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 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
29 static LIST_HEAD(nf_tables_expressions);
30 static LIST_HEAD(nf_tables_objects);
31 static LIST_HEAD(nf_tables_flowtables);
32 static u64 table_handle;
35 NFT_VALIDATE_SKIP = 0,
40 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
41 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
42 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
44 static const struct rhashtable_params nft_chain_ht_params = {
45 .head_offset = offsetof(struct nft_chain, rhlhead),
46 .key_offset = offsetof(struct nft_chain, name),
47 .hashfn = nft_chain_hash,
48 .obj_hashfn = nft_chain_hash_obj,
49 .obj_cmpfn = nft_chain_hash_cmp,
51 .automatic_shrinking = true,
54 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
56 switch (net->nft.validate_state) {
57 case NFT_VALIDATE_SKIP:
58 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
60 case NFT_VALIDATE_NEED:
63 if (new_validate_state == NFT_VALIDATE_NEED)
67 net->nft.validate_state = new_validate_state;
70 static void nft_ctx_init(struct nft_ctx *ctx,
72 const struct sk_buff *skb,
73 const struct nlmsghdr *nlh,
75 struct nft_table *table,
76 struct nft_chain *chain,
77 const struct nlattr * const *nla)
85 ctx->portid = NETLINK_CB(skb).portid;
86 ctx->report = nlmsg_report(nlh);
87 ctx->seq = nlh->nlmsg_seq;
90 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
91 int msg_type, u32 size, gfp_t gfp)
93 struct nft_trans *trans;
95 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
99 INIT_LIST_HEAD(&trans->list);
100 trans->msg_type = msg_type;
106 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
107 int msg_type, u32 size)
109 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
112 static void nft_trans_destroy(struct nft_trans *trans)
114 list_del(&trans->list);
118 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
120 struct net *net = ctx->net;
121 struct nft_trans *trans;
123 if (!nft_set_is_anonymous(set))
126 list_for_each_entry_reverse(trans, &net->nft.commit_list, list) {
127 switch (trans->msg_type) {
129 if (nft_trans_set(trans) == set)
130 nft_trans_set_bound(trans) = true;
132 case NFT_MSG_NEWSETELEM:
133 if (nft_trans_elem_set(trans) == set)
134 nft_trans_elem_set_bound(trans) = true;
140 static int nf_tables_register_hook(struct net *net,
141 const struct nft_table *table,
142 struct nft_chain *chain)
144 const struct nft_base_chain *basechain;
145 const struct nf_hook_ops *ops;
147 if (table->flags & NFT_TABLE_F_DORMANT ||
148 !nft_is_base_chain(chain))
151 basechain = nft_base_chain(chain);
152 ops = &basechain->ops;
154 if (basechain->type->ops_register)
155 return basechain->type->ops_register(net, ops);
157 return nf_register_net_hook(net, ops);
160 static void nf_tables_unregister_hook(struct net *net,
161 const struct nft_table *table,
162 struct nft_chain *chain)
164 const struct nft_base_chain *basechain;
165 const struct nf_hook_ops *ops;
167 if (table->flags & NFT_TABLE_F_DORMANT ||
168 !nft_is_base_chain(chain))
170 basechain = nft_base_chain(chain);
171 ops = &basechain->ops;
173 if (basechain->type->ops_unregister)
174 return basechain->type->ops_unregister(net, ops);
176 nf_unregister_net_hook(net, ops);
179 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
181 struct nft_trans *trans;
183 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
187 if (msg_type == NFT_MSG_NEWTABLE)
188 nft_activate_next(ctx->net, ctx->table);
190 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
194 static int nft_deltable(struct nft_ctx *ctx)
198 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
202 nft_deactivate_next(ctx->net, ctx->table);
206 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
208 struct nft_trans *trans;
210 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
214 if (msg_type == NFT_MSG_NEWCHAIN)
215 nft_activate_next(ctx->net, ctx->chain);
217 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
221 static int nft_delchain(struct nft_ctx *ctx)
225 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
230 nft_deactivate_next(ctx->net, ctx->chain);
235 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
236 struct nft_rule *rule)
238 struct nft_expr *expr;
240 expr = nft_expr_first(rule);
241 while (expr != nft_expr_last(rule) && expr->ops) {
242 if (expr->ops->activate)
243 expr->ops->activate(ctx, expr);
245 expr = nft_expr_next(expr);
249 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
250 struct nft_rule *rule,
251 enum nft_trans_phase phase)
253 struct nft_expr *expr;
255 expr = nft_expr_first(rule);
256 while (expr != nft_expr_last(rule) && expr->ops) {
257 if (expr->ops->deactivate)
258 expr->ops->deactivate(ctx, expr, phase);
260 expr = nft_expr_next(expr);
265 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
267 /* You cannot delete the same rule twice */
268 if (nft_is_active_next(ctx->net, rule)) {
269 nft_deactivate_next(ctx->net, rule);
276 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
277 struct nft_rule *rule)
279 struct nft_trans *trans;
281 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
285 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
286 nft_trans_rule_id(trans) =
287 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
289 nft_trans_rule(trans) = rule;
290 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
295 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
297 struct nft_trans *trans;
300 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
304 err = nf_tables_delrule_deactivate(ctx, rule);
306 nft_trans_destroy(trans);
309 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
314 static int nft_delrule_by_chain(struct nft_ctx *ctx)
316 struct nft_rule *rule;
319 list_for_each_entry(rule, &ctx->chain->rules, list) {
320 if (!nft_is_active_next(ctx->net, rule))
323 err = nft_delrule(ctx, rule);
330 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
333 struct nft_trans *trans;
335 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
339 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
340 nft_trans_set_id(trans) =
341 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
342 nft_activate_next(ctx->net, set);
344 nft_trans_set(trans) = set;
345 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
350 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
354 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
358 nft_deactivate_next(ctx->net, set);
364 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
365 struct nft_object *obj)
367 struct nft_trans *trans;
369 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
373 if (msg_type == NFT_MSG_NEWOBJ)
374 nft_activate_next(ctx->net, obj);
376 nft_trans_obj(trans) = obj;
377 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
382 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
386 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
390 nft_deactivate_next(ctx->net, obj);
396 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
397 struct nft_flowtable *flowtable)
399 struct nft_trans *trans;
401 trans = nft_trans_alloc(ctx, msg_type,
402 sizeof(struct nft_trans_flowtable));
406 if (msg_type == NFT_MSG_NEWFLOWTABLE)
407 nft_activate_next(ctx->net, flowtable);
409 nft_trans_flowtable(trans) = flowtable;
410 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
415 static int nft_delflowtable(struct nft_ctx *ctx,
416 struct nft_flowtable *flowtable)
420 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
424 nft_deactivate_next(ctx->net, flowtable);
434 static struct nft_table *nft_table_lookup(const struct net *net,
435 const struct nlattr *nla,
436 u8 family, u8 genmask)
438 struct nft_table *table;
441 return ERR_PTR(-EINVAL);
443 list_for_each_entry_rcu(table, &net->nft.tables, list) {
444 if (!nla_strcmp(nla, table->name) &&
445 table->family == family &&
446 nft_active_genmask(table, genmask))
450 return ERR_PTR(-ENOENT);
453 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
454 const struct nlattr *nla,
457 struct nft_table *table;
459 list_for_each_entry(table, &net->nft.tables, list) {
460 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
461 nft_active_genmask(table, genmask))
465 return ERR_PTR(-ENOENT);
468 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
470 return ++table->hgenerator;
473 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
475 static const struct nft_chain_type *
476 __nft_chain_type_get(u8 family, enum nft_chain_types type)
478 if (family >= NFPROTO_NUMPROTO ||
479 type >= NFT_CHAIN_T_MAX)
482 return chain_type[family][type];
485 static const struct nft_chain_type *
486 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
488 const struct nft_chain_type *type;
491 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
492 type = __nft_chain_type_get(family, i);
495 if (!nla_strcmp(nla, type->name))
502 * Loading a module requires dropping mutex that guards the transaction.
503 * A different client might race to start a new transaction meanwhile. Zap the
504 * list of pending transaction and then restore it once the mutex is grabbed
505 * again. Users of this function return EAGAIN which implicitly triggers the
506 * transaction abort path to clean up the list of pending transactions.
508 #ifdef CONFIG_MODULES
509 static void nft_request_module(struct net *net, const char *fmt, ...)
511 char module_name[MODULE_NAME_LEN];
512 LIST_HEAD(commit_list);
516 list_splice_init(&net->nft.commit_list, &commit_list);
519 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
521 if (ret >= MODULE_NAME_LEN)
524 mutex_unlock(&net->nft.commit_mutex);
525 request_module("%s", module_name);
526 mutex_lock(&net->nft.commit_mutex);
528 WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
529 list_splice(&commit_list, &net->nft.commit_list);
533 static void lockdep_nfnl_nft_mutex_not_held(void)
535 #ifdef CONFIG_PROVE_LOCKING
537 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
541 static const struct nft_chain_type *
542 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
543 u8 family, bool autoload)
545 const struct nft_chain_type *type;
547 type = __nf_tables_chain_type_lookup(nla, family);
551 lockdep_nfnl_nft_mutex_not_held();
552 #ifdef CONFIG_MODULES
554 nft_request_module(net, "nft-chain-%u-%.*s", family,
555 nla_len(nla), (const char *)nla_data(nla));
556 type = __nf_tables_chain_type_lookup(nla, family);
558 return ERR_PTR(-EAGAIN);
561 return ERR_PTR(-ENOENT);
564 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
565 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
566 .len = NFT_TABLE_MAXNAMELEN - 1 },
567 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
568 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
571 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
572 u32 portid, u32 seq, int event, u32 flags,
573 int family, const struct nft_table *table)
575 struct nlmsghdr *nlh;
576 struct nfgenmsg *nfmsg;
578 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
579 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
581 goto nla_put_failure;
583 nfmsg = nlmsg_data(nlh);
584 nfmsg->nfgen_family = family;
585 nfmsg->version = NFNETLINK_V0;
586 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
588 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
589 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
590 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
591 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
593 goto nla_put_failure;
599 nlmsg_trim(skb, nlh);
603 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
609 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
612 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
616 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
617 event, 0, ctx->family, ctx->table);
623 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
624 ctx->report, GFP_KERNEL);
627 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
630 static int nf_tables_dump_tables(struct sk_buff *skb,
631 struct netlink_callback *cb)
633 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
634 const struct nft_table *table;
635 unsigned int idx = 0, s_idx = cb->args[0];
636 struct net *net = sock_net(skb->sk);
637 int family = nfmsg->nfgen_family;
640 cb->seq = net->nft.base_seq;
642 list_for_each_entry_rcu(table, &net->nft.tables, list) {
643 if (family != NFPROTO_UNSPEC && family != table->family)
649 memset(&cb->args[1], 0,
650 sizeof(cb->args) - sizeof(cb->args[0]));
651 if (!nft_is_active(net, table))
653 if (nf_tables_fill_table_info(skb, net,
654 NETLINK_CB(cb->skb).portid,
656 NFT_MSG_NEWTABLE, NLM_F_MULTI,
657 table->family, table) < 0)
660 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
670 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
671 const struct nlmsghdr *nlh,
672 struct netlink_dump_control *c)
676 if (!try_module_get(THIS_MODULE))
680 err = netlink_dump_start(nlsk, skb, nlh, c);
682 module_put(THIS_MODULE);
687 /* called with rcu_read_lock held */
688 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
689 struct sk_buff *skb, const struct nlmsghdr *nlh,
690 const struct nlattr * const nla[],
691 struct netlink_ext_ack *extack)
693 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
694 u8 genmask = nft_genmask_cur(net);
695 const struct nft_table *table;
696 struct sk_buff *skb2;
697 int family = nfmsg->nfgen_family;
700 if (nlh->nlmsg_flags & NLM_F_DUMP) {
701 struct netlink_dump_control c = {
702 .dump = nf_tables_dump_tables,
703 .module = THIS_MODULE,
706 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
709 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
711 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
712 return PTR_ERR(table);
715 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
719 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
720 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
723 goto err_fill_table_info;
725 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
732 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
734 struct nft_chain *chain;
737 list_for_each_entry(chain, &table->chains, list) {
738 if (!nft_is_active_next(net, chain))
740 if (!nft_is_base_chain(chain))
743 if (cnt && i++ == cnt)
746 nf_unregister_net_hook(net, &nft_base_chain(chain)->ops);
750 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
752 struct nft_chain *chain;
755 list_for_each_entry(chain, &table->chains, list) {
756 if (!nft_is_active_next(net, chain))
758 if (!nft_is_base_chain(chain))
761 err = nf_register_net_hook(net, &nft_base_chain(chain)->ops);
770 nft_table_disable(net, table, i);
774 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
776 nft_table_disable(net, table, 0);
779 static int nf_tables_updtable(struct nft_ctx *ctx)
781 struct nft_trans *trans;
785 if (!ctx->nla[NFTA_TABLE_FLAGS])
788 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
789 if (flags & ~NFT_TABLE_F_DORMANT)
792 if (flags == ctx->table->flags)
795 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
796 sizeof(struct nft_trans_table));
800 if ((flags & NFT_TABLE_F_DORMANT) &&
801 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
802 nft_trans_table_enable(trans) = false;
803 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
804 ctx->table->flags & NFT_TABLE_F_DORMANT) {
805 ret = nf_tables_table_enable(ctx->net, ctx->table);
807 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
808 nft_trans_table_enable(trans) = true;
814 nft_trans_table_update(trans) = true;
815 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
818 nft_trans_destroy(trans);
822 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
824 const char *name = data;
826 return jhash(name, strlen(name), seed);
829 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
831 const struct nft_chain *chain = data;
833 return nft_chain_hash(chain->name, 0, seed);
836 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
839 const struct nft_chain *chain = ptr;
840 const char *name = arg->key;
842 return strcmp(chain->name, name);
845 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
846 struct sk_buff *skb, const struct nlmsghdr *nlh,
847 const struct nlattr * const nla[],
848 struct netlink_ext_ack *extack)
850 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
851 u8 genmask = nft_genmask_next(net);
852 int family = nfmsg->nfgen_family;
853 const struct nlattr *attr;
854 struct nft_table *table;
859 lockdep_assert_held(&net->nft.commit_mutex);
860 attr = nla[NFTA_TABLE_NAME];
861 table = nft_table_lookup(net, attr, family, genmask);
863 if (PTR_ERR(table) != -ENOENT)
864 return PTR_ERR(table);
866 if (nlh->nlmsg_flags & NLM_F_EXCL) {
867 NL_SET_BAD_ATTR(extack, attr);
870 if (nlh->nlmsg_flags & NLM_F_REPLACE)
873 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
874 return nf_tables_updtable(&ctx);
877 if (nla[NFTA_TABLE_FLAGS]) {
878 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
879 if (flags & ~NFT_TABLE_F_DORMANT)
884 table = kzalloc(sizeof(*table), GFP_KERNEL);
888 table->name = nla_strdup(attr, GFP_KERNEL);
889 if (table->name == NULL)
892 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
896 INIT_LIST_HEAD(&table->chains);
897 INIT_LIST_HEAD(&table->sets);
898 INIT_LIST_HEAD(&table->objects);
899 INIT_LIST_HEAD(&table->flowtables);
900 table->family = family;
901 table->flags = flags;
902 table->handle = ++table_handle;
904 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
905 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
909 list_add_tail_rcu(&table->list, &net->nft.tables);
912 rhltable_destroy(&table->chains_ht);
921 static int nft_flush_table(struct nft_ctx *ctx)
923 struct nft_flowtable *flowtable, *nft;
924 struct nft_chain *chain, *nc;
925 struct nft_object *obj, *ne;
926 struct nft_set *set, *ns;
929 list_for_each_entry(chain, &ctx->table->chains, list) {
930 if (!nft_is_active_next(ctx->net, chain))
935 err = nft_delrule_by_chain(ctx);
940 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
941 if (!nft_is_active_next(ctx->net, set))
944 if (nft_set_is_anonymous(set) &&
945 !list_empty(&set->bindings))
948 err = nft_delset(ctx, set);
953 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
954 if (!nft_is_active_next(ctx->net, flowtable))
957 err = nft_delflowtable(ctx, flowtable);
962 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
963 if (!nft_is_active_next(ctx->net, obj))
966 err = nft_delobj(ctx, obj);
971 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
972 if (!nft_is_active_next(ctx->net, chain))
977 err = nft_delchain(ctx);
982 err = nft_deltable(ctx);
987 static int nft_flush(struct nft_ctx *ctx, int family)
989 struct nft_table *table, *nt;
990 const struct nlattr * const *nla = ctx->nla;
993 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
994 if (family != AF_UNSPEC && table->family != family)
997 ctx->family = table->family;
999 if (!nft_is_active_next(ctx->net, table))
1002 if (nla[NFTA_TABLE_NAME] &&
1003 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1008 err = nft_flush_table(ctx);
1016 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1017 struct sk_buff *skb, const struct nlmsghdr *nlh,
1018 const struct nlattr * const nla[],
1019 struct netlink_ext_ack *extack)
1021 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1022 u8 genmask = nft_genmask_next(net);
1023 int family = nfmsg->nfgen_family;
1024 const struct nlattr *attr;
1025 struct nft_table *table;
1028 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
1029 if (family == AF_UNSPEC ||
1030 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1031 return nft_flush(&ctx, family);
1033 if (nla[NFTA_TABLE_HANDLE]) {
1034 attr = nla[NFTA_TABLE_HANDLE];
1035 table = nft_table_lookup_byhandle(net, attr, genmask);
1037 attr = nla[NFTA_TABLE_NAME];
1038 table = nft_table_lookup(net, attr, family, genmask);
1041 if (IS_ERR(table)) {
1042 NL_SET_BAD_ATTR(extack, attr);
1043 return PTR_ERR(table);
1046 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1050 ctx.family = family;
1053 return nft_flush_table(&ctx);
1056 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1058 if (WARN_ON(ctx->table->use > 0))
1061 rhltable_destroy(&ctx->table->chains_ht);
1062 kfree(ctx->table->name);
1066 void nft_register_chain_type(const struct nft_chain_type *ctype)
1068 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1069 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1070 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1073 chain_type[ctype->family][ctype->type] = ctype;
1074 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1076 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1078 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1080 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1081 chain_type[ctype->family][ctype->type] = NULL;
1082 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1084 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1090 static struct nft_chain *
1091 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1093 struct nft_chain *chain;
1095 list_for_each_entry(chain, &table->chains, list) {
1096 if (chain->handle == handle &&
1097 nft_active_genmask(chain, genmask))
1101 return ERR_PTR(-ENOENT);
1104 static bool lockdep_commit_lock_is_held(struct net *net)
1106 #ifdef CONFIG_PROVE_LOCKING
1107 return lockdep_is_held(&net->nft.commit_mutex);
1113 static struct nft_chain *nft_chain_lookup(struct net *net,
1114 struct nft_table *table,
1115 const struct nlattr *nla, u8 genmask)
1117 char search[NFT_CHAIN_MAXNAMELEN + 1];
1118 struct rhlist_head *tmp, *list;
1119 struct nft_chain *chain;
1122 return ERR_PTR(-EINVAL);
1124 nla_strlcpy(search, nla, sizeof(search));
1126 WARN_ON(!rcu_read_lock_held() &&
1127 !lockdep_commit_lock_is_held(net));
1129 chain = ERR_PTR(-ENOENT);
1131 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1135 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1136 if (nft_active_genmask(chain, genmask))
1139 chain = ERR_PTR(-ENOENT);
1145 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1146 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1147 .len = NFT_TABLE_MAXNAMELEN - 1 },
1148 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1149 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1150 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1151 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1152 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1153 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1154 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1155 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1158 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1159 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1160 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1161 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1162 .len = IFNAMSIZ - 1 },
1165 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1167 struct nft_stats *cpu_stats, total;
1168 struct nlattr *nest;
1176 memset(&total, 0, sizeof(total));
1177 for_each_possible_cpu(cpu) {
1178 cpu_stats = per_cpu_ptr(stats, cpu);
1180 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1181 pkts = cpu_stats->pkts;
1182 bytes = cpu_stats->bytes;
1183 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1185 total.bytes += bytes;
1187 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
1189 goto nla_put_failure;
1191 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1192 NFTA_COUNTER_PAD) ||
1193 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1195 goto nla_put_failure;
1197 nla_nest_end(skb, nest);
1204 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1205 u32 portid, u32 seq, int event, u32 flags,
1206 int family, const struct nft_table *table,
1207 const struct nft_chain *chain)
1209 struct nlmsghdr *nlh;
1210 struct nfgenmsg *nfmsg;
1212 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1213 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1215 goto nla_put_failure;
1217 nfmsg = nlmsg_data(nlh);
1218 nfmsg->nfgen_family = family;
1219 nfmsg->version = NFNETLINK_V0;
1220 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1222 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1223 goto nla_put_failure;
1224 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1226 goto nla_put_failure;
1227 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1228 goto nla_put_failure;
1230 if (nft_is_base_chain(chain)) {
1231 const struct nft_base_chain *basechain = nft_base_chain(chain);
1232 const struct nf_hook_ops *ops = &basechain->ops;
1233 struct nft_stats __percpu *stats;
1234 struct nlattr *nest;
1236 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
1238 goto nla_put_failure;
1239 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1240 goto nla_put_failure;
1241 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1242 goto nla_put_failure;
1243 if (basechain->dev_name[0] &&
1244 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1245 goto nla_put_failure;
1246 nla_nest_end(skb, nest);
1248 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1249 htonl(basechain->policy)))
1250 goto nla_put_failure;
1252 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1253 goto nla_put_failure;
1255 stats = rcu_dereference_check(basechain->stats,
1256 lockdep_commit_lock_is_held(net));
1257 if (nft_dump_stats(skb, stats))
1258 goto nla_put_failure;
1261 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1262 goto nla_put_failure;
1264 nlmsg_end(skb, nlh);
1268 nlmsg_trim(skb, nlh);
1272 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1274 struct sk_buff *skb;
1278 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1281 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1285 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1286 event, 0, ctx->family, ctx->table,
1293 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1294 ctx->report, GFP_KERNEL);
1297 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1300 static int nf_tables_dump_chains(struct sk_buff *skb,
1301 struct netlink_callback *cb)
1303 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1304 const struct nft_table *table;
1305 const struct nft_chain *chain;
1306 unsigned int idx = 0, s_idx = cb->args[0];
1307 struct net *net = sock_net(skb->sk);
1308 int family = nfmsg->nfgen_family;
1311 cb->seq = net->nft.base_seq;
1313 list_for_each_entry_rcu(table, &net->nft.tables, list) {
1314 if (family != NFPROTO_UNSPEC && family != table->family)
1317 list_for_each_entry_rcu(chain, &table->chains, list) {
1321 memset(&cb->args[1], 0,
1322 sizeof(cb->args) - sizeof(cb->args[0]));
1323 if (!nft_is_active(net, chain))
1325 if (nf_tables_fill_chain_info(skb, net,
1326 NETLINK_CB(cb->skb).portid,
1330 table->family, table,
1334 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1345 /* called with rcu_read_lock held */
1346 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1347 struct sk_buff *skb, const struct nlmsghdr *nlh,
1348 const struct nlattr * const nla[],
1349 struct netlink_ext_ack *extack)
1351 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1352 u8 genmask = nft_genmask_cur(net);
1353 const struct nft_chain *chain;
1354 struct nft_table *table;
1355 struct sk_buff *skb2;
1356 int family = nfmsg->nfgen_family;
1359 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1360 struct netlink_dump_control c = {
1361 .dump = nf_tables_dump_chains,
1362 .module = THIS_MODULE,
1365 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1368 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1369 if (IS_ERR(table)) {
1370 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1371 return PTR_ERR(table);
1374 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1375 if (IS_ERR(chain)) {
1376 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1377 return PTR_ERR(chain);
1380 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1384 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1385 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1386 family, table, chain);
1388 goto err_fill_chain_info;
1390 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1392 err_fill_chain_info:
1397 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1398 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1399 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1402 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1404 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1405 struct nft_stats __percpu *newstats;
1406 struct nft_stats *stats;
1409 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy,
1412 return ERR_PTR(err);
1414 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1415 return ERR_PTR(-EINVAL);
1417 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1418 if (newstats == NULL)
1419 return ERR_PTR(-ENOMEM);
1421 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1422 * are not exposed to userspace.
1425 stats = this_cpu_ptr(newstats);
1426 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1427 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1433 static void nft_chain_stats_replace(struct net *net,
1434 struct nft_base_chain *chain,
1435 struct nft_stats __percpu *newstats)
1437 struct nft_stats __percpu *oldstats;
1439 if (newstats == NULL)
1442 if (rcu_access_pointer(chain->stats)) {
1443 oldstats = rcu_dereference_protected(chain->stats,
1444 lockdep_commit_lock_is_held(net));
1445 rcu_assign_pointer(chain->stats, newstats);
1447 free_percpu(oldstats);
1449 rcu_assign_pointer(chain->stats, newstats);
1450 static_branch_inc(&nft_counters_enabled);
1454 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1456 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1457 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1463 /* should be NULL either via abort or via successful commit */
1464 WARN_ON_ONCE(chain->rules_next);
1465 kvfree(chain->rules_next);
1468 static void nf_tables_chain_destroy(struct nft_ctx *ctx)
1470 struct nft_chain *chain = ctx->chain;
1472 if (WARN_ON(chain->use > 0))
1475 /* no concurrent access possible anymore */
1476 nf_tables_chain_free_chain_rules(chain);
1478 if (nft_is_base_chain(chain)) {
1479 struct nft_base_chain *basechain = nft_base_chain(chain);
1481 module_put(basechain->type->owner);
1482 if (rcu_access_pointer(basechain->stats)) {
1483 static_branch_dec(&nft_counters_enabled);
1484 free_percpu(rcu_dereference_raw(basechain->stats));
1494 struct nft_chain_hook {
1497 const struct nft_chain_type *type;
1498 struct net_device *dev;
1501 static int nft_chain_parse_hook(struct net *net,
1502 const struct nlattr * const nla[],
1503 struct nft_chain_hook *hook, u8 family,
1506 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1507 const struct nft_chain_type *type;
1508 struct net_device *dev;
1511 lockdep_assert_held(&net->nft.commit_mutex);
1512 lockdep_nfnl_nft_mutex_not_held();
1514 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1515 nft_hook_policy, NULL);
1519 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1520 ha[NFTA_HOOK_PRIORITY] == NULL)
1523 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1524 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1526 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1530 if (nla[NFTA_CHAIN_TYPE]) {
1531 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1534 return PTR_ERR(type);
1536 if (hook->num > NF_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1539 if (type->type == NFT_CHAIN_T_NAT &&
1540 hook->priority <= NF_IP_PRI_CONNTRACK)
1543 if (!try_module_get(type->owner))
1549 if (family == NFPROTO_NETDEV) {
1550 char ifname[IFNAMSIZ];
1552 if (!ha[NFTA_HOOK_DEV]) {
1553 module_put(type->owner);
1557 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1558 dev = __dev_get_by_name(net, ifname);
1560 module_put(type->owner);
1564 } else if (ha[NFTA_HOOK_DEV]) {
1565 module_put(type->owner);
1572 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1574 module_put(hook->type->owner);
1577 struct nft_rules_old {
1579 struct nft_rule **start;
1582 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1585 if (alloc > INT_MAX)
1588 alloc += 1; /* NULL, ends rules */
1589 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1592 alloc *= sizeof(struct nft_rule *);
1593 alloc += sizeof(struct nft_rules_old);
1595 return kvmalloc(alloc, GFP_KERNEL);
1598 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1601 const struct nlattr * const *nla = ctx->nla;
1602 struct nft_table *table = ctx->table;
1603 struct nft_base_chain *basechain;
1604 struct nft_stats __percpu *stats;
1605 struct net *net = ctx->net;
1606 struct nft_chain *chain;
1607 struct nft_rule **rules;
1610 if (table->use == UINT_MAX)
1613 if (nla[NFTA_CHAIN_HOOK]) {
1614 struct nft_chain_hook hook;
1615 struct nf_hook_ops *ops;
1617 err = nft_chain_parse_hook(net, nla, &hook, family, true);
1621 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1622 if (basechain == NULL) {
1623 nft_chain_release_hook(&hook);
1627 if (hook.dev != NULL)
1628 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1630 if (nla[NFTA_CHAIN_COUNTERS]) {
1631 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1632 if (IS_ERR(stats)) {
1633 nft_chain_release_hook(&hook);
1635 return PTR_ERR(stats);
1637 rcu_assign_pointer(basechain->stats, stats);
1638 static_branch_inc(&nft_counters_enabled);
1641 basechain->type = hook.type;
1642 chain = &basechain->chain;
1644 ops = &basechain->ops;
1646 ops->hooknum = hook.num;
1647 ops->priority = hook.priority;
1649 ops->hook = hook.type->hooks[ops->hooknum];
1650 ops->dev = hook.dev;
1652 chain->flags |= NFT_BASE_CHAIN;
1653 basechain->policy = policy;
1655 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1661 INIT_LIST_HEAD(&chain->rules);
1662 chain->handle = nf_tables_alloc_handle(table);
1663 chain->table = table;
1664 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1670 rules = nf_tables_chain_alloc_rules(chain, 0);
1677 rcu_assign_pointer(chain->rules_gen_0, rules);
1678 rcu_assign_pointer(chain->rules_gen_1, rules);
1680 err = nf_tables_register_hook(net, table, chain);
1684 err = rhltable_insert_key(&table->chains_ht, chain->name,
1685 &chain->rhlhead, nft_chain_ht_params);
1689 err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1691 rhltable_remove(&table->chains_ht, &chain->rhlhead,
1692 nft_chain_ht_params);
1697 list_add_tail_rcu(&chain->list, &table->chains);
1701 nf_tables_unregister_hook(net, table, chain);
1703 nf_tables_chain_destroy(ctx);
1708 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy)
1710 const struct nlattr * const *nla = ctx->nla;
1711 struct nft_table *table = ctx->table;
1712 struct nft_chain *chain = ctx->chain;
1713 struct nft_base_chain *basechain;
1714 struct nft_stats *stats = NULL;
1715 struct nft_chain_hook hook;
1716 struct nf_hook_ops *ops;
1717 struct nft_trans *trans;
1720 if (nla[NFTA_CHAIN_HOOK]) {
1721 if (!nft_is_base_chain(chain))
1724 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
1729 basechain = nft_base_chain(chain);
1730 if (basechain->type != hook.type) {
1731 nft_chain_release_hook(&hook);
1735 ops = &basechain->ops;
1736 if (ops->hooknum != hook.num ||
1737 ops->priority != hook.priority ||
1738 ops->dev != hook.dev) {
1739 nft_chain_release_hook(&hook);
1742 nft_chain_release_hook(&hook);
1745 if (nla[NFTA_CHAIN_HANDLE] &&
1746 nla[NFTA_CHAIN_NAME]) {
1747 struct nft_chain *chain2;
1749 chain2 = nft_chain_lookup(ctx->net, table,
1750 nla[NFTA_CHAIN_NAME], genmask);
1751 if (!IS_ERR(chain2))
1755 if (nla[NFTA_CHAIN_COUNTERS]) {
1756 if (!nft_is_base_chain(chain))
1759 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1761 return PTR_ERR(stats);
1765 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
1766 sizeof(struct nft_trans_chain));
1770 nft_trans_chain_stats(trans) = stats;
1771 nft_trans_chain_update(trans) = true;
1773 if (nla[NFTA_CHAIN_POLICY])
1774 nft_trans_chain_policy(trans) = policy;
1776 nft_trans_chain_policy(trans) = -1;
1778 if (nla[NFTA_CHAIN_HANDLE] &&
1779 nla[NFTA_CHAIN_NAME]) {
1780 struct nft_trans *tmp;
1784 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1789 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
1790 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
1791 tmp->ctx.table == table &&
1792 nft_trans_chain_update(tmp) &&
1793 nft_trans_chain_name(tmp) &&
1794 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
1800 nft_trans_chain_name(trans) = name;
1802 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1811 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1812 struct sk_buff *skb, const struct nlmsghdr *nlh,
1813 const struct nlattr * const nla[],
1814 struct netlink_ext_ack *extack)
1816 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1817 u8 genmask = nft_genmask_next(net);
1818 int family = nfmsg->nfgen_family;
1819 const struct nlattr *attr;
1820 struct nft_table *table;
1821 struct nft_chain *chain;
1822 u8 policy = NF_ACCEPT;
1826 lockdep_assert_held(&net->nft.commit_mutex);
1828 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1829 if (IS_ERR(table)) {
1830 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1831 return PTR_ERR(table);
1835 attr = nla[NFTA_CHAIN_NAME];
1837 if (nla[NFTA_CHAIN_HANDLE]) {
1838 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1839 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1840 if (IS_ERR(chain)) {
1841 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
1842 return PTR_ERR(chain);
1844 attr = nla[NFTA_CHAIN_HANDLE];
1846 chain = nft_chain_lookup(net, table, attr, genmask);
1847 if (IS_ERR(chain)) {
1848 if (PTR_ERR(chain) != -ENOENT) {
1849 NL_SET_BAD_ATTR(extack, attr);
1850 return PTR_ERR(chain);
1856 if (nla[NFTA_CHAIN_POLICY]) {
1857 if (chain != NULL &&
1858 !nft_is_base_chain(chain)) {
1859 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1863 if (chain == NULL &&
1864 nla[NFTA_CHAIN_HOOK] == NULL) {
1865 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1869 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1879 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1881 if (chain != NULL) {
1882 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1883 NL_SET_BAD_ATTR(extack, attr);
1886 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1889 return nf_tables_updchain(&ctx, genmask, policy);
1892 return nf_tables_addchain(&ctx, family, genmask, policy);
1895 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1896 struct sk_buff *skb, const struct nlmsghdr *nlh,
1897 const struct nlattr * const nla[],
1898 struct netlink_ext_ack *extack)
1900 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1901 u8 genmask = nft_genmask_next(net);
1902 int family = nfmsg->nfgen_family;
1903 const struct nlattr *attr;
1904 struct nft_table *table;
1905 struct nft_chain *chain;
1906 struct nft_rule *rule;
1912 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1913 if (IS_ERR(table)) {
1914 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1915 return PTR_ERR(table);
1918 if (nla[NFTA_CHAIN_HANDLE]) {
1919 attr = nla[NFTA_CHAIN_HANDLE];
1920 handle = be64_to_cpu(nla_get_be64(attr));
1921 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1923 attr = nla[NFTA_CHAIN_NAME];
1924 chain = nft_chain_lookup(net, table, attr, genmask);
1926 if (IS_ERR(chain)) {
1927 NL_SET_BAD_ATTR(extack, attr);
1928 return PTR_ERR(chain);
1931 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1935 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1938 list_for_each_entry(rule, &chain->rules, list) {
1939 if (!nft_is_active_next(net, rule))
1943 err = nft_delrule(&ctx, rule);
1948 /* There are rules and elements that are still holding references to us,
1949 * we cannot do a recursive removal in this case.
1952 NL_SET_BAD_ATTR(extack, attr);
1956 return nft_delchain(&ctx);
1964 * nft_register_expr - register nf_tables expr type
1967 * Registers the expr type for use with nf_tables. Returns zero on
1968 * success or a negative errno code otherwise.
1970 int nft_register_expr(struct nft_expr_type *type)
1972 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1973 if (type->family == NFPROTO_UNSPEC)
1974 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1976 list_add_rcu(&type->list, &nf_tables_expressions);
1977 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1980 EXPORT_SYMBOL_GPL(nft_register_expr);
1983 * nft_unregister_expr - unregister nf_tables expr type
1986 * Unregisters the expr typefor use with nf_tables.
1988 void nft_unregister_expr(struct nft_expr_type *type)
1990 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1991 list_del_rcu(&type->list);
1992 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1994 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1996 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1999 const struct nft_expr_type *type;
2001 list_for_each_entry(type, &nf_tables_expressions, list) {
2002 if (!nla_strcmp(nla, type->name) &&
2003 (!type->family || type->family == family))
2009 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2013 const struct nft_expr_type *type;
2016 return ERR_PTR(-EINVAL);
2018 type = __nft_expr_type_get(family, nla);
2019 if (type != NULL && try_module_get(type->owner))
2022 lockdep_nfnl_nft_mutex_not_held();
2023 #ifdef CONFIG_MODULES
2025 nft_request_module(net, "nft-expr-%u-%.*s", family,
2026 nla_len(nla), (char *)nla_data(nla));
2027 if (__nft_expr_type_get(family, nla))
2028 return ERR_PTR(-EAGAIN);
2030 nft_request_module(net, "nft-expr-%.*s",
2031 nla_len(nla), (char *)nla_data(nla));
2032 if (__nft_expr_type_get(family, nla))
2033 return ERR_PTR(-EAGAIN);
2036 return ERR_PTR(-ENOENT);
2039 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2040 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2041 .len = NFT_MODULE_AUTOLOAD_LIMIT },
2042 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2045 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2046 const struct nft_expr *expr)
2048 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2049 goto nla_put_failure;
2051 if (expr->ops->dump) {
2052 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
2054 goto nla_put_failure;
2055 if (expr->ops->dump(skb, expr) < 0)
2056 goto nla_put_failure;
2057 nla_nest_end(skb, data);
2066 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2067 const struct nft_expr *expr)
2069 struct nlattr *nest;
2071 nest = nla_nest_start(skb, attr);
2073 goto nla_put_failure;
2074 if (nf_tables_fill_expr_info(skb, expr) < 0)
2075 goto nla_put_failure;
2076 nla_nest_end(skb, nest);
2083 struct nft_expr_info {
2084 const struct nft_expr_ops *ops;
2085 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2088 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2089 const struct nlattr *nla,
2090 struct nft_expr_info *info)
2092 const struct nft_expr_type *type;
2093 const struct nft_expr_ops *ops;
2094 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2097 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL);
2101 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2103 return PTR_ERR(type);
2105 if (tb[NFTA_EXPR_DATA]) {
2106 err = nla_parse_nested(info->tb, type->maxattr,
2107 tb[NFTA_EXPR_DATA], type->policy, NULL);
2111 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2113 if (type->select_ops != NULL) {
2114 ops = type->select_ops(ctx,
2115 (const struct nlattr * const *)info->tb);
2127 module_put(type->owner);
2131 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2132 const struct nft_expr_info *info,
2133 struct nft_expr *expr)
2135 const struct nft_expr_ops *ops = info->ops;
2140 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2151 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2152 struct nft_expr *expr)
2154 const struct nft_expr_type *type = expr->ops->type;
2156 if (expr->ops->destroy)
2157 expr->ops->destroy(ctx, expr);
2158 module_put(type->owner);
2161 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2162 const struct nlattr *nla)
2164 struct nft_expr_info info;
2165 struct nft_expr *expr;
2166 struct module *owner;
2169 err = nf_tables_expr_parse(ctx, nla, &info);
2171 goto err_expr_parse;
2174 if (!(info.ops->type->flags & NFT_EXPR_STATEFUL))
2175 goto err_expr_stateful;
2178 expr = kzalloc(info.ops->size, GFP_KERNEL);
2180 goto err_expr_stateful;
2182 err = nf_tables_newexpr(ctx, &info, expr);
2190 owner = info.ops->type->owner;
2191 if (info.ops->type->release_ops)
2192 info.ops->type->release_ops(info.ops);
2196 return ERR_PTR(err);
2199 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2201 nf_tables_expr_destroy(ctx, expr);
2209 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2212 struct nft_rule *rule;
2214 // FIXME: this sucks
2215 list_for_each_entry_rcu(rule, &chain->rules, list) {
2216 if (handle == rule->handle)
2220 return ERR_PTR(-ENOENT);
2223 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2224 const struct nlattr *nla)
2227 return ERR_PTR(-EINVAL);
2229 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2232 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2233 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2234 .len = NFT_TABLE_MAXNAMELEN - 1 },
2235 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2236 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2237 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2238 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2239 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2240 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2241 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2242 .len = NFT_USERDATA_MAXLEN },
2243 [NFTA_RULE_ID] = { .type = NLA_U32 },
2246 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2247 u32 portid, u32 seq, int event,
2248 u32 flags, int family,
2249 const struct nft_table *table,
2250 const struct nft_chain *chain,
2251 const struct nft_rule *rule)
2253 struct nlmsghdr *nlh;
2254 struct nfgenmsg *nfmsg;
2255 const struct nft_expr *expr, *next;
2256 struct nlattr *list;
2257 const struct nft_rule *prule;
2258 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2260 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2262 goto nla_put_failure;
2264 nfmsg = nlmsg_data(nlh);
2265 nfmsg->nfgen_family = family;
2266 nfmsg->version = NFNETLINK_V0;
2267 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
2269 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2270 goto nla_put_failure;
2271 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2272 goto nla_put_failure;
2273 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2275 goto nla_put_failure;
2277 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
2278 prule = list_prev_entry(rule, list);
2279 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2280 cpu_to_be64(prule->handle),
2282 goto nla_put_failure;
2285 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
2287 goto nla_put_failure;
2288 nft_rule_for_each_expr(expr, next, rule) {
2289 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2290 goto nla_put_failure;
2292 nla_nest_end(skb, list);
2295 struct nft_userdata *udata = nft_userdata(rule);
2296 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2298 goto nla_put_failure;
2301 nlmsg_end(skb, nlh);
2305 nlmsg_trim(skb, nlh);
2309 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2310 const struct nft_rule *rule, int event)
2312 struct sk_buff *skb;
2316 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2319 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2323 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2324 event, 0, ctx->family, ctx->table,
2331 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2332 ctx->report, GFP_KERNEL);
2335 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2338 struct nft_rule_dump_ctx {
2343 static int nf_tables_dump_rules(struct sk_buff *skb,
2344 struct netlink_callback *cb)
2346 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2347 const struct nft_rule_dump_ctx *ctx = cb->data;
2348 const struct nft_table *table;
2349 const struct nft_chain *chain;
2350 const struct nft_rule *rule;
2351 unsigned int idx = 0, s_idx = cb->args[0];
2352 struct net *net = sock_net(skb->sk);
2353 int family = nfmsg->nfgen_family;
2356 cb->seq = net->nft.base_seq;
2358 list_for_each_entry_rcu(table, &net->nft.tables, list) {
2359 if (family != NFPROTO_UNSPEC && family != table->family)
2362 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2365 list_for_each_entry_rcu(chain, &table->chains, list) {
2366 if (ctx && ctx->chain &&
2367 strcmp(ctx->chain, chain->name) != 0)
2370 list_for_each_entry_rcu(rule, &chain->rules, list) {
2371 if (!nft_is_active(net, rule))
2376 memset(&cb->args[1], 0,
2377 sizeof(cb->args) - sizeof(cb->args[0]));
2378 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2381 NLM_F_MULTI | NLM_F_APPEND,
2383 table, chain, rule) < 0)
2386 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2399 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2401 const struct nlattr * const *nla = cb->data;
2402 struct nft_rule_dump_ctx *ctx = NULL;
2404 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2405 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2409 if (nla[NFTA_RULE_TABLE]) {
2410 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2417 if (nla[NFTA_RULE_CHAIN]) {
2418 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2432 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2434 struct nft_rule_dump_ctx *ctx = cb->data;
2444 /* called with rcu_read_lock held */
2445 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2446 struct sk_buff *skb, const struct nlmsghdr *nlh,
2447 const struct nlattr * const nla[],
2448 struct netlink_ext_ack *extack)
2450 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2451 u8 genmask = nft_genmask_cur(net);
2452 const struct nft_chain *chain;
2453 const struct nft_rule *rule;
2454 struct nft_table *table;
2455 struct sk_buff *skb2;
2456 int family = nfmsg->nfgen_family;
2459 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2460 struct netlink_dump_control c = {
2461 .start= nf_tables_dump_rules_start,
2462 .dump = nf_tables_dump_rules,
2463 .done = nf_tables_dump_rules_done,
2464 .module = THIS_MODULE,
2465 .data = (void *)nla,
2468 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
2471 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2472 if (IS_ERR(table)) {
2473 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2474 return PTR_ERR(table);
2477 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2478 if (IS_ERR(chain)) {
2479 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2480 return PTR_ERR(chain);
2483 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2485 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2486 return PTR_ERR(rule);
2489 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
2493 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2494 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2495 family, table, chain, rule);
2497 goto err_fill_rule_info;
2499 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
2506 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2507 struct nft_rule *rule)
2509 struct nft_expr *expr, *next;
2511 lockdep_assert_held(&ctx->net->nft.commit_mutex);
2513 * Careful: some expressions might not be initialized in case this
2514 * is called on error from nf_tables_newrule().
2516 expr = nft_expr_first(rule);
2517 while (expr != nft_expr_last(rule) && expr->ops) {
2518 next = nft_expr_next(expr);
2519 nf_tables_expr_destroy(ctx, expr);
2525 static void nf_tables_rule_release(const struct nft_ctx *ctx,
2526 struct nft_rule *rule)
2528 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
2529 nf_tables_rule_destroy(ctx, rule);
2532 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
2534 struct nft_expr *expr, *last;
2535 const struct nft_data *data;
2536 struct nft_rule *rule;
2539 if (ctx->level == NFT_JUMP_STACK_SIZE)
2542 list_for_each_entry(rule, &chain->rules, list) {
2543 if (!nft_is_active_next(ctx->net, rule))
2546 nft_rule_for_each_expr(expr, last, rule) {
2547 if (!expr->ops->validate)
2550 err = expr->ops->validate(ctx, expr, &data);
2558 EXPORT_SYMBOL_GPL(nft_chain_validate);
2560 static int nft_table_validate(struct net *net, const struct nft_table *table)
2562 struct nft_chain *chain;
2563 struct nft_ctx ctx = {
2565 .family = table->family,
2569 list_for_each_entry(chain, &table->chains, list) {
2570 if (!nft_is_base_chain(chain))
2574 err = nft_chain_validate(&ctx, chain);
2582 #define NFT_RULE_MAXEXPRS 128
2584 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2585 struct sk_buff *skb, const struct nlmsghdr *nlh,
2586 const struct nlattr * const nla[],
2587 struct netlink_ext_ack *extack)
2589 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2590 u8 genmask = nft_genmask_next(net);
2591 struct nft_expr_info *info = NULL;
2592 int family = nfmsg->nfgen_family;
2593 struct nft_table *table;
2594 struct nft_chain *chain;
2595 struct nft_rule *rule, *old_rule = NULL;
2596 struct nft_userdata *udata;
2597 struct nft_trans *trans = NULL;
2598 struct nft_expr *expr;
2601 unsigned int size, i, n, ulen = 0, usize = 0;
2603 u64 handle, pos_handle;
2605 lockdep_assert_held(&net->nft.commit_mutex);
2607 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2608 if (IS_ERR(table)) {
2609 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2610 return PTR_ERR(table);
2613 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2614 if (IS_ERR(chain)) {
2615 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2616 return PTR_ERR(chain);
2619 if (nla[NFTA_RULE_HANDLE]) {
2620 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2621 rule = __nft_rule_lookup(chain, handle);
2623 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2624 return PTR_ERR(rule);
2627 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2628 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2631 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2636 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
2637 nlh->nlmsg_flags & NLM_F_REPLACE)
2639 handle = nf_tables_alloc_handle(table);
2641 if (chain->use == UINT_MAX)
2644 if (nla[NFTA_RULE_POSITION]) {
2645 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2646 old_rule = __nft_rule_lookup(chain, pos_handle);
2647 if (IS_ERR(old_rule)) {
2648 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
2649 return PTR_ERR(old_rule);
2654 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2658 if (nla[NFTA_RULE_EXPRESSIONS]) {
2659 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
2660 sizeof(struct nft_expr_info),
2665 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2667 if (nla_type(tmp) != NFTA_LIST_ELEM)
2669 if (n == NFT_RULE_MAXEXPRS)
2671 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2674 size += info[n].ops->size;
2678 /* Check for overflow of dlen field */
2680 if (size >= 1 << 12)
2683 if (nla[NFTA_RULE_USERDATA]) {
2684 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2686 usize = sizeof(struct nft_userdata) + ulen;
2690 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2694 nft_activate_next(net, rule);
2696 rule->handle = handle;
2698 rule->udata = ulen ? 1 : 0;
2701 udata = nft_userdata(rule);
2702 udata->len = ulen - 1;
2703 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2706 expr = nft_expr_first(rule);
2707 for (i = 0; i < n; i++) {
2708 err = nf_tables_newexpr(&ctx, &info[i], expr);
2712 if (info[i].ops->validate)
2713 nft_validate_state_update(net, NFT_VALIDATE_NEED);
2716 expr = nft_expr_next(expr);
2719 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2720 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
2721 if (trans == NULL) {
2725 err = nft_delrule(&ctx, old_rule);
2727 nft_trans_destroy(trans);
2731 list_add_tail_rcu(&rule->list, &old_rule->list);
2733 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2738 if (nlh->nlmsg_flags & NLM_F_APPEND) {
2740 list_add_rcu(&rule->list, &old_rule->list);
2742 list_add_tail_rcu(&rule->list, &chain->rules);
2745 list_add_tail_rcu(&rule->list, &old_rule->list);
2747 list_add_rcu(&rule->list, &chain->rules);
2753 if (net->nft.validate_state == NFT_VALIDATE_DO)
2754 return nft_table_validate(net, table);
2758 nf_tables_rule_release(&ctx, rule);
2760 for (i = 0; i < n; i++) {
2762 module_put(info[i].ops->type->owner);
2763 if (info[i].ops->type->release_ops)
2764 info[i].ops->type->release_ops(info[i].ops);
2771 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2772 const struct nlattr *nla)
2774 u32 id = ntohl(nla_get_be32(nla));
2775 struct nft_trans *trans;
2777 list_for_each_entry(trans, &net->nft.commit_list, list) {
2778 struct nft_rule *rule = nft_trans_rule(trans);
2780 if (trans->msg_type == NFT_MSG_NEWRULE &&
2781 id == nft_trans_rule_id(trans))
2784 return ERR_PTR(-ENOENT);
2787 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2788 struct sk_buff *skb, const struct nlmsghdr *nlh,
2789 const struct nlattr * const nla[],
2790 struct netlink_ext_ack *extack)
2792 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2793 u8 genmask = nft_genmask_next(net);
2794 struct nft_table *table;
2795 struct nft_chain *chain = NULL;
2796 struct nft_rule *rule;
2797 int family = nfmsg->nfgen_family, err = 0;
2800 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2801 if (IS_ERR(table)) {
2802 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2803 return PTR_ERR(table);
2806 if (nla[NFTA_RULE_CHAIN]) {
2807 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
2809 if (IS_ERR(chain)) {
2810 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2811 return PTR_ERR(chain);
2815 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2818 if (nla[NFTA_RULE_HANDLE]) {
2819 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2821 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2822 return PTR_ERR(rule);
2825 err = nft_delrule(&ctx, rule);
2826 } else if (nla[NFTA_RULE_ID]) {
2827 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2829 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
2830 return PTR_ERR(rule);
2833 err = nft_delrule(&ctx, rule);
2835 err = nft_delrule_by_chain(&ctx);
2838 list_for_each_entry(chain, &table->chains, list) {
2839 if (!nft_is_active_next(net, chain))
2843 err = nft_delrule_by_chain(&ctx);
2856 static LIST_HEAD(nf_tables_set_types);
2858 int nft_register_set(struct nft_set_type *type)
2860 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2861 list_add_tail_rcu(&type->list, &nf_tables_set_types);
2862 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2865 EXPORT_SYMBOL_GPL(nft_register_set);
2867 void nft_unregister_set(struct nft_set_type *type)
2869 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2870 list_del_rcu(&type->list);
2871 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2873 EXPORT_SYMBOL_GPL(nft_unregister_set);
2875 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
2876 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
2879 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
2881 return (flags & type->features) == (flags & NFT_SET_FEATURES);
2885 * Select a set implementation based on the data characteristics and the
2886 * given policy. The total memory use might not be known if no size is
2887 * given, in that case the amount of memory per element is used.
2889 static const struct nft_set_ops *
2890 nft_select_set_ops(const struct nft_ctx *ctx,
2891 const struct nlattr * const nla[],
2892 const struct nft_set_desc *desc,
2893 enum nft_set_policies policy)
2895 const struct nft_set_ops *ops, *bops;
2896 struct nft_set_estimate est, best;
2897 const struct nft_set_type *type;
2900 lockdep_assert_held(&ctx->net->nft.commit_mutex);
2901 lockdep_nfnl_nft_mutex_not_held();
2902 #ifdef CONFIG_MODULES
2903 if (list_empty(&nf_tables_set_types)) {
2904 nft_request_module(ctx->net, "nft-set");
2905 if (!list_empty(&nf_tables_set_types))
2906 return ERR_PTR(-EAGAIN);
2909 if (nla[NFTA_SET_FLAGS] != NULL)
2910 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2917 list_for_each_entry(type, &nf_tables_set_types, list) {
2920 if (!nft_set_ops_candidate(type, flags))
2922 if (!ops->estimate(desc, flags, &est))
2926 case NFT_SET_POL_PERFORMANCE:
2927 if (est.lookup < best.lookup)
2929 if (est.lookup == best.lookup &&
2930 est.space < best.space)
2933 case NFT_SET_POL_MEMORY:
2935 if (est.space < best.space)
2937 if (est.space == best.space &&
2938 est.lookup < best.lookup)
2940 } else if (est.size < best.size || !bops) {
2948 if (!try_module_get(type->owner))
2951 module_put(to_set_type(bops)->owner);
2960 return ERR_PTR(-EOPNOTSUPP);
2963 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2964 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2965 .len = NFT_TABLE_MAXNAMELEN - 1 },
2966 [NFTA_SET_NAME] = { .type = NLA_STRING,
2967 .len = NFT_SET_MAXNAMELEN - 1 },
2968 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2969 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2970 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2971 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2972 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2973 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2974 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2975 [NFTA_SET_ID] = { .type = NLA_U32 },
2976 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2977 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2978 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2979 .len = NFT_USERDATA_MAXLEN },
2980 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
2981 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
2984 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2985 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2988 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2989 const struct sk_buff *skb,
2990 const struct nlmsghdr *nlh,
2991 const struct nlattr * const nla[],
2992 struct netlink_ext_ack *extack,
2995 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2996 int family = nfmsg->nfgen_family;
2997 struct nft_table *table = NULL;
2999 if (nla[NFTA_SET_TABLE] != NULL) {
3000 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3002 if (IS_ERR(table)) {
3003 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3004 return PTR_ERR(table);
3008 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3012 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3013 const struct nlattr *nla, u8 genmask)
3015 struct nft_set *set;
3018 return ERR_PTR(-EINVAL);
3020 list_for_each_entry_rcu(set, &table->sets, list) {
3021 if (!nla_strcmp(nla, set->name) &&
3022 nft_active_genmask(set, genmask))
3025 return ERR_PTR(-ENOENT);
3028 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3029 const struct nlattr *nla,
3032 struct nft_set *set;
3034 list_for_each_entry(set, &table->sets, list) {
3035 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3036 nft_active_genmask(set, genmask))
3039 return ERR_PTR(-ENOENT);
3042 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3043 const struct nft_table *table,
3044 const struct nlattr *nla, u8 genmask)
3046 struct nft_trans *trans;
3047 u32 id = ntohl(nla_get_be32(nla));
3049 list_for_each_entry(trans, &net->nft.commit_list, list) {
3050 if (trans->msg_type == NFT_MSG_NEWSET) {
3051 struct nft_set *set = nft_trans_set(trans);
3053 if (id == nft_trans_set_id(trans) &&
3054 set->table == table &&
3055 nft_active_genmask(set, genmask))
3059 return ERR_PTR(-ENOENT);
3062 struct nft_set *nft_set_lookup_global(const struct net *net,
3063 const struct nft_table *table,
3064 const struct nlattr *nla_set_name,
3065 const struct nlattr *nla_set_id,
3068 struct nft_set *set;
3070 set = nft_set_lookup(table, nla_set_name, genmask);
3075 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
3079 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3081 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3084 const struct nft_set *i;
3086 unsigned long *inuse;
3087 unsigned int n = 0, min = 0;
3089 p = strchr(name, '%');
3091 if (p[1] != 'd' || strchr(p + 2, '%'))
3094 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3098 list_for_each_entry(i, &ctx->table->sets, list) {
3101 if (!nft_is_active_next(ctx->net, i))
3103 if (!sscanf(i->name, name, &tmp))
3105 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3108 set_bit(tmp - min, inuse);
3111 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3112 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3113 min += BITS_PER_BYTE * PAGE_SIZE;
3114 memset(inuse, 0, PAGE_SIZE);
3117 free_page((unsigned long)inuse);
3120 set->name = kasprintf(GFP_KERNEL, name, min + n);
3124 list_for_each_entry(i, &ctx->table->sets, list) {
3125 if (!nft_is_active_next(ctx->net, i))
3127 if (!strcmp(set->name, i->name)) {
3135 static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3137 u64 ms = be64_to_cpu(nla_get_be64(nla));
3138 u64 max = (u64)(~((u64)0));
3140 max = div_u64(max, NSEC_PER_MSEC);
3144 ms *= NSEC_PER_MSEC;
3145 *result = nsecs_to_jiffies64(ms);
3149 static __be64 nf_jiffies64_to_msecs(u64 input)
3151 u64 ms = jiffies64_to_nsecs(input);
3153 return cpu_to_be64(div_u64(ms, NSEC_PER_MSEC));
3156 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3157 const struct nft_set *set, u16 event, u16 flags)
3159 struct nfgenmsg *nfmsg;
3160 struct nlmsghdr *nlh;
3161 struct nlattr *desc;
3162 u32 portid = ctx->portid;
3165 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3166 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3169 goto nla_put_failure;
3171 nfmsg = nlmsg_data(nlh);
3172 nfmsg->nfgen_family = ctx->family;
3173 nfmsg->version = NFNETLINK_V0;
3174 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3176 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3177 goto nla_put_failure;
3178 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3179 goto nla_put_failure;
3180 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3182 goto nla_put_failure;
3183 if (set->flags != 0)
3184 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3185 goto nla_put_failure;
3187 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3188 goto nla_put_failure;
3189 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3190 goto nla_put_failure;
3191 if (set->flags & NFT_SET_MAP) {
3192 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3193 goto nla_put_failure;
3194 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3195 goto nla_put_failure;
3197 if (set->flags & NFT_SET_OBJECT &&
3198 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3199 goto nla_put_failure;
3202 nla_put_be64(skb, NFTA_SET_TIMEOUT,
3203 nf_jiffies64_to_msecs(set->timeout),
3205 goto nla_put_failure;
3207 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3208 goto nla_put_failure;
3210 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3211 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3212 goto nla_put_failure;
3216 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3217 goto nla_put_failure;
3219 desc = nla_nest_start(skb, NFTA_SET_DESC);
3221 goto nla_put_failure;
3223 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3224 goto nla_put_failure;
3225 nla_nest_end(skb, desc);
3227 nlmsg_end(skb, nlh);
3231 nlmsg_trim(skb, nlh);
3235 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3236 const struct nft_set *set, int event,
3239 struct sk_buff *skb;
3240 u32 portid = ctx->portid;
3244 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3247 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3251 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3257 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
3261 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3264 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3266 const struct nft_set *set;
3267 unsigned int idx, s_idx = cb->args[0];
3268 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3269 struct net *net = sock_net(skb->sk);
3270 struct nft_ctx *ctx = cb->data, ctx_set;
3276 cb->seq = net->nft.base_seq;
3278 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3279 if (ctx->family != NFPROTO_UNSPEC &&
3280 ctx->family != table->family)
3283 if (ctx->table && ctx->table != table)
3287 if (cur_table != table)
3293 list_for_each_entry_rcu(set, &table->sets, list) {
3296 if (!nft_is_active(net, set))
3300 ctx_set.table = table;
3301 ctx_set.family = table->family;
3303 if (nf_tables_fill_set(skb, &ctx_set, set,
3307 cb->args[2] = (unsigned long) table;
3310 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3323 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3325 struct nft_ctx *ctx_dump = NULL;
3327 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3328 if (ctx_dump == NULL)
3331 cb->data = ctx_dump;
3335 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3341 /* called with rcu_read_lock held */
3342 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3343 struct sk_buff *skb, const struct nlmsghdr *nlh,
3344 const struct nlattr * const nla[],
3345 struct netlink_ext_ack *extack)
3347 u8 genmask = nft_genmask_cur(net);
3348 const struct nft_set *set;
3350 struct sk_buff *skb2;
3351 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3354 /* Verify existence before starting dump */
3355 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3360 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3361 struct netlink_dump_control c = {
3362 .start = nf_tables_dump_sets_start,
3363 .dump = nf_tables_dump_sets,
3364 .done = nf_tables_dump_sets_done,
3366 .module = THIS_MODULE,
3369 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3372 /* Only accept unspec with dump */
3373 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3374 return -EAFNOSUPPORT;
3375 if (!nla[NFTA_SET_TABLE])
3378 set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3380 return PTR_ERR(set);
3382 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3386 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3388 goto err_fill_set_info;
3390 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3397 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
3398 struct nft_set_desc *desc,
3399 const struct nlattr *nla)
3401 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
3404 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
3405 nft_set_desc_policy, NULL);
3409 if (da[NFTA_SET_DESC_SIZE] != NULL)
3410 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
3415 static int nf_tables_newset(struct net *net, struct sock *nlsk,
3416 struct sk_buff *skb, const struct nlmsghdr *nlh,
3417 const struct nlattr * const nla[],
3418 struct netlink_ext_ack *extack)
3420 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3421 u8 genmask = nft_genmask_next(net);
3422 int family = nfmsg->nfgen_family;
3423 const struct nft_set_ops *ops;
3424 struct nft_table *table;
3425 struct nft_set *set;
3430 u32 ktype, dtype, flags, policy, gc_int, objtype;
3431 struct nft_set_desc desc;
3432 unsigned char *udata;
3436 if (nla[NFTA_SET_TABLE] == NULL ||
3437 nla[NFTA_SET_NAME] == NULL ||
3438 nla[NFTA_SET_KEY_LEN] == NULL ||
3439 nla[NFTA_SET_ID] == NULL)
3442 memset(&desc, 0, sizeof(desc));
3444 ktype = NFT_DATA_VALUE;
3445 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3446 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3447 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3451 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
3452 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
3456 if (nla[NFTA_SET_FLAGS] != NULL) {
3457 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3458 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
3459 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
3460 NFT_SET_MAP | NFT_SET_EVAL |
3463 /* Only one of these operations is supported */
3464 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
3465 (NFT_SET_MAP | NFT_SET_OBJECT))
3467 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3468 (NFT_SET_EVAL | NFT_SET_OBJECT))
3473 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3474 if (!(flags & NFT_SET_MAP))
3477 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3478 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3479 dtype != NFT_DATA_VERDICT)
3482 if (dtype != NFT_DATA_VERDICT) {
3483 if (nla[NFTA_SET_DATA_LEN] == NULL)
3485 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
3486 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
3489 desc.dlen = sizeof(struct nft_verdict);
3490 } else if (flags & NFT_SET_MAP)
3493 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3494 if (!(flags & NFT_SET_OBJECT))
3497 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3498 if (objtype == NFT_OBJECT_UNSPEC ||
3499 objtype > NFT_OBJECT_MAX)
3501 } else if (flags & NFT_SET_OBJECT)
3504 objtype = NFT_OBJECT_UNSPEC;
3507 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3508 if (!(flags & NFT_SET_TIMEOUT))
3511 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
3516 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3517 if (!(flags & NFT_SET_TIMEOUT))
3519 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3522 policy = NFT_SET_POL_PERFORMANCE;
3523 if (nla[NFTA_SET_POLICY] != NULL)
3524 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3526 if (nla[NFTA_SET_DESC] != NULL) {
3527 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
3532 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
3533 if (IS_ERR(table)) {
3534 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3535 return PTR_ERR(table);
3538 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
3540 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
3542 if (PTR_ERR(set) != -ENOENT) {
3543 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3544 return PTR_ERR(set);
3547 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3548 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3551 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3557 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3560 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
3562 return PTR_ERR(ops);
3565 if (nla[NFTA_SET_USERDATA])
3566 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3569 if (ops->privsize != NULL)
3570 size = ops->privsize(nla, &desc);
3572 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3578 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3584 err = nf_tables_set_alloc_name(&ctx, set, name);
3591 udata = set->data + size;
3592 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3595 INIT_LIST_HEAD(&set->bindings);
3597 write_pnet(&set->net, net);
3600 set->klen = desc.klen;
3602 set->objtype = objtype;
3603 set->dlen = desc.dlen;
3605 set->size = desc.size;
3606 set->policy = policy;
3609 set->timeout = timeout;
3610 set->gc_int = gc_int;
3611 set->handle = nf_tables_alloc_handle(table);
3613 err = ops->init(set, &desc, nla);
3617 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3621 list_add_tail_rcu(&set->list, &table->sets);
3632 module_put(to_set_type(ops)->owner);
3636 static void nft_set_destroy(struct nft_set *set)
3638 if (WARN_ON(set->use > 0))
3641 set->ops->destroy(set);
3642 module_put(to_set_type(set->ops)->owner);
3647 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3648 struct sk_buff *skb, const struct nlmsghdr *nlh,
3649 const struct nlattr * const nla[],
3650 struct netlink_ext_ack *extack)
3652 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3653 u8 genmask = nft_genmask_next(net);
3654 const struct nlattr *attr;
3655 struct nft_set *set;
3659 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3660 return -EAFNOSUPPORT;
3661 if (nla[NFTA_SET_TABLE] == NULL)
3664 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3669 if (nla[NFTA_SET_HANDLE]) {
3670 attr = nla[NFTA_SET_HANDLE];
3671 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
3673 attr = nla[NFTA_SET_NAME];
3674 set = nft_set_lookup(ctx.table, attr, genmask);
3678 NL_SET_BAD_ATTR(extack, attr);
3679 return PTR_ERR(set);
3682 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
3683 NL_SET_BAD_ATTR(extack, attr);
3687 return nft_delset(&ctx, set);
3690 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3691 struct nft_set *set,
3692 const struct nft_set_iter *iter,
3693 struct nft_set_elem *elem)
3695 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3696 enum nft_registers dreg;
3698 dreg = nft_type_to_reg(set->dtype);
3699 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3700 set->dtype == NFT_DATA_VERDICT ?
3701 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3705 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3706 struct nft_set_binding *binding)
3708 struct nft_set_binding *i;
3709 struct nft_set_iter iter;
3711 if (set->use == UINT_MAX)
3714 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
3717 if (binding->flags & NFT_SET_MAP) {
3718 /* If the set is already bound to the same chain all
3719 * jumps are already validated for that chain.
3721 list_for_each_entry(i, &set->bindings, list) {
3722 if (i->flags & NFT_SET_MAP &&
3723 i->chain == binding->chain)
3727 iter.genmask = nft_genmask_next(ctx->net);
3731 iter.fn = nf_tables_bind_check_setelem;
3733 set->ops->walk(ctx, set, &iter);
3738 binding->chain = ctx->chain;
3739 list_add_tail_rcu(&binding->list, &set->bindings);
3740 nft_set_trans_bind(ctx, set);
3745 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3747 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3748 struct nft_set_binding *binding, bool event)
3750 list_del_rcu(&binding->list);
3752 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
3753 list_del_rcu(&set->list);
3755 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
3759 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3761 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
3762 struct nft_set_binding *binding,
3763 enum nft_trans_phase phase)
3766 case NFT_TRANS_PREPARE:
3769 case NFT_TRANS_ABORT:
3770 case NFT_TRANS_RELEASE:
3774 nf_tables_unbind_set(ctx, set, binding,
3775 phase == NFT_TRANS_COMMIT);
3778 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
3780 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
3782 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
3783 nft_set_destroy(set);
3785 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
3787 const struct nft_set_ext_type nft_set_ext_types[] = {
3788 [NFT_SET_EXT_KEY] = {
3789 .align = __alignof__(u32),
3791 [NFT_SET_EXT_DATA] = {
3792 .align = __alignof__(u32),
3794 [NFT_SET_EXT_EXPR] = {
3795 .align = __alignof__(struct nft_expr),
3797 [NFT_SET_EXT_OBJREF] = {
3798 .len = sizeof(struct nft_object *),
3799 .align = __alignof__(struct nft_object *),
3801 [NFT_SET_EXT_FLAGS] = {
3803 .align = __alignof__(u8),
3805 [NFT_SET_EXT_TIMEOUT] = {
3807 .align = __alignof__(u64),
3809 [NFT_SET_EXT_EXPIRATION] = {
3811 .align = __alignof__(u64),
3813 [NFT_SET_EXT_USERDATA] = {
3814 .len = sizeof(struct nft_userdata),
3815 .align = __alignof__(struct nft_userdata),
3818 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3824 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3825 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3826 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3827 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3828 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3829 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3830 .len = NFT_USERDATA_MAXLEN },
3831 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
3832 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
3833 .len = NFT_OBJ_MAXNAMELEN - 1 },
3836 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3837 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3838 .len = NFT_TABLE_MAXNAMELEN - 1 },
3839 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3840 .len = NFT_SET_MAXNAMELEN - 1 },
3841 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3842 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3845 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3846 const struct sk_buff *skb,
3847 const struct nlmsghdr *nlh,
3848 const struct nlattr * const nla[],
3849 struct netlink_ext_ack *extack,
3852 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3853 int family = nfmsg->nfgen_family;
3854 struct nft_table *table;
3856 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
3858 if (IS_ERR(table)) {
3859 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
3860 return PTR_ERR(table);
3863 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3867 static int nf_tables_fill_setelem(struct sk_buff *skb,
3868 const struct nft_set *set,
3869 const struct nft_set_elem *elem)
3871 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3872 unsigned char *b = skb_tail_pointer(skb);
3873 struct nlattr *nest;
3875 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3877 goto nla_put_failure;
3879 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3880 NFT_DATA_VALUE, set->klen) < 0)
3881 goto nla_put_failure;
3883 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3884 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3885 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3887 goto nla_put_failure;
3889 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3890 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3891 goto nla_put_failure;
3893 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3894 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3895 (*nft_set_ext_obj(ext))->name) < 0)
3896 goto nla_put_failure;
3898 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3899 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3900 htonl(*nft_set_ext_flags(ext))))
3901 goto nla_put_failure;
3903 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3904 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3905 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
3907 goto nla_put_failure;
3909 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3910 u64 expires, now = get_jiffies_64();
3912 expires = *nft_set_ext_expiration(ext);
3913 if (time_before64(now, expires))
3918 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3919 nf_jiffies64_to_msecs(expires),
3921 goto nla_put_failure;
3924 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3925 struct nft_userdata *udata;
3927 udata = nft_set_ext_userdata(ext);
3928 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3929 udata->len + 1, udata->data))
3930 goto nla_put_failure;
3933 nla_nest_end(skb, nest);
3941 struct nft_set_dump_args {
3942 const struct netlink_callback *cb;
3943 struct nft_set_iter iter;
3944 struct sk_buff *skb;
3947 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3948 struct nft_set *set,
3949 const struct nft_set_iter *iter,
3950 struct nft_set_elem *elem)
3952 struct nft_set_dump_args *args;
3954 args = container_of(iter, struct nft_set_dump_args, iter);
3955 return nf_tables_fill_setelem(args->skb, set, elem);
3958 struct nft_set_dump_ctx {
3959 const struct nft_set *set;
3963 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3965 struct nft_set_dump_ctx *dump_ctx = cb->data;
3966 struct net *net = sock_net(skb->sk);
3967 struct nft_table *table;
3968 struct nft_set *set;
3969 struct nft_set_dump_args args;
3970 bool set_found = false;
3971 struct nfgenmsg *nfmsg;
3972 struct nlmsghdr *nlh;
3973 struct nlattr *nest;
3978 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3979 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
3980 dump_ctx->ctx.family != table->family)
3983 if (table != dump_ctx->ctx.table)
3986 list_for_each_entry_rcu(set, &table->sets, list) {
3987 if (set == dump_ctx->set) {
4000 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4001 portid = NETLINK_CB(cb->skb).portid;
4002 seq = cb->nlh->nlmsg_seq;
4004 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4007 goto nla_put_failure;
4009 nfmsg = nlmsg_data(nlh);
4010 nfmsg->nfgen_family = table->family;
4011 nfmsg->version = NFNETLINK_V0;
4012 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4014 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4015 goto nla_put_failure;
4016 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4017 goto nla_put_failure;
4019 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4021 goto nla_put_failure;
4025 args.iter.genmask = nft_genmask_cur(net);
4026 args.iter.skip = cb->args[0];
4027 args.iter.count = 0;
4029 args.iter.fn = nf_tables_dump_setelem;
4030 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4033 nla_nest_end(skb, nest);
4034 nlmsg_end(skb, nlh);
4036 if (args.iter.err && args.iter.err != -EMSGSIZE)
4037 return args.iter.err;
4038 if (args.iter.count == cb->args[0])
4041 cb->args[0] = args.iter.count;
4049 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4051 struct nft_set_dump_ctx *dump_ctx = cb->data;
4053 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4055 return cb->data ? 0 : -ENOMEM;
4058 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4064 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4065 const struct nft_ctx *ctx, u32 seq,
4066 u32 portid, int event, u16 flags,
4067 const struct nft_set *set,
4068 const struct nft_set_elem *elem)
4070 struct nfgenmsg *nfmsg;
4071 struct nlmsghdr *nlh;
4072 struct nlattr *nest;
4075 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4076 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4079 goto nla_put_failure;
4081 nfmsg = nlmsg_data(nlh);
4082 nfmsg->nfgen_family = ctx->family;
4083 nfmsg->version = NFNETLINK_V0;
4084 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
4086 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4087 goto nla_put_failure;
4088 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4089 goto nla_put_failure;
4091 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4093 goto nla_put_failure;
4095 err = nf_tables_fill_setelem(skb, set, elem);
4097 goto nla_put_failure;
4099 nla_nest_end(skb, nest);
4101 nlmsg_end(skb, nlh);
4105 nlmsg_trim(skb, nlh);
4109 static int nft_setelem_parse_flags(const struct nft_set *set,
4110 const struct nlattr *attr, u32 *flags)
4115 *flags = ntohl(nla_get_be32(attr));
4116 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4118 if (!(set->flags & NFT_SET_INTERVAL) &&
4119 *flags & NFT_SET_ELEM_INTERVAL_END)
4125 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4126 const struct nlattr *attr)
4128 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4129 struct nft_data_desc desc;
4130 struct nft_set_elem elem;
4131 struct sk_buff *skb;
4136 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4137 nft_set_elem_policy, NULL);
4141 if (!nla[NFTA_SET_ELEM_KEY])
4144 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4148 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4149 nla[NFTA_SET_ELEM_KEY]);
4154 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
4155 nft_data_release(&elem.key.val, desc.type);
4159 priv = set->ops->get(ctx->net, set, &elem, flags);
4161 return PTR_ERR(priv);
4166 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
4170 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4171 NFT_MSG_NEWSETELEM, 0, set, &elem);
4173 goto err_fill_setelem;
4175 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
4182 /* called with rcu_read_lock held */
4183 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4184 struct sk_buff *skb, const struct nlmsghdr *nlh,
4185 const struct nlattr * const nla[],
4186 struct netlink_ext_ack *extack)
4188 u8 genmask = nft_genmask_cur(net);
4189 struct nft_set *set;
4190 struct nlattr *attr;
4194 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4199 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4201 return PTR_ERR(set);
4203 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4204 struct netlink_dump_control c = {
4205 .start = nf_tables_dump_set_start,
4206 .dump = nf_tables_dump_set,
4207 .done = nf_tables_dump_set_done,
4208 .module = THIS_MODULE,
4210 struct nft_set_dump_ctx dump_ctx = {
4216 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4219 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4222 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4223 err = nft_get_set_elem(&ctx, set, attr);
4231 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4232 const struct nft_set *set,
4233 const struct nft_set_elem *elem,
4234 int event, u16 flags)
4236 struct net *net = ctx->net;
4237 u32 portid = ctx->portid;
4238 struct sk_buff *skb;
4241 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4244 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4248 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
4255 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
4259 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4262 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
4264 struct nft_set *set)
4266 struct nft_trans *trans;
4268 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
4272 nft_trans_elem_set(trans) = set;
4276 void *nft_set_elem_init(const struct nft_set *set,
4277 const struct nft_set_ext_tmpl *tmpl,
4278 const u32 *key, const u32 *data,
4279 u64 timeout, gfp_t gfp)
4281 struct nft_set_ext *ext;
4284 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
4288 ext = nft_set_elem_ext(set, elem);
4289 nft_set_ext_init(ext, tmpl);
4291 memcpy(nft_set_ext_key(ext), key, set->klen);
4292 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4293 memcpy(nft_set_ext_data(ext), data, set->dlen);
4294 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
4295 *nft_set_ext_expiration(ext) =
4296 get_jiffies_64() + timeout;
4297 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
4298 *nft_set_ext_timeout(ext) = timeout;
4303 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
4306 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4307 struct nft_ctx ctx = {
4308 .net = read_pnet(&set->net),
4309 .family = set->table->family,
4312 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
4313 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4314 nft_data_release(nft_set_ext_data(ext), set->dtype);
4315 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) {
4316 struct nft_expr *expr = nft_set_ext_expr(ext);
4318 if (expr->ops->destroy_clone) {
4319 expr->ops->destroy_clone(&ctx, expr);
4320 module_put(expr->ops->type->owner);
4322 nf_tables_expr_destroy(&ctx, expr);
4325 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4326 (*nft_set_ext_obj(ext))->use--;
4329 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
4331 /* Only called from commit path, nft_set_elem_deactivate() already deals with
4332 * the refcounting from the preparation phase.
4334 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
4335 const struct nft_set *set, void *elem)
4337 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4339 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
4340 nf_tables_expr_destroy(ctx, nft_set_ext_expr(ext));
4344 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4345 const struct nlattr *attr, u32 nlmsg_flags)
4347 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4348 u8 genmask = nft_genmask_next(ctx->net);
4349 struct nft_data_desc d1, d2;
4350 struct nft_set_ext_tmpl tmpl;
4351 struct nft_set_ext *ext, *ext2;
4352 struct nft_set_elem elem;
4353 struct nft_set_binding *binding;
4354 struct nft_object *obj = NULL;
4355 struct nft_userdata *udata;
4356 struct nft_data data;
4357 enum nft_registers dreg;
4358 struct nft_trans *trans;
4364 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4365 nft_set_elem_policy, NULL);
4369 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4372 nft_set_ext_prepare(&tmpl);
4374 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4378 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4380 if (set->flags & NFT_SET_MAP) {
4381 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
4382 !(flags & NFT_SET_ELEM_INTERVAL_END))
4385 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4389 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
4390 (nla[NFTA_SET_ELEM_DATA] ||
4391 nla[NFTA_SET_ELEM_OBJREF] ||
4392 nla[NFTA_SET_ELEM_TIMEOUT] ||
4393 nla[NFTA_SET_ELEM_EXPIRATION] ||
4394 nla[NFTA_SET_ELEM_USERDATA] ||
4395 nla[NFTA_SET_ELEM_EXPR]))
4399 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
4400 if (!(set->flags & NFT_SET_TIMEOUT))
4402 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
4406 } else if (set->flags & NFT_SET_TIMEOUT) {
4407 timeout = set->timeout;
4410 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
4411 nla[NFTA_SET_ELEM_KEY]);
4415 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
4418 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
4420 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
4421 if (timeout != set->timeout)
4422 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
4425 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
4426 if (!(set->flags & NFT_SET_OBJECT)) {
4430 obj = nft_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
4431 set->objtype, genmask);
4436 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
4439 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
4440 err = nft_data_init(ctx, &data, sizeof(data), &d2,
4441 nla[NFTA_SET_ELEM_DATA]);
4446 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
4449 dreg = nft_type_to_reg(set->dtype);
4450 list_for_each_entry(binding, &set->bindings, list) {
4451 struct nft_ctx bind_ctx = {
4453 .family = ctx->family,
4454 .table = ctx->table,
4455 .chain = (struct nft_chain *)binding->chain,
4458 if (!(binding->flags & NFT_SET_MAP))
4461 err = nft_validate_register_store(&bind_ctx, dreg,
4467 if (d2.type == NFT_DATA_VERDICT &&
4468 (data.verdict.code == NFT_GOTO ||
4469 data.verdict.code == NFT_JUMP))
4470 nft_validate_state_update(ctx->net,
4474 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
4477 /* The full maximum length of userdata can exceed the maximum
4478 * offset value (U8_MAX) for following extensions, therefor it
4479 * must be the last extension added.
4482 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
4483 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
4485 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
4490 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
4491 timeout, GFP_KERNEL);
4492 if (elem.priv == NULL)
4495 ext = nft_set_elem_ext(set, elem.priv);
4497 *nft_set_ext_flags(ext) = flags;
4499 udata = nft_set_ext_userdata(ext);
4500 udata->len = ulen - 1;
4501 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
4504 *nft_set_ext_obj(ext) = obj;
4508 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
4512 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
4513 err = set->ops->insert(ctx->net, set, &elem, &ext2);
4515 if (err == -EEXIST) {
4516 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
4517 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
4518 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
4519 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
4523 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4524 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
4525 memcmp(nft_set_ext_data(ext),
4526 nft_set_ext_data(ext2), set->dlen) != 0) ||
4527 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4528 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
4529 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
4531 else if (!(nlmsg_flags & NLM_F_EXCL))
4538 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
4543 nft_trans_elem(trans) = elem;
4544 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4548 set->ops->remove(ctx->net, set, &elem);
4556 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4557 nft_data_release(&data, d2.type);
4559 nft_data_release(&elem.key.val, d1.type);
4564 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
4565 struct sk_buff *skb, const struct nlmsghdr *nlh,
4566 const struct nlattr * const nla[],
4567 struct netlink_ext_ack *extack)
4569 u8 genmask = nft_genmask_next(net);
4570 const struct nlattr *attr;
4571 struct nft_set *set;
4575 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
4578 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4583 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4584 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
4586 return PTR_ERR(set);
4588 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4591 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4592 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
4597 if (net->nft.validate_state == NFT_VALIDATE_DO)
4598 return nft_table_validate(net, ctx.table);
4604 * nft_data_hold - hold a nft_data item
4606 * @data: struct nft_data to release
4607 * @type: type of data
4609 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4610 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
4611 * NFT_GOTO verdicts. This function must be called on active data objects
4612 * from the second phase of the commit protocol.
4614 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
4616 if (type == NFT_DATA_VERDICT) {
4617 switch (data->verdict.code) {
4620 data->verdict.chain->use++;
4626 static void nft_set_elem_activate(const struct net *net,
4627 const struct nft_set *set,
4628 struct nft_set_elem *elem)
4630 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4632 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4633 nft_data_hold(nft_set_ext_data(ext), set->dtype);
4634 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4635 (*nft_set_ext_obj(ext))->use++;
4638 static void nft_set_elem_deactivate(const struct net *net,
4639 const struct nft_set *set,
4640 struct nft_set_elem *elem)
4642 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4644 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4645 nft_data_release(nft_set_ext_data(ext), set->dtype);
4646 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4647 (*nft_set_ext_obj(ext))->use--;
4650 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
4651 const struct nlattr *attr)
4653 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4654 struct nft_set_ext_tmpl tmpl;
4655 struct nft_data_desc desc;
4656 struct nft_set_elem elem;
4657 struct nft_set_ext *ext;
4658 struct nft_trans *trans;
4663 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4664 nft_set_elem_policy, NULL);
4669 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4672 nft_set_ext_prepare(&tmpl);
4674 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4678 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4680 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4681 nla[NFTA_SET_ELEM_KEY]);
4686 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4689 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
4692 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
4694 if (elem.priv == NULL)
4697 ext = nft_set_elem_ext(set, elem.priv);
4699 *nft_set_ext_flags(ext) = flags;
4701 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
4702 if (trans == NULL) {
4707 priv = set->ops->deactivate(ctx->net, set, &elem);
4715 nft_set_elem_deactivate(ctx->net, set, &elem);
4717 nft_trans_elem(trans) = elem;
4718 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4726 nft_data_release(&elem.key.val, desc.type);
4731 static int nft_flush_set(const struct nft_ctx *ctx,
4732 struct nft_set *set,
4733 const struct nft_set_iter *iter,
4734 struct nft_set_elem *elem)
4736 struct nft_trans *trans;
4739 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
4740 sizeof(struct nft_trans_elem), GFP_ATOMIC);
4744 if (!set->ops->flush(ctx->net, set, elem->priv)) {
4750 nft_set_elem_deactivate(ctx->net, set, elem);
4751 nft_trans_elem_set(trans) = set;
4752 nft_trans_elem(trans) = *elem;
4753 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4761 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
4762 struct sk_buff *skb, const struct nlmsghdr *nlh,
4763 const struct nlattr * const nla[],
4764 struct netlink_ext_ack *extack)
4766 u8 genmask = nft_genmask_next(net);
4767 const struct nlattr *attr;
4768 struct nft_set *set;
4772 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4777 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4779 return PTR_ERR(set);
4780 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4783 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
4784 struct nft_set_iter iter = {
4786 .fn = nft_flush_set,
4788 set->ops->walk(&ctx, set, &iter);
4793 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4794 err = nft_del_setelem(&ctx, set, attr);
4803 void nft_set_gc_batch_release(struct rcu_head *rcu)
4805 struct nft_set_gc_batch *gcb;
4808 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4809 for (i = 0; i < gcb->head.cnt; i++)
4810 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
4813 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4815 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4818 struct nft_set_gc_batch *gcb;
4820 gcb = kzalloc(sizeof(*gcb), gfp);
4823 gcb->head.set = set;
4826 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4833 * nft_register_obj- register nf_tables stateful object type
4836 * Registers the object type for use with nf_tables. Returns zero on
4837 * success or a negative errno code otherwise.
4839 int nft_register_obj(struct nft_object_type *obj_type)
4841 if (obj_type->type == NFT_OBJECT_UNSPEC)
4844 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4845 list_add_rcu(&obj_type->list, &nf_tables_objects);
4846 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4849 EXPORT_SYMBOL_GPL(nft_register_obj);
4852 * nft_unregister_obj - unregister nf_tables object type
4855 * Unregisters the object type for use with nf_tables.
4857 void nft_unregister_obj(struct nft_object_type *obj_type)
4859 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4860 list_del_rcu(&obj_type->list);
4861 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4863 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4865 struct nft_object *nft_obj_lookup(const struct nft_table *table,
4866 const struct nlattr *nla, u32 objtype,
4869 struct nft_object *obj;
4871 list_for_each_entry_rcu(obj, &table->objects, list) {
4872 if (!nla_strcmp(nla, obj->name) &&
4873 objtype == obj->ops->type->type &&
4874 nft_active_genmask(obj, genmask))
4877 return ERR_PTR(-ENOENT);
4879 EXPORT_SYMBOL_GPL(nft_obj_lookup);
4881 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
4882 const struct nlattr *nla,
4883 u32 objtype, u8 genmask)
4885 struct nft_object *obj;
4887 list_for_each_entry(obj, &table->objects, list) {
4888 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
4889 objtype == obj->ops->type->type &&
4890 nft_active_genmask(obj, genmask))
4893 return ERR_PTR(-ENOENT);
4896 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4897 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4898 .len = NFT_TABLE_MAXNAMELEN - 1 },
4899 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4900 .len = NFT_OBJ_MAXNAMELEN - 1 },
4901 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4902 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4903 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
4906 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4907 const struct nft_object_type *type,
4908 const struct nlattr *attr)
4911 const struct nft_object_ops *ops;
4912 struct nft_object *obj;
4915 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
4920 err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
4925 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4928 if (type->select_ops) {
4929 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
4939 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
4943 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
4956 return ERR_PTR(err);
4959 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
4960 struct nft_object *obj, bool reset)
4962 struct nlattr *nest;
4964 nest = nla_nest_start(skb, attr);
4966 goto nla_put_failure;
4967 if (obj->ops->dump(skb, obj, reset) < 0)
4968 goto nla_put_failure;
4969 nla_nest_end(skb, nest);
4976 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4978 const struct nft_object_type *type;
4980 list_for_each_entry(type, &nf_tables_objects, list) {
4981 if (objtype == type->type)
4987 static const struct nft_object_type *
4988 nft_obj_type_get(struct net *net, u32 objtype)
4990 const struct nft_object_type *type;
4992 type = __nft_obj_type_get(objtype);
4993 if (type != NULL && try_module_get(type->owner))
4996 lockdep_nfnl_nft_mutex_not_held();
4997 #ifdef CONFIG_MODULES
4999 nft_request_module(net, "nft-obj-%u", objtype);
5000 if (__nft_obj_type_get(objtype))
5001 return ERR_PTR(-EAGAIN);
5004 return ERR_PTR(-ENOENT);
5007 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
5008 struct sk_buff *skb, const struct nlmsghdr *nlh,
5009 const struct nlattr * const nla[],
5010 struct netlink_ext_ack *extack)
5012 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5013 const struct nft_object_type *type;
5014 u8 genmask = nft_genmask_next(net);
5015 int family = nfmsg->nfgen_family;
5016 struct nft_table *table;
5017 struct nft_object *obj;
5022 if (!nla[NFTA_OBJ_TYPE] ||
5023 !nla[NFTA_OBJ_NAME] ||
5024 !nla[NFTA_OBJ_DATA])
5027 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5028 if (IS_ERR(table)) {
5029 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5030 return PTR_ERR(table);
5033 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5034 obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
5037 if (err != -ENOENT) {
5038 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5042 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5043 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5049 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5051 type = nft_obj_type_get(net, objtype);
5053 return PTR_ERR(type);
5055 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
5061 obj->handle = nf_tables_alloc_handle(table);
5063 obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
5069 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
5073 list_add_tail_rcu(&obj->list, &table->objects);
5079 if (obj->ops->destroy)
5080 obj->ops->destroy(&ctx, obj);
5083 module_put(type->owner);
5087 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
5088 u32 portid, u32 seq, int event, u32 flags,
5089 int family, const struct nft_table *table,
5090 struct nft_object *obj, bool reset)
5092 struct nfgenmsg *nfmsg;
5093 struct nlmsghdr *nlh;
5095 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5096 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5098 goto nla_put_failure;
5100 nfmsg = nlmsg_data(nlh);
5101 nfmsg->nfgen_family = family;
5102 nfmsg->version = NFNETLINK_V0;
5103 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5105 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
5106 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
5107 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
5108 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
5109 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
5110 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
5112 goto nla_put_failure;
5114 nlmsg_end(skb, nlh);
5118 nlmsg_trim(skb, nlh);
5122 struct nft_obj_filter {
5127 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
5129 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5130 const struct nft_table *table;
5131 unsigned int idx = 0, s_idx = cb->args[0];
5132 struct nft_obj_filter *filter = cb->data;
5133 struct net *net = sock_net(skb->sk);
5134 int family = nfmsg->nfgen_family;
5135 struct nft_object *obj;
5138 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5142 cb->seq = net->nft.base_seq;
5144 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5145 if (family != NFPROTO_UNSPEC && family != table->family)
5148 list_for_each_entry_rcu(obj, &table->objects, list) {
5149 if (!nft_is_active(net, obj))
5154 memset(&cb->args[1], 0,
5155 sizeof(cb->args) - sizeof(cb->args[0]));
5156 if (filter && filter->table &&
5157 strcmp(filter->table, table->name))
5160 filter->type != NFT_OBJECT_UNSPEC &&
5161 obj->ops->type->type != filter->type)
5164 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
5167 NLM_F_MULTI | NLM_F_APPEND,
5168 table->family, table,
5172 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5184 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
5186 const struct nlattr * const *nla = cb->data;
5187 struct nft_obj_filter *filter = NULL;
5189 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
5190 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5194 if (nla[NFTA_OBJ_TABLE]) {
5195 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
5196 if (!filter->table) {
5202 if (nla[NFTA_OBJ_TYPE])
5203 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5210 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
5212 struct nft_obj_filter *filter = cb->data;
5215 kfree(filter->table);
5222 /* called with rcu_read_lock held */
5223 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
5224 struct sk_buff *skb, const struct nlmsghdr *nlh,
5225 const struct nlattr * const nla[],
5226 struct netlink_ext_ack *extack)
5228 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5229 u8 genmask = nft_genmask_cur(net);
5230 int family = nfmsg->nfgen_family;
5231 const struct nft_table *table;
5232 struct nft_object *obj;
5233 struct sk_buff *skb2;
5238 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5239 struct netlink_dump_control c = {
5240 .start = nf_tables_dump_obj_start,
5241 .dump = nf_tables_dump_obj,
5242 .done = nf_tables_dump_obj_done,
5243 .module = THIS_MODULE,
5244 .data = (void *)nla,
5247 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5250 if (!nla[NFTA_OBJ_NAME] ||
5251 !nla[NFTA_OBJ_TYPE])
5254 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5255 if (IS_ERR(table)) {
5256 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5257 return PTR_ERR(table);
5260 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5261 obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
5263 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5264 return PTR_ERR(obj);
5267 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5271 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5274 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
5275 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
5276 family, table, obj, reset);
5278 goto err_fill_obj_info;
5280 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
5287 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
5289 if (obj->ops->destroy)
5290 obj->ops->destroy(ctx, obj);
5292 module_put(obj->ops->type->owner);
5297 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
5298 struct sk_buff *skb, const struct nlmsghdr *nlh,
5299 const struct nlattr * const nla[],
5300 struct netlink_ext_ack *extack)
5302 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5303 u8 genmask = nft_genmask_next(net);
5304 int family = nfmsg->nfgen_family;
5305 const struct nlattr *attr;
5306 struct nft_table *table;
5307 struct nft_object *obj;
5311 if (!nla[NFTA_OBJ_TYPE] ||
5312 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
5315 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5316 if (IS_ERR(table)) {
5317 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5318 return PTR_ERR(table);
5321 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5322 if (nla[NFTA_OBJ_HANDLE]) {
5323 attr = nla[NFTA_OBJ_HANDLE];
5324 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
5326 attr = nla[NFTA_OBJ_NAME];
5327 obj = nft_obj_lookup(table, attr, objtype, genmask);
5331 NL_SET_BAD_ATTR(extack, attr);
5332 return PTR_ERR(obj);
5335 NL_SET_BAD_ATTR(extack, attr);
5339 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5341 return nft_delobj(&ctx, obj);
5344 void nft_obj_notify(struct net *net, struct nft_table *table,
5345 struct nft_object *obj, u32 portid, u32 seq, int event,
5346 int family, int report, gfp_t gfp)
5348 struct sk_buff *skb;
5352 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5355 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
5359 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
5366 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
5369 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5371 EXPORT_SYMBOL_GPL(nft_obj_notify);
5373 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
5374 struct nft_object *obj, int event)
5376 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
5377 ctx->family, ctx->report, GFP_KERNEL);
5383 void nft_register_flowtable_type(struct nf_flowtable_type *type)
5385 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5386 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
5387 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5389 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
5391 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
5393 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5394 list_del_rcu(&type->list);
5395 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5397 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
5399 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
5400 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
5401 .len = NFT_NAME_MAXLEN - 1 },
5402 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
5403 .len = NFT_NAME_MAXLEN - 1 },
5404 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
5405 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
5408 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
5409 const struct nlattr *nla, u8 genmask)
5411 struct nft_flowtable *flowtable;
5413 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5414 if (!nla_strcmp(nla, flowtable->name) &&
5415 nft_active_genmask(flowtable, genmask))
5418 return ERR_PTR(-ENOENT);
5420 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
5422 static struct nft_flowtable *
5423 nft_flowtable_lookup_byhandle(const struct nft_table *table,
5424 const struct nlattr *nla, u8 genmask)
5426 struct nft_flowtable *flowtable;
5428 list_for_each_entry(flowtable, &table->flowtables, list) {
5429 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
5430 nft_active_genmask(flowtable, genmask))
5433 return ERR_PTR(-ENOENT);
5436 static int nf_tables_parse_devices(const struct nft_ctx *ctx,
5437 const struct nlattr *attr,
5438 struct net_device *dev_array[], int *len)
5440 const struct nlattr *tmp;
5441 struct net_device *dev;
5442 char ifname[IFNAMSIZ];
5443 int rem, n = 0, err;
5445 nla_for_each_nested(tmp, attr, rem) {
5446 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
5451 nla_strlcpy(ifname, tmp, IFNAMSIZ);
5452 dev = __dev_get_by_name(ctx->net, ifname);
5458 dev_array[n++] = dev;
5459 if (n == NFT_FLOWTABLE_DEVICE_MAX) {
5473 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
5474 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
5475 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
5476 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
5479 static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx,
5480 const struct nlattr *attr,
5481 struct nft_flowtable *flowtable)
5483 struct net_device *dev_array[NFT_FLOWTABLE_DEVICE_MAX];
5484 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
5485 struct nf_hook_ops *ops;
5486 int hooknum, priority;
5489 err = nla_parse_nested(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
5490 nft_flowtable_hook_policy, NULL);
5494 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
5495 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] ||
5496 !tb[NFTA_FLOWTABLE_HOOK_DEVS])
5499 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
5500 if (hooknum != NF_NETDEV_INGRESS)
5503 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
5505 err = nf_tables_parse_devices(ctx, tb[NFTA_FLOWTABLE_HOOK_DEVS],
5510 ops = kcalloc(n, sizeof(struct nf_hook_ops), GFP_KERNEL);
5514 flowtable->hooknum = hooknum;
5515 flowtable->priority = priority;
5516 flowtable->ops = ops;
5517 flowtable->ops_len = n;
5519 for (i = 0; i < n; i++) {
5520 flowtable->ops[i].pf = NFPROTO_NETDEV;
5521 flowtable->ops[i].hooknum = hooknum;
5522 flowtable->ops[i].priority = priority;
5523 flowtable->ops[i].priv = &flowtable->data;
5524 flowtable->ops[i].hook = flowtable->data.type->hook;
5525 flowtable->ops[i].dev = dev_array[i];
5531 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
5533 const struct nf_flowtable_type *type;
5535 list_for_each_entry(type, &nf_tables_flowtables, list) {
5536 if (family == type->family)
5542 static const struct nf_flowtable_type *
5543 nft_flowtable_type_get(struct net *net, u8 family)
5545 const struct nf_flowtable_type *type;
5547 type = __nft_flowtable_type_get(family);
5548 if (type != NULL && try_module_get(type->owner))
5551 lockdep_nfnl_nft_mutex_not_held();
5552 #ifdef CONFIG_MODULES
5554 nft_request_module(net, "nf-flowtable-%u", family);
5555 if (__nft_flowtable_type_get(family))
5556 return ERR_PTR(-EAGAIN);
5559 return ERR_PTR(-ENOENT);
5562 static void nft_unregister_flowtable_net_hooks(struct net *net,
5563 struct nft_flowtable *flowtable)
5567 for (i = 0; i < flowtable->ops_len; i++) {
5568 if (!flowtable->ops[i].dev)
5571 nf_unregister_net_hook(net, &flowtable->ops[i]);
5575 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
5576 struct sk_buff *skb,
5577 const struct nlmsghdr *nlh,
5578 const struct nlattr * const nla[],
5579 struct netlink_ext_ack *extack)
5581 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5582 const struct nf_flowtable_type *type;
5583 struct nft_flowtable *flowtable, *ft;
5584 u8 genmask = nft_genmask_next(net);
5585 int family = nfmsg->nfgen_family;
5586 struct nft_table *table;
5590 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5591 !nla[NFTA_FLOWTABLE_NAME] ||
5592 !nla[NFTA_FLOWTABLE_HOOK])
5595 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5597 if (IS_ERR(table)) {
5598 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5599 return PTR_ERR(table);
5602 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5604 if (IS_ERR(flowtable)) {
5605 err = PTR_ERR(flowtable);
5606 if (err != -ENOENT) {
5607 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5611 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5612 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5619 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5621 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
5625 flowtable->table = table;
5626 flowtable->handle = nf_tables_alloc_handle(table);
5628 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
5629 if (!flowtable->name) {
5634 type = nft_flowtable_type_get(net, family);
5636 err = PTR_ERR(type);
5640 flowtable->data.type = type;
5641 err = type->init(&flowtable->data);
5645 err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
5650 for (i = 0; i < flowtable->ops_len; i++) {
5651 if (!flowtable->ops[i].dev)
5654 list_for_each_entry(ft, &table->flowtables, list) {
5655 for (k = 0; k < ft->ops_len; k++) {
5656 if (!ft->ops[k].dev)
5659 if (flowtable->ops[i].dev == ft->ops[k].dev &&
5660 flowtable->ops[i].pf == ft->ops[k].pf) {
5667 err = nf_register_net_hook(net, &flowtable->ops[i]);
5672 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
5676 list_add_tail_rcu(&flowtable->list, &table->flowtables);
5681 i = flowtable->ops_len;
5683 for (k = i - 1; k >= 0; k--)
5684 nf_unregister_net_hook(net, &flowtable->ops[k]);
5686 kfree(flowtable->ops);
5688 flowtable->data.type->free(&flowtable->data);
5690 module_put(type->owner);
5692 kfree(flowtable->name);
5698 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
5699 struct sk_buff *skb,
5700 const struct nlmsghdr *nlh,
5701 const struct nlattr * const nla[],
5702 struct netlink_ext_ack *extack)
5704 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5705 u8 genmask = nft_genmask_next(net);
5706 int family = nfmsg->nfgen_family;
5707 struct nft_flowtable *flowtable;
5708 const struct nlattr *attr;
5709 struct nft_table *table;
5712 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5713 (!nla[NFTA_FLOWTABLE_NAME] &&
5714 !nla[NFTA_FLOWTABLE_HANDLE]))
5717 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5719 if (IS_ERR(table)) {
5720 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5721 return PTR_ERR(table);
5724 if (nla[NFTA_FLOWTABLE_HANDLE]) {
5725 attr = nla[NFTA_FLOWTABLE_HANDLE];
5726 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
5728 attr = nla[NFTA_FLOWTABLE_NAME];
5729 flowtable = nft_flowtable_lookup(table, attr, genmask);
5732 if (IS_ERR(flowtable)) {
5733 NL_SET_BAD_ATTR(extack, attr);
5734 return PTR_ERR(flowtable);
5736 if (flowtable->use > 0) {
5737 NL_SET_BAD_ATTR(extack, attr);
5741 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5743 return nft_delflowtable(&ctx, flowtable);
5746 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
5747 u32 portid, u32 seq, int event,
5748 u32 flags, int family,
5749 struct nft_flowtable *flowtable)
5751 struct nlattr *nest, *nest_devs;
5752 struct nfgenmsg *nfmsg;
5753 struct nlmsghdr *nlh;
5756 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5757 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5759 goto nla_put_failure;
5761 nfmsg = nlmsg_data(nlh);
5762 nfmsg->nfgen_family = family;
5763 nfmsg->version = NFNETLINK_V0;
5764 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5766 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
5767 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
5768 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
5769 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
5770 NFTA_FLOWTABLE_PAD))
5771 goto nla_put_failure;
5773 nest = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK);
5775 goto nla_put_failure;
5776 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
5777 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->priority)))
5778 goto nla_put_failure;
5780 nest_devs = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK_DEVS);
5782 goto nla_put_failure;
5784 for (i = 0; i < flowtable->ops_len; i++) {
5785 const struct net_device *dev = READ_ONCE(flowtable->ops[i].dev);
5788 nla_put_string(skb, NFTA_DEVICE_NAME, dev->name))
5789 goto nla_put_failure;
5791 nla_nest_end(skb, nest_devs);
5792 nla_nest_end(skb, nest);
5794 nlmsg_end(skb, nlh);
5798 nlmsg_trim(skb, nlh);
5802 struct nft_flowtable_filter {
5806 static int nf_tables_dump_flowtable(struct sk_buff *skb,
5807 struct netlink_callback *cb)
5809 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5810 struct nft_flowtable_filter *filter = cb->data;
5811 unsigned int idx = 0, s_idx = cb->args[0];
5812 struct net *net = sock_net(skb->sk);
5813 int family = nfmsg->nfgen_family;
5814 struct nft_flowtable *flowtable;
5815 const struct nft_table *table;
5818 cb->seq = net->nft.base_seq;
5820 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5821 if (family != NFPROTO_UNSPEC && family != table->family)
5824 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5825 if (!nft_is_active(net, flowtable))
5830 memset(&cb->args[1], 0,
5831 sizeof(cb->args) - sizeof(cb->args[0]));
5832 if (filter && filter->table &&
5833 strcmp(filter->table, table->name))
5836 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
5838 NFT_MSG_NEWFLOWTABLE,
5839 NLM_F_MULTI | NLM_F_APPEND,
5840 table->family, flowtable) < 0)
5843 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5855 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
5857 const struct nlattr * const *nla = cb->data;
5858 struct nft_flowtable_filter *filter = NULL;
5860 if (nla[NFTA_FLOWTABLE_TABLE]) {
5861 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5865 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
5867 if (!filter->table) {
5877 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
5879 struct nft_flowtable_filter *filter = cb->data;
5884 kfree(filter->table);
5890 /* called with rcu_read_lock held */
5891 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
5892 struct sk_buff *skb,
5893 const struct nlmsghdr *nlh,
5894 const struct nlattr * const nla[],
5895 struct netlink_ext_ack *extack)
5897 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5898 u8 genmask = nft_genmask_cur(net);
5899 int family = nfmsg->nfgen_family;
5900 struct nft_flowtable *flowtable;
5901 const struct nft_table *table;
5902 struct sk_buff *skb2;
5905 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5906 struct netlink_dump_control c = {
5907 .start = nf_tables_dump_flowtable_start,
5908 .dump = nf_tables_dump_flowtable,
5909 .done = nf_tables_dump_flowtable_done,
5910 .module = THIS_MODULE,
5911 .data = (void *)nla,
5914 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5917 if (!nla[NFTA_FLOWTABLE_NAME])
5920 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5923 return PTR_ERR(table);
5925 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5927 if (IS_ERR(flowtable))
5928 return PTR_ERR(flowtable);
5930 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5934 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
5936 NFT_MSG_NEWFLOWTABLE, 0, family,
5939 goto err_fill_flowtable_info;
5941 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
5943 err_fill_flowtable_info:
5948 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
5949 struct nft_flowtable *flowtable,
5952 struct sk_buff *skb;
5956 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
5959 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5963 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
5965 ctx->family, flowtable);
5971 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
5972 ctx->report, GFP_KERNEL);
5975 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
5978 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
5980 kfree(flowtable->ops);
5981 kfree(flowtable->name);
5982 flowtable->data.type->free(&flowtable->data);
5983 module_put(flowtable->data.type->owner);
5987 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
5988 u32 portid, u32 seq)
5990 struct nlmsghdr *nlh;
5991 struct nfgenmsg *nfmsg;
5992 char buf[TASK_COMM_LEN];
5993 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
5995 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
5997 goto nla_put_failure;
5999 nfmsg = nlmsg_data(nlh);
6000 nfmsg->nfgen_family = AF_UNSPEC;
6001 nfmsg->version = NFNETLINK_V0;
6002 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
6004 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
6005 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
6006 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
6007 goto nla_put_failure;
6009 nlmsg_end(skb, nlh);
6013 nlmsg_trim(skb, nlh);
6017 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
6018 struct nft_flowtable *flowtable)
6022 for (i = 0; i < flowtable->ops_len; i++) {
6023 if (flowtable->ops[i].dev != dev)
6026 nf_unregister_net_hook(dev_net(dev), &flowtable->ops[i]);
6027 flowtable->ops[i].dev = NULL;
6032 static int nf_tables_flowtable_event(struct notifier_block *this,
6033 unsigned long event, void *ptr)
6035 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
6036 struct nft_flowtable *flowtable;
6037 struct nft_table *table;
6040 if (event != NETDEV_UNREGISTER)
6044 mutex_lock(&net->nft.commit_mutex);
6045 list_for_each_entry(table, &net->nft.tables, list) {
6046 list_for_each_entry(flowtable, &table->flowtables, list) {
6047 nft_flowtable_event(event, dev, flowtable);
6050 mutex_unlock(&net->nft.commit_mutex);
6055 static struct notifier_block nf_tables_flowtable_notifier = {
6056 .notifier_call = nf_tables_flowtable_event,
6059 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
6062 struct nlmsghdr *nlh = nlmsg_hdr(skb);
6063 struct sk_buff *skb2;
6066 if (nlmsg_report(nlh) &&
6067 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6070 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6074 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6081 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6082 nlmsg_report(nlh), GFP_KERNEL);
6085 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6089 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
6090 struct sk_buff *skb, const struct nlmsghdr *nlh,
6091 const struct nlattr * const nla[],
6092 struct netlink_ext_ack *extack)
6094 struct sk_buff *skb2;
6097 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6101 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6104 goto err_fill_gen_info;
6106 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6113 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
6114 [NFT_MSG_NEWTABLE] = {
6115 .call_batch = nf_tables_newtable,
6116 .attr_count = NFTA_TABLE_MAX,
6117 .policy = nft_table_policy,
6119 [NFT_MSG_GETTABLE] = {
6120 .call_rcu = nf_tables_gettable,
6121 .attr_count = NFTA_TABLE_MAX,
6122 .policy = nft_table_policy,
6124 [NFT_MSG_DELTABLE] = {
6125 .call_batch = nf_tables_deltable,
6126 .attr_count = NFTA_TABLE_MAX,
6127 .policy = nft_table_policy,
6129 [NFT_MSG_NEWCHAIN] = {
6130 .call_batch = nf_tables_newchain,
6131 .attr_count = NFTA_CHAIN_MAX,
6132 .policy = nft_chain_policy,
6134 [NFT_MSG_GETCHAIN] = {
6135 .call_rcu = nf_tables_getchain,
6136 .attr_count = NFTA_CHAIN_MAX,
6137 .policy = nft_chain_policy,
6139 [NFT_MSG_DELCHAIN] = {
6140 .call_batch = nf_tables_delchain,
6141 .attr_count = NFTA_CHAIN_MAX,
6142 .policy = nft_chain_policy,
6144 [NFT_MSG_NEWRULE] = {
6145 .call_batch = nf_tables_newrule,
6146 .attr_count = NFTA_RULE_MAX,
6147 .policy = nft_rule_policy,
6149 [NFT_MSG_GETRULE] = {
6150 .call_rcu = nf_tables_getrule,
6151 .attr_count = NFTA_RULE_MAX,
6152 .policy = nft_rule_policy,
6154 [NFT_MSG_DELRULE] = {
6155 .call_batch = nf_tables_delrule,
6156 .attr_count = NFTA_RULE_MAX,
6157 .policy = nft_rule_policy,
6159 [NFT_MSG_NEWSET] = {
6160 .call_batch = nf_tables_newset,
6161 .attr_count = NFTA_SET_MAX,
6162 .policy = nft_set_policy,
6164 [NFT_MSG_GETSET] = {
6165 .call_rcu = nf_tables_getset,
6166 .attr_count = NFTA_SET_MAX,
6167 .policy = nft_set_policy,
6169 [NFT_MSG_DELSET] = {
6170 .call_batch = nf_tables_delset,
6171 .attr_count = NFTA_SET_MAX,
6172 .policy = nft_set_policy,
6174 [NFT_MSG_NEWSETELEM] = {
6175 .call_batch = nf_tables_newsetelem,
6176 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6177 .policy = nft_set_elem_list_policy,
6179 [NFT_MSG_GETSETELEM] = {
6180 .call_rcu = nf_tables_getsetelem,
6181 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6182 .policy = nft_set_elem_list_policy,
6184 [NFT_MSG_DELSETELEM] = {
6185 .call_batch = nf_tables_delsetelem,
6186 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6187 .policy = nft_set_elem_list_policy,
6189 [NFT_MSG_GETGEN] = {
6190 .call_rcu = nf_tables_getgen,
6192 [NFT_MSG_NEWOBJ] = {
6193 .call_batch = nf_tables_newobj,
6194 .attr_count = NFTA_OBJ_MAX,
6195 .policy = nft_obj_policy,
6197 [NFT_MSG_GETOBJ] = {
6198 .call_rcu = nf_tables_getobj,
6199 .attr_count = NFTA_OBJ_MAX,
6200 .policy = nft_obj_policy,
6202 [NFT_MSG_DELOBJ] = {
6203 .call_batch = nf_tables_delobj,
6204 .attr_count = NFTA_OBJ_MAX,
6205 .policy = nft_obj_policy,
6207 [NFT_MSG_GETOBJ_RESET] = {
6208 .call_rcu = nf_tables_getobj,
6209 .attr_count = NFTA_OBJ_MAX,
6210 .policy = nft_obj_policy,
6212 [NFT_MSG_NEWFLOWTABLE] = {
6213 .call_batch = nf_tables_newflowtable,
6214 .attr_count = NFTA_FLOWTABLE_MAX,
6215 .policy = nft_flowtable_policy,
6217 [NFT_MSG_GETFLOWTABLE] = {
6218 .call_rcu = nf_tables_getflowtable,
6219 .attr_count = NFTA_FLOWTABLE_MAX,
6220 .policy = nft_flowtable_policy,
6222 [NFT_MSG_DELFLOWTABLE] = {
6223 .call_batch = nf_tables_delflowtable,
6224 .attr_count = NFTA_FLOWTABLE_MAX,
6225 .policy = nft_flowtable_policy,
6229 static int nf_tables_validate(struct net *net)
6231 struct nft_table *table;
6233 switch (net->nft.validate_state) {
6234 case NFT_VALIDATE_SKIP:
6236 case NFT_VALIDATE_NEED:
6237 nft_validate_state_update(net, NFT_VALIDATE_DO);
6239 case NFT_VALIDATE_DO:
6240 list_for_each_entry(table, &net->nft.tables, list) {
6241 if (nft_table_validate(net, table) < 0)
6250 static void nft_chain_commit_update(struct nft_trans *trans)
6252 struct nft_base_chain *basechain;
6254 if (nft_trans_chain_name(trans)) {
6255 rhltable_remove(&trans->ctx.table->chains_ht,
6256 &trans->ctx.chain->rhlhead,
6257 nft_chain_ht_params);
6258 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
6259 rhltable_insert_key(&trans->ctx.table->chains_ht,
6260 trans->ctx.chain->name,
6261 &trans->ctx.chain->rhlhead,
6262 nft_chain_ht_params);
6265 if (!nft_is_base_chain(trans->ctx.chain))
6268 basechain = nft_base_chain(trans->ctx.chain);
6269 nft_chain_stats_replace(trans->ctx.net, basechain,
6270 nft_trans_chain_stats(trans));
6272 switch (nft_trans_chain_policy(trans)) {
6275 basechain->policy = nft_trans_chain_policy(trans);
6280 static void nft_commit_release(struct nft_trans *trans)
6282 switch (trans->msg_type) {
6283 case NFT_MSG_DELTABLE:
6284 nf_tables_table_destroy(&trans->ctx);
6286 case NFT_MSG_NEWCHAIN:
6287 kfree(nft_trans_chain_name(trans));
6289 case NFT_MSG_DELCHAIN:
6290 nf_tables_chain_destroy(&trans->ctx);
6292 case NFT_MSG_DELRULE:
6293 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6295 case NFT_MSG_DELSET:
6296 nft_set_destroy(nft_trans_set(trans));
6298 case NFT_MSG_DELSETELEM:
6299 nf_tables_set_elem_destroy(&trans->ctx,
6300 nft_trans_elem_set(trans),
6301 nft_trans_elem(trans).priv);
6303 case NFT_MSG_DELOBJ:
6304 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6306 case NFT_MSG_DELFLOWTABLE:
6307 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6313 static void nf_tables_commit_release(struct net *net)
6315 struct nft_trans *trans, *next;
6317 if (list_empty(&net->nft.commit_list))
6322 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6323 list_del(&trans->list);
6324 nft_commit_release(trans);
6328 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
6330 struct nft_rule *rule;
6331 unsigned int alloc = 0;
6334 /* already handled or inactive chain? */
6335 if (chain->rules_next || !nft_is_active_next(net, chain))
6338 rule = list_entry(&chain->rules, struct nft_rule, list);
6341 list_for_each_entry_continue(rule, &chain->rules, list) {
6342 if (nft_is_active_next(net, rule))
6346 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
6347 if (!chain->rules_next)
6350 list_for_each_entry_continue(rule, &chain->rules, list) {
6351 if (nft_is_active_next(net, rule))
6352 chain->rules_next[i++] = rule;
6355 chain->rules_next[i] = NULL;
6359 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
6361 struct nft_trans *trans, *next;
6363 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6364 struct nft_chain *chain = trans->ctx.chain;
6366 if (trans->msg_type == NFT_MSG_NEWRULE ||
6367 trans->msg_type == NFT_MSG_DELRULE) {
6368 kvfree(chain->rules_next);
6369 chain->rules_next = NULL;
6374 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
6376 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
6381 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
6383 struct nft_rule **r = rules;
6384 struct nft_rules_old *old;
6389 r++; /* rcu_head is after end marker */
6393 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
6396 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
6398 struct nft_rule **g0, **g1;
6401 next_genbit = nft_gencursor_next(net);
6403 g0 = rcu_dereference_protected(chain->rules_gen_0,
6404 lockdep_commit_lock_is_held(net));
6405 g1 = rcu_dereference_protected(chain->rules_gen_1,
6406 lockdep_commit_lock_is_held(net));
6408 /* No changes to this chain? */
6409 if (chain->rules_next == NULL) {
6410 /* chain had no change in last or next generation */
6414 * chain had no change in this generation; make sure next
6415 * one uses same rules as current generation.
6418 rcu_assign_pointer(chain->rules_gen_1, g0);
6419 nf_tables_commit_chain_free_rules_old(g1);
6421 rcu_assign_pointer(chain->rules_gen_0, g1);
6422 nf_tables_commit_chain_free_rules_old(g0);
6429 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
6431 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
6433 chain->rules_next = NULL;
6439 nf_tables_commit_chain_free_rules_old(g1);
6441 nf_tables_commit_chain_free_rules_old(g0);
6444 static void nft_chain_del(struct nft_chain *chain)
6446 struct nft_table *table = chain->table;
6448 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
6449 nft_chain_ht_params));
6450 list_del_rcu(&chain->list);
6453 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
6455 struct nft_trans *trans, *next;
6456 struct nft_trans_elem *te;
6457 struct nft_chain *chain;
6458 struct nft_table *table;
6460 /* 0. Validate ruleset, otherwise roll back for error reporting. */
6461 if (nf_tables_validate(net) < 0)
6464 /* 1. Allocate space for next generation rules_gen_X[] */
6465 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6468 if (trans->msg_type == NFT_MSG_NEWRULE ||
6469 trans->msg_type == NFT_MSG_DELRULE) {
6470 chain = trans->ctx.chain;
6472 ret = nf_tables_commit_chain_prepare(net, chain);
6474 nf_tables_commit_chain_prepare_cancel(net);
6480 /* step 2. Make rules_gen_X visible to packet path */
6481 list_for_each_entry(table, &net->nft.tables, list) {
6482 list_for_each_entry(chain, &table->chains, list)
6483 nf_tables_commit_chain(net, chain);
6487 * Bump generation counter, invalidate any dump in progress.
6488 * Cannot fail after this point.
6490 while (++net->nft.base_seq == 0);
6492 /* step 3. Start new generation, rules_gen_X now in use. */
6493 net->nft.gencursor = nft_gencursor_next(net);
6495 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6496 switch (trans->msg_type) {
6497 case NFT_MSG_NEWTABLE:
6498 if (nft_trans_table_update(trans)) {
6499 if (!nft_trans_table_enable(trans)) {
6500 nf_tables_table_disable(net,
6502 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6505 nft_clear(net, trans->ctx.table);
6507 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
6508 nft_trans_destroy(trans);
6510 case NFT_MSG_DELTABLE:
6511 list_del_rcu(&trans->ctx.table->list);
6512 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
6514 case NFT_MSG_NEWCHAIN:
6515 if (nft_trans_chain_update(trans)) {
6516 nft_chain_commit_update(trans);
6517 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6518 /* trans destroyed after rcu grace period */
6520 nft_clear(net, trans->ctx.chain);
6521 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6522 nft_trans_destroy(trans);
6525 case NFT_MSG_DELCHAIN:
6526 nft_chain_del(trans->ctx.chain);
6527 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
6528 nf_tables_unregister_hook(trans->ctx.net,
6532 case NFT_MSG_NEWRULE:
6533 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6534 nf_tables_rule_notify(&trans->ctx,
6535 nft_trans_rule(trans),
6537 nft_trans_destroy(trans);
6539 case NFT_MSG_DELRULE:
6540 list_del_rcu(&nft_trans_rule(trans)->list);
6541 nf_tables_rule_notify(&trans->ctx,
6542 nft_trans_rule(trans),
6544 nft_rule_expr_deactivate(&trans->ctx,
6545 nft_trans_rule(trans),
6548 case NFT_MSG_NEWSET:
6549 nft_clear(net, nft_trans_set(trans));
6550 /* This avoids hitting -EBUSY when deleting the table
6551 * from the transaction.
6553 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
6554 !list_empty(&nft_trans_set(trans)->bindings))
6555 trans->ctx.table->use--;
6557 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6558 NFT_MSG_NEWSET, GFP_KERNEL);
6559 nft_trans_destroy(trans);
6561 case NFT_MSG_DELSET:
6562 list_del_rcu(&nft_trans_set(trans)->list);
6563 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6564 NFT_MSG_DELSET, GFP_KERNEL);
6566 case NFT_MSG_NEWSETELEM:
6567 te = (struct nft_trans_elem *)trans->data;
6569 te->set->ops->activate(net, te->set, &te->elem);
6570 nf_tables_setelem_notify(&trans->ctx, te->set,
6572 NFT_MSG_NEWSETELEM, 0);
6573 nft_trans_destroy(trans);
6575 case NFT_MSG_DELSETELEM:
6576 te = (struct nft_trans_elem *)trans->data;
6578 nf_tables_setelem_notify(&trans->ctx, te->set,
6580 NFT_MSG_DELSETELEM, 0);
6581 te->set->ops->remove(net, te->set, &te->elem);
6582 atomic_dec(&te->set->nelems);
6585 case NFT_MSG_NEWOBJ:
6586 nft_clear(net, nft_trans_obj(trans));
6587 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6589 nft_trans_destroy(trans);
6591 case NFT_MSG_DELOBJ:
6592 list_del_rcu(&nft_trans_obj(trans)->list);
6593 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6596 case NFT_MSG_NEWFLOWTABLE:
6597 nft_clear(net, nft_trans_flowtable(trans));
6598 nf_tables_flowtable_notify(&trans->ctx,
6599 nft_trans_flowtable(trans),
6600 NFT_MSG_NEWFLOWTABLE);
6601 nft_trans_destroy(trans);
6603 case NFT_MSG_DELFLOWTABLE:
6604 list_del_rcu(&nft_trans_flowtable(trans)->list);
6605 nf_tables_flowtable_notify(&trans->ctx,
6606 nft_trans_flowtable(trans),
6607 NFT_MSG_DELFLOWTABLE);
6608 nft_unregister_flowtable_net_hooks(net,
6609 nft_trans_flowtable(trans));
6614 nf_tables_commit_release(net);
6615 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
6616 mutex_unlock(&net->nft.commit_mutex);
6621 static void nf_tables_abort_release(struct nft_trans *trans)
6623 switch (trans->msg_type) {
6624 case NFT_MSG_NEWTABLE:
6625 nf_tables_table_destroy(&trans->ctx);
6627 case NFT_MSG_NEWCHAIN:
6628 nf_tables_chain_destroy(&trans->ctx);
6630 case NFT_MSG_NEWRULE:
6631 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6633 case NFT_MSG_NEWSET:
6634 nft_set_destroy(nft_trans_set(trans));
6636 case NFT_MSG_NEWSETELEM:
6637 nft_set_elem_destroy(nft_trans_elem_set(trans),
6638 nft_trans_elem(trans).priv, true);
6640 case NFT_MSG_NEWOBJ:
6641 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6643 case NFT_MSG_NEWFLOWTABLE:
6644 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6650 static int __nf_tables_abort(struct net *net)
6652 struct nft_trans *trans, *next;
6653 struct nft_trans_elem *te;
6655 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
6657 switch (trans->msg_type) {
6658 case NFT_MSG_NEWTABLE:
6659 if (nft_trans_table_update(trans)) {
6660 if (nft_trans_table_enable(trans)) {
6661 nf_tables_table_disable(net,
6663 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6665 nft_trans_destroy(trans);
6667 list_del_rcu(&trans->ctx.table->list);
6670 case NFT_MSG_DELTABLE:
6671 nft_clear(trans->ctx.net, trans->ctx.table);
6672 nft_trans_destroy(trans);
6674 case NFT_MSG_NEWCHAIN:
6675 if (nft_trans_chain_update(trans)) {
6676 free_percpu(nft_trans_chain_stats(trans));
6677 kfree(nft_trans_chain_name(trans));
6678 nft_trans_destroy(trans);
6680 trans->ctx.table->use--;
6681 nft_chain_del(trans->ctx.chain);
6682 nf_tables_unregister_hook(trans->ctx.net,
6687 case NFT_MSG_DELCHAIN:
6688 trans->ctx.table->use++;
6689 nft_clear(trans->ctx.net, trans->ctx.chain);
6690 nft_trans_destroy(trans);
6692 case NFT_MSG_NEWRULE:
6693 trans->ctx.chain->use--;
6694 list_del_rcu(&nft_trans_rule(trans)->list);
6695 nft_rule_expr_deactivate(&trans->ctx,
6696 nft_trans_rule(trans),
6699 case NFT_MSG_DELRULE:
6700 trans->ctx.chain->use++;
6701 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6702 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
6703 nft_trans_destroy(trans);
6705 case NFT_MSG_NEWSET:
6706 trans->ctx.table->use--;
6707 if (nft_trans_set_bound(trans)) {
6708 nft_trans_destroy(trans);
6711 list_del_rcu(&nft_trans_set(trans)->list);
6713 case NFT_MSG_DELSET:
6714 trans->ctx.table->use++;
6715 nft_clear(trans->ctx.net, nft_trans_set(trans));
6716 nft_trans_destroy(trans);
6718 case NFT_MSG_NEWSETELEM:
6719 if (nft_trans_elem_set_bound(trans)) {
6720 nft_trans_destroy(trans);
6723 te = (struct nft_trans_elem *)trans->data;
6724 te->set->ops->remove(net, te->set, &te->elem);
6725 atomic_dec(&te->set->nelems);
6727 case NFT_MSG_DELSETELEM:
6728 te = (struct nft_trans_elem *)trans->data;
6730 nft_set_elem_activate(net, te->set, &te->elem);
6731 te->set->ops->activate(net, te->set, &te->elem);
6734 nft_trans_destroy(trans);
6736 case NFT_MSG_NEWOBJ:
6737 trans->ctx.table->use--;
6738 list_del_rcu(&nft_trans_obj(trans)->list);
6740 case NFT_MSG_DELOBJ:
6741 trans->ctx.table->use++;
6742 nft_clear(trans->ctx.net, nft_trans_obj(trans));
6743 nft_trans_destroy(trans);
6745 case NFT_MSG_NEWFLOWTABLE:
6746 trans->ctx.table->use--;
6747 list_del_rcu(&nft_trans_flowtable(trans)->list);
6748 nft_unregister_flowtable_net_hooks(net,
6749 nft_trans_flowtable(trans));
6751 case NFT_MSG_DELFLOWTABLE:
6752 trans->ctx.table->use++;
6753 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
6754 nft_trans_destroy(trans);
6761 list_for_each_entry_safe_reverse(trans, next,
6762 &net->nft.commit_list, list) {
6763 list_del(&trans->list);
6764 nf_tables_abort_release(trans);
6770 static void nf_tables_cleanup(struct net *net)
6772 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
6775 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
6777 int ret = __nf_tables_abort(net);
6779 mutex_unlock(&net->nft.commit_mutex);
6784 static bool nf_tables_valid_genid(struct net *net, u32 genid)
6788 mutex_lock(&net->nft.commit_mutex);
6790 genid_ok = genid == 0 || net->nft.base_seq == genid;
6792 mutex_unlock(&net->nft.commit_mutex);
6794 /* else, commit mutex has to be released by commit or abort function */
6798 static const struct nfnetlink_subsystem nf_tables_subsys = {
6799 .name = "nf_tables",
6800 .subsys_id = NFNL_SUBSYS_NFTABLES,
6801 .cb_count = NFT_MSG_MAX,
6803 .commit = nf_tables_commit,
6804 .abort = nf_tables_abort,
6805 .cleanup = nf_tables_cleanup,
6806 .valid_genid = nf_tables_valid_genid,
6807 .owner = THIS_MODULE,
6810 int nft_chain_validate_dependency(const struct nft_chain *chain,
6811 enum nft_chain_types type)
6813 const struct nft_base_chain *basechain;
6815 if (nft_is_base_chain(chain)) {
6816 basechain = nft_base_chain(chain);
6817 if (basechain->type->type != type)
6822 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
6824 int nft_chain_validate_hooks(const struct nft_chain *chain,
6825 unsigned int hook_flags)
6827 struct nft_base_chain *basechain;
6829 if (nft_is_base_chain(chain)) {
6830 basechain = nft_base_chain(chain);
6832 if ((1 << basechain->ops.hooknum) & hook_flags)
6840 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
6843 * Loop detection - walk through the ruleset beginning at the destination chain
6844 * of a new jump until either the source chain is reached (loop) or all
6845 * reachable chains have been traversed.
6847 * The loop check is performed whenever a new jump verdict is added to an
6848 * expression or verdict map or a verdict map is bound to a new chain.
6851 static int nf_tables_check_loops(const struct nft_ctx *ctx,
6852 const struct nft_chain *chain);
6854 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
6855 struct nft_set *set,
6856 const struct nft_set_iter *iter,
6857 struct nft_set_elem *elem)
6859 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6860 const struct nft_data *data;
6862 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6863 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
6866 data = nft_set_ext_data(ext);
6867 switch (data->verdict.code) {
6870 return nf_tables_check_loops(ctx, data->verdict.chain);
6876 static int nf_tables_check_loops(const struct nft_ctx *ctx,
6877 const struct nft_chain *chain)
6879 const struct nft_rule *rule;
6880 const struct nft_expr *expr, *last;
6881 struct nft_set *set;
6882 struct nft_set_binding *binding;
6883 struct nft_set_iter iter;
6885 if (ctx->chain == chain)
6888 list_for_each_entry(rule, &chain->rules, list) {
6889 nft_rule_for_each_expr(expr, last, rule) {
6890 struct nft_immediate_expr *priv;
6891 const struct nft_data *data;
6894 if (strcmp(expr->ops->type->name, "immediate"))
6897 priv = nft_expr_priv(expr);
6898 if (priv->dreg != NFT_REG_VERDICT)
6902 switch (data->verdict.code) {
6905 err = nf_tables_check_loops(ctx,
6906 data->verdict.chain);
6915 list_for_each_entry(set, &ctx->table->sets, list) {
6916 if (!nft_is_active_next(ctx->net, set))
6918 if (!(set->flags & NFT_SET_MAP) ||
6919 set->dtype != NFT_DATA_VERDICT)
6922 list_for_each_entry(binding, &set->bindings, list) {
6923 if (!(binding->flags & NFT_SET_MAP) ||
6924 binding->chain != chain)
6927 iter.genmask = nft_genmask_next(ctx->net);
6931 iter.fn = nf_tables_loop_check_setelem;
6933 set->ops->walk(ctx, set, &iter);
6943 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
6945 * @attr: netlink attribute to fetch value from
6946 * @max: maximum value to be stored in dest
6947 * @dest: pointer to the variable
6949 * Parse, check and store a given u32 netlink attribute into variable.
6950 * This function returns -ERANGE if the value goes over maximum value.
6951 * Otherwise a 0 is returned and the attribute value is stored in the
6952 * destination variable.
6954 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
6958 val = ntohl(nla_get_be32(attr));
6965 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
6968 * nft_parse_register - parse a register value from a netlink attribute
6970 * @attr: netlink attribute
6972 * Parse and translate a register value from a netlink attribute.
6973 * Registers used to be 128 bit wide, these register numbers will be
6974 * mapped to the corresponding 32 bit register numbers.
6976 unsigned int nft_parse_register(const struct nlattr *attr)
6980 reg = ntohl(nla_get_be32(attr));
6982 case NFT_REG_VERDICT...NFT_REG_4:
6983 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
6985 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
6988 EXPORT_SYMBOL_GPL(nft_parse_register);
6991 * nft_dump_register - dump a register value to a netlink attribute
6993 * @skb: socket buffer
6994 * @attr: attribute number
6995 * @reg: register number
6997 * Construct a netlink attribute containing the register number. For
6998 * compatibility reasons, register numbers being a multiple of 4 are
6999 * translated to the corresponding 128 bit register numbers.
7001 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
7003 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
7004 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
7006 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
7008 return nla_put_be32(skb, attr, htonl(reg));
7010 EXPORT_SYMBOL_GPL(nft_dump_register);
7013 * nft_validate_register_load - validate a load from a register
7015 * @reg: the register number
7016 * @len: the length of the data
7018 * Validate that the input register is one of the general purpose
7019 * registers and that the length of the load is within the bounds.
7021 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
7023 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7027 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
7032 EXPORT_SYMBOL_GPL(nft_validate_register_load);
7035 * nft_validate_register_store - validate an expressions' register store
7037 * @ctx: context of the expression performing the load
7038 * @reg: the destination register number
7039 * @data: the data to load
7040 * @type: the data type
7041 * @len: the length of the data
7043 * Validate that a data load uses the appropriate data type for
7044 * the destination register and the length is within the bounds.
7045 * A value of NULL for the data means that its runtime gathered
7048 int nft_validate_register_store(const struct nft_ctx *ctx,
7049 enum nft_registers reg,
7050 const struct nft_data *data,
7051 enum nft_data_types type, unsigned int len)
7056 case NFT_REG_VERDICT:
7057 if (type != NFT_DATA_VERDICT)
7061 (data->verdict.code == NFT_GOTO ||
7062 data->verdict.code == NFT_JUMP)) {
7063 err = nf_tables_check_loops(ctx, data->verdict.chain);
7070 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7074 if (reg * NFT_REG32_SIZE + len >
7075 FIELD_SIZEOF(struct nft_regs, data))
7078 if (data != NULL && type != NFT_DATA_VALUE)
7083 EXPORT_SYMBOL_GPL(nft_validate_register_store);
7085 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
7086 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
7087 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
7088 .len = NFT_CHAIN_MAXNAMELEN - 1 },
7091 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
7092 struct nft_data_desc *desc, const struct nlattr *nla)
7094 u8 genmask = nft_genmask_next(ctx->net);
7095 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
7096 struct nft_chain *chain;
7099 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
7104 if (!tb[NFTA_VERDICT_CODE])
7106 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
7108 switch (data->verdict.code) {
7110 switch (data->verdict.code & NF_VERDICT_MASK) {
7125 if (!tb[NFTA_VERDICT_CHAIN])
7127 chain = nft_chain_lookup(ctx->net, ctx->table,
7128 tb[NFTA_VERDICT_CHAIN], genmask);
7130 return PTR_ERR(chain);
7131 if (nft_is_base_chain(chain))
7135 data->verdict.chain = chain;
7139 desc->len = sizeof(data->verdict);
7140 desc->type = NFT_DATA_VERDICT;
7144 static void nft_verdict_uninit(const struct nft_data *data)
7146 switch (data->verdict.code) {
7149 data->verdict.chain->use--;
7154 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
7156 struct nlattr *nest;
7158 nest = nla_nest_start(skb, type);
7160 goto nla_put_failure;
7162 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
7163 goto nla_put_failure;
7168 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
7170 goto nla_put_failure;
7172 nla_nest_end(skb, nest);
7179 static int nft_value_init(const struct nft_ctx *ctx,
7180 struct nft_data *data, unsigned int size,
7181 struct nft_data_desc *desc, const struct nlattr *nla)
7191 nla_memcpy(data->data, nla, len);
7192 desc->type = NFT_DATA_VALUE;
7197 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
7200 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
7203 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
7204 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
7205 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
7209 * nft_data_init - parse nf_tables data netlink attributes
7211 * @ctx: context of the expression using the data
7212 * @data: destination struct nft_data
7213 * @size: maximum data length
7214 * @desc: data description
7215 * @nla: netlink attribute containing data
7217 * Parse the netlink data attributes and initialize a struct nft_data.
7218 * The type and length of data are returned in the data description.
7220 * The caller can indicate that it only wants to accept data of type
7221 * NFT_DATA_VALUE by passing NULL for the ctx argument.
7223 int nft_data_init(const struct nft_ctx *ctx,
7224 struct nft_data *data, unsigned int size,
7225 struct nft_data_desc *desc, const struct nlattr *nla)
7227 struct nlattr *tb[NFTA_DATA_MAX + 1];
7230 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
7234 if (tb[NFTA_DATA_VALUE])
7235 return nft_value_init(ctx, data, size, desc,
7236 tb[NFTA_DATA_VALUE]);
7237 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
7238 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
7241 EXPORT_SYMBOL_GPL(nft_data_init);
7244 * nft_data_release - release a nft_data item
7246 * @data: struct nft_data to release
7247 * @type: type of data
7249 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7250 * all others need to be released by calling this function.
7252 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
7254 if (type < NFT_DATA_VERDICT)
7257 case NFT_DATA_VERDICT:
7258 return nft_verdict_uninit(data);
7263 EXPORT_SYMBOL_GPL(nft_data_release);
7265 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
7266 enum nft_data_types type, unsigned int len)
7268 struct nlattr *nest;
7271 nest = nla_nest_start(skb, attr);
7276 case NFT_DATA_VALUE:
7277 err = nft_value_dump(skb, data, len);
7279 case NFT_DATA_VERDICT:
7280 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
7287 nla_nest_end(skb, nest);
7290 EXPORT_SYMBOL_GPL(nft_data_dump);
7292 int __nft_release_basechain(struct nft_ctx *ctx)
7294 struct nft_rule *rule, *nr;
7296 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
7299 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
7300 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
7301 list_del(&rule->list);
7303 nf_tables_rule_release(ctx, rule);
7305 nft_chain_del(ctx->chain);
7307 nf_tables_chain_destroy(ctx);
7311 EXPORT_SYMBOL_GPL(__nft_release_basechain);
7313 static void __nft_release_tables(struct net *net)
7315 struct nft_flowtable *flowtable, *nf;
7316 struct nft_table *table, *nt;
7317 struct nft_chain *chain, *nc;
7318 struct nft_object *obj, *ne;
7319 struct nft_rule *rule, *nr;
7320 struct nft_set *set, *ns;
7321 struct nft_ctx ctx = {
7323 .family = NFPROTO_NETDEV,
7326 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
7327 ctx.family = table->family;
7329 list_for_each_entry(chain, &table->chains, list)
7330 nf_tables_unregister_hook(net, table, chain);
7331 /* No packets are walking on these chains anymore. */
7333 list_for_each_entry(chain, &table->chains, list) {
7335 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
7336 list_del(&rule->list);
7338 nf_tables_rule_release(&ctx, rule);
7341 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
7342 list_del(&flowtable->list);
7344 nf_tables_flowtable_destroy(flowtable);
7346 list_for_each_entry_safe(set, ns, &table->sets, list) {
7347 list_del(&set->list);
7349 nft_set_destroy(set);
7351 list_for_each_entry_safe(obj, ne, &table->objects, list) {
7352 list_del(&obj->list);
7354 nft_obj_destroy(&ctx, obj);
7356 list_for_each_entry_safe(chain, nc, &table->chains, list) {
7358 nft_chain_del(chain);
7360 nf_tables_chain_destroy(&ctx);
7362 list_del(&table->list);
7363 nf_tables_table_destroy(&ctx);
7367 static int __net_init nf_tables_init_net(struct net *net)
7369 INIT_LIST_HEAD(&net->nft.tables);
7370 INIT_LIST_HEAD(&net->nft.commit_list);
7371 mutex_init(&net->nft.commit_mutex);
7372 net->nft.base_seq = 1;
7373 net->nft.validate_state = NFT_VALIDATE_SKIP;
7378 static void __net_exit nf_tables_exit_net(struct net *net)
7380 mutex_lock(&net->nft.commit_mutex);
7381 if (!list_empty(&net->nft.commit_list))
7382 __nf_tables_abort(net);
7383 __nft_release_tables(net);
7384 mutex_unlock(&net->nft.commit_mutex);
7385 WARN_ON_ONCE(!list_empty(&net->nft.tables));
7388 static struct pernet_operations nf_tables_net_ops = {
7389 .init = nf_tables_init_net,
7390 .exit = nf_tables_exit_net,
7393 static int __init nf_tables_module_init(void)
7397 err = register_pernet_subsys(&nf_tables_net_ops);
7401 err = nft_chain_filter_init();
7405 err = nf_tables_core_module_init();
7409 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
7414 err = nfnetlink_subsys_register(&nf_tables_subsys);
7420 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7422 nf_tables_core_module_exit();
7424 nft_chain_filter_fini();
7426 unregister_pernet_subsys(&nf_tables_net_ops);
7430 static void __exit nf_tables_module_exit(void)
7432 nfnetlink_subsys_unregister(&nf_tables_subsys);
7433 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7434 nft_chain_filter_fini();
7435 unregister_pernet_subsys(&nf_tables_net_ops);
7437 nf_tables_core_module_exit();
7440 module_init(nf_tables_module_init);
7441 module_exit(nf_tables_module_exit);
7443 MODULE_LICENSE("GPL");
7444 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
7445 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);