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);
1775 if (ops->validate) {
1776 const struct nft_data *data = NULL;
1778 err = ops->validate(ctx, expr, &data);
1787 ops->destroy(ctx, expr);
1793 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1794 struct nft_expr *expr)
1796 if (expr->ops->destroy)
1797 expr->ops->destroy(ctx, expr);
1798 module_put(expr->ops->type->owner);
1801 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1802 const struct nlattr *nla)
1804 struct nft_expr_info info;
1805 struct nft_expr *expr;
1808 err = nf_tables_expr_parse(ctx, nla, &info);
1813 expr = kzalloc(info.ops->size, GFP_KERNEL);
1817 err = nf_tables_newexpr(ctx, &info, expr);
1825 module_put(info.ops->type->owner);
1827 return ERR_PTR(err);
1830 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1832 nf_tables_expr_destroy(ctx, expr);
1840 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1843 struct nft_rule *rule;
1845 // FIXME: this sucks
1846 list_for_each_entry(rule, &chain->rules, list) {
1847 if (handle == rule->handle)
1851 return ERR_PTR(-ENOENT);
1854 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1855 const struct nlattr *nla)
1858 return ERR_PTR(-EINVAL);
1860 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1863 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1864 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
1865 .len = NFT_TABLE_MAXNAMELEN - 1 },
1866 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1867 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1868 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1869 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1870 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1871 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1872 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1873 .len = NFT_USERDATA_MAXLEN },
1876 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1877 u32 portid, u32 seq, int event,
1878 u32 flags, int family,
1879 const struct nft_table *table,
1880 const struct nft_chain *chain,
1881 const struct nft_rule *rule)
1883 struct nlmsghdr *nlh;
1884 struct nfgenmsg *nfmsg;
1885 const struct nft_expr *expr, *next;
1886 struct nlattr *list;
1887 const struct nft_rule *prule;
1888 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1890 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1893 goto nla_put_failure;
1895 nfmsg = nlmsg_data(nlh);
1896 nfmsg->nfgen_family = family;
1897 nfmsg->version = NFNETLINK_V0;
1898 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1900 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1901 goto nla_put_failure;
1902 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1903 goto nla_put_failure;
1904 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1906 goto nla_put_failure;
1908 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1909 prule = list_entry(rule->list.prev, struct nft_rule, list);
1910 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1911 cpu_to_be64(prule->handle),
1913 goto nla_put_failure;
1916 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1918 goto nla_put_failure;
1919 nft_rule_for_each_expr(expr, next, rule) {
1920 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
1921 goto nla_put_failure;
1923 nla_nest_end(skb, list);
1926 struct nft_userdata *udata = nft_userdata(rule);
1927 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1929 goto nla_put_failure;
1932 nlmsg_end(skb, nlh);
1936 nlmsg_trim(skb, nlh);
1940 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
1941 const struct nft_rule *rule, int event)
1943 struct sk_buff *skb;
1947 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1950 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1954 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1955 event, 0, ctx->afi->family, ctx->table,
1962 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1963 ctx->report, GFP_KERNEL);
1966 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1969 struct nft_rule_dump_ctx {
1970 char table[NFT_TABLE_MAXNAMELEN];
1971 char chain[NFT_CHAIN_MAXNAMELEN];
1974 static int nf_tables_dump_rules(struct sk_buff *skb,
1975 struct netlink_callback *cb)
1977 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1978 const struct nft_rule_dump_ctx *ctx = cb->data;
1979 const struct nft_af_info *afi;
1980 const struct nft_table *table;
1981 const struct nft_chain *chain;
1982 const struct nft_rule *rule;
1983 unsigned int idx = 0, s_idx = cb->args[0];
1984 struct net *net = sock_net(skb->sk);
1985 int family = nfmsg->nfgen_family;
1988 cb->seq = net->nft.base_seq;
1990 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1991 if (family != NFPROTO_UNSPEC && family != afi->family)
1994 list_for_each_entry_rcu(table, &afi->tables, list) {
1995 if (ctx && ctx->table[0] &&
1996 strcmp(ctx->table, table->name) != 0)
1999 list_for_each_entry_rcu(chain, &table->chains, list) {
2000 if (ctx && ctx->chain[0] &&
2001 strcmp(ctx->chain, chain->name) != 0)
2004 list_for_each_entry_rcu(rule, &chain->rules, list) {
2005 if (!nft_is_active(net, rule))
2010 memset(&cb->args[1], 0,
2011 sizeof(cb->args) - sizeof(cb->args[0]));
2012 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2015 NLM_F_MULTI | NLM_F_APPEND,
2016 afi->family, table, chain, rule) < 0)
2019 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2033 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2039 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2040 struct sk_buff *skb, const struct nlmsghdr *nlh,
2041 const struct nlattr * const nla[])
2043 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2044 u8 genmask = nft_genmask_cur(net);
2045 const struct nft_af_info *afi;
2046 const struct nft_table *table;
2047 const struct nft_chain *chain;
2048 const struct nft_rule *rule;
2049 struct sk_buff *skb2;
2050 int family = nfmsg->nfgen_family;
2053 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2054 struct netlink_dump_control c = {
2055 .dump = nf_tables_dump_rules,
2056 .done = nf_tables_dump_rules_done,
2059 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2060 struct nft_rule_dump_ctx *ctx;
2062 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
2066 if (nla[NFTA_RULE_TABLE])
2067 nla_strlcpy(ctx->table, nla[NFTA_RULE_TABLE],
2068 sizeof(ctx->table));
2069 if (nla[NFTA_RULE_CHAIN])
2070 nla_strlcpy(ctx->chain, nla[NFTA_RULE_CHAIN],
2071 sizeof(ctx->chain));
2075 return netlink_dump_start(nlsk, skb, nlh, &c);
2078 afi = nf_tables_afinfo_lookup(net, family, false);
2080 return PTR_ERR(afi);
2082 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2084 return PTR_ERR(table);
2086 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2088 return PTR_ERR(chain);
2090 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2092 return PTR_ERR(rule);
2094 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2098 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2099 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2100 family, table, chain, rule);
2104 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2111 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2112 struct nft_rule *rule)
2114 struct nft_expr *expr;
2117 * Careful: some expressions might not be initialized in case this
2118 * is called on error from nf_tables_newrule().
2120 expr = nft_expr_first(rule);
2121 while (expr != nft_expr_last(rule) && expr->ops) {
2122 nf_tables_expr_destroy(ctx, expr);
2123 expr = nft_expr_next(expr);
2128 #define NFT_RULE_MAXEXPRS 128
2130 static struct nft_expr_info *info;
2132 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2133 struct sk_buff *skb, const struct nlmsghdr *nlh,
2134 const struct nlattr * const nla[])
2136 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2137 u8 genmask = nft_genmask_next(net);
2138 struct nft_af_info *afi;
2139 struct nft_table *table;
2140 struct nft_chain *chain;
2141 struct nft_rule *rule, *old_rule = NULL;
2142 struct nft_userdata *udata;
2143 struct nft_trans *trans = NULL;
2144 struct nft_expr *expr;
2147 unsigned int size, i, n, ulen = 0, usize = 0;
2150 u64 handle, pos_handle;
2152 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2154 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2156 return PTR_ERR(afi);
2158 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2160 return PTR_ERR(table);
2162 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2164 return PTR_ERR(chain);
2166 if (nla[NFTA_RULE_HANDLE]) {
2167 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2168 rule = __nf_tables_rule_lookup(chain, handle);
2170 return PTR_ERR(rule);
2172 if (nlh->nlmsg_flags & NLM_F_EXCL)
2174 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2179 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2181 handle = nf_tables_alloc_handle(table);
2183 if (chain->use == UINT_MAX)
2187 if (nla[NFTA_RULE_POSITION]) {
2188 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2191 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2192 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2193 if (IS_ERR(old_rule))
2194 return PTR_ERR(old_rule);
2197 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2201 if (nla[NFTA_RULE_EXPRESSIONS]) {
2202 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2204 if (nla_type(tmp) != NFTA_LIST_ELEM)
2206 if (n == NFT_RULE_MAXEXPRS)
2208 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2211 size += info[n].ops->size;
2215 /* Check for overflow of dlen field */
2217 if (size >= 1 << 12)
2220 if (nla[NFTA_RULE_USERDATA]) {
2221 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2223 usize = sizeof(struct nft_userdata) + ulen;
2227 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2231 nft_activate_next(net, rule);
2233 rule->handle = handle;
2235 rule->udata = ulen ? 1 : 0;
2238 udata = nft_userdata(rule);
2239 udata->len = ulen - 1;
2240 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2243 expr = nft_expr_first(rule);
2244 for (i = 0; i < n; i++) {
2245 err = nf_tables_newexpr(&ctx, &info[i], expr);
2249 expr = nft_expr_next(expr);
2252 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2253 if (nft_is_active_next(net, old_rule)) {
2254 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2256 if (trans == NULL) {
2260 nft_deactivate_next(net, old_rule);
2262 list_add_tail_rcu(&rule->list, &old_rule->list);
2267 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2269 list_add_rcu(&rule->list, &old_rule->list);
2271 list_add_tail_rcu(&rule->list, &chain->rules);
2274 list_add_tail_rcu(&rule->list, &old_rule->list);
2276 list_add_rcu(&rule->list, &chain->rules);
2279 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2287 list_del_rcu(&rule->list);
2289 nf_tables_rule_destroy(&ctx, rule);
2291 for (i = 0; i < n; i++) {
2292 if (info[i].ops != NULL)
2293 module_put(info[i].ops->type->owner);
2298 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2299 const struct nlattr *nla)
2301 u32 id = ntohl(nla_get_be32(nla));
2302 struct nft_trans *trans;
2304 list_for_each_entry(trans, &net->nft.commit_list, list) {
2305 struct nft_rule *rule = nft_trans_rule(trans);
2307 if (trans->msg_type == NFT_MSG_NEWRULE &&
2308 id == nft_trans_rule_id(trans))
2311 return ERR_PTR(-ENOENT);
2314 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2315 struct sk_buff *skb, const struct nlmsghdr *nlh,
2316 const struct nlattr * const nla[])
2318 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2319 u8 genmask = nft_genmask_next(net);
2320 struct nft_af_info *afi;
2321 struct nft_table *table;
2322 struct nft_chain *chain = NULL;
2323 struct nft_rule *rule;
2324 int family = nfmsg->nfgen_family, err = 0;
2327 afi = nf_tables_afinfo_lookup(net, family, false);
2329 return PTR_ERR(afi);
2331 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2333 return PTR_ERR(table);
2335 if (nla[NFTA_RULE_CHAIN]) {
2336 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2339 return PTR_ERR(chain);
2342 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2345 if (nla[NFTA_RULE_HANDLE]) {
2346 rule = nf_tables_rule_lookup(chain,
2347 nla[NFTA_RULE_HANDLE]);
2349 return PTR_ERR(rule);
2351 err = nft_delrule(&ctx, rule);
2352 } else if (nla[NFTA_RULE_ID]) {
2353 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2355 return PTR_ERR(rule);
2357 err = nft_delrule(&ctx, rule);
2359 err = nft_delrule_by_chain(&ctx);
2362 list_for_each_entry(chain, &table->chains, list) {
2363 if (!nft_is_active_next(net, chain))
2367 err = nft_delrule_by_chain(&ctx);
2380 static LIST_HEAD(nf_tables_set_ops);
2382 int nft_register_set(struct nft_set_ops *ops)
2384 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2385 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2386 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2389 EXPORT_SYMBOL_GPL(nft_register_set);
2391 void nft_unregister_set(struct nft_set_ops *ops)
2393 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2394 list_del_rcu(&ops->list);
2395 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2397 EXPORT_SYMBOL_GPL(nft_unregister_set);
2400 * Select a set implementation based on the data characteristics and the
2401 * given policy. The total memory use might not be known if no size is
2402 * given, in that case the amount of memory per element is used.
2404 static const struct nft_set_ops *
2405 nft_select_set_ops(const struct nlattr * const nla[],
2406 const struct nft_set_desc *desc,
2407 enum nft_set_policies policy)
2409 const struct nft_set_ops *ops, *bops;
2410 struct nft_set_estimate est, best;
2413 #ifdef CONFIG_MODULES
2414 if (list_empty(&nf_tables_set_ops)) {
2415 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2416 request_module("nft-set");
2417 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2418 if (!list_empty(&nf_tables_set_ops))
2419 return ERR_PTR(-EAGAIN);
2423 if (nla[NFTA_SET_FLAGS] != NULL) {
2424 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2425 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT |
2434 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2435 if ((ops->features & features) != features)
2437 if (!ops->estimate(desc, features, &est))
2441 case NFT_SET_POL_PERFORMANCE:
2442 if (est.lookup < best.lookup)
2444 if (est.lookup == best.lookup) {
2446 if (est.space < best.space)
2448 } else if (est.size < best.size) {
2453 case NFT_SET_POL_MEMORY:
2455 if (est.space < best.space)
2457 if (est.space == best.space &&
2458 est.lookup < best.lookup)
2460 } else if (est.size < best.size) {
2468 if (!try_module_get(ops->owner))
2471 module_put(bops->owner);
2480 return ERR_PTR(-EOPNOTSUPP);
2483 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2484 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2485 .len = NFT_TABLE_MAXNAMELEN - 1 },
2486 [NFTA_SET_NAME] = { .type = NLA_STRING,
2487 .len = NFT_SET_MAXNAMELEN - 1 },
2488 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2489 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2490 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2491 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2492 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2493 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2494 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2495 [NFTA_SET_ID] = { .type = NLA_U32 },
2496 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2497 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2498 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2499 .len = NFT_USERDATA_MAXLEN },
2500 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
2503 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2504 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2507 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2508 const struct sk_buff *skb,
2509 const struct nlmsghdr *nlh,
2510 const struct nlattr * const nla[],
2513 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2514 struct nft_af_info *afi = NULL;
2515 struct nft_table *table = NULL;
2517 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2518 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2520 return PTR_ERR(afi);
2523 if (nla[NFTA_SET_TABLE] != NULL) {
2525 return -EAFNOSUPPORT;
2527 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2530 return PTR_ERR(table);
2533 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
2537 static struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2538 const struct nlattr *nla, u8 genmask)
2540 struct nft_set *set;
2543 return ERR_PTR(-EINVAL);
2545 list_for_each_entry(set, &table->sets, list) {
2546 if (!nla_strcmp(nla, set->name) &&
2547 nft_active_genmask(set, genmask))
2550 return ERR_PTR(-ENOENT);
2553 static struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2554 const struct nlattr *nla,
2557 struct nft_trans *trans;
2558 u32 id = ntohl(nla_get_be32(nla));
2560 list_for_each_entry(trans, &net->nft.commit_list, list) {
2561 struct nft_set *set = nft_trans_set(trans);
2563 if (trans->msg_type == NFT_MSG_NEWSET &&
2564 id == nft_trans_set_id(trans) &&
2565 nft_active_genmask(set, genmask))
2568 return ERR_PTR(-ENOENT);
2571 struct nft_set *nft_set_lookup(const struct net *net,
2572 const struct nft_table *table,
2573 const struct nlattr *nla_set_name,
2574 const struct nlattr *nla_set_id,
2577 struct nft_set *set;
2579 set = nf_tables_set_lookup(table, nla_set_name, genmask);
2584 set = nf_tables_set_lookup_byid(net, nla_set_id, genmask);
2588 EXPORT_SYMBOL_GPL(nft_set_lookup);
2590 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2593 const struct nft_set *i;
2595 unsigned long *inuse;
2596 unsigned int n = 0, min = 0;
2598 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
2600 if (p[1] != 'd' || strchr(p + 2, '%'))
2603 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2607 list_for_each_entry(i, &ctx->table->sets, list) {
2610 if (!nft_is_active_next(ctx->net, set))
2612 if (!sscanf(i->name, name, &tmp))
2614 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2617 set_bit(tmp - min, inuse);
2620 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2621 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2622 min += BITS_PER_BYTE * PAGE_SIZE;
2623 memset(inuse, 0, PAGE_SIZE);
2626 free_page((unsigned long)inuse);
2629 snprintf(set->name, sizeof(set->name), name, min + n);
2630 list_for_each_entry(i, &ctx->table->sets, list) {
2631 if (!nft_is_active_next(ctx->net, i))
2633 if (!strcmp(set->name, i->name))
2639 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2640 const struct nft_set *set, u16 event, u16 flags)
2642 struct nfgenmsg *nfmsg;
2643 struct nlmsghdr *nlh;
2644 struct nlattr *desc;
2645 u32 portid = ctx->portid;
2648 event |= NFNL_SUBSYS_NFTABLES << 8;
2649 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2652 goto nla_put_failure;
2654 nfmsg = nlmsg_data(nlh);
2655 nfmsg->nfgen_family = ctx->afi->family;
2656 nfmsg->version = NFNETLINK_V0;
2657 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2659 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2660 goto nla_put_failure;
2661 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2662 goto nla_put_failure;
2663 if (set->flags != 0)
2664 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2665 goto nla_put_failure;
2667 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2668 goto nla_put_failure;
2669 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2670 goto nla_put_failure;
2671 if (set->flags & NFT_SET_MAP) {
2672 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2673 goto nla_put_failure;
2674 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2675 goto nla_put_failure;
2677 if (set->flags & NFT_SET_OBJECT &&
2678 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
2679 goto nla_put_failure;
2682 nla_put_be64(skb, NFTA_SET_TIMEOUT,
2683 cpu_to_be64(jiffies_to_msecs(set->timeout)),
2685 goto nla_put_failure;
2687 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2688 goto nla_put_failure;
2690 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2691 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2692 goto nla_put_failure;
2695 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2696 goto nla_put_failure;
2698 desc = nla_nest_start(skb, NFTA_SET_DESC);
2700 goto nla_put_failure;
2702 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2703 goto nla_put_failure;
2704 nla_nest_end(skb, desc);
2706 nlmsg_end(skb, nlh);
2710 nlmsg_trim(skb, nlh);
2714 static void nf_tables_set_notify(const struct nft_ctx *ctx,
2715 const struct nft_set *set, int event,
2718 struct sk_buff *skb;
2719 u32 portid = ctx->portid;
2723 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2726 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2730 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2736 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
2740 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
2743 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2745 const struct nft_set *set;
2746 unsigned int idx, s_idx = cb->args[0];
2747 struct nft_af_info *afi;
2748 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2749 struct net *net = sock_net(skb->sk);
2750 int cur_family = cb->args[3];
2751 struct nft_ctx *ctx = cb->data, ctx_set;
2757 cb->seq = net->nft.base_seq;
2759 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2760 if (ctx->afi && ctx->afi != afi)
2764 if (afi->family != cur_family)
2769 list_for_each_entry_rcu(table, &afi->tables, list) {
2770 if (ctx->table && ctx->table != table)
2774 if (cur_table != table)
2780 list_for_each_entry_rcu(set, &table->sets, list) {
2783 if (!nft_is_active(net, set))
2787 ctx_set.table = table;
2789 if (nf_tables_fill_set(skb, &ctx_set, set,
2793 cb->args[2] = (unsigned long) table;
2794 cb->args[3] = afi->family;
2797 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2811 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2817 static int nf_tables_getset(struct net *net, struct sock *nlsk,
2818 struct sk_buff *skb, const struct nlmsghdr *nlh,
2819 const struct nlattr * const nla[])
2821 u8 genmask = nft_genmask_cur(net);
2822 const struct nft_set *set;
2824 struct sk_buff *skb2;
2825 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2828 /* Verify existence before starting dump */
2829 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
2833 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2834 struct netlink_dump_control c = {
2835 .dump = nf_tables_dump_sets,
2836 .done = nf_tables_dump_sets_done,
2838 struct nft_ctx *ctx_dump;
2840 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2841 if (ctx_dump == NULL)
2847 return netlink_dump_start(nlsk, skb, nlh, &c);
2850 /* Only accept unspec with dump */
2851 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2852 return -EAFNOSUPPORT;
2853 if (!nla[NFTA_SET_TABLE])
2856 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
2858 return PTR_ERR(set);
2860 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2864 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2868 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2875 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2876 struct nft_set_desc *desc,
2877 const struct nlattr *nla)
2879 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2882 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2886 if (da[NFTA_SET_DESC_SIZE] != NULL)
2887 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2892 static int nf_tables_newset(struct net *net, struct sock *nlsk,
2893 struct sk_buff *skb, const struct nlmsghdr *nlh,
2894 const struct nlattr * const nla[])
2896 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2897 u8 genmask = nft_genmask_next(net);
2898 const struct nft_set_ops *ops;
2899 struct nft_af_info *afi;
2900 struct nft_table *table;
2901 struct nft_set *set;
2903 char name[NFT_SET_MAXNAMELEN];
2907 u32 ktype, dtype, flags, policy, gc_int, objtype;
2908 struct nft_set_desc desc;
2909 unsigned char *udata;
2913 if (nla[NFTA_SET_TABLE] == NULL ||
2914 nla[NFTA_SET_NAME] == NULL ||
2915 nla[NFTA_SET_KEY_LEN] == NULL ||
2916 nla[NFTA_SET_ID] == NULL)
2919 memset(&desc, 0, sizeof(desc));
2921 ktype = NFT_DATA_VALUE;
2922 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2923 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2924 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2928 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2929 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
2933 if (nla[NFTA_SET_FLAGS] != NULL) {
2934 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2935 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2936 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2937 NFT_SET_MAP | NFT_SET_EVAL |
2940 /* Only one of these operations is supported */
2941 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
2942 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
2947 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2948 if (!(flags & NFT_SET_MAP))
2951 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2952 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2953 dtype != NFT_DATA_VERDICT)
2956 if (dtype != NFT_DATA_VERDICT) {
2957 if (nla[NFTA_SET_DATA_LEN] == NULL)
2959 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2960 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
2963 desc.dlen = sizeof(struct nft_verdict);
2964 } else if (flags & NFT_SET_MAP)
2967 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
2968 if (!(flags & NFT_SET_OBJECT))
2971 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
2972 if (objtype == NFT_OBJECT_UNSPEC ||
2973 objtype > NFT_OBJECT_MAX)
2975 } else if (flags & NFT_SET_OBJECT)
2978 objtype = NFT_OBJECT_UNSPEC;
2981 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2982 if (!(flags & NFT_SET_TIMEOUT))
2984 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
2985 nla[NFTA_SET_TIMEOUT])));
2988 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2989 if (!(flags & NFT_SET_TIMEOUT))
2991 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2994 policy = NFT_SET_POL_PERFORMANCE;
2995 if (nla[NFTA_SET_POLICY] != NULL)
2996 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2998 if (nla[NFTA_SET_DESC] != NULL) {
2999 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
3004 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
3006 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
3008 return PTR_ERR(afi);
3010 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
3012 return PTR_ERR(table);
3014 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
3016 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
3018 if (PTR_ERR(set) != -ENOENT)
3019 return PTR_ERR(set);
3021 if (nlh->nlmsg_flags & NLM_F_EXCL)
3023 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3028 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3031 ops = nft_select_set_ops(nla, &desc, policy);
3033 return PTR_ERR(ops);
3036 if (nla[NFTA_SET_USERDATA])
3037 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3040 if (ops->privsize != NULL)
3041 size = ops->privsize(nla);
3044 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3048 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
3049 err = nf_tables_set_alloc_name(&ctx, set, name);
3055 udata = set->data + size;
3056 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3059 INIT_LIST_HEAD(&set->bindings);
3062 set->klen = desc.klen;
3064 set->objtype = objtype;
3065 set->dlen = desc.dlen;
3067 set->size = desc.size;
3068 set->policy = policy;
3071 set->timeout = timeout;
3072 set->gc_int = gc_int;
3074 err = ops->init(set, &desc, nla);
3078 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3082 list_add_tail_rcu(&set->list, &table->sets);
3091 module_put(ops->owner);
3095 static void nft_set_destroy(struct nft_set *set)
3097 set->ops->destroy(set);
3098 module_put(set->ops->owner);
3102 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3104 list_del_rcu(&set->list);
3105 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
3106 nft_set_destroy(set);
3109 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3110 struct sk_buff *skb, const struct nlmsghdr *nlh,
3111 const struct nlattr * const nla[])
3113 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3114 u8 genmask = nft_genmask_next(net);
3115 struct nft_set *set;
3119 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3120 return -EAFNOSUPPORT;
3121 if (nla[NFTA_SET_TABLE] == NULL)
3124 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
3128 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3130 return PTR_ERR(set);
3131 if (!list_empty(&set->bindings))
3134 return nft_delset(&ctx, set);
3137 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3138 struct nft_set *set,
3139 const struct nft_set_iter *iter,
3140 struct nft_set_elem *elem)
3142 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3143 enum nft_registers dreg;
3145 dreg = nft_type_to_reg(set->dtype);
3146 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3147 set->dtype == NFT_DATA_VERDICT ?
3148 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3152 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3153 struct nft_set_binding *binding)
3155 struct nft_set_binding *i;
3156 struct nft_set_iter iter;
3158 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
3161 if (binding->flags & NFT_SET_MAP) {
3162 /* If the set is already bound to the same chain all
3163 * jumps are already validated for that chain.
3165 list_for_each_entry(i, &set->bindings, list) {
3166 if (i->flags & NFT_SET_MAP &&
3167 i->chain == binding->chain)
3171 iter.genmask = nft_genmask_next(ctx->net);
3175 iter.fn = nf_tables_bind_check_setelem;
3177 set->ops->walk(ctx, set, &iter);
3182 binding->chain = ctx->chain;
3183 list_add_tail_rcu(&binding->list, &set->bindings);
3186 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3188 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3189 struct nft_set_binding *binding)
3191 list_del_rcu(&binding->list);
3193 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
3194 nft_is_active(ctx->net, set))
3195 nf_tables_set_destroy(ctx, set);
3197 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3199 const struct nft_set_ext_type nft_set_ext_types[] = {
3200 [NFT_SET_EXT_KEY] = {
3201 .align = __alignof__(u32),
3203 [NFT_SET_EXT_DATA] = {
3204 .align = __alignof__(u32),
3206 [NFT_SET_EXT_EXPR] = {
3207 .align = __alignof__(struct nft_expr),
3209 [NFT_SET_EXT_OBJREF] = {
3210 .len = sizeof(struct nft_object *),
3211 .align = __alignof__(struct nft_object *),
3213 [NFT_SET_EXT_FLAGS] = {
3215 .align = __alignof__(u8),
3217 [NFT_SET_EXT_TIMEOUT] = {
3219 .align = __alignof__(u64),
3221 [NFT_SET_EXT_EXPIRATION] = {
3222 .len = sizeof(unsigned long),
3223 .align = __alignof__(unsigned long),
3225 [NFT_SET_EXT_USERDATA] = {
3226 .len = sizeof(struct nft_userdata),
3227 .align = __alignof__(struct nft_userdata),
3230 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3236 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3237 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3238 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3239 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3240 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3241 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3242 .len = NFT_USERDATA_MAXLEN },
3245 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3246 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3247 .len = NFT_TABLE_MAXNAMELEN - 1 },
3248 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3249 .len = NFT_SET_MAXNAMELEN - 1 },
3250 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3251 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3254 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3255 const struct sk_buff *skb,
3256 const struct nlmsghdr *nlh,
3257 const struct nlattr * const nla[],
3260 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3261 struct nft_af_info *afi;
3262 struct nft_table *table;
3264 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3266 return PTR_ERR(afi);
3268 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3271 return PTR_ERR(table);
3273 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
3277 static int nf_tables_fill_setelem(struct sk_buff *skb,
3278 const struct nft_set *set,
3279 const struct nft_set_elem *elem)
3281 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3282 unsigned char *b = skb_tail_pointer(skb);
3283 struct nlattr *nest;
3285 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3287 goto nla_put_failure;
3289 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3290 NFT_DATA_VALUE, set->klen) < 0)
3291 goto nla_put_failure;
3293 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3294 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3295 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3297 goto nla_put_failure;
3299 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3300 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3301 goto nla_put_failure;
3303 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3304 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3305 (*nft_set_ext_obj(ext))->name) < 0)
3306 goto nla_put_failure;
3308 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3309 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3310 htonl(*nft_set_ext_flags(ext))))
3311 goto nla_put_failure;
3313 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3314 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3315 cpu_to_be64(jiffies_to_msecs(
3316 *nft_set_ext_timeout(ext))),
3318 goto nla_put_failure;
3320 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3321 unsigned long expires, now = jiffies;
3323 expires = *nft_set_ext_expiration(ext);
3324 if (time_before(now, expires))
3329 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3330 cpu_to_be64(jiffies_to_msecs(expires)),
3332 goto nla_put_failure;
3335 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3336 struct nft_userdata *udata;
3338 udata = nft_set_ext_userdata(ext);
3339 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3340 udata->len + 1, udata->data))
3341 goto nla_put_failure;
3344 nla_nest_end(skb, nest);
3352 struct nft_set_dump_args {
3353 const struct netlink_callback *cb;
3354 struct nft_set_iter iter;
3355 struct sk_buff *skb;
3358 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3359 struct nft_set *set,
3360 const struct nft_set_iter *iter,
3361 struct nft_set_elem *elem)
3363 struct nft_set_dump_args *args;
3365 args = container_of(iter, struct nft_set_dump_args, iter);
3366 return nf_tables_fill_setelem(args->skb, set, elem);
3369 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3371 struct net *net = sock_net(skb->sk);
3372 u8 genmask = nft_genmask_cur(net);
3373 struct nft_set *set;
3374 struct nft_set_dump_args args;
3376 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3377 struct nfgenmsg *nfmsg;
3378 struct nlmsghdr *nlh;
3379 struct nlattr *nest;
3383 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3384 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
3388 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
3389 (void *)nla, genmask);
3393 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3396 return PTR_ERR(set);
3398 event = NFT_MSG_NEWSETELEM;
3399 event |= NFNL_SUBSYS_NFTABLES << 8;
3400 portid = NETLINK_CB(cb->skb).portid;
3401 seq = cb->nlh->nlmsg_seq;
3403 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3406 goto nla_put_failure;
3408 nfmsg = nlmsg_data(nlh);
3409 nfmsg->nfgen_family = ctx.afi->family;
3410 nfmsg->version = NFNETLINK_V0;
3411 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
3413 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3414 goto nla_put_failure;
3415 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3416 goto nla_put_failure;
3418 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3420 goto nla_put_failure;
3424 args.iter.genmask = nft_genmask_cur(ctx.net);
3425 args.iter.skip = cb->args[0];
3426 args.iter.count = 0;
3428 args.iter.fn = nf_tables_dump_setelem;
3429 set->ops->walk(&ctx, set, &args.iter);
3431 nla_nest_end(skb, nest);
3432 nlmsg_end(skb, nlh);
3434 if (args.iter.err && args.iter.err != -EMSGSIZE)
3435 return args.iter.err;
3436 if (args.iter.count == cb->args[0])
3439 cb->args[0] = args.iter.count;
3446 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3447 struct sk_buff *skb, const struct nlmsghdr *nlh,
3448 const struct nlattr * const nla[])
3450 u8 genmask = nft_genmask_cur(net);
3451 const struct nft_set *set;
3455 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3459 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3462 return PTR_ERR(set);
3464 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3465 struct netlink_dump_control c = {
3466 .dump = nf_tables_dump_set,
3468 return netlink_dump_start(nlsk, skb, nlh, &c);
3473 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3474 const struct nft_ctx *ctx, u32 seq,
3475 u32 portid, int event, u16 flags,
3476 const struct nft_set *set,
3477 const struct nft_set_elem *elem)
3479 struct nfgenmsg *nfmsg;
3480 struct nlmsghdr *nlh;
3481 struct nlattr *nest;
3484 event |= NFNL_SUBSYS_NFTABLES << 8;
3485 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3488 goto nla_put_failure;
3490 nfmsg = nlmsg_data(nlh);
3491 nfmsg->nfgen_family = ctx->afi->family;
3492 nfmsg->version = NFNETLINK_V0;
3493 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3495 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3496 goto nla_put_failure;
3497 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3498 goto nla_put_failure;
3500 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3502 goto nla_put_failure;
3504 err = nf_tables_fill_setelem(skb, set, elem);
3506 goto nla_put_failure;
3508 nla_nest_end(skb, nest);
3510 nlmsg_end(skb, nlh);
3514 nlmsg_trim(skb, nlh);
3518 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
3519 const struct nft_set *set,
3520 const struct nft_set_elem *elem,
3521 int event, u16 flags)
3523 struct net *net = ctx->net;
3524 u32 portid = ctx->portid;
3525 struct sk_buff *skb;
3528 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3531 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3535 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3542 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3546 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3549 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3551 struct nft_set *set)
3553 struct nft_trans *trans;
3555 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3559 nft_trans_elem_set(trans) = set;
3563 void *nft_set_elem_init(const struct nft_set *set,
3564 const struct nft_set_ext_tmpl *tmpl,
3565 const u32 *key, const u32 *data,
3566 u64 timeout, gfp_t gfp)
3568 struct nft_set_ext *ext;
3571 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3575 ext = nft_set_elem_ext(set, elem);
3576 nft_set_ext_init(ext, tmpl);
3578 memcpy(nft_set_ext_key(ext), key, set->klen);
3579 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3580 memcpy(nft_set_ext_data(ext), data, set->dlen);
3581 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3582 *nft_set_ext_expiration(ext) =
3584 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3585 *nft_set_ext_timeout(ext) = timeout;
3590 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
3593 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3595 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3596 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3597 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
3598 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3599 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3600 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
3601 (*nft_set_ext_obj(ext))->use--;
3604 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3606 static int nft_setelem_parse_flags(const struct nft_set *set,
3607 const struct nlattr *attr, u32 *flags)
3612 *flags = ntohl(nla_get_be32(attr));
3613 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3615 if (!(set->flags & NFT_SET_INTERVAL) &&
3616 *flags & NFT_SET_ELEM_INTERVAL_END)
3622 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3623 const struct nlattr *attr, u32 nlmsg_flags)
3625 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3626 u8 genmask = nft_genmask_next(ctx->net);
3627 struct nft_data_desc d1, d2;
3628 struct nft_set_ext_tmpl tmpl;
3629 struct nft_set_ext *ext, *ext2;
3630 struct nft_set_elem elem;
3631 struct nft_set_binding *binding;
3632 struct nft_object *obj = NULL;
3633 struct nft_userdata *udata;
3634 struct nft_data data;
3635 enum nft_registers dreg;
3636 struct nft_trans *trans;
3642 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3643 nft_set_elem_policy);
3647 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3650 nft_set_ext_prepare(&tmpl);
3652 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3656 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3658 if (set->flags & NFT_SET_MAP) {
3659 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3660 !(flags & NFT_SET_ELEM_INTERVAL_END))
3662 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3663 flags & NFT_SET_ELEM_INTERVAL_END)
3666 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3671 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3672 if (!(set->flags & NFT_SET_TIMEOUT))
3674 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3675 nla[NFTA_SET_ELEM_TIMEOUT])));
3676 } else if (set->flags & NFT_SET_TIMEOUT) {
3677 timeout = set->timeout;
3680 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3681 nla[NFTA_SET_ELEM_KEY]);
3685 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3688 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3690 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3691 if (timeout != set->timeout)
3692 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3695 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
3696 if (!(set->flags & NFT_SET_OBJECT)) {
3700 obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
3701 set->objtype, genmask);
3706 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
3709 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3710 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3711 nla[NFTA_SET_ELEM_DATA]);
3716 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3719 dreg = nft_type_to_reg(set->dtype);
3720 list_for_each_entry(binding, &set->bindings, list) {
3721 struct nft_ctx bind_ctx = {
3724 .table = ctx->table,
3725 .chain = (struct nft_chain *)binding->chain,
3728 if (!(binding->flags & NFT_SET_MAP))
3731 err = nft_validate_register_store(&bind_ctx, dreg,
3738 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
3741 /* The full maximum length of userdata can exceed the maximum
3742 * offset value (U8_MAX) for following extensions, therefor it
3743 * must be the last extension added.
3746 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3747 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3749 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3754 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
3755 timeout, GFP_KERNEL);
3756 if (elem.priv == NULL)
3759 ext = nft_set_elem_ext(set, elem.priv);
3761 *nft_set_ext_flags(ext) = flags;
3763 udata = nft_set_ext_userdata(ext);
3764 udata->len = ulen - 1;
3765 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3768 *nft_set_ext_obj(ext) = obj;
3772 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3776 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
3777 err = set->ops->insert(ctx->net, set, &elem, &ext2);
3779 if (err == -EEXIST) {
3780 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3781 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
3782 memcmp(nft_set_ext_data(ext),
3783 nft_set_ext_data(ext2), set->dlen) != 0) ||
3784 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3785 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
3786 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
3788 else if (!(nlmsg_flags & NLM_F_EXCL))
3795 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
3800 nft_trans_elem(trans) = elem;
3801 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3805 set->ops->remove(ctx->net, set, &elem);
3811 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3812 nft_data_uninit(&data, d2.type);
3814 nft_data_uninit(&elem.key.val, d1.type);
3819 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3820 struct sk_buff *skb, const struct nlmsghdr *nlh,
3821 const struct nlattr * const nla[])
3823 u8 genmask = nft_genmask_next(net);
3824 const struct nlattr *attr;
3825 struct nft_set *set;
3829 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3832 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3836 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3839 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3840 set = nf_tables_set_lookup_byid(net,
3841 nla[NFTA_SET_ELEM_LIST_SET_ID],
3845 return PTR_ERR(set);
3848 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3851 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3852 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
3859 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3860 const struct nlattr *attr)
3862 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3863 struct nft_set_ext_tmpl tmpl;
3864 struct nft_data_desc desc;
3865 struct nft_set_elem elem;
3866 struct nft_set_ext *ext;
3867 struct nft_trans *trans;
3872 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3873 nft_set_elem_policy);
3878 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3881 nft_set_ext_prepare(&tmpl);
3883 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3887 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3889 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3890 nla[NFTA_SET_ELEM_KEY]);
3895 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3898 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3901 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3903 if (elem.priv == NULL)
3906 ext = nft_set_elem_ext(set, elem.priv);
3908 *nft_set_ext_flags(ext) = flags;
3910 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3911 if (trans == NULL) {
3916 priv = set->ops->deactivate(ctx->net, set, &elem);
3924 nft_trans_elem(trans) = elem;
3925 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3933 nft_data_uninit(&elem.key.val, desc.type);
3938 static int nft_flush_set(const struct nft_ctx *ctx,
3939 struct nft_set *set,
3940 const struct nft_set_iter *iter,
3941 struct nft_set_elem *elem)
3943 struct nft_trans *trans;
3946 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
3947 sizeof(struct nft_trans_elem), GFP_ATOMIC);
3951 if (!set->ops->flush(ctx->net, set, elem->priv)) {
3957 nft_trans_elem_set(trans) = set;
3958 nft_trans_elem(trans) = *elem;
3959 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3967 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3968 struct sk_buff *skb, const struct nlmsghdr *nlh,
3969 const struct nlattr * const nla[])
3971 u8 genmask = nft_genmask_next(net);
3972 const struct nlattr *attr;
3973 struct nft_set *set;
3977 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3981 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3984 return PTR_ERR(set);
3985 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3988 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
3989 struct nft_set_iter iter = {
3991 .fn = nft_flush_set,
3993 set->ops->walk(&ctx, set, &iter);
3998 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3999 err = nft_del_setelem(&ctx, set, attr);
4008 void nft_set_gc_batch_release(struct rcu_head *rcu)
4010 struct nft_set_gc_batch *gcb;
4013 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4014 for (i = 0; i < gcb->head.cnt; i++)
4015 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
4018 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4020 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4023 struct nft_set_gc_batch *gcb;
4025 gcb = kzalloc(sizeof(*gcb), gfp);
4028 gcb->head.set = set;
4031 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4038 * nft_register_obj- register nf_tables stateful object type
4041 * Registers the object type for use with nf_tables. Returns zero on
4042 * success or a negative errno code otherwise.
4044 int nft_register_obj(struct nft_object_type *obj_type)
4046 if (obj_type->type == NFT_OBJECT_UNSPEC)
4049 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4050 list_add_rcu(&obj_type->list, &nf_tables_objects);
4051 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4054 EXPORT_SYMBOL_GPL(nft_register_obj);
4057 * nft_unregister_obj - unregister nf_tables object type
4060 * Unregisters the object type for use with nf_tables.
4062 void nft_unregister_obj(struct nft_object_type *obj_type)
4064 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4065 list_del_rcu(&obj_type->list);
4066 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4068 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4070 struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
4071 const struct nlattr *nla,
4072 u32 objtype, u8 genmask)
4074 struct nft_object *obj;
4076 list_for_each_entry(obj, &table->objects, list) {
4077 if (!nla_strcmp(nla, obj->name) &&
4078 objtype == obj->type->type &&
4079 nft_active_genmask(obj, genmask))
4082 return ERR_PTR(-ENOENT);
4084 EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
4086 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4087 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4088 .len = NFT_TABLE_MAXNAMELEN - 1 },
4089 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4090 .len = NFT_OBJ_MAXNAMELEN - 1 },
4091 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4092 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4095 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4096 const struct nft_object_type *type,
4097 const struct nlattr *attr)
4099 struct nlattr *tb[type->maxattr + 1];
4100 struct nft_object *obj;
4104 err = nla_parse_nested(tb, type->maxattr, attr, type->policy);
4108 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4112 obj = kzalloc(sizeof(struct nft_object) + type->size, GFP_KERNEL);
4116 err = type->init(ctx, (const struct nlattr * const *)tb, obj);
4125 return ERR_PTR(err);
4128 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
4129 struct nft_object *obj, bool reset)
4131 struct nlattr *nest;
4133 nest = nla_nest_start(skb, attr);
4135 goto nla_put_failure;
4136 if (obj->type->dump(skb, obj, reset) < 0)
4137 goto nla_put_failure;
4138 nla_nest_end(skb, nest);
4145 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4147 const struct nft_object_type *type;
4149 list_for_each_entry(type, &nf_tables_objects, list) {
4150 if (objtype == type->type)
4156 static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4158 const struct nft_object_type *type;
4160 type = __nft_obj_type_get(objtype);
4161 if (type != NULL && try_module_get(type->owner))
4164 #ifdef CONFIG_MODULES
4166 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4167 request_module("nft-obj-%u", objtype);
4168 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4169 if (__nft_obj_type_get(objtype))
4170 return ERR_PTR(-EAGAIN);
4173 return ERR_PTR(-ENOENT);
4176 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4177 struct sk_buff *skb, const struct nlmsghdr *nlh,
4178 const struct nlattr * const nla[])
4180 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4181 const struct nft_object_type *type;
4182 u8 genmask = nft_genmask_next(net);
4183 int family = nfmsg->nfgen_family;
4184 struct nft_af_info *afi;
4185 struct nft_table *table;
4186 struct nft_object *obj;
4191 if (!nla[NFTA_OBJ_TYPE] ||
4192 !nla[NFTA_OBJ_NAME] ||
4193 !nla[NFTA_OBJ_DATA])
4196 afi = nf_tables_afinfo_lookup(net, family, true);
4198 return PTR_ERR(afi);
4200 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4202 return PTR_ERR(table);
4204 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4205 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4212 if (nlh->nlmsg_flags & NLM_F_EXCL)
4218 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4220 type = nft_obj_type_get(objtype);
4222 return PTR_ERR(type);
4224 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
4230 nla_strlcpy(obj->name, nla[NFTA_OBJ_NAME], NFT_OBJ_MAXNAMELEN);
4232 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4236 list_add_tail_rcu(&obj->list, &table->objects);
4240 if (obj->type->destroy)
4241 obj->type->destroy(obj);
4244 module_put(type->owner);
4248 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4249 u32 portid, u32 seq, int event, u32 flags,
4250 int family, const struct nft_table *table,
4251 struct nft_object *obj, bool reset)
4253 struct nfgenmsg *nfmsg;
4254 struct nlmsghdr *nlh;
4256 event |= NFNL_SUBSYS_NFTABLES << 8;
4257 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4259 goto nla_put_failure;
4261 nfmsg = nlmsg_data(nlh);
4262 nfmsg->nfgen_family = family;
4263 nfmsg->version = NFNETLINK_V0;
4264 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4266 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4267 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
4268 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->type->type)) ||
4269 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
4270 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
4271 goto nla_put_failure;
4273 nlmsg_end(skb, nlh);
4277 nlmsg_trim(skb, nlh);
4281 struct nft_obj_filter {
4282 char table[NFT_OBJ_MAXNAMELEN];
4286 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4288 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4289 const struct nft_af_info *afi;
4290 const struct nft_table *table;
4291 unsigned int idx = 0, s_idx = cb->args[0];
4292 struct nft_obj_filter *filter = cb->data;
4293 struct net *net = sock_net(skb->sk);
4294 int family = nfmsg->nfgen_family;
4295 struct nft_object *obj;
4298 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4302 cb->seq = net->nft.base_seq;
4304 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
4305 if (family != NFPROTO_UNSPEC && family != afi->family)
4308 list_for_each_entry_rcu(table, &afi->tables, list) {
4309 list_for_each_entry_rcu(obj, &table->objects, list) {
4310 if (!nft_is_active(net, obj))
4315 memset(&cb->args[1], 0,
4316 sizeof(cb->args) - sizeof(cb->args[0]));
4317 if (filter && filter->table[0] &&
4318 strcmp(filter->table, table->name))
4321 filter->type != NFT_OBJECT_UNSPEC &&
4322 obj->type->type != filter->type)
4325 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4328 NLM_F_MULTI | NLM_F_APPEND,
4329 afi->family, table, obj, reset) < 0)
4332 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4345 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4352 static struct nft_obj_filter *
4353 nft_obj_filter_alloc(const struct nlattr * const nla[])
4355 struct nft_obj_filter *filter;
4357 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
4359 return ERR_PTR(-ENOMEM);
4361 if (nla[NFTA_OBJ_TABLE])
4362 nla_strlcpy(filter->table, nla[NFTA_OBJ_TABLE],
4363 NFT_TABLE_MAXNAMELEN);
4364 if (nla[NFTA_OBJ_TYPE])
4365 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4370 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
4371 struct sk_buff *skb, const struct nlmsghdr *nlh,
4372 const struct nlattr * const nla[])
4374 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4375 u8 genmask = nft_genmask_cur(net);
4376 int family = nfmsg->nfgen_family;
4377 const struct nft_af_info *afi;
4378 const struct nft_table *table;
4379 struct nft_object *obj;
4380 struct sk_buff *skb2;
4385 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4386 struct netlink_dump_control c = {
4387 .dump = nf_tables_dump_obj,
4388 .done = nf_tables_dump_obj_done,
4391 if (nla[NFTA_OBJ_TABLE] ||
4392 nla[NFTA_OBJ_TYPE]) {
4393 struct nft_obj_filter *filter;
4395 filter = nft_obj_filter_alloc(nla);
4401 return netlink_dump_start(nlsk, skb, nlh, &c);
4404 if (!nla[NFTA_OBJ_NAME] ||
4405 !nla[NFTA_OBJ_TYPE])
4408 afi = nf_tables_afinfo_lookup(net, family, false);
4410 return PTR_ERR(afi);
4412 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4414 return PTR_ERR(table);
4416 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4417 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4419 return PTR_ERR(obj);
4421 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4425 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4428 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
4429 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
4430 family, table, obj, reset);
4434 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4442 static void nft_obj_destroy(struct nft_object *obj)
4444 if (obj->type->destroy)
4445 obj->type->destroy(obj);
4447 module_put(obj->type->owner);
4451 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
4452 struct sk_buff *skb, const struct nlmsghdr *nlh,
4453 const struct nlattr * const nla[])
4455 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4456 u8 genmask = nft_genmask_next(net);
4457 int family = nfmsg->nfgen_family;
4458 struct nft_af_info *afi;
4459 struct nft_table *table;
4460 struct nft_object *obj;
4464 if (!nla[NFTA_OBJ_TYPE] ||
4465 !nla[NFTA_OBJ_NAME])
4468 afi = nf_tables_afinfo_lookup(net, family, true);
4470 return PTR_ERR(afi);
4472 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4474 return PTR_ERR(table);
4476 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4477 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4479 return PTR_ERR(obj);
4483 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4485 return nft_delobj(&ctx, obj);
4488 void nft_obj_notify(struct net *net, struct nft_table *table,
4489 struct nft_object *obj, u32 portid, u32 seq, int event,
4490 int family, int report, gfp_t gfp)
4492 struct sk_buff *skb;
4496 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4499 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
4503 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
4510 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
4513 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4515 EXPORT_SYMBOL_GPL(nft_obj_notify);
4517 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
4518 struct nft_object *obj, int event)
4520 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
4521 ctx->afi->family, ctx->report, GFP_KERNEL);
4524 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
4525 u32 portid, u32 seq)
4527 struct nlmsghdr *nlh;
4528 struct nfgenmsg *nfmsg;
4529 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
4531 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
4533 goto nla_put_failure;
4535 nfmsg = nlmsg_data(nlh);
4536 nfmsg->nfgen_family = AF_UNSPEC;
4537 nfmsg->version = NFNETLINK_V0;
4538 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4540 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
4541 goto nla_put_failure;
4543 nlmsg_end(skb, nlh);
4547 nlmsg_trim(skb, nlh);
4551 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
4554 struct nlmsghdr *nlh = nlmsg_hdr(skb);
4555 struct sk_buff *skb2;
4558 if (nlmsg_report(nlh) &&
4559 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4562 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4566 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4573 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4574 nlmsg_report(nlh), GFP_KERNEL);
4577 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4581 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
4582 struct sk_buff *skb, const struct nlmsghdr *nlh,
4583 const struct nlattr * const nla[])
4585 struct sk_buff *skb2;
4588 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4592 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4597 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4603 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
4604 [NFT_MSG_NEWTABLE] = {
4605 .call_batch = nf_tables_newtable,
4606 .attr_count = NFTA_TABLE_MAX,
4607 .policy = nft_table_policy,
4609 [NFT_MSG_GETTABLE] = {
4610 .call = nf_tables_gettable,
4611 .attr_count = NFTA_TABLE_MAX,
4612 .policy = nft_table_policy,
4614 [NFT_MSG_DELTABLE] = {
4615 .call_batch = nf_tables_deltable,
4616 .attr_count = NFTA_TABLE_MAX,
4617 .policy = nft_table_policy,
4619 [NFT_MSG_NEWCHAIN] = {
4620 .call_batch = nf_tables_newchain,
4621 .attr_count = NFTA_CHAIN_MAX,
4622 .policy = nft_chain_policy,
4624 [NFT_MSG_GETCHAIN] = {
4625 .call = nf_tables_getchain,
4626 .attr_count = NFTA_CHAIN_MAX,
4627 .policy = nft_chain_policy,
4629 [NFT_MSG_DELCHAIN] = {
4630 .call_batch = nf_tables_delchain,
4631 .attr_count = NFTA_CHAIN_MAX,
4632 .policy = nft_chain_policy,
4634 [NFT_MSG_NEWRULE] = {
4635 .call_batch = nf_tables_newrule,
4636 .attr_count = NFTA_RULE_MAX,
4637 .policy = nft_rule_policy,
4639 [NFT_MSG_GETRULE] = {
4640 .call = nf_tables_getrule,
4641 .attr_count = NFTA_RULE_MAX,
4642 .policy = nft_rule_policy,
4644 [NFT_MSG_DELRULE] = {
4645 .call_batch = nf_tables_delrule,
4646 .attr_count = NFTA_RULE_MAX,
4647 .policy = nft_rule_policy,
4649 [NFT_MSG_NEWSET] = {
4650 .call_batch = nf_tables_newset,
4651 .attr_count = NFTA_SET_MAX,
4652 .policy = nft_set_policy,
4654 [NFT_MSG_GETSET] = {
4655 .call = nf_tables_getset,
4656 .attr_count = NFTA_SET_MAX,
4657 .policy = nft_set_policy,
4659 [NFT_MSG_DELSET] = {
4660 .call_batch = nf_tables_delset,
4661 .attr_count = NFTA_SET_MAX,
4662 .policy = nft_set_policy,
4664 [NFT_MSG_NEWSETELEM] = {
4665 .call_batch = nf_tables_newsetelem,
4666 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4667 .policy = nft_set_elem_list_policy,
4669 [NFT_MSG_GETSETELEM] = {
4670 .call = nf_tables_getsetelem,
4671 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4672 .policy = nft_set_elem_list_policy,
4674 [NFT_MSG_DELSETELEM] = {
4675 .call_batch = nf_tables_delsetelem,
4676 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4677 .policy = nft_set_elem_list_policy,
4679 [NFT_MSG_GETGEN] = {
4680 .call = nf_tables_getgen,
4682 [NFT_MSG_NEWOBJ] = {
4683 .call_batch = nf_tables_newobj,
4684 .attr_count = NFTA_OBJ_MAX,
4685 .policy = nft_obj_policy,
4687 [NFT_MSG_GETOBJ] = {
4688 .call = nf_tables_getobj,
4689 .attr_count = NFTA_OBJ_MAX,
4690 .policy = nft_obj_policy,
4692 [NFT_MSG_DELOBJ] = {
4693 .call_batch = nf_tables_delobj,
4694 .attr_count = NFTA_OBJ_MAX,
4695 .policy = nft_obj_policy,
4697 [NFT_MSG_GETOBJ_RESET] = {
4698 .call = nf_tables_getobj,
4699 .attr_count = NFTA_OBJ_MAX,
4700 .policy = nft_obj_policy,
4704 static void nft_chain_commit_update(struct nft_trans *trans)
4706 struct nft_base_chain *basechain;
4708 if (nft_trans_chain_name(trans)[0])
4709 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
4711 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
4714 basechain = nft_base_chain(trans->ctx.chain);
4715 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
4717 switch (nft_trans_chain_policy(trans)) {
4720 basechain->policy = nft_trans_chain_policy(trans);
4725 static void nf_tables_commit_release(struct nft_trans *trans)
4727 switch (trans->msg_type) {
4728 case NFT_MSG_DELTABLE:
4729 nf_tables_table_destroy(&trans->ctx);
4731 case NFT_MSG_DELCHAIN:
4732 nf_tables_chain_destroy(trans->ctx.chain);
4734 case NFT_MSG_DELRULE:
4735 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4737 case NFT_MSG_DELSET:
4738 nft_set_destroy(nft_trans_set(trans));
4740 case NFT_MSG_DELSETELEM:
4741 nft_set_elem_destroy(nft_trans_elem_set(trans),
4742 nft_trans_elem(trans).priv, true);
4744 case NFT_MSG_DELOBJ:
4745 nft_obj_destroy(nft_trans_obj(trans));
4751 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
4753 struct nft_trans *trans, *next;
4754 struct nft_trans_elem *te;
4756 /* Bump generation counter, invalidate any dump in progress */
4757 while (++net->nft.base_seq == 0);
4759 /* A new generation has just started */
4760 net->nft.gencursor = nft_gencursor_next(net);
4762 /* Make sure all packets have left the previous generation before
4763 * purging old rules.
4767 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4768 switch (trans->msg_type) {
4769 case NFT_MSG_NEWTABLE:
4770 if (nft_trans_table_update(trans)) {
4771 if (!nft_trans_table_enable(trans)) {
4772 nf_tables_table_disable(net,
4775 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4778 nft_clear(net, trans->ctx.table);
4780 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
4781 nft_trans_destroy(trans);
4783 case NFT_MSG_DELTABLE:
4784 list_del_rcu(&trans->ctx.table->list);
4785 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
4787 case NFT_MSG_NEWCHAIN:
4788 if (nft_trans_chain_update(trans))
4789 nft_chain_commit_update(trans);
4791 nft_clear(net, trans->ctx.chain);
4793 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
4794 nft_trans_destroy(trans);
4796 case NFT_MSG_DELCHAIN:
4797 list_del_rcu(&trans->ctx.chain->list);
4798 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
4799 nf_tables_unregister_hooks(trans->ctx.net,
4802 trans->ctx.afi->nops);
4804 case NFT_MSG_NEWRULE:
4805 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4806 nf_tables_rule_notify(&trans->ctx,
4807 nft_trans_rule(trans),
4809 nft_trans_destroy(trans);
4811 case NFT_MSG_DELRULE:
4812 list_del_rcu(&nft_trans_rule(trans)->list);
4813 nf_tables_rule_notify(&trans->ctx,
4814 nft_trans_rule(trans),
4817 case NFT_MSG_NEWSET:
4818 nft_clear(net, nft_trans_set(trans));
4819 /* This avoids hitting -EBUSY when deleting the table
4820 * from the transaction.
4822 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4823 !list_empty(&nft_trans_set(trans)->bindings))
4824 trans->ctx.table->use--;
4826 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4827 NFT_MSG_NEWSET, GFP_KERNEL);
4828 nft_trans_destroy(trans);
4830 case NFT_MSG_DELSET:
4831 list_del_rcu(&nft_trans_set(trans)->list);
4832 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4833 NFT_MSG_DELSET, GFP_KERNEL);
4835 case NFT_MSG_NEWSETELEM:
4836 te = (struct nft_trans_elem *)trans->data;
4838 te->set->ops->activate(net, te->set, &te->elem);
4839 nf_tables_setelem_notify(&trans->ctx, te->set,
4841 NFT_MSG_NEWSETELEM, 0);
4842 nft_trans_destroy(trans);
4844 case NFT_MSG_DELSETELEM:
4845 te = (struct nft_trans_elem *)trans->data;
4847 nf_tables_setelem_notify(&trans->ctx, te->set,
4849 NFT_MSG_DELSETELEM, 0);
4850 te->set->ops->remove(net, te->set, &te->elem);
4851 atomic_dec(&te->set->nelems);
4854 case NFT_MSG_NEWOBJ:
4855 nft_clear(net, nft_trans_obj(trans));
4856 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4858 nft_trans_destroy(trans);
4860 case NFT_MSG_DELOBJ:
4861 list_del_rcu(&nft_trans_obj(trans)->list);
4862 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4870 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4871 list_del(&trans->list);
4872 nf_tables_commit_release(trans);
4875 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
4880 static void nf_tables_abort_release(struct nft_trans *trans)
4882 switch (trans->msg_type) {
4883 case NFT_MSG_NEWTABLE:
4884 nf_tables_table_destroy(&trans->ctx);
4886 case NFT_MSG_NEWCHAIN:
4887 nf_tables_chain_destroy(trans->ctx.chain);
4889 case NFT_MSG_NEWRULE:
4890 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4892 case NFT_MSG_NEWSET:
4893 nft_set_destroy(nft_trans_set(trans));
4895 case NFT_MSG_NEWSETELEM:
4896 nft_set_elem_destroy(nft_trans_elem_set(trans),
4897 nft_trans_elem(trans).priv, true);
4899 case NFT_MSG_NEWOBJ:
4900 nft_obj_destroy(nft_trans_obj(trans));
4906 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
4908 struct nft_trans *trans, *next;
4909 struct nft_trans_elem *te;
4911 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4913 switch (trans->msg_type) {
4914 case NFT_MSG_NEWTABLE:
4915 if (nft_trans_table_update(trans)) {
4916 if (nft_trans_table_enable(trans)) {
4917 nf_tables_table_disable(net,
4920 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4922 nft_trans_destroy(trans);
4924 list_del_rcu(&trans->ctx.table->list);
4927 case NFT_MSG_DELTABLE:
4928 nft_clear(trans->ctx.net, trans->ctx.table);
4929 nft_trans_destroy(trans);
4931 case NFT_MSG_NEWCHAIN:
4932 if (nft_trans_chain_update(trans)) {
4933 free_percpu(nft_trans_chain_stats(trans));
4935 nft_trans_destroy(trans);
4937 trans->ctx.table->use--;
4938 list_del_rcu(&trans->ctx.chain->list);
4939 nf_tables_unregister_hooks(trans->ctx.net,
4942 trans->ctx.afi->nops);
4945 case NFT_MSG_DELCHAIN:
4946 trans->ctx.table->use++;
4947 nft_clear(trans->ctx.net, trans->ctx.chain);
4948 nft_trans_destroy(trans);
4950 case NFT_MSG_NEWRULE:
4951 trans->ctx.chain->use--;
4952 list_del_rcu(&nft_trans_rule(trans)->list);
4954 case NFT_MSG_DELRULE:
4955 trans->ctx.chain->use++;
4956 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4957 nft_trans_destroy(trans);
4959 case NFT_MSG_NEWSET:
4960 trans->ctx.table->use--;
4961 list_del_rcu(&nft_trans_set(trans)->list);
4963 case NFT_MSG_DELSET:
4964 trans->ctx.table->use++;
4965 nft_clear(trans->ctx.net, nft_trans_set(trans));
4966 nft_trans_destroy(trans);
4968 case NFT_MSG_NEWSETELEM:
4969 te = (struct nft_trans_elem *)trans->data;
4971 te->set->ops->remove(net, te->set, &te->elem);
4972 atomic_dec(&te->set->nelems);
4974 case NFT_MSG_DELSETELEM:
4975 te = (struct nft_trans_elem *)trans->data;
4977 te->set->ops->activate(net, te->set, &te->elem);
4980 nft_trans_destroy(trans);
4982 case NFT_MSG_NEWOBJ:
4983 trans->ctx.table->use--;
4984 list_del_rcu(&nft_trans_obj(trans)->list);
4986 case NFT_MSG_DELOBJ:
4987 trans->ctx.table->use++;
4988 nft_clear(trans->ctx.net, nft_trans_obj(trans));
4989 nft_trans_destroy(trans);
4996 list_for_each_entry_safe_reverse(trans, next,
4997 &net->nft.commit_list, list) {
4998 list_del(&trans->list);
4999 nf_tables_abort_release(trans);
5005 static bool nf_tables_valid_genid(struct net *net, u32 genid)
5007 return net->nft.base_seq == genid;
5010 static const struct nfnetlink_subsystem nf_tables_subsys = {
5011 .name = "nf_tables",
5012 .subsys_id = NFNL_SUBSYS_NFTABLES,
5013 .cb_count = NFT_MSG_MAX,
5015 .commit = nf_tables_commit,
5016 .abort = nf_tables_abort,
5017 .valid_genid = nf_tables_valid_genid,
5020 int nft_chain_validate_dependency(const struct nft_chain *chain,
5021 enum nft_chain_type type)
5023 const struct nft_base_chain *basechain;
5025 if (chain->flags & NFT_BASE_CHAIN) {
5026 basechain = nft_base_chain(chain);
5027 if (basechain->type->type != type)
5032 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
5034 int nft_chain_validate_hooks(const struct nft_chain *chain,
5035 unsigned int hook_flags)
5037 struct nft_base_chain *basechain;
5039 if (chain->flags & NFT_BASE_CHAIN) {
5040 basechain = nft_base_chain(chain);
5042 if ((1 << basechain->ops[0].hooknum) & hook_flags)
5050 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
5053 * Loop detection - walk through the ruleset beginning at the destination chain
5054 * of a new jump until either the source chain is reached (loop) or all
5055 * reachable chains have been traversed.
5057 * The loop check is performed whenever a new jump verdict is added to an
5058 * expression or verdict map or a verdict map is bound to a new chain.
5061 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5062 const struct nft_chain *chain);
5064 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
5065 struct nft_set *set,
5066 const struct nft_set_iter *iter,
5067 struct nft_set_elem *elem)
5069 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5070 const struct nft_data *data;
5072 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5073 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
5076 data = nft_set_ext_data(ext);
5077 switch (data->verdict.code) {
5080 return nf_tables_check_loops(ctx, data->verdict.chain);
5086 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5087 const struct nft_chain *chain)
5089 const struct nft_rule *rule;
5090 const struct nft_expr *expr, *last;
5091 struct nft_set *set;
5092 struct nft_set_binding *binding;
5093 struct nft_set_iter iter;
5095 if (ctx->chain == chain)
5098 list_for_each_entry(rule, &chain->rules, list) {
5099 nft_rule_for_each_expr(expr, last, rule) {
5100 const struct nft_data *data = NULL;
5103 if (!expr->ops->validate)
5106 err = expr->ops->validate(ctx, expr, &data);
5113 switch (data->verdict.code) {
5116 err = nf_tables_check_loops(ctx,
5117 data->verdict.chain);
5126 list_for_each_entry(set, &ctx->table->sets, list) {
5127 if (!nft_is_active_next(ctx->net, set))
5129 if (!(set->flags & NFT_SET_MAP) ||
5130 set->dtype != NFT_DATA_VERDICT)
5133 list_for_each_entry(binding, &set->bindings, list) {
5134 if (!(binding->flags & NFT_SET_MAP) ||
5135 binding->chain != chain)
5138 iter.genmask = nft_genmask_next(ctx->net);
5142 iter.fn = nf_tables_loop_check_setelem;
5144 set->ops->walk(ctx, set, &iter);
5154 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
5156 * @attr: netlink attribute to fetch value from
5157 * @max: maximum value to be stored in dest
5158 * @dest: pointer to the variable
5160 * Parse, check and store a given u32 netlink attribute into variable.
5161 * This function returns -ERANGE if the value goes over maximum value.
5162 * Otherwise a 0 is returned and the attribute value is stored in the
5163 * destination variable.
5165 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
5169 val = ntohl(nla_get_be32(attr));
5176 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
5179 * nft_parse_register - parse a register value from a netlink attribute
5181 * @attr: netlink attribute
5183 * Parse and translate a register value from a netlink attribute.
5184 * Registers used to be 128 bit wide, these register numbers will be
5185 * mapped to the corresponding 32 bit register numbers.
5187 unsigned int nft_parse_register(const struct nlattr *attr)
5191 reg = ntohl(nla_get_be32(attr));
5193 case NFT_REG_VERDICT...NFT_REG_4:
5194 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
5196 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
5199 EXPORT_SYMBOL_GPL(nft_parse_register);
5202 * nft_dump_register - dump a register value to a netlink attribute
5204 * @skb: socket buffer
5205 * @attr: attribute number
5206 * @reg: register number
5208 * Construct a netlink attribute containing the register number. For
5209 * compatibility reasons, register numbers being a multiple of 4 are
5210 * translated to the corresponding 128 bit register numbers.
5212 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
5214 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
5215 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
5217 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
5219 return nla_put_be32(skb, attr, htonl(reg));
5221 EXPORT_SYMBOL_GPL(nft_dump_register);
5224 * nft_validate_register_load - validate a load from a register
5226 * @reg: the register number
5227 * @len: the length of the data
5229 * Validate that the input register is one of the general purpose
5230 * registers and that the length of the load is within the bounds.
5232 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
5234 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5238 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
5243 EXPORT_SYMBOL_GPL(nft_validate_register_load);
5246 * nft_validate_register_store - validate an expressions' register store
5248 * @ctx: context of the expression performing the load
5249 * @reg: the destination register number
5250 * @data: the data to load
5251 * @type: the data type
5252 * @len: the length of the data
5254 * Validate that a data load uses the appropriate data type for
5255 * the destination register and the length is within the bounds.
5256 * A value of NULL for the data means that its runtime gathered
5259 int nft_validate_register_store(const struct nft_ctx *ctx,
5260 enum nft_registers reg,
5261 const struct nft_data *data,
5262 enum nft_data_types type, unsigned int len)
5267 case NFT_REG_VERDICT:
5268 if (type != NFT_DATA_VERDICT)
5272 (data->verdict.code == NFT_GOTO ||
5273 data->verdict.code == NFT_JUMP)) {
5274 err = nf_tables_check_loops(ctx, data->verdict.chain);
5278 if (ctx->chain->level + 1 >
5279 data->verdict.chain->level) {
5280 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
5282 data->verdict.chain->level = ctx->chain->level + 1;
5288 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5292 if (reg * NFT_REG32_SIZE + len >
5293 FIELD_SIZEOF(struct nft_regs, data))
5296 if (data != NULL && type != NFT_DATA_VALUE)
5301 EXPORT_SYMBOL_GPL(nft_validate_register_store);
5303 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
5304 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
5305 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
5306 .len = NFT_CHAIN_MAXNAMELEN - 1 },
5309 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
5310 struct nft_data_desc *desc, const struct nlattr *nla)
5312 u8 genmask = nft_genmask_next(ctx->net);
5313 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
5314 struct nft_chain *chain;
5317 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
5321 if (!tb[NFTA_VERDICT_CODE])
5323 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
5325 switch (data->verdict.code) {
5327 switch (data->verdict.code & NF_VERDICT_MASK) {
5342 if (!tb[NFTA_VERDICT_CHAIN])
5344 chain = nf_tables_chain_lookup(ctx->table,
5345 tb[NFTA_VERDICT_CHAIN], genmask);
5347 return PTR_ERR(chain);
5348 if (chain->flags & NFT_BASE_CHAIN)
5352 data->verdict.chain = chain;
5356 desc->len = sizeof(data->verdict);
5357 desc->type = NFT_DATA_VERDICT;
5361 static void nft_verdict_uninit(const struct nft_data *data)
5363 switch (data->verdict.code) {
5366 data->verdict.chain->use--;
5371 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
5373 struct nlattr *nest;
5375 nest = nla_nest_start(skb, type);
5377 goto nla_put_failure;
5379 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
5380 goto nla_put_failure;
5385 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
5387 goto nla_put_failure;
5389 nla_nest_end(skb, nest);
5396 static int nft_value_init(const struct nft_ctx *ctx,
5397 struct nft_data *data, unsigned int size,
5398 struct nft_data_desc *desc, const struct nlattr *nla)
5408 nla_memcpy(data->data, nla, len);
5409 desc->type = NFT_DATA_VALUE;
5414 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
5417 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
5420 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
5421 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
5422 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
5426 * nft_data_init - parse nf_tables data netlink attributes
5428 * @ctx: context of the expression using the data
5429 * @data: destination struct nft_data
5430 * @size: maximum data length
5431 * @desc: data description
5432 * @nla: netlink attribute containing data
5434 * Parse the netlink data attributes and initialize a struct nft_data.
5435 * The type and length of data are returned in the data description.
5437 * The caller can indicate that it only wants to accept data of type
5438 * NFT_DATA_VALUE by passing NULL for the ctx argument.
5440 int nft_data_init(const struct nft_ctx *ctx,
5441 struct nft_data *data, unsigned int size,
5442 struct nft_data_desc *desc, const struct nlattr *nla)
5444 struct nlattr *tb[NFTA_DATA_MAX + 1];
5447 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
5451 if (tb[NFTA_DATA_VALUE])
5452 return nft_value_init(ctx, data, size, desc,
5453 tb[NFTA_DATA_VALUE]);
5454 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
5455 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
5458 EXPORT_SYMBOL_GPL(nft_data_init);
5461 * nft_data_uninit - release a nft_data item
5463 * @data: struct nft_data to release
5464 * @type: type of data
5466 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5467 * all others need to be released by calling this function.
5469 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
5471 if (type < NFT_DATA_VERDICT)
5474 case NFT_DATA_VERDICT:
5475 return nft_verdict_uninit(data);
5480 EXPORT_SYMBOL_GPL(nft_data_uninit);
5482 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
5483 enum nft_data_types type, unsigned int len)
5485 struct nlattr *nest;
5488 nest = nla_nest_start(skb, attr);
5493 case NFT_DATA_VALUE:
5494 err = nft_value_dump(skb, data, len);
5496 case NFT_DATA_VERDICT:
5497 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
5504 nla_nest_end(skb, nest);
5507 EXPORT_SYMBOL_GPL(nft_data_dump);
5509 static int __net_init nf_tables_init_net(struct net *net)
5511 INIT_LIST_HEAD(&net->nft.af_info);
5512 INIT_LIST_HEAD(&net->nft.commit_list);
5513 net->nft.base_seq = 1;
5517 int __nft_release_basechain(struct nft_ctx *ctx)
5519 struct nft_rule *rule, *nr;
5521 BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
5523 nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
5525 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
5526 list_del(&rule->list);
5528 nf_tables_rule_destroy(ctx, rule);
5530 list_del(&ctx->chain->list);
5532 nf_tables_chain_destroy(ctx->chain);
5536 EXPORT_SYMBOL_GPL(__nft_release_basechain);
5538 /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
5539 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
5541 struct nft_table *table, *nt;
5542 struct nft_chain *chain, *nc;
5543 struct nft_object *obj, *ne;
5544 struct nft_rule *rule, *nr;
5545 struct nft_set *set, *ns;
5546 struct nft_ctx ctx = {
5551 list_for_each_entry_safe(table, nt, &afi->tables, list) {
5552 list_for_each_entry(chain, &table->chains, list)
5553 nf_tables_unregister_hooks(net, table, chain,
5555 /* No packets are walking on these chains anymore. */
5557 list_for_each_entry(chain, &table->chains, list) {
5559 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
5560 list_del(&rule->list);
5562 nf_tables_rule_destroy(&ctx, rule);
5565 list_for_each_entry_safe(set, ns, &table->sets, list) {
5566 list_del(&set->list);
5568 nft_set_destroy(set);
5570 list_for_each_entry_safe(obj, ne, &table->objects, list) {
5571 list_del(&obj->list);
5573 nft_obj_destroy(obj);
5575 list_for_each_entry_safe(chain, nc, &table->chains, list) {
5576 list_del(&chain->list);
5578 nf_tables_chain_destroy(chain);
5580 list_del(&table->list);
5581 nf_tables_table_destroy(&ctx);
5585 static struct pernet_operations nf_tables_net_ops = {
5586 .init = nf_tables_init_net,
5589 static int __init nf_tables_module_init(void)
5593 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
5600 err = nf_tables_core_module_init();
5604 err = nfnetlink_subsys_register(&nf_tables_subsys);
5608 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
5609 return register_pernet_subsys(&nf_tables_net_ops);
5611 nf_tables_core_module_exit();
5618 static void __exit nf_tables_module_exit(void)
5620 unregister_pernet_subsys(&nf_tables_net_ops);
5621 nfnetlink_subsys_unregister(&nf_tables_subsys);
5623 nf_tables_core_module_exit();
5627 module_init(nf_tables_module_init);
5628 module_exit(nf_tables_module_exit);
5630 MODULE_LICENSE("GPL");
5631 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
5632 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);