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/vmalloc.h>
17 #include <linux/netfilter.h>
18 #include <linux/netfilter/nfnetlink.h>
19 #include <linux/netfilter/nf_tables.h>
20 #include <net/netfilter/nf_tables_core.h>
21 #include <net/netfilter/nf_tables.h>
22 #include <net/net_namespace.h>
25 static LIST_HEAD(nf_tables_expressions);
26 static LIST_HEAD(nf_tables_objects);
29 * nft_register_afinfo - register nf_tables address family info
31 * @afi: address family info to register
33 * Register the address family for use with nf_tables. Returns zero on
34 * success or a negative errno code otherwise.
36 int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
38 INIT_LIST_HEAD(&afi->tables);
39 nfnl_lock(NFNL_SUBSYS_NFTABLES);
40 list_add_tail_rcu(&afi->list, &net->nft.af_info);
41 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
44 EXPORT_SYMBOL_GPL(nft_register_afinfo);
46 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi);
49 * nft_unregister_afinfo - unregister nf_tables address family info
51 * @afi: address family info to unregister
53 * Unregister the address family for use with nf_tables.
55 void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi)
57 nfnl_lock(NFNL_SUBSYS_NFTABLES);
58 __nft_release_afinfo(net, afi);
59 list_del_rcu(&afi->list);
60 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
62 EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
64 static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
66 struct nft_af_info *afi;
68 list_for_each_entry(afi, &net->nft.af_info, list) {
69 if (afi->family == family)
75 static struct nft_af_info *
76 nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
78 struct nft_af_info *afi;
80 afi = nft_afinfo_lookup(net, family);
85 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
86 request_module("nft-afinfo-%u", family);
87 nfnl_lock(NFNL_SUBSYS_NFTABLES);
88 afi = nft_afinfo_lookup(net, family);
90 return ERR_PTR(-EAGAIN);
93 return ERR_PTR(-EAFNOSUPPORT);
96 static void nft_ctx_init(struct nft_ctx *ctx,
98 const struct sk_buff *skb,
99 const struct nlmsghdr *nlh,
100 struct nft_af_info *afi,
101 struct nft_table *table,
102 struct nft_chain *chain,
103 const struct nlattr * const *nla)
110 ctx->portid = NETLINK_CB(skb).portid;
111 ctx->report = nlmsg_report(nlh);
112 ctx->seq = nlh->nlmsg_seq;
115 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
116 int msg_type, u32 size, gfp_t gfp)
118 struct nft_trans *trans;
120 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
124 trans->msg_type = msg_type;
130 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
131 int msg_type, u32 size)
133 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
136 static void nft_trans_destroy(struct nft_trans *trans)
138 list_del(&trans->list);
142 static int nf_tables_register_hooks(struct net *net,
143 const struct nft_table *table,
144 struct nft_chain *chain,
145 unsigned int hook_nops)
147 if (table->flags & NFT_TABLE_F_DORMANT ||
148 !nft_is_base_chain(chain))
151 return nf_register_net_hooks(net, nft_base_chain(chain)->ops,
155 static void nf_tables_unregister_hooks(struct net *net,
156 const struct nft_table *table,
157 struct nft_chain *chain,
158 unsigned int hook_nops)
160 if (table->flags & NFT_TABLE_F_DORMANT ||
161 !nft_is_base_chain(chain))
164 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops, hook_nops);
167 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
169 struct nft_trans *trans;
171 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
175 if (msg_type == NFT_MSG_NEWTABLE)
176 nft_activate_next(ctx->net, ctx->table);
178 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
182 static int nft_deltable(struct nft_ctx *ctx)
186 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
190 nft_deactivate_next(ctx->net, ctx->table);
194 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
196 struct nft_trans *trans;
198 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
202 if (msg_type == NFT_MSG_NEWCHAIN)
203 nft_activate_next(ctx->net, ctx->chain);
205 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
209 static int nft_delchain(struct nft_ctx *ctx)
213 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
218 nft_deactivate_next(ctx->net, ctx->chain);
224 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
226 /* You cannot delete the same rule twice */
227 if (nft_is_active_next(ctx->net, rule)) {
228 nft_deactivate_next(ctx->net, rule);
235 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
236 struct nft_rule *rule)
238 struct nft_trans *trans;
240 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
244 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
245 nft_trans_rule_id(trans) =
246 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
248 nft_trans_rule(trans) = rule;
249 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
254 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
256 struct nft_trans *trans;
259 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
263 err = nf_tables_delrule_deactivate(ctx, rule);
265 nft_trans_destroy(trans);
272 static int nft_delrule_by_chain(struct nft_ctx *ctx)
274 struct nft_rule *rule;
277 list_for_each_entry(rule, &ctx->chain->rules, list) {
278 err = nft_delrule(ctx, rule);
285 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
288 struct nft_trans *trans;
290 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
294 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
295 nft_trans_set_id(trans) =
296 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
297 nft_activate_next(ctx->net, set);
299 nft_trans_set(trans) = set;
300 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
305 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
309 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
313 nft_deactivate_next(ctx->net, set);
319 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
320 struct nft_object *obj)
322 struct nft_trans *trans;
324 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
328 if (msg_type == NFT_MSG_NEWOBJ)
329 nft_activate_next(ctx->net, obj);
331 nft_trans_obj(trans) = obj;
332 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
337 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
341 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
345 nft_deactivate_next(ctx->net, obj);
355 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
356 const struct nlattr *nla,
359 struct nft_table *table;
361 list_for_each_entry(table, &afi->tables, list) {
362 if (!nla_strcmp(nla, table->name) &&
363 nft_active_genmask(table, genmask))
369 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
370 const struct nlattr *nla,
373 struct nft_table *table;
376 return ERR_PTR(-EINVAL);
378 table = nft_table_lookup(afi, nla, genmask);
382 return ERR_PTR(-ENOENT);
385 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
387 return ++table->hgenerator;
390 static const struct nf_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
392 static const struct nf_chain_type *
393 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
397 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
398 if (chain_type[family][i] != NULL &&
399 !nla_strcmp(nla, chain_type[family][i]->name))
400 return chain_type[family][i];
405 static const struct nf_chain_type *
406 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
407 const struct nlattr *nla,
410 const struct nf_chain_type *type;
412 type = __nf_tables_chain_type_lookup(afi->family, nla);
415 #ifdef CONFIG_MODULES
417 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
418 request_module("nft-chain-%u-%.*s", afi->family,
419 nla_len(nla), (const char *)nla_data(nla));
420 nfnl_lock(NFNL_SUBSYS_NFTABLES);
421 type = __nf_tables_chain_type_lookup(afi->family, nla);
423 return ERR_PTR(-EAGAIN);
426 return ERR_PTR(-ENOENT);
429 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
430 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
431 .len = NFT_TABLE_MAXNAMELEN - 1 },
432 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
435 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
436 u32 portid, u32 seq, int event, u32 flags,
437 int family, const struct nft_table *table)
439 struct nlmsghdr *nlh;
440 struct nfgenmsg *nfmsg;
442 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
443 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
445 goto nla_put_failure;
447 nfmsg = nlmsg_data(nlh);
448 nfmsg->nfgen_family = family;
449 nfmsg->version = NFNETLINK_V0;
450 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
452 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
453 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
454 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
455 goto nla_put_failure;
461 nlmsg_trim(skb, nlh);
465 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
471 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
474 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
478 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
479 event, 0, ctx->afi->family, ctx->table);
485 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
486 ctx->report, GFP_KERNEL);
489 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
492 static int nf_tables_dump_tables(struct sk_buff *skb,
493 struct netlink_callback *cb)
495 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
496 const struct nft_af_info *afi;
497 const struct nft_table *table;
498 unsigned int idx = 0, s_idx = cb->args[0];
499 struct net *net = sock_net(skb->sk);
500 int family = nfmsg->nfgen_family;
503 cb->seq = net->nft.base_seq;
505 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
506 if (family != NFPROTO_UNSPEC && family != afi->family)
509 list_for_each_entry_rcu(table, &afi->tables, list) {
513 memset(&cb->args[1], 0,
514 sizeof(cb->args) - sizeof(cb->args[0]));
515 if (!nft_is_active(net, table))
517 if (nf_tables_fill_table_info(skb, net,
518 NETLINK_CB(cb->skb).portid,
522 afi->family, table) < 0)
525 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
536 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
537 struct sk_buff *skb, const struct nlmsghdr *nlh,
538 const struct nlattr * const nla[],
539 struct netlink_ext_ack *extack)
541 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
542 u8 genmask = nft_genmask_cur(net);
543 const struct nft_af_info *afi;
544 const struct nft_table *table;
545 struct sk_buff *skb2;
546 int family = nfmsg->nfgen_family;
549 if (nlh->nlmsg_flags & NLM_F_DUMP) {
550 struct netlink_dump_control c = {
551 .dump = nf_tables_dump_tables,
553 return netlink_dump_start(nlsk, skb, nlh, &c);
556 afi = nf_tables_afinfo_lookup(net, family, false);
560 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
562 return PTR_ERR(table);
564 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
568 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
569 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
574 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
581 static void _nf_tables_table_disable(struct net *net,
582 const struct nft_af_info *afi,
583 struct nft_table *table,
586 struct nft_chain *chain;
589 list_for_each_entry(chain, &table->chains, list) {
590 if (!nft_is_active_next(net, chain))
592 if (!nft_is_base_chain(chain))
595 if (cnt && i++ == cnt)
598 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
603 static int nf_tables_table_enable(struct net *net,
604 const struct nft_af_info *afi,
605 struct nft_table *table)
607 struct nft_chain *chain;
610 list_for_each_entry(chain, &table->chains, list) {
611 if (!nft_is_active_next(net, chain))
613 if (!nft_is_base_chain(chain))
616 err = nf_register_net_hooks(net, nft_base_chain(chain)->ops,
626 _nf_tables_table_disable(net, afi, table, i);
630 static void nf_tables_table_disable(struct net *net,
631 const struct nft_af_info *afi,
632 struct nft_table *table)
634 _nf_tables_table_disable(net, afi, table, 0);
637 static int nf_tables_updtable(struct nft_ctx *ctx)
639 struct nft_trans *trans;
643 if (!ctx->nla[NFTA_TABLE_FLAGS])
646 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
647 if (flags & ~NFT_TABLE_F_DORMANT)
650 if (flags == ctx->table->flags)
653 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
654 sizeof(struct nft_trans_table));
658 if ((flags & NFT_TABLE_F_DORMANT) &&
659 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
660 nft_trans_table_enable(trans) = false;
661 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
662 ctx->table->flags & NFT_TABLE_F_DORMANT) {
663 ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table);
665 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
666 nft_trans_table_enable(trans) = true;
672 nft_trans_table_update(trans) = true;
673 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
676 nft_trans_destroy(trans);
680 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
681 struct sk_buff *skb, const struct nlmsghdr *nlh,
682 const struct nlattr * const nla[],
683 struct netlink_ext_ack *extack)
685 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
686 u8 genmask = nft_genmask_next(net);
687 const struct nlattr *name;
688 struct nft_af_info *afi;
689 struct nft_table *table;
690 int family = nfmsg->nfgen_family;
695 afi = nf_tables_afinfo_lookup(net, family, true);
699 name = nla[NFTA_TABLE_NAME];
700 table = nf_tables_table_lookup(afi, name, genmask);
702 if (PTR_ERR(table) != -ENOENT)
703 return PTR_ERR(table);
705 if (nlh->nlmsg_flags & NLM_F_EXCL)
707 if (nlh->nlmsg_flags & NLM_F_REPLACE)
710 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
711 return nf_tables_updtable(&ctx);
714 if (nla[NFTA_TABLE_FLAGS]) {
715 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
716 if (flags & ~NFT_TABLE_F_DORMANT)
721 if (!try_module_get(afi->owner))
725 table = kzalloc(sizeof(*table), GFP_KERNEL);
729 table->name = nla_strdup(name, GFP_KERNEL);
730 if (table->name == NULL)
733 INIT_LIST_HEAD(&table->chains);
734 INIT_LIST_HEAD(&table->sets);
735 INIT_LIST_HEAD(&table->objects);
736 table->flags = flags;
738 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
739 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
743 list_add_tail_rcu(&table->list, &afi->tables);
750 module_put(afi->owner);
755 static int nft_flush_table(struct nft_ctx *ctx)
758 struct nft_chain *chain, *nc;
759 struct nft_object *obj, *ne;
760 struct nft_set *set, *ns;
762 list_for_each_entry(chain, &ctx->table->chains, list) {
763 if (!nft_is_active_next(ctx->net, chain))
768 err = nft_delrule_by_chain(ctx);
773 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
774 if (!nft_is_active_next(ctx->net, set))
777 if (set->flags & NFT_SET_ANONYMOUS &&
778 !list_empty(&set->bindings))
781 err = nft_delset(ctx, set);
786 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
787 err = nft_delobj(ctx, obj);
792 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
793 if (!nft_is_active_next(ctx->net, chain))
798 err = nft_delchain(ctx);
803 err = nft_deltable(ctx);
808 static int nft_flush(struct nft_ctx *ctx, int family)
810 struct nft_af_info *afi;
811 struct nft_table *table, *nt;
812 const struct nlattr * const *nla = ctx->nla;
815 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
816 if (family != AF_UNSPEC && afi->family != family)
820 list_for_each_entry_safe(table, nt, &afi->tables, list) {
821 if (!nft_is_active_next(ctx->net, table))
824 if (nla[NFTA_TABLE_NAME] &&
825 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
830 err = nft_flush_table(ctx);
839 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
840 struct sk_buff *skb, const struct nlmsghdr *nlh,
841 const struct nlattr * const nla[],
842 struct netlink_ext_ack *extack)
844 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
845 u8 genmask = nft_genmask_next(net);
846 struct nft_af_info *afi;
847 struct nft_table *table;
848 int family = nfmsg->nfgen_family;
851 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
852 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
853 return nft_flush(&ctx, family);
855 afi = nf_tables_afinfo_lookup(net, family, false);
859 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
861 return PTR_ERR(table);
863 if (nlh->nlmsg_flags & NLM_F_NONREC &&
870 return nft_flush_table(&ctx);
873 static void nf_tables_table_destroy(struct nft_ctx *ctx)
875 BUG_ON(ctx->table->use > 0);
877 kfree(ctx->table->name);
879 module_put(ctx->afi->owner);
882 int nft_register_chain_type(const struct nf_chain_type *ctype)
886 if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO))
889 nfnl_lock(NFNL_SUBSYS_NFTABLES);
890 if (chain_type[ctype->family][ctype->type] != NULL) {
894 chain_type[ctype->family][ctype->type] = ctype;
896 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
899 EXPORT_SYMBOL_GPL(nft_register_chain_type);
901 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
903 nfnl_lock(NFNL_SUBSYS_NFTABLES);
904 chain_type[ctype->family][ctype->type] = NULL;
905 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
907 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
913 static struct nft_chain *
914 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle,
917 struct nft_chain *chain;
919 list_for_each_entry(chain, &table->chains, list) {
920 if (chain->handle == handle &&
921 nft_active_genmask(chain, genmask))
925 return ERR_PTR(-ENOENT);
928 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
929 const struct nlattr *nla,
932 struct nft_chain *chain;
935 return ERR_PTR(-EINVAL);
937 list_for_each_entry(chain, &table->chains, list) {
938 if (!nla_strcmp(nla, chain->name) &&
939 nft_active_genmask(chain, genmask))
943 return ERR_PTR(-ENOENT);
946 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
947 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
948 .len = NFT_TABLE_MAXNAMELEN - 1 },
949 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
950 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
951 .len = NFT_CHAIN_MAXNAMELEN - 1 },
952 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
953 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
954 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
955 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
958 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
959 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
960 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
961 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
962 .len = IFNAMSIZ - 1 },
965 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
967 struct nft_stats *cpu_stats, total;
973 memset(&total, 0, sizeof(total));
974 for_each_possible_cpu(cpu) {
975 cpu_stats = per_cpu_ptr(stats, cpu);
977 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
978 pkts = cpu_stats->pkts;
979 bytes = cpu_stats->bytes;
980 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
982 total.bytes += bytes;
984 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
986 goto nla_put_failure;
988 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
990 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
992 goto nla_put_failure;
994 nla_nest_end(skb, nest);
1001 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1002 u32 portid, u32 seq, int event, u32 flags,
1003 int family, const struct nft_table *table,
1004 const struct nft_chain *chain)
1006 struct nlmsghdr *nlh;
1007 struct nfgenmsg *nfmsg;
1009 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1010 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1012 goto nla_put_failure;
1014 nfmsg = nlmsg_data(nlh);
1015 nfmsg->nfgen_family = family;
1016 nfmsg->version = NFNETLINK_V0;
1017 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1019 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1020 goto nla_put_failure;
1021 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1023 goto nla_put_failure;
1024 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1025 goto nla_put_failure;
1027 if (nft_is_base_chain(chain)) {
1028 const struct nft_base_chain *basechain = nft_base_chain(chain);
1029 const struct nf_hook_ops *ops = &basechain->ops[0];
1030 struct nlattr *nest;
1032 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
1034 goto nla_put_failure;
1035 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1036 goto nla_put_failure;
1037 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1038 goto nla_put_failure;
1039 if (basechain->dev_name[0] &&
1040 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1041 goto nla_put_failure;
1042 nla_nest_end(skb, nest);
1044 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1045 htonl(basechain->policy)))
1046 goto nla_put_failure;
1048 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1049 goto nla_put_failure;
1051 if (basechain->stats && nft_dump_stats(skb, basechain->stats))
1052 goto nla_put_failure;
1055 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1056 goto nla_put_failure;
1058 nlmsg_end(skb, nlh);
1062 nlmsg_trim(skb, nlh);
1066 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1068 struct sk_buff *skb;
1072 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1075 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1079 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1080 event, 0, ctx->afi->family, ctx->table,
1087 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1088 ctx->report, GFP_KERNEL);
1091 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1094 static int nf_tables_dump_chains(struct sk_buff *skb,
1095 struct netlink_callback *cb)
1097 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1098 const struct nft_af_info *afi;
1099 const struct nft_table *table;
1100 const struct nft_chain *chain;
1101 unsigned int idx = 0, s_idx = cb->args[0];
1102 struct net *net = sock_net(skb->sk);
1103 int family = nfmsg->nfgen_family;
1106 cb->seq = net->nft.base_seq;
1108 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1109 if (family != NFPROTO_UNSPEC && family != afi->family)
1112 list_for_each_entry_rcu(table, &afi->tables, list) {
1113 list_for_each_entry_rcu(chain, &table->chains, list) {
1117 memset(&cb->args[1], 0,
1118 sizeof(cb->args) - sizeof(cb->args[0]));
1119 if (!nft_is_active(net, chain))
1121 if (nf_tables_fill_chain_info(skb, net,
1122 NETLINK_CB(cb->skb).portid,
1126 afi->family, table, chain) < 0)
1129 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1141 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1142 struct sk_buff *skb, const struct nlmsghdr *nlh,
1143 const struct nlattr * const nla[],
1144 struct netlink_ext_ack *extack)
1146 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1147 u8 genmask = nft_genmask_cur(net);
1148 const struct nft_af_info *afi;
1149 const struct nft_table *table;
1150 const struct nft_chain *chain;
1151 struct sk_buff *skb2;
1152 int family = nfmsg->nfgen_family;
1155 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1156 struct netlink_dump_control c = {
1157 .dump = nf_tables_dump_chains,
1159 return netlink_dump_start(nlsk, skb, nlh, &c);
1162 afi = nf_tables_afinfo_lookup(net, family, false);
1164 return PTR_ERR(afi);
1166 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1168 return PTR_ERR(table);
1170 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1172 return PTR_ERR(chain);
1174 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1178 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1179 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1180 family, table, chain);
1184 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1191 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1192 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1193 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1196 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1198 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1199 struct nft_stats __percpu *newstats;
1200 struct nft_stats *stats;
1203 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy,
1206 return ERR_PTR(err);
1208 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1209 return ERR_PTR(-EINVAL);
1211 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1212 if (newstats == NULL)
1213 return ERR_PTR(-ENOMEM);
1215 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1216 * are not exposed to userspace.
1219 stats = this_cpu_ptr(newstats);
1220 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1221 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1227 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1228 struct nft_stats __percpu *newstats)
1230 if (newstats == NULL)
1234 struct nft_stats __percpu *oldstats =
1235 nft_dereference(chain->stats);
1237 rcu_assign_pointer(chain->stats, newstats);
1239 free_percpu(oldstats);
1241 rcu_assign_pointer(chain->stats, newstats);
1244 static void nf_tables_chain_destroy(struct nft_chain *chain)
1246 BUG_ON(chain->use > 0);
1248 if (nft_is_base_chain(chain)) {
1249 struct nft_base_chain *basechain = nft_base_chain(chain);
1251 module_put(basechain->type->owner);
1252 free_percpu(basechain->stats);
1253 if (basechain->stats)
1254 static_branch_dec(&nft_counters_enabled);
1255 if (basechain->ops[0].dev != NULL)
1256 dev_put(basechain->ops[0].dev);
1265 struct nft_chain_hook {
1268 const struct nf_chain_type *type;
1269 struct net_device *dev;
1272 static int nft_chain_parse_hook(struct net *net,
1273 const struct nlattr * const nla[],
1274 struct nft_af_info *afi,
1275 struct nft_chain_hook *hook, bool create)
1277 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1278 const struct nf_chain_type *type;
1279 struct net_device *dev;
1282 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1283 nft_hook_policy, NULL);
1287 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1288 ha[NFTA_HOOK_PRIORITY] == NULL)
1291 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1292 if (hook->num >= afi->nhooks)
1295 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1297 type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT];
1298 if (nla[NFTA_CHAIN_TYPE]) {
1299 type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE],
1302 return PTR_ERR(type);
1304 if (!(type->hook_mask & (1 << hook->num)))
1306 if (!try_module_get(type->owner))
1312 if (afi->flags & NFT_AF_NEEDS_DEV) {
1313 char ifname[IFNAMSIZ];
1315 if (!ha[NFTA_HOOK_DEV]) {
1316 module_put(type->owner);
1320 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1321 dev = dev_get_by_name(net, ifname);
1323 module_put(type->owner);
1327 } else if (ha[NFTA_HOOK_DEV]) {
1328 module_put(type->owner);
1335 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1337 module_put(hook->type->owner);
1338 if (hook->dev != NULL)
1342 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1343 u8 policy, bool create)
1345 const struct nlattr * const *nla = ctx->nla;
1346 struct nft_table *table = ctx->table;
1347 struct nft_af_info *afi = ctx->afi;
1348 struct nft_base_chain *basechain;
1349 struct nft_stats __percpu *stats;
1350 struct net *net = ctx->net;
1351 struct nft_chain *chain;
1355 if (table->use == UINT_MAX)
1358 if (nla[NFTA_CHAIN_HOOK]) {
1359 struct nft_chain_hook hook;
1360 struct nf_hook_ops *ops;
1363 err = nft_chain_parse_hook(net, nla, afi, &hook, create);
1367 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1368 if (basechain == NULL) {
1369 nft_chain_release_hook(&hook);
1373 if (hook.dev != NULL)
1374 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1376 if (nla[NFTA_CHAIN_COUNTERS]) {
1377 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1378 if (IS_ERR(stats)) {
1379 nft_chain_release_hook(&hook);
1381 return PTR_ERR(stats);
1383 basechain->stats = stats;
1384 static_branch_inc(&nft_counters_enabled);
1387 hookfn = hook.type->hooks[hook.num];
1388 basechain->type = hook.type;
1389 chain = &basechain->chain;
1391 for (i = 0; i < afi->nops; i++) {
1392 ops = &basechain->ops[i];
1394 ops->hooknum = hook.num;
1395 ops->priority = hook.priority;
1397 ops->hook = afi->hooks[ops->hooknum];
1398 ops->dev = hook.dev;
1401 if (afi->hook_ops_init)
1402 afi->hook_ops_init(ops, i);
1405 chain->flags |= NFT_BASE_CHAIN;
1406 basechain->policy = policy;
1408 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1412 INIT_LIST_HEAD(&chain->rules);
1413 chain->handle = nf_tables_alloc_handle(table);
1414 chain->table = table;
1415 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1421 err = nf_tables_register_hooks(net, table, chain, afi->nops);
1426 err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1431 list_add_tail_rcu(&chain->list, &table->chains);
1435 nf_tables_unregister_hooks(net, table, chain, afi->nops);
1437 nf_tables_chain_destroy(chain);
1442 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
1445 const struct nlattr * const *nla = ctx->nla;
1446 struct nft_table *table = ctx->table;
1447 struct nft_chain *chain = ctx->chain;
1448 struct nft_af_info *afi = ctx->afi;
1449 struct nft_base_chain *basechain;
1450 struct nft_stats *stats = NULL;
1451 struct nft_chain_hook hook;
1452 const struct nlattr *name;
1453 struct nf_hook_ops *ops;
1454 struct nft_trans *trans;
1457 if (nla[NFTA_CHAIN_HOOK]) {
1458 if (!nft_is_base_chain(chain))
1461 err = nft_chain_parse_hook(ctx->net, nla, ctx->afi, &hook,
1466 basechain = nft_base_chain(chain);
1467 if (basechain->type != hook.type) {
1468 nft_chain_release_hook(&hook);
1472 for (i = 0; i < afi->nops; i++) {
1473 ops = &basechain->ops[i];
1474 if (ops->hooknum != hook.num ||
1475 ops->priority != hook.priority ||
1476 ops->dev != hook.dev) {
1477 nft_chain_release_hook(&hook);
1481 nft_chain_release_hook(&hook);
1484 if (nla[NFTA_CHAIN_HANDLE] &&
1485 nla[NFTA_CHAIN_NAME]) {
1486 struct nft_chain *chain2;
1488 chain2 = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME],
1490 if (!IS_ERR(chain2))
1494 if (nla[NFTA_CHAIN_COUNTERS]) {
1495 if (!nft_is_base_chain(chain))
1498 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1500 return PTR_ERR(stats);
1503 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
1504 sizeof(struct nft_trans_chain));
1505 if (trans == NULL) {
1510 nft_trans_chain_stats(trans) = stats;
1511 nft_trans_chain_update(trans) = true;
1513 if (nla[NFTA_CHAIN_POLICY])
1514 nft_trans_chain_policy(trans) = policy;
1516 nft_trans_chain_policy(trans) = -1;
1518 name = nla[NFTA_CHAIN_NAME];
1519 if (nla[NFTA_CHAIN_HANDLE] && name) {
1520 nft_trans_chain_name(trans) =
1521 nla_strdup(name, GFP_KERNEL);
1522 if (!nft_trans_chain_name(trans)) {
1528 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1533 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1534 struct sk_buff *skb, const struct nlmsghdr *nlh,
1535 const struct nlattr * const nla[],
1536 struct netlink_ext_ack *extack)
1538 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1539 const struct nlattr * uninitialized_var(name);
1540 u8 genmask = nft_genmask_next(net);
1541 int family = nfmsg->nfgen_family;
1542 struct nft_af_info *afi;
1543 struct nft_table *table;
1544 struct nft_chain *chain;
1545 u8 policy = NF_ACCEPT;
1550 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1552 afi = nf_tables_afinfo_lookup(net, family, true);
1554 return PTR_ERR(afi);
1556 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1558 return PTR_ERR(table);
1561 name = nla[NFTA_CHAIN_NAME];
1563 if (nla[NFTA_CHAIN_HANDLE]) {
1564 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1565 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
1567 return PTR_ERR(chain);
1569 chain = nf_tables_chain_lookup(table, name, genmask);
1570 if (IS_ERR(chain)) {
1571 if (PTR_ERR(chain) != -ENOENT)
1572 return PTR_ERR(chain);
1577 if (nla[NFTA_CHAIN_POLICY]) {
1578 if (chain != NULL &&
1579 !nft_is_base_chain(chain))
1582 if (chain == NULL &&
1583 nla[NFTA_CHAIN_HOOK] == NULL)
1586 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1596 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1598 if (chain != NULL) {
1599 if (nlh->nlmsg_flags & NLM_F_EXCL)
1601 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1604 return nf_tables_updchain(&ctx, genmask, policy, create);
1607 return nf_tables_addchain(&ctx, family, genmask, policy, create);
1610 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1611 struct sk_buff *skb, const struct nlmsghdr *nlh,
1612 const struct nlattr * const nla[],
1613 struct netlink_ext_ack *extack)
1615 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1616 u8 genmask = nft_genmask_next(net);
1617 struct nft_af_info *afi;
1618 struct nft_table *table;
1619 struct nft_chain *chain;
1620 struct nft_rule *rule;
1621 int family = nfmsg->nfgen_family;
1626 afi = nf_tables_afinfo_lookup(net, family, false);
1628 return PTR_ERR(afi);
1630 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1632 return PTR_ERR(table);
1634 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1636 return PTR_ERR(chain);
1638 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1642 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1645 list_for_each_entry(rule, &chain->rules, list) {
1646 if (!nft_is_active_next(net, rule))
1650 err = nft_delrule(&ctx, rule);
1655 /* There are rules and elements that are still holding references to us,
1656 * we cannot do a recursive removal in this case.
1661 return nft_delchain(&ctx);
1669 * nft_register_expr - register nf_tables expr type
1672 * Registers the expr type for use with nf_tables. Returns zero on
1673 * success or a negative errno code otherwise.
1675 int nft_register_expr(struct nft_expr_type *type)
1677 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1678 if (type->family == NFPROTO_UNSPEC)
1679 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1681 list_add_rcu(&type->list, &nf_tables_expressions);
1682 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1685 EXPORT_SYMBOL_GPL(nft_register_expr);
1688 * nft_unregister_expr - unregister nf_tables expr type
1691 * Unregisters the expr typefor use with nf_tables.
1693 void nft_unregister_expr(struct nft_expr_type *type)
1695 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1696 list_del_rcu(&type->list);
1697 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1699 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1701 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1704 const struct nft_expr_type *type;
1706 list_for_each_entry(type, &nf_tables_expressions, list) {
1707 if (!nla_strcmp(nla, type->name) &&
1708 (!type->family || type->family == family))
1714 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1717 const struct nft_expr_type *type;
1720 return ERR_PTR(-EINVAL);
1722 type = __nft_expr_type_get(family, nla);
1723 if (type != NULL && try_module_get(type->owner))
1726 #ifdef CONFIG_MODULES
1728 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1729 request_module("nft-expr-%u-%.*s", family,
1730 nla_len(nla), (char *)nla_data(nla));
1731 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1732 if (__nft_expr_type_get(family, nla))
1733 return ERR_PTR(-EAGAIN);
1735 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1736 request_module("nft-expr-%.*s",
1737 nla_len(nla), (char *)nla_data(nla));
1738 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1739 if (__nft_expr_type_get(family, nla))
1740 return ERR_PTR(-EAGAIN);
1743 return ERR_PTR(-ENOENT);
1746 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1747 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1748 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1751 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1752 const struct nft_expr *expr)
1754 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1755 goto nla_put_failure;
1757 if (expr->ops->dump) {
1758 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1760 goto nla_put_failure;
1761 if (expr->ops->dump(skb, expr) < 0)
1762 goto nla_put_failure;
1763 nla_nest_end(skb, data);
1772 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1773 const struct nft_expr *expr)
1775 struct nlattr *nest;
1777 nest = nla_nest_start(skb, attr);
1779 goto nla_put_failure;
1780 if (nf_tables_fill_expr_info(skb, expr) < 0)
1781 goto nla_put_failure;
1782 nla_nest_end(skb, nest);
1789 struct nft_expr_info {
1790 const struct nft_expr_ops *ops;
1791 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1794 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1795 const struct nlattr *nla,
1796 struct nft_expr_info *info)
1798 const struct nft_expr_type *type;
1799 const struct nft_expr_ops *ops;
1800 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1803 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL);
1807 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1809 return PTR_ERR(type);
1811 if (tb[NFTA_EXPR_DATA]) {
1812 err = nla_parse_nested(info->tb, type->maxattr,
1813 tb[NFTA_EXPR_DATA], type->policy, NULL);
1817 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1819 if (type->select_ops != NULL) {
1820 ops = type->select_ops(ctx,
1821 (const struct nlattr * const *)info->tb);
1833 module_put(type->owner);
1837 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1838 const struct nft_expr_info *info,
1839 struct nft_expr *expr)
1841 const struct nft_expr_ops *ops = info->ops;
1846 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1851 if (ops->validate) {
1852 const struct nft_data *data = NULL;
1854 err = ops->validate(ctx, expr, &data);
1863 ops->destroy(ctx, expr);
1869 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1870 struct nft_expr *expr)
1872 if (expr->ops->destroy)
1873 expr->ops->destroy(ctx, expr);
1874 module_put(expr->ops->type->owner);
1877 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1878 const struct nlattr *nla)
1880 struct nft_expr_info info;
1881 struct nft_expr *expr;
1884 err = nf_tables_expr_parse(ctx, nla, &info);
1889 expr = kzalloc(info.ops->size, GFP_KERNEL);
1893 err = nf_tables_newexpr(ctx, &info, expr);
1901 module_put(info.ops->type->owner);
1903 return ERR_PTR(err);
1906 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1908 nf_tables_expr_destroy(ctx, expr);
1916 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1919 struct nft_rule *rule;
1921 // FIXME: this sucks
1922 list_for_each_entry(rule, &chain->rules, list) {
1923 if (handle == rule->handle)
1927 return ERR_PTR(-ENOENT);
1930 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1931 const struct nlattr *nla)
1934 return ERR_PTR(-EINVAL);
1936 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1939 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1940 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
1941 .len = NFT_TABLE_MAXNAMELEN - 1 },
1942 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1943 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1944 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1945 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1946 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1947 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1948 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1949 .len = NFT_USERDATA_MAXLEN },
1952 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1953 u32 portid, u32 seq, int event,
1954 u32 flags, int family,
1955 const struct nft_table *table,
1956 const struct nft_chain *chain,
1957 const struct nft_rule *rule)
1959 struct nlmsghdr *nlh;
1960 struct nfgenmsg *nfmsg;
1961 const struct nft_expr *expr, *next;
1962 struct nlattr *list;
1963 const struct nft_rule *prule;
1964 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1966 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
1968 goto nla_put_failure;
1970 nfmsg = nlmsg_data(nlh);
1971 nfmsg->nfgen_family = family;
1972 nfmsg->version = NFNETLINK_V0;
1973 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1975 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1976 goto nla_put_failure;
1977 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1978 goto nla_put_failure;
1979 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1981 goto nla_put_failure;
1983 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1984 prule = list_prev_entry(rule, list);
1985 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1986 cpu_to_be64(prule->handle),
1988 goto nla_put_failure;
1991 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1993 goto nla_put_failure;
1994 nft_rule_for_each_expr(expr, next, rule) {
1995 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
1996 goto nla_put_failure;
1998 nla_nest_end(skb, list);
2001 struct nft_userdata *udata = nft_userdata(rule);
2002 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2004 goto nla_put_failure;
2007 nlmsg_end(skb, nlh);
2011 nlmsg_trim(skb, nlh);
2015 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2016 const struct nft_rule *rule, int event)
2018 struct sk_buff *skb;
2022 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2025 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2029 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2030 event, 0, ctx->afi->family, ctx->table,
2037 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2038 ctx->report, GFP_KERNEL);
2041 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2044 struct nft_rule_dump_ctx {
2049 static int nf_tables_dump_rules(struct sk_buff *skb,
2050 struct netlink_callback *cb)
2052 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2053 const struct nft_rule_dump_ctx *ctx = cb->data;
2054 const struct nft_af_info *afi;
2055 const struct nft_table *table;
2056 const struct nft_chain *chain;
2057 const struct nft_rule *rule;
2058 unsigned int idx = 0, s_idx = cb->args[0];
2059 struct net *net = sock_net(skb->sk);
2060 int family = nfmsg->nfgen_family;
2063 cb->seq = net->nft.base_seq;
2065 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2066 if (family != NFPROTO_UNSPEC && family != afi->family)
2069 list_for_each_entry_rcu(table, &afi->tables, list) {
2070 if (ctx && ctx->table &&
2071 strcmp(ctx->table, table->name) != 0)
2074 list_for_each_entry_rcu(chain, &table->chains, list) {
2075 if (ctx && ctx->chain[0] &&
2076 strcmp(ctx->chain, chain->name) != 0)
2079 list_for_each_entry_rcu(rule, &chain->rules, list) {
2080 if (!nft_is_active(net, rule))
2085 memset(&cb->args[1], 0,
2086 sizeof(cb->args) - sizeof(cb->args[0]));
2087 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2090 NLM_F_MULTI | NLM_F_APPEND,
2091 afi->family, table, chain, rule) < 0)
2094 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2108 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2110 struct nft_rule_dump_ctx *ctx = cb->data;
2120 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2121 struct sk_buff *skb, const struct nlmsghdr *nlh,
2122 const struct nlattr * const nla[],
2123 struct netlink_ext_ack *extack)
2125 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2126 u8 genmask = nft_genmask_cur(net);
2127 const struct nft_af_info *afi;
2128 const struct nft_table *table;
2129 const struct nft_chain *chain;
2130 const struct nft_rule *rule;
2131 struct sk_buff *skb2;
2132 int family = nfmsg->nfgen_family;
2135 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2136 struct netlink_dump_control c = {
2137 .dump = nf_tables_dump_rules,
2138 .done = nf_tables_dump_rules_done,
2141 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2142 struct nft_rule_dump_ctx *ctx;
2144 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
2148 if (nla[NFTA_RULE_TABLE]) {
2149 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2156 if (nla[NFTA_RULE_CHAIN]) {
2157 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2168 return netlink_dump_start(nlsk, skb, nlh, &c);
2171 afi = nf_tables_afinfo_lookup(net, family, false);
2173 return PTR_ERR(afi);
2175 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2177 return PTR_ERR(table);
2179 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2181 return PTR_ERR(chain);
2183 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2185 return PTR_ERR(rule);
2187 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2191 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2192 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2193 family, table, chain, rule);
2197 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2204 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2205 struct nft_rule *rule)
2207 struct nft_expr *expr;
2210 * Careful: some expressions might not be initialized in case this
2211 * is called on error from nf_tables_newrule().
2213 expr = nft_expr_first(rule);
2214 while (expr != nft_expr_last(rule) && expr->ops) {
2215 nf_tables_expr_destroy(ctx, expr);
2216 expr = nft_expr_next(expr);
2221 #define NFT_RULE_MAXEXPRS 128
2223 static struct nft_expr_info *info;
2225 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2226 struct sk_buff *skb, const struct nlmsghdr *nlh,
2227 const struct nlattr * const nla[],
2228 struct netlink_ext_ack *extack)
2230 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2231 u8 genmask = nft_genmask_next(net);
2232 struct nft_af_info *afi;
2233 struct nft_table *table;
2234 struct nft_chain *chain;
2235 struct nft_rule *rule, *old_rule = NULL;
2236 struct nft_userdata *udata;
2237 struct nft_trans *trans = NULL;
2238 struct nft_expr *expr;
2241 unsigned int size, i, n, ulen = 0, usize = 0;
2244 u64 handle, pos_handle;
2246 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2248 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2250 return PTR_ERR(afi);
2252 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2254 return PTR_ERR(table);
2256 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2258 return PTR_ERR(chain);
2260 if (nla[NFTA_RULE_HANDLE]) {
2261 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2262 rule = __nf_tables_rule_lookup(chain, handle);
2264 return PTR_ERR(rule);
2266 if (nlh->nlmsg_flags & NLM_F_EXCL)
2268 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2273 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2275 handle = nf_tables_alloc_handle(table);
2277 if (chain->use == UINT_MAX)
2281 if (nla[NFTA_RULE_POSITION]) {
2282 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2285 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2286 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2287 if (IS_ERR(old_rule))
2288 return PTR_ERR(old_rule);
2291 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2295 if (nla[NFTA_RULE_EXPRESSIONS]) {
2296 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2298 if (nla_type(tmp) != NFTA_LIST_ELEM)
2300 if (n == NFT_RULE_MAXEXPRS)
2302 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2305 size += info[n].ops->size;
2309 /* Check for overflow of dlen field */
2311 if (size >= 1 << 12)
2314 if (nla[NFTA_RULE_USERDATA]) {
2315 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2317 usize = sizeof(struct nft_userdata) + ulen;
2321 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2325 nft_activate_next(net, rule);
2327 rule->handle = handle;
2329 rule->udata = ulen ? 1 : 0;
2332 udata = nft_userdata(rule);
2333 udata->len = ulen - 1;
2334 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2337 expr = nft_expr_first(rule);
2338 for (i = 0; i < n; i++) {
2339 err = nf_tables_newexpr(&ctx, &info[i], expr);
2343 expr = nft_expr_next(expr);
2346 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2347 if (nft_is_active_next(net, old_rule)) {
2348 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2350 if (trans == NULL) {
2354 nft_deactivate_next(net, old_rule);
2356 list_add_tail_rcu(&rule->list, &old_rule->list);
2361 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2363 list_add_rcu(&rule->list, &old_rule->list);
2365 list_add_tail_rcu(&rule->list, &chain->rules);
2368 list_add_tail_rcu(&rule->list, &old_rule->list);
2370 list_add_rcu(&rule->list, &chain->rules);
2373 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2381 list_del_rcu(&rule->list);
2383 nf_tables_rule_destroy(&ctx, rule);
2385 for (i = 0; i < n; i++) {
2386 if (info[i].ops != NULL)
2387 module_put(info[i].ops->type->owner);
2392 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2393 const struct nlattr *nla)
2395 u32 id = ntohl(nla_get_be32(nla));
2396 struct nft_trans *trans;
2398 list_for_each_entry(trans, &net->nft.commit_list, list) {
2399 struct nft_rule *rule = nft_trans_rule(trans);
2401 if (trans->msg_type == NFT_MSG_NEWRULE &&
2402 id == nft_trans_rule_id(trans))
2405 return ERR_PTR(-ENOENT);
2408 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2409 struct sk_buff *skb, const struct nlmsghdr *nlh,
2410 const struct nlattr * const nla[],
2411 struct netlink_ext_ack *extack)
2413 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2414 u8 genmask = nft_genmask_next(net);
2415 struct nft_af_info *afi;
2416 struct nft_table *table;
2417 struct nft_chain *chain = NULL;
2418 struct nft_rule *rule;
2419 int family = nfmsg->nfgen_family, err = 0;
2422 afi = nf_tables_afinfo_lookup(net, family, false);
2424 return PTR_ERR(afi);
2426 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2428 return PTR_ERR(table);
2430 if (nla[NFTA_RULE_CHAIN]) {
2431 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2434 return PTR_ERR(chain);
2437 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2440 if (nla[NFTA_RULE_HANDLE]) {
2441 rule = nf_tables_rule_lookup(chain,
2442 nla[NFTA_RULE_HANDLE]);
2444 return PTR_ERR(rule);
2446 err = nft_delrule(&ctx, rule);
2447 } else if (nla[NFTA_RULE_ID]) {
2448 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2450 return PTR_ERR(rule);
2452 err = nft_delrule(&ctx, rule);
2454 err = nft_delrule_by_chain(&ctx);
2457 list_for_each_entry(chain, &table->chains, list) {
2458 if (!nft_is_active_next(net, chain))
2462 err = nft_delrule_by_chain(&ctx);
2475 static LIST_HEAD(nf_tables_set_types);
2477 int nft_register_set(struct nft_set_type *type)
2479 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2480 list_add_tail_rcu(&type->list, &nf_tables_set_types);
2481 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2484 EXPORT_SYMBOL_GPL(nft_register_set);
2486 void nft_unregister_set(struct nft_set_type *type)
2488 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2489 list_del_rcu(&type->list);
2490 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2492 EXPORT_SYMBOL_GPL(nft_unregister_set);
2494 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
2495 NFT_SET_TIMEOUT | NFT_SET_OBJECT)
2497 static bool nft_set_ops_candidate(const struct nft_set_ops *ops, u32 flags)
2499 return (flags & ops->features) == (flags & NFT_SET_FEATURES);
2503 * Select a set implementation based on the data characteristics and the
2504 * given policy. The total memory use might not be known if no size is
2505 * given, in that case the amount of memory per element is used.
2507 static const struct nft_set_ops *
2508 nft_select_set_ops(const struct nft_ctx *ctx,
2509 const struct nlattr * const nla[],
2510 const struct nft_set_desc *desc,
2511 enum nft_set_policies policy)
2513 const struct nft_set_ops *ops, *bops;
2514 struct nft_set_estimate est, best;
2515 const struct nft_set_type *type;
2518 #ifdef CONFIG_MODULES
2519 if (list_empty(&nf_tables_set_types)) {
2520 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2521 request_module("nft-set");
2522 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2523 if (!list_empty(&nf_tables_set_types))
2524 return ERR_PTR(-EAGAIN);
2527 if (nla[NFTA_SET_FLAGS] != NULL)
2528 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2535 list_for_each_entry(type, &nf_tables_set_types, list) {
2536 if (!type->select_ops)
2539 ops = type->select_ops(ctx, desc, flags);
2543 if (!nft_set_ops_candidate(ops, flags))
2545 if (!ops->estimate(desc, flags, &est))
2549 case NFT_SET_POL_PERFORMANCE:
2550 if (est.lookup < best.lookup)
2552 if (est.lookup == best.lookup &&
2553 est.space < best.space)
2556 case NFT_SET_POL_MEMORY:
2558 if (est.space < best.space)
2560 if (est.space == best.space &&
2561 est.lookup < best.lookup)
2563 } else if (est.size < best.size) {
2571 if (!try_module_get(type->owner))
2574 module_put(bops->type->owner);
2583 return ERR_PTR(-EOPNOTSUPP);
2586 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2587 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2588 .len = NFT_TABLE_MAXNAMELEN - 1 },
2589 [NFTA_SET_NAME] = { .type = NLA_STRING,
2590 .len = NFT_SET_MAXNAMELEN - 1 },
2591 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2592 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2593 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2594 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2595 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2596 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2597 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2598 [NFTA_SET_ID] = { .type = NLA_U32 },
2599 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2600 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2601 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2602 .len = NFT_USERDATA_MAXLEN },
2603 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
2606 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2607 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2610 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2611 const struct sk_buff *skb,
2612 const struct nlmsghdr *nlh,
2613 const struct nlattr * const nla[],
2616 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2617 struct nft_af_info *afi = NULL;
2618 struct nft_table *table = NULL;
2620 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2621 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2623 return PTR_ERR(afi);
2626 if (nla[NFTA_SET_TABLE] != NULL) {
2628 return -EAFNOSUPPORT;
2630 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2633 return PTR_ERR(table);
2636 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
2640 static struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2641 const struct nlattr *nla, u8 genmask)
2643 struct nft_set *set;
2646 return ERR_PTR(-EINVAL);
2648 list_for_each_entry(set, &table->sets, list) {
2649 if (!nla_strcmp(nla, set->name) &&
2650 nft_active_genmask(set, genmask))
2653 return ERR_PTR(-ENOENT);
2656 static struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2657 const struct nlattr *nla,
2660 struct nft_trans *trans;
2661 u32 id = ntohl(nla_get_be32(nla));
2663 list_for_each_entry(trans, &net->nft.commit_list, list) {
2664 struct nft_set *set = nft_trans_set(trans);
2666 if (trans->msg_type == NFT_MSG_NEWSET &&
2667 id == nft_trans_set_id(trans) &&
2668 nft_active_genmask(set, genmask))
2671 return ERR_PTR(-ENOENT);
2674 struct nft_set *nft_set_lookup(const struct net *net,
2675 const struct nft_table *table,
2676 const struct nlattr *nla_set_name,
2677 const struct nlattr *nla_set_id,
2680 struct nft_set *set;
2682 set = nf_tables_set_lookup(table, nla_set_name, genmask);
2687 set = nf_tables_set_lookup_byid(net, nla_set_id, genmask);
2691 EXPORT_SYMBOL_GPL(nft_set_lookup);
2693 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2696 const struct nft_set *i;
2698 unsigned long *inuse;
2699 unsigned int n = 0, min = 0;
2701 p = strchr(name, '%');
2703 if (p[1] != 'd' || strchr(p + 2, '%'))
2706 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2710 list_for_each_entry(i, &ctx->table->sets, list) {
2713 if (!nft_is_active_next(ctx->net, set))
2715 if (!sscanf(i->name, name, &tmp))
2717 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2720 set_bit(tmp - min, inuse);
2723 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2724 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2725 min += BITS_PER_BYTE * PAGE_SIZE;
2726 memset(inuse, 0, PAGE_SIZE);
2729 free_page((unsigned long)inuse);
2732 set->name = kasprintf(GFP_KERNEL, name, min + n);
2736 list_for_each_entry(i, &ctx->table->sets, list) {
2737 if (!nft_is_active_next(ctx->net, i))
2739 if (!strcmp(set->name, i->name)) {
2747 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2748 const struct nft_set *set, u16 event, u16 flags)
2750 struct nfgenmsg *nfmsg;
2751 struct nlmsghdr *nlh;
2752 struct nlattr *desc;
2753 u32 portid = ctx->portid;
2756 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2757 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2760 goto nla_put_failure;
2762 nfmsg = nlmsg_data(nlh);
2763 nfmsg->nfgen_family = ctx->afi->family;
2764 nfmsg->version = NFNETLINK_V0;
2765 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2767 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2768 goto nla_put_failure;
2769 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2770 goto nla_put_failure;
2771 if (set->flags != 0)
2772 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2773 goto nla_put_failure;
2775 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2776 goto nla_put_failure;
2777 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2778 goto nla_put_failure;
2779 if (set->flags & NFT_SET_MAP) {
2780 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2781 goto nla_put_failure;
2782 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2783 goto nla_put_failure;
2785 if (set->flags & NFT_SET_OBJECT &&
2786 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
2787 goto nla_put_failure;
2790 nla_put_be64(skb, NFTA_SET_TIMEOUT,
2791 cpu_to_be64(jiffies_to_msecs(set->timeout)),
2793 goto nla_put_failure;
2795 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2796 goto nla_put_failure;
2798 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2799 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2800 goto nla_put_failure;
2803 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2804 goto nla_put_failure;
2806 desc = nla_nest_start(skb, NFTA_SET_DESC);
2808 goto nla_put_failure;
2810 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2811 goto nla_put_failure;
2812 nla_nest_end(skb, desc);
2814 nlmsg_end(skb, nlh);
2818 nlmsg_trim(skb, nlh);
2822 static void nf_tables_set_notify(const struct nft_ctx *ctx,
2823 const struct nft_set *set, int event,
2826 struct sk_buff *skb;
2827 u32 portid = ctx->portid;
2831 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2834 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2838 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2844 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
2848 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
2851 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2853 const struct nft_set *set;
2854 unsigned int idx, s_idx = cb->args[0];
2855 struct nft_af_info *afi;
2856 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2857 struct net *net = sock_net(skb->sk);
2858 int cur_family = cb->args[3];
2859 struct nft_ctx *ctx = cb->data, ctx_set;
2865 cb->seq = net->nft.base_seq;
2867 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2868 if (ctx->afi && ctx->afi != afi)
2872 if (afi->family != cur_family)
2877 list_for_each_entry_rcu(table, &afi->tables, list) {
2878 if (ctx->table && ctx->table != table)
2882 if (cur_table != table)
2888 list_for_each_entry_rcu(set, &table->sets, list) {
2891 if (!nft_is_active(net, set))
2895 ctx_set.table = table;
2897 if (nf_tables_fill_set(skb, &ctx_set, set,
2901 cb->args[2] = (unsigned long) table;
2902 cb->args[3] = afi->family;
2905 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2919 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2925 static int nf_tables_getset(struct net *net, struct sock *nlsk,
2926 struct sk_buff *skb, const struct nlmsghdr *nlh,
2927 const struct nlattr * const nla[],
2928 struct netlink_ext_ack *extack)
2930 u8 genmask = nft_genmask_cur(net);
2931 const struct nft_set *set;
2933 struct sk_buff *skb2;
2934 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2937 /* Verify existence before starting dump */
2938 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
2942 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2943 struct netlink_dump_control c = {
2944 .dump = nf_tables_dump_sets,
2945 .done = nf_tables_dump_sets_done,
2947 struct nft_ctx *ctx_dump;
2949 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2950 if (ctx_dump == NULL)
2956 return netlink_dump_start(nlsk, skb, nlh, &c);
2959 /* Only accept unspec with dump */
2960 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2961 return -EAFNOSUPPORT;
2962 if (!nla[NFTA_SET_TABLE])
2965 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
2967 return PTR_ERR(set);
2969 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2973 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2977 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2984 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2985 struct nft_set_desc *desc,
2986 const struct nlattr *nla)
2988 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2991 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
2992 nft_set_desc_policy, NULL);
2996 if (da[NFTA_SET_DESC_SIZE] != NULL)
2997 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
3002 static int nf_tables_newset(struct net *net, struct sock *nlsk,
3003 struct sk_buff *skb, const struct nlmsghdr *nlh,
3004 const struct nlattr * const nla[],
3005 struct netlink_ext_ack *extack)
3007 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3008 u8 genmask = nft_genmask_next(net);
3009 const struct nft_set_ops *ops;
3010 struct nft_af_info *afi;
3011 struct nft_table *table;
3012 struct nft_set *set;
3018 u32 ktype, dtype, flags, policy, gc_int, objtype;
3019 struct nft_set_desc desc;
3020 unsigned char *udata;
3024 if (nla[NFTA_SET_TABLE] == NULL ||
3025 nla[NFTA_SET_NAME] == NULL ||
3026 nla[NFTA_SET_KEY_LEN] == NULL ||
3027 nla[NFTA_SET_ID] == NULL)
3030 memset(&desc, 0, sizeof(desc));
3032 ktype = NFT_DATA_VALUE;
3033 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3034 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3035 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3039 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
3040 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
3044 if (nla[NFTA_SET_FLAGS] != NULL) {
3045 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3046 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
3047 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
3048 NFT_SET_MAP | NFT_SET_EVAL |
3051 /* Only one of these operations is supported */
3052 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3053 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
3058 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3059 if (!(flags & NFT_SET_MAP))
3062 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3063 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3064 dtype != NFT_DATA_VERDICT)
3067 if (dtype != NFT_DATA_VERDICT) {
3068 if (nla[NFTA_SET_DATA_LEN] == NULL)
3070 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
3071 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
3074 desc.dlen = sizeof(struct nft_verdict);
3075 } else if (flags & NFT_SET_MAP)
3078 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3079 if (!(flags & NFT_SET_OBJECT))
3082 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3083 if (objtype == NFT_OBJECT_UNSPEC ||
3084 objtype > NFT_OBJECT_MAX)
3086 } else if (flags & NFT_SET_OBJECT)
3089 objtype = NFT_OBJECT_UNSPEC;
3092 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3093 if (!(flags & NFT_SET_TIMEOUT))
3095 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3096 nla[NFTA_SET_TIMEOUT])));
3099 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3100 if (!(flags & NFT_SET_TIMEOUT))
3102 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3105 policy = NFT_SET_POL_PERFORMANCE;
3106 if (nla[NFTA_SET_POLICY] != NULL)
3107 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3109 if (nla[NFTA_SET_DESC] != NULL) {
3110 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
3115 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
3117 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
3119 return PTR_ERR(afi);
3121 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
3123 return PTR_ERR(table);
3125 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
3127 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
3129 if (PTR_ERR(set) != -ENOENT)
3130 return PTR_ERR(set);
3132 if (nlh->nlmsg_flags & NLM_F_EXCL)
3134 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3139 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3142 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
3144 return PTR_ERR(ops);
3147 if (nla[NFTA_SET_USERDATA])
3148 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3151 if (ops->privsize != NULL)
3152 size = ops->privsize(nla, &desc);
3154 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3160 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3166 err = nf_tables_set_alloc_name(&ctx, set, name);
3173 udata = set->data + size;
3174 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3177 INIT_LIST_HEAD(&set->bindings);
3180 set->klen = desc.klen;
3182 set->objtype = objtype;
3183 set->dlen = desc.dlen;
3185 set->size = desc.size;
3186 set->policy = policy;
3189 set->timeout = timeout;
3190 set->gc_int = gc_int;
3192 err = ops->init(set, &desc, nla);
3196 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3200 list_add_tail_rcu(&set->list, &table->sets);
3209 module_put(ops->type->owner);
3213 static void nft_set_destroy(struct nft_set *set)
3215 set->ops->destroy(set);
3216 module_put(set->ops->type->owner);
3221 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3223 list_del_rcu(&set->list);
3224 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
3225 nft_set_destroy(set);
3228 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3229 struct sk_buff *skb, const struct nlmsghdr *nlh,
3230 const struct nlattr * const nla[],
3231 struct netlink_ext_ack *extack)
3233 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3234 u8 genmask = nft_genmask_next(net);
3235 struct nft_set *set;
3239 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3240 return -EAFNOSUPPORT;
3241 if (nla[NFTA_SET_TABLE] == NULL)
3244 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
3248 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3250 return PTR_ERR(set);
3252 if (!list_empty(&set->bindings) ||
3253 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0))
3256 return nft_delset(&ctx, set);
3259 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3260 struct nft_set *set,
3261 const struct nft_set_iter *iter,
3262 struct nft_set_elem *elem)
3264 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3265 enum nft_registers dreg;
3267 dreg = nft_type_to_reg(set->dtype);
3268 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3269 set->dtype == NFT_DATA_VERDICT ?
3270 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3274 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3275 struct nft_set_binding *binding)
3277 struct nft_set_binding *i;
3278 struct nft_set_iter iter;
3280 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
3283 if (binding->flags & NFT_SET_MAP) {
3284 /* If the set is already bound to the same chain all
3285 * jumps are already validated for that chain.
3287 list_for_each_entry(i, &set->bindings, list) {
3288 if (i->flags & NFT_SET_MAP &&
3289 i->chain == binding->chain)
3293 iter.genmask = nft_genmask_next(ctx->net);
3297 iter.fn = nf_tables_bind_check_setelem;
3299 set->ops->walk(ctx, set, &iter);
3304 binding->chain = ctx->chain;
3305 list_add_tail_rcu(&binding->list, &set->bindings);
3308 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3310 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3311 struct nft_set_binding *binding)
3313 list_del_rcu(&binding->list);
3315 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
3316 nft_is_active(ctx->net, set))
3317 nf_tables_set_destroy(ctx, set);
3319 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3321 const struct nft_set_ext_type nft_set_ext_types[] = {
3322 [NFT_SET_EXT_KEY] = {
3323 .align = __alignof__(u32),
3325 [NFT_SET_EXT_DATA] = {
3326 .align = __alignof__(u32),
3328 [NFT_SET_EXT_EXPR] = {
3329 .align = __alignof__(struct nft_expr),
3331 [NFT_SET_EXT_OBJREF] = {
3332 .len = sizeof(struct nft_object *),
3333 .align = __alignof__(struct nft_object *),
3335 [NFT_SET_EXT_FLAGS] = {
3337 .align = __alignof__(u8),
3339 [NFT_SET_EXT_TIMEOUT] = {
3341 .align = __alignof__(u64),
3343 [NFT_SET_EXT_EXPIRATION] = {
3344 .len = sizeof(unsigned long),
3345 .align = __alignof__(unsigned long),
3347 [NFT_SET_EXT_USERDATA] = {
3348 .len = sizeof(struct nft_userdata),
3349 .align = __alignof__(struct nft_userdata),
3352 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3358 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3359 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3360 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3361 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3362 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3363 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3364 .len = NFT_USERDATA_MAXLEN },
3367 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3368 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3369 .len = NFT_TABLE_MAXNAMELEN - 1 },
3370 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3371 .len = NFT_SET_MAXNAMELEN - 1 },
3372 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3373 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3376 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3377 const struct sk_buff *skb,
3378 const struct nlmsghdr *nlh,
3379 const struct nlattr * const nla[],
3382 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3383 struct nft_af_info *afi;
3384 struct nft_table *table;
3386 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3388 return PTR_ERR(afi);
3390 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3393 return PTR_ERR(table);
3395 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
3399 static int nf_tables_fill_setelem(struct sk_buff *skb,
3400 const struct nft_set *set,
3401 const struct nft_set_elem *elem)
3403 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3404 unsigned char *b = skb_tail_pointer(skb);
3405 struct nlattr *nest;
3407 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3409 goto nla_put_failure;
3411 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3412 NFT_DATA_VALUE, set->klen) < 0)
3413 goto nla_put_failure;
3415 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3416 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3417 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3419 goto nla_put_failure;
3421 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3422 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3423 goto nla_put_failure;
3425 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3426 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3427 (*nft_set_ext_obj(ext))->name) < 0)
3428 goto nla_put_failure;
3430 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3431 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3432 htonl(*nft_set_ext_flags(ext))))
3433 goto nla_put_failure;
3435 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3436 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3437 cpu_to_be64(jiffies_to_msecs(
3438 *nft_set_ext_timeout(ext))),
3440 goto nla_put_failure;
3442 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3443 unsigned long expires, now = jiffies;
3445 expires = *nft_set_ext_expiration(ext);
3446 if (time_before(now, expires))
3451 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3452 cpu_to_be64(jiffies_to_msecs(expires)),
3454 goto nla_put_failure;
3457 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3458 struct nft_userdata *udata;
3460 udata = nft_set_ext_userdata(ext);
3461 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3462 udata->len + 1, udata->data))
3463 goto nla_put_failure;
3466 nla_nest_end(skb, nest);
3474 struct nft_set_dump_args {
3475 const struct netlink_callback *cb;
3476 struct nft_set_iter iter;
3477 struct sk_buff *skb;
3480 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3481 struct nft_set *set,
3482 const struct nft_set_iter *iter,
3483 struct nft_set_elem *elem)
3485 struct nft_set_dump_args *args;
3487 args = container_of(iter, struct nft_set_dump_args, iter);
3488 return nf_tables_fill_setelem(args->skb, set, elem);
3491 struct nft_set_dump_ctx {
3492 const struct nft_set *set;
3496 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3498 struct nft_set_dump_ctx *dump_ctx = cb->data;
3499 struct net *net = sock_net(skb->sk);
3500 struct nft_af_info *afi;
3501 struct nft_table *table;
3502 struct nft_set *set;
3503 struct nft_set_dump_args args;
3504 bool set_found = false;
3505 struct nfgenmsg *nfmsg;
3506 struct nlmsghdr *nlh;
3507 struct nlattr *nest;
3512 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
3513 if (afi != dump_ctx->ctx.afi)
3516 list_for_each_entry_rcu(table, &afi->tables, list) {
3517 if (table != dump_ctx->ctx.table)
3520 list_for_each_entry_rcu(set, &table->sets, list) {
3521 if (set == dump_ctx->set) {
3536 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
3537 portid = NETLINK_CB(cb->skb).portid;
3538 seq = cb->nlh->nlmsg_seq;
3540 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3543 goto nla_put_failure;
3545 nfmsg = nlmsg_data(nlh);
3546 nfmsg->nfgen_family = afi->family;
3547 nfmsg->version = NFNETLINK_V0;
3548 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3550 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
3551 goto nla_put_failure;
3552 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3553 goto nla_put_failure;
3555 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3557 goto nla_put_failure;
3561 args.iter.genmask = nft_genmask_cur(net);
3562 args.iter.skip = cb->args[0];
3563 args.iter.count = 0;
3565 args.iter.fn = nf_tables_dump_setelem;
3566 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
3569 nla_nest_end(skb, nest);
3570 nlmsg_end(skb, nlh);
3572 if (args.iter.err && args.iter.err != -EMSGSIZE)
3573 return args.iter.err;
3574 if (args.iter.count == cb->args[0])
3577 cb->args[0] = args.iter.count;
3585 static int nf_tables_dump_set_done(struct netlink_callback *cb)
3591 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3592 const struct nft_ctx *ctx, u32 seq,
3593 u32 portid, int event, u16 flags,
3594 const struct nft_set *set,
3595 const struct nft_set_elem *elem)
3597 struct nfgenmsg *nfmsg;
3598 struct nlmsghdr *nlh;
3599 struct nlattr *nest;
3602 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3603 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3606 goto nla_put_failure;
3608 nfmsg = nlmsg_data(nlh);
3609 nfmsg->nfgen_family = ctx->afi->family;
3610 nfmsg->version = NFNETLINK_V0;
3611 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3613 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3614 goto nla_put_failure;
3615 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3616 goto nla_put_failure;
3618 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3620 goto nla_put_failure;
3622 err = nf_tables_fill_setelem(skb, set, elem);
3624 goto nla_put_failure;
3626 nla_nest_end(skb, nest);
3628 nlmsg_end(skb, nlh);
3632 nlmsg_trim(skb, nlh);
3636 static int nft_setelem_parse_flags(const struct nft_set *set,
3637 const struct nlattr *attr, u32 *flags)
3642 *flags = ntohl(nla_get_be32(attr));
3643 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3645 if (!(set->flags & NFT_SET_INTERVAL) &&
3646 *flags & NFT_SET_ELEM_INTERVAL_END)
3652 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3653 const struct nlattr *attr)
3655 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3656 const struct nft_set_ext *ext;
3657 struct nft_data_desc desc;
3658 struct nft_set_elem elem;
3659 struct sk_buff *skb;
3664 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3665 nft_set_elem_policy, NULL);
3669 if (!nla[NFTA_SET_ELEM_KEY])
3672 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3676 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3677 nla[NFTA_SET_ELEM_KEY]);
3682 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3685 priv = set->ops->get(ctx->net, set, &elem, flags);
3687 return PTR_ERR(priv);
3690 ext = nft_set_elem_ext(set, &elem);
3693 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3697 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
3698 NFT_MSG_NEWSETELEM, 0, set, &elem);
3702 err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT);
3703 /* This avoids a loop in nfnetlink. */
3711 /* this avoids a loop in nfnetlink. */
3712 return err == -EAGAIN ? -ENOBUFS : err;
3715 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3716 struct sk_buff *skb, const struct nlmsghdr *nlh,
3717 const struct nlattr * const nla[],
3718 struct netlink_ext_ack *extack)
3720 u8 genmask = nft_genmask_cur(net);
3721 struct nft_set *set;
3722 struct nlattr *attr;
3726 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3730 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3733 return PTR_ERR(set);
3735 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3736 struct netlink_dump_control c = {
3737 .dump = nf_tables_dump_set,
3738 .done = nf_tables_dump_set_done,
3740 struct nft_set_dump_ctx *dump_ctx;
3742 dump_ctx = kmalloc(sizeof(*dump_ctx), GFP_KERNEL);
3746 dump_ctx->set = set;
3747 dump_ctx->ctx = ctx;
3750 return netlink_dump_start(nlsk, skb, nlh, &c);
3753 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
3756 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3757 err = nft_get_set_elem(&ctx, set, attr);
3765 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
3766 const struct nft_set *set,
3767 const struct nft_set_elem *elem,
3768 int event, u16 flags)
3770 struct net *net = ctx->net;
3771 u32 portid = ctx->portid;
3772 struct sk_buff *skb;
3775 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3778 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3782 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3789 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3793 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3796 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3798 struct nft_set *set)
3800 struct nft_trans *trans;
3802 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3806 nft_trans_elem_set(trans) = set;
3810 void *nft_set_elem_init(const struct nft_set *set,
3811 const struct nft_set_ext_tmpl *tmpl,
3812 const u32 *key, const u32 *data,
3813 u64 timeout, gfp_t gfp)
3815 struct nft_set_ext *ext;
3818 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3822 ext = nft_set_elem_ext(set, elem);
3823 nft_set_ext_init(ext, tmpl);
3825 memcpy(nft_set_ext_key(ext), key, set->klen);
3826 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3827 memcpy(nft_set_ext_data(ext), data, set->dlen);
3828 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3829 *nft_set_ext_expiration(ext) =
3831 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3832 *nft_set_ext_timeout(ext) = timeout;
3837 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
3840 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3842 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
3843 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3844 nft_data_release(nft_set_ext_data(ext), set->dtype);
3845 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3846 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3847 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
3848 (*nft_set_ext_obj(ext))->use--;
3851 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3853 /* Only called from commit path, nft_set_elem_deactivate() already deals with
3854 * the refcounting from the preparation phase.
3856 static void nf_tables_set_elem_destroy(const struct nft_set *set, void *elem)
3858 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3860 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3861 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3865 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3866 const struct nlattr *attr, u32 nlmsg_flags)
3868 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3869 u8 genmask = nft_genmask_next(ctx->net);
3870 struct nft_data_desc d1, d2;
3871 struct nft_set_ext_tmpl tmpl;
3872 struct nft_set_ext *ext, *ext2;
3873 struct nft_set_elem elem;
3874 struct nft_set_binding *binding;
3875 struct nft_object *obj = NULL;
3876 struct nft_userdata *udata;
3877 struct nft_data data;
3878 enum nft_registers dreg;
3879 struct nft_trans *trans;
3885 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3886 nft_set_elem_policy, NULL);
3890 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3893 nft_set_ext_prepare(&tmpl);
3895 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3899 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3901 if (set->flags & NFT_SET_MAP) {
3902 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3903 !(flags & NFT_SET_ELEM_INTERVAL_END))
3905 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3906 flags & NFT_SET_ELEM_INTERVAL_END)
3909 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3914 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3915 if (!(set->flags & NFT_SET_TIMEOUT))
3917 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3918 nla[NFTA_SET_ELEM_TIMEOUT])));
3919 } else if (set->flags & NFT_SET_TIMEOUT) {
3920 timeout = set->timeout;
3923 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3924 nla[NFTA_SET_ELEM_KEY]);
3928 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3931 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3933 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3934 if (timeout != set->timeout)
3935 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3938 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
3939 if (!(set->flags & NFT_SET_OBJECT)) {
3943 obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
3944 set->objtype, genmask);
3949 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
3952 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3953 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3954 nla[NFTA_SET_ELEM_DATA]);
3959 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3962 dreg = nft_type_to_reg(set->dtype);
3963 list_for_each_entry(binding, &set->bindings, list) {
3964 struct nft_ctx bind_ctx = {
3967 .table = ctx->table,
3968 .chain = (struct nft_chain *)binding->chain,
3971 if (!(binding->flags & NFT_SET_MAP))
3974 err = nft_validate_register_store(&bind_ctx, dreg,
3981 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
3984 /* The full maximum length of userdata can exceed the maximum
3985 * offset value (U8_MAX) for following extensions, therefor it
3986 * must be the last extension added.
3989 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3990 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3992 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3997 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
3998 timeout, GFP_KERNEL);
3999 if (elem.priv == NULL)
4002 ext = nft_set_elem_ext(set, elem.priv);
4004 *nft_set_ext_flags(ext) = flags;
4006 udata = nft_set_ext_userdata(ext);
4007 udata->len = ulen - 1;
4008 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
4011 *nft_set_ext_obj(ext) = obj;
4015 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
4019 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
4020 err = set->ops->insert(ctx->net, set, &elem, &ext2);
4022 if (err == -EEXIST) {
4023 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
4024 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
4025 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
4026 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
4028 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4029 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
4030 memcmp(nft_set_ext_data(ext),
4031 nft_set_ext_data(ext2), set->dlen) != 0) ||
4032 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4033 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
4034 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
4036 else if (!(nlmsg_flags & NLM_F_EXCL))
4043 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
4048 nft_trans_elem(trans) = elem;
4049 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4053 set->ops->remove(ctx->net, set, &elem);
4059 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4060 nft_data_release(&data, d2.type);
4062 nft_data_release(&elem.key.val, d1.type);
4067 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
4068 struct sk_buff *skb, const struct nlmsghdr *nlh,
4069 const struct nlattr * const nla[],
4070 struct netlink_ext_ack *extack)
4072 u8 genmask = nft_genmask_next(net);
4073 const struct nlattr *attr;
4074 struct nft_set *set;
4078 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
4081 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
4085 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4088 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
4089 set = nf_tables_set_lookup_byid(net,
4090 nla[NFTA_SET_ELEM_LIST_SET_ID],
4094 return PTR_ERR(set);
4097 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4100 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4101 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
4109 * nft_data_hold - hold a nft_data item
4111 * @data: struct nft_data to release
4112 * @type: type of data
4114 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4115 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
4116 * NFT_GOTO verdicts. This function must be called on active data objects
4117 * from the second phase of the commit protocol.
4119 static void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
4121 if (type == NFT_DATA_VERDICT) {
4122 switch (data->verdict.code) {
4125 data->verdict.chain->use++;
4131 static void nft_set_elem_activate(const struct net *net,
4132 const struct nft_set *set,
4133 struct nft_set_elem *elem)
4135 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4137 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4138 nft_data_hold(nft_set_ext_data(ext), set->dtype);
4139 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4140 (*nft_set_ext_obj(ext))->use++;
4143 static void nft_set_elem_deactivate(const struct net *net,
4144 const struct nft_set *set,
4145 struct nft_set_elem *elem)
4147 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4149 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4150 nft_data_release(nft_set_ext_data(ext), set->dtype);
4151 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4152 (*nft_set_ext_obj(ext))->use--;
4155 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
4156 const struct nlattr *attr)
4158 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4159 struct nft_set_ext_tmpl tmpl;
4160 struct nft_data_desc desc;
4161 struct nft_set_elem elem;
4162 struct nft_set_ext *ext;
4163 struct nft_trans *trans;
4168 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4169 nft_set_elem_policy, NULL);
4174 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4177 nft_set_ext_prepare(&tmpl);
4179 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4183 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4185 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4186 nla[NFTA_SET_ELEM_KEY]);
4191 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4194 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
4197 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
4199 if (elem.priv == NULL)
4202 ext = nft_set_elem_ext(set, elem.priv);
4204 *nft_set_ext_flags(ext) = flags;
4206 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
4207 if (trans == NULL) {
4212 priv = set->ops->deactivate(ctx->net, set, &elem);
4220 nft_set_elem_deactivate(ctx->net, set, &elem);
4222 nft_trans_elem(trans) = elem;
4223 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4231 nft_data_release(&elem.key.val, desc.type);
4236 static int nft_flush_set(const struct nft_ctx *ctx,
4237 struct nft_set *set,
4238 const struct nft_set_iter *iter,
4239 struct nft_set_elem *elem)
4241 struct nft_trans *trans;
4244 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
4245 sizeof(struct nft_trans_elem), GFP_ATOMIC);
4249 if (!set->ops->flush(ctx->net, set, elem->priv)) {
4255 nft_trans_elem_set(trans) = set;
4256 nft_trans_elem(trans) = *elem;
4257 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4265 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
4266 struct sk_buff *skb, const struct nlmsghdr *nlh,
4267 const struct nlattr * const nla[],
4268 struct netlink_ext_ack *extack)
4270 u8 genmask = nft_genmask_next(net);
4271 const struct nlattr *attr;
4272 struct nft_set *set;
4276 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
4280 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4283 return PTR_ERR(set);
4284 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4287 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
4288 struct nft_set_iter iter = {
4290 .fn = nft_flush_set,
4292 set->ops->walk(&ctx, set, &iter);
4297 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4298 err = nft_del_setelem(&ctx, set, attr);
4307 void nft_set_gc_batch_release(struct rcu_head *rcu)
4309 struct nft_set_gc_batch *gcb;
4312 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4313 for (i = 0; i < gcb->head.cnt; i++)
4314 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
4317 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4319 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4322 struct nft_set_gc_batch *gcb;
4324 gcb = kzalloc(sizeof(*gcb), gfp);
4327 gcb->head.set = set;
4330 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4337 * nft_register_obj- register nf_tables stateful object type
4340 * Registers the object type for use with nf_tables. Returns zero on
4341 * success or a negative errno code otherwise.
4343 int nft_register_obj(struct nft_object_type *obj_type)
4345 if (obj_type->type == NFT_OBJECT_UNSPEC)
4348 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4349 list_add_rcu(&obj_type->list, &nf_tables_objects);
4350 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4353 EXPORT_SYMBOL_GPL(nft_register_obj);
4356 * nft_unregister_obj - unregister nf_tables object type
4359 * Unregisters the object type for use with nf_tables.
4361 void nft_unregister_obj(struct nft_object_type *obj_type)
4363 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4364 list_del_rcu(&obj_type->list);
4365 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4367 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4369 struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
4370 const struct nlattr *nla,
4371 u32 objtype, u8 genmask)
4373 struct nft_object *obj;
4375 list_for_each_entry(obj, &table->objects, list) {
4376 if (!nla_strcmp(nla, obj->name) &&
4377 objtype == obj->ops->type->type &&
4378 nft_active_genmask(obj, genmask))
4381 return ERR_PTR(-ENOENT);
4383 EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
4385 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4386 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4387 .len = NFT_TABLE_MAXNAMELEN - 1 },
4388 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4389 .len = NFT_OBJ_MAXNAMELEN - 1 },
4390 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4391 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4394 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4395 const struct nft_object_type *type,
4396 const struct nlattr *attr)
4398 struct nlattr *tb[type->maxattr + 1];
4399 const struct nft_object_ops *ops;
4400 struct nft_object *obj;
4404 err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
4409 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4412 if (type->select_ops) {
4413 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
4423 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
4427 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
4437 return ERR_PTR(err);
4440 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
4441 struct nft_object *obj, bool reset)
4443 struct nlattr *nest;
4445 nest = nla_nest_start(skb, attr);
4447 goto nla_put_failure;
4448 if (obj->ops->dump(skb, obj, reset) < 0)
4449 goto nla_put_failure;
4450 nla_nest_end(skb, nest);
4457 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4459 const struct nft_object_type *type;
4461 list_for_each_entry(type, &nf_tables_objects, list) {
4462 if (objtype == type->type)
4468 static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4470 const struct nft_object_type *type;
4472 type = __nft_obj_type_get(objtype);
4473 if (type != NULL && try_module_get(type->owner))
4476 #ifdef CONFIG_MODULES
4478 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4479 request_module("nft-obj-%u", objtype);
4480 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4481 if (__nft_obj_type_get(objtype))
4482 return ERR_PTR(-EAGAIN);
4485 return ERR_PTR(-ENOENT);
4488 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4489 struct sk_buff *skb, const struct nlmsghdr *nlh,
4490 const struct nlattr * const nla[],
4491 struct netlink_ext_ack *extack)
4493 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4494 const struct nft_object_type *type;
4495 u8 genmask = nft_genmask_next(net);
4496 int family = nfmsg->nfgen_family;
4497 struct nft_af_info *afi;
4498 struct nft_table *table;
4499 struct nft_object *obj;
4504 if (!nla[NFTA_OBJ_TYPE] ||
4505 !nla[NFTA_OBJ_NAME] ||
4506 !nla[NFTA_OBJ_DATA])
4509 afi = nf_tables_afinfo_lookup(net, family, true);
4511 return PTR_ERR(afi);
4513 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4515 return PTR_ERR(table);
4517 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4518 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4525 if (nlh->nlmsg_flags & NLM_F_EXCL)
4531 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4533 type = nft_obj_type_get(objtype);
4535 return PTR_ERR(type);
4537 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
4543 obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
4549 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4553 list_add_tail_rcu(&obj->list, &table->objects);
4559 if (obj->ops->destroy)
4560 obj->ops->destroy(obj);
4563 module_put(type->owner);
4567 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4568 u32 portid, u32 seq, int event, u32 flags,
4569 int family, const struct nft_table *table,
4570 struct nft_object *obj, bool reset)
4572 struct nfgenmsg *nfmsg;
4573 struct nlmsghdr *nlh;
4575 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4576 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4578 goto nla_put_failure;
4580 nfmsg = nlmsg_data(nlh);
4581 nfmsg->nfgen_family = family;
4582 nfmsg->version = NFNETLINK_V0;
4583 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4585 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4586 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
4587 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
4588 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
4589 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
4590 goto nla_put_failure;
4592 nlmsg_end(skb, nlh);
4596 nlmsg_trim(skb, nlh);
4600 struct nft_obj_filter {
4605 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4607 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4608 const struct nft_af_info *afi;
4609 const struct nft_table *table;
4610 unsigned int idx = 0, s_idx = cb->args[0];
4611 struct nft_obj_filter *filter = cb->data;
4612 struct net *net = sock_net(skb->sk);
4613 int family = nfmsg->nfgen_family;
4614 struct nft_object *obj;
4617 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4621 cb->seq = net->nft.base_seq;
4623 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
4624 if (family != NFPROTO_UNSPEC && family != afi->family)
4627 list_for_each_entry_rcu(table, &afi->tables, list) {
4628 list_for_each_entry_rcu(obj, &table->objects, list) {
4629 if (!nft_is_active(net, obj))
4634 memset(&cb->args[1], 0,
4635 sizeof(cb->args) - sizeof(cb->args[0]));
4636 if (filter && filter->table[0] &&
4637 strcmp(filter->table, table->name))
4640 filter->type != NFT_OBJECT_UNSPEC &&
4641 obj->ops->type->type != filter->type)
4644 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4647 NLM_F_MULTI | NLM_F_APPEND,
4648 afi->family, table, obj, reset) < 0)
4651 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4664 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4666 struct nft_obj_filter *filter = cb->data;
4668 kfree(filter->table);
4674 static struct nft_obj_filter *
4675 nft_obj_filter_alloc(const struct nlattr * const nla[])
4677 struct nft_obj_filter *filter;
4679 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
4681 return ERR_PTR(-ENOMEM);
4683 if (nla[NFTA_OBJ_TABLE]) {
4684 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_KERNEL);
4685 if (!filter->table) {
4687 return ERR_PTR(-ENOMEM);
4690 if (nla[NFTA_OBJ_TYPE])
4691 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4696 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
4697 struct sk_buff *skb, const struct nlmsghdr *nlh,
4698 const struct nlattr * const nla[],
4699 struct netlink_ext_ack *extack)
4701 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4702 u8 genmask = nft_genmask_cur(net);
4703 int family = nfmsg->nfgen_family;
4704 const struct nft_af_info *afi;
4705 const struct nft_table *table;
4706 struct nft_object *obj;
4707 struct sk_buff *skb2;
4712 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4713 struct netlink_dump_control c = {
4714 .dump = nf_tables_dump_obj,
4715 .done = nf_tables_dump_obj_done,
4718 if (nla[NFTA_OBJ_TABLE] ||
4719 nla[NFTA_OBJ_TYPE]) {
4720 struct nft_obj_filter *filter;
4722 filter = nft_obj_filter_alloc(nla);
4728 return netlink_dump_start(nlsk, skb, nlh, &c);
4731 if (!nla[NFTA_OBJ_NAME] ||
4732 !nla[NFTA_OBJ_TYPE])
4735 afi = nf_tables_afinfo_lookup(net, family, false);
4737 return PTR_ERR(afi);
4739 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4741 return PTR_ERR(table);
4743 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4744 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4746 return PTR_ERR(obj);
4748 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4752 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4755 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
4756 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
4757 family, table, obj, reset);
4761 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4767 static void nft_obj_destroy(struct nft_object *obj)
4769 if (obj->ops->destroy)
4770 obj->ops->destroy(obj);
4772 module_put(obj->ops->type->owner);
4777 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
4778 struct sk_buff *skb, const struct nlmsghdr *nlh,
4779 const struct nlattr * const nla[],
4780 struct netlink_ext_ack *extack)
4782 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4783 u8 genmask = nft_genmask_next(net);
4784 int family = nfmsg->nfgen_family;
4785 struct nft_af_info *afi;
4786 struct nft_table *table;
4787 struct nft_object *obj;
4791 if (!nla[NFTA_OBJ_TYPE] ||
4792 !nla[NFTA_OBJ_NAME])
4795 afi = nf_tables_afinfo_lookup(net, family, true);
4797 return PTR_ERR(afi);
4799 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4801 return PTR_ERR(table);
4803 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4804 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4806 return PTR_ERR(obj);
4810 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4812 return nft_delobj(&ctx, obj);
4815 void nft_obj_notify(struct net *net, struct nft_table *table,
4816 struct nft_object *obj, u32 portid, u32 seq, int event,
4817 int family, int report, gfp_t gfp)
4819 struct sk_buff *skb;
4823 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4826 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
4830 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
4837 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
4840 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4842 EXPORT_SYMBOL_GPL(nft_obj_notify);
4844 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
4845 struct nft_object *obj, int event)
4847 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
4848 ctx->afi->family, ctx->report, GFP_KERNEL);
4851 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
4852 u32 portid, u32 seq)
4854 struct nlmsghdr *nlh;
4855 struct nfgenmsg *nfmsg;
4856 char buf[TASK_COMM_LEN];
4857 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
4859 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
4861 goto nla_put_failure;
4863 nfmsg = nlmsg_data(nlh);
4864 nfmsg->nfgen_family = AF_UNSPEC;
4865 nfmsg->version = NFNETLINK_V0;
4866 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4868 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
4869 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
4870 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
4871 goto nla_put_failure;
4873 nlmsg_end(skb, nlh);
4877 nlmsg_trim(skb, nlh);
4881 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
4884 struct nlmsghdr *nlh = nlmsg_hdr(skb);
4885 struct sk_buff *skb2;
4888 if (nlmsg_report(nlh) &&
4889 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4892 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4896 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4903 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4904 nlmsg_report(nlh), GFP_KERNEL);
4907 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4911 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
4912 struct sk_buff *skb, const struct nlmsghdr *nlh,
4913 const struct nlattr * const nla[],
4914 struct netlink_ext_ack *extack)
4916 struct sk_buff *skb2;
4919 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4923 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4928 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4934 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
4935 [NFT_MSG_NEWTABLE] = {
4936 .call_batch = nf_tables_newtable,
4937 .attr_count = NFTA_TABLE_MAX,
4938 .policy = nft_table_policy,
4940 [NFT_MSG_GETTABLE] = {
4941 .call = nf_tables_gettable,
4942 .attr_count = NFTA_TABLE_MAX,
4943 .policy = nft_table_policy,
4945 [NFT_MSG_DELTABLE] = {
4946 .call_batch = nf_tables_deltable,
4947 .attr_count = NFTA_TABLE_MAX,
4948 .policy = nft_table_policy,
4950 [NFT_MSG_NEWCHAIN] = {
4951 .call_batch = nf_tables_newchain,
4952 .attr_count = NFTA_CHAIN_MAX,
4953 .policy = nft_chain_policy,
4955 [NFT_MSG_GETCHAIN] = {
4956 .call = nf_tables_getchain,
4957 .attr_count = NFTA_CHAIN_MAX,
4958 .policy = nft_chain_policy,
4960 [NFT_MSG_DELCHAIN] = {
4961 .call_batch = nf_tables_delchain,
4962 .attr_count = NFTA_CHAIN_MAX,
4963 .policy = nft_chain_policy,
4965 [NFT_MSG_NEWRULE] = {
4966 .call_batch = nf_tables_newrule,
4967 .attr_count = NFTA_RULE_MAX,
4968 .policy = nft_rule_policy,
4970 [NFT_MSG_GETRULE] = {
4971 .call = nf_tables_getrule,
4972 .attr_count = NFTA_RULE_MAX,
4973 .policy = nft_rule_policy,
4975 [NFT_MSG_DELRULE] = {
4976 .call_batch = nf_tables_delrule,
4977 .attr_count = NFTA_RULE_MAX,
4978 .policy = nft_rule_policy,
4980 [NFT_MSG_NEWSET] = {
4981 .call_batch = nf_tables_newset,
4982 .attr_count = NFTA_SET_MAX,
4983 .policy = nft_set_policy,
4985 [NFT_MSG_GETSET] = {
4986 .call = nf_tables_getset,
4987 .attr_count = NFTA_SET_MAX,
4988 .policy = nft_set_policy,
4990 [NFT_MSG_DELSET] = {
4991 .call_batch = nf_tables_delset,
4992 .attr_count = NFTA_SET_MAX,
4993 .policy = nft_set_policy,
4995 [NFT_MSG_NEWSETELEM] = {
4996 .call_batch = nf_tables_newsetelem,
4997 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4998 .policy = nft_set_elem_list_policy,
5000 [NFT_MSG_GETSETELEM] = {
5001 .call = nf_tables_getsetelem,
5002 .attr_count = NFTA_SET_ELEM_LIST_MAX,
5003 .policy = nft_set_elem_list_policy,
5005 [NFT_MSG_DELSETELEM] = {
5006 .call_batch = nf_tables_delsetelem,
5007 .attr_count = NFTA_SET_ELEM_LIST_MAX,
5008 .policy = nft_set_elem_list_policy,
5010 [NFT_MSG_GETGEN] = {
5011 .call = nf_tables_getgen,
5013 [NFT_MSG_NEWOBJ] = {
5014 .call_batch = nf_tables_newobj,
5015 .attr_count = NFTA_OBJ_MAX,
5016 .policy = nft_obj_policy,
5018 [NFT_MSG_GETOBJ] = {
5019 .call = nf_tables_getobj,
5020 .attr_count = NFTA_OBJ_MAX,
5021 .policy = nft_obj_policy,
5023 [NFT_MSG_DELOBJ] = {
5024 .call_batch = nf_tables_delobj,
5025 .attr_count = NFTA_OBJ_MAX,
5026 .policy = nft_obj_policy,
5028 [NFT_MSG_GETOBJ_RESET] = {
5029 .call = nf_tables_getobj,
5030 .attr_count = NFTA_OBJ_MAX,
5031 .policy = nft_obj_policy,
5035 static void nft_chain_commit_update(struct nft_trans *trans)
5037 struct nft_base_chain *basechain;
5039 if (nft_trans_chain_name(trans))
5040 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
5042 if (!nft_is_base_chain(trans->ctx.chain))
5045 basechain = nft_base_chain(trans->ctx.chain);
5046 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
5048 switch (nft_trans_chain_policy(trans)) {
5051 basechain->policy = nft_trans_chain_policy(trans);
5056 static void nf_tables_commit_release(struct nft_trans *trans)
5058 switch (trans->msg_type) {
5059 case NFT_MSG_DELTABLE:
5060 nf_tables_table_destroy(&trans->ctx);
5062 case NFT_MSG_DELCHAIN:
5063 nf_tables_chain_destroy(trans->ctx.chain);
5065 case NFT_MSG_DELRULE:
5066 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
5068 case NFT_MSG_DELSET:
5069 nft_set_destroy(nft_trans_set(trans));
5071 case NFT_MSG_DELSETELEM:
5072 nf_tables_set_elem_destroy(nft_trans_elem_set(trans),
5073 nft_trans_elem(trans).priv);
5075 case NFT_MSG_DELOBJ:
5076 nft_obj_destroy(nft_trans_obj(trans));
5082 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
5084 struct nft_trans *trans, *next;
5085 struct nft_trans_elem *te;
5087 /* Bump generation counter, invalidate any dump in progress */
5088 while (++net->nft.base_seq == 0);
5090 /* A new generation has just started */
5091 net->nft.gencursor = nft_gencursor_next(net);
5093 /* Make sure all packets have left the previous generation before
5094 * purging old rules.
5098 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
5099 switch (trans->msg_type) {
5100 case NFT_MSG_NEWTABLE:
5101 if (nft_trans_table_update(trans)) {
5102 if (!nft_trans_table_enable(trans)) {
5103 nf_tables_table_disable(net,
5106 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
5109 nft_clear(net, trans->ctx.table);
5111 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
5112 nft_trans_destroy(trans);
5114 case NFT_MSG_DELTABLE:
5115 list_del_rcu(&trans->ctx.table->list);
5116 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
5118 case NFT_MSG_NEWCHAIN:
5119 if (nft_trans_chain_update(trans))
5120 nft_chain_commit_update(trans);
5122 nft_clear(net, trans->ctx.chain);
5124 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
5125 nft_trans_destroy(trans);
5127 case NFT_MSG_DELCHAIN:
5128 list_del_rcu(&trans->ctx.chain->list);
5129 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
5130 nf_tables_unregister_hooks(trans->ctx.net,
5133 trans->ctx.afi->nops);
5135 case NFT_MSG_NEWRULE:
5136 nft_clear(trans->ctx.net, nft_trans_rule(trans));
5137 nf_tables_rule_notify(&trans->ctx,
5138 nft_trans_rule(trans),
5140 nft_trans_destroy(trans);
5142 case NFT_MSG_DELRULE:
5143 list_del_rcu(&nft_trans_rule(trans)->list);
5144 nf_tables_rule_notify(&trans->ctx,
5145 nft_trans_rule(trans),
5148 case NFT_MSG_NEWSET:
5149 nft_clear(net, nft_trans_set(trans));
5150 /* This avoids hitting -EBUSY when deleting the table
5151 * from the transaction.
5153 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
5154 !list_empty(&nft_trans_set(trans)->bindings))
5155 trans->ctx.table->use--;
5157 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
5158 NFT_MSG_NEWSET, GFP_KERNEL);
5159 nft_trans_destroy(trans);
5161 case NFT_MSG_DELSET:
5162 list_del_rcu(&nft_trans_set(trans)->list);
5163 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
5164 NFT_MSG_DELSET, GFP_KERNEL);
5166 case NFT_MSG_NEWSETELEM:
5167 te = (struct nft_trans_elem *)trans->data;
5169 te->set->ops->activate(net, te->set, &te->elem);
5170 nf_tables_setelem_notify(&trans->ctx, te->set,
5172 NFT_MSG_NEWSETELEM, 0);
5173 nft_trans_destroy(trans);
5175 case NFT_MSG_DELSETELEM:
5176 te = (struct nft_trans_elem *)trans->data;
5178 nf_tables_setelem_notify(&trans->ctx, te->set,
5180 NFT_MSG_DELSETELEM, 0);
5181 te->set->ops->remove(net, te->set, &te->elem);
5182 atomic_dec(&te->set->nelems);
5185 case NFT_MSG_NEWOBJ:
5186 nft_clear(net, nft_trans_obj(trans));
5187 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
5189 nft_trans_destroy(trans);
5191 case NFT_MSG_DELOBJ:
5192 list_del_rcu(&nft_trans_obj(trans)->list);
5193 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
5201 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
5202 list_del(&trans->list);
5203 nf_tables_commit_release(trans);
5206 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
5211 static void nf_tables_abort_release(struct nft_trans *trans)
5213 switch (trans->msg_type) {
5214 case NFT_MSG_NEWTABLE:
5215 nf_tables_table_destroy(&trans->ctx);
5217 case NFT_MSG_NEWCHAIN:
5218 nf_tables_chain_destroy(trans->ctx.chain);
5220 case NFT_MSG_NEWRULE:
5221 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
5223 case NFT_MSG_NEWSET:
5224 nft_set_destroy(nft_trans_set(trans));
5226 case NFT_MSG_NEWSETELEM:
5227 nft_set_elem_destroy(nft_trans_elem_set(trans),
5228 nft_trans_elem(trans).priv, true);
5230 case NFT_MSG_NEWOBJ:
5231 nft_obj_destroy(nft_trans_obj(trans));
5237 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
5239 struct nft_trans *trans, *next;
5240 struct nft_trans_elem *te;
5242 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
5244 switch (trans->msg_type) {
5245 case NFT_MSG_NEWTABLE:
5246 if (nft_trans_table_update(trans)) {
5247 if (nft_trans_table_enable(trans)) {
5248 nf_tables_table_disable(net,
5251 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
5253 nft_trans_destroy(trans);
5255 list_del_rcu(&trans->ctx.table->list);
5258 case NFT_MSG_DELTABLE:
5259 nft_clear(trans->ctx.net, trans->ctx.table);
5260 nft_trans_destroy(trans);
5262 case NFT_MSG_NEWCHAIN:
5263 if (nft_trans_chain_update(trans)) {
5264 free_percpu(nft_trans_chain_stats(trans));
5266 nft_trans_destroy(trans);
5268 trans->ctx.table->use--;
5269 list_del_rcu(&trans->ctx.chain->list);
5270 nf_tables_unregister_hooks(trans->ctx.net,
5273 trans->ctx.afi->nops);
5276 case NFT_MSG_DELCHAIN:
5277 trans->ctx.table->use++;
5278 nft_clear(trans->ctx.net, trans->ctx.chain);
5279 nft_trans_destroy(trans);
5281 case NFT_MSG_NEWRULE:
5282 trans->ctx.chain->use--;
5283 list_del_rcu(&nft_trans_rule(trans)->list);
5285 case NFT_MSG_DELRULE:
5286 trans->ctx.chain->use++;
5287 nft_clear(trans->ctx.net, nft_trans_rule(trans));
5288 nft_trans_destroy(trans);
5290 case NFT_MSG_NEWSET:
5291 trans->ctx.table->use--;
5292 list_del_rcu(&nft_trans_set(trans)->list);
5294 case NFT_MSG_DELSET:
5295 trans->ctx.table->use++;
5296 nft_clear(trans->ctx.net, nft_trans_set(trans));
5297 nft_trans_destroy(trans);
5299 case NFT_MSG_NEWSETELEM:
5300 te = (struct nft_trans_elem *)trans->data;
5302 te->set->ops->remove(net, te->set, &te->elem);
5303 atomic_dec(&te->set->nelems);
5305 case NFT_MSG_DELSETELEM:
5306 te = (struct nft_trans_elem *)trans->data;
5308 nft_set_elem_activate(net, te->set, &te->elem);
5309 te->set->ops->activate(net, te->set, &te->elem);
5312 nft_trans_destroy(trans);
5314 case NFT_MSG_NEWOBJ:
5315 trans->ctx.table->use--;
5316 list_del_rcu(&nft_trans_obj(trans)->list);
5318 case NFT_MSG_DELOBJ:
5319 trans->ctx.table->use++;
5320 nft_clear(trans->ctx.net, nft_trans_obj(trans));
5321 nft_trans_destroy(trans);
5328 list_for_each_entry_safe_reverse(trans, next,
5329 &net->nft.commit_list, list) {
5330 list_del(&trans->list);
5331 nf_tables_abort_release(trans);
5337 static bool nf_tables_valid_genid(struct net *net, u32 genid)
5339 return net->nft.base_seq == genid;
5342 static const struct nfnetlink_subsystem nf_tables_subsys = {
5343 .name = "nf_tables",
5344 .subsys_id = NFNL_SUBSYS_NFTABLES,
5345 .cb_count = NFT_MSG_MAX,
5347 .commit = nf_tables_commit,
5348 .abort = nf_tables_abort,
5349 .valid_genid = nf_tables_valid_genid,
5352 int nft_chain_validate_dependency(const struct nft_chain *chain,
5353 enum nft_chain_type type)
5355 const struct nft_base_chain *basechain;
5357 if (nft_is_base_chain(chain)) {
5358 basechain = nft_base_chain(chain);
5359 if (basechain->type->type != type)
5364 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
5366 int nft_chain_validate_hooks(const struct nft_chain *chain,
5367 unsigned int hook_flags)
5369 struct nft_base_chain *basechain;
5371 if (nft_is_base_chain(chain)) {
5372 basechain = nft_base_chain(chain);
5374 if ((1 << basechain->ops[0].hooknum) & hook_flags)
5382 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
5385 * Loop detection - walk through the ruleset beginning at the destination chain
5386 * of a new jump until either the source chain is reached (loop) or all
5387 * reachable chains have been traversed.
5389 * The loop check is performed whenever a new jump verdict is added to an
5390 * expression or verdict map or a verdict map is bound to a new chain.
5393 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5394 const struct nft_chain *chain);
5396 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
5397 struct nft_set *set,
5398 const struct nft_set_iter *iter,
5399 struct nft_set_elem *elem)
5401 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5402 const struct nft_data *data;
5404 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5405 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
5408 data = nft_set_ext_data(ext);
5409 switch (data->verdict.code) {
5412 return nf_tables_check_loops(ctx, data->verdict.chain);
5418 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5419 const struct nft_chain *chain)
5421 const struct nft_rule *rule;
5422 const struct nft_expr *expr, *last;
5423 struct nft_set *set;
5424 struct nft_set_binding *binding;
5425 struct nft_set_iter iter;
5427 if (ctx->chain == chain)
5430 list_for_each_entry(rule, &chain->rules, list) {
5431 nft_rule_for_each_expr(expr, last, rule) {
5432 const struct nft_data *data = NULL;
5435 if (!expr->ops->validate)
5438 err = expr->ops->validate(ctx, expr, &data);
5445 switch (data->verdict.code) {
5448 err = nf_tables_check_loops(ctx,
5449 data->verdict.chain);
5458 list_for_each_entry(set, &ctx->table->sets, list) {
5459 if (!nft_is_active_next(ctx->net, set))
5461 if (!(set->flags & NFT_SET_MAP) ||
5462 set->dtype != NFT_DATA_VERDICT)
5465 list_for_each_entry(binding, &set->bindings, list) {
5466 if (!(binding->flags & NFT_SET_MAP) ||
5467 binding->chain != chain)
5470 iter.genmask = nft_genmask_next(ctx->net);
5474 iter.fn = nf_tables_loop_check_setelem;
5476 set->ops->walk(ctx, set, &iter);
5486 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
5488 * @attr: netlink attribute to fetch value from
5489 * @max: maximum value to be stored in dest
5490 * @dest: pointer to the variable
5492 * Parse, check and store a given u32 netlink attribute into variable.
5493 * This function returns -ERANGE if the value goes over maximum value.
5494 * Otherwise a 0 is returned and the attribute value is stored in the
5495 * destination variable.
5497 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
5501 val = ntohl(nla_get_be32(attr));
5508 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
5511 * nft_parse_register - parse a register value from a netlink attribute
5513 * @attr: netlink attribute
5515 * Parse and translate a register value from a netlink attribute.
5516 * Registers used to be 128 bit wide, these register numbers will be
5517 * mapped to the corresponding 32 bit register numbers.
5519 unsigned int nft_parse_register(const struct nlattr *attr)
5523 reg = ntohl(nla_get_be32(attr));
5525 case NFT_REG_VERDICT...NFT_REG_4:
5526 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
5528 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
5531 EXPORT_SYMBOL_GPL(nft_parse_register);
5534 * nft_dump_register - dump a register value to a netlink attribute
5536 * @skb: socket buffer
5537 * @attr: attribute number
5538 * @reg: register number
5540 * Construct a netlink attribute containing the register number. For
5541 * compatibility reasons, register numbers being a multiple of 4 are
5542 * translated to the corresponding 128 bit register numbers.
5544 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
5546 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
5547 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
5549 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
5551 return nla_put_be32(skb, attr, htonl(reg));
5553 EXPORT_SYMBOL_GPL(nft_dump_register);
5556 * nft_validate_register_load - validate a load from a register
5558 * @reg: the register number
5559 * @len: the length of the data
5561 * Validate that the input register is one of the general purpose
5562 * registers and that the length of the load is within the bounds.
5564 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
5566 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5570 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
5575 EXPORT_SYMBOL_GPL(nft_validate_register_load);
5578 * nft_validate_register_store - validate an expressions' register store
5580 * @ctx: context of the expression performing the load
5581 * @reg: the destination register number
5582 * @data: the data to load
5583 * @type: the data type
5584 * @len: the length of the data
5586 * Validate that a data load uses the appropriate data type for
5587 * the destination register and the length is within the bounds.
5588 * A value of NULL for the data means that its runtime gathered
5591 int nft_validate_register_store(const struct nft_ctx *ctx,
5592 enum nft_registers reg,
5593 const struct nft_data *data,
5594 enum nft_data_types type, unsigned int len)
5599 case NFT_REG_VERDICT:
5600 if (type != NFT_DATA_VERDICT)
5604 (data->verdict.code == NFT_GOTO ||
5605 data->verdict.code == NFT_JUMP)) {
5606 err = nf_tables_check_loops(ctx, data->verdict.chain);
5610 if (ctx->chain->level + 1 >
5611 data->verdict.chain->level) {
5612 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
5614 data->verdict.chain->level = ctx->chain->level + 1;
5620 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5624 if (reg * NFT_REG32_SIZE + len >
5625 FIELD_SIZEOF(struct nft_regs, data))
5628 if (data != NULL && type != NFT_DATA_VALUE)
5633 EXPORT_SYMBOL_GPL(nft_validate_register_store);
5635 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
5636 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
5637 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
5638 .len = NFT_CHAIN_MAXNAMELEN - 1 },
5641 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
5642 struct nft_data_desc *desc, const struct nlattr *nla)
5644 u8 genmask = nft_genmask_next(ctx->net);
5645 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
5646 struct nft_chain *chain;
5649 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
5654 if (!tb[NFTA_VERDICT_CODE])
5656 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
5658 switch (data->verdict.code) {
5660 switch (data->verdict.code & NF_VERDICT_MASK) {
5675 if (!tb[NFTA_VERDICT_CHAIN])
5677 chain = nf_tables_chain_lookup(ctx->table,
5678 tb[NFTA_VERDICT_CHAIN], genmask);
5680 return PTR_ERR(chain);
5681 if (nft_is_base_chain(chain))
5685 data->verdict.chain = chain;
5689 desc->len = sizeof(data->verdict);
5690 desc->type = NFT_DATA_VERDICT;
5694 static void nft_verdict_uninit(const struct nft_data *data)
5696 switch (data->verdict.code) {
5699 data->verdict.chain->use--;
5704 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
5706 struct nlattr *nest;
5708 nest = nla_nest_start(skb, type);
5710 goto nla_put_failure;
5712 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
5713 goto nla_put_failure;
5718 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
5720 goto nla_put_failure;
5722 nla_nest_end(skb, nest);
5729 static int nft_value_init(const struct nft_ctx *ctx,
5730 struct nft_data *data, unsigned int size,
5731 struct nft_data_desc *desc, const struct nlattr *nla)
5741 nla_memcpy(data->data, nla, len);
5742 desc->type = NFT_DATA_VALUE;
5747 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
5750 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
5753 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
5754 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
5755 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
5759 * nft_data_init - parse nf_tables data netlink attributes
5761 * @ctx: context of the expression using the data
5762 * @data: destination struct nft_data
5763 * @size: maximum data length
5764 * @desc: data description
5765 * @nla: netlink attribute containing data
5767 * Parse the netlink data attributes and initialize a struct nft_data.
5768 * The type and length of data are returned in the data description.
5770 * The caller can indicate that it only wants to accept data of type
5771 * NFT_DATA_VALUE by passing NULL for the ctx argument.
5773 int nft_data_init(const struct nft_ctx *ctx,
5774 struct nft_data *data, unsigned int size,
5775 struct nft_data_desc *desc, const struct nlattr *nla)
5777 struct nlattr *tb[NFTA_DATA_MAX + 1];
5780 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
5784 if (tb[NFTA_DATA_VALUE])
5785 return nft_value_init(ctx, data, size, desc,
5786 tb[NFTA_DATA_VALUE]);
5787 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
5788 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
5791 EXPORT_SYMBOL_GPL(nft_data_init);
5794 * nft_data_release - release a nft_data item
5796 * @data: struct nft_data to release
5797 * @type: type of data
5799 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5800 * all others need to be released by calling this function.
5802 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
5804 if (type < NFT_DATA_VERDICT)
5807 case NFT_DATA_VERDICT:
5808 return nft_verdict_uninit(data);
5813 EXPORT_SYMBOL_GPL(nft_data_release);
5815 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
5816 enum nft_data_types type, unsigned int len)
5818 struct nlattr *nest;
5821 nest = nla_nest_start(skb, attr);
5826 case NFT_DATA_VALUE:
5827 err = nft_value_dump(skb, data, len);
5829 case NFT_DATA_VERDICT:
5830 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
5837 nla_nest_end(skb, nest);
5840 EXPORT_SYMBOL_GPL(nft_data_dump);
5842 static int __net_init nf_tables_init_net(struct net *net)
5844 INIT_LIST_HEAD(&net->nft.af_info);
5845 INIT_LIST_HEAD(&net->nft.commit_list);
5846 net->nft.base_seq = 1;
5850 static void __net_exit nf_tables_exit_net(struct net *net)
5852 WARN_ON_ONCE(!list_empty(&net->nft.af_info));
5853 WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
5856 int __nft_release_basechain(struct nft_ctx *ctx)
5858 struct nft_rule *rule, *nr;
5860 BUG_ON(!nft_is_base_chain(ctx->chain));
5862 nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
5864 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
5865 list_del(&rule->list);
5867 nf_tables_rule_destroy(ctx, rule);
5869 list_del(&ctx->chain->list);
5871 nf_tables_chain_destroy(ctx->chain);
5875 EXPORT_SYMBOL_GPL(__nft_release_basechain);
5877 /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
5878 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
5880 struct nft_table *table, *nt;
5881 struct nft_chain *chain, *nc;
5882 struct nft_object *obj, *ne;
5883 struct nft_rule *rule, *nr;
5884 struct nft_set *set, *ns;
5885 struct nft_ctx ctx = {
5890 list_for_each_entry_safe(table, nt, &afi->tables, list) {
5891 list_for_each_entry(chain, &table->chains, list)
5892 nf_tables_unregister_hooks(net, table, chain,
5894 /* No packets are walking on these chains anymore. */
5896 list_for_each_entry(chain, &table->chains, list) {
5898 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
5899 list_del(&rule->list);
5901 nf_tables_rule_destroy(&ctx, rule);
5904 list_for_each_entry_safe(set, ns, &table->sets, list) {
5905 list_del(&set->list);
5907 nft_set_destroy(set);
5909 list_for_each_entry_safe(obj, ne, &table->objects, list) {
5910 list_del(&obj->list);
5912 nft_obj_destroy(obj);
5914 list_for_each_entry_safe(chain, nc, &table->chains, list) {
5915 list_del(&chain->list);
5917 nf_tables_chain_destroy(chain);
5919 list_del(&table->list);
5920 nf_tables_table_destroy(&ctx);
5924 static struct pernet_operations nf_tables_net_ops = {
5925 .init = nf_tables_init_net,
5926 .exit = nf_tables_exit_net,
5929 static int __init nf_tables_module_init(void)
5933 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
5940 err = nf_tables_core_module_init();
5944 err = nfnetlink_subsys_register(&nf_tables_subsys);
5948 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
5949 return register_pernet_subsys(&nf_tables_net_ops);
5951 nf_tables_core_module_exit();
5958 static void __exit nf_tables_module_exit(void)
5960 unregister_pernet_subsys(&nf_tables_net_ops);
5961 nfnetlink_subsys_unregister(&nf_tables_subsys);
5963 nf_tables_core_module_exit();
5967 module_init(nf_tables_module_init);
5968 module_exit(nf_tables_module_exit);
5970 MODULE_LICENSE("GPL");
5971 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
5972 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);