1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
5 * Development of this code funded by Astaro AG (http://www.astaro.com/)
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/list.h>
11 #include <linux/skbuff.h>
12 #include <linux/netlink.h>
13 #include <linux/vmalloc.h>
14 #include <linux/rhashtable.h>
15 #include <linux/audit.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_flow_table.h>
20 #include <net/netfilter/nf_tables_core.h>
21 #include <net/netfilter/nf_tables.h>
22 #include <net/netfilter/nf_tables_offload.h>
23 #include <net/net_namespace.h>
26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
28 unsigned int nf_tables_net_id __read_mostly;
30 static LIST_HEAD(nf_tables_expressions);
31 static LIST_HEAD(nf_tables_objects);
32 static LIST_HEAD(nf_tables_flowtables);
33 static LIST_HEAD(nf_tables_destroy_list);
34 static LIST_HEAD(nf_tables_gc_list);
35 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
36 static DEFINE_SPINLOCK(nf_tables_gc_list_lock);
39 NFT_VALIDATE_SKIP = 0,
44 static struct rhltable nft_objname_ht;
46 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
47 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
48 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
50 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
51 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
52 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
54 static const struct rhashtable_params nft_chain_ht_params = {
55 .head_offset = offsetof(struct nft_chain, rhlhead),
56 .key_offset = offsetof(struct nft_chain, name),
57 .hashfn = nft_chain_hash,
58 .obj_hashfn = nft_chain_hash_obj,
59 .obj_cmpfn = nft_chain_hash_cmp,
60 .automatic_shrinking = true,
63 static const struct rhashtable_params nft_objname_ht_params = {
64 .head_offset = offsetof(struct nft_object, rhlhead),
65 .key_offset = offsetof(struct nft_object, key),
66 .hashfn = nft_objname_hash,
67 .obj_hashfn = nft_objname_hash_obj,
68 .obj_cmpfn = nft_objname_hash_cmp,
69 .automatic_shrinking = true,
72 struct nft_audit_data {
73 struct nft_table *table;
76 struct list_head list;
79 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
80 [NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER,
81 [NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID,
82 [NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER,
83 [NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER,
84 [NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID,
85 [NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER,
86 [NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER,
87 [NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID,
88 [NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER,
89 [NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER,
90 [NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID,
91 [NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER,
92 [NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER,
93 [NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID,
94 [NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER,
95 [NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER,
96 [NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID,
97 [NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID,
98 [NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER,
99 [NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID,
100 [NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER,
101 [NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET,
102 [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
103 [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
104 [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
105 [NFT_MSG_GETSETELEM_RESET] = AUDIT_NFT_OP_SETELEM_RESET,
108 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
110 switch (table->validate_state) {
111 case NFT_VALIDATE_SKIP:
112 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
114 case NFT_VALIDATE_NEED:
116 case NFT_VALIDATE_DO:
117 if (new_validate_state == NFT_VALIDATE_NEED)
121 table->validate_state = new_validate_state;
123 static void nf_tables_trans_destroy_work(struct work_struct *w);
124 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
126 static void nft_trans_gc_work(struct work_struct *work);
127 static DECLARE_WORK(trans_gc_work, nft_trans_gc_work);
129 static void nft_ctx_init(struct nft_ctx *ctx,
131 const struct sk_buff *skb,
132 const struct nlmsghdr *nlh,
134 struct nft_table *table,
135 struct nft_chain *chain,
136 const struct nlattr * const *nla)
139 ctx->family = family;
144 ctx->portid = NETLINK_CB(skb).portid;
145 ctx->report = nlmsg_report(nlh);
146 ctx->flags = nlh->nlmsg_flags;
147 ctx->seq = nlh->nlmsg_seq;
150 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
151 int msg_type, u32 size, gfp_t gfp)
153 struct nft_trans *trans;
155 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
159 INIT_LIST_HEAD(&trans->list);
160 INIT_LIST_HEAD(&trans->binding_list);
161 trans->msg_type = msg_type;
167 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
168 int msg_type, u32 size)
170 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
173 static void nft_trans_list_del(struct nft_trans *trans)
175 list_del(&trans->list);
176 list_del(&trans->binding_list);
179 static void nft_trans_destroy(struct nft_trans *trans)
181 nft_trans_list_del(trans);
185 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
188 struct nftables_pernet *nft_net;
189 struct net *net = ctx->net;
190 struct nft_trans *trans;
192 if (!nft_set_is_anonymous(set))
195 nft_net = nft_pernet(net);
196 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
197 switch (trans->msg_type) {
199 if (nft_trans_set(trans) == set)
200 nft_trans_set_bound(trans) = bind;
202 case NFT_MSG_NEWSETELEM:
203 if (nft_trans_elem_set(trans) == set)
204 nft_trans_elem_set_bound(trans) = bind;
210 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
212 return __nft_set_trans_bind(ctx, set, true);
215 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
217 return __nft_set_trans_bind(ctx, set, false);
220 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
221 struct nft_chain *chain, bool bind)
223 struct nftables_pernet *nft_net;
224 struct net *net = ctx->net;
225 struct nft_trans *trans;
227 if (!nft_chain_binding(chain))
230 nft_net = nft_pernet(net);
231 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
232 switch (trans->msg_type) {
233 case NFT_MSG_NEWCHAIN:
234 if (nft_trans_chain(trans) == chain)
235 nft_trans_chain_bound(trans) = bind;
237 case NFT_MSG_NEWRULE:
238 if (trans->ctx.chain == chain)
239 nft_trans_rule_bound(trans) = bind;
245 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
246 struct nft_chain *chain)
248 __nft_chain_trans_bind(ctx, chain, true);
251 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
253 if (!nft_chain_binding(chain))
256 if (nft_chain_binding(ctx->chain))
262 if (!nft_use_inc(&chain->use))
266 nft_chain_trans_bind(ctx, chain);
271 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
273 __nft_chain_trans_bind(ctx, chain, false);
276 static int nft_netdev_register_hooks(struct net *net,
277 struct list_head *hook_list)
279 struct nft_hook *hook;
283 list_for_each_entry(hook, hook_list, list) {
284 err = nf_register_net_hook(net, &hook->ops);
293 list_for_each_entry(hook, hook_list, list) {
297 nf_unregister_net_hook(net, &hook->ops);
302 static void nft_netdev_unregister_hooks(struct net *net,
303 struct list_head *hook_list,
306 struct nft_hook *hook, *next;
308 list_for_each_entry_safe(hook, next, hook_list, list) {
309 nf_unregister_net_hook(net, &hook->ops);
310 if (release_netdev) {
311 list_del(&hook->list);
312 kfree_rcu(hook, rcu);
317 static int nf_tables_register_hook(struct net *net,
318 const struct nft_table *table,
319 struct nft_chain *chain)
321 struct nft_base_chain *basechain;
322 const struct nf_hook_ops *ops;
324 if (table->flags & NFT_TABLE_F_DORMANT ||
325 !nft_is_base_chain(chain))
328 basechain = nft_base_chain(chain);
329 ops = &basechain->ops;
331 if (basechain->type->ops_register)
332 return basechain->type->ops_register(net, ops);
334 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
335 return nft_netdev_register_hooks(net, &basechain->hook_list);
337 return nf_register_net_hook(net, &basechain->ops);
340 static void __nf_tables_unregister_hook(struct net *net,
341 const struct nft_table *table,
342 struct nft_chain *chain,
345 struct nft_base_chain *basechain;
346 const struct nf_hook_ops *ops;
348 if (table->flags & NFT_TABLE_F_DORMANT ||
349 !nft_is_base_chain(chain))
351 basechain = nft_base_chain(chain);
352 ops = &basechain->ops;
354 if (basechain->type->ops_unregister)
355 return basechain->type->ops_unregister(net, ops);
357 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
358 nft_netdev_unregister_hooks(net, &basechain->hook_list,
361 nf_unregister_net_hook(net, &basechain->ops);
364 static void nf_tables_unregister_hook(struct net *net,
365 const struct nft_table *table,
366 struct nft_chain *chain)
368 return __nf_tables_unregister_hook(net, table, chain, false);
371 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
373 struct nftables_pernet *nft_net = nft_pernet(net);
375 switch (trans->msg_type) {
377 if (!nft_trans_set_update(trans) &&
378 nft_set_is_anonymous(nft_trans_set(trans)))
379 list_add_tail(&trans->binding_list, &nft_net->binding_list);
381 case NFT_MSG_NEWCHAIN:
382 if (!nft_trans_chain_update(trans) &&
383 nft_chain_binding(nft_trans_chain(trans)))
384 list_add_tail(&trans->binding_list, &nft_net->binding_list);
388 list_add_tail(&trans->list, &nft_net->commit_list);
391 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
393 struct nft_trans *trans;
395 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
399 if (msg_type == NFT_MSG_NEWTABLE)
400 nft_activate_next(ctx->net, ctx->table);
402 nft_trans_commit_list_add_tail(ctx->net, trans);
406 static int nft_deltable(struct nft_ctx *ctx)
410 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
414 nft_deactivate_next(ctx->net, ctx->table);
418 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
420 struct nft_trans *trans;
422 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
424 return ERR_PTR(-ENOMEM);
426 if (msg_type == NFT_MSG_NEWCHAIN) {
427 nft_activate_next(ctx->net, ctx->chain);
429 if (ctx->nla[NFTA_CHAIN_ID]) {
430 nft_trans_chain_id(trans) =
431 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
434 nft_trans_chain(trans) = ctx->chain;
435 nft_trans_commit_list_add_tail(ctx->net, trans);
440 static int nft_delchain(struct nft_ctx *ctx)
442 struct nft_trans *trans;
444 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
446 return PTR_ERR(trans);
448 nft_use_dec(&ctx->table->use);
449 nft_deactivate_next(ctx->net, ctx->chain);
454 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
456 struct nft_expr *expr;
458 expr = nft_expr_first(rule);
459 while (nft_expr_more(rule, expr)) {
460 if (expr->ops->activate)
461 expr->ops->activate(ctx, expr);
463 expr = nft_expr_next(expr);
467 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
468 enum nft_trans_phase phase)
470 struct nft_expr *expr;
472 expr = nft_expr_first(rule);
473 while (nft_expr_more(rule, expr)) {
474 if (expr->ops->deactivate)
475 expr->ops->deactivate(ctx, expr, phase);
477 expr = nft_expr_next(expr);
482 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
484 /* You cannot delete the same rule twice */
485 if (nft_is_active_next(ctx->net, rule)) {
486 nft_deactivate_next(ctx->net, rule);
487 nft_use_dec(&ctx->chain->use);
493 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
494 struct nft_rule *rule)
496 struct nft_trans *trans;
498 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
502 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
503 nft_trans_rule_id(trans) =
504 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
506 nft_trans_rule(trans) = rule;
507 nft_trans_commit_list_add_tail(ctx->net, trans);
512 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
514 struct nft_flow_rule *flow;
515 struct nft_trans *trans;
518 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
522 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
523 flow = nft_flow_rule_create(ctx->net, rule);
525 nft_trans_destroy(trans);
526 return PTR_ERR(flow);
529 nft_trans_flow_rule(trans) = flow;
532 err = nf_tables_delrule_deactivate(ctx, rule);
534 nft_trans_destroy(trans);
537 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
542 static int nft_delrule_by_chain(struct nft_ctx *ctx)
544 struct nft_rule *rule;
547 list_for_each_entry(rule, &ctx->chain->rules, list) {
548 if (!nft_is_active_next(ctx->net, rule))
551 err = nft_delrule(ctx, rule);
558 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
560 const struct nft_set_desc *desc)
562 struct nft_trans *trans;
564 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
568 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
569 nft_trans_set_id(trans) =
570 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
571 nft_activate_next(ctx->net, set);
573 nft_trans_set(trans) = set;
575 nft_trans_set_update(trans) = true;
576 nft_trans_set_gc_int(trans) = desc->gc_int;
577 nft_trans_set_timeout(trans) = desc->timeout;
578 nft_trans_set_size(trans) = desc->size;
580 nft_trans_commit_list_add_tail(ctx->net, trans);
585 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
588 return __nft_trans_set_add(ctx, msg_type, set, NULL);
591 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
593 const struct nft_set_iter *iter,
594 struct nft_set_elem *elem)
596 nft_setelem_data_deactivate(ctx->net, set, elem);
601 struct nft_set_elem_catchall {
602 struct list_head list;
607 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
610 u8 genmask = nft_genmask_next(ctx->net);
611 struct nft_set_elem_catchall *catchall;
612 struct nft_set_elem elem;
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 elem.priv = catchall->elem;
621 nft_setelem_data_deactivate(ctx->net, set, &elem);
626 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
628 struct nft_set_iter iter = {
629 .genmask = nft_genmask_next(ctx->net),
630 .fn = nft_mapelem_deactivate,
633 set->ops->walk(ctx, set, &iter);
634 WARN_ON_ONCE(iter.err);
636 nft_map_catchall_deactivate(ctx, set);
639 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
643 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
647 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
648 nft_map_deactivate(ctx, set);
650 nft_deactivate_next(ctx->net, set);
651 nft_use_dec(&ctx->table->use);
656 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
657 struct nft_object *obj)
659 struct nft_trans *trans;
661 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
665 if (msg_type == NFT_MSG_NEWOBJ)
666 nft_activate_next(ctx->net, obj);
668 nft_trans_obj(trans) = obj;
669 nft_trans_commit_list_add_tail(ctx->net, trans);
674 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
678 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
682 nft_deactivate_next(ctx->net, obj);
683 nft_use_dec(&ctx->table->use);
688 static int 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));
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)
713 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
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 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 nft_active_genmask(table, genmask)) {
817 if (nft_table_has_owner(table) &&
818 nlpid && table->nlpid != nlpid)
819 return ERR_PTR(-EPERM);
825 return ERR_PTR(-ENOENT);
828 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
830 return ++table->hgenerator;
833 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
835 static const struct nft_chain_type *
836 __nft_chain_type_get(u8 family, enum nft_chain_types type)
838 if (family >= NFPROTO_NUMPROTO ||
839 type >= NFT_CHAIN_T_MAX)
842 return chain_type[family][type];
845 static const struct nft_chain_type *
846 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
848 const struct nft_chain_type *type;
851 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
852 type = __nft_chain_type_get(family, i);
855 if (!nla_strcmp(nla, type->name))
861 struct nft_module_request {
862 struct list_head list;
863 char module[MODULE_NAME_LEN];
867 #ifdef CONFIG_MODULES
868 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
871 char module_name[MODULE_NAME_LEN];
872 struct nftables_pernet *nft_net;
873 struct nft_module_request *req;
878 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
880 if (ret >= MODULE_NAME_LEN)
883 nft_net = nft_pernet(net);
884 list_for_each_entry(req, &nft_net->module_list, list) {
885 if (!strcmp(req->module, module_name)) {
889 /* A request to load this module already exists. */
894 req = kmalloc(sizeof(*req), GFP_KERNEL);
899 strscpy(req->module, module_name, MODULE_NAME_LEN);
900 list_add_tail(&req->list, &nft_net->module_list);
904 EXPORT_SYMBOL_GPL(nft_request_module);
907 static void lockdep_nfnl_nft_mutex_not_held(void)
909 #ifdef CONFIG_PROVE_LOCKING
911 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
915 static const struct nft_chain_type *
916 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
917 u8 family, bool autoload)
919 const struct nft_chain_type *type;
921 type = __nf_tables_chain_type_lookup(nla, family);
925 lockdep_nfnl_nft_mutex_not_held();
926 #ifdef CONFIG_MODULES
928 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
930 (const char *)nla_data(nla)) == -EAGAIN)
931 return ERR_PTR(-EAGAIN);
934 return ERR_PTR(-ENOENT);
937 static __be16 nft_base_seq(const struct net *net)
939 struct nftables_pernet *nft_net = nft_pernet(net);
941 return htons(nft_net->base_seq & 0xffff);
944 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
945 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
946 .len = NFT_TABLE_MAXNAMELEN - 1 },
947 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
948 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
949 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
950 .len = NFT_USERDATA_MAXLEN }
953 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
954 u32 portid, u32 seq, int event, u32 flags,
955 int family, const struct nft_table *table)
957 struct nlmsghdr *nlh;
959 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
960 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
961 NFNETLINK_V0, nft_base_seq(net));
963 goto nla_put_failure;
965 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
966 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
967 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
969 goto nla_put_failure;
971 if (event == NFT_MSG_DELTABLE) {
976 if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
977 htonl(table->flags & NFT_TABLE_F_MASK)))
978 goto nla_put_failure;
980 if (nft_table_has_owner(table) &&
981 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
982 goto nla_put_failure;
985 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
986 goto nla_put_failure;
993 nlmsg_trim(skb, nlh);
997 struct nftnl_skb_parms {
1000 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
1002 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
1003 struct list_head *notify_list)
1005 NFT_CB(skb).report = report;
1006 list_add_tail(&skb->list, notify_list);
1009 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
1011 struct nftables_pernet *nft_net;
1012 struct sk_buff *skb;
1017 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1020 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1024 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1025 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1027 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
1028 event, flags, ctx->family, ctx->table);
1034 nft_net = nft_pernet(ctx->net);
1035 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1038 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1041 static int nf_tables_dump_tables(struct sk_buff *skb,
1042 struct netlink_callback *cb)
1044 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1045 struct nftables_pernet *nft_net;
1046 const struct nft_table *table;
1047 unsigned int idx = 0, s_idx = cb->args[0];
1048 struct net *net = sock_net(skb->sk);
1049 int family = nfmsg->nfgen_family;
1052 nft_net = nft_pernet(net);
1053 cb->seq = READ_ONCE(nft_net->base_seq);
1055 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1056 if (family != NFPROTO_UNSPEC && family != table->family)
1062 memset(&cb->args[1], 0,
1063 sizeof(cb->args) - sizeof(cb->args[0]));
1064 if (!nft_is_active(net, table))
1066 if (nf_tables_fill_table_info(skb, net,
1067 NETLINK_CB(cb->skb).portid,
1069 NFT_MSG_NEWTABLE, NLM_F_MULTI,
1070 table->family, table) < 0)
1073 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1083 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1084 const struct nlmsghdr *nlh,
1085 struct netlink_dump_control *c)
1089 if (!try_module_get(THIS_MODULE))
1093 err = netlink_dump_start(nlsk, skb, nlh, c);
1095 module_put(THIS_MODULE);
1100 /* called with rcu_read_lock held */
1101 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1102 const struct nlattr * const nla[])
1104 struct netlink_ext_ack *extack = info->extack;
1105 u8 genmask = nft_genmask_cur(info->net);
1106 u8 family = info->nfmsg->nfgen_family;
1107 const struct nft_table *table;
1108 struct net *net = info->net;
1109 struct sk_buff *skb2;
1112 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1113 struct netlink_dump_control c = {
1114 .dump = nf_tables_dump_tables,
1115 .module = THIS_MODULE,
1118 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1121 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1122 if (IS_ERR(table)) {
1123 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1124 return PTR_ERR(table);
1127 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1131 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1132 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1135 goto err_fill_table_info;
1137 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1139 err_fill_table_info:
1144 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1146 struct nft_chain *chain;
1149 list_for_each_entry(chain, &table->chains, list) {
1150 if (!nft_is_active_next(net, chain))
1152 if (!nft_is_base_chain(chain))
1155 if (cnt && i++ == cnt)
1158 nf_tables_unregister_hook(net, table, chain);
1162 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1164 struct nft_chain *chain;
1167 list_for_each_entry(chain, &table->chains, list) {
1168 if (!nft_is_active_next(net, chain))
1170 if (!nft_is_base_chain(chain))
1173 err = nf_tables_register_hook(net, table, chain);
1175 goto err_register_hooks;
1183 nft_table_disable(net, table, i);
1187 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1189 table->flags &= ~NFT_TABLE_F_DORMANT;
1190 nft_table_disable(net, table, 0);
1191 table->flags |= NFT_TABLE_F_DORMANT;
1194 #define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
1195 #define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
1196 #define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
1197 #define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
1198 __NFT_TABLE_F_WAS_AWAKEN)
1200 static int nf_tables_updtable(struct nft_ctx *ctx)
1202 struct nft_trans *trans;
1206 if (!ctx->nla[NFTA_TABLE_FLAGS])
1209 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1210 if (flags & ~NFT_TABLE_F_MASK)
1213 if (flags == ctx->table->flags)
1216 if ((nft_table_has_owner(ctx->table) &&
1217 !(flags & NFT_TABLE_F_OWNER)) ||
1218 (!nft_table_has_owner(ctx->table) &&
1219 flags & NFT_TABLE_F_OWNER))
1222 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1223 sizeof(struct nft_trans_table));
1227 if ((flags & NFT_TABLE_F_DORMANT) &&
1228 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1229 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1230 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1231 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1232 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1233 ctx->table->flags & NFT_TABLE_F_DORMANT) {
1234 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1235 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1236 ret = nf_tables_table_enable(ctx->net, ctx->table);
1238 goto err_register_hooks;
1240 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1244 nft_trans_table_update(trans) = true;
1245 nft_trans_commit_list_add_tail(ctx->net, trans);
1250 nft_trans_destroy(trans);
1254 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1256 const char *name = data;
1258 return jhash(name, strlen(name), seed);
1261 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1263 const struct nft_chain *chain = data;
1265 return nft_chain_hash(chain->name, 0, seed);
1268 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1271 const struct nft_chain *chain = ptr;
1272 const char *name = arg->key;
1274 return strcmp(chain->name, name);
1277 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1279 const struct nft_object_hash_key *k = data;
1281 seed ^= hash_ptr(k->table, 32);
1283 return jhash(k->name, strlen(k->name), seed);
1286 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1288 const struct nft_object *obj = data;
1290 return nft_objname_hash(&obj->key, 0, seed);
1293 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1296 const struct nft_object_hash_key *k = arg->key;
1297 const struct nft_object *obj = ptr;
1299 if (obj->key.table != k->table)
1302 return strcmp(obj->key.name, k->name);
1305 static bool nft_supported_family(u8 family)
1308 #ifdef CONFIG_NF_TABLES_INET
1309 || family == NFPROTO_INET
1311 #ifdef CONFIG_NF_TABLES_IPV4
1312 || family == NFPROTO_IPV4
1314 #ifdef CONFIG_NF_TABLES_ARP
1315 || family == NFPROTO_ARP
1317 #ifdef CONFIG_NF_TABLES_NETDEV
1318 || family == NFPROTO_NETDEV
1320 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1321 || family == NFPROTO_BRIDGE
1323 #ifdef CONFIG_NF_TABLES_IPV6
1324 || family == NFPROTO_IPV6
1329 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1330 const struct nlattr * const nla[])
1332 struct nftables_pernet *nft_net = nft_pernet(info->net);
1333 struct netlink_ext_ack *extack = info->extack;
1334 u8 genmask = nft_genmask_next(info->net);
1335 u8 family = info->nfmsg->nfgen_family;
1336 struct net *net = info->net;
1337 const struct nlattr *attr;
1338 struct nft_table *table;
1343 if (!nft_supported_family(family))
1346 lockdep_assert_held(&nft_net->commit_mutex);
1347 attr = nla[NFTA_TABLE_NAME];
1348 table = nft_table_lookup(net, attr, family, genmask,
1349 NETLINK_CB(skb).portid);
1350 if (IS_ERR(table)) {
1351 if (PTR_ERR(table) != -ENOENT)
1352 return PTR_ERR(table);
1354 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1355 NL_SET_BAD_ATTR(extack, attr);
1358 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1361 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1363 return nf_tables_updtable(&ctx);
1366 if (nla[NFTA_TABLE_FLAGS]) {
1367 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1368 if (flags & ~NFT_TABLE_F_MASK)
1373 table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1377 table->validate_state = nft_net->validate_state;
1378 table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1379 if (table->name == NULL)
1382 if (nla[NFTA_TABLE_USERDATA]) {
1383 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1384 if (table->udata == NULL)
1385 goto err_table_udata;
1387 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1390 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1394 INIT_LIST_HEAD(&table->chains);
1395 INIT_LIST_HEAD(&table->sets);
1396 INIT_LIST_HEAD(&table->objects);
1397 INIT_LIST_HEAD(&table->flowtables);
1398 table->family = family;
1399 table->flags = flags;
1400 table->handle = ++nft_net->table_handle;
1401 if (table->flags & NFT_TABLE_F_OWNER)
1402 table->nlpid = NETLINK_CB(skb).portid;
1404 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1405 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1409 list_add_tail_rcu(&table->list, &nft_net->tables);
1412 rhltable_destroy(&table->chains_ht);
1414 kfree(table->udata);
1423 static int nft_flush_table(struct nft_ctx *ctx)
1425 struct nft_flowtable *flowtable, *nft;
1426 struct nft_chain *chain, *nc;
1427 struct nft_object *obj, *ne;
1428 struct nft_set *set, *ns;
1431 list_for_each_entry(chain, &ctx->table->chains, list) {
1432 if (!nft_is_active_next(ctx->net, chain))
1435 if (nft_chain_is_bound(chain))
1440 err = nft_delrule_by_chain(ctx);
1445 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1446 if (!nft_is_active_next(ctx->net, set))
1449 if (nft_set_is_anonymous(set) &&
1450 !list_empty(&set->bindings))
1453 err = nft_delset(ctx, set);
1458 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1459 if (!nft_is_active_next(ctx->net, flowtable))
1462 err = nft_delflowtable(ctx, flowtable);
1467 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1468 if (!nft_is_active_next(ctx->net, obj))
1471 err = nft_delobj(ctx, obj);
1476 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1477 if (!nft_is_active_next(ctx->net, chain))
1480 if (nft_chain_is_bound(chain))
1485 err = nft_delchain(ctx);
1490 err = nft_deltable(ctx);
1495 static int nft_flush(struct nft_ctx *ctx, int family)
1497 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1498 const struct nlattr * const *nla = ctx->nla;
1499 struct nft_table *table, *nt;
1502 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1503 if (family != AF_UNSPEC && table->family != family)
1506 ctx->family = table->family;
1508 if (!nft_is_active_next(ctx->net, table))
1511 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1514 if (nla[NFTA_TABLE_NAME] &&
1515 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1520 err = nft_flush_table(ctx);
1528 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1529 const struct nlattr * const nla[])
1531 struct netlink_ext_ack *extack = info->extack;
1532 u8 genmask = nft_genmask_next(info->net);
1533 u8 family = info->nfmsg->nfgen_family;
1534 struct net *net = info->net;
1535 const struct nlattr *attr;
1536 struct nft_table *table;
1539 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1540 if (family == AF_UNSPEC ||
1541 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1542 return nft_flush(&ctx, family);
1544 if (nla[NFTA_TABLE_HANDLE]) {
1545 attr = nla[NFTA_TABLE_HANDLE];
1546 table = nft_table_lookup_byhandle(net, attr, genmask,
1547 NETLINK_CB(skb).portid);
1549 attr = nla[NFTA_TABLE_NAME];
1550 table = nft_table_lookup(net, attr, family, genmask,
1551 NETLINK_CB(skb).portid);
1554 if (IS_ERR(table)) {
1555 if (PTR_ERR(table) == -ENOENT &&
1556 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1559 NL_SET_BAD_ATTR(extack, attr);
1560 return PTR_ERR(table);
1563 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1567 ctx.family = family;
1570 return nft_flush_table(&ctx);
1573 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1575 if (WARN_ON(ctx->table->use > 0))
1578 rhltable_destroy(&ctx->table->chains_ht);
1579 kfree(ctx->table->name);
1580 kfree(ctx->table->udata);
1584 void nft_register_chain_type(const struct nft_chain_type *ctype)
1586 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1587 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1588 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1591 chain_type[ctype->family][ctype->type] = ctype;
1592 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1594 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1596 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1598 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1599 chain_type[ctype->family][ctype->type] = NULL;
1600 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1602 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1608 static struct nft_chain *
1609 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1611 struct nft_chain *chain;
1613 list_for_each_entry(chain, &table->chains, list) {
1614 if (chain->handle == handle &&
1615 nft_active_genmask(chain, genmask))
1619 return ERR_PTR(-ENOENT);
1622 static bool lockdep_commit_lock_is_held(const struct net *net)
1624 #ifdef CONFIG_PROVE_LOCKING
1625 struct nftables_pernet *nft_net = nft_pernet(net);
1627 return lockdep_is_held(&nft_net->commit_mutex);
1633 static struct nft_chain *nft_chain_lookup(struct net *net,
1634 struct nft_table *table,
1635 const struct nlattr *nla, u8 genmask)
1637 char search[NFT_CHAIN_MAXNAMELEN + 1];
1638 struct rhlist_head *tmp, *list;
1639 struct nft_chain *chain;
1642 return ERR_PTR(-EINVAL);
1644 nla_strscpy(search, nla, sizeof(search));
1646 WARN_ON(!rcu_read_lock_held() &&
1647 !lockdep_commit_lock_is_held(net));
1649 chain = ERR_PTR(-ENOENT);
1651 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1655 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1656 if (nft_active_genmask(chain, genmask))
1659 chain = ERR_PTR(-ENOENT);
1665 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1666 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1667 .len = NFT_TABLE_MAXNAMELEN - 1 },
1668 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1669 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1670 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1671 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1672 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1673 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1674 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1675 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1676 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1677 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1678 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1679 .len = NFT_USERDATA_MAXLEN },
1682 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1683 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1684 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1685 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1686 .len = IFNAMSIZ - 1 },
1689 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1691 struct nft_stats *cpu_stats, total;
1692 struct nlattr *nest;
1700 memset(&total, 0, sizeof(total));
1701 for_each_possible_cpu(cpu) {
1702 cpu_stats = per_cpu_ptr(stats, cpu);
1704 seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1705 pkts = cpu_stats->pkts;
1706 bytes = cpu_stats->bytes;
1707 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1709 total.bytes += bytes;
1711 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1713 goto nla_put_failure;
1715 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1716 NFTA_COUNTER_PAD) ||
1717 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1719 goto nla_put_failure;
1721 nla_nest_end(skb, nest);
1728 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1729 const struct nft_base_chain *basechain,
1730 const struct list_head *hook_list)
1732 const struct nf_hook_ops *ops = &basechain->ops;
1733 struct nft_hook *hook, *first = NULL;
1734 struct nlattr *nest, *nest_devs;
1737 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1739 goto nla_put_failure;
1740 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1741 goto nla_put_failure;
1742 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1743 goto nla_put_failure;
1745 if (nft_base_chain_netdev(family, ops->hooknum)) {
1746 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1748 goto nla_put_failure;
1751 hook_list = &basechain->hook_list;
1753 list_for_each_entry(hook, hook_list, list) {
1757 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1758 hook->ops.dev->name))
1759 goto nla_put_failure;
1762 nla_nest_end(skb, nest_devs);
1765 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1766 goto nla_put_failure;
1768 nla_nest_end(skb, nest);
1775 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1776 u32 portid, u32 seq, int event, u32 flags,
1777 int family, const struct nft_table *table,
1778 const struct nft_chain *chain,
1779 const struct list_head *hook_list)
1781 struct nlmsghdr *nlh;
1783 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1784 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1785 NFNETLINK_V0, nft_base_seq(net));
1787 goto nla_put_failure;
1789 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1790 nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1791 nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1793 goto nla_put_failure;
1795 if (event == NFT_MSG_DELCHAIN && !hook_list) {
1796 nlmsg_end(skb, nlh);
1800 if (nft_is_base_chain(chain)) {
1801 const struct nft_base_chain *basechain = nft_base_chain(chain);
1802 struct nft_stats __percpu *stats;
1804 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1805 goto nla_put_failure;
1807 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1808 htonl(basechain->policy)))
1809 goto nla_put_failure;
1811 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1812 goto nla_put_failure;
1814 stats = rcu_dereference_check(basechain->stats,
1815 lockdep_commit_lock_is_held(net));
1816 if (nft_dump_stats(skb, stats))
1817 goto nla_put_failure;
1821 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1822 goto nla_put_failure;
1824 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1825 goto nla_put_failure;
1828 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1829 goto nla_put_failure;
1831 nlmsg_end(skb, nlh);
1835 nlmsg_trim(skb, nlh);
1839 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1840 const struct list_head *hook_list)
1842 struct nftables_pernet *nft_net;
1843 struct sk_buff *skb;
1848 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1851 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1855 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1856 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1858 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1859 event, flags, ctx->family, ctx->table,
1860 ctx->chain, hook_list);
1866 nft_net = nft_pernet(ctx->net);
1867 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1870 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1873 static int nf_tables_dump_chains(struct sk_buff *skb,
1874 struct netlink_callback *cb)
1876 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1877 unsigned int idx = 0, s_idx = cb->args[0];
1878 struct net *net = sock_net(skb->sk);
1879 int family = nfmsg->nfgen_family;
1880 struct nftables_pernet *nft_net;
1881 const struct nft_table *table;
1882 const struct nft_chain *chain;
1885 nft_net = nft_pernet(net);
1886 cb->seq = READ_ONCE(nft_net->base_seq);
1888 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1889 if (family != NFPROTO_UNSPEC && family != table->family)
1892 list_for_each_entry_rcu(chain, &table->chains, list) {
1896 memset(&cb->args[1], 0,
1897 sizeof(cb->args) - sizeof(cb->args[0]));
1898 if (!nft_is_active(net, chain))
1900 if (nf_tables_fill_chain_info(skb, net,
1901 NETLINK_CB(cb->skb).portid,
1905 table->family, table,
1909 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1920 /* called with rcu_read_lock held */
1921 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1922 const struct nlattr * const nla[])
1924 struct netlink_ext_ack *extack = info->extack;
1925 u8 genmask = nft_genmask_cur(info->net);
1926 u8 family = info->nfmsg->nfgen_family;
1927 const struct nft_chain *chain;
1928 struct net *net = info->net;
1929 struct nft_table *table;
1930 struct sk_buff *skb2;
1933 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1934 struct netlink_dump_control c = {
1935 .dump = nf_tables_dump_chains,
1936 .module = THIS_MODULE,
1939 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1942 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1943 if (IS_ERR(table)) {
1944 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1945 return PTR_ERR(table);
1948 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1949 if (IS_ERR(chain)) {
1950 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1951 return PTR_ERR(chain);
1954 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1958 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1959 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1960 0, family, table, chain, NULL);
1962 goto err_fill_chain_info;
1964 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1966 err_fill_chain_info:
1971 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1972 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1973 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1976 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1978 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1979 struct nft_stats __percpu *newstats;
1980 struct nft_stats *stats;
1983 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1984 nft_counter_policy, NULL);
1986 return ERR_PTR(err);
1988 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1989 return ERR_PTR(-EINVAL);
1991 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1992 if (newstats == NULL)
1993 return ERR_PTR(-ENOMEM);
1995 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1996 * are not exposed to userspace.
1999 stats = this_cpu_ptr(newstats);
2000 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
2001 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
2007 static void nft_chain_stats_replace(struct nft_trans *trans)
2009 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
2011 if (!nft_trans_chain_stats(trans))
2014 nft_trans_chain_stats(trans) =
2015 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
2016 lockdep_commit_lock_is_held(trans->ctx.net));
2018 if (!nft_trans_chain_stats(trans))
2019 static_branch_inc(&nft_counters_enabled);
2022 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
2024 struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
2025 struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
2031 /* should be NULL either via abort or via successful commit */
2032 WARN_ON_ONCE(chain->blob_next);
2033 kvfree(chain->blob_next);
2036 void nf_tables_chain_destroy(struct nft_ctx *ctx)
2038 struct nft_chain *chain = ctx->chain;
2039 struct nft_hook *hook, *next;
2041 if (WARN_ON(chain->use > 0))
2044 /* no concurrent access possible anymore */
2045 nf_tables_chain_free_chain_rules(chain);
2047 if (nft_is_base_chain(chain)) {
2048 struct nft_base_chain *basechain = nft_base_chain(chain);
2050 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2051 list_for_each_entry_safe(hook, next,
2052 &basechain->hook_list, list) {
2053 list_del_rcu(&hook->list);
2054 kfree_rcu(hook, rcu);
2057 module_put(basechain->type->owner);
2058 if (rcu_access_pointer(basechain->stats)) {
2059 static_branch_dec(&nft_counters_enabled);
2060 free_percpu(rcu_dereference_raw(basechain->stats));
2063 kfree(chain->udata);
2067 kfree(chain->udata);
2072 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2073 const struct nlattr *attr)
2075 struct net_device *dev;
2076 char ifname[IFNAMSIZ];
2077 struct nft_hook *hook;
2080 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2083 goto err_hook_alloc;
2086 nla_strscpy(ifname, attr, IFNAMSIZ);
2087 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2088 * indirectly serializing all the other holders of the commit_mutex with
2091 dev = __dev_get_by_name(net, ifname);
2096 hook->ops.dev = dev;
2103 return ERR_PTR(err);
2106 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2107 const struct nft_hook *this)
2109 struct nft_hook *hook;
2111 list_for_each_entry(hook, hook_list, list) {
2112 if (this->ops.dev == hook->ops.dev)
2119 static int nf_tables_parse_netdev_hooks(struct net *net,
2120 const struct nlattr *attr,
2121 struct list_head *hook_list,
2122 struct netlink_ext_ack *extack)
2124 struct nft_hook *hook, *next;
2125 const struct nlattr *tmp;
2126 int rem, n = 0, err;
2128 nla_for_each_nested(tmp, attr, rem) {
2129 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2134 hook = nft_netdev_hook_alloc(net, tmp);
2136 NL_SET_BAD_ATTR(extack, tmp);
2137 err = PTR_ERR(hook);
2140 if (nft_hook_list_find(hook_list, hook)) {
2141 NL_SET_BAD_ATTR(extack, tmp);
2146 list_add_tail(&hook->list, hook_list);
2149 if (n == NFT_NETDEVICE_MAX) {
2158 list_for_each_entry_safe(hook, next, hook_list, list) {
2159 list_del(&hook->list);
2165 struct nft_chain_hook {
2168 const struct nft_chain_type *type;
2169 struct list_head list;
2172 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2173 struct list_head *hook_list,
2174 struct netlink_ext_ack *extack, u32 flags)
2176 struct nft_hook *hook;
2179 if (tb[NFTA_HOOK_DEV]) {
2180 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2182 NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2183 return PTR_ERR(hook);
2186 list_add_tail(&hook->list, hook_list);
2187 } else if (tb[NFTA_HOOK_DEVS]) {
2188 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2195 if (flags & NFT_CHAIN_HW_OFFLOAD &&
2196 list_empty(hook_list))
2202 static int nft_chain_parse_hook(struct net *net,
2203 struct nft_base_chain *basechain,
2204 const struct nlattr * const nla[],
2205 struct nft_chain_hook *hook, u8 family,
2206 u32 flags, struct netlink_ext_ack *extack)
2208 struct nftables_pernet *nft_net = nft_pernet(net);
2209 struct nlattr *ha[NFTA_HOOK_MAX + 1];
2210 const struct nft_chain_type *type;
2213 lockdep_assert_held(&nft_net->commit_mutex);
2214 lockdep_nfnl_nft_mutex_not_held();
2216 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2217 nla[NFTA_CHAIN_HOOK],
2218 nft_hook_policy, NULL);
2223 if (!ha[NFTA_HOOK_HOOKNUM] ||
2224 !ha[NFTA_HOOK_PRIORITY]) {
2225 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2229 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2230 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2232 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2236 if (nla[NFTA_CHAIN_TYPE]) {
2237 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2240 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2241 return PTR_ERR(type);
2244 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2247 if (type->type == NFT_CHAIN_T_NAT &&
2248 hook->priority <= NF_IP_PRI_CONNTRACK)
2251 if (ha[NFTA_HOOK_HOOKNUM]) {
2252 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2253 if (hook->num != basechain->ops.hooknum)
2256 if (ha[NFTA_HOOK_PRIORITY]) {
2257 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2258 if (hook->priority != basechain->ops.priority)
2262 type = basechain->type;
2265 if (!try_module_get(type->owner)) {
2266 if (nla[NFTA_CHAIN_TYPE])
2267 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2273 INIT_LIST_HEAD(&hook->list);
2274 if (nft_base_chain_netdev(family, hook->num)) {
2275 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2277 module_put(type->owner);
2280 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2281 module_put(type->owner);
2288 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2290 struct nft_hook *h, *next;
2292 list_for_each_entry_safe(h, next, &hook->list, list) {
2296 module_put(hook->type->owner);
2299 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2301 struct nft_rule_dp_last *lrule;
2303 BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2305 lrule = (struct nft_rule_dp_last *)ptr;
2306 lrule->end.is_last = 1;
2307 lrule->chain = chain;
2308 /* blob size does not include the trailer rule */
2311 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2314 struct nft_rule_blob *blob;
2319 size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2321 blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2326 nft_last_rule(chain, blob->data);
2331 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2332 const struct nft_chain_hook *hook,
2333 struct nft_chain *chain)
2336 ops->hooknum = hook->num;
2337 ops->priority = hook->priority;
2339 ops->hook = hook->type->hooks[ops->hooknum];
2340 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
2343 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2344 struct nft_chain_hook *hook, u32 flags)
2346 struct nft_chain *chain;
2349 basechain->type = hook->type;
2350 INIT_LIST_HEAD(&basechain->hook_list);
2351 chain = &basechain->chain;
2353 if (nft_base_chain_netdev(family, hook->num)) {
2354 list_splice_init(&hook->list, &basechain->hook_list);
2355 list_for_each_entry(h, &basechain->hook_list, list)
2356 nft_basechain_hook_init(&h->ops, family, hook, chain);
2358 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2360 chain->flags |= NFT_CHAIN_BASE | flags;
2361 basechain->policy = NF_ACCEPT;
2362 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2363 !nft_chain_offload_support(basechain)) {
2364 list_splice_init(&basechain->hook_list, &hook->list);
2368 flow_block_init(&basechain->flow_block);
2373 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2377 err = rhltable_insert_key(&table->chains_ht, chain->name,
2378 &chain->rhlhead, nft_chain_ht_params);
2382 list_add_tail_rcu(&chain->list, &table->chains);
2387 static u64 chain_id;
2389 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2390 u8 policy, u32 flags,
2391 struct netlink_ext_ack *extack)
2393 const struct nlattr * const *nla = ctx->nla;
2394 struct nft_table *table = ctx->table;
2395 struct nft_base_chain *basechain;
2396 struct net *net = ctx->net;
2397 char name[NFT_NAME_MAXLEN];
2398 struct nft_rule_blob *blob;
2399 struct nft_trans *trans;
2400 struct nft_chain *chain;
2403 if (nla[NFTA_CHAIN_HOOK]) {
2404 struct nft_stats __percpu *stats = NULL;
2405 struct nft_chain_hook hook = {};
2407 if (flags & NFT_CHAIN_BINDING)
2410 err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2415 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2416 if (basechain == NULL) {
2417 nft_chain_release_hook(&hook);
2420 chain = &basechain->chain;
2422 if (nla[NFTA_CHAIN_COUNTERS]) {
2423 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2424 if (IS_ERR(stats)) {
2425 nft_chain_release_hook(&hook);
2427 return PTR_ERR(stats);
2429 rcu_assign_pointer(basechain->stats, stats);
2432 err = nft_basechain_init(basechain, family, &hook, flags);
2434 nft_chain_release_hook(&hook);
2440 static_branch_inc(&nft_counters_enabled);
2442 if (flags & NFT_CHAIN_BASE)
2444 if (flags & NFT_CHAIN_HW_OFFLOAD)
2447 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2451 chain->flags = flags;
2455 INIT_LIST_HEAD(&chain->rules);
2456 chain->handle = nf_tables_alloc_handle(table);
2457 chain->table = table;
2459 if (nla[NFTA_CHAIN_NAME]) {
2460 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2462 if (!(flags & NFT_CHAIN_BINDING)) {
2464 goto err_destroy_chain;
2467 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2468 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2473 goto err_destroy_chain;
2476 if (nla[NFTA_CHAIN_USERDATA]) {
2477 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2478 if (chain->udata == NULL) {
2480 goto err_destroy_chain;
2482 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2485 blob = nf_tables_chain_alloc_rules(chain, 0);
2488 goto err_destroy_chain;
2491 RCU_INIT_POINTER(chain->blob_gen_0, blob);
2492 RCU_INIT_POINTER(chain->blob_gen_1, blob);
2494 err = nf_tables_register_hook(net, table, chain);
2496 goto err_destroy_chain;
2498 if (!nft_use_inc(&table->use)) {
2503 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2504 if (IS_ERR(trans)) {
2505 err = PTR_ERR(trans);
2506 goto err_unregister_hook;
2509 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2510 if (nft_is_base_chain(chain))
2511 nft_trans_chain_policy(trans) = policy;
2513 err = nft_chain_add(table, chain);
2515 nft_trans_destroy(trans);
2516 goto err_unregister_hook;
2521 err_unregister_hook:
2522 nft_use_dec_restore(&table->use);
2524 nf_tables_unregister_hook(net, table, chain);
2526 nf_tables_chain_destroy(ctx);
2531 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2532 u32 flags, const struct nlattr *attr,
2533 struct netlink_ext_ack *extack)
2535 const struct nlattr * const *nla = ctx->nla;
2536 struct nft_base_chain *basechain = NULL;
2537 struct nft_table *table = ctx->table;
2538 struct nft_chain *chain = ctx->chain;
2539 struct nft_chain_hook hook = {};
2540 struct nft_stats *stats = NULL;
2541 struct nft_hook *h, *next;
2542 struct nf_hook_ops *ops;
2543 struct nft_trans *trans;
2544 bool unregister = false;
2547 if (chain->flags ^ flags)
2550 INIT_LIST_HEAD(&hook.list);
2552 if (nla[NFTA_CHAIN_HOOK]) {
2553 if (!nft_is_base_chain(chain)) {
2554 NL_SET_BAD_ATTR(extack, attr);
2558 basechain = nft_base_chain(chain);
2559 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2560 ctx->family, flags, extack);
2564 if (basechain->type != hook.type) {
2565 nft_chain_release_hook(&hook);
2566 NL_SET_BAD_ATTR(extack, attr);
2570 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2571 list_for_each_entry_safe(h, next, &hook.list, list) {
2572 h->ops.pf = basechain->ops.pf;
2573 h->ops.hooknum = basechain->ops.hooknum;
2574 h->ops.priority = basechain->ops.priority;
2575 h->ops.priv = basechain->ops.priv;
2576 h->ops.hook = basechain->ops.hook;
2578 if (nft_hook_list_find(&basechain->hook_list, h)) {
2584 ops = &basechain->ops;
2585 if (ops->hooknum != hook.num ||
2586 ops->priority != hook.priority) {
2587 nft_chain_release_hook(&hook);
2588 NL_SET_BAD_ATTR(extack, attr);
2594 if (nla[NFTA_CHAIN_HANDLE] &&
2595 nla[NFTA_CHAIN_NAME]) {
2596 struct nft_chain *chain2;
2598 chain2 = nft_chain_lookup(ctx->net, table,
2599 nla[NFTA_CHAIN_NAME], genmask);
2600 if (!IS_ERR(chain2)) {
2601 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2607 if (nla[NFTA_CHAIN_COUNTERS]) {
2608 if (!nft_is_base_chain(chain)) {
2613 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2614 if (IS_ERR(stats)) {
2615 err = PTR_ERR(stats);
2620 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2621 nft_is_base_chain(chain) &&
2622 !list_empty(&hook.list)) {
2623 basechain = nft_base_chain(chain);
2624 ops = &basechain->ops;
2626 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2627 err = nft_netdev_register_hooks(ctx->net, &hook.list);
2635 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2636 sizeof(struct nft_trans_chain));
2640 nft_trans_chain_stats(trans) = stats;
2641 nft_trans_chain_update(trans) = true;
2643 if (nla[NFTA_CHAIN_POLICY])
2644 nft_trans_chain_policy(trans) = policy;
2646 nft_trans_chain_policy(trans) = -1;
2648 if (nla[NFTA_CHAIN_HANDLE] &&
2649 nla[NFTA_CHAIN_NAME]) {
2650 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2651 struct nft_trans *tmp;
2655 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2660 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2661 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2662 tmp->ctx.table == table &&
2663 nft_trans_chain_update(tmp) &&
2664 nft_trans_chain_name(tmp) &&
2665 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2666 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2672 nft_trans_chain_name(trans) = name;
2675 nft_trans_basechain(trans) = basechain;
2676 INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2677 list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2678 if (nla[NFTA_CHAIN_HOOK])
2679 module_put(hook.type->owner);
2681 nft_trans_commit_list_add_tail(ctx->net, trans);
2689 if (nla[NFTA_CHAIN_HOOK]) {
2690 list_for_each_entry_safe(h, next, &hook.list, list) {
2692 nf_unregister_net_hook(ctx->net, &h->ops);
2696 module_put(hook.type->owner);
2702 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2703 const struct nft_table *table,
2704 const struct nlattr *nla, u8 genmask)
2706 struct nftables_pernet *nft_net = nft_pernet(net);
2707 u32 id = ntohl(nla_get_be32(nla));
2708 struct nft_trans *trans;
2710 list_for_each_entry(trans, &nft_net->commit_list, list) {
2711 struct nft_chain *chain = trans->ctx.chain;
2713 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2714 chain->table == table &&
2715 id == nft_trans_chain_id(trans) &&
2716 nft_active_genmask(chain, genmask))
2719 return ERR_PTR(-ENOENT);
2722 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2723 const struct nlattr * const nla[])
2725 struct nftables_pernet *nft_net = nft_pernet(info->net);
2726 struct netlink_ext_ack *extack = info->extack;
2727 u8 genmask = nft_genmask_next(info->net);
2728 u8 family = info->nfmsg->nfgen_family;
2729 struct nft_chain *chain = NULL;
2730 struct net *net = info->net;
2731 const struct nlattr *attr;
2732 struct nft_table *table;
2733 u8 policy = NF_ACCEPT;
2738 lockdep_assert_held(&nft_net->commit_mutex);
2740 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2741 NETLINK_CB(skb).portid);
2742 if (IS_ERR(table)) {
2743 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2744 return PTR_ERR(table);
2748 attr = nla[NFTA_CHAIN_NAME];
2750 if (nla[NFTA_CHAIN_HANDLE]) {
2751 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2752 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2753 if (IS_ERR(chain)) {
2754 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2755 return PTR_ERR(chain);
2757 attr = nla[NFTA_CHAIN_HANDLE];
2758 } else if (nla[NFTA_CHAIN_NAME]) {
2759 chain = nft_chain_lookup(net, table, attr, genmask);
2760 if (IS_ERR(chain)) {
2761 if (PTR_ERR(chain) != -ENOENT) {
2762 NL_SET_BAD_ATTR(extack, attr);
2763 return PTR_ERR(chain);
2767 } else if (!nla[NFTA_CHAIN_ID]) {
2771 if (nla[NFTA_CHAIN_POLICY]) {
2772 if (chain != NULL &&
2773 !nft_is_base_chain(chain)) {
2774 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2778 if (chain == NULL &&
2779 nla[NFTA_CHAIN_HOOK] == NULL) {
2780 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2784 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2794 if (nla[NFTA_CHAIN_FLAGS])
2795 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2797 flags = chain->flags;
2799 if (flags & ~NFT_CHAIN_FLAGS)
2802 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2804 if (chain != NULL) {
2805 if (chain->flags & NFT_CHAIN_BINDING)
2808 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2809 NL_SET_BAD_ATTR(extack, attr);
2812 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2815 flags |= chain->flags & NFT_CHAIN_BASE;
2816 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2820 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2823 static int nft_delchain_hook(struct nft_ctx *ctx,
2824 struct nft_base_chain *basechain,
2825 struct netlink_ext_ack *extack)
2827 const struct nft_chain *chain = &basechain->chain;
2828 const struct nlattr * const *nla = ctx->nla;
2829 struct nft_chain_hook chain_hook = {};
2830 struct nft_hook *this, *hook;
2831 LIST_HEAD(chain_del_list);
2832 struct nft_trans *trans;
2835 err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2836 ctx->family, chain->flags, extack);
2840 list_for_each_entry(this, &chain_hook.list, list) {
2841 hook = nft_hook_list_find(&basechain->hook_list, this);
2844 goto err_chain_del_hook;
2846 list_move(&hook->list, &chain_del_list);
2849 trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2850 sizeof(struct nft_trans_chain));
2853 goto err_chain_del_hook;
2856 nft_trans_basechain(trans) = basechain;
2857 nft_trans_chain_update(trans) = true;
2858 INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2859 list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2860 nft_chain_release_hook(&chain_hook);
2862 nft_trans_commit_list_add_tail(ctx->net, trans);
2867 list_splice(&chain_del_list, &basechain->hook_list);
2868 nft_chain_release_hook(&chain_hook);
2873 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2874 const struct nlattr * const nla[])
2876 struct netlink_ext_ack *extack = info->extack;
2877 u8 genmask = nft_genmask_next(info->net);
2878 u8 family = info->nfmsg->nfgen_family;
2879 struct net *net = info->net;
2880 const struct nlattr *attr;
2881 struct nft_table *table;
2882 struct nft_chain *chain;
2883 struct nft_rule *rule;
2889 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2890 NETLINK_CB(skb).portid);
2891 if (IS_ERR(table)) {
2892 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2893 return PTR_ERR(table);
2896 if (nla[NFTA_CHAIN_HANDLE]) {
2897 attr = nla[NFTA_CHAIN_HANDLE];
2898 handle = be64_to_cpu(nla_get_be64(attr));
2899 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2901 attr = nla[NFTA_CHAIN_NAME];
2902 chain = nft_chain_lookup(net, table, attr, genmask);
2904 if (IS_ERR(chain)) {
2905 if (PTR_ERR(chain) == -ENOENT &&
2906 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2909 NL_SET_BAD_ATTR(extack, attr);
2910 return PTR_ERR(chain);
2913 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2915 if (nla[NFTA_CHAIN_HOOK]) {
2916 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2919 if (nft_is_base_chain(chain)) {
2920 struct nft_base_chain *basechain = nft_base_chain(chain);
2922 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2923 return nft_delchain_hook(&ctx, basechain, extack);
2927 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2932 list_for_each_entry(rule, &chain->rules, list) {
2933 if (!nft_is_active_next(net, rule))
2937 err = nft_delrule(&ctx, rule);
2942 /* There are rules and elements that are still holding references to us,
2943 * we cannot do a recursive removal in this case.
2946 NL_SET_BAD_ATTR(extack, attr);
2950 return nft_delchain(&ctx);
2958 * nft_register_expr - register nf_tables expr type
2961 * Registers the expr type for use with nf_tables. Returns zero on
2962 * success or a negative errno code otherwise.
2964 int nft_register_expr(struct nft_expr_type *type)
2966 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2967 if (type->family == NFPROTO_UNSPEC)
2968 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2970 list_add_rcu(&type->list, &nf_tables_expressions);
2971 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2974 EXPORT_SYMBOL_GPL(nft_register_expr);
2977 * nft_unregister_expr - unregister nf_tables expr type
2980 * Unregisters the expr typefor use with nf_tables.
2982 void nft_unregister_expr(struct nft_expr_type *type)
2984 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2985 list_del_rcu(&type->list);
2986 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2988 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2990 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2993 const struct nft_expr_type *type, *candidate = NULL;
2995 list_for_each_entry(type, &nf_tables_expressions, list) {
2996 if (!nla_strcmp(nla, type->name)) {
2997 if (!type->family && !candidate)
2999 else if (type->family == family)
3006 #ifdef CONFIG_MODULES
3007 static int nft_expr_type_request_module(struct net *net, u8 family,
3010 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3011 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3018 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3022 const struct nft_expr_type *type;
3025 return ERR_PTR(-EINVAL);
3027 type = __nft_expr_type_get(family, nla);
3028 if (type != NULL && try_module_get(type->owner))
3031 lockdep_nfnl_nft_mutex_not_held();
3032 #ifdef CONFIG_MODULES
3034 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3035 return ERR_PTR(-EAGAIN);
3037 if (nft_request_module(net, "nft-expr-%.*s",
3039 (char *)nla_data(nla)) == -EAGAIN)
3040 return ERR_PTR(-EAGAIN);
3043 return ERR_PTR(-ENOENT);
3046 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3047 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
3048 .len = NFT_MODULE_AUTOLOAD_LIMIT },
3049 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
3052 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3053 const struct nft_expr *expr, bool reset)
3055 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3056 goto nla_put_failure;
3058 if (expr->ops->dump) {
3059 struct nlattr *data = nla_nest_start_noflag(skb,
3062 goto nla_put_failure;
3063 if (expr->ops->dump(skb, expr, reset) < 0)
3064 goto nla_put_failure;
3065 nla_nest_end(skb, data);
3074 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3075 const struct nft_expr *expr, bool reset)
3077 struct nlattr *nest;
3079 nest = nla_nest_start_noflag(skb, attr);
3081 goto nla_put_failure;
3082 if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3083 goto nla_put_failure;
3084 nla_nest_end(skb, nest);
3091 struct nft_expr_info {
3092 const struct nft_expr_ops *ops;
3093 const struct nlattr *attr;
3094 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
3097 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3098 const struct nlattr *nla,
3099 struct nft_expr_info *info)
3101 const struct nft_expr_type *type;
3102 const struct nft_expr_ops *ops;
3103 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3106 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3107 nft_expr_policy, NULL);
3111 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3113 return PTR_ERR(type);
3115 if (tb[NFTA_EXPR_DATA]) {
3116 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3118 type->policy, NULL);
3122 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3124 if (type->select_ops != NULL) {
3125 ops = type->select_ops(ctx,
3126 (const struct nlattr * const *)info->tb);
3129 #ifdef CONFIG_MODULES
3131 if (nft_expr_type_request_module(ctx->net,
3133 tb[NFTA_EXPR_NAME]) != -EAGAIN)
3147 module_put(type->owner);
3151 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3152 struct nft_expr_info *info)
3154 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3155 const struct nft_expr_type *type;
3158 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3159 nft_expr_policy, NULL);
3163 if (!tb[NFTA_EXPR_DATA])
3166 type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3170 if (!type->inner_ops)
3173 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3175 type->policy, NULL);
3180 info->ops = type->inner_ops;
3188 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3189 const struct nft_expr_info *expr_info,
3190 struct nft_expr *expr)
3192 const struct nft_expr_ops *ops = expr_info->ops;
3197 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3208 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3209 struct nft_expr *expr)
3211 const struct nft_expr_type *type = expr->ops->type;
3213 if (expr->ops->destroy)
3214 expr->ops->destroy(ctx, expr);
3215 module_put(type->owner);
3218 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3219 const struct nlattr *nla)
3221 struct nft_expr_info expr_info;
3222 struct nft_expr *expr;
3223 struct module *owner;
3226 err = nf_tables_expr_parse(ctx, nla, &expr_info);
3228 goto err_expr_parse;
3231 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3232 goto err_expr_stateful;
3235 expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3237 goto err_expr_stateful;
3239 err = nf_tables_newexpr(ctx, &expr_info, expr);
3247 owner = expr_info.ops->type->owner;
3248 if (expr_info.ops->type->release_ops)
3249 expr_info.ops->type->release_ops(expr_info.ops);
3253 return ERR_PTR(err);
3256 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3260 if (src->ops->clone) {
3261 dst->ops = src->ops;
3262 err = src->ops->clone(dst, src);
3266 memcpy(dst, src, src->ops->size);
3269 __module_get(src->ops->type->owner);
3274 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3276 nf_tables_expr_destroy(ctx, expr);
3284 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3287 struct nft_rule *rule;
3289 // FIXME: this sucks
3290 list_for_each_entry_rcu(rule, &chain->rules, list) {
3291 if (handle == rule->handle)
3295 return ERR_PTR(-ENOENT);
3298 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3299 const struct nlattr *nla)
3302 return ERR_PTR(-EINVAL);
3304 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3307 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3308 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
3309 .len = NFT_TABLE_MAXNAMELEN - 1 },
3310 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
3311 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3312 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
3313 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3314 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
3315 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
3316 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
3317 .len = NFT_USERDATA_MAXLEN },
3318 [NFTA_RULE_ID] = { .type = NLA_U32 },
3319 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3320 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
3323 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3324 u32 portid, u32 seq, int event,
3325 u32 flags, int family,
3326 const struct nft_table *table,
3327 const struct nft_chain *chain,
3328 const struct nft_rule *rule, u64 handle,
3331 struct nlmsghdr *nlh;
3332 const struct nft_expr *expr, *next;
3333 struct nlattr *list;
3334 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3336 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3339 goto nla_put_failure;
3341 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3342 goto nla_put_failure;
3343 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3344 goto nla_put_failure;
3345 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3347 goto nla_put_failure;
3349 if (event != NFT_MSG_DELRULE && handle) {
3350 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3352 goto nla_put_failure;
3355 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3356 nft_flow_rule_stats(chain, rule);
3358 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3360 goto nla_put_failure;
3361 nft_rule_for_each_expr(expr, next, rule) {
3362 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3363 goto nla_put_failure;
3365 nla_nest_end(skb, list);
3368 struct nft_userdata *udata = nft_userdata(rule);
3369 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3371 goto nla_put_failure;
3374 nlmsg_end(skb, nlh);
3378 nlmsg_trim(skb, nlh);
3382 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3383 const struct nft_rule *rule, int event)
3385 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3386 const struct nft_rule *prule;
3387 struct sk_buff *skb;
3393 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3396 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3400 if (event == NFT_MSG_NEWRULE &&
3401 !list_is_first(&rule->list, &ctx->chain->rules) &&
3402 !list_is_last(&rule->list, &ctx->chain->rules)) {
3403 prule = list_prev_entry(rule, list);
3404 handle = prule->handle;
3406 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3407 flags |= NLM_F_APPEND;
3408 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3409 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3411 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3412 event, flags, ctx->family, ctx->table,
3413 ctx->chain, rule, handle, false);
3419 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3422 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3425 static void audit_log_rule_reset(const struct nft_table *table,
3426 unsigned int base_seq,
3427 unsigned int nentries)
3429 char *buf = kasprintf(GFP_ATOMIC, "%s:%u",
3430 table->name, base_seq);
3432 audit_log_nfcfg(buf, table->family, nentries,
3433 AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3437 struct nft_rule_dump_ctx {
3442 static int __nf_tables_dump_rules(struct sk_buff *skb,
3444 struct netlink_callback *cb,
3445 const struct nft_table *table,
3446 const struct nft_chain *chain,
3449 struct net *net = sock_net(skb->sk);
3450 const struct nft_rule *rule, *prule;
3451 unsigned int s_idx = cb->args[0];
3455 list_for_each_entry_rcu(rule, &chain->rules, list) {
3456 if (!nft_is_active(net, rule))
3461 memset(&cb->args[1], 0,
3462 sizeof(cb->args) - sizeof(cb->args[0]));
3465 handle = prule->handle;
3469 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3472 NLM_F_MULTI | NLM_F_APPEND,
3474 table, chain, rule, handle, reset) < 0)
3477 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3486 static int nf_tables_dump_rules(struct sk_buff *skb,
3487 struct netlink_callback *cb)
3489 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3490 const struct nft_rule_dump_ctx *ctx = cb->data;
3491 struct nft_table *table;
3492 const struct nft_chain *chain;
3493 unsigned int idx = 0;
3494 struct net *net = sock_net(skb->sk);
3495 int family = nfmsg->nfgen_family;
3496 struct nftables_pernet *nft_net;
3499 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3503 nft_net = nft_pernet(net);
3504 cb->seq = READ_ONCE(nft_net->base_seq);
3506 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3507 if (family != NFPROTO_UNSPEC && family != table->family)
3510 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3513 if (ctx && ctx->table && ctx->chain) {
3514 struct rhlist_head *list, *tmp;
3516 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3517 nft_chain_ht_params);
3521 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3522 if (!nft_is_active(net, chain))
3524 __nf_tables_dump_rules(skb, &idx,
3525 cb, table, chain, reset);
3531 list_for_each_entry_rcu(chain, &table->chains, list) {
3532 if (__nf_tables_dump_rules(skb, &idx,
3533 cb, table, chain, reset))
3537 if (ctx && ctx->table)
3543 if (reset && idx > cb->args[0])
3544 audit_log_rule_reset(table, cb->seq, idx - cb->args[0]);
3550 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3552 const struct nlattr * const *nla = cb->data;
3553 struct nft_rule_dump_ctx *ctx = NULL;
3555 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3556 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3560 if (nla[NFTA_RULE_TABLE]) {
3561 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3568 if (nla[NFTA_RULE_CHAIN]) {
3569 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3583 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3585 struct nft_rule_dump_ctx *ctx = cb->data;
3595 /* called with rcu_read_lock held */
3596 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3597 const struct nlattr * const nla[])
3599 struct netlink_ext_ack *extack = info->extack;
3600 u8 genmask = nft_genmask_cur(info->net);
3601 u8 family = info->nfmsg->nfgen_family;
3602 const struct nft_chain *chain;
3603 const struct nft_rule *rule;
3604 struct net *net = info->net;
3605 struct nft_table *table;
3606 struct sk_buff *skb2;
3610 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3611 struct netlink_dump_control c = {
3612 .start= nf_tables_dump_rules_start,
3613 .dump = nf_tables_dump_rules,
3614 .done = nf_tables_dump_rules_done,
3615 .module = THIS_MODULE,
3616 .data = (void *)nla,
3619 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3622 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3623 if (IS_ERR(table)) {
3624 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3625 return PTR_ERR(table);
3628 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3629 if (IS_ERR(chain)) {
3630 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3631 return PTR_ERR(chain);
3634 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3636 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3637 return PTR_ERR(rule);
3640 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3644 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3647 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3648 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3649 family, table, chain, rule, 0, reset);
3651 goto err_fill_rule_info;
3654 audit_log_rule_reset(table, nft_pernet(net)->base_seq, 1);
3656 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3663 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3665 struct nft_expr *expr, *next;
3668 * Careful: some expressions might not be initialized in case this
3669 * is called on error from nf_tables_newrule().
3671 expr = nft_expr_first(rule);
3672 while (nft_expr_more(rule, expr)) {
3673 next = nft_expr_next(expr);
3674 nf_tables_expr_destroy(ctx, expr);
3680 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3682 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3683 nf_tables_rule_destroy(ctx, rule);
3686 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3688 struct nft_expr *expr, *last;
3689 const struct nft_data *data;
3690 struct nft_rule *rule;
3693 if (ctx->level == NFT_JUMP_STACK_SIZE)
3696 list_for_each_entry(rule, &chain->rules, list) {
3697 if (fatal_signal_pending(current))
3700 if (!nft_is_active_next(ctx->net, rule))
3703 nft_rule_for_each_expr(expr, last, rule) {
3704 if (!expr->ops->validate)
3707 err = expr->ops->validate(ctx, expr, &data);
3715 EXPORT_SYMBOL_GPL(nft_chain_validate);
3717 static int nft_table_validate(struct net *net, const struct nft_table *table)
3719 struct nft_chain *chain;
3720 struct nft_ctx ctx = {
3722 .family = table->family,
3726 list_for_each_entry(chain, &table->chains, list) {
3727 if (!nft_is_base_chain(chain))
3731 err = nft_chain_validate(&ctx, chain);
3741 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3742 const struct nft_set_iter *iter,
3743 struct nft_set_elem *elem)
3745 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3746 struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3747 const struct nft_data *data;
3750 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3751 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3754 data = nft_set_ext_data(ext);
3755 switch (data->verdict.code) {
3759 err = nft_chain_validate(ctx, data->verdict.chain);
3771 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3773 u8 genmask = nft_genmask_next(ctx->net);
3774 struct nft_set_elem_catchall *catchall;
3775 struct nft_set_elem elem;
3776 struct nft_set_ext *ext;
3779 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3780 ext = nft_set_elem_ext(set, catchall->elem);
3781 if (!nft_set_elem_active(ext, genmask))
3784 elem.priv = catchall->elem;
3785 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3793 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3794 const struct nft_chain *chain,
3795 const struct nlattr *nla);
3797 #define NFT_RULE_MAXEXPRS 128
3799 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3800 const struct nlattr * const nla[])
3802 struct nftables_pernet *nft_net = nft_pernet(info->net);
3803 struct netlink_ext_ack *extack = info->extack;
3804 unsigned int size, i, n, ulen = 0, usize = 0;
3805 u8 genmask = nft_genmask_next(info->net);
3806 struct nft_rule *rule, *old_rule = NULL;
3807 struct nft_expr_info *expr_info = NULL;
3808 u8 family = info->nfmsg->nfgen_family;
3809 struct nft_flow_rule *flow = NULL;
3810 struct net *net = info->net;
3811 struct nft_userdata *udata;
3812 struct nft_table *table;
3813 struct nft_chain *chain;
3814 struct nft_trans *trans;
3815 u64 handle, pos_handle;
3816 struct nft_expr *expr;
3821 lockdep_assert_held(&nft_net->commit_mutex);
3823 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3824 NETLINK_CB(skb).portid);
3825 if (IS_ERR(table)) {
3826 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3827 return PTR_ERR(table);
3830 if (nla[NFTA_RULE_CHAIN]) {
3831 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3833 if (IS_ERR(chain)) {
3834 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3835 return PTR_ERR(chain);
3838 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3839 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3841 if (IS_ERR(chain)) {
3842 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3843 return PTR_ERR(chain);
3849 if (nft_chain_is_bound(chain))
3852 if (nla[NFTA_RULE_HANDLE]) {
3853 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3854 rule = __nft_rule_lookup(chain, handle);
3856 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3857 return PTR_ERR(rule);
3860 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3861 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3864 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3869 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3870 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3872 handle = nf_tables_alloc_handle(table);
3874 if (nla[NFTA_RULE_POSITION]) {
3875 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3876 old_rule = __nft_rule_lookup(chain, pos_handle);
3877 if (IS_ERR(old_rule)) {
3878 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3879 return PTR_ERR(old_rule);
3881 } else if (nla[NFTA_RULE_POSITION_ID]) {
3882 old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3883 if (IS_ERR(old_rule)) {
3884 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3885 return PTR_ERR(old_rule);
3890 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3894 if (nla[NFTA_RULE_EXPRESSIONS]) {
3895 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3896 sizeof(struct nft_expr_info),
3901 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3903 if (nla_type(tmp) != NFTA_LIST_ELEM)
3904 goto err_release_expr;
3905 if (n == NFT_RULE_MAXEXPRS)
3906 goto err_release_expr;
3907 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3909 NL_SET_BAD_ATTR(extack, tmp);
3910 goto err_release_expr;
3912 size += expr_info[n].ops->size;
3916 /* Check for overflow of dlen field */
3918 if (size >= 1 << 12)
3919 goto err_release_expr;
3921 if (nla[NFTA_RULE_USERDATA]) {
3922 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3924 usize = sizeof(struct nft_userdata) + ulen;
3928 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3930 goto err_release_expr;
3932 nft_activate_next(net, rule);
3934 rule->handle = handle;
3936 rule->udata = ulen ? 1 : 0;
3939 udata = nft_userdata(rule);
3940 udata->len = ulen - 1;
3941 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3944 expr = nft_expr_first(rule);
3945 for (i = 0; i < n; i++) {
3946 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3948 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3949 goto err_release_rule;
3952 if (expr_info[i].ops->validate)
3953 nft_validate_state_update(table, NFT_VALIDATE_NEED);
3955 expr_info[i].ops = NULL;
3956 expr = nft_expr_next(expr);
3959 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3960 flow = nft_flow_rule_create(net, rule);
3962 err = PTR_ERR(flow);
3963 goto err_release_rule;
3967 if (!nft_use_inc(&chain->use)) {
3969 goto err_release_rule;
3972 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3973 err = nft_delrule(&ctx, old_rule);
3975 goto err_destroy_flow_rule;
3977 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3978 if (trans == NULL) {
3980 goto err_destroy_flow_rule;
3982 list_add_tail_rcu(&rule->list, &old_rule->list);
3984 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3987 goto err_destroy_flow_rule;
3990 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3992 list_add_rcu(&rule->list, &old_rule->list);
3994 list_add_tail_rcu(&rule->list, &chain->rules);
3997 list_add_tail_rcu(&rule->list, &old_rule->list);
3999 list_add_rcu(&rule->list, &chain->rules);
4005 nft_trans_flow_rule(trans) = flow;
4007 if (table->validate_state == NFT_VALIDATE_DO)
4008 return nft_table_validate(net, table);
4012 err_destroy_flow_rule:
4013 nft_use_dec_restore(&chain->use);
4015 nft_flow_rule_destroy(flow);
4017 nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
4018 nf_tables_rule_destroy(&ctx, rule);
4020 for (i = 0; i < n; i++) {
4021 if (expr_info[i].ops) {
4022 module_put(expr_info[i].ops->type->owner);
4023 if (expr_info[i].ops->type->release_ops)
4024 expr_info[i].ops->type->release_ops(expr_info[i].ops);
4032 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4033 const struct nft_chain *chain,
4034 const struct nlattr *nla)
4036 struct nftables_pernet *nft_net = nft_pernet(net);
4037 u32 id = ntohl(nla_get_be32(nla));
4038 struct nft_trans *trans;
4040 list_for_each_entry(trans, &nft_net->commit_list, list) {
4041 if (trans->msg_type == NFT_MSG_NEWRULE &&
4042 trans->ctx.chain == chain &&
4043 id == nft_trans_rule_id(trans))
4044 return nft_trans_rule(trans);
4046 return ERR_PTR(-ENOENT);
4049 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4050 const struct nlattr * const nla[])
4052 struct netlink_ext_ack *extack = info->extack;
4053 u8 genmask = nft_genmask_next(info->net);
4054 u8 family = info->nfmsg->nfgen_family;
4055 struct nft_chain *chain = NULL;
4056 struct net *net = info->net;
4057 struct nft_table *table;
4058 struct nft_rule *rule;
4062 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4063 NETLINK_CB(skb).portid);
4064 if (IS_ERR(table)) {
4065 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4066 return PTR_ERR(table);
4069 if (nla[NFTA_RULE_CHAIN]) {
4070 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4072 if (IS_ERR(chain)) {
4073 if (PTR_ERR(chain) == -ENOENT &&
4074 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4077 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4078 return PTR_ERR(chain);
4080 if (nft_chain_is_bound(chain))
4084 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4087 if (nla[NFTA_RULE_HANDLE]) {
4088 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4090 if (PTR_ERR(rule) == -ENOENT &&
4091 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4094 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4095 return PTR_ERR(rule);
4098 err = nft_delrule(&ctx, rule);
4099 } else if (nla[NFTA_RULE_ID]) {
4100 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4102 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4103 return PTR_ERR(rule);
4106 err = nft_delrule(&ctx, rule);
4108 err = nft_delrule_by_chain(&ctx);
4111 list_for_each_entry(chain, &table->chains, list) {
4112 if (!nft_is_active_next(net, chain))
4114 if (nft_chain_is_bound(chain))
4118 err = nft_delrule_by_chain(&ctx);
4130 static const struct nft_set_type *nft_set_types[] = {
4131 &nft_set_hash_fast_type,
4133 &nft_set_rhash_type,
4134 &nft_set_bitmap_type,
4135 &nft_set_rbtree_type,
4136 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4137 &nft_set_pipapo_avx2_type,
4139 &nft_set_pipapo_type,
4142 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
4143 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4146 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4148 return (flags & type->features) == (flags & NFT_SET_FEATURES);
4152 * Select a set implementation based on the data characteristics and the
4153 * given policy. The total memory use might not be known if no size is
4154 * given, in that case the amount of memory per element is used.
4156 static const struct nft_set_ops *
4157 nft_select_set_ops(const struct nft_ctx *ctx,
4158 const struct nlattr * const nla[],
4159 const struct nft_set_desc *desc)
4161 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4162 const struct nft_set_ops *ops, *bops;
4163 struct nft_set_estimate est, best;
4164 const struct nft_set_type *type;
4168 lockdep_assert_held(&nft_net->commit_mutex);
4169 lockdep_nfnl_nft_mutex_not_held();
4171 if (nla[NFTA_SET_FLAGS] != NULL)
4172 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4179 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4180 type = nft_set_types[i];
4183 if (!nft_set_ops_candidate(type, flags))
4185 if (!ops->estimate(desc, flags, &est))
4188 switch (desc->policy) {
4189 case NFT_SET_POL_PERFORMANCE:
4190 if (est.lookup < best.lookup)
4192 if (est.lookup == best.lookup &&
4193 est.space < best.space)
4196 case NFT_SET_POL_MEMORY:
4198 if (est.space < best.space)
4200 if (est.space == best.space &&
4201 est.lookup < best.lookup)
4203 } else if (est.size < best.size || !bops) {
4218 return ERR_PTR(-EOPNOTSUPP);
4221 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4222 [NFTA_SET_TABLE] = { .type = NLA_STRING,
4223 .len = NFT_TABLE_MAXNAMELEN - 1 },
4224 [NFTA_SET_NAME] = { .type = NLA_STRING,
4225 .len = NFT_SET_MAXNAMELEN - 1 },
4226 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
4227 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
4228 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
4229 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
4230 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
4231 [NFTA_SET_POLICY] = { .type = NLA_U32 },
4232 [NFTA_SET_DESC] = { .type = NLA_NESTED },
4233 [NFTA_SET_ID] = { .type = NLA_U32 },
4234 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
4235 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
4236 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
4237 .len = NFT_USERDATA_MAXLEN },
4238 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
4239 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
4240 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
4241 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
4244 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4245 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
4246 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
4249 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4250 const struct nlattr *nla, u8 genmask)
4252 struct nft_set *set;
4255 return ERR_PTR(-EINVAL);
4257 list_for_each_entry_rcu(set, &table->sets, list) {
4258 if (!nla_strcmp(nla, set->name) &&
4259 nft_active_genmask(set, genmask))
4262 return ERR_PTR(-ENOENT);
4265 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4266 const struct nlattr *nla,
4269 struct nft_set *set;
4271 list_for_each_entry(set, &table->sets, list) {
4272 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4273 nft_active_genmask(set, genmask))
4276 return ERR_PTR(-ENOENT);
4279 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4280 const struct nft_table *table,
4281 const struct nlattr *nla, u8 genmask)
4283 struct nftables_pernet *nft_net = nft_pernet(net);
4284 u32 id = ntohl(nla_get_be32(nla));
4285 struct nft_trans *trans;
4287 list_for_each_entry(trans, &nft_net->commit_list, list) {
4288 if (trans->msg_type == NFT_MSG_NEWSET) {
4289 struct nft_set *set = nft_trans_set(trans);
4291 if (id == nft_trans_set_id(trans) &&
4292 set->table == table &&
4293 nft_active_genmask(set, genmask))
4297 return ERR_PTR(-ENOENT);
4300 struct nft_set *nft_set_lookup_global(const struct net *net,
4301 const struct nft_table *table,
4302 const struct nlattr *nla_set_name,
4303 const struct nlattr *nla_set_id,
4306 struct nft_set *set;
4308 set = nft_set_lookup(table, nla_set_name, genmask);
4313 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4317 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4319 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4322 const struct nft_set *i;
4324 unsigned long *inuse;
4325 unsigned int n = 0, min = 0;
4327 p = strchr(name, '%');
4329 if (p[1] != 'd' || strchr(p + 2, '%'))
4332 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4336 list_for_each_entry(i, &ctx->table->sets, list) {
4339 if (!nft_is_active_next(ctx->net, i))
4341 if (!sscanf(i->name, name, &tmp))
4343 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4346 set_bit(tmp - min, inuse);
4349 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4350 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4351 min += BITS_PER_BYTE * PAGE_SIZE;
4352 memset(inuse, 0, PAGE_SIZE);
4355 free_page((unsigned long)inuse);
4358 set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4362 list_for_each_entry(i, &ctx->table->sets, list) {
4363 if (!nft_is_active_next(ctx->net, i))
4365 if (!strcmp(set->name, i->name)) {
4374 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4376 u64 ms = be64_to_cpu(nla_get_be64(nla));
4377 u64 max = (u64)(~((u64)0));
4379 max = div_u64(max, NSEC_PER_MSEC);
4383 ms *= NSEC_PER_MSEC;
4384 *result = nsecs_to_jiffies64(ms);
4388 __be64 nf_jiffies64_to_msecs(u64 input)
4390 return cpu_to_be64(jiffies64_to_msecs(input));
4393 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4394 const struct nft_set *set)
4396 struct nlattr *concat, *field;
4399 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4403 for (i = 0; i < set->field_count; i++) {
4404 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4408 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4409 htonl(set->field_len[i])))
4412 nla_nest_end(skb, field);
4415 nla_nest_end(skb, concat);
4420 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4421 const struct nft_set *set, u16 event, u16 flags)
4423 u64 timeout = READ_ONCE(set->timeout);
4424 u32 gc_int = READ_ONCE(set->gc_int);
4425 u32 portid = ctx->portid;
4426 struct nlmsghdr *nlh;
4427 struct nlattr *nest;
4431 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4432 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4433 NFNETLINK_V0, nft_base_seq(ctx->net));
4435 goto nla_put_failure;
4437 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4438 goto nla_put_failure;
4439 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4440 goto nla_put_failure;
4441 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4443 goto nla_put_failure;
4445 if (event == NFT_MSG_DELSET) {
4446 nlmsg_end(skb, nlh);
4450 if (set->flags != 0)
4451 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4452 goto nla_put_failure;
4454 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4455 goto nla_put_failure;
4456 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4457 goto nla_put_failure;
4458 if (set->flags & NFT_SET_MAP) {
4459 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4460 goto nla_put_failure;
4461 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4462 goto nla_put_failure;
4464 if (set->flags & NFT_SET_OBJECT &&
4465 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4466 goto nla_put_failure;
4469 nla_put_be64(skb, NFTA_SET_TIMEOUT,
4470 nf_jiffies64_to_msecs(timeout),
4472 goto nla_put_failure;
4474 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4475 goto nla_put_failure;
4477 if (set->policy != NFT_SET_POL_PERFORMANCE) {
4478 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4479 goto nla_put_failure;
4483 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4484 goto nla_put_failure;
4486 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4488 goto nla_put_failure;
4490 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4491 goto nla_put_failure;
4493 if (set->field_count > 1 &&
4494 nf_tables_fill_set_concat(skb, set))
4495 goto nla_put_failure;
4497 nla_nest_end(skb, nest);
4499 if (set->num_exprs == 1) {
4500 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4501 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4502 goto nla_put_failure;
4504 nla_nest_end(skb, nest);
4505 } else if (set->num_exprs > 1) {
4506 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4508 goto nla_put_failure;
4510 for (i = 0; i < set->num_exprs; i++) {
4511 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4512 set->exprs[i], false) < 0)
4513 goto nla_put_failure;
4515 nla_nest_end(skb, nest);
4518 nlmsg_end(skb, nlh);
4522 nlmsg_trim(skb, nlh);
4526 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4527 const struct nft_set *set, int event,
4530 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4531 u32 portid = ctx->portid;
4532 struct sk_buff *skb;
4537 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4540 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4544 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4545 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4547 err = nf_tables_fill_set(skb, ctx, set, event, flags);
4553 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4556 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4559 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4561 const struct nft_set *set;
4562 unsigned int idx, s_idx = cb->args[0];
4563 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4564 struct net *net = sock_net(skb->sk);
4565 struct nft_ctx *ctx = cb->data, ctx_set;
4566 struct nftables_pernet *nft_net;
4572 nft_net = nft_pernet(net);
4573 cb->seq = READ_ONCE(nft_net->base_seq);
4575 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4576 if (ctx->family != NFPROTO_UNSPEC &&
4577 ctx->family != table->family)
4580 if (ctx->table && ctx->table != table)
4584 if (cur_table != table)
4590 list_for_each_entry_rcu(set, &table->sets, list) {
4593 if (!nft_is_active(net, set))
4597 ctx_set.table = table;
4598 ctx_set.family = table->family;
4600 if (nf_tables_fill_set(skb, &ctx_set, set,
4604 cb->args[2] = (unsigned long) table;
4607 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4620 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4622 struct nft_ctx *ctx_dump = NULL;
4624 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4625 if (ctx_dump == NULL)
4628 cb->data = ctx_dump;
4632 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4638 /* called with rcu_read_lock held */
4639 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4640 const struct nlattr * const nla[])
4642 struct netlink_ext_ack *extack = info->extack;
4643 u8 genmask = nft_genmask_cur(info->net);
4644 u8 family = info->nfmsg->nfgen_family;
4645 struct nft_table *table = NULL;
4646 struct net *net = info->net;
4647 const struct nft_set *set;
4648 struct sk_buff *skb2;
4652 if (nla[NFTA_SET_TABLE]) {
4653 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4655 if (IS_ERR(table)) {
4656 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4657 return PTR_ERR(table);
4661 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4663 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4664 struct netlink_dump_control c = {
4665 .start = nf_tables_dump_sets_start,
4666 .dump = nf_tables_dump_sets,
4667 .done = nf_tables_dump_sets_done,
4669 .module = THIS_MODULE,
4672 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4675 /* Only accept unspec with dump */
4676 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4677 return -EAFNOSUPPORT;
4678 if (!nla[NFTA_SET_TABLE])
4681 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4683 return PTR_ERR(set);
4685 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4689 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4691 goto err_fill_set_info;
4693 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4700 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4701 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4704 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4705 struct nft_set_desc *desc)
4707 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4711 if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4714 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4715 nft_concat_policy, NULL);
4719 if (!tb[NFTA_SET_FIELD_LEN])
4722 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4723 if (!len || len > U8_MAX)
4726 desc->field_len[desc->field_count++] = len;
4731 static int nft_set_desc_concat(struct nft_set_desc *desc,
4732 const struct nlattr *nla)
4734 struct nlattr *attr;
4738 nla_for_each_nested(attr, nla, rem) {
4739 if (nla_type(attr) != NFTA_LIST_ELEM)
4742 err = nft_set_desc_concat_parse(attr, desc);
4747 for (i = 0; i < desc->field_count; i++)
4748 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4750 if (num_regs > NFT_REG32_COUNT)
4756 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4757 const struct nlattr *nla)
4759 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4762 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4763 nft_set_desc_policy, NULL);
4767 if (da[NFTA_SET_DESC_SIZE] != NULL)
4768 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4769 if (da[NFTA_SET_DESC_CONCAT])
4770 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4775 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4776 const struct nlattr * const *nla,
4777 struct nft_expr **exprs, int *num_exprs,
4780 struct nft_expr *expr;
4783 if (nla[NFTA_SET_EXPR]) {
4784 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4786 err = PTR_ERR(expr);
4787 goto err_set_expr_alloc;
4791 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4795 if (!(flags & NFT_SET_EXPR)) {
4797 goto err_set_expr_alloc;
4800 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4801 if (i == NFT_SET_EXPR_MAX) {
4803 goto err_set_expr_alloc;
4805 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4807 goto err_set_expr_alloc;
4809 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4811 err = PTR_ERR(expr);
4812 goto err_set_expr_alloc;
4822 for (i = 0; i < *num_exprs; i++)
4823 nft_expr_destroy(ctx, exprs[i]);
4828 static bool nft_set_is_same(const struct nft_set *set,
4829 const struct nft_set_desc *desc,
4830 struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4834 if (set->ktype != desc->ktype ||
4835 set->dtype != desc->dtype ||
4836 set->flags != flags ||
4837 set->klen != desc->klen ||
4838 set->dlen != desc->dlen ||
4839 set->field_count != desc->field_count ||
4840 set->num_exprs != num_exprs)
4843 for (i = 0; i < desc->field_count; i++) {
4844 if (set->field_len[i] != desc->field_len[i])
4848 for (i = 0; i < num_exprs; i++) {
4849 if (set->exprs[i]->ops != exprs[i]->ops)
4856 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4857 const struct nlattr * const nla[])
4859 struct netlink_ext_ack *extack = info->extack;
4860 u8 genmask = nft_genmask_next(info->net);
4861 u8 family = info->nfmsg->nfgen_family;
4862 const struct nft_set_ops *ops;
4863 struct net *net = info->net;
4864 struct nft_set_desc desc;
4865 struct nft_table *table;
4866 unsigned char *udata;
4867 struct nft_set *set;
4877 if (nla[NFTA_SET_TABLE] == NULL ||
4878 nla[NFTA_SET_NAME] == NULL ||
4879 nla[NFTA_SET_KEY_LEN] == NULL ||
4880 nla[NFTA_SET_ID] == NULL)
4883 memset(&desc, 0, sizeof(desc));
4885 desc.ktype = NFT_DATA_VALUE;
4886 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4887 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4888 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4892 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4893 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4897 if (nla[NFTA_SET_FLAGS] != NULL) {
4898 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4899 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4900 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4901 NFT_SET_MAP | NFT_SET_EVAL |
4902 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4904 /* Only one of these operations is supported */
4905 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4906 (NFT_SET_MAP | NFT_SET_OBJECT))
4908 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4909 (NFT_SET_EVAL | NFT_SET_OBJECT))
4914 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4915 if (!(flags & NFT_SET_MAP))
4918 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4919 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4920 desc.dtype != NFT_DATA_VERDICT)
4923 if (desc.dtype != NFT_DATA_VERDICT) {
4924 if (nla[NFTA_SET_DATA_LEN] == NULL)
4926 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4927 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4930 desc.dlen = sizeof(struct nft_verdict);
4931 } else if (flags & NFT_SET_MAP)
4934 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4935 if (!(flags & NFT_SET_OBJECT))
4938 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4939 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4940 desc.objtype > NFT_OBJECT_MAX)
4942 } else if (flags & NFT_SET_OBJECT)
4945 desc.objtype = NFT_OBJECT_UNSPEC;
4948 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4949 if (!(flags & NFT_SET_TIMEOUT))
4952 if (flags & NFT_SET_ANONYMOUS)
4955 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4960 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4961 if (!(flags & NFT_SET_TIMEOUT))
4964 if (flags & NFT_SET_ANONYMOUS)
4967 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4970 desc.policy = NFT_SET_POL_PERFORMANCE;
4971 if (nla[NFTA_SET_POLICY] != NULL)
4972 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4974 if (nla[NFTA_SET_DESC] != NULL) {
4975 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4979 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4981 } else if (flags & NFT_SET_CONCAT) {
4985 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4988 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4989 NETLINK_CB(skb).portid);
4990 if (IS_ERR(table)) {
4991 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4992 return PTR_ERR(table);
4995 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4997 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4999 if (PTR_ERR(set) != -ENOENT) {
5000 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5001 return PTR_ERR(set);
5004 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
5006 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
5007 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5010 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
5013 if (nft_set_is_anonymous(set))
5016 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
5021 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
5022 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5026 for (i = 0; i < num_exprs; i++)
5027 nft_expr_destroy(&ctx, exprs[i]);
5032 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5035 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5038 ops = nft_select_set_ops(&ctx, nla, &desc);
5040 return PTR_ERR(ops);
5043 if (nla[NFTA_SET_USERDATA])
5044 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5047 if (ops->privsize != NULL)
5048 size = ops->privsize(nla, &desc);
5049 alloc_size = sizeof(*set) + size + udlen;
5050 if (alloc_size < size || alloc_size > INT_MAX)
5053 if (!nft_use_inc(&table->use))
5056 set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5062 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5068 err = nf_tables_set_alloc_name(&ctx, set, name);
5075 udata = set->data + size;
5076 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5079 INIT_LIST_HEAD(&set->bindings);
5080 INIT_LIST_HEAD(&set->catchall_list);
5081 refcount_set(&set->refs, 1);
5083 write_pnet(&set->net, net);
5085 set->ktype = desc.ktype;
5086 set->klen = desc.klen;
5087 set->dtype = desc.dtype;
5088 set->objtype = desc.objtype;
5089 set->dlen = desc.dlen;
5091 set->size = desc.size;
5092 set->policy = desc.policy;
5095 set->timeout = desc.timeout;
5096 set->gc_int = desc.gc_int;
5098 set->field_count = desc.field_count;
5099 for (i = 0; i < desc.field_count; i++)
5100 set->field_len[i] = desc.field_len[i];
5102 err = ops->init(set, &desc, nla);
5106 err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5108 goto err_set_destroy;
5110 set->num_exprs = num_exprs;
5111 set->handle = nf_tables_alloc_handle(table);
5112 INIT_LIST_HEAD(&set->pending_update);
5114 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5116 goto err_set_expr_alloc;
5118 list_add_tail_rcu(&set->list, &table->sets);
5123 for (i = 0; i < set->num_exprs; i++)
5124 nft_expr_destroy(&ctx, set->exprs[i]);
5126 ops->destroy(&ctx, set);
5132 nft_use_dec_restore(&table->use);
5137 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5138 struct nft_set *set)
5140 struct nft_set_elem_catchall *next, *catchall;
5142 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5143 list_del_rcu(&catchall->list);
5144 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5145 kfree_rcu(catchall, rcu);
5149 static void nft_set_put(struct nft_set *set)
5151 if (refcount_dec_and_test(&set->refs)) {
5157 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5161 if (WARN_ON(set->use > 0))
5164 for (i = 0; i < set->num_exprs; i++)
5165 nft_expr_destroy(ctx, set->exprs[i]);
5167 set->ops->destroy(ctx, set);
5168 nft_set_catchall_destroy(ctx, set);
5172 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5173 const struct nlattr * const nla[])
5175 struct netlink_ext_ack *extack = info->extack;
5176 u8 genmask = nft_genmask_next(info->net);
5177 u8 family = info->nfmsg->nfgen_family;
5178 struct net *net = info->net;
5179 const struct nlattr *attr;
5180 struct nft_table *table;
5181 struct nft_set *set;
5184 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5185 return -EAFNOSUPPORT;
5187 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5188 genmask, NETLINK_CB(skb).portid);
5189 if (IS_ERR(table)) {
5190 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5191 return PTR_ERR(table);
5194 if (nla[NFTA_SET_HANDLE]) {
5195 attr = nla[NFTA_SET_HANDLE];
5196 set = nft_set_lookup_byhandle(table, attr, genmask);
5198 attr = nla[NFTA_SET_NAME];
5199 set = nft_set_lookup(table, attr, genmask);
5203 if (PTR_ERR(set) == -ENOENT &&
5204 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5207 NL_SET_BAD_ATTR(extack, attr);
5208 return PTR_ERR(set);
5211 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5212 atomic_read(&set->nelems) > 0)) {
5213 NL_SET_BAD_ATTR(extack, attr);
5217 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5219 return nft_delset(&ctx, set);
5222 static int nft_validate_register_store(const struct nft_ctx *ctx,
5223 enum nft_registers reg,
5224 const struct nft_data *data,
5225 enum nft_data_types type,
5228 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5229 struct nft_set *set,
5230 struct nft_set_elem *elem)
5232 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5233 enum nft_registers dreg;
5235 dreg = nft_type_to_reg(set->dtype);
5236 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5237 set->dtype == NFT_DATA_VERDICT ?
5238 NFT_DATA_VERDICT : NFT_DATA_VALUE,
5242 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5243 struct nft_set *set,
5244 const struct nft_set_iter *iter,
5245 struct nft_set_elem *elem)
5247 return nft_setelem_data_validate(ctx, set, elem);
5250 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5251 struct nft_set *set)
5253 u8 genmask = nft_genmask_next(ctx->net);
5254 struct nft_set_elem_catchall *catchall;
5255 struct nft_set_elem elem;
5256 struct nft_set_ext *ext;
5259 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5260 ext = nft_set_elem_ext(set, catchall->elem);
5261 if (!nft_set_elem_active(ext, genmask))
5264 elem.priv = catchall->elem;
5265 ret = nft_setelem_data_validate(ctx, set, &elem);
5273 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5274 struct nft_set_binding *binding)
5276 struct nft_set_binding *i;
5277 struct nft_set_iter iter;
5279 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5282 if (binding->flags & NFT_SET_MAP) {
5283 /* If the set is already bound to the same chain all
5284 * jumps are already validated for that chain.
5286 list_for_each_entry(i, &set->bindings, list) {
5287 if (i->flags & NFT_SET_MAP &&
5288 i->chain == binding->chain)
5292 iter.genmask = nft_genmask_next(ctx->net);
5296 iter.fn = nf_tables_bind_check_setelem;
5298 set->ops->walk(ctx, set, &iter);
5300 iter.err = nft_set_catchall_bind_check(ctx, set);
5306 if (!nft_use_inc(&set->use))
5309 binding->chain = ctx->chain;
5310 list_add_tail_rcu(&binding->list, &set->bindings);
5311 nft_set_trans_bind(ctx, set);
5315 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5317 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5318 struct nft_set_binding *binding, bool event)
5320 list_del_rcu(&binding->list);
5322 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5323 list_del_rcu(&set->list);
5325 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5330 static void nft_setelem_data_activate(const struct net *net,
5331 const struct nft_set *set,
5332 struct nft_set_elem *elem);
5334 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5335 struct nft_set *set,
5336 const struct nft_set_iter *iter,
5337 struct nft_set_elem *elem)
5339 nft_setelem_data_activate(ctx->net, set, elem);
5344 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5345 struct nft_set *set)
5347 u8 genmask = nft_genmask_next(ctx->net);
5348 struct nft_set_elem_catchall *catchall;
5349 struct nft_set_elem elem;
5350 struct nft_set_ext *ext;
5352 list_for_each_entry(catchall, &set->catchall_list, list) {
5353 ext = nft_set_elem_ext(set, catchall->elem);
5354 if (!nft_set_elem_active(ext, genmask))
5357 elem.priv = catchall->elem;
5358 nft_setelem_data_activate(ctx->net, set, &elem);
5363 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5365 struct nft_set_iter iter = {
5366 .genmask = nft_genmask_next(ctx->net),
5367 .fn = nft_mapelem_activate,
5370 set->ops->walk(ctx, set, &iter);
5371 WARN_ON_ONCE(iter.err);
5373 nft_map_catchall_activate(ctx, set);
5376 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5378 if (nft_set_is_anonymous(set)) {
5379 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5380 nft_map_activate(ctx, set);
5382 nft_clear(ctx->net, set);
5385 nft_use_inc_restore(&set->use);
5387 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5389 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5390 struct nft_set_binding *binding,
5391 enum nft_trans_phase phase)
5394 case NFT_TRANS_PREPARE_ERROR:
5395 nft_set_trans_unbind(ctx, set);
5396 if (nft_set_is_anonymous(set))
5397 nft_deactivate_next(ctx->net, set);
5399 list_del_rcu(&binding->list);
5401 nft_use_dec(&set->use);
5403 case NFT_TRANS_PREPARE:
5404 if (nft_set_is_anonymous(set)) {
5405 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5406 nft_map_deactivate(ctx, set);
5408 nft_deactivate_next(ctx->net, set);
5410 nft_use_dec(&set->use);
5412 case NFT_TRANS_ABORT:
5413 case NFT_TRANS_RELEASE:
5414 if (nft_set_is_anonymous(set) &&
5415 set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5416 nft_map_deactivate(ctx, set);
5418 nft_use_dec(&set->use);
5421 nf_tables_unbind_set(ctx, set, binding,
5422 phase == NFT_TRANS_COMMIT);
5425 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5427 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5429 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5430 nft_set_destroy(ctx, set);
5432 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5434 const struct nft_set_ext_type nft_set_ext_types[] = {
5435 [NFT_SET_EXT_KEY] = {
5436 .align = __alignof__(u32),
5438 [NFT_SET_EXT_DATA] = {
5439 .align = __alignof__(u32),
5441 [NFT_SET_EXT_EXPRESSIONS] = {
5442 .align = __alignof__(struct nft_set_elem_expr),
5444 [NFT_SET_EXT_OBJREF] = {
5445 .len = sizeof(struct nft_object *),
5446 .align = __alignof__(struct nft_object *),
5448 [NFT_SET_EXT_FLAGS] = {
5450 .align = __alignof__(u8),
5452 [NFT_SET_EXT_TIMEOUT] = {
5454 .align = __alignof__(u64),
5456 [NFT_SET_EXT_EXPIRATION] = {
5458 .align = __alignof__(u64),
5460 [NFT_SET_EXT_USERDATA] = {
5461 .len = sizeof(struct nft_userdata),
5462 .align = __alignof__(struct nft_userdata),
5464 [NFT_SET_EXT_KEY_END] = {
5465 .align = __alignof__(u32),
5473 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5474 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
5475 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
5476 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
5477 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
5478 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
5479 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
5480 .len = NFT_USERDATA_MAXLEN },
5481 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
5482 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
5483 .len = NFT_OBJ_MAXNAMELEN - 1 },
5484 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
5485 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
5488 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5489 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
5490 .len = NFT_TABLE_MAXNAMELEN - 1 },
5491 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
5492 .len = NFT_SET_MAXNAMELEN - 1 },
5493 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
5494 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
5497 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5498 const struct nft_set *set,
5499 const struct nft_set_ext *ext,
5502 struct nft_set_elem_expr *elem_expr;
5503 u32 size, num_exprs = 0;
5504 struct nft_expr *expr;
5505 struct nlattr *nest;
5507 elem_expr = nft_set_ext_expr(ext);
5508 nft_setelem_expr_foreach(expr, elem_expr, size)
5511 if (num_exprs == 1) {
5512 expr = nft_setelem_expr_at(elem_expr, 0);
5513 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5517 } else if (num_exprs > 1) {
5518 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5520 goto nla_put_failure;
5522 nft_setelem_expr_foreach(expr, elem_expr, size) {
5523 expr = nft_setelem_expr_at(elem_expr, size);
5524 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5525 goto nla_put_failure;
5527 nla_nest_end(skb, nest);
5535 static int nf_tables_fill_setelem(struct sk_buff *skb,
5536 const struct nft_set *set,
5537 const struct nft_set_elem *elem,
5540 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5541 unsigned char *b = skb_tail_pointer(skb);
5542 struct nlattr *nest;
5545 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5547 goto nla_put_failure;
5549 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5550 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5551 NFT_DATA_VALUE, set->klen) < 0)
5552 goto nla_put_failure;
5554 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5555 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5556 NFT_DATA_VALUE, set->klen) < 0)
5557 goto nla_put_failure;
5559 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5560 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5561 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5563 goto nla_put_failure;
5565 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5566 nft_set_elem_expr_dump(skb, set, ext, reset))
5567 goto nla_put_failure;
5569 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5570 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5571 (*nft_set_ext_obj(ext))->key.name) < 0)
5572 goto nla_put_failure;
5574 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5575 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5576 htonl(*nft_set_ext_flags(ext))))
5577 goto nla_put_failure;
5579 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) {
5580 timeout = *nft_set_ext_timeout(ext);
5581 if (nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5582 nf_jiffies64_to_msecs(timeout),
5584 goto nla_put_failure;
5585 } else if (set->flags & NFT_SET_TIMEOUT) {
5586 timeout = READ_ONCE(set->timeout);
5589 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5590 u64 expires, now = get_jiffies_64();
5592 expires = *nft_set_ext_expiration(ext);
5593 if (time_before64(now, expires))
5598 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5599 nf_jiffies64_to_msecs(expires),
5601 goto nla_put_failure;
5604 *nft_set_ext_expiration(ext) = now + timeout;
5607 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5608 struct nft_userdata *udata;
5610 udata = nft_set_ext_userdata(ext);
5611 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5612 udata->len + 1, udata->data))
5613 goto nla_put_failure;
5616 nla_nest_end(skb, nest);
5624 struct nft_set_dump_args {
5625 const struct netlink_callback *cb;
5626 struct nft_set_iter iter;
5627 struct sk_buff *skb;
5631 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5632 struct nft_set *set,
5633 const struct nft_set_iter *iter,
5634 struct nft_set_elem *elem)
5636 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5637 struct nft_set_dump_args *args;
5639 if (nft_set_elem_expired(ext))
5642 args = container_of(iter, struct nft_set_dump_args, iter);
5643 return nf_tables_fill_setelem(args->skb, set, elem, args->reset);
5646 static void audit_log_nft_set_reset(const struct nft_table *table,
5647 unsigned int base_seq,
5648 unsigned int nentries)
5650 char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
5652 audit_log_nfcfg(buf, table->family, nentries,
5653 AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
5657 struct nft_set_dump_ctx {
5658 const struct nft_set *set;
5662 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5663 const struct nft_set *set, bool reset,
5664 unsigned int base_seq)
5666 struct nft_set_elem_catchall *catchall;
5667 u8 genmask = nft_genmask_cur(net);
5668 struct nft_set_elem elem;
5669 struct nft_set_ext *ext;
5672 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5673 ext = nft_set_elem_ext(set, catchall->elem);
5674 if (!nft_set_elem_active(ext, genmask) ||
5675 nft_set_elem_expired(ext))
5678 elem.priv = catchall->elem;
5679 ret = nf_tables_fill_setelem(skb, set, &elem, reset);
5681 audit_log_nft_set_reset(set->table, base_seq, 1);
5688 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5690 struct nft_set_dump_ctx *dump_ctx = cb->data;
5691 struct net *net = sock_net(skb->sk);
5692 struct nftables_pernet *nft_net;
5693 struct nft_table *table;
5694 struct nft_set *set;
5695 struct nft_set_dump_args args;
5696 bool set_found = false;
5697 struct nlmsghdr *nlh;
5698 struct nlattr *nest;
5704 nft_net = nft_pernet(net);
5705 cb->seq = READ_ONCE(nft_net->base_seq);
5707 list_for_each_entry_rcu(table, &nft_net->tables, list) {
5708 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5709 dump_ctx->ctx.family != table->family)
5712 if (table != dump_ctx->ctx.table)
5715 list_for_each_entry_rcu(set, &table->sets, list) {
5716 if (set == dump_ctx->set) {
5729 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5730 portid = NETLINK_CB(cb->skb).portid;
5731 seq = cb->nlh->nlmsg_seq;
5733 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5734 table->family, NFNETLINK_V0, nft_base_seq(net));
5736 goto nla_put_failure;
5738 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5739 goto nla_put_failure;
5740 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5741 goto nla_put_failure;
5743 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5745 goto nla_put_failure;
5747 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5753 args.iter.genmask = nft_genmask_cur(net);
5754 args.iter.skip = cb->args[0];
5755 args.iter.count = 0;
5757 args.iter.fn = nf_tables_dump_setelem;
5758 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5760 if (!args.iter.err && args.iter.count == cb->args[0])
5761 args.iter.err = nft_set_catchall_dump(net, skb, set,
5765 nla_nest_end(skb, nest);
5766 nlmsg_end(skb, nlh);
5768 if (reset && args.iter.count > args.iter.skip)
5769 audit_log_nft_set_reset(table, cb->seq,
5770 args.iter.count - args.iter.skip);
5772 if (args.iter.err && args.iter.err != -EMSGSIZE)
5773 return args.iter.err;
5774 if (args.iter.count == cb->args[0])
5777 cb->args[0] = args.iter.count;
5785 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5787 struct nft_set_dump_ctx *dump_ctx = cb->data;
5789 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5791 return cb->data ? 0 : -ENOMEM;
5794 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5800 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5801 const struct nft_ctx *ctx, u32 seq,
5802 u32 portid, int event, u16 flags,
5803 const struct nft_set *set,
5804 const struct nft_set_elem *elem,
5807 struct nlmsghdr *nlh;
5808 struct nlattr *nest;
5811 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5812 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5813 NFNETLINK_V0, nft_base_seq(ctx->net));
5815 goto nla_put_failure;
5817 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5818 goto nla_put_failure;
5819 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5820 goto nla_put_failure;
5822 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5824 goto nla_put_failure;
5826 err = nf_tables_fill_setelem(skb, set, elem, reset);
5828 goto nla_put_failure;
5830 nla_nest_end(skb, nest);
5832 nlmsg_end(skb, nlh);
5836 nlmsg_trim(skb, nlh);
5840 static int nft_setelem_parse_flags(const struct nft_set *set,
5841 const struct nlattr *attr, u32 *flags)
5846 *flags = ntohl(nla_get_be32(attr));
5847 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5849 if (!(set->flags & NFT_SET_INTERVAL) &&
5850 *flags & NFT_SET_ELEM_INTERVAL_END)
5852 if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5853 (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5859 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5860 struct nft_data *key, struct nlattr *attr)
5862 struct nft_data_desc desc = {
5863 .type = NFT_DATA_VALUE,
5864 .size = NFT_DATA_VALUE_MAXLEN,
5868 return nft_data_init(ctx, key, &desc, attr);
5871 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5872 struct nft_data_desc *desc,
5873 struct nft_data *data,
5874 struct nlattr *attr)
5878 if (set->dtype == NFT_DATA_VERDICT)
5879 dtype = NFT_DATA_VERDICT;
5881 dtype = NFT_DATA_VALUE;
5884 desc->size = NFT_DATA_VALUE_MAXLEN;
5885 desc->len = set->dlen;
5886 desc->flags = NFT_DATA_DESC_SETELEM;
5888 return nft_data_init(ctx, data, desc, attr);
5891 static void *nft_setelem_catchall_get(const struct net *net,
5892 const struct nft_set *set)
5894 struct nft_set_elem_catchall *catchall;
5895 u8 genmask = nft_genmask_cur(net);
5896 struct nft_set_ext *ext;
5899 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5900 ext = nft_set_elem_ext(set, catchall->elem);
5901 if (!nft_set_elem_active(ext, genmask) ||
5902 nft_set_elem_expired(ext))
5905 priv = catchall->elem;
5912 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5913 struct nft_set_elem *elem, u32 flags)
5917 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5918 priv = set->ops->get(ctx->net, set, elem, flags);
5920 return PTR_ERR(priv);
5922 priv = nft_setelem_catchall_get(ctx->net, set);
5931 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5932 const struct nlattr *attr, bool reset)
5934 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5935 struct nft_set_elem elem;
5936 struct sk_buff *skb;
5940 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5941 nft_set_elem_policy, NULL);
5945 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5949 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5952 if (nla[NFTA_SET_ELEM_KEY]) {
5953 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5954 nla[NFTA_SET_ELEM_KEY]);
5959 if (nla[NFTA_SET_ELEM_KEY_END]) {
5960 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5961 nla[NFTA_SET_ELEM_KEY_END]);
5966 err = nft_setelem_get(ctx, set, &elem, flags);
5971 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5975 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5976 NFT_MSG_NEWSETELEM, 0, set, &elem,
5979 goto err_fill_setelem;
5981 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5988 /* called with rcu_read_lock held */
5989 static int nf_tables_getsetelem(struct sk_buff *skb,
5990 const struct nfnl_info *info,
5991 const struct nlattr * const nla[])
5993 struct netlink_ext_ack *extack = info->extack;
5994 u8 genmask = nft_genmask_cur(info->net);
5995 u8 family = info->nfmsg->nfgen_family;
5996 int rem, err = 0, nelems = 0;
5997 struct net *net = info->net;
5998 struct nft_table *table;
5999 struct nft_set *set;
6000 struct nlattr *attr;
6004 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6006 if (IS_ERR(table)) {
6007 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6008 return PTR_ERR(table);
6011 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6013 return PTR_ERR(set);
6015 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6017 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6018 struct netlink_dump_control c = {
6019 .start = nf_tables_dump_set_start,
6020 .dump = nf_tables_dump_set,
6021 .done = nf_tables_dump_set_done,
6022 .module = THIS_MODULE,
6024 struct nft_set_dump_ctx dump_ctx = {
6030 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6033 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6036 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
6039 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6040 err = nft_get_set_elem(&ctx, set, attr, reset);
6042 NL_SET_BAD_ATTR(extack, attr);
6049 audit_log_nft_set_reset(table, nft_pernet(net)->base_seq,
6055 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
6056 const struct nft_set *set,
6057 const struct nft_set_elem *elem,
6060 struct nftables_pernet *nft_net;
6061 struct net *net = ctx->net;
6062 u32 portid = ctx->portid;
6063 struct sk_buff *skb;
6067 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6070 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6074 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6075 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6077 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6084 nft_net = nft_pernet(net);
6085 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6088 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6091 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6093 struct nft_set *set)
6095 struct nft_trans *trans;
6097 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6101 nft_trans_elem_set(trans) = set;
6105 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6106 const struct nft_set *set,
6107 const struct nlattr *attr)
6109 struct nft_expr *expr;
6112 expr = nft_expr_init(ctx, attr);
6117 if (expr->ops->type->flags & NFT_EXPR_GC) {
6118 if (set->flags & NFT_SET_TIMEOUT)
6119 goto err_set_elem_expr;
6120 if (!set->ops->gc_init)
6121 goto err_set_elem_expr;
6122 set->ops->gc_init(set);
6128 nft_expr_destroy(ctx, expr);
6129 return ERR_PTR(err);
6132 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6134 len += nft_set_ext_types[id].len;
6135 if (len > tmpl->ext_len[id] ||
6142 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6143 void *to, const void *from, u32 len)
6145 if (nft_set_ext_check(tmpl, id, len) < 0)
6148 memcpy(to, from, len);
6153 void *nft_set_elem_init(const struct nft_set *set,
6154 const struct nft_set_ext_tmpl *tmpl,
6155 const u32 *key, const u32 *key_end,
6156 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
6158 struct nft_set_ext *ext;
6161 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6163 return ERR_PTR(-ENOMEM);
6165 ext = nft_set_elem_ext(set, elem);
6166 nft_set_ext_init(ext, tmpl);
6168 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6169 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6170 nft_set_ext_key(ext), key, set->klen) < 0)
6173 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6174 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6175 nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6178 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6179 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6180 nft_set_ext_data(ext), data, set->dlen) < 0)
6183 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6184 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6185 if (expiration == 0)
6186 *nft_set_ext_expiration(ext) += timeout;
6188 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6189 *nft_set_ext_timeout(ext) = timeout;
6196 return ERR_PTR(-EINVAL);
6199 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6200 struct nft_expr *expr)
6202 if (expr->ops->destroy_clone) {
6203 expr->ops->destroy_clone(ctx, expr);
6204 module_put(expr->ops->type->owner);
6206 nf_tables_expr_destroy(ctx, expr);
6210 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6211 struct nft_set_elem_expr *elem_expr)
6213 struct nft_expr *expr;
6216 nft_setelem_expr_foreach(expr, elem_expr, size)
6217 __nft_set_elem_expr_destroy(ctx, expr);
6220 /* Drop references and destroy. Called from gc, dynset and abort path. */
6221 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
6224 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6225 struct nft_ctx ctx = {
6226 .net = read_pnet(&set->net),
6227 .family = set->table->family,
6230 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6231 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6232 nft_data_release(nft_set_ext_data(ext), set->dtype);
6233 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6234 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6236 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6237 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6240 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6242 /* Destroy element. References have been already dropped in the preparation
6243 * path via nft_setelem_data_deactivate().
6245 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6246 const struct nft_set *set, void *elem)
6248 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6250 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6251 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6256 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6257 struct nft_expr *expr_array[])
6259 struct nft_expr *expr;
6262 for (i = 0; i < set->num_exprs; i++) {
6263 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6267 err = nft_expr_clone(expr, set->exprs[i]);
6272 expr_array[i] = expr;
6278 for (k = i - 1; k >= 0; k--)
6279 nft_expr_destroy(ctx, expr_array[k]);
6284 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6285 const struct nft_set_ext_tmpl *tmpl,
6286 const struct nft_set_ext *ext,
6287 struct nft_expr *expr_array[],
6290 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6291 u32 len = sizeof(struct nft_set_elem_expr);
6292 struct nft_expr *expr;
6298 for (i = 0; i < num_exprs; i++)
6299 len += expr_array[i]->ops->size;
6301 if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6304 for (i = 0; i < num_exprs; i++) {
6305 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6306 err = nft_expr_clone(expr, expr_array[i]);
6308 goto err_elem_expr_setup;
6310 elem_expr->size += expr_array[i]->ops->size;
6311 nft_expr_destroy(ctx, expr_array[i]);
6312 expr_array[i] = NULL;
6317 err_elem_expr_setup:
6318 for (; i < num_exprs; i++) {
6319 nft_expr_destroy(ctx, expr_array[i]);
6320 expr_array[i] = NULL;
6326 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6327 const struct nft_set *set)
6329 struct nft_set_elem_catchall *catchall;
6330 u8 genmask = nft_genmask_cur(net);
6331 struct nft_set_ext *ext;
6333 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6334 ext = nft_set_elem_ext(set, catchall->elem);
6335 if (nft_set_elem_active(ext, genmask) &&
6336 !nft_set_elem_expired(ext) &&
6337 !nft_set_elem_is_dead(ext))
6343 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6345 static int nft_setelem_catchall_insert(const struct net *net,
6346 struct nft_set *set,
6347 const struct nft_set_elem *elem,
6348 struct nft_set_ext **pext)
6350 struct nft_set_elem_catchall *catchall;
6351 u8 genmask = nft_genmask_next(net);
6352 struct nft_set_ext *ext;
6354 list_for_each_entry(catchall, &set->catchall_list, list) {
6355 ext = nft_set_elem_ext(set, catchall->elem);
6356 if (nft_set_elem_active(ext, genmask)) {
6362 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6366 catchall->elem = elem->priv;
6367 list_add_tail_rcu(&catchall->list, &set->catchall_list);
6372 static int nft_setelem_insert(const struct net *net,
6373 struct nft_set *set,
6374 const struct nft_set_elem *elem,
6375 struct nft_set_ext **ext, unsigned int flags)
6379 if (flags & NFT_SET_ELEM_CATCHALL)
6380 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6382 ret = set->ops->insert(net, set, elem, ext);
6387 static bool nft_setelem_is_catchall(const struct nft_set *set,
6388 const struct nft_set_elem *elem)
6390 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6392 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6393 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6399 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6400 struct nft_set_elem *elem)
6402 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6404 if (nft_setelem_is_catchall(set, elem)) {
6405 nft_set_elem_change_active(net, set, ext);
6407 set->ops->activate(net, set, elem);
6411 static int nft_setelem_catchall_deactivate(const struct net *net,
6412 struct nft_set *set,
6413 struct nft_set_elem *elem)
6415 struct nft_set_elem_catchall *catchall;
6416 struct nft_set_ext *ext;
6418 list_for_each_entry(catchall, &set->catchall_list, list) {
6419 ext = nft_set_elem_ext(set, catchall->elem);
6420 if (!nft_is_active(net, ext))
6424 elem->priv = catchall->elem;
6425 nft_set_elem_change_active(net, set, ext);
6432 static int __nft_setelem_deactivate(const struct net *net,
6433 struct nft_set *set,
6434 struct nft_set_elem *elem)
6438 priv = set->ops->deactivate(net, set, elem);
6449 static int nft_setelem_deactivate(const struct net *net,
6450 struct nft_set *set,
6451 struct nft_set_elem *elem, u32 flags)
6455 if (flags & NFT_SET_ELEM_CATCHALL)
6456 ret = nft_setelem_catchall_deactivate(net, set, elem);
6458 ret = __nft_setelem_deactivate(net, set, elem);
6463 static void nft_setelem_catchall_remove(const struct net *net,
6464 const struct nft_set *set,
6465 const struct nft_set_elem *elem)
6467 struct nft_set_elem_catchall *catchall, *next;
6469 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6470 if (catchall->elem == elem->priv) {
6471 list_del_rcu(&catchall->list);
6472 kfree_rcu(catchall, rcu);
6478 static void nft_setelem_remove(const struct net *net,
6479 const struct nft_set *set,
6480 const struct nft_set_elem *elem)
6482 if (nft_setelem_is_catchall(set, elem))
6483 nft_setelem_catchall_remove(net, set, elem);
6485 set->ops->remove(net, set, elem);
6488 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6489 struct nlattr **nla, u32 flags)
6491 if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6492 (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6493 if (flags & NFT_SET_ELEM_INTERVAL_END)
6496 if (nla[NFTA_SET_ELEM_KEY_END] &&
6497 flags & NFT_SET_ELEM_CATCHALL)
6500 if (nla[NFTA_SET_ELEM_KEY_END])
6507 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6508 const struct nlattr *attr, u32 nlmsg_flags)
6510 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6511 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6512 u8 genmask = nft_genmask_next(ctx->net);
6513 u32 flags = 0, size = 0, num_exprs = 0;
6514 struct nft_set_ext_tmpl tmpl;
6515 struct nft_set_ext *ext, *ext2;
6516 struct nft_set_elem elem;
6517 struct nft_set_binding *binding;
6518 struct nft_object *obj = NULL;
6519 struct nft_userdata *udata;
6520 struct nft_data_desc desc;
6521 enum nft_registers dreg;
6522 struct nft_trans *trans;
6528 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6529 nft_set_elem_policy, NULL);
6533 nft_set_ext_prepare(&tmpl);
6535 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6539 if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6540 (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6544 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6549 if (set->flags & NFT_SET_MAP) {
6550 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6551 !(flags & NFT_SET_ELEM_INTERVAL_END))
6554 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6558 if (set->flags & NFT_SET_OBJECT) {
6559 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6560 !(flags & NFT_SET_ELEM_INTERVAL_END))
6563 if (nla[NFTA_SET_ELEM_OBJREF])
6567 if (!nft_setelem_valid_key_end(set, nla, flags))
6570 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6571 (nla[NFTA_SET_ELEM_DATA] ||
6572 nla[NFTA_SET_ELEM_OBJREF] ||
6573 nla[NFTA_SET_ELEM_TIMEOUT] ||
6574 nla[NFTA_SET_ELEM_EXPIRATION] ||
6575 nla[NFTA_SET_ELEM_USERDATA] ||
6576 nla[NFTA_SET_ELEM_EXPR] ||
6577 nla[NFTA_SET_ELEM_KEY_END] ||
6578 nla[NFTA_SET_ELEM_EXPRESSIONS]))
6582 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6583 if (!(set->flags & NFT_SET_TIMEOUT))
6585 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6589 } else if (set->flags & NFT_SET_TIMEOUT &&
6590 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6591 timeout = READ_ONCE(set->timeout);
6595 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6596 if (!(set->flags & NFT_SET_TIMEOUT))
6598 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6604 if (nla[NFTA_SET_ELEM_EXPR]) {
6605 struct nft_expr *expr;
6607 if (set->num_exprs && set->num_exprs != 1)
6610 expr = nft_set_elem_expr_alloc(ctx, set,
6611 nla[NFTA_SET_ELEM_EXPR]);
6613 return PTR_ERR(expr);
6615 expr_array[0] = expr;
6618 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6620 goto err_set_elem_expr;
6622 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6623 struct nft_expr *expr;
6628 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6629 if (i == NFT_SET_EXPR_MAX ||
6630 (set->num_exprs && set->num_exprs == i)) {
6632 goto err_set_elem_expr;
6634 if (nla_type(tmp) != NFTA_LIST_ELEM) {
6636 goto err_set_elem_expr;
6638 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6640 err = PTR_ERR(expr);
6641 goto err_set_elem_expr;
6643 expr_array[i] = expr;
6646 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6648 goto err_set_elem_expr;
6652 if (set->num_exprs && set->num_exprs != i) {
6654 goto err_set_elem_expr;
6656 } else if (set->num_exprs > 0 &&
6657 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6658 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6660 goto err_set_elem_expr_clone;
6662 num_exprs = set->num_exprs;
6665 if (nla[NFTA_SET_ELEM_KEY]) {
6666 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6667 nla[NFTA_SET_ELEM_KEY]);
6669 goto err_set_elem_expr;
6671 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6676 if (nla[NFTA_SET_ELEM_KEY_END]) {
6677 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6678 nla[NFTA_SET_ELEM_KEY_END]);
6682 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6684 goto err_parse_key_end;
6688 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6690 goto err_parse_key_end;
6692 if (timeout != READ_ONCE(set->timeout)) {
6693 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6695 goto err_parse_key_end;
6700 for (i = 0; i < num_exprs; i++)
6701 size += expr_array[i]->ops->size;
6703 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6704 sizeof(struct nft_set_elem_expr) + size);
6706 goto err_parse_key_end;
6709 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6710 obj = nft_obj_lookup(ctx->net, ctx->table,
6711 nla[NFTA_SET_ELEM_OBJREF],
6712 set->objtype, genmask);
6716 goto err_parse_key_end;
6719 if (!nft_use_inc(&obj->use)) {
6722 goto err_parse_key_end;
6725 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6727 goto err_parse_key_end;
6730 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6731 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6732 nla[NFTA_SET_ELEM_DATA]);
6734 goto err_parse_key_end;
6736 dreg = nft_type_to_reg(set->dtype);
6737 list_for_each_entry(binding, &set->bindings, list) {
6738 struct nft_ctx bind_ctx = {
6740 .family = ctx->family,
6741 .table = ctx->table,
6742 .chain = (struct nft_chain *)binding->chain,
6745 if (!(binding->flags & NFT_SET_MAP))
6748 err = nft_validate_register_store(&bind_ctx, dreg,
6750 desc.type, desc.len);
6752 goto err_parse_data;
6754 if (desc.type == NFT_DATA_VERDICT &&
6755 (elem.data.val.verdict.code == NFT_GOTO ||
6756 elem.data.val.verdict.code == NFT_JUMP))
6757 nft_validate_state_update(ctx->table,
6761 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6763 goto err_parse_data;
6766 /* The full maximum length of userdata can exceed the maximum
6767 * offset value (U8_MAX) for following extensions, therefor it
6768 * must be the last extension added.
6771 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6772 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6774 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6777 goto err_parse_data;
6781 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6782 elem.key_end.val.data, elem.data.val.data,
6783 timeout, expiration, GFP_KERNEL_ACCOUNT);
6784 if (IS_ERR(elem.priv)) {
6785 err = PTR_ERR(elem.priv);
6786 goto err_parse_data;
6789 ext = nft_set_elem_ext(set, elem.priv);
6791 *nft_set_ext_flags(ext) = flags;
6794 *nft_set_ext_obj(ext) = obj;
6797 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6801 udata = nft_set_ext_userdata(ext);
6802 udata->len = ulen - 1;
6803 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6805 err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6809 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6810 if (trans == NULL) {
6815 ext->genmask = nft_genmask_cur(ctx->net);
6817 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6819 if (err == -EEXIST) {
6820 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6821 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6822 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6823 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6824 goto err_element_clash;
6825 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6826 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6827 memcmp(nft_set_ext_data(ext),
6828 nft_set_ext_data(ext2), set->dlen) != 0) ||
6829 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6830 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6831 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6832 goto err_element_clash;
6833 else if (!(nlmsg_flags & NLM_F_EXCL))
6835 } else if (err == -ENOTEMPTY) {
6836 /* ENOTEMPTY reports overlapping between this element
6837 * and an existing one.
6841 goto err_element_clash;
6844 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6845 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
6847 if (!atomic_add_unless(&set->nelems, 1, max)) {
6853 nft_trans_elem(trans) = elem;
6854 nft_trans_commit_list_add_tail(ctx->net, trans);
6858 nft_setelem_remove(ctx->net, set, &elem);
6862 nf_tables_set_elem_destroy(ctx, set, elem.priv);
6864 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6865 nft_data_release(&elem.data.val, desc.type);
6868 nft_use_dec_restore(&obj->use);
6870 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6872 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6874 for (i = 0; i < num_exprs && expr_array[i]; i++)
6875 nft_expr_destroy(ctx, expr_array[i]);
6876 err_set_elem_expr_clone:
6880 static int nf_tables_newsetelem(struct sk_buff *skb,
6881 const struct nfnl_info *info,
6882 const struct nlattr * const nla[])
6884 struct netlink_ext_ack *extack = info->extack;
6885 u8 genmask = nft_genmask_next(info->net);
6886 u8 family = info->nfmsg->nfgen_family;
6887 struct net *net = info->net;
6888 const struct nlattr *attr;
6889 struct nft_table *table;
6890 struct nft_set *set;
6894 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6897 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6898 genmask, NETLINK_CB(skb).portid);
6899 if (IS_ERR(table)) {
6900 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6901 return PTR_ERR(table);
6904 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6905 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6907 return PTR_ERR(set);
6909 if (!list_empty(&set->bindings) &&
6910 (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
6913 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6915 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6916 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6918 NL_SET_BAD_ATTR(extack, attr);
6923 if (table->validate_state == NFT_VALIDATE_DO)
6924 return nft_table_validate(net, table);
6930 * nft_data_hold - hold a nft_data item
6932 * @data: struct nft_data to release
6933 * @type: type of data
6935 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6936 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6937 * NFT_GOTO verdicts. This function must be called on active data objects
6938 * from the second phase of the commit protocol.
6940 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6942 struct nft_chain *chain;
6944 if (type == NFT_DATA_VERDICT) {
6945 switch (data->verdict.code) {
6948 chain = data->verdict.chain;
6949 nft_use_inc_restore(&chain->use);
6955 static void nft_setelem_data_activate(const struct net *net,
6956 const struct nft_set *set,
6957 struct nft_set_elem *elem)
6959 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6961 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6962 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6963 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6964 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
6967 void nft_setelem_data_deactivate(const struct net *net,
6968 const struct nft_set *set,
6969 struct nft_set_elem *elem)
6971 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6973 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6974 nft_data_release(nft_set_ext_data(ext), set->dtype);
6975 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6976 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6979 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6980 const struct nlattr *attr)
6982 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6983 struct nft_set_ext_tmpl tmpl;
6984 struct nft_set_elem elem;
6985 struct nft_set_ext *ext;
6986 struct nft_trans *trans;
6990 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6991 nft_set_elem_policy, NULL);
6995 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6999 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
7002 if (!nft_setelem_valid_key_end(set, nla, flags))
7005 nft_set_ext_prepare(&tmpl);
7008 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
7013 if (nla[NFTA_SET_ELEM_KEY]) {
7014 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
7015 nla[NFTA_SET_ELEM_KEY]);
7019 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7024 if (nla[NFTA_SET_ELEM_KEY_END]) {
7025 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
7026 nla[NFTA_SET_ELEM_KEY_END]);
7030 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
7032 goto fail_elem_key_end;
7036 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7037 elem.key_end.val.data, NULL, 0, 0,
7038 GFP_KERNEL_ACCOUNT);
7039 if (IS_ERR(elem.priv)) {
7040 err = PTR_ERR(elem.priv);
7041 goto fail_elem_key_end;
7044 ext = nft_set_elem_ext(set, elem.priv);
7046 *nft_set_ext_flags(ext) = flags;
7048 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7052 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7056 nft_setelem_data_deactivate(ctx->net, set, &elem);
7058 nft_trans_elem(trans) = elem;
7059 nft_trans_commit_list_add_tail(ctx->net, trans);
7067 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7069 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7073 static int nft_setelem_flush(const struct nft_ctx *ctx,
7074 struct nft_set *set,
7075 const struct nft_set_iter *iter,
7076 struct nft_set_elem *elem)
7078 struct nft_trans *trans;
7081 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7082 sizeof(struct nft_trans_elem), GFP_ATOMIC);
7086 if (!set->ops->flush(ctx->net, set, elem->priv)) {
7092 nft_setelem_data_deactivate(ctx->net, set, elem);
7093 nft_trans_elem_set(trans) = set;
7094 nft_trans_elem(trans) = *elem;
7095 nft_trans_commit_list_add_tail(ctx->net, trans);
7103 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7104 struct nft_set *set,
7105 struct nft_set_elem *elem)
7107 struct nft_trans *trans;
7109 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7110 sizeof(struct nft_trans_elem), GFP_KERNEL);
7114 nft_setelem_data_deactivate(ctx->net, set, elem);
7115 nft_trans_elem_set(trans) = set;
7116 nft_trans_elem(trans) = *elem;
7117 nft_trans_commit_list_add_tail(ctx->net, trans);
7122 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7123 struct nft_set *set)
7125 u8 genmask = nft_genmask_next(ctx->net);
7126 struct nft_set_elem_catchall *catchall;
7127 struct nft_set_elem elem;
7128 struct nft_set_ext *ext;
7131 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7132 ext = nft_set_elem_ext(set, catchall->elem);
7133 if (!nft_set_elem_active(ext, genmask))
7136 elem.priv = catchall->elem;
7137 ret = __nft_set_catchall_flush(ctx, set, &elem);
7140 nft_set_elem_change_active(ctx->net, set, ext);
7146 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7148 struct nft_set_iter iter = {
7150 .fn = nft_setelem_flush,
7153 set->ops->walk(ctx, set, &iter);
7155 iter.err = nft_set_catchall_flush(ctx, set);
7160 static int nf_tables_delsetelem(struct sk_buff *skb,
7161 const struct nfnl_info *info,
7162 const struct nlattr * const nla[])
7164 struct netlink_ext_ack *extack = info->extack;
7165 u8 genmask = nft_genmask_next(info->net);
7166 u8 family = info->nfmsg->nfgen_family;
7167 struct net *net = info->net;
7168 const struct nlattr *attr;
7169 struct nft_table *table;
7170 struct nft_set *set;
7174 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7175 genmask, NETLINK_CB(skb).portid);
7176 if (IS_ERR(table)) {
7177 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7178 return PTR_ERR(table);
7181 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7183 return PTR_ERR(set);
7185 if (!list_empty(&set->bindings) &&
7186 (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
7189 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7191 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7192 return nft_set_flush(&ctx, set, genmask);
7194 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7195 err = nft_del_setelem(&ctx, set, attr);
7196 if (err == -ENOENT &&
7197 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7201 NL_SET_BAD_ATTR(extack, attr);
7213 * nft_register_obj- register nf_tables stateful object type
7214 * @obj_type: object type
7216 * Registers the object type for use with nf_tables. Returns zero on
7217 * success or a negative errno code otherwise.
7219 int nft_register_obj(struct nft_object_type *obj_type)
7221 if (obj_type->type == NFT_OBJECT_UNSPEC)
7224 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7225 list_add_rcu(&obj_type->list, &nf_tables_objects);
7226 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7229 EXPORT_SYMBOL_GPL(nft_register_obj);
7232 * nft_unregister_obj - unregister nf_tables object type
7233 * @obj_type: object type
7235 * Unregisters the object type for use with nf_tables.
7237 void nft_unregister_obj(struct nft_object_type *obj_type)
7239 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7240 list_del_rcu(&obj_type->list);
7241 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7243 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7245 struct nft_object *nft_obj_lookup(const struct net *net,
7246 const struct nft_table *table,
7247 const struct nlattr *nla, u32 objtype,
7250 struct nft_object_hash_key k = { .table = table };
7251 char search[NFT_OBJ_MAXNAMELEN];
7252 struct rhlist_head *tmp, *list;
7253 struct nft_object *obj;
7255 nla_strscpy(search, nla, sizeof(search));
7258 WARN_ON_ONCE(!rcu_read_lock_held() &&
7259 !lockdep_commit_lock_is_held(net));
7262 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7266 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7267 if (objtype == obj->ops->type->type &&
7268 nft_active_genmask(obj, genmask)) {
7275 return ERR_PTR(-ENOENT);
7277 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7279 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7280 const struct nlattr *nla,
7281 u32 objtype, u8 genmask)
7283 struct nft_object *obj;
7285 list_for_each_entry(obj, &table->objects, list) {
7286 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7287 objtype == obj->ops->type->type &&
7288 nft_active_genmask(obj, genmask))
7291 return ERR_PTR(-ENOENT);
7294 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7295 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
7296 .len = NFT_TABLE_MAXNAMELEN - 1 },
7297 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
7298 .len = NFT_OBJ_MAXNAMELEN - 1 },
7299 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
7300 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
7301 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
7302 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
7303 .len = NFT_USERDATA_MAXLEN },
7306 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7307 const struct nft_object_type *type,
7308 const struct nlattr *attr)
7311 const struct nft_object_ops *ops;
7312 struct nft_object *obj;
7315 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7320 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7321 type->policy, NULL);
7325 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7328 if (type->select_ops) {
7329 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7339 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7343 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7356 return ERR_PTR(err);
7359 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7360 struct nft_object *obj, bool reset)
7362 struct nlattr *nest;
7364 nest = nla_nest_start_noflag(skb, attr);
7366 goto nla_put_failure;
7367 if (obj->ops->dump(skb, obj, reset) < 0)
7368 goto nla_put_failure;
7369 nla_nest_end(skb, nest);
7376 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
7378 const struct nft_object_type *type;
7380 list_for_each_entry(type, &nf_tables_objects, list) {
7381 if (objtype == type->type)
7387 static const struct nft_object_type *
7388 nft_obj_type_get(struct net *net, u32 objtype)
7390 const struct nft_object_type *type;
7392 type = __nft_obj_type_get(objtype);
7393 if (type != NULL && try_module_get(type->owner))
7396 lockdep_nfnl_nft_mutex_not_held();
7397 #ifdef CONFIG_MODULES
7399 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7400 return ERR_PTR(-EAGAIN);
7403 return ERR_PTR(-ENOENT);
7406 static int nf_tables_updobj(const struct nft_ctx *ctx,
7407 const struct nft_object_type *type,
7408 const struct nlattr *attr,
7409 struct nft_object *obj)
7411 struct nft_object *newobj;
7412 struct nft_trans *trans;
7415 if (!try_module_get(type->owner))
7418 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7419 sizeof(struct nft_trans_obj));
7423 newobj = nft_obj_init(ctx, type, attr);
7424 if (IS_ERR(newobj)) {
7425 err = PTR_ERR(newobj);
7426 goto err_free_trans;
7429 nft_trans_obj(trans) = obj;
7430 nft_trans_obj_update(trans) = true;
7431 nft_trans_obj_newobj(trans) = newobj;
7432 nft_trans_commit_list_add_tail(ctx->net, trans);
7439 module_put(type->owner);
7443 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7444 const struct nlattr * const nla[])
7446 struct netlink_ext_ack *extack = info->extack;
7447 u8 genmask = nft_genmask_next(info->net);
7448 u8 family = info->nfmsg->nfgen_family;
7449 const struct nft_object_type *type;
7450 struct net *net = info->net;
7451 struct nft_table *table;
7452 struct nft_object *obj;
7457 if (!nla[NFTA_OBJ_TYPE] ||
7458 !nla[NFTA_OBJ_NAME] ||
7459 !nla[NFTA_OBJ_DATA])
7462 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7463 NETLINK_CB(skb).portid);
7464 if (IS_ERR(table)) {
7465 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7466 return PTR_ERR(table);
7469 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7470 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7473 if (err != -ENOENT) {
7474 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7478 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7479 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7482 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7485 type = __nft_obj_type_get(objtype);
7486 if (WARN_ON_ONCE(!type))
7489 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7491 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7494 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7496 if (!nft_use_inc(&table->use))
7499 type = nft_obj_type_get(net, objtype);
7501 err = PTR_ERR(type);
7505 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7510 obj->key.table = table;
7511 obj->handle = nf_tables_alloc_handle(table);
7513 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7514 if (!obj->key.name) {
7519 if (nla[NFTA_OBJ_USERDATA]) {
7520 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7521 if (obj->udata == NULL)
7524 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7527 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7531 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7532 nft_objname_ht_params);
7536 list_add_tail_rcu(&obj->list, &table->objects);
7540 /* queued in transaction log */
7541 INIT_LIST_HEAD(&obj->list);
7546 kfree(obj->key.name);
7548 if (obj->ops->destroy)
7549 obj->ops->destroy(&ctx, obj);
7552 module_put(type->owner);
7554 nft_use_dec_restore(&table->use);
7559 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7560 u32 portid, u32 seq, int event, u32 flags,
7561 int family, const struct nft_table *table,
7562 struct nft_object *obj, bool reset)
7564 struct nlmsghdr *nlh;
7566 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7567 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7568 NFNETLINK_V0, nft_base_seq(net));
7570 goto nla_put_failure;
7572 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7573 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7574 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7576 goto nla_put_failure;
7578 if (event == NFT_MSG_DELOBJ) {
7579 nlmsg_end(skb, nlh);
7583 if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7584 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7585 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7586 goto nla_put_failure;
7589 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7590 goto nla_put_failure;
7592 nlmsg_end(skb, nlh);
7596 nlmsg_trim(skb, nlh);
7600 struct nft_obj_filter {
7605 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7607 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7608 const struct nft_table *table;
7609 unsigned int idx = 0, s_idx = cb->args[0];
7610 struct nft_obj_filter *filter = cb->data;
7611 struct net *net = sock_net(skb->sk);
7612 int family = nfmsg->nfgen_family;
7613 struct nftables_pernet *nft_net;
7614 struct nft_object *obj;
7617 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7621 nft_net = nft_pernet(net);
7622 cb->seq = READ_ONCE(nft_net->base_seq);
7624 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7625 if (family != NFPROTO_UNSPEC && family != table->family)
7628 list_for_each_entry_rcu(obj, &table->objects, list) {
7629 if (!nft_is_active(net, obj))
7634 memset(&cb->args[1], 0,
7635 sizeof(cb->args) - sizeof(cb->args[0]));
7636 if (filter && filter->table &&
7637 strcmp(filter->table, table->name))
7640 filter->type != NFT_OBJECT_UNSPEC &&
7641 obj->ops->type->type != filter->type)
7644 char *buf = kasprintf(GFP_ATOMIC,
7649 audit_log_nfcfg(buf,
7652 AUDIT_NFT_OP_OBJ_RESET,
7657 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7660 NLM_F_MULTI | NLM_F_APPEND,
7661 table->family, table,
7665 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7677 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7679 const struct nlattr * const *nla = cb->data;
7680 struct nft_obj_filter *filter = NULL;
7682 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7683 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7687 if (nla[NFTA_OBJ_TABLE]) {
7688 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7689 if (!filter->table) {
7695 if (nla[NFTA_OBJ_TYPE])
7696 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7703 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7705 struct nft_obj_filter *filter = cb->data;
7708 kfree(filter->table);
7715 /* called with rcu_read_lock held */
7716 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7717 const struct nlattr * const nla[])
7719 struct netlink_ext_ack *extack = info->extack;
7720 u8 genmask = nft_genmask_cur(info->net);
7721 u8 family = info->nfmsg->nfgen_family;
7722 const struct nft_table *table;
7723 struct net *net = info->net;
7724 struct nft_object *obj;
7725 struct sk_buff *skb2;
7730 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7731 struct netlink_dump_control c = {
7732 .start = nf_tables_dump_obj_start,
7733 .dump = nf_tables_dump_obj,
7734 .done = nf_tables_dump_obj_done,
7735 .module = THIS_MODULE,
7736 .data = (void *)nla,
7739 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7742 if (!nla[NFTA_OBJ_NAME] ||
7743 !nla[NFTA_OBJ_TYPE])
7746 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7747 if (IS_ERR(table)) {
7748 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7749 return PTR_ERR(table);
7752 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7753 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7755 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7756 return PTR_ERR(obj);
7759 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7763 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7767 const struct nftables_pernet *nft_net;
7770 nft_net = nft_pernet(net);
7771 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7773 audit_log_nfcfg(buf,
7776 AUDIT_NFT_OP_OBJ_RESET,
7781 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7782 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7783 family, table, obj, reset);
7785 goto err_fill_obj_info;
7787 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7794 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7796 if (obj->ops->destroy)
7797 obj->ops->destroy(ctx, obj);
7799 module_put(obj->ops->type->owner);
7800 kfree(obj->key.name);
7805 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7806 const struct nlattr * const nla[])
7808 struct netlink_ext_ack *extack = info->extack;
7809 u8 genmask = nft_genmask_next(info->net);
7810 u8 family = info->nfmsg->nfgen_family;
7811 struct net *net = info->net;
7812 const struct nlattr *attr;
7813 struct nft_table *table;
7814 struct nft_object *obj;
7818 if (!nla[NFTA_OBJ_TYPE] ||
7819 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7822 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7823 NETLINK_CB(skb).portid);
7824 if (IS_ERR(table)) {
7825 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7826 return PTR_ERR(table);
7829 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7830 if (nla[NFTA_OBJ_HANDLE]) {
7831 attr = nla[NFTA_OBJ_HANDLE];
7832 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7834 attr = nla[NFTA_OBJ_NAME];
7835 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7839 if (PTR_ERR(obj) == -ENOENT &&
7840 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7843 NL_SET_BAD_ATTR(extack, attr);
7844 return PTR_ERR(obj);
7847 NL_SET_BAD_ATTR(extack, attr);
7851 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7853 return nft_delobj(&ctx, obj);
7856 void nft_obj_notify(struct net *net, const struct nft_table *table,
7857 struct nft_object *obj, u32 portid, u32 seq, int event,
7858 u16 flags, int family, int report, gfp_t gfp)
7860 struct nftables_pernet *nft_net = nft_pernet(net);
7861 struct sk_buff *skb;
7863 char *buf = kasprintf(gfp, "%s:%u",
7864 table->name, nft_net->base_seq);
7866 audit_log_nfcfg(buf,
7869 event == NFT_MSG_NEWOBJ ?
7870 AUDIT_NFT_OP_OBJ_REGISTER :
7871 AUDIT_NFT_OP_OBJ_UNREGISTER,
7876 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7879 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7883 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7884 flags & (NLM_F_CREATE | NLM_F_EXCL),
7885 family, table, obj, false);
7891 nft_notify_enqueue(skb, report, &nft_net->notify_list);
7894 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7896 EXPORT_SYMBOL_GPL(nft_obj_notify);
7898 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7899 struct nft_object *obj, int event)
7901 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7902 ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7908 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7910 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7911 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7912 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7914 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7916 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7918 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7919 list_del_rcu(&type->list);
7920 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7922 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7924 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7925 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
7926 .len = NFT_NAME_MAXLEN - 1 },
7927 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
7928 .len = NFT_NAME_MAXLEN - 1 },
7929 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
7930 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
7931 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
7934 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7935 const struct nlattr *nla, u8 genmask)
7937 struct nft_flowtable *flowtable;
7939 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7940 if (!nla_strcmp(nla, flowtable->name) &&
7941 nft_active_genmask(flowtable, genmask))
7944 return ERR_PTR(-ENOENT);
7946 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7948 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7949 struct nft_flowtable *flowtable,
7950 enum nft_trans_phase phase)
7953 case NFT_TRANS_PREPARE_ERROR:
7954 case NFT_TRANS_PREPARE:
7955 case NFT_TRANS_ABORT:
7956 case NFT_TRANS_RELEASE:
7957 nft_use_dec(&flowtable->use);
7963 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7965 static struct nft_flowtable *
7966 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7967 const struct nlattr *nla, u8 genmask)
7969 struct nft_flowtable *flowtable;
7971 list_for_each_entry(flowtable, &table->flowtables, list) {
7972 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7973 nft_active_genmask(flowtable, genmask))
7976 return ERR_PTR(-ENOENT);
7979 struct nft_flowtable_hook {
7982 struct list_head list;
7985 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7986 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
7987 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
7988 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
7991 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7992 const struct nlattr * const nla[],
7993 struct nft_flowtable_hook *flowtable_hook,
7994 struct nft_flowtable *flowtable,
7995 struct netlink_ext_ack *extack, bool add)
7997 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7998 struct nft_hook *hook;
7999 int hooknum, priority;
8002 INIT_LIST_HEAD(&flowtable_hook->list);
8004 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
8005 nla[NFTA_FLOWTABLE_HOOK],
8006 nft_flowtable_hook_policy, NULL);
8011 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
8012 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8013 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8017 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8018 if (hooknum != NF_NETDEV_INGRESS)
8021 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8023 flowtable_hook->priority = priority;
8024 flowtable_hook->num = hooknum;
8026 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8027 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8028 if (hooknum != flowtable->hooknum)
8032 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8033 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8034 if (priority != flowtable->data.priority)
8038 flowtable_hook->priority = flowtable->data.priority;
8039 flowtable_hook->num = flowtable->hooknum;
8042 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8043 err = nf_tables_parse_netdev_hooks(ctx->net,
8044 tb[NFTA_FLOWTABLE_HOOK_DEVS],
8045 &flowtable_hook->list,
8051 list_for_each_entry(hook, &flowtable_hook->list, list) {
8052 hook->ops.pf = NFPROTO_NETDEV;
8053 hook->ops.hooknum = flowtable_hook->num;
8054 hook->ops.priority = flowtable_hook->priority;
8055 hook->ops.priv = &flowtable->data;
8056 hook->ops.hook = flowtable->data.type->hook;
8062 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8064 const struct nf_flowtable_type *type;
8066 list_for_each_entry(type, &nf_tables_flowtables, list) {
8067 if (family == type->family)
8073 static const struct nf_flowtable_type *
8074 nft_flowtable_type_get(struct net *net, u8 family)
8076 const struct nf_flowtable_type *type;
8078 type = __nft_flowtable_type_get(family);
8079 if (type != NULL && try_module_get(type->owner))
8082 lockdep_nfnl_nft_mutex_not_held();
8083 #ifdef CONFIG_MODULES
8085 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8086 return ERR_PTR(-EAGAIN);
8089 return ERR_PTR(-ENOENT);
8092 /* Only called from error and netdev event paths. */
8093 static void nft_unregister_flowtable_hook(struct net *net,
8094 struct nft_flowtable *flowtable,
8095 struct nft_hook *hook)
8097 nf_unregister_net_hook(net, &hook->ops);
8098 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8102 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8103 struct list_head *hook_list,
8104 bool release_netdev)
8106 struct nft_hook *hook, *next;
8108 list_for_each_entry_safe(hook, next, hook_list, list) {
8109 nf_unregister_net_hook(net, &hook->ops);
8110 if (release_netdev) {
8111 list_del(&hook->list);
8112 kfree_rcu(hook, rcu);
8117 static void nft_unregister_flowtable_net_hooks(struct net *net,
8118 struct list_head *hook_list)
8120 __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8123 static int nft_register_flowtable_net_hooks(struct net *net,
8124 struct nft_table *table,
8125 struct list_head *hook_list,
8126 struct nft_flowtable *flowtable)
8128 struct nft_hook *hook, *hook2, *next;
8129 struct nft_flowtable *ft;
8132 list_for_each_entry(hook, hook_list, list) {
8133 list_for_each_entry(ft, &table->flowtables, list) {
8134 if (!nft_is_active_next(net, ft))
8137 list_for_each_entry(hook2, &ft->hook_list, list) {
8138 if (hook->ops.dev == hook2->ops.dev &&
8139 hook->ops.pf == hook2->ops.pf) {
8141 goto err_unregister_net_hooks;
8146 err = flowtable->data.type->setup(&flowtable->data,
8150 goto err_unregister_net_hooks;
8152 err = nf_register_net_hook(net, &hook->ops);
8154 flowtable->data.type->setup(&flowtable->data,
8157 goto err_unregister_net_hooks;
8165 err_unregister_net_hooks:
8166 list_for_each_entry_safe(hook, next, hook_list, list) {
8170 nft_unregister_flowtable_hook(net, flowtable, hook);
8171 list_del_rcu(&hook->list);
8172 kfree_rcu(hook, rcu);
8178 static void nft_hooks_destroy(struct list_head *hook_list)
8180 struct nft_hook *hook, *next;
8182 list_for_each_entry_safe(hook, next, hook_list, list) {
8183 list_del_rcu(&hook->list);
8184 kfree_rcu(hook, rcu);
8188 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8189 struct nft_flowtable *flowtable,
8190 struct netlink_ext_ack *extack)
8192 const struct nlattr * const *nla = ctx->nla;
8193 struct nft_flowtable_hook flowtable_hook;
8194 struct nft_hook *hook, *next;
8195 struct nft_trans *trans;
8196 bool unregister = false;
8200 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8205 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8206 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8207 list_del(&hook->list);
8212 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8213 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8214 if (flags & ~NFT_FLOWTABLE_MASK) {
8216 goto err_flowtable_update_hook;
8218 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8219 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8221 goto err_flowtable_update_hook;
8224 flags = flowtable->data.flags;
8227 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8228 &flowtable_hook.list, flowtable);
8230 goto err_flowtable_update_hook;
8232 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8233 sizeof(struct nft_trans_flowtable));
8237 goto err_flowtable_update_hook;
8240 nft_trans_flowtable_flags(trans) = flags;
8241 nft_trans_flowtable(trans) = flowtable;
8242 nft_trans_flowtable_update(trans) = true;
8243 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8244 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8246 nft_trans_commit_list_add_tail(ctx->net, trans);
8250 err_flowtable_update_hook:
8251 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8253 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8254 list_del_rcu(&hook->list);
8255 kfree_rcu(hook, rcu);
8262 static int nf_tables_newflowtable(struct sk_buff *skb,
8263 const struct nfnl_info *info,
8264 const struct nlattr * const nla[])
8266 struct netlink_ext_ack *extack = info->extack;
8267 struct nft_flowtable_hook flowtable_hook;
8268 u8 genmask = nft_genmask_next(info->net);
8269 u8 family = info->nfmsg->nfgen_family;
8270 const struct nf_flowtable_type *type;
8271 struct nft_flowtable *flowtable;
8272 struct nft_hook *hook, *next;
8273 struct net *net = info->net;
8274 struct nft_table *table;
8278 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8279 !nla[NFTA_FLOWTABLE_NAME] ||
8280 !nla[NFTA_FLOWTABLE_HOOK])
8283 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8284 genmask, NETLINK_CB(skb).portid);
8285 if (IS_ERR(table)) {
8286 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8287 return PTR_ERR(table);
8290 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8292 if (IS_ERR(flowtable)) {
8293 err = PTR_ERR(flowtable);
8294 if (err != -ENOENT) {
8295 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8299 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8300 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8304 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8306 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8309 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8311 if (!nft_use_inc(&table->use))
8314 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8317 goto flowtable_alloc;
8320 flowtable->table = table;
8321 flowtable->handle = nf_tables_alloc_handle(table);
8322 INIT_LIST_HEAD(&flowtable->hook_list);
8324 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8325 if (!flowtable->name) {
8330 type = nft_flowtable_type_get(net, family);
8332 err = PTR_ERR(type);
8336 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8337 flowtable->data.flags =
8338 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8339 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8345 write_pnet(&flowtable->data.net, net);
8346 flowtable->data.type = type;
8347 err = type->init(&flowtable->data);
8351 err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8356 list_splice(&flowtable_hook.list, &flowtable->hook_list);
8357 flowtable->data.priority = flowtable_hook.priority;
8358 flowtable->hooknum = flowtable_hook.num;
8360 err = nft_register_flowtable_net_hooks(ctx.net, table,
8361 &flowtable->hook_list,
8364 nft_hooks_destroy(&flowtable->hook_list);
8368 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8372 list_add_tail_rcu(&flowtable->list, &table->flowtables);
8376 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8377 nft_unregister_flowtable_hook(net, flowtable, hook);
8378 list_del_rcu(&hook->list);
8379 kfree_rcu(hook, rcu);
8382 flowtable->data.type->free(&flowtable->data);
8384 module_put(type->owner);
8386 kfree(flowtable->name);
8390 nft_use_dec_restore(&table->use);
8395 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8397 struct nft_hook *this, *next;
8399 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8400 list_del(&this->list);
8405 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8406 struct nft_flowtable *flowtable,
8407 struct netlink_ext_ack *extack)
8409 const struct nlattr * const *nla = ctx->nla;
8410 struct nft_flowtable_hook flowtable_hook;
8411 LIST_HEAD(flowtable_del_list);
8412 struct nft_hook *this, *hook;
8413 struct nft_trans *trans;
8416 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8421 list_for_each_entry(this, &flowtable_hook.list, list) {
8422 hook = nft_hook_list_find(&flowtable->hook_list, this);
8425 goto err_flowtable_del_hook;
8427 list_move(&hook->list, &flowtable_del_list);
8430 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8431 sizeof(struct nft_trans_flowtable));
8434 goto err_flowtable_del_hook;
8437 nft_trans_flowtable(trans) = flowtable;
8438 nft_trans_flowtable_update(trans) = true;
8439 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8440 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8441 nft_flowtable_hook_release(&flowtable_hook);
8443 nft_trans_commit_list_add_tail(ctx->net, trans);
8447 err_flowtable_del_hook:
8448 list_splice(&flowtable_del_list, &flowtable->hook_list);
8449 nft_flowtable_hook_release(&flowtable_hook);
8454 static int nf_tables_delflowtable(struct sk_buff *skb,
8455 const struct nfnl_info *info,
8456 const struct nlattr * const nla[])
8458 struct netlink_ext_ack *extack = info->extack;
8459 u8 genmask = nft_genmask_next(info->net);
8460 u8 family = info->nfmsg->nfgen_family;
8461 struct nft_flowtable *flowtable;
8462 struct net *net = info->net;
8463 const struct nlattr *attr;
8464 struct nft_table *table;
8467 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8468 (!nla[NFTA_FLOWTABLE_NAME] &&
8469 !nla[NFTA_FLOWTABLE_HANDLE]))
8472 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8473 genmask, NETLINK_CB(skb).portid);
8474 if (IS_ERR(table)) {
8475 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8476 return PTR_ERR(table);
8479 if (nla[NFTA_FLOWTABLE_HANDLE]) {
8480 attr = nla[NFTA_FLOWTABLE_HANDLE];
8481 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8483 attr = nla[NFTA_FLOWTABLE_NAME];
8484 flowtable = nft_flowtable_lookup(table, attr, genmask);
8487 if (IS_ERR(flowtable)) {
8488 if (PTR_ERR(flowtable) == -ENOENT &&
8489 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8492 NL_SET_BAD_ATTR(extack, attr);
8493 return PTR_ERR(flowtable);
8496 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8498 if (nla[NFTA_FLOWTABLE_HOOK])
8499 return nft_delflowtable_hook(&ctx, flowtable, extack);
8501 if (flowtable->use > 0) {
8502 NL_SET_BAD_ATTR(extack, attr);
8506 return nft_delflowtable(&ctx, flowtable);
8509 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8510 u32 portid, u32 seq, int event,
8511 u32 flags, int family,
8512 struct nft_flowtable *flowtable,
8513 struct list_head *hook_list)
8515 struct nlattr *nest, *nest_devs;
8516 struct nft_hook *hook;
8517 struct nlmsghdr *nlh;
8519 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8520 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8521 NFNETLINK_V0, nft_base_seq(net));
8523 goto nla_put_failure;
8525 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8526 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8527 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8528 NFTA_FLOWTABLE_PAD))
8529 goto nla_put_failure;
8531 if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8532 nlmsg_end(skb, nlh);
8536 if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8537 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8538 goto nla_put_failure;
8540 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8542 goto nla_put_failure;
8543 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8544 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8545 goto nla_put_failure;
8547 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8549 goto nla_put_failure;
8552 hook_list = &flowtable->hook_list;
8554 list_for_each_entry_rcu(hook, hook_list, list) {
8555 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8556 goto nla_put_failure;
8558 nla_nest_end(skb, nest_devs);
8559 nla_nest_end(skb, nest);
8561 nlmsg_end(skb, nlh);
8565 nlmsg_trim(skb, nlh);
8569 struct nft_flowtable_filter {
8573 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8574 struct netlink_callback *cb)
8576 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8577 struct nft_flowtable_filter *filter = cb->data;
8578 unsigned int idx = 0, s_idx = cb->args[0];
8579 struct net *net = sock_net(skb->sk);
8580 int family = nfmsg->nfgen_family;
8581 struct nft_flowtable *flowtable;
8582 struct nftables_pernet *nft_net;
8583 const struct nft_table *table;
8586 nft_net = nft_pernet(net);
8587 cb->seq = READ_ONCE(nft_net->base_seq);
8589 list_for_each_entry_rcu(table, &nft_net->tables, list) {
8590 if (family != NFPROTO_UNSPEC && family != table->family)
8593 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8594 if (!nft_is_active(net, flowtable))
8599 memset(&cb->args[1], 0,
8600 sizeof(cb->args) - sizeof(cb->args[0]));
8601 if (filter && filter->table &&
8602 strcmp(filter->table, table->name))
8605 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8607 NFT_MSG_NEWFLOWTABLE,
8608 NLM_F_MULTI | NLM_F_APPEND,
8610 flowtable, NULL) < 0)
8613 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8625 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8627 const struct nlattr * const *nla = cb->data;
8628 struct nft_flowtable_filter *filter = NULL;
8630 if (nla[NFTA_FLOWTABLE_TABLE]) {
8631 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8635 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8637 if (!filter->table) {
8647 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8649 struct nft_flowtable_filter *filter = cb->data;
8654 kfree(filter->table);
8660 /* called with rcu_read_lock held */
8661 static int nf_tables_getflowtable(struct sk_buff *skb,
8662 const struct nfnl_info *info,
8663 const struct nlattr * const nla[])
8665 u8 genmask = nft_genmask_cur(info->net);
8666 u8 family = info->nfmsg->nfgen_family;
8667 struct nft_flowtable *flowtable;
8668 const struct nft_table *table;
8669 struct net *net = info->net;
8670 struct sk_buff *skb2;
8673 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8674 struct netlink_dump_control c = {
8675 .start = nf_tables_dump_flowtable_start,
8676 .dump = nf_tables_dump_flowtable,
8677 .done = nf_tables_dump_flowtable_done,
8678 .module = THIS_MODULE,
8679 .data = (void *)nla,
8682 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8685 if (!nla[NFTA_FLOWTABLE_NAME])
8688 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8691 return PTR_ERR(table);
8693 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8695 if (IS_ERR(flowtable))
8696 return PTR_ERR(flowtable);
8698 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8702 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8703 info->nlh->nlmsg_seq,
8704 NFT_MSG_NEWFLOWTABLE, 0, family,
8707 goto err_fill_flowtable_info;
8709 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8711 err_fill_flowtable_info:
8716 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8717 struct nft_flowtable *flowtable,
8718 struct list_head *hook_list, int event)
8720 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8721 struct sk_buff *skb;
8726 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8729 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8733 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8734 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8736 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8737 ctx->seq, event, flags,
8738 ctx->family, flowtable, hook_list);
8744 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8747 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8750 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8752 struct nft_hook *hook, *next;
8754 flowtable->data.type->free(&flowtable->data);
8755 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8756 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8758 list_del_rcu(&hook->list);
8761 kfree(flowtable->name);
8762 module_put(flowtable->data.type->owner);
8766 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8767 u32 portid, u32 seq)
8769 struct nftables_pernet *nft_net = nft_pernet(net);
8770 struct nlmsghdr *nlh;
8771 char buf[TASK_COMM_LEN];
8772 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8774 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8775 NFNETLINK_V0, nft_base_seq(net));
8777 goto nla_put_failure;
8779 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8780 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8781 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8782 goto nla_put_failure;
8784 nlmsg_end(skb, nlh);
8788 nlmsg_trim(skb, nlh);
8792 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8793 struct nft_flowtable *flowtable)
8795 struct nft_hook *hook;
8797 list_for_each_entry(hook, &flowtable->hook_list, list) {
8798 if (hook->ops.dev != dev)
8801 /* flow_offload_netdev_event() cleans up entries for us. */
8802 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8803 list_del_rcu(&hook->list);
8804 kfree_rcu(hook, rcu);
8809 static int nf_tables_flowtable_event(struct notifier_block *this,
8810 unsigned long event, void *ptr)
8812 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8813 struct nft_flowtable *flowtable;
8814 struct nftables_pernet *nft_net;
8815 struct nft_table *table;
8818 if (event != NETDEV_UNREGISTER)
8822 nft_net = nft_pernet(net);
8823 mutex_lock(&nft_net->commit_mutex);
8824 list_for_each_entry(table, &nft_net->tables, list) {
8825 list_for_each_entry(flowtable, &table->flowtables, list) {
8826 nft_flowtable_event(event, dev, flowtable);
8829 mutex_unlock(&nft_net->commit_mutex);
8834 static struct notifier_block nf_tables_flowtable_notifier = {
8835 .notifier_call = nf_tables_flowtable_event,
8838 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8841 struct nlmsghdr *nlh = nlmsg_hdr(skb);
8842 struct sk_buff *skb2;
8845 if (!nlmsg_report(nlh) &&
8846 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8849 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8853 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8860 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8861 nlmsg_report(nlh), GFP_KERNEL);
8864 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8868 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8869 const struct nlattr * const nla[])
8871 struct sk_buff *skb2;
8874 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8878 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8879 info->nlh->nlmsg_seq);
8881 goto err_fill_gen_info;
8883 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8890 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8891 [NFT_MSG_NEWTABLE] = {
8892 .call = nf_tables_newtable,
8893 .type = NFNL_CB_BATCH,
8894 .attr_count = NFTA_TABLE_MAX,
8895 .policy = nft_table_policy,
8897 [NFT_MSG_GETTABLE] = {
8898 .call = nf_tables_gettable,
8899 .type = NFNL_CB_RCU,
8900 .attr_count = NFTA_TABLE_MAX,
8901 .policy = nft_table_policy,
8903 [NFT_MSG_DELTABLE] = {
8904 .call = nf_tables_deltable,
8905 .type = NFNL_CB_BATCH,
8906 .attr_count = NFTA_TABLE_MAX,
8907 .policy = nft_table_policy,
8909 [NFT_MSG_DESTROYTABLE] = {
8910 .call = nf_tables_deltable,
8911 .type = NFNL_CB_BATCH,
8912 .attr_count = NFTA_TABLE_MAX,
8913 .policy = nft_table_policy,
8915 [NFT_MSG_NEWCHAIN] = {
8916 .call = nf_tables_newchain,
8917 .type = NFNL_CB_BATCH,
8918 .attr_count = NFTA_CHAIN_MAX,
8919 .policy = nft_chain_policy,
8921 [NFT_MSG_GETCHAIN] = {
8922 .call = nf_tables_getchain,
8923 .type = NFNL_CB_RCU,
8924 .attr_count = NFTA_CHAIN_MAX,
8925 .policy = nft_chain_policy,
8927 [NFT_MSG_DELCHAIN] = {
8928 .call = nf_tables_delchain,
8929 .type = NFNL_CB_BATCH,
8930 .attr_count = NFTA_CHAIN_MAX,
8931 .policy = nft_chain_policy,
8933 [NFT_MSG_DESTROYCHAIN] = {
8934 .call = nf_tables_delchain,
8935 .type = NFNL_CB_BATCH,
8936 .attr_count = NFTA_CHAIN_MAX,
8937 .policy = nft_chain_policy,
8939 [NFT_MSG_NEWRULE] = {
8940 .call = nf_tables_newrule,
8941 .type = NFNL_CB_BATCH,
8942 .attr_count = NFTA_RULE_MAX,
8943 .policy = nft_rule_policy,
8945 [NFT_MSG_GETRULE] = {
8946 .call = nf_tables_getrule,
8947 .type = NFNL_CB_RCU,
8948 .attr_count = NFTA_RULE_MAX,
8949 .policy = nft_rule_policy,
8951 [NFT_MSG_GETRULE_RESET] = {
8952 .call = nf_tables_getrule,
8953 .type = NFNL_CB_RCU,
8954 .attr_count = NFTA_RULE_MAX,
8955 .policy = nft_rule_policy,
8957 [NFT_MSG_DELRULE] = {
8958 .call = nf_tables_delrule,
8959 .type = NFNL_CB_BATCH,
8960 .attr_count = NFTA_RULE_MAX,
8961 .policy = nft_rule_policy,
8963 [NFT_MSG_DESTROYRULE] = {
8964 .call = nf_tables_delrule,
8965 .type = NFNL_CB_BATCH,
8966 .attr_count = NFTA_RULE_MAX,
8967 .policy = nft_rule_policy,
8969 [NFT_MSG_NEWSET] = {
8970 .call = nf_tables_newset,
8971 .type = NFNL_CB_BATCH,
8972 .attr_count = NFTA_SET_MAX,
8973 .policy = nft_set_policy,
8975 [NFT_MSG_GETSET] = {
8976 .call = nf_tables_getset,
8977 .type = NFNL_CB_RCU,
8978 .attr_count = NFTA_SET_MAX,
8979 .policy = nft_set_policy,
8981 [NFT_MSG_DELSET] = {
8982 .call = nf_tables_delset,
8983 .type = NFNL_CB_BATCH,
8984 .attr_count = NFTA_SET_MAX,
8985 .policy = nft_set_policy,
8987 [NFT_MSG_DESTROYSET] = {
8988 .call = nf_tables_delset,
8989 .type = NFNL_CB_BATCH,
8990 .attr_count = NFTA_SET_MAX,
8991 .policy = nft_set_policy,
8993 [NFT_MSG_NEWSETELEM] = {
8994 .call = nf_tables_newsetelem,
8995 .type = NFNL_CB_BATCH,
8996 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8997 .policy = nft_set_elem_list_policy,
8999 [NFT_MSG_GETSETELEM] = {
9000 .call = nf_tables_getsetelem,
9001 .type = NFNL_CB_RCU,
9002 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9003 .policy = nft_set_elem_list_policy,
9005 [NFT_MSG_GETSETELEM_RESET] = {
9006 .call = nf_tables_getsetelem,
9007 .type = NFNL_CB_RCU,
9008 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9009 .policy = nft_set_elem_list_policy,
9011 [NFT_MSG_DELSETELEM] = {
9012 .call = nf_tables_delsetelem,
9013 .type = NFNL_CB_BATCH,
9014 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9015 .policy = nft_set_elem_list_policy,
9017 [NFT_MSG_DESTROYSETELEM] = {
9018 .call = nf_tables_delsetelem,
9019 .type = NFNL_CB_BATCH,
9020 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9021 .policy = nft_set_elem_list_policy,
9023 [NFT_MSG_GETGEN] = {
9024 .call = nf_tables_getgen,
9025 .type = NFNL_CB_RCU,
9027 [NFT_MSG_NEWOBJ] = {
9028 .call = nf_tables_newobj,
9029 .type = NFNL_CB_BATCH,
9030 .attr_count = NFTA_OBJ_MAX,
9031 .policy = nft_obj_policy,
9033 [NFT_MSG_GETOBJ] = {
9034 .call = nf_tables_getobj,
9035 .type = NFNL_CB_RCU,
9036 .attr_count = NFTA_OBJ_MAX,
9037 .policy = nft_obj_policy,
9039 [NFT_MSG_DELOBJ] = {
9040 .call = nf_tables_delobj,
9041 .type = NFNL_CB_BATCH,
9042 .attr_count = NFTA_OBJ_MAX,
9043 .policy = nft_obj_policy,
9045 [NFT_MSG_DESTROYOBJ] = {
9046 .call = nf_tables_delobj,
9047 .type = NFNL_CB_BATCH,
9048 .attr_count = NFTA_OBJ_MAX,
9049 .policy = nft_obj_policy,
9051 [NFT_MSG_GETOBJ_RESET] = {
9052 .call = nf_tables_getobj,
9053 .type = NFNL_CB_RCU,
9054 .attr_count = NFTA_OBJ_MAX,
9055 .policy = nft_obj_policy,
9057 [NFT_MSG_NEWFLOWTABLE] = {
9058 .call = nf_tables_newflowtable,
9059 .type = NFNL_CB_BATCH,
9060 .attr_count = NFTA_FLOWTABLE_MAX,
9061 .policy = nft_flowtable_policy,
9063 [NFT_MSG_GETFLOWTABLE] = {
9064 .call = nf_tables_getflowtable,
9065 .type = NFNL_CB_RCU,
9066 .attr_count = NFTA_FLOWTABLE_MAX,
9067 .policy = nft_flowtable_policy,
9069 [NFT_MSG_DELFLOWTABLE] = {
9070 .call = nf_tables_delflowtable,
9071 .type = NFNL_CB_BATCH,
9072 .attr_count = NFTA_FLOWTABLE_MAX,
9073 .policy = nft_flowtable_policy,
9075 [NFT_MSG_DESTROYFLOWTABLE] = {
9076 .call = nf_tables_delflowtable,
9077 .type = NFNL_CB_BATCH,
9078 .attr_count = NFTA_FLOWTABLE_MAX,
9079 .policy = nft_flowtable_policy,
9083 static int nf_tables_validate(struct net *net)
9085 struct nftables_pernet *nft_net = nft_pernet(net);
9086 struct nft_table *table;
9088 list_for_each_entry(table, &nft_net->tables, list) {
9089 switch (table->validate_state) {
9090 case NFT_VALIDATE_SKIP:
9092 case NFT_VALIDATE_NEED:
9093 nft_validate_state_update(table, NFT_VALIDATE_DO);
9095 case NFT_VALIDATE_DO:
9096 if (nft_table_validate(net, table) < 0)
9099 nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9107 /* a drop policy has to be deferred until all rules have been activated,
9108 * otherwise a large ruleset that contains a drop-policy base chain will
9109 * cause all packets to get dropped until the full transaction has been
9112 * We defer the drop policy until the transaction has been finalized.
9114 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9116 struct nft_base_chain *basechain;
9118 if (nft_trans_chain_policy(trans) != NF_DROP)
9121 if (!nft_is_base_chain(trans->ctx.chain))
9124 basechain = nft_base_chain(trans->ctx.chain);
9125 basechain->policy = NF_DROP;
9128 static void nft_chain_commit_update(struct nft_trans *trans)
9130 struct nft_base_chain *basechain;
9132 if (nft_trans_chain_name(trans)) {
9133 rhltable_remove(&trans->ctx.table->chains_ht,
9134 &trans->ctx.chain->rhlhead,
9135 nft_chain_ht_params);
9136 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9137 rhltable_insert_key(&trans->ctx.table->chains_ht,
9138 trans->ctx.chain->name,
9139 &trans->ctx.chain->rhlhead,
9140 nft_chain_ht_params);
9143 if (!nft_is_base_chain(trans->ctx.chain))
9146 nft_chain_stats_replace(trans);
9148 basechain = nft_base_chain(trans->ctx.chain);
9150 switch (nft_trans_chain_policy(trans)) {
9153 basechain->policy = nft_trans_chain_policy(trans);
9158 static void nft_obj_commit_update(struct nft_trans *trans)
9160 struct nft_object *newobj;
9161 struct nft_object *obj;
9163 obj = nft_trans_obj(trans);
9164 newobj = nft_trans_obj_newobj(trans);
9166 if (obj->ops->update)
9167 obj->ops->update(obj, newobj);
9169 nft_obj_destroy(&trans->ctx, newobj);
9172 static void nft_commit_release(struct nft_trans *trans)
9174 switch (trans->msg_type) {
9175 case NFT_MSG_DELTABLE:
9176 case NFT_MSG_DESTROYTABLE:
9177 nf_tables_table_destroy(&trans->ctx);
9179 case NFT_MSG_NEWCHAIN:
9180 free_percpu(nft_trans_chain_stats(trans));
9181 kfree(nft_trans_chain_name(trans));
9183 case NFT_MSG_DELCHAIN:
9184 case NFT_MSG_DESTROYCHAIN:
9185 if (nft_trans_chain_update(trans))
9186 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9188 nf_tables_chain_destroy(&trans->ctx);
9190 case NFT_MSG_DELRULE:
9191 case NFT_MSG_DESTROYRULE:
9192 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9194 case NFT_MSG_DELSET:
9195 case NFT_MSG_DESTROYSET:
9196 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9198 case NFT_MSG_DELSETELEM:
9199 case NFT_MSG_DESTROYSETELEM:
9200 nf_tables_set_elem_destroy(&trans->ctx,
9201 nft_trans_elem_set(trans),
9202 nft_trans_elem(trans).priv);
9204 case NFT_MSG_DELOBJ:
9205 case NFT_MSG_DESTROYOBJ:
9206 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9208 case NFT_MSG_DELFLOWTABLE:
9209 case NFT_MSG_DESTROYFLOWTABLE:
9210 if (nft_trans_flowtable_update(trans))
9211 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9213 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9218 put_net(trans->ctx.net);
9223 static void nf_tables_trans_destroy_work(struct work_struct *w)
9225 struct nft_trans *trans, *next;
9228 spin_lock(&nf_tables_destroy_list_lock);
9229 list_splice_init(&nf_tables_destroy_list, &head);
9230 spin_unlock(&nf_tables_destroy_list_lock);
9232 if (list_empty(&head))
9237 list_for_each_entry_safe(trans, next, &head, list) {
9238 nft_trans_list_del(trans);
9239 nft_commit_release(trans);
9243 void nf_tables_trans_destroy_flush_work(void)
9245 flush_work(&trans_destroy_work);
9247 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9249 static bool nft_expr_reduce(struct nft_regs_track *track,
9250 const struct nft_expr *expr)
9255 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9257 const struct nft_expr *expr, *last;
9258 struct nft_regs_track track = {};
9259 unsigned int size, data_size;
9260 void *data, *data_boundary;
9261 struct nft_rule_dp *prule;
9262 struct nft_rule *rule;
9264 /* already handled or inactive chain? */
9265 if (chain->blob_next || !nft_is_active_next(net, chain))
9269 list_for_each_entry(rule, &chain->rules, list) {
9270 if (nft_is_active_next(net, rule)) {
9271 data_size += sizeof(*prule) + rule->dlen;
9272 if (data_size > INT_MAX)
9277 chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9278 if (!chain->blob_next)
9281 data = (void *)chain->blob_next->data;
9282 data_boundary = data + data_size;
9285 list_for_each_entry(rule, &chain->rules, list) {
9286 if (!nft_is_active_next(net, rule))
9289 prule = (struct nft_rule_dp *)data;
9290 data += offsetof(struct nft_rule_dp, data);
9291 if (WARN_ON_ONCE(data > data_boundary))
9295 track.last = nft_expr_last(rule);
9296 nft_rule_for_each_expr(expr, last, rule) {
9299 if (nft_expr_reduce(&track, expr)) {
9304 if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9307 memcpy(data + size, expr, expr->ops->size);
9308 size += expr->ops->size;
9310 if (WARN_ON_ONCE(size >= 1 << 12))
9313 prule->handle = rule->handle;
9319 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9322 if (WARN_ON_ONCE(data > data_boundary))
9325 prule = (struct nft_rule_dp *)data;
9326 nft_last_rule(chain, prule);
9331 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9333 struct nftables_pernet *nft_net = nft_pernet(net);
9334 struct nft_trans *trans, *next;
9336 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9337 struct nft_chain *chain = trans->ctx.chain;
9339 if (trans->msg_type == NFT_MSG_NEWRULE ||
9340 trans->msg_type == NFT_MSG_DELRULE) {
9341 kvfree(chain->blob_next);
9342 chain->blob_next = NULL;
9347 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9349 struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9354 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9356 struct nft_rule_dp_last *last;
9358 /* last rule trailer is after end marker */
9359 last = (void *)blob + sizeof(*blob) + blob->size;
9362 call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9365 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9367 struct nft_rule_blob *g0, *g1;
9370 next_genbit = nft_gencursor_next(net);
9372 g0 = rcu_dereference_protected(chain->blob_gen_0,
9373 lockdep_commit_lock_is_held(net));
9374 g1 = rcu_dereference_protected(chain->blob_gen_1,
9375 lockdep_commit_lock_is_held(net));
9377 /* No changes to this chain? */
9378 if (chain->blob_next == NULL) {
9379 /* chain had no change in last or next generation */
9383 * chain had no change in this generation; make sure next
9384 * one uses same rules as current generation.
9387 rcu_assign_pointer(chain->blob_gen_1, g0);
9388 nf_tables_commit_chain_free_rules_old(g1);
9390 rcu_assign_pointer(chain->blob_gen_0, g1);
9391 nf_tables_commit_chain_free_rules_old(g0);
9398 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9400 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9402 chain->blob_next = NULL;
9408 nf_tables_commit_chain_free_rules_old(g1);
9410 nf_tables_commit_chain_free_rules_old(g0);
9413 static void nft_obj_del(struct nft_object *obj)
9415 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9416 list_del_rcu(&obj->list);
9419 void nft_chain_del(struct nft_chain *chain)
9421 struct nft_table *table = chain->table;
9423 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9424 nft_chain_ht_params));
9425 list_del_rcu(&chain->list);
9428 static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
9429 struct nft_trans_gc *trans)
9431 void **priv = trans->priv;
9434 for (i = 0; i < trans->count; i++) {
9435 struct nft_set_elem elem = {
9439 nft_setelem_data_deactivate(ctx->net, trans->set, &elem);
9440 nft_setelem_remove(ctx->net, trans->set, &elem);
9444 void nft_trans_gc_destroy(struct nft_trans_gc *trans)
9446 nft_set_put(trans->set);
9447 put_net(trans->net);
9451 static void nft_trans_gc_trans_free(struct rcu_head *rcu)
9453 struct nft_set_elem elem = {};
9454 struct nft_trans_gc *trans;
9455 struct nft_ctx ctx = {};
9458 trans = container_of(rcu, struct nft_trans_gc, rcu);
9459 ctx.net = read_pnet(&trans->set->net);
9461 for (i = 0; i < trans->count; i++) {
9462 elem.priv = trans->priv[i];
9463 if (!nft_setelem_is_catchall(trans->set, &elem))
9464 atomic_dec(&trans->set->nelems);
9466 nf_tables_set_elem_destroy(&ctx, trans->set, elem.priv);
9469 nft_trans_gc_destroy(trans);
9472 static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
9474 struct nftables_pernet *nft_net;
9475 struct nft_ctx ctx = {};
9477 nft_net = nft_pernet(trans->net);
9479 mutex_lock(&nft_net->commit_mutex);
9481 /* Check for race with transaction, otherwise this batch refers to
9482 * stale objects that might not be there anymore. Skip transaction if
9483 * set has been destroyed from control plane transaction in case gc
9484 * worker loses race.
9486 if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
9487 mutex_unlock(&nft_net->commit_mutex);
9491 ctx.net = trans->net;
9492 ctx.table = trans->set->table;
9494 nft_trans_gc_setelem_remove(&ctx, trans);
9495 mutex_unlock(&nft_net->commit_mutex);
9500 static void nft_trans_gc_work(struct work_struct *work)
9502 struct nft_trans_gc *trans, *next;
9503 LIST_HEAD(trans_gc_list);
9505 spin_lock(&nf_tables_gc_list_lock);
9506 list_splice_init(&nf_tables_gc_list, &trans_gc_list);
9507 spin_unlock(&nf_tables_gc_list_lock);
9509 list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
9510 list_del(&trans->list);
9511 if (!nft_trans_gc_work_done(trans)) {
9512 nft_trans_gc_destroy(trans);
9515 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9519 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
9520 unsigned int gc_seq, gfp_t gfp)
9522 struct net *net = read_pnet(&set->net);
9523 struct nft_trans_gc *trans;
9525 trans = kzalloc(sizeof(*trans), gfp);
9529 trans->net = maybe_get_net(net);
9535 refcount_inc(&set->refs);
9537 trans->seq = gc_seq;
9542 void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
9544 trans->priv[trans->count++] = priv;
9547 static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
9549 spin_lock(&nf_tables_gc_list_lock);
9550 list_add_tail(&trans->list, &nf_tables_gc_list);
9551 spin_unlock(&nf_tables_gc_list_lock);
9553 schedule_work(&trans_gc_work);
9556 static int nft_trans_gc_space(struct nft_trans_gc *trans)
9558 return NFT_TRANS_GC_BATCHCOUNT - trans->count;
9561 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
9562 unsigned int gc_seq, gfp_t gfp)
9564 if (nft_trans_gc_space(gc))
9567 nft_trans_gc_queue_work(gc);
9569 return nft_trans_gc_alloc(gc->set, gc_seq, gfp);
9572 void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
9574 if (trans->count == 0) {
9575 nft_trans_gc_destroy(trans);
9579 nft_trans_gc_queue_work(trans);
9582 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
9584 if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
9587 if (nft_trans_gc_space(gc))
9590 call_rcu(&gc->rcu, nft_trans_gc_trans_free);
9592 return nft_trans_gc_alloc(gc->set, 0, gfp);
9595 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
9597 WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
9599 if (trans->count == 0) {
9600 nft_trans_gc_destroy(trans);
9604 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9607 struct nft_trans_gc *nft_trans_gc_catchall(struct nft_trans_gc *gc,
9608 unsigned int gc_seq)
9610 struct nft_set_elem_catchall *catchall;
9611 const struct nft_set *set = gc->set;
9612 struct nft_set_ext *ext;
9614 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9615 ext = nft_set_elem_ext(set, catchall->elem);
9617 if (!nft_set_elem_expired(ext))
9619 if (nft_set_elem_is_dead(ext))
9622 nft_set_elem_dead(ext);
9624 gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
9628 nft_trans_gc_elem_add(gc, catchall->elem);
9634 static void nf_tables_module_autoload_cleanup(struct net *net)
9636 struct nftables_pernet *nft_net = nft_pernet(net);
9637 struct nft_module_request *req, *next;
9639 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9640 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9641 WARN_ON_ONCE(!req->done);
9642 list_del(&req->list);
9647 static void nf_tables_commit_release(struct net *net)
9649 struct nftables_pernet *nft_net = nft_pernet(net);
9650 struct nft_trans *trans;
9652 /* all side effects have to be made visible.
9653 * For example, if a chain named 'foo' has been deleted, a
9654 * new transaction must not find it anymore.
9656 * Memory reclaim happens asynchronously from work queue
9657 * to prevent expensive synchronize_rcu() in commit phase.
9659 if (list_empty(&nft_net->commit_list)) {
9660 nf_tables_module_autoload_cleanup(net);
9661 mutex_unlock(&nft_net->commit_mutex);
9665 trans = list_last_entry(&nft_net->commit_list,
9666 struct nft_trans, list);
9667 get_net(trans->ctx.net);
9668 WARN_ON_ONCE(trans->put_net);
9670 trans->put_net = true;
9671 spin_lock(&nf_tables_destroy_list_lock);
9672 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9673 spin_unlock(&nf_tables_destroy_list_lock);
9675 nf_tables_module_autoload_cleanup(net);
9676 schedule_work(&trans_destroy_work);
9678 mutex_unlock(&nft_net->commit_mutex);
9681 static void nft_commit_notify(struct net *net, u32 portid)
9683 struct nftables_pernet *nft_net = nft_pernet(net);
9684 struct sk_buff *batch_skb = NULL, *nskb, *skb;
9685 unsigned char *data;
9688 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9692 len = NLMSG_GOODSIZE - skb->len;
9693 list_del(&skb->list);
9697 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9698 data = skb_put(batch_skb, skb->len);
9699 memcpy(data, skb->data, skb->len);
9700 list_del(&skb->list);
9704 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9705 NFT_CB(batch_skb).report, GFP_KERNEL);
9710 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9711 NFT_CB(batch_skb).report, GFP_KERNEL);
9714 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9717 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9718 struct nft_table *table)
9720 struct nft_audit_data *adp;
9722 list_for_each_entry(adp, adl, list) {
9723 if (adp->table == table)
9726 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9730 list_add(&adp->list, adl);
9734 static void nf_tables_commit_audit_free(struct list_head *adl)
9736 struct nft_audit_data *adp, *adn;
9738 list_for_each_entry_safe(adp, adn, adl, list) {
9739 list_del(&adp->list);
9744 static void nf_tables_commit_audit_collect(struct list_head *adl,
9745 struct nft_table *table, u32 op)
9747 struct nft_audit_data *adp;
9749 list_for_each_entry(adp, adl, list) {
9750 if (adp->table == table)
9753 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9757 if (!adp->op || adp->op > op)
9761 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9763 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9765 struct nft_audit_data *adp, *adn;
9766 char aubuf[AUNFTABLENAMELEN];
9768 list_for_each_entry_safe(adp, adn, adl, list) {
9769 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9771 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9772 nft2audit_op[adp->op], GFP_KERNEL);
9773 list_del(&adp->list);
9778 static void nft_set_commit_update(struct list_head *set_update_list)
9780 struct nft_set *set, *next;
9782 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9783 list_del_init(&set->pending_update);
9785 if (!set->ops->commit)
9788 set->ops->commit(set);
9792 static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
9794 unsigned int gc_seq;
9796 /* Bump gc counter, it becomes odd, this is the busy mark. */
9797 gc_seq = READ_ONCE(nft_net->gc_seq);
9798 WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9803 static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
9805 WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9808 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9810 struct nftables_pernet *nft_net = nft_pernet(net);
9811 struct nft_trans *trans, *next;
9812 unsigned int base_seq, gc_seq;
9813 LIST_HEAD(set_update_list);
9814 struct nft_trans_elem *te;
9815 struct nft_chain *chain;
9816 struct nft_table *table;
9820 if (list_empty(&nft_net->commit_list)) {
9821 mutex_unlock(&nft_net->commit_mutex);
9825 list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
9826 switch (trans->msg_type) {
9827 case NFT_MSG_NEWSET:
9828 if (!nft_trans_set_update(trans) &&
9829 nft_set_is_anonymous(nft_trans_set(trans)) &&
9830 !nft_trans_set_bound(trans)) {
9831 pr_warn_once("nftables ruleset with unbound set\n");
9835 case NFT_MSG_NEWCHAIN:
9836 if (!nft_trans_chain_update(trans) &&
9837 nft_chain_binding(nft_trans_chain(trans)) &&
9838 !nft_trans_chain_bound(trans)) {
9839 pr_warn_once("nftables ruleset with unbound chain\n");
9846 /* 0. Validate ruleset, otherwise roll back for error reporting. */
9847 if (nf_tables_validate(net) < 0) {
9848 nft_net->validate_state = NFT_VALIDATE_DO;
9852 err = nft_flow_rule_offload_commit(net);
9856 /* 1. Allocate space for next generation rules_gen_X[] */
9857 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9860 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9862 nf_tables_commit_chain_prepare_cancel(net);
9863 nf_tables_commit_audit_free(&adl);
9866 if (trans->msg_type == NFT_MSG_NEWRULE ||
9867 trans->msg_type == NFT_MSG_DELRULE) {
9868 chain = trans->ctx.chain;
9870 ret = nf_tables_commit_chain_prepare(net, chain);
9872 nf_tables_commit_chain_prepare_cancel(net);
9873 nf_tables_commit_audit_free(&adl);
9879 /* step 2. Make rules_gen_X visible to packet path */
9880 list_for_each_entry(table, &nft_net->tables, list) {
9881 list_for_each_entry(chain, &table->chains, list)
9882 nf_tables_commit_chain(net, chain);
9886 * Bump generation counter, invalidate any dump in progress.
9887 * Cannot fail after this point.
9889 base_seq = READ_ONCE(nft_net->base_seq);
9890 while (++base_seq == 0)
9893 WRITE_ONCE(nft_net->base_seq, base_seq);
9895 gc_seq = nft_gc_seq_begin(nft_net);
9897 /* step 3. Start new generation, rules_gen_X now in use. */
9898 net->nft.gencursor = nft_gencursor_next(net);
9900 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9901 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9903 switch (trans->msg_type) {
9904 case NFT_MSG_NEWTABLE:
9905 if (nft_trans_table_update(trans)) {
9906 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9907 nft_trans_destroy(trans);
9910 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9911 nf_tables_table_disable(net, trans->ctx.table);
9913 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9915 nft_clear(net, trans->ctx.table);
9917 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
9918 nft_trans_destroy(trans);
9920 case NFT_MSG_DELTABLE:
9921 case NFT_MSG_DESTROYTABLE:
9922 list_del_rcu(&trans->ctx.table->list);
9923 nf_tables_table_notify(&trans->ctx, trans->msg_type);
9925 case NFT_MSG_NEWCHAIN:
9926 if (nft_trans_chain_update(trans)) {
9927 nft_chain_commit_update(trans);
9928 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
9929 &nft_trans_chain_hooks(trans));
9930 list_splice(&nft_trans_chain_hooks(trans),
9931 &nft_trans_basechain(trans)->hook_list);
9932 /* trans destroyed after rcu grace period */
9934 nft_chain_commit_drop_policy(trans);
9935 nft_clear(net, trans->ctx.chain);
9936 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
9937 nft_trans_destroy(trans);
9940 case NFT_MSG_DELCHAIN:
9941 case NFT_MSG_DESTROYCHAIN:
9942 if (nft_trans_chain_update(trans)) {
9943 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9944 &nft_trans_chain_hooks(trans));
9945 nft_netdev_unregister_hooks(net,
9946 &nft_trans_chain_hooks(trans),
9949 nft_chain_del(trans->ctx.chain);
9950 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9952 nf_tables_unregister_hook(trans->ctx.net,
9957 case NFT_MSG_NEWRULE:
9958 nft_clear(trans->ctx.net, nft_trans_rule(trans));
9959 nf_tables_rule_notify(&trans->ctx,
9960 nft_trans_rule(trans),
9962 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9963 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9965 nft_trans_destroy(trans);
9967 case NFT_MSG_DELRULE:
9968 case NFT_MSG_DESTROYRULE:
9969 list_del_rcu(&nft_trans_rule(trans)->list);
9970 nf_tables_rule_notify(&trans->ctx,
9971 nft_trans_rule(trans),
9973 nft_rule_expr_deactivate(&trans->ctx,
9974 nft_trans_rule(trans),
9977 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9978 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9980 case NFT_MSG_NEWSET:
9981 if (nft_trans_set_update(trans)) {
9982 struct nft_set *set = nft_trans_set(trans);
9984 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
9985 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
9987 if (nft_trans_set_size(trans))
9988 WRITE_ONCE(set->size, nft_trans_set_size(trans));
9990 nft_clear(net, nft_trans_set(trans));
9991 /* This avoids hitting -EBUSY when deleting the table
9992 * from the transaction.
9994 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
9995 !list_empty(&nft_trans_set(trans)->bindings))
9996 nft_use_dec(&trans->ctx.table->use);
9998 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9999 NFT_MSG_NEWSET, GFP_KERNEL);
10000 nft_trans_destroy(trans);
10002 case NFT_MSG_DELSET:
10003 case NFT_MSG_DESTROYSET:
10004 nft_trans_set(trans)->dead = 1;
10005 list_del_rcu(&nft_trans_set(trans)->list);
10006 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10007 trans->msg_type, GFP_KERNEL);
10009 case NFT_MSG_NEWSETELEM:
10010 te = (struct nft_trans_elem *)trans->data;
10012 nft_setelem_activate(net, te->set, &te->elem);
10013 nf_tables_setelem_notify(&trans->ctx, te->set,
10015 NFT_MSG_NEWSETELEM);
10016 if (te->set->ops->commit &&
10017 list_empty(&te->set->pending_update)) {
10018 list_add_tail(&te->set->pending_update,
10021 nft_trans_destroy(trans);
10023 case NFT_MSG_DELSETELEM:
10024 case NFT_MSG_DESTROYSETELEM:
10025 te = (struct nft_trans_elem *)trans->data;
10027 nf_tables_setelem_notify(&trans->ctx, te->set,
10030 nft_setelem_remove(net, te->set, &te->elem);
10031 if (!nft_setelem_is_catchall(te->set, &te->elem)) {
10032 atomic_dec(&te->set->nelems);
10035 if (te->set->ops->commit &&
10036 list_empty(&te->set->pending_update)) {
10037 list_add_tail(&te->set->pending_update,
10041 case NFT_MSG_NEWOBJ:
10042 if (nft_trans_obj_update(trans)) {
10043 nft_obj_commit_update(trans);
10044 nf_tables_obj_notify(&trans->ctx,
10045 nft_trans_obj(trans),
10048 nft_clear(net, nft_trans_obj(trans));
10049 nf_tables_obj_notify(&trans->ctx,
10050 nft_trans_obj(trans),
10052 nft_trans_destroy(trans);
10055 case NFT_MSG_DELOBJ:
10056 case NFT_MSG_DESTROYOBJ:
10057 nft_obj_del(nft_trans_obj(trans));
10058 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
10061 case NFT_MSG_NEWFLOWTABLE:
10062 if (nft_trans_flowtable_update(trans)) {
10063 nft_trans_flowtable(trans)->data.flags =
10064 nft_trans_flowtable_flags(trans);
10065 nf_tables_flowtable_notify(&trans->ctx,
10066 nft_trans_flowtable(trans),
10067 &nft_trans_flowtable_hooks(trans),
10068 NFT_MSG_NEWFLOWTABLE);
10069 list_splice(&nft_trans_flowtable_hooks(trans),
10070 &nft_trans_flowtable(trans)->hook_list);
10072 nft_clear(net, nft_trans_flowtable(trans));
10073 nf_tables_flowtable_notify(&trans->ctx,
10074 nft_trans_flowtable(trans),
10076 NFT_MSG_NEWFLOWTABLE);
10078 nft_trans_destroy(trans);
10080 case NFT_MSG_DELFLOWTABLE:
10081 case NFT_MSG_DESTROYFLOWTABLE:
10082 if (nft_trans_flowtable_update(trans)) {
10083 nf_tables_flowtable_notify(&trans->ctx,
10084 nft_trans_flowtable(trans),
10085 &nft_trans_flowtable_hooks(trans),
10087 nft_unregister_flowtable_net_hooks(net,
10088 &nft_trans_flowtable_hooks(trans));
10090 list_del_rcu(&nft_trans_flowtable(trans)->list);
10091 nf_tables_flowtable_notify(&trans->ctx,
10092 nft_trans_flowtable(trans),
10095 nft_unregister_flowtable_net_hooks(net,
10096 &nft_trans_flowtable(trans)->hook_list);
10102 nft_set_commit_update(&set_update_list);
10104 nft_commit_notify(net, NETLINK_CB(skb).portid);
10105 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
10106 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
10108 nft_gc_seq_end(nft_net, gc_seq);
10109 nft_net->validate_state = NFT_VALIDATE_SKIP;
10110 nf_tables_commit_release(net);
10115 static void nf_tables_module_autoload(struct net *net)
10117 struct nftables_pernet *nft_net = nft_pernet(net);
10118 struct nft_module_request *req, *next;
10119 LIST_HEAD(module_list);
10121 list_splice_init(&nft_net->module_list, &module_list);
10122 mutex_unlock(&nft_net->commit_mutex);
10123 list_for_each_entry_safe(req, next, &module_list, list) {
10124 request_module("%s", req->module);
10127 mutex_lock(&nft_net->commit_mutex);
10128 list_splice(&module_list, &nft_net->module_list);
10131 static void nf_tables_abort_release(struct nft_trans *trans)
10133 switch (trans->msg_type) {
10134 case NFT_MSG_NEWTABLE:
10135 nf_tables_table_destroy(&trans->ctx);
10137 case NFT_MSG_NEWCHAIN:
10138 if (nft_trans_chain_update(trans))
10139 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
10141 nf_tables_chain_destroy(&trans->ctx);
10143 case NFT_MSG_NEWRULE:
10144 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
10146 case NFT_MSG_NEWSET:
10147 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
10149 case NFT_MSG_NEWSETELEM:
10150 nft_set_elem_destroy(nft_trans_elem_set(trans),
10151 nft_trans_elem(trans).priv, true);
10153 case NFT_MSG_NEWOBJ:
10154 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
10156 case NFT_MSG_NEWFLOWTABLE:
10157 if (nft_trans_flowtable_update(trans))
10158 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
10160 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
10166 static void nft_set_abort_update(struct list_head *set_update_list)
10168 struct nft_set *set, *next;
10170 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10171 list_del_init(&set->pending_update);
10173 if (!set->ops->abort)
10176 set->ops->abort(set);
10180 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
10182 struct nftables_pernet *nft_net = nft_pernet(net);
10183 struct nft_trans *trans, *next;
10184 LIST_HEAD(set_update_list);
10185 struct nft_trans_elem *te;
10187 if (action == NFNL_ABORT_VALIDATE &&
10188 nf_tables_validate(net) < 0)
10191 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
10193 switch (trans->msg_type) {
10194 case NFT_MSG_NEWTABLE:
10195 if (nft_trans_table_update(trans)) {
10196 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10197 nft_trans_destroy(trans);
10200 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
10201 nf_tables_table_disable(net, trans->ctx.table);
10202 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
10203 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
10204 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
10206 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10207 nft_trans_destroy(trans);
10209 list_del_rcu(&trans->ctx.table->list);
10212 case NFT_MSG_DELTABLE:
10213 case NFT_MSG_DESTROYTABLE:
10214 nft_clear(trans->ctx.net, trans->ctx.table);
10215 nft_trans_destroy(trans);
10217 case NFT_MSG_NEWCHAIN:
10218 if (nft_trans_chain_update(trans)) {
10219 nft_netdev_unregister_hooks(net,
10220 &nft_trans_chain_hooks(trans),
10222 free_percpu(nft_trans_chain_stats(trans));
10223 kfree(nft_trans_chain_name(trans));
10224 nft_trans_destroy(trans);
10226 if (nft_trans_chain_bound(trans)) {
10227 nft_trans_destroy(trans);
10230 nft_use_dec_restore(&trans->ctx.table->use);
10231 nft_chain_del(trans->ctx.chain);
10232 nf_tables_unregister_hook(trans->ctx.net,
10237 case NFT_MSG_DELCHAIN:
10238 case NFT_MSG_DESTROYCHAIN:
10239 if (nft_trans_chain_update(trans)) {
10240 list_splice(&nft_trans_chain_hooks(trans),
10241 &nft_trans_basechain(trans)->hook_list);
10243 nft_use_inc_restore(&trans->ctx.table->use);
10244 nft_clear(trans->ctx.net, trans->ctx.chain);
10246 nft_trans_destroy(trans);
10248 case NFT_MSG_NEWRULE:
10249 if (nft_trans_rule_bound(trans)) {
10250 nft_trans_destroy(trans);
10253 nft_use_dec_restore(&trans->ctx.chain->use);
10254 list_del_rcu(&nft_trans_rule(trans)->list);
10255 nft_rule_expr_deactivate(&trans->ctx,
10256 nft_trans_rule(trans),
10258 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10259 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10261 case NFT_MSG_DELRULE:
10262 case NFT_MSG_DESTROYRULE:
10263 nft_use_inc_restore(&trans->ctx.chain->use);
10264 nft_clear(trans->ctx.net, nft_trans_rule(trans));
10265 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10266 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10267 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10269 nft_trans_destroy(trans);
10271 case NFT_MSG_NEWSET:
10272 if (nft_trans_set_update(trans)) {
10273 nft_trans_destroy(trans);
10276 nft_use_dec_restore(&trans->ctx.table->use);
10277 if (nft_trans_set_bound(trans)) {
10278 nft_trans_destroy(trans);
10281 list_del_rcu(&nft_trans_set(trans)->list);
10283 case NFT_MSG_DELSET:
10284 case NFT_MSG_DESTROYSET:
10285 nft_use_inc_restore(&trans->ctx.table->use);
10286 nft_clear(trans->ctx.net, nft_trans_set(trans));
10287 if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10288 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10290 nft_trans_destroy(trans);
10292 case NFT_MSG_NEWSETELEM:
10293 if (nft_trans_elem_set_bound(trans)) {
10294 nft_trans_destroy(trans);
10297 te = (struct nft_trans_elem *)trans->data;
10298 nft_setelem_remove(net, te->set, &te->elem);
10299 if (!nft_setelem_is_catchall(te->set, &te->elem))
10300 atomic_dec(&te->set->nelems);
10302 if (te->set->ops->abort &&
10303 list_empty(&te->set->pending_update)) {
10304 list_add_tail(&te->set->pending_update,
10308 case NFT_MSG_DELSETELEM:
10309 case NFT_MSG_DESTROYSETELEM:
10310 te = (struct nft_trans_elem *)trans->data;
10312 nft_setelem_data_activate(net, te->set, &te->elem);
10313 nft_setelem_activate(net, te->set, &te->elem);
10314 if (!nft_setelem_is_catchall(te->set, &te->elem))
10317 if (te->set->ops->abort &&
10318 list_empty(&te->set->pending_update)) {
10319 list_add_tail(&te->set->pending_update,
10322 nft_trans_destroy(trans);
10324 case NFT_MSG_NEWOBJ:
10325 if (nft_trans_obj_update(trans)) {
10326 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10327 nft_trans_destroy(trans);
10329 nft_use_dec_restore(&trans->ctx.table->use);
10330 nft_obj_del(nft_trans_obj(trans));
10333 case NFT_MSG_DELOBJ:
10334 case NFT_MSG_DESTROYOBJ:
10335 nft_use_inc_restore(&trans->ctx.table->use);
10336 nft_clear(trans->ctx.net, nft_trans_obj(trans));
10337 nft_trans_destroy(trans);
10339 case NFT_MSG_NEWFLOWTABLE:
10340 if (nft_trans_flowtable_update(trans)) {
10341 nft_unregister_flowtable_net_hooks(net,
10342 &nft_trans_flowtable_hooks(trans));
10344 nft_use_dec_restore(&trans->ctx.table->use);
10345 list_del_rcu(&nft_trans_flowtable(trans)->list);
10346 nft_unregister_flowtable_net_hooks(net,
10347 &nft_trans_flowtable(trans)->hook_list);
10350 case NFT_MSG_DELFLOWTABLE:
10351 case NFT_MSG_DESTROYFLOWTABLE:
10352 if (nft_trans_flowtable_update(trans)) {
10353 list_splice(&nft_trans_flowtable_hooks(trans),
10354 &nft_trans_flowtable(trans)->hook_list);
10356 nft_use_inc_restore(&trans->ctx.table->use);
10357 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10359 nft_trans_destroy(trans);
10364 nft_set_abort_update(&set_update_list);
10368 list_for_each_entry_safe_reverse(trans, next,
10369 &nft_net->commit_list, list) {
10370 nft_trans_list_del(trans);
10371 nf_tables_abort_release(trans);
10374 if (action == NFNL_ABORT_AUTOLOAD)
10375 nf_tables_module_autoload(net);
10377 nf_tables_module_autoload_cleanup(net);
10382 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10383 enum nfnl_abort_action action)
10385 struct nftables_pernet *nft_net = nft_pernet(net);
10386 unsigned int gc_seq;
10389 gc_seq = nft_gc_seq_begin(nft_net);
10390 ret = __nf_tables_abort(net, action);
10391 nft_gc_seq_end(nft_net, gc_seq);
10392 mutex_unlock(&nft_net->commit_mutex);
10397 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10399 struct nftables_pernet *nft_net = nft_pernet(net);
10402 mutex_lock(&nft_net->commit_mutex);
10404 genid_ok = genid == 0 || nft_net->base_seq == genid;
10406 mutex_unlock(&nft_net->commit_mutex);
10408 /* else, commit mutex has to be released by commit or abort function */
10412 static const struct nfnetlink_subsystem nf_tables_subsys = {
10413 .name = "nf_tables",
10414 .subsys_id = NFNL_SUBSYS_NFTABLES,
10415 .cb_count = NFT_MSG_MAX,
10416 .cb = nf_tables_cb,
10417 .commit = nf_tables_commit,
10418 .abort = nf_tables_abort,
10419 .valid_genid = nf_tables_valid_genid,
10420 .owner = THIS_MODULE,
10423 int nft_chain_validate_dependency(const struct nft_chain *chain,
10424 enum nft_chain_types type)
10426 const struct nft_base_chain *basechain;
10428 if (nft_is_base_chain(chain)) {
10429 basechain = nft_base_chain(chain);
10430 if (basechain->type->type != type)
10431 return -EOPNOTSUPP;
10435 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10437 int nft_chain_validate_hooks(const struct nft_chain *chain,
10438 unsigned int hook_flags)
10440 struct nft_base_chain *basechain;
10442 if (nft_is_base_chain(chain)) {
10443 basechain = nft_base_chain(chain);
10445 if ((1 << basechain->ops.hooknum) & hook_flags)
10448 return -EOPNOTSUPP;
10453 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10456 * Loop detection - walk through the ruleset beginning at the destination chain
10457 * of a new jump until either the source chain is reached (loop) or all
10458 * reachable chains have been traversed.
10460 * The loop check is performed whenever a new jump verdict is added to an
10461 * expression or verdict map or a verdict map is bound to a new chain.
10464 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10465 const struct nft_chain *chain);
10467 static int nft_check_loops(const struct nft_ctx *ctx,
10468 const struct nft_set_ext *ext)
10470 const struct nft_data *data;
10473 data = nft_set_ext_data(ext);
10474 switch (data->verdict.code) {
10477 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10487 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10488 struct nft_set *set,
10489 const struct nft_set_iter *iter,
10490 struct nft_set_elem *elem)
10492 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
10494 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10495 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10498 return nft_check_loops(ctx, ext);
10501 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10502 struct nft_set *set)
10504 u8 genmask = nft_genmask_next(ctx->net);
10505 struct nft_set_elem_catchall *catchall;
10506 struct nft_set_ext *ext;
10509 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10510 ext = nft_set_elem_ext(set, catchall->elem);
10511 if (!nft_set_elem_active(ext, genmask))
10514 ret = nft_check_loops(ctx, ext);
10522 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10523 const struct nft_chain *chain)
10525 const struct nft_rule *rule;
10526 const struct nft_expr *expr, *last;
10527 struct nft_set *set;
10528 struct nft_set_binding *binding;
10529 struct nft_set_iter iter;
10531 if (ctx->chain == chain)
10534 if (fatal_signal_pending(current))
10537 list_for_each_entry(rule, &chain->rules, list) {
10538 nft_rule_for_each_expr(expr, last, rule) {
10539 struct nft_immediate_expr *priv;
10540 const struct nft_data *data;
10543 if (strcmp(expr->ops->type->name, "immediate"))
10546 priv = nft_expr_priv(expr);
10547 if (priv->dreg != NFT_REG_VERDICT)
10550 data = &priv->data;
10551 switch (data->verdict.code) {
10554 err = nf_tables_check_loops(ctx,
10555 data->verdict.chain);
10565 list_for_each_entry(set, &ctx->table->sets, list) {
10566 if (!nft_is_active_next(ctx->net, set))
10568 if (!(set->flags & NFT_SET_MAP) ||
10569 set->dtype != NFT_DATA_VERDICT)
10572 list_for_each_entry(binding, &set->bindings, list) {
10573 if (!(binding->flags & NFT_SET_MAP) ||
10574 binding->chain != chain)
10577 iter.genmask = nft_genmask_next(ctx->net);
10581 iter.fn = nf_tables_loop_check_setelem;
10583 set->ops->walk(ctx, set, &iter);
10585 iter.err = nft_set_catchall_loops(ctx, set);
10596 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
10598 * @attr: netlink attribute to fetch value from
10599 * @max: maximum value to be stored in dest
10600 * @dest: pointer to the variable
10602 * Parse, check and store a given u32 netlink attribute into variable.
10603 * This function returns -ERANGE if the value goes over maximum value.
10604 * Otherwise a 0 is returned and the attribute value is stored in the
10605 * destination variable.
10607 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10611 val = ntohl(nla_get_be32(attr));
10618 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10620 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10624 reg = ntohl(nla_get_be32(attr));
10626 case NFT_REG_VERDICT...NFT_REG_4:
10627 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10629 case NFT_REG32_00...NFT_REG32_15:
10630 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10640 * nft_dump_register - dump a register value to a netlink attribute
10642 * @skb: socket buffer
10643 * @attr: attribute number
10644 * @reg: register number
10646 * Construct a netlink attribute containing the register number. For
10647 * compatibility reasons, register numbers being a multiple of 4 are
10648 * translated to the corresponding 128 bit register numbers.
10650 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10652 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10653 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10655 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10657 return nla_put_be32(skb, attr, htonl(reg));
10659 EXPORT_SYMBOL_GPL(nft_dump_register);
10661 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10663 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10667 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10673 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10678 err = nft_parse_register(attr, ®);
10682 err = nft_validate_register_load(reg, len);
10689 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10691 static int nft_validate_register_store(const struct nft_ctx *ctx,
10692 enum nft_registers reg,
10693 const struct nft_data *data,
10694 enum nft_data_types type,
10700 case NFT_REG_VERDICT:
10701 if (type != NFT_DATA_VERDICT)
10704 if (data != NULL &&
10705 (data->verdict.code == NFT_GOTO ||
10706 data->verdict.code == NFT_JUMP)) {
10707 err = nf_tables_check_loops(ctx, data->verdict.chain);
10714 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10718 if (reg * NFT_REG32_SIZE + len >
10719 sizeof_field(struct nft_regs, data))
10722 if (data != NULL && type != NFT_DATA_VALUE)
10728 int nft_parse_register_store(const struct nft_ctx *ctx,
10729 const struct nlattr *attr, u8 *dreg,
10730 const struct nft_data *data,
10731 enum nft_data_types type, unsigned int len)
10736 err = nft_parse_register(attr, ®);
10740 err = nft_validate_register_store(ctx, reg, data, type, len);
10747 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10749 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10750 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
10751 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
10752 .len = NFT_CHAIN_MAXNAMELEN - 1 },
10753 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10756 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10757 struct nft_data_desc *desc, const struct nlattr *nla)
10759 u8 genmask = nft_genmask_next(ctx->net);
10760 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10761 struct nft_chain *chain;
10764 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10765 nft_verdict_policy, NULL);
10769 if (!tb[NFTA_VERDICT_CODE])
10772 /* zero padding hole for memcmp */
10773 memset(data, 0, sizeof(*data));
10774 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10776 switch (data->verdict.code) {
10778 switch (data->verdict.code & NF_VERDICT_MASK) {
10793 if (tb[NFTA_VERDICT_CHAIN]) {
10794 chain = nft_chain_lookup(ctx->net, ctx->table,
10795 tb[NFTA_VERDICT_CHAIN],
10797 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10798 chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10799 tb[NFTA_VERDICT_CHAIN_ID],
10802 return PTR_ERR(chain);
10808 return PTR_ERR(chain);
10809 if (nft_is_base_chain(chain))
10810 return -EOPNOTSUPP;
10811 if (nft_chain_is_bound(chain))
10813 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10814 chain->flags & NFT_CHAIN_BINDING)
10816 if (!nft_use_inc(&chain->use))
10819 data->verdict.chain = chain;
10823 desc->len = sizeof(data->verdict);
10828 static void nft_verdict_uninit(const struct nft_data *data)
10830 struct nft_chain *chain;
10832 switch (data->verdict.code) {
10835 chain = data->verdict.chain;
10836 nft_use_dec(&chain->use);
10841 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10843 struct nlattr *nest;
10845 nest = nla_nest_start_noflag(skb, type);
10847 goto nla_put_failure;
10849 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10850 goto nla_put_failure;
10855 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10857 goto nla_put_failure;
10859 nla_nest_end(skb, nest);
10866 static int nft_value_init(const struct nft_ctx *ctx,
10867 struct nft_data *data, struct nft_data_desc *desc,
10868 const struct nlattr *nla)
10872 len = nla_len(nla);
10875 if (len > desc->size)
10878 if (len != desc->len)
10884 nla_memcpy(data->data, nla, len);
10889 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10892 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10895 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10896 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
10897 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
10901 * nft_data_init - parse nf_tables data netlink attributes
10903 * @ctx: context of the expression using the data
10904 * @data: destination struct nft_data
10905 * @desc: data description
10906 * @nla: netlink attribute containing data
10908 * Parse the netlink data attributes and initialize a struct nft_data.
10909 * The type and length of data are returned in the data description.
10911 * The caller can indicate that it only wants to accept data of type
10912 * NFT_DATA_VALUE by passing NULL for the ctx argument.
10914 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
10915 struct nft_data_desc *desc, const struct nlattr *nla)
10917 struct nlattr *tb[NFTA_DATA_MAX + 1];
10920 if (WARN_ON_ONCE(!desc->size))
10923 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
10924 nft_data_policy, NULL);
10928 if (tb[NFTA_DATA_VALUE]) {
10929 if (desc->type != NFT_DATA_VALUE)
10932 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
10933 } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
10934 if (desc->type != NFT_DATA_VERDICT)
10937 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
10944 EXPORT_SYMBOL_GPL(nft_data_init);
10947 * nft_data_release - release a nft_data item
10949 * @data: struct nft_data to release
10950 * @type: type of data
10952 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
10953 * all others need to be released by calling this function.
10955 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
10957 if (type < NFT_DATA_VERDICT)
10960 case NFT_DATA_VERDICT:
10961 return nft_verdict_uninit(data);
10966 EXPORT_SYMBOL_GPL(nft_data_release);
10968 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
10969 enum nft_data_types type, unsigned int len)
10971 struct nlattr *nest;
10974 nest = nla_nest_start_noflag(skb, attr);
10979 case NFT_DATA_VALUE:
10980 err = nft_value_dump(skb, data, len);
10982 case NFT_DATA_VERDICT:
10983 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
10990 nla_nest_end(skb, nest);
10993 EXPORT_SYMBOL_GPL(nft_data_dump);
10995 int __nft_release_basechain(struct nft_ctx *ctx)
10997 struct nft_rule *rule, *nr;
10999 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
11002 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
11003 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
11004 list_del(&rule->list);
11005 nft_use_dec(&ctx->chain->use);
11006 nf_tables_rule_release(ctx, rule);
11008 nft_chain_del(ctx->chain);
11009 nft_use_dec(&ctx->table->use);
11010 nf_tables_chain_destroy(ctx);
11014 EXPORT_SYMBOL_GPL(__nft_release_basechain);
11016 static void __nft_release_hook(struct net *net, struct nft_table *table)
11018 struct nft_flowtable *flowtable;
11019 struct nft_chain *chain;
11021 list_for_each_entry(chain, &table->chains, list)
11022 __nf_tables_unregister_hook(net, table, chain, true);
11023 list_for_each_entry(flowtable, &table->flowtables, list)
11024 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
11028 static void __nft_release_hooks(struct net *net)
11030 struct nftables_pernet *nft_net = nft_pernet(net);
11031 struct nft_table *table;
11033 list_for_each_entry(table, &nft_net->tables, list) {
11034 if (nft_table_has_owner(table))
11037 __nft_release_hook(net, table);
11041 static void __nft_release_table(struct net *net, struct nft_table *table)
11043 struct nft_flowtable *flowtable, *nf;
11044 struct nft_chain *chain, *nc;
11045 struct nft_object *obj, *ne;
11046 struct nft_rule *rule, *nr;
11047 struct nft_set *set, *ns;
11048 struct nft_ctx ctx = {
11050 .family = NFPROTO_NETDEV,
11053 ctx.family = table->family;
11055 list_for_each_entry(chain, &table->chains, list) {
11056 if (nft_chain_is_bound(chain))
11060 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
11061 list_del(&rule->list);
11062 nft_use_dec(&chain->use);
11063 nf_tables_rule_release(&ctx, rule);
11066 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
11067 list_del(&flowtable->list);
11068 nft_use_dec(&table->use);
11069 nf_tables_flowtable_destroy(flowtable);
11071 list_for_each_entry_safe(set, ns, &table->sets, list) {
11072 list_del(&set->list);
11073 nft_use_dec(&table->use);
11074 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
11075 nft_map_deactivate(&ctx, set);
11077 nft_set_destroy(&ctx, set);
11079 list_for_each_entry_safe(obj, ne, &table->objects, list) {
11081 nft_use_dec(&table->use);
11082 nft_obj_destroy(&ctx, obj);
11084 list_for_each_entry_safe(chain, nc, &table->chains, list) {
11086 nft_chain_del(chain);
11087 nft_use_dec(&table->use);
11088 nf_tables_chain_destroy(&ctx);
11090 nf_tables_table_destroy(&ctx);
11093 static void __nft_release_tables(struct net *net)
11095 struct nftables_pernet *nft_net = nft_pernet(net);
11096 struct nft_table *table, *nt;
11098 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
11099 if (nft_table_has_owner(table))
11102 list_del(&table->list);
11104 __nft_release_table(net, table);
11108 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
11111 struct nft_table *table, *to_delete[8];
11112 struct nftables_pernet *nft_net;
11113 struct netlink_notify *n = ptr;
11114 struct net *net = n->net;
11115 unsigned int deleted;
11116 bool restart = false;
11117 unsigned int gc_seq;
11119 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
11120 return NOTIFY_DONE;
11122 nft_net = nft_pernet(net);
11124 mutex_lock(&nft_net->commit_mutex);
11126 gc_seq = nft_gc_seq_begin(nft_net);
11128 if (!list_empty(&nf_tables_destroy_list))
11129 nf_tables_trans_destroy_flush_work();
11131 list_for_each_entry(table, &nft_net->tables, list) {
11132 if (nft_table_has_owner(table) &&
11133 n->portid == table->nlpid) {
11134 __nft_release_hook(net, table);
11135 list_del_rcu(&table->list);
11136 to_delete[deleted++] = table;
11137 if (deleted >= ARRAY_SIZE(to_delete))
11142 restart = deleted >= ARRAY_SIZE(to_delete);
11145 __nft_release_table(net, to_delete[--deleted]);
11150 nft_gc_seq_end(nft_net, gc_seq);
11152 mutex_unlock(&nft_net->commit_mutex);
11154 return NOTIFY_DONE;
11157 static struct notifier_block nft_nl_notifier = {
11158 .notifier_call = nft_rcv_nl_event,
11161 static int __net_init nf_tables_init_net(struct net *net)
11163 struct nftables_pernet *nft_net = nft_pernet(net);
11165 INIT_LIST_HEAD(&nft_net->tables);
11166 INIT_LIST_HEAD(&nft_net->commit_list);
11167 INIT_LIST_HEAD(&nft_net->binding_list);
11168 INIT_LIST_HEAD(&nft_net->module_list);
11169 INIT_LIST_HEAD(&nft_net->notify_list);
11170 mutex_init(&nft_net->commit_mutex);
11171 nft_net->base_seq = 1;
11172 nft_net->gc_seq = 0;
11173 nft_net->validate_state = NFT_VALIDATE_SKIP;
11178 static void __net_exit nf_tables_pre_exit_net(struct net *net)
11180 struct nftables_pernet *nft_net = nft_pernet(net);
11182 mutex_lock(&nft_net->commit_mutex);
11183 __nft_release_hooks(net);
11184 mutex_unlock(&nft_net->commit_mutex);
11187 static void __net_exit nf_tables_exit_net(struct net *net)
11189 struct nftables_pernet *nft_net = nft_pernet(net);
11190 unsigned int gc_seq;
11192 mutex_lock(&nft_net->commit_mutex);
11194 gc_seq = nft_gc_seq_begin(nft_net);
11196 if (!list_empty(&nft_net->commit_list) ||
11197 !list_empty(&nft_net->module_list))
11198 __nf_tables_abort(net, NFNL_ABORT_NONE);
11200 __nft_release_tables(net);
11202 nft_gc_seq_end(nft_net, gc_seq);
11204 mutex_unlock(&nft_net->commit_mutex);
11205 WARN_ON_ONCE(!list_empty(&nft_net->tables));
11206 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
11207 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
11210 static void nf_tables_exit_batch(struct list_head *net_exit_list)
11212 flush_work(&trans_gc_work);
11215 static struct pernet_operations nf_tables_net_ops = {
11216 .init = nf_tables_init_net,
11217 .pre_exit = nf_tables_pre_exit_net,
11218 .exit = nf_tables_exit_net,
11219 .exit_batch = nf_tables_exit_batch,
11220 .id = &nf_tables_net_id,
11221 .size = sizeof(struct nftables_pernet),
11224 static int __init nf_tables_module_init(void)
11228 err = register_pernet_subsys(&nf_tables_net_ops);
11232 err = nft_chain_filter_init();
11234 goto err_chain_filter;
11236 err = nf_tables_core_module_init();
11238 goto err_core_module;
11240 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
11242 goto err_netdev_notifier;
11244 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
11246 goto err_rht_objname;
11248 err = nft_offload_init();
11252 err = netlink_register_notifier(&nft_nl_notifier);
11254 goto err_netlink_notifier;
11257 err = nfnetlink_subsys_register(&nf_tables_subsys);
11259 goto err_nfnl_subsys;
11261 nft_chain_route_init();
11266 netlink_unregister_notifier(&nft_nl_notifier);
11267 err_netlink_notifier:
11268 nft_offload_exit();
11270 rhltable_destroy(&nft_objname_ht);
11272 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11273 err_netdev_notifier:
11274 nf_tables_core_module_exit();
11276 nft_chain_filter_fini();
11278 unregister_pernet_subsys(&nf_tables_net_ops);
11282 static void __exit nf_tables_module_exit(void)
11284 nfnetlink_subsys_unregister(&nf_tables_subsys);
11285 netlink_unregister_notifier(&nft_nl_notifier);
11286 nft_offload_exit();
11287 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11288 nft_chain_filter_fini();
11289 nft_chain_route_fini();
11290 unregister_pernet_subsys(&nf_tables_net_ops);
11291 cancel_work_sync(&trans_gc_work);
11292 cancel_work_sync(&trans_destroy_work);
11294 rhltable_destroy(&nft_objname_ht);
11295 nf_tables_core_module_exit();
11298 module_init(nf_tables_module_init);
11299 module_exit(nf_tables_module_exit);
11301 MODULE_LICENSE("GPL");
11302 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11303 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);