1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
5 * Development of this code funded by Astaro AG (http://www.astaro.com/)
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/list.h>
11 #include <linux/skbuff.h>
12 #include <linux/netlink.h>
13 #include <linux/vmalloc.h>
14 #include <linux/rhashtable.h>
15 #include <linux/netfilter.h>
16 #include <linux/netfilter/nfnetlink.h>
17 #include <linux/netfilter/nf_tables.h>
18 #include <net/netfilter/nf_flow_table.h>
19 #include <net/netfilter/nf_tables_core.h>
20 #include <net/netfilter/nf_tables.h>
21 #include <net/netfilter/nf_tables_offload.h>
22 #include <net/net_namespace.h>
25 static LIST_HEAD(nf_tables_expressions);
26 static LIST_HEAD(nf_tables_objects);
27 static LIST_HEAD(nf_tables_flowtables);
28 static LIST_HEAD(nf_tables_destroy_list);
29 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
30 static u64 table_handle;
33 NFT_VALIDATE_SKIP = 0,
38 static struct rhltable nft_objname_ht;
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 u32 nft_objname_hash(const void *data, u32 len, u32 seed);
45 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
46 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
48 static const struct rhashtable_params nft_chain_ht_params = {
49 .head_offset = offsetof(struct nft_chain, rhlhead),
50 .key_offset = offsetof(struct nft_chain, name),
51 .hashfn = nft_chain_hash,
52 .obj_hashfn = nft_chain_hash_obj,
53 .obj_cmpfn = nft_chain_hash_cmp,
54 .automatic_shrinking = true,
57 static const struct rhashtable_params nft_objname_ht_params = {
58 .head_offset = offsetof(struct nft_object, rhlhead),
59 .key_offset = offsetof(struct nft_object, key),
60 .hashfn = nft_objname_hash,
61 .obj_hashfn = nft_objname_hash_obj,
62 .obj_cmpfn = nft_objname_hash_cmp,
63 .automatic_shrinking = true,
66 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
68 switch (net->nft.validate_state) {
69 case NFT_VALIDATE_SKIP:
70 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
72 case NFT_VALIDATE_NEED:
75 if (new_validate_state == NFT_VALIDATE_NEED)
79 net->nft.validate_state = new_validate_state;
81 static void nf_tables_trans_destroy_work(struct work_struct *w);
82 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
84 static void nft_ctx_init(struct nft_ctx *ctx,
86 const struct sk_buff *skb,
87 const struct nlmsghdr *nlh,
89 struct nft_table *table,
90 struct nft_chain *chain,
91 const struct nlattr * const *nla)
99 ctx->portid = NETLINK_CB(skb).portid;
100 ctx->report = nlmsg_report(nlh);
101 ctx->flags = nlh->nlmsg_flags;
102 ctx->seq = nlh->nlmsg_seq;
105 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
106 int msg_type, u32 size, gfp_t gfp)
108 struct nft_trans *trans;
110 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
114 trans->msg_type = msg_type;
120 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
121 int msg_type, u32 size)
123 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
126 static void nft_trans_destroy(struct nft_trans *trans)
128 list_del(&trans->list);
132 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
134 struct net *net = ctx->net;
135 struct nft_trans *trans;
137 if (!nft_set_is_anonymous(set))
140 list_for_each_entry_reverse(trans, &net->nft.commit_list, list) {
141 if (trans->msg_type == NFT_MSG_NEWSET &&
142 nft_trans_set(trans) == set) {
149 static int nf_tables_register_hook(struct net *net,
150 const struct nft_table *table,
151 struct nft_chain *chain)
153 const struct nft_base_chain *basechain;
154 const struct nf_hook_ops *ops;
156 if (table->flags & NFT_TABLE_F_DORMANT ||
157 !nft_is_base_chain(chain))
160 basechain = nft_base_chain(chain);
161 ops = &basechain->ops;
163 if (basechain->type->ops_register)
164 return basechain->type->ops_register(net, ops);
166 return nf_register_net_hook(net, ops);
169 static void nf_tables_unregister_hook(struct net *net,
170 const struct nft_table *table,
171 struct nft_chain *chain)
173 const struct nft_base_chain *basechain;
174 const struct nf_hook_ops *ops;
176 if (table->flags & NFT_TABLE_F_DORMANT ||
177 !nft_is_base_chain(chain))
179 basechain = nft_base_chain(chain);
180 ops = &basechain->ops;
182 if (basechain->type->ops_unregister)
183 return basechain->type->ops_unregister(net, ops);
185 nf_unregister_net_hook(net, ops);
188 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
190 struct nft_trans *trans;
192 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
196 if (msg_type == NFT_MSG_NEWTABLE)
197 nft_activate_next(ctx->net, ctx->table);
199 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
203 static int nft_deltable(struct nft_ctx *ctx)
207 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
211 nft_deactivate_next(ctx->net, ctx->table);
215 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
217 struct nft_trans *trans;
219 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
221 return ERR_PTR(-ENOMEM);
223 if (msg_type == NFT_MSG_NEWCHAIN)
224 nft_activate_next(ctx->net, ctx->chain);
226 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
230 static int nft_delchain(struct nft_ctx *ctx)
232 struct nft_trans *trans;
234 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
236 return PTR_ERR(trans);
239 nft_deactivate_next(ctx->net, ctx->chain);
244 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
245 struct nft_rule *rule)
247 struct nft_expr *expr;
249 expr = nft_expr_first(rule);
250 while (expr != nft_expr_last(rule) && expr->ops) {
251 if (expr->ops->activate)
252 expr->ops->activate(ctx, expr);
254 expr = nft_expr_next(expr);
258 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
259 struct nft_rule *rule,
260 enum nft_trans_phase phase)
262 struct nft_expr *expr;
264 expr = nft_expr_first(rule);
265 while (expr != nft_expr_last(rule) && expr->ops) {
266 if (expr->ops->deactivate)
267 expr->ops->deactivate(ctx, expr, phase);
269 expr = nft_expr_next(expr);
274 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
276 /* You cannot delete the same rule twice */
277 if (nft_is_active_next(ctx->net, rule)) {
278 nft_deactivate_next(ctx->net, rule);
285 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
286 struct nft_rule *rule)
288 struct nft_trans *trans;
290 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
294 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
295 nft_trans_rule_id(trans) =
296 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
298 nft_trans_rule(trans) = rule;
299 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
304 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
306 struct nft_trans *trans;
309 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
313 err = nf_tables_delrule_deactivate(ctx, rule);
315 nft_trans_destroy(trans);
318 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
323 static int nft_delrule_by_chain(struct nft_ctx *ctx)
325 struct nft_rule *rule;
328 list_for_each_entry(rule, &ctx->chain->rules, list) {
329 if (!nft_is_active_next(ctx->net, rule))
332 err = nft_delrule(ctx, rule);
339 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
342 struct nft_trans *trans;
344 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
348 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
349 nft_trans_set_id(trans) =
350 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
351 nft_activate_next(ctx->net, set);
353 nft_trans_set(trans) = set;
354 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
359 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
363 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
367 nft_deactivate_next(ctx->net, set);
373 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
374 struct nft_object *obj)
376 struct nft_trans *trans;
378 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
382 if (msg_type == NFT_MSG_NEWOBJ)
383 nft_activate_next(ctx->net, obj);
385 nft_trans_obj(trans) = obj;
386 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
391 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
395 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
399 nft_deactivate_next(ctx->net, obj);
405 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
406 struct nft_flowtable *flowtable)
408 struct nft_trans *trans;
410 trans = nft_trans_alloc(ctx, msg_type,
411 sizeof(struct nft_trans_flowtable));
415 if (msg_type == NFT_MSG_NEWFLOWTABLE)
416 nft_activate_next(ctx->net, flowtable);
418 nft_trans_flowtable(trans) = flowtable;
419 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
424 static int nft_delflowtable(struct nft_ctx *ctx,
425 struct nft_flowtable *flowtable)
429 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
433 nft_deactivate_next(ctx->net, flowtable);
443 static struct nft_table *nft_table_lookup(const struct net *net,
444 const struct nlattr *nla,
445 u8 family, u8 genmask)
447 struct nft_table *table;
450 return ERR_PTR(-EINVAL);
452 list_for_each_entry_rcu(table, &net->nft.tables, list) {
453 if (!nla_strcmp(nla, table->name) &&
454 table->family == family &&
455 nft_active_genmask(table, genmask))
459 return ERR_PTR(-ENOENT);
462 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
463 const struct nlattr *nla,
466 struct nft_table *table;
468 list_for_each_entry(table, &net->nft.tables, list) {
469 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
470 nft_active_genmask(table, genmask))
474 return ERR_PTR(-ENOENT);
477 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
479 return ++table->hgenerator;
482 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
484 static const struct nft_chain_type *
485 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
489 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
490 if (chain_type[family][i] != NULL &&
491 !nla_strcmp(nla, chain_type[family][i]->name))
492 return chain_type[family][i];
498 * Loading a module requires dropping mutex that guards the
500 * We first need to abort any pending transactions as once
501 * mutex is unlocked a different client could start a new
502 * transaction. It must not see any 'future generation'
503 * changes * as these changes will never happen.
505 #ifdef CONFIG_MODULES
506 static int __nf_tables_abort(struct net *net);
508 static void nft_request_module(struct net *net, const char *fmt, ...)
510 char module_name[MODULE_NAME_LEN];
514 __nf_tables_abort(net);
517 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
519 if (WARN(ret >= MODULE_NAME_LEN, "truncated: '%s' (len %d)", module_name, ret))
522 mutex_unlock(&net->nft.commit_mutex);
523 request_module("%s", module_name);
524 mutex_lock(&net->nft.commit_mutex);
528 static void lockdep_nfnl_nft_mutex_not_held(void)
530 #ifdef CONFIG_PROVE_LOCKING
531 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
535 static const struct nft_chain_type *
536 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
537 u8 family, bool autoload)
539 const struct nft_chain_type *type;
541 type = __nf_tables_chain_type_lookup(nla, family);
545 lockdep_nfnl_nft_mutex_not_held();
546 #ifdef CONFIG_MODULES
548 nft_request_module(net, "nft-chain-%u-%.*s", family,
549 nla_len(nla), (const char *)nla_data(nla));
550 type = __nf_tables_chain_type_lookup(nla, family);
552 return ERR_PTR(-EAGAIN);
555 return ERR_PTR(-ENOENT);
558 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
559 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
560 .len = NFT_TABLE_MAXNAMELEN - 1 },
561 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
562 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
565 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
566 u32 portid, u32 seq, int event, u32 flags,
567 int family, const struct nft_table *table)
569 struct nlmsghdr *nlh;
570 struct nfgenmsg *nfmsg;
572 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
573 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
575 goto nla_put_failure;
577 nfmsg = nlmsg_data(nlh);
578 nfmsg->nfgen_family = family;
579 nfmsg->version = NFNETLINK_V0;
580 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
582 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
583 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
584 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
585 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
587 goto nla_put_failure;
593 nlmsg_trim(skb, nlh);
597 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
603 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
606 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
610 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
611 event, 0, ctx->family, ctx->table);
617 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
618 ctx->report, GFP_KERNEL);
621 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
624 static int nf_tables_dump_tables(struct sk_buff *skb,
625 struct netlink_callback *cb)
627 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
628 const struct nft_table *table;
629 unsigned int idx = 0, s_idx = cb->args[0];
630 struct net *net = sock_net(skb->sk);
631 int family = nfmsg->nfgen_family;
634 cb->seq = net->nft.base_seq;
636 list_for_each_entry_rcu(table, &net->nft.tables, list) {
637 if (family != NFPROTO_UNSPEC && family != table->family)
643 memset(&cb->args[1], 0,
644 sizeof(cb->args) - sizeof(cb->args[0]));
645 if (!nft_is_active(net, table))
647 if (nf_tables_fill_table_info(skb, net,
648 NETLINK_CB(cb->skb).portid,
650 NFT_MSG_NEWTABLE, NLM_F_MULTI,
651 table->family, table) < 0)
654 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
664 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
665 const struct nlmsghdr *nlh,
666 struct netlink_dump_control *c)
670 if (!try_module_get(THIS_MODULE))
674 err = netlink_dump_start(nlsk, skb, nlh, c);
676 module_put(THIS_MODULE);
681 /* called with rcu_read_lock held */
682 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
683 struct sk_buff *skb, const struct nlmsghdr *nlh,
684 const struct nlattr * const nla[],
685 struct netlink_ext_ack *extack)
687 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
688 u8 genmask = nft_genmask_cur(net);
689 const struct nft_table *table;
690 struct sk_buff *skb2;
691 int family = nfmsg->nfgen_family;
694 if (nlh->nlmsg_flags & NLM_F_DUMP) {
695 struct netlink_dump_control c = {
696 .dump = nf_tables_dump_tables,
697 .module = THIS_MODULE,
700 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
703 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
705 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
706 return PTR_ERR(table);
709 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
713 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
714 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
719 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
726 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
728 struct nft_chain *chain;
731 list_for_each_entry(chain, &table->chains, list) {
732 if (!nft_is_active_next(net, chain))
734 if (!nft_is_base_chain(chain))
737 if (cnt && i++ == cnt)
740 nf_unregister_net_hook(net, &nft_base_chain(chain)->ops);
744 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
746 struct nft_chain *chain;
749 list_for_each_entry(chain, &table->chains, list) {
750 if (!nft_is_active_next(net, chain))
752 if (!nft_is_base_chain(chain))
755 err = nf_register_net_hook(net, &nft_base_chain(chain)->ops);
764 nft_table_disable(net, table, i);
768 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
770 nft_table_disable(net, table, 0);
773 static int nf_tables_updtable(struct nft_ctx *ctx)
775 struct nft_trans *trans;
779 if (!ctx->nla[NFTA_TABLE_FLAGS])
782 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
783 if (flags & ~NFT_TABLE_F_DORMANT)
786 if (flags == ctx->table->flags)
789 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
790 sizeof(struct nft_trans_table));
794 if ((flags & NFT_TABLE_F_DORMANT) &&
795 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
796 nft_trans_table_enable(trans) = false;
797 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
798 ctx->table->flags & NFT_TABLE_F_DORMANT) {
799 ret = nf_tables_table_enable(ctx->net, ctx->table);
801 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
802 nft_trans_table_enable(trans) = true;
808 nft_trans_table_update(trans) = true;
809 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
812 nft_trans_destroy(trans);
816 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
818 const char *name = data;
820 return jhash(name, strlen(name), seed);
823 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
825 const struct nft_chain *chain = data;
827 return nft_chain_hash(chain->name, 0, seed);
830 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
833 const struct nft_chain *chain = ptr;
834 const char *name = arg->key;
836 return strcmp(chain->name, name);
839 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
841 const struct nft_object_hash_key *k = data;
843 seed ^= hash_ptr(k->table, 32);
845 return jhash(k->name, strlen(k->name), seed);
848 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
850 const struct nft_object *obj = data;
852 return nft_objname_hash(&obj->key, 0, seed);
855 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
858 const struct nft_object_hash_key *k = arg->key;
859 const struct nft_object *obj = ptr;
861 if (obj->key.table != k->table)
864 return strcmp(obj->key.name, k->name);
867 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
868 struct sk_buff *skb, const struct nlmsghdr *nlh,
869 const struct nlattr * const nla[],
870 struct netlink_ext_ack *extack)
872 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
873 u8 genmask = nft_genmask_next(net);
874 int family = nfmsg->nfgen_family;
875 const struct nlattr *attr;
876 struct nft_table *table;
881 lockdep_assert_held(&net->nft.commit_mutex);
882 attr = nla[NFTA_TABLE_NAME];
883 table = nft_table_lookup(net, attr, family, genmask);
885 if (PTR_ERR(table) != -ENOENT)
886 return PTR_ERR(table);
888 if (nlh->nlmsg_flags & NLM_F_EXCL) {
889 NL_SET_BAD_ATTR(extack, attr);
892 if (nlh->nlmsg_flags & NLM_F_REPLACE)
895 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
896 return nf_tables_updtable(&ctx);
899 if (nla[NFTA_TABLE_FLAGS]) {
900 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
901 if (flags & ~NFT_TABLE_F_DORMANT)
906 table = kzalloc(sizeof(*table), GFP_KERNEL);
910 table->name = nla_strdup(attr, GFP_KERNEL);
911 if (table->name == NULL)
914 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
918 INIT_LIST_HEAD(&table->chains);
919 INIT_LIST_HEAD(&table->sets);
920 INIT_LIST_HEAD(&table->objects);
921 INIT_LIST_HEAD(&table->flowtables);
922 table->family = family;
923 table->flags = flags;
924 table->handle = ++table_handle;
926 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
927 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
931 list_add_tail_rcu(&table->list, &net->nft.tables);
934 rhltable_destroy(&table->chains_ht);
943 static int nft_flush_table(struct nft_ctx *ctx)
945 struct nft_flowtable *flowtable, *nft;
946 struct nft_chain *chain, *nc;
947 struct nft_object *obj, *ne;
948 struct nft_set *set, *ns;
951 list_for_each_entry(chain, &ctx->table->chains, list) {
952 if (!nft_is_active_next(ctx->net, chain))
957 err = nft_delrule_by_chain(ctx);
962 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
963 if (!nft_is_active_next(ctx->net, set))
966 if (nft_set_is_anonymous(set) &&
967 !list_empty(&set->bindings))
970 err = nft_delset(ctx, set);
975 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
976 err = nft_delflowtable(ctx, flowtable);
981 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
982 err = nft_delobj(ctx, obj);
987 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
988 if (!nft_is_active_next(ctx->net, chain))
993 err = nft_delchain(ctx);
998 err = nft_deltable(ctx);
1003 static int nft_flush(struct nft_ctx *ctx, int family)
1005 struct nft_table *table, *nt;
1006 const struct nlattr * const *nla = ctx->nla;
1009 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
1010 if (family != AF_UNSPEC && table->family != family)
1013 ctx->family = table->family;
1015 if (!nft_is_active_next(ctx->net, table))
1018 if (nla[NFTA_TABLE_NAME] &&
1019 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1024 err = nft_flush_table(ctx);
1032 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1033 struct sk_buff *skb, const struct nlmsghdr *nlh,
1034 const struct nlattr * const nla[],
1035 struct netlink_ext_ack *extack)
1037 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1038 u8 genmask = nft_genmask_next(net);
1039 int family = nfmsg->nfgen_family;
1040 const struct nlattr *attr;
1041 struct nft_table *table;
1044 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
1045 if (family == AF_UNSPEC ||
1046 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1047 return nft_flush(&ctx, family);
1049 if (nla[NFTA_TABLE_HANDLE]) {
1050 attr = nla[NFTA_TABLE_HANDLE];
1051 table = nft_table_lookup_byhandle(net, attr, genmask);
1053 attr = nla[NFTA_TABLE_NAME];
1054 table = nft_table_lookup(net, attr, family, genmask);
1057 if (IS_ERR(table)) {
1058 NL_SET_BAD_ATTR(extack, attr);
1059 return PTR_ERR(table);
1062 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1066 ctx.family = family;
1069 return nft_flush_table(&ctx);
1072 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1074 if (WARN_ON(ctx->table->use > 0))
1077 rhltable_destroy(&ctx->table->chains_ht);
1078 kfree(ctx->table->name);
1082 void nft_register_chain_type(const struct nft_chain_type *ctype)
1084 if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO))
1087 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1088 if (WARN_ON(chain_type[ctype->family][ctype->type] != NULL)) {
1089 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1092 chain_type[ctype->family][ctype->type] = ctype;
1093 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1095 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1097 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1099 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1100 chain_type[ctype->family][ctype->type] = NULL;
1101 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1103 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1109 static struct nft_chain *
1110 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1112 struct nft_chain *chain;
1114 list_for_each_entry(chain, &table->chains, list) {
1115 if (chain->handle == handle &&
1116 nft_active_genmask(chain, genmask))
1120 return ERR_PTR(-ENOENT);
1123 static bool lockdep_commit_lock_is_held(const struct net *net)
1125 #ifdef CONFIG_PROVE_LOCKING
1126 return lockdep_is_held(&net->nft.commit_mutex);
1132 static struct nft_chain *nft_chain_lookup(struct net *net,
1133 struct nft_table *table,
1134 const struct nlattr *nla, u8 genmask)
1136 char search[NFT_CHAIN_MAXNAMELEN + 1];
1137 struct rhlist_head *tmp, *list;
1138 struct nft_chain *chain;
1141 return ERR_PTR(-EINVAL);
1143 nla_strlcpy(search, nla, sizeof(search));
1145 WARN_ON(!rcu_read_lock_held() &&
1146 !lockdep_commit_lock_is_held(net));
1148 chain = ERR_PTR(-ENOENT);
1150 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1154 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1155 if (nft_active_genmask(chain, genmask))
1158 chain = ERR_PTR(-ENOENT);
1164 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1165 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1166 .len = NFT_TABLE_MAXNAMELEN - 1 },
1167 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1168 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1169 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1170 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1171 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1172 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
1173 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1174 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1177 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1178 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1179 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1180 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1181 .len = IFNAMSIZ - 1 },
1184 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1186 struct nft_stats *cpu_stats, total;
1187 struct nlattr *nest;
1195 memset(&total, 0, sizeof(total));
1196 for_each_possible_cpu(cpu) {
1197 cpu_stats = per_cpu_ptr(stats, cpu);
1199 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1200 pkts = cpu_stats->pkts;
1201 bytes = cpu_stats->bytes;
1202 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1204 total.bytes += bytes;
1206 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1208 goto nla_put_failure;
1210 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1211 NFTA_COUNTER_PAD) ||
1212 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1214 goto nla_put_failure;
1216 nla_nest_end(skb, nest);
1223 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1224 u32 portid, u32 seq, int event, u32 flags,
1225 int family, const struct nft_table *table,
1226 const struct nft_chain *chain)
1228 struct nlmsghdr *nlh;
1229 struct nfgenmsg *nfmsg;
1231 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1232 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1234 goto nla_put_failure;
1236 nfmsg = nlmsg_data(nlh);
1237 nfmsg->nfgen_family = family;
1238 nfmsg->version = NFNETLINK_V0;
1239 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1241 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1242 goto nla_put_failure;
1243 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1245 goto nla_put_failure;
1246 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1247 goto nla_put_failure;
1249 if (nft_is_base_chain(chain)) {
1250 const struct nft_base_chain *basechain = nft_base_chain(chain);
1251 const struct nf_hook_ops *ops = &basechain->ops;
1252 struct nft_stats __percpu *stats;
1253 struct nlattr *nest;
1255 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1257 goto nla_put_failure;
1258 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1259 goto nla_put_failure;
1260 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1261 goto nla_put_failure;
1262 if (basechain->dev_name[0] &&
1263 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1264 goto nla_put_failure;
1265 nla_nest_end(skb, nest);
1267 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1268 htonl(basechain->policy)))
1269 goto nla_put_failure;
1271 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1272 goto nla_put_failure;
1274 stats = rcu_dereference_check(basechain->stats,
1275 lockdep_commit_lock_is_held(net));
1276 if (nft_dump_stats(skb, stats))
1277 goto nla_put_failure;
1280 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1281 goto nla_put_failure;
1283 nlmsg_end(skb, nlh);
1287 nlmsg_trim(skb, nlh);
1291 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1293 struct sk_buff *skb;
1297 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1300 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1304 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1305 event, 0, ctx->family, ctx->table,
1312 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1313 ctx->report, GFP_KERNEL);
1316 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1319 static int nf_tables_dump_chains(struct sk_buff *skb,
1320 struct netlink_callback *cb)
1322 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1323 const struct nft_table *table;
1324 const struct nft_chain *chain;
1325 unsigned int idx = 0, s_idx = cb->args[0];
1326 struct net *net = sock_net(skb->sk);
1327 int family = nfmsg->nfgen_family;
1330 cb->seq = net->nft.base_seq;
1332 list_for_each_entry_rcu(table, &net->nft.tables, list) {
1333 if (family != NFPROTO_UNSPEC && family != table->family)
1336 list_for_each_entry_rcu(chain, &table->chains, list) {
1340 memset(&cb->args[1], 0,
1341 sizeof(cb->args) - sizeof(cb->args[0]));
1342 if (!nft_is_active(net, chain))
1344 if (nf_tables_fill_chain_info(skb, net,
1345 NETLINK_CB(cb->skb).portid,
1349 table->family, table,
1353 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1364 /* called with rcu_read_lock held */
1365 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1366 struct sk_buff *skb, const struct nlmsghdr *nlh,
1367 const struct nlattr * const nla[],
1368 struct netlink_ext_ack *extack)
1370 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1371 u8 genmask = nft_genmask_cur(net);
1372 const struct nft_chain *chain;
1373 struct nft_table *table;
1374 struct sk_buff *skb2;
1375 int family = nfmsg->nfgen_family;
1378 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1379 struct netlink_dump_control c = {
1380 .dump = nf_tables_dump_chains,
1381 .module = THIS_MODULE,
1384 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1387 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1388 if (IS_ERR(table)) {
1389 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1390 return PTR_ERR(table);
1393 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1394 if (IS_ERR(chain)) {
1395 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1396 return PTR_ERR(chain);
1399 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1403 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1404 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1405 family, table, chain);
1409 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1416 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1417 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1418 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1421 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1423 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1424 struct nft_stats __percpu *newstats;
1425 struct nft_stats *stats;
1428 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1429 nft_counter_policy, NULL);
1431 return ERR_PTR(err);
1433 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1434 return ERR_PTR(-EINVAL);
1436 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1437 if (newstats == NULL)
1438 return ERR_PTR(-ENOMEM);
1440 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1441 * are not exposed to userspace.
1444 stats = this_cpu_ptr(newstats);
1445 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1446 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1452 static void nft_chain_stats_replace(struct nft_trans *trans)
1454 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1456 if (!nft_trans_chain_stats(trans))
1459 rcu_swap_protected(chain->stats, nft_trans_chain_stats(trans),
1460 lockdep_commit_lock_is_held(trans->ctx.net));
1462 if (!nft_trans_chain_stats(trans))
1463 static_branch_inc(&nft_counters_enabled);
1466 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1468 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1469 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1475 /* should be NULL either via abort or via successful commit */
1476 WARN_ON_ONCE(chain->rules_next);
1477 kvfree(chain->rules_next);
1480 static void nf_tables_chain_destroy(struct nft_ctx *ctx)
1482 struct nft_chain *chain = ctx->chain;
1484 if (WARN_ON(chain->use > 0))
1487 /* no concurrent access possible anymore */
1488 nf_tables_chain_free_chain_rules(chain);
1490 if (nft_is_base_chain(chain)) {
1491 struct nft_base_chain *basechain = nft_base_chain(chain);
1493 module_put(basechain->type->owner);
1494 if (rcu_access_pointer(basechain->stats)) {
1495 static_branch_dec(&nft_counters_enabled);
1496 free_percpu(rcu_dereference_raw(basechain->stats));
1506 struct nft_chain_hook {
1509 const struct nft_chain_type *type;
1510 struct net_device *dev;
1513 static int nft_chain_parse_hook(struct net *net,
1514 const struct nlattr * const nla[],
1515 struct nft_chain_hook *hook, u8 family,
1518 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1519 const struct nft_chain_type *type;
1520 struct net_device *dev;
1523 lockdep_assert_held(&net->nft.commit_mutex);
1524 lockdep_nfnl_nft_mutex_not_held();
1526 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1527 nla[NFTA_CHAIN_HOOK],
1528 nft_hook_policy, NULL);
1532 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1533 ha[NFTA_HOOK_PRIORITY] == NULL)
1536 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1537 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1539 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1540 if (nla[NFTA_CHAIN_TYPE]) {
1541 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1544 return PTR_ERR(type);
1546 if (hook->num > NF_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1549 if (type->type == NFT_CHAIN_T_NAT &&
1550 hook->priority <= NF_IP_PRI_CONNTRACK)
1553 if (!try_module_get(type->owner))
1559 if (family == NFPROTO_NETDEV) {
1560 char ifname[IFNAMSIZ];
1562 if (!ha[NFTA_HOOK_DEV]) {
1563 module_put(type->owner);
1567 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1568 dev = __dev_get_by_name(net, ifname);
1570 module_put(type->owner);
1574 } else if (ha[NFTA_HOOK_DEV]) {
1575 module_put(type->owner);
1582 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1584 module_put(hook->type->owner);
1587 struct nft_rules_old {
1589 struct nft_rule **start;
1592 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1595 if (alloc > INT_MAX)
1598 alloc += 1; /* NULL, ends rules */
1599 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1602 alloc *= sizeof(struct nft_rule *);
1603 alloc += sizeof(struct nft_rules_old);
1605 return kvmalloc(alloc, GFP_KERNEL);
1608 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1609 u8 policy, u32 flags)
1611 const struct nlattr * const *nla = ctx->nla;
1612 struct nft_table *table = ctx->table;
1613 struct nft_base_chain *basechain;
1614 struct nft_stats __percpu *stats;
1615 struct net *net = ctx->net;
1616 struct nft_trans *trans;
1617 struct nft_chain *chain;
1618 struct nft_rule **rules;
1621 if (table->use == UINT_MAX)
1624 if (nla[NFTA_CHAIN_HOOK]) {
1625 struct nft_chain_hook hook;
1626 struct nf_hook_ops *ops;
1628 err = nft_chain_parse_hook(net, nla, &hook, family, true);
1632 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1633 if (basechain == NULL) {
1634 nft_chain_release_hook(&hook);
1638 if (hook.dev != NULL)
1639 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1641 if (nla[NFTA_CHAIN_COUNTERS]) {
1642 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1643 if (IS_ERR(stats)) {
1644 nft_chain_release_hook(&hook);
1646 return PTR_ERR(stats);
1648 rcu_assign_pointer(basechain->stats, stats);
1649 static_branch_inc(&nft_counters_enabled);
1652 basechain->type = hook.type;
1653 chain = &basechain->chain;
1655 ops = &basechain->ops;
1657 ops->hooknum = hook.num;
1658 ops->priority = hook.priority;
1660 ops->hook = hook.type->hooks[ops->hooknum];
1661 ops->dev = hook.dev;
1663 chain->flags |= NFT_BASE_CHAIN | flags;
1664 basechain->policy = NF_ACCEPT;
1665 INIT_LIST_HEAD(&basechain->cb_list);
1667 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1673 INIT_LIST_HEAD(&chain->rules);
1674 chain->handle = nf_tables_alloc_handle(table);
1675 chain->table = table;
1676 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1682 rules = nf_tables_chain_alloc_rules(chain, 0);
1689 rcu_assign_pointer(chain->rules_gen_0, rules);
1690 rcu_assign_pointer(chain->rules_gen_1, rules);
1692 err = nf_tables_register_hook(net, table, chain);
1696 err = rhltable_insert_key(&table->chains_ht, chain->name,
1697 &chain->rhlhead, nft_chain_ht_params);
1701 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1702 if (IS_ERR(trans)) {
1703 err = PTR_ERR(trans);
1704 rhltable_remove(&table->chains_ht, &chain->rhlhead,
1705 nft_chain_ht_params);
1709 nft_trans_chain_policy(trans) = -1;
1710 if (nft_is_base_chain(chain))
1711 nft_trans_chain_policy(trans) = policy;
1714 list_add_tail_rcu(&chain->list, &table->chains);
1718 nf_tables_unregister_hook(net, table, chain);
1720 nf_tables_chain_destroy(ctx);
1725 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
1728 const struct nlattr * const *nla = ctx->nla;
1729 struct nft_table *table = ctx->table;
1730 struct nft_chain *chain = ctx->chain;
1731 struct nft_base_chain *basechain;
1732 struct nft_stats *stats = NULL;
1733 struct nft_chain_hook hook;
1734 struct nf_hook_ops *ops;
1735 struct nft_trans *trans;
1738 if (chain->flags ^ flags)
1741 if (nla[NFTA_CHAIN_HOOK]) {
1742 if (!nft_is_base_chain(chain))
1745 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
1750 basechain = nft_base_chain(chain);
1751 if (basechain->type != hook.type) {
1752 nft_chain_release_hook(&hook);
1756 ops = &basechain->ops;
1757 if (ops->hooknum != hook.num ||
1758 ops->priority != hook.priority ||
1759 ops->dev != hook.dev) {
1760 nft_chain_release_hook(&hook);
1763 nft_chain_release_hook(&hook);
1766 if (nla[NFTA_CHAIN_HANDLE] &&
1767 nla[NFTA_CHAIN_NAME]) {
1768 struct nft_chain *chain2;
1770 chain2 = nft_chain_lookup(ctx->net, table,
1771 nla[NFTA_CHAIN_NAME], genmask);
1772 if (!IS_ERR(chain2))
1776 if (nla[NFTA_CHAIN_COUNTERS]) {
1777 if (!nft_is_base_chain(chain))
1780 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1782 return PTR_ERR(stats);
1786 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
1787 sizeof(struct nft_trans_chain));
1791 nft_trans_chain_stats(trans) = stats;
1792 nft_trans_chain_update(trans) = true;
1794 if (nla[NFTA_CHAIN_POLICY])
1795 nft_trans_chain_policy(trans) = policy;
1797 nft_trans_chain_policy(trans) = -1;
1799 if (nla[NFTA_CHAIN_HANDLE] &&
1800 nla[NFTA_CHAIN_NAME]) {
1801 struct nft_trans *tmp;
1805 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1810 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
1811 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
1812 tmp->ctx.table == table &&
1813 nft_trans_chain_update(tmp) &&
1814 nft_trans_chain_name(tmp) &&
1815 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
1821 nft_trans_chain_name(trans) = name;
1823 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1832 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1833 struct sk_buff *skb, const struct nlmsghdr *nlh,
1834 const struct nlattr * const nla[],
1835 struct netlink_ext_ack *extack)
1837 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1838 u8 genmask = nft_genmask_next(net);
1839 int family = nfmsg->nfgen_family;
1840 const struct nlattr *attr;
1841 struct nft_table *table;
1842 struct nft_chain *chain;
1843 u8 policy = NF_ACCEPT;
1848 lockdep_assert_held(&net->nft.commit_mutex);
1850 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1851 if (IS_ERR(table)) {
1852 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1853 return PTR_ERR(table);
1857 attr = nla[NFTA_CHAIN_NAME];
1859 if (nla[NFTA_CHAIN_HANDLE]) {
1860 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1861 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1862 if (IS_ERR(chain)) {
1863 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
1864 return PTR_ERR(chain);
1866 attr = nla[NFTA_CHAIN_HANDLE];
1868 chain = nft_chain_lookup(net, table, attr, genmask);
1869 if (IS_ERR(chain)) {
1870 if (PTR_ERR(chain) != -ENOENT) {
1871 NL_SET_BAD_ATTR(extack, attr);
1872 return PTR_ERR(chain);
1878 if (nla[NFTA_CHAIN_POLICY]) {
1879 if (chain != NULL &&
1880 !nft_is_base_chain(chain)) {
1881 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1885 if (chain == NULL &&
1886 nla[NFTA_CHAIN_HOOK] == NULL) {
1887 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1891 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1901 if (nla[NFTA_CHAIN_FLAGS])
1902 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
1904 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1906 if (chain != NULL) {
1907 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1908 NL_SET_BAD_ATTR(extack, attr);
1911 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1914 return nf_tables_updchain(&ctx, genmask, policy, flags);
1917 return nf_tables_addchain(&ctx, family, genmask, policy, flags);
1920 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1921 struct sk_buff *skb, const struct nlmsghdr *nlh,
1922 const struct nlattr * const nla[],
1923 struct netlink_ext_ack *extack)
1925 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1926 u8 genmask = nft_genmask_next(net);
1927 int family = nfmsg->nfgen_family;
1928 const struct nlattr *attr;
1929 struct nft_table *table;
1930 struct nft_chain *chain;
1931 struct nft_rule *rule;
1937 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1938 if (IS_ERR(table)) {
1939 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1940 return PTR_ERR(table);
1943 if (nla[NFTA_CHAIN_HANDLE]) {
1944 attr = nla[NFTA_CHAIN_HANDLE];
1945 handle = be64_to_cpu(nla_get_be64(attr));
1946 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1948 attr = nla[NFTA_CHAIN_NAME];
1949 chain = nft_chain_lookup(net, table, attr, genmask);
1951 if (IS_ERR(chain)) {
1952 NL_SET_BAD_ATTR(extack, attr);
1953 return PTR_ERR(chain);
1956 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1960 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1963 list_for_each_entry(rule, &chain->rules, list) {
1964 if (!nft_is_active_next(net, rule))
1968 err = nft_delrule(&ctx, rule);
1973 /* There are rules and elements that are still holding references to us,
1974 * we cannot do a recursive removal in this case.
1977 NL_SET_BAD_ATTR(extack, attr);
1981 return nft_delchain(&ctx);
1989 * nft_register_expr - register nf_tables expr type
1992 * Registers the expr type for use with nf_tables. Returns zero on
1993 * success or a negative errno code otherwise.
1995 int nft_register_expr(struct nft_expr_type *type)
1997 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1998 if (type->family == NFPROTO_UNSPEC)
1999 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2001 list_add_rcu(&type->list, &nf_tables_expressions);
2002 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2005 EXPORT_SYMBOL_GPL(nft_register_expr);
2008 * nft_unregister_expr - unregister nf_tables expr type
2011 * Unregisters the expr typefor use with nf_tables.
2013 void nft_unregister_expr(struct nft_expr_type *type)
2015 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2016 list_del_rcu(&type->list);
2017 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2019 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2021 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2024 const struct nft_expr_type *type, *candidate = NULL;
2026 list_for_each_entry(type, &nf_tables_expressions, list) {
2027 if (!nla_strcmp(nla, type->name)) {
2028 if (!type->family && !candidate)
2030 else if (type->family == family)
2037 #ifdef CONFIG_MODULES
2038 static int nft_expr_type_request_module(struct net *net, u8 family,
2041 nft_request_module(net, "nft-expr-%u-%.*s", family,
2042 nla_len(nla), (char *)nla_data(nla));
2043 if (__nft_expr_type_get(family, nla))
2050 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2054 const struct nft_expr_type *type;
2057 return ERR_PTR(-EINVAL);
2059 type = __nft_expr_type_get(family, nla);
2060 if (type != NULL && try_module_get(type->owner))
2063 lockdep_nfnl_nft_mutex_not_held();
2064 #ifdef CONFIG_MODULES
2066 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2067 return ERR_PTR(-EAGAIN);
2069 nft_request_module(net, "nft-expr-%.*s",
2070 nla_len(nla), (char *)nla_data(nla));
2071 if (__nft_expr_type_get(family, nla))
2072 return ERR_PTR(-EAGAIN);
2075 return ERR_PTR(-ENOENT);
2078 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2079 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
2080 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2083 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2084 const struct nft_expr *expr)
2086 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2087 goto nla_put_failure;
2089 if (expr->ops->dump) {
2090 struct nlattr *data = nla_nest_start_noflag(skb,
2093 goto nla_put_failure;
2094 if (expr->ops->dump(skb, expr) < 0)
2095 goto nla_put_failure;
2096 nla_nest_end(skb, data);
2105 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2106 const struct nft_expr *expr)
2108 struct nlattr *nest;
2110 nest = nla_nest_start_noflag(skb, attr);
2112 goto nla_put_failure;
2113 if (nf_tables_fill_expr_info(skb, expr) < 0)
2114 goto nla_put_failure;
2115 nla_nest_end(skb, nest);
2122 struct nft_expr_info {
2123 const struct nft_expr_ops *ops;
2124 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2127 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2128 const struct nlattr *nla,
2129 struct nft_expr_info *info)
2131 const struct nft_expr_type *type;
2132 const struct nft_expr_ops *ops;
2133 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2136 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2137 nft_expr_policy, NULL);
2141 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2143 return PTR_ERR(type);
2145 if (tb[NFTA_EXPR_DATA]) {
2146 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2148 type->policy, NULL);
2152 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2154 if (type->select_ops != NULL) {
2155 ops = type->select_ops(ctx,
2156 (const struct nlattr * const *)info->tb);
2159 #ifdef CONFIG_MODULES
2161 nft_expr_type_request_module(ctx->net,
2163 tb[NFTA_EXPR_NAME]);
2174 module_put(type->owner);
2178 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2179 const struct nft_expr_info *info,
2180 struct nft_expr *expr)
2182 const struct nft_expr_ops *ops = info->ops;
2187 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2198 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2199 struct nft_expr *expr)
2201 const struct nft_expr_type *type = expr->ops->type;
2203 if (expr->ops->destroy)
2204 expr->ops->destroy(ctx, expr);
2205 module_put(type->owner);
2208 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2209 const struct nlattr *nla)
2211 struct nft_expr_info info;
2212 struct nft_expr *expr;
2213 struct module *owner;
2216 err = nf_tables_expr_parse(ctx, nla, &info);
2221 expr = kzalloc(info.ops->size, GFP_KERNEL);
2225 err = nf_tables_newexpr(ctx, &info, expr);
2233 owner = info.ops->type->owner;
2234 if (info.ops->type->release_ops)
2235 info.ops->type->release_ops(info.ops);
2239 return ERR_PTR(err);
2242 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2244 nf_tables_expr_destroy(ctx, expr);
2252 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2255 struct nft_rule *rule;
2257 // FIXME: this sucks
2258 list_for_each_entry_rcu(rule, &chain->rules, list) {
2259 if (handle == rule->handle)
2263 return ERR_PTR(-ENOENT);
2266 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2267 const struct nlattr *nla)
2270 return ERR_PTR(-EINVAL);
2272 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2275 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2276 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2277 .len = NFT_TABLE_MAXNAMELEN - 1 },
2278 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2279 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2280 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2281 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2282 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2283 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2284 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2285 .len = NFT_USERDATA_MAXLEN },
2286 [NFTA_RULE_ID] = { .type = NLA_U32 },
2287 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2290 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2291 u32 portid, u32 seq, int event,
2292 u32 flags, int family,
2293 const struct nft_table *table,
2294 const struct nft_chain *chain,
2295 const struct nft_rule *rule,
2296 const struct nft_rule *prule)
2298 struct nlmsghdr *nlh;
2299 struct nfgenmsg *nfmsg;
2300 const struct nft_expr *expr, *next;
2301 struct nlattr *list;
2302 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2304 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2306 goto nla_put_failure;
2308 nfmsg = nlmsg_data(nlh);
2309 nfmsg->nfgen_family = family;
2310 nfmsg->version = NFNETLINK_V0;
2311 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
2313 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2314 goto nla_put_failure;
2315 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2316 goto nla_put_failure;
2317 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2319 goto nla_put_failure;
2321 if (event != NFT_MSG_DELRULE && prule) {
2322 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2323 cpu_to_be64(prule->handle),
2325 goto nla_put_failure;
2328 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2330 goto nla_put_failure;
2331 nft_rule_for_each_expr(expr, next, rule) {
2332 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2333 goto nla_put_failure;
2335 nla_nest_end(skb, list);
2338 struct nft_userdata *udata = nft_userdata(rule);
2339 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2341 goto nla_put_failure;
2344 nlmsg_end(skb, nlh);
2348 nlmsg_trim(skb, nlh);
2352 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2353 const struct nft_rule *rule, int event)
2355 struct sk_buff *skb;
2359 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2362 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2366 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2367 event, 0, ctx->family, ctx->table,
2368 ctx->chain, rule, NULL);
2374 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2375 ctx->report, GFP_KERNEL);
2378 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2381 struct nft_rule_dump_ctx {
2386 static int __nf_tables_dump_rules(struct sk_buff *skb,
2388 struct netlink_callback *cb,
2389 const struct nft_table *table,
2390 const struct nft_chain *chain)
2392 struct net *net = sock_net(skb->sk);
2393 const struct nft_rule *rule, *prule;
2394 unsigned int s_idx = cb->args[0];
2397 list_for_each_entry_rcu(rule, &chain->rules, list) {
2398 if (!nft_is_active(net, rule))
2403 memset(&cb->args[1], 0,
2404 sizeof(cb->args) - sizeof(cb->args[0]));
2406 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2409 NLM_F_MULTI | NLM_F_APPEND,
2411 table, chain, rule, prule) < 0)
2414 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2423 static int nf_tables_dump_rules(struct sk_buff *skb,
2424 struct netlink_callback *cb)
2426 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2427 const struct nft_rule_dump_ctx *ctx = cb->data;
2428 struct nft_table *table;
2429 const struct nft_chain *chain;
2430 unsigned int idx = 0;
2431 struct net *net = sock_net(skb->sk);
2432 int family = nfmsg->nfgen_family;
2435 cb->seq = net->nft.base_seq;
2437 list_for_each_entry_rcu(table, &net->nft.tables, list) {
2438 if (family != NFPROTO_UNSPEC && family != table->family)
2441 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2444 if (ctx && ctx->table && ctx->chain) {
2445 struct rhlist_head *list, *tmp;
2447 list = rhltable_lookup(&table->chains_ht, ctx->chain,
2448 nft_chain_ht_params);
2452 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2453 if (!nft_is_active(net, chain))
2455 __nf_tables_dump_rules(skb, &idx,
2462 list_for_each_entry_rcu(chain, &table->chains, list) {
2463 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2467 if (ctx && ctx->table)
2477 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2479 const struct nlattr * const *nla = cb->data;
2480 struct nft_rule_dump_ctx *ctx = NULL;
2482 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2483 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2487 if (nla[NFTA_RULE_TABLE]) {
2488 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2495 if (nla[NFTA_RULE_CHAIN]) {
2496 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2510 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2512 struct nft_rule_dump_ctx *ctx = cb->data;
2522 /* called with rcu_read_lock held */
2523 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2524 struct sk_buff *skb, const struct nlmsghdr *nlh,
2525 const struct nlattr * const nla[],
2526 struct netlink_ext_ack *extack)
2528 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2529 u8 genmask = nft_genmask_cur(net);
2530 const struct nft_chain *chain;
2531 const struct nft_rule *rule;
2532 struct nft_table *table;
2533 struct sk_buff *skb2;
2534 int family = nfmsg->nfgen_family;
2537 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2538 struct netlink_dump_control c = {
2539 .start= nf_tables_dump_rules_start,
2540 .dump = nf_tables_dump_rules,
2541 .done = nf_tables_dump_rules_done,
2542 .module = THIS_MODULE,
2543 .data = (void *)nla,
2546 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
2549 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2550 if (IS_ERR(table)) {
2551 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2552 return PTR_ERR(table);
2555 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2556 if (IS_ERR(chain)) {
2557 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2558 return PTR_ERR(chain);
2561 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2563 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2564 return PTR_ERR(rule);
2567 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
2571 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2572 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2573 family, table, chain, rule, NULL);
2577 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2584 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2585 struct nft_rule *rule)
2587 struct nft_expr *expr, *next;
2590 * Careful: some expressions might not be initialized in case this
2591 * is called on error from nf_tables_newrule().
2593 expr = nft_expr_first(rule);
2594 while (expr != nft_expr_last(rule) && expr->ops) {
2595 next = nft_expr_next(expr);
2596 nf_tables_expr_destroy(ctx, expr);
2602 static void nf_tables_rule_release(const struct nft_ctx *ctx,
2603 struct nft_rule *rule)
2605 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
2606 nf_tables_rule_destroy(ctx, rule);
2609 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
2611 struct nft_expr *expr, *last;
2612 const struct nft_data *data;
2613 struct nft_rule *rule;
2616 if (ctx->level == NFT_JUMP_STACK_SIZE)
2619 list_for_each_entry(rule, &chain->rules, list) {
2620 if (!nft_is_active_next(ctx->net, rule))
2623 nft_rule_for_each_expr(expr, last, rule) {
2624 if (!expr->ops->validate)
2627 err = expr->ops->validate(ctx, expr, &data);
2635 EXPORT_SYMBOL_GPL(nft_chain_validate);
2637 static int nft_table_validate(struct net *net, const struct nft_table *table)
2639 struct nft_chain *chain;
2640 struct nft_ctx ctx = {
2642 .family = table->family,
2646 list_for_each_entry(chain, &table->chains, list) {
2647 if (!nft_is_base_chain(chain))
2651 err = nft_chain_validate(&ctx, chain);
2659 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2660 const struct nlattr *nla);
2662 #define NFT_RULE_MAXEXPRS 128
2664 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2665 struct sk_buff *skb, const struct nlmsghdr *nlh,
2666 const struct nlattr * const nla[],
2667 struct netlink_ext_ack *extack)
2669 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2670 u8 genmask = nft_genmask_next(net);
2671 struct nft_expr_info *info = NULL;
2672 int family = nfmsg->nfgen_family;
2673 struct nft_flow_rule *flow;
2674 struct nft_table *table;
2675 struct nft_chain *chain;
2676 struct nft_rule *rule, *old_rule = NULL;
2677 struct nft_userdata *udata;
2678 struct nft_trans *trans = NULL;
2679 struct nft_expr *expr;
2682 unsigned int size, i, n, ulen = 0, usize = 0;
2684 u64 handle, pos_handle;
2686 lockdep_assert_held(&net->nft.commit_mutex);
2688 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2689 if (IS_ERR(table)) {
2690 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2691 return PTR_ERR(table);
2694 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2695 if (IS_ERR(chain)) {
2696 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2697 return PTR_ERR(chain);
2700 if (nla[NFTA_RULE_HANDLE]) {
2701 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2702 rule = __nft_rule_lookup(chain, handle);
2704 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2705 return PTR_ERR(rule);
2708 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2709 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2712 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2717 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
2718 nlh->nlmsg_flags & NLM_F_REPLACE)
2720 handle = nf_tables_alloc_handle(table);
2722 if (chain->use == UINT_MAX)
2725 if (nla[NFTA_RULE_POSITION]) {
2726 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2727 old_rule = __nft_rule_lookup(chain, pos_handle);
2728 if (IS_ERR(old_rule)) {
2729 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
2730 return PTR_ERR(old_rule);
2732 } else if (nla[NFTA_RULE_POSITION_ID]) {
2733 old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
2734 if (IS_ERR(old_rule)) {
2735 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
2736 return PTR_ERR(old_rule);
2741 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2745 if (nla[NFTA_RULE_EXPRESSIONS]) {
2746 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
2747 sizeof(struct nft_expr_info),
2752 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2754 if (nla_type(tmp) != NFTA_LIST_ELEM)
2756 if (n == NFT_RULE_MAXEXPRS)
2758 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2761 size += info[n].ops->size;
2765 /* Check for overflow of dlen field */
2767 if (size >= 1 << 12)
2770 if (nla[NFTA_RULE_USERDATA]) {
2771 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2773 usize = sizeof(struct nft_userdata) + ulen;
2777 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2781 nft_activate_next(net, rule);
2783 rule->handle = handle;
2785 rule->udata = ulen ? 1 : 0;
2788 udata = nft_userdata(rule);
2789 udata->len = ulen - 1;
2790 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2793 expr = nft_expr_first(rule);
2794 for (i = 0; i < n; i++) {
2795 err = nf_tables_newexpr(&ctx, &info[i], expr);
2799 if (info[i].ops->validate)
2800 nft_validate_state_update(net, NFT_VALIDATE_NEED);
2803 expr = nft_expr_next(expr);
2806 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2807 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
2808 if (trans == NULL) {
2812 err = nft_delrule(&ctx, old_rule);
2814 nft_trans_destroy(trans);
2818 list_add_tail_rcu(&rule->list, &old_rule->list);
2820 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
2826 if (nlh->nlmsg_flags & NLM_F_APPEND) {
2828 list_add_rcu(&rule->list, &old_rule->list);
2830 list_add_tail_rcu(&rule->list, &chain->rules);
2833 list_add_tail_rcu(&rule->list, &old_rule->list);
2835 list_add_rcu(&rule->list, &chain->rules);
2841 if (net->nft.validate_state == NFT_VALIDATE_DO)
2842 return nft_table_validate(net, table);
2844 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
2845 flow = nft_flow_rule_create(rule);
2847 return PTR_ERR(flow);
2849 nft_trans_flow_rule(trans) = flow;
2854 nf_tables_rule_release(&ctx, rule);
2856 for (i = 0; i < n; i++) {
2858 module_put(info[i].ops->type->owner);
2859 if (info[i].ops->type->release_ops)
2860 info[i].ops->type->release_ops(info[i].ops);
2867 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2868 const struct nlattr *nla)
2870 u32 id = ntohl(nla_get_be32(nla));
2871 struct nft_trans *trans;
2873 list_for_each_entry(trans, &net->nft.commit_list, list) {
2874 struct nft_rule *rule = nft_trans_rule(trans);
2876 if (trans->msg_type == NFT_MSG_NEWRULE &&
2877 id == nft_trans_rule_id(trans))
2880 return ERR_PTR(-ENOENT);
2883 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2884 struct sk_buff *skb, const struct nlmsghdr *nlh,
2885 const struct nlattr * const nla[],
2886 struct netlink_ext_ack *extack)
2888 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2889 u8 genmask = nft_genmask_next(net);
2890 struct nft_table *table;
2891 struct nft_chain *chain = NULL;
2892 struct nft_rule *rule;
2893 int family = nfmsg->nfgen_family, err = 0;
2896 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2897 if (IS_ERR(table)) {
2898 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2899 return PTR_ERR(table);
2902 if (nla[NFTA_RULE_CHAIN]) {
2903 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
2905 if (IS_ERR(chain)) {
2906 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2907 return PTR_ERR(chain);
2911 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2914 if (nla[NFTA_RULE_HANDLE]) {
2915 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2917 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2918 return PTR_ERR(rule);
2921 err = nft_delrule(&ctx, rule);
2922 } else if (nla[NFTA_RULE_ID]) {
2923 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2925 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
2926 return PTR_ERR(rule);
2929 err = nft_delrule(&ctx, rule);
2931 err = nft_delrule_by_chain(&ctx);
2934 list_for_each_entry(chain, &table->chains, list) {
2935 if (!nft_is_active_next(net, chain))
2939 err = nft_delrule_by_chain(&ctx);
2952 static LIST_HEAD(nf_tables_set_types);
2954 int nft_register_set(struct nft_set_type *type)
2956 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2957 list_add_tail_rcu(&type->list, &nf_tables_set_types);
2958 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2961 EXPORT_SYMBOL_GPL(nft_register_set);
2963 void nft_unregister_set(struct nft_set_type *type)
2965 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2966 list_del_rcu(&type->list);
2967 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2969 EXPORT_SYMBOL_GPL(nft_unregister_set);
2971 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
2972 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
2975 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
2977 return (flags & type->features) == (flags & NFT_SET_FEATURES);
2981 * Select a set implementation based on the data characteristics and the
2982 * given policy. The total memory use might not be known if no size is
2983 * given, in that case the amount of memory per element is used.
2985 static const struct nft_set_ops *
2986 nft_select_set_ops(const struct nft_ctx *ctx,
2987 const struct nlattr * const nla[],
2988 const struct nft_set_desc *desc,
2989 enum nft_set_policies policy)
2991 const struct nft_set_ops *ops, *bops;
2992 struct nft_set_estimate est, best;
2993 const struct nft_set_type *type;
2996 lockdep_assert_held(&ctx->net->nft.commit_mutex);
2997 lockdep_nfnl_nft_mutex_not_held();
2998 #ifdef CONFIG_MODULES
2999 if (list_empty(&nf_tables_set_types)) {
3000 nft_request_module(ctx->net, "nft-set");
3001 if (!list_empty(&nf_tables_set_types))
3002 return ERR_PTR(-EAGAIN);
3005 if (nla[NFTA_SET_FLAGS] != NULL)
3006 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3013 list_for_each_entry(type, &nf_tables_set_types, list) {
3016 if (!nft_set_ops_candidate(type, flags))
3018 if (!ops->estimate(desc, flags, &est))
3022 case NFT_SET_POL_PERFORMANCE:
3023 if (est.lookup < best.lookup)
3025 if (est.lookup == best.lookup &&
3026 est.space < best.space)
3029 case NFT_SET_POL_MEMORY:
3031 if (est.space < best.space)
3033 if (est.space == best.space &&
3034 est.lookup < best.lookup)
3036 } else if (est.size < best.size || !bops) {
3044 if (!try_module_get(type->owner))
3047 module_put(to_set_type(bops)->owner);
3056 return ERR_PTR(-EOPNOTSUPP);
3059 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3060 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3061 .len = NFT_TABLE_MAXNAMELEN - 1 },
3062 [NFTA_SET_NAME] = { .type = NLA_STRING,
3063 .len = NFT_SET_MAXNAMELEN - 1 },
3064 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3065 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3066 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3067 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3068 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
3069 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3070 [NFTA_SET_DESC] = { .type = NLA_NESTED },
3071 [NFTA_SET_ID] = { .type = NLA_U32 },
3072 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3073 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
3074 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3075 .len = NFT_USERDATA_MAXLEN },
3076 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3077 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
3080 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3081 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
3084 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
3085 const struct sk_buff *skb,
3086 const struct nlmsghdr *nlh,
3087 const struct nlattr * const nla[],
3088 struct netlink_ext_ack *extack,
3091 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3092 int family = nfmsg->nfgen_family;
3093 struct nft_table *table = NULL;
3095 if (nla[NFTA_SET_TABLE] != NULL) {
3096 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3098 if (IS_ERR(table)) {
3099 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3100 return PTR_ERR(table);
3104 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3108 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3109 const struct nlattr *nla, u8 genmask)
3111 struct nft_set *set;
3114 return ERR_PTR(-EINVAL);
3116 list_for_each_entry_rcu(set, &table->sets, list) {
3117 if (!nla_strcmp(nla, set->name) &&
3118 nft_active_genmask(set, genmask))
3121 return ERR_PTR(-ENOENT);
3124 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3125 const struct nlattr *nla,
3128 struct nft_set *set;
3130 list_for_each_entry(set, &table->sets, list) {
3131 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3132 nft_active_genmask(set, genmask))
3135 return ERR_PTR(-ENOENT);
3138 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3139 const struct nlattr *nla, u8 genmask)
3141 struct nft_trans *trans;
3142 u32 id = ntohl(nla_get_be32(nla));
3144 list_for_each_entry(trans, &net->nft.commit_list, list) {
3145 if (trans->msg_type == NFT_MSG_NEWSET) {
3146 struct nft_set *set = nft_trans_set(trans);
3148 if (id == nft_trans_set_id(trans) &&
3149 nft_active_genmask(set, genmask))
3153 return ERR_PTR(-ENOENT);
3156 struct nft_set *nft_set_lookup_global(const struct net *net,
3157 const struct nft_table *table,
3158 const struct nlattr *nla_set_name,
3159 const struct nlattr *nla_set_id,
3162 struct nft_set *set;
3164 set = nft_set_lookup(table, nla_set_name, genmask);
3169 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3173 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3175 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3178 const struct nft_set *i;
3180 unsigned long *inuse;
3181 unsigned int n = 0, min = 0;
3183 p = strchr(name, '%');
3185 if (p[1] != 'd' || strchr(p + 2, '%'))
3188 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3192 list_for_each_entry(i, &ctx->table->sets, list) {
3195 if (!nft_is_active_next(ctx->net, set))
3197 if (!sscanf(i->name, name, &tmp))
3199 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3202 set_bit(tmp - min, inuse);
3205 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3206 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3207 min += BITS_PER_BYTE * PAGE_SIZE;
3208 memset(inuse, 0, PAGE_SIZE);
3211 free_page((unsigned long)inuse);
3214 set->name = kasprintf(GFP_KERNEL, name, min + n);
3218 list_for_each_entry(i, &ctx->table->sets, list) {
3219 if (!nft_is_active_next(ctx->net, i))
3221 if (!strcmp(set->name, i->name)) {
3229 static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3231 u64 ms = be64_to_cpu(nla_get_be64(nla));
3232 u64 max = (u64)(~((u64)0));
3234 max = div_u64(max, NSEC_PER_MSEC);
3238 ms *= NSEC_PER_MSEC;
3239 *result = nsecs_to_jiffies64(ms);
3243 static __be64 nf_jiffies64_to_msecs(u64 input)
3245 return cpu_to_be64(jiffies64_to_msecs(input));
3248 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3249 const struct nft_set *set, u16 event, u16 flags)
3251 struct nfgenmsg *nfmsg;
3252 struct nlmsghdr *nlh;
3253 struct nlattr *desc;
3254 u32 portid = ctx->portid;
3257 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3258 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3261 goto nla_put_failure;
3263 nfmsg = nlmsg_data(nlh);
3264 nfmsg->nfgen_family = ctx->family;
3265 nfmsg->version = NFNETLINK_V0;
3266 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3268 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3269 goto nla_put_failure;
3270 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3271 goto nla_put_failure;
3272 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3274 goto nla_put_failure;
3275 if (set->flags != 0)
3276 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3277 goto nla_put_failure;
3279 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3280 goto nla_put_failure;
3281 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3282 goto nla_put_failure;
3283 if (set->flags & NFT_SET_MAP) {
3284 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3285 goto nla_put_failure;
3286 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3287 goto nla_put_failure;
3289 if (set->flags & NFT_SET_OBJECT &&
3290 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3291 goto nla_put_failure;
3294 nla_put_be64(skb, NFTA_SET_TIMEOUT,
3295 nf_jiffies64_to_msecs(set->timeout),
3297 goto nla_put_failure;
3299 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3300 goto nla_put_failure;
3302 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3303 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3304 goto nla_put_failure;
3307 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3308 goto nla_put_failure;
3310 desc = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3312 goto nla_put_failure;
3314 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3315 goto nla_put_failure;
3316 nla_nest_end(skb, desc);
3318 nlmsg_end(skb, nlh);
3322 nlmsg_trim(skb, nlh);
3326 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3327 const struct nft_set *set, int event,
3330 struct sk_buff *skb;
3331 u32 portid = ctx->portid;
3335 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3338 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3342 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3348 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
3352 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3355 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3357 const struct nft_set *set;
3358 unsigned int idx, s_idx = cb->args[0];
3359 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3360 struct net *net = sock_net(skb->sk);
3361 struct nft_ctx *ctx = cb->data, ctx_set;
3367 cb->seq = net->nft.base_seq;
3369 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3370 if (ctx->family != NFPROTO_UNSPEC &&
3371 ctx->family != table->family)
3374 if (ctx->table && ctx->table != table)
3378 if (cur_table != table)
3384 list_for_each_entry_rcu(set, &table->sets, list) {
3387 if (!nft_is_active(net, set))
3391 ctx_set.table = table;
3392 ctx_set.family = table->family;
3394 if (nf_tables_fill_set(skb, &ctx_set, set,
3398 cb->args[2] = (unsigned long) table;
3401 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3414 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3416 struct nft_ctx *ctx_dump = NULL;
3418 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3419 if (ctx_dump == NULL)
3422 cb->data = ctx_dump;
3426 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3432 /* called with rcu_read_lock held */
3433 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3434 struct sk_buff *skb, const struct nlmsghdr *nlh,
3435 const struct nlattr * const nla[],
3436 struct netlink_ext_ack *extack)
3438 u8 genmask = nft_genmask_cur(net);
3439 const struct nft_set *set;
3441 struct sk_buff *skb2;
3442 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3445 /* Verify existence before starting dump */
3446 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3451 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3452 struct netlink_dump_control c = {
3453 .start = nf_tables_dump_sets_start,
3454 .dump = nf_tables_dump_sets,
3455 .done = nf_tables_dump_sets_done,
3457 .module = THIS_MODULE,
3460 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3463 /* Only accept unspec with dump */
3464 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3465 return -EAFNOSUPPORT;
3466 if (!nla[NFTA_SET_TABLE])
3469 set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3471 return PTR_ERR(set);
3473 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3477 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3481 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3488 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
3489 const struct nlattr *nla)
3491 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
3494 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
3495 nft_set_desc_policy, NULL);
3499 if (da[NFTA_SET_DESC_SIZE] != NULL)
3500 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
3505 static int nf_tables_newset(struct net *net, struct sock *nlsk,
3506 struct sk_buff *skb, const struct nlmsghdr *nlh,
3507 const struct nlattr * const nla[],
3508 struct netlink_ext_ack *extack)
3510 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3511 u8 genmask = nft_genmask_next(net);
3512 int family = nfmsg->nfgen_family;
3513 const struct nft_set_ops *ops;
3514 struct nft_table *table;
3515 struct nft_set *set;
3520 u32 ktype, dtype, flags, policy, gc_int, objtype;
3521 struct nft_set_desc desc;
3522 unsigned char *udata;
3526 if (nla[NFTA_SET_TABLE] == NULL ||
3527 nla[NFTA_SET_NAME] == NULL ||
3528 nla[NFTA_SET_KEY_LEN] == NULL ||
3529 nla[NFTA_SET_ID] == NULL)
3532 memset(&desc, 0, sizeof(desc));
3534 ktype = NFT_DATA_VALUE;
3535 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3536 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3537 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3541 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
3542 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
3546 if (nla[NFTA_SET_FLAGS] != NULL) {
3547 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3548 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
3549 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
3550 NFT_SET_MAP | NFT_SET_EVAL |
3553 /* Only one of these operations is supported */
3554 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3555 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
3560 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3561 if (!(flags & NFT_SET_MAP))
3564 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3565 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3566 dtype != NFT_DATA_VERDICT)
3569 if (dtype != NFT_DATA_VERDICT) {
3570 if (nla[NFTA_SET_DATA_LEN] == NULL)
3572 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
3573 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
3576 desc.dlen = sizeof(struct nft_verdict);
3577 } else if (flags & NFT_SET_MAP)
3580 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3581 if (!(flags & NFT_SET_OBJECT))
3584 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3585 if (objtype == NFT_OBJECT_UNSPEC ||
3586 objtype > NFT_OBJECT_MAX)
3588 } else if (flags & NFT_SET_OBJECT)
3591 objtype = NFT_OBJECT_UNSPEC;
3594 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3595 if (!(flags & NFT_SET_TIMEOUT))
3598 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
3603 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3604 if (!(flags & NFT_SET_TIMEOUT))
3606 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3609 policy = NFT_SET_POL_PERFORMANCE;
3610 if (nla[NFTA_SET_POLICY] != NULL)
3611 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3613 if (nla[NFTA_SET_DESC] != NULL) {
3614 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
3619 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
3620 if (IS_ERR(table)) {
3621 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3622 return PTR_ERR(table);
3625 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
3627 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
3629 if (PTR_ERR(set) != -ENOENT) {
3630 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3631 return PTR_ERR(set);
3634 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3635 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3638 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3644 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3647 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
3649 return PTR_ERR(ops);
3652 if (nla[NFTA_SET_USERDATA])
3653 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3656 if (ops->privsize != NULL)
3657 size = ops->privsize(nla, &desc);
3659 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3665 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3671 err = nf_tables_set_alloc_name(&ctx, set, name);
3678 udata = set->data + size;
3679 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3682 INIT_LIST_HEAD(&set->bindings);
3684 write_pnet(&set->net, net);
3687 set->klen = desc.klen;
3689 set->objtype = objtype;
3690 set->dlen = desc.dlen;
3692 set->size = desc.size;
3693 set->policy = policy;
3696 set->timeout = timeout;
3697 set->gc_int = gc_int;
3698 set->handle = nf_tables_alloc_handle(table);
3700 err = ops->init(set, &desc, nla);
3704 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3708 list_add_tail_rcu(&set->list, &table->sets);
3719 module_put(to_set_type(ops)->owner);
3723 static void nft_set_destroy(struct nft_set *set)
3725 if (WARN_ON(set->use > 0))
3728 set->ops->destroy(set);
3729 module_put(to_set_type(set->ops)->owner);
3734 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3735 struct sk_buff *skb, const struct nlmsghdr *nlh,
3736 const struct nlattr * const nla[],
3737 struct netlink_ext_ack *extack)
3739 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3740 u8 genmask = nft_genmask_next(net);
3741 const struct nlattr *attr;
3742 struct nft_set *set;
3746 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3747 return -EAFNOSUPPORT;
3748 if (nla[NFTA_SET_TABLE] == NULL)
3751 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3756 if (nla[NFTA_SET_HANDLE]) {
3757 attr = nla[NFTA_SET_HANDLE];
3758 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
3760 attr = nla[NFTA_SET_NAME];
3761 set = nft_set_lookup(ctx.table, attr, genmask);
3765 NL_SET_BAD_ATTR(extack, attr);
3766 return PTR_ERR(set);
3769 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
3770 NL_SET_BAD_ATTR(extack, attr);
3774 return nft_delset(&ctx, set);
3777 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3778 struct nft_set *set,
3779 const struct nft_set_iter *iter,
3780 struct nft_set_elem *elem)
3782 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3783 enum nft_registers dreg;
3785 dreg = nft_type_to_reg(set->dtype);
3786 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3787 set->dtype == NFT_DATA_VERDICT ?
3788 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3792 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3793 struct nft_set_binding *binding)
3795 struct nft_set_binding *i;
3796 struct nft_set_iter iter;
3798 if (set->use == UINT_MAX)
3801 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
3804 if (binding->flags & NFT_SET_MAP) {
3805 /* If the set is already bound to the same chain all
3806 * jumps are already validated for that chain.
3808 list_for_each_entry(i, &set->bindings, list) {
3809 if (i->flags & NFT_SET_MAP &&
3810 i->chain == binding->chain)
3814 iter.genmask = nft_genmask_next(ctx->net);
3818 iter.fn = nf_tables_bind_check_setelem;
3820 set->ops->walk(ctx, set, &iter);
3825 binding->chain = ctx->chain;
3826 list_add_tail_rcu(&binding->list, &set->bindings);
3827 nft_set_trans_bind(ctx, set);
3832 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3834 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3835 struct nft_set_binding *binding, bool event)
3837 list_del_rcu(&binding->list);
3839 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
3840 list_del_rcu(&set->list);
3842 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
3847 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
3848 struct nft_set_binding *binding,
3849 enum nft_trans_phase phase)
3852 case NFT_TRANS_PREPARE:
3855 case NFT_TRANS_ABORT:
3856 case NFT_TRANS_RELEASE:
3860 nf_tables_unbind_set(ctx, set, binding,
3861 phase == NFT_TRANS_COMMIT);
3864 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
3866 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
3868 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
3869 nft_set_destroy(set);
3871 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
3873 const struct nft_set_ext_type nft_set_ext_types[] = {
3874 [NFT_SET_EXT_KEY] = {
3875 .align = __alignof__(u32),
3877 [NFT_SET_EXT_DATA] = {
3878 .align = __alignof__(u32),
3880 [NFT_SET_EXT_EXPR] = {
3881 .align = __alignof__(struct nft_expr),
3883 [NFT_SET_EXT_OBJREF] = {
3884 .len = sizeof(struct nft_object *),
3885 .align = __alignof__(struct nft_object *),
3887 [NFT_SET_EXT_FLAGS] = {
3889 .align = __alignof__(u8),
3891 [NFT_SET_EXT_TIMEOUT] = {
3893 .align = __alignof__(u64),
3895 [NFT_SET_EXT_EXPIRATION] = {
3897 .align = __alignof__(u64),
3899 [NFT_SET_EXT_USERDATA] = {
3900 .len = sizeof(struct nft_userdata),
3901 .align = __alignof__(struct nft_userdata),
3904 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3910 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3911 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3912 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3913 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3914 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3915 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
3916 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3917 .len = NFT_USERDATA_MAXLEN },
3918 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
3919 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING },
3922 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3923 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3924 .len = NFT_TABLE_MAXNAMELEN - 1 },
3925 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3926 .len = NFT_SET_MAXNAMELEN - 1 },
3927 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3928 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3931 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3932 const struct sk_buff *skb,
3933 const struct nlmsghdr *nlh,
3934 const struct nlattr * const nla[],
3935 struct netlink_ext_ack *extack,
3938 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3939 int family = nfmsg->nfgen_family;
3940 struct nft_table *table;
3942 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
3944 if (IS_ERR(table)) {
3945 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
3946 return PTR_ERR(table);
3949 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3953 static int nf_tables_fill_setelem(struct sk_buff *skb,
3954 const struct nft_set *set,
3955 const struct nft_set_elem *elem)
3957 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3958 unsigned char *b = skb_tail_pointer(skb);
3959 struct nlattr *nest;
3961 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3963 goto nla_put_failure;
3965 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3966 NFT_DATA_VALUE, set->klen) < 0)
3967 goto nla_put_failure;
3969 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3970 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3971 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3973 goto nla_put_failure;
3975 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3976 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3977 goto nla_put_failure;
3979 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3980 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3981 (*nft_set_ext_obj(ext))->key.name) < 0)
3982 goto nla_put_failure;
3984 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3985 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3986 htonl(*nft_set_ext_flags(ext))))
3987 goto nla_put_failure;
3989 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3990 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3991 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
3993 goto nla_put_failure;
3995 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3996 u64 expires, now = get_jiffies_64();
3998 expires = *nft_set_ext_expiration(ext);
3999 if (time_before64(now, expires))
4004 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4005 nf_jiffies64_to_msecs(expires),
4007 goto nla_put_failure;
4010 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4011 struct nft_userdata *udata;
4013 udata = nft_set_ext_userdata(ext);
4014 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4015 udata->len + 1, udata->data))
4016 goto nla_put_failure;
4019 nla_nest_end(skb, nest);
4027 struct nft_set_dump_args {
4028 const struct netlink_callback *cb;
4029 struct nft_set_iter iter;
4030 struct sk_buff *skb;
4033 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4034 struct nft_set *set,
4035 const struct nft_set_iter *iter,
4036 struct nft_set_elem *elem)
4038 struct nft_set_dump_args *args;
4040 args = container_of(iter, struct nft_set_dump_args, iter);
4041 return nf_tables_fill_setelem(args->skb, set, elem);
4044 struct nft_set_dump_ctx {
4045 const struct nft_set *set;
4049 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4051 struct nft_set_dump_ctx *dump_ctx = cb->data;
4052 struct net *net = sock_net(skb->sk);
4053 struct nft_table *table;
4054 struct nft_set *set;
4055 struct nft_set_dump_args args;
4056 bool set_found = false;
4057 struct nfgenmsg *nfmsg;
4058 struct nlmsghdr *nlh;
4059 struct nlattr *nest;
4064 list_for_each_entry_rcu(table, &net->nft.tables, list) {
4065 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4066 dump_ctx->ctx.family != table->family)
4069 if (table != dump_ctx->ctx.table)
4072 list_for_each_entry_rcu(set, &table->sets, list) {
4073 if (set == dump_ctx->set) {
4086 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4087 portid = NETLINK_CB(cb->skb).portid;
4088 seq = cb->nlh->nlmsg_seq;
4090 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4093 goto nla_put_failure;
4095 nfmsg = nlmsg_data(nlh);
4096 nfmsg->nfgen_family = table->family;
4097 nfmsg->version = NFNETLINK_V0;
4098 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4100 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4101 goto nla_put_failure;
4102 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4103 goto nla_put_failure;
4105 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4107 goto nla_put_failure;
4111 args.iter.genmask = nft_genmask_cur(net);
4112 args.iter.skip = cb->args[0];
4113 args.iter.count = 0;
4115 args.iter.fn = nf_tables_dump_setelem;
4116 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4119 nla_nest_end(skb, nest);
4120 nlmsg_end(skb, nlh);
4122 if (args.iter.err && args.iter.err != -EMSGSIZE)
4123 return args.iter.err;
4124 if (args.iter.count == cb->args[0])
4127 cb->args[0] = args.iter.count;
4135 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4137 struct nft_set_dump_ctx *dump_ctx = cb->data;
4139 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4141 return cb->data ? 0 : -ENOMEM;
4144 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4150 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4151 const struct nft_ctx *ctx, u32 seq,
4152 u32 portid, int event, u16 flags,
4153 const struct nft_set *set,
4154 const struct nft_set_elem *elem)
4156 struct nfgenmsg *nfmsg;
4157 struct nlmsghdr *nlh;
4158 struct nlattr *nest;
4161 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4162 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4165 goto nla_put_failure;
4167 nfmsg = nlmsg_data(nlh);
4168 nfmsg->nfgen_family = ctx->family;
4169 nfmsg->version = NFNETLINK_V0;
4170 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
4172 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4173 goto nla_put_failure;
4174 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4175 goto nla_put_failure;
4177 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4179 goto nla_put_failure;
4181 err = nf_tables_fill_setelem(skb, set, elem);
4183 goto nla_put_failure;
4185 nla_nest_end(skb, nest);
4187 nlmsg_end(skb, nlh);
4191 nlmsg_trim(skb, nlh);
4195 static int nft_setelem_parse_flags(const struct nft_set *set,
4196 const struct nlattr *attr, u32 *flags)
4201 *flags = ntohl(nla_get_be32(attr));
4202 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4204 if (!(set->flags & NFT_SET_INTERVAL) &&
4205 *flags & NFT_SET_ELEM_INTERVAL_END)
4211 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4212 const struct nlattr *attr)
4214 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4215 struct nft_data_desc desc;
4216 struct nft_set_elem elem;
4217 struct sk_buff *skb;
4222 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4223 nft_set_elem_policy, NULL);
4227 if (!nla[NFTA_SET_ELEM_KEY])
4230 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4234 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4235 nla[NFTA_SET_ELEM_KEY]);
4240 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4243 priv = set->ops->get(ctx->net, set, &elem, flags);
4245 return PTR_ERR(priv);
4250 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
4254 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4255 NFT_MSG_NEWSETELEM, 0, set, &elem);
4259 err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT);
4260 /* This avoids a loop in nfnetlink. */
4268 /* this avoids a loop in nfnetlink. */
4269 return err == -EAGAIN ? -ENOBUFS : err;
4272 /* called with rcu_read_lock held */
4273 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4274 struct sk_buff *skb, const struct nlmsghdr *nlh,
4275 const struct nlattr * const nla[],
4276 struct netlink_ext_ack *extack)
4278 u8 genmask = nft_genmask_cur(net);
4279 struct nft_set *set;
4280 struct nlattr *attr;
4284 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4289 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4291 return PTR_ERR(set);
4293 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4294 struct netlink_dump_control c = {
4295 .start = nf_tables_dump_set_start,
4296 .dump = nf_tables_dump_set,
4297 .done = nf_tables_dump_set_done,
4298 .module = THIS_MODULE,
4300 struct nft_set_dump_ctx dump_ctx = {
4306 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4309 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4312 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4313 err = nft_get_set_elem(&ctx, set, attr);
4321 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4322 const struct nft_set *set,
4323 const struct nft_set_elem *elem,
4324 int event, u16 flags)
4326 struct net *net = ctx->net;
4327 u32 portid = ctx->portid;
4328 struct sk_buff *skb;
4331 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4334 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4338 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
4345 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
4349 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4352 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
4354 struct nft_set *set)
4356 struct nft_trans *trans;
4358 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
4362 nft_trans_elem_set(trans) = set;
4366 void *nft_set_elem_init(const struct nft_set *set,
4367 const struct nft_set_ext_tmpl *tmpl,
4368 const u32 *key, const u32 *data,
4369 u64 timeout, u64 expiration, gfp_t gfp)
4371 struct nft_set_ext *ext;
4374 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
4378 ext = nft_set_elem_ext(set, elem);
4379 nft_set_ext_init(ext, tmpl);
4381 memcpy(nft_set_ext_key(ext), key, set->klen);
4382 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4383 memcpy(nft_set_ext_data(ext), data, set->dlen);
4384 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4385 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
4386 if (expiration == 0)
4387 *nft_set_ext_expiration(ext) += timeout;
4389 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
4390 *nft_set_ext_timeout(ext) = timeout;
4395 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
4398 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4399 struct nft_ctx ctx = {
4400 .net = read_pnet(&set->net),
4401 .family = set->table->family,
4404 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
4405 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4406 nft_data_release(nft_set_ext_data(ext), set->dtype);
4407 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) {
4408 struct nft_expr *expr = nft_set_ext_expr(ext);
4410 if (expr->ops->destroy_clone) {
4411 expr->ops->destroy_clone(&ctx, expr);
4412 module_put(expr->ops->type->owner);
4414 nf_tables_expr_destroy(&ctx, expr);
4417 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4418 (*nft_set_ext_obj(ext))->use--;
4421 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
4423 /* Only called from commit path, nft_set_elem_deactivate() already deals with
4424 * the refcounting from the preparation phase.
4426 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
4427 const struct nft_set *set, void *elem)
4429 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4431 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
4432 nf_tables_expr_destroy(ctx, nft_set_ext_expr(ext));
4436 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4437 const struct nlattr *attr, u32 nlmsg_flags)
4439 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4440 u8 genmask = nft_genmask_next(ctx->net);
4441 struct nft_data_desc d1, d2;
4442 struct nft_set_ext_tmpl tmpl;
4443 struct nft_set_ext *ext, *ext2;
4444 struct nft_set_elem elem;
4445 struct nft_set_binding *binding;
4446 struct nft_object *obj = NULL;
4447 struct nft_userdata *udata;
4448 struct nft_data data;
4449 enum nft_registers dreg;
4450 struct nft_trans *trans;
4457 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4458 nft_set_elem_policy, NULL);
4462 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4465 nft_set_ext_prepare(&tmpl);
4467 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4471 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4473 if (set->flags & NFT_SET_MAP) {
4474 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
4475 !(flags & NFT_SET_ELEM_INTERVAL_END))
4477 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
4478 flags & NFT_SET_ELEM_INTERVAL_END)
4481 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4486 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
4487 if (!(set->flags & NFT_SET_TIMEOUT))
4489 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
4493 } else if (set->flags & NFT_SET_TIMEOUT) {
4494 timeout = set->timeout;
4498 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
4499 if (!(set->flags & NFT_SET_TIMEOUT))
4501 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
4507 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
4508 nla[NFTA_SET_ELEM_KEY]);
4512 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
4515 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
4517 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
4518 if (timeout != set->timeout)
4519 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
4522 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
4523 if (!(set->flags & NFT_SET_OBJECT)) {
4527 obj = nft_obj_lookup(ctx->net, ctx->table,
4528 nla[NFTA_SET_ELEM_OBJREF],
4529 set->objtype, genmask);
4534 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
4537 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
4538 err = nft_data_init(ctx, &data, sizeof(data), &d2,
4539 nla[NFTA_SET_ELEM_DATA]);
4544 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
4547 dreg = nft_type_to_reg(set->dtype);
4548 list_for_each_entry(binding, &set->bindings, list) {
4549 struct nft_ctx bind_ctx = {
4551 .family = ctx->family,
4552 .table = ctx->table,
4553 .chain = (struct nft_chain *)binding->chain,
4556 if (!(binding->flags & NFT_SET_MAP))
4559 err = nft_validate_register_store(&bind_ctx, dreg,
4565 if (d2.type == NFT_DATA_VERDICT &&
4566 (data.verdict.code == NFT_GOTO ||
4567 data.verdict.code == NFT_JUMP))
4568 nft_validate_state_update(ctx->net,
4572 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
4575 /* The full maximum length of userdata can exceed the maximum
4576 * offset value (U8_MAX) for following extensions, therefor it
4577 * must be the last extension added.
4580 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
4581 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
4583 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
4588 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
4589 timeout, expiration, GFP_KERNEL);
4590 if (elem.priv == NULL)
4593 ext = nft_set_elem_ext(set, elem.priv);
4595 *nft_set_ext_flags(ext) = flags;
4597 udata = nft_set_ext_userdata(ext);
4598 udata->len = ulen - 1;
4599 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
4602 *nft_set_ext_obj(ext) = obj;
4606 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
4610 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
4611 err = set->ops->insert(ctx->net, set, &elem, &ext2);
4613 if (err == -EEXIST) {
4614 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
4615 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
4616 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
4617 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
4621 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4622 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
4623 memcmp(nft_set_ext_data(ext),
4624 nft_set_ext_data(ext2), set->dlen) != 0) ||
4625 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4626 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
4627 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
4629 else if (!(nlmsg_flags & NLM_F_EXCL))
4636 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
4641 nft_trans_elem(trans) = elem;
4642 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4646 set->ops->remove(ctx->net, set, &elem);
4654 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4655 nft_data_release(&data, d2.type);
4657 nft_data_release(&elem.key.val, d1.type);
4662 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
4663 struct sk_buff *skb, const struct nlmsghdr *nlh,
4664 const struct nlattr * const nla[],
4665 struct netlink_ext_ack *extack)
4667 u8 genmask = nft_genmask_next(net);
4668 const struct nlattr *attr;
4669 struct nft_set *set;
4673 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
4676 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4681 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4682 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
4684 return PTR_ERR(set);
4686 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4689 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4690 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
4695 if (net->nft.validate_state == NFT_VALIDATE_DO)
4696 return nft_table_validate(net, ctx.table);
4702 * nft_data_hold - hold a nft_data item
4704 * @data: struct nft_data to release
4705 * @type: type of data
4707 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4708 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
4709 * NFT_GOTO verdicts. This function must be called on active data objects
4710 * from the second phase of the commit protocol.
4712 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
4714 if (type == NFT_DATA_VERDICT) {
4715 switch (data->verdict.code) {
4718 data->verdict.chain->use++;
4724 static void nft_set_elem_activate(const struct net *net,
4725 const struct nft_set *set,
4726 struct nft_set_elem *elem)
4728 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4730 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4731 nft_data_hold(nft_set_ext_data(ext), set->dtype);
4732 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4733 (*nft_set_ext_obj(ext))->use++;
4736 static void nft_set_elem_deactivate(const struct net *net,
4737 const struct nft_set *set,
4738 struct nft_set_elem *elem)
4740 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4742 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4743 nft_data_release(nft_set_ext_data(ext), set->dtype);
4744 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4745 (*nft_set_ext_obj(ext))->use--;
4748 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
4749 const struct nlattr *attr)
4751 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4752 struct nft_set_ext_tmpl tmpl;
4753 struct nft_data_desc desc;
4754 struct nft_set_elem elem;
4755 struct nft_set_ext *ext;
4756 struct nft_trans *trans;
4761 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4762 nft_set_elem_policy, NULL);
4767 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4770 nft_set_ext_prepare(&tmpl);
4772 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4776 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4778 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4779 nla[NFTA_SET_ELEM_KEY]);
4784 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4787 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
4790 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
4792 if (elem.priv == NULL)
4795 ext = nft_set_elem_ext(set, elem.priv);
4797 *nft_set_ext_flags(ext) = flags;
4799 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
4800 if (trans == NULL) {
4805 priv = set->ops->deactivate(ctx->net, set, &elem);
4813 nft_set_elem_deactivate(ctx->net, set, &elem);
4815 nft_trans_elem(trans) = elem;
4816 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4824 nft_data_release(&elem.key.val, desc.type);
4829 static int nft_flush_set(const struct nft_ctx *ctx,
4830 struct nft_set *set,
4831 const struct nft_set_iter *iter,
4832 struct nft_set_elem *elem)
4834 struct nft_trans *trans;
4837 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
4838 sizeof(struct nft_trans_elem), GFP_ATOMIC);
4842 if (!set->ops->flush(ctx->net, set, elem->priv)) {
4848 nft_set_elem_deactivate(ctx->net, set, elem);
4849 nft_trans_elem_set(trans) = set;
4850 nft_trans_elem(trans) = *elem;
4851 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4859 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
4860 struct sk_buff *skb, const struct nlmsghdr *nlh,
4861 const struct nlattr * const nla[],
4862 struct netlink_ext_ack *extack)
4864 u8 genmask = nft_genmask_next(net);
4865 const struct nlattr *attr;
4866 struct nft_set *set;
4870 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4875 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4877 return PTR_ERR(set);
4878 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4881 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
4882 struct nft_set_iter iter = {
4884 .fn = nft_flush_set,
4886 set->ops->walk(&ctx, set, &iter);
4891 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4892 err = nft_del_setelem(&ctx, set, attr);
4901 void nft_set_gc_batch_release(struct rcu_head *rcu)
4903 struct nft_set_gc_batch *gcb;
4906 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4907 for (i = 0; i < gcb->head.cnt; i++)
4908 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
4911 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4913 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4916 struct nft_set_gc_batch *gcb;
4918 gcb = kzalloc(sizeof(*gcb), gfp);
4921 gcb->head.set = set;
4924 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4931 * nft_register_obj- register nf_tables stateful object type
4934 * Registers the object type for use with nf_tables. Returns zero on
4935 * success or a negative errno code otherwise.
4937 int nft_register_obj(struct nft_object_type *obj_type)
4939 if (obj_type->type == NFT_OBJECT_UNSPEC)
4942 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4943 list_add_rcu(&obj_type->list, &nf_tables_objects);
4944 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4947 EXPORT_SYMBOL_GPL(nft_register_obj);
4950 * nft_unregister_obj - unregister nf_tables object type
4953 * Unregisters the object type for use with nf_tables.
4955 void nft_unregister_obj(struct nft_object_type *obj_type)
4957 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4958 list_del_rcu(&obj_type->list);
4959 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4961 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4963 struct nft_object *nft_obj_lookup(const struct net *net,
4964 const struct nft_table *table,
4965 const struct nlattr *nla, u32 objtype,
4968 struct nft_object_hash_key k = { .table = table };
4969 char search[NFT_OBJ_MAXNAMELEN];
4970 struct rhlist_head *tmp, *list;
4971 struct nft_object *obj;
4973 nla_strlcpy(search, nla, sizeof(search));
4976 WARN_ON_ONCE(!rcu_read_lock_held() &&
4977 !lockdep_commit_lock_is_held(net));
4980 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
4984 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
4985 if (objtype == obj->ops->type->type &&
4986 nft_active_genmask(obj, genmask)) {
4993 return ERR_PTR(-ENOENT);
4995 EXPORT_SYMBOL_GPL(nft_obj_lookup);
4997 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
4998 const struct nlattr *nla,
4999 u32 objtype, u8 genmask)
5001 struct nft_object *obj;
5003 list_for_each_entry(obj, &table->objects, list) {
5004 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
5005 objtype == obj->ops->type->type &&
5006 nft_active_genmask(obj, genmask))
5009 return ERR_PTR(-ENOENT);
5012 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
5013 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
5014 .len = NFT_TABLE_MAXNAMELEN - 1 },
5015 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
5016 .len = NFT_OBJ_MAXNAMELEN - 1 },
5017 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
5018 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
5019 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
5022 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
5023 const struct nft_object_type *type,
5024 const struct nlattr *attr)
5027 const struct nft_object_ops *ops;
5028 struct nft_object *obj;
5031 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
5036 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
5037 type->policy, NULL);
5041 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
5044 if (type->select_ops) {
5045 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
5055 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
5059 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
5072 return ERR_PTR(err);
5075 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
5076 struct nft_object *obj, bool reset)
5078 struct nlattr *nest;
5080 nest = nla_nest_start_noflag(skb, attr);
5082 goto nla_put_failure;
5083 if (obj->ops->dump(skb, obj, reset) < 0)
5084 goto nla_put_failure;
5085 nla_nest_end(skb, nest);
5092 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
5094 const struct nft_object_type *type;
5096 list_for_each_entry(type, &nf_tables_objects, list) {
5097 if (objtype == type->type)
5103 static const struct nft_object_type *
5104 nft_obj_type_get(struct net *net, u32 objtype)
5106 const struct nft_object_type *type;
5108 type = __nft_obj_type_get(objtype);
5109 if (type != NULL && try_module_get(type->owner))
5112 lockdep_nfnl_nft_mutex_not_held();
5113 #ifdef CONFIG_MODULES
5115 nft_request_module(net, "nft-obj-%u", objtype);
5116 if (__nft_obj_type_get(objtype))
5117 return ERR_PTR(-EAGAIN);
5120 return ERR_PTR(-ENOENT);
5123 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
5124 struct sk_buff *skb, const struct nlmsghdr *nlh,
5125 const struct nlattr * const nla[],
5126 struct netlink_ext_ack *extack)
5128 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5129 const struct nft_object_type *type;
5130 u8 genmask = nft_genmask_next(net);
5131 int family = nfmsg->nfgen_family;
5132 struct nft_table *table;
5133 struct nft_object *obj;
5138 if (!nla[NFTA_OBJ_TYPE] ||
5139 !nla[NFTA_OBJ_NAME] ||
5140 !nla[NFTA_OBJ_DATA])
5143 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5144 if (IS_ERR(table)) {
5145 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5146 return PTR_ERR(table);
5149 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5150 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
5153 if (err != -ENOENT) {
5154 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5158 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5159 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5165 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5167 type = nft_obj_type_get(net, objtype);
5169 return PTR_ERR(type);
5171 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
5176 obj->key.table = table;
5177 obj->handle = nf_tables_alloc_handle(table);
5179 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
5180 if (!obj->key.name) {
5185 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
5189 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
5190 nft_objname_ht_params);
5194 list_add_tail_rcu(&obj->list, &table->objects);
5198 /* queued in transaction log */
5199 INIT_LIST_HEAD(&obj->list);
5202 kfree(obj->key.name);
5204 if (obj->ops->destroy)
5205 obj->ops->destroy(&ctx, obj);
5208 module_put(type->owner);
5212 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
5213 u32 portid, u32 seq, int event, u32 flags,
5214 int family, const struct nft_table *table,
5215 struct nft_object *obj, bool reset)
5217 struct nfgenmsg *nfmsg;
5218 struct nlmsghdr *nlh;
5220 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5221 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5223 goto nla_put_failure;
5225 nfmsg = nlmsg_data(nlh);
5226 nfmsg->nfgen_family = family;
5227 nfmsg->version = NFNETLINK_V0;
5228 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5230 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
5231 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
5232 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
5233 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
5234 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
5235 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
5237 goto nla_put_failure;
5239 nlmsg_end(skb, nlh);
5243 nlmsg_trim(skb, nlh);
5247 struct nft_obj_filter {
5252 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
5254 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5255 const struct nft_table *table;
5256 unsigned int idx = 0, s_idx = cb->args[0];
5257 struct nft_obj_filter *filter = cb->data;
5258 struct net *net = sock_net(skb->sk);
5259 int family = nfmsg->nfgen_family;
5260 struct nft_object *obj;
5263 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5267 cb->seq = net->nft.base_seq;
5269 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5270 if (family != NFPROTO_UNSPEC && family != table->family)
5273 list_for_each_entry_rcu(obj, &table->objects, list) {
5274 if (!nft_is_active(net, obj))
5279 memset(&cb->args[1], 0,
5280 sizeof(cb->args) - sizeof(cb->args[0]));
5281 if (filter && filter->table &&
5282 strcmp(filter->table, table->name))
5285 filter->type != NFT_OBJECT_UNSPEC &&
5286 obj->ops->type->type != filter->type)
5289 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
5292 NLM_F_MULTI | NLM_F_APPEND,
5293 table->family, table,
5297 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5309 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
5311 const struct nlattr * const *nla = cb->data;
5312 struct nft_obj_filter *filter = NULL;
5314 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
5315 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5319 if (nla[NFTA_OBJ_TABLE]) {
5320 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
5321 if (!filter->table) {
5327 if (nla[NFTA_OBJ_TYPE])
5328 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5335 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
5337 struct nft_obj_filter *filter = cb->data;
5340 kfree(filter->table);
5347 /* called with rcu_read_lock held */
5348 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
5349 struct sk_buff *skb, const struct nlmsghdr *nlh,
5350 const struct nlattr * const nla[],
5351 struct netlink_ext_ack *extack)
5353 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5354 u8 genmask = nft_genmask_cur(net);
5355 int family = nfmsg->nfgen_family;
5356 const struct nft_table *table;
5357 struct nft_object *obj;
5358 struct sk_buff *skb2;
5363 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5364 struct netlink_dump_control c = {
5365 .start = nf_tables_dump_obj_start,
5366 .dump = nf_tables_dump_obj,
5367 .done = nf_tables_dump_obj_done,
5368 .module = THIS_MODULE,
5369 .data = (void *)nla,
5372 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5375 if (!nla[NFTA_OBJ_NAME] ||
5376 !nla[NFTA_OBJ_TYPE])
5379 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5380 if (IS_ERR(table)) {
5381 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5382 return PTR_ERR(table);
5385 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5386 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
5388 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5389 return PTR_ERR(obj);
5392 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5396 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5399 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
5400 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
5401 family, table, obj, reset);
5405 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5411 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
5413 if (obj->ops->destroy)
5414 obj->ops->destroy(ctx, obj);
5416 module_put(obj->ops->type->owner);
5417 kfree(obj->key.name);
5421 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
5422 struct sk_buff *skb, const struct nlmsghdr *nlh,
5423 const struct nlattr * const nla[],
5424 struct netlink_ext_ack *extack)
5426 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5427 u8 genmask = nft_genmask_next(net);
5428 int family = nfmsg->nfgen_family;
5429 const struct nlattr *attr;
5430 struct nft_table *table;
5431 struct nft_object *obj;
5435 if (!nla[NFTA_OBJ_TYPE] ||
5436 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
5439 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5440 if (IS_ERR(table)) {
5441 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5442 return PTR_ERR(table);
5445 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5446 if (nla[NFTA_OBJ_HANDLE]) {
5447 attr = nla[NFTA_OBJ_HANDLE];
5448 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
5450 attr = nla[NFTA_OBJ_NAME];
5451 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
5455 NL_SET_BAD_ATTR(extack, attr);
5456 return PTR_ERR(obj);
5459 NL_SET_BAD_ATTR(extack, attr);
5463 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5465 return nft_delobj(&ctx, obj);
5468 void nft_obj_notify(struct net *net, const struct nft_table *table,
5469 struct nft_object *obj, u32 portid, u32 seq, int event,
5470 int family, int report, gfp_t gfp)
5472 struct sk_buff *skb;
5476 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5479 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
5483 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
5490 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
5493 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5495 EXPORT_SYMBOL_GPL(nft_obj_notify);
5497 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
5498 struct nft_object *obj, int event)
5500 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
5501 ctx->family, ctx->report, GFP_KERNEL);
5507 void nft_register_flowtable_type(struct nf_flowtable_type *type)
5509 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5510 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
5511 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5513 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
5515 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
5517 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5518 list_del_rcu(&type->list);
5519 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5521 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
5523 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
5524 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
5525 .len = NFT_NAME_MAXLEN - 1 },
5526 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
5527 .len = NFT_NAME_MAXLEN - 1 },
5528 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
5529 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
5532 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
5533 const struct nlattr *nla, u8 genmask)
5535 struct nft_flowtable *flowtable;
5537 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5538 if (!nla_strcmp(nla, flowtable->name) &&
5539 nft_active_genmask(flowtable, genmask))
5542 return ERR_PTR(-ENOENT);
5544 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
5546 static struct nft_flowtable *
5547 nft_flowtable_lookup_byhandle(const struct nft_table *table,
5548 const struct nlattr *nla, u8 genmask)
5550 struct nft_flowtable *flowtable;
5552 list_for_each_entry(flowtable, &table->flowtables, list) {
5553 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
5554 nft_active_genmask(flowtable, genmask))
5557 return ERR_PTR(-ENOENT);
5560 static int nf_tables_parse_devices(const struct nft_ctx *ctx,
5561 const struct nlattr *attr,
5562 struct net_device *dev_array[], int *len)
5564 const struct nlattr *tmp;
5565 struct net_device *dev;
5566 char ifname[IFNAMSIZ];
5567 int rem, n = 0, err;
5569 nla_for_each_nested(tmp, attr, rem) {
5570 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
5575 nla_strlcpy(ifname, tmp, IFNAMSIZ);
5576 dev = __dev_get_by_name(ctx->net, ifname);
5582 dev_array[n++] = dev;
5583 if (n == NFT_FLOWTABLE_DEVICE_MAX) {
5597 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
5598 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
5599 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
5600 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
5603 static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx,
5604 const struct nlattr *attr,
5605 struct nft_flowtable *flowtable)
5607 struct net_device *dev_array[NFT_FLOWTABLE_DEVICE_MAX];
5608 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
5609 struct nf_hook_ops *ops;
5610 int hooknum, priority;
5613 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
5614 nft_flowtable_hook_policy, NULL);
5618 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
5619 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] ||
5620 !tb[NFTA_FLOWTABLE_HOOK_DEVS])
5623 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
5624 if (hooknum != NF_NETDEV_INGRESS)
5627 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
5629 err = nf_tables_parse_devices(ctx, tb[NFTA_FLOWTABLE_HOOK_DEVS],
5634 ops = kcalloc(n, sizeof(struct nf_hook_ops), GFP_KERNEL);
5638 flowtable->hooknum = hooknum;
5639 flowtable->priority = priority;
5640 flowtable->ops = ops;
5641 flowtable->ops_len = n;
5643 for (i = 0; i < n; i++) {
5644 flowtable->ops[i].pf = NFPROTO_NETDEV;
5645 flowtable->ops[i].hooknum = hooknum;
5646 flowtable->ops[i].priority = priority;
5647 flowtable->ops[i].priv = &flowtable->data;
5648 flowtable->ops[i].hook = flowtable->data.type->hook;
5649 flowtable->ops[i].dev = dev_array[i];
5655 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
5657 const struct nf_flowtable_type *type;
5659 list_for_each_entry(type, &nf_tables_flowtables, list) {
5660 if (family == type->family)
5666 static const struct nf_flowtable_type *
5667 nft_flowtable_type_get(struct net *net, u8 family)
5669 const struct nf_flowtable_type *type;
5671 type = __nft_flowtable_type_get(family);
5672 if (type != NULL && try_module_get(type->owner))
5675 lockdep_nfnl_nft_mutex_not_held();
5676 #ifdef CONFIG_MODULES
5678 nft_request_module(net, "nf-flowtable-%u", family);
5679 if (__nft_flowtable_type_get(family))
5680 return ERR_PTR(-EAGAIN);
5683 return ERR_PTR(-ENOENT);
5686 static void nft_unregister_flowtable_net_hooks(struct net *net,
5687 struct nft_flowtable *flowtable)
5691 for (i = 0; i < flowtable->ops_len; i++) {
5692 if (!flowtable->ops[i].dev)
5695 nf_unregister_net_hook(net, &flowtable->ops[i]);
5699 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
5700 struct sk_buff *skb,
5701 const struct nlmsghdr *nlh,
5702 const struct nlattr * const nla[],
5703 struct netlink_ext_ack *extack)
5705 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5706 const struct nf_flowtable_type *type;
5707 struct nft_flowtable *flowtable, *ft;
5708 u8 genmask = nft_genmask_next(net);
5709 int family = nfmsg->nfgen_family;
5710 struct nft_table *table;
5714 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5715 !nla[NFTA_FLOWTABLE_NAME] ||
5716 !nla[NFTA_FLOWTABLE_HOOK])
5719 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5721 if (IS_ERR(table)) {
5722 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5723 return PTR_ERR(table);
5726 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5728 if (IS_ERR(flowtable)) {
5729 err = PTR_ERR(flowtable);
5730 if (err != -ENOENT) {
5731 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5735 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5736 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5743 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5745 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
5749 flowtable->table = table;
5750 flowtable->handle = nf_tables_alloc_handle(table);
5752 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
5753 if (!flowtable->name) {
5758 type = nft_flowtable_type_get(net, family);
5760 err = PTR_ERR(type);
5764 flowtable->data.type = type;
5765 err = type->init(&flowtable->data);
5769 err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
5774 for (i = 0; i < flowtable->ops_len; i++) {
5775 if (!flowtable->ops[i].dev)
5778 list_for_each_entry(ft, &table->flowtables, list) {
5779 for (k = 0; k < ft->ops_len; k++) {
5780 if (!ft->ops[k].dev)
5783 if (flowtable->ops[i].dev == ft->ops[k].dev &&
5784 flowtable->ops[i].pf == ft->ops[k].pf) {
5791 err = nf_register_net_hook(net, &flowtable->ops[i]);
5796 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
5800 list_add_tail_rcu(&flowtable->list, &table->flowtables);
5805 i = flowtable->ops_len;
5807 for (k = i - 1; k >= 0; k--)
5808 nf_unregister_net_hook(net, &flowtable->ops[k]);
5810 kfree(flowtable->ops);
5812 flowtable->data.type->free(&flowtable->data);
5814 module_put(type->owner);
5816 kfree(flowtable->name);
5822 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
5823 struct sk_buff *skb,
5824 const struct nlmsghdr *nlh,
5825 const struct nlattr * const nla[],
5826 struct netlink_ext_ack *extack)
5828 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5829 u8 genmask = nft_genmask_next(net);
5830 int family = nfmsg->nfgen_family;
5831 struct nft_flowtable *flowtable;
5832 const struct nlattr *attr;
5833 struct nft_table *table;
5836 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5837 (!nla[NFTA_FLOWTABLE_NAME] &&
5838 !nla[NFTA_FLOWTABLE_HANDLE]))
5841 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5843 if (IS_ERR(table)) {
5844 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5845 return PTR_ERR(table);
5848 if (nla[NFTA_FLOWTABLE_HANDLE]) {
5849 attr = nla[NFTA_FLOWTABLE_HANDLE];
5850 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
5852 attr = nla[NFTA_FLOWTABLE_NAME];
5853 flowtable = nft_flowtable_lookup(table, attr, genmask);
5856 if (IS_ERR(flowtable)) {
5857 NL_SET_BAD_ATTR(extack, attr);
5858 return PTR_ERR(flowtable);
5860 if (flowtable->use > 0) {
5861 NL_SET_BAD_ATTR(extack, attr);
5865 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5867 return nft_delflowtable(&ctx, flowtable);
5870 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
5871 u32 portid, u32 seq, int event,
5872 u32 flags, int family,
5873 struct nft_flowtable *flowtable)
5875 struct nlattr *nest, *nest_devs;
5876 struct nfgenmsg *nfmsg;
5877 struct nlmsghdr *nlh;
5880 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5881 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5883 goto nla_put_failure;
5885 nfmsg = nlmsg_data(nlh);
5886 nfmsg->nfgen_family = family;
5887 nfmsg->version = NFNETLINK_V0;
5888 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5890 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
5891 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
5892 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
5893 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
5894 NFTA_FLOWTABLE_PAD))
5895 goto nla_put_failure;
5897 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
5899 goto nla_put_failure;
5900 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
5901 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->priority)))
5902 goto nla_put_failure;
5904 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
5906 goto nla_put_failure;
5908 for (i = 0; i < flowtable->ops_len; i++) {
5909 const struct net_device *dev = READ_ONCE(flowtable->ops[i].dev);
5912 nla_put_string(skb, NFTA_DEVICE_NAME, dev->name))
5913 goto nla_put_failure;
5915 nla_nest_end(skb, nest_devs);
5916 nla_nest_end(skb, nest);
5918 nlmsg_end(skb, nlh);
5922 nlmsg_trim(skb, nlh);
5926 struct nft_flowtable_filter {
5930 static int nf_tables_dump_flowtable(struct sk_buff *skb,
5931 struct netlink_callback *cb)
5933 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5934 struct nft_flowtable_filter *filter = cb->data;
5935 unsigned int idx = 0, s_idx = cb->args[0];
5936 struct net *net = sock_net(skb->sk);
5937 int family = nfmsg->nfgen_family;
5938 struct nft_flowtable *flowtable;
5939 const struct nft_table *table;
5942 cb->seq = net->nft.base_seq;
5944 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5945 if (family != NFPROTO_UNSPEC && family != table->family)
5948 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5949 if (!nft_is_active(net, flowtable))
5954 memset(&cb->args[1], 0,
5955 sizeof(cb->args) - sizeof(cb->args[0]));
5956 if (filter && filter->table &&
5957 strcmp(filter->table, table->name))
5960 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
5962 NFT_MSG_NEWFLOWTABLE,
5963 NLM_F_MULTI | NLM_F_APPEND,
5964 table->family, flowtable) < 0)
5967 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5979 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
5981 const struct nlattr * const *nla = cb->data;
5982 struct nft_flowtable_filter *filter = NULL;
5984 if (nla[NFTA_FLOWTABLE_TABLE]) {
5985 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5989 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
5991 if (!filter->table) {
6001 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
6003 struct nft_flowtable_filter *filter = cb->data;
6008 kfree(filter->table);
6014 /* called with rcu_read_lock held */
6015 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
6016 struct sk_buff *skb,
6017 const struct nlmsghdr *nlh,
6018 const struct nlattr * const nla[],
6019 struct netlink_ext_ack *extack)
6021 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6022 u8 genmask = nft_genmask_cur(net);
6023 int family = nfmsg->nfgen_family;
6024 struct nft_flowtable *flowtable;
6025 const struct nft_table *table;
6026 struct sk_buff *skb2;
6029 if (nlh->nlmsg_flags & NLM_F_DUMP) {
6030 struct netlink_dump_control c = {
6031 .start = nf_tables_dump_flowtable_start,
6032 .dump = nf_tables_dump_flowtable,
6033 .done = nf_tables_dump_flowtable_done,
6034 .module = THIS_MODULE,
6035 .data = (void *)nla,
6038 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
6041 if (!nla[NFTA_FLOWTABLE_NAME])
6044 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6047 return PTR_ERR(table);
6049 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6051 if (IS_ERR(flowtable))
6052 return PTR_ERR(flowtable);
6054 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6058 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
6060 NFT_MSG_NEWFLOWTABLE, 0, family,
6065 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
6071 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
6072 struct nft_flowtable *flowtable,
6075 struct sk_buff *skb;
6079 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
6082 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6086 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
6088 ctx->family, flowtable);
6094 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
6095 ctx->report, GFP_KERNEL);
6098 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
6101 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
6103 kfree(flowtable->ops);
6104 kfree(flowtable->name);
6105 flowtable->data.type->free(&flowtable->data);
6106 module_put(flowtable->data.type->owner);
6110 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
6111 u32 portid, u32 seq)
6113 struct nlmsghdr *nlh;
6114 struct nfgenmsg *nfmsg;
6115 char buf[TASK_COMM_LEN];
6116 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
6118 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
6120 goto nla_put_failure;
6122 nfmsg = nlmsg_data(nlh);
6123 nfmsg->nfgen_family = AF_UNSPEC;
6124 nfmsg->version = NFNETLINK_V0;
6125 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
6127 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
6128 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
6129 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
6130 goto nla_put_failure;
6132 nlmsg_end(skb, nlh);
6136 nlmsg_trim(skb, nlh);
6140 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
6141 struct nft_flowtable *flowtable)
6145 for (i = 0; i < flowtable->ops_len; i++) {
6146 if (flowtable->ops[i].dev != dev)
6149 nf_unregister_net_hook(dev_net(dev), &flowtable->ops[i]);
6150 flowtable->ops[i].dev = NULL;
6155 static int nf_tables_flowtable_event(struct notifier_block *this,
6156 unsigned long event, void *ptr)
6158 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
6159 struct nft_flowtable *flowtable;
6160 struct nft_table *table;
6163 if (event != NETDEV_UNREGISTER)
6167 mutex_lock(&net->nft.commit_mutex);
6168 list_for_each_entry(table, &net->nft.tables, list) {
6169 list_for_each_entry(flowtable, &table->flowtables, list) {
6170 nft_flowtable_event(event, dev, flowtable);
6173 mutex_unlock(&net->nft.commit_mutex);
6178 static struct notifier_block nf_tables_flowtable_notifier = {
6179 .notifier_call = nf_tables_flowtable_event,
6182 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
6185 struct nlmsghdr *nlh = nlmsg_hdr(skb);
6186 struct sk_buff *skb2;
6189 if (nlmsg_report(nlh) &&
6190 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6193 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6197 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6204 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6205 nlmsg_report(nlh), GFP_KERNEL);
6208 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6212 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
6213 struct sk_buff *skb, const struct nlmsghdr *nlh,
6214 const struct nlattr * const nla[],
6215 struct netlink_ext_ack *extack)
6217 struct sk_buff *skb2;
6220 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6224 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6229 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
6235 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
6236 [NFT_MSG_NEWTABLE] = {
6237 .call_batch = nf_tables_newtable,
6238 .attr_count = NFTA_TABLE_MAX,
6239 .policy = nft_table_policy,
6241 [NFT_MSG_GETTABLE] = {
6242 .call_rcu = nf_tables_gettable,
6243 .attr_count = NFTA_TABLE_MAX,
6244 .policy = nft_table_policy,
6246 [NFT_MSG_DELTABLE] = {
6247 .call_batch = nf_tables_deltable,
6248 .attr_count = NFTA_TABLE_MAX,
6249 .policy = nft_table_policy,
6251 [NFT_MSG_NEWCHAIN] = {
6252 .call_batch = nf_tables_newchain,
6253 .attr_count = NFTA_CHAIN_MAX,
6254 .policy = nft_chain_policy,
6256 [NFT_MSG_GETCHAIN] = {
6257 .call_rcu = nf_tables_getchain,
6258 .attr_count = NFTA_CHAIN_MAX,
6259 .policy = nft_chain_policy,
6261 [NFT_MSG_DELCHAIN] = {
6262 .call_batch = nf_tables_delchain,
6263 .attr_count = NFTA_CHAIN_MAX,
6264 .policy = nft_chain_policy,
6266 [NFT_MSG_NEWRULE] = {
6267 .call_batch = nf_tables_newrule,
6268 .attr_count = NFTA_RULE_MAX,
6269 .policy = nft_rule_policy,
6271 [NFT_MSG_GETRULE] = {
6272 .call_rcu = nf_tables_getrule,
6273 .attr_count = NFTA_RULE_MAX,
6274 .policy = nft_rule_policy,
6276 [NFT_MSG_DELRULE] = {
6277 .call_batch = nf_tables_delrule,
6278 .attr_count = NFTA_RULE_MAX,
6279 .policy = nft_rule_policy,
6281 [NFT_MSG_NEWSET] = {
6282 .call_batch = nf_tables_newset,
6283 .attr_count = NFTA_SET_MAX,
6284 .policy = nft_set_policy,
6286 [NFT_MSG_GETSET] = {
6287 .call_rcu = nf_tables_getset,
6288 .attr_count = NFTA_SET_MAX,
6289 .policy = nft_set_policy,
6291 [NFT_MSG_DELSET] = {
6292 .call_batch = nf_tables_delset,
6293 .attr_count = NFTA_SET_MAX,
6294 .policy = nft_set_policy,
6296 [NFT_MSG_NEWSETELEM] = {
6297 .call_batch = nf_tables_newsetelem,
6298 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6299 .policy = nft_set_elem_list_policy,
6301 [NFT_MSG_GETSETELEM] = {
6302 .call_rcu = nf_tables_getsetelem,
6303 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6304 .policy = nft_set_elem_list_policy,
6306 [NFT_MSG_DELSETELEM] = {
6307 .call_batch = nf_tables_delsetelem,
6308 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6309 .policy = nft_set_elem_list_policy,
6311 [NFT_MSG_GETGEN] = {
6312 .call_rcu = nf_tables_getgen,
6314 [NFT_MSG_NEWOBJ] = {
6315 .call_batch = nf_tables_newobj,
6316 .attr_count = NFTA_OBJ_MAX,
6317 .policy = nft_obj_policy,
6319 [NFT_MSG_GETOBJ] = {
6320 .call_rcu = nf_tables_getobj,
6321 .attr_count = NFTA_OBJ_MAX,
6322 .policy = nft_obj_policy,
6324 [NFT_MSG_DELOBJ] = {
6325 .call_batch = nf_tables_delobj,
6326 .attr_count = NFTA_OBJ_MAX,
6327 .policy = nft_obj_policy,
6329 [NFT_MSG_GETOBJ_RESET] = {
6330 .call_rcu = nf_tables_getobj,
6331 .attr_count = NFTA_OBJ_MAX,
6332 .policy = nft_obj_policy,
6334 [NFT_MSG_NEWFLOWTABLE] = {
6335 .call_batch = nf_tables_newflowtable,
6336 .attr_count = NFTA_FLOWTABLE_MAX,
6337 .policy = nft_flowtable_policy,
6339 [NFT_MSG_GETFLOWTABLE] = {
6340 .call_rcu = nf_tables_getflowtable,
6341 .attr_count = NFTA_FLOWTABLE_MAX,
6342 .policy = nft_flowtable_policy,
6344 [NFT_MSG_DELFLOWTABLE] = {
6345 .call_batch = nf_tables_delflowtable,
6346 .attr_count = NFTA_FLOWTABLE_MAX,
6347 .policy = nft_flowtable_policy,
6351 static int nf_tables_validate(struct net *net)
6353 struct nft_table *table;
6355 switch (net->nft.validate_state) {
6356 case NFT_VALIDATE_SKIP:
6358 case NFT_VALIDATE_NEED:
6359 nft_validate_state_update(net, NFT_VALIDATE_DO);
6361 case NFT_VALIDATE_DO:
6362 list_for_each_entry(table, &net->nft.tables, list) {
6363 if (nft_table_validate(net, table) < 0)
6372 /* a drop policy has to be deferred until all rules have been activated,
6373 * otherwise a large ruleset that contains a drop-policy base chain will
6374 * cause all packets to get dropped until the full transaction has been
6377 * We defer the drop policy until the transaction has been finalized.
6379 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
6381 struct nft_base_chain *basechain;
6383 if (nft_trans_chain_policy(trans) != NF_DROP)
6386 if (!nft_is_base_chain(trans->ctx.chain))
6389 basechain = nft_base_chain(trans->ctx.chain);
6390 basechain->policy = NF_DROP;
6393 static void nft_chain_commit_update(struct nft_trans *trans)
6395 struct nft_base_chain *basechain;
6397 if (nft_trans_chain_name(trans)) {
6398 rhltable_remove(&trans->ctx.table->chains_ht,
6399 &trans->ctx.chain->rhlhead,
6400 nft_chain_ht_params);
6401 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
6402 rhltable_insert_key(&trans->ctx.table->chains_ht,
6403 trans->ctx.chain->name,
6404 &trans->ctx.chain->rhlhead,
6405 nft_chain_ht_params);
6408 if (!nft_is_base_chain(trans->ctx.chain))
6411 nft_chain_stats_replace(trans);
6413 basechain = nft_base_chain(trans->ctx.chain);
6415 switch (nft_trans_chain_policy(trans)) {
6418 basechain->policy = nft_trans_chain_policy(trans);
6423 static void nft_commit_release(struct nft_trans *trans)
6425 switch (trans->msg_type) {
6426 case NFT_MSG_DELTABLE:
6427 nf_tables_table_destroy(&trans->ctx);
6429 case NFT_MSG_NEWCHAIN:
6430 free_percpu(nft_trans_chain_stats(trans));
6431 kfree(nft_trans_chain_name(trans));
6433 case NFT_MSG_DELCHAIN:
6434 nf_tables_chain_destroy(&trans->ctx);
6436 case NFT_MSG_DELRULE:
6437 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6439 case NFT_MSG_DELSET:
6440 nft_set_destroy(nft_trans_set(trans));
6442 case NFT_MSG_DELSETELEM:
6443 nf_tables_set_elem_destroy(&trans->ctx,
6444 nft_trans_elem_set(trans),
6445 nft_trans_elem(trans).priv);
6447 case NFT_MSG_DELOBJ:
6448 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6450 case NFT_MSG_DELFLOWTABLE:
6451 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6456 put_net(trans->ctx.net);
6461 static void nf_tables_trans_destroy_work(struct work_struct *w)
6463 struct nft_trans *trans, *next;
6466 spin_lock(&nf_tables_destroy_list_lock);
6467 list_splice_init(&nf_tables_destroy_list, &head);
6468 spin_unlock(&nf_tables_destroy_list_lock);
6470 if (list_empty(&head))
6475 list_for_each_entry_safe(trans, next, &head, list) {
6476 list_del(&trans->list);
6477 nft_commit_release(trans);
6481 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
6483 struct nft_rule *rule;
6484 unsigned int alloc = 0;
6487 /* already handled or inactive chain? */
6488 if (chain->rules_next || !nft_is_active_next(net, chain))
6491 rule = list_entry(&chain->rules, struct nft_rule, list);
6494 list_for_each_entry_continue(rule, &chain->rules, list) {
6495 if (nft_is_active_next(net, rule))
6499 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
6500 if (!chain->rules_next)
6503 list_for_each_entry_continue(rule, &chain->rules, list) {
6504 if (nft_is_active_next(net, rule))
6505 chain->rules_next[i++] = rule;
6508 chain->rules_next[i] = NULL;
6512 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
6514 struct nft_trans *trans, *next;
6516 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6517 struct nft_chain *chain = trans->ctx.chain;
6519 if (trans->msg_type == NFT_MSG_NEWRULE ||
6520 trans->msg_type == NFT_MSG_DELRULE) {
6521 kvfree(chain->rules_next);
6522 chain->rules_next = NULL;
6527 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
6529 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
6534 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
6536 struct nft_rule **r = rules;
6537 struct nft_rules_old *old;
6542 r++; /* rcu_head is after end marker */
6546 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
6549 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
6551 struct nft_rule **g0, **g1;
6554 next_genbit = nft_gencursor_next(net);
6556 g0 = rcu_dereference_protected(chain->rules_gen_0,
6557 lockdep_commit_lock_is_held(net));
6558 g1 = rcu_dereference_protected(chain->rules_gen_1,
6559 lockdep_commit_lock_is_held(net));
6561 /* No changes to this chain? */
6562 if (chain->rules_next == NULL) {
6563 /* chain had no change in last or next generation */
6567 * chain had no change in this generation; make sure next
6568 * one uses same rules as current generation.
6571 rcu_assign_pointer(chain->rules_gen_1, g0);
6572 nf_tables_commit_chain_free_rules_old(g1);
6574 rcu_assign_pointer(chain->rules_gen_0, g1);
6575 nf_tables_commit_chain_free_rules_old(g0);
6582 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
6584 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
6586 chain->rules_next = NULL;
6592 nf_tables_commit_chain_free_rules_old(g1);
6594 nf_tables_commit_chain_free_rules_old(g0);
6597 static void nft_obj_del(struct nft_object *obj)
6599 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
6600 list_del_rcu(&obj->list);
6603 static void nft_chain_del(struct nft_chain *chain)
6605 struct nft_table *table = chain->table;
6607 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
6608 nft_chain_ht_params));
6609 list_del_rcu(&chain->list);
6612 static void nf_tables_commit_release(struct net *net)
6614 struct nft_trans *trans;
6616 /* all side effects have to be made visible.
6617 * For example, if a chain named 'foo' has been deleted, a
6618 * new transaction must not find it anymore.
6620 * Memory reclaim happens asynchronously from work queue
6621 * to prevent expensive synchronize_rcu() in commit phase.
6623 if (list_empty(&net->nft.commit_list)) {
6624 mutex_unlock(&net->nft.commit_mutex);
6628 trans = list_last_entry(&net->nft.commit_list,
6629 struct nft_trans, list);
6630 get_net(trans->ctx.net);
6631 WARN_ON_ONCE(trans->put_net);
6633 trans->put_net = true;
6634 spin_lock(&nf_tables_destroy_list_lock);
6635 list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
6636 spin_unlock(&nf_tables_destroy_list_lock);
6638 mutex_unlock(&net->nft.commit_mutex);
6640 schedule_work(&trans_destroy_work);
6643 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
6645 struct nft_trans *trans, *next;
6646 struct nft_trans_elem *te;
6647 struct nft_chain *chain;
6648 struct nft_table *table;
6651 if (list_empty(&net->nft.commit_list)) {
6652 mutex_unlock(&net->nft.commit_mutex);
6656 /* 0. Validate ruleset, otherwise roll back for error reporting. */
6657 if (nf_tables_validate(net) < 0)
6660 err = nft_flow_rule_offload_commit(net);
6664 /* 1. Allocate space for next generation rules_gen_X[] */
6665 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6668 if (trans->msg_type == NFT_MSG_NEWRULE ||
6669 trans->msg_type == NFT_MSG_DELRULE) {
6670 chain = trans->ctx.chain;
6672 ret = nf_tables_commit_chain_prepare(net, chain);
6674 nf_tables_commit_chain_prepare_cancel(net);
6680 /* step 2. Make rules_gen_X visible to packet path */
6681 list_for_each_entry(table, &net->nft.tables, list) {
6682 list_for_each_entry(chain, &table->chains, list)
6683 nf_tables_commit_chain(net, chain);
6687 * Bump generation counter, invalidate any dump in progress.
6688 * Cannot fail after this point.
6690 while (++net->nft.base_seq == 0);
6692 /* step 3. Start new generation, rules_gen_X now in use. */
6693 net->nft.gencursor = nft_gencursor_next(net);
6695 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6696 switch (trans->msg_type) {
6697 case NFT_MSG_NEWTABLE:
6698 if (nft_trans_table_update(trans)) {
6699 if (!nft_trans_table_enable(trans)) {
6700 nf_tables_table_disable(net,
6702 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6705 nft_clear(net, trans->ctx.table);
6707 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
6708 nft_trans_destroy(trans);
6710 case NFT_MSG_DELTABLE:
6711 list_del_rcu(&trans->ctx.table->list);
6712 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
6714 case NFT_MSG_NEWCHAIN:
6715 if (nft_trans_chain_update(trans)) {
6716 nft_chain_commit_update(trans);
6717 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6718 /* trans destroyed after rcu grace period */
6720 nft_chain_commit_drop_policy(trans);
6721 nft_clear(net, trans->ctx.chain);
6722 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6723 nft_trans_destroy(trans);
6726 case NFT_MSG_DELCHAIN:
6727 nft_chain_del(trans->ctx.chain);
6728 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
6729 nf_tables_unregister_hook(trans->ctx.net,
6733 case NFT_MSG_NEWRULE:
6734 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6735 nf_tables_rule_notify(&trans->ctx,
6736 nft_trans_rule(trans),
6738 nft_trans_destroy(trans);
6740 case NFT_MSG_DELRULE:
6741 list_del_rcu(&nft_trans_rule(trans)->list);
6742 nf_tables_rule_notify(&trans->ctx,
6743 nft_trans_rule(trans),
6745 nft_rule_expr_deactivate(&trans->ctx,
6746 nft_trans_rule(trans),
6749 case NFT_MSG_NEWSET:
6750 nft_clear(net, nft_trans_set(trans));
6751 /* This avoids hitting -EBUSY when deleting the table
6752 * from the transaction.
6754 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
6755 !list_empty(&nft_trans_set(trans)->bindings))
6756 trans->ctx.table->use--;
6758 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6759 NFT_MSG_NEWSET, GFP_KERNEL);
6760 nft_trans_destroy(trans);
6762 case NFT_MSG_DELSET:
6763 list_del_rcu(&nft_trans_set(trans)->list);
6764 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6765 NFT_MSG_DELSET, GFP_KERNEL);
6767 case NFT_MSG_NEWSETELEM:
6768 te = (struct nft_trans_elem *)trans->data;
6770 te->set->ops->activate(net, te->set, &te->elem);
6771 nf_tables_setelem_notify(&trans->ctx, te->set,
6773 NFT_MSG_NEWSETELEM, 0);
6774 nft_trans_destroy(trans);
6776 case NFT_MSG_DELSETELEM:
6777 te = (struct nft_trans_elem *)trans->data;
6779 nf_tables_setelem_notify(&trans->ctx, te->set,
6781 NFT_MSG_DELSETELEM, 0);
6782 te->set->ops->remove(net, te->set, &te->elem);
6783 atomic_dec(&te->set->nelems);
6786 case NFT_MSG_NEWOBJ:
6787 nft_clear(net, nft_trans_obj(trans));
6788 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6790 nft_trans_destroy(trans);
6792 case NFT_MSG_DELOBJ:
6793 nft_obj_del(nft_trans_obj(trans));
6794 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6797 case NFT_MSG_NEWFLOWTABLE:
6798 nft_clear(net, nft_trans_flowtable(trans));
6799 nf_tables_flowtable_notify(&trans->ctx,
6800 nft_trans_flowtable(trans),
6801 NFT_MSG_NEWFLOWTABLE);
6802 nft_trans_destroy(trans);
6804 case NFT_MSG_DELFLOWTABLE:
6805 list_del_rcu(&nft_trans_flowtable(trans)->list);
6806 nf_tables_flowtable_notify(&trans->ctx,
6807 nft_trans_flowtable(trans),
6808 NFT_MSG_DELFLOWTABLE);
6809 nft_unregister_flowtable_net_hooks(net,
6810 nft_trans_flowtable(trans));
6815 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
6816 nf_tables_commit_release(net);
6821 static void nf_tables_abort_release(struct nft_trans *trans)
6823 switch (trans->msg_type) {
6824 case NFT_MSG_NEWTABLE:
6825 nf_tables_table_destroy(&trans->ctx);
6827 case NFT_MSG_NEWCHAIN:
6828 nf_tables_chain_destroy(&trans->ctx);
6830 case NFT_MSG_NEWRULE:
6831 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6833 case NFT_MSG_NEWSET:
6834 nft_set_destroy(nft_trans_set(trans));
6836 case NFT_MSG_NEWSETELEM:
6837 nft_set_elem_destroy(nft_trans_elem_set(trans),
6838 nft_trans_elem(trans).priv, true);
6840 case NFT_MSG_NEWOBJ:
6841 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6843 case NFT_MSG_NEWFLOWTABLE:
6844 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6850 static int __nf_tables_abort(struct net *net)
6852 struct nft_trans *trans, *next;
6853 struct nft_trans_elem *te;
6855 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
6857 switch (trans->msg_type) {
6858 case NFT_MSG_NEWTABLE:
6859 if (nft_trans_table_update(trans)) {
6860 if (nft_trans_table_enable(trans)) {
6861 nf_tables_table_disable(net,
6863 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6865 nft_trans_destroy(trans);
6867 list_del_rcu(&trans->ctx.table->list);
6870 case NFT_MSG_DELTABLE:
6871 nft_clear(trans->ctx.net, trans->ctx.table);
6872 nft_trans_destroy(trans);
6874 case NFT_MSG_NEWCHAIN:
6875 if (nft_trans_chain_update(trans)) {
6876 free_percpu(nft_trans_chain_stats(trans));
6877 kfree(nft_trans_chain_name(trans));
6878 nft_trans_destroy(trans);
6880 trans->ctx.table->use--;
6881 nft_chain_del(trans->ctx.chain);
6882 nf_tables_unregister_hook(trans->ctx.net,
6887 case NFT_MSG_DELCHAIN:
6888 trans->ctx.table->use++;
6889 nft_clear(trans->ctx.net, trans->ctx.chain);
6890 nft_trans_destroy(trans);
6892 case NFT_MSG_NEWRULE:
6893 trans->ctx.chain->use--;
6894 list_del_rcu(&nft_trans_rule(trans)->list);
6895 nft_rule_expr_deactivate(&trans->ctx,
6896 nft_trans_rule(trans),
6899 case NFT_MSG_DELRULE:
6900 trans->ctx.chain->use++;
6901 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6902 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
6903 nft_trans_destroy(trans);
6905 case NFT_MSG_NEWSET:
6906 trans->ctx.table->use--;
6907 if (nft_trans_set(trans)->bound) {
6908 nft_trans_destroy(trans);
6911 list_del_rcu(&nft_trans_set(trans)->list);
6913 case NFT_MSG_DELSET:
6914 trans->ctx.table->use++;
6915 nft_clear(trans->ctx.net, nft_trans_set(trans));
6916 nft_trans_destroy(trans);
6918 case NFT_MSG_NEWSETELEM:
6919 if (nft_trans_elem_set(trans)->bound) {
6920 nft_trans_destroy(trans);
6923 te = (struct nft_trans_elem *)trans->data;
6924 te->set->ops->remove(net, te->set, &te->elem);
6925 atomic_dec(&te->set->nelems);
6927 case NFT_MSG_DELSETELEM:
6928 te = (struct nft_trans_elem *)trans->data;
6930 nft_set_elem_activate(net, te->set, &te->elem);
6931 te->set->ops->activate(net, te->set, &te->elem);
6934 nft_trans_destroy(trans);
6936 case NFT_MSG_NEWOBJ:
6937 trans->ctx.table->use--;
6938 nft_obj_del(nft_trans_obj(trans));
6940 case NFT_MSG_DELOBJ:
6941 trans->ctx.table->use++;
6942 nft_clear(trans->ctx.net, nft_trans_obj(trans));
6943 nft_trans_destroy(trans);
6945 case NFT_MSG_NEWFLOWTABLE:
6946 trans->ctx.table->use--;
6947 list_del_rcu(&nft_trans_flowtable(trans)->list);
6948 nft_unregister_flowtable_net_hooks(net,
6949 nft_trans_flowtable(trans));
6951 case NFT_MSG_DELFLOWTABLE:
6952 trans->ctx.table->use++;
6953 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
6954 nft_trans_destroy(trans);
6961 list_for_each_entry_safe_reverse(trans, next,
6962 &net->nft.commit_list, list) {
6963 list_del(&trans->list);
6964 nf_tables_abort_release(trans);
6970 static void nf_tables_cleanup(struct net *net)
6972 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
6975 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
6977 int ret = __nf_tables_abort(net);
6979 mutex_unlock(&net->nft.commit_mutex);
6984 static bool nf_tables_valid_genid(struct net *net, u32 genid)
6988 mutex_lock(&net->nft.commit_mutex);
6990 genid_ok = genid == 0 || net->nft.base_seq == genid;
6992 mutex_unlock(&net->nft.commit_mutex);
6994 /* else, commit mutex has to be released by commit or abort function */
6998 static const struct nfnetlink_subsystem nf_tables_subsys = {
6999 .name = "nf_tables",
7000 .subsys_id = NFNL_SUBSYS_NFTABLES,
7001 .cb_count = NFT_MSG_MAX,
7003 .commit = nf_tables_commit,
7004 .abort = nf_tables_abort,
7005 .cleanup = nf_tables_cleanup,
7006 .valid_genid = nf_tables_valid_genid,
7007 .owner = THIS_MODULE,
7010 int nft_chain_validate_dependency(const struct nft_chain *chain,
7011 enum nft_chain_types type)
7013 const struct nft_base_chain *basechain;
7015 if (nft_is_base_chain(chain)) {
7016 basechain = nft_base_chain(chain);
7017 if (basechain->type->type != type)
7022 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
7024 int nft_chain_validate_hooks(const struct nft_chain *chain,
7025 unsigned int hook_flags)
7027 struct nft_base_chain *basechain;
7029 if (nft_is_base_chain(chain)) {
7030 basechain = nft_base_chain(chain);
7032 if ((1 << basechain->ops.hooknum) & hook_flags)
7040 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
7043 * Loop detection - walk through the ruleset beginning at the destination chain
7044 * of a new jump until either the source chain is reached (loop) or all
7045 * reachable chains have been traversed.
7047 * The loop check is performed whenever a new jump verdict is added to an
7048 * expression or verdict map or a verdict map is bound to a new chain.
7051 static int nf_tables_check_loops(const struct nft_ctx *ctx,
7052 const struct nft_chain *chain);
7054 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
7055 struct nft_set *set,
7056 const struct nft_set_iter *iter,
7057 struct nft_set_elem *elem)
7059 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
7060 const struct nft_data *data;
7062 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
7063 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
7066 data = nft_set_ext_data(ext);
7067 switch (data->verdict.code) {
7070 return nf_tables_check_loops(ctx, data->verdict.chain);
7076 static int nf_tables_check_loops(const struct nft_ctx *ctx,
7077 const struct nft_chain *chain)
7079 const struct nft_rule *rule;
7080 const struct nft_expr *expr, *last;
7081 struct nft_set *set;
7082 struct nft_set_binding *binding;
7083 struct nft_set_iter iter;
7085 if (ctx->chain == chain)
7088 list_for_each_entry(rule, &chain->rules, list) {
7089 nft_rule_for_each_expr(expr, last, rule) {
7090 struct nft_immediate_expr *priv;
7091 const struct nft_data *data;
7094 if (strcmp(expr->ops->type->name, "immediate"))
7097 priv = nft_expr_priv(expr);
7098 if (priv->dreg != NFT_REG_VERDICT)
7102 switch (data->verdict.code) {
7105 err = nf_tables_check_loops(ctx,
7106 data->verdict.chain);
7115 list_for_each_entry(set, &ctx->table->sets, list) {
7116 if (!nft_is_active_next(ctx->net, set))
7118 if (!(set->flags & NFT_SET_MAP) ||
7119 set->dtype != NFT_DATA_VERDICT)
7122 list_for_each_entry(binding, &set->bindings, list) {
7123 if (!(binding->flags & NFT_SET_MAP) ||
7124 binding->chain != chain)
7127 iter.genmask = nft_genmask_next(ctx->net);
7131 iter.fn = nf_tables_loop_check_setelem;
7133 set->ops->walk(ctx, set, &iter);
7143 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
7145 * @attr: netlink attribute to fetch value from
7146 * @max: maximum value to be stored in dest
7147 * @dest: pointer to the variable
7149 * Parse, check and store a given u32 netlink attribute into variable.
7150 * This function returns -ERANGE if the value goes over maximum value.
7151 * Otherwise a 0 is returned and the attribute value is stored in the
7152 * destination variable.
7154 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
7158 val = ntohl(nla_get_be32(attr));
7165 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
7168 * nft_parse_register - parse a register value from a netlink attribute
7170 * @attr: netlink attribute
7172 * Parse and translate a register value from a netlink attribute.
7173 * Registers used to be 128 bit wide, these register numbers will be
7174 * mapped to the corresponding 32 bit register numbers.
7176 unsigned int nft_parse_register(const struct nlattr *attr)
7180 reg = ntohl(nla_get_be32(attr));
7182 case NFT_REG_VERDICT...NFT_REG_4:
7183 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
7185 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
7188 EXPORT_SYMBOL_GPL(nft_parse_register);
7191 * nft_dump_register - dump a register value to a netlink attribute
7193 * @skb: socket buffer
7194 * @attr: attribute number
7195 * @reg: register number
7197 * Construct a netlink attribute containing the register number. For
7198 * compatibility reasons, register numbers being a multiple of 4 are
7199 * translated to the corresponding 128 bit register numbers.
7201 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
7203 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
7204 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
7206 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
7208 return nla_put_be32(skb, attr, htonl(reg));
7210 EXPORT_SYMBOL_GPL(nft_dump_register);
7213 * nft_validate_register_load - validate a load from a register
7215 * @reg: the register number
7216 * @len: the length of the data
7218 * Validate that the input register is one of the general purpose
7219 * registers and that the length of the load is within the bounds.
7221 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
7223 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7227 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
7232 EXPORT_SYMBOL_GPL(nft_validate_register_load);
7235 * nft_validate_register_store - validate an expressions' register store
7237 * @ctx: context of the expression performing the load
7238 * @reg: the destination register number
7239 * @data: the data to load
7240 * @type: the data type
7241 * @len: the length of the data
7243 * Validate that a data load uses the appropriate data type for
7244 * the destination register and the length is within the bounds.
7245 * A value of NULL for the data means that its runtime gathered
7248 int nft_validate_register_store(const struct nft_ctx *ctx,
7249 enum nft_registers reg,
7250 const struct nft_data *data,
7251 enum nft_data_types type, unsigned int len)
7256 case NFT_REG_VERDICT:
7257 if (type != NFT_DATA_VERDICT)
7261 (data->verdict.code == NFT_GOTO ||
7262 data->verdict.code == NFT_JUMP)) {
7263 err = nf_tables_check_loops(ctx, data->verdict.chain);
7270 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7274 if (reg * NFT_REG32_SIZE + len >
7275 FIELD_SIZEOF(struct nft_regs, data))
7278 if (data != NULL && type != NFT_DATA_VALUE)
7283 EXPORT_SYMBOL_GPL(nft_validate_register_store);
7285 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
7286 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
7287 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
7288 .len = NFT_CHAIN_MAXNAMELEN - 1 },
7291 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
7292 struct nft_data_desc *desc, const struct nlattr *nla)
7294 u8 genmask = nft_genmask_next(ctx->net);
7295 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
7296 struct nft_chain *chain;
7299 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
7300 nft_verdict_policy, NULL);
7304 if (!tb[NFTA_VERDICT_CODE])
7306 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
7308 switch (data->verdict.code) {
7310 switch (data->verdict.code & NF_VERDICT_MASK) {
7325 if (!tb[NFTA_VERDICT_CHAIN])
7327 chain = nft_chain_lookup(ctx->net, ctx->table,
7328 tb[NFTA_VERDICT_CHAIN], genmask);
7330 return PTR_ERR(chain);
7331 if (nft_is_base_chain(chain))
7335 data->verdict.chain = chain;
7339 desc->len = sizeof(data->verdict);
7340 desc->type = NFT_DATA_VERDICT;
7344 static void nft_verdict_uninit(const struct nft_data *data)
7346 switch (data->verdict.code) {
7349 data->verdict.chain->use--;
7354 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
7356 struct nlattr *nest;
7358 nest = nla_nest_start_noflag(skb, type);
7360 goto nla_put_failure;
7362 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
7363 goto nla_put_failure;
7368 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
7370 goto nla_put_failure;
7372 nla_nest_end(skb, nest);
7379 static int nft_value_init(const struct nft_ctx *ctx,
7380 struct nft_data *data, unsigned int size,
7381 struct nft_data_desc *desc, const struct nlattr *nla)
7391 nla_memcpy(data->data, nla, len);
7392 desc->type = NFT_DATA_VALUE;
7397 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
7400 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
7403 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
7404 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
7405 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
7409 * nft_data_init - parse nf_tables data netlink attributes
7411 * @ctx: context of the expression using the data
7412 * @data: destination struct nft_data
7413 * @size: maximum data length
7414 * @desc: data description
7415 * @nla: netlink attribute containing data
7417 * Parse the netlink data attributes and initialize a struct nft_data.
7418 * The type and length of data are returned in the data description.
7420 * The caller can indicate that it only wants to accept data of type
7421 * NFT_DATA_VALUE by passing NULL for the ctx argument.
7423 int nft_data_init(const struct nft_ctx *ctx,
7424 struct nft_data *data, unsigned int size,
7425 struct nft_data_desc *desc, const struct nlattr *nla)
7427 struct nlattr *tb[NFTA_DATA_MAX + 1];
7430 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
7431 nft_data_policy, NULL);
7435 if (tb[NFTA_DATA_VALUE])
7436 return nft_value_init(ctx, data, size, desc,
7437 tb[NFTA_DATA_VALUE]);
7438 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
7439 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
7442 EXPORT_SYMBOL_GPL(nft_data_init);
7445 * nft_data_release - release a nft_data item
7447 * @data: struct nft_data to release
7448 * @type: type of data
7450 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7451 * all others need to be released by calling this function.
7453 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
7455 if (type < NFT_DATA_VERDICT)
7458 case NFT_DATA_VERDICT:
7459 return nft_verdict_uninit(data);
7464 EXPORT_SYMBOL_GPL(nft_data_release);
7466 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
7467 enum nft_data_types type, unsigned int len)
7469 struct nlattr *nest;
7472 nest = nla_nest_start_noflag(skb, attr);
7477 case NFT_DATA_VALUE:
7478 err = nft_value_dump(skb, data, len);
7480 case NFT_DATA_VERDICT:
7481 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
7488 nla_nest_end(skb, nest);
7491 EXPORT_SYMBOL_GPL(nft_data_dump);
7493 int __nft_release_basechain(struct nft_ctx *ctx)
7495 struct nft_rule *rule, *nr;
7497 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
7500 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
7501 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
7502 list_del(&rule->list);
7504 nf_tables_rule_release(ctx, rule);
7506 nft_chain_del(ctx->chain);
7508 nf_tables_chain_destroy(ctx);
7512 EXPORT_SYMBOL_GPL(__nft_release_basechain);
7514 static void __nft_release_tables(struct net *net)
7516 struct nft_flowtable *flowtable, *nf;
7517 struct nft_table *table, *nt;
7518 struct nft_chain *chain, *nc;
7519 struct nft_object *obj, *ne;
7520 struct nft_rule *rule, *nr;
7521 struct nft_set *set, *ns;
7522 struct nft_ctx ctx = {
7524 .family = NFPROTO_NETDEV,
7527 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
7528 ctx.family = table->family;
7530 list_for_each_entry(chain, &table->chains, list)
7531 nf_tables_unregister_hook(net, table, chain);
7532 /* No packets are walking on these chains anymore. */
7534 list_for_each_entry(chain, &table->chains, list) {
7536 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
7537 list_del(&rule->list);
7539 nf_tables_rule_release(&ctx, rule);
7542 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
7543 list_del(&flowtable->list);
7545 nf_tables_flowtable_destroy(flowtable);
7547 list_for_each_entry_safe(set, ns, &table->sets, list) {
7548 list_del(&set->list);
7550 nft_set_destroy(set);
7552 list_for_each_entry_safe(obj, ne, &table->objects, list) {
7555 nft_obj_destroy(&ctx, obj);
7557 list_for_each_entry_safe(chain, nc, &table->chains, list) {
7559 nft_chain_del(chain);
7561 nf_tables_chain_destroy(&ctx);
7563 list_del(&table->list);
7564 nf_tables_table_destroy(&ctx);
7568 static int __net_init nf_tables_init_net(struct net *net)
7570 INIT_LIST_HEAD(&net->nft.tables);
7571 INIT_LIST_HEAD(&net->nft.commit_list);
7572 mutex_init(&net->nft.commit_mutex);
7573 net->nft.base_seq = 1;
7574 net->nft.validate_state = NFT_VALIDATE_SKIP;
7579 static void __net_exit nf_tables_exit_net(struct net *net)
7581 mutex_lock(&net->nft.commit_mutex);
7582 if (!list_empty(&net->nft.commit_list))
7583 __nf_tables_abort(net);
7584 __nft_release_tables(net);
7585 mutex_unlock(&net->nft.commit_mutex);
7586 WARN_ON_ONCE(!list_empty(&net->nft.tables));
7589 static struct pernet_operations nf_tables_net_ops = {
7590 .init = nf_tables_init_net,
7591 .exit = nf_tables_exit_net,
7594 static int __init nf_tables_module_init(void)
7598 spin_lock_init(&nf_tables_destroy_list_lock);
7599 err = register_pernet_subsys(&nf_tables_net_ops);
7603 err = nft_chain_filter_init();
7607 err = nf_tables_core_module_init();
7611 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
7615 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
7620 err = nfnetlink_subsys_register(&nf_tables_subsys);
7624 nft_chain_route_init();
7627 rhltable_destroy(&nft_objname_ht);
7629 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7631 nf_tables_core_module_exit();
7633 nft_chain_filter_fini();
7635 unregister_pernet_subsys(&nf_tables_net_ops);
7639 static void __exit nf_tables_module_exit(void)
7641 nfnetlink_subsys_unregister(&nf_tables_subsys);
7642 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7643 nft_chain_filter_fini();
7644 nft_chain_route_fini();
7645 unregister_pernet_subsys(&nf_tables_net_ops);
7646 cancel_work_sync(&trans_destroy_work);
7648 rhltable_destroy(&nft_objname_ht);
7649 nf_tables_core_module_exit();
7652 module_init(nf_tables_module_init);
7653 module_exit(nf_tables_module_exit);
7655 MODULE_LICENSE("GPL");
7656 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
7657 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);