expr_last(rule)) {
1864 nf_tables_expr_destroy(ctx, expr);
1865 expr = nft_expr_next(expr);
1870 #define NFT_RULE_MAXEXPRS 128
1872 static struct nft_expr_info *info;
1874 static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
1875 const struct nlmsghdr *nlh,
1876 const struct nlattr * const nla[])
1878 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1879 struct nft_af_info *afi;
1880 struct net *net = sock_net(skb->sk);
1881 struct nft_table *table;
1882 struct nft_chain *chain;
1883 struct nft_rule *rule, *old_rule = NULL;
1884 struct nft_trans *trans = NULL;
1885 struct nft_expr *expr;
1888 unsigned int size, i, n, ulen = 0;
1891 u64 handle, pos_handle;
1893 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1895 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
1897 return PTR_ERR(afi);
1899 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1901 return PTR_ERR(table);
1903 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1905 return PTR_ERR(chain);
1907 if (nla[NFTA_RULE_HANDLE]) {
1908 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
1909 rule = __nf_tables_rule_lookup(chain, handle);
1911 return PTR_ERR(rule);
1913 if (nlh->nlmsg_flags & NLM_F_EXCL)
1915 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1920 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
1922 handle = nf_tables_alloc_handle(table);
1924 if (chain->use == UINT_MAX)
1928 if (nla[NFTA_RULE_POSITION]) {
1929 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1932 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
1933 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
1934 if (IS_ERR(old_rule))
1935 return PTR_ERR(old_rule);
1938 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1942 if (nla[NFTA_RULE_EXPRESSIONS]) {
1943 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
1945 if (nla_type(tmp) != NFTA_LIST_ELEM)
1947 if (n == NFT_RULE_MAXEXPRS)
1949 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
1952 size += info[n].ops->size;
1957 if (nla[NFTA_RULE_USERDATA])
1958 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
1961 rule = kzalloc(sizeof(*rule) + size + ulen, GFP_KERNEL);
1965 nft_rule_activate_next(net, rule);
1967 rule->handle = handle;
1972 nla_memcpy(nft_userdata(rule), nla[NFTA_RULE_USERDATA], ulen);
1974 expr = nft_expr_first(rule);
1975 for (i = 0; i < n; i++) {
1976 err = nf_tables_newexpr(&ctx, &info[i], expr);
1980 expr = nft_expr_next(expr);
1983 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
1984 if (nft_rule_is_active_next(net, old_rule)) {
1985 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
1987 if (trans == NULL) {
1991 nft_rule_deactivate_next(net, old_rule);
1993 list_add_tail_rcu(&rule->list, &old_rule->list);
1998 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2000 list_add_rcu(&rule->list, &old_rule->list);
2002 list_add_tail_rcu(&rule->list, &chain->rules);
2005 list_add_tail_rcu(&rule->list, &old_rule->list);
2007 list_add_rcu(&rule->list, &chain->rules);
2010 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2018 list_del_rcu(&rule->list);
2020 list_del_rcu(&nft_trans_rule(trans)->list);
2021 nft_rule_clear(net, nft_trans_rule(trans));
2022 nft_trans_destroy(trans);
2026 nf_tables_rule_destroy(&ctx, rule);
2028 for (i = 0; i < n; i++) {
2029 if (info[i].ops != NULL)
2030 module_put(info[i].ops->type->owner);
2035 static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
2036 const struct nlmsghdr *nlh,
2037 const struct nlattr * const nla[])
2039 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2040 struct nft_af_info *afi;
2041 struct net *net = sock_net(skb->sk);
2042 struct nft_table *table;
2043 struct nft_chain *chain = NULL;
2044 struct nft_rule *rule;
2045 int family = nfmsg->nfgen_family, err = 0;
2048 afi = nf_tables_afinfo_lookup(net, family, false);
2050 return PTR_ERR(afi);
2052 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
2054 return PTR_ERR(table);
2055 if (table->flags & NFT_TABLE_INACTIVE)
2058 if (nla[NFTA_RULE_CHAIN]) {
2059 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2061 return PTR_ERR(chain);
2064 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
2067 if (nla[NFTA_RULE_HANDLE]) {
2068 rule = nf_tables_rule_lookup(chain,
2069 nla[NFTA_RULE_HANDLE]);
2071 return PTR_ERR(rule);
2073 err = nft_delrule(&ctx, rule);
2075 err = nft_delrule_by_chain(&ctx);
2078 list_for_each_entry(chain, &table->chains, list) {
2080 err = nft_delrule_by_chain(&ctx);
2093 static LIST_HEAD(nf_tables_set_ops);
2095 int nft_register_set(struct nft_set_ops *ops)
2097 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2098 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2099 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2102 EXPORT_SYMBOL_GPL(nft_register_set);
2104 void nft_unregister_set(struct nft_set_ops *ops)
2106 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2107 list_del_rcu(&ops->list);
2108 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2110 EXPORT_SYMBOL_GPL(nft_unregister_set);
2113 * Select a set implementation based on the data characteristics and the
2114 * given policy. The total memory use might not be known if no size is
2115 * given, in that case the amount of memory per element is used.
2117 static const struct nft_set_ops *
2118 nft_select_set_ops(const struct nlattr * const nla[],
2119 const struct nft_set_desc *desc,
2120 enum nft_set_policies policy)
2122 const struct nft_set_ops *ops, *bops;
2123 struct nft_set_estimate est, best;
2126 #ifdef CONFIG_MODULES
2127 if (list_empty(&nf_tables_set_ops)) {
2128 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2129 request_module("nft-set");
2130 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2131 if (!list_empty(&nf_tables_set_ops))
2132 return ERR_PTR(-EAGAIN);
2136 if (nla[NFTA_SET_FLAGS] != NULL) {
2137 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2138 features &= NFT_SET_INTERVAL | NFT_SET_MAP;
2145 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2146 if ((ops->features & features) != features)
2148 if (!ops->estimate(desc, features, &est))
2152 case NFT_SET_POL_PERFORMANCE:
2153 if (est.class < best.class)
2155 if (est.class == best.class && est.size < best.size)
2158 case NFT_SET_POL_MEMORY:
2159 if (est.size < best.size)
2161 if (est.size == best.size && est.class < best.class)
2168 if (!try_module_get(ops->owner))
2171 module_put(bops->owner);
2180 return ERR_PTR(-EOPNOTSUPP);
2183 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2184 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2185 [NFTA_SET_NAME] = { .type = NLA_STRING,
2186 .len = IFNAMSIZ - 1 },
2187 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2188 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2189 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2190 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2191 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2192 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2193 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2194 [NFTA_SET_ID] = { .type = NLA_U32 },
2197 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2198 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2201 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx,
2202 const struct sk_buff *skb,
2203 const struct nlmsghdr *nlh,
2204 const struct nlattr * const nla[])
2206 struct net *net = sock_net(skb->sk);
2207 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2208 struct nft_af_info *afi = NULL;
2209 struct nft_table *table = NULL;
2211 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2212 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2214 return PTR_ERR(afi);
2217 if (nla[NFTA_SET_TABLE] != NULL) {
2219 return -EAFNOSUPPORT;
2221 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2223 return PTR_ERR(table);
2224 if (table->flags & NFT_TABLE_INACTIVE)
2228 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2232 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2233 const struct nlattr *nla)
2235 struct nft_set *set;
2238 return ERR_PTR(-EINVAL);
2240 list_for_each_entry(set, &table->sets, list) {
2241 if (!nla_strcmp(nla, set->name))
2244 return ERR_PTR(-ENOENT);
2247 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2248 const struct nlattr *nla)
2250 struct nft_trans *trans;
2251 u32 id = ntohl(nla_get_be32(nla));
2253 list_for_each_entry(trans, &net->nft.commit_list, list) {
2254 if (trans->msg_type == NFT_MSG_NEWSET &&
2255 id == nft_trans_set_id(trans))
2256 return nft_trans_set(trans);
2258 return ERR_PTR(-ENOENT);
2261 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2264 const struct nft_set *i;
2266 unsigned long *inuse;
2267 unsigned int n = 0, min = 0;
2269 p = strnchr(name, IFNAMSIZ, '%');
2271 if (p[1] != 'd' || strchr(p + 2, '%'))
2274 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2278 list_for_each_entry(i, &ctx->table->sets, list) {
2281 if (!sscanf(i->name, name, &tmp))
2283 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2286 set_bit(tmp - min, inuse);
2289 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2290 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2291 min += BITS_PER_BYTE * PAGE_SIZE;
2292 memset(inuse, 0, PAGE_SIZE);
2295 free_page((unsigned long)inuse);
2298 snprintf(set->name, sizeof(set->name), name, min + n);
2299 list_for_each_entry(i, &ctx->table->sets, list) {
2300 if (!strcmp(set->name, i->name))
2306 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2307 const struct nft_set *set, u16 event, u16 flags)
2309 struct nfgenmsg *nfmsg;
2310 struct nlmsghdr *nlh;
2311 struct nlattr *desc;
2312 u32 portid = ctx->portid;
2315 event |= NFNL_SUBSYS_NFTABLES << 8;
2316 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2319 goto nla_put_failure;
2321 nfmsg = nlmsg_data(nlh);
2322 nfmsg->nfgen_family = ctx->afi->family;
2323 nfmsg->version = NFNETLINK_V0;
2326 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2327 goto nla_put_failure;
2328 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2329 goto nla_put_failure;
2330 if (set->flags != 0)
2331 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2332 goto nla_put_failure;
2334 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2335 goto nla_put_failure;
2336 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2337 goto nla_put_failure;
2338 if (set->flags & NFT_SET_MAP) {
2339 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2340 goto nla_put_failure;
2341 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2342 goto nla_put_failure;
2345 desc = nla_nest_start(skb, NFTA_SET_DESC);
2347 goto nla_put_failure;
2349 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2350 goto nla_put_failure;
2351 nla_nest_end(skb, desc);
2353 return nlmsg_end(skb, nlh);
2356 nlmsg_trim(skb, nlh);
2360 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2361 const struct nft_set *set,
2362 int event, gfp_t gfp_flags)
2364 struct sk_buff *skb;
2365 u32 portid = ctx->portid;
2369 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2373 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2377 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2383 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2384 ctx->report, gfp_flags);
2387 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2391 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2393 const struct nft_set *set;
2394 unsigned int idx, s_idx = cb->args[0];
2395 struct nft_af_info *afi;
2396 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2397 struct net *net = sock_net(skb->sk);
2398 int cur_family = cb->args[3];
2399 struct nft_ctx *ctx = cb->data, ctx_set;
2405 cb->seq = net->nft.base_seq;
2407 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2408 if (ctx->afi && ctx->afi != afi)
2412 if (afi->family != cur_family)
2417 list_for_each_entry_rcu(table, &afi->tables, list) {
2418 if (ctx->table && ctx->table != table)
2422 if (cur_table != table)
2428 list_for_each_entry_rcu(set, &table->sets, list) {
2433 ctx_set.table = table;
2435 if (nf_tables_fill_set(skb, &ctx_set, set,
2439 cb->args[2] = (unsigned long) table;
2440 cb->args[3] = afi->family;
2443 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2457 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2463 static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
2464 const struct nlmsghdr *nlh,
2465 const struct nlattr * const nla[])
2467 const struct nft_set *set;
2469 struct sk_buff *skb2;
2470 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2473 /* Verify existance before starting dump */
2474 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2478 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2479 struct netlink_dump_control c = {
2480 .dump = nf_tables_dump_sets,
2481 .done = nf_tables_dump_sets_done,
2483 struct nft_ctx *ctx_dump;
2485 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2486 if (ctx_dump == NULL)
2492 return netlink_dump_start(nlsk, skb, nlh, &c);
2495 /* Only accept unspec with dump */
2496 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2497 return -EAFNOSUPPORT;
2499 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2501 return PTR_ERR(set);
2502 if (set->flags & NFT_SET_INACTIVE)
2505 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2509 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2513 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2520 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2521 struct nft_set_desc *desc,
2522 const struct nlattr *nla)
2524 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2527 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2531 if (da[NFTA_SET_DESC_SIZE] != NULL)
2532 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2537 static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
2538 const struct nlmsghdr *nlh,
2539 const struct nlattr * const nla[])
2541 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2542 const struct nft_set_ops *ops;
2543 struct nft_af_info *afi;
2544 struct net *net = sock_net(skb->sk);
2545 struct nft_table *table;
2546 struct nft_set *set;
2548 char name[IFNAMSIZ];
2551 u32 ktype, dtype, flags, policy;
2552 struct nft_set_desc desc;
2555 if (nla[NFTA_SET_TABLE] == NULL ||
2556 nla[NFTA_SET_NAME] == NULL ||
2557 nla[NFTA_SET_KEY_LEN] == NULL ||
2558 nla[NFTA_SET_ID] == NULL)
2561 memset(&desc, 0, sizeof(desc));
2563 ktype = NFT_DATA_VALUE;
2564 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2565 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2566 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2570 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2571 if (desc.klen == 0 || desc.klen > FIELD_SIZEOF(struct nft_data, data))
2575 if (nla[NFTA_SET_FLAGS] != NULL) {
2576 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2577 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2578 NFT_SET_INTERVAL | NFT_SET_MAP))
2583 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2584 if (!(flags & NFT_SET_MAP))
2587 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2588 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2589 dtype != NFT_DATA_VERDICT)
2592 if (dtype != NFT_DATA_VERDICT) {
2593 if (nla[NFTA_SET_DATA_LEN] == NULL)
2595 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2596 if (desc.dlen == 0 ||
2597 desc.dlen > FIELD_SIZEOF(struct nft_data, data))
2600 desc.dlen = sizeof(struct nft_data);
2601 } else if (flags & NFT_SET_MAP)
2604 policy = NFT_SET_POL_PERFORMANCE;
2605 if (nla[NFTA_SET_POLICY] != NULL)
2606 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2608 if (nla[NFTA_SET_DESC] != NULL) {
2609 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2614 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2616 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2618 return PTR_ERR(afi);
2620 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2622 return PTR_ERR(table);
2624 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
2626 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2628 if (PTR_ERR(set) != -ENOENT)
2629 return PTR_ERR(set);
2634 if (nlh->nlmsg_flags & NLM_F_EXCL)
2636 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2641 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2644 ops = nft_select_set_ops(nla, &desc, policy);
2646 return PTR_ERR(ops);
2649 if (ops->privsize != NULL)
2650 size = ops->privsize(nla);
2653 set = kzalloc(sizeof(*set) + size, GFP_KERNEL);
2657 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2658 err = nf_tables_set_alloc_name(&ctx, set, name);
2662 INIT_LIST_HEAD(&set->bindings);
2665 set->klen = desc.klen;
2667 set->dlen = desc.dlen;
2669 set->size = desc.size;
2671 err = ops->init(set, &desc, nla);
2675 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2679 list_add_tail_rcu(&set->list, &table->sets);
2686 module_put(ops->owner);
2690 static void nft_set_destroy(struct nft_set *set)
2692 set->ops->destroy(set);
2693 module_put(set->ops->owner);
2697 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2699 list_del_rcu(&set->list);
2700 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
2701 nft_set_destroy(set);
2704 static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
2705 const struct nlmsghdr *nlh,
2706 const struct nlattr * const nla[])
2708 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2709 struct nft_set *set;
2713 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2714 return -EAFNOSUPPORT;
2715 if (nla[NFTA_SET_TABLE] == NULL)
2718 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2722 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2724 return PTR_ERR(set);
2725 if (set->flags & NFT_SET_INACTIVE)
2727 if (!list_empty(&set->bindings))
2730 return nft_delset(&ctx, set);
2733 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2734 const struct nft_set *set,
2735 const struct nft_set_iter *iter,
2736 const struct nft_set_elem *elem)
2738 enum nft_registers dreg;
2740 dreg = nft_type_to_reg(set->dtype);
2741 return nft_validate_data_load(ctx, dreg, &elem->data,
2742 set->dtype == NFT_DATA_VERDICT ?
2743 NFT_DATA_VERDICT : NFT_DATA_VALUE);
2746 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2747 struct nft_set_binding *binding)
2749 struct nft_set_binding *i;
2750 struct nft_set_iter iter;
2752 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2755 if (set->flags & NFT_SET_MAP) {
2756 /* If the set is already bound to the same chain all
2757 * jumps are already validated for that chain.
2759 list_for_each_entry(i, &set->bindings, list) {
2760 if (i->chain == binding->chain)
2767 iter.fn = nf_tables_bind_check_setelem;
2769 set->ops->walk(ctx, set, &iter);
2771 /* Destroy anonymous sets if binding fails */
2772 if (set->flags & NFT_SET_ANONYMOUS)
2773 nf_tables_set_destroy(ctx, set);
2779 binding->chain = ctx->chain;
2780 list_add_tail_rcu(&binding->list, &set->bindings);
2784 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2785 struct nft_set_binding *binding)
2787 list_del_rcu(&binding->list);
2789 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2790 !(set->flags & NFT_SET_INACTIVE))
2791 nf_tables_set_destroy(ctx, set);
2798 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
2799 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
2800 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
2801 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
2804 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
2805 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
2806 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
2807 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
2808 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
2811 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx,
2812 const struct sk_buff *skb,
2813 const struct nlmsghdr *nlh,
2814 const struct nlattr * const nla[],
2817 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2818 struct nft_af_info *afi;
2819 struct nft_table *table;
2820 struct net *net = sock_net(skb->sk);
2822 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2824 return PTR_ERR(afi);
2826 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
2828 return PTR_ERR(table);
2829 if (!trans && (table->flags & NFT_TABLE_INACTIVE))
2832 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2836 static int nf_tables_fill_setelem(struct sk_buff *skb,
2837 const struct nft_set *set,
2838 const struct nft_set_elem *elem)
2840 unsigned char *b = skb_tail_pointer(skb);
2841 struct nlattr *nest;
2843 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
2845 goto nla_put_failure;
2847 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE,
2849 goto nla_put_failure;
2851 if (set->flags & NFT_SET_MAP &&
2852 !(elem->flags & NFT_SET_ELEM_INTERVAL_END) &&
2853 nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data,
2854 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
2856 goto nla_put_failure;
2858 if (elem->flags != 0)
2859 if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags)))
2860 goto nla_put_failure;
2862 nla_nest_end(skb, nest);
2870 struct nft_set_dump_args {
2871 const struct netlink_callback *cb;
2872 struct nft_set_iter iter;
2873 struct sk_buff *skb;
2876 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
2877 const struct nft_set *set,
2878 const struct nft_set_iter *iter,
2879 const struct nft_set_elem *elem)
2881 struct nft_set_dump_args *args;
2883 args = container_of(iter, struct nft_set_dump_args, iter);
2884 return nf_tables_fill_setelem(args->skb, set, elem);
2887 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
2889 const struct nft_set *set;
2890 struct nft_set_dump_args args;
2892 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
2893 struct nfgenmsg *nfmsg;
2894 struct nlmsghdr *nlh;
2895 struct nlattr *nest;
2899 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
2900 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
2904 err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla,
2909 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2911 return PTR_ERR(set);
2912 if (set->flags & NFT_SET_INACTIVE)
2915 event = NFT_MSG_NEWSETELEM;
2916 event |= NFNL_SUBSYS_NFTABLES << 8;
2917 portid = NETLINK_CB(cb->skb).portid;
2918 seq = cb->nlh->nlmsg_seq;
2920 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2923 goto nla_put_failure;
2925 nfmsg = nlmsg_data(nlh);
2926 nfmsg->nfgen_family = ctx.afi->family;
2927 nfmsg->version = NFNETLINK_V0;
2930 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
2931 goto nla_put_failure;
2932 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
2933 goto nla_put_failure;
2935 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2937 goto nla_put_failure;
2941 args.iter.skip = cb->args[0];
2942 args.iter.count = 0;
2944 args.iter.fn = nf_tables_dump_setelem;
2945 set->ops->walk(&ctx, set, &args.iter);
2947 nla_nest_end(skb, nest);
2948 nlmsg_end(skb, nlh);
2950 if (args.iter.err && args.iter.err != -EMSGSIZE)
2951 return args.iter.err;
2952 if (args.iter.count == cb->args[0])
2955 cb->args[0] = args.iter.count;
2962 static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb,
2963 const struct nlmsghdr *nlh,
2964 const struct nlattr * const nla[])
2966 const struct nft_set *set;
2970 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
2974 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2976 return PTR_ERR(set);
2977 if (set->flags & NFT_SET_INACTIVE)
2980 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2981 struct netlink_dump_control c = {
2982 .dump = nf_tables_dump_set,
2984 return netlink_dump_start(nlsk, skb, nlh, &c);
2989 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
2990 const struct nft_ctx *ctx, u32 seq,
2991 u32 portid, int event, u16 flags,
2992 const struct nft_set *set,
2993 const struct nft_set_elem *elem)
2995 struct nfgenmsg *nfmsg;
2996 struct nlmsghdr *nlh;
2997 struct nlattr *nest;
3000 event |= NFNL_SUBSYS_NFTABLES << 8;
3001 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3004 goto nla_put_failure;
3006 nfmsg = nlmsg_data(nlh);
3007 nfmsg->nfgen_family = ctx->afi->family;
3008 nfmsg->version = NFNETLINK_V0;
3011 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3012 goto nla_put_failure;
3013 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3014 goto nla_put_failure;
3016 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3018 goto nla_put_failure;
3020 err = nf_tables_fill_setelem(skb, set, elem);
3022 goto nla_put_failure;
3024 nla_nest_end(skb, nest);
3026 return nlmsg_end(skb, nlh);
3029 nlmsg_trim(skb, nlh);
3033 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3034 const struct nft_set *set,
3035 const struct nft_set_elem *elem,
3036 int event, u16 flags)
3038 struct net *net = ctx->net;
3039 u32 portid = ctx->portid;
3040 struct sk_buff *skb;
3043 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3047 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3051 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3058 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3062 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3066 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3068 struct nft_set *set)
3070 struct nft_trans *trans;
3072 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3076 nft_trans_elem_set(trans) = set;
3080 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3081 const struct nlattr *attr)
3083 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3084 struct nft_data_desc d1, d2;
3085 struct nft_set_elem elem;
3086 struct nft_set_binding *binding;
3087 enum nft_registers dreg;
3088 struct nft_trans *trans;
3091 if (set->size && set->nelems == set->size)
3094 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3095 nft_set_elem_policy);
3099 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3103 if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
3104 elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
3105 if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END)
3109 if (set->flags & NFT_SET_MAP) {
3110 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3111 !(elem.flags & NFT_SET_ELEM_INTERVAL_END))
3113 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3114 elem.flags & NFT_SET_ELEM_INTERVAL_END)
3117 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3121 err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]);
3125 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3129 if (set->ops->get(set, &elem) == 0)
3132 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3133 err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]);
3138 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3141 dreg = nft_type_to_reg(set->dtype);
3142 list_for_each_entry(binding, &set->bindings, list) {
3143 struct nft_ctx bind_ctx = {
3145 .table = ctx->table,
3146 .chain = (struct nft_chain *)binding->chain,
3149 err = nft_validate_data_load(&bind_ctx, dreg,
3150 &elem.data, d2.type);
3156 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3160 err = set->ops->insert(set, &elem);
3164 nft_trans_elem(trans) = elem;
3165 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3171 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3172 nft_data_uninit(&elem.data, d2.type);
3174 nft_data_uninit(&elem.key, d1.type);
3179 static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb,
3180 const struct nlmsghdr *nlh,
3181 const struct nlattr * const nla[])
3183 struct net *net = sock_net(skb->sk);
3184 const struct nlattr *attr;
3185 struct nft_set *set;
3189 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3192 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, true);
3196 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3198 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3199 set = nf_tables_set_lookup_byid(net,
3200 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3203 return PTR_ERR(set);
3206 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3209 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3210 err = nft_add_set_elem(&ctx, set, attr);
3219 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3220 const struct nlattr *attr)
3222 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3223 struct nft_data_desc desc;
3224 struct nft_set_elem elem;
3225 struct nft_trans *trans;
3228 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3229 nft_set_elem_policy);
3234 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3237 err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]);
3242 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3245 err = set->ops->get(set, &elem);
3249 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3250 if (trans == NULL) {
3255 nft_trans_elem(trans) = elem;
3256 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3259 nft_data_uninit(&elem.key, desc.type);
3264 static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb,
3265 const struct nlmsghdr *nlh,
3266 const struct nlattr * const nla[])
3268 const struct nlattr *attr;
3269 struct nft_set *set;
3273 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3276 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
3280 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3282 return PTR_ERR(set);
3283 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3286 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3287 err = nft_del_setelem(&ctx, set, attr);
3296 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3297 [NFT_MSG_NEWTABLE] = {
3298 .call_batch = nf_tables_newtable,
3299 .attr_count = NFTA_TABLE_MAX,
3300 .policy = nft_table_policy,
3302 [NFT_MSG_GETTABLE] = {
3303 .call = nf_tables_gettable,
3304 .attr_count = NFTA_TABLE_MAX,
3305 .policy = nft_table_policy,
3307 [NFT_MSG_DELTABLE] = {
3308 .call_batch = nf_tables_deltable,
3309 .attr_count = NFTA_TABLE_MAX,
3310 .policy = nft_table_policy,
3312 [NFT_MSG_NEWCHAIN] = {
3313 .call_batch = nf_tables_newchain,
3314 .attr_count = NFTA_CHAIN_MAX,
3315 .policy = nft_chain_policy,
3317 [NFT_MSG_GETCHAIN] = {
3318 .call = nf_tables_getchain,
3319 .attr_count = NFTA_CHAIN_MAX,
3320 .policy = nft_chain_policy,
3322 [NFT_MSG_DELCHAIN] = {
3323 .call_batch = nf_tables_delchain,
3324 .attr_count = NFTA_CHAIN_MAX,
3325 .policy = nft_chain_policy,
3327 [NFT_MSG_NEWRULE] = {
3328 .call_batch = nf_tables_newrule,
3329 .attr_count = NFTA_RULE_MAX,
3330 .policy = nft_rule_policy,
3332 [NFT_MSG_GETRULE] = {
3333 .call = nf_tables_getrule,
3334 .attr_count = NFTA_RULE_MAX,
3335 .policy = nft_rule_policy,
3337 [NFT_MSG_DELRULE] = {
3338 .call_batch = nf_tables_delrule,
3339 .attr_count = NFTA_RULE_MAX,
3340 .policy = nft_rule_policy,
3342 [NFT_MSG_NEWSET] = {
3343 .call_batch = nf_tables_newset,
3344 .attr_count = NFTA_SET_MAX,
3345 .policy = nft_set_policy,
3347 [NFT_MSG_GETSET] = {
3348 .call = nf_tables_getset,
3349 .attr_count = NFTA_SET_MAX,
3350 .policy = nft_set_policy,
3352 [NFT_MSG_DELSET] = {
3353 .call_batch = nf_tables_delset,
3354 .attr_count = NFTA_SET_MAX,
3355 .policy = nft_set_policy,
3357 [NFT_MSG_NEWSETELEM] = {
3358 .call_batch = nf_tables_newsetelem,
3359 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3360 .policy = nft_set_elem_list_policy,
3362 [NFT_MSG_GETSETELEM] = {
3363 .call = nf_tables_getsetelem,
3364 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3365 .policy = nft_set_elem_list_policy,
3367 [NFT_MSG_DELSETELEM] = {
3368 .call_batch = nf_tables_delsetelem,
3369 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3370 .policy = nft_set_elem_list_policy,
3374 static void nft_chain_commit_update(struct nft_trans *trans)
3376 struct nft_base_chain *basechain;
3378 if (nft_trans_chain_name(trans)[0])
3379 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3381 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3384 basechain = nft_base_chain(trans->ctx.chain);
3385 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3387 switch (nft_trans_chain_policy(trans)) {
3390 basechain->policy = nft_trans_chain_policy(trans);
3395 /* Schedule objects for release via rcu to make sure no packets are accesing
3398 static void nf_tables_commit_release_rcu(struct rcu_head *rt)
3400 struct nft_trans *trans = container_of(rt, struct nft_trans, rcu_head);
3402 switch (trans->msg_type) {
3403 case NFT_MSG_DELTABLE:
3404 nf_tables_table_destroy(&trans->ctx);
3406 case NFT_MSG_DELCHAIN:
3407 nf_tables_chain_destroy(trans->ctx.chain);
3409 case NFT_MSG_DELRULE:
3410 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3412 case NFT_MSG_DELSET:
3413 nft_set_destroy(nft_trans_set(trans));
3419 static int nf_tables_commit(struct sk_buff *skb)
3421 struct net *net = sock_net(skb->sk);
3422 struct nft_trans *trans, *next;
3423 struct nft_trans_elem *te;
3425 /* Bump generation counter, invalidate any dump in progress */
3426 while (++net->nft.base_seq == 0);
3428 /* A new generation has just started */
3429 net->nft.gencursor = gencursor_next(net);
3431 /* Make sure all packets have left the previous generation before
3432 * purging old rules.
3436 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3437 switch (trans->msg_type) {
3438 case NFT_MSG_NEWTABLE:
3439 if (nft_trans_table_update(trans)) {
3440 if (!nft_trans_table_enable(trans)) {
3441 nf_tables_table_disable(trans->ctx.afi,
3443 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3446 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3448 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
3449 nft_trans_destroy(trans);
3451 case NFT_MSG_DELTABLE:
3452 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
3454 case NFT_MSG_NEWCHAIN:
3455 if (nft_trans_chain_update(trans))
3456 nft_chain_commit_update(trans);
3458 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
3460 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
3461 nft_trans_destroy(trans);
3463 case NFT_MSG_DELCHAIN:
3464 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
3465 nf_tables_unregister_hooks(trans->ctx.table,
3467 trans->ctx.afi->nops);
3469 case NFT_MSG_NEWRULE:
3470 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3471 nf_tables_rule_notify(&trans->ctx,
3472 nft_trans_rule(trans),
3474 nft_trans_destroy(trans);
3476 case NFT_MSG_DELRULE:
3477 list_del_rcu(&nft_trans_rule(trans)->list);
3478 nf_tables_rule_notify(&trans->ctx,
3479 nft_trans_rule(trans),
3482 case NFT_MSG_NEWSET:
3483 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
3484 /* This avoids hitting -EBUSY when deleting the table
3485 * from the transaction.
3487 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
3488 !list_empty(&nft_trans_set(trans)->bindings))
3489 trans->ctx.table->use--;
3491 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3492 NFT_MSG_NEWSET, GFP_KERNEL);
3493 nft_trans_destroy(trans);
3495 case NFT_MSG_DELSET:
3496 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3497 NFT_MSG_DELSET, GFP_KERNEL);
3499 case NFT_MSG_NEWSETELEM:
3500 nf_tables_setelem_notify(&trans->ctx,
3501 nft_trans_elem_set(trans),
3502 &nft_trans_elem(trans),
3503 NFT_MSG_NEWSETELEM, 0);
3504 nft_trans_destroy(trans);
3506 case NFT_MSG_DELSETELEM:
3507 te = (struct nft_trans_elem *)trans->data;
3508 nf_tables_setelem_notify(&trans->ctx, te->set,
3510 NFT_MSG_DELSETELEM, 0);
3511 te->set->ops->get(te->set, &te->elem);
3512 te->set->ops->remove(te->set, &te->elem);
3513 nft_data_uninit(&te->elem.key, NFT_DATA_VALUE);
3514 if (te->elem.flags & NFT_SET_MAP) {
3515 nft_data_uninit(&te->elem.data,
3518 nft_trans_destroy(trans);
3523 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3524 list_del(&trans->list);
3525 trans->ctx.nla = NULL;
3526 call_rcu(&trans->rcu_head, nf_tables_commit_release_rcu);
3532 /* Schedule objects for release via rcu to make sure no packets are accesing
3535 static void nf_tables_abort_release_rcu(struct rcu_head *rt)
3537 struct nft_trans *trans = container_of(rt, struct nft_trans, rcu_head);
3539 switch (trans->msg_type) {
3540 case NFT_MSG_NEWTABLE:
3541 nf_tables_table_destroy(&trans->ctx);
3543 case NFT_MSG_NEWCHAIN:
3544 nf_tables_chain_destroy(trans->ctx.chain);
3546 case NFT_MSG_NEWRULE:
3547 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3549 case NFT_MSG_NEWSET:
3550 nft_set_destroy(nft_trans_set(trans));
3556 static int nf_tables_abort(struct sk_buff *skb)
3558 struct net *net = sock_net(skb->sk);
3559 struct nft_trans *trans, *next;
3560 struct nft_set *set;
3562 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3563 switch (trans->msg_type) {
3564 case NFT_MSG_NEWTABLE:
3565 if (nft_trans_table_update(trans)) {
3566 if (nft_trans_table_enable(trans)) {
3567 nf_tables_table_disable(trans->ctx.afi,
3569 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3571 nft_trans_destroy(trans);
3573 list_del_rcu(&trans->ctx.table->list);
3576 case NFT_MSG_DELTABLE:
3577 list_add_tail_rcu(&trans->ctx.table->list,
3578 &trans->ctx.afi->tables);
3579 nft_trans_destroy(trans);
3581 case NFT_MSG_NEWCHAIN:
3582 if (nft_trans_chain_update(trans)) {
3583 if (nft_trans_chain_stats(trans))
3584 free_percpu(nft_trans_chain_stats(trans));
3586 nft_trans_destroy(trans);
3588 trans->ctx.table->use--;
3589 list_del_rcu(&trans->ctx.chain->list);
3590 nf_tables_unregister_hooks(trans->ctx.table,
3592 trans->ctx.afi->nops);
3595 case NFT_MSG_DELCHAIN:
3596 trans->ctx.table->use++;
3597 list_add_tail_rcu(&trans->ctx.chain->list,
3598 &trans->ctx.table->chains);
3599 nft_trans_destroy(trans);
3601 case NFT_MSG_NEWRULE:
3602 trans->ctx.chain->use--;
3603 list_del_rcu(&nft_trans_rule(trans)->list);
3605 case NFT_MSG_DELRULE:
3606 trans->ctx.chain->use++;
3607 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3608 nft_trans_destroy(trans);
3610 case NFT_MSG_NEWSET:
3611 trans->ctx.table->use--;
3612 list_del_rcu(&nft_trans_set(trans)->list);
3614 case NFT_MSG_DELSET:
3615 trans->ctx.table->use++;
3616 list_add_tail_rcu(&nft_trans_set(trans)->list,
3617 &trans->ctx.table->sets);
3618 nft_trans_destroy(trans);
3620 case NFT_MSG_NEWSETELEM:
3621 nft_trans_elem_set(trans)->nelems--;
3622 set = nft_trans_elem_set(trans);
3623 set->ops->get(set, &nft_trans_elem(trans));
3624 set->ops->remove(set, &nft_trans_elem(trans));
3625 nft_trans_destroy(trans);
3627 case NFT_MSG_DELSETELEM:
3628 nft_trans_elem_set(trans)->nelems++;
3629 nft_trans_destroy(trans);
3634 list_for_each_entry_safe_reverse(trans, next,
3635 &net->nft.commit_list, list) {
3636 list_del(&trans->list);
3637 trans->ctx.nla = NULL;
3638 call_rcu(&trans->rcu_head, nf_tables_abort_release_rcu);
3644 static const struct nfnetlink_subsystem nf_tables_subsys = {
3645 .name = "nf_tables",
3646 .subsys_id = NFNL_SUBSYS_NFTABLES,
3647 .cb_count = NFT_MSG_MAX,
3649 .commit = nf_tables_commit,
3650 .abort = nf_tables_abort,
3654 * Loop detection - walk through the ruleset beginning at the destination chain
3655 * of a new jump until either the source chain is reached (loop) or all
3656 * reachable chains have been traversed.
3658 * The loop check is performed whenever a new jump verdict is added to an
3659 * expression or verdict map or a verdict map is bound to a new chain.
3662 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3663 const struct nft_chain *chain);
3665 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
3666 const struct nft_set *set,
3667 const struct nft_set_iter *iter,
3668 const struct nft_set_elem *elem)
3670 if (elem->flags & NFT_SET_ELEM_INTERVAL_END)
3673 switch (elem->data.verdict) {
3676 return nf_tables_check_loops(ctx, elem->data.chain);
3682 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3683 const struct nft_chain *chain)
3685 const struct nft_rule *rule;
3686 const struct nft_expr *expr, *last;
3687 const struct nft_set *set;
3688 struct nft_set_binding *binding;
3689 struct nft_set_iter iter;
3691 if (ctx->chain == chain)
3694 list_for_each_entry(rule, &chain->rules, list) {
3695 nft_rule_for_each_expr(expr, last, rule) {
3696 const struct nft_data *data = NULL;
3699 if (!expr->ops->validate)
3702 err = expr->ops->validate(ctx, expr, &data);
3709 switch (data->verdict) {
3712 err = nf_tables_check_loops(ctx, data->chain);
3721 list_for_each_entry(set, &ctx->table->sets, list) {
3722 if (!(set->flags & NFT_SET_MAP) ||
3723 set->dtype != NFT_DATA_VERDICT)
3726 list_for_each_entry(binding, &set->bindings, list) {
3727 if (binding->chain != chain)
3733 iter.fn = nf_tables_loop_check_setelem;
3735 set->ops->walk(ctx, set, &iter);
3745 * nft_validate_input_register - validate an expressions' input register
3747 * @reg: the register number
3749 * Validate that the input register is one of the general purpose
3752 int nft_validate_input_register(enum nft_registers reg)
3754 if (reg <= NFT_REG_VERDICT)
3756 if (reg > NFT_REG_MAX)
3760 EXPORT_SYMBOL_GPL(nft_validate_input_register);
3763 * nft_validate_output_register - validate an expressions' output register
3765 * @reg: the register number
3767 * Validate that the output register is one of the general purpose
3768 * registers or the verdict register.
3770 int nft_validate_output_register(enum nft_registers reg)
3772 if (reg < NFT_REG_VERDICT)
3774 if (reg > NFT_REG_MAX)
3778 EXPORT_SYMBOL_GPL(nft_validate_output_register);
3781 * nft_validate_data_load - validate an expressions' data load
3783 * @ctx: context of the expression performing the load
3784 * @reg: the destination register number
3785 * @data: the data to load
3786 * @type: the data type
3788 * Validate that a data load uses the appropriate data type for
3789 * the destination register. A value of NULL for the data means
3790 * that its runtime gathered data, which is always of type
3793 int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg,
3794 const struct nft_data *data,
3795 enum nft_data_types type)
3800 case NFT_REG_VERDICT:
3801 if (data == NULL || type != NFT_DATA_VERDICT)
3804 if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) {
3805 err = nf_tables_check_loops(ctx, data->chain);
3809 if (ctx->chain->level + 1 > data->chain->level) {
3810 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
3812 data->chain->level = ctx->chain->level + 1;
3818 if (data != NULL && type != NFT_DATA_VALUE)
3823 EXPORT_SYMBOL_GPL(nft_validate_data_load);
3825 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
3826 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
3827 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
3828 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3831 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
3832 struct nft_data_desc *desc, const struct nlattr *nla)
3834 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
3835 struct nft_chain *chain;
3838 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
3842 if (!tb[NFTA_VERDICT_CODE])
3844 data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
3846 switch (data->verdict) {
3848 switch (data->verdict & NF_VERDICT_MASK) {
3860 desc->len = sizeof(data->verdict);
3864 if (!tb[NFTA_VERDICT_CHAIN])
3866 chain = nf_tables_chain_lookup(ctx->table,
3867 tb[NFTA_VERDICT_CHAIN]);
3869 return PTR_ERR(chain);
3870 if (chain->flags & NFT_BASE_CHAIN)
3874 data->chain = chain;
3875 desc->len = sizeof(data);
3879 desc->type = NFT_DATA_VERDICT;
3883 static void nft_verdict_uninit(const struct nft_data *data)
3885 switch (data->verdict) {
3893 static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data)
3895 struct nlattr *nest;
3897 nest = nla_nest_start(skb, NFTA_DATA_VERDICT);
3899 goto nla_put_failure;
3901 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict)))
3902 goto nla_put_failure;
3904 switch (data->verdict) {
3907 if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name))
3908 goto nla_put_failure;
3910 nla_nest_end(skb, nest);
3917 static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data,
3918 struct nft_data_desc *desc, const struct nlattr *nla)
3925 if (len > sizeof(data->data))
3928 nla_memcpy(data->data, nla, sizeof(data->data));
3929 desc->type = NFT_DATA_VALUE;
3934 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
3937 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
3940 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
3941 [NFTA_DATA_VALUE] = { .type = NLA_BINARY,
3942 .len = FIELD_SIZEOF(struct nft_data, data) },
3943 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
3947 * nft_data_init - parse nf_tables data netlink attributes
3949 * @ctx: context of the expression using the data
3950 * @data: destination struct nft_data
3951 * @desc: data description
3952 * @nla: netlink attribute containing data
3954 * Parse the netlink data attributes and initialize a struct nft_data.
3955 * The type and length of data are returned in the data description.
3957 * The caller can indicate that it only wants to accept data of type
3958 * NFT_DATA_VALUE by passing NULL for the ctx argument.
3960 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
3961 struct nft_data_desc *desc, const struct nlattr *nla)
3963 struct nlattr *tb[NFTA_DATA_MAX + 1];
3966 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
3970 if (tb[NFTA_DATA_VALUE])
3971 return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
3972 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
3973 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
3976 EXPORT_SYMBOL_GPL(nft_data_init);
3979 * nft_data_uninit - release a nft_data item
3981 * @data: struct nft_data to release
3982 * @type: type of data
3984 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
3985 * all others need to be released by calling this function.
3987 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
3990 case NFT_DATA_VALUE:
3992 case NFT_DATA_VERDICT:
3993 return nft_verdict_uninit(data);
3998 EXPORT_SYMBOL_GPL(nft_data_uninit);
4000 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4001 enum nft_data_types type, unsigned int len)
4003 struct nlattr *nest;
4006 nest = nla_nest_start(skb, attr);
4011 case NFT_DATA_VALUE:
4012 err = nft_value_dump(skb, data, len);
4014 case NFT_DATA_VERDICT:
4015 err = nft_verdict_dump(skb, data);
4022 nla_nest_end(skb, nest);
4025 EXPORT_SYMBOL_GPL(nft_data_dump);
4027 static int nf_tables_init_net(struct net *net)
4029 INIT_LIST_HEAD(&net->nft.af_info);
4030 INIT_LIST_HEAD(&net->nft.commit_list);
4031 net->nft.base_seq = 1;
4035 static struct pernet_operations nf_tables_net_ops = {
4036 .init = nf_tables_init_net,
4039 static int __init nf_tables_module_init(void)
4043 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4050 err = nf_tables_core_module_init();
4054 err = nfnetlink_subsys_register(&nf_tables_subsys);
4058 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4059 return register_pernet_subsys(&nf_tables_net_ops);
4061 nf_tables_core_module_exit();
4068 static void __exit nf_tables_module_exit(void)
4070 unregister_pernet_subsys(&nf_tables_net_ops);
4071 nfnetlink_subsys_unregister(&nf_tables_subsys);
4072 nf_tables_core_module_exit();
4076 module_init(nf_tables_module_init);
4077 module_exit(nf_tables_module_exit);
4079 MODULE_LICENSE("GPL");
4080 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4081 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);