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 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1200 struct sk_buff *skb, const struct nlmsghdr *nlh,
1201 const struct nlattr * const nla[])
1203 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1204 const struct nlattr * uninitialized_var(name);
1205 struct nft_af_info *afi;
1206 struct nft_table *table;
1207 struct nft_chain *chain;
1208 struct nft_base_chain *basechain = NULL;
1209 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1210 u8 genmask = nft_genmask_next(net);
1211 int family = nfmsg->nfgen_family;
1212 struct net_device *dev = NULL;
1213 u8 policy = NF_ACCEPT;
1216 struct nft_stats __percpu *stats;
1221 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1223 afi = nf_tables_afinfo_lookup(net, family, true);
1225 return PTR_ERR(afi);
1227 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1229 return PTR_ERR(table);
1232 name = nla[NFTA_CHAIN_NAME];
1234 if (nla[NFTA_CHAIN_HANDLE]) {
1235 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1236 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
1238 return PTR_ERR(chain);
1240 chain = nf_tables_chain_lookup(table, name, genmask);
1241 if (IS_ERR(chain)) {
1242 if (PTR_ERR(chain) != -ENOENT)
1243 return PTR_ERR(chain);
1248 if (nla[NFTA_CHAIN_POLICY]) {
1249 if ((chain != NULL &&
1250 !(chain->flags & NFT_BASE_CHAIN)))
1253 if (chain == NULL &&
1254 nla[NFTA_CHAIN_HOOK] == NULL)
1257 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1267 if (chain != NULL) {
1268 struct nft_stats *stats = NULL;
1269 struct nft_trans *trans;
1271 if (nlh->nlmsg_flags & NLM_F_EXCL)
1273 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1276 if (nla[NFTA_CHAIN_HANDLE] && name) {
1277 struct nft_chain *chain2;
1279 chain2 = nf_tables_chain_lookup(table,
1280 nla[NFTA_CHAIN_NAME],
1283 return PTR_ERR(chain2);
1286 if (nla[NFTA_CHAIN_COUNTERS]) {
1287 if (!(chain->flags & NFT_BASE_CHAIN))
1290 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1292 return PTR_ERR(stats);
1295 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1296 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1297 sizeof(struct nft_trans_chain));
1298 if (trans == NULL) {
1303 nft_trans_chain_stats(trans) = stats;
1304 nft_trans_chain_update(trans) = true;
1306 if (nla[NFTA_CHAIN_POLICY])
1307 nft_trans_chain_policy(trans) = policy;
1309 nft_trans_chain_policy(trans) = -1;
1311 if (nla[NFTA_CHAIN_HANDLE] && name) {
1312 nla_strlcpy(nft_trans_chain_name(trans), name,
1313 NFT_CHAIN_MAXNAMELEN);
1315 list_add_tail(&trans->list, &net->nft.commit_list);
1319 if (table->use == UINT_MAX)
1322 if (nla[NFTA_CHAIN_HOOK]) {
1323 const struct nf_chain_type *type;
1324 struct nf_hook_ops *ops;
1326 u32 hooknum, priority;
1328 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1329 if (nla[NFTA_CHAIN_TYPE]) {
1330 type = nf_tables_chain_type_lookup(afi,
1331 nla[NFTA_CHAIN_TYPE],
1334 return PTR_ERR(type);
1337 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1341 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1342 ha[NFTA_HOOK_PRIORITY] == NULL)
1345 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1346 if (hooknum >= afi->nhooks)
1348 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1350 if (!(type->hook_mask & (1 << hooknum)))
1352 if (!try_module_get(type->owner))
1354 hookfn = type->hooks[hooknum];
1356 if (afi->flags & NFT_AF_NEEDS_DEV) {
1357 char ifname[IFNAMSIZ];
1359 if (!ha[NFTA_HOOK_DEV]) {
1360 module_put(type->owner);
1364 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1365 dev = dev_get_by_name(net, ifname);
1367 module_put(type->owner);
1370 } else if (ha[NFTA_HOOK_DEV]) {
1371 module_put(type->owner);
1375 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1376 if (basechain == NULL) {
1377 module_put(type->owner);
1384 strncpy(basechain->dev_name, dev->name, IFNAMSIZ);
1386 if (nla[NFTA_CHAIN_COUNTERS]) {
1387 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1388 if (IS_ERR(stats)) {
1389 module_put(type->owner);
1393 return PTR_ERR(stats);
1395 basechain->stats = stats;
1397 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1398 if (stats == NULL) {
1399 module_put(type->owner);
1405 rcu_assign_pointer(basechain->stats, stats);
1408 basechain->type = type;
1409 chain = &basechain->chain;
1411 for (i = 0; i < afi->nops; i++) {
1412 ops = &basechain->ops[i];
1414 ops->hooknum = hooknum;
1415 ops->priority = priority;
1417 ops->hook = afi->hooks[ops->hooknum];
1421 if (afi->hook_ops_init)
1422 afi->hook_ops_init(ops, i);
1425 chain->flags |= NFT_BASE_CHAIN;
1426 basechain->policy = policy;
1428 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1433 INIT_LIST_HEAD(&chain->rules);
1434 chain->handle = nf_tables_alloc_handle(table);
1435 chain->table = table;
1436 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1438 err = nf_tables_register_hooks(net, table, chain, afi->nops);
1442 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1443 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1448 list_add_tail_rcu(&chain->list, &table->chains);
1451 nf_tables_unregister_hooks(net, table, chain, afi->nops);
1453 nf_tables_chain_destroy(chain);
1457 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1458 struct sk_buff *skb, const struct nlmsghdr *nlh,
1459 const struct nlattr * const nla[])
1461 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1462 u8 genmask = nft_genmask_next(net);
1463 struct nft_af_info *afi;
1464 struct nft_table *table;
1465 struct nft_chain *chain;
1466 int family = nfmsg->nfgen_family;
1469 afi = nf_tables_afinfo_lookup(net, family, false);
1471 return PTR_ERR(afi);
1473 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1475 return PTR_ERR(table);
1477 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1479 return PTR_ERR(chain);
1483 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1485 return nft_delchain(&ctx);
1493 * nft_register_expr - register nf_tables expr type
1496 * Registers the expr type for use with nf_tables. Returns zero on
1497 * success or a negative errno code otherwise.
1499 int nft_register_expr(struct nft_expr_type *type)
1501 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1502 if (type->family == NFPROTO_UNSPEC)
1503 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1505 list_add_rcu(&type->list, &nf_tables_expressions);
1506 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1509 EXPORT_SYMBOL_GPL(nft_register_expr);
1512 * nft_unregister_expr - unregister nf_tables expr type
1515 * Unregisters the expr typefor use with nf_tables.
1517 void nft_unregister_expr(struct nft_expr_type *type)
1519 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1520 list_del_rcu(&type->list);
1521 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1523 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1525 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1528 const struct nft_expr_type *type;
1530 list_for_each_entry(type, &nf_tables_expressions, list) {
1531 if (!nla_strcmp(nla, type->name) &&
1532 (!type->family || type->family == family))
1538 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1541 const struct nft_expr_type *type;
1544 return ERR_PTR(-EINVAL);
1546 type = __nft_expr_type_get(family, nla);
1547 if (type != NULL && try_module_get(type->owner))
1550 #ifdef CONFIG_MODULES
1552 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1553 request_module("nft-expr-%u-%.*s", family,
1554 nla_len(nla), (char *)nla_data(nla));
1555 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1556 if (__nft_expr_type_get(family, nla))
1557 return ERR_PTR(-EAGAIN);
1559 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1560 request_module("nft-expr-%.*s",
1561 nla_len(nla), (char *)nla_data(nla));
1562 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1563 if (__nft_expr_type_get(family, nla))
1564 return ERR_PTR(-EAGAIN);
1567 return ERR_PTR(-ENOENT);
1570 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1571 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1572 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1575 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1576 const struct nft_expr *expr)
1578 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1579 goto nla_put_failure;
1581 if (expr->ops->dump) {
1582 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1584 goto nla_put_failure;
1585 if (expr->ops->dump(skb, expr) < 0)
1586 goto nla_put_failure;
1587 nla_nest_end(skb, data);
1596 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1597 const struct nft_expr *expr)
1599 struct nlattr *nest;
1601 nest = nla_nest_start(skb, attr);
1603 goto nla_put_failure;
1604 if (nf_tables_fill_expr_info(skb, expr) < 0)
1605 goto nla_put_failure;
1606 nla_nest_end(skb, nest);
1613 struct nft_expr_info {
1614 const struct nft_expr_ops *ops;
1615 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1618 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1619 const struct nlattr *nla,
1620 struct nft_expr_info *info)
1622 const struct nft_expr_type *type;
1623 const struct nft_expr_ops *ops;
1624 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1627 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1631 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1633 return PTR_ERR(type);
1635 if (tb[NFTA_EXPR_DATA]) {
1636 err = nla_parse_nested(info->tb, type->maxattr,
1637 tb[NFTA_EXPR_DATA], type->policy);
1641 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1643 if (type->select_ops != NULL) {
1644 ops = type->select_ops(ctx,
1645 (const struct nlattr * const *)info->tb);
1657 module_put(type->owner);
1661 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1662 const struct nft_expr_info *info,
1663 struct nft_expr *expr)
1665 const struct nft_expr_ops *ops = info->ops;
1670 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1682 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1683 struct nft_expr *expr)
1685 if (expr->ops->destroy)
1686 expr->ops->destroy(ctx, expr);
1687 module_put(expr->ops->type->owner);
1690 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1691 const struct nlattr *nla)
1693 struct nft_expr_info info;
1694 struct nft_expr *expr;
1697 err = nf_tables_expr_parse(ctx, nla, &info);
1702 expr = kzalloc(info.ops->size, GFP_KERNEL);
1706 err = nf_tables_newexpr(ctx, &info, expr);
1714 module_put(info.ops->type->owner);
1716 return ERR_PTR(err);
1719 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1721 nf_tables_expr_destroy(ctx, expr);
1729 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1732 struct nft_rule *rule;
1734 // FIXME: this sucks
1735 list_for_each_entry(rule, &chain->rules, list) {
1736 if (handle == rule->handle)
1740 return ERR_PTR(-ENOENT);
1743 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1744 const struct nlattr *nla)
1747 return ERR_PTR(-EINVAL);
1749 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1752 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1753 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1754 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1755 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1756 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1757 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1758 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1759 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1760 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1761 .len = NFT_USERDATA_MAXLEN },
1764 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1765 u32 portid, u32 seq, int event,
1766 u32 flags, int family,
1767 const struct nft_table *table,
1768 const struct nft_chain *chain,
1769 const struct nft_rule *rule)
1771 struct nlmsghdr *nlh;
1772 struct nfgenmsg *nfmsg;
1773 const struct nft_expr *expr, *next;
1774 struct nlattr *list;
1775 const struct nft_rule *prule;
1776 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1778 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1781 goto nla_put_failure;
1783 nfmsg = nlmsg_data(nlh);
1784 nfmsg->nfgen_family = family;
1785 nfmsg->version = NFNETLINK_V0;
1786 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1788 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1789 goto nla_put_failure;
1790 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1791 goto nla_put_failure;
1792 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1794 goto nla_put_failure;
1796 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1797 prule = list_entry(rule->list.prev, struct nft_rule, list);
1798 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1799 cpu_to_be64(prule->handle),
1801 goto nla_put_failure;
1804 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1806 goto nla_put_failure;
1807 nft_rule_for_each_expr(expr, next, rule) {
1808 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
1809 goto nla_put_failure;
1811 nla_nest_end(skb, list);
1814 struct nft_userdata *udata = nft_userdata(rule);
1815 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1817 goto nla_put_failure;
1820 nlmsg_end(skb, nlh);
1824 nlmsg_trim(skb, nlh);
1828 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1829 const struct nft_rule *rule,
1832 struct sk_buff *skb;
1836 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1840 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1844 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1845 event, 0, ctx->afi->family, ctx->table,
1852 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1853 ctx->report, GFP_KERNEL);
1856 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1862 struct nft_rule_dump_ctx {
1863 char table[NFT_TABLE_MAXNAMELEN];
1864 char chain[NFT_CHAIN_MAXNAMELEN];
1867 static int nf_tables_dump_rules(struct sk_buff *skb,
1868 struct netlink_callback *cb)
1870 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1871 const struct nft_rule_dump_ctx *ctx = cb->data;
1872 const struct nft_af_info *afi;
1873 const struct nft_table *table;
1874 const struct nft_chain *chain;
1875 const struct nft_rule *rule;
1876 unsigned int idx = 0, s_idx = cb->args[0];
1877 struct net *net = sock_net(skb->sk);
1878 int family = nfmsg->nfgen_family;
1881 cb->seq = net->nft.base_seq;
1883 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1884 if (family != NFPROTO_UNSPEC && family != afi->family)
1887 list_for_each_entry_rcu(table, &afi->tables, list) {
1888 if (ctx && ctx->table[0] &&
1889 strcmp(ctx->table, table->name) != 0)
1892 list_for_each_entry_rcu(chain, &table->chains, list) {
1893 if (ctx && ctx->chain[0] &&
1894 strcmp(ctx->chain, chain->name) != 0)
1897 list_for_each_entry_rcu(rule, &chain->rules, list) {
1898 if (!nft_is_active(net, rule))
1903 memset(&cb->args[1], 0,
1904 sizeof(cb->args) - sizeof(cb->args[0]));
1905 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
1908 NLM_F_MULTI | NLM_F_APPEND,
1909 afi->family, table, chain, rule) < 0)
1912 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1926 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
1932 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
1933 struct sk_buff *skb, const struct nlmsghdr *nlh,
1934 const struct nlattr * const nla[])
1936 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1937 u8 genmask = nft_genmask_cur(net);
1938 const struct nft_af_info *afi;
1939 const struct nft_table *table;
1940 const struct nft_chain *chain;
1941 const struct nft_rule *rule;
1942 struct sk_buff *skb2;
1943 int family = nfmsg->nfgen_family;
1946 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1947 struct netlink_dump_control c = {
1948 .dump = nf_tables_dump_rules,
1949 .done = nf_tables_dump_rules_done,
1952 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
1953 struct nft_rule_dump_ctx *ctx;
1955 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
1959 if (nla[NFTA_RULE_TABLE])
1960 nla_strlcpy(ctx->table, nla[NFTA_RULE_TABLE],
1961 sizeof(ctx->table));
1962 if (nla[NFTA_RULE_CHAIN])
1963 nla_strlcpy(ctx->chain, nla[NFTA_RULE_CHAIN],
1964 sizeof(ctx->chain));
1968 return netlink_dump_start(nlsk, skb, nlh, &c);
1971 afi = nf_tables_afinfo_lookup(net, family, false);
1973 return PTR_ERR(afi);
1975 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
1977 return PTR_ERR(table);
1979 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
1981 return PTR_ERR(chain);
1983 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1985 return PTR_ERR(rule);
1987 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1991 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
1992 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1993 family, table, chain, rule);
1997 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2004 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2005 struct nft_rule *rule)
2007 struct nft_expr *expr;
2010 * Careful: some expressions might not be initialized in case this
2011 * is called on error from nf_tables_newrule().
2013 expr = nft_expr_first(rule);
2014 while (expr->ops && expr != nft_expr_last(rule)) {
2015 nf_tables_expr_destroy(ctx, expr);
2016 expr = nft_expr_next(expr);
2021 #define NFT_RULE_MAXEXPRS 128
2023 static struct nft_expr_info *info;
2025 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2026 struct sk_buff *skb, const struct nlmsghdr *nlh,
2027 const struct nlattr * const nla[])
2029 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2030 u8 genmask = nft_genmask_next(net);
2031 struct nft_af_info *afi;
2032 struct nft_table *table;
2033 struct nft_chain *chain;
2034 struct nft_rule *rule, *old_rule = NULL;
2035 struct nft_userdata *udata;
2036 struct nft_trans *trans = NULL;
2037 struct nft_expr *expr;
2040 unsigned int size, i, n, ulen = 0, usize = 0;
2043 u64 handle, pos_handle;
2045 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2047 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2049 return PTR_ERR(afi);
2051 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2053 return PTR_ERR(table);
2055 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2057 return PTR_ERR(chain);
2059 if (nla[NFTA_RULE_HANDLE]) {
2060 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2061 rule = __nf_tables_rule_lookup(chain, handle);
2063 return PTR_ERR(rule);
2065 if (nlh->nlmsg_flags & NLM_F_EXCL)
2067 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2072 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2074 handle = nf_tables_alloc_handle(table);
2076 if (chain->use == UINT_MAX)
2080 if (nla[NFTA_RULE_POSITION]) {
2081 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2084 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2085 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2086 if (IS_ERR(old_rule))
2087 return PTR_ERR(old_rule);
2090 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2094 if (nla[NFTA_RULE_EXPRESSIONS]) {
2095 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2097 if (nla_type(tmp) != NFTA_LIST_ELEM)
2099 if (n == NFT_RULE_MAXEXPRS)
2101 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2104 size += info[n].ops->size;
2108 /* Check for overflow of dlen field */
2110 if (size >= 1 << 12)
2113 if (nla[NFTA_RULE_USERDATA]) {
2114 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2116 usize = sizeof(struct nft_userdata) + ulen;
2120 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2124 nft_activate_next(net, rule);
2126 rule->handle = handle;
2128 rule->udata = ulen ? 1 : 0;
2131 udata = nft_userdata(rule);
2132 udata->len = ulen - 1;
2133 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2136 expr = nft_expr_first(rule);
2137 for (i = 0; i < n; i++) {
2138 err = nf_tables_newexpr(&ctx, &info[i], expr);
2142 expr = nft_expr_next(expr);
2145 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2146 if (nft_is_active_next(net, old_rule)) {
2147 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2149 if (trans == NULL) {
2153 nft_deactivate_next(net, old_rule);
2155 list_add_tail_rcu(&rule->list, &old_rule->list);
2160 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2162 list_add_rcu(&rule->list, &old_rule->list);
2164 list_add_tail_rcu(&rule->list, &chain->rules);
2167 list_add_tail_rcu(&rule->list, &old_rule->list);
2169 list_add_rcu(&rule->list, &chain->rules);
2172 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2180 list_del_rcu(&rule->list);
2182 nf_tables_rule_destroy(&ctx, rule);
2184 for (i = 0; i < n; i++) {
2185 if (info[i].ops != NULL)
2186 module_put(info[i].ops->type->owner);
2191 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2192 struct sk_buff *skb, const struct nlmsghdr *nlh,
2193 const struct nlattr * const nla[])
2195 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2196 u8 genmask = nft_genmask_next(net);
2197 struct nft_af_info *afi;
2198 struct nft_table *table;
2199 struct nft_chain *chain = NULL;
2200 struct nft_rule *rule;
2201 int family = nfmsg->nfgen_family, err = 0;
2204 afi = nf_tables_afinfo_lookup(net, family, false);
2206 return PTR_ERR(afi);
2208 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2210 return PTR_ERR(table);
2212 if (nla[NFTA_RULE_CHAIN]) {
2213 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2216 return PTR_ERR(chain);
2219 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2222 if (nla[NFTA_RULE_HANDLE]) {
2223 rule = nf_tables_rule_lookup(chain,
2224 nla[NFTA_RULE_HANDLE]);
2226 return PTR_ERR(rule);
2228 err = nft_delrule(&ctx, rule);
2230 err = nft_delrule_by_chain(&ctx);
2233 list_for_each_entry(chain, &table->chains, list) {
2234 if (!nft_is_active_next(net, chain))
2238 err = nft_delrule_by_chain(&ctx);
2251 static LIST_HEAD(nf_tables_set_ops);
2253 int nft_register_set(struct nft_set_ops *ops)
2255 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2256 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2257 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2260 EXPORT_SYMBOL_GPL(nft_register_set);
2262 void nft_unregister_set(struct nft_set_ops *ops)
2264 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2265 list_del_rcu(&ops->list);
2266 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2268 EXPORT_SYMBOL_GPL(nft_unregister_set);
2271 * Select a set implementation based on the data characteristics and the
2272 * given policy. The total memory use might not be known if no size is
2273 * given, in that case the amount of memory per element is used.
2275 static const struct nft_set_ops *
2276 nft_select_set_ops(const struct nlattr * const nla[],
2277 const struct nft_set_desc *desc,
2278 enum nft_set_policies policy)
2280 const struct nft_set_ops *ops, *bops;
2281 struct nft_set_estimate est, best;
2284 #ifdef CONFIG_MODULES
2285 if (list_empty(&nf_tables_set_ops)) {
2286 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2287 request_module("nft-set");
2288 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2289 if (!list_empty(&nf_tables_set_ops))
2290 return ERR_PTR(-EAGAIN);
2294 if (nla[NFTA_SET_FLAGS] != NULL) {
2295 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2296 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT;
2303 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2304 if ((ops->features & features) != features)
2306 if (!ops->estimate(desc, features, &est))
2310 case NFT_SET_POL_PERFORMANCE:
2311 if (est.class < best.class)
2313 if (est.class == best.class && est.size < best.size)
2316 case NFT_SET_POL_MEMORY:
2317 if (est.size < best.size)
2319 if (est.size == best.size && est.class < best.class)
2326 if (!try_module_get(ops->owner))
2329 module_put(bops->owner);
2338 return ERR_PTR(-EOPNOTSUPP);
2341 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2342 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2343 [NFTA_SET_NAME] = { .type = NLA_STRING,
2344 .len = NFT_SET_MAXNAMELEN - 1 },
2345 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2346 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2347 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2348 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2349 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2350 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2351 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2352 [NFTA_SET_ID] = { .type = NLA_U32 },
2353 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2354 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2355 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2356 .len = NFT_USERDATA_MAXLEN },
2359 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2360 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2363 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2364 const struct sk_buff *skb,
2365 const struct nlmsghdr *nlh,
2366 const struct nlattr * const nla[],
2369 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2370 struct nft_af_info *afi = NULL;
2371 struct nft_table *table = NULL;
2373 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2374 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2376 return PTR_ERR(afi);
2379 if (nla[NFTA_SET_TABLE] != NULL) {
2381 return -EAFNOSUPPORT;
2383 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2386 return PTR_ERR(table);
2389 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
2393 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2394 const struct nlattr *nla, u8 genmask)
2396 struct nft_set *set;
2399 return ERR_PTR(-EINVAL);
2401 list_for_each_entry(set, &table->sets, list) {
2402 if (!nla_strcmp(nla, set->name) &&
2403 nft_active_genmask(set, genmask))
2406 return ERR_PTR(-ENOENT);
2409 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2410 const struct nlattr *nla,
2413 struct nft_trans *trans;
2414 u32 id = ntohl(nla_get_be32(nla));
2416 list_for_each_entry(trans, &net->nft.commit_list, list) {
2417 struct nft_set *set = nft_trans_set(trans);
2419 if (trans->msg_type == NFT_MSG_NEWSET &&
2420 id == nft_trans_set_id(trans) &&
2421 nft_active_genmask(set, genmask))
2424 return ERR_PTR(-ENOENT);
2427 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2430 const struct nft_set *i;
2432 unsigned long *inuse;
2433 unsigned int n = 0, min = 0;
2435 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
2437 if (p[1] != 'd' || strchr(p + 2, '%'))
2440 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2444 list_for_each_entry(i, &ctx->table->sets, list) {
2447 if (!nft_is_active_next(ctx->net, set))
2449 if (!sscanf(i->name, name, &tmp))
2451 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2454 set_bit(tmp - min, inuse);
2457 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2458 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2459 min += BITS_PER_BYTE * PAGE_SIZE;
2460 memset(inuse, 0, PAGE_SIZE);
2463 free_page((unsigned long)inuse);
2466 snprintf(set->name, sizeof(set->name), name, min + n);
2467 list_for_each_entry(i, &ctx->table->sets, list) {
2468 if (!nft_is_active_next(ctx->net, i))
2470 if (!strcmp(set->name, i->name))
2476 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2477 const struct nft_set *set, u16 event, u16 flags)
2479 struct nfgenmsg *nfmsg;
2480 struct nlmsghdr *nlh;
2481 struct nlattr *desc;
2482 u32 portid = ctx->portid;
2485 event |= NFNL_SUBSYS_NFTABLES << 8;
2486 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2489 goto nla_put_failure;
2491 nfmsg = nlmsg_data(nlh);
2492 nfmsg->nfgen_family = ctx->afi->family;
2493 nfmsg->version = NFNETLINK_V0;
2494 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2496 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2497 goto nla_put_failure;
2498 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2499 goto nla_put_failure;
2500 if (set->flags != 0)
2501 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2502 goto nla_put_failure;
2504 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2505 goto nla_put_failure;
2506 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2507 goto nla_put_failure;
2508 if (set->flags & NFT_SET_MAP) {
2509 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2510 goto nla_put_failure;
2511 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2512 goto nla_put_failure;
2516 nla_put_be64(skb, NFTA_SET_TIMEOUT, cpu_to_be64(set->timeout),
2518 goto nla_put_failure;
2520 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2521 goto nla_put_failure;
2523 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2524 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2525 goto nla_put_failure;
2528 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2529 goto nla_put_failure;
2531 desc = nla_nest_start(skb, NFTA_SET_DESC);
2533 goto nla_put_failure;
2535 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2536 goto nla_put_failure;
2537 nla_nest_end(skb, desc);
2539 nlmsg_end(skb, nlh);
2543 nlmsg_trim(skb, nlh);
2547 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2548 const struct nft_set *set,
2549 int event, gfp_t gfp_flags)
2551 struct sk_buff *skb;
2552 u32 portid = ctx->portid;
2556 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2560 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2564 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2570 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2571 ctx->report, gfp_flags);
2574 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2578 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2580 const struct nft_set *set;
2581 unsigned int idx, s_idx = cb->args[0];
2582 struct nft_af_info *afi;
2583 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2584 struct net *net = sock_net(skb->sk);
2585 int cur_family = cb->args[3];
2586 struct nft_ctx *ctx = cb->data, ctx_set;
2592 cb->seq = net->nft.base_seq;
2594 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2595 if (ctx->afi && ctx->afi != afi)
2599 if (afi->family != cur_family)
2604 list_for_each_entry_rcu(table, &afi->tables, list) {
2605 if (ctx->table && ctx->table != table)
2609 if (cur_table != table)
2615 list_for_each_entry_rcu(set, &table->sets, list) {
2618 if (!nft_is_active(net, set))
2622 ctx_set.table = table;
2624 if (nf_tables_fill_set(skb, &ctx_set, set,
2628 cb->args[2] = (unsigned long) table;
2629 cb->args[3] = afi->family;
2632 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2646 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2652 static int nf_tables_getset(struct net *net, struct sock *nlsk,
2653 struct sk_buff *skb, const struct nlmsghdr *nlh,
2654 const struct nlattr * const nla[])
2656 u8 genmask = nft_genmask_cur(net);
2657 const struct nft_set *set;
2659 struct sk_buff *skb2;
2660 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2663 /* Verify existence before starting dump */
2664 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
2668 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2669 struct netlink_dump_control c = {
2670 .dump = nf_tables_dump_sets,
2671 .done = nf_tables_dump_sets_done,
2673 struct nft_ctx *ctx_dump;
2675 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2676 if (ctx_dump == NULL)
2682 return netlink_dump_start(nlsk, skb, nlh, &c);
2685 /* Only accept unspec with dump */
2686 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2687 return -EAFNOSUPPORT;
2688 if (!nla[NFTA_SET_TABLE])
2691 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
2693 return PTR_ERR(set);
2695 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2699 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2703 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2710 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2711 struct nft_set_desc *desc,
2712 const struct nlattr *nla)
2714 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2717 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2721 if (da[NFTA_SET_DESC_SIZE] != NULL)
2722 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2727 static int nf_tables_newset(struct net *net, struct sock *nlsk,
2728 struct sk_buff *skb, const struct nlmsghdr *nlh,
2729 const struct nlattr * const nla[])
2731 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2732 u8 genmask = nft_genmask_next(net);
2733 const struct nft_set_ops *ops;
2734 struct nft_af_info *afi;
2735 struct nft_table *table;
2736 struct nft_set *set;
2738 char name[NFT_SET_MAXNAMELEN];
2742 u32 ktype, dtype, flags, policy, gc_int;
2743 struct nft_set_desc desc;
2744 unsigned char *udata;
2748 if (nla[NFTA_SET_TABLE] == NULL ||
2749 nla[NFTA_SET_NAME] == NULL ||
2750 nla[NFTA_SET_KEY_LEN] == NULL ||
2751 nla[NFTA_SET_ID] == NULL)
2754 memset(&desc, 0, sizeof(desc));
2756 ktype = NFT_DATA_VALUE;
2757 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2758 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2759 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2763 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2764 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
2768 if (nla[NFTA_SET_FLAGS] != NULL) {
2769 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2770 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2771 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2772 NFT_SET_MAP | NFT_SET_EVAL))
2774 /* Only one of both operations is supported */
2775 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL)) ==
2776 (NFT_SET_MAP | NFT_SET_EVAL))
2781 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2782 if (!(flags & NFT_SET_MAP))
2785 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2786 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2787 dtype != NFT_DATA_VERDICT)
2790 if (dtype != NFT_DATA_VERDICT) {
2791 if (nla[NFTA_SET_DATA_LEN] == NULL)
2793 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2794 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
2797 desc.dlen = sizeof(struct nft_verdict);
2798 } else if (flags & NFT_SET_MAP)
2802 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2803 if (!(flags & NFT_SET_TIMEOUT))
2805 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_TIMEOUT]));
2808 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2809 if (!(flags & NFT_SET_TIMEOUT))
2811 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2814 policy = NFT_SET_POL_PERFORMANCE;
2815 if (nla[NFTA_SET_POLICY] != NULL)
2816 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2818 if (nla[NFTA_SET_DESC] != NULL) {
2819 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2824 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2826 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2828 return PTR_ERR(afi);
2830 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
2832 return PTR_ERR(table);
2834 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
2836 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
2838 if (PTR_ERR(set) != -ENOENT)
2839 return PTR_ERR(set);
2844 if (nlh->nlmsg_flags & NLM_F_EXCL)
2846 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2851 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2854 ops = nft_select_set_ops(nla, &desc, policy);
2856 return PTR_ERR(ops);
2859 if (nla[NFTA_SET_USERDATA])
2860 udlen = nla_len(nla[NFTA_SET_USERDATA]);
2863 if (ops->privsize != NULL)
2864 size = ops->privsize(nla);
2867 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
2871 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2872 err = nf_tables_set_alloc_name(&ctx, set, name);
2878 udata = set->data + size;
2879 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
2882 INIT_LIST_HEAD(&set->bindings);
2885 set->klen = desc.klen;
2887 set->dlen = desc.dlen;
2889 set->size = desc.size;
2890 set->policy = policy;
2893 set->timeout = timeout;
2894 set->gc_int = gc_int;
2896 err = ops->init(set, &desc, nla);
2900 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2904 list_add_tail_rcu(&set->list, &table->sets);
2911 module_put(ops->owner);
2915 static void nft_set_destroy(struct nft_set *set)
2917 set->ops->destroy(set);
2918 module_put(set->ops->owner);
2922 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2924 list_del_rcu(&set->list);
2925 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
2926 nft_set_destroy(set);
2929 static int nf_tables_delset(struct net *net, struct sock *nlsk,
2930 struct sk_buff *skb, const struct nlmsghdr *nlh,
2931 const struct nlattr * const nla[])
2933 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2934 u8 genmask = nft_genmask_next(net);
2935 struct nft_set *set;
2939 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2940 return -EAFNOSUPPORT;
2941 if (nla[NFTA_SET_TABLE] == NULL)
2944 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
2948 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
2950 return PTR_ERR(set);
2951 if (!list_empty(&set->bindings))
2954 return nft_delset(&ctx, set);
2957 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2958 const struct nft_set *set,
2959 const struct nft_set_iter *iter,
2960 const struct nft_set_elem *elem)
2962 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
2963 enum nft_registers dreg;
2965 dreg = nft_type_to_reg(set->dtype);
2966 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
2967 set->dtype == NFT_DATA_VERDICT ?
2968 NFT_DATA_VERDICT : NFT_DATA_VALUE,
2972 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2973 struct nft_set_binding *binding)
2975 struct nft_set_binding *i;
2976 struct nft_set_iter iter;
2978 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2981 if (binding->flags & NFT_SET_MAP) {
2982 /* If the set is already bound to the same chain all
2983 * jumps are already validated for that chain.
2985 list_for_each_entry(i, &set->bindings, list) {
2986 if (i->flags & NFT_SET_MAP &&
2987 i->chain == binding->chain)
2991 iter.genmask = nft_genmask_next(ctx->net);
2995 iter.fn = nf_tables_bind_check_setelem;
2997 set->ops->walk(ctx, set, &iter);
3002 binding->chain = ctx->chain;
3003 list_add_tail_rcu(&binding->list, &set->bindings);
3007 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3008 struct nft_set_binding *binding)
3010 list_del_rcu(&binding->list);
3012 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
3013 nft_is_active(ctx->net, set))
3014 nf_tables_set_destroy(ctx, set);
3017 const struct nft_set_ext_type nft_set_ext_types[] = {
3018 [NFT_SET_EXT_KEY] = {
3019 .align = __alignof__(u32),
3021 [NFT_SET_EXT_DATA] = {
3022 .align = __alignof__(u32),
3024 [NFT_SET_EXT_EXPR] = {
3025 .align = __alignof__(struct nft_expr),
3027 [NFT_SET_EXT_FLAGS] = {
3029 .align = __alignof__(u8),
3031 [NFT_SET_EXT_TIMEOUT] = {
3033 .align = __alignof__(u64),
3035 [NFT_SET_EXT_EXPIRATION] = {
3036 .len = sizeof(unsigned long),
3037 .align = __alignof__(unsigned long),
3039 [NFT_SET_EXT_USERDATA] = {
3040 .len = sizeof(struct nft_userdata),
3041 .align = __alignof__(struct nft_userdata),
3044 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3050 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3051 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3052 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3053 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3054 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3055 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3056 .len = NFT_USERDATA_MAXLEN },
3059 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3060 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
3061 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
3062 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3063 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3066 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3067 const struct sk_buff *skb,
3068 const struct nlmsghdr *nlh,
3069 const struct nlattr * const nla[],
3072 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3073 struct nft_af_info *afi;
3074 struct nft_table *table;
3076 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3078 return PTR_ERR(afi);
3080 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3083 return PTR_ERR(table);
3085 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
3089 static int nf_tables_fill_setelem(struct sk_buff *skb,
3090 const struct nft_set *set,
3091 const struct nft_set_elem *elem)
3093 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3094 unsigned char *b = skb_tail_pointer(skb);
3095 struct nlattr *nest;
3097 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3099 goto nla_put_failure;
3101 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3102 NFT_DATA_VALUE, set->klen) < 0)
3103 goto nla_put_failure;
3105 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3106 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3107 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3109 goto nla_put_failure;
3111 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3112 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3113 goto nla_put_failure;
3115 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3116 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3117 htonl(*nft_set_ext_flags(ext))))
3118 goto nla_put_failure;
3120 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3121 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3122 cpu_to_be64(*nft_set_ext_timeout(ext)),
3124 goto nla_put_failure;
3126 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3127 unsigned long expires, now = jiffies;
3129 expires = *nft_set_ext_expiration(ext);
3130 if (time_before(now, expires))
3135 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3136 cpu_to_be64(jiffies_to_msecs(expires)),
3138 goto nla_put_failure;
3141 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3142 struct nft_userdata *udata;
3144 udata = nft_set_ext_userdata(ext);
3145 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3146 udata->len + 1, udata->data))
3147 goto nla_put_failure;
3150 nla_nest_end(skb, nest);
3158 struct nft_set_dump_args {
3159 const struct netlink_callback *cb;
3160 struct nft_set_iter iter;
3161 struct sk_buff *skb;
3164 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3165 const struct nft_set *set,
3166 const struct nft_set_iter *iter,
3167 const struct nft_set_elem *elem)
3169 struct nft_set_dump_args *args;
3171 args = container_of(iter, struct nft_set_dump_args, iter);
3172 return nf_tables_fill_setelem(args->skb, set, elem);
3175 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3177 struct net *net = sock_net(skb->sk);
3178 u8 genmask = nft_genmask_cur(net);
3179 const struct nft_set *set;
3180 struct nft_set_dump_args args;
3182 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3183 struct nfgenmsg *nfmsg;
3184 struct nlmsghdr *nlh;
3185 struct nlattr *nest;
3189 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3190 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
3194 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
3195 (void *)nla, genmask);
3199 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3202 return PTR_ERR(set);
3204 event = NFT_MSG_NEWSETELEM;
3205 event |= NFNL_SUBSYS_NFTABLES << 8;
3206 portid = NETLINK_CB(cb->skb).portid;
3207 seq = cb->nlh->nlmsg_seq;
3209 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3212 goto nla_put_failure;
3214 nfmsg = nlmsg_data(nlh);
3215 nfmsg->nfgen_family = ctx.afi->family;
3216 nfmsg->version = NFNETLINK_V0;
3217 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
3219 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3220 goto nla_put_failure;
3221 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3222 goto nla_put_failure;
3224 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3226 goto nla_put_failure;
3230 args.iter.genmask = nft_genmask_cur(ctx.net);
3231 args.iter.skip = cb->args[0];
3232 args.iter.count = 0;
3234 args.iter.fn = nf_tables_dump_setelem;
3235 set->ops->walk(&ctx, set, &args.iter);
3237 nla_nest_end(skb, nest);
3238 nlmsg_end(skb, nlh);
3240 if (args.iter.err && args.iter.err != -EMSGSIZE)
3241 return args.iter.err;
3242 if (args.iter.count == cb->args[0])
3245 cb->args[0] = args.iter.count;
3252 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3253 struct sk_buff *skb, const struct nlmsghdr *nlh,
3254 const struct nlattr * const nla[])
3256 u8 genmask = nft_genmask_cur(net);
3257 const struct nft_set *set;
3261 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3265 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3268 return PTR_ERR(set);
3270 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3271 struct netlink_dump_control c = {
3272 .dump = nf_tables_dump_set,
3274 return netlink_dump_start(nlsk, skb, nlh, &c);
3279 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3280 const struct nft_ctx *ctx, u32 seq,
3281 u32 portid, int event, u16 flags,
3282 const struct nft_set *set,
3283 const struct nft_set_elem *elem)
3285 struct nfgenmsg *nfmsg;
3286 struct nlmsghdr *nlh;
3287 struct nlattr *nest;
3290 event |= NFNL_SUBSYS_NFTABLES << 8;
3291 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3294 goto nla_put_failure;
3296 nfmsg = nlmsg_data(nlh);
3297 nfmsg->nfgen_family = ctx->afi->family;
3298 nfmsg->version = NFNETLINK_V0;
3299 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3301 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3302 goto nla_put_failure;
3303 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3304 goto nla_put_failure;
3306 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3308 goto nla_put_failure;
3310 err = nf_tables_fill_setelem(skb, set, elem);
3312 goto nla_put_failure;
3314 nla_nest_end(skb, nest);
3316 nlmsg_end(skb, nlh);
3320 nlmsg_trim(skb, nlh);
3324 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3325 const struct nft_set *set,
3326 const struct nft_set_elem *elem,
3327 int event, u16 flags)
3329 struct net *net = ctx->net;
3330 u32 portid = ctx->portid;
3331 struct sk_buff *skb;
3334 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3338 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3342 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3349 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3353 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3357 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3359 struct nft_set *set)
3361 struct nft_trans *trans;
3363 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3367 nft_trans_elem_set(trans) = set;
3371 void *nft_set_elem_init(const struct nft_set *set,
3372 const struct nft_set_ext_tmpl *tmpl,
3373 const u32 *key, const u32 *data,
3374 u64 timeout, gfp_t gfp)
3376 struct nft_set_ext *ext;
3379 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3383 ext = nft_set_elem_ext(set, elem);
3384 nft_set_ext_init(ext, tmpl);
3386 memcpy(nft_set_ext_key(ext), key, set->klen);
3387 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3388 memcpy(nft_set_ext_data(ext), data, set->dlen);
3389 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3390 *nft_set_ext_expiration(ext) =
3391 jiffies + msecs_to_jiffies(timeout);
3392 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3393 *nft_set_ext_timeout(ext) = timeout;
3398 void nft_set_elem_destroy(const struct nft_set *set, void *elem)
3400 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3402 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3403 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3404 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
3405 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3406 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3410 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3412 static int nft_setelem_parse_flags(const struct nft_set *set,
3413 const struct nlattr *attr, u32 *flags)
3418 *flags = ntohl(nla_get_be32(attr));
3419 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3421 if (!(set->flags & NFT_SET_INTERVAL) &&
3422 *flags & NFT_SET_ELEM_INTERVAL_END)
3428 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3429 const struct nlattr *attr)
3431 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3432 struct nft_data_desc d1, d2;
3433 struct nft_set_ext_tmpl tmpl;
3434 struct nft_set_ext *ext;
3435 struct nft_set_elem elem;
3436 struct nft_set_binding *binding;
3437 struct nft_userdata *udata;
3438 struct nft_data data;
3439 enum nft_registers dreg;
3440 struct nft_trans *trans;
3446 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3447 nft_set_elem_policy);
3451 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3454 nft_set_ext_prepare(&tmpl);
3456 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3460 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3462 if (set->flags & NFT_SET_MAP) {
3463 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3464 !(flags & NFT_SET_ELEM_INTERVAL_END))
3466 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3467 flags & NFT_SET_ELEM_INTERVAL_END)
3470 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3475 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3476 if (!(set->flags & NFT_SET_TIMEOUT))
3478 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_ELEM_TIMEOUT]));
3479 } else if (set->flags & NFT_SET_TIMEOUT) {
3480 timeout = set->timeout;
3483 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3484 nla[NFTA_SET_ELEM_KEY]);
3488 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3491 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3493 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3494 if (timeout != set->timeout)
3495 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3498 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3499 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3500 nla[NFTA_SET_ELEM_DATA]);
3505 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3508 dreg = nft_type_to_reg(set->dtype);
3509 list_for_each_entry(binding, &set->bindings, list) {
3510 struct nft_ctx bind_ctx = {
3512 .table = ctx->table,
3513 .chain = (struct nft_chain *)binding->chain,
3516 if (!(binding->flags & NFT_SET_MAP))
3519 err = nft_validate_register_store(&bind_ctx, dreg,
3526 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
3529 /* The full maximum length of userdata can exceed the maximum
3530 * offset value (U8_MAX) for following extensions, therefor it
3531 * must be the last extension added.
3534 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3535 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3537 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3542 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
3543 timeout, GFP_KERNEL);
3544 if (elem.priv == NULL)
3547 ext = nft_set_elem_ext(set, elem.priv);
3549 *nft_set_ext_flags(ext) = flags;
3551 udata = nft_set_ext_userdata(ext);
3552 udata->len = ulen - 1;
3553 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3556 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3560 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
3561 err = set->ops->insert(ctx->net, set, &elem);
3565 nft_trans_elem(trans) = elem;
3566 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3574 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3575 nft_data_uninit(&data, d2.type);
3577 nft_data_uninit(&elem.key.val, d1.type);
3582 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3583 struct sk_buff *skb, const struct nlmsghdr *nlh,
3584 const struct nlattr * const nla[])
3586 u8 genmask = nft_genmask_next(net);
3587 const struct nlattr *attr;
3588 struct nft_set *set;
3592 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3595 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3599 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3602 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3603 set = nf_tables_set_lookup_byid(net,
3604 nla[NFTA_SET_ELEM_LIST_SET_ID],
3608 return PTR_ERR(set);
3611 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3614 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3616 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact))
3619 err = nft_add_set_elem(&ctx, set, attr);
3621 atomic_dec(&set->nelems);
3628 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3629 const struct nlattr *attr)
3631 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3632 struct nft_set_ext_tmpl tmpl;
3633 struct nft_data_desc desc;
3634 struct nft_set_elem elem;
3635 struct nft_set_ext *ext;
3636 struct nft_trans *trans;
3641 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3642 nft_set_elem_policy);
3647 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3650 nft_set_ext_prepare(&tmpl);
3652 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3656 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3658 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3659 nla[NFTA_SET_ELEM_KEY]);
3664 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3667 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3670 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3672 if (elem.priv == NULL)
3675 ext = nft_set_elem_ext(set, elem.priv);
3677 *nft_set_ext_flags(ext) = flags;
3679 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3680 if (trans == NULL) {
3685 priv = set->ops->deactivate(ctx->net, set, &elem);
3693 nft_trans_elem(trans) = elem;
3694 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3702 nft_data_uninit(&elem.key.val, desc.type);
3707 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3708 struct sk_buff *skb, const struct nlmsghdr *nlh,
3709 const struct nlattr * const nla[])
3711 u8 genmask = nft_genmask_next(net);
3712 const struct nlattr *attr;
3713 struct nft_set *set;
3717 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3720 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3724 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3727 return PTR_ERR(set);
3728 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3731 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3732 err = nft_del_setelem(&ctx, set, attr);
3741 void nft_set_gc_batch_release(struct rcu_head *rcu)
3743 struct nft_set_gc_batch *gcb;
3746 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
3747 for (i = 0; i < gcb->head.cnt; i++)
3748 nft_set_elem_destroy(gcb->head.set, gcb->elems[i]);
3751 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
3753 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
3756 struct nft_set_gc_batch *gcb;
3758 gcb = kzalloc(sizeof(*gcb), gfp);
3761 gcb->head.set = set;
3764 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
3766 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
3767 u32 portid, u32 seq)
3769 struct nlmsghdr *nlh;
3770 struct nfgenmsg *nfmsg;
3771 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
3773 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
3775 goto nla_put_failure;
3777 nfmsg = nlmsg_data(nlh);
3778 nfmsg->nfgen_family = AF_UNSPEC;
3779 nfmsg->version = NFNETLINK_V0;
3780 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3782 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
3783 goto nla_put_failure;
3785 nlmsg_end(skb, nlh);
3789 nlmsg_trim(skb, nlh);
3793 static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
3795 struct nlmsghdr *nlh = nlmsg_hdr(skb);
3796 struct sk_buff *skb2;
3799 if (nlmsg_report(nlh) &&
3800 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3804 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3808 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3815 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
3816 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
3819 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
3825 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
3826 struct sk_buff *skb, const struct nlmsghdr *nlh,
3827 const struct nlattr * const nla[])
3829 struct sk_buff *skb2;
3832 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3836 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3841 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3847 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3848 [NFT_MSG_NEWTABLE] = {
3849 .call_batch = nf_tables_newtable,
3850 .attr_count = NFTA_TABLE_MAX,
3851 .policy = nft_table_policy,
3853 [NFT_MSG_GETTABLE] = {
3854 .call = nf_tables_gettable,
3855 .attr_count = NFTA_TABLE_MAX,
3856 .policy = nft_table_policy,
3858 [NFT_MSG_DELTABLE] = {
3859 .call_batch = nf_tables_deltable,
3860 .attr_count = NFTA_TABLE_MAX,
3861 .policy = nft_table_policy,
3863 [NFT_MSG_NEWCHAIN] = {
3864 .call_batch = nf_tables_newchain,
3865 .attr_count = NFTA_CHAIN_MAX,
3866 .policy = nft_chain_policy,
3868 [NFT_MSG_GETCHAIN] = {
3869 .call = nf_tables_getchain,
3870 .attr_count = NFTA_CHAIN_MAX,
3871 .policy = nft_chain_policy,
3873 [NFT_MSG_DELCHAIN] = {
3874 .call_batch = nf_tables_delchain,
3875 .attr_count = NFTA_CHAIN_MAX,
3876 .policy = nft_chain_policy,
3878 [NFT_MSG_NEWRULE] = {
3879 .call_batch = nf_tables_newrule,
3880 .attr_count = NFTA_RULE_MAX,
3881 .policy = nft_rule_policy,
3883 [NFT_MSG_GETRULE] = {
3884 .call = nf_tables_getrule,
3885 .attr_count = NFTA_RULE_MAX,
3886 .policy = nft_rule_policy,
3888 [NFT_MSG_DELRULE] = {
3889 .call_batch = nf_tables_delrule,
3890 .attr_count = NFTA_RULE_MAX,
3891 .policy = nft_rule_policy,
3893 [NFT_MSG_NEWSET] = {
3894 .call_batch = nf_tables_newset,
3895 .attr_count = NFTA_SET_MAX,
3896 .policy = nft_set_policy,
3898 [NFT_MSG_GETSET] = {
3899 .call = nf_tables_getset,
3900 .attr_count = NFTA_SET_MAX,
3901 .policy = nft_set_policy,
3903 [NFT_MSG_DELSET] = {
3904 .call_batch = nf_tables_delset,
3905 .attr_count = NFTA_SET_MAX,
3906 .policy = nft_set_policy,
3908 [NFT_MSG_NEWSETELEM] = {
3909 .call_batch = nf_tables_newsetelem,
3910 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3911 .policy = nft_set_elem_list_policy,
3913 [NFT_MSG_GETSETELEM] = {
3914 .call = nf_tables_getsetelem,
3915 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3916 .policy = nft_set_elem_list_policy,
3918 [NFT_MSG_DELSETELEM] = {
3919 .call_batch = nf_tables_delsetelem,
3920 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3921 .policy = nft_set_elem_list_policy,
3923 [NFT_MSG_GETGEN] = {
3924 .call = nf_tables_getgen,
3928 static void nft_chain_commit_update(struct nft_trans *trans)
3930 struct nft_base_chain *basechain;
3932 if (nft_trans_chain_name(trans)[0])
3933 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3935 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3938 basechain = nft_base_chain(trans->ctx.chain);
3939 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3941 switch (nft_trans_chain_policy(trans)) {
3944 basechain->policy = nft_trans_chain_policy(trans);
3949 static void nf_tables_commit_release(struct nft_trans *trans)
3951 switch (trans->msg_type) {
3952 case NFT_MSG_DELTABLE:
3953 nf_tables_table_destroy(&trans->ctx);
3955 case NFT_MSG_DELCHAIN:
3956 nf_tables_chain_destroy(trans->ctx.chain);
3958 case NFT_MSG_DELRULE:
3959 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3961 case NFT_MSG_DELSET:
3962 nft_set_destroy(nft_trans_set(trans));
3964 case NFT_MSG_DELSETELEM:
3965 nft_set_elem_destroy(nft_trans_elem_set(trans),
3966 nft_trans_elem(trans).priv);
3972 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
3974 struct nft_trans *trans, *next;
3975 struct nft_trans_elem *te;
3977 /* Bump generation counter, invalidate any dump in progress */
3978 while (++net->nft.base_seq == 0);
3980 /* A new generation has just started */
3981 net->nft.gencursor = nft_gencursor_next(net);
3983 /* Make sure all packets have left the previous generation before
3984 * purging old rules.
3988 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3989 switch (trans->msg_type) {
3990 case NFT_MSG_NEWTABLE:
3991 if (nft_trans_table_update(trans)) {
3992 if (!nft_trans_table_enable(trans)) {
3993 nf_tables_table_disable(net,
3996 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3999 nft_clear(net, trans->ctx.table);
4001 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
4002 nft_trans_destroy(trans);
4004 case NFT_MSG_DELTABLE:
4005 list_del_rcu(&trans->ctx.table->list);
4006 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
4008 case NFT_MSG_NEWCHAIN:
4009 if (nft_trans_chain_update(trans))
4010 nft_chain_commit_update(trans);
4012 nft_clear(net, trans->ctx.chain);
4014 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
4015 nft_trans_destroy(trans);
4017 case NFT_MSG_DELCHAIN:
4018 list_del_rcu(&trans->ctx.chain->list);
4019 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
4020 nf_tables_unregister_hooks(trans->ctx.net,
4023 trans->ctx.afi->nops);
4025 case NFT_MSG_NEWRULE:
4026 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4027 nf_tables_rule_notify(&trans->ctx,
4028 nft_trans_rule(trans),
4030 nft_trans_destroy(trans);
4032 case NFT_MSG_DELRULE:
4033 list_del_rcu(&nft_trans_rule(trans)->list);
4034 nf_tables_rule_notify(&trans->ctx,
4035 nft_trans_rule(trans),
4038 case NFT_MSG_NEWSET:
4039 nft_clear(net, nft_trans_set(trans));
4040 /* This avoids hitting -EBUSY when deleting the table
4041 * from the transaction.
4043 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4044 !list_empty(&nft_trans_set(trans)->bindings))
4045 trans->ctx.table->use--;
4047 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4048 NFT_MSG_NEWSET, GFP_KERNEL);
4049 nft_trans_destroy(trans);
4051 case NFT_MSG_DELSET:
4052 list_del_rcu(&nft_trans_set(trans)->list);
4053 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4054 NFT_MSG_DELSET, GFP_KERNEL);
4056 case NFT_MSG_NEWSETELEM:
4057 te = (struct nft_trans_elem *)trans->data;
4059 te->set->ops->activate(net, te->set, &te->elem);
4060 nf_tables_setelem_notify(&trans->ctx, te->set,
4062 NFT_MSG_NEWSETELEM, 0);
4063 nft_trans_destroy(trans);
4065 case NFT_MSG_DELSETELEM:
4066 te = (struct nft_trans_elem *)trans->data;
4068 nf_tables_setelem_notify(&trans->ctx, te->set,
4070 NFT_MSG_DELSETELEM, 0);
4071 te->set->ops->remove(te->set, &te->elem);
4072 atomic_dec(&te->set->nelems);
4080 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4081 list_del(&trans->list);
4082 nf_tables_commit_release(trans);
4085 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
4090 static void nf_tables_abort_release(struct nft_trans *trans)
4092 switch (trans->msg_type) {
4093 case NFT_MSG_NEWTABLE:
4094 nf_tables_table_destroy(&trans->ctx);
4096 case NFT_MSG_NEWCHAIN:
4097 nf_tables_chain_destroy(trans->ctx.chain);
4099 case NFT_MSG_NEWRULE:
4100 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4102 case NFT_MSG_NEWSET:
4103 nft_set_destroy(nft_trans_set(trans));
4105 case NFT_MSG_NEWSETELEM:
4106 nft_set_elem_destroy(nft_trans_elem_set(trans),
4107 nft_trans_elem(trans).priv);
4113 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
4115 struct nft_trans *trans, *next;
4116 struct nft_trans_elem *te;
4118 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4120 switch (trans->msg_type) {
4121 case NFT_MSG_NEWTABLE:
4122 if (nft_trans_table_update(trans)) {
4123 if (nft_trans_table_enable(trans)) {
4124 nf_tables_table_disable(net,
4127 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4129 nft_trans_destroy(trans);
4131 list_del_rcu(&trans->ctx.table->list);
4134 case NFT_MSG_DELTABLE:
4135 nft_clear(trans->ctx.net, trans->ctx.table);
4136 nft_trans_destroy(trans);
4138 case NFT_MSG_NEWCHAIN:
4139 if (nft_trans_chain_update(trans)) {
4140 free_percpu(nft_trans_chain_stats(trans));
4142 nft_trans_destroy(trans);
4144 trans->ctx.table->use--;
4145 list_del_rcu(&trans->ctx.chain->list);
4146 nf_tables_unregister_hooks(trans->ctx.net,
4149 trans->ctx.afi->nops);
4152 case NFT_MSG_DELCHAIN:
4153 trans->ctx.table->use++;
4154 nft_clear(trans->ctx.net, trans->ctx.chain);
4155 nft_trans_destroy(trans);
4157 case NFT_MSG_NEWRULE:
4158 trans->ctx.chain->use--;
4159 list_del_rcu(&nft_trans_rule(trans)->list);
4161 case NFT_MSG_DELRULE:
4162 trans->ctx.chain->use++;
4163 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4164 nft_trans_destroy(trans);
4166 case NFT_MSG_NEWSET:
4167 trans->ctx.table->use--;
4168 list_del_rcu(&nft_trans_set(trans)->list);
4170 case NFT_MSG_DELSET:
4171 trans->ctx.table->use++;
4172 nft_clear(trans->ctx.net, nft_trans_set(trans));
4173 nft_trans_destroy(trans);
4175 case NFT_MSG_NEWSETELEM:
4176 te = (struct nft_trans_elem *)trans->data;
4178 te->set->ops->remove(te->set, &te->elem);
4179 atomic_dec(&te->set->nelems);
4181 case NFT_MSG_DELSETELEM:
4182 te = (struct nft_trans_elem *)trans->data;
4184 te->set->ops->activate(net, te->set, &te->elem);
4187 nft_trans_destroy(trans);
4194 list_for_each_entry_safe_reverse(trans, next,
4195 &net->nft.commit_list, list) {
4196 list_del(&trans->list);
4197 nf_tables_abort_release(trans);
4203 static const struct nfnetlink_subsystem nf_tables_subsys = {
4204 .name = "nf_tables",
4205 .subsys_id = NFNL_SUBSYS_NFTABLES,
4206 .cb_count = NFT_MSG_MAX,
4208 .commit = nf_tables_commit,
4209 .abort = nf_tables_abort,
4212 int nft_chain_validate_dependency(const struct nft_chain *chain,
4213 enum nft_chain_type type)
4215 const struct nft_base_chain *basechain;
4217 if (chain->flags & NFT_BASE_CHAIN) {
4218 basechain = nft_base_chain(chain);
4219 if (basechain->type->type != type)
4224 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
4226 int nft_chain_validate_hooks(const struct nft_chain *chain,
4227 unsigned int hook_flags)
4229 struct nft_base_chain *basechain;
4231 if (chain->flags & NFT_BASE_CHAIN) {
4232 basechain = nft_base_chain(chain);
4234 if ((1 << basechain->ops[0].hooknum) & hook_flags)
4242 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
4245 * Loop detection - walk through the ruleset beginning at the destination chain
4246 * of a new jump until either the source chain is reached (loop) or all
4247 * reachable chains have been traversed.
4249 * The loop check is performed whenever a new jump verdict is added to an
4250 * expression or verdict map or a verdict map is bound to a new chain.
4253 static int nf_tables_check_loops(const struct nft_ctx *ctx,
4254 const struct nft_chain *chain);
4256 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
4257 const struct nft_set *set,
4258 const struct nft_set_iter *iter,
4259 const struct nft_set_elem *elem)
4261 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4262 const struct nft_data *data;
4264 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4265 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
4268 data = nft_set_ext_data(ext);
4269 switch (data->verdict.code) {
4272 return nf_tables_check_loops(ctx, data->verdict.chain);
4278 static int nf_tables_check_loops(const struct nft_ctx *ctx,
4279 const struct nft_chain *chain)
4281 const struct nft_rule *rule;
4282 const struct nft_expr *expr, *last;
4283 const struct nft_set *set;
4284 struct nft_set_binding *binding;
4285 struct nft_set_iter iter;
4287 if (ctx->chain == chain)
4290 list_for_each_entry(rule, &chain->rules, list) {
4291 nft_rule_for_each_expr(expr, last, rule) {
4292 const struct nft_data *data = NULL;
4295 if (!expr->ops->validate)
4298 err = expr->ops->validate(ctx, expr, &data);
4305 switch (data->verdict.code) {
4308 err = nf_tables_check_loops(ctx,
4309 data->verdict.chain);
4318 list_for_each_entry(set, &ctx->table->sets, list) {
4319 if (!nft_is_active_next(ctx->net, set))
4321 if (!(set->flags & NFT_SET_MAP) ||
4322 set->dtype != NFT_DATA_VERDICT)
4325 list_for_each_entry(binding, &set->bindings, list) {
4326 if (!(binding->flags & NFT_SET_MAP) ||
4327 binding->chain != chain)
4330 iter.genmask = nft_genmask_next(ctx->net);
4334 iter.fn = nf_tables_loop_check_setelem;
4336 set->ops->walk(ctx, set, &iter);
4346 * nft_parse_register - parse a register value from a netlink attribute
4348 * @attr: netlink attribute
4350 * Parse and translate a register value from a netlink attribute.
4351 * Registers used to be 128 bit wide, these register numbers will be
4352 * mapped to the corresponding 32 bit register numbers.
4354 unsigned int nft_parse_register(const struct nlattr *attr)
4358 reg = ntohl(nla_get_be32(attr));
4360 case NFT_REG_VERDICT...NFT_REG_4:
4361 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
4363 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
4366 EXPORT_SYMBOL_GPL(nft_parse_register);
4369 * nft_dump_register - dump a register value to a netlink attribute
4371 * @skb: socket buffer
4372 * @attr: attribute number
4373 * @reg: register number
4375 * Construct a netlink attribute containing the register number. For
4376 * compatibility reasons, register numbers being a multiple of 4 are
4377 * translated to the corresponding 128 bit register numbers.
4379 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
4381 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
4382 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
4384 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
4386 return nla_put_be32(skb, attr, htonl(reg));
4388 EXPORT_SYMBOL_GPL(nft_dump_register);
4391 * nft_validate_register_load - validate a load from a register
4393 * @reg: the register number
4394 * @len: the length of the data
4396 * Validate that the input register is one of the general purpose
4397 * registers and that the length of the load is within the bounds.
4399 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
4401 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
4405 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
4410 EXPORT_SYMBOL_GPL(nft_validate_register_load);
4413 * nft_validate_register_store - validate an expressions' register store
4415 * @ctx: context of the expression performing the load
4416 * @reg: the destination register number
4417 * @data: the data to load
4418 * @type: the data type
4419 * @len: the length of the data
4421 * Validate that a data load uses the appropriate data type for
4422 * the destination register and the length is within the bounds.
4423 * A value of NULL for the data means that its runtime gathered
4426 int nft_validate_register_store(const struct nft_ctx *ctx,
4427 enum nft_registers reg,
4428 const struct nft_data *data,
4429 enum nft_data_types type, unsigned int len)
4434 case NFT_REG_VERDICT:
4435 if (type != NFT_DATA_VERDICT)
4439 (data->verdict.code == NFT_GOTO ||
4440 data->verdict.code == NFT_JUMP)) {
4441 err = nf_tables_check_loops(ctx, data->verdict.chain);
4445 if (ctx->chain->level + 1 >
4446 data->verdict.chain->level) {
4447 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
4449 data->verdict.chain->level = ctx->chain->level + 1;
4455 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
4459 if (reg * NFT_REG32_SIZE + len >
4460 FIELD_SIZEOF(struct nft_regs, data))
4463 if (data != NULL && type != NFT_DATA_VALUE)
4468 EXPORT_SYMBOL_GPL(nft_validate_register_store);
4470 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
4471 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
4472 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
4473 .len = NFT_CHAIN_MAXNAMELEN - 1 },
4476 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
4477 struct nft_data_desc *desc, const struct nlattr *nla)
4479 u8 genmask = nft_genmask_next(ctx->net);
4480 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
4481 struct nft_chain *chain;
4484 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
4488 if (!tb[NFTA_VERDICT_CODE])
4490 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
4492 switch (data->verdict.code) {
4494 switch (data->verdict.code & NF_VERDICT_MASK) {
4509 if (!tb[NFTA_VERDICT_CHAIN])
4511 chain = nf_tables_chain_lookup(ctx->table,
4512 tb[NFTA_VERDICT_CHAIN], genmask);
4514 return PTR_ERR(chain);
4515 if (chain->flags & NFT_BASE_CHAIN)
4519 data->verdict.chain = chain;
4523 desc->len = sizeof(data->verdict);
4524 desc->type = NFT_DATA_VERDICT;
4528 static void nft_verdict_uninit(const struct nft_data *data)
4530 switch (data->verdict.code) {
4533 data->verdict.chain->use--;
4538 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
4540 struct nlattr *nest;
4542 nest = nla_nest_start(skb, type);
4544 goto nla_put_failure;
4546 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
4547 goto nla_put_failure;
4552 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
4554 goto nla_put_failure;
4556 nla_nest_end(skb, nest);
4563 static int nft_value_init(const struct nft_ctx *ctx,
4564 struct nft_data *data, unsigned int size,
4565 struct nft_data_desc *desc, const struct nlattr *nla)
4575 nla_memcpy(data->data, nla, len);
4576 desc->type = NFT_DATA_VALUE;
4581 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
4584 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
4587 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
4588 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
4589 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
4593 * nft_data_init - parse nf_tables data netlink attributes
4595 * @ctx: context of the expression using the data
4596 * @data: destination struct nft_data
4597 * @size: maximum data length
4598 * @desc: data description
4599 * @nla: netlink attribute containing data
4601 * Parse the netlink data attributes and initialize a struct nft_data.
4602 * The type and length of data are returned in the data description.
4604 * The caller can indicate that it only wants to accept data of type
4605 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4607 int nft_data_init(const struct nft_ctx *ctx,
4608 struct nft_data *data, unsigned int size,
4609 struct nft_data_desc *desc, const struct nlattr *nla)
4611 struct nlattr *tb[NFTA_DATA_MAX + 1];
4614 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
4618 if (tb[NFTA_DATA_VALUE])
4619 return nft_value_init(ctx, data, size, desc,
4620 tb[NFTA_DATA_VALUE]);
4621 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
4622 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
4625 EXPORT_SYMBOL_GPL(nft_data_init);
4628 * nft_data_uninit - release a nft_data item
4630 * @data: struct nft_data to release
4631 * @type: type of data
4633 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4634 * all others need to be released by calling this function.
4636 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
4638 if (type < NFT_DATA_VERDICT)
4641 case NFT_DATA_VERDICT:
4642 return nft_verdict_uninit(data);
4647 EXPORT_SYMBOL_GPL(nft_data_uninit);
4649 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4650 enum nft_data_types type, unsigned int len)
4652 struct nlattr *nest;
4655 nest = nla_nest_start(skb, attr);
4660 case NFT_DATA_VALUE:
4661 err = nft_value_dump(skb, data, len);
4663 case NFT_DATA_VERDICT:
4664 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
4671 nla_nest_end(skb, nest);
4674 EXPORT_SYMBOL_GPL(nft_data_dump);
4676 static int __net_init nf_tables_init_net(struct net *net)
4678 INIT_LIST_HEAD(&net->nft.af_info);
4679 INIT_LIST_HEAD(&net->nft.commit_list);
4680 net->nft.base_seq = 1;
4684 int __nft_release_basechain(struct nft_ctx *ctx)
4686 struct nft_rule *rule, *nr;
4688 BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
4690 nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
4692 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
4693 list_del(&rule->list);
4695 nf_tables_rule_destroy(ctx, rule);
4697 list_del(&ctx->chain->list);
4699 nf_tables_chain_destroy(ctx->chain);
4703 EXPORT_SYMBOL_GPL(__nft_release_basechain);
4705 /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
4706 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
4708 struct nft_table *table, *nt;
4709 struct nft_chain *chain, *nc;
4710 struct nft_rule *rule, *nr;
4711 struct nft_set *set, *ns;
4712 struct nft_ctx ctx = {
4717 list_for_each_entry_safe(table, nt, &afi->tables, list) {
4718 list_for_each_entry(chain, &table->chains, list)
4719 nf_tables_unregister_hooks(net, table, chain,
4721 /* No packets are walking on these chains anymore. */
4723 list_for_each_entry(chain, &table->chains, list) {
4725 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
4726 list_del(&rule->list);
4728 nf_tables_rule_destroy(&ctx, rule);
4731 list_for_each_entry_safe(set, ns, &table->sets, list) {
4732 list_del(&set->list);
4734 nft_set_destroy(set);
4736 list_for_each_entry_safe(chain, nc, &table->chains, list) {
4737 list_del(&chain->list);
4739 nf_tables_chain_destroy(chain);
4741 list_del(&table->list);
4742 nf_tables_table_destroy(&ctx);
4746 static struct pernet_operations nf_tables_net_ops = {
4747 .init = nf_tables_init_net,
4750 static int __init nf_tables_module_init(void)
4754 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4761 err = nf_tables_core_module_init();
4765 err = nfnetlink_subsys_register(&nf_tables_subsys);
4769 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4770 return register_pernet_subsys(&nf_tables_net_ops);
4772 nf_tables_core_module_exit();
4779 static void __exit nf_tables_module_exit(void)
4781 unregister_pernet_subsys(&nf_tables_net_ops);
4782 nfnetlink_subsys_unregister(&nf_tables_subsys);
4784 nf_tables_core_module_exit();
4788 module_init(nf_tables_module_init);
4789 module_exit(nf_tables_module_exit);
4791 MODULE_LICENSE("GPL");
4792 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4793 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);