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 void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
470 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
473 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
477 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
478 event, 0, ctx->afi->family, ctx->table);
484 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
485 ctx->report, GFP_KERNEL);
488 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
491 static int nf_tables_dump_tables(struct sk_buff *skb,
492 struct netlink_callback *cb)
494 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
495 const struct nft_af_info *afi;
496 const struct nft_table *table;
497 unsigned int idx = 0, s_idx = cb->args[0];
498 struct net *net = sock_net(skb->sk);
499 int family = nfmsg->nfgen_family;
502 cb->seq = net->nft.base_seq;
504 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
505 if (family != NFPROTO_UNSPEC && family != afi->family)
508 list_for_each_entry_rcu(table, &afi->tables, list) {
512 memset(&cb->args[1], 0,
513 sizeof(cb->args) - sizeof(cb->args[0]));
514 if (!nft_is_active(net, table))
516 if (nf_tables_fill_table_info(skb, net,
517 NETLINK_CB(cb->skb).portid,
521 afi->family, table) < 0)
524 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
535 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
536 struct sk_buff *skb, const struct nlmsghdr *nlh,
537 const struct nlattr * const nla[])
539 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
540 u8 genmask = nft_genmask_cur(net);
541 const struct nft_af_info *afi;
542 const struct nft_table *table;
543 struct sk_buff *skb2;
544 int family = nfmsg->nfgen_family;
547 if (nlh->nlmsg_flags & NLM_F_DUMP) {
548 struct netlink_dump_control c = {
549 .dump = nf_tables_dump_tables,
551 return netlink_dump_start(nlsk, skb, nlh, &c);
554 afi = nf_tables_afinfo_lookup(net, family, false);
558 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
560 return PTR_ERR(table);
562 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
566 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
567 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
572 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
579 static void _nf_tables_table_disable(struct net *net,
580 const struct nft_af_info *afi,
581 struct nft_table *table,
584 struct nft_chain *chain;
587 list_for_each_entry(chain, &table->chains, list) {
588 if (!nft_is_active_next(net, chain))
590 if (!(chain->flags & NFT_BASE_CHAIN))
593 if (cnt && i++ == cnt)
596 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
601 static int nf_tables_table_enable(struct net *net,
602 const struct nft_af_info *afi,
603 struct nft_table *table)
605 struct nft_chain *chain;
608 list_for_each_entry(chain, &table->chains, list) {
609 if (!nft_is_active_next(net, chain))
611 if (!(chain->flags & NFT_BASE_CHAIN))
614 err = nf_register_net_hooks(net, nft_base_chain(chain)->ops,
624 _nf_tables_table_disable(net, afi, table, i);
628 static void nf_tables_table_disable(struct net *net,
629 const struct nft_af_info *afi,
630 struct nft_table *table)
632 _nf_tables_table_disable(net, afi, table, 0);
635 static int nf_tables_updtable(struct nft_ctx *ctx)
637 struct nft_trans *trans;
641 if (!ctx->nla[NFTA_TABLE_FLAGS])
644 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
645 if (flags & ~NFT_TABLE_F_DORMANT)
648 if (flags == ctx->table->flags)
651 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
652 sizeof(struct nft_trans_table));
656 if ((flags & NFT_TABLE_F_DORMANT) &&
657 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
658 nft_trans_table_enable(trans) = false;
659 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
660 ctx->table->flags & NFT_TABLE_F_DORMANT) {
661 ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table);
663 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
664 nft_trans_table_enable(trans) = true;
670 nft_trans_table_update(trans) = true;
671 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
674 nft_trans_destroy(trans);
678 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
679 struct sk_buff *skb, const struct nlmsghdr *nlh,
680 const struct nlattr * const nla[])
682 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
683 u8 genmask = nft_genmask_next(net);
684 const struct nlattr *name;
685 struct nft_af_info *afi;
686 struct nft_table *table;
687 int family = nfmsg->nfgen_family;
692 afi = nf_tables_afinfo_lookup(net, family, true);
696 name = nla[NFTA_TABLE_NAME];
697 table = nf_tables_table_lookup(afi, name, genmask);
699 if (PTR_ERR(table) != -ENOENT)
700 return PTR_ERR(table);
702 if (nlh->nlmsg_flags & NLM_F_EXCL)
704 if (nlh->nlmsg_flags & NLM_F_REPLACE)
707 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
708 return nf_tables_updtable(&ctx);
711 if (nla[NFTA_TABLE_FLAGS]) {
712 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
713 if (flags & ~NFT_TABLE_F_DORMANT)
718 if (!try_module_get(afi->owner))
722 table = kzalloc(sizeof(*table), GFP_KERNEL);
726 nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
727 INIT_LIST_HEAD(&table->chains);
728 INIT_LIST_HEAD(&table->sets);
729 INIT_LIST_HEAD(&table->objects);
730 table->flags = flags;
732 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
733 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
737 list_add_tail_rcu(&table->list, &afi->tables);
742 module_put(afi->owner);
747 static int nft_flush_table(struct nft_ctx *ctx)
750 struct nft_chain *chain, *nc;
751 struct nft_object *obj, *ne;
752 struct nft_set *set, *ns;
754 list_for_each_entry(chain, &ctx->table->chains, list) {
755 if (!nft_is_active_next(ctx->net, chain))
760 err = nft_delrule_by_chain(ctx);
765 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
766 if (!nft_is_active_next(ctx->net, set))
769 if (set->flags & NFT_SET_ANONYMOUS &&
770 !list_empty(&set->bindings))
773 err = nft_delset(ctx, set);
778 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
779 err = nft_delobj(ctx, obj);
784 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
785 if (!nft_is_active_next(ctx->net, chain))
790 err = nft_delchain(ctx);
795 err = nft_deltable(ctx);
800 static int nft_flush(struct nft_ctx *ctx, int family)
802 struct nft_af_info *afi;
803 struct nft_table *table, *nt;
804 const struct nlattr * const *nla = ctx->nla;
807 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
808 if (family != AF_UNSPEC && afi->family != family)
812 list_for_each_entry_safe(table, nt, &afi->tables, list) {
813 if (!nft_is_active_next(ctx->net, table))
816 if (nla[NFTA_TABLE_NAME] &&
817 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
822 err = nft_flush_table(ctx);
831 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
832 struct sk_buff *skb, const struct nlmsghdr *nlh,
833 const struct nlattr * const nla[])
835 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
836 u8 genmask = nft_genmask_next(net);
837 struct nft_af_info *afi;
838 struct nft_table *table;
839 int family = nfmsg->nfgen_family;
842 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
843 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
844 return nft_flush(&ctx, family);
846 afi = nf_tables_afinfo_lookup(net, family, false);
850 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
852 return PTR_ERR(table);
857 return nft_flush_table(&ctx);
860 static void nf_tables_table_destroy(struct nft_ctx *ctx)
862 BUG_ON(ctx->table->use > 0);
865 module_put(ctx->afi->owner);
868 int nft_register_chain_type(const struct nf_chain_type *ctype)
872 nfnl_lock(NFNL_SUBSYS_NFTABLES);
873 if (chain_type[ctype->family][ctype->type] != NULL) {
877 chain_type[ctype->family][ctype->type] = ctype;
879 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
882 EXPORT_SYMBOL_GPL(nft_register_chain_type);
884 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
886 nfnl_lock(NFNL_SUBSYS_NFTABLES);
887 chain_type[ctype->family][ctype->type] = NULL;
888 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
890 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
896 static struct nft_chain *
897 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle,
900 struct nft_chain *chain;
902 list_for_each_entry(chain, &table->chains, list) {
903 if (chain->handle == handle &&
904 nft_active_genmask(chain, genmask))
908 return ERR_PTR(-ENOENT);
911 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
912 const struct nlattr *nla,
915 struct nft_chain *chain;
918 return ERR_PTR(-EINVAL);
920 list_for_each_entry(chain, &table->chains, list) {
921 if (!nla_strcmp(nla, chain->name) &&
922 nft_active_genmask(chain, genmask))
926 return ERR_PTR(-ENOENT);
929 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
930 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
931 .len = NFT_TABLE_MAXNAMELEN - 1 },
932 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
933 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
934 .len = NFT_CHAIN_MAXNAMELEN - 1 },
935 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
936 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
937 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
938 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
941 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
942 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
943 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
944 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
945 .len = IFNAMSIZ - 1 },
948 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
950 struct nft_stats *cpu_stats, total;
956 memset(&total, 0, sizeof(total));
957 for_each_possible_cpu(cpu) {
958 cpu_stats = per_cpu_ptr(stats, cpu);
960 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
961 pkts = cpu_stats->pkts;
962 bytes = cpu_stats->bytes;
963 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
965 total.bytes += bytes;
967 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
969 goto nla_put_failure;
971 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
973 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
975 goto nla_put_failure;
977 nla_nest_end(skb, nest);
984 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
985 u32 portid, u32 seq, int event, u32 flags,
986 int family, const struct nft_table *table,
987 const struct nft_chain *chain)
989 struct nlmsghdr *nlh;
990 struct nfgenmsg *nfmsg;
992 event |= NFNL_SUBSYS_NFTABLES << 8;
993 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
995 goto nla_put_failure;
997 nfmsg = nlmsg_data(nlh);
998 nfmsg->nfgen_family = family;
999 nfmsg->version = NFNETLINK_V0;
1000 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1002 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1003 goto nla_put_failure;
1004 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1006 goto nla_put_failure;
1007 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1008 goto nla_put_failure;
1010 if (chain->flags & NFT_BASE_CHAIN) {
1011 const struct nft_base_chain *basechain = nft_base_chain(chain);
1012 const struct nf_hook_ops *ops = &basechain->ops[0];
1013 struct nlattr *nest;
1015 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
1017 goto nla_put_failure;
1018 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1019 goto nla_put_failure;
1020 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1021 goto nla_put_failure;
1022 if (basechain->dev_name[0] &&
1023 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1024 goto nla_put_failure;
1025 nla_nest_end(skb, nest);
1027 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1028 htonl(basechain->policy)))
1029 goto nla_put_failure;
1031 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1032 goto nla_put_failure;
1034 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
1035 goto nla_put_failure;
1038 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1039 goto nla_put_failure;
1041 nlmsg_end(skb, nlh);
1045 nlmsg_trim(skb, nlh);
1049 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1051 struct sk_buff *skb;
1055 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1058 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1062 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1063 event, 0, ctx->afi->family, ctx->table,
1070 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1071 ctx->report, GFP_KERNEL);
1074 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1077 static int nf_tables_dump_chains(struct sk_buff *skb,
1078 struct netlink_callback *cb)
1080 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1081 const struct nft_af_info *afi;
1082 const struct nft_table *table;
1083 const struct nft_chain *chain;
1084 unsigned int idx = 0, s_idx = cb->args[0];
1085 struct net *net = sock_net(skb->sk);
1086 int family = nfmsg->nfgen_family;
1089 cb->seq = net->nft.base_seq;
1091 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1092 if (family != NFPROTO_UNSPEC && family != afi->family)
1095 list_for_each_entry_rcu(table, &afi->tables, list) {
1096 list_for_each_entry_rcu(chain, &table->chains, list) {
1100 memset(&cb->args[1], 0,
1101 sizeof(cb->args) - sizeof(cb->args[0]));
1102 if (!nft_is_active(net, chain))
1104 if (nf_tables_fill_chain_info(skb, net,
1105 NETLINK_CB(cb->skb).portid,
1109 afi->family, table, chain) < 0)
1112 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1124 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1125 struct sk_buff *skb, const struct nlmsghdr *nlh,
1126 const struct nlattr * const nla[])
1128 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1129 u8 genmask = nft_genmask_cur(net);
1130 const struct nft_af_info *afi;
1131 const struct nft_table *table;
1132 const struct nft_chain *chain;
1133 struct sk_buff *skb2;
1134 int family = nfmsg->nfgen_family;
1137 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1138 struct netlink_dump_control c = {
1139 .dump = nf_tables_dump_chains,
1141 return netlink_dump_start(nlsk, skb, nlh, &c);
1144 afi = nf_tables_afinfo_lookup(net, family, false);
1146 return PTR_ERR(afi);
1148 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1150 return PTR_ERR(table);
1152 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1154 return PTR_ERR(chain);
1156 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1160 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1161 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1162 family, table, chain);
1166 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1173 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1174 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1175 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1178 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1180 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1181 struct nft_stats __percpu *newstats;
1182 struct nft_stats *stats;
1185 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1187 return ERR_PTR(err);
1189 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1190 return ERR_PTR(-EINVAL);
1192 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1193 if (newstats == NULL)
1194 return ERR_PTR(-ENOMEM);
1196 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1197 * are not exposed to userspace.
1200 stats = this_cpu_ptr(newstats);
1201 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1202 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1208 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1209 struct nft_stats __percpu *newstats)
1211 if (newstats == NULL)
1215 struct nft_stats __percpu *oldstats =
1216 nft_dereference(chain->stats);
1218 rcu_assign_pointer(chain->stats, newstats);
1220 free_percpu(oldstats);
1222 rcu_assign_pointer(chain->stats, newstats);
1225 static void nf_tables_chain_destroy(struct nft_chain *chain)
1227 BUG_ON(chain->use > 0);
1229 if (chain->flags & NFT_BASE_CHAIN) {
1230 struct nft_base_chain *basechain = nft_base_chain(chain);
1232 module_put(basechain->type->owner);
1233 free_percpu(basechain->stats);
1234 if (basechain->ops[0].dev != NULL)
1235 dev_put(basechain->ops[0].dev);
1242 struct nft_chain_hook {
1245 const struct nf_chain_type *type;
1246 struct net_device *dev;
1249 static int nft_chain_parse_hook(struct net *net,
1250 const struct nlattr * const nla[],
1251 struct nft_af_info *afi,
1252 struct nft_chain_hook *hook, bool create)
1254 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1255 const struct nf_chain_type *type;
1256 struct net_device *dev;
1259 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1264 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1265 ha[NFTA_HOOK_PRIORITY] == NULL)
1268 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1269 if (hook->num >= afi->nhooks)
1272 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1274 type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT];
1275 if (nla[NFTA_CHAIN_TYPE]) {
1276 type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE],
1279 return PTR_ERR(type);
1281 if (!(type->hook_mask & (1 << hook->num)))
1283 if (!try_module_get(type->owner))
1289 if (afi->flags & NFT_AF_NEEDS_DEV) {
1290 char ifname[IFNAMSIZ];
1292 if (!ha[NFTA_HOOK_DEV]) {
1293 module_put(type->owner);
1297 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1298 dev = dev_get_by_name(net, ifname);
1300 module_put(type->owner);
1304 } else if (ha[NFTA_HOOK_DEV]) {
1305 module_put(type->owner);
1312 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1314 module_put(hook->type->owner);
1315 if (hook->dev != NULL)
1319 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1320 struct sk_buff *skb, const struct nlmsghdr *nlh,
1321 const struct nlattr * const nla[])
1323 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1324 const struct nlattr * uninitialized_var(name);
1325 struct nft_af_info *afi;
1326 struct nft_table *table;
1327 struct nft_chain *chain;
1328 struct nft_base_chain *basechain = NULL;
1329 u8 genmask = nft_genmask_next(net);
1330 int family = nfmsg->nfgen_family;
1331 u8 policy = NF_ACCEPT;
1334 struct nft_stats __percpu *stats;
1339 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1341 afi = nf_tables_afinfo_lookup(net, family, true);
1343 return PTR_ERR(afi);
1345 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1347 return PTR_ERR(table);
1350 name = nla[NFTA_CHAIN_NAME];
1352 if (nla[NFTA_CHAIN_HANDLE]) {
1353 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1354 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
1356 return PTR_ERR(chain);
1358 chain = nf_tables_chain_lookup(table, name, genmask);
1359 if (IS_ERR(chain)) {
1360 if (PTR_ERR(chain) != -ENOENT)
1361 return PTR_ERR(chain);
1366 if (nla[NFTA_CHAIN_POLICY]) {
1367 if ((chain != NULL &&
1368 !(chain->flags & NFT_BASE_CHAIN)))
1371 if (chain == NULL &&
1372 nla[NFTA_CHAIN_HOOK] == NULL)
1375 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1385 if (chain != NULL) {
1386 struct nft_stats *stats = NULL;
1387 struct nft_trans *trans;
1389 if (nlh->nlmsg_flags & NLM_F_EXCL)
1391 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1394 if (nla[NFTA_CHAIN_HOOK]) {
1395 struct nft_base_chain *basechain;
1396 struct nft_chain_hook hook;
1397 struct nf_hook_ops *ops;
1399 if (!(chain->flags & NFT_BASE_CHAIN))
1402 err = nft_chain_parse_hook(net, nla, afi, &hook,
1407 basechain = nft_base_chain(chain);
1408 if (basechain->type != hook.type) {
1409 nft_chain_release_hook(&hook);
1413 for (i = 0; i < afi->nops; i++) {
1414 ops = &basechain->ops[i];
1415 if (ops->hooknum != hook.num ||
1416 ops->priority != hook.priority ||
1417 ops->dev != hook.dev) {
1418 nft_chain_release_hook(&hook);
1422 nft_chain_release_hook(&hook);
1425 if (nla[NFTA_CHAIN_HANDLE] && name) {
1426 struct nft_chain *chain2;
1428 chain2 = nf_tables_chain_lookup(table,
1429 nla[NFTA_CHAIN_NAME],
1432 return PTR_ERR(chain2);
1435 if (nla[NFTA_CHAIN_COUNTERS]) {
1436 if (!(chain->flags & NFT_BASE_CHAIN))
1439 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1441 return PTR_ERR(stats);
1444 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1445 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1446 sizeof(struct nft_trans_chain));
1447 if (trans == NULL) {
1452 nft_trans_chain_stats(trans) = stats;
1453 nft_trans_chain_update(trans) = true;
1455 if (nla[NFTA_CHAIN_POLICY])
1456 nft_trans_chain_policy(trans) = policy;
1458 nft_trans_chain_policy(trans) = -1;
1460 if (nla[NFTA_CHAIN_HANDLE] && name) {
1461 nla_strlcpy(nft_trans_chain_name(trans), name,
1462 NFT_CHAIN_MAXNAMELEN);
1464 list_add_tail(&trans->list, &net->nft.commit_list);
1468 if (table->use == UINT_MAX)
1471 if (nla[NFTA_CHAIN_HOOK]) {
1472 struct nft_chain_hook hook;
1473 struct nf_hook_ops *ops;
1476 err = nft_chain_parse_hook(net, nla, afi, &hook, create);
1480 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1481 if (basechain == NULL) {
1482 nft_chain_release_hook(&hook);
1486 if (hook.dev != NULL)
1487 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1489 if (nla[NFTA_CHAIN_COUNTERS]) {
1490 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1491 if (IS_ERR(stats)) {
1492 nft_chain_release_hook(&hook);
1494 return PTR_ERR(stats);
1496 basechain->stats = stats;
1498 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1499 if (stats == NULL) {
1500 nft_chain_release_hook(&hook);
1504 rcu_assign_pointer(basechain->stats, stats);
1507 hookfn = hook.type->hooks[hook.num];
1508 basechain->type = hook.type;
1509 chain = &basechain->chain;
1511 for (i = 0; i < afi->nops; i++) {
1512 ops = &basechain->ops[i];
1514 ops->hooknum = hook.num;
1515 ops->priority = hook.priority;
1517 ops->hook = afi->hooks[ops->hooknum];
1518 ops->dev = hook.dev;
1521 if (afi->hook_ops_init)
1522 afi->hook_ops_init(ops, i);
1525 chain->flags |= NFT_BASE_CHAIN;
1526 basechain->policy = policy;
1528 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1533 INIT_LIST_HEAD(&chain->rules);
1534 chain->handle = nf_tables_alloc_handle(table);
1535 chain->table = table;
1536 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1538 err = nf_tables_register_hooks(net, table, chain, afi->nops);
1542 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1543 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1548 list_add_tail_rcu(&chain->list, &table->chains);
1551 nf_tables_unregister_hooks(net, table, chain, afi->nops);
1553 nf_tables_chain_destroy(chain);
1557 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1558 struct sk_buff *skb, const struct nlmsghdr *nlh,
1559 const struct nlattr * const nla[])
1561 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1562 u8 genmask = nft_genmask_next(net);
1563 struct nft_af_info *afi;
1564 struct nft_table *table;
1565 struct nft_chain *chain;
1566 int family = nfmsg->nfgen_family;
1569 afi = nf_tables_afinfo_lookup(net, family, false);
1571 return PTR_ERR(afi);
1573 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1575 return PTR_ERR(table);
1577 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1579 return PTR_ERR(chain);
1583 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1585 return nft_delchain(&ctx);
1593 * nft_register_expr - register nf_tables expr type
1596 * Registers the expr type for use with nf_tables. Returns zero on
1597 * success or a negative errno code otherwise.
1599 int nft_register_expr(struct nft_expr_type *type)
1601 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1602 if (type->family == NFPROTO_UNSPEC)
1603 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1605 list_add_rcu(&type->list, &nf_tables_expressions);
1606 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1609 EXPORT_SYMBOL_GPL(nft_register_expr);
1612 * nft_unregister_expr - unregister nf_tables expr type
1615 * Unregisters the expr typefor use with nf_tables.
1617 void nft_unregister_expr(struct nft_expr_type *type)
1619 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1620 list_del_rcu(&type->list);
1621 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1623 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1625 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1628 const struct nft_expr_type *type;
1630 list_for_each_entry(type, &nf_tables_expressions, list) {
1631 if (!nla_strcmp(nla, type->name) &&
1632 (!type->family || type->family == family))
1638 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1641 const struct nft_expr_type *type;
1644 return ERR_PTR(-EINVAL);
1646 type = __nft_expr_type_get(family, nla);
1647 if (type != NULL && try_module_get(type->owner))
1650 #ifdef CONFIG_MODULES
1652 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1653 request_module("nft-expr-%u-%.*s", family,
1654 nla_len(nla), (char *)nla_data(nla));
1655 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1656 if (__nft_expr_type_get(family, nla))
1657 return ERR_PTR(-EAGAIN);
1659 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1660 request_module("nft-expr-%.*s",
1661 nla_len(nla), (char *)nla_data(nla));
1662 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1663 if (__nft_expr_type_get(family, nla))
1664 return ERR_PTR(-EAGAIN);
1667 return ERR_PTR(-ENOENT);
1670 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1671 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1672 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1675 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1676 const struct nft_expr *expr)
1678 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1679 goto nla_put_failure;
1681 if (expr->ops->dump) {
1682 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1684 goto nla_put_failure;
1685 if (expr->ops->dump(skb, expr) < 0)
1686 goto nla_put_failure;
1687 nla_nest_end(skb, data);
1696 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1697 const struct nft_expr *expr)
1699 struct nlattr *nest;
1701 nest = nla_nest_start(skb, attr);
1703 goto nla_put_failure;
1704 if (nf_tables_fill_expr_info(skb, expr) < 0)
1705 goto nla_put_failure;
1706 nla_nest_end(skb, nest);
1713 struct nft_expr_info {
1714 const struct nft_expr_ops *ops;
1715 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1718 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1719 const struct nlattr *nla,
1720 struct nft_expr_info *info)
1722 const struct nft_expr_type *type;
1723 const struct nft_expr_ops *ops;
1724 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1727 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1731 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1733 return PTR_ERR(type);
1735 if (tb[NFTA_EXPR_DATA]) {
1736 err = nla_parse_nested(info->tb, type->maxattr,
1737 tb[NFTA_EXPR_DATA], type->policy);
1741 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1743 if (type->select_ops != NULL) {
1744 ops = type->select_ops(ctx,
1745 (const struct nlattr * const *)info->tb);
1757 module_put(type->owner);
1761 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1762 const struct nft_expr_info *info,
1763 struct nft_expr *expr)
1765 const struct nft_expr_ops *ops = info->ops;
1770 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1782 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1783 struct nft_expr *expr)
1785 if (expr->ops->destroy)
1786 expr->ops->destroy(ctx, expr);
1787 module_put(expr->ops->type->owner);
1790 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1791 const struct nlattr *nla)
1793 struct nft_expr_info info;
1794 struct nft_expr *expr;
1797 err = nf_tables_expr_parse(ctx, nla, &info);
1802 expr = kzalloc(info.ops->size, GFP_KERNEL);
1806 err = nf_tables_newexpr(ctx, &info, expr);
1814 module_put(info.ops->type->owner);
1816 return ERR_PTR(err);
1819 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1821 nf_tables_expr_destroy(ctx, expr);
1829 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1832 struct nft_rule *rule;
1834 // FIXME: this sucks
1835 list_for_each_entry(rule, &chain->rules, list) {
1836 if (handle == rule->handle)
1840 return ERR_PTR(-ENOENT);
1843 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1844 const struct nlattr *nla)
1847 return ERR_PTR(-EINVAL);
1849 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1852 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1853 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
1854 .len = NFT_TABLE_MAXNAMELEN - 1 },
1855 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1856 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1857 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1858 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1859 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1860 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1861 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1862 .len = NFT_USERDATA_MAXLEN },
1865 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1866 u32 portid, u32 seq, int event,
1867 u32 flags, int family,
1868 const struct nft_table *table,
1869 const struct nft_chain *chain,
1870 const struct nft_rule *rule)
1872 struct nlmsghdr *nlh;
1873 struct nfgenmsg *nfmsg;
1874 const struct nft_expr *expr, *next;
1875 struct nlattr *list;
1876 const struct nft_rule *prule;
1877 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1879 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1882 goto nla_put_failure;
1884 nfmsg = nlmsg_data(nlh);
1885 nfmsg->nfgen_family = family;
1886 nfmsg->version = NFNETLINK_V0;
1887 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1889 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1890 goto nla_put_failure;
1891 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1892 goto nla_put_failure;
1893 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1895 goto nla_put_failure;
1897 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1898 prule = list_entry(rule->list.prev, struct nft_rule, list);
1899 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1900 cpu_to_be64(prule->handle),
1902 goto nla_put_failure;
1905 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1907 goto nla_put_failure;
1908 nft_rule_for_each_expr(expr, next, rule) {
1909 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
1910 goto nla_put_failure;
1912 nla_nest_end(skb, list);
1915 struct nft_userdata *udata = nft_userdata(rule);
1916 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1918 goto nla_put_failure;
1921 nlmsg_end(skb, nlh);
1925 nlmsg_trim(skb, nlh);
1929 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
1930 const struct nft_rule *rule, int event)
1932 struct sk_buff *skb;
1936 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1939 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1943 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1944 event, 0, ctx->afi->family, ctx->table,
1951 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1952 ctx->report, GFP_KERNEL);
1955 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1958 struct nft_rule_dump_ctx {
1959 char table[NFT_TABLE_MAXNAMELEN];
1960 char chain[NFT_CHAIN_MAXNAMELEN];
1963 static int nf_tables_dump_rules(struct sk_buff *skb,
1964 struct netlink_callback *cb)
1966 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1967 const struct nft_rule_dump_ctx *ctx = cb->data;
1968 const struct nft_af_info *afi;
1969 const struct nft_table *table;
1970 const struct nft_chain *chain;
1971 const struct nft_rule *rule;
1972 unsigned int idx = 0, s_idx = cb->args[0];
1973 struct net *net = sock_net(skb->sk);
1974 int family = nfmsg->nfgen_family;
1977 cb->seq = net->nft.base_seq;
1979 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1980 if (family != NFPROTO_UNSPEC && family != afi->family)
1983 list_for_each_entry_rcu(table, &afi->tables, list) {
1984 if (ctx && ctx->table[0] &&
1985 strcmp(ctx->table, table->name) != 0)
1988 list_for_each_entry_rcu(chain, &table->chains, list) {
1989 if (ctx && ctx->chain[0] &&
1990 strcmp(ctx->chain, chain->name) != 0)
1993 list_for_each_entry_rcu(rule, &chain->rules, list) {
1994 if (!nft_is_active(net, rule))
1999 memset(&cb->args[1], 0,
2000 sizeof(cb->args) - sizeof(cb->args[0]));
2001 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2004 NLM_F_MULTI | NLM_F_APPEND,
2005 afi->family, table, chain, rule) < 0)
2008 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2022 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2028 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2029 struct sk_buff *skb, const struct nlmsghdr *nlh,
2030 const struct nlattr * const nla[])
2032 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2033 u8 genmask = nft_genmask_cur(net);
2034 const struct nft_af_info *afi;
2035 const struct nft_table *table;
2036 const struct nft_chain *chain;
2037 const struct nft_rule *rule;
2038 struct sk_buff *skb2;
2039 int family = nfmsg->nfgen_family;
2042 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2043 struct netlink_dump_control c = {
2044 .dump = nf_tables_dump_rules,
2045 .done = nf_tables_dump_rules_done,
2048 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2049 struct nft_rule_dump_ctx *ctx;
2051 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
2055 if (nla[NFTA_RULE_TABLE])
2056 nla_strlcpy(ctx->table, nla[NFTA_RULE_TABLE],
2057 sizeof(ctx->table));
2058 if (nla[NFTA_RULE_CHAIN])
2059 nla_strlcpy(ctx->chain, nla[NFTA_RULE_CHAIN],
2060 sizeof(ctx->chain));
2064 return netlink_dump_start(nlsk, skb, nlh, &c);
2067 afi = nf_tables_afinfo_lookup(net, family, false);
2069 return PTR_ERR(afi);
2071 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2073 return PTR_ERR(table);
2075 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2077 return PTR_ERR(chain);
2079 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2081 return PTR_ERR(rule);
2083 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2087 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2088 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2089 family, table, chain, rule);
2093 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2100 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2101 struct nft_rule *rule)
2103 struct nft_expr *expr;
2106 * Careful: some expressions might not be initialized in case this
2107 * is called on error from nf_tables_newrule().
2109 expr = nft_expr_first(rule);
2110 while (expr != nft_expr_last(rule) && expr->ops) {
2111 nf_tables_expr_destroy(ctx, expr);
2112 expr = nft_expr_next(expr);
2117 #define NFT_RULE_MAXEXPRS 128
2119 static struct nft_expr_info *info;
2121 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2122 struct sk_buff *skb, const struct nlmsghdr *nlh,
2123 const struct nlattr * const nla[])
2125 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2126 u8 genmask = nft_genmask_next(net);
2127 struct nft_af_info *afi;
2128 struct nft_table *table;
2129 struct nft_chain *chain;
2130 struct nft_rule *rule, *old_rule = NULL;
2131 struct nft_userdata *udata;
2132 struct nft_trans *trans = NULL;
2133 struct nft_expr *expr;
2136 unsigned int size, i, n, ulen = 0, usize = 0;
2139 u64 handle, pos_handle;
2141 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2143 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2145 return PTR_ERR(afi);
2147 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2149 return PTR_ERR(table);
2151 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2153 return PTR_ERR(chain);
2155 if (nla[NFTA_RULE_HANDLE]) {
2156 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2157 rule = __nf_tables_rule_lookup(chain, handle);
2159 return PTR_ERR(rule);
2161 if (nlh->nlmsg_flags & NLM_F_EXCL)
2163 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2168 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2170 handle = nf_tables_alloc_handle(table);
2172 if (chain->use == UINT_MAX)
2176 if (nla[NFTA_RULE_POSITION]) {
2177 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2180 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2181 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2182 if (IS_ERR(old_rule))
2183 return PTR_ERR(old_rule);
2186 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2190 if (nla[NFTA_RULE_EXPRESSIONS]) {
2191 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2193 if (nla_type(tmp) != NFTA_LIST_ELEM)
2195 if (n == NFT_RULE_MAXEXPRS)
2197 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2200 size += info[n].ops->size;
2204 /* Check for overflow of dlen field */
2206 if (size >= 1 << 12)
2209 if (nla[NFTA_RULE_USERDATA]) {
2210 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2212 usize = sizeof(struct nft_userdata) + ulen;
2216 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2220 nft_activate_next(net, rule);
2222 rule->handle = handle;
2224 rule->udata = ulen ? 1 : 0;
2227 udata = nft_userdata(rule);
2228 udata->len = ulen - 1;
2229 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2232 expr = nft_expr_first(rule);
2233 for (i = 0; i < n; i++) {
2234 err = nf_tables_newexpr(&ctx, &info[i], expr);
2238 expr = nft_expr_next(expr);
2241 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2242 if (nft_is_active_next(net, old_rule)) {
2243 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2245 if (trans == NULL) {
2249 nft_deactivate_next(net, old_rule);
2251 list_add_tail_rcu(&rule->list, &old_rule->list);
2256 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2258 list_add_rcu(&rule->list, &old_rule->list);
2260 list_add_tail_rcu(&rule->list, &chain->rules);
2263 list_add_tail_rcu(&rule->list, &old_rule->list);
2265 list_add_rcu(&rule->list, &chain->rules);
2268 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2276 list_del_rcu(&rule->list);
2278 nf_tables_rule_destroy(&ctx, rule);
2280 for (i = 0; i < n; i++) {
2281 if (info[i].ops != NULL)
2282 module_put(info[i].ops->type->owner);
2287 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2288 const struct nlattr *nla)
2290 u32 id = ntohl(nla_get_be32(nla));
2291 struct nft_trans *trans;
2293 list_for_each_entry(trans, &net->nft.commit_list, list) {
2294 struct nft_rule *rule = nft_trans_rule(trans);
2296 if (trans->msg_type == NFT_MSG_NEWRULE &&
2297 id == nft_trans_rule_id(trans))
2300 return ERR_PTR(-ENOENT);
2303 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2304 struct sk_buff *skb, const struct nlmsghdr *nlh,
2305 const struct nlattr * const nla[])
2307 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2308 u8 genmask = nft_genmask_next(net);
2309 struct nft_af_info *afi;
2310 struct nft_table *table;
2311 struct nft_chain *chain = NULL;
2312 struct nft_rule *rule;
2313 int family = nfmsg->nfgen_family, err = 0;
2316 afi = nf_tables_afinfo_lookup(net, family, false);
2318 return PTR_ERR(afi);
2320 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2322 return PTR_ERR(table);
2324 if (nla[NFTA_RULE_CHAIN]) {
2325 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2328 return PTR_ERR(chain);
2331 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2334 if (nla[NFTA_RULE_HANDLE]) {
2335 rule = nf_tables_rule_lookup(chain,
2336 nla[NFTA_RULE_HANDLE]);
2338 return PTR_ERR(rule);
2340 err = nft_delrule(&ctx, rule);
2341 } else if (nla[NFTA_RULE_ID]) {
2342 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2344 return PTR_ERR(rule);
2346 err = nft_delrule(&ctx, rule);
2348 err = nft_delrule_by_chain(&ctx);
2351 list_for_each_entry(chain, &table->chains, list) {
2352 if (!nft_is_active_next(net, chain))
2356 err = nft_delrule_by_chain(&ctx);
2369 static LIST_HEAD(nf_tables_set_ops);
2371 int nft_register_set(struct nft_set_ops *ops)
2373 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2374 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2375 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2378 EXPORT_SYMBOL_GPL(nft_register_set);
2380 void nft_unregister_set(struct nft_set_ops *ops)
2382 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2383 list_del_rcu(&ops->list);
2384 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2386 EXPORT_SYMBOL_GPL(nft_unregister_set);
2389 * Select a set implementation based on the data characteristics and the
2390 * given policy. The total memory use might not be known if no size is
2391 * given, in that case the amount of memory per element is used.
2393 static const struct nft_set_ops *
2394 nft_select_set_ops(const struct nlattr * const nla[],
2395 const struct nft_set_desc *desc,
2396 enum nft_set_policies policy)
2398 const struct nft_set_ops *ops, *bops;
2399 struct nft_set_estimate est, best;
2402 #ifdef CONFIG_MODULES
2403 if (list_empty(&nf_tables_set_ops)) {
2404 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2405 request_module("nft-set");
2406 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2407 if (!list_empty(&nf_tables_set_ops))
2408 return ERR_PTR(-EAGAIN);
2412 if (nla[NFTA_SET_FLAGS] != NULL) {
2413 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2414 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT |
2423 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2424 if ((ops->features & features) != features)
2426 if (!ops->estimate(desc, features, &est))
2430 case NFT_SET_POL_PERFORMANCE:
2431 if (est.lookup < best.lookup)
2433 if (est.lookup == best.lookup) {
2435 if (est.space < best.space)
2437 } else if (est.size < best.size) {
2442 case NFT_SET_POL_MEMORY:
2444 if (est.space < best.space)
2446 if (est.space == best.space &&
2447 est.lookup < best.lookup)
2449 } else if (est.size < best.size) {
2457 if (!try_module_get(ops->owner))
2460 module_put(bops->owner);
2469 return ERR_PTR(-EOPNOTSUPP);
2472 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2473 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2474 .len = NFT_TABLE_MAXNAMELEN - 1 },
2475 [NFTA_SET_NAME] = { .type = NLA_STRING,
2476 .len = NFT_SET_MAXNAMELEN - 1 },
2477 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2478 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2479 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2480 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2481 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2482 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2483 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2484 [NFTA_SET_ID] = { .type = NLA_U32 },
2485 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2486 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2487 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2488 .len = NFT_USERDATA_MAXLEN },
2489 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
2492 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2493 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2496 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2497 const struct sk_buff *skb,
2498 const struct nlmsghdr *nlh,
2499 const struct nlattr * const nla[],
2502 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2503 struct nft_af_info *afi = NULL;
2504 struct nft_table *table = NULL;
2506 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2507 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2509 return PTR_ERR(afi);
2512 if (nla[NFTA_SET_TABLE] != NULL) {
2514 return -EAFNOSUPPORT;
2516 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2519 return PTR_ERR(table);
2522 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
2526 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2527 const struct nlattr *nla, u8 genmask)
2529 struct nft_set *set;
2532 return ERR_PTR(-EINVAL);
2534 list_for_each_entry(set, &table->sets, list) {
2535 if (!nla_strcmp(nla, set->name) &&
2536 nft_active_genmask(set, genmask))
2539 return ERR_PTR(-ENOENT);
2541 EXPORT_SYMBOL_GPL(nf_tables_set_lookup);
2543 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2544 const struct nlattr *nla,
2547 struct nft_trans *trans;
2548 u32 id = ntohl(nla_get_be32(nla));
2550 list_for_each_entry(trans, &net->nft.commit_list, list) {
2551 struct nft_set *set = nft_trans_set(trans);
2553 if (trans->msg_type == NFT_MSG_NEWSET &&
2554 id == nft_trans_set_id(trans) &&
2555 nft_active_genmask(set, genmask))
2558 return ERR_PTR(-ENOENT);
2560 EXPORT_SYMBOL_GPL(nf_tables_set_lookup_byid);
2562 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2565 const struct nft_set *i;
2567 unsigned long *inuse;
2568 unsigned int n = 0, min = 0;
2570 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
2572 if (p[1] != 'd' || strchr(p + 2, '%'))
2575 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2579 list_for_each_entry(i, &ctx->table->sets, list) {
2582 if (!nft_is_active_next(ctx->net, set))
2584 if (!sscanf(i->name, name, &tmp))
2586 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2589 set_bit(tmp - min, inuse);
2592 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2593 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2594 min += BITS_PER_BYTE * PAGE_SIZE;
2595 memset(inuse, 0, PAGE_SIZE);
2598 free_page((unsigned long)inuse);
2601 snprintf(set->name, sizeof(set->name), name, min + n);
2602 list_for_each_entry(i, &ctx->table->sets, list) {
2603 if (!nft_is_active_next(ctx->net, i))
2605 if (!strcmp(set->name, i->name))
2611 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2612 const struct nft_set *set, u16 event, u16 flags)
2614 struct nfgenmsg *nfmsg;
2615 struct nlmsghdr *nlh;
2616 struct nlattr *desc;
2617 u32 portid = ctx->portid;
2620 event |= NFNL_SUBSYS_NFTABLES << 8;
2621 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2624 goto nla_put_failure;
2626 nfmsg = nlmsg_data(nlh);
2627 nfmsg->nfgen_family = ctx->afi->family;
2628 nfmsg->version = NFNETLINK_V0;
2629 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2631 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2632 goto nla_put_failure;
2633 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2634 goto nla_put_failure;
2635 if (set->flags != 0)
2636 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2637 goto nla_put_failure;
2639 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2640 goto nla_put_failure;
2641 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2642 goto nla_put_failure;
2643 if (set->flags & NFT_SET_MAP) {
2644 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2645 goto nla_put_failure;
2646 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2647 goto nla_put_failure;
2649 if (set->flags & NFT_SET_OBJECT &&
2650 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
2651 goto nla_put_failure;
2654 nla_put_be64(skb, NFTA_SET_TIMEOUT,
2655 cpu_to_be64(jiffies_to_msecs(set->timeout)),
2657 goto nla_put_failure;
2659 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2660 goto nla_put_failure;
2662 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2663 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2664 goto nla_put_failure;
2667 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2668 goto nla_put_failure;
2670 desc = nla_nest_start(skb, NFTA_SET_DESC);
2672 goto nla_put_failure;
2674 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2675 goto nla_put_failure;
2676 nla_nest_end(skb, desc);
2678 nlmsg_end(skb, nlh);
2682 nlmsg_trim(skb, nlh);
2686 static void nf_tables_set_notify(const struct nft_ctx *ctx,
2687 const struct nft_set *set, int event,
2690 struct sk_buff *skb;
2691 u32 portid = ctx->portid;
2695 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2698 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2702 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2708 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
2712 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
2715 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2717 const struct nft_set *set;
2718 unsigned int idx, s_idx = cb->args[0];
2719 struct nft_af_info *afi;
2720 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2721 struct net *net = sock_net(skb->sk);
2722 int cur_family = cb->args[3];
2723 struct nft_ctx *ctx = cb->data, ctx_set;
2729 cb->seq = net->nft.base_seq;
2731 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2732 if (ctx->afi && ctx->afi != afi)
2736 if (afi->family != cur_family)
2741 list_for_each_entry_rcu(table, &afi->tables, list) {
2742 if (ctx->table && ctx->table != table)
2746 if (cur_table != table)
2752 list_for_each_entry_rcu(set, &table->sets, list) {
2755 if (!nft_is_active(net, set))
2759 ctx_set.table = table;
2761 if (nf_tables_fill_set(skb, &ctx_set, set,
2765 cb->args[2] = (unsigned long) table;
2766 cb->args[3] = afi->family;
2769 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2783 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2789 static int nf_tables_getset(struct net *net, struct sock *nlsk,
2790 struct sk_buff *skb, const struct nlmsghdr *nlh,
2791 const struct nlattr * const nla[])
2793 u8 genmask = nft_genmask_cur(net);
2794 const struct nft_set *set;
2796 struct sk_buff *skb2;
2797 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2800 /* Verify existence before starting dump */
2801 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
2805 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2806 struct netlink_dump_control c = {
2807 .dump = nf_tables_dump_sets,
2808 .done = nf_tables_dump_sets_done,
2810 struct nft_ctx *ctx_dump;
2812 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2813 if (ctx_dump == NULL)
2819 return netlink_dump_start(nlsk, skb, nlh, &c);
2822 /* Only accept unspec with dump */
2823 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2824 return -EAFNOSUPPORT;
2825 if (!nla[NFTA_SET_TABLE])
2828 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
2830 return PTR_ERR(set);
2832 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2836 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2840 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2847 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2848 struct nft_set_desc *desc,
2849 const struct nlattr *nla)
2851 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2854 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2858 if (da[NFTA_SET_DESC_SIZE] != NULL)
2859 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2864 static int nf_tables_newset(struct net *net, struct sock *nlsk,
2865 struct sk_buff *skb, const struct nlmsghdr *nlh,
2866 const struct nlattr * const nla[])
2868 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2869 u8 genmask = nft_genmask_next(net);
2870 const struct nft_set_ops *ops;
2871 struct nft_af_info *afi;
2872 struct nft_table *table;
2873 struct nft_set *set;
2875 char name[NFT_SET_MAXNAMELEN];
2879 u32 ktype, dtype, flags, policy, gc_int, objtype;
2880 struct nft_set_desc desc;
2881 unsigned char *udata;
2885 if (nla[NFTA_SET_TABLE] == NULL ||
2886 nla[NFTA_SET_NAME] == NULL ||
2887 nla[NFTA_SET_KEY_LEN] == NULL ||
2888 nla[NFTA_SET_ID] == NULL)
2891 memset(&desc, 0, sizeof(desc));
2893 ktype = NFT_DATA_VALUE;
2894 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2895 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2896 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2900 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2901 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
2905 if (nla[NFTA_SET_FLAGS] != NULL) {
2906 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2907 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2908 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2909 NFT_SET_MAP | NFT_SET_EVAL |
2912 /* Only one of these operations is supported */
2913 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
2914 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
2919 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2920 if (!(flags & NFT_SET_MAP))
2923 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2924 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2925 dtype != NFT_DATA_VERDICT)
2928 if (dtype != NFT_DATA_VERDICT) {
2929 if (nla[NFTA_SET_DATA_LEN] == NULL)
2931 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2932 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
2935 desc.dlen = sizeof(struct nft_verdict);
2936 } else if (flags & NFT_SET_MAP)
2939 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
2940 if (!(flags & NFT_SET_OBJECT))
2943 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
2944 if (objtype == NFT_OBJECT_UNSPEC ||
2945 objtype > NFT_OBJECT_MAX)
2947 } else if (flags & NFT_SET_OBJECT)
2950 objtype = NFT_OBJECT_UNSPEC;
2953 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2954 if (!(flags & NFT_SET_TIMEOUT))
2956 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
2957 nla[NFTA_SET_TIMEOUT])));
2960 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2961 if (!(flags & NFT_SET_TIMEOUT))
2963 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2966 policy = NFT_SET_POL_PERFORMANCE;
2967 if (nla[NFTA_SET_POLICY] != NULL)
2968 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2970 if (nla[NFTA_SET_DESC] != NULL) {
2971 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2976 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2978 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2980 return PTR_ERR(afi);
2982 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
2984 return PTR_ERR(table);
2986 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
2988 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
2990 if (PTR_ERR(set) != -ENOENT)
2991 return PTR_ERR(set);
2993 if (nlh->nlmsg_flags & NLM_F_EXCL)
2995 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3000 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3003 ops = nft_select_set_ops(nla, &desc, policy);
3005 return PTR_ERR(ops);
3008 if (nla[NFTA_SET_USERDATA])
3009 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3012 if (ops->privsize != NULL)
3013 size = ops->privsize(nla);
3016 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3020 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
3021 err = nf_tables_set_alloc_name(&ctx, set, name);
3027 udata = set->data + size;
3028 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3031 INIT_LIST_HEAD(&set->bindings);
3034 set->klen = desc.klen;
3036 set->objtype = objtype;
3037 set->dlen = desc.dlen;
3039 set->size = desc.size;
3040 set->policy = policy;
3043 set->timeout = timeout;
3044 set->gc_int = gc_int;
3046 err = ops->init(set, &desc, nla);
3050 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3054 list_add_tail_rcu(&set->list, &table->sets);
3063 module_put(ops->owner);
3067 static void nft_set_destroy(struct nft_set *set)
3069 set->ops->destroy(set);
3070 module_put(set->ops->owner);
3074 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3076 list_del_rcu(&set->list);
3077 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
3078 nft_set_destroy(set);
3081 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3082 struct sk_buff *skb, const struct nlmsghdr *nlh,
3083 const struct nlattr * const nla[])
3085 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3086 u8 genmask = nft_genmask_next(net);
3087 struct nft_set *set;
3091 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3092 return -EAFNOSUPPORT;
3093 if (nla[NFTA_SET_TABLE] == NULL)
3096 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
3100 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3102 return PTR_ERR(set);
3103 if (!list_empty(&set->bindings))
3106 return nft_delset(&ctx, set);
3109 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3110 struct nft_set *set,
3111 const struct nft_set_iter *iter,
3112 struct nft_set_elem *elem)
3114 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3115 enum nft_registers dreg;
3117 dreg = nft_type_to_reg(set->dtype);
3118 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3119 set->dtype == NFT_DATA_VERDICT ?
3120 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3124 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3125 struct nft_set_binding *binding)
3127 struct nft_set_binding *i;
3128 struct nft_set_iter iter;
3130 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
3133 if (binding->flags & NFT_SET_MAP) {
3134 /* If the set is already bound to the same chain all
3135 * jumps are already validated for that chain.
3137 list_for_each_entry(i, &set->bindings, list) {
3138 if (i->flags & NFT_SET_MAP &&
3139 i->chain == binding->chain)
3143 iter.genmask = nft_genmask_next(ctx->net);
3147 iter.fn = nf_tables_bind_check_setelem;
3149 set->ops->walk(ctx, set, &iter);
3154 binding->chain = ctx->chain;
3155 list_add_tail_rcu(&binding->list, &set->bindings);
3158 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3160 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3161 struct nft_set_binding *binding)
3163 list_del_rcu(&binding->list);
3165 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
3166 nft_is_active(ctx->net, set))
3167 nf_tables_set_destroy(ctx, set);
3169 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3171 const struct nft_set_ext_type nft_set_ext_types[] = {
3172 [NFT_SET_EXT_KEY] = {
3173 .align = __alignof__(u32),
3175 [NFT_SET_EXT_DATA] = {
3176 .align = __alignof__(u32),
3178 [NFT_SET_EXT_EXPR] = {
3179 .align = __alignof__(struct nft_expr),
3181 [NFT_SET_EXT_OBJREF] = {
3182 .len = sizeof(struct nft_object *),
3183 .align = __alignof__(struct nft_object *),
3185 [NFT_SET_EXT_FLAGS] = {
3187 .align = __alignof__(u8),
3189 [NFT_SET_EXT_TIMEOUT] = {
3191 .align = __alignof__(u64),
3193 [NFT_SET_EXT_EXPIRATION] = {
3194 .len = sizeof(unsigned long),
3195 .align = __alignof__(unsigned long),
3197 [NFT_SET_EXT_USERDATA] = {
3198 .len = sizeof(struct nft_userdata),
3199 .align = __alignof__(struct nft_userdata),
3202 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3208 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3209 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3210 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3211 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3212 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3213 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3214 .len = NFT_USERDATA_MAXLEN },
3217 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3218 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3219 .len = NFT_TABLE_MAXNAMELEN - 1 },
3220 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3221 .len = NFT_SET_MAXNAMELEN - 1 },
3222 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3223 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3226 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3227 const struct sk_buff *skb,
3228 const struct nlmsghdr *nlh,
3229 const struct nlattr * const nla[],
3232 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3233 struct nft_af_info *afi;
3234 struct nft_table *table;
3236 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3238 return PTR_ERR(afi);
3240 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3243 return PTR_ERR(table);
3245 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
3249 static int nf_tables_fill_setelem(struct sk_buff *skb,
3250 const struct nft_set *set,
3251 const struct nft_set_elem *elem)
3253 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3254 unsigned char *b = skb_tail_pointer(skb);
3255 struct nlattr *nest;
3257 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3259 goto nla_put_failure;
3261 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3262 NFT_DATA_VALUE, set->klen) < 0)
3263 goto nla_put_failure;
3265 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3266 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3267 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3269 goto nla_put_failure;
3271 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3272 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3273 goto nla_put_failure;
3275 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3276 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3277 (*nft_set_ext_obj(ext))->name) < 0)
3278 goto nla_put_failure;
3280 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3281 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3282 htonl(*nft_set_ext_flags(ext))))
3283 goto nla_put_failure;
3285 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3286 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3287 cpu_to_be64(jiffies_to_msecs(
3288 *nft_set_ext_timeout(ext))),
3290 goto nla_put_failure;
3292 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3293 unsigned long expires, now = jiffies;
3295 expires = *nft_set_ext_expiration(ext);
3296 if (time_before(now, expires))
3301 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3302 cpu_to_be64(jiffies_to_msecs(expires)),
3304 goto nla_put_failure;
3307 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3308 struct nft_userdata *udata;
3310 udata = nft_set_ext_userdata(ext);
3311 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3312 udata->len + 1, udata->data))
3313 goto nla_put_failure;
3316 nla_nest_end(skb, nest);
3324 struct nft_set_dump_args {
3325 const struct netlink_callback *cb;
3326 struct nft_set_iter iter;
3327 struct sk_buff *skb;
3330 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3331 struct nft_set *set,
3332 const struct nft_set_iter *iter,
3333 struct nft_set_elem *elem)
3335 struct nft_set_dump_args *args;
3337 args = container_of(iter, struct nft_set_dump_args, iter);
3338 return nf_tables_fill_setelem(args->skb, set, elem);
3341 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3343 struct net *net = sock_net(skb->sk);
3344 u8 genmask = nft_genmask_cur(net);
3345 struct nft_set *set;
3346 struct nft_set_dump_args args;
3348 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3349 struct nfgenmsg *nfmsg;
3350 struct nlmsghdr *nlh;
3351 struct nlattr *nest;
3355 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3356 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
3360 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
3361 (void *)nla, genmask);
3365 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3368 return PTR_ERR(set);
3370 event = NFT_MSG_NEWSETELEM;
3371 event |= NFNL_SUBSYS_NFTABLES << 8;
3372 portid = NETLINK_CB(cb->skb).portid;
3373 seq = cb->nlh->nlmsg_seq;
3375 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3378 goto nla_put_failure;
3380 nfmsg = nlmsg_data(nlh);
3381 nfmsg->nfgen_family = ctx.afi->family;
3382 nfmsg->version = NFNETLINK_V0;
3383 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
3385 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3386 goto nla_put_failure;
3387 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3388 goto nla_put_failure;
3390 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3392 goto nla_put_failure;
3396 args.iter.genmask = nft_genmask_cur(ctx.net);
3397 args.iter.skip = cb->args[0];
3398 args.iter.count = 0;
3400 args.iter.fn = nf_tables_dump_setelem;
3401 set->ops->walk(&ctx, set, &args.iter);
3403 nla_nest_end(skb, nest);
3404 nlmsg_end(skb, nlh);
3406 if (args.iter.err && args.iter.err != -EMSGSIZE)
3407 return args.iter.err;
3408 if (args.iter.count == cb->args[0])
3411 cb->args[0] = args.iter.count;
3418 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3419 struct sk_buff *skb, const struct nlmsghdr *nlh,
3420 const struct nlattr * const nla[])
3422 u8 genmask = nft_genmask_cur(net);
3423 const struct nft_set *set;
3427 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3431 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3434 return PTR_ERR(set);
3436 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3437 struct netlink_dump_control c = {
3438 .dump = nf_tables_dump_set,
3440 return netlink_dump_start(nlsk, skb, nlh, &c);
3445 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3446 const struct nft_ctx *ctx, u32 seq,
3447 u32 portid, int event, u16 flags,
3448 const struct nft_set *set,
3449 const struct nft_set_elem *elem)
3451 struct nfgenmsg *nfmsg;
3452 struct nlmsghdr *nlh;
3453 struct nlattr *nest;
3456 event |= NFNL_SUBSYS_NFTABLES << 8;
3457 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3460 goto nla_put_failure;
3462 nfmsg = nlmsg_data(nlh);
3463 nfmsg->nfgen_family = ctx->afi->family;
3464 nfmsg->version = NFNETLINK_V0;
3465 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3467 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3468 goto nla_put_failure;
3469 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3470 goto nla_put_failure;
3472 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3474 goto nla_put_failure;
3476 err = nf_tables_fill_setelem(skb, set, elem);
3478 goto nla_put_failure;
3480 nla_nest_end(skb, nest);
3482 nlmsg_end(skb, nlh);
3486 nlmsg_trim(skb, nlh);
3490 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
3491 const struct nft_set *set,
3492 const struct nft_set_elem *elem,
3493 int event, u16 flags)
3495 struct net *net = ctx->net;
3496 u32 portid = ctx->portid;
3497 struct sk_buff *skb;
3500 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3503 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3507 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3514 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3518 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3521 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3523 struct nft_set *set)
3525 struct nft_trans *trans;
3527 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3531 nft_trans_elem_set(trans) = set;
3535 void *nft_set_elem_init(const struct nft_set *set,
3536 const struct nft_set_ext_tmpl *tmpl,
3537 const u32 *key, const u32 *data,
3538 u64 timeout, gfp_t gfp)
3540 struct nft_set_ext *ext;
3543 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3547 ext = nft_set_elem_ext(set, elem);
3548 nft_set_ext_init(ext, tmpl);
3550 memcpy(nft_set_ext_key(ext), key, set->klen);
3551 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3552 memcpy(nft_set_ext_data(ext), data, set->dlen);
3553 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3554 *nft_set_ext_expiration(ext) =
3556 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3557 *nft_set_ext_timeout(ext) = timeout;
3562 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
3565 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3567 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3568 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3569 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
3570 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3571 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3572 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
3573 (*nft_set_ext_obj(ext))->use--;
3576 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3578 static int nft_setelem_parse_flags(const struct nft_set *set,
3579 const struct nlattr *attr, u32 *flags)
3584 *flags = ntohl(nla_get_be32(attr));
3585 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3587 if (!(set->flags & NFT_SET_INTERVAL) &&
3588 *flags & NFT_SET_ELEM_INTERVAL_END)
3594 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3595 const struct nlattr *attr, u32 nlmsg_flags)
3597 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3598 u8 genmask = nft_genmask_next(ctx->net);
3599 struct nft_data_desc d1, d2;
3600 struct nft_set_ext_tmpl tmpl;
3601 struct nft_set_ext *ext, *ext2;
3602 struct nft_set_elem elem;
3603 struct nft_set_binding *binding;
3604 struct nft_object *obj = NULL;
3605 struct nft_userdata *udata;
3606 struct nft_data data;
3607 enum nft_registers dreg;
3608 struct nft_trans *trans;
3614 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3615 nft_set_elem_policy);
3619 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3622 nft_set_ext_prepare(&tmpl);
3624 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3628 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3630 if (set->flags & NFT_SET_MAP) {
3631 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3632 !(flags & NFT_SET_ELEM_INTERVAL_END))
3634 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3635 flags & NFT_SET_ELEM_INTERVAL_END)
3638 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3643 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3644 if (!(set->flags & NFT_SET_TIMEOUT))
3646 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3647 nla[NFTA_SET_ELEM_TIMEOUT])));
3648 } else if (set->flags & NFT_SET_TIMEOUT) {
3649 timeout = set->timeout;
3652 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3653 nla[NFTA_SET_ELEM_KEY]);
3657 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3660 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3662 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3663 if (timeout != set->timeout)
3664 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3667 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
3668 if (!(set->flags & NFT_SET_OBJECT)) {
3672 obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
3673 set->objtype, genmask);
3678 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
3681 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3682 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3683 nla[NFTA_SET_ELEM_DATA]);
3688 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3691 dreg = nft_type_to_reg(set->dtype);
3692 list_for_each_entry(binding, &set->bindings, list) {
3693 struct nft_ctx bind_ctx = {
3696 .table = ctx->table,
3697 .chain = (struct nft_chain *)binding->chain,
3700 if (!(binding->flags & NFT_SET_MAP))
3703 err = nft_validate_register_store(&bind_ctx, dreg,
3710 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
3713 /* The full maximum length of userdata can exceed the maximum
3714 * offset value (U8_MAX) for following extensions, therefor it
3715 * must be the last extension added.
3718 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3719 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3721 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3726 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
3727 timeout, GFP_KERNEL);
3728 if (elem.priv == NULL)
3731 ext = nft_set_elem_ext(set, elem.priv);
3733 *nft_set_ext_flags(ext) = flags;
3735 udata = nft_set_ext_userdata(ext);
3736 udata->len = ulen - 1;
3737 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3740 *nft_set_ext_obj(ext) = obj;
3744 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3748 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
3749 err = set->ops->insert(ctx->net, set, &elem, &ext2);
3751 if (err == -EEXIST) {
3752 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3753 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
3754 memcmp(nft_set_ext_data(ext),
3755 nft_set_ext_data(ext2), set->dlen) != 0) ||
3756 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3757 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
3758 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
3760 else if (!(nlmsg_flags & NLM_F_EXCL))
3767 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
3772 nft_trans_elem(trans) = elem;
3773 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3777 set->ops->remove(ctx->net, set, &elem);
3783 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3784 nft_data_uninit(&data, d2.type);
3786 nft_data_uninit(&elem.key.val, d1.type);
3791 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3792 struct sk_buff *skb, const struct nlmsghdr *nlh,
3793 const struct nlattr * const nla[])
3795 u8 genmask = nft_genmask_next(net);
3796 const struct nlattr *attr;
3797 struct nft_set *set;
3801 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3804 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3808 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3811 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3812 set = nf_tables_set_lookup_byid(net,
3813 nla[NFTA_SET_ELEM_LIST_SET_ID],
3817 return PTR_ERR(set);
3820 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3823 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3824 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
3831 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3832 const struct nlattr *attr)
3834 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3835 struct nft_set_ext_tmpl tmpl;
3836 struct nft_data_desc desc;
3837 struct nft_set_elem elem;
3838 struct nft_set_ext *ext;
3839 struct nft_trans *trans;
3844 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3845 nft_set_elem_policy);
3850 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3853 nft_set_ext_prepare(&tmpl);
3855 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3859 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3861 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3862 nla[NFTA_SET_ELEM_KEY]);
3867 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3870 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3873 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3875 if (elem.priv == NULL)
3878 ext = nft_set_elem_ext(set, elem.priv);
3880 *nft_set_ext_flags(ext) = flags;
3882 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3883 if (trans == NULL) {
3888 priv = set->ops->deactivate(ctx->net, set, &elem);
3896 nft_trans_elem(trans) = elem;
3897 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3905 nft_data_uninit(&elem.key.val, desc.type);
3910 static int nft_flush_set(const struct nft_ctx *ctx,
3911 struct nft_set *set,
3912 const struct nft_set_iter *iter,
3913 struct nft_set_elem *elem)
3915 struct nft_trans *trans;
3918 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
3919 sizeof(struct nft_trans_elem), GFP_ATOMIC);
3923 if (!set->ops->flush(ctx->net, set, elem->priv)) {
3929 nft_trans_elem_set(trans) = set;
3930 nft_trans_elem(trans) = *elem;
3931 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3939 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3940 struct sk_buff *skb, const struct nlmsghdr *nlh,
3941 const struct nlattr * const nla[])
3943 u8 genmask = nft_genmask_next(net);
3944 const struct nlattr *attr;
3945 struct nft_set *set;
3949 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3953 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3956 return PTR_ERR(set);
3957 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3960 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
3961 struct nft_set_iter iter = {
3963 .fn = nft_flush_set,
3965 set->ops->walk(&ctx, set, &iter);
3970 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3971 err = nft_del_setelem(&ctx, set, attr);
3980 void nft_set_gc_batch_release(struct rcu_head *rcu)
3982 struct nft_set_gc_batch *gcb;
3985 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
3986 for (i = 0; i < gcb->head.cnt; i++)
3987 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
3990 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
3992 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
3995 struct nft_set_gc_batch *gcb;
3997 gcb = kzalloc(sizeof(*gcb), gfp);
4000 gcb->head.set = set;
4003 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4010 * nft_register_obj- register nf_tables stateful object type
4013 * Registers the object type for use with nf_tables. Returns zero on
4014 * success or a negative errno code otherwise.
4016 int nft_register_obj(struct nft_object_type *obj_type)
4018 if (obj_type->type == NFT_OBJECT_UNSPEC)
4021 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4022 list_add_rcu(&obj_type->list, &nf_tables_objects);
4023 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4026 EXPORT_SYMBOL_GPL(nft_register_obj);
4029 * nft_unregister_obj - unregister nf_tables object type
4032 * Unregisters the object type for use with nf_tables.
4034 void nft_unregister_obj(struct nft_object_type *obj_type)
4036 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4037 list_del_rcu(&obj_type->list);
4038 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4040 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4042 struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
4043 const struct nlattr *nla,
4044 u32 objtype, u8 genmask)
4046 struct nft_object *obj;
4048 list_for_each_entry(obj, &table->objects, list) {
4049 if (!nla_strcmp(nla, obj->name) &&
4050 objtype == obj->type->type &&
4051 nft_active_genmask(obj, genmask))
4054 return ERR_PTR(-ENOENT);
4056 EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
4058 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4059 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4060 .len = NFT_TABLE_MAXNAMELEN - 1 },
4061 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4062 .len = NFT_OBJ_MAXNAMELEN - 1 },
4063 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4064 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4067 static struct nft_object *nft_obj_init(const struct nft_object_type *type,
4068 const struct nlattr *attr)
4070 struct nlattr *tb[type->maxattr + 1];
4071 struct nft_object *obj;
4075 err = nla_parse_nested(tb, type->maxattr, attr, type->policy);
4079 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4083 obj = kzalloc(sizeof(struct nft_object) + type->size, GFP_KERNEL);
4087 err = type->init((const struct nlattr * const *)tb, obj);
4096 return ERR_PTR(err);
4099 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
4100 struct nft_object *obj, bool reset)
4102 struct nlattr *nest;
4104 nest = nla_nest_start(skb, attr);
4106 goto nla_put_failure;
4107 if (obj->type->dump(skb, obj, reset) < 0)
4108 goto nla_put_failure;
4109 nla_nest_end(skb, nest);
4116 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4118 const struct nft_object_type *type;
4120 list_for_each_entry(type, &nf_tables_objects, list) {
4121 if (objtype == type->type)
4127 static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4129 const struct nft_object_type *type;
4131 type = __nft_obj_type_get(objtype);
4132 if (type != NULL && try_module_get(type->owner))
4135 #ifdef CONFIG_MODULES
4137 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4138 request_module("nft-obj-%u", objtype);
4139 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4140 if (__nft_obj_type_get(objtype))
4141 return ERR_PTR(-EAGAIN);
4144 return ERR_PTR(-ENOENT);
4147 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4148 struct sk_buff *skb, const struct nlmsghdr *nlh,
4149 const struct nlattr * const nla[])
4151 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4152 const struct nft_object_type *type;
4153 u8 genmask = nft_genmask_next(net);
4154 int family = nfmsg->nfgen_family;
4155 struct nft_af_info *afi;
4156 struct nft_table *table;
4157 struct nft_object *obj;
4162 if (!nla[NFTA_OBJ_TYPE] ||
4163 !nla[NFTA_OBJ_NAME] ||
4164 !nla[NFTA_OBJ_DATA])
4167 afi = nf_tables_afinfo_lookup(net, family, true);
4169 return PTR_ERR(afi);
4171 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4173 return PTR_ERR(table);
4175 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4176 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4183 if (nlh->nlmsg_flags & NLM_F_EXCL)
4189 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4191 type = nft_obj_type_get(objtype);
4193 return PTR_ERR(type);
4195 obj = nft_obj_init(type, nla[NFTA_OBJ_DATA]);
4201 nla_strlcpy(obj->name, nla[NFTA_OBJ_NAME], NFT_OBJ_MAXNAMELEN);
4203 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4207 list_add_tail_rcu(&obj->list, &table->objects);
4211 if (obj->type->destroy)
4212 obj->type->destroy(obj);
4215 module_put(type->owner);
4219 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4220 u32 portid, u32 seq, int event, u32 flags,
4221 int family, const struct nft_table *table,
4222 struct nft_object *obj, bool reset)
4224 struct nfgenmsg *nfmsg;
4225 struct nlmsghdr *nlh;
4227 event |= NFNL_SUBSYS_NFTABLES << 8;
4228 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4230 goto nla_put_failure;
4232 nfmsg = nlmsg_data(nlh);
4233 nfmsg->nfgen_family = family;
4234 nfmsg->version = NFNETLINK_V0;
4235 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4237 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4238 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
4239 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->type->type)) ||
4240 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
4241 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
4242 goto nla_put_failure;
4244 nlmsg_end(skb, nlh);
4248 nlmsg_trim(skb, nlh);
4252 struct nft_obj_filter {
4253 char table[NFT_OBJ_MAXNAMELEN];
4257 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4259 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4260 const struct nft_af_info *afi;
4261 const struct nft_table *table;
4262 unsigned int idx = 0, s_idx = cb->args[0];
4263 struct nft_obj_filter *filter = cb->data;
4264 struct net *net = sock_net(skb->sk);
4265 int family = nfmsg->nfgen_family;
4266 struct nft_object *obj;
4269 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4273 cb->seq = net->nft.base_seq;
4275 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
4276 if (family != NFPROTO_UNSPEC && family != afi->family)
4279 list_for_each_entry_rcu(table, &afi->tables, list) {
4280 list_for_each_entry_rcu(obj, &table->objects, list) {
4281 if (!nft_is_active(net, obj))
4286 memset(&cb->args[1], 0,
4287 sizeof(cb->args) - sizeof(cb->args[0]));
4288 if (filter && filter->table[0] &&
4289 strcmp(filter->table, table->name))
4292 filter->type != NFT_OBJECT_UNSPEC &&
4293 obj->type->type != filter->type)
4296 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4299 NLM_F_MULTI | NLM_F_APPEND,
4300 afi->family, table, obj, reset) < 0)
4303 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4316 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4323 static struct nft_obj_filter *
4324 nft_obj_filter_alloc(const struct nlattr * const nla[])
4326 struct nft_obj_filter *filter;
4328 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
4330 return ERR_PTR(-ENOMEM);
4332 if (nla[NFTA_OBJ_TABLE])
4333 nla_strlcpy(filter->table, nla[NFTA_OBJ_TABLE],
4334 NFT_TABLE_MAXNAMELEN);
4335 if (nla[NFTA_OBJ_TYPE])
4336 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4341 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
4342 struct sk_buff *skb, const struct nlmsghdr *nlh,
4343 const struct nlattr * const nla[])
4345 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4346 u8 genmask = nft_genmask_cur(net);
4347 int family = nfmsg->nfgen_family;
4348 const struct nft_af_info *afi;
4349 const struct nft_table *table;
4350 struct nft_object *obj;
4351 struct sk_buff *skb2;
4356 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4357 struct netlink_dump_control c = {
4358 .dump = nf_tables_dump_obj,
4359 .done = nf_tables_dump_obj_done,
4362 if (nla[NFTA_OBJ_TABLE] ||
4363 nla[NFTA_OBJ_TYPE]) {
4364 struct nft_obj_filter *filter;
4366 filter = nft_obj_filter_alloc(nla);
4372 return netlink_dump_start(nlsk, skb, nlh, &c);
4375 if (!nla[NFTA_OBJ_NAME] ||
4376 !nla[NFTA_OBJ_TYPE])
4379 afi = nf_tables_afinfo_lookup(net, family, false);
4381 return PTR_ERR(afi);
4383 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4385 return PTR_ERR(table);
4387 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4388 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4390 return PTR_ERR(obj);
4392 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4396 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4399 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
4400 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
4401 family, table, obj, reset);
4405 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4413 static void nft_obj_destroy(struct nft_object *obj)
4415 if (obj->type->destroy)
4416 obj->type->destroy(obj);
4418 module_put(obj->type->owner);
4422 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
4423 struct sk_buff *skb, const struct nlmsghdr *nlh,
4424 const struct nlattr * const nla[])
4426 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4427 u8 genmask = nft_genmask_next(net);
4428 int family = nfmsg->nfgen_family;
4429 struct nft_af_info *afi;
4430 struct nft_table *table;
4431 struct nft_object *obj;
4435 if (!nla[NFTA_OBJ_TYPE] ||
4436 !nla[NFTA_OBJ_NAME])
4439 afi = nf_tables_afinfo_lookup(net, family, true);
4441 return PTR_ERR(afi);
4443 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4445 return PTR_ERR(table);
4447 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4448 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4450 return PTR_ERR(obj);
4454 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4456 return nft_delobj(&ctx, obj);
4459 void nft_obj_notify(struct net *net, struct nft_table *table,
4460 struct nft_object *obj, u32 portid, u32 seq, int event,
4461 int family, int report, gfp_t gfp)
4463 struct sk_buff *skb;
4467 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4470 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
4474 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
4481 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
4484 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4486 EXPORT_SYMBOL_GPL(nft_obj_notify);
4488 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
4489 struct nft_object *obj, int event)
4491 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
4492 ctx->afi->family, ctx->report, GFP_KERNEL);
4495 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
4496 u32 portid, u32 seq)
4498 struct nlmsghdr *nlh;
4499 struct nfgenmsg *nfmsg;
4500 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
4502 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
4504 goto nla_put_failure;
4506 nfmsg = nlmsg_data(nlh);
4507 nfmsg->nfgen_family = AF_UNSPEC;
4508 nfmsg->version = NFNETLINK_V0;
4509 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4511 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
4512 goto nla_put_failure;
4514 nlmsg_end(skb, nlh);
4518 nlmsg_trim(skb, nlh);
4522 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
4525 struct nlmsghdr *nlh = nlmsg_hdr(skb);
4526 struct sk_buff *skb2;
4529 if (nlmsg_report(nlh) &&
4530 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4533 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4537 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4544 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4545 nlmsg_report(nlh), GFP_KERNEL);
4548 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4552 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
4553 struct sk_buff *skb, const struct nlmsghdr *nlh,
4554 const struct nlattr * const nla[])
4556 struct sk_buff *skb2;
4559 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4563 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4568 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4574 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
4575 [NFT_MSG_NEWTABLE] = {
4576 .call_batch = nf_tables_newtable,
4577 .attr_count = NFTA_TABLE_MAX,
4578 .policy = nft_table_policy,
4580 [NFT_MSG_GETTABLE] = {
4581 .call = nf_tables_gettable,
4582 .attr_count = NFTA_TABLE_MAX,
4583 .policy = nft_table_policy,
4585 [NFT_MSG_DELTABLE] = {
4586 .call_batch = nf_tables_deltable,
4587 .attr_count = NFTA_TABLE_MAX,
4588 .policy = nft_table_policy,
4590 [NFT_MSG_NEWCHAIN] = {
4591 .call_batch = nf_tables_newchain,
4592 .attr_count = NFTA_CHAIN_MAX,
4593 .policy = nft_chain_policy,
4595 [NFT_MSG_GETCHAIN] = {
4596 .call = nf_tables_getchain,
4597 .attr_count = NFTA_CHAIN_MAX,
4598 .policy = nft_chain_policy,
4600 [NFT_MSG_DELCHAIN] = {
4601 .call_batch = nf_tables_delchain,
4602 .attr_count = NFTA_CHAIN_MAX,
4603 .policy = nft_chain_policy,
4605 [NFT_MSG_NEWRULE] = {
4606 .call_batch = nf_tables_newrule,
4607 .attr_count = NFTA_RULE_MAX,
4608 .policy = nft_rule_policy,
4610 [NFT_MSG_GETRULE] = {
4611 .call = nf_tables_getrule,
4612 .attr_count = NFTA_RULE_MAX,
4613 .policy = nft_rule_policy,
4615 [NFT_MSG_DELRULE] = {
4616 .call_batch = nf_tables_delrule,
4617 .attr_count = NFTA_RULE_MAX,
4618 .policy = nft_rule_policy,
4620 [NFT_MSG_NEWSET] = {
4621 .call_batch = nf_tables_newset,
4622 .attr_count = NFTA_SET_MAX,
4623 .policy = nft_set_policy,
4625 [NFT_MSG_GETSET] = {
4626 .call = nf_tables_getset,
4627 .attr_count = NFTA_SET_MAX,
4628 .policy = nft_set_policy,
4630 [NFT_MSG_DELSET] = {
4631 .call_batch = nf_tables_delset,
4632 .attr_count = NFTA_SET_MAX,
4633 .policy = nft_set_policy,
4635 [NFT_MSG_NEWSETELEM] = {
4636 .call_batch = nf_tables_newsetelem,
4637 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4638 .policy = nft_set_elem_list_policy,
4640 [NFT_MSG_GETSETELEM] = {
4641 .call = nf_tables_getsetelem,
4642 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4643 .policy = nft_set_elem_list_policy,
4645 [NFT_MSG_DELSETELEM] = {
4646 .call_batch = nf_tables_delsetelem,
4647 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4648 .policy = nft_set_elem_list_policy,
4650 [NFT_MSG_GETGEN] = {
4651 .call = nf_tables_getgen,
4653 [NFT_MSG_NEWOBJ] = {
4654 .call_batch = nf_tables_newobj,
4655 .attr_count = NFTA_OBJ_MAX,
4656 .policy = nft_obj_policy,
4658 [NFT_MSG_GETOBJ] = {
4659 .call = nf_tables_getobj,
4660 .attr_count = NFTA_OBJ_MAX,
4661 .policy = nft_obj_policy,
4663 [NFT_MSG_DELOBJ] = {
4664 .call_batch = nf_tables_delobj,
4665 .attr_count = NFTA_OBJ_MAX,
4666 .policy = nft_obj_policy,
4668 [NFT_MSG_GETOBJ_RESET] = {
4669 .call = nf_tables_getobj,
4670 .attr_count = NFTA_OBJ_MAX,
4671 .policy = nft_obj_policy,
4675 static void nft_chain_commit_update(struct nft_trans *trans)
4677 struct nft_base_chain *basechain;
4679 if (nft_trans_chain_name(trans)[0])
4680 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
4682 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
4685 basechain = nft_base_chain(trans->ctx.chain);
4686 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
4688 switch (nft_trans_chain_policy(trans)) {
4691 basechain->policy = nft_trans_chain_policy(trans);
4696 static void nf_tables_commit_release(struct nft_trans *trans)
4698 switch (trans->msg_type) {
4699 case NFT_MSG_DELTABLE:
4700 nf_tables_table_destroy(&trans->ctx);
4702 case NFT_MSG_DELCHAIN:
4703 nf_tables_chain_destroy(trans->ctx.chain);
4705 case NFT_MSG_DELRULE:
4706 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4708 case NFT_MSG_DELSET:
4709 nft_set_destroy(nft_trans_set(trans));
4711 case NFT_MSG_DELSETELEM:
4712 nft_set_elem_destroy(nft_trans_elem_set(trans),
4713 nft_trans_elem(trans).priv, true);
4715 case NFT_MSG_DELOBJ:
4716 nft_obj_destroy(nft_trans_obj(trans));
4722 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
4724 struct nft_trans *trans, *next;
4725 struct nft_trans_elem *te;
4727 /* Bump generation counter, invalidate any dump in progress */
4728 while (++net->nft.base_seq == 0);
4730 /* A new generation has just started */
4731 net->nft.gencursor = nft_gencursor_next(net);
4733 /* Make sure all packets have left the previous generation before
4734 * purging old rules.
4738 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4739 switch (trans->msg_type) {
4740 case NFT_MSG_NEWTABLE:
4741 if (nft_trans_table_update(trans)) {
4742 if (!nft_trans_table_enable(trans)) {
4743 nf_tables_table_disable(net,
4746 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4749 nft_clear(net, trans->ctx.table);
4751 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
4752 nft_trans_destroy(trans);
4754 case NFT_MSG_DELTABLE:
4755 list_del_rcu(&trans->ctx.table->list);
4756 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
4758 case NFT_MSG_NEWCHAIN:
4759 if (nft_trans_chain_update(trans))
4760 nft_chain_commit_update(trans);
4762 nft_clear(net, trans->ctx.chain);
4764 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
4765 nft_trans_destroy(trans);
4767 case NFT_MSG_DELCHAIN:
4768 list_del_rcu(&trans->ctx.chain->list);
4769 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
4770 nf_tables_unregister_hooks(trans->ctx.net,
4773 trans->ctx.afi->nops);
4775 case NFT_MSG_NEWRULE:
4776 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4777 nf_tables_rule_notify(&trans->ctx,
4778 nft_trans_rule(trans),
4780 nft_trans_destroy(trans);
4782 case NFT_MSG_DELRULE:
4783 list_del_rcu(&nft_trans_rule(trans)->list);
4784 nf_tables_rule_notify(&trans->ctx,
4785 nft_trans_rule(trans),
4788 case NFT_MSG_NEWSET:
4789 nft_clear(net, nft_trans_set(trans));
4790 /* This avoids hitting -EBUSY when deleting the table
4791 * from the transaction.
4793 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4794 !list_empty(&nft_trans_set(trans)->bindings))
4795 trans->ctx.table->use--;
4797 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4798 NFT_MSG_NEWSET, GFP_KERNEL);
4799 nft_trans_destroy(trans);
4801 case NFT_MSG_DELSET:
4802 list_del_rcu(&nft_trans_set(trans)->list);
4803 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4804 NFT_MSG_DELSET, GFP_KERNEL);
4806 case NFT_MSG_NEWSETELEM:
4807 te = (struct nft_trans_elem *)trans->data;
4809 te->set->ops->activate(net, te->set, &te->elem);
4810 nf_tables_setelem_notify(&trans->ctx, te->set,
4812 NFT_MSG_NEWSETELEM, 0);
4813 nft_trans_destroy(trans);
4815 case NFT_MSG_DELSETELEM:
4816 te = (struct nft_trans_elem *)trans->data;
4818 nf_tables_setelem_notify(&trans->ctx, te->set,
4820 NFT_MSG_DELSETELEM, 0);
4821 te->set->ops->remove(net, te->set, &te->elem);
4822 atomic_dec(&te->set->nelems);
4825 case NFT_MSG_NEWOBJ:
4826 nft_clear(net, nft_trans_obj(trans));
4827 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4829 nft_trans_destroy(trans);
4831 case NFT_MSG_DELOBJ:
4832 list_del_rcu(&nft_trans_obj(trans)->list);
4833 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4841 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4842 list_del(&trans->list);
4843 nf_tables_commit_release(trans);
4846 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
4851 static void nf_tables_abort_release(struct nft_trans *trans)
4853 switch (trans->msg_type) {
4854 case NFT_MSG_NEWTABLE:
4855 nf_tables_table_destroy(&trans->ctx);
4857 case NFT_MSG_NEWCHAIN:
4858 nf_tables_chain_destroy(trans->ctx.chain);
4860 case NFT_MSG_NEWRULE:
4861 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4863 case NFT_MSG_NEWSET:
4864 nft_set_destroy(nft_trans_set(trans));
4866 case NFT_MSG_NEWSETELEM:
4867 nft_set_elem_destroy(nft_trans_elem_set(trans),
4868 nft_trans_elem(trans).priv, true);
4870 case NFT_MSG_NEWOBJ:
4871 nft_obj_destroy(nft_trans_obj(trans));
4877 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
4879 struct nft_trans *trans, *next;
4880 struct nft_trans_elem *te;
4882 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4884 switch (trans->msg_type) {
4885 case NFT_MSG_NEWTABLE:
4886 if (nft_trans_table_update(trans)) {
4887 if (nft_trans_table_enable(trans)) {
4888 nf_tables_table_disable(net,
4891 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4893 nft_trans_destroy(trans);
4895 list_del_rcu(&trans->ctx.table->list);
4898 case NFT_MSG_DELTABLE:
4899 nft_clear(trans->ctx.net, trans->ctx.table);
4900 nft_trans_destroy(trans);
4902 case NFT_MSG_NEWCHAIN:
4903 if (nft_trans_chain_update(trans)) {
4904 free_percpu(nft_trans_chain_stats(trans));
4906 nft_trans_destroy(trans);
4908 trans->ctx.table->use--;
4909 list_del_rcu(&trans->ctx.chain->list);
4910 nf_tables_unregister_hooks(trans->ctx.net,
4913 trans->ctx.afi->nops);
4916 case NFT_MSG_DELCHAIN:
4917 trans->ctx.table->use++;
4918 nft_clear(trans->ctx.net, trans->ctx.chain);
4919 nft_trans_destroy(trans);
4921 case NFT_MSG_NEWRULE:
4922 trans->ctx.chain->use--;
4923 list_del_rcu(&nft_trans_rule(trans)->list);
4925 case NFT_MSG_DELRULE:
4926 trans->ctx.chain->use++;
4927 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4928 nft_trans_destroy(trans);
4930 case NFT_MSG_NEWSET:
4931 trans->ctx.table->use--;
4932 list_del_rcu(&nft_trans_set(trans)->list);
4934 case NFT_MSG_DELSET:
4935 trans->ctx.table->use++;
4936 nft_clear(trans->ctx.net, nft_trans_set(trans));
4937 nft_trans_destroy(trans);
4939 case NFT_MSG_NEWSETELEM:
4940 te = (struct nft_trans_elem *)trans->data;
4942 te->set->ops->remove(net, te->set, &te->elem);
4943 atomic_dec(&te->set->nelems);
4945 case NFT_MSG_DELSETELEM:
4946 te = (struct nft_trans_elem *)trans->data;
4948 te->set->ops->activate(net, te->set, &te->elem);
4951 nft_trans_destroy(trans);
4953 case NFT_MSG_NEWOBJ:
4954 trans->ctx.table->use--;
4955 list_del_rcu(&nft_trans_obj(trans)->list);
4957 case NFT_MSG_DELOBJ:
4958 trans->ctx.table->use++;
4959 nft_clear(trans->ctx.net, nft_trans_obj(trans));
4960 nft_trans_destroy(trans);
4967 list_for_each_entry_safe_reverse(trans, next,
4968 &net->nft.commit_list, list) {
4969 list_del(&trans->list);
4970 nf_tables_abort_release(trans);
4976 static bool nf_tables_valid_genid(struct net *net, u32 genid)
4978 return net->nft.base_seq == genid;
4981 static const struct nfnetlink_subsystem nf_tables_subsys = {
4982 .name = "nf_tables",
4983 .subsys_id = NFNL_SUBSYS_NFTABLES,
4984 .cb_count = NFT_MSG_MAX,
4986 .commit = nf_tables_commit,
4987 .abort = nf_tables_abort,
4988 .valid_genid = nf_tables_valid_genid,
4991 int nft_chain_validate_dependency(const struct nft_chain *chain,
4992 enum nft_chain_type type)
4994 const struct nft_base_chain *basechain;
4996 if (chain->flags & NFT_BASE_CHAIN) {
4997 basechain = nft_base_chain(chain);
4998 if (basechain->type->type != type)
5003 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
5005 int nft_chain_validate_hooks(const struct nft_chain *chain,
5006 unsigned int hook_flags)
5008 struct nft_base_chain *basechain;
5010 if (chain->flags & NFT_BASE_CHAIN) {
5011 basechain = nft_base_chain(chain);
5013 if ((1 << basechain->ops[0].hooknum) & hook_flags)
5021 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
5024 * Loop detection - walk through the ruleset beginning at the destination chain
5025 * of a new jump until either the source chain is reached (loop) or all
5026 * reachable chains have been traversed.
5028 * The loop check is performed whenever a new jump verdict is added to an
5029 * expression or verdict map or a verdict map is bound to a new chain.
5032 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5033 const struct nft_chain *chain);
5035 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
5036 struct nft_set *set,
5037 const struct nft_set_iter *iter,
5038 struct nft_set_elem *elem)
5040 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5041 const struct nft_data *data;
5043 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5044 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
5047 data = nft_set_ext_data(ext);
5048 switch (data->verdict.code) {
5051 return nf_tables_check_loops(ctx, data->verdict.chain);
5057 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5058 const struct nft_chain *chain)
5060 const struct nft_rule *rule;
5061 const struct nft_expr *expr, *last;
5062 struct nft_set *set;
5063 struct nft_set_binding *binding;
5064 struct nft_set_iter iter;
5066 if (ctx->chain == chain)
5069 list_for_each_entry(rule, &chain->rules, list) {
5070 nft_rule_for_each_expr(expr, last, rule) {
5071 const struct nft_data *data = NULL;
5074 if (!expr->ops->validate)
5077 err = expr->ops->validate(ctx, expr, &data);
5084 switch (data->verdict.code) {
5087 err = nf_tables_check_loops(ctx,
5088 data->verdict.chain);
5097 list_for_each_entry(set, &ctx->table->sets, list) {
5098 if (!nft_is_active_next(ctx->net, set))
5100 if (!(set->flags & NFT_SET_MAP) ||
5101 set->dtype != NFT_DATA_VERDICT)
5104 list_for_each_entry(binding, &set->bindings, list) {
5105 if (!(binding->flags & NFT_SET_MAP) ||
5106 binding->chain != chain)
5109 iter.genmask = nft_genmask_next(ctx->net);
5113 iter.fn = nf_tables_loop_check_setelem;
5115 set->ops->walk(ctx, set, &iter);
5125 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
5127 * @attr: netlink attribute to fetch value from
5128 * @max: maximum value to be stored in dest
5129 * @dest: pointer to the variable
5131 * Parse, check and store a given u32 netlink attribute into variable.
5132 * This function returns -ERANGE if the value goes over maximum value.
5133 * Otherwise a 0 is returned and the attribute value is stored in the
5134 * destination variable.
5136 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
5140 val = ntohl(nla_get_be32(attr));
5147 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
5150 * nft_parse_register - parse a register value from a netlink attribute
5152 * @attr: netlink attribute
5154 * Parse and translate a register value from a netlink attribute.
5155 * Registers used to be 128 bit wide, these register numbers will be
5156 * mapped to the corresponding 32 bit register numbers.
5158 unsigned int nft_parse_register(const struct nlattr *attr)
5162 reg = ntohl(nla_get_be32(attr));
5164 case NFT_REG_VERDICT...NFT_REG_4:
5165 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
5167 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
5170 EXPORT_SYMBOL_GPL(nft_parse_register);
5173 * nft_dump_register - dump a register value to a netlink attribute
5175 * @skb: socket buffer
5176 * @attr: attribute number
5177 * @reg: register number
5179 * Construct a netlink attribute containing the register number. For
5180 * compatibility reasons, register numbers being a multiple of 4 are
5181 * translated to the corresponding 128 bit register numbers.
5183 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
5185 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
5186 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
5188 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
5190 return nla_put_be32(skb, attr, htonl(reg));
5192 EXPORT_SYMBOL_GPL(nft_dump_register);
5195 * nft_validate_register_load - validate a load from a register
5197 * @reg: the register number
5198 * @len: the length of the data
5200 * Validate that the input register is one of the general purpose
5201 * registers and that the length of the load is within the bounds.
5203 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
5205 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5209 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
5214 EXPORT_SYMBOL_GPL(nft_validate_register_load);
5217 * nft_validate_register_store - validate an expressions' register store
5219 * @ctx: context of the expression performing the load
5220 * @reg: the destination register number
5221 * @data: the data to load
5222 * @type: the data type
5223 * @len: the length of the data
5225 * Validate that a data load uses the appropriate data type for
5226 * the destination register and the length is within the bounds.
5227 * A value of NULL for the data means that its runtime gathered
5230 int nft_validate_register_store(const struct nft_ctx *ctx,
5231 enum nft_registers reg,
5232 const struct nft_data *data,
5233 enum nft_data_types type, unsigned int len)
5238 case NFT_REG_VERDICT:
5239 if (type != NFT_DATA_VERDICT)
5243 (data->verdict.code == NFT_GOTO ||
5244 data->verdict.code == NFT_JUMP)) {
5245 err = nf_tables_check_loops(ctx, data->verdict.chain);
5249 if (ctx->chain->level + 1 >
5250 data->verdict.chain->level) {
5251 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
5253 data->verdict.chain->level = ctx->chain->level + 1;
5259 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5263 if (reg * NFT_REG32_SIZE + len >
5264 FIELD_SIZEOF(struct nft_regs, data))
5267 if (data != NULL && type != NFT_DATA_VALUE)
5272 EXPORT_SYMBOL_GPL(nft_validate_register_store);
5274 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
5275 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
5276 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
5277 .len = NFT_CHAIN_MAXNAMELEN - 1 },
5280 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
5281 struct nft_data_desc *desc, const struct nlattr *nla)
5283 u8 genmask = nft_genmask_next(ctx->net);
5284 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
5285 struct nft_chain *chain;
5288 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
5292 if (!tb[NFTA_VERDICT_CODE])
5294 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
5296 switch (data->verdict.code) {
5298 switch (data->verdict.code & NF_VERDICT_MASK) {
5313 if (!tb[NFTA_VERDICT_CHAIN])
5315 chain = nf_tables_chain_lookup(ctx->table,
5316 tb[NFTA_VERDICT_CHAIN], genmask);
5318 return PTR_ERR(chain);
5319 if (chain->flags & NFT_BASE_CHAIN)
5323 data->verdict.chain = chain;
5327 desc->len = sizeof(data->verdict);
5328 desc->type = NFT_DATA_VERDICT;
5332 static void nft_verdict_uninit(const struct nft_data *data)
5334 switch (data->verdict.code) {
5337 data->verdict.chain->use--;
5342 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
5344 struct nlattr *nest;
5346 nest = nla_nest_start(skb, type);
5348 goto nla_put_failure;
5350 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
5351 goto nla_put_failure;
5356 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
5358 goto nla_put_failure;
5360 nla_nest_end(skb, nest);
5367 static int nft_value_init(const struct nft_ctx *ctx,
5368 struct nft_data *data, unsigned int size,
5369 struct nft_data_desc *desc, const struct nlattr *nla)
5379 nla_memcpy(data->data, nla, len);
5380 desc->type = NFT_DATA_VALUE;
5385 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
5388 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
5391 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
5392 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
5393 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
5397 * nft_data_init - parse nf_tables data netlink attributes
5399 * @ctx: context of the expression using the data
5400 * @data: destination struct nft_data
5401 * @size: maximum data length
5402 * @desc: data description
5403 * @nla: netlink attribute containing data
5405 * Parse the netlink data attributes and initialize a struct nft_data.
5406 * The type and length of data are returned in the data description.
5408 * The caller can indicate that it only wants to accept data of type
5409 * NFT_DATA_VALUE by passing NULL for the ctx argument.
5411 int nft_data_init(const struct nft_ctx *ctx,
5412 struct nft_data *data, unsigned int size,
5413 struct nft_data_desc *desc, const struct nlattr *nla)
5415 struct nlattr *tb[NFTA_DATA_MAX + 1];
5418 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
5422 if (tb[NFTA_DATA_VALUE])
5423 return nft_value_init(ctx, data, size, desc,
5424 tb[NFTA_DATA_VALUE]);
5425 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
5426 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
5429 EXPORT_SYMBOL_GPL(nft_data_init);
5432 * nft_data_uninit - release a nft_data item
5434 * @data: struct nft_data to release
5435 * @type: type of data
5437 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5438 * all others need to be released by calling this function.
5440 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
5442 if (type < NFT_DATA_VERDICT)
5445 case NFT_DATA_VERDICT:
5446 return nft_verdict_uninit(data);
5451 EXPORT_SYMBOL_GPL(nft_data_uninit);
5453 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
5454 enum nft_data_types type, unsigned int len)
5456 struct nlattr *nest;
5459 nest = nla_nest_start(skb, attr);
5464 case NFT_DATA_VALUE:
5465 err = nft_value_dump(skb, data, len);
5467 case NFT_DATA_VERDICT:
5468 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
5475 nla_nest_end(skb, nest);
5478 EXPORT_SYMBOL_GPL(nft_data_dump);
5480 static int __net_init nf_tables_init_net(struct net *net)
5482 INIT_LIST_HEAD(&net->nft.af_info);
5483 INIT_LIST_HEAD(&net->nft.commit_list);
5484 net->nft.base_seq = 1;
5488 int __nft_release_basechain(struct nft_ctx *ctx)
5490 struct nft_rule *rule, *nr;
5492 BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
5494 nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
5496 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
5497 list_del(&rule->list);
5499 nf_tables_rule_destroy(ctx, rule);
5501 list_del(&ctx->chain->list);
5503 nf_tables_chain_destroy(ctx->chain);
5507 EXPORT_SYMBOL_GPL(__nft_release_basechain);
5509 /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
5510 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
5512 struct nft_table *table, *nt;
5513 struct nft_chain *chain, *nc;
5514 struct nft_object *obj, *ne;
5515 struct nft_rule *rule, *nr;
5516 struct nft_set *set, *ns;
5517 struct nft_ctx ctx = {
5522 list_for_each_entry_safe(table, nt, &afi->tables, list) {
5523 list_for_each_entry(chain, &table->chains, list)
5524 nf_tables_unregister_hooks(net, table, chain,
5526 /* No packets are walking on these chains anymore. */
5528 list_for_each_entry(chain, &table->chains, list) {
5530 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
5531 list_del(&rule->list);
5533 nf_tables_rule_destroy(&ctx, rule);
5536 list_for_each_entry_safe(set, ns, &table->sets, list) {
5537 list_del(&set->list);
5539 nft_set_destroy(set);
5541 list_for_each_entry_safe(obj, ne, &table->objects, list) {
5542 list_del(&obj->list);
5544 nft_obj_destroy(obj);
5546 list_for_each_entry_safe(chain, nc, &table->chains, list) {
5547 list_del(&chain->list);
5549 nf_tables_chain_destroy(chain);
5551 list_del(&table->list);
5552 nf_tables_table_destroy(&ctx);
5556 static struct pernet_operations nf_tables_net_ops = {
5557 .init = nf_tables_init_net,
5560 static int __init nf_tables_module_init(void)
5564 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
5571 err = nf_tables_core_module_init();
5575 err = nfnetlink_subsys_register(&nf_tables_subsys);
5579 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
5580 return register_pernet_subsys(&nf_tables_net_ops);
5582 nf_tables_core_module_exit();
5589 static void __exit nf_tables_module_exit(void)
5591 unregister_pernet_subsys(&nf_tables_net_ops);
5592 nfnetlink_subsys_unregister(&nf_tables_subsys);
5594 nf_tables_core_module_exit();
5598 module_init(nf_tables_module_init);
5599 module_exit(nf_tables_module_exit);
5601 MODULE_LICENSE("GPL");
5602 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
5603 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);