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 INIT_LIST_HEAD(&trans->list);
157 trans->msg_type = msg_type;
163 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
164 int msg_type, u32 size)
166 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
169 static void nft_trans_destroy(struct nft_trans *trans)
171 list_del(&trans->list);
175 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
177 struct nftables_pernet *nft_net;
178 struct net *net = ctx->net;
179 struct nft_trans *trans;
181 if (!nft_set_is_anonymous(set))
184 nft_net = nft_pernet(net);
185 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
186 switch (trans->msg_type) {
188 if (nft_trans_set(trans) == set)
189 nft_trans_set_bound(trans) = true;
191 case NFT_MSG_NEWSETELEM:
192 if (nft_trans_elem_set(trans) == set)
193 nft_trans_elem_set_bound(trans) = true;
199 static int nft_netdev_register_hooks(struct net *net,
200 struct list_head *hook_list)
202 struct nft_hook *hook;
206 list_for_each_entry(hook, hook_list, list) {
207 err = nf_register_net_hook(net, &hook->ops);
216 list_for_each_entry(hook, hook_list, list) {
220 nf_unregister_net_hook(net, &hook->ops);
225 static void nft_netdev_unregister_hooks(struct net *net,
226 struct list_head *hook_list,
229 struct nft_hook *hook, *next;
231 list_for_each_entry_safe(hook, next, hook_list, list) {
232 nf_unregister_net_hook(net, &hook->ops);
233 if (release_netdev) {
234 list_del(&hook->list);
235 kfree_rcu(hook, rcu);
240 static int nf_tables_register_hook(struct net *net,
241 const struct nft_table *table,
242 struct nft_chain *chain)
244 struct nft_base_chain *basechain;
245 const struct nf_hook_ops *ops;
247 if (table->flags & NFT_TABLE_F_DORMANT ||
248 !nft_is_base_chain(chain))
251 basechain = nft_base_chain(chain);
252 ops = &basechain->ops;
254 if (basechain->type->ops_register)
255 return basechain->type->ops_register(net, ops);
257 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
258 return nft_netdev_register_hooks(net, &basechain->hook_list);
260 return nf_register_net_hook(net, &basechain->ops);
263 static void __nf_tables_unregister_hook(struct net *net,
264 const struct nft_table *table,
265 struct nft_chain *chain,
268 struct nft_base_chain *basechain;
269 const struct nf_hook_ops *ops;
271 if (table->flags & NFT_TABLE_F_DORMANT ||
272 !nft_is_base_chain(chain))
274 basechain = nft_base_chain(chain);
275 ops = &basechain->ops;
277 if (basechain->type->ops_unregister)
278 return basechain->type->ops_unregister(net, ops);
280 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
281 nft_netdev_unregister_hooks(net, &basechain->hook_list,
284 nf_unregister_net_hook(net, &basechain->ops);
287 static void nf_tables_unregister_hook(struct net *net,
288 const struct nft_table *table,
289 struct nft_chain *chain)
291 return __nf_tables_unregister_hook(net, table, chain, false);
294 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
296 struct nftables_pernet *nft_net = nft_pernet(net);
298 list_add_tail(&trans->list, &nft_net->commit_list);
301 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
303 struct nft_trans *trans;
305 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
309 if (msg_type == NFT_MSG_NEWTABLE)
310 nft_activate_next(ctx->net, ctx->table);
312 nft_trans_commit_list_add_tail(ctx->net, trans);
316 static int nft_deltable(struct nft_ctx *ctx)
320 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
324 nft_deactivate_next(ctx->net, ctx->table);
328 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
330 struct nft_trans *trans;
332 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
334 return ERR_PTR(-ENOMEM);
336 if (msg_type == NFT_MSG_NEWCHAIN) {
337 nft_activate_next(ctx->net, ctx->chain);
339 if (ctx->nla[NFTA_CHAIN_ID]) {
340 nft_trans_chain_id(trans) =
341 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
345 nft_trans_commit_list_add_tail(ctx->net, trans);
349 static int nft_delchain(struct nft_ctx *ctx)
351 struct nft_trans *trans;
353 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
355 return PTR_ERR(trans);
358 nft_deactivate_next(ctx->net, ctx->chain);
363 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
364 struct nft_rule *rule)
366 struct nft_expr *expr;
368 expr = nft_expr_first(rule);
369 while (nft_expr_more(rule, expr)) {
370 if (expr->ops->activate)
371 expr->ops->activate(ctx, expr);
373 expr = nft_expr_next(expr);
377 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
378 struct nft_rule *rule,
379 enum nft_trans_phase phase)
381 struct nft_expr *expr;
383 expr = nft_expr_first(rule);
384 while (nft_expr_more(rule, expr)) {
385 if (expr->ops->deactivate)
386 expr->ops->deactivate(ctx, expr, phase);
388 expr = nft_expr_next(expr);
393 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
395 /* You cannot delete the same rule twice */
396 if (nft_is_active_next(ctx->net, rule)) {
397 nft_deactivate_next(ctx->net, rule);
404 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
405 struct nft_rule *rule)
407 struct nft_trans *trans;
409 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
413 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
414 nft_trans_rule_id(trans) =
415 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
417 nft_trans_rule(trans) = rule;
418 nft_trans_commit_list_add_tail(ctx->net, trans);
423 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
425 struct nft_flow_rule *flow;
426 struct nft_trans *trans;
429 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
433 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
434 flow = nft_flow_rule_create(ctx->net, rule);
436 nft_trans_destroy(trans);
437 return PTR_ERR(flow);
440 nft_trans_flow_rule(trans) = flow;
443 err = nf_tables_delrule_deactivate(ctx, rule);
445 nft_trans_destroy(trans);
448 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
453 static int nft_delrule_by_chain(struct nft_ctx *ctx)
455 struct nft_rule *rule;
458 list_for_each_entry(rule, &ctx->chain->rules, list) {
459 if (!nft_is_active_next(ctx->net, rule))
462 err = nft_delrule(ctx, rule);
469 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
472 struct nft_trans *trans;
474 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
478 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
479 nft_trans_set_id(trans) =
480 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
481 nft_activate_next(ctx->net, set);
483 nft_trans_set(trans) = set;
484 nft_trans_commit_list_add_tail(ctx->net, trans);
489 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
493 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
497 nft_deactivate_next(ctx->net, set);
503 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
504 struct nft_object *obj)
506 struct nft_trans *trans;
508 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
512 if (msg_type == NFT_MSG_NEWOBJ)
513 nft_activate_next(ctx->net, obj);
515 nft_trans_obj(trans) = obj;
516 nft_trans_commit_list_add_tail(ctx->net, trans);
521 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
525 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
529 nft_deactivate_next(ctx->net, obj);
535 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
536 struct nft_flowtable *flowtable)
538 struct nft_trans *trans;
540 trans = nft_trans_alloc(ctx, msg_type,
541 sizeof(struct nft_trans_flowtable));
545 if (msg_type == NFT_MSG_NEWFLOWTABLE)
546 nft_activate_next(ctx->net, flowtable);
548 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
549 nft_trans_flowtable(trans) = flowtable;
550 nft_trans_commit_list_add_tail(ctx->net, trans);
555 static int nft_delflowtable(struct nft_ctx *ctx,
556 struct nft_flowtable *flowtable)
560 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
564 nft_deactivate_next(ctx->net, flowtable);
570 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
574 for (i = track->regs[dreg].num_reg; i > 0; i--)
575 __nft_reg_track_cancel(track, dreg - i);
578 static void __nft_reg_track_update(struct nft_regs_track *track,
579 const struct nft_expr *expr,
582 track->regs[dreg].selector = expr;
583 track->regs[dreg].bitwise = NULL;
584 track->regs[dreg].num_reg = num_reg;
587 void nft_reg_track_update(struct nft_regs_track *track,
588 const struct nft_expr *expr, u8 dreg, u8 len)
590 unsigned int regcount;
593 __nft_reg_track_clobber(track, dreg);
595 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
596 for (i = 0; i < regcount; i++, dreg++)
597 __nft_reg_track_update(track, expr, dreg, i);
599 EXPORT_SYMBOL_GPL(nft_reg_track_update);
601 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
603 unsigned int regcount;
606 __nft_reg_track_clobber(track, dreg);
608 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
609 for (i = 0; i < regcount; i++, dreg++)
610 __nft_reg_track_cancel(track, dreg);
612 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
614 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
616 track->regs[dreg].selector = NULL;
617 track->regs[dreg].bitwise = NULL;
618 track->regs[dreg].num_reg = 0;
620 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
626 static struct nft_table *nft_table_lookup(const struct net *net,
627 const struct nlattr *nla,
628 u8 family, u8 genmask, u32 nlpid)
630 struct nftables_pernet *nft_net;
631 struct nft_table *table;
634 return ERR_PTR(-EINVAL);
636 nft_net = nft_pernet(net);
637 list_for_each_entry_rcu(table, &nft_net->tables, list,
638 lockdep_is_held(&nft_net->commit_mutex)) {
639 if (!nla_strcmp(nla, table->name) &&
640 table->family == family &&
641 nft_active_genmask(table, genmask)) {
642 if (nft_table_has_owner(table) &&
643 nlpid && table->nlpid != nlpid)
644 return ERR_PTR(-EPERM);
650 return ERR_PTR(-ENOENT);
653 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
654 const struct nlattr *nla,
655 u8 genmask, u32 nlpid)
657 struct nftables_pernet *nft_net;
658 struct nft_table *table;
660 nft_net = nft_pernet(net);
661 list_for_each_entry(table, &nft_net->tables, list) {
662 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
663 nft_active_genmask(table, genmask)) {
664 if (nft_table_has_owner(table) &&
665 nlpid && table->nlpid != nlpid)
666 return ERR_PTR(-EPERM);
672 return ERR_PTR(-ENOENT);
675 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
677 return ++table->hgenerator;
680 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
682 static const struct nft_chain_type *
683 __nft_chain_type_get(u8 family, enum nft_chain_types type)
685 if (family >= NFPROTO_NUMPROTO ||
686 type >= NFT_CHAIN_T_MAX)
689 return chain_type[family][type];
692 static const struct nft_chain_type *
693 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
695 const struct nft_chain_type *type;
698 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
699 type = __nft_chain_type_get(family, i);
702 if (!nla_strcmp(nla, type->name))
708 struct nft_module_request {
709 struct list_head list;
710 char module[MODULE_NAME_LEN];
714 #ifdef CONFIG_MODULES
715 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
718 char module_name[MODULE_NAME_LEN];
719 struct nftables_pernet *nft_net;
720 struct nft_module_request *req;
725 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
727 if (ret >= MODULE_NAME_LEN)
730 nft_net = nft_pernet(net);
731 list_for_each_entry(req, &nft_net->module_list, list) {
732 if (!strcmp(req->module, module_name)) {
736 /* A request to load this module already exists. */
741 req = kmalloc(sizeof(*req), GFP_KERNEL);
746 strlcpy(req->module, module_name, MODULE_NAME_LEN);
747 list_add_tail(&req->list, &nft_net->module_list);
751 EXPORT_SYMBOL_GPL(nft_request_module);
754 static void lockdep_nfnl_nft_mutex_not_held(void)
756 #ifdef CONFIG_PROVE_LOCKING
758 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
762 static const struct nft_chain_type *
763 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
764 u8 family, bool autoload)
766 const struct nft_chain_type *type;
768 type = __nf_tables_chain_type_lookup(nla, family);
772 lockdep_nfnl_nft_mutex_not_held();
773 #ifdef CONFIG_MODULES
775 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
777 (const char *)nla_data(nla)) == -EAGAIN)
778 return ERR_PTR(-EAGAIN);
781 return ERR_PTR(-ENOENT);
784 static __be16 nft_base_seq(const struct net *net)
786 struct nftables_pernet *nft_net = nft_pernet(net);
788 return htons(nft_net->base_seq & 0xffff);
791 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
792 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
793 .len = NFT_TABLE_MAXNAMELEN - 1 },
794 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
795 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
796 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
797 .len = NFT_USERDATA_MAXLEN }
800 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
801 u32 portid, u32 seq, int event, u32 flags,
802 int family, const struct nft_table *table)
804 struct nlmsghdr *nlh;
806 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
807 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
808 NFNETLINK_V0, nft_base_seq(net));
810 goto nla_put_failure;
812 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
813 nla_put_be32(skb, NFTA_TABLE_FLAGS,
814 htonl(table->flags & NFT_TABLE_F_MASK)) ||
815 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
816 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
818 goto nla_put_failure;
819 if (nft_table_has_owner(table) &&
820 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
821 goto nla_put_failure;
824 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
825 goto nla_put_failure;
832 nlmsg_trim(skb, nlh);
836 struct nftnl_skb_parms {
839 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
841 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
842 struct list_head *notify_list)
844 NFT_CB(skb).report = report;
845 list_add_tail(&skb->list, notify_list);
848 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
850 struct nftables_pernet *nft_net;
856 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
859 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
863 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
864 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
866 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
867 event, flags, ctx->family, ctx->table);
873 nft_net = nft_pernet(ctx->net);
874 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
877 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
880 static int nf_tables_dump_tables(struct sk_buff *skb,
881 struct netlink_callback *cb)
883 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
884 struct nftables_pernet *nft_net;
885 const struct nft_table *table;
886 unsigned int idx = 0, s_idx = cb->args[0];
887 struct net *net = sock_net(skb->sk);
888 int family = nfmsg->nfgen_family;
891 nft_net = nft_pernet(net);
892 cb->seq = READ_ONCE(nft_net->base_seq);
894 list_for_each_entry_rcu(table, &nft_net->tables, list) {
895 if (family != NFPROTO_UNSPEC && family != table->family)
901 memset(&cb->args[1], 0,
902 sizeof(cb->args) - sizeof(cb->args[0]));
903 if (!nft_is_active(net, table))
905 if (nf_tables_fill_table_info(skb, net,
906 NETLINK_CB(cb->skb).portid,
908 NFT_MSG_NEWTABLE, NLM_F_MULTI,
909 table->family, table) < 0)
912 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
922 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
923 const struct nlmsghdr *nlh,
924 struct netlink_dump_control *c)
928 if (!try_module_get(THIS_MODULE))
932 err = netlink_dump_start(nlsk, skb, nlh, c);
934 module_put(THIS_MODULE);
939 /* called with rcu_read_lock held */
940 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
941 const struct nlattr * const nla[])
943 struct netlink_ext_ack *extack = info->extack;
944 u8 genmask = nft_genmask_cur(info->net);
945 u8 family = info->nfmsg->nfgen_family;
946 const struct nft_table *table;
947 struct net *net = info->net;
948 struct sk_buff *skb2;
951 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
952 struct netlink_dump_control c = {
953 .dump = nf_tables_dump_tables,
954 .module = THIS_MODULE,
957 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
960 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
962 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
963 return PTR_ERR(table);
966 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
970 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
971 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
974 goto err_fill_table_info;
976 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
983 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
985 struct nft_chain *chain;
988 list_for_each_entry(chain, &table->chains, list) {
989 if (!nft_is_active_next(net, chain))
991 if (!nft_is_base_chain(chain))
994 if (cnt && i++ == cnt)
997 nf_tables_unregister_hook(net, table, chain);
1001 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1003 struct nft_chain *chain;
1006 list_for_each_entry(chain, &table->chains, list) {
1007 if (!nft_is_active_next(net, chain))
1009 if (!nft_is_base_chain(chain))
1012 err = nf_tables_register_hook(net, table, chain);
1014 goto err_register_hooks;
1022 nft_table_disable(net, table, i);
1026 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1028 table->flags &= ~NFT_TABLE_F_DORMANT;
1029 nft_table_disable(net, table, 0);
1030 table->flags |= NFT_TABLE_F_DORMANT;
1033 #define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
1034 #define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
1035 #define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
1036 #define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
1037 __NFT_TABLE_F_WAS_AWAKEN)
1039 static int nf_tables_updtable(struct nft_ctx *ctx)
1041 struct nft_trans *trans;
1045 if (!ctx->nla[NFTA_TABLE_FLAGS])
1048 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1049 if (flags & ~NFT_TABLE_F_MASK)
1052 if (flags == ctx->table->flags)
1055 if ((nft_table_has_owner(ctx->table) &&
1056 !(flags & NFT_TABLE_F_OWNER)) ||
1057 (!nft_table_has_owner(ctx->table) &&
1058 flags & NFT_TABLE_F_OWNER))
1061 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1062 sizeof(struct nft_trans_table));
1066 if ((flags & NFT_TABLE_F_DORMANT) &&
1067 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1068 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1069 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1070 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1071 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1072 ctx->table->flags & NFT_TABLE_F_DORMANT) {
1073 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1074 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1075 ret = nf_tables_table_enable(ctx->net, ctx->table);
1077 goto err_register_hooks;
1079 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1083 nft_trans_table_update(trans) = true;
1084 nft_trans_commit_list_add_tail(ctx->net, trans);
1089 nft_trans_destroy(trans);
1093 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1095 const char *name = data;
1097 return jhash(name, strlen(name), seed);
1100 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1102 const struct nft_chain *chain = data;
1104 return nft_chain_hash(chain->name, 0, seed);
1107 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1110 const struct nft_chain *chain = ptr;
1111 const char *name = arg->key;
1113 return strcmp(chain->name, name);
1116 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1118 const struct nft_object_hash_key *k = data;
1120 seed ^= hash_ptr(k->table, 32);
1122 return jhash(k->name, strlen(k->name), seed);
1125 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1127 const struct nft_object *obj = data;
1129 return nft_objname_hash(&obj->key, 0, seed);
1132 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1135 const struct nft_object_hash_key *k = arg->key;
1136 const struct nft_object *obj = ptr;
1138 if (obj->key.table != k->table)
1141 return strcmp(obj->key.name, k->name);
1144 static bool nft_supported_family(u8 family)
1147 #ifdef CONFIG_NF_TABLES_INET
1148 || family == NFPROTO_INET
1150 #ifdef CONFIG_NF_TABLES_IPV4
1151 || family == NFPROTO_IPV4
1153 #ifdef CONFIG_NF_TABLES_ARP
1154 || family == NFPROTO_ARP
1156 #ifdef CONFIG_NF_TABLES_NETDEV
1157 || family == NFPROTO_NETDEV
1159 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1160 || family == NFPROTO_BRIDGE
1162 #ifdef CONFIG_NF_TABLES_IPV6
1163 || family == NFPROTO_IPV6
1168 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1169 const struct nlattr * const nla[])
1171 struct nftables_pernet *nft_net = nft_pernet(info->net);
1172 struct netlink_ext_ack *extack = info->extack;
1173 u8 genmask = nft_genmask_next(info->net);
1174 u8 family = info->nfmsg->nfgen_family;
1175 struct net *net = info->net;
1176 const struct nlattr *attr;
1177 struct nft_table *table;
1182 if (!nft_supported_family(family))
1185 lockdep_assert_held(&nft_net->commit_mutex);
1186 attr = nla[NFTA_TABLE_NAME];
1187 table = nft_table_lookup(net, attr, family, genmask,
1188 NETLINK_CB(skb).portid);
1189 if (IS_ERR(table)) {
1190 if (PTR_ERR(table) != -ENOENT)
1191 return PTR_ERR(table);
1193 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1194 NL_SET_BAD_ATTR(extack, attr);
1197 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1200 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1202 return nf_tables_updtable(&ctx);
1205 if (nla[NFTA_TABLE_FLAGS]) {
1206 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1207 if (flags & ~NFT_TABLE_F_MASK)
1212 table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1216 table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1217 if (table->name == NULL)
1220 if (nla[NFTA_TABLE_USERDATA]) {
1221 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1222 if (table->udata == NULL)
1223 goto err_table_udata;
1225 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1228 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1232 INIT_LIST_HEAD(&table->chains);
1233 INIT_LIST_HEAD(&table->sets);
1234 INIT_LIST_HEAD(&table->objects);
1235 INIT_LIST_HEAD(&table->flowtables);
1236 table->family = family;
1237 table->flags = flags;
1238 table->handle = ++table_handle;
1239 if (table->flags & NFT_TABLE_F_OWNER)
1240 table->nlpid = NETLINK_CB(skb).portid;
1242 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1243 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1247 list_add_tail_rcu(&table->list, &nft_net->tables);
1250 rhltable_destroy(&table->chains_ht);
1252 kfree(table->udata);
1261 static int nft_flush_table(struct nft_ctx *ctx)
1263 struct nft_flowtable *flowtable, *nft;
1264 struct nft_chain *chain, *nc;
1265 struct nft_object *obj, *ne;
1266 struct nft_set *set, *ns;
1269 list_for_each_entry(chain, &ctx->table->chains, list) {
1270 if (!nft_is_active_next(ctx->net, chain))
1273 if (nft_chain_is_bound(chain))
1278 err = nft_delrule_by_chain(ctx);
1283 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1284 if (!nft_is_active_next(ctx->net, set))
1287 if (nft_set_is_anonymous(set) &&
1288 !list_empty(&set->bindings))
1291 err = nft_delset(ctx, set);
1296 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1297 if (!nft_is_active_next(ctx->net, flowtable))
1300 err = nft_delflowtable(ctx, flowtable);
1305 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1306 if (!nft_is_active_next(ctx->net, obj))
1309 err = nft_delobj(ctx, obj);
1314 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1315 if (!nft_is_active_next(ctx->net, chain))
1318 if (nft_chain_is_bound(chain))
1323 err = nft_delchain(ctx);
1328 err = nft_deltable(ctx);
1333 static int nft_flush(struct nft_ctx *ctx, int family)
1335 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1336 const struct nlattr * const *nla = ctx->nla;
1337 struct nft_table *table, *nt;
1340 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1341 if (family != AF_UNSPEC && table->family != family)
1344 ctx->family = table->family;
1346 if (!nft_is_active_next(ctx->net, table))
1349 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1352 if (nla[NFTA_TABLE_NAME] &&
1353 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1358 err = nft_flush_table(ctx);
1366 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1367 const struct nlattr * const nla[])
1369 struct netlink_ext_ack *extack = info->extack;
1370 u8 genmask = nft_genmask_next(info->net);
1371 u8 family = info->nfmsg->nfgen_family;
1372 struct net *net = info->net;
1373 const struct nlattr *attr;
1374 struct nft_table *table;
1377 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1378 if (family == AF_UNSPEC ||
1379 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1380 return nft_flush(&ctx, family);
1382 if (nla[NFTA_TABLE_HANDLE]) {
1383 attr = nla[NFTA_TABLE_HANDLE];
1384 table = nft_table_lookup_byhandle(net, attr, genmask,
1385 NETLINK_CB(skb).portid);
1387 attr = nla[NFTA_TABLE_NAME];
1388 table = nft_table_lookup(net, attr, family, genmask,
1389 NETLINK_CB(skb).portid);
1392 if (IS_ERR(table)) {
1393 NL_SET_BAD_ATTR(extack, attr);
1394 return PTR_ERR(table);
1397 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1401 ctx.family = family;
1404 return nft_flush_table(&ctx);
1407 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1409 if (WARN_ON(ctx->table->use > 0))
1412 rhltable_destroy(&ctx->table->chains_ht);
1413 kfree(ctx->table->name);
1414 kfree(ctx->table->udata);
1418 void nft_register_chain_type(const struct nft_chain_type *ctype)
1420 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1421 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1422 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1425 chain_type[ctype->family][ctype->type] = ctype;
1426 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1428 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1430 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1432 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1433 chain_type[ctype->family][ctype->type] = NULL;
1434 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1436 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1442 static struct nft_chain *
1443 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1445 struct nft_chain *chain;
1447 list_for_each_entry(chain, &table->chains, list) {
1448 if (chain->handle == handle &&
1449 nft_active_genmask(chain, genmask))
1453 return ERR_PTR(-ENOENT);
1456 static bool lockdep_commit_lock_is_held(const struct net *net)
1458 #ifdef CONFIG_PROVE_LOCKING
1459 struct nftables_pernet *nft_net = nft_pernet(net);
1461 return lockdep_is_held(&nft_net->commit_mutex);
1467 static struct nft_chain *nft_chain_lookup(struct net *net,
1468 struct nft_table *table,
1469 const struct nlattr *nla, u8 genmask)
1471 char search[NFT_CHAIN_MAXNAMELEN + 1];
1472 struct rhlist_head *tmp, *list;
1473 struct nft_chain *chain;
1476 return ERR_PTR(-EINVAL);
1478 nla_strscpy(search, nla, sizeof(search));
1480 WARN_ON(!rcu_read_lock_held() &&
1481 !lockdep_commit_lock_is_held(net));
1483 chain = ERR_PTR(-ENOENT);
1485 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1489 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1490 if (nft_active_genmask(chain, genmask))
1493 chain = ERR_PTR(-ENOENT);
1499 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1500 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1501 .len = NFT_TABLE_MAXNAMELEN - 1 },
1502 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1503 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1504 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1505 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1506 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1507 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1508 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1509 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1510 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1511 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1512 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1513 .len = NFT_USERDATA_MAXLEN },
1516 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1517 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1518 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1519 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1520 .len = IFNAMSIZ - 1 },
1523 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1525 struct nft_stats *cpu_stats, total;
1526 struct nlattr *nest;
1534 memset(&total, 0, sizeof(total));
1535 for_each_possible_cpu(cpu) {
1536 cpu_stats = per_cpu_ptr(stats, cpu);
1538 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1539 pkts = cpu_stats->pkts;
1540 bytes = cpu_stats->bytes;
1541 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1543 total.bytes += bytes;
1545 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1547 goto nla_put_failure;
1549 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1550 NFTA_COUNTER_PAD) ||
1551 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1553 goto nla_put_failure;
1555 nla_nest_end(skb, nest);
1562 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1563 const struct nft_base_chain *basechain)
1565 const struct nf_hook_ops *ops = &basechain->ops;
1566 struct nft_hook *hook, *first = NULL;
1567 struct nlattr *nest, *nest_devs;
1570 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1572 goto nla_put_failure;
1573 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1574 goto nla_put_failure;
1575 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1576 goto nla_put_failure;
1578 if (nft_base_chain_netdev(family, ops->hooknum)) {
1579 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1580 list_for_each_entry(hook, &basechain->hook_list, list) {
1584 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1585 hook->ops.dev->name))
1586 goto nla_put_failure;
1589 nla_nest_end(skb, nest_devs);
1592 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1593 goto nla_put_failure;
1595 nla_nest_end(skb, nest);
1602 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1603 u32 portid, u32 seq, int event, u32 flags,
1604 int family, const struct nft_table *table,
1605 const struct nft_chain *chain)
1607 struct nlmsghdr *nlh;
1609 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1610 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1611 NFNETLINK_V0, nft_base_seq(net));
1613 goto nla_put_failure;
1615 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1616 goto nla_put_failure;
1617 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1619 goto nla_put_failure;
1620 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1621 goto nla_put_failure;
1623 if (nft_is_base_chain(chain)) {
1624 const struct nft_base_chain *basechain = nft_base_chain(chain);
1625 struct nft_stats __percpu *stats;
1627 if (nft_dump_basechain_hook(skb, family, basechain))
1628 goto nla_put_failure;
1630 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1631 htonl(basechain->policy)))
1632 goto nla_put_failure;
1634 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1635 goto nla_put_failure;
1637 stats = rcu_dereference_check(basechain->stats,
1638 lockdep_commit_lock_is_held(net));
1639 if (nft_dump_stats(skb, stats))
1640 goto nla_put_failure;
1644 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1645 goto nla_put_failure;
1647 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1648 goto nla_put_failure;
1651 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1652 goto nla_put_failure;
1654 nlmsg_end(skb, nlh);
1658 nlmsg_trim(skb, nlh);
1662 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1664 struct nftables_pernet *nft_net;
1665 struct sk_buff *skb;
1670 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1673 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1677 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1678 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1680 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1681 event, flags, ctx->family, ctx->table,
1688 nft_net = nft_pernet(ctx->net);
1689 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1692 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1695 static int nf_tables_dump_chains(struct sk_buff *skb,
1696 struct netlink_callback *cb)
1698 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1699 unsigned int idx = 0, s_idx = cb->args[0];
1700 struct net *net = sock_net(skb->sk);
1701 int family = nfmsg->nfgen_family;
1702 struct nftables_pernet *nft_net;
1703 const struct nft_table *table;
1704 const struct nft_chain *chain;
1707 nft_net = nft_pernet(net);
1708 cb->seq = READ_ONCE(nft_net->base_seq);
1710 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1711 if (family != NFPROTO_UNSPEC && family != table->family)
1714 list_for_each_entry_rcu(chain, &table->chains, list) {
1718 memset(&cb->args[1], 0,
1719 sizeof(cb->args) - sizeof(cb->args[0]));
1720 if (!nft_is_active(net, chain))
1722 if (nf_tables_fill_chain_info(skb, net,
1723 NETLINK_CB(cb->skb).portid,
1727 table->family, table,
1731 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1742 /* called with rcu_read_lock held */
1743 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1744 const struct nlattr * const nla[])
1746 struct netlink_ext_ack *extack = info->extack;
1747 u8 genmask = nft_genmask_cur(info->net);
1748 u8 family = info->nfmsg->nfgen_family;
1749 const struct nft_chain *chain;
1750 struct net *net = info->net;
1751 struct nft_table *table;
1752 struct sk_buff *skb2;
1755 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1756 struct netlink_dump_control c = {
1757 .dump = nf_tables_dump_chains,
1758 .module = THIS_MODULE,
1761 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1764 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1765 if (IS_ERR(table)) {
1766 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1767 return PTR_ERR(table);
1770 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1771 if (IS_ERR(chain)) {
1772 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1773 return PTR_ERR(chain);
1776 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1780 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1781 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1782 0, family, table, chain);
1784 goto err_fill_chain_info;
1786 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1788 err_fill_chain_info:
1793 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1794 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1795 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1798 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1800 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1801 struct nft_stats __percpu *newstats;
1802 struct nft_stats *stats;
1805 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1806 nft_counter_policy, NULL);
1808 return ERR_PTR(err);
1810 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1811 return ERR_PTR(-EINVAL);
1813 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1814 if (newstats == NULL)
1815 return ERR_PTR(-ENOMEM);
1817 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1818 * are not exposed to userspace.
1821 stats = this_cpu_ptr(newstats);
1822 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1823 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1829 static void nft_chain_stats_replace(struct nft_trans *trans)
1831 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1833 if (!nft_trans_chain_stats(trans))
1836 nft_trans_chain_stats(trans) =
1837 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1838 lockdep_commit_lock_is_held(trans->ctx.net));
1840 if (!nft_trans_chain_stats(trans))
1841 static_branch_inc(&nft_counters_enabled);
1844 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1846 struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
1847 struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
1853 /* should be NULL either via abort or via successful commit */
1854 WARN_ON_ONCE(chain->blob_next);
1855 kvfree(chain->blob_next);
1858 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1860 struct nft_chain *chain = ctx->chain;
1861 struct nft_hook *hook, *next;
1863 if (WARN_ON(chain->use > 0))
1866 /* no concurrent access possible anymore */
1867 nf_tables_chain_free_chain_rules(chain);
1869 if (nft_is_base_chain(chain)) {
1870 struct nft_base_chain *basechain = nft_base_chain(chain);
1872 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1873 list_for_each_entry_safe(hook, next,
1874 &basechain->hook_list, list) {
1875 list_del_rcu(&hook->list);
1876 kfree_rcu(hook, rcu);
1879 module_put(basechain->type->owner);
1880 if (rcu_access_pointer(basechain->stats)) {
1881 static_branch_dec(&nft_counters_enabled);
1882 free_percpu(rcu_dereference_raw(basechain->stats));
1885 kfree(chain->udata);
1889 kfree(chain->udata);
1894 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1895 const struct nlattr *attr)
1897 struct net_device *dev;
1898 char ifname[IFNAMSIZ];
1899 struct nft_hook *hook;
1902 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
1905 goto err_hook_alloc;
1908 nla_strscpy(ifname, attr, IFNAMSIZ);
1909 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1910 * indirectly serializing all the other holders of the commit_mutex with
1913 dev = __dev_get_by_name(net, ifname);
1918 hook->ops.dev = dev;
1925 return ERR_PTR(err);
1928 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1929 const struct nft_hook *this)
1931 struct nft_hook *hook;
1933 list_for_each_entry(hook, hook_list, list) {
1934 if (this->ops.dev == hook->ops.dev)
1941 static int nf_tables_parse_netdev_hooks(struct net *net,
1942 const struct nlattr *attr,
1943 struct list_head *hook_list)
1945 struct nft_hook *hook, *next;
1946 const struct nlattr *tmp;
1947 int rem, n = 0, err;
1949 nla_for_each_nested(tmp, attr, rem) {
1950 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1955 hook = nft_netdev_hook_alloc(net, tmp);
1957 err = PTR_ERR(hook);
1960 if (nft_hook_list_find(hook_list, hook)) {
1965 list_add_tail(&hook->list, hook_list);
1968 if (n == NFT_NETDEVICE_MAX) {
1977 list_for_each_entry_safe(hook, next, hook_list, list) {
1978 list_del(&hook->list);
1984 struct nft_chain_hook {
1987 const struct nft_chain_type *type;
1988 struct list_head list;
1991 static int nft_chain_parse_netdev(struct net *net,
1992 struct nlattr *tb[],
1993 struct list_head *hook_list)
1995 struct nft_hook *hook;
1998 if (tb[NFTA_HOOK_DEV]) {
1999 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2001 return PTR_ERR(hook);
2003 list_add_tail(&hook->list, hook_list);
2004 } else if (tb[NFTA_HOOK_DEVS]) {
2005 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2010 if (list_empty(hook_list))
2019 static int nft_chain_parse_hook(struct net *net,
2020 const struct nlattr * const nla[],
2021 struct nft_chain_hook *hook, u8 family,
2022 struct netlink_ext_ack *extack, bool autoload)
2024 struct nftables_pernet *nft_net = nft_pernet(net);
2025 struct nlattr *ha[NFTA_HOOK_MAX + 1];
2026 const struct nft_chain_type *type;
2029 lockdep_assert_held(&nft_net->commit_mutex);
2030 lockdep_nfnl_nft_mutex_not_held();
2032 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2033 nla[NFTA_CHAIN_HOOK],
2034 nft_hook_policy, NULL);
2038 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
2039 ha[NFTA_HOOK_PRIORITY] == NULL)
2042 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2043 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2045 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2049 if (nla[NFTA_CHAIN_TYPE]) {
2050 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2053 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2054 return PTR_ERR(type);
2057 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2060 if (type->type == NFT_CHAIN_T_NAT &&
2061 hook->priority <= NF_IP_PRI_CONNTRACK)
2064 if (!try_module_get(type->owner)) {
2065 if (nla[NFTA_CHAIN_TYPE])
2066 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2072 INIT_LIST_HEAD(&hook->list);
2073 if (nft_base_chain_netdev(family, hook->num)) {
2074 err = nft_chain_parse_netdev(net, ha, &hook->list);
2076 module_put(type->owner);
2079 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2080 module_put(type->owner);
2087 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2089 struct nft_hook *h, *next;
2091 list_for_each_entry_safe(h, next, &hook->list, list) {
2095 module_put(hook->type->owner);
2098 struct nft_rules_old {
2100 struct nft_rule_blob *blob;
2103 static void nft_last_rule(struct nft_rule_blob *blob, const void *ptr)
2105 struct nft_rule_dp *prule;
2107 prule = (struct nft_rule_dp *)ptr;
2109 /* blob size does not include the trailer rule */
2112 static struct nft_rule_blob *nf_tables_chain_alloc_rules(unsigned int size)
2114 struct nft_rule_blob *blob;
2116 /* size must include room for the last rule */
2117 if (size < offsetof(struct nft_rule_dp, data))
2120 size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rules_old);
2124 blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2129 nft_last_rule(blob, blob->data);
2134 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2135 const struct nft_chain_hook *hook,
2136 struct nft_chain *chain)
2139 ops->hooknum = hook->num;
2140 ops->priority = hook->priority;
2142 ops->hook = hook->type->hooks[ops->hooknum];
2143 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
2146 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2147 struct nft_chain_hook *hook, u32 flags)
2149 struct nft_chain *chain;
2152 basechain->type = hook->type;
2153 INIT_LIST_HEAD(&basechain->hook_list);
2154 chain = &basechain->chain;
2156 if (nft_base_chain_netdev(family, hook->num)) {
2157 list_splice_init(&hook->list, &basechain->hook_list);
2158 list_for_each_entry(h, &basechain->hook_list, list)
2159 nft_basechain_hook_init(&h->ops, family, hook, chain);
2161 basechain->ops.hooknum = hook->num;
2162 basechain->ops.priority = hook->priority;
2164 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2167 chain->flags |= NFT_CHAIN_BASE | flags;
2168 basechain->policy = NF_ACCEPT;
2169 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2170 !nft_chain_offload_support(basechain))
2173 flow_block_init(&basechain->flow_block);
2178 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2182 err = rhltable_insert_key(&table->chains_ht, chain->name,
2183 &chain->rhlhead, nft_chain_ht_params);
2187 list_add_tail_rcu(&chain->list, &table->chains);
2192 static u64 chain_id;
2194 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2195 u8 policy, u32 flags,
2196 struct netlink_ext_ack *extack)
2198 const struct nlattr * const *nla = ctx->nla;
2199 struct nft_table *table = ctx->table;
2200 struct nft_base_chain *basechain;
2201 struct nft_stats __percpu *stats;
2202 struct net *net = ctx->net;
2203 char name[NFT_NAME_MAXLEN];
2204 struct nft_rule_blob *blob;
2205 struct nft_trans *trans;
2206 struct nft_chain *chain;
2207 unsigned int data_size;
2210 if (table->use == UINT_MAX)
2213 if (nla[NFTA_CHAIN_HOOK]) {
2214 struct nft_chain_hook hook;
2216 if (flags & NFT_CHAIN_BINDING)
2219 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2224 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2225 if (basechain == NULL) {
2226 nft_chain_release_hook(&hook);
2229 chain = &basechain->chain;
2231 if (nla[NFTA_CHAIN_COUNTERS]) {
2232 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2233 if (IS_ERR(stats)) {
2234 nft_chain_release_hook(&hook);
2236 return PTR_ERR(stats);
2238 rcu_assign_pointer(basechain->stats, stats);
2239 static_branch_inc(&nft_counters_enabled);
2242 err = nft_basechain_init(basechain, family, &hook, flags);
2244 nft_chain_release_hook(&hook);
2249 if (flags & NFT_CHAIN_BASE)
2251 if (flags & NFT_CHAIN_HW_OFFLOAD)
2254 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2258 chain->flags = flags;
2262 INIT_LIST_HEAD(&chain->rules);
2263 chain->handle = nf_tables_alloc_handle(table);
2264 chain->table = table;
2266 if (nla[NFTA_CHAIN_NAME]) {
2267 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2269 if (!(flags & NFT_CHAIN_BINDING)) {
2271 goto err_destroy_chain;
2274 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2275 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2280 goto err_destroy_chain;
2283 if (nla[NFTA_CHAIN_USERDATA]) {
2284 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2285 if (chain->udata == NULL) {
2287 goto err_destroy_chain;
2289 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2292 data_size = offsetof(struct nft_rule_dp, data); /* last rule */
2293 blob = nf_tables_chain_alloc_rules(data_size);
2296 goto err_destroy_chain;
2299 RCU_INIT_POINTER(chain->blob_gen_0, blob);
2300 RCU_INIT_POINTER(chain->blob_gen_1, blob);
2302 err = nf_tables_register_hook(net, table, chain);
2304 goto err_destroy_chain;
2306 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2307 if (IS_ERR(trans)) {
2308 err = PTR_ERR(trans);
2309 goto err_unregister_hook;
2312 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2313 if (nft_is_base_chain(chain))
2314 nft_trans_chain_policy(trans) = policy;
2316 err = nft_chain_add(table, chain);
2318 nft_trans_destroy(trans);
2319 goto err_unregister_hook;
2325 err_unregister_hook:
2326 nf_tables_unregister_hook(net, table, chain);
2328 nf_tables_chain_destroy(ctx);
2333 static bool nft_hook_list_equal(struct list_head *hook_list1,
2334 struct list_head *hook_list2)
2336 struct nft_hook *hook;
2340 list_for_each_entry(hook, hook_list2, list) {
2341 if (!nft_hook_list_find(hook_list1, hook))
2346 list_for_each_entry(hook, hook_list1, list)
2352 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2353 u32 flags, const struct nlattr *attr,
2354 struct netlink_ext_ack *extack)
2356 const struct nlattr * const *nla = ctx->nla;
2357 struct nft_table *table = ctx->table;
2358 struct nft_chain *chain = ctx->chain;
2359 struct nft_base_chain *basechain;
2360 struct nft_stats *stats = NULL;
2361 struct nft_chain_hook hook;
2362 struct nf_hook_ops *ops;
2363 struct nft_trans *trans;
2366 if (chain->flags ^ flags)
2369 if (nla[NFTA_CHAIN_HOOK]) {
2370 if (!nft_is_base_chain(chain)) {
2371 NL_SET_BAD_ATTR(extack, attr);
2374 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2379 basechain = nft_base_chain(chain);
2380 if (basechain->type != hook.type) {
2381 nft_chain_release_hook(&hook);
2382 NL_SET_BAD_ATTR(extack, attr);
2386 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2387 if (!nft_hook_list_equal(&basechain->hook_list,
2389 nft_chain_release_hook(&hook);
2390 NL_SET_BAD_ATTR(extack, attr);
2394 ops = &basechain->ops;
2395 if (ops->hooknum != hook.num ||
2396 ops->priority != hook.priority) {
2397 nft_chain_release_hook(&hook);
2398 NL_SET_BAD_ATTR(extack, attr);
2402 nft_chain_release_hook(&hook);
2405 if (nla[NFTA_CHAIN_HANDLE] &&
2406 nla[NFTA_CHAIN_NAME]) {
2407 struct nft_chain *chain2;
2409 chain2 = nft_chain_lookup(ctx->net, table,
2410 nla[NFTA_CHAIN_NAME], genmask);
2411 if (!IS_ERR(chain2)) {
2412 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2417 if (nla[NFTA_CHAIN_COUNTERS]) {
2418 if (!nft_is_base_chain(chain))
2421 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2423 return PTR_ERR(stats);
2427 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2428 sizeof(struct nft_trans_chain));
2432 nft_trans_chain_stats(trans) = stats;
2433 nft_trans_chain_update(trans) = true;
2435 if (nla[NFTA_CHAIN_POLICY])
2436 nft_trans_chain_policy(trans) = policy;
2438 nft_trans_chain_policy(trans) = -1;
2440 if (nla[NFTA_CHAIN_HANDLE] &&
2441 nla[NFTA_CHAIN_NAME]) {
2442 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2443 struct nft_trans *tmp;
2447 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2452 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2453 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2454 tmp->ctx.table == table &&
2455 nft_trans_chain_update(tmp) &&
2456 nft_trans_chain_name(tmp) &&
2457 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2458 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2464 nft_trans_chain_name(trans) = name;
2466 nft_trans_commit_list_add_tail(ctx->net, trans);
2475 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2476 const struct nft_table *table,
2477 const struct nlattr *nla)
2479 struct nftables_pernet *nft_net = nft_pernet(net);
2480 u32 id = ntohl(nla_get_be32(nla));
2481 struct nft_trans *trans;
2483 list_for_each_entry(trans, &nft_net->commit_list, list) {
2484 struct nft_chain *chain = trans->ctx.chain;
2486 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2487 chain->table == table &&
2488 id == nft_trans_chain_id(trans))
2491 return ERR_PTR(-ENOENT);
2494 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2495 const struct nlattr * const nla[])
2497 struct nftables_pernet *nft_net = nft_pernet(info->net);
2498 struct netlink_ext_ack *extack = info->extack;
2499 u8 genmask = nft_genmask_next(info->net);
2500 u8 family = info->nfmsg->nfgen_family;
2501 struct nft_chain *chain = NULL;
2502 struct net *net = info->net;
2503 const struct nlattr *attr;
2504 struct nft_table *table;
2505 u8 policy = NF_ACCEPT;
2510 lockdep_assert_held(&nft_net->commit_mutex);
2512 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2513 NETLINK_CB(skb).portid);
2514 if (IS_ERR(table)) {
2515 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2516 return PTR_ERR(table);
2520 attr = nla[NFTA_CHAIN_NAME];
2522 if (nla[NFTA_CHAIN_HANDLE]) {
2523 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2524 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2525 if (IS_ERR(chain)) {
2526 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2527 return PTR_ERR(chain);
2529 attr = nla[NFTA_CHAIN_HANDLE];
2530 } else if (nla[NFTA_CHAIN_NAME]) {
2531 chain = nft_chain_lookup(net, table, attr, genmask);
2532 if (IS_ERR(chain)) {
2533 if (PTR_ERR(chain) != -ENOENT) {
2534 NL_SET_BAD_ATTR(extack, attr);
2535 return PTR_ERR(chain);
2539 } else if (!nla[NFTA_CHAIN_ID]) {
2543 if (nla[NFTA_CHAIN_POLICY]) {
2544 if (chain != NULL &&
2545 !nft_is_base_chain(chain)) {
2546 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2550 if (chain == NULL &&
2551 nla[NFTA_CHAIN_HOOK] == NULL) {
2552 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2556 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2566 if (nla[NFTA_CHAIN_FLAGS])
2567 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2569 flags = chain->flags;
2571 if (flags & ~NFT_CHAIN_FLAGS)
2574 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2576 if (chain != NULL) {
2577 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2578 NL_SET_BAD_ATTR(extack, attr);
2581 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2584 flags |= chain->flags & NFT_CHAIN_BASE;
2585 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2589 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2592 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2593 const struct nlattr * const nla[])
2595 struct netlink_ext_ack *extack = info->extack;
2596 u8 genmask = nft_genmask_next(info->net);
2597 u8 family = info->nfmsg->nfgen_family;
2598 struct net *net = info->net;
2599 const struct nlattr *attr;
2600 struct nft_table *table;
2601 struct nft_chain *chain;
2602 struct nft_rule *rule;
2608 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2609 NETLINK_CB(skb).portid);
2610 if (IS_ERR(table)) {
2611 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2612 return PTR_ERR(table);
2615 if (nla[NFTA_CHAIN_HANDLE]) {
2616 attr = nla[NFTA_CHAIN_HANDLE];
2617 handle = be64_to_cpu(nla_get_be64(attr));
2618 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2620 attr = nla[NFTA_CHAIN_NAME];
2621 chain = nft_chain_lookup(net, table, attr, genmask);
2623 if (IS_ERR(chain)) {
2624 NL_SET_BAD_ATTR(extack, attr);
2625 return PTR_ERR(chain);
2628 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2632 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2635 list_for_each_entry(rule, &chain->rules, list) {
2636 if (!nft_is_active_next(net, rule))
2640 err = nft_delrule(&ctx, rule);
2645 /* There are rules and elements that are still holding references to us,
2646 * we cannot do a recursive removal in this case.
2649 NL_SET_BAD_ATTR(extack, attr);
2653 return nft_delchain(&ctx);
2661 * nft_register_expr - register nf_tables expr type
2664 * Registers the expr type for use with nf_tables. Returns zero on
2665 * success or a negative errno code otherwise.
2667 int nft_register_expr(struct nft_expr_type *type)
2669 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2670 if (type->family == NFPROTO_UNSPEC)
2671 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2673 list_add_rcu(&type->list, &nf_tables_expressions);
2674 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2677 EXPORT_SYMBOL_GPL(nft_register_expr);
2680 * nft_unregister_expr - unregister nf_tables expr type
2683 * Unregisters the expr typefor use with nf_tables.
2685 void nft_unregister_expr(struct nft_expr_type *type)
2687 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2688 list_del_rcu(&type->list);
2689 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2691 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2693 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2696 const struct nft_expr_type *type, *candidate = NULL;
2698 list_for_each_entry(type, &nf_tables_expressions, list) {
2699 if (!nla_strcmp(nla, type->name)) {
2700 if (!type->family && !candidate)
2702 else if (type->family == family)
2709 #ifdef CONFIG_MODULES
2710 static int nft_expr_type_request_module(struct net *net, u8 family,
2713 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2714 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2721 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2725 const struct nft_expr_type *type;
2728 return ERR_PTR(-EINVAL);
2730 type = __nft_expr_type_get(family, nla);
2731 if (type != NULL && try_module_get(type->owner))
2734 lockdep_nfnl_nft_mutex_not_held();
2735 #ifdef CONFIG_MODULES
2737 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2738 return ERR_PTR(-EAGAIN);
2740 if (nft_request_module(net, "nft-expr-%.*s",
2742 (char *)nla_data(nla)) == -EAGAIN)
2743 return ERR_PTR(-EAGAIN);
2746 return ERR_PTR(-ENOENT);
2749 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2750 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2751 .len = NFT_MODULE_AUTOLOAD_LIMIT },
2752 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2755 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2756 const struct nft_expr *expr)
2758 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2759 goto nla_put_failure;
2761 if (expr->ops->dump) {
2762 struct nlattr *data = nla_nest_start_noflag(skb,
2765 goto nla_put_failure;
2766 if (expr->ops->dump(skb, expr) < 0)
2767 goto nla_put_failure;
2768 nla_nest_end(skb, data);
2777 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2778 const struct nft_expr *expr)
2780 struct nlattr *nest;
2782 nest = nla_nest_start_noflag(skb, attr);
2784 goto nla_put_failure;
2785 if (nf_tables_fill_expr_info(skb, expr) < 0)
2786 goto nla_put_failure;
2787 nla_nest_end(skb, nest);
2794 struct nft_expr_info {
2795 const struct nft_expr_ops *ops;
2796 const struct nlattr *attr;
2797 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2800 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2801 const struct nlattr *nla,
2802 struct nft_expr_info *info)
2804 const struct nft_expr_type *type;
2805 const struct nft_expr_ops *ops;
2806 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2809 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2810 nft_expr_policy, NULL);
2814 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2816 return PTR_ERR(type);
2818 if (tb[NFTA_EXPR_DATA]) {
2819 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2821 type->policy, NULL);
2825 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2827 if (type->select_ops != NULL) {
2828 ops = type->select_ops(ctx,
2829 (const struct nlattr * const *)info->tb);
2832 #ifdef CONFIG_MODULES
2834 if (nft_expr_type_request_module(ctx->net,
2836 tb[NFTA_EXPR_NAME]) != -EAGAIN)
2850 module_put(type->owner);
2854 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2855 const struct nft_expr_info *expr_info,
2856 struct nft_expr *expr)
2858 const struct nft_expr_ops *ops = expr_info->ops;
2863 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2874 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2875 struct nft_expr *expr)
2877 const struct nft_expr_type *type = expr->ops->type;
2879 if (expr->ops->destroy)
2880 expr->ops->destroy(ctx, expr);
2881 module_put(type->owner);
2884 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2885 const struct nlattr *nla)
2887 struct nft_expr_info expr_info;
2888 struct nft_expr *expr;
2889 struct module *owner;
2892 err = nf_tables_expr_parse(ctx, nla, &expr_info);
2894 goto err_expr_parse;
2897 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
2898 goto err_expr_stateful;
2901 expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
2903 goto err_expr_stateful;
2905 err = nf_tables_newexpr(ctx, &expr_info, expr);
2913 owner = expr_info.ops->type->owner;
2914 if (expr_info.ops->type->release_ops)
2915 expr_info.ops->type->release_ops(expr_info.ops);
2919 return ERR_PTR(err);
2922 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2926 if (src->ops->clone) {
2927 dst->ops = src->ops;
2928 err = src->ops->clone(dst, src);
2932 memcpy(dst, src, src->ops->size);
2935 __module_get(src->ops->type->owner);
2940 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2942 nf_tables_expr_destroy(ctx, expr);
2950 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2953 struct nft_rule *rule;
2955 // FIXME: this sucks
2956 list_for_each_entry_rcu(rule, &chain->rules, list) {
2957 if (handle == rule->handle)
2961 return ERR_PTR(-ENOENT);
2964 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2965 const struct nlattr *nla)
2968 return ERR_PTR(-EINVAL);
2970 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2973 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2974 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2975 .len = NFT_TABLE_MAXNAMELEN - 1 },
2976 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2977 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2978 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2979 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2980 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2981 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2982 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2983 .len = NFT_USERDATA_MAXLEN },
2984 [NFTA_RULE_ID] = { .type = NLA_U32 },
2985 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2986 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
2989 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2990 u32 portid, u32 seq, int event,
2991 u32 flags, int family,
2992 const struct nft_table *table,
2993 const struct nft_chain *chain,
2994 const struct nft_rule *rule, u64 handle)
2996 struct nlmsghdr *nlh;
2997 const struct nft_expr *expr, *next;
2998 struct nlattr *list;
2999 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3001 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3004 goto nla_put_failure;
3006 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3007 goto nla_put_failure;
3008 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3009 goto nla_put_failure;
3010 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3012 goto nla_put_failure;
3014 if (event != NFT_MSG_DELRULE && handle) {
3015 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3017 goto nla_put_failure;
3020 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3021 nft_flow_rule_stats(chain, rule);
3023 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3025 goto nla_put_failure;
3026 nft_rule_for_each_expr(expr, next, rule) {
3027 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
3028 goto nla_put_failure;
3030 nla_nest_end(skb, list);
3033 struct nft_userdata *udata = nft_userdata(rule);
3034 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3036 goto nla_put_failure;
3039 nlmsg_end(skb, nlh);
3043 nlmsg_trim(skb, nlh);
3047 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3048 const struct nft_rule *rule, int event)
3050 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3051 const struct nft_rule *prule;
3052 struct sk_buff *skb;
3058 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3061 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3065 if (event == NFT_MSG_NEWRULE &&
3066 !list_is_first(&rule->list, &ctx->chain->rules) &&
3067 !list_is_last(&rule->list, &ctx->chain->rules)) {
3068 prule = list_prev_entry(rule, list);
3069 handle = prule->handle;
3071 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3072 flags |= NLM_F_APPEND;
3073 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3074 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3076 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3077 event, flags, ctx->family, ctx->table,
3078 ctx->chain, rule, handle);
3084 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3087 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3090 struct nft_rule_dump_ctx {
3095 static int __nf_tables_dump_rules(struct sk_buff *skb,
3097 struct netlink_callback *cb,
3098 const struct nft_table *table,
3099 const struct nft_chain *chain)
3101 struct net *net = sock_net(skb->sk);
3102 const struct nft_rule *rule, *prule;
3103 unsigned int s_idx = cb->args[0];
3107 list_for_each_entry_rcu(rule, &chain->rules, list) {
3108 if (!nft_is_active(net, rule))
3113 memset(&cb->args[1], 0,
3114 sizeof(cb->args) - sizeof(cb->args[0]));
3117 handle = prule->handle;
3121 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3124 NLM_F_MULTI | NLM_F_APPEND,
3126 table, chain, rule, handle) < 0)
3129 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3138 static int nf_tables_dump_rules(struct sk_buff *skb,
3139 struct netlink_callback *cb)
3141 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3142 const struct nft_rule_dump_ctx *ctx = cb->data;
3143 struct nft_table *table;
3144 const struct nft_chain *chain;
3145 unsigned int idx = 0;
3146 struct net *net = sock_net(skb->sk);
3147 int family = nfmsg->nfgen_family;
3148 struct nftables_pernet *nft_net;
3151 nft_net = nft_pernet(net);
3152 cb->seq = READ_ONCE(nft_net->base_seq);
3154 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3155 if (family != NFPROTO_UNSPEC && family != table->family)
3158 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3161 if (ctx && ctx->table && ctx->chain) {
3162 struct rhlist_head *list, *tmp;
3164 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3165 nft_chain_ht_params);
3169 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3170 if (!nft_is_active(net, chain))
3172 __nf_tables_dump_rules(skb, &idx,
3179 list_for_each_entry_rcu(chain, &table->chains, list) {
3180 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
3184 if (ctx && ctx->table)
3194 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3196 const struct nlattr * const *nla = cb->data;
3197 struct nft_rule_dump_ctx *ctx = NULL;
3199 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3200 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3204 if (nla[NFTA_RULE_TABLE]) {
3205 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3212 if (nla[NFTA_RULE_CHAIN]) {
3213 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3227 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3229 struct nft_rule_dump_ctx *ctx = cb->data;
3239 /* called with rcu_read_lock held */
3240 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3241 const struct nlattr * const nla[])
3243 struct netlink_ext_ack *extack = info->extack;
3244 u8 genmask = nft_genmask_cur(info->net);
3245 u8 family = info->nfmsg->nfgen_family;
3246 const struct nft_chain *chain;
3247 const struct nft_rule *rule;
3248 struct net *net = info->net;
3249 struct nft_table *table;
3250 struct sk_buff *skb2;
3253 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3254 struct netlink_dump_control c = {
3255 .start= nf_tables_dump_rules_start,
3256 .dump = nf_tables_dump_rules,
3257 .done = nf_tables_dump_rules_done,
3258 .module = THIS_MODULE,
3259 .data = (void *)nla,
3262 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3265 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3266 if (IS_ERR(table)) {
3267 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3268 return PTR_ERR(table);
3271 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3272 if (IS_ERR(chain)) {
3273 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3274 return PTR_ERR(chain);
3277 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3279 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3280 return PTR_ERR(rule);
3283 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3287 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3288 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3289 family, table, chain, rule, 0);
3291 goto err_fill_rule_info;
3293 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3300 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3301 struct nft_rule *rule)
3303 struct nft_expr *expr, *next;
3306 * Careful: some expressions might not be initialized in case this
3307 * is called on error from nf_tables_newrule().
3309 expr = nft_expr_first(rule);
3310 while (nft_expr_more(rule, expr)) {
3311 next = nft_expr_next(expr);
3312 nf_tables_expr_destroy(ctx, expr);
3318 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3320 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3321 nf_tables_rule_destroy(ctx, rule);
3324 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3326 struct nft_expr *expr, *last;
3327 const struct nft_data *data;
3328 struct nft_rule *rule;
3331 if (ctx->level == NFT_JUMP_STACK_SIZE)
3334 list_for_each_entry(rule, &chain->rules, list) {
3335 if (!nft_is_active_next(ctx->net, rule))
3338 nft_rule_for_each_expr(expr, last, rule) {
3339 if (!expr->ops->validate)
3342 err = expr->ops->validate(ctx, expr, &data);
3352 EXPORT_SYMBOL_GPL(nft_chain_validate);
3354 static int nft_table_validate(struct net *net, const struct nft_table *table)
3356 struct nft_chain *chain;
3357 struct nft_ctx ctx = {
3359 .family = table->family,
3363 list_for_each_entry(chain, &table->chains, list) {
3364 if (!nft_is_base_chain(chain))
3368 err = nft_chain_validate(&ctx, chain);
3376 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3377 const struct nft_chain *chain,
3378 const struct nlattr *nla);
3380 #define NFT_RULE_MAXEXPRS 128
3382 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3383 const struct nlattr * const nla[])
3385 struct nftables_pernet *nft_net = nft_pernet(info->net);
3386 struct netlink_ext_ack *extack = info->extack;
3387 unsigned int size, i, n, ulen = 0, usize = 0;
3388 u8 genmask = nft_genmask_next(info->net);
3389 struct nft_rule *rule, *old_rule = NULL;
3390 struct nft_expr_info *expr_info = NULL;
3391 u8 family = info->nfmsg->nfgen_family;
3392 struct nft_flow_rule *flow = NULL;
3393 struct net *net = info->net;
3394 struct nft_userdata *udata;
3395 struct nft_table *table;
3396 struct nft_chain *chain;
3397 struct nft_trans *trans;
3398 u64 handle, pos_handle;
3399 struct nft_expr *expr;
3404 lockdep_assert_held(&nft_net->commit_mutex);
3406 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3407 NETLINK_CB(skb).portid);
3408 if (IS_ERR(table)) {
3409 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3410 return PTR_ERR(table);
3413 if (nla[NFTA_RULE_CHAIN]) {
3414 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3416 if (IS_ERR(chain)) {
3417 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3418 return PTR_ERR(chain);
3420 if (nft_chain_is_bound(chain))
3423 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3424 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
3425 if (IS_ERR(chain)) {
3426 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3427 return PTR_ERR(chain);
3433 if (nla[NFTA_RULE_HANDLE]) {
3434 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3435 rule = __nft_rule_lookup(chain, handle);
3437 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3438 return PTR_ERR(rule);
3441 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3442 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3445 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3450 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3451 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3453 handle = nf_tables_alloc_handle(table);
3455 if (chain->use == UINT_MAX)
3458 if (nla[NFTA_RULE_POSITION]) {
3459 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3460 old_rule = __nft_rule_lookup(chain, pos_handle);
3461 if (IS_ERR(old_rule)) {
3462 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3463 return PTR_ERR(old_rule);
3465 } else if (nla[NFTA_RULE_POSITION_ID]) {
3466 old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3467 if (IS_ERR(old_rule)) {
3468 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3469 return PTR_ERR(old_rule);
3474 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3478 if (nla[NFTA_RULE_EXPRESSIONS]) {
3479 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3480 sizeof(struct nft_expr_info),
3485 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3487 if (nla_type(tmp) != NFTA_LIST_ELEM)
3488 goto err_release_expr;
3489 if (n == NFT_RULE_MAXEXPRS)
3490 goto err_release_expr;
3491 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3493 NL_SET_BAD_ATTR(extack, tmp);
3494 goto err_release_expr;
3496 size += expr_info[n].ops->size;
3500 /* Check for overflow of dlen field */
3502 if (size >= 1 << 12)
3503 goto err_release_expr;
3505 if (nla[NFTA_RULE_USERDATA]) {
3506 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3508 usize = sizeof(struct nft_userdata) + ulen;
3512 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3514 goto err_release_expr;
3516 nft_activate_next(net, rule);
3518 rule->handle = handle;
3520 rule->udata = ulen ? 1 : 0;
3523 udata = nft_userdata(rule);
3524 udata->len = ulen - 1;
3525 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3528 expr = nft_expr_first(rule);
3529 for (i = 0; i < n; i++) {
3530 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3532 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3533 goto err_release_rule;
3536 if (expr_info[i].ops->validate)
3537 nft_validate_state_update(net, NFT_VALIDATE_NEED);
3539 expr_info[i].ops = NULL;
3540 expr = nft_expr_next(expr);
3543 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3544 flow = nft_flow_rule_create(net, rule);
3546 err = PTR_ERR(flow);
3547 goto err_release_rule;
3551 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3552 err = nft_delrule(&ctx, old_rule);
3554 goto err_destroy_flow_rule;
3556 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3557 if (trans == NULL) {
3559 goto err_destroy_flow_rule;
3561 list_add_tail_rcu(&rule->list, &old_rule->list);
3563 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3566 goto err_destroy_flow_rule;
3569 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3571 list_add_rcu(&rule->list, &old_rule->list);
3573 list_add_tail_rcu(&rule->list, &chain->rules);
3576 list_add_tail_rcu(&rule->list, &old_rule->list);
3578 list_add_rcu(&rule->list, &chain->rules);
3585 nft_trans_flow_rule(trans) = flow;
3587 if (nft_net->validate_state == NFT_VALIDATE_DO)
3588 return nft_table_validate(net, table);
3592 err_destroy_flow_rule:
3594 nft_flow_rule_destroy(flow);
3596 nf_tables_rule_release(&ctx, rule);
3598 for (i = 0; i < n; i++) {
3599 if (expr_info[i].ops) {
3600 module_put(expr_info[i].ops->type->owner);
3601 if (expr_info[i].ops->type->release_ops)
3602 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3610 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3611 const struct nft_chain *chain,
3612 const struct nlattr *nla)
3614 struct nftables_pernet *nft_net = nft_pernet(net);
3615 u32 id = ntohl(nla_get_be32(nla));
3616 struct nft_trans *trans;
3618 list_for_each_entry(trans, &nft_net->commit_list, list) {
3619 struct nft_rule *rule = nft_trans_rule(trans);
3621 if (trans->msg_type == NFT_MSG_NEWRULE &&
3622 trans->ctx.chain == chain &&
3623 id == nft_trans_rule_id(trans))
3626 return ERR_PTR(-ENOENT);
3629 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3630 const struct nlattr * const nla[])
3632 struct netlink_ext_ack *extack = info->extack;
3633 u8 genmask = nft_genmask_next(info->net);
3634 u8 family = info->nfmsg->nfgen_family;
3635 struct nft_chain *chain = NULL;
3636 struct net *net = info->net;
3637 struct nft_table *table;
3638 struct nft_rule *rule;
3642 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3643 NETLINK_CB(skb).portid);
3644 if (IS_ERR(table)) {
3645 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3646 return PTR_ERR(table);
3649 if (nla[NFTA_RULE_CHAIN]) {
3650 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3652 if (IS_ERR(chain)) {
3653 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3654 return PTR_ERR(chain);
3656 if (nft_chain_is_bound(chain))
3660 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3663 if (nla[NFTA_RULE_HANDLE]) {
3664 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3666 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3667 return PTR_ERR(rule);
3670 err = nft_delrule(&ctx, rule);
3671 } else if (nla[NFTA_RULE_ID]) {
3672 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
3674 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3675 return PTR_ERR(rule);
3678 err = nft_delrule(&ctx, rule);
3680 err = nft_delrule_by_chain(&ctx);
3683 list_for_each_entry(chain, &table->chains, list) {
3684 if (!nft_is_active_next(net, chain))
3688 err = nft_delrule_by_chain(&ctx);
3700 static const struct nft_set_type *nft_set_types[] = {
3701 &nft_set_hash_fast_type,
3703 &nft_set_rhash_type,
3704 &nft_set_bitmap_type,
3705 &nft_set_rbtree_type,
3706 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3707 &nft_set_pipapo_avx2_type,
3709 &nft_set_pipapo_type,
3712 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
3713 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3716 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3718 return (flags & type->features) == (flags & NFT_SET_FEATURES);
3722 * Select a set implementation based on the data characteristics and the
3723 * given policy. The total memory use might not be known if no size is
3724 * given, in that case the amount of memory per element is used.
3726 static const struct nft_set_ops *
3727 nft_select_set_ops(const struct nft_ctx *ctx,
3728 const struct nlattr * const nla[],
3729 const struct nft_set_desc *desc,
3730 enum nft_set_policies policy)
3732 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3733 const struct nft_set_ops *ops, *bops;
3734 struct nft_set_estimate est, best;
3735 const struct nft_set_type *type;
3739 lockdep_assert_held(&nft_net->commit_mutex);
3740 lockdep_nfnl_nft_mutex_not_held();
3742 if (nla[NFTA_SET_FLAGS] != NULL)
3743 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3750 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3751 type = nft_set_types[i];
3754 if (!nft_set_ops_candidate(type, flags))
3756 if (!ops->estimate(desc, flags, &est))
3760 case NFT_SET_POL_PERFORMANCE:
3761 if (est.lookup < best.lookup)
3763 if (est.lookup == best.lookup &&
3764 est.space < best.space)
3767 case NFT_SET_POL_MEMORY:
3769 if (est.space < best.space)
3771 if (est.space == best.space &&
3772 est.lookup < best.lookup)
3774 } else if (est.size < best.size || !bops) {
3789 return ERR_PTR(-EOPNOTSUPP);
3792 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3793 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3794 .len = NFT_TABLE_MAXNAMELEN - 1 },
3795 [NFTA_SET_NAME] = { .type = NLA_STRING,
3796 .len = NFT_SET_MAXNAMELEN - 1 },
3797 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3798 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3799 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3800 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3801 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
3802 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3803 [NFTA_SET_DESC] = { .type = NLA_NESTED },
3804 [NFTA_SET_ID] = { .type = NLA_U32 },
3805 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3806 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
3807 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3808 .len = NFT_USERDATA_MAXLEN },
3809 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3810 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
3811 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
3812 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
3815 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3816 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
3817 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
3820 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3821 const struct nlattr *nla, u8 genmask)
3823 struct nft_set *set;
3826 return ERR_PTR(-EINVAL);
3828 list_for_each_entry_rcu(set, &table->sets, list) {
3829 if (!nla_strcmp(nla, set->name) &&
3830 nft_active_genmask(set, genmask))
3833 return ERR_PTR(-ENOENT);
3836 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3837 const struct nlattr *nla,
3840 struct nft_set *set;
3842 list_for_each_entry(set, &table->sets, list) {
3843 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3844 nft_active_genmask(set, genmask))
3847 return ERR_PTR(-ENOENT);
3850 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3851 const struct nft_table *table,
3852 const struct nlattr *nla, u8 genmask)
3854 struct nftables_pernet *nft_net = nft_pernet(net);
3855 u32 id = ntohl(nla_get_be32(nla));
3856 struct nft_trans *trans;
3858 list_for_each_entry(trans, &nft_net->commit_list, list) {
3859 if (trans->msg_type == NFT_MSG_NEWSET) {
3860 struct nft_set *set = nft_trans_set(trans);
3862 if (id == nft_trans_set_id(trans) &&
3863 set->table == table &&
3864 nft_active_genmask(set, genmask))
3868 return ERR_PTR(-ENOENT);
3871 struct nft_set *nft_set_lookup_global(const struct net *net,
3872 const struct nft_table *table,
3873 const struct nlattr *nla_set_name,
3874 const struct nlattr *nla_set_id,
3877 struct nft_set *set;
3879 set = nft_set_lookup(table, nla_set_name, genmask);
3884 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
3888 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3890 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3893 const struct nft_set *i;
3895 unsigned long *inuse;
3896 unsigned int n = 0, min = 0;
3898 p = strchr(name, '%');
3900 if (p[1] != 'd' || strchr(p + 2, '%'))
3903 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3907 list_for_each_entry(i, &ctx->table->sets, list) {
3910 if (!nft_is_active_next(ctx->net, i))
3912 if (!sscanf(i->name, name, &tmp))
3914 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3917 set_bit(tmp - min, inuse);
3920 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3921 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3922 min += BITS_PER_BYTE * PAGE_SIZE;
3923 memset(inuse, 0, PAGE_SIZE);
3926 free_page((unsigned long)inuse);
3929 set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
3933 list_for_each_entry(i, &ctx->table->sets, list) {
3934 if (!nft_is_active_next(ctx->net, i))
3936 if (!strcmp(set->name, i->name)) {
3945 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3947 u64 ms = be64_to_cpu(nla_get_be64(nla));
3948 u64 max = (u64)(~((u64)0));
3950 max = div_u64(max, NSEC_PER_MSEC);
3954 ms *= NSEC_PER_MSEC;
3955 *result = nsecs_to_jiffies64(ms);
3959 __be64 nf_jiffies64_to_msecs(u64 input)
3961 return cpu_to_be64(jiffies64_to_msecs(input));
3964 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3965 const struct nft_set *set)
3967 struct nlattr *concat, *field;
3970 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3974 for (i = 0; i < set->field_count; i++) {
3975 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3979 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3980 htonl(set->field_len[i])))
3983 nla_nest_end(skb, field);
3986 nla_nest_end(skb, concat);
3991 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3992 const struct nft_set *set, u16 event, u16 flags)
3994 struct nlmsghdr *nlh;
3995 u32 portid = ctx->portid;
3996 struct nlattr *nest;
4000 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4001 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4002 NFNETLINK_V0, nft_base_seq(ctx->net));
4004 goto nla_put_failure;
4006 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4007 goto nla_put_failure;
4008 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4009 goto nla_put_failure;
4010 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4012 goto nla_put_failure;
4013 if (set->flags != 0)
4014 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4015 goto nla_put_failure;
4017 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4018 goto nla_put_failure;
4019 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4020 goto nla_put_failure;
4021 if (set->flags & NFT_SET_MAP) {
4022 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4023 goto nla_put_failure;
4024 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4025 goto nla_put_failure;
4027 if (set->flags & NFT_SET_OBJECT &&
4028 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4029 goto nla_put_failure;
4032 nla_put_be64(skb, NFTA_SET_TIMEOUT,
4033 nf_jiffies64_to_msecs(set->timeout),
4035 goto nla_put_failure;
4037 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
4038 goto nla_put_failure;
4040 if (set->policy != NFT_SET_POL_PERFORMANCE) {
4041 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4042 goto nla_put_failure;
4046 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4047 goto nla_put_failure;
4049 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4051 goto nla_put_failure;
4053 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4054 goto nla_put_failure;
4056 if (set->field_count > 1 &&
4057 nf_tables_fill_set_concat(skb, set))
4058 goto nla_put_failure;
4060 nla_nest_end(skb, nest);
4062 if (set->num_exprs == 1) {
4063 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4064 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
4065 goto nla_put_failure;
4067 nla_nest_end(skb, nest);
4068 } else if (set->num_exprs > 1) {
4069 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4071 goto nla_put_failure;
4073 for (i = 0; i < set->num_exprs; i++) {
4074 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4076 goto nla_put_failure;
4078 nla_nest_end(skb, nest);
4081 nlmsg_end(skb, nlh);
4085 nlmsg_trim(skb, nlh);
4089 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4090 const struct nft_set *set, int event,
4093 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4094 u32 portid = ctx->portid;
4095 struct sk_buff *skb;
4100 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4103 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4107 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4108 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4110 err = nf_tables_fill_set(skb, ctx, set, event, flags);
4116 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4119 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4122 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4124 const struct nft_set *set;
4125 unsigned int idx, s_idx = cb->args[0];
4126 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4127 struct net *net = sock_net(skb->sk);
4128 struct nft_ctx *ctx = cb->data, ctx_set;
4129 struct nftables_pernet *nft_net;
4135 nft_net = nft_pernet(net);
4136 cb->seq = READ_ONCE(nft_net->base_seq);
4138 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4139 if (ctx->family != NFPROTO_UNSPEC &&
4140 ctx->family != table->family)
4143 if (ctx->table && ctx->table != table)
4147 if (cur_table != table)
4153 list_for_each_entry_rcu(set, &table->sets, list) {
4156 if (!nft_is_active(net, set))
4160 ctx_set.table = table;
4161 ctx_set.family = table->family;
4163 if (nf_tables_fill_set(skb, &ctx_set, set,
4167 cb->args[2] = (unsigned long) table;
4170 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4183 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4185 struct nft_ctx *ctx_dump = NULL;
4187 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4188 if (ctx_dump == NULL)
4191 cb->data = ctx_dump;
4195 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4201 /* called with rcu_read_lock held */
4202 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4203 const struct nlattr * const nla[])
4205 struct netlink_ext_ack *extack = info->extack;
4206 u8 genmask = nft_genmask_cur(info->net);
4207 u8 family = info->nfmsg->nfgen_family;
4208 struct nft_table *table = NULL;
4209 struct net *net = info->net;
4210 const struct nft_set *set;
4211 struct sk_buff *skb2;
4215 if (nla[NFTA_SET_TABLE]) {
4216 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4218 if (IS_ERR(table)) {
4219 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4220 return PTR_ERR(table);
4224 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4226 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4227 struct netlink_dump_control c = {
4228 .start = nf_tables_dump_sets_start,
4229 .dump = nf_tables_dump_sets,
4230 .done = nf_tables_dump_sets_done,
4232 .module = THIS_MODULE,
4235 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4238 /* Only accept unspec with dump */
4239 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4240 return -EAFNOSUPPORT;
4241 if (!nla[NFTA_SET_TABLE])
4244 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4246 return PTR_ERR(set);
4248 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4252 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4254 goto err_fill_set_info;
4256 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4263 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4264 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4267 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4268 struct nft_set_desc *desc)
4270 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4274 if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4277 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4278 nft_concat_policy, NULL);
4282 if (!tb[NFTA_SET_FIELD_LEN])
4285 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4286 if (!len || len > U8_MAX)
4289 desc->field_len[desc->field_count++] = len;
4294 static int nft_set_desc_concat(struct nft_set_desc *desc,
4295 const struct nlattr *nla)
4297 struct nlattr *attr;
4301 nla_for_each_nested(attr, nla, rem) {
4302 if (nla_type(attr) != NFTA_LIST_ELEM)
4305 err = nft_set_desc_concat_parse(attr, desc);
4310 for (i = 0; i < desc->field_count; i++)
4311 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4313 if (num_regs > NFT_REG32_COUNT)
4319 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4320 const struct nlattr *nla)
4322 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4325 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4326 nft_set_desc_policy, NULL);
4330 if (da[NFTA_SET_DESC_SIZE] != NULL)
4331 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4332 if (da[NFTA_SET_DESC_CONCAT])
4333 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4338 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4339 const struct nlattr * const nla[])
4341 u32 ktype, dtype, flags, policy, gc_int, objtype;
4342 struct netlink_ext_ack *extack = info->extack;
4343 u8 genmask = nft_genmask_next(info->net);
4344 u8 family = info->nfmsg->nfgen_family;
4345 const struct nft_set_ops *ops;
4346 struct nft_expr *expr = NULL;
4347 struct net *net = info->net;
4348 struct nft_set_desc desc;
4349 struct nft_table *table;
4350 unsigned char *udata;
4351 struct nft_set *set;
4360 if (nla[NFTA_SET_TABLE] == NULL ||
4361 nla[NFTA_SET_NAME] == NULL ||
4362 nla[NFTA_SET_KEY_LEN] == NULL ||
4363 nla[NFTA_SET_ID] == NULL)
4366 memset(&desc, 0, sizeof(desc));
4368 ktype = NFT_DATA_VALUE;
4369 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4370 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4371 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4375 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4376 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4380 if (nla[NFTA_SET_FLAGS] != NULL) {
4381 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4382 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4383 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4384 NFT_SET_MAP | NFT_SET_EVAL |
4385 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4387 /* Only one of these operations is supported */
4388 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4389 (NFT_SET_MAP | NFT_SET_OBJECT))
4391 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4392 (NFT_SET_EVAL | NFT_SET_OBJECT))
4397 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4398 if (!(flags & NFT_SET_MAP))
4401 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4402 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4403 dtype != NFT_DATA_VERDICT)
4406 if (dtype != NFT_DATA_VERDICT) {
4407 if (nla[NFTA_SET_DATA_LEN] == NULL)
4409 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4410 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4413 desc.dlen = sizeof(struct nft_verdict);
4414 } else if (flags & NFT_SET_MAP)
4417 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4418 if (!(flags & NFT_SET_OBJECT))
4421 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4422 if (objtype == NFT_OBJECT_UNSPEC ||
4423 objtype > NFT_OBJECT_MAX)
4425 } else if (flags & NFT_SET_OBJECT)
4428 objtype = NFT_OBJECT_UNSPEC;
4431 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4432 if (!(flags & NFT_SET_TIMEOUT))
4435 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4440 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4441 if (!(flags & NFT_SET_TIMEOUT))
4443 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4446 policy = NFT_SET_POL_PERFORMANCE;
4447 if (nla[NFTA_SET_POLICY] != NULL)
4448 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4450 if (nla[NFTA_SET_DESC] != NULL) {
4451 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4456 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4459 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4460 NETLINK_CB(skb).portid);
4461 if (IS_ERR(table)) {
4462 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4463 return PTR_ERR(table);
4466 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4468 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4470 if (PTR_ERR(set) != -ENOENT) {
4471 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4472 return PTR_ERR(set);
4475 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4476 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4479 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4485 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4488 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4490 return PTR_ERR(ops);
4493 if (nla[NFTA_SET_USERDATA])
4494 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4497 if (ops->privsize != NULL)
4498 size = ops->privsize(nla, &desc);
4499 alloc_size = sizeof(*set) + size + udlen;
4500 if (alloc_size < size || alloc_size > INT_MAX)
4502 set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
4506 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
4512 err = nf_tables_set_alloc_name(&ctx, set, name);
4519 udata = set->data + size;
4520 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4523 INIT_LIST_HEAD(&set->bindings);
4524 INIT_LIST_HEAD(&set->catchall_list);
4526 write_pnet(&set->net, net);
4529 set->klen = desc.klen;
4531 set->objtype = objtype;
4532 set->dlen = desc.dlen;
4534 set->size = desc.size;
4535 set->policy = policy;
4538 set->timeout = timeout;
4539 set->gc_int = gc_int;
4541 set->field_count = desc.field_count;
4542 for (i = 0; i < desc.field_count; i++)
4543 set->field_len[i] = desc.field_len[i];
4545 err = ops->init(set, &desc, nla);
4549 if (nla[NFTA_SET_EXPR]) {
4550 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4552 err = PTR_ERR(expr);
4553 goto err_set_expr_alloc;
4555 set->exprs[0] = expr;
4557 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4558 struct nft_expr *expr;
4562 if (!(flags & NFT_SET_EXPR)) {
4564 goto err_set_expr_alloc;
4567 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4568 if (i == NFT_SET_EXPR_MAX) {
4570 goto err_set_expr_alloc;
4572 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4574 goto err_set_expr_alloc;
4576 expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
4578 err = PTR_ERR(expr);
4579 goto err_set_expr_alloc;
4581 set->exprs[i++] = expr;
4586 set->handle = nf_tables_alloc_handle(table);
4588 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4590 goto err_set_expr_alloc;
4592 list_add_tail_rcu(&set->list, &table->sets);
4597 for (i = 0; i < set->num_exprs; i++)
4598 nft_expr_destroy(&ctx, set->exprs[i]);
4608 struct nft_set_elem_catchall {
4609 struct list_head list;
4610 struct rcu_head rcu;
4614 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4615 struct nft_set *set)
4617 struct nft_set_elem_catchall *next, *catchall;
4619 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4620 list_del_rcu(&catchall->list);
4621 nft_set_elem_destroy(set, catchall->elem, true);
4622 kfree_rcu(catchall, rcu);
4626 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4630 if (WARN_ON(set->use > 0))
4633 for (i = 0; i < set->num_exprs; i++)
4634 nft_expr_destroy(ctx, set->exprs[i]);
4636 set->ops->destroy(set);
4637 nft_set_catchall_destroy(ctx, set);
4642 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4643 const struct nlattr * const nla[])
4645 struct netlink_ext_ack *extack = info->extack;
4646 u8 genmask = nft_genmask_next(info->net);
4647 u8 family = info->nfmsg->nfgen_family;
4648 struct net *net = info->net;
4649 const struct nlattr *attr;
4650 struct nft_table *table;
4651 struct nft_set *set;
4654 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4655 return -EAFNOSUPPORT;
4657 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4658 genmask, NETLINK_CB(skb).portid);
4659 if (IS_ERR(table)) {
4660 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4661 return PTR_ERR(table);
4664 if (nla[NFTA_SET_HANDLE]) {
4665 attr = nla[NFTA_SET_HANDLE];
4666 set = nft_set_lookup_byhandle(table, attr, genmask);
4668 attr = nla[NFTA_SET_NAME];
4669 set = nft_set_lookup(table, attr, genmask);
4673 NL_SET_BAD_ATTR(extack, attr);
4674 return PTR_ERR(set);
4677 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4678 atomic_read(&set->nelems) > 0)) {
4679 NL_SET_BAD_ATTR(extack, attr);
4683 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4685 return nft_delset(&ctx, set);
4688 static int nft_validate_register_store(const struct nft_ctx *ctx,
4689 enum nft_registers reg,
4690 const struct nft_data *data,
4691 enum nft_data_types type,
4694 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4695 struct nft_set *set,
4696 struct nft_set_elem *elem)
4698 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4699 enum nft_registers dreg;
4701 dreg = nft_type_to_reg(set->dtype);
4702 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4703 set->dtype == NFT_DATA_VERDICT ?
4704 NFT_DATA_VERDICT : NFT_DATA_VALUE,
4708 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4709 struct nft_set *set,
4710 const struct nft_set_iter *iter,
4711 struct nft_set_elem *elem)
4713 return nft_setelem_data_validate(ctx, set, elem);
4716 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4717 struct nft_set *set)
4719 u8 genmask = nft_genmask_next(ctx->net);
4720 struct nft_set_elem_catchall *catchall;
4721 struct nft_set_elem elem;
4722 struct nft_set_ext *ext;
4725 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4726 ext = nft_set_elem_ext(set, catchall->elem);
4727 if (!nft_set_elem_active(ext, genmask))
4730 elem.priv = catchall->elem;
4731 ret = nft_setelem_data_validate(ctx, set, &elem);
4739 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4740 struct nft_set_binding *binding)
4742 struct nft_set_binding *i;
4743 struct nft_set_iter iter;
4745 if (set->use == UINT_MAX)
4748 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4751 if (binding->flags & NFT_SET_MAP) {
4752 /* If the set is already bound to the same chain all
4753 * jumps are already validated for that chain.
4755 list_for_each_entry(i, &set->bindings, list) {
4756 if (i->flags & NFT_SET_MAP &&
4757 i->chain == binding->chain)
4761 iter.genmask = nft_genmask_next(ctx->net);
4765 iter.fn = nf_tables_bind_check_setelem;
4767 set->ops->walk(ctx, set, &iter);
4769 iter.err = nft_set_catchall_bind_check(ctx, set);
4775 binding->chain = ctx->chain;
4776 list_add_tail_rcu(&binding->list, &set->bindings);
4777 nft_set_trans_bind(ctx, set);
4782 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4784 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4785 struct nft_set_binding *binding, bool event)
4787 list_del_rcu(&binding->list);
4789 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4790 list_del_rcu(&set->list);
4792 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4797 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4798 struct nft_set_binding *binding,
4799 enum nft_trans_phase phase)
4802 case NFT_TRANS_PREPARE:
4805 case NFT_TRANS_ABORT:
4806 case NFT_TRANS_RELEASE:
4810 nf_tables_unbind_set(ctx, set, binding,
4811 phase == NFT_TRANS_COMMIT);
4814 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4816 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4818 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4819 nft_set_destroy(ctx, set);
4821 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4823 const struct nft_set_ext_type nft_set_ext_types[] = {
4824 [NFT_SET_EXT_KEY] = {
4825 .align = __alignof__(u32),
4827 [NFT_SET_EXT_DATA] = {
4828 .align = __alignof__(u32),
4830 [NFT_SET_EXT_EXPRESSIONS] = {
4831 .align = __alignof__(struct nft_set_elem_expr),
4833 [NFT_SET_EXT_OBJREF] = {
4834 .len = sizeof(struct nft_object *),
4835 .align = __alignof__(struct nft_object *),
4837 [NFT_SET_EXT_FLAGS] = {
4839 .align = __alignof__(u8),
4841 [NFT_SET_EXT_TIMEOUT] = {
4843 .align = __alignof__(u64),
4845 [NFT_SET_EXT_EXPIRATION] = {
4847 .align = __alignof__(u64),
4849 [NFT_SET_EXT_USERDATA] = {
4850 .len = sizeof(struct nft_userdata),
4851 .align = __alignof__(struct nft_userdata),
4853 [NFT_SET_EXT_KEY_END] = {
4854 .align = __alignof__(u32),
4862 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4863 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
4864 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
4865 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
4866 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
4867 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
4868 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
4869 .len = NFT_USERDATA_MAXLEN },
4870 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
4871 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
4872 .len = NFT_OBJ_MAXNAMELEN - 1 },
4873 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
4874 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
4877 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4878 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
4879 .len = NFT_TABLE_MAXNAMELEN - 1 },
4880 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
4881 .len = NFT_SET_MAXNAMELEN - 1 },
4882 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
4883 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
4886 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4887 const struct nft_set *set,
4888 const struct nft_set_ext *ext)
4890 struct nft_set_elem_expr *elem_expr;
4891 u32 size, num_exprs = 0;
4892 struct nft_expr *expr;
4893 struct nlattr *nest;
4895 elem_expr = nft_set_ext_expr(ext);
4896 nft_setelem_expr_foreach(expr, elem_expr, size)
4899 if (num_exprs == 1) {
4900 expr = nft_setelem_expr_at(elem_expr, 0);
4901 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4905 } else if (num_exprs > 1) {
4906 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4908 goto nla_put_failure;
4910 nft_setelem_expr_foreach(expr, elem_expr, size) {
4911 expr = nft_setelem_expr_at(elem_expr, size);
4912 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4913 goto nla_put_failure;
4915 nla_nest_end(skb, nest);
4923 static int nf_tables_fill_setelem(struct sk_buff *skb,
4924 const struct nft_set *set,
4925 const struct nft_set_elem *elem)
4927 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4928 unsigned char *b = skb_tail_pointer(skb);
4929 struct nlattr *nest;
4931 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4933 goto nla_put_failure;
4935 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
4936 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4937 NFT_DATA_VALUE, set->klen) < 0)
4938 goto nla_put_failure;
4940 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4941 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4942 NFT_DATA_VALUE, set->klen) < 0)
4943 goto nla_put_failure;
4945 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4946 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4947 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4949 goto nla_put_failure;
4951 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4952 nft_set_elem_expr_dump(skb, set, ext))
4953 goto nla_put_failure;
4955 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4956 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4957 (*nft_set_ext_obj(ext))->key.name) < 0)
4958 goto nla_put_failure;
4960 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4961 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4962 htonl(*nft_set_ext_flags(ext))))
4963 goto nla_put_failure;
4965 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4966 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4967 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4969 goto nla_put_failure;
4971 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4972 u64 expires, now = get_jiffies_64();
4974 expires = *nft_set_ext_expiration(ext);
4975 if (time_before64(now, expires))
4980 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4981 nf_jiffies64_to_msecs(expires),
4983 goto nla_put_failure;
4986 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4987 struct nft_userdata *udata;
4989 udata = nft_set_ext_userdata(ext);
4990 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4991 udata->len + 1, udata->data))
4992 goto nla_put_failure;
4995 nla_nest_end(skb, nest);
5003 struct nft_set_dump_args {
5004 const struct netlink_callback *cb;
5005 struct nft_set_iter iter;
5006 struct sk_buff *skb;
5009 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5010 struct nft_set *set,
5011 const struct nft_set_iter *iter,
5012 struct nft_set_elem *elem)
5014 struct nft_set_dump_args *args;
5016 args = container_of(iter, struct nft_set_dump_args, iter);
5017 return nf_tables_fill_setelem(args->skb, set, elem);
5020 struct nft_set_dump_ctx {
5021 const struct nft_set *set;
5025 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5026 const struct nft_set *set)
5028 struct nft_set_elem_catchall *catchall;
5029 u8 genmask = nft_genmask_cur(net);
5030 struct nft_set_elem elem;
5031 struct nft_set_ext *ext;
5034 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5035 ext = nft_set_elem_ext(set, catchall->elem);
5036 if (!nft_set_elem_active(ext, genmask) ||
5037 nft_set_elem_expired(ext))
5040 elem.priv = catchall->elem;
5041 ret = nf_tables_fill_setelem(skb, set, &elem);
5048 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5050 struct nft_set_dump_ctx *dump_ctx = cb->data;
5051 struct net *net = sock_net(skb->sk);
5052 struct nftables_pernet *nft_net;
5053 struct nft_table *table;
5054 struct nft_set *set;
5055 struct nft_set_dump_args args;
5056 bool set_found = false;
5057 struct nlmsghdr *nlh;
5058 struct nlattr *nest;
5063 nft_net = nft_pernet(net);
5064 cb->seq = READ_ONCE(nft_net->base_seq);
5066 list_for_each_entry_rcu(table, &nft_net->tables, list) {
5067 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5068 dump_ctx->ctx.family != table->family)
5071 if (table != dump_ctx->ctx.table)
5074 list_for_each_entry_rcu(set, &table->sets, list) {
5075 if (set == dump_ctx->set) {
5088 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5089 portid = NETLINK_CB(cb->skb).portid;
5090 seq = cb->nlh->nlmsg_seq;
5092 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5093 table->family, NFNETLINK_V0, nft_base_seq(net));
5095 goto nla_put_failure;
5097 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5098 goto nla_put_failure;
5099 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5100 goto nla_put_failure;
5102 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5104 goto nla_put_failure;
5108 args.iter.genmask = nft_genmask_cur(net);
5109 args.iter.skip = cb->args[0];
5110 args.iter.count = 0;
5112 args.iter.fn = nf_tables_dump_setelem;
5113 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5115 if (!args.iter.err && args.iter.count == cb->args[0])
5116 args.iter.err = nft_set_catchall_dump(net, skb, set);
5119 nla_nest_end(skb, nest);
5120 nlmsg_end(skb, nlh);
5122 if (args.iter.err && args.iter.err != -EMSGSIZE)
5123 return args.iter.err;
5124 if (args.iter.count == cb->args[0])
5127 cb->args[0] = args.iter.count;
5135 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5137 struct nft_set_dump_ctx *dump_ctx = cb->data;
5139 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5141 return cb->data ? 0 : -ENOMEM;
5144 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5150 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5151 const struct nft_ctx *ctx, u32 seq,
5152 u32 portid, int event, u16 flags,
5153 const struct nft_set *set,
5154 const struct nft_set_elem *elem)
5156 struct nlmsghdr *nlh;
5157 struct nlattr *nest;
5160 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5161 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5162 NFNETLINK_V0, nft_base_seq(ctx->net));
5164 goto nla_put_failure;
5166 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5167 goto nla_put_failure;
5168 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5169 goto nla_put_failure;
5171 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5173 goto nla_put_failure;
5175 err = nf_tables_fill_setelem(skb, set, elem);
5177 goto nla_put_failure;
5179 nla_nest_end(skb, nest);
5181 nlmsg_end(skb, nlh);
5185 nlmsg_trim(skb, nlh);
5189 static int nft_setelem_parse_flags(const struct nft_set *set,
5190 const struct nlattr *attr, u32 *flags)
5195 *flags = ntohl(nla_get_be32(attr));
5196 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5198 if (!(set->flags & NFT_SET_INTERVAL) &&
5199 *flags & NFT_SET_ELEM_INTERVAL_END)
5201 if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5202 (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5208 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5209 struct nft_data *key, struct nlattr *attr)
5211 struct nft_data_desc desc = {
5212 .type = NFT_DATA_VALUE,
5213 .size = NFT_DATA_VALUE_MAXLEN,
5217 return nft_data_init(ctx, key, &desc, attr);
5220 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5221 struct nft_data_desc *desc,
5222 struct nft_data *data,
5223 struct nlattr *attr)
5227 if (set->dtype == NFT_DATA_VERDICT)
5228 dtype = NFT_DATA_VERDICT;
5230 dtype = NFT_DATA_VALUE;
5233 desc->size = NFT_DATA_VALUE_MAXLEN;
5234 desc->len = set->dlen;
5235 desc->flags = NFT_DATA_DESC_SETELEM;
5237 return nft_data_init(ctx, data, desc, attr);
5240 static void *nft_setelem_catchall_get(const struct net *net,
5241 const struct nft_set *set)
5243 struct nft_set_elem_catchall *catchall;
5244 u8 genmask = nft_genmask_cur(net);
5245 struct nft_set_ext *ext;
5248 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5249 ext = nft_set_elem_ext(set, catchall->elem);
5250 if (!nft_set_elem_active(ext, genmask) ||
5251 nft_set_elem_expired(ext))
5254 priv = catchall->elem;
5261 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5262 struct nft_set_elem *elem, u32 flags)
5266 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5267 priv = set->ops->get(ctx->net, set, elem, flags);
5269 return PTR_ERR(priv);
5271 priv = nft_setelem_catchall_get(ctx->net, set);
5280 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5281 const struct nlattr *attr)
5283 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5284 struct nft_set_elem elem;
5285 struct sk_buff *skb;
5289 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5290 nft_set_elem_policy, NULL);
5294 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5298 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5301 if (nla[NFTA_SET_ELEM_KEY]) {
5302 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5303 nla[NFTA_SET_ELEM_KEY]);
5308 if (nla[NFTA_SET_ELEM_KEY_END]) {
5309 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5310 nla[NFTA_SET_ELEM_KEY_END]);
5315 err = nft_setelem_get(ctx, set, &elem, flags);
5320 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5324 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5325 NFT_MSG_NEWSETELEM, 0, set, &elem);
5327 goto err_fill_setelem;
5329 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5336 /* called with rcu_read_lock held */
5337 static int nf_tables_getsetelem(struct sk_buff *skb,
5338 const struct nfnl_info *info,
5339 const struct nlattr * const nla[])
5341 struct netlink_ext_ack *extack = info->extack;
5342 u8 genmask = nft_genmask_cur(info->net);
5343 u8 family = info->nfmsg->nfgen_family;
5344 struct net *net = info->net;
5345 struct nft_table *table;
5346 struct nft_set *set;
5347 struct nlattr *attr;
5351 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5352 genmask, NETLINK_CB(skb).portid);
5353 if (IS_ERR(table)) {
5354 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5355 return PTR_ERR(table);
5358 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5360 return PTR_ERR(set);
5362 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5364 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5365 struct netlink_dump_control c = {
5366 .start = nf_tables_dump_set_start,
5367 .dump = nf_tables_dump_set,
5368 .done = nf_tables_dump_set_done,
5369 .module = THIS_MODULE,
5371 struct nft_set_dump_ctx dump_ctx = {
5377 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5380 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5383 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5384 err = nft_get_set_elem(&ctx, set, attr);
5386 NL_SET_BAD_ATTR(extack, attr);
5394 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5395 const struct nft_set *set,
5396 const struct nft_set_elem *elem,
5399 struct nftables_pernet *nft_net;
5400 struct net *net = ctx->net;
5401 u32 portid = ctx->portid;
5402 struct sk_buff *skb;
5406 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5409 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5413 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5414 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5416 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5423 nft_net = nft_pernet(net);
5424 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5427 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5430 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5432 struct nft_set *set)
5434 struct nft_trans *trans;
5436 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5440 nft_trans_elem_set(trans) = set;
5444 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5445 const struct nft_set *set,
5446 const struct nlattr *attr)
5448 struct nft_expr *expr;
5451 expr = nft_expr_init(ctx, attr);
5456 if (expr->ops->type->flags & NFT_EXPR_GC) {
5457 if (set->flags & NFT_SET_TIMEOUT)
5458 goto err_set_elem_expr;
5459 if (!set->ops->gc_init)
5460 goto err_set_elem_expr;
5461 set->ops->gc_init(set);
5467 nft_expr_destroy(ctx, expr);
5468 return ERR_PTR(err);
5471 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
5473 len += nft_set_ext_types[id].len;
5474 if (len > tmpl->ext_len[id] ||
5481 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
5482 void *to, const void *from, u32 len)
5484 if (nft_set_ext_check(tmpl, id, len) < 0)
5487 memcpy(to, from, len);
5492 void *nft_set_elem_init(const struct nft_set *set,
5493 const struct nft_set_ext_tmpl *tmpl,
5494 const u32 *key, const u32 *key_end,
5495 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5497 struct nft_set_ext *ext;
5500 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5502 return ERR_PTR(-ENOMEM);
5504 ext = nft_set_elem_ext(set, elem);
5505 nft_set_ext_init(ext, tmpl);
5507 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5508 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
5509 nft_set_ext_key(ext), key, set->klen) < 0)
5512 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5513 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
5514 nft_set_ext_key_end(ext), key_end, set->klen) < 0)
5517 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5518 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
5519 nft_set_ext_data(ext), data, set->dlen) < 0)
5522 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5523 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5524 if (expiration == 0)
5525 *nft_set_ext_expiration(ext) += timeout;
5527 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5528 *nft_set_ext_timeout(ext) = timeout;
5535 return ERR_PTR(-EINVAL);
5538 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5539 struct nft_expr *expr)
5541 if (expr->ops->destroy_clone) {
5542 expr->ops->destroy_clone(ctx, expr);
5543 module_put(expr->ops->type->owner);
5545 nf_tables_expr_destroy(ctx, expr);
5549 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5550 struct nft_set_elem_expr *elem_expr)
5552 struct nft_expr *expr;
5555 nft_setelem_expr_foreach(expr, elem_expr, size)
5556 __nft_set_elem_expr_destroy(ctx, expr);
5559 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5562 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5563 struct nft_ctx ctx = {
5564 .net = read_pnet(&set->net),
5565 .family = set->table->family,
5568 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5569 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5570 nft_data_release(nft_set_ext_data(ext), set->dtype);
5571 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5572 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5574 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5575 (*nft_set_ext_obj(ext))->use--;
5578 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5580 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5581 * with the refcounting from the preparation phase.
5583 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5584 const struct nft_set *set, void *elem)
5586 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5588 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5589 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5594 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5595 struct nft_expr *expr_array[])
5597 struct nft_expr *expr;
5600 for (i = 0; i < set->num_exprs; i++) {
5601 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
5605 err = nft_expr_clone(expr, set->exprs[i]);
5610 expr_array[i] = expr;
5616 for (k = i - 1; k >= 0; k--)
5617 nft_expr_destroy(ctx, expr_array[k]);
5622 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5623 const struct nft_set_ext_tmpl *tmpl,
5624 const struct nft_set_ext *ext,
5625 struct nft_expr *expr_array[],
5628 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5629 u32 len = sizeof(struct nft_set_elem_expr);
5630 struct nft_expr *expr;
5636 for (i = 0; i < num_exprs; i++)
5637 len += expr_array[i]->ops->size;
5639 if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
5642 for (i = 0; i < num_exprs; i++) {
5643 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5644 err = nft_expr_clone(expr, expr_array[i]);
5646 goto err_elem_expr_setup;
5648 elem_expr->size += expr_array[i]->ops->size;
5649 nft_expr_destroy(ctx, expr_array[i]);
5650 expr_array[i] = NULL;
5655 err_elem_expr_setup:
5656 for (; i < num_exprs; i++) {
5657 nft_expr_destroy(ctx, expr_array[i]);
5658 expr_array[i] = NULL;
5664 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5665 const struct nft_set *set)
5667 struct nft_set_elem_catchall *catchall;
5668 u8 genmask = nft_genmask_cur(net);
5669 struct nft_set_ext *ext;
5671 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5672 ext = nft_set_elem_ext(set, catchall->elem);
5673 if (nft_set_elem_active(ext, genmask) &&
5674 !nft_set_elem_expired(ext))
5680 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5682 void *nft_set_catchall_gc(const struct nft_set *set)
5684 struct nft_set_elem_catchall *catchall, *next;
5685 struct nft_set_ext *ext;
5688 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5689 ext = nft_set_elem_ext(set, catchall->elem);
5691 if (!nft_set_elem_expired(ext) ||
5692 nft_set_elem_mark_busy(ext))
5695 elem = catchall->elem;
5696 list_del_rcu(&catchall->list);
5697 kfree_rcu(catchall, rcu);
5703 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5705 static int nft_setelem_catchall_insert(const struct net *net,
5706 struct nft_set *set,
5707 const struct nft_set_elem *elem,
5708 struct nft_set_ext **pext)
5710 struct nft_set_elem_catchall *catchall;
5711 u8 genmask = nft_genmask_next(net);
5712 struct nft_set_ext *ext;
5714 list_for_each_entry(catchall, &set->catchall_list, list) {
5715 ext = nft_set_elem_ext(set, catchall->elem);
5716 if (nft_set_elem_active(ext, genmask)) {
5722 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5726 catchall->elem = elem->priv;
5727 list_add_tail_rcu(&catchall->list, &set->catchall_list);
5732 static int nft_setelem_insert(const struct net *net,
5733 struct nft_set *set,
5734 const struct nft_set_elem *elem,
5735 struct nft_set_ext **ext, unsigned int flags)
5739 if (flags & NFT_SET_ELEM_CATCHALL)
5740 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5742 ret = set->ops->insert(net, set, elem, ext);
5747 static bool nft_setelem_is_catchall(const struct nft_set *set,
5748 const struct nft_set_elem *elem)
5750 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5752 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5753 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5759 static void nft_setelem_activate(struct net *net, struct nft_set *set,
5760 struct nft_set_elem *elem)
5762 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5764 if (nft_setelem_is_catchall(set, elem)) {
5765 nft_set_elem_change_active(net, set, ext);
5766 nft_set_elem_clear_busy(ext);
5768 set->ops->activate(net, set, elem);
5772 static int nft_setelem_catchall_deactivate(const struct net *net,
5773 struct nft_set *set,
5774 struct nft_set_elem *elem)
5776 struct nft_set_elem_catchall *catchall;
5777 struct nft_set_ext *ext;
5779 list_for_each_entry(catchall, &set->catchall_list, list) {
5780 ext = nft_set_elem_ext(set, catchall->elem);
5781 if (!nft_is_active(net, ext) ||
5782 nft_set_elem_mark_busy(ext))
5786 elem->priv = catchall->elem;
5787 nft_set_elem_change_active(net, set, ext);
5794 static int __nft_setelem_deactivate(const struct net *net,
5795 struct nft_set *set,
5796 struct nft_set_elem *elem)
5800 priv = set->ops->deactivate(net, set, elem);
5811 static int nft_setelem_deactivate(const struct net *net,
5812 struct nft_set *set,
5813 struct nft_set_elem *elem, u32 flags)
5817 if (flags & NFT_SET_ELEM_CATCHALL)
5818 ret = nft_setelem_catchall_deactivate(net, set, elem);
5820 ret = __nft_setelem_deactivate(net, set, elem);
5825 static void nft_setelem_catchall_remove(const struct net *net,
5826 const struct nft_set *set,
5827 const struct nft_set_elem *elem)
5829 struct nft_set_elem_catchall *catchall, *next;
5831 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5832 if (catchall->elem == elem->priv) {
5833 list_del_rcu(&catchall->list);
5834 kfree_rcu(catchall, rcu);
5840 static void nft_setelem_remove(const struct net *net,
5841 const struct nft_set *set,
5842 const struct nft_set_elem *elem)
5844 if (nft_setelem_is_catchall(set, elem))
5845 nft_setelem_catchall_remove(net, set, elem);
5847 set->ops->remove(net, set, elem);
5850 static bool nft_setelem_valid_key_end(const struct nft_set *set,
5851 struct nlattr **nla, u32 flags)
5853 if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
5854 (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
5855 if (flags & NFT_SET_ELEM_INTERVAL_END)
5857 if (!nla[NFTA_SET_ELEM_KEY_END] &&
5858 !(flags & NFT_SET_ELEM_CATCHALL))
5861 if (nla[NFTA_SET_ELEM_KEY_END])
5868 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5869 const struct nlattr *attr, u32 nlmsg_flags)
5871 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5872 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5873 u8 genmask = nft_genmask_next(ctx->net);
5874 u32 flags = 0, size = 0, num_exprs = 0;
5875 struct nft_set_ext_tmpl tmpl;
5876 struct nft_set_ext *ext, *ext2;
5877 struct nft_set_elem elem;
5878 struct nft_set_binding *binding;
5879 struct nft_object *obj = NULL;
5880 struct nft_userdata *udata;
5881 struct nft_data_desc desc;
5882 enum nft_registers dreg;
5883 struct nft_trans *trans;
5889 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5890 nft_set_elem_policy, NULL);
5894 nft_set_ext_prepare(&tmpl);
5896 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5900 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5904 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5909 if (set->flags & NFT_SET_MAP) {
5910 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5911 !(flags & NFT_SET_ELEM_INTERVAL_END))
5914 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5918 if (set->flags & NFT_SET_OBJECT) {
5919 if (!nla[NFTA_SET_ELEM_OBJREF] &&
5920 !(flags & NFT_SET_ELEM_INTERVAL_END))
5923 if (nla[NFTA_SET_ELEM_OBJREF])
5927 if (!nft_setelem_valid_key_end(set, nla, flags))
5930 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5931 (nla[NFTA_SET_ELEM_DATA] ||
5932 nla[NFTA_SET_ELEM_OBJREF] ||
5933 nla[NFTA_SET_ELEM_TIMEOUT] ||
5934 nla[NFTA_SET_ELEM_EXPIRATION] ||
5935 nla[NFTA_SET_ELEM_USERDATA] ||
5936 nla[NFTA_SET_ELEM_EXPR] ||
5937 nla[NFTA_SET_ELEM_KEY_END] ||
5938 nla[NFTA_SET_ELEM_EXPRESSIONS]))
5942 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5943 if (!(set->flags & NFT_SET_TIMEOUT))
5945 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5949 } else if (set->flags & NFT_SET_TIMEOUT) {
5950 timeout = set->timeout;
5954 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5955 if (!(set->flags & NFT_SET_TIMEOUT))
5957 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5963 if (nla[NFTA_SET_ELEM_EXPR]) {
5964 struct nft_expr *expr;
5966 if (set->num_exprs && set->num_exprs != 1)
5969 expr = nft_set_elem_expr_alloc(ctx, set,
5970 nla[NFTA_SET_ELEM_EXPR]);
5972 return PTR_ERR(expr);
5974 expr_array[0] = expr;
5977 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
5979 goto err_set_elem_expr;
5981 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5982 struct nft_expr *expr;
5987 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
5988 if (i == NFT_SET_EXPR_MAX ||
5989 (set->num_exprs && set->num_exprs == i)) {
5991 goto err_set_elem_expr;
5993 if (nla_type(tmp) != NFTA_LIST_ELEM) {
5995 goto err_set_elem_expr;
5997 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5999 err = PTR_ERR(expr);
6000 goto err_set_elem_expr;
6002 expr_array[i] = expr;
6005 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6007 goto err_set_elem_expr;
6011 if (set->num_exprs && set->num_exprs != i) {
6013 goto err_set_elem_expr;
6015 } else if (set->num_exprs > 0) {
6016 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6018 goto err_set_elem_expr_clone;
6020 num_exprs = set->num_exprs;
6023 if (nla[NFTA_SET_ELEM_KEY]) {
6024 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6025 nla[NFTA_SET_ELEM_KEY]);
6027 goto err_set_elem_expr;
6029 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6034 if (nla[NFTA_SET_ELEM_KEY_END]) {
6035 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6036 nla[NFTA_SET_ELEM_KEY_END]);
6040 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6042 goto err_parse_key_end;
6046 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6048 goto err_parse_key_end;
6050 if (timeout != set->timeout) {
6051 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6053 goto err_parse_key_end;
6058 for (i = 0; i < num_exprs; i++)
6059 size += expr_array[i]->ops->size;
6061 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6062 sizeof(struct nft_set_elem_expr) + size);
6064 goto err_parse_key_end;
6067 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6068 obj = nft_obj_lookup(ctx->net, ctx->table,
6069 nla[NFTA_SET_ELEM_OBJREF],
6070 set->objtype, genmask);
6073 goto err_parse_key_end;
6075 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6077 goto err_parse_key_end;
6080 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6081 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6082 nla[NFTA_SET_ELEM_DATA]);
6084 goto err_parse_key_end;
6086 dreg = nft_type_to_reg(set->dtype);
6087 list_for_each_entry(binding, &set->bindings, list) {
6088 struct nft_ctx bind_ctx = {
6090 .family = ctx->family,
6091 .table = ctx->table,
6092 .chain = (struct nft_chain *)binding->chain,
6095 if (!(binding->flags & NFT_SET_MAP))
6098 err = nft_validate_register_store(&bind_ctx, dreg,
6100 desc.type, desc.len);
6102 goto err_parse_data;
6104 if (desc.type == NFT_DATA_VERDICT &&
6105 (elem.data.val.verdict.code == NFT_GOTO ||
6106 elem.data.val.verdict.code == NFT_JUMP))
6107 nft_validate_state_update(ctx->net,
6111 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6113 goto err_parse_data;
6116 /* The full maximum length of userdata can exceed the maximum
6117 * offset value (U8_MAX) for following extensions, therefor it
6118 * must be the last extension added.
6121 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6122 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6124 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6127 goto err_parse_data;
6131 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6132 elem.key_end.val.data, elem.data.val.data,
6133 timeout, expiration, GFP_KERNEL_ACCOUNT);
6134 if (IS_ERR(elem.priv)) {
6135 err = PTR_ERR(elem.priv);
6136 goto err_parse_data;
6139 ext = nft_set_elem_ext(set, elem.priv);
6141 *nft_set_ext_flags(ext) = flags;
6144 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6146 goto err_elem_userdata;
6148 udata = nft_set_ext_userdata(ext);
6149 udata->len = ulen - 1;
6150 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6153 *nft_set_ext_obj(ext) = obj;
6156 err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6160 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6161 if (trans == NULL) {
6166 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6168 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6170 if (err == -EEXIST) {
6171 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6172 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6173 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6174 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6175 goto err_element_clash;
6176 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6177 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6178 memcmp(nft_set_ext_data(ext),
6179 nft_set_ext_data(ext2), set->dlen) != 0) ||
6180 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6181 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6182 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6183 goto err_element_clash;
6184 else if (!(nlmsg_flags & NLM_F_EXCL))
6186 } else if (err == -ENOTEMPTY) {
6187 /* ENOTEMPTY reports overlapping between this element
6188 * and an existing one.
6192 goto err_element_clash;
6195 if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6196 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6201 nft_trans_elem(trans) = elem;
6202 nft_trans_commit_list_add_tail(ctx->net, trans);
6206 nft_setelem_remove(ctx->net, set, &elem);
6213 nf_tables_set_elem_destroy(ctx, set, elem.priv);
6215 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6216 nft_data_release(&elem.data.val, desc.type);
6218 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6220 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6222 for (i = 0; i < num_exprs && expr_array[i]; i++)
6223 nft_expr_destroy(ctx, expr_array[i]);
6224 err_set_elem_expr_clone:
6228 static int nf_tables_newsetelem(struct sk_buff *skb,
6229 const struct nfnl_info *info,
6230 const struct nlattr * const nla[])
6232 struct nftables_pernet *nft_net = nft_pernet(info->net);
6233 struct netlink_ext_ack *extack = info->extack;
6234 u8 genmask = nft_genmask_next(info->net);
6235 u8 family = info->nfmsg->nfgen_family;
6236 struct net *net = info->net;
6237 const struct nlattr *attr;
6238 struct nft_table *table;
6239 struct nft_set *set;
6243 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6246 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6247 genmask, NETLINK_CB(skb).portid);
6248 if (IS_ERR(table)) {
6249 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6250 return PTR_ERR(table);
6253 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6254 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6256 return PTR_ERR(set);
6258 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6261 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6263 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6264 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6266 NL_SET_BAD_ATTR(extack, attr);
6271 if (nft_net->validate_state == NFT_VALIDATE_DO)
6272 return nft_table_validate(net, table);
6278 * nft_data_hold - hold a nft_data item
6280 * @data: struct nft_data to release
6281 * @type: type of data
6283 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6284 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6285 * NFT_GOTO verdicts. This function must be called on active data objects
6286 * from the second phase of the commit protocol.
6288 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6290 struct nft_chain *chain;
6291 struct nft_rule *rule;
6293 if (type == NFT_DATA_VERDICT) {
6294 switch (data->verdict.code) {
6297 chain = data->verdict.chain;
6300 if (!nft_chain_is_bound(chain))
6303 chain->table->use++;
6304 list_for_each_entry(rule, &chain->rules, list)
6307 nft_chain_add(chain->table, chain);
6313 static void nft_setelem_data_activate(const struct net *net,
6314 const struct nft_set *set,
6315 struct nft_set_elem *elem)
6317 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6319 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6320 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6321 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6322 (*nft_set_ext_obj(ext))->use++;
6325 static void nft_setelem_data_deactivate(const struct net *net,
6326 const struct nft_set *set,
6327 struct nft_set_elem *elem)
6329 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6331 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6332 nft_data_release(nft_set_ext_data(ext), set->dtype);
6333 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6334 (*nft_set_ext_obj(ext))->use--;
6337 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6338 const struct nlattr *attr)
6340 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6341 struct nft_set_ext_tmpl tmpl;
6342 struct nft_set_elem elem;
6343 struct nft_set_ext *ext;
6344 struct nft_trans *trans;
6348 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6349 nft_set_elem_policy, NULL);
6353 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6357 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6360 if (!nft_setelem_valid_key_end(set, nla, flags))
6363 nft_set_ext_prepare(&tmpl);
6366 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6371 if (nla[NFTA_SET_ELEM_KEY]) {
6372 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6373 nla[NFTA_SET_ELEM_KEY]);
6377 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6382 if (nla[NFTA_SET_ELEM_KEY_END]) {
6383 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6384 nla[NFTA_SET_ELEM_KEY_END]);
6388 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6390 goto fail_elem_key_end;
6394 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6395 elem.key_end.val.data, NULL, 0, 0,
6396 GFP_KERNEL_ACCOUNT);
6397 if (IS_ERR(elem.priv)) {
6398 err = PTR_ERR(elem.priv);
6399 goto fail_elem_key_end;
6402 ext = nft_set_elem_ext(set, elem.priv);
6404 *nft_set_ext_flags(ext) = flags;
6406 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6410 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6414 nft_setelem_data_deactivate(ctx->net, set, &elem);
6416 nft_trans_elem(trans) = elem;
6417 nft_trans_commit_list_add_tail(ctx->net, trans);
6425 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6427 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6431 static int nft_setelem_flush(const struct nft_ctx *ctx,
6432 struct nft_set *set,
6433 const struct nft_set_iter *iter,
6434 struct nft_set_elem *elem)
6436 struct nft_trans *trans;
6439 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6440 sizeof(struct nft_trans_elem), GFP_ATOMIC);
6444 if (!set->ops->flush(ctx->net, set, elem->priv)) {
6450 nft_setelem_data_deactivate(ctx->net, set, elem);
6451 nft_trans_elem_set(trans) = set;
6452 nft_trans_elem(trans) = *elem;
6453 nft_trans_commit_list_add_tail(ctx->net, trans);
6461 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6462 struct nft_set *set,
6463 struct nft_set_elem *elem)
6465 struct nft_trans *trans;
6467 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6468 sizeof(struct nft_trans_elem), GFP_KERNEL);
6472 nft_setelem_data_deactivate(ctx->net, set, elem);
6473 nft_trans_elem_set(trans) = set;
6474 nft_trans_elem(trans) = *elem;
6475 nft_trans_commit_list_add_tail(ctx->net, trans);
6480 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6481 struct nft_set *set)
6483 u8 genmask = nft_genmask_next(ctx->net);
6484 struct nft_set_elem_catchall *catchall;
6485 struct nft_set_elem elem;
6486 struct nft_set_ext *ext;
6489 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6490 ext = nft_set_elem_ext(set, catchall->elem);
6491 if (!nft_set_elem_active(ext, genmask) ||
6492 nft_set_elem_mark_busy(ext))
6495 elem.priv = catchall->elem;
6496 ret = __nft_set_catchall_flush(ctx, set, &elem);
6504 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6506 struct nft_set_iter iter = {
6508 .fn = nft_setelem_flush,
6511 set->ops->walk(ctx, set, &iter);
6513 iter.err = nft_set_catchall_flush(ctx, set);
6518 static int nf_tables_delsetelem(struct sk_buff *skb,
6519 const struct nfnl_info *info,
6520 const struct nlattr * const nla[])
6522 struct netlink_ext_ack *extack = info->extack;
6523 u8 genmask = nft_genmask_next(info->net);
6524 u8 family = info->nfmsg->nfgen_family;
6525 struct net *net = info->net;
6526 const struct nlattr *attr;
6527 struct nft_table *table;
6528 struct nft_set *set;
6532 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6533 genmask, NETLINK_CB(skb).portid);
6534 if (IS_ERR(table)) {
6535 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6536 return PTR_ERR(table);
6539 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6541 return PTR_ERR(set);
6542 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6545 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6547 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6548 return nft_set_flush(&ctx, set, genmask);
6550 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6551 err = nft_del_setelem(&ctx, set, attr);
6553 NL_SET_BAD_ATTR(extack, attr);
6560 void nft_set_gc_batch_release(struct rcu_head *rcu)
6562 struct nft_set_gc_batch *gcb;
6565 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6566 for (i = 0; i < gcb->head.cnt; i++)
6567 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6571 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6574 struct nft_set_gc_batch *gcb;
6576 gcb = kzalloc(sizeof(*gcb), gfp);
6579 gcb->head.set = set;
6588 * nft_register_obj- register nf_tables stateful object type
6589 * @obj_type: object type
6591 * Registers the object type for use with nf_tables. Returns zero on
6592 * success or a negative errno code otherwise.
6594 int nft_register_obj(struct nft_object_type *obj_type)
6596 if (obj_type->type == NFT_OBJECT_UNSPEC)
6599 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6600 list_add_rcu(&obj_type->list, &nf_tables_objects);
6601 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6604 EXPORT_SYMBOL_GPL(nft_register_obj);
6607 * nft_unregister_obj - unregister nf_tables object type
6608 * @obj_type: object type
6610 * Unregisters the object type for use with nf_tables.
6612 void nft_unregister_obj(struct nft_object_type *obj_type)
6614 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6615 list_del_rcu(&obj_type->list);
6616 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6618 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6620 struct nft_object *nft_obj_lookup(const struct net *net,
6621 const struct nft_table *table,
6622 const struct nlattr *nla, u32 objtype,
6625 struct nft_object_hash_key k = { .table = table };
6626 char search[NFT_OBJ_MAXNAMELEN];
6627 struct rhlist_head *tmp, *list;
6628 struct nft_object *obj;
6630 nla_strscpy(search, nla, sizeof(search));
6633 WARN_ON_ONCE(!rcu_read_lock_held() &&
6634 !lockdep_commit_lock_is_held(net));
6637 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6641 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6642 if (objtype == obj->ops->type->type &&
6643 nft_active_genmask(obj, genmask)) {
6650 return ERR_PTR(-ENOENT);
6652 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6654 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6655 const struct nlattr *nla,
6656 u32 objtype, u8 genmask)
6658 struct nft_object *obj;
6660 list_for_each_entry(obj, &table->objects, list) {
6661 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6662 objtype == obj->ops->type->type &&
6663 nft_active_genmask(obj, genmask))
6666 return ERR_PTR(-ENOENT);
6669 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6670 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
6671 .len = NFT_TABLE_MAXNAMELEN - 1 },
6672 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
6673 .len = NFT_OBJ_MAXNAMELEN - 1 },
6674 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
6675 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
6676 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
6677 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
6678 .len = NFT_USERDATA_MAXLEN },
6681 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6682 const struct nft_object_type *type,
6683 const struct nlattr *attr)
6686 const struct nft_object_ops *ops;
6687 struct nft_object *obj;
6690 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6695 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6696 type->policy, NULL);
6700 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6703 if (type->select_ops) {
6704 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6714 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
6718 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6731 return ERR_PTR(err);
6734 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6735 struct nft_object *obj, bool reset)
6737 struct nlattr *nest;
6739 nest = nla_nest_start_noflag(skb, attr);
6741 goto nla_put_failure;
6742 if (obj->ops->dump(skb, obj, reset) < 0)
6743 goto nla_put_failure;
6744 nla_nest_end(skb, nest);
6751 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6753 const struct nft_object_type *type;
6755 list_for_each_entry(type, &nf_tables_objects, list) {
6756 if (objtype == type->type)
6762 static const struct nft_object_type *
6763 nft_obj_type_get(struct net *net, u32 objtype)
6765 const struct nft_object_type *type;
6767 type = __nft_obj_type_get(objtype);
6768 if (type != NULL && try_module_get(type->owner))
6771 lockdep_nfnl_nft_mutex_not_held();
6772 #ifdef CONFIG_MODULES
6774 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6775 return ERR_PTR(-EAGAIN);
6778 return ERR_PTR(-ENOENT);
6781 static int nf_tables_updobj(const struct nft_ctx *ctx,
6782 const struct nft_object_type *type,
6783 const struct nlattr *attr,
6784 struct nft_object *obj)
6786 struct nft_object *newobj;
6787 struct nft_trans *trans;
6790 if (!try_module_get(type->owner))
6793 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6794 sizeof(struct nft_trans_obj));
6798 newobj = nft_obj_init(ctx, type, attr);
6799 if (IS_ERR(newobj)) {
6800 err = PTR_ERR(newobj);
6801 goto err_free_trans;
6804 nft_trans_obj(trans) = obj;
6805 nft_trans_obj_update(trans) = true;
6806 nft_trans_obj_newobj(trans) = newobj;
6807 nft_trans_commit_list_add_tail(ctx->net, trans);
6814 module_put(type->owner);
6818 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
6819 const struct nlattr * const nla[])
6821 struct netlink_ext_ack *extack = info->extack;
6822 u8 genmask = nft_genmask_next(info->net);
6823 u8 family = info->nfmsg->nfgen_family;
6824 const struct nft_object_type *type;
6825 struct net *net = info->net;
6826 struct nft_table *table;
6827 struct nft_object *obj;
6832 if (!nla[NFTA_OBJ_TYPE] ||
6833 !nla[NFTA_OBJ_NAME] ||
6834 !nla[NFTA_OBJ_DATA])
6837 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6838 NETLINK_CB(skb).portid);
6839 if (IS_ERR(table)) {
6840 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6841 return PTR_ERR(table);
6844 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6845 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6848 if (err != -ENOENT) {
6849 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6853 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
6854 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6857 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
6860 type = __nft_obj_type_get(objtype);
6861 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6863 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6866 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6868 type = nft_obj_type_get(net, objtype);
6870 return PTR_ERR(type);
6872 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6877 obj->key.table = table;
6878 obj->handle = nf_tables_alloc_handle(table);
6880 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
6881 if (!obj->key.name) {
6886 if (nla[NFTA_OBJ_USERDATA]) {
6887 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6888 if (obj->udata == NULL)
6891 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6894 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6898 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6899 nft_objname_ht_params);
6903 list_add_tail_rcu(&obj->list, &table->objects);
6907 /* queued in transaction log */
6908 INIT_LIST_HEAD(&obj->list);
6913 kfree(obj->key.name);
6915 if (obj->ops->destroy)
6916 obj->ops->destroy(&ctx, obj);
6919 module_put(type->owner);
6923 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6924 u32 portid, u32 seq, int event, u32 flags,
6925 int family, const struct nft_table *table,
6926 struct nft_object *obj, bool reset)
6928 struct nlmsghdr *nlh;
6930 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6931 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
6932 NFNETLINK_V0, nft_base_seq(net));
6934 goto nla_put_failure;
6936 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6937 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6938 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6939 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6940 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6941 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6943 goto nla_put_failure;
6946 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6947 goto nla_put_failure;
6949 nlmsg_end(skb, nlh);
6953 nlmsg_trim(skb, nlh);
6957 struct nft_obj_filter {
6962 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6964 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6965 const struct nft_table *table;
6966 unsigned int idx = 0, s_idx = cb->args[0];
6967 struct nft_obj_filter *filter = cb->data;
6968 struct net *net = sock_net(skb->sk);
6969 int family = nfmsg->nfgen_family;
6970 struct nftables_pernet *nft_net;
6971 struct nft_object *obj;
6974 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6978 nft_net = nft_pernet(net);
6979 cb->seq = READ_ONCE(nft_net->base_seq);
6981 list_for_each_entry_rcu(table, &nft_net->tables, list) {
6982 if (family != NFPROTO_UNSPEC && family != table->family)
6985 list_for_each_entry_rcu(obj, &table->objects, list) {
6986 if (!nft_is_active(net, obj))
6991 memset(&cb->args[1], 0,
6992 sizeof(cb->args) - sizeof(cb->args[0]));
6993 if (filter && filter->table &&
6994 strcmp(filter->table, table->name))
6997 filter->type != NFT_OBJECT_UNSPEC &&
6998 obj->ops->type->type != filter->type)
7001 char *buf = kasprintf(GFP_ATOMIC,
7006 audit_log_nfcfg(buf,
7009 AUDIT_NFT_OP_OBJ_RESET,
7014 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7017 NLM_F_MULTI | NLM_F_APPEND,
7018 table->family, table,
7022 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7034 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7036 const struct nlattr * const *nla = cb->data;
7037 struct nft_obj_filter *filter = NULL;
7039 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7040 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7044 if (nla[NFTA_OBJ_TABLE]) {
7045 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7046 if (!filter->table) {
7052 if (nla[NFTA_OBJ_TYPE])
7053 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7060 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7062 struct nft_obj_filter *filter = cb->data;
7065 kfree(filter->table);
7072 /* called with rcu_read_lock held */
7073 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7074 const struct nlattr * const nla[])
7076 struct netlink_ext_ack *extack = info->extack;
7077 u8 genmask = nft_genmask_cur(info->net);
7078 u8 family = info->nfmsg->nfgen_family;
7079 const struct nft_table *table;
7080 struct net *net = info->net;
7081 struct nft_object *obj;
7082 struct sk_buff *skb2;
7087 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7088 struct netlink_dump_control c = {
7089 .start = nf_tables_dump_obj_start,
7090 .dump = nf_tables_dump_obj,
7091 .done = nf_tables_dump_obj_done,
7092 .module = THIS_MODULE,
7093 .data = (void *)nla,
7096 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7099 if (!nla[NFTA_OBJ_NAME] ||
7100 !nla[NFTA_OBJ_TYPE])
7103 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7104 if (IS_ERR(table)) {
7105 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7106 return PTR_ERR(table);
7109 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7110 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7112 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7113 return PTR_ERR(obj);
7116 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7120 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7124 const struct nftables_pernet *nft_net;
7127 nft_net = nft_pernet(net);
7128 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7130 audit_log_nfcfg(buf,
7133 AUDIT_NFT_OP_OBJ_RESET,
7138 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7139 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7140 family, table, obj, reset);
7142 goto err_fill_obj_info;
7144 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7151 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7153 if (obj->ops->destroy)
7154 obj->ops->destroy(ctx, obj);
7156 module_put(obj->ops->type->owner);
7157 kfree(obj->key.name);
7162 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7163 const struct nlattr * const nla[])
7165 struct netlink_ext_ack *extack = info->extack;
7166 u8 genmask = nft_genmask_next(info->net);
7167 u8 family = info->nfmsg->nfgen_family;
7168 struct net *net = info->net;
7169 const struct nlattr *attr;
7170 struct nft_table *table;
7171 struct nft_object *obj;
7175 if (!nla[NFTA_OBJ_TYPE] ||
7176 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7179 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7180 NETLINK_CB(skb).portid);
7181 if (IS_ERR(table)) {
7182 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7183 return PTR_ERR(table);
7186 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7187 if (nla[NFTA_OBJ_HANDLE]) {
7188 attr = nla[NFTA_OBJ_HANDLE];
7189 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7191 attr = nla[NFTA_OBJ_NAME];
7192 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7196 NL_SET_BAD_ATTR(extack, attr);
7197 return PTR_ERR(obj);
7200 NL_SET_BAD_ATTR(extack, attr);
7204 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7206 return nft_delobj(&ctx, obj);
7209 void nft_obj_notify(struct net *net, const struct nft_table *table,
7210 struct nft_object *obj, u32 portid, u32 seq, int event,
7211 u16 flags, int family, int report, gfp_t gfp)
7213 struct nftables_pernet *nft_net = nft_pernet(net);
7214 struct sk_buff *skb;
7216 char *buf = kasprintf(gfp, "%s:%u",
7217 table->name, nft_net->base_seq);
7219 audit_log_nfcfg(buf,
7222 event == NFT_MSG_NEWOBJ ?
7223 AUDIT_NFT_OP_OBJ_REGISTER :
7224 AUDIT_NFT_OP_OBJ_UNREGISTER,
7229 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7232 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7236 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7237 flags & (NLM_F_CREATE | NLM_F_EXCL),
7238 family, table, obj, false);
7244 nft_notify_enqueue(skb, report, &nft_net->notify_list);
7247 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7249 EXPORT_SYMBOL_GPL(nft_obj_notify);
7251 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7252 struct nft_object *obj, int event)
7254 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7255 ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7261 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7263 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7264 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7265 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7267 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7269 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7271 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7272 list_del_rcu(&type->list);
7273 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7275 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7277 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7278 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
7279 .len = NFT_NAME_MAXLEN - 1 },
7280 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
7281 .len = NFT_NAME_MAXLEN - 1 },
7282 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
7283 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
7284 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
7287 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7288 const struct nlattr *nla, u8 genmask)
7290 struct nft_flowtable *flowtable;
7292 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7293 if (!nla_strcmp(nla, flowtable->name) &&
7294 nft_active_genmask(flowtable, genmask))
7297 return ERR_PTR(-ENOENT);
7299 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7301 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7302 struct nft_flowtable *flowtable,
7303 enum nft_trans_phase phase)
7306 case NFT_TRANS_PREPARE:
7307 case NFT_TRANS_ABORT:
7308 case NFT_TRANS_RELEASE:
7315 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7317 static struct nft_flowtable *
7318 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7319 const struct nlattr *nla, u8 genmask)
7321 struct nft_flowtable *flowtable;
7323 list_for_each_entry(flowtable, &table->flowtables, list) {
7324 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7325 nft_active_genmask(flowtable, genmask))
7328 return ERR_PTR(-ENOENT);
7331 struct nft_flowtable_hook {
7334 struct list_head list;
7337 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7338 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
7339 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
7340 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
7343 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7344 const struct nlattr *attr,
7345 struct nft_flowtable_hook *flowtable_hook,
7346 struct nft_flowtable *flowtable, bool add)
7348 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7349 struct nft_hook *hook;
7350 int hooknum, priority;
7353 INIT_LIST_HEAD(&flowtable_hook->list);
7355 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7356 nft_flowtable_hook_policy, NULL);
7361 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7362 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7365 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7366 if (hooknum != NF_NETDEV_INGRESS)
7369 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7371 flowtable_hook->priority = priority;
7372 flowtable_hook->num = hooknum;
7374 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7375 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7376 if (hooknum != flowtable->hooknum)
7380 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7381 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7382 if (priority != flowtable->data.priority)
7386 flowtable_hook->priority = flowtable->data.priority;
7387 flowtable_hook->num = flowtable->hooknum;
7390 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7391 err = nf_tables_parse_netdev_hooks(ctx->net,
7392 tb[NFTA_FLOWTABLE_HOOK_DEVS],
7393 &flowtable_hook->list);
7398 list_for_each_entry(hook, &flowtable_hook->list, list) {
7399 hook->ops.pf = NFPROTO_NETDEV;
7400 hook->ops.hooknum = flowtable_hook->num;
7401 hook->ops.priority = flowtable_hook->priority;
7402 hook->ops.priv = &flowtable->data;
7403 hook->ops.hook = flowtable->data.type->hook;
7409 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7411 const struct nf_flowtable_type *type;
7413 list_for_each_entry(type, &nf_tables_flowtables, list) {
7414 if (family == type->family)
7420 static const struct nf_flowtable_type *
7421 nft_flowtable_type_get(struct net *net, u8 family)
7423 const struct nf_flowtable_type *type;
7425 type = __nft_flowtable_type_get(family);
7426 if (type != NULL && try_module_get(type->owner))
7429 lockdep_nfnl_nft_mutex_not_held();
7430 #ifdef CONFIG_MODULES
7432 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7433 return ERR_PTR(-EAGAIN);
7436 return ERR_PTR(-ENOENT);
7439 /* Only called from error and netdev event paths. */
7440 static void nft_unregister_flowtable_hook(struct net *net,
7441 struct nft_flowtable *flowtable,
7442 struct nft_hook *hook)
7444 nf_unregister_net_hook(net, &hook->ops);
7445 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7449 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7450 struct list_head *hook_list,
7451 bool release_netdev)
7453 struct nft_hook *hook, *next;
7455 list_for_each_entry_safe(hook, next, hook_list, list) {
7456 nf_unregister_net_hook(net, &hook->ops);
7457 if (release_netdev) {
7458 list_del(&hook->list);
7459 kfree_rcu(hook, rcu);
7464 static void nft_unregister_flowtable_net_hooks(struct net *net,
7465 struct list_head *hook_list)
7467 __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7470 static int nft_register_flowtable_net_hooks(struct net *net,
7471 struct nft_table *table,
7472 struct list_head *hook_list,
7473 struct nft_flowtable *flowtable)
7475 struct nft_hook *hook, *hook2, *next;
7476 struct nft_flowtable *ft;
7479 list_for_each_entry(hook, hook_list, list) {
7480 list_for_each_entry(ft, &table->flowtables, list) {
7481 if (!nft_is_active_next(net, ft))
7484 list_for_each_entry(hook2, &ft->hook_list, list) {
7485 if (hook->ops.dev == hook2->ops.dev &&
7486 hook->ops.pf == hook2->ops.pf) {
7488 goto err_unregister_net_hooks;
7493 err = flowtable->data.type->setup(&flowtable->data,
7497 goto err_unregister_net_hooks;
7499 err = nf_register_net_hook(net, &hook->ops);
7501 flowtable->data.type->setup(&flowtable->data,
7504 goto err_unregister_net_hooks;
7512 err_unregister_net_hooks:
7513 list_for_each_entry_safe(hook, next, hook_list, list) {
7517 nft_unregister_flowtable_hook(net, flowtable, hook);
7518 list_del_rcu(&hook->list);
7519 kfree_rcu(hook, rcu);
7525 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7527 struct nft_hook *hook, *next;
7529 list_for_each_entry_safe(hook, next, hook_list, list) {
7530 list_del_rcu(&hook->list);
7531 kfree_rcu(hook, rcu);
7535 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7536 struct nft_flowtable *flowtable)
7538 const struct nlattr * const *nla = ctx->nla;
7539 struct nft_flowtable_hook flowtable_hook;
7540 struct nft_hook *hook, *next;
7541 struct nft_trans *trans;
7542 bool unregister = false;
7546 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7547 &flowtable_hook, flowtable, false);
7551 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7552 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7553 list_del(&hook->list);
7558 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7559 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7560 if (flags & ~NFT_FLOWTABLE_MASK) {
7562 goto err_flowtable_update_hook;
7564 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7565 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7567 goto err_flowtable_update_hook;
7570 flags = flowtable->data.flags;
7573 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7574 &flowtable_hook.list, flowtable);
7576 goto err_flowtable_update_hook;
7578 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7579 sizeof(struct nft_trans_flowtable));
7583 goto err_flowtable_update_hook;
7586 nft_trans_flowtable_flags(trans) = flags;
7587 nft_trans_flowtable(trans) = flowtable;
7588 nft_trans_flowtable_update(trans) = true;
7589 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7590 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7592 nft_trans_commit_list_add_tail(ctx->net, trans);
7596 err_flowtable_update_hook:
7597 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7599 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7600 list_del_rcu(&hook->list);
7601 kfree_rcu(hook, rcu);
7608 static int nf_tables_newflowtable(struct sk_buff *skb,
7609 const struct nfnl_info *info,
7610 const struct nlattr * const nla[])
7612 struct netlink_ext_ack *extack = info->extack;
7613 struct nft_flowtable_hook flowtable_hook;
7614 u8 genmask = nft_genmask_next(info->net);
7615 u8 family = info->nfmsg->nfgen_family;
7616 const struct nf_flowtable_type *type;
7617 struct nft_flowtable *flowtable;
7618 struct nft_hook *hook, *next;
7619 struct net *net = info->net;
7620 struct nft_table *table;
7624 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7625 !nla[NFTA_FLOWTABLE_NAME] ||
7626 !nla[NFTA_FLOWTABLE_HOOK])
7629 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7630 genmask, NETLINK_CB(skb).portid);
7631 if (IS_ERR(table)) {
7632 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7633 return PTR_ERR(table);
7636 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7638 if (IS_ERR(flowtable)) {
7639 err = PTR_ERR(flowtable);
7640 if (err != -ENOENT) {
7641 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7645 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7646 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7650 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7652 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7655 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7657 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
7661 flowtable->table = table;
7662 flowtable->handle = nf_tables_alloc_handle(table);
7663 INIT_LIST_HEAD(&flowtable->hook_list);
7665 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
7666 if (!flowtable->name) {
7671 type = nft_flowtable_type_get(net, family);
7673 err = PTR_ERR(type);
7677 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7678 flowtable->data.flags =
7679 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7680 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7686 write_pnet(&flowtable->data.net, net);
7687 flowtable->data.type = type;
7688 err = type->init(&flowtable->data);
7692 err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7693 &flowtable_hook, flowtable, true);
7697 list_splice(&flowtable_hook.list, &flowtable->hook_list);
7698 flowtable->data.priority = flowtable_hook.priority;
7699 flowtable->hooknum = flowtable_hook.num;
7701 err = nft_register_flowtable_net_hooks(ctx.net, table,
7702 &flowtable->hook_list,
7705 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7709 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7713 list_add_tail_rcu(&flowtable->list, &table->flowtables);
7718 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7719 nft_unregister_flowtable_hook(net, flowtable, hook);
7720 list_del_rcu(&hook->list);
7721 kfree_rcu(hook, rcu);
7724 flowtable->data.type->free(&flowtable->data);
7726 module_put(type->owner);
7728 kfree(flowtable->name);
7734 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7736 struct nft_hook *this, *next;
7738 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7739 list_del(&this->list);
7744 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7745 struct nft_flowtable *flowtable)
7747 const struct nlattr * const *nla = ctx->nla;
7748 struct nft_flowtable_hook flowtable_hook;
7749 LIST_HEAD(flowtable_del_list);
7750 struct nft_hook *this, *hook;
7751 struct nft_trans *trans;
7754 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7755 &flowtable_hook, flowtable, false);
7759 list_for_each_entry(this, &flowtable_hook.list, list) {
7760 hook = nft_hook_list_find(&flowtable->hook_list, this);
7763 goto err_flowtable_del_hook;
7765 list_move(&hook->list, &flowtable_del_list);
7768 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7769 sizeof(struct nft_trans_flowtable));
7772 goto err_flowtable_del_hook;
7775 nft_trans_flowtable(trans) = flowtable;
7776 nft_trans_flowtable_update(trans) = true;
7777 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7778 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
7779 nft_flowtable_hook_release(&flowtable_hook);
7781 nft_trans_commit_list_add_tail(ctx->net, trans);
7785 err_flowtable_del_hook:
7786 list_splice(&flowtable_del_list, &flowtable->hook_list);
7787 nft_flowtable_hook_release(&flowtable_hook);
7792 static int nf_tables_delflowtable(struct sk_buff *skb,
7793 const struct nfnl_info *info,
7794 const struct nlattr * const nla[])
7796 struct netlink_ext_ack *extack = info->extack;
7797 u8 genmask = nft_genmask_next(info->net);
7798 u8 family = info->nfmsg->nfgen_family;
7799 struct nft_flowtable *flowtable;
7800 struct net *net = info->net;
7801 const struct nlattr *attr;
7802 struct nft_table *table;
7805 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7806 (!nla[NFTA_FLOWTABLE_NAME] &&
7807 !nla[NFTA_FLOWTABLE_HANDLE]))
7810 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7811 genmask, NETLINK_CB(skb).portid);
7812 if (IS_ERR(table)) {
7813 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7814 return PTR_ERR(table);
7817 if (nla[NFTA_FLOWTABLE_HANDLE]) {
7818 attr = nla[NFTA_FLOWTABLE_HANDLE];
7819 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7821 attr = nla[NFTA_FLOWTABLE_NAME];
7822 flowtable = nft_flowtable_lookup(table, attr, genmask);
7825 if (IS_ERR(flowtable)) {
7826 NL_SET_BAD_ATTR(extack, attr);
7827 return PTR_ERR(flowtable);
7830 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7832 if (nla[NFTA_FLOWTABLE_HOOK])
7833 return nft_delflowtable_hook(&ctx, flowtable);
7835 if (flowtable->use > 0) {
7836 NL_SET_BAD_ATTR(extack, attr);
7840 return nft_delflowtable(&ctx, flowtable);
7843 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7844 u32 portid, u32 seq, int event,
7845 u32 flags, int family,
7846 struct nft_flowtable *flowtable,
7847 struct list_head *hook_list)
7849 struct nlattr *nest, *nest_devs;
7850 struct nft_hook *hook;
7851 struct nlmsghdr *nlh;
7853 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7854 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7855 NFNETLINK_V0, nft_base_seq(net));
7857 goto nla_put_failure;
7859 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7860 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7861 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7862 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7863 NFTA_FLOWTABLE_PAD) ||
7864 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7865 goto nla_put_failure;
7867 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7869 goto nla_put_failure;
7870 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7871 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7872 goto nla_put_failure;
7874 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7876 goto nla_put_failure;
7878 list_for_each_entry_rcu(hook, hook_list, list) {
7879 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7880 goto nla_put_failure;
7882 nla_nest_end(skb, nest_devs);
7883 nla_nest_end(skb, nest);
7885 nlmsg_end(skb, nlh);
7889 nlmsg_trim(skb, nlh);
7893 struct nft_flowtable_filter {
7897 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7898 struct netlink_callback *cb)
7900 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7901 struct nft_flowtable_filter *filter = cb->data;
7902 unsigned int idx = 0, s_idx = cb->args[0];
7903 struct net *net = sock_net(skb->sk);
7904 int family = nfmsg->nfgen_family;
7905 struct nft_flowtable *flowtable;
7906 struct nftables_pernet *nft_net;
7907 const struct nft_table *table;
7910 nft_net = nft_pernet(net);
7911 cb->seq = READ_ONCE(nft_net->base_seq);
7913 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7914 if (family != NFPROTO_UNSPEC && family != table->family)
7917 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7918 if (!nft_is_active(net, flowtable))
7923 memset(&cb->args[1], 0,
7924 sizeof(cb->args) - sizeof(cb->args[0]));
7925 if (filter && filter->table &&
7926 strcmp(filter->table, table->name))
7929 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7931 NFT_MSG_NEWFLOWTABLE,
7932 NLM_F_MULTI | NLM_F_APPEND,
7935 &flowtable->hook_list) < 0)
7938 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7950 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7952 const struct nlattr * const *nla = cb->data;
7953 struct nft_flowtable_filter *filter = NULL;
7955 if (nla[NFTA_FLOWTABLE_TABLE]) {
7956 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7960 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7962 if (!filter->table) {
7972 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7974 struct nft_flowtable_filter *filter = cb->data;
7979 kfree(filter->table);
7985 /* called with rcu_read_lock held */
7986 static int nf_tables_getflowtable(struct sk_buff *skb,
7987 const struct nfnl_info *info,
7988 const struct nlattr * const nla[])
7990 u8 genmask = nft_genmask_cur(info->net);
7991 u8 family = info->nfmsg->nfgen_family;
7992 struct nft_flowtable *flowtable;
7993 const struct nft_table *table;
7994 struct net *net = info->net;
7995 struct sk_buff *skb2;
7998 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7999 struct netlink_dump_control c = {
8000 .start = nf_tables_dump_flowtable_start,
8001 .dump = nf_tables_dump_flowtable,
8002 .done = nf_tables_dump_flowtable_done,
8003 .module = THIS_MODULE,
8004 .data = (void *)nla,
8007 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8010 if (!nla[NFTA_FLOWTABLE_NAME])
8013 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8016 return PTR_ERR(table);
8018 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8020 if (IS_ERR(flowtable))
8021 return PTR_ERR(flowtable);
8023 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8027 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8028 info->nlh->nlmsg_seq,
8029 NFT_MSG_NEWFLOWTABLE, 0, family,
8030 flowtable, &flowtable->hook_list);
8032 goto err_fill_flowtable_info;
8034 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8036 err_fill_flowtable_info:
8041 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8042 struct nft_flowtable *flowtable,
8043 struct list_head *hook_list,
8046 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8047 struct sk_buff *skb;
8052 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8055 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8059 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8060 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8062 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8063 ctx->seq, event, flags,
8064 ctx->family, flowtable, hook_list);
8070 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8073 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8076 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8078 struct nft_hook *hook, *next;
8080 flowtable->data.type->free(&flowtable->data);
8081 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8082 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8084 list_del_rcu(&hook->list);
8087 kfree(flowtable->name);
8088 module_put(flowtable->data.type->owner);
8092 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8093 u32 portid, u32 seq)
8095 struct nftables_pernet *nft_net = nft_pernet(net);
8096 struct nlmsghdr *nlh;
8097 char buf[TASK_COMM_LEN];
8098 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8100 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8101 NFNETLINK_V0, nft_base_seq(net));
8103 goto nla_put_failure;
8105 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8106 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8107 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8108 goto nla_put_failure;
8110 nlmsg_end(skb, nlh);
8114 nlmsg_trim(skb, nlh);
8118 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8119 struct nft_flowtable *flowtable)
8121 struct nft_hook *hook;
8123 list_for_each_entry(hook, &flowtable->hook_list, list) {
8124 if (hook->ops.dev != dev)
8127 /* flow_offload_netdev_event() cleans up entries for us. */
8128 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8129 list_del_rcu(&hook->list);
8130 kfree_rcu(hook, rcu);
8135 static int nf_tables_flowtable_event(struct notifier_block *this,
8136 unsigned long event, void *ptr)
8138 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8139 struct nft_flowtable *flowtable;
8140 struct nftables_pernet *nft_net;
8141 struct nft_table *table;
8144 if (event != NETDEV_UNREGISTER)
8148 nft_net = nft_pernet(net);
8149 mutex_lock(&nft_net->commit_mutex);
8150 list_for_each_entry(table, &nft_net->tables, list) {
8151 list_for_each_entry(flowtable, &table->flowtables, list) {
8152 nft_flowtable_event(event, dev, flowtable);
8155 mutex_unlock(&nft_net->commit_mutex);
8160 static struct notifier_block nf_tables_flowtable_notifier = {
8161 .notifier_call = nf_tables_flowtable_event,
8164 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8167 struct nlmsghdr *nlh = nlmsg_hdr(skb);
8168 struct sk_buff *skb2;
8171 if (!nlmsg_report(nlh) &&
8172 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8175 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8179 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8186 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8187 nlmsg_report(nlh), GFP_KERNEL);
8190 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8194 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8195 const struct nlattr * const nla[])
8197 struct sk_buff *skb2;
8200 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8204 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8205 info->nlh->nlmsg_seq);
8207 goto err_fill_gen_info;
8209 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8216 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8217 [NFT_MSG_NEWTABLE] = {
8218 .call = nf_tables_newtable,
8219 .type = NFNL_CB_BATCH,
8220 .attr_count = NFTA_TABLE_MAX,
8221 .policy = nft_table_policy,
8223 [NFT_MSG_GETTABLE] = {
8224 .call = nf_tables_gettable,
8225 .type = NFNL_CB_RCU,
8226 .attr_count = NFTA_TABLE_MAX,
8227 .policy = nft_table_policy,
8229 [NFT_MSG_DELTABLE] = {
8230 .call = nf_tables_deltable,
8231 .type = NFNL_CB_BATCH,
8232 .attr_count = NFTA_TABLE_MAX,
8233 .policy = nft_table_policy,
8235 [NFT_MSG_NEWCHAIN] = {
8236 .call = nf_tables_newchain,
8237 .type = NFNL_CB_BATCH,
8238 .attr_count = NFTA_CHAIN_MAX,
8239 .policy = nft_chain_policy,
8241 [NFT_MSG_GETCHAIN] = {
8242 .call = nf_tables_getchain,
8243 .type = NFNL_CB_RCU,
8244 .attr_count = NFTA_CHAIN_MAX,
8245 .policy = nft_chain_policy,
8247 [NFT_MSG_DELCHAIN] = {
8248 .call = nf_tables_delchain,
8249 .type = NFNL_CB_BATCH,
8250 .attr_count = NFTA_CHAIN_MAX,
8251 .policy = nft_chain_policy,
8253 [NFT_MSG_NEWRULE] = {
8254 .call = nf_tables_newrule,
8255 .type = NFNL_CB_BATCH,
8256 .attr_count = NFTA_RULE_MAX,
8257 .policy = nft_rule_policy,
8259 [NFT_MSG_GETRULE] = {
8260 .call = nf_tables_getrule,
8261 .type = NFNL_CB_RCU,
8262 .attr_count = NFTA_RULE_MAX,
8263 .policy = nft_rule_policy,
8265 [NFT_MSG_DELRULE] = {
8266 .call = nf_tables_delrule,
8267 .type = NFNL_CB_BATCH,
8268 .attr_count = NFTA_RULE_MAX,
8269 .policy = nft_rule_policy,
8271 [NFT_MSG_NEWSET] = {
8272 .call = nf_tables_newset,
8273 .type = NFNL_CB_BATCH,
8274 .attr_count = NFTA_SET_MAX,
8275 .policy = nft_set_policy,
8277 [NFT_MSG_GETSET] = {
8278 .call = nf_tables_getset,
8279 .type = NFNL_CB_RCU,
8280 .attr_count = NFTA_SET_MAX,
8281 .policy = nft_set_policy,
8283 [NFT_MSG_DELSET] = {
8284 .call = nf_tables_delset,
8285 .type = NFNL_CB_BATCH,
8286 .attr_count = NFTA_SET_MAX,
8287 .policy = nft_set_policy,
8289 [NFT_MSG_NEWSETELEM] = {
8290 .call = nf_tables_newsetelem,
8291 .type = NFNL_CB_BATCH,
8292 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8293 .policy = nft_set_elem_list_policy,
8295 [NFT_MSG_GETSETELEM] = {
8296 .call = nf_tables_getsetelem,
8297 .type = NFNL_CB_RCU,
8298 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8299 .policy = nft_set_elem_list_policy,
8301 [NFT_MSG_DELSETELEM] = {
8302 .call = nf_tables_delsetelem,
8303 .type = NFNL_CB_BATCH,
8304 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8305 .policy = nft_set_elem_list_policy,
8307 [NFT_MSG_GETGEN] = {
8308 .call = nf_tables_getgen,
8309 .type = NFNL_CB_RCU,
8311 [NFT_MSG_NEWOBJ] = {
8312 .call = nf_tables_newobj,
8313 .type = NFNL_CB_BATCH,
8314 .attr_count = NFTA_OBJ_MAX,
8315 .policy = nft_obj_policy,
8317 [NFT_MSG_GETOBJ] = {
8318 .call = nf_tables_getobj,
8319 .type = NFNL_CB_RCU,
8320 .attr_count = NFTA_OBJ_MAX,
8321 .policy = nft_obj_policy,
8323 [NFT_MSG_DELOBJ] = {
8324 .call = nf_tables_delobj,
8325 .type = NFNL_CB_BATCH,
8326 .attr_count = NFTA_OBJ_MAX,
8327 .policy = nft_obj_policy,
8329 [NFT_MSG_GETOBJ_RESET] = {
8330 .call = nf_tables_getobj,
8331 .type = NFNL_CB_RCU,
8332 .attr_count = NFTA_OBJ_MAX,
8333 .policy = nft_obj_policy,
8335 [NFT_MSG_NEWFLOWTABLE] = {
8336 .call = nf_tables_newflowtable,
8337 .type = NFNL_CB_BATCH,
8338 .attr_count = NFTA_FLOWTABLE_MAX,
8339 .policy = nft_flowtable_policy,
8341 [NFT_MSG_GETFLOWTABLE] = {
8342 .call = nf_tables_getflowtable,
8343 .type = NFNL_CB_RCU,
8344 .attr_count = NFTA_FLOWTABLE_MAX,
8345 .policy = nft_flowtable_policy,
8347 [NFT_MSG_DELFLOWTABLE] = {
8348 .call = nf_tables_delflowtable,
8349 .type = NFNL_CB_BATCH,
8350 .attr_count = NFTA_FLOWTABLE_MAX,
8351 .policy = nft_flowtable_policy,
8355 static int nf_tables_validate(struct net *net)
8357 struct nftables_pernet *nft_net = nft_pernet(net);
8358 struct nft_table *table;
8360 switch (nft_net->validate_state) {
8361 case NFT_VALIDATE_SKIP:
8363 case NFT_VALIDATE_NEED:
8364 nft_validate_state_update(net, NFT_VALIDATE_DO);
8366 case NFT_VALIDATE_DO:
8367 list_for_each_entry(table, &nft_net->tables, list) {
8368 if (nft_table_validate(net, table) < 0)
8377 /* a drop policy has to be deferred until all rules have been activated,
8378 * otherwise a large ruleset that contains a drop-policy base chain will
8379 * cause all packets to get dropped until the full transaction has been
8382 * We defer the drop policy until the transaction has been finalized.
8384 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8386 struct nft_base_chain *basechain;
8388 if (nft_trans_chain_policy(trans) != NF_DROP)
8391 if (!nft_is_base_chain(trans->ctx.chain))
8394 basechain = nft_base_chain(trans->ctx.chain);
8395 basechain->policy = NF_DROP;
8398 static void nft_chain_commit_update(struct nft_trans *trans)
8400 struct nft_base_chain *basechain;
8402 if (nft_trans_chain_name(trans)) {
8403 rhltable_remove(&trans->ctx.table->chains_ht,
8404 &trans->ctx.chain->rhlhead,
8405 nft_chain_ht_params);
8406 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8407 rhltable_insert_key(&trans->ctx.table->chains_ht,
8408 trans->ctx.chain->name,
8409 &trans->ctx.chain->rhlhead,
8410 nft_chain_ht_params);
8413 if (!nft_is_base_chain(trans->ctx.chain))
8416 nft_chain_stats_replace(trans);
8418 basechain = nft_base_chain(trans->ctx.chain);
8420 switch (nft_trans_chain_policy(trans)) {
8423 basechain->policy = nft_trans_chain_policy(trans);
8428 static void nft_obj_commit_update(struct nft_trans *trans)
8430 struct nft_object *newobj;
8431 struct nft_object *obj;
8433 obj = nft_trans_obj(trans);
8434 newobj = nft_trans_obj_newobj(trans);
8436 if (obj->ops->update)
8437 obj->ops->update(obj, newobj);
8439 nft_obj_destroy(&trans->ctx, newobj);
8442 static void nft_commit_release(struct nft_trans *trans)
8444 switch (trans->msg_type) {
8445 case NFT_MSG_DELTABLE:
8446 nf_tables_table_destroy(&trans->ctx);
8448 case NFT_MSG_NEWCHAIN:
8449 free_percpu(nft_trans_chain_stats(trans));
8450 kfree(nft_trans_chain_name(trans));
8452 case NFT_MSG_DELCHAIN:
8453 nf_tables_chain_destroy(&trans->ctx);
8455 case NFT_MSG_DELRULE:
8456 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8457 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8459 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8461 case NFT_MSG_DELSET:
8462 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8464 case NFT_MSG_DELSETELEM:
8465 nf_tables_set_elem_destroy(&trans->ctx,
8466 nft_trans_elem_set(trans),
8467 nft_trans_elem(trans).priv);
8469 case NFT_MSG_DELOBJ:
8470 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8472 case NFT_MSG_DELFLOWTABLE:
8473 if (nft_trans_flowtable_update(trans))
8474 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8476 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8481 put_net(trans->ctx.net);
8486 static void nf_tables_trans_destroy_work(struct work_struct *w)
8488 struct nft_trans *trans, *next;
8491 spin_lock(&nf_tables_destroy_list_lock);
8492 list_splice_init(&nf_tables_destroy_list, &head);
8493 spin_unlock(&nf_tables_destroy_list_lock);
8495 if (list_empty(&head))
8500 list_for_each_entry_safe(trans, next, &head, list) {
8501 list_del(&trans->list);
8502 nft_commit_release(trans);
8506 void nf_tables_trans_destroy_flush_work(void)
8508 flush_work(&trans_destroy_work);
8510 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8512 static bool nft_expr_reduce(struct nft_regs_track *track,
8513 const struct nft_expr *expr)
8518 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8520 const struct nft_expr *expr, *last;
8521 struct nft_regs_track track = {};
8522 unsigned int size, data_size;
8523 void *data, *data_boundary;
8524 struct nft_rule_dp *prule;
8525 struct nft_rule *rule;
8527 /* already handled or inactive chain? */
8528 if (chain->blob_next || !nft_is_active_next(net, chain))
8532 list_for_each_entry(rule, &chain->rules, list) {
8533 if (nft_is_active_next(net, rule)) {
8534 data_size += sizeof(*prule) + rule->dlen;
8535 if (data_size > INT_MAX)
8539 data_size += offsetof(struct nft_rule_dp, data); /* last rule */
8541 chain->blob_next = nf_tables_chain_alloc_rules(data_size);
8542 if (!chain->blob_next)
8545 data = (void *)chain->blob_next->data;
8546 data_boundary = data + data_size;
8549 list_for_each_entry(rule, &chain->rules, list) {
8550 if (!nft_is_active_next(net, rule))
8553 prule = (struct nft_rule_dp *)data;
8554 data += offsetof(struct nft_rule_dp, data);
8555 if (WARN_ON_ONCE(data > data_boundary))
8559 track.last = nft_expr_last(rule);
8560 nft_rule_for_each_expr(expr, last, rule) {
8563 if (nft_expr_reduce(&track, expr)) {
8568 if (WARN_ON_ONCE(data + expr->ops->size > data_boundary))
8571 memcpy(data + size, expr, expr->ops->size);
8572 size += expr->ops->size;
8574 if (WARN_ON_ONCE(size >= 1 << 12))
8577 prule->handle = rule->handle;
8583 chain->blob_next->size += (unsigned long)(data - (void *)prule);
8586 prule = (struct nft_rule_dp *)data;
8587 data += offsetof(struct nft_rule_dp, data);
8588 if (WARN_ON_ONCE(data > data_boundary))
8591 nft_last_rule(chain->blob_next, prule);
8596 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8598 struct nftables_pernet *nft_net = nft_pernet(net);
8599 struct nft_trans *trans, *next;
8601 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8602 struct nft_chain *chain = trans->ctx.chain;
8604 if (trans->msg_type == NFT_MSG_NEWRULE ||
8605 trans->msg_type == NFT_MSG_DELRULE) {
8606 kvfree(chain->blob_next);
8607 chain->blob_next = NULL;
8612 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8614 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8619 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
8621 struct nft_rules_old *old;
8623 /* rcu_head is after end marker */
8624 old = (void *)blob + sizeof(*blob) + blob->size;
8627 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8630 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8632 struct nft_rule_blob *g0, *g1;
8635 next_genbit = nft_gencursor_next(net);
8637 g0 = rcu_dereference_protected(chain->blob_gen_0,
8638 lockdep_commit_lock_is_held(net));
8639 g1 = rcu_dereference_protected(chain->blob_gen_1,
8640 lockdep_commit_lock_is_held(net));
8642 /* No changes to this chain? */
8643 if (chain->blob_next == NULL) {
8644 /* chain had no change in last or next generation */
8648 * chain had no change in this generation; make sure next
8649 * one uses same rules as current generation.
8652 rcu_assign_pointer(chain->blob_gen_1, g0);
8653 nf_tables_commit_chain_free_rules_old(g1);
8655 rcu_assign_pointer(chain->blob_gen_0, g1);
8656 nf_tables_commit_chain_free_rules_old(g0);
8663 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
8665 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
8667 chain->blob_next = NULL;
8673 nf_tables_commit_chain_free_rules_old(g1);
8675 nf_tables_commit_chain_free_rules_old(g0);
8678 static void nft_obj_del(struct nft_object *obj)
8680 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8681 list_del_rcu(&obj->list);
8684 void nft_chain_del(struct nft_chain *chain)
8686 struct nft_table *table = chain->table;
8688 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8689 nft_chain_ht_params));
8690 list_del_rcu(&chain->list);
8693 static void nf_tables_module_autoload_cleanup(struct net *net)
8695 struct nftables_pernet *nft_net = nft_pernet(net);
8696 struct nft_module_request *req, *next;
8698 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8699 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8700 WARN_ON_ONCE(!req->done);
8701 list_del(&req->list);
8706 static void nf_tables_commit_release(struct net *net)
8708 struct nftables_pernet *nft_net = nft_pernet(net);
8709 struct nft_trans *trans;
8711 /* all side effects have to be made visible.
8712 * For example, if a chain named 'foo' has been deleted, a
8713 * new transaction must not find it anymore.
8715 * Memory reclaim happens asynchronously from work queue
8716 * to prevent expensive synchronize_rcu() in commit phase.
8718 if (list_empty(&nft_net->commit_list)) {
8719 nf_tables_module_autoload_cleanup(net);
8720 mutex_unlock(&nft_net->commit_mutex);
8724 trans = list_last_entry(&nft_net->commit_list,
8725 struct nft_trans, list);
8726 get_net(trans->ctx.net);
8727 WARN_ON_ONCE(trans->put_net);
8729 trans->put_net = true;
8730 spin_lock(&nf_tables_destroy_list_lock);
8731 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
8732 spin_unlock(&nf_tables_destroy_list_lock);
8734 nf_tables_module_autoload_cleanup(net);
8735 schedule_work(&trans_destroy_work);
8737 mutex_unlock(&nft_net->commit_mutex);
8740 static void nft_commit_notify(struct net *net, u32 portid)
8742 struct nftables_pernet *nft_net = nft_pernet(net);
8743 struct sk_buff *batch_skb = NULL, *nskb, *skb;
8744 unsigned char *data;
8747 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
8751 len = NLMSG_GOODSIZE - skb->len;
8752 list_del(&skb->list);
8756 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8757 data = skb_put(batch_skb, skb->len);
8758 memcpy(data, skb->data, skb->len);
8759 list_del(&skb->list);
8763 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8764 NFT_CB(batch_skb).report, GFP_KERNEL);
8769 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8770 NFT_CB(batch_skb).report, GFP_KERNEL);
8773 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
8776 static int nf_tables_commit_audit_alloc(struct list_head *adl,
8777 struct nft_table *table)
8779 struct nft_audit_data *adp;
8781 list_for_each_entry(adp, adl, list) {
8782 if (adp->table == table)
8785 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
8789 list_add(&adp->list, adl);
8793 static void nf_tables_commit_audit_free(struct list_head *adl)
8795 struct nft_audit_data *adp, *adn;
8797 list_for_each_entry_safe(adp, adn, adl, list) {
8798 list_del(&adp->list);
8803 static void nf_tables_commit_audit_collect(struct list_head *adl,
8804 struct nft_table *table, u32 op)
8806 struct nft_audit_data *adp;
8808 list_for_each_entry(adp, adl, list) {
8809 if (adp->table == table)
8812 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
8816 if (!adp->op || adp->op > op)
8820 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
8822 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
8824 struct nft_audit_data *adp, *adn;
8825 char aubuf[AUNFTABLENAMELEN];
8827 list_for_each_entry_safe(adp, adn, adl, list) {
8828 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
8830 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
8831 nft2audit_op[adp->op], GFP_KERNEL);
8832 list_del(&adp->list);
8837 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8839 struct nftables_pernet *nft_net = nft_pernet(net);
8840 struct nft_trans *trans, *next;
8841 struct nft_trans_elem *te;
8842 struct nft_chain *chain;
8843 struct nft_table *table;
8844 unsigned int base_seq;
8848 if (list_empty(&nft_net->commit_list)) {
8849 mutex_unlock(&nft_net->commit_mutex);
8853 /* 0. Validate ruleset, otherwise roll back for error reporting. */
8854 if (nf_tables_validate(net) < 0)
8857 err = nft_flow_rule_offload_commit(net);
8861 /* 1. Allocate space for next generation rules_gen_X[] */
8862 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8865 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
8867 nf_tables_commit_chain_prepare_cancel(net);
8868 nf_tables_commit_audit_free(&adl);
8871 if (trans->msg_type == NFT_MSG_NEWRULE ||
8872 trans->msg_type == NFT_MSG_DELRULE) {
8873 chain = trans->ctx.chain;
8875 ret = nf_tables_commit_chain_prepare(net, chain);
8877 nf_tables_commit_chain_prepare_cancel(net);
8878 nf_tables_commit_audit_free(&adl);
8884 /* step 2. Make rules_gen_X visible to packet path */
8885 list_for_each_entry(table, &nft_net->tables, list) {
8886 list_for_each_entry(chain, &table->chains, list)
8887 nf_tables_commit_chain(net, chain);
8891 * Bump generation counter, invalidate any dump in progress.
8892 * Cannot fail after this point.
8894 base_seq = READ_ONCE(nft_net->base_seq);
8895 while (++base_seq == 0)
8898 WRITE_ONCE(nft_net->base_seq, base_seq);
8900 /* step 3. Start new generation, rules_gen_X now in use. */
8901 net->nft.gencursor = nft_gencursor_next(net);
8903 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8904 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
8906 switch (trans->msg_type) {
8907 case NFT_MSG_NEWTABLE:
8908 if (nft_trans_table_update(trans)) {
8909 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8910 nft_trans_destroy(trans);
8913 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
8914 nf_tables_table_disable(net, trans->ctx.table);
8916 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8918 nft_clear(net, trans->ctx.table);
8920 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8921 nft_trans_destroy(trans);
8923 case NFT_MSG_DELTABLE:
8924 list_del_rcu(&trans->ctx.table->list);
8925 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8927 case NFT_MSG_NEWCHAIN:
8928 if (nft_trans_chain_update(trans)) {
8929 nft_chain_commit_update(trans);
8930 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8931 /* trans destroyed after rcu grace period */
8933 nft_chain_commit_drop_policy(trans);
8934 nft_clear(net, trans->ctx.chain);
8935 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8936 nft_trans_destroy(trans);
8939 case NFT_MSG_DELCHAIN:
8940 nft_chain_del(trans->ctx.chain);
8941 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8942 nf_tables_unregister_hook(trans->ctx.net,
8946 case NFT_MSG_NEWRULE:
8947 nft_clear(trans->ctx.net, nft_trans_rule(trans));
8948 nf_tables_rule_notify(&trans->ctx,
8949 nft_trans_rule(trans),
8951 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8952 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8954 nft_trans_destroy(trans);
8956 case NFT_MSG_DELRULE:
8957 list_del_rcu(&nft_trans_rule(trans)->list);
8958 nf_tables_rule_notify(&trans->ctx,
8959 nft_trans_rule(trans),
8961 nft_rule_expr_deactivate(&trans->ctx,
8962 nft_trans_rule(trans),
8965 case NFT_MSG_NEWSET:
8966 nft_clear(net, nft_trans_set(trans));
8967 /* This avoids hitting -EBUSY when deleting the table
8968 * from the transaction.
8970 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8971 !list_empty(&nft_trans_set(trans)->bindings))
8972 trans->ctx.table->use--;
8974 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8975 NFT_MSG_NEWSET, GFP_KERNEL);
8976 nft_trans_destroy(trans);
8978 case NFT_MSG_DELSET:
8979 list_del_rcu(&nft_trans_set(trans)->list);
8980 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8981 NFT_MSG_DELSET, GFP_KERNEL);
8983 case NFT_MSG_NEWSETELEM:
8984 te = (struct nft_trans_elem *)trans->data;
8986 nft_setelem_activate(net, te->set, &te->elem);
8987 nf_tables_setelem_notify(&trans->ctx, te->set,
8989 NFT_MSG_NEWSETELEM);
8990 nft_trans_destroy(trans);
8992 case NFT_MSG_DELSETELEM:
8993 te = (struct nft_trans_elem *)trans->data;
8995 nf_tables_setelem_notify(&trans->ctx, te->set,
8997 NFT_MSG_DELSETELEM);
8998 nft_setelem_remove(net, te->set, &te->elem);
8999 if (!nft_setelem_is_catchall(te->set, &te->elem)) {
9000 atomic_dec(&te->set->nelems);
9004 case NFT_MSG_NEWOBJ:
9005 if (nft_trans_obj_update(trans)) {
9006 nft_obj_commit_update(trans);
9007 nf_tables_obj_notify(&trans->ctx,
9008 nft_trans_obj(trans),
9011 nft_clear(net, nft_trans_obj(trans));
9012 nf_tables_obj_notify(&trans->ctx,
9013 nft_trans_obj(trans),
9015 nft_trans_destroy(trans);
9018 case NFT_MSG_DELOBJ:
9019 nft_obj_del(nft_trans_obj(trans));
9020 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
9023 case NFT_MSG_NEWFLOWTABLE:
9024 if (nft_trans_flowtable_update(trans)) {
9025 nft_trans_flowtable(trans)->data.flags =
9026 nft_trans_flowtable_flags(trans);
9027 nf_tables_flowtable_notify(&trans->ctx,
9028 nft_trans_flowtable(trans),
9029 &nft_trans_flowtable_hooks(trans),
9030 NFT_MSG_NEWFLOWTABLE);
9031 list_splice(&nft_trans_flowtable_hooks(trans),
9032 &nft_trans_flowtable(trans)->hook_list);
9034 nft_clear(net, nft_trans_flowtable(trans));
9035 nf_tables_flowtable_notify(&trans->ctx,
9036 nft_trans_flowtable(trans),
9037 &nft_trans_flowtable(trans)->hook_list,
9038 NFT_MSG_NEWFLOWTABLE);
9040 nft_trans_destroy(trans);
9042 case NFT_MSG_DELFLOWTABLE:
9043 if (nft_trans_flowtable_update(trans)) {
9044 nf_tables_flowtable_notify(&trans->ctx,
9045 nft_trans_flowtable(trans),
9046 &nft_trans_flowtable_hooks(trans),
9047 NFT_MSG_DELFLOWTABLE);
9048 nft_unregister_flowtable_net_hooks(net,
9049 &nft_trans_flowtable_hooks(trans));
9051 list_del_rcu(&nft_trans_flowtable(trans)->list);
9052 nf_tables_flowtable_notify(&trans->ctx,
9053 nft_trans_flowtable(trans),
9054 &nft_trans_flowtable(trans)->hook_list,
9055 NFT_MSG_DELFLOWTABLE);
9056 nft_unregister_flowtable_net_hooks(net,
9057 &nft_trans_flowtable(trans)->hook_list);
9063 nft_commit_notify(net, NETLINK_CB(skb).portid);
9064 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
9065 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
9066 nf_tables_commit_release(net);
9071 static void nf_tables_module_autoload(struct net *net)
9073 struct nftables_pernet *nft_net = nft_pernet(net);
9074 struct nft_module_request *req, *next;
9075 LIST_HEAD(module_list);
9077 list_splice_init(&nft_net->module_list, &module_list);
9078 mutex_unlock(&nft_net->commit_mutex);
9079 list_for_each_entry_safe(req, next, &module_list, list) {
9080 request_module("%s", req->module);
9083 mutex_lock(&nft_net->commit_mutex);
9084 list_splice(&module_list, &nft_net->module_list);
9087 static void nf_tables_abort_release(struct nft_trans *trans)
9089 switch (trans->msg_type) {
9090 case NFT_MSG_NEWTABLE:
9091 nf_tables_table_destroy(&trans->ctx);
9093 case NFT_MSG_NEWCHAIN:
9094 nf_tables_chain_destroy(&trans->ctx);
9096 case NFT_MSG_NEWRULE:
9097 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9099 case NFT_MSG_NEWSET:
9100 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9102 case NFT_MSG_NEWSETELEM:
9103 nft_set_elem_destroy(nft_trans_elem_set(trans),
9104 nft_trans_elem(trans).priv, true);
9106 case NFT_MSG_NEWOBJ:
9107 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9109 case NFT_MSG_NEWFLOWTABLE:
9110 if (nft_trans_flowtable_update(trans))
9111 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9113 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9119 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9121 struct nftables_pernet *nft_net = nft_pernet(net);
9122 struct nft_trans *trans, *next;
9123 struct nft_trans_elem *te;
9125 if (action == NFNL_ABORT_VALIDATE &&
9126 nf_tables_validate(net) < 0)
9129 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9131 switch (trans->msg_type) {
9132 case NFT_MSG_NEWTABLE:
9133 if (nft_trans_table_update(trans)) {
9134 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9135 nft_trans_destroy(trans);
9138 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9139 nf_tables_table_disable(net, trans->ctx.table);
9140 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9141 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9142 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9144 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9145 nft_trans_destroy(trans);
9147 list_del_rcu(&trans->ctx.table->list);
9150 case NFT_MSG_DELTABLE:
9151 nft_clear(trans->ctx.net, trans->ctx.table);
9152 nft_trans_destroy(trans);
9154 case NFT_MSG_NEWCHAIN:
9155 if (nft_trans_chain_update(trans)) {
9156 free_percpu(nft_trans_chain_stats(trans));
9157 kfree(nft_trans_chain_name(trans));
9158 nft_trans_destroy(trans);
9160 if (nft_chain_is_bound(trans->ctx.chain)) {
9161 nft_trans_destroy(trans);
9164 trans->ctx.table->use--;
9165 nft_chain_del(trans->ctx.chain);
9166 nf_tables_unregister_hook(trans->ctx.net,
9171 case NFT_MSG_DELCHAIN:
9172 trans->ctx.table->use++;
9173 nft_clear(trans->ctx.net, trans->ctx.chain);
9174 nft_trans_destroy(trans);
9176 case NFT_MSG_NEWRULE:
9177 trans->ctx.chain->use--;
9178 list_del_rcu(&nft_trans_rule(trans)->list);
9179 nft_rule_expr_deactivate(&trans->ctx,
9180 nft_trans_rule(trans),
9182 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9183 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9185 case NFT_MSG_DELRULE:
9186 trans->ctx.chain->use++;
9187 nft_clear(trans->ctx.net, nft_trans_rule(trans));
9188 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9189 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9190 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9192 nft_trans_destroy(trans);
9194 case NFT_MSG_NEWSET:
9195 trans->ctx.table->use--;
9196 if (nft_trans_set_bound(trans)) {
9197 nft_trans_destroy(trans);
9200 list_del_rcu(&nft_trans_set(trans)->list);
9202 case NFT_MSG_DELSET:
9203 trans->ctx.table->use++;
9204 nft_clear(trans->ctx.net, nft_trans_set(trans));
9205 nft_trans_destroy(trans);
9207 case NFT_MSG_NEWSETELEM:
9208 if (nft_trans_elem_set_bound(trans)) {
9209 nft_trans_destroy(trans);
9212 te = (struct nft_trans_elem *)trans->data;
9213 nft_setelem_remove(net, te->set, &te->elem);
9214 if (!nft_setelem_is_catchall(te->set, &te->elem))
9215 atomic_dec(&te->set->nelems);
9217 case NFT_MSG_DELSETELEM:
9218 te = (struct nft_trans_elem *)trans->data;
9220 nft_setelem_data_activate(net, te->set, &te->elem);
9221 nft_setelem_activate(net, te->set, &te->elem);
9222 if (!nft_setelem_is_catchall(te->set, &te->elem))
9225 nft_trans_destroy(trans);
9227 case NFT_MSG_NEWOBJ:
9228 if (nft_trans_obj_update(trans)) {
9229 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9230 nft_trans_destroy(trans);
9232 trans->ctx.table->use--;
9233 nft_obj_del(nft_trans_obj(trans));
9236 case NFT_MSG_DELOBJ:
9237 trans->ctx.table->use++;
9238 nft_clear(trans->ctx.net, nft_trans_obj(trans));
9239 nft_trans_destroy(trans);
9241 case NFT_MSG_NEWFLOWTABLE:
9242 if (nft_trans_flowtable_update(trans)) {
9243 nft_unregister_flowtable_net_hooks(net,
9244 &nft_trans_flowtable_hooks(trans));
9246 trans->ctx.table->use--;
9247 list_del_rcu(&nft_trans_flowtable(trans)->list);
9248 nft_unregister_flowtable_net_hooks(net,
9249 &nft_trans_flowtable(trans)->hook_list);
9252 case NFT_MSG_DELFLOWTABLE:
9253 if (nft_trans_flowtable_update(trans)) {
9254 list_splice(&nft_trans_flowtable_hooks(trans),
9255 &nft_trans_flowtable(trans)->hook_list);
9257 trans->ctx.table->use++;
9258 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9260 nft_trans_destroy(trans);
9267 list_for_each_entry_safe_reverse(trans, next,
9268 &nft_net->commit_list, list) {
9269 list_del(&trans->list);
9270 nf_tables_abort_release(trans);
9273 if (action == NFNL_ABORT_AUTOLOAD)
9274 nf_tables_module_autoload(net);
9276 nf_tables_module_autoload_cleanup(net);
9281 static void nf_tables_cleanup(struct net *net)
9283 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
9286 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9287 enum nfnl_abort_action action)
9289 struct nftables_pernet *nft_net = nft_pernet(net);
9290 int ret = __nf_tables_abort(net, action);
9292 mutex_unlock(&nft_net->commit_mutex);
9297 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9299 struct nftables_pernet *nft_net = nft_pernet(net);
9302 mutex_lock(&nft_net->commit_mutex);
9304 genid_ok = genid == 0 || nft_net->base_seq == genid;
9306 mutex_unlock(&nft_net->commit_mutex);
9308 /* else, commit mutex has to be released by commit or abort function */
9312 static const struct nfnetlink_subsystem nf_tables_subsys = {
9313 .name = "nf_tables",
9314 .subsys_id = NFNL_SUBSYS_NFTABLES,
9315 .cb_count = NFT_MSG_MAX,
9317 .commit = nf_tables_commit,
9318 .abort = nf_tables_abort,
9319 .cleanup = nf_tables_cleanup,
9320 .valid_genid = nf_tables_valid_genid,
9321 .owner = THIS_MODULE,
9324 int nft_chain_validate_dependency(const struct nft_chain *chain,
9325 enum nft_chain_types type)
9327 const struct nft_base_chain *basechain;
9329 if (nft_is_base_chain(chain)) {
9330 basechain = nft_base_chain(chain);
9331 if (basechain->type->type != type)
9336 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9338 int nft_chain_validate_hooks(const struct nft_chain *chain,
9339 unsigned int hook_flags)
9341 struct nft_base_chain *basechain;
9343 if (nft_is_base_chain(chain)) {
9344 basechain = nft_base_chain(chain);
9346 if ((1 << basechain->ops.hooknum) & hook_flags)
9354 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9357 * Loop detection - walk through the ruleset beginning at the destination chain
9358 * of a new jump until either the source chain is reached (loop) or all
9359 * reachable chains have been traversed.
9361 * The loop check is performed whenever a new jump verdict is added to an
9362 * expression or verdict map or a verdict map is bound to a new chain.
9365 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9366 const struct nft_chain *chain);
9368 static int nft_check_loops(const struct nft_ctx *ctx,
9369 const struct nft_set_ext *ext)
9371 const struct nft_data *data;
9374 data = nft_set_ext_data(ext);
9375 switch (data->verdict.code) {
9378 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9388 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9389 struct nft_set *set,
9390 const struct nft_set_iter *iter,
9391 struct nft_set_elem *elem)
9393 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9395 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9396 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9399 return nft_check_loops(ctx, ext);
9402 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9403 struct nft_set *set)
9405 u8 genmask = nft_genmask_next(ctx->net);
9406 struct nft_set_elem_catchall *catchall;
9407 struct nft_set_ext *ext;
9410 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9411 ext = nft_set_elem_ext(set, catchall->elem);
9412 if (!nft_set_elem_active(ext, genmask))
9415 ret = nft_check_loops(ctx, ext);
9423 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9424 const struct nft_chain *chain)
9426 const struct nft_rule *rule;
9427 const struct nft_expr *expr, *last;
9428 struct nft_set *set;
9429 struct nft_set_binding *binding;
9430 struct nft_set_iter iter;
9432 if (ctx->chain == chain)
9435 list_for_each_entry(rule, &chain->rules, list) {
9436 nft_rule_for_each_expr(expr, last, rule) {
9437 struct nft_immediate_expr *priv;
9438 const struct nft_data *data;
9441 if (strcmp(expr->ops->type->name, "immediate"))
9444 priv = nft_expr_priv(expr);
9445 if (priv->dreg != NFT_REG_VERDICT)
9449 switch (data->verdict.code) {
9452 err = nf_tables_check_loops(ctx,
9453 data->verdict.chain);
9463 list_for_each_entry(set, &ctx->table->sets, list) {
9464 if (!nft_is_active_next(ctx->net, set))
9466 if (!(set->flags & NFT_SET_MAP) ||
9467 set->dtype != NFT_DATA_VERDICT)
9470 list_for_each_entry(binding, &set->bindings, list) {
9471 if (!(binding->flags & NFT_SET_MAP) ||
9472 binding->chain != chain)
9475 iter.genmask = nft_genmask_next(ctx->net);
9479 iter.fn = nf_tables_loop_check_setelem;
9481 set->ops->walk(ctx, set, &iter);
9483 iter.err = nft_set_catchall_loops(ctx, set);
9494 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
9496 * @attr: netlink attribute to fetch value from
9497 * @max: maximum value to be stored in dest
9498 * @dest: pointer to the variable
9500 * Parse, check and store a given u32 netlink attribute into variable.
9501 * This function returns -ERANGE if the value goes over maximum value.
9502 * Otherwise a 0 is returned and the attribute value is stored in the
9503 * destination variable.
9505 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9509 val = ntohl(nla_get_be32(attr));
9516 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9518 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
9522 reg = ntohl(nla_get_be32(attr));
9524 case NFT_REG_VERDICT...NFT_REG_4:
9525 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9527 case NFT_REG32_00...NFT_REG32_15:
9528 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9538 * nft_dump_register - dump a register value to a netlink attribute
9540 * @skb: socket buffer
9541 * @attr: attribute number
9542 * @reg: register number
9544 * Construct a netlink attribute containing the register number. For
9545 * compatibility reasons, register numbers being a multiple of 4 are
9546 * translated to the corresponding 128 bit register numbers.
9548 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9550 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9551 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9553 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9555 return nla_put_be32(skb, attr, htonl(reg));
9557 EXPORT_SYMBOL_GPL(nft_dump_register);
9559 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9561 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9565 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9571 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9576 err = nft_parse_register(attr, ®);
9580 err = nft_validate_register_load(reg, len);
9587 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9589 static int nft_validate_register_store(const struct nft_ctx *ctx,
9590 enum nft_registers reg,
9591 const struct nft_data *data,
9592 enum nft_data_types type,
9598 case NFT_REG_VERDICT:
9599 if (type != NFT_DATA_VERDICT)
9603 (data->verdict.code == NFT_GOTO ||
9604 data->verdict.code == NFT_JUMP)) {
9605 err = nf_tables_check_loops(ctx, data->verdict.chain);
9612 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9616 if (reg * NFT_REG32_SIZE + len >
9617 sizeof_field(struct nft_regs, data))
9620 if (data != NULL && type != NFT_DATA_VALUE)
9626 int nft_parse_register_store(const struct nft_ctx *ctx,
9627 const struct nlattr *attr, u8 *dreg,
9628 const struct nft_data *data,
9629 enum nft_data_types type, unsigned int len)
9634 err = nft_parse_register(attr, ®);
9638 err = nft_validate_register_store(ctx, reg, data, type, len);
9645 EXPORT_SYMBOL_GPL(nft_parse_register_store);
9647 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9648 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
9649 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
9650 .len = NFT_CHAIN_MAXNAMELEN - 1 },
9651 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9654 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9655 struct nft_data_desc *desc, const struct nlattr *nla)
9657 u8 genmask = nft_genmask_next(ctx->net);
9658 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9659 struct nft_chain *chain;
9662 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9663 nft_verdict_policy, NULL);
9667 if (!tb[NFTA_VERDICT_CODE])
9669 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9671 switch (data->verdict.code) {
9673 switch (data->verdict.code & NF_VERDICT_MASK) {
9688 if (tb[NFTA_VERDICT_CHAIN]) {
9689 chain = nft_chain_lookup(ctx->net, ctx->table,
9690 tb[NFTA_VERDICT_CHAIN],
9692 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9693 chain = nft_chain_lookup_byid(ctx->net, ctx->table,
9694 tb[NFTA_VERDICT_CHAIN_ID]);
9696 return PTR_ERR(chain);
9702 return PTR_ERR(chain);
9703 if (nft_is_base_chain(chain))
9705 if (desc->flags & NFT_DATA_DESC_SETELEM &&
9706 chain->flags & NFT_CHAIN_BINDING)
9710 data->verdict.chain = chain;
9714 desc->len = sizeof(data->verdict);
9719 static void nft_verdict_uninit(const struct nft_data *data)
9721 struct nft_chain *chain;
9722 struct nft_rule *rule;
9724 switch (data->verdict.code) {
9727 chain = data->verdict.chain;
9730 if (!nft_chain_is_bound(chain))
9733 chain->table->use--;
9734 list_for_each_entry(rule, &chain->rules, list)
9737 nft_chain_del(chain);
9742 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
9744 struct nlattr *nest;
9746 nest = nla_nest_start_noflag(skb, type);
9748 goto nla_put_failure;
9750 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
9751 goto nla_put_failure;
9756 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
9758 goto nla_put_failure;
9760 nla_nest_end(skb, nest);
9767 static int nft_value_init(const struct nft_ctx *ctx,
9768 struct nft_data *data, struct nft_data_desc *desc,
9769 const struct nlattr *nla)
9776 if (len > desc->size)
9779 if (len != desc->len)
9785 nla_memcpy(data->data, nla, len);
9790 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
9793 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
9796 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
9797 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
9798 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
9802 * nft_data_init - parse nf_tables data netlink attributes
9804 * @ctx: context of the expression using the data
9805 * @data: destination struct nft_data
9806 * @desc: data description
9807 * @nla: netlink attribute containing data
9809 * Parse the netlink data attributes and initialize a struct nft_data.
9810 * The type and length of data are returned in the data description.
9812 * The caller can indicate that it only wants to accept data of type
9813 * NFT_DATA_VALUE by passing NULL for the ctx argument.
9815 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
9816 struct nft_data_desc *desc, const struct nlattr *nla)
9818 struct nlattr *tb[NFTA_DATA_MAX + 1];
9821 if (WARN_ON_ONCE(!desc->size))
9824 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
9825 nft_data_policy, NULL);
9829 if (tb[NFTA_DATA_VALUE]) {
9830 if (desc->type != NFT_DATA_VALUE)
9833 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
9834 } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
9835 if (desc->type != NFT_DATA_VERDICT)
9838 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
9845 EXPORT_SYMBOL_GPL(nft_data_init);
9848 * nft_data_release - release a nft_data item
9850 * @data: struct nft_data to release
9851 * @type: type of data
9853 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
9854 * all others need to be released by calling this function.
9856 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
9858 if (type < NFT_DATA_VERDICT)
9861 case NFT_DATA_VERDICT:
9862 return nft_verdict_uninit(data);
9867 EXPORT_SYMBOL_GPL(nft_data_release);
9869 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9870 enum nft_data_types type, unsigned int len)
9872 struct nlattr *nest;
9875 nest = nla_nest_start_noflag(skb, attr);
9880 case NFT_DATA_VALUE:
9881 err = nft_value_dump(skb, data, len);
9883 case NFT_DATA_VERDICT:
9884 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
9891 nla_nest_end(skb, nest);
9894 EXPORT_SYMBOL_GPL(nft_data_dump);
9896 int __nft_release_basechain(struct nft_ctx *ctx)
9898 struct nft_rule *rule, *nr;
9900 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9903 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
9904 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9905 list_del(&rule->list);
9907 nf_tables_rule_release(ctx, rule);
9909 nft_chain_del(ctx->chain);
9911 nf_tables_chain_destroy(ctx);
9915 EXPORT_SYMBOL_GPL(__nft_release_basechain);
9917 static void __nft_release_hook(struct net *net, struct nft_table *table)
9919 struct nft_flowtable *flowtable;
9920 struct nft_chain *chain;
9922 list_for_each_entry(chain, &table->chains, list)
9923 __nf_tables_unregister_hook(net, table, chain, true);
9924 list_for_each_entry(flowtable, &table->flowtables, list)
9925 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
9929 static void __nft_release_hooks(struct net *net)
9931 struct nftables_pernet *nft_net = nft_pernet(net);
9932 struct nft_table *table;
9934 list_for_each_entry(table, &nft_net->tables, list) {
9935 if (nft_table_has_owner(table))
9938 __nft_release_hook(net, table);
9942 static void __nft_release_table(struct net *net, struct nft_table *table)
9944 struct nft_flowtable *flowtable, *nf;
9945 struct nft_chain *chain, *nc;
9946 struct nft_object *obj, *ne;
9947 struct nft_rule *rule, *nr;
9948 struct nft_set *set, *ns;
9949 struct nft_ctx ctx = {
9951 .family = NFPROTO_NETDEV,
9954 ctx.family = table->family;
9956 list_for_each_entry(chain, &table->chains, list) {
9958 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
9959 list_del(&rule->list);
9961 nf_tables_rule_release(&ctx, rule);
9964 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
9965 list_del(&flowtable->list);
9967 nf_tables_flowtable_destroy(flowtable);
9969 list_for_each_entry_safe(set, ns, &table->sets, list) {
9970 list_del(&set->list);
9972 nft_set_destroy(&ctx, set);
9974 list_for_each_entry_safe(obj, ne, &table->objects, list) {
9977 nft_obj_destroy(&ctx, obj);
9979 list_for_each_entry_safe(chain, nc, &table->chains, list) {
9981 nft_chain_del(chain);
9983 nf_tables_chain_destroy(&ctx);
9985 nf_tables_table_destroy(&ctx);
9988 static void __nft_release_tables(struct net *net)
9990 struct nftables_pernet *nft_net = nft_pernet(net);
9991 struct nft_table *table, *nt;
9993 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
9994 if (nft_table_has_owner(table))
9997 list_del(&table->list);
9999 __nft_release_table(net, table);
10003 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
10006 struct nft_table *table, *to_delete[8];
10007 struct nftables_pernet *nft_net;
10008 struct netlink_notify *n = ptr;
10009 struct net *net = n->net;
10010 unsigned int deleted;
10011 bool restart = false;
10013 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
10014 return NOTIFY_DONE;
10016 nft_net = nft_pernet(net);
10018 mutex_lock(&nft_net->commit_mutex);
10020 list_for_each_entry(table, &nft_net->tables, list) {
10021 if (nft_table_has_owner(table) &&
10022 n->portid == table->nlpid) {
10023 __nft_release_hook(net, table);
10024 list_del_rcu(&table->list);
10025 to_delete[deleted++] = table;
10026 if (deleted >= ARRAY_SIZE(to_delete))
10031 restart = deleted >= ARRAY_SIZE(to_delete);
10034 __nft_release_table(net, to_delete[--deleted]);
10039 mutex_unlock(&nft_net->commit_mutex);
10041 return NOTIFY_DONE;
10044 static struct notifier_block nft_nl_notifier = {
10045 .notifier_call = nft_rcv_nl_event,
10048 static int __net_init nf_tables_init_net(struct net *net)
10050 struct nftables_pernet *nft_net = nft_pernet(net);
10052 INIT_LIST_HEAD(&nft_net->tables);
10053 INIT_LIST_HEAD(&nft_net->commit_list);
10054 INIT_LIST_HEAD(&nft_net->module_list);
10055 INIT_LIST_HEAD(&nft_net->notify_list);
10056 mutex_init(&nft_net->commit_mutex);
10057 nft_net->base_seq = 1;
10058 nft_net->validate_state = NFT_VALIDATE_SKIP;
10063 static void __net_exit nf_tables_pre_exit_net(struct net *net)
10065 struct nftables_pernet *nft_net = nft_pernet(net);
10067 mutex_lock(&nft_net->commit_mutex);
10068 __nft_release_hooks(net);
10069 mutex_unlock(&nft_net->commit_mutex);
10072 static void __net_exit nf_tables_exit_net(struct net *net)
10074 struct nftables_pernet *nft_net = nft_pernet(net);
10076 mutex_lock(&nft_net->commit_mutex);
10077 if (!list_empty(&nft_net->commit_list))
10078 __nf_tables_abort(net, NFNL_ABORT_NONE);
10079 __nft_release_tables(net);
10080 mutex_unlock(&nft_net->commit_mutex);
10081 WARN_ON_ONCE(!list_empty(&nft_net->tables));
10082 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
10083 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10086 static struct pernet_operations nf_tables_net_ops = {
10087 .init = nf_tables_init_net,
10088 .pre_exit = nf_tables_pre_exit_net,
10089 .exit = nf_tables_exit_net,
10090 .id = &nf_tables_net_id,
10091 .size = sizeof(struct nftables_pernet),
10094 static int __init nf_tables_module_init(void)
10098 err = register_pernet_subsys(&nf_tables_net_ops);
10102 err = nft_chain_filter_init();
10104 goto err_chain_filter;
10106 err = nf_tables_core_module_init();
10108 goto err_core_module;
10110 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10112 goto err_netdev_notifier;
10114 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10116 goto err_rht_objname;
10118 err = nft_offload_init();
10122 err = netlink_register_notifier(&nft_nl_notifier);
10124 goto err_netlink_notifier;
10127 err = nfnetlink_subsys_register(&nf_tables_subsys);
10129 goto err_nfnl_subsys;
10131 nft_chain_route_init();
10136 netlink_unregister_notifier(&nft_nl_notifier);
10137 err_netlink_notifier:
10138 nft_offload_exit();
10140 rhltable_destroy(&nft_objname_ht);
10142 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10143 err_netdev_notifier:
10144 nf_tables_core_module_exit();
10146 nft_chain_filter_fini();
10148 unregister_pernet_subsys(&nf_tables_net_ops);
10152 static void __exit nf_tables_module_exit(void)
10154 nfnetlink_subsys_unregister(&nf_tables_subsys);
10155 netlink_unregister_notifier(&nft_nl_notifier);
10156 nft_offload_exit();
10157 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10158 nft_chain_filter_fini();
10159 nft_chain_route_fini();
10160 unregister_pernet_subsys(&nf_tables_net_ops);
10161 cancel_work_sync(&trans_destroy_work);
10163 rhltable_destroy(&nft_objname_ht);
10164 nf_tables_core_module_exit();
10167 module_init(nf_tables_module_init);
10168 module_exit(nf_tables_module_exit);
10170 MODULE_LICENSE("GPL");
10171 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10172 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);