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-"))
27 #define NFT_SET_MAX_ANONLEN 16
29 unsigned int nf_tables_net_id __read_mostly;
31 static LIST_HEAD(nf_tables_expressions);
32 static LIST_HEAD(nf_tables_objects);
33 static LIST_HEAD(nf_tables_flowtables);
34 static LIST_HEAD(nf_tables_destroy_list);
35 static LIST_HEAD(nf_tables_gc_list);
36 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
37 static DEFINE_SPINLOCK(nf_tables_gc_list_lock);
40 NFT_VALIDATE_SKIP = 0,
45 static struct rhltable nft_objname_ht;
47 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
48 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
49 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
51 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
52 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
53 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
55 static const struct rhashtable_params nft_chain_ht_params = {
56 .head_offset = offsetof(struct nft_chain, rhlhead),
57 .key_offset = offsetof(struct nft_chain, name),
58 .hashfn = nft_chain_hash,
59 .obj_hashfn = nft_chain_hash_obj,
60 .obj_cmpfn = nft_chain_hash_cmp,
61 .automatic_shrinking = true,
64 static const struct rhashtable_params nft_objname_ht_params = {
65 .head_offset = offsetof(struct nft_object, rhlhead),
66 .key_offset = offsetof(struct nft_object, key),
67 .hashfn = nft_objname_hash,
68 .obj_hashfn = nft_objname_hash_obj,
69 .obj_cmpfn = nft_objname_hash_cmp,
70 .automatic_shrinking = true,
73 struct nft_audit_data {
74 struct nft_table *table;
77 struct list_head list;
80 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
81 [NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER,
82 [NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID,
83 [NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER,
84 [NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER,
85 [NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID,
86 [NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER,
87 [NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER,
88 [NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID,
89 [NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER,
90 [NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER,
91 [NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID,
92 [NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER,
93 [NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER,
94 [NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID,
95 [NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER,
96 [NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER,
97 [NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID,
98 [NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID,
99 [NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER,
100 [NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID,
101 [NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER,
102 [NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET,
103 [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
104 [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
105 [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
106 [NFT_MSG_GETSETELEM_RESET] = AUDIT_NFT_OP_SETELEM_RESET,
109 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
111 switch (table->validate_state) {
112 case NFT_VALIDATE_SKIP:
113 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
115 case NFT_VALIDATE_NEED:
117 case NFT_VALIDATE_DO:
118 if (new_validate_state == NFT_VALIDATE_NEED)
122 table->validate_state = new_validate_state;
124 static void nf_tables_trans_destroy_work(struct work_struct *w);
125 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
127 static void nft_trans_gc_work(struct work_struct *work);
128 static DECLARE_WORK(trans_gc_work, nft_trans_gc_work);
130 static void nft_ctx_init(struct nft_ctx *ctx,
132 const struct sk_buff *skb,
133 const struct nlmsghdr *nlh,
135 struct nft_table *table,
136 struct nft_chain *chain,
137 const struct nlattr * const *nla)
140 ctx->family = family;
145 ctx->portid = NETLINK_CB(skb).portid;
146 ctx->report = nlmsg_report(nlh);
147 ctx->flags = nlh->nlmsg_flags;
148 ctx->seq = nlh->nlmsg_seq;
151 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
152 int msg_type, u32 size, gfp_t gfp)
154 struct nft_trans *trans;
156 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
160 INIT_LIST_HEAD(&trans->list);
161 INIT_LIST_HEAD(&trans->binding_list);
162 trans->msg_type = msg_type;
168 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
169 int msg_type, u32 size)
171 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
174 static void nft_trans_list_del(struct nft_trans *trans)
176 list_del(&trans->list);
177 list_del(&trans->binding_list);
180 static void nft_trans_destroy(struct nft_trans *trans)
182 nft_trans_list_del(trans);
186 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
189 struct nftables_pernet *nft_net;
190 struct net *net = ctx->net;
191 struct nft_trans *trans;
193 if (!nft_set_is_anonymous(set))
196 nft_net = nft_pernet(net);
197 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
198 switch (trans->msg_type) {
200 if (nft_trans_set(trans) == set)
201 nft_trans_set_bound(trans) = bind;
203 case NFT_MSG_NEWSETELEM:
204 if (nft_trans_elem_set(trans) == set)
205 nft_trans_elem_set_bound(trans) = bind;
211 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
213 return __nft_set_trans_bind(ctx, set, true);
216 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
218 return __nft_set_trans_bind(ctx, set, false);
221 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
222 struct nft_chain *chain, bool bind)
224 struct nftables_pernet *nft_net;
225 struct net *net = ctx->net;
226 struct nft_trans *trans;
228 if (!nft_chain_binding(chain))
231 nft_net = nft_pernet(net);
232 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
233 switch (trans->msg_type) {
234 case NFT_MSG_NEWCHAIN:
235 if (nft_trans_chain(trans) == chain)
236 nft_trans_chain_bound(trans) = bind;
238 case NFT_MSG_NEWRULE:
239 if (trans->ctx.chain == chain)
240 nft_trans_rule_bound(trans) = bind;
246 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
247 struct nft_chain *chain)
249 __nft_chain_trans_bind(ctx, chain, true);
252 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
254 if (!nft_chain_binding(chain))
257 if (nft_chain_binding(ctx->chain))
263 if (!nft_use_inc(&chain->use))
267 nft_chain_trans_bind(ctx, chain);
272 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
274 __nft_chain_trans_bind(ctx, chain, false);
277 static int nft_netdev_register_hooks(struct net *net,
278 struct list_head *hook_list)
280 struct nft_hook *hook;
284 list_for_each_entry(hook, hook_list, list) {
285 err = nf_register_net_hook(net, &hook->ops);
294 list_for_each_entry(hook, hook_list, list) {
298 nf_unregister_net_hook(net, &hook->ops);
303 static void nft_netdev_unregister_hooks(struct net *net,
304 struct list_head *hook_list,
307 struct nft_hook *hook, *next;
309 list_for_each_entry_safe(hook, next, hook_list, list) {
310 nf_unregister_net_hook(net, &hook->ops);
311 if (release_netdev) {
312 list_del(&hook->list);
313 kfree_rcu(hook, rcu);
318 static int nf_tables_register_hook(struct net *net,
319 const struct nft_table *table,
320 struct nft_chain *chain)
322 struct nft_base_chain *basechain;
323 const struct nf_hook_ops *ops;
325 if (table->flags & NFT_TABLE_F_DORMANT ||
326 !nft_is_base_chain(chain))
329 basechain = nft_base_chain(chain);
330 ops = &basechain->ops;
332 if (basechain->type->ops_register)
333 return basechain->type->ops_register(net, ops);
335 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
336 return nft_netdev_register_hooks(net, &basechain->hook_list);
338 return nf_register_net_hook(net, &basechain->ops);
341 static void __nf_tables_unregister_hook(struct net *net,
342 const struct nft_table *table,
343 struct nft_chain *chain,
346 struct nft_base_chain *basechain;
347 const struct nf_hook_ops *ops;
349 if (table->flags & NFT_TABLE_F_DORMANT ||
350 !nft_is_base_chain(chain))
352 basechain = nft_base_chain(chain);
353 ops = &basechain->ops;
355 if (basechain->type->ops_unregister)
356 return basechain->type->ops_unregister(net, ops);
358 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
359 nft_netdev_unregister_hooks(net, &basechain->hook_list,
362 nf_unregister_net_hook(net, &basechain->ops);
365 static void nf_tables_unregister_hook(struct net *net,
366 const struct nft_table *table,
367 struct nft_chain *chain)
369 return __nf_tables_unregister_hook(net, table, chain, false);
372 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
374 struct nftables_pernet *nft_net = nft_pernet(net);
376 switch (trans->msg_type) {
378 if (!nft_trans_set_update(trans) &&
379 nft_set_is_anonymous(nft_trans_set(trans)))
380 list_add_tail(&trans->binding_list, &nft_net->binding_list);
382 case NFT_MSG_NEWCHAIN:
383 if (!nft_trans_chain_update(trans) &&
384 nft_chain_binding(nft_trans_chain(trans)))
385 list_add_tail(&trans->binding_list, &nft_net->binding_list);
389 list_add_tail(&trans->list, &nft_net->commit_list);
392 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
394 struct nft_trans *trans;
396 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
400 if (msg_type == NFT_MSG_NEWTABLE)
401 nft_activate_next(ctx->net, ctx->table);
403 nft_trans_commit_list_add_tail(ctx->net, trans);
407 static int nft_deltable(struct nft_ctx *ctx)
411 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
415 nft_deactivate_next(ctx->net, ctx->table);
419 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
421 struct nft_trans *trans;
423 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
425 return ERR_PTR(-ENOMEM);
427 if (msg_type == NFT_MSG_NEWCHAIN) {
428 nft_activate_next(ctx->net, ctx->chain);
430 if (ctx->nla[NFTA_CHAIN_ID]) {
431 nft_trans_chain_id(trans) =
432 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
435 nft_trans_chain(trans) = ctx->chain;
436 nft_trans_commit_list_add_tail(ctx->net, trans);
441 static int nft_delchain(struct nft_ctx *ctx)
443 struct nft_trans *trans;
445 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
447 return PTR_ERR(trans);
449 nft_use_dec(&ctx->table->use);
450 nft_deactivate_next(ctx->net, ctx->chain);
455 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
457 struct nft_expr *expr;
459 expr = nft_expr_first(rule);
460 while (nft_expr_more(rule, expr)) {
461 if (expr->ops->activate)
462 expr->ops->activate(ctx, expr);
464 expr = nft_expr_next(expr);
468 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
469 enum nft_trans_phase phase)
471 struct nft_expr *expr;
473 expr = nft_expr_first(rule);
474 while (nft_expr_more(rule, expr)) {
475 if (expr->ops->deactivate)
476 expr->ops->deactivate(ctx, expr, phase);
478 expr = nft_expr_next(expr);
483 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
485 /* You cannot delete the same rule twice */
486 if (nft_is_active_next(ctx->net, rule)) {
487 nft_deactivate_next(ctx->net, rule);
488 nft_use_dec(&ctx->chain->use);
494 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
495 struct nft_rule *rule)
497 struct nft_trans *trans;
499 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
503 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
504 nft_trans_rule_id(trans) =
505 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
507 nft_trans_rule(trans) = rule;
508 nft_trans_commit_list_add_tail(ctx->net, trans);
513 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
515 struct nft_flow_rule *flow;
516 struct nft_trans *trans;
519 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
523 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
524 flow = nft_flow_rule_create(ctx->net, rule);
526 nft_trans_destroy(trans);
527 return PTR_ERR(flow);
530 nft_trans_flow_rule(trans) = flow;
533 err = nf_tables_delrule_deactivate(ctx, rule);
535 nft_trans_destroy(trans);
538 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
543 static int nft_delrule_by_chain(struct nft_ctx *ctx)
545 struct nft_rule *rule;
548 list_for_each_entry(rule, &ctx->chain->rules, list) {
549 if (!nft_is_active_next(ctx->net, rule))
552 err = nft_delrule(ctx, rule);
559 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
561 const struct nft_set_desc *desc)
563 struct nft_trans *trans;
565 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
569 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
570 nft_trans_set_id(trans) =
571 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
572 nft_activate_next(ctx->net, set);
574 nft_trans_set(trans) = set;
576 nft_trans_set_update(trans) = true;
577 nft_trans_set_gc_int(trans) = desc->gc_int;
578 nft_trans_set_timeout(trans) = desc->timeout;
579 nft_trans_set_size(trans) = desc->size;
581 nft_trans_commit_list_add_tail(ctx->net, trans);
586 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
589 return __nft_trans_set_add(ctx, msg_type, set, NULL);
592 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
594 const struct nft_set_iter *iter,
595 struct nft_elem_priv *elem_priv)
597 nft_setelem_data_deactivate(ctx->net, set, elem_priv);
602 struct nft_set_elem_catchall {
603 struct list_head list;
605 struct nft_elem_priv *elem;
608 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
611 u8 genmask = nft_genmask_next(ctx->net);
612 struct nft_set_elem_catchall *catchall;
613 struct nft_set_ext *ext;
615 list_for_each_entry(catchall, &set->catchall_list, list) {
616 ext = nft_set_elem_ext(set, catchall->elem);
617 if (!nft_set_elem_active(ext, genmask))
620 nft_setelem_data_deactivate(ctx->net, set, catchall->elem);
625 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
627 struct nft_set_iter iter = {
628 .genmask = nft_genmask_next(ctx->net),
629 .fn = nft_mapelem_deactivate,
632 set->ops->walk(ctx, set, &iter);
633 WARN_ON_ONCE(iter.err);
635 nft_map_catchall_deactivate(ctx, set);
638 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
642 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
646 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
647 nft_map_deactivate(ctx, set);
649 nft_deactivate_next(ctx->net, set);
650 nft_use_dec(&ctx->table->use);
655 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
656 struct nft_object *obj)
658 struct nft_trans *trans;
660 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
664 if (msg_type == NFT_MSG_NEWOBJ)
665 nft_activate_next(ctx->net, obj);
667 nft_trans_obj(trans) = obj;
668 nft_trans_commit_list_add_tail(ctx->net, trans);
673 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
677 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
681 nft_deactivate_next(ctx->net, obj);
682 nft_use_dec(&ctx->table->use);
687 static struct nft_trans *
688 nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
689 struct nft_flowtable *flowtable)
691 struct nft_trans *trans;
693 trans = nft_trans_alloc(ctx, msg_type,
694 sizeof(struct nft_trans_flowtable));
696 return ERR_PTR(-ENOMEM);
698 if (msg_type == NFT_MSG_NEWFLOWTABLE)
699 nft_activate_next(ctx->net, flowtable);
701 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
702 nft_trans_flowtable(trans) = flowtable;
703 nft_trans_commit_list_add_tail(ctx->net, trans);
708 static int nft_delflowtable(struct nft_ctx *ctx,
709 struct nft_flowtable *flowtable)
711 struct nft_trans *trans;
713 trans = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
715 return PTR_ERR(trans);
717 nft_deactivate_next(ctx->net, flowtable);
718 nft_use_dec(&ctx->table->use);
723 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
727 for (i = track->regs[dreg].num_reg; i > 0; i--)
728 __nft_reg_track_cancel(track, dreg - i);
731 static void __nft_reg_track_update(struct nft_regs_track *track,
732 const struct nft_expr *expr,
735 track->regs[dreg].selector = expr;
736 track->regs[dreg].bitwise = NULL;
737 track->regs[dreg].num_reg = num_reg;
740 void nft_reg_track_update(struct nft_regs_track *track,
741 const struct nft_expr *expr, u8 dreg, u8 len)
743 unsigned int regcount;
746 __nft_reg_track_clobber(track, dreg);
748 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
749 for (i = 0; i < regcount; i++, dreg++)
750 __nft_reg_track_update(track, expr, dreg, i);
752 EXPORT_SYMBOL_GPL(nft_reg_track_update);
754 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
756 unsigned int regcount;
759 __nft_reg_track_clobber(track, dreg);
761 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
762 for (i = 0; i < regcount; i++, dreg++)
763 __nft_reg_track_cancel(track, dreg);
765 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
767 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
769 track->regs[dreg].selector = NULL;
770 track->regs[dreg].bitwise = NULL;
771 track->regs[dreg].num_reg = 0;
773 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
779 static struct nft_table *nft_table_lookup(const struct net *net,
780 const struct nlattr *nla,
781 u8 family, u8 genmask, u32 nlpid)
783 struct nftables_pernet *nft_net;
784 struct nft_table *table;
787 return ERR_PTR(-EINVAL);
789 nft_net = nft_pernet(net);
790 list_for_each_entry_rcu(table, &nft_net->tables, list,
791 lockdep_is_held(&nft_net->commit_mutex)) {
792 if (!nla_strcmp(nla, table->name) &&
793 table->family == family &&
794 nft_active_genmask(table, genmask)) {
795 if (nft_table_has_owner(table) &&
796 nlpid && table->nlpid != nlpid)
797 return ERR_PTR(-EPERM);
803 return ERR_PTR(-ENOENT);
806 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
807 const struct nlattr *nla,
808 int family, u8 genmask, u32 nlpid)
810 struct nftables_pernet *nft_net;
811 struct nft_table *table;
813 nft_net = nft_pernet(net);
814 list_for_each_entry(table, &nft_net->tables, list) {
815 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
816 table->family == family &&
817 nft_active_genmask(table, genmask)) {
818 if (nft_table_has_owner(table) &&
819 nlpid && table->nlpid != nlpid)
820 return ERR_PTR(-EPERM);
826 return ERR_PTR(-ENOENT);
829 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
831 return ++table->hgenerator;
834 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
836 static const struct nft_chain_type *
837 __nft_chain_type_get(u8 family, enum nft_chain_types type)
839 if (family >= NFPROTO_NUMPROTO ||
840 type >= NFT_CHAIN_T_MAX)
843 return chain_type[family][type];
846 static const struct nft_chain_type *
847 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
849 const struct nft_chain_type *type;
852 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
853 type = __nft_chain_type_get(family, i);
856 if (!nla_strcmp(nla, type->name))
862 struct nft_module_request {
863 struct list_head list;
864 char module[MODULE_NAME_LEN];
868 #ifdef CONFIG_MODULES
869 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
872 char module_name[MODULE_NAME_LEN];
873 struct nftables_pernet *nft_net;
874 struct nft_module_request *req;
879 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
881 if (ret >= MODULE_NAME_LEN)
884 nft_net = nft_pernet(net);
885 list_for_each_entry(req, &nft_net->module_list, list) {
886 if (!strcmp(req->module, module_name)) {
890 /* A request to load this module already exists. */
895 req = kmalloc(sizeof(*req), GFP_KERNEL);
900 strscpy(req->module, module_name, MODULE_NAME_LEN);
901 list_add_tail(&req->list, &nft_net->module_list);
905 EXPORT_SYMBOL_GPL(nft_request_module);
908 static void lockdep_nfnl_nft_mutex_not_held(void)
910 #ifdef CONFIG_PROVE_LOCKING
912 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
916 static const struct nft_chain_type *
917 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
918 u8 family, bool autoload)
920 const struct nft_chain_type *type;
922 type = __nf_tables_chain_type_lookup(nla, family);
926 lockdep_nfnl_nft_mutex_not_held();
927 #ifdef CONFIG_MODULES
929 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
931 (const char *)nla_data(nla)) == -EAGAIN)
932 return ERR_PTR(-EAGAIN);
935 return ERR_PTR(-ENOENT);
938 static __be16 nft_base_seq(const struct net *net)
940 struct nftables_pernet *nft_net = nft_pernet(net);
942 return htons(nft_net->base_seq & 0xffff);
945 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
946 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
947 .len = NFT_TABLE_MAXNAMELEN - 1 },
948 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
949 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
950 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
951 .len = NFT_USERDATA_MAXLEN }
954 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
955 u32 portid, u32 seq, int event, u32 flags,
956 int family, const struct nft_table *table)
958 struct nlmsghdr *nlh;
960 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
961 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
962 NFNETLINK_V0, nft_base_seq(net));
964 goto nla_put_failure;
966 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
967 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
968 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
970 goto nla_put_failure;
972 if (event == NFT_MSG_DELTABLE) {
977 if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
978 htonl(table->flags & NFT_TABLE_F_MASK)))
979 goto nla_put_failure;
981 if (nft_table_has_owner(table) &&
982 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
983 goto nla_put_failure;
986 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
987 goto nla_put_failure;
994 nlmsg_trim(skb, nlh);
998 struct nftnl_skb_parms {
1001 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
1003 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
1004 struct list_head *notify_list)
1006 NFT_CB(skb).report = report;
1007 list_add_tail(&skb->list, notify_list);
1010 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
1012 struct nftables_pernet *nft_net;
1013 struct sk_buff *skb;
1018 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1021 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1025 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1026 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1028 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
1029 event, flags, ctx->family, ctx->table);
1035 nft_net = nft_pernet(ctx->net);
1036 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1039 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1042 static int nf_tables_dump_tables(struct sk_buff *skb,
1043 struct netlink_callback *cb)
1045 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1046 struct nftables_pernet *nft_net;
1047 const struct nft_table *table;
1048 unsigned int idx = 0, s_idx = cb->args[0];
1049 struct net *net = sock_net(skb->sk);
1050 int family = nfmsg->nfgen_family;
1053 nft_net = nft_pernet(net);
1054 cb->seq = READ_ONCE(nft_net->base_seq);
1056 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1057 if (family != NFPROTO_UNSPEC && family != table->family)
1063 memset(&cb->args[1], 0,
1064 sizeof(cb->args) - sizeof(cb->args[0]));
1065 if (!nft_is_active(net, table))
1067 if (nf_tables_fill_table_info(skb, net,
1068 NETLINK_CB(cb->skb).portid,
1070 NFT_MSG_NEWTABLE, NLM_F_MULTI,
1071 table->family, table) < 0)
1074 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1084 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1085 const struct nlmsghdr *nlh,
1086 struct netlink_dump_control *c)
1090 if (!try_module_get(THIS_MODULE))
1094 err = netlink_dump_start(nlsk, skb, nlh, c);
1096 module_put(THIS_MODULE);
1101 /* called with rcu_read_lock held */
1102 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1103 const struct nlattr * const nla[])
1105 struct netlink_ext_ack *extack = info->extack;
1106 u8 genmask = nft_genmask_cur(info->net);
1107 u8 family = info->nfmsg->nfgen_family;
1108 const struct nft_table *table;
1109 struct net *net = info->net;
1110 struct sk_buff *skb2;
1113 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1114 struct netlink_dump_control c = {
1115 .dump = nf_tables_dump_tables,
1116 .module = THIS_MODULE,
1119 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1122 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1123 if (IS_ERR(table)) {
1124 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1125 return PTR_ERR(table);
1128 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1132 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1133 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1136 goto err_fill_table_info;
1138 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1140 err_fill_table_info:
1145 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1147 struct nft_chain *chain;
1150 list_for_each_entry(chain, &table->chains, list) {
1151 if (!nft_is_active_next(net, chain))
1153 if (!nft_is_base_chain(chain))
1156 if (cnt && i++ == cnt)
1159 nf_tables_unregister_hook(net, table, chain);
1163 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1165 struct nft_chain *chain;
1168 list_for_each_entry(chain, &table->chains, list) {
1169 if (!nft_is_active_next(net, chain))
1171 if (!nft_is_base_chain(chain))
1174 err = nf_tables_register_hook(net, table, chain);
1176 goto err_register_hooks;
1184 nft_table_disable(net, table, i);
1188 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1190 table->flags &= ~NFT_TABLE_F_DORMANT;
1191 nft_table_disable(net, table, 0);
1192 table->flags |= NFT_TABLE_F_DORMANT;
1195 #define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
1196 #define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
1197 #define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
1198 #define __NFT_TABLE_F_WAS_ORPHAN (__NFT_TABLE_F_INTERNAL << 2)
1199 #define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
1200 __NFT_TABLE_F_WAS_AWAKEN | \
1201 __NFT_TABLE_F_WAS_ORPHAN)
1203 static int nf_tables_updtable(struct nft_ctx *ctx)
1205 struct nft_trans *trans;
1209 if (!ctx->nla[NFTA_TABLE_FLAGS])
1212 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1213 if (flags & ~NFT_TABLE_F_MASK)
1216 if (flags == (ctx->table->flags & NFT_TABLE_F_MASK))
1219 if ((nft_table_has_owner(ctx->table) &&
1220 !(flags & NFT_TABLE_F_OWNER)) ||
1221 (flags & NFT_TABLE_F_OWNER &&
1222 !nft_table_is_orphan(ctx->table)))
1225 if ((flags ^ ctx->table->flags) & NFT_TABLE_F_PERSIST)
1228 /* No dormant off/on/off/on games in single transaction */
1229 if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
1232 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1233 sizeof(struct nft_trans_table));
1237 if ((flags & NFT_TABLE_F_DORMANT) &&
1238 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1239 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1240 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1241 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1242 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1243 ctx->table->flags & NFT_TABLE_F_DORMANT) {
1244 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1245 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1246 ret = nf_tables_table_enable(ctx->net, ctx->table);
1248 goto err_register_hooks;
1250 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1254 if ((flags & NFT_TABLE_F_OWNER) &&
1255 !nft_table_has_owner(ctx->table)) {
1256 ctx->table->nlpid = ctx->portid;
1257 ctx->table->flags |= NFT_TABLE_F_OWNER |
1258 __NFT_TABLE_F_WAS_ORPHAN;
1261 nft_trans_table_update(trans) = true;
1262 nft_trans_commit_list_add_tail(ctx->net, trans);
1267 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1268 nft_trans_destroy(trans);
1272 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1274 const char *name = data;
1276 return jhash(name, strlen(name), seed);
1279 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1281 const struct nft_chain *chain = data;
1283 return nft_chain_hash(chain->name, 0, seed);
1286 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1289 const struct nft_chain *chain = ptr;
1290 const char *name = arg->key;
1292 return strcmp(chain->name, name);
1295 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1297 const struct nft_object_hash_key *k = data;
1299 seed ^= hash_ptr(k->table, 32);
1301 return jhash(k->name, strlen(k->name), seed);
1304 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1306 const struct nft_object *obj = data;
1308 return nft_objname_hash(&obj->key, 0, seed);
1311 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1314 const struct nft_object_hash_key *k = arg->key;
1315 const struct nft_object *obj = ptr;
1317 if (obj->key.table != k->table)
1320 return strcmp(obj->key.name, k->name);
1323 static bool nft_supported_family(u8 family)
1326 #ifdef CONFIG_NF_TABLES_INET
1327 || family == NFPROTO_INET
1329 #ifdef CONFIG_NF_TABLES_IPV4
1330 || family == NFPROTO_IPV4
1332 #ifdef CONFIG_NF_TABLES_ARP
1333 || family == NFPROTO_ARP
1335 #ifdef CONFIG_NF_TABLES_NETDEV
1336 || family == NFPROTO_NETDEV
1338 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1339 || family == NFPROTO_BRIDGE
1341 #ifdef CONFIG_NF_TABLES_IPV6
1342 || family == NFPROTO_IPV6
1347 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1348 const struct nlattr * const nla[])
1350 struct nftables_pernet *nft_net = nft_pernet(info->net);
1351 struct netlink_ext_ack *extack = info->extack;
1352 u8 genmask = nft_genmask_next(info->net);
1353 u8 family = info->nfmsg->nfgen_family;
1354 struct net *net = info->net;
1355 const struct nlattr *attr;
1356 struct nft_table *table;
1361 if (!nft_supported_family(family))
1364 lockdep_assert_held(&nft_net->commit_mutex);
1365 attr = nla[NFTA_TABLE_NAME];
1366 table = nft_table_lookup(net, attr, family, genmask,
1367 NETLINK_CB(skb).portid);
1368 if (IS_ERR(table)) {
1369 if (PTR_ERR(table) != -ENOENT)
1370 return PTR_ERR(table);
1372 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1373 NL_SET_BAD_ATTR(extack, attr);
1376 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1379 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1381 return nf_tables_updtable(&ctx);
1384 if (nla[NFTA_TABLE_FLAGS]) {
1385 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1386 if (flags & ~NFT_TABLE_F_MASK)
1391 table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1395 table->validate_state = nft_net->validate_state;
1396 table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1397 if (table->name == NULL)
1400 if (nla[NFTA_TABLE_USERDATA]) {
1401 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1402 if (table->udata == NULL)
1403 goto err_table_udata;
1405 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1408 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1412 INIT_LIST_HEAD(&table->chains);
1413 INIT_LIST_HEAD(&table->sets);
1414 INIT_LIST_HEAD(&table->objects);
1415 INIT_LIST_HEAD(&table->flowtables);
1416 table->family = family;
1417 table->flags = flags;
1418 table->handle = ++nft_net->table_handle;
1419 if (table->flags & NFT_TABLE_F_OWNER)
1420 table->nlpid = NETLINK_CB(skb).portid;
1422 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1423 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1427 list_add_tail_rcu(&table->list, &nft_net->tables);
1430 rhltable_destroy(&table->chains_ht);
1432 kfree(table->udata);
1441 static int nft_flush_table(struct nft_ctx *ctx)
1443 struct nft_flowtable *flowtable, *nft;
1444 struct nft_chain *chain, *nc;
1445 struct nft_object *obj, *ne;
1446 struct nft_set *set, *ns;
1449 list_for_each_entry(chain, &ctx->table->chains, list) {
1450 if (!nft_is_active_next(ctx->net, chain))
1453 if (nft_chain_binding(chain))
1458 err = nft_delrule_by_chain(ctx);
1463 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1464 if (!nft_is_active_next(ctx->net, set))
1467 if (nft_set_is_anonymous(set))
1470 err = nft_delset(ctx, set);
1475 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1476 if (!nft_is_active_next(ctx->net, flowtable))
1479 err = nft_delflowtable(ctx, flowtable);
1484 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1485 if (!nft_is_active_next(ctx->net, obj))
1488 err = nft_delobj(ctx, obj);
1493 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1494 if (!nft_is_active_next(ctx->net, chain))
1497 if (nft_chain_binding(chain))
1502 err = nft_delchain(ctx);
1507 err = nft_deltable(ctx);
1512 static int nft_flush(struct nft_ctx *ctx, int family)
1514 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1515 const struct nlattr * const *nla = ctx->nla;
1516 struct nft_table *table, *nt;
1519 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1520 if (family != AF_UNSPEC && table->family != family)
1523 ctx->family = table->family;
1525 if (!nft_is_active_next(ctx->net, table))
1528 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1531 if (nla[NFTA_TABLE_NAME] &&
1532 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1537 err = nft_flush_table(ctx);
1545 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1546 const struct nlattr * const nla[])
1548 struct netlink_ext_ack *extack = info->extack;
1549 u8 genmask = nft_genmask_next(info->net);
1550 u8 family = info->nfmsg->nfgen_family;
1551 struct net *net = info->net;
1552 const struct nlattr *attr;
1553 struct nft_table *table;
1556 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1557 if (family == AF_UNSPEC ||
1558 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1559 return nft_flush(&ctx, family);
1561 if (nla[NFTA_TABLE_HANDLE]) {
1562 attr = nla[NFTA_TABLE_HANDLE];
1563 table = nft_table_lookup_byhandle(net, attr, family, genmask,
1564 NETLINK_CB(skb).portid);
1566 attr = nla[NFTA_TABLE_NAME];
1567 table = nft_table_lookup(net, attr, family, genmask,
1568 NETLINK_CB(skb).portid);
1571 if (IS_ERR(table)) {
1572 if (PTR_ERR(table) == -ENOENT &&
1573 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1576 NL_SET_BAD_ATTR(extack, attr);
1577 return PTR_ERR(table);
1580 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1584 ctx.family = family;
1587 return nft_flush_table(&ctx);
1590 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1592 if (WARN_ON(ctx->table->use > 0))
1595 rhltable_destroy(&ctx->table->chains_ht);
1596 kfree(ctx->table->name);
1597 kfree(ctx->table->udata);
1601 void nft_register_chain_type(const struct nft_chain_type *ctype)
1603 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1604 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1605 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1608 chain_type[ctype->family][ctype->type] = ctype;
1609 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1611 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1613 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1615 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1616 chain_type[ctype->family][ctype->type] = NULL;
1617 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1619 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1625 static struct nft_chain *
1626 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1628 struct nft_chain *chain;
1630 list_for_each_entry(chain, &table->chains, list) {
1631 if (chain->handle == handle &&
1632 nft_active_genmask(chain, genmask))
1636 return ERR_PTR(-ENOENT);
1639 static bool lockdep_commit_lock_is_held(const struct net *net)
1641 #ifdef CONFIG_PROVE_LOCKING
1642 struct nftables_pernet *nft_net = nft_pernet(net);
1644 return lockdep_is_held(&nft_net->commit_mutex);
1650 static struct nft_chain *nft_chain_lookup(struct net *net,
1651 struct nft_table *table,
1652 const struct nlattr *nla, u8 genmask)
1654 char search[NFT_CHAIN_MAXNAMELEN + 1];
1655 struct rhlist_head *tmp, *list;
1656 struct nft_chain *chain;
1659 return ERR_PTR(-EINVAL);
1661 nla_strscpy(search, nla, sizeof(search));
1663 WARN_ON(!rcu_read_lock_held() &&
1664 !lockdep_commit_lock_is_held(net));
1666 chain = ERR_PTR(-ENOENT);
1668 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1672 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1673 if (nft_active_genmask(chain, genmask))
1676 chain = ERR_PTR(-ENOENT);
1682 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1683 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1684 .len = NFT_TABLE_MAXNAMELEN - 1 },
1685 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1686 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1687 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1688 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1689 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1690 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1691 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1692 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1693 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1694 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1695 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1696 .len = NFT_USERDATA_MAXLEN },
1699 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1700 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1701 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1702 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1703 .len = IFNAMSIZ - 1 },
1706 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1708 struct nft_stats *cpu_stats, total;
1709 struct nlattr *nest;
1717 memset(&total, 0, sizeof(total));
1718 for_each_possible_cpu(cpu) {
1719 cpu_stats = per_cpu_ptr(stats, cpu);
1721 seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1722 pkts = cpu_stats->pkts;
1723 bytes = cpu_stats->bytes;
1724 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1726 total.bytes += bytes;
1728 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1730 goto nla_put_failure;
1732 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1733 NFTA_COUNTER_PAD) ||
1734 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1736 goto nla_put_failure;
1738 nla_nest_end(skb, nest);
1745 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1746 const struct nft_base_chain *basechain,
1747 const struct list_head *hook_list)
1749 const struct nf_hook_ops *ops = &basechain->ops;
1750 struct nft_hook *hook, *first = NULL;
1751 struct nlattr *nest, *nest_devs;
1754 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1756 goto nla_put_failure;
1757 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1758 goto nla_put_failure;
1759 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1760 goto nla_put_failure;
1762 if (nft_base_chain_netdev(family, ops->hooknum)) {
1763 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1765 goto nla_put_failure;
1768 hook_list = &basechain->hook_list;
1770 list_for_each_entry(hook, hook_list, list) {
1774 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1775 hook->ops.dev->name))
1776 goto nla_put_failure;
1779 nla_nest_end(skb, nest_devs);
1782 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1783 goto nla_put_failure;
1785 nla_nest_end(skb, nest);
1792 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1793 u32 portid, u32 seq, int event, u32 flags,
1794 int family, const struct nft_table *table,
1795 const struct nft_chain *chain,
1796 const struct list_head *hook_list)
1798 struct nlmsghdr *nlh;
1800 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1801 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1802 NFNETLINK_V0, nft_base_seq(net));
1804 goto nla_put_failure;
1806 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1807 nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1808 nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1810 goto nla_put_failure;
1812 if (event == NFT_MSG_DELCHAIN && !hook_list) {
1813 nlmsg_end(skb, nlh);
1817 if (nft_is_base_chain(chain)) {
1818 const struct nft_base_chain *basechain = nft_base_chain(chain);
1819 struct nft_stats __percpu *stats;
1821 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1822 goto nla_put_failure;
1824 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1825 htonl(basechain->policy)))
1826 goto nla_put_failure;
1828 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1829 goto nla_put_failure;
1831 stats = rcu_dereference_check(basechain->stats,
1832 lockdep_commit_lock_is_held(net));
1833 if (nft_dump_stats(skb, stats))
1834 goto nla_put_failure;
1838 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1839 goto nla_put_failure;
1841 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1842 goto nla_put_failure;
1845 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1846 goto nla_put_failure;
1848 nlmsg_end(skb, nlh);
1852 nlmsg_trim(skb, nlh);
1856 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1857 const struct list_head *hook_list)
1859 struct nftables_pernet *nft_net;
1860 struct sk_buff *skb;
1865 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1868 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1872 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1873 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1875 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1876 event, flags, ctx->family, ctx->table,
1877 ctx->chain, hook_list);
1883 nft_net = nft_pernet(ctx->net);
1884 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1887 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1890 static int nf_tables_dump_chains(struct sk_buff *skb,
1891 struct netlink_callback *cb)
1893 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1894 unsigned int idx = 0, s_idx = cb->args[0];
1895 struct net *net = sock_net(skb->sk);
1896 int family = nfmsg->nfgen_family;
1897 struct nftables_pernet *nft_net;
1898 const struct nft_table *table;
1899 const struct nft_chain *chain;
1902 nft_net = nft_pernet(net);
1903 cb->seq = READ_ONCE(nft_net->base_seq);
1905 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1906 if (family != NFPROTO_UNSPEC && family != table->family)
1909 list_for_each_entry_rcu(chain, &table->chains, list) {
1913 memset(&cb->args[1], 0,
1914 sizeof(cb->args) - sizeof(cb->args[0]));
1915 if (!nft_is_active(net, chain))
1917 if (nf_tables_fill_chain_info(skb, net,
1918 NETLINK_CB(cb->skb).portid,
1922 table->family, table,
1926 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1937 /* called with rcu_read_lock held */
1938 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1939 const struct nlattr * const nla[])
1941 struct netlink_ext_ack *extack = info->extack;
1942 u8 genmask = nft_genmask_cur(info->net);
1943 u8 family = info->nfmsg->nfgen_family;
1944 const struct nft_chain *chain;
1945 struct net *net = info->net;
1946 struct nft_table *table;
1947 struct sk_buff *skb2;
1950 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1951 struct netlink_dump_control c = {
1952 .dump = nf_tables_dump_chains,
1953 .module = THIS_MODULE,
1956 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1959 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1960 if (IS_ERR(table)) {
1961 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1962 return PTR_ERR(table);
1965 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1966 if (IS_ERR(chain)) {
1967 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1968 return PTR_ERR(chain);
1971 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1975 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1976 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1977 0, family, table, chain, NULL);
1979 goto err_fill_chain_info;
1981 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1983 err_fill_chain_info:
1988 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1989 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1990 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1993 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1995 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1996 struct nft_stats __percpu *newstats;
1997 struct nft_stats *stats;
2000 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
2001 nft_counter_policy, NULL);
2003 return ERR_PTR(err);
2005 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
2006 return ERR_PTR(-EINVAL);
2008 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
2009 if (newstats == NULL)
2010 return ERR_PTR(-ENOMEM);
2012 /* Restore old counters on this cpu, no problem. Per-cpu statistics
2013 * are not exposed to userspace.
2016 stats = this_cpu_ptr(newstats);
2017 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
2018 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
2024 static void nft_chain_stats_replace(struct nft_trans *trans)
2026 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
2028 if (!nft_trans_chain_stats(trans))
2031 nft_trans_chain_stats(trans) =
2032 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
2033 lockdep_commit_lock_is_held(trans->ctx.net));
2035 if (!nft_trans_chain_stats(trans))
2036 static_branch_inc(&nft_counters_enabled);
2039 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
2041 struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
2042 struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
2048 /* should be NULL either via abort or via successful commit */
2049 WARN_ON_ONCE(chain->blob_next);
2050 kvfree(chain->blob_next);
2053 void nf_tables_chain_destroy(struct nft_ctx *ctx)
2055 struct nft_chain *chain = ctx->chain;
2056 struct nft_hook *hook, *next;
2058 if (WARN_ON(chain->use > 0))
2061 /* no concurrent access possible anymore */
2062 nf_tables_chain_free_chain_rules(chain);
2064 if (nft_is_base_chain(chain)) {
2065 struct nft_base_chain *basechain = nft_base_chain(chain);
2067 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2068 list_for_each_entry_safe(hook, next,
2069 &basechain->hook_list, list) {
2070 list_del_rcu(&hook->list);
2071 kfree_rcu(hook, rcu);
2074 module_put(basechain->type->owner);
2075 if (rcu_access_pointer(basechain->stats)) {
2076 static_branch_dec(&nft_counters_enabled);
2077 free_percpu(rcu_dereference_raw(basechain->stats));
2080 kfree(chain->udata);
2084 kfree(chain->udata);
2089 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2090 const struct nlattr *attr)
2092 struct net_device *dev;
2093 char ifname[IFNAMSIZ];
2094 struct nft_hook *hook;
2097 hook = kzalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2100 goto err_hook_alloc;
2103 nla_strscpy(ifname, attr, IFNAMSIZ);
2104 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2105 * indirectly serializing all the other holders of the commit_mutex with
2108 dev = __dev_get_by_name(net, ifname);
2113 hook->ops.dev = dev;
2120 return ERR_PTR(err);
2123 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2124 const struct nft_hook *this)
2126 struct nft_hook *hook;
2128 list_for_each_entry(hook, hook_list, list) {
2129 if (this->ops.dev == hook->ops.dev)
2136 static int nf_tables_parse_netdev_hooks(struct net *net,
2137 const struct nlattr *attr,
2138 struct list_head *hook_list,
2139 struct netlink_ext_ack *extack)
2141 struct nft_hook *hook, *next;
2142 const struct nlattr *tmp;
2143 int rem, n = 0, err;
2145 nla_for_each_nested(tmp, attr, rem) {
2146 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2151 hook = nft_netdev_hook_alloc(net, tmp);
2153 NL_SET_BAD_ATTR(extack, tmp);
2154 err = PTR_ERR(hook);
2157 if (nft_hook_list_find(hook_list, hook)) {
2158 NL_SET_BAD_ATTR(extack, tmp);
2163 list_add_tail(&hook->list, hook_list);
2166 if (n == NFT_NETDEVICE_MAX) {
2175 list_for_each_entry_safe(hook, next, hook_list, list) {
2176 list_del(&hook->list);
2182 struct nft_chain_hook {
2185 const struct nft_chain_type *type;
2186 struct list_head list;
2189 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2190 struct list_head *hook_list,
2191 struct netlink_ext_ack *extack, u32 flags)
2193 struct nft_hook *hook;
2196 if (tb[NFTA_HOOK_DEV]) {
2197 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2199 NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2200 return PTR_ERR(hook);
2203 list_add_tail(&hook->list, hook_list);
2204 } else if (tb[NFTA_HOOK_DEVS]) {
2205 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2212 if (flags & NFT_CHAIN_HW_OFFLOAD &&
2213 list_empty(hook_list))
2219 static int nft_chain_parse_hook(struct net *net,
2220 struct nft_base_chain *basechain,
2221 const struct nlattr * const nla[],
2222 struct nft_chain_hook *hook, u8 family,
2223 u32 flags, struct netlink_ext_ack *extack)
2225 struct nftables_pernet *nft_net = nft_pernet(net);
2226 struct nlattr *ha[NFTA_HOOK_MAX + 1];
2227 const struct nft_chain_type *type;
2230 lockdep_assert_held(&nft_net->commit_mutex);
2231 lockdep_nfnl_nft_mutex_not_held();
2233 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2234 nla[NFTA_CHAIN_HOOK],
2235 nft_hook_policy, NULL);
2240 if (!ha[NFTA_HOOK_HOOKNUM] ||
2241 !ha[NFTA_HOOK_PRIORITY]) {
2242 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2246 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2247 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2249 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2253 if (nla[NFTA_CHAIN_TYPE]) {
2254 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2257 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2258 return PTR_ERR(type);
2261 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2264 if (type->type == NFT_CHAIN_T_NAT &&
2265 hook->priority <= NF_IP_PRI_CONNTRACK)
2268 if (ha[NFTA_HOOK_HOOKNUM]) {
2269 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2270 if (hook->num != basechain->ops.hooknum)
2273 if (ha[NFTA_HOOK_PRIORITY]) {
2274 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2275 if (hook->priority != basechain->ops.priority)
2279 if (nla[NFTA_CHAIN_TYPE]) {
2280 type = __nf_tables_chain_type_lookup(nla[NFTA_CHAIN_TYPE],
2283 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2287 type = basechain->type;
2291 if (!try_module_get(type->owner)) {
2292 if (nla[NFTA_CHAIN_TYPE])
2293 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2299 INIT_LIST_HEAD(&hook->list);
2300 if (nft_base_chain_netdev(family, hook->num)) {
2301 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2303 module_put(type->owner);
2306 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2307 module_put(type->owner);
2314 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2316 struct nft_hook *h, *next;
2318 list_for_each_entry_safe(h, next, &hook->list, list) {
2322 module_put(hook->type->owner);
2325 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2327 struct nft_rule_dp_last *lrule;
2329 BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2331 lrule = (struct nft_rule_dp_last *)ptr;
2332 lrule->end.is_last = 1;
2333 lrule->chain = chain;
2334 /* blob size does not include the trailer rule */
2337 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2340 struct nft_rule_blob *blob;
2345 size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2347 blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2352 nft_last_rule(chain, blob->data);
2357 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2358 const struct nft_chain_hook *hook,
2359 struct nft_chain *chain)
2362 ops->hooknum = hook->num;
2363 ops->priority = hook->priority;
2365 ops->hook = hook->type->hooks[ops->hooknum];
2366 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
2369 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2370 struct nft_chain_hook *hook, u32 flags)
2372 struct nft_chain *chain;
2375 basechain->type = hook->type;
2376 INIT_LIST_HEAD(&basechain->hook_list);
2377 chain = &basechain->chain;
2379 if (nft_base_chain_netdev(family, hook->num)) {
2380 list_splice_init(&hook->list, &basechain->hook_list);
2381 list_for_each_entry(h, &basechain->hook_list, list)
2382 nft_basechain_hook_init(&h->ops, family, hook, chain);
2384 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2386 chain->flags |= NFT_CHAIN_BASE | flags;
2387 basechain->policy = NF_ACCEPT;
2388 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2389 !nft_chain_offload_support(basechain)) {
2390 list_splice_init(&basechain->hook_list, &hook->list);
2394 flow_block_init(&basechain->flow_block);
2399 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2403 err = rhltable_insert_key(&table->chains_ht, chain->name,
2404 &chain->rhlhead, nft_chain_ht_params);
2408 list_add_tail_rcu(&chain->list, &table->chains);
2413 static u64 chain_id;
2415 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2416 u8 policy, u32 flags,
2417 struct netlink_ext_ack *extack)
2419 const struct nlattr * const *nla = ctx->nla;
2420 struct nft_table *table = ctx->table;
2421 struct nft_base_chain *basechain;
2422 struct net *net = ctx->net;
2423 char name[NFT_NAME_MAXLEN];
2424 struct nft_rule_blob *blob;
2425 struct nft_trans *trans;
2426 struct nft_chain *chain;
2429 if (nla[NFTA_CHAIN_HOOK]) {
2430 struct nft_stats __percpu *stats = NULL;
2431 struct nft_chain_hook hook = {};
2433 if (flags & NFT_CHAIN_BINDING)
2436 err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2441 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2442 if (basechain == NULL) {
2443 nft_chain_release_hook(&hook);
2446 chain = &basechain->chain;
2448 if (nla[NFTA_CHAIN_COUNTERS]) {
2449 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2450 if (IS_ERR(stats)) {
2451 nft_chain_release_hook(&hook);
2453 return PTR_ERR(stats);
2455 rcu_assign_pointer(basechain->stats, stats);
2458 err = nft_basechain_init(basechain, family, &hook, flags);
2460 nft_chain_release_hook(&hook);
2466 static_branch_inc(&nft_counters_enabled);
2468 if (flags & NFT_CHAIN_BASE)
2470 if (flags & NFT_CHAIN_HW_OFFLOAD)
2473 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2477 chain->flags = flags;
2481 INIT_LIST_HEAD(&chain->rules);
2482 chain->handle = nf_tables_alloc_handle(table);
2483 chain->table = table;
2485 if (nla[NFTA_CHAIN_NAME]) {
2486 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2488 if (!(flags & NFT_CHAIN_BINDING)) {
2490 goto err_destroy_chain;
2493 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2494 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2499 goto err_destroy_chain;
2502 if (nla[NFTA_CHAIN_USERDATA]) {
2503 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2504 if (chain->udata == NULL) {
2506 goto err_destroy_chain;
2508 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2511 blob = nf_tables_chain_alloc_rules(chain, 0);
2514 goto err_destroy_chain;
2517 RCU_INIT_POINTER(chain->blob_gen_0, blob);
2518 RCU_INIT_POINTER(chain->blob_gen_1, blob);
2520 if (!nft_use_inc(&table->use)) {
2522 goto err_destroy_chain;
2525 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2526 if (IS_ERR(trans)) {
2527 err = PTR_ERR(trans);
2531 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2532 if (nft_is_base_chain(chain))
2533 nft_trans_chain_policy(trans) = policy;
2535 err = nft_chain_add(table, chain);
2539 /* This must be LAST to ensure no packets are walking over this chain. */
2540 err = nf_tables_register_hook(net, table, chain);
2542 goto err_register_hook;
2547 nft_chain_del(chain);
2549 nft_trans_destroy(trans);
2551 nft_use_dec_restore(&table->use);
2553 nf_tables_chain_destroy(ctx);
2558 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2559 u32 flags, const struct nlattr *attr,
2560 struct netlink_ext_ack *extack)
2562 const struct nlattr * const *nla = ctx->nla;
2563 struct nft_base_chain *basechain = NULL;
2564 struct nft_table *table = ctx->table;
2565 struct nft_chain *chain = ctx->chain;
2566 struct nft_chain_hook hook = {};
2567 struct nft_stats *stats = NULL;
2568 struct nft_hook *h, *next;
2569 struct nf_hook_ops *ops;
2570 struct nft_trans *trans;
2571 bool unregister = false;
2574 if (chain->flags ^ flags)
2577 INIT_LIST_HEAD(&hook.list);
2579 if (nla[NFTA_CHAIN_HOOK]) {
2580 if (!nft_is_base_chain(chain)) {
2581 NL_SET_BAD_ATTR(extack, attr);
2585 basechain = nft_base_chain(chain);
2586 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2587 ctx->family, flags, extack);
2591 if (basechain->type != hook.type) {
2592 nft_chain_release_hook(&hook);
2593 NL_SET_BAD_ATTR(extack, attr);
2597 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2598 list_for_each_entry_safe(h, next, &hook.list, list) {
2599 h->ops.pf = basechain->ops.pf;
2600 h->ops.hooknum = basechain->ops.hooknum;
2601 h->ops.priority = basechain->ops.priority;
2602 h->ops.priv = basechain->ops.priv;
2603 h->ops.hook = basechain->ops.hook;
2605 if (nft_hook_list_find(&basechain->hook_list, h)) {
2611 ops = &basechain->ops;
2612 if (ops->hooknum != hook.num ||
2613 ops->priority != hook.priority) {
2614 nft_chain_release_hook(&hook);
2615 NL_SET_BAD_ATTR(extack, attr);
2621 if (nla[NFTA_CHAIN_HANDLE] &&
2622 nla[NFTA_CHAIN_NAME]) {
2623 struct nft_chain *chain2;
2625 chain2 = nft_chain_lookup(ctx->net, table,
2626 nla[NFTA_CHAIN_NAME], genmask);
2627 if (!IS_ERR(chain2)) {
2628 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2634 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2635 nft_is_base_chain(chain) &&
2636 !list_empty(&hook.list)) {
2637 basechain = nft_base_chain(chain);
2638 ops = &basechain->ops;
2640 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2641 err = nft_netdev_register_hooks(ctx->net, &hook.list);
2649 if (nla[NFTA_CHAIN_COUNTERS]) {
2650 if (!nft_is_base_chain(chain)) {
2655 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2656 if (IS_ERR(stats)) {
2657 err = PTR_ERR(stats);
2663 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2664 sizeof(struct nft_trans_chain));
2668 nft_trans_chain_stats(trans) = stats;
2669 nft_trans_chain_update(trans) = true;
2671 if (nla[NFTA_CHAIN_POLICY])
2672 nft_trans_chain_policy(trans) = policy;
2674 nft_trans_chain_policy(trans) = -1;
2676 if (nla[NFTA_CHAIN_HANDLE] &&
2677 nla[NFTA_CHAIN_NAME]) {
2678 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2679 struct nft_trans *tmp;
2683 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2688 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2689 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2690 tmp->ctx.table == table &&
2691 nft_trans_chain_update(tmp) &&
2692 nft_trans_chain_name(tmp) &&
2693 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2694 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2700 nft_trans_chain_name(trans) = name;
2703 nft_trans_basechain(trans) = basechain;
2704 INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2705 list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2706 if (nla[NFTA_CHAIN_HOOK])
2707 module_put(hook.type->owner);
2709 nft_trans_commit_list_add_tail(ctx->net, trans);
2717 if (nla[NFTA_CHAIN_HOOK]) {
2718 list_for_each_entry_safe(h, next, &hook.list, list) {
2720 nf_unregister_net_hook(ctx->net, &h->ops);
2724 module_put(hook.type->owner);
2730 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2731 const struct nft_table *table,
2732 const struct nlattr *nla, u8 genmask)
2734 struct nftables_pernet *nft_net = nft_pernet(net);
2735 u32 id = ntohl(nla_get_be32(nla));
2736 struct nft_trans *trans;
2738 list_for_each_entry(trans, &nft_net->commit_list, list) {
2739 struct nft_chain *chain = trans->ctx.chain;
2741 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2742 chain->table == table &&
2743 id == nft_trans_chain_id(trans) &&
2744 nft_active_genmask(chain, genmask))
2747 return ERR_PTR(-ENOENT);
2750 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2751 const struct nlattr * const nla[])
2753 struct nftables_pernet *nft_net = nft_pernet(info->net);
2754 struct netlink_ext_ack *extack = info->extack;
2755 u8 genmask = nft_genmask_next(info->net);
2756 u8 family = info->nfmsg->nfgen_family;
2757 struct nft_chain *chain = NULL;
2758 struct net *net = info->net;
2759 const struct nlattr *attr;
2760 struct nft_table *table;
2761 u8 policy = NF_ACCEPT;
2766 lockdep_assert_held(&nft_net->commit_mutex);
2768 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2769 NETLINK_CB(skb).portid);
2770 if (IS_ERR(table)) {
2771 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2772 return PTR_ERR(table);
2776 attr = nla[NFTA_CHAIN_NAME];
2778 if (nla[NFTA_CHAIN_HANDLE]) {
2779 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2780 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2781 if (IS_ERR(chain)) {
2782 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2783 return PTR_ERR(chain);
2785 attr = nla[NFTA_CHAIN_HANDLE];
2786 } else if (nla[NFTA_CHAIN_NAME]) {
2787 chain = nft_chain_lookup(net, table, attr, genmask);
2788 if (IS_ERR(chain)) {
2789 if (PTR_ERR(chain) != -ENOENT) {
2790 NL_SET_BAD_ATTR(extack, attr);
2791 return PTR_ERR(chain);
2795 } else if (!nla[NFTA_CHAIN_ID]) {
2799 if (nla[NFTA_CHAIN_POLICY]) {
2800 if (chain != NULL &&
2801 !nft_is_base_chain(chain)) {
2802 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2806 if (chain == NULL &&
2807 nla[NFTA_CHAIN_HOOK] == NULL) {
2808 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2812 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2822 if (nla[NFTA_CHAIN_FLAGS])
2823 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2825 flags = chain->flags;
2827 if (flags & ~NFT_CHAIN_FLAGS)
2830 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2832 if (chain != NULL) {
2833 if (chain->flags & NFT_CHAIN_BINDING)
2836 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2837 NL_SET_BAD_ATTR(extack, attr);
2840 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2843 flags |= chain->flags & NFT_CHAIN_BASE;
2844 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2848 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2851 static int nft_delchain_hook(struct nft_ctx *ctx,
2852 struct nft_base_chain *basechain,
2853 struct netlink_ext_ack *extack)
2855 const struct nft_chain *chain = &basechain->chain;
2856 const struct nlattr * const *nla = ctx->nla;
2857 struct nft_chain_hook chain_hook = {};
2858 struct nft_hook *this, *hook;
2859 LIST_HEAD(chain_del_list);
2860 struct nft_trans *trans;
2863 err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2864 ctx->family, chain->flags, extack);
2868 list_for_each_entry(this, &chain_hook.list, list) {
2869 hook = nft_hook_list_find(&basechain->hook_list, this);
2872 goto err_chain_del_hook;
2874 list_move(&hook->list, &chain_del_list);
2877 trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2878 sizeof(struct nft_trans_chain));
2881 goto err_chain_del_hook;
2884 nft_trans_basechain(trans) = basechain;
2885 nft_trans_chain_update(trans) = true;
2886 INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2887 list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2888 nft_chain_release_hook(&chain_hook);
2890 nft_trans_commit_list_add_tail(ctx->net, trans);
2895 list_splice(&chain_del_list, &basechain->hook_list);
2896 nft_chain_release_hook(&chain_hook);
2901 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2902 const struct nlattr * const nla[])
2904 struct netlink_ext_ack *extack = info->extack;
2905 u8 genmask = nft_genmask_next(info->net);
2906 u8 family = info->nfmsg->nfgen_family;
2907 struct net *net = info->net;
2908 const struct nlattr *attr;
2909 struct nft_table *table;
2910 struct nft_chain *chain;
2911 struct nft_rule *rule;
2917 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2918 NETLINK_CB(skb).portid);
2919 if (IS_ERR(table)) {
2920 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2921 return PTR_ERR(table);
2924 if (nla[NFTA_CHAIN_HANDLE]) {
2925 attr = nla[NFTA_CHAIN_HANDLE];
2926 handle = be64_to_cpu(nla_get_be64(attr));
2927 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2929 attr = nla[NFTA_CHAIN_NAME];
2930 chain = nft_chain_lookup(net, table, attr, genmask);
2932 if (IS_ERR(chain)) {
2933 if (PTR_ERR(chain) == -ENOENT &&
2934 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2937 NL_SET_BAD_ATTR(extack, attr);
2938 return PTR_ERR(chain);
2941 if (nft_chain_binding(chain))
2944 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2946 if (nla[NFTA_CHAIN_HOOK]) {
2947 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2950 if (nft_is_base_chain(chain)) {
2951 struct nft_base_chain *basechain = nft_base_chain(chain);
2953 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2954 return nft_delchain_hook(&ctx, basechain, extack);
2958 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2963 list_for_each_entry(rule, &chain->rules, list) {
2964 if (!nft_is_active_next(net, rule))
2968 err = nft_delrule(&ctx, rule);
2973 /* There are rules and elements that are still holding references to us,
2974 * we cannot do a recursive removal in this case.
2977 NL_SET_BAD_ATTR(extack, attr);
2981 return nft_delchain(&ctx);
2989 * nft_register_expr - register nf_tables expr type
2992 * Registers the expr type for use with nf_tables. Returns zero on
2993 * success or a negative errno code otherwise.
2995 int nft_register_expr(struct nft_expr_type *type)
2997 if (WARN_ON_ONCE(type->maxattr > NFT_EXPR_MAXATTR))
3000 nfnl_lock(NFNL_SUBSYS_NFTABLES);
3001 if (type->family == NFPROTO_UNSPEC)
3002 list_add_tail_rcu(&type->list, &nf_tables_expressions);
3004 list_add_rcu(&type->list, &nf_tables_expressions);
3005 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3008 EXPORT_SYMBOL_GPL(nft_register_expr);
3011 * nft_unregister_expr - unregister nf_tables expr type
3014 * Unregisters the expr typefor use with nf_tables.
3016 void nft_unregister_expr(struct nft_expr_type *type)
3018 nfnl_lock(NFNL_SUBSYS_NFTABLES);
3019 list_del_rcu(&type->list);
3020 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3022 EXPORT_SYMBOL_GPL(nft_unregister_expr);
3024 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
3027 const struct nft_expr_type *type, *candidate = NULL;
3029 list_for_each_entry(type, &nf_tables_expressions, list) {
3030 if (!nla_strcmp(nla, type->name)) {
3031 if (!type->family && !candidate)
3033 else if (type->family == family)
3040 #ifdef CONFIG_MODULES
3041 static int nft_expr_type_request_module(struct net *net, u8 family,
3044 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3045 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3052 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3056 const struct nft_expr_type *type;
3059 return ERR_PTR(-EINVAL);
3061 type = __nft_expr_type_get(family, nla);
3062 if (type != NULL && try_module_get(type->owner))
3065 lockdep_nfnl_nft_mutex_not_held();
3066 #ifdef CONFIG_MODULES
3068 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3069 return ERR_PTR(-EAGAIN);
3071 if (nft_request_module(net, "nft-expr-%.*s",
3073 (char *)nla_data(nla)) == -EAGAIN)
3074 return ERR_PTR(-EAGAIN);
3077 return ERR_PTR(-ENOENT);
3080 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3081 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
3082 .len = NFT_MODULE_AUTOLOAD_LIMIT },
3083 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
3086 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3087 const struct nft_expr *expr, bool reset)
3089 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3090 goto nla_put_failure;
3092 if (expr->ops->dump) {
3093 struct nlattr *data = nla_nest_start_noflag(skb,
3096 goto nla_put_failure;
3097 if (expr->ops->dump(skb, expr, reset) < 0)
3098 goto nla_put_failure;
3099 nla_nest_end(skb, data);
3108 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3109 const struct nft_expr *expr, bool reset)
3111 struct nlattr *nest;
3113 nest = nla_nest_start_noflag(skb, attr);
3115 goto nla_put_failure;
3116 if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3117 goto nla_put_failure;
3118 nla_nest_end(skb, nest);
3125 struct nft_expr_info {
3126 const struct nft_expr_ops *ops;
3127 const struct nlattr *attr;
3128 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
3131 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3132 const struct nlattr *nla,
3133 struct nft_expr_info *info)
3135 const struct nft_expr_type *type;
3136 const struct nft_expr_ops *ops;
3137 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3140 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3141 nft_expr_policy, NULL);
3145 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3147 return PTR_ERR(type);
3149 if (tb[NFTA_EXPR_DATA]) {
3150 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3152 type->policy, NULL);
3156 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3158 if (type->select_ops != NULL) {
3159 ops = type->select_ops(ctx,
3160 (const struct nlattr * const *)info->tb);
3163 #ifdef CONFIG_MODULES
3165 if (nft_expr_type_request_module(ctx->net,
3167 tb[NFTA_EXPR_NAME]) != -EAGAIN)
3181 module_put(type->owner);
3185 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3186 struct nft_expr_info *info)
3188 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3189 const struct nft_expr_type *type;
3192 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3193 nft_expr_policy, NULL);
3197 if (!tb[NFTA_EXPR_DATA] || !tb[NFTA_EXPR_NAME])
3200 type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3204 if (!type->inner_ops)
3207 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3209 type->policy, NULL);
3214 info->ops = type->inner_ops;
3222 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3223 const struct nft_expr_info *expr_info,
3224 struct nft_expr *expr)
3226 const struct nft_expr_ops *ops = expr_info->ops;
3231 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3242 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3243 struct nft_expr *expr)
3245 const struct nft_expr_type *type = expr->ops->type;
3247 if (expr->ops->destroy)
3248 expr->ops->destroy(ctx, expr);
3249 module_put(type->owner);
3252 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3253 const struct nlattr *nla)
3255 struct nft_expr_info expr_info;
3256 struct nft_expr *expr;
3257 struct module *owner;
3260 err = nf_tables_expr_parse(ctx, nla, &expr_info);
3262 goto err_expr_parse;
3265 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3266 goto err_expr_stateful;
3269 expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3271 goto err_expr_stateful;
3273 err = nf_tables_newexpr(ctx, &expr_info, expr);
3281 owner = expr_info.ops->type->owner;
3282 if (expr_info.ops->type->release_ops)
3283 expr_info.ops->type->release_ops(expr_info.ops);
3287 return ERR_PTR(err);
3290 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3294 if (WARN_ON_ONCE(!src->ops->clone))
3297 dst->ops = src->ops;
3298 err = src->ops->clone(dst, src);
3302 __module_get(src->ops->type->owner);
3307 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3309 nf_tables_expr_destroy(ctx, expr);
3317 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3320 struct nft_rule *rule;
3322 // FIXME: this sucks
3323 list_for_each_entry_rcu(rule, &chain->rules, list) {
3324 if (handle == rule->handle)
3328 return ERR_PTR(-ENOENT);
3331 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3332 const struct nlattr *nla)
3335 return ERR_PTR(-EINVAL);
3337 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3340 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3341 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
3342 .len = NFT_TABLE_MAXNAMELEN - 1 },
3343 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
3344 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3345 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
3346 [NFTA_RULE_EXPRESSIONS] = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
3347 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
3348 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
3349 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
3350 .len = NFT_USERDATA_MAXLEN },
3351 [NFTA_RULE_ID] = { .type = NLA_U32 },
3352 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3353 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
3356 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3357 u32 portid, u32 seq, int event,
3358 u32 flags, int family,
3359 const struct nft_table *table,
3360 const struct nft_chain *chain,
3361 const struct nft_rule *rule, u64 handle,
3364 struct nlmsghdr *nlh;
3365 const struct nft_expr *expr, *next;
3366 struct nlattr *list;
3367 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3369 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3372 goto nla_put_failure;
3374 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3375 goto nla_put_failure;
3376 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3377 goto nla_put_failure;
3378 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3380 goto nla_put_failure;
3382 if (event != NFT_MSG_DELRULE && handle) {
3383 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3385 goto nla_put_failure;
3388 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3389 nft_flow_rule_stats(chain, rule);
3391 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3393 goto nla_put_failure;
3394 nft_rule_for_each_expr(expr, next, rule) {
3395 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3396 goto nla_put_failure;
3398 nla_nest_end(skb, list);
3401 struct nft_userdata *udata = nft_userdata(rule);
3402 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3404 goto nla_put_failure;
3407 nlmsg_end(skb, nlh);
3411 nlmsg_trim(skb, nlh);
3415 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3416 const struct nft_rule *rule, int event)
3418 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3419 const struct nft_rule *prule;
3420 struct sk_buff *skb;
3426 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3429 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3433 if (event == NFT_MSG_NEWRULE &&
3434 !list_is_first(&rule->list, &ctx->chain->rules) &&
3435 !list_is_last(&rule->list, &ctx->chain->rules)) {
3436 prule = list_prev_entry(rule, list);
3437 handle = prule->handle;
3439 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3440 flags |= NLM_F_APPEND;
3441 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3442 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3444 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3445 event, flags, ctx->family, ctx->table,
3446 ctx->chain, rule, handle, false);
3452 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3455 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3458 static void audit_log_rule_reset(const struct nft_table *table,
3459 unsigned int base_seq,
3460 unsigned int nentries)
3462 char *buf = kasprintf(GFP_ATOMIC, "%s:%u",
3463 table->name, base_seq);
3465 audit_log_nfcfg(buf, table->family, nentries,
3466 AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3470 struct nft_rule_dump_ctx {
3477 static int __nf_tables_dump_rules(struct sk_buff *skb,
3479 struct netlink_callback *cb,
3480 const struct nft_table *table,
3481 const struct nft_chain *chain)
3483 struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3484 struct net *net = sock_net(skb->sk);
3485 const struct nft_rule *rule, *prule;
3486 unsigned int entries = 0;
3491 list_for_each_entry_rcu(rule, &chain->rules, list) {
3492 if (!nft_is_active(net, rule))
3494 if (*idx < ctx->s_idx)
3497 handle = prule->handle;
3501 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3504 NLM_F_MULTI | NLM_F_APPEND,
3506 table, chain, rule, handle, ctx->reset) < 0) {
3511 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3518 if (ctx->reset && entries)
3519 audit_log_rule_reset(table, cb->seq, entries);
3524 static int nf_tables_dump_rules(struct sk_buff *skb,
3525 struct netlink_callback *cb)
3527 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3528 struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3529 struct nft_table *table;
3530 const struct nft_chain *chain;
3531 unsigned int idx = 0;
3532 struct net *net = sock_net(skb->sk);
3533 int family = nfmsg->nfgen_family;
3534 struct nftables_pernet *nft_net;
3537 nft_net = nft_pernet(net);
3538 cb->seq = READ_ONCE(nft_net->base_seq);
3540 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3541 if (family != NFPROTO_UNSPEC && family != table->family)
3544 if (ctx->table && strcmp(ctx->table, table->name) != 0)
3547 if (ctx->table && ctx->chain) {
3548 struct rhlist_head *list, *tmp;
3550 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3551 nft_chain_ht_params);
3555 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3556 if (!nft_is_active(net, chain))
3558 __nf_tables_dump_rules(skb, &idx,
3565 list_for_each_entry_rcu(chain, &table->chains, list) {
3566 if (__nf_tables_dump_rules(skb, &idx,
3581 static int nf_tables_dumpreset_rules(struct sk_buff *skb,
3582 struct netlink_callback *cb)
3584 struct nftables_pernet *nft_net = nft_pernet(sock_net(skb->sk));
3587 /* Mutex is held is to prevent that two concurrent dump-and-reset calls
3588 * do not underrun counters and quotas. The commit_mutex is used for
3589 * the lack a better lock, this is not transaction path.
3591 mutex_lock(&nft_net->commit_mutex);
3592 ret = nf_tables_dump_rules(skb, cb);
3593 mutex_unlock(&nft_net->commit_mutex);
3598 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3600 struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3601 const struct nlattr * const *nla = cb->data;
3603 BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
3605 if (nla[NFTA_RULE_TABLE]) {
3606 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE], GFP_ATOMIC);
3610 if (nla[NFTA_RULE_CHAIN]) {
3611 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN], GFP_ATOMIC);
3620 static int nf_tables_dumpreset_rules_start(struct netlink_callback *cb)
3622 struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3626 return nf_tables_dump_rules_start(cb);
3629 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3631 struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3638 /* called with rcu_read_lock held */
3639 static struct sk_buff *
3640 nf_tables_getrule_single(u32 portid, const struct nfnl_info *info,
3641 const struct nlattr * const nla[], bool reset)
3643 struct netlink_ext_ack *extack = info->extack;
3644 u8 genmask = nft_genmask_cur(info->net);
3645 u8 family = info->nfmsg->nfgen_family;
3646 const struct nft_chain *chain;
3647 const struct nft_rule *rule;
3648 struct net *net = info->net;
3649 struct nft_table *table;
3650 struct sk_buff *skb2;
3653 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3654 if (IS_ERR(table)) {
3655 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3656 return ERR_CAST(table);
3659 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3660 if (IS_ERR(chain)) {
3661 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3662 return ERR_CAST(chain);
3665 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3667 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3668 return ERR_CAST(rule);
3671 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3673 return ERR_PTR(-ENOMEM);
3675 err = nf_tables_fill_rule_info(skb2, net, portid,
3676 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3677 family, table, chain, rule, 0, reset);
3680 return ERR_PTR(err);
3686 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3687 const struct nlattr * const nla[])
3689 u32 portid = NETLINK_CB(skb).portid;
3690 struct net *net = info->net;
3691 struct sk_buff *skb2;
3693 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3694 struct netlink_dump_control c = {
3695 .start= nf_tables_dump_rules_start,
3696 .dump = nf_tables_dump_rules,
3697 .done = nf_tables_dump_rules_done,
3698 .module = THIS_MODULE,
3699 .data = (void *)nla,
3702 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3705 skb2 = nf_tables_getrule_single(portid, info, nla, false);
3707 return PTR_ERR(skb2);
3709 return nfnetlink_unicast(skb2, net, portid);
3712 static int nf_tables_getrule_reset(struct sk_buff *skb,
3713 const struct nfnl_info *info,
3714 const struct nlattr * const nla[])
3716 struct nftables_pernet *nft_net = nft_pernet(info->net);
3717 u32 portid = NETLINK_CB(skb).portid;
3718 struct net *net = info->net;
3719 struct sk_buff *skb2;
3722 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3723 struct netlink_dump_control c = {
3724 .start= nf_tables_dumpreset_rules_start,
3725 .dump = nf_tables_dumpreset_rules,
3726 .done = nf_tables_dump_rules_done,
3727 .module = THIS_MODULE,
3728 .data = (void *)nla,
3731 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3734 if (!try_module_get(THIS_MODULE))
3737 mutex_lock(&nft_net->commit_mutex);
3738 skb2 = nf_tables_getrule_single(portid, info, nla, true);
3739 mutex_unlock(&nft_net->commit_mutex);
3741 module_put(THIS_MODULE);
3744 return PTR_ERR(skb2);
3746 buf = kasprintf(GFP_ATOMIC, "%.*s:%u",
3747 nla_len(nla[NFTA_RULE_TABLE]),
3748 (char *)nla_data(nla[NFTA_RULE_TABLE]),
3750 audit_log_nfcfg(buf, info->nfmsg->nfgen_family, 1,
3751 AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3754 return nfnetlink_unicast(skb2, net, portid);
3757 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3759 struct nft_expr *expr, *next;
3762 * Careful: some expressions might not be initialized in case this
3763 * is called on error from nf_tables_newrule().
3765 expr = nft_expr_first(rule);
3766 while (nft_expr_more(rule, expr)) {
3767 next = nft_expr_next(expr);
3768 nf_tables_expr_destroy(ctx, expr);
3774 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3776 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3777 nf_tables_rule_destroy(ctx, rule);
3780 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3782 struct nft_expr *expr, *last;
3783 const struct nft_data *data;
3784 struct nft_rule *rule;
3787 if (ctx->level == NFT_JUMP_STACK_SIZE)
3790 list_for_each_entry(rule, &chain->rules, list) {
3791 if (fatal_signal_pending(current))
3794 if (!nft_is_active_next(ctx->net, rule))
3797 nft_rule_for_each_expr(expr, last, rule) {
3798 if (!expr->ops->validate)
3801 err = expr->ops->validate(ctx, expr, &data);
3809 EXPORT_SYMBOL_GPL(nft_chain_validate);
3811 static int nft_table_validate(struct net *net, const struct nft_table *table)
3813 struct nft_chain *chain;
3814 struct nft_ctx ctx = {
3816 .family = table->family,
3820 list_for_each_entry(chain, &table->chains, list) {
3821 if (!nft_is_base_chain(chain))
3825 err = nft_chain_validate(&ctx, chain);
3835 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3836 const struct nft_set_iter *iter,
3837 struct nft_elem_priv *elem_priv)
3839 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
3840 struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3841 const struct nft_data *data;
3844 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3845 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3848 data = nft_set_ext_data(ext);
3849 switch (data->verdict.code) {
3853 err = nft_chain_validate(ctx, data->verdict.chain);
3865 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3867 u8 genmask = nft_genmask_next(ctx->net);
3868 struct nft_set_elem_catchall *catchall;
3869 struct nft_set_ext *ext;
3872 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3873 ext = nft_set_elem_ext(set, catchall->elem);
3874 if (!nft_set_elem_active(ext, genmask))
3877 ret = nft_setelem_validate(ctx, set, NULL, catchall->elem);
3885 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3886 const struct nft_chain *chain,
3887 const struct nlattr *nla);
3889 #define NFT_RULE_MAXEXPRS 128
3891 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3892 const struct nlattr * const nla[])
3894 struct nftables_pernet *nft_net = nft_pernet(info->net);
3895 struct netlink_ext_ack *extack = info->extack;
3896 unsigned int size, i, n, ulen = 0, usize = 0;
3897 u8 genmask = nft_genmask_next(info->net);
3898 struct nft_rule *rule, *old_rule = NULL;
3899 struct nft_expr_info *expr_info = NULL;
3900 u8 family = info->nfmsg->nfgen_family;
3901 struct nft_flow_rule *flow = NULL;
3902 struct net *net = info->net;
3903 struct nft_userdata *udata;
3904 struct nft_table *table;
3905 struct nft_chain *chain;
3906 struct nft_trans *trans;
3907 u64 handle, pos_handle;
3908 struct nft_expr *expr;
3913 lockdep_assert_held(&nft_net->commit_mutex);
3915 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3916 NETLINK_CB(skb).portid);
3917 if (IS_ERR(table)) {
3918 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3919 return PTR_ERR(table);
3922 if (nla[NFTA_RULE_CHAIN]) {
3923 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3925 if (IS_ERR(chain)) {
3926 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3927 return PTR_ERR(chain);
3930 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3931 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3933 if (IS_ERR(chain)) {
3934 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3935 return PTR_ERR(chain);
3941 if (nft_chain_is_bound(chain))
3944 if (nla[NFTA_RULE_HANDLE]) {
3945 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3946 rule = __nft_rule_lookup(chain, handle);
3948 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3949 return PTR_ERR(rule);
3952 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3953 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3956 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3961 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3962 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3964 handle = nf_tables_alloc_handle(table);
3966 if (nla[NFTA_RULE_POSITION]) {
3967 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3968 old_rule = __nft_rule_lookup(chain, pos_handle);
3969 if (IS_ERR(old_rule)) {
3970 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3971 return PTR_ERR(old_rule);
3973 } else if (nla[NFTA_RULE_POSITION_ID]) {
3974 old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3975 if (IS_ERR(old_rule)) {
3976 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3977 return PTR_ERR(old_rule);
3982 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3986 if (nla[NFTA_RULE_EXPRESSIONS]) {
3987 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3988 sizeof(struct nft_expr_info),
3993 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3995 if (nla_type(tmp) != NFTA_LIST_ELEM)
3996 goto err_release_expr;
3997 if (n == NFT_RULE_MAXEXPRS)
3998 goto err_release_expr;
3999 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
4001 NL_SET_BAD_ATTR(extack, tmp);
4002 goto err_release_expr;
4004 size += expr_info[n].ops->size;
4008 /* Check for overflow of dlen field */
4010 if (size >= 1 << 12)
4011 goto err_release_expr;
4013 if (nla[NFTA_RULE_USERDATA]) {
4014 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
4016 usize = sizeof(struct nft_userdata) + ulen;
4020 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
4022 goto err_release_expr;
4024 nft_activate_next(net, rule);
4026 rule->handle = handle;
4028 rule->udata = ulen ? 1 : 0;
4031 udata = nft_userdata(rule);
4032 udata->len = ulen - 1;
4033 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
4036 expr = nft_expr_first(rule);
4037 for (i = 0; i < n; i++) {
4038 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
4040 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
4041 goto err_release_rule;
4044 if (expr_info[i].ops->validate)
4045 nft_validate_state_update(table, NFT_VALIDATE_NEED);
4047 expr_info[i].ops = NULL;
4048 expr = nft_expr_next(expr);
4051 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
4052 flow = nft_flow_rule_create(net, rule);
4054 err = PTR_ERR(flow);
4055 goto err_release_rule;
4059 if (!nft_use_inc(&chain->use)) {
4061 goto err_release_rule;
4064 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
4065 if (nft_chain_binding(chain)) {
4067 goto err_destroy_flow_rule;
4070 err = nft_delrule(&ctx, old_rule);
4072 goto err_destroy_flow_rule;
4074 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4075 if (trans == NULL) {
4077 goto err_destroy_flow_rule;
4079 list_add_tail_rcu(&rule->list, &old_rule->list);
4081 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4084 goto err_destroy_flow_rule;
4087 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
4089 list_add_rcu(&rule->list, &old_rule->list);
4091 list_add_tail_rcu(&rule->list, &chain->rules);
4094 list_add_tail_rcu(&rule->list, &old_rule->list);
4096 list_add_rcu(&rule->list, &chain->rules);
4102 nft_trans_flow_rule(trans) = flow;
4104 if (table->validate_state == NFT_VALIDATE_DO)
4105 return nft_table_validate(net, table);
4109 err_destroy_flow_rule:
4110 nft_use_dec_restore(&chain->use);
4112 nft_flow_rule_destroy(flow);
4114 nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
4115 nf_tables_rule_destroy(&ctx, rule);
4117 for (i = 0; i < n; i++) {
4118 if (expr_info[i].ops) {
4119 module_put(expr_info[i].ops->type->owner);
4120 if (expr_info[i].ops->type->release_ops)
4121 expr_info[i].ops->type->release_ops(expr_info[i].ops);
4129 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4130 const struct nft_chain *chain,
4131 const struct nlattr *nla)
4133 struct nftables_pernet *nft_net = nft_pernet(net);
4134 u32 id = ntohl(nla_get_be32(nla));
4135 struct nft_trans *trans;
4137 list_for_each_entry(trans, &nft_net->commit_list, list) {
4138 if (trans->msg_type == NFT_MSG_NEWRULE &&
4139 trans->ctx.chain == chain &&
4140 id == nft_trans_rule_id(trans))
4141 return nft_trans_rule(trans);
4143 return ERR_PTR(-ENOENT);
4146 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4147 const struct nlattr * const nla[])
4149 struct netlink_ext_ack *extack = info->extack;
4150 u8 genmask = nft_genmask_next(info->net);
4151 u8 family = info->nfmsg->nfgen_family;
4152 struct nft_chain *chain = NULL;
4153 struct net *net = info->net;
4154 struct nft_table *table;
4155 struct nft_rule *rule;
4159 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4160 NETLINK_CB(skb).portid);
4161 if (IS_ERR(table)) {
4162 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4163 return PTR_ERR(table);
4166 if (nla[NFTA_RULE_CHAIN]) {
4167 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4169 if (IS_ERR(chain)) {
4170 if (PTR_ERR(chain) == -ENOENT &&
4171 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4174 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4175 return PTR_ERR(chain);
4177 if (nft_chain_binding(chain))
4181 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4184 if (nla[NFTA_RULE_HANDLE]) {
4185 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4187 if (PTR_ERR(rule) == -ENOENT &&
4188 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4191 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4192 return PTR_ERR(rule);
4195 err = nft_delrule(&ctx, rule);
4196 } else if (nla[NFTA_RULE_ID]) {
4197 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4199 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4200 return PTR_ERR(rule);
4203 err = nft_delrule(&ctx, rule);
4205 err = nft_delrule_by_chain(&ctx);
4208 list_for_each_entry(chain, &table->chains, list) {
4209 if (!nft_is_active_next(net, chain))
4211 if (nft_chain_binding(chain))
4215 err = nft_delrule_by_chain(&ctx);
4227 static const struct nft_set_type *nft_set_types[] = {
4228 &nft_set_hash_fast_type,
4230 &nft_set_rhash_type,
4231 &nft_set_bitmap_type,
4232 &nft_set_rbtree_type,
4233 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4234 &nft_set_pipapo_avx2_type,
4236 &nft_set_pipapo_type,
4239 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
4240 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4243 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4245 return (flags & type->features) == (flags & NFT_SET_FEATURES);
4249 * Select a set implementation based on the data characteristics and the
4250 * given policy. The total memory use might not be known if no size is
4251 * given, in that case the amount of memory per element is used.
4253 static const struct nft_set_ops *
4254 nft_select_set_ops(const struct nft_ctx *ctx, u32 flags,
4255 const struct nft_set_desc *desc)
4257 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4258 const struct nft_set_ops *ops, *bops;
4259 struct nft_set_estimate est, best;
4260 const struct nft_set_type *type;
4263 lockdep_assert_held(&nft_net->commit_mutex);
4264 lockdep_nfnl_nft_mutex_not_held();
4271 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4272 type = nft_set_types[i];
4275 if (!nft_set_ops_candidate(type, flags))
4277 if (!ops->estimate(desc, flags, &est))
4280 switch (desc->policy) {
4281 case NFT_SET_POL_PERFORMANCE:
4282 if (est.lookup < best.lookup)
4284 if (est.lookup == best.lookup &&
4285 est.space < best.space)
4288 case NFT_SET_POL_MEMORY:
4290 if (est.space < best.space)
4292 if (est.space == best.space &&
4293 est.lookup < best.lookup)
4295 } else if (est.size < best.size || !bops) {
4310 return ERR_PTR(-EOPNOTSUPP);
4313 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4314 [NFTA_SET_TABLE] = { .type = NLA_STRING,
4315 .len = NFT_TABLE_MAXNAMELEN - 1 },
4316 [NFTA_SET_NAME] = { .type = NLA_STRING,
4317 .len = NFT_SET_MAXNAMELEN - 1 },
4318 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
4319 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
4320 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
4321 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
4322 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
4323 [NFTA_SET_POLICY] = { .type = NLA_U32 },
4324 [NFTA_SET_DESC] = { .type = NLA_NESTED },
4325 [NFTA_SET_ID] = { .type = NLA_U32 },
4326 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
4327 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
4328 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
4329 .len = NFT_USERDATA_MAXLEN },
4330 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
4331 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
4332 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
4333 [NFTA_SET_EXPRESSIONS] = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
4336 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4337 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4340 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4341 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
4342 [NFTA_SET_DESC_CONCAT] = NLA_POLICY_NESTED_ARRAY(nft_concat_policy),
4345 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4346 const struct nlattr *nla, u8 genmask)
4348 struct nft_set *set;
4351 return ERR_PTR(-EINVAL);
4353 list_for_each_entry_rcu(set, &table->sets, list) {
4354 if (!nla_strcmp(nla, set->name) &&
4355 nft_active_genmask(set, genmask))
4358 return ERR_PTR(-ENOENT);
4361 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4362 const struct nlattr *nla,
4365 struct nft_set *set;
4367 list_for_each_entry(set, &table->sets, list) {
4368 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4369 nft_active_genmask(set, genmask))
4372 return ERR_PTR(-ENOENT);
4375 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4376 const struct nft_table *table,
4377 const struct nlattr *nla, u8 genmask)
4379 struct nftables_pernet *nft_net = nft_pernet(net);
4380 u32 id = ntohl(nla_get_be32(nla));
4381 struct nft_trans *trans;
4383 list_for_each_entry(trans, &nft_net->commit_list, list) {
4384 if (trans->msg_type == NFT_MSG_NEWSET) {
4385 struct nft_set *set = nft_trans_set(trans);
4387 if (id == nft_trans_set_id(trans) &&
4388 set->table == table &&
4389 nft_active_genmask(set, genmask))
4393 return ERR_PTR(-ENOENT);
4396 struct nft_set *nft_set_lookup_global(const struct net *net,
4397 const struct nft_table *table,
4398 const struct nlattr *nla_set_name,
4399 const struct nlattr *nla_set_id,
4402 struct nft_set *set;
4404 set = nft_set_lookup(table, nla_set_name, genmask);
4409 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4413 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4415 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4418 const struct nft_set *i;
4420 unsigned long *inuse;
4421 unsigned int n = 0, min = 0;
4423 p = strchr(name, '%');
4425 if (p[1] != 'd' || strchr(p + 2, '%'))
4428 if (strnlen(name, NFT_SET_MAX_ANONLEN) >= NFT_SET_MAX_ANONLEN)
4431 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4435 list_for_each_entry(i, &ctx->table->sets, list) {
4438 if (!nft_is_active_next(ctx->net, i))
4440 if (!sscanf(i->name, name, &tmp))
4442 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4445 set_bit(tmp - min, inuse);
4448 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4449 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4450 min += BITS_PER_BYTE * PAGE_SIZE;
4451 memset(inuse, 0, PAGE_SIZE);
4454 free_page((unsigned long)inuse);
4457 set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4461 list_for_each_entry(i, &ctx->table->sets, list) {
4462 if (!nft_is_active_next(ctx->net, i))
4464 if (!strcmp(set->name, i->name)) {
4473 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4475 u64 ms = be64_to_cpu(nla_get_be64(nla));
4476 u64 max = (u64)(~((u64)0));
4478 max = div_u64(max, NSEC_PER_MSEC);
4482 ms *= NSEC_PER_MSEC;
4483 *result = nsecs_to_jiffies64(ms);
4487 __be64 nf_jiffies64_to_msecs(u64 input)
4489 return cpu_to_be64(jiffies64_to_msecs(input));
4492 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4493 const struct nft_set *set)
4495 struct nlattr *concat, *field;
4498 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4502 for (i = 0; i < set->field_count; i++) {
4503 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4507 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4508 htonl(set->field_len[i])))
4511 nla_nest_end(skb, field);
4514 nla_nest_end(skb, concat);
4519 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4520 const struct nft_set *set, u16 event, u16 flags)
4522 u64 timeout = READ_ONCE(set->timeout);
4523 u32 gc_int = READ_ONCE(set->gc_int);
4524 u32 portid = ctx->portid;
4525 struct nlmsghdr *nlh;
4526 struct nlattr *nest;
4530 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4531 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4532 NFNETLINK_V0, nft_base_seq(ctx->net));
4534 goto nla_put_failure;
4536 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4537 goto nla_put_failure;
4538 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4539 goto nla_put_failure;
4540 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4542 goto nla_put_failure;
4544 if (event == NFT_MSG_DELSET) {
4545 nlmsg_end(skb, nlh);
4549 if (set->flags != 0)
4550 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4551 goto nla_put_failure;
4553 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4554 goto nla_put_failure;
4555 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4556 goto nla_put_failure;
4557 if (set->flags & NFT_SET_MAP) {
4558 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4559 goto nla_put_failure;
4560 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4561 goto nla_put_failure;
4563 if (set->flags & NFT_SET_OBJECT &&
4564 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4565 goto nla_put_failure;
4568 nla_put_be64(skb, NFTA_SET_TIMEOUT,
4569 nf_jiffies64_to_msecs(timeout),
4571 goto nla_put_failure;
4573 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4574 goto nla_put_failure;
4576 if (set->policy != NFT_SET_POL_PERFORMANCE) {
4577 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4578 goto nla_put_failure;
4582 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4583 goto nla_put_failure;
4585 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4587 goto nla_put_failure;
4589 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4590 goto nla_put_failure;
4592 if (set->field_count > 1 &&
4593 nf_tables_fill_set_concat(skb, set))
4594 goto nla_put_failure;
4596 nla_nest_end(skb, nest);
4598 if (set->num_exprs == 1) {
4599 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4600 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4601 goto nla_put_failure;
4603 nla_nest_end(skb, nest);
4604 } else if (set->num_exprs > 1) {
4605 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4607 goto nla_put_failure;
4609 for (i = 0; i < set->num_exprs; i++) {
4610 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4611 set->exprs[i], false) < 0)
4612 goto nla_put_failure;
4614 nla_nest_end(skb, nest);
4617 nlmsg_end(skb, nlh);
4621 nlmsg_trim(skb, nlh);
4625 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4626 const struct nft_set *set, int event,
4629 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4630 u32 portid = ctx->portid;
4631 struct sk_buff *skb;
4636 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4639 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4643 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4644 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4646 err = nf_tables_fill_set(skb, ctx, set, event, flags);
4652 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4655 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4658 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4660 const struct nft_set *set;
4661 unsigned int idx, s_idx = cb->args[0];
4662 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4663 struct net *net = sock_net(skb->sk);
4664 struct nft_ctx *ctx = cb->data, ctx_set;
4665 struct nftables_pernet *nft_net;
4671 nft_net = nft_pernet(net);
4672 cb->seq = READ_ONCE(nft_net->base_seq);
4674 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4675 if (ctx->family != NFPROTO_UNSPEC &&
4676 ctx->family != table->family)
4679 if (ctx->table && ctx->table != table)
4683 if (cur_table != table)
4689 list_for_each_entry_rcu(set, &table->sets, list) {
4692 if (!nft_is_active(net, set))
4696 ctx_set.table = table;
4697 ctx_set.family = table->family;
4699 if (nf_tables_fill_set(skb, &ctx_set, set,
4703 cb->args[2] = (unsigned long) table;
4706 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4719 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4721 struct nft_ctx *ctx_dump = NULL;
4723 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4724 if (ctx_dump == NULL)
4727 cb->data = ctx_dump;
4731 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4737 /* called with rcu_read_lock held */
4738 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4739 const struct nlattr * const nla[])
4741 struct netlink_ext_ack *extack = info->extack;
4742 u8 genmask = nft_genmask_cur(info->net);
4743 u8 family = info->nfmsg->nfgen_family;
4744 struct nft_table *table = NULL;
4745 struct net *net = info->net;
4746 const struct nft_set *set;
4747 struct sk_buff *skb2;
4751 if (nla[NFTA_SET_TABLE]) {
4752 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4754 if (IS_ERR(table)) {
4755 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4756 return PTR_ERR(table);
4760 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4762 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4763 struct netlink_dump_control c = {
4764 .start = nf_tables_dump_sets_start,
4765 .dump = nf_tables_dump_sets,
4766 .done = nf_tables_dump_sets_done,
4768 .module = THIS_MODULE,
4771 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4774 /* Only accept unspec with dump */
4775 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4776 return -EAFNOSUPPORT;
4777 if (!nla[NFTA_SET_TABLE])
4780 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4782 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4783 return PTR_ERR(set);
4786 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4790 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4792 goto err_fill_set_info;
4794 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4801 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4802 struct nft_set_desc *desc)
4804 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4808 if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4811 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4812 nft_concat_policy, NULL);
4816 if (!tb[NFTA_SET_FIELD_LEN])
4819 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4820 if (!len || len > U8_MAX)
4823 desc->field_len[desc->field_count++] = len;
4828 static int nft_set_desc_concat(struct nft_set_desc *desc,
4829 const struct nlattr *nla)
4831 u32 num_regs = 0, key_num_regs = 0;
4832 struct nlattr *attr;
4835 nla_for_each_nested(attr, nla, rem) {
4836 if (nla_type(attr) != NFTA_LIST_ELEM)
4839 err = nft_set_desc_concat_parse(attr, desc);
4844 for (i = 0; i < desc->field_count; i++)
4845 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4847 key_num_regs = DIV_ROUND_UP(desc->klen, sizeof(u32));
4848 if (key_num_regs != num_regs)
4851 if (num_regs > NFT_REG32_COUNT)
4857 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4858 const struct nlattr *nla)
4860 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4863 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4864 nft_set_desc_policy, NULL);
4868 if (da[NFTA_SET_DESC_SIZE] != NULL)
4869 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4870 if (da[NFTA_SET_DESC_CONCAT])
4871 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4876 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4877 const struct nlattr * const *nla,
4878 struct nft_expr **exprs, int *num_exprs,
4881 struct nft_expr *expr;
4884 if (nla[NFTA_SET_EXPR]) {
4885 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4887 err = PTR_ERR(expr);
4888 goto err_set_expr_alloc;
4892 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4896 if (!(flags & NFT_SET_EXPR)) {
4898 goto err_set_expr_alloc;
4901 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4902 if (i == NFT_SET_EXPR_MAX) {
4904 goto err_set_expr_alloc;
4906 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4908 goto err_set_expr_alloc;
4910 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4912 err = PTR_ERR(expr);
4913 goto err_set_expr_alloc;
4923 for (i = 0; i < *num_exprs; i++)
4924 nft_expr_destroy(ctx, exprs[i]);
4929 static bool nft_set_is_same(const struct nft_set *set,
4930 const struct nft_set_desc *desc,
4931 struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4935 if (set->ktype != desc->ktype ||
4936 set->dtype != desc->dtype ||
4937 set->flags != flags ||
4938 set->klen != desc->klen ||
4939 set->dlen != desc->dlen ||
4940 set->field_count != desc->field_count ||
4941 set->num_exprs != num_exprs)
4944 for (i = 0; i < desc->field_count; i++) {
4945 if (set->field_len[i] != desc->field_len[i])
4949 for (i = 0; i < num_exprs; i++) {
4950 if (set->exprs[i]->ops != exprs[i]->ops)
4957 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4958 const struct nlattr * const nla[])
4960 struct netlink_ext_ack *extack = info->extack;
4961 u8 genmask = nft_genmask_next(info->net);
4962 u8 family = info->nfmsg->nfgen_family;
4963 const struct nft_set_ops *ops;
4964 struct net *net = info->net;
4965 struct nft_set_desc desc;
4966 struct nft_table *table;
4967 unsigned char *udata;
4968 struct nft_set *set;
4978 if (nla[NFTA_SET_TABLE] == NULL ||
4979 nla[NFTA_SET_NAME] == NULL ||
4980 nla[NFTA_SET_KEY_LEN] == NULL ||
4981 nla[NFTA_SET_ID] == NULL)
4984 memset(&desc, 0, sizeof(desc));
4986 desc.ktype = NFT_DATA_VALUE;
4987 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4988 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4989 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4993 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4994 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4998 if (nla[NFTA_SET_FLAGS] != NULL) {
4999 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
5000 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
5001 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
5002 NFT_SET_MAP | NFT_SET_EVAL |
5003 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
5005 /* Only one of these operations is supported */
5006 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
5007 (NFT_SET_MAP | NFT_SET_OBJECT))
5009 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
5010 (NFT_SET_EVAL | NFT_SET_OBJECT))
5012 if ((flags & (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT | NFT_SET_EVAL)) ==
5013 (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT))
5015 if ((flags & (NFT_SET_CONSTANT | NFT_SET_TIMEOUT)) ==
5016 (NFT_SET_CONSTANT | NFT_SET_TIMEOUT))
5021 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
5022 if (!(flags & NFT_SET_MAP))
5025 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
5026 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
5027 desc.dtype != NFT_DATA_VERDICT)
5030 if (desc.dtype != NFT_DATA_VERDICT) {
5031 if (nla[NFTA_SET_DATA_LEN] == NULL)
5033 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
5034 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
5037 desc.dlen = sizeof(struct nft_verdict);
5038 } else if (flags & NFT_SET_MAP)
5041 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
5042 if (!(flags & NFT_SET_OBJECT))
5045 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
5046 if (desc.objtype == NFT_OBJECT_UNSPEC ||
5047 desc.objtype > NFT_OBJECT_MAX)
5049 } else if (flags & NFT_SET_OBJECT)
5052 desc.objtype = NFT_OBJECT_UNSPEC;
5055 if (nla[NFTA_SET_TIMEOUT] != NULL) {
5056 if (!(flags & NFT_SET_TIMEOUT))
5059 if (flags & NFT_SET_ANONYMOUS)
5062 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
5067 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
5068 if (!(flags & NFT_SET_TIMEOUT))
5071 if (flags & NFT_SET_ANONYMOUS)
5074 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
5077 desc.policy = NFT_SET_POL_PERFORMANCE;
5078 if (nla[NFTA_SET_POLICY] != NULL) {
5079 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
5080 switch (desc.policy) {
5081 case NFT_SET_POL_PERFORMANCE:
5082 case NFT_SET_POL_MEMORY:
5089 if (nla[NFTA_SET_DESC] != NULL) {
5090 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
5094 if (desc.field_count > 1) {
5095 if (!(flags & NFT_SET_CONCAT))
5097 } else if (flags & NFT_SET_CONCAT) {
5100 } else if (flags & NFT_SET_CONCAT) {
5104 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
5107 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
5108 NETLINK_CB(skb).portid);
5109 if (IS_ERR(table)) {
5110 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5111 return PTR_ERR(table);
5114 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5116 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
5118 if (PTR_ERR(set) != -ENOENT) {
5119 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5120 return PTR_ERR(set);
5123 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
5125 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
5126 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5129 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
5132 if (nft_set_is_anonymous(set))
5135 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
5140 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
5141 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5145 for (i = 0; i < num_exprs; i++)
5146 nft_expr_destroy(&ctx, exprs[i]);
5151 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5154 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5157 ops = nft_select_set_ops(&ctx, flags, &desc);
5159 return PTR_ERR(ops);
5162 if (nla[NFTA_SET_USERDATA])
5163 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5166 if (ops->privsize != NULL)
5167 size = ops->privsize(nla, &desc);
5168 alloc_size = sizeof(*set) + size + udlen;
5169 if (alloc_size < size || alloc_size > INT_MAX)
5172 if (!nft_use_inc(&table->use))
5175 set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5181 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5187 err = nf_tables_set_alloc_name(&ctx, set, name);
5194 udata = set->data + size;
5195 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5198 INIT_LIST_HEAD(&set->bindings);
5199 INIT_LIST_HEAD(&set->catchall_list);
5200 refcount_set(&set->refs, 1);
5202 write_pnet(&set->net, net);
5204 set->ktype = desc.ktype;
5205 set->klen = desc.klen;
5206 set->dtype = desc.dtype;
5207 set->objtype = desc.objtype;
5208 set->dlen = desc.dlen;
5210 set->size = desc.size;
5211 set->policy = desc.policy;
5214 set->timeout = desc.timeout;
5215 set->gc_int = desc.gc_int;
5217 set->field_count = desc.field_count;
5218 for (i = 0; i < desc.field_count; i++)
5219 set->field_len[i] = desc.field_len[i];
5221 err = ops->init(set, &desc, nla);
5225 err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5227 goto err_set_destroy;
5229 set->num_exprs = num_exprs;
5230 set->handle = nf_tables_alloc_handle(table);
5231 INIT_LIST_HEAD(&set->pending_update);
5233 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5235 goto err_set_expr_alloc;
5237 list_add_tail_rcu(&set->list, &table->sets);
5242 for (i = 0; i < set->num_exprs; i++)
5243 nft_expr_destroy(&ctx, set->exprs[i]);
5245 ops->destroy(&ctx, set);
5251 nft_use_dec_restore(&table->use);
5256 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5257 struct nft_set *set)
5259 struct nft_set_elem_catchall *next, *catchall;
5261 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5262 list_del_rcu(&catchall->list);
5263 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5264 kfree_rcu(catchall, rcu);
5268 static void nft_set_put(struct nft_set *set)
5270 if (refcount_dec_and_test(&set->refs)) {
5276 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5280 if (WARN_ON(set->use > 0))
5283 for (i = 0; i < set->num_exprs; i++)
5284 nft_expr_destroy(ctx, set->exprs[i]);
5286 set->ops->destroy(ctx, set);
5287 nft_set_catchall_destroy(ctx, set);
5291 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5292 const struct nlattr * const nla[])
5294 struct netlink_ext_ack *extack = info->extack;
5295 u8 genmask = nft_genmask_next(info->net);
5296 u8 family = info->nfmsg->nfgen_family;
5297 struct net *net = info->net;
5298 const struct nlattr *attr;
5299 struct nft_table *table;
5300 struct nft_set *set;
5303 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5304 return -EAFNOSUPPORT;
5306 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5307 genmask, NETLINK_CB(skb).portid);
5308 if (IS_ERR(table)) {
5309 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5310 return PTR_ERR(table);
5313 if (nla[NFTA_SET_HANDLE]) {
5314 attr = nla[NFTA_SET_HANDLE];
5315 set = nft_set_lookup_byhandle(table, attr, genmask);
5317 attr = nla[NFTA_SET_NAME];
5318 set = nft_set_lookup(table, attr, genmask);
5322 if (PTR_ERR(set) == -ENOENT &&
5323 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5326 NL_SET_BAD_ATTR(extack, attr);
5327 return PTR_ERR(set);
5330 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5331 atomic_read(&set->nelems) > 0)) {
5332 NL_SET_BAD_ATTR(extack, attr);
5336 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5338 return nft_delset(&ctx, set);
5341 static int nft_validate_register_store(const struct nft_ctx *ctx,
5342 enum nft_registers reg,
5343 const struct nft_data *data,
5344 enum nft_data_types type,
5347 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5348 struct nft_set *set,
5349 struct nft_elem_priv *elem_priv)
5351 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5352 enum nft_registers dreg;
5354 dreg = nft_type_to_reg(set->dtype);
5355 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5356 set->dtype == NFT_DATA_VERDICT ?
5357 NFT_DATA_VERDICT : NFT_DATA_VALUE,
5361 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5362 struct nft_set *set,
5363 const struct nft_set_iter *iter,
5364 struct nft_elem_priv *elem_priv)
5366 return nft_setelem_data_validate(ctx, set, elem_priv);
5369 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5370 struct nft_set *set)
5372 u8 genmask = nft_genmask_next(ctx->net);
5373 struct nft_set_elem_catchall *catchall;
5374 struct nft_set_ext *ext;
5377 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5378 ext = nft_set_elem_ext(set, catchall->elem);
5379 if (!nft_set_elem_active(ext, genmask))
5382 ret = nft_setelem_data_validate(ctx, set, catchall->elem);
5390 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5391 struct nft_set_binding *binding)
5393 struct nft_set_binding *i;
5394 struct nft_set_iter iter;
5396 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5399 if (binding->flags & NFT_SET_MAP) {
5400 /* If the set is already bound to the same chain all
5401 * jumps are already validated for that chain.
5403 list_for_each_entry(i, &set->bindings, list) {
5404 if (i->flags & NFT_SET_MAP &&
5405 i->chain == binding->chain)
5409 iter.genmask = nft_genmask_next(ctx->net);
5413 iter.fn = nf_tables_bind_check_setelem;
5415 set->ops->walk(ctx, set, &iter);
5417 iter.err = nft_set_catchall_bind_check(ctx, set);
5423 if (!nft_use_inc(&set->use))
5426 binding->chain = ctx->chain;
5427 list_add_tail_rcu(&binding->list, &set->bindings);
5428 nft_set_trans_bind(ctx, set);
5432 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5434 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5435 struct nft_set_binding *binding, bool event)
5437 list_del_rcu(&binding->list);
5439 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5440 list_del_rcu(&set->list);
5443 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5448 static void nft_setelem_data_activate(const struct net *net,
5449 const struct nft_set *set,
5450 struct nft_elem_priv *elem_priv);
5452 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5453 struct nft_set *set,
5454 const struct nft_set_iter *iter,
5455 struct nft_elem_priv *elem_priv)
5457 nft_setelem_data_activate(ctx->net, set, elem_priv);
5462 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5463 struct nft_set *set)
5465 u8 genmask = nft_genmask_next(ctx->net);
5466 struct nft_set_elem_catchall *catchall;
5467 struct nft_set_ext *ext;
5469 list_for_each_entry(catchall, &set->catchall_list, list) {
5470 ext = nft_set_elem_ext(set, catchall->elem);
5471 if (!nft_set_elem_active(ext, genmask))
5474 nft_setelem_data_activate(ctx->net, set, catchall->elem);
5479 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5481 struct nft_set_iter iter = {
5482 .genmask = nft_genmask_next(ctx->net),
5483 .fn = nft_mapelem_activate,
5486 set->ops->walk(ctx, set, &iter);
5487 WARN_ON_ONCE(iter.err);
5489 nft_map_catchall_activate(ctx, set);
5492 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5494 if (nft_set_is_anonymous(set)) {
5495 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5496 nft_map_activate(ctx, set);
5498 nft_clear(ctx->net, set);
5501 nft_use_inc_restore(&set->use);
5503 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5505 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5506 struct nft_set_binding *binding,
5507 enum nft_trans_phase phase)
5510 case NFT_TRANS_PREPARE_ERROR:
5511 nft_set_trans_unbind(ctx, set);
5512 if (nft_set_is_anonymous(set))
5513 nft_deactivate_next(ctx->net, set);
5515 list_del_rcu(&binding->list);
5517 nft_use_dec(&set->use);
5519 case NFT_TRANS_PREPARE:
5520 if (nft_set_is_anonymous(set)) {
5521 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5522 nft_map_deactivate(ctx, set);
5524 nft_deactivate_next(ctx->net, set);
5526 nft_use_dec(&set->use);
5528 case NFT_TRANS_ABORT:
5529 case NFT_TRANS_RELEASE:
5530 if (nft_set_is_anonymous(set) &&
5531 set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5532 nft_map_deactivate(ctx, set);
5534 nft_use_dec(&set->use);
5537 nf_tables_unbind_set(ctx, set, binding,
5538 phase == NFT_TRANS_COMMIT);
5541 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5543 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5545 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5546 nft_set_destroy(ctx, set);
5548 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5550 const struct nft_set_ext_type nft_set_ext_types[] = {
5551 [NFT_SET_EXT_KEY] = {
5552 .align = __alignof__(u32),
5554 [NFT_SET_EXT_DATA] = {
5555 .align = __alignof__(u32),
5557 [NFT_SET_EXT_EXPRESSIONS] = {
5558 .align = __alignof__(struct nft_set_elem_expr),
5560 [NFT_SET_EXT_OBJREF] = {
5561 .len = sizeof(struct nft_object *),
5562 .align = __alignof__(struct nft_object *),
5564 [NFT_SET_EXT_FLAGS] = {
5566 .align = __alignof__(u8),
5568 [NFT_SET_EXT_TIMEOUT] = {
5570 .align = __alignof__(u64),
5572 [NFT_SET_EXT_EXPIRATION] = {
5574 .align = __alignof__(u64),
5576 [NFT_SET_EXT_USERDATA] = {
5577 .len = sizeof(struct nft_userdata),
5578 .align = __alignof__(struct nft_userdata),
5580 [NFT_SET_EXT_KEY_END] = {
5581 .align = __alignof__(u32),
5589 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5590 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
5591 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
5592 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
5593 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
5594 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
5595 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
5596 .len = NFT_USERDATA_MAXLEN },
5597 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
5598 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
5599 .len = NFT_OBJ_MAXNAMELEN - 1 },
5600 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
5601 [NFTA_SET_ELEM_EXPRESSIONS] = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
5604 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5605 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
5606 .len = NFT_TABLE_MAXNAMELEN - 1 },
5607 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
5608 .len = NFT_SET_MAXNAMELEN - 1 },
5609 [NFTA_SET_ELEM_LIST_ELEMENTS] = NLA_POLICY_NESTED_ARRAY(nft_set_elem_policy),
5610 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
5613 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5614 const struct nft_set *set,
5615 const struct nft_set_ext *ext,
5618 struct nft_set_elem_expr *elem_expr;
5619 u32 size, num_exprs = 0;
5620 struct nft_expr *expr;
5621 struct nlattr *nest;
5623 elem_expr = nft_set_ext_expr(ext);
5624 nft_setelem_expr_foreach(expr, elem_expr, size)
5627 if (num_exprs == 1) {
5628 expr = nft_setelem_expr_at(elem_expr, 0);
5629 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5633 } else if (num_exprs > 1) {
5634 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5636 goto nla_put_failure;
5638 nft_setelem_expr_foreach(expr, elem_expr, size) {
5639 expr = nft_setelem_expr_at(elem_expr, size);
5640 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5641 goto nla_put_failure;
5643 nla_nest_end(skb, nest);
5651 static int nf_tables_fill_setelem(struct sk_buff *skb,
5652 const struct nft_set *set,
5653 const struct nft_elem_priv *elem_priv,
5656 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5657 unsigned char *b = skb_tail_pointer(skb);
5658 struct nlattr *nest;
5660 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5662 goto nla_put_failure;
5664 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5665 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5666 NFT_DATA_VALUE, set->klen) < 0)
5667 goto nla_put_failure;
5669 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5670 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5671 NFT_DATA_VALUE, set->klen) < 0)
5672 goto nla_put_failure;
5674 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5675 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5676 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5678 goto nla_put_failure;
5680 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5681 nft_set_elem_expr_dump(skb, set, ext, reset))
5682 goto nla_put_failure;
5684 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5685 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5686 (*nft_set_ext_obj(ext))->key.name) < 0)
5687 goto nla_put_failure;
5689 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5690 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5691 htonl(*nft_set_ext_flags(ext))))
5692 goto nla_put_failure;
5694 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5695 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5696 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5698 goto nla_put_failure;
5700 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5701 u64 expires, now = get_jiffies_64();
5703 expires = *nft_set_ext_expiration(ext);
5704 if (time_before64(now, expires))
5709 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5710 nf_jiffies64_to_msecs(expires),
5712 goto nla_put_failure;
5715 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5716 struct nft_userdata *udata;
5718 udata = nft_set_ext_userdata(ext);
5719 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5720 udata->len + 1, udata->data))
5721 goto nla_put_failure;
5724 nla_nest_end(skb, nest);
5732 struct nft_set_dump_args {
5733 const struct netlink_callback *cb;
5734 struct nft_set_iter iter;
5735 struct sk_buff *skb;
5739 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5740 struct nft_set *set,
5741 const struct nft_set_iter *iter,
5742 struct nft_elem_priv *elem_priv)
5744 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5745 struct nft_set_dump_args *args;
5747 if (nft_set_elem_expired(ext) || nft_set_elem_is_dead(ext))
5750 args = container_of(iter, struct nft_set_dump_args, iter);
5751 return nf_tables_fill_setelem(args->skb, set, elem_priv, args->reset);
5754 static void audit_log_nft_set_reset(const struct nft_table *table,
5755 unsigned int base_seq,
5756 unsigned int nentries)
5758 char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
5760 audit_log_nfcfg(buf, table->family, nentries,
5761 AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
5765 struct nft_set_dump_ctx {
5766 const struct nft_set *set;
5771 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5772 const struct nft_set *set, bool reset,
5773 unsigned int base_seq)
5775 struct nft_set_elem_catchall *catchall;
5776 u8 genmask = nft_genmask_cur(net);
5777 struct nft_set_ext *ext;
5780 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5781 ext = nft_set_elem_ext(set, catchall->elem);
5782 if (!nft_set_elem_active(ext, genmask) ||
5783 nft_set_elem_expired(ext))
5786 ret = nf_tables_fill_setelem(skb, set, catchall->elem, reset);
5788 audit_log_nft_set_reset(set->table, base_seq, 1);
5795 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5797 struct nft_set_dump_ctx *dump_ctx = cb->data;
5798 struct net *net = sock_net(skb->sk);
5799 struct nftables_pernet *nft_net;
5800 struct nft_table *table;
5801 struct nft_set *set;
5802 struct nft_set_dump_args args;
5803 bool set_found = false;
5804 struct nlmsghdr *nlh;
5805 struct nlattr *nest;
5810 nft_net = nft_pernet(net);
5811 cb->seq = READ_ONCE(nft_net->base_seq);
5813 list_for_each_entry_rcu(table, &nft_net->tables, list) {
5814 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5815 dump_ctx->ctx.family != table->family)
5818 if (table != dump_ctx->ctx.table)
5821 list_for_each_entry_rcu(set, &table->sets, list) {
5822 if (set == dump_ctx->set) {
5835 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5836 portid = NETLINK_CB(cb->skb).portid;
5837 seq = cb->nlh->nlmsg_seq;
5839 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5840 table->family, NFNETLINK_V0, nft_base_seq(net));
5842 goto nla_put_failure;
5844 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5845 goto nla_put_failure;
5846 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5847 goto nla_put_failure;
5849 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5851 goto nla_put_failure;
5855 args.reset = dump_ctx->reset;
5856 args.iter.genmask = nft_genmask_cur(net);
5857 args.iter.skip = cb->args[0];
5858 args.iter.count = 0;
5860 args.iter.fn = nf_tables_dump_setelem;
5861 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5863 if (!args.iter.err && args.iter.count == cb->args[0])
5864 args.iter.err = nft_set_catchall_dump(net, skb, set,
5865 dump_ctx->reset, cb->seq);
5866 nla_nest_end(skb, nest);
5867 nlmsg_end(skb, nlh);
5871 if (args.iter.err && args.iter.err != -EMSGSIZE)
5872 return args.iter.err;
5873 if (args.iter.count == cb->args[0])
5876 cb->args[0] = args.iter.count;
5884 static int nf_tables_dumpreset_set(struct sk_buff *skb,
5885 struct netlink_callback *cb)
5887 struct nftables_pernet *nft_net = nft_pernet(sock_net(skb->sk));
5888 struct nft_set_dump_ctx *dump_ctx = cb->data;
5889 int ret, skip = cb->args[0];
5891 mutex_lock(&nft_net->commit_mutex);
5893 ret = nf_tables_dump_set(skb, cb);
5895 if (cb->args[0] > skip)
5896 audit_log_nft_set_reset(dump_ctx->ctx.table, cb->seq,
5897 cb->args[0] - skip);
5899 mutex_unlock(&nft_net->commit_mutex);
5904 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5906 struct nft_set_dump_ctx *dump_ctx = cb->data;
5908 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5910 return cb->data ? 0 : -ENOMEM;
5913 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5919 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5920 const struct nft_ctx *ctx, u32 seq,
5921 u32 portid, int event, u16 flags,
5922 const struct nft_set *set,
5923 const struct nft_elem_priv *elem_priv,
5926 struct nlmsghdr *nlh;
5927 struct nlattr *nest;
5930 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5931 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5932 NFNETLINK_V0, nft_base_seq(ctx->net));
5934 goto nla_put_failure;
5936 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5937 goto nla_put_failure;
5938 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5939 goto nla_put_failure;
5941 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5943 goto nla_put_failure;
5945 err = nf_tables_fill_setelem(skb, set, elem_priv, reset);
5947 goto nla_put_failure;
5949 nla_nest_end(skb, nest);
5951 nlmsg_end(skb, nlh);
5955 nlmsg_trim(skb, nlh);
5959 static int nft_setelem_parse_flags(const struct nft_set *set,
5960 const struct nlattr *attr, u32 *flags)
5965 *flags = ntohl(nla_get_be32(attr));
5966 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5968 if (!(set->flags & NFT_SET_INTERVAL) &&
5969 *flags & NFT_SET_ELEM_INTERVAL_END)
5971 if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5972 (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5978 static int nft_setelem_parse_key(struct nft_ctx *ctx, const struct nft_set *set,
5979 struct nft_data *key, struct nlattr *attr)
5981 struct nft_data_desc desc = {
5982 .type = NFT_DATA_VALUE,
5983 .size = NFT_DATA_VALUE_MAXLEN,
5987 return nft_data_init(ctx, key, &desc, attr);
5990 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5991 struct nft_data_desc *desc,
5992 struct nft_data *data,
5993 struct nlattr *attr)
5997 if (set->dtype == NFT_DATA_VERDICT)
5998 dtype = NFT_DATA_VERDICT;
6000 dtype = NFT_DATA_VALUE;
6003 desc->size = NFT_DATA_VALUE_MAXLEN;
6004 desc->len = set->dlen;
6005 desc->flags = NFT_DATA_DESC_SETELEM;
6007 return nft_data_init(ctx, data, desc, attr);
6010 static void *nft_setelem_catchall_get(const struct net *net,
6011 const struct nft_set *set)
6013 struct nft_set_elem_catchall *catchall;
6014 u8 genmask = nft_genmask_cur(net);
6015 struct nft_set_ext *ext;
6018 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6019 ext = nft_set_elem_ext(set, catchall->elem);
6020 if (!nft_set_elem_active(ext, genmask) ||
6021 nft_set_elem_expired(ext))
6024 priv = catchall->elem;
6031 static int nft_setelem_get(struct nft_ctx *ctx, const struct nft_set *set,
6032 struct nft_set_elem *elem, u32 flags)
6036 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6037 priv = set->ops->get(ctx->net, set, elem, flags);
6039 return PTR_ERR(priv);
6041 priv = nft_setelem_catchall_get(ctx->net, set);
6050 static int nft_get_set_elem(struct nft_ctx *ctx, const struct nft_set *set,
6051 const struct nlattr *attr, bool reset)
6053 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6054 struct nft_set_elem elem;
6055 struct sk_buff *skb;
6059 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6060 nft_set_elem_policy, NULL);
6064 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6068 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6071 if (nla[NFTA_SET_ELEM_KEY]) {
6072 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6073 nla[NFTA_SET_ELEM_KEY]);
6078 if (nla[NFTA_SET_ELEM_KEY_END]) {
6079 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6080 nla[NFTA_SET_ELEM_KEY_END]);
6085 err = nft_setelem_get(ctx, set, &elem, flags);
6090 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
6094 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
6095 NFT_MSG_NEWSETELEM, 0, set, elem.priv,
6098 goto err_fill_setelem;
6100 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
6107 static int nft_set_dump_ctx_init(struct nft_set_dump_ctx *dump_ctx,
6108 const struct sk_buff *skb,
6109 const struct nfnl_info *info,
6110 const struct nlattr * const nla[],
6113 struct netlink_ext_ack *extack = info->extack;
6114 u8 genmask = nft_genmask_cur(info->net);
6115 u8 family = info->nfmsg->nfgen_family;
6116 struct net *net = info->net;
6117 struct nft_table *table;
6118 struct nft_set *set;
6120 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6122 if (IS_ERR(table)) {
6123 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6124 return PTR_ERR(table);
6127 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6129 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
6130 return PTR_ERR(set);
6133 nft_ctx_init(&dump_ctx->ctx, net, skb,
6134 info->nlh, family, table, NULL, nla);
6135 dump_ctx->set = set;
6136 dump_ctx->reset = reset;
6140 /* called with rcu_read_lock held */
6141 static int nf_tables_getsetelem(struct sk_buff *skb,
6142 const struct nfnl_info *info,
6143 const struct nlattr * const nla[])
6145 struct netlink_ext_ack *extack = info->extack;
6146 struct nft_set_dump_ctx dump_ctx;
6147 struct nlattr *attr;
6150 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6151 struct netlink_dump_control c = {
6152 .start = nf_tables_dump_set_start,
6153 .dump = nf_tables_dump_set,
6154 .done = nf_tables_dump_set_done,
6155 .module = THIS_MODULE,
6158 err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, false);
6163 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6166 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6169 err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, false);
6173 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6174 err = nft_get_set_elem(&dump_ctx.ctx, dump_ctx.set, attr, false);
6176 NL_SET_BAD_ATTR(extack, attr);
6184 static int nf_tables_getsetelem_reset(struct sk_buff *skb,
6185 const struct nfnl_info *info,
6186 const struct nlattr * const nla[])
6188 struct nftables_pernet *nft_net = nft_pernet(info->net);
6189 struct netlink_ext_ack *extack = info->extack;
6190 struct nft_set_dump_ctx dump_ctx;
6191 int rem, err = 0, nelems = 0;
6192 struct nlattr *attr;
6194 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6195 struct netlink_dump_control c = {
6196 .start = nf_tables_dump_set_start,
6197 .dump = nf_tables_dumpreset_set,
6198 .done = nf_tables_dump_set_done,
6199 .module = THIS_MODULE,
6202 err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, true);
6207 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6210 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6213 if (!try_module_get(THIS_MODULE))
6216 mutex_lock(&nft_net->commit_mutex);
6219 err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, true);
6223 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6224 err = nft_get_set_elem(&dump_ctx.ctx, dump_ctx.set, attr, true);
6226 NL_SET_BAD_ATTR(extack, attr);
6231 audit_log_nft_set_reset(dump_ctx.ctx.table, nft_net->base_seq, nelems);
6235 mutex_unlock(&nft_net->commit_mutex);
6237 module_put(THIS_MODULE);
6242 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
6243 const struct nft_set *set,
6244 const struct nft_elem_priv *elem_priv,
6247 struct nftables_pernet *nft_net;
6248 struct net *net = ctx->net;
6249 u32 portid = ctx->portid;
6250 struct sk_buff *skb;
6254 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6257 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6261 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6262 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6264 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6265 set, elem_priv, false);
6271 nft_net = nft_pernet(net);
6272 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6275 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6278 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6280 struct nft_set *set)
6282 struct nft_trans *trans;
6284 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6288 nft_trans_elem_set(trans) = set;
6292 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6293 const struct nft_set *set,
6294 const struct nlattr *attr)
6296 struct nft_expr *expr;
6299 expr = nft_expr_init(ctx, attr);
6304 if (expr->ops->type->flags & NFT_EXPR_GC) {
6305 if (set->flags & NFT_SET_TIMEOUT)
6306 goto err_set_elem_expr;
6307 if (!set->ops->gc_init)
6308 goto err_set_elem_expr;
6309 set->ops->gc_init(set);
6315 nft_expr_destroy(ctx, expr);
6316 return ERR_PTR(err);
6319 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6321 len += nft_set_ext_types[id].len;
6322 if (len > tmpl->ext_len[id] ||
6329 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6330 void *to, const void *from, u32 len)
6332 if (nft_set_ext_check(tmpl, id, len) < 0)
6335 memcpy(to, from, len);
6340 struct nft_elem_priv *nft_set_elem_init(const struct nft_set *set,
6341 const struct nft_set_ext_tmpl *tmpl,
6342 const u32 *key, const u32 *key_end,
6344 u64 timeout, u64 expiration, gfp_t gfp)
6346 struct nft_set_ext *ext;
6349 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6351 return ERR_PTR(-ENOMEM);
6353 ext = nft_set_elem_ext(set, elem);
6354 nft_set_ext_init(ext, tmpl);
6356 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6357 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6358 nft_set_ext_key(ext), key, set->klen) < 0)
6361 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6362 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6363 nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6366 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6367 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6368 nft_set_ext_data(ext), data, set->dlen) < 0)
6371 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6372 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6373 if (expiration == 0)
6374 *nft_set_ext_expiration(ext) += timeout;
6376 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6377 *nft_set_ext_timeout(ext) = timeout;
6384 return ERR_PTR(-EINVAL);
6387 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6388 struct nft_expr *expr)
6390 if (expr->ops->destroy_clone) {
6391 expr->ops->destroy_clone(ctx, expr);
6392 module_put(expr->ops->type->owner);
6394 nf_tables_expr_destroy(ctx, expr);
6398 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6399 struct nft_set_elem_expr *elem_expr)
6401 struct nft_expr *expr;
6404 nft_setelem_expr_foreach(expr, elem_expr, size)
6405 __nft_set_elem_expr_destroy(ctx, expr);
6408 /* Drop references and destroy. Called from gc, dynset and abort path. */
6409 void nft_set_elem_destroy(const struct nft_set *set,
6410 const struct nft_elem_priv *elem_priv,
6413 struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6414 struct nft_ctx ctx = {
6415 .net = read_pnet(&set->net),
6416 .family = set->table->family,
6419 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6420 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6421 nft_data_release(nft_set_ext_data(ext), set->dtype);
6422 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6423 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6424 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6425 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6429 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6431 /* Destroy element. References have been already dropped in the preparation
6432 * path via nft_setelem_data_deactivate().
6434 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6435 const struct nft_set *set,
6436 const struct nft_elem_priv *elem_priv)
6438 struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6440 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6441 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6446 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6447 struct nft_expr *expr_array[])
6449 struct nft_expr *expr;
6452 for (i = 0; i < set->num_exprs; i++) {
6453 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6457 err = nft_expr_clone(expr, set->exprs[i]);
6462 expr_array[i] = expr;
6468 for (k = i - 1; k >= 0; k--)
6469 nft_expr_destroy(ctx, expr_array[k]);
6474 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6475 const struct nft_set_ext_tmpl *tmpl,
6476 const struct nft_set_ext *ext,
6477 struct nft_expr *expr_array[],
6480 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6481 u32 len = sizeof(struct nft_set_elem_expr);
6482 struct nft_expr *expr;
6488 for (i = 0; i < num_exprs; i++)
6489 len += expr_array[i]->ops->size;
6491 if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6494 for (i = 0; i < num_exprs; i++) {
6495 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6496 err = nft_expr_clone(expr, expr_array[i]);
6498 goto err_elem_expr_setup;
6500 elem_expr->size += expr_array[i]->ops->size;
6501 nft_expr_destroy(ctx, expr_array[i]);
6502 expr_array[i] = NULL;
6507 err_elem_expr_setup:
6508 for (; i < num_exprs; i++) {
6509 nft_expr_destroy(ctx, expr_array[i]);
6510 expr_array[i] = NULL;
6516 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6517 const struct nft_set *set)
6519 struct nft_set_elem_catchall *catchall;
6520 u8 genmask = nft_genmask_cur(net);
6521 struct nft_set_ext *ext;
6523 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6524 ext = nft_set_elem_ext(set, catchall->elem);
6525 if (nft_set_elem_active(ext, genmask) &&
6526 !nft_set_elem_expired(ext) &&
6527 !nft_set_elem_is_dead(ext))
6533 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6535 static int nft_setelem_catchall_insert(const struct net *net,
6536 struct nft_set *set,
6537 const struct nft_set_elem *elem,
6538 struct nft_elem_priv **priv)
6540 struct nft_set_elem_catchall *catchall;
6541 u8 genmask = nft_genmask_next(net);
6542 struct nft_set_ext *ext;
6544 list_for_each_entry(catchall, &set->catchall_list, list) {
6545 ext = nft_set_elem_ext(set, catchall->elem);
6546 if (nft_set_elem_active(ext, genmask)) {
6547 *priv = catchall->elem;
6552 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6556 catchall->elem = elem->priv;
6557 list_add_tail_rcu(&catchall->list, &set->catchall_list);
6562 static int nft_setelem_insert(const struct net *net,
6563 struct nft_set *set,
6564 const struct nft_set_elem *elem,
6565 struct nft_elem_priv **elem_priv,
6570 if (flags & NFT_SET_ELEM_CATCHALL)
6571 ret = nft_setelem_catchall_insert(net, set, elem, elem_priv);
6573 ret = set->ops->insert(net, set, elem, elem_priv);
6578 static bool nft_setelem_is_catchall(const struct nft_set *set,
6579 const struct nft_elem_priv *elem_priv)
6581 struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6583 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6584 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6590 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6591 struct nft_elem_priv *elem_priv)
6593 struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6595 if (nft_setelem_is_catchall(set, elem_priv)) {
6596 nft_set_elem_change_active(net, set, ext);
6598 set->ops->activate(net, set, elem_priv);
6602 static int nft_setelem_catchall_deactivate(const struct net *net,
6603 struct nft_set *set,
6604 struct nft_set_elem *elem)
6606 struct nft_set_elem_catchall *catchall;
6607 struct nft_set_ext *ext;
6609 list_for_each_entry(catchall, &set->catchall_list, list) {
6610 ext = nft_set_elem_ext(set, catchall->elem);
6611 if (!nft_is_active_next(net, ext))
6615 elem->priv = catchall->elem;
6616 nft_set_elem_change_active(net, set, ext);
6623 static int __nft_setelem_deactivate(const struct net *net,
6624 struct nft_set *set,
6625 struct nft_set_elem *elem)
6629 priv = set->ops->deactivate(net, set, elem);
6640 static int nft_setelem_deactivate(const struct net *net,
6641 struct nft_set *set,
6642 struct nft_set_elem *elem, u32 flags)
6646 if (flags & NFT_SET_ELEM_CATCHALL)
6647 ret = nft_setelem_catchall_deactivate(net, set, elem);
6649 ret = __nft_setelem_deactivate(net, set, elem);
6654 static void nft_setelem_catchall_destroy(struct nft_set_elem_catchall *catchall)
6656 list_del_rcu(&catchall->list);
6657 kfree_rcu(catchall, rcu);
6660 static void nft_setelem_catchall_remove(const struct net *net,
6661 const struct nft_set *set,
6662 struct nft_elem_priv *elem_priv)
6664 struct nft_set_elem_catchall *catchall, *next;
6666 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6667 if (catchall->elem == elem_priv) {
6668 nft_setelem_catchall_destroy(catchall);
6674 static void nft_setelem_remove(const struct net *net,
6675 const struct nft_set *set,
6676 struct nft_elem_priv *elem_priv)
6678 if (nft_setelem_is_catchall(set, elem_priv))
6679 nft_setelem_catchall_remove(net, set, elem_priv);
6681 set->ops->remove(net, set, elem_priv);
6684 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6685 struct nlattr **nla, u32 flags)
6687 if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6688 (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6689 if (flags & NFT_SET_ELEM_INTERVAL_END)
6692 if (nla[NFTA_SET_ELEM_KEY_END] &&
6693 flags & NFT_SET_ELEM_CATCHALL)
6696 if (nla[NFTA_SET_ELEM_KEY_END])
6703 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6704 const struct nlattr *attr, u32 nlmsg_flags)
6706 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6707 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6708 u8 genmask = nft_genmask_next(ctx->net);
6709 u32 flags = 0, size = 0, num_exprs = 0;
6710 struct nft_set_ext_tmpl tmpl;
6711 struct nft_set_ext *ext, *ext2;
6712 struct nft_set_elem elem;
6713 struct nft_set_binding *binding;
6714 struct nft_elem_priv *elem_priv;
6715 struct nft_object *obj = NULL;
6716 struct nft_userdata *udata;
6717 struct nft_data_desc desc;
6718 enum nft_registers dreg;
6719 struct nft_trans *trans;
6725 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6726 nft_set_elem_policy, NULL);
6730 nft_set_ext_prepare(&tmpl);
6732 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6736 if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6737 (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6741 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6746 if (set->flags & NFT_SET_MAP) {
6747 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6748 !(flags & NFT_SET_ELEM_INTERVAL_END))
6751 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6755 if (set->flags & NFT_SET_OBJECT) {
6756 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6757 !(flags & NFT_SET_ELEM_INTERVAL_END))
6760 if (nla[NFTA_SET_ELEM_OBJREF])
6764 if (!nft_setelem_valid_key_end(set, nla, flags))
6767 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6768 (nla[NFTA_SET_ELEM_DATA] ||
6769 nla[NFTA_SET_ELEM_OBJREF] ||
6770 nla[NFTA_SET_ELEM_TIMEOUT] ||
6771 nla[NFTA_SET_ELEM_EXPIRATION] ||
6772 nla[NFTA_SET_ELEM_USERDATA] ||
6773 nla[NFTA_SET_ELEM_EXPR] ||
6774 nla[NFTA_SET_ELEM_KEY_END] ||
6775 nla[NFTA_SET_ELEM_EXPRESSIONS]))
6779 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6780 if (!(set->flags & NFT_SET_TIMEOUT))
6782 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6786 } else if (set->flags & NFT_SET_TIMEOUT &&
6787 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6788 timeout = READ_ONCE(set->timeout);
6792 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6793 if (!(set->flags & NFT_SET_TIMEOUT))
6795 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6801 if (nla[NFTA_SET_ELEM_EXPR]) {
6802 struct nft_expr *expr;
6804 if (set->num_exprs && set->num_exprs != 1)
6807 expr = nft_set_elem_expr_alloc(ctx, set,
6808 nla[NFTA_SET_ELEM_EXPR]);
6810 return PTR_ERR(expr);
6812 expr_array[0] = expr;
6815 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6817 goto err_set_elem_expr;
6819 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6820 struct nft_expr *expr;
6825 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6826 if (i == NFT_SET_EXPR_MAX ||
6827 (set->num_exprs && set->num_exprs == i)) {
6829 goto err_set_elem_expr;
6831 if (nla_type(tmp) != NFTA_LIST_ELEM) {
6833 goto err_set_elem_expr;
6835 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6837 err = PTR_ERR(expr);
6838 goto err_set_elem_expr;
6840 expr_array[i] = expr;
6843 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6845 goto err_set_elem_expr;
6849 if (set->num_exprs && set->num_exprs != i) {
6851 goto err_set_elem_expr;
6853 } else if (set->num_exprs > 0 &&
6854 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6855 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6857 goto err_set_elem_expr_clone;
6859 num_exprs = set->num_exprs;
6862 if (nla[NFTA_SET_ELEM_KEY]) {
6863 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6864 nla[NFTA_SET_ELEM_KEY]);
6866 goto err_set_elem_expr;
6868 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6873 if (nla[NFTA_SET_ELEM_KEY_END]) {
6874 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6875 nla[NFTA_SET_ELEM_KEY_END]);
6879 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6881 goto err_parse_key_end;
6885 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6887 goto err_parse_key_end;
6889 if (timeout != READ_ONCE(set->timeout)) {
6890 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6892 goto err_parse_key_end;
6897 for (i = 0; i < num_exprs; i++)
6898 size += expr_array[i]->ops->size;
6900 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6901 sizeof(struct nft_set_elem_expr) + size);
6903 goto err_parse_key_end;
6906 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6907 obj = nft_obj_lookup(ctx->net, ctx->table,
6908 nla[NFTA_SET_ELEM_OBJREF],
6909 set->objtype, genmask);
6913 goto err_parse_key_end;
6916 if (!nft_use_inc(&obj->use)) {
6919 goto err_parse_key_end;
6922 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6924 goto err_parse_key_end;
6927 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6928 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6929 nla[NFTA_SET_ELEM_DATA]);
6931 goto err_parse_key_end;
6933 dreg = nft_type_to_reg(set->dtype);
6934 list_for_each_entry(binding, &set->bindings, list) {
6935 struct nft_ctx bind_ctx = {
6937 .family = ctx->family,
6938 .table = ctx->table,
6939 .chain = (struct nft_chain *)binding->chain,
6942 if (!(binding->flags & NFT_SET_MAP))
6945 err = nft_validate_register_store(&bind_ctx, dreg,
6947 desc.type, desc.len);
6949 goto err_parse_data;
6951 if (desc.type == NFT_DATA_VERDICT &&
6952 (elem.data.val.verdict.code == NFT_GOTO ||
6953 elem.data.val.verdict.code == NFT_JUMP))
6954 nft_validate_state_update(ctx->table,
6958 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6960 goto err_parse_data;
6963 /* The full maximum length of userdata can exceed the maximum
6964 * offset value (U8_MAX) for following extensions, therefor it
6965 * must be the last extension added.
6968 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6969 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6971 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6974 goto err_parse_data;
6978 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6979 elem.key_end.val.data, elem.data.val.data,
6980 timeout, expiration, GFP_KERNEL_ACCOUNT);
6981 if (IS_ERR(elem.priv)) {
6982 err = PTR_ERR(elem.priv);
6983 goto err_parse_data;
6986 ext = nft_set_elem_ext(set, elem.priv);
6988 *nft_set_ext_flags(ext) = flags;
6991 *nft_set_ext_obj(ext) = obj;
6994 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6998 udata = nft_set_ext_userdata(ext);
6999 udata->len = ulen - 1;
7000 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
7002 err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
7006 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
7007 if (trans == NULL) {
7012 ext->genmask = nft_genmask_cur(ctx->net);
7014 err = nft_setelem_insert(ctx->net, set, &elem, &elem_priv, flags);
7016 if (err == -EEXIST) {
7017 ext2 = nft_set_elem_ext(set, elem_priv);
7018 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
7019 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
7020 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
7021 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
7022 goto err_element_clash;
7023 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
7024 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
7025 memcmp(nft_set_ext_data(ext),
7026 nft_set_ext_data(ext2), set->dlen) != 0) ||
7027 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
7028 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
7029 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
7030 goto err_element_clash;
7031 else if (!(nlmsg_flags & NLM_F_EXCL))
7033 } else if (err == -ENOTEMPTY) {
7034 /* ENOTEMPTY reports overlapping between this element
7035 * and an existing one.
7039 goto err_element_clash;
7042 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
7043 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
7045 if (!atomic_add_unless(&set->nelems, 1, max)) {
7051 nft_trans_elem_priv(trans) = elem.priv;
7052 nft_trans_commit_list_add_tail(ctx->net, trans);
7056 nft_setelem_remove(ctx->net, set, elem.priv);
7060 nf_tables_set_elem_destroy(ctx, set, elem.priv);
7062 if (nla[NFTA_SET_ELEM_DATA] != NULL)
7063 nft_data_release(&elem.data.val, desc.type);
7066 nft_use_dec_restore(&obj->use);
7068 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7070 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7072 for (i = 0; i < num_exprs && expr_array[i]; i++)
7073 nft_expr_destroy(ctx, expr_array[i]);
7074 err_set_elem_expr_clone:
7078 static int nf_tables_newsetelem(struct sk_buff *skb,
7079 const struct nfnl_info *info,
7080 const struct nlattr * const nla[])
7082 struct netlink_ext_ack *extack = info->extack;
7083 u8 genmask = nft_genmask_next(info->net);
7084 u8 family = info->nfmsg->nfgen_family;
7085 struct net *net = info->net;
7086 const struct nlattr *attr;
7087 struct nft_table *table;
7088 struct nft_set *set;
7092 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
7095 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7096 genmask, NETLINK_CB(skb).portid);
7097 if (IS_ERR(table)) {
7098 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7099 return PTR_ERR(table);
7102 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
7103 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
7105 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
7106 return PTR_ERR(set);
7109 if (!list_empty(&set->bindings) &&
7110 (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
7113 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7115 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7116 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
7118 NL_SET_BAD_ATTR(extack, attr);
7123 if (table->validate_state == NFT_VALIDATE_DO)
7124 return nft_table_validate(net, table);
7130 * nft_data_hold - hold a nft_data item
7132 * @data: struct nft_data to release
7133 * @type: type of data
7135 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7136 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
7137 * NFT_GOTO verdicts. This function must be called on active data objects
7138 * from the second phase of the commit protocol.
7140 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
7142 struct nft_chain *chain;
7144 if (type == NFT_DATA_VERDICT) {
7145 switch (data->verdict.code) {
7148 chain = data->verdict.chain;
7149 nft_use_inc_restore(&chain->use);
7155 static void nft_setelem_data_activate(const struct net *net,
7156 const struct nft_set *set,
7157 struct nft_elem_priv *elem_priv)
7159 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
7161 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7162 nft_data_hold(nft_set_ext_data(ext), set->dtype);
7163 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7164 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
7167 void nft_setelem_data_deactivate(const struct net *net,
7168 const struct nft_set *set,
7169 struct nft_elem_priv *elem_priv)
7171 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
7173 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7174 nft_data_release(nft_set_ext_data(ext), set->dtype);
7175 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7176 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
7179 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
7180 const struct nlattr *attr)
7182 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
7183 struct nft_set_ext_tmpl tmpl;
7184 struct nft_set_elem elem;
7185 struct nft_set_ext *ext;
7186 struct nft_trans *trans;
7190 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
7191 nft_set_elem_policy, NULL);
7195 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
7199 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
7202 if (!nft_setelem_valid_key_end(set, nla, flags))
7205 nft_set_ext_prepare(&tmpl);
7208 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
7213 if (nla[NFTA_SET_ELEM_KEY]) {
7214 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
7215 nla[NFTA_SET_ELEM_KEY]);
7219 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7224 if (nla[NFTA_SET_ELEM_KEY_END]) {
7225 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
7226 nla[NFTA_SET_ELEM_KEY_END]);
7230 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
7232 goto fail_elem_key_end;
7236 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7237 elem.key_end.val.data, NULL, 0, 0,
7238 GFP_KERNEL_ACCOUNT);
7239 if (IS_ERR(elem.priv)) {
7240 err = PTR_ERR(elem.priv);
7241 goto fail_elem_key_end;
7244 ext = nft_set_elem_ext(set, elem.priv);
7246 *nft_set_ext_flags(ext) = flags;
7248 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7252 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7256 nft_setelem_data_deactivate(ctx->net, set, elem.priv);
7258 nft_trans_elem_priv(trans) = elem.priv;
7259 nft_trans_commit_list_add_tail(ctx->net, trans);
7267 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7269 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7273 static int nft_setelem_flush(const struct nft_ctx *ctx,
7274 struct nft_set *set,
7275 const struct nft_set_iter *iter,
7276 struct nft_elem_priv *elem_priv)
7278 struct nft_trans *trans;
7280 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7281 sizeof(struct nft_trans_elem), GFP_ATOMIC);
7285 set->ops->flush(ctx->net, set, elem_priv);
7288 nft_setelem_data_deactivate(ctx->net, set, elem_priv);
7289 nft_trans_elem_set(trans) = set;
7290 nft_trans_elem_priv(trans) = elem_priv;
7291 nft_trans_commit_list_add_tail(ctx->net, trans);
7296 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7297 struct nft_set *set,
7298 struct nft_elem_priv *elem_priv)
7300 struct nft_trans *trans;
7302 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7303 sizeof(struct nft_trans_elem), GFP_KERNEL);
7307 nft_setelem_data_deactivate(ctx->net, set, elem_priv);
7308 nft_trans_elem_set(trans) = set;
7309 nft_trans_elem_priv(trans) = elem_priv;
7310 nft_trans_commit_list_add_tail(ctx->net, trans);
7315 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7316 struct nft_set *set)
7318 u8 genmask = nft_genmask_next(ctx->net);
7319 struct nft_set_elem_catchall *catchall;
7320 struct nft_set_ext *ext;
7323 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7324 ext = nft_set_elem_ext(set, catchall->elem);
7325 if (!nft_set_elem_active(ext, genmask))
7328 ret = __nft_set_catchall_flush(ctx, set, catchall->elem);
7331 nft_set_elem_change_active(ctx->net, set, ext);
7337 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7339 struct nft_set_iter iter = {
7341 .fn = nft_setelem_flush,
7344 set->ops->walk(ctx, set, &iter);
7346 iter.err = nft_set_catchall_flush(ctx, set);
7351 static int nf_tables_delsetelem(struct sk_buff *skb,
7352 const struct nfnl_info *info,
7353 const struct nlattr * const nla[])
7355 struct netlink_ext_ack *extack = info->extack;
7356 u8 genmask = nft_genmask_next(info->net);
7357 u8 family = info->nfmsg->nfgen_family;
7358 struct net *net = info->net;
7359 const struct nlattr *attr;
7360 struct nft_table *table;
7361 struct nft_set *set;
7365 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7366 genmask, NETLINK_CB(skb).portid);
7367 if (IS_ERR(table)) {
7368 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7369 return PTR_ERR(table);
7372 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7374 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
7375 return PTR_ERR(set);
7378 if (nft_set_is_anonymous(set))
7381 if (!list_empty(&set->bindings) && (set->flags & NFT_SET_CONSTANT))
7384 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7386 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7387 return nft_set_flush(&ctx, set, genmask);
7389 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7390 err = nft_del_setelem(&ctx, set, attr);
7391 if (err == -ENOENT &&
7392 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7396 NL_SET_BAD_ATTR(extack, attr);
7409 * nft_register_obj- register nf_tables stateful object type
7410 * @obj_type: object type
7412 * Registers the object type for use with nf_tables. Returns zero on
7413 * success or a negative errno code otherwise.
7415 int nft_register_obj(struct nft_object_type *obj_type)
7417 if (obj_type->type == NFT_OBJECT_UNSPEC)
7420 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7421 list_add_rcu(&obj_type->list, &nf_tables_objects);
7422 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7425 EXPORT_SYMBOL_GPL(nft_register_obj);
7428 * nft_unregister_obj - unregister nf_tables object type
7429 * @obj_type: object type
7431 * Unregisters the object type for use with nf_tables.
7433 void nft_unregister_obj(struct nft_object_type *obj_type)
7435 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7436 list_del_rcu(&obj_type->list);
7437 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7439 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7441 struct nft_object *nft_obj_lookup(const struct net *net,
7442 const struct nft_table *table,
7443 const struct nlattr *nla, u32 objtype,
7446 struct nft_object_hash_key k = { .table = table };
7447 char search[NFT_OBJ_MAXNAMELEN];
7448 struct rhlist_head *tmp, *list;
7449 struct nft_object *obj;
7451 nla_strscpy(search, nla, sizeof(search));
7454 WARN_ON_ONCE(!rcu_read_lock_held() &&
7455 !lockdep_commit_lock_is_held(net));
7458 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7462 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7463 if (objtype == obj->ops->type->type &&
7464 nft_active_genmask(obj, genmask)) {
7471 return ERR_PTR(-ENOENT);
7473 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7475 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7476 const struct nlattr *nla,
7477 u32 objtype, u8 genmask)
7479 struct nft_object *obj;
7481 list_for_each_entry(obj, &table->objects, list) {
7482 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7483 objtype == obj->ops->type->type &&
7484 nft_active_genmask(obj, genmask))
7487 return ERR_PTR(-ENOENT);
7490 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7491 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
7492 .len = NFT_TABLE_MAXNAMELEN - 1 },
7493 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
7494 .len = NFT_OBJ_MAXNAMELEN - 1 },
7495 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
7496 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
7497 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
7498 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
7499 .len = NFT_USERDATA_MAXLEN },
7502 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7503 const struct nft_object_type *type,
7504 const struct nlattr *attr)
7507 const struct nft_object_ops *ops;
7508 struct nft_object *obj;
7511 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7516 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7517 type->policy, NULL);
7521 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7524 if (type->select_ops) {
7525 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7535 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7539 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7552 return ERR_PTR(err);
7555 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7556 struct nft_object *obj, bool reset)
7558 struct nlattr *nest;
7560 nest = nla_nest_start_noflag(skb, attr);
7562 goto nla_put_failure;
7563 if (obj->ops->dump(skb, obj, reset) < 0)
7564 goto nla_put_failure;
7565 nla_nest_end(skb, nest);
7572 static const struct nft_object_type *__nft_obj_type_get(u32 objtype, u8 family)
7574 const struct nft_object_type *type;
7576 list_for_each_entry(type, &nf_tables_objects, list) {
7577 if (type->family != NFPROTO_UNSPEC &&
7578 type->family != family)
7581 if (objtype == type->type)
7587 static const struct nft_object_type *
7588 nft_obj_type_get(struct net *net, u32 objtype, u8 family)
7590 const struct nft_object_type *type;
7592 type = __nft_obj_type_get(objtype, family);
7593 if (type != NULL && try_module_get(type->owner))
7596 lockdep_nfnl_nft_mutex_not_held();
7597 #ifdef CONFIG_MODULES
7599 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7600 return ERR_PTR(-EAGAIN);
7603 return ERR_PTR(-ENOENT);
7606 static int nf_tables_updobj(const struct nft_ctx *ctx,
7607 const struct nft_object_type *type,
7608 const struct nlattr *attr,
7609 struct nft_object *obj)
7611 struct nft_object *newobj;
7612 struct nft_trans *trans;
7615 if (!try_module_get(type->owner))
7618 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7619 sizeof(struct nft_trans_obj));
7623 newobj = nft_obj_init(ctx, type, attr);
7624 if (IS_ERR(newobj)) {
7625 err = PTR_ERR(newobj);
7626 goto err_free_trans;
7629 nft_trans_obj(trans) = obj;
7630 nft_trans_obj_update(trans) = true;
7631 nft_trans_obj_newobj(trans) = newobj;
7632 nft_trans_commit_list_add_tail(ctx->net, trans);
7639 module_put(type->owner);
7643 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7644 const struct nlattr * const nla[])
7646 struct netlink_ext_ack *extack = info->extack;
7647 u8 genmask = nft_genmask_next(info->net);
7648 u8 family = info->nfmsg->nfgen_family;
7649 const struct nft_object_type *type;
7650 struct net *net = info->net;
7651 struct nft_table *table;
7652 struct nft_object *obj;
7657 if (!nla[NFTA_OBJ_TYPE] ||
7658 !nla[NFTA_OBJ_NAME] ||
7659 !nla[NFTA_OBJ_DATA])
7662 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7663 NETLINK_CB(skb).portid);
7664 if (IS_ERR(table)) {
7665 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7666 return PTR_ERR(table);
7669 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7670 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7673 if (err != -ENOENT) {
7674 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7678 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7679 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7682 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7685 type = __nft_obj_type_get(objtype, family);
7686 if (WARN_ON_ONCE(!type))
7689 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7691 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7694 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7696 if (!nft_use_inc(&table->use))
7699 type = nft_obj_type_get(net, objtype, family);
7701 err = PTR_ERR(type);
7705 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7710 obj->key.table = table;
7711 obj->handle = nf_tables_alloc_handle(table);
7713 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7714 if (!obj->key.name) {
7719 if (nla[NFTA_OBJ_USERDATA]) {
7720 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7721 if (obj->udata == NULL)
7724 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7727 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7731 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7732 nft_objname_ht_params);
7736 list_add_tail_rcu(&obj->list, &table->objects);
7740 /* queued in transaction log */
7741 INIT_LIST_HEAD(&obj->list);
7746 kfree(obj->key.name);
7748 if (obj->ops->destroy)
7749 obj->ops->destroy(&ctx, obj);
7752 module_put(type->owner);
7754 nft_use_dec_restore(&table->use);
7759 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7760 u32 portid, u32 seq, int event, u32 flags,
7761 int family, const struct nft_table *table,
7762 struct nft_object *obj, bool reset)
7764 struct nlmsghdr *nlh;
7766 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7767 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7768 NFNETLINK_V0, nft_base_seq(net));
7770 goto nla_put_failure;
7772 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7773 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7774 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7776 goto nla_put_failure;
7778 if (event == NFT_MSG_DELOBJ) {
7779 nlmsg_end(skb, nlh);
7783 if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7784 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7785 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7786 goto nla_put_failure;
7789 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7790 goto nla_put_failure;
7792 nlmsg_end(skb, nlh);
7796 nlmsg_trim(skb, nlh);
7800 static void audit_log_obj_reset(const struct nft_table *table,
7801 unsigned int base_seq, unsigned int nentries)
7803 char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
7805 audit_log_nfcfg(buf, table->family, nentries,
7806 AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
7810 struct nft_obj_dump_ctx {
7817 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7819 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7820 struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7821 struct net *net = sock_net(skb->sk);
7822 int family = nfmsg->nfgen_family;
7823 struct nftables_pernet *nft_net;
7824 const struct nft_table *table;
7825 unsigned int entries = 0;
7826 struct nft_object *obj;
7827 unsigned int idx = 0;
7831 nft_net = nft_pernet(net);
7832 cb->seq = READ_ONCE(nft_net->base_seq);
7834 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7835 if (family != NFPROTO_UNSPEC && family != table->family)
7839 list_for_each_entry_rcu(obj, &table->objects, list) {
7840 if (!nft_is_active(net, obj))
7842 if (idx < ctx->s_idx)
7844 if (ctx->table && strcmp(ctx->table, table->name))
7846 if (ctx->type != NFT_OBJECT_UNSPEC &&
7847 obj->ops->type->type != ctx->type)
7850 rc = nf_tables_fill_obj_info(skb, net,
7851 NETLINK_CB(cb->skb).portid,
7854 NLM_F_MULTI | NLM_F_APPEND,
7855 table->family, table,
7861 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7865 if (ctx->reset && entries)
7866 audit_log_obj_reset(table, nft_net->base_seq, entries);
7876 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7878 struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7879 const struct nlattr * const *nla = cb->data;
7881 BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
7883 if (nla[NFTA_OBJ_TABLE]) {
7884 ctx->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7889 if (nla[NFTA_OBJ_TYPE])
7890 ctx->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7892 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7898 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7900 struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7907 /* called with rcu_read_lock held */
7908 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7909 const struct nlattr * const nla[])
7911 struct netlink_ext_ack *extack = info->extack;
7912 u8 genmask = nft_genmask_cur(info->net);
7913 u8 family = info->nfmsg->nfgen_family;
7914 const struct nft_table *table;
7915 struct net *net = info->net;
7916 struct nft_object *obj;
7917 struct sk_buff *skb2;
7922 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7923 struct netlink_dump_control c = {
7924 .start = nf_tables_dump_obj_start,
7925 .dump = nf_tables_dump_obj,
7926 .done = nf_tables_dump_obj_done,
7927 .module = THIS_MODULE,
7928 .data = (void *)nla,
7931 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7934 if (!nla[NFTA_OBJ_NAME] ||
7935 !nla[NFTA_OBJ_TYPE])
7938 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7939 if (IS_ERR(table)) {
7940 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7941 return PTR_ERR(table);
7944 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7945 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7947 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7948 return PTR_ERR(obj);
7951 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7955 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7959 const struct nftables_pernet *nft_net;
7962 nft_net = nft_pernet(net);
7963 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7965 audit_log_nfcfg(buf,
7968 AUDIT_NFT_OP_OBJ_RESET,
7973 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7974 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7975 family, table, obj, reset);
7977 goto err_fill_obj_info;
7979 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7986 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7988 if (obj->ops->destroy)
7989 obj->ops->destroy(ctx, obj);
7991 module_put(obj->ops->type->owner);
7992 kfree(obj->key.name);
7997 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7998 const struct nlattr * const nla[])
8000 struct netlink_ext_ack *extack = info->extack;
8001 u8 genmask = nft_genmask_next(info->net);
8002 u8 family = info->nfmsg->nfgen_family;
8003 struct net *net = info->net;
8004 const struct nlattr *attr;
8005 struct nft_table *table;
8006 struct nft_object *obj;
8010 if (!nla[NFTA_OBJ_TYPE] ||
8011 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
8014 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
8015 NETLINK_CB(skb).portid);
8016 if (IS_ERR(table)) {
8017 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
8018 return PTR_ERR(table);
8021 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
8022 if (nla[NFTA_OBJ_HANDLE]) {
8023 attr = nla[NFTA_OBJ_HANDLE];
8024 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
8026 attr = nla[NFTA_OBJ_NAME];
8027 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
8031 if (PTR_ERR(obj) == -ENOENT &&
8032 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
8035 NL_SET_BAD_ATTR(extack, attr);
8036 return PTR_ERR(obj);
8039 NL_SET_BAD_ATTR(extack, attr);
8043 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8045 return nft_delobj(&ctx, obj);
8049 __nft_obj_notify(struct net *net, const struct nft_table *table,
8050 struct nft_object *obj, u32 portid, u32 seq, int event,
8051 u16 flags, int family, int report, gfp_t gfp)
8053 struct nftables_pernet *nft_net = nft_pernet(net);
8054 struct sk_buff *skb;
8058 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8061 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
8065 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
8066 flags & (NLM_F_CREATE | NLM_F_EXCL),
8067 family, table, obj, false);
8073 nft_notify_enqueue(skb, report, &nft_net->notify_list);
8076 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
8079 void nft_obj_notify(struct net *net, const struct nft_table *table,
8080 struct nft_object *obj, u32 portid, u32 seq, int event,
8081 u16 flags, int family, int report, gfp_t gfp)
8083 struct nftables_pernet *nft_net = nft_pernet(net);
8084 char *buf = kasprintf(gfp, "%s:%u",
8085 table->name, nft_net->base_seq);
8087 audit_log_nfcfg(buf,
8090 event == NFT_MSG_NEWOBJ ?
8091 AUDIT_NFT_OP_OBJ_REGISTER :
8092 AUDIT_NFT_OP_OBJ_UNREGISTER,
8096 __nft_obj_notify(net, table, obj, portid, seq, event,
8097 flags, family, report, gfp);
8099 EXPORT_SYMBOL_GPL(nft_obj_notify);
8101 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
8102 struct nft_object *obj, int event)
8104 __nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
8105 ctx->seq, event, ctx->flags, ctx->family,
8106 ctx->report, GFP_KERNEL);
8112 void nft_register_flowtable_type(struct nf_flowtable_type *type)
8114 nfnl_lock(NFNL_SUBSYS_NFTABLES);
8115 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
8116 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8118 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
8120 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
8122 nfnl_lock(NFNL_SUBSYS_NFTABLES);
8123 list_del_rcu(&type->list);
8124 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8126 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
8128 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
8129 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
8130 .len = NFT_NAME_MAXLEN - 1 },
8131 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
8132 .len = NFT_NAME_MAXLEN - 1 },
8133 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
8134 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
8135 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
8138 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
8139 const struct nlattr *nla, u8 genmask)
8141 struct nft_flowtable *flowtable;
8143 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8144 if (!nla_strcmp(nla, flowtable->name) &&
8145 nft_active_genmask(flowtable, genmask))
8148 return ERR_PTR(-ENOENT);
8150 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
8152 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
8153 struct nft_flowtable *flowtable,
8154 enum nft_trans_phase phase)
8157 case NFT_TRANS_PREPARE_ERROR:
8158 case NFT_TRANS_PREPARE:
8159 case NFT_TRANS_ABORT:
8160 case NFT_TRANS_RELEASE:
8161 nft_use_dec(&flowtable->use);
8167 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
8169 static struct nft_flowtable *
8170 nft_flowtable_lookup_byhandle(const struct nft_table *table,
8171 const struct nlattr *nla, u8 genmask)
8173 struct nft_flowtable *flowtable;
8175 list_for_each_entry(flowtable, &table->flowtables, list) {
8176 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
8177 nft_active_genmask(flowtable, genmask))
8180 return ERR_PTR(-ENOENT);
8183 struct nft_flowtable_hook {
8186 struct list_head list;
8189 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
8190 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
8191 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
8192 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
8195 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
8196 const struct nlattr * const nla[],
8197 struct nft_flowtable_hook *flowtable_hook,
8198 struct nft_flowtable *flowtable,
8199 struct netlink_ext_ack *extack, bool add)
8201 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
8202 struct nft_hook *hook;
8203 int hooknum, priority;
8206 INIT_LIST_HEAD(&flowtable_hook->list);
8208 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
8209 nla[NFTA_FLOWTABLE_HOOK],
8210 nft_flowtable_hook_policy, NULL);
8215 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
8216 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8217 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8221 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8222 if (hooknum != NF_NETDEV_INGRESS)
8225 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8227 flowtable_hook->priority = priority;
8228 flowtable_hook->num = hooknum;
8230 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8231 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8232 if (hooknum != flowtable->hooknum)
8236 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8237 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8238 if (priority != flowtable->data.priority)
8242 flowtable_hook->priority = flowtable->data.priority;
8243 flowtable_hook->num = flowtable->hooknum;
8246 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8247 err = nf_tables_parse_netdev_hooks(ctx->net,
8248 tb[NFTA_FLOWTABLE_HOOK_DEVS],
8249 &flowtable_hook->list,
8255 list_for_each_entry(hook, &flowtable_hook->list, list) {
8256 hook->ops.pf = NFPROTO_NETDEV;
8257 hook->ops.hooknum = flowtable_hook->num;
8258 hook->ops.priority = flowtable_hook->priority;
8259 hook->ops.priv = &flowtable->data;
8260 hook->ops.hook = flowtable->data.type->hook;
8266 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8268 const struct nf_flowtable_type *type;
8270 list_for_each_entry(type, &nf_tables_flowtables, list) {
8271 if (family == type->family)
8277 static const struct nf_flowtable_type *
8278 nft_flowtable_type_get(struct net *net, u8 family)
8280 const struct nf_flowtable_type *type;
8282 type = __nft_flowtable_type_get(family);
8283 if (type != NULL && try_module_get(type->owner))
8286 lockdep_nfnl_nft_mutex_not_held();
8287 #ifdef CONFIG_MODULES
8289 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8290 return ERR_PTR(-EAGAIN);
8293 return ERR_PTR(-ENOENT);
8296 /* Only called from error and netdev event paths. */
8297 static void nft_unregister_flowtable_hook(struct net *net,
8298 struct nft_flowtable *flowtable,
8299 struct nft_hook *hook)
8301 nf_unregister_net_hook(net, &hook->ops);
8302 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8306 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8307 struct list_head *hook_list,
8308 bool release_netdev)
8310 struct nft_hook *hook, *next;
8312 list_for_each_entry_safe(hook, next, hook_list, list) {
8313 nf_unregister_net_hook(net, &hook->ops);
8314 if (release_netdev) {
8315 list_del(&hook->list);
8316 kfree_rcu(hook, rcu);
8321 static void nft_unregister_flowtable_net_hooks(struct net *net,
8322 struct list_head *hook_list)
8324 __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8327 static int nft_register_flowtable_net_hooks(struct net *net,
8328 struct nft_table *table,
8329 struct list_head *hook_list,
8330 struct nft_flowtable *flowtable)
8332 struct nft_hook *hook, *hook2, *next;
8333 struct nft_flowtable *ft;
8336 list_for_each_entry(hook, hook_list, list) {
8337 list_for_each_entry(ft, &table->flowtables, list) {
8338 if (!nft_is_active_next(net, ft))
8341 list_for_each_entry(hook2, &ft->hook_list, list) {
8342 if (hook->ops.dev == hook2->ops.dev &&
8343 hook->ops.pf == hook2->ops.pf) {
8345 goto err_unregister_net_hooks;
8350 err = flowtable->data.type->setup(&flowtable->data,
8354 goto err_unregister_net_hooks;
8356 err = nf_register_net_hook(net, &hook->ops);
8358 flowtable->data.type->setup(&flowtable->data,
8361 goto err_unregister_net_hooks;
8369 err_unregister_net_hooks:
8370 list_for_each_entry_safe(hook, next, hook_list, list) {
8374 nft_unregister_flowtable_hook(net, flowtable, hook);
8375 list_del_rcu(&hook->list);
8376 kfree_rcu(hook, rcu);
8382 static void nft_hooks_destroy(struct list_head *hook_list)
8384 struct nft_hook *hook, *next;
8386 list_for_each_entry_safe(hook, next, hook_list, list) {
8387 list_del_rcu(&hook->list);
8388 kfree_rcu(hook, rcu);
8392 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8393 struct nft_flowtable *flowtable,
8394 struct netlink_ext_ack *extack)
8396 const struct nlattr * const *nla = ctx->nla;
8397 struct nft_flowtable_hook flowtable_hook;
8398 struct nft_hook *hook, *next;
8399 struct nft_trans *trans;
8400 bool unregister = false;
8404 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8409 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8410 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8411 list_del(&hook->list);
8416 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8417 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8418 if (flags & ~NFT_FLOWTABLE_MASK) {
8420 goto err_flowtable_update_hook;
8422 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8423 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8425 goto err_flowtable_update_hook;
8428 flags = flowtable->data.flags;
8431 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8432 &flowtable_hook.list, flowtable);
8434 goto err_flowtable_update_hook;
8436 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8437 sizeof(struct nft_trans_flowtable));
8441 goto err_flowtable_update_hook;
8444 nft_trans_flowtable_flags(trans) = flags;
8445 nft_trans_flowtable(trans) = flowtable;
8446 nft_trans_flowtable_update(trans) = true;
8447 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8448 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8450 nft_trans_commit_list_add_tail(ctx->net, trans);
8454 err_flowtable_update_hook:
8455 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8457 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8458 list_del_rcu(&hook->list);
8459 kfree_rcu(hook, rcu);
8466 static int nf_tables_newflowtable(struct sk_buff *skb,
8467 const struct nfnl_info *info,
8468 const struct nlattr * const nla[])
8470 struct netlink_ext_ack *extack = info->extack;
8471 struct nft_flowtable_hook flowtable_hook;
8472 u8 genmask = nft_genmask_next(info->net);
8473 u8 family = info->nfmsg->nfgen_family;
8474 const struct nf_flowtable_type *type;
8475 struct nft_flowtable *flowtable;
8476 struct net *net = info->net;
8477 struct nft_table *table;
8478 struct nft_trans *trans;
8482 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8483 !nla[NFTA_FLOWTABLE_NAME] ||
8484 !nla[NFTA_FLOWTABLE_HOOK])
8487 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8488 genmask, NETLINK_CB(skb).portid);
8489 if (IS_ERR(table)) {
8490 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8491 return PTR_ERR(table);
8494 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8496 if (IS_ERR(flowtable)) {
8497 err = PTR_ERR(flowtable);
8498 if (err != -ENOENT) {
8499 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8503 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8504 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8508 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8510 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8513 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8515 if (!nft_use_inc(&table->use))
8518 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8521 goto flowtable_alloc;
8524 flowtable->table = table;
8525 flowtable->handle = nf_tables_alloc_handle(table);
8526 INIT_LIST_HEAD(&flowtable->hook_list);
8528 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8529 if (!flowtable->name) {
8534 type = nft_flowtable_type_get(net, family);
8536 err = PTR_ERR(type);
8540 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8541 flowtable->data.flags =
8542 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8543 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8549 write_pnet(&flowtable->data.net, net);
8550 flowtable->data.type = type;
8551 err = type->init(&flowtable->data);
8555 err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8558 goto err_flowtable_parse_hooks;
8560 list_splice(&flowtable_hook.list, &flowtable->hook_list);
8561 flowtable->data.priority = flowtable_hook.priority;
8562 flowtable->hooknum = flowtable_hook.num;
8564 trans = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8565 if (IS_ERR(trans)) {
8566 err = PTR_ERR(trans);
8567 goto err_flowtable_trans;
8570 /* This must be LAST to ensure no packets are walking over this flowtable. */
8571 err = nft_register_flowtable_net_hooks(ctx.net, table,
8572 &flowtable->hook_list,
8575 goto err_flowtable_hooks;
8577 list_add_tail_rcu(&flowtable->list, &table->flowtables);
8581 err_flowtable_hooks:
8582 nft_trans_destroy(trans);
8583 err_flowtable_trans:
8584 nft_hooks_destroy(&flowtable->hook_list);
8585 err_flowtable_parse_hooks:
8586 flowtable->data.type->free(&flowtable->data);
8588 module_put(type->owner);
8590 kfree(flowtable->name);
8594 nft_use_dec_restore(&table->use);
8599 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8601 struct nft_hook *this, *next;
8603 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8604 list_del(&this->list);
8609 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8610 struct nft_flowtable *flowtable,
8611 struct netlink_ext_ack *extack)
8613 const struct nlattr * const *nla = ctx->nla;
8614 struct nft_flowtable_hook flowtable_hook;
8615 LIST_HEAD(flowtable_del_list);
8616 struct nft_hook *this, *hook;
8617 struct nft_trans *trans;
8620 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8625 list_for_each_entry(this, &flowtable_hook.list, list) {
8626 hook = nft_hook_list_find(&flowtable->hook_list, this);
8629 goto err_flowtable_del_hook;
8631 list_move(&hook->list, &flowtable_del_list);
8634 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8635 sizeof(struct nft_trans_flowtable));
8638 goto err_flowtable_del_hook;
8641 nft_trans_flowtable(trans) = flowtable;
8642 nft_trans_flowtable_update(trans) = true;
8643 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8644 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8645 nft_flowtable_hook_release(&flowtable_hook);
8647 nft_trans_commit_list_add_tail(ctx->net, trans);
8651 err_flowtable_del_hook:
8652 list_splice(&flowtable_del_list, &flowtable->hook_list);
8653 nft_flowtable_hook_release(&flowtable_hook);
8658 static int nf_tables_delflowtable(struct sk_buff *skb,
8659 const struct nfnl_info *info,
8660 const struct nlattr * const nla[])
8662 struct netlink_ext_ack *extack = info->extack;
8663 u8 genmask = nft_genmask_next(info->net);
8664 u8 family = info->nfmsg->nfgen_family;
8665 struct nft_flowtable *flowtable;
8666 struct net *net = info->net;
8667 const struct nlattr *attr;
8668 struct nft_table *table;
8671 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8672 (!nla[NFTA_FLOWTABLE_NAME] &&
8673 !nla[NFTA_FLOWTABLE_HANDLE]))
8676 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8677 genmask, NETLINK_CB(skb).portid);
8678 if (IS_ERR(table)) {
8679 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8680 return PTR_ERR(table);
8683 if (nla[NFTA_FLOWTABLE_HANDLE]) {
8684 attr = nla[NFTA_FLOWTABLE_HANDLE];
8685 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8687 attr = nla[NFTA_FLOWTABLE_NAME];
8688 flowtable = nft_flowtable_lookup(table, attr, genmask);
8691 if (IS_ERR(flowtable)) {
8692 if (PTR_ERR(flowtable) == -ENOENT &&
8693 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8696 NL_SET_BAD_ATTR(extack, attr);
8697 return PTR_ERR(flowtable);
8700 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8702 if (nla[NFTA_FLOWTABLE_HOOK])
8703 return nft_delflowtable_hook(&ctx, flowtable, extack);
8705 if (flowtable->use > 0) {
8706 NL_SET_BAD_ATTR(extack, attr);
8710 return nft_delflowtable(&ctx, flowtable);
8713 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8714 u32 portid, u32 seq, int event,
8715 u32 flags, int family,
8716 struct nft_flowtable *flowtable,
8717 struct list_head *hook_list)
8719 struct nlattr *nest, *nest_devs;
8720 struct nft_hook *hook;
8721 struct nlmsghdr *nlh;
8723 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8724 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8725 NFNETLINK_V0, nft_base_seq(net));
8727 goto nla_put_failure;
8729 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8730 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8731 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8732 NFTA_FLOWTABLE_PAD))
8733 goto nla_put_failure;
8735 if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8736 nlmsg_end(skb, nlh);
8740 if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8741 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8742 goto nla_put_failure;
8744 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8746 goto nla_put_failure;
8747 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8748 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8749 goto nla_put_failure;
8751 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8753 goto nla_put_failure;
8756 hook_list = &flowtable->hook_list;
8758 list_for_each_entry_rcu(hook, hook_list, list) {
8759 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8760 goto nla_put_failure;
8762 nla_nest_end(skb, nest_devs);
8763 nla_nest_end(skb, nest);
8765 nlmsg_end(skb, nlh);
8769 nlmsg_trim(skb, nlh);
8773 struct nft_flowtable_filter {
8777 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8778 struct netlink_callback *cb)
8780 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8781 struct nft_flowtable_filter *filter = cb->data;
8782 unsigned int idx = 0, s_idx = cb->args[0];
8783 struct net *net = sock_net(skb->sk);
8784 int family = nfmsg->nfgen_family;
8785 struct nft_flowtable *flowtable;
8786 struct nftables_pernet *nft_net;
8787 const struct nft_table *table;
8790 nft_net = nft_pernet(net);
8791 cb->seq = READ_ONCE(nft_net->base_seq);
8793 list_for_each_entry_rcu(table, &nft_net->tables, list) {
8794 if (family != NFPROTO_UNSPEC && family != table->family)
8797 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8798 if (!nft_is_active(net, flowtable))
8803 memset(&cb->args[1], 0,
8804 sizeof(cb->args) - sizeof(cb->args[0]));
8805 if (filter && filter->table &&
8806 strcmp(filter->table, table->name))
8809 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8811 NFT_MSG_NEWFLOWTABLE,
8812 NLM_F_MULTI | NLM_F_APPEND,
8814 flowtable, NULL) < 0)
8817 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8829 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8831 const struct nlattr * const *nla = cb->data;
8832 struct nft_flowtable_filter *filter = NULL;
8834 if (nla[NFTA_FLOWTABLE_TABLE]) {
8835 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8839 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8841 if (!filter->table) {
8851 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8853 struct nft_flowtable_filter *filter = cb->data;
8858 kfree(filter->table);
8864 /* called with rcu_read_lock held */
8865 static int nf_tables_getflowtable(struct sk_buff *skb,
8866 const struct nfnl_info *info,
8867 const struct nlattr * const nla[])
8869 struct netlink_ext_ack *extack = info->extack;
8870 u8 genmask = nft_genmask_cur(info->net);
8871 u8 family = info->nfmsg->nfgen_family;
8872 struct nft_flowtable *flowtable;
8873 const struct nft_table *table;
8874 struct net *net = info->net;
8875 struct sk_buff *skb2;
8878 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8879 struct netlink_dump_control c = {
8880 .start = nf_tables_dump_flowtable_start,
8881 .dump = nf_tables_dump_flowtable,
8882 .done = nf_tables_dump_flowtable_done,
8883 .module = THIS_MODULE,
8884 .data = (void *)nla,
8887 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8890 if (!nla[NFTA_FLOWTABLE_NAME])
8893 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8895 if (IS_ERR(table)) {
8896 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8897 return PTR_ERR(table);
8900 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8902 if (IS_ERR(flowtable)) {
8903 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8904 return PTR_ERR(flowtable);
8907 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8911 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8912 info->nlh->nlmsg_seq,
8913 NFT_MSG_NEWFLOWTABLE, 0, family,
8916 goto err_fill_flowtable_info;
8918 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8920 err_fill_flowtable_info:
8925 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8926 struct nft_flowtable *flowtable,
8927 struct list_head *hook_list, int event)
8929 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8930 struct sk_buff *skb;
8935 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8938 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8942 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8943 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8945 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8946 ctx->seq, event, flags,
8947 ctx->family, flowtable, hook_list);
8953 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8956 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8959 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8961 struct nft_hook *hook, *next;
8963 flowtable->data.type->free(&flowtable->data);
8964 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8965 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8967 list_del_rcu(&hook->list);
8970 kfree(flowtable->name);
8971 module_put(flowtable->data.type->owner);
8975 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8976 u32 portid, u32 seq)
8978 struct nftables_pernet *nft_net = nft_pernet(net);
8979 struct nlmsghdr *nlh;
8980 char buf[TASK_COMM_LEN];
8981 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8983 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8984 NFNETLINK_V0, nft_base_seq(net));
8986 goto nla_put_failure;
8988 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8989 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8990 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8991 goto nla_put_failure;
8993 nlmsg_end(skb, nlh);
8997 nlmsg_trim(skb, nlh);
9001 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
9002 struct nft_flowtable *flowtable)
9004 struct nft_hook *hook;
9006 list_for_each_entry(hook, &flowtable->hook_list, list) {
9007 if (hook->ops.dev != dev)
9010 /* flow_offload_netdev_event() cleans up entries for us. */
9011 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
9012 list_del_rcu(&hook->list);
9013 kfree_rcu(hook, rcu);
9018 static int nf_tables_flowtable_event(struct notifier_block *this,
9019 unsigned long event, void *ptr)
9021 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
9022 struct nft_flowtable *flowtable;
9023 struct nftables_pernet *nft_net;
9024 struct nft_table *table;
9027 if (event != NETDEV_UNREGISTER)
9031 nft_net = nft_pernet(net);
9032 mutex_lock(&nft_net->commit_mutex);
9033 list_for_each_entry(table, &nft_net->tables, list) {
9034 list_for_each_entry(flowtable, &table->flowtables, list) {
9035 nft_flowtable_event(event, dev, flowtable);
9038 mutex_unlock(&nft_net->commit_mutex);
9043 static struct notifier_block nf_tables_flowtable_notifier = {
9044 .notifier_call = nf_tables_flowtable_event,
9047 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
9050 struct nlmsghdr *nlh = nlmsg_hdr(skb);
9051 struct sk_buff *skb2;
9054 if (!nlmsg_report(nlh) &&
9055 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
9058 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
9062 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
9069 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
9070 nlmsg_report(nlh), GFP_KERNEL);
9073 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
9077 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
9078 const struct nlattr * const nla[])
9080 struct sk_buff *skb2;
9083 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
9087 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
9088 info->nlh->nlmsg_seq);
9090 goto err_fill_gen_info;
9092 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
9099 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
9100 [NFT_MSG_NEWTABLE] = {
9101 .call = nf_tables_newtable,
9102 .type = NFNL_CB_BATCH,
9103 .attr_count = NFTA_TABLE_MAX,
9104 .policy = nft_table_policy,
9106 [NFT_MSG_GETTABLE] = {
9107 .call = nf_tables_gettable,
9108 .type = NFNL_CB_RCU,
9109 .attr_count = NFTA_TABLE_MAX,
9110 .policy = nft_table_policy,
9112 [NFT_MSG_DELTABLE] = {
9113 .call = nf_tables_deltable,
9114 .type = NFNL_CB_BATCH,
9115 .attr_count = NFTA_TABLE_MAX,
9116 .policy = nft_table_policy,
9118 [NFT_MSG_DESTROYTABLE] = {
9119 .call = nf_tables_deltable,
9120 .type = NFNL_CB_BATCH,
9121 .attr_count = NFTA_TABLE_MAX,
9122 .policy = nft_table_policy,
9124 [NFT_MSG_NEWCHAIN] = {
9125 .call = nf_tables_newchain,
9126 .type = NFNL_CB_BATCH,
9127 .attr_count = NFTA_CHAIN_MAX,
9128 .policy = nft_chain_policy,
9130 [NFT_MSG_GETCHAIN] = {
9131 .call = nf_tables_getchain,
9132 .type = NFNL_CB_RCU,
9133 .attr_count = NFTA_CHAIN_MAX,
9134 .policy = nft_chain_policy,
9136 [NFT_MSG_DELCHAIN] = {
9137 .call = nf_tables_delchain,
9138 .type = NFNL_CB_BATCH,
9139 .attr_count = NFTA_CHAIN_MAX,
9140 .policy = nft_chain_policy,
9142 [NFT_MSG_DESTROYCHAIN] = {
9143 .call = nf_tables_delchain,
9144 .type = NFNL_CB_BATCH,
9145 .attr_count = NFTA_CHAIN_MAX,
9146 .policy = nft_chain_policy,
9148 [NFT_MSG_NEWRULE] = {
9149 .call = nf_tables_newrule,
9150 .type = NFNL_CB_BATCH,
9151 .attr_count = NFTA_RULE_MAX,
9152 .policy = nft_rule_policy,
9154 [NFT_MSG_GETRULE] = {
9155 .call = nf_tables_getrule,
9156 .type = NFNL_CB_RCU,
9157 .attr_count = NFTA_RULE_MAX,
9158 .policy = nft_rule_policy,
9160 [NFT_MSG_GETRULE_RESET] = {
9161 .call = nf_tables_getrule_reset,
9162 .type = NFNL_CB_RCU,
9163 .attr_count = NFTA_RULE_MAX,
9164 .policy = nft_rule_policy,
9166 [NFT_MSG_DELRULE] = {
9167 .call = nf_tables_delrule,
9168 .type = NFNL_CB_BATCH,
9169 .attr_count = NFTA_RULE_MAX,
9170 .policy = nft_rule_policy,
9172 [NFT_MSG_DESTROYRULE] = {
9173 .call = nf_tables_delrule,
9174 .type = NFNL_CB_BATCH,
9175 .attr_count = NFTA_RULE_MAX,
9176 .policy = nft_rule_policy,
9178 [NFT_MSG_NEWSET] = {
9179 .call = nf_tables_newset,
9180 .type = NFNL_CB_BATCH,
9181 .attr_count = NFTA_SET_MAX,
9182 .policy = nft_set_policy,
9184 [NFT_MSG_GETSET] = {
9185 .call = nf_tables_getset,
9186 .type = NFNL_CB_RCU,
9187 .attr_count = NFTA_SET_MAX,
9188 .policy = nft_set_policy,
9190 [NFT_MSG_DELSET] = {
9191 .call = nf_tables_delset,
9192 .type = NFNL_CB_BATCH,
9193 .attr_count = NFTA_SET_MAX,
9194 .policy = nft_set_policy,
9196 [NFT_MSG_DESTROYSET] = {
9197 .call = nf_tables_delset,
9198 .type = NFNL_CB_BATCH,
9199 .attr_count = NFTA_SET_MAX,
9200 .policy = nft_set_policy,
9202 [NFT_MSG_NEWSETELEM] = {
9203 .call = nf_tables_newsetelem,
9204 .type = NFNL_CB_BATCH,
9205 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9206 .policy = nft_set_elem_list_policy,
9208 [NFT_MSG_GETSETELEM] = {
9209 .call = nf_tables_getsetelem,
9210 .type = NFNL_CB_RCU,
9211 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9212 .policy = nft_set_elem_list_policy,
9214 [NFT_MSG_GETSETELEM_RESET] = {
9215 .call = nf_tables_getsetelem_reset,
9216 .type = NFNL_CB_RCU,
9217 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9218 .policy = nft_set_elem_list_policy,
9220 [NFT_MSG_DELSETELEM] = {
9221 .call = nf_tables_delsetelem,
9222 .type = NFNL_CB_BATCH,
9223 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9224 .policy = nft_set_elem_list_policy,
9226 [NFT_MSG_DESTROYSETELEM] = {
9227 .call = nf_tables_delsetelem,
9228 .type = NFNL_CB_BATCH,
9229 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9230 .policy = nft_set_elem_list_policy,
9232 [NFT_MSG_GETGEN] = {
9233 .call = nf_tables_getgen,
9234 .type = NFNL_CB_RCU,
9236 [NFT_MSG_NEWOBJ] = {
9237 .call = nf_tables_newobj,
9238 .type = NFNL_CB_BATCH,
9239 .attr_count = NFTA_OBJ_MAX,
9240 .policy = nft_obj_policy,
9242 [NFT_MSG_GETOBJ] = {
9243 .call = nf_tables_getobj,
9244 .type = NFNL_CB_RCU,
9245 .attr_count = NFTA_OBJ_MAX,
9246 .policy = nft_obj_policy,
9248 [NFT_MSG_DELOBJ] = {
9249 .call = nf_tables_delobj,
9250 .type = NFNL_CB_BATCH,
9251 .attr_count = NFTA_OBJ_MAX,
9252 .policy = nft_obj_policy,
9254 [NFT_MSG_DESTROYOBJ] = {
9255 .call = nf_tables_delobj,
9256 .type = NFNL_CB_BATCH,
9257 .attr_count = NFTA_OBJ_MAX,
9258 .policy = nft_obj_policy,
9260 [NFT_MSG_GETOBJ_RESET] = {
9261 .call = nf_tables_getobj,
9262 .type = NFNL_CB_RCU,
9263 .attr_count = NFTA_OBJ_MAX,
9264 .policy = nft_obj_policy,
9266 [NFT_MSG_NEWFLOWTABLE] = {
9267 .call = nf_tables_newflowtable,
9268 .type = NFNL_CB_BATCH,
9269 .attr_count = NFTA_FLOWTABLE_MAX,
9270 .policy = nft_flowtable_policy,
9272 [NFT_MSG_GETFLOWTABLE] = {
9273 .call = nf_tables_getflowtable,
9274 .type = NFNL_CB_RCU,
9275 .attr_count = NFTA_FLOWTABLE_MAX,
9276 .policy = nft_flowtable_policy,
9278 [NFT_MSG_DELFLOWTABLE] = {
9279 .call = nf_tables_delflowtable,
9280 .type = NFNL_CB_BATCH,
9281 .attr_count = NFTA_FLOWTABLE_MAX,
9282 .policy = nft_flowtable_policy,
9284 [NFT_MSG_DESTROYFLOWTABLE] = {
9285 .call = nf_tables_delflowtable,
9286 .type = NFNL_CB_BATCH,
9287 .attr_count = NFTA_FLOWTABLE_MAX,
9288 .policy = nft_flowtable_policy,
9292 static int nf_tables_validate(struct net *net)
9294 struct nftables_pernet *nft_net = nft_pernet(net);
9295 struct nft_table *table;
9297 list_for_each_entry(table, &nft_net->tables, list) {
9298 switch (table->validate_state) {
9299 case NFT_VALIDATE_SKIP:
9301 case NFT_VALIDATE_NEED:
9302 nft_validate_state_update(table, NFT_VALIDATE_DO);
9304 case NFT_VALIDATE_DO:
9305 if (nft_table_validate(net, table) < 0)
9308 nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9316 /* a drop policy has to be deferred until all rules have been activated,
9317 * otherwise a large ruleset that contains a drop-policy base chain will
9318 * cause all packets to get dropped until the full transaction has been
9321 * We defer the drop policy until the transaction has been finalized.
9323 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9325 struct nft_base_chain *basechain;
9327 if (nft_trans_chain_policy(trans) != NF_DROP)
9330 if (!nft_is_base_chain(trans->ctx.chain))
9333 basechain = nft_base_chain(trans->ctx.chain);
9334 basechain->policy = NF_DROP;
9337 static void nft_chain_commit_update(struct nft_trans *trans)
9339 struct nft_base_chain *basechain;
9341 if (nft_trans_chain_name(trans)) {
9342 rhltable_remove(&trans->ctx.table->chains_ht,
9343 &trans->ctx.chain->rhlhead,
9344 nft_chain_ht_params);
9345 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9346 rhltable_insert_key(&trans->ctx.table->chains_ht,
9347 trans->ctx.chain->name,
9348 &trans->ctx.chain->rhlhead,
9349 nft_chain_ht_params);
9352 if (!nft_is_base_chain(trans->ctx.chain))
9355 nft_chain_stats_replace(trans);
9357 basechain = nft_base_chain(trans->ctx.chain);
9359 switch (nft_trans_chain_policy(trans)) {
9362 basechain->policy = nft_trans_chain_policy(trans);
9367 static void nft_obj_commit_update(struct nft_trans *trans)
9369 struct nft_object *newobj;
9370 struct nft_object *obj;
9372 obj = nft_trans_obj(trans);
9373 newobj = nft_trans_obj_newobj(trans);
9375 if (obj->ops->update)
9376 obj->ops->update(obj, newobj);
9378 nft_obj_destroy(&trans->ctx, newobj);
9381 static void nft_commit_release(struct nft_trans *trans)
9383 switch (trans->msg_type) {
9384 case NFT_MSG_DELTABLE:
9385 case NFT_MSG_DESTROYTABLE:
9386 nf_tables_table_destroy(&trans->ctx);
9388 case NFT_MSG_NEWCHAIN:
9389 free_percpu(nft_trans_chain_stats(trans));
9390 kfree(nft_trans_chain_name(trans));
9392 case NFT_MSG_DELCHAIN:
9393 case NFT_MSG_DESTROYCHAIN:
9394 if (nft_trans_chain_update(trans))
9395 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9397 nf_tables_chain_destroy(&trans->ctx);
9399 case NFT_MSG_DELRULE:
9400 case NFT_MSG_DESTROYRULE:
9401 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9403 case NFT_MSG_DELSET:
9404 case NFT_MSG_DESTROYSET:
9405 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9407 case NFT_MSG_DELSETELEM:
9408 case NFT_MSG_DESTROYSETELEM:
9409 nf_tables_set_elem_destroy(&trans->ctx,
9410 nft_trans_elem_set(trans),
9411 nft_trans_elem_priv(trans));
9413 case NFT_MSG_DELOBJ:
9414 case NFT_MSG_DESTROYOBJ:
9415 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9417 case NFT_MSG_DELFLOWTABLE:
9418 case NFT_MSG_DESTROYFLOWTABLE:
9419 if (nft_trans_flowtable_update(trans))
9420 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9422 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9427 put_net(trans->ctx.net);
9432 static void nf_tables_trans_destroy_work(struct work_struct *w)
9434 struct nft_trans *trans, *next;
9437 spin_lock(&nf_tables_destroy_list_lock);
9438 list_splice_init(&nf_tables_destroy_list, &head);
9439 spin_unlock(&nf_tables_destroy_list_lock);
9441 if (list_empty(&head))
9446 list_for_each_entry_safe(trans, next, &head, list) {
9447 nft_trans_list_del(trans);
9448 nft_commit_release(trans);
9452 void nf_tables_trans_destroy_flush_work(void)
9454 flush_work(&trans_destroy_work);
9456 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9458 static bool nft_expr_reduce(struct nft_regs_track *track,
9459 const struct nft_expr *expr)
9464 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9466 const struct nft_expr *expr, *last;
9467 struct nft_regs_track track = {};
9468 unsigned int size, data_size;
9469 void *data, *data_boundary;
9470 struct nft_rule_dp *prule;
9471 struct nft_rule *rule;
9473 /* already handled or inactive chain? */
9474 if (chain->blob_next || !nft_is_active_next(net, chain))
9478 list_for_each_entry(rule, &chain->rules, list) {
9479 if (nft_is_active_next(net, rule)) {
9480 data_size += sizeof(*prule) + rule->dlen;
9481 if (data_size > INT_MAX)
9486 chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9487 if (!chain->blob_next)
9490 data = (void *)chain->blob_next->data;
9491 data_boundary = data + data_size;
9494 list_for_each_entry(rule, &chain->rules, list) {
9495 if (!nft_is_active_next(net, rule))
9498 prule = (struct nft_rule_dp *)data;
9499 data += offsetof(struct nft_rule_dp, data);
9500 if (WARN_ON_ONCE(data > data_boundary))
9504 track.last = nft_expr_last(rule);
9505 nft_rule_for_each_expr(expr, last, rule) {
9508 if (nft_expr_reduce(&track, expr)) {
9513 if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9516 memcpy(data + size, expr, expr->ops->size);
9517 size += expr->ops->size;
9519 if (WARN_ON_ONCE(size >= 1 << 12))
9522 prule->handle = rule->handle;
9528 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9531 if (WARN_ON_ONCE(data > data_boundary))
9534 prule = (struct nft_rule_dp *)data;
9535 nft_last_rule(chain, prule);
9540 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9542 struct nftables_pernet *nft_net = nft_pernet(net);
9543 struct nft_trans *trans, *next;
9545 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9546 struct nft_chain *chain = trans->ctx.chain;
9548 if (trans->msg_type == NFT_MSG_NEWRULE ||
9549 trans->msg_type == NFT_MSG_DELRULE) {
9550 kvfree(chain->blob_next);
9551 chain->blob_next = NULL;
9556 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9558 struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9563 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9565 struct nft_rule_dp_last *last;
9567 /* last rule trailer is after end marker */
9568 last = (void *)blob + sizeof(*blob) + blob->size;
9571 call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9574 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9576 struct nft_rule_blob *g0, *g1;
9579 next_genbit = nft_gencursor_next(net);
9581 g0 = rcu_dereference_protected(chain->blob_gen_0,
9582 lockdep_commit_lock_is_held(net));
9583 g1 = rcu_dereference_protected(chain->blob_gen_1,
9584 lockdep_commit_lock_is_held(net));
9586 /* No changes to this chain? */
9587 if (chain->blob_next == NULL) {
9588 /* chain had no change in last or next generation */
9592 * chain had no change in this generation; make sure next
9593 * one uses same rules as current generation.
9596 rcu_assign_pointer(chain->blob_gen_1, g0);
9597 nf_tables_commit_chain_free_rules_old(g1);
9599 rcu_assign_pointer(chain->blob_gen_0, g1);
9600 nf_tables_commit_chain_free_rules_old(g0);
9607 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9609 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9611 chain->blob_next = NULL;
9617 nf_tables_commit_chain_free_rules_old(g1);
9619 nf_tables_commit_chain_free_rules_old(g0);
9622 static void nft_obj_del(struct nft_object *obj)
9624 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9625 list_del_rcu(&obj->list);
9628 void nft_chain_del(struct nft_chain *chain)
9630 struct nft_table *table = chain->table;
9632 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9633 nft_chain_ht_params));
9634 list_del_rcu(&chain->list);
9637 static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
9638 struct nft_trans_gc *trans)
9640 struct nft_elem_priv **priv = trans->priv;
9643 for (i = 0; i < trans->count; i++) {
9644 nft_setelem_data_deactivate(ctx->net, trans->set, priv[i]);
9645 nft_setelem_remove(ctx->net, trans->set, priv[i]);
9649 void nft_trans_gc_destroy(struct nft_trans_gc *trans)
9651 nft_set_put(trans->set);
9652 put_net(trans->net);
9656 static void nft_trans_gc_trans_free(struct rcu_head *rcu)
9658 struct nft_elem_priv *elem_priv;
9659 struct nft_trans_gc *trans;
9660 struct nft_ctx ctx = {};
9663 trans = container_of(rcu, struct nft_trans_gc, rcu);
9664 ctx.net = read_pnet(&trans->set->net);
9666 for (i = 0; i < trans->count; i++) {
9667 elem_priv = trans->priv[i];
9668 if (!nft_setelem_is_catchall(trans->set, elem_priv))
9669 atomic_dec(&trans->set->nelems);
9671 nf_tables_set_elem_destroy(&ctx, trans->set, elem_priv);
9674 nft_trans_gc_destroy(trans);
9677 static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
9679 struct nftables_pernet *nft_net;
9680 struct nft_ctx ctx = {};
9682 nft_net = nft_pernet(trans->net);
9684 mutex_lock(&nft_net->commit_mutex);
9686 /* Check for race with transaction, otherwise this batch refers to
9687 * stale objects that might not be there anymore. Skip transaction if
9688 * set has been destroyed from control plane transaction in case gc
9689 * worker loses race.
9691 if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
9692 mutex_unlock(&nft_net->commit_mutex);
9696 ctx.net = trans->net;
9697 ctx.table = trans->set->table;
9699 nft_trans_gc_setelem_remove(&ctx, trans);
9700 mutex_unlock(&nft_net->commit_mutex);
9705 static void nft_trans_gc_work(struct work_struct *work)
9707 struct nft_trans_gc *trans, *next;
9708 LIST_HEAD(trans_gc_list);
9710 spin_lock(&nf_tables_gc_list_lock);
9711 list_splice_init(&nf_tables_gc_list, &trans_gc_list);
9712 spin_unlock(&nf_tables_gc_list_lock);
9714 list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
9715 list_del(&trans->list);
9716 if (!nft_trans_gc_work_done(trans)) {
9717 nft_trans_gc_destroy(trans);
9720 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9724 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
9725 unsigned int gc_seq, gfp_t gfp)
9727 struct net *net = read_pnet(&set->net);
9728 struct nft_trans_gc *trans;
9730 trans = kzalloc(sizeof(*trans), gfp);
9734 trans->net = maybe_get_net(net);
9740 refcount_inc(&set->refs);
9742 trans->seq = gc_seq;
9747 void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
9749 trans->priv[trans->count++] = priv;
9752 static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
9754 spin_lock(&nf_tables_gc_list_lock);
9755 list_add_tail(&trans->list, &nf_tables_gc_list);
9756 spin_unlock(&nf_tables_gc_list_lock);
9758 schedule_work(&trans_gc_work);
9761 static int nft_trans_gc_space(struct nft_trans_gc *trans)
9763 return NFT_TRANS_GC_BATCHCOUNT - trans->count;
9766 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
9767 unsigned int gc_seq, gfp_t gfp)
9769 struct nft_set *set;
9771 if (nft_trans_gc_space(gc))
9775 nft_trans_gc_queue_work(gc);
9777 return nft_trans_gc_alloc(set, gc_seq, gfp);
9780 void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
9782 if (trans->count == 0) {
9783 nft_trans_gc_destroy(trans);
9787 nft_trans_gc_queue_work(trans);
9790 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
9792 struct nft_set *set;
9794 if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
9797 if (nft_trans_gc_space(gc))
9801 call_rcu(&gc->rcu, nft_trans_gc_trans_free);
9803 return nft_trans_gc_alloc(set, 0, gfp);
9806 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
9808 WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
9810 if (trans->count == 0) {
9811 nft_trans_gc_destroy(trans);
9815 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9818 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
9819 unsigned int gc_seq)
9821 struct nft_set_elem_catchall *catchall;
9822 const struct nft_set *set = gc->set;
9823 struct nft_set_ext *ext;
9825 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9826 ext = nft_set_elem_ext(set, catchall->elem);
9828 if (!nft_set_elem_expired(ext))
9830 if (nft_set_elem_is_dead(ext))
9833 nft_set_elem_dead(ext);
9835 gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
9839 nft_trans_gc_elem_add(gc, catchall->elem);
9845 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc)
9847 struct nft_set_elem_catchall *catchall, *next;
9848 u64 tstamp = nft_net_tstamp(gc->net);
9849 const struct nft_set *set = gc->set;
9850 struct nft_elem_priv *elem_priv;
9851 struct nft_set_ext *ext;
9853 WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net));
9855 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
9856 ext = nft_set_elem_ext(set, catchall->elem);
9858 if (!__nft_set_elem_expired(ext, tstamp))
9861 gc = nft_trans_gc_queue_sync(gc, GFP_KERNEL);
9865 elem_priv = catchall->elem;
9866 nft_setelem_data_deactivate(gc->net, gc->set, elem_priv);
9867 nft_setelem_catchall_destroy(catchall);
9868 nft_trans_gc_elem_add(gc, elem_priv);
9874 static void nf_tables_module_autoload_cleanup(struct net *net)
9876 struct nftables_pernet *nft_net = nft_pernet(net);
9877 struct nft_module_request *req, *next;
9879 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9880 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9881 WARN_ON_ONCE(!req->done);
9882 list_del(&req->list);
9887 static void nf_tables_commit_release(struct net *net)
9889 struct nftables_pernet *nft_net = nft_pernet(net);
9890 struct nft_trans *trans;
9892 /* all side effects have to be made visible.
9893 * For example, if a chain named 'foo' has been deleted, a
9894 * new transaction must not find it anymore.
9896 * Memory reclaim happens asynchronously from work queue
9897 * to prevent expensive synchronize_rcu() in commit phase.
9899 if (list_empty(&nft_net->commit_list)) {
9900 nf_tables_module_autoload_cleanup(net);
9901 mutex_unlock(&nft_net->commit_mutex);
9905 trans = list_last_entry(&nft_net->commit_list,
9906 struct nft_trans, list);
9907 get_net(trans->ctx.net);
9908 WARN_ON_ONCE(trans->put_net);
9910 trans->put_net = true;
9911 spin_lock(&nf_tables_destroy_list_lock);
9912 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9913 spin_unlock(&nf_tables_destroy_list_lock);
9915 nf_tables_module_autoload_cleanup(net);
9916 schedule_work(&trans_destroy_work);
9918 mutex_unlock(&nft_net->commit_mutex);
9921 static void nft_commit_notify(struct net *net, u32 portid)
9923 struct nftables_pernet *nft_net = nft_pernet(net);
9924 struct sk_buff *batch_skb = NULL, *nskb, *skb;
9925 unsigned char *data;
9928 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9932 len = NLMSG_GOODSIZE - skb->len;
9933 list_del(&skb->list);
9937 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9938 data = skb_put(batch_skb, skb->len);
9939 memcpy(data, skb->data, skb->len);
9940 list_del(&skb->list);
9944 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9945 NFT_CB(batch_skb).report, GFP_KERNEL);
9950 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9951 NFT_CB(batch_skb).report, GFP_KERNEL);
9954 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9957 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9958 struct nft_table *table)
9960 struct nft_audit_data *adp;
9962 list_for_each_entry(adp, adl, list) {
9963 if (adp->table == table)
9966 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9970 list_add(&adp->list, adl);
9974 static void nf_tables_commit_audit_free(struct list_head *adl)
9976 struct nft_audit_data *adp, *adn;
9978 list_for_each_entry_safe(adp, adn, adl, list) {
9979 list_del(&adp->list);
9984 static void nf_tables_commit_audit_collect(struct list_head *adl,
9985 struct nft_table *table, u32 op)
9987 struct nft_audit_data *adp;
9989 list_for_each_entry(adp, adl, list) {
9990 if (adp->table == table)
9993 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9997 if (!adp->op || adp->op > op)
10001 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
10003 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
10005 struct nft_audit_data *adp, *adn;
10006 char aubuf[AUNFTABLENAMELEN];
10008 list_for_each_entry_safe(adp, adn, adl, list) {
10009 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
10011 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
10012 nft2audit_op[adp->op], GFP_KERNEL);
10013 list_del(&adp->list);
10018 static void nft_set_commit_update(struct list_head *set_update_list)
10020 struct nft_set *set, *next;
10022 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10023 list_del_init(&set->pending_update);
10025 if (!set->ops->commit || set->dead)
10028 set->ops->commit(set);
10032 static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
10034 unsigned int gc_seq;
10036 /* Bump gc counter, it becomes odd, this is the busy mark. */
10037 gc_seq = READ_ONCE(nft_net->gc_seq);
10038 WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
10043 static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
10045 WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
10048 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
10050 struct nftables_pernet *nft_net = nft_pernet(net);
10051 struct nft_trans *trans, *next;
10052 unsigned int base_seq, gc_seq;
10053 LIST_HEAD(set_update_list);
10054 struct nft_trans_elem *te;
10055 struct nft_chain *chain;
10056 struct nft_table *table;
10060 if (list_empty(&nft_net->commit_list)) {
10061 mutex_unlock(&nft_net->commit_mutex);
10065 list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
10066 switch (trans->msg_type) {
10067 case NFT_MSG_NEWSET:
10068 if (!nft_trans_set_update(trans) &&
10069 nft_set_is_anonymous(nft_trans_set(trans)) &&
10070 !nft_trans_set_bound(trans)) {
10071 pr_warn_once("nftables ruleset with unbound set\n");
10075 case NFT_MSG_NEWCHAIN:
10076 if (!nft_trans_chain_update(trans) &&
10077 nft_chain_binding(nft_trans_chain(trans)) &&
10078 !nft_trans_chain_bound(trans)) {
10079 pr_warn_once("nftables ruleset with unbound chain\n");
10086 /* 0. Validate ruleset, otherwise roll back for error reporting. */
10087 if (nf_tables_validate(net) < 0) {
10088 nft_net->validate_state = NFT_VALIDATE_DO;
10092 err = nft_flow_rule_offload_commit(net);
10096 /* 1. Allocate space for next generation rules_gen_X[] */
10097 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10100 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
10102 nf_tables_commit_chain_prepare_cancel(net);
10103 nf_tables_commit_audit_free(&adl);
10106 if (trans->msg_type == NFT_MSG_NEWRULE ||
10107 trans->msg_type == NFT_MSG_DELRULE) {
10108 chain = trans->ctx.chain;
10110 ret = nf_tables_commit_chain_prepare(net, chain);
10112 nf_tables_commit_chain_prepare_cancel(net);
10113 nf_tables_commit_audit_free(&adl);
10119 /* step 2. Make rules_gen_X visible to packet path */
10120 list_for_each_entry(table, &nft_net->tables, list) {
10121 list_for_each_entry(chain, &table->chains, list)
10122 nf_tables_commit_chain(net, chain);
10126 * Bump generation counter, invalidate any dump in progress.
10127 * Cannot fail after this point.
10129 base_seq = READ_ONCE(nft_net->base_seq);
10130 while (++base_seq == 0)
10133 WRITE_ONCE(nft_net->base_seq, base_seq);
10135 gc_seq = nft_gc_seq_begin(nft_net);
10137 /* step 3. Start new generation, rules_gen_X now in use. */
10138 net->nft.gencursor = nft_gencursor_next(net);
10140 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10141 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
10143 switch (trans->msg_type) {
10144 case NFT_MSG_NEWTABLE:
10145 if (nft_trans_table_update(trans)) {
10146 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10147 nft_trans_destroy(trans);
10150 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
10151 nf_tables_table_disable(net, trans->ctx.table);
10153 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10155 nft_clear(net, trans->ctx.table);
10157 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
10158 nft_trans_destroy(trans);
10160 case NFT_MSG_DELTABLE:
10161 case NFT_MSG_DESTROYTABLE:
10162 list_del_rcu(&trans->ctx.table->list);
10163 nf_tables_table_notify(&trans->ctx, trans->msg_type);
10165 case NFT_MSG_NEWCHAIN:
10166 if (nft_trans_chain_update(trans)) {
10167 nft_chain_commit_update(trans);
10168 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
10169 &nft_trans_chain_hooks(trans));
10170 list_splice(&nft_trans_chain_hooks(trans),
10171 &nft_trans_basechain(trans)->hook_list);
10172 /* trans destroyed after rcu grace period */
10174 nft_chain_commit_drop_policy(trans);
10175 nft_clear(net, trans->ctx.chain);
10176 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
10177 nft_trans_destroy(trans);
10180 case NFT_MSG_DELCHAIN:
10181 case NFT_MSG_DESTROYCHAIN:
10182 if (nft_trans_chain_update(trans)) {
10183 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10184 &nft_trans_chain_hooks(trans));
10185 nft_netdev_unregister_hooks(net,
10186 &nft_trans_chain_hooks(trans),
10189 nft_chain_del(trans->ctx.chain);
10190 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10192 nf_tables_unregister_hook(trans->ctx.net,
10197 case NFT_MSG_NEWRULE:
10198 nft_clear(trans->ctx.net, nft_trans_rule(trans));
10199 nf_tables_rule_notify(&trans->ctx,
10200 nft_trans_rule(trans),
10202 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10203 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10205 nft_trans_destroy(trans);
10207 case NFT_MSG_DELRULE:
10208 case NFT_MSG_DESTROYRULE:
10209 list_del_rcu(&nft_trans_rule(trans)->list);
10210 nf_tables_rule_notify(&trans->ctx,
10211 nft_trans_rule(trans),
10213 nft_rule_expr_deactivate(&trans->ctx,
10214 nft_trans_rule(trans),
10217 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10218 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10220 case NFT_MSG_NEWSET:
10221 if (nft_trans_set_update(trans)) {
10222 struct nft_set *set = nft_trans_set(trans);
10224 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
10225 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
10227 if (nft_trans_set_size(trans))
10228 WRITE_ONCE(set->size, nft_trans_set_size(trans));
10230 nft_clear(net, nft_trans_set(trans));
10231 /* This avoids hitting -EBUSY when deleting the table
10232 * from the transaction.
10234 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
10235 !list_empty(&nft_trans_set(trans)->bindings))
10236 nft_use_dec(&trans->ctx.table->use);
10238 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10239 NFT_MSG_NEWSET, GFP_KERNEL);
10240 nft_trans_destroy(trans);
10242 case NFT_MSG_DELSET:
10243 case NFT_MSG_DESTROYSET:
10244 nft_trans_set(trans)->dead = 1;
10245 list_del_rcu(&nft_trans_set(trans)->list);
10246 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10247 trans->msg_type, GFP_KERNEL);
10249 case NFT_MSG_NEWSETELEM:
10250 te = (struct nft_trans_elem *)trans->data;
10252 nft_setelem_activate(net, te->set, te->elem_priv);
10253 nf_tables_setelem_notify(&trans->ctx, te->set,
10255 NFT_MSG_NEWSETELEM);
10256 if (te->set->ops->commit &&
10257 list_empty(&te->set->pending_update)) {
10258 list_add_tail(&te->set->pending_update,
10261 nft_trans_destroy(trans);
10263 case NFT_MSG_DELSETELEM:
10264 case NFT_MSG_DESTROYSETELEM:
10265 te = (struct nft_trans_elem *)trans->data;
10267 nf_tables_setelem_notify(&trans->ctx, te->set,
10270 nft_setelem_remove(net, te->set, te->elem_priv);
10271 if (!nft_setelem_is_catchall(te->set, te->elem_priv)) {
10272 atomic_dec(&te->set->nelems);
10275 if (te->set->ops->commit &&
10276 list_empty(&te->set->pending_update)) {
10277 list_add_tail(&te->set->pending_update,
10281 case NFT_MSG_NEWOBJ:
10282 if (nft_trans_obj_update(trans)) {
10283 nft_obj_commit_update(trans);
10284 nf_tables_obj_notify(&trans->ctx,
10285 nft_trans_obj(trans),
10288 nft_clear(net, nft_trans_obj(trans));
10289 nf_tables_obj_notify(&trans->ctx,
10290 nft_trans_obj(trans),
10292 nft_trans_destroy(trans);
10295 case NFT_MSG_DELOBJ:
10296 case NFT_MSG_DESTROYOBJ:
10297 nft_obj_del(nft_trans_obj(trans));
10298 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
10301 case NFT_MSG_NEWFLOWTABLE:
10302 if (nft_trans_flowtable_update(trans)) {
10303 nft_trans_flowtable(trans)->data.flags =
10304 nft_trans_flowtable_flags(trans);
10305 nf_tables_flowtable_notify(&trans->ctx,
10306 nft_trans_flowtable(trans),
10307 &nft_trans_flowtable_hooks(trans),
10308 NFT_MSG_NEWFLOWTABLE);
10309 list_splice(&nft_trans_flowtable_hooks(trans),
10310 &nft_trans_flowtable(trans)->hook_list);
10312 nft_clear(net, nft_trans_flowtable(trans));
10313 nf_tables_flowtable_notify(&trans->ctx,
10314 nft_trans_flowtable(trans),
10316 NFT_MSG_NEWFLOWTABLE);
10318 nft_trans_destroy(trans);
10320 case NFT_MSG_DELFLOWTABLE:
10321 case NFT_MSG_DESTROYFLOWTABLE:
10322 if (nft_trans_flowtable_update(trans)) {
10323 nf_tables_flowtable_notify(&trans->ctx,
10324 nft_trans_flowtable(trans),
10325 &nft_trans_flowtable_hooks(trans),
10327 nft_unregister_flowtable_net_hooks(net,
10328 &nft_trans_flowtable_hooks(trans));
10330 list_del_rcu(&nft_trans_flowtable(trans)->list);
10331 nf_tables_flowtable_notify(&trans->ctx,
10332 nft_trans_flowtable(trans),
10335 nft_unregister_flowtable_net_hooks(net,
10336 &nft_trans_flowtable(trans)->hook_list);
10342 nft_set_commit_update(&set_update_list);
10344 nft_commit_notify(net, NETLINK_CB(skb).portid);
10345 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
10346 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
10348 nft_gc_seq_end(nft_net, gc_seq);
10349 nft_net->validate_state = NFT_VALIDATE_SKIP;
10350 nf_tables_commit_release(net);
10355 static void nf_tables_module_autoload(struct net *net)
10357 struct nftables_pernet *nft_net = nft_pernet(net);
10358 struct nft_module_request *req, *next;
10359 LIST_HEAD(module_list);
10361 list_splice_init(&nft_net->module_list, &module_list);
10362 mutex_unlock(&nft_net->commit_mutex);
10363 list_for_each_entry_safe(req, next, &module_list, list) {
10364 request_module("%s", req->module);
10367 mutex_lock(&nft_net->commit_mutex);
10368 list_splice(&module_list, &nft_net->module_list);
10371 static void nf_tables_abort_release(struct nft_trans *trans)
10373 switch (trans->msg_type) {
10374 case NFT_MSG_NEWTABLE:
10375 nf_tables_table_destroy(&trans->ctx);
10377 case NFT_MSG_NEWCHAIN:
10378 if (nft_trans_chain_update(trans))
10379 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
10381 nf_tables_chain_destroy(&trans->ctx);
10383 case NFT_MSG_NEWRULE:
10384 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
10386 case NFT_MSG_NEWSET:
10387 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
10389 case NFT_MSG_NEWSETELEM:
10390 nft_set_elem_destroy(nft_trans_elem_set(trans),
10391 nft_trans_elem_priv(trans), true);
10393 case NFT_MSG_NEWOBJ:
10394 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
10396 case NFT_MSG_NEWFLOWTABLE:
10397 if (nft_trans_flowtable_update(trans))
10398 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
10400 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
10406 static void nft_set_abort_update(struct list_head *set_update_list)
10408 struct nft_set *set, *next;
10410 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10411 list_del_init(&set->pending_update);
10413 if (!set->ops->abort)
10416 set->ops->abort(set);
10420 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
10422 struct nftables_pernet *nft_net = nft_pernet(net);
10423 struct nft_trans *trans, *next;
10424 LIST_HEAD(set_update_list);
10425 struct nft_trans_elem *te;
10427 if (action == NFNL_ABORT_VALIDATE &&
10428 nf_tables_validate(net) < 0)
10431 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
10433 switch (trans->msg_type) {
10434 case NFT_MSG_NEWTABLE:
10435 if (nft_trans_table_update(trans)) {
10436 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10437 nft_trans_destroy(trans);
10440 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
10441 nf_tables_table_disable(net, trans->ctx.table);
10442 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
10443 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
10444 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
10446 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_ORPHAN) {
10447 trans->ctx.table->flags &= ~NFT_TABLE_F_OWNER;
10448 trans->ctx.table->nlpid = 0;
10450 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10451 nft_trans_destroy(trans);
10453 list_del_rcu(&trans->ctx.table->list);
10456 case NFT_MSG_DELTABLE:
10457 case NFT_MSG_DESTROYTABLE:
10458 nft_clear(trans->ctx.net, trans->ctx.table);
10459 nft_trans_destroy(trans);
10461 case NFT_MSG_NEWCHAIN:
10462 if (nft_trans_chain_update(trans)) {
10463 nft_netdev_unregister_hooks(net,
10464 &nft_trans_chain_hooks(trans),
10466 free_percpu(nft_trans_chain_stats(trans));
10467 kfree(nft_trans_chain_name(trans));
10468 nft_trans_destroy(trans);
10470 if (nft_trans_chain_bound(trans)) {
10471 nft_trans_destroy(trans);
10474 nft_use_dec_restore(&trans->ctx.table->use);
10475 nft_chain_del(trans->ctx.chain);
10476 nf_tables_unregister_hook(trans->ctx.net,
10481 case NFT_MSG_DELCHAIN:
10482 case NFT_MSG_DESTROYCHAIN:
10483 if (nft_trans_chain_update(trans)) {
10484 list_splice(&nft_trans_chain_hooks(trans),
10485 &nft_trans_basechain(trans)->hook_list);
10487 nft_use_inc_restore(&trans->ctx.table->use);
10488 nft_clear(trans->ctx.net, trans->ctx.chain);
10490 nft_trans_destroy(trans);
10492 case NFT_MSG_NEWRULE:
10493 if (nft_trans_rule_bound(trans)) {
10494 nft_trans_destroy(trans);
10497 nft_use_dec_restore(&trans->ctx.chain->use);
10498 list_del_rcu(&nft_trans_rule(trans)->list);
10499 nft_rule_expr_deactivate(&trans->ctx,
10500 nft_trans_rule(trans),
10502 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10503 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10505 case NFT_MSG_DELRULE:
10506 case NFT_MSG_DESTROYRULE:
10507 nft_use_inc_restore(&trans->ctx.chain->use);
10508 nft_clear(trans->ctx.net, nft_trans_rule(trans));
10509 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10510 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10511 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10513 nft_trans_destroy(trans);
10515 case NFT_MSG_NEWSET:
10516 if (nft_trans_set_update(trans)) {
10517 nft_trans_destroy(trans);
10520 nft_use_dec_restore(&trans->ctx.table->use);
10521 if (nft_trans_set_bound(trans)) {
10522 nft_trans_destroy(trans);
10525 nft_trans_set(trans)->dead = 1;
10526 list_del_rcu(&nft_trans_set(trans)->list);
10528 case NFT_MSG_DELSET:
10529 case NFT_MSG_DESTROYSET:
10530 nft_use_inc_restore(&trans->ctx.table->use);
10531 nft_clear(trans->ctx.net, nft_trans_set(trans));
10532 if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10533 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10535 nft_trans_destroy(trans);
10537 case NFT_MSG_NEWSETELEM:
10538 if (nft_trans_elem_set_bound(trans)) {
10539 nft_trans_destroy(trans);
10542 te = (struct nft_trans_elem *)trans->data;
10543 nft_setelem_remove(net, te->set, te->elem_priv);
10544 if (!nft_setelem_is_catchall(te->set, te->elem_priv))
10545 atomic_dec(&te->set->nelems);
10547 if (te->set->ops->abort &&
10548 list_empty(&te->set->pending_update)) {
10549 list_add_tail(&te->set->pending_update,
10553 case NFT_MSG_DELSETELEM:
10554 case NFT_MSG_DESTROYSETELEM:
10555 te = (struct nft_trans_elem *)trans->data;
10557 nft_setelem_data_activate(net, te->set, te->elem_priv);
10558 nft_setelem_activate(net, te->set, te->elem_priv);
10559 if (!nft_setelem_is_catchall(te->set, te->elem_priv))
10562 if (te->set->ops->abort &&
10563 list_empty(&te->set->pending_update)) {
10564 list_add_tail(&te->set->pending_update,
10567 nft_trans_destroy(trans);
10569 case NFT_MSG_NEWOBJ:
10570 if (nft_trans_obj_update(trans)) {
10571 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10572 nft_trans_destroy(trans);
10574 nft_use_dec_restore(&trans->ctx.table->use);
10575 nft_obj_del(nft_trans_obj(trans));
10578 case NFT_MSG_DELOBJ:
10579 case NFT_MSG_DESTROYOBJ:
10580 nft_use_inc_restore(&trans->ctx.table->use);
10581 nft_clear(trans->ctx.net, nft_trans_obj(trans));
10582 nft_trans_destroy(trans);
10584 case NFT_MSG_NEWFLOWTABLE:
10585 if (nft_trans_flowtable_update(trans)) {
10586 nft_unregister_flowtable_net_hooks(net,
10587 &nft_trans_flowtable_hooks(trans));
10589 nft_use_dec_restore(&trans->ctx.table->use);
10590 list_del_rcu(&nft_trans_flowtable(trans)->list);
10591 nft_unregister_flowtable_net_hooks(net,
10592 &nft_trans_flowtable(trans)->hook_list);
10595 case NFT_MSG_DELFLOWTABLE:
10596 case NFT_MSG_DESTROYFLOWTABLE:
10597 if (nft_trans_flowtable_update(trans)) {
10598 list_splice(&nft_trans_flowtable_hooks(trans),
10599 &nft_trans_flowtable(trans)->hook_list);
10601 nft_use_inc_restore(&trans->ctx.table->use);
10602 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10604 nft_trans_destroy(trans);
10609 nft_set_abort_update(&set_update_list);
10613 list_for_each_entry_safe_reverse(trans, next,
10614 &nft_net->commit_list, list) {
10615 nft_trans_list_del(trans);
10616 nf_tables_abort_release(trans);
10619 if (action == NFNL_ABORT_AUTOLOAD)
10620 nf_tables_module_autoload(net);
10622 nf_tables_module_autoload_cleanup(net);
10627 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10628 enum nfnl_abort_action action)
10630 struct nftables_pernet *nft_net = nft_pernet(net);
10631 unsigned int gc_seq;
10634 gc_seq = nft_gc_seq_begin(nft_net);
10635 ret = __nf_tables_abort(net, action);
10636 nft_gc_seq_end(nft_net, gc_seq);
10637 mutex_unlock(&nft_net->commit_mutex);
10642 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10644 struct nftables_pernet *nft_net = nft_pernet(net);
10647 mutex_lock(&nft_net->commit_mutex);
10648 nft_net->tstamp = get_jiffies_64();
10650 genid_ok = genid == 0 || nft_net->base_seq == genid;
10652 mutex_unlock(&nft_net->commit_mutex);
10654 /* else, commit mutex has to be released by commit or abort function */
10658 static const struct nfnetlink_subsystem nf_tables_subsys = {
10659 .name = "nf_tables",
10660 .subsys_id = NFNL_SUBSYS_NFTABLES,
10661 .cb_count = NFT_MSG_MAX,
10662 .cb = nf_tables_cb,
10663 .commit = nf_tables_commit,
10664 .abort = nf_tables_abort,
10665 .valid_genid = nf_tables_valid_genid,
10666 .owner = THIS_MODULE,
10669 int nft_chain_validate_dependency(const struct nft_chain *chain,
10670 enum nft_chain_types type)
10672 const struct nft_base_chain *basechain;
10674 if (nft_is_base_chain(chain)) {
10675 basechain = nft_base_chain(chain);
10676 if (basechain->type->type != type)
10677 return -EOPNOTSUPP;
10681 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10683 int nft_chain_validate_hooks(const struct nft_chain *chain,
10684 unsigned int hook_flags)
10686 struct nft_base_chain *basechain;
10688 if (nft_is_base_chain(chain)) {
10689 basechain = nft_base_chain(chain);
10691 if ((1 << basechain->ops.hooknum) & hook_flags)
10694 return -EOPNOTSUPP;
10699 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10702 * Loop detection - walk through the ruleset beginning at the destination chain
10703 * of a new jump until either the source chain is reached (loop) or all
10704 * reachable chains have been traversed.
10706 * The loop check is performed whenever a new jump verdict is added to an
10707 * expression or verdict map or a verdict map is bound to a new chain.
10710 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10711 const struct nft_chain *chain);
10713 static int nft_check_loops(const struct nft_ctx *ctx,
10714 const struct nft_set_ext *ext)
10716 const struct nft_data *data;
10719 data = nft_set_ext_data(ext);
10720 switch (data->verdict.code) {
10723 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10733 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10734 struct nft_set *set,
10735 const struct nft_set_iter *iter,
10736 struct nft_elem_priv *elem_priv)
10738 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
10740 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10741 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10744 return nft_check_loops(ctx, ext);
10747 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10748 struct nft_set *set)
10750 u8 genmask = nft_genmask_next(ctx->net);
10751 struct nft_set_elem_catchall *catchall;
10752 struct nft_set_ext *ext;
10755 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10756 ext = nft_set_elem_ext(set, catchall->elem);
10757 if (!nft_set_elem_active(ext, genmask))
10760 ret = nft_check_loops(ctx, ext);
10768 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10769 const struct nft_chain *chain)
10771 const struct nft_rule *rule;
10772 const struct nft_expr *expr, *last;
10773 struct nft_set *set;
10774 struct nft_set_binding *binding;
10775 struct nft_set_iter iter;
10777 if (ctx->chain == chain)
10780 if (fatal_signal_pending(current))
10783 list_for_each_entry(rule, &chain->rules, list) {
10784 nft_rule_for_each_expr(expr, last, rule) {
10785 struct nft_immediate_expr *priv;
10786 const struct nft_data *data;
10789 if (strcmp(expr->ops->type->name, "immediate"))
10792 priv = nft_expr_priv(expr);
10793 if (priv->dreg != NFT_REG_VERDICT)
10796 data = &priv->data;
10797 switch (data->verdict.code) {
10800 err = nf_tables_check_loops(ctx,
10801 data->verdict.chain);
10811 list_for_each_entry(set, &ctx->table->sets, list) {
10812 if (!nft_is_active_next(ctx->net, set))
10814 if (!(set->flags & NFT_SET_MAP) ||
10815 set->dtype != NFT_DATA_VERDICT)
10818 list_for_each_entry(binding, &set->bindings, list) {
10819 if (!(binding->flags & NFT_SET_MAP) ||
10820 binding->chain != chain)
10823 iter.genmask = nft_genmask_next(ctx->net);
10827 iter.fn = nf_tables_loop_check_setelem;
10829 set->ops->walk(ctx, set, &iter);
10831 iter.err = nft_set_catchall_loops(ctx, set);
10842 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
10844 * @attr: netlink attribute to fetch value from
10845 * @max: maximum value to be stored in dest
10846 * @dest: pointer to the variable
10848 * Parse, check and store a given u32 netlink attribute into variable.
10849 * This function returns -ERANGE if the value goes over maximum value.
10850 * Otherwise a 0 is returned and the attribute value is stored in the
10851 * destination variable.
10853 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10857 val = ntohl(nla_get_be32(attr));
10864 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10866 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10870 reg = ntohl(nla_get_be32(attr));
10872 case NFT_REG_VERDICT...NFT_REG_4:
10873 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10875 case NFT_REG32_00...NFT_REG32_15:
10876 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10886 * nft_dump_register - dump a register value to a netlink attribute
10888 * @skb: socket buffer
10889 * @attr: attribute number
10890 * @reg: register number
10892 * Construct a netlink attribute containing the register number. For
10893 * compatibility reasons, register numbers being a multiple of 4 are
10894 * translated to the corresponding 128 bit register numbers.
10896 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10898 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10899 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10901 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10903 return nla_put_be32(skb, attr, htonl(reg));
10905 EXPORT_SYMBOL_GPL(nft_dump_register);
10907 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10909 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10913 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10919 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10924 err = nft_parse_register(attr, ®);
10928 err = nft_validate_register_load(reg, len);
10935 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10937 static int nft_validate_register_store(const struct nft_ctx *ctx,
10938 enum nft_registers reg,
10939 const struct nft_data *data,
10940 enum nft_data_types type,
10946 case NFT_REG_VERDICT:
10947 if (type != NFT_DATA_VERDICT)
10950 if (data != NULL &&
10951 (data->verdict.code == NFT_GOTO ||
10952 data->verdict.code == NFT_JUMP)) {
10953 err = nf_tables_check_loops(ctx, data->verdict.chain);
10960 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10964 if (reg * NFT_REG32_SIZE + len >
10965 sizeof_field(struct nft_regs, data))
10968 if (data != NULL && type != NFT_DATA_VALUE)
10974 int nft_parse_register_store(const struct nft_ctx *ctx,
10975 const struct nlattr *attr, u8 *dreg,
10976 const struct nft_data *data,
10977 enum nft_data_types type, unsigned int len)
10982 err = nft_parse_register(attr, ®);
10986 err = nft_validate_register_store(ctx, reg, data, type, len);
10993 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10995 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10996 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
10997 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
10998 .len = NFT_CHAIN_MAXNAMELEN - 1 },
10999 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
11002 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
11003 struct nft_data_desc *desc, const struct nlattr *nla)
11005 u8 genmask = nft_genmask_next(ctx->net);
11006 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
11007 struct nft_chain *chain;
11010 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
11011 nft_verdict_policy, NULL);
11015 if (!tb[NFTA_VERDICT_CODE])
11018 /* zero padding hole for memcmp */
11019 memset(data, 0, sizeof(*data));
11020 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
11022 switch (data->verdict.code) {
11033 if (tb[NFTA_VERDICT_CHAIN]) {
11034 chain = nft_chain_lookup(ctx->net, ctx->table,
11035 tb[NFTA_VERDICT_CHAIN],
11037 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
11038 chain = nft_chain_lookup_byid(ctx->net, ctx->table,
11039 tb[NFTA_VERDICT_CHAIN_ID],
11042 return PTR_ERR(chain);
11048 return PTR_ERR(chain);
11049 if (nft_is_base_chain(chain))
11050 return -EOPNOTSUPP;
11051 if (nft_chain_is_bound(chain))
11053 if (desc->flags & NFT_DATA_DESC_SETELEM &&
11054 chain->flags & NFT_CHAIN_BINDING)
11056 if (!nft_use_inc(&chain->use))
11059 data->verdict.chain = chain;
11065 desc->len = sizeof(data->verdict);
11070 static void nft_verdict_uninit(const struct nft_data *data)
11072 struct nft_chain *chain;
11074 switch (data->verdict.code) {
11077 chain = data->verdict.chain;
11078 nft_use_dec(&chain->use);
11083 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
11085 struct nlattr *nest;
11087 nest = nla_nest_start_noflag(skb, type);
11089 goto nla_put_failure;
11091 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
11092 goto nla_put_failure;
11097 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
11099 goto nla_put_failure;
11101 nla_nest_end(skb, nest);
11108 static int nft_value_init(const struct nft_ctx *ctx,
11109 struct nft_data *data, struct nft_data_desc *desc,
11110 const struct nlattr *nla)
11114 len = nla_len(nla);
11117 if (len > desc->size)
11120 if (len != desc->len)
11126 nla_memcpy(data->data, nla, len);
11131 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
11134 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
11137 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
11138 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
11139 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
11143 * nft_data_init - parse nf_tables data netlink attributes
11145 * @ctx: context of the expression using the data
11146 * @data: destination struct nft_data
11147 * @desc: data description
11148 * @nla: netlink attribute containing data
11150 * Parse the netlink data attributes and initialize a struct nft_data.
11151 * The type and length of data are returned in the data description.
11153 * The caller can indicate that it only wants to accept data of type
11154 * NFT_DATA_VALUE by passing NULL for the ctx argument.
11156 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
11157 struct nft_data_desc *desc, const struct nlattr *nla)
11159 struct nlattr *tb[NFTA_DATA_MAX + 1];
11162 if (WARN_ON_ONCE(!desc->size))
11165 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
11166 nft_data_policy, NULL);
11170 if (tb[NFTA_DATA_VALUE]) {
11171 if (desc->type != NFT_DATA_VALUE)
11174 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
11175 } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
11176 if (desc->type != NFT_DATA_VERDICT)
11179 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
11186 EXPORT_SYMBOL_GPL(nft_data_init);
11189 * nft_data_release - release a nft_data item
11191 * @data: struct nft_data to release
11192 * @type: type of data
11194 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
11195 * all others need to be released by calling this function.
11197 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
11199 if (type < NFT_DATA_VERDICT)
11202 case NFT_DATA_VERDICT:
11203 return nft_verdict_uninit(data);
11208 EXPORT_SYMBOL_GPL(nft_data_release);
11210 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
11211 enum nft_data_types type, unsigned int len)
11213 struct nlattr *nest;
11216 nest = nla_nest_start_noflag(skb, attr);
11221 case NFT_DATA_VALUE:
11222 err = nft_value_dump(skb, data, len);
11224 case NFT_DATA_VERDICT:
11225 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
11232 nla_nest_end(skb, nest);
11235 EXPORT_SYMBOL_GPL(nft_data_dump);
11237 int __nft_release_basechain(struct nft_ctx *ctx)
11239 struct nft_rule *rule, *nr;
11241 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
11244 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
11245 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
11246 list_del(&rule->list);
11247 nft_use_dec(&ctx->chain->use);
11248 nf_tables_rule_release(ctx, rule);
11250 nft_chain_del(ctx->chain);
11251 nft_use_dec(&ctx->table->use);
11252 nf_tables_chain_destroy(ctx);
11256 EXPORT_SYMBOL_GPL(__nft_release_basechain);
11258 static void __nft_release_hook(struct net *net, struct nft_table *table)
11260 struct nft_flowtable *flowtable;
11261 struct nft_chain *chain;
11263 list_for_each_entry(chain, &table->chains, list)
11264 __nf_tables_unregister_hook(net, table, chain, true);
11265 list_for_each_entry(flowtable, &table->flowtables, list)
11266 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
11270 static void __nft_release_hooks(struct net *net)
11272 struct nftables_pernet *nft_net = nft_pernet(net);
11273 struct nft_table *table;
11275 list_for_each_entry(table, &nft_net->tables, list) {
11276 if (nft_table_has_owner(table))
11279 __nft_release_hook(net, table);
11283 static void __nft_release_table(struct net *net, struct nft_table *table)
11285 struct nft_flowtable *flowtable, *nf;
11286 struct nft_chain *chain, *nc;
11287 struct nft_object *obj, *ne;
11288 struct nft_rule *rule, *nr;
11289 struct nft_set *set, *ns;
11290 struct nft_ctx ctx = {
11292 .family = NFPROTO_NETDEV,
11295 ctx.family = table->family;
11297 list_for_each_entry(chain, &table->chains, list) {
11298 if (nft_chain_binding(chain))
11302 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
11303 list_del(&rule->list);
11304 nft_use_dec(&chain->use);
11305 nf_tables_rule_release(&ctx, rule);
11308 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
11309 list_del(&flowtable->list);
11310 nft_use_dec(&table->use);
11311 nf_tables_flowtable_destroy(flowtable);
11313 list_for_each_entry_safe(set, ns, &table->sets, list) {
11314 list_del(&set->list);
11315 nft_use_dec(&table->use);
11316 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
11317 nft_map_deactivate(&ctx, set);
11319 nft_set_destroy(&ctx, set);
11321 list_for_each_entry_safe(obj, ne, &table->objects, list) {
11323 nft_use_dec(&table->use);
11324 nft_obj_destroy(&ctx, obj);
11326 list_for_each_entry_safe(chain, nc, &table->chains, list) {
11328 nft_chain_del(chain);
11329 nft_use_dec(&table->use);
11330 nf_tables_chain_destroy(&ctx);
11332 nf_tables_table_destroy(&ctx);
11335 static void __nft_release_tables(struct net *net)
11337 struct nftables_pernet *nft_net = nft_pernet(net);
11338 struct nft_table *table, *nt;
11340 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
11341 if (nft_table_has_owner(table))
11344 list_del(&table->list);
11346 __nft_release_table(net, table);
11350 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
11353 struct nft_table *table, *to_delete[8];
11354 struct nftables_pernet *nft_net;
11355 struct netlink_notify *n = ptr;
11356 struct net *net = n->net;
11357 unsigned int deleted;
11358 bool restart = false;
11359 unsigned int gc_seq;
11361 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
11362 return NOTIFY_DONE;
11364 nft_net = nft_pernet(net);
11366 mutex_lock(&nft_net->commit_mutex);
11368 gc_seq = nft_gc_seq_begin(nft_net);
11370 if (!list_empty(&nf_tables_destroy_list))
11371 nf_tables_trans_destroy_flush_work();
11373 list_for_each_entry(table, &nft_net->tables, list) {
11374 if (nft_table_has_owner(table) &&
11375 n->portid == table->nlpid) {
11376 if (table->flags & NFT_TABLE_F_PERSIST) {
11377 table->flags &= ~NFT_TABLE_F_OWNER;
11380 __nft_release_hook(net, table);
11381 list_del_rcu(&table->list);
11382 to_delete[deleted++] = table;
11383 if (deleted >= ARRAY_SIZE(to_delete))
11388 restart = deleted >= ARRAY_SIZE(to_delete);
11391 __nft_release_table(net, to_delete[--deleted]);
11396 nft_gc_seq_end(nft_net, gc_seq);
11398 mutex_unlock(&nft_net->commit_mutex);
11400 return NOTIFY_DONE;
11403 static struct notifier_block nft_nl_notifier = {
11404 .notifier_call = nft_rcv_nl_event,
11407 static int __net_init nf_tables_init_net(struct net *net)
11409 struct nftables_pernet *nft_net = nft_pernet(net);
11411 INIT_LIST_HEAD(&nft_net->tables);
11412 INIT_LIST_HEAD(&nft_net->commit_list);
11413 INIT_LIST_HEAD(&nft_net->binding_list);
11414 INIT_LIST_HEAD(&nft_net->module_list);
11415 INIT_LIST_HEAD(&nft_net->notify_list);
11416 mutex_init(&nft_net->commit_mutex);
11417 nft_net->base_seq = 1;
11418 nft_net->gc_seq = 0;
11419 nft_net->validate_state = NFT_VALIDATE_SKIP;
11424 static void __net_exit nf_tables_pre_exit_net(struct net *net)
11426 struct nftables_pernet *nft_net = nft_pernet(net);
11428 mutex_lock(&nft_net->commit_mutex);
11429 __nft_release_hooks(net);
11430 mutex_unlock(&nft_net->commit_mutex);
11433 static void __net_exit nf_tables_exit_net(struct net *net)
11435 struct nftables_pernet *nft_net = nft_pernet(net);
11436 unsigned int gc_seq;
11438 mutex_lock(&nft_net->commit_mutex);
11440 gc_seq = nft_gc_seq_begin(nft_net);
11442 if (!list_empty(&nft_net->commit_list) ||
11443 !list_empty(&nft_net->module_list))
11444 __nf_tables_abort(net, NFNL_ABORT_NONE);
11446 __nft_release_tables(net);
11448 nft_gc_seq_end(nft_net, gc_seq);
11450 mutex_unlock(&nft_net->commit_mutex);
11451 WARN_ON_ONCE(!list_empty(&nft_net->tables));
11452 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
11453 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
11456 static void nf_tables_exit_batch(struct list_head *net_exit_list)
11458 flush_work(&trans_gc_work);
11461 static struct pernet_operations nf_tables_net_ops = {
11462 .init = nf_tables_init_net,
11463 .pre_exit = nf_tables_pre_exit_net,
11464 .exit = nf_tables_exit_net,
11465 .exit_batch = nf_tables_exit_batch,
11466 .id = &nf_tables_net_id,
11467 .size = sizeof(struct nftables_pernet),
11470 static int __init nf_tables_module_init(void)
11474 err = register_pernet_subsys(&nf_tables_net_ops);
11478 err = nft_chain_filter_init();
11480 goto err_chain_filter;
11482 err = nf_tables_core_module_init();
11484 goto err_core_module;
11486 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
11488 goto err_netdev_notifier;
11490 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
11492 goto err_rht_objname;
11494 err = nft_offload_init();
11498 err = netlink_register_notifier(&nft_nl_notifier);
11500 goto err_netlink_notifier;
11503 err = nfnetlink_subsys_register(&nf_tables_subsys);
11505 goto err_nfnl_subsys;
11507 nft_chain_route_init();
11512 netlink_unregister_notifier(&nft_nl_notifier);
11513 err_netlink_notifier:
11514 nft_offload_exit();
11516 rhltable_destroy(&nft_objname_ht);
11518 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11519 err_netdev_notifier:
11520 nf_tables_core_module_exit();
11522 nft_chain_filter_fini();
11524 unregister_pernet_subsys(&nf_tables_net_ops);
11528 static void __exit nf_tables_module_exit(void)
11530 nfnetlink_subsys_unregister(&nf_tables_subsys);
11531 netlink_unregister_notifier(&nft_nl_notifier);
11532 nft_offload_exit();
11533 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11534 nft_chain_filter_fini();
11535 nft_chain_route_fini();
11536 unregister_pernet_subsys(&nf_tables_net_ops);
11537 cancel_work_sync(&trans_gc_work);
11538 cancel_work_sync(&trans_destroy_work);
11540 rhltable_destroy(&nft_objname_ht);
11541 nf_tables_core_module_exit();
11544 module_init(nf_tables_module_init);
11545 module_exit(nf_tables_module_exit);
11547 MODULE_LICENSE("GPL");
11548 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11549 MODULE_DESCRIPTION("Framework for packet filtering and classification");
11550 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);