1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
5 * Development of this code funded by Astaro AG (http://www.astaro.com/)
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/list.h>
11 #include <linux/skbuff.h>
12 #include <linux/netlink.h>
13 #include <linux/vmalloc.h>
14 #include <linux/rhashtable.h>
15 #include <linux/netfilter.h>
16 #include <linux/netfilter/nfnetlink.h>
17 #include <linux/netfilter/nf_tables.h>
18 #include <net/netfilter/nf_flow_table.h>
19 #include <net/netfilter/nf_tables_core.h>
20 #include <net/netfilter/nf_tables.h>
21 #include <net/netfilter/nf_tables_offload.h>
22 #include <net/net_namespace.h>
25 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
27 static LIST_HEAD(nf_tables_expressions);
28 static LIST_HEAD(nf_tables_objects);
29 static LIST_HEAD(nf_tables_flowtables);
30 static LIST_HEAD(nf_tables_destroy_list);
31 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
32 static u64 table_handle;
35 NFT_VALIDATE_SKIP = 0,
40 static struct rhltable nft_objname_ht;
42 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
43 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
44 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
46 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
47 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
48 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
50 static const struct rhashtable_params nft_chain_ht_params = {
51 .head_offset = offsetof(struct nft_chain, rhlhead),
52 .key_offset = offsetof(struct nft_chain, name),
53 .hashfn = nft_chain_hash,
54 .obj_hashfn = nft_chain_hash_obj,
55 .obj_cmpfn = nft_chain_hash_cmp,
56 .automatic_shrinking = true,
59 static const struct rhashtable_params nft_objname_ht_params = {
60 .head_offset = offsetof(struct nft_object, rhlhead),
61 .key_offset = offsetof(struct nft_object, key),
62 .hashfn = nft_objname_hash,
63 .obj_hashfn = nft_objname_hash_obj,
64 .obj_cmpfn = nft_objname_hash_cmp,
65 .automatic_shrinking = true,
68 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
70 switch (net->nft.validate_state) {
71 case NFT_VALIDATE_SKIP:
72 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
74 case NFT_VALIDATE_NEED:
77 if (new_validate_state == NFT_VALIDATE_NEED)
81 net->nft.validate_state = new_validate_state;
83 static void nf_tables_trans_destroy_work(struct work_struct *w);
84 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
86 static void nft_ctx_init(struct nft_ctx *ctx,
88 const struct sk_buff *skb,
89 const struct nlmsghdr *nlh,
91 struct nft_table *table,
92 struct nft_chain *chain,
93 const struct nlattr * const *nla)
101 ctx->portid = NETLINK_CB(skb).portid;
102 ctx->report = nlmsg_report(nlh);
103 ctx->flags = nlh->nlmsg_flags;
104 ctx->seq = nlh->nlmsg_seq;
107 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
108 int msg_type, u32 size, gfp_t gfp)
110 struct nft_trans *trans;
112 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
116 trans->msg_type = msg_type;
122 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
123 int msg_type, u32 size)
125 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
128 static void nft_trans_destroy(struct nft_trans *trans)
130 list_del(&trans->list);
134 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
136 struct net *net = ctx->net;
137 struct nft_trans *trans;
139 if (!nft_set_is_anonymous(set))
142 list_for_each_entry_reverse(trans, &net->nft.commit_list, list) {
143 switch (trans->msg_type) {
145 if (nft_trans_set(trans) == set)
146 nft_trans_set_bound(trans) = true;
148 case NFT_MSG_NEWSETELEM:
149 if (nft_trans_elem_set(trans) == set)
150 nft_trans_elem_set_bound(trans) = true;
156 static int nft_netdev_register_hooks(struct net *net,
157 struct list_head *hook_list)
159 struct nft_hook *hook;
163 list_for_each_entry(hook, hook_list, list) {
164 err = nf_register_net_hook(net, &hook->ops);
173 list_for_each_entry(hook, hook_list, list) {
177 nf_unregister_net_hook(net, &hook->ops);
182 static void nft_netdev_unregister_hooks(struct net *net,
183 struct list_head *hook_list)
185 struct nft_hook *hook;
187 list_for_each_entry(hook, hook_list, list)
188 nf_unregister_net_hook(net, &hook->ops);
191 static int nft_register_basechain_hooks(struct net *net, int family,
192 struct nft_base_chain *basechain)
194 if (family == NFPROTO_NETDEV)
195 return nft_netdev_register_hooks(net, &basechain->hook_list);
197 return nf_register_net_hook(net, &basechain->ops);
200 static void nft_unregister_basechain_hooks(struct net *net, int family,
201 struct nft_base_chain *basechain)
203 if (family == NFPROTO_NETDEV)
204 nft_netdev_unregister_hooks(net, &basechain->hook_list);
206 nf_unregister_net_hook(net, &basechain->ops);
209 static int nf_tables_register_hook(struct net *net,
210 const struct nft_table *table,
211 struct nft_chain *chain)
213 struct nft_base_chain *basechain;
214 const struct nf_hook_ops *ops;
216 if (table->flags & NFT_TABLE_F_DORMANT ||
217 !nft_is_base_chain(chain))
220 basechain = nft_base_chain(chain);
221 ops = &basechain->ops;
223 if (basechain->type->ops_register)
224 return basechain->type->ops_register(net, ops);
226 return nft_register_basechain_hooks(net, table->family, basechain);
229 static void nf_tables_unregister_hook(struct net *net,
230 const struct nft_table *table,
231 struct nft_chain *chain)
233 struct nft_base_chain *basechain;
234 const struct nf_hook_ops *ops;
236 if (table->flags & NFT_TABLE_F_DORMANT ||
237 !nft_is_base_chain(chain))
239 basechain = nft_base_chain(chain);
240 ops = &basechain->ops;
242 if (basechain->type->ops_unregister)
243 return basechain->type->ops_unregister(net, ops);
245 nft_unregister_basechain_hooks(net, table->family, basechain);
248 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
250 struct nft_trans *trans;
252 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
256 if (msg_type == NFT_MSG_NEWTABLE)
257 nft_activate_next(ctx->net, ctx->table);
259 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
263 static int nft_deltable(struct nft_ctx *ctx)
267 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
271 nft_deactivate_next(ctx->net, ctx->table);
275 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
277 struct nft_trans *trans;
279 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
281 return ERR_PTR(-ENOMEM);
283 if (msg_type == NFT_MSG_NEWCHAIN)
284 nft_activate_next(ctx->net, ctx->chain);
286 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
290 static int nft_delchain(struct nft_ctx *ctx)
292 struct nft_trans *trans;
294 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
296 return PTR_ERR(trans);
299 nft_deactivate_next(ctx->net, ctx->chain);
304 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
305 struct nft_rule *rule)
307 struct nft_expr *expr;
309 expr = nft_expr_first(rule);
310 while (expr != nft_expr_last(rule) && expr->ops) {
311 if (expr->ops->activate)
312 expr->ops->activate(ctx, expr);
314 expr = nft_expr_next(expr);
318 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
319 struct nft_rule *rule,
320 enum nft_trans_phase phase)
322 struct nft_expr *expr;
324 expr = nft_expr_first(rule);
325 while (expr != nft_expr_last(rule) && expr->ops) {
326 if (expr->ops->deactivate)
327 expr->ops->deactivate(ctx, expr, phase);
329 expr = nft_expr_next(expr);
334 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
336 /* You cannot delete the same rule twice */
337 if (nft_is_active_next(ctx->net, rule)) {
338 nft_deactivate_next(ctx->net, rule);
345 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
346 struct nft_rule *rule)
348 struct nft_trans *trans;
350 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
354 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
355 nft_trans_rule_id(trans) =
356 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
358 nft_trans_rule(trans) = rule;
359 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
364 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
366 struct nft_flow_rule *flow;
367 struct nft_trans *trans;
370 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
374 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
375 flow = nft_flow_rule_create(ctx->net, rule);
377 nft_trans_destroy(trans);
378 return PTR_ERR(flow);
381 nft_trans_flow_rule(trans) = flow;
384 err = nf_tables_delrule_deactivate(ctx, rule);
386 nft_trans_destroy(trans);
389 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
394 static int nft_delrule_by_chain(struct nft_ctx *ctx)
396 struct nft_rule *rule;
399 list_for_each_entry(rule, &ctx->chain->rules, list) {
400 if (!nft_is_active_next(ctx->net, rule))
403 err = nft_delrule(ctx, rule);
410 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
413 struct nft_trans *trans;
415 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
419 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
420 nft_trans_set_id(trans) =
421 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
422 nft_activate_next(ctx->net, set);
424 nft_trans_set(trans) = set;
425 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
430 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
434 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
438 nft_deactivate_next(ctx->net, set);
444 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
445 struct nft_object *obj)
447 struct nft_trans *trans;
449 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
453 if (msg_type == NFT_MSG_NEWOBJ)
454 nft_activate_next(ctx->net, obj);
456 nft_trans_obj(trans) = obj;
457 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
462 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
466 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
470 nft_deactivate_next(ctx->net, obj);
476 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
477 struct nft_flowtable *flowtable)
479 struct nft_trans *trans;
481 trans = nft_trans_alloc(ctx, msg_type,
482 sizeof(struct nft_trans_flowtable));
486 if (msg_type == NFT_MSG_NEWFLOWTABLE)
487 nft_activate_next(ctx->net, flowtable);
489 nft_trans_flowtable(trans) = flowtable;
490 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
495 static int nft_delflowtable(struct nft_ctx *ctx,
496 struct nft_flowtable *flowtable)
500 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
504 nft_deactivate_next(ctx->net, flowtable);
514 static struct nft_table *nft_table_lookup(const struct net *net,
515 const struct nlattr *nla,
516 u8 family, u8 genmask)
518 struct nft_table *table;
521 return ERR_PTR(-EINVAL);
523 list_for_each_entry_rcu(table, &net->nft.tables, list) {
524 if (!nla_strcmp(nla, table->name) &&
525 table->family == family &&
526 nft_active_genmask(table, genmask))
530 return ERR_PTR(-ENOENT);
533 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
534 const struct nlattr *nla,
537 struct nft_table *table;
539 list_for_each_entry(table, &net->nft.tables, list) {
540 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
541 nft_active_genmask(table, genmask))
545 return ERR_PTR(-ENOENT);
548 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
550 return ++table->hgenerator;
553 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
555 static const struct nft_chain_type *
556 __nft_chain_type_get(u8 family, enum nft_chain_types type)
558 if (family >= NFPROTO_NUMPROTO ||
559 type >= NFT_CHAIN_T_MAX)
562 return chain_type[family][type];
565 static const struct nft_chain_type *
566 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
568 const struct nft_chain_type *type;
571 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
572 type = __nft_chain_type_get(family, i);
575 if (!nla_strcmp(nla, type->name))
581 struct nft_module_request {
582 struct list_head list;
583 char module[MODULE_NAME_LEN];
587 #ifdef CONFIG_MODULES
588 static int nft_request_module(struct net *net, const char *fmt, ...)
590 char module_name[MODULE_NAME_LEN];
591 struct nft_module_request *req;
596 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
598 if (ret >= MODULE_NAME_LEN)
601 list_for_each_entry(req, &net->nft.module_list, list) {
602 if (!strcmp(req->module, module_name)) {
606 /* A request to load this module already exists. */
611 req = kmalloc(sizeof(*req), GFP_KERNEL);
616 strlcpy(req->module, module_name, MODULE_NAME_LEN);
617 list_add_tail(&req->list, &net->nft.module_list);
623 static void lockdep_nfnl_nft_mutex_not_held(void)
625 #ifdef CONFIG_PROVE_LOCKING
626 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
630 static const struct nft_chain_type *
631 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
632 u8 family, bool autoload)
634 const struct nft_chain_type *type;
636 type = __nf_tables_chain_type_lookup(nla, family);
640 lockdep_nfnl_nft_mutex_not_held();
641 #ifdef CONFIG_MODULES
643 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
645 (const char *)nla_data(nla)) == -EAGAIN)
646 return ERR_PTR(-EAGAIN);
649 return ERR_PTR(-ENOENT);
652 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
653 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
654 .len = NFT_TABLE_MAXNAMELEN - 1 },
655 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
656 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
659 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
660 u32 portid, u32 seq, int event, u32 flags,
661 int family, const struct nft_table *table)
663 struct nlmsghdr *nlh;
664 struct nfgenmsg *nfmsg;
666 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
667 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
669 goto nla_put_failure;
671 nfmsg = nlmsg_data(nlh);
672 nfmsg->nfgen_family = family;
673 nfmsg->version = NFNETLINK_V0;
674 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
676 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
677 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
678 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
679 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
681 goto nla_put_failure;
687 nlmsg_trim(skb, nlh);
691 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
697 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
700 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
704 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
705 event, 0, ctx->family, ctx->table);
711 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
712 ctx->report, GFP_KERNEL);
715 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
718 static int nf_tables_dump_tables(struct sk_buff *skb,
719 struct netlink_callback *cb)
721 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
722 const struct nft_table *table;
723 unsigned int idx = 0, s_idx = cb->args[0];
724 struct net *net = sock_net(skb->sk);
725 int family = nfmsg->nfgen_family;
728 cb->seq = net->nft.base_seq;
730 list_for_each_entry_rcu(table, &net->nft.tables, list) {
731 if (family != NFPROTO_UNSPEC && family != table->family)
737 memset(&cb->args[1], 0,
738 sizeof(cb->args) - sizeof(cb->args[0]));
739 if (!nft_is_active(net, table))
741 if (nf_tables_fill_table_info(skb, net,
742 NETLINK_CB(cb->skb).portid,
744 NFT_MSG_NEWTABLE, NLM_F_MULTI,
745 table->family, table) < 0)
748 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
758 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
759 const struct nlmsghdr *nlh,
760 struct netlink_dump_control *c)
764 if (!try_module_get(THIS_MODULE))
768 err = netlink_dump_start(nlsk, skb, nlh, c);
770 module_put(THIS_MODULE);
775 /* called with rcu_read_lock held */
776 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
777 struct sk_buff *skb, const struct nlmsghdr *nlh,
778 const struct nlattr * const nla[],
779 struct netlink_ext_ack *extack)
781 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
782 u8 genmask = nft_genmask_cur(net);
783 const struct nft_table *table;
784 struct sk_buff *skb2;
785 int family = nfmsg->nfgen_family;
788 if (nlh->nlmsg_flags & NLM_F_DUMP) {
789 struct netlink_dump_control c = {
790 .dump = nf_tables_dump_tables,
791 .module = THIS_MODULE,
794 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
797 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
799 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
800 return PTR_ERR(table);
803 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
807 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
808 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
813 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
820 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
822 struct nft_chain *chain;
825 list_for_each_entry(chain, &table->chains, list) {
826 if (!nft_is_active_next(net, chain))
828 if (!nft_is_base_chain(chain))
831 if (cnt && i++ == cnt)
834 nft_unregister_basechain_hooks(net, table->family,
835 nft_base_chain(chain));
839 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
841 struct nft_chain *chain;
844 list_for_each_entry(chain, &table->chains, list) {
845 if (!nft_is_active_next(net, chain))
847 if (!nft_is_base_chain(chain))
850 err = nft_register_basechain_hooks(net, table->family,
851 nft_base_chain(chain));
853 goto err_register_hooks;
861 nft_table_disable(net, table, i);
865 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
867 nft_table_disable(net, table, 0);
870 static int nf_tables_updtable(struct nft_ctx *ctx)
872 struct nft_trans *trans;
876 if (!ctx->nla[NFTA_TABLE_FLAGS])
879 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
880 if (flags & ~NFT_TABLE_F_DORMANT)
883 if (flags == ctx->table->flags)
886 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
887 sizeof(struct nft_trans_table));
891 if ((flags & NFT_TABLE_F_DORMANT) &&
892 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
893 nft_trans_table_enable(trans) = false;
894 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
895 ctx->table->flags & NFT_TABLE_F_DORMANT) {
896 ret = nf_tables_table_enable(ctx->net, ctx->table);
898 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
899 nft_trans_table_enable(trans) = true;
905 nft_trans_table_update(trans) = true;
906 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
909 nft_trans_destroy(trans);
913 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
915 const char *name = data;
917 return jhash(name, strlen(name), seed);
920 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
922 const struct nft_chain *chain = data;
924 return nft_chain_hash(chain->name, 0, seed);
927 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
930 const struct nft_chain *chain = ptr;
931 const char *name = arg->key;
933 return strcmp(chain->name, name);
936 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
938 const struct nft_object_hash_key *k = data;
940 seed ^= hash_ptr(k->table, 32);
942 return jhash(k->name, strlen(k->name), seed);
945 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
947 const struct nft_object *obj = data;
949 return nft_objname_hash(&obj->key, 0, seed);
952 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
955 const struct nft_object_hash_key *k = arg->key;
956 const struct nft_object *obj = ptr;
958 if (obj->key.table != k->table)
961 return strcmp(obj->key.name, k->name);
964 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
965 struct sk_buff *skb, const struct nlmsghdr *nlh,
966 const struct nlattr * const nla[],
967 struct netlink_ext_ack *extack)
969 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
970 u8 genmask = nft_genmask_next(net);
971 int family = nfmsg->nfgen_family;
972 const struct nlattr *attr;
973 struct nft_table *table;
978 lockdep_assert_held(&net->nft.commit_mutex);
979 attr = nla[NFTA_TABLE_NAME];
980 table = nft_table_lookup(net, attr, family, genmask);
982 if (PTR_ERR(table) != -ENOENT)
983 return PTR_ERR(table);
985 if (nlh->nlmsg_flags & NLM_F_EXCL) {
986 NL_SET_BAD_ATTR(extack, attr);
989 if (nlh->nlmsg_flags & NLM_F_REPLACE)
992 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
993 return nf_tables_updtable(&ctx);
996 if (nla[NFTA_TABLE_FLAGS]) {
997 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
998 if (flags & ~NFT_TABLE_F_DORMANT)
1003 table = kzalloc(sizeof(*table), GFP_KERNEL);
1007 table->name = nla_strdup(attr, GFP_KERNEL);
1008 if (table->name == NULL)
1011 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1015 INIT_LIST_HEAD(&table->chains);
1016 INIT_LIST_HEAD(&table->sets);
1017 INIT_LIST_HEAD(&table->objects);
1018 INIT_LIST_HEAD(&table->flowtables);
1019 table->family = family;
1020 table->flags = flags;
1021 table->handle = ++table_handle;
1023 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1024 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1028 list_add_tail_rcu(&table->list, &net->nft.tables);
1031 rhltable_destroy(&table->chains_ht);
1040 static int nft_flush_table(struct nft_ctx *ctx)
1042 struct nft_flowtable *flowtable, *nft;
1043 struct nft_chain *chain, *nc;
1044 struct nft_object *obj, *ne;
1045 struct nft_set *set, *ns;
1048 list_for_each_entry(chain, &ctx->table->chains, list) {
1049 if (!nft_is_active_next(ctx->net, chain))
1054 err = nft_delrule_by_chain(ctx);
1059 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1060 if (!nft_is_active_next(ctx->net, set))
1063 if (nft_set_is_anonymous(set) &&
1064 !list_empty(&set->bindings))
1067 err = nft_delset(ctx, set);
1072 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1073 if (!nft_is_active_next(ctx->net, flowtable))
1076 err = nft_delflowtable(ctx, flowtable);
1081 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1082 if (!nft_is_active_next(ctx->net, obj))
1085 err = nft_delobj(ctx, obj);
1090 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1091 if (!nft_is_active_next(ctx->net, chain))
1096 err = nft_delchain(ctx);
1101 err = nft_deltable(ctx);
1106 static int nft_flush(struct nft_ctx *ctx, int family)
1108 struct nft_table *table, *nt;
1109 const struct nlattr * const *nla = ctx->nla;
1112 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
1113 if (family != AF_UNSPEC && table->family != family)
1116 ctx->family = table->family;
1118 if (!nft_is_active_next(ctx->net, table))
1121 if (nla[NFTA_TABLE_NAME] &&
1122 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1127 err = nft_flush_table(ctx);
1135 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1136 struct sk_buff *skb, const struct nlmsghdr *nlh,
1137 const struct nlattr * const nla[],
1138 struct netlink_ext_ack *extack)
1140 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1141 u8 genmask = nft_genmask_next(net);
1142 int family = nfmsg->nfgen_family;
1143 const struct nlattr *attr;
1144 struct nft_table *table;
1147 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
1148 if (family == AF_UNSPEC ||
1149 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1150 return nft_flush(&ctx, family);
1152 if (nla[NFTA_TABLE_HANDLE]) {
1153 attr = nla[NFTA_TABLE_HANDLE];
1154 table = nft_table_lookup_byhandle(net, attr, genmask);
1156 attr = nla[NFTA_TABLE_NAME];
1157 table = nft_table_lookup(net, attr, family, genmask);
1160 if (IS_ERR(table)) {
1161 NL_SET_BAD_ATTR(extack, attr);
1162 return PTR_ERR(table);
1165 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1169 ctx.family = family;
1172 return nft_flush_table(&ctx);
1175 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1177 if (WARN_ON(ctx->table->use > 0))
1180 rhltable_destroy(&ctx->table->chains_ht);
1181 kfree(ctx->table->name);
1185 void nft_register_chain_type(const struct nft_chain_type *ctype)
1187 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1188 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1189 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1192 chain_type[ctype->family][ctype->type] = ctype;
1193 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1195 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1197 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1199 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1200 chain_type[ctype->family][ctype->type] = NULL;
1201 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1203 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1209 static struct nft_chain *
1210 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1212 struct nft_chain *chain;
1214 list_for_each_entry(chain, &table->chains, list) {
1215 if (chain->handle == handle &&
1216 nft_active_genmask(chain, genmask))
1220 return ERR_PTR(-ENOENT);
1223 static bool lockdep_commit_lock_is_held(const struct net *net)
1225 #ifdef CONFIG_PROVE_LOCKING
1226 return lockdep_is_held(&net->nft.commit_mutex);
1232 static struct nft_chain *nft_chain_lookup(struct net *net,
1233 struct nft_table *table,
1234 const struct nlattr *nla, u8 genmask)
1236 char search[NFT_CHAIN_MAXNAMELEN + 1];
1237 struct rhlist_head *tmp, *list;
1238 struct nft_chain *chain;
1241 return ERR_PTR(-EINVAL);
1243 nla_strlcpy(search, nla, sizeof(search));
1245 WARN_ON(!rcu_read_lock_held() &&
1246 !lockdep_commit_lock_is_held(net));
1248 chain = ERR_PTR(-ENOENT);
1250 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1254 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1255 if (nft_active_genmask(chain, genmask))
1258 chain = ERR_PTR(-ENOENT);
1264 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1265 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1266 .len = NFT_TABLE_MAXNAMELEN - 1 },
1267 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1268 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1269 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1270 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1271 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1272 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1273 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1274 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1275 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1278 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1279 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1280 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1281 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1282 .len = IFNAMSIZ - 1 },
1285 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1287 struct nft_stats *cpu_stats, total;
1288 struct nlattr *nest;
1296 memset(&total, 0, sizeof(total));
1297 for_each_possible_cpu(cpu) {
1298 cpu_stats = per_cpu_ptr(stats, cpu);
1300 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1301 pkts = cpu_stats->pkts;
1302 bytes = cpu_stats->bytes;
1303 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1305 total.bytes += bytes;
1307 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1309 goto nla_put_failure;
1311 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1312 NFTA_COUNTER_PAD) ||
1313 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1315 goto nla_put_failure;
1317 nla_nest_end(skb, nest);
1324 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1325 const struct nft_base_chain *basechain)
1327 const struct nf_hook_ops *ops = &basechain->ops;
1328 struct nft_hook *hook, *first = NULL;
1329 struct nlattr *nest, *nest_devs;
1332 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1334 goto nla_put_failure;
1335 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1336 goto nla_put_failure;
1337 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1338 goto nla_put_failure;
1340 if (family == NFPROTO_NETDEV) {
1341 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1342 list_for_each_entry(hook, &basechain->hook_list, list) {
1346 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1347 hook->ops.dev->name))
1348 goto nla_put_failure;
1351 nla_nest_end(skb, nest_devs);
1354 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1355 goto nla_put_failure;
1357 nla_nest_end(skb, nest);
1364 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1365 u32 portid, u32 seq, int event, u32 flags,
1366 int family, const struct nft_table *table,
1367 const struct nft_chain *chain)
1369 struct nlmsghdr *nlh;
1370 struct nfgenmsg *nfmsg;
1372 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1373 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1375 goto nla_put_failure;
1377 nfmsg = nlmsg_data(nlh);
1378 nfmsg->nfgen_family = family;
1379 nfmsg->version = NFNETLINK_V0;
1380 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1382 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1383 goto nla_put_failure;
1384 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1386 goto nla_put_failure;
1387 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1388 goto nla_put_failure;
1390 if (nft_is_base_chain(chain)) {
1391 const struct nft_base_chain *basechain = nft_base_chain(chain);
1392 struct nft_stats __percpu *stats;
1394 if (nft_dump_basechain_hook(skb, family, basechain))
1395 goto nla_put_failure;
1397 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1398 htonl(basechain->policy)))
1399 goto nla_put_failure;
1401 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1402 goto nla_put_failure;
1404 stats = rcu_dereference_check(basechain->stats,
1405 lockdep_commit_lock_is_held(net));
1406 if (nft_dump_stats(skb, stats))
1407 goto nla_put_failure;
1409 if ((chain->flags & NFT_CHAIN_HW_OFFLOAD) &&
1410 nla_put_be32(skb, NFTA_CHAIN_FLAGS,
1411 htonl(NFT_CHAIN_HW_OFFLOAD)))
1412 goto nla_put_failure;
1415 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1416 goto nla_put_failure;
1418 nlmsg_end(skb, nlh);
1422 nlmsg_trim(skb, nlh);
1426 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1428 struct sk_buff *skb;
1432 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1435 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1439 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1440 event, 0, ctx->family, ctx->table,
1447 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1448 ctx->report, GFP_KERNEL);
1451 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1454 static int nf_tables_dump_chains(struct sk_buff *skb,
1455 struct netlink_callback *cb)
1457 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1458 const struct nft_table *table;
1459 const struct nft_chain *chain;
1460 unsigned int idx = 0, s_idx = cb->args[0];
1461 struct net *net = sock_net(skb->sk);
1462 int family = nfmsg->nfgen_family;
1465 cb->seq = net->nft.base_seq;
1467 list_for_each_entry_rcu(table, &net->nft.tables, list) {
1468 if (family != NFPROTO_UNSPEC && family != table->family)
1471 list_for_each_entry_rcu(chain, &table->chains, list) {
1475 memset(&cb->args[1], 0,
1476 sizeof(cb->args) - sizeof(cb->args[0]));
1477 if (!nft_is_active(net, chain))
1479 if (nf_tables_fill_chain_info(skb, net,
1480 NETLINK_CB(cb->skb).portid,
1484 table->family, table,
1488 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1499 /* called with rcu_read_lock held */
1500 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1501 struct sk_buff *skb, const struct nlmsghdr *nlh,
1502 const struct nlattr * const nla[],
1503 struct netlink_ext_ack *extack)
1505 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1506 u8 genmask = nft_genmask_cur(net);
1507 const struct nft_chain *chain;
1508 struct nft_table *table;
1509 struct sk_buff *skb2;
1510 int family = nfmsg->nfgen_family;
1513 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1514 struct netlink_dump_control c = {
1515 .dump = nf_tables_dump_chains,
1516 .module = THIS_MODULE,
1519 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1522 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1523 if (IS_ERR(table)) {
1524 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1525 return PTR_ERR(table);
1528 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1529 if (IS_ERR(chain)) {
1530 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1531 return PTR_ERR(chain);
1534 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1538 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1539 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1540 family, table, chain);
1544 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1551 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1552 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1553 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1556 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1558 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1559 struct nft_stats __percpu *newstats;
1560 struct nft_stats *stats;
1563 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1564 nft_counter_policy, NULL);
1566 return ERR_PTR(err);
1568 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1569 return ERR_PTR(-EINVAL);
1571 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1572 if (newstats == NULL)
1573 return ERR_PTR(-ENOMEM);
1575 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1576 * are not exposed to userspace.
1579 stats = this_cpu_ptr(newstats);
1580 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1581 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1587 static void nft_chain_stats_replace(struct nft_trans *trans)
1589 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1591 if (!nft_trans_chain_stats(trans))
1594 nft_trans_chain_stats(trans) =
1595 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1596 lockdep_commit_lock_is_held(trans->ctx.net));
1598 if (!nft_trans_chain_stats(trans))
1599 static_branch_inc(&nft_counters_enabled);
1602 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1604 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1605 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1611 /* should be NULL either via abort or via successful commit */
1612 WARN_ON_ONCE(chain->rules_next);
1613 kvfree(chain->rules_next);
1616 static void nf_tables_chain_destroy(struct nft_ctx *ctx)
1618 struct nft_chain *chain = ctx->chain;
1619 struct nft_hook *hook, *next;
1621 if (WARN_ON(chain->use > 0))
1624 /* no concurrent access possible anymore */
1625 nf_tables_chain_free_chain_rules(chain);
1627 if (nft_is_base_chain(chain)) {
1628 struct nft_base_chain *basechain = nft_base_chain(chain);
1630 if (ctx->family == NFPROTO_NETDEV) {
1631 list_for_each_entry_safe(hook, next,
1632 &basechain->hook_list, list) {
1633 list_del_rcu(&hook->list);
1634 kfree_rcu(hook, rcu);
1637 module_put(basechain->type->owner);
1638 if (rcu_access_pointer(basechain->stats)) {
1639 static_branch_dec(&nft_counters_enabled);
1640 free_percpu(rcu_dereference_raw(basechain->stats));
1650 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1651 const struct nlattr *attr)
1653 struct net_device *dev;
1654 char ifname[IFNAMSIZ];
1655 struct nft_hook *hook;
1658 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1661 goto err_hook_alloc;
1664 nla_strlcpy(ifname, attr, IFNAMSIZ);
1665 dev = __dev_get_by_name(net, ifname);
1670 hook->ops.dev = dev;
1677 return ERR_PTR(err);
1680 static bool nft_hook_list_find(struct list_head *hook_list,
1681 const struct nft_hook *this)
1683 struct nft_hook *hook;
1685 list_for_each_entry(hook, hook_list, list) {
1686 if (this->ops.dev == hook->ops.dev)
1693 static int nf_tables_parse_netdev_hooks(struct net *net,
1694 const struct nlattr *attr,
1695 struct list_head *hook_list)
1697 struct nft_hook *hook, *next;
1698 const struct nlattr *tmp;
1699 int rem, n = 0, err;
1701 nla_for_each_nested(tmp, attr, rem) {
1702 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1707 hook = nft_netdev_hook_alloc(net, tmp);
1709 err = PTR_ERR(hook);
1712 if (nft_hook_list_find(hook_list, hook)) {
1717 list_add_tail(&hook->list, hook_list);
1720 if (n == NFT_NETDEVICE_MAX) {
1731 list_for_each_entry_safe(hook, next, hook_list, list) {
1732 list_del(&hook->list);
1738 struct nft_chain_hook {
1741 const struct nft_chain_type *type;
1742 struct list_head list;
1745 static int nft_chain_parse_netdev(struct net *net,
1746 struct nlattr *tb[],
1747 struct list_head *hook_list)
1749 struct nft_hook *hook;
1752 if (tb[NFTA_HOOK_DEV]) {
1753 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1755 return PTR_ERR(hook);
1757 list_add_tail(&hook->list, hook_list);
1758 } else if (tb[NFTA_HOOK_DEVS]) {
1759 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1770 static int nft_chain_parse_hook(struct net *net,
1771 const struct nlattr * const nla[],
1772 struct nft_chain_hook *hook, u8 family,
1775 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1776 const struct nft_chain_type *type;
1779 lockdep_assert_held(&net->nft.commit_mutex);
1780 lockdep_nfnl_nft_mutex_not_held();
1782 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1783 nla[NFTA_CHAIN_HOOK],
1784 nft_hook_policy, NULL);
1788 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1789 ha[NFTA_HOOK_PRIORITY] == NULL)
1792 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1793 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1795 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1799 if (nla[NFTA_CHAIN_TYPE]) {
1800 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1803 return PTR_ERR(type);
1805 if (hook->num > NF_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1808 if (type->type == NFT_CHAIN_T_NAT &&
1809 hook->priority <= NF_IP_PRI_CONNTRACK)
1812 if (!try_module_get(type->owner))
1817 INIT_LIST_HEAD(&hook->list);
1818 if (family == NFPROTO_NETDEV) {
1819 err = nft_chain_parse_netdev(net, ha, &hook->list);
1821 module_put(type->owner);
1824 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
1825 module_put(type->owner);
1832 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1834 struct nft_hook *h, *next;
1836 list_for_each_entry_safe(h, next, &hook->list, list) {
1840 module_put(hook->type->owner);
1843 struct nft_rules_old {
1845 struct nft_rule **start;
1848 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1851 if (alloc > INT_MAX)
1854 alloc += 1; /* NULL, ends rules */
1855 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1858 alloc *= sizeof(struct nft_rule *);
1859 alloc += sizeof(struct nft_rules_old);
1861 return kvmalloc(alloc, GFP_KERNEL);
1864 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
1865 const struct nft_chain_hook *hook,
1866 struct nft_chain *chain)
1869 ops->hooknum = hook->num;
1870 ops->priority = hook->priority;
1872 ops->hook = hook->type->hooks[ops->hooknum];
1875 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
1876 struct nft_chain_hook *hook, u32 flags)
1878 struct nft_chain *chain;
1881 basechain->type = hook->type;
1882 INIT_LIST_HEAD(&basechain->hook_list);
1883 chain = &basechain->chain;
1885 if (family == NFPROTO_NETDEV) {
1886 list_splice_init(&hook->list, &basechain->hook_list);
1887 list_for_each_entry(h, &basechain->hook_list, list)
1888 nft_basechain_hook_init(&h->ops, family, hook, chain);
1890 basechain->ops.hooknum = hook->num;
1891 basechain->ops.priority = hook->priority;
1893 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
1896 chain->flags |= NFT_BASE_CHAIN | flags;
1897 basechain->policy = NF_ACCEPT;
1898 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
1899 nft_chain_offload_priority(basechain) < 0)
1902 flow_block_init(&basechain->flow_block);
1907 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1908 u8 policy, u32 flags)
1910 const struct nlattr * const *nla = ctx->nla;
1911 struct nft_table *table = ctx->table;
1912 struct nft_base_chain *basechain;
1913 struct nft_stats __percpu *stats;
1914 struct net *net = ctx->net;
1915 struct nft_trans *trans;
1916 struct nft_chain *chain;
1917 struct nft_rule **rules;
1920 if (table->use == UINT_MAX)
1923 if (nla[NFTA_CHAIN_HOOK]) {
1924 struct nft_chain_hook hook;
1926 err = nft_chain_parse_hook(net, nla, &hook, family, true);
1930 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1931 if (basechain == NULL) {
1932 nft_chain_release_hook(&hook);
1935 chain = &basechain->chain;
1937 if (nla[NFTA_CHAIN_COUNTERS]) {
1938 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1939 if (IS_ERR(stats)) {
1940 nft_chain_release_hook(&hook);
1942 return PTR_ERR(stats);
1944 rcu_assign_pointer(basechain->stats, stats);
1945 static_branch_inc(&nft_counters_enabled);
1948 err = nft_basechain_init(basechain, family, &hook, flags);
1950 nft_chain_release_hook(&hook);
1955 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1961 INIT_LIST_HEAD(&chain->rules);
1962 chain->handle = nf_tables_alloc_handle(table);
1963 chain->table = table;
1964 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1970 rules = nf_tables_chain_alloc_rules(chain, 0);
1977 rcu_assign_pointer(chain->rules_gen_0, rules);
1978 rcu_assign_pointer(chain->rules_gen_1, rules);
1980 err = nf_tables_register_hook(net, table, chain);
1984 err = rhltable_insert_key(&table->chains_ht, chain->name,
1985 &chain->rhlhead, nft_chain_ht_params);
1989 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1990 if (IS_ERR(trans)) {
1991 err = PTR_ERR(trans);
1992 rhltable_remove(&table->chains_ht, &chain->rhlhead,
1993 nft_chain_ht_params);
1997 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
1998 if (nft_is_base_chain(chain))
1999 nft_trans_chain_policy(trans) = policy;
2002 list_add_tail_rcu(&chain->list, &table->chains);
2006 nf_tables_unregister_hook(net, table, chain);
2008 nf_tables_chain_destroy(ctx);
2013 static bool nft_hook_list_equal(struct list_head *hook_list1,
2014 struct list_head *hook_list2)
2016 struct nft_hook *hook;
2020 list_for_each_entry(hook, hook_list2, list) {
2021 if (!nft_hook_list_find(hook_list1, hook))
2026 list_for_each_entry(hook, hook_list1, list)
2032 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2035 const struct nlattr * const *nla = ctx->nla;
2036 struct nft_table *table = ctx->table;
2037 struct nft_chain *chain = ctx->chain;
2038 struct nft_base_chain *basechain;
2039 struct nft_stats *stats = NULL;
2040 struct nft_chain_hook hook;
2041 struct nf_hook_ops *ops;
2042 struct nft_trans *trans;
2045 if (chain->flags ^ flags)
2048 if (nla[NFTA_CHAIN_HOOK]) {
2049 if (!nft_is_base_chain(chain))
2052 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2057 basechain = nft_base_chain(chain);
2058 if (basechain->type != hook.type) {
2059 nft_chain_release_hook(&hook);
2063 if (ctx->family == NFPROTO_NETDEV) {
2064 if (!nft_hook_list_equal(&basechain->hook_list,
2066 nft_chain_release_hook(&hook);
2070 ops = &basechain->ops;
2071 if (ops->hooknum != hook.num ||
2072 ops->priority != hook.priority) {
2073 nft_chain_release_hook(&hook);
2077 nft_chain_release_hook(&hook);
2080 if (nla[NFTA_CHAIN_HANDLE] &&
2081 nla[NFTA_CHAIN_NAME]) {
2082 struct nft_chain *chain2;
2084 chain2 = nft_chain_lookup(ctx->net, table,
2085 nla[NFTA_CHAIN_NAME], genmask);
2086 if (!IS_ERR(chain2))
2090 if (nla[NFTA_CHAIN_COUNTERS]) {
2091 if (!nft_is_base_chain(chain))
2094 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2096 return PTR_ERR(stats);
2100 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2101 sizeof(struct nft_trans_chain));
2105 nft_trans_chain_stats(trans) = stats;
2106 nft_trans_chain_update(trans) = true;
2108 if (nla[NFTA_CHAIN_POLICY])
2109 nft_trans_chain_policy(trans) = policy;
2111 nft_trans_chain_policy(trans) = -1;
2113 if (nla[NFTA_CHAIN_HANDLE] &&
2114 nla[NFTA_CHAIN_NAME]) {
2115 struct nft_trans *tmp;
2119 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2124 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
2125 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2126 tmp->ctx.table == table &&
2127 nft_trans_chain_update(tmp) &&
2128 nft_trans_chain_name(tmp) &&
2129 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2135 nft_trans_chain_name(trans) = name;
2137 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2146 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
2147 struct sk_buff *skb, const struct nlmsghdr *nlh,
2148 const struct nlattr * const nla[],
2149 struct netlink_ext_ack *extack)
2151 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2152 u8 genmask = nft_genmask_next(net);
2153 int family = nfmsg->nfgen_family;
2154 const struct nlattr *attr;
2155 struct nft_table *table;
2156 struct nft_chain *chain;
2157 u8 policy = NF_ACCEPT;
2162 lockdep_assert_held(&net->nft.commit_mutex);
2164 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2165 if (IS_ERR(table)) {
2166 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2167 return PTR_ERR(table);
2171 attr = nla[NFTA_CHAIN_NAME];
2173 if (nla[NFTA_CHAIN_HANDLE]) {
2174 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2175 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2176 if (IS_ERR(chain)) {
2177 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2178 return PTR_ERR(chain);
2180 attr = nla[NFTA_CHAIN_HANDLE];
2182 chain = nft_chain_lookup(net, table, attr, genmask);
2183 if (IS_ERR(chain)) {
2184 if (PTR_ERR(chain) != -ENOENT) {
2185 NL_SET_BAD_ATTR(extack, attr);
2186 return PTR_ERR(chain);
2192 if (nla[NFTA_CHAIN_POLICY]) {
2193 if (chain != NULL &&
2194 !nft_is_base_chain(chain)) {
2195 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2199 if (chain == NULL &&
2200 nla[NFTA_CHAIN_HOOK] == NULL) {
2201 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2205 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2215 if (nla[NFTA_CHAIN_FLAGS])
2216 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2218 flags = chain->flags;
2220 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2222 if (chain != NULL) {
2223 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2224 NL_SET_BAD_ATTR(extack, attr);
2227 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2230 flags |= chain->flags & NFT_BASE_CHAIN;
2231 return nf_tables_updchain(&ctx, genmask, policy, flags);
2234 return nf_tables_addchain(&ctx, family, genmask, policy, flags);
2237 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
2238 struct sk_buff *skb, const struct nlmsghdr *nlh,
2239 const struct nlattr * const nla[],
2240 struct netlink_ext_ack *extack)
2242 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2243 u8 genmask = nft_genmask_next(net);
2244 int family = nfmsg->nfgen_family;
2245 const struct nlattr *attr;
2246 struct nft_table *table;
2247 struct nft_chain *chain;
2248 struct nft_rule *rule;
2254 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2255 if (IS_ERR(table)) {
2256 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2257 return PTR_ERR(table);
2260 if (nla[NFTA_CHAIN_HANDLE]) {
2261 attr = nla[NFTA_CHAIN_HANDLE];
2262 handle = be64_to_cpu(nla_get_be64(attr));
2263 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2265 attr = nla[NFTA_CHAIN_NAME];
2266 chain = nft_chain_lookup(net, table, attr, genmask);
2268 if (IS_ERR(chain)) {
2269 NL_SET_BAD_ATTR(extack, attr);
2270 return PTR_ERR(chain);
2273 if (nlh->nlmsg_flags & NLM_F_NONREC &&
2277 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2280 list_for_each_entry(rule, &chain->rules, list) {
2281 if (!nft_is_active_next(net, rule))
2285 err = nft_delrule(&ctx, rule);
2290 /* There are rules and elements that are still holding references to us,
2291 * we cannot do a recursive removal in this case.
2294 NL_SET_BAD_ATTR(extack, attr);
2298 return nft_delchain(&ctx);
2306 * nft_register_expr - register nf_tables expr type
2309 * Registers the expr type for use with nf_tables. Returns zero on
2310 * success or a negative errno code otherwise.
2312 int nft_register_expr(struct nft_expr_type *type)
2314 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2315 if (type->family == NFPROTO_UNSPEC)
2316 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2318 list_add_rcu(&type->list, &nf_tables_expressions);
2319 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2322 EXPORT_SYMBOL_GPL(nft_register_expr);
2325 * nft_unregister_expr - unregister nf_tables expr type
2328 * Unregisters the expr typefor use with nf_tables.
2330 void nft_unregister_expr(struct nft_expr_type *type)
2332 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2333 list_del_rcu(&type->list);
2334 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2336 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2338 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2341 const struct nft_expr_type *type, *candidate = NULL;
2343 list_for_each_entry(type, &nf_tables_expressions, list) {
2344 if (!nla_strcmp(nla, type->name)) {
2345 if (!type->family && !candidate)
2347 else if (type->family == family)
2354 #ifdef CONFIG_MODULES
2355 static int nft_expr_type_request_module(struct net *net, u8 family,
2358 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2359 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2366 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2370 const struct nft_expr_type *type;
2373 return ERR_PTR(-EINVAL);
2375 type = __nft_expr_type_get(family, nla);
2376 if (type != NULL && try_module_get(type->owner))
2379 lockdep_nfnl_nft_mutex_not_held();
2380 #ifdef CONFIG_MODULES
2382 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2383 return ERR_PTR(-EAGAIN);
2385 if (nft_request_module(net, "nft-expr-%.*s",
2387 (char *)nla_data(nla)) == -EAGAIN)
2388 return ERR_PTR(-EAGAIN);
2391 return ERR_PTR(-ENOENT);
2394 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2395 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2396 .len = NFT_MODULE_AUTOLOAD_LIMIT },
2397 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2400 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2401 const struct nft_expr *expr)
2403 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2404 goto nla_put_failure;
2406 if (expr->ops->dump) {
2407 struct nlattr *data = nla_nest_start_noflag(skb,
2410 goto nla_put_failure;
2411 if (expr->ops->dump(skb, expr) < 0)
2412 goto nla_put_failure;
2413 nla_nest_end(skb, data);
2422 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2423 const struct nft_expr *expr)
2425 struct nlattr *nest;
2427 nest = nla_nest_start_noflag(skb, attr);
2429 goto nla_put_failure;
2430 if (nf_tables_fill_expr_info(skb, expr) < 0)
2431 goto nla_put_failure;
2432 nla_nest_end(skb, nest);
2439 struct nft_expr_info {
2440 const struct nft_expr_ops *ops;
2441 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2444 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2445 const struct nlattr *nla,
2446 struct nft_expr_info *info)
2448 const struct nft_expr_type *type;
2449 const struct nft_expr_ops *ops;
2450 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2453 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2454 nft_expr_policy, NULL);
2458 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2460 return PTR_ERR(type);
2462 if (tb[NFTA_EXPR_DATA]) {
2463 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2465 type->policy, NULL);
2469 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2471 if (type->select_ops != NULL) {
2472 ops = type->select_ops(ctx,
2473 (const struct nlattr * const *)info->tb);
2476 #ifdef CONFIG_MODULES
2478 if (nft_expr_type_request_module(ctx->net,
2480 tb[NFTA_EXPR_NAME]) != -EAGAIN)
2492 module_put(type->owner);
2496 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2497 const struct nft_expr_info *info,
2498 struct nft_expr *expr)
2500 const struct nft_expr_ops *ops = info->ops;
2505 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2516 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2517 struct nft_expr *expr)
2519 const struct nft_expr_type *type = expr->ops->type;
2521 if (expr->ops->destroy)
2522 expr->ops->destroy(ctx, expr);
2523 module_put(type->owner);
2526 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2527 const struct nlattr *nla)
2529 struct nft_expr_info info;
2530 struct nft_expr *expr;
2531 struct module *owner;
2534 err = nf_tables_expr_parse(ctx, nla, &info);
2539 expr = kzalloc(info.ops->size, GFP_KERNEL);
2543 err = nf_tables_newexpr(ctx, &info, expr);
2551 owner = info.ops->type->owner;
2552 if (info.ops->type->release_ops)
2553 info.ops->type->release_ops(info.ops);
2557 return ERR_PTR(err);
2560 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2562 nf_tables_expr_destroy(ctx, expr);
2570 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2573 struct nft_rule *rule;
2575 // FIXME: this sucks
2576 list_for_each_entry_rcu(rule, &chain->rules, list) {
2577 if (handle == rule->handle)
2581 return ERR_PTR(-ENOENT);
2584 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2585 const struct nlattr *nla)
2588 return ERR_PTR(-EINVAL);
2590 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2593 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2594 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2595 .len = NFT_TABLE_MAXNAMELEN - 1 },
2596 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2597 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2598 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2599 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2600 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2601 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2602 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2603 .len = NFT_USERDATA_MAXLEN },
2604 [NFTA_RULE_ID] = { .type = NLA_U32 },
2605 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2608 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2609 u32 portid, u32 seq, int event,
2610 u32 flags, int family,
2611 const struct nft_table *table,
2612 const struct nft_chain *chain,
2613 const struct nft_rule *rule,
2614 const struct nft_rule *prule)
2616 struct nlmsghdr *nlh;
2617 struct nfgenmsg *nfmsg;
2618 const struct nft_expr *expr, *next;
2619 struct nlattr *list;
2620 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2622 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2624 goto nla_put_failure;
2626 nfmsg = nlmsg_data(nlh);
2627 nfmsg->nfgen_family = family;
2628 nfmsg->version = NFNETLINK_V0;
2629 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
2631 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2632 goto nla_put_failure;
2633 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2634 goto nla_put_failure;
2635 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2637 goto nla_put_failure;
2639 if (event != NFT_MSG_DELRULE && prule) {
2640 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2641 cpu_to_be64(prule->handle),
2643 goto nla_put_failure;
2646 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2648 goto nla_put_failure;
2649 nft_rule_for_each_expr(expr, next, rule) {
2650 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2651 goto nla_put_failure;
2653 nla_nest_end(skb, list);
2656 struct nft_userdata *udata = nft_userdata(rule);
2657 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2659 goto nla_put_failure;
2662 nlmsg_end(skb, nlh);
2666 nlmsg_trim(skb, nlh);
2670 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2671 const struct nft_rule *rule, int event)
2673 struct sk_buff *skb;
2677 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2680 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2684 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2685 event, 0, ctx->family, ctx->table,
2686 ctx->chain, rule, NULL);
2692 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2693 ctx->report, GFP_KERNEL);
2696 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2699 struct nft_rule_dump_ctx {
2704 static int __nf_tables_dump_rules(struct sk_buff *skb,
2706 struct netlink_callback *cb,
2707 const struct nft_table *table,
2708 const struct nft_chain *chain)
2710 struct net *net = sock_net(skb->sk);
2711 const struct nft_rule *rule, *prule;
2712 unsigned int s_idx = cb->args[0];
2715 list_for_each_entry_rcu(rule, &chain->rules, list) {
2716 if (!nft_is_active(net, rule))
2721 memset(&cb->args[1], 0,
2722 sizeof(cb->args) - sizeof(cb->args[0]));
2724 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2727 NLM_F_MULTI | NLM_F_APPEND,
2729 table, chain, rule, prule) < 0)
2732 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2741 static int nf_tables_dump_rules(struct sk_buff *skb,
2742 struct netlink_callback *cb)
2744 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2745 const struct nft_rule_dump_ctx *ctx = cb->data;
2746 struct nft_table *table;
2747 const struct nft_chain *chain;
2748 unsigned int idx = 0;
2749 struct net *net = sock_net(skb->sk);
2750 int family = nfmsg->nfgen_family;
2753 cb->seq = net->nft.base_seq;
2755 list_for_each_entry_rcu(table, &net->nft.tables, list) {
2756 if (family != NFPROTO_UNSPEC && family != table->family)
2759 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2762 if (ctx && ctx->table && ctx->chain) {
2763 struct rhlist_head *list, *tmp;
2765 list = rhltable_lookup(&table->chains_ht, ctx->chain,
2766 nft_chain_ht_params);
2770 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2771 if (!nft_is_active(net, chain))
2773 __nf_tables_dump_rules(skb, &idx,
2780 list_for_each_entry_rcu(chain, &table->chains, list) {
2781 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2785 if (ctx && ctx->table)
2795 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2797 const struct nlattr * const *nla = cb->data;
2798 struct nft_rule_dump_ctx *ctx = NULL;
2800 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2801 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2805 if (nla[NFTA_RULE_TABLE]) {
2806 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2813 if (nla[NFTA_RULE_CHAIN]) {
2814 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2828 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2830 struct nft_rule_dump_ctx *ctx = cb->data;
2840 /* called with rcu_read_lock held */
2841 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2842 struct sk_buff *skb, const struct nlmsghdr *nlh,
2843 const struct nlattr * const nla[],
2844 struct netlink_ext_ack *extack)
2846 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2847 u8 genmask = nft_genmask_cur(net);
2848 const struct nft_chain *chain;
2849 const struct nft_rule *rule;
2850 struct nft_table *table;
2851 struct sk_buff *skb2;
2852 int family = nfmsg->nfgen_family;
2855 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2856 struct netlink_dump_control c = {
2857 .start= nf_tables_dump_rules_start,
2858 .dump = nf_tables_dump_rules,
2859 .done = nf_tables_dump_rules_done,
2860 .module = THIS_MODULE,
2861 .data = (void *)nla,
2864 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
2867 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2868 if (IS_ERR(table)) {
2869 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2870 return PTR_ERR(table);
2873 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2874 if (IS_ERR(chain)) {
2875 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2876 return PTR_ERR(chain);
2879 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2881 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2882 return PTR_ERR(rule);
2885 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
2889 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2890 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2891 family, table, chain, rule, NULL);
2895 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2902 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2903 struct nft_rule *rule)
2905 struct nft_expr *expr, *next;
2908 * Careful: some expressions might not be initialized in case this
2909 * is called on error from nf_tables_newrule().
2911 expr = nft_expr_first(rule);
2912 while (expr != nft_expr_last(rule) && expr->ops) {
2913 next = nft_expr_next(expr);
2914 nf_tables_expr_destroy(ctx, expr);
2920 static void nf_tables_rule_release(const struct nft_ctx *ctx,
2921 struct nft_rule *rule)
2923 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
2924 nf_tables_rule_destroy(ctx, rule);
2927 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
2929 struct nft_expr *expr, *last;
2930 const struct nft_data *data;
2931 struct nft_rule *rule;
2934 if (ctx->level == NFT_JUMP_STACK_SIZE)
2937 list_for_each_entry(rule, &chain->rules, list) {
2938 if (!nft_is_active_next(ctx->net, rule))
2941 nft_rule_for_each_expr(expr, last, rule) {
2942 if (!expr->ops->validate)
2945 err = expr->ops->validate(ctx, expr, &data);
2953 EXPORT_SYMBOL_GPL(nft_chain_validate);
2955 static int nft_table_validate(struct net *net, const struct nft_table *table)
2957 struct nft_chain *chain;
2958 struct nft_ctx ctx = {
2960 .family = table->family,
2964 list_for_each_entry(chain, &table->chains, list) {
2965 if (!nft_is_base_chain(chain))
2969 err = nft_chain_validate(&ctx, chain);
2977 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2978 const struct nlattr *nla);
2980 #define NFT_RULE_MAXEXPRS 128
2982 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2983 struct sk_buff *skb, const struct nlmsghdr *nlh,
2984 const struct nlattr * const nla[],
2985 struct netlink_ext_ack *extack)
2987 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2988 u8 genmask = nft_genmask_next(net);
2989 struct nft_expr_info *info = NULL;
2990 int family = nfmsg->nfgen_family;
2991 struct nft_flow_rule *flow;
2992 struct nft_table *table;
2993 struct nft_chain *chain;
2994 struct nft_rule *rule, *old_rule = NULL;
2995 struct nft_userdata *udata;
2996 struct nft_trans *trans = NULL;
2997 struct nft_expr *expr;
3000 unsigned int size, i, n, ulen = 0, usize = 0;
3002 u64 handle, pos_handle;
3004 lockdep_assert_held(&net->nft.commit_mutex);
3006 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3007 if (IS_ERR(table)) {
3008 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3009 return PTR_ERR(table);
3012 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3013 if (IS_ERR(chain)) {
3014 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3015 return PTR_ERR(chain);
3018 if (nla[NFTA_RULE_HANDLE]) {
3019 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3020 rule = __nft_rule_lookup(chain, handle);
3022 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3023 return PTR_ERR(rule);
3026 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3027 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3030 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3035 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
3036 nlh->nlmsg_flags & NLM_F_REPLACE)
3038 handle = nf_tables_alloc_handle(table);
3040 if (chain->use == UINT_MAX)
3043 if (nla[NFTA_RULE_POSITION]) {
3044 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3045 old_rule = __nft_rule_lookup(chain, pos_handle);
3046 if (IS_ERR(old_rule)) {
3047 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3048 return PTR_ERR(old_rule);
3050 } else if (nla[NFTA_RULE_POSITION_ID]) {
3051 old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3052 if (IS_ERR(old_rule)) {
3053 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3054 return PTR_ERR(old_rule);
3059 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3063 if (nla[NFTA_RULE_EXPRESSIONS]) {
3064 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3065 sizeof(struct nft_expr_info),
3070 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3072 if (nla_type(tmp) != NFTA_LIST_ELEM)
3074 if (n == NFT_RULE_MAXEXPRS)
3076 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
3079 size += info[n].ops->size;
3083 /* Check for overflow of dlen field */
3085 if (size >= 1 << 12)
3088 if (nla[NFTA_RULE_USERDATA]) {
3089 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3091 usize = sizeof(struct nft_userdata) + ulen;
3095 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3099 nft_activate_next(net, rule);
3101 rule->handle = handle;
3103 rule->udata = ulen ? 1 : 0;
3106 udata = nft_userdata(rule);
3107 udata->len = ulen - 1;
3108 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3111 expr = nft_expr_first(rule);
3112 for (i = 0; i < n; i++) {
3113 err = nf_tables_newexpr(&ctx, &info[i], expr);
3117 if (info[i].ops->validate)
3118 nft_validate_state_update(net, NFT_VALIDATE_NEED);
3121 expr = nft_expr_next(expr);
3124 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
3125 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3126 if (trans == NULL) {
3130 err = nft_delrule(&ctx, old_rule);
3132 nft_trans_destroy(trans);
3136 list_add_tail_rcu(&rule->list, &old_rule->list);
3138 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3144 if (nlh->nlmsg_flags & NLM_F_APPEND) {
3146 list_add_rcu(&rule->list, &old_rule->list);
3148 list_add_tail_rcu(&rule->list, &chain->rules);
3151 list_add_tail_rcu(&rule->list, &old_rule->list);
3153 list_add_rcu(&rule->list, &chain->rules);
3159 if (net->nft.validate_state == NFT_VALIDATE_DO)
3160 return nft_table_validate(net, table);
3162 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3163 flow = nft_flow_rule_create(net, rule);
3165 return PTR_ERR(flow);
3167 nft_trans_flow_rule(trans) = flow;
3172 nf_tables_rule_release(&ctx, rule);
3174 for (i = 0; i < n; i++) {
3176 module_put(info[i].ops->type->owner);
3177 if (info[i].ops->type->release_ops)
3178 info[i].ops->type->release_ops(info[i].ops);
3185 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3186 const struct nlattr *nla)
3188 u32 id = ntohl(nla_get_be32(nla));
3189 struct nft_trans *trans;
3191 list_for_each_entry(trans, &net->nft.commit_list, list) {
3192 struct nft_rule *rule = nft_trans_rule(trans);
3194 if (trans->msg_type == NFT_MSG_NEWRULE &&
3195 id == nft_trans_rule_id(trans))
3198 return ERR_PTR(-ENOENT);
3201 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
3202 struct sk_buff *skb, const struct nlmsghdr *nlh,
3203 const struct nlattr * const nla[],
3204 struct netlink_ext_ack *extack)
3206 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3207 u8 genmask = nft_genmask_next(net);
3208 struct nft_table *table;
3209 struct nft_chain *chain = NULL;
3210 struct nft_rule *rule;
3211 int family = nfmsg->nfgen_family, err = 0;
3214 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3215 if (IS_ERR(table)) {
3216 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3217 return PTR_ERR(table);
3220 if (nla[NFTA_RULE_CHAIN]) {
3221 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3223 if (IS_ERR(chain)) {
3224 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3225 return PTR_ERR(chain);
3229 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3232 if (nla[NFTA_RULE_HANDLE]) {
3233 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3235 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3236 return PTR_ERR(rule);
3239 err = nft_delrule(&ctx, rule);
3240 } else if (nla[NFTA_RULE_ID]) {
3241 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3243 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3244 return PTR_ERR(rule);
3247 err = nft_delrule(&ctx, rule);
3249 err = nft_delrule_by_chain(&ctx);
3252 list_for_each_entry(chain, &table->chains, list) {
3253 if (!nft_is_active_next(net, chain))
3257 err = nft_delrule_by_chain(&ctx);
3270 static LIST_HEAD(nf_tables_set_types);
3272 int nft_register_set(struct nft_set_type *type)
3274 nfnl_lock(NFNL_SUBSYS_NFTABLES);
3275 list_add_tail_rcu(&type->list, &nf_tables_set_types);
3276 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3279 EXPORT_SYMBOL_GPL(nft_register_set);
3281 void nft_unregister_set(struct nft_set_type *type)
3283 nfnl_lock(NFNL_SUBSYS_NFTABLES);
3284 list_del_rcu(&type->list);
3285 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3287 EXPORT_SYMBOL_GPL(nft_unregister_set);
3289 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
3290 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3293 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3295 return (flags & type->features) == (flags & NFT_SET_FEATURES);
3299 * Select a set implementation based on the data characteristics and the
3300 * given policy. The total memory use might not be known if no size is
3301 * given, in that case the amount of memory per element is used.
3303 static const struct nft_set_ops *
3304 nft_select_set_ops(const struct nft_ctx *ctx,
3305 const struct nlattr * const nla[],
3306 const struct nft_set_desc *desc,
3307 enum nft_set_policies policy)
3309 const struct nft_set_ops *ops, *bops;
3310 struct nft_set_estimate est, best;
3311 const struct nft_set_type *type;
3314 lockdep_assert_held(&ctx->net->nft.commit_mutex);
3315 lockdep_nfnl_nft_mutex_not_held();
3316 #ifdef CONFIG_MODULES
3317 if (list_empty(&nf_tables_set_types)) {
3318 if (nft_request_module(ctx->net, "nft-set") == -EAGAIN)
3319 return ERR_PTR(-EAGAIN);
3322 if (nla[NFTA_SET_FLAGS] != NULL)
3323 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3330 list_for_each_entry(type, &nf_tables_set_types, list) {
3333 if (!nft_set_ops_candidate(type, flags))
3335 if (!ops->estimate(desc, flags, &est))
3339 case NFT_SET_POL_PERFORMANCE:
3340 if (est.lookup < best.lookup)
3342 if (est.lookup == best.lookup &&
3343 est.space < best.space)
3346 case NFT_SET_POL_MEMORY:
3348 if (est.space < best.space)
3350 if (est.space == best.space &&
3351 est.lookup < best.lookup)
3353 } else if (est.size < best.size || !bops) {
3361 if (!try_module_get(type->owner))
3364 module_put(to_set_type(bops)->owner);
3373 return ERR_PTR(-EOPNOTSUPP);
3376 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3377 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3378 .len = NFT_TABLE_MAXNAMELEN - 1 },
3379 [NFTA_SET_NAME] = { .type = NLA_STRING,
3380 .len = NFT_SET_MAXNAMELEN - 1 },
3381 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3382 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3383 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3384 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3385 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
3386 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3387 [NFTA_SET_DESC] = { .type = NLA_NESTED },
3388 [NFTA_SET_ID] = { .type = NLA_U32 },
3389 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3390 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
3391 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3392 .len = NFT_USERDATA_MAXLEN },
3393 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3394 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
3397 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3398 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
3399 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
3402 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
3403 const struct sk_buff *skb,
3404 const struct nlmsghdr *nlh,
3405 const struct nlattr * const nla[],
3406 struct netlink_ext_ack *extack,
3409 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3410 int family = nfmsg->nfgen_family;
3411 struct nft_table *table = NULL;
3413 if (nla[NFTA_SET_TABLE] != NULL) {
3414 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3416 if (IS_ERR(table)) {
3417 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3418 return PTR_ERR(table);
3422 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3426 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3427 const struct nlattr *nla, u8 genmask)
3429 struct nft_set *set;
3432 return ERR_PTR(-EINVAL);
3434 list_for_each_entry_rcu(set, &table->sets, list) {
3435 if (!nla_strcmp(nla, set->name) &&
3436 nft_active_genmask(set, genmask))
3439 return ERR_PTR(-ENOENT);
3442 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3443 const struct nlattr *nla,
3446 struct nft_set *set;
3448 list_for_each_entry(set, &table->sets, list) {
3449 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3450 nft_active_genmask(set, genmask))
3453 return ERR_PTR(-ENOENT);
3456 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3457 const struct nlattr *nla, u8 genmask)
3459 struct nft_trans *trans;
3460 u32 id = ntohl(nla_get_be32(nla));
3462 list_for_each_entry(trans, &net->nft.commit_list, list) {
3463 if (trans->msg_type == NFT_MSG_NEWSET) {
3464 struct nft_set *set = nft_trans_set(trans);
3466 if (id == nft_trans_set_id(trans) &&
3467 nft_active_genmask(set, genmask))
3471 return ERR_PTR(-ENOENT);
3474 struct nft_set *nft_set_lookup_global(const struct net *net,
3475 const struct nft_table *table,
3476 const struct nlattr *nla_set_name,
3477 const struct nlattr *nla_set_id,
3480 struct nft_set *set;
3482 set = nft_set_lookup(table, nla_set_name, genmask);
3487 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3491 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3493 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3496 const struct nft_set *i;
3498 unsigned long *inuse;
3499 unsigned int n = 0, min = 0;
3501 p = strchr(name, '%');
3503 if (p[1] != 'd' || strchr(p + 2, '%'))
3506 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3510 list_for_each_entry(i, &ctx->table->sets, list) {
3513 if (!nft_is_active_next(ctx->net, set))
3515 if (!sscanf(i->name, name, &tmp))
3517 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3520 set_bit(tmp - min, inuse);
3523 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3524 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3525 min += BITS_PER_BYTE * PAGE_SIZE;
3526 memset(inuse, 0, PAGE_SIZE);
3529 free_page((unsigned long)inuse);
3532 set->name = kasprintf(GFP_KERNEL, name, min + n);
3536 list_for_each_entry(i, &ctx->table->sets, list) {
3537 if (!nft_is_active_next(ctx->net, i))
3539 if (!strcmp(set->name, i->name)) {
3547 static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3549 u64 ms = be64_to_cpu(nla_get_be64(nla));
3550 u64 max = (u64)(~((u64)0));
3552 max = div_u64(max, NSEC_PER_MSEC);
3556 ms *= NSEC_PER_MSEC;
3557 *result = nsecs_to_jiffies64(ms);
3561 static __be64 nf_jiffies64_to_msecs(u64 input)
3563 return cpu_to_be64(jiffies64_to_msecs(input));
3566 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3567 const struct nft_set *set)
3569 struct nlattr *concat, *field;
3572 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3576 for (i = 0; i < set->field_count; i++) {
3577 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3581 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3582 htonl(set->field_len[i])))
3585 nla_nest_end(skb, field);
3588 nla_nest_end(skb, concat);
3593 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3594 const struct nft_set *set, u16 event, u16 flags)
3596 struct nfgenmsg *nfmsg;
3597 struct nlmsghdr *nlh;
3598 struct nlattr *desc;
3599 u32 portid = ctx->portid;
3602 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3603 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3606 goto nla_put_failure;
3608 nfmsg = nlmsg_data(nlh);
3609 nfmsg->nfgen_family = ctx->family;
3610 nfmsg->version = NFNETLINK_V0;
3611 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3613 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3614 goto nla_put_failure;
3615 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3616 goto nla_put_failure;
3617 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3619 goto nla_put_failure;
3620 if (set->flags != 0)
3621 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3622 goto nla_put_failure;
3624 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3625 goto nla_put_failure;
3626 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3627 goto nla_put_failure;
3628 if (set->flags & NFT_SET_MAP) {
3629 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3630 goto nla_put_failure;
3631 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3632 goto nla_put_failure;
3634 if (set->flags & NFT_SET_OBJECT &&
3635 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3636 goto nla_put_failure;
3639 nla_put_be64(skb, NFTA_SET_TIMEOUT,
3640 nf_jiffies64_to_msecs(set->timeout),
3642 goto nla_put_failure;
3644 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3645 goto nla_put_failure;
3647 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3648 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3649 goto nla_put_failure;
3652 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3653 goto nla_put_failure;
3655 desc = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3658 goto nla_put_failure;
3660 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3661 goto nla_put_failure;
3663 if (set->field_count > 1 &&
3664 nf_tables_fill_set_concat(skb, set))
3665 goto nla_put_failure;
3667 nla_nest_end(skb, desc);
3669 nlmsg_end(skb, nlh);
3673 nlmsg_trim(skb, nlh);
3677 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3678 const struct nft_set *set, int event,
3681 struct sk_buff *skb;
3682 u32 portid = ctx->portid;
3686 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3689 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3693 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3699 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
3703 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3706 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3708 const struct nft_set *set;
3709 unsigned int idx, s_idx = cb->args[0];
3710 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3711 struct net *net = sock_net(skb->sk);
3712 struct nft_ctx *ctx = cb->data, ctx_set;
3718 cb->seq = net->nft.base_seq;
3720 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3721 if (ctx->family != NFPROTO_UNSPEC &&
3722 ctx->family != table->family)
3725 if (ctx->table && ctx->table != table)
3729 if (cur_table != table)
3735 list_for_each_entry_rcu(set, &table->sets, list) {
3738 if (!nft_is_active(net, set))
3742 ctx_set.table = table;
3743 ctx_set.family = table->family;
3745 if (nf_tables_fill_set(skb, &ctx_set, set,
3749 cb->args[2] = (unsigned long) table;
3752 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3765 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3767 struct nft_ctx *ctx_dump = NULL;
3769 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3770 if (ctx_dump == NULL)
3773 cb->data = ctx_dump;
3777 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3783 /* called with rcu_read_lock held */
3784 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3785 struct sk_buff *skb, const struct nlmsghdr *nlh,
3786 const struct nlattr * const nla[],
3787 struct netlink_ext_ack *extack)
3789 u8 genmask = nft_genmask_cur(net);
3790 const struct nft_set *set;
3792 struct sk_buff *skb2;
3793 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3796 /* Verify existence before starting dump */
3797 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3802 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3803 struct netlink_dump_control c = {
3804 .start = nf_tables_dump_sets_start,
3805 .dump = nf_tables_dump_sets,
3806 .done = nf_tables_dump_sets_done,
3808 .module = THIS_MODULE,
3811 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3814 /* Only accept unspec with dump */
3815 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3816 return -EAFNOSUPPORT;
3817 if (!nla[NFTA_SET_TABLE])
3820 set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3822 return PTR_ERR(set);
3824 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3828 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3832 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3839 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
3840 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
3843 static int nft_set_desc_concat_parse(const struct nlattr *attr,
3844 struct nft_set_desc *desc)
3846 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
3850 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
3851 nft_concat_policy, NULL);
3855 if (!tb[NFTA_SET_FIELD_LEN])
3858 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
3860 if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
3863 desc->field_len[desc->field_count++] = len;
3868 static int nft_set_desc_concat(struct nft_set_desc *desc,
3869 const struct nlattr *nla)
3871 struct nlattr *attr;
3874 nla_for_each_nested(attr, nla, rem) {
3875 if (nla_type(attr) != NFTA_LIST_ELEM)
3878 err = nft_set_desc_concat_parse(attr, desc);
3886 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
3887 const struct nlattr *nla)
3889 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
3892 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
3893 nft_set_desc_policy, NULL);
3897 if (da[NFTA_SET_DESC_SIZE] != NULL)
3898 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
3899 if (da[NFTA_SET_DESC_CONCAT])
3900 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
3905 static int nf_tables_newset(struct net *net, struct sock *nlsk,
3906 struct sk_buff *skb, const struct nlmsghdr *nlh,
3907 const struct nlattr * const nla[],
3908 struct netlink_ext_ack *extack)
3910 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3911 u8 genmask = nft_genmask_next(net);
3912 int family = nfmsg->nfgen_family;
3913 const struct nft_set_ops *ops;
3914 struct nft_table *table;
3915 struct nft_set *set;
3920 u32 ktype, dtype, flags, policy, gc_int, objtype;
3921 struct nft_set_desc desc;
3922 unsigned char *udata;
3927 if (nla[NFTA_SET_TABLE] == NULL ||
3928 nla[NFTA_SET_NAME] == NULL ||
3929 nla[NFTA_SET_KEY_LEN] == NULL ||
3930 nla[NFTA_SET_ID] == NULL)
3933 memset(&desc, 0, sizeof(desc));
3935 ktype = NFT_DATA_VALUE;
3936 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3937 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3938 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3942 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
3943 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
3947 if (nla[NFTA_SET_FLAGS] != NULL) {
3948 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3949 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
3950 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
3951 NFT_SET_MAP | NFT_SET_EVAL |
3954 /* Only one of these operations is supported */
3955 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
3956 (NFT_SET_MAP | NFT_SET_OBJECT))
3958 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3959 (NFT_SET_EVAL | NFT_SET_OBJECT))
3964 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3965 if (!(flags & NFT_SET_MAP))
3968 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3969 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3970 dtype != NFT_DATA_VERDICT)
3973 if (dtype != NFT_DATA_VERDICT) {
3974 if (nla[NFTA_SET_DATA_LEN] == NULL)
3976 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
3977 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
3980 desc.dlen = sizeof(struct nft_verdict);
3981 } else if (flags & NFT_SET_MAP)
3984 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3985 if (!(flags & NFT_SET_OBJECT))
3988 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3989 if (objtype == NFT_OBJECT_UNSPEC ||
3990 objtype > NFT_OBJECT_MAX)
3992 } else if (flags & NFT_SET_OBJECT)
3995 objtype = NFT_OBJECT_UNSPEC;
3998 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3999 if (!(flags & NFT_SET_TIMEOUT))
4002 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4007 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4008 if (!(flags & NFT_SET_TIMEOUT))
4010 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4013 policy = NFT_SET_POL_PERFORMANCE;
4014 if (nla[NFTA_SET_POLICY] != NULL)
4015 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4017 if (nla[NFTA_SET_DESC] != NULL) {
4018 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4023 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
4024 if (IS_ERR(table)) {
4025 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4026 return PTR_ERR(table);
4029 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
4031 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4033 if (PTR_ERR(set) != -ENOENT) {
4034 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4035 return PTR_ERR(set);
4038 if (nlh->nlmsg_flags & NLM_F_EXCL) {
4039 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4042 if (nlh->nlmsg_flags & NLM_F_REPLACE)
4048 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
4051 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4053 return PTR_ERR(ops);
4056 if (nla[NFTA_SET_USERDATA])
4057 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4060 if (ops->privsize != NULL)
4061 size = ops->privsize(nla, &desc);
4063 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
4069 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4075 err = nf_tables_set_alloc_name(&ctx, set, name);
4082 udata = set->data + size;
4083 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4086 INIT_LIST_HEAD(&set->bindings);
4088 write_pnet(&set->net, net);
4091 set->klen = desc.klen;
4093 set->objtype = objtype;
4094 set->dlen = desc.dlen;
4096 set->size = desc.size;
4097 set->policy = policy;
4100 set->timeout = timeout;
4101 set->gc_int = gc_int;
4102 set->handle = nf_tables_alloc_handle(table);
4104 set->field_count = desc.field_count;
4105 for (i = 0; i < desc.field_count; i++)
4106 set->field_len[i] = desc.field_len[i];
4108 err = ops->init(set, &desc, nla);
4112 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4116 list_add_tail_rcu(&set->list, &table->sets);
4127 module_put(to_set_type(ops)->owner);
4131 static void nft_set_destroy(struct nft_set *set)
4133 if (WARN_ON(set->use > 0))
4136 set->ops->destroy(set);
4137 module_put(to_set_type(set->ops)->owner);
4142 static int nf_tables_delset(struct net *net, struct sock *nlsk,
4143 struct sk_buff *skb, const struct nlmsghdr *nlh,
4144 const struct nlattr * const nla[],
4145 struct netlink_ext_ack *extack)
4147 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4148 u8 genmask = nft_genmask_next(net);
4149 const struct nlattr *attr;
4150 struct nft_set *set;
4154 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4155 return -EAFNOSUPPORT;
4156 if (nla[NFTA_SET_TABLE] == NULL)
4159 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
4164 if (nla[NFTA_SET_HANDLE]) {
4165 attr = nla[NFTA_SET_HANDLE];
4166 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
4168 attr = nla[NFTA_SET_NAME];
4169 set = nft_set_lookup(ctx.table, attr, genmask);
4173 NL_SET_BAD_ATTR(extack, attr);
4174 return PTR_ERR(set);
4177 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
4178 NL_SET_BAD_ATTR(extack, attr);
4182 return nft_delset(&ctx, set);
4185 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4186 struct nft_set *set,
4187 const struct nft_set_iter *iter,
4188 struct nft_set_elem *elem)
4190 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4191 enum nft_registers dreg;
4193 dreg = nft_type_to_reg(set->dtype);
4194 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4195 set->dtype == NFT_DATA_VERDICT ?
4196 NFT_DATA_VERDICT : NFT_DATA_VALUE,
4200 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4201 struct nft_set_binding *binding)
4203 struct nft_set_binding *i;
4204 struct nft_set_iter iter;
4206 if (set->use == UINT_MAX)
4209 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4212 if (binding->flags & NFT_SET_MAP) {
4213 /* If the set is already bound to the same chain all
4214 * jumps are already validated for that chain.
4216 list_for_each_entry(i, &set->bindings, list) {
4217 if (i->flags & NFT_SET_MAP &&
4218 i->chain == binding->chain)
4222 iter.genmask = nft_genmask_next(ctx->net);
4226 iter.fn = nf_tables_bind_check_setelem;
4228 set->ops->walk(ctx, set, &iter);
4233 binding->chain = ctx->chain;
4234 list_add_tail_rcu(&binding->list, &set->bindings);
4235 nft_set_trans_bind(ctx, set);
4240 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4242 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4243 struct nft_set_binding *binding, bool event)
4245 list_del_rcu(&binding->list);
4247 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4248 list_del_rcu(&set->list);
4250 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4255 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4256 struct nft_set_binding *binding,
4257 enum nft_trans_phase phase)
4260 case NFT_TRANS_PREPARE:
4263 case NFT_TRANS_ABORT:
4264 case NFT_TRANS_RELEASE:
4268 nf_tables_unbind_set(ctx, set, binding,
4269 phase == NFT_TRANS_COMMIT);
4272 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4274 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4276 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4277 nft_set_destroy(set);
4279 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4281 const struct nft_set_ext_type nft_set_ext_types[] = {
4282 [NFT_SET_EXT_KEY] = {
4283 .align = __alignof__(u32),
4285 [NFT_SET_EXT_DATA] = {
4286 .align = __alignof__(u32),
4288 [NFT_SET_EXT_EXPR] = {
4289 .align = __alignof__(struct nft_expr),
4291 [NFT_SET_EXT_OBJREF] = {
4292 .len = sizeof(struct nft_object *),
4293 .align = __alignof__(struct nft_object *),
4295 [NFT_SET_EXT_FLAGS] = {
4297 .align = __alignof__(u8),
4299 [NFT_SET_EXT_TIMEOUT] = {
4301 .align = __alignof__(u64),
4303 [NFT_SET_EXT_EXPIRATION] = {
4305 .align = __alignof__(u64),
4307 [NFT_SET_EXT_USERDATA] = {
4308 .len = sizeof(struct nft_userdata),
4309 .align = __alignof__(struct nft_userdata),
4311 [NFT_SET_EXT_KEY_END] = {
4312 .align = __alignof__(u32),
4315 EXPORT_SYMBOL_GPL(nft_set_ext_types);
4321 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4322 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
4323 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
4324 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
4325 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
4326 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
4327 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
4328 .len = NFT_USERDATA_MAXLEN },
4329 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
4330 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
4331 .len = NFT_OBJ_MAXNAMELEN - 1 },
4332 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
4335 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4336 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
4337 .len = NFT_TABLE_MAXNAMELEN - 1 },
4338 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
4339 .len = NFT_SET_MAXNAMELEN - 1 },
4340 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
4341 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
4344 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
4345 const struct sk_buff *skb,
4346 const struct nlmsghdr *nlh,
4347 const struct nlattr * const nla[],
4348 struct netlink_ext_ack *extack,
4351 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4352 int family = nfmsg->nfgen_family;
4353 struct nft_table *table;
4355 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
4357 if (IS_ERR(table)) {
4358 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
4359 return PTR_ERR(table);
4362 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
4366 static int nf_tables_fill_setelem(struct sk_buff *skb,
4367 const struct nft_set *set,
4368 const struct nft_set_elem *elem)
4370 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4371 unsigned char *b = skb_tail_pointer(skb);
4372 struct nlattr *nest;
4374 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4376 goto nla_put_failure;
4378 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4379 NFT_DATA_VALUE, set->klen) < 0)
4380 goto nla_put_failure;
4382 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4383 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4384 NFT_DATA_VALUE, set->klen) < 0)
4385 goto nla_put_failure;
4387 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4388 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4389 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4391 goto nla_put_failure;
4393 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
4394 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
4395 goto nla_put_failure;
4397 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4398 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4399 (*nft_set_ext_obj(ext))->key.name) < 0)
4400 goto nla_put_failure;
4402 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4403 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4404 htonl(*nft_set_ext_flags(ext))))
4405 goto nla_put_failure;
4407 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4408 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4409 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4411 goto nla_put_failure;
4413 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4414 u64 expires, now = get_jiffies_64();
4416 expires = *nft_set_ext_expiration(ext);
4417 if (time_before64(now, expires))
4422 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4423 nf_jiffies64_to_msecs(expires),
4425 goto nla_put_failure;
4428 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4429 struct nft_userdata *udata;
4431 udata = nft_set_ext_userdata(ext);
4432 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4433 udata->len + 1, udata->data))
4434 goto nla_put_failure;
4437 nla_nest_end(skb, nest);
4445 struct nft_set_dump_args {
4446 const struct netlink_callback *cb;
4447 struct nft_set_iter iter;
4448 struct sk_buff *skb;
4451 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4452 struct nft_set *set,
4453 const struct nft_set_iter *iter,
4454 struct nft_set_elem *elem)
4456 struct nft_set_dump_args *args;
4458 args = container_of(iter, struct nft_set_dump_args, iter);
4459 return nf_tables_fill_setelem(args->skb, set, elem);
4462 struct nft_set_dump_ctx {
4463 const struct nft_set *set;
4467 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4469 struct nft_set_dump_ctx *dump_ctx = cb->data;
4470 struct net *net = sock_net(skb->sk);
4471 struct nft_table *table;
4472 struct nft_set *set;
4473 struct nft_set_dump_args args;
4474 bool set_found = false;
4475 struct nfgenmsg *nfmsg;
4476 struct nlmsghdr *nlh;
4477 struct nlattr *nest;
4482 list_for_each_entry_rcu(table, &net->nft.tables, list) {
4483 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4484 dump_ctx->ctx.family != table->family)
4487 if (table != dump_ctx->ctx.table)
4490 list_for_each_entry_rcu(set, &table->sets, list) {
4491 if (set == dump_ctx->set) {
4504 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4505 portid = NETLINK_CB(cb->skb).portid;
4506 seq = cb->nlh->nlmsg_seq;
4508 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4511 goto nla_put_failure;
4513 nfmsg = nlmsg_data(nlh);
4514 nfmsg->nfgen_family = table->family;
4515 nfmsg->version = NFNETLINK_V0;
4516 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4518 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4519 goto nla_put_failure;
4520 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4521 goto nla_put_failure;
4523 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4525 goto nla_put_failure;
4529 args.iter.genmask = nft_genmask_cur(net);
4530 args.iter.skip = cb->args[0];
4531 args.iter.count = 0;
4533 args.iter.fn = nf_tables_dump_setelem;
4534 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4537 nla_nest_end(skb, nest);
4538 nlmsg_end(skb, nlh);
4540 if (args.iter.err && args.iter.err != -EMSGSIZE)
4541 return args.iter.err;
4542 if (args.iter.count == cb->args[0])
4545 cb->args[0] = args.iter.count;
4553 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4555 struct nft_set_dump_ctx *dump_ctx = cb->data;
4557 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4559 return cb->data ? 0 : -ENOMEM;
4562 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4568 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4569 const struct nft_ctx *ctx, u32 seq,
4570 u32 portid, int event, u16 flags,
4571 const struct nft_set *set,
4572 const struct nft_set_elem *elem)
4574 struct nfgenmsg *nfmsg;
4575 struct nlmsghdr *nlh;
4576 struct nlattr *nest;
4579 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4580 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4583 goto nla_put_failure;
4585 nfmsg = nlmsg_data(nlh);
4586 nfmsg->nfgen_family = ctx->family;
4587 nfmsg->version = NFNETLINK_V0;
4588 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
4590 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4591 goto nla_put_failure;
4592 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4593 goto nla_put_failure;
4595 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4597 goto nla_put_failure;
4599 err = nf_tables_fill_setelem(skb, set, elem);
4601 goto nla_put_failure;
4603 nla_nest_end(skb, nest);
4605 nlmsg_end(skb, nlh);
4609 nlmsg_trim(skb, nlh);
4613 static int nft_setelem_parse_flags(const struct nft_set *set,
4614 const struct nlattr *attr, u32 *flags)
4619 *flags = ntohl(nla_get_be32(attr));
4620 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4622 if (!(set->flags & NFT_SET_INTERVAL) &&
4623 *flags & NFT_SET_ELEM_INTERVAL_END)
4629 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
4630 struct nft_data *key, struct nlattr *attr)
4632 struct nft_data_desc desc;
4635 err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
4639 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
4640 nft_data_release(key, desc.type);
4647 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4648 const struct nlattr *attr)
4650 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4651 struct nft_set_elem elem;
4652 struct sk_buff *skb;
4657 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4658 nft_set_elem_policy, NULL);
4662 if (!nla[NFTA_SET_ELEM_KEY])
4665 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4669 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
4670 nla[NFTA_SET_ELEM_KEY]);
4674 if (nla[NFTA_SET_ELEM_KEY_END]) {
4675 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
4676 nla[NFTA_SET_ELEM_KEY_END]);
4681 priv = set->ops->get(ctx->net, set, &elem, flags);
4683 return PTR_ERR(priv);
4688 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
4692 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4693 NFT_MSG_NEWSETELEM, 0, set, &elem);
4697 err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT);
4698 /* This avoids a loop in nfnetlink. */
4706 /* this avoids a loop in nfnetlink. */
4707 return err == -EAGAIN ? -ENOBUFS : err;
4710 /* called with rcu_read_lock held */
4711 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4712 struct sk_buff *skb, const struct nlmsghdr *nlh,
4713 const struct nlattr * const nla[],
4714 struct netlink_ext_ack *extack)
4716 u8 genmask = nft_genmask_cur(net);
4717 struct nft_set *set;
4718 struct nlattr *attr;
4722 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4727 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4729 return PTR_ERR(set);
4731 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4732 struct netlink_dump_control c = {
4733 .start = nf_tables_dump_set_start,
4734 .dump = nf_tables_dump_set,
4735 .done = nf_tables_dump_set_done,
4736 .module = THIS_MODULE,
4738 struct nft_set_dump_ctx dump_ctx = {
4744 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4747 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4750 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4751 err = nft_get_set_elem(&ctx, set, attr);
4759 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4760 const struct nft_set *set,
4761 const struct nft_set_elem *elem,
4762 int event, u16 flags)
4764 struct net *net = ctx->net;
4765 u32 portid = ctx->portid;
4766 struct sk_buff *skb;
4769 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4772 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4776 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
4783 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
4787 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4790 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
4792 struct nft_set *set)
4794 struct nft_trans *trans;
4796 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
4800 nft_trans_elem_set(trans) = set;
4804 void *nft_set_elem_init(const struct nft_set *set,
4805 const struct nft_set_ext_tmpl *tmpl,
4806 const u32 *key, const u32 *key_end,
4807 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
4809 struct nft_set_ext *ext;
4812 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
4816 ext = nft_set_elem_ext(set, elem);
4817 nft_set_ext_init(ext, tmpl);
4819 memcpy(nft_set_ext_key(ext), key, set->klen);
4820 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
4821 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
4822 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4823 memcpy(nft_set_ext_data(ext), data, set->dlen);
4824 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4825 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
4826 if (expiration == 0)
4827 *nft_set_ext_expiration(ext) += timeout;
4829 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
4830 *nft_set_ext_timeout(ext) = timeout;
4835 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
4838 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4839 struct nft_ctx ctx = {
4840 .net = read_pnet(&set->net),
4841 .family = set->table->family,
4844 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
4845 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4846 nft_data_release(nft_set_ext_data(ext), set->dtype);
4847 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) {
4848 struct nft_expr *expr = nft_set_ext_expr(ext);
4850 if (expr->ops->destroy_clone) {
4851 expr->ops->destroy_clone(&ctx, expr);
4852 module_put(expr->ops->type->owner);
4854 nf_tables_expr_destroy(&ctx, expr);
4857 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4858 (*nft_set_ext_obj(ext))->use--;
4861 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
4863 /* Only called from commit path, nft_set_elem_deactivate() already deals with
4864 * the refcounting from the preparation phase.
4866 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
4867 const struct nft_set *set, void *elem)
4869 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4871 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
4872 nf_tables_expr_destroy(ctx, nft_set_ext_expr(ext));
4876 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4877 const struct nlattr *attr, u32 nlmsg_flags)
4879 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4880 u8 genmask = nft_genmask_next(ctx->net);
4881 struct nft_set_ext_tmpl tmpl;
4882 struct nft_set_ext *ext, *ext2;
4883 struct nft_set_elem elem;
4884 struct nft_set_binding *binding;
4885 struct nft_object *obj = NULL;
4886 struct nft_userdata *udata;
4887 struct nft_data_desc desc;
4888 struct nft_data data;
4889 enum nft_registers dreg;
4890 struct nft_trans *trans;
4897 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4898 nft_set_elem_policy, NULL);
4902 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4905 nft_set_ext_prepare(&tmpl);
4907 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4911 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4913 if (set->flags & NFT_SET_MAP) {
4914 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
4915 !(flags & NFT_SET_ELEM_INTERVAL_END))
4918 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4922 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
4923 (nla[NFTA_SET_ELEM_DATA] ||
4924 nla[NFTA_SET_ELEM_OBJREF] ||
4925 nla[NFTA_SET_ELEM_TIMEOUT] ||
4926 nla[NFTA_SET_ELEM_EXPIRATION] ||
4927 nla[NFTA_SET_ELEM_USERDATA] ||
4928 nla[NFTA_SET_ELEM_EXPR]))
4932 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
4933 if (!(set->flags & NFT_SET_TIMEOUT))
4935 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
4939 } else if (set->flags & NFT_SET_TIMEOUT) {
4940 timeout = set->timeout;
4944 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
4945 if (!(set->flags & NFT_SET_TIMEOUT))
4947 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
4953 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
4954 nla[NFTA_SET_ELEM_KEY]);
4958 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
4960 if (nla[NFTA_SET_ELEM_KEY_END]) {
4961 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
4962 nla[NFTA_SET_ELEM_KEY_END]);
4966 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
4970 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
4971 if (timeout != set->timeout)
4972 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
4975 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
4976 if (!(set->flags & NFT_SET_OBJECT)) {
4978 goto err_parse_key_end;
4980 obj = nft_obj_lookup(ctx->net, ctx->table,
4981 nla[NFTA_SET_ELEM_OBJREF],
4982 set->objtype, genmask);
4985 goto err_parse_key_end;
4987 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
4990 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
4991 err = nft_data_init(ctx, &data, sizeof(data), &desc,
4992 nla[NFTA_SET_ELEM_DATA]);
4994 goto err_parse_key_end;
4997 if (set->dtype != NFT_DATA_VERDICT && desc.len != set->dlen)
4998 goto err_parse_data;
5000 dreg = nft_type_to_reg(set->dtype);
5001 list_for_each_entry(binding, &set->bindings, list) {
5002 struct nft_ctx bind_ctx = {
5004 .family = ctx->family,
5005 .table = ctx->table,
5006 .chain = (struct nft_chain *)binding->chain,
5009 if (!(binding->flags & NFT_SET_MAP))
5012 err = nft_validate_register_store(&bind_ctx, dreg,
5014 desc.type, desc.len);
5016 goto err_parse_data;
5018 if (desc.type == NFT_DATA_VERDICT &&
5019 (data.verdict.code == NFT_GOTO ||
5020 data.verdict.code == NFT_JUMP))
5021 nft_validate_state_update(ctx->net,
5025 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
5028 /* The full maximum length of userdata can exceed the maximum
5029 * offset value (U8_MAX) for following extensions, therefor it
5030 * must be the last extension added.
5033 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5034 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5036 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5041 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5042 elem.key_end.val.data, data.data,
5043 timeout, expiration, GFP_KERNEL);
5044 if (elem.priv == NULL)
5045 goto err_parse_data;
5047 ext = nft_set_elem_ext(set, elem.priv);
5049 *nft_set_ext_flags(ext) = flags;
5051 udata = nft_set_ext_userdata(ext);
5052 udata->len = ulen - 1;
5053 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5056 *nft_set_ext_obj(ext) = obj;
5060 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5064 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
5065 err = set->ops->insert(ctx->net, set, &elem, &ext2);
5067 if (err == -EEXIST) {
5068 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5069 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5070 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
5071 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
5073 goto err_element_clash;
5075 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5076 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5077 memcmp(nft_set_ext_data(ext),
5078 nft_set_ext_data(ext2), set->dlen) != 0) ||
5079 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5080 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5081 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
5083 else if (!(nlmsg_flags & NLM_F_EXCL))
5085 } else if (err == -ENOTEMPTY) {
5086 /* ENOTEMPTY reports overlapping between this element
5087 * and an existing one.
5091 goto err_element_clash;
5095 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5100 nft_trans_elem(trans) = elem;
5101 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5105 set->ops->remove(ctx->net, set, &elem);
5113 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5114 nft_data_release(&data, desc.type);
5116 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
5118 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5123 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
5124 struct sk_buff *skb, const struct nlmsghdr *nlh,
5125 const struct nlattr * const nla[],
5126 struct netlink_ext_ack *extack)
5128 u8 genmask = nft_genmask_next(net);
5129 const struct nlattr *attr;
5130 struct nft_set *set;
5134 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
5137 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5142 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
5143 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
5145 return PTR_ERR(set);
5147 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5150 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5151 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
5156 if (net->nft.validate_state == NFT_VALIDATE_DO)
5157 return nft_table_validate(net, ctx.table);
5163 * nft_data_hold - hold a nft_data item
5165 * @data: struct nft_data to release
5166 * @type: type of data
5168 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5169 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
5170 * NFT_GOTO verdicts. This function must be called on active data objects
5171 * from the second phase of the commit protocol.
5173 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
5175 if (type == NFT_DATA_VERDICT) {
5176 switch (data->verdict.code) {
5179 data->verdict.chain->use++;
5185 static void nft_set_elem_activate(const struct net *net,
5186 const struct nft_set *set,
5187 struct nft_set_elem *elem)
5189 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5191 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5192 nft_data_hold(nft_set_ext_data(ext), set->dtype);
5193 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5194 (*nft_set_ext_obj(ext))->use++;
5197 static void nft_set_elem_deactivate(const struct net *net,
5198 const struct nft_set *set,
5199 struct nft_set_elem *elem)
5201 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5203 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5204 nft_data_release(nft_set_ext_data(ext), set->dtype);
5205 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5206 (*nft_set_ext_obj(ext))->use--;
5209 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
5210 const struct nlattr *attr)
5212 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5213 struct nft_set_ext_tmpl tmpl;
5214 struct nft_set_elem elem;
5215 struct nft_set_ext *ext;
5216 struct nft_trans *trans;
5221 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5222 nft_set_elem_policy, NULL);
5226 if (nla[NFTA_SET_ELEM_KEY] == NULL)
5229 nft_set_ext_prepare(&tmpl);
5231 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5235 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5237 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5238 nla[NFTA_SET_ELEM_KEY]);
5242 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5244 if (nla[NFTA_SET_ELEM_KEY_END]) {
5245 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5246 nla[NFTA_SET_ELEM_KEY_END]);
5250 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5254 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5255 elem.key_end.val.data, NULL, 0, 0,
5257 if (elem.priv == NULL)
5260 ext = nft_set_elem_ext(set, elem.priv);
5262 *nft_set_ext_flags(ext) = flags;
5264 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
5268 priv = set->ops->deactivate(ctx->net, set, &elem);
5276 nft_set_elem_deactivate(ctx->net, set, &elem);
5278 nft_trans_elem(trans) = elem;
5279 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5287 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5291 static int nft_flush_set(const struct nft_ctx *ctx,
5292 struct nft_set *set,
5293 const struct nft_set_iter *iter,
5294 struct nft_set_elem *elem)
5296 struct nft_trans *trans;
5299 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
5300 sizeof(struct nft_trans_elem), GFP_ATOMIC);
5304 if (!set->ops->flush(ctx->net, set, elem->priv)) {
5310 nft_set_elem_deactivate(ctx->net, set, elem);
5311 nft_trans_elem_set(trans) = set;
5312 nft_trans_elem(trans) = *elem;
5313 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5321 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
5322 struct sk_buff *skb, const struct nlmsghdr *nlh,
5323 const struct nlattr * const nla[],
5324 struct netlink_ext_ack *extack)
5326 u8 genmask = nft_genmask_next(net);
5327 const struct nlattr *attr;
5328 struct nft_set *set;
5332 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5337 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5339 return PTR_ERR(set);
5340 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5343 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
5344 struct nft_set_iter iter = {
5346 .fn = nft_flush_set,
5348 set->ops->walk(&ctx, set, &iter);
5353 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5354 err = nft_del_setelem(&ctx, set, attr);
5363 void nft_set_gc_batch_release(struct rcu_head *rcu)
5365 struct nft_set_gc_batch *gcb;
5368 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
5369 for (i = 0; i < gcb->head.cnt; i++)
5370 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
5373 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
5375 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
5378 struct nft_set_gc_batch *gcb;
5380 gcb = kzalloc(sizeof(*gcb), gfp);
5383 gcb->head.set = set;
5386 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
5393 * nft_register_obj- register nf_tables stateful object type
5396 * Registers the object type for use with nf_tables. Returns zero on
5397 * success or a negative errno code otherwise.
5399 int nft_register_obj(struct nft_object_type *obj_type)
5401 if (obj_type->type == NFT_OBJECT_UNSPEC)
5404 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5405 list_add_rcu(&obj_type->list, &nf_tables_objects);
5406 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5409 EXPORT_SYMBOL_GPL(nft_register_obj);
5412 * nft_unregister_obj - unregister nf_tables object type
5415 * Unregisters the object type for use with nf_tables.
5417 void nft_unregister_obj(struct nft_object_type *obj_type)
5419 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5420 list_del_rcu(&obj_type->list);
5421 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5423 EXPORT_SYMBOL_GPL(nft_unregister_obj);
5425 struct nft_object *nft_obj_lookup(const struct net *net,
5426 const struct nft_table *table,
5427 const struct nlattr *nla, u32 objtype,
5430 struct nft_object_hash_key k = { .table = table };
5431 char search[NFT_OBJ_MAXNAMELEN];
5432 struct rhlist_head *tmp, *list;
5433 struct nft_object *obj;
5435 nla_strlcpy(search, nla, sizeof(search));
5438 WARN_ON_ONCE(!rcu_read_lock_held() &&
5439 !lockdep_commit_lock_is_held(net));
5442 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
5446 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
5447 if (objtype == obj->ops->type->type &&
5448 nft_active_genmask(obj, genmask)) {
5455 return ERR_PTR(-ENOENT);
5457 EXPORT_SYMBOL_GPL(nft_obj_lookup);
5459 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
5460 const struct nlattr *nla,
5461 u32 objtype, u8 genmask)
5463 struct nft_object *obj;
5465 list_for_each_entry(obj, &table->objects, list) {
5466 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
5467 objtype == obj->ops->type->type &&
5468 nft_active_genmask(obj, genmask))
5471 return ERR_PTR(-ENOENT);
5474 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
5475 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
5476 .len = NFT_TABLE_MAXNAMELEN - 1 },
5477 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
5478 .len = NFT_OBJ_MAXNAMELEN - 1 },
5479 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
5480 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
5481 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
5484 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
5485 const struct nft_object_type *type,
5486 const struct nlattr *attr)
5489 const struct nft_object_ops *ops;
5490 struct nft_object *obj;
5493 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
5498 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
5499 type->policy, NULL);
5503 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
5506 if (type->select_ops) {
5507 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
5517 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
5521 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
5534 return ERR_PTR(err);
5537 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
5538 struct nft_object *obj, bool reset)
5540 struct nlattr *nest;
5542 nest = nla_nest_start_noflag(skb, attr);
5544 goto nla_put_failure;
5545 if (obj->ops->dump(skb, obj, reset) < 0)
5546 goto nla_put_failure;
5547 nla_nest_end(skb, nest);
5554 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
5556 const struct nft_object_type *type;
5558 list_for_each_entry(type, &nf_tables_objects, list) {
5559 if (objtype == type->type)
5565 static const struct nft_object_type *
5566 nft_obj_type_get(struct net *net, u32 objtype)
5568 const struct nft_object_type *type;
5570 type = __nft_obj_type_get(objtype);
5571 if (type != NULL && try_module_get(type->owner))
5574 lockdep_nfnl_nft_mutex_not_held();
5575 #ifdef CONFIG_MODULES
5577 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
5578 return ERR_PTR(-EAGAIN);
5581 return ERR_PTR(-ENOENT);
5584 static int nf_tables_updobj(const struct nft_ctx *ctx,
5585 const struct nft_object_type *type,
5586 const struct nlattr *attr,
5587 struct nft_object *obj)
5589 struct nft_object *newobj;
5590 struct nft_trans *trans;
5593 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
5594 sizeof(struct nft_trans_obj));
5598 newobj = nft_obj_init(ctx, type, attr);
5599 if (IS_ERR(newobj)) {
5600 err = PTR_ERR(newobj);
5601 goto err_free_trans;
5604 nft_trans_obj(trans) = obj;
5605 nft_trans_obj_update(trans) = true;
5606 nft_trans_obj_newobj(trans) = newobj;
5607 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5616 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
5617 struct sk_buff *skb, const struct nlmsghdr *nlh,
5618 const struct nlattr * const nla[],
5619 struct netlink_ext_ack *extack)
5621 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5622 const struct nft_object_type *type;
5623 u8 genmask = nft_genmask_next(net);
5624 int family = nfmsg->nfgen_family;
5625 struct nft_table *table;
5626 struct nft_object *obj;
5631 if (!nla[NFTA_OBJ_TYPE] ||
5632 !nla[NFTA_OBJ_NAME] ||
5633 !nla[NFTA_OBJ_DATA])
5636 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5637 if (IS_ERR(table)) {
5638 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5639 return PTR_ERR(table);
5642 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5643 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
5646 if (err != -ENOENT) {
5647 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5651 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5652 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5655 if (nlh->nlmsg_flags & NLM_F_REPLACE)
5658 type = __nft_obj_type_get(objtype);
5659 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5661 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
5664 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5666 type = nft_obj_type_get(net, objtype);
5668 return PTR_ERR(type);
5670 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
5675 obj->key.table = table;
5676 obj->handle = nf_tables_alloc_handle(table);
5678 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
5679 if (!obj->key.name) {
5684 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
5688 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
5689 nft_objname_ht_params);
5693 list_add_tail_rcu(&obj->list, &table->objects);
5697 /* queued in transaction log */
5698 INIT_LIST_HEAD(&obj->list);
5701 kfree(obj->key.name);
5703 if (obj->ops->destroy)
5704 obj->ops->destroy(&ctx, obj);
5707 module_put(type->owner);
5711 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
5712 u32 portid, u32 seq, int event, u32 flags,
5713 int family, const struct nft_table *table,
5714 struct nft_object *obj, bool reset)
5716 struct nfgenmsg *nfmsg;
5717 struct nlmsghdr *nlh;
5719 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5720 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5722 goto nla_put_failure;
5724 nfmsg = nlmsg_data(nlh);
5725 nfmsg->nfgen_family = family;
5726 nfmsg->version = NFNETLINK_V0;
5727 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5729 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
5730 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
5731 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
5732 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
5733 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
5734 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
5736 goto nla_put_failure;
5738 nlmsg_end(skb, nlh);
5742 nlmsg_trim(skb, nlh);
5746 struct nft_obj_filter {
5751 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
5753 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5754 const struct nft_table *table;
5755 unsigned int idx = 0, s_idx = cb->args[0];
5756 struct nft_obj_filter *filter = cb->data;
5757 struct net *net = sock_net(skb->sk);
5758 int family = nfmsg->nfgen_family;
5759 struct nft_object *obj;
5762 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5766 cb->seq = net->nft.base_seq;
5768 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5769 if (family != NFPROTO_UNSPEC && family != table->family)
5772 list_for_each_entry_rcu(obj, &table->objects, list) {
5773 if (!nft_is_active(net, obj))
5778 memset(&cb->args[1], 0,
5779 sizeof(cb->args) - sizeof(cb->args[0]));
5780 if (filter && filter->table &&
5781 strcmp(filter->table, table->name))
5784 filter->type != NFT_OBJECT_UNSPEC &&
5785 obj->ops->type->type != filter->type)
5788 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
5791 NLM_F_MULTI | NLM_F_APPEND,
5792 table->family, table,
5796 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5808 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
5810 const struct nlattr * const *nla = cb->data;
5811 struct nft_obj_filter *filter = NULL;
5813 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
5814 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5818 if (nla[NFTA_OBJ_TABLE]) {
5819 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
5820 if (!filter->table) {
5826 if (nla[NFTA_OBJ_TYPE])
5827 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5834 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
5836 struct nft_obj_filter *filter = cb->data;
5839 kfree(filter->table);
5846 /* called with rcu_read_lock held */
5847 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
5848 struct sk_buff *skb, const struct nlmsghdr *nlh,
5849 const struct nlattr * const nla[],
5850 struct netlink_ext_ack *extack)
5852 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5853 u8 genmask = nft_genmask_cur(net);
5854 int family = nfmsg->nfgen_family;
5855 const struct nft_table *table;
5856 struct nft_object *obj;
5857 struct sk_buff *skb2;
5862 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5863 struct netlink_dump_control c = {
5864 .start = nf_tables_dump_obj_start,
5865 .dump = nf_tables_dump_obj,
5866 .done = nf_tables_dump_obj_done,
5867 .module = THIS_MODULE,
5868 .data = (void *)nla,
5871 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5874 if (!nla[NFTA_OBJ_NAME] ||
5875 !nla[NFTA_OBJ_TYPE])
5878 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5879 if (IS_ERR(table)) {
5880 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5881 return PTR_ERR(table);
5884 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5885 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
5887 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5888 return PTR_ERR(obj);
5891 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5895 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5898 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
5899 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
5900 family, table, obj, reset);
5904 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5910 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
5912 if (obj->ops->destroy)
5913 obj->ops->destroy(ctx, obj);
5915 module_put(obj->ops->type->owner);
5916 kfree(obj->key.name);
5920 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
5921 struct sk_buff *skb, const struct nlmsghdr *nlh,
5922 const struct nlattr * const nla[],
5923 struct netlink_ext_ack *extack)
5925 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5926 u8 genmask = nft_genmask_next(net);
5927 int family = nfmsg->nfgen_family;
5928 const struct nlattr *attr;
5929 struct nft_table *table;
5930 struct nft_object *obj;
5934 if (!nla[NFTA_OBJ_TYPE] ||
5935 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
5938 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5939 if (IS_ERR(table)) {
5940 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5941 return PTR_ERR(table);
5944 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5945 if (nla[NFTA_OBJ_HANDLE]) {
5946 attr = nla[NFTA_OBJ_HANDLE];
5947 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
5949 attr = nla[NFTA_OBJ_NAME];
5950 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
5954 NL_SET_BAD_ATTR(extack, attr);
5955 return PTR_ERR(obj);
5958 NL_SET_BAD_ATTR(extack, attr);
5962 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5964 return nft_delobj(&ctx, obj);
5967 void nft_obj_notify(struct net *net, const struct nft_table *table,
5968 struct nft_object *obj, u32 portid, u32 seq, int event,
5969 int family, int report, gfp_t gfp)
5971 struct sk_buff *skb;
5975 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5978 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
5982 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
5989 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
5992 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5994 EXPORT_SYMBOL_GPL(nft_obj_notify);
5996 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
5997 struct nft_object *obj, int event)
5999 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
6000 ctx->family, ctx->report, GFP_KERNEL);
6006 void nft_register_flowtable_type(struct nf_flowtable_type *type)
6008 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6009 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
6010 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6012 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
6014 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
6016 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6017 list_del_rcu(&type->list);
6018 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6020 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
6022 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
6023 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
6024 .len = NFT_NAME_MAXLEN - 1 },
6025 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
6026 .len = NFT_NAME_MAXLEN - 1 },
6027 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
6028 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
6029 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
6032 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
6033 const struct nlattr *nla, u8 genmask)
6035 struct nft_flowtable *flowtable;
6037 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6038 if (!nla_strcmp(nla, flowtable->name) &&
6039 nft_active_genmask(flowtable, genmask))
6042 return ERR_PTR(-ENOENT);
6044 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
6046 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
6047 struct nft_flowtable *flowtable,
6048 enum nft_trans_phase phase)
6051 case NFT_TRANS_PREPARE:
6052 case NFT_TRANS_ABORT:
6053 case NFT_TRANS_RELEASE:
6060 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
6062 static struct nft_flowtable *
6063 nft_flowtable_lookup_byhandle(const struct nft_table *table,
6064 const struct nlattr *nla, u8 genmask)
6066 struct nft_flowtable *flowtable;
6068 list_for_each_entry(flowtable, &table->flowtables, list) {
6069 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
6070 nft_active_genmask(flowtable, genmask))
6073 return ERR_PTR(-ENOENT);
6076 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
6077 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
6078 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
6079 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
6082 static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx,
6083 const struct nlattr *attr,
6084 struct nft_flowtable *flowtable)
6086 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
6087 struct nft_hook *hook;
6088 int hooknum, priority;
6091 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
6092 nft_flowtable_hook_policy, NULL);
6096 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
6097 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] ||
6098 !tb[NFTA_FLOWTABLE_HOOK_DEVS])
6101 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6102 if (hooknum != NF_NETDEV_INGRESS)
6105 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6107 err = nf_tables_parse_netdev_hooks(ctx->net,
6108 tb[NFTA_FLOWTABLE_HOOK_DEVS],
6109 &flowtable->hook_list);
6113 flowtable->hooknum = hooknum;
6114 flowtable->data.priority = priority;
6116 list_for_each_entry(hook, &flowtable->hook_list, list) {
6117 hook->ops.pf = NFPROTO_NETDEV;
6118 hook->ops.hooknum = hooknum;
6119 hook->ops.priority = priority;
6120 hook->ops.priv = &flowtable->data;
6121 hook->ops.hook = flowtable->data.type->hook;
6127 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
6129 const struct nf_flowtable_type *type;
6131 list_for_each_entry(type, &nf_tables_flowtables, list) {
6132 if (family == type->family)
6138 static const struct nf_flowtable_type *
6139 nft_flowtable_type_get(struct net *net, u8 family)
6141 const struct nf_flowtable_type *type;
6143 type = __nft_flowtable_type_get(family);
6144 if (type != NULL && try_module_get(type->owner))
6147 lockdep_nfnl_nft_mutex_not_held();
6148 #ifdef CONFIG_MODULES
6150 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
6151 return ERR_PTR(-EAGAIN);
6154 return ERR_PTR(-ENOENT);
6157 /* Only called from error and netdev event paths. */
6158 static void nft_unregister_flowtable_hook(struct net *net,
6159 struct nft_flowtable *flowtable,
6160 struct nft_hook *hook)
6162 nf_unregister_net_hook(net, &hook->ops);
6163 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
6167 static void nft_unregister_flowtable_net_hooks(struct net *net,
6168 struct nft_flowtable *flowtable)
6170 struct nft_hook *hook;
6172 list_for_each_entry(hook, &flowtable->hook_list, list)
6173 nf_unregister_net_hook(net, &hook->ops);
6176 static int nft_register_flowtable_net_hooks(struct net *net,
6177 struct nft_table *table,
6178 struct nft_flowtable *flowtable)
6180 struct nft_hook *hook, *hook2, *next;
6181 struct nft_flowtable *ft;
6184 list_for_each_entry(hook, &flowtable->hook_list, list) {
6185 list_for_each_entry(ft, &table->flowtables, list) {
6186 list_for_each_entry(hook2, &ft->hook_list, list) {
6187 if (hook->ops.dev == hook2->ops.dev &&
6188 hook->ops.pf == hook2->ops.pf) {
6190 goto err_unregister_net_hooks;
6195 err = flowtable->data.type->setup(&flowtable->data,
6199 goto err_unregister_net_hooks;
6201 err = nf_register_net_hook(net, &hook->ops);
6203 flowtable->data.type->setup(&flowtable->data,
6206 goto err_unregister_net_hooks;
6214 err_unregister_net_hooks:
6215 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
6219 nft_unregister_flowtable_hook(net, flowtable, hook);
6220 list_del_rcu(&hook->list);
6221 kfree_rcu(hook, rcu);
6227 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
6228 struct sk_buff *skb,
6229 const struct nlmsghdr *nlh,
6230 const struct nlattr * const nla[],
6231 struct netlink_ext_ack *extack)
6233 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6234 const struct nf_flowtable_type *type;
6235 u8 genmask = nft_genmask_next(net);
6236 int family = nfmsg->nfgen_family;
6237 struct nft_flowtable *flowtable;
6238 struct nft_hook *hook, *next;
6239 struct nft_table *table;
6243 if (!nla[NFTA_FLOWTABLE_TABLE] ||
6244 !nla[NFTA_FLOWTABLE_NAME] ||
6245 !nla[NFTA_FLOWTABLE_HOOK])
6248 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6250 if (IS_ERR(table)) {
6251 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6252 return PTR_ERR(table);
6255 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6257 if (IS_ERR(flowtable)) {
6258 err = PTR_ERR(flowtable);
6259 if (err != -ENOENT) {
6260 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6264 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6265 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6272 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6274 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
6278 flowtable->table = table;
6279 flowtable->handle = nf_tables_alloc_handle(table);
6280 INIT_LIST_HEAD(&flowtable->hook_list);
6282 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
6283 if (!flowtable->name) {
6288 type = nft_flowtable_type_get(net, family);
6290 err = PTR_ERR(type);
6294 if (nla[NFTA_FLOWTABLE_FLAGS]) {
6295 flowtable->data.flags =
6296 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
6297 if (flowtable->data.flags & ~NF_FLOWTABLE_HW_OFFLOAD)
6301 write_pnet(&flowtable->data.net, net);
6302 flowtable->data.type = type;
6303 err = type->init(&flowtable->data);
6307 err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
6312 err = nft_register_flowtable_net_hooks(ctx.net, table, flowtable);
6314 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
6315 list_del_rcu(&hook->list);
6316 kfree_rcu(hook, rcu);
6321 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
6325 list_add_tail_rcu(&flowtable->list, &table->flowtables);
6330 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
6331 nft_unregister_flowtable_hook(net, flowtable, hook);
6332 list_del_rcu(&hook->list);
6333 kfree_rcu(hook, rcu);
6336 flowtable->data.type->free(&flowtable->data);
6338 module_put(type->owner);
6340 kfree(flowtable->name);
6346 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
6347 struct sk_buff *skb,
6348 const struct nlmsghdr *nlh,
6349 const struct nlattr * const nla[],
6350 struct netlink_ext_ack *extack)
6352 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6353 u8 genmask = nft_genmask_next(net);
6354 int family = nfmsg->nfgen_family;
6355 struct nft_flowtable *flowtable;
6356 const struct nlattr *attr;
6357 struct nft_table *table;
6360 if (!nla[NFTA_FLOWTABLE_TABLE] ||
6361 (!nla[NFTA_FLOWTABLE_NAME] &&
6362 !nla[NFTA_FLOWTABLE_HANDLE]))
6365 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6367 if (IS_ERR(table)) {
6368 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6369 return PTR_ERR(table);
6372 if (nla[NFTA_FLOWTABLE_HANDLE]) {
6373 attr = nla[NFTA_FLOWTABLE_HANDLE];
6374 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
6376 attr = nla[NFTA_FLOWTABLE_NAME];
6377 flowtable = nft_flowtable_lookup(table, attr, genmask);
6380 if (IS_ERR(flowtable)) {
6381 NL_SET_BAD_ATTR(extack, attr);
6382 return PTR_ERR(flowtable);
6384 if (flowtable->use > 0) {
6385 NL_SET_BAD_ATTR(extack, attr);
6389 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6391 return nft_delflowtable(&ctx, flowtable);
6394 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
6395 u32 portid, u32 seq, int event,
6396 u32 flags, int family,
6397 struct nft_flowtable *flowtable)
6399 struct nlattr *nest, *nest_devs;
6400 struct nfgenmsg *nfmsg;
6401 struct nft_hook *hook;
6402 struct nlmsghdr *nlh;
6404 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6405 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
6407 goto nla_put_failure;
6409 nfmsg = nlmsg_data(nlh);
6410 nfmsg->nfgen_family = family;
6411 nfmsg->version = NFNETLINK_V0;
6412 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
6414 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
6415 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
6416 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
6417 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
6418 NFTA_FLOWTABLE_PAD) ||
6419 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
6420 goto nla_put_failure;
6422 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
6424 goto nla_put_failure;
6425 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
6426 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
6427 goto nla_put_failure;
6429 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
6431 goto nla_put_failure;
6433 list_for_each_entry_rcu(hook, &flowtable->hook_list, list) {
6434 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
6435 goto nla_put_failure;
6437 nla_nest_end(skb, nest_devs);
6438 nla_nest_end(skb, nest);
6440 nlmsg_end(skb, nlh);
6444 nlmsg_trim(skb, nlh);
6448 struct nft_flowtable_filter {
6452 static int nf_tables_dump_flowtable(struct sk_buff *skb,
6453 struct netlink_callback *cb)
6455 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6456 struct nft_flowtable_filter *filter = cb->data;
6457 unsigned int idx = 0, s_idx = cb->args[0];
6458 struct net *net = sock_net(skb->sk);
6459 int family = nfmsg->nfgen_family;
6460 struct nft_flowtable *flowtable;
6461 const struct nft_table *table;
6464 cb->seq = net->nft.base_seq;
6466 list_for_each_entry_rcu(table, &net->nft.tables, list) {
6467 if (family != NFPROTO_UNSPEC && family != table->family)
6470 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6471 if (!nft_is_active(net, flowtable))
6476 memset(&cb->args[1], 0,
6477 sizeof(cb->args) - sizeof(cb->args[0]));
6478 if (filter && filter->table &&
6479 strcmp(filter->table, table->name))
6482 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
6484 NFT_MSG_NEWFLOWTABLE,
6485 NLM_F_MULTI | NLM_F_APPEND,
6486 table->family, flowtable) < 0)
6489 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6501 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
6503 const struct nlattr * const *nla = cb->data;
6504 struct nft_flowtable_filter *filter = NULL;
6506 if (nla[NFTA_FLOWTABLE_TABLE]) {
6507 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6511 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
6513 if (!filter->table) {
6523 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
6525 struct nft_flowtable_filter *filter = cb->data;
6530 kfree(filter->table);
6536 /* called with rcu_read_lock held */
6537 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
6538 struct sk_buff *skb,
6539 const struct nlmsghdr *nlh,
6540 const struct nlattr * const nla[],
6541 struct netlink_ext_ack *extack)
6543 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6544 u8 genmask = nft_genmask_cur(net);
6545 int family = nfmsg->nfgen_family;
6546 struct nft_flowtable *flowtable;
6547 const struct nft_table *table;
6548 struct sk_buff *skb2;
6551 if (nlh->nlmsg_flags & NLM_F_DUMP) {
6552 struct netlink_dump_control c = {
6553 .start = nf_tables_dump_flowtable_start,
6554 .dump = nf_tables_dump_flowtable,
6555 .done = nf_tables_dump_flowtable_done,
6556 .module = THIS_MODULE,
6557 .data = (void *)nla,
6560 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
6563 if (!nla[NFTA_FLOWTABLE_NAME])
6566 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6569 return PTR_ERR(table);
6571 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6573 if (IS_ERR(flowtable))
6574 return PTR_ERR(flowtable);
6576 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6580 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
6582 NFT_MSG_NEWFLOWTABLE, 0, family,
6587 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
6593 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
6594 struct nft_flowtable *flowtable,
6597 struct sk_buff *skb;
6601 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
6604 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6608 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
6610 ctx->family, flowtable);
6616 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
6617 ctx->report, GFP_KERNEL);
6620 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
6623 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
6625 struct nft_hook *hook, *next;
6627 flowtable->data.type->free(&flowtable->data);
6628 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
6629 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
6631 list_del_rcu(&hook->list);
6634 kfree(flowtable->name);
6635 module_put(flowtable->data.type->owner);
6639 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
6640 u32 portid, u32 seq)
6642 struct nlmsghdr *nlh;
6643 struct nfgenmsg *nfmsg;
6644 char buf[TASK_COMM_LEN];
6645 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
6647 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
6649 goto nla_put_failure;
6651 nfmsg = nlmsg_data(nlh);
6652 nfmsg->nfgen_family = AF_UNSPEC;
6653 nfmsg->version = NFNETLINK_V0;
6654 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
6656 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
6657 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
6658 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
6659 goto nla_put_failure;
6661 nlmsg_end(skb, nlh);
6665 nlmsg_trim(skb, nlh);
6669 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
6670 struct nft_flowtable *flowtable)
6672 struct nft_hook *hook;
6674 list_for_each_entry(hook, &flowtable->hook_list, list) {
6675 if (hook->ops.dev != dev)
6678 /* flow_offload_netdev_event() cleans up entries for us. */
6679 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
6680 list_del_rcu(&hook->list);
6681 kfree_rcu(hook, rcu);
6686 static int nf_tables_flowtable_event(struct notifier_block *this,
6687 unsigned long event, void *ptr)
6689 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
6690 struct nft_flowtable *flowtable;
6691 struct nft_table *table;
6694 if (event != NETDEV_UNREGISTER)
6698 mutex_lock(&net->nft.commit_mutex);
6699 list_for_each_entry(table, &net->nft.tables, list) {
6700 list_for_each_entry(flowtable, &table->flowtables, list) {
6701 nft_flowtable_event(event, dev, flowtable);
6704 mutex_unlock(&net->nft.commit_mutex);
6709 static struct notifier_block nf_tables_flowtable_notifier = {
6710 .notifier_call = nf_tables_flowtable_event,
6713 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
6716 struct nlmsghdr *nlh = nlmsg_hdr(skb);
6717 struct sk_buff *skb2;
6720 if (nlmsg_report(nlh) &&
6721 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6724 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6728 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6735 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6736 nlmsg_report(nlh), GFP_KERNEL);
6739 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6743 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
6744 struct sk_buff *skb, const struct nlmsghdr *nlh,
6745 const struct nlattr * const nla[],
6746 struct netlink_ext_ack *extack)
6748 struct sk_buff *skb2;
6751 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6755 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6760 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
6766 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
6767 [NFT_MSG_NEWTABLE] = {
6768 .call_batch = nf_tables_newtable,
6769 .attr_count = NFTA_TABLE_MAX,
6770 .policy = nft_table_policy,
6772 [NFT_MSG_GETTABLE] = {
6773 .call_rcu = nf_tables_gettable,
6774 .attr_count = NFTA_TABLE_MAX,
6775 .policy = nft_table_policy,
6777 [NFT_MSG_DELTABLE] = {
6778 .call_batch = nf_tables_deltable,
6779 .attr_count = NFTA_TABLE_MAX,
6780 .policy = nft_table_policy,
6782 [NFT_MSG_NEWCHAIN] = {
6783 .call_batch = nf_tables_newchain,
6784 .attr_count = NFTA_CHAIN_MAX,
6785 .policy = nft_chain_policy,
6787 [NFT_MSG_GETCHAIN] = {
6788 .call_rcu = nf_tables_getchain,
6789 .attr_count = NFTA_CHAIN_MAX,
6790 .policy = nft_chain_policy,
6792 [NFT_MSG_DELCHAIN] = {
6793 .call_batch = nf_tables_delchain,
6794 .attr_count = NFTA_CHAIN_MAX,
6795 .policy = nft_chain_policy,
6797 [NFT_MSG_NEWRULE] = {
6798 .call_batch = nf_tables_newrule,
6799 .attr_count = NFTA_RULE_MAX,
6800 .policy = nft_rule_policy,
6802 [NFT_MSG_GETRULE] = {
6803 .call_rcu = nf_tables_getrule,
6804 .attr_count = NFTA_RULE_MAX,
6805 .policy = nft_rule_policy,
6807 [NFT_MSG_DELRULE] = {
6808 .call_batch = nf_tables_delrule,
6809 .attr_count = NFTA_RULE_MAX,
6810 .policy = nft_rule_policy,
6812 [NFT_MSG_NEWSET] = {
6813 .call_batch = nf_tables_newset,
6814 .attr_count = NFTA_SET_MAX,
6815 .policy = nft_set_policy,
6817 [NFT_MSG_GETSET] = {
6818 .call_rcu = nf_tables_getset,
6819 .attr_count = NFTA_SET_MAX,
6820 .policy = nft_set_policy,
6822 [NFT_MSG_DELSET] = {
6823 .call_batch = nf_tables_delset,
6824 .attr_count = NFTA_SET_MAX,
6825 .policy = nft_set_policy,
6827 [NFT_MSG_NEWSETELEM] = {
6828 .call_batch = nf_tables_newsetelem,
6829 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6830 .policy = nft_set_elem_list_policy,
6832 [NFT_MSG_GETSETELEM] = {
6833 .call_rcu = nf_tables_getsetelem,
6834 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6835 .policy = nft_set_elem_list_policy,
6837 [NFT_MSG_DELSETELEM] = {
6838 .call_batch = nf_tables_delsetelem,
6839 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6840 .policy = nft_set_elem_list_policy,
6842 [NFT_MSG_GETGEN] = {
6843 .call_rcu = nf_tables_getgen,
6845 [NFT_MSG_NEWOBJ] = {
6846 .call_batch = nf_tables_newobj,
6847 .attr_count = NFTA_OBJ_MAX,
6848 .policy = nft_obj_policy,
6850 [NFT_MSG_GETOBJ] = {
6851 .call_rcu = nf_tables_getobj,
6852 .attr_count = NFTA_OBJ_MAX,
6853 .policy = nft_obj_policy,
6855 [NFT_MSG_DELOBJ] = {
6856 .call_batch = nf_tables_delobj,
6857 .attr_count = NFTA_OBJ_MAX,
6858 .policy = nft_obj_policy,
6860 [NFT_MSG_GETOBJ_RESET] = {
6861 .call_rcu = nf_tables_getobj,
6862 .attr_count = NFTA_OBJ_MAX,
6863 .policy = nft_obj_policy,
6865 [NFT_MSG_NEWFLOWTABLE] = {
6866 .call_batch = nf_tables_newflowtable,
6867 .attr_count = NFTA_FLOWTABLE_MAX,
6868 .policy = nft_flowtable_policy,
6870 [NFT_MSG_GETFLOWTABLE] = {
6871 .call_rcu = nf_tables_getflowtable,
6872 .attr_count = NFTA_FLOWTABLE_MAX,
6873 .policy = nft_flowtable_policy,
6875 [NFT_MSG_DELFLOWTABLE] = {
6876 .call_batch = nf_tables_delflowtable,
6877 .attr_count = NFTA_FLOWTABLE_MAX,
6878 .policy = nft_flowtable_policy,
6882 static int nf_tables_validate(struct net *net)
6884 struct nft_table *table;
6886 switch (net->nft.validate_state) {
6887 case NFT_VALIDATE_SKIP:
6889 case NFT_VALIDATE_NEED:
6890 nft_validate_state_update(net, NFT_VALIDATE_DO);
6892 case NFT_VALIDATE_DO:
6893 list_for_each_entry(table, &net->nft.tables, list) {
6894 if (nft_table_validate(net, table) < 0)
6903 /* a drop policy has to be deferred until all rules have been activated,
6904 * otherwise a large ruleset that contains a drop-policy base chain will
6905 * cause all packets to get dropped until the full transaction has been
6908 * We defer the drop policy until the transaction has been finalized.
6910 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
6912 struct nft_base_chain *basechain;
6914 if (nft_trans_chain_policy(trans) != NF_DROP)
6917 if (!nft_is_base_chain(trans->ctx.chain))
6920 basechain = nft_base_chain(trans->ctx.chain);
6921 basechain->policy = NF_DROP;
6924 static void nft_chain_commit_update(struct nft_trans *trans)
6926 struct nft_base_chain *basechain;
6928 if (nft_trans_chain_name(trans)) {
6929 rhltable_remove(&trans->ctx.table->chains_ht,
6930 &trans->ctx.chain->rhlhead,
6931 nft_chain_ht_params);
6932 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
6933 rhltable_insert_key(&trans->ctx.table->chains_ht,
6934 trans->ctx.chain->name,
6935 &trans->ctx.chain->rhlhead,
6936 nft_chain_ht_params);
6939 if (!nft_is_base_chain(trans->ctx.chain))
6942 nft_chain_stats_replace(trans);
6944 basechain = nft_base_chain(trans->ctx.chain);
6946 switch (nft_trans_chain_policy(trans)) {
6949 basechain->policy = nft_trans_chain_policy(trans);
6954 static void nft_obj_commit_update(struct nft_trans *trans)
6956 struct nft_object *newobj;
6957 struct nft_object *obj;
6959 obj = nft_trans_obj(trans);
6960 newobj = nft_trans_obj_newobj(trans);
6962 if (obj->ops->update)
6963 obj->ops->update(obj, newobj);
6968 static void nft_commit_release(struct nft_trans *trans)
6970 switch (trans->msg_type) {
6971 case NFT_MSG_DELTABLE:
6972 nf_tables_table_destroy(&trans->ctx);
6974 case NFT_MSG_NEWCHAIN:
6975 free_percpu(nft_trans_chain_stats(trans));
6976 kfree(nft_trans_chain_name(trans));
6978 case NFT_MSG_DELCHAIN:
6979 nf_tables_chain_destroy(&trans->ctx);
6981 case NFT_MSG_DELRULE:
6982 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6984 case NFT_MSG_DELSET:
6985 nft_set_destroy(nft_trans_set(trans));
6987 case NFT_MSG_DELSETELEM:
6988 nf_tables_set_elem_destroy(&trans->ctx,
6989 nft_trans_elem_set(trans),
6990 nft_trans_elem(trans).priv);
6992 case NFT_MSG_DELOBJ:
6993 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6995 case NFT_MSG_DELFLOWTABLE:
6996 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
7001 put_net(trans->ctx.net);
7006 static void nf_tables_trans_destroy_work(struct work_struct *w)
7008 struct nft_trans *trans, *next;
7011 spin_lock(&nf_tables_destroy_list_lock);
7012 list_splice_init(&nf_tables_destroy_list, &head);
7013 spin_unlock(&nf_tables_destroy_list_lock);
7015 if (list_empty(&head))
7020 list_for_each_entry_safe(trans, next, &head, list) {
7021 list_del(&trans->list);
7022 nft_commit_release(trans);
7026 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
7028 struct nft_rule *rule;
7029 unsigned int alloc = 0;
7032 /* already handled or inactive chain? */
7033 if (chain->rules_next || !nft_is_active_next(net, chain))
7036 rule = list_entry(&chain->rules, struct nft_rule, list);
7039 list_for_each_entry_continue(rule, &chain->rules, list) {
7040 if (nft_is_active_next(net, rule))
7044 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
7045 if (!chain->rules_next)
7048 list_for_each_entry_continue(rule, &chain->rules, list) {
7049 if (nft_is_active_next(net, rule))
7050 chain->rules_next[i++] = rule;
7053 chain->rules_next[i] = NULL;
7057 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
7059 struct nft_trans *trans, *next;
7061 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7062 struct nft_chain *chain = trans->ctx.chain;
7064 if (trans->msg_type == NFT_MSG_NEWRULE ||
7065 trans->msg_type == NFT_MSG_DELRULE) {
7066 kvfree(chain->rules_next);
7067 chain->rules_next = NULL;
7072 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
7074 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
7079 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
7081 struct nft_rule **r = rules;
7082 struct nft_rules_old *old;
7087 r++; /* rcu_head is after end marker */
7091 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
7094 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
7096 struct nft_rule **g0, **g1;
7099 next_genbit = nft_gencursor_next(net);
7101 g0 = rcu_dereference_protected(chain->rules_gen_0,
7102 lockdep_commit_lock_is_held(net));
7103 g1 = rcu_dereference_protected(chain->rules_gen_1,
7104 lockdep_commit_lock_is_held(net));
7106 /* No changes to this chain? */
7107 if (chain->rules_next == NULL) {
7108 /* chain had no change in last or next generation */
7112 * chain had no change in this generation; make sure next
7113 * one uses same rules as current generation.
7116 rcu_assign_pointer(chain->rules_gen_1, g0);
7117 nf_tables_commit_chain_free_rules_old(g1);
7119 rcu_assign_pointer(chain->rules_gen_0, g1);
7120 nf_tables_commit_chain_free_rules_old(g0);
7127 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
7129 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
7131 chain->rules_next = NULL;
7137 nf_tables_commit_chain_free_rules_old(g1);
7139 nf_tables_commit_chain_free_rules_old(g0);
7142 static void nft_obj_del(struct nft_object *obj)
7144 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
7145 list_del_rcu(&obj->list);
7148 static void nft_chain_del(struct nft_chain *chain)
7150 struct nft_table *table = chain->table;
7152 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
7153 nft_chain_ht_params));
7154 list_del_rcu(&chain->list);
7157 static void nf_tables_module_autoload_cleanup(struct net *net)
7159 struct nft_module_request *req, *next;
7161 WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
7162 list_for_each_entry_safe(req, next, &net->nft.module_list, list) {
7163 WARN_ON_ONCE(!req->done);
7164 list_del(&req->list);
7169 static void nf_tables_commit_release(struct net *net)
7171 struct nft_trans *trans;
7173 /* all side effects have to be made visible.
7174 * For example, if a chain named 'foo' has been deleted, a
7175 * new transaction must not find it anymore.
7177 * Memory reclaim happens asynchronously from work queue
7178 * to prevent expensive synchronize_rcu() in commit phase.
7180 if (list_empty(&net->nft.commit_list)) {
7181 nf_tables_module_autoload_cleanup(net);
7182 mutex_unlock(&net->nft.commit_mutex);
7186 trans = list_last_entry(&net->nft.commit_list,
7187 struct nft_trans, list);
7188 get_net(trans->ctx.net);
7189 WARN_ON_ONCE(trans->put_net);
7191 trans->put_net = true;
7192 spin_lock(&nf_tables_destroy_list_lock);
7193 list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
7194 spin_unlock(&nf_tables_destroy_list_lock);
7196 nf_tables_module_autoload_cleanup(net);
7197 mutex_unlock(&net->nft.commit_mutex);
7199 schedule_work(&trans_destroy_work);
7202 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
7204 struct nft_trans *trans, *next;
7205 struct nft_trans_elem *te;
7206 struct nft_chain *chain;
7207 struct nft_table *table;
7210 if (list_empty(&net->nft.commit_list)) {
7211 mutex_unlock(&net->nft.commit_mutex);
7215 /* 0. Validate ruleset, otherwise roll back for error reporting. */
7216 if (nf_tables_validate(net) < 0)
7219 err = nft_flow_rule_offload_commit(net);
7223 /* 1. Allocate space for next generation rules_gen_X[] */
7224 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7227 if (trans->msg_type == NFT_MSG_NEWRULE ||
7228 trans->msg_type == NFT_MSG_DELRULE) {
7229 chain = trans->ctx.chain;
7231 ret = nf_tables_commit_chain_prepare(net, chain);
7233 nf_tables_commit_chain_prepare_cancel(net);
7239 /* step 2. Make rules_gen_X visible to packet path */
7240 list_for_each_entry(table, &net->nft.tables, list) {
7241 list_for_each_entry(chain, &table->chains, list)
7242 nf_tables_commit_chain(net, chain);
7246 * Bump generation counter, invalidate any dump in progress.
7247 * Cannot fail after this point.
7249 while (++net->nft.base_seq == 0);
7251 /* step 3. Start new generation, rules_gen_X now in use. */
7252 net->nft.gencursor = nft_gencursor_next(net);
7254 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7255 switch (trans->msg_type) {
7256 case NFT_MSG_NEWTABLE:
7257 if (nft_trans_table_update(trans)) {
7258 if (!nft_trans_table_enable(trans)) {
7259 nf_tables_table_disable(net,
7261 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
7264 nft_clear(net, trans->ctx.table);
7266 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
7267 nft_trans_destroy(trans);
7269 case NFT_MSG_DELTABLE:
7270 list_del_rcu(&trans->ctx.table->list);
7271 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
7273 case NFT_MSG_NEWCHAIN:
7274 if (nft_trans_chain_update(trans)) {
7275 nft_chain_commit_update(trans);
7276 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
7277 /* trans destroyed after rcu grace period */
7279 nft_chain_commit_drop_policy(trans);
7280 nft_clear(net, trans->ctx.chain);
7281 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
7282 nft_trans_destroy(trans);
7285 case NFT_MSG_DELCHAIN:
7286 nft_chain_del(trans->ctx.chain);
7287 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
7288 nf_tables_unregister_hook(trans->ctx.net,
7292 case NFT_MSG_NEWRULE:
7293 nft_clear(trans->ctx.net, nft_trans_rule(trans));
7294 nf_tables_rule_notify(&trans->ctx,
7295 nft_trans_rule(trans),
7297 nft_trans_destroy(trans);
7299 case NFT_MSG_DELRULE:
7300 list_del_rcu(&nft_trans_rule(trans)->list);
7301 nf_tables_rule_notify(&trans->ctx,
7302 nft_trans_rule(trans),
7304 nft_rule_expr_deactivate(&trans->ctx,
7305 nft_trans_rule(trans),
7308 case NFT_MSG_NEWSET:
7309 nft_clear(net, nft_trans_set(trans));
7310 /* This avoids hitting -EBUSY when deleting the table
7311 * from the transaction.
7313 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
7314 !list_empty(&nft_trans_set(trans)->bindings))
7315 trans->ctx.table->use--;
7317 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
7318 NFT_MSG_NEWSET, GFP_KERNEL);
7319 nft_trans_destroy(trans);
7321 case NFT_MSG_DELSET:
7322 list_del_rcu(&nft_trans_set(trans)->list);
7323 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
7324 NFT_MSG_DELSET, GFP_KERNEL);
7326 case NFT_MSG_NEWSETELEM:
7327 te = (struct nft_trans_elem *)trans->data;
7329 te->set->ops->activate(net, te->set, &te->elem);
7330 nf_tables_setelem_notify(&trans->ctx, te->set,
7332 NFT_MSG_NEWSETELEM, 0);
7333 nft_trans_destroy(trans);
7335 case NFT_MSG_DELSETELEM:
7336 te = (struct nft_trans_elem *)trans->data;
7338 nf_tables_setelem_notify(&trans->ctx, te->set,
7340 NFT_MSG_DELSETELEM, 0);
7341 te->set->ops->remove(net, te->set, &te->elem);
7342 atomic_dec(&te->set->nelems);
7345 case NFT_MSG_NEWOBJ:
7346 if (nft_trans_obj_update(trans)) {
7347 nft_obj_commit_update(trans);
7348 nf_tables_obj_notify(&trans->ctx,
7349 nft_trans_obj(trans),
7352 nft_clear(net, nft_trans_obj(trans));
7353 nf_tables_obj_notify(&trans->ctx,
7354 nft_trans_obj(trans),
7356 nft_trans_destroy(trans);
7359 case NFT_MSG_DELOBJ:
7360 nft_obj_del(nft_trans_obj(trans));
7361 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
7364 case NFT_MSG_NEWFLOWTABLE:
7365 nft_clear(net, nft_trans_flowtable(trans));
7366 nf_tables_flowtable_notify(&trans->ctx,
7367 nft_trans_flowtable(trans),
7368 NFT_MSG_NEWFLOWTABLE);
7369 nft_trans_destroy(trans);
7371 case NFT_MSG_DELFLOWTABLE:
7372 list_del_rcu(&nft_trans_flowtable(trans)->list);
7373 nf_tables_flowtable_notify(&trans->ctx,
7374 nft_trans_flowtable(trans),
7375 NFT_MSG_DELFLOWTABLE);
7376 nft_unregister_flowtable_net_hooks(net,
7377 nft_trans_flowtable(trans));
7382 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
7383 nf_tables_commit_release(net);
7388 static void nf_tables_module_autoload(struct net *net)
7390 struct nft_module_request *req, *next;
7391 LIST_HEAD(module_list);
7393 list_splice_init(&net->nft.module_list, &module_list);
7394 mutex_unlock(&net->nft.commit_mutex);
7395 list_for_each_entry_safe(req, next, &module_list, list) {
7396 request_module("%s", req->module);
7399 mutex_lock(&net->nft.commit_mutex);
7400 list_splice(&module_list, &net->nft.module_list);
7403 static void nf_tables_abort_release(struct nft_trans *trans)
7405 switch (trans->msg_type) {
7406 case NFT_MSG_NEWTABLE:
7407 nf_tables_table_destroy(&trans->ctx);
7409 case NFT_MSG_NEWCHAIN:
7410 nf_tables_chain_destroy(&trans->ctx);
7412 case NFT_MSG_NEWRULE:
7413 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
7415 case NFT_MSG_NEWSET:
7416 nft_set_destroy(nft_trans_set(trans));
7418 case NFT_MSG_NEWSETELEM:
7419 nft_set_elem_destroy(nft_trans_elem_set(trans),
7420 nft_trans_elem(trans).priv, true);
7422 case NFT_MSG_NEWOBJ:
7423 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
7425 case NFT_MSG_NEWFLOWTABLE:
7426 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
7432 static int __nf_tables_abort(struct net *net, bool autoload)
7434 struct nft_trans *trans, *next;
7435 struct nft_trans_elem *te;
7437 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
7439 switch (trans->msg_type) {
7440 case NFT_MSG_NEWTABLE:
7441 if (nft_trans_table_update(trans)) {
7442 if (nft_trans_table_enable(trans)) {
7443 nf_tables_table_disable(net,
7445 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
7447 nft_trans_destroy(trans);
7449 list_del_rcu(&trans->ctx.table->list);
7452 case NFT_MSG_DELTABLE:
7453 nft_clear(trans->ctx.net, trans->ctx.table);
7454 nft_trans_destroy(trans);
7456 case NFT_MSG_NEWCHAIN:
7457 if (nft_trans_chain_update(trans)) {
7458 free_percpu(nft_trans_chain_stats(trans));
7459 kfree(nft_trans_chain_name(trans));
7460 nft_trans_destroy(trans);
7462 trans->ctx.table->use--;
7463 nft_chain_del(trans->ctx.chain);
7464 nf_tables_unregister_hook(trans->ctx.net,
7469 case NFT_MSG_DELCHAIN:
7470 trans->ctx.table->use++;
7471 nft_clear(trans->ctx.net, trans->ctx.chain);
7472 nft_trans_destroy(trans);
7474 case NFT_MSG_NEWRULE:
7475 trans->ctx.chain->use--;
7476 list_del_rcu(&nft_trans_rule(trans)->list);
7477 nft_rule_expr_deactivate(&trans->ctx,
7478 nft_trans_rule(trans),
7481 case NFT_MSG_DELRULE:
7482 trans->ctx.chain->use++;
7483 nft_clear(trans->ctx.net, nft_trans_rule(trans));
7484 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
7485 nft_trans_destroy(trans);
7487 case NFT_MSG_NEWSET:
7488 trans->ctx.table->use--;
7489 if (nft_trans_set_bound(trans)) {
7490 nft_trans_destroy(trans);
7493 list_del_rcu(&nft_trans_set(trans)->list);
7495 case NFT_MSG_DELSET:
7496 trans->ctx.table->use++;
7497 nft_clear(trans->ctx.net, nft_trans_set(trans));
7498 nft_trans_destroy(trans);
7500 case NFT_MSG_NEWSETELEM:
7501 if (nft_trans_elem_set_bound(trans)) {
7502 nft_trans_destroy(trans);
7505 te = (struct nft_trans_elem *)trans->data;
7506 te->set->ops->remove(net, te->set, &te->elem);
7507 atomic_dec(&te->set->nelems);
7509 case NFT_MSG_DELSETELEM:
7510 te = (struct nft_trans_elem *)trans->data;
7512 nft_set_elem_activate(net, te->set, &te->elem);
7513 te->set->ops->activate(net, te->set, &te->elem);
7516 nft_trans_destroy(trans);
7518 case NFT_MSG_NEWOBJ:
7519 if (nft_trans_obj_update(trans)) {
7520 kfree(nft_trans_obj_newobj(trans));
7521 nft_trans_destroy(trans);
7523 trans->ctx.table->use--;
7524 nft_obj_del(nft_trans_obj(trans));
7527 case NFT_MSG_DELOBJ:
7528 trans->ctx.table->use++;
7529 nft_clear(trans->ctx.net, nft_trans_obj(trans));
7530 nft_trans_destroy(trans);
7532 case NFT_MSG_NEWFLOWTABLE:
7533 trans->ctx.table->use--;
7534 list_del_rcu(&nft_trans_flowtable(trans)->list);
7535 nft_unregister_flowtable_net_hooks(net,
7536 nft_trans_flowtable(trans));
7538 case NFT_MSG_DELFLOWTABLE:
7539 trans->ctx.table->use++;
7540 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
7541 nft_trans_destroy(trans);
7548 list_for_each_entry_safe_reverse(trans, next,
7549 &net->nft.commit_list, list) {
7550 list_del(&trans->list);
7551 nf_tables_abort_release(trans);
7555 nf_tables_module_autoload(net);
7557 nf_tables_module_autoload_cleanup(net);
7562 static void nf_tables_cleanup(struct net *net)
7564 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
7567 static int nf_tables_abort(struct net *net, struct sk_buff *skb, bool autoload)
7569 int ret = __nf_tables_abort(net, autoload);
7571 mutex_unlock(&net->nft.commit_mutex);
7576 static bool nf_tables_valid_genid(struct net *net, u32 genid)
7580 mutex_lock(&net->nft.commit_mutex);
7582 genid_ok = genid == 0 || net->nft.base_seq == genid;
7584 mutex_unlock(&net->nft.commit_mutex);
7586 /* else, commit mutex has to be released by commit or abort function */
7590 static const struct nfnetlink_subsystem nf_tables_subsys = {
7591 .name = "nf_tables",
7592 .subsys_id = NFNL_SUBSYS_NFTABLES,
7593 .cb_count = NFT_MSG_MAX,
7595 .commit = nf_tables_commit,
7596 .abort = nf_tables_abort,
7597 .cleanup = nf_tables_cleanup,
7598 .valid_genid = nf_tables_valid_genid,
7599 .owner = THIS_MODULE,
7602 int nft_chain_validate_dependency(const struct nft_chain *chain,
7603 enum nft_chain_types type)
7605 const struct nft_base_chain *basechain;
7607 if (nft_is_base_chain(chain)) {
7608 basechain = nft_base_chain(chain);
7609 if (basechain->type->type != type)
7614 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
7616 int nft_chain_validate_hooks(const struct nft_chain *chain,
7617 unsigned int hook_flags)
7619 struct nft_base_chain *basechain;
7621 if (nft_is_base_chain(chain)) {
7622 basechain = nft_base_chain(chain);
7624 if ((1 << basechain->ops.hooknum) & hook_flags)
7632 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
7635 * Loop detection - walk through the ruleset beginning at the destination chain
7636 * of a new jump until either the source chain is reached (loop) or all
7637 * reachable chains have been traversed.
7639 * The loop check is performed whenever a new jump verdict is added to an
7640 * expression or verdict map or a verdict map is bound to a new chain.
7643 static int nf_tables_check_loops(const struct nft_ctx *ctx,
7644 const struct nft_chain *chain);
7646 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
7647 struct nft_set *set,
7648 const struct nft_set_iter *iter,
7649 struct nft_set_elem *elem)
7651 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
7652 const struct nft_data *data;
7654 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
7655 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
7658 data = nft_set_ext_data(ext);
7659 switch (data->verdict.code) {
7662 return nf_tables_check_loops(ctx, data->verdict.chain);
7668 static int nf_tables_check_loops(const struct nft_ctx *ctx,
7669 const struct nft_chain *chain)
7671 const struct nft_rule *rule;
7672 const struct nft_expr *expr, *last;
7673 struct nft_set *set;
7674 struct nft_set_binding *binding;
7675 struct nft_set_iter iter;
7677 if (ctx->chain == chain)
7680 list_for_each_entry(rule, &chain->rules, list) {
7681 nft_rule_for_each_expr(expr, last, rule) {
7682 struct nft_immediate_expr *priv;
7683 const struct nft_data *data;
7686 if (strcmp(expr->ops->type->name, "immediate"))
7689 priv = nft_expr_priv(expr);
7690 if (priv->dreg != NFT_REG_VERDICT)
7694 switch (data->verdict.code) {
7697 err = nf_tables_check_loops(ctx,
7698 data->verdict.chain);
7707 list_for_each_entry(set, &ctx->table->sets, list) {
7708 if (!nft_is_active_next(ctx->net, set))
7710 if (!(set->flags & NFT_SET_MAP) ||
7711 set->dtype != NFT_DATA_VERDICT)
7714 list_for_each_entry(binding, &set->bindings, list) {
7715 if (!(binding->flags & NFT_SET_MAP) ||
7716 binding->chain != chain)
7719 iter.genmask = nft_genmask_next(ctx->net);
7723 iter.fn = nf_tables_loop_check_setelem;
7725 set->ops->walk(ctx, set, &iter);
7735 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
7737 * @attr: netlink attribute to fetch value from
7738 * @max: maximum value to be stored in dest
7739 * @dest: pointer to the variable
7741 * Parse, check and store a given u32 netlink attribute into variable.
7742 * This function returns -ERANGE if the value goes over maximum value.
7743 * Otherwise a 0 is returned and the attribute value is stored in the
7744 * destination variable.
7746 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
7750 val = ntohl(nla_get_be32(attr));
7757 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
7760 * nft_parse_register - parse a register value from a netlink attribute
7762 * @attr: netlink attribute
7764 * Parse and translate a register value from a netlink attribute.
7765 * Registers used to be 128 bit wide, these register numbers will be
7766 * mapped to the corresponding 32 bit register numbers.
7768 unsigned int nft_parse_register(const struct nlattr *attr)
7772 reg = ntohl(nla_get_be32(attr));
7774 case NFT_REG_VERDICT...NFT_REG_4:
7775 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
7777 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
7780 EXPORT_SYMBOL_GPL(nft_parse_register);
7783 * nft_dump_register - dump a register value to a netlink attribute
7785 * @skb: socket buffer
7786 * @attr: attribute number
7787 * @reg: register number
7789 * Construct a netlink attribute containing the register number. For
7790 * compatibility reasons, register numbers being a multiple of 4 are
7791 * translated to the corresponding 128 bit register numbers.
7793 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
7795 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
7796 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
7798 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
7800 return nla_put_be32(skb, attr, htonl(reg));
7802 EXPORT_SYMBOL_GPL(nft_dump_register);
7805 * nft_validate_register_load - validate a load from a register
7807 * @reg: the register number
7808 * @len: the length of the data
7810 * Validate that the input register is one of the general purpose
7811 * registers and that the length of the load is within the bounds.
7813 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
7815 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7819 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
7824 EXPORT_SYMBOL_GPL(nft_validate_register_load);
7827 * nft_validate_register_store - validate an expressions' register store
7829 * @ctx: context of the expression performing the load
7830 * @reg: the destination register number
7831 * @data: the data to load
7832 * @type: the data type
7833 * @len: the length of the data
7835 * Validate that a data load uses the appropriate data type for
7836 * the destination register and the length is within the bounds.
7837 * A value of NULL for the data means that its runtime gathered
7840 int nft_validate_register_store(const struct nft_ctx *ctx,
7841 enum nft_registers reg,
7842 const struct nft_data *data,
7843 enum nft_data_types type, unsigned int len)
7848 case NFT_REG_VERDICT:
7849 if (type != NFT_DATA_VERDICT)
7853 (data->verdict.code == NFT_GOTO ||
7854 data->verdict.code == NFT_JUMP)) {
7855 err = nf_tables_check_loops(ctx, data->verdict.chain);
7862 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7866 if (reg * NFT_REG32_SIZE + len >
7867 sizeof_field(struct nft_regs, data))
7870 if (data != NULL && type != NFT_DATA_VALUE)
7875 EXPORT_SYMBOL_GPL(nft_validate_register_store);
7877 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
7878 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
7879 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
7880 .len = NFT_CHAIN_MAXNAMELEN - 1 },
7883 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
7884 struct nft_data_desc *desc, const struct nlattr *nla)
7886 u8 genmask = nft_genmask_next(ctx->net);
7887 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
7888 struct nft_chain *chain;
7891 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
7892 nft_verdict_policy, NULL);
7896 if (!tb[NFTA_VERDICT_CODE])
7898 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
7900 switch (data->verdict.code) {
7902 switch (data->verdict.code & NF_VERDICT_MASK) {
7917 if (!tb[NFTA_VERDICT_CHAIN])
7919 chain = nft_chain_lookup(ctx->net, ctx->table,
7920 tb[NFTA_VERDICT_CHAIN], genmask);
7922 return PTR_ERR(chain);
7923 if (nft_is_base_chain(chain))
7927 data->verdict.chain = chain;
7931 desc->len = sizeof(data->verdict);
7932 desc->type = NFT_DATA_VERDICT;
7936 static void nft_verdict_uninit(const struct nft_data *data)
7938 switch (data->verdict.code) {
7941 data->verdict.chain->use--;
7946 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
7948 struct nlattr *nest;
7950 nest = nla_nest_start_noflag(skb, type);
7952 goto nla_put_failure;
7954 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
7955 goto nla_put_failure;
7960 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
7962 goto nla_put_failure;
7964 nla_nest_end(skb, nest);
7971 static int nft_value_init(const struct nft_ctx *ctx,
7972 struct nft_data *data, unsigned int size,
7973 struct nft_data_desc *desc, const struct nlattr *nla)
7983 nla_memcpy(data->data, nla, len);
7984 desc->type = NFT_DATA_VALUE;
7989 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
7992 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
7995 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
7996 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
7997 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
8001 * nft_data_init - parse nf_tables data netlink attributes
8003 * @ctx: context of the expression using the data
8004 * @data: destination struct nft_data
8005 * @size: maximum data length
8006 * @desc: data description
8007 * @nla: netlink attribute containing data
8009 * Parse the netlink data attributes and initialize a struct nft_data.
8010 * The type and length of data are returned in the data description.
8012 * The caller can indicate that it only wants to accept data of type
8013 * NFT_DATA_VALUE by passing NULL for the ctx argument.
8015 int nft_data_init(const struct nft_ctx *ctx,
8016 struct nft_data *data, unsigned int size,
8017 struct nft_data_desc *desc, const struct nlattr *nla)
8019 struct nlattr *tb[NFTA_DATA_MAX + 1];
8022 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
8023 nft_data_policy, NULL);
8027 if (tb[NFTA_DATA_VALUE])
8028 return nft_value_init(ctx, data, size, desc,
8029 tb[NFTA_DATA_VALUE]);
8030 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
8031 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
8034 EXPORT_SYMBOL_GPL(nft_data_init);
8037 * nft_data_release - release a nft_data item
8039 * @data: struct nft_data to release
8040 * @type: type of data
8042 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
8043 * all others need to be released by calling this function.
8045 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
8047 if (type < NFT_DATA_VERDICT)
8050 case NFT_DATA_VERDICT:
8051 return nft_verdict_uninit(data);
8056 EXPORT_SYMBOL_GPL(nft_data_release);
8058 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
8059 enum nft_data_types type, unsigned int len)
8061 struct nlattr *nest;
8064 nest = nla_nest_start_noflag(skb, attr);
8069 case NFT_DATA_VALUE:
8070 err = nft_value_dump(skb, data, len);
8072 case NFT_DATA_VERDICT:
8073 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
8080 nla_nest_end(skb, nest);
8083 EXPORT_SYMBOL_GPL(nft_data_dump);
8085 int __nft_release_basechain(struct nft_ctx *ctx)
8087 struct nft_rule *rule, *nr;
8089 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
8092 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
8093 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
8094 list_del(&rule->list);
8096 nf_tables_rule_release(ctx, rule);
8098 nft_chain_del(ctx->chain);
8100 nf_tables_chain_destroy(ctx);
8104 EXPORT_SYMBOL_GPL(__nft_release_basechain);
8106 static void __nft_release_tables(struct net *net)
8108 struct nft_flowtable *flowtable, *nf;
8109 struct nft_table *table, *nt;
8110 struct nft_chain *chain, *nc;
8111 struct nft_object *obj, *ne;
8112 struct nft_rule *rule, *nr;
8113 struct nft_set *set, *ns;
8114 struct nft_ctx ctx = {
8116 .family = NFPROTO_NETDEV,
8119 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
8120 ctx.family = table->family;
8122 list_for_each_entry(chain, &table->chains, list)
8123 nf_tables_unregister_hook(net, table, chain);
8124 /* No packets are walking on these chains anymore. */
8126 list_for_each_entry(chain, &table->chains, list) {
8128 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
8129 list_del(&rule->list);
8131 nf_tables_rule_release(&ctx, rule);
8134 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
8135 list_del(&flowtable->list);
8137 nf_tables_flowtable_destroy(flowtable);
8139 list_for_each_entry_safe(set, ns, &table->sets, list) {
8140 list_del(&set->list);
8142 nft_set_destroy(set);
8144 list_for_each_entry_safe(obj, ne, &table->objects, list) {
8147 nft_obj_destroy(&ctx, obj);
8149 list_for_each_entry_safe(chain, nc, &table->chains, list) {
8151 nft_chain_del(chain);
8153 nf_tables_chain_destroy(&ctx);
8155 list_del(&table->list);
8156 nf_tables_table_destroy(&ctx);
8160 static int __net_init nf_tables_init_net(struct net *net)
8162 INIT_LIST_HEAD(&net->nft.tables);
8163 INIT_LIST_HEAD(&net->nft.commit_list);
8164 INIT_LIST_HEAD(&net->nft.module_list);
8165 mutex_init(&net->nft.commit_mutex);
8166 net->nft.base_seq = 1;
8167 net->nft.validate_state = NFT_VALIDATE_SKIP;
8172 static void __net_exit nf_tables_exit_net(struct net *net)
8174 mutex_lock(&net->nft.commit_mutex);
8175 if (!list_empty(&net->nft.commit_list))
8176 __nf_tables_abort(net, false);
8177 __nft_release_tables(net);
8178 mutex_unlock(&net->nft.commit_mutex);
8179 WARN_ON_ONCE(!list_empty(&net->nft.tables));
8180 WARN_ON_ONCE(!list_empty(&net->nft.module_list));
8183 static struct pernet_operations nf_tables_net_ops = {
8184 .init = nf_tables_init_net,
8185 .exit = nf_tables_exit_net,
8188 static int __init nf_tables_module_init(void)
8192 spin_lock_init(&nf_tables_destroy_list_lock);
8193 err = register_pernet_subsys(&nf_tables_net_ops);
8197 err = nft_chain_filter_init();
8201 err = nf_tables_core_module_init();
8205 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
8209 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
8213 err = nft_offload_init();
8218 err = nfnetlink_subsys_register(&nf_tables_subsys);
8222 nft_chain_route_init();
8228 rhltable_destroy(&nft_objname_ht);
8230 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
8232 nf_tables_core_module_exit();
8234 nft_chain_filter_fini();
8236 unregister_pernet_subsys(&nf_tables_net_ops);
8240 static void __exit nf_tables_module_exit(void)
8242 nfnetlink_subsys_unregister(&nf_tables_subsys);
8244 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
8245 nft_chain_filter_fini();
8246 nft_chain_route_fini();
8247 unregister_pernet_subsys(&nf_tables_net_ops);
8248 cancel_work_sync(&trans_destroy_work);
8250 rhltable_destroy(&nft_objname_ht);
8251 nf_tables_core_module_exit();
8254 module_init(nf_tables_module_init);
8255 module_exit(nf_tables_module_exit);
8257 MODULE_LICENSE("GPL");
8258 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
8259 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);