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/audit.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_flow_table.h>
20 #include <net/netfilter/nf_tables_core.h>
21 #include <net/netfilter/nf_tables.h>
22 #include <net/netfilter/nf_tables_offload.h>
23 #include <net/net_namespace.h>
26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
28 unsigned int nf_tables_net_id __read_mostly;
30 static LIST_HEAD(nf_tables_expressions);
31 static LIST_HEAD(nf_tables_objects);
32 static LIST_HEAD(nf_tables_flowtables);
33 static LIST_HEAD(nf_tables_destroy_list);
34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
35 static u64 table_handle;
38 NFT_VALIDATE_SKIP = 0,
43 static struct rhltable nft_objname_ht;
45 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
46 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
47 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
49 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
50 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
51 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
53 static const struct rhashtable_params nft_chain_ht_params = {
54 .head_offset = offsetof(struct nft_chain, rhlhead),
55 .key_offset = offsetof(struct nft_chain, name),
56 .hashfn = nft_chain_hash,
57 .obj_hashfn = nft_chain_hash_obj,
58 .obj_cmpfn = nft_chain_hash_cmp,
59 .automatic_shrinking = true,
62 static const struct rhashtable_params nft_objname_ht_params = {
63 .head_offset = offsetof(struct nft_object, rhlhead),
64 .key_offset = offsetof(struct nft_object, key),
65 .hashfn = nft_objname_hash,
66 .obj_hashfn = nft_objname_hash_obj,
67 .obj_cmpfn = nft_objname_hash_cmp,
68 .automatic_shrinking = true,
71 struct nft_audit_data {
72 struct nft_table *table;
75 struct list_head list;
78 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
79 [NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER,
80 [NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID,
81 [NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER,
82 [NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER,
83 [NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID,
84 [NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER,
85 [NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER,
86 [NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID,
87 [NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER,
88 [NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER,
89 [NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID,
90 [NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER,
91 [NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER,
92 [NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID,
93 [NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER,
94 [NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER,
95 [NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID,
96 [NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID,
97 [NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER,
98 [NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID,
99 [NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER,
100 [NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET,
101 [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
102 [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
103 [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
106 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
108 struct nftables_pernet *nft_net = nft_pernet(net);
110 switch (nft_net->validate_state) {
111 case NFT_VALIDATE_SKIP:
112 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
114 case NFT_VALIDATE_NEED:
116 case NFT_VALIDATE_DO:
117 if (new_validate_state == NFT_VALIDATE_NEED)
121 nft_net->validate_state = new_validate_state;
123 static void nf_tables_trans_destroy_work(struct work_struct *w);
124 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
126 static void nft_ctx_init(struct nft_ctx *ctx,
128 const struct sk_buff *skb,
129 const struct nlmsghdr *nlh,
131 struct nft_table *table,
132 struct nft_chain *chain,
133 const struct nlattr * const *nla)
136 ctx->family = family;
141 ctx->portid = NETLINK_CB(skb).portid;
142 ctx->report = nlmsg_report(nlh);
143 ctx->flags = nlh->nlmsg_flags;
144 ctx->seq = nlh->nlmsg_seq;
147 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
148 int msg_type, u32 size, gfp_t gfp)
150 struct nft_trans *trans;
152 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
156 trans->msg_type = msg_type;
162 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
163 int msg_type, u32 size)
165 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
168 static void nft_trans_destroy(struct nft_trans *trans)
170 list_del(&trans->list);
174 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
176 struct nftables_pernet *nft_net;
177 struct net *net = ctx->net;
178 struct nft_trans *trans;
180 if (!nft_set_is_anonymous(set))
183 nft_net = nft_pernet(net);
184 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
185 switch (trans->msg_type) {
187 if (nft_trans_set(trans) == set)
188 nft_trans_set_bound(trans) = true;
190 case NFT_MSG_NEWSETELEM:
191 if (nft_trans_elem_set(trans) == set)
192 nft_trans_elem_set_bound(trans) = true;
198 static int nft_netdev_register_hooks(struct net *net,
199 struct list_head *hook_list)
201 struct nft_hook *hook;
205 list_for_each_entry(hook, hook_list, list) {
206 err = nf_register_net_hook(net, &hook->ops);
215 list_for_each_entry(hook, hook_list, list) {
219 nf_unregister_net_hook(net, &hook->ops);
224 static void nft_netdev_unregister_hooks(struct net *net,
225 struct list_head *hook_list)
227 struct nft_hook *hook;
229 list_for_each_entry(hook, hook_list, list)
230 nf_unregister_net_hook(net, &hook->ops);
233 static int nf_tables_register_hook(struct net *net,
234 const struct nft_table *table,
235 struct nft_chain *chain)
237 struct nft_base_chain *basechain;
238 const struct nf_hook_ops *ops;
240 if (table->flags & NFT_TABLE_F_DORMANT ||
241 !nft_is_base_chain(chain))
244 basechain = nft_base_chain(chain);
245 ops = &basechain->ops;
247 if (basechain->type->ops_register)
248 return basechain->type->ops_register(net, ops);
250 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
251 return nft_netdev_register_hooks(net, &basechain->hook_list);
253 return nf_register_net_hook(net, &basechain->ops);
256 static void nf_tables_unregister_hook(struct net *net,
257 const struct nft_table *table,
258 struct nft_chain *chain)
260 struct nft_base_chain *basechain;
261 const struct nf_hook_ops *ops;
263 if (table->flags & NFT_TABLE_F_DORMANT ||
264 !nft_is_base_chain(chain))
266 basechain = nft_base_chain(chain);
267 ops = &basechain->ops;
269 if (basechain->type->ops_unregister)
270 return basechain->type->ops_unregister(net, ops);
272 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
273 nft_netdev_unregister_hooks(net, &basechain->hook_list);
275 nf_unregister_net_hook(net, &basechain->ops);
278 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
280 struct nftables_pernet *nft_net = nft_pernet(net);
282 list_add_tail(&trans->list, &nft_net->commit_list);
285 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
287 struct nft_trans *trans;
289 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
293 if (msg_type == NFT_MSG_NEWTABLE)
294 nft_activate_next(ctx->net, ctx->table);
296 nft_trans_commit_list_add_tail(ctx->net, trans);
300 static int nft_deltable(struct nft_ctx *ctx)
304 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
308 nft_deactivate_next(ctx->net, ctx->table);
312 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
314 struct nft_trans *trans;
316 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
318 return ERR_PTR(-ENOMEM);
320 if (msg_type == NFT_MSG_NEWCHAIN) {
321 nft_activate_next(ctx->net, ctx->chain);
323 if (ctx->nla[NFTA_CHAIN_ID]) {
324 nft_trans_chain_id(trans) =
325 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
329 nft_trans_commit_list_add_tail(ctx->net, trans);
333 static int nft_delchain(struct nft_ctx *ctx)
335 struct nft_trans *trans;
337 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
339 return PTR_ERR(trans);
342 nft_deactivate_next(ctx->net, ctx->chain);
347 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
348 struct nft_rule *rule)
350 struct nft_expr *expr;
352 expr = nft_expr_first(rule);
353 while (nft_expr_more(rule, expr)) {
354 if (expr->ops->activate)
355 expr->ops->activate(ctx, expr);
357 expr = nft_expr_next(expr);
361 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
362 struct nft_rule *rule,
363 enum nft_trans_phase phase)
365 struct nft_expr *expr;
367 expr = nft_expr_first(rule);
368 while (nft_expr_more(rule, expr)) {
369 if (expr->ops->deactivate)
370 expr->ops->deactivate(ctx, expr, phase);
372 expr = nft_expr_next(expr);
377 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
379 /* You cannot delete the same rule twice */
380 if (nft_is_active_next(ctx->net, rule)) {
381 nft_deactivate_next(ctx->net, rule);
388 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
389 struct nft_rule *rule)
391 struct nft_trans *trans;
393 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
397 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
398 nft_trans_rule_id(trans) =
399 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
401 nft_trans_rule(trans) = rule;
402 nft_trans_commit_list_add_tail(ctx->net, trans);
407 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
409 struct nft_flow_rule *flow;
410 struct nft_trans *trans;
413 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
417 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
418 flow = nft_flow_rule_create(ctx->net, rule);
420 nft_trans_destroy(trans);
421 return PTR_ERR(flow);
424 nft_trans_flow_rule(trans) = flow;
427 err = nf_tables_delrule_deactivate(ctx, rule);
429 nft_trans_destroy(trans);
432 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
437 static int nft_delrule_by_chain(struct nft_ctx *ctx)
439 struct nft_rule *rule;
442 list_for_each_entry(rule, &ctx->chain->rules, list) {
443 if (!nft_is_active_next(ctx->net, rule))
446 err = nft_delrule(ctx, rule);
453 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
456 struct nft_trans *trans;
458 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
462 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
463 nft_trans_set_id(trans) =
464 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
465 nft_activate_next(ctx->net, set);
467 nft_trans_set(trans) = set;
468 nft_trans_commit_list_add_tail(ctx->net, trans);
473 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
477 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
481 nft_deactivate_next(ctx->net, set);
487 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
488 struct nft_object *obj)
490 struct nft_trans *trans;
492 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
496 if (msg_type == NFT_MSG_NEWOBJ)
497 nft_activate_next(ctx->net, obj);
499 nft_trans_obj(trans) = obj;
500 nft_trans_commit_list_add_tail(ctx->net, trans);
505 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
509 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
513 nft_deactivate_next(ctx->net, obj);
519 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
520 struct nft_flowtable *flowtable)
522 struct nft_trans *trans;
524 trans = nft_trans_alloc(ctx, msg_type,
525 sizeof(struct nft_trans_flowtable));
529 if (msg_type == NFT_MSG_NEWFLOWTABLE)
530 nft_activate_next(ctx->net, flowtable);
532 nft_trans_flowtable(trans) = flowtable;
533 nft_trans_commit_list_add_tail(ctx->net, trans);
538 static int nft_delflowtable(struct nft_ctx *ctx,
539 struct nft_flowtable *flowtable)
543 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
547 nft_deactivate_next(ctx->net, flowtable);
557 static struct nft_table *nft_table_lookup(const struct net *net,
558 const struct nlattr *nla,
559 u8 family, u8 genmask, u32 nlpid)
561 struct nftables_pernet *nft_net;
562 struct nft_table *table;
565 return ERR_PTR(-EINVAL);
567 nft_net = nft_pernet(net);
568 list_for_each_entry_rcu(table, &nft_net->tables, list,
569 lockdep_is_held(&nft_net->commit_mutex)) {
570 if (!nla_strcmp(nla, table->name) &&
571 table->family == family &&
572 nft_active_genmask(table, genmask)) {
573 if (nft_table_has_owner(table) &&
574 nlpid && table->nlpid != nlpid)
575 return ERR_PTR(-EPERM);
581 return ERR_PTR(-ENOENT);
584 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
585 const struct nlattr *nla,
586 u8 genmask, u32 nlpid)
588 struct nftables_pernet *nft_net;
589 struct nft_table *table;
591 nft_net = nft_pernet(net);
592 list_for_each_entry(table, &nft_net->tables, list) {
593 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
594 nft_active_genmask(table, genmask)) {
595 if (nft_table_has_owner(table) &&
596 nlpid && table->nlpid != nlpid)
597 return ERR_PTR(-EPERM);
603 return ERR_PTR(-ENOENT);
606 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
608 return ++table->hgenerator;
611 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
613 static const struct nft_chain_type *
614 __nft_chain_type_get(u8 family, enum nft_chain_types type)
616 if (family >= NFPROTO_NUMPROTO ||
617 type >= NFT_CHAIN_T_MAX)
620 return chain_type[family][type];
623 static const struct nft_chain_type *
624 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
626 const struct nft_chain_type *type;
629 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
630 type = __nft_chain_type_get(family, i);
633 if (!nla_strcmp(nla, type->name))
639 struct nft_module_request {
640 struct list_head list;
641 char module[MODULE_NAME_LEN];
645 #ifdef CONFIG_MODULES
646 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
649 char module_name[MODULE_NAME_LEN];
650 struct nftables_pernet *nft_net;
651 struct nft_module_request *req;
656 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
658 if (ret >= MODULE_NAME_LEN)
661 nft_net = nft_pernet(net);
662 list_for_each_entry(req, &nft_net->module_list, list) {
663 if (!strcmp(req->module, module_name)) {
667 /* A request to load this module already exists. */
672 req = kmalloc(sizeof(*req), GFP_KERNEL);
677 strlcpy(req->module, module_name, MODULE_NAME_LEN);
678 list_add_tail(&req->list, &nft_net->module_list);
682 EXPORT_SYMBOL_GPL(nft_request_module);
685 static void lockdep_nfnl_nft_mutex_not_held(void)
687 #ifdef CONFIG_PROVE_LOCKING
689 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
693 static const struct nft_chain_type *
694 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
695 u8 family, bool autoload)
697 const struct nft_chain_type *type;
699 type = __nf_tables_chain_type_lookup(nla, family);
703 lockdep_nfnl_nft_mutex_not_held();
704 #ifdef CONFIG_MODULES
706 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
708 (const char *)nla_data(nla)) == -EAGAIN)
709 return ERR_PTR(-EAGAIN);
712 return ERR_PTR(-ENOENT);
715 static __be16 nft_base_seq(const struct net *net)
717 struct nftables_pernet *nft_net = nft_pernet(net);
719 return htons(nft_net->base_seq & 0xffff);
722 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
723 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
724 .len = NFT_TABLE_MAXNAMELEN - 1 },
725 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
726 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
727 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
728 .len = NFT_USERDATA_MAXLEN }
731 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
732 u32 portid, u32 seq, int event, u32 flags,
733 int family, const struct nft_table *table)
735 struct nlmsghdr *nlh;
737 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
738 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
739 NFNETLINK_V0, nft_base_seq(net));
741 goto nla_put_failure;
743 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
744 nla_put_be32(skb, NFTA_TABLE_FLAGS,
745 htonl(table->flags & NFT_TABLE_F_MASK)) ||
746 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
747 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
749 goto nla_put_failure;
750 if (nft_table_has_owner(table) &&
751 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
752 goto nla_put_failure;
755 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
756 goto nla_put_failure;
763 nlmsg_trim(skb, nlh);
767 struct nftnl_skb_parms {
770 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
772 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
773 struct list_head *notify_list)
775 NFT_CB(skb).report = report;
776 list_add_tail(&skb->list, notify_list);
779 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
781 struct nftables_pernet *nft_net;
786 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
789 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
793 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
794 event, 0, ctx->family, ctx->table);
800 nft_net = nft_pernet(ctx->net);
801 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
804 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
807 static int nf_tables_dump_tables(struct sk_buff *skb,
808 struct netlink_callback *cb)
810 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
811 struct nftables_pernet *nft_net;
812 const struct nft_table *table;
813 unsigned int idx = 0, s_idx = cb->args[0];
814 struct net *net = sock_net(skb->sk);
815 int family = nfmsg->nfgen_family;
818 nft_net = nft_pernet(net);
819 cb->seq = nft_net->base_seq;
821 list_for_each_entry_rcu(table, &nft_net->tables, list) {
822 if (family != NFPROTO_UNSPEC && family != table->family)
828 memset(&cb->args[1], 0,
829 sizeof(cb->args) - sizeof(cb->args[0]));
830 if (!nft_is_active(net, table))
832 if (nf_tables_fill_table_info(skb, net,
833 NETLINK_CB(cb->skb).portid,
835 NFT_MSG_NEWTABLE, NLM_F_MULTI,
836 table->family, table) < 0)
839 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
849 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
850 const struct nlmsghdr *nlh,
851 struct netlink_dump_control *c)
855 if (!try_module_get(THIS_MODULE))
859 err = netlink_dump_start(nlsk, skb, nlh, c);
861 module_put(THIS_MODULE);
866 /* called with rcu_read_lock held */
867 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
868 const struct nlattr * const nla[])
870 struct netlink_ext_ack *extack = info->extack;
871 u8 genmask = nft_genmask_cur(info->net);
872 u8 family = info->nfmsg->nfgen_family;
873 const struct nft_table *table;
874 struct net *net = info->net;
875 struct sk_buff *skb2;
878 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
879 struct netlink_dump_control c = {
880 .dump = nf_tables_dump_tables,
881 .module = THIS_MODULE,
884 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
887 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
889 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
890 return PTR_ERR(table);
893 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
897 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
898 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
901 goto err_fill_table_info;
903 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
910 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
912 struct nft_chain *chain;
915 list_for_each_entry(chain, &table->chains, list) {
916 if (!nft_is_active_next(net, chain))
918 if (!nft_is_base_chain(chain))
921 if (cnt && i++ == cnt)
924 nf_tables_unregister_hook(net, table, chain);
928 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
930 struct nft_chain *chain;
933 list_for_each_entry(chain, &table->chains, list) {
934 if (!nft_is_active_next(net, chain))
936 if (!nft_is_base_chain(chain))
939 err = nf_tables_register_hook(net, table, chain);
941 goto err_register_hooks;
949 nft_table_disable(net, table, i);
953 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
955 table->flags &= ~NFT_TABLE_F_DORMANT;
956 nft_table_disable(net, table, 0);
957 table->flags |= NFT_TABLE_F_DORMANT;
960 #define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
961 #define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
962 #define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
963 #define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
964 __NFT_TABLE_F_WAS_AWAKEN)
966 static int nf_tables_updtable(struct nft_ctx *ctx)
968 struct nft_trans *trans;
972 if (!ctx->nla[NFTA_TABLE_FLAGS])
975 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
976 if (flags & ~NFT_TABLE_F_MASK)
979 if (flags == ctx->table->flags)
982 if ((nft_table_has_owner(ctx->table) &&
983 !(flags & NFT_TABLE_F_OWNER)) ||
984 (!nft_table_has_owner(ctx->table) &&
985 flags & NFT_TABLE_F_OWNER))
988 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
989 sizeof(struct nft_trans_table));
993 if ((flags & NFT_TABLE_F_DORMANT) &&
994 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
995 ctx->table->flags |= NFT_TABLE_F_DORMANT;
996 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
997 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
998 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
999 ctx->table->flags & NFT_TABLE_F_DORMANT) {
1000 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1001 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1002 ret = nf_tables_table_enable(ctx->net, ctx->table);
1004 goto err_register_hooks;
1006 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1010 nft_trans_table_update(trans) = true;
1011 nft_trans_commit_list_add_tail(ctx->net, trans);
1016 nft_trans_destroy(trans);
1020 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1022 const char *name = data;
1024 return jhash(name, strlen(name), seed);
1027 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1029 const struct nft_chain *chain = data;
1031 return nft_chain_hash(chain->name, 0, seed);
1034 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1037 const struct nft_chain *chain = ptr;
1038 const char *name = arg->key;
1040 return strcmp(chain->name, name);
1043 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1045 const struct nft_object_hash_key *k = data;
1047 seed ^= hash_ptr(k->table, 32);
1049 return jhash(k->name, strlen(k->name), seed);
1052 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1054 const struct nft_object *obj = data;
1056 return nft_objname_hash(&obj->key, 0, seed);
1059 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1062 const struct nft_object_hash_key *k = arg->key;
1063 const struct nft_object *obj = ptr;
1065 if (obj->key.table != k->table)
1068 return strcmp(obj->key.name, k->name);
1071 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1072 const struct nlattr * const nla[])
1074 struct nftables_pernet *nft_net = nft_pernet(info->net);
1075 struct netlink_ext_ack *extack = info->extack;
1076 u8 genmask = nft_genmask_next(info->net);
1077 u8 family = info->nfmsg->nfgen_family;
1078 struct net *net = info->net;
1079 const struct nlattr *attr;
1080 struct nft_table *table;
1085 lockdep_assert_held(&nft_net->commit_mutex);
1086 attr = nla[NFTA_TABLE_NAME];
1087 table = nft_table_lookup(net, attr, family, genmask,
1088 NETLINK_CB(skb).portid);
1089 if (IS_ERR(table)) {
1090 if (PTR_ERR(table) != -ENOENT)
1091 return PTR_ERR(table);
1093 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1094 NL_SET_BAD_ATTR(extack, attr);
1097 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1100 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1102 return nf_tables_updtable(&ctx);
1105 if (nla[NFTA_TABLE_FLAGS]) {
1106 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1107 if (flags & ~NFT_TABLE_F_MASK)
1112 table = kzalloc(sizeof(*table), GFP_KERNEL);
1116 table->name = nla_strdup(attr, GFP_KERNEL);
1117 if (table->name == NULL)
1120 if (nla[NFTA_TABLE_USERDATA]) {
1121 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL);
1122 if (table->udata == NULL)
1123 goto err_table_udata;
1125 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1128 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1132 INIT_LIST_HEAD(&table->chains);
1133 INIT_LIST_HEAD(&table->sets);
1134 INIT_LIST_HEAD(&table->objects);
1135 INIT_LIST_HEAD(&table->flowtables);
1136 table->family = family;
1137 table->flags = flags;
1138 table->handle = ++table_handle;
1139 if (table->flags & NFT_TABLE_F_OWNER)
1140 table->nlpid = NETLINK_CB(skb).portid;
1142 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1143 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1147 list_add_tail_rcu(&table->list, &nft_net->tables);
1150 rhltable_destroy(&table->chains_ht);
1152 kfree(table->udata);
1161 static int nft_flush_table(struct nft_ctx *ctx)
1163 struct nft_flowtable *flowtable, *nft;
1164 struct nft_chain *chain, *nc;
1165 struct nft_object *obj, *ne;
1166 struct nft_set *set, *ns;
1169 list_for_each_entry(chain, &ctx->table->chains, list) {
1170 if (!nft_is_active_next(ctx->net, chain))
1173 if (nft_chain_is_bound(chain))
1178 err = nft_delrule_by_chain(ctx);
1183 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1184 if (!nft_is_active_next(ctx->net, set))
1187 if (nft_set_is_anonymous(set) &&
1188 !list_empty(&set->bindings))
1191 err = nft_delset(ctx, set);
1196 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1197 if (!nft_is_active_next(ctx->net, flowtable))
1200 err = nft_delflowtable(ctx, flowtable);
1205 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1206 if (!nft_is_active_next(ctx->net, obj))
1209 err = nft_delobj(ctx, obj);
1214 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1215 if (!nft_is_active_next(ctx->net, chain))
1218 if (nft_chain_is_bound(chain))
1223 err = nft_delchain(ctx);
1228 err = nft_deltable(ctx);
1233 static int nft_flush(struct nft_ctx *ctx, int family)
1235 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1236 const struct nlattr * const *nla = ctx->nla;
1237 struct nft_table *table, *nt;
1240 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1241 if (family != AF_UNSPEC && table->family != family)
1244 ctx->family = table->family;
1246 if (!nft_is_active_next(ctx->net, table))
1249 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1252 if (nla[NFTA_TABLE_NAME] &&
1253 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1258 err = nft_flush_table(ctx);
1266 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1267 const struct nlattr * const nla[])
1269 struct netlink_ext_ack *extack = info->extack;
1270 u8 genmask = nft_genmask_next(info->net);
1271 u8 family = info->nfmsg->nfgen_family;
1272 struct net *net = info->net;
1273 const struct nlattr *attr;
1274 struct nft_table *table;
1277 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1278 if (family == AF_UNSPEC ||
1279 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1280 return nft_flush(&ctx, family);
1282 if (nla[NFTA_TABLE_HANDLE]) {
1283 attr = nla[NFTA_TABLE_HANDLE];
1284 table = nft_table_lookup_byhandle(net, attr, genmask,
1285 NETLINK_CB(skb).portid);
1287 attr = nla[NFTA_TABLE_NAME];
1288 table = nft_table_lookup(net, attr, family, genmask,
1289 NETLINK_CB(skb).portid);
1292 if (IS_ERR(table)) {
1293 NL_SET_BAD_ATTR(extack, attr);
1294 return PTR_ERR(table);
1297 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1301 ctx.family = family;
1304 return nft_flush_table(&ctx);
1307 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1309 if (WARN_ON(ctx->table->use > 0))
1312 rhltable_destroy(&ctx->table->chains_ht);
1313 kfree(ctx->table->name);
1314 kfree(ctx->table->udata);
1318 void nft_register_chain_type(const struct nft_chain_type *ctype)
1320 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1321 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1322 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1325 chain_type[ctype->family][ctype->type] = ctype;
1326 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1328 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1330 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1332 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1333 chain_type[ctype->family][ctype->type] = NULL;
1334 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1336 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1342 static struct nft_chain *
1343 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1345 struct nft_chain *chain;
1347 list_for_each_entry(chain, &table->chains, list) {
1348 if (chain->handle == handle &&
1349 nft_active_genmask(chain, genmask))
1353 return ERR_PTR(-ENOENT);
1356 static bool lockdep_commit_lock_is_held(const struct net *net)
1358 #ifdef CONFIG_PROVE_LOCKING
1359 struct nftables_pernet *nft_net = nft_pernet(net);
1361 return lockdep_is_held(&nft_net->commit_mutex);
1367 static struct nft_chain *nft_chain_lookup(struct net *net,
1368 struct nft_table *table,
1369 const struct nlattr *nla, u8 genmask)
1371 char search[NFT_CHAIN_MAXNAMELEN + 1];
1372 struct rhlist_head *tmp, *list;
1373 struct nft_chain *chain;
1376 return ERR_PTR(-EINVAL);
1378 nla_strscpy(search, nla, sizeof(search));
1380 WARN_ON(!rcu_read_lock_held() &&
1381 !lockdep_commit_lock_is_held(net));
1383 chain = ERR_PTR(-ENOENT);
1385 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1389 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1390 if (nft_active_genmask(chain, genmask))
1393 chain = ERR_PTR(-ENOENT);
1399 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1400 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1401 .len = NFT_TABLE_MAXNAMELEN - 1 },
1402 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1403 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1404 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1405 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1406 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1407 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1408 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1409 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1410 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1411 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1412 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1413 .len = NFT_USERDATA_MAXLEN },
1416 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1417 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1418 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1419 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1420 .len = IFNAMSIZ - 1 },
1423 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1425 struct nft_stats *cpu_stats, total;
1426 struct nlattr *nest;
1434 memset(&total, 0, sizeof(total));
1435 for_each_possible_cpu(cpu) {
1436 cpu_stats = per_cpu_ptr(stats, cpu);
1438 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1439 pkts = cpu_stats->pkts;
1440 bytes = cpu_stats->bytes;
1441 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1443 total.bytes += bytes;
1445 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1447 goto nla_put_failure;
1449 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1450 NFTA_COUNTER_PAD) ||
1451 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1453 goto nla_put_failure;
1455 nla_nest_end(skb, nest);
1462 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1463 const struct nft_base_chain *basechain)
1465 const struct nf_hook_ops *ops = &basechain->ops;
1466 struct nft_hook *hook, *first = NULL;
1467 struct nlattr *nest, *nest_devs;
1470 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1472 goto nla_put_failure;
1473 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1474 goto nla_put_failure;
1475 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1476 goto nla_put_failure;
1478 if (nft_base_chain_netdev(family, ops->hooknum)) {
1479 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1480 list_for_each_entry(hook, &basechain->hook_list, list) {
1484 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1485 hook->ops.dev->name))
1486 goto nla_put_failure;
1489 nla_nest_end(skb, nest_devs);
1492 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1493 goto nla_put_failure;
1495 nla_nest_end(skb, nest);
1502 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1503 u32 portid, u32 seq, int event, u32 flags,
1504 int family, const struct nft_table *table,
1505 const struct nft_chain *chain)
1507 struct nlmsghdr *nlh;
1509 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1510 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1511 NFNETLINK_V0, nft_base_seq(net));
1513 goto nla_put_failure;
1515 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1516 goto nla_put_failure;
1517 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1519 goto nla_put_failure;
1520 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1521 goto nla_put_failure;
1523 if (nft_is_base_chain(chain)) {
1524 const struct nft_base_chain *basechain = nft_base_chain(chain);
1525 struct nft_stats __percpu *stats;
1527 if (nft_dump_basechain_hook(skb, family, basechain))
1528 goto nla_put_failure;
1530 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1531 htonl(basechain->policy)))
1532 goto nla_put_failure;
1534 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1535 goto nla_put_failure;
1537 stats = rcu_dereference_check(basechain->stats,
1538 lockdep_commit_lock_is_held(net));
1539 if (nft_dump_stats(skb, stats))
1540 goto nla_put_failure;
1544 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1545 goto nla_put_failure;
1547 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1548 goto nla_put_failure;
1551 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1552 goto nla_put_failure;
1554 nlmsg_end(skb, nlh);
1558 nlmsg_trim(skb, nlh);
1562 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1564 struct nftables_pernet *nft_net;
1565 struct sk_buff *skb;
1569 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1572 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1576 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1577 event, 0, ctx->family, ctx->table,
1584 nft_net = nft_pernet(ctx->net);
1585 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1588 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1591 static int nf_tables_dump_chains(struct sk_buff *skb,
1592 struct netlink_callback *cb)
1594 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1595 unsigned int idx = 0, s_idx = cb->args[0];
1596 struct net *net = sock_net(skb->sk);
1597 int family = nfmsg->nfgen_family;
1598 struct nftables_pernet *nft_net;
1599 const struct nft_table *table;
1600 const struct nft_chain *chain;
1603 nft_net = nft_pernet(net);
1604 cb->seq = nft_net->base_seq;
1606 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1607 if (family != NFPROTO_UNSPEC && family != table->family)
1610 list_for_each_entry_rcu(chain, &table->chains, list) {
1614 memset(&cb->args[1], 0,
1615 sizeof(cb->args) - sizeof(cb->args[0]));
1616 if (!nft_is_active(net, chain))
1618 if (nf_tables_fill_chain_info(skb, net,
1619 NETLINK_CB(cb->skb).portid,
1623 table->family, table,
1627 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1638 /* called with rcu_read_lock held */
1639 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1640 const struct nlattr * const nla[])
1642 struct netlink_ext_ack *extack = info->extack;
1643 u8 genmask = nft_genmask_cur(info->net);
1644 u8 family = info->nfmsg->nfgen_family;
1645 const struct nft_chain *chain;
1646 struct net *net = info->net;
1647 struct nft_table *table;
1648 struct sk_buff *skb2;
1651 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1652 struct netlink_dump_control c = {
1653 .dump = nf_tables_dump_chains,
1654 .module = THIS_MODULE,
1657 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1660 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1661 if (IS_ERR(table)) {
1662 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1663 return PTR_ERR(table);
1666 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1667 if (IS_ERR(chain)) {
1668 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1669 return PTR_ERR(chain);
1672 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1676 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1677 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1678 0, family, table, chain);
1680 goto err_fill_chain_info;
1682 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1684 err_fill_chain_info:
1689 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1690 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1691 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1694 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1696 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1697 struct nft_stats __percpu *newstats;
1698 struct nft_stats *stats;
1701 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1702 nft_counter_policy, NULL);
1704 return ERR_PTR(err);
1706 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1707 return ERR_PTR(-EINVAL);
1709 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1710 if (newstats == NULL)
1711 return ERR_PTR(-ENOMEM);
1713 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1714 * are not exposed to userspace.
1717 stats = this_cpu_ptr(newstats);
1718 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1719 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1725 static void nft_chain_stats_replace(struct nft_trans *trans)
1727 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1729 if (!nft_trans_chain_stats(trans))
1732 nft_trans_chain_stats(trans) =
1733 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1734 lockdep_commit_lock_is_held(trans->ctx.net));
1736 if (!nft_trans_chain_stats(trans))
1737 static_branch_inc(&nft_counters_enabled);
1740 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1742 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1743 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1749 /* should be NULL either via abort or via successful commit */
1750 WARN_ON_ONCE(chain->rules_next);
1751 kvfree(chain->rules_next);
1754 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1756 struct nft_chain *chain = ctx->chain;
1757 struct nft_hook *hook, *next;
1759 if (WARN_ON(chain->use > 0))
1762 /* no concurrent access possible anymore */
1763 nf_tables_chain_free_chain_rules(chain);
1765 if (nft_is_base_chain(chain)) {
1766 struct nft_base_chain *basechain = nft_base_chain(chain);
1768 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1769 list_for_each_entry_safe(hook, next,
1770 &basechain->hook_list, list) {
1771 list_del_rcu(&hook->list);
1772 kfree_rcu(hook, rcu);
1775 module_put(basechain->type->owner);
1776 if (rcu_access_pointer(basechain->stats)) {
1777 static_branch_dec(&nft_counters_enabled);
1778 free_percpu(rcu_dereference_raw(basechain->stats));
1781 kfree(chain->udata);
1785 kfree(chain->udata);
1790 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1791 const struct nlattr *attr)
1793 struct net_device *dev;
1794 char ifname[IFNAMSIZ];
1795 struct nft_hook *hook;
1798 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1801 goto err_hook_alloc;
1804 nla_strscpy(ifname, attr, IFNAMSIZ);
1805 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1806 * indirectly serializing all the other holders of the commit_mutex with
1809 dev = __dev_get_by_name(net, ifname);
1814 hook->ops.dev = dev;
1815 hook->inactive = false;
1822 return ERR_PTR(err);
1825 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1826 const struct nft_hook *this)
1828 struct nft_hook *hook;
1830 list_for_each_entry(hook, hook_list, list) {
1831 if (this->ops.dev == hook->ops.dev)
1838 static int nf_tables_parse_netdev_hooks(struct net *net,
1839 const struct nlattr *attr,
1840 struct list_head *hook_list)
1842 struct nft_hook *hook, *next;
1843 const struct nlattr *tmp;
1844 int rem, n = 0, err;
1846 nla_for_each_nested(tmp, attr, rem) {
1847 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1852 hook = nft_netdev_hook_alloc(net, tmp);
1854 err = PTR_ERR(hook);
1857 if (nft_hook_list_find(hook_list, hook)) {
1862 list_add_tail(&hook->list, hook_list);
1865 if (n == NFT_NETDEVICE_MAX) {
1874 list_for_each_entry_safe(hook, next, hook_list, list) {
1875 list_del(&hook->list);
1881 struct nft_chain_hook {
1884 const struct nft_chain_type *type;
1885 struct list_head list;
1888 static int nft_chain_parse_netdev(struct net *net,
1889 struct nlattr *tb[],
1890 struct list_head *hook_list)
1892 struct nft_hook *hook;
1895 if (tb[NFTA_HOOK_DEV]) {
1896 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1898 return PTR_ERR(hook);
1900 list_add_tail(&hook->list, hook_list);
1901 } else if (tb[NFTA_HOOK_DEVS]) {
1902 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1907 if (list_empty(hook_list))
1916 static int nft_chain_parse_hook(struct net *net,
1917 const struct nlattr * const nla[],
1918 struct nft_chain_hook *hook, u8 family,
1919 struct netlink_ext_ack *extack, bool autoload)
1921 struct nftables_pernet *nft_net = nft_pernet(net);
1922 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1923 const struct nft_chain_type *type;
1926 lockdep_assert_held(&nft_net->commit_mutex);
1927 lockdep_nfnl_nft_mutex_not_held();
1929 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1930 nla[NFTA_CHAIN_HOOK],
1931 nft_hook_policy, NULL);
1935 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1936 ha[NFTA_HOOK_PRIORITY] == NULL)
1939 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1940 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1942 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1946 if (nla[NFTA_CHAIN_TYPE]) {
1947 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1950 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
1951 return PTR_ERR(type);
1954 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1957 if (type->type == NFT_CHAIN_T_NAT &&
1958 hook->priority <= NF_IP_PRI_CONNTRACK)
1961 if (!try_module_get(type->owner)) {
1962 if (nla[NFTA_CHAIN_TYPE])
1963 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
1969 INIT_LIST_HEAD(&hook->list);
1970 if (nft_base_chain_netdev(family, hook->num)) {
1971 err = nft_chain_parse_netdev(net, ha, &hook->list);
1973 module_put(type->owner);
1976 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
1977 module_put(type->owner);
1984 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1986 struct nft_hook *h, *next;
1988 list_for_each_entry_safe(h, next, &hook->list, list) {
1992 module_put(hook->type->owner);
1995 struct nft_rules_old {
1997 struct nft_rule **start;
2000 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2003 if (alloc > INT_MAX)
2006 alloc += 1; /* NULL, ends rules */
2007 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
2010 alloc *= sizeof(struct nft_rule *);
2011 alloc += sizeof(struct nft_rules_old);
2013 return kvmalloc(alloc, GFP_KERNEL);
2016 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2017 const struct nft_chain_hook *hook,
2018 struct nft_chain *chain)
2021 ops->hooknum = hook->num;
2022 ops->priority = hook->priority;
2024 ops->hook = hook->type->hooks[ops->hooknum];
2025 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
2028 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2029 struct nft_chain_hook *hook, u32 flags)
2031 struct nft_chain *chain;
2034 basechain->type = hook->type;
2035 INIT_LIST_HEAD(&basechain->hook_list);
2036 chain = &basechain->chain;
2038 if (nft_base_chain_netdev(family, hook->num)) {
2039 list_splice_init(&hook->list, &basechain->hook_list);
2040 list_for_each_entry(h, &basechain->hook_list, list)
2041 nft_basechain_hook_init(&h->ops, family, hook, chain);
2043 basechain->ops.hooknum = hook->num;
2044 basechain->ops.priority = hook->priority;
2046 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2049 chain->flags |= NFT_CHAIN_BASE | flags;
2050 basechain->policy = NF_ACCEPT;
2051 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2052 nft_chain_offload_priority(basechain) < 0)
2055 flow_block_init(&basechain->flow_block);
2060 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2064 err = rhltable_insert_key(&table->chains_ht, chain->name,
2065 &chain->rhlhead, nft_chain_ht_params);
2069 list_add_tail_rcu(&chain->list, &table->chains);
2074 static u64 chain_id;
2076 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2077 u8 policy, u32 flags,
2078 struct netlink_ext_ack *extack)
2080 const struct nlattr * const *nla = ctx->nla;
2081 struct nft_table *table = ctx->table;
2082 struct nft_base_chain *basechain;
2083 struct nft_stats __percpu *stats;
2084 struct net *net = ctx->net;
2085 char name[NFT_NAME_MAXLEN];
2086 struct nft_trans *trans;
2087 struct nft_chain *chain;
2088 struct nft_rule **rules;
2091 if (table->use == UINT_MAX)
2094 if (nla[NFTA_CHAIN_HOOK]) {
2095 struct nft_chain_hook hook;
2097 if (flags & NFT_CHAIN_BINDING)
2100 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2105 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
2106 if (basechain == NULL) {
2107 nft_chain_release_hook(&hook);
2110 chain = &basechain->chain;
2112 if (nla[NFTA_CHAIN_COUNTERS]) {
2113 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2114 if (IS_ERR(stats)) {
2115 nft_chain_release_hook(&hook);
2117 return PTR_ERR(stats);
2119 rcu_assign_pointer(basechain->stats, stats);
2120 static_branch_inc(&nft_counters_enabled);
2123 err = nft_basechain_init(basechain, family, &hook, flags);
2125 nft_chain_release_hook(&hook);
2130 if (flags & NFT_CHAIN_BASE)
2132 if (flags & NFT_CHAIN_HW_OFFLOAD)
2135 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2139 chain->flags = flags;
2143 INIT_LIST_HEAD(&chain->rules);
2144 chain->handle = nf_tables_alloc_handle(table);
2145 chain->table = table;
2147 if (nla[NFTA_CHAIN_NAME]) {
2148 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2150 if (!(flags & NFT_CHAIN_BINDING)) {
2152 goto err_destroy_chain;
2155 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2156 chain->name = kstrdup(name, GFP_KERNEL);
2161 goto err_destroy_chain;
2164 if (nla[NFTA_CHAIN_USERDATA]) {
2165 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL);
2166 if (chain->udata == NULL) {
2168 goto err_destroy_chain;
2170 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2173 rules = nf_tables_chain_alloc_rules(chain, 0);
2176 goto err_destroy_chain;
2180 rcu_assign_pointer(chain->rules_gen_0, rules);
2181 rcu_assign_pointer(chain->rules_gen_1, rules);
2183 err = nf_tables_register_hook(net, table, chain);
2185 goto err_destroy_chain;
2187 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2188 if (IS_ERR(trans)) {
2189 err = PTR_ERR(trans);
2190 goto err_unregister_hook;
2193 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2194 if (nft_is_base_chain(chain))
2195 nft_trans_chain_policy(trans) = policy;
2197 err = nft_chain_add(table, chain);
2199 nft_trans_destroy(trans);
2200 goto err_unregister_hook;
2206 err_unregister_hook:
2207 nf_tables_unregister_hook(net, table, chain);
2209 nf_tables_chain_destroy(ctx);
2214 static bool nft_hook_list_equal(struct list_head *hook_list1,
2215 struct list_head *hook_list2)
2217 struct nft_hook *hook;
2221 list_for_each_entry(hook, hook_list2, list) {
2222 if (!nft_hook_list_find(hook_list1, hook))
2227 list_for_each_entry(hook, hook_list1, list)
2233 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2234 u32 flags, const struct nlattr *attr,
2235 struct netlink_ext_ack *extack)
2237 const struct nlattr * const *nla = ctx->nla;
2238 struct nft_table *table = ctx->table;
2239 struct nft_chain *chain = ctx->chain;
2240 struct nft_base_chain *basechain;
2241 struct nft_stats *stats = NULL;
2242 struct nft_chain_hook hook;
2243 struct nf_hook_ops *ops;
2244 struct nft_trans *trans;
2247 if (chain->flags ^ flags)
2250 if (nla[NFTA_CHAIN_HOOK]) {
2251 if (!nft_is_base_chain(chain)) {
2252 NL_SET_BAD_ATTR(extack, attr);
2255 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2260 basechain = nft_base_chain(chain);
2261 if (basechain->type != hook.type) {
2262 nft_chain_release_hook(&hook);
2263 NL_SET_BAD_ATTR(extack, attr);
2267 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2268 if (!nft_hook_list_equal(&basechain->hook_list,
2270 nft_chain_release_hook(&hook);
2271 NL_SET_BAD_ATTR(extack, attr);
2275 ops = &basechain->ops;
2276 if (ops->hooknum != hook.num ||
2277 ops->priority != hook.priority) {
2278 nft_chain_release_hook(&hook);
2279 NL_SET_BAD_ATTR(extack, attr);
2283 nft_chain_release_hook(&hook);
2286 if (nla[NFTA_CHAIN_HANDLE] &&
2287 nla[NFTA_CHAIN_NAME]) {
2288 struct nft_chain *chain2;
2290 chain2 = nft_chain_lookup(ctx->net, table,
2291 nla[NFTA_CHAIN_NAME], genmask);
2292 if (!IS_ERR(chain2)) {
2293 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2298 if (nla[NFTA_CHAIN_COUNTERS]) {
2299 if (!nft_is_base_chain(chain))
2302 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2304 return PTR_ERR(stats);
2308 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2309 sizeof(struct nft_trans_chain));
2313 nft_trans_chain_stats(trans) = stats;
2314 nft_trans_chain_update(trans) = true;
2316 if (nla[NFTA_CHAIN_POLICY])
2317 nft_trans_chain_policy(trans) = policy;
2319 nft_trans_chain_policy(trans) = -1;
2321 if (nla[NFTA_CHAIN_HANDLE] &&
2322 nla[NFTA_CHAIN_NAME]) {
2323 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2324 struct nft_trans *tmp;
2328 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2333 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2334 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2335 tmp->ctx.table == table &&
2336 nft_trans_chain_update(tmp) &&
2337 nft_trans_chain_name(tmp) &&
2338 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2339 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2345 nft_trans_chain_name(trans) = name;
2347 nft_trans_commit_list_add_tail(ctx->net, trans);
2356 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2357 const struct nlattr *nla)
2359 struct nftables_pernet *nft_net = nft_pernet(net);
2360 u32 id = ntohl(nla_get_be32(nla));
2361 struct nft_trans *trans;
2363 list_for_each_entry(trans, &nft_net->commit_list, list) {
2364 struct nft_chain *chain = trans->ctx.chain;
2366 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2367 id == nft_trans_chain_id(trans))
2370 return ERR_PTR(-ENOENT);
2373 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2374 const struct nlattr * const nla[])
2376 struct nftables_pernet *nft_net = nft_pernet(info->net);
2377 struct netlink_ext_ack *extack = info->extack;
2378 u8 genmask = nft_genmask_next(info->net);
2379 u8 family = info->nfmsg->nfgen_family;
2380 struct nft_chain *chain = NULL;
2381 struct net *net = info->net;
2382 const struct nlattr *attr;
2383 struct nft_table *table;
2384 u8 policy = NF_ACCEPT;
2389 lockdep_assert_held(&nft_net->commit_mutex);
2391 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2392 NETLINK_CB(skb).portid);
2393 if (IS_ERR(table)) {
2394 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2395 return PTR_ERR(table);
2399 attr = nla[NFTA_CHAIN_NAME];
2401 if (nla[NFTA_CHAIN_HANDLE]) {
2402 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2403 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2404 if (IS_ERR(chain)) {
2405 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2406 return PTR_ERR(chain);
2408 attr = nla[NFTA_CHAIN_HANDLE];
2409 } else if (nla[NFTA_CHAIN_NAME]) {
2410 chain = nft_chain_lookup(net, table, attr, genmask);
2411 if (IS_ERR(chain)) {
2412 if (PTR_ERR(chain) != -ENOENT) {
2413 NL_SET_BAD_ATTR(extack, attr);
2414 return PTR_ERR(chain);
2418 } else if (!nla[NFTA_CHAIN_ID]) {
2422 if (nla[NFTA_CHAIN_POLICY]) {
2423 if (chain != NULL &&
2424 !nft_is_base_chain(chain)) {
2425 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2429 if (chain == NULL &&
2430 nla[NFTA_CHAIN_HOOK] == NULL) {
2431 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2435 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2445 if (nla[NFTA_CHAIN_FLAGS])
2446 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2448 flags = chain->flags;
2450 if (flags & ~NFT_CHAIN_FLAGS)
2453 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2455 if (chain != NULL) {
2456 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2457 NL_SET_BAD_ATTR(extack, attr);
2460 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2463 flags |= chain->flags & NFT_CHAIN_BASE;
2464 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2468 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2471 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2472 const struct nlattr * const nla[])
2474 struct netlink_ext_ack *extack = info->extack;
2475 u8 genmask = nft_genmask_next(info->net);
2476 u8 family = info->nfmsg->nfgen_family;
2477 struct net *net = info->net;
2478 const struct nlattr *attr;
2479 struct nft_table *table;
2480 struct nft_chain *chain;
2481 struct nft_rule *rule;
2487 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2488 NETLINK_CB(skb).portid);
2489 if (IS_ERR(table)) {
2490 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2491 return PTR_ERR(table);
2494 if (nla[NFTA_CHAIN_HANDLE]) {
2495 attr = nla[NFTA_CHAIN_HANDLE];
2496 handle = be64_to_cpu(nla_get_be64(attr));
2497 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2499 attr = nla[NFTA_CHAIN_NAME];
2500 chain = nft_chain_lookup(net, table, attr, genmask);
2502 if (IS_ERR(chain)) {
2503 NL_SET_BAD_ATTR(extack, attr);
2504 return PTR_ERR(chain);
2507 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2511 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2514 list_for_each_entry(rule, &chain->rules, list) {
2515 if (!nft_is_active_next(net, rule))
2519 err = nft_delrule(&ctx, rule);
2524 /* There are rules and elements that are still holding references to us,
2525 * we cannot do a recursive removal in this case.
2528 NL_SET_BAD_ATTR(extack, attr);
2532 return nft_delchain(&ctx);
2540 * nft_register_expr - register nf_tables expr type
2543 * Registers the expr type for use with nf_tables. Returns zero on
2544 * success or a negative errno code otherwise.
2546 int nft_register_expr(struct nft_expr_type *type)
2548 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2549 if (type->family == NFPROTO_UNSPEC)
2550 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2552 list_add_rcu(&type->list, &nf_tables_expressions);
2553 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2556 EXPORT_SYMBOL_GPL(nft_register_expr);
2559 * nft_unregister_expr - unregister nf_tables expr type
2562 * Unregisters the expr typefor use with nf_tables.
2564 void nft_unregister_expr(struct nft_expr_type *type)
2566 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2567 list_del_rcu(&type->list);
2568 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2570 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2572 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2575 const struct nft_expr_type *type, *candidate = NULL;
2577 list_for_each_entry(type, &nf_tables_expressions, list) {
2578 if (!nla_strcmp(nla, type->name)) {
2579 if (!type->family && !candidate)
2581 else if (type->family == family)
2588 #ifdef CONFIG_MODULES
2589 static int nft_expr_type_request_module(struct net *net, u8 family,
2592 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2593 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2600 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2604 const struct nft_expr_type *type;
2607 return ERR_PTR(-EINVAL);
2609 type = __nft_expr_type_get(family, nla);
2610 if (type != NULL && try_module_get(type->owner))
2613 lockdep_nfnl_nft_mutex_not_held();
2614 #ifdef CONFIG_MODULES
2616 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2617 return ERR_PTR(-EAGAIN);
2619 if (nft_request_module(net, "nft-expr-%.*s",
2621 (char *)nla_data(nla)) == -EAGAIN)
2622 return ERR_PTR(-EAGAIN);
2625 return ERR_PTR(-ENOENT);
2628 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2629 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2630 .len = NFT_MODULE_AUTOLOAD_LIMIT },
2631 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2634 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2635 const struct nft_expr *expr)
2637 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2638 goto nla_put_failure;
2640 if (expr->ops->dump) {
2641 struct nlattr *data = nla_nest_start_noflag(skb,
2644 goto nla_put_failure;
2645 if (expr->ops->dump(skb, expr) < 0)
2646 goto nla_put_failure;
2647 nla_nest_end(skb, data);
2656 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2657 const struct nft_expr *expr)
2659 struct nlattr *nest;
2661 nest = nla_nest_start_noflag(skb, attr);
2663 goto nla_put_failure;
2664 if (nf_tables_fill_expr_info(skb, expr) < 0)
2665 goto nla_put_failure;
2666 nla_nest_end(skb, nest);
2673 struct nft_expr_info {
2674 const struct nft_expr_ops *ops;
2675 const struct nlattr *attr;
2676 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2679 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2680 const struct nlattr *nla,
2681 struct nft_expr_info *info)
2683 const struct nft_expr_type *type;
2684 const struct nft_expr_ops *ops;
2685 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2688 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2689 nft_expr_policy, NULL);
2693 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2695 return PTR_ERR(type);
2697 if (tb[NFTA_EXPR_DATA]) {
2698 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2700 type->policy, NULL);
2704 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2706 if (type->select_ops != NULL) {
2707 ops = type->select_ops(ctx,
2708 (const struct nlattr * const *)info->tb);
2711 #ifdef CONFIG_MODULES
2713 if (nft_expr_type_request_module(ctx->net,
2715 tb[NFTA_EXPR_NAME]) != -EAGAIN)
2729 module_put(type->owner);
2733 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2734 const struct nft_expr_info *expr_info,
2735 struct nft_expr *expr)
2737 const struct nft_expr_ops *ops = expr_info->ops;
2742 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2753 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2754 struct nft_expr *expr)
2756 const struct nft_expr_type *type = expr->ops->type;
2758 if (expr->ops->destroy)
2759 expr->ops->destroy(ctx, expr);
2760 module_put(type->owner);
2763 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2764 const struct nlattr *nla)
2766 struct nft_expr_info expr_info;
2767 struct nft_expr *expr;
2768 struct module *owner;
2771 err = nf_tables_expr_parse(ctx, nla, &expr_info);
2776 expr = kzalloc(expr_info.ops->size, GFP_KERNEL);
2780 err = nf_tables_newexpr(ctx, &expr_info, expr);
2788 owner = expr_info.ops->type->owner;
2789 if (expr_info.ops->type->release_ops)
2790 expr_info.ops->type->release_ops(expr_info.ops);
2794 return ERR_PTR(err);
2797 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2801 if (src->ops->clone) {
2802 dst->ops = src->ops;
2803 err = src->ops->clone(dst, src);
2807 memcpy(dst, src, src->ops->size);
2810 __module_get(src->ops->type->owner);
2815 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2817 nf_tables_expr_destroy(ctx, expr);
2825 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2828 struct nft_rule *rule;
2830 // FIXME: this sucks
2831 list_for_each_entry_rcu(rule, &chain->rules, list) {
2832 if (handle == rule->handle)
2836 return ERR_PTR(-ENOENT);
2839 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2840 const struct nlattr *nla)
2843 return ERR_PTR(-EINVAL);
2845 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2848 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2849 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2850 .len = NFT_TABLE_MAXNAMELEN - 1 },
2851 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2852 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2853 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2854 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2855 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2856 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2857 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2858 .len = NFT_USERDATA_MAXLEN },
2859 [NFTA_RULE_ID] = { .type = NLA_U32 },
2860 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2861 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
2864 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2865 u32 portid, u32 seq, int event,
2866 u32 flags, int family,
2867 const struct nft_table *table,
2868 const struct nft_chain *chain,
2869 const struct nft_rule *rule,
2870 const struct nft_rule *prule)
2872 struct nlmsghdr *nlh;
2873 const struct nft_expr *expr, *next;
2874 struct nlattr *list;
2875 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2877 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
2880 goto nla_put_failure;
2882 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2883 goto nla_put_failure;
2884 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2885 goto nla_put_failure;
2886 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2888 goto nla_put_failure;
2890 if (event != NFT_MSG_DELRULE && prule) {
2891 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2892 cpu_to_be64(prule->handle),
2894 goto nla_put_failure;
2897 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2898 nft_flow_rule_stats(chain, rule);
2900 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2902 goto nla_put_failure;
2903 nft_rule_for_each_expr(expr, next, rule) {
2904 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2905 goto nla_put_failure;
2907 nla_nest_end(skb, list);
2910 struct nft_userdata *udata = nft_userdata(rule);
2911 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2913 goto nla_put_failure;
2916 nlmsg_end(skb, nlh);
2920 nlmsg_trim(skb, nlh);
2924 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2925 const struct nft_rule *rule, int event)
2927 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2928 struct sk_buff *skb;
2932 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2935 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2939 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2940 event, 0, ctx->family, ctx->table,
2941 ctx->chain, rule, NULL);
2947 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
2950 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2953 struct nft_rule_dump_ctx {
2958 static int __nf_tables_dump_rules(struct sk_buff *skb,
2960 struct netlink_callback *cb,
2961 const struct nft_table *table,
2962 const struct nft_chain *chain)
2964 struct net *net = sock_net(skb->sk);
2965 const struct nft_rule *rule, *prule;
2966 unsigned int s_idx = cb->args[0];
2969 list_for_each_entry_rcu(rule, &chain->rules, list) {
2970 if (!nft_is_active(net, rule))
2975 memset(&cb->args[1], 0,
2976 sizeof(cb->args) - sizeof(cb->args[0]));
2978 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2981 NLM_F_MULTI | NLM_F_APPEND,
2983 table, chain, rule, prule) < 0)
2986 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2995 static int nf_tables_dump_rules(struct sk_buff *skb,
2996 struct netlink_callback *cb)
2998 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2999 const struct nft_rule_dump_ctx *ctx = cb->data;
3000 struct nft_table *table;
3001 const struct nft_chain *chain;
3002 unsigned int idx = 0;
3003 struct net *net = sock_net(skb->sk);
3004 int family = nfmsg->nfgen_family;
3005 struct nftables_pernet *nft_net;
3008 nft_net = nft_pernet(net);
3009 cb->seq = nft_net->base_seq;
3011 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3012 if (family != NFPROTO_UNSPEC && family != table->family)
3015 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3018 if (ctx && ctx->table && ctx->chain) {
3019 struct rhlist_head *list, *tmp;
3021 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3022 nft_chain_ht_params);
3026 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3027 if (!nft_is_active(net, chain))
3029 __nf_tables_dump_rules(skb, &idx,
3036 list_for_each_entry_rcu(chain, &table->chains, list) {
3037 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
3041 if (ctx && ctx->table)
3051 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3053 const struct nlattr * const *nla = cb->data;
3054 struct nft_rule_dump_ctx *ctx = NULL;
3056 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3057 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3061 if (nla[NFTA_RULE_TABLE]) {
3062 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3069 if (nla[NFTA_RULE_CHAIN]) {
3070 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3084 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3086 struct nft_rule_dump_ctx *ctx = cb->data;
3096 /* called with rcu_read_lock held */
3097 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3098 const struct nlattr * const nla[])
3100 struct netlink_ext_ack *extack = info->extack;
3101 u8 genmask = nft_genmask_cur(info->net);
3102 u8 family = info->nfmsg->nfgen_family;
3103 const struct nft_chain *chain;
3104 const struct nft_rule *rule;
3105 struct net *net = info->net;
3106 struct nft_table *table;
3107 struct sk_buff *skb2;
3110 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3111 struct netlink_dump_control c = {
3112 .start= nf_tables_dump_rules_start,
3113 .dump = nf_tables_dump_rules,
3114 .done = nf_tables_dump_rules_done,
3115 .module = THIS_MODULE,
3116 .data = (void *)nla,
3119 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3122 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3123 if (IS_ERR(table)) {
3124 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3125 return PTR_ERR(table);
3128 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3129 if (IS_ERR(chain)) {
3130 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3131 return PTR_ERR(chain);
3134 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3136 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3137 return PTR_ERR(rule);
3140 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3144 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3145 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3146 family, table, chain, rule, NULL);
3148 goto err_fill_rule_info;
3150 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3157 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3158 struct nft_rule *rule)
3160 struct nft_expr *expr, *next;
3163 * Careful: some expressions might not be initialized in case this
3164 * is called on error from nf_tables_newrule().
3166 expr = nft_expr_first(rule);
3167 while (nft_expr_more(rule, expr)) {
3168 next = nft_expr_next(expr);
3169 nf_tables_expr_destroy(ctx, expr);
3175 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3177 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3178 nf_tables_rule_destroy(ctx, rule);
3181 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3183 struct nft_expr *expr, *last;
3184 const struct nft_data *data;
3185 struct nft_rule *rule;
3188 if (ctx->level == NFT_JUMP_STACK_SIZE)
3191 list_for_each_entry(rule, &chain->rules, list) {
3192 if (!nft_is_active_next(ctx->net, rule))
3195 nft_rule_for_each_expr(expr, last, rule) {
3196 if (!expr->ops->validate)
3199 err = expr->ops->validate(ctx, expr, &data);
3207 EXPORT_SYMBOL_GPL(nft_chain_validate);
3209 static int nft_table_validate(struct net *net, const struct nft_table *table)
3211 struct nft_chain *chain;
3212 struct nft_ctx ctx = {
3214 .family = table->family,
3218 list_for_each_entry(chain, &table->chains, list) {
3219 if (!nft_is_base_chain(chain))
3223 err = nft_chain_validate(&ctx, chain);
3231 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3232 const struct nlattr *nla);
3234 #define NFT_RULE_MAXEXPRS 128
3236 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3237 const struct nlattr * const nla[])
3239 struct nftables_pernet *nft_net = nft_pernet(info->net);
3240 struct netlink_ext_ack *extack = info->extack;
3241 unsigned int size, i, n, ulen = 0, usize = 0;
3242 u8 genmask = nft_genmask_next(info->net);
3243 struct nft_rule *rule, *old_rule = NULL;
3244 struct nft_expr_info *expr_info = NULL;
3245 u8 family = info->nfmsg->nfgen_family;
3246 struct nft_flow_rule *flow = NULL;
3247 struct net *net = info->net;
3248 struct nft_userdata *udata;
3249 struct nft_table *table;
3250 struct nft_chain *chain;
3251 struct nft_trans *trans;
3252 u64 handle, pos_handle;
3253 struct nft_expr *expr;
3258 lockdep_assert_held(&nft_net->commit_mutex);
3260 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3261 NETLINK_CB(skb).portid);
3262 if (IS_ERR(table)) {
3263 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3264 return PTR_ERR(table);
3267 if (nla[NFTA_RULE_CHAIN]) {
3268 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3270 if (IS_ERR(chain)) {
3271 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3272 return PTR_ERR(chain);
3274 if (nft_chain_is_bound(chain))
3277 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3278 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3279 if (IS_ERR(chain)) {
3280 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3281 return PTR_ERR(chain);
3287 if (nla[NFTA_RULE_HANDLE]) {
3288 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3289 rule = __nft_rule_lookup(chain, handle);
3291 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3292 return PTR_ERR(rule);
3295 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3296 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3299 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3304 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3305 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3307 handle = nf_tables_alloc_handle(table);
3309 if (chain->use == UINT_MAX)
3312 if (nla[NFTA_RULE_POSITION]) {
3313 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3314 old_rule = __nft_rule_lookup(chain, pos_handle);
3315 if (IS_ERR(old_rule)) {
3316 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3317 return PTR_ERR(old_rule);
3319 } else if (nla[NFTA_RULE_POSITION_ID]) {
3320 old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3321 if (IS_ERR(old_rule)) {
3322 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3323 return PTR_ERR(old_rule);
3328 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3332 if (nla[NFTA_RULE_EXPRESSIONS]) {
3333 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3334 sizeof(struct nft_expr_info),
3339 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3341 if (nla_type(tmp) != NFTA_LIST_ELEM)
3342 goto err_release_expr;
3343 if (n == NFT_RULE_MAXEXPRS)
3344 goto err_release_expr;
3345 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3347 NL_SET_BAD_ATTR(extack, tmp);
3348 goto err_release_expr;
3350 size += expr_info[n].ops->size;
3354 /* Check for overflow of dlen field */
3356 if (size >= 1 << 12)
3357 goto err_release_expr;
3359 if (nla[NFTA_RULE_USERDATA]) {
3360 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3362 usize = sizeof(struct nft_userdata) + ulen;
3366 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3368 goto err_release_expr;
3370 nft_activate_next(net, rule);
3372 rule->handle = handle;
3374 rule->udata = ulen ? 1 : 0;
3377 udata = nft_userdata(rule);
3378 udata->len = ulen - 1;
3379 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3382 expr = nft_expr_first(rule);
3383 for (i = 0; i < n; i++) {
3384 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3386 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3387 goto err_release_rule;
3390 if (expr_info[i].ops->validate)
3391 nft_validate_state_update(net, NFT_VALIDATE_NEED);
3393 expr_info[i].ops = NULL;
3394 expr = nft_expr_next(expr);
3397 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3398 flow = nft_flow_rule_create(net, rule);
3400 err = PTR_ERR(flow);
3401 goto err_release_rule;
3405 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3406 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3407 if (trans == NULL) {
3409 goto err_destroy_flow_rule;
3411 err = nft_delrule(&ctx, old_rule);
3413 nft_trans_destroy(trans);
3414 goto err_destroy_flow_rule;
3417 list_add_tail_rcu(&rule->list, &old_rule->list);
3419 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3422 goto err_destroy_flow_rule;
3425 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3427 list_add_rcu(&rule->list, &old_rule->list);
3429 list_add_tail_rcu(&rule->list, &chain->rules);
3432 list_add_tail_rcu(&rule->list, &old_rule->list);
3434 list_add_rcu(&rule->list, &chain->rules);
3441 nft_trans_flow_rule(trans) = flow;
3443 if (nft_net->validate_state == NFT_VALIDATE_DO)
3444 return nft_table_validate(net, table);
3448 err_destroy_flow_rule:
3449 nft_flow_rule_destroy(flow);
3451 nf_tables_rule_release(&ctx, rule);
3453 for (i = 0; i < n; i++) {
3454 if (expr_info[i].ops) {
3455 module_put(expr_info[i].ops->type->owner);
3456 if (expr_info[i].ops->type->release_ops)
3457 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3465 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3466 const struct nlattr *nla)
3468 struct nftables_pernet *nft_net = nft_pernet(net);
3469 u32 id = ntohl(nla_get_be32(nla));
3470 struct nft_trans *trans;
3472 list_for_each_entry(trans, &nft_net->commit_list, list) {
3473 struct nft_rule *rule = nft_trans_rule(trans);
3475 if (trans->msg_type == NFT_MSG_NEWRULE &&
3476 id == nft_trans_rule_id(trans))
3479 return ERR_PTR(-ENOENT);
3482 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3483 const struct nlattr * const nla[])
3485 struct netlink_ext_ack *extack = info->extack;
3486 u8 genmask = nft_genmask_next(info->net);
3487 u8 family = info->nfmsg->nfgen_family;
3488 struct nft_chain *chain = NULL;
3489 struct net *net = info->net;
3490 struct nft_table *table;
3491 struct nft_rule *rule;
3495 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3496 NETLINK_CB(skb).portid);
3497 if (IS_ERR(table)) {
3498 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3499 return PTR_ERR(table);
3502 if (nla[NFTA_RULE_CHAIN]) {
3503 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3505 if (IS_ERR(chain)) {
3506 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3507 return PTR_ERR(chain);
3509 if (nft_chain_is_bound(chain))
3513 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3516 if (nla[NFTA_RULE_HANDLE]) {
3517 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3519 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3520 return PTR_ERR(rule);
3523 err = nft_delrule(&ctx, rule);
3524 } else if (nla[NFTA_RULE_ID]) {
3525 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3527 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3528 return PTR_ERR(rule);
3531 err = nft_delrule(&ctx, rule);
3533 err = nft_delrule_by_chain(&ctx);
3536 list_for_each_entry(chain, &table->chains, list) {
3537 if (!nft_is_active_next(net, chain))
3541 err = nft_delrule_by_chain(&ctx);
3553 static const struct nft_set_type *nft_set_types[] = {
3554 &nft_set_hash_fast_type,
3556 &nft_set_rhash_type,
3557 &nft_set_bitmap_type,
3558 &nft_set_rbtree_type,
3559 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3560 &nft_set_pipapo_avx2_type,
3562 &nft_set_pipapo_type,
3565 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
3566 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3569 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3571 return (flags & type->features) == (flags & NFT_SET_FEATURES);
3575 * Select a set implementation based on the data characteristics and the
3576 * given policy. The total memory use might not be known if no size is
3577 * given, in that case the amount of memory per element is used.
3579 static const struct nft_set_ops *
3580 nft_select_set_ops(const struct nft_ctx *ctx,
3581 const struct nlattr * const nla[],
3582 const struct nft_set_desc *desc,
3583 enum nft_set_policies policy)
3585 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3586 const struct nft_set_ops *ops, *bops;
3587 struct nft_set_estimate est, best;
3588 const struct nft_set_type *type;
3592 lockdep_assert_held(&nft_net->commit_mutex);
3593 lockdep_nfnl_nft_mutex_not_held();
3595 if (nla[NFTA_SET_FLAGS] != NULL)
3596 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3603 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3604 type = nft_set_types[i];
3607 if (!nft_set_ops_candidate(type, flags))
3609 if (!ops->estimate(desc, flags, &est))
3613 case NFT_SET_POL_PERFORMANCE:
3614 if (est.lookup < best.lookup)
3616 if (est.lookup == best.lookup &&
3617 est.space < best.space)
3620 case NFT_SET_POL_MEMORY:
3622 if (est.space < best.space)
3624 if (est.space == best.space &&
3625 est.lookup < best.lookup)
3627 } else if (est.size < best.size || !bops) {
3642 return ERR_PTR(-EOPNOTSUPP);
3645 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3646 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3647 .len = NFT_TABLE_MAXNAMELEN - 1 },
3648 [NFTA_SET_NAME] = { .type = NLA_STRING,
3649 .len = NFT_SET_MAXNAMELEN - 1 },
3650 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3651 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3652 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3653 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3654 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
3655 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3656 [NFTA_SET_DESC] = { .type = NLA_NESTED },
3657 [NFTA_SET_ID] = { .type = NLA_U32 },
3658 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3659 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
3660 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3661 .len = NFT_USERDATA_MAXLEN },
3662 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3663 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
3664 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
3665 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
3668 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3669 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
3670 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
3673 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3674 const struct nlattr *nla, u8 genmask)
3676 struct nft_set *set;
3679 return ERR_PTR(-EINVAL);
3681 list_for_each_entry_rcu(set, &table->sets, list) {
3682 if (!nla_strcmp(nla, set->name) &&
3683 nft_active_genmask(set, genmask))
3686 return ERR_PTR(-ENOENT);
3689 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3690 const struct nlattr *nla,
3693 struct nft_set *set;
3695 list_for_each_entry(set, &table->sets, list) {
3696 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3697 nft_active_genmask(set, genmask))
3700 return ERR_PTR(-ENOENT);
3703 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3704 const struct nlattr *nla, u8 genmask)
3706 struct nftables_pernet *nft_net = nft_pernet(net);
3707 u32 id = ntohl(nla_get_be32(nla));
3708 struct nft_trans *trans;
3710 list_for_each_entry(trans, &nft_net->commit_list, list) {
3711 if (trans->msg_type == NFT_MSG_NEWSET) {
3712 struct nft_set *set = nft_trans_set(trans);
3714 if (id == nft_trans_set_id(trans) &&
3715 nft_active_genmask(set, genmask))
3719 return ERR_PTR(-ENOENT);
3722 struct nft_set *nft_set_lookup_global(const struct net *net,
3723 const struct nft_table *table,
3724 const struct nlattr *nla_set_name,
3725 const struct nlattr *nla_set_id,
3728 struct nft_set *set;
3730 set = nft_set_lookup(table, nla_set_name, genmask);
3735 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3739 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3741 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3744 const struct nft_set *i;
3746 unsigned long *inuse;
3747 unsigned int n = 0, min = 0;
3749 p = strchr(name, '%');
3751 if (p[1] != 'd' || strchr(p + 2, '%'))
3754 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3758 list_for_each_entry(i, &ctx->table->sets, list) {
3761 if (!nft_is_active_next(ctx->net, set))
3763 if (!sscanf(i->name, name, &tmp))
3765 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3768 set_bit(tmp - min, inuse);
3771 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3772 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3773 min += BITS_PER_BYTE * PAGE_SIZE;
3774 memset(inuse, 0, PAGE_SIZE);
3777 free_page((unsigned long)inuse);
3780 set->name = kasprintf(GFP_KERNEL, name, min + n);
3784 list_for_each_entry(i, &ctx->table->sets, list) {
3785 if (!nft_is_active_next(ctx->net, i))
3787 if (!strcmp(set->name, i->name)) {
3796 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3798 u64 ms = be64_to_cpu(nla_get_be64(nla));
3799 u64 max = (u64)(~((u64)0));
3801 max = div_u64(max, NSEC_PER_MSEC);
3805 ms *= NSEC_PER_MSEC;
3806 *result = nsecs_to_jiffies64(ms);
3810 __be64 nf_jiffies64_to_msecs(u64 input)
3812 return cpu_to_be64(jiffies64_to_msecs(input));
3815 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3816 const struct nft_set *set)
3818 struct nlattr *concat, *field;
3821 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3825 for (i = 0; i < set->field_count; i++) {
3826 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3830 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3831 htonl(set->field_len[i])))
3834 nla_nest_end(skb, field);
3837 nla_nest_end(skb, concat);
3842 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3843 const struct nft_set *set, u16 event, u16 flags)
3845 struct nlmsghdr *nlh;
3846 u32 portid = ctx->portid;
3847 struct nlattr *nest;
3851 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3852 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
3853 NFNETLINK_V0, nft_base_seq(ctx->net));
3855 goto nla_put_failure;
3857 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3858 goto nla_put_failure;
3859 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3860 goto nla_put_failure;
3861 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3863 goto nla_put_failure;
3864 if (set->flags != 0)
3865 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3866 goto nla_put_failure;
3868 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3869 goto nla_put_failure;
3870 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3871 goto nla_put_failure;
3872 if (set->flags & NFT_SET_MAP) {
3873 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3874 goto nla_put_failure;
3875 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3876 goto nla_put_failure;
3878 if (set->flags & NFT_SET_OBJECT &&
3879 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3880 goto nla_put_failure;
3883 nla_put_be64(skb, NFTA_SET_TIMEOUT,
3884 nf_jiffies64_to_msecs(set->timeout),
3886 goto nla_put_failure;
3888 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3889 goto nla_put_failure;
3891 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3892 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3893 goto nla_put_failure;
3897 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3898 goto nla_put_failure;
3900 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3902 goto nla_put_failure;
3904 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3905 goto nla_put_failure;
3907 if (set->field_count > 1 &&
3908 nf_tables_fill_set_concat(skb, set))
3909 goto nla_put_failure;
3911 nla_nest_end(skb, nest);
3913 if (set->num_exprs == 1) {
3914 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3915 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
3916 goto nla_put_failure;
3918 nla_nest_end(skb, nest);
3919 } else if (set->num_exprs > 1) {
3920 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
3922 goto nla_put_failure;
3924 for (i = 0; i < set->num_exprs; i++) {
3925 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
3927 goto nla_put_failure;
3929 nla_nest_end(skb, nest);
3932 nlmsg_end(skb, nlh);
3936 nlmsg_trim(skb, nlh);
3940 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3941 const struct nft_set *set, int event,
3944 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3945 struct sk_buff *skb;
3946 u32 portid = ctx->portid;
3950 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3953 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3957 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3963 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3966 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3969 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3971 const struct nft_set *set;
3972 unsigned int idx, s_idx = cb->args[0];
3973 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3974 struct net *net = sock_net(skb->sk);
3975 struct nft_ctx *ctx = cb->data, ctx_set;
3976 struct nftables_pernet *nft_net;
3982 nft_net = nft_pernet(net);
3983 cb->seq = nft_net->base_seq;
3985 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3986 if (ctx->family != NFPROTO_UNSPEC &&
3987 ctx->family != table->family)
3990 if (ctx->table && ctx->table != table)
3994 if (cur_table != table)
4000 list_for_each_entry_rcu(set, &table->sets, list) {
4003 if (!nft_is_active(net, set))
4007 ctx_set.table = table;
4008 ctx_set.family = table->family;
4010 if (nf_tables_fill_set(skb, &ctx_set, set,
4014 cb->args[2] = (unsigned long) table;
4017 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4030 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4032 struct nft_ctx *ctx_dump = NULL;
4034 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4035 if (ctx_dump == NULL)
4038 cb->data = ctx_dump;
4042 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4048 /* called with rcu_read_lock held */
4049 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4050 const struct nlattr * const nla[])
4052 struct netlink_ext_ack *extack = info->extack;
4053 u8 genmask = nft_genmask_cur(info->net);
4054 u8 family = info->nfmsg->nfgen_family;
4055 struct nft_table *table = NULL;
4056 struct net *net = info->net;
4057 const struct nft_set *set;
4058 struct sk_buff *skb2;
4062 if (nla[NFTA_SET_TABLE]) {
4063 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4065 if (IS_ERR(table)) {
4066 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4067 return PTR_ERR(table);
4071 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4073 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4074 struct netlink_dump_control c = {
4075 .start = nf_tables_dump_sets_start,
4076 .dump = nf_tables_dump_sets,
4077 .done = nf_tables_dump_sets_done,
4079 .module = THIS_MODULE,
4082 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4085 /* Only accept unspec with dump */
4086 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4087 return -EAFNOSUPPORT;
4088 if (!nla[NFTA_SET_TABLE])
4091 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4093 return PTR_ERR(set);
4095 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4099 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4101 goto err_fill_set_info;
4103 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4110 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4111 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4114 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4115 struct nft_set_desc *desc)
4117 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4121 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4122 nft_concat_policy, NULL);
4126 if (!tb[NFTA_SET_FIELD_LEN])
4129 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4131 if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
4134 desc->field_len[desc->field_count++] = len;
4139 static int nft_set_desc_concat(struct nft_set_desc *desc,
4140 const struct nlattr *nla)
4142 struct nlattr *attr;
4145 nla_for_each_nested(attr, nla, rem) {
4146 if (nla_type(attr) != NFTA_LIST_ELEM)
4149 err = nft_set_desc_concat_parse(attr, desc);
4157 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4158 const struct nlattr *nla)
4160 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4163 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4164 nft_set_desc_policy, NULL);
4168 if (da[NFTA_SET_DESC_SIZE] != NULL)
4169 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4170 if (da[NFTA_SET_DESC_CONCAT])
4171 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4176 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4177 const struct nlattr * const nla[])
4179 u32 ktype, dtype, flags, policy, gc_int, objtype;
4180 struct netlink_ext_ack *extack = info->extack;
4181 u8 genmask = nft_genmask_next(info->net);
4182 u8 family = info->nfmsg->nfgen_family;
4183 const struct nft_set_ops *ops;
4184 struct nft_expr *expr = NULL;
4185 struct net *net = info->net;
4186 struct nft_set_desc desc;
4187 struct nft_table *table;
4188 unsigned char *udata;
4189 struct nft_set *set;
4198 if (nla[NFTA_SET_TABLE] == NULL ||
4199 nla[NFTA_SET_NAME] == NULL ||
4200 nla[NFTA_SET_KEY_LEN] == NULL ||
4201 nla[NFTA_SET_ID] == NULL)
4204 memset(&desc, 0, sizeof(desc));
4206 ktype = NFT_DATA_VALUE;
4207 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4208 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4209 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4213 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4214 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4218 if (nla[NFTA_SET_FLAGS] != NULL) {
4219 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4220 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4221 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4222 NFT_SET_MAP | NFT_SET_EVAL |
4223 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4225 /* Only one of these operations is supported */
4226 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4227 (NFT_SET_MAP | NFT_SET_OBJECT))
4229 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4230 (NFT_SET_EVAL | NFT_SET_OBJECT))
4235 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4236 if (!(flags & NFT_SET_MAP))
4239 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4240 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4241 dtype != NFT_DATA_VERDICT)
4244 if (dtype != NFT_DATA_VERDICT) {
4245 if (nla[NFTA_SET_DATA_LEN] == NULL)
4247 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4248 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4251 desc.dlen = sizeof(struct nft_verdict);
4252 } else if (flags & NFT_SET_MAP)
4255 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4256 if (!(flags & NFT_SET_OBJECT))
4259 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4260 if (objtype == NFT_OBJECT_UNSPEC ||
4261 objtype > NFT_OBJECT_MAX)
4263 } else if (flags & NFT_SET_OBJECT)
4266 objtype = NFT_OBJECT_UNSPEC;
4269 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4270 if (!(flags & NFT_SET_TIMEOUT))
4273 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4278 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4279 if (!(flags & NFT_SET_TIMEOUT))
4281 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4284 policy = NFT_SET_POL_PERFORMANCE;
4285 if (nla[NFTA_SET_POLICY] != NULL)
4286 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4288 if (nla[NFTA_SET_DESC] != NULL) {
4289 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4294 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4297 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4298 NETLINK_CB(skb).portid);
4299 if (IS_ERR(table)) {
4300 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4301 return PTR_ERR(table);
4304 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4306 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4308 if (PTR_ERR(set) != -ENOENT) {
4309 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4310 return PTR_ERR(set);
4313 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4314 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4317 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4323 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4326 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4328 return PTR_ERR(ops);
4331 if (nla[NFTA_SET_USERDATA])
4332 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4335 if (ops->privsize != NULL)
4336 size = ops->privsize(nla, &desc);
4337 alloc_size = sizeof(*set) + size + udlen;
4338 if (alloc_size < size)
4340 set = kvzalloc(alloc_size, GFP_KERNEL);
4344 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4350 err = nf_tables_set_alloc_name(&ctx, set, name);
4357 udata = set->data + size;
4358 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4361 INIT_LIST_HEAD(&set->bindings);
4362 INIT_LIST_HEAD(&set->catchall_list);
4364 write_pnet(&set->net, net);
4367 set->klen = desc.klen;
4369 set->objtype = objtype;
4370 set->dlen = desc.dlen;
4372 set->size = desc.size;
4373 set->policy = policy;
4376 set->timeout = timeout;
4377 set->gc_int = gc_int;
4379 set->field_count = desc.field_count;
4380 for (i = 0; i < desc.field_count; i++)
4381 set->field_len[i] = desc.field_len[i];
4383 err = ops->init(set, &desc, nla);
4387 if (nla[NFTA_SET_EXPR]) {
4388 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4390 err = PTR_ERR(expr);
4391 goto err_set_expr_alloc;
4393 set->exprs[0] = expr;
4395 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4396 struct nft_expr *expr;
4400 if (!(flags & NFT_SET_EXPR)) {
4402 goto err_set_expr_alloc;
4405 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4406 if (i == NFT_SET_EXPR_MAX) {
4408 goto err_set_expr_alloc;
4410 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4412 goto err_set_expr_alloc;
4414 expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
4416 err = PTR_ERR(expr);
4417 goto err_set_expr_alloc;
4419 set->exprs[i++] = expr;
4424 set->handle = nf_tables_alloc_handle(table);
4426 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4428 goto err_set_expr_alloc;
4430 list_add_tail_rcu(&set->list, &table->sets);
4435 for (i = 0; i < set->num_exprs; i++)
4436 nft_expr_destroy(&ctx, set->exprs[i]);
4446 struct nft_set_elem_catchall {
4447 struct list_head list;
4448 struct rcu_head rcu;
4452 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4453 struct nft_set *set)
4455 struct nft_set_elem_catchall *catchall;
4457 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4458 list_del_rcu(&catchall->list);
4459 nft_set_elem_destroy(set, catchall->elem, true);
4460 kfree_rcu(catchall);
4464 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4468 if (WARN_ON(set->use > 0))
4471 for (i = 0; i < set->num_exprs; i++)
4472 nft_expr_destroy(ctx, set->exprs[i]);
4474 set->ops->destroy(set);
4475 nft_set_catchall_destroy(ctx, set);
4480 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4481 const struct nlattr * const nla[])
4483 struct netlink_ext_ack *extack = info->extack;
4484 u8 genmask = nft_genmask_next(info->net);
4485 u8 family = info->nfmsg->nfgen_family;
4486 struct net *net = info->net;
4487 const struct nlattr *attr;
4488 struct nft_table *table;
4489 struct nft_set *set;
4492 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4493 return -EAFNOSUPPORT;
4495 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4496 genmask, NETLINK_CB(skb).portid);
4497 if (IS_ERR(table)) {
4498 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4499 return PTR_ERR(table);
4502 if (nla[NFTA_SET_HANDLE]) {
4503 attr = nla[NFTA_SET_HANDLE];
4504 set = nft_set_lookup_byhandle(table, attr, genmask);
4506 attr = nla[NFTA_SET_NAME];
4507 set = nft_set_lookup(table, attr, genmask);
4511 NL_SET_BAD_ATTR(extack, attr);
4512 return PTR_ERR(set);
4515 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4516 atomic_read(&set->nelems) > 0)) {
4517 NL_SET_BAD_ATTR(extack, attr);
4521 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4523 return nft_delset(&ctx, set);
4526 static int nft_validate_register_store(const struct nft_ctx *ctx,
4527 enum nft_registers reg,
4528 const struct nft_data *data,
4529 enum nft_data_types type,
4532 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4533 struct nft_set *set,
4534 struct nft_set_elem *elem)
4536 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4537 enum nft_registers dreg;
4539 dreg = nft_type_to_reg(set->dtype);
4540 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4541 set->dtype == NFT_DATA_VERDICT ?
4542 NFT_DATA_VERDICT : NFT_DATA_VALUE,
4546 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4547 struct nft_set *set,
4548 const struct nft_set_iter *iter,
4549 struct nft_set_elem *elem)
4551 return nft_setelem_data_validate(ctx, set, elem);
4554 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4555 struct nft_set *set)
4557 u8 genmask = nft_genmask_next(ctx->net);
4558 struct nft_set_elem_catchall *catchall;
4559 struct nft_set_elem elem;
4560 struct nft_set_ext *ext;
4563 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4564 ext = nft_set_elem_ext(set, catchall->elem);
4565 if (!nft_set_elem_active(ext, genmask))
4568 elem.priv = catchall->elem;
4569 ret = nft_setelem_data_validate(ctx, set, &elem);
4577 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4578 struct nft_set_binding *binding)
4580 struct nft_set_binding *i;
4581 struct nft_set_iter iter;
4583 if (set->use == UINT_MAX)
4586 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4589 if (binding->flags & NFT_SET_MAP) {
4590 /* If the set is already bound to the same chain all
4591 * jumps are already validated for that chain.
4593 list_for_each_entry(i, &set->bindings, list) {
4594 if (i->flags & NFT_SET_MAP &&
4595 i->chain == binding->chain)
4599 iter.genmask = nft_genmask_next(ctx->net);
4603 iter.fn = nf_tables_bind_check_setelem;
4605 set->ops->walk(ctx, set, &iter);
4607 iter.err = nft_set_catchall_bind_check(ctx, set);
4613 binding->chain = ctx->chain;
4614 list_add_tail_rcu(&binding->list, &set->bindings);
4615 nft_set_trans_bind(ctx, set);
4620 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4622 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4623 struct nft_set_binding *binding, bool event)
4625 list_del_rcu(&binding->list);
4627 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4628 list_del_rcu(&set->list);
4630 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4635 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4636 struct nft_set_binding *binding,
4637 enum nft_trans_phase phase)
4640 case NFT_TRANS_PREPARE:
4643 case NFT_TRANS_ABORT:
4644 case NFT_TRANS_RELEASE:
4648 nf_tables_unbind_set(ctx, set, binding,
4649 phase == NFT_TRANS_COMMIT);
4652 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4654 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4656 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4657 nft_set_destroy(ctx, set);
4659 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4661 const struct nft_set_ext_type nft_set_ext_types[] = {
4662 [NFT_SET_EXT_KEY] = {
4663 .align = __alignof__(u32),
4665 [NFT_SET_EXT_DATA] = {
4666 .align = __alignof__(u32),
4668 [NFT_SET_EXT_EXPRESSIONS] = {
4669 .align = __alignof__(struct nft_set_elem_expr),
4671 [NFT_SET_EXT_OBJREF] = {
4672 .len = sizeof(struct nft_object *),
4673 .align = __alignof__(struct nft_object *),
4675 [NFT_SET_EXT_FLAGS] = {
4677 .align = __alignof__(u8),
4679 [NFT_SET_EXT_TIMEOUT] = {
4681 .align = __alignof__(u64),
4683 [NFT_SET_EXT_EXPIRATION] = {
4685 .align = __alignof__(u64),
4687 [NFT_SET_EXT_USERDATA] = {
4688 .len = sizeof(struct nft_userdata),
4689 .align = __alignof__(struct nft_userdata),
4691 [NFT_SET_EXT_KEY_END] = {
4692 .align = __alignof__(u32),
4700 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4701 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
4702 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
4703 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
4704 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
4705 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
4706 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
4707 .len = NFT_USERDATA_MAXLEN },
4708 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
4709 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
4710 .len = NFT_OBJ_MAXNAMELEN - 1 },
4711 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
4712 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
4715 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4716 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
4717 .len = NFT_TABLE_MAXNAMELEN - 1 },
4718 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
4719 .len = NFT_SET_MAXNAMELEN - 1 },
4720 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
4721 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
4724 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4725 const struct nft_set *set,
4726 const struct nft_set_ext *ext)
4728 struct nft_set_elem_expr *elem_expr;
4729 u32 size, num_exprs = 0;
4730 struct nft_expr *expr;
4731 struct nlattr *nest;
4733 elem_expr = nft_set_ext_expr(ext);
4734 nft_setelem_expr_foreach(expr, elem_expr, size)
4737 if (num_exprs == 1) {
4738 expr = nft_setelem_expr_at(elem_expr, 0);
4739 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4743 } else if (num_exprs > 1) {
4744 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4746 goto nla_put_failure;
4748 nft_setelem_expr_foreach(expr, elem_expr, size) {
4749 expr = nft_setelem_expr_at(elem_expr, size);
4750 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4751 goto nla_put_failure;
4753 nla_nest_end(skb, nest);
4761 static int nf_tables_fill_setelem(struct sk_buff *skb,
4762 const struct nft_set *set,
4763 const struct nft_set_elem *elem)
4765 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4766 unsigned char *b = skb_tail_pointer(skb);
4767 struct nlattr *nest;
4769 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4771 goto nla_put_failure;
4773 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
4774 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4775 NFT_DATA_VALUE, set->klen) < 0)
4776 goto nla_put_failure;
4778 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4779 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4780 NFT_DATA_VALUE, set->klen) < 0)
4781 goto nla_put_failure;
4783 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4784 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4785 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4787 goto nla_put_failure;
4789 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4790 nft_set_elem_expr_dump(skb, set, ext))
4791 goto nla_put_failure;
4793 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4794 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4795 (*nft_set_ext_obj(ext))->key.name) < 0)
4796 goto nla_put_failure;
4798 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4799 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4800 htonl(*nft_set_ext_flags(ext))))
4801 goto nla_put_failure;
4803 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4804 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4805 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4807 goto nla_put_failure;
4809 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4810 u64 expires, now = get_jiffies_64();
4812 expires = *nft_set_ext_expiration(ext);
4813 if (time_before64(now, expires))
4818 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4819 nf_jiffies64_to_msecs(expires),
4821 goto nla_put_failure;
4824 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4825 struct nft_userdata *udata;
4827 udata = nft_set_ext_userdata(ext);
4828 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4829 udata->len + 1, udata->data))
4830 goto nla_put_failure;
4833 nla_nest_end(skb, nest);
4841 struct nft_set_dump_args {
4842 const struct netlink_callback *cb;
4843 struct nft_set_iter iter;
4844 struct sk_buff *skb;
4847 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4848 struct nft_set *set,
4849 const struct nft_set_iter *iter,
4850 struct nft_set_elem *elem)
4852 struct nft_set_dump_args *args;
4854 args = container_of(iter, struct nft_set_dump_args, iter);
4855 return nf_tables_fill_setelem(args->skb, set, elem);
4858 struct nft_set_dump_ctx {
4859 const struct nft_set *set;
4863 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
4864 const struct nft_set *set)
4866 struct nft_set_elem_catchall *catchall;
4867 u8 genmask = nft_genmask_cur(net);
4868 struct nft_set_elem elem;
4869 struct nft_set_ext *ext;
4872 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4873 ext = nft_set_elem_ext(set, catchall->elem);
4874 if (!nft_set_elem_active(ext, genmask) ||
4875 nft_set_elem_expired(ext))
4878 elem.priv = catchall->elem;
4879 ret = nf_tables_fill_setelem(skb, set, &elem);
4886 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4888 struct nft_set_dump_ctx *dump_ctx = cb->data;
4889 struct net *net = sock_net(skb->sk);
4890 struct nftables_pernet *nft_net;
4891 struct nft_table *table;
4892 struct nft_set *set;
4893 struct nft_set_dump_args args;
4894 bool set_found = false;
4895 struct nlmsghdr *nlh;
4896 struct nlattr *nest;
4901 nft_net = nft_pernet(net);
4902 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4903 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4904 dump_ctx->ctx.family != table->family)
4907 if (table != dump_ctx->ctx.table)
4910 list_for_each_entry_rcu(set, &table->sets, list) {
4911 if (set == dump_ctx->set) {
4924 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4925 portid = NETLINK_CB(cb->skb).portid;
4926 seq = cb->nlh->nlmsg_seq;
4928 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
4929 table->family, NFNETLINK_V0, nft_base_seq(net));
4931 goto nla_put_failure;
4933 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4934 goto nla_put_failure;
4935 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4936 goto nla_put_failure;
4938 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4940 goto nla_put_failure;
4944 args.iter.genmask = nft_genmask_cur(net);
4945 args.iter.skip = cb->args[0];
4946 args.iter.count = 0;
4948 args.iter.fn = nf_tables_dump_setelem;
4949 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4951 if (!args.iter.err && args.iter.count == cb->args[0])
4952 args.iter.err = nft_set_catchall_dump(net, skb, set);
4955 nla_nest_end(skb, nest);
4956 nlmsg_end(skb, nlh);
4958 if (args.iter.err && args.iter.err != -EMSGSIZE)
4959 return args.iter.err;
4960 if (args.iter.count == cb->args[0])
4963 cb->args[0] = args.iter.count;
4971 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4973 struct nft_set_dump_ctx *dump_ctx = cb->data;
4975 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4977 return cb->data ? 0 : -ENOMEM;
4980 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4986 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4987 const struct nft_ctx *ctx, u32 seq,
4988 u32 portid, int event, u16 flags,
4989 const struct nft_set *set,
4990 const struct nft_set_elem *elem)
4992 struct nlmsghdr *nlh;
4993 struct nlattr *nest;
4996 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4997 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4998 NFNETLINK_V0, nft_base_seq(ctx->net));
5000 goto nla_put_failure;
5002 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5003 goto nla_put_failure;
5004 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5005 goto nla_put_failure;
5007 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5009 goto nla_put_failure;
5011 err = nf_tables_fill_setelem(skb, set, elem);
5013 goto nla_put_failure;
5015 nla_nest_end(skb, nest);
5017 nlmsg_end(skb, nlh);
5021 nlmsg_trim(skb, nlh);
5025 static int nft_setelem_parse_flags(const struct nft_set *set,
5026 const struct nlattr *attr, u32 *flags)
5031 *flags = ntohl(nla_get_be32(attr));
5032 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5034 if (!(set->flags & NFT_SET_INTERVAL) &&
5035 *flags & NFT_SET_ELEM_INTERVAL_END)
5041 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5042 struct nft_data *key, struct nlattr *attr)
5044 struct nft_data_desc desc;
5047 err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
5051 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
5052 nft_data_release(key, desc.type);
5059 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5060 struct nft_data_desc *desc,
5061 struct nft_data *data,
5062 struct nlattr *attr)
5066 err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
5070 if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
5071 nft_data_release(data, desc->type);
5078 static void *nft_setelem_catchall_get(const struct net *net,
5079 const struct nft_set *set)
5081 struct nft_set_elem_catchall *catchall;
5082 u8 genmask = nft_genmask_cur(net);
5083 struct nft_set_ext *ext;
5086 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5087 ext = nft_set_elem_ext(set, catchall->elem);
5088 if (!nft_set_elem_active(ext, genmask) ||
5089 nft_set_elem_expired(ext))
5092 priv = catchall->elem;
5099 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5100 struct nft_set_elem *elem, u32 flags)
5104 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5105 priv = set->ops->get(ctx->net, set, elem, flags);
5107 return PTR_ERR(priv);
5109 priv = nft_setelem_catchall_get(ctx->net, set);
5118 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5119 const struct nlattr *attr)
5121 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5122 struct nft_set_elem elem;
5123 struct sk_buff *skb;
5127 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5128 nft_set_elem_policy, NULL);
5132 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5136 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5139 if (nla[NFTA_SET_ELEM_KEY]) {
5140 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5141 nla[NFTA_SET_ELEM_KEY]);
5146 if (nla[NFTA_SET_ELEM_KEY_END]) {
5147 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5148 nla[NFTA_SET_ELEM_KEY_END]);
5153 err = nft_setelem_get(ctx, set, &elem, flags);
5158 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5162 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5163 NFT_MSG_NEWSETELEM, 0, set, &elem);
5165 goto err_fill_setelem;
5167 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5174 /* called with rcu_read_lock held */
5175 static int nf_tables_getsetelem(struct sk_buff *skb,
5176 const struct nfnl_info *info,
5177 const struct nlattr * const nla[])
5179 struct netlink_ext_ack *extack = info->extack;
5180 u8 genmask = nft_genmask_cur(info->net);
5181 u8 family = info->nfmsg->nfgen_family;
5182 struct net *net = info->net;
5183 struct nft_table *table;
5184 struct nft_set *set;
5185 struct nlattr *attr;
5189 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5190 genmask, NETLINK_CB(skb).portid);
5191 if (IS_ERR(table)) {
5192 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5193 return PTR_ERR(table);
5196 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5198 return PTR_ERR(set);
5200 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5202 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5203 struct netlink_dump_control c = {
5204 .start = nf_tables_dump_set_start,
5205 .dump = nf_tables_dump_set,
5206 .done = nf_tables_dump_set_done,
5207 .module = THIS_MODULE,
5209 struct nft_set_dump_ctx dump_ctx = {
5215 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5218 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5221 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5222 err = nft_get_set_elem(&ctx, set, attr);
5230 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5231 const struct nft_set *set,
5232 const struct nft_set_elem *elem,
5233 int event, u16 flags)
5235 struct nftables_pernet *nft_net;
5236 struct net *net = ctx->net;
5237 u32 portid = ctx->portid;
5238 struct sk_buff *skb;
5241 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5244 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5248 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5255 nft_net = nft_pernet(net);
5256 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5259 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5262 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5264 struct nft_set *set)
5266 struct nft_trans *trans;
5268 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5272 nft_trans_elem_set(trans) = set;
5276 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5277 const struct nft_set *set,
5278 const struct nlattr *attr)
5280 struct nft_expr *expr;
5283 expr = nft_expr_init(ctx, attr);
5288 if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL))
5289 goto err_set_elem_expr;
5291 if (expr->ops->type->flags & NFT_EXPR_GC) {
5292 if (set->flags & NFT_SET_TIMEOUT)
5293 goto err_set_elem_expr;
5294 if (!set->ops->gc_init)
5295 goto err_set_elem_expr;
5296 set->ops->gc_init(set);
5302 nft_expr_destroy(ctx, expr);
5303 return ERR_PTR(err);
5306 void *nft_set_elem_init(const struct nft_set *set,
5307 const struct nft_set_ext_tmpl *tmpl,
5308 const u32 *key, const u32 *key_end,
5309 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5311 struct nft_set_ext *ext;
5314 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5318 ext = nft_set_elem_ext(set, elem);
5319 nft_set_ext_init(ext, tmpl);
5321 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY))
5322 memcpy(nft_set_ext_key(ext), key, set->klen);
5323 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5324 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5325 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5326 memcpy(nft_set_ext_data(ext), data, set->dlen);
5327 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5328 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5329 if (expiration == 0)
5330 *nft_set_ext_expiration(ext) += timeout;
5332 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5333 *nft_set_ext_timeout(ext) = timeout;
5338 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5339 struct nft_expr *expr)
5341 if (expr->ops->destroy_clone) {
5342 expr->ops->destroy_clone(ctx, expr);
5343 module_put(expr->ops->type->owner);
5345 nf_tables_expr_destroy(ctx, expr);
5349 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5350 struct nft_set_elem_expr *elem_expr)
5352 struct nft_expr *expr;
5355 nft_setelem_expr_foreach(expr, elem_expr, size)
5356 __nft_set_elem_expr_destroy(ctx, expr);
5359 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5362 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5363 struct nft_ctx ctx = {
5364 .net = read_pnet(&set->net),
5365 .family = set->table->family,
5368 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5369 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5370 nft_data_release(nft_set_ext_data(ext), set->dtype);
5371 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5372 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5374 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5375 (*nft_set_ext_obj(ext))->use--;
5378 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5380 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5381 * with the refcounting from the preparation phase.
5383 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5384 const struct nft_set *set, void *elem)
5386 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5388 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5389 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5394 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5395 struct nft_expr *expr_array[])
5397 struct nft_expr *expr;
5400 for (i = 0; i < set->num_exprs; i++) {
5401 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL);
5405 err = nft_expr_clone(expr, set->exprs[i]);
5407 nft_expr_destroy(ctx, expr);
5410 expr_array[i] = expr;
5416 for (k = i - 1; k >= 0; k--)
5417 nft_expr_destroy(ctx, expr_array[k]);
5422 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5423 const struct nft_set_ext *ext,
5424 struct nft_expr *expr_array[],
5427 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5428 struct nft_expr *expr;
5431 for (i = 0; i < num_exprs; i++) {
5432 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5433 err = nft_expr_clone(expr, expr_array[i]);
5435 goto err_elem_expr_setup;
5437 elem_expr->size += expr_array[i]->ops->size;
5438 nft_expr_destroy(ctx, expr_array[i]);
5439 expr_array[i] = NULL;
5444 err_elem_expr_setup:
5445 for (; i < num_exprs; i++) {
5446 nft_expr_destroy(ctx, expr_array[i]);
5447 expr_array[i] = NULL;
5453 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5454 const struct nft_set *set)
5456 struct nft_set_elem_catchall *catchall;
5457 u8 genmask = nft_genmask_cur(net);
5458 struct nft_set_ext *ext;
5460 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5461 ext = nft_set_elem_ext(set, catchall->elem);
5462 if (nft_set_elem_active(ext, genmask) &&
5463 !nft_set_elem_expired(ext))
5469 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5471 void *nft_set_catchall_gc(const struct nft_set *set)
5473 struct nft_set_elem_catchall *catchall, *next;
5474 struct nft_set_ext *ext;
5477 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5478 ext = nft_set_elem_ext(set, catchall->elem);
5480 if (!nft_set_elem_expired(ext) ||
5481 nft_set_elem_mark_busy(ext))
5484 elem = catchall->elem;
5485 list_del_rcu(&catchall->list);
5486 kfree_rcu(catchall, rcu);
5492 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5494 static int nft_setelem_catchall_insert(const struct net *net,
5495 struct nft_set *set,
5496 const struct nft_set_elem *elem,
5497 struct nft_set_ext **pext)
5499 struct nft_set_elem_catchall *catchall;
5500 u8 genmask = nft_genmask_next(net);
5501 struct nft_set_ext *ext;
5503 list_for_each_entry(catchall, &set->catchall_list, list) {
5504 ext = nft_set_elem_ext(set, catchall->elem);
5505 if (nft_set_elem_active(ext, genmask)) {
5511 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5515 catchall->elem = elem->priv;
5516 list_add_tail_rcu(&catchall->list, &set->catchall_list);
5521 static int nft_setelem_insert(const struct net *net,
5522 struct nft_set *set,
5523 const struct nft_set_elem *elem,
5524 struct nft_set_ext **ext, unsigned int flags)
5528 if (flags & NFT_SET_ELEM_CATCHALL)
5529 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5531 ret = set->ops->insert(net, set, elem, ext);
5536 static bool nft_setelem_is_catchall(const struct nft_set *set,
5537 const struct nft_set_elem *elem)
5539 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5541 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5542 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5548 static void nft_setelem_activate(struct net *net, struct nft_set *set,
5549 struct nft_set_elem *elem)
5551 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5553 if (nft_setelem_is_catchall(set, elem)) {
5554 nft_set_elem_change_active(net, set, ext);
5555 nft_set_elem_clear_busy(ext);
5557 set->ops->activate(net, set, elem);
5561 static int nft_setelem_catchall_deactivate(const struct net *net,
5562 struct nft_set *set,
5563 struct nft_set_elem *elem)
5565 struct nft_set_elem_catchall *catchall;
5566 struct nft_set_ext *ext;
5568 list_for_each_entry(catchall, &set->catchall_list, list) {
5569 ext = nft_set_elem_ext(set, catchall->elem);
5570 if (!nft_is_active(net, ext) ||
5571 nft_set_elem_mark_busy(ext))
5575 elem->priv = catchall->elem;
5576 nft_set_elem_change_active(net, set, ext);
5583 static int __nft_setelem_deactivate(const struct net *net,
5584 struct nft_set *set,
5585 struct nft_set_elem *elem)
5589 priv = set->ops->deactivate(net, set, elem);
5600 static int nft_setelem_deactivate(const struct net *net,
5601 struct nft_set *set,
5602 struct nft_set_elem *elem, u32 flags)
5606 if (flags & NFT_SET_ELEM_CATCHALL)
5607 ret = nft_setelem_catchall_deactivate(net, set, elem);
5609 ret = __nft_setelem_deactivate(net, set, elem);
5614 static void nft_setelem_catchall_remove(const struct net *net,
5615 const struct nft_set *set,
5616 const struct nft_set_elem *elem)
5618 struct nft_set_elem_catchall *catchall, *next;
5620 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5621 if (catchall->elem == elem->priv) {
5622 list_del_rcu(&catchall->list);
5623 kfree_rcu(catchall);
5629 static void nft_setelem_remove(const struct net *net,
5630 const struct nft_set *set,
5631 const struct nft_set_elem *elem)
5633 if (nft_setelem_is_catchall(set, elem))
5634 nft_setelem_catchall_remove(net, set, elem);
5636 set->ops->remove(net, set, elem);
5639 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5640 const struct nlattr *attr, u32 nlmsg_flags)
5642 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5643 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5644 u8 genmask = nft_genmask_next(ctx->net);
5645 u32 flags = 0, size = 0, num_exprs = 0;
5646 struct nft_set_ext_tmpl tmpl;
5647 struct nft_set_ext *ext, *ext2;
5648 struct nft_set_elem elem;
5649 struct nft_set_binding *binding;
5650 struct nft_object *obj = NULL;
5651 struct nft_userdata *udata;
5652 struct nft_data_desc desc;
5653 enum nft_registers dreg;
5654 struct nft_trans *trans;
5660 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5661 nft_set_elem_policy, NULL);
5665 nft_set_ext_prepare(&tmpl);
5667 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5671 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5675 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5677 if (set->flags & NFT_SET_MAP) {
5678 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5679 !(flags & NFT_SET_ELEM_INTERVAL_END))
5682 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5686 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5687 (nla[NFTA_SET_ELEM_DATA] ||
5688 nla[NFTA_SET_ELEM_OBJREF] ||
5689 nla[NFTA_SET_ELEM_TIMEOUT] ||
5690 nla[NFTA_SET_ELEM_EXPIRATION] ||
5691 nla[NFTA_SET_ELEM_USERDATA] ||
5692 nla[NFTA_SET_ELEM_EXPR] ||
5693 nla[NFTA_SET_ELEM_EXPRESSIONS]))
5697 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5698 if (!(set->flags & NFT_SET_TIMEOUT))
5700 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5704 } else if (set->flags & NFT_SET_TIMEOUT) {
5705 timeout = set->timeout;
5709 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5710 if (!(set->flags & NFT_SET_TIMEOUT))
5712 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5718 if (nla[NFTA_SET_ELEM_EXPR]) {
5719 struct nft_expr *expr;
5721 if (set->num_exprs && set->num_exprs != 1)
5724 expr = nft_set_elem_expr_alloc(ctx, set,
5725 nla[NFTA_SET_ELEM_EXPR]);
5727 return PTR_ERR(expr);
5729 expr_array[0] = expr;
5732 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
5734 goto err_set_elem_expr;
5736 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5737 struct nft_expr *expr;
5742 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
5743 if (i == NFT_SET_EXPR_MAX ||
5744 (set->num_exprs && set->num_exprs == i)) {
5746 goto err_set_elem_expr;
5748 if (nla_type(tmp) != NFTA_LIST_ELEM) {
5750 goto err_set_elem_expr;
5752 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5754 err = PTR_ERR(expr);
5755 goto err_set_elem_expr;
5757 expr_array[i] = expr;
5760 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
5762 goto err_set_elem_expr;
5766 if (set->num_exprs && set->num_exprs != i) {
5768 goto err_set_elem_expr;
5770 } else if (set->num_exprs > 0) {
5771 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5773 goto err_set_elem_expr_clone;
5775 num_exprs = set->num_exprs;
5778 if (nla[NFTA_SET_ELEM_KEY]) {
5779 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5780 nla[NFTA_SET_ELEM_KEY]);
5782 goto err_set_elem_expr;
5784 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5787 if (nla[NFTA_SET_ELEM_KEY_END]) {
5788 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5789 nla[NFTA_SET_ELEM_KEY_END]);
5793 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5797 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5798 if (timeout != set->timeout)
5799 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5803 for (i = 0; i < num_exprs; i++)
5804 size += expr_array[i]->ops->size;
5806 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
5807 sizeof(struct nft_set_elem_expr) +
5811 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5812 if (!(set->flags & NFT_SET_OBJECT)) {
5814 goto err_parse_key_end;
5816 obj = nft_obj_lookup(ctx->net, ctx->table,
5817 nla[NFTA_SET_ELEM_OBJREF],
5818 set->objtype, genmask);
5821 goto err_parse_key_end;
5823 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5826 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5827 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5828 nla[NFTA_SET_ELEM_DATA]);
5830 goto err_parse_key_end;
5832 dreg = nft_type_to_reg(set->dtype);
5833 list_for_each_entry(binding, &set->bindings, list) {
5834 struct nft_ctx bind_ctx = {
5836 .family = ctx->family,
5837 .table = ctx->table,
5838 .chain = (struct nft_chain *)binding->chain,
5841 if (!(binding->flags & NFT_SET_MAP))
5844 err = nft_validate_register_store(&bind_ctx, dreg,
5846 desc.type, desc.len);
5848 goto err_parse_data;
5850 if (desc.type == NFT_DATA_VERDICT &&
5851 (elem.data.val.verdict.code == NFT_GOTO ||
5852 elem.data.val.verdict.code == NFT_JUMP))
5853 nft_validate_state_update(ctx->net,
5857 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
5860 /* The full maximum length of userdata can exceed the maximum
5861 * offset value (U8_MAX) for following extensions, therefor it
5862 * must be the last extension added.
5865 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5866 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5868 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5873 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5874 elem.key_end.val.data, elem.data.val.data,
5875 timeout, expiration, GFP_KERNEL);
5876 if (elem.priv == NULL)
5877 goto err_parse_data;
5879 ext = nft_set_elem_ext(set, elem.priv);
5881 *nft_set_ext_flags(ext) = flags;
5883 udata = nft_set_ext_userdata(ext);
5884 udata->len = ulen - 1;
5885 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5888 *nft_set_ext_obj(ext) = obj;
5891 err = nft_set_elem_expr_setup(ctx, ext, expr_array, num_exprs);
5895 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5896 if (trans == NULL) {
5901 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
5903 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
5905 if (err == -EEXIST) {
5906 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5907 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5908 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
5909 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
5910 goto err_element_clash;
5911 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5912 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5913 memcmp(nft_set_ext_data(ext),
5914 nft_set_ext_data(ext2), set->dlen) != 0) ||
5915 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5916 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5917 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
5918 goto err_element_clash;
5919 else if (!(nlmsg_flags & NLM_F_EXCL))
5921 } else if (err == -ENOTEMPTY) {
5922 /* ENOTEMPTY reports overlapping between this element
5923 * and an existing one.
5927 goto err_element_clash;
5930 if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
5931 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5936 nft_trans_elem(trans) = elem;
5937 nft_trans_commit_list_add_tail(ctx->net, trans);
5941 nft_setelem_remove(ctx->net, set, &elem);
5948 nf_tables_set_elem_destroy(ctx, set, elem.priv);
5950 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5951 nft_data_release(&elem.data.val, desc.type);
5953 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
5955 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5957 for (i = 0; i < num_exprs && expr_array[i]; i++)
5958 nft_expr_destroy(ctx, expr_array[i]);
5959 err_set_elem_expr_clone:
5963 static int nf_tables_newsetelem(struct sk_buff *skb,
5964 const struct nfnl_info *info,
5965 const struct nlattr * const nla[])
5967 struct nftables_pernet *nft_net = nft_pernet(info->net);
5968 struct netlink_ext_ack *extack = info->extack;
5969 u8 genmask = nft_genmask_next(info->net);
5970 u8 family = info->nfmsg->nfgen_family;
5971 struct net *net = info->net;
5972 const struct nlattr *attr;
5973 struct nft_table *table;
5974 struct nft_set *set;
5978 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
5981 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5982 genmask, NETLINK_CB(skb).portid);
5983 if (IS_ERR(table)) {
5984 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5985 return PTR_ERR(table);
5988 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
5989 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
5991 return PTR_ERR(set);
5993 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5996 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5998 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5999 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6004 if (nft_net->validate_state == NFT_VALIDATE_DO)
6005 return nft_table_validate(net, table);
6011 * nft_data_hold - hold a nft_data item
6013 * @data: struct nft_data to release
6014 * @type: type of data
6016 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6017 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6018 * NFT_GOTO verdicts. This function must be called on active data objects
6019 * from the second phase of the commit protocol.
6021 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6023 struct nft_chain *chain;
6024 struct nft_rule *rule;
6026 if (type == NFT_DATA_VERDICT) {
6027 switch (data->verdict.code) {
6030 chain = data->verdict.chain;
6033 if (!nft_chain_is_bound(chain))
6036 chain->table->use++;
6037 list_for_each_entry(rule, &chain->rules, list)
6040 nft_chain_add(chain->table, chain);
6046 static void nft_setelem_data_activate(const struct net *net,
6047 const struct nft_set *set,
6048 struct nft_set_elem *elem)
6050 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6052 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6053 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6054 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6055 (*nft_set_ext_obj(ext))->use++;
6058 static void nft_setelem_data_deactivate(const struct net *net,
6059 const struct nft_set *set,
6060 struct nft_set_elem *elem)
6062 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6064 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6065 nft_data_release(nft_set_ext_data(ext), set->dtype);
6066 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6067 (*nft_set_ext_obj(ext))->use--;
6070 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6071 const struct nlattr *attr)
6073 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6074 struct nft_set_ext_tmpl tmpl;
6075 struct nft_set_elem elem;
6076 struct nft_set_ext *ext;
6077 struct nft_trans *trans;
6081 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6082 nft_set_elem_policy, NULL);
6086 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6090 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6093 nft_set_ext_prepare(&tmpl);
6096 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6098 if (nla[NFTA_SET_ELEM_KEY]) {
6099 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6100 nla[NFTA_SET_ELEM_KEY]);
6104 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6107 if (nla[NFTA_SET_ELEM_KEY_END]) {
6108 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6109 nla[NFTA_SET_ELEM_KEY_END]);
6113 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6117 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6118 elem.key_end.val.data, NULL, 0, 0,
6120 if (elem.priv == NULL)
6123 ext = nft_set_elem_ext(set, elem.priv);
6125 *nft_set_ext_flags(ext) = flags;
6127 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6131 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6135 nft_setelem_data_deactivate(ctx->net, set, &elem);
6137 nft_trans_elem(trans) = elem;
6138 nft_trans_commit_list_add_tail(ctx->net, trans);
6146 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6150 static int nft_setelem_flush(const struct nft_ctx *ctx,
6151 struct nft_set *set,
6152 const struct nft_set_iter *iter,
6153 struct nft_set_elem *elem)
6155 struct nft_trans *trans;
6158 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6159 sizeof(struct nft_trans_elem), GFP_ATOMIC);
6163 if (!set->ops->flush(ctx->net, set, elem->priv)) {
6169 nft_setelem_data_deactivate(ctx->net, set, elem);
6170 nft_trans_elem_set(trans) = set;
6171 nft_trans_elem(trans) = *elem;
6172 nft_trans_commit_list_add_tail(ctx->net, trans);
6180 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6181 struct nft_set *set,
6182 struct nft_set_elem *elem)
6184 struct nft_trans *trans;
6186 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6187 sizeof(struct nft_trans_elem), GFP_KERNEL);
6191 nft_setelem_data_deactivate(ctx->net, set, elem);
6192 nft_trans_elem_set(trans) = set;
6193 nft_trans_elem(trans) = *elem;
6194 nft_trans_commit_list_add_tail(ctx->net, trans);
6199 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6200 struct nft_set *set)
6202 u8 genmask = nft_genmask_next(ctx->net);
6203 struct nft_set_elem_catchall *catchall;
6204 struct nft_set_elem elem;
6205 struct nft_set_ext *ext;
6208 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6209 ext = nft_set_elem_ext(set, catchall->elem);
6210 if (!nft_set_elem_active(ext, genmask) ||
6211 nft_set_elem_mark_busy(ext))
6214 elem.priv = catchall->elem;
6215 ret = __nft_set_catchall_flush(ctx, set, &elem);
6223 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6225 struct nft_set_iter iter = {
6227 .fn = nft_setelem_flush,
6230 set->ops->walk(ctx, set, &iter);
6232 iter.err = nft_set_catchall_flush(ctx, set);
6237 static int nf_tables_delsetelem(struct sk_buff *skb,
6238 const struct nfnl_info *info,
6239 const struct nlattr * const nla[])
6241 struct netlink_ext_ack *extack = info->extack;
6242 u8 genmask = nft_genmask_next(info->net);
6243 u8 family = info->nfmsg->nfgen_family;
6244 struct net *net = info->net;
6245 const struct nlattr *attr;
6246 struct nft_table *table;
6247 struct nft_set *set;
6251 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6252 genmask, NETLINK_CB(skb).portid);
6253 if (IS_ERR(table)) {
6254 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6255 return PTR_ERR(table);
6258 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6260 return PTR_ERR(set);
6261 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6264 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6266 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6267 return nft_set_flush(&ctx, set, genmask);
6269 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6270 err = nft_del_setelem(&ctx, set, attr);
6277 void nft_set_gc_batch_release(struct rcu_head *rcu)
6279 struct nft_set_gc_batch *gcb;
6282 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6283 for (i = 0; i < gcb->head.cnt; i++)
6284 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6288 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6291 struct nft_set_gc_batch *gcb;
6293 gcb = kzalloc(sizeof(*gcb), gfp);
6296 gcb->head.set = set;
6305 * nft_register_obj- register nf_tables stateful object type
6306 * @obj_type: object type
6308 * Registers the object type for use with nf_tables. Returns zero on
6309 * success or a negative errno code otherwise.
6311 int nft_register_obj(struct nft_object_type *obj_type)
6313 if (obj_type->type == NFT_OBJECT_UNSPEC)
6316 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6317 list_add_rcu(&obj_type->list, &nf_tables_objects);
6318 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6321 EXPORT_SYMBOL_GPL(nft_register_obj);
6324 * nft_unregister_obj - unregister nf_tables object type
6325 * @obj_type: object type
6327 * Unregisters the object type for use with nf_tables.
6329 void nft_unregister_obj(struct nft_object_type *obj_type)
6331 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6332 list_del_rcu(&obj_type->list);
6333 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6335 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6337 struct nft_object *nft_obj_lookup(const struct net *net,
6338 const struct nft_table *table,
6339 const struct nlattr *nla, u32 objtype,
6342 struct nft_object_hash_key k = { .table = table };
6343 char search[NFT_OBJ_MAXNAMELEN];
6344 struct rhlist_head *tmp, *list;
6345 struct nft_object *obj;
6347 nla_strscpy(search, nla, sizeof(search));
6350 WARN_ON_ONCE(!rcu_read_lock_held() &&
6351 !lockdep_commit_lock_is_held(net));
6354 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6358 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6359 if (objtype == obj->ops->type->type &&
6360 nft_active_genmask(obj, genmask)) {
6367 return ERR_PTR(-ENOENT);
6369 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6371 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6372 const struct nlattr *nla,
6373 u32 objtype, u8 genmask)
6375 struct nft_object *obj;
6377 list_for_each_entry(obj, &table->objects, list) {
6378 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6379 objtype == obj->ops->type->type &&
6380 nft_active_genmask(obj, genmask))
6383 return ERR_PTR(-ENOENT);
6386 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6387 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
6388 .len = NFT_TABLE_MAXNAMELEN - 1 },
6389 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
6390 .len = NFT_OBJ_MAXNAMELEN - 1 },
6391 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
6392 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
6393 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
6394 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
6395 .len = NFT_USERDATA_MAXLEN },
6398 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6399 const struct nft_object_type *type,
6400 const struct nlattr *attr)
6403 const struct nft_object_ops *ops;
6404 struct nft_object *obj;
6407 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6412 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6413 type->policy, NULL);
6417 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6420 if (type->select_ops) {
6421 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6431 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
6435 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6448 return ERR_PTR(err);
6451 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6452 struct nft_object *obj, bool reset)
6454 struct nlattr *nest;
6456 nest = nla_nest_start_noflag(skb, attr);
6458 goto nla_put_failure;
6459 if (obj->ops->dump(skb, obj, reset) < 0)
6460 goto nla_put_failure;
6461 nla_nest_end(skb, nest);
6468 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6470 const struct nft_object_type *type;
6472 list_for_each_entry(type, &nf_tables_objects, list) {
6473 if (objtype == type->type)
6479 static const struct nft_object_type *
6480 nft_obj_type_get(struct net *net, u32 objtype)
6482 const struct nft_object_type *type;
6484 type = __nft_obj_type_get(objtype);
6485 if (type != NULL && try_module_get(type->owner))
6488 lockdep_nfnl_nft_mutex_not_held();
6489 #ifdef CONFIG_MODULES
6491 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6492 return ERR_PTR(-EAGAIN);
6495 return ERR_PTR(-ENOENT);
6498 static int nf_tables_updobj(const struct nft_ctx *ctx,
6499 const struct nft_object_type *type,
6500 const struct nlattr *attr,
6501 struct nft_object *obj)
6503 struct nft_object *newobj;
6504 struct nft_trans *trans;
6507 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6508 sizeof(struct nft_trans_obj));
6512 newobj = nft_obj_init(ctx, type, attr);
6513 if (IS_ERR(newobj)) {
6514 err = PTR_ERR(newobj);
6515 goto err_free_trans;
6518 nft_trans_obj(trans) = obj;
6519 nft_trans_obj_update(trans) = true;
6520 nft_trans_obj_newobj(trans) = newobj;
6521 nft_trans_commit_list_add_tail(ctx->net, trans);
6530 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
6531 const struct nlattr * const nla[])
6533 struct netlink_ext_ack *extack = info->extack;
6534 u8 genmask = nft_genmask_next(info->net);
6535 u8 family = info->nfmsg->nfgen_family;
6536 const struct nft_object_type *type;
6537 struct net *net = info->net;
6538 struct nft_table *table;
6539 struct nft_object *obj;
6544 if (!nla[NFTA_OBJ_TYPE] ||
6545 !nla[NFTA_OBJ_NAME] ||
6546 !nla[NFTA_OBJ_DATA])
6549 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6550 NETLINK_CB(skb).portid);
6551 if (IS_ERR(table)) {
6552 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6553 return PTR_ERR(table);
6556 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6557 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6560 if (err != -ENOENT) {
6561 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6565 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
6566 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6569 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
6572 type = __nft_obj_type_get(objtype);
6573 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6575 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6578 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6580 type = nft_obj_type_get(net, objtype);
6582 return PTR_ERR(type);
6584 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6589 obj->key.table = table;
6590 obj->handle = nf_tables_alloc_handle(table);
6592 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
6593 if (!obj->key.name) {
6598 if (nla[NFTA_OBJ_USERDATA]) {
6599 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6600 if (obj->udata == NULL)
6603 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6606 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6610 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6611 nft_objname_ht_params);
6615 list_add_tail_rcu(&obj->list, &table->objects);
6619 /* queued in transaction log */
6620 INIT_LIST_HEAD(&obj->list);
6625 kfree(obj->key.name);
6627 if (obj->ops->destroy)
6628 obj->ops->destroy(&ctx, obj);
6631 module_put(type->owner);
6635 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6636 u32 portid, u32 seq, int event, u32 flags,
6637 int family, const struct nft_table *table,
6638 struct nft_object *obj, bool reset)
6640 struct nlmsghdr *nlh;
6642 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6643 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
6644 NFNETLINK_V0, nft_base_seq(net));
6646 goto nla_put_failure;
6648 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6649 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6650 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6651 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6652 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6653 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6655 goto nla_put_failure;
6658 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6659 goto nla_put_failure;
6661 nlmsg_end(skb, nlh);
6665 nlmsg_trim(skb, nlh);
6669 struct nft_obj_filter {
6674 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6676 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6677 const struct nft_table *table;
6678 unsigned int idx = 0, s_idx = cb->args[0];
6679 struct nft_obj_filter *filter = cb->data;
6680 struct net *net = sock_net(skb->sk);
6681 int family = nfmsg->nfgen_family;
6682 struct nftables_pernet *nft_net;
6683 struct nft_object *obj;
6686 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6690 nft_net = nft_pernet(net);
6691 cb->seq = nft_net->base_seq;
6693 list_for_each_entry_rcu(table, &nft_net->tables, list) {
6694 if (family != NFPROTO_UNSPEC && family != table->family)
6697 list_for_each_entry_rcu(obj, &table->objects, list) {
6698 if (!nft_is_active(net, obj))
6703 memset(&cb->args[1], 0,
6704 sizeof(cb->args) - sizeof(cb->args[0]));
6705 if (filter && filter->table &&
6706 strcmp(filter->table, table->name))
6709 filter->type != NFT_OBJECT_UNSPEC &&
6710 obj->ops->type->type != filter->type)
6713 char *buf = kasprintf(GFP_ATOMIC,
6718 audit_log_nfcfg(buf,
6721 AUDIT_NFT_OP_OBJ_RESET,
6726 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6729 NLM_F_MULTI | NLM_F_APPEND,
6730 table->family, table,
6734 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6746 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6748 const struct nlattr * const *nla = cb->data;
6749 struct nft_obj_filter *filter = NULL;
6751 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6752 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6756 if (nla[NFTA_OBJ_TABLE]) {
6757 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6758 if (!filter->table) {
6764 if (nla[NFTA_OBJ_TYPE])
6765 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6772 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6774 struct nft_obj_filter *filter = cb->data;
6777 kfree(filter->table);
6784 /* called with rcu_read_lock held */
6785 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
6786 const struct nlattr * const nla[])
6788 struct netlink_ext_ack *extack = info->extack;
6789 u8 genmask = nft_genmask_cur(info->net);
6790 u8 family = info->nfmsg->nfgen_family;
6791 const struct nft_table *table;
6792 struct net *net = info->net;
6793 struct nft_object *obj;
6794 struct sk_buff *skb2;
6799 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6800 struct netlink_dump_control c = {
6801 .start = nf_tables_dump_obj_start,
6802 .dump = nf_tables_dump_obj,
6803 .done = nf_tables_dump_obj_done,
6804 .module = THIS_MODULE,
6805 .data = (void *)nla,
6808 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6811 if (!nla[NFTA_OBJ_NAME] ||
6812 !nla[NFTA_OBJ_TYPE])
6815 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
6816 if (IS_ERR(table)) {
6817 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6818 return PTR_ERR(table);
6821 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6822 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6824 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6825 return PTR_ERR(obj);
6828 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6832 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6836 const struct nftables_pernet *nft_net;
6839 nft_net = nft_pernet(net);
6840 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
6842 audit_log_nfcfg(buf,
6845 AUDIT_NFT_OP_OBJ_RESET,
6850 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6851 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
6852 family, table, obj, reset);
6854 goto err_fill_obj_info;
6856 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6863 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
6865 if (obj->ops->destroy)
6866 obj->ops->destroy(ctx, obj);
6868 module_put(obj->ops->type->owner);
6869 kfree(obj->key.name);
6874 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
6875 const struct nlattr * const nla[])
6877 struct netlink_ext_ack *extack = info->extack;
6878 u8 genmask = nft_genmask_next(info->net);
6879 u8 family = info->nfmsg->nfgen_family;
6880 struct net *net = info->net;
6881 const struct nlattr *attr;
6882 struct nft_table *table;
6883 struct nft_object *obj;
6887 if (!nla[NFTA_OBJ_TYPE] ||
6888 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
6891 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6892 NETLINK_CB(skb).portid);
6893 if (IS_ERR(table)) {
6894 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6895 return PTR_ERR(table);
6898 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6899 if (nla[NFTA_OBJ_HANDLE]) {
6900 attr = nla[NFTA_OBJ_HANDLE];
6901 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
6903 attr = nla[NFTA_OBJ_NAME];
6904 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
6908 NL_SET_BAD_ATTR(extack, attr);
6909 return PTR_ERR(obj);
6912 NL_SET_BAD_ATTR(extack, attr);
6916 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6918 return nft_delobj(&ctx, obj);
6921 void nft_obj_notify(struct net *net, const struct nft_table *table,
6922 struct nft_object *obj, u32 portid, u32 seq, int event,
6923 int family, int report, gfp_t gfp)
6925 struct nftables_pernet *nft_net = nft_pernet(net);
6926 struct sk_buff *skb;
6928 char *buf = kasprintf(gfp, "%s:%u",
6929 table->name, nft_net->base_seq);
6931 audit_log_nfcfg(buf,
6934 event == NFT_MSG_NEWOBJ ?
6935 AUDIT_NFT_OP_OBJ_REGISTER :
6936 AUDIT_NFT_OP_OBJ_UNREGISTER,
6941 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6944 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
6948 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
6955 nft_notify_enqueue(skb, report, &nft_net->notify_list);
6958 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6960 EXPORT_SYMBOL_GPL(nft_obj_notify);
6962 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
6963 struct nft_object *obj, int event)
6965 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
6966 ctx->family, ctx->report, GFP_KERNEL);
6972 void nft_register_flowtable_type(struct nf_flowtable_type *type)
6974 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6975 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
6976 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6978 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
6980 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
6982 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6983 list_del_rcu(&type->list);
6984 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6986 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
6988 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
6989 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
6990 .len = NFT_NAME_MAXLEN - 1 },
6991 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
6992 .len = NFT_NAME_MAXLEN - 1 },
6993 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
6994 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
6995 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
6998 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
6999 const struct nlattr *nla, u8 genmask)
7001 struct nft_flowtable *flowtable;
7003 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7004 if (!nla_strcmp(nla, flowtable->name) &&
7005 nft_active_genmask(flowtable, genmask))
7008 return ERR_PTR(-ENOENT);
7010 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7012 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7013 struct nft_flowtable *flowtable,
7014 enum nft_trans_phase phase)
7017 case NFT_TRANS_PREPARE:
7018 case NFT_TRANS_ABORT:
7019 case NFT_TRANS_RELEASE:
7026 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7028 static struct nft_flowtable *
7029 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7030 const struct nlattr *nla, u8 genmask)
7032 struct nft_flowtable *flowtable;
7034 list_for_each_entry(flowtable, &table->flowtables, list) {
7035 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7036 nft_active_genmask(flowtable, genmask))
7039 return ERR_PTR(-ENOENT);
7042 struct nft_flowtable_hook {
7045 struct list_head list;
7048 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7049 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
7050 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
7051 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
7054 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7055 const struct nlattr *attr,
7056 struct nft_flowtable_hook *flowtable_hook,
7057 struct nft_flowtable *flowtable, bool add)
7059 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7060 struct nft_hook *hook;
7061 int hooknum, priority;
7064 INIT_LIST_HEAD(&flowtable_hook->list);
7066 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7067 nft_flowtable_hook_policy, NULL);
7072 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7073 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7076 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7077 if (hooknum != NF_NETDEV_INGRESS)
7080 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7082 flowtable_hook->priority = priority;
7083 flowtable_hook->num = hooknum;
7085 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7086 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7087 if (hooknum != flowtable->hooknum)
7091 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7092 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7093 if (priority != flowtable->data.priority)
7097 flowtable_hook->priority = flowtable->data.priority;
7098 flowtable_hook->num = flowtable->hooknum;
7101 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7102 err = nf_tables_parse_netdev_hooks(ctx->net,
7103 tb[NFTA_FLOWTABLE_HOOK_DEVS],
7104 &flowtable_hook->list);
7109 list_for_each_entry(hook, &flowtable_hook->list, list) {
7110 hook->ops.pf = NFPROTO_NETDEV;
7111 hook->ops.hooknum = flowtable_hook->num;
7112 hook->ops.priority = flowtable_hook->priority;
7113 hook->ops.priv = &flowtable->data;
7114 hook->ops.hook = flowtable->data.type->hook;
7120 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7122 const struct nf_flowtable_type *type;
7124 list_for_each_entry(type, &nf_tables_flowtables, list) {
7125 if (family == type->family)
7131 static const struct nf_flowtable_type *
7132 nft_flowtable_type_get(struct net *net, u8 family)
7134 const struct nf_flowtable_type *type;
7136 type = __nft_flowtable_type_get(family);
7137 if (type != NULL && try_module_get(type->owner))
7140 lockdep_nfnl_nft_mutex_not_held();
7141 #ifdef CONFIG_MODULES
7143 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7144 return ERR_PTR(-EAGAIN);
7147 return ERR_PTR(-ENOENT);
7150 /* Only called from error and netdev event paths. */
7151 static void nft_unregister_flowtable_hook(struct net *net,
7152 struct nft_flowtable *flowtable,
7153 struct nft_hook *hook)
7155 nf_unregister_net_hook(net, &hook->ops);
7156 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7160 static void nft_unregister_flowtable_net_hooks(struct net *net,
7161 struct list_head *hook_list)
7163 struct nft_hook *hook;
7165 list_for_each_entry(hook, hook_list, list)
7166 nf_unregister_net_hook(net, &hook->ops);
7169 static int nft_register_flowtable_net_hooks(struct net *net,
7170 struct nft_table *table,
7171 struct list_head *hook_list,
7172 struct nft_flowtable *flowtable)
7174 struct nft_hook *hook, *hook2, *next;
7175 struct nft_flowtable *ft;
7178 list_for_each_entry(hook, hook_list, list) {
7179 list_for_each_entry(ft, &table->flowtables, list) {
7180 if (!nft_is_active_next(net, ft))
7183 list_for_each_entry(hook2, &ft->hook_list, list) {
7184 if (hook->ops.dev == hook2->ops.dev &&
7185 hook->ops.pf == hook2->ops.pf) {
7187 goto err_unregister_net_hooks;
7192 err = flowtable->data.type->setup(&flowtable->data,
7196 goto err_unregister_net_hooks;
7198 err = nf_register_net_hook(net, &hook->ops);
7200 flowtable->data.type->setup(&flowtable->data,
7203 goto err_unregister_net_hooks;
7211 err_unregister_net_hooks:
7212 list_for_each_entry_safe(hook, next, hook_list, list) {
7216 nft_unregister_flowtable_hook(net, flowtable, hook);
7217 list_del_rcu(&hook->list);
7218 kfree_rcu(hook, rcu);
7224 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7226 struct nft_hook *hook, *next;
7228 list_for_each_entry_safe(hook, next, hook_list, list) {
7229 list_del_rcu(&hook->list);
7230 kfree_rcu(hook, rcu);
7234 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7235 struct nft_flowtable *flowtable)
7237 const struct nlattr * const *nla = ctx->nla;
7238 struct nft_flowtable_hook flowtable_hook;
7239 struct nft_hook *hook, *next;
7240 struct nft_trans *trans;
7241 bool unregister = false;
7245 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7246 &flowtable_hook, flowtable, false);
7250 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7251 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7252 list_del(&hook->list);
7257 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7258 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7259 if (flags & ~NFT_FLOWTABLE_MASK)
7261 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7262 (flags & NFT_FLOWTABLE_HW_OFFLOAD))
7265 flags = flowtable->data.flags;
7268 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7269 &flowtable_hook.list, flowtable);
7271 goto err_flowtable_update_hook;
7273 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7274 sizeof(struct nft_trans_flowtable));
7278 goto err_flowtable_update_hook;
7281 nft_trans_flowtable_flags(trans) = flags;
7282 nft_trans_flowtable(trans) = flowtable;
7283 nft_trans_flowtable_update(trans) = true;
7284 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7285 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7287 nft_trans_commit_list_add_tail(ctx->net, trans);
7291 err_flowtable_update_hook:
7292 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7294 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7295 list_del_rcu(&hook->list);
7296 kfree_rcu(hook, rcu);
7303 static int nf_tables_newflowtable(struct sk_buff *skb,
7304 const struct nfnl_info *info,
7305 const struct nlattr * const nla[])
7307 struct netlink_ext_ack *extack = info->extack;
7308 struct nft_flowtable_hook flowtable_hook;
7309 u8 genmask = nft_genmask_next(info->net);
7310 u8 family = info->nfmsg->nfgen_family;
7311 const struct nf_flowtable_type *type;
7312 struct nft_flowtable *flowtable;
7313 struct nft_hook *hook, *next;
7314 struct net *net = info->net;
7315 struct nft_table *table;
7319 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7320 !nla[NFTA_FLOWTABLE_NAME] ||
7321 !nla[NFTA_FLOWTABLE_HOOK])
7324 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7325 genmask, NETLINK_CB(skb).portid);
7326 if (IS_ERR(table)) {
7327 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7328 return PTR_ERR(table);
7331 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7333 if (IS_ERR(flowtable)) {
7334 err = PTR_ERR(flowtable);
7335 if (err != -ENOENT) {
7336 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7340 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7341 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7345 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7347 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7350 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7352 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
7356 flowtable->table = table;
7357 flowtable->handle = nf_tables_alloc_handle(table);
7358 INIT_LIST_HEAD(&flowtable->hook_list);
7360 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
7361 if (!flowtable->name) {
7366 type = nft_flowtable_type_get(net, family);
7368 err = PTR_ERR(type);
7372 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7373 flowtable->data.flags =
7374 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7375 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7381 write_pnet(&flowtable->data.net, net);
7382 flowtable->data.type = type;
7383 err = type->init(&flowtable->data);
7387 err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7388 &flowtable_hook, flowtable, true);
7392 list_splice(&flowtable_hook.list, &flowtable->hook_list);
7393 flowtable->data.priority = flowtable_hook.priority;
7394 flowtable->hooknum = flowtable_hook.num;
7396 err = nft_register_flowtable_net_hooks(ctx.net, table,
7397 &flowtable->hook_list,
7400 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7404 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7408 list_add_tail_rcu(&flowtable->list, &table->flowtables);
7413 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7414 nft_unregister_flowtable_hook(net, flowtable, hook);
7415 list_del_rcu(&hook->list);
7416 kfree_rcu(hook, rcu);
7419 flowtable->data.type->free(&flowtable->data);
7421 module_put(type->owner);
7423 kfree(flowtable->name);
7429 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7431 struct nft_hook *this, *next;
7433 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7434 list_del(&this->list);
7439 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7440 struct nft_flowtable *flowtable)
7442 const struct nlattr * const *nla = ctx->nla;
7443 struct nft_flowtable_hook flowtable_hook;
7444 struct nft_hook *this, *hook;
7445 struct nft_trans *trans;
7448 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7449 &flowtable_hook, flowtable, false);
7453 list_for_each_entry(this, &flowtable_hook.list, list) {
7454 hook = nft_hook_list_find(&flowtable->hook_list, this);
7457 goto err_flowtable_del_hook;
7459 hook->inactive = true;
7462 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7463 sizeof(struct nft_trans_flowtable));
7466 goto err_flowtable_del_hook;
7469 nft_trans_flowtable(trans) = flowtable;
7470 nft_trans_flowtable_update(trans) = true;
7471 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7472 nft_flowtable_hook_release(&flowtable_hook);
7474 nft_trans_commit_list_add_tail(ctx->net, trans);
7478 err_flowtable_del_hook:
7479 list_for_each_entry(this, &flowtable_hook.list, list) {
7480 hook = nft_hook_list_find(&flowtable->hook_list, this);
7484 hook->inactive = false;
7486 nft_flowtable_hook_release(&flowtable_hook);
7491 static int nf_tables_delflowtable(struct sk_buff *skb,
7492 const struct nfnl_info *info,
7493 const struct nlattr * const nla[])
7495 struct netlink_ext_ack *extack = info->extack;
7496 u8 genmask = nft_genmask_next(info->net);
7497 u8 family = info->nfmsg->nfgen_family;
7498 struct nft_flowtable *flowtable;
7499 struct net *net = info->net;
7500 const struct nlattr *attr;
7501 struct nft_table *table;
7504 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7505 (!nla[NFTA_FLOWTABLE_NAME] &&
7506 !nla[NFTA_FLOWTABLE_HANDLE]))
7509 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7510 genmask, NETLINK_CB(skb).portid);
7511 if (IS_ERR(table)) {
7512 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7513 return PTR_ERR(table);
7516 if (nla[NFTA_FLOWTABLE_HANDLE]) {
7517 attr = nla[NFTA_FLOWTABLE_HANDLE];
7518 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7520 attr = nla[NFTA_FLOWTABLE_NAME];
7521 flowtable = nft_flowtable_lookup(table, attr, genmask);
7524 if (IS_ERR(flowtable)) {
7525 NL_SET_BAD_ATTR(extack, attr);
7526 return PTR_ERR(flowtable);
7529 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7531 if (nla[NFTA_FLOWTABLE_HOOK])
7532 return nft_delflowtable_hook(&ctx, flowtable);
7534 if (flowtable->use > 0) {
7535 NL_SET_BAD_ATTR(extack, attr);
7539 return nft_delflowtable(&ctx, flowtable);
7542 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7543 u32 portid, u32 seq, int event,
7544 u32 flags, int family,
7545 struct nft_flowtable *flowtable,
7546 struct list_head *hook_list)
7548 struct nlattr *nest, *nest_devs;
7549 struct nft_hook *hook;
7550 struct nlmsghdr *nlh;
7552 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7553 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7554 NFNETLINK_V0, nft_base_seq(net));
7556 goto nla_put_failure;
7558 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7559 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7560 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7561 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7562 NFTA_FLOWTABLE_PAD) ||
7563 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7564 goto nla_put_failure;
7566 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7568 goto nla_put_failure;
7569 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7570 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7571 goto nla_put_failure;
7573 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7575 goto nla_put_failure;
7577 list_for_each_entry_rcu(hook, hook_list, list) {
7578 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7579 goto nla_put_failure;
7581 nla_nest_end(skb, nest_devs);
7582 nla_nest_end(skb, nest);
7584 nlmsg_end(skb, nlh);
7588 nlmsg_trim(skb, nlh);
7592 struct nft_flowtable_filter {
7596 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7597 struct netlink_callback *cb)
7599 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7600 struct nft_flowtable_filter *filter = cb->data;
7601 unsigned int idx = 0, s_idx = cb->args[0];
7602 struct net *net = sock_net(skb->sk);
7603 int family = nfmsg->nfgen_family;
7604 struct nft_flowtable *flowtable;
7605 struct nftables_pernet *nft_net;
7606 const struct nft_table *table;
7609 nft_net = nft_pernet(net);
7610 cb->seq = nft_net->base_seq;
7612 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7613 if (family != NFPROTO_UNSPEC && family != table->family)
7616 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7617 if (!nft_is_active(net, flowtable))
7622 memset(&cb->args[1], 0,
7623 sizeof(cb->args) - sizeof(cb->args[0]));
7624 if (filter && filter->table &&
7625 strcmp(filter->table, table->name))
7628 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7630 NFT_MSG_NEWFLOWTABLE,
7631 NLM_F_MULTI | NLM_F_APPEND,
7634 &flowtable->hook_list) < 0)
7637 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7649 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7651 const struct nlattr * const *nla = cb->data;
7652 struct nft_flowtable_filter *filter = NULL;
7654 if (nla[NFTA_FLOWTABLE_TABLE]) {
7655 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7659 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7661 if (!filter->table) {
7671 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7673 struct nft_flowtable_filter *filter = cb->data;
7678 kfree(filter->table);
7684 /* called with rcu_read_lock held */
7685 static int nf_tables_getflowtable(struct sk_buff *skb,
7686 const struct nfnl_info *info,
7687 const struct nlattr * const nla[])
7689 u8 genmask = nft_genmask_cur(info->net);
7690 u8 family = info->nfmsg->nfgen_family;
7691 struct nft_flowtable *flowtable;
7692 const struct nft_table *table;
7693 struct net *net = info->net;
7694 struct sk_buff *skb2;
7697 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7698 struct netlink_dump_control c = {
7699 .start = nf_tables_dump_flowtable_start,
7700 .dump = nf_tables_dump_flowtable,
7701 .done = nf_tables_dump_flowtable_done,
7702 .module = THIS_MODULE,
7703 .data = (void *)nla,
7706 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7709 if (!nla[NFTA_FLOWTABLE_NAME])
7712 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7715 return PTR_ERR(table);
7717 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7719 if (IS_ERR(flowtable))
7720 return PTR_ERR(flowtable);
7722 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7726 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7727 info->nlh->nlmsg_seq,
7728 NFT_MSG_NEWFLOWTABLE, 0, family,
7729 flowtable, &flowtable->hook_list);
7731 goto err_fill_flowtable_info;
7733 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7735 err_fill_flowtable_info:
7740 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7741 struct nft_flowtable *flowtable,
7742 struct list_head *hook_list,
7745 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
7746 struct sk_buff *skb;
7750 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7753 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7757 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7759 ctx->family, flowtable, hook_list);
7765 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
7768 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7771 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7773 struct nft_hook *hook, *next;
7775 flowtable->data.type->free(&flowtable->data);
7776 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7777 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7779 list_del_rcu(&hook->list);
7782 kfree(flowtable->name);
7783 module_put(flowtable->data.type->owner);
7787 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7788 u32 portid, u32 seq)
7790 struct nftables_pernet *nft_net = nft_pernet(net);
7791 struct nlmsghdr *nlh;
7792 char buf[TASK_COMM_LEN];
7793 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7795 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
7796 NFNETLINK_V0, nft_base_seq(net));
7798 goto nla_put_failure;
7800 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
7801 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7802 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7803 goto nla_put_failure;
7805 nlmsg_end(skb, nlh);
7809 nlmsg_trim(skb, nlh);
7813 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7814 struct nft_flowtable *flowtable)
7816 struct nft_hook *hook;
7818 list_for_each_entry(hook, &flowtable->hook_list, list) {
7819 if (hook->ops.dev != dev)
7822 /* flow_offload_netdev_event() cleans up entries for us. */
7823 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
7824 list_del_rcu(&hook->list);
7825 kfree_rcu(hook, rcu);
7830 static int nf_tables_flowtable_event(struct notifier_block *this,
7831 unsigned long event, void *ptr)
7833 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7834 struct nft_flowtable *flowtable;
7835 struct nftables_pernet *nft_net;
7836 struct nft_table *table;
7839 if (event != NETDEV_UNREGISTER)
7843 nft_net = nft_pernet(net);
7844 mutex_lock(&nft_net->commit_mutex);
7845 list_for_each_entry(table, &nft_net->tables, list) {
7846 list_for_each_entry(flowtable, &table->flowtables, list) {
7847 nft_flowtable_event(event, dev, flowtable);
7850 mutex_unlock(&nft_net->commit_mutex);
7855 static struct notifier_block nf_tables_flowtable_notifier = {
7856 .notifier_call = nf_tables_flowtable_event,
7859 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
7862 struct nlmsghdr *nlh = nlmsg_hdr(skb);
7863 struct sk_buff *skb2;
7866 if (!nlmsg_report(nlh) &&
7867 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7870 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7874 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7881 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7882 nlmsg_report(nlh), GFP_KERNEL);
7885 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7889 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
7890 const struct nlattr * const nla[])
7892 struct sk_buff *skb2;
7895 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7899 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
7900 info->nlh->nlmsg_seq);
7902 goto err_fill_gen_info;
7904 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
7911 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
7912 [NFT_MSG_NEWTABLE] = {
7913 .call = nf_tables_newtable,
7914 .type = NFNL_CB_BATCH,
7915 .attr_count = NFTA_TABLE_MAX,
7916 .policy = nft_table_policy,
7918 [NFT_MSG_GETTABLE] = {
7919 .call = nf_tables_gettable,
7920 .type = NFNL_CB_RCU,
7921 .attr_count = NFTA_TABLE_MAX,
7922 .policy = nft_table_policy,
7924 [NFT_MSG_DELTABLE] = {
7925 .call = nf_tables_deltable,
7926 .type = NFNL_CB_BATCH,
7927 .attr_count = NFTA_TABLE_MAX,
7928 .policy = nft_table_policy,
7930 [NFT_MSG_NEWCHAIN] = {
7931 .call = nf_tables_newchain,
7932 .type = NFNL_CB_BATCH,
7933 .attr_count = NFTA_CHAIN_MAX,
7934 .policy = nft_chain_policy,
7936 [NFT_MSG_GETCHAIN] = {
7937 .call = nf_tables_getchain,
7938 .type = NFNL_CB_RCU,
7939 .attr_count = NFTA_CHAIN_MAX,
7940 .policy = nft_chain_policy,
7942 [NFT_MSG_DELCHAIN] = {
7943 .call = nf_tables_delchain,
7944 .type = NFNL_CB_BATCH,
7945 .attr_count = NFTA_CHAIN_MAX,
7946 .policy = nft_chain_policy,
7948 [NFT_MSG_NEWRULE] = {
7949 .call = nf_tables_newrule,
7950 .type = NFNL_CB_BATCH,
7951 .attr_count = NFTA_RULE_MAX,
7952 .policy = nft_rule_policy,
7954 [NFT_MSG_GETRULE] = {
7955 .call = nf_tables_getrule,
7956 .type = NFNL_CB_RCU,
7957 .attr_count = NFTA_RULE_MAX,
7958 .policy = nft_rule_policy,
7960 [NFT_MSG_DELRULE] = {
7961 .call = nf_tables_delrule,
7962 .type = NFNL_CB_BATCH,
7963 .attr_count = NFTA_RULE_MAX,
7964 .policy = nft_rule_policy,
7966 [NFT_MSG_NEWSET] = {
7967 .call = nf_tables_newset,
7968 .type = NFNL_CB_BATCH,
7969 .attr_count = NFTA_SET_MAX,
7970 .policy = nft_set_policy,
7972 [NFT_MSG_GETSET] = {
7973 .call = nf_tables_getset,
7974 .type = NFNL_CB_RCU,
7975 .attr_count = NFTA_SET_MAX,
7976 .policy = nft_set_policy,
7978 [NFT_MSG_DELSET] = {
7979 .call = nf_tables_delset,
7980 .type = NFNL_CB_BATCH,
7981 .attr_count = NFTA_SET_MAX,
7982 .policy = nft_set_policy,
7984 [NFT_MSG_NEWSETELEM] = {
7985 .call = nf_tables_newsetelem,
7986 .type = NFNL_CB_BATCH,
7987 .attr_count = NFTA_SET_ELEM_LIST_MAX,
7988 .policy = nft_set_elem_list_policy,
7990 [NFT_MSG_GETSETELEM] = {
7991 .call = nf_tables_getsetelem,
7992 .type = NFNL_CB_RCU,
7993 .attr_count = NFTA_SET_ELEM_LIST_MAX,
7994 .policy = nft_set_elem_list_policy,
7996 [NFT_MSG_DELSETELEM] = {
7997 .call = nf_tables_delsetelem,
7998 .type = NFNL_CB_BATCH,
7999 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8000 .policy = nft_set_elem_list_policy,
8002 [NFT_MSG_GETGEN] = {
8003 .call = nf_tables_getgen,
8004 .type = NFNL_CB_RCU,
8006 [NFT_MSG_NEWOBJ] = {
8007 .call = nf_tables_newobj,
8008 .type = NFNL_CB_BATCH,
8009 .attr_count = NFTA_OBJ_MAX,
8010 .policy = nft_obj_policy,
8012 [NFT_MSG_GETOBJ] = {
8013 .call = nf_tables_getobj,
8014 .type = NFNL_CB_RCU,
8015 .attr_count = NFTA_OBJ_MAX,
8016 .policy = nft_obj_policy,
8018 [NFT_MSG_DELOBJ] = {
8019 .call = nf_tables_delobj,
8020 .type = NFNL_CB_BATCH,
8021 .attr_count = NFTA_OBJ_MAX,
8022 .policy = nft_obj_policy,
8024 [NFT_MSG_GETOBJ_RESET] = {
8025 .call = nf_tables_getobj,
8026 .type = NFNL_CB_RCU,
8027 .attr_count = NFTA_OBJ_MAX,
8028 .policy = nft_obj_policy,
8030 [NFT_MSG_NEWFLOWTABLE] = {
8031 .call = nf_tables_newflowtable,
8032 .type = NFNL_CB_BATCH,
8033 .attr_count = NFTA_FLOWTABLE_MAX,
8034 .policy = nft_flowtable_policy,
8036 [NFT_MSG_GETFLOWTABLE] = {
8037 .call = nf_tables_getflowtable,
8038 .type = NFNL_CB_RCU,
8039 .attr_count = NFTA_FLOWTABLE_MAX,
8040 .policy = nft_flowtable_policy,
8042 [NFT_MSG_DELFLOWTABLE] = {
8043 .call = nf_tables_delflowtable,
8044 .type = NFNL_CB_BATCH,
8045 .attr_count = NFTA_FLOWTABLE_MAX,
8046 .policy = nft_flowtable_policy,
8050 static int nf_tables_validate(struct net *net)
8052 struct nftables_pernet *nft_net = nft_pernet(net);
8053 struct nft_table *table;
8055 switch (nft_net->validate_state) {
8056 case NFT_VALIDATE_SKIP:
8058 case NFT_VALIDATE_NEED:
8059 nft_validate_state_update(net, NFT_VALIDATE_DO);
8061 case NFT_VALIDATE_DO:
8062 list_for_each_entry(table, &nft_net->tables, list) {
8063 if (nft_table_validate(net, table) < 0)
8072 /* a drop policy has to be deferred until all rules have been activated,
8073 * otherwise a large ruleset that contains a drop-policy base chain will
8074 * cause all packets to get dropped until the full transaction has been
8077 * We defer the drop policy until the transaction has been finalized.
8079 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8081 struct nft_base_chain *basechain;
8083 if (nft_trans_chain_policy(trans) != NF_DROP)
8086 if (!nft_is_base_chain(trans->ctx.chain))
8089 basechain = nft_base_chain(trans->ctx.chain);
8090 basechain->policy = NF_DROP;
8093 static void nft_chain_commit_update(struct nft_trans *trans)
8095 struct nft_base_chain *basechain;
8097 if (nft_trans_chain_name(trans)) {
8098 rhltable_remove(&trans->ctx.table->chains_ht,
8099 &trans->ctx.chain->rhlhead,
8100 nft_chain_ht_params);
8101 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8102 rhltable_insert_key(&trans->ctx.table->chains_ht,
8103 trans->ctx.chain->name,
8104 &trans->ctx.chain->rhlhead,
8105 nft_chain_ht_params);
8108 if (!nft_is_base_chain(trans->ctx.chain))
8111 nft_chain_stats_replace(trans);
8113 basechain = nft_base_chain(trans->ctx.chain);
8115 switch (nft_trans_chain_policy(trans)) {
8118 basechain->policy = nft_trans_chain_policy(trans);
8123 static void nft_obj_commit_update(struct nft_trans *trans)
8125 struct nft_object *newobj;
8126 struct nft_object *obj;
8128 obj = nft_trans_obj(trans);
8129 newobj = nft_trans_obj_newobj(trans);
8131 if (obj->ops->update)
8132 obj->ops->update(obj, newobj);
8137 static void nft_commit_release(struct nft_trans *trans)
8139 switch (trans->msg_type) {
8140 case NFT_MSG_DELTABLE:
8141 nf_tables_table_destroy(&trans->ctx);
8143 case NFT_MSG_NEWCHAIN:
8144 free_percpu(nft_trans_chain_stats(trans));
8145 kfree(nft_trans_chain_name(trans));
8147 case NFT_MSG_DELCHAIN:
8148 nf_tables_chain_destroy(&trans->ctx);
8150 case NFT_MSG_DELRULE:
8151 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8153 case NFT_MSG_DELSET:
8154 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8156 case NFT_MSG_DELSETELEM:
8157 nf_tables_set_elem_destroy(&trans->ctx,
8158 nft_trans_elem_set(trans),
8159 nft_trans_elem(trans).priv);
8161 case NFT_MSG_DELOBJ:
8162 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8164 case NFT_MSG_DELFLOWTABLE:
8165 if (nft_trans_flowtable_update(trans))
8166 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8168 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8173 put_net(trans->ctx.net);
8178 static void nf_tables_trans_destroy_work(struct work_struct *w)
8180 struct nft_trans *trans, *next;
8183 spin_lock(&nf_tables_destroy_list_lock);
8184 list_splice_init(&nf_tables_destroy_list, &head);
8185 spin_unlock(&nf_tables_destroy_list_lock);
8187 if (list_empty(&head))
8192 list_for_each_entry_safe(trans, next, &head, list) {
8193 list_del(&trans->list);
8194 nft_commit_release(trans);
8198 void nf_tables_trans_destroy_flush_work(void)
8200 flush_work(&trans_destroy_work);
8202 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8204 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8206 struct nft_rule *rule;
8207 unsigned int alloc = 0;
8210 /* already handled or inactive chain? */
8211 if (chain->rules_next || !nft_is_active_next(net, chain))
8214 rule = list_entry(&chain->rules, struct nft_rule, list);
8217 list_for_each_entry_continue(rule, &chain->rules, list) {
8218 if (nft_is_active_next(net, rule))
8222 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
8223 if (!chain->rules_next)
8226 list_for_each_entry_continue(rule, &chain->rules, list) {
8227 if (nft_is_active_next(net, rule))
8228 chain->rules_next[i++] = rule;
8231 chain->rules_next[i] = NULL;
8235 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8237 struct nftables_pernet *nft_net = nft_pernet(net);
8238 struct nft_trans *trans, *next;
8240 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8241 struct nft_chain *chain = trans->ctx.chain;
8243 if (trans->msg_type == NFT_MSG_NEWRULE ||
8244 trans->msg_type == NFT_MSG_DELRULE) {
8245 kvfree(chain->rules_next);
8246 chain->rules_next = NULL;
8251 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8253 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8258 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
8260 struct nft_rule **r = rules;
8261 struct nft_rules_old *old;
8266 r++; /* rcu_head is after end marker */
8270 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8273 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8275 struct nft_rule **g0, **g1;
8278 next_genbit = nft_gencursor_next(net);
8280 g0 = rcu_dereference_protected(chain->rules_gen_0,
8281 lockdep_commit_lock_is_held(net));
8282 g1 = rcu_dereference_protected(chain->rules_gen_1,
8283 lockdep_commit_lock_is_held(net));
8285 /* No changes to this chain? */
8286 if (chain->rules_next == NULL) {
8287 /* chain had no change in last or next generation */
8291 * chain had no change in this generation; make sure next
8292 * one uses same rules as current generation.
8295 rcu_assign_pointer(chain->rules_gen_1, g0);
8296 nf_tables_commit_chain_free_rules_old(g1);
8298 rcu_assign_pointer(chain->rules_gen_0, g1);
8299 nf_tables_commit_chain_free_rules_old(g0);
8306 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
8308 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
8310 chain->rules_next = NULL;
8316 nf_tables_commit_chain_free_rules_old(g1);
8318 nf_tables_commit_chain_free_rules_old(g0);
8321 static void nft_obj_del(struct nft_object *obj)
8323 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8324 list_del_rcu(&obj->list);
8327 void nft_chain_del(struct nft_chain *chain)
8329 struct nft_table *table = chain->table;
8331 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8332 nft_chain_ht_params));
8333 list_del_rcu(&chain->list);
8336 static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
8337 struct list_head *hook_list)
8339 struct nft_hook *hook, *next;
8341 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8343 list_move(&hook->list, hook_list);
8347 static void nf_tables_module_autoload_cleanup(struct net *net)
8349 struct nftables_pernet *nft_net = nft_pernet(net);
8350 struct nft_module_request *req, *next;
8352 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8353 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8354 WARN_ON_ONCE(!req->done);
8355 list_del(&req->list);
8360 static void nf_tables_commit_release(struct net *net)
8362 struct nftables_pernet *nft_net = nft_pernet(net);
8363 struct nft_trans *trans;
8365 /* all side effects have to be made visible.
8366 * For example, if a chain named 'foo' has been deleted, a
8367 * new transaction must not find it anymore.
8369 * Memory reclaim happens asynchronously from work queue
8370 * to prevent expensive synchronize_rcu() in commit phase.
8372 if (list_empty(&nft_net->commit_list)) {
8373 nf_tables_module_autoload_cleanup(net);
8374 mutex_unlock(&nft_net->commit_mutex);
8378 trans = list_last_entry(&nft_net->commit_list,
8379 struct nft_trans, list);
8380 get_net(trans->ctx.net);
8381 WARN_ON_ONCE(trans->put_net);
8383 trans->put_net = true;
8384 spin_lock(&nf_tables_destroy_list_lock);
8385 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
8386 spin_unlock(&nf_tables_destroy_list_lock);
8388 nf_tables_module_autoload_cleanup(net);
8389 schedule_work(&trans_destroy_work);
8391 mutex_unlock(&nft_net->commit_mutex);
8394 static void nft_commit_notify(struct net *net, u32 portid)
8396 struct nftables_pernet *nft_net = nft_pernet(net);
8397 struct sk_buff *batch_skb = NULL, *nskb, *skb;
8398 unsigned char *data;
8401 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
8405 len = NLMSG_GOODSIZE - skb->len;
8406 list_del(&skb->list);
8410 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8411 data = skb_put(batch_skb, skb->len);
8412 memcpy(data, skb->data, skb->len);
8413 list_del(&skb->list);
8417 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8418 NFT_CB(batch_skb).report, GFP_KERNEL);
8423 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8424 NFT_CB(batch_skb).report, GFP_KERNEL);
8427 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
8430 static int nf_tables_commit_audit_alloc(struct list_head *adl,
8431 struct nft_table *table)
8433 struct nft_audit_data *adp;
8435 list_for_each_entry(adp, adl, list) {
8436 if (adp->table == table)
8439 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
8443 list_add(&adp->list, adl);
8447 static void nf_tables_commit_audit_collect(struct list_head *adl,
8448 struct nft_table *table, u32 op)
8450 struct nft_audit_data *adp;
8452 list_for_each_entry(adp, adl, list) {
8453 if (adp->table == table)
8456 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
8460 if (!adp->op || adp->op > op)
8464 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
8466 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
8468 struct nft_audit_data *adp, *adn;
8469 char aubuf[AUNFTABLENAMELEN];
8471 list_for_each_entry_safe(adp, adn, adl, list) {
8472 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
8474 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
8475 nft2audit_op[adp->op], GFP_KERNEL);
8476 list_del(&adp->list);
8481 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8483 struct nftables_pernet *nft_net = nft_pernet(net);
8484 struct nft_trans *trans, *next;
8485 struct nft_trans_elem *te;
8486 struct nft_chain *chain;
8487 struct nft_table *table;
8491 if (list_empty(&nft_net->commit_list)) {
8492 mutex_unlock(&nft_net->commit_mutex);
8496 /* 0. Validate ruleset, otherwise roll back for error reporting. */
8497 if (nf_tables_validate(net) < 0)
8500 err = nft_flow_rule_offload_commit(net);
8504 /* 1. Allocate space for next generation rules_gen_X[] */
8505 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8508 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
8510 nf_tables_commit_chain_prepare_cancel(net);
8513 if (trans->msg_type == NFT_MSG_NEWRULE ||
8514 trans->msg_type == NFT_MSG_DELRULE) {
8515 chain = trans->ctx.chain;
8517 ret = nf_tables_commit_chain_prepare(net, chain);
8519 nf_tables_commit_chain_prepare_cancel(net);
8525 /* step 2. Make rules_gen_X visible to packet path */
8526 list_for_each_entry(table, &nft_net->tables, list) {
8527 list_for_each_entry(chain, &table->chains, list)
8528 nf_tables_commit_chain(net, chain);
8532 * Bump generation counter, invalidate any dump in progress.
8533 * Cannot fail after this point.
8535 while (++nft_net->base_seq == 0)
8538 /* step 3. Start new generation, rules_gen_X now in use. */
8539 net->nft.gencursor = nft_gencursor_next(net);
8541 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8542 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
8544 switch (trans->msg_type) {
8545 case NFT_MSG_NEWTABLE:
8546 if (nft_trans_table_update(trans)) {
8547 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8548 nft_trans_destroy(trans);
8551 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
8552 nf_tables_table_disable(net, trans->ctx.table);
8554 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8556 nft_clear(net, trans->ctx.table);
8558 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8559 nft_trans_destroy(trans);
8561 case NFT_MSG_DELTABLE:
8562 list_del_rcu(&trans->ctx.table->list);
8563 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8565 case NFT_MSG_NEWCHAIN:
8566 if (nft_trans_chain_update(trans)) {
8567 nft_chain_commit_update(trans);
8568 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8569 /* trans destroyed after rcu grace period */
8571 nft_chain_commit_drop_policy(trans);
8572 nft_clear(net, trans->ctx.chain);
8573 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8574 nft_trans_destroy(trans);
8577 case NFT_MSG_DELCHAIN:
8578 nft_chain_del(trans->ctx.chain);
8579 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8580 nf_tables_unregister_hook(trans->ctx.net,
8584 case NFT_MSG_NEWRULE:
8585 nft_clear(trans->ctx.net, nft_trans_rule(trans));
8586 nf_tables_rule_notify(&trans->ctx,
8587 nft_trans_rule(trans),
8589 nft_trans_destroy(trans);
8591 case NFT_MSG_DELRULE:
8592 list_del_rcu(&nft_trans_rule(trans)->list);
8593 nf_tables_rule_notify(&trans->ctx,
8594 nft_trans_rule(trans),
8596 nft_rule_expr_deactivate(&trans->ctx,
8597 nft_trans_rule(trans),
8600 case NFT_MSG_NEWSET:
8601 nft_clear(net, nft_trans_set(trans));
8602 /* This avoids hitting -EBUSY when deleting the table
8603 * from the transaction.
8605 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8606 !list_empty(&nft_trans_set(trans)->bindings))
8607 trans->ctx.table->use--;
8609 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8610 NFT_MSG_NEWSET, GFP_KERNEL);
8611 nft_trans_destroy(trans);
8613 case NFT_MSG_DELSET:
8614 list_del_rcu(&nft_trans_set(trans)->list);
8615 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8616 NFT_MSG_DELSET, GFP_KERNEL);
8618 case NFT_MSG_NEWSETELEM:
8619 te = (struct nft_trans_elem *)trans->data;
8621 nft_setelem_activate(net, te->set, &te->elem);
8622 nf_tables_setelem_notify(&trans->ctx, te->set,
8624 NFT_MSG_NEWSETELEM, 0);
8625 nft_trans_destroy(trans);
8627 case NFT_MSG_DELSETELEM:
8628 te = (struct nft_trans_elem *)trans->data;
8630 nf_tables_setelem_notify(&trans->ctx, te->set,
8632 NFT_MSG_DELSETELEM, 0);
8633 nft_setelem_remove(net, te->set, &te->elem);
8634 if (!nft_setelem_is_catchall(te->set, &te->elem)) {
8635 atomic_dec(&te->set->nelems);
8639 case NFT_MSG_NEWOBJ:
8640 if (nft_trans_obj_update(trans)) {
8641 nft_obj_commit_update(trans);
8642 nf_tables_obj_notify(&trans->ctx,
8643 nft_trans_obj(trans),
8646 nft_clear(net, nft_trans_obj(trans));
8647 nf_tables_obj_notify(&trans->ctx,
8648 nft_trans_obj(trans),
8650 nft_trans_destroy(trans);
8653 case NFT_MSG_DELOBJ:
8654 nft_obj_del(nft_trans_obj(trans));
8655 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8658 case NFT_MSG_NEWFLOWTABLE:
8659 if (nft_trans_flowtable_update(trans)) {
8660 nft_trans_flowtable(trans)->data.flags =
8661 nft_trans_flowtable_flags(trans);
8662 nf_tables_flowtable_notify(&trans->ctx,
8663 nft_trans_flowtable(trans),
8664 &nft_trans_flowtable_hooks(trans),
8665 NFT_MSG_NEWFLOWTABLE);
8666 list_splice(&nft_trans_flowtable_hooks(trans),
8667 &nft_trans_flowtable(trans)->hook_list);
8669 nft_clear(net, nft_trans_flowtable(trans));
8670 nf_tables_flowtable_notify(&trans->ctx,
8671 nft_trans_flowtable(trans),
8672 &nft_trans_flowtable(trans)->hook_list,
8673 NFT_MSG_NEWFLOWTABLE);
8675 nft_trans_destroy(trans);
8677 case NFT_MSG_DELFLOWTABLE:
8678 if (nft_trans_flowtable_update(trans)) {
8679 nft_flowtable_hooks_del(nft_trans_flowtable(trans),
8680 &nft_trans_flowtable_hooks(trans));
8681 nf_tables_flowtable_notify(&trans->ctx,
8682 nft_trans_flowtable(trans),
8683 &nft_trans_flowtable_hooks(trans),
8684 NFT_MSG_DELFLOWTABLE);
8685 nft_unregister_flowtable_net_hooks(net,
8686 &nft_trans_flowtable_hooks(trans));
8688 list_del_rcu(&nft_trans_flowtable(trans)->list);
8689 nf_tables_flowtable_notify(&trans->ctx,
8690 nft_trans_flowtable(trans),
8691 &nft_trans_flowtable(trans)->hook_list,
8692 NFT_MSG_DELFLOWTABLE);
8693 nft_unregister_flowtable_net_hooks(net,
8694 &nft_trans_flowtable(trans)->hook_list);
8700 nft_commit_notify(net, NETLINK_CB(skb).portid);
8701 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8702 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
8703 nf_tables_commit_release(net);
8708 static void nf_tables_module_autoload(struct net *net)
8710 struct nftables_pernet *nft_net = nft_pernet(net);
8711 struct nft_module_request *req, *next;
8712 LIST_HEAD(module_list);
8714 list_splice_init(&nft_net->module_list, &module_list);
8715 mutex_unlock(&nft_net->commit_mutex);
8716 list_for_each_entry_safe(req, next, &module_list, list) {
8717 request_module("%s", req->module);
8720 mutex_lock(&nft_net->commit_mutex);
8721 list_splice(&module_list, &nft_net->module_list);
8724 static void nf_tables_abort_release(struct nft_trans *trans)
8726 switch (trans->msg_type) {
8727 case NFT_MSG_NEWTABLE:
8728 nf_tables_table_destroy(&trans->ctx);
8730 case NFT_MSG_NEWCHAIN:
8731 nf_tables_chain_destroy(&trans->ctx);
8733 case NFT_MSG_NEWRULE:
8734 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8736 case NFT_MSG_NEWSET:
8737 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8739 case NFT_MSG_NEWSETELEM:
8740 nft_set_elem_destroy(nft_trans_elem_set(trans),
8741 nft_trans_elem(trans).priv, true);
8743 case NFT_MSG_NEWOBJ:
8744 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8746 case NFT_MSG_NEWFLOWTABLE:
8747 if (nft_trans_flowtable_update(trans))
8748 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8750 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8756 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
8758 struct nftables_pernet *nft_net = nft_pernet(net);
8759 struct nft_trans *trans, *next;
8760 struct nft_trans_elem *te;
8761 struct nft_hook *hook;
8763 if (action == NFNL_ABORT_VALIDATE &&
8764 nf_tables_validate(net) < 0)
8767 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
8769 switch (trans->msg_type) {
8770 case NFT_MSG_NEWTABLE:
8771 if (nft_trans_table_update(trans)) {
8772 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8773 nft_trans_destroy(trans);
8776 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
8777 nf_tables_table_disable(net, trans->ctx.table);
8778 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8779 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
8780 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
8782 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8783 nft_trans_destroy(trans);
8785 list_del_rcu(&trans->ctx.table->list);
8788 case NFT_MSG_DELTABLE:
8789 nft_clear(trans->ctx.net, trans->ctx.table);
8790 nft_trans_destroy(trans);
8792 case NFT_MSG_NEWCHAIN:
8793 if (nft_trans_chain_update(trans)) {
8794 free_percpu(nft_trans_chain_stats(trans));
8795 kfree(nft_trans_chain_name(trans));
8796 nft_trans_destroy(trans);
8798 if (nft_chain_is_bound(trans->ctx.chain)) {
8799 nft_trans_destroy(trans);
8802 trans->ctx.table->use--;
8803 nft_chain_del(trans->ctx.chain);
8804 nf_tables_unregister_hook(trans->ctx.net,
8809 case NFT_MSG_DELCHAIN:
8810 trans->ctx.table->use++;
8811 nft_clear(trans->ctx.net, trans->ctx.chain);
8812 nft_trans_destroy(trans);
8814 case NFT_MSG_NEWRULE:
8815 trans->ctx.chain->use--;
8816 list_del_rcu(&nft_trans_rule(trans)->list);
8817 nft_rule_expr_deactivate(&trans->ctx,
8818 nft_trans_rule(trans),
8820 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8821 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8823 case NFT_MSG_DELRULE:
8824 trans->ctx.chain->use++;
8825 nft_clear(trans->ctx.net, nft_trans_rule(trans));
8826 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
8827 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8828 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8830 nft_trans_destroy(trans);
8832 case NFT_MSG_NEWSET:
8833 trans->ctx.table->use--;
8834 if (nft_trans_set_bound(trans)) {
8835 nft_trans_destroy(trans);
8838 list_del_rcu(&nft_trans_set(trans)->list);
8840 case NFT_MSG_DELSET:
8841 trans->ctx.table->use++;
8842 nft_clear(trans->ctx.net, nft_trans_set(trans));
8843 nft_trans_destroy(trans);
8845 case NFT_MSG_NEWSETELEM:
8846 if (nft_trans_elem_set_bound(trans)) {
8847 nft_trans_destroy(trans);
8850 te = (struct nft_trans_elem *)trans->data;
8851 nft_setelem_remove(net, te->set, &te->elem);
8852 if (!nft_setelem_is_catchall(te->set, &te->elem))
8853 atomic_dec(&te->set->nelems);
8855 case NFT_MSG_DELSETELEM:
8856 te = (struct nft_trans_elem *)trans->data;
8858 nft_setelem_data_activate(net, te->set, &te->elem);
8859 nft_setelem_activate(net, te->set, &te->elem);
8860 if (!nft_setelem_is_catchall(te->set, &te->elem))
8863 nft_trans_destroy(trans);
8865 case NFT_MSG_NEWOBJ:
8866 if (nft_trans_obj_update(trans)) {
8867 kfree(nft_trans_obj_newobj(trans));
8868 nft_trans_destroy(trans);
8870 trans->ctx.table->use--;
8871 nft_obj_del(nft_trans_obj(trans));
8874 case NFT_MSG_DELOBJ:
8875 trans->ctx.table->use++;
8876 nft_clear(trans->ctx.net, nft_trans_obj(trans));
8877 nft_trans_destroy(trans);
8879 case NFT_MSG_NEWFLOWTABLE:
8880 if (nft_trans_flowtable_update(trans)) {
8881 nft_unregister_flowtable_net_hooks(net,
8882 &nft_trans_flowtable_hooks(trans));
8884 trans->ctx.table->use--;
8885 list_del_rcu(&nft_trans_flowtable(trans)->list);
8886 nft_unregister_flowtable_net_hooks(net,
8887 &nft_trans_flowtable(trans)->hook_list);
8890 case NFT_MSG_DELFLOWTABLE:
8891 if (nft_trans_flowtable_update(trans)) {
8892 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
8893 hook->inactive = false;
8895 trans->ctx.table->use++;
8896 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
8898 nft_trans_destroy(trans);
8905 list_for_each_entry_safe_reverse(trans, next,
8906 &nft_net->commit_list, list) {
8907 list_del(&trans->list);
8908 nf_tables_abort_release(trans);
8911 if (action == NFNL_ABORT_AUTOLOAD)
8912 nf_tables_module_autoload(net);
8914 nf_tables_module_autoload_cleanup(net);
8919 static void nf_tables_cleanup(struct net *net)
8921 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
8924 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
8925 enum nfnl_abort_action action)
8927 struct nftables_pernet *nft_net = nft_pernet(net);
8928 int ret = __nf_tables_abort(net, action);
8930 mutex_unlock(&nft_net->commit_mutex);
8935 static bool nf_tables_valid_genid(struct net *net, u32 genid)
8937 struct nftables_pernet *nft_net = nft_pernet(net);
8940 mutex_lock(&nft_net->commit_mutex);
8942 genid_ok = genid == 0 || nft_net->base_seq == genid;
8944 mutex_unlock(&nft_net->commit_mutex);
8946 /* else, commit mutex has to be released by commit or abort function */
8950 static const struct nfnetlink_subsystem nf_tables_subsys = {
8951 .name = "nf_tables",
8952 .subsys_id = NFNL_SUBSYS_NFTABLES,
8953 .cb_count = NFT_MSG_MAX,
8955 .commit = nf_tables_commit,
8956 .abort = nf_tables_abort,
8957 .cleanup = nf_tables_cleanup,
8958 .valid_genid = nf_tables_valid_genid,
8959 .owner = THIS_MODULE,
8962 int nft_chain_validate_dependency(const struct nft_chain *chain,
8963 enum nft_chain_types type)
8965 const struct nft_base_chain *basechain;
8967 if (nft_is_base_chain(chain)) {
8968 basechain = nft_base_chain(chain);
8969 if (basechain->type->type != type)
8974 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
8976 int nft_chain_validate_hooks(const struct nft_chain *chain,
8977 unsigned int hook_flags)
8979 struct nft_base_chain *basechain;
8981 if (nft_is_base_chain(chain)) {
8982 basechain = nft_base_chain(chain);
8984 if ((1 << basechain->ops.hooknum) & hook_flags)
8992 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
8995 * Loop detection - walk through the ruleset beginning at the destination chain
8996 * of a new jump until either the source chain is reached (loop) or all
8997 * reachable chains have been traversed.
8999 * The loop check is performed whenever a new jump verdict is added to an
9000 * expression or verdict map or a verdict map is bound to a new chain.
9003 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9004 const struct nft_chain *chain);
9006 static int nft_check_loops(const struct nft_ctx *ctx,
9007 const struct nft_set_ext *ext)
9009 const struct nft_data *data;
9012 data = nft_set_ext_data(ext);
9013 switch (data->verdict.code) {
9016 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9026 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9027 struct nft_set *set,
9028 const struct nft_set_iter *iter,
9029 struct nft_set_elem *elem)
9031 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9033 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9034 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9037 return nft_check_loops(ctx, ext);
9040 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9041 struct nft_set *set)
9043 u8 genmask = nft_genmask_next(ctx->net);
9044 struct nft_set_elem_catchall *catchall;
9045 struct nft_set_ext *ext;
9048 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9049 ext = nft_set_elem_ext(set, catchall->elem);
9050 if (!nft_set_elem_active(ext, genmask))
9053 ret = nft_check_loops(ctx, ext);
9061 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9062 const struct nft_chain *chain)
9064 const struct nft_rule *rule;
9065 const struct nft_expr *expr, *last;
9066 struct nft_set *set;
9067 struct nft_set_binding *binding;
9068 struct nft_set_iter iter;
9070 if (ctx->chain == chain)
9073 list_for_each_entry(rule, &chain->rules, list) {
9074 nft_rule_for_each_expr(expr, last, rule) {
9075 struct nft_immediate_expr *priv;
9076 const struct nft_data *data;
9079 if (strcmp(expr->ops->type->name, "immediate"))
9082 priv = nft_expr_priv(expr);
9083 if (priv->dreg != NFT_REG_VERDICT)
9087 switch (data->verdict.code) {
9090 err = nf_tables_check_loops(ctx,
9091 data->verdict.chain);
9101 list_for_each_entry(set, &ctx->table->sets, list) {
9102 if (!nft_is_active_next(ctx->net, set))
9104 if (!(set->flags & NFT_SET_MAP) ||
9105 set->dtype != NFT_DATA_VERDICT)
9108 list_for_each_entry(binding, &set->bindings, list) {
9109 if (!(binding->flags & NFT_SET_MAP) ||
9110 binding->chain != chain)
9113 iter.genmask = nft_genmask_next(ctx->net);
9117 iter.fn = nf_tables_loop_check_setelem;
9119 set->ops->walk(ctx, set, &iter);
9121 iter.err = nft_set_catchall_loops(ctx, set);
9132 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
9134 * @attr: netlink attribute to fetch value from
9135 * @max: maximum value to be stored in dest
9136 * @dest: pointer to the variable
9138 * Parse, check and store a given u32 netlink attribute into variable.
9139 * This function returns -ERANGE if the value goes over maximum value.
9140 * Otherwise a 0 is returned and the attribute value is stored in the
9141 * destination variable.
9143 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9147 val = ntohl(nla_get_be32(attr));
9154 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9156 static unsigned int nft_parse_register(const struct nlattr *attr)
9160 reg = ntohl(nla_get_be32(attr));
9162 case NFT_REG_VERDICT...NFT_REG_4:
9163 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9165 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9170 * nft_dump_register - dump a register value to a netlink attribute
9172 * @skb: socket buffer
9173 * @attr: attribute number
9174 * @reg: register number
9176 * Construct a netlink attribute containing the register number. For
9177 * compatibility reasons, register numbers being a multiple of 4 are
9178 * translated to the corresponding 128 bit register numbers.
9180 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9182 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9183 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9185 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9187 return nla_put_be32(skb, attr, htonl(reg));
9189 EXPORT_SYMBOL_GPL(nft_dump_register);
9191 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9193 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9197 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9203 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9208 reg = nft_parse_register(attr);
9209 err = nft_validate_register_load(reg, len);
9216 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9218 static int nft_validate_register_store(const struct nft_ctx *ctx,
9219 enum nft_registers reg,
9220 const struct nft_data *data,
9221 enum nft_data_types type,
9227 case NFT_REG_VERDICT:
9228 if (type != NFT_DATA_VERDICT)
9232 (data->verdict.code == NFT_GOTO ||
9233 data->verdict.code == NFT_JUMP)) {
9234 err = nf_tables_check_loops(ctx, data->verdict.chain);
9241 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9245 if (reg * NFT_REG32_SIZE + len >
9246 sizeof_field(struct nft_regs, data))
9249 if (data != NULL && type != NFT_DATA_VALUE)
9255 int nft_parse_register_store(const struct nft_ctx *ctx,
9256 const struct nlattr *attr, u8 *dreg,
9257 const struct nft_data *data,
9258 enum nft_data_types type, unsigned int len)
9263 reg = nft_parse_register(attr);
9264 err = nft_validate_register_store(ctx, reg, data, type, len);
9271 EXPORT_SYMBOL_GPL(nft_parse_register_store);
9273 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9274 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
9275 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
9276 .len = NFT_CHAIN_MAXNAMELEN - 1 },
9277 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9280 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9281 struct nft_data_desc *desc, const struct nlattr *nla)
9283 u8 genmask = nft_genmask_next(ctx->net);
9284 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9285 struct nft_chain *chain;
9288 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9289 nft_verdict_policy, NULL);
9293 if (!tb[NFTA_VERDICT_CODE])
9295 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9297 switch (data->verdict.code) {
9299 switch (data->verdict.code & NF_VERDICT_MASK) {
9314 if (tb[NFTA_VERDICT_CHAIN]) {
9315 chain = nft_chain_lookup(ctx->net, ctx->table,
9316 tb[NFTA_VERDICT_CHAIN],
9318 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9319 chain = nft_chain_lookup_byid(ctx->net,
9320 tb[NFTA_VERDICT_CHAIN_ID]);
9322 return PTR_ERR(chain);
9328 return PTR_ERR(chain);
9329 if (nft_is_base_chain(chain))
9333 data->verdict.chain = chain;
9337 desc->len = sizeof(data->verdict);
9338 desc->type = NFT_DATA_VERDICT;
9342 static void nft_verdict_uninit(const struct nft_data *data)
9344 struct nft_chain *chain;
9345 struct nft_rule *rule;
9347 switch (data->verdict.code) {
9350 chain = data->verdict.chain;
9353 if (!nft_chain_is_bound(chain))
9356 chain->table->use--;
9357 list_for_each_entry(rule, &chain->rules, list)
9360 nft_chain_del(chain);
9365 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
9367 struct nlattr *nest;
9369 nest = nla_nest_start_noflag(skb, type);
9371 goto nla_put_failure;
9373 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
9374 goto nla_put_failure;
9379 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
9381 goto nla_put_failure;
9383 nla_nest_end(skb, nest);
9390 static int nft_value_init(const struct nft_ctx *ctx,
9391 struct nft_data *data, unsigned int size,
9392 struct nft_data_desc *desc, const struct nlattr *nla)
9402 nla_memcpy(data->data, nla, len);
9403 desc->type = NFT_DATA_VALUE;
9408 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
9411 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
9414 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
9415 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
9416 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
9420 * nft_data_init - parse nf_tables data netlink attributes
9422 * @ctx: context of the expression using the data
9423 * @data: destination struct nft_data
9424 * @size: maximum data length
9425 * @desc: data description
9426 * @nla: netlink attribute containing data
9428 * Parse the netlink data attributes and initialize a struct nft_data.
9429 * The type and length of data are returned in the data description.
9431 * The caller can indicate that it only wants to accept data of type
9432 * NFT_DATA_VALUE by passing NULL for the ctx argument.
9434 int nft_data_init(const struct nft_ctx *ctx,
9435 struct nft_data *data, unsigned int size,
9436 struct nft_data_desc *desc, const struct nlattr *nla)
9438 struct nlattr *tb[NFTA_DATA_MAX + 1];
9441 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
9442 nft_data_policy, NULL);
9446 if (tb[NFTA_DATA_VALUE])
9447 return nft_value_init(ctx, data, size, desc,
9448 tb[NFTA_DATA_VALUE]);
9449 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
9450 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
9453 EXPORT_SYMBOL_GPL(nft_data_init);
9456 * nft_data_release - release a nft_data item
9458 * @data: struct nft_data to release
9459 * @type: type of data
9461 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
9462 * all others need to be released by calling this function.
9464 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
9466 if (type < NFT_DATA_VERDICT)
9469 case NFT_DATA_VERDICT:
9470 return nft_verdict_uninit(data);
9475 EXPORT_SYMBOL_GPL(nft_data_release);
9477 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9478 enum nft_data_types type, unsigned int len)
9480 struct nlattr *nest;
9483 nest = nla_nest_start_noflag(skb, attr);
9488 case NFT_DATA_VALUE:
9489 err = nft_value_dump(skb, data, len);
9491 case NFT_DATA_VERDICT:
9492 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
9499 nla_nest_end(skb, nest);
9502 EXPORT_SYMBOL_GPL(nft_data_dump);
9504 int __nft_release_basechain(struct nft_ctx *ctx)
9506 struct nft_rule *rule, *nr;
9508 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9511 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
9512 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9513 list_del(&rule->list);
9515 nf_tables_rule_release(ctx, rule);
9517 nft_chain_del(ctx->chain);
9519 nf_tables_chain_destroy(ctx);
9523 EXPORT_SYMBOL_GPL(__nft_release_basechain);
9525 static void __nft_release_hook(struct net *net, struct nft_table *table)
9527 struct nft_chain *chain;
9529 list_for_each_entry(chain, &table->chains, list)
9530 nf_tables_unregister_hook(net, table, chain);
9533 static void __nft_release_hooks(struct net *net)
9535 struct nftables_pernet *nft_net = nft_pernet(net);
9536 struct nft_table *table;
9538 list_for_each_entry(table, &nft_net->tables, list) {
9539 if (nft_table_has_owner(table))
9542 __nft_release_hook(net, table);
9546 static void __nft_release_table(struct net *net, struct nft_table *table)
9548 struct nft_flowtable *flowtable, *nf;
9549 struct nft_chain *chain, *nc;
9550 struct nft_object *obj, *ne;
9551 struct nft_rule *rule, *nr;
9552 struct nft_set *set, *ns;
9553 struct nft_ctx ctx = {
9555 .family = NFPROTO_NETDEV,
9558 ctx.family = table->family;
9560 list_for_each_entry(chain, &table->chains, list) {
9562 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
9563 list_del(&rule->list);
9565 nf_tables_rule_release(&ctx, rule);
9568 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
9569 list_del(&flowtable->list);
9571 nf_tables_flowtable_destroy(flowtable);
9573 list_for_each_entry_safe(set, ns, &table->sets, list) {
9574 list_del(&set->list);
9576 nft_set_destroy(&ctx, set);
9578 list_for_each_entry_safe(obj, ne, &table->objects, list) {
9581 nft_obj_destroy(&ctx, obj);
9583 list_for_each_entry_safe(chain, nc, &table->chains, list) {
9585 nft_chain_del(chain);
9587 nf_tables_chain_destroy(&ctx);
9589 list_del(&table->list);
9590 nf_tables_table_destroy(&ctx);
9593 static void __nft_release_tables(struct net *net)
9595 struct nftables_pernet *nft_net = nft_pernet(net);
9596 struct nft_table *table, *nt;
9598 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
9599 if (nft_table_has_owner(table))
9602 __nft_release_table(net, table);
9606 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
9609 struct nftables_pernet *nft_net;
9610 struct netlink_notify *n = ptr;
9611 struct nft_table *table, *nt;
9612 struct net *net = n->net;
9613 bool release = false;
9615 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
9618 nft_net = nft_pernet(net);
9619 mutex_lock(&nft_net->commit_mutex);
9620 list_for_each_entry(table, &nft_net->tables, list) {
9621 if (nft_table_has_owner(table) &&
9622 n->portid == table->nlpid) {
9623 __nft_release_hook(net, table);
9629 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
9630 if (nft_table_has_owner(table) &&
9631 n->portid == table->nlpid)
9632 __nft_release_table(net, table);
9635 mutex_unlock(&nft_net->commit_mutex);
9640 static struct notifier_block nft_nl_notifier = {
9641 .notifier_call = nft_rcv_nl_event,
9644 static int __net_init nf_tables_init_net(struct net *net)
9646 struct nftables_pernet *nft_net = nft_pernet(net);
9648 INIT_LIST_HEAD(&nft_net->tables);
9649 INIT_LIST_HEAD(&nft_net->commit_list);
9650 INIT_LIST_HEAD(&nft_net->module_list);
9651 INIT_LIST_HEAD(&nft_net->notify_list);
9652 mutex_init(&nft_net->commit_mutex);
9653 nft_net->base_seq = 1;
9654 nft_net->validate_state = NFT_VALIDATE_SKIP;
9659 static void __net_exit nf_tables_pre_exit_net(struct net *net)
9661 __nft_release_hooks(net);
9664 static void __net_exit nf_tables_exit_net(struct net *net)
9666 struct nftables_pernet *nft_net = nft_pernet(net);
9668 mutex_lock(&nft_net->commit_mutex);
9669 if (!list_empty(&nft_net->commit_list))
9670 __nf_tables_abort(net, NFNL_ABORT_NONE);
9671 __nft_release_tables(net);
9672 mutex_unlock(&nft_net->commit_mutex);
9673 WARN_ON_ONCE(!list_empty(&nft_net->tables));
9674 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
9675 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9678 static struct pernet_operations nf_tables_net_ops = {
9679 .init = nf_tables_init_net,
9680 .pre_exit = nf_tables_pre_exit_net,
9681 .exit = nf_tables_exit_net,
9682 .id = &nf_tables_net_id,
9683 .size = sizeof(struct nftables_pernet),
9686 static int __init nf_tables_module_init(void)
9690 err = register_pernet_subsys(&nf_tables_net_ops);
9694 err = nft_chain_filter_init();
9696 goto err_chain_filter;
9698 err = nf_tables_core_module_init();
9700 goto err_core_module;
9702 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
9704 goto err_netdev_notifier;
9706 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
9708 goto err_rht_objname;
9710 err = nft_offload_init();
9714 err = netlink_register_notifier(&nft_nl_notifier);
9716 goto err_netlink_notifier;
9719 err = nfnetlink_subsys_register(&nf_tables_subsys);
9721 goto err_nfnl_subsys;
9723 nft_chain_route_init();
9728 netlink_unregister_notifier(&nft_nl_notifier);
9729 err_netlink_notifier:
9732 rhltable_destroy(&nft_objname_ht);
9734 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9735 err_netdev_notifier:
9736 nf_tables_core_module_exit();
9738 nft_chain_filter_fini();
9740 unregister_pernet_subsys(&nf_tables_net_ops);
9744 static void __exit nf_tables_module_exit(void)
9746 nfnetlink_subsys_unregister(&nf_tables_subsys);
9747 netlink_unregister_notifier(&nft_nl_notifier);
9749 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9750 nft_chain_filter_fini();
9751 nft_chain_route_fini();
9752 unregister_pernet_subsys(&nf_tables_net_ops);
9753 cancel_work_sync(&trans_destroy_work);
9755 rhltable_destroy(&nft_objname_ht);
9756 nf_tables_core_module_exit();
9759 module_init(nf_tables_module_init);
9760 module_exit(nf_tables_module_exit);
9762 MODULE_LICENSE("GPL");
9763 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
9764 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);