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_binding(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_binding(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 if (nft_chain_binding(chain))
2916 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2918 if (nla[NFTA_CHAIN_HOOK]) {
2919 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2922 if (nft_is_base_chain(chain)) {
2923 struct nft_base_chain *basechain = nft_base_chain(chain);
2925 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2926 return nft_delchain_hook(&ctx, basechain, extack);
2930 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2935 list_for_each_entry(rule, &chain->rules, list) {
2936 if (!nft_is_active_next(net, rule))
2940 err = nft_delrule(&ctx, rule);
2945 /* There are rules and elements that are still holding references to us,
2946 * we cannot do a recursive removal in this case.
2949 NL_SET_BAD_ATTR(extack, attr);
2953 return nft_delchain(&ctx);
2961 * nft_register_expr - register nf_tables expr type
2964 * Registers the expr type for use with nf_tables. Returns zero on
2965 * success or a negative errno code otherwise.
2967 int nft_register_expr(struct nft_expr_type *type)
2969 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2970 if (type->family == NFPROTO_UNSPEC)
2971 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2973 list_add_rcu(&type->list, &nf_tables_expressions);
2974 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2977 EXPORT_SYMBOL_GPL(nft_register_expr);
2980 * nft_unregister_expr - unregister nf_tables expr type
2983 * Unregisters the expr typefor use with nf_tables.
2985 void nft_unregister_expr(struct nft_expr_type *type)
2987 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2988 list_del_rcu(&type->list);
2989 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2991 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2993 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2996 const struct nft_expr_type *type, *candidate = NULL;
2998 list_for_each_entry(type, &nf_tables_expressions, list) {
2999 if (!nla_strcmp(nla, type->name)) {
3000 if (!type->family && !candidate)
3002 else if (type->family == family)
3009 #ifdef CONFIG_MODULES
3010 static int nft_expr_type_request_module(struct net *net, u8 family,
3013 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3014 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3021 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3025 const struct nft_expr_type *type;
3028 return ERR_PTR(-EINVAL);
3030 type = __nft_expr_type_get(family, nla);
3031 if (type != NULL && try_module_get(type->owner))
3034 lockdep_nfnl_nft_mutex_not_held();
3035 #ifdef CONFIG_MODULES
3037 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3038 return ERR_PTR(-EAGAIN);
3040 if (nft_request_module(net, "nft-expr-%.*s",
3042 (char *)nla_data(nla)) == -EAGAIN)
3043 return ERR_PTR(-EAGAIN);
3046 return ERR_PTR(-ENOENT);
3049 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3050 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
3051 .len = NFT_MODULE_AUTOLOAD_LIMIT },
3052 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
3055 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3056 const struct nft_expr *expr, bool reset)
3058 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3059 goto nla_put_failure;
3061 if (expr->ops->dump) {
3062 struct nlattr *data = nla_nest_start_noflag(skb,
3065 goto nla_put_failure;
3066 if (expr->ops->dump(skb, expr, reset) < 0)
3067 goto nla_put_failure;
3068 nla_nest_end(skb, data);
3077 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3078 const struct nft_expr *expr, bool reset)
3080 struct nlattr *nest;
3082 nest = nla_nest_start_noflag(skb, attr);
3084 goto nla_put_failure;
3085 if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3086 goto nla_put_failure;
3087 nla_nest_end(skb, nest);
3094 struct nft_expr_info {
3095 const struct nft_expr_ops *ops;
3096 const struct nlattr *attr;
3097 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
3100 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3101 const struct nlattr *nla,
3102 struct nft_expr_info *info)
3104 const struct nft_expr_type *type;
3105 const struct nft_expr_ops *ops;
3106 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3109 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3110 nft_expr_policy, NULL);
3114 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3116 return PTR_ERR(type);
3118 if (tb[NFTA_EXPR_DATA]) {
3119 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3121 type->policy, NULL);
3125 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3127 if (type->select_ops != NULL) {
3128 ops = type->select_ops(ctx,
3129 (const struct nlattr * const *)info->tb);
3132 #ifdef CONFIG_MODULES
3134 if (nft_expr_type_request_module(ctx->net,
3136 tb[NFTA_EXPR_NAME]) != -EAGAIN)
3150 module_put(type->owner);
3154 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3155 struct nft_expr_info *info)
3157 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3158 const struct nft_expr_type *type;
3161 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3162 nft_expr_policy, NULL);
3166 if (!tb[NFTA_EXPR_DATA])
3169 type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3173 if (!type->inner_ops)
3176 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3178 type->policy, NULL);
3183 info->ops = type->inner_ops;
3191 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3192 const struct nft_expr_info *expr_info,
3193 struct nft_expr *expr)
3195 const struct nft_expr_ops *ops = expr_info->ops;
3200 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3211 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3212 struct nft_expr *expr)
3214 const struct nft_expr_type *type = expr->ops->type;
3216 if (expr->ops->destroy)
3217 expr->ops->destroy(ctx, expr);
3218 module_put(type->owner);
3221 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3222 const struct nlattr *nla)
3224 struct nft_expr_info expr_info;
3225 struct nft_expr *expr;
3226 struct module *owner;
3229 err = nf_tables_expr_parse(ctx, nla, &expr_info);
3231 goto err_expr_parse;
3234 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3235 goto err_expr_stateful;
3238 expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3240 goto err_expr_stateful;
3242 err = nf_tables_newexpr(ctx, &expr_info, expr);
3250 owner = expr_info.ops->type->owner;
3251 if (expr_info.ops->type->release_ops)
3252 expr_info.ops->type->release_ops(expr_info.ops);
3256 return ERR_PTR(err);
3259 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3263 if (src->ops->clone) {
3264 dst->ops = src->ops;
3265 err = src->ops->clone(dst, src);
3269 memcpy(dst, src, src->ops->size);
3272 __module_get(src->ops->type->owner);
3277 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3279 nf_tables_expr_destroy(ctx, expr);
3287 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3290 struct nft_rule *rule;
3292 // FIXME: this sucks
3293 list_for_each_entry_rcu(rule, &chain->rules, list) {
3294 if (handle == rule->handle)
3298 return ERR_PTR(-ENOENT);
3301 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3302 const struct nlattr *nla)
3305 return ERR_PTR(-EINVAL);
3307 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3310 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3311 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
3312 .len = NFT_TABLE_MAXNAMELEN - 1 },
3313 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
3314 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3315 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
3316 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3317 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
3318 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
3319 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
3320 .len = NFT_USERDATA_MAXLEN },
3321 [NFTA_RULE_ID] = { .type = NLA_U32 },
3322 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3323 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
3326 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3327 u32 portid, u32 seq, int event,
3328 u32 flags, int family,
3329 const struct nft_table *table,
3330 const struct nft_chain *chain,
3331 const struct nft_rule *rule, u64 handle,
3334 struct nlmsghdr *nlh;
3335 const struct nft_expr *expr, *next;
3336 struct nlattr *list;
3337 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3339 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3342 goto nla_put_failure;
3344 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3345 goto nla_put_failure;
3346 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3347 goto nla_put_failure;
3348 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3350 goto nla_put_failure;
3352 if (event != NFT_MSG_DELRULE && handle) {
3353 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3355 goto nla_put_failure;
3358 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3359 nft_flow_rule_stats(chain, rule);
3361 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3363 goto nla_put_failure;
3364 nft_rule_for_each_expr(expr, next, rule) {
3365 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3366 goto nla_put_failure;
3368 nla_nest_end(skb, list);
3371 struct nft_userdata *udata = nft_userdata(rule);
3372 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3374 goto nla_put_failure;
3377 nlmsg_end(skb, nlh);
3381 nlmsg_trim(skb, nlh);
3385 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3386 const struct nft_rule *rule, int event)
3388 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3389 const struct nft_rule *prule;
3390 struct sk_buff *skb;
3396 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3399 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3403 if (event == NFT_MSG_NEWRULE &&
3404 !list_is_first(&rule->list, &ctx->chain->rules) &&
3405 !list_is_last(&rule->list, &ctx->chain->rules)) {
3406 prule = list_prev_entry(rule, list);
3407 handle = prule->handle;
3409 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3410 flags |= NLM_F_APPEND;
3411 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3412 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3414 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3415 event, flags, ctx->family, ctx->table,
3416 ctx->chain, rule, handle, false);
3422 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3425 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3428 static void audit_log_rule_reset(const struct nft_table *table,
3429 unsigned int base_seq,
3430 unsigned int nentries)
3432 char *buf = kasprintf(GFP_ATOMIC, "%s:%u",
3433 table->name, base_seq);
3435 audit_log_nfcfg(buf, table->family, nentries,
3436 AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3440 struct nft_rule_dump_ctx {
3445 static int __nf_tables_dump_rules(struct sk_buff *skb,
3447 struct netlink_callback *cb,
3448 const struct nft_table *table,
3449 const struct nft_chain *chain,
3452 struct net *net = sock_net(skb->sk);
3453 const struct nft_rule *rule, *prule;
3454 unsigned int s_idx = cb->args[0];
3458 list_for_each_entry_rcu(rule, &chain->rules, list) {
3459 if (!nft_is_active(net, rule))
3464 memset(&cb->args[1], 0,
3465 sizeof(cb->args) - sizeof(cb->args[0]));
3468 handle = prule->handle;
3472 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3475 NLM_F_MULTI | NLM_F_APPEND,
3477 table, chain, rule, handle, reset) < 0)
3480 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3488 audit_log_rule_reset(table, cb->seq, *idx);
3493 static int nf_tables_dump_rules(struct sk_buff *skb,
3494 struct netlink_callback *cb)
3496 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3497 const struct nft_rule_dump_ctx *ctx = cb->data;
3498 struct nft_table *table;
3499 const struct nft_chain *chain;
3500 unsigned int idx = 0;
3501 struct net *net = sock_net(skb->sk);
3502 int family = nfmsg->nfgen_family;
3503 struct nftables_pernet *nft_net;
3506 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3510 nft_net = nft_pernet(net);
3511 cb->seq = READ_ONCE(nft_net->base_seq);
3513 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3514 if (family != NFPROTO_UNSPEC && family != table->family)
3517 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3520 if (ctx && ctx->table && ctx->chain) {
3521 struct rhlist_head *list, *tmp;
3523 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3524 nft_chain_ht_params);
3528 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3529 if (!nft_is_active(net, chain))
3531 __nf_tables_dump_rules(skb, &idx,
3532 cb, table, chain, reset);
3538 list_for_each_entry_rcu(chain, &table->chains, list) {
3539 if (__nf_tables_dump_rules(skb, &idx,
3540 cb, table, chain, reset))
3544 if (ctx && ctx->table)
3554 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3556 const struct nlattr * const *nla = cb->data;
3557 struct nft_rule_dump_ctx *ctx = NULL;
3559 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3560 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3564 if (nla[NFTA_RULE_TABLE]) {
3565 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3572 if (nla[NFTA_RULE_CHAIN]) {
3573 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3587 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3589 struct nft_rule_dump_ctx *ctx = cb->data;
3599 /* called with rcu_read_lock held */
3600 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3601 const struct nlattr * const nla[])
3603 struct netlink_ext_ack *extack = info->extack;
3604 u8 genmask = nft_genmask_cur(info->net);
3605 u8 family = info->nfmsg->nfgen_family;
3606 const struct nft_chain *chain;
3607 const struct nft_rule *rule;
3608 struct net *net = info->net;
3609 struct nft_table *table;
3610 struct sk_buff *skb2;
3614 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3615 struct netlink_dump_control c = {
3616 .start= nf_tables_dump_rules_start,
3617 .dump = nf_tables_dump_rules,
3618 .done = nf_tables_dump_rules_done,
3619 .module = THIS_MODULE,
3620 .data = (void *)nla,
3623 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3626 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3627 if (IS_ERR(table)) {
3628 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3629 return PTR_ERR(table);
3632 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3633 if (IS_ERR(chain)) {
3634 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3635 return PTR_ERR(chain);
3638 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3640 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3641 return PTR_ERR(rule);
3644 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3648 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3651 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3652 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3653 family, table, chain, rule, 0, reset);
3655 goto err_fill_rule_info;
3658 audit_log_rule_reset(table, nft_pernet(net)->base_seq, 1);
3660 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3667 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3669 struct nft_expr *expr, *next;
3672 * Careful: some expressions might not be initialized in case this
3673 * is called on error from nf_tables_newrule().
3675 expr = nft_expr_first(rule);
3676 while (nft_expr_more(rule, expr)) {
3677 next = nft_expr_next(expr);
3678 nf_tables_expr_destroy(ctx, expr);
3684 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3686 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3687 nf_tables_rule_destroy(ctx, rule);
3690 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3692 struct nft_expr *expr, *last;
3693 const struct nft_data *data;
3694 struct nft_rule *rule;
3697 if (ctx->level == NFT_JUMP_STACK_SIZE)
3700 list_for_each_entry(rule, &chain->rules, list) {
3701 if (fatal_signal_pending(current))
3704 if (!nft_is_active_next(ctx->net, rule))
3707 nft_rule_for_each_expr(expr, last, rule) {
3708 if (!expr->ops->validate)
3711 err = expr->ops->validate(ctx, expr, &data);
3719 EXPORT_SYMBOL_GPL(nft_chain_validate);
3721 static int nft_table_validate(struct net *net, const struct nft_table *table)
3723 struct nft_chain *chain;
3724 struct nft_ctx ctx = {
3726 .family = table->family,
3730 list_for_each_entry(chain, &table->chains, list) {
3731 if (!nft_is_base_chain(chain))
3735 err = nft_chain_validate(&ctx, chain);
3745 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3746 const struct nft_set_iter *iter,
3747 struct nft_set_elem *elem)
3749 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3750 struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3751 const struct nft_data *data;
3754 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3755 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3758 data = nft_set_ext_data(ext);
3759 switch (data->verdict.code) {
3763 err = nft_chain_validate(ctx, data->verdict.chain);
3775 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3777 u8 genmask = nft_genmask_next(ctx->net);
3778 struct nft_set_elem_catchall *catchall;
3779 struct nft_set_elem elem;
3780 struct nft_set_ext *ext;
3783 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3784 ext = nft_set_elem_ext(set, catchall->elem);
3785 if (!nft_set_elem_active(ext, genmask))
3788 elem.priv = catchall->elem;
3789 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3797 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3798 const struct nft_chain *chain,
3799 const struct nlattr *nla);
3801 #define NFT_RULE_MAXEXPRS 128
3803 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3804 const struct nlattr * const nla[])
3806 struct nftables_pernet *nft_net = nft_pernet(info->net);
3807 struct netlink_ext_ack *extack = info->extack;
3808 unsigned int size, i, n, ulen = 0, usize = 0;
3809 u8 genmask = nft_genmask_next(info->net);
3810 struct nft_rule *rule, *old_rule = NULL;
3811 struct nft_expr_info *expr_info = NULL;
3812 u8 family = info->nfmsg->nfgen_family;
3813 struct nft_flow_rule *flow = NULL;
3814 struct net *net = info->net;
3815 struct nft_userdata *udata;
3816 struct nft_table *table;
3817 struct nft_chain *chain;
3818 struct nft_trans *trans;
3819 u64 handle, pos_handle;
3820 struct nft_expr *expr;
3825 lockdep_assert_held(&nft_net->commit_mutex);
3827 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3828 NETLINK_CB(skb).portid);
3829 if (IS_ERR(table)) {
3830 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3831 return PTR_ERR(table);
3834 if (nla[NFTA_RULE_CHAIN]) {
3835 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3837 if (IS_ERR(chain)) {
3838 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3839 return PTR_ERR(chain);
3842 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3843 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3845 if (IS_ERR(chain)) {
3846 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3847 return PTR_ERR(chain);
3853 if (nft_chain_is_bound(chain))
3856 if (nla[NFTA_RULE_HANDLE]) {
3857 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3858 rule = __nft_rule_lookup(chain, handle);
3860 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3861 return PTR_ERR(rule);
3864 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3865 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3868 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3873 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3874 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3876 handle = nf_tables_alloc_handle(table);
3878 if (nla[NFTA_RULE_POSITION]) {
3879 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3880 old_rule = __nft_rule_lookup(chain, pos_handle);
3881 if (IS_ERR(old_rule)) {
3882 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3883 return PTR_ERR(old_rule);
3885 } else if (nla[NFTA_RULE_POSITION_ID]) {
3886 old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3887 if (IS_ERR(old_rule)) {
3888 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3889 return PTR_ERR(old_rule);
3894 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3898 if (nla[NFTA_RULE_EXPRESSIONS]) {
3899 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3900 sizeof(struct nft_expr_info),
3905 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3907 if (nla_type(tmp) != NFTA_LIST_ELEM)
3908 goto err_release_expr;
3909 if (n == NFT_RULE_MAXEXPRS)
3910 goto err_release_expr;
3911 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3913 NL_SET_BAD_ATTR(extack, tmp);
3914 goto err_release_expr;
3916 size += expr_info[n].ops->size;
3920 /* Check for overflow of dlen field */
3922 if (size >= 1 << 12)
3923 goto err_release_expr;
3925 if (nla[NFTA_RULE_USERDATA]) {
3926 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3928 usize = sizeof(struct nft_userdata) + ulen;
3932 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3934 goto err_release_expr;
3936 nft_activate_next(net, rule);
3938 rule->handle = handle;
3940 rule->udata = ulen ? 1 : 0;
3943 udata = nft_userdata(rule);
3944 udata->len = ulen - 1;
3945 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3948 expr = nft_expr_first(rule);
3949 for (i = 0; i < n; i++) {
3950 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3952 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3953 goto err_release_rule;
3956 if (expr_info[i].ops->validate)
3957 nft_validate_state_update(table, NFT_VALIDATE_NEED);
3959 expr_info[i].ops = NULL;
3960 expr = nft_expr_next(expr);
3963 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3964 flow = nft_flow_rule_create(net, rule);
3966 err = PTR_ERR(flow);
3967 goto err_release_rule;
3971 if (!nft_use_inc(&chain->use)) {
3973 goto err_release_rule;
3976 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3977 if (nft_chain_binding(chain)) {
3979 goto err_destroy_flow_rule;
3982 err = nft_delrule(&ctx, old_rule);
3984 goto err_destroy_flow_rule;
3986 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3987 if (trans == NULL) {
3989 goto err_destroy_flow_rule;
3991 list_add_tail_rcu(&rule->list, &old_rule->list);
3993 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3996 goto err_destroy_flow_rule;
3999 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
4001 list_add_rcu(&rule->list, &old_rule->list);
4003 list_add_tail_rcu(&rule->list, &chain->rules);
4006 list_add_tail_rcu(&rule->list, &old_rule->list);
4008 list_add_rcu(&rule->list, &chain->rules);
4014 nft_trans_flow_rule(trans) = flow;
4016 if (table->validate_state == NFT_VALIDATE_DO)
4017 return nft_table_validate(net, table);
4021 err_destroy_flow_rule:
4022 nft_use_dec_restore(&chain->use);
4024 nft_flow_rule_destroy(flow);
4026 nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
4027 nf_tables_rule_destroy(&ctx, rule);
4029 for (i = 0; i < n; i++) {
4030 if (expr_info[i].ops) {
4031 module_put(expr_info[i].ops->type->owner);
4032 if (expr_info[i].ops->type->release_ops)
4033 expr_info[i].ops->type->release_ops(expr_info[i].ops);
4041 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4042 const struct nft_chain *chain,
4043 const struct nlattr *nla)
4045 struct nftables_pernet *nft_net = nft_pernet(net);
4046 u32 id = ntohl(nla_get_be32(nla));
4047 struct nft_trans *trans;
4049 list_for_each_entry(trans, &nft_net->commit_list, list) {
4050 if (trans->msg_type == NFT_MSG_NEWRULE &&
4051 trans->ctx.chain == chain &&
4052 id == nft_trans_rule_id(trans))
4053 return nft_trans_rule(trans);
4055 return ERR_PTR(-ENOENT);
4058 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4059 const struct nlattr * const nla[])
4061 struct netlink_ext_ack *extack = info->extack;
4062 u8 genmask = nft_genmask_next(info->net);
4063 u8 family = info->nfmsg->nfgen_family;
4064 struct nft_chain *chain = NULL;
4065 struct net *net = info->net;
4066 struct nft_table *table;
4067 struct nft_rule *rule;
4071 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4072 NETLINK_CB(skb).portid);
4073 if (IS_ERR(table)) {
4074 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4075 return PTR_ERR(table);
4078 if (nla[NFTA_RULE_CHAIN]) {
4079 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4081 if (IS_ERR(chain)) {
4082 if (PTR_ERR(chain) == -ENOENT &&
4083 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4086 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4087 return PTR_ERR(chain);
4089 if (nft_chain_binding(chain))
4093 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4096 if (nla[NFTA_RULE_HANDLE]) {
4097 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4099 if (PTR_ERR(rule) == -ENOENT &&
4100 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4103 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4104 return PTR_ERR(rule);
4107 err = nft_delrule(&ctx, rule);
4108 } else if (nla[NFTA_RULE_ID]) {
4109 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4111 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4112 return PTR_ERR(rule);
4115 err = nft_delrule(&ctx, rule);
4117 err = nft_delrule_by_chain(&ctx);
4120 list_for_each_entry(chain, &table->chains, list) {
4121 if (!nft_is_active_next(net, chain))
4123 if (nft_chain_binding(chain))
4127 err = nft_delrule_by_chain(&ctx);
4139 static const struct nft_set_type *nft_set_types[] = {
4140 &nft_set_hash_fast_type,
4142 &nft_set_rhash_type,
4143 &nft_set_bitmap_type,
4144 &nft_set_rbtree_type,
4145 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4146 &nft_set_pipapo_avx2_type,
4148 &nft_set_pipapo_type,
4151 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
4152 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4155 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4157 return (flags & type->features) == (flags & NFT_SET_FEATURES);
4161 * Select a set implementation based on the data characteristics and the
4162 * given policy. The total memory use might not be known if no size is
4163 * given, in that case the amount of memory per element is used.
4165 static const struct nft_set_ops *
4166 nft_select_set_ops(const struct nft_ctx *ctx,
4167 const struct nlattr * const nla[],
4168 const struct nft_set_desc *desc)
4170 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4171 const struct nft_set_ops *ops, *bops;
4172 struct nft_set_estimate est, best;
4173 const struct nft_set_type *type;
4177 lockdep_assert_held(&nft_net->commit_mutex);
4178 lockdep_nfnl_nft_mutex_not_held();
4180 if (nla[NFTA_SET_FLAGS] != NULL)
4181 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4188 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4189 type = nft_set_types[i];
4192 if (!nft_set_ops_candidate(type, flags))
4194 if (!ops->estimate(desc, flags, &est))
4197 switch (desc->policy) {
4198 case NFT_SET_POL_PERFORMANCE:
4199 if (est.lookup < best.lookup)
4201 if (est.lookup == best.lookup &&
4202 est.space < best.space)
4205 case NFT_SET_POL_MEMORY:
4207 if (est.space < best.space)
4209 if (est.space == best.space &&
4210 est.lookup < best.lookup)
4212 } else if (est.size < best.size || !bops) {
4227 return ERR_PTR(-EOPNOTSUPP);
4230 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4231 [NFTA_SET_TABLE] = { .type = NLA_STRING,
4232 .len = NFT_TABLE_MAXNAMELEN - 1 },
4233 [NFTA_SET_NAME] = { .type = NLA_STRING,
4234 .len = NFT_SET_MAXNAMELEN - 1 },
4235 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
4236 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
4237 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
4238 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
4239 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
4240 [NFTA_SET_POLICY] = { .type = NLA_U32 },
4241 [NFTA_SET_DESC] = { .type = NLA_NESTED },
4242 [NFTA_SET_ID] = { .type = NLA_U32 },
4243 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
4244 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
4245 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
4246 .len = NFT_USERDATA_MAXLEN },
4247 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
4248 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
4249 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
4250 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
4253 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4254 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
4255 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
4258 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4259 const struct nlattr *nla, u8 genmask)
4261 struct nft_set *set;
4264 return ERR_PTR(-EINVAL);
4266 list_for_each_entry_rcu(set, &table->sets, list) {
4267 if (!nla_strcmp(nla, set->name) &&
4268 nft_active_genmask(set, genmask))
4271 return ERR_PTR(-ENOENT);
4274 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4275 const struct nlattr *nla,
4278 struct nft_set *set;
4280 list_for_each_entry(set, &table->sets, list) {
4281 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4282 nft_active_genmask(set, genmask))
4285 return ERR_PTR(-ENOENT);
4288 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4289 const struct nft_table *table,
4290 const struct nlattr *nla, u8 genmask)
4292 struct nftables_pernet *nft_net = nft_pernet(net);
4293 u32 id = ntohl(nla_get_be32(nla));
4294 struct nft_trans *trans;
4296 list_for_each_entry(trans, &nft_net->commit_list, list) {
4297 if (trans->msg_type == NFT_MSG_NEWSET) {
4298 struct nft_set *set = nft_trans_set(trans);
4300 if (id == nft_trans_set_id(trans) &&
4301 set->table == table &&
4302 nft_active_genmask(set, genmask))
4306 return ERR_PTR(-ENOENT);
4309 struct nft_set *nft_set_lookup_global(const struct net *net,
4310 const struct nft_table *table,
4311 const struct nlattr *nla_set_name,
4312 const struct nlattr *nla_set_id,
4315 struct nft_set *set;
4317 set = nft_set_lookup(table, nla_set_name, genmask);
4322 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4326 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4328 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4331 const struct nft_set *i;
4333 unsigned long *inuse;
4334 unsigned int n = 0, min = 0;
4336 p = strchr(name, '%');
4338 if (p[1] != 'd' || strchr(p + 2, '%'))
4341 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4345 list_for_each_entry(i, &ctx->table->sets, list) {
4348 if (!nft_is_active_next(ctx->net, i))
4350 if (!sscanf(i->name, name, &tmp))
4352 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4355 set_bit(tmp - min, inuse);
4358 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4359 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4360 min += BITS_PER_BYTE * PAGE_SIZE;
4361 memset(inuse, 0, PAGE_SIZE);
4364 free_page((unsigned long)inuse);
4367 set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4371 list_for_each_entry(i, &ctx->table->sets, list) {
4372 if (!nft_is_active_next(ctx->net, i))
4374 if (!strcmp(set->name, i->name)) {
4383 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4385 u64 ms = be64_to_cpu(nla_get_be64(nla));
4386 u64 max = (u64)(~((u64)0));
4388 max = div_u64(max, NSEC_PER_MSEC);
4392 ms *= NSEC_PER_MSEC;
4393 *result = nsecs_to_jiffies64(ms);
4397 __be64 nf_jiffies64_to_msecs(u64 input)
4399 return cpu_to_be64(jiffies64_to_msecs(input));
4402 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4403 const struct nft_set *set)
4405 struct nlattr *concat, *field;
4408 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4412 for (i = 0; i < set->field_count; i++) {
4413 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4417 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4418 htonl(set->field_len[i])))
4421 nla_nest_end(skb, field);
4424 nla_nest_end(skb, concat);
4429 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4430 const struct nft_set *set, u16 event, u16 flags)
4432 u64 timeout = READ_ONCE(set->timeout);
4433 u32 gc_int = READ_ONCE(set->gc_int);
4434 u32 portid = ctx->portid;
4435 struct nlmsghdr *nlh;
4436 struct nlattr *nest;
4440 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4441 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4442 NFNETLINK_V0, nft_base_seq(ctx->net));
4444 goto nla_put_failure;
4446 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4447 goto nla_put_failure;
4448 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4449 goto nla_put_failure;
4450 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4452 goto nla_put_failure;
4454 if (event == NFT_MSG_DELSET) {
4455 nlmsg_end(skb, nlh);
4459 if (set->flags != 0)
4460 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4461 goto nla_put_failure;
4463 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4464 goto nla_put_failure;
4465 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4466 goto nla_put_failure;
4467 if (set->flags & NFT_SET_MAP) {
4468 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4469 goto nla_put_failure;
4470 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4471 goto nla_put_failure;
4473 if (set->flags & NFT_SET_OBJECT &&
4474 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4475 goto nla_put_failure;
4478 nla_put_be64(skb, NFTA_SET_TIMEOUT,
4479 nf_jiffies64_to_msecs(timeout),
4481 goto nla_put_failure;
4483 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4484 goto nla_put_failure;
4486 if (set->policy != NFT_SET_POL_PERFORMANCE) {
4487 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4488 goto nla_put_failure;
4492 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4493 goto nla_put_failure;
4495 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4497 goto nla_put_failure;
4499 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4500 goto nla_put_failure;
4502 if (set->field_count > 1 &&
4503 nf_tables_fill_set_concat(skb, set))
4504 goto nla_put_failure;
4506 nla_nest_end(skb, nest);
4508 if (set->num_exprs == 1) {
4509 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4510 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4511 goto nla_put_failure;
4513 nla_nest_end(skb, nest);
4514 } else if (set->num_exprs > 1) {
4515 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4517 goto nla_put_failure;
4519 for (i = 0; i < set->num_exprs; i++) {
4520 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4521 set->exprs[i], false) < 0)
4522 goto nla_put_failure;
4524 nla_nest_end(skb, nest);
4527 nlmsg_end(skb, nlh);
4531 nlmsg_trim(skb, nlh);
4535 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4536 const struct nft_set *set, int event,
4539 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4540 u32 portid = ctx->portid;
4541 struct sk_buff *skb;
4546 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4549 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4553 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4554 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4556 err = nf_tables_fill_set(skb, ctx, set, event, flags);
4562 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4565 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4568 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4570 const struct nft_set *set;
4571 unsigned int idx, s_idx = cb->args[0];
4572 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4573 struct net *net = sock_net(skb->sk);
4574 struct nft_ctx *ctx = cb->data, ctx_set;
4575 struct nftables_pernet *nft_net;
4581 nft_net = nft_pernet(net);
4582 cb->seq = READ_ONCE(nft_net->base_seq);
4584 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4585 if (ctx->family != NFPROTO_UNSPEC &&
4586 ctx->family != table->family)
4589 if (ctx->table && ctx->table != table)
4593 if (cur_table != table)
4599 list_for_each_entry_rcu(set, &table->sets, list) {
4602 if (!nft_is_active(net, set))
4606 ctx_set.table = table;
4607 ctx_set.family = table->family;
4609 if (nf_tables_fill_set(skb, &ctx_set, set,
4613 cb->args[2] = (unsigned long) table;
4616 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4629 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4631 struct nft_ctx *ctx_dump = NULL;
4633 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4634 if (ctx_dump == NULL)
4637 cb->data = ctx_dump;
4641 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4647 /* called with rcu_read_lock held */
4648 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4649 const struct nlattr * const nla[])
4651 struct netlink_ext_ack *extack = info->extack;
4652 u8 genmask = nft_genmask_cur(info->net);
4653 u8 family = info->nfmsg->nfgen_family;
4654 struct nft_table *table = NULL;
4655 struct net *net = info->net;
4656 const struct nft_set *set;
4657 struct sk_buff *skb2;
4661 if (nla[NFTA_SET_TABLE]) {
4662 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4664 if (IS_ERR(table)) {
4665 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4666 return PTR_ERR(table);
4670 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4672 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4673 struct netlink_dump_control c = {
4674 .start = nf_tables_dump_sets_start,
4675 .dump = nf_tables_dump_sets,
4676 .done = nf_tables_dump_sets_done,
4678 .module = THIS_MODULE,
4681 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4684 /* Only accept unspec with dump */
4685 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4686 return -EAFNOSUPPORT;
4687 if (!nla[NFTA_SET_TABLE])
4690 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4692 return PTR_ERR(set);
4694 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4698 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4700 goto err_fill_set_info;
4702 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4709 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4710 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4713 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4714 struct nft_set_desc *desc)
4716 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4720 if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4723 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4724 nft_concat_policy, NULL);
4728 if (!tb[NFTA_SET_FIELD_LEN])
4731 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4732 if (!len || len > U8_MAX)
4735 desc->field_len[desc->field_count++] = len;
4740 static int nft_set_desc_concat(struct nft_set_desc *desc,
4741 const struct nlattr *nla)
4743 struct nlattr *attr;
4747 nla_for_each_nested(attr, nla, rem) {
4748 if (nla_type(attr) != NFTA_LIST_ELEM)
4751 err = nft_set_desc_concat_parse(attr, desc);
4756 for (i = 0; i < desc->field_count; i++)
4757 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4759 if (num_regs > NFT_REG32_COUNT)
4765 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4766 const struct nlattr *nla)
4768 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4771 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4772 nft_set_desc_policy, NULL);
4776 if (da[NFTA_SET_DESC_SIZE] != NULL)
4777 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4778 if (da[NFTA_SET_DESC_CONCAT])
4779 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4784 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4785 const struct nlattr * const *nla,
4786 struct nft_expr **exprs, int *num_exprs,
4789 struct nft_expr *expr;
4792 if (nla[NFTA_SET_EXPR]) {
4793 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4795 err = PTR_ERR(expr);
4796 goto err_set_expr_alloc;
4800 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4804 if (!(flags & NFT_SET_EXPR)) {
4806 goto err_set_expr_alloc;
4809 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4810 if (i == NFT_SET_EXPR_MAX) {
4812 goto err_set_expr_alloc;
4814 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4816 goto err_set_expr_alloc;
4818 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4820 err = PTR_ERR(expr);
4821 goto err_set_expr_alloc;
4831 for (i = 0; i < *num_exprs; i++)
4832 nft_expr_destroy(ctx, exprs[i]);
4837 static bool nft_set_is_same(const struct nft_set *set,
4838 const struct nft_set_desc *desc,
4839 struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4843 if (set->ktype != desc->ktype ||
4844 set->dtype != desc->dtype ||
4845 set->flags != flags ||
4846 set->klen != desc->klen ||
4847 set->dlen != desc->dlen ||
4848 set->field_count != desc->field_count ||
4849 set->num_exprs != num_exprs)
4852 for (i = 0; i < desc->field_count; i++) {
4853 if (set->field_len[i] != desc->field_len[i])
4857 for (i = 0; i < num_exprs; i++) {
4858 if (set->exprs[i]->ops != exprs[i]->ops)
4865 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4866 const struct nlattr * const nla[])
4868 struct netlink_ext_ack *extack = info->extack;
4869 u8 genmask = nft_genmask_next(info->net);
4870 u8 family = info->nfmsg->nfgen_family;
4871 const struct nft_set_ops *ops;
4872 struct net *net = info->net;
4873 struct nft_set_desc desc;
4874 struct nft_table *table;
4875 unsigned char *udata;
4876 struct nft_set *set;
4886 if (nla[NFTA_SET_TABLE] == NULL ||
4887 nla[NFTA_SET_NAME] == NULL ||
4888 nla[NFTA_SET_KEY_LEN] == NULL ||
4889 nla[NFTA_SET_ID] == NULL)
4892 memset(&desc, 0, sizeof(desc));
4894 desc.ktype = NFT_DATA_VALUE;
4895 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4896 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4897 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4901 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4902 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4906 if (nla[NFTA_SET_FLAGS] != NULL) {
4907 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4908 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4909 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4910 NFT_SET_MAP | NFT_SET_EVAL |
4911 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4913 /* Only one of these operations is supported */
4914 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4915 (NFT_SET_MAP | NFT_SET_OBJECT))
4917 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4918 (NFT_SET_EVAL | NFT_SET_OBJECT))
4923 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4924 if (!(flags & NFT_SET_MAP))
4927 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4928 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4929 desc.dtype != NFT_DATA_VERDICT)
4932 if (desc.dtype != NFT_DATA_VERDICT) {
4933 if (nla[NFTA_SET_DATA_LEN] == NULL)
4935 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4936 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4939 desc.dlen = sizeof(struct nft_verdict);
4940 } else if (flags & NFT_SET_MAP)
4943 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4944 if (!(flags & NFT_SET_OBJECT))
4947 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4948 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4949 desc.objtype > NFT_OBJECT_MAX)
4951 } else if (flags & NFT_SET_OBJECT)
4954 desc.objtype = NFT_OBJECT_UNSPEC;
4957 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4958 if (!(flags & NFT_SET_TIMEOUT))
4961 if (flags & NFT_SET_ANONYMOUS)
4964 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4969 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4970 if (!(flags & NFT_SET_TIMEOUT))
4973 if (flags & NFT_SET_ANONYMOUS)
4976 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4979 desc.policy = NFT_SET_POL_PERFORMANCE;
4980 if (nla[NFTA_SET_POLICY] != NULL)
4981 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4983 if (nla[NFTA_SET_DESC] != NULL) {
4984 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4988 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4990 } else if (flags & NFT_SET_CONCAT) {
4994 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4997 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4998 NETLINK_CB(skb).portid);
4999 if (IS_ERR(table)) {
5000 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5001 return PTR_ERR(table);
5004 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5006 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
5008 if (PTR_ERR(set) != -ENOENT) {
5009 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5010 return PTR_ERR(set);
5013 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
5015 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
5016 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5019 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
5022 if (nft_set_is_anonymous(set))
5025 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
5030 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
5031 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5035 for (i = 0; i < num_exprs; i++)
5036 nft_expr_destroy(&ctx, exprs[i]);
5041 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5044 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5047 ops = nft_select_set_ops(&ctx, nla, &desc);
5049 return PTR_ERR(ops);
5052 if (nla[NFTA_SET_USERDATA])
5053 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5056 if (ops->privsize != NULL)
5057 size = ops->privsize(nla, &desc);
5058 alloc_size = sizeof(*set) + size + udlen;
5059 if (alloc_size < size || alloc_size > INT_MAX)
5062 if (!nft_use_inc(&table->use))
5065 set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5071 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5077 err = nf_tables_set_alloc_name(&ctx, set, name);
5084 udata = set->data + size;
5085 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5088 INIT_LIST_HEAD(&set->bindings);
5089 INIT_LIST_HEAD(&set->catchall_list);
5090 refcount_set(&set->refs, 1);
5092 write_pnet(&set->net, net);
5094 set->ktype = desc.ktype;
5095 set->klen = desc.klen;
5096 set->dtype = desc.dtype;
5097 set->objtype = desc.objtype;
5098 set->dlen = desc.dlen;
5100 set->size = desc.size;
5101 set->policy = desc.policy;
5104 set->timeout = desc.timeout;
5105 set->gc_int = desc.gc_int;
5107 set->field_count = desc.field_count;
5108 for (i = 0; i < desc.field_count; i++)
5109 set->field_len[i] = desc.field_len[i];
5111 err = ops->init(set, &desc, nla);
5115 err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5117 goto err_set_destroy;
5119 set->num_exprs = num_exprs;
5120 set->handle = nf_tables_alloc_handle(table);
5121 INIT_LIST_HEAD(&set->pending_update);
5123 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5125 goto err_set_expr_alloc;
5127 list_add_tail_rcu(&set->list, &table->sets);
5132 for (i = 0; i < set->num_exprs; i++)
5133 nft_expr_destroy(&ctx, set->exprs[i]);
5135 ops->destroy(&ctx, set);
5141 nft_use_dec_restore(&table->use);
5146 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5147 struct nft_set *set)
5149 struct nft_set_elem_catchall *next, *catchall;
5151 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5152 list_del_rcu(&catchall->list);
5153 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5154 kfree_rcu(catchall, rcu);
5158 static void nft_set_put(struct nft_set *set)
5160 if (refcount_dec_and_test(&set->refs)) {
5166 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5170 if (WARN_ON(set->use > 0))
5173 for (i = 0; i < set->num_exprs; i++)
5174 nft_expr_destroy(ctx, set->exprs[i]);
5176 set->ops->destroy(ctx, set);
5177 nft_set_catchall_destroy(ctx, set);
5181 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5182 const struct nlattr * const nla[])
5184 struct netlink_ext_ack *extack = info->extack;
5185 u8 genmask = nft_genmask_next(info->net);
5186 u8 family = info->nfmsg->nfgen_family;
5187 struct net *net = info->net;
5188 const struct nlattr *attr;
5189 struct nft_table *table;
5190 struct nft_set *set;
5193 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5194 return -EAFNOSUPPORT;
5196 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5197 genmask, NETLINK_CB(skb).portid);
5198 if (IS_ERR(table)) {
5199 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5200 return PTR_ERR(table);
5203 if (nla[NFTA_SET_HANDLE]) {
5204 attr = nla[NFTA_SET_HANDLE];
5205 set = nft_set_lookup_byhandle(table, attr, genmask);
5207 attr = nla[NFTA_SET_NAME];
5208 set = nft_set_lookup(table, attr, genmask);
5212 if (PTR_ERR(set) == -ENOENT &&
5213 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5216 NL_SET_BAD_ATTR(extack, attr);
5217 return PTR_ERR(set);
5220 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5221 atomic_read(&set->nelems) > 0)) {
5222 NL_SET_BAD_ATTR(extack, attr);
5226 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5228 return nft_delset(&ctx, set);
5231 static int nft_validate_register_store(const struct nft_ctx *ctx,
5232 enum nft_registers reg,
5233 const struct nft_data *data,
5234 enum nft_data_types type,
5237 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5238 struct nft_set *set,
5239 struct nft_set_elem *elem)
5241 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5242 enum nft_registers dreg;
5244 dreg = nft_type_to_reg(set->dtype);
5245 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5246 set->dtype == NFT_DATA_VERDICT ?
5247 NFT_DATA_VERDICT : NFT_DATA_VALUE,
5251 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5252 struct nft_set *set,
5253 const struct nft_set_iter *iter,
5254 struct nft_set_elem *elem)
5256 return nft_setelem_data_validate(ctx, set, elem);
5259 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5260 struct nft_set *set)
5262 u8 genmask = nft_genmask_next(ctx->net);
5263 struct nft_set_elem_catchall *catchall;
5264 struct nft_set_elem elem;
5265 struct nft_set_ext *ext;
5268 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5269 ext = nft_set_elem_ext(set, catchall->elem);
5270 if (!nft_set_elem_active(ext, genmask))
5273 elem.priv = catchall->elem;
5274 ret = nft_setelem_data_validate(ctx, set, &elem);
5282 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5283 struct nft_set_binding *binding)
5285 struct nft_set_binding *i;
5286 struct nft_set_iter iter;
5288 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5291 if (binding->flags & NFT_SET_MAP) {
5292 /* If the set is already bound to the same chain all
5293 * jumps are already validated for that chain.
5295 list_for_each_entry(i, &set->bindings, list) {
5296 if (i->flags & NFT_SET_MAP &&
5297 i->chain == binding->chain)
5301 iter.genmask = nft_genmask_next(ctx->net);
5305 iter.fn = nf_tables_bind_check_setelem;
5307 set->ops->walk(ctx, set, &iter);
5309 iter.err = nft_set_catchall_bind_check(ctx, set);
5315 if (!nft_use_inc(&set->use))
5318 binding->chain = ctx->chain;
5319 list_add_tail_rcu(&binding->list, &set->bindings);
5320 nft_set_trans_bind(ctx, set);
5324 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5326 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5327 struct nft_set_binding *binding, bool event)
5329 list_del_rcu(&binding->list);
5331 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5332 list_del_rcu(&set->list);
5334 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5339 static void nft_setelem_data_activate(const struct net *net,
5340 const struct nft_set *set,
5341 struct nft_set_elem *elem);
5343 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5344 struct nft_set *set,
5345 const struct nft_set_iter *iter,
5346 struct nft_set_elem *elem)
5348 nft_setelem_data_activate(ctx->net, set, elem);
5353 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5354 struct nft_set *set)
5356 u8 genmask = nft_genmask_next(ctx->net);
5357 struct nft_set_elem_catchall *catchall;
5358 struct nft_set_elem elem;
5359 struct nft_set_ext *ext;
5361 list_for_each_entry(catchall, &set->catchall_list, list) {
5362 ext = nft_set_elem_ext(set, catchall->elem);
5363 if (!nft_set_elem_active(ext, genmask))
5366 elem.priv = catchall->elem;
5367 nft_setelem_data_activate(ctx->net, set, &elem);
5372 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5374 struct nft_set_iter iter = {
5375 .genmask = nft_genmask_next(ctx->net),
5376 .fn = nft_mapelem_activate,
5379 set->ops->walk(ctx, set, &iter);
5380 WARN_ON_ONCE(iter.err);
5382 nft_map_catchall_activate(ctx, set);
5385 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5387 if (nft_set_is_anonymous(set)) {
5388 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5389 nft_map_activate(ctx, set);
5391 nft_clear(ctx->net, set);
5394 nft_use_inc_restore(&set->use);
5396 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5398 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5399 struct nft_set_binding *binding,
5400 enum nft_trans_phase phase)
5403 case NFT_TRANS_PREPARE_ERROR:
5404 nft_set_trans_unbind(ctx, set);
5405 if (nft_set_is_anonymous(set))
5406 nft_deactivate_next(ctx->net, set);
5408 list_del_rcu(&binding->list);
5410 nft_use_dec(&set->use);
5412 case NFT_TRANS_PREPARE:
5413 if (nft_set_is_anonymous(set)) {
5414 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5415 nft_map_deactivate(ctx, set);
5417 nft_deactivate_next(ctx->net, set);
5419 nft_use_dec(&set->use);
5421 case NFT_TRANS_ABORT:
5422 case NFT_TRANS_RELEASE:
5423 if (nft_set_is_anonymous(set) &&
5424 set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5425 nft_map_deactivate(ctx, set);
5427 nft_use_dec(&set->use);
5430 nf_tables_unbind_set(ctx, set, binding,
5431 phase == NFT_TRANS_COMMIT);
5434 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5436 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5438 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5439 nft_set_destroy(ctx, set);
5441 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5443 const struct nft_set_ext_type nft_set_ext_types[] = {
5444 [NFT_SET_EXT_KEY] = {
5445 .align = __alignof__(u32),
5447 [NFT_SET_EXT_DATA] = {
5448 .align = __alignof__(u32),
5450 [NFT_SET_EXT_EXPRESSIONS] = {
5451 .align = __alignof__(struct nft_set_elem_expr),
5453 [NFT_SET_EXT_OBJREF] = {
5454 .len = sizeof(struct nft_object *),
5455 .align = __alignof__(struct nft_object *),
5457 [NFT_SET_EXT_FLAGS] = {
5459 .align = __alignof__(u8),
5461 [NFT_SET_EXT_TIMEOUT] = {
5463 .align = __alignof__(u64),
5465 [NFT_SET_EXT_EXPIRATION] = {
5467 .align = __alignof__(u64),
5469 [NFT_SET_EXT_USERDATA] = {
5470 .len = sizeof(struct nft_userdata),
5471 .align = __alignof__(struct nft_userdata),
5473 [NFT_SET_EXT_KEY_END] = {
5474 .align = __alignof__(u32),
5482 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5483 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
5484 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
5485 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
5486 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
5487 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
5488 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
5489 .len = NFT_USERDATA_MAXLEN },
5490 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
5491 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
5492 .len = NFT_OBJ_MAXNAMELEN - 1 },
5493 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
5494 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
5497 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5498 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
5499 .len = NFT_TABLE_MAXNAMELEN - 1 },
5500 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
5501 .len = NFT_SET_MAXNAMELEN - 1 },
5502 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
5503 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
5506 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5507 const struct nft_set *set,
5508 const struct nft_set_ext *ext,
5511 struct nft_set_elem_expr *elem_expr;
5512 u32 size, num_exprs = 0;
5513 struct nft_expr *expr;
5514 struct nlattr *nest;
5516 elem_expr = nft_set_ext_expr(ext);
5517 nft_setelem_expr_foreach(expr, elem_expr, size)
5520 if (num_exprs == 1) {
5521 expr = nft_setelem_expr_at(elem_expr, 0);
5522 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5526 } else if (num_exprs > 1) {
5527 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5529 goto nla_put_failure;
5531 nft_setelem_expr_foreach(expr, elem_expr, size) {
5532 expr = nft_setelem_expr_at(elem_expr, size);
5533 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5534 goto nla_put_failure;
5536 nla_nest_end(skb, nest);
5544 static int nf_tables_fill_setelem(struct sk_buff *skb,
5545 const struct nft_set *set,
5546 const struct nft_set_elem *elem,
5549 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5550 unsigned char *b = skb_tail_pointer(skb);
5551 struct nlattr *nest;
5554 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5556 goto nla_put_failure;
5558 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5559 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5560 NFT_DATA_VALUE, set->klen) < 0)
5561 goto nla_put_failure;
5563 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5564 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5565 NFT_DATA_VALUE, set->klen) < 0)
5566 goto nla_put_failure;
5568 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5569 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5570 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5572 goto nla_put_failure;
5574 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5575 nft_set_elem_expr_dump(skb, set, ext, reset))
5576 goto nla_put_failure;
5578 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5579 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5580 (*nft_set_ext_obj(ext))->key.name) < 0)
5581 goto nla_put_failure;
5583 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5584 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5585 htonl(*nft_set_ext_flags(ext))))
5586 goto nla_put_failure;
5588 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) {
5589 timeout = *nft_set_ext_timeout(ext);
5590 if (nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5591 nf_jiffies64_to_msecs(timeout),
5593 goto nla_put_failure;
5594 } else if (set->flags & NFT_SET_TIMEOUT) {
5595 timeout = READ_ONCE(set->timeout);
5598 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5599 u64 expires, now = get_jiffies_64();
5601 expires = *nft_set_ext_expiration(ext);
5602 if (time_before64(now, expires))
5607 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5608 nf_jiffies64_to_msecs(expires),
5610 goto nla_put_failure;
5613 *nft_set_ext_expiration(ext) = now + timeout;
5616 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5617 struct nft_userdata *udata;
5619 udata = nft_set_ext_userdata(ext);
5620 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5621 udata->len + 1, udata->data))
5622 goto nla_put_failure;
5625 nla_nest_end(skb, nest);
5633 struct nft_set_dump_args {
5634 const struct netlink_callback *cb;
5635 struct nft_set_iter iter;
5636 struct sk_buff *skb;
5640 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5641 struct nft_set *set,
5642 const struct nft_set_iter *iter,
5643 struct nft_set_elem *elem)
5645 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5646 struct nft_set_dump_args *args;
5648 if (nft_set_elem_expired(ext))
5651 args = container_of(iter, struct nft_set_dump_args, iter);
5652 return nf_tables_fill_setelem(args->skb, set, elem, args->reset);
5655 static void audit_log_nft_set_reset(const struct nft_table *table,
5656 unsigned int base_seq,
5657 unsigned int nentries)
5659 char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
5661 audit_log_nfcfg(buf, table->family, nentries,
5662 AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
5666 struct nft_set_dump_ctx {
5667 const struct nft_set *set;
5671 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5672 const struct nft_set *set, bool reset,
5673 unsigned int base_seq)
5675 struct nft_set_elem_catchall *catchall;
5676 u8 genmask = nft_genmask_cur(net);
5677 struct nft_set_elem elem;
5678 struct nft_set_ext *ext;
5681 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5682 ext = nft_set_elem_ext(set, catchall->elem);
5683 if (!nft_set_elem_active(ext, genmask) ||
5684 nft_set_elem_expired(ext))
5687 elem.priv = catchall->elem;
5688 ret = nf_tables_fill_setelem(skb, set, &elem, reset);
5690 audit_log_nft_set_reset(set->table, base_seq, 1);
5697 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5699 struct nft_set_dump_ctx *dump_ctx = cb->data;
5700 struct net *net = sock_net(skb->sk);
5701 struct nftables_pernet *nft_net;
5702 struct nft_table *table;
5703 struct nft_set *set;
5704 struct nft_set_dump_args args;
5705 bool set_found = false;
5706 struct nlmsghdr *nlh;
5707 struct nlattr *nest;
5713 nft_net = nft_pernet(net);
5714 cb->seq = READ_ONCE(nft_net->base_seq);
5716 list_for_each_entry_rcu(table, &nft_net->tables, list) {
5717 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5718 dump_ctx->ctx.family != table->family)
5721 if (table != dump_ctx->ctx.table)
5724 list_for_each_entry_rcu(set, &table->sets, list) {
5725 if (set == dump_ctx->set) {
5738 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5739 portid = NETLINK_CB(cb->skb).portid;
5740 seq = cb->nlh->nlmsg_seq;
5742 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5743 table->family, NFNETLINK_V0, nft_base_seq(net));
5745 goto nla_put_failure;
5747 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5748 goto nla_put_failure;
5749 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5750 goto nla_put_failure;
5752 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5754 goto nla_put_failure;
5756 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5762 args.iter.genmask = nft_genmask_cur(net);
5763 args.iter.skip = cb->args[0];
5764 args.iter.count = 0;
5766 args.iter.fn = nf_tables_dump_setelem;
5767 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5769 if (!args.iter.err && args.iter.count == cb->args[0])
5770 args.iter.err = nft_set_catchall_dump(net, skb, set,
5772 nla_nest_end(skb, nest);
5773 nlmsg_end(skb, nlh);
5775 if (reset && args.iter.count > args.iter.skip)
5776 audit_log_nft_set_reset(table, cb->seq,
5777 args.iter.count - args.iter.skip);
5781 if (args.iter.err && args.iter.err != -EMSGSIZE)
5782 return args.iter.err;
5783 if (args.iter.count == cb->args[0])
5786 cb->args[0] = args.iter.count;
5794 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5796 struct nft_set_dump_ctx *dump_ctx = cb->data;
5798 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5800 return cb->data ? 0 : -ENOMEM;
5803 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5809 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5810 const struct nft_ctx *ctx, u32 seq,
5811 u32 portid, int event, u16 flags,
5812 const struct nft_set *set,
5813 const struct nft_set_elem *elem,
5816 struct nlmsghdr *nlh;
5817 struct nlattr *nest;
5820 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5821 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5822 NFNETLINK_V0, nft_base_seq(ctx->net));
5824 goto nla_put_failure;
5826 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5827 goto nla_put_failure;
5828 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5829 goto nla_put_failure;
5831 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5833 goto nla_put_failure;
5835 err = nf_tables_fill_setelem(skb, set, elem, reset);
5837 goto nla_put_failure;
5839 nla_nest_end(skb, nest);
5841 nlmsg_end(skb, nlh);
5845 nlmsg_trim(skb, nlh);
5849 static int nft_setelem_parse_flags(const struct nft_set *set,
5850 const struct nlattr *attr, u32 *flags)
5855 *flags = ntohl(nla_get_be32(attr));
5856 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5858 if (!(set->flags & NFT_SET_INTERVAL) &&
5859 *flags & NFT_SET_ELEM_INTERVAL_END)
5861 if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5862 (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5868 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5869 struct nft_data *key, struct nlattr *attr)
5871 struct nft_data_desc desc = {
5872 .type = NFT_DATA_VALUE,
5873 .size = NFT_DATA_VALUE_MAXLEN,
5877 return nft_data_init(ctx, key, &desc, attr);
5880 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5881 struct nft_data_desc *desc,
5882 struct nft_data *data,
5883 struct nlattr *attr)
5887 if (set->dtype == NFT_DATA_VERDICT)
5888 dtype = NFT_DATA_VERDICT;
5890 dtype = NFT_DATA_VALUE;
5893 desc->size = NFT_DATA_VALUE_MAXLEN;
5894 desc->len = set->dlen;
5895 desc->flags = NFT_DATA_DESC_SETELEM;
5897 return nft_data_init(ctx, data, desc, attr);
5900 static void *nft_setelem_catchall_get(const struct net *net,
5901 const struct nft_set *set)
5903 struct nft_set_elem_catchall *catchall;
5904 u8 genmask = nft_genmask_cur(net);
5905 struct nft_set_ext *ext;
5908 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5909 ext = nft_set_elem_ext(set, catchall->elem);
5910 if (!nft_set_elem_active(ext, genmask) ||
5911 nft_set_elem_expired(ext))
5914 priv = catchall->elem;
5921 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5922 struct nft_set_elem *elem, u32 flags)
5926 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5927 priv = set->ops->get(ctx->net, set, elem, flags);
5929 return PTR_ERR(priv);
5931 priv = nft_setelem_catchall_get(ctx->net, set);
5940 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5941 const struct nlattr *attr, bool reset)
5943 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5944 struct nft_set_elem elem;
5945 struct sk_buff *skb;
5949 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5950 nft_set_elem_policy, NULL);
5954 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5958 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5961 if (nla[NFTA_SET_ELEM_KEY]) {
5962 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5963 nla[NFTA_SET_ELEM_KEY]);
5968 if (nla[NFTA_SET_ELEM_KEY_END]) {
5969 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5970 nla[NFTA_SET_ELEM_KEY_END]);
5975 err = nft_setelem_get(ctx, set, &elem, flags);
5980 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5984 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5985 NFT_MSG_NEWSETELEM, 0, set, &elem,
5988 goto err_fill_setelem;
5990 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5997 /* called with rcu_read_lock held */
5998 static int nf_tables_getsetelem(struct sk_buff *skb,
5999 const struct nfnl_info *info,
6000 const struct nlattr * const nla[])
6002 struct netlink_ext_ack *extack = info->extack;
6003 u8 genmask = nft_genmask_cur(info->net);
6004 u8 family = info->nfmsg->nfgen_family;
6005 int rem, err = 0, nelems = 0;
6006 struct net *net = info->net;
6007 struct nft_table *table;
6008 struct nft_set *set;
6009 struct nlattr *attr;
6013 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6015 if (IS_ERR(table)) {
6016 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6017 return PTR_ERR(table);
6020 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6022 return PTR_ERR(set);
6024 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6026 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6027 struct netlink_dump_control c = {
6028 .start = nf_tables_dump_set_start,
6029 .dump = nf_tables_dump_set,
6030 .done = nf_tables_dump_set_done,
6031 .module = THIS_MODULE,
6033 struct nft_set_dump_ctx dump_ctx = {
6039 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6042 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6045 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
6048 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6049 err = nft_get_set_elem(&ctx, set, attr, reset);
6051 NL_SET_BAD_ATTR(extack, attr);
6058 audit_log_nft_set_reset(table, nft_pernet(net)->base_seq,
6064 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
6065 const struct nft_set *set,
6066 const struct nft_set_elem *elem,
6069 struct nftables_pernet *nft_net;
6070 struct net *net = ctx->net;
6071 u32 portid = ctx->portid;
6072 struct sk_buff *skb;
6076 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6079 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6083 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6084 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6086 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6093 nft_net = nft_pernet(net);
6094 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6097 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6100 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6102 struct nft_set *set)
6104 struct nft_trans *trans;
6106 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6110 nft_trans_elem_set(trans) = set;
6114 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6115 const struct nft_set *set,
6116 const struct nlattr *attr)
6118 struct nft_expr *expr;
6121 expr = nft_expr_init(ctx, attr);
6126 if (expr->ops->type->flags & NFT_EXPR_GC) {
6127 if (set->flags & NFT_SET_TIMEOUT)
6128 goto err_set_elem_expr;
6129 if (!set->ops->gc_init)
6130 goto err_set_elem_expr;
6131 set->ops->gc_init(set);
6137 nft_expr_destroy(ctx, expr);
6138 return ERR_PTR(err);
6141 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6143 len += nft_set_ext_types[id].len;
6144 if (len > tmpl->ext_len[id] ||
6151 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6152 void *to, const void *from, u32 len)
6154 if (nft_set_ext_check(tmpl, id, len) < 0)
6157 memcpy(to, from, len);
6162 void *nft_set_elem_init(const struct nft_set *set,
6163 const struct nft_set_ext_tmpl *tmpl,
6164 const u32 *key, const u32 *key_end,
6165 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
6167 struct nft_set_ext *ext;
6170 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6172 return ERR_PTR(-ENOMEM);
6174 ext = nft_set_elem_ext(set, elem);
6175 nft_set_ext_init(ext, tmpl);
6177 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6178 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6179 nft_set_ext_key(ext), key, set->klen) < 0)
6182 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6183 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6184 nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6187 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6188 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6189 nft_set_ext_data(ext), data, set->dlen) < 0)
6192 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6193 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6194 if (expiration == 0)
6195 *nft_set_ext_expiration(ext) += timeout;
6197 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6198 *nft_set_ext_timeout(ext) = timeout;
6205 return ERR_PTR(-EINVAL);
6208 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6209 struct nft_expr *expr)
6211 if (expr->ops->destroy_clone) {
6212 expr->ops->destroy_clone(ctx, expr);
6213 module_put(expr->ops->type->owner);
6215 nf_tables_expr_destroy(ctx, expr);
6219 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6220 struct nft_set_elem_expr *elem_expr)
6222 struct nft_expr *expr;
6225 nft_setelem_expr_foreach(expr, elem_expr, size)
6226 __nft_set_elem_expr_destroy(ctx, expr);
6229 /* Drop references and destroy. Called from gc, dynset and abort path. */
6230 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
6233 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6234 struct nft_ctx ctx = {
6235 .net = read_pnet(&set->net),
6236 .family = set->table->family,
6239 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6240 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6241 nft_data_release(nft_set_ext_data(ext), set->dtype);
6242 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6243 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6245 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6246 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6249 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6251 /* Destroy element. References have been already dropped in the preparation
6252 * path via nft_setelem_data_deactivate().
6254 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6255 const struct nft_set *set, void *elem)
6257 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6259 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6260 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6265 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6266 struct nft_expr *expr_array[])
6268 struct nft_expr *expr;
6271 for (i = 0; i < set->num_exprs; i++) {
6272 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6276 err = nft_expr_clone(expr, set->exprs[i]);
6281 expr_array[i] = expr;
6287 for (k = i - 1; k >= 0; k--)
6288 nft_expr_destroy(ctx, expr_array[k]);
6293 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6294 const struct nft_set_ext_tmpl *tmpl,
6295 const struct nft_set_ext *ext,
6296 struct nft_expr *expr_array[],
6299 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6300 u32 len = sizeof(struct nft_set_elem_expr);
6301 struct nft_expr *expr;
6307 for (i = 0; i < num_exprs; i++)
6308 len += expr_array[i]->ops->size;
6310 if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6313 for (i = 0; i < num_exprs; i++) {
6314 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6315 err = nft_expr_clone(expr, expr_array[i]);
6317 goto err_elem_expr_setup;
6319 elem_expr->size += expr_array[i]->ops->size;
6320 nft_expr_destroy(ctx, expr_array[i]);
6321 expr_array[i] = NULL;
6326 err_elem_expr_setup:
6327 for (; i < num_exprs; i++) {
6328 nft_expr_destroy(ctx, expr_array[i]);
6329 expr_array[i] = NULL;
6335 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6336 const struct nft_set *set)
6338 struct nft_set_elem_catchall *catchall;
6339 u8 genmask = nft_genmask_cur(net);
6340 struct nft_set_ext *ext;
6342 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6343 ext = nft_set_elem_ext(set, catchall->elem);
6344 if (nft_set_elem_active(ext, genmask) &&
6345 !nft_set_elem_expired(ext) &&
6346 !nft_set_elem_is_dead(ext))
6352 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6354 static int nft_setelem_catchall_insert(const struct net *net,
6355 struct nft_set *set,
6356 const struct nft_set_elem *elem,
6357 struct nft_set_ext **pext)
6359 struct nft_set_elem_catchall *catchall;
6360 u8 genmask = nft_genmask_next(net);
6361 struct nft_set_ext *ext;
6363 list_for_each_entry(catchall, &set->catchall_list, list) {
6364 ext = nft_set_elem_ext(set, catchall->elem);
6365 if (nft_set_elem_active(ext, genmask)) {
6371 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6375 catchall->elem = elem->priv;
6376 list_add_tail_rcu(&catchall->list, &set->catchall_list);
6381 static int nft_setelem_insert(const struct net *net,
6382 struct nft_set *set,
6383 const struct nft_set_elem *elem,
6384 struct nft_set_ext **ext, unsigned int flags)
6388 if (flags & NFT_SET_ELEM_CATCHALL)
6389 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6391 ret = set->ops->insert(net, set, elem, ext);
6396 static bool nft_setelem_is_catchall(const struct nft_set *set,
6397 const struct nft_set_elem *elem)
6399 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6401 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6402 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6408 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6409 struct nft_set_elem *elem)
6411 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6413 if (nft_setelem_is_catchall(set, elem)) {
6414 nft_set_elem_change_active(net, set, ext);
6416 set->ops->activate(net, set, elem);
6420 static int nft_setelem_catchall_deactivate(const struct net *net,
6421 struct nft_set *set,
6422 struct nft_set_elem *elem)
6424 struct nft_set_elem_catchall *catchall;
6425 struct nft_set_ext *ext;
6427 list_for_each_entry(catchall, &set->catchall_list, list) {
6428 ext = nft_set_elem_ext(set, catchall->elem);
6429 if (!nft_is_active(net, ext))
6433 elem->priv = catchall->elem;
6434 nft_set_elem_change_active(net, set, ext);
6441 static int __nft_setelem_deactivate(const struct net *net,
6442 struct nft_set *set,
6443 struct nft_set_elem *elem)
6447 priv = set->ops->deactivate(net, set, elem);
6458 static int nft_setelem_deactivate(const struct net *net,
6459 struct nft_set *set,
6460 struct nft_set_elem *elem, u32 flags)
6464 if (flags & NFT_SET_ELEM_CATCHALL)
6465 ret = nft_setelem_catchall_deactivate(net, set, elem);
6467 ret = __nft_setelem_deactivate(net, set, elem);
6472 static void nft_setelem_catchall_remove(const struct net *net,
6473 const struct nft_set *set,
6474 const struct nft_set_elem *elem)
6476 struct nft_set_elem_catchall *catchall, *next;
6478 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6479 if (catchall->elem == elem->priv) {
6480 list_del_rcu(&catchall->list);
6481 kfree_rcu(catchall, rcu);
6487 static void nft_setelem_remove(const struct net *net,
6488 const struct nft_set *set,
6489 const struct nft_set_elem *elem)
6491 if (nft_setelem_is_catchall(set, elem))
6492 nft_setelem_catchall_remove(net, set, elem);
6494 set->ops->remove(net, set, elem);
6497 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6498 struct nlattr **nla, u32 flags)
6500 if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6501 (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6502 if (flags & NFT_SET_ELEM_INTERVAL_END)
6505 if (nla[NFTA_SET_ELEM_KEY_END] &&
6506 flags & NFT_SET_ELEM_CATCHALL)
6509 if (nla[NFTA_SET_ELEM_KEY_END])
6516 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6517 const struct nlattr *attr, u32 nlmsg_flags)
6519 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6520 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6521 u8 genmask = nft_genmask_next(ctx->net);
6522 u32 flags = 0, size = 0, num_exprs = 0;
6523 struct nft_set_ext_tmpl tmpl;
6524 struct nft_set_ext *ext, *ext2;
6525 struct nft_set_elem elem;
6526 struct nft_set_binding *binding;
6527 struct nft_object *obj = NULL;
6528 struct nft_userdata *udata;
6529 struct nft_data_desc desc;
6530 enum nft_registers dreg;
6531 struct nft_trans *trans;
6537 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6538 nft_set_elem_policy, NULL);
6542 nft_set_ext_prepare(&tmpl);
6544 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6548 if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6549 (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6553 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6558 if (set->flags & NFT_SET_MAP) {
6559 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6560 !(flags & NFT_SET_ELEM_INTERVAL_END))
6563 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6567 if (set->flags & NFT_SET_OBJECT) {
6568 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6569 !(flags & NFT_SET_ELEM_INTERVAL_END))
6572 if (nla[NFTA_SET_ELEM_OBJREF])
6576 if (!nft_setelem_valid_key_end(set, nla, flags))
6579 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6580 (nla[NFTA_SET_ELEM_DATA] ||
6581 nla[NFTA_SET_ELEM_OBJREF] ||
6582 nla[NFTA_SET_ELEM_TIMEOUT] ||
6583 nla[NFTA_SET_ELEM_EXPIRATION] ||
6584 nla[NFTA_SET_ELEM_USERDATA] ||
6585 nla[NFTA_SET_ELEM_EXPR] ||
6586 nla[NFTA_SET_ELEM_KEY_END] ||
6587 nla[NFTA_SET_ELEM_EXPRESSIONS]))
6591 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6592 if (!(set->flags & NFT_SET_TIMEOUT))
6594 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6598 } else if (set->flags & NFT_SET_TIMEOUT &&
6599 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6600 timeout = READ_ONCE(set->timeout);
6604 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6605 if (!(set->flags & NFT_SET_TIMEOUT))
6607 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6613 if (nla[NFTA_SET_ELEM_EXPR]) {
6614 struct nft_expr *expr;
6616 if (set->num_exprs && set->num_exprs != 1)
6619 expr = nft_set_elem_expr_alloc(ctx, set,
6620 nla[NFTA_SET_ELEM_EXPR]);
6622 return PTR_ERR(expr);
6624 expr_array[0] = expr;
6627 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6629 goto err_set_elem_expr;
6631 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6632 struct nft_expr *expr;
6637 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6638 if (i == NFT_SET_EXPR_MAX ||
6639 (set->num_exprs && set->num_exprs == i)) {
6641 goto err_set_elem_expr;
6643 if (nla_type(tmp) != NFTA_LIST_ELEM) {
6645 goto err_set_elem_expr;
6647 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6649 err = PTR_ERR(expr);
6650 goto err_set_elem_expr;
6652 expr_array[i] = expr;
6655 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6657 goto err_set_elem_expr;
6661 if (set->num_exprs && set->num_exprs != i) {
6663 goto err_set_elem_expr;
6665 } else if (set->num_exprs > 0 &&
6666 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6667 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6669 goto err_set_elem_expr_clone;
6671 num_exprs = set->num_exprs;
6674 if (nla[NFTA_SET_ELEM_KEY]) {
6675 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6676 nla[NFTA_SET_ELEM_KEY]);
6678 goto err_set_elem_expr;
6680 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6685 if (nla[NFTA_SET_ELEM_KEY_END]) {
6686 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6687 nla[NFTA_SET_ELEM_KEY_END]);
6691 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6693 goto err_parse_key_end;
6697 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6699 goto err_parse_key_end;
6701 if (timeout != READ_ONCE(set->timeout)) {
6702 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6704 goto err_parse_key_end;
6709 for (i = 0; i < num_exprs; i++)
6710 size += expr_array[i]->ops->size;
6712 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6713 sizeof(struct nft_set_elem_expr) + size);
6715 goto err_parse_key_end;
6718 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6719 obj = nft_obj_lookup(ctx->net, ctx->table,
6720 nla[NFTA_SET_ELEM_OBJREF],
6721 set->objtype, genmask);
6725 goto err_parse_key_end;
6728 if (!nft_use_inc(&obj->use)) {
6731 goto err_parse_key_end;
6734 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6736 goto err_parse_key_end;
6739 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6740 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6741 nla[NFTA_SET_ELEM_DATA]);
6743 goto err_parse_key_end;
6745 dreg = nft_type_to_reg(set->dtype);
6746 list_for_each_entry(binding, &set->bindings, list) {
6747 struct nft_ctx bind_ctx = {
6749 .family = ctx->family,
6750 .table = ctx->table,
6751 .chain = (struct nft_chain *)binding->chain,
6754 if (!(binding->flags & NFT_SET_MAP))
6757 err = nft_validate_register_store(&bind_ctx, dreg,
6759 desc.type, desc.len);
6761 goto err_parse_data;
6763 if (desc.type == NFT_DATA_VERDICT &&
6764 (elem.data.val.verdict.code == NFT_GOTO ||
6765 elem.data.val.verdict.code == NFT_JUMP))
6766 nft_validate_state_update(ctx->table,
6770 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6772 goto err_parse_data;
6775 /* The full maximum length of userdata can exceed the maximum
6776 * offset value (U8_MAX) for following extensions, therefor it
6777 * must be the last extension added.
6780 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6781 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6783 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6786 goto err_parse_data;
6790 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6791 elem.key_end.val.data, elem.data.val.data,
6792 timeout, expiration, GFP_KERNEL_ACCOUNT);
6793 if (IS_ERR(elem.priv)) {
6794 err = PTR_ERR(elem.priv);
6795 goto err_parse_data;
6798 ext = nft_set_elem_ext(set, elem.priv);
6800 *nft_set_ext_flags(ext) = flags;
6803 *nft_set_ext_obj(ext) = obj;
6806 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6810 udata = nft_set_ext_userdata(ext);
6811 udata->len = ulen - 1;
6812 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6814 err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6818 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6819 if (trans == NULL) {
6824 ext->genmask = nft_genmask_cur(ctx->net);
6826 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6828 if (err == -EEXIST) {
6829 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6830 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6831 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6832 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6833 goto err_element_clash;
6834 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6835 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6836 memcmp(nft_set_ext_data(ext),
6837 nft_set_ext_data(ext2), set->dlen) != 0) ||
6838 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6839 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6840 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6841 goto err_element_clash;
6842 else if (!(nlmsg_flags & NLM_F_EXCL))
6844 } else if (err == -ENOTEMPTY) {
6845 /* ENOTEMPTY reports overlapping between this element
6846 * and an existing one.
6850 goto err_element_clash;
6853 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6854 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
6856 if (!atomic_add_unless(&set->nelems, 1, max)) {
6862 nft_trans_elem(trans) = elem;
6863 nft_trans_commit_list_add_tail(ctx->net, trans);
6867 nft_setelem_remove(ctx->net, set, &elem);
6871 nf_tables_set_elem_destroy(ctx, set, elem.priv);
6873 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6874 nft_data_release(&elem.data.val, desc.type);
6877 nft_use_dec_restore(&obj->use);
6879 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6881 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6883 for (i = 0; i < num_exprs && expr_array[i]; i++)
6884 nft_expr_destroy(ctx, expr_array[i]);
6885 err_set_elem_expr_clone:
6889 static int nf_tables_newsetelem(struct sk_buff *skb,
6890 const struct nfnl_info *info,
6891 const struct nlattr * const nla[])
6893 struct netlink_ext_ack *extack = info->extack;
6894 u8 genmask = nft_genmask_next(info->net);
6895 u8 family = info->nfmsg->nfgen_family;
6896 struct net *net = info->net;
6897 const struct nlattr *attr;
6898 struct nft_table *table;
6899 struct nft_set *set;
6903 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6906 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6907 genmask, NETLINK_CB(skb).portid);
6908 if (IS_ERR(table)) {
6909 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6910 return PTR_ERR(table);
6913 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6914 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6916 return PTR_ERR(set);
6918 if (!list_empty(&set->bindings) &&
6919 (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
6922 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6924 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6925 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6927 NL_SET_BAD_ATTR(extack, attr);
6932 if (table->validate_state == NFT_VALIDATE_DO)
6933 return nft_table_validate(net, table);
6939 * nft_data_hold - hold a nft_data item
6941 * @data: struct nft_data to release
6942 * @type: type of data
6944 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6945 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6946 * NFT_GOTO verdicts. This function must be called on active data objects
6947 * from the second phase of the commit protocol.
6949 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6951 struct nft_chain *chain;
6953 if (type == NFT_DATA_VERDICT) {
6954 switch (data->verdict.code) {
6957 chain = data->verdict.chain;
6958 nft_use_inc_restore(&chain->use);
6964 static void nft_setelem_data_activate(const struct net *net,
6965 const struct nft_set *set,
6966 struct nft_set_elem *elem)
6968 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6970 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6971 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6972 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6973 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
6976 void nft_setelem_data_deactivate(const struct net *net,
6977 const struct nft_set *set,
6978 struct nft_set_elem *elem)
6980 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6982 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6983 nft_data_release(nft_set_ext_data(ext), set->dtype);
6984 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6985 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6988 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6989 const struct nlattr *attr)
6991 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6992 struct nft_set_ext_tmpl tmpl;
6993 struct nft_set_elem elem;
6994 struct nft_set_ext *ext;
6995 struct nft_trans *trans;
6999 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
7000 nft_set_elem_policy, NULL);
7004 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
7008 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
7011 if (!nft_setelem_valid_key_end(set, nla, flags))
7014 nft_set_ext_prepare(&tmpl);
7017 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
7022 if (nla[NFTA_SET_ELEM_KEY]) {
7023 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
7024 nla[NFTA_SET_ELEM_KEY]);
7028 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7033 if (nla[NFTA_SET_ELEM_KEY_END]) {
7034 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
7035 nla[NFTA_SET_ELEM_KEY_END]);
7039 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
7041 goto fail_elem_key_end;
7045 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7046 elem.key_end.val.data, NULL, 0, 0,
7047 GFP_KERNEL_ACCOUNT);
7048 if (IS_ERR(elem.priv)) {
7049 err = PTR_ERR(elem.priv);
7050 goto fail_elem_key_end;
7053 ext = nft_set_elem_ext(set, elem.priv);
7055 *nft_set_ext_flags(ext) = flags;
7057 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7061 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7065 nft_setelem_data_deactivate(ctx->net, set, &elem);
7067 nft_trans_elem(trans) = elem;
7068 nft_trans_commit_list_add_tail(ctx->net, trans);
7076 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7078 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7082 static int nft_setelem_flush(const struct nft_ctx *ctx,
7083 struct nft_set *set,
7084 const struct nft_set_iter *iter,
7085 struct nft_set_elem *elem)
7087 struct nft_trans *trans;
7090 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7091 sizeof(struct nft_trans_elem), GFP_ATOMIC);
7095 if (!set->ops->flush(ctx->net, set, elem->priv)) {
7101 nft_setelem_data_deactivate(ctx->net, set, elem);
7102 nft_trans_elem_set(trans) = set;
7103 nft_trans_elem(trans) = *elem;
7104 nft_trans_commit_list_add_tail(ctx->net, trans);
7112 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7113 struct nft_set *set,
7114 struct nft_set_elem *elem)
7116 struct nft_trans *trans;
7118 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7119 sizeof(struct nft_trans_elem), GFP_KERNEL);
7123 nft_setelem_data_deactivate(ctx->net, set, elem);
7124 nft_trans_elem_set(trans) = set;
7125 nft_trans_elem(trans) = *elem;
7126 nft_trans_commit_list_add_tail(ctx->net, trans);
7131 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7132 struct nft_set *set)
7134 u8 genmask = nft_genmask_next(ctx->net);
7135 struct nft_set_elem_catchall *catchall;
7136 struct nft_set_elem elem;
7137 struct nft_set_ext *ext;
7140 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7141 ext = nft_set_elem_ext(set, catchall->elem);
7142 if (!nft_set_elem_active(ext, genmask))
7145 elem.priv = catchall->elem;
7146 ret = __nft_set_catchall_flush(ctx, set, &elem);
7149 nft_set_elem_change_active(ctx->net, set, ext);
7155 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7157 struct nft_set_iter iter = {
7159 .fn = nft_setelem_flush,
7162 set->ops->walk(ctx, set, &iter);
7164 iter.err = nft_set_catchall_flush(ctx, set);
7169 static int nf_tables_delsetelem(struct sk_buff *skb,
7170 const struct nfnl_info *info,
7171 const struct nlattr * const nla[])
7173 struct netlink_ext_ack *extack = info->extack;
7174 u8 genmask = nft_genmask_next(info->net);
7175 u8 family = info->nfmsg->nfgen_family;
7176 struct net *net = info->net;
7177 const struct nlattr *attr;
7178 struct nft_table *table;
7179 struct nft_set *set;
7183 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7184 genmask, NETLINK_CB(skb).portid);
7185 if (IS_ERR(table)) {
7186 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7187 return PTR_ERR(table);
7190 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7192 return PTR_ERR(set);
7194 if (!list_empty(&set->bindings) &&
7195 (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
7198 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7200 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7201 return nft_set_flush(&ctx, set, genmask);
7203 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7204 err = nft_del_setelem(&ctx, set, attr);
7205 if (err == -ENOENT &&
7206 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7210 NL_SET_BAD_ATTR(extack, attr);
7222 * nft_register_obj- register nf_tables stateful object type
7223 * @obj_type: object type
7225 * Registers the object type for use with nf_tables. Returns zero on
7226 * success or a negative errno code otherwise.
7228 int nft_register_obj(struct nft_object_type *obj_type)
7230 if (obj_type->type == NFT_OBJECT_UNSPEC)
7233 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7234 list_add_rcu(&obj_type->list, &nf_tables_objects);
7235 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7238 EXPORT_SYMBOL_GPL(nft_register_obj);
7241 * nft_unregister_obj - unregister nf_tables object type
7242 * @obj_type: object type
7244 * Unregisters the object type for use with nf_tables.
7246 void nft_unregister_obj(struct nft_object_type *obj_type)
7248 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7249 list_del_rcu(&obj_type->list);
7250 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7252 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7254 struct nft_object *nft_obj_lookup(const struct net *net,
7255 const struct nft_table *table,
7256 const struct nlattr *nla, u32 objtype,
7259 struct nft_object_hash_key k = { .table = table };
7260 char search[NFT_OBJ_MAXNAMELEN];
7261 struct rhlist_head *tmp, *list;
7262 struct nft_object *obj;
7264 nla_strscpy(search, nla, sizeof(search));
7267 WARN_ON_ONCE(!rcu_read_lock_held() &&
7268 !lockdep_commit_lock_is_held(net));
7271 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7275 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7276 if (objtype == obj->ops->type->type &&
7277 nft_active_genmask(obj, genmask)) {
7284 return ERR_PTR(-ENOENT);
7286 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7288 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7289 const struct nlattr *nla,
7290 u32 objtype, u8 genmask)
7292 struct nft_object *obj;
7294 list_for_each_entry(obj, &table->objects, list) {
7295 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7296 objtype == obj->ops->type->type &&
7297 nft_active_genmask(obj, genmask))
7300 return ERR_PTR(-ENOENT);
7303 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7304 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
7305 .len = NFT_TABLE_MAXNAMELEN - 1 },
7306 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
7307 .len = NFT_OBJ_MAXNAMELEN - 1 },
7308 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
7309 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
7310 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
7311 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
7312 .len = NFT_USERDATA_MAXLEN },
7315 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7316 const struct nft_object_type *type,
7317 const struct nlattr *attr)
7320 const struct nft_object_ops *ops;
7321 struct nft_object *obj;
7324 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7329 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7330 type->policy, NULL);
7334 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7337 if (type->select_ops) {
7338 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7348 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7352 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7365 return ERR_PTR(err);
7368 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7369 struct nft_object *obj, bool reset)
7371 struct nlattr *nest;
7373 nest = nla_nest_start_noflag(skb, attr);
7375 goto nla_put_failure;
7376 if (obj->ops->dump(skb, obj, reset) < 0)
7377 goto nla_put_failure;
7378 nla_nest_end(skb, nest);
7385 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
7387 const struct nft_object_type *type;
7389 list_for_each_entry(type, &nf_tables_objects, list) {
7390 if (objtype == type->type)
7396 static const struct nft_object_type *
7397 nft_obj_type_get(struct net *net, u32 objtype)
7399 const struct nft_object_type *type;
7401 type = __nft_obj_type_get(objtype);
7402 if (type != NULL && try_module_get(type->owner))
7405 lockdep_nfnl_nft_mutex_not_held();
7406 #ifdef CONFIG_MODULES
7408 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7409 return ERR_PTR(-EAGAIN);
7412 return ERR_PTR(-ENOENT);
7415 static int nf_tables_updobj(const struct nft_ctx *ctx,
7416 const struct nft_object_type *type,
7417 const struct nlattr *attr,
7418 struct nft_object *obj)
7420 struct nft_object *newobj;
7421 struct nft_trans *trans;
7424 if (!try_module_get(type->owner))
7427 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7428 sizeof(struct nft_trans_obj));
7432 newobj = nft_obj_init(ctx, type, attr);
7433 if (IS_ERR(newobj)) {
7434 err = PTR_ERR(newobj);
7435 goto err_free_trans;
7438 nft_trans_obj(trans) = obj;
7439 nft_trans_obj_update(trans) = true;
7440 nft_trans_obj_newobj(trans) = newobj;
7441 nft_trans_commit_list_add_tail(ctx->net, trans);
7448 module_put(type->owner);
7452 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7453 const struct nlattr * const nla[])
7455 struct netlink_ext_ack *extack = info->extack;
7456 u8 genmask = nft_genmask_next(info->net);
7457 u8 family = info->nfmsg->nfgen_family;
7458 const struct nft_object_type *type;
7459 struct net *net = info->net;
7460 struct nft_table *table;
7461 struct nft_object *obj;
7466 if (!nla[NFTA_OBJ_TYPE] ||
7467 !nla[NFTA_OBJ_NAME] ||
7468 !nla[NFTA_OBJ_DATA])
7471 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7472 NETLINK_CB(skb).portid);
7473 if (IS_ERR(table)) {
7474 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7475 return PTR_ERR(table);
7478 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7479 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7482 if (err != -ENOENT) {
7483 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7487 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7488 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7491 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7494 type = __nft_obj_type_get(objtype);
7495 if (WARN_ON_ONCE(!type))
7498 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7500 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7503 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7505 if (!nft_use_inc(&table->use))
7508 type = nft_obj_type_get(net, objtype);
7510 err = PTR_ERR(type);
7514 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7519 obj->key.table = table;
7520 obj->handle = nf_tables_alloc_handle(table);
7522 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7523 if (!obj->key.name) {
7528 if (nla[NFTA_OBJ_USERDATA]) {
7529 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7530 if (obj->udata == NULL)
7533 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7536 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7540 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7541 nft_objname_ht_params);
7545 list_add_tail_rcu(&obj->list, &table->objects);
7549 /* queued in transaction log */
7550 INIT_LIST_HEAD(&obj->list);
7555 kfree(obj->key.name);
7557 if (obj->ops->destroy)
7558 obj->ops->destroy(&ctx, obj);
7561 module_put(type->owner);
7563 nft_use_dec_restore(&table->use);
7568 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7569 u32 portid, u32 seq, int event, u32 flags,
7570 int family, const struct nft_table *table,
7571 struct nft_object *obj, bool reset)
7573 struct nlmsghdr *nlh;
7575 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7576 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7577 NFNETLINK_V0, nft_base_seq(net));
7579 goto nla_put_failure;
7581 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7582 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7583 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7585 goto nla_put_failure;
7587 if (event == NFT_MSG_DELOBJ) {
7588 nlmsg_end(skb, nlh);
7592 if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7593 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7594 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7595 goto nla_put_failure;
7598 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7599 goto nla_put_failure;
7601 nlmsg_end(skb, nlh);
7605 nlmsg_trim(skb, nlh);
7609 struct nft_obj_filter {
7614 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7616 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7617 const struct nft_table *table;
7618 unsigned int idx = 0, s_idx = cb->args[0];
7619 struct nft_obj_filter *filter = cb->data;
7620 struct net *net = sock_net(skb->sk);
7621 int family = nfmsg->nfgen_family;
7622 struct nftables_pernet *nft_net;
7623 struct nft_object *obj;
7626 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7630 nft_net = nft_pernet(net);
7631 cb->seq = READ_ONCE(nft_net->base_seq);
7633 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7634 if (family != NFPROTO_UNSPEC && family != table->family)
7637 list_for_each_entry_rcu(obj, &table->objects, list) {
7638 if (!nft_is_active(net, obj))
7643 memset(&cb->args[1], 0,
7644 sizeof(cb->args) - sizeof(cb->args[0]));
7645 if (filter && filter->table &&
7646 strcmp(filter->table, table->name))
7649 filter->type != NFT_OBJECT_UNSPEC &&
7650 obj->ops->type->type != filter->type)
7653 char *buf = kasprintf(GFP_ATOMIC,
7658 audit_log_nfcfg(buf,
7661 AUDIT_NFT_OP_OBJ_RESET,
7666 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7669 NLM_F_MULTI | NLM_F_APPEND,
7670 table->family, table,
7674 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7686 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7688 const struct nlattr * const *nla = cb->data;
7689 struct nft_obj_filter *filter = NULL;
7691 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7692 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7696 if (nla[NFTA_OBJ_TABLE]) {
7697 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7698 if (!filter->table) {
7704 if (nla[NFTA_OBJ_TYPE])
7705 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7712 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7714 struct nft_obj_filter *filter = cb->data;
7717 kfree(filter->table);
7724 /* called with rcu_read_lock held */
7725 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7726 const struct nlattr * const nla[])
7728 struct netlink_ext_ack *extack = info->extack;
7729 u8 genmask = nft_genmask_cur(info->net);
7730 u8 family = info->nfmsg->nfgen_family;
7731 const struct nft_table *table;
7732 struct net *net = info->net;
7733 struct nft_object *obj;
7734 struct sk_buff *skb2;
7739 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7740 struct netlink_dump_control c = {
7741 .start = nf_tables_dump_obj_start,
7742 .dump = nf_tables_dump_obj,
7743 .done = nf_tables_dump_obj_done,
7744 .module = THIS_MODULE,
7745 .data = (void *)nla,
7748 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7751 if (!nla[NFTA_OBJ_NAME] ||
7752 !nla[NFTA_OBJ_TYPE])
7755 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7756 if (IS_ERR(table)) {
7757 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7758 return PTR_ERR(table);
7761 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7762 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7764 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7765 return PTR_ERR(obj);
7768 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7772 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7776 const struct nftables_pernet *nft_net;
7779 nft_net = nft_pernet(net);
7780 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7782 audit_log_nfcfg(buf,
7785 AUDIT_NFT_OP_OBJ_RESET,
7790 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7791 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7792 family, table, obj, reset);
7794 goto err_fill_obj_info;
7796 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7803 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7805 if (obj->ops->destroy)
7806 obj->ops->destroy(ctx, obj);
7808 module_put(obj->ops->type->owner);
7809 kfree(obj->key.name);
7814 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7815 const struct nlattr * const nla[])
7817 struct netlink_ext_ack *extack = info->extack;
7818 u8 genmask = nft_genmask_next(info->net);
7819 u8 family = info->nfmsg->nfgen_family;
7820 struct net *net = info->net;
7821 const struct nlattr *attr;
7822 struct nft_table *table;
7823 struct nft_object *obj;
7827 if (!nla[NFTA_OBJ_TYPE] ||
7828 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7831 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7832 NETLINK_CB(skb).portid);
7833 if (IS_ERR(table)) {
7834 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7835 return PTR_ERR(table);
7838 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7839 if (nla[NFTA_OBJ_HANDLE]) {
7840 attr = nla[NFTA_OBJ_HANDLE];
7841 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7843 attr = nla[NFTA_OBJ_NAME];
7844 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7848 if (PTR_ERR(obj) == -ENOENT &&
7849 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7852 NL_SET_BAD_ATTR(extack, attr);
7853 return PTR_ERR(obj);
7856 NL_SET_BAD_ATTR(extack, attr);
7860 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7862 return nft_delobj(&ctx, obj);
7865 void nft_obj_notify(struct net *net, const struct nft_table *table,
7866 struct nft_object *obj, u32 portid, u32 seq, int event,
7867 u16 flags, int family, int report, gfp_t gfp)
7869 struct nftables_pernet *nft_net = nft_pernet(net);
7870 struct sk_buff *skb;
7872 char *buf = kasprintf(gfp, "%s:%u",
7873 table->name, nft_net->base_seq);
7875 audit_log_nfcfg(buf,
7878 event == NFT_MSG_NEWOBJ ?
7879 AUDIT_NFT_OP_OBJ_REGISTER :
7880 AUDIT_NFT_OP_OBJ_UNREGISTER,
7885 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7888 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7892 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7893 flags & (NLM_F_CREATE | NLM_F_EXCL),
7894 family, table, obj, false);
7900 nft_notify_enqueue(skb, report, &nft_net->notify_list);
7903 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7905 EXPORT_SYMBOL_GPL(nft_obj_notify);
7907 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7908 struct nft_object *obj, int event)
7910 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7911 ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7917 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7919 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7920 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7921 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7923 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7925 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7927 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7928 list_del_rcu(&type->list);
7929 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7931 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7933 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7934 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
7935 .len = NFT_NAME_MAXLEN - 1 },
7936 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
7937 .len = NFT_NAME_MAXLEN - 1 },
7938 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
7939 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
7940 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
7943 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7944 const struct nlattr *nla, u8 genmask)
7946 struct nft_flowtable *flowtable;
7948 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7949 if (!nla_strcmp(nla, flowtable->name) &&
7950 nft_active_genmask(flowtable, genmask))
7953 return ERR_PTR(-ENOENT);
7955 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7957 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7958 struct nft_flowtable *flowtable,
7959 enum nft_trans_phase phase)
7962 case NFT_TRANS_PREPARE_ERROR:
7963 case NFT_TRANS_PREPARE:
7964 case NFT_TRANS_ABORT:
7965 case NFT_TRANS_RELEASE:
7966 nft_use_dec(&flowtable->use);
7972 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7974 static struct nft_flowtable *
7975 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7976 const struct nlattr *nla, u8 genmask)
7978 struct nft_flowtable *flowtable;
7980 list_for_each_entry(flowtable, &table->flowtables, list) {
7981 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7982 nft_active_genmask(flowtable, genmask))
7985 return ERR_PTR(-ENOENT);
7988 struct nft_flowtable_hook {
7991 struct list_head list;
7994 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7995 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
7996 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
7997 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
8000 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
8001 const struct nlattr * const nla[],
8002 struct nft_flowtable_hook *flowtable_hook,
8003 struct nft_flowtable *flowtable,
8004 struct netlink_ext_ack *extack, bool add)
8006 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
8007 struct nft_hook *hook;
8008 int hooknum, priority;
8011 INIT_LIST_HEAD(&flowtable_hook->list);
8013 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
8014 nla[NFTA_FLOWTABLE_HOOK],
8015 nft_flowtable_hook_policy, NULL);
8020 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
8021 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8022 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8026 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8027 if (hooknum != NF_NETDEV_INGRESS)
8030 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8032 flowtable_hook->priority = priority;
8033 flowtable_hook->num = hooknum;
8035 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8036 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8037 if (hooknum != flowtable->hooknum)
8041 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8042 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8043 if (priority != flowtable->data.priority)
8047 flowtable_hook->priority = flowtable->data.priority;
8048 flowtable_hook->num = flowtable->hooknum;
8051 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8052 err = nf_tables_parse_netdev_hooks(ctx->net,
8053 tb[NFTA_FLOWTABLE_HOOK_DEVS],
8054 &flowtable_hook->list,
8060 list_for_each_entry(hook, &flowtable_hook->list, list) {
8061 hook->ops.pf = NFPROTO_NETDEV;
8062 hook->ops.hooknum = flowtable_hook->num;
8063 hook->ops.priority = flowtable_hook->priority;
8064 hook->ops.priv = &flowtable->data;
8065 hook->ops.hook = flowtable->data.type->hook;
8071 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8073 const struct nf_flowtable_type *type;
8075 list_for_each_entry(type, &nf_tables_flowtables, list) {
8076 if (family == type->family)
8082 static const struct nf_flowtable_type *
8083 nft_flowtable_type_get(struct net *net, u8 family)
8085 const struct nf_flowtable_type *type;
8087 type = __nft_flowtable_type_get(family);
8088 if (type != NULL && try_module_get(type->owner))
8091 lockdep_nfnl_nft_mutex_not_held();
8092 #ifdef CONFIG_MODULES
8094 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8095 return ERR_PTR(-EAGAIN);
8098 return ERR_PTR(-ENOENT);
8101 /* Only called from error and netdev event paths. */
8102 static void nft_unregister_flowtable_hook(struct net *net,
8103 struct nft_flowtable *flowtable,
8104 struct nft_hook *hook)
8106 nf_unregister_net_hook(net, &hook->ops);
8107 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8111 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8112 struct list_head *hook_list,
8113 bool release_netdev)
8115 struct nft_hook *hook, *next;
8117 list_for_each_entry_safe(hook, next, hook_list, list) {
8118 nf_unregister_net_hook(net, &hook->ops);
8119 if (release_netdev) {
8120 list_del(&hook->list);
8121 kfree_rcu(hook, rcu);
8126 static void nft_unregister_flowtable_net_hooks(struct net *net,
8127 struct list_head *hook_list)
8129 __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8132 static int nft_register_flowtable_net_hooks(struct net *net,
8133 struct nft_table *table,
8134 struct list_head *hook_list,
8135 struct nft_flowtable *flowtable)
8137 struct nft_hook *hook, *hook2, *next;
8138 struct nft_flowtable *ft;
8141 list_for_each_entry(hook, hook_list, list) {
8142 list_for_each_entry(ft, &table->flowtables, list) {
8143 if (!nft_is_active_next(net, ft))
8146 list_for_each_entry(hook2, &ft->hook_list, list) {
8147 if (hook->ops.dev == hook2->ops.dev &&
8148 hook->ops.pf == hook2->ops.pf) {
8150 goto err_unregister_net_hooks;
8155 err = flowtable->data.type->setup(&flowtable->data,
8159 goto err_unregister_net_hooks;
8161 err = nf_register_net_hook(net, &hook->ops);
8163 flowtable->data.type->setup(&flowtable->data,
8166 goto err_unregister_net_hooks;
8174 err_unregister_net_hooks:
8175 list_for_each_entry_safe(hook, next, hook_list, list) {
8179 nft_unregister_flowtable_hook(net, flowtable, hook);
8180 list_del_rcu(&hook->list);
8181 kfree_rcu(hook, rcu);
8187 static void nft_hooks_destroy(struct list_head *hook_list)
8189 struct nft_hook *hook, *next;
8191 list_for_each_entry_safe(hook, next, hook_list, list) {
8192 list_del_rcu(&hook->list);
8193 kfree_rcu(hook, rcu);
8197 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8198 struct nft_flowtable *flowtable,
8199 struct netlink_ext_ack *extack)
8201 const struct nlattr * const *nla = ctx->nla;
8202 struct nft_flowtable_hook flowtable_hook;
8203 struct nft_hook *hook, *next;
8204 struct nft_trans *trans;
8205 bool unregister = false;
8209 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8214 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8215 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8216 list_del(&hook->list);
8221 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8222 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8223 if (flags & ~NFT_FLOWTABLE_MASK) {
8225 goto err_flowtable_update_hook;
8227 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8228 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8230 goto err_flowtable_update_hook;
8233 flags = flowtable->data.flags;
8236 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8237 &flowtable_hook.list, flowtable);
8239 goto err_flowtable_update_hook;
8241 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8242 sizeof(struct nft_trans_flowtable));
8246 goto err_flowtable_update_hook;
8249 nft_trans_flowtable_flags(trans) = flags;
8250 nft_trans_flowtable(trans) = flowtable;
8251 nft_trans_flowtable_update(trans) = true;
8252 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8253 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8255 nft_trans_commit_list_add_tail(ctx->net, trans);
8259 err_flowtable_update_hook:
8260 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8262 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8263 list_del_rcu(&hook->list);
8264 kfree_rcu(hook, rcu);
8271 static int nf_tables_newflowtable(struct sk_buff *skb,
8272 const struct nfnl_info *info,
8273 const struct nlattr * const nla[])
8275 struct netlink_ext_ack *extack = info->extack;
8276 struct nft_flowtable_hook flowtable_hook;
8277 u8 genmask = nft_genmask_next(info->net);
8278 u8 family = info->nfmsg->nfgen_family;
8279 const struct nf_flowtable_type *type;
8280 struct nft_flowtable *flowtable;
8281 struct nft_hook *hook, *next;
8282 struct net *net = info->net;
8283 struct nft_table *table;
8287 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8288 !nla[NFTA_FLOWTABLE_NAME] ||
8289 !nla[NFTA_FLOWTABLE_HOOK])
8292 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8293 genmask, NETLINK_CB(skb).portid);
8294 if (IS_ERR(table)) {
8295 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8296 return PTR_ERR(table);
8299 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8301 if (IS_ERR(flowtable)) {
8302 err = PTR_ERR(flowtable);
8303 if (err != -ENOENT) {
8304 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8308 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8309 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8313 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8315 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8318 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8320 if (!nft_use_inc(&table->use))
8323 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8326 goto flowtable_alloc;
8329 flowtable->table = table;
8330 flowtable->handle = nf_tables_alloc_handle(table);
8331 INIT_LIST_HEAD(&flowtable->hook_list);
8333 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8334 if (!flowtable->name) {
8339 type = nft_flowtable_type_get(net, family);
8341 err = PTR_ERR(type);
8345 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8346 flowtable->data.flags =
8347 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8348 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8354 write_pnet(&flowtable->data.net, net);
8355 flowtable->data.type = type;
8356 err = type->init(&flowtable->data);
8360 err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8365 list_splice(&flowtable_hook.list, &flowtable->hook_list);
8366 flowtable->data.priority = flowtable_hook.priority;
8367 flowtable->hooknum = flowtable_hook.num;
8369 err = nft_register_flowtable_net_hooks(ctx.net, table,
8370 &flowtable->hook_list,
8373 nft_hooks_destroy(&flowtable->hook_list);
8377 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8381 list_add_tail_rcu(&flowtable->list, &table->flowtables);
8385 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8386 nft_unregister_flowtable_hook(net, flowtable, hook);
8387 list_del_rcu(&hook->list);
8388 kfree_rcu(hook, rcu);
8391 flowtable->data.type->free(&flowtable->data);
8393 module_put(type->owner);
8395 kfree(flowtable->name);
8399 nft_use_dec_restore(&table->use);
8404 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8406 struct nft_hook *this, *next;
8408 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8409 list_del(&this->list);
8414 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8415 struct nft_flowtable *flowtable,
8416 struct netlink_ext_ack *extack)
8418 const struct nlattr * const *nla = ctx->nla;
8419 struct nft_flowtable_hook flowtable_hook;
8420 LIST_HEAD(flowtable_del_list);
8421 struct nft_hook *this, *hook;
8422 struct nft_trans *trans;
8425 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8430 list_for_each_entry(this, &flowtable_hook.list, list) {
8431 hook = nft_hook_list_find(&flowtable->hook_list, this);
8434 goto err_flowtable_del_hook;
8436 list_move(&hook->list, &flowtable_del_list);
8439 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8440 sizeof(struct nft_trans_flowtable));
8443 goto err_flowtable_del_hook;
8446 nft_trans_flowtable(trans) = flowtable;
8447 nft_trans_flowtable_update(trans) = true;
8448 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8449 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8450 nft_flowtable_hook_release(&flowtable_hook);
8452 nft_trans_commit_list_add_tail(ctx->net, trans);
8456 err_flowtable_del_hook:
8457 list_splice(&flowtable_del_list, &flowtable->hook_list);
8458 nft_flowtable_hook_release(&flowtable_hook);
8463 static int nf_tables_delflowtable(struct sk_buff *skb,
8464 const struct nfnl_info *info,
8465 const struct nlattr * const nla[])
8467 struct netlink_ext_ack *extack = info->extack;
8468 u8 genmask = nft_genmask_next(info->net);
8469 u8 family = info->nfmsg->nfgen_family;
8470 struct nft_flowtable *flowtable;
8471 struct net *net = info->net;
8472 const struct nlattr *attr;
8473 struct nft_table *table;
8476 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8477 (!nla[NFTA_FLOWTABLE_NAME] &&
8478 !nla[NFTA_FLOWTABLE_HANDLE]))
8481 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8482 genmask, NETLINK_CB(skb).portid);
8483 if (IS_ERR(table)) {
8484 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8485 return PTR_ERR(table);
8488 if (nla[NFTA_FLOWTABLE_HANDLE]) {
8489 attr = nla[NFTA_FLOWTABLE_HANDLE];
8490 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8492 attr = nla[NFTA_FLOWTABLE_NAME];
8493 flowtable = nft_flowtable_lookup(table, attr, genmask);
8496 if (IS_ERR(flowtable)) {
8497 if (PTR_ERR(flowtable) == -ENOENT &&
8498 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8501 NL_SET_BAD_ATTR(extack, attr);
8502 return PTR_ERR(flowtable);
8505 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8507 if (nla[NFTA_FLOWTABLE_HOOK])
8508 return nft_delflowtable_hook(&ctx, flowtable, extack);
8510 if (flowtable->use > 0) {
8511 NL_SET_BAD_ATTR(extack, attr);
8515 return nft_delflowtable(&ctx, flowtable);
8518 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8519 u32 portid, u32 seq, int event,
8520 u32 flags, int family,
8521 struct nft_flowtable *flowtable,
8522 struct list_head *hook_list)
8524 struct nlattr *nest, *nest_devs;
8525 struct nft_hook *hook;
8526 struct nlmsghdr *nlh;
8528 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8529 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8530 NFNETLINK_V0, nft_base_seq(net));
8532 goto nla_put_failure;
8534 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8535 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8536 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8537 NFTA_FLOWTABLE_PAD))
8538 goto nla_put_failure;
8540 if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8541 nlmsg_end(skb, nlh);
8545 if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8546 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8547 goto nla_put_failure;
8549 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8551 goto nla_put_failure;
8552 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8553 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8554 goto nla_put_failure;
8556 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8558 goto nla_put_failure;
8561 hook_list = &flowtable->hook_list;
8563 list_for_each_entry_rcu(hook, hook_list, list) {
8564 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8565 goto nla_put_failure;
8567 nla_nest_end(skb, nest_devs);
8568 nla_nest_end(skb, nest);
8570 nlmsg_end(skb, nlh);
8574 nlmsg_trim(skb, nlh);
8578 struct nft_flowtable_filter {
8582 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8583 struct netlink_callback *cb)
8585 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8586 struct nft_flowtable_filter *filter = cb->data;
8587 unsigned int idx = 0, s_idx = cb->args[0];
8588 struct net *net = sock_net(skb->sk);
8589 int family = nfmsg->nfgen_family;
8590 struct nft_flowtable *flowtable;
8591 struct nftables_pernet *nft_net;
8592 const struct nft_table *table;
8595 nft_net = nft_pernet(net);
8596 cb->seq = READ_ONCE(nft_net->base_seq);
8598 list_for_each_entry_rcu(table, &nft_net->tables, list) {
8599 if (family != NFPROTO_UNSPEC && family != table->family)
8602 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8603 if (!nft_is_active(net, flowtable))
8608 memset(&cb->args[1], 0,
8609 sizeof(cb->args) - sizeof(cb->args[0]));
8610 if (filter && filter->table &&
8611 strcmp(filter->table, table->name))
8614 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8616 NFT_MSG_NEWFLOWTABLE,
8617 NLM_F_MULTI | NLM_F_APPEND,
8619 flowtable, NULL) < 0)
8622 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8634 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8636 const struct nlattr * const *nla = cb->data;
8637 struct nft_flowtable_filter *filter = NULL;
8639 if (nla[NFTA_FLOWTABLE_TABLE]) {
8640 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8644 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8646 if (!filter->table) {
8656 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8658 struct nft_flowtable_filter *filter = cb->data;
8663 kfree(filter->table);
8669 /* called with rcu_read_lock held */
8670 static int nf_tables_getflowtable(struct sk_buff *skb,
8671 const struct nfnl_info *info,
8672 const struct nlattr * const nla[])
8674 u8 genmask = nft_genmask_cur(info->net);
8675 u8 family = info->nfmsg->nfgen_family;
8676 struct nft_flowtable *flowtable;
8677 const struct nft_table *table;
8678 struct net *net = info->net;
8679 struct sk_buff *skb2;
8682 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8683 struct netlink_dump_control c = {
8684 .start = nf_tables_dump_flowtable_start,
8685 .dump = nf_tables_dump_flowtable,
8686 .done = nf_tables_dump_flowtable_done,
8687 .module = THIS_MODULE,
8688 .data = (void *)nla,
8691 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8694 if (!nla[NFTA_FLOWTABLE_NAME])
8697 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8700 return PTR_ERR(table);
8702 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8704 if (IS_ERR(flowtable))
8705 return PTR_ERR(flowtable);
8707 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8711 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8712 info->nlh->nlmsg_seq,
8713 NFT_MSG_NEWFLOWTABLE, 0, family,
8716 goto err_fill_flowtable_info;
8718 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8720 err_fill_flowtable_info:
8725 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8726 struct nft_flowtable *flowtable,
8727 struct list_head *hook_list, int event)
8729 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8730 struct sk_buff *skb;
8735 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8738 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8742 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8743 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8745 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8746 ctx->seq, event, flags,
8747 ctx->family, flowtable, hook_list);
8753 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8756 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8759 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8761 struct nft_hook *hook, *next;
8763 flowtable->data.type->free(&flowtable->data);
8764 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8765 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8767 list_del_rcu(&hook->list);
8770 kfree(flowtable->name);
8771 module_put(flowtable->data.type->owner);
8775 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8776 u32 portid, u32 seq)
8778 struct nftables_pernet *nft_net = nft_pernet(net);
8779 struct nlmsghdr *nlh;
8780 char buf[TASK_COMM_LEN];
8781 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8783 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8784 NFNETLINK_V0, nft_base_seq(net));
8786 goto nla_put_failure;
8788 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8789 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8790 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8791 goto nla_put_failure;
8793 nlmsg_end(skb, nlh);
8797 nlmsg_trim(skb, nlh);
8801 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8802 struct nft_flowtable *flowtable)
8804 struct nft_hook *hook;
8806 list_for_each_entry(hook, &flowtable->hook_list, list) {
8807 if (hook->ops.dev != dev)
8810 /* flow_offload_netdev_event() cleans up entries for us. */
8811 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8812 list_del_rcu(&hook->list);
8813 kfree_rcu(hook, rcu);
8818 static int nf_tables_flowtable_event(struct notifier_block *this,
8819 unsigned long event, void *ptr)
8821 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8822 struct nft_flowtable *flowtable;
8823 struct nftables_pernet *nft_net;
8824 struct nft_table *table;
8827 if (event != NETDEV_UNREGISTER)
8831 nft_net = nft_pernet(net);
8832 mutex_lock(&nft_net->commit_mutex);
8833 list_for_each_entry(table, &nft_net->tables, list) {
8834 list_for_each_entry(flowtable, &table->flowtables, list) {
8835 nft_flowtable_event(event, dev, flowtable);
8838 mutex_unlock(&nft_net->commit_mutex);
8843 static struct notifier_block nf_tables_flowtable_notifier = {
8844 .notifier_call = nf_tables_flowtable_event,
8847 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8850 struct nlmsghdr *nlh = nlmsg_hdr(skb);
8851 struct sk_buff *skb2;
8854 if (!nlmsg_report(nlh) &&
8855 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8858 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8862 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8869 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8870 nlmsg_report(nlh), GFP_KERNEL);
8873 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8877 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8878 const struct nlattr * const nla[])
8880 struct sk_buff *skb2;
8883 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8887 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8888 info->nlh->nlmsg_seq);
8890 goto err_fill_gen_info;
8892 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8899 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8900 [NFT_MSG_NEWTABLE] = {
8901 .call = nf_tables_newtable,
8902 .type = NFNL_CB_BATCH,
8903 .attr_count = NFTA_TABLE_MAX,
8904 .policy = nft_table_policy,
8906 [NFT_MSG_GETTABLE] = {
8907 .call = nf_tables_gettable,
8908 .type = NFNL_CB_RCU,
8909 .attr_count = NFTA_TABLE_MAX,
8910 .policy = nft_table_policy,
8912 [NFT_MSG_DELTABLE] = {
8913 .call = nf_tables_deltable,
8914 .type = NFNL_CB_BATCH,
8915 .attr_count = NFTA_TABLE_MAX,
8916 .policy = nft_table_policy,
8918 [NFT_MSG_DESTROYTABLE] = {
8919 .call = nf_tables_deltable,
8920 .type = NFNL_CB_BATCH,
8921 .attr_count = NFTA_TABLE_MAX,
8922 .policy = nft_table_policy,
8924 [NFT_MSG_NEWCHAIN] = {
8925 .call = nf_tables_newchain,
8926 .type = NFNL_CB_BATCH,
8927 .attr_count = NFTA_CHAIN_MAX,
8928 .policy = nft_chain_policy,
8930 [NFT_MSG_GETCHAIN] = {
8931 .call = nf_tables_getchain,
8932 .type = NFNL_CB_RCU,
8933 .attr_count = NFTA_CHAIN_MAX,
8934 .policy = nft_chain_policy,
8936 [NFT_MSG_DELCHAIN] = {
8937 .call = nf_tables_delchain,
8938 .type = NFNL_CB_BATCH,
8939 .attr_count = NFTA_CHAIN_MAX,
8940 .policy = nft_chain_policy,
8942 [NFT_MSG_DESTROYCHAIN] = {
8943 .call = nf_tables_delchain,
8944 .type = NFNL_CB_BATCH,
8945 .attr_count = NFTA_CHAIN_MAX,
8946 .policy = nft_chain_policy,
8948 [NFT_MSG_NEWRULE] = {
8949 .call = nf_tables_newrule,
8950 .type = NFNL_CB_BATCH,
8951 .attr_count = NFTA_RULE_MAX,
8952 .policy = nft_rule_policy,
8954 [NFT_MSG_GETRULE] = {
8955 .call = nf_tables_getrule,
8956 .type = NFNL_CB_RCU,
8957 .attr_count = NFTA_RULE_MAX,
8958 .policy = nft_rule_policy,
8960 [NFT_MSG_GETRULE_RESET] = {
8961 .call = nf_tables_getrule,
8962 .type = NFNL_CB_RCU,
8963 .attr_count = NFTA_RULE_MAX,
8964 .policy = nft_rule_policy,
8966 [NFT_MSG_DELRULE] = {
8967 .call = nf_tables_delrule,
8968 .type = NFNL_CB_BATCH,
8969 .attr_count = NFTA_RULE_MAX,
8970 .policy = nft_rule_policy,
8972 [NFT_MSG_DESTROYRULE] = {
8973 .call = nf_tables_delrule,
8974 .type = NFNL_CB_BATCH,
8975 .attr_count = NFTA_RULE_MAX,
8976 .policy = nft_rule_policy,
8978 [NFT_MSG_NEWSET] = {
8979 .call = nf_tables_newset,
8980 .type = NFNL_CB_BATCH,
8981 .attr_count = NFTA_SET_MAX,
8982 .policy = nft_set_policy,
8984 [NFT_MSG_GETSET] = {
8985 .call = nf_tables_getset,
8986 .type = NFNL_CB_RCU,
8987 .attr_count = NFTA_SET_MAX,
8988 .policy = nft_set_policy,
8990 [NFT_MSG_DELSET] = {
8991 .call = nf_tables_delset,
8992 .type = NFNL_CB_BATCH,
8993 .attr_count = NFTA_SET_MAX,
8994 .policy = nft_set_policy,
8996 [NFT_MSG_DESTROYSET] = {
8997 .call = nf_tables_delset,
8998 .type = NFNL_CB_BATCH,
8999 .attr_count = NFTA_SET_MAX,
9000 .policy = nft_set_policy,
9002 [NFT_MSG_NEWSETELEM] = {
9003 .call = nf_tables_newsetelem,
9004 .type = NFNL_CB_BATCH,
9005 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9006 .policy = nft_set_elem_list_policy,
9008 [NFT_MSG_GETSETELEM] = {
9009 .call = nf_tables_getsetelem,
9010 .type = NFNL_CB_RCU,
9011 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9012 .policy = nft_set_elem_list_policy,
9014 [NFT_MSG_GETSETELEM_RESET] = {
9015 .call = nf_tables_getsetelem,
9016 .type = NFNL_CB_RCU,
9017 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9018 .policy = nft_set_elem_list_policy,
9020 [NFT_MSG_DELSETELEM] = {
9021 .call = nf_tables_delsetelem,
9022 .type = NFNL_CB_BATCH,
9023 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9024 .policy = nft_set_elem_list_policy,
9026 [NFT_MSG_DESTROYSETELEM] = {
9027 .call = nf_tables_delsetelem,
9028 .type = NFNL_CB_BATCH,
9029 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9030 .policy = nft_set_elem_list_policy,
9032 [NFT_MSG_GETGEN] = {
9033 .call = nf_tables_getgen,
9034 .type = NFNL_CB_RCU,
9036 [NFT_MSG_NEWOBJ] = {
9037 .call = nf_tables_newobj,
9038 .type = NFNL_CB_BATCH,
9039 .attr_count = NFTA_OBJ_MAX,
9040 .policy = nft_obj_policy,
9042 [NFT_MSG_GETOBJ] = {
9043 .call = nf_tables_getobj,
9044 .type = NFNL_CB_RCU,
9045 .attr_count = NFTA_OBJ_MAX,
9046 .policy = nft_obj_policy,
9048 [NFT_MSG_DELOBJ] = {
9049 .call = nf_tables_delobj,
9050 .type = NFNL_CB_BATCH,
9051 .attr_count = NFTA_OBJ_MAX,
9052 .policy = nft_obj_policy,
9054 [NFT_MSG_DESTROYOBJ] = {
9055 .call = nf_tables_delobj,
9056 .type = NFNL_CB_BATCH,
9057 .attr_count = NFTA_OBJ_MAX,
9058 .policy = nft_obj_policy,
9060 [NFT_MSG_GETOBJ_RESET] = {
9061 .call = nf_tables_getobj,
9062 .type = NFNL_CB_RCU,
9063 .attr_count = NFTA_OBJ_MAX,
9064 .policy = nft_obj_policy,
9066 [NFT_MSG_NEWFLOWTABLE] = {
9067 .call = nf_tables_newflowtable,
9068 .type = NFNL_CB_BATCH,
9069 .attr_count = NFTA_FLOWTABLE_MAX,
9070 .policy = nft_flowtable_policy,
9072 [NFT_MSG_GETFLOWTABLE] = {
9073 .call = nf_tables_getflowtable,
9074 .type = NFNL_CB_RCU,
9075 .attr_count = NFTA_FLOWTABLE_MAX,
9076 .policy = nft_flowtable_policy,
9078 [NFT_MSG_DELFLOWTABLE] = {
9079 .call = nf_tables_delflowtable,
9080 .type = NFNL_CB_BATCH,
9081 .attr_count = NFTA_FLOWTABLE_MAX,
9082 .policy = nft_flowtable_policy,
9084 [NFT_MSG_DESTROYFLOWTABLE] = {
9085 .call = nf_tables_delflowtable,
9086 .type = NFNL_CB_BATCH,
9087 .attr_count = NFTA_FLOWTABLE_MAX,
9088 .policy = nft_flowtable_policy,
9092 static int nf_tables_validate(struct net *net)
9094 struct nftables_pernet *nft_net = nft_pernet(net);
9095 struct nft_table *table;
9097 list_for_each_entry(table, &nft_net->tables, list) {
9098 switch (table->validate_state) {
9099 case NFT_VALIDATE_SKIP:
9101 case NFT_VALIDATE_NEED:
9102 nft_validate_state_update(table, NFT_VALIDATE_DO);
9104 case NFT_VALIDATE_DO:
9105 if (nft_table_validate(net, table) < 0)
9108 nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9116 /* a drop policy has to be deferred until all rules have been activated,
9117 * otherwise a large ruleset that contains a drop-policy base chain will
9118 * cause all packets to get dropped until the full transaction has been
9121 * We defer the drop policy until the transaction has been finalized.
9123 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9125 struct nft_base_chain *basechain;
9127 if (nft_trans_chain_policy(trans) != NF_DROP)
9130 if (!nft_is_base_chain(trans->ctx.chain))
9133 basechain = nft_base_chain(trans->ctx.chain);
9134 basechain->policy = NF_DROP;
9137 static void nft_chain_commit_update(struct nft_trans *trans)
9139 struct nft_base_chain *basechain;
9141 if (nft_trans_chain_name(trans)) {
9142 rhltable_remove(&trans->ctx.table->chains_ht,
9143 &trans->ctx.chain->rhlhead,
9144 nft_chain_ht_params);
9145 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9146 rhltable_insert_key(&trans->ctx.table->chains_ht,
9147 trans->ctx.chain->name,
9148 &trans->ctx.chain->rhlhead,
9149 nft_chain_ht_params);
9152 if (!nft_is_base_chain(trans->ctx.chain))
9155 nft_chain_stats_replace(trans);
9157 basechain = nft_base_chain(trans->ctx.chain);
9159 switch (nft_trans_chain_policy(trans)) {
9162 basechain->policy = nft_trans_chain_policy(trans);
9167 static void nft_obj_commit_update(struct nft_trans *trans)
9169 struct nft_object *newobj;
9170 struct nft_object *obj;
9172 obj = nft_trans_obj(trans);
9173 newobj = nft_trans_obj_newobj(trans);
9175 if (obj->ops->update)
9176 obj->ops->update(obj, newobj);
9178 nft_obj_destroy(&trans->ctx, newobj);
9181 static void nft_commit_release(struct nft_trans *trans)
9183 switch (trans->msg_type) {
9184 case NFT_MSG_DELTABLE:
9185 case NFT_MSG_DESTROYTABLE:
9186 nf_tables_table_destroy(&trans->ctx);
9188 case NFT_MSG_NEWCHAIN:
9189 free_percpu(nft_trans_chain_stats(trans));
9190 kfree(nft_trans_chain_name(trans));
9192 case NFT_MSG_DELCHAIN:
9193 case NFT_MSG_DESTROYCHAIN:
9194 if (nft_trans_chain_update(trans))
9195 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9197 nf_tables_chain_destroy(&trans->ctx);
9199 case NFT_MSG_DELRULE:
9200 case NFT_MSG_DESTROYRULE:
9201 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9203 case NFT_MSG_DELSET:
9204 case NFT_MSG_DESTROYSET:
9205 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9207 case NFT_MSG_DELSETELEM:
9208 case NFT_MSG_DESTROYSETELEM:
9209 nf_tables_set_elem_destroy(&trans->ctx,
9210 nft_trans_elem_set(trans),
9211 nft_trans_elem(trans).priv);
9213 case NFT_MSG_DELOBJ:
9214 case NFT_MSG_DESTROYOBJ:
9215 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9217 case NFT_MSG_DELFLOWTABLE:
9218 case NFT_MSG_DESTROYFLOWTABLE:
9219 if (nft_trans_flowtable_update(trans))
9220 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9222 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9227 put_net(trans->ctx.net);
9232 static void nf_tables_trans_destroy_work(struct work_struct *w)
9234 struct nft_trans *trans, *next;
9237 spin_lock(&nf_tables_destroy_list_lock);
9238 list_splice_init(&nf_tables_destroy_list, &head);
9239 spin_unlock(&nf_tables_destroy_list_lock);
9241 if (list_empty(&head))
9246 list_for_each_entry_safe(trans, next, &head, list) {
9247 nft_trans_list_del(trans);
9248 nft_commit_release(trans);
9252 void nf_tables_trans_destroy_flush_work(void)
9254 flush_work(&trans_destroy_work);
9256 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9258 static bool nft_expr_reduce(struct nft_regs_track *track,
9259 const struct nft_expr *expr)
9264 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9266 const struct nft_expr *expr, *last;
9267 struct nft_regs_track track = {};
9268 unsigned int size, data_size;
9269 void *data, *data_boundary;
9270 struct nft_rule_dp *prule;
9271 struct nft_rule *rule;
9273 /* already handled or inactive chain? */
9274 if (chain->blob_next || !nft_is_active_next(net, chain))
9278 list_for_each_entry(rule, &chain->rules, list) {
9279 if (nft_is_active_next(net, rule)) {
9280 data_size += sizeof(*prule) + rule->dlen;
9281 if (data_size > INT_MAX)
9286 chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9287 if (!chain->blob_next)
9290 data = (void *)chain->blob_next->data;
9291 data_boundary = data + data_size;
9294 list_for_each_entry(rule, &chain->rules, list) {
9295 if (!nft_is_active_next(net, rule))
9298 prule = (struct nft_rule_dp *)data;
9299 data += offsetof(struct nft_rule_dp, data);
9300 if (WARN_ON_ONCE(data > data_boundary))
9304 track.last = nft_expr_last(rule);
9305 nft_rule_for_each_expr(expr, last, rule) {
9308 if (nft_expr_reduce(&track, expr)) {
9313 if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9316 memcpy(data + size, expr, expr->ops->size);
9317 size += expr->ops->size;
9319 if (WARN_ON_ONCE(size >= 1 << 12))
9322 prule->handle = rule->handle;
9328 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9331 if (WARN_ON_ONCE(data > data_boundary))
9334 prule = (struct nft_rule_dp *)data;
9335 nft_last_rule(chain, prule);
9340 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9342 struct nftables_pernet *nft_net = nft_pernet(net);
9343 struct nft_trans *trans, *next;
9345 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9346 struct nft_chain *chain = trans->ctx.chain;
9348 if (trans->msg_type == NFT_MSG_NEWRULE ||
9349 trans->msg_type == NFT_MSG_DELRULE) {
9350 kvfree(chain->blob_next);
9351 chain->blob_next = NULL;
9356 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9358 struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9363 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9365 struct nft_rule_dp_last *last;
9367 /* last rule trailer is after end marker */
9368 last = (void *)blob + sizeof(*blob) + blob->size;
9371 call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9374 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9376 struct nft_rule_blob *g0, *g1;
9379 next_genbit = nft_gencursor_next(net);
9381 g0 = rcu_dereference_protected(chain->blob_gen_0,
9382 lockdep_commit_lock_is_held(net));
9383 g1 = rcu_dereference_protected(chain->blob_gen_1,
9384 lockdep_commit_lock_is_held(net));
9386 /* No changes to this chain? */
9387 if (chain->blob_next == NULL) {
9388 /* chain had no change in last or next generation */
9392 * chain had no change in this generation; make sure next
9393 * one uses same rules as current generation.
9396 rcu_assign_pointer(chain->blob_gen_1, g0);
9397 nf_tables_commit_chain_free_rules_old(g1);
9399 rcu_assign_pointer(chain->blob_gen_0, g1);
9400 nf_tables_commit_chain_free_rules_old(g0);
9407 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9409 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9411 chain->blob_next = NULL;
9417 nf_tables_commit_chain_free_rules_old(g1);
9419 nf_tables_commit_chain_free_rules_old(g0);
9422 static void nft_obj_del(struct nft_object *obj)
9424 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9425 list_del_rcu(&obj->list);
9428 void nft_chain_del(struct nft_chain *chain)
9430 struct nft_table *table = chain->table;
9432 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9433 nft_chain_ht_params));
9434 list_del_rcu(&chain->list);
9437 static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
9438 struct nft_trans_gc *trans)
9440 void **priv = trans->priv;
9443 for (i = 0; i < trans->count; i++) {
9444 struct nft_set_elem elem = {
9448 nft_setelem_data_deactivate(ctx->net, trans->set, &elem);
9449 nft_setelem_remove(ctx->net, trans->set, &elem);
9453 void nft_trans_gc_destroy(struct nft_trans_gc *trans)
9455 nft_set_put(trans->set);
9456 put_net(trans->net);
9460 static void nft_trans_gc_trans_free(struct rcu_head *rcu)
9462 struct nft_set_elem elem = {};
9463 struct nft_trans_gc *trans;
9464 struct nft_ctx ctx = {};
9467 trans = container_of(rcu, struct nft_trans_gc, rcu);
9468 ctx.net = read_pnet(&trans->set->net);
9470 for (i = 0; i < trans->count; i++) {
9471 elem.priv = trans->priv[i];
9472 if (!nft_setelem_is_catchall(trans->set, &elem))
9473 atomic_dec(&trans->set->nelems);
9475 nf_tables_set_elem_destroy(&ctx, trans->set, elem.priv);
9478 nft_trans_gc_destroy(trans);
9481 static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
9483 struct nftables_pernet *nft_net;
9484 struct nft_ctx ctx = {};
9486 nft_net = nft_pernet(trans->net);
9488 mutex_lock(&nft_net->commit_mutex);
9490 /* Check for race with transaction, otherwise this batch refers to
9491 * stale objects that might not be there anymore. Skip transaction if
9492 * set has been destroyed from control plane transaction in case gc
9493 * worker loses race.
9495 if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
9496 mutex_unlock(&nft_net->commit_mutex);
9500 ctx.net = trans->net;
9501 ctx.table = trans->set->table;
9503 nft_trans_gc_setelem_remove(&ctx, trans);
9504 mutex_unlock(&nft_net->commit_mutex);
9509 static void nft_trans_gc_work(struct work_struct *work)
9511 struct nft_trans_gc *trans, *next;
9512 LIST_HEAD(trans_gc_list);
9514 spin_lock(&nf_tables_gc_list_lock);
9515 list_splice_init(&nf_tables_gc_list, &trans_gc_list);
9516 spin_unlock(&nf_tables_gc_list_lock);
9518 list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
9519 list_del(&trans->list);
9520 if (!nft_trans_gc_work_done(trans)) {
9521 nft_trans_gc_destroy(trans);
9524 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9528 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
9529 unsigned int gc_seq, gfp_t gfp)
9531 struct net *net = read_pnet(&set->net);
9532 struct nft_trans_gc *trans;
9534 trans = kzalloc(sizeof(*trans), gfp);
9538 trans->net = maybe_get_net(net);
9544 refcount_inc(&set->refs);
9546 trans->seq = gc_seq;
9551 void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
9553 trans->priv[trans->count++] = priv;
9556 static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
9558 spin_lock(&nf_tables_gc_list_lock);
9559 list_add_tail(&trans->list, &nf_tables_gc_list);
9560 spin_unlock(&nf_tables_gc_list_lock);
9562 schedule_work(&trans_gc_work);
9565 static int nft_trans_gc_space(struct nft_trans_gc *trans)
9567 return NFT_TRANS_GC_BATCHCOUNT - trans->count;
9570 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
9571 unsigned int gc_seq, gfp_t gfp)
9573 if (nft_trans_gc_space(gc))
9576 nft_trans_gc_queue_work(gc);
9578 return nft_trans_gc_alloc(gc->set, gc_seq, gfp);
9581 void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
9583 if (trans->count == 0) {
9584 nft_trans_gc_destroy(trans);
9588 nft_trans_gc_queue_work(trans);
9591 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
9593 if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
9596 if (nft_trans_gc_space(gc))
9599 call_rcu(&gc->rcu, nft_trans_gc_trans_free);
9601 return nft_trans_gc_alloc(gc->set, 0, gfp);
9604 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
9606 WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
9608 if (trans->count == 0) {
9609 nft_trans_gc_destroy(trans);
9613 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9616 struct nft_trans_gc *nft_trans_gc_catchall(struct nft_trans_gc *gc,
9617 unsigned int gc_seq)
9619 struct nft_set_elem_catchall *catchall;
9620 const struct nft_set *set = gc->set;
9621 struct nft_set_ext *ext;
9623 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9624 ext = nft_set_elem_ext(set, catchall->elem);
9626 if (!nft_set_elem_expired(ext))
9628 if (nft_set_elem_is_dead(ext))
9631 nft_set_elem_dead(ext);
9633 gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
9637 nft_trans_gc_elem_add(gc, catchall->elem);
9643 static void nf_tables_module_autoload_cleanup(struct net *net)
9645 struct nftables_pernet *nft_net = nft_pernet(net);
9646 struct nft_module_request *req, *next;
9648 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9649 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9650 WARN_ON_ONCE(!req->done);
9651 list_del(&req->list);
9656 static void nf_tables_commit_release(struct net *net)
9658 struct nftables_pernet *nft_net = nft_pernet(net);
9659 struct nft_trans *trans;
9661 /* all side effects have to be made visible.
9662 * For example, if a chain named 'foo' has been deleted, a
9663 * new transaction must not find it anymore.
9665 * Memory reclaim happens asynchronously from work queue
9666 * to prevent expensive synchronize_rcu() in commit phase.
9668 if (list_empty(&nft_net->commit_list)) {
9669 nf_tables_module_autoload_cleanup(net);
9670 mutex_unlock(&nft_net->commit_mutex);
9674 trans = list_last_entry(&nft_net->commit_list,
9675 struct nft_trans, list);
9676 get_net(trans->ctx.net);
9677 WARN_ON_ONCE(trans->put_net);
9679 trans->put_net = true;
9680 spin_lock(&nf_tables_destroy_list_lock);
9681 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9682 spin_unlock(&nf_tables_destroy_list_lock);
9684 nf_tables_module_autoload_cleanup(net);
9685 schedule_work(&trans_destroy_work);
9687 mutex_unlock(&nft_net->commit_mutex);
9690 static void nft_commit_notify(struct net *net, u32 portid)
9692 struct nftables_pernet *nft_net = nft_pernet(net);
9693 struct sk_buff *batch_skb = NULL, *nskb, *skb;
9694 unsigned char *data;
9697 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9701 len = NLMSG_GOODSIZE - skb->len;
9702 list_del(&skb->list);
9706 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9707 data = skb_put(batch_skb, skb->len);
9708 memcpy(data, skb->data, skb->len);
9709 list_del(&skb->list);
9713 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9714 NFT_CB(batch_skb).report, GFP_KERNEL);
9719 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9720 NFT_CB(batch_skb).report, GFP_KERNEL);
9723 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9726 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9727 struct nft_table *table)
9729 struct nft_audit_data *adp;
9731 list_for_each_entry(adp, adl, list) {
9732 if (adp->table == table)
9735 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9739 list_add(&adp->list, adl);
9743 static void nf_tables_commit_audit_free(struct list_head *adl)
9745 struct nft_audit_data *adp, *adn;
9747 list_for_each_entry_safe(adp, adn, adl, list) {
9748 list_del(&adp->list);
9753 static void nf_tables_commit_audit_collect(struct list_head *adl,
9754 struct nft_table *table, u32 op)
9756 struct nft_audit_data *adp;
9758 list_for_each_entry(adp, adl, list) {
9759 if (adp->table == table)
9762 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9766 if (!adp->op || adp->op > op)
9770 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9772 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9774 struct nft_audit_data *adp, *adn;
9775 char aubuf[AUNFTABLENAMELEN];
9777 list_for_each_entry_safe(adp, adn, adl, list) {
9778 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9780 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9781 nft2audit_op[adp->op], GFP_KERNEL);
9782 list_del(&adp->list);
9787 static void nft_set_commit_update(struct list_head *set_update_list)
9789 struct nft_set *set, *next;
9791 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9792 list_del_init(&set->pending_update);
9794 if (!set->ops->commit)
9797 set->ops->commit(set);
9801 static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
9803 unsigned int gc_seq;
9805 /* Bump gc counter, it becomes odd, this is the busy mark. */
9806 gc_seq = READ_ONCE(nft_net->gc_seq);
9807 WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9812 static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
9814 WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9817 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9819 struct nftables_pernet *nft_net = nft_pernet(net);
9820 struct nft_trans *trans, *next;
9821 unsigned int base_seq, gc_seq;
9822 LIST_HEAD(set_update_list);
9823 struct nft_trans_elem *te;
9824 struct nft_chain *chain;
9825 struct nft_table *table;
9829 if (list_empty(&nft_net->commit_list)) {
9830 mutex_unlock(&nft_net->commit_mutex);
9834 list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
9835 switch (trans->msg_type) {
9836 case NFT_MSG_NEWSET:
9837 if (!nft_trans_set_update(trans) &&
9838 nft_set_is_anonymous(nft_trans_set(trans)) &&
9839 !nft_trans_set_bound(trans)) {
9840 pr_warn_once("nftables ruleset with unbound set\n");
9844 case NFT_MSG_NEWCHAIN:
9845 if (!nft_trans_chain_update(trans) &&
9846 nft_chain_binding(nft_trans_chain(trans)) &&
9847 !nft_trans_chain_bound(trans)) {
9848 pr_warn_once("nftables ruleset with unbound chain\n");
9855 /* 0. Validate ruleset, otherwise roll back for error reporting. */
9856 if (nf_tables_validate(net) < 0) {
9857 nft_net->validate_state = NFT_VALIDATE_DO;
9861 err = nft_flow_rule_offload_commit(net);
9865 /* 1. Allocate space for next generation rules_gen_X[] */
9866 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9869 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9871 nf_tables_commit_chain_prepare_cancel(net);
9872 nf_tables_commit_audit_free(&adl);
9875 if (trans->msg_type == NFT_MSG_NEWRULE ||
9876 trans->msg_type == NFT_MSG_DELRULE) {
9877 chain = trans->ctx.chain;
9879 ret = nf_tables_commit_chain_prepare(net, chain);
9881 nf_tables_commit_chain_prepare_cancel(net);
9882 nf_tables_commit_audit_free(&adl);
9888 /* step 2. Make rules_gen_X visible to packet path */
9889 list_for_each_entry(table, &nft_net->tables, list) {
9890 list_for_each_entry(chain, &table->chains, list)
9891 nf_tables_commit_chain(net, chain);
9895 * Bump generation counter, invalidate any dump in progress.
9896 * Cannot fail after this point.
9898 base_seq = READ_ONCE(nft_net->base_seq);
9899 while (++base_seq == 0)
9902 WRITE_ONCE(nft_net->base_seq, base_seq);
9904 gc_seq = nft_gc_seq_begin(nft_net);
9906 /* step 3. Start new generation, rules_gen_X now in use. */
9907 net->nft.gencursor = nft_gencursor_next(net);
9909 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9910 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9912 switch (trans->msg_type) {
9913 case NFT_MSG_NEWTABLE:
9914 if (nft_trans_table_update(trans)) {
9915 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9916 nft_trans_destroy(trans);
9919 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9920 nf_tables_table_disable(net, trans->ctx.table);
9922 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9924 nft_clear(net, trans->ctx.table);
9926 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
9927 nft_trans_destroy(trans);
9929 case NFT_MSG_DELTABLE:
9930 case NFT_MSG_DESTROYTABLE:
9931 list_del_rcu(&trans->ctx.table->list);
9932 nf_tables_table_notify(&trans->ctx, trans->msg_type);
9934 case NFT_MSG_NEWCHAIN:
9935 if (nft_trans_chain_update(trans)) {
9936 nft_chain_commit_update(trans);
9937 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
9938 &nft_trans_chain_hooks(trans));
9939 list_splice(&nft_trans_chain_hooks(trans),
9940 &nft_trans_basechain(trans)->hook_list);
9941 /* trans destroyed after rcu grace period */
9943 nft_chain_commit_drop_policy(trans);
9944 nft_clear(net, trans->ctx.chain);
9945 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
9946 nft_trans_destroy(trans);
9949 case NFT_MSG_DELCHAIN:
9950 case NFT_MSG_DESTROYCHAIN:
9951 if (nft_trans_chain_update(trans)) {
9952 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9953 &nft_trans_chain_hooks(trans));
9954 nft_netdev_unregister_hooks(net,
9955 &nft_trans_chain_hooks(trans),
9958 nft_chain_del(trans->ctx.chain);
9959 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9961 nf_tables_unregister_hook(trans->ctx.net,
9966 case NFT_MSG_NEWRULE:
9967 nft_clear(trans->ctx.net, nft_trans_rule(trans));
9968 nf_tables_rule_notify(&trans->ctx,
9969 nft_trans_rule(trans),
9971 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9972 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9974 nft_trans_destroy(trans);
9976 case NFT_MSG_DELRULE:
9977 case NFT_MSG_DESTROYRULE:
9978 list_del_rcu(&nft_trans_rule(trans)->list);
9979 nf_tables_rule_notify(&trans->ctx,
9980 nft_trans_rule(trans),
9982 nft_rule_expr_deactivate(&trans->ctx,
9983 nft_trans_rule(trans),
9986 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9987 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9989 case NFT_MSG_NEWSET:
9990 if (nft_trans_set_update(trans)) {
9991 struct nft_set *set = nft_trans_set(trans);
9993 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
9994 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
9996 if (nft_trans_set_size(trans))
9997 WRITE_ONCE(set->size, nft_trans_set_size(trans));
9999 nft_clear(net, nft_trans_set(trans));
10000 /* This avoids hitting -EBUSY when deleting the table
10001 * from the transaction.
10003 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
10004 !list_empty(&nft_trans_set(trans)->bindings))
10005 nft_use_dec(&trans->ctx.table->use);
10007 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10008 NFT_MSG_NEWSET, GFP_KERNEL);
10009 nft_trans_destroy(trans);
10011 case NFT_MSG_DELSET:
10012 case NFT_MSG_DESTROYSET:
10013 nft_trans_set(trans)->dead = 1;
10014 list_del_rcu(&nft_trans_set(trans)->list);
10015 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10016 trans->msg_type, GFP_KERNEL);
10018 case NFT_MSG_NEWSETELEM:
10019 te = (struct nft_trans_elem *)trans->data;
10021 nft_setelem_activate(net, te->set, &te->elem);
10022 nf_tables_setelem_notify(&trans->ctx, te->set,
10024 NFT_MSG_NEWSETELEM);
10025 if (te->set->ops->commit &&
10026 list_empty(&te->set->pending_update)) {
10027 list_add_tail(&te->set->pending_update,
10030 nft_trans_destroy(trans);
10032 case NFT_MSG_DELSETELEM:
10033 case NFT_MSG_DESTROYSETELEM:
10034 te = (struct nft_trans_elem *)trans->data;
10036 nf_tables_setelem_notify(&trans->ctx, te->set,
10039 nft_setelem_remove(net, te->set, &te->elem);
10040 if (!nft_setelem_is_catchall(te->set, &te->elem)) {
10041 atomic_dec(&te->set->nelems);
10044 if (te->set->ops->commit &&
10045 list_empty(&te->set->pending_update)) {
10046 list_add_tail(&te->set->pending_update,
10050 case NFT_MSG_NEWOBJ:
10051 if (nft_trans_obj_update(trans)) {
10052 nft_obj_commit_update(trans);
10053 nf_tables_obj_notify(&trans->ctx,
10054 nft_trans_obj(trans),
10057 nft_clear(net, nft_trans_obj(trans));
10058 nf_tables_obj_notify(&trans->ctx,
10059 nft_trans_obj(trans),
10061 nft_trans_destroy(trans);
10064 case NFT_MSG_DELOBJ:
10065 case NFT_MSG_DESTROYOBJ:
10066 nft_obj_del(nft_trans_obj(trans));
10067 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
10070 case NFT_MSG_NEWFLOWTABLE:
10071 if (nft_trans_flowtable_update(trans)) {
10072 nft_trans_flowtable(trans)->data.flags =
10073 nft_trans_flowtable_flags(trans);
10074 nf_tables_flowtable_notify(&trans->ctx,
10075 nft_trans_flowtable(trans),
10076 &nft_trans_flowtable_hooks(trans),
10077 NFT_MSG_NEWFLOWTABLE);
10078 list_splice(&nft_trans_flowtable_hooks(trans),
10079 &nft_trans_flowtable(trans)->hook_list);
10081 nft_clear(net, nft_trans_flowtable(trans));
10082 nf_tables_flowtable_notify(&trans->ctx,
10083 nft_trans_flowtable(trans),
10085 NFT_MSG_NEWFLOWTABLE);
10087 nft_trans_destroy(trans);
10089 case NFT_MSG_DELFLOWTABLE:
10090 case NFT_MSG_DESTROYFLOWTABLE:
10091 if (nft_trans_flowtable_update(trans)) {
10092 nf_tables_flowtable_notify(&trans->ctx,
10093 nft_trans_flowtable(trans),
10094 &nft_trans_flowtable_hooks(trans),
10096 nft_unregister_flowtable_net_hooks(net,
10097 &nft_trans_flowtable_hooks(trans));
10099 list_del_rcu(&nft_trans_flowtable(trans)->list);
10100 nf_tables_flowtable_notify(&trans->ctx,
10101 nft_trans_flowtable(trans),
10104 nft_unregister_flowtable_net_hooks(net,
10105 &nft_trans_flowtable(trans)->hook_list);
10111 nft_set_commit_update(&set_update_list);
10113 nft_commit_notify(net, NETLINK_CB(skb).portid);
10114 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
10115 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
10117 nft_gc_seq_end(nft_net, gc_seq);
10118 nft_net->validate_state = NFT_VALIDATE_SKIP;
10119 nf_tables_commit_release(net);
10124 static void nf_tables_module_autoload(struct net *net)
10126 struct nftables_pernet *nft_net = nft_pernet(net);
10127 struct nft_module_request *req, *next;
10128 LIST_HEAD(module_list);
10130 list_splice_init(&nft_net->module_list, &module_list);
10131 mutex_unlock(&nft_net->commit_mutex);
10132 list_for_each_entry_safe(req, next, &module_list, list) {
10133 request_module("%s", req->module);
10136 mutex_lock(&nft_net->commit_mutex);
10137 list_splice(&module_list, &nft_net->module_list);
10140 static void nf_tables_abort_release(struct nft_trans *trans)
10142 switch (trans->msg_type) {
10143 case NFT_MSG_NEWTABLE:
10144 nf_tables_table_destroy(&trans->ctx);
10146 case NFT_MSG_NEWCHAIN:
10147 if (nft_trans_chain_update(trans))
10148 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
10150 nf_tables_chain_destroy(&trans->ctx);
10152 case NFT_MSG_NEWRULE:
10153 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
10155 case NFT_MSG_NEWSET:
10156 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
10158 case NFT_MSG_NEWSETELEM:
10159 nft_set_elem_destroy(nft_trans_elem_set(trans),
10160 nft_trans_elem(trans).priv, true);
10162 case NFT_MSG_NEWOBJ:
10163 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
10165 case NFT_MSG_NEWFLOWTABLE:
10166 if (nft_trans_flowtable_update(trans))
10167 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
10169 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
10175 static void nft_set_abort_update(struct list_head *set_update_list)
10177 struct nft_set *set, *next;
10179 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10180 list_del_init(&set->pending_update);
10182 if (!set->ops->abort)
10185 set->ops->abort(set);
10189 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
10191 struct nftables_pernet *nft_net = nft_pernet(net);
10192 struct nft_trans *trans, *next;
10193 LIST_HEAD(set_update_list);
10194 struct nft_trans_elem *te;
10196 if (action == NFNL_ABORT_VALIDATE &&
10197 nf_tables_validate(net) < 0)
10200 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
10202 switch (trans->msg_type) {
10203 case NFT_MSG_NEWTABLE:
10204 if (nft_trans_table_update(trans)) {
10205 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10206 nft_trans_destroy(trans);
10209 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
10210 nf_tables_table_disable(net, trans->ctx.table);
10211 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
10212 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
10213 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
10215 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10216 nft_trans_destroy(trans);
10218 list_del_rcu(&trans->ctx.table->list);
10221 case NFT_MSG_DELTABLE:
10222 case NFT_MSG_DESTROYTABLE:
10223 nft_clear(trans->ctx.net, trans->ctx.table);
10224 nft_trans_destroy(trans);
10226 case NFT_MSG_NEWCHAIN:
10227 if (nft_trans_chain_update(trans)) {
10228 nft_netdev_unregister_hooks(net,
10229 &nft_trans_chain_hooks(trans),
10231 free_percpu(nft_trans_chain_stats(trans));
10232 kfree(nft_trans_chain_name(trans));
10233 nft_trans_destroy(trans);
10235 if (nft_trans_chain_bound(trans)) {
10236 nft_trans_destroy(trans);
10239 nft_use_dec_restore(&trans->ctx.table->use);
10240 nft_chain_del(trans->ctx.chain);
10241 nf_tables_unregister_hook(trans->ctx.net,
10246 case NFT_MSG_DELCHAIN:
10247 case NFT_MSG_DESTROYCHAIN:
10248 if (nft_trans_chain_update(trans)) {
10249 list_splice(&nft_trans_chain_hooks(trans),
10250 &nft_trans_basechain(trans)->hook_list);
10252 nft_use_inc_restore(&trans->ctx.table->use);
10253 nft_clear(trans->ctx.net, trans->ctx.chain);
10255 nft_trans_destroy(trans);
10257 case NFT_MSG_NEWRULE:
10258 if (nft_trans_rule_bound(trans)) {
10259 nft_trans_destroy(trans);
10262 nft_use_dec_restore(&trans->ctx.chain->use);
10263 list_del_rcu(&nft_trans_rule(trans)->list);
10264 nft_rule_expr_deactivate(&trans->ctx,
10265 nft_trans_rule(trans),
10267 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10268 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10270 case NFT_MSG_DELRULE:
10271 case NFT_MSG_DESTROYRULE:
10272 nft_use_inc_restore(&trans->ctx.chain->use);
10273 nft_clear(trans->ctx.net, nft_trans_rule(trans));
10274 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10275 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10276 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10278 nft_trans_destroy(trans);
10280 case NFT_MSG_NEWSET:
10281 if (nft_trans_set_update(trans)) {
10282 nft_trans_destroy(trans);
10285 nft_use_dec_restore(&trans->ctx.table->use);
10286 if (nft_trans_set_bound(trans)) {
10287 nft_trans_destroy(trans);
10290 list_del_rcu(&nft_trans_set(trans)->list);
10292 case NFT_MSG_DELSET:
10293 case NFT_MSG_DESTROYSET:
10294 nft_use_inc_restore(&trans->ctx.table->use);
10295 nft_clear(trans->ctx.net, nft_trans_set(trans));
10296 if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10297 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10299 nft_trans_destroy(trans);
10301 case NFT_MSG_NEWSETELEM:
10302 if (nft_trans_elem_set_bound(trans)) {
10303 nft_trans_destroy(trans);
10306 te = (struct nft_trans_elem *)trans->data;
10307 nft_setelem_remove(net, te->set, &te->elem);
10308 if (!nft_setelem_is_catchall(te->set, &te->elem))
10309 atomic_dec(&te->set->nelems);
10311 if (te->set->ops->abort &&
10312 list_empty(&te->set->pending_update)) {
10313 list_add_tail(&te->set->pending_update,
10317 case NFT_MSG_DELSETELEM:
10318 case NFT_MSG_DESTROYSETELEM:
10319 te = (struct nft_trans_elem *)trans->data;
10321 nft_setelem_data_activate(net, te->set, &te->elem);
10322 nft_setelem_activate(net, te->set, &te->elem);
10323 if (!nft_setelem_is_catchall(te->set, &te->elem))
10326 if (te->set->ops->abort &&
10327 list_empty(&te->set->pending_update)) {
10328 list_add_tail(&te->set->pending_update,
10331 nft_trans_destroy(trans);
10333 case NFT_MSG_NEWOBJ:
10334 if (nft_trans_obj_update(trans)) {
10335 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10336 nft_trans_destroy(trans);
10338 nft_use_dec_restore(&trans->ctx.table->use);
10339 nft_obj_del(nft_trans_obj(trans));
10342 case NFT_MSG_DELOBJ:
10343 case NFT_MSG_DESTROYOBJ:
10344 nft_use_inc_restore(&trans->ctx.table->use);
10345 nft_clear(trans->ctx.net, nft_trans_obj(trans));
10346 nft_trans_destroy(trans);
10348 case NFT_MSG_NEWFLOWTABLE:
10349 if (nft_trans_flowtable_update(trans)) {
10350 nft_unregister_flowtable_net_hooks(net,
10351 &nft_trans_flowtable_hooks(trans));
10353 nft_use_dec_restore(&trans->ctx.table->use);
10354 list_del_rcu(&nft_trans_flowtable(trans)->list);
10355 nft_unregister_flowtable_net_hooks(net,
10356 &nft_trans_flowtable(trans)->hook_list);
10359 case NFT_MSG_DELFLOWTABLE:
10360 case NFT_MSG_DESTROYFLOWTABLE:
10361 if (nft_trans_flowtable_update(trans)) {
10362 list_splice(&nft_trans_flowtable_hooks(trans),
10363 &nft_trans_flowtable(trans)->hook_list);
10365 nft_use_inc_restore(&trans->ctx.table->use);
10366 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10368 nft_trans_destroy(trans);
10373 nft_set_abort_update(&set_update_list);
10377 list_for_each_entry_safe_reverse(trans, next,
10378 &nft_net->commit_list, list) {
10379 nft_trans_list_del(trans);
10380 nf_tables_abort_release(trans);
10383 if (action == NFNL_ABORT_AUTOLOAD)
10384 nf_tables_module_autoload(net);
10386 nf_tables_module_autoload_cleanup(net);
10391 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10392 enum nfnl_abort_action action)
10394 struct nftables_pernet *nft_net = nft_pernet(net);
10395 unsigned int gc_seq;
10398 gc_seq = nft_gc_seq_begin(nft_net);
10399 ret = __nf_tables_abort(net, action);
10400 nft_gc_seq_end(nft_net, gc_seq);
10401 mutex_unlock(&nft_net->commit_mutex);
10406 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10408 struct nftables_pernet *nft_net = nft_pernet(net);
10411 mutex_lock(&nft_net->commit_mutex);
10413 genid_ok = genid == 0 || nft_net->base_seq == genid;
10415 mutex_unlock(&nft_net->commit_mutex);
10417 /* else, commit mutex has to be released by commit or abort function */
10421 static const struct nfnetlink_subsystem nf_tables_subsys = {
10422 .name = "nf_tables",
10423 .subsys_id = NFNL_SUBSYS_NFTABLES,
10424 .cb_count = NFT_MSG_MAX,
10425 .cb = nf_tables_cb,
10426 .commit = nf_tables_commit,
10427 .abort = nf_tables_abort,
10428 .valid_genid = nf_tables_valid_genid,
10429 .owner = THIS_MODULE,
10432 int nft_chain_validate_dependency(const struct nft_chain *chain,
10433 enum nft_chain_types type)
10435 const struct nft_base_chain *basechain;
10437 if (nft_is_base_chain(chain)) {
10438 basechain = nft_base_chain(chain);
10439 if (basechain->type->type != type)
10440 return -EOPNOTSUPP;
10444 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10446 int nft_chain_validate_hooks(const struct nft_chain *chain,
10447 unsigned int hook_flags)
10449 struct nft_base_chain *basechain;
10451 if (nft_is_base_chain(chain)) {
10452 basechain = nft_base_chain(chain);
10454 if ((1 << basechain->ops.hooknum) & hook_flags)
10457 return -EOPNOTSUPP;
10462 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10465 * Loop detection - walk through the ruleset beginning at the destination chain
10466 * of a new jump until either the source chain is reached (loop) or all
10467 * reachable chains have been traversed.
10469 * The loop check is performed whenever a new jump verdict is added to an
10470 * expression or verdict map or a verdict map is bound to a new chain.
10473 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10474 const struct nft_chain *chain);
10476 static int nft_check_loops(const struct nft_ctx *ctx,
10477 const struct nft_set_ext *ext)
10479 const struct nft_data *data;
10482 data = nft_set_ext_data(ext);
10483 switch (data->verdict.code) {
10486 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10496 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10497 struct nft_set *set,
10498 const struct nft_set_iter *iter,
10499 struct nft_set_elem *elem)
10501 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
10503 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10504 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10507 return nft_check_loops(ctx, ext);
10510 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10511 struct nft_set *set)
10513 u8 genmask = nft_genmask_next(ctx->net);
10514 struct nft_set_elem_catchall *catchall;
10515 struct nft_set_ext *ext;
10518 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10519 ext = nft_set_elem_ext(set, catchall->elem);
10520 if (!nft_set_elem_active(ext, genmask))
10523 ret = nft_check_loops(ctx, ext);
10531 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10532 const struct nft_chain *chain)
10534 const struct nft_rule *rule;
10535 const struct nft_expr *expr, *last;
10536 struct nft_set *set;
10537 struct nft_set_binding *binding;
10538 struct nft_set_iter iter;
10540 if (ctx->chain == chain)
10543 if (fatal_signal_pending(current))
10546 list_for_each_entry(rule, &chain->rules, list) {
10547 nft_rule_for_each_expr(expr, last, rule) {
10548 struct nft_immediate_expr *priv;
10549 const struct nft_data *data;
10552 if (strcmp(expr->ops->type->name, "immediate"))
10555 priv = nft_expr_priv(expr);
10556 if (priv->dreg != NFT_REG_VERDICT)
10559 data = &priv->data;
10560 switch (data->verdict.code) {
10563 err = nf_tables_check_loops(ctx,
10564 data->verdict.chain);
10574 list_for_each_entry(set, &ctx->table->sets, list) {
10575 if (!nft_is_active_next(ctx->net, set))
10577 if (!(set->flags & NFT_SET_MAP) ||
10578 set->dtype != NFT_DATA_VERDICT)
10581 list_for_each_entry(binding, &set->bindings, list) {
10582 if (!(binding->flags & NFT_SET_MAP) ||
10583 binding->chain != chain)
10586 iter.genmask = nft_genmask_next(ctx->net);
10590 iter.fn = nf_tables_loop_check_setelem;
10592 set->ops->walk(ctx, set, &iter);
10594 iter.err = nft_set_catchall_loops(ctx, set);
10605 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
10607 * @attr: netlink attribute to fetch value from
10608 * @max: maximum value to be stored in dest
10609 * @dest: pointer to the variable
10611 * Parse, check and store a given u32 netlink attribute into variable.
10612 * This function returns -ERANGE if the value goes over maximum value.
10613 * Otherwise a 0 is returned and the attribute value is stored in the
10614 * destination variable.
10616 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10620 val = ntohl(nla_get_be32(attr));
10627 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10629 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10633 reg = ntohl(nla_get_be32(attr));
10635 case NFT_REG_VERDICT...NFT_REG_4:
10636 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10638 case NFT_REG32_00...NFT_REG32_15:
10639 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10649 * nft_dump_register - dump a register value to a netlink attribute
10651 * @skb: socket buffer
10652 * @attr: attribute number
10653 * @reg: register number
10655 * Construct a netlink attribute containing the register number. For
10656 * compatibility reasons, register numbers being a multiple of 4 are
10657 * translated to the corresponding 128 bit register numbers.
10659 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10661 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10662 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10664 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10666 return nla_put_be32(skb, attr, htonl(reg));
10668 EXPORT_SYMBOL_GPL(nft_dump_register);
10670 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10672 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10676 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10682 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10687 err = nft_parse_register(attr, ®);
10691 err = nft_validate_register_load(reg, len);
10698 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10700 static int nft_validate_register_store(const struct nft_ctx *ctx,
10701 enum nft_registers reg,
10702 const struct nft_data *data,
10703 enum nft_data_types type,
10709 case NFT_REG_VERDICT:
10710 if (type != NFT_DATA_VERDICT)
10713 if (data != NULL &&
10714 (data->verdict.code == NFT_GOTO ||
10715 data->verdict.code == NFT_JUMP)) {
10716 err = nf_tables_check_loops(ctx, data->verdict.chain);
10723 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10727 if (reg * NFT_REG32_SIZE + len >
10728 sizeof_field(struct nft_regs, data))
10731 if (data != NULL && type != NFT_DATA_VALUE)
10737 int nft_parse_register_store(const struct nft_ctx *ctx,
10738 const struct nlattr *attr, u8 *dreg,
10739 const struct nft_data *data,
10740 enum nft_data_types type, unsigned int len)
10745 err = nft_parse_register(attr, ®);
10749 err = nft_validate_register_store(ctx, reg, data, type, len);
10756 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10758 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10759 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
10760 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
10761 .len = NFT_CHAIN_MAXNAMELEN - 1 },
10762 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10765 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10766 struct nft_data_desc *desc, const struct nlattr *nla)
10768 u8 genmask = nft_genmask_next(ctx->net);
10769 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10770 struct nft_chain *chain;
10773 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10774 nft_verdict_policy, NULL);
10778 if (!tb[NFTA_VERDICT_CODE])
10781 /* zero padding hole for memcmp */
10782 memset(data, 0, sizeof(*data));
10783 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10785 switch (data->verdict.code) {
10787 switch (data->verdict.code & NF_VERDICT_MASK) {
10802 if (tb[NFTA_VERDICT_CHAIN]) {
10803 chain = nft_chain_lookup(ctx->net, ctx->table,
10804 tb[NFTA_VERDICT_CHAIN],
10806 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10807 chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10808 tb[NFTA_VERDICT_CHAIN_ID],
10811 return PTR_ERR(chain);
10817 return PTR_ERR(chain);
10818 if (nft_is_base_chain(chain))
10819 return -EOPNOTSUPP;
10820 if (nft_chain_is_bound(chain))
10822 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10823 chain->flags & NFT_CHAIN_BINDING)
10825 if (!nft_use_inc(&chain->use))
10828 data->verdict.chain = chain;
10832 desc->len = sizeof(data->verdict);
10837 static void nft_verdict_uninit(const struct nft_data *data)
10839 struct nft_chain *chain;
10841 switch (data->verdict.code) {
10844 chain = data->verdict.chain;
10845 nft_use_dec(&chain->use);
10850 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10852 struct nlattr *nest;
10854 nest = nla_nest_start_noflag(skb, type);
10856 goto nla_put_failure;
10858 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10859 goto nla_put_failure;
10864 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10866 goto nla_put_failure;
10868 nla_nest_end(skb, nest);
10875 static int nft_value_init(const struct nft_ctx *ctx,
10876 struct nft_data *data, struct nft_data_desc *desc,
10877 const struct nlattr *nla)
10881 len = nla_len(nla);
10884 if (len > desc->size)
10887 if (len != desc->len)
10893 nla_memcpy(data->data, nla, len);
10898 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10901 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10904 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10905 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
10906 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
10910 * nft_data_init - parse nf_tables data netlink attributes
10912 * @ctx: context of the expression using the data
10913 * @data: destination struct nft_data
10914 * @desc: data description
10915 * @nla: netlink attribute containing data
10917 * Parse the netlink data attributes and initialize a struct nft_data.
10918 * The type and length of data are returned in the data description.
10920 * The caller can indicate that it only wants to accept data of type
10921 * NFT_DATA_VALUE by passing NULL for the ctx argument.
10923 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
10924 struct nft_data_desc *desc, const struct nlattr *nla)
10926 struct nlattr *tb[NFTA_DATA_MAX + 1];
10929 if (WARN_ON_ONCE(!desc->size))
10932 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
10933 nft_data_policy, NULL);
10937 if (tb[NFTA_DATA_VALUE]) {
10938 if (desc->type != NFT_DATA_VALUE)
10941 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
10942 } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
10943 if (desc->type != NFT_DATA_VERDICT)
10946 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
10953 EXPORT_SYMBOL_GPL(nft_data_init);
10956 * nft_data_release - release a nft_data item
10958 * @data: struct nft_data to release
10959 * @type: type of data
10961 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
10962 * all others need to be released by calling this function.
10964 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
10966 if (type < NFT_DATA_VERDICT)
10969 case NFT_DATA_VERDICT:
10970 return nft_verdict_uninit(data);
10975 EXPORT_SYMBOL_GPL(nft_data_release);
10977 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
10978 enum nft_data_types type, unsigned int len)
10980 struct nlattr *nest;
10983 nest = nla_nest_start_noflag(skb, attr);
10988 case NFT_DATA_VALUE:
10989 err = nft_value_dump(skb, data, len);
10991 case NFT_DATA_VERDICT:
10992 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
10999 nla_nest_end(skb, nest);
11002 EXPORT_SYMBOL_GPL(nft_data_dump);
11004 int __nft_release_basechain(struct nft_ctx *ctx)
11006 struct nft_rule *rule, *nr;
11008 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
11011 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
11012 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
11013 list_del(&rule->list);
11014 nft_use_dec(&ctx->chain->use);
11015 nf_tables_rule_release(ctx, rule);
11017 nft_chain_del(ctx->chain);
11018 nft_use_dec(&ctx->table->use);
11019 nf_tables_chain_destroy(ctx);
11023 EXPORT_SYMBOL_GPL(__nft_release_basechain);
11025 static void __nft_release_hook(struct net *net, struct nft_table *table)
11027 struct nft_flowtable *flowtable;
11028 struct nft_chain *chain;
11030 list_for_each_entry(chain, &table->chains, list)
11031 __nf_tables_unregister_hook(net, table, chain, true);
11032 list_for_each_entry(flowtable, &table->flowtables, list)
11033 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
11037 static void __nft_release_hooks(struct net *net)
11039 struct nftables_pernet *nft_net = nft_pernet(net);
11040 struct nft_table *table;
11042 list_for_each_entry(table, &nft_net->tables, list) {
11043 if (nft_table_has_owner(table))
11046 __nft_release_hook(net, table);
11050 static void __nft_release_table(struct net *net, struct nft_table *table)
11052 struct nft_flowtable *flowtable, *nf;
11053 struct nft_chain *chain, *nc;
11054 struct nft_object *obj, *ne;
11055 struct nft_rule *rule, *nr;
11056 struct nft_set *set, *ns;
11057 struct nft_ctx ctx = {
11059 .family = NFPROTO_NETDEV,
11062 ctx.family = table->family;
11064 list_for_each_entry(chain, &table->chains, list) {
11065 if (nft_chain_binding(chain))
11069 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
11070 list_del(&rule->list);
11071 nft_use_dec(&chain->use);
11072 nf_tables_rule_release(&ctx, rule);
11075 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
11076 list_del(&flowtable->list);
11077 nft_use_dec(&table->use);
11078 nf_tables_flowtable_destroy(flowtable);
11080 list_for_each_entry_safe(set, ns, &table->sets, list) {
11081 list_del(&set->list);
11082 nft_use_dec(&table->use);
11083 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
11084 nft_map_deactivate(&ctx, set);
11086 nft_set_destroy(&ctx, set);
11088 list_for_each_entry_safe(obj, ne, &table->objects, list) {
11090 nft_use_dec(&table->use);
11091 nft_obj_destroy(&ctx, obj);
11093 list_for_each_entry_safe(chain, nc, &table->chains, list) {
11095 nft_chain_del(chain);
11096 nft_use_dec(&table->use);
11097 nf_tables_chain_destroy(&ctx);
11099 nf_tables_table_destroy(&ctx);
11102 static void __nft_release_tables(struct net *net)
11104 struct nftables_pernet *nft_net = nft_pernet(net);
11105 struct nft_table *table, *nt;
11107 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
11108 if (nft_table_has_owner(table))
11111 list_del(&table->list);
11113 __nft_release_table(net, table);
11117 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
11120 struct nft_table *table, *to_delete[8];
11121 struct nftables_pernet *nft_net;
11122 struct netlink_notify *n = ptr;
11123 struct net *net = n->net;
11124 unsigned int deleted;
11125 bool restart = false;
11126 unsigned int gc_seq;
11128 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
11129 return NOTIFY_DONE;
11131 nft_net = nft_pernet(net);
11133 mutex_lock(&nft_net->commit_mutex);
11135 gc_seq = nft_gc_seq_begin(nft_net);
11137 if (!list_empty(&nf_tables_destroy_list))
11138 nf_tables_trans_destroy_flush_work();
11140 list_for_each_entry(table, &nft_net->tables, list) {
11141 if (nft_table_has_owner(table) &&
11142 n->portid == table->nlpid) {
11143 __nft_release_hook(net, table);
11144 list_del_rcu(&table->list);
11145 to_delete[deleted++] = table;
11146 if (deleted >= ARRAY_SIZE(to_delete))
11151 restart = deleted >= ARRAY_SIZE(to_delete);
11154 __nft_release_table(net, to_delete[--deleted]);
11159 nft_gc_seq_end(nft_net, gc_seq);
11161 mutex_unlock(&nft_net->commit_mutex);
11163 return NOTIFY_DONE;
11166 static struct notifier_block nft_nl_notifier = {
11167 .notifier_call = nft_rcv_nl_event,
11170 static int __net_init nf_tables_init_net(struct net *net)
11172 struct nftables_pernet *nft_net = nft_pernet(net);
11174 INIT_LIST_HEAD(&nft_net->tables);
11175 INIT_LIST_HEAD(&nft_net->commit_list);
11176 INIT_LIST_HEAD(&nft_net->binding_list);
11177 INIT_LIST_HEAD(&nft_net->module_list);
11178 INIT_LIST_HEAD(&nft_net->notify_list);
11179 mutex_init(&nft_net->commit_mutex);
11180 nft_net->base_seq = 1;
11181 nft_net->gc_seq = 0;
11182 nft_net->validate_state = NFT_VALIDATE_SKIP;
11187 static void __net_exit nf_tables_pre_exit_net(struct net *net)
11189 struct nftables_pernet *nft_net = nft_pernet(net);
11191 mutex_lock(&nft_net->commit_mutex);
11192 __nft_release_hooks(net);
11193 mutex_unlock(&nft_net->commit_mutex);
11196 static void __net_exit nf_tables_exit_net(struct net *net)
11198 struct nftables_pernet *nft_net = nft_pernet(net);
11199 unsigned int gc_seq;
11201 mutex_lock(&nft_net->commit_mutex);
11203 gc_seq = nft_gc_seq_begin(nft_net);
11205 if (!list_empty(&nft_net->commit_list) ||
11206 !list_empty(&nft_net->module_list))
11207 __nf_tables_abort(net, NFNL_ABORT_NONE);
11209 __nft_release_tables(net);
11211 nft_gc_seq_end(nft_net, gc_seq);
11213 mutex_unlock(&nft_net->commit_mutex);
11214 WARN_ON_ONCE(!list_empty(&nft_net->tables));
11215 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
11216 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
11219 static void nf_tables_exit_batch(struct list_head *net_exit_list)
11221 flush_work(&trans_gc_work);
11224 static struct pernet_operations nf_tables_net_ops = {
11225 .init = nf_tables_init_net,
11226 .pre_exit = nf_tables_pre_exit_net,
11227 .exit = nf_tables_exit_net,
11228 .exit_batch = nf_tables_exit_batch,
11229 .id = &nf_tables_net_id,
11230 .size = sizeof(struct nftables_pernet),
11233 static int __init nf_tables_module_init(void)
11237 err = register_pernet_subsys(&nf_tables_net_ops);
11241 err = nft_chain_filter_init();
11243 goto err_chain_filter;
11245 err = nf_tables_core_module_init();
11247 goto err_core_module;
11249 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
11251 goto err_netdev_notifier;
11253 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
11255 goto err_rht_objname;
11257 err = nft_offload_init();
11261 err = netlink_register_notifier(&nft_nl_notifier);
11263 goto err_netlink_notifier;
11266 err = nfnetlink_subsys_register(&nf_tables_subsys);
11268 goto err_nfnl_subsys;
11270 nft_chain_route_init();
11275 netlink_unregister_notifier(&nft_nl_notifier);
11276 err_netlink_notifier:
11277 nft_offload_exit();
11279 rhltable_destroy(&nft_objname_ht);
11281 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11282 err_netdev_notifier:
11283 nf_tables_core_module_exit();
11285 nft_chain_filter_fini();
11287 unregister_pernet_subsys(&nf_tables_net_ops);
11291 static void __exit nf_tables_module_exit(void)
11293 nfnetlink_subsys_unregister(&nf_tables_subsys);
11294 netlink_unregister_notifier(&nft_nl_notifier);
11295 nft_offload_exit();
11296 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11297 nft_chain_filter_fini();
11298 nft_chain_route_fini();
11299 unregister_pernet_subsys(&nf_tables_net_ops);
11300 cancel_work_sync(&trans_gc_work);
11301 cancel_work_sync(&trans_destroy_work);
11303 rhltable_destroy(&nft_objname_ht);
11304 nf_tables_core_module_exit();
11307 module_init(nf_tables_module_init);
11308 module_exit(nf_tables_module_exit);
11310 MODULE_LICENSE("GPL");
11311 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11312 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);