2 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/list.h>
14 #include <linux/skbuff.h>
15 #include <linux/netlink.h>
16 #include <linux/vmalloc.h>
17 #include <linux/rhashtable.h>
18 #include <linux/netfilter.h>
19 #include <linux/netfilter/nfnetlink.h>
20 #include <linux/netfilter/nf_tables.h>
21 #include <net/netfilter/nf_flow_table.h>
22 #include <net/netfilter/nf_tables_core.h>
23 #include <net/netfilter/nf_tables.h>
24 #include <net/net_namespace.h>
27 static LIST_HEAD(nf_tables_expressions);
28 static LIST_HEAD(nf_tables_objects);
29 static LIST_HEAD(nf_tables_flowtables);
30 static LIST_HEAD(nf_tables_destroy_list);
31 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
32 static u64 table_handle;
35 NFT_VALIDATE_SKIP = 0,
40 static struct rhltable nft_objname_ht;
42 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
43 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
44 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
46 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
47 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
48 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
50 static const struct rhashtable_params nft_chain_ht_params = {
51 .head_offset = offsetof(struct nft_chain, rhlhead),
52 .key_offset = offsetof(struct nft_chain, name),
53 .hashfn = nft_chain_hash,
54 .obj_hashfn = nft_chain_hash_obj,
55 .obj_cmpfn = nft_chain_hash_cmp,
56 .automatic_shrinking = true,
59 static const struct rhashtable_params nft_objname_ht_params = {
60 .head_offset = offsetof(struct nft_object, rhlhead),
61 .key_offset = offsetof(struct nft_object, key),
62 .hashfn = nft_objname_hash,
63 .obj_hashfn = nft_objname_hash_obj,
64 .obj_cmpfn = nft_objname_hash_cmp,
65 .automatic_shrinking = true,
68 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
70 switch (net->nft.validate_state) {
71 case NFT_VALIDATE_SKIP:
72 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
74 case NFT_VALIDATE_NEED:
77 if (new_validate_state == NFT_VALIDATE_NEED)
81 net->nft.validate_state = new_validate_state;
83 static void nf_tables_trans_destroy_work(struct work_struct *w);
84 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
86 static void nft_ctx_init(struct nft_ctx *ctx,
88 const struct sk_buff *skb,
89 const struct nlmsghdr *nlh,
91 struct nft_table *table,
92 struct nft_chain *chain,
93 const struct nlattr * const *nla)
101 ctx->portid = NETLINK_CB(skb).portid;
102 ctx->report = nlmsg_report(nlh);
103 ctx->seq = nlh->nlmsg_seq;
106 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
107 int msg_type, u32 size, gfp_t gfp)
109 struct nft_trans *trans;
111 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
115 trans->msg_type = msg_type;
121 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
122 int msg_type, u32 size)
124 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
127 static void nft_trans_destroy(struct nft_trans *trans)
129 list_del(&trans->list);
133 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
135 struct net *net = ctx->net;
136 struct nft_trans *trans;
138 if (!nft_set_is_anonymous(set))
141 list_for_each_entry_reverse(trans, &net->nft.commit_list, list) {
142 if (trans->msg_type == NFT_MSG_NEWSET &&
143 nft_trans_set(trans) == set) {
150 static int nf_tables_register_hook(struct net *net,
151 const struct nft_table *table,
152 struct nft_chain *chain)
154 const struct nft_base_chain *basechain;
155 const struct nf_hook_ops *ops;
157 if (table->flags & NFT_TABLE_F_DORMANT ||
158 !nft_is_base_chain(chain))
161 basechain = nft_base_chain(chain);
162 ops = &basechain->ops;
164 if (basechain->type->ops_register)
165 return basechain->type->ops_register(net, ops);
167 return nf_register_net_hook(net, ops);
170 static void nf_tables_unregister_hook(struct net *net,
171 const struct nft_table *table,
172 struct nft_chain *chain)
174 const struct nft_base_chain *basechain;
175 const struct nf_hook_ops *ops;
177 if (table->flags & NFT_TABLE_F_DORMANT ||
178 !nft_is_base_chain(chain))
180 basechain = nft_base_chain(chain);
181 ops = &basechain->ops;
183 if (basechain->type->ops_unregister)
184 return basechain->type->ops_unregister(net, ops);
186 nf_unregister_net_hook(net, ops);
189 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
191 struct nft_trans *trans;
193 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
197 if (msg_type == NFT_MSG_NEWTABLE)
198 nft_activate_next(ctx->net, ctx->table);
200 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
204 static int nft_deltable(struct nft_ctx *ctx)
208 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
212 nft_deactivate_next(ctx->net, ctx->table);
216 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
218 struct nft_trans *trans;
220 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
222 return ERR_PTR(-ENOMEM);
224 if (msg_type == NFT_MSG_NEWCHAIN)
225 nft_activate_next(ctx->net, ctx->chain);
227 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
231 static int nft_delchain(struct nft_ctx *ctx)
233 struct nft_trans *trans;
235 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
237 return PTR_ERR(trans);
240 nft_deactivate_next(ctx->net, ctx->chain);
245 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
246 struct nft_rule *rule)
248 struct nft_expr *expr;
250 expr = nft_expr_first(rule);
251 while (expr != nft_expr_last(rule) && expr->ops) {
252 if (expr->ops->activate)
253 expr->ops->activate(ctx, expr);
255 expr = nft_expr_next(expr);
259 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
260 struct nft_rule *rule,
261 enum nft_trans_phase phase)
263 struct nft_expr *expr;
265 expr = nft_expr_first(rule);
266 while (expr != nft_expr_last(rule) && expr->ops) {
267 if (expr->ops->deactivate)
268 expr->ops->deactivate(ctx, expr, phase);
270 expr = nft_expr_next(expr);
275 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
277 /* You cannot delete the same rule twice */
278 if (nft_is_active_next(ctx->net, rule)) {
279 nft_deactivate_next(ctx->net, rule);
286 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
287 struct nft_rule *rule)
289 struct nft_trans *trans;
291 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
295 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
296 nft_trans_rule_id(trans) =
297 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
299 nft_trans_rule(trans) = rule;
300 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
305 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
307 struct nft_trans *trans;
310 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
314 err = nf_tables_delrule_deactivate(ctx, rule);
316 nft_trans_destroy(trans);
319 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
324 static int nft_delrule_by_chain(struct nft_ctx *ctx)
326 struct nft_rule *rule;
329 list_for_each_entry(rule, &ctx->chain->rules, list) {
330 if (!nft_is_active_next(ctx->net, rule))
333 err = nft_delrule(ctx, rule);
340 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
343 struct nft_trans *trans;
345 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
349 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
350 nft_trans_set_id(trans) =
351 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
352 nft_activate_next(ctx->net, set);
354 nft_trans_set(trans) = set;
355 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
360 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
364 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
368 nft_deactivate_next(ctx->net, set);
374 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
375 struct nft_object *obj)
377 struct nft_trans *trans;
379 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
383 if (msg_type == NFT_MSG_NEWOBJ)
384 nft_activate_next(ctx->net, obj);
386 nft_trans_obj(trans) = obj;
387 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
392 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
396 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
400 nft_deactivate_next(ctx->net, obj);
406 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
407 struct nft_flowtable *flowtable)
409 struct nft_trans *trans;
411 trans = nft_trans_alloc(ctx, msg_type,
412 sizeof(struct nft_trans_flowtable));
416 if (msg_type == NFT_MSG_NEWFLOWTABLE)
417 nft_activate_next(ctx->net, flowtable);
419 nft_trans_flowtable(trans) = flowtable;
420 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
425 static int nft_delflowtable(struct nft_ctx *ctx,
426 struct nft_flowtable *flowtable)
430 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
434 nft_deactivate_next(ctx->net, flowtable);
444 static struct nft_table *nft_table_lookup(const struct net *net,
445 const struct nlattr *nla,
446 u8 family, u8 genmask)
448 struct nft_table *table;
451 return ERR_PTR(-EINVAL);
453 list_for_each_entry_rcu(table, &net->nft.tables, list) {
454 if (!nla_strcmp(nla, table->name) &&
455 table->family == family &&
456 nft_active_genmask(table, genmask))
460 return ERR_PTR(-ENOENT);
463 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
464 const struct nlattr *nla,
467 struct nft_table *table;
469 list_for_each_entry(table, &net->nft.tables, list) {
470 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
471 nft_active_genmask(table, genmask))
475 return ERR_PTR(-ENOENT);
478 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
480 return ++table->hgenerator;
483 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
485 static const struct nft_chain_type *
486 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
490 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
491 if (chain_type[family][i] != NULL &&
492 !nla_strcmp(nla, chain_type[family][i]->name))
493 return chain_type[family][i];
499 * Loading a module requires dropping mutex that guards the
501 * We first need to abort any pending transactions as once
502 * mutex is unlocked a different client could start a new
503 * transaction. It must not see any 'future generation'
504 * changes * as these changes will never happen.
506 #ifdef CONFIG_MODULES
507 static int __nf_tables_abort(struct net *net);
509 static void nft_request_module(struct net *net, const char *fmt, ...)
511 char module_name[MODULE_NAME_LEN];
515 __nf_tables_abort(net);
518 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
520 if (WARN(ret >= MODULE_NAME_LEN, "truncated: '%s' (len %d)", module_name, ret))
523 mutex_unlock(&net->nft.commit_mutex);
524 request_module("%s", module_name);
525 mutex_lock(&net->nft.commit_mutex);
529 static void lockdep_nfnl_nft_mutex_not_held(void)
531 #ifdef CONFIG_PROVE_LOCKING
532 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
536 static const struct nft_chain_type *
537 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
538 u8 family, bool autoload)
540 const struct nft_chain_type *type;
542 type = __nf_tables_chain_type_lookup(nla, family);
546 lockdep_nfnl_nft_mutex_not_held();
547 #ifdef CONFIG_MODULES
549 nft_request_module(net, "nft-chain-%u-%.*s", family,
550 nla_len(nla), (const char *)nla_data(nla));
551 type = __nf_tables_chain_type_lookup(nla, family);
553 return ERR_PTR(-EAGAIN);
556 return ERR_PTR(-ENOENT);
559 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
560 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
561 .len = NFT_TABLE_MAXNAMELEN - 1 },
562 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
563 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
566 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
567 u32 portid, u32 seq, int event, u32 flags,
568 int family, const struct nft_table *table)
570 struct nlmsghdr *nlh;
571 struct nfgenmsg *nfmsg;
573 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
574 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
576 goto nla_put_failure;
578 nfmsg = nlmsg_data(nlh);
579 nfmsg->nfgen_family = family;
580 nfmsg->version = NFNETLINK_V0;
581 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
583 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
584 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
585 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
586 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
588 goto nla_put_failure;
594 nlmsg_trim(skb, nlh);
598 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
604 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
607 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
611 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
612 event, 0, ctx->family, ctx->table);
618 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
619 ctx->report, GFP_KERNEL);
622 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
625 static int nf_tables_dump_tables(struct sk_buff *skb,
626 struct netlink_callback *cb)
628 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
629 const struct nft_table *table;
630 unsigned int idx = 0, s_idx = cb->args[0];
631 struct net *net = sock_net(skb->sk);
632 int family = nfmsg->nfgen_family;
635 cb->seq = net->nft.base_seq;
637 list_for_each_entry_rcu(table, &net->nft.tables, list) {
638 if (family != NFPROTO_UNSPEC && family != table->family)
644 memset(&cb->args[1], 0,
645 sizeof(cb->args) - sizeof(cb->args[0]));
646 if (!nft_is_active(net, table))
648 if (nf_tables_fill_table_info(skb, net,
649 NETLINK_CB(cb->skb).portid,
651 NFT_MSG_NEWTABLE, NLM_F_MULTI,
652 table->family, table) < 0)
655 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
665 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
666 const struct nlmsghdr *nlh,
667 struct netlink_dump_control *c)
671 if (!try_module_get(THIS_MODULE))
675 err = netlink_dump_start(nlsk, skb, nlh, c);
677 module_put(THIS_MODULE);
682 /* called with rcu_read_lock held */
683 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
684 struct sk_buff *skb, const struct nlmsghdr *nlh,
685 const struct nlattr * const nla[],
686 struct netlink_ext_ack *extack)
688 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
689 u8 genmask = nft_genmask_cur(net);
690 const struct nft_table *table;
691 struct sk_buff *skb2;
692 int family = nfmsg->nfgen_family;
695 if (nlh->nlmsg_flags & NLM_F_DUMP) {
696 struct netlink_dump_control c = {
697 .dump = nf_tables_dump_tables,
698 .module = THIS_MODULE,
701 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
704 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
706 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
707 return PTR_ERR(table);
710 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
714 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
715 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
720 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
727 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
729 struct nft_chain *chain;
732 list_for_each_entry(chain, &table->chains, list) {
733 if (!nft_is_active_next(net, chain))
735 if (!nft_is_base_chain(chain))
738 if (cnt && i++ == cnt)
741 nf_unregister_net_hook(net, &nft_base_chain(chain)->ops);
745 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
747 struct nft_chain *chain;
750 list_for_each_entry(chain, &table->chains, list) {
751 if (!nft_is_active_next(net, chain))
753 if (!nft_is_base_chain(chain))
756 err = nf_register_net_hook(net, &nft_base_chain(chain)->ops);
765 nft_table_disable(net, table, i);
769 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
771 nft_table_disable(net, table, 0);
774 static int nf_tables_updtable(struct nft_ctx *ctx)
776 struct nft_trans *trans;
780 if (!ctx->nla[NFTA_TABLE_FLAGS])
783 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
784 if (flags & ~NFT_TABLE_F_DORMANT)
787 if (flags == ctx->table->flags)
790 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
791 sizeof(struct nft_trans_table));
795 if ((flags & NFT_TABLE_F_DORMANT) &&
796 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
797 nft_trans_table_enable(trans) = false;
798 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
799 ctx->table->flags & NFT_TABLE_F_DORMANT) {
800 ret = nf_tables_table_enable(ctx->net, ctx->table);
802 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
803 nft_trans_table_enable(trans) = true;
809 nft_trans_table_update(trans) = true;
810 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
813 nft_trans_destroy(trans);
817 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
819 const char *name = data;
821 return jhash(name, strlen(name), seed);
824 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
826 const struct nft_chain *chain = data;
828 return nft_chain_hash(chain->name, 0, seed);
831 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
834 const struct nft_chain *chain = ptr;
835 const char *name = arg->key;
837 return strcmp(chain->name, name);
840 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
842 const struct nft_object_hash_key *k = data;
844 seed ^= hash_ptr(k->table, 32);
846 return jhash(k->name, strlen(k->name), seed);
849 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
851 const struct nft_object *obj = data;
853 return nft_objname_hash(&obj->key, 0, seed);
856 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
859 const struct nft_object_hash_key *k = arg->key;
860 const struct nft_object *obj = ptr;
862 if (obj->key.table != k->table)
865 return strcmp(obj->key.name, k->name);
868 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
869 struct sk_buff *skb, const struct nlmsghdr *nlh,
870 const struct nlattr * const nla[],
871 struct netlink_ext_ack *extack)
873 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
874 u8 genmask = nft_genmask_next(net);
875 int family = nfmsg->nfgen_family;
876 const struct nlattr *attr;
877 struct nft_table *table;
882 lockdep_assert_held(&net->nft.commit_mutex);
883 attr = nla[NFTA_TABLE_NAME];
884 table = nft_table_lookup(net, attr, family, genmask);
886 if (PTR_ERR(table) != -ENOENT)
887 return PTR_ERR(table);
889 if (nlh->nlmsg_flags & NLM_F_EXCL) {
890 NL_SET_BAD_ATTR(extack, attr);
893 if (nlh->nlmsg_flags & NLM_F_REPLACE)
896 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
897 return nf_tables_updtable(&ctx);
900 if (nla[NFTA_TABLE_FLAGS]) {
901 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
902 if (flags & ~NFT_TABLE_F_DORMANT)
907 table = kzalloc(sizeof(*table), GFP_KERNEL);
911 table->name = nla_strdup(attr, GFP_KERNEL);
912 if (table->name == NULL)
915 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
919 INIT_LIST_HEAD(&table->chains);
920 INIT_LIST_HEAD(&table->sets);
921 INIT_LIST_HEAD(&table->objects);
922 INIT_LIST_HEAD(&table->flowtables);
923 table->family = family;
924 table->flags = flags;
925 table->handle = ++table_handle;
927 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
928 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
932 list_add_tail_rcu(&table->list, &net->nft.tables);
935 rhltable_destroy(&table->chains_ht);
944 static int nft_flush_table(struct nft_ctx *ctx)
946 struct nft_flowtable *flowtable, *nft;
947 struct nft_chain *chain, *nc;
948 struct nft_object *obj, *ne;
949 struct nft_set *set, *ns;
952 list_for_each_entry(chain, &ctx->table->chains, list) {
953 if (!nft_is_active_next(ctx->net, chain))
958 err = nft_delrule_by_chain(ctx);
963 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
964 if (!nft_is_active_next(ctx->net, set))
967 if (nft_set_is_anonymous(set) &&
968 !list_empty(&set->bindings))
971 err = nft_delset(ctx, set);
976 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
977 err = nft_delflowtable(ctx, flowtable);
982 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
983 err = nft_delobj(ctx, obj);
988 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
989 if (!nft_is_active_next(ctx->net, chain))
994 err = nft_delchain(ctx);
999 err = nft_deltable(ctx);
1004 static int nft_flush(struct nft_ctx *ctx, int family)
1006 struct nft_table *table, *nt;
1007 const struct nlattr * const *nla = ctx->nla;
1010 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
1011 if (family != AF_UNSPEC && table->family != family)
1014 ctx->family = table->family;
1016 if (!nft_is_active_next(ctx->net, table))
1019 if (nla[NFTA_TABLE_NAME] &&
1020 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1025 err = nft_flush_table(ctx);
1033 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1034 struct sk_buff *skb, const struct nlmsghdr *nlh,
1035 const struct nlattr * const nla[],
1036 struct netlink_ext_ack *extack)
1038 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1039 u8 genmask = nft_genmask_next(net);
1040 int family = nfmsg->nfgen_family;
1041 const struct nlattr *attr;
1042 struct nft_table *table;
1045 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
1046 if (family == AF_UNSPEC ||
1047 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1048 return nft_flush(&ctx, family);
1050 if (nla[NFTA_TABLE_HANDLE]) {
1051 attr = nla[NFTA_TABLE_HANDLE];
1052 table = nft_table_lookup_byhandle(net, attr, genmask);
1054 attr = nla[NFTA_TABLE_NAME];
1055 table = nft_table_lookup(net, attr, family, genmask);
1058 if (IS_ERR(table)) {
1059 NL_SET_BAD_ATTR(extack, attr);
1060 return PTR_ERR(table);
1063 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1067 ctx.family = family;
1070 return nft_flush_table(&ctx);
1073 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1075 if (WARN_ON(ctx->table->use > 0))
1078 rhltable_destroy(&ctx->table->chains_ht);
1079 kfree(ctx->table->name);
1083 void nft_register_chain_type(const struct nft_chain_type *ctype)
1085 if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO))
1088 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1089 if (WARN_ON(chain_type[ctype->family][ctype->type] != NULL)) {
1090 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1093 chain_type[ctype->family][ctype->type] = ctype;
1094 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1096 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1098 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1100 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1101 chain_type[ctype->family][ctype->type] = NULL;
1102 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1104 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1110 static struct nft_chain *
1111 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1113 struct nft_chain *chain;
1115 list_for_each_entry(chain, &table->chains, list) {
1116 if (chain->handle == handle &&
1117 nft_active_genmask(chain, genmask))
1121 return ERR_PTR(-ENOENT);
1124 static bool lockdep_commit_lock_is_held(const struct net *net)
1126 #ifdef CONFIG_PROVE_LOCKING
1127 return lockdep_is_held(&net->nft.commit_mutex);
1133 static struct nft_chain *nft_chain_lookup(struct net *net,
1134 struct nft_table *table,
1135 const struct nlattr *nla, u8 genmask)
1137 char search[NFT_CHAIN_MAXNAMELEN + 1];
1138 struct rhlist_head *tmp, *list;
1139 struct nft_chain *chain;
1142 return ERR_PTR(-EINVAL);
1144 nla_strlcpy(search, nla, sizeof(search));
1146 WARN_ON(!rcu_read_lock_held() &&
1147 !lockdep_commit_lock_is_held(net));
1149 chain = ERR_PTR(-ENOENT);
1151 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1155 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1156 if (nft_active_genmask(chain, genmask))
1159 chain = ERR_PTR(-ENOENT);
1165 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1166 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1167 .len = NFT_TABLE_MAXNAMELEN - 1 },
1168 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1169 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1170 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1171 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1172 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1173 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
1174 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1177 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1178 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1179 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1180 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1181 .len = IFNAMSIZ - 1 },
1184 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1186 struct nft_stats *cpu_stats, total;
1187 struct nlattr *nest;
1195 memset(&total, 0, sizeof(total));
1196 for_each_possible_cpu(cpu) {
1197 cpu_stats = per_cpu_ptr(stats, cpu);
1199 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1200 pkts = cpu_stats->pkts;
1201 bytes = cpu_stats->bytes;
1202 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1204 total.bytes += bytes;
1206 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1208 goto nla_put_failure;
1210 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1211 NFTA_COUNTER_PAD) ||
1212 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1214 goto nla_put_failure;
1216 nla_nest_end(skb, nest);
1223 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1224 u32 portid, u32 seq, int event, u32 flags,
1225 int family, const struct nft_table *table,
1226 const struct nft_chain *chain)
1228 struct nlmsghdr *nlh;
1229 struct nfgenmsg *nfmsg;
1231 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1232 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1234 goto nla_put_failure;
1236 nfmsg = nlmsg_data(nlh);
1237 nfmsg->nfgen_family = family;
1238 nfmsg->version = NFNETLINK_V0;
1239 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1241 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1242 goto nla_put_failure;
1243 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1245 goto nla_put_failure;
1246 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1247 goto nla_put_failure;
1249 if (nft_is_base_chain(chain)) {
1250 const struct nft_base_chain *basechain = nft_base_chain(chain);
1251 const struct nf_hook_ops *ops = &basechain->ops;
1252 struct nft_stats __percpu *stats;
1253 struct nlattr *nest;
1255 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1257 goto nla_put_failure;
1258 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1259 goto nla_put_failure;
1260 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1261 goto nla_put_failure;
1262 if (basechain->dev_name[0] &&
1263 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1264 goto nla_put_failure;
1265 nla_nest_end(skb, nest);
1267 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1268 htonl(basechain->policy)))
1269 goto nla_put_failure;
1271 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1272 goto nla_put_failure;
1274 stats = rcu_dereference_check(basechain->stats,
1275 lockdep_commit_lock_is_held(net));
1276 if (nft_dump_stats(skb, stats))
1277 goto nla_put_failure;
1280 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1281 goto nla_put_failure;
1283 nlmsg_end(skb, nlh);
1287 nlmsg_trim(skb, nlh);
1291 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1293 struct sk_buff *skb;
1297 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1300 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1304 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1305 event, 0, ctx->family, ctx->table,
1312 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1313 ctx->report, GFP_KERNEL);
1316 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1319 static int nf_tables_dump_chains(struct sk_buff *skb,
1320 struct netlink_callback *cb)
1322 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1323 const struct nft_table *table;
1324 const struct nft_chain *chain;
1325 unsigned int idx = 0, s_idx = cb->args[0];
1326 struct net *net = sock_net(skb->sk);
1327 int family = nfmsg->nfgen_family;
1330 cb->seq = net->nft.base_seq;
1332 list_for_each_entry_rcu(table, &net->nft.tables, list) {
1333 if (family != NFPROTO_UNSPEC && family != table->family)
1336 list_for_each_entry_rcu(chain, &table->chains, list) {
1340 memset(&cb->args[1], 0,
1341 sizeof(cb->args) - sizeof(cb->args[0]));
1342 if (!nft_is_active(net, chain))
1344 if (nf_tables_fill_chain_info(skb, net,
1345 NETLINK_CB(cb->skb).portid,
1349 table->family, table,
1353 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1364 /* called with rcu_read_lock held */
1365 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1366 struct sk_buff *skb, const struct nlmsghdr *nlh,
1367 const struct nlattr * const nla[],
1368 struct netlink_ext_ack *extack)
1370 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1371 u8 genmask = nft_genmask_cur(net);
1372 const struct nft_chain *chain;
1373 struct nft_table *table;
1374 struct sk_buff *skb2;
1375 int family = nfmsg->nfgen_family;
1378 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1379 struct netlink_dump_control c = {
1380 .dump = nf_tables_dump_chains,
1381 .module = THIS_MODULE,
1384 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1387 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1388 if (IS_ERR(table)) {
1389 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1390 return PTR_ERR(table);
1393 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1394 if (IS_ERR(chain)) {
1395 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1396 return PTR_ERR(chain);
1399 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1403 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1404 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1405 family, table, chain);
1409 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1416 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1417 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1418 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1421 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1423 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1424 struct nft_stats __percpu *newstats;
1425 struct nft_stats *stats;
1428 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1429 nft_counter_policy, NULL);
1431 return ERR_PTR(err);
1433 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1434 return ERR_PTR(-EINVAL);
1436 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1437 if (newstats == NULL)
1438 return ERR_PTR(-ENOMEM);
1440 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1441 * are not exposed to userspace.
1444 stats = this_cpu_ptr(newstats);
1445 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1446 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1452 static void nft_chain_stats_replace(struct net *net,
1453 struct nft_base_chain *chain,
1454 struct nft_stats __percpu *newstats)
1456 struct nft_stats __percpu *oldstats;
1458 if (newstats == NULL)
1461 if (rcu_access_pointer(chain->stats)) {
1462 oldstats = rcu_dereference_protected(chain->stats,
1463 lockdep_commit_lock_is_held(net));
1464 rcu_assign_pointer(chain->stats, newstats);
1466 free_percpu(oldstats);
1468 rcu_assign_pointer(chain->stats, newstats);
1469 static_branch_inc(&nft_counters_enabled);
1473 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1475 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1476 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1482 /* should be NULL either via abort or via successful commit */
1483 WARN_ON_ONCE(chain->rules_next);
1484 kvfree(chain->rules_next);
1487 static void nf_tables_chain_destroy(struct nft_ctx *ctx)
1489 struct nft_chain *chain = ctx->chain;
1491 if (WARN_ON(chain->use > 0))
1494 /* no concurrent access possible anymore */
1495 nf_tables_chain_free_chain_rules(chain);
1497 if (nft_is_base_chain(chain)) {
1498 struct nft_base_chain *basechain = nft_base_chain(chain);
1500 module_put(basechain->type->owner);
1501 if (rcu_access_pointer(basechain->stats)) {
1502 static_branch_dec(&nft_counters_enabled);
1503 free_percpu(rcu_dereference_raw(basechain->stats));
1513 struct nft_chain_hook {
1516 const struct nft_chain_type *type;
1517 struct net_device *dev;
1520 static int nft_chain_parse_hook(struct net *net,
1521 const struct nlattr * const nla[],
1522 struct nft_chain_hook *hook, u8 family,
1525 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1526 const struct nft_chain_type *type;
1527 struct net_device *dev;
1530 lockdep_assert_held(&net->nft.commit_mutex);
1531 lockdep_nfnl_nft_mutex_not_held();
1533 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1534 nla[NFTA_CHAIN_HOOK],
1535 nft_hook_policy, NULL);
1539 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1540 ha[NFTA_HOOK_PRIORITY] == NULL)
1543 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1544 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1546 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1547 if (nla[NFTA_CHAIN_TYPE]) {
1548 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1551 return PTR_ERR(type);
1553 if (hook->num > NF_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1556 if (type->type == NFT_CHAIN_T_NAT &&
1557 hook->priority <= NF_IP_PRI_CONNTRACK)
1560 if (!try_module_get(type->owner))
1566 if (family == NFPROTO_NETDEV) {
1567 char ifname[IFNAMSIZ];
1569 if (!ha[NFTA_HOOK_DEV]) {
1570 module_put(type->owner);
1574 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1575 dev = __dev_get_by_name(net, ifname);
1577 module_put(type->owner);
1581 } else if (ha[NFTA_HOOK_DEV]) {
1582 module_put(type->owner);
1589 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1591 module_put(hook->type->owner);
1594 struct nft_rules_old {
1596 struct nft_rule **start;
1599 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1602 if (alloc > INT_MAX)
1605 alloc += 1; /* NULL, ends rules */
1606 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1609 alloc *= sizeof(struct nft_rule *);
1610 alloc += sizeof(struct nft_rules_old);
1612 return kvmalloc(alloc, GFP_KERNEL);
1615 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1618 const struct nlattr * const *nla = ctx->nla;
1619 struct nft_table *table = ctx->table;
1620 struct nft_base_chain *basechain;
1621 struct nft_stats __percpu *stats;
1622 struct net *net = ctx->net;
1623 struct nft_trans *trans;
1624 struct nft_chain *chain;
1625 struct nft_rule **rules;
1628 if (table->use == UINT_MAX)
1631 if (nla[NFTA_CHAIN_HOOK]) {
1632 struct nft_chain_hook hook;
1633 struct nf_hook_ops *ops;
1635 err = nft_chain_parse_hook(net, nla, &hook, family, true);
1639 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1640 if (basechain == NULL) {
1641 nft_chain_release_hook(&hook);
1645 if (hook.dev != NULL)
1646 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1648 if (nla[NFTA_CHAIN_COUNTERS]) {
1649 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1650 if (IS_ERR(stats)) {
1651 nft_chain_release_hook(&hook);
1653 return PTR_ERR(stats);
1655 rcu_assign_pointer(basechain->stats, stats);
1656 static_branch_inc(&nft_counters_enabled);
1659 basechain->type = hook.type;
1660 chain = &basechain->chain;
1662 ops = &basechain->ops;
1664 ops->hooknum = hook.num;
1665 ops->priority = hook.priority;
1667 ops->hook = hook.type->hooks[ops->hooknum];
1668 ops->dev = hook.dev;
1670 chain->flags |= NFT_BASE_CHAIN;
1671 basechain->policy = NF_ACCEPT;
1673 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1679 INIT_LIST_HEAD(&chain->rules);
1680 chain->handle = nf_tables_alloc_handle(table);
1681 chain->table = table;
1682 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1688 rules = nf_tables_chain_alloc_rules(chain, 0);
1695 rcu_assign_pointer(chain->rules_gen_0, rules);
1696 rcu_assign_pointer(chain->rules_gen_1, rules);
1698 err = nf_tables_register_hook(net, table, chain);
1702 err = rhltable_insert_key(&table->chains_ht, chain->name,
1703 &chain->rhlhead, nft_chain_ht_params);
1707 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1708 if (IS_ERR(trans)) {
1709 err = PTR_ERR(trans);
1710 rhltable_remove(&table->chains_ht, &chain->rhlhead,
1711 nft_chain_ht_params);
1715 nft_trans_chain_policy(trans) = -1;
1716 if (nft_is_base_chain(chain))
1717 nft_trans_chain_policy(trans) = policy;
1720 list_add_tail_rcu(&chain->list, &table->chains);
1724 nf_tables_unregister_hook(net, table, chain);
1726 nf_tables_chain_destroy(ctx);
1731 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy)
1733 const struct nlattr * const *nla = ctx->nla;
1734 struct nft_table *table = ctx->table;
1735 struct nft_chain *chain = ctx->chain;
1736 struct nft_base_chain *basechain;
1737 struct nft_stats *stats = NULL;
1738 struct nft_chain_hook hook;
1739 struct nf_hook_ops *ops;
1740 struct nft_trans *trans;
1743 if (nla[NFTA_CHAIN_HOOK]) {
1744 if (!nft_is_base_chain(chain))
1747 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
1752 basechain = nft_base_chain(chain);
1753 if (basechain->type != hook.type) {
1754 nft_chain_release_hook(&hook);
1758 ops = &basechain->ops;
1759 if (ops->hooknum != hook.num ||
1760 ops->priority != hook.priority ||
1761 ops->dev != hook.dev) {
1762 nft_chain_release_hook(&hook);
1765 nft_chain_release_hook(&hook);
1768 if (nla[NFTA_CHAIN_HANDLE] &&
1769 nla[NFTA_CHAIN_NAME]) {
1770 struct nft_chain *chain2;
1772 chain2 = nft_chain_lookup(ctx->net, table,
1773 nla[NFTA_CHAIN_NAME], genmask);
1774 if (!IS_ERR(chain2))
1778 if (nla[NFTA_CHAIN_COUNTERS]) {
1779 if (!nft_is_base_chain(chain))
1782 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1784 return PTR_ERR(stats);
1788 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
1789 sizeof(struct nft_trans_chain));
1793 nft_trans_chain_stats(trans) = stats;
1794 nft_trans_chain_update(trans) = true;
1796 if (nla[NFTA_CHAIN_POLICY])
1797 nft_trans_chain_policy(trans) = policy;
1799 nft_trans_chain_policy(trans) = -1;
1801 if (nla[NFTA_CHAIN_HANDLE] &&
1802 nla[NFTA_CHAIN_NAME]) {
1803 struct nft_trans *tmp;
1807 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1812 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
1813 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
1814 tmp->ctx.table == table &&
1815 nft_trans_chain_update(tmp) &&
1816 nft_trans_chain_name(tmp) &&
1817 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
1823 nft_trans_chain_name(trans) = name;
1825 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1834 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1835 struct sk_buff *skb, const struct nlmsghdr *nlh,
1836 const struct nlattr * const nla[],
1837 struct netlink_ext_ack *extack)
1839 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1840 u8 genmask = nft_genmask_next(net);
1841 int family = nfmsg->nfgen_family;
1842 const struct nlattr *attr;
1843 struct nft_table *table;
1844 struct nft_chain *chain;
1845 u8 policy = NF_ACCEPT;
1849 lockdep_assert_held(&net->nft.commit_mutex);
1851 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1852 if (IS_ERR(table)) {
1853 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1854 return PTR_ERR(table);
1858 attr = nla[NFTA_CHAIN_NAME];
1860 if (nla[NFTA_CHAIN_HANDLE]) {
1861 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1862 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1863 if (IS_ERR(chain)) {
1864 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
1865 return PTR_ERR(chain);
1867 attr = nla[NFTA_CHAIN_HANDLE];
1869 chain = nft_chain_lookup(net, table, attr, genmask);
1870 if (IS_ERR(chain)) {
1871 if (PTR_ERR(chain) != -ENOENT) {
1872 NL_SET_BAD_ATTR(extack, attr);
1873 return PTR_ERR(chain);
1879 if (nla[NFTA_CHAIN_POLICY]) {
1880 if (chain != NULL &&
1881 !nft_is_base_chain(chain)) {
1882 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1886 if (chain == NULL &&
1887 nla[NFTA_CHAIN_HOOK] == NULL) {
1888 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1892 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1902 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1904 if (chain != NULL) {
1905 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1906 NL_SET_BAD_ATTR(extack, attr);
1909 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1912 return nf_tables_updchain(&ctx, genmask, policy);
1915 return nf_tables_addchain(&ctx, family, genmask, policy);
1918 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1919 struct sk_buff *skb, const struct nlmsghdr *nlh,
1920 const struct nlattr * const nla[],
1921 struct netlink_ext_ack *extack)
1923 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1924 u8 genmask = nft_genmask_next(net);
1925 int family = nfmsg->nfgen_family;
1926 const struct nlattr *attr;
1927 struct nft_table *table;
1928 struct nft_chain *chain;
1929 struct nft_rule *rule;
1935 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1936 if (IS_ERR(table)) {
1937 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1938 return PTR_ERR(table);
1941 if (nla[NFTA_CHAIN_HANDLE]) {
1942 attr = nla[NFTA_CHAIN_HANDLE];
1943 handle = be64_to_cpu(nla_get_be64(attr));
1944 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1946 attr = nla[NFTA_CHAIN_NAME];
1947 chain = nft_chain_lookup(net, table, attr, genmask);
1949 if (IS_ERR(chain)) {
1950 NL_SET_BAD_ATTR(extack, attr);
1951 return PTR_ERR(chain);
1954 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1958 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1961 list_for_each_entry(rule, &chain->rules, list) {
1962 if (!nft_is_active_next(net, rule))
1966 err = nft_delrule(&ctx, rule);
1971 /* There are rules and elements that are still holding references to us,
1972 * we cannot do a recursive removal in this case.
1975 NL_SET_BAD_ATTR(extack, attr);
1979 return nft_delchain(&ctx);
1987 * nft_register_expr - register nf_tables expr type
1990 * Registers the expr type for use with nf_tables. Returns zero on
1991 * success or a negative errno code otherwise.
1993 int nft_register_expr(struct nft_expr_type *type)
1995 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1996 if (type->family == NFPROTO_UNSPEC)
1997 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1999 list_add_rcu(&type->list, &nf_tables_expressions);
2000 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2003 EXPORT_SYMBOL_GPL(nft_register_expr);
2006 * nft_unregister_expr - unregister nf_tables expr type
2009 * Unregisters the expr typefor use with nf_tables.
2011 void nft_unregister_expr(struct nft_expr_type *type)
2013 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2014 list_del_rcu(&type->list);
2015 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2017 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2019 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2022 const struct nft_expr_type *type;
2024 list_for_each_entry(type, &nf_tables_expressions, list) {
2025 if (!nla_strcmp(nla, type->name) &&
2026 (!type->family || type->family == family))
2032 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2036 const struct nft_expr_type *type;
2039 return ERR_PTR(-EINVAL);
2041 type = __nft_expr_type_get(family, nla);
2042 if (type != NULL && try_module_get(type->owner))
2045 lockdep_nfnl_nft_mutex_not_held();
2046 #ifdef CONFIG_MODULES
2048 nft_request_module(net, "nft-expr-%u-%.*s", family,
2049 nla_len(nla), (char *)nla_data(nla));
2050 if (__nft_expr_type_get(family, nla))
2051 return ERR_PTR(-EAGAIN);
2053 nft_request_module(net, "nft-expr-%.*s",
2054 nla_len(nla), (char *)nla_data(nla));
2055 if (__nft_expr_type_get(family, nla))
2056 return ERR_PTR(-EAGAIN);
2059 return ERR_PTR(-ENOENT);
2062 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2063 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
2064 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2067 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2068 const struct nft_expr *expr)
2070 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2071 goto nla_put_failure;
2073 if (expr->ops->dump) {
2074 struct nlattr *data = nla_nest_start_noflag(skb,
2077 goto nla_put_failure;
2078 if (expr->ops->dump(skb, expr) < 0)
2079 goto nla_put_failure;
2080 nla_nest_end(skb, data);
2089 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2090 const struct nft_expr *expr)
2092 struct nlattr *nest;
2094 nest = nla_nest_start_noflag(skb, attr);
2096 goto nla_put_failure;
2097 if (nf_tables_fill_expr_info(skb, expr) < 0)
2098 goto nla_put_failure;
2099 nla_nest_end(skb, nest);
2106 struct nft_expr_info {
2107 const struct nft_expr_ops *ops;
2108 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2111 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2112 const struct nlattr *nla,
2113 struct nft_expr_info *info)
2115 const struct nft_expr_type *type;
2116 const struct nft_expr_ops *ops;
2117 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2120 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2121 nft_expr_policy, NULL);
2125 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2127 return PTR_ERR(type);
2129 if (tb[NFTA_EXPR_DATA]) {
2130 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2132 type->policy, NULL);
2136 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2138 if (type->select_ops != NULL) {
2139 ops = type->select_ops(ctx,
2140 (const struct nlattr * const *)info->tb);
2152 module_put(type->owner);
2156 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2157 const struct nft_expr_info *info,
2158 struct nft_expr *expr)
2160 const struct nft_expr_ops *ops = info->ops;
2165 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2176 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2177 struct nft_expr *expr)
2179 const struct nft_expr_type *type = expr->ops->type;
2181 if (expr->ops->destroy)
2182 expr->ops->destroy(ctx, expr);
2183 module_put(type->owner);
2186 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2187 const struct nlattr *nla)
2189 struct nft_expr_info info;
2190 struct nft_expr *expr;
2191 struct module *owner;
2194 err = nf_tables_expr_parse(ctx, nla, &info);
2199 expr = kzalloc(info.ops->size, GFP_KERNEL);
2203 err = nf_tables_newexpr(ctx, &info, expr);
2211 owner = info.ops->type->owner;
2212 if (info.ops->type->release_ops)
2213 info.ops->type->release_ops(info.ops);
2217 return ERR_PTR(err);
2220 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2222 nf_tables_expr_destroy(ctx, expr);
2230 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2233 struct nft_rule *rule;
2235 // FIXME: this sucks
2236 list_for_each_entry_rcu(rule, &chain->rules, list) {
2237 if (handle == rule->handle)
2241 return ERR_PTR(-ENOENT);
2244 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2245 const struct nlattr *nla)
2248 return ERR_PTR(-EINVAL);
2250 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2253 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2254 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2255 .len = NFT_TABLE_MAXNAMELEN - 1 },
2256 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2257 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2258 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2259 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2260 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2261 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2262 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2263 .len = NFT_USERDATA_MAXLEN },
2264 [NFTA_RULE_ID] = { .type = NLA_U32 },
2265 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2268 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2269 u32 portid, u32 seq, int event,
2270 u32 flags, int family,
2271 const struct nft_table *table,
2272 const struct nft_chain *chain,
2273 const struct nft_rule *rule,
2274 const struct nft_rule *prule)
2276 struct nlmsghdr *nlh;
2277 struct nfgenmsg *nfmsg;
2278 const struct nft_expr *expr, *next;
2279 struct nlattr *list;
2280 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2282 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2284 goto nla_put_failure;
2286 nfmsg = nlmsg_data(nlh);
2287 nfmsg->nfgen_family = family;
2288 nfmsg->version = NFNETLINK_V0;
2289 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
2291 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2292 goto nla_put_failure;
2293 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2294 goto nla_put_failure;
2295 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2297 goto nla_put_failure;
2299 if (event != NFT_MSG_DELRULE && prule) {
2300 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2301 cpu_to_be64(prule->handle),
2303 goto nla_put_failure;
2306 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2308 goto nla_put_failure;
2309 nft_rule_for_each_expr(expr, next, rule) {
2310 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2311 goto nla_put_failure;
2313 nla_nest_end(skb, list);
2316 struct nft_userdata *udata = nft_userdata(rule);
2317 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2319 goto nla_put_failure;
2322 nlmsg_end(skb, nlh);
2326 nlmsg_trim(skb, nlh);
2330 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2331 const struct nft_rule *rule, int event)
2333 struct sk_buff *skb;
2337 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2340 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2344 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2345 event, 0, ctx->family, ctx->table,
2346 ctx->chain, rule, NULL);
2352 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2353 ctx->report, GFP_KERNEL);
2356 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2359 struct nft_rule_dump_ctx {
2364 static int __nf_tables_dump_rules(struct sk_buff *skb,
2366 struct netlink_callback *cb,
2367 const struct nft_table *table,
2368 const struct nft_chain *chain)
2370 struct net *net = sock_net(skb->sk);
2371 const struct nft_rule *rule, *prule;
2372 unsigned int s_idx = cb->args[0];
2375 list_for_each_entry_rcu(rule, &chain->rules, list) {
2376 if (!nft_is_active(net, rule))
2381 memset(&cb->args[1], 0,
2382 sizeof(cb->args) - sizeof(cb->args[0]));
2384 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2387 NLM_F_MULTI | NLM_F_APPEND,
2389 table, chain, rule, prule) < 0)
2392 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2401 static int nf_tables_dump_rules(struct sk_buff *skb,
2402 struct netlink_callback *cb)
2404 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2405 const struct nft_rule_dump_ctx *ctx = cb->data;
2406 struct nft_table *table;
2407 const struct nft_chain *chain;
2408 unsigned int idx = 0;
2409 struct net *net = sock_net(skb->sk);
2410 int family = nfmsg->nfgen_family;
2413 cb->seq = net->nft.base_seq;
2415 list_for_each_entry_rcu(table, &net->nft.tables, list) {
2416 if (family != NFPROTO_UNSPEC && family != table->family)
2419 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2422 if (ctx && ctx->table && ctx->chain) {
2423 struct rhlist_head *list, *tmp;
2425 list = rhltable_lookup(&table->chains_ht, ctx->chain,
2426 nft_chain_ht_params);
2430 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2431 if (!nft_is_active(net, chain))
2433 __nf_tables_dump_rules(skb, &idx,
2440 list_for_each_entry_rcu(chain, &table->chains, list) {
2441 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2445 if (ctx && ctx->table)
2455 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2457 const struct nlattr * const *nla = cb->data;
2458 struct nft_rule_dump_ctx *ctx = NULL;
2460 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2461 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2465 if (nla[NFTA_RULE_TABLE]) {
2466 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2473 if (nla[NFTA_RULE_CHAIN]) {
2474 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2488 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2490 struct nft_rule_dump_ctx *ctx = cb->data;
2500 /* called with rcu_read_lock held */
2501 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2502 struct sk_buff *skb, const struct nlmsghdr *nlh,
2503 const struct nlattr * const nla[],
2504 struct netlink_ext_ack *extack)
2506 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2507 u8 genmask = nft_genmask_cur(net);
2508 const struct nft_chain *chain;
2509 const struct nft_rule *rule;
2510 struct nft_table *table;
2511 struct sk_buff *skb2;
2512 int family = nfmsg->nfgen_family;
2515 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2516 struct netlink_dump_control c = {
2517 .start= nf_tables_dump_rules_start,
2518 .dump = nf_tables_dump_rules,
2519 .done = nf_tables_dump_rules_done,
2520 .module = THIS_MODULE,
2521 .data = (void *)nla,
2524 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
2527 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2528 if (IS_ERR(table)) {
2529 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2530 return PTR_ERR(table);
2533 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2534 if (IS_ERR(chain)) {
2535 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2536 return PTR_ERR(chain);
2539 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2541 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2542 return PTR_ERR(rule);
2545 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
2549 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2550 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2551 family, table, chain, rule, NULL);
2555 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2562 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2563 struct nft_rule *rule)
2565 struct nft_expr *expr, *next;
2568 * Careful: some expressions might not be initialized in case this
2569 * is called on error from nf_tables_newrule().
2571 expr = nft_expr_first(rule);
2572 while (expr != nft_expr_last(rule) && expr->ops) {
2573 next = nft_expr_next(expr);
2574 nf_tables_expr_destroy(ctx, expr);
2580 static void nf_tables_rule_release(const struct nft_ctx *ctx,
2581 struct nft_rule *rule)
2583 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
2584 nf_tables_rule_destroy(ctx, rule);
2587 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
2589 struct nft_expr *expr, *last;
2590 const struct nft_data *data;
2591 struct nft_rule *rule;
2594 if (ctx->level == NFT_JUMP_STACK_SIZE)
2597 list_for_each_entry(rule, &chain->rules, list) {
2598 if (!nft_is_active_next(ctx->net, rule))
2601 nft_rule_for_each_expr(expr, last, rule) {
2602 if (!expr->ops->validate)
2605 err = expr->ops->validate(ctx, expr, &data);
2613 EXPORT_SYMBOL_GPL(nft_chain_validate);
2615 static int nft_table_validate(struct net *net, const struct nft_table *table)
2617 struct nft_chain *chain;
2618 struct nft_ctx ctx = {
2620 .family = table->family,
2624 list_for_each_entry(chain, &table->chains, list) {
2625 if (!nft_is_base_chain(chain))
2629 err = nft_chain_validate(&ctx, chain);
2637 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2638 const struct nlattr *nla);
2640 #define NFT_RULE_MAXEXPRS 128
2642 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2643 struct sk_buff *skb, const struct nlmsghdr *nlh,
2644 const struct nlattr * const nla[],
2645 struct netlink_ext_ack *extack)
2647 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2648 u8 genmask = nft_genmask_next(net);
2649 struct nft_expr_info *info = NULL;
2650 int family = nfmsg->nfgen_family;
2651 struct nft_table *table;
2652 struct nft_chain *chain;
2653 struct nft_rule *rule, *old_rule = NULL;
2654 struct nft_userdata *udata;
2655 struct nft_trans *trans = NULL;
2656 struct nft_expr *expr;
2659 unsigned int size, i, n, ulen = 0, usize = 0;
2661 u64 handle, pos_handle;
2663 lockdep_assert_held(&net->nft.commit_mutex);
2665 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2666 if (IS_ERR(table)) {
2667 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2668 return PTR_ERR(table);
2671 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2672 if (IS_ERR(chain)) {
2673 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2674 return PTR_ERR(chain);
2677 if (nla[NFTA_RULE_HANDLE]) {
2678 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2679 rule = __nft_rule_lookup(chain, handle);
2681 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2682 return PTR_ERR(rule);
2685 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2686 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2689 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2694 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
2695 nlh->nlmsg_flags & NLM_F_REPLACE)
2697 handle = nf_tables_alloc_handle(table);
2699 if (chain->use == UINT_MAX)
2702 if (nla[NFTA_RULE_POSITION]) {
2703 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2704 old_rule = __nft_rule_lookup(chain, pos_handle);
2705 if (IS_ERR(old_rule)) {
2706 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
2707 return PTR_ERR(old_rule);
2709 } else if (nla[NFTA_RULE_POSITION_ID]) {
2710 old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
2711 if (IS_ERR(old_rule)) {
2712 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
2713 return PTR_ERR(old_rule);
2718 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2722 if (nla[NFTA_RULE_EXPRESSIONS]) {
2723 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
2724 sizeof(struct nft_expr_info),
2729 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2731 if (nla_type(tmp) != NFTA_LIST_ELEM)
2733 if (n == NFT_RULE_MAXEXPRS)
2735 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2738 size += info[n].ops->size;
2742 /* Check for overflow of dlen field */
2744 if (size >= 1 << 12)
2747 if (nla[NFTA_RULE_USERDATA]) {
2748 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2750 usize = sizeof(struct nft_userdata) + ulen;
2754 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2758 nft_activate_next(net, rule);
2760 rule->handle = handle;
2762 rule->udata = ulen ? 1 : 0;
2765 udata = nft_userdata(rule);
2766 udata->len = ulen - 1;
2767 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2770 expr = nft_expr_first(rule);
2771 for (i = 0; i < n; i++) {
2772 err = nf_tables_newexpr(&ctx, &info[i], expr);
2776 if (info[i].ops->validate)
2777 nft_validate_state_update(net, NFT_VALIDATE_NEED);
2780 expr = nft_expr_next(expr);
2783 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2784 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
2785 if (trans == NULL) {
2789 err = nft_delrule(&ctx, old_rule);
2791 nft_trans_destroy(trans);
2795 list_add_tail_rcu(&rule->list, &old_rule->list);
2797 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2802 if (nlh->nlmsg_flags & NLM_F_APPEND) {
2804 list_add_rcu(&rule->list, &old_rule->list);
2806 list_add_tail_rcu(&rule->list, &chain->rules);
2809 list_add_tail_rcu(&rule->list, &old_rule->list);
2811 list_add_rcu(&rule->list, &chain->rules);
2817 if (net->nft.validate_state == NFT_VALIDATE_DO)
2818 return nft_table_validate(net, table);
2822 nf_tables_rule_release(&ctx, rule);
2824 for (i = 0; i < n; i++) {
2826 module_put(info[i].ops->type->owner);
2827 if (info[i].ops->type->release_ops)
2828 info[i].ops->type->release_ops(info[i].ops);
2835 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2836 const struct nlattr *nla)
2838 u32 id = ntohl(nla_get_be32(nla));
2839 struct nft_trans *trans;
2841 list_for_each_entry(trans, &net->nft.commit_list, list) {
2842 struct nft_rule *rule = nft_trans_rule(trans);
2844 if (trans->msg_type == NFT_MSG_NEWRULE &&
2845 id == nft_trans_rule_id(trans))
2848 return ERR_PTR(-ENOENT);
2851 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2852 struct sk_buff *skb, const struct nlmsghdr *nlh,
2853 const struct nlattr * const nla[],
2854 struct netlink_ext_ack *extack)
2856 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2857 u8 genmask = nft_genmask_next(net);
2858 struct nft_table *table;
2859 struct nft_chain *chain = NULL;
2860 struct nft_rule *rule;
2861 int family = nfmsg->nfgen_family, err = 0;
2864 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2865 if (IS_ERR(table)) {
2866 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2867 return PTR_ERR(table);
2870 if (nla[NFTA_RULE_CHAIN]) {
2871 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
2873 if (IS_ERR(chain)) {
2874 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2875 return PTR_ERR(chain);
2879 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2882 if (nla[NFTA_RULE_HANDLE]) {
2883 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2885 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2886 return PTR_ERR(rule);
2889 err = nft_delrule(&ctx, rule);
2890 } else if (nla[NFTA_RULE_ID]) {
2891 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2893 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
2894 return PTR_ERR(rule);
2897 err = nft_delrule(&ctx, rule);
2899 err = nft_delrule_by_chain(&ctx);
2902 list_for_each_entry(chain, &table->chains, list) {
2903 if (!nft_is_active_next(net, chain))
2907 err = nft_delrule_by_chain(&ctx);
2920 static LIST_HEAD(nf_tables_set_types);
2922 int nft_register_set(struct nft_set_type *type)
2924 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2925 list_add_tail_rcu(&type->list, &nf_tables_set_types);
2926 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2929 EXPORT_SYMBOL_GPL(nft_register_set);
2931 void nft_unregister_set(struct nft_set_type *type)
2933 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2934 list_del_rcu(&type->list);
2935 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2937 EXPORT_SYMBOL_GPL(nft_unregister_set);
2939 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
2940 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
2943 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
2945 return (flags & type->features) == (flags & NFT_SET_FEATURES);
2949 * Select a set implementation based on the data characteristics and the
2950 * given policy. The total memory use might not be known if no size is
2951 * given, in that case the amount of memory per element is used.
2953 static const struct nft_set_ops *
2954 nft_select_set_ops(const struct nft_ctx *ctx,
2955 const struct nlattr * const nla[],
2956 const struct nft_set_desc *desc,
2957 enum nft_set_policies policy)
2959 const struct nft_set_ops *ops, *bops;
2960 struct nft_set_estimate est, best;
2961 const struct nft_set_type *type;
2964 lockdep_assert_held(&ctx->net->nft.commit_mutex);
2965 lockdep_nfnl_nft_mutex_not_held();
2966 #ifdef CONFIG_MODULES
2967 if (list_empty(&nf_tables_set_types)) {
2968 nft_request_module(ctx->net, "nft-set");
2969 if (!list_empty(&nf_tables_set_types))
2970 return ERR_PTR(-EAGAIN);
2973 if (nla[NFTA_SET_FLAGS] != NULL)
2974 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2981 list_for_each_entry(type, &nf_tables_set_types, list) {
2984 if (!nft_set_ops_candidate(type, flags))
2986 if (!ops->estimate(desc, flags, &est))
2990 case NFT_SET_POL_PERFORMANCE:
2991 if (est.lookup < best.lookup)
2993 if (est.lookup == best.lookup &&
2994 est.space < best.space)
2997 case NFT_SET_POL_MEMORY:
2999 if (est.space < best.space)
3001 if (est.space == best.space &&
3002 est.lookup < best.lookup)
3004 } else if (est.size < best.size || !bops) {
3012 if (!try_module_get(type->owner))
3015 module_put(to_set_type(bops)->owner);
3024 return ERR_PTR(-EOPNOTSUPP);
3027 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3028 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3029 .len = NFT_TABLE_MAXNAMELEN - 1 },
3030 [NFTA_SET_NAME] = { .type = NLA_STRING,
3031 .len = NFT_SET_MAXNAMELEN - 1 },
3032 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3033 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3034 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3035 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3036 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
3037 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3038 [NFTA_SET_DESC] = { .type = NLA_NESTED },
3039 [NFTA_SET_ID] = { .type = NLA_U32 },
3040 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3041 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
3042 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3043 .len = NFT_USERDATA_MAXLEN },
3044 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3045 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
3048 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3049 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
3052 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
3053 const struct sk_buff *skb,
3054 const struct nlmsghdr *nlh,
3055 const struct nlattr * const nla[],
3056 struct netlink_ext_ack *extack,
3059 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3060 int family = nfmsg->nfgen_family;
3061 struct nft_table *table = NULL;
3063 if (nla[NFTA_SET_TABLE] != NULL) {
3064 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3066 if (IS_ERR(table)) {
3067 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3068 return PTR_ERR(table);
3072 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3076 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3077 const struct nlattr *nla, u8 genmask)
3079 struct nft_set *set;
3082 return ERR_PTR(-EINVAL);
3084 list_for_each_entry_rcu(set, &table->sets, list) {
3085 if (!nla_strcmp(nla, set->name) &&
3086 nft_active_genmask(set, genmask))
3089 return ERR_PTR(-ENOENT);
3092 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3093 const struct nlattr *nla,
3096 struct nft_set *set;
3098 list_for_each_entry(set, &table->sets, list) {
3099 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3100 nft_active_genmask(set, genmask))
3103 return ERR_PTR(-ENOENT);
3106 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3107 const struct nlattr *nla, u8 genmask)
3109 struct nft_trans *trans;
3110 u32 id = ntohl(nla_get_be32(nla));
3112 list_for_each_entry(trans, &net->nft.commit_list, list) {
3113 if (trans->msg_type == NFT_MSG_NEWSET) {
3114 struct nft_set *set = nft_trans_set(trans);
3116 if (id == nft_trans_set_id(trans) &&
3117 nft_active_genmask(set, genmask))
3121 return ERR_PTR(-ENOENT);
3124 struct nft_set *nft_set_lookup_global(const struct net *net,
3125 const struct nft_table *table,
3126 const struct nlattr *nla_set_name,
3127 const struct nlattr *nla_set_id,
3130 struct nft_set *set;
3132 set = nft_set_lookup(table, nla_set_name, genmask);
3137 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3141 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3143 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3146 const struct nft_set *i;
3148 unsigned long *inuse;
3149 unsigned int n = 0, min = 0;
3151 p = strchr(name, '%');
3153 if (p[1] != 'd' || strchr(p + 2, '%'))
3156 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3160 list_for_each_entry(i, &ctx->table->sets, list) {
3163 if (!nft_is_active_next(ctx->net, set))
3165 if (!sscanf(i->name, name, &tmp))
3167 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3170 set_bit(tmp - min, inuse);
3173 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3174 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3175 min += BITS_PER_BYTE * PAGE_SIZE;
3176 memset(inuse, 0, PAGE_SIZE);
3179 free_page((unsigned long)inuse);
3182 set->name = kasprintf(GFP_KERNEL, name, min + n);
3186 list_for_each_entry(i, &ctx->table->sets, list) {
3187 if (!nft_is_active_next(ctx->net, i))
3189 if (!strcmp(set->name, i->name)) {
3197 static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3199 u64 ms = be64_to_cpu(nla_get_be64(nla));
3200 u64 max = (u64)(~((u64)0));
3202 max = div_u64(max, NSEC_PER_MSEC);
3206 ms *= NSEC_PER_MSEC;
3207 *result = nsecs_to_jiffies64(ms);
3211 static __be64 nf_jiffies64_to_msecs(u64 input)
3213 return cpu_to_be64(jiffies64_to_msecs(input));
3216 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3217 const struct nft_set *set, u16 event, u16 flags)
3219 struct nfgenmsg *nfmsg;
3220 struct nlmsghdr *nlh;
3221 struct nlattr *desc;
3222 u32 portid = ctx->portid;
3225 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3226 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3229 goto nla_put_failure;
3231 nfmsg = nlmsg_data(nlh);
3232 nfmsg->nfgen_family = ctx->family;
3233 nfmsg->version = NFNETLINK_V0;
3234 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3236 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3237 goto nla_put_failure;
3238 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3239 goto nla_put_failure;
3240 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3242 goto nla_put_failure;
3243 if (set->flags != 0)
3244 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3245 goto nla_put_failure;
3247 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3248 goto nla_put_failure;
3249 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3250 goto nla_put_failure;
3251 if (set->flags & NFT_SET_MAP) {
3252 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3253 goto nla_put_failure;
3254 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3255 goto nla_put_failure;
3257 if (set->flags & NFT_SET_OBJECT &&
3258 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3259 goto nla_put_failure;
3262 nla_put_be64(skb, NFTA_SET_TIMEOUT,
3263 nf_jiffies64_to_msecs(set->timeout),
3265 goto nla_put_failure;
3267 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3268 goto nla_put_failure;
3270 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3271 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3272 goto nla_put_failure;
3275 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3276 goto nla_put_failure;
3278 desc = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3280 goto nla_put_failure;
3282 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3283 goto nla_put_failure;
3284 nla_nest_end(skb, desc);
3286 nlmsg_end(skb, nlh);
3290 nlmsg_trim(skb, nlh);
3294 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3295 const struct nft_set *set, int event,
3298 struct sk_buff *skb;
3299 u32 portid = ctx->portid;
3303 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3306 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3310 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3316 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
3320 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3323 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3325 const struct nft_set *set;
3326 unsigned int idx, s_idx = cb->args[0];
3327 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3328 struct net *net = sock_net(skb->sk);
3329 struct nft_ctx *ctx = cb->data, ctx_set;
3335 cb->seq = net->nft.base_seq;
3337 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3338 if (ctx->family != NFPROTO_UNSPEC &&
3339 ctx->family != table->family)
3342 if (ctx->table && ctx->table != table)
3346 if (cur_table != table)
3352 list_for_each_entry_rcu(set, &table->sets, list) {
3355 if (!nft_is_active(net, set))
3359 ctx_set.table = table;
3360 ctx_set.family = table->family;
3362 if (nf_tables_fill_set(skb, &ctx_set, set,
3366 cb->args[2] = (unsigned long) table;
3369 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3382 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3384 struct nft_ctx *ctx_dump = NULL;
3386 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3387 if (ctx_dump == NULL)
3390 cb->data = ctx_dump;
3394 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3400 /* called with rcu_read_lock held */
3401 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3402 struct sk_buff *skb, const struct nlmsghdr *nlh,
3403 const struct nlattr * const nla[],
3404 struct netlink_ext_ack *extack)
3406 u8 genmask = nft_genmask_cur(net);
3407 const struct nft_set *set;
3409 struct sk_buff *skb2;
3410 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3413 /* Verify existence before starting dump */
3414 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3419 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3420 struct netlink_dump_control c = {
3421 .start = nf_tables_dump_sets_start,
3422 .dump = nf_tables_dump_sets,
3423 .done = nf_tables_dump_sets_done,
3425 .module = THIS_MODULE,
3428 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3431 /* Only accept unspec with dump */
3432 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3433 return -EAFNOSUPPORT;
3434 if (!nla[NFTA_SET_TABLE])
3437 set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3439 return PTR_ERR(set);
3441 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3445 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3449 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3456 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
3457 const struct nlattr *nla)
3459 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
3462 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
3463 nft_set_desc_policy, NULL);
3467 if (da[NFTA_SET_DESC_SIZE] != NULL)
3468 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
3473 static int nf_tables_newset(struct net *net, struct sock *nlsk,
3474 struct sk_buff *skb, const struct nlmsghdr *nlh,
3475 const struct nlattr * const nla[],
3476 struct netlink_ext_ack *extack)
3478 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3479 u8 genmask = nft_genmask_next(net);
3480 int family = nfmsg->nfgen_family;
3481 const struct nft_set_ops *ops;
3482 struct nft_table *table;
3483 struct nft_set *set;
3488 u32 ktype, dtype, flags, policy, gc_int, objtype;
3489 struct nft_set_desc desc;
3490 unsigned char *udata;
3494 if (nla[NFTA_SET_TABLE] == NULL ||
3495 nla[NFTA_SET_NAME] == NULL ||
3496 nla[NFTA_SET_KEY_LEN] == NULL ||
3497 nla[NFTA_SET_ID] == NULL)
3500 memset(&desc, 0, sizeof(desc));
3502 ktype = NFT_DATA_VALUE;
3503 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3504 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3505 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3509 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
3510 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
3514 if (nla[NFTA_SET_FLAGS] != NULL) {
3515 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3516 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
3517 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
3518 NFT_SET_MAP | NFT_SET_EVAL |
3521 /* Only one of these operations is supported */
3522 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3523 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
3528 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3529 if (!(flags & NFT_SET_MAP))
3532 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3533 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3534 dtype != NFT_DATA_VERDICT)
3537 if (dtype != NFT_DATA_VERDICT) {
3538 if (nla[NFTA_SET_DATA_LEN] == NULL)
3540 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
3541 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
3544 desc.dlen = sizeof(struct nft_verdict);
3545 } else if (flags & NFT_SET_MAP)
3548 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3549 if (!(flags & NFT_SET_OBJECT))
3552 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3553 if (objtype == NFT_OBJECT_UNSPEC ||
3554 objtype > NFT_OBJECT_MAX)
3556 } else if (flags & NFT_SET_OBJECT)
3559 objtype = NFT_OBJECT_UNSPEC;
3562 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3563 if (!(flags & NFT_SET_TIMEOUT))
3566 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
3571 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3572 if (!(flags & NFT_SET_TIMEOUT))
3574 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3577 policy = NFT_SET_POL_PERFORMANCE;
3578 if (nla[NFTA_SET_POLICY] != NULL)
3579 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3581 if (nla[NFTA_SET_DESC] != NULL) {
3582 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
3587 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
3588 if (IS_ERR(table)) {
3589 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3590 return PTR_ERR(table);
3593 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
3595 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
3597 if (PTR_ERR(set) != -ENOENT) {
3598 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3599 return PTR_ERR(set);
3602 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3603 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3606 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3612 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3615 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
3617 return PTR_ERR(ops);
3620 if (nla[NFTA_SET_USERDATA])
3621 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3624 if (ops->privsize != NULL)
3625 size = ops->privsize(nla, &desc);
3627 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3633 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3639 err = nf_tables_set_alloc_name(&ctx, set, name);
3646 udata = set->data + size;
3647 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3650 INIT_LIST_HEAD(&set->bindings);
3652 write_pnet(&set->net, net);
3655 set->klen = desc.klen;
3657 set->objtype = objtype;
3658 set->dlen = desc.dlen;
3660 set->size = desc.size;
3661 set->policy = policy;
3664 set->timeout = timeout;
3665 set->gc_int = gc_int;
3666 set->handle = nf_tables_alloc_handle(table);
3668 err = ops->init(set, &desc, nla);
3672 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3676 list_add_tail_rcu(&set->list, &table->sets);
3687 module_put(to_set_type(ops)->owner);
3691 static void nft_set_destroy(struct nft_set *set)
3693 if (WARN_ON(set->use > 0))
3696 set->ops->destroy(set);
3697 module_put(to_set_type(set->ops)->owner);
3702 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3703 struct sk_buff *skb, const struct nlmsghdr *nlh,
3704 const struct nlattr * const nla[],
3705 struct netlink_ext_ack *extack)
3707 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3708 u8 genmask = nft_genmask_next(net);
3709 const struct nlattr *attr;
3710 struct nft_set *set;
3714 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3715 return -EAFNOSUPPORT;
3716 if (nla[NFTA_SET_TABLE] == NULL)
3719 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3724 if (nla[NFTA_SET_HANDLE]) {
3725 attr = nla[NFTA_SET_HANDLE];
3726 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
3728 attr = nla[NFTA_SET_NAME];
3729 set = nft_set_lookup(ctx.table, attr, genmask);
3733 NL_SET_BAD_ATTR(extack, attr);
3734 return PTR_ERR(set);
3737 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
3738 NL_SET_BAD_ATTR(extack, attr);
3742 return nft_delset(&ctx, set);
3745 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3746 struct nft_set *set,
3747 const struct nft_set_iter *iter,
3748 struct nft_set_elem *elem)
3750 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3751 enum nft_registers dreg;
3753 dreg = nft_type_to_reg(set->dtype);
3754 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3755 set->dtype == NFT_DATA_VERDICT ?
3756 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3760 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3761 struct nft_set_binding *binding)
3763 struct nft_set_binding *i;
3764 struct nft_set_iter iter;
3766 if (set->use == UINT_MAX)
3769 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
3772 if (binding->flags & NFT_SET_MAP) {
3773 /* If the set is already bound to the same chain all
3774 * jumps are already validated for that chain.
3776 list_for_each_entry(i, &set->bindings, list) {
3777 if (i->flags & NFT_SET_MAP &&
3778 i->chain == binding->chain)
3782 iter.genmask = nft_genmask_next(ctx->net);
3786 iter.fn = nf_tables_bind_check_setelem;
3788 set->ops->walk(ctx, set, &iter);
3793 binding->chain = ctx->chain;
3794 list_add_tail_rcu(&binding->list, &set->bindings);
3795 nft_set_trans_bind(ctx, set);
3800 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3802 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3803 struct nft_set_binding *binding, bool event)
3805 list_del_rcu(&binding->list);
3807 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
3808 list_del_rcu(&set->list);
3810 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
3815 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
3816 struct nft_set_binding *binding,
3817 enum nft_trans_phase phase)
3820 case NFT_TRANS_PREPARE:
3823 case NFT_TRANS_ABORT:
3824 case NFT_TRANS_RELEASE:
3828 nf_tables_unbind_set(ctx, set, binding,
3829 phase == NFT_TRANS_COMMIT);
3832 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
3834 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
3836 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
3837 nft_set_destroy(set);
3839 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
3841 const struct nft_set_ext_type nft_set_ext_types[] = {
3842 [NFT_SET_EXT_KEY] = {
3843 .align = __alignof__(u32),
3845 [NFT_SET_EXT_DATA] = {
3846 .align = __alignof__(u32),
3848 [NFT_SET_EXT_EXPR] = {
3849 .align = __alignof__(struct nft_expr),
3851 [NFT_SET_EXT_OBJREF] = {
3852 .len = sizeof(struct nft_object *),
3853 .align = __alignof__(struct nft_object *),
3855 [NFT_SET_EXT_FLAGS] = {
3857 .align = __alignof__(u8),
3859 [NFT_SET_EXT_TIMEOUT] = {
3861 .align = __alignof__(u64),
3863 [NFT_SET_EXT_EXPIRATION] = {
3865 .align = __alignof__(u64),
3867 [NFT_SET_EXT_USERDATA] = {
3868 .len = sizeof(struct nft_userdata),
3869 .align = __alignof__(struct nft_userdata),
3872 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3878 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3879 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3880 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3881 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3882 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3883 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3884 .len = NFT_USERDATA_MAXLEN },
3885 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
3886 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING },
3889 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3890 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3891 .len = NFT_TABLE_MAXNAMELEN - 1 },
3892 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3893 .len = NFT_SET_MAXNAMELEN - 1 },
3894 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3895 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3898 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3899 const struct sk_buff *skb,
3900 const struct nlmsghdr *nlh,
3901 const struct nlattr * const nla[],
3902 struct netlink_ext_ack *extack,
3905 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3906 int family = nfmsg->nfgen_family;
3907 struct nft_table *table;
3909 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
3911 if (IS_ERR(table)) {
3912 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
3913 return PTR_ERR(table);
3916 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3920 static int nf_tables_fill_setelem(struct sk_buff *skb,
3921 const struct nft_set *set,
3922 const struct nft_set_elem *elem)
3924 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3925 unsigned char *b = skb_tail_pointer(skb);
3926 struct nlattr *nest;
3928 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3930 goto nla_put_failure;
3932 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3933 NFT_DATA_VALUE, set->klen) < 0)
3934 goto nla_put_failure;
3936 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3937 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3938 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3940 goto nla_put_failure;
3942 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3943 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3944 goto nla_put_failure;
3946 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3947 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3948 (*nft_set_ext_obj(ext))->key.name) < 0)
3949 goto nla_put_failure;
3951 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3952 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3953 htonl(*nft_set_ext_flags(ext))))
3954 goto nla_put_failure;
3956 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3957 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3958 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
3960 goto nla_put_failure;
3962 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3963 u64 expires, now = get_jiffies_64();
3965 expires = *nft_set_ext_expiration(ext);
3966 if (time_before64(now, expires))
3971 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3972 nf_jiffies64_to_msecs(expires),
3974 goto nla_put_failure;
3977 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3978 struct nft_userdata *udata;
3980 udata = nft_set_ext_userdata(ext);
3981 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3982 udata->len + 1, udata->data))
3983 goto nla_put_failure;
3986 nla_nest_end(skb, nest);
3994 struct nft_set_dump_args {
3995 const struct netlink_callback *cb;
3996 struct nft_set_iter iter;
3997 struct sk_buff *skb;
4000 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4001 struct nft_set *set,
4002 const struct nft_set_iter *iter,
4003 struct nft_set_elem *elem)
4005 struct nft_set_dump_args *args;
4007 args = container_of(iter, struct nft_set_dump_args, iter);
4008 return nf_tables_fill_setelem(args->skb, set, elem);
4011 struct nft_set_dump_ctx {
4012 const struct nft_set *set;
4016 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4018 struct nft_set_dump_ctx *dump_ctx = cb->data;
4019 struct net *net = sock_net(skb->sk);
4020 struct nft_table *table;
4021 struct nft_set *set;
4022 struct nft_set_dump_args args;
4023 bool set_found = false;
4024 struct nfgenmsg *nfmsg;
4025 struct nlmsghdr *nlh;
4026 struct nlattr *nest;
4031 list_for_each_entry_rcu(table, &net->nft.tables, list) {
4032 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4033 dump_ctx->ctx.family != table->family)
4036 if (table != dump_ctx->ctx.table)
4039 list_for_each_entry_rcu(set, &table->sets, list) {
4040 if (set == dump_ctx->set) {
4053 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4054 portid = NETLINK_CB(cb->skb).portid;
4055 seq = cb->nlh->nlmsg_seq;
4057 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4060 goto nla_put_failure;
4062 nfmsg = nlmsg_data(nlh);
4063 nfmsg->nfgen_family = table->family;
4064 nfmsg->version = NFNETLINK_V0;
4065 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4067 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4068 goto nla_put_failure;
4069 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4070 goto nla_put_failure;
4072 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4074 goto nla_put_failure;
4078 args.iter.genmask = nft_genmask_cur(net);
4079 args.iter.skip = cb->args[0];
4080 args.iter.count = 0;
4082 args.iter.fn = nf_tables_dump_setelem;
4083 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4086 nla_nest_end(skb, nest);
4087 nlmsg_end(skb, nlh);
4089 if (args.iter.err && args.iter.err != -EMSGSIZE)
4090 return args.iter.err;
4091 if (args.iter.count == cb->args[0])
4094 cb->args[0] = args.iter.count;
4102 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4104 struct nft_set_dump_ctx *dump_ctx = cb->data;
4106 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4108 return cb->data ? 0 : -ENOMEM;
4111 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4117 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4118 const struct nft_ctx *ctx, u32 seq,
4119 u32 portid, int event, u16 flags,
4120 const struct nft_set *set,
4121 const struct nft_set_elem *elem)
4123 struct nfgenmsg *nfmsg;
4124 struct nlmsghdr *nlh;
4125 struct nlattr *nest;
4128 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4129 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4132 goto nla_put_failure;
4134 nfmsg = nlmsg_data(nlh);
4135 nfmsg->nfgen_family = ctx->family;
4136 nfmsg->version = NFNETLINK_V0;
4137 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
4139 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4140 goto nla_put_failure;
4141 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4142 goto nla_put_failure;
4144 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4146 goto nla_put_failure;
4148 err = nf_tables_fill_setelem(skb, set, elem);
4150 goto nla_put_failure;
4152 nla_nest_end(skb, nest);
4154 nlmsg_end(skb, nlh);
4158 nlmsg_trim(skb, nlh);
4162 static int nft_setelem_parse_flags(const struct nft_set *set,
4163 const struct nlattr *attr, u32 *flags)
4168 *flags = ntohl(nla_get_be32(attr));
4169 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4171 if (!(set->flags & NFT_SET_INTERVAL) &&
4172 *flags & NFT_SET_ELEM_INTERVAL_END)
4178 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4179 const struct nlattr *attr)
4181 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4182 struct nft_data_desc desc;
4183 struct nft_set_elem elem;
4184 struct sk_buff *skb;
4189 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4190 nft_set_elem_policy, NULL);
4194 if (!nla[NFTA_SET_ELEM_KEY])
4197 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4201 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4202 nla[NFTA_SET_ELEM_KEY]);
4207 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4210 priv = set->ops->get(ctx->net, set, &elem, flags);
4212 return PTR_ERR(priv);
4217 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
4221 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4222 NFT_MSG_NEWSETELEM, 0, set, &elem);
4226 err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT);
4227 /* This avoids a loop in nfnetlink. */
4235 /* this avoids a loop in nfnetlink. */
4236 return err == -EAGAIN ? -ENOBUFS : err;
4239 /* called with rcu_read_lock held */
4240 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4241 struct sk_buff *skb, const struct nlmsghdr *nlh,
4242 const struct nlattr * const nla[],
4243 struct netlink_ext_ack *extack)
4245 u8 genmask = nft_genmask_cur(net);
4246 struct nft_set *set;
4247 struct nlattr *attr;
4251 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4256 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4258 return PTR_ERR(set);
4260 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4261 struct netlink_dump_control c = {
4262 .start = nf_tables_dump_set_start,
4263 .dump = nf_tables_dump_set,
4264 .done = nf_tables_dump_set_done,
4265 .module = THIS_MODULE,
4267 struct nft_set_dump_ctx dump_ctx = {
4273 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4276 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4279 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4280 err = nft_get_set_elem(&ctx, set, attr);
4288 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4289 const struct nft_set *set,
4290 const struct nft_set_elem *elem,
4291 int event, u16 flags)
4293 struct net *net = ctx->net;
4294 u32 portid = ctx->portid;
4295 struct sk_buff *skb;
4298 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4301 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4305 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
4312 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
4316 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4319 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
4321 struct nft_set *set)
4323 struct nft_trans *trans;
4325 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
4329 nft_trans_elem_set(trans) = set;
4333 void *nft_set_elem_init(const struct nft_set *set,
4334 const struct nft_set_ext_tmpl *tmpl,
4335 const u32 *key, const u32 *data,
4336 u64 timeout, gfp_t gfp)
4338 struct nft_set_ext *ext;
4341 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
4345 ext = nft_set_elem_ext(set, elem);
4346 nft_set_ext_init(ext, tmpl);
4348 memcpy(nft_set_ext_key(ext), key, set->klen);
4349 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4350 memcpy(nft_set_ext_data(ext), data, set->dlen);
4351 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
4352 *nft_set_ext_expiration(ext) =
4353 get_jiffies_64() + timeout;
4354 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
4355 *nft_set_ext_timeout(ext) = timeout;
4360 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
4363 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4364 struct nft_ctx ctx = {
4365 .net = read_pnet(&set->net),
4366 .family = set->table->family,
4369 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
4370 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4371 nft_data_release(nft_set_ext_data(ext), set->dtype);
4372 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) {
4373 struct nft_expr *expr = nft_set_ext_expr(ext);
4375 if (expr->ops->destroy_clone) {
4376 expr->ops->destroy_clone(&ctx, expr);
4377 module_put(expr->ops->type->owner);
4379 nf_tables_expr_destroy(&ctx, expr);
4382 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4383 (*nft_set_ext_obj(ext))->use--;
4386 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
4388 /* Only called from commit path, nft_set_elem_deactivate() already deals with
4389 * the refcounting from the preparation phase.
4391 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
4392 const struct nft_set *set, void *elem)
4394 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4396 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
4397 nf_tables_expr_destroy(ctx, nft_set_ext_expr(ext));
4401 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4402 const struct nlattr *attr, u32 nlmsg_flags)
4404 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4405 u8 genmask = nft_genmask_next(ctx->net);
4406 struct nft_data_desc d1, d2;
4407 struct nft_set_ext_tmpl tmpl;
4408 struct nft_set_ext *ext, *ext2;
4409 struct nft_set_elem elem;
4410 struct nft_set_binding *binding;
4411 struct nft_object *obj = NULL;
4412 struct nft_userdata *udata;
4413 struct nft_data data;
4414 enum nft_registers dreg;
4415 struct nft_trans *trans;
4421 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4422 nft_set_elem_policy, NULL);
4426 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4429 nft_set_ext_prepare(&tmpl);
4431 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4435 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4437 if (set->flags & NFT_SET_MAP) {
4438 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
4439 !(flags & NFT_SET_ELEM_INTERVAL_END))
4441 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
4442 flags & NFT_SET_ELEM_INTERVAL_END)
4445 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4450 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
4451 if (!(set->flags & NFT_SET_TIMEOUT))
4453 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
4457 } else if (set->flags & NFT_SET_TIMEOUT) {
4458 timeout = set->timeout;
4461 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
4462 nla[NFTA_SET_ELEM_KEY]);
4466 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
4469 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
4471 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
4472 if (timeout != set->timeout)
4473 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
4476 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
4477 if (!(set->flags & NFT_SET_OBJECT)) {
4481 obj = nft_obj_lookup(ctx->net, ctx->table,
4482 nla[NFTA_SET_ELEM_OBJREF],
4483 set->objtype, genmask);
4488 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
4491 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
4492 err = nft_data_init(ctx, &data, sizeof(data), &d2,
4493 nla[NFTA_SET_ELEM_DATA]);
4498 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
4501 dreg = nft_type_to_reg(set->dtype);
4502 list_for_each_entry(binding, &set->bindings, list) {
4503 struct nft_ctx bind_ctx = {
4505 .family = ctx->family,
4506 .table = ctx->table,
4507 .chain = (struct nft_chain *)binding->chain,
4510 if (!(binding->flags & NFT_SET_MAP))
4513 err = nft_validate_register_store(&bind_ctx, dreg,
4519 if (d2.type == NFT_DATA_VERDICT &&
4520 (data.verdict.code == NFT_GOTO ||
4521 data.verdict.code == NFT_JUMP))
4522 nft_validate_state_update(ctx->net,
4526 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
4529 /* The full maximum length of userdata can exceed the maximum
4530 * offset value (U8_MAX) for following extensions, therefor it
4531 * must be the last extension added.
4534 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
4535 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
4537 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
4542 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
4543 timeout, GFP_KERNEL);
4544 if (elem.priv == NULL)
4547 ext = nft_set_elem_ext(set, elem.priv);
4549 *nft_set_ext_flags(ext) = flags;
4551 udata = nft_set_ext_userdata(ext);
4552 udata->len = ulen - 1;
4553 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
4556 *nft_set_ext_obj(ext) = obj;
4560 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
4564 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
4565 err = set->ops->insert(ctx->net, set, &elem, &ext2);
4567 if (err == -EEXIST) {
4568 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
4569 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
4570 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
4571 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
4575 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4576 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
4577 memcmp(nft_set_ext_data(ext),
4578 nft_set_ext_data(ext2), set->dlen) != 0) ||
4579 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4580 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
4581 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
4583 else if (!(nlmsg_flags & NLM_F_EXCL))
4590 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
4595 nft_trans_elem(trans) = elem;
4596 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4600 set->ops->remove(ctx->net, set, &elem);
4608 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4609 nft_data_release(&data, d2.type);
4611 nft_data_release(&elem.key.val, d1.type);
4616 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
4617 struct sk_buff *skb, const struct nlmsghdr *nlh,
4618 const struct nlattr * const nla[],
4619 struct netlink_ext_ack *extack)
4621 u8 genmask = nft_genmask_next(net);
4622 const struct nlattr *attr;
4623 struct nft_set *set;
4627 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
4630 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4635 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4636 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
4638 return PTR_ERR(set);
4640 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4643 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4644 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
4649 if (net->nft.validate_state == NFT_VALIDATE_DO)
4650 return nft_table_validate(net, ctx.table);
4656 * nft_data_hold - hold a nft_data item
4658 * @data: struct nft_data to release
4659 * @type: type of data
4661 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4662 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
4663 * NFT_GOTO verdicts. This function must be called on active data objects
4664 * from the second phase of the commit protocol.
4666 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
4668 if (type == NFT_DATA_VERDICT) {
4669 switch (data->verdict.code) {
4672 data->verdict.chain->use++;
4678 static void nft_set_elem_activate(const struct net *net,
4679 const struct nft_set *set,
4680 struct nft_set_elem *elem)
4682 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4684 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4685 nft_data_hold(nft_set_ext_data(ext), set->dtype);
4686 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4687 (*nft_set_ext_obj(ext))->use++;
4690 static void nft_set_elem_deactivate(const struct net *net,
4691 const struct nft_set *set,
4692 struct nft_set_elem *elem)
4694 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4696 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4697 nft_data_release(nft_set_ext_data(ext), set->dtype);
4698 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4699 (*nft_set_ext_obj(ext))->use--;
4702 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
4703 const struct nlattr *attr)
4705 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4706 struct nft_set_ext_tmpl tmpl;
4707 struct nft_data_desc desc;
4708 struct nft_set_elem elem;
4709 struct nft_set_ext *ext;
4710 struct nft_trans *trans;
4715 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4716 nft_set_elem_policy, NULL);
4721 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4724 nft_set_ext_prepare(&tmpl);
4726 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4730 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4732 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4733 nla[NFTA_SET_ELEM_KEY]);
4738 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4741 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
4744 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
4746 if (elem.priv == NULL)
4749 ext = nft_set_elem_ext(set, elem.priv);
4751 *nft_set_ext_flags(ext) = flags;
4753 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
4754 if (trans == NULL) {
4759 priv = set->ops->deactivate(ctx->net, set, &elem);
4767 nft_set_elem_deactivate(ctx->net, set, &elem);
4769 nft_trans_elem(trans) = elem;
4770 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4778 nft_data_release(&elem.key.val, desc.type);
4783 static int nft_flush_set(const struct nft_ctx *ctx,
4784 struct nft_set *set,
4785 const struct nft_set_iter *iter,
4786 struct nft_set_elem *elem)
4788 struct nft_trans *trans;
4791 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
4792 sizeof(struct nft_trans_elem), GFP_ATOMIC);
4796 if (!set->ops->flush(ctx->net, set, elem->priv)) {
4802 nft_set_elem_deactivate(ctx->net, set, elem);
4803 nft_trans_elem_set(trans) = set;
4804 nft_trans_elem(trans) = *elem;
4805 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4813 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
4814 struct sk_buff *skb, const struct nlmsghdr *nlh,
4815 const struct nlattr * const nla[],
4816 struct netlink_ext_ack *extack)
4818 u8 genmask = nft_genmask_next(net);
4819 const struct nlattr *attr;
4820 struct nft_set *set;
4824 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4829 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4831 return PTR_ERR(set);
4832 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4835 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
4836 struct nft_set_iter iter = {
4838 .fn = nft_flush_set,
4840 set->ops->walk(&ctx, set, &iter);
4845 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4846 err = nft_del_setelem(&ctx, set, attr);
4855 void nft_set_gc_batch_release(struct rcu_head *rcu)
4857 struct nft_set_gc_batch *gcb;
4860 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4861 for (i = 0; i < gcb->head.cnt; i++)
4862 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
4865 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4867 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4870 struct nft_set_gc_batch *gcb;
4872 gcb = kzalloc(sizeof(*gcb), gfp);
4875 gcb->head.set = set;
4878 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4885 * nft_register_obj- register nf_tables stateful object type
4888 * Registers the object type for use with nf_tables. Returns zero on
4889 * success or a negative errno code otherwise.
4891 int nft_register_obj(struct nft_object_type *obj_type)
4893 if (obj_type->type == NFT_OBJECT_UNSPEC)
4896 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4897 list_add_rcu(&obj_type->list, &nf_tables_objects);
4898 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4901 EXPORT_SYMBOL_GPL(nft_register_obj);
4904 * nft_unregister_obj - unregister nf_tables object type
4907 * Unregisters the object type for use with nf_tables.
4909 void nft_unregister_obj(struct nft_object_type *obj_type)
4911 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4912 list_del_rcu(&obj_type->list);
4913 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4915 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4917 struct nft_object *nft_obj_lookup(const struct net *net,
4918 const struct nft_table *table,
4919 const struct nlattr *nla, u32 objtype,
4922 struct nft_object_hash_key k = { .table = table };
4923 char search[NFT_OBJ_MAXNAMELEN];
4924 struct rhlist_head *tmp, *list;
4925 struct nft_object *obj;
4927 nla_strlcpy(search, nla, sizeof(search));
4930 WARN_ON_ONCE(!rcu_read_lock_held() &&
4931 !lockdep_commit_lock_is_held(net));
4934 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
4938 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
4939 if (objtype == obj->ops->type->type &&
4940 nft_active_genmask(obj, genmask)) {
4947 return ERR_PTR(-ENOENT);
4949 EXPORT_SYMBOL_GPL(nft_obj_lookup);
4951 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
4952 const struct nlattr *nla,
4953 u32 objtype, u8 genmask)
4955 struct nft_object *obj;
4957 list_for_each_entry(obj, &table->objects, list) {
4958 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
4959 objtype == obj->ops->type->type &&
4960 nft_active_genmask(obj, genmask))
4963 return ERR_PTR(-ENOENT);
4966 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4967 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4968 .len = NFT_TABLE_MAXNAMELEN - 1 },
4969 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4970 .len = NFT_OBJ_MAXNAMELEN - 1 },
4971 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4972 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4973 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
4976 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4977 const struct nft_object_type *type,
4978 const struct nlattr *attr)
4981 const struct nft_object_ops *ops;
4982 struct nft_object *obj;
4985 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
4990 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
4991 type->policy, NULL);
4995 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4998 if (type->select_ops) {
4999 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
5009 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
5013 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
5026 return ERR_PTR(err);
5029 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
5030 struct nft_object *obj, bool reset)
5032 struct nlattr *nest;
5034 nest = nla_nest_start_noflag(skb, attr);
5036 goto nla_put_failure;
5037 if (obj->ops->dump(skb, obj, reset) < 0)
5038 goto nla_put_failure;
5039 nla_nest_end(skb, nest);
5046 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
5048 const struct nft_object_type *type;
5050 list_for_each_entry(type, &nf_tables_objects, list) {
5051 if (objtype == type->type)
5057 static const struct nft_object_type *
5058 nft_obj_type_get(struct net *net, u32 objtype)
5060 const struct nft_object_type *type;
5062 type = __nft_obj_type_get(objtype);
5063 if (type != NULL && try_module_get(type->owner))
5066 lockdep_nfnl_nft_mutex_not_held();
5067 #ifdef CONFIG_MODULES
5069 nft_request_module(net, "nft-obj-%u", objtype);
5070 if (__nft_obj_type_get(objtype))
5071 return ERR_PTR(-EAGAIN);
5074 return ERR_PTR(-ENOENT);
5077 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
5078 struct sk_buff *skb, const struct nlmsghdr *nlh,
5079 const struct nlattr * const nla[],
5080 struct netlink_ext_ack *extack)
5082 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5083 const struct nft_object_type *type;
5084 u8 genmask = nft_genmask_next(net);
5085 int family = nfmsg->nfgen_family;
5086 struct nft_table *table;
5087 struct nft_object *obj;
5092 if (!nla[NFTA_OBJ_TYPE] ||
5093 !nla[NFTA_OBJ_NAME] ||
5094 !nla[NFTA_OBJ_DATA])
5097 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5098 if (IS_ERR(table)) {
5099 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5100 return PTR_ERR(table);
5103 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5104 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
5107 if (err != -ENOENT) {
5108 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5112 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5113 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5119 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5121 type = nft_obj_type_get(net, objtype);
5123 return PTR_ERR(type);
5125 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
5130 obj->key.table = table;
5131 obj->handle = nf_tables_alloc_handle(table);
5133 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
5134 if (!obj->key.name) {
5139 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
5143 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
5144 nft_objname_ht_params);
5148 list_add_tail_rcu(&obj->list, &table->objects);
5152 /* queued in transaction log */
5153 INIT_LIST_HEAD(&obj->list);
5156 kfree(obj->key.name);
5158 if (obj->ops->destroy)
5159 obj->ops->destroy(&ctx, obj);
5162 module_put(type->owner);
5166 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
5167 u32 portid, u32 seq, int event, u32 flags,
5168 int family, const struct nft_table *table,
5169 struct nft_object *obj, bool reset)
5171 struct nfgenmsg *nfmsg;
5172 struct nlmsghdr *nlh;
5174 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5175 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5177 goto nla_put_failure;
5179 nfmsg = nlmsg_data(nlh);
5180 nfmsg->nfgen_family = family;
5181 nfmsg->version = NFNETLINK_V0;
5182 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5184 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
5185 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
5186 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
5187 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
5188 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
5189 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
5191 goto nla_put_failure;
5193 nlmsg_end(skb, nlh);
5197 nlmsg_trim(skb, nlh);
5201 struct nft_obj_filter {
5206 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
5208 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5209 const struct nft_table *table;
5210 unsigned int idx = 0, s_idx = cb->args[0];
5211 struct nft_obj_filter *filter = cb->data;
5212 struct net *net = sock_net(skb->sk);
5213 int family = nfmsg->nfgen_family;
5214 struct nft_object *obj;
5217 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5221 cb->seq = net->nft.base_seq;
5223 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5224 if (family != NFPROTO_UNSPEC && family != table->family)
5227 list_for_each_entry_rcu(obj, &table->objects, list) {
5228 if (!nft_is_active(net, obj))
5233 memset(&cb->args[1], 0,
5234 sizeof(cb->args) - sizeof(cb->args[0]));
5235 if (filter && filter->table &&
5236 strcmp(filter->table, table->name))
5239 filter->type != NFT_OBJECT_UNSPEC &&
5240 obj->ops->type->type != filter->type)
5243 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
5246 NLM_F_MULTI | NLM_F_APPEND,
5247 table->family, table,
5251 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5263 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
5265 const struct nlattr * const *nla = cb->data;
5266 struct nft_obj_filter *filter = NULL;
5268 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
5269 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5273 if (nla[NFTA_OBJ_TABLE]) {
5274 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
5275 if (!filter->table) {
5281 if (nla[NFTA_OBJ_TYPE])
5282 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5289 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
5291 struct nft_obj_filter *filter = cb->data;
5294 kfree(filter->table);
5301 /* called with rcu_read_lock held */
5302 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
5303 struct sk_buff *skb, const struct nlmsghdr *nlh,
5304 const struct nlattr * const nla[],
5305 struct netlink_ext_ack *extack)
5307 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5308 u8 genmask = nft_genmask_cur(net);
5309 int family = nfmsg->nfgen_family;
5310 const struct nft_table *table;
5311 struct nft_object *obj;
5312 struct sk_buff *skb2;
5317 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5318 struct netlink_dump_control c = {
5319 .start = nf_tables_dump_obj_start,
5320 .dump = nf_tables_dump_obj,
5321 .done = nf_tables_dump_obj_done,
5322 .module = THIS_MODULE,
5323 .data = (void *)nla,
5326 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5329 if (!nla[NFTA_OBJ_NAME] ||
5330 !nla[NFTA_OBJ_TYPE])
5333 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5334 if (IS_ERR(table)) {
5335 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5336 return PTR_ERR(table);
5339 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5340 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
5342 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5343 return PTR_ERR(obj);
5346 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5350 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5353 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
5354 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
5355 family, table, obj, reset);
5359 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5365 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
5367 if (obj->ops->destroy)
5368 obj->ops->destroy(ctx, obj);
5370 module_put(obj->ops->type->owner);
5371 kfree(obj->key.name);
5375 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
5376 struct sk_buff *skb, const struct nlmsghdr *nlh,
5377 const struct nlattr * const nla[],
5378 struct netlink_ext_ack *extack)
5380 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5381 u8 genmask = nft_genmask_next(net);
5382 int family = nfmsg->nfgen_family;
5383 const struct nlattr *attr;
5384 struct nft_table *table;
5385 struct nft_object *obj;
5389 if (!nla[NFTA_OBJ_TYPE] ||
5390 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
5393 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5394 if (IS_ERR(table)) {
5395 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5396 return PTR_ERR(table);
5399 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5400 if (nla[NFTA_OBJ_HANDLE]) {
5401 attr = nla[NFTA_OBJ_HANDLE];
5402 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
5404 attr = nla[NFTA_OBJ_NAME];
5405 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
5409 NL_SET_BAD_ATTR(extack, attr);
5410 return PTR_ERR(obj);
5413 NL_SET_BAD_ATTR(extack, attr);
5417 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5419 return nft_delobj(&ctx, obj);
5422 void nft_obj_notify(struct net *net, const struct nft_table *table,
5423 struct nft_object *obj, u32 portid, u32 seq, int event,
5424 int family, int report, gfp_t gfp)
5426 struct sk_buff *skb;
5430 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5433 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
5437 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
5444 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
5447 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5449 EXPORT_SYMBOL_GPL(nft_obj_notify);
5451 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
5452 struct nft_object *obj, int event)
5454 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
5455 ctx->family, ctx->report, GFP_KERNEL);
5461 void nft_register_flowtable_type(struct nf_flowtable_type *type)
5463 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5464 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
5465 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5467 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
5469 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
5471 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5472 list_del_rcu(&type->list);
5473 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5475 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
5477 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
5478 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
5479 .len = NFT_NAME_MAXLEN - 1 },
5480 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
5481 .len = NFT_NAME_MAXLEN - 1 },
5482 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
5483 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
5486 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
5487 const struct nlattr *nla, u8 genmask)
5489 struct nft_flowtable *flowtable;
5491 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5492 if (!nla_strcmp(nla, flowtable->name) &&
5493 nft_active_genmask(flowtable, genmask))
5496 return ERR_PTR(-ENOENT);
5498 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
5500 static struct nft_flowtable *
5501 nft_flowtable_lookup_byhandle(const struct nft_table *table,
5502 const struct nlattr *nla, u8 genmask)
5504 struct nft_flowtable *flowtable;
5506 list_for_each_entry(flowtable, &table->flowtables, list) {
5507 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
5508 nft_active_genmask(flowtable, genmask))
5511 return ERR_PTR(-ENOENT);
5514 static int nf_tables_parse_devices(const struct nft_ctx *ctx,
5515 const struct nlattr *attr,
5516 struct net_device *dev_array[], int *len)
5518 const struct nlattr *tmp;
5519 struct net_device *dev;
5520 char ifname[IFNAMSIZ];
5521 int rem, n = 0, err;
5523 nla_for_each_nested(tmp, attr, rem) {
5524 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
5529 nla_strlcpy(ifname, tmp, IFNAMSIZ);
5530 dev = __dev_get_by_name(ctx->net, ifname);
5536 dev_array[n++] = dev;
5537 if (n == NFT_FLOWTABLE_DEVICE_MAX) {
5551 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
5552 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
5553 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
5554 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
5557 static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx,
5558 const struct nlattr *attr,
5559 struct nft_flowtable *flowtable)
5561 struct net_device *dev_array[NFT_FLOWTABLE_DEVICE_MAX];
5562 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
5563 struct nf_hook_ops *ops;
5564 int hooknum, priority;
5567 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
5568 nft_flowtable_hook_policy, NULL);
5572 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
5573 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] ||
5574 !tb[NFTA_FLOWTABLE_HOOK_DEVS])
5577 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
5578 if (hooknum != NF_NETDEV_INGRESS)
5581 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
5583 err = nf_tables_parse_devices(ctx, tb[NFTA_FLOWTABLE_HOOK_DEVS],
5588 ops = kcalloc(n, sizeof(struct nf_hook_ops), GFP_KERNEL);
5592 flowtable->hooknum = hooknum;
5593 flowtable->priority = priority;
5594 flowtable->ops = ops;
5595 flowtable->ops_len = n;
5597 for (i = 0; i < n; i++) {
5598 flowtable->ops[i].pf = NFPROTO_NETDEV;
5599 flowtable->ops[i].hooknum = hooknum;
5600 flowtable->ops[i].priority = priority;
5601 flowtable->ops[i].priv = &flowtable->data;
5602 flowtable->ops[i].hook = flowtable->data.type->hook;
5603 flowtable->ops[i].dev = dev_array[i];
5609 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
5611 const struct nf_flowtable_type *type;
5613 list_for_each_entry(type, &nf_tables_flowtables, list) {
5614 if (family == type->family)
5620 static const struct nf_flowtable_type *
5621 nft_flowtable_type_get(struct net *net, u8 family)
5623 const struct nf_flowtable_type *type;
5625 type = __nft_flowtable_type_get(family);
5626 if (type != NULL && try_module_get(type->owner))
5629 lockdep_nfnl_nft_mutex_not_held();
5630 #ifdef CONFIG_MODULES
5632 nft_request_module(net, "nf-flowtable-%u", family);
5633 if (__nft_flowtable_type_get(family))
5634 return ERR_PTR(-EAGAIN);
5637 return ERR_PTR(-ENOENT);
5640 static void nft_unregister_flowtable_net_hooks(struct net *net,
5641 struct nft_flowtable *flowtable)
5645 for (i = 0; i < flowtable->ops_len; i++) {
5646 if (!flowtable->ops[i].dev)
5649 nf_unregister_net_hook(net, &flowtable->ops[i]);
5653 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
5654 struct sk_buff *skb,
5655 const struct nlmsghdr *nlh,
5656 const struct nlattr * const nla[],
5657 struct netlink_ext_ack *extack)
5659 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5660 const struct nf_flowtable_type *type;
5661 struct nft_flowtable *flowtable, *ft;
5662 u8 genmask = nft_genmask_next(net);
5663 int family = nfmsg->nfgen_family;
5664 struct nft_table *table;
5668 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5669 !nla[NFTA_FLOWTABLE_NAME] ||
5670 !nla[NFTA_FLOWTABLE_HOOK])
5673 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5675 if (IS_ERR(table)) {
5676 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5677 return PTR_ERR(table);
5680 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5682 if (IS_ERR(flowtable)) {
5683 err = PTR_ERR(flowtable);
5684 if (err != -ENOENT) {
5685 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5689 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5690 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5697 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5699 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
5703 flowtable->table = table;
5704 flowtable->handle = nf_tables_alloc_handle(table);
5706 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
5707 if (!flowtable->name) {
5712 type = nft_flowtable_type_get(net, family);
5714 err = PTR_ERR(type);
5718 flowtable->data.type = type;
5719 err = type->init(&flowtable->data);
5723 err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
5728 for (i = 0; i < flowtable->ops_len; i++) {
5729 if (!flowtable->ops[i].dev)
5732 list_for_each_entry(ft, &table->flowtables, list) {
5733 for (k = 0; k < ft->ops_len; k++) {
5734 if (!ft->ops[k].dev)
5737 if (flowtable->ops[i].dev == ft->ops[k].dev &&
5738 flowtable->ops[i].pf == ft->ops[k].pf) {
5745 err = nf_register_net_hook(net, &flowtable->ops[i]);
5750 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
5754 list_add_tail_rcu(&flowtable->list, &table->flowtables);
5759 i = flowtable->ops_len;
5761 for (k = i - 1; k >= 0; k--)
5762 nf_unregister_net_hook(net, &flowtable->ops[k]);
5764 kfree(flowtable->ops);
5766 flowtable->data.type->free(&flowtable->data);
5768 module_put(type->owner);
5770 kfree(flowtable->name);
5776 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
5777 struct sk_buff *skb,
5778 const struct nlmsghdr *nlh,
5779 const struct nlattr * const nla[],
5780 struct netlink_ext_ack *extack)
5782 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5783 u8 genmask = nft_genmask_next(net);
5784 int family = nfmsg->nfgen_family;
5785 struct nft_flowtable *flowtable;
5786 const struct nlattr *attr;
5787 struct nft_table *table;
5790 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5791 (!nla[NFTA_FLOWTABLE_NAME] &&
5792 !nla[NFTA_FLOWTABLE_HANDLE]))
5795 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5797 if (IS_ERR(table)) {
5798 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5799 return PTR_ERR(table);
5802 if (nla[NFTA_FLOWTABLE_HANDLE]) {
5803 attr = nla[NFTA_FLOWTABLE_HANDLE];
5804 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
5806 attr = nla[NFTA_FLOWTABLE_NAME];
5807 flowtable = nft_flowtable_lookup(table, attr, genmask);
5810 if (IS_ERR(flowtable)) {
5811 NL_SET_BAD_ATTR(extack, attr);
5812 return PTR_ERR(flowtable);
5814 if (flowtable->use > 0) {
5815 NL_SET_BAD_ATTR(extack, attr);
5819 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5821 return nft_delflowtable(&ctx, flowtable);
5824 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
5825 u32 portid, u32 seq, int event,
5826 u32 flags, int family,
5827 struct nft_flowtable *flowtable)
5829 struct nlattr *nest, *nest_devs;
5830 struct nfgenmsg *nfmsg;
5831 struct nlmsghdr *nlh;
5834 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5835 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5837 goto nla_put_failure;
5839 nfmsg = nlmsg_data(nlh);
5840 nfmsg->nfgen_family = family;
5841 nfmsg->version = NFNETLINK_V0;
5842 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5844 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
5845 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
5846 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
5847 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
5848 NFTA_FLOWTABLE_PAD))
5849 goto nla_put_failure;
5851 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
5853 goto nla_put_failure;
5854 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
5855 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->priority)))
5856 goto nla_put_failure;
5858 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
5860 goto nla_put_failure;
5862 for (i = 0; i < flowtable->ops_len; i++) {
5863 const struct net_device *dev = READ_ONCE(flowtable->ops[i].dev);
5866 nla_put_string(skb, NFTA_DEVICE_NAME, dev->name))
5867 goto nla_put_failure;
5869 nla_nest_end(skb, nest_devs);
5870 nla_nest_end(skb, nest);
5872 nlmsg_end(skb, nlh);
5876 nlmsg_trim(skb, nlh);
5880 struct nft_flowtable_filter {
5884 static int nf_tables_dump_flowtable(struct sk_buff *skb,
5885 struct netlink_callback *cb)
5887 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5888 struct nft_flowtable_filter *filter = cb->data;
5889 unsigned int idx = 0, s_idx = cb->args[0];
5890 struct net *net = sock_net(skb->sk);
5891 int family = nfmsg->nfgen_family;
5892 struct nft_flowtable *flowtable;
5893 const struct nft_table *table;
5896 cb->seq = net->nft.base_seq;
5898 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5899 if (family != NFPROTO_UNSPEC && family != table->family)
5902 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5903 if (!nft_is_active(net, flowtable))
5908 memset(&cb->args[1], 0,
5909 sizeof(cb->args) - sizeof(cb->args[0]));
5910 if (filter && filter->table &&
5911 strcmp(filter->table, table->name))
5914 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
5916 NFT_MSG_NEWFLOWTABLE,
5917 NLM_F_MULTI | NLM_F_APPEND,
5918 table->family, flowtable) < 0)
5921 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5933 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
5935 const struct nlattr * const *nla = cb->data;
5936 struct nft_flowtable_filter *filter = NULL;
5938 if (nla[NFTA_FLOWTABLE_TABLE]) {
5939 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5943 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
5945 if (!filter->table) {
5955 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
5957 struct nft_flowtable_filter *filter = cb->data;
5962 kfree(filter->table);
5968 /* called with rcu_read_lock held */
5969 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
5970 struct sk_buff *skb,
5971 const struct nlmsghdr *nlh,
5972 const struct nlattr * const nla[],
5973 struct netlink_ext_ack *extack)
5975 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5976 u8 genmask = nft_genmask_cur(net);
5977 int family = nfmsg->nfgen_family;
5978 struct nft_flowtable *flowtable;
5979 const struct nft_table *table;
5980 struct sk_buff *skb2;
5983 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5984 struct netlink_dump_control c = {
5985 .start = nf_tables_dump_flowtable_start,
5986 .dump = nf_tables_dump_flowtable,
5987 .done = nf_tables_dump_flowtable_done,
5988 .module = THIS_MODULE,
5989 .data = (void *)nla,
5992 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5995 if (!nla[NFTA_FLOWTABLE_NAME])
5998 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6001 return PTR_ERR(table);
6003 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6005 if (IS_ERR(flowtable))
6006 return PTR_ERR(flowtable);
6008 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6012 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
6014 NFT_MSG_NEWFLOWTABLE, 0, family,
6019 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
6025 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
6026 struct nft_flowtable *flowtable,
6029 struct sk_buff *skb;
6033 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
6036 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6040 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
6042 ctx->family, flowtable);
6048 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
6049 ctx->report, GFP_KERNEL);
6052 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
6055 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
6057 kfree(flowtable->ops);
6058 kfree(flowtable->name);
6059 flowtable->data.type->free(&flowtable->data);
6060 module_put(flowtable->data.type->owner);
6064 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
6065 u32 portid, u32 seq)
6067 struct nlmsghdr *nlh;
6068 struct nfgenmsg *nfmsg;
6069 char buf[TASK_COMM_LEN];
6070 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
6072 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
6074 goto nla_put_failure;
6076 nfmsg = nlmsg_data(nlh);
6077 nfmsg->nfgen_family = AF_UNSPEC;
6078 nfmsg->version = NFNETLINK_V0;
6079 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
6081 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
6082 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
6083 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
6084 goto nla_put_failure;
6086 nlmsg_end(skb, nlh);
6090 nlmsg_trim(skb, nlh);
6094 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
6095 struct nft_flowtable *flowtable)
6099 for (i = 0; i < flowtable->ops_len; i++) {
6100 if (flowtable->ops[i].dev != dev)
6103 nf_unregister_net_hook(dev_net(dev), &flowtable->ops[i]);
6104 flowtable->ops[i].dev = NULL;
6109 static int nf_tables_flowtable_event(struct notifier_block *this,
6110 unsigned long event, void *ptr)
6112 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
6113 struct nft_flowtable *flowtable;
6114 struct nft_table *table;
6117 if (event != NETDEV_UNREGISTER)
6121 mutex_lock(&net->nft.commit_mutex);
6122 list_for_each_entry(table, &net->nft.tables, list) {
6123 list_for_each_entry(flowtable, &table->flowtables, list) {
6124 nft_flowtable_event(event, dev, flowtable);
6127 mutex_unlock(&net->nft.commit_mutex);
6132 static struct notifier_block nf_tables_flowtable_notifier = {
6133 .notifier_call = nf_tables_flowtable_event,
6136 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
6139 struct nlmsghdr *nlh = nlmsg_hdr(skb);
6140 struct sk_buff *skb2;
6143 if (nlmsg_report(nlh) &&
6144 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6147 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6151 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6158 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6159 nlmsg_report(nlh), GFP_KERNEL);
6162 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6166 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
6167 struct sk_buff *skb, const struct nlmsghdr *nlh,
6168 const struct nlattr * const nla[],
6169 struct netlink_ext_ack *extack)
6171 struct sk_buff *skb2;
6174 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6178 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6183 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
6189 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
6190 [NFT_MSG_NEWTABLE] = {
6191 .call_batch = nf_tables_newtable,
6192 .attr_count = NFTA_TABLE_MAX,
6193 .policy = nft_table_policy,
6195 [NFT_MSG_GETTABLE] = {
6196 .call_rcu = nf_tables_gettable,
6197 .attr_count = NFTA_TABLE_MAX,
6198 .policy = nft_table_policy,
6200 [NFT_MSG_DELTABLE] = {
6201 .call_batch = nf_tables_deltable,
6202 .attr_count = NFTA_TABLE_MAX,
6203 .policy = nft_table_policy,
6205 [NFT_MSG_NEWCHAIN] = {
6206 .call_batch = nf_tables_newchain,
6207 .attr_count = NFTA_CHAIN_MAX,
6208 .policy = nft_chain_policy,
6210 [NFT_MSG_GETCHAIN] = {
6211 .call_rcu = nf_tables_getchain,
6212 .attr_count = NFTA_CHAIN_MAX,
6213 .policy = nft_chain_policy,
6215 [NFT_MSG_DELCHAIN] = {
6216 .call_batch = nf_tables_delchain,
6217 .attr_count = NFTA_CHAIN_MAX,
6218 .policy = nft_chain_policy,
6220 [NFT_MSG_NEWRULE] = {
6221 .call_batch = nf_tables_newrule,
6222 .attr_count = NFTA_RULE_MAX,
6223 .policy = nft_rule_policy,
6225 [NFT_MSG_GETRULE] = {
6226 .call_rcu = nf_tables_getrule,
6227 .attr_count = NFTA_RULE_MAX,
6228 .policy = nft_rule_policy,
6230 [NFT_MSG_DELRULE] = {
6231 .call_batch = nf_tables_delrule,
6232 .attr_count = NFTA_RULE_MAX,
6233 .policy = nft_rule_policy,
6235 [NFT_MSG_NEWSET] = {
6236 .call_batch = nf_tables_newset,
6237 .attr_count = NFTA_SET_MAX,
6238 .policy = nft_set_policy,
6240 [NFT_MSG_GETSET] = {
6241 .call_rcu = nf_tables_getset,
6242 .attr_count = NFTA_SET_MAX,
6243 .policy = nft_set_policy,
6245 [NFT_MSG_DELSET] = {
6246 .call_batch = nf_tables_delset,
6247 .attr_count = NFTA_SET_MAX,
6248 .policy = nft_set_policy,
6250 [NFT_MSG_NEWSETELEM] = {
6251 .call_batch = nf_tables_newsetelem,
6252 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6253 .policy = nft_set_elem_list_policy,
6255 [NFT_MSG_GETSETELEM] = {
6256 .call_rcu = nf_tables_getsetelem,
6257 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6258 .policy = nft_set_elem_list_policy,
6260 [NFT_MSG_DELSETELEM] = {
6261 .call_batch = nf_tables_delsetelem,
6262 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6263 .policy = nft_set_elem_list_policy,
6265 [NFT_MSG_GETGEN] = {
6266 .call_rcu = nf_tables_getgen,
6268 [NFT_MSG_NEWOBJ] = {
6269 .call_batch = nf_tables_newobj,
6270 .attr_count = NFTA_OBJ_MAX,
6271 .policy = nft_obj_policy,
6273 [NFT_MSG_GETOBJ] = {
6274 .call_rcu = nf_tables_getobj,
6275 .attr_count = NFTA_OBJ_MAX,
6276 .policy = nft_obj_policy,
6278 [NFT_MSG_DELOBJ] = {
6279 .call_batch = nf_tables_delobj,
6280 .attr_count = NFTA_OBJ_MAX,
6281 .policy = nft_obj_policy,
6283 [NFT_MSG_GETOBJ_RESET] = {
6284 .call_rcu = nf_tables_getobj,
6285 .attr_count = NFTA_OBJ_MAX,
6286 .policy = nft_obj_policy,
6288 [NFT_MSG_NEWFLOWTABLE] = {
6289 .call_batch = nf_tables_newflowtable,
6290 .attr_count = NFTA_FLOWTABLE_MAX,
6291 .policy = nft_flowtable_policy,
6293 [NFT_MSG_GETFLOWTABLE] = {
6294 .call_rcu = nf_tables_getflowtable,
6295 .attr_count = NFTA_FLOWTABLE_MAX,
6296 .policy = nft_flowtable_policy,
6298 [NFT_MSG_DELFLOWTABLE] = {
6299 .call_batch = nf_tables_delflowtable,
6300 .attr_count = NFTA_FLOWTABLE_MAX,
6301 .policy = nft_flowtable_policy,
6305 static int nf_tables_validate(struct net *net)
6307 struct nft_table *table;
6309 switch (net->nft.validate_state) {
6310 case NFT_VALIDATE_SKIP:
6312 case NFT_VALIDATE_NEED:
6313 nft_validate_state_update(net, NFT_VALIDATE_DO);
6315 case NFT_VALIDATE_DO:
6316 list_for_each_entry(table, &net->nft.tables, list) {
6317 if (nft_table_validate(net, table) < 0)
6326 /* a drop policy has to be deferred until all rules have been activated,
6327 * otherwise a large ruleset that contains a drop-policy base chain will
6328 * cause all packets to get dropped until the full transaction has been
6331 * We defer the drop policy until the transaction has been finalized.
6333 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
6335 struct nft_base_chain *basechain;
6337 if (nft_trans_chain_policy(trans) != NF_DROP)
6340 if (!nft_is_base_chain(trans->ctx.chain))
6343 basechain = nft_base_chain(trans->ctx.chain);
6344 basechain->policy = NF_DROP;
6347 static void nft_chain_commit_update(struct nft_trans *trans)
6349 struct nft_base_chain *basechain;
6351 if (nft_trans_chain_name(trans)) {
6352 rhltable_remove(&trans->ctx.table->chains_ht,
6353 &trans->ctx.chain->rhlhead,
6354 nft_chain_ht_params);
6355 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
6356 rhltable_insert_key(&trans->ctx.table->chains_ht,
6357 trans->ctx.chain->name,
6358 &trans->ctx.chain->rhlhead,
6359 nft_chain_ht_params);
6362 if (!nft_is_base_chain(trans->ctx.chain))
6365 basechain = nft_base_chain(trans->ctx.chain);
6366 nft_chain_stats_replace(trans->ctx.net, basechain,
6367 nft_trans_chain_stats(trans));
6369 switch (nft_trans_chain_policy(trans)) {
6372 basechain->policy = nft_trans_chain_policy(trans);
6377 static void nft_commit_release(struct nft_trans *trans)
6379 switch (trans->msg_type) {
6380 case NFT_MSG_DELTABLE:
6381 nf_tables_table_destroy(&trans->ctx);
6383 case NFT_MSG_NEWCHAIN:
6384 kfree(nft_trans_chain_name(trans));
6386 case NFT_MSG_DELCHAIN:
6387 nf_tables_chain_destroy(&trans->ctx);
6389 case NFT_MSG_DELRULE:
6390 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6392 case NFT_MSG_DELSET:
6393 nft_set_destroy(nft_trans_set(trans));
6395 case NFT_MSG_DELSETELEM:
6396 nf_tables_set_elem_destroy(&trans->ctx,
6397 nft_trans_elem_set(trans),
6398 nft_trans_elem(trans).priv);
6400 case NFT_MSG_DELOBJ:
6401 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6403 case NFT_MSG_DELFLOWTABLE:
6404 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6409 put_net(trans->ctx.net);
6414 static void nf_tables_trans_destroy_work(struct work_struct *w)
6416 struct nft_trans *trans, *next;
6419 spin_lock(&nf_tables_destroy_list_lock);
6420 list_splice_init(&nf_tables_destroy_list, &head);
6421 spin_unlock(&nf_tables_destroy_list_lock);
6423 if (list_empty(&head))
6428 list_for_each_entry_safe(trans, next, &head, list) {
6429 list_del(&trans->list);
6430 nft_commit_release(trans);
6434 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
6436 struct nft_rule *rule;
6437 unsigned int alloc = 0;
6440 /* already handled or inactive chain? */
6441 if (chain->rules_next || !nft_is_active_next(net, chain))
6444 rule = list_entry(&chain->rules, struct nft_rule, list);
6447 list_for_each_entry_continue(rule, &chain->rules, list) {
6448 if (nft_is_active_next(net, rule))
6452 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
6453 if (!chain->rules_next)
6456 list_for_each_entry_continue(rule, &chain->rules, list) {
6457 if (nft_is_active_next(net, rule))
6458 chain->rules_next[i++] = rule;
6461 chain->rules_next[i] = NULL;
6465 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
6467 struct nft_trans *trans, *next;
6469 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6470 struct nft_chain *chain = trans->ctx.chain;
6472 if (trans->msg_type == NFT_MSG_NEWRULE ||
6473 trans->msg_type == NFT_MSG_DELRULE) {
6474 kvfree(chain->rules_next);
6475 chain->rules_next = NULL;
6480 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
6482 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
6487 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
6489 struct nft_rule **r = rules;
6490 struct nft_rules_old *old;
6495 r++; /* rcu_head is after end marker */
6499 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
6502 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
6504 struct nft_rule **g0, **g1;
6507 next_genbit = nft_gencursor_next(net);
6509 g0 = rcu_dereference_protected(chain->rules_gen_0,
6510 lockdep_commit_lock_is_held(net));
6511 g1 = rcu_dereference_protected(chain->rules_gen_1,
6512 lockdep_commit_lock_is_held(net));
6514 /* No changes to this chain? */
6515 if (chain->rules_next == NULL) {
6516 /* chain had no change in last or next generation */
6520 * chain had no change in this generation; make sure next
6521 * one uses same rules as current generation.
6524 rcu_assign_pointer(chain->rules_gen_1, g0);
6525 nf_tables_commit_chain_free_rules_old(g1);
6527 rcu_assign_pointer(chain->rules_gen_0, g1);
6528 nf_tables_commit_chain_free_rules_old(g0);
6535 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
6537 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
6539 chain->rules_next = NULL;
6545 nf_tables_commit_chain_free_rules_old(g1);
6547 nf_tables_commit_chain_free_rules_old(g0);
6550 static void nft_obj_del(struct nft_object *obj)
6552 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
6553 list_del_rcu(&obj->list);
6556 static void nft_chain_del(struct nft_chain *chain)
6558 struct nft_table *table = chain->table;
6560 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
6561 nft_chain_ht_params));
6562 list_del_rcu(&chain->list);
6565 static void nf_tables_commit_release(struct net *net)
6567 struct nft_trans *trans;
6569 /* all side effects have to be made visible.
6570 * For example, if a chain named 'foo' has been deleted, a
6571 * new transaction must not find it anymore.
6573 * Memory reclaim happens asynchronously from work queue
6574 * to prevent expensive synchronize_rcu() in commit phase.
6576 if (list_empty(&net->nft.commit_list)) {
6577 mutex_unlock(&net->nft.commit_mutex);
6581 trans = list_last_entry(&net->nft.commit_list,
6582 struct nft_trans, list);
6583 get_net(trans->ctx.net);
6584 WARN_ON_ONCE(trans->put_net);
6586 trans->put_net = true;
6587 spin_lock(&nf_tables_destroy_list_lock);
6588 list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
6589 spin_unlock(&nf_tables_destroy_list_lock);
6591 mutex_unlock(&net->nft.commit_mutex);
6593 schedule_work(&trans_destroy_work);
6596 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
6598 struct nft_trans *trans, *next;
6599 struct nft_trans_elem *te;
6600 struct nft_chain *chain;
6601 struct nft_table *table;
6603 if (list_empty(&net->nft.commit_list)) {
6604 mutex_unlock(&net->nft.commit_mutex);
6608 /* 0. Validate ruleset, otherwise roll back for error reporting. */
6609 if (nf_tables_validate(net) < 0)
6612 /* 1. Allocate space for next generation rules_gen_X[] */
6613 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6616 if (trans->msg_type == NFT_MSG_NEWRULE ||
6617 trans->msg_type == NFT_MSG_DELRULE) {
6618 chain = trans->ctx.chain;
6620 ret = nf_tables_commit_chain_prepare(net, chain);
6622 nf_tables_commit_chain_prepare_cancel(net);
6628 /* step 2. Make rules_gen_X visible to packet path */
6629 list_for_each_entry(table, &net->nft.tables, list) {
6630 list_for_each_entry(chain, &table->chains, list)
6631 nf_tables_commit_chain(net, chain);
6635 * Bump generation counter, invalidate any dump in progress.
6636 * Cannot fail after this point.
6638 while (++net->nft.base_seq == 0);
6640 /* step 3. Start new generation, rules_gen_X now in use. */
6641 net->nft.gencursor = nft_gencursor_next(net);
6643 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6644 switch (trans->msg_type) {
6645 case NFT_MSG_NEWTABLE:
6646 if (nft_trans_table_update(trans)) {
6647 if (!nft_trans_table_enable(trans)) {
6648 nf_tables_table_disable(net,
6650 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6653 nft_clear(net, trans->ctx.table);
6655 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
6656 nft_trans_destroy(trans);
6658 case NFT_MSG_DELTABLE:
6659 list_del_rcu(&trans->ctx.table->list);
6660 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
6662 case NFT_MSG_NEWCHAIN:
6663 if (nft_trans_chain_update(trans)) {
6664 nft_chain_commit_update(trans);
6665 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6666 /* trans destroyed after rcu grace period */
6668 nft_chain_commit_drop_policy(trans);
6669 nft_clear(net, trans->ctx.chain);
6670 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6671 nft_trans_destroy(trans);
6674 case NFT_MSG_DELCHAIN:
6675 nft_chain_del(trans->ctx.chain);
6676 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
6677 nf_tables_unregister_hook(trans->ctx.net,
6681 case NFT_MSG_NEWRULE:
6682 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6683 nf_tables_rule_notify(&trans->ctx,
6684 nft_trans_rule(trans),
6686 nft_trans_destroy(trans);
6688 case NFT_MSG_DELRULE:
6689 list_del_rcu(&nft_trans_rule(trans)->list);
6690 nf_tables_rule_notify(&trans->ctx,
6691 nft_trans_rule(trans),
6693 nft_rule_expr_deactivate(&trans->ctx,
6694 nft_trans_rule(trans),
6697 case NFT_MSG_NEWSET:
6698 nft_clear(net, nft_trans_set(trans));
6699 /* This avoids hitting -EBUSY when deleting the table
6700 * from the transaction.
6702 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
6703 !list_empty(&nft_trans_set(trans)->bindings))
6704 trans->ctx.table->use--;
6706 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6707 NFT_MSG_NEWSET, GFP_KERNEL);
6708 nft_trans_destroy(trans);
6710 case NFT_MSG_DELSET:
6711 list_del_rcu(&nft_trans_set(trans)->list);
6712 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6713 NFT_MSG_DELSET, GFP_KERNEL);
6715 case NFT_MSG_NEWSETELEM:
6716 te = (struct nft_trans_elem *)trans->data;
6718 te->set->ops->activate(net, te->set, &te->elem);
6719 nf_tables_setelem_notify(&trans->ctx, te->set,
6721 NFT_MSG_NEWSETELEM, 0);
6722 nft_trans_destroy(trans);
6724 case NFT_MSG_DELSETELEM:
6725 te = (struct nft_trans_elem *)trans->data;
6727 nf_tables_setelem_notify(&trans->ctx, te->set,
6729 NFT_MSG_DELSETELEM, 0);
6730 te->set->ops->remove(net, te->set, &te->elem);
6731 atomic_dec(&te->set->nelems);
6734 case NFT_MSG_NEWOBJ:
6735 nft_clear(net, nft_trans_obj(trans));
6736 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6738 nft_trans_destroy(trans);
6740 case NFT_MSG_DELOBJ:
6741 nft_obj_del(nft_trans_obj(trans));
6742 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6745 case NFT_MSG_NEWFLOWTABLE:
6746 nft_clear(net, nft_trans_flowtable(trans));
6747 nf_tables_flowtable_notify(&trans->ctx,
6748 nft_trans_flowtable(trans),
6749 NFT_MSG_NEWFLOWTABLE);
6750 nft_trans_destroy(trans);
6752 case NFT_MSG_DELFLOWTABLE:
6753 list_del_rcu(&nft_trans_flowtable(trans)->list);
6754 nf_tables_flowtable_notify(&trans->ctx,
6755 nft_trans_flowtable(trans),
6756 NFT_MSG_DELFLOWTABLE);
6757 nft_unregister_flowtable_net_hooks(net,
6758 nft_trans_flowtable(trans));
6763 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
6764 nf_tables_commit_release(net);
6769 static void nf_tables_abort_release(struct nft_trans *trans)
6771 switch (trans->msg_type) {
6772 case NFT_MSG_NEWTABLE:
6773 nf_tables_table_destroy(&trans->ctx);
6775 case NFT_MSG_NEWCHAIN:
6776 nf_tables_chain_destroy(&trans->ctx);
6778 case NFT_MSG_NEWRULE:
6779 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6781 case NFT_MSG_NEWSET:
6782 nft_set_destroy(nft_trans_set(trans));
6784 case NFT_MSG_NEWSETELEM:
6785 nft_set_elem_destroy(nft_trans_elem_set(trans),
6786 nft_trans_elem(trans).priv, true);
6788 case NFT_MSG_NEWOBJ:
6789 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6791 case NFT_MSG_NEWFLOWTABLE:
6792 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6798 static int __nf_tables_abort(struct net *net)
6800 struct nft_trans *trans, *next;
6801 struct nft_trans_elem *te;
6803 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
6805 switch (trans->msg_type) {
6806 case NFT_MSG_NEWTABLE:
6807 if (nft_trans_table_update(trans)) {
6808 if (nft_trans_table_enable(trans)) {
6809 nf_tables_table_disable(net,
6811 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6813 nft_trans_destroy(trans);
6815 list_del_rcu(&trans->ctx.table->list);
6818 case NFT_MSG_DELTABLE:
6819 nft_clear(trans->ctx.net, trans->ctx.table);
6820 nft_trans_destroy(trans);
6822 case NFT_MSG_NEWCHAIN:
6823 if (nft_trans_chain_update(trans)) {
6824 free_percpu(nft_trans_chain_stats(trans));
6825 kfree(nft_trans_chain_name(trans));
6826 nft_trans_destroy(trans);
6828 trans->ctx.table->use--;
6829 nft_chain_del(trans->ctx.chain);
6830 nf_tables_unregister_hook(trans->ctx.net,
6835 case NFT_MSG_DELCHAIN:
6836 trans->ctx.table->use++;
6837 nft_clear(trans->ctx.net, trans->ctx.chain);
6838 nft_trans_destroy(trans);
6840 case NFT_MSG_NEWRULE:
6841 trans->ctx.chain->use--;
6842 list_del_rcu(&nft_trans_rule(trans)->list);
6843 nft_rule_expr_deactivate(&trans->ctx,
6844 nft_trans_rule(trans),
6847 case NFT_MSG_DELRULE:
6848 trans->ctx.chain->use++;
6849 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6850 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
6851 nft_trans_destroy(trans);
6853 case NFT_MSG_NEWSET:
6854 trans->ctx.table->use--;
6855 if (nft_trans_set(trans)->bound) {
6856 nft_trans_destroy(trans);
6859 list_del_rcu(&nft_trans_set(trans)->list);
6861 case NFT_MSG_DELSET:
6862 trans->ctx.table->use++;
6863 nft_clear(trans->ctx.net, nft_trans_set(trans));
6864 nft_trans_destroy(trans);
6866 case NFT_MSG_NEWSETELEM:
6867 if (nft_trans_elem_set(trans)->bound) {
6868 nft_trans_destroy(trans);
6871 te = (struct nft_trans_elem *)trans->data;
6872 te->set->ops->remove(net, te->set, &te->elem);
6873 atomic_dec(&te->set->nelems);
6875 case NFT_MSG_DELSETELEM:
6876 te = (struct nft_trans_elem *)trans->data;
6878 nft_set_elem_activate(net, te->set, &te->elem);
6879 te->set->ops->activate(net, te->set, &te->elem);
6882 nft_trans_destroy(trans);
6884 case NFT_MSG_NEWOBJ:
6885 trans->ctx.table->use--;
6886 nft_obj_del(nft_trans_obj(trans));
6888 case NFT_MSG_DELOBJ:
6889 trans->ctx.table->use++;
6890 nft_clear(trans->ctx.net, nft_trans_obj(trans));
6891 nft_trans_destroy(trans);
6893 case NFT_MSG_NEWFLOWTABLE:
6894 trans->ctx.table->use--;
6895 list_del_rcu(&nft_trans_flowtable(trans)->list);
6896 nft_unregister_flowtable_net_hooks(net,
6897 nft_trans_flowtable(trans));
6899 case NFT_MSG_DELFLOWTABLE:
6900 trans->ctx.table->use++;
6901 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
6902 nft_trans_destroy(trans);
6909 list_for_each_entry_safe_reverse(trans, next,
6910 &net->nft.commit_list, list) {
6911 list_del(&trans->list);
6912 nf_tables_abort_release(trans);
6918 static void nf_tables_cleanup(struct net *net)
6920 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
6923 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
6925 int ret = __nf_tables_abort(net);
6927 mutex_unlock(&net->nft.commit_mutex);
6932 static bool nf_tables_valid_genid(struct net *net, u32 genid)
6936 mutex_lock(&net->nft.commit_mutex);
6938 genid_ok = genid == 0 || net->nft.base_seq == genid;
6940 mutex_unlock(&net->nft.commit_mutex);
6942 /* else, commit mutex has to be released by commit or abort function */
6946 static const struct nfnetlink_subsystem nf_tables_subsys = {
6947 .name = "nf_tables",
6948 .subsys_id = NFNL_SUBSYS_NFTABLES,
6949 .cb_count = NFT_MSG_MAX,
6951 .commit = nf_tables_commit,
6952 .abort = nf_tables_abort,
6953 .cleanup = nf_tables_cleanup,
6954 .valid_genid = nf_tables_valid_genid,
6955 .owner = THIS_MODULE,
6958 int nft_chain_validate_dependency(const struct nft_chain *chain,
6959 enum nft_chain_types type)
6961 const struct nft_base_chain *basechain;
6963 if (nft_is_base_chain(chain)) {
6964 basechain = nft_base_chain(chain);
6965 if (basechain->type->type != type)
6970 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
6972 int nft_chain_validate_hooks(const struct nft_chain *chain,
6973 unsigned int hook_flags)
6975 struct nft_base_chain *basechain;
6977 if (nft_is_base_chain(chain)) {
6978 basechain = nft_base_chain(chain);
6980 if ((1 << basechain->ops.hooknum) & hook_flags)
6988 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
6991 * Loop detection - walk through the ruleset beginning at the destination chain
6992 * of a new jump until either the source chain is reached (loop) or all
6993 * reachable chains have been traversed.
6995 * The loop check is performed whenever a new jump verdict is added to an
6996 * expression or verdict map or a verdict map is bound to a new chain.
6999 static int nf_tables_check_loops(const struct nft_ctx *ctx,
7000 const struct nft_chain *chain);
7002 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
7003 struct nft_set *set,
7004 const struct nft_set_iter *iter,
7005 struct nft_set_elem *elem)
7007 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
7008 const struct nft_data *data;
7010 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
7011 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
7014 data = nft_set_ext_data(ext);
7015 switch (data->verdict.code) {
7018 return nf_tables_check_loops(ctx, data->verdict.chain);
7024 static int nf_tables_check_loops(const struct nft_ctx *ctx,
7025 const struct nft_chain *chain)
7027 const struct nft_rule *rule;
7028 const struct nft_expr *expr, *last;
7029 struct nft_set *set;
7030 struct nft_set_binding *binding;
7031 struct nft_set_iter iter;
7033 if (ctx->chain == chain)
7036 list_for_each_entry(rule, &chain->rules, list) {
7037 nft_rule_for_each_expr(expr, last, rule) {
7038 struct nft_immediate_expr *priv;
7039 const struct nft_data *data;
7042 if (strcmp(expr->ops->type->name, "immediate"))
7045 priv = nft_expr_priv(expr);
7046 if (priv->dreg != NFT_REG_VERDICT)
7050 switch (data->verdict.code) {
7053 err = nf_tables_check_loops(ctx,
7054 data->verdict.chain);
7063 list_for_each_entry(set, &ctx->table->sets, list) {
7064 if (!nft_is_active_next(ctx->net, set))
7066 if (!(set->flags & NFT_SET_MAP) ||
7067 set->dtype != NFT_DATA_VERDICT)
7070 list_for_each_entry(binding, &set->bindings, list) {
7071 if (!(binding->flags & NFT_SET_MAP) ||
7072 binding->chain != chain)
7075 iter.genmask = nft_genmask_next(ctx->net);
7079 iter.fn = nf_tables_loop_check_setelem;
7081 set->ops->walk(ctx, set, &iter);
7091 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
7093 * @attr: netlink attribute to fetch value from
7094 * @max: maximum value to be stored in dest
7095 * @dest: pointer to the variable
7097 * Parse, check and store a given u32 netlink attribute into variable.
7098 * This function returns -ERANGE if the value goes over maximum value.
7099 * Otherwise a 0 is returned and the attribute value is stored in the
7100 * destination variable.
7102 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
7106 val = ntohl(nla_get_be32(attr));
7113 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
7116 * nft_parse_register - parse a register value from a netlink attribute
7118 * @attr: netlink attribute
7120 * Parse and translate a register value from a netlink attribute.
7121 * Registers used to be 128 bit wide, these register numbers will be
7122 * mapped to the corresponding 32 bit register numbers.
7124 unsigned int nft_parse_register(const struct nlattr *attr)
7128 reg = ntohl(nla_get_be32(attr));
7130 case NFT_REG_VERDICT...NFT_REG_4:
7131 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
7133 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
7136 EXPORT_SYMBOL_GPL(nft_parse_register);
7139 * nft_dump_register - dump a register value to a netlink attribute
7141 * @skb: socket buffer
7142 * @attr: attribute number
7143 * @reg: register number
7145 * Construct a netlink attribute containing the register number. For
7146 * compatibility reasons, register numbers being a multiple of 4 are
7147 * translated to the corresponding 128 bit register numbers.
7149 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
7151 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
7152 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
7154 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
7156 return nla_put_be32(skb, attr, htonl(reg));
7158 EXPORT_SYMBOL_GPL(nft_dump_register);
7161 * nft_validate_register_load - validate a load from a register
7163 * @reg: the register number
7164 * @len: the length of the data
7166 * Validate that the input register is one of the general purpose
7167 * registers and that the length of the load is within the bounds.
7169 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
7171 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7175 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
7180 EXPORT_SYMBOL_GPL(nft_validate_register_load);
7183 * nft_validate_register_store - validate an expressions' register store
7185 * @ctx: context of the expression performing the load
7186 * @reg: the destination register number
7187 * @data: the data to load
7188 * @type: the data type
7189 * @len: the length of the data
7191 * Validate that a data load uses the appropriate data type for
7192 * the destination register and the length is within the bounds.
7193 * A value of NULL for the data means that its runtime gathered
7196 int nft_validate_register_store(const struct nft_ctx *ctx,
7197 enum nft_registers reg,
7198 const struct nft_data *data,
7199 enum nft_data_types type, unsigned int len)
7204 case NFT_REG_VERDICT:
7205 if (type != NFT_DATA_VERDICT)
7209 (data->verdict.code == NFT_GOTO ||
7210 data->verdict.code == NFT_JUMP)) {
7211 err = nf_tables_check_loops(ctx, data->verdict.chain);
7218 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7222 if (reg * NFT_REG32_SIZE + len >
7223 FIELD_SIZEOF(struct nft_regs, data))
7226 if (data != NULL && type != NFT_DATA_VALUE)
7231 EXPORT_SYMBOL_GPL(nft_validate_register_store);
7233 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
7234 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
7235 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
7236 .len = NFT_CHAIN_MAXNAMELEN - 1 },
7239 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
7240 struct nft_data_desc *desc, const struct nlattr *nla)
7242 u8 genmask = nft_genmask_next(ctx->net);
7243 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
7244 struct nft_chain *chain;
7247 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
7248 nft_verdict_policy, NULL);
7252 if (!tb[NFTA_VERDICT_CODE])
7254 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
7256 switch (data->verdict.code) {
7258 switch (data->verdict.code & NF_VERDICT_MASK) {
7273 if (!tb[NFTA_VERDICT_CHAIN])
7275 chain = nft_chain_lookup(ctx->net, ctx->table,
7276 tb[NFTA_VERDICT_CHAIN], genmask);
7278 return PTR_ERR(chain);
7279 if (nft_is_base_chain(chain))
7283 data->verdict.chain = chain;
7287 desc->len = sizeof(data->verdict);
7288 desc->type = NFT_DATA_VERDICT;
7292 static void nft_verdict_uninit(const struct nft_data *data)
7294 switch (data->verdict.code) {
7297 data->verdict.chain->use--;
7302 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
7304 struct nlattr *nest;
7306 nest = nla_nest_start_noflag(skb, type);
7308 goto nla_put_failure;
7310 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
7311 goto nla_put_failure;
7316 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
7318 goto nla_put_failure;
7320 nla_nest_end(skb, nest);
7327 static int nft_value_init(const struct nft_ctx *ctx,
7328 struct nft_data *data, unsigned int size,
7329 struct nft_data_desc *desc, const struct nlattr *nla)
7339 nla_memcpy(data->data, nla, len);
7340 desc->type = NFT_DATA_VALUE;
7345 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
7348 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
7351 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
7352 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
7353 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
7357 * nft_data_init - parse nf_tables data netlink attributes
7359 * @ctx: context of the expression using the data
7360 * @data: destination struct nft_data
7361 * @size: maximum data length
7362 * @desc: data description
7363 * @nla: netlink attribute containing data
7365 * Parse the netlink data attributes and initialize a struct nft_data.
7366 * The type and length of data are returned in the data description.
7368 * The caller can indicate that it only wants to accept data of type
7369 * NFT_DATA_VALUE by passing NULL for the ctx argument.
7371 int nft_data_init(const struct nft_ctx *ctx,
7372 struct nft_data *data, unsigned int size,
7373 struct nft_data_desc *desc, const struct nlattr *nla)
7375 struct nlattr *tb[NFTA_DATA_MAX + 1];
7378 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
7379 nft_data_policy, NULL);
7383 if (tb[NFTA_DATA_VALUE])
7384 return nft_value_init(ctx, data, size, desc,
7385 tb[NFTA_DATA_VALUE]);
7386 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
7387 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
7390 EXPORT_SYMBOL_GPL(nft_data_init);
7393 * nft_data_release - release a nft_data item
7395 * @data: struct nft_data to release
7396 * @type: type of data
7398 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7399 * all others need to be released by calling this function.
7401 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
7403 if (type < NFT_DATA_VERDICT)
7406 case NFT_DATA_VERDICT:
7407 return nft_verdict_uninit(data);
7412 EXPORT_SYMBOL_GPL(nft_data_release);
7414 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
7415 enum nft_data_types type, unsigned int len)
7417 struct nlattr *nest;
7420 nest = nla_nest_start_noflag(skb, attr);
7425 case NFT_DATA_VALUE:
7426 err = nft_value_dump(skb, data, len);
7428 case NFT_DATA_VERDICT:
7429 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
7436 nla_nest_end(skb, nest);
7439 EXPORT_SYMBOL_GPL(nft_data_dump);
7441 int __nft_release_basechain(struct nft_ctx *ctx)
7443 struct nft_rule *rule, *nr;
7445 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
7448 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
7449 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
7450 list_del(&rule->list);
7452 nf_tables_rule_release(ctx, rule);
7454 nft_chain_del(ctx->chain);
7456 nf_tables_chain_destroy(ctx);
7460 EXPORT_SYMBOL_GPL(__nft_release_basechain);
7462 static void __nft_release_tables(struct net *net)
7464 struct nft_flowtable *flowtable, *nf;
7465 struct nft_table *table, *nt;
7466 struct nft_chain *chain, *nc;
7467 struct nft_object *obj, *ne;
7468 struct nft_rule *rule, *nr;
7469 struct nft_set *set, *ns;
7470 struct nft_ctx ctx = {
7472 .family = NFPROTO_NETDEV,
7475 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
7476 ctx.family = table->family;
7478 list_for_each_entry(chain, &table->chains, list)
7479 nf_tables_unregister_hook(net, table, chain);
7480 /* No packets are walking on these chains anymore. */
7482 list_for_each_entry(chain, &table->chains, list) {
7484 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
7485 list_del(&rule->list);
7487 nf_tables_rule_release(&ctx, rule);
7490 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
7491 list_del(&flowtable->list);
7493 nf_tables_flowtable_destroy(flowtable);
7495 list_for_each_entry_safe(set, ns, &table->sets, list) {
7496 list_del(&set->list);
7498 nft_set_destroy(set);
7500 list_for_each_entry_safe(obj, ne, &table->objects, list) {
7503 nft_obj_destroy(&ctx, obj);
7505 list_for_each_entry_safe(chain, nc, &table->chains, list) {
7507 nft_chain_del(chain);
7509 nf_tables_chain_destroy(&ctx);
7511 list_del(&table->list);
7512 nf_tables_table_destroy(&ctx);
7516 static int __net_init nf_tables_init_net(struct net *net)
7518 INIT_LIST_HEAD(&net->nft.tables);
7519 INIT_LIST_HEAD(&net->nft.commit_list);
7520 mutex_init(&net->nft.commit_mutex);
7521 net->nft.base_seq = 1;
7522 net->nft.validate_state = NFT_VALIDATE_SKIP;
7527 static void __net_exit nf_tables_exit_net(struct net *net)
7529 mutex_lock(&net->nft.commit_mutex);
7530 if (!list_empty(&net->nft.commit_list))
7531 __nf_tables_abort(net);
7532 __nft_release_tables(net);
7533 mutex_unlock(&net->nft.commit_mutex);
7534 WARN_ON_ONCE(!list_empty(&net->nft.tables));
7537 static struct pernet_operations nf_tables_net_ops = {
7538 .init = nf_tables_init_net,
7539 .exit = nf_tables_exit_net,
7542 static int __init nf_tables_module_init(void)
7546 spin_lock_init(&nf_tables_destroy_list_lock);
7547 err = register_pernet_subsys(&nf_tables_net_ops);
7551 err = nft_chain_filter_init();
7555 err = nf_tables_core_module_init();
7559 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
7563 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
7568 err = nfnetlink_subsys_register(&nf_tables_subsys);
7572 nft_chain_route_init();
7575 rhltable_destroy(&nft_objname_ht);
7577 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7579 nf_tables_core_module_exit();
7581 nft_chain_filter_fini();
7583 unregister_pernet_subsys(&nf_tables_net_ops);
7587 static void __exit nf_tables_module_exit(void)
7589 nfnetlink_subsys_unregister(&nf_tables_subsys);
7590 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7591 nft_chain_filter_fini();
7592 nft_chain_route_fini();
7593 unregister_pernet_subsys(&nf_tables_net_ops);
7594 cancel_work_sync(&trans_destroy_work);
7596 rhltable_destroy(&nft_objname_ht);
7597 nf_tables_core_module_exit();
7600 module_init(nf_tables_module_init);
7601 module_exit(nf_tables_module_exit);
7603 MODULE_LICENSE("GPL");
7604 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
7605 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);