2 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/list.h>
14 #include <linux/skbuff.h>
15 #include <linux/netlink.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_tables_core.h>
20 #include <net/netfilter/nf_tables.h>
21 #include <net/net_namespace.h>
24 static LIST_HEAD(nf_tables_expressions);
25 static LIST_HEAD(nf_tables_objects);
28 * nft_register_afinfo - register nf_tables address family info
30 * @afi: address family info to register
32 * Register the address family for use with nf_tables. Returns zero on
33 * success or a negative errno code otherwise.
35 int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
37 INIT_LIST_HEAD(&afi->tables);
38 nfnl_lock(NFNL_SUBSYS_NFTABLES);
39 list_add_tail_rcu(&afi->list, &net->nft.af_info);
40 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
43 EXPORT_SYMBOL_GPL(nft_register_afinfo);
45 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi);
48 * nft_unregister_afinfo - unregister nf_tables address family info
50 * @afi: address family info to unregister
52 * Unregister the address family for use with nf_tables.
54 void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi)
56 nfnl_lock(NFNL_SUBSYS_NFTABLES);
57 __nft_release_afinfo(net, afi);
58 list_del_rcu(&afi->list);
59 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
61 EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
63 static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
65 struct nft_af_info *afi;
67 list_for_each_entry(afi, &net->nft.af_info, list) {
68 if (afi->family == family)
74 static struct nft_af_info *
75 nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
77 struct nft_af_info *afi;
79 afi = nft_afinfo_lookup(net, family);
84 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
85 request_module("nft-afinfo-%u", family);
86 nfnl_lock(NFNL_SUBSYS_NFTABLES);
87 afi = nft_afinfo_lookup(net, family);
89 return ERR_PTR(-EAGAIN);
92 return ERR_PTR(-EAFNOSUPPORT);
95 static void nft_ctx_init(struct nft_ctx *ctx,
97 const struct sk_buff *skb,
98 const struct nlmsghdr *nlh,
99 struct nft_af_info *afi,
100 struct nft_table *table,
101 struct nft_chain *chain,
102 const struct nlattr * const *nla)
109 ctx->portid = NETLINK_CB(skb).portid;
110 ctx->report = nlmsg_report(nlh);
111 ctx->seq = nlh->nlmsg_seq;
114 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
115 int msg_type, u32 size, gfp_t gfp)
117 struct nft_trans *trans;
119 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
123 trans->msg_type = msg_type;
129 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
130 int msg_type, u32 size)
132 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
135 static void nft_trans_destroy(struct nft_trans *trans)
137 list_del(&trans->list);
141 static int nf_tables_register_hooks(struct net *net,
142 const struct nft_table *table,
143 struct nft_chain *chain,
144 unsigned int hook_nops)
146 if (table->flags & NFT_TABLE_F_DORMANT ||
147 !(chain->flags & NFT_BASE_CHAIN))
150 return nf_register_net_hooks(net, nft_base_chain(chain)->ops,
154 static void nf_tables_unregister_hooks(struct net *net,
155 const struct nft_table *table,
156 struct nft_chain *chain,
157 unsigned int hook_nops)
159 if (table->flags & NFT_TABLE_F_DORMANT ||
160 !(chain->flags & NFT_BASE_CHAIN))
163 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops, hook_nops);
166 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
168 struct nft_trans *trans;
170 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
174 if (msg_type == NFT_MSG_NEWTABLE)
175 nft_activate_next(ctx->net, ctx->table);
177 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
181 static int nft_deltable(struct nft_ctx *ctx)
185 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
189 nft_deactivate_next(ctx->net, ctx->table);
193 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
195 struct nft_trans *trans;
197 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
201 if (msg_type == NFT_MSG_NEWCHAIN)
202 nft_activate_next(ctx->net, ctx->chain);
204 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
208 static int nft_delchain(struct nft_ctx *ctx)
212 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
217 nft_deactivate_next(ctx->net, ctx->chain);
223 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
225 /* You cannot delete the same rule twice */
226 if (nft_is_active_next(ctx->net, rule)) {
227 nft_deactivate_next(ctx->net, rule);
234 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
235 struct nft_rule *rule)
237 struct nft_trans *trans;
239 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
243 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
244 nft_trans_rule_id(trans) =
245 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
247 nft_trans_rule(trans) = rule;
248 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
253 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
255 struct nft_trans *trans;
258 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
262 err = nf_tables_delrule_deactivate(ctx, rule);
264 nft_trans_destroy(trans);
271 static int nft_delrule_by_chain(struct nft_ctx *ctx)
273 struct nft_rule *rule;
276 list_for_each_entry(rule, &ctx->chain->rules, list) {
277 err = nft_delrule(ctx, rule);
284 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
287 struct nft_trans *trans;
289 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
293 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
294 nft_trans_set_id(trans) =
295 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
296 nft_activate_next(ctx->net, set);
298 nft_trans_set(trans) = set;
299 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
304 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
308 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
312 nft_deactivate_next(ctx->net, set);
318 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
319 struct nft_object *obj)
321 struct nft_trans *trans;
323 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
327 if (msg_type == NFT_MSG_NEWOBJ)
328 nft_activate_next(ctx->net, obj);
330 nft_trans_obj(trans) = obj;
331 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
336 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
340 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
344 nft_deactivate_next(ctx->net, obj);
354 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
355 const struct nlattr *nla,
358 struct nft_table *table;
360 list_for_each_entry(table, &afi->tables, list) {
361 if (!nla_strcmp(nla, table->name) &&
362 nft_active_genmask(table, genmask))
368 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
369 const struct nlattr *nla,
372 struct nft_table *table;
375 return ERR_PTR(-EINVAL);
377 table = nft_table_lookup(afi, nla, genmask);
381 return ERR_PTR(-ENOENT);
384 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
386 return ++table->hgenerator;
389 static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
391 static const struct nf_chain_type *
392 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
396 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
397 if (chain_type[family][i] != NULL &&
398 !nla_strcmp(nla, chain_type[family][i]->name))
399 return chain_type[family][i];
404 static const struct nf_chain_type *
405 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
406 const struct nlattr *nla,
409 const struct nf_chain_type *type;
411 type = __nf_tables_chain_type_lookup(afi->family, nla);
414 #ifdef CONFIG_MODULES
416 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
417 request_module("nft-chain-%u-%.*s", afi->family,
418 nla_len(nla), (const char *)nla_data(nla));
419 nfnl_lock(NFNL_SUBSYS_NFTABLES);
420 type = __nf_tables_chain_type_lookup(afi->family, nla);
422 return ERR_PTR(-EAGAIN);
425 return ERR_PTR(-ENOENT);
428 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
429 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
430 .len = NFT_TABLE_MAXNAMELEN - 1 },
431 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
434 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
435 u32 portid, u32 seq, int event, u32 flags,
436 int family, const struct nft_table *table)
438 struct nlmsghdr *nlh;
439 struct nfgenmsg *nfmsg;
441 event |= NFNL_SUBSYS_NFTABLES << 8;
442 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
444 goto nla_put_failure;
446 nfmsg = nlmsg_data(nlh);
447 nfmsg->nfgen_family = family;
448 nfmsg->version = NFNETLINK_V0;
449 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
451 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
452 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
453 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
454 goto nla_put_failure;
460 nlmsg_trim(skb, nlh);
464 static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
470 !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 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
486 ctx->report, GFP_KERNEL);
489 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
495 static int nf_tables_dump_tables(struct sk_buff *skb,
496 struct netlink_callback *cb)
498 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
499 const struct nft_af_info *afi;
500 const struct nft_table *table;
501 unsigned int idx = 0, s_idx = cb->args[0];
502 struct net *net = sock_net(skb->sk);
503 int family = nfmsg->nfgen_family;
506 cb->seq = net->nft.base_seq;
508 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
509 if (family != NFPROTO_UNSPEC && family != afi->family)
512 list_for_each_entry_rcu(table, &afi->tables, list) {
516 memset(&cb->args[1], 0,
517 sizeof(cb->args) - sizeof(cb->args[0]));
518 if (!nft_is_active(net, table))
520 if (nf_tables_fill_table_info(skb, net,
521 NETLINK_CB(cb->skb).portid,
525 afi->family, table) < 0)
528 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
539 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
540 struct sk_buff *skb, const struct nlmsghdr *nlh,
541 const struct nlattr * const nla[])
543 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
544 u8 genmask = nft_genmask_cur(net);
545 const struct nft_af_info *afi;
546 const struct nft_table *table;
547 struct sk_buff *skb2;
548 int family = nfmsg->nfgen_family;
551 if (nlh->nlmsg_flags & NLM_F_DUMP) {
552 struct netlink_dump_control c = {
553 .dump = nf_tables_dump_tables,
555 return netlink_dump_start(nlsk, skb, nlh, &c);
558 afi = nf_tables_afinfo_lookup(net, family, false);
562 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
564 return PTR_ERR(table);
566 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
570 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
571 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
576 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
583 static void _nf_tables_table_disable(struct net *net,
584 const struct nft_af_info *afi,
585 struct nft_table *table,
588 struct nft_chain *chain;
591 list_for_each_entry(chain, &table->chains, list) {
592 if (!nft_is_active_next(net, chain))
594 if (!(chain->flags & NFT_BASE_CHAIN))
597 if (cnt && i++ == cnt)
600 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
605 static int nf_tables_table_enable(struct net *net,
606 const struct nft_af_info *afi,
607 struct nft_table *table)
609 struct nft_chain *chain;
612 list_for_each_entry(chain, &table->chains, list) {
613 if (!nft_is_active_next(net, chain))
615 if (!(chain->flags & NFT_BASE_CHAIN))
618 err = nf_register_net_hooks(net, nft_base_chain(chain)->ops,
628 _nf_tables_table_disable(net, afi, table, i);
632 static void nf_tables_table_disable(struct net *net,
633 const struct nft_af_info *afi,
634 struct nft_table *table)
636 _nf_tables_table_disable(net, afi, table, 0);
639 static int nf_tables_updtable(struct nft_ctx *ctx)
641 struct nft_trans *trans;
645 if (!ctx->nla[NFTA_TABLE_FLAGS])
648 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
649 if (flags & ~NFT_TABLE_F_DORMANT)
652 if (flags == ctx->table->flags)
655 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
656 sizeof(struct nft_trans_table));
660 if ((flags & NFT_TABLE_F_DORMANT) &&
661 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
662 nft_trans_table_enable(trans) = false;
663 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
664 ctx->table->flags & NFT_TABLE_F_DORMANT) {
665 ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table);
667 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
668 nft_trans_table_enable(trans) = true;
674 nft_trans_table_update(trans) = true;
675 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
678 nft_trans_destroy(trans);
682 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
683 struct sk_buff *skb, const struct nlmsghdr *nlh,
684 const struct nlattr * const nla[])
686 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
687 u8 genmask = nft_genmask_next(net);
688 const struct nlattr *name;
689 struct nft_af_info *afi;
690 struct nft_table *table;
691 int family = nfmsg->nfgen_family;
696 afi = nf_tables_afinfo_lookup(net, family, true);
700 name = nla[NFTA_TABLE_NAME];
701 table = nf_tables_table_lookup(afi, name, genmask);
703 if (PTR_ERR(table) != -ENOENT)
704 return PTR_ERR(table);
706 if (nlh->nlmsg_flags & NLM_F_EXCL)
708 if (nlh->nlmsg_flags & NLM_F_REPLACE)
711 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
712 return nf_tables_updtable(&ctx);
715 if (nla[NFTA_TABLE_FLAGS]) {
716 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
717 if (flags & ~NFT_TABLE_F_DORMANT)
722 if (!try_module_get(afi->owner))
726 table = kzalloc(sizeof(*table), GFP_KERNEL);
730 nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
731 INIT_LIST_HEAD(&table->chains);
732 INIT_LIST_HEAD(&table->sets);
733 INIT_LIST_HEAD(&table->objects);
734 table->flags = flags;
736 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
737 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
741 list_add_tail_rcu(&table->list, &afi->tables);
746 module_put(afi->owner);
751 static int nft_flush_table(struct nft_ctx *ctx)
754 struct nft_chain *chain, *nc;
755 struct nft_object *obj, *ne;
756 struct nft_set *set, *ns;
758 list_for_each_entry(chain, &ctx->table->chains, list) {
759 if (!nft_is_active_next(ctx->net, chain))
764 err = nft_delrule_by_chain(ctx);
769 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
770 if (!nft_is_active_next(ctx->net, set))
773 if (set->flags & NFT_SET_ANONYMOUS &&
774 !list_empty(&set->bindings))
777 err = nft_delset(ctx, set);
782 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
783 err = nft_delobj(ctx, obj);
788 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
789 if (!nft_is_active_next(ctx->net, chain))
794 err = nft_delchain(ctx);
799 err = nft_deltable(ctx);
804 static int nft_flush(struct nft_ctx *ctx, int family)
806 struct nft_af_info *afi;
807 struct nft_table *table, *nt;
808 const struct nlattr * const *nla = ctx->nla;
811 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
812 if (family != AF_UNSPEC && afi->family != family)
816 list_for_each_entry_safe(table, nt, &afi->tables, list) {
817 if (!nft_is_active_next(ctx->net, table))
820 if (nla[NFTA_TABLE_NAME] &&
821 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
826 err = nft_flush_table(ctx);
835 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
836 struct sk_buff *skb, const struct nlmsghdr *nlh,
837 const struct nlattr * const nla[])
839 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
840 u8 genmask = nft_genmask_next(net);
841 struct nft_af_info *afi;
842 struct nft_table *table;
843 int family = nfmsg->nfgen_family;
846 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
847 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
848 return nft_flush(&ctx, family);
850 afi = nf_tables_afinfo_lookup(net, family, false);
854 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
856 return PTR_ERR(table);
861 return nft_flush_table(&ctx);
864 static void nf_tables_table_destroy(struct nft_ctx *ctx)
866 BUG_ON(ctx->table->use > 0);
869 module_put(ctx->afi->owner);
872 int nft_register_chain_type(const struct nf_chain_type *ctype)
876 nfnl_lock(NFNL_SUBSYS_NFTABLES);
877 if (chain_type[ctype->family][ctype->type] != NULL) {
881 chain_type[ctype->family][ctype->type] = ctype;
883 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
886 EXPORT_SYMBOL_GPL(nft_register_chain_type);
888 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
890 nfnl_lock(NFNL_SUBSYS_NFTABLES);
891 chain_type[ctype->family][ctype->type] = NULL;
892 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
894 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
900 static struct nft_chain *
901 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle,
904 struct nft_chain *chain;
906 list_for_each_entry(chain, &table->chains, list) {
907 if (chain->handle == handle &&
908 nft_active_genmask(chain, genmask))
912 return ERR_PTR(-ENOENT);
915 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
916 const struct nlattr *nla,
919 struct nft_chain *chain;
922 return ERR_PTR(-EINVAL);
924 list_for_each_entry(chain, &table->chains, list) {
925 if (!nla_strcmp(nla, chain->name) &&
926 nft_active_genmask(chain, genmask))
930 return ERR_PTR(-ENOENT);
933 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
934 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
935 .len = NFT_TABLE_MAXNAMELEN - 1 },
936 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
937 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
938 .len = NFT_CHAIN_MAXNAMELEN - 1 },
939 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
940 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
941 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
942 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
945 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
946 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
947 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
948 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
949 .len = IFNAMSIZ - 1 },
952 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
954 struct nft_stats *cpu_stats, total;
960 memset(&total, 0, sizeof(total));
961 for_each_possible_cpu(cpu) {
962 cpu_stats = per_cpu_ptr(stats, cpu);
964 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
965 pkts = cpu_stats->pkts;
966 bytes = cpu_stats->bytes;
967 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
969 total.bytes += bytes;
971 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
973 goto nla_put_failure;
975 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
977 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
979 goto nla_put_failure;
981 nla_nest_end(skb, nest);
988 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
989 u32 portid, u32 seq, int event, u32 flags,
990 int family, const struct nft_table *table,
991 const struct nft_chain *chain)
993 struct nlmsghdr *nlh;
994 struct nfgenmsg *nfmsg;
996 event |= NFNL_SUBSYS_NFTABLES << 8;
997 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
999 goto nla_put_failure;
1001 nfmsg = nlmsg_data(nlh);
1002 nfmsg->nfgen_family = family;
1003 nfmsg->version = NFNETLINK_V0;
1004 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1006 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1007 goto nla_put_failure;
1008 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1010 goto nla_put_failure;
1011 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1012 goto nla_put_failure;
1014 if (chain->flags & NFT_BASE_CHAIN) {
1015 const struct nft_base_chain *basechain = nft_base_chain(chain);
1016 const struct nf_hook_ops *ops = &basechain->ops[0];
1017 struct nlattr *nest;
1019 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
1021 goto nla_put_failure;
1022 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1023 goto nla_put_failure;
1024 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1025 goto nla_put_failure;
1026 if (basechain->dev_name[0] &&
1027 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1028 goto nla_put_failure;
1029 nla_nest_end(skb, nest);
1031 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1032 htonl(basechain->policy)))
1033 goto nla_put_failure;
1035 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1036 goto nla_put_failure;
1038 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
1039 goto nla_put_failure;
1042 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1043 goto nla_put_failure;
1045 nlmsg_end(skb, nlh);
1049 nlmsg_trim(skb, nlh);
1053 static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1055 struct sk_buff *skb;
1059 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1063 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1067 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1068 event, 0, ctx->afi->family, ctx->table,
1075 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1076 ctx->report, GFP_KERNEL);
1079 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1085 static int nf_tables_dump_chains(struct sk_buff *skb,
1086 struct netlink_callback *cb)
1088 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1089 const struct nft_af_info *afi;
1090 const struct nft_table *table;
1091 const struct nft_chain *chain;
1092 unsigned int idx = 0, s_idx = cb->args[0];
1093 struct net *net = sock_net(skb->sk);
1094 int family = nfmsg->nfgen_family;
1097 cb->seq = net->nft.base_seq;
1099 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1100 if (family != NFPROTO_UNSPEC && family != afi->family)
1103 list_for_each_entry_rcu(table, &afi->tables, list) {
1104 list_for_each_entry_rcu(chain, &table->chains, list) {
1108 memset(&cb->args[1], 0,
1109 sizeof(cb->args) - sizeof(cb->args[0]));
1110 if (!nft_is_active(net, chain))
1112 if (nf_tables_fill_chain_info(skb, net,
1113 NETLINK_CB(cb->skb).portid,
1117 afi->family, table, chain) < 0)
1120 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1132 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1133 struct sk_buff *skb, const struct nlmsghdr *nlh,
1134 const struct nlattr * const nla[])
1136 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1137 u8 genmask = nft_genmask_cur(net);
1138 const struct nft_af_info *afi;
1139 const struct nft_table *table;
1140 const struct nft_chain *chain;
1141 struct sk_buff *skb2;
1142 int family = nfmsg->nfgen_family;
1145 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1146 struct netlink_dump_control c = {
1147 .dump = nf_tables_dump_chains,
1149 return netlink_dump_start(nlsk, skb, nlh, &c);
1152 afi = nf_tables_afinfo_lookup(net, family, false);
1154 return PTR_ERR(afi);
1156 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1158 return PTR_ERR(table);
1160 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1162 return PTR_ERR(chain);
1164 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1168 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1169 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1170 family, table, chain);
1174 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1181 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1182 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1183 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1186 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1188 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1189 struct nft_stats __percpu *newstats;
1190 struct nft_stats *stats;
1193 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1195 return ERR_PTR(err);
1197 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1198 return ERR_PTR(-EINVAL);
1200 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1201 if (newstats == NULL)
1202 return ERR_PTR(-ENOMEM);
1204 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1205 * are not exposed to userspace.
1208 stats = this_cpu_ptr(newstats);
1209 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1210 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1216 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1217 struct nft_stats __percpu *newstats)
1219 if (newstats == NULL)
1223 struct nft_stats __percpu *oldstats =
1224 nft_dereference(chain->stats);
1226 rcu_assign_pointer(chain->stats, newstats);
1228 free_percpu(oldstats);
1230 rcu_assign_pointer(chain->stats, newstats);
1233 static void nf_tables_chain_destroy(struct nft_chain *chain)
1235 BUG_ON(chain->use > 0);
1237 if (chain->flags & NFT_BASE_CHAIN) {
1238 struct nft_base_chain *basechain = nft_base_chain(chain);
1240 module_put(basechain->type->owner);
1241 free_percpu(basechain->stats);
1242 if (basechain->ops[0].dev != NULL)
1243 dev_put(basechain->ops[0].dev);
1250 struct nft_chain_hook {
1253 const struct nf_chain_type *type;
1254 struct net_device *dev;
1257 static int nft_chain_parse_hook(struct net *net,
1258 const struct nlattr * const nla[],
1259 struct nft_af_info *afi,
1260 struct nft_chain_hook *hook, bool create)
1262 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1263 const struct nf_chain_type *type;
1264 struct net_device *dev;
1267 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1272 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1273 ha[NFTA_HOOK_PRIORITY] == NULL)
1276 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1277 if (hook->num >= afi->nhooks)
1280 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1282 type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT];
1283 if (nla[NFTA_CHAIN_TYPE]) {
1284 type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE],
1287 return PTR_ERR(type);
1289 if (!(type->hook_mask & (1 << hook->num)))
1291 if (!try_module_get(type->owner))
1297 if (afi->flags & NFT_AF_NEEDS_DEV) {
1298 char ifname[IFNAMSIZ];
1300 if (!ha[NFTA_HOOK_DEV]) {
1301 module_put(type->owner);
1305 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1306 dev = dev_get_by_name(net, ifname);
1308 module_put(type->owner);
1312 } else if (ha[NFTA_HOOK_DEV]) {
1313 module_put(type->owner);
1320 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1322 module_put(hook->type->owner);
1323 if (hook->dev != NULL)
1327 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1328 struct sk_buff *skb, const struct nlmsghdr *nlh,
1329 const struct nlattr * const nla[])
1331 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1332 const struct nlattr * uninitialized_var(name);
1333 struct nft_af_info *afi;
1334 struct nft_table *table;
1335 struct nft_chain *chain;
1336 struct nft_base_chain *basechain = NULL;
1337 u8 genmask = nft_genmask_next(net);
1338 int family = nfmsg->nfgen_family;
1339 u8 policy = NF_ACCEPT;
1342 struct nft_stats __percpu *stats;
1347 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1349 afi = nf_tables_afinfo_lookup(net, family, true);
1351 return PTR_ERR(afi);
1353 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1355 return PTR_ERR(table);
1358 name = nla[NFTA_CHAIN_NAME];
1360 if (nla[NFTA_CHAIN_HANDLE]) {
1361 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1362 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
1364 return PTR_ERR(chain);
1366 chain = nf_tables_chain_lookup(table, name, genmask);
1367 if (IS_ERR(chain)) {
1368 if (PTR_ERR(chain) != -ENOENT)
1369 return PTR_ERR(chain);
1374 if (nla[NFTA_CHAIN_POLICY]) {
1375 if ((chain != NULL &&
1376 !(chain->flags & NFT_BASE_CHAIN)))
1379 if (chain == NULL &&
1380 nla[NFTA_CHAIN_HOOK] == NULL)
1383 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1393 if (chain != NULL) {
1394 struct nft_stats *stats = NULL;
1395 struct nft_trans *trans;
1397 if (nlh->nlmsg_flags & NLM_F_EXCL)
1399 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1402 if (nla[NFTA_CHAIN_HOOK]) {
1403 struct nft_base_chain *basechain;
1404 struct nft_chain_hook hook;
1405 struct nf_hook_ops *ops;
1407 if (!(chain->flags & NFT_BASE_CHAIN))
1410 err = nft_chain_parse_hook(net, nla, afi, &hook,
1415 basechain = nft_base_chain(chain);
1416 if (basechain->type != hook.type) {
1417 nft_chain_release_hook(&hook);
1421 for (i = 0; i < afi->nops; i++) {
1422 ops = &basechain->ops[i];
1423 if (ops->hooknum != hook.num ||
1424 ops->priority != hook.priority ||
1425 ops->dev != hook.dev) {
1426 nft_chain_release_hook(&hook);
1430 nft_chain_release_hook(&hook);
1433 if (nla[NFTA_CHAIN_HANDLE] && name) {
1434 struct nft_chain *chain2;
1436 chain2 = nf_tables_chain_lookup(table,
1437 nla[NFTA_CHAIN_NAME],
1440 return PTR_ERR(chain2);
1443 if (nla[NFTA_CHAIN_COUNTERS]) {
1444 if (!(chain->flags & NFT_BASE_CHAIN))
1447 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1449 return PTR_ERR(stats);
1452 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1453 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1454 sizeof(struct nft_trans_chain));
1455 if (trans == NULL) {
1460 nft_trans_chain_stats(trans) = stats;
1461 nft_trans_chain_update(trans) = true;
1463 if (nla[NFTA_CHAIN_POLICY])
1464 nft_trans_chain_policy(trans) = policy;
1466 nft_trans_chain_policy(trans) = -1;
1468 if (nla[NFTA_CHAIN_HANDLE] && name) {
1469 nla_strlcpy(nft_trans_chain_name(trans), name,
1470 NFT_CHAIN_MAXNAMELEN);
1472 list_add_tail(&trans->list, &net->nft.commit_list);
1476 if (table->use == UINT_MAX)
1479 if (nla[NFTA_CHAIN_HOOK]) {
1480 struct nft_chain_hook hook;
1481 struct nf_hook_ops *ops;
1484 err = nft_chain_parse_hook(net, nla, afi, &hook, create);
1488 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1489 if (basechain == NULL) {
1490 nft_chain_release_hook(&hook);
1494 if (hook.dev != NULL)
1495 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1497 if (nla[NFTA_CHAIN_COUNTERS]) {
1498 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1499 if (IS_ERR(stats)) {
1500 nft_chain_release_hook(&hook);
1502 return PTR_ERR(stats);
1504 basechain->stats = stats;
1506 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1507 if (stats == NULL) {
1508 nft_chain_release_hook(&hook);
1512 rcu_assign_pointer(basechain->stats, stats);
1515 hookfn = hook.type->hooks[hook.num];
1516 basechain->type = hook.type;
1517 chain = &basechain->chain;
1519 for (i = 0; i < afi->nops; i++) {
1520 ops = &basechain->ops[i];
1522 ops->hooknum = hook.num;
1523 ops->priority = hook.priority;
1525 ops->hook = afi->hooks[ops->hooknum];
1526 ops->dev = hook.dev;
1529 if (afi->hook_ops_init)
1530 afi->hook_ops_init(ops, i);
1533 chain->flags |= NFT_BASE_CHAIN;
1534 basechain->policy = policy;
1536 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1541 INIT_LIST_HEAD(&chain->rules);
1542 chain->handle = nf_tables_alloc_handle(table);
1543 chain->table = table;
1544 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1546 err = nf_tables_register_hooks(net, table, chain, afi->nops);
1550 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1551 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1556 list_add_tail_rcu(&chain->list, &table->chains);
1559 nf_tables_unregister_hooks(net, table, chain, afi->nops);
1561 nf_tables_chain_destroy(chain);
1565 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1566 struct sk_buff *skb, const struct nlmsghdr *nlh,
1567 const struct nlattr * const nla[])
1569 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1570 u8 genmask = nft_genmask_next(net);
1571 struct nft_af_info *afi;
1572 struct nft_table *table;
1573 struct nft_chain *chain;
1574 int family = nfmsg->nfgen_family;
1577 afi = nf_tables_afinfo_lookup(net, family, false);
1579 return PTR_ERR(afi);
1581 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1583 return PTR_ERR(table);
1585 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1587 return PTR_ERR(chain);
1591 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1593 return nft_delchain(&ctx);
1601 * nft_register_expr - register nf_tables expr type
1604 * Registers the expr type for use with nf_tables. Returns zero on
1605 * success or a negative errno code otherwise.
1607 int nft_register_expr(struct nft_expr_type *type)
1609 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1610 if (type->family == NFPROTO_UNSPEC)
1611 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1613 list_add_rcu(&type->list, &nf_tables_expressions);
1614 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1617 EXPORT_SYMBOL_GPL(nft_register_expr);
1620 * nft_unregister_expr - unregister nf_tables expr type
1623 * Unregisters the expr typefor use with nf_tables.
1625 void nft_unregister_expr(struct nft_expr_type *type)
1627 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1628 list_del_rcu(&type->list);
1629 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1631 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1633 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1636 const struct nft_expr_type *type;
1638 list_for_each_entry(type, &nf_tables_expressions, list) {
1639 if (!nla_strcmp(nla, type->name) &&
1640 (!type->family || type->family == family))
1646 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1649 const struct nft_expr_type *type;
1652 return ERR_PTR(-EINVAL);
1654 type = __nft_expr_type_get(family, nla);
1655 if (type != NULL && try_module_get(type->owner))
1658 #ifdef CONFIG_MODULES
1660 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1661 request_module("nft-expr-%u-%.*s", family,
1662 nla_len(nla), (char *)nla_data(nla));
1663 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1664 if (__nft_expr_type_get(family, nla))
1665 return ERR_PTR(-EAGAIN);
1667 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1668 request_module("nft-expr-%.*s",
1669 nla_len(nla), (char *)nla_data(nla));
1670 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1671 if (__nft_expr_type_get(family, nla))
1672 return ERR_PTR(-EAGAIN);
1675 return ERR_PTR(-ENOENT);
1678 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1679 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1680 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1683 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1684 const struct nft_expr *expr)
1686 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1687 goto nla_put_failure;
1689 if (expr->ops->dump) {
1690 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1692 goto nla_put_failure;
1693 if (expr->ops->dump(skb, expr) < 0)
1694 goto nla_put_failure;
1695 nla_nest_end(skb, data);
1704 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1705 const struct nft_expr *expr)
1707 struct nlattr *nest;
1709 nest = nla_nest_start(skb, attr);
1711 goto nla_put_failure;
1712 if (nf_tables_fill_expr_info(skb, expr) < 0)
1713 goto nla_put_failure;
1714 nla_nest_end(skb, nest);
1721 struct nft_expr_info {
1722 const struct nft_expr_ops *ops;
1723 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1726 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1727 const struct nlattr *nla,
1728 struct nft_expr_info *info)
1730 const struct nft_expr_type *type;
1731 const struct nft_expr_ops *ops;
1732 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1735 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1739 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1741 return PTR_ERR(type);
1743 if (tb[NFTA_EXPR_DATA]) {
1744 err = nla_parse_nested(info->tb, type->maxattr,
1745 tb[NFTA_EXPR_DATA], type->policy);
1749 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1751 if (type->select_ops != NULL) {
1752 ops = type->select_ops(ctx,
1753 (const struct nlattr * const *)info->tb);
1765 module_put(type->owner);
1769 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1770 const struct nft_expr_info *info,
1771 struct nft_expr *expr)
1773 const struct nft_expr_ops *ops = info->ops;
1778 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1790 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1791 struct nft_expr *expr)
1793 if (expr->ops->destroy)
1794 expr->ops->destroy(ctx, expr);
1795 module_put(expr->ops->type->owner);
1798 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1799 const struct nlattr *nla)
1801 struct nft_expr_info info;
1802 struct nft_expr *expr;
1805 err = nf_tables_expr_parse(ctx, nla, &info);
1810 expr = kzalloc(info.ops->size, GFP_KERNEL);
1814 err = nf_tables_newexpr(ctx, &info, expr);
1822 module_put(info.ops->type->owner);
1824 return ERR_PTR(err);
1827 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1829 nf_tables_expr_destroy(ctx, expr);
1837 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1840 struct nft_rule *rule;
1842 // FIXME: this sucks
1843 list_for_each_entry(rule, &chain->rules, list) {
1844 if (handle == rule->handle)
1848 return ERR_PTR(-ENOENT);
1851 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1852 const struct nlattr *nla)
1855 return ERR_PTR(-EINVAL);
1857 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1860 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1861 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
1862 .len = NFT_TABLE_MAXNAMELEN - 1 },
1863 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1864 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1865 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1866 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1867 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1868 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1869 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1870 .len = NFT_USERDATA_MAXLEN },
1873 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1874 u32 portid, u32 seq, int event,
1875 u32 flags, int family,
1876 const struct nft_table *table,
1877 const struct nft_chain *chain,
1878 const struct nft_rule *rule)
1880 struct nlmsghdr *nlh;
1881 struct nfgenmsg *nfmsg;
1882 const struct nft_expr *expr, *next;
1883 struct nlattr *list;
1884 const struct nft_rule *prule;
1885 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1887 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1890 goto nla_put_failure;
1892 nfmsg = nlmsg_data(nlh);
1893 nfmsg->nfgen_family = family;
1894 nfmsg->version = NFNETLINK_V0;
1895 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1897 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1898 goto nla_put_failure;
1899 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1900 goto nla_put_failure;
1901 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1903 goto nla_put_failure;
1905 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1906 prule = list_entry(rule->list.prev, struct nft_rule, list);
1907 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1908 cpu_to_be64(prule->handle),
1910 goto nla_put_failure;
1913 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1915 goto nla_put_failure;
1916 nft_rule_for_each_expr(expr, next, rule) {
1917 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
1918 goto nla_put_failure;
1920 nla_nest_end(skb, list);
1923 struct nft_userdata *udata = nft_userdata(rule);
1924 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1926 goto nla_put_failure;
1929 nlmsg_end(skb, nlh);
1933 nlmsg_trim(skb, nlh);
1937 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1938 const struct nft_rule *rule,
1941 struct sk_buff *skb;
1945 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1949 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1953 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1954 event, 0, ctx->afi->family, ctx->table,
1961 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1962 ctx->report, GFP_KERNEL);
1965 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1971 struct nft_rule_dump_ctx {
1972 char table[NFT_TABLE_MAXNAMELEN];
1973 char chain[NFT_CHAIN_MAXNAMELEN];
1976 static int nf_tables_dump_rules(struct sk_buff *skb,
1977 struct netlink_callback *cb)
1979 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1980 const struct nft_rule_dump_ctx *ctx = cb->data;
1981 const struct nft_af_info *afi;
1982 const struct nft_table *table;
1983 const struct nft_chain *chain;
1984 const struct nft_rule *rule;
1985 unsigned int idx = 0, s_idx = cb->args[0];
1986 struct net *net = sock_net(skb->sk);
1987 int family = nfmsg->nfgen_family;
1990 cb->seq = net->nft.base_seq;
1992 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1993 if (family != NFPROTO_UNSPEC && family != afi->family)
1996 list_for_each_entry_rcu(table, &afi->tables, list) {
1997 if (ctx && ctx->table[0] &&
1998 strcmp(ctx->table, table->name) != 0)
2001 list_for_each_entry_rcu(chain, &table->chains, list) {
2002 if (ctx && ctx->chain[0] &&
2003 strcmp(ctx->chain, chain->name) != 0)
2006 list_for_each_entry_rcu(rule, &chain->rules, list) {
2007 if (!nft_is_active(net, rule))
2012 memset(&cb->args[1], 0,
2013 sizeof(cb->args) - sizeof(cb->args[0]));
2014 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2017 NLM_F_MULTI | NLM_F_APPEND,
2018 afi->family, table, chain, rule) < 0)
2021 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2035 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2041 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2042 struct sk_buff *skb, const struct nlmsghdr *nlh,
2043 const struct nlattr * const nla[])
2045 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2046 u8 genmask = nft_genmask_cur(net);
2047 const struct nft_af_info *afi;
2048 const struct nft_table *table;
2049 const struct nft_chain *chain;
2050 const struct nft_rule *rule;
2051 struct sk_buff *skb2;
2052 int family = nfmsg->nfgen_family;
2055 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2056 struct netlink_dump_control c = {
2057 .dump = nf_tables_dump_rules,
2058 .done = nf_tables_dump_rules_done,
2061 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2062 struct nft_rule_dump_ctx *ctx;
2064 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
2068 if (nla[NFTA_RULE_TABLE])
2069 nla_strlcpy(ctx->table, nla[NFTA_RULE_TABLE],
2070 sizeof(ctx->table));
2071 if (nla[NFTA_RULE_CHAIN])
2072 nla_strlcpy(ctx->chain, nla[NFTA_RULE_CHAIN],
2073 sizeof(ctx->chain));
2077 return netlink_dump_start(nlsk, skb, nlh, &c);
2080 afi = nf_tables_afinfo_lookup(net, family, false);
2082 return PTR_ERR(afi);
2084 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2086 return PTR_ERR(table);
2088 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2090 return PTR_ERR(chain);
2092 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2094 return PTR_ERR(rule);
2096 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2100 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2101 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2102 family, table, chain, rule);
2106 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2113 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2114 struct nft_rule *rule)
2116 struct nft_expr *expr;
2119 * Careful: some expressions might not be initialized in case this
2120 * is called on error from nf_tables_newrule().
2122 expr = nft_expr_first(rule);
2123 while (expr != nft_expr_last(rule) && expr->ops) {
2124 nf_tables_expr_destroy(ctx, expr);
2125 expr = nft_expr_next(expr);
2130 #define NFT_RULE_MAXEXPRS 128
2132 static struct nft_expr_info *info;
2134 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2135 struct sk_buff *skb, const struct nlmsghdr *nlh,
2136 const struct nlattr * const nla[])
2138 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2139 u8 genmask = nft_genmask_next(net);
2140 struct nft_af_info *afi;
2141 struct nft_table *table;
2142 struct nft_chain *chain;
2143 struct nft_rule *rule, *old_rule = NULL;
2144 struct nft_userdata *udata;
2145 struct nft_trans *trans = NULL;
2146 struct nft_expr *expr;
2149 unsigned int size, i, n, ulen = 0, usize = 0;
2152 u64 handle, pos_handle;
2154 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2156 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2158 return PTR_ERR(afi);
2160 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2162 return PTR_ERR(table);
2164 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2166 return PTR_ERR(chain);
2168 if (nla[NFTA_RULE_HANDLE]) {
2169 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2170 rule = __nf_tables_rule_lookup(chain, handle);
2172 return PTR_ERR(rule);
2174 if (nlh->nlmsg_flags & NLM_F_EXCL)
2176 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2181 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2183 handle = nf_tables_alloc_handle(table);
2185 if (chain->use == UINT_MAX)
2189 if (nla[NFTA_RULE_POSITION]) {
2190 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2193 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2194 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2195 if (IS_ERR(old_rule))
2196 return PTR_ERR(old_rule);
2199 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2203 if (nla[NFTA_RULE_EXPRESSIONS]) {
2204 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2206 if (nla_type(tmp) != NFTA_LIST_ELEM)
2208 if (n == NFT_RULE_MAXEXPRS)
2210 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2213 size += info[n].ops->size;
2217 /* Check for overflow of dlen field */
2219 if (size >= 1 << 12)
2222 if (nla[NFTA_RULE_USERDATA]) {
2223 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2225 usize = sizeof(struct nft_userdata) + ulen;
2229 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2233 nft_activate_next(net, rule);
2235 rule->handle = handle;
2237 rule->udata = ulen ? 1 : 0;
2240 udata = nft_userdata(rule);
2241 udata->len = ulen - 1;
2242 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2245 expr = nft_expr_first(rule);
2246 for (i = 0; i < n; i++) {
2247 err = nf_tables_newexpr(&ctx, &info[i], expr);
2251 expr = nft_expr_next(expr);
2254 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2255 if (nft_is_active_next(net, old_rule)) {
2256 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2258 if (trans == NULL) {
2262 nft_deactivate_next(net, old_rule);
2264 list_add_tail_rcu(&rule->list, &old_rule->list);
2269 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2271 list_add_rcu(&rule->list, &old_rule->list);
2273 list_add_tail_rcu(&rule->list, &chain->rules);
2276 list_add_tail_rcu(&rule->list, &old_rule->list);
2278 list_add_rcu(&rule->list, &chain->rules);
2281 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2289 list_del_rcu(&rule->list);
2291 nf_tables_rule_destroy(&ctx, rule);
2293 for (i = 0; i < n; i++) {
2294 if (info[i].ops != NULL)
2295 module_put(info[i].ops->type->owner);
2300 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2301 const struct nlattr *nla)
2303 u32 id = ntohl(nla_get_be32(nla));
2304 struct nft_trans *trans;
2306 list_for_each_entry(trans, &net->nft.commit_list, list) {
2307 struct nft_rule *rule = nft_trans_rule(trans);
2309 if (trans->msg_type == NFT_MSG_NEWRULE &&
2310 id == nft_trans_rule_id(trans))
2313 return ERR_PTR(-ENOENT);
2316 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2317 struct sk_buff *skb, const struct nlmsghdr *nlh,
2318 const struct nlattr * const nla[])
2320 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2321 u8 genmask = nft_genmask_next(net);
2322 struct nft_af_info *afi;
2323 struct nft_table *table;
2324 struct nft_chain *chain = NULL;
2325 struct nft_rule *rule;
2326 int family = nfmsg->nfgen_family, err = 0;
2329 afi = nf_tables_afinfo_lookup(net, family, false);
2331 return PTR_ERR(afi);
2333 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2335 return PTR_ERR(table);
2337 if (nla[NFTA_RULE_CHAIN]) {
2338 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2341 return PTR_ERR(chain);
2344 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2347 if (nla[NFTA_RULE_HANDLE]) {
2348 rule = nf_tables_rule_lookup(chain,
2349 nla[NFTA_RULE_HANDLE]);
2351 return PTR_ERR(rule);
2353 err = nft_delrule(&ctx, rule);
2354 } else if (nla[NFTA_RULE_ID]) {
2355 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2357 return PTR_ERR(rule);
2359 err = nft_delrule(&ctx, rule);
2361 err = nft_delrule_by_chain(&ctx);
2364 list_for_each_entry(chain, &table->chains, list) {
2365 if (!nft_is_active_next(net, chain))
2369 err = nft_delrule_by_chain(&ctx);
2382 static LIST_HEAD(nf_tables_set_ops);
2384 int nft_register_set(struct nft_set_ops *ops)
2386 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2387 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2388 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2391 EXPORT_SYMBOL_GPL(nft_register_set);
2393 void nft_unregister_set(struct nft_set_ops *ops)
2395 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2396 list_del_rcu(&ops->list);
2397 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2399 EXPORT_SYMBOL_GPL(nft_unregister_set);
2402 * Select a set implementation based on the data characteristics and the
2403 * given policy. The total memory use might not be known if no size is
2404 * given, in that case the amount of memory per element is used.
2406 static const struct nft_set_ops *
2407 nft_select_set_ops(const struct nlattr * const nla[],
2408 const struct nft_set_desc *desc,
2409 enum nft_set_policies policy)
2411 const struct nft_set_ops *ops, *bops;
2412 struct nft_set_estimate est, best;
2415 #ifdef CONFIG_MODULES
2416 if (list_empty(&nf_tables_set_ops)) {
2417 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2418 request_module("nft-set");
2419 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2420 if (!list_empty(&nf_tables_set_ops))
2421 return ERR_PTR(-EAGAIN);
2425 if (nla[NFTA_SET_FLAGS] != NULL) {
2426 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2427 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT |
2436 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2437 if ((ops->features & features) != features)
2439 if (!ops->estimate(desc, features, &est))
2443 case NFT_SET_POL_PERFORMANCE:
2444 if (est.lookup < best.lookup)
2446 if (est.lookup == best.lookup) {
2448 if (est.space < best.space)
2450 } else if (est.size < best.size) {
2455 case NFT_SET_POL_MEMORY:
2457 if (est.space < best.space)
2459 if (est.space == best.space &&
2460 est.lookup < best.lookup)
2462 } else if (est.size < best.size) {
2470 if (!try_module_get(ops->owner))
2473 module_put(bops->owner);
2482 return ERR_PTR(-EOPNOTSUPP);
2485 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2486 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2487 .len = NFT_TABLE_MAXNAMELEN - 1 },
2488 [NFTA_SET_NAME] = { .type = NLA_STRING,
2489 .len = NFT_SET_MAXNAMELEN - 1 },
2490 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2491 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2492 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2493 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2494 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2495 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2496 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2497 [NFTA_SET_ID] = { .type = NLA_U32 },
2498 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2499 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2500 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2501 .len = NFT_USERDATA_MAXLEN },
2502 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
2505 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2506 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2509 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2510 const struct sk_buff *skb,
2511 const struct nlmsghdr *nlh,
2512 const struct nlattr * const nla[],
2515 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2516 struct nft_af_info *afi = NULL;
2517 struct nft_table *table = NULL;
2519 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2520 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2522 return PTR_ERR(afi);
2525 if (nla[NFTA_SET_TABLE] != NULL) {
2527 return -EAFNOSUPPORT;
2529 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2532 return PTR_ERR(table);
2535 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
2539 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2540 const struct nlattr *nla, u8 genmask)
2542 struct nft_set *set;
2545 return ERR_PTR(-EINVAL);
2547 list_for_each_entry(set, &table->sets, list) {
2548 if (!nla_strcmp(nla, set->name) &&
2549 nft_active_genmask(set, genmask))
2552 return ERR_PTR(-ENOENT);
2554 EXPORT_SYMBOL_GPL(nf_tables_set_lookup);
2556 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2557 const struct nlattr *nla,
2560 struct nft_trans *trans;
2561 u32 id = ntohl(nla_get_be32(nla));
2563 list_for_each_entry(trans, &net->nft.commit_list, list) {
2564 struct nft_set *set = nft_trans_set(trans);
2566 if (trans->msg_type == NFT_MSG_NEWSET &&
2567 id == nft_trans_set_id(trans) &&
2568 nft_active_genmask(set, genmask))
2571 return ERR_PTR(-ENOENT);
2573 EXPORT_SYMBOL_GPL(nf_tables_set_lookup_byid);
2575 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2578 const struct nft_set *i;
2580 unsigned long *inuse;
2581 unsigned int n = 0, min = 0;
2583 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
2585 if (p[1] != 'd' || strchr(p + 2, '%'))
2588 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2592 list_for_each_entry(i, &ctx->table->sets, list) {
2595 if (!nft_is_active_next(ctx->net, set))
2597 if (!sscanf(i->name, name, &tmp))
2599 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2602 set_bit(tmp - min, inuse);
2605 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2606 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2607 min += BITS_PER_BYTE * PAGE_SIZE;
2608 memset(inuse, 0, PAGE_SIZE);
2611 free_page((unsigned long)inuse);
2614 snprintf(set->name, sizeof(set->name), name, min + n);
2615 list_for_each_entry(i, &ctx->table->sets, list) {
2616 if (!nft_is_active_next(ctx->net, i))
2618 if (!strcmp(set->name, i->name))
2624 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2625 const struct nft_set *set, u16 event, u16 flags)
2627 struct nfgenmsg *nfmsg;
2628 struct nlmsghdr *nlh;
2629 struct nlattr *desc;
2630 u32 portid = ctx->portid;
2633 event |= NFNL_SUBSYS_NFTABLES << 8;
2634 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2637 goto nla_put_failure;
2639 nfmsg = nlmsg_data(nlh);
2640 nfmsg->nfgen_family = ctx->afi->family;
2641 nfmsg->version = NFNETLINK_V0;
2642 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2644 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2645 goto nla_put_failure;
2646 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2647 goto nla_put_failure;
2648 if (set->flags != 0)
2649 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2650 goto nla_put_failure;
2652 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2653 goto nla_put_failure;
2654 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2655 goto nla_put_failure;
2656 if (set->flags & NFT_SET_MAP) {
2657 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2658 goto nla_put_failure;
2659 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2660 goto nla_put_failure;
2662 if (set->flags & NFT_SET_OBJECT &&
2663 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
2664 goto nla_put_failure;
2667 nla_put_be64(skb, NFTA_SET_TIMEOUT,
2668 cpu_to_be64(jiffies_to_msecs(set->timeout)),
2670 goto nla_put_failure;
2672 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2673 goto nla_put_failure;
2675 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2676 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2677 goto nla_put_failure;
2680 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2681 goto nla_put_failure;
2683 desc = nla_nest_start(skb, NFTA_SET_DESC);
2685 goto nla_put_failure;
2687 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2688 goto nla_put_failure;
2689 nla_nest_end(skb, desc);
2691 nlmsg_end(skb, nlh);
2695 nlmsg_trim(skb, nlh);
2699 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2700 const struct nft_set *set,
2701 int event, gfp_t gfp_flags)
2703 struct sk_buff *skb;
2704 u32 portid = ctx->portid;
2708 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2712 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2716 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2722 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2723 ctx->report, gfp_flags);
2726 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2730 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2732 const struct nft_set *set;
2733 unsigned int idx, s_idx = cb->args[0];
2734 struct nft_af_info *afi;
2735 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2736 struct net *net = sock_net(skb->sk);
2737 int cur_family = cb->args[3];
2738 struct nft_ctx *ctx = cb->data, ctx_set;
2744 cb->seq = net->nft.base_seq;
2746 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2747 if (ctx->afi && ctx->afi != afi)
2751 if (afi->family != cur_family)
2756 list_for_each_entry_rcu(table, &afi->tables, list) {
2757 if (ctx->table && ctx->table != table)
2761 if (cur_table != table)
2767 list_for_each_entry_rcu(set, &table->sets, list) {
2770 if (!nft_is_active(net, set))
2774 ctx_set.table = table;
2776 if (nf_tables_fill_set(skb, &ctx_set, set,
2780 cb->args[2] = (unsigned long) table;
2781 cb->args[3] = afi->family;
2784 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2798 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2804 static int nf_tables_getset(struct net *net, struct sock *nlsk,
2805 struct sk_buff *skb, const struct nlmsghdr *nlh,
2806 const struct nlattr * const nla[])
2808 u8 genmask = nft_genmask_cur(net);
2809 const struct nft_set *set;
2811 struct sk_buff *skb2;
2812 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2815 /* Verify existence before starting dump */
2816 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
2820 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2821 struct netlink_dump_control c = {
2822 .dump = nf_tables_dump_sets,
2823 .done = nf_tables_dump_sets_done,
2825 struct nft_ctx *ctx_dump;
2827 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2828 if (ctx_dump == NULL)
2834 return netlink_dump_start(nlsk, skb, nlh, &c);
2837 /* Only accept unspec with dump */
2838 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2839 return -EAFNOSUPPORT;
2840 if (!nla[NFTA_SET_TABLE])
2843 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
2845 return PTR_ERR(set);
2847 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2851 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2855 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2862 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2863 struct nft_set_desc *desc,
2864 const struct nlattr *nla)
2866 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2869 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2873 if (da[NFTA_SET_DESC_SIZE] != NULL)
2874 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2879 static int nf_tables_newset(struct net *net, struct sock *nlsk,
2880 struct sk_buff *skb, const struct nlmsghdr *nlh,
2881 const struct nlattr * const nla[])
2883 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2884 u8 genmask = nft_genmask_next(net);
2885 const struct nft_set_ops *ops;
2886 struct nft_af_info *afi;
2887 struct nft_table *table;
2888 struct nft_set *set;
2890 char name[NFT_SET_MAXNAMELEN];
2894 u32 ktype, dtype, flags, policy, gc_int, objtype;
2895 struct nft_set_desc desc;
2896 unsigned char *udata;
2900 if (nla[NFTA_SET_TABLE] == NULL ||
2901 nla[NFTA_SET_NAME] == NULL ||
2902 nla[NFTA_SET_KEY_LEN] == NULL ||
2903 nla[NFTA_SET_ID] == NULL)
2906 memset(&desc, 0, sizeof(desc));
2908 ktype = NFT_DATA_VALUE;
2909 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2910 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2911 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2915 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2916 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
2920 if (nla[NFTA_SET_FLAGS] != NULL) {
2921 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2922 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2923 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2924 NFT_SET_MAP | NFT_SET_EVAL |
2927 /* Only one of these operations is supported */
2928 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
2929 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
2934 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2935 if (!(flags & NFT_SET_MAP))
2938 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2939 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2940 dtype != NFT_DATA_VERDICT)
2943 if (dtype != NFT_DATA_VERDICT) {
2944 if (nla[NFTA_SET_DATA_LEN] == NULL)
2946 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2947 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
2950 desc.dlen = sizeof(struct nft_verdict);
2951 } else if (flags & NFT_SET_MAP)
2954 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
2955 if (!(flags & NFT_SET_OBJECT))
2958 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
2959 if (objtype == NFT_OBJECT_UNSPEC ||
2960 objtype > NFT_OBJECT_MAX)
2962 } else if (flags & NFT_SET_OBJECT)
2965 objtype = NFT_OBJECT_UNSPEC;
2968 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2969 if (!(flags & NFT_SET_TIMEOUT))
2971 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
2972 nla[NFTA_SET_TIMEOUT])));
2975 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2976 if (!(flags & NFT_SET_TIMEOUT))
2978 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2981 policy = NFT_SET_POL_PERFORMANCE;
2982 if (nla[NFTA_SET_POLICY] != NULL)
2983 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2985 if (nla[NFTA_SET_DESC] != NULL) {
2986 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2991 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2993 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2995 return PTR_ERR(afi);
2997 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
2999 return PTR_ERR(table);
3001 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
3003 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
3005 if (PTR_ERR(set) != -ENOENT)
3006 return PTR_ERR(set);
3008 if (nlh->nlmsg_flags & NLM_F_EXCL)
3010 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3015 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3018 ops = nft_select_set_ops(nla, &desc, policy);
3020 return PTR_ERR(ops);
3023 if (nla[NFTA_SET_USERDATA])
3024 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3027 if (ops->privsize != NULL)
3028 size = ops->privsize(nla);
3031 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3035 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
3036 err = nf_tables_set_alloc_name(&ctx, set, name);
3042 udata = set->data + size;
3043 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3046 INIT_LIST_HEAD(&set->bindings);
3049 set->klen = desc.klen;
3051 set->objtype = objtype;
3052 set->dlen = desc.dlen;
3054 set->size = desc.size;
3055 set->policy = policy;
3058 set->timeout = timeout;
3059 set->gc_int = gc_int;
3061 err = ops->init(set, &desc, nla);
3065 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3069 list_add_tail_rcu(&set->list, &table->sets);
3078 module_put(ops->owner);
3082 static void nft_set_destroy(struct nft_set *set)
3084 set->ops->destroy(set);
3085 module_put(set->ops->owner);
3089 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3091 list_del_rcu(&set->list);
3092 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
3093 nft_set_destroy(set);
3096 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3097 struct sk_buff *skb, const struct nlmsghdr *nlh,
3098 const struct nlattr * const nla[])
3100 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3101 u8 genmask = nft_genmask_next(net);
3102 struct nft_set *set;
3106 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3107 return -EAFNOSUPPORT;
3108 if (nla[NFTA_SET_TABLE] == NULL)
3111 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
3115 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3117 return PTR_ERR(set);
3118 if (!list_empty(&set->bindings))
3121 return nft_delset(&ctx, set);
3124 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3125 struct nft_set *set,
3126 const struct nft_set_iter *iter,
3127 struct nft_set_elem *elem)
3129 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3130 enum nft_registers dreg;
3132 dreg = nft_type_to_reg(set->dtype);
3133 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3134 set->dtype == NFT_DATA_VERDICT ?
3135 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3139 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3140 struct nft_set_binding *binding)
3142 struct nft_set_binding *i;
3143 struct nft_set_iter iter;
3145 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
3148 if (binding->flags & NFT_SET_MAP) {
3149 /* If the set is already bound to the same chain all
3150 * jumps are already validated for that chain.
3152 list_for_each_entry(i, &set->bindings, list) {
3153 if (i->flags & NFT_SET_MAP &&
3154 i->chain == binding->chain)
3158 iter.genmask = nft_genmask_next(ctx->net);
3162 iter.fn = nf_tables_bind_check_setelem;
3165 set->ops->walk(ctx, set, &iter);
3170 binding->chain = ctx->chain;
3171 list_add_tail_rcu(&binding->list, &set->bindings);
3174 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3176 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3177 struct nft_set_binding *binding)
3179 list_del_rcu(&binding->list);
3181 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
3182 nft_is_active(ctx->net, set))
3183 nf_tables_set_destroy(ctx, set);
3185 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3187 const struct nft_set_ext_type nft_set_ext_types[] = {
3188 [NFT_SET_EXT_KEY] = {
3189 .align = __alignof__(u32),
3191 [NFT_SET_EXT_DATA] = {
3192 .align = __alignof__(u32),
3194 [NFT_SET_EXT_EXPR] = {
3195 .align = __alignof__(struct nft_expr),
3197 [NFT_SET_EXT_OBJREF] = {
3198 .len = sizeof(struct nft_object *),
3199 .align = __alignof__(struct nft_object *),
3201 [NFT_SET_EXT_FLAGS] = {
3203 .align = __alignof__(u8),
3205 [NFT_SET_EXT_TIMEOUT] = {
3207 .align = __alignof__(u64),
3209 [NFT_SET_EXT_EXPIRATION] = {
3210 .len = sizeof(unsigned long),
3211 .align = __alignof__(unsigned long),
3213 [NFT_SET_EXT_USERDATA] = {
3214 .len = sizeof(struct nft_userdata),
3215 .align = __alignof__(struct nft_userdata),
3218 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3224 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3225 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3226 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3227 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3228 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3229 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3230 .len = NFT_USERDATA_MAXLEN },
3233 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3234 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3235 .len = NFT_TABLE_MAXNAMELEN - 1 },
3236 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3237 .len = NFT_SET_MAXNAMELEN - 1 },
3238 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3239 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3242 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3243 const struct sk_buff *skb,
3244 const struct nlmsghdr *nlh,
3245 const struct nlattr * const nla[],
3248 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3249 struct nft_af_info *afi;
3250 struct nft_table *table;
3252 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3254 return PTR_ERR(afi);
3256 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3259 return PTR_ERR(table);
3261 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
3265 static int nf_tables_fill_setelem(struct sk_buff *skb,
3266 const struct nft_set *set,
3267 const struct nft_set_elem *elem)
3269 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3270 unsigned char *b = skb_tail_pointer(skb);
3271 struct nlattr *nest;
3273 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3275 goto nla_put_failure;
3277 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3278 NFT_DATA_VALUE, set->klen) < 0)
3279 goto nla_put_failure;
3281 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3282 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3283 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3285 goto nla_put_failure;
3287 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3288 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3289 goto nla_put_failure;
3291 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3292 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3293 (*nft_set_ext_obj(ext))->name) < 0)
3294 goto nla_put_failure;
3296 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3297 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3298 htonl(*nft_set_ext_flags(ext))))
3299 goto nla_put_failure;
3301 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3302 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3303 cpu_to_be64(jiffies_to_msecs(
3304 *nft_set_ext_timeout(ext))),
3306 goto nla_put_failure;
3308 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3309 unsigned long expires, now = jiffies;
3311 expires = *nft_set_ext_expiration(ext);
3312 if (time_before(now, expires))
3317 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3318 cpu_to_be64(jiffies_to_msecs(expires)),
3320 goto nla_put_failure;
3323 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3324 struct nft_userdata *udata;
3326 udata = nft_set_ext_userdata(ext);
3327 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3328 udata->len + 1, udata->data))
3329 goto nla_put_failure;
3332 nla_nest_end(skb, nest);
3340 struct nft_set_dump_args {
3341 const struct netlink_callback *cb;
3342 struct nft_set_iter iter;
3343 struct sk_buff *skb;
3346 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3347 struct nft_set *set,
3348 const struct nft_set_iter *iter,
3349 struct nft_set_elem *elem)
3351 struct nft_set_dump_args *args;
3353 args = container_of(iter, struct nft_set_dump_args, iter);
3354 return nf_tables_fill_setelem(args->skb, set, elem);
3357 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3359 struct net *net = sock_net(skb->sk);
3360 u8 genmask = nft_genmask_cur(net);
3361 struct nft_set *set;
3362 struct nft_set_dump_args args;
3364 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3365 struct nfgenmsg *nfmsg;
3366 struct nlmsghdr *nlh;
3367 struct nlattr *nest;
3371 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3372 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
3376 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
3377 (void *)nla, genmask);
3381 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3384 return PTR_ERR(set);
3386 event = NFT_MSG_NEWSETELEM;
3387 event |= NFNL_SUBSYS_NFTABLES << 8;
3388 portid = NETLINK_CB(cb->skb).portid;
3389 seq = cb->nlh->nlmsg_seq;
3391 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3394 goto nla_put_failure;
3396 nfmsg = nlmsg_data(nlh);
3397 nfmsg->nfgen_family = ctx.afi->family;
3398 nfmsg->version = NFNETLINK_V0;
3399 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
3401 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3402 goto nla_put_failure;
3403 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3404 goto nla_put_failure;
3406 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3408 goto nla_put_failure;
3412 args.iter.genmask = nft_genmask_cur(ctx.net);
3413 args.iter.skip = cb->args[0];
3414 args.iter.count = 0;
3416 args.iter.fn = nf_tables_dump_setelem;
3417 args.iter.flush = false;
3418 set->ops->walk(&ctx, set, &args.iter);
3420 nla_nest_end(skb, nest);
3421 nlmsg_end(skb, nlh);
3423 if (args.iter.err && args.iter.err != -EMSGSIZE)
3424 return args.iter.err;
3425 if (args.iter.count == cb->args[0])
3428 cb->args[0] = args.iter.count;
3435 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3436 struct sk_buff *skb, const struct nlmsghdr *nlh,
3437 const struct nlattr * const nla[])
3439 u8 genmask = nft_genmask_cur(net);
3440 const struct nft_set *set;
3444 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3448 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3451 return PTR_ERR(set);
3453 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3454 struct netlink_dump_control c = {
3455 .dump = nf_tables_dump_set,
3457 return netlink_dump_start(nlsk, skb, nlh, &c);
3462 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3463 const struct nft_ctx *ctx, u32 seq,
3464 u32 portid, int event, u16 flags,
3465 const struct nft_set *set,
3466 const struct nft_set_elem *elem)
3468 struct nfgenmsg *nfmsg;
3469 struct nlmsghdr *nlh;
3470 struct nlattr *nest;
3473 event |= NFNL_SUBSYS_NFTABLES << 8;
3474 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3477 goto nla_put_failure;
3479 nfmsg = nlmsg_data(nlh);
3480 nfmsg->nfgen_family = ctx->afi->family;
3481 nfmsg->version = NFNETLINK_V0;
3482 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3484 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3485 goto nla_put_failure;
3486 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3487 goto nla_put_failure;
3489 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3491 goto nla_put_failure;
3493 err = nf_tables_fill_setelem(skb, set, elem);
3495 goto nla_put_failure;
3497 nla_nest_end(skb, nest);
3499 nlmsg_end(skb, nlh);
3503 nlmsg_trim(skb, nlh);
3507 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3508 const struct nft_set *set,
3509 const struct nft_set_elem *elem,
3510 int event, u16 flags)
3512 struct net *net = ctx->net;
3513 u32 portid = ctx->portid;
3514 struct sk_buff *skb;
3517 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3521 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3525 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3532 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3536 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3540 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3542 struct nft_set *set)
3544 struct nft_trans *trans;
3546 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3550 nft_trans_elem_set(trans) = set;
3554 void *nft_set_elem_init(const struct nft_set *set,
3555 const struct nft_set_ext_tmpl *tmpl,
3556 const u32 *key, const u32 *data,
3557 u64 timeout, gfp_t gfp)
3559 struct nft_set_ext *ext;
3562 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3566 ext = nft_set_elem_ext(set, elem);
3567 nft_set_ext_init(ext, tmpl);
3569 memcpy(nft_set_ext_key(ext), key, set->klen);
3570 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3571 memcpy(nft_set_ext_data(ext), data, set->dlen);
3572 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3573 *nft_set_ext_expiration(ext) =
3575 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3576 *nft_set_ext_timeout(ext) = timeout;
3581 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
3584 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3586 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3587 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3588 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
3589 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3590 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3591 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
3592 (*nft_set_ext_obj(ext))->use--;
3595 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3597 static int nft_setelem_parse_flags(const struct nft_set *set,
3598 const struct nlattr *attr, u32 *flags)
3603 *flags = ntohl(nla_get_be32(attr));
3604 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3606 if (!(set->flags & NFT_SET_INTERVAL) &&
3607 *flags & NFT_SET_ELEM_INTERVAL_END)
3613 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3614 const struct nlattr *attr, u32 nlmsg_flags)
3616 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3617 u8 genmask = nft_genmask_next(ctx->net);
3618 struct nft_data_desc d1, d2;
3619 struct nft_set_ext_tmpl tmpl;
3620 struct nft_set_ext *ext, *ext2;
3621 struct nft_set_elem elem;
3622 struct nft_set_binding *binding;
3623 struct nft_object *obj = NULL;
3624 struct nft_userdata *udata;
3625 struct nft_data data;
3626 enum nft_registers dreg;
3627 struct nft_trans *trans;
3633 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3634 nft_set_elem_policy);
3638 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3641 nft_set_ext_prepare(&tmpl);
3643 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3647 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3649 if (set->flags & NFT_SET_MAP) {
3650 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3651 !(flags & NFT_SET_ELEM_INTERVAL_END))
3653 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3654 flags & NFT_SET_ELEM_INTERVAL_END)
3657 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3662 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3663 if (!(set->flags & NFT_SET_TIMEOUT))
3665 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3666 nla[NFTA_SET_ELEM_TIMEOUT])));
3667 } else if (set->flags & NFT_SET_TIMEOUT) {
3668 timeout = set->timeout;
3671 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3672 nla[NFTA_SET_ELEM_KEY]);
3676 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3679 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3681 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3682 if (timeout != set->timeout)
3683 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3686 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
3687 if (!(set->flags & NFT_SET_OBJECT)) {
3691 obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
3692 set->objtype, genmask);
3697 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
3700 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3701 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3702 nla[NFTA_SET_ELEM_DATA]);
3707 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3710 dreg = nft_type_to_reg(set->dtype);
3711 list_for_each_entry(binding, &set->bindings, list) {
3712 struct nft_ctx bind_ctx = {
3715 .table = ctx->table,
3716 .chain = (struct nft_chain *)binding->chain,
3719 if (!(binding->flags & NFT_SET_MAP))
3722 err = nft_validate_register_store(&bind_ctx, dreg,
3729 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
3732 /* The full maximum length of userdata can exceed the maximum
3733 * offset value (U8_MAX) for following extensions, therefor it
3734 * must be the last extension added.
3737 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3738 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3740 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3745 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
3746 timeout, GFP_KERNEL);
3747 if (elem.priv == NULL)
3750 ext = nft_set_elem_ext(set, elem.priv);
3752 *nft_set_ext_flags(ext) = flags;
3754 udata = nft_set_ext_userdata(ext);
3755 udata->len = ulen - 1;
3756 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3759 *nft_set_ext_obj(ext) = obj;
3763 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3767 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
3768 err = set->ops->insert(ctx->net, set, &elem, &ext2);
3770 if (err == -EEXIST) {
3771 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3772 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
3773 memcmp(nft_set_ext_data(ext),
3774 nft_set_ext_data(ext2), set->dlen) != 0) ||
3775 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3776 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
3777 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
3779 else if (!(nlmsg_flags & NLM_F_EXCL))
3786 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
3791 nft_trans_elem(trans) = elem;
3792 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3796 set->ops->remove(ctx->net, set, &elem);
3802 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3803 nft_data_uninit(&data, d2.type);
3805 nft_data_uninit(&elem.key.val, d1.type);
3810 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3811 struct sk_buff *skb, const struct nlmsghdr *nlh,
3812 const struct nlattr * const nla[])
3814 u8 genmask = nft_genmask_next(net);
3815 const struct nlattr *attr;
3816 struct nft_set *set;
3820 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3823 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3827 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3830 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3831 set = nf_tables_set_lookup_byid(net,
3832 nla[NFTA_SET_ELEM_LIST_SET_ID],
3836 return PTR_ERR(set);
3839 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3842 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3843 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
3850 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3851 const struct nlattr *attr)
3853 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3854 struct nft_set_ext_tmpl tmpl;
3855 struct nft_data_desc desc;
3856 struct nft_set_elem elem;
3857 struct nft_set_ext *ext;
3858 struct nft_trans *trans;
3863 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3864 nft_set_elem_policy);
3869 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3872 nft_set_ext_prepare(&tmpl);
3874 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3878 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3880 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3881 nla[NFTA_SET_ELEM_KEY]);
3886 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3889 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3892 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3894 if (elem.priv == NULL)
3897 ext = nft_set_elem_ext(set, elem.priv);
3899 *nft_set_ext_flags(ext) = flags;
3901 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3902 if (trans == NULL) {
3907 priv = set->ops->deactivate(ctx->net, set, &elem);
3915 nft_trans_elem(trans) = elem;
3916 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3924 nft_data_uninit(&elem.key.val, desc.type);
3929 static int nft_flush_set(const struct nft_ctx *ctx,
3930 struct nft_set *set,
3931 const struct nft_set_iter *iter,
3932 struct nft_set_elem *elem)
3934 struct nft_trans *trans;
3937 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
3938 sizeof(struct nft_trans_elem), GFP_ATOMIC);
3942 if (!set->ops->flush(ctx->net, set, elem->priv)) {
3948 nft_trans_elem_set(trans) = set;
3949 nft_trans_elem(trans) = *elem;
3950 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3958 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3959 struct sk_buff *skb, const struct nlmsghdr *nlh,
3960 const struct nlattr * const nla[])
3962 u8 genmask = nft_genmask_next(net);
3963 const struct nlattr *attr;
3964 struct nft_set *set;
3968 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3972 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3975 return PTR_ERR(set);
3976 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3979 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
3980 struct nft_set_iter iter = {
3982 .fn = nft_flush_set,
3985 set->ops->walk(&ctx, set, &iter);
3990 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3991 err = nft_del_setelem(&ctx, set, attr);
4000 void nft_set_gc_batch_release(struct rcu_head *rcu)
4002 struct nft_set_gc_batch *gcb;
4005 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4006 for (i = 0; i < gcb->head.cnt; i++)
4007 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
4010 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4012 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4015 struct nft_set_gc_batch *gcb;
4017 gcb = kzalloc(sizeof(*gcb), gfp);
4020 gcb->head.set = set;
4023 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4030 * nft_register_obj- register nf_tables stateful object type
4033 * Registers the object type for use with nf_tables. Returns zero on
4034 * success or a negative errno code otherwise.
4036 int nft_register_obj(struct nft_object_type *obj_type)
4038 if (obj_type->type == NFT_OBJECT_UNSPEC)
4041 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4042 list_add_rcu(&obj_type->list, &nf_tables_objects);
4043 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4046 EXPORT_SYMBOL_GPL(nft_register_obj);
4049 * nft_unregister_obj - unregister nf_tables object type
4052 * Unregisters the object type for use with nf_tables.
4054 void nft_unregister_obj(struct nft_object_type *obj_type)
4056 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4057 list_del_rcu(&obj_type->list);
4058 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4060 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4062 struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
4063 const struct nlattr *nla,
4064 u32 objtype, u8 genmask)
4066 struct nft_object *obj;
4068 list_for_each_entry(obj, &table->objects, list) {
4069 if (!nla_strcmp(nla, obj->name) &&
4070 objtype == obj->type->type &&
4071 nft_active_genmask(obj, genmask))
4074 return ERR_PTR(-ENOENT);
4076 EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
4078 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4079 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4080 .len = NFT_TABLE_MAXNAMELEN - 1 },
4081 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4082 .len = NFT_OBJ_MAXNAMELEN - 1 },
4083 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4084 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4087 static struct nft_object *nft_obj_init(const struct nft_object_type *type,
4088 const struct nlattr *attr)
4090 struct nlattr *tb[type->maxattr + 1];
4091 struct nft_object *obj;
4095 err = nla_parse_nested(tb, type->maxattr, attr, type->policy);
4099 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4103 obj = kzalloc(sizeof(struct nft_object) + type->size, GFP_KERNEL);
4107 err = type->init((const struct nlattr * const *)tb, obj);
4116 return ERR_PTR(err);
4119 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
4120 struct nft_object *obj, bool reset)
4122 struct nlattr *nest;
4124 nest = nla_nest_start(skb, attr);
4126 goto nla_put_failure;
4127 if (obj->type->dump(skb, obj, reset) < 0)
4128 goto nla_put_failure;
4129 nla_nest_end(skb, nest);
4136 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4138 const struct nft_object_type *type;
4140 list_for_each_entry(type, &nf_tables_objects, list) {
4141 if (objtype == type->type)
4147 static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4149 const struct nft_object_type *type;
4151 type = __nft_obj_type_get(objtype);
4152 if (type != NULL && try_module_get(type->owner))
4155 #ifdef CONFIG_MODULES
4157 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4158 request_module("nft-obj-%u", objtype);
4159 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4160 if (__nft_obj_type_get(objtype))
4161 return ERR_PTR(-EAGAIN);
4164 return ERR_PTR(-ENOENT);
4167 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4168 struct sk_buff *skb, const struct nlmsghdr *nlh,
4169 const struct nlattr * const nla[])
4171 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4172 const struct nft_object_type *type;
4173 u8 genmask = nft_genmask_next(net);
4174 int family = nfmsg->nfgen_family;
4175 struct nft_af_info *afi;
4176 struct nft_table *table;
4177 struct nft_object *obj;
4182 if (!nla[NFTA_OBJ_TYPE] ||
4183 !nla[NFTA_OBJ_NAME] ||
4184 !nla[NFTA_OBJ_DATA])
4187 afi = nf_tables_afinfo_lookup(net, family, true);
4189 return PTR_ERR(afi);
4191 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4193 return PTR_ERR(table);
4195 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4196 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4203 if (nlh->nlmsg_flags & NLM_F_EXCL)
4209 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4211 type = nft_obj_type_get(objtype);
4213 return PTR_ERR(type);
4215 obj = nft_obj_init(type, nla[NFTA_OBJ_DATA]);
4221 nla_strlcpy(obj->name, nla[NFTA_OBJ_NAME], NFT_OBJ_MAXNAMELEN);
4223 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4227 list_add_tail_rcu(&obj->list, &table->objects);
4231 if (obj->type->destroy)
4232 obj->type->destroy(obj);
4235 module_put(type->owner);
4239 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4240 u32 portid, u32 seq, int event, u32 flags,
4241 int family, const struct nft_table *table,
4242 struct nft_object *obj, bool reset)
4244 struct nfgenmsg *nfmsg;
4245 struct nlmsghdr *nlh;
4247 event |= NFNL_SUBSYS_NFTABLES << 8;
4248 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4250 goto nla_put_failure;
4252 nfmsg = nlmsg_data(nlh);
4253 nfmsg->nfgen_family = family;
4254 nfmsg->version = NFNETLINK_V0;
4255 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4257 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4258 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
4259 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->type->type)) ||
4260 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
4261 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
4262 goto nla_put_failure;
4264 nlmsg_end(skb, nlh);
4268 nlmsg_trim(skb, nlh);
4272 struct nft_obj_filter {
4273 char table[NFT_OBJ_MAXNAMELEN];
4277 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4279 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4280 const struct nft_af_info *afi;
4281 const struct nft_table *table;
4282 unsigned int idx = 0, s_idx = cb->args[0];
4283 struct nft_obj_filter *filter = cb->data;
4284 struct net *net = sock_net(skb->sk);
4285 int family = nfmsg->nfgen_family;
4286 struct nft_object *obj;
4289 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4293 cb->seq = net->nft.base_seq;
4295 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
4296 if (family != NFPROTO_UNSPEC && family != afi->family)
4299 list_for_each_entry_rcu(table, &afi->tables, list) {
4300 list_for_each_entry_rcu(obj, &table->objects, list) {
4301 if (!nft_is_active(net, obj))
4306 memset(&cb->args[1], 0,
4307 sizeof(cb->args) - sizeof(cb->args[0]));
4308 if (filter && filter->table[0] &&
4309 strcmp(filter->table, table->name))
4312 filter->type != NFT_OBJECT_UNSPEC &&
4313 obj->type->type != filter->type)
4316 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4319 NLM_F_MULTI | NLM_F_APPEND,
4320 afi->family, table, obj, reset) < 0)
4323 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4336 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4343 static struct nft_obj_filter *
4344 nft_obj_filter_alloc(const struct nlattr * const nla[])
4346 struct nft_obj_filter *filter;
4348 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
4350 return ERR_PTR(-ENOMEM);
4352 if (nla[NFTA_OBJ_TABLE])
4353 nla_strlcpy(filter->table, nla[NFTA_OBJ_TABLE],
4354 NFT_TABLE_MAXNAMELEN);
4355 if (nla[NFTA_OBJ_TYPE])
4356 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4361 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
4362 struct sk_buff *skb, const struct nlmsghdr *nlh,
4363 const struct nlattr * const nla[])
4365 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4366 u8 genmask = nft_genmask_cur(net);
4367 int family = nfmsg->nfgen_family;
4368 const struct nft_af_info *afi;
4369 const struct nft_table *table;
4370 struct nft_object *obj;
4371 struct sk_buff *skb2;
4376 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4377 struct netlink_dump_control c = {
4378 .dump = nf_tables_dump_obj,
4379 .done = nf_tables_dump_obj_done,
4382 if (nla[NFTA_OBJ_TABLE] ||
4383 nla[NFTA_OBJ_TYPE]) {
4384 struct nft_obj_filter *filter;
4386 filter = nft_obj_filter_alloc(nla);
4392 return netlink_dump_start(nlsk, skb, nlh, &c);
4395 if (!nla[NFTA_OBJ_NAME] ||
4396 !nla[NFTA_OBJ_TYPE])
4399 afi = nf_tables_afinfo_lookup(net, family, false);
4401 return PTR_ERR(afi);
4403 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4405 return PTR_ERR(table);
4407 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4408 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4410 return PTR_ERR(obj);
4412 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4416 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4419 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
4420 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
4421 family, table, obj, reset);
4425 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4433 static void nft_obj_destroy(struct nft_object *obj)
4435 if (obj->type->destroy)
4436 obj->type->destroy(obj);
4438 module_put(obj->type->owner);
4442 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
4443 struct sk_buff *skb, const struct nlmsghdr *nlh,
4444 const struct nlattr * const nla[])
4446 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4447 u8 genmask = nft_genmask_next(net);
4448 int family = nfmsg->nfgen_family;
4449 struct nft_af_info *afi;
4450 struct nft_table *table;
4451 struct nft_object *obj;
4455 if (!nla[NFTA_OBJ_TYPE] ||
4456 !nla[NFTA_OBJ_NAME])
4459 afi = nf_tables_afinfo_lookup(net, family, true);
4461 return PTR_ERR(afi);
4463 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4465 return PTR_ERR(table);
4467 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4468 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4470 return PTR_ERR(obj);
4474 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4476 return nft_delobj(&ctx, obj);
4479 int nft_obj_notify(struct net *net, struct nft_table *table,
4480 struct nft_object *obj, u32 portid, u32 seq, int event,
4481 int family, int report, gfp_t gfp)
4483 struct sk_buff *skb;
4487 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4491 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
4495 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
4502 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
4505 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
4509 EXPORT_SYMBOL_GPL(nft_obj_notify);
4511 static int nf_tables_obj_notify(const struct nft_ctx *ctx,
4512 struct nft_object *obj, int event)
4514 return nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
4515 ctx->seq, event, ctx->afi->family, ctx->report,
4519 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
4520 u32 portid, u32 seq)
4522 struct nlmsghdr *nlh;
4523 struct nfgenmsg *nfmsg;
4524 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
4526 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
4528 goto nla_put_failure;
4530 nfmsg = nlmsg_data(nlh);
4531 nfmsg->nfgen_family = AF_UNSPEC;
4532 nfmsg->version = NFNETLINK_V0;
4533 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4535 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
4536 goto nla_put_failure;
4538 nlmsg_end(skb, nlh);
4542 nlmsg_trim(skb, nlh);
4546 static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
4548 struct nlmsghdr *nlh = nlmsg_hdr(skb);
4549 struct sk_buff *skb2;
4552 if (nlmsg_report(nlh) &&
4553 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4557 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4561 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4568 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
4569 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
4572 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4578 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
4579 struct sk_buff *skb, const struct nlmsghdr *nlh,
4580 const struct nlattr * const nla[])
4582 struct sk_buff *skb2;
4585 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4589 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4594 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4600 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
4601 [NFT_MSG_NEWTABLE] = {
4602 .call_batch = nf_tables_newtable,
4603 .attr_count = NFTA_TABLE_MAX,
4604 .policy = nft_table_policy,
4606 [NFT_MSG_GETTABLE] = {
4607 .call = nf_tables_gettable,
4608 .attr_count = NFTA_TABLE_MAX,
4609 .policy = nft_table_policy,
4611 [NFT_MSG_DELTABLE] = {
4612 .call_batch = nf_tables_deltable,
4613 .attr_count = NFTA_TABLE_MAX,
4614 .policy = nft_table_policy,
4616 [NFT_MSG_NEWCHAIN] = {
4617 .call_batch = nf_tables_newchain,
4618 .attr_count = NFTA_CHAIN_MAX,
4619 .policy = nft_chain_policy,
4621 [NFT_MSG_GETCHAIN] = {
4622 .call = nf_tables_getchain,
4623 .attr_count = NFTA_CHAIN_MAX,
4624 .policy = nft_chain_policy,
4626 [NFT_MSG_DELCHAIN] = {
4627 .call_batch = nf_tables_delchain,
4628 .attr_count = NFTA_CHAIN_MAX,
4629 .policy = nft_chain_policy,
4631 [NFT_MSG_NEWRULE] = {
4632 .call_batch = nf_tables_newrule,
4633 .attr_count = NFTA_RULE_MAX,
4634 .policy = nft_rule_policy,
4636 [NFT_MSG_GETRULE] = {
4637 .call = nf_tables_getrule,
4638 .attr_count = NFTA_RULE_MAX,
4639 .policy = nft_rule_policy,
4641 [NFT_MSG_DELRULE] = {
4642 .call_batch = nf_tables_delrule,
4643 .attr_count = NFTA_RULE_MAX,
4644 .policy = nft_rule_policy,
4646 [NFT_MSG_NEWSET] = {
4647 .call_batch = nf_tables_newset,
4648 .attr_count = NFTA_SET_MAX,
4649 .policy = nft_set_policy,
4651 [NFT_MSG_GETSET] = {
4652 .call = nf_tables_getset,
4653 .attr_count = NFTA_SET_MAX,
4654 .policy = nft_set_policy,
4656 [NFT_MSG_DELSET] = {
4657 .call_batch = nf_tables_delset,
4658 .attr_count = NFTA_SET_MAX,
4659 .policy = nft_set_policy,
4661 [NFT_MSG_NEWSETELEM] = {
4662 .call_batch = nf_tables_newsetelem,
4663 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4664 .policy = nft_set_elem_list_policy,
4666 [NFT_MSG_GETSETELEM] = {
4667 .call = nf_tables_getsetelem,
4668 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4669 .policy = nft_set_elem_list_policy,
4671 [NFT_MSG_DELSETELEM] = {
4672 .call_batch = nf_tables_delsetelem,
4673 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4674 .policy = nft_set_elem_list_policy,
4676 [NFT_MSG_GETGEN] = {
4677 .call = nf_tables_getgen,
4679 [NFT_MSG_NEWOBJ] = {
4680 .call_batch = nf_tables_newobj,
4681 .attr_count = NFTA_OBJ_MAX,
4682 .policy = nft_obj_policy,
4684 [NFT_MSG_GETOBJ] = {
4685 .call = nf_tables_getobj,
4686 .attr_count = NFTA_OBJ_MAX,
4687 .policy = nft_obj_policy,
4689 [NFT_MSG_DELOBJ] = {
4690 .call_batch = nf_tables_delobj,
4691 .attr_count = NFTA_OBJ_MAX,
4692 .policy = nft_obj_policy,
4694 [NFT_MSG_GETOBJ_RESET] = {
4695 .call = nf_tables_getobj,
4696 .attr_count = NFTA_OBJ_MAX,
4697 .policy = nft_obj_policy,
4701 static void nft_chain_commit_update(struct nft_trans *trans)
4703 struct nft_base_chain *basechain;
4705 if (nft_trans_chain_name(trans)[0])
4706 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
4708 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
4711 basechain = nft_base_chain(trans->ctx.chain);
4712 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
4714 switch (nft_trans_chain_policy(trans)) {
4717 basechain->policy = nft_trans_chain_policy(trans);
4722 static void nf_tables_commit_release(struct nft_trans *trans)
4724 switch (trans->msg_type) {
4725 case NFT_MSG_DELTABLE:
4726 nf_tables_table_destroy(&trans->ctx);
4728 case NFT_MSG_DELCHAIN:
4729 nf_tables_chain_destroy(trans->ctx.chain);
4731 case NFT_MSG_DELRULE:
4732 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4734 case NFT_MSG_DELSET:
4735 nft_set_destroy(nft_trans_set(trans));
4737 case NFT_MSG_DELSETELEM:
4738 nft_set_elem_destroy(nft_trans_elem_set(trans),
4739 nft_trans_elem(trans).priv, true);
4741 case NFT_MSG_DELOBJ:
4742 nft_obj_destroy(nft_trans_obj(trans));
4748 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
4750 struct nft_trans *trans, *next;
4751 struct nft_trans_elem *te;
4753 /* Bump generation counter, invalidate any dump in progress */
4754 while (++net->nft.base_seq == 0);
4756 /* A new generation has just started */
4757 net->nft.gencursor = nft_gencursor_next(net);
4759 /* Make sure all packets have left the previous generation before
4760 * purging old rules.
4764 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4765 switch (trans->msg_type) {
4766 case NFT_MSG_NEWTABLE:
4767 if (nft_trans_table_update(trans)) {
4768 if (!nft_trans_table_enable(trans)) {
4769 nf_tables_table_disable(net,
4772 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4775 nft_clear(net, trans->ctx.table);
4777 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
4778 nft_trans_destroy(trans);
4780 case NFT_MSG_DELTABLE:
4781 list_del_rcu(&trans->ctx.table->list);
4782 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
4784 case NFT_MSG_NEWCHAIN:
4785 if (nft_trans_chain_update(trans))
4786 nft_chain_commit_update(trans);
4788 nft_clear(net, trans->ctx.chain);
4790 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
4791 nft_trans_destroy(trans);
4793 case NFT_MSG_DELCHAIN:
4794 list_del_rcu(&trans->ctx.chain->list);
4795 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
4796 nf_tables_unregister_hooks(trans->ctx.net,
4799 trans->ctx.afi->nops);
4801 case NFT_MSG_NEWRULE:
4802 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4803 nf_tables_rule_notify(&trans->ctx,
4804 nft_trans_rule(trans),
4806 nft_trans_destroy(trans);
4808 case NFT_MSG_DELRULE:
4809 list_del_rcu(&nft_trans_rule(trans)->list);
4810 nf_tables_rule_notify(&trans->ctx,
4811 nft_trans_rule(trans),
4814 case NFT_MSG_NEWSET:
4815 nft_clear(net, nft_trans_set(trans));
4816 /* This avoids hitting -EBUSY when deleting the table
4817 * from the transaction.
4819 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4820 !list_empty(&nft_trans_set(trans)->bindings))
4821 trans->ctx.table->use--;
4823 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4824 NFT_MSG_NEWSET, GFP_KERNEL);
4825 nft_trans_destroy(trans);
4827 case NFT_MSG_DELSET:
4828 list_del_rcu(&nft_trans_set(trans)->list);
4829 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4830 NFT_MSG_DELSET, GFP_KERNEL);
4832 case NFT_MSG_NEWSETELEM:
4833 te = (struct nft_trans_elem *)trans->data;
4835 te->set->ops->activate(net, te->set, &te->elem);
4836 nf_tables_setelem_notify(&trans->ctx, te->set,
4838 NFT_MSG_NEWSETELEM, 0);
4839 nft_trans_destroy(trans);
4841 case NFT_MSG_DELSETELEM:
4842 te = (struct nft_trans_elem *)trans->data;
4844 nf_tables_setelem_notify(&trans->ctx, te->set,
4846 NFT_MSG_DELSETELEM, 0);
4847 te->set->ops->remove(net, te->set, &te->elem);
4848 atomic_dec(&te->set->nelems);
4851 case NFT_MSG_NEWOBJ:
4852 nft_clear(net, nft_trans_obj(trans));
4853 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4855 nft_trans_destroy(trans);
4857 case NFT_MSG_DELOBJ:
4858 list_del_rcu(&nft_trans_obj(trans)->list);
4859 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4867 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4868 list_del(&trans->list);
4869 nf_tables_commit_release(trans);
4872 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
4877 static void nf_tables_abort_release(struct nft_trans *trans)
4879 switch (trans->msg_type) {
4880 case NFT_MSG_NEWTABLE:
4881 nf_tables_table_destroy(&trans->ctx);
4883 case NFT_MSG_NEWCHAIN:
4884 nf_tables_chain_destroy(trans->ctx.chain);
4886 case NFT_MSG_NEWRULE:
4887 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4889 case NFT_MSG_NEWSET:
4890 nft_set_destroy(nft_trans_set(trans));
4892 case NFT_MSG_NEWSETELEM:
4893 nft_set_elem_destroy(nft_trans_elem_set(trans),
4894 nft_trans_elem(trans).priv, true);
4896 case NFT_MSG_NEWOBJ:
4897 nft_obj_destroy(nft_trans_obj(trans));
4903 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
4905 struct nft_trans *trans, *next;
4906 struct nft_trans_elem *te;
4908 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4910 switch (trans->msg_type) {
4911 case NFT_MSG_NEWTABLE:
4912 if (nft_trans_table_update(trans)) {
4913 if (nft_trans_table_enable(trans)) {
4914 nf_tables_table_disable(net,
4917 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4919 nft_trans_destroy(trans);
4921 list_del_rcu(&trans->ctx.table->list);
4924 case NFT_MSG_DELTABLE:
4925 nft_clear(trans->ctx.net, trans->ctx.table);
4926 nft_trans_destroy(trans);
4928 case NFT_MSG_NEWCHAIN:
4929 if (nft_trans_chain_update(trans)) {
4930 free_percpu(nft_trans_chain_stats(trans));
4932 nft_trans_destroy(trans);
4934 trans->ctx.table->use--;
4935 list_del_rcu(&trans->ctx.chain->list);
4936 nf_tables_unregister_hooks(trans->ctx.net,
4939 trans->ctx.afi->nops);
4942 case NFT_MSG_DELCHAIN:
4943 trans->ctx.table->use++;
4944 nft_clear(trans->ctx.net, trans->ctx.chain);
4945 nft_trans_destroy(trans);
4947 case NFT_MSG_NEWRULE:
4948 trans->ctx.chain->use--;
4949 list_del_rcu(&nft_trans_rule(trans)->list);
4951 case NFT_MSG_DELRULE:
4952 trans->ctx.chain->use++;
4953 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4954 nft_trans_destroy(trans);
4956 case NFT_MSG_NEWSET:
4957 trans->ctx.table->use--;
4958 list_del_rcu(&nft_trans_set(trans)->list);
4960 case NFT_MSG_DELSET:
4961 trans->ctx.table->use++;
4962 nft_clear(trans->ctx.net, nft_trans_set(trans));
4963 nft_trans_destroy(trans);
4965 case NFT_MSG_NEWSETELEM:
4966 te = (struct nft_trans_elem *)trans->data;
4968 te->set->ops->remove(net, te->set, &te->elem);
4969 atomic_dec(&te->set->nelems);
4971 case NFT_MSG_DELSETELEM:
4972 te = (struct nft_trans_elem *)trans->data;
4974 te->set->ops->activate(net, te->set, &te->elem);
4977 nft_trans_destroy(trans);
4979 case NFT_MSG_NEWOBJ:
4980 trans->ctx.table->use--;
4981 list_del_rcu(&nft_trans_obj(trans)->list);
4983 case NFT_MSG_DELOBJ:
4984 trans->ctx.table->use++;
4985 nft_clear(trans->ctx.net, nft_trans_obj(trans));
4986 nft_trans_destroy(trans);
4993 list_for_each_entry_safe_reverse(trans, next,
4994 &net->nft.commit_list, list) {
4995 list_del(&trans->list);
4996 nf_tables_abort_release(trans);
5002 static bool nf_tables_valid_genid(struct net *net, u32 genid)
5004 return net->nft.base_seq == genid;
5007 static const struct nfnetlink_subsystem nf_tables_subsys = {
5008 .name = "nf_tables",
5009 .subsys_id = NFNL_SUBSYS_NFTABLES,
5010 .cb_count = NFT_MSG_MAX,
5012 .commit = nf_tables_commit,
5013 .abort = nf_tables_abort,
5014 .valid_genid = nf_tables_valid_genid,
5017 int nft_chain_validate_dependency(const struct nft_chain *chain,
5018 enum nft_chain_type type)
5020 const struct nft_base_chain *basechain;
5022 if (chain->flags & NFT_BASE_CHAIN) {
5023 basechain = nft_base_chain(chain);
5024 if (basechain->type->type != type)
5029 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
5031 int nft_chain_validate_hooks(const struct nft_chain *chain,
5032 unsigned int hook_flags)
5034 struct nft_base_chain *basechain;
5036 if (chain->flags & NFT_BASE_CHAIN) {
5037 basechain = nft_base_chain(chain);
5039 if ((1 << basechain->ops[0].hooknum) & hook_flags)
5047 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
5050 * Loop detection - walk through the ruleset beginning at the destination chain
5051 * of a new jump until either the source chain is reached (loop) or all
5052 * reachable chains have been traversed.
5054 * The loop check is performed whenever a new jump verdict is added to an
5055 * expression or verdict map or a verdict map is bound to a new chain.
5058 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5059 const struct nft_chain *chain);
5061 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
5062 struct nft_set *set,
5063 const struct nft_set_iter *iter,
5064 struct nft_set_elem *elem)
5066 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5067 const struct nft_data *data;
5069 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5070 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
5073 data = nft_set_ext_data(ext);
5074 switch (data->verdict.code) {
5077 return nf_tables_check_loops(ctx, data->verdict.chain);
5083 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5084 const struct nft_chain *chain)
5086 const struct nft_rule *rule;
5087 const struct nft_expr *expr, *last;
5088 struct nft_set *set;
5089 struct nft_set_binding *binding;
5090 struct nft_set_iter iter;
5092 if (ctx->chain == chain)
5095 list_for_each_entry(rule, &chain->rules, list) {
5096 nft_rule_for_each_expr(expr, last, rule) {
5097 const struct nft_data *data = NULL;
5100 if (!expr->ops->validate)
5103 err = expr->ops->validate(ctx, expr, &data);
5110 switch (data->verdict.code) {
5113 err = nf_tables_check_loops(ctx,
5114 data->verdict.chain);
5123 list_for_each_entry(set, &ctx->table->sets, list) {
5124 if (!nft_is_active_next(ctx->net, set))
5126 if (!(set->flags & NFT_SET_MAP) ||
5127 set->dtype != NFT_DATA_VERDICT)
5130 list_for_each_entry(binding, &set->bindings, list) {
5131 if (!(binding->flags & NFT_SET_MAP) ||
5132 binding->chain != chain)
5135 iter.genmask = nft_genmask_next(ctx->net);
5139 iter.fn = nf_tables_loop_check_setelem;
5142 set->ops->walk(ctx, set, &iter);
5152 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
5154 * @attr: netlink attribute to fetch value from
5155 * @max: maximum value to be stored in dest
5156 * @dest: pointer to the variable
5158 * Parse, check and store a given u32 netlink attribute into variable.
5159 * This function returns -ERANGE if the value goes over maximum value.
5160 * Otherwise a 0 is returned and the attribute value is stored in the
5161 * destination variable.
5163 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
5167 val = ntohl(nla_get_be32(attr));
5174 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
5177 * nft_parse_register - parse a register value from a netlink attribute
5179 * @attr: netlink attribute
5181 * Parse and translate a register value from a netlink attribute.
5182 * Registers used to be 128 bit wide, these register numbers will be
5183 * mapped to the corresponding 32 bit register numbers.
5185 unsigned int nft_parse_register(const struct nlattr *attr)
5189 reg = ntohl(nla_get_be32(attr));
5191 case NFT_REG_VERDICT...NFT_REG_4:
5192 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
5194 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
5197 EXPORT_SYMBOL_GPL(nft_parse_register);
5200 * nft_dump_register - dump a register value to a netlink attribute
5202 * @skb: socket buffer
5203 * @attr: attribute number
5204 * @reg: register number
5206 * Construct a netlink attribute containing the register number. For
5207 * compatibility reasons, register numbers being a multiple of 4 are
5208 * translated to the corresponding 128 bit register numbers.
5210 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
5212 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
5213 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
5215 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
5217 return nla_put_be32(skb, attr, htonl(reg));
5219 EXPORT_SYMBOL_GPL(nft_dump_register);
5222 * nft_validate_register_load - validate a load from a register
5224 * @reg: the register number
5225 * @len: the length of the data
5227 * Validate that the input register is one of the general purpose
5228 * registers and that the length of the load is within the bounds.
5230 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
5232 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5236 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
5241 EXPORT_SYMBOL_GPL(nft_validate_register_load);
5244 * nft_validate_register_store - validate an expressions' register store
5246 * @ctx: context of the expression performing the load
5247 * @reg: the destination register number
5248 * @data: the data to load
5249 * @type: the data type
5250 * @len: the length of the data
5252 * Validate that a data load uses the appropriate data type for
5253 * the destination register and the length is within the bounds.
5254 * A value of NULL for the data means that its runtime gathered
5257 int nft_validate_register_store(const struct nft_ctx *ctx,
5258 enum nft_registers reg,
5259 const struct nft_data *data,
5260 enum nft_data_types type, unsigned int len)
5265 case NFT_REG_VERDICT:
5266 if (type != NFT_DATA_VERDICT)
5270 (data->verdict.code == NFT_GOTO ||
5271 data->verdict.code == NFT_JUMP)) {
5272 err = nf_tables_check_loops(ctx, data->verdict.chain);
5276 if (ctx->chain->level + 1 >
5277 data->verdict.chain->level) {
5278 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
5280 data->verdict.chain->level = ctx->chain->level + 1;
5286 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5290 if (reg * NFT_REG32_SIZE + len >
5291 FIELD_SIZEOF(struct nft_regs, data))
5294 if (data != NULL && type != NFT_DATA_VALUE)
5299 EXPORT_SYMBOL_GPL(nft_validate_register_store);
5301 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
5302 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
5303 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
5304 .len = NFT_CHAIN_MAXNAMELEN - 1 },
5307 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
5308 struct nft_data_desc *desc, const struct nlattr *nla)
5310 u8 genmask = nft_genmask_next(ctx->net);
5311 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
5312 struct nft_chain *chain;
5315 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
5319 if (!tb[NFTA_VERDICT_CODE])
5321 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
5323 switch (data->verdict.code) {
5325 switch (data->verdict.code & NF_VERDICT_MASK) {
5340 if (!tb[NFTA_VERDICT_CHAIN])
5342 chain = nf_tables_chain_lookup(ctx->table,
5343 tb[NFTA_VERDICT_CHAIN], genmask);
5345 return PTR_ERR(chain);
5346 if (chain->flags & NFT_BASE_CHAIN)
5350 data->verdict.chain = chain;
5354 desc->len = sizeof(data->verdict);
5355 desc->type = NFT_DATA_VERDICT;
5359 static void nft_verdict_uninit(const struct nft_data *data)
5361 switch (data->verdict.code) {
5364 data->verdict.chain->use--;
5369 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
5371 struct nlattr *nest;
5373 nest = nla_nest_start(skb, type);
5375 goto nla_put_failure;
5377 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
5378 goto nla_put_failure;
5383 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
5385 goto nla_put_failure;
5387 nla_nest_end(skb, nest);
5394 static int nft_value_init(const struct nft_ctx *ctx,
5395 struct nft_data *data, unsigned int size,
5396 struct nft_data_desc *desc, const struct nlattr *nla)
5406 nla_memcpy(data->data, nla, len);
5407 desc->type = NFT_DATA_VALUE;
5412 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
5415 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
5418 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
5419 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
5420 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
5424 * nft_data_init - parse nf_tables data netlink attributes
5426 * @ctx: context of the expression using the data
5427 * @data: destination struct nft_data
5428 * @size: maximum data length
5429 * @desc: data description
5430 * @nla: netlink attribute containing data
5432 * Parse the netlink data attributes and initialize a struct nft_data.
5433 * The type and length of data are returned in the data description.
5435 * The caller can indicate that it only wants to accept data of type
5436 * NFT_DATA_VALUE by passing NULL for the ctx argument.
5438 int nft_data_init(const struct nft_ctx *ctx,
5439 struct nft_data *data, unsigned int size,
5440 struct nft_data_desc *desc, const struct nlattr *nla)
5442 struct nlattr *tb[NFTA_DATA_MAX + 1];
5445 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
5449 if (tb[NFTA_DATA_VALUE])
5450 return nft_value_init(ctx, data, size, desc,
5451 tb[NFTA_DATA_VALUE]);
5452 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
5453 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
5456 EXPORT_SYMBOL_GPL(nft_data_init);
5459 * nft_data_uninit - release a nft_data item
5461 * @data: struct nft_data to release
5462 * @type: type of data
5464 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5465 * all others need to be released by calling this function.
5467 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
5469 if (type < NFT_DATA_VERDICT)
5472 case NFT_DATA_VERDICT:
5473 return nft_verdict_uninit(data);
5478 EXPORT_SYMBOL_GPL(nft_data_uninit);
5480 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
5481 enum nft_data_types type, unsigned int len)
5483 struct nlattr *nest;
5486 nest = nla_nest_start(skb, attr);
5491 case NFT_DATA_VALUE:
5492 err = nft_value_dump(skb, data, len);
5494 case NFT_DATA_VERDICT:
5495 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
5502 nla_nest_end(skb, nest);
5505 EXPORT_SYMBOL_GPL(nft_data_dump);
5507 static int __net_init nf_tables_init_net(struct net *net)
5509 INIT_LIST_HEAD(&net->nft.af_info);
5510 INIT_LIST_HEAD(&net->nft.commit_list);
5511 net->nft.base_seq = 1;
5515 int __nft_release_basechain(struct nft_ctx *ctx)
5517 struct nft_rule *rule, *nr;
5519 BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
5521 nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
5523 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
5524 list_del(&rule->list);
5526 nf_tables_rule_destroy(ctx, rule);
5528 list_del(&ctx->chain->list);
5530 nf_tables_chain_destroy(ctx->chain);
5534 EXPORT_SYMBOL_GPL(__nft_release_basechain);
5536 /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
5537 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
5539 struct nft_table *table, *nt;
5540 struct nft_chain *chain, *nc;
5541 struct nft_object *obj, *ne;
5542 struct nft_rule *rule, *nr;
5543 struct nft_set *set, *ns;
5544 struct nft_ctx ctx = {
5549 list_for_each_entry_safe(table, nt, &afi->tables, list) {
5550 list_for_each_entry(chain, &table->chains, list)
5551 nf_tables_unregister_hooks(net, table, chain,
5553 /* No packets are walking on these chains anymore. */
5555 list_for_each_entry(chain, &table->chains, list) {
5557 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
5558 list_del(&rule->list);
5560 nf_tables_rule_destroy(&ctx, rule);
5563 list_for_each_entry_safe(set, ns, &table->sets, list) {
5564 list_del(&set->list);
5566 nft_set_destroy(set);
5568 list_for_each_entry_safe(obj, ne, &table->objects, list) {
5569 list_del(&obj->list);
5571 nft_obj_destroy(obj);
5573 list_for_each_entry_safe(chain, nc, &table->chains, list) {
5574 list_del(&chain->list);
5576 nf_tables_chain_destroy(chain);
5578 list_del(&table->list);
5579 nf_tables_table_destroy(&ctx);
5583 static struct pernet_operations nf_tables_net_ops = {
5584 .init = nf_tables_init_net,
5587 static int __init nf_tables_module_init(void)
5591 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
5598 err = nf_tables_core_module_init();
5602 err = nfnetlink_subsys_register(&nf_tables_subsys);
5606 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
5607 return register_pernet_subsys(&nf_tables_net_ops);
5609 nf_tables_core_module_exit();
5616 static void __exit nf_tables_module_exit(void)
5618 unregister_pernet_subsys(&nf_tables_net_ops);
5619 nfnetlink_subsys_unregister(&nf_tables_subsys);
5621 nf_tables_core_module_exit();
5625 module_init(nf_tables_module_init);
5626 module_exit(nf_tables_module_exit);
5628 MODULE_LICENSE("GPL");
5629 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
5630 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);