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);
44 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi);
47 * nft_unregister_afinfo - unregister nf_tables address family info
49 * @afi: address family info to unregister
51 * Unregister the address family for use with nf_tables.
53 void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi)
55 nfnl_lock(NFNL_SUBSYS_NFTABLES);
56 __nft_release_afinfo(net, afi);
57 list_del_rcu(&afi->list);
58 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
60 EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
62 static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
64 struct nft_af_info *afi;
66 list_for_each_entry(afi, &net->nft.af_info, list) {
67 if (afi->family == family)
73 static struct nft_af_info *
74 nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
76 struct nft_af_info *afi;
78 afi = nft_afinfo_lookup(net, family);
83 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
84 request_module("nft-afinfo-%u", family);
85 nfnl_lock(NFNL_SUBSYS_NFTABLES);
86 afi = nft_afinfo_lookup(net, family);
88 return ERR_PTR(-EAGAIN);
91 return ERR_PTR(-EAFNOSUPPORT);
94 static void nft_ctx_init(struct nft_ctx *ctx,
96 const struct sk_buff *skb,
97 const struct nlmsghdr *nlh,
98 struct nft_af_info *afi,
99 struct nft_table *table,
100 struct nft_chain *chain,
101 const struct nlattr * const *nla)
108 ctx->portid = NETLINK_CB(skb).portid;
109 ctx->report = nlmsg_report(nlh);
110 ctx->seq = nlh->nlmsg_seq;
113 static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type,
116 struct nft_trans *trans;
118 trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL);
122 trans->msg_type = msg_type;
128 static void nft_trans_destroy(struct nft_trans *trans)
130 list_del(&trans->list);
134 static int nf_tables_register_hooks(struct net *net,
135 const struct nft_table *table,
136 struct nft_chain *chain,
137 unsigned int hook_nops)
139 if (table->flags & NFT_TABLE_F_DORMANT ||
140 !(chain->flags & NFT_BASE_CHAIN))
143 return nf_register_net_hooks(net, nft_base_chain(chain)->ops,
147 static void nf_tables_unregister_hooks(struct net *net,
148 const struct nft_table *table,
149 struct nft_chain *chain,
150 unsigned int hook_nops)
152 if (table->flags & NFT_TABLE_F_DORMANT ||
153 !(chain->flags & NFT_BASE_CHAIN))
156 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops, hook_nops);
159 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
161 struct nft_trans *trans;
163 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
167 if (msg_type == NFT_MSG_NEWTABLE)
168 nft_activate_next(ctx->net, ctx->table);
170 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
174 static int nft_deltable(struct nft_ctx *ctx)
178 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
182 nft_deactivate_next(ctx->net, ctx->table);
186 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
188 struct nft_trans *trans;
190 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
194 if (msg_type == NFT_MSG_NEWCHAIN)
195 nft_activate_next(ctx->net, ctx->chain);
197 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
201 static int nft_delchain(struct nft_ctx *ctx)
205 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
210 nft_deactivate_next(ctx->net, ctx->chain);
216 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
218 /* You cannot delete the same rule twice */
219 if (nft_is_active_next(ctx->net, rule)) {
220 nft_deactivate_next(ctx->net, rule);
227 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
228 struct nft_rule *rule)
230 struct nft_trans *trans;
232 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
236 nft_trans_rule(trans) = rule;
237 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
242 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
244 struct nft_trans *trans;
247 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
251 err = nf_tables_delrule_deactivate(ctx, rule);
253 nft_trans_destroy(trans);
260 static int nft_delrule_by_chain(struct nft_ctx *ctx)
262 struct nft_rule *rule;
265 list_for_each_entry(rule, &ctx->chain->rules, list) {
266 err = nft_delrule(ctx, rule);
273 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
276 struct nft_trans *trans;
278 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
282 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
283 nft_trans_set_id(trans) =
284 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
285 nft_activate_next(ctx->net, set);
287 nft_trans_set(trans) = set;
288 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
293 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
297 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
301 nft_deactivate_next(ctx->net, set);
311 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
312 const struct nlattr *nla,
315 struct nft_table *table;
317 list_for_each_entry(table, &afi->tables, list) {
318 if (!nla_strcmp(nla, table->name) &&
319 nft_active_genmask(table, genmask))
325 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
326 const struct nlattr *nla,
329 struct nft_table *table;
332 return ERR_PTR(-EINVAL);
334 table = nft_table_lookup(afi, nla, genmask);
338 return ERR_PTR(-ENOENT);
341 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
343 return ++table->hgenerator;
346 static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
348 static const struct nf_chain_type *
349 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
353 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
354 if (chain_type[family][i] != NULL &&
355 !nla_strcmp(nla, chain_type[family][i]->name))
356 return chain_type[family][i];
361 static const struct nf_chain_type *
362 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
363 const struct nlattr *nla,
366 const struct nf_chain_type *type;
368 type = __nf_tables_chain_type_lookup(afi->family, nla);
371 #ifdef CONFIG_MODULES
373 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
374 request_module("nft-chain-%u-%.*s", afi->family,
375 nla_len(nla), (const char *)nla_data(nla));
376 nfnl_lock(NFNL_SUBSYS_NFTABLES);
377 type = __nf_tables_chain_type_lookup(afi->family, nla);
379 return ERR_PTR(-EAGAIN);
382 return ERR_PTR(-ENOENT);
385 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
386 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
387 .len = NFT_TABLE_MAXNAMELEN - 1 },
388 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
391 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
392 u32 portid, u32 seq, int event, u32 flags,
393 int family, const struct nft_table *table)
395 struct nlmsghdr *nlh;
396 struct nfgenmsg *nfmsg;
398 event |= NFNL_SUBSYS_NFTABLES << 8;
399 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
401 goto nla_put_failure;
403 nfmsg = nlmsg_data(nlh);
404 nfmsg->nfgen_family = family;
405 nfmsg->version = NFNETLINK_V0;
406 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
408 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
409 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
410 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
411 goto nla_put_failure;
417 nlmsg_trim(skb, nlh);
421 static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
427 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
431 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
435 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
436 event, 0, ctx->afi->family, ctx->table);
442 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
443 ctx->report, GFP_KERNEL);
446 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
452 static int nf_tables_dump_tables(struct sk_buff *skb,
453 struct netlink_callback *cb)
455 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
456 const struct nft_af_info *afi;
457 const struct nft_table *table;
458 unsigned int idx = 0, s_idx = cb->args[0];
459 struct net *net = sock_net(skb->sk);
460 int family = nfmsg->nfgen_family;
463 cb->seq = net->nft.base_seq;
465 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
466 if (family != NFPROTO_UNSPEC && family != afi->family)
469 list_for_each_entry_rcu(table, &afi->tables, list) {
473 memset(&cb->args[1], 0,
474 sizeof(cb->args) - sizeof(cb->args[0]));
475 if (!nft_is_active(net, table))
477 if (nf_tables_fill_table_info(skb, net,
478 NETLINK_CB(cb->skb).portid,
482 afi->family, table) < 0)
485 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
496 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
497 struct sk_buff *skb, const struct nlmsghdr *nlh,
498 const struct nlattr * const nla[])
500 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
501 u8 genmask = nft_genmask_cur(net);
502 const struct nft_af_info *afi;
503 const struct nft_table *table;
504 struct sk_buff *skb2;
505 int family = nfmsg->nfgen_family;
508 if (nlh->nlmsg_flags & NLM_F_DUMP) {
509 struct netlink_dump_control c = {
510 .dump = nf_tables_dump_tables,
512 return netlink_dump_start(nlsk, skb, nlh, &c);
515 afi = nf_tables_afinfo_lookup(net, family, false);
519 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
521 return PTR_ERR(table);
523 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
527 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
528 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
533 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
540 static int nf_tables_table_enable(struct net *net,
541 const struct nft_af_info *afi,
542 struct nft_table *table)
544 struct nft_chain *chain;
547 list_for_each_entry(chain, &table->chains, list) {
548 if (!nft_is_active_next(net, chain))
550 if (!(chain->flags & NFT_BASE_CHAIN))
553 err = nf_register_net_hooks(net, nft_base_chain(chain)->ops,
562 list_for_each_entry(chain, &table->chains, list) {
563 if (!nft_is_active_next(net, chain))
565 if (!(chain->flags & NFT_BASE_CHAIN))
571 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
577 static void nf_tables_table_disable(struct net *net,
578 const struct nft_af_info *afi,
579 struct nft_table *table)
581 struct nft_chain *chain;
583 list_for_each_entry(chain, &table->chains, list) {
584 if (!nft_is_active_next(net, chain))
586 if (!(chain->flags & NFT_BASE_CHAIN))
589 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
594 static int nf_tables_updtable(struct nft_ctx *ctx)
596 struct nft_trans *trans;
600 if (!ctx->nla[NFTA_TABLE_FLAGS])
603 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
604 if (flags & ~NFT_TABLE_F_DORMANT)
607 if (flags == ctx->table->flags)
610 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
611 sizeof(struct nft_trans_table));
615 if ((flags & NFT_TABLE_F_DORMANT) &&
616 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
617 nft_trans_table_enable(trans) = false;
618 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
619 ctx->table->flags & NFT_TABLE_F_DORMANT) {
620 ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table);
622 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
623 nft_trans_table_enable(trans) = true;
629 nft_trans_table_update(trans) = true;
630 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
633 nft_trans_destroy(trans);
637 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
638 struct sk_buff *skb, const struct nlmsghdr *nlh,
639 const struct nlattr * const nla[])
641 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
642 u8 genmask = nft_genmask_next(net);
643 const struct nlattr *name;
644 struct nft_af_info *afi;
645 struct nft_table *table;
646 int family = nfmsg->nfgen_family;
651 afi = nf_tables_afinfo_lookup(net, family, true);
655 name = nla[NFTA_TABLE_NAME];
656 table = nf_tables_table_lookup(afi, name, genmask);
658 if (PTR_ERR(table) != -ENOENT)
659 return PTR_ERR(table);
664 if (nlh->nlmsg_flags & NLM_F_EXCL)
666 if (nlh->nlmsg_flags & NLM_F_REPLACE)
669 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
670 return nf_tables_updtable(&ctx);
673 if (nla[NFTA_TABLE_FLAGS]) {
674 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
675 if (flags & ~NFT_TABLE_F_DORMANT)
680 if (!try_module_get(afi->owner))
684 table = kzalloc(sizeof(*table), GFP_KERNEL);
688 nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
689 INIT_LIST_HEAD(&table->chains);
690 INIT_LIST_HEAD(&table->sets);
691 table->flags = flags;
693 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
694 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
698 list_add_tail_rcu(&table->list, &afi->tables);
703 module_put(afi->owner);
708 static int nft_flush_table(struct nft_ctx *ctx)
711 struct nft_chain *chain, *nc;
712 struct nft_set *set, *ns;
714 list_for_each_entry(chain, &ctx->table->chains, list) {
715 if (!nft_is_active_next(ctx->net, chain))
720 err = nft_delrule_by_chain(ctx);
725 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
726 if (!nft_is_active_next(ctx->net, set))
729 if (set->flags & NFT_SET_ANONYMOUS &&
730 !list_empty(&set->bindings))
733 err = nft_delset(ctx, set);
738 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
739 if (!nft_is_active_next(ctx->net, chain))
744 err = nft_delchain(ctx);
749 err = nft_deltable(ctx);
754 static int nft_flush(struct nft_ctx *ctx, int family)
756 struct nft_af_info *afi;
757 struct nft_table *table, *nt;
758 const struct nlattr * const *nla = ctx->nla;
761 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
762 if (family != AF_UNSPEC && afi->family != family)
766 list_for_each_entry_safe(table, nt, &afi->tables, list) {
767 if (!nft_is_active_next(ctx->net, table))
770 if (nla[NFTA_TABLE_NAME] &&
771 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
776 err = nft_flush_table(ctx);
785 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
786 struct sk_buff *skb, const struct nlmsghdr *nlh,
787 const struct nlattr * const nla[])
789 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
790 u8 genmask = nft_genmask_next(net);
791 struct nft_af_info *afi;
792 struct nft_table *table;
793 int family = nfmsg->nfgen_family;
796 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
797 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
798 return nft_flush(&ctx, family);
800 afi = nf_tables_afinfo_lookup(net, family, false);
804 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
806 return PTR_ERR(table);
811 return nft_flush_table(&ctx);
814 static void nf_tables_table_destroy(struct nft_ctx *ctx)
816 BUG_ON(ctx->table->use > 0);
819 module_put(ctx->afi->owner);
822 int nft_register_chain_type(const struct nf_chain_type *ctype)
826 nfnl_lock(NFNL_SUBSYS_NFTABLES);
827 if (chain_type[ctype->family][ctype->type] != NULL) {
831 chain_type[ctype->family][ctype->type] = ctype;
833 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
836 EXPORT_SYMBOL_GPL(nft_register_chain_type);
838 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
840 nfnl_lock(NFNL_SUBSYS_NFTABLES);
841 chain_type[ctype->family][ctype->type] = NULL;
842 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
844 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
850 static struct nft_chain *
851 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle,
854 struct nft_chain *chain;
856 list_for_each_entry(chain, &table->chains, list) {
857 if (chain->handle == handle &&
858 nft_active_genmask(chain, genmask))
862 return ERR_PTR(-ENOENT);
865 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
866 const struct nlattr *nla,
869 struct nft_chain *chain;
872 return ERR_PTR(-EINVAL);
874 list_for_each_entry(chain, &table->chains, list) {
875 if (!nla_strcmp(nla, chain->name) &&
876 nft_active_genmask(chain, genmask))
880 return ERR_PTR(-ENOENT);
883 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
884 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
885 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
886 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
887 .len = NFT_CHAIN_MAXNAMELEN - 1 },
888 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
889 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
890 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
891 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
894 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
895 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
896 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
897 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
898 .len = IFNAMSIZ - 1 },
901 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
903 struct nft_stats *cpu_stats, total;
909 memset(&total, 0, sizeof(total));
910 for_each_possible_cpu(cpu) {
911 cpu_stats = per_cpu_ptr(stats, cpu);
913 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
914 pkts = cpu_stats->pkts;
915 bytes = cpu_stats->bytes;
916 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
918 total.bytes += bytes;
920 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
922 goto nla_put_failure;
924 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
926 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
928 goto nla_put_failure;
930 nla_nest_end(skb, nest);
937 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
938 u32 portid, u32 seq, int event, u32 flags,
939 int family, const struct nft_table *table,
940 const struct nft_chain *chain)
942 struct nlmsghdr *nlh;
943 struct nfgenmsg *nfmsg;
945 event |= NFNL_SUBSYS_NFTABLES << 8;
946 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
948 goto nla_put_failure;
950 nfmsg = nlmsg_data(nlh);
951 nfmsg->nfgen_family = family;
952 nfmsg->version = NFNETLINK_V0;
953 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
955 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
956 goto nla_put_failure;
957 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
959 goto nla_put_failure;
960 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
961 goto nla_put_failure;
963 if (chain->flags & NFT_BASE_CHAIN) {
964 const struct nft_base_chain *basechain = nft_base_chain(chain);
965 const struct nf_hook_ops *ops = &basechain->ops[0];
968 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
970 goto nla_put_failure;
971 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
972 goto nla_put_failure;
973 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
974 goto nla_put_failure;
975 if (basechain->dev_name[0] &&
976 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
977 goto nla_put_failure;
978 nla_nest_end(skb, nest);
980 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
981 htonl(basechain->policy)))
982 goto nla_put_failure;
984 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
985 goto nla_put_failure;
987 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
988 goto nla_put_failure;
991 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
992 goto nla_put_failure;
998 nlmsg_trim(skb, nlh);
1002 static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1004 struct sk_buff *skb;
1008 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1012 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1016 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1017 event, 0, ctx->afi->family, ctx->table,
1024 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1025 ctx->report, GFP_KERNEL);
1028 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1034 static int nf_tables_dump_chains(struct sk_buff *skb,
1035 struct netlink_callback *cb)
1037 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1038 const struct nft_af_info *afi;
1039 const struct nft_table *table;
1040 const struct nft_chain *chain;
1041 unsigned int idx = 0, s_idx = cb->args[0];
1042 struct net *net = sock_net(skb->sk);
1043 int family = nfmsg->nfgen_family;
1046 cb->seq = net->nft.base_seq;
1048 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1049 if (family != NFPROTO_UNSPEC && family != afi->family)
1052 list_for_each_entry_rcu(table, &afi->tables, list) {
1053 list_for_each_entry_rcu(chain, &table->chains, list) {
1057 memset(&cb->args[1], 0,
1058 sizeof(cb->args) - sizeof(cb->args[0]));
1059 if (!nft_is_active(net, chain))
1061 if (nf_tables_fill_chain_info(skb, net,
1062 NETLINK_CB(cb->skb).portid,
1066 afi->family, table, chain) < 0)
1069 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1081 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1082 struct sk_buff *skb, const struct nlmsghdr *nlh,
1083 const struct nlattr * const nla[])
1085 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1086 u8 genmask = nft_genmask_cur(net);
1087 const struct nft_af_info *afi;
1088 const struct nft_table *table;
1089 const struct nft_chain *chain;
1090 struct sk_buff *skb2;
1091 int family = nfmsg->nfgen_family;
1094 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1095 struct netlink_dump_control c = {
1096 .dump = nf_tables_dump_chains,
1098 return netlink_dump_start(nlsk, skb, nlh, &c);
1101 afi = nf_tables_afinfo_lookup(net, family, false);
1103 return PTR_ERR(afi);
1105 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1107 return PTR_ERR(table);
1109 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1111 return PTR_ERR(chain);
1113 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1117 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1118 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1119 family, table, chain);
1123 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1130 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1131 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1132 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1135 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1137 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1138 struct nft_stats __percpu *newstats;
1139 struct nft_stats *stats;
1142 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1144 return ERR_PTR(err);
1146 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1147 return ERR_PTR(-EINVAL);
1149 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1150 if (newstats == NULL)
1151 return ERR_PTR(-ENOMEM);
1153 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1154 * are not exposed to userspace.
1157 stats = this_cpu_ptr(newstats);
1158 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1159 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1165 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1166 struct nft_stats __percpu *newstats)
1168 if (newstats == NULL)
1172 struct nft_stats __percpu *oldstats =
1173 nft_dereference(chain->stats);
1175 rcu_assign_pointer(chain->stats, newstats);
1177 free_percpu(oldstats);
1179 rcu_assign_pointer(chain->stats, newstats);
1182 static void nf_tables_chain_destroy(struct nft_chain *chain)
1184 BUG_ON(chain->use > 0);
1186 if (chain->flags & NFT_BASE_CHAIN) {
1187 struct nft_base_chain *basechain = nft_base_chain(chain);
1189 module_put(basechain->type->owner);
1190 free_percpu(basechain->stats);
1191 if (basechain->ops[0].dev != NULL)
1192 dev_put(basechain->ops[0].dev);
1199 struct nft_chain_hook {
1202 const struct nf_chain_type *type;
1203 struct net_device *dev;
1206 static int nft_chain_parse_hook(struct net *net,
1207 const struct nlattr * const nla[],
1208 struct nft_af_info *afi,
1209 struct nft_chain_hook *hook, bool create)
1211 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1212 const struct nf_chain_type *type;
1213 struct net_device *dev;
1216 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1221 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1222 ha[NFTA_HOOK_PRIORITY] == NULL)
1225 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1226 if (hook->num >= afi->nhooks)
1229 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1231 type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT];
1232 if (nla[NFTA_CHAIN_TYPE]) {
1233 type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE],
1236 return PTR_ERR(type);
1238 if (!(type->hook_mask & (1 << hook->num)))
1240 if (!try_module_get(type->owner))
1246 if (afi->flags & NFT_AF_NEEDS_DEV) {
1247 char ifname[IFNAMSIZ];
1249 if (!ha[NFTA_HOOK_DEV]) {
1250 module_put(type->owner);
1254 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1255 dev = dev_get_by_name(net, ifname);
1257 module_put(type->owner);
1261 } else if (ha[NFTA_HOOK_DEV]) {
1262 module_put(type->owner);
1269 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1271 module_put(hook->type->owner);
1272 if (hook->dev != NULL)
1276 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1277 struct sk_buff *skb, const struct nlmsghdr *nlh,
1278 const struct nlattr * const nla[])
1280 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1281 const struct nlattr * uninitialized_var(name);
1282 struct nft_af_info *afi;
1283 struct nft_table *table;
1284 struct nft_chain *chain;
1285 struct nft_base_chain *basechain = NULL;
1286 u8 genmask = nft_genmask_next(net);
1287 int family = nfmsg->nfgen_family;
1288 u8 policy = NF_ACCEPT;
1291 struct nft_stats __percpu *stats;
1296 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1298 afi = nf_tables_afinfo_lookup(net, family, true);
1300 return PTR_ERR(afi);
1302 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1304 return PTR_ERR(table);
1307 name = nla[NFTA_CHAIN_NAME];
1309 if (nla[NFTA_CHAIN_HANDLE]) {
1310 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1311 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
1313 return PTR_ERR(chain);
1315 chain = nf_tables_chain_lookup(table, name, genmask);
1316 if (IS_ERR(chain)) {
1317 if (PTR_ERR(chain) != -ENOENT)
1318 return PTR_ERR(chain);
1323 if (nla[NFTA_CHAIN_POLICY]) {
1324 if ((chain != NULL &&
1325 !(chain->flags & NFT_BASE_CHAIN)))
1328 if (chain == NULL &&
1329 nla[NFTA_CHAIN_HOOK] == NULL)
1332 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1342 if (chain != NULL) {
1343 struct nft_stats *stats = NULL;
1344 struct nft_trans *trans;
1346 if (nlh->nlmsg_flags & NLM_F_EXCL)
1348 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1351 if (nla[NFTA_CHAIN_HOOK]) {
1352 struct nft_base_chain *basechain;
1353 struct nft_chain_hook hook;
1354 struct nf_hook_ops *ops;
1356 if (!(chain->flags & NFT_BASE_CHAIN))
1359 err = nft_chain_parse_hook(net, nla, afi, &hook,
1364 basechain = nft_base_chain(chain);
1365 if (basechain->type != hook.type) {
1366 nft_chain_release_hook(&hook);
1370 for (i = 0; i < afi->nops; i++) {
1371 ops = &basechain->ops[i];
1372 if (ops->hooknum != hook.num ||
1373 ops->priority != hook.priority ||
1374 ops->dev != hook.dev) {
1375 nft_chain_release_hook(&hook);
1379 nft_chain_release_hook(&hook);
1382 if (nla[NFTA_CHAIN_HANDLE] && name) {
1383 struct nft_chain *chain2;
1385 chain2 = nf_tables_chain_lookup(table,
1386 nla[NFTA_CHAIN_NAME],
1389 return PTR_ERR(chain2);
1392 if (nla[NFTA_CHAIN_COUNTERS]) {
1393 if (!(chain->flags & NFT_BASE_CHAIN))
1396 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1398 return PTR_ERR(stats);
1401 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1402 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1403 sizeof(struct nft_trans_chain));
1404 if (trans == NULL) {
1409 nft_trans_chain_stats(trans) = stats;
1410 nft_trans_chain_update(trans) = true;
1412 if (nla[NFTA_CHAIN_POLICY])
1413 nft_trans_chain_policy(trans) = policy;
1415 nft_trans_chain_policy(trans) = -1;
1417 if (nla[NFTA_CHAIN_HANDLE] && name) {
1418 nla_strlcpy(nft_trans_chain_name(trans), name,
1419 NFT_CHAIN_MAXNAMELEN);
1421 list_add_tail(&trans->list, &net->nft.commit_list);
1425 if (table->use == UINT_MAX)
1428 if (nla[NFTA_CHAIN_HOOK]) {
1429 struct nft_chain_hook hook;
1430 struct nf_hook_ops *ops;
1433 err = nft_chain_parse_hook(net, nla, afi, &hook, create);
1437 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1438 if (basechain == NULL) {
1439 nft_chain_release_hook(&hook);
1443 if (hook.dev != NULL)
1444 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1446 if (nla[NFTA_CHAIN_COUNTERS]) {
1447 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1448 if (IS_ERR(stats)) {
1449 nft_chain_release_hook(&hook);
1451 return PTR_ERR(stats);
1453 basechain->stats = stats;
1455 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1456 if (stats == NULL) {
1457 nft_chain_release_hook(&hook);
1461 rcu_assign_pointer(basechain->stats, stats);
1464 hookfn = hook.type->hooks[hook.num];
1465 basechain->type = hook.type;
1466 chain = &basechain->chain;
1468 for (i = 0; i < afi->nops; i++) {
1469 ops = &basechain->ops[i];
1471 ops->hooknum = hook.num;
1472 ops->priority = hook.priority;
1474 ops->hook = afi->hooks[ops->hooknum];
1475 ops->dev = hook.dev;
1478 if (afi->hook_ops_init)
1479 afi->hook_ops_init(ops, i);
1482 chain->flags |= NFT_BASE_CHAIN;
1483 basechain->policy = policy;
1485 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1490 INIT_LIST_HEAD(&chain->rules);
1491 chain->handle = nf_tables_alloc_handle(table);
1492 chain->table = table;
1493 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1495 err = nf_tables_register_hooks(net, table, chain, afi->nops);
1499 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1500 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1505 list_add_tail_rcu(&chain->list, &table->chains);
1508 nf_tables_unregister_hooks(net, table, chain, afi->nops);
1510 nf_tables_chain_destroy(chain);
1514 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1515 struct sk_buff *skb, const struct nlmsghdr *nlh,
1516 const struct nlattr * const nla[])
1518 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1519 u8 genmask = nft_genmask_next(net);
1520 struct nft_af_info *afi;
1521 struct nft_table *table;
1522 struct nft_chain *chain;
1523 int family = nfmsg->nfgen_family;
1526 afi = nf_tables_afinfo_lookup(net, family, false);
1528 return PTR_ERR(afi);
1530 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1532 return PTR_ERR(table);
1534 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1536 return PTR_ERR(chain);
1540 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1542 return nft_delchain(&ctx);
1550 * nft_register_expr - register nf_tables expr type
1553 * Registers the expr type for use with nf_tables. Returns zero on
1554 * success or a negative errno code otherwise.
1556 int nft_register_expr(struct nft_expr_type *type)
1558 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1559 if (type->family == NFPROTO_UNSPEC)
1560 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1562 list_add_rcu(&type->list, &nf_tables_expressions);
1563 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1566 EXPORT_SYMBOL_GPL(nft_register_expr);
1569 * nft_unregister_expr - unregister nf_tables expr type
1572 * Unregisters the expr typefor use with nf_tables.
1574 void nft_unregister_expr(struct nft_expr_type *type)
1576 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1577 list_del_rcu(&type->list);
1578 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1580 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1582 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1585 const struct nft_expr_type *type;
1587 list_for_each_entry(type, &nf_tables_expressions, list) {
1588 if (!nla_strcmp(nla, type->name) &&
1589 (!type->family || type->family == family))
1595 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1598 const struct nft_expr_type *type;
1601 return ERR_PTR(-EINVAL);
1603 type = __nft_expr_type_get(family, nla);
1604 if (type != NULL && try_module_get(type->owner))
1607 #ifdef CONFIG_MODULES
1609 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1610 request_module("nft-expr-%u-%.*s", family,
1611 nla_len(nla), (char *)nla_data(nla));
1612 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1613 if (__nft_expr_type_get(family, nla))
1614 return ERR_PTR(-EAGAIN);
1616 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1617 request_module("nft-expr-%.*s",
1618 nla_len(nla), (char *)nla_data(nla));
1619 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1620 if (__nft_expr_type_get(family, nla))
1621 return ERR_PTR(-EAGAIN);
1624 return ERR_PTR(-ENOENT);
1627 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1628 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1629 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1632 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1633 const struct nft_expr *expr)
1635 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1636 goto nla_put_failure;
1638 if (expr->ops->dump) {
1639 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1641 goto nla_put_failure;
1642 if (expr->ops->dump(skb, expr) < 0)
1643 goto nla_put_failure;
1644 nla_nest_end(skb, data);
1653 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1654 const struct nft_expr *expr)
1656 struct nlattr *nest;
1658 nest = nla_nest_start(skb, attr);
1660 goto nla_put_failure;
1661 if (nf_tables_fill_expr_info(skb, expr) < 0)
1662 goto nla_put_failure;
1663 nla_nest_end(skb, nest);
1670 struct nft_expr_info {
1671 const struct nft_expr_ops *ops;
1672 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1675 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1676 const struct nlattr *nla,
1677 struct nft_expr_info *info)
1679 const struct nft_expr_type *type;
1680 const struct nft_expr_ops *ops;
1681 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1684 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1688 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1690 return PTR_ERR(type);
1692 if (tb[NFTA_EXPR_DATA]) {
1693 err = nla_parse_nested(info->tb, type->maxattr,
1694 tb[NFTA_EXPR_DATA], type->policy);
1698 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1700 if (type->select_ops != NULL) {
1701 ops = type->select_ops(ctx,
1702 (const struct nlattr * const *)info->tb);
1714 module_put(type->owner);
1718 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1719 const struct nft_expr_info *info,
1720 struct nft_expr *expr)
1722 const struct nft_expr_ops *ops = info->ops;
1727 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1739 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1740 struct nft_expr *expr)
1742 if (expr->ops->destroy)
1743 expr->ops->destroy(ctx, expr);
1744 module_put(expr->ops->type->owner);
1747 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1748 const struct nlattr *nla)
1750 struct nft_expr_info info;
1751 struct nft_expr *expr;
1754 err = nf_tables_expr_parse(ctx, nla, &info);
1759 expr = kzalloc(info.ops->size, GFP_KERNEL);
1763 err = nf_tables_newexpr(ctx, &info, expr);
1771 module_put(info.ops->type->owner);
1773 return ERR_PTR(err);
1776 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1778 nf_tables_expr_destroy(ctx, expr);
1786 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1789 struct nft_rule *rule;
1791 // FIXME: this sucks
1792 list_for_each_entry(rule, &chain->rules, list) {
1793 if (handle == rule->handle)
1797 return ERR_PTR(-ENOENT);
1800 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1801 const struct nlattr *nla)
1804 return ERR_PTR(-EINVAL);
1806 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1809 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1810 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1811 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1812 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1813 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1814 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1815 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1816 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1817 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1818 .len = NFT_USERDATA_MAXLEN },
1821 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1822 u32 portid, u32 seq, int event,
1823 u32 flags, int family,
1824 const struct nft_table *table,
1825 const struct nft_chain *chain,
1826 const struct nft_rule *rule)
1828 struct nlmsghdr *nlh;
1829 struct nfgenmsg *nfmsg;
1830 const struct nft_expr *expr, *next;
1831 struct nlattr *list;
1832 const struct nft_rule *prule;
1833 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1835 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1838 goto nla_put_failure;
1840 nfmsg = nlmsg_data(nlh);
1841 nfmsg->nfgen_family = family;
1842 nfmsg->version = NFNETLINK_V0;
1843 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1845 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1846 goto nla_put_failure;
1847 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1848 goto nla_put_failure;
1849 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1851 goto nla_put_failure;
1853 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1854 prule = list_entry(rule->list.prev, struct nft_rule, list);
1855 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1856 cpu_to_be64(prule->handle),
1858 goto nla_put_failure;
1861 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1863 goto nla_put_failure;
1864 nft_rule_for_each_expr(expr, next, rule) {
1865 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
1866 goto nla_put_failure;
1868 nla_nest_end(skb, list);
1871 struct nft_userdata *udata = nft_userdata(rule);
1872 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1874 goto nla_put_failure;
1877 nlmsg_end(skb, nlh);
1881 nlmsg_trim(skb, nlh);
1885 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1886 const struct nft_rule *rule,
1889 struct sk_buff *skb;
1893 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1897 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1901 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1902 event, 0, ctx->afi->family, ctx->table,
1909 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1910 ctx->report, GFP_KERNEL);
1913 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1919 struct nft_rule_dump_ctx {
1920 char table[NFT_TABLE_MAXNAMELEN];
1921 char chain[NFT_CHAIN_MAXNAMELEN];
1924 static int nf_tables_dump_rules(struct sk_buff *skb,
1925 struct netlink_callback *cb)
1927 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1928 const struct nft_rule_dump_ctx *ctx = cb->data;
1929 const struct nft_af_info *afi;
1930 const struct nft_table *table;
1931 const struct nft_chain *chain;
1932 const struct nft_rule *rule;
1933 unsigned int idx = 0, s_idx = cb->args[0];
1934 struct net *net = sock_net(skb->sk);
1935 int family = nfmsg->nfgen_family;
1938 cb->seq = net->nft.base_seq;
1940 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1941 if (family != NFPROTO_UNSPEC && family != afi->family)
1944 list_for_each_entry_rcu(table, &afi->tables, list) {
1945 if (ctx && ctx->table[0] &&
1946 strcmp(ctx->table, table->name) != 0)
1949 list_for_each_entry_rcu(chain, &table->chains, list) {
1950 if (ctx && ctx->chain[0] &&
1951 strcmp(ctx->chain, chain->name) != 0)
1954 list_for_each_entry_rcu(rule, &chain->rules, list) {
1955 if (!nft_is_active(net, rule))
1960 memset(&cb->args[1], 0,
1961 sizeof(cb->args) - sizeof(cb->args[0]));
1962 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
1965 NLM_F_MULTI | NLM_F_APPEND,
1966 afi->family, table, chain, rule) < 0)
1969 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1983 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
1989 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
1990 struct sk_buff *skb, const struct nlmsghdr *nlh,
1991 const struct nlattr * const nla[])
1993 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1994 u8 genmask = nft_genmask_cur(net);
1995 const struct nft_af_info *afi;
1996 const struct nft_table *table;
1997 const struct nft_chain *chain;
1998 const struct nft_rule *rule;
1999 struct sk_buff *skb2;
2000 int family = nfmsg->nfgen_family;
2003 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2004 struct netlink_dump_control c = {
2005 .dump = nf_tables_dump_rules,
2006 .done = nf_tables_dump_rules_done,
2009 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2010 struct nft_rule_dump_ctx *ctx;
2012 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
2016 if (nla[NFTA_RULE_TABLE])
2017 nla_strlcpy(ctx->table, nla[NFTA_RULE_TABLE],
2018 sizeof(ctx->table));
2019 if (nla[NFTA_RULE_CHAIN])
2020 nla_strlcpy(ctx->chain, nla[NFTA_RULE_CHAIN],
2021 sizeof(ctx->chain));
2025 return netlink_dump_start(nlsk, skb, nlh, &c);
2028 afi = nf_tables_afinfo_lookup(net, family, false);
2030 return PTR_ERR(afi);
2032 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2034 return PTR_ERR(table);
2036 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2038 return PTR_ERR(chain);
2040 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2042 return PTR_ERR(rule);
2044 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2048 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2049 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2050 family, table, chain, rule);
2054 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2061 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2062 struct nft_rule *rule)
2064 struct nft_expr *expr;
2067 * Careful: some expressions might not be initialized in case this
2068 * is called on error from nf_tables_newrule().
2070 expr = nft_expr_first(rule);
2071 while (expr->ops && expr != nft_expr_last(rule)) {
2072 nf_tables_expr_destroy(ctx, expr);
2073 expr = nft_expr_next(expr);
2078 #define NFT_RULE_MAXEXPRS 128
2080 static struct nft_expr_info *info;
2082 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2083 struct sk_buff *skb, const struct nlmsghdr *nlh,
2084 const struct nlattr * const nla[])
2086 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2087 u8 genmask = nft_genmask_next(net);
2088 struct nft_af_info *afi;
2089 struct nft_table *table;
2090 struct nft_chain *chain;
2091 struct nft_rule *rule, *old_rule = NULL;
2092 struct nft_userdata *udata;
2093 struct nft_trans *trans = NULL;
2094 struct nft_expr *expr;
2097 unsigned int size, i, n, ulen = 0, usize = 0;
2100 u64 handle, pos_handle;
2102 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2104 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2106 return PTR_ERR(afi);
2108 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2110 return PTR_ERR(table);
2112 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2114 return PTR_ERR(chain);
2116 if (nla[NFTA_RULE_HANDLE]) {
2117 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2118 rule = __nf_tables_rule_lookup(chain, handle);
2120 return PTR_ERR(rule);
2122 if (nlh->nlmsg_flags & NLM_F_EXCL)
2124 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2129 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2131 handle = nf_tables_alloc_handle(table);
2133 if (chain->use == UINT_MAX)
2137 if (nla[NFTA_RULE_POSITION]) {
2138 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2141 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2142 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2143 if (IS_ERR(old_rule))
2144 return PTR_ERR(old_rule);
2147 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2151 if (nla[NFTA_RULE_EXPRESSIONS]) {
2152 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2154 if (nla_type(tmp) != NFTA_LIST_ELEM)
2156 if (n == NFT_RULE_MAXEXPRS)
2158 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2161 size += info[n].ops->size;
2165 /* Check for overflow of dlen field */
2167 if (size >= 1 << 12)
2170 if (nla[NFTA_RULE_USERDATA]) {
2171 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2173 usize = sizeof(struct nft_userdata) + ulen;
2177 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2181 nft_activate_next(net, rule);
2183 rule->handle = handle;
2185 rule->udata = ulen ? 1 : 0;
2188 udata = nft_userdata(rule);
2189 udata->len = ulen - 1;
2190 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2193 expr = nft_expr_first(rule);
2194 for (i = 0; i < n; i++) {
2195 err = nf_tables_newexpr(&ctx, &info[i], expr);
2199 expr = nft_expr_next(expr);
2202 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2203 if (nft_is_active_next(net, old_rule)) {
2204 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2206 if (trans == NULL) {
2210 nft_deactivate_next(net, old_rule);
2212 list_add_tail_rcu(&rule->list, &old_rule->list);
2217 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2219 list_add_rcu(&rule->list, &old_rule->list);
2221 list_add_tail_rcu(&rule->list, &chain->rules);
2224 list_add_tail_rcu(&rule->list, &old_rule->list);
2226 list_add_rcu(&rule->list, &chain->rules);
2229 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2237 list_del_rcu(&rule->list);
2239 nf_tables_rule_destroy(&ctx, rule);
2241 for (i = 0; i < n; i++) {
2242 if (info[i].ops != NULL)
2243 module_put(info[i].ops->type->owner);
2248 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2249 struct sk_buff *skb, const struct nlmsghdr *nlh,
2250 const struct nlattr * const nla[])
2252 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2253 u8 genmask = nft_genmask_next(net);
2254 struct nft_af_info *afi;
2255 struct nft_table *table;
2256 struct nft_chain *chain = NULL;
2257 struct nft_rule *rule;
2258 int family = nfmsg->nfgen_family, err = 0;
2261 afi = nf_tables_afinfo_lookup(net, family, false);
2263 return PTR_ERR(afi);
2265 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2267 return PTR_ERR(table);
2269 if (nla[NFTA_RULE_CHAIN]) {
2270 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2273 return PTR_ERR(chain);
2276 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2279 if (nla[NFTA_RULE_HANDLE]) {
2280 rule = nf_tables_rule_lookup(chain,
2281 nla[NFTA_RULE_HANDLE]);
2283 return PTR_ERR(rule);
2285 err = nft_delrule(&ctx, rule);
2287 err = nft_delrule_by_chain(&ctx);
2290 list_for_each_entry(chain, &table->chains, list) {
2291 if (!nft_is_active_next(net, chain))
2295 err = nft_delrule_by_chain(&ctx);
2308 static LIST_HEAD(nf_tables_set_ops);
2310 int nft_register_set(struct nft_set_ops *ops)
2312 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2313 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2314 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2317 EXPORT_SYMBOL_GPL(nft_register_set);
2319 void nft_unregister_set(struct nft_set_ops *ops)
2321 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2322 list_del_rcu(&ops->list);
2323 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2325 EXPORT_SYMBOL_GPL(nft_unregister_set);
2328 * Select a set implementation based on the data characteristics and the
2329 * given policy. The total memory use might not be known if no size is
2330 * given, in that case the amount of memory per element is used.
2332 static const struct nft_set_ops *
2333 nft_select_set_ops(const struct nlattr * const nla[],
2334 const struct nft_set_desc *desc,
2335 enum nft_set_policies policy)
2337 const struct nft_set_ops *ops, *bops;
2338 struct nft_set_estimate est, best;
2341 #ifdef CONFIG_MODULES
2342 if (list_empty(&nf_tables_set_ops)) {
2343 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2344 request_module("nft-set");
2345 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2346 if (!list_empty(&nf_tables_set_ops))
2347 return ERR_PTR(-EAGAIN);
2351 if (nla[NFTA_SET_FLAGS] != NULL) {
2352 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2353 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT;
2360 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2361 if ((ops->features & features) != features)
2363 if (!ops->estimate(desc, features, &est))
2367 case NFT_SET_POL_PERFORMANCE:
2368 if (est.class < best.class)
2370 if (est.class == best.class && est.size < best.size)
2373 case NFT_SET_POL_MEMORY:
2374 if (est.size < best.size)
2376 if (est.size == best.size && est.class < best.class)
2383 if (!try_module_get(ops->owner))
2386 module_put(bops->owner);
2395 return ERR_PTR(-EOPNOTSUPP);
2398 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2399 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2400 [NFTA_SET_NAME] = { .type = NLA_STRING,
2401 .len = NFT_SET_MAXNAMELEN - 1 },
2402 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2403 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2404 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2405 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2406 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2407 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2408 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2409 [NFTA_SET_ID] = { .type = NLA_U32 },
2410 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2411 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2412 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2413 .len = NFT_USERDATA_MAXLEN },
2416 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2417 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2420 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2421 const struct sk_buff *skb,
2422 const struct nlmsghdr *nlh,
2423 const struct nlattr * const nla[],
2426 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2427 struct nft_af_info *afi = NULL;
2428 struct nft_table *table = NULL;
2430 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2431 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2433 return PTR_ERR(afi);
2436 if (nla[NFTA_SET_TABLE] != NULL) {
2438 return -EAFNOSUPPORT;
2440 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2443 return PTR_ERR(table);
2446 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
2450 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2451 const struct nlattr *nla, u8 genmask)
2453 struct nft_set *set;
2456 return ERR_PTR(-EINVAL);
2458 list_for_each_entry(set, &table->sets, list) {
2459 if (!nla_strcmp(nla, set->name) &&
2460 nft_active_genmask(set, genmask))
2463 return ERR_PTR(-ENOENT);
2466 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2467 const struct nlattr *nla,
2470 struct nft_trans *trans;
2471 u32 id = ntohl(nla_get_be32(nla));
2473 list_for_each_entry(trans, &net->nft.commit_list, list) {
2474 struct nft_set *set = nft_trans_set(trans);
2476 if (trans->msg_type == NFT_MSG_NEWSET &&
2477 id == nft_trans_set_id(trans) &&
2478 nft_active_genmask(set, genmask))
2481 return ERR_PTR(-ENOENT);
2484 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2487 const struct nft_set *i;
2489 unsigned long *inuse;
2490 unsigned int n = 0, min = 0;
2492 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
2494 if (p[1] != 'd' || strchr(p + 2, '%'))
2497 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2501 list_for_each_entry(i, &ctx->table->sets, list) {
2504 if (!nft_is_active_next(ctx->net, set))
2506 if (!sscanf(i->name, name, &tmp))
2508 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2511 set_bit(tmp - min, inuse);
2514 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2515 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2516 min += BITS_PER_BYTE * PAGE_SIZE;
2517 memset(inuse, 0, PAGE_SIZE);
2520 free_page((unsigned long)inuse);
2523 snprintf(set->name, sizeof(set->name), name, min + n);
2524 list_for_each_entry(i, &ctx->table->sets, list) {
2525 if (!nft_is_active_next(ctx->net, i))
2527 if (!strcmp(set->name, i->name))
2533 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2534 const struct nft_set *set, u16 event, u16 flags)
2536 struct nfgenmsg *nfmsg;
2537 struct nlmsghdr *nlh;
2538 struct nlattr *desc;
2539 u32 portid = ctx->portid;
2542 event |= NFNL_SUBSYS_NFTABLES << 8;
2543 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2546 goto nla_put_failure;
2548 nfmsg = nlmsg_data(nlh);
2549 nfmsg->nfgen_family = ctx->afi->family;
2550 nfmsg->version = NFNETLINK_V0;
2551 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2553 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2554 goto nla_put_failure;
2555 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2556 goto nla_put_failure;
2557 if (set->flags != 0)
2558 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2559 goto nla_put_failure;
2561 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2562 goto nla_put_failure;
2563 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2564 goto nla_put_failure;
2565 if (set->flags & NFT_SET_MAP) {
2566 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2567 goto nla_put_failure;
2568 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2569 goto nla_put_failure;
2573 nla_put_be64(skb, NFTA_SET_TIMEOUT, cpu_to_be64(set->timeout),
2575 goto nla_put_failure;
2577 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2578 goto nla_put_failure;
2580 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2581 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2582 goto nla_put_failure;
2585 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2586 goto nla_put_failure;
2588 desc = nla_nest_start(skb, NFTA_SET_DESC);
2590 goto nla_put_failure;
2592 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2593 goto nla_put_failure;
2594 nla_nest_end(skb, desc);
2596 nlmsg_end(skb, nlh);
2600 nlmsg_trim(skb, nlh);
2604 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2605 const struct nft_set *set,
2606 int event, gfp_t gfp_flags)
2608 struct sk_buff *skb;
2609 u32 portid = ctx->portid;
2613 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2617 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2621 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2627 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2628 ctx->report, gfp_flags);
2631 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2635 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2637 const struct nft_set *set;
2638 unsigned int idx, s_idx = cb->args[0];
2639 struct nft_af_info *afi;
2640 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2641 struct net *net = sock_net(skb->sk);
2642 int cur_family = cb->args[3];
2643 struct nft_ctx *ctx = cb->data, ctx_set;
2649 cb->seq = net->nft.base_seq;
2651 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2652 if (ctx->afi && ctx->afi != afi)
2656 if (afi->family != cur_family)
2661 list_for_each_entry_rcu(table, &afi->tables, list) {
2662 if (ctx->table && ctx->table != table)
2666 if (cur_table != table)
2672 list_for_each_entry_rcu(set, &table->sets, list) {
2675 if (!nft_is_active(net, set))
2679 ctx_set.table = table;
2681 if (nf_tables_fill_set(skb, &ctx_set, set,
2685 cb->args[2] = (unsigned long) table;
2686 cb->args[3] = afi->family;
2689 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2703 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2709 static int nf_tables_getset(struct net *net, struct sock *nlsk,
2710 struct sk_buff *skb, const struct nlmsghdr *nlh,
2711 const struct nlattr * const nla[])
2713 u8 genmask = nft_genmask_cur(net);
2714 const struct nft_set *set;
2716 struct sk_buff *skb2;
2717 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2720 /* Verify existence before starting dump */
2721 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
2725 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2726 struct netlink_dump_control c = {
2727 .dump = nf_tables_dump_sets,
2728 .done = nf_tables_dump_sets_done,
2730 struct nft_ctx *ctx_dump;
2732 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2733 if (ctx_dump == NULL)
2739 return netlink_dump_start(nlsk, skb, nlh, &c);
2742 /* Only accept unspec with dump */
2743 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2744 return -EAFNOSUPPORT;
2745 if (!nla[NFTA_SET_TABLE])
2748 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
2750 return PTR_ERR(set);
2752 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2756 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2760 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2767 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2768 struct nft_set_desc *desc,
2769 const struct nlattr *nla)
2771 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2774 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2778 if (da[NFTA_SET_DESC_SIZE] != NULL)
2779 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2784 static int nf_tables_newset(struct net *net, struct sock *nlsk,
2785 struct sk_buff *skb, const struct nlmsghdr *nlh,
2786 const struct nlattr * const nla[])
2788 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2789 u8 genmask = nft_genmask_next(net);
2790 const struct nft_set_ops *ops;
2791 struct nft_af_info *afi;
2792 struct nft_table *table;
2793 struct nft_set *set;
2795 char name[NFT_SET_MAXNAMELEN];
2799 u32 ktype, dtype, flags, policy, gc_int;
2800 struct nft_set_desc desc;
2801 unsigned char *udata;
2805 if (nla[NFTA_SET_TABLE] == NULL ||
2806 nla[NFTA_SET_NAME] == NULL ||
2807 nla[NFTA_SET_KEY_LEN] == NULL ||
2808 nla[NFTA_SET_ID] == NULL)
2811 memset(&desc, 0, sizeof(desc));
2813 ktype = NFT_DATA_VALUE;
2814 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2815 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2816 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2820 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2821 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
2825 if (nla[NFTA_SET_FLAGS] != NULL) {
2826 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2827 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2828 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2829 NFT_SET_MAP | NFT_SET_EVAL))
2831 /* Only one of both operations is supported */
2832 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL)) ==
2833 (NFT_SET_MAP | NFT_SET_EVAL))
2838 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2839 if (!(flags & NFT_SET_MAP))
2842 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2843 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2844 dtype != NFT_DATA_VERDICT)
2847 if (dtype != NFT_DATA_VERDICT) {
2848 if (nla[NFTA_SET_DATA_LEN] == NULL)
2850 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2851 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
2854 desc.dlen = sizeof(struct nft_verdict);
2855 } else if (flags & NFT_SET_MAP)
2859 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2860 if (!(flags & NFT_SET_TIMEOUT))
2862 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_TIMEOUT]));
2865 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2866 if (!(flags & NFT_SET_TIMEOUT))
2868 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2871 policy = NFT_SET_POL_PERFORMANCE;
2872 if (nla[NFTA_SET_POLICY] != NULL)
2873 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2875 if (nla[NFTA_SET_DESC] != NULL) {
2876 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2881 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2883 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2885 return PTR_ERR(afi);
2887 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
2889 return PTR_ERR(table);
2891 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
2893 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
2895 if (PTR_ERR(set) != -ENOENT)
2896 return PTR_ERR(set);
2901 if (nlh->nlmsg_flags & NLM_F_EXCL)
2903 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2908 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2911 ops = nft_select_set_ops(nla, &desc, policy);
2913 return PTR_ERR(ops);
2916 if (nla[NFTA_SET_USERDATA])
2917 udlen = nla_len(nla[NFTA_SET_USERDATA]);
2920 if (ops->privsize != NULL)
2921 size = ops->privsize(nla);
2924 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
2928 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2929 err = nf_tables_set_alloc_name(&ctx, set, name);
2935 udata = set->data + size;
2936 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
2939 INIT_LIST_HEAD(&set->bindings);
2942 set->klen = desc.klen;
2944 set->dlen = desc.dlen;
2946 set->size = desc.size;
2947 set->policy = policy;
2950 set->timeout = timeout;
2951 set->gc_int = gc_int;
2953 err = ops->init(set, &desc, nla);
2957 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2961 list_add_tail_rcu(&set->list, &table->sets);
2968 module_put(ops->owner);
2972 static void nft_set_destroy(struct nft_set *set)
2974 set->ops->destroy(set);
2975 module_put(set->ops->owner);
2979 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2981 list_del_rcu(&set->list);
2982 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
2983 nft_set_destroy(set);
2986 static int nf_tables_delset(struct net *net, struct sock *nlsk,
2987 struct sk_buff *skb, const struct nlmsghdr *nlh,
2988 const struct nlattr * const nla[])
2990 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2991 u8 genmask = nft_genmask_next(net);
2992 struct nft_set *set;
2996 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2997 return -EAFNOSUPPORT;
2998 if (nla[NFTA_SET_TABLE] == NULL)
3001 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
3005 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3007 return PTR_ERR(set);
3008 if (!list_empty(&set->bindings))
3011 return nft_delset(&ctx, set);
3014 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3015 const struct nft_set *set,
3016 const struct nft_set_iter *iter,
3017 const struct nft_set_elem *elem)
3019 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3020 enum nft_registers dreg;
3022 dreg = nft_type_to_reg(set->dtype);
3023 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3024 set->dtype == NFT_DATA_VERDICT ?
3025 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3029 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3030 struct nft_set_binding *binding)
3032 struct nft_set_binding *i;
3033 struct nft_set_iter iter;
3035 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
3038 if (binding->flags & NFT_SET_MAP) {
3039 /* If the set is already bound to the same chain all
3040 * jumps are already validated for that chain.
3042 list_for_each_entry(i, &set->bindings, list) {
3043 if (i->flags & NFT_SET_MAP &&
3044 i->chain == binding->chain)
3048 iter.genmask = nft_genmask_next(ctx->net);
3052 iter.fn = nf_tables_bind_check_setelem;
3054 set->ops->walk(ctx, set, &iter);
3059 binding->chain = ctx->chain;
3060 list_add_tail_rcu(&binding->list, &set->bindings);
3064 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3065 struct nft_set_binding *binding)
3067 list_del_rcu(&binding->list);
3069 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
3070 nft_is_active(ctx->net, set))
3071 nf_tables_set_destroy(ctx, set);
3074 const struct nft_set_ext_type nft_set_ext_types[] = {
3075 [NFT_SET_EXT_KEY] = {
3076 .align = __alignof__(u32),
3078 [NFT_SET_EXT_DATA] = {
3079 .align = __alignof__(u32),
3081 [NFT_SET_EXT_EXPR] = {
3082 .align = __alignof__(struct nft_expr),
3084 [NFT_SET_EXT_FLAGS] = {
3086 .align = __alignof__(u8),
3088 [NFT_SET_EXT_TIMEOUT] = {
3090 .align = __alignof__(u64),
3092 [NFT_SET_EXT_EXPIRATION] = {
3093 .len = sizeof(unsigned long),
3094 .align = __alignof__(unsigned long),
3096 [NFT_SET_EXT_USERDATA] = {
3097 .len = sizeof(struct nft_userdata),
3098 .align = __alignof__(struct nft_userdata),
3101 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3107 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3108 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3109 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3110 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3111 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3112 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3113 .len = NFT_USERDATA_MAXLEN },
3116 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3117 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
3118 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
3119 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3120 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3123 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3124 const struct sk_buff *skb,
3125 const struct nlmsghdr *nlh,
3126 const struct nlattr * const nla[],
3129 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3130 struct nft_af_info *afi;
3131 struct nft_table *table;
3133 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3135 return PTR_ERR(afi);
3137 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3140 return PTR_ERR(table);
3142 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
3146 static int nf_tables_fill_setelem(struct sk_buff *skb,
3147 const struct nft_set *set,
3148 const struct nft_set_elem *elem)
3150 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3151 unsigned char *b = skb_tail_pointer(skb);
3152 struct nlattr *nest;
3154 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3156 goto nla_put_failure;
3158 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3159 NFT_DATA_VALUE, set->klen) < 0)
3160 goto nla_put_failure;
3162 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3163 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3164 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3166 goto nla_put_failure;
3168 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3169 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3170 goto nla_put_failure;
3172 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3173 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3174 htonl(*nft_set_ext_flags(ext))))
3175 goto nla_put_failure;
3177 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3178 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3179 cpu_to_be64(*nft_set_ext_timeout(ext)),
3181 goto nla_put_failure;
3183 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3184 unsigned long expires, now = jiffies;
3186 expires = *nft_set_ext_expiration(ext);
3187 if (time_before(now, expires))
3192 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3193 cpu_to_be64(jiffies_to_msecs(expires)),
3195 goto nla_put_failure;
3198 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3199 struct nft_userdata *udata;
3201 udata = nft_set_ext_userdata(ext);
3202 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3203 udata->len + 1, udata->data))
3204 goto nla_put_failure;
3207 nla_nest_end(skb, nest);
3215 struct nft_set_dump_args {
3216 const struct netlink_callback *cb;
3217 struct nft_set_iter iter;
3218 struct sk_buff *skb;
3221 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3222 const struct nft_set *set,
3223 const struct nft_set_iter *iter,
3224 const struct nft_set_elem *elem)
3226 struct nft_set_dump_args *args;
3228 args = container_of(iter, struct nft_set_dump_args, iter);
3229 return nf_tables_fill_setelem(args->skb, set, elem);
3232 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3234 struct net *net = sock_net(skb->sk);
3235 u8 genmask = nft_genmask_cur(net);
3236 const struct nft_set *set;
3237 struct nft_set_dump_args args;
3239 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3240 struct nfgenmsg *nfmsg;
3241 struct nlmsghdr *nlh;
3242 struct nlattr *nest;
3246 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3247 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
3251 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
3252 (void *)nla, genmask);
3256 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3259 return PTR_ERR(set);
3261 event = NFT_MSG_NEWSETELEM;
3262 event |= NFNL_SUBSYS_NFTABLES << 8;
3263 portid = NETLINK_CB(cb->skb).portid;
3264 seq = cb->nlh->nlmsg_seq;
3266 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3269 goto nla_put_failure;
3271 nfmsg = nlmsg_data(nlh);
3272 nfmsg->nfgen_family = ctx.afi->family;
3273 nfmsg->version = NFNETLINK_V0;
3274 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
3276 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3277 goto nla_put_failure;
3278 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3279 goto nla_put_failure;
3281 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3283 goto nla_put_failure;
3287 args.iter.genmask = nft_genmask_cur(ctx.net);
3288 args.iter.skip = cb->args[0];
3289 args.iter.count = 0;
3291 args.iter.fn = nf_tables_dump_setelem;
3292 set->ops->walk(&ctx, set, &args.iter);
3294 nla_nest_end(skb, nest);
3295 nlmsg_end(skb, nlh);
3297 if (args.iter.err && args.iter.err != -EMSGSIZE)
3298 return args.iter.err;
3299 if (args.iter.count == cb->args[0])
3302 cb->args[0] = args.iter.count;
3309 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3310 struct sk_buff *skb, const struct nlmsghdr *nlh,
3311 const struct nlattr * const nla[])
3313 u8 genmask = nft_genmask_cur(net);
3314 const struct nft_set *set;
3318 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3322 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3325 return PTR_ERR(set);
3327 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3328 struct netlink_dump_control c = {
3329 .dump = nf_tables_dump_set,
3331 return netlink_dump_start(nlsk, skb, nlh, &c);
3336 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3337 const struct nft_ctx *ctx, u32 seq,
3338 u32 portid, int event, u16 flags,
3339 const struct nft_set *set,
3340 const struct nft_set_elem *elem)
3342 struct nfgenmsg *nfmsg;
3343 struct nlmsghdr *nlh;
3344 struct nlattr *nest;
3347 event |= NFNL_SUBSYS_NFTABLES << 8;
3348 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3351 goto nla_put_failure;
3353 nfmsg = nlmsg_data(nlh);
3354 nfmsg->nfgen_family = ctx->afi->family;
3355 nfmsg->version = NFNETLINK_V0;
3356 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3358 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3359 goto nla_put_failure;
3360 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3361 goto nla_put_failure;
3363 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3365 goto nla_put_failure;
3367 err = nf_tables_fill_setelem(skb, set, elem);
3369 goto nla_put_failure;
3371 nla_nest_end(skb, nest);
3373 nlmsg_end(skb, nlh);
3377 nlmsg_trim(skb, nlh);
3381 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3382 const struct nft_set *set,
3383 const struct nft_set_elem *elem,
3384 int event, u16 flags)
3386 struct net *net = ctx->net;
3387 u32 portid = ctx->portid;
3388 struct sk_buff *skb;
3391 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3395 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3399 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3406 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3410 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3414 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3416 struct nft_set *set)
3418 struct nft_trans *trans;
3420 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3424 nft_trans_elem_set(trans) = set;
3428 void *nft_set_elem_init(const struct nft_set *set,
3429 const struct nft_set_ext_tmpl *tmpl,
3430 const u32 *key, const u32 *data,
3431 u64 timeout, gfp_t gfp)
3433 struct nft_set_ext *ext;
3436 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3440 ext = nft_set_elem_ext(set, elem);
3441 nft_set_ext_init(ext, tmpl);
3443 memcpy(nft_set_ext_key(ext), key, set->klen);
3444 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3445 memcpy(nft_set_ext_data(ext), data, set->dlen);
3446 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3447 *nft_set_ext_expiration(ext) =
3448 jiffies + msecs_to_jiffies(timeout);
3449 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3450 *nft_set_ext_timeout(ext) = timeout;
3455 void nft_set_elem_destroy(const struct nft_set *set, void *elem)
3457 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3459 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3460 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3461 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
3462 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3463 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3467 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3469 static int nft_setelem_parse_flags(const struct nft_set *set,
3470 const struct nlattr *attr, u32 *flags)
3475 *flags = ntohl(nla_get_be32(attr));
3476 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3478 if (!(set->flags & NFT_SET_INTERVAL) &&
3479 *flags & NFT_SET_ELEM_INTERVAL_END)
3485 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3486 const struct nlattr *attr, u32 nlmsg_flags)
3488 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3489 struct nft_data_desc d1, d2;
3490 struct nft_set_ext_tmpl tmpl;
3491 struct nft_set_ext *ext, *ext2;
3492 struct nft_set_elem elem;
3493 struct nft_set_binding *binding;
3494 struct nft_userdata *udata;
3495 struct nft_data data;
3496 enum nft_registers dreg;
3497 struct nft_trans *trans;
3503 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3504 nft_set_elem_policy);
3508 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3511 nft_set_ext_prepare(&tmpl);
3513 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3517 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3519 if (set->flags & NFT_SET_MAP) {
3520 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3521 !(flags & NFT_SET_ELEM_INTERVAL_END))
3523 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3524 flags & NFT_SET_ELEM_INTERVAL_END)
3527 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3532 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3533 if (!(set->flags & NFT_SET_TIMEOUT))
3535 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_ELEM_TIMEOUT]));
3536 } else if (set->flags & NFT_SET_TIMEOUT) {
3537 timeout = set->timeout;
3540 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3541 nla[NFTA_SET_ELEM_KEY]);
3545 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3548 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3550 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3551 if (timeout != set->timeout)
3552 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3555 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3556 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3557 nla[NFTA_SET_ELEM_DATA]);
3562 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3565 dreg = nft_type_to_reg(set->dtype);
3566 list_for_each_entry(binding, &set->bindings, list) {
3567 struct nft_ctx bind_ctx = {
3569 .table = ctx->table,
3570 .chain = (struct nft_chain *)binding->chain,
3573 if (!(binding->flags & NFT_SET_MAP))
3576 err = nft_validate_register_store(&bind_ctx, dreg,
3583 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
3586 /* The full maximum length of userdata can exceed the maximum
3587 * offset value (U8_MAX) for following extensions, therefor it
3588 * must be the last extension added.
3591 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3592 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3594 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3599 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
3600 timeout, GFP_KERNEL);
3601 if (elem.priv == NULL)
3604 ext = nft_set_elem_ext(set, elem.priv);
3606 *nft_set_ext_flags(ext) = flags;
3608 udata = nft_set_ext_userdata(ext);
3609 udata->len = ulen - 1;
3610 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3613 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3617 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
3618 err = set->ops->insert(ctx->net, set, &elem, &ext2);
3620 if (err == -EEXIST) {
3621 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3622 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
3623 memcmp(nft_set_ext_data(ext),
3624 nft_set_ext_data(ext2), set->dlen) != 0)
3626 else if (!(nlmsg_flags & NLM_F_EXCL))
3632 nft_trans_elem(trans) = elem;
3633 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3641 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3642 nft_data_uninit(&data, d2.type);
3644 nft_data_uninit(&elem.key.val, d1.type);
3649 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3650 struct sk_buff *skb, const struct nlmsghdr *nlh,
3651 const struct nlattr * const nla[])
3653 u8 genmask = nft_genmask_next(net);
3654 const struct nlattr *attr;
3655 struct nft_set *set;
3659 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3662 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3666 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3669 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3670 set = nf_tables_set_lookup_byid(net,
3671 nla[NFTA_SET_ELEM_LIST_SET_ID],
3675 return PTR_ERR(set);
3678 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3681 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3683 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact))
3686 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
3688 atomic_dec(&set->nelems);
3695 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3696 const struct nlattr *attr)
3698 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3699 struct nft_set_ext_tmpl tmpl;
3700 struct nft_data_desc desc;
3701 struct nft_set_elem elem;
3702 struct nft_set_ext *ext;
3703 struct nft_trans *trans;
3708 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3709 nft_set_elem_policy);
3714 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3717 nft_set_ext_prepare(&tmpl);
3719 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3723 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3725 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3726 nla[NFTA_SET_ELEM_KEY]);
3731 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3734 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3737 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3739 if (elem.priv == NULL)
3742 ext = nft_set_elem_ext(set, elem.priv);
3744 *nft_set_ext_flags(ext) = flags;
3746 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3747 if (trans == NULL) {
3752 priv = set->ops->deactivate(ctx->net, set, &elem);
3760 nft_trans_elem(trans) = elem;
3761 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3769 nft_data_uninit(&elem.key.val, desc.type);
3774 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3775 struct sk_buff *skb, const struct nlmsghdr *nlh,
3776 const struct nlattr * const nla[])
3778 u8 genmask = nft_genmask_next(net);
3779 const struct nlattr *attr;
3780 struct nft_set *set;
3784 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3787 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3791 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3794 return PTR_ERR(set);
3795 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3798 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3799 err = nft_del_setelem(&ctx, set, attr);
3808 void nft_set_gc_batch_release(struct rcu_head *rcu)
3810 struct nft_set_gc_batch *gcb;
3813 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
3814 for (i = 0; i < gcb->head.cnt; i++)
3815 nft_set_elem_destroy(gcb->head.set, gcb->elems[i]);
3818 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
3820 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
3823 struct nft_set_gc_batch *gcb;
3825 gcb = kzalloc(sizeof(*gcb), gfp);
3828 gcb->head.set = set;
3831 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
3833 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
3834 u32 portid, u32 seq)
3836 struct nlmsghdr *nlh;
3837 struct nfgenmsg *nfmsg;
3838 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
3840 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
3842 goto nla_put_failure;
3844 nfmsg = nlmsg_data(nlh);
3845 nfmsg->nfgen_family = AF_UNSPEC;
3846 nfmsg->version = NFNETLINK_V0;
3847 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3849 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
3850 goto nla_put_failure;
3852 nlmsg_end(skb, nlh);
3856 nlmsg_trim(skb, nlh);
3860 static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
3862 struct nlmsghdr *nlh = nlmsg_hdr(skb);
3863 struct sk_buff *skb2;
3866 if (nlmsg_report(nlh) &&
3867 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3871 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3875 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3882 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
3883 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
3886 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
3892 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
3893 struct sk_buff *skb, const struct nlmsghdr *nlh,
3894 const struct nlattr * const nla[])
3896 struct sk_buff *skb2;
3899 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3903 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3908 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3914 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3915 [NFT_MSG_NEWTABLE] = {
3916 .call_batch = nf_tables_newtable,
3917 .attr_count = NFTA_TABLE_MAX,
3918 .policy = nft_table_policy,
3920 [NFT_MSG_GETTABLE] = {
3921 .call = nf_tables_gettable,
3922 .attr_count = NFTA_TABLE_MAX,
3923 .policy = nft_table_policy,
3925 [NFT_MSG_DELTABLE] = {
3926 .call_batch = nf_tables_deltable,
3927 .attr_count = NFTA_TABLE_MAX,
3928 .policy = nft_table_policy,
3930 [NFT_MSG_NEWCHAIN] = {
3931 .call_batch = nf_tables_newchain,
3932 .attr_count = NFTA_CHAIN_MAX,
3933 .policy = nft_chain_policy,
3935 [NFT_MSG_GETCHAIN] = {
3936 .call = nf_tables_getchain,
3937 .attr_count = NFTA_CHAIN_MAX,
3938 .policy = nft_chain_policy,
3940 [NFT_MSG_DELCHAIN] = {
3941 .call_batch = nf_tables_delchain,
3942 .attr_count = NFTA_CHAIN_MAX,
3943 .policy = nft_chain_policy,
3945 [NFT_MSG_NEWRULE] = {
3946 .call_batch = nf_tables_newrule,
3947 .attr_count = NFTA_RULE_MAX,
3948 .policy = nft_rule_policy,
3950 [NFT_MSG_GETRULE] = {
3951 .call = nf_tables_getrule,
3952 .attr_count = NFTA_RULE_MAX,
3953 .policy = nft_rule_policy,
3955 [NFT_MSG_DELRULE] = {
3956 .call_batch = nf_tables_delrule,
3957 .attr_count = NFTA_RULE_MAX,
3958 .policy = nft_rule_policy,
3960 [NFT_MSG_NEWSET] = {
3961 .call_batch = nf_tables_newset,
3962 .attr_count = NFTA_SET_MAX,
3963 .policy = nft_set_policy,
3965 [NFT_MSG_GETSET] = {
3966 .call = nf_tables_getset,
3967 .attr_count = NFTA_SET_MAX,
3968 .policy = nft_set_policy,
3970 [NFT_MSG_DELSET] = {
3971 .call_batch = nf_tables_delset,
3972 .attr_count = NFTA_SET_MAX,
3973 .policy = nft_set_policy,
3975 [NFT_MSG_NEWSETELEM] = {
3976 .call_batch = nf_tables_newsetelem,
3977 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3978 .policy = nft_set_elem_list_policy,
3980 [NFT_MSG_GETSETELEM] = {
3981 .call = nf_tables_getsetelem,
3982 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3983 .policy = nft_set_elem_list_policy,
3985 [NFT_MSG_DELSETELEM] = {
3986 .call_batch = nf_tables_delsetelem,
3987 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3988 .policy = nft_set_elem_list_policy,
3990 [NFT_MSG_GETGEN] = {
3991 .call = nf_tables_getgen,
3995 static void nft_chain_commit_update(struct nft_trans *trans)
3997 struct nft_base_chain *basechain;
3999 if (nft_trans_chain_name(trans)[0])
4000 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
4002 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
4005 basechain = nft_base_chain(trans->ctx.chain);
4006 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
4008 switch (nft_trans_chain_policy(trans)) {
4011 basechain->policy = nft_trans_chain_policy(trans);
4016 static void nf_tables_commit_release(struct nft_trans *trans)
4018 switch (trans->msg_type) {
4019 case NFT_MSG_DELTABLE:
4020 nf_tables_table_destroy(&trans->ctx);
4022 case NFT_MSG_DELCHAIN:
4023 nf_tables_chain_destroy(trans->ctx.chain);
4025 case NFT_MSG_DELRULE:
4026 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4028 case NFT_MSG_DELSET:
4029 nft_set_destroy(nft_trans_set(trans));
4031 case NFT_MSG_DELSETELEM:
4032 nft_set_elem_destroy(nft_trans_elem_set(trans),
4033 nft_trans_elem(trans).priv);
4039 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
4041 struct nft_trans *trans, *next;
4042 struct nft_trans_elem *te;
4044 /* Bump generation counter, invalidate any dump in progress */
4045 while (++net->nft.base_seq == 0);
4047 /* A new generation has just started */
4048 net->nft.gencursor = nft_gencursor_next(net);
4050 /* Make sure all packets have left the previous generation before
4051 * purging old rules.
4055 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4056 switch (trans->msg_type) {
4057 case NFT_MSG_NEWTABLE:
4058 if (nft_trans_table_update(trans)) {
4059 if (!nft_trans_table_enable(trans)) {
4060 nf_tables_table_disable(net,
4063 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4066 nft_clear(net, trans->ctx.table);
4068 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
4069 nft_trans_destroy(trans);
4071 case NFT_MSG_DELTABLE:
4072 list_del_rcu(&trans->ctx.table->list);
4073 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
4075 case NFT_MSG_NEWCHAIN:
4076 if (nft_trans_chain_update(trans))
4077 nft_chain_commit_update(trans);
4079 nft_clear(net, trans->ctx.chain);
4081 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
4082 nft_trans_destroy(trans);
4084 case NFT_MSG_DELCHAIN:
4085 list_del_rcu(&trans->ctx.chain->list);
4086 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
4087 nf_tables_unregister_hooks(trans->ctx.net,
4090 trans->ctx.afi->nops);
4092 case NFT_MSG_NEWRULE:
4093 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4094 nf_tables_rule_notify(&trans->ctx,
4095 nft_trans_rule(trans),
4097 nft_trans_destroy(trans);
4099 case NFT_MSG_DELRULE:
4100 list_del_rcu(&nft_trans_rule(trans)->list);
4101 nf_tables_rule_notify(&trans->ctx,
4102 nft_trans_rule(trans),
4105 case NFT_MSG_NEWSET:
4106 nft_clear(net, nft_trans_set(trans));
4107 /* This avoids hitting -EBUSY when deleting the table
4108 * from the transaction.
4110 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4111 !list_empty(&nft_trans_set(trans)->bindings))
4112 trans->ctx.table->use--;
4114 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4115 NFT_MSG_NEWSET, GFP_KERNEL);
4116 nft_trans_destroy(trans);
4118 case NFT_MSG_DELSET:
4119 list_del_rcu(&nft_trans_set(trans)->list);
4120 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4121 NFT_MSG_DELSET, GFP_KERNEL);
4123 case NFT_MSG_NEWSETELEM:
4124 te = (struct nft_trans_elem *)trans->data;
4126 te->set->ops->activate(net, te->set, &te->elem);
4127 nf_tables_setelem_notify(&trans->ctx, te->set,
4129 NFT_MSG_NEWSETELEM, 0);
4130 nft_trans_destroy(trans);
4132 case NFT_MSG_DELSETELEM:
4133 te = (struct nft_trans_elem *)trans->data;
4135 nf_tables_setelem_notify(&trans->ctx, te->set,
4137 NFT_MSG_DELSETELEM, 0);
4138 te->set->ops->remove(te->set, &te->elem);
4139 atomic_dec(&te->set->nelems);
4147 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4148 list_del(&trans->list);
4149 nf_tables_commit_release(trans);
4152 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
4157 static void nf_tables_abort_release(struct nft_trans *trans)
4159 switch (trans->msg_type) {
4160 case NFT_MSG_NEWTABLE:
4161 nf_tables_table_destroy(&trans->ctx);
4163 case NFT_MSG_NEWCHAIN:
4164 nf_tables_chain_destroy(trans->ctx.chain);
4166 case NFT_MSG_NEWRULE:
4167 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4169 case NFT_MSG_NEWSET:
4170 nft_set_destroy(nft_trans_set(trans));
4172 case NFT_MSG_NEWSETELEM:
4173 nft_set_elem_destroy(nft_trans_elem_set(trans),
4174 nft_trans_elem(trans).priv);
4180 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
4182 struct nft_trans *trans, *next;
4183 struct nft_trans_elem *te;
4185 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4187 switch (trans->msg_type) {
4188 case NFT_MSG_NEWTABLE:
4189 if (nft_trans_table_update(trans)) {
4190 if (nft_trans_table_enable(trans)) {
4191 nf_tables_table_disable(net,
4194 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4196 nft_trans_destroy(trans);
4198 list_del_rcu(&trans->ctx.table->list);
4201 case NFT_MSG_DELTABLE:
4202 nft_clear(trans->ctx.net, trans->ctx.table);
4203 nft_trans_destroy(trans);
4205 case NFT_MSG_NEWCHAIN:
4206 if (nft_trans_chain_update(trans)) {
4207 free_percpu(nft_trans_chain_stats(trans));
4209 nft_trans_destroy(trans);
4211 trans->ctx.table->use--;
4212 list_del_rcu(&trans->ctx.chain->list);
4213 nf_tables_unregister_hooks(trans->ctx.net,
4216 trans->ctx.afi->nops);
4219 case NFT_MSG_DELCHAIN:
4220 trans->ctx.table->use++;
4221 nft_clear(trans->ctx.net, trans->ctx.chain);
4222 nft_trans_destroy(trans);
4224 case NFT_MSG_NEWRULE:
4225 trans->ctx.chain->use--;
4226 list_del_rcu(&nft_trans_rule(trans)->list);
4228 case NFT_MSG_DELRULE:
4229 trans->ctx.chain->use++;
4230 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4231 nft_trans_destroy(trans);
4233 case NFT_MSG_NEWSET:
4234 trans->ctx.table->use--;
4235 list_del_rcu(&nft_trans_set(trans)->list);
4237 case NFT_MSG_DELSET:
4238 trans->ctx.table->use++;
4239 nft_clear(trans->ctx.net, nft_trans_set(trans));
4240 nft_trans_destroy(trans);
4242 case NFT_MSG_NEWSETELEM:
4243 te = (struct nft_trans_elem *)trans->data;
4245 te->set->ops->remove(te->set, &te->elem);
4246 atomic_dec(&te->set->nelems);
4248 case NFT_MSG_DELSETELEM:
4249 te = (struct nft_trans_elem *)trans->data;
4251 te->set->ops->activate(net, te->set, &te->elem);
4254 nft_trans_destroy(trans);
4261 list_for_each_entry_safe_reverse(trans, next,
4262 &net->nft.commit_list, list) {
4263 list_del(&trans->list);
4264 nf_tables_abort_release(trans);
4270 static const struct nfnetlink_subsystem nf_tables_subsys = {
4271 .name = "nf_tables",
4272 .subsys_id = NFNL_SUBSYS_NFTABLES,
4273 .cb_count = NFT_MSG_MAX,
4275 .commit = nf_tables_commit,
4276 .abort = nf_tables_abort,
4279 int nft_chain_validate_dependency(const struct nft_chain *chain,
4280 enum nft_chain_type type)
4282 const struct nft_base_chain *basechain;
4284 if (chain->flags & NFT_BASE_CHAIN) {
4285 basechain = nft_base_chain(chain);
4286 if (basechain->type->type != type)
4291 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
4293 int nft_chain_validate_hooks(const struct nft_chain *chain,
4294 unsigned int hook_flags)
4296 struct nft_base_chain *basechain;
4298 if (chain->flags & NFT_BASE_CHAIN) {
4299 basechain = nft_base_chain(chain);
4301 if ((1 << basechain->ops[0].hooknum) & hook_flags)
4309 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
4312 * Loop detection - walk through the ruleset beginning at the destination chain
4313 * of a new jump until either the source chain is reached (loop) or all
4314 * reachable chains have been traversed.
4316 * The loop check is performed whenever a new jump verdict is added to an
4317 * expression or verdict map or a verdict map is bound to a new chain.
4320 static int nf_tables_check_loops(const struct nft_ctx *ctx,
4321 const struct nft_chain *chain);
4323 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
4324 const struct nft_set *set,
4325 const struct nft_set_iter *iter,
4326 const struct nft_set_elem *elem)
4328 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4329 const struct nft_data *data;
4331 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4332 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
4335 data = nft_set_ext_data(ext);
4336 switch (data->verdict.code) {
4339 return nf_tables_check_loops(ctx, data->verdict.chain);
4345 static int nf_tables_check_loops(const struct nft_ctx *ctx,
4346 const struct nft_chain *chain)
4348 const struct nft_rule *rule;
4349 const struct nft_expr *expr, *last;
4350 const struct nft_set *set;
4351 struct nft_set_binding *binding;
4352 struct nft_set_iter iter;
4354 if (ctx->chain == chain)
4357 list_for_each_entry(rule, &chain->rules, list) {
4358 nft_rule_for_each_expr(expr, last, rule) {
4359 const struct nft_data *data = NULL;
4362 if (!expr->ops->validate)
4365 err = expr->ops->validate(ctx, expr, &data);
4372 switch (data->verdict.code) {
4375 err = nf_tables_check_loops(ctx,
4376 data->verdict.chain);
4385 list_for_each_entry(set, &ctx->table->sets, list) {
4386 if (!nft_is_active_next(ctx->net, set))
4388 if (!(set->flags & NFT_SET_MAP) ||
4389 set->dtype != NFT_DATA_VERDICT)
4392 list_for_each_entry(binding, &set->bindings, list) {
4393 if (!(binding->flags & NFT_SET_MAP) ||
4394 binding->chain != chain)
4397 iter.genmask = nft_genmask_next(ctx->net);
4401 iter.fn = nf_tables_loop_check_setelem;
4403 set->ops->walk(ctx, set, &iter);
4413 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
4415 * @attr: netlink attribute to fetch value from
4416 * @max: maximum value to be stored in dest
4417 * @dest: pointer to the variable
4419 * Parse, check and store a given u32 netlink attribute into variable.
4420 * This function returns -ERANGE if the value goes over maximum value.
4421 * Otherwise a 0 is returned and the attribute value is stored in the
4422 * destination variable.
4424 unsigned int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
4428 val = ntohl(nla_get_be32(attr));
4435 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
4438 * nft_parse_register - parse a register value from a netlink attribute
4440 * @attr: netlink attribute
4442 * Parse and translate a register value from a netlink attribute.
4443 * Registers used to be 128 bit wide, these register numbers will be
4444 * mapped to the corresponding 32 bit register numbers.
4446 unsigned int nft_parse_register(const struct nlattr *attr)
4450 reg = ntohl(nla_get_be32(attr));
4452 case NFT_REG_VERDICT...NFT_REG_4:
4453 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
4455 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
4458 EXPORT_SYMBOL_GPL(nft_parse_register);
4461 * nft_dump_register - dump a register value to a netlink attribute
4463 * @skb: socket buffer
4464 * @attr: attribute number
4465 * @reg: register number
4467 * Construct a netlink attribute containing the register number. For
4468 * compatibility reasons, register numbers being a multiple of 4 are
4469 * translated to the corresponding 128 bit register numbers.
4471 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
4473 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
4474 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
4476 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
4478 return nla_put_be32(skb, attr, htonl(reg));
4480 EXPORT_SYMBOL_GPL(nft_dump_register);
4483 * nft_validate_register_load - validate a load from a register
4485 * @reg: the register number
4486 * @len: the length of the data
4488 * Validate that the input register is one of the general purpose
4489 * registers and that the length of the load is within the bounds.
4491 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
4493 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
4497 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
4502 EXPORT_SYMBOL_GPL(nft_validate_register_load);
4505 * nft_validate_register_store - validate an expressions' register store
4507 * @ctx: context of the expression performing the load
4508 * @reg: the destination register number
4509 * @data: the data to load
4510 * @type: the data type
4511 * @len: the length of the data
4513 * Validate that a data load uses the appropriate data type for
4514 * the destination register and the length is within the bounds.
4515 * A value of NULL for the data means that its runtime gathered
4518 int nft_validate_register_store(const struct nft_ctx *ctx,
4519 enum nft_registers reg,
4520 const struct nft_data *data,
4521 enum nft_data_types type, unsigned int len)
4526 case NFT_REG_VERDICT:
4527 if (type != NFT_DATA_VERDICT)
4531 (data->verdict.code == NFT_GOTO ||
4532 data->verdict.code == NFT_JUMP)) {
4533 err = nf_tables_check_loops(ctx, data->verdict.chain);
4537 if (ctx->chain->level + 1 >
4538 data->verdict.chain->level) {
4539 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
4541 data->verdict.chain->level = ctx->chain->level + 1;
4547 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
4551 if (reg * NFT_REG32_SIZE + len >
4552 FIELD_SIZEOF(struct nft_regs, data))
4555 if (data != NULL && type != NFT_DATA_VALUE)
4560 EXPORT_SYMBOL_GPL(nft_validate_register_store);
4562 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
4563 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
4564 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
4565 .len = NFT_CHAIN_MAXNAMELEN - 1 },
4568 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
4569 struct nft_data_desc *desc, const struct nlattr *nla)
4571 u8 genmask = nft_genmask_next(ctx->net);
4572 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
4573 struct nft_chain *chain;
4576 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
4580 if (!tb[NFTA_VERDICT_CODE])
4582 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
4584 switch (data->verdict.code) {
4586 switch (data->verdict.code & NF_VERDICT_MASK) {
4601 if (!tb[NFTA_VERDICT_CHAIN])
4603 chain = nf_tables_chain_lookup(ctx->table,
4604 tb[NFTA_VERDICT_CHAIN], genmask);
4606 return PTR_ERR(chain);
4607 if (chain->flags & NFT_BASE_CHAIN)
4611 data->verdict.chain = chain;
4615 desc->len = sizeof(data->verdict);
4616 desc->type = NFT_DATA_VERDICT;
4620 static void nft_verdict_uninit(const struct nft_data *data)
4622 switch (data->verdict.code) {
4625 data->verdict.chain->use--;
4630 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
4632 struct nlattr *nest;
4634 nest = nla_nest_start(skb, type);
4636 goto nla_put_failure;
4638 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
4639 goto nla_put_failure;
4644 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
4646 goto nla_put_failure;
4648 nla_nest_end(skb, nest);
4655 static int nft_value_init(const struct nft_ctx *ctx,
4656 struct nft_data *data, unsigned int size,
4657 struct nft_data_desc *desc, const struct nlattr *nla)
4667 nla_memcpy(data->data, nla, len);
4668 desc->type = NFT_DATA_VALUE;
4673 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
4676 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
4679 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
4680 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
4681 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
4685 * nft_data_init - parse nf_tables data netlink attributes
4687 * @ctx: context of the expression using the data
4688 * @data: destination struct nft_data
4689 * @size: maximum data length
4690 * @desc: data description
4691 * @nla: netlink attribute containing data
4693 * Parse the netlink data attributes and initialize a struct nft_data.
4694 * The type and length of data are returned in the data description.
4696 * The caller can indicate that it only wants to accept data of type
4697 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4699 int nft_data_init(const struct nft_ctx *ctx,
4700 struct nft_data *data, unsigned int size,
4701 struct nft_data_desc *desc, const struct nlattr *nla)
4703 struct nlattr *tb[NFTA_DATA_MAX + 1];
4706 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
4710 if (tb[NFTA_DATA_VALUE])
4711 return nft_value_init(ctx, data, size, desc,
4712 tb[NFTA_DATA_VALUE]);
4713 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
4714 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
4717 EXPORT_SYMBOL_GPL(nft_data_init);
4720 * nft_data_uninit - release a nft_data item
4722 * @data: struct nft_data to release
4723 * @type: type of data
4725 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4726 * all others need to be released by calling this function.
4728 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
4730 if (type < NFT_DATA_VERDICT)
4733 case NFT_DATA_VERDICT:
4734 return nft_verdict_uninit(data);
4739 EXPORT_SYMBOL_GPL(nft_data_uninit);
4741 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4742 enum nft_data_types type, unsigned int len)
4744 struct nlattr *nest;
4747 nest = nla_nest_start(skb, attr);
4752 case NFT_DATA_VALUE:
4753 err = nft_value_dump(skb, data, len);
4755 case NFT_DATA_VERDICT:
4756 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
4763 nla_nest_end(skb, nest);
4766 EXPORT_SYMBOL_GPL(nft_data_dump);
4768 static int __net_init nf_tables_init_net(struct net *net)
4770 INIT_LIST_HEAD(&net->nft.af_info);
4771 INIT_LIST_HEAD(&net->nft.commit_list);
4772 net->nft.base_seq = 1;
4776 int __nft_release_basechain(struct nft_ctx *ctx)
4778 struct nft_rule *rule, *nr;
4780 BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
4782 nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
4784 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
4785 list_del(&rule->list);
4787 nf_tables_rule_destroy(ctx, rule);
4789 list_del(&ctx->chain->list);
4791 nf_tables_chain_destroy(ctx->chain);
4795 EXPORT_SYMBOL_GPL(__nft_release_basechain);
4797 /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
4798 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
4800 struct nft_table *table, *nt;
4801 struct nft_chain *chain, *nc;
4802 struct nft_rule *rule, *nr;
4803 struct nft_set *set, *ns;
4804 struct nft_ctx ctx = {
4809 list_for_each_entry_safe(table, nt, &afi->tables, list) {
4810 list_for_each_entry(chain, &table->chains, list)
4811 nf_tables_unregister_hooks(net, table, chain,
4813 /* No packets are walking on these chains anymore. */
4815 list_for_each_entry(chain, &table->chains, list) {
4817 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
4818 list_del(&rule->list);
4820 nf_tables_rule_destroy(&ctx, rule);
4823 list_for_each_entry_safe(set, ns, &table->sets, list) {
4824 list_del(&set->list);
4826 nft_set_destroy(set);
4828 list_for_each_entry_safe(chain, nc, &table->chains, list) {
4829 list_del(&chain->list);
4831 nf_tables_chain_destroy(chain);
4833 list_del(&table->list);
4834 nf_tables_table_destroy(&ctx);
4838 static struct pernet_operations nf_tables_net_ops = {
4839 .init = nf_tables_init_net,
4842 static int __init nf_tables_module_init(void)
4846 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4853 err = nf_tables_core_module_init();
4857 err = nfnetlink_subsys_register(&nf_tables_subsys);
4861 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4862 return register_pernet_subsys(&nf_tables_net_ops);
4864 nf_tables_core_module_exit();
4871 static void __exit nf_tables_module_exit(void)
4873 unregister_pernet_subsys(&nf_tables_net_ops);
4874 nfnetlink_subsys_unregister(&nf_tables_subsys);
4876 nf_tables_core_module_exit();
4880 module_init(nf_tables_module_init);
4881 module_exit(nf_tables_module_exit);
4883 MODULE_LICENSE("GPL");
4884 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4885 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);