2 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/list.h>
14 #include <linux/skbuff.h>
15 #include <linux/netlink.h>
16 #include <linux/vmalloc.h>
17 #include <linux/rhashtable.h>
18 #include <linux/netfilter.h>
19 #include <linux/netfilter/nfnetlink.h>
20 #include <linux/netfilter/nf_tables.h>
21 #include <net/netfilter/nf_flow_table.h>
22 #include <net/netfilter/nf_tables_core.h>
23 #include <net/netfilter/nf_tables.h>
24 #include <net/net_namespace.h>
27 static LIST_HEAD(nf_tables_expressions);
28 static LIST_HEAD(nf_tables_objects);
29 static LIST_HEAD(nf_tables_flowtables);
30 static u64 table_handle;
33 NFT_VALIDATE_SKIP = 0,
38 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
39 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
40 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
42 static const struct rhashtable_params nft_chain_ht_params = {
43 .head_offset = offsetof(struct nft_chain, rhlhead),
44 .key_offset = offsetof(struct nft_chain, name),
45 .hashfn = nft_chain_hash,
46 .obj_hashfn = nft_chain_hash_obj,
47 .obj_cmpfn = nft_chain_hash_cmp,
49 .automatic_shrinking = true,
52 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
54 switch (net->nft.validate_state) {
55 case NFT_VALIDATE_SKIP:
56 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
58 case NFT_VALIDATE_NEED:
61 if (new_validate_state == NFT_VALIDATE_NEED)
65 net->nft.validate_state = new_validate_state;
68 static void nft_ctx_init(struct nft_ctx *ctx,
70 const struct sk_buff *skb,
71 const struct nlmsghdr *nlh,
73 struct nft_table *table,
74 struct nft_chain *chain,
75 const struct nlattr * const *nla)
82 ctx->portid = NETLINK_CB(skb).portid;
83 ctx->report = nlmsg_report(nlh);
84 ctx->seq = nlh->nlmsg_seq;
87 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
88 int msg_type, u32 size, gfp_t gfp)
90 struct nft_trans *trans;
92 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
96 trans->msg_type = msg_type;
102 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
103 int msg_type, u32 size)
105 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
108 static void nft_trans_destroy(struct nft_trans *trans)
110 list_del(&trans->list);
114 static int nf_tables_register_hook(struct net *net,
115 const struct nft_table *table,
116 struct nft_chain *chain)
118 const struct nft_base_chain *basechain;
119 const struct nf_hook_ops *ops;
121 if (table->flags & NFT_TABLE_F_DORMANT ||
122 !nft_is_base_chain(chain))
125 basechain = nft_base_chain(chain);
126 ops = &basechain->ops;
128 if (basechain->type->ops_register)
129 return basechain->type->ops_register(net, ops);
131 return nf_register_net_hook(net, ops);
134 static void nf_tables_unregister_hook(struct net *net,
135 const struct nft_table *table,
136 struct nft_chain *chain)
138 const struct nft_base_chain *basechain;
139 const struct nf_hook_ops *ops;
141 if (table->flags & NFT_TABLE_F_DORMANT ||
142 !nft_is_base_chain(chain))
144 basechain = nft_base_chain(chain);
145 ops = &basechain->ops;
147 if (basechain->type->ops_unregister)
148 return basechain->type->ops_unregister(net, ops);
150 nf_unregister_net_hook(net, ops);
153 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
155 struct nft_trans *trans;
157 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
161 if (msg_type == NFT_MSG_NEWTABLE)
162 nft_activate_next(ctx->net, ctx->table);
164 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
168 static int nft_deltable(struct nft_ctx *ctx)
172 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
176 nft_deactivate_next(ctx->net, ctx->table);
180 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
182 struct nft_trans *trans;
184 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
188 if (msg_type == NFT_MSG_NEWCHAIN)
189 nft_activate_next(ctx->net, ctx->chain);
191 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
195 static int nft_delchain(struct nft_ctx *ctx)
199 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
204 nft_deactivate_next(ctx->net, ctx->chain);
209 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
210 struct nft_rule *rule)
212 struct nft_expr *expr;
214 expr = nft_expr_first(rule);
215 while (expr != nft_expr_last(rule) && expr->ops) {
216 if (expr->ops->activate)
217 expr->ops->activate(ctx, expr);
219 expr = nft_expr_next(expr);
223 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
224 struct nft_rule *rule)
226 struct nft_expr *expr;
228 expr = nft_expr_first(rule);
229 while (expr != nft_expr_last(rule) && expr->ops) {
230 if (expr->ops->deactivate)
231 expr->ops->deactivate(ctx, expr);
233 expr = nft_expr_next(expr);
238 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
240 /* You cannot delete the same rule twice */
241 if (nft_is_active_next(ctx->net, rule)) {
242 nft_deactivate_next(ctx->net, rule);
249 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
250 struct nft_rule *rule)
252 struct nft_trans *trans;
254 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
258 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
259 nft_trans_rule_id(trans) =
260 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
262 nft_trans_rule(trans) = rule;
263 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
268 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
270 struct nft_trans *trans;
273 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
277 err = nf_tables_delrule_deactivate(ctx, rule);
279 nft_trans_destroy(trans);
282 nft_rule_expr_deactivate(ctx, rule);
287 static int nft_delrule_by_chain(struct nft_ctx *ctx)
289 struct nft_rule *rule;
292 list_for_each_entry(rule, &ctx->chain->rules, list) {
293 err = nft_delrule(ctx, rule);
300 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
303 struct nft_trans *trans;
305 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
309 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
310 nft_trans_set_id(trans) =
311 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
312 nft_activate_next(ctx->net, set);
314 nft_trans_set(trans) = set;
315 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
320 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
324 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
328 nft_deactivate_next(ctx->net, set);
334 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
335 struct nft_object *obj)
337 struct nft_trans *trans;
339 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
343 if (msg_type == NFT_MSG_NEWOBJ)
344 nft_activate_next(ctx->net, obj);
346 nft_trans_obj(trans) = obj;
347 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
352 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
356 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
360 nft_deactivate_next(ctx->net, obj);
366 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
367 struct nft_flowtable *flowtable)
369 struct nft_trans *trans;
371 trans = nft_trans_alloc(ctx, msg_type,
372 sizeof(struct nft_trans_flowtable));
376 if (msg_type == NFT_MSG_NEWFLOWTABLE)
377 nft_activate_next(ctx->net, flowtable);
379 nft_trans_flowtable(trans) = flowtable;
380 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
385 static int nft_delflowtable(struct nft_ctx *ctx,
386 struct nft_flowtable *flowtable)
390 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
394 nft_deactivate_next(ctx->net, flowtable);
404 static struct nft_table *nft_table_lookup(const struct net *net,
405 const struct nlattr *nla,
406 u8 family, u8 genmask)
408 struct nft_table *table;
411 return ERR_PTR(-EINVAL);
413 list_for_each_entry_rcu(table, &net->nft.tables, list) {
414 if (!nla_strcmp(nla, table->name) &&
415 table->family == family &&
416 nft_active_genmask(table, genmask))
420 return ERR_PTR(-ENOENT);
423 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
424 const struct nlattr *nla,
427 struct nft_table *table;
429 list_for_each_entry(table, &net->nft.tables, list) {
430 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
431 nft_active_genmask(table, genmask))
435 return ERR_PTR(-ENOENT);
438 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
440 return ++table->hgenerator;
443 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
445 static const struct nft_chain_type *
446 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
450 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
451 if (chain_type[family][i] != NULL &&
452 !nla_strcmp(nla, chain_type[family][i]->name))
453 return chain_type[family][i];
459 * Loading a module requires dropping mutex that guards the
461 * We first need to abort any pending transactions as once
462 * mutex is unlocked a different client could start a new
463 * transaction. It must not see any 'future generation'
464 * changes * as these changes will never happen.
466 #ifdef CONFIG_MODULES
467 static int __nf_tables_abort(struct net *net);
469 static void nft_request_module(struct net *net, const char *fmt, ...)
471 char module_name[MODULE_NAME_LEN];
475 __nf_tables_abort(net);
478 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
480 if (WARN(ret >= MODULE_NAME_LEN, "truncated: '%s' (len %d)", module_name, ret))
483 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
484 request_module("%s", module_name);
485 nfnl_lock(NFNL_SUBSYS_NFTABLES);
489 static const struct nft_chain_type *
490 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
491 u8 family, bool autoload)
493 const struct nft_chain_type *type;
495 type = __nf_tables_chain_type_lookup(nla, family);
498 #ifdef CONFIG_MODULES
500 nft_request_module(net, "nft-chain-%u-%.*s", family,
501 nla_len(nla), (const char *)nla_data(nla));
502 type = __nf_tables_chain_type_lookup(nla, family);
504 return ERR_PTR(-EAGAIN);
507 return ERR_PTR(-ENOENT);
510 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
511 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
512 .len = NFT_TABLE_MAXNAMELEN - 1 },
513 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
514 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
517 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
518 u32 portid, u32 seq, int event, u32 flags,
519 int family, const struct nft_table *table)
521 struct nlmsghdr *nlh;
522 struct nfgenmsg *nfmsg;
524 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
525 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
527 goto nla_put_failure;
529 nfmsg = nlmsg_data(nlh);
530 nfmsg->nfgen_family = family;
531 nfmsg->version = NFNETLINK_V0;
532 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
534 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
535 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
536 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
537 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
539 goto nla_put_failure;
545 nlmsg_trim(skb, nlh);
549 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
555 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
558 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
562 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
563 event, 0, ctx->family, ctx->table);
569 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
570 ctx->report, GFP_KERNEL);
573 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
576 static int nf_tables_dump_tables(struct sk_buff *skb,
577 struct netlink_callback *cb)
579 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
580 const struct nft_table *table;
581 unsigned int idx = 0, s_idx = cb->args[0];
582 struct net *net = sock_net(skb->sk);
583 int family = nfmsg->nfgen_family;
586 cb->seq = net->nft.base_seq;
588 list_for_each_entry_rcu(table, &net->nft.tables, list) {
589 if (family != NFPROTO_UNSPEC && family != table->family)
595 memset(&cb->args[1], 0,
596 sizeof(cb->args) - sizeof(cb->args[0]));
597 if (!nft_is_active(net, table))
599 if (nf_tables_fill_table_info(skb, net,
600 NETLINK_CB(cb->skb).portid,
602 NFT_MSG_NEWTABLE, NLM_F_MULTI,
603 table->family, table) < 0)
606 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
616 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
617 const struct nlmsghdr *nlh,
618 struct netlink_dump_control *c)
622 if (!try_module_get(THIS_MODULE))
626 err = netlink_dump_start(nlsk, skb, nlh, c);
628 module_put(THIS_MODULE);
633 /* called with rcu_read_lock held */
634 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
635 struct sk_buff *skb, const struct nlmsghdr *nlh,
636 const struct nlattr * const nla[],
637 struct netlink_ext_ack *extack)
639 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
640 u8 genmask = nft_genmask_cur(net);
641 const struct nft_table *table;
642 struct sk_buff *skb2;
643 int family = nfmsg->nfgen_family;
646 if (nlh->nlmsg_flags & NLM_F_DUMP) {
647 struct netlink_dump_control c = {
648 .dump = nf_tables_dump_tables,
649 .module = THIS_MODULE,
652 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
655 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
657 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
658 return PTR_ERR(table);
661 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
665 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
666 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
671 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
678 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
680 struct nft_chain *chain;
683 list_for_each_entry(chain, &table->chains, list) {
684 if (!nft_is_active_next(net, chain))
686 if (!nft_is_base_chain(chain))
689 if (cnt && i++ == cnt)
692 nf_unregister_net_hook(net, &nft_base_chain(chain)->ops);
696 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
698 struct nft_chain *chain;
701 list_for_each_entry(chain, &table->chains, list) {
702 if (!nft_is_active_next(net, chain))
704 if (!nft_is_base_chain(chain))
707 err = nf_register_net_hook(net, &nft_base_chain(chain)->ops);
716 nft_table_disable(net, table, i);
720 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
722 nft_table_disable(net, table, 0);
725 static int nf_tables_updtable(struct nft_ctx *ctx)
727 struct nft_trans *trans;
731 if (!ctx->nla[NFTA_TABLE_FLAGS])
734 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
735 if (flags & ~NFT_TABLE_F_DORMANT)
738 if (flags == ctx->table->flags)
741 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
742 sizeof(struct nft_trans_table));
746 if ((flags & NFT_TABLE_F_DORMANT) &&
747 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
748 nft_trans_table_enable(trans) = false;
749 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
750 ctx->table->flags & NFT_TABLE_F_DORMANT) {
751 ret = nf_tables_table_enable(ctx->net, ctx->table);
753 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
754 nft_trans_table_enable(trans) = true;
760 nft_trans_table_update(trans) = true;
761 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
764 nft_trans_destroy(trans);
768 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
770 const char *name = data;
772 return jhash(name, strlen(name), seed);
775 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
777 const struct nft_chain *chain = data;
779 return nft_chain_hash(chain->name, 0, seed);
782 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
785 const struct nft_chain *chain = ptr;
786 const char *name = arg->key;
788 return strcmp(chain->name, name);
791 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
792 struct sk_buff *skb, const struct nlmsghdr *nlh,
793 const struct nlattr * const nla[],
794 struct netlink_ext_ack *extack)
796 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
797 u8 genmask = nft_genmask_next(net);
798 int family = nfmsg->nfgen_family;
799 const struct nlattr *attr;
800 struct nft_table *table;
805 attr = nla[NFTA_TABLE_NAME];
806 table = nft_table_lookup(net, attr, family, genmask);
808 if (PTR_ERR(table) != -ENOENT)
809 return PTR_ERR(table);
811 if (nlh->nlmsg_flags & NLM_F_EXCL) {
812 NL_SET_BAD_ATTR(extack, attr);
815 if (nlh->nlmsg_flags & NLM_F_REPLACE)
818 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
819 return nf_tables_updtable(&ctx);
822 if (nla[NFTA_TABLE_FLAGS]) {
823 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
824 if (flags & ~NFT_TABLE_F_DORMANT)
829 table = kzalloc(sizeof(*table), GFP_KERNEL);
833 table->name = nla_strdup(attr, GFP_KERNEL);
834 if (table->name == NULL)
837 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
841 INIT_LIST_HEAD(&table->chains);
842 INIT_LIST_HEAD(&table->sets);
843 INIT_LIST_HEAD(&table->objects);
844 INIT_LIST_HEAD(&table->flowtables);
845 table->family = family;
846 table->flags = flags;
847 table->handle = ++table_handle;
849 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
850 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
854 list_add_tail_rcu(&table->list, &net->nft.tables);
857 rhltable_destroy(&table->chains_ht);
866 static int nft_flush_table(struct nft_ctx *ctx)
868 struct nft_flowtable *flowtable, *nft;
869 struct nft_chain *chain, *nc;
870 struct nft_object *obj, *ne;
871 struct nft_set *set, *ns;
874 list_for_each_entry(chain, &ctx->table->chains, list) {
875 if (!nft_is_active_next(ctx->net, chain))
880 err = nft_delrule_by_chain(ctx);
885 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
886 if (!nft_is_active_next(ctx->net, set))
889 if (nft_set_is_anonymous(set) &&
890 !list_empty(&set->bindings))
893 err = nft_delset(ctx, set);
898 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
899 err = nft_delflowtable(ctx, flowtable);
904 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
905 err = nft_delobj(ctx, obj);
910 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
911 if (!nft_is_active_next(ctx->net, chain))
916 err = nft_delchain(ctx);
921 err = nft_deltable(ctx);
926 static int nft_flush(struct nft_ctx *ctx, int family)
928 struct nft_table *table, *nt;
929 const struct nlattr * const *nla = ctx->nla;
932 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
933 if (family != AF_UNSPEC && table->family != family)
936 ctx->family = table->family;
938 if (!nft_is_active_next(ctx->net, table))
941 if (nla[NFTA_TABLE_NAME] &&
942 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
947 err = nft_flush_table(ctx);
955 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
956 struct sk_buff *skb, const struct nlmsghdr *nlh,
957 const struct nlattr * const nla[],
958 struct netlink_ext_ack *extack)
960 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
961 u8 genmask = nft_genmask_next(net);
962 int family = nfmsg->nfgen_family;
963 const struct nlattr *attr;
964 struct nft_table *table;
967 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
968 if (family == AF_UNSPEC ||
969 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
970 return nft_flush(&ctx, family);
972 if (nla[NFTA_TABLE_HANDLE]) {
973 attr = nla[NFTA_TABLE_HANDLE];
974 table = nft_table_lookup_byhandle(net, attr, genmask);
976 attr = nla[NFTA_TABLE_NAME];
977 table = nft_table_lookup(net, attr, family, genmask);
981 NL_SET_BAD_ATTR(extack, attr);
982 return PTR_ERR(table);
985 if (nlh->nlmsg_flags & NLM_F_NONREC &&
992 return nft_flush_table(&ctx);
995 static void nf_tables_table_destroy(struct nft_ctx *ctx)
997 BUG_ON(ctx->table->use > 0);
999 rhltable_destroy(&ctx->table->chains_ht);
1000 kfree(ctx->table->name);
1004 void nft_register_chain_type(const struct nft_chain_type *ctype)
1006 if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO))
1009 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1010 if (WARN_ON(chain_type[ctype->family][ctype->type] != NULL)) {
1011 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1014 chain_type[ctype->family][ctype->type] = ctype;
1015 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1017 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1019 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1021 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1022 chain_type[ctype->family][ctype->type] = NULL;
1023 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1025 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1031 static struct nft_chain *
1032 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1034 struct nft_chain *chain;
1036 list_for_each_entry(chain, &table->chains, list) {
1037 if (chain->handle == handle &&
1038 nft_active_genmask(chain, genmask))
1042 return ERR_PTR(-ENOENT);
1045 static struct nft_chain *nft_chain_lookup(struct nft_table *table,
1046 const struct nlattr *nla, u8 genmask)
1048 char search[NFT_CHAIN_MAXNAMELEN + 1];
1049 struct rhlist_head *tmp, *list;
1050 struct nft_chain *chain;
1053 return ERR_PTR(-EINVAL);
1055 nla_strlcpy(search, nla, sizeof(search));
1057 WARN_ON(!rcu_read_lock_held() &&
1058 !lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
1060 chain = ERR_PTR(-ENOENT);
1062 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1066 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1067 if (nft_active_genmask(chain, genmask))
1070 chain = ERR_PTR(-ENOENT);
1076 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1077 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1078 .len = NFT_TABLE_MAXNAMELEN - 1 },
1079 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1080 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1081 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1082 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1083 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1084 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
1085 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1088 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1089 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1090 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1091 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1092 .len = IFNAMSIZ - 1 },
1095 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1097 struct nft_stats *cpu_stats, total;
1098 struct nlattr *nest;
1103 memset(&total, 0, sizeof(total));
1104 for_each_possible_cpu(cpu) {
1105 cpu_stats = per_cpu_ptr(stats, cpu);
1107 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1108 pkts = cpu_stats->pkts;
1109 bytes = cpu_stats->bytes;
1110 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1112 total.bytes += bytes;
1114 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
1116 goto nla_put_failure;
1118 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1119 NFTA_COUNTER_PAD) ||
1120 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1122 goto nla_put_failure;
1124 nla_nest_end(skb, nest);
1131 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1132 u32 portid, u32 seq, int event, u32 flags,
1133 int family, const struct nft_table *table,
1134 const struct nft_chain *chain)
1136 struct nlmsghdr *nlh;
1137 struct nfgenmsg *nfmsg;
1139 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1140 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1142 goto nla_put_failure;
1144 nfmsg = nlmsg_data(nlh);
1145 nfmsg->nfgen_family = family;
1146 nfmsg->version = NFNETLINK_V0;
1147 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1149 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1150 goto nla_put_failure;
1151 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1153 goto nla_put_failure;
1154 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1155 goto nla_put_failure;
1157 if (nft_is_base_chain(chain)) {
1158 const struct nft_base_chain *basechain = nft_base_chain(chain);
1159 const struct nf_hook_ops *ops = &basechain->ops;
1160 struct nlattr *nest;
1162 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
1164 goto nla_put_failure;
1165 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1166 goto nla_put_failure;
1167 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1168 goto nla_put_failure;
1169 if (basechain->dev_name[0] &&
1170 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1171 goto nla_put_failure;
1172 nla_nest_end(skb, nest);
1174 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1175 htonl(basechain->policy)))
1176 goto nla_put_failure;
1178 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1179 goto nla_put_failure;
1181 if (basechain->stats && nft_dump_stats(skb, basechain->stats))
1182 goto nla_put_failure;
1185 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1186 goto nla_put_failure;
1188 nlmsg_end(skb, nlh);
1192 nlmsg_trim(skb, nlh);
1196 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1198 struct sk_buff *skb;
1202 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1205 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1209 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1210 event, 0, ctx->family, ctx->table,
1217 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1218 ctx->report, GFP_KERNEL);
1221 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1224 static int nf_tables_dump_chains(struct sk_buff *skb,
1225 struct netlink_callback *cb)
1227 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1228 const struct nft_table *table;
1229 const struct nft_chain *chain;
1230 unsigned int idx = 0, s_idx = cb->args[0];
1231 struct net *net = sock_net(skb->sk);
1232 int family = nfmsg->nfgen_family;
1235 cb->seq = net->nft.base_seq;
1237 list_for_each_entry_rcu(table, &net->nft.tables, list) {
1238 if (family != NFPROTO_UNSPEC && family != table->family)
1241 list_for_each_entry_rcu(chain, &table->chains, list) {
1245 memset(&cb->args[1], 0,
1246 sizeof(cb->args) - sizeof(cb->args[0]));
1247 if (!nft_is_active(net, chain))
1249 if (nf_tables_fill_chain_info(skb, net,
1250 NETLINK_CB(cb->skb).portid,
1254 table->family, table,
1258 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1269 /* called with rcu_read_lock held */
1270 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1271 struct sk_buff *skb, const struct nlmsghdr *nlh,
1272 const struct nlattr * const nla[],
1273 struct netlink_ext_ack *extack)
1275 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1276 u8 genmask = nft_genmask_cur(net);
1277 const struct nft_chain *chain;
1278 struct nft_table *table;
1279 struct sk_buff *skb2;
1280 int family = nfmsg->nfgen_family;
1283 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1284 struct netlink_dump_control c = {
1285 .dump = nf_tables_dump_chains,
1286 .module = THIS_MODULE,
1289 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1292 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1293 if (IS_ERR(table)) {
1294 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1295 return PTR_ERR(table);
1298 chain = nft_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1299 if (IS_ERR(chain)) {
1300 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1301 return PTR_ERR(chain);
1304 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1308 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1309 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1310 family, table, chain);
1314 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1321 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1322 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1323 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1326 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1328 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1329 struct nft_stats __percpu *newstats;
1330 struct nft_stats *stats;
1333 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy,
1336 return ERR_PTR(err);
1338 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1339 return ERR_PTR(-EINVAL);
1341 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1342 if (newstats == NULL)
1343 return ERR_PTR(-ENOMEM);
1345 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1346 * are not exposed to userspace.
1349 stats = this_cpu_ptr(newstats);
1350 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1351 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1357 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1358 struct nft_stats __percpu *newstats)
1360 struct nft_stats __percpu *oldstats;
1362 if (newstats == NULL)
1366 oldstats = nfnl_dereference(chain->stats, NFNL_SUBSYS_NFTABLES);
1367 rcu_assign_pointer(chain->stats, newstats);
1369 free_percpu(oldstats);
1371 rcu_assign_pointer(chain->stats, newstats);
1372 static_branch_inc(&nft_counters_enabled);
1376 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1378 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1379 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1385 /* should be NULL either via abort or via successful commit */
1386 WARN_ON_ONCE(chain->rules_next);
1387 kvfree(chain->rules_next);
1390 static void nf_tables_chain_destroy(struct nft_ctx *ctx)
1392 struct nft_chain *chain = ctx->chain;
1394 BUG_ON(chain->use > 0);
1396 /* no concurrent access possible anymore */
1397 nf_tables_chain_free_chain_rules(chain);
1399 if (nft_is_base_chain(chain)) {
1400 struct nft_base_chain *basechain = nft_base_chain(chain);
1402 module_put(basechain->type->owner);
1403 free_percpu(basechain->stats);
1404 if (basechain->stats)
1405 static_branch_dec(&nft_counters_enabled);
1414 struct nft_chain_hook {
1417 const struct nft_chain_type *type;
1418 struct net_device *dev;
1421 static int nft_chain_parse_hook(struct net *net,
1422 const struct nlattr * const nla[],
1423 struct nft_chain_hook *hook, u8 family,
1426 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1427 const struct nft_chain_type *type;
1428 struct net_device *dev;
1431 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1432 nft_hook_policy, NULL);
1436 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1437 ha[NFTA_HOOK_PRIORITY] == NULL)
1440 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1441 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1443 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1444 if (nla[NFTA_CHAIN_TYPE]) {
1445 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1448 return PTR_ERR(type);
1450 if (!(type->hook_mask & (1 << hook->num)))
1453 if (type->type == NFT_CHAIN_T_NAT &&
1454 hook->priority <= NF_IP_PRI_CONNTRACK)
1457 if (!try_module_get(type->owner))
1463 if (family == NFPROTO_NETDEV) {
1464 char ifname[IFNAMSIZ];
1466 if (!ha[NFTA_HOOK_DEV]) {
1467 module_put(type->owner);
1471 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1472 dev = __dev_get_by_name(net, ifname);
1474 module_put(type->owner);
1478 } else if (ha[NFTA_HOOK_DEV]) {
1479 module_put(type->owner);
1486 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1488 module_put(hook->type->owner);
1491 struct nft_rules_old {
1493 struct nft_rule **start;
1496 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1499 if (alloc > INT_MAX)
1502 alloc += 1; /* NULL, ends rules */
1503 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1506 alloc *= sizeof(struct nft_rule *);
1507 alloc += sizeof(struct nft_rules_old);
1509 return kvmalloc(alloc, GFP_KERNEL);
1512 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1513 u8 policy, bool create)
1515 const struct nlattr * const *nla = ctx->nla;
1516 struct nft_table *table = ctx->table;
1517 struct nft_base_chain *basechain;
1518 struct nft_stats __percpu *stats;
1519 struct net *net = ctx->net;
1520 struct nft_chain *chain;
1521 struct nft_rule **rules;
1524 if (table->use == UINT_MAX)
1527 if (nla[NFTA_CHAIN_HOOK]) {
1528 struct nft_chain_hook hook;
1529 struct nf_hook_ops *ops;
1531 err = nft_chain_parse_hook(net, nla, &hook, family, create);
1535 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1536 if (basechain == NULL) {
1537 nft_chain_release_hook(&hook);
1541 if (hook.dev != NULL)
1542 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1544 if (nla[NFTA_CHAIN_COUNTERS]) {
1545 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1546 if (IS_ERR(stats)) {
1547 nft_chain_release_hook(&hook);
1549 return PTR_ERR(stats);
1551 basechain->stats = stats;
1552 static_branch_inc(&nft_counters_enabled);
1555 basechain->type = hook.type;
1556 chain = &basechain->chain;
1558 ops = &basechain->ops;
1560 ops->hooknum = hook.num;
1561 ops->priority = hook.priority;
1563 ops->hook = hook.type->hooks[ops->hooknum];
1564 ops->dev = hook.dev;
1566 chain->flags |= NFT_BASE_CHAIN;
1567 basechain->policy = policy;
1569 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1575 INIT_LIST_HEAD(&chain->rules);
1576 chain->handle = nf_tables_alloc_handle(table);
1577 chain->table = table;
1578 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1584 rules = nf_tables_chain_alloc_rules(chain, 0);
1591 rcu_assign_pointer(chain->rules_gen_0, rules);
1592 rcu_assign_pointer(chain->rules_gen_1, rules);
1594 err = nf_tables_register_hook(net, table, chain);
1598 err = rhltable_insert_key(&table->chains_ht, chain->name,
1599 &chain->rhlhead, nft_chain_ht_params);
1603 err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1605 rhltable_remove(&table->chains_ht, &chain->rhlhead,
1606 nft_chain_ht_params);
1611 list_add_tail_rcu(&chain->list, &table->chains);
1615 nf_tables_unregister_hook(net, table, chain);
1617 nf_tables_chain_destroy(ctx);
1622 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
1625 const struct nlattr * const *nla = ctx->nla;
1626 struct nft_table *table = ctx->table;
1627 struct nft_chain *chain = ctx->chain;
1628 struct nft_base_chain *basechain;
1629 struct nft_stats *stats = NULL;
1630 struct nft_chain_hook hook;
1631 const struct nlattr *name;
1632 struct nf_hook_ops *ops;
1633 struct nft_trans *trans;
1636 if (nla[NFTA_CHAIN_HOOK]) {
1637 if (!nft_is_base_chain(chain))
1640 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
1645 basechain = nft_base_chain(chain);
1646 if (basechain->type != hook.type) {
1647 nft_chain_release_hook(&hook);
1651 ops = &basechain->ops;
1652 if (ops->hooknum != hook.num ||
1653 ops->priority != hook.priority ||
1654 ops->dev != hook.dev) {
1655 nft_chain_release_hook(&hook);
1658 nft_chain_release_hook(&hook);
1661 if (nla[NFTA_CHAIN_HANDLE] &&
1662 nla[NFTA_CHAIN_NAME]) {
1663 struct nft_chain *chain2;
1665 chain2 = nft_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1666 if (!IS_ERR(chain2))
1670 if (nla[NFTA_CHAIN_COUNTERS]) {
1671 if (!nft_is_base_chain(chain))
1674 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1676 return PTR_ERR(stats);
1679 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
1680 sizeof(struct nft_trans_chain));
1681 if (trans == NULL) {
1686 nft_trans_chain_stats(trans) = stats;
1687 nft_trans_chain_update(trans) = true;
1689 if (nla[NFTA_CHAIN_POLICY])
1690 nft_trans_chain_policy(trans) = policy;
1692 nft_trans_chain_policy(trans) = -1;
1694 name = nla[NFTA_CHAIN_NAME];
1695 if (nla[NFTA_CHAIN_HANDLE] && name) {
1696 nft_trans_chain_name(trans) =
1697 nla_strdup(name, GFP_KERNEL);
1698 if (!nft_trans_chain_name(trans)) {
1704 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1709 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1710 struct sk_buff *skb, const struct nlmsghdr *nlh,
1711 const struct nlattr * const nla[],
1712 struct netlink_ext_ack *extack)
1714 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1715 u8 genmask = nft_genmask_next(net);
1716 int family = nfmsg->nfgen_family;
1717 const struct nlattr *attr;
1718 struct nft_table *table;
1719 struct nft_chain *chain;
1720 u8 policy = NF_ACCEPT;
1725 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1727 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1728 if (IS_ERR(table)) {
1729 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1730 return PTR_ERR(table);
1734 attr = nla[NFTA_CHAIN_NAME];
1736 if (nla[NFTA_CHAIN_HANDLE]) {
1737 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1738 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1739 if (IS_ERR(chain)) {
1740 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
1741 return PTR_ERR(chain);
1743 attr = nla[NFTA_CHAIN_HANDLE];
1745 chain = nft_chain_lookup(table, attr, genmask);
1746 if (IS_ERR(chain)) {
1747 if (PTR_ERR(chain) != -ENOENT) {
1748 NL_SET_BAD_ATTR(extack, attr);
1749 return PTR_ERR(chain);
1755 if (nla[NFTA_CHAIN_POLICY]) {
1756 if (chain != NULL &&
1757 !nft_is_base_chain(chain)) {
1758 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1762 if (chain == NULL &&
1763 nla[NFTA_CHAIN_HOOK] == NULL) {
1764 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1768 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1778 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1780 if (chain != NULL) {
1781 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1782 NL_SET_BAD_ATTR(extack, attr);
1785 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1788 return nf_tables_updchain(&ctx, genmask, policy, create);
1791 return nf_tables_addchain(&ctx, family, genmask, policy, create);
1794 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1795 struct sk_buff *skb, const struct nlmsghdr *nlh,
1796 const struct nlattr * const nla[],
1797 struct netlink_ext_ack *extack)
1799 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1800 u8 genmask = nft_genmask_next(net);
1801 int family = nfmsg->nfgen_family;
1802 const struct nlattr *attr;
1803 struct nft_table *table;
1804 struct nft_chain *chain;
1805 struct nft_rule *rule;
1811 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1812 if (IS_ERR(table)) {
1813 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1814 return PTR_ERR(table);
1817 if (nla[NFTA_CHAIN_HANDLE]) {
1818 attr = nla[NFTA_CHAIN_HANDLE];
1819 handle = be64_to_cpu(nla_get_be64(attr));
1820 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1822 attr = nla[NFTA_CHAIN_NAME];
1823 chain = nft_chain_lookup(table, attr, genmask);
1825 if (IS_ERR(chain)) {
1826 NL_SET_BAD_ATTR(extack, attr);
1827 return PTR_ERR(chain);
1830 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1834 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1837 list_for_each_entry(rule, &chain->rules, list) {
1838 if (!nft_is_active_next(net, rule))
1842 err = nft_delrule(&ctx, rule);
1847 /* There are rules and elements that are still holding references to us,
1848 * we cannot do a recursive removal in this case.
1851 NL_SET_BAD_ATTR(extack, attr);
1855 return nft_delchain(&ctx);
1863 * nft_register_expr - register nf_tables expr type
1866 * Registers the expr type for use with nf_tables. Returns zero on
1867 * success or a negative errno code otherwise.
1869 int nft_register_expr(struct nft_expr_type *type)
1871 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1872 if (type->family == NFPROTO_UNSPEC)
1873 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1875 list_add_rcu(&type->list, &nf_tables_expressions);
1876 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1879 EXPORT_SYMBOL_GPL(nft_register_expr);
1882 * nft_unregister_expr - unregister nf_tables expr type
1885 * Unregisters the expr typefor use with nf_tables.
1887 void nft_unregister_expr(struct nft_expr_type *type)
1889 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1890 list_del_rcu(&type->list);
1891 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1893 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1895 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1898 const struct nft_expr_type *type;
1900 list_for_each_entry(type, &nf_tables_expressions, list) {
1901 if (!nla_strcmp(nla, type->name) &&
1902 (!type->family || type->family == family))
1908 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
1912 const struct nft_expr_type *type;
1915 return ERR_PTR(-EINVAL);
1917 type = __nft_expr_type_get(family, nla);
1918 if (type != NULL && try_module_get(type->owner))
1921 #ifdef CONFIG_MODULES
1923 nft_request_module(net, "nft-expr-%u-%.*s", family,
1924 nla_len(nla), (char *)nla_data(nla));
1925 if (__nft_expr_type_get(family, nla))
1926 return ERR_PTR(-EAGAIN);
1928 nft_request_module(net, "nft-expr-%.*s",
1929 nla_len(nla), (char *)nla_data(nla));
1930 if (__nft_expr_type_get(family, nla))
1931 return ERR_PTR(-EAGAIN);
1934 return ERR_PTR(-ENOENT);
1937 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1938 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1939 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1942 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1943 const struct nft_expr *expr)
1945 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1946 goto nla_put_failure;
1948 if (expr->ops->dump) {
1949 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1951 goto nla_put_failure;
1952 if (expr->ops->dump(skb, expr) < 0)
1953 goto nla_put_failure;
1954 nla_nest_end(skb, data);
1963 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1964 const struct nft_expr *expr)
1966 struct nlattr *nest;
1968 nest = nla_nest_start(skb, attr);
1970 goto nla_put_failure;
1971 if (nf_tables_fill_expr_info(skb, expr) < 0)
1972 goto nla_put_failure;
1973 nla_nest_end(skb, nest);
1980 struct nft_expr_info {
1981 const struct nft_expr_ops *ops;
1982 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1985 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1986 const struct nlattr *nla,
1987 struct nft_expr_info *info)
1989 const struct nft_expr_type *type;
1990 const struct nft_expr_ops *ops;
1991 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1994 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL);
1998 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2000 return PTR_ERR(type);
2002 if (tb[NFTA_EXPR_DATA]) {
2003 err = nla_parse_nested(info->tb, type->maxattr,
2004 tb[NFTA_EXPR_DATA], type->policy, NULL);
2008 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2010 if (type->select_ops != NULL) {
2011 ops = type->select_ops(ctx,
2012 (const struct nlattr * const *)info->tb);
2024 module_put(type->owner);
2028 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2029 const struct nft_expr_info *info,
2030 struct nft_expr *expr)
2032 const struct nft_expr_ops *ops = info->ops;
2037 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2048 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2049 struct nft_expr *expr)
2051 if (expr->ops->destroy)
2052 expr->ops->destroy(ctx, expr);
2053 module_put(expr->ops->type->owner);
2056 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2057 const struct nlattr *nla)
2059 struct nft_expr_info info;
2060 struct nft_expr *expr;
2063 err = nf_tables_expr_parse(ctx, nla, &info);
2068 expr = kzalloc(info.ops->size, GFP_KERNEL);
2072 err = nf_tables_newexpr(ctx, &info, expr);
2080 module_put(info.ops->type->owner);
2082 return ERR_PTR(err);
2085 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2087 nf_tables_expr_destroy(ctx, expr);
2095 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2098 struct nft_rule *rule;
2100 // FIXME: this sucks
2101 list_for_each_entry_rcu(rule, &chain->rules, list) {
2102 if (handle == rule->handle)
2106 return ERR_PTR(-ENOENT);
2109 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2110 const struct nlattr *nla)
2113 return ERR_PTR(-EINVAL);
2115 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2118 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2119 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2120 .len = NFT_TABLE_MAXNAMELEN - 1 },
2121 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2122 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2123 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2124 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2125 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2126 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2127 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2128 .len = NFT_USERDATA_MAXLEN },
2129 [NFTA_RULE_ID] = { .type = NLA_U32 },
2132 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2133 u32 portid, u32 seq, int event,
2134 u32 flags, int family,
2135 const struct nft_table *table,
2136 const struct nft_chain *chain,
2137 const struct nft_rule *rule)
2139 struct nlmsghdr *nlh;
2140 struct nfgenmsg *nfmsg;
2141 const struct nft_expr *expr, *next;
2142 struct nlattr *list;
2143 const struct nft_rule *prule;
2144 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2146 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2148 goto nla_put_failure;
2150 nfmsg = nlmsg_data(nlh);
2151 nfmsg->nfgen_family = family;
2152 nfmsg->version = NFNETLINK_V0;
2153 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
2155 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2156 goto nla_put_failure;
2157 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2158 goto nla_put_failure;
2159 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2161 goto nla_put_failure;
2163 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
2164 prule = list_prev_entry(rule, list);
2165 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2166 cpu_to_be64(prule->handle),
2168 goto nla_put_failure;
2171 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
2173 goto nla_put_failure;
2174 nft_rule_for_each_expr(expr, next, rule) {
2175 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2176 goto nla_put_failure;
2178 nla_nest_end(skb, list);
2181 struct nft_userdata *udata = nft_userdata(rule);
2182 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2184 goto nla_put_failure;
2187 nlmsg_end(skb, nlh);
2191 nlmsg_trim(skb, nlh);
2195 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2196 const struct nft_rule *rule, int event)
2198 struct sk_buff *skb;
2202 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2205 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2209 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2210 event, 0, ctx->family, ctx->table,
2217 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2218 ctx->report, GFP_KERNEL);
2221 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2224 struct nft_rule_dump_ctx {
2229 static int nf_tables_dump_rules(struct sk_buff *skb,
2230 struct netlink_callback *cb)
2232 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2233 const struct nft_rule_dump_ctx *ctx = cb->data;
2234 const struct nft_table *table;
2235 const struct nft_chain *chain;
2236 const struct nft_rule *rule;
2237 unsigned int idx = 0, s_idx = cb->args[0];
2238 struct net *net = sock_net(skb->sk);
2239 int family = nfmsg->nfgen_family;
2242 cb->seq = net->nft.base_seq;
2244 list_for_each_entry_rcu(table, &net->nft.tables, list) {
2245 if (family != NFPROTO_UNSPEC && family != table->family)
2248 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2251 list_for_each_entry_rcu(chain, &table->chains, list) {
2252 if (ctx && ctx->chain &&
2253 strcmp(ctx->chain, chain->name) != 0)
2256 list_for_each_entry_rcu(rule, &chain->rules, list) {
2257 if (!nft_is_active(net, rule))
2262 memset(&cb->args[1], 0,
2263 sizeof(cb->args) - sizeof(cb->args[0]));
2264 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2267 NLM_F_MULTI | NLM_F_APPEND,
2269 table, chain, rule) < 0)
2272 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2285 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2287 struct nft_rule_dump_ctx *ctx = cb->data;
2297 /* called with rcu_read_lock held */
2298 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2299 struct sk_buff *skb, const struct nlmsghdr *nlh,
2300 const struct nlattr * const nla[],
2301 struct netlink_ext_ack *extack)
2303 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2304 u8 genmask = nft_genmask_cur(net);
2305 const struct nft_chain *chain;
2306 const struct nft_rule *rule;
2307 struct nft_table *table;
2308 struct sk_buff *skb2;
2309 int family = nfmsg->nfgen_family;
2312 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2313 struct netlink_dump_control c = {
2314 .dump = nf_tables_dump_rules,
2315 .done = nf_tables_dump_rules_done,
2316 .module = THIS_MODULE,
2319 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2320 struct nft_rule_dump_ctx *ctx;
2322 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2326 if (nla[NFTA_RULE_TABLE]) {
2327 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2334 if (nla[NFTA_RULE_CHAIN]) {
2335 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2346 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
2349 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2350 if (IS_ERR(table)) {
2351 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2352 return PTR_ERR(table);
2355 chain = nft_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2356 if (IS_ERR(chain)) {
2357 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2358 return PTR_ERR(chain);
2361 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2363 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2364 return PTR_ERR(rule);
2367 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
2371 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2372 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2373 family, table, chain, rule);
2377 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2384 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2385 struct nft_rule *rule)
2387 struct nft_expr *expr;
2390 * Careful: some expressions might not be initialized in case this
2391 * is called on error from nf_tables_newrule().
2393 expr = nft_expr_first(rule);
2394 while (expr != nft_expr_last(rule) && expr->ops) {
2395 nf_tables_expr_destroy(ctx, expr);
2396 expr = nft_expr_next(expr);
2401 static void nf_tables_rule_release(const struct nft_ctx *ctx,
2402 struct nft_rule *rule)
2404 nft_rule_expr_deactivate(ctx, rule);
2405 nf_tables_rule_destroy(ctx, rule);
2408 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
2410 struct nft_expr *expr, *last;
2411 const struct nft_data *data;
2412 struct nft_rule *rule;
2415 list_for_each_entry(rule, &chain->rules, list) {
2416 if (!nft_is_active_next(ctx->net, rule))
2419 nft_rule_for_each_expr(expr, last, rule) {
2420 if (!expr->ops->validate)
2423 err = expr->ops->validate(ctx, expr, &data);
2431 EXPORT_SYMBOL_GPL(nft_chain_validate);
2433 static int nft_table_validate(struct net *net, const struct nft_table *table)
2435 struct nft_chain *chain;
2436 struct nft_ctx ctx = {
2438 .family = table->family,
2442 list_for_each_entry(chain, &table->chains, list) {
2443 if (!nft_is_base_chain(chain))
2447 err = nft_chain_validate(&ctx, chain);
2455 #define NFT_RULE_MAXEXPRS 128
2457 static struct nft_expr_info *info;
2459 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2460 struct sk_buff *skb, const struct nlmsghdr *nlh,
2461 const struct nlattr * const nla[],
2462 struct netlink_ext_ack *extack)
2464 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2465 u8 genmask = nft_genmask_next(net);
2466 int family = nfmsg->nfgen_family;
2467 struct nft_table *table;
2468 struct nft_chain *chain;
2469 struct nft_rule *rule, *old_rule = NULL;
2470 struct nft_userdata *udata;
2471 struct nft_trans *trans = NULL;
2472 struct nft_expr *expr;
2475 unsigned int size, i, n, ulen = 0, usize = 0;
2478 u64 handle, pos_handle;
2480 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2482 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2483 if (IS_ERR(table)) {
2484 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2485 return PTR_ERR(table);
2488 chain = nft_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2489 if (IS_ERR(chain)) {
2490 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2491 return PTR_ERR(chain);
2494 if (nla[NFTA_RULE_HANDLE]) {
2495 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2496 rule = __nft_rule_lookup(chain, handle);
2498 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2499 return PTR_ERR(rule);
2502 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2503 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2506 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2511 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2513 handle = nf_tables_alloc_handle(table);
2515 if (chain->use == UINT_MAX)
2519 if (nla[NFTA_RULE_POSITION]) {
2520 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2523 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2524 old_rule = __nft_rule_lookup(chain, pos_handle);
2525 if (IS_ERR(old_rule)) {
2526 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
2527 return PTR_ERR(old_rule);
2531 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2535 if (nla[NFTA_RULE_EXPRESSIONS]) {
2536 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2538 if (nla_type(tmp) != NFTA_LIST_ELEM)
2540 if (n == NFT_RULE_MAXEXPRS)
2542 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2545 size += info[n].ops->size;
2549 /* Check for overflow of dlen field */
2551 if (size >= 1 << 12)
2554 if (nla[NFTA_RULE_USERDATA]) {
2555 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2557 usize = sizeof(struct nft_userdata) + ulen;
2561 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2565 nft_activate_next(net, rule);
2567 rule->handle = handle;
2569 rule->udata = ulen ? 1 : 0;
2572 udata = nft_userdata(rule);
2573 udata->len = ulen - 1;
2574 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2577 expr = nft_expr_first(rule);
2578 for (i = 0; i < n; i++) {
2579 err = nf_tables_newexpr(&ctx, &info[i], expr);
2583 if (info[i].ops->validate)
2584 nft_validate_state_update(net, NFT_VALIDATE_NEED);
2587 expr = nft_expr_next(expr);
2590 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2591 if (!nft_is_active_next(net, old_rule)) {
2595 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2597 if (trans == NULL) {
2601 nft_deactivate_next(net, old_rule);
2604 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2609 list_add_tail_rcu(&rule->list, &old_rule->list);
2611 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2616 if (nlh->nlmsg_flags & NLM_F_APPEND) {
2618 list_add_rcu(&rule->list, &old_rule->list);
2620 list_add_tail_rcu(&rule->list, &chain->rules);
2623 list_add_tail_rcu(&rule->list, &old_rule->list);
2625 list_add_rcu(&rule->list, &chain->rules);
2630 if (net->nft.validate_state == NFT_VALIDATE_DO)
2631 return nft_table_validate(net, table);
2635 nf_tables_rule_release(&ctx, rule);
2637 for (i = 0; i < n; i++) {
2638 if (info[i].ops != NULL)
2639 module_put(info[i].ops->type->owner);
2644 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2645 const struct nlattr *nla)
2647 u32 id = ntohl(nla_get_be32(nla));
2648 struct nft_trans *trans;
2650 list_for_each_entry(trans, &net->nft.commit_list, list) {
2651 struct nft_rule *rule = nft_trans_rule(trans);
2653 if (trans->msg_type == NFT_MSG_NEWRULE &&
2654 id == nft_trans_rule_id(trans))
2657 return ERR_PTR(-ENOENT);
2660 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2661 struct sk_buff *skb, const struct nlmsghdr *nlh,
2662 const struct nlattr * const nla[],
2663 struct netlink_ext_ack *extack)
2665 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2666 u8 genmask = nft_genmask_next(net);
2667 struct nft_table *table;
2668 struct nft_chain *chain = NULL;
2669 struct nft_rule *rule;
2670 int family = nfmsg->nfgen_family, err = 0;
2673 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2674 if (IS_ERR(table)) {
2675 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2676 return PTR_ERR(table);
2679 if (nla[NFTA_RULE_CHAIN]) {
2680 chain = nft_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2681 if (IS_ERR(chain)) {
2682 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2683 return PTR_ERR(chain);
2687 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2690 if (nla[NFTA_RULE_HANDLE]) {
2691 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2693 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2694 return PTR_ERR(rule);
2697 err = nft_delrule(&ctx, rule);
2698 } else if (nla[NFTA_RULE_ID]) {
2699 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2701 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
2702 return PTR_ERR(rule);
2705 err = nft_delrule(&ctx, rule);
2707 err = nft_delrule_by_chain(&ctx);
2710 list_for_each_entry(chain, &table->chains, list) {
2711 if (!nft_is_active_next(net, chain))
2715 err = nft_delrule_by_chain(&ctx);
2728 static LIST_HEAD(nf_tables_set_types);
2730 int nft_register_set(struct nft_set_type *type)
2732 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2733 list_add_tail_rcu(&type->list, &nf_tables_set_types);
2734 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2737 EXPORT_SYMBOL_GPL(nft_register_set);
2739 void nft_unregister_set(struct nft_set_type *type)
2741 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2742 list_del_rcu(&type->list);
2743 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2745 EXPORT_SYMBOL_GPL(nft_unregister_set);
2747 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
2748 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
2751 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
2753 return (flags & type->features) == (flags & NFT_SET_FEATURES);
2757 * Select a set implementation based on the data characteristics and the
2758 * given policy. The total memory use might not be known if no size is
2759 * given, in that case the amount of memory per element is used.
2761 static const struct nft_set_ops *
2762 nft_select_set_ops(const struct nft_ctx *ctx,
2763 const struct nlattr * const nla[],
2764 const struct nft_set_desc *desc,
2765 enum nft_set_policies policy)
2767 const struct nft_set_ops *ops, *bops;
2768 struct nft_set_estimate est, best;
2769 const struct nft_set_type *type;
2772 #ifdef CONFIG_MODULES
2773 if (list_empty(&nf_tables_set_types)) {
2774 nft_request_module(ctx->net, "nft-set");
2775 if (!list_empty(&nf_tables_set_types))
2776 return ERR_PTR(-EAGAIN);
2779 if (nla[NFTA_SET_FLAGS] != NULL)
2780 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2787 list_for_each_entry(type, &nf_tables_set_types, list) {
2790 if (!nft_set_ops_candidate(type, flags))
2792 if (!ops->estimate(desc, flags, &est))
2796 case NFT_SET_POL_PERFORMANCE:
2797 if (est.lookup < best.lookup)
2799 if (est.lookup == best.lookup &&
2800 est.space < best.space)
2803 case NFT_SET_POL_MEMORY:
2805 if (est.space < best.space)
2807 if (est.space == best.space &&
2808 est.lookup < best.lookup)
2810 } else if (est.size < best.size || !bops) {
2818 if (!try_module_get(type->owner))
2821 module_put(to_set_type(bops)->owner);
2830 return ERR_PTR(-EOPNOTSUPP);
2833 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2834 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2835 .len = NFT_TABLE_MAXNAMELEN - 1 },
2836 [NFTA_SET_NAME] = { .type = NLA_STRING,
2837 .len = NFT_SET_MAXNAMELEN - 1 },
2838 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2839 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2840 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2841 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2842 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2843 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2844 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2845 [NFTA_SET_ID] = { .type = NLA_U32 },
2846 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2847 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2848 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2849 .len = NFT_USERDATA_MAXLEN },
2850 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
2851 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
2854 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2855 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2858 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2859 const struct sk_buff *skb,
2860 const struct nlmsghdr *nlh,
2861 const struct nlattr * const nla[],
2862 struct netlink_ext_ack *extack,
2865 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2866 int family = nfmsg->nfgen_family;
2867 struct nft_table *table = NULL;
2869 if (nla[NFTA_SET_TABLE] != NULL) {
2870 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
2872 if (IS_ERR(table)) {
2873 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
2874 return PTR_ERR(table);
2878 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
2882 static struct nft_set *nft_set_lookup(const struct nft_table *table,
2883 const struct nlattr *nla, u8 genmask)
2885 struct nft_set *set;
2888 return ERR_PTR(-EINVAL);
2890 list_for_each_entry_rcu(set, &table->sets, list) {
2891 if (!nla_strcmp(nla, set->name) &&
2892 nft_active_genmask(set, genmask))
2895 return ERR_PTR(-ENOENT);
2898 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
2899 const struct nlattr *nla,
2902 struct nft_set *set;
2904 list_for_each_entry(set, &table->sets, list) {
2905 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
2906 nft_active_genmask(set, genmask))
2909 return ERR_PTR(-ENOENT);
2912 static struct nft_set *nft_set_lookup_byid(const struct net *net,
2913 const struct nlattr *nla, u8 genmask)
2915 struct nft_trans *trans;
2916 u32 id = ntohl(nla_get_be32(nla));
2918 list_for_each_entry(trans, &net->nft.commit_list, list) {
2919 if (trans->msg_type == NFT_MSG_NEWSET) {
2920 struct nft_set *set = nft_trans_set(trans);
2922 if (id == nft_trans_set_id(trans) &&
2923 nft_active_genmask(set, genmask))
2927 return ERR_PTR(-ENOENT);
2930 struct nft_set *nft_set_lookup_global(const struct net *net,
2931 const struct nft_table *table,
2932 const struct nlattr *nla_set_name,
2933 const struct nlattr *nla_set_id,
2936 struct nft_set *set;
2938 set = nft_set_lookup(table, nla_set_name, genmask);
2943 set = nft_set_lookup_byid(net, nla_set_id, genmask);
2947 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
2949 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2952 const struct nft_set *i;
2954 unsigned long *inuse;
2955 unsigned int n = 0, min = 0;
2957 p = strchr(name, '%');
2959 if (p[1] != 'd' || strchr(p + 2, '%'))
2962 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2966 list_for_each_entry(i, &ctx->table->sets, list) {
2969 if (!nft_is_active_next(ctx->net, set))
2971 if (!sscanf(i->name, name, &tmp))
2973 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2976 set_bit(tmp - min, inuse);
2979 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2980 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2981 min += BITS_PER_BYTE * PAGE_SIZE;
2982 memset(inuse, 0, PAGE_SIZE);
2985 free_page((unsigned long)inuse);
2988 set->name = kasprintf(GFP_KERNEL, name, min + n);
2992 list_for_each_entry(i, &ctx->table->sets, list) {
2993 if (!nft_is_active_next(ctx->net, i))
2995 if (!strcmp(set->name, i->name)) {
3003 static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3005 u64 ms = be64_to_cpu(nla_get_be64(nla));
3006 u64 max = (u64)(~((u64)0));
3008 max = div_u64(max, NSEC_PER_MSEC);
3012 ms *= NSEC_PER_MSEC;
3013 *result = nsecs_to_jiffies64(ms);
3017 static __be64 nf_jiffies64_to_msecs(u64 input)
3019 u64 ms = jiffies64_to_nsecs(input);
3021 return cpu_to_be64(div_u64(ms, NSEC_PER_MSEC));
3024 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3025 const struct nft_set *set, u16 event, u16 flags)
3027 struct nfgenmsg *nfmsg;
3028 struct nlmsghdr *nlh;
3029 struct nlattr *desc;
3030 u32 portid = ctx->portid;
3033 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3034 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3037 goto nla_put_failure;
3039 nfmsg = nlmsg_data(nlh);
3040 nfmsg->nfgen_family = ctx->family;
3041 nfmsg->version = NFNETLINK_V0;
3042 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3044 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3045 goto nla_put_failure;
3046 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3047 goto nla_put_failure;
3048 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3050 goto nla_put_failure;
3051 if (set->flags != 0)
3052 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3053 goto nla_put_failure;
3055 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3056 goto nla_put_failure;
3057 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3058 goto nla_put_failure;
3059 if (set->flags & NFT_SET_MAP) {
3060 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3061 goto nla_put_failure;
3062 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3063 goto nla_put_failure;
3065 if (set->flags & NFT_SET_OBJECT &&
3066 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3067 goto nla_put_failure;
3070 nla_put_be64(skb, NFTA_SET_TIMEOUT,
3071 nf_jiffies64_to_msecs(set->timeout),
3073 goto nla_put_failure;
3075 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3076 goto nla_put_failure;
3078 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3079 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3080 goto nla_put_failure;
3083 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3084 goto nla_put_failure;
3086 desc = nla_nest_start(skb, NFTA_SET_DESC);
3088 goto nla_put_failure;
3090 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3091 goto nla_put_failure;
3092 nla_nest_end(skb, desc);
3094 nlmsg_end(skb, nlh);
3098 nlmsg_trim(skb, nlh);
3102 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3103 const struct nft_set *set, int event,
3106 struct sk_buff *skb;
3107 u32 portid = ctx->portid;
3111 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3114 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3118 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3124 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
3128 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3131 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3133 const struct nft_set *set;
3134 unsigned int idx, s_idx = cb->args[0];
3135 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3136 struct net *net = sock_net(skb->sk);
3137 struct nft_ctx *ctx = cb->data, ctx_set;
3143 cb->seq = net->nft.base_seq;
3145 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3146 if (ctx->family != NFPROTO_UNSPEC &&
3147 ctx->family != table->family)
3150 if (ctx->table && ctx->table != table)
3154 if (cur_table != table)
3160 list_for_each_entry_rcu(set, &table->sets, list) {
3163 if (!nft_is_active(net, set))
3167 ctx_set.table = table;
3168 ctx_set.family = table->family;
3170 if (nf_tables_fill_set(skb, &ctx_set, set,
3174 cb->args[2] = (unsigned long) table;
3177 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3190 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3196 /* called with rcu_read_lock held */
3197 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3198 struct sk_buff *skb, const struct nlmsghdr *nlh,
3199 const struct nlattr * const nla[],
3200 struct netlink_ext_ack *extack)
3202 u8 genmask = nft_genmask_cur(net);
3203 const struct nft_set *set;
3205 struct sk_buff *skb2;
3206 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3209 /* Verify existence before starting dump */
3210 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3215 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3216 struct netlink_dump_control c = {
3217 .dump = nf_tables_dump_sets,
3218 .done = nf_tables_dump_sets_done,
3219 .module = THIS_MODULE,
3221 struct nft_ctx *ctx_dump;
3223 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_ATOMIC);
3224 if (ctx_dump == NULL)
3230 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3233 /* Only accept unspec with dump */
3234 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3235 return -EAFNOSUPPORT;
3236 if (!nla[NFTA_SET_TABLE])
3239 set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3241 return PTR_ERR(set);
3243 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3247 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3251 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3258 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
3259 struct nft_set_desc *desc,
3260 const struct nlattr *nla)
3262 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
3265 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
3266 nft_set_desc_policy, NULL);
3270 if (da[NFTA_SET_DESC_SIZE] != NULL)
3271 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
3276 static int nf_tables_newset(struct net *net, struct sock *nlsk,
3277 struct sk_buff *skb, const struct nlmsghdr *nlh,
3278 const struct nlattr * const nla[],
3279 struct netlink_ext_ack *extack)
3281 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3282 u8 genmask = nft_genmask_next(net);
3283 int family = nfmsg->nfgen_family;
3284 const struct nft_set_ops *ops;
3285 struct nft_table *table;
3286 struct nft_set *set;
3292 u32 ktype, dtype, flags, policy, gc_int, objtype;
3293 struct nft_set_desc desc;
3294 unsigned char *udata;
3298 if (nla[NFTA_SET_TABLE] == NULL ||
3299 nla[NFTA_SET_NAME] == NULL ||
3300 nla[NFTA_SET_KEY_LEN] == NULL ||
3301 nla[NFTA_SET_ID] == NULL)
3304 memset(&desc, 0, sizeof(desc));
3306 ktype = NFT_DATA_VALUE;
3307 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3308 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3309 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3313 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
3314 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
3318 if (nla[NFTA_SET_FLAGS] != NULL) {
3319 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3320 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
3321 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
3322 NFT_SET_MAP | NFT_SET_EVAL |
3325 /* Only one of these operations is supported */
3326 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3327 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
3332 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3333 if (!(flags & NFT_SET_MAP))
3336 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3337 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3338 dtype != NFT_DATA_VERDICT)
3341 if (dtype != NFT_DATA_VERDICT) {
3342 if (nla[NFTA_SET_DATA_LEN] == NULL)
3344 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
3345 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
3348 desc.dlen = sizeof(struct nft_verdict);
3349 } else if (flags & NFT_SET_MAP)
3352 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3353 if (!(flags & NFT_SET_OBJECT))
3356 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3357 if (objtype == NFT_OBJECT_UNSPEC ||
3358 objtype > NFT_OBJECT_MAX)
3360 } else if (flags & NFT_SET_OBJECT)
3363 objtype = NFT_OBJECT_UNSPEC;
3366 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3367 if (!(flags & NFT_SET_TIMEOUT))
3370 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
3375 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3376 if (!(flags & NFT_SET_TIMEOUT))
3378 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3381 policy = NFT_SET_POL_PERFORMANCE;
3382 if (nla[NFTA_SET_POLICY] != NULL)
3383 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3385 if (nla[NFTA_SET_DESC] != NULL) {
3386 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
3391 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
3393 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
3394 if (IS_ERR(table)) {
3395 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3396 return PTR_ERR(table);
3399 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
3401 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
3403 if (PTR_ERR(set) != -ENOENT) {
3404 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3405 return PTR_ERR(set);
3408 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3409 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3412 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3418 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3421 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
3423 return PTR_ERR(ops);
3426 if (nla[NFTA_SET_USERDATA])
3427 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3430 if (ops->privsize != NULL)
3431 size = ops->privsize(nla, &desc);
3433 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3439 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3445 err = nf_tables_set_alloc_name(&ctx, set, name);
3452 udata = set->data + size;
3453 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3456 INIT_LIST_HEAD(&set->bindings);
3458 write_pnet(&set->net, net);
3461 set->klen = desc.klen;
3463 set->objtype = objtype;
3464 set->dlen = desc.dlen;
3466 set->size = desc.size;
3467 set->policy = policy;
3470 set->timeout = timeout;
3471 set->gc_int = gc_int;
3472 set->handle = nf_tables_alloc_handle(table);
3474 err = ops->init(set, &desc, nla);
3478 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3482 list_add_tail_rcu(&set->list, &table->sets);
3493 module_put(to_set_type(ops)->owner);
3497 static void nft_set_destroy(struct nft_set *set)
3499 set->ops->destroy(set);
3500 module_put(to_set_type(set->ops)->owner);
3505 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3507 list_del_rcu(&set->list);
3508 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
3509 nft_set_destroy(set);
3512 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3513 struct sk_buff *skb, const struct nlmsghdr *nlh,
3514 const struct nlattr * const nla[],
3515 struct netlink_ext_ack *extack)
3517 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3518 u8 genmask = nft_genmask_next(net);
3519 const struct nlattr *attr;
3520 struct nft_set *set;
3524 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3525 return -EAFNOSUPPORT;
3526 if (nla[NFTA_SET_TABLE] == NULL)
3529 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3534 if (nla[NFTA_SET_HANDLE]) {
3535 attr = nla[NFTA_SET_HANDLE];
3536 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
3538 attr = nla[NFTA_SET_NAME];
3539 set = nft_set_lookup(ctx.table, attr, genmask);
3543 NL_SET_BAD_ATTR(extack, attr);
3544 return PTR_ERR(set);
3546 if (!list_empty(&set->bindings) ||
3547 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
3548 NL_SET_BAD_ATTR(extack, attr);
3552 return nft_delset(&ctx, set);
3555 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3556 struct nft_set *set,
3557 const struct nft_set_iter *iter,
3558 struct nft_set_elem *elem)
3560 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3561 enum nft_registers dreg;
3563 dreg = nft_type_to_reg(set->dtype);
3564 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3565 set->dtype == NFT_DATA_VERDICT ?
3566 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3570 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3571 struct nft_set_binding *binding)
3573 struct nft_set_binding *i;
3574 struct nft_set_iter iter;
3576 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
3579 if (binding->flags & NFT_SET_MAP) {
3580 /* If the set is already bound to the same chain all
3581 * jumps are already validated for that chain.
3583 list_for_each_entry(i, &set->bindings, list) {
3584 if (i->flags & NFT_SET_MAP &&
3585 i->chain == binding->chain)
3589 iter.genmask = nft_genmask_next(ctx->net);
3593 iter.fn = nf_tables_bind_check_setelem;
3595 set->ops->walk(ctx, set, &iter);
3600 binding->chain = ctx->chain;
3601 list_add_tail_rcu(&binding->list, &set->bindings);
3604 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3606 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3607 struct nft_set_binding *binding)
3609 list_del_rcu(&binding->list);
3611 if (list_empty(&set->bindings) && nft_set_is_anonymous(set) &&
3612 nft_is_active(ctx->net, set))
3613 nf_tables_set_destroy(ctx, set);
3615 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3617 const struct nft_set_ext_type nft_set_ext_types[] = {
3618 [NFT_SET_EXT_KEY] = {
3619 .align = __alignof__(u32),
3621 [NFT_SET_EXT_DATA] = {
3622 .align = __alignof__(u32),
3624 [NFT_SET_EXT_EXPR] = {
3625 .align = __alignof__(struct nft_expr),
3627 [NFT_SET_EXT_OBJREF] = {
3628 .len = sizeof(struct nft_object *),
3629 .align = __alignof__(struct nft_object *),
3631 [NFT_SET_EXT_FLAGS] = {
3633 .align = __alignof__(u8),
3635 [NFT_SET_EXT_TIMEOUT] = {
3637 .align = __alignof__(u64),
3639 [NFT_SET_EXT_EXPIRATION] = {
3641 .align = __alignof__(u64),
3643 [NFT_SET_EXT_USERDATA] = {
3644 .len = sizeof(struct nft_userdata),
3645 .align = __alignof__(struct nft_userdata),
3648 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3654 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3655 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3656 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3657 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3658 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3659 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3660 .len = NFT_USERDATA_MAXLEN },
3661 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
3662 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING },
3665 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3666 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3667 .len = NFT_TABLE_MAXNAMELEN - 1 },
3668 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3669 .len = NFT_SET_MAXNAMELEN - 1 },
3670 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3671 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3674 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3675 const struct sk_buff *skb,
3676 const struct nlmsghdr *nlh,
3677 const struct nlattr * const nla[],
3678 struct netlink_ext_ack *extack,
3681 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3682 int family = nfmsg->nfgen_family;
3683 struct nft_table *table;
3685 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
3687 if (IS_ERR(table)) {
3688 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
3689 return PTR_ERR(table);
3692 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3696 static int nf_tables_fill_setelem(struct sk_buff *skb,
3697 const struct nft_set *set,
3698 const struct nft_set_elem *elem)
3700 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3701 unsigned char *b = skb_tail_pointer(skb);
3702 struct nlattr *nest;
3704 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3706 goto nla_put_failure;
3708 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3709 NFT_DATA_VALUE, set->klen) < 0)
3710 goto nla_put_failure;
3712 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3713 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3714 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3716 goto nla_put_failure;
3718 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3719 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3720 goto nla_put_failure;
3722 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3723 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3724 (*nft_set_ext_obj(ext))->name) < 0)
3725 goto nla_put_failure;
3727 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3728 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3729 htonl(*nft_set_ext_flags(ext))))
3730 goto nla_put_failure;
3732 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3733 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3734 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
3736 goto nla_put_failure;
3738 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3739 u64 expires, now = get_jiffies_64();
3741 expires = *nft_set_ext_expiration(ext);
3742 if (time_before64(now, expires))
3747 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3748 nf_jiffies64_to_msecs(expires),
3750 goto nla_put_failure;
3753 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3754 struct nft_userdata *udata;
3756 udata = nft_set_ext_userdata(ext);
3757 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3758 udata->len + 1, udata->data))
3759 goto nla_put_failure;
3762 nla_nest_end(skb, nest);
3770 struct nft_set_dump_args {
3771 const struct netlink_callback *cb;
3772 struct nft_set_iter iter;
3773 struct sk_buff *skb;
3776 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3777 struct nft_set *set,
3778 const struct nft_set_iter *iter,
3779 struct nft_set_elem *elem)
3781 struct nft_set_dump_args *args;
3783 args = container_of(iter, struct nft_set_dump_args, iter);
3784 return nf_tables_fill_setelem(args->skb, set, elem);
3787 struct nft_set_dump_ctx {
3788 const struct nft_set *set;
3792 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3794 struct nft_set_dump_ctx *dump_ctx = cb->data;
3795 struct net *net = sock_net(skb->sk);
3796 struct nft_table *table;
3797 struct nft_set *set;
3798 struct nft_set_dump_args args;
3799 bool set_found = false;
3800 struct nfgenmsg *nfmsg;
3801 struct nlmsghdr *nlh;
3802 struct nlattr *nest;
3807 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3808 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
3809 dump_ctx->ctx.family != table->family)
3812 if (table != dump_ctx->ctx.table)
3815 list_for_each_entry_rcu(set, &table->sets, list) {
3816 if (set == dump_ctx->set) {
3829 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
3830 portid = NETLINK_CB(cb->skb).portid;
3831 seq = cb->nlh->nlmsg_seq;
3833 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3836 goto nla_put_failure;
3838 nfmsg = nlmsg_data(nlh);
3839 nfmsg->nfgen_family = table->family;
3840 nfmsg->version = NFNETLINK_V0;
3841 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3843 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
3844 goto nla_put_failure;
3845 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3846 goto nla_put_failure;
3848 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3850 goto nla_put_failure;
3854 args.iter.genmask = nft_genmask_cur(net);
3855 args.iter.skip = cb->args[0];
3856 args.iter.count = 0;
3858 args.iter.fn = nf_tables_dump_setelem;
3859 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
3862 nla_nest_end(skb, nest);
3863 nlmsg_end(skb, nlh);
3865 if (args.iter.err && args.iter.err != -EMSGSIZE)
3866 return args.iter.err;
3867 if (args.iter.count == cb->args[0])
3870 cb->args[0] = args.iter.count;
3878 static int nf_tables_dump_set_done(struct netlink_callback *cb)
3884 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3885 const struct nft_ctx *ctx, u32 seq,
3886 u32 portid, int event, u16 flags,
3887 const struct nft_set *set,
3888 const struct nft_set_elem *elem)
3890 struct nfgenmsg *nfmsg;
3891 struct nlmsghdr *nlh;
3892 struct nlattr *nest;
3895 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3896 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3899 goto nla_put_failure;
3901 nfmsg = nlmsg_data(nlh);
3902 nfmsg->nfgen_family = ctx->family;
3903 nfmsg->version = NFNETLINK_V0;
3904 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3906 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3907 goto nla_put_failure;
3908 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3909 goto nla_put_failure;
3911 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3913 goto nla_put_failure;
3915 err = nf_tables_fill_setelem(skb, set, elem);
3917 goto nla_put_failure;
3919 nla_nest_end(skb, nest);
3921 nlmsg_end(skb, nlh);
3925 nlmsg_trim(skb, nlh);
3929 static int nft_setelem_parse_flags(const struct nft_set *set,
3930 const struct nlattr *attr, u32 *flags)
3935 *flags = ntohl(nla_get_be32(attr));
3936 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3938 if (!(set->flags & NFT_SET_INTERVAL) &&
3939 *flags & NFT_SET_ELEM_INTERVAL_END)
3945 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3946 const struct nlattr *attr)
3948 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3949 const struct nft_set_ext *ext;
3950 struct nft_data_desc desc;
3951 struct nft_set_elem elem;
3952 struct sk_buff *skb;
3957 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3958 nft_set_elem_policy, NULL);
3962 if (!nla[NFTA_SET_ELEM_KEY])
3965 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3969 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3970 nla[NFTA_SET_ELEM_KEY]);
3975 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3978 priv = set->ops->get(ctx->net, set, &elem, flags);
3980 return PTR_ERR(priv);
3983 ext = nft_set_elem_ext(set, &elem);
3986 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
3990 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
3991 NFT_MSG_NEWSETELEM, 0, set, &elem);
3995 err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT);
3996 /* This avoids a loop in nfnetlink. */
4004 /* this avoids a loop in nfnetlink. */
4005 return err == -EAGAIN ? -ENOBUFS : err;
4008 /* called with rcu_read_lock held */
4009 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4010 struct sk_buff *skb, const struct nlmsghdr *nlh,
4011 const struct nlattr * const nla[],
4012 struct netlink_ext_ack *extack)
4014 u8 genmask = nft_genmask_cur(net);
4015 struct nft_set *set;
4016 struct nlattr *attr;
4020 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4025 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4027 return PTR_ERR(set);
4029 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4030 struct netlink_dump_control c = {
4031 .dump = nf_tables_dump_set,
4032 .done = nf_tables_dump_set_done,
4033 .module = THIS_MODULE,
4035 struct nft_set_dump_ctx *dump_ctx;
4037 dump_ctx = kmalloc(sizeof(*dump_ctx), GFP_ATOMIC);
4041 dump_ctx->set = set;
4042 dump_ctx->ctx = ctx;
4045 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4048 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4051 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4052 err = nft_get_set_elem(&ctx, set, attr);
4060 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4061 const struct nft_set *set,
4062 const struct nft_set_elem *elem,
4063 int event, u16 flags)
4065 struct net *net = ctx->net;
4066 u32 portid = ctx->portid;
4067 struct sk_buff *skb;
4070 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4073 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4077 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
4084 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
4088 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4091 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
4093 struct nft_set *set)
4095 struct nft_trans *trans;
4097 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
4101 nft_trans_elem_set(trans) = set;
4105 void *nft_set_elem_init(const struct nft_set *set,
4106 const struct nft_set_ext_tmpl *tmpl,
4107 const u32 *key, const u32 *data,
4108 u64 timeout, gfp_t gfp)
4110 struct nft_set_ext *ext;
4113 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
4117 ext = nft_set_elem_ext(set, elem);
4118 nft_set_ext_init(ext, tmpl);
4120 memcpy(nft_set_ext_key(ext), key, set->klen);
4121 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4122 memcpy(nft_set_ext_data(ext), data, set->dlen);
4123 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
4124 *nft_set_ext_expiration(ext) =
4125 get_jiffies_64() + timeout;
4126 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
4127 *nft_set_ext_timeout(ext) = timeout;
4132 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
4135 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4136 struct nft_ctx ctx = {
4137 .net = read_pnet(&set->net),
4138 .family = set->table->family,
4141 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
4142 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4143 nft_data_release(nft_set_ext_data(ext), set->dtype);
4144 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) {
4145 struct nft_expr *expr = nft_set_ext_expr(ext);
4147 if (expr->ops->destroy_clone) {
4148 expr->ops->destroy_clone(&ctx, expr);
4149 module_put(expr->ops->type->owner);
4151 nf_tables_expr_destroy(&ctx, expr);
4154 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4155 (*nft_set_ext_obj(ext))->use--;
4158 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
4160 /* Only called from commit path, nft_set_elem_deactivate() already deals with
4161 * the refcounting from the preparation phase.
4163 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
4164 const struct nft_set *set, void *elem)
4166 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4168 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
4169 nf_tables_expr_destroy(ctx, nft_set_ext_expr(ext));
4173 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4174 const struct nlattr *attr, u32 nlmsg_flags)
4176 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4177 u8 genmask = nft_genmask_next(ctx->net);
4178 struct nft_data_desc d1, d2;
4179 struct nft_set_ext_tmpl tmpl;
4180 struct nft_set_ext *ext, *ext2;
4181 struct nft_set_elem elem;
4182 struct nft_set_binding *binding;
4183 struct nft_object *obj = NULL;
4184 struct nft_userdata *udata;
4185 struct nft_data data;
4186 enum nft_registers dreg;
4187 struct nft_trans *trans;
4193 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4194 nft_set_elem_policy, NULL);
4198 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4201 nft_set_ext_prepare(&tmpl);
4203 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4207 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4209 if (set->flags & NFT_SET_MAP) {
4210 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
4211 !(flags & NFT_SET_ELEM_INTERVAL_END))
4213 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
4214 flags & NFT_SET_ELEM_INTERVAL_END)
4217 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4222 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
4223 if (!(set->flags & NFT_SET_TIMEOUT))
4225 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
4229 } else if (set->flags & NFT_SET_TIMEOUT) {
4230 timeout = set->timeout;
4233 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
4234 nla[NFTA_SET_ELEM_KEY]);
4238 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
4241 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
4243 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
4244 if (timeout != set->timeout)
4245 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
4248 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
4249 if (!(set->flags & NFT_SET_OBJECT)) {
4253 obj = nft_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
4254 set->objtype, genmask);
4259 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
4262 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
4263 err = nft_data_init(ctx, &data, sizeof(data), &d2,
4264 nla[NFTA_SET_ELEM_DATA]);
4269 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
4272 dreg = nft_type_to_reg(set->dtype);
4273 list_for_each_entry(binding, &set->bindings, list) {
4274 struct nft_ctx bind_ctx = {
4276 .family = ctx->family,
4277 .table = ctx->table,
4278 .chain = (struct nft_chain *)binding->chain,
4281 if (!(binding->flags & NFT_SET_MAP))
4284 err = nft_validate_register_store(&bind_ctx, dreg,
4290 if (d2.type == NFT_DATA_VERDICT &&
4291 (data.verdict.code == NFT_GOTO ||
4292 data.verdict.code == NFT_JUMP))
4293 nft_validate_state_update(ctx->net,
4297 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
4300 /* The full maximum length of userdata can exceed the maximum
4301 * offset value (U8_MAX) for following extensions, therefor it
4302 * must be the last extension added.
4305 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
4306 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
4308 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
4313 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
4314 timeout, GFP_KERNEL);
4315 if (elem.priv == NULL)
4318 ext = nft_set_elem_ext(set, elem.priv);
4320 *nft_set_ext_flags(ext) = flags;
4322 udata = nft_set_ext_userdata(ext);
4323 udata->len = ulen - 1;
4324 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
4327 *nft_set_ext_obj(ext) = obj;
4331 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
4335 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
4336 err = set->ops->insert(ctx->net, set, &elem, &ext2);
4338 if (err == -EEXIST) {
4339 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
4340 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
4341 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
4342 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
4346 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4347 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
4348 memcmp(nft_set_ext_data(ext),
4349 nft_set_ext_data(ext2), set->dlen) != 0) ||
4350 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4351 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
4352 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
4354 else if (!(nlmsg_flags & NLM_F_EXCL))
4361 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
4366 nft_trans_elem(trans) = elem;
4367 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4371 set->ops->remove(ctx->net, set, &elem);
4377 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4378 nft_data_release(&data, d2.type);
4380 nft_data_release(&elem.key.val, d1.type);
4385 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
4386 struct sk_buff *skb, const struct nlmsghdr *nlh,
4387 const struct nlattr * const nla[],
4388 struct netlink_ext_ack *extack)
4390 u8 genmask = nft_genmask_next(net);
4391 const struct nlattr *attr;
4392 struct nft_set *set;
4396 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
4399 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4404 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4405 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
4407 return PTR_ERR(set);
4409 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4412 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4413 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
4418 if (net->nft.validate_state == NFT_VALIDATE_DO)
4419 return nft_table_validate(net, ctx.table);
4425 * nft_data_hold - hold a nft_data item
4427 * @data: struct nft_data to release
4428 * @type: type of data
4430 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4431 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
4432 * NFT_GOTO verdicts. This function must be called on active data objects
4433 * from the second phase of the commit protocol.
4435 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
4437 if (type == NFT_DATA_VERDICT) {
4438 switch (data->verdict.code) {
4441 data->verdict.chain->use++;
4447 static void nft_set_elem_activate(const struct net *net,
4448 const struct nft_set *set,
4449 struct nft_set_elem *elem)
4451 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4453 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4454 nft_data_hold(nft_set_ext_data(ext), set->dtype);
4455 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4456 (*nft_set_ext_obj(ext))->use++;
4459 static void nft_set_elem_deactivate(const struct net *net,
4460 const struct nft_set *set,
4461 struct nft_set_elem *elem)
4463 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4465 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4466 nft_data_release(nft_set_ext_data(ext), set->dtype);
4467 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4468 (*nft_set_ext_obj(ext))->use--;
4471 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
4472 const struct nlattr *attr)
4474 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4475 struct nft_set_ext_tmpl tmpl;
4476 struct nft_data_desc desc;
4477 struct nft_set_elem elem;
4478 struct nft_set_ext *ext;
4479 struct nft_trans *trans;
4484 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4485 nft_set_elem_policy, NULL);
4490 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4493 nft_set_ext_prepare(&tmpl);
4495 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4499 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4501 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4502 nla[NFTA_SET_ELEM_KEY]);
4507 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4510 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
4513 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
4515 if (elem.priv == NULL)
4518 ext = nft_set_elem_ext(set, elem.priv);
4520 *nft_set_ext_flags(ext) = flags;
4522 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
4523 if (trans == NULL) {
4528 priv = set->ops->deactivate(ctx->net, set, &elem);
4536 nft_set_elem_deactivate(ctx->net, set, &elem);
4538 nft_trans_elem(trans) = elem;
4539 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4547 nft_data_release(&elem.key.val, desc.type);
4552 static int nft_flush_set(const struct nft_ctx *ctx,
4553 struct nft_set *set,
4554 const struct nft_set_iter *iter,
4555 struct nft_set_elem *elem)
4557 struct nft_trans *trans;
4560 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
4561 sizeof(struct nft_trans_elem), GFP_ATOMIC);
4565 if (!set->ops->flush(ctx->net, set, elem->priv)) {
4571 nft_trans_elem_set(trans) = set;
4572 nft_trans_elem(trans) = *elem;
4573 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4581 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
4582 struct sk_buff *skb, const struct nlmsghdr *nlh,
4583 const struct nlattr * const nla[],
4584 struct netlink_ext_ack *extack)
4586 u8 genmask = nft_genmask_next(net);
4587 const struct nlattr *attr;
4588 struct nft_set *set;
4592 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4597 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4599 return PTR_ERR(set);
4600 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4603 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
4604 struct nft_set_iter iter = {
4606 .fn = nft_flush_set,
4608 set->ops->walk(&ctx, set, &iter);
4613 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4614 err = nft_del_setelem(&ctx, set, attr);
4623 void nft_set_gc_batch_release(struct rcu_head *rcu)
4625 struct nft_set_gc_batch *gcb;
4628 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4629 for (i = 0; i < gcb->head.cnt; i++)
4630 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
4633 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4635 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4638 struct nft_set_gc_batch *gcb;
4640 gcb = kzalloc(sizeof(*gcb), gfp);
4643 gcb->head.set = set;
4646 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4653 * nft_register_obj- register nf_tables stateful object type
4656 * Registers the object type for use with nf_tables. Returns zero on
4657 * success or a negative errno code otherwise.
4659 int nft_register_obj(struct nft_object_type *obj_type)
4661 if (obj_type->type == NFT_OBJECT_UNSPEC)
4664 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4665 list_add_rcu(&obj_type->list, &nf_tables_objects);
4666 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4669 EXPORT_SYMBOL_GPL(nft_register_obj);
4672 * nft_unregister_obj - unregister nf_tables object type
4675 * Unregisters the object type for use with nf_tables.
4677 void nft_unregister_obj(struct nft_object_type *obj_type)
4679 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4680 list_del_rcu(&obj_type->list);
4681 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4683 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4685 struct nft_object *nft_obj_lookup(const struct nft_table *table,
4686 const struct nlattr *nla, u32 objtype,
4689 struct nft_object *obj;
4691 list_for_each_entry_rcu(obj, &table->objects, list) {
4692 if (!nla_strcmp(nla, obj->name) &&
4693 objtype == obj->ops->type->type &&
4694 nft_active_genmask(obj, genmask))
4697 return ERR_PTR(-ENOENT);
4699 EXPORT_SYMBOL_GPL(nft_obj_lookup);
4701 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
4702 const struct nlattr *nla,
4703 u32 objtype, u8 genmask)
4705 struct nft_object *obj;
4707 list_for_each_entry(obj, &table->objects, list) {
4708 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
4709 objtype == obj->ops->type->type &&
4710 nft_active_genmask(obj, genmask))
4713 return ERR_PTR(-ENOENT);
4716 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4717 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4718 .len = NFT_TABLE_MAXNAMELEN - 1 },
4719 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4720 .len = NFT_OBJ_MAXNAMELEN - 1 },
4721 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4722 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4723 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
4726 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4727 const struct nft_object_type *type,
4728 const struct nlattr *attr)
4731 const struct nft_object_ops *ops;
4732 struct nft_object *obj;
4735 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
4740 err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
4745 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4748 if (type->select_ops) {
4749 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
4759 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
4763 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
4776 return ERR_PTR(err);
4779 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
4780 struct nft_object *obj, bool reset)
4782 struct nlattr *nest;
4784 nest = nla_nest_start(skb, attr);
4786 goto nla_put_failure;
4787 if (obj->ops->dump(skb, obj, reset) < 0)
4788 goto nla_put_failure;
4789 nla_nest_end(skb, nest);
4796 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4798 const struct nft_object_type *type;
4800 list_for_each_entry(type, &nf_tables_objects, list) {
4801 if (objtype == type->type)
4807 static const struct nft_object_type *
4808 nft_obj_type_get(struct net *net, u32 objtype)
4810 const struct nft_object_type *type;
4812 type = __nft_obj_type_get(objtype);
4813 if (type != NULL && try_module_get(type->owner))
4816 #ifdef CONFIG_MODULES
4818 nft_request_module(net, "nft-obj-%u", objtype);
4819 if (__nft_obj_type_get(objtype))
4820 return ERR_PTR(-EAGAIN);
4823 return ERR_PTR(-ENOENT);
4826 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4827 struct sk_buff *skb, const struct nlmsghdr *nlh,
4828 const struct nlattr * const nla[],
4829 struct netlink_ext_ack *extack)
4831 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4832 const struct nft_object_type *type;
4833 u8 genmask = nft_genmask_next(net);
4834 int family = nfmsg->nfgen_family;
4835 struct nft_table *table;
4836 struct nft_object *obj;
4841 if (!nla[NFTA_OBJ_TYPE] ||
4842 !nla[NFTA_OBJ_NAME] ||
4843 !nla[NFTA_OBJ_DATA])
4846 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
4847 if (IS_ERR(table)) {
4848 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
4849 return PTR_ERR(table);
4852 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4853 obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4856 if (err != -ENOENT) {
4857 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
4861 if (nlh->nlmsg_flags & NLM_F_EXCL) {
4862 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
4868 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
4870 type = nft_obj_type_get(net, objtype);
4872 return PTR_ERR(type);
4874 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
4880 obj->handle = nf_tables_alloc_handle(table);
4882 obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
4888 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4892 list_add_tail_rcu(&obj->list, &table->objects);
4898 if (obj->ops->destroy)
4899 obj->ops->destroy(&ctx, obj);
4902 module_put(type->owner);
4906 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4907 u32 portid, u32 seq, int event, u32 flags,
4908 int family, const struct nft_table *table,
4909 struct nft_object *obj, bool reset)
4911 struct nfgenmsg *nfmsg;
4912 struct nlmsghdr *nlh;
4914 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4915 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4917 goto nla_put_failure;
4919 nfmsg = nlmsg_data(nlh);
4920 nfmsg->nfgen_family = family;
4921 nfmsg->version = NFNETLINK_V0;
4922 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4924 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4925 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
4926 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
4927 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
4928 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
4929 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
4931 goto nla_put_failure;
4933 nlmsg_end(skb, nlh);
4937 nlmsg_trim(skb, nlh);
4941 struct nft_obj_filter {
4946 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4948 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4949 const struct nft_table *table;
4950 unsigned int idx = 0, s_idx = cb->args[0];
4951 struct nft_obj_filter *filter = cb->data;
4952 struct net *net = sock_net(skb->sk);
4953 int family = nfmsg->nfgen_family;
4954 struct nft_object *obj;
4957 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4961 cb->seq = net->nft.base_seq;
4963 list_for_each_entry_rcu(table, &net->nft.tables, list) {
4964 if (family != NFPROTO_UNSPEC && family != table->family)
4967 list_for_each_entry_rcu(obj, &table->objects, list) {
4968 if (!nft_is_active(net, obj))
4973 memset(&cb->args[1], 0,
4974 sizeof(cb->args) - sizeof(cb->args[0]));
4975 if (filter && filter->table &&
4976 strcmp(filter->table, table->name))
4979 filter->type != NFT_OBJECT_UNSPEC &&
4980 obj->ops->type->type != filter->type)
4983 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4986 NLM_F_MULTI | NLM_F_APPEND,
4987 table->family, table,
4991 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5003 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
5005 struct nft_obj_filter *filter = cb->data;
5008 kfree(filter->table);
5015 static struct nft_obj_filter *
5016 nft_obj_filter_alloc(const struct nlattr * const nla[])
5018 struct nft_obj_filter *filter;
5020 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5022 return ERR_PTR(-ENOMEM);
5024 if (nla[NFTA_OBJ_TABLE]) {
5025 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
5026 if (!filter->table) {
5028 return ERR_PTR(-ENOMEM);
5031 if (nla[NFTA_OBJ_TYPE])
5032 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5037 /* called with rcu_read_lock held */
5038 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
5039 struct sk_buff *skb, const struct nlmsghdr *nlh,
5040 const struct nlattr * const nla[],
5041 struct netlink_ext_ack *extack)
5043 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5044 u8 genmask = nft_genmask_cur(net);
5045 int family = nfmsg->nfgen_family;
5046 const struct nft_table *table;
5047 struct nft_object *obj;
5048 struct sk_buff *skb2;
5053 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5054 struct netlink_dump_control c = {
5055 .dump = nf_tables_dump_obj,
5056 .done = nf_tables_dump_obj_done,
5057 .module = THIS_MODULE,
5060 if (nla[NFTA_OBJ_TABLE] ||
5061 nla[NFTA_OBJ_TYPE]) {
5062 struct nft_obj_filter *filter;
5064 filter = nft_obj_filter_alloc(nla);
5070 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5073 if (!nla[NFTA_OBJ_NAME] ||
5074 !nla[NFTA_OBJ_TYPE])
5077 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5078 if (IS_ERR(table)) {
5079 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5080 return PTR_ERR(table);
5083 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5084 obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
5086 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5087 return PTR_ERR(obj);
5090 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5094 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5097 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
5098 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
5099 family, table, obj, reset);
5103 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5109 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
5111 if (obj->ops->destroy)
5112 obj->ops->destroy(ctx, obj);
5114 module_put(obj->ops->type->owner);
5119 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
5120 struct sk_buff *skb, const struct nlmsghdr *nlh,
5121 const struct nlattr * const nla[],
5122 struct netlink_ext_ack *extack)
5124 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5125 u8 genmask = nft_genmask_next(net);
5126 int family = nfmsg->nfgen_family;
5127 const struct nlattr *attr;
5128 struct nft_table *table;
5129 struct nft_object *obj;
5133 if (!nla[NFTA_OBJ_TYPE] ||
5134 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
5137 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5138 if (IS_ERR(table)) {
5139 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5140 return PTR_ERR(table);
5143 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5144 if (nla[NFTA_OBJ_HANDLE]) {
5145 attr = nla[NFTA_OBJ_HANDLE];
5146 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
5148 attr = nla[NFTA_OBJ_NAME];
5149 obj = nft_obj_lookup(table, attr, objtype, genmask);
5153 NL_SET_BAD_ATTR(extack, attr);
5154 return PTR_ERR(obj);
5157 NL_SET_BAD_ATTR(extack, attr);
5161 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5163 return nft_delobj(&ctx, obj);
5166 void nft_obj_notify(struct net *net, struct nft_table *table,
5167 struct nft_object *obj, u32 portid, u32 seq, int event,
5168 int family, int report, gfp_t gfp)
5170 struct sk_buff *skb;
5174 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5177 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
5181 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
5188 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
5191 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5193 EXPORT_SYMBOL_GPL(nft_obj_notify);
5195 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
5196 struct nft_object *obj, int event)
5198 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
5199 ctx->family, ctx->report, GFP_KERNEL);
5205 void nft_register_flowtable_type(struct nf_flowtable_type *type)
5207 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5208 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
5209 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5211 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
5213 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
5215 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5216 list_del_rcu(&type->list);
5217 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5219 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
5221 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
5222 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
5223 .len = NFT_NAME_MAXLEN - 1 },
5224 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
5225 .len = NFT_NAME_MAXLEN - 1 },
5226 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
5227 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
5230 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
5231 const struct nlattr *nla, u8 genmask)
5233 struct nft_flowtable *flowtable;
5235 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5236 if (!nla_strcmp(nla, flowtable->name) &&
5237 nft_active_genmask(flowtable, genmask))
5240 return ERR_PTR(-ENOENT);
5242 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
5244 static struct nft_flowtable *
5245 nft_flowtable_lookup_byhandle(const struct nft_table *table,
5246 const struct nlattr *nla, u8 genmask)
5248 struct nft_flowtable *flowtable;
5250 list_for_each_entry(flowtable, &table->flowtables, list) {
5251 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
5252 nft_active_genmask(flowtable, genmask))
5255 return ERR_PTR(-ENOENT);
5258 static int nf_tables_parse_devices(const struct nft_ctx *ctx,
5259 const struct nlattr *attr,
5260 struct net_device *dev_array[], int *len)
5262 const struct nlattr *tmp;
5263 struct net_device *dev;
5264 char ifname[IFNAMSIZ];
5265 int rem, n = 0, err;
5267 nla_for_each_nested(tmp, attr, rem) {
5268 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
5273 nla_strlcpy(ifname, tmp, IFNAMSIZ);
5274 dev = __dev_get_by_name(ctx->net, ifname);
5280 dev_array[n++] = dev;
5281 if (n == NFT_FLOWTABLE_DEVICE_MAX) {
5295 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
5296 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
5297 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
5298 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
5301 static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx,
5302 const struct nlattr *attr,
5303 struct nft_flowtable *flowtable)
5305 struct net_device *dev_array[NFT_FLOWTABLE_DEVICE_MAX];
5306 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
5307 struct nf_hook_ops *ops;
5308 int hooknum, priority;
5311 err = nla_parse_nested(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
5312 nft_flowtable_hook_policy, NULL);
5316 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
5317 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] ||
5318 !tb[NFTA_FLOWTABLE_HOOK_DEVS])
5321 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
5322 if (hooknum != NF_NETDEV_INGRESS)
5325 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
5327 err = nf_tables_parse_devices(ctx, tb[NFTA_FLOWTABLE_HOOK_DEVS],
5332 ops = kcalloc(n, sizeof(struct nf_hook_ops), GFP_KERNEL);
5336 flowtable->hooknum = hooknum;
5337 flowtable->priority = priority;
5338 flowtable->ops = ops;
5339 flowtable->ops_len = n;
5341 for (i = 0; i < n; i++) {
5342 flowtable->ops[i].pf = NFPROTO_NETDEV;
5343 flowtable->ops[i].hooknum = hooknum;
5344 flowtable->ops[i].priority = priority;
5345 flowtable->ops[i].priv = &flowtable->data;
5346 flowtable->ops[i].hook = flowtable->data.type->hook;
5347 flowtable->ops[i].dev = dev_array[i];
5348 flowtable->dev_name[i] = kstrdup(dev_array[i]->name,
5355 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
5357 const struct nf_flowtable_type *type;
5359 list_for_each_entry(type, &nf_tables_flowtables, list) {
5360 if (family == type->family)
5366 static const struct nf_flowtable_type *
5367 nft_flowtable_type_get(struct net *net, u8 family)
5369 const struct nf_flowtable_type *type;
5371 type = __nft_flowtable_type_get(family);
5372 if (type != NULL && try_module_get(type->owner))
5375 #ifdef CONFIG_MODULES
5377 nft_request_module(net, "nf-flowtable-%u", family);
5378 if (__nft_flowtable_type_get(family))
5379 return ERR_PTR(-EAGAIN);
5382 return ERR_PTR(-ENOENT);
5385 static void nft_unregister_flowtable_net_hooks(struct net *net,
5386 struct nft_flowtable *flowtable)
5390 for (i = 0; i < flowtable->ops_len; i++) {
5391 if (!flowtable->ops[i].dev)
5394 nf_unregister_net_hook(net, &flowtable->ops[i]);
5398 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
5399 struct sk_buff *skb,
5400 const struct nlmsghdr *nlh,
5401 const struct nlattr * const nla[],
5402 struct netlink_ext_ack *extack)
5404 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5405 const struct nf_flowtable_type *type;
5406 struct nft_flowtable *flowtable, *ft;
5407 u8 genmask = nft_genmask_next(net);
5408 int family = nfmsg->nfgen_family;
5409 struct nft_table *table;
5413 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5414 !nla[NFTA_FLOWTABLE_NAME] ||
5415 !nla[NFTA_FLOWTABLE_HOOK])
5418 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5420 if (IS_ERR(table)) {
5421 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5422 return PTR_ERR(table);
5425 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5427 if (IS_ERR(flowtable)) {
5428 err = PTR_ERR(flowtable);
5429 if (err != -ENOENT) {
5430 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5434 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5435 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5442 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5444 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
5448 flowtable->table = table;
5449 flowtable->handle = nf_tables_alloc_handle(table);
5451 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
5452 if (!flowtable->name) {
5457 type = nft_flowtable_type_get(net, family);
5459 err = PTR_ERR(type);
5463 flowtable->data.type = type;
5464 err = type->init(&flowtable->data);
5468 err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
5473 for (i = 0; i < flowtable->ops_len; i++) {
5474 if (!flowtable->ops[i].dev)
5477 list_for_each_entry(ft, &table->flowtables, list) {
5478 for (k = 0; k < ft->ops_len; k++) {
5479 if (!ft->ops[k].dev)
5482 if (flowtable->ops[i].dev == ft->ops[k].dev &&
5483 flowtable->ops[i].pf == ft->ops[k].pf) {
5490 err = nf_register_net_hook(net, &flowtable->ops[i]);
5495 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
5499 list_add_tail_rcu(&flowtable->list, &table->flowtables);
5504 i = flowtable->ops_len;
5506 for (k = i - 1; k >= 0; k--) {
5507 kfree(flowtable->dev_name[k]);
5508 nf_unregister_net_hook(net, &flowtable->ops[k]);
5511 kfree(flowtable->ops);
5513 flowtable->data.type->free(&flowtable->data);
5515 module_put(type->owner);
5517 kfree(flowtable->name);
5523 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
5524 struct sk_buff *skb,
5525 const struct nlmsghdr *nlh,
5526 const struct nlattr * const nla[],
5527 struct netlink_ext_ack *extack)
5529 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5530 u8 genmask = nft_genmask_next(net);
5531 int family = nfmsg->nfgen_family;
5532 struct nft_flowtable *flowtable;
5533 const struct nlattr *attr;
5534 struct nft_table *table;
5537 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5538 (!nla[NFTA_FLOWTABLE_NAME] &&
5539 !nla[NFTA_FLOWTABLE_HANDLE]))
5542 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5544 if (IS_ERR(table)) {
5545 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5546 return PTR_ERR(table);
5549 if (nla[NFTA_FLOWTABLE_HANDLE]) {
5550 attr = nla[NFTA_FLOWTABLE_HANDLE];
5551 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
5553 attr = nla[NFTA_FLOWTABLE_NAME];
5554 flowtable = nft_flowtable_lookup(table, attr, genmask);
5557 if (IS_ERR(flowtable)) {
5558 NL_SET_BAD_ATTR(extack, attr);
5559 return PTR_ERR(flowtable);
5561 if (flowtable->use > 0) {
5562 NL_SET_BAD_ATTR(extack, attr);
5566 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5568 return nft_delflowtable(&ctx, flowtable);
5571 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
5572 u32 portid, u32 seq, int event,
5573 u32 flags, int family,
5574 struct nft_flowtable *flowtable)
5576 struct nlattr *nest, *nest_devs;
5577 struct nfgenmsg *nfmsg;
5578 struct nlmsghdr *nlh;
5581 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5582 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5584 goto nla_put_failure;
5586 nfmsg = nlmsg_data(nlh);
5587 nfmsg->nfgen_family = family;
5588 nfmsg->version = NFNETLINK_V0;
5589 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5591 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
5592 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
5593 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
5594 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
5595 NFTA_FLOWTABLE_PAD))
5596 goto nla_put_failure;
5598 nest = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK);
5599 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
5600 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->priority)))
5601 goto nla_put_failure;
5603 nest_devs = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK_DEVS);
5605 goto nla_put_failure;
5607 for (i = 0; i < flowtable->ops_len; i++) {
5608 if (flowtable->dev_name[i][0] &&
5609 nla_put_string(skb, NFTA_DEVICE_NAME,
5610 flowtable->dev_name[i]))
5611 goto nla_put_failure;
5613 nla_nest_end(skb, nest_devs);
5614 nla_nest_end(skb, nest);
5616 nlmsg_end(skb, nlh);
5620 nlmsg_trim(skb, nlh);
5624 struct nft_flowtable_filter {
5628 static int nf_tables_dump_flowtable(struct sk_buff *skb,
5629 struct netlink_callback *cb)
5631 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5632 struct nft_flowtable_filter *filter = cb->data;
5633 unsigned int idx = 0, s_idx = cb->args[0];
5634 struct net *net = sock_net(skb->sk);
5635 int family = nfmsg->nfgen_family;
5636 struct nft_flowtable *flowtable;
5637 const struct nft_table *table;
5640 cb->seq = net->nft.base_seq;
5642 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5643 if (family != NFPROTO_UNSPEC && family != table->family)
5646 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5647 if (!nft_is_active(net, flowtable))
5652 memset(&cb->args[1], 0,
5653 sizeof(cb->args) - sizeof(cb->args[0]));
5654 if (filter && filter->table &&
5655 strcmp(filter->table, table->name))
5658 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
5660 NFT_MSG_NEWFLOWTABLE,
5661 NLM_F_MULTI | NLM_F_APPEND,
5662 table->family, flowtable) < 0)
5665 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5677 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
5679 struct nft_flowtable_filter *filter = cb->data;
5684 kfree(filter->table);
5690 static struct nft_flowtable_filter *
5691 nft_flowtable_filter_alloc(const struct nlattr * const nla[])
5693 struct nft_flowtable_filter *filter;
5695 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5697 return ERR_PTR(-ENOMEM);
5699 if (nla[NFTA_FLOWTABLE_TABLE]) {
5700 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
5702 if (!filter->table) {
5704 return ERR_PTR(-ENOMEM);
5710 /* called with rcu_read_lock held */
5711 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
5712 struct sk_buff *skb,
5713 const struct nlmsghdr *nlh,
5714 const struct nlattr * const nla[],
5715 struct netlink_ext_ack *extack)
5717 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5718 u8 genmask = nft_genmask_cur(net);
5719 int family = nfmsg->nfgen_family;
5720 struct nft_flowtable *flowtable;
5721 const struct nft_table *table;
5722 struct sk_buff *skb2;
5725 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5726 struct netlink_dump_control c = {
5727 .dump = nf_tables_dump_flowtable,
5728 .done = nf_tables_dump_flowtable_done,
5729 .module = THIS_MODULE,
5732 if (nla[NFTA_FLOWTABLE_TABLE]) {
5733 struct nft_flowtable_filter *filter;
5735 filter = nft_flowtable_filter_alloc(nla);
5741 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5744 if (!nla[NFTA_FLOWTABLE_NAME])
5747 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5750 return PTR_ERR(table);
5752 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5754 if (IS_ERR(flowtable))
5755 return PTR_ERR(flowtable);
5757 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5761 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
5763 NFT_MSG_NEWFLOWTABLE, 0, family,
5768 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5774 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
5775 struct nft_flowtable *flowtable,
5778 struct sk_buff *skb;
5782 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
5785 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5789 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
5791 ctx->family, flowtable);
5797 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
5798 ctx->report, GFP_KERNEL);
5801 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
5804 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
5806 kfree(flowtable->ops);
5807 kfree(flowtable->name);
5808 flowtable->data.type->free(&flowtable->data);
5809 module_put(flowtable->data.type->owner);
5812 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
5813 u32 portid, u32 seq)
5815 struct nlmsghdr *nlh;
5816 struct nfgenmsg *nfmsg;
5817 char buf[TASK_COMM_LEN];
5818 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
5820 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
5822 goto nla_put_failure;
5824 nfmsg = nlmsg_data(nlh);
5825 nfmsg->nfgen_family = AF_UNSPEC;
5826 nfmsg->version = NFNETLINK_V0;
5827 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5829 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
5830 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
5831 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
5832 goto nla_put_failure;
5834 nlmsg_end(skb, nlh);
5838 nlmsg_trim(skb, nlh);
5842 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
5843 struct nft_flowtable *flowtable)
5847 for (i = 0; i < flowtable->ops_len; i++) {
5848 if (flowtable->ops[i].dev != dev)
5851 nf_unregister_net_hook(dev_net(dev), &flowtable->ops[i]);
5852 flowtable->dev_name[i][0] = '\0';
5853 flowtable->ops[i].dev = NULL;
5858 static int nf_tables_flowtable_event(struct notifier_block *this,
5859 unsigned long event, void *ptr)
5861 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
5862 struct nft_flowtable *flowtable;
5863 struct nft_table *table;
5866 if (event != NETDEV_UNREGISTER)
5869 net = maybe_get_net(dev_net(dev));
5873 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5874 list_for_each_entry(table, &net->nft.tables, list) {
5875 list_for_each_entry(flowtable, &table->flowtables, list) {
5876 nft_flowtable_event(event, dev, flowtable);
5879 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5884 static struct notifier_block nf_tables_flowtable_notifier = {
5885 .notifier_call = nf_tables_flowtable_event,
5888 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
5891 struct nlmsghdr *nlh = nlmsg_hdr(skb);
5892 struct sk_buff *skb2;
5895 if (nlmsg_report(nlh) &&
5896 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5899 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5903 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
5910 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
5911 nlmsg_report(nlh), GFP_KERNEL);
5914 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
5918 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
5919 struct sk_buff *skb, const struct nlmsghdr *nlh,
5920 const struct nlattr * const nla[],
5921 struct netlink_ext_ack *extack)
5923 struct sk_buff *skb2;
5926 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5930 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
5935 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5941 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
5942 [NFT_MSG_NEWTABLE] = {
5943 .call_batch = nf_tables_newtable,
5944 .attr_count = NFTA_TABLE_MAX,
5945 .policy = nft_table_policy,
5947 [NFT_MSG_GETTABLE] = {
5948 .call_rcu = nf_tables_gettable,
5949 .attr_count = NFTA_TABLE_MAX,
5950 .policy = nft_table_policy,
5952 [NFT_MSG_DELTABLE] = {
5953 .call_batch = nf_tables_deltable,
5954 .attr_count = NFTA_TABLE_MAX,
5955 .policy = nft_table_policy,
5957 [NFT_MSG_NEWCHAIN] = {
5958 .call_batch = nf_tables_newchain,
5959 .attr_count = NFTA_CHAIN_MAX,
5960 .policy = nft_chain_policy,
5962 [NFT_MSG_GETCHAIN] = {
5963 .call_rcu = nf_tables_getchain,
5964 .attr_count = NFTA_CHAIN_MAX,
5965 .policy = nft_chain_policy,
5967 [NFT_MSG_DELCHAIN] = {
5968 .call_batch = nf_tables_delchain,
5969 .attr_count = NFTA_CHAIN_MAX,
5970 .policy = nft_chain_policy,
5972 [NFT_MSG_NEWRULE] = {
5973 .call_batch = nf_tables_newrule,
5974 .attr_count = NFTA_RULE_MAX,
5975 .policy = nft_rule_policy,
5977 [NFT_MSG_GETRULE] = {
5978 .call_rcu = nf_tables_getrule,
5979 .attr_count = NFTA_RULE_MAX,
5980 .policy = nft_rule_policy,
5982 [NFT_MSG_DELRULE] = {
5983 .call_batch = nf_tables_delrule,
5984 .attr_count = NFTA_RULE_MAX,
5985 .policy = nft_rule_policy,
5987 [NFT_MSG_NEWSET] = {
5988 .call_batch = nf_tables_newset,
5989 .attr_count = NFTA_SET_MAX,
5990 .policy = nft_set_policy,
5992 [NFT_MSG_GETSET] = {
5993 .call_rcu = nf_tables_getset,
5994 .attr_count = NFTA_SET_MAX,
5995 .policy = nft_set_policy,
5997 [NFT_MSG_DELSET] = {
5998 .call_batch = nf_tables_delset,
5999 .attr_count = NFTA_SET_MAX,
6000 .policy = nft_set_policy,
6002 [NFT_MSG_NEWSETELEM] = {
6003 .call_batch = nf_tables_newsetelem,
6004 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6005 .policy = nft_set_elem_list_policy,
6007 [NFT_MSG_GETSETELEM] = {
6008 .call_rcu = nf_tables_getsetelem,
6009 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6010 .policy = nft_set_elem_list_policy,
6012 [NFT_MSG_DELSETELEM] = {
6013 .call_batch = nf_tables_delsetelem,
6014 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6015 .policy = nft_set_elem_list_policy,
6017 [NFT_MSG_GETGEN] = {
6018 .call_rcu = nf_tables_getgen,
6020 [NFT_MSG_NEWOBJ] = {
6021 .call_batch = nf_tables_newobj,
6022 .attr_count = NFTA_OBJ_MAX,
6023 .policy = nft_obj_policy,
6025 [NFT_MSG_GETOBJ] = {
6026 .call_rcu = nf_tables_getobj,
6027 .attr_count = NFTA_OBJ_MAX,
6028 .policy = nft_obj_policy,
6030 [NFT_MSG_DELOBJ] = {
6031 .call_batch = nf_tables_delobj,
6032 .attr_count = NFTA_OBJ_MAX,
6033 .policy = nft_obj_policy,
6035 [NFT_MSG_GETOBJ_RESET] = {
6036 .call_rcu = nf_tables_getobj,
6037 .attr_count = NFTA_OBJ_MAX,
6038 .policy = nft_obj_policy,
6040 [NFT_MSG_NEWFLOWTABLE] = {
6041 .call_batch = nf_tables_newflowtable,
6042 .attr_count = NFTA_FLOWTABLE_MAX,
6043 .policy = nft_flowtable_policy,
6045 [NFT_MSG_GETFLOWTABLE] = {
6046 .call_rcu = nf_tables_getflowtable,
6047 .attr_count = NFTA_FLOWTABLE_MAX,
6048 .policy = nft_flowtable_policy,
6050 [NFT_MSG_DELFLOWTABLE] = {
6051 .call_batch = nf_tables_delflowtable,
6052 .attr_count = NFTA_FLOWTABLE_MAX,
6053 .policy = nft_flowtable_policy,
6057 static int nf_tables_validate(struct net *net)
6059 struct nft_table *table;
6061 switch (net->nft.validate_state) {
6062 case NFT_VALIDATE_SKIP:
6064 case NFT_VALIDATE_NEED:
6065 nft_validate_state_update(net, NFT_VALIDATE_DO);
6067 case NFT_VALIDATE_DO:
6068 list_for_each_entry(table, &net->nft.tables, list) {
6069 if (nft_table_validate(net, table) < 0)
6078 static void nft_chain_commit_update(struct nft_trans *trans)
6080 struct nft_base_chain *basechain;
6082 if (nft_trans_chain_name(trans)) {
6083 rhltable_remove(&trans->ctx.table->chains_ht,
6084 &trans->ctx.chain->rhlhead,
6085 nft_chain_ht_params);
6086 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
6087 rhltable_insert_key(&trans->ctx.table->chains_ht,
6088 trans->ctx.chain->name,
6089 &trans->ctx.chain->rhlhead,
6090 nft_chain_ht_params);
6093 if (!nft_is_base_chain(trans->ctx.chain))
6096 basechain = nft_base_chain(trans->ctx.chain);
6097 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
6099 switch (nft_trans_chain_policy(trans)) {
6102 basechain->policy = nft_trans_chain_policy(trans);
6107 static void nft_commit_release(struct nft_trans *trans)
6109 switch (trans->msg_type) {
6110 case NFT_MSG_DELTABLE:
6111 nf_tables_table_destroy(&trans->ctx);
6113 case NFT_MSG_DELCHAIN:
6114 nf_tables_chain_destroy(&trans->ctx);
6116 case NFT_MSG_DELRULE:
6117 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6119 case NFT_MSG_DELSET:
6120 nft_set_destroy(nft_trans_set(trans));
6122 case NFT_MSG_DELSETELEM:
6123 nf_tables_set_elem_destroy(&trans->ctx,
6124 nft_trans_elem_set(trans),
6125 nft_trans_elem(trans).priv);
6127 case NFT_MSG_DELOBJ:
6128 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6130 case NFT_MSG_DELFLOWTABLE:
6131 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6137 static void nf_tables_commit_release(struct net *net)
6139 struct nft_trans *trans, *next;
6141 if (list_empty(&net->nft.commit_list))
6146 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6147 list_del(&trans->list);
6148 nft_commit_release(trans);
6152 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
6154 struct nft_rule *rule;
6155 unsigned int alloc = 0;
6158 /* already handled or inactive chain? */
6159 if (chain->rules_next || !nft_is_active_next(net, chain))
6162 rule = list_entry(&chain->rules, struct nft_rule, list);
6165 list_for_each_entry_continue(rule, &chain->rules, list) {
6166 if (nft_is_active_next(net, rule))
6170 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
6171 if (!chain->rules_next)
6174 list_for_each_entry_continue(rule, &chain->rules, list) {
6175 if (nft_is_active_next(net, rule))
6176 chain->rules_next[i++] = rule;
6179 chain->rules_next[i] = NULL;
6183 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
6185 struct nft_trans *trans, *next;
6187 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6188 struct nft_chain *chain = trans->ctx.chain;
6190 if (trans->msg_type == NFT_MSG_NEWRULE ||
6191 trans->msg_type == NFT_MSG_DELRULE) {
6192 kvfree(chain->rules_next);
6193 chain->rules_next = NULL;
6198 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
6200 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
6205 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
6207 struct nft_rule **r = rules;
6208 struct nft_rules_old *old;
6213 r++; /* rcu_head is after end marker */
6217 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
6220 static void nf_tables_commit_chain_active(struct net *net, struct nft_chain *chain)
6222 struct nft_rule **g0, **g1;
6225 next_genbit = nft_gencursor_next(net);
6227 g0 = rcu_dereference_protected(chain->rules_gen_0,
6228 lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
6229 g1 = rcu_dereference_protected(chain->rules_gen_1,
6230 lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
6232 /* No changes to this chain? */
6233 if (chain->rules_next == NULL) {
6234 /* chain had no change in last or next generation */
6238 * chain had no change in this generation; make sure next
6239 * one uses same rules as current generation.
6242 rcu_assign_pointer(chain->rules_gen_1, g0);
6243 nf_tables_commit_chain_free_rules_old(g1);
6245 rcu_assign_pointer(chain->rules_gen_0, g1);
6246 nf_tables_commit_chain_free_rules_old(g0);
6253 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
6255 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
6257 chain->rules_next = NULL;
6263 nf_tables_commit_chain_free_rules_old(g1);
6265 nf_tables_commit_chain_free_rules_old(g0);
6268 static void nft_chain_del(struct nft_chain *chain)
6270 struct nft_table *table = chain->table;
6272 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
6273 nft_chain_ht_params));
6274 list_del_rcu(&chain->list);
6277 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
6279 struct nft_trans *trans, *next;
6280 struct nft_trans_elem *te;
6281 struct nft_chain *chain;
6282 struct nft_table *table;
6284 /* 0. Validate ruleset, otherwise roll back for error reporting. */
6285 if (nf_tables_validate(net) < 0)
6288 /* 1. Allocate space for next generation rules_gen_X[] */
6289 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6292 if (trans->msg_type == NFT_MSG_NEWRULE ||
6293 trans->msg_type == NFT_MSG_DELRULE) {
6294 chain = trans->ctx.chain;
6296 ret = nf_tables_commit_chain_prepare(net, chain);
6298 nf_tables_commit_chain_prepare_cancel(net);
6304 /* step 2. Make rules_gen_X visible to packet path */
6305 list_for_each_entry(table, &net->nft.tables, list) {
6306 list_for_each_entry(chain, &table->chains, list) {
6307 if (!nft_is_active_next(net, chain))
6309 nf_tables_commit_chain_active(net, chain);
6314 * Bump generation counter, invalidate any dump in progress.
6315 * Cannot fail after this point.
6317 while (++net->nft.base_seq == 0);
6319 /* step 3. Start new generation, rules_gen_X now in use. */
6320 net->nft.gencursor = nft_gencursor_next(net);
6322 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6323 switch (trans->msg_type) {
6324 case NFT_MSG_NEWTABLE:
6325 if (nft_trans_table_update(trans)) {
6326 if (!nft_trans_table_enable(trans)) {
6327 nf_tables_table_disable(net,
6329 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6332 nft_clear(net, trans->ctx.table);
6334 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
6335 nft_trans_destroy(trans);
6337 case NFT_MSG_DELTABLE:
6338 list_del_rcu(&trans->ctx.table->list);
6339 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
6341 case NFT_MSG_NEWCHAIN:
6342 if (nft_trans_chain_update(trans))
6343 nft_chain_commit_update(trans);
6345 nft_clear(net, trans->ctx.chain);
6347 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6348 nft_trans_destroy(trans);
6350 case NFT_MSG_DELCHAIN:
6351 nft_chain_del(trans->ctx.chain);
6352 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
6353 nf_tables_unregister_hook(trans->ctx.net,
6357 case NFT_MSG_NEWRULE:
6358 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6359 nf_tables_rule_notify(&trans->ctx,
6360 nft_trans_rule(trans),
6362 nft_trans_destroy(trans);
6364 case NFT_MSG_DELRULE:
6365 list_del_rcu(&nft_trans_rule(trans)->list);
6366 nf_tables_rule_notify(&trans->ctx,
6367 nft_trans_rule(trans),
6370 case NFT_MSG_NEWSET:
6371 nft_clear(net, nft_trans_set(trans));
6372 /* This avoids hitting -EBUSY when deleting the table
6373 * from the transaction.
6375 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
6376 !list_empty(&nft_trans_set(trans)->bindings))
6377 trans->ctx.table->use--;
6379 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6380 NFT_MSG_NEWSET, GFP_KERNEL);
6381 nft_trans_destroy(trans);
6383 case NFT_MSG_DELSET:
6384 list_del_rcu(&nft_trans_set(trans)->list);
6385 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6386 NFT_MSG_DELSET, GFP_KERNEL);
6388 case NFT_MSG_NEWSETELEM:
6389 te = (struct nft_trans_elem *)trans->data;
6391 te->set->ops->activate(net, te->set, &te->elem);
6392 nf_tables_setelem_notify(&trans->ctx, te->set,
6394 NFT_MSG_NEWSETELEM, 0);
6395 nft_trans_destroy(trans);
6397 case NFT_MSG_DELSETELEM:
6398 te = (struct nft_trans_elem *)trans->data;
6400 nf_tables_setelem_notify(&trans->ctx, te->set,
6402 NFT_MSG_DELSETELEM, 0);
6403 te->set->ops->remove(net, te->set, &te->elem);
6404 atomic_dec(&te->set->nelems);
6407 case NFT_MSG_NEWOBJ:
6408 nft_clear(net, nft_trans_obj(trans));
6409 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6411 nft_trans_destroy(trans);
6413 case NFT_MSG_DELOBJ:
6414 list_del_rcu(&nft_trans_obj(trans)->list);
6415 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6418 case NFT_MSG_NEWFLOWTABLE:
6419 nft_clear(net, nft_trans_flowtable(trans));
6420 nf_tables_flowtable_notify(&trans->ctx,
6421 nft_trans_flowtable(trans),
6422 NFT_MSG_NEWFLOWTABLE);
6423 nft_trans_destroy(trans);
6425 case NFT_MSG_DELFLOWTABLE:
6426 list_del_rcu(&nft_trans_flowtable(trans)->list);
6427 nf_tables_flowtable_notify(&trans->ctx,
6428 nft_trans_flowtable(trans),
6429 NFT_MSG_DELFLOWTABLE);
6430 nft_unregister_flowtable_net_hooks(net,
6431 nft_trans_flowtable(trans));
6436 nf_tables_commit_release(net);
6437 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
6442 static void nf_tables_abort_release(struct nft_trans *trans)
6444 switch (trans->msg_type) {
6445 case NFT_MSG_NEWTABLE:
6446 nf_tables_table_destroy(&trans->ctx);
6448 case NFT_MSG_NEWCHAIN:
6449 nf_tables_chain_destroy(&trans->ctx);
6451 case NFT_MSG_NEWRULE:
6452 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6454 case NFT_MSG_NEWSET:
6455 nft_set_destroy(nft_trans_set(trans));
6457 case NFT_MSG_NEWSETELEM:
6458 nft_set_elem_destroy(nft_trans_elem_set(trans),
6459 nft_trans_elem(trans).priv, true);
6461 case NFT_MSG_NEWOBJ:
6462 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6464 case NFT_MSG_NEWFLOWTABLE:
6465 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6471 static int __nf_tables_abort(struct net *net)
6473 struct nft_trans *trans, *next;
6474 struct nft_trans_elem *te;
6476 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
6478 switch (trans->msg_type) {
6479 case NFT_MSG_NEWTABLE:
6480 if (nft_trans_table_update(trans)) {
6481 if (nft_trans_table_enable(trans)) {
6482 nf_tables_table_disable(net,
6484 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6486 nft_trans_destroy(trans);
6488 list_del_rcu(&trans->ctx.table->list);
6491 case NFT_MSG_DELTABLE:
6492 nft_clear(trans->ctx.net, trans->ctx.table);
6493 nft_trans_destroy(trans);
6495 case NFT_MSG_NEWCHAIN:
6496 if (nft_trans_chain_update(trans)) {
6497 free_percpu(nft_trans_chain_stats(trans));
6499 nft_trans_destroy(trans);
6501 trans->ctx.table->use--;
6502 nft_chain_del(trans->ctx.chain);
6503 nf_tables_unregister_hook(trans->ctx.net,
6508 case NFT_MSG_DELCHAIN:
6509 trans->ctx.table->use++;
6510 nft_clear(trans->ctx.net, trans->ctx.chain);
6511 nft_trans_destroy(trans);
6513 case NFT_MSG_NEWRULE:
6514 trans->ctx.chain->use--;
6515 list_del_rcu(&nft_trans_rule(trans)->list);
6516 nft_rule_expr_deactivate(&trans->ctx, nft_trans_rule(trans));
6518 case NFT_MSG_DELRULE:
6519 trans->ctx.chain->use++;
6520 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6521 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
6522 nft_trans_destroy(trans);
6524 case NFT_MSG_NEWSET:
6525 trans->ctx.table->use--;
6526 list_del_rcu(&nft_trans_set(trans)->list);
6528 case NFT_MSG_DELSET:
6529 trans->ctx.table->use++;
6530 nft_clear(trans->ctx.net, nft_trans_set(trans));
6531 nft_trans_destroy(trans);
6533 case NFT_MSG_NEWSETELEM:
6534 te = (struct nft_trans_elem *)trans->data;
6536 te->set->ops->remove(net, te->set, &te->elem);
6537 atomic_dec(&te->set->nelems);
6539 case NFT_MSG_DELSETELEM:
6540 te = (struct nft_trans_elem *)trans->data;
6542 nft_set_elem_activate(net, te->set, &te->elem);
6543 te->set->ops->activate(net, te->set, &te->elem);
6546 nft_trans_destroy(trans);
6548 case NFT_MSG_NEWOBJ:
6549 trans->ctx.table->use--;
6550 list_del_rcu(&nft_trans_obj(trans)->list);
6552 case NFT_MSG_DELOBJ:
6553 trans->ctx.table->use++;
6554 nft_clear(trans->ctx.net, nft_trans_obj(trans));
6555 nft_trans_destroy(trans);
6557 case NFT_MSG_NEWFLOWTABLE:
6558 trans->ctx.table->use--;
6559 list_del_rcu(&nft_trans_flowtable(trans)->list);
6560 nft_unregister_flowtable_net_hooks(net,
6561 nft_trans_flowtable(trans));
6563 case NFT_MSG_DELFLOWTABLE:
6564 trans->ctx.table->use++;
6565 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
6566 nft_trans_destroy(trans);
6573 list_for_each_entry_safe_reverse(trans, next,
6574 &net->nft.commit_list, list) {
6575 list_del(&trans->list);
6576 nf_tables_abort_release(trans);
6582 static void nf_tables_cleanup(struct net *net)
6584 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
6587 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
6589 return __nf_tables_abort(net);
6592 static bool nf_tables_valid_genid(struct net *net, u32 genid)
6594 return net->nft.base_seq == genid;
6597 static const struct nfnetlink_subsystem nf_tables_subsys = {
6598 .name = "nf_tables",
6599 .subsys_id = NFNL_SUBSYS_NFTABLES,
6600 .cb_count = NFT_MSG_MAX,
6602 .commit = nf_tables_commit,
6603 .abort = nf_tables_abort,
6604 .cleanup = nf_tables_cleanup,
6605 .valid_genid = nf_tables_valid_genid,
6608 int nft_chain_validate_dependency(const struct nft_chain *chain,
6609 enum nft_chain_types type)
6611 const struct nft_base_chain *basechain;
6613 if (nft_is_base_chain(chain)) {
6614 basechain = nft_base_chain(chain);
6615 if (basechain->type->type != type)
6620 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
6622 int nft_chain_validate_hooks(const struct nft_chain *chain,
6623 unsigned int hook_flags)
6625 struct nft_base_chain *basechain;
6627 if (nft_is_base_chain(chain)) {
6628 basechain = nft_base_chain(chain);
6630 if ((1 << basechain->ops.hooknum) & hook_flags)
6638 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
6641 * Loop detection - walk through the ruleset beginning at the destination chain
6642 * of a new jump until either the source chain is reached (loop) or all
6643 * reachable chains have been traversed.
6645 * The loop check is performed whenever a new jump verdict is added to an
6646 * expression or verdict map or a verdict map is bound to a new chain.
6649 static int nf_tables_check_loops(const struct nft_ctx *ctx,
6650 const struct nft_chain *chain);
6652 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
6653 struct nft_set *set,
6654 const struct nft_set_iter *iter,
6655 struct nft_set_elem *elem)
6657 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6658 const struct nft_data *data;
6660 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6661 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
6664 data = nft_set_ext_data(ext);
6665 switch (data->verdict.code) {
6668 return nf_tables_check_loops(ctx, data->verdict.chain);
6674 static int nf_tables_check_loops(const struct nft_ctx *ctx,
6675 const struct nft_chain *chain)
6677 const struct nft_rule *rule;
6678 const struct nft_expr *expr, *last;
6679 struct nft_set *set;
6680 struct nft_set_binding *binding;
6681 struct nft_set_iter iter;
6683 if (ctx->chain == chain)
6686 list_for_each_entry(rule, &chain->rules, list) {
6687 nft_rule_for_each_expr(expr, last, rule) {
6688 struct nft_immediate_expr *priv;
6689 const struct nft_data *data;
6692 if (strcmp(expr->ops->type->name, "immediate"))
6695 priv = nft_expr_priv(expr);
6696 if (priv->dreg != NFT_REG_VERDICT)
6700 switch (data->verdict.code) {
6703 err = nf_tables_check_loops(ctx,
6704 data->verdict.chain);
6713 list_for_each_entry(set, &ctx->table->sets, list) {
6714 if (!nft_is_active_next(ctx->net, set))
6716 if (!(set->flags & NFT_SET_MAP) ||
6717 set->dtype != NFT_DATA_VERDICT)
6720 list_for_each_entry(binding, &set->bindings, list) {
6721 if (!(binding->flags & NFT_SET_MAP) ||
6722 binding->chain != chain)
6725 iter.genmask = nft_genmask_next(ctx->net);
6729 iter.fn = nf_tables_loop_check_setelem;
6731 set->ops->walk(ctx, set, &iter);
6741 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
6743 * @attr: netlink attribute to fetch value from
6744 * @max: maximum value to be stored in dest
6745 * @dest: pointer to the variable
6747 * Parse, check and store a given u32 netlink attribute into variable.
6748 * This function returns -ERANGE if the value goes over maximum value.
6749 * Otherwise a 0 is returned and the attribute value is stored in the
6750 * destination variable.
6752 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
6756 val = ntohl(nla_get_be32(attr));
6763 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
6766 * nft_parse_register - parse a register value from a netlink attribute
6768 * @attr: netlink attribute
6770 * Parse and translate a register value from a netlink attribute.
6771 * Registers used to be 128 bit wide, these register numbers will be
6772 * mapped to the corresponding 32 bit register numbers.
6774 unsigned int nft_parse_register(const struct nlattr *attr)
6778 reg = ntohl(nla_get_be32(attr));
6780 case NFT_REG_VERDICT...NFT_REG_4:
6781 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
6783 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
6786 EXPORT_SYMBOL_GPL(nft_parse_register);
6789 * nft_dump_register - dump a register value to a netlink attribute
6791 * @skb: socket buffer
6792 * @attr: attribute number
6793 * @reg: register number
6795 * Construct a netlink attribute containing the register number. For
6796 * compatibility reasons, register numbers being a multiple of 4 are
6797 * translated to the corresponding 128 bit register numbers.
6799 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
6801 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
6802 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
6804 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
6806 return nla_put_be32(skb, attr, htonl(reg));
6808 EXPORT_SYMBOL_GPL(nft_dump_register);
6811 * nft_validate_register_load - validate a load from a register
6813 * @reg: the register number
6814 * @len: the length of the data
6816 * Validate that the input register is one of the general purpose
6817 * registers and that the length of the load is within the bounds.
6819 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
6821 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
6825 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
6830 EXPORT_SYMBOL_GPL(nft_validate_register_load);
6833 * nft_validate_register_store - validate an expressions' register store
6835 * @ctx: context of the expression performing the load
6836 * @reg: the destination register number
6837 * @data: the data to load
6838 * @type: the data type
6839 * @len: the length of the data
6841 * Validate that a data load uses the appropriate data type for
6842 * the destination register and the length is within the bounds.
6843 * A value of NULL for the data means that its runtime gathered
6846 int nft_validate_register_store(const struct nft_ctx *ctx,
6847 enum nft_registers reg,
6848 const struct nft_data *data,
6849 enum nft_data_types type, unsigned int len)
6854 case NFT_REG_VERDICT:
6855 if (type != NFT_DATA_VERDICT)
6859 (data->verdict.code == NFT_GOTO ||
6860 data->verdict.code == NFT_JUMP)) {
6861 err = nf_tables_check_loops(ctx, data->verdict.chain);
6865 if (ctx->chain->level + 1 >
6866 data->verdict.chain->level) {
6867 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
6869 data->verdict.chain->level = ctx->chain->level + 1;
6875 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
6879 if (reg * NFT_REG32_SIZE + len >
6880 FIELD_SIZEOF(struct nft_regs, data))
6883 if (data != NULL && type != NFT_DATA_VALUE)
6888 EXPORT_SYMBOL_GPL(nft_validate_register_store);
6890 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
6891 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
6892 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
6893 .len = NFT_CHAIN_MAXNAMELEN - 1 },
6896 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
6897 struct nft_data_desc *desc, const struct nlattr *nla)
6899 u8 genmask = nft_genmask_next(ctx->net);
6900 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
6901 struct nft_chain *chain;
6904 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
6909 if (!tb[NFTA_VERDICT_CODE])
6911 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
6913 switch (data->verdict.code) {
6915 switch (data->verdict.code & NF_VERDICT_MASK) {
6930 if (!tb[NFTA_VERDICT_CHAIN])
6932 chain = nft_chain_lookup(ctx->table, tb[NFTA_VERDICT_CHAIN],
6935 return PTR_ERR(chain);
6936 if (nft_is_base_chain(chain))
6940 data->verdict.chain = chain;
6944 desc->len = sizeof(data->verdict);
6945 desc->type = NFT_DATA_VERDICT;
6949 static void nft_verdict_uninit(const struct nft_data *data)
6951 switch (data->verdict.code) {
6954 data->verdict.chain->use--;
6959 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
6961 struct nlattr *nest;
6963 nest = nla_nest_start(skb, type);
6965 goto nla_put_failure;
6967 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
6968 goto nla_put_failure;
6973 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
6975 goto nla_put_failure;
6977 nla_nest_end(skb, nest);
6984 static int nft_value_init(const struct nft_ctx *ctx,
6985 struct nft_data *data, unsigned int size,
6986 struct nft_data_desc *desc, const struct nlattr *nla)
6996 nla_memcpy(data->data, nla, len);
6997 desc->type = NFT_DATA_VALUE;
7002 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
7005 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
7008 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
7009 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
7010 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
7014 * nft_data_init - parse nf_tables data netlink attributes
7016 * @ctx: context of the expression using the data
7017 * @data: destination struct nft_data
7018 * @size: maximum data length
7019 * @desc: data description
7020 * @nla: netlink attribute containing data
7022 * Parse the netlink data attributes and initialize a struct nft_data.
7023 * The type and length of data are returned in the data description.
7025 * The caller can indicate that it only wants to accept data of type
7026 * NFT_DATA_VALUE by passing NULL for the ctx argument.
7028 int nft_data_init(const struct nft_ctx *ctx,
7029 struct nft_data *data, unsigned int size,
7030 struct nft_data_desc *desc, const struct nlattr *nla)
7032 struct nlattr *tb[NFTA_DATA_MAX + 1];
7035 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
7039 if (tb[NFTA_DATA_VALUE])
7040 return nft_value_init(ctx, data, size, desc,
7041 tb[NFTA_DATA_VALUE]);
7042 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
7043 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
7046 EXPORT_SYMBOL_GPL(nft_data_init);
7049 * nft_data_release - release a nft_data item
7051 * @data: struct nft_data to release
7052 * @type: type of data
7054 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7055 * all others need to be released by calling this function.
7057 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
7059 if (type < NFT_DATA_VERDICT)
7062 case NFT_DATA_VERDICT:
7063 return nft_verdict_uninit(data);
7068 EXPORT_SYMBOL_GPL(nft_data_release);
7070 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
7071 enum nft_data_types type, unsigned int len)
7073 struct nlattr *nest;
7076 nest = nla_nest_start(skb, attr);
7081 case NFT_DATA_VALUE:
7082 err = nft_value_dump(skb, data, len);
7084 case NFT_DATA_VERDICT:
7085 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
7092 nla_nest_end(skb, nest);
7095 EXPORT_SYMBOL_GPL(nft_data_dump);
7097 int __nft_release_basechain(struct nft_ctx *ctx)
7099 struct nft_rule *rule, *nr;
7101 BUG_ON(!nft_is_base_chain(ctx->chain));
7103 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
7104 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
7105 list_del(&rule->list);
7107 nf_tables_rule_release(ctx, rule);
7109 nft_chain_del(ctx->chain);
7111 nf_tables_chain_destroy(ctx);
7115 EXPORT_SYMBOL_GPL(__nft_release_basechain);
7117 static void __nft_release_tables(struct net *net)
7119 struct nft_flowtable *flowtable, *nf;
7120 struct nft_table *table, *nt;
7121 struct nft_chain *chain, *nc;
7122 struct nft_object *obj, *ne;
7123 struct nft_rule *rule, *nr;
7124 struct nft_set *set, *ns;
7125 struct nft_ctx ctx = {
7127 .family = NFPROTO_NETDEV,
7130 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
7131 ctx.family = table->family;
7133 list_for_each_entry(chain, &table->chains, list)
7134 nf_tables_unregister_hook(net, table, chain);
7135 list_for_each_entry(flowtable, &table->flowtables, list)
7136 nf_unregister_net_hooks(net, flowtable->ops,
7137 flowtable->ops_len);
7138 /* No packets are walking on these chains anymore. */
7140 list_for_each_entry(chain, &table->chains, list) {
7142 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
7143 list_del(&rule->list);
7145 nf_tables_rule_release(&ctx, rule);
7148 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
7149 list_del(&flowtable->list);
7151 nf_tables_flowtable_destroy(flowtable);
7153 list_for_each_entry_safe(set, ns, &table->sets, list) {
7154 list_del(&set->list);
7156 nft_set_destroy(set);
7158 list_for_each_entry_safe(obj, ne, &table->objects, list) {
7159 list_del(&obj->list);
7161 nft_obj_destroy(&ctx, obj);
7163 list_for_each_entry_safe(chain, nc, &table->chains, list) {
7165 nft_chain_del(chain);
7167 nf_tables_chain_destroy(&ctx);
7169 list_del(&table->list);
7170 nf_tables_table_destroy(&ctx);
7174 static int __net_init nf_tables_init_net(struct net *net)
7176 INIT_LIST_HEAD(&net->nft.tables);
7177 INIT_LIST_HEAD(&net->nft.commit_list);
7178 net->nft.base_seq = 1;
7179 net->nft.validate_state = NFT_VALIDATE_SKIP;
7184 static void __net_exit nf_tables_exit_net(struct net *net)
7186 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7187 if (!list_empty(&net->nft.commit_list))
7188 __nf_tables_abort(net);
7189 __nft_release_tables(net);
7190 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7191 WARN_ON_ONCE(!list_empty(&net->nft.tables));
7194 static struct pernet_operations nf_tables_net_ops = {
7195 .init = nf_tables_init_net,
7196 .exit = nf_tables_exit_net,
7199 static int __init nf_tables_module_init(void)
7203 nft_chain_filter_init();
7205 info = kmalloc_array(NFT_RULE_MAXEXPRS, sizeof(struct nft_expr_info),
7212 err = nf_tables_core_module_init();
7216 err = nfnetlink_subsys_register(&nf_tables_subsys);
7220 register_netdevice_notifier(&nf_tables_flowtable_notifier);
7222 return register_pernet_subsys(&nf_tables_net_ops);
7224 nf_tables_core_module_exit();
7231 static void __exit nf_tables_module_exit(void)
7233 nfnetlink_subsys_unregister(&nf_tables_subsys);
7234 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7235 nft_chain_filter_fini();
7236 unregister_pernet_subsys(&nf_tables_net_ops);
7238 nf_tables_core_module_exit();
7242 module_init(nf_tables_module_init);
7243 module_exit(nf_tables_module_exit);
7245 MODULE_LICENSE("GPL");
7246 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
7247 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);