1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
5 * Development of this code funded by Astaro AG (http://www.astaro.com/)
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/list.h>
11 #include <linux/skbuff.h>
12 #include <linux/netlink.h>
13 #include <linux/vmalloc.h>
14 #include <linux/rhashtable.h>
15 #include <linux/audit.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_flow_table.h>
20 #include <net/netfilter/nf_tables_core.h>
21 #include <net/netfilter/nf_tables.h>
22 #include <net/netfilter/nf_tables_offload.h>
23 #include <net/net_namespace.h>
26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
28 unsigned int nf_tables_net_id __read_mostly;
30 static LIST_HEAD(nf_tables_expressions);
31 static LIST_HEAD(nf_tables_objects);
32 static LIST_HEAD(nf_tables_flowtables);
33 static LIST_HEAD(nf_tables_destroy_list);
34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
37 NFT_VALIDATE_SKIP = 0,
42 static struct rhltable nft_objname_ht;
44 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
45 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
46 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
48 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
49 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
50 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
52 static const struct rhashtable_params nft_chain_ht_params = {
53 .head_offset = offsetof(struct nft_chain, rhlhead),
54 .key_offset = offsetof(struct nft_chain, name),
55 .hashfn = nft_chain_hash,
56 .obj_hashfn = nft_chain_hash_obj,
57 .obj_cmpfn = nft_chain_hash_cmp,
58 .automatic_shrinking = true,
61 static const struct rhashtable_params nft_objname_ht_params = {
62 .head_offset = offsetof(struct nft_object, rhlhead),
63 .key_offset = offsetof(struct nft_object, key),
64 .hashfn = nft_objname_hash,
65 .obj_hashfn = nft_objname_hash_obj,
66 .obj_cmpfn = nft_objname_hash_cmp,
67 .automatic_shrinking = true,
70 struct nft_audit_data {
71 struct nft_table *table;
74 struct list_head list;
77 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
78 [NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER,
79 [NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID,
80 [NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER,
81 [NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER,
82 [NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID,
83 [NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER,
84 [NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER,
85 [NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID,
86 [NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER,
87 [NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER,
88 [NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID,
89 [NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER,
90 [NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER,
91 [NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID,
92 [NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER,
93 [NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER,
94 [NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID,
95 [NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID,
96 [NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER,
97 [NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID,
98 [NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER,
99 [NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET,
100 [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
101 [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
102 [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
105 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
107 switch (table->validate_state) {
108 case NFT_VALIDATE_SKIP:
109 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
111 case NFT_VALIDATE_NEED:
113 case NFT_VALIDATE_DO:
114 if (new_validate_state == NFT_VALIDATE_NEED)
118 table->validate_state = new_validate_state;
120 static void nf_tables_trans_destroy_work(struct work_struct *w);
121 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
123 static void nft_ctx_init(struct nft_ctx *ctx,
125 const struct sk_buff *skb,
126 const struct nlmsghdr *nlh,
128 struct nft_table *table,
129 struct nft_chain *chain,
130 const struct nlattr * const *nla)
133 ctx->family = family;
138 ctx->portid = NETLINK_CB(skb).portid;
139 ctx->report = nlmsg_report(nlh);
140 ctx->flags = nlh->nlmsg_flags;
141 ctx->seq = nlh->nlmsg_seq;
144 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
145 int msg_type, u32 size, gfp_t gfp)
147 struct nft_trans *trans;
149 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
153 INIT_LIST_HEAD(&trans->list);
154 INIT_LIST_HEAD(&trans->binding_list);
155 trans->msg_type = msg_type;
161 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
162 int msg_type, u32 size)
164 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
167 static void nft_trans_list_del(struct nft_trans *trans)
169 list_del(&trans->list);
170 list_del(&trans->binding_list);
173 static void nft_trans_destroy(struct nft_trans *trans)
175 nft_trans_list_del(trans);
179 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
182 struct nftables_pernet *nft_net;
183 struct net *net = ctx->net;
184 struct nft_trans *trans;
186 if (!nft_set_is_anonymous(set))
189 nft_net = nft_pernet(net);
190 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
191 switch (trans->msg_type) {
193 if (nft_trans_set(trans) == set)
194 nft_trans_set_bound(trans) = bind;
196 case NFT_MSG_NEWSETELEM:
197 if (nft_trans_elem_set(trans) == set)
198 nft_trans_elem_set_bound(trans) = bind;
204 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
206 return __nft_set_trans_bind(ctx, set, true);
209 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
211 return __nft_set_trans_bind(ctx, set, false);
214 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
215 struct nft_chain *chain, bool bind)
217 struct nftables_pernet *nft_net;
218 struct net *net = ctx->net;
219 struct nft_trans *trans;
221 if (!nft_chain_binding(chain))
224 nft_net = nft_pernet(net);
225 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
226 switch (trans->msg_type) {
227 case NFT_MSG_NEWCHAIN:
228 if (nft_trans_chain(trans) == chain)
229 nft_trans_chain_bound(trans) = bind;
231 case NFT_MSG_NEWRULE:
232 if (trans->ctx.chain == chain)
233 nft_trans_rule_bound(trans) = bind;
239 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
240 struct nft_chain *chain)
242 __nft_chain_trans_bind(ctx, chain, true);
245 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
247 if (!nft_chain_binding(chain))
250 if (nft_chain_binding(ctx->chain))
258 nft_chain_trans_bind(ctx, chain);
263 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
265 __nft_chain_trans_bind(ctx, chain, false);
268 static int nft_netdev_register_hooks(struct net *net,
269 struct list_head *hook_list)
271 struct nft_hook *hook;
275 list_for_each_entry(hook, hook_list, list) {
276 err = nf_register_net_hook(net, &hook->ops);
285 list_for_each_entry(hook, hook_list, list) {
289 nf_unregister_net_hook(net, &hook->ops);
294 static void nft_netdev_unregister_hooks(struct net *net,
295 struct list_head *hook_list,
298 struct nft_hook *hook, *next;
300 list_for_each_entry_safe(hook, next, hook_list, list) {
301 nf_unregister_net_hook(net, &hook->ops);
302 if (release_netdev) {
303 list_del(&hook->list);
304 kfree_rcu(hook, rcu);
309 static int nf_tables_register_hook(struct net *net,
310 const struct nft_table *table,
311 struct nft_chain *chain)
313 struct nft_base_chain *basechain;
314 const struct nf_hook_ops *ops;
316 if (table->flags & NFT_TABLE_F_DORMANT ||
317 !nft_is_base_chain(chain))
320 basechain = nft_base_chain(chain);
321 ops = &basechain->ops;
323 if (basechain->type->ops_register)
324 return basechain->type->ops_register(net, ops);
326 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
327 return nft_netdev_register_hooks(net, &basechain->hook_list);
329 return nf_register_net_hook(net, &basechain->ops);
332 static void __nf_tables_unregister_hook(struct net *net,
333 const struct nft_table *table,
334 struct nft_chain *chain,
337 struct nft_base_chain *basechain;
338 const struct nf_hook_ops *ops;
340 if (table->flags & NFT_TABLE_F_DORMANT ||
341 !nft_is_base_chain(chain))
343 basechain = nft_base_chain(chain);
344 ops = &basechain->ops;
346 if (basechain->type->ops_unregister)
347 return basechain->type->ops_unregister(net, ops);
349 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
350 nft_netdev_unregister_hooks(net, &basechain->hook_list,
353 nf_unregister_net_hook(net, &basechain->ops);
356 static void nf_tables_unregister_hook(struct net *net,
357 const struct nft_table *table,
358 struct nft_chain *chain)
360 return __nf_tables_unregister_hook(net, table, chain, false);
363 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
365 struct nftables_pernet *nft_net = nft_pernet(net);
367 switch (trans->msg_type) {
369 if (!nft_trans_set_update(trans) &&
370 nft_set_is_anonymous(nft_trans_set(trans)))
371 list_add_tail(&trans->binding_list, &nft_net->binding_list);
373 case NFT_MSG_NEWCHAIN:
374 if (!nft_trans_chain_update(trans) &&
375 nft_chain_binding(nft_trans_chain(trans)))
376 list_add_tail(&trans->binding_list, &nft_net->binding_list);
380 list_add_tail(&trans->list, &nft_net->commit_list);
383 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
385 struct nft_trans *trans;
387 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
391 if (msg_type == NFT_MSG_NEWTABLE)
392 nft_activate_next(ctx->net, ctx->table);
394 nft_trans_commit_list_add_tail(ctx->net, trans);
398 static int nft_deltable(struct nft_ctx *ctx)
402 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
406 nft_deactivate_next(ctx->net, ctx->table);
410 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
412 struct nft_trans *trans;
414 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
416 return ERR_PTR(-ENOMEM);
418 if (msg_type == NFT_MSG_NEWCHAIN) {
419 nft_activate_next(ctx->net, ctx->chain);
421 if (ctx->nla[NFTA_CHAIN_ID]) {
422 nft_trans_chain_id(trans) =
423 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
426 nft_trans_chain(trans) = ctx->chain;
427 nft_trans_commit_list_add_tail(ctx->net, trans);
432 static int nft_delchain(struct nft_ctx *ctx)
434 struct nft_trans *trans;
436 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
438 return PTR_ERR(trans);
441 nft_deactivate_next(ctx->net, ctx->chain);
446 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
448 struct nft_expr *expr;
450 expr = nft_expr_first(rule);
451 while (nft_expr_more(rule, expr)) {
452 if (expr->ops->activate)
453 expr->ops->activate(ctx, expr);
455 expr = nft_expr_next(expr);
459 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
460 enum nft_trans_phase phase)
462 struct nft_expr *expr;
464 expr = nft_expr_first(rule);
465 while (nft_expr_more(rule, expr)) {
466 if (expr->ops->deactivate)
467 expr->ops->deactivate(ctx, expr, phase);
469 expr = nft_expr_next(expr);
474 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
476 /* You cannot delete the same rule twice */
477 if (nft_is_active_next(ctx->net, rule)) {
478 nft_deactivate_next(ctx->net, rule);
485 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
486 struct nft_rule *rule)
488 struct nft_trans *trans;
490 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
494 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
495 nft_trans_rule_id(trans) =
496 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
498 nft_trans_rule(trans) = rule;
499 nft_trans_commit_list_add_tail(ctx->net, trans);
504 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
506 struct nft_flow_rule *flow;
507 struct nft_trans *trans;
510 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
514 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
515 flow = nft_flow_rule_create(ctx->net, rule);
517 nft_trans_destroy(trans);
518 return PTR_ERR(flow);
521 nft_trans_flow_rule(trans) = flow;
524 err = nf_tables_delrule_deactivate(ctx, rule);
526 nft_trans_destroy(trans);
529 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
534 static int nft_delrule_by_chain(struct nft_ctx *ctx)
536 struct nft_rule *rule;
539 list_for_each_entry(rule, &ctx->chain->rules, list) {
540 if (!nft_is_active_next(ctx->net, rule))
543 err = nft_delrule(ctx, rule);
550 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
552 const struct nft_set_desc *desc)
554 struct nft_trans *trans;
556 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
560 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
561 nft_trans_set_id(trans) =
562 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
563 nft_activate_next(ctx->net, set);
565 nft_trans_set(trans) = set;
567 nft_trans_set_update(trans) = true;
568 nft_trans_set_gc_int(trans) = desc->gc_int;
569 nft_trans_set_timeout(trans) = desc->timeout;
571 nft_trans_commit_list_add_tail(ctx->net, trans);
576 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
579 return __nft_trans_set_add(ctx, msg_type, set, NULL);
582 static void nft_setelem_data_deactivate(const struct net *net,
583 const struct nft_set *set,
584 struct nft_set_elem *elem);
586 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
588 const struct nft_set_iter *iter,
589 struct nft_set_elem *elem)
591 nft_setelem_data_deactivate(ctx->net, set, elem);
596 struct nft_set_elem_catchall {
597 struct list_head list;
602 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
605 u8 genmask = nft_genmask_next(ctx->net);
606 struct nft_set_elem_catchall *catchall;
607 struct nft_set_elem elem;
608 struct nft_set_ext *ext;
610 list_for_each_entry(catchall, &set->catchall_list, list) {
611 ext = nft_set_elem_ext(set, catchall->elem);
612 if (!nft_set_elem_active(ext, genmask))
615 elem.priv = catchall->elem;
616 nft_setelem_data_deactivate(ctx->net, set, &elem);
621 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
623 struct nft_set_iter iter = {
624 .genmask = nft_genmask_next(ctx->net),
625 .fn = nft_mapelem_deactivate,
628 set->ops->walk(ctx, set, &iter);
629 WARN_ON_ONCE(iter.err);
631 nft_map_catchall_deactivate(ctx, set);
634 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
638 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
642 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
643 nft_map_deactivate(ctx, set);
645 nft_deactivate_next(ctx->net, set);
651 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
652 struct nft_object *obj)
654 struct nft_trans *trans;
656 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
660 if (msg_type == NFT_MSG_NEWOBJ)
661 nft_activate_next(ctx->net, obj);
663 nft_trans_obj(trans) = obj;
664 nft_trans_commit_list_add_tail(ctx->net, trans);
669 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
673 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
677 nft_deactivate_next(ctx->net, obj);
683 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
684 struct nft_flowtable *flowtable)
686 struct nft_trans *trans;
688 trans = nft_trans_alloc(ctx, msg_type,
689 sizeof(struct nft_trans_flowtable));
693 if (msg_type == NFT_MSG_NEWFLOWTABLE)
694 nft_activate_next(ctx->net, flowtable);
696 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
697 nft_trans_flowtable(trans) = flowtable;
698 nft_trans_commit_list_add_tail(ctx->net, trans);
703 static int nft_delflowtable(struct nft_ctx *ctx,
704 struct nft_flowtable *flowtable)
708 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
712 nft_deactivate_next(ctx->net, flowtable);
718 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
722 for (i = track->regs[dreg].num_reg; i > 0; i--)
723 __nft_reg_track_cancel(track, dreg - i);
726 static void __nft_reg_track_update(struct nft_regs_track *track,
727 const struct nft_expr *expr,
730 track->regs[dreg].selector = expr;
731 track->regs[dreg].bitwise = NULL;
732 track->regs[dreg].num_reg = num_reg;
735 void nft_reg_track_update(struct nft_regs_track *track,
736 const struct nft_expr *expr, u8 dreg, u8 len)
738 unsigned int regcount;
741 __nft_reg_track_clobber(track, dreg);
743 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
744 for (i = 0; i < regcount; i++, dreg++)
745 __nft_reg_track_update(track, expr, dreg, i);
747 EXPORT_SYMBOL_GPL(nft_reg_track_update);
749 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
751 unsigned int regcount;
754 __nft_reg_track_clobber(track, dreg);
756 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
757 for (i = 0; i < regcount; i++, dreg++)
758 __nft_reg_track_cancel(track, dreg);
760 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
762 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
764 track->regs[dreg].selector = NULL;
765 track->regs[dreg].bitwise = NULL;
766 track->regs[dreg].num_reg = 0;
768 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
774 static struct nft_table *nft_table_lookup(const struct net *net,
775 const struct nlattr *nla,
776 u8 family, u8 genmask, u32 nlpid)
778 struct nftables_pernet *nft_net;
779 struct nft_table *table;
782 return ERR_PTR(-EINVAL);
784 nft_net = nft_pernet(net);
785 list_for_each_entry_rcu(table, &nft_net->tables, list,
786 lockdep_is_held(&nft_net->commit_mutex)) {
787 if (!nla_strcmp(nla, table->name) &&
788 table->family == family &&
789 nft_active_genmask(table, genmask)) {
790 if (nft_table_has_owner(table) &&
791 nlpid && table->nlpid != nlpid)
792 return ERR_PTR(-EPERM);
798 return ERR_PTR(-ENOENT);
801 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
802 const struct nlattr *nla,
803 u8 genmask, u32 nlpid)
805 struct nftables_pernet *nft_net;
806 struct nft_table *table;
808 nft_net = nft_pernet(net);
809 list_for_each_entry(table, &nft_net->tables, list) {
810 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
811 nft_active_genmask(table, genmask)) {
812 if (nft_table_has_owner(table) &&
813 nlpid && table->nlpid != nlpid)
814 return ERR_PTR(-EPERM);
820 return ERR_PTR(-ENOENT);
823 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
825 return ++table->hgenerator;
828 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
830 static const struct nft_chain_type *
831 __nft_chain_type_get(u8 family, enum nft_chain_types type)
833 if (family >= NFPROTO_NUMPROTO ||
834 type >= NFT_CHAIN_T_MAX)
837 return chain_type[family][type];
840 static const struct nft_chain_type *
841 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
843 const struct nft_chain_type *type;
846 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
847 type = __nft_chain_type_get(family, i);
850 if (!nla_strcmp(nla, type->name))
856 struct nft_module_request {
857 struct list_head list;
858 char module[MODULE_NAME_LEN];
862 #ifdef CONFIG_MODULES
863 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
866 char module_name[MODULE_NAME_LEN];
867 struct nftables_pernet *nft_net;
868 struct nft_module_request *req;
873 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
875 if (ret >= MODULE_NAME_LEN)
878 nft_net = nft_pernet(net);
879 list_for_each_entry(req, &nft_net->module_list, list) {
880 if (!strcmp(req->module, module_name)) {
884 /* A request to load this module already exists. */
889 req = kmalloc(sizeof(*req), GFP_KERNEL);
894 strscpy(req->module, module_name, MODULE_NAME_LEN);
895 list_add_tail(&req->list, &nft_net->module_list);
899 EXPORT_SYMBOL_GPL(nft_request_module);
902 static void lockdep_nfnl_nft_mutex_not_held(void)
904 #ifdef CONFIG_PROVE_LOCKING
906 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
910 static const struct nft_chain_type *
911 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
912 u8 family, bool autoload)
914 const struct nft_chain_type *type;
916 type = __nf_tables_chain_type_lookup(nla, family);
920 lockdep_nfnl_nft_mutex_not_held();
921 #ifdef CONFIG_MODULES
923 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
925 (const char *)nla_data(nla)) == -EAGAIN)
926 return ERR_PTR(-EAGAIN);
929 return ERR_PTR(-ENOENT);
932 static __be16 nft_base_seq(const struct net *net)
934 struct nftables_pernet *nft_net = nft_pernet(net);
936 return htons(nft_net->base_seq & 0xffff);
939 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
940 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
941 .len = NFT_TABLE_MAXNAMELEN - 1 },
942 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
943 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
944 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
945 .len = NFT_USERDATA_MAXLEN }
948 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
949 u32 portid, u32 seq, int event, u32 flags,
950 int family, const struct nft_table *table)
952 struct nlmsghdr *nlh;
954 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
955 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
956 NFNETLINK_V0, nft_base_seq(net));
958 goto nla_put_failure;
960 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
961 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
962 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
964 goto nla_put_failure;
966 if (event == NFT_MSG_DELTABLE) {
971 if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
972 htonl(table->flags & NFT_TABLE_F_MASK)))
973 goto nla_put_failure;
975 if (nft_table_has_owner(table) &&
976 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
977 goto nla_put_failure;
980 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
981 goto nla_put_failure;
988 nlmsg_trim(skb, nlh);
992 struct nftnl_skb_parms {
995 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
997 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
998 struct list_head *notify_list)
1000 NFT_CB(skb).report = report;
1001 list_add_tail(&skb->list, notify_list);
1004 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
1006 struct nftables_pernet *nft_net;
1007 struct sk_buff *skb;
1012 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1015 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1019 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1020 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1022 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
1023 event, flags, ctx->family, ctx->table);
1029 nft_net = nft_pernet(ctx->net);
1030 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1033 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1036 static int nf_tables_dump_tables(struct sk_buff *skb,
1037 struct netlink_callback *cb)
1039 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1040 struct nftables_pernet *nft_net;
1041 const struct nft_table *table;
1042 unsigned int idx = 0, s_idx = cb->args[0];
1043 struct net *net = sock_net(skb->sk);
1044 int family = nfmsg->nfgen_family;
1047 nft_net = nft_pernet(net);
1048 cb->seq = READ_ONCE(nft_net->base_seq);
1050 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1051 if (family != NFPROTO_UNSPEC && family != table->family)
1057 memset(&cb->args[1], 0,
1058 sizeof(cb->args) - sizeof(cb->args[0]));
1059 if (!nft_is_active(net, table))
1061 if (nf_tables_fill_table_info(skb, net,
1062 NETLINK_CB(cb->skb).portid,
1064 NFT_MSG_NEWTABLE, NLM_F_MULTI,
1065 table->family, table) < 0)
1068 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1078 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1079 const struct nlmsghdr *nlh,
1080 struct netlink_dump_control *c)
1084 if (!try_module_get(THIS_MODULE))
1088 err = netlink_dump_start(nlsk, skb, nlh, c);
1090 module_put(THIS_MODULE);
1095 /* called with rcu_read_lock held */
1096 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1097 const struct nlattr * const nla[])
1099 struct netlink_ext_ack *extack = info->extack;
1100 u8 genmask = nft_genmask_cur(info->net);
1101 u8 family = info->nfmsg->nfgen_family;
1102 const struct nft_table *table;
1103 struct net *net = info->net;
1104 struct sk_buff *skb2;
1107 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1108 struct netlink_dump_control c = {
1109 .dump = nf_tables_dump_tables,
1110 .module = THIS_MODULE,
1113 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1116 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1117 if (IS_ERR(table)) {
1118 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1119 return PTR_ERR(table);
1122 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1126 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1127 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1130 goto err_fill_table_info;
1132 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1134 err_fill_table_info:
1139 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1141 struct nft_chain *chain;
1144 list_for_each_entry(chain, &table->chains, list) {
1145 if (!nft_is_active_next(net, chain))
1147 if (!nft_is_base_chain(chain))
1150 if (cnt && i++ == cnt)
1153 nf_tables_unregister_hook(net, table, chain);
1157 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1159 struct nft_chain *chain;
1162 list_for_each_entry(chain, &table->chains, list) {
1163 if (!nft_is_active_next(net, chain))
1165 if (!nft_is_base_chain(chain))
1168 err = nf_tables_register_hook(net, table, chain);
1170 goto err_register_hooks;
1178 nft_table_disable(net, table, i);
1182 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1184 table->flags &= ~NFT_TABLE_F_DORMANT;
1185 nft_table_disable(net, table, 0);
1186 table->flags |= NFT_TABLE_F_DORMANT;
1189 #define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
1190 #define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
1191 #define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
1192 #define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
1193 __NFT_TABLE_F_WAS_AWAKEN)
1195 static int nf_tables_updtable(struct nft_ctx *ctx)
1197 struct nft_trans *trans;
1201 if (!ctx->nla[NFTA_TABLE_FLAGS])
1204 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1205 if (flags & ~NFT_TABLE_F_MASK)
1208 if (flags == ctx->table->flags)
1211 if ((nft_table_has_owner(ctx->table) &&
1212 !(flags & NFT_TABLE_F_OWNER)) ||
1213 (!nft_table_has_owner(ctx->table) &&
1214 flags & NFT_TABLE_F_OWNER))
1217 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1218 sizeof(struct nft_trans_table));
1222 if ((flags & NFT_TABLE_F_DORMANT) &&
1223 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1224 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1225 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1226 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1227 } else 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 ret = nf_tables_table_enable(ctx->net, ctx->table);
1233 goto err_register_hooks;
1235 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1239 nft_trans_table_update(trans) = true;
1240 nft_trans_commit_list_add_tail(ctx->net, trans);
1245 nft_trans_destroy(trans);
1249 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1251 const char *name = data;
1253 return jhash(name, strlen(name), seed);
1256 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1258 const struct nft_chain *chain = data;
1260 return nft_chain_hash(chain->name, 0, seed);
1263 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1266 const struct nft_chain *chain = ptr;
1267 const char *name = arg->key;
1269 return strcmp(chain->name, name);
1272 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1274 const struct nft_object_hash_key *k = data;
1276 seed ^= hash_ptr(k->table, 32);
1278 return jhash(k->name, strlen(k->name), seed);
1281 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1283 const struct nft_object *obj = data;
1285 return nft_objname_hash(&obj->key, 0, seed);
1288 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1291 const struct nft_object_hash_key *k = arg->key;
1292 const struct nft_object *obj = ptr;
1294 if (obj->key.table != k->table)
1297 return strcmp(obj->key.name, k->name);
1300 static bool nft_supported_family(u8 family)
1303 #ifdef CONFIG_NF_TABLES_INET
1304 || family == NFPROTO_INET
1306 #ifdef CONFIG_NF_TABLES_IPV4
1307 || family == NFPROTO_IPV4
1309 #ifdef CONFIG_NF_TABLES_ARP
1310 || family == NFPROTO_ARP
1312 #ifdef CONFIG_NF_TABLES_NETDEV
1313 || family == NFPROTO_NETDEV
1315 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1316 || family == NFPROTO_BRIDGE
1318 #ifdef CONFIG_NF_TABLES_IPV6
1319 || family == NFPROTO_IPV6
1324 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1325 const struct nlattr * const nla[])
1327 struct nftables_pernet *nft_net = nft_pernet(info->net);
1328 struct netlink_ext_ack *extack = info->extack;
1329 u8 genmask = nft_genmask_next(info->net);
1330 u8 family = info->nfmsg->nfgen_family;
1331 struct net *net = info->net;
1332 const struct nlattr *attr;
1333 struct nft_table *table;
1338 if (!nft_supported_family(family))
1341 lockdep_assert_held(&nft_net->commit_mutex);
1342 attr = nla[NFTA_TABLE_NAME];
1343 table = nft_table_lookup(net, attr, family, genmask,
1344 NETLINK_CB(skb).portid);
1345 if (IS_ERR(table)) {
1346 if (PTR_ERR(table) != -ENOENT)
1347 return PTR_ERR(table);
1349 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1350 NL_SET_BAD_ATTR(extack, attr);
1353 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1356 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1358 return nf_tables_updtable(&ctx);
1361 if (nla[NFTA_TABLE_FLAGS]) {
1362 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1363 if (flags & ~NFT_TABLE_F_MASK)
1368 table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1372 table->validate_state = NFT_VALIDATE_SKIP;
1373 table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1374 if (table->name == NULL)
1377 if (nla[NFTA_TABLE_USERDATA]) {
1378 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1379 if (table->udata == NULL)
1380 goto err_table_udata;
1382 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1385 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1389 INIT_LIST_HEAD(&table->chains);
1390 INIT_LIST_HEAD(&table->sets);
1391 INIT_LIST_HEAD(&table->objects);
1392 INIT_LIST_HEAD(&table->flowtables);
1393 table->family = family;
1394 table->flags = flags;
1395 table->handle = ++nft_net->table_handle;
1396 if (table->flags & NFT_TABLE_F_OWNER)
1397 table->nlpid = NETLINK_CB(skb).portid;
1399 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1400 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1404 list_add_tail_rcu(&table->list, &nft_net->tables);
1407 rhltable_destroy(&table->chains_ht);
1409 kfree(table->udata);
1418 static int nft_flush_table(struct nft_ctx *ctx)
1420 struct nft_flowtable *flowtable, *nft;
1421 struct nft_chain *chain, *nc;
1422 struct nft_object *obj, *ne;
1423 struct nft_set *set, *ns;
1426 list_for_each_entry(chain, &ctx->table->chains, list) {
1427 if (!nft_is_active_next(ctx->net, chain))
1430 if (nft_chain_is_bound(chain))
1435 err = nft_delrule_by_chain(ctx);
1440 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1441 if (!nft_is_active_next(ctx->net, set))
1444 if (nft_set_is_anonymous(set) &&
1445 !list_empty(&set->bindings))
1448 err = nft_delset(ctx, set);
1453 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1454 if (!nft_is_active_next(ctx->net, flowtable))
1457 err = nft_delflowtable(ctx, flowtable);
1462 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1463 if (!nft_is_active_next(ctx->net, obj))
1466 err = nft_delobj(ctx, obj);
1471 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1472 if (!nft_is_active_next(ctx->net, chain))
1475 if (nft_chain_is_bound(chain))
1480 err = nft_delchain(ctx);
1485 err = nft_deltable(ctx);
1490 static int nft_flush(struct nft_ctx *ctx, int family)
1492 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1493 const struct nlattr * const *nla = ctx->nla;
1494 struct nft_table *table, *nt;
1497 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1498 if (family != AF_UNSPEC && table->family != family)
1501 ctx->family = table->family;
1503 if (!nft_is_active_next(ctx->net, table))
1506 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1509 if (nla[NFTA_TABLE_NAME] &&
1510 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1515 err = nft_flush_table(ctx);
1523 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1524 const struct nlattr * const nla[])
1526 struct netlink_ext_ack *extack = info->extack;
1527 u8 genmask = nft_genmask_next(info->net);
1528 u8 family = info->nfmsg->nfgen_family;
1529 struct net *net = info->net;
1530 const struct nlattr *attr;
1531 struct nft_table *table;
1534 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1535 if (family == AF_UNSPEC ||
1536 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1537 return nft_flush(&ctx, family);
1539 if (nla[NFTA_TABLE_HANDLE]) {
1540 attr = nla[NFTA_TABLE_HANDLE];
1541 table = nft_table_lookup_byhandle(net, attr, genmask,
1542 NETLINK_CB(skb).portid);
1544 attr = nla[NFTA_TABLE_NAME];
1545 table = nft_table_lookup(net, attr, family, genmask,
1546 NETLINK_CB(skb).portid);
1549 if (IS_ERR(table)) {
1550 if (PTR_ERR(table) == -ENOENT &&
1551 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1554 NL_SET_BAD_ATTR(extack, attr);
1555 return PTR_ERR(table);
1558 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1562 ctx.family = family;
1565 return nft_flush_table(&ctx);
1568 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1570 if (WARN_ON(ctx->table->use > 0))
1573 rhltable_destroy(&ctx->table->chains_ht);
1574 kfree(ctx->table->name);
1575 kfree(ctx->table->udata);
1579 void nft_register_chain_type(const struct nft_chain_type *ctype)
1581 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1582 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1583 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1586 chain_type[ctype->family][ctype->type] = ctype;
1587 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1589 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1591 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1593 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1594 chain_type[ctype->family][ctype->type] = NULL;
1595 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1597 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1603 static struct nft_chain *
1604 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1606 struct nft_chain *chain;
1608 list_for_each_entry(chain, &table->chains, list) {
1609 if (chain->handle == handle &&
1610 nft_active_genmask(chain, genmask))
1614 return ERR_PTR(-ENOENT);
1617 static bool lockdep_commit_lock_is_held(const struct net *net)
1619 #ifdef CONFIG_PROVE_LOCKING
1620 struct nftables_pernet *nft_net = nft_pernet(net);
1622 return lockdep_is_held(&nft_net->commit_mutex);
1628 static struct nft_chain *nft_chain_lookup(struct net *net,
1629 struct nft_table *table,
1630 const struct nlattr *nla, u8 genmask)
1632 char search[NFT_CHAIN_MAXNAMELEN + 1];
1633 struct rhlist_head *tmp, *list;
1634 struct nft_chain *chain;
1637 return ERR_PTR(-EINVAL);
1639 nla_strscpy(search, nla, sizeof(search));
1641 WARN_ON(!rcu_read_lock_held() &&
1642 !lockdep_commit_lock_is_held(net));
1644 chain = ERR_PTR(-ENOENT);
1646 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1650 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1651 if (nft_active_genmask(chain, genmask))
1654 chain = ERR_PTR(-ENOENT);
1660 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1661 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1662 .len = NFT_TABLE_MAXNAMELEN - 1 },
1663 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1664 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1665 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1666 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1667 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1668 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1669 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1670 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1671 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1672 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1673 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1674 .len = NFT_USERDATA_MAXLEN },
1677 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1678 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1679 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1680 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1681 .len = IFNAMSIZ - 1 },
1684 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1686 struct nft_stats *cpu_stats, total;
1687 struct nlattr *nest;
1695 memset(&total, 0, sizeof(total));
1696 for_each_possible_cpu(cpu) {
1697 cpu_stats = per_cpu_ptr(stats, cpu);
1699 seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1700 pkts = cpu_stats->pkts;
1701 bytes = cpu_stats->bytes;
1702 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1704 total.bytes += bytes;
1706 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1708 goto nla_put_failure;
1710 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1711 NFTA_COUNTER_PAD) ||
1712 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1714 goto nla_put_failure;
1716 nla_nest_end(skb, nest);
1723 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1724 const struct nft_base_chain *basechain,
1725 const struct list_head *hook_list)
1727 const struct nf_hook_ops *ops = &basechain->ops;
1728 struct nft_hook *hook, *first = NULL;
1729 struct nlattr *nest, *nest_devs;
1732 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1734 goto nla_put_failure;
1735 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1736 goto nla_put_failure;
1737 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1738 goto nla_put_failure;
1740 if (nft_base_chain_netdev(family, ops->hooknum)) {
1741 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1743 goto nla_put_failure;
1746 hook_list = &basechain->hook_list;
1748 list_for_each_entry(hook, hook_list, list) {
1752 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1753 hook->ops.dev->name))
1754 goto nla_put_failure;
1757 nla_nest_end(skb, nest_devs);
1760 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1761 goto nla_put_failure;
1763 nla_nest_end(skb, nest);
1770 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1771 u32 portid, u32 seq, int event, u32 flags,
1772 int family, const struct nft_table *table,
1773 const struct nft_chain *chain,
1774 const struct list_head *hook_list)
1776 struct nlmsghdr *nlh;
1778 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1779 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1780 NFNETLINK_V0, nft_base_seq(net));
1782 goto nla_put_failure;
1784 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1785 nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1786 nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1788 goto nla_put_failure;
1790 if (event == NFT_MSG_DELCHAIN && !hook_list) {
1791 nlmsg_end(skb, nlh);
1795 if (nft_is_base_chain(chain)) {
1796 const struct nft_base_chain *basechain = nft_base_chain(chain);
1797 struct nft_stats __percpu *stats;
1799 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1800 goto nla_put_failure;
1802 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1803 htonl(basechain->policy)))
1804 goto nla_put_failure;
1806 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1807 goto nla_put_failure;
1809 stats = rcu_dereference_check(basechain->stats,
1810 lockdep_commit_lock_is_held(net));
1811 if (nft_dump_stats(skb, stats))
1812 goto nla_put_failure;
1816 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1817 goto nla_put_failure;
1819 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1820 goto nla_put_failure;
1823 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1824 goto nla_put_failure;
1826 nlmsg_end(skb, nlh);
1830 nlmsg_trim(skb, nlh);
1834 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1835 const struct list_head *hook_list)
1837 struct nftables_pernet *nft_net;
1838 struct sk_buff *skb;
1843 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1846 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1850 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1851 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1853 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1854 event, flags, ctx->family, ctx->table,
1855 ctx->chain, hook_list);
1861 nft_net = nft_pernet(ctx->net);
1862 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1865 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1868 static int nf_tables_dump_chains(struct sk_buff *skb,
1869 struct netlink_callback *cb)
1871 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1872 unsigned int idx = 0, s_idx = cb->args[0];
1873 struct net *net = sock_net(skb->sk);
1874 int family = nfmsg->nfgen_family;
1875 struct nftables_pernet *nft_net;
1876 const struct nft_table *table;
1877 const struct nft_chain *chain;
1880 nft_net = nft_pernet(net);
1881 cb->seq = READ_ONCE(nft_net->base_seq);
1883 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1884 if (family != NFPROTO_UNSPEC && family != table->family)
1887 list_for_each_entry_rcu(chain, &table->chains, list) {
1891 memset(&cb->args[1], 0,
1892 sizeof(cb->args) - sizeof(cb->args[0]));
1893 if (!nft_is_active(net, chain))
1895 if (nf_tables_fill_chain_info(skb, net,
1896 NETLINK_CB(cb->skb).portid,
1900 table->family, table,
1904 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1915 /* called with rcu_read_lock held */
1916 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1917 const struct nlattr * const nla[])
1919 struct netlink_ext_ack *extack = info->extack;
1920 u8 genmask = nft_genmask_cur(info->net);
1921 u8 family = info->nfmsg->nfgen_family;
1922 const struct nft_chain *chain;
1923 struct net *net = info->net;
1924 struct nft_table *table;
1925 struct sk_buff *skb2;
1928 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1929 struct netlink_dump_control c = {
1930 .dump = nf_tables_dump_chains,
1931 .module = THIS_MODULE,
1934 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1937 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1938 if (IS_ERR(table)) {
1939 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1940 return PTR_ERR(table);
1943 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1944 if (IS_ERR(chain)) {
1945 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1946 return PTR_ERR(chain);
1949 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1953 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1954 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1955 0, family, table, chain, NULL);
1957 goto err_fill_chain_info;
1959 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1961 err_fill_chain_info:
1966 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1967 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1968 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1971 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1973 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1974 struct nft_stats __percpu *newstats;
1975 struct nft_stats *stats;
1978 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1979 nft_counter_policy, NULL);
1981 return ERR_PTR(err);
1983 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1984 return ERR_PTR(-EINVAL);
1986 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1987 if (newstats == NULL)
1988 return ERR_PTR(-ENOMEM);
1990 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1991 * are not exposed to userspace.
1994 stats = this_cpu_ptr(newstats);
1995 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1996 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
2002 static void nft_chain_stats_replace(struct nft_trans *trans)
2004 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
2006 if (!nft_trans_chain_stats(trans))
2009 nft_trans_chain_stats(trans) =
2010 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
2011 lockdep_commit_lock_is_held(trans->ctx.net));
2013 if (!nft_trans_chain_stats(trans))
2014 static_branch_inc(&nft_counters_enabled);
2017 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
2019 struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
2020 struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
2026 /* should be NULL either via abort or via successful commit */
2027 WARN_ON_ONCE(chain->blob_next);
2028 kvfree(chain->blob_next);
2031 void nf_tables_chain_destroy(struct nft_ctx *ctx)
2033 struct nft_chain *chain = ctx->chain;
2034 struct nft_hook *hook, *next;
2036 if (WARN_ON(chain->use > 0))
2039 /* no concurrent access possible anymore */
2040 nf_tables_chain_free_chain_rules(chain);
2042 if (nft_is_base_chain(chain)) {
2043 struct nft_base_chain *basechain = nft_base_chain(chain);
2045 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2046 list_for_each_entry_safe(hook, next,
2047 &basechain->hook_list, list) {
2048 list_del_rcu(&hook->list);
2049 kfree_rcu(hook, rcu);
2052 module_put(basechain->type->owner);
2053 if (rcu_access_pointer(basechain->stats)) {
2054 static_branch_dec(&nft_counters_enabled);
2055 free_percpu(rcu_dereference_raw(basechain->stats));
2058 kfree(chain->udata);
2062 kfree(chain->udata);
2067 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2068 const struct nlattr *attr)
2070 struct net_device *dev;
2071 char ifname[IFNAMSIZ];
2072 struct nft_hook *hook;
2075 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2078 goto err_hook_alloc;
2081 nla_strscpy(ifname, attr, IFNAMSIZ);
2082 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2083 * indirectly serializing all the other holders of the commit_mutex with
2086 dev = __dev_get_by_name(net, ifname);
2091 hook->ops.dev = dev;
2098 return ERR_PTR(err);
2101 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2102 const struct nft_hook *this)
2104 struct nft_hook *hook;
2106 list_for_each_entry(hook, hook_list, list) {
2107 if (this->ops.dev == hook->ops.dev)
2114 static int nf_tables_parse_netdev_hooks(struct net *net,
2115 const struct nlattr *attr,
2116 struct list_head *hook_list,
2117 struct netlink_ext_ack *extack)
2119 struct nft_hook *hook, *next;
2120 const struct nlattr *tmp;
2121 int rem, n = 0, err;
2123 nla_for_each_nested(tmp, attr, rem) {
2124 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2129 hook = nft_netdev_hook_alloc(net, tmp);
2131 NL_SET_BAD_ATTR(extack, tmp);
2132 err = PTR_ERR(hook);
2135 if (nft_hook_list_find(hook_list, hook)) {
2136 NL_SET_BAD_ATTR(extack, tmp);
2141 list_add_tail(&hook->list, hook_list);
2144 if (n == NFT_NETDEVICE_MAX) {
2153 list_for_each_entry_safe(hook, next, hook_list, list) {
2154 list_del(&hook->list);
2160 struct nft_chain_hook {
2163 const struct nft_chain_type *type;
2164 struct list_head list;
2167 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2168 struct list_head *hook_list,
2169 struct netlink_ext_ack *extack, u32 flags)
2171 struct nft_hook *hook;
2174 if (tb[NFTA_HOOK_DEV]) {
2175 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2177 NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2178 return PTR_ERR(hook);
2181 list_add_tail(&hook->list, hook_list);
2182 } else if (tb[NFTA_HOOK_DEVS]) {
2183 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2190 if (flags & NFT_CHAIN_HW_OFFLOAD &&
2191 list_empty(hook_list))
2197 static int nft_chain_parse_hook(struct net *net,
2198 struct nft_base_chain *basechain,
2199 const struct nlattr * const nla[],
2200 struct nft_chain_hook *hook, u8 family,
2201 u32 flags, struct netlink_ext_ack *extack)
2203 struct nftables_pernet *nft_net = nft_pernet(net);
2204 struct nlattr *ha[NFTA_HOOK_MAX + 1];
2205 const struct nft_chain_type *type;
2208 lockdep_assert_held(&nft_net->commit_mutex);
2209 lockdep_nfnl_nft_mutex_not_held();
2211 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2212 nla[NFTA_CHAIN_HOOK],
2213 nft_hook_policy, NULL);
2218 if (!ha[NFTA_HOOK_HOOKNUM] ||
2219 !ha[NFTA_HOOK_PRIORITY]) {
2220 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2224 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2225 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2227 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2231 if (nla[NFTA_CHAIN_TYPE]) {
2232 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2235 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2236 return PTR_ERR(type);
2239 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2242 if (type->type == NFT_CHAIN_T_NAT &&
2243 hook->priority <= NF_IP_PRI_CONNTRACK)
2246 if (ha[NFTA_HOOK_HOOKNUM]) {
2247 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2248 if (hook->num != basechain->ops.hooknum)
2251 if (ha[NFTA_HOOK_PRIORITY]) {
2252 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2253 if (hook->priority != basechain->ops.priority)
2257 type = basechain->type;
2260 if (!try_module_get(type->owner)) {
2261 if (nla[NFTA_CHAIN_TYPE])
2262 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2268 INIT_LIST_HEAD(&hook->list);
2269 if (nft_base_chain_netdev(family, hook->num)) {
2270 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2272 module_put(type->owner);
2275 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2276 module_put(type->owner);
2283 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2285 struct nft_hook *h, *next;
2287 list_for_each_entry_safe(h, next, &hook->list, list) {
2291 module_put(hook->type->owner);
2294 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2296 struct nft_rule_dp_last *lrule;
2298 BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2300 lrule = (struct nft_rule_dp_last *)ptr;
2301 lrule->end.is_last = 1;
2302 lrule->chain = chain;
2303 /* blob size does not include the trailer rule */
2306 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2309 struct nft_rule_blob *blob;
2314 size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2316 blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2321 nft_last_rule(chain, blob->data);
2326 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2327 const struct nft_chain_hook *hook,
2328 struct nft_chain *chain)
2331 ops->hooknum = hook->num;
2332 ops->priority = hook->priority;
2334 ops->hook = hook->type->hooks[ops->hooknum];
2335 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
2338 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2339 struct nft_chain_hook *hook, u32 flags)
2341 struct nft_chain *chain;
2344 basechain->type = hook->type;
2345 INIT_LIST_HEAD(&basechain->hook_list);
2346 chain = &basechain->chain;
2348 if (nft_base_chain_netdev(family, hook->num)) {
2349 list_splice_init(&hook->list, &basechain->hook_list);
2350 list_for_each_entry(h, &basechain->hook_list, list)
2351 nft_basechain_hook_init(&h->ops, family, hook, chain);
2353 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2355 chain->flags |= NFT_CHAIN_BASE | flags;
2356 basechain->policy = NF_ACCEPT;
2357 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2358 !nft_chain_offload_support(basechain)) {
2359 list_splice_init(&basechain->hook_list, &hook->list);
2363 flow_block_init(&basechain->flow_block);
2368 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2372 err = rhltable_insert_key(&table->chains_ht, chain->name,
2373 &chain->rhlhead, nft_chain_ht_params);
2377 list_add_tail_rcu(&chain->list, &table->chains);
2382 static u64 chain_id;
2384 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2385 u8 policy, u32 flags,
2386 struct netlink_ext_ack *extack)
2388 const struct nlattr * const *nla = ctx->nla;
2389 struct nft_table *table = ctx->table;
2390 struct nft_base_chain *basechain;
2391 struct net *net = ctx->net;
2392 char name[NFT_NAME_MAXLEN];
2393 struct nft_rule_blob *blob;
2394 struct nft_trans *trans;
2395 struct nft_chain *chain;
2398 if (table->use == UINT_MAX)
2401 if (nla[NFTA_CHAIN_HOOK]) {
2402 struct nft_stats __percpu *stats = NULL;
2403 struct nft_chain_hook hook = {};
2405 if (flags & NFT_CHAIN_BINDING)
2408 err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2413 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2414 if (basechain == NULL) {
2415 nft_chain_release_hook(&hook);
2418 chain = &basechain->chain;
2420 if (nla[NFTA_CHAIN_COUNTERS]) {
2421 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2422 if (IS_ERR(stats)) {
2423 nft_chain_release_hook(&hook);
2425 return PTR_ERR(stats);
2427 rcu_assign_pointer(basechain->stats, stats);
2430 err = nft_basechain_init(basechain, family, &hook, flags);
2432 nft_chain_release_hook(&hook);
2438 static_branch_inc(&nft_counters_enabled);
2440 if (flags & NFT_CHAIN_BASE)
2442 if (flags & NFT_CHAIN_HW_OFFLOAD)
2445 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2449 chain->flags = flags;
2453 INIT_LIST_HEAD(&chain->rules);
2454 chain->handle = nf_tables_alloc_handle(table);
2455 chain->table = table;
2457 if (nla[NFTA_CHAIN_NAME]) {
2458 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2460 if (!(flags & NFT_CHAIN_BINDING)) {
2462 goto err_destroy_chain;
2465 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2466 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2471 goto err_destroy_chain;
2474 if (nla[NFTA_CHAIN_USERDATA]) {
2475 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2476 if (chain->udata == NULL) {
2478 goto err_destroy_chain;
2480 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2483 blob = nf_tables_chain_alloc_rules(chain, 0);
2486 goto err_destroy_chain;
2489 RCU_INIT_POINTER(chain->blob_gen_0, blob);
2490 RCU_INIT_POINTER(chain->blob_gen_1, blob);
2492 err = nf_tables_register_hook(net, table, chain);
2494 goto err_destroy_chain;
2496 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2497 if (IS_ERR(trans)) {
2498 err = PTR_ERR(trans);
2499 goto err_unregister_hook;
2502 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2503 if (nft_is_base_chain(chain))
2504 nft_trans_chain_policy(trans) = policy;
2506 err = nft_chain_add(table, chain);
2508 nft_trans_destroy(trans);
2509 goto err_unregister_hook;
2515 err_unregister_hook:
2516 nf_tables_unregister_hook(net, table, chain);
2518 nf_tables_chain_destroy(ctx);
2523 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2524 u32 flags, const struct nlattr *attr,
2525 struct netlink_ext_ack *extack)
2527 const struct nlattr * const *nla = ctx->nla;
2528 struct nft_base_chain *basechain = NULL;
2529 struct nft_table *table = ctx->table;
2530 struct nft_chain *chain = ctx->chain;
2531 struct nft_chain_hook hook = {};
2532 struct nft_stats *stats = NULL;
2533 struct nft_hook *h, *next;
2534 struct nf_hook_ops *ops;
2535 struct nft_trans *trans;
2536 bool unregister = false;
2539 if (chain->flags ^ flags)
2542 INIT_LIST_HEAD(&hook.list);
2544 if (nla[NFTA_CHAIN_HOOK]) {
2545 if (!nft_is_base_chain(chain)) {
2546 NL_SET_BAD_ATTR(extack, attr);
2550 basechain = nft_base_chain(chain);
2551 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2552 ctx->family, flags, extack);
2556 if (basechain->type != hook.type) {
2557 nft_chain_release_hook(&hook);
2558 NL_SET_BAD_ATTR(extack, attr);
2562 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2563 list_for_each_entry_safe(h, next, &hook.list, list) {
2564 h->ops.pf = basechain->ops.pf;
2565 h->ops.hooknum = basechain->ops.hooknum;
2566 h->ops.priority = basechain->ops.priority;
2567 h->ops.priv = basechain->ops.priv;
2568 h->ops.hook = basechain->ops.hook;
2570 if (nft_hook_list_find(&basechain->hook_list, h)) {
2576 ops = &basechain->ops;
2577 if (ops->hooknum != hook.num ||
2578 ops->priority != hook.priority) {
2579 nft_chain_release_hook(&hook);
2580 NL_SET_BAD_ATTR(extack, attr);
2586 if (nla[NFTA_CHAIN_HANDLE] &&
2587 nla[NFTA_CHAIN_NAME]) {
2588 struct nft_chain *chain2;
2590 chain2 = nft_chain_lookup(ctx->net, table,
2591 nla[NFTA_CHAIN_NAME], genmask);
2592 if (!IS_ERR(chain2)) {
2593 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2599 if (nla[NFTA_CHAIN_COUNTERS]) {
2600 if (!nft_is_base_chain(chain)) {
2605 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2606 if (IS_ERR(stats)) {
2607 err = PTR_ERR(stats);
2612 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2613 nft_is_base_chain(chain) &&
2614 !list_empty(&hook.list)) {
2615 basechain = nft_base_chain(chain);
2616 ops = &basechain->ops;
2618 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2619 err = nft_netdev_register_hooks(ctx->net, &hook.list);
2627 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2628 sizeof(struct nft_trans_chain));
2632 nft_trans_chain_stats(trans) = stats;
2633 nft_trans_chain_update(trans) = true;
2635 if (nla[NFTA_CHAIN_POLICY])
2636 nft_trans_chain_policy(trans) = policy;
2638 nft_trans_chain_policy(trans) = -1;
2640 if (nla[NFTA_CHAIN_HANDLE] &&
2641 nla[NFTA_CHAIN_NAME]) {
2642 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2643 struct nft_trans *tmp;
2647 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2652 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2653 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2654 tmp->ctx.table == table &&
2655 nft_trans_chain_update(tmp) &&
2656 nft_trans_chain_name(tmp) &&
2657 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2658 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2664 nft_trans_chain_name(trans) = name;
2667 nft_trans_basechain(trans) = basechain;
2668 INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2669 list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2670 if (nla[NFTA_CHAIN_HOOK])
2671 module_put(hook.type->owner);
2673 nft_trans_commit_list_add_tail(ctx->net, trans);
2681 if (nla[NFTA_CHAIN_HOOK]) {
2682 list_for_each_entry_safe(h, next, &hook.list, list) {
2684 nf_unregister_net_hook(ctx->net, &h->ops);
2688 module_put(hook.type->owner);
2694 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2695 const struct nft_table *table,
2696 const struct nlattr *nla)
2698 struct nftables_pernet *nft_net = nft_pernet(net);
2699 u32 id = ntohl(nla_get_be32(nla));
2700 struct nft_trans *trans;
2702 list_for_each_entry(trans, &nft_net->commit_list, list) {
2703 struct nft_chain *chain = trans->ctx.chain;
2705 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2706 chain->table == table &&
2707 id == nft_trans_chain_id(trans))
2710 return ERR_PTR(-ENOENT);
2713 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2714 const struct nlattr * const nla[])
2716 struct nftables_pernet *nft_net = nft_pernet(info->net);
2717 struct netlink_ext_ack *extack = info->extack;
2718 u8 genmask = nft_genmask_next(info->net);
2719 u8 family = info->nfmsg->nfgen_family;
2720 struct nft_chain *chain = NULL;
2721 struct net *net = info->net;
2722 const struct nlattr *attr;
2723 struct nft_table *table;
2724 u8 policy = NF_ACCEPT;
2729 lockdep_assert_held(&nft_net->commit_mutex);
2731 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2732 NETLINK_CB(skb).portid);
2733 if (IS_ERR(table)) {
2734 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2735 return PTR_ERR(table);
2739 attr = nla[NFTA_CHAIN_NAME];
2741 if (nla[NFTA_CHAIN_HANDLE]) {
2742 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2743 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2744 if (IS_ERR(chain)) {
2745 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2746 return PTR_ERR(chain);
2748 attr = nla[NFTA_CHAIN_HANDLE];
2749 } else if (nla[NFTA_CHAIN_NAME]) {
2750 chain = nft_chain_lookup(net, table, attr, genmask);
2751 if (IS_ERR(chain)) {
2752 if (PTR_ERR(chain) != -ENOENT) {
2753 NL_SET_BAD_ATTR(extack, attr);
2754 return PTR_ERR(chain);
2758 } else if (!nla[NFTA_CHAIN_ID]) {
2762 if (nla[NFTA_CHAIN_POLICY]) {
2763 if (chain != NULL &&
2764 !nft_is_base_chain(chain)) {
2765 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2769 if (chain == NULL &&
2770 nla[NFTA_CHAIN_HOOK] == NULL) {
2771 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2775 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2785 if (nla[NFTA_CHAIN_FLAGS])
2786 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2788 flags = chain->flags;
2790 if (flags & ~NFT_CHAIN_FLAGS)
2793 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2795 if (chain != NULL) {
2796 if (chain->flags & NFT_CHAIN_BINDING)
2799 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2800 NL_SET_BAD_ATTR(extack, attr);
2803 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2806 flags |= chain->flags & NFT_CHAIN_BASE;
2807 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2811 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2814 static int nft_delchain_hook(struct nft_ctx *ctx,
2815 struct nft_base_chain *basechain,
2816 struct netlink_ext_ack *extack)
2818 const struct nft_chain *chain = &basechain->chain;
2819 const struct nlattr * const *nla = ctx->nla;
2820 struct nft_chain_hook chain_hook = {};
2821 struct nft_hook *this, *hook;
2822 LIST_HEAD(chain_del_list);
2823 struct nft_trans *trans;
2826 err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2827 ctx->family, chain->flags, extack);
2831 list_for_each_entry(this, &chain_hook.list, list) {
2832 hook = nft_hook_list_find(&basechain->hook_list, this);
2835 goto err_chain_del_hook;
2837 list_move(&hook->list, &chain_del_list);
2840 trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2841 sizeof(struct nft_trans_chain));
2844 goto err_chain_del_hook;
2847 nft_trans_basechain(trans) = basechain;
2848 nft_trans_chain_update(trans) = true;
2849 INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2850 list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2851 nft_chain_release_hook(&chain_hook);
2853 nft_trans_commit_list_add_tail(ctx->net, trans);
2858 list_splice(&chain_del_list, &basechain->hook_list);
2859 nft_chain_release_hook(&chain_hook);
2864 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2865 const struct nlattr * const nla[])
2867 struct netlink_ext_ack *extack = info->extack;
2868 u8 genmask = nft_genmask_next(info->net);
2869 u8 family = info->nfmsg->nfgen_family;
2870 struct net *net = info->net;
2871 const struct nlattr *attr;
2872 struct nft_table *table;
2873 struct nft_chain *chain;
2874 struct nft_rule *rule;
2880 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2881 NETLINK_CB(skb).portid);
2882 if (IS_ERR(table)) {
2883 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2884 return PTR_ERR(table);
2887 if (nla[NFTA_CHAIN_HANDLE]) {
2888 attr = nla[NFTA_CHAIN_HANDLE];
2889 handle = be64_to_cpu(nla_get_be64(attr));
2890 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2892 attr = nla[NFTA_CHAIN_NAME];
2893 chain = nft_chain_lookup(net, table, attr, genmask);
2895 if (IS_ERR(chain)) {
2896 if (PTR_ERR(chain) == -ENOENT &&
2897 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2900 NL_SET_BAD_ATTR(extack, attr);
2901 return PTR_ERR(chain);
2904 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2906 if (nla[NFTA_CHAIN_HOOK]) {
2907 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2910 if (nft_is_base_chain(chain)) {
2911 struct nft_base_chain *basechain = nft_base_chain(chain);
2913 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2914 return nft_delchain_hook(&ctx, basechain, extack);
2918 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2923 list_for_each_entry(rule, &chain->rules, list) {
2924 if (!nft_is_active_next(net, rule))
2928 err = nft_delrule(&ctx, rule);
2933 /* There are rules and elements that are still holding references to us,
2934 * we cannot do a recursive removal in this case.
2937 NL_SET_BAD_ATTR(extack, attr);
2941 return nft_delchain(&ctx);
2949 * nft_register_expr - register nf_tables expr type
2952 * Registers the expr type for use with nf_tables. Returns zero on
2953 * success or a negative errno code otherwise.
2955 int nft_register_expr(struct nft_expr_type *type)
2957 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2958 if (type->family == NFPROTO_UNSPEC)
2959 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2961 list_add_rcu(&type->list, &nf_tables_expressions);
2962 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2965 EXPORT_SYMBOL_GPL(nft_register_expr);
2968 * nft_unregister_expr - unregister nf_tables expr type
2971 * Unregisters the expr typefor use with nf_tables.
2973 void nft_unregister_expr(struct nft_expr_type *type)
2975 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2976 list_del_rcu(&type->list);
2977 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2979 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2981 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2984 const struct nft_expr_type *type, *candidate = NULL;
2986 list_for_each_entry(type, &nf_tables_expressions, list) {
2987 if (!nla_strcmp(nla, type->name)) {
2988 if (!type->family && !candidate)
2990 else if (type->family == family)
2997 #ifdef CONFIG_MODULES
2998 static int nft_expr_type_request_module(struct net *net, u8 family,
3001 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3002 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3009 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3013 const struct nft_expr_type *type;
3016 return ERR_PTR(-EINVAL);
3018 type = __nft_expr_type_get(family, nla);
3019 if (type != NULL && try_module_get(type->owner))
3022 lockdep_nfnl_nft_mutex_not_held();
3023 #ifdef CONFIG_MODULES
3025 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3026 return ERR_PTR(-EAGAIN);
3028 if (nft_request_module(net, "nft-expr-%.*s",
3030 (char *)nla_data(nla)) == -EAGAIN)
3031 return ERR_PTR(-EAGAIN);
3034 return ERR_PTR(-ENOENT);
3037 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3038 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
3039 .len = NFT_MODULE_AUTOLOAD_LIMIT },
3040 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
3043 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3044 const struct nft_expr *expr, bool reset)
3046 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3047 goto nla_put_failure;
3049 if (expr->ops->dump) {
3050 struct nlattr *data = nla_nest_start_noflag(skb,
3053 goto nla_put_failure;
3054 if (expr->ops->dump(skb, expr, reset) < 0)
3055 goto nla_put_failure;
3056 nla_nest_end(skb, data);
3065 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3066 const struct nft_expr *expr, bool reset)
3068 struct nlattr *nest;
3070 nest = nla_nest_start_noflag(skb, attr);
3072 goto nla_put_failure;
3073 if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3074 goto nla_put_failure;
3075 nla_nest_end(skb, nest);
3082 struct nft_expr_info {
3083 const struct nft_expr_ops *ops;
3084 const struct nlattr *attr;
3085 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
3088 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3089 const struct nlattr *nla,
3090 struct nft_expr_info *info)
3092 const struct nft_expr_type *type;
3093 const struct nft_expr_ops *ops;
3094 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3097 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3098 nft_expr_policy, NULL);
3102 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3104 return PTR_ERR(type);
3106 if (tb[NFTA_EXPR_DATA]) {
3107 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3109 type->policy, NULL);
3113 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3115 if (type->select_ops != NULL) {
3116 ops = type->select_ops(ctx,
3117 (const struct nlattr * const *)info->tb);
3120 #ifdef CONFIG_MODULES
3122 if (nft_expr_type_request_module(ctx->net,
3124 tb[NFTA_EXPR_NAME]) != -EAGAIN)
3138 module_put(type->owner);
3142 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3143 struct nft_expr_info *info)
3145 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3146 const struct nft_expr_type *type;
3149 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3150 nft_expr_policy, NULL);
3154 if (!tb[NFTA_EXPR_DATA])
3157 type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3161 if (!type->inner_ops)
3164 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3166 type->policy, NULL);
3171 info->ops = type->inner_ops;
3179 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3180 const struct nft_expr_info *expr_info,
3181 struct nft_expr *expr)
3183 const struct nft_expr_ops *ops = expr_info->ops;
3188 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3199 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3200 struct nft_expr *expr)
3202 const struct nft_expr_type *type = expr->ops->type;
3204 if (expr->ops->destroy)
3205 expr->ops->destroy(ctx, expr);
3206 module_put(type->owner);
3209 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3210 const struct nlattr *nla)
3212 struct nft_expr_info expr_info;
3213 struct nft_expr *expr;
3214 struct module *owner;
3217 err = nf_tables_expr_parse(ctx, nla, &expr_info);
3219 goto err_expr_parse;
3222 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3223 goto err_expr_stateful;
3226 expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3228 goto err_expr_stateful;
3230 err = nf_tables_newexpr(ctx, &expr_info, expr);
3238 owner = expr_info.ops->type->owner;
3239 if (expr_info.ops->type->release_ops)
3240 expr_info.ops->type->release_ops(expr_info.ops);
3244 return ERR_PTR(err);
3247 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3251 if (src->ops->clone) {
3252 dst->ops = src->ops;
3253 err = src->ops->clone(dst, src);
3257 memcpy(dst, src, src->ops->size);
3260 __module_get(src->ops->type->owner);
3265 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3267 nf_tables_expr_destroy(ctx, expr);
3275 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3278 struct nft_rule *rule;
3280 // FIXME: this sucks
3281 list_for_each_entry_rcu(rule, &chain->rules, list) {
3282 if (handle == rule->handle)
3286 return ERR_PTR(-ENOENT);
3289 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3290 const struct nlattr *nla)
3293 return ERR_PTR(-EINVAL);
3295 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3298 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3299 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
3300 .len = NFT_TABLE_MAXNAMELEN - 1 },
3301 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
3302 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3303 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
3304 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3305 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
3306 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
3307 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
3308 .len = NFT_USERDATA_MAXLEN },
3309 [NFTA_RULE_ID] = { .type = NLA_U32 },
3310 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3311 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
3314 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3315 u32 portid, u32 seq, int event,
3316 u32 flags, int family,
3317 const struct nft_table *table,
3318 const struct nft_chain *chain,
3319 const struct nft_rule *rule, u64 handle,
3322 struct nlmsghdr *nlh;
3323 const struct nft_expr *expr, *next;
3324 struct nlattr *list;
3325 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3327 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3330 goto nla_put_failure;
3332 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3333 goto nla_put_failure;
3334 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3335 goto nla_put_failure;
3336 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3338 goto nla_put_failure;
3340 if (event != NFT_MSG_DELRULE && handle) {
3341 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3343 goto nla_put_failure;
3346 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3347 nft_flow_rule_stats(chain, rule);
3349 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3351 goto nla_put_failure;
3352 nft_rule_for_each_expr(expr, next, rule) {
3353 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3354 goto nla_put_failure;
3356 nla_nest_end(skb, list);
3359 struct nft_userdata *udata = nft_userdata(rule);
3360 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3362 goto nla_put_failure;
3365 nlmsg_end(skb, nlh);
3369 nlmsg_trim(skb, nlh);
3373 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3374 const struct nft_rule *rule, int event)
3376 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3377 const struct nft_rule *prule;
3378 struct sk_buff *skb;
3384 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3387 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3391 if (event == NFT_MSG_NEWRULE &&
3392 !list_is_first(&rule->list, &ctx->chain->rules) &&
3393 !list_is_last(&rule->list, &ctx->chain->rules)) {
3394 prule = list_prev_entry(rule, list);
3395 handle = prule->handle;
3397 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3398 flags |= NLM_F_APPEND;
3399 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3400 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3402 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3403 event, flags, ctx->family, ctx->table,
3404 ctx->chain, rule, handle, false);
3410 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3413 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3416 struct nft_rule_dump_ctx {
3421 static int __nf_tables_dump_rules(struct sk_buff *skb,
3423 struct netlink_callback *cb,
3424 const struct nft_table *table,
3425 const struct nft_chain *chain,
3428 struct net *net = sock_net(skb->sk);
3429 const struct nft_rule *rule, *prule;
3430 unsigned int s_idx = cb->args[0];
3434 list_for_each_entry_rcu(rule, &chain->rules, list) {
3435 if (!nft_is_active(net, rule))
3440 memset(&cb->args[1], 0,
3441 sizeof(cb->args) - sizeof(cb->args[0]));
3444 handle = prule->handle;
3448 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3451 NLM_F_MULTI | NLM_F_APPEND,
3453 table, chain, rule, handle, reset) < 0)
3456 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3465 static int nf_tables_dump_rules(struct sk_buff *skb,
3466 struct netlink_callback *cb)
3468 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3469 const struct nft_rule_dump_ctx *ctx = cb->data;
3470 struct nft_table *table;
3471 const struct nft_chain *chain;
3472 unsigned int idx = 0;
3473 struct net *net = sock_net(skb->sk);
3474 int family = nfmsg->nfgen_family;
3475 struct nftables_pernet *nft_net;
3478 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3482 nft_net = nft_pernet(net);
3483 cb->seq = READ_ONCE(nft_net->base_seq);
3485 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3486 if (family != NFPROTO_UNSPEC && family != table->family)
3489 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3492 if (ctx && ctx->table && ctx->chain) {
3493 struct rhlist_head *list, *tmp;
3495 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3496 nft_chain_ht_params);
3500 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3501 if (!nft_is_active(net, chain))
3503 __nf_tables_dump_rules(skb, &idx,
3504 cb, table, chain, reset);
3510 list_for_each_entry_rcu(chain, &table->chains, list) {
3511 if (__nf_tables_dump_rules(skb, &idx,
3512 cb, table, chain, reset))
3516 if (ctx && ctx->table)
3526 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3528 const struct nlattr * const *nla = cb->data;
3529 struct nft_rule_dump_ctx *ctx = NULL;
3531 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3532 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3536 if (nla[NFTA_RULE_TABLE]) {
3537 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3544 if (nla[NFTA_RULE_CHAIN]) {
3545 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3559 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3561 struct nft_rule_dump_ctx *ctx = cb->data;
3571 /* called with rcu_read_lock held */
3572 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3573 const struct nlattr * const nla[])
3575 struct netlink_ext_ack *extack = info->extack;
3576 u8 genmask = nft_genmask_cur(info->net);
3577 u8 family = info->nfmsg->nfgen_family;
3578 const struct nft_chain *chain;
3579 const struct nft_rule *rule;
3580 struct net *net = info->net;
3581 struct nft_table *table;
3582 struct sk_buff *skb2;
3586 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3587 struct netlink_dump_control c = {
3588 .start= nf_tables_dump_rules_start,
3589 .dump = nf_tables_dump_rules,
3590 .done = nf_tables_dump_rules_done,
3591 .module = THIS_MODULE,
3592 .data = (void *)nla,
3595 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3598 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3599 if (IS_ERR(table)) {
3600 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3601 return PTR_ERR(table);
3604 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3605 if (IS_ERR(chain)) {
3606 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3607 return PTR_ERR(chain);
3610 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3612 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3613 return PTR_ERR(rule);
3616 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3620 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3623 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3624 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3625 family, table, chain, rule, 0, reset);
3627 goto err_fill_rule_info;
3629 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3636 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3638 struct nft_expr *expr, *next;
3641 * Careful: some expressions might not be initialized in case this
3642 * is called on error from nf_tables_newrule().
3644 expr = nft_expr_first(rule);
3645 while (nft_expr_more(rule, expr)) {
3646 next = nft_expr_next(expr);
3647 nf_tables_expr_destroy(ctx, expr);
3653 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3655 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3656 nf_tables_rule_destroy(ctx, rule);
3659 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3661 struct nft_expr *expr, *last;
3662 const struct nft_data *data;
3663 struct nft_rule *rule;
3666 if (ctx->level == NFT_JUMP_STACK_SIZE)
3669 list_for_each_entry(rule, &chain->rules, list) {
3670 if (!nft_is_active_next(ctx->net, rule))
3673 nft_rule_for_each_expr(expr, last, rule) {
3674 if (!expr->ops->validate)
3677 err = expr->ops->validate(ctx, expr, &data);
3687 EXPORT_SYMBOL_GPL(nft_chain_validate);
3689 static int nft_table_validate(struct net *net, const struct nft_table *table)
3691 struct nft_chain *chain;
3692 struct nft_ctx ctx = {
3694 .family = table->family,
3698 list_for_each_entry(chain, &table->chains, list) {
3699 if (!nft_is_base_chain(chain))
3703 err = nft_chain_validate(&ctx, chain);
3711 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3712 const struct nft_set_iter *iter,
3713 struct nft_set_elem *elem)
3715 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3716 struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3717 const struct nft_data *data;
3720 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3721 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3724 data = nft_set_ext_data(ext);
3725 switch (data->verdict.code) {
3729 err = nft_chain_validate(ctx, data->verdict.chain);
3741 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3743 u8 genmask = nft_genmask_next(ctx->net);
3744 struct nft_set_elem_catchall *catchall;
3745 struct nft_set_elem elem;
3746 struct nft_set_ext *ext;
3749 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3750 ext = nft_set_elem_ext(set, catchall->elem);
3751 if (!nft_set_elem_active(ext, genmask))
3754 elem.priv = catchall->elem;
3755 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3763 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3764 const struct nft_chain *chain,
3765 const struct nlattr *nla);
3767 #define NFT_RULE_MAXEXPRS 128
3769 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3770 const struct nlattr * const nla[])
3772 struct nftables_pernet *nft_net = nft_pernet(info->net);
3773 struct netlink_ext_ack *extack = info->extack;
3774 unsigned int size, i, n, ulen = 0, usize = 0;
3775 u8 genmask = nft_genmask_next(info->net);
3776 struct nft_rule *rule, *old_rule = NULL;
3777 struct nft_expr_info *expr_info = NULL;
3778 u8 family = info->nfmsg->nfgen_family;
3779 struct nft_flow_rule *flow = NULL;
3780 struct net *net = info->net;
3781 struct nft_userdata *udata;
3782 struct nft_table *table;
3783 struct nft_chain *chain;
3784 struct nft_trans *trans;
3785 u64 handle, pos_handle;
3786 struct nft_expr *expr;
3791 lockdep_assert_held(&nft_net->commit_mutex);
3793 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3794 NETLINK_CB(skb).portid);
3795 if (IS_ERR(table)) {
3796 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3797 return PTR_ERR(table);
3800 if (nla[NFTA_RULE_CHAIN]) {
3801 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3803 if (IS_ERR(chain)) {
3804 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3805 return PTR_ERR(chain);
3807 if (nft_chain_is_bound(chain))
3810 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3811 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
3812 if (IS_ERR(chain)) {
3813 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3814 return PTR_ERR(chain);
3820 if (nla[NFTA_RULE_HANDLE]) {
3821 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3822 rule = __nft_rule_lookup(chain, handle);
3824 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3825 return PTR_ERR(rule);
3828 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3829 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3832 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3837 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3838 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3840 handle = nf_tables_alloc_handle(table);
3842 if (chain->use == UINT_MAX)
3845 if (nla[NFTA_RULE_POSITION]) {
3846 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3847 old_rule = __nft_rule_lookup(chain, pos_handle);
3848 if (IS_ERR(old_rule)) {
3849 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3850 return PTR_ERR(old_rule);
3852 } else if (nla[NFTA_RULE_POSITION_ID]) {
3853 old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3854 if (IS_ERR(old_rule)) {
3855 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3856 return PTR_ERR(old_rule);
3861 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3865 if (nla[NFTA_RULE_EXPRESSIONS]) {
3866 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3867 sizeof(struct nft_expr_info),
3872 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3874 if (nla_type(tmp) != NFTA_LIST_ELEM)
3875 goto err_release_expr;
3876 if (n == NFT_RULE_MAXEXPRS)
3877 goto err_release_expr;
3878 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3880 NL_SET_BAD_ATTR(extack, tmp);
3881 goto err_release_expr;
3883 size += expr_info[n].ops->size;
3887 /* Check for overflow of dlen field */
3889 if (size >= 1 << 12)
3890 goto err_release_expr;
3892 if (nla[NFTA_RULE_USERDATA]) {
3893 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3895 usize = sizeof(struct nft_userdata) + ulen;
3899 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3901 goto err_release_expr;
3903 nft_activate_next(net, rule);
3905 rule->handle = handle;
3907 rule->udata = ulen ? 1 : 0;
3910 udata = nft_userdata(rule);
3911 udata->len = ulen - 1;
3912 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3915 expr = nft_expr_first(rule);
3916 for (i = 0; i < n; i++) {
3917 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3919 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3920 goto err_release_rule;
3923 if (expr_info[i].ops->validate)
3924 nft_validate_state_update(table, NFT_VALIDATE_NEED);
3926 expr_info[i].ops = NULL;
3927 expr = nft_expr_next(expr);
3930 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3931 flow = nft_flow_rule_create(net, rule);
3933 err = PTR_ERR(flow);
3934 goto err_release_rule;
3938 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3939 err = nft_delrule(&ctx, old_rule);
3941 goto err_destroy_flow_rule;
3943 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3944 if (trans == NULL) {
3946 goto err_destroy_flow_rule;
3948 list_add_tail_rcu(&rule->list, &old_rule->list);
3950 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3953 goto err_destroy_flow_rule;
3956 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3958 list_add_rcu(&rule->list, &old_rule->list);
3960 list_add_tail_rcu(&rule->list, &chain->rules);
3963 list_add_tail_rcu(&rule->list, &old_rule->list);
3965 list_add_rcu(&rule->list, &chain->rules);
3972 nft_trans_flow_rule(trans) = flow;
3974 if (table->validate_state == NFT_VALIDATE_DO)
3975 return nft_table_validate(net, table);
3979 err_destroy_flow_rule:
3981 nft_flow_rule_destroy(flow);
3983 nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
3984 nf_tables_rule_destroy(&ctx, rule);
3986 for (i = 0; i < n; i++) {
3987 if (expr_info[i].ops) {
3988 module_put(expr_info[i].ops->type->owner);
3989 if (expr_info[i].ops->type->release_ops)
3990 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3998 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3999 const struct nft_chain *chain,
4000 const struct nlattr *nla)
4002 struct nftables_pernet *nft_net = nft_pernet(net);
4003 u32 id = ntohl(nla_get_be32(nla));
4004 struct nft_trans *trans;
4006 list_for_each_entry(trans, &nft_net->commit_list, list) {
4007 if (trans->msg_type == NFT_MSG_NEWRULE &&
4008 trans->ctx.chain == chain &&
4009 id == nft_trans_rule_id(trans))
4010 return nft_trans_rule(trans);
4012 return ERR_PTR(-ENOENT);
4015 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4016 const struct nlattr * const nla[])
4018 struct netlink_ext_ack *extack = info->extack;
4019 u8 genmask = nft_genmask_next(info->net);
4020 u8 family = info->nfmsg->nfgen_family;
4021 struct nft_chain *chain = NULL;
4022 struct net *net = info->net;
4023 struct nft_table *table;
4024 struct nft_rule *rule;
4028 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4029 NETLINK_CB(skb).portid);
4030 if (IS_ERR(table)) {
4031 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4032 return PTR_ERR(table);
4035 if (nla[NFTA_RULE_CHAIN]) {
4036 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4038 if (IS_ERR(chain)) {
4039 if (PTR_ERR(chain) == -ENOENT &&
4040 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4043 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4044 return PTR_ERR(chain);
4046 if (nft_chain_is_bound(chain))
4050 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4053 if (nla[NFTA_RULE_HANDLE]) {
4054 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4056 if (PTR_ERR(rule) == -ENOENT &&
4057 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4060 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4061 return PTR_ERR(rule);
4064 err = nft_delrule(&ctx, rule);
4065 } else if (nla[NFTA_RULE_ID]) {
4066 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4068 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4069 return PTR_ERR(rule);
4072 err = nft_delrule(&ctx, rule);
4074 err = nft_delrule_by_chain(&ctx);
4077 list_for_each_entry(chain, &table->chains, list) {
4078 if (!nft_is_active_next(net, chain))
4082 err = nft_delrule_by_chain(&ctx);
4094 static const struct nft_set_type *nft_set_types[] = {
4095 &nft_set_hash_fast_type,
4097 &nft_set_rhash_type,
4098 &nft_set_bitmap_type,
4099 &nft_set_rbtree_type,
4100 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4101 &nft_set_pipapo_avx2_type,
4103 &nft_set_pipapo_type,
4106 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
4107 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4110 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4112 return (flags & type->features) == (flags & NFT_SET_FEATURES);
4116 * Select a set implementation based on the data characteristics and the
4117 * given policy. The total memory use might not be known if no size is
4118 * given, in that case the amount of memory per element is used.
4120 static const struct nft_set_ops *
4121 nft_select_set_ops(const struct nft_ctx *ctx,
4122 const struct nlattr * const nla[],
4123 const struct nft_set_desc *desc)
4125 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4126 const struct nft_set_ops *ops, *bops;
4127 struct nft_set_estimate est, best;
4128 const struct nft_set_type *type;
4132 lockdep_assert_held(&nft_net->commit_mutex);
4133 lockdep_nfnl_nft_mutex_not_held();
4135 if (nla[NFTA_SET_FLAGS] != NULL)
4136 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4143 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4144 type = nft_set_types[i];
4147 if (!nft_set_ops_candidate(type, flags))
4149 if (!ops->estimate(desc, flags, &est))
4152 switch (desc->policy) {
4153 case NFT_SET_POL_PERFORMANCE:
4154 if (est.lookup < best.lookup)
4156 if (est.lookup == best.lookup &&
4157 est.space < best.space)
4160 case NFT_SET_POL_MEMORY:
4162 if (est.space < best.space)
4164 if (est.space == best.space &&
4165 est.lookup < best.lookup)
4167 } else if (est.size < best.size || !bops) {
4182 return ERR_PTR(-EOPNOTSUPP);
4185 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4186 [NFTA_SET_TABLE] = { .type = NLA_STRING,
4187 .len = NFT_TABLE_MAXNAMELEN - 1 },
4188 [NFTA_SET_NAME] = { .type = NLA_STRING,
4189 .len = NFT_SET_MAXNAMELEN - 1 },
4190 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
4191 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
4192 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
4193 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
4194 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
4195 [NFTA_SET_POLICY] = { .type = NLA_U32 },
4196 [NFTA_SET_DESC] = { .type = NLA_NESTED },
4197 [NFTA_SET_ID] = { .type = NLA_U32 },
4198 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
4199 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
4200 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
4201 .len = NFT_USERDATA_MAXLEN },
4202 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
4203 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
4204 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
4205 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
4208 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4209 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
4210 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
4213 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4214 const struct nlattr *nla, u8 genmask)
4216 struct nft_set *set;
4219 return ERR_PTR(-EINVAL);
4221 list_for_each_entry_rcu(set, &table->sets, list) {
4222 if (!nla_strcmp(nla, set->name) &&
4223 nft_active_genmask(set, genmask))
4226 return ERR_PTR(-ENOENT);
4229 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4230 const struct nlattr *nla,
4233 struct nft_set *set;
4235 list_for_each_entry(set, &table->sets, list) {
4236 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4237 nft_active_genmask(set, genmask))
4240 return ERR_PTR(-ENOENT);
4243 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4244 const struct nft_table *table,
4245 const struct nlattr *nla, u8 genmask)
4247 struct nftables_pernet *nft_net = nft_pernet(net);
4248 u32 id = ntohl(nla_get_be32(nla));
4249 struct nft_trans *trans;
4251 list_for_each_entry(trans, &nft_net->commit_list, list) {
4252 if (trans->msg_type == NFT_MSG_NEWSET) {
4253 struct nft_set *set = nft_trans_set(trans);
4255 if (id == nft_trans_set_id(trans) &&
4256 set->table == table &&
4257 nft_active_genmask(set, genmask))
4261 return ERR_PTR(-ENOENT);
4264 struct nft_set *nft_set_lookup_global(const struct net *net,
4265 const struct nft_table *table,
4266 const struct nlattr *nla_set_name,
4267 const struct nlattr *nla_set_id,
4270 struct nft_set *set;
4272 set = nft_set_lookup(table, nla_set_name, genmask);
4277 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4281 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4283 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4286 const struct nft_set *i;
4288 unsigned long *inuse;
4289 unsigned int n = 0, min = 0;
4291 p = strchr(name, '%');
4293 if (p[1] != 'd' || strchr(p + 2, '%'))
4296 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4300 list_for_each_entry(i, &ctx->table->sets, list) {
4303 if (!nft_is_active_next(ctx->net, i))
4305 if (!sscanf(i->name, name, &tmp))
4307 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4310 set_bit(tmp - min, inuse);
4313 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4314 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4315 min += BITS_PER_BYTE * PAGE_SIZE;
4316 memset(inuse, 0, PAGE_SIZE);
4319 free_page((unsigned long)inuse);
4322 set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4326 list_for_each_entry(i, &ctx->table->sets, list) {
4327 if (!nft_is_active_next(ctx->net, i))
4329 if (!strcmp(set->name, i->name)) {
4338 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4340 u64 ms = be64_to_cpu(nla_get_be64(nla));
4341 u64 max = (u64)(~((u64)0));
4343 max = div_u64(max, NSEC_PER_MSEC);
4347 ms *= NSEC_PER_MSEC;
4348 *result = nsecs_to_jiffies64(ms);
4352 __be64 nf_jiffies64_to_msecs(u64 input)
4354 return cpu_to_be64(jiffies64_to_msecs(input));
4357 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4358 const struct nft_set *set)
4360 struct nlattr *concat, *field;
4363 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4367 for (i = 0; i < set->field_count; i++) {
4368 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4372 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4373 htonl(set->field_len[i])))
4376 nla_nest_end(skb, field);
4379 nla_nest_end(skb, concat);
4384 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4385 const struct nft_set *set, u16 event, u16 flags)
4387 u64 timeout = READ_ONCE(set->timeout);
4388 u32 gc_int = READ_ONCE(set->gc_int);
4389 u32 portid = ctx->portid;
4390 struct nlmsghdr *nlh;
4391 struct nlattr *nest;
4395 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4396 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4397 NFNETLINK_V0, nft_base_seq(ctx->net));
4399 goto nla_put_failure;
4401 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4402 goto nla_put_failure;
4403 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4404 goto nla_put_failure;
4405 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4407 goto nla_put_failure;
4409 if (event == NFT_MSG_DELSET) {
4410 nlmsg_end(skb, nlh);
4414 if (set->flags != 0)
4415 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4416 goto nla_put_failure;
4418 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4419 goto nla_put_failure;
4420 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4421 goto nla_put_failure;
4422 if (set->flags & NFT_SET_MAP) {
4423 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4424 goto nla_put_failure;
4425 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4426 goto nla_put_failure;
4428 if (set->flags & NFT_SET_OBJECT &&
4429 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4430 goto nla_put_failure;
4433 nla_put_be64(skb, NFTA_SET_TIMEOUT,
4434 nf_jiffies64_to_msecs(timeout),
4436 goto nla_put_failure;
4438 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4439 goto nla_put_failure;
4441 if (set->policy != NFT_SET_POL_PERFORMANCE) {
4442 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4443 goto nla_put_failure;
4447 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4448 goto nla_put_failure;
4450 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4452 goto nla_put_failure;
4454 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4455 goto nla_put_failure;
4457 if (set->field_count > 1 &&
4458 nf_tables_fill_set_concat(skb, set))
4459 goto nla_put_failure;
4461 nla_nest_end(skb, nest);
4463 if (set->num_exprs == 1) {
4464 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4465 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4466 goto nla_put_failure;
4468 nla_nest_end(skb, nest);
4469 } else if (set->num_exprs > 1) {
4470 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4472 goto nla_put_failure;
4474 for (i = 0; i < set->num_exprs; i++) {
4475 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4476 set->exprs[i], false) < 0)
4477 goto nla_put_failure;
4479 nla_nest_end(skb, nest);
4482 nlmsg_end(skb, nlh);
4486 nlmsg_trim(skb, nlh);
4490 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4491 const struct nft_set *set, int event,
4494 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4495 u32 portid = ctx->portid;
4496 struct sk_buff *skb;
4501 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4504 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4508 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4509 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4511 err = nf_tables_fill_set(skb, ctx, set, event, flags);
4517 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4520 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4523 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4525 const struct nft_set *set;
4526 unsigned int idx, s_idx = cb->args[0];
4527 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4528 struct net *net = sock_net(skb->sk);
4529 struct nft_ctx *ctx = cb->data, ctx_set;
4530 struct nftables_pernet *nft_net;
4536 nft_net = nft_pernet(net);
4537 cb->seq = READ_ONCE(nft_net->base_seq);
4539 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4540 if (ctx->family != NFPROTO_UNSPEC &&
4541 ctx->family != table->family)
4544 if (ctx->table && ctx->table != table)
4548 if (cur_table != table)
4554 list_for_each_entry_rcu(set, &table->sets, list) {
4557 if (!nft_is_active(net, set))
4561 ctx_set.table = table;
4562 ctx_set.family = table->family;
4564 if (nf_tables_fill_set(skb, &ctx_set, set,
4568 cb->args[2] = (unsigned long) table;
4571 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4584 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4586 struct nft_ctx *ctx_dump = NULL;
4588 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4589 if (ctx_dump == NULL)
4592 cb->data = ctx_dump;
4596 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4602 /* called with rcu_read_lock held */
4603 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4604 const struct nlattr * const nla[])
4606 struct netlink_ext_ack *extack = info->extack;
4607 u8 genmask = nft_genmask_cur(info->net);
4608 u8 family = info->nfmsg->nfgen_family;
4609 struct nft_table *table = NULL;
4610 struct net *net = info->net;
4611 const struct nft_set *set;
4612 struct sk_buff *skb2;
4616 if (nla[NFTA_SET_TABLE]) {
4617 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4619 if (IS_ERR(table)) {
4620 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4621 return PTR_ERR(table);
4625 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4627 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4628 struct netlink_dump_control c = {
4629 .start = nf_tables_dump_sets_start,
4630 .dump = nf_tables_dump_sets,
4631 .done = nf_tables_dump_sets_done,
4633 .module = THIS_MODULE,
4636 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4639 /* Only accept unspec with dump */
4640 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4641 return -EAFNOSUPPORT;
4642 if (!nla[NFTA_SET_TABLE])
4645 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4647 return PTR_ERR(set);
4649 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4653 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4655 goto err_fill_set_info;
4657 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4664 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4665 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4668 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4669 struct nft_set_desc *desc)
4671 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4675 if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4678 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4679 nft_concat_policy, NULL);
4683 if (!tb[NFTA_SET_FIELD_LEN])
4686 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4687 if (!len || len > U8_MAX)
4690 desc->field_len[desc->field_count++] = len;
4695 static int nft_set_desc_concat(struct nft_set_desc *desc,
4696 const struct nlattr *nla)
4698 struct nlattr *attr;
4702 nla_for_each_nested(attr, nla, rem) {
4703 if (nla_type(attr) != NFTA_LIST_ELEM)
4706 err = nft_set_desc_concat_parse(attr, desc);
4711 for (i = 0; i < desc->field_count; i++)
4712 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4714 if (num_regs > NFT_REG32_COUNT)
4720 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4721 const struct nlattr *nla)
4723 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4726 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4727 nft_set_desc_policy, NULL);
4731 if (da[NFTA_SET_DESC_SIZE] != NULL)
4732 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4733 if (da[NFTA_SET_DESC_CONCAT])
4734 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4739 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4740 const struct nlattr * const *nla,
4741 struct nft_expr **exprs, int *num_exprs,
4744 struct nft_expr *expr;
4747 if (nla[NFTA_SET_EXPR]) {
4748 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4750 err = PTR_ERR(expr);
4751 goto err_set_expr_alloc;
4755 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4759 if (!(flags & NFT_SET_EXPR)) {
4761 goto err_set_expr_alloc;
4764 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4765 if (i == NFT_SET_EXPR_MAX) {
4767 goto err_set_expr_alloc;
4769 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4771 goto err_set_expr_alloc;
4773 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4775 err = PTR_ERR(expr);
4776 goto err_set_expr_alloc;
4786 for (i = 0; i < *num_exprs; i++)
4787 nft_expr_destroy(ctx, exprs[i]);
4792 static bool nft_set_is_same(const struct nft_set *set,
4793 const struct nft_set_desc *desc,
4794 struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4798 if (set->ktype != desc->ktype ||
4799 set->dtype != desc->dtype ||
4800 set->flags != flags ||
4801 set->klen != desc->klen ||
4802 set->dlen != desc->dlen ||
4803 set->field_count != desc->field_count ||
4804 set->num_exprs != num_exprs)
4807 for (i = 0; i < desc->field_count; i++) {
4808 if (set->field_len[i] != desc->field_len[i])
4812 for (i = 0; i < num_exprs; i++) {
4813 if (set->exprs[i]->ops != exprs[i]->ops)
4820 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4821 const struct nlattr * const nla[])
4823 struct netlink_ext_ack *extack = info->extack;
4824 u8 genmask = nft_genmask_next(info->net);
4825 u8 family = info->nfmsg->nfgen_family;
4826 const struct nft_set_ops *ops;
4827 struct net *net = info->net;
4828 struct nft_set_desc desc;
4829 struct nft_table *table;
4830 unsigned char *udata;
4831 struct nft_set *set;
4841 if (nla[NFTA_SET_TABLE] == NULL ||
4842 nla[NFTA_SET_NAME] == NULL ||
4843 nla[NFTA_SET_KEY_LEN] == NULL ||
4844 nla[NFTA_SET_ID] == NULL)
4847 memset(&desc, 0, sizeof(desc));
4849 desc.ktype = NFT_DATA_VALUE;
4850 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4851 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4852 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4856 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4857 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4861 if (nla[NFTA_SET_FLAGS] != NULL) {
4862 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4863 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4864 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4865 NFT_SET_MAP | NFT_SET_EVAL |
4866 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4868 /* Only one of these operations is supported */
4869 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4870 (NFT_SET_MAP | NFT_SET_OBJECT))
4872 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4873 (NFT_SET_EVAL | NFT_SET_OBJECT))
4878 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4879 if (!(flags & NFT_SET_MAP))
4882 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4883 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4884 desc.dtype != NFT_DATA_VERDICT)
4887 if (desc.dtype != NFT_DATA_VERDICT) {
4888 if (nla[NFTA_SET_DATA_LEN] == NULL)
4890 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4891 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4894 desc.dlen = sizeof(struct nft_verdict);
4895 } else if (flags & NFT_SET_MAP)
4898 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4899 if (!(flags & NFT_SET_OBJECT))
4902 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4903 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4904 desc.objtype > NFT_OBJECT_MAX)
4906 } else if (flags & NFT_SET_OBJECT)
4909 desc.objtype = NFT_OBJECT_UNSPEC;
4912 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4913 if (!(flags & NFT_SET_TIMEOUT))
4916 if (flags & NFT_SET_ANONYMOUS)
4919 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4924 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4925 if (!(flags & NFT_SET_TIMEOUT))
4928 if (flags & NFT_SET_ANONYMOUS)
4931 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4934 desc.policy = NFT_SET_POL_PERFORMANCE;
4935 if (nla[NFTA_SET_POLICY] != NULL)
4936 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4938 if (nla[NFTA_SET_DESC] != NULL) {
4939 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4943 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4945 } else if (flags & NFT_SET_CONCAT) {
4949 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4952 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4953 NETLINK_CB(skb).portid);
4954 if (IS_ERR(table)) {
4955 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4956 return PTR_ERR(table);
4959 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4961 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4963 if (PTR_ERR(set) != -ENOENT) {
4964 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4965 return PTR_ERR(set);
4968 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
4970 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4971 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4974 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4977 if (nft_set_is_anonymous(set))
4980 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
4985 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
4986 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4990 for (i = 0; i < num_exprs; i++)
4991 nft_expr_destroy(&ctx, exprs[i]);
4996 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
4999 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5002 ops = nft_select_set_ops(&ctx, nla, &desc);
5004 return PTR_ERR(ops);
5007 if (nla[NFTA_SET_USERDATA])
5008 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5011 if (ops->privsize != NULL)
5012 size = ops->privsize(nla, &desc);
5013 alloc_size = sizeof(*set) + size + udlen;
5014 if (alloc_size < size || alloc_size > INT_MAX)
5016 set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5020 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5026 err = nf_tables_set_alloc_name(&ctx, set, name);
5033 udata = set->data + size;
5034 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5037 INIT_LIST_HEAD(&set->bindings);
5038 INIT_LIST_HEAD(&set->catchall_list);
5040 write_pnet(&set->net, net);
5042 set->ktype = desc.ktype;
5043 set->klen = desc.klen;
5044 set->dtype = desc.dtype;
5045 set->objtype = desc.objtype;
5046 set->dlen = desc.dlen;
5048 set->size = desc.size;
5049 set->policy = desc.policy;
5052 set->timeout = desc.timeout;
5053 set->gc_int = desc.gc_int;
5055 set->field_count = desc.field_count;
5056 for (i = 0; i < desc.field_count; i++)
5057 set->field_len[i] = desc.field_len[i];
5059 err = ops->init(set, &desc, nla);
5063 err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5065 goto err_set_destroy;
5067 set->num_exprs = num_exprs;
5068 set->handle = nf_tables_alloc_handle(table);
5069 INIT_LIST_HEAD(&set->pending_update);
5071 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5073 goto err_set_expr_alloc;
5075 list_add_tail_rcu(&set->list, &table->sets);
5080 for (i = 0; i < set->num_exprs; i++)
5081 nft_expr_destroy(&ctx, set->exprs[i]);
5083 ops->destroy(&ctx, set);
5091 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5092 struct nft_set *set)
5094 struct nft_set_elem_catchall *next, *catchall;
5096 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5097 list_del_rcu(&catchall->list);
5098 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5099 kfree_rcu(catchall, rcu);
5103 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5107 if (WARN_ON(set->use > 0))
5110 for (i = 0; i < set->num_exprs; i++)
5111 nft_expr_destroy(ctx, set->exprs[i]);
5113 set->ops->destroy(ctx, set);
5114 nft_set_catchall_destroy(ctx, set);
5119 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5120 const struct nlattr * const nla[])
5122 struct netlink_ext_ack *extack = info->extack;
5123 u8 genmask = nft_genmask_next(info->net);
5124 u8 family = info->nfmsg->nfgen_family;
5125 struct net *net = info->net;
5126 const struct nlattr *attr;
5127 struct nft_table *table;
5128 struct nft_set *set;
5131 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5132 return -EAFNOSUPPORT;
5134 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5135 genmask, NETLINK_CB(skb).portid);
5136 if (IS_ERR(table)) {
5137 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5138 return PTR_ERR(table);
5141 if (nla[NFTA_SET_HANDLE]) {
5142 attr = nla[NFTA_SET_HANDLE];
5143 set = nft_set_lookup_byhandle(table, attr, genmask);
5145 attr = nla[NFTA_SET_NAME];
5146 set = nft_set_lookup(table, attr, genmask);
5150 if (PTR_ERR(set) == -ENOENT &&
5151 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5154 NL_SET_BAD_ATTR(extack, attr);
5155 return PTR_ERR(set);
5158 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5159 atomic_read(&set->nelems) > 0)) {
5160 NL_SET_BAD_ATTR(extack, attr);
5164 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5166 return nft_delset(&ctx, set);
5169 static int nft_validate_register_store(const struct nft_ctx *ctx,
5170 enum nft_registers reg,
5171 const struct nft_data *data,
5172 enum nft_data_types type,
5175 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5176 struct nft_set *set,
5177 struct nft_set_elem *elem)
5179 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5180 enum nft_registers dreg;
5182 dreg = nft_type_to_reg(set->dtype);
5183 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5184 set->dtype == NFT_DATA_VERDICT ?
5185 NFT_DATA_VERDICT : NFT_DATA_VALUE,
5189 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5190 struct nft_set *set,
5191 const struct nft_set_iter *iter,
5192 struct nft_set_elem *elem)
5194 return nft_setelem_data_validate(ctx, set, elem);
5197 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5198 struct nft_set *set)
5200 u8 genmask = nft_genmask_next(ctx->net);
5201 struct nft_set_elem_catchall *catchall;
5202 struct nft_set_elem elem;
5203 struct nft_set_ext *ext;
5206 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5207 ext = nft_set_elem_ext(set, catchall->elem);
5208 if (!nft_set_elem_active(ext, genmask))
5211 elem.priv = catchall->elem;
5212 ret = nft_setelem_data_validate(ctx, set, &elem);
5220 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5221 struct nft_set_binding *binding)
5223 struct nft_set_binding *i;
5224 struct nft_set_iter iter;
5226 if (set->use == UINT_MAX)
5229 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5232 if (binding->flags & NFT_SET_MAP) {
5233 /* If the set is already bound to the same chain all
5234 * jumps are already validated for that chain.
5236 list_for_each_entry(i, &set->bindings, list) {
5237 if (i->flags & NFT_SET_MAP &&
5238 i->chain == binding->chain)
5242 iter.genmask = nft_genmask_next(ctx->net);
5246 iter.fn = nf_tables_bind_check_setelem;
5248 set->ops->walk(ctx, set, &iter);
5250 iter.err = nft_set_catchall_bind_check(ctx, set);
5256 binding->chain = ctx->chain;
5257 list_add_tail_rcu(&binding->list, &set->bindings);
5258 nft_set_trans_bind(ctx, set);
5263 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5265 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5266 struct nft_set_binding *binding, bool event)
5268 list_del_rcu(&binding->list);
5270 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5271 list_del_rcu(&set->list);
5273 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5278 static void nft_setelem_data_activate(const struct net *net,
5279 const struct nft_set *set,
5280 struct nft_set_elem *elem);
5282 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5283 struct nft_set *set,
5284 const struct nft_set_iter *iter,
5285 struct nft_set_elem *elem)
5287 nft_setelem_data_activate(ctx->net, set, elem);
5292 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5293 struct nft_set *set)
5295 u8 genmask = nft_genmask_next(ctx->net);
5296 struct nft_set_elem_catchall *catchall;
5297 struct nft_set_elem elem;
5298 struct nft_set_ext *ext;
5300 list_for_each_entry(catchall, &set->catchall_list, list) {
5301 ext = nft_set_elem_ext(set, catchall->elem);
5302 if (!nft_set_elem_active(ext, genmask))
5305 elem.priv = catchall->elem;
5306 nft_setelem_data_activate(ctx->net, set, &elem);
5311 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5313 struct nft_set_iter iter = {
5314 .genmask = nft_genmask_next(ctx->net),
5315 .fn = nft_mapelem_activate,
5318 set->ops->walk(ctx, set, &iter);
5319 WARN_ON_ONCE(iter.err);
5321 nft_map_catchall_activate(ctx, set);
5324 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5326 if (nft_set_is_anonymous(set)) {
5327 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5328 nft_map_activate(ctx, set);
5330 nft_clear(ctx->net, set);
5335 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5337 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5338 struct nft_set_binding *binding,
5339 enum nft_trans_phase phase)
5342 case NFT_TRANS_PREPARE_ERROR:
5343 nft_set_trans_unbind(ctx, set);
5344 if (nft_set_is_anonymous(set))
5345 nft_deactivate_next(ctx->net, set);
5349 case NFT_TRANS_PREPARE:
5350 if (nft_set_is_anonymous(set)) {
5351 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5352 nft_map_deactivate(ctx, set);
5354 nft_deactivate_next(ctx->net, set);
5358 case NFT_TRANS_ABORT:
5359 case NFT_TRANS_RELEASE:
5360 if (nft_set_is_anonymous(set) &&
5361 set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5362 nft_map_deactivate(ctx, set);
5367 nf_tables_unbind_set(ctx, set, binding,
5368 phase == NFT_TRANS_COMMIT);
5371 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5373 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5375 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5376 nft_set_destroy(ctx, set);
5378 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5380 const struct nft_set_ext_type nft_set_ext_types[] = {
5381 [NFT_SET_EXT_KEY] = {
5382 .align = __alignof__(u32),
5384 [NFT_SET_EXT_DATA] = {
5385 .align = __alignof__(u32),
5387 [NFT_SET_EXT_EXPRESSIONS] = {
5388 .align = __alignof__(struct nft_set_elem_expr),
5390 [NFT_SET_EXT_OBJREF] = {
5391 .len = sizeof(struct nft_object *),
5392 .align = __alignof__(struct nft_object *),
5394 [NFT_SET_EXT_FLAGS] = {
5396 .align = __alignof__(u8),
5398 [NFT_SET_EXT_TIMEOUT] = {
5400 .align = __alignof__(u64),
5402 [NFT_SET_EXT_EXPIRATION] = {
5404 .align = __alignof__(u64),
5406 [NFT_SET_EXT_USERDATA] = {
5407 .len = sizeof(struct nft_userdata),
5408 .align = __alignof__(struct nft_userdata),
5410 [NFT_SET_EXT_KEY_END] = {
5411 .align = __alignof__(u32),
5419 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5420 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
5421 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
5422 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
5423 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
5424 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
5425 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
5426 .len = NFT_USERDATA_MAXLEN },
5427 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
5428 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
5429 .len = NFT_OBJ_MAXNAMELEN - 1 },
5430 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
5431 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
5434 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5435 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
5436 .len = NFT_TABLE_MAXNAMELEN - 1 },
5437 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
5438 .len = NFT_SET_MAXNAMELEN - 1 },
5439 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
5440 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
5443 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5444 const struct nft_set *set,
5445 const struct nft_set_ext *ext)
5447 struct nft_set_elem_expr *elem_expr;
5448 u32 size, num_exprs = 0;
5449 struct nft_expr *expr;
5450 struct nlattr *nest;
5452 elem_expr = nft_set_ext_expr(ext);
5453 nft_setelem_expr_foreach(expr, elem_expr, size)
5456 if (num_exprs == 1) {
5457 expr = nft_setelem_expr_at(elem_expr, 0);
5458 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, false) < 0)
5462 } else if (num_exprs > 1) {
5463 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5465 goto nla_put_failure;
5467 nft_setelem_expr_foreach(expr, elem_expr, size) {
5468 expr = nft_setelem_expr_at(elem_expr, size);
5469 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, false) < 0)
5470 goto nla_put_failure;
5472 nla_nest_end(skb, nest);
5480 static int nf_tables_fill_setelem(struct sk_buff *skb,
5481 const struct nft_set *set,
5482 const struct nft_set_elem *elem)
5484 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5485 unsigned char *b = skb_tail_pointer(skb);
5486 struct nlattr *nest;
5488 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5490 goto nla_put_failure;
5492 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5493 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5494 NFT_DATA_VALUE, set->klen) < 0)
5495 goto nla_put_failure;
5497 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5498 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5499 NFT_DATA_VALUE, set->klen) < 0)
5500 goto nla_put_failure;
5502 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5503 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5504 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5506 goto nla_put_failure;
5508 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5509 nft_set_elem_expr_dump(skb, set, ext))
5510 goto nla_put_failure;
5512 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5513 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5514 (*nft_set_ext_obj(ext))->key.name) < 0)
5515 goto nla_put_failure;
5517 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5518 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5519 htonl(*nft_set_ext_flags(ext))))
5520 goto nla_put_failure;
5522 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5523 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5524 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5526 goto nla_put_failure;
5528 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5529 u64 expires, now = get_jiffies_64();
5531 expires = *nft_set_ext_expiration(ext);
5532 if (time_before64(now, expires))
5537 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5538 nf_jiffies64_to_msecs(expires),
5540 goto nla_put_failure;
5543 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5544 struct nft_userdata *udata;
5546 udata = nft_set_ext_userdata(ext);
5547 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5548 udata->len + 1, udata->data))
5549 goto nla_put_failure;
5552 nla_nest_end(skb, nest);
5560 struct nft_set_dump_args {
5561 const struct netlink_callback *cb;
5562 struct nft_set_iter iter;
5563 struct sk_buff *skb;
5566 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5567 struct nft_set *set,
5568 const struct nft_set_iter *iter,
5569 struct nft_set_elem *elem)
5571 struct nft_set_dump_args *args;
5573 args = container_of(iter, struct nft_set_dump_args, iter);
5574 return nf_tables_fill_setelem(args->skb, set, elem);
5577 struct nft_set_dump_ctx {
5578 const struct nft_set *set;
5582 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5583 const struct nft_set *set)
5585 struct nft_set_elem_catchall *catchall;
5586 u8 genmask = nft_genmask_cur(net);
5587 struct nft_set_elem elem;
5588 struct nft_set_ext *ext;
5591 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5592 ext = nft_set_elem_ext(set, catchall->elem);
5593 if (!nft_set_elem_active(ext, genmask) ||
5594 nft_set_elem_expired(ext))
5597 elem.priv = catchall->elem;
5598 ret = nf_tables_fill_setelem(skb, set, &elem);
5605 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5607 struct nft_set_dump_ctx *dump_ctx = cb->data;
5608 struct net *net = sock_net(skb->sk);
5609 struct nftables_pernet *nft_net;
5610 struct nft_table *table;
5611 struct nft_set *set;
5612 struct nft_set_dump_args args;
5613 bool set_found = false;
5614 struct nlmsghdr *nlh;
5615 struct nlattr *nest;
5620 nft_net = nft_pernet(net);
5621 cb->seq = READ_ONCE(nft_net->base_seq);
5623 list_for_each_entry_rcu(table, &nft_net->tables, list) {
5624 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5625 dump_ctx->ctx.family != table->family)
5628 if (table != dump_ctx->ctx.table)
5631 list_for_each_entry_rcu(set, &table->sets, list) {
5632 if (set == dump_ctx->set) {
5645 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5646 portid = NETLINK_CB(cb->skb).portid;
5647 seq = cb->nlh->nlmsg_seq;
5649 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5650 table->family, NFNETLINK_V0, nft_base_seq(net));
5652 goto nla_put_failure;
5654 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5655 goto nla_put_failure;
5656 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5657 goto nla_put_failure;
5659 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5661 goto nla_put_failure;
5665 args.iter.genmask = nft_genmask_cur(net);
5666 args.iter.skip = cb->args[0];
5667 args.iter.count = 0;
5669 args.iter.fn = nf_tables_dump_setelem;
5670 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5672 if (!args.iter.err && args.iter.count == cb->args[0])
5673 args.iter.err = nft_set_catchall_dump(net, skb, set);
5676 nla_nest_end(skb, nest);
5677 nlmsg_end(skb, nlh);
5679 if (args.iter.err && args.iter.err != -EMSGSIZE)
5680 return args.iter.err;
5681 if (args.iter.count == cb->args[0])
5684 cb->args[0] = args.iter.count;
5692 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5694 struct nft_set_dump_ctx *dump_ctx = cb->data;
5696 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5698 return cb->data ? 0 : -ENOMEM;
5701 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5707 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5708 const struct nft_ctx *ctx, u32 seq,
5709 u32 portid, int event, u16 flags,
5710 const struct nft_set *set,
5711 const struct nft_set_elem *elem)
5713 struct nlmsghdr *nlh;
5714 struct nlattr *nest;
5717 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5718 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5719 NFNETLINK_V0, nft_base_seq(ctx->net));
5721 goto nla_put_failure;
5723 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5724 goto nla_put_failure;
5725 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5726 goto nla_put_failure;
5728 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5730 goto nla_put_failure;
5732 err = nf_tables_fill_setelem(skb, set, elem);
5734 goto nla_put_failure;
5736 nla_nest_end(skb, nest);
5738 nlmsg_end(skb, nlh);
5742 nlmsg_trim(skb, nlh);
5746 static int nft_setelem_parse_flags(const struct nft_set *set,
5747 const struct nlattr *attr, u32 *flags)
5752 *flags = ntohl(nla_get_be32(attr));
5753 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5755 if (!(set->flags & NFT_SET_INTERVAL) &&
5756 *flags & NFT_SET_ELEM_INTERVAL_END)
5758 if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5759 (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5765 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5766 struct nft_data *key, struct nlattr *attr)
5768 struct nft_data_desc desc = {
5769 .type = NFT_DATA_VALUE,
5770 .size = NFT_DATA_VALUE_MAXLEN,
5774 return nft_data_init(ctx, key, &desc, attr);
5777 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5778 struct nft_data_desc *desc,
5779 struct nft_data *data,
5780 struct nlattr *attr)
5784 if (set->dtype == NFT_DATA_VERDICT)
5785 dtype = NFT_DATA_VERDICT;
5787 dtype = NFT_DATA_VALUE;
5790 desc->size = NFT_DATA_VALUE_MAXLEN;
5791 desc->len = set->dlen;
5792 desc->flags = NFT_DATA_DESC_SETELEM;
5794 return nft_data_init(ctx, data, desc, attr);
5797 static void *nft_setelem_catchall_get(const struct net *net,
5798 const struct nft_set *set)
5800 struct nft_set_elem_catchall *catchall;
5801 u8 genmask = nft_genmask_cur(net);
5802 struct nft_set_ext *ext;
5805 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5806 ext = nft_set_elem_ext(set, catchall->elem);
5807 if (!nft_set_elem_active(ext, genmask) ||
5808 nft_set_elem_expired(ext))
5811 priv = catchall->elem;
5818 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5819 struct nft_set_elem *elem, u32 flags)
5823 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5824 priv = set->ops->get(ctx->net, set, elem, flags);
5826 return PTR_ERR(priv);
5828 priv = nft_setelem_catchall_get(ctx->net, set);
5837 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5838 const struct nlattr *attr)
5840 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5841 struct nft_set_elem elem;
5842 struct sk_buff *skb;
5846 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5847 nft_set_elem_policy, NULL);
5851 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5855 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5858 if (nla[NFTA_SET_ELEM_KEY]) {
5859 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5860 nla[NFTA_SET_ELEM_KEY]);
5865 if (nla[NFTA_SET_ELEM_KEY_END]) {
5866 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5867 nla[NFTA_SET_ELEM_KEY_END]);
5872 err = nft_setelem_get(ctx, set, &elem, flags);
5877 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5881 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5882 NFT_MSG_NEWSETELEM, 0, set, &elem);
5884 goto err_fill_setelem;
5886 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5893 /* called with rcu_read_lock held */
5894 static int nf_tables_getsetelem(struct sk_buff *skb,
5895 const struct nfnl_info *info,
5896 const struct nlattr * const nla[])
5898 struct netlink_ext_ack *extack = info->extack;
5899 u8 genmask = nft_genmask_cur(info->net);
5900 u8 family = info->nfmsg->nfgen_family;
5901 struct net *net = info->net;
5902 struct nft_table *table;
5903 struct nft_set *set;
5904 struct nlattr *attr;
5908 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5910 if (IS_ERR(table)) {
5911 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5912 return PTR_ERR(table);
5915 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5917 return PTR_ERR(set);
5919 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5921 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5922 struct netlink_dump_control c = {
5923 .start = nf_tables_dump_set_start,
5924 .dump = nf_tables_dump_set,
5925 .done = nf_tables_dump_set_done,
5926 .module = THIS_MODULE,
5928 struct nft_set_dump_ctx dump_ctx = {
5934 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5937 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5940 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5941 err = nft_get_set_elem(&ctx, set, attr);
5943 NL_SET_BAD_ATTR(extack, attr);
5951 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5952 const struct nft_set *set,
5953 const struct nft_set_elem *elem,
5956 struct nftables_pernet *nft_net;
5957 struct net *net = ctx->net;
5958 u32 portid = ctx->portid;
5959 struct sk_buff *skb;
5963 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5966 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5970 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5971 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5973 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5980 nft_net = nft_pernet(net);
5981 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5984 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5987 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5989 struct nft_set *set)
5991 struct nft_trans *trans;
5993 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5997 nft_trans_elem_set(trans) = set;
6001 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6002 const struct nft_set *set,
6003 const struct nlattr *attr)
6005 struct nft_expr *expr;
6008 expr = nft_expr_init(ctx, attr);
6013 if (expr->ops->type->flags & NFT_EXPR_GC) {
6014 if (set->flags & NFT_SET_TIMEOUT)
6015 goto err_set_elem_expr;
6016 if (!set->ops->gc_init)
6017 goto err_set_elem_expr;
6018 set->ops->gc_init(set);
6024 nft_expr_destroy(ctx, expr);
6025 return ERR_PTR(err);
6028 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6030 len += nft_set_ext_types[id].len;
6031 if (len > tmpl->ext_len[id] ||
6038 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6039 void *to, const void *from, u32 len)
6041 if (nft_set_ext_check(tmpl, id, len) < 0)
6044 memcpy(to, from, len);
6049 void *nft_set_elem_init(const struct nft_set *set,
6050 const struct nft_set_ext_tmpl *tmpl,
6051 const u32 *key, const u32 *key_end,
6052 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
6054 struct nft_set_ext *ext;
6057 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6059 return ERR_PTR(-ENOMEM);
6061 ext = nft_set_elem_ext(set, elem);
6062 nft_set_ext_init(ext, tmpl);
6064 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6065 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6066 nft_set_ext_key(ext), key, set->klen) < 0)
6069 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6070 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6071 nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6074 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6075 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6076 nft_set_ext_data(ext), data, set->dlen) < 0)
6079 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6080 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6081 if (expiration == 0)
6082 *nft_set_ext_expiration(ext) += timeout;
6084 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6085 *nft_set_ext_timeout(ext) = timeout;
6092 return ERR_PTR(-EINVAL);
6095 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6096 struct nft_expr *expr)
6098 if (expr->ops->destroy_clone) {
6099 expr->ops->destroy_clone(ctx, expr);
6100 module_put(expr->ops->type->owner);
6102 nf_tables_expr_destroy(ctx, expr);
6106 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6107 struct nft_set_elem_expr *elem_expr)
6109 struct nft_expr *expr;
6112 nft_setelem_expr_foreach(expr, elem_expr, size)
6113 __nft_set_elem_expr_destroy(ctx, expr);
6116 /* Drop references and destroy. Called from gc, dynset and abort path. */
6117 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
6120 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6121 struct nft_ctx ctx = {
6122 .net = read_pnet(&set->net),
6123 .family = set->table->family,
6126 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6127 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6128 nft_data_release(nft_set_ext_data(ext), set->dtype);
6129 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6130 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6132 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6133 (*nft_set_ext_obj(ext))->use--;
6136 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6138 /* Destroy element. References have been already dropped in the preparation
6139 * path via nft_setelem_data_deactivate().
6141 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6142 const struct nft_set *set, void *elem)
6144 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6146 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6147 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6152 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6153 struct nft_expr *expr_array[])
6155 struct nft_expr *expr;
6158 for (i = 0; i < set->num_exprs; i++) {
6159 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6163 err = nft_expr_clone(expr, set->exprs[i]);
6168 expr_array[i] = expr;
6174 for (k = i - 1; k >= 0; k--)
6175 nft_expr_destroy(ctx, expr_array[k]);
6180 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6181 const struct nft_set_ext_tmpl *tmpl,
6182 const struct nft_set_ext *ext,
6183 struct nft_expr *expr_array[],
6186 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6187 u32 len = sizeof(struct nft_set_elem_expr);
6188 struct nft_expr *expr;
6194 for (i = 0; i < num_exprs; i++)
6195 len += expr_array[i]->ops->size;
6197 if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6200 for (i = 0; i < num_exprs; i++) {
6201 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6202 err = nft_expr_clone(expr, expr_array[i]);
6204 goto err_elem_expr_setup;
6206 elem_expr->size += expr_array[i]->ops->size;
6207 nft_expr_destroy(ctx, expr_array[i]);
6208 expr_array[i] = NULL;
6213 err_elem_expr_setup:
6214 for (; i < num_exprs; i++) {
6215 nft_expr_destroy(ctx, expr_array[i]);
6216 expr_array[i] = NULL;
6222 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6223 const struct nft_set *set)
6225 struct nft_set_elem_catchall *catchall;
6226 u8 genmask = nft_genmask_cur(net);
6227 struct nft_set_ext *ext;
6229 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6230 ext = nft_set_elem_ext(set, catchall->elem);
6231 if (nft_set_elem_active(ext, genmask) &&
6232 !nft_set_elem_expired(ext))
6238 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6240 void *nft_set_catchall_gc(const struct nft_set *set)
6242 struct nft_set_elem_catchall *catchall, *next;
6243 struct nft_set_ext *ext;
6246 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6247 ext = nft_set_elem_ext(set, catchall->elem);
6249 if (!nft_set_elem_expired(ext) ||
6250 nft_set_elem_mark_busy(ext))
6253 elem = catchall->elem;
6254 list_del_rcu(&catchall->list);
6255 kfree_rcu(catchall, rcu);
6261 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
6263 static int nft_setelem_catchall_insert(const struct net *net,
6264 struct nft_set *set,
6265 const struct nft_set_elem *elem,
6266 struct nft_set_ext **pext)
6268 struct nft_set_elem_catchall *catchall;
6269 u8 genmask = nft_genmask_next(net);
6270 struct nft_set_ext *ext;
6272 list_for_each_entry(catchall, &set->catchall_list, list) {
6273 ext = nft_set_elem_ext(set, catchall->elem);
6274 if (nft_set_elem_active(ext, genmask)) {
6280 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6284 catchall->elem = elem->priv;
6285 list_add_tail_rcu(&catchall->list, &set->catchall_list);
6290 static int nft_setelem_insert(const struct net *net,
6291 struct nft_set *set,
6292 const struct nft_set_elem *elem,
6293 struct nft_set_ext **ext, unsigned int flags)
6297 if (flags & NFT_SET_ELEM_CATCHALL)
6298 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6300 ret = set->ops->insert(net, set, elem, ext);
6305 static bool nft_setelem_is_catchall(const struct nft_set *set,
6306 const struct nft_set_elem *elem)
6308 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6310 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6311 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6317 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6318 struct nft_set_elem *elem)
6320 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6322 if (nft_setelem_is_catchall(set, elem)) {
6323 nft_set_elem_change_active(net, set, ext);
6324 nft_set_elem_clear_busy(ext);
6326 set->ops->activate(net, set, elem);
6330 static int nft_setelem_catchall_deactivate(const struct net *net,
6331 struct nft_set *set,
6332 struct nft_set_elem *elem)
6334 struct nft_set_elem_catchall *catchall;
6335 struct nft_set_ext *ext;
6337 list_for_each_entry(catchall, &set->catchall_list, list) {
6338 ext = nft_set_elem_ext(set, catchall->elem);
6339 if (!nft_is_active(net, ext) ||
6340 nft_set_elem_mark_busy(ext))
6344 elem->priv = catchall->elem;
6345 nft_set_elem_change_active(net, set, ext);
6352 static int __nft_setelem_deactivate(const struct net *net,
6353 struct nft_set *set,
6354 struct nft_set_elem *elem)
6358 priv = set->ops->deactivate(net, set, elem);
6369 static int nft_setelem_deactivate(const struct net *net,
6370 struct nft_set *set,
6371 struct nft_set_elem *elem, u32 flags)
6375 if (flags & NFT_SET_ELEM_CATCHALL)
6376 ret = nft_setelem_catchall_deactivate(net, set, elem);
6378 ret = __nft_setelem_deactivate(net, set, elem);
6383 static void nft_setelem_catchall_remove(const struct net *net,
6384 const struct nft_set *set,
6385 const struct nft_set_elem *elem)
6387 struct nft_set_elem_catchall *catchall, *next;
6389 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6390 if (catchall->elem == elem->priv) {
6391 list_del_rcu(&catchall->list);
6392 kfree_rcu(catchall, rcu);
6398 static void nft_setelem_remove(const struct net *net,
6399 const struct nft_set *set,
6400 const struct nft_set_elem *elem)
6402 if (nft_setelem_is_catchall(set, elem))
6403 nft_setelem_catchall_remove(net, set, elem);
6405 set->ops->remove(net, set, elem);
6408 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6409 struct nlattr **nla, u32 flags)
6411 if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6412 (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6413 if (flags & NFT_SET_ELEM_INTERVAL_END)
6416 if (nla[NFTA_SET_ELEM_KEY_END] &&
6417 flags & NFT_SET_ELEM_CATCHALL)
6420 if (nla[NFTA_SET_ELEM_KEY_END])
6427 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6428 const struct nlattr *attr, u32 nlmsg_flags)
6430 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6431 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6432 u8 genmask = nft_genmask_next(ctx->net);
6433 u32 flags = 0, size = 0, num_exprs = 0;
6434 struct nft_set_ext_tmpl tmpl;
6435 struct nft_set_ext *ext, *ext2;
6436 struct nft_set_elem elem;
6437 struct nft_set_binding *binding;
6438 struct nft_object *obj = NULL;
6439 struct nft_userdata *udata;
6440 struct nft_data_desc desc;
6441 enum nft_registers dreg;
6442 struct nft_trans *trans;
6448 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6449 nft_set_elem_policy, NULL);
6453 nft_set_ext_prepare(&tmpl);
6455 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6459 if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6460 (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6464 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6469 if (set->flags & NFT_SET_MAP) {
6470 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6471 !(flags & NFT_SET_ELEM_INTERVAL_END))
6474 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6478 if (set->flags & NFT_SET_OBJECT) {
6479 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6480 !(flags & NFT_SET_ELEM_INTERVAL_END))
6483 if (nla[NFTA_SET_ELEM_OBJREF])
6487 if (!nft_setelem_valid_key_end(set, nla, flags))
6490 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6491 (nla[NFTA_SET_ELEM_DATA] ||
6492 nla[NFTA_SET_ELEM_OBJREF] ||
6493 nla[NFTA_SET_ELEM_TIMEOUT] ||
6494 nla[NFTA_SET_ELEM_EXPIRATION] ||
6495 nla[NFTA_SET_ELEM_USERDATA] ||
6496 nla[NFTA_SET_ELEM_EXPR] ||
6497 nla[NFTA_SET_ELEM_KEY_END] ||
6498 nla[NFTA_SET_ELEM_EXPRESSIONS]))
6502 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6503 if (!(set->flags & NFT_SET_TIMEOUT))
6505 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6509 } else if (set->flags & NFT_SET_TIMEOUT &&
6510 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6511 timeout = READ_ONCE(set->timeout);
6515 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6516 if (!(set->flags & NFT_SET_TIMEOUT))
6518 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6524 if (nla[NFTA_SET_ELEM_EXPR]) {
6525 struct nft_expr *expr;
6527 if (set->num_exprs && set->num_exprs != 1)
6530 expr = nft_set_elem_expr_alloc(ctx, set,
6531 nla[NFTA_SET_ELEM_EXPR]);
6533 return PTR_ERR(expr);
6535 expr_array[0] = expr;
6538 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6540 goto err_set_elem_expr;
6542 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6543 struct nft_expr *expr;
6548 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6549 if (i == NFT_SET_EXPR_MAX ||
6550 (set->num_exprs && set->num_exprs == i)) {
6552 goto err_set_elem_expr;
6554 if (nla_type(tmp) != NFTA_LIST_ELEM) {
6556 goto err_set_elem_expr;
6558 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6560 err = PTR_ERR(expr);
6561 goto err_set_elem_expr;
6563 expr_array[i] = expr;
6566 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6568 goto err_set_elem_expr;
6572 if (set->num_exprs && set->num_exprs != i) {
6574 goto err_set_elem_expr;
6576 } else if (set->num_exprs > 0 &&
6577 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6578 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6580 goto err_set_elem_expr_clone;
6582 num_exprs = set->num_exprs;
6585 if (nla[NFTA_SET_ELEM_KEY]) {
6586 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6587 nla[NFTA_SET_ELEM_KEY]);
6589 goto err_set_elem_expr;
6591 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6596 if (nla[NFTA_SET_ELEM_KEY_END]) {
6597 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6598 nla[NFTA_SET_ELEM_KEY_END]);
6602 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6604 goto err_parse_key_end;
6608 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6610 goto err_parse_key_end;
6612 if (timeout != READ_ONCE(set->timeout)) {
6613 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6615 goto err_parse_key_end;
6620 for (i = 0; i < num_exprs; i++)
6621 size += expr_array[i]->ops->size;
6623 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6624 sizeof(struct nft_set_elem_expr) + size);
6626 goto err_parse_key_end;
6629 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6630 obj = nft_obj_lookup(ctx->net, ctx->table,
6631 nla[NFTA_SET_ELEM_OBJREF],
6632 set->objtype, genmask);
6635 goto err_parse_key_end;
6637 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6639 goto err_parse_key_end;
6642 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6643 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6644 nla[NFTA_SET_ELEM_DATA]);
6646 goto err_parse_key_end;
6648 dreg = nft_type_to_reg(set->dtype);
6649 list_for_each_entry(binding, &set->bindings, list) {
6650 struct nft_ctx bind_ctx = {
6652 .family = ctx->family,
6653 .table = ctx->table,
6654 .chain = (struct nft_chain *)binding->chain,
6657 if (!(binding->flags & NFT_SET_MAP))
6660 err = nft_validate_register_store(&bind_ctx, dreg,
6662 desc.type, desc.len);
6664 goto err_parse_data;
6666 if (desc.type == NFT_DATA_VERDICT &&
6667 (elem.data.val.verdict.code == NFT_GOTO ||
6668 elem.data.val.verdict.code == NFT_JUMP))
6669 nft_validate_state_update(ctx->table,
6673 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6675 goto err_parse_data;
6678 /* The full maximum length of userdata can exceed the maximum
6679 * offset value (U8_MAX) for following extensions, therefor it
6680 * must be the last extension added.
6683 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6684 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6686 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6689 goto err_parse_data;
6693 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6694 elem.key_end.val.data, elem.data.val.data,
6695 timeout, expiration, GFP_KERNEL_ACCOUNT);
6696 if (IS_ERR(elem.priv)) {
6697 err = PTR_ERR(elem.priv);
6698 goto err_parse_data;
6701 ext = nft_set_elem_ext(set, elem.priv);
6703 *nft_set_ext_flags(ext) = flags;
6706 *nft_set_ext_obj(ext) = obj;
6710 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6714 udata = nft_set_ext_userdata(ext);
6715 udata->len = ulen - 1;
6716 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6718 err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6722 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6723 if (trans == NULL) {
6728 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6730 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6732 if (err == -EEXIST) {
6733 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6734 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6735 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6736 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6737 goto err_element_clash;
6738 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6739 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6740 memcmp(nft_set_ext_data(ext),
6741 nft_set_ext_data(ext2), set->dlen) != 0) ||
6742 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6743 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6744 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6745 goto err_element_clash;
6746 else if (!(nlmsg_flags & NLM_F_EXCL))
6748 } else if (err == -ENOTEMPTY) {
6749 /* ENOTEMPTY reports overlapping between this element
6750 * and an existing one.
6754 goto err_element_clash;
6757 if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6758 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6763 nft_trans_elem(trans) = elem;
6764 nft_trans_commit_list_add_tail(ctx->net, trans);
6768 nft_setelem_remove(ctx->net, set, &elem);
6772 nft_set_elem_destroy(set, elem.priv, true);
6774 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6775 nft_data_release(&elem.data.val, desc.type);
6777 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6779 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6781 for (i = 0; i < num_exprs && expr_array[i]; i++)
6782 nft_expr_destroy(ctx, expr_array[i]);
6783 err_set_elem_expr_clone:
6787 static int nf_tables_newsetelem(struct sk_buff *skb,
6788 const struct nfnl_info *info,
6789 const struct nlattr * const nla[])
6791 struct netlink_ext_ack *extack = info->extack;
6792 u8 genmask = nft_genmask_next(info->net);
6793 u8 family = info->nfmsg->nfgen_family;
6794 struct net *net = info->net;
6795 const struct nlattr *attr;
6796 struct nft_table *table;
6797 struct nft_set *set;
6801 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6804 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6805 genmask, NETLINK_CB(skb).portid);
6806 if (IS_ERR(table)) {
6807 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6808 return PTR_ERR(table);
6811 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6812 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6814 return PTR_ERR(set);
6816 if (!list_empty(&set->bindings) &&
6817 (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
6820 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6822 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6823 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6825 NL_SET_BAD_ATTR(extack, attr);
6830 if (table->validate_state == NFT_VALIDATE_DO)
6831 return nft_table_validate(net, table);
6837 * nft_data_hold - hold a nft_data item
6839 * @data: struct nft_data to release
6840 * @type: type of data
6842 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6843 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6844 * NFT_GOTO verdicts. This function must be called on active data objects
6845 * from the second phase of the commit protocol.
6847 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6849 struct nft_chain *chain;
6851 if (type == NFT_DATA_VERDICT) {
6852 switch (data->verdict.code) {
6855 chain = data->verdict.chain;
6862 static void nft_setelem_data_activate(const struct net *net,
6863 const struct nft_set *set,
6864 struct nft_set_elem *elem)
6866 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6868 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6869 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6870 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6871 (*nft_set_ext_obj(ext))->use++;
6874 static void nft_setelem_data_deactivate(const struct net *net,
6875 const struct nft_set *set,
6876 struct nft_set_elem *elem)
6878 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6880 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6881 nft_data_release(nft_set_ext_data(ext), set->dtype);
6882 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6883 (*nft_set_ext_obj(ext))->use--;
6886 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6887 const struct nlattr *attr)
6889 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6890 struct nft_set_ext_tmpl tmpl;
6891 struct nft_set_elem elem;
6892 struct nft_set_ext *ext;
6893 struct nft_trans *trans;
6897 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6898 nft_set_elem_policy, NULL);
6902 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6906 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6909 if (!nft_setelem_valid_key_end(set, nla, flags))
6912 nft_set_ext_prepare(&tmpl);
6915 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6920 if (nla[NFTA_SET_ELEM_KEY]) {
6921 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6922 nla[NFTA_SET_ELEM_KEY]);
6926 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6931 if (nla[NFTA_SET_ELEM_KEY_END]) {
6932 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6933 nla[NFTA_SET_ELEM_KEY_END]);
6937 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6939 goto fail_elem_key_end;
6943 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6944 elem.key_end.val.data, NULL, 0, 0,
6945 GFP_KERNEL_ACCOUNT);
6946 if (IS_ERR(elem.priv)) {
6947 err = PTR_ERR(elem.priv);
6948 goto fail_elem_key_end;
6951 ext = nft_set_elem_ext(set, elem.priv);
6953 *nft_set_ext_flags(ext) = flags;
6955 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6959 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6963 nft_setelem_data_deactivate(ctx->net, set, &elem);
6965 nft_trans_elem(trans) = elem;
6966 nft_trans_commit_list_add_tail(ctx->net, trans);
6974 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6976 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6980 static int nft_setelem_flush(const struct nft_ctx *ctx,
6981 struct nft_set *set,
6982 const struct nft_set_iter *iter,
6983 struct nft_set_elem *elem)
6985 struct nft_trans *trans;
6988 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6989 sizeof(struct nft_trans_elem), GFP_ATOMIC);
6993 if (!set->ops->flush(ctx->net, set, elem->priv)) {
6999 nft_setelem_data_deactivate(ctx->net, set, elem);
7000 nft_trans_elem_set(trans) = set;
7001 nft_trans_elem(trans) = *elem;
7002 nft_trans_commit_list_add_tail(ctx->net, trans);
7010 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7011 struct nft_set *set,
7012 struct nft_set_elem *elem)
7014 struct nft_trans *trans;
7016 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7017 sizeof(struct nft_trans_elem), GFP_KERNEL);
7021 nft_setelem_data_deactivate(ctx->net, set, elem);
7022 nft_trans_elem_set(trans) = set;
7023 nft_trans_elem(trans) = *elem;
7024 nft_trans_commit_list_add_tail(ctx->net, trans);
7029 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7030 struct nft_set *set)
7032 u8 genmask = nft_genmask_next(ctx->net);
7033 struct nft_set_elem_catchall *catchall;
7034 struct nft_set_elem elem;
7035 struct nft_set_ext *ext;
7038 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7039 ext = nft_set_elem_ext(set, catchall->elem);
7040 if (!nft_set_elem_active(ext, genmask) ||
7041 nft_set_elem_mark_busy(ext))
7044 elem.priv = catchall->elem;
7045 ret = __nft_set_catchall_flush(ctx, set, &elem);
7053 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7055 struct nft_set_iter iter = {
7057 .fn = nft_setelem_flush,
7060 set->ops->walk(ctx, set, &iter);
7062 iter.err = nft_set_catchall_flush(ctx, set);
7067 static int nf_tables_delsetelem(struct sk_buff *skb,
7068 const struct nfnl_info *info,
7069 const struct nlattr * const nla[])
7071 struct netlink_ext_ack *extack = info->extack;
7072 u8 genmask = nft_genmask_next(info->net);
7073 u8 family = info->nfmsg->nfgen_family;
7074 struct net *net = info->net;
7075 const struct nlattr *attr;
7076 struct nft_table *table;
7077 struct nft_set *set;
7081 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7082 genmask, NETLINK_CB(skb).portid);
7083 if (IS_ERR(table)) {
7084 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7085 return PTR_ERR(table);
7088 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7090 return PTR_ERR(set);
7092 if (!list_empty(&set->bindings) &&
7093 (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
7096 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7098 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7099 return nft_set_flush(&ctx, set, genmask);
7101 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7102 err = nft_del_setelem(&ctx, set, attr);
7103 if (err == -ENOENT &&
7104 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7108 NL_SET_BAD_ATTR(extack, attr);
7115 void nft_set_gc_batch_release(struct rcu_head *rcu)
7117 struct nft_set_gc_batch *gcb;
7120 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
7121 for (i = 0; i < gcb->head.cnt; i++)
7122 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
7126 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
7129 struct nft_set_gc_batch *gcb;
7131 gcb = kzalloc(sizeof(*gcb), gfp);
7134 gcb->head.set = set;
7143 * nft_register_obj- register nf_tables stateful object type
7144 * @obj_type: object type
7146 * Registers the object type for use with nf_tables. Returns zero on
7147 * success or a negative errno code otherwise.
7149 int nft_register_obj(struct nft_object_type *obj_type)
7151 if (obj_type->type == NFT_OBJECT_UNSPEC)
7154 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7155 list_add_rcu(&obj_type->list, &nf_tables_objects);
7156 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7159 EXPORT_SYMBOL_GPL(nft_register_obj);
7162 * nft_unregister_obj - unregister nf_tables object type
7163 * @obj_type: object type
7165 * Unregisters the object type for use with nf_tables.
7167 void nft_unregister_obj(struct nft_object_type *obj_type)
7169 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7170 list_del_rcu(&obj_type->list);
7171 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7173 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7175 struct nft_object *nft_obj_lookup(const struct net *net,
7176 const struct nft_table *table,
7177 const struct nlattr *nla, u32 objtype,
7180 struct nft_object_hash_key k = { .table = table };
7181 char search[NFT_OBJ_MAXNAMELEN];
7182 struct rhlist_head *tmp, *list;
7183 struct nft_object *obj;
7185 nla_strscpy(search, nla, sizeof(search));
7188 WARN_ON_ONCE(!rcu_read_lock_held() &&
7189 !lockdep_commit_lock_is_held(net));
7192 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7196 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7197 if (objtype == obj->ops->type->type &&
7198 nft_active_genmask(obj, genmask)) {
7205 return ERR_PTR(-ENOENT);
7207 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7209 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7210 const struct nlattr *nla,
7211 u32 objtype, u8 genmask)
7213 struct nft_object *obj;
7215 list_for_each_entry(obj, &table->objects, list) {
7216 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7217 objtype == obj->ops->type->type &&
7218 nft_active_genmask(obj, genmask))
7221 return ERR_PTR(-ENOENT);
7224 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7225 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
7226 .len = NFT_TABLE_MAXNAMELEN - 1 },
7227 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
7228 .len = NFT_OBJ_MAXNAMELEN - 1 },
7229 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
7230 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
7231 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
7232 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
7233 .len = NFT_USERDATA_MAXLEN },
7236 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7237 const struct nft_object_type *type,
7238 const struct nlattr *attr)
7241 const struct nft_object_ops *ops;
7242 struct nft_object *obj;
7245 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7250 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7251 type->policy, NULL);
7255 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7258 if (type->select_ops) {
7259 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7269 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7273 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7286 return ERR_PTR(err);
7289 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7290 struct nft_object *obj, bool reset)
7292 struct nlattr *nest;
7294 nest = nla_nest_start_noflag(skb, attr);
7296 goto nla_put_failure;
7297 if (obj->ops->dump(skb, obj, reset) < 0)
7298 goto nla_put_failure;
7299 nla_nest_end(skb, nest);
7306 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
7308 const struct nft_object_type *type;
7310 list_for_each_entry(type, &nf_tables_objects, list) {
7311 if (objtype == type->type)
7317 static const struct nft_object_type *
7318 nft_obj_type_get(struct net *net, u32 objtype)
7320 const struct nft_object_type *type;
7322 type = __nft_obj_type_get(objtype);
7323 if (type != NULL && try_module_get(type->owner))
7326 lockdep_nfnl_nft_mutex_not_held();
7327 #ifdef CONFIG_MODULES
7329 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7330 return ERR_PTR(-EAGAIN);
7333 return ERR_PTR(-ENOENT);
7336 static int nf_tables_updobj(const struct nft_ctx *ctx,
7337 const struct nft_object_type *type,
7338 const struct nlattr *attr,
7339 struct nft_object *obj)
7341 struct nft_object *newobj;
7342 struct nft_trans *trans;
7345 if (!try_module_get(type->owner))
7348 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7349 sizeof(struct nft_trans_obj));
7353 newobj = nft_obj_init(ctx, type, attr);
7354 if (IS_ERR(newobj)) {
7355 err = PTR_ERR(newobj);
7356 goto err_free_trans;
7359 nft_trans_obj(trans) = obj;
7360 nft_trans_obj_update(trans) = true;
7361 nft_trans_obj_newobj(trans) = newobj;
7362 nft_trans_commit_list_add_tail(ctx->net, trans);
7369 module_put(type->owner);
7373 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7374 const struct nlattr * const nla[])
7376 struct netlink_ext_ack *extack = info->extack;
7377 u8 genmask = nft_genmask_next(info->net);
7378 u8 family = info->nfmsg->nfgen_family;
7379 const struct nft_object_type *type;
7380 struct net *net = info->net;
7381 struct nft_table *table;
7382 struct nft_object *obj;
7387 if (!nla[NFTA_OBJ_TYPE] ||
7388 !nla[NFTA_OBJ_NAME] ||
7389 !nla[NFTA_OBJ_DATA])
7392 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7393 NETLINK_CB(skb).portid);
7394 if (IS_ERR(table)) {
7395 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7396 return PTR_ERR(table);
7399 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7400 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7403 if (err != -ENOENT) {
7404 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7408 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7409 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7412 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7415 type = __nft_obj_type_get(objtype);
7416 if (WARN_ON_ONCE(!type))
7419 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7421 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7424 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7426 type = nft_obj_type_get(net, objtype);
7428 return PTR_ERR(type);
7430 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7435 obj->key.table = table;
7436 obj->handle = nf_tables_alloc_handle(table);
7438 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7439 if (!obj->key.name) {
7444 if (nla[NFTA_OBJ_USERDATA]) {
7445 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7446 if (obj->udata == NULL)
7449 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7452 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7456 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7457 nft_objname_ht_params);
7461 list_add_tail_rcu(&obj->list, &table->objects);
7465 /* queued in transaction log */
7466 INIT_LIST_HEAD(&obj->list);
7471 kfree(obj->key.name);
7473 if (obj->ops->destroy)
7474 obj->ops->destroy(&ctx, obj);
7477 module_put(type->owner);
7481 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7482 u32 portid, u32 seq, int event, u32 flags,
7483 int family, const struct nft_table *table,
7484 struct nft_object *obj, bool reset)
7486 struct nlmsghdr *nlh;
7488 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7489 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7490 NFNETLINK_V0, nft_base_seq(net));
7492 goto nla_put_failure;
7494 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7495 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7496 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7498 goto nla_put_failure;
7500 if (event == NFT_MSG_DELOBJ) {
7501 nlmsg_end(skb, nlh);
7505 if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7506 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7507 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7508 goto nla_put_failure;
7511 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7512 goto nla_put_failure;
7514 nlmsg_end(skb, nlh);
7518 nlmsg_trim(skb, nlh);
7522 struct nft_obj_filter {
7527 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7529 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7530 const struct nft_table *table;
7531 unsigned int idx = 0, s_idx = cb->args[0];
7532 struct nft_obj_filter *filter = cb->data;
7533 struct net *net = sock_net(skb->sk);
7534 int family = nfmsg->nfgen_family;
7535 struct nftables_pernet *nft_net;
7536 struct nft_object *obj;
7539 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7543 nft_net = nft_pernet(net);
7544 cb->seq = READ_ONCE(nft_net->base_seq);
7546 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7547 if (family != NFPROTO_UNSPEC && family != table->family)
7550 list_for_each_entry_rcu(obj, &table->objects, list) {
7551 if (!nft_is_active(net, obj))
7556 memset(&cb->args[1], 0,
7557 sizeof(cb->args) - sizeof(cb->args[0]));
7558 if (filter && filter->table &&
7559 strcmp(filter->table, table->name))
7562 filter->type != NFT_OBJECT_UNSPEC &&
7563 obj->ops->type->type != filter->type)
7566 char *buf = kasprintf(GFP_ATOMIC,
7571 audit_log_nfcfg(buf,
7574 AUDIT_NFT_OP_OBJ_RESET,
7579 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7582 NLM_F_MULTI | NLM_F_APPEND,
7583 table->family, table,
7587 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7599 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7601 const struct nlattr * const *nla = cb->data;
7602 struct nft_obj_filter *filter = NULL;
7604 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7605 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7609 if (nla[NFTA_OBJ_TABLE]) {
7610 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7611 if (!filter->table) {
7617 if (nla[NFTA_OBJ_TYPE])
7618 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7625 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7627 struct nft_obj_filter *filter = cb->data;
7630 kfree(filter->table);
7637 /* called with rcu_read_lock held */
7638 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7639 const struct nlattr * const nla[])
7641 struct netlink_ext_ack *extack = info->extack;
7642 u8 genmask = nft_genmask_cur(info->net);
7643 u8 family = info->nfmsg->nfgen_family;
7644 const struct nft_table *table;
7645 struct net *net = info->net;
7646 struct nft_object *obj;
7647 struct sk_buff *skb2;
7652 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7653 struct netlink_dump_control c = {
7654 .start = nf_tables_dump_obj_start,
7655 .dump = nf_tables_dump_obj,
7656 .done = nf_tables_dump_obj_done,
7657 .module = THIS_MODULE,
7658 .data = (void *)nla,
7661 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7664 if (!nla[NFTA_OBJ_NAME] ||
7665 !nla[NFTA_OBJ_TYPE])
7668 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7669 if (IS_ERR(table)) {
7670 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7671 return PTR_ERR(table);
7674 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7675 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7677 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7678 return PTR_ERR(obj);
7681 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7685 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7689 const struct nftables_pernet *nft_net;
7692 nft_net = nft_pernet(net);
7693 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7695 audit_log_nfcfg(buf,
7698 AUDIT_NFT_OP_OBJ_RESET,
7703 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7704 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7705 family, table, obj, reset);
7707 goto err_fill_obj_info;
7709 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7716 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7718 if (obj->ops->destroy)
7719 obj->ops->destroy(ctx, obj);
7721 module_put(obj->ops->type->owner);
7722 kfree(obj->key.name);
7727 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7728 const struct nlattr * const nla[])
7730 struct netlink_ext_ack *extack = info->extack;
7731 u8 genmask = nft_genmask_next(info->net);
7732 u8 family = info->nfmsg->nfgen_family;
7733 struct net *net = info->net;
7734 const struct nlattr *attr;
7735 struct nft_table *table;
7736 struct nft_object *obj;
7740 if (!nla[NFTA_OBJ_TYPE] ||
7741 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7744 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7745 NETLINK_CB(skb).portid);
7746 if (IS_ERR(table)) {
7747 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7748 return PTR_ERR(table);
7751 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7752 if (nla[NFTA_OBJ_HANDLE]) {
7753 attr = nla[NFTA_OBJ_HANDLE];
7754 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7756 attr = nla[NFTA_OBJ_NAME];
7757 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7761 if (PTR_ERR(obj) == -ENOENT &&
7762 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7765 NL_SET_BAD_ATTR(extack, attr);
7766 return PTR_ERR(obj);
7769 NL_SET_BAD_ATTR(extack, attr);
7773 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7775 return nft_delobj(&ctx, obj);
7778 void nft_obj_notify(struct net *net, const struct nft_table *table,
7779 struct nft_object *obj, u32 portid, u32 seq, int event,
7780 u16 flags, int family, int report, gfp_t gfp)
7782 struct nftables_pernet *nft_net = nft_pernet(net);
7783 struct sk_buff *skb;
7785 char *buf = kasprintf(gfp, "%s:%u",
7786 table->name, nft_net->base_seq);
7788 audit_log_nfcfg(buf,
7791 event == NFT_MSG_NEWOBJ ?
7792 AUDIT_NFT_OP_OBJ_REGISTER :
7793 AUDIT_NFT_OP_OBJ_UNREGISTER,
7798 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7801 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7805 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7806 flags & (NLM_F_CREATE | NLM_F_EXCL),
7807 family, table, obj, false);
7813 nft_notify_enqueue(skb, report, &nft_net->notify_list);
7816 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7818 EXPORT_SYMBOL_GPL(nft_obj_notify);
7820 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7821 struct nft_object *obj, int event)
7823 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7824 ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7830 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7832 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7833 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7834 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7836 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7838 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7840 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7841 list_del_rcu(&type->list);
7842 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7844 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7846 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7847 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
7848 .len = NFT_NAME_MAXLEN - 1 },
7849 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
7850 .len = NFT_NAME_MAXLEN - 1 },
7851 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
7852 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
7853 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
7856 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7857 const struct nlattr *nla, u8 genmask)
7859 struct nft_flowtable *flowtable;
7861 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7862 if (!nla_strcmp(nla, flowtable->name) &&
7863 nft_active_genmask(flowtable, genmask))
7866 return ERR_PTR(-ENOENT);
7868 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7870 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7871 struct nft_flowtable *flowtable,
7872 enum nft_trans_phase phase)
7875 case NFT_TRANS_PREPARE_ERROR:
7876 case NFT_TRANS_PREPARE:
7877 case NFT_TRANS_ABORT:
7878 case NFT_TRANS_RELEASE:
7885 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7887 static struct nft_flowtable *
7888 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7889 const struct nlattr *nla, u8 genmask)
7891 struct nft_flowtable *flowtable;
7893 list_for_each_entry(flowtable, &table->flowtables, list) {
7894 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7895 nft_active_genmask(flowtable, genmask))
7898 return ERR_PTR(-ENOENT);
7901 struct nft_flowtable_hook {
7904 struct list_head list;
7907 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7908 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
7909 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
7910 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
7913 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7914 const struct nlattr * const nla[],
7915 struct nft_flowtable_hook *flowtable_hook,
7916 struct nft_flowtable *flowtable,
7917 struct netlink_ext_ack *extack, bool add)
7919 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7920 struct nft_hook *hook;
7921 int hooknum, priority;
7924 INIT_LIST_HEAD(&flowtable_hook->list);
7926 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
7927 nla[NFTA_FLOWTABLE_HOOK],
7928 nft_flowtable_hook_policy, NULL);
7933 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7934 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7935 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7939 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7940 if (hooknum != NF_NETDEV_INGRESS)
7943 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7945 flowtable_hook->priority = priority;
7946 flowtable_hook->num = hooknum;
7948 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7949 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7950 if (hooknum != flowtable->hooknum)
7954 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7955 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7956 if (priority != flowtable->data.priority)
7960 flowtable_hook->priority = flowtable->data.priority;
7961 flowtable_hook->num = flowtable->hooknum;
7964 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7965 err = nf_tables_parse_netdev_hooks(ctx->net,
7966 tb[NFTA_FLOWTABLE_HOOK_DEVS],
7967 &flowtable_hook->list,
7973 list_for_each_entry(hook, &flowtable_hook->list, list) {
7974 hook->ops.pf = NFPROTO_NETDEV;
7975 hook->ops.hooknum = flowtable_hook->num;
7976 hook->ops.priority = flowtable_hook->priority;
7977 hook->ops.priv = &flowtable->data;
7978 hook->ops.hook = flowtable->data.type->hook;
7984 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7986 const struct nf_flowtable_type *type;
7988 list_for_each_entry(type, &nf_tables_flowtables, list) {
7989 if (family == type->family)
7995 static const struct nf_flowtable_type *
7996 nft_flowtable_type_get(struct net *net, u8 family)
7998 const struct nf_flowtable_type *type;
8000 type = __nft_flowtable_type_get(family);
8001 if (type != NULL && try_module_get(type->owner))
8004 lockdep_nfnl_nft_mutex_not_held();
8005 #ifdef CONFIG_MODULES
8007 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8008 return ERR_PTR(-EAGAIN);
8011 return ERR_PTR(-ENOENT);
8014 /* Only called from error and netdev event paths. */
8015 static void nft_unregister_flowtable_hook(struct net *net,
8016 struct nft_flowtable *flowtable,
8017 struct nft_hook *hook)
8019 nf_unregister_net_hook(net, &hook->ops);
8020 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8024 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8025 struct list_head *hook_list,
8026 bool release_netdev)
8028 struct nft_hook *hook, *next;
8030 list_for_each_entry_safe(hook, next, hook_list, list) {
8031 nf_unregister_net_hook(net, &hook->ops);
8032 if (release_netdev) {
8033 list_del(&hook->list);
8034 kfree_rcu(hook, rcu);
8039 static void nft_unregister_flowtable_net_hooks(struct net *net,
8040 struct list_head *hook_list)
8042 __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8045 static int nft_register_flowtable_net_hooks(struct net *net,
8046 struct nft_table *table,
8047 struct list_head *hook_list,
8048 struct nft_flowtable *flowtable)
8050 struct nft_hook *hook, *hook2, *next;
8051 struct nft_flowtable *ft;
8054 list_for_each_entry(hook, hook_list, list) {
8055 list_for_each_entry(ft, &table->flowtables, list) {
8056 if (!nft_is_active_next(net, ft))
8059 list_for_each_entry(hook2, &ft->hook_list, list) {
8060 if (hook->ops.dev == hook2->ops.dev &&
8061 hook->ops.pf == hook2->ops.pf) {
8063 goto err_unregister_net_hooks;
8068 err = flowtable->data.type->setup(&flowtable->data,
8072 goto err_unregister_net_hooks;
8074 err = nf_register_net_hook(net, &hook->ops);
8076 flowtable->data.type->setup(&flowtable->data,
8079 goto err_unregister_net_hooks;
8087 err_unregister_net_hooks:
8088 list_for_each_entry_safe(hook, next, hook_list, list) {
8092 nft_unregister_flowtable_hook(net, flowtable, hook);
8093 list_del_rcu(&hook->list);
8094 kfree_rcu(hook, rcu);
8100 static void nft_hooks_destroy(struct list_head *hook_list)
8102 struct nft_hook *hook, *next;
8104 list_for_each_entry_safe(hook, next, hook_list, list) {
8105 list_del_rcu(&hook->list);
8106 kfree_rcu(hook, rcu);
8110 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8111 struct nft_flowtable *flowtable,
8112 struct netlink_ext_ack *extack)
8114 const struct nlattr * const *nla = ctx->nla;
8115 struct nft_flowtable_hook flowtable_hook;
8116 struct nft_hook *hook, *next;
8117 struct nft_trans *trans;
8118 bool unregister = false;
8122 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8127 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8128 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8129 list_del(&hook->list);
8134 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8135 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8136 if (flags & ~NFT_FLOWTABLE_MASK) {
8138 goto err_flowtable_update_hook;
8140 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8141 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8143 goto err_flowtable_update_hook;
8146 flags = flowtable->data.flags;
8149 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8150 &flowtable_hook.list, flowtable);
8152 goto err_flowtable_update_hook;
8154 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8155 sizeof(struct nft_trans_flowtable));
8159 goto err_flowtable_update_hook;
8162 nft_trans_flowtable_flags(trans) = flags;
8163 nft_trans_flowtable(trans) = flowtable;
8164 nft_trans_flowtable_update(trans) = true;
8165 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8166 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8168 nft_trans_commit_list_add_tail(ctx->net, trans);
8172 err_flowtable_update_hook:
8173 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8175 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8176 list_del_rcu(&hook->list);
8177 kfree_rcu(hook, rcu);
8184 static int nf_tables_newflowtable(struct sk_buff *skb,
8185 const struct nfnl_info *info,
8186 const struct nlattr * const nla[])
8188 struct netlink_ext_ack *extack = info->extack;
8189 struct nft_flowtable_hook flowtable_hook;
8190 u8 genmask = nft_genmask_next(info->net);
8191 u8 family = info->nfmsg->nfgen_family;
8192 const struct nf_flowtable_type *type;
8193 struct nft_flowtable *flowtable;
8194 struct nft_hook *hook, *next;
8195 struct net *net = info->net;
8196 struct nft_table *table;
8200 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8201 !nla[NFTA_FLOWTABLE_NAME] ||
8202 !nla[NFTA_FLOWTABLE_HOOK])
8205 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8206 genmask, NETLINK_CB(skb).portid);
8207 if (IS_ERR(table)) {
8208 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8209 return PTR_ERR(table);
8212 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8214 if (IS_ERR(flowtable)) {
8215 err = PTR_ERR(flowtable);
8216 if (err != -ENOENT) {
8217 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8221 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8222 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8226 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8228 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8231 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8233 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8237 flowtable->table = table;
8238 flowtable->handle = nf_tables_alloc_handle(table);
8239 INIT_LIST_HEAD(&flowtable->hook_list);
8241 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8242 if (!flowtable->name) {
8247 type = nft_flowtable_type_get(net, family);
8249 err = PTR_ERR(type);
8253 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8254 flowtable->data.flags =
8255 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8256 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8262 write_pnet(&flowtable->data.net, net);
8263 flowtable->data.type = type;
8264 err = type->init(&flowtable->data);
8268 err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8273 list_splice(&flowtable_hook.list, &flowtable->hook_list);
8274 flowtable->data.priority = flowtable_hook.priority;
8275 flowtable->hooknum = flowtable_hook.num;
8277 err = nft_register_flowtable_net_hooks(ctx.net, table,
8278 &flowtable->hook_list,
8281 nft_hooks_destroy(&flowtable->hook_list);
8285 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8289 list_add_tail_rcu(&flowtable->list, &table->flowtables);
8294 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8295 nft_unregister_flowtable_hook(net, flowtable, hook);
8296 list_del_rcu(&hook->list);
8297 kfree_rcu(hook, rcu);
8300 flowtable->data.type->free(&flowtable->data);
8302 module_put(type->owner);
8304 kfree(flowtable->name);
8310 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8312 struct nft_hook *this, *next;
8314 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8315 list_del(&this->list);
8320 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8321 struct nft_flowtable *flowtable,
8322 struct netlink_ext_ack *extack)
8324 const struct nlattr * const *nla = ctx->nla;
8325 struct nft_flowtable_hook flowtable_hook;
8326 LIST_HEAD(flowtable_del_list);
8327 struct nft_hook *this, *hook;
8328 struct nft_trans *trans;
8331 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8336 list_for_each_entry(this, &flowtable_hook.list, list) {
8337 hook = nft_hook_list_find(&flowtable->hook_list, this);
8340 goto err_flowtable_del_hook;
8342 list_move(&hook->list, &flowtable_del_list);
8345 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8346 sizeof(struct nft_trans_flowtable));
8349 goto err_flowtable_del_hook;
8352 nft_trans_flowtable(trans) = flowtable;
8353 nft_trans_flowtable_update(trans) = true;
8354 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8355 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8356 nft_flowtable_hook_release(&flowtable_hook);
8358 nft_trans_commit_list_add_tail(ctx->net, trans);
8362 err_flowtable_del_hook:
8363 list_splice(&flowtable_del_list, &flowtable->hook_list);
8364 nft_flowtable_hook_release(&flowtable_hook);
8369 static int nf_tables_delflowtable(struct sk_buff *skb,
8370 const struct nfnl_info *info,
8371 const struct nlattr * const nla[])
8373 struct netlink_ext_ack *extack = info->extack;
8374 u8 genmask = nft_genmask_next(info->net);
8375 u8 family = info->nfmsg->nfgen_family;
8376 struct nft_flowtable *flowtable;
8377 struct net *net = info->net;
8378 const struct nlattr *attr;
8379 struct nft_table *table;
8382 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8383 (!nla[NFTA_FLOWTABLE_NAME] &&
8384 !nla[NFTA_FLOWTABLE_HANDLE]))
8387 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8388 genmask, NETLINK_CB(skb).portid);
8389 if (IS_ERR(table)) {
8390 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8391 return PTR_ERR(table);
8394 if (nla[NFTA_FLOWTABLE_HANDLE]) {
8395 attr = nla[NFTA_FLOWTABLE_HANDLE];
8396 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8398 attr = nla[NFTA_FLOWTABLE_NAME];
8399 flowtable = nft_flowtable_lookup(table, attr, genmask);
8402 if (IS_ERR(flowtable)) {
8403 if (PTR_ERR(flowtable) == -ENOENT &&
8404 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8407 NL_SET_BAD_ATTR(extack, attr);
8408 return PTR_ERR(flowtable);
8411 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8413 if (nla[NFTA_FLOWTABLE_HOOK])
8414 return nft_delflowtable_hook(&ctx, flowtable, extack);
8416 if (flowtable->use > 0) {
8417 NL_SET_BAD_ATTR(extack, attr);
8421 return nft_delflowtable(&ctx, flowtable);
8424 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8425 u32 portid, u32 seq, int event,
8426 u32 flags, int family,
8427 struct nft_flowtable *flowtable,
8428 struct list_head *hook_list)
8430 struct nlattr *nest, *nest_devs;
8431 struct nft_hook *hook;
8432 struct nlmsghdr *nlh;
8434 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8435 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8436 NFNETLINK_V0, nft_base_seq(net));
8438 goto nla_put_failure;
8440 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8441 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8442 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8443 NFTA_FLOWTABLE_PAD))
8444 goto nla_put_failure;
8446 if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8447 nlmsg_end(skb, nlh);
8451 if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8452 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8453 goto nla_put_failure;
8455 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8457 goto nla_put_failure;
8458 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8459 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8460 goto nla_put_failure;
8462 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8464 goto nla_put_failure;
8467 hook_list = &flowtable->hook_list;
8469 list_for_each_entry_rcu(hook, hook_list, list) {
8470 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8471 goto nla_put_failure;
8473 nla_nest_end(skb, nest_devs);
8474 nla_nest_end(skb, nest);
8476 nlmsg_end(skb, nlh);
8480 nlmsg_trim(skb, nlh);
8484 struct nft_flowtable_filter {
8488 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8489 struct netlink_callback *cb)
8491 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8492 struct nft_flowtable_filter *filter = cb->data;
8493 unsigned int idx = 0, s_idx = cb->args[0];
8494 struct net *net = sock_net(skb->sk);
8495 int family = nfmsg->nfgen_family;
8496 struct nft_flowtable *flowtable;
8497 struct nftables_pernet *nft_net;
8498 const struct nft_table *table;
8501 nft_net = nft_pernet(net);
8502 cb->seq = READ_ONCE(nft_net->base_seq);
8504 list_for_each_entry_rcu(table, &nft_net->tables, list) {
8505 if (family != NFPROTO_UNSPEC && family != table->family)
8508 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8509 if (!nft_is_active(net, flowtable))
8514 memset(&cb->args[1], 0,
8515 sizeof(cb->args) - sizeof(cb->args[0]));
8516 if (filter && filter->table &&
8517 strcmp(filter->table, table->name))
8520 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8522 NFT_MSG_NEWFLOWTABLE,
8523 NLM_F_MULTI | NLM_F_APPEND,
8525 flowtable, NULL) < 0)
8528 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8540 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8542 const struct nlattr * const *nla = cb->data;
8543 struct nft_flowtable_filter *filter = NULL;
8545 if (nla[NFTA_FLOWTABLE_TABLE]) {
8546 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8550 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8552 if (!filter->table) {
8562 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8564 struct nft_flowtable_filter *filter = cb->data;
8569 kfree(filter->table);
8575 /* called with rcu_read_lock held */
8576 static int nf_tables_getflowtable(struct sk_buff *skb,
8577 const struct nfnl_info *info,
8578 const struct nlattr * const nla[])
8580 u8 genmask = nft_genmask_cur(info->net);
8581 u8 family = info->nfmsg->nfgen_family;
8582 struct nft_flowtable *flowtable;
8583 const struct nft_table *table;
8584 struct net *net = info->net;
8585 struct sk_buff *skb2;
8588 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8589 struct netlink_dump_control c = {
8590 .start = nf_tables_dump_flowtable_start,
8591 .dump = nf_tables_dump_flowtable,
8592 .done = nf_tables_dump_flowtable_done,
8593 .module = THIS_MODULE,
8594 .data = (void *)nla,
8597 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8600 if (!nla[NFTA_FLOWTABLE_NAME])
8603 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8606 return PTR_ERR(table);
8608 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8610 if (IS_ERR(flowtable))
8611 return PTR_ERR(flowtable);
8613 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8617 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8618 info->nlh->nlmsg_seq,
8619 NFT_MSG_NEWFLOWTABLE, 0, family,
8622 goto err_fill_flowtable_info;
8624 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8626 err_fill_flowtable_info:
8631 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8632 struct nft_flowtable *flowtable,
8633 struct list_head *hook_list, int event)
8635 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8636 struct sk_buff *skb;
8641 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8644 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8648 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8649 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8651 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8652 ctx->seq, event, flags,
8653 ctx->family, flowtable, hook_list);
8659 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8662 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8665 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8667 struct nft_hook *hook, *next;
8669 flowtable->data.type->free(&flowtable->data);
8670 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8671 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8673 list_del_rcu(&hook->list);
8676 kfree(flowtable->name);
8677 module_put(flowtable->data.type->owner);
8681 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8682 u32 portid, u32 seq)
8684 struct nftables_pernet *nft_net = nft_pernet(net);
8685 struct nlmsghdr *nlh;
8686 char buf[TASK_COMM_LEN];
8687 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8689 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8690 NFNETLINK_V0, nft_base_seq(net));
8692 goto nla_put_failure;
8694 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8695 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8696 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8697 goto nla_put_failure;
8699 nlmsg_end(skb, nlh);
8703 nlmsg_trim(skb, nlh);
8707 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8708 struct nft_flowtable *flowtable)
8710 struct nft_hook *hook;
8712 list_for_each_entry(hook, &flowtable->hook_list, list) {
8713 if (hook->ops.dev != dev)
8716 /* flow_offload_netdev_event() cleans up entries for us. */
8717 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8718 list_del_rcu(&hook->list);
8719 kfree_rcu(hook, rcu);
8724 static int nf_tables_flowtable_event(struct notifier_block *this,
8725 unsigned long event, void *ptr)
8727 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8728 struct nft_flowtable *flowtable;
8729 struct nftables_pernet *nft_net;
8730 struct nft_table *table;
8733 if (event != NETDEV_UNREGISTER)
8737 nft_net = nft_pernet(net);
8738 mutex_lock(&nft_net->commit_mutex);
8739 list_for_each_entry(table, &nft_net->tables, list) {
8740 list_for_each_entry(flowtable, &table->flowtables, list) {
8741 nft_flowtable_event(event, dev, flowtable);
8744 mutex_unlock(&nft_net->commit_mutex);
8749 static struct notifier_block nf_tables_flowtable_notifier = {
8750 .notifier_call = nf_tables_flowtable_event,
8753 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8756 struct nlmsghdr *nlh = nlmsg_hdr(skb);
8757 struct sk_buff *skb2;
8760 if (!nlmsg_report(nlh) &&
8761 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8764 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8768 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8775 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8776 nlmsg_report(nlh), GFP_KERNEL);
8779 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8783 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8784 const struct nlattr * const nla[])
8786 struct sk_buff *skb2;
8789 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8793 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8794 info->nlh->nlmsg_seq);
8796 goto err_fill_gen_info;
8798 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8805 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8806 [NFT_MSG_NEWTABLE] = {
8807 .call = nf_tables_newtable,
8808 .type = NFNL_CB_BATCH,
8809 .attr_count = NFTA_TABLE_MAX,
8810 .policy = nft_table_policy,
8812 [NFT_MSG_GETTABLE] = {
8813 .call = nf_tables_gettable,
8814 .type = NFNL_CB_RCU,
8815 .attr_count = NFTA_TABLE_MAX,
8816 .policy = nft_table_policy,
8818 [NFT_MSG_DELTABLE] = {
8819 .call = nf_tables_deltable,
8820 .type = NFNL_CB_BATCH,
8821 .attr_count = NFTA_TABLE_MAX,
8822 .policy = nft_table_policy,
8824 [NFT_MSG_DESTROYTABLE] = {
8825 .call = nf_tables_deltable,
8826 .type = NFNL_CB_BATCH,
8827 .attr_count = NFTA_TABLE_MAX,
8828 .policy = nft_table_policy,
8830 [NFT_MSG_NEWCHAIN] = {
8831 .call = nf_tables_newchain,
8832 .type = NFNL_CB_BATCH,
8833 .attr_count = NFTA_CHAIN_MAX,
8834 .policy = nft_chain_policy,
8836 [NFT_MSG_GETCHAIN] = {
8837 .call = nf_tables_getchain,
8838 .type = NFNL_CB_RCU,
8839 .attr_count = NFTA_CHAIN_MAX,
8840 .policy = nft_chain_policy,
8842 [NFT_MSG_DELCHAIN] = {
8843 .call = nf_tables_delchain,
8844 .type = NFNL_CB_BATCH,
8845 .attr_count = NFTA_CHAIN_MAX,
8846 .policy = nft_chain_policy,
8848 [NFT_MSG_DESTROYCHAIN] = {
8849 .call = nf_tables_delchain,
8850 .type = NFNL_CB_BATCH,
8851 .attr_count = NFTA_CHAIN_MAX,
8852 .policy = nft_chain_policy,
8854 [NFT_MSG_NEWRULE] = {
8855 .call = nf_tables_newrule,
8856 .type = NFNL_CB_BATCH,
8857 .attr_count = NFTA_RULE_MAX,
8858 .policy = nft_rule_policy,
8860 [NFT_MSG_GETRULE] = {
8861 .call = nf_tables_getrule,
8862 .type = NFNL_CB_RCU,
8863 .attr_count = NFTA_RULE_MAX,
8864 .policy = nft_rule_policy,
8866 [NFT_MSG_GETRULE_RESET] = {
8867 .call = nf_tables_getrule,
8868 .type = NFNL_CB_RCU,
8869 .attr_count = NFTA_RULE_MAX,
8870 .policy = nft_rule_policy,
8872 [NFT_MSG_DELRULE] = {
8873 .call = nf_tables_delrule,
8874 .type = NFNL_CB_BATCH,
8875 .attr_count = NFTA_RULE_MAX,
8876 .policy = nft_rule_policy,
8878 [NFT_MSG_DESTROYRULE] = {
8879 .call = nf_tables_delrule,
8880 .type = NFNL_CB_BATCH,
8881 .attr_count = NFTA_RULE_MAX,
8882 .policy = nft_rule_policy,
8884 [NFT_MSG_NEWSET] = {
8885 .call = nf_tables_newset,
8886 .type = NFNL_CB_BATCH,
8887 .attr_count = NFTA_SET_MAX,
8888 .policy = nft_set_policy,
8890 [NFT_MSG_GETSET] = {
8891 .call = nf_tables_getset,
8892 .type = NFNL_CB_RCU,
8893 .attr_count = NFTA_SET_MAX,
8894 .policy = nft_set_policy,
8896 [NFT_MSG_DELSET] = {
8897 .call = nf_tables_delset,
8898 .type = NFNL_CB_BATCH,
8899 .attr_count = NFTA_SET_MAX,
8900 .policy = nft_set_policy,
8902 [NFT_MSG_DESTROYSET] = {
8903 .call = nf_tables_delset,
8904 .type = NFNL_CB_BATCH,
8905 .attr_count = NFTA_SET_MAX,
8906 .policy = nft_set_policy,
8908 [NFT_MSG_NEWSETELEM] = {
8909 .call = nf_tables_newsetelem,
8910 .type = NFNL_CB_BATCH,
8911 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8912 .policy = nft_set_elem_list_policy,
8914 [NFT_MSG_GETSETELEM] = {
8915 .call = nf_tables_getsetelem,
8916 .type = NFNL_CB_RCU,
8917 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8918 .policy = nft_set_elem_list_policy,
8920 [NFT_MSG_DELSETELEM] = {
8921 .call = nf_tables_delsetelem,
8922 .type = NFNL_CB_BATCH,
8923 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8924 .policy = nft_set_elem_list_policy,
8926 [NFT_MSG_DESTROYSETELEM] = {
8927 .call = nf_tables_delsetelem,
8928 .type = NFNL_CB_BATCH,
8929 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8930 .policy = nft_set_elem_list_policy,
8932 [NFT_MSG_GETGEN] = {
8933 .call = nf_tables_getgen,
8934 .type = NFNL_CB_RCU,
8936 [NFT_MSG_NEWOBJ] = {
8937 .call = nf_tables_newobj,
8938 .type = NFNL_CB_BATCH,
8939 .attr_count = NFTA_OBJ_MAX,
8940 .policy = nft_obj_policy,
8942 [NFT_MSG_GETOBJ] = {
8943 .call = nf_tables_getobj,
8944 .type = NFNL_CB_RCU,
8945 .attr_count = NFTA_OBJ_MAX,
8946 .policy = nft_obj_policy,
8948 [NFT_MSG_DELOBJ] = {
8949 .call = nf_tables_delobj,
8950 .type = NFNL_CB_BATCH,
8951 .attr_count = NFTA_OBJ_MAX,
8952 .policy = nft_obj_policy,
8954 [NFT_MSG_DESTROYOBJ] = {
8955 .call = nf_tables_delobj,
8956 .type = NFNL_CB_BATCH,
8957 .attr_count = NFTA_OBJ_MAX,
8958 .policy = nft_obj_policy,
8960 [NFT_MSG_GETOBJ_RESET] = {
8961 .call = nf_tables_getobj,
8962 .type = NFNL_CB_RCU,
8963 .attr_count = NFTA_OBJ_MAX,
8964 .policy = nft_obj_policy,
8966 [NFT_MSG_NEWFLOWTABLE] = {
8967 .call = nf_tables_newflowtable,
8968 .type = NFNL_CB_BATCH,
8969 .attr_count = NFTA_FLOWTABLE_MAX,
8970 .policy = nft_flowtable_policy,
8972 [NFT_MSG_GETFLOWTABLE] = {
8973 .call = nf_tables_getflowtable,
8974 .type = NFNL_CB_RCU,
8975 .attr_count = NFTA_FLOWTABLE_MAX,
8976 .policy = nft_flowtable_policy,
8978 [NFT_MSG_DELFLOWTABLE] = {
8979 .call = nf_tables_delflowtable,
8980 .type = NFNL_CB_BATCH,
8981 .attr_count = NFTA_FLOWTABLE_MAX,
8982 .policy = nft_flowtable_policy,
8984 [NFT_MSG_DESTROYFLOWTABLE] = {
8985 .call = nf_tables_delflowtable,
8986 .type = NFNL_CB_BATCH,
8987 .attr_count = NFTA_FLOWTABLE_MAX,
8988 .policy = nft_flowtable_policy,
8992 static int nf_tables_validate(struct net *net)
8994 struct nftables_pernet *nft_net = nft_pernet(net);
8995 struct nft_table *table;
8997 list_for_each_entry(table, &nft_net->tables, list) {
8998 switch (table->validate_state) {
8999 case NFT_VALIDATE_SKIP:
9001 case NFT_VALIDATE_NEED:
9002 nft_validate_state_update(table, NFT_VALIDATE_DO);
9004 case NFT_VALIDATE_DO:
9005 if (nft_table_validate(net, table) < 0)
9008 nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9017 /* a drop policy has to be deferred until all rules have been activated,
9018 * otherwise a large ruleset that contains a drop-policy base chain will
9019 * cause all packets to get dropped until the full transaction has been
9022 * We defer the drop policy until the transaction has been finalized.
9024 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9026 struct nft_base_chain *basechain;
9028 if (nft_trans_chain_policy(trans) != NF_DROP)
9031 if (!nft_is_base_chain(trans->ctx.chain))
9034 basechain = nft_base_chain(trans->ctx.chain);
9035 basechain->policy = NF_DROP;
9038 static void nft_chain_commit_update(struct nft_trans *trans)
9040 struct nft_base_chain *basechain;
9042 if (nft_trans_chain_name(trans)) {
9043 rhltable_remove(&trans->ctx.table->chains_ht,
9044 &trans->ctx.chain->rhlhead,
9045 nft_chain_ht_params);
9046 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9047 rhltable_insert_key(&trans->ctx.table->chains_ht,
9048 trans->ctx.chain->name,
9049 &trans->ctx.chain->rhlhead,
9050 nft_chain_ht_params);
9053 if (!nft_is_base_chain(trans->ctx.chain))
9056 nft_chain_stats_replace(trans);
9058 basechain = nft_base_chain(trans->ctx.chain);
9060 switch (nft_trans_chain_policy(trans)) {
9063 basechain->policy = nft_trans_chain_policy(trans);
9068 static void nft_obj_commit_update(struct nft_trans *trans)
9070 struct nft_object *newobj;
9071 struct nft_object *obj;
9073 obj = nft_trans_obj(trans);
9074 newobj = nft_trans_obj_newobj(trans);
9076 if (obj->ops->update)
9077 obj->ops->update(obj, newobj);
9079 nft_obj_destroy(&trans->ctx, newobj);
9082 static void nft_commit_release(struct nft_trans *trans)
9084 switch (trans->msg_type) {
9085 case NFT_MSG_DELTABLE:
9086 case NFT_MSG_DESTROYTABLE:
9087 nf_tables_table_destroy(&trans->ctx);
9089 case NFT_MSG_NEWCHAIN:
9090 free_percpu(nft_trans_chain_stats(trans));
9091 kfree(nft_trans_chain_name(trans));
9093 case NFT_MSG_DELCHAIN:
9094 case NFT_MSG_DESTROYCHAIN:
9095 if (nft_trans_chain_update(trans))
9096 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9098 nf_tables_chain_destroy(&trans->ctx);
9100 case NFT_MSG_DELRULE:
9101 case NFT_MSG_DESTROYRULE:
9102 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9104 case NFT_MSG_DELSET:
9105 case NFT_MSG_DESTROYSET:
9106 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9108 case NFT_MSG_DELSETELEM:
9109 case NFT_MSG_DESTROYSETELEM:
9110 nf_tables_set_elem_destroy(&trans->ctx,
9111 nft_trans_elem_set(trans),
9112 nft_trans_elem(trans).priv);
9114 case NFT_MSG_DELOBJ:
9115 case NFT_MSG_DESTROYOBJ:
9116 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9118 case NFT_MSG_DELFLOWTABLE:
9119 case NFT_MSG_DESTROYFLOWTABLE:
9120 if (nft_trans_flowtable_update(trans))
9121 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9123 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9128 put_net(trans->ctx.net);
9133 static void nf_tables_trans_destroy_work(struct work_struct *w)
9135 struct nft_trans *trans, *next;
9138 spin_lock(&nf_tables_destroy_list_lock);
9139 list_splice_init(&nf_tables_destroy_list, &head);
9140 spin_unlock(&nf_tables_destroy_list_lock);
9142 if (list_empty(&head))
9147 list_for_each_entry_safe(trans, next, &head, list) {
9148 nft_trans_list_del(trans);
9149 nft_commit_release(trans);
9153 void nf_tables_trans_destroy_flush_work(void)
9155 flush_work(&trans_destroy_work);
9157 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9159 static bool nft_expr_reduce(struct nft_regs_track *track,
9160 const struct nft_expr *expr)
9165 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9167 const struct nft_expr *expr, *last;
9168 struct nft_regs_track track = {};
9169 unsigned int size, data_size;
9170 void *data, *data_boundary;
9171 struct nft_rule_dp *prule;
9172 struct nft_rule *rule;
9174 /* already handled or inactive chain? */
9175 if (chain->blob_next || !nft_is_active_next(net, chain))
9179 list_for_each_entry(rule, &chain->rules, list) {
9180 if (nft_is_active_next(net, rule)) {
9181 data_size += sizeof(*prule) + rule->dlen;
9182 if (data_size > INT_MAX)
9187 chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9188 if (!chain->blob_next)
9191 data = (void *)chain->blob_next->data;
9192 data_boundary = data + data_size;
9195 list_for_each_entry(rule, &chain->rules, list) {
9196 if (!nft_is_active_next(net, rule))
9199 prule = (struct nft_rule_dp *)data;
9200 data += offsetof(struct nft_rule_dp, data);
9201 if (WARN_ON_ONCE(data > data_boundary))
9205 track.last = nft_expr_last(rule);
9206 nft_rule_for_each_expr(expr, last, rule) {
9209 if (nft_expr_reduce(&track, expr)) {
9214 if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9217 memcpy(data + size, expr, expr->ops->size);
9218 size += expr->ops->size;
9220 if (WARN_ON_ONCE(size >= 1 << 12))
9223 prule->handle = rule->handle;
9229 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9232 if (WARN_ON_ONCE(data > data_boundary))
9235 prule = (struct nft_rule_dp *)data;
9236 nft_last_rule(chain, prule);
9241 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9243 struct nftables_pernet *nft_net = nft_pernet(net);
9244 struct nft_trans *trans, *next;
9246 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9247 struct nft_chain *chain = trans->ctx.chain;
9249 if (trans->msg_type == NFT_MSG_NEWRULE ||
9250 trans->msg_type == NFT_MSG_DELRULE) {
9251 kvfree(chain->blob_next);
9252 chain->blob_next = NULL;
9257 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9259 struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9264 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9266 struct nft_rule_dp_last *last;
9268 /* last rule trailer is after end marker */
9269 last = (void *)blob + sizeof(*blob) + blob->size;
9272 call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9275 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9277 struct nft_rule_blob *g0, *g1;
9280 next_genbit = nft_gencursor_next(net);
9282 g0 = rcu_dereference_protected(chain->blob_gen_0,
9283 lockdep_commit_lock_is_held(net));
9284 g1 = rcu_dereference_protected(chain->blob_gen_1,
9285 lockdep_commit_lock_is_held(net));
9287 /* No changes to this chain? */
9288 if (chain->blob_next == NULL) {
9289 /* chain had no change in last or next generation */
9293 * chain had no change in this generation; make sure next
9294 * one uses same rules as current generation.
9297 rcu_assign_pointer(chain->blob_gen_1, g0);
9298 nf_tables_commit_chain_free_rules_old(g1);
9300 rcu_assign_pointer(chain->blob_gen_0, g1);
9301 nf_tables_commit_chain_free_rules_old(g0);
9308 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9310 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9312 chain->blob_next = NULL;
9318 nf_tables_commit_chain_free_rules_old(g1);
9320 nf_tables_commit_chain_free_rules_old(g0);
9323 static void nft_obj_del(struct nft_object *obj)
9325 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9326 list_del_rcu(&obj->list);
9329 void nft_chain_del(struct nft_chain *chain)
9331 struct nft_table *table = chain->table;
9333 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9334 nft_chain_ht_params));
9335 list_del_rcu(&chain->list);
9338 static void nf_tables_module_autoload_cleanup(struct net *net)
9340 struct nftables_pernet *nft_net = nft_pernet(net);
9341 struct nft_module_request *req, *next;
9343 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9344 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9345 WARN_ON_ONCE(!req->done);
9346 list_del(&req->list);
9351 static void nf_tables_commit_release(struct net *net)
9353 struct nftables_pernet *nft_net = nft_pernet(net);
9354 struct nft_trans *trans;
9356 /* all side effects have to be made visible.
9357 * For example, if a chain named 'foo' has been deleted, a
9358 * new transaction must not find it anymore.
9360 * Memory reclaim happens asynchronously from work queue
9361 * to prevent expensive synchronize_rcu() in commit phase.
9363 if (list_empty(&nft_net->commit_list)) {
9364 nf_tables_module_autoload_cleanup(net);
9365 mutex_unlock(&nft_net->commit_mutex);
9369 trans = list_last_entry(&nft_net->commit_list,
9370 struct nft_trans, list);
9371 get_net(trans->ctx.net);
9372 WARN_ON_ONCE(trans->put_net);
9374 trans->put_net = true;
9375 spin_lock(&nf_tables_destroy_list_lock);
9376 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9377 spin_unlock(&nf_tables_destroy_list_lock);
9379 nf_tables_module_autoload_cleanup(net);
9380 schedule_work(&trans_destroy_work);
9382 mutex_unlock(&nft_net->commit_mutex);
9385 static void nft_commit_notify(struct net *net, u32 portid)
9387 struct nftables_pernet *nft_net = nft_pernet(net);
9388 struct sk_buff *batch_skb = NULL, *nskb, *skb;
9389 unsigned char *data;
9392 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9396 len = NLMSG_GOODSIZE - skb->len;
9397 list_del(&skb->list);
9401 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9402 data = skb_put(batch_skb, skb->len);
9403 memcpy(data, skb->data, skb->len);
9404 list_del(&skb->list);
9408 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9409 NFT_CB(batch_skb).report, GFP_KERNEL);
9414 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9415 NFT_CB(batch_skb).report, GFP_KERNEL);
9418 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9421 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9422 struct nft_table *table)
9424 struct nft_audit_data *adp;
9426 list_for_each_entry(adp, adl, list) {
9427 if (adp->table == table)
9430 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9434 list_add(&adp->list, adl);
9438 static void nf_tables_commit_audit_free(struct list_head *adl)
9440 struct nft_audit_data *adp, *adn;
9442 list_for_each_entry_safe(adp, adn, adl, list) {
9443 list_del(&adp->list);
9448 static void nf_tables_commit_audit_collect(struct list_head *adl,
9449 struct nft_table *table, u32 op)
9451 struct nft_audit_data *adp;
9453 list_for_each_entry(adp, adl, list) {
9454 if (adp->table == table)
9457 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9461 if (!adp->op || adp->op > op)
9465 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9467 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9469 struct nft_audit_data *adp, *adn;
9470 char aubuf[AUNFTABLENAMELEN];
9472 list_for_each_entry_safe(adp, adn, adl, list) {
9473 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9475 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9476 nft2audit_op[adp->op], GFP_KERNEL);
9477 list_del(&adp->list);
9482 static void nft_set_commit_update(struct list_head *set_update_list)
9484 struct nft_set *set, *next;
9486 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9487 list_del_init(&set->pending_update);
9489 if (!set->ops->commit)
9492 set->ops->commit(set);
9496 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9498 struct nftables_pernet *nft_net = nft_pernet(net);
9499 struct nft_trans *trans, *next;
9500 LIST_HEAD(set_update_list);
9501 struct nft_trans_elem *te;
9502 struct nft_chain *chain;
9503 struct nft_table *table;
9504 unsigned int base_seq;
9508 if (list_empty(&nft_net->commit_list)) {
9509 mutex_unlock(&nft_net->commit_mutex);
9513 list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
9514 switch (trans->msg_type) {
9515 case NFT_MSG_NEWSET:
9516 if (!nft_trans_set_update(trans) &&
9517 nft_set_is_anonymous(nft_trans_set(trans)) &&
9518 !nft_trans_set_bound(trans)) {
9519 pr_warn_once("nftables ruleset with unbound set\n");
9523 case NFT_MSG_NEWCHAIN:
9524 if (!nft_trans_chain_update(trans) &&
9525 nft_chain_binding(nft_trans_chain(trans)) &&
9526 !nft_trans_chain_bound(trans)) {
9527 pr_warn_once("nftables ruleset with unbound chain\n");
9534 /* 0. Validate ruleset, otherwise roll back for error reporting. */
9535 if (nf_tables_validate(net) < 0)
9538 err = nft_flow_rule_offload_commit(net);
9542 /* 1. Allocate space for next generation rules_gen_X[] */
9543 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9546 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9548 nf_tables_commit_chain_prepare_cancel(net);
9549 nf_tables_commit_audit_free(&adl);
9552 if (trans->msg_type == NFT_MSG_NEWRULE ||
9553 trans->msg_type == NFT_MSG_DELRULE) {
9554 chain = trans->ctx.chain;
9556 ret = nf_tables_commit_chain_prepare(net, chain);
9558 nf_tables_commit_chain_prepare_cancel(net);
9559 nf_tables_commit_audit_free(&adl);
9565 /* step 2. Make rules_gen_X visible to packet path */
9566 list_for_each_entry(table, &nft_net->tables, list) {
9567 list_for_each_entry(chain, &table->chains, list)
9568 nf_tables_commit_chain(net, chain);
9572 * Bump generation counter, invalidate any dump in progress.
9573 * Cannot fail after this point.
9575 base_seq = READ_ONCE(nft_net->base_seq);
9576 while (++base_seq == 0)
9579 WRITE_ONCE(nft_net->base_seq, base_seq);
9581 /* step 3. Start new generation, rules_gen_X now in use. */
9582 net->nft.gencursor = nft_gencursor_next(net);
9584 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9585 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9587 switch (trans->msg_type) {
9588 case NFT_MSG_NEWTABLE:
9589 if (nft_trans_table_update(trans)) {
9590 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9591 nft_trans_destroy(trans);
9594 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9595 nf_tables_table_disable(net, trans->ctx.table);
9597 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9599 nft_clear(net, trans->ctx.table);
9601 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
9602 nft_trans_destroy(trans);
9604 case NFT_MSG_DELTABLE:
9605 case NFT_MSG_DESTROYTABLE:
9606 list_del_rcu(&trans->ctx.table->list);
9607 nf_tables_table_notify(&trans->ctx, trans->msg_type);
9609 case NFT_MSG_NEWCHAIN:
9610 if (nft_trans_chain_update(trans)) {
9611 nft_chain_commit_update(trans);
9612 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
9613 &nft_trans_chain_hooks(trans));
9614 list_splice(&nft_trans_chain_hooks(trans),
9615 &nft_trans_basechain(trans)->hook_list);
9616 /* trans destroyed after rcu grace period */
9618 nft_chain_commit_drop_policy(trans);
9619 nft_clear(net, trans->ctx.chain);
9620 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
9621 nft_trans_destroy(trans);
9624 case NFT_MSG_DELCHAIN:
9625 case NFT_MSG_DESTROYCHAIN:
9626 if (nft_trans_chain_update(trans)) {
9627 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9628 &nft_trans_chain_hooks(trans));
9629 nft_netdev_unregister_hooks(net,
9630 &nft_trans_chain_hooks(trans),
9633 nft_chain_del(trans->ctx.chain);
9634 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9636 nf_tables_unregister_hook(trans->ctx.net,
9641 case NFT_MSG_NEWRULE:
9642 nft_clear(trans->ctx.net, nft_trans_rule(trans));
9643 nf_tables_rule_notify(&trans->ctx,
9644 nft_trans_rule(trans),
9646 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9647 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9649 nft_trans_destroy(trans);
9651 case NFT_MSG_DELRULE:
9652 case NFT_MSG_DESTROYRULE:
9653 list_del_rcu(&nft_trans_rule(trans)->list);
9654 nf_tables_rule_notify(&trans->ctx,
9655 nft_trans_rule(trans),
9657 nft_rule_expr_deactivate(&trans->ctx,
9658 nft_trans_rule(trans),
9661 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9662 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9664 case NFT_MSG_NEWSET:
9665 if (nft_trans_set_update(trans)) {
9666 struct nft_set *set = nft_trans_set(trans);
9668 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
9669 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
9671 nft_clear(net, nft_trans_set(trans));
9672 /* This avoids hitting -EBUSY when deleting the table
9673 * from the transaction.
9675 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
9676 !list_empty(&nft_trans_set(trans)->bindings))
9677 trans->ctx.table->use--;
9679 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9680 NFT_MSG_NEWSET, GFP_KERNEL);
9681 nft_trans_destroy(trans);
9683 case NFT_MSG_DELSET:
9684 case NFT_MSG_DESTROYSET:
9685 list_del_rcu(&nft_trans_set(trans)->list);
9686 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9687 trans->msg_type, GFP_KERNEL);
9689 case NFT_MSG_NEWSETELEM:
9690 te = (struct nft_trans_elem *)trans->data;
9692 nft_setelem_activate(net, te->set, &te->elem);
9693 nf_tables_setelem_notify(&trans->ctx, te->set,
9695 NFT_MSG_NEWSETELEM);
9696 if (te->set->ops->commit &&
9697 list_empty(&te->set->pending_update)) {
9698 list_add_tail(&te->set->pending_update,
9701 nft_trans_destroy(trans);
9703 case NFT_MSG_DELSETELEM:
9704 case NFT_MSG_DESTROYSETELEM:
9705 te = (struct nft_trans_elem *)trans->data;
9707 nf_tables_setelem_notify(&trans->ctx, te->set,
9710 nft_setelem_remove(net, te->set, &te->elem);
9711 if (!nft_setelem_is_catchall(te->set, &te->elem)) {
9712 atomic_dec(&te->set->nelems);
9715 if (te->set->ops->commit &&
9716 list_empty(&te->set->pending_update)) {
9717 list_add_tail(&te->set->pending_update,
9721 case NFT_MSG_NEWOBJ:
9722 if (nft_trans_obj_update(trans)) {
9723 nft_obj_commit_update(trans);
9724 nf_tables_obj_notify(&trans->ctx,
9725 nft_trans_obj(trans),
9728 nft_clear(net, nft_trans_obj(trans));
9729 nf_tables_obj_notify(&trans->ctx,
9730 nft_trans_obj(trans),
9732 nft_trans_destroy(trans);
9735 case NFT_MSG_DELOBJ:
9736 case NFT_MSG_DESTROYOBJ:
9737 nft_obj_del(nft_trans_obj(trans));
9738 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
9741 case NFT_MSG_NEWFLOWTABLE:
9742 if (nft_trans_flowtable_update(trans)) {
9743 nft_trans_flowtable(trans)->data.flags =
9744 nft_trans_flowtable_flags(trans);
9745 nf_tables_flowtable_notify(&trans->ctx,
9746 nft_trans_flowtable(trans),
9747 &nft_trans_flowtable_hooks(trans),
9748 NFT_MSG_NEWFLOWTABLE);
9749 list_splice(&nft_trans_flowtable_hooks(trans),
9750 &nft_trans_flowtable(trans)->hook_list);
9752 nft_clear(net, nft_trans_flowtable(trans));
9753 nf_tables_flowtable_notify(&trans->ctx,
9754 nft_trans_flowtable(trans),
9756 NFT_MSG_NEWFLOWTABLE);
9758 nft_trans_destroy(trans);
9760 case NFT_MSG_DELFLOWTABLE:
9761 case NFT_MSG_DESTROYFLOWTABLE:
9762 if (nft_trans_flowtable_update(trans)) {
9763 nf_tables_flowtable_notify(&trans->ctx,
9764 nft_trans_flowtable(trans),
9765 &nft_trans_flowtable_hooks(trans),
9767 nft_unregister_flowtable_net_hooks(net,
9768 &nft_trans_flowtable_hooks(trans));
9770 list_del_rcu(&nft_trans_flowtable(trans)->list);
9771 nf_tables_flowtable_notify(&trans->ctx,
9772 nft_trans_flowtable(trans),
9775 nft_unregister_flowtable_net_hooks(net,
9776 &nft_trans_flowtable(trans)->hook_list);
9782 nft_set_commit_update(&set_update_list);
9784 nft_commit_notify(net, NETLINK_CB(skb).portid);
9785 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
9786 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
9787 nf_tables_commit_release(net);
9792 static void nf_tables_module_autoload(struct net *net)
9794 struct nftables_pernet *nft_net = nft_pernet(net);
9795 struct nft_module_request *req, *next;
9796 LIST_HEAD(module_list);
9798 list_splice_init(&nft_net->module_list, &module_list);
9799 mutex_unlock(&nft_net->commit_mutex);
9800 list_for_each_entry_safe(req, next, &module_list, list) {
9801 request_module("%s", req->module);
9804 mutex_lock(&nft_net->commit_mutex);
9805 list_splice(&module_list, &nft_net->module_list);
9808 static void nf_tables_abort_release(struct nft_trans *trans)
9810 switch (trans->msg_type) {
9811 case NFT_MSG_NEWTABLE:
9812 nf_tables_table_destroy(&trans->ctx);
9814 case NFT_MSG_NEWCHAIN:
9815 if (nft_trans_chain_update(trans))
9816 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9818 nf_tables_chain_destroy(&trans->ctx);
9820 case NFT_MSG_NEWRULE:
9821 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9823 case NFT_MSG_NEWSET:
9824 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9826 case NFT_MSG_NEWSETELEM:
9827 nft_set_elem_destroy(nft_trans_elem_set(trans),
9828 nft_trans_elem(trans).priv, true);
9830 case NFT_MSG_NEWOBJ:
9831 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9833 case NFT_MSG_NEWFLOWTABLE:
9834 if (nft_trans_flowtable_update(trans))
9835 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9837 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9843 static void nft_set_abort_update(struct list_head *set_update_list)
9845 struct nft_set *set, *next;
9847 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9848 list_del_init(&set->pending_update);
9850 if (!set->ops->abort)
9853 set->ops->abort(set);
9857 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9859 struct nftables_pernet *nft_net = nft_pernet(net);
9860 struct nft_trans *trans, *next;
9861 LIST_HEAD(set_update_list);
9862 struct nft_trans_elem *te;
9864 if (action == NFNL_ABORT_VALIDATE &&
9865 nf_tables_validate(net) < 0)
9868 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9870 switch (trans->msg_type) {
9871 case NFT_MSG_NEWTABLE:
9872 if (nft_trans_table_update(trans)) {
9873 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9874 nft_trans_destroy(trans);
9877 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9878 nf_tables_table_disable(net, trans->ctx.table);
9879 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9880 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9881 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9883 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9884 nft_trans_destroy(trans);
9886 list_del_rcu(&trans->ctx.table->list);
9889 case NFT_MSG_DELTABLE:
9890 case NFT_MSG_DESTROYTABLE:
9891 nft_clear(trans->ctx.net, trans->ctx.table);
9892 nft_trans_destroy(trans);
9894 case NFT_MSG_NEWCHAIN:
9895 if (nft_trans_chain_update(trans)) {
9896 nft_netdev_unregister_hooks(net,
9897 &nft_trans_chain_hooks(trans),
9899 free_percpu(nft_trans_chain_stats(trans));
9900 kfree(nft_trans_chain_name(trans));
9901 nft_trans_destroy(trans);
9903 if (nft_trans_chain_bound(trans)) {
9904 nft_trans_destroy(trans);
9907 trans->ctx.table->use--;
9908 nft_chain_del(trans->ctx.chain);
9909 nf_tables_unregister_hook(trans->ctx.net,
9914 case NFT_MSG_DELCHAIN:
9915 case NFT_MSG_DESTROYCHAIN:
9916 if (nft_trans_chain_update(trans)) {
9917 list_splice(&nft_trans_chain_hooks(trans),
9918 &nft_trans_basechain(trans)->hook_list);
9920 trans->ctx.table->use++;
9921 nft_clear(trans->ctx.net, trans->ctx.chain);
9923 nft_trans_destroy(trans);
9925 case NFT_MSG_NEWRULE:
9926 if (nft_trans_rule_bound(trans)) {
9927 nft_trans_destroy(trans);
9930 trans->ctx.chain->use--;
9931 list_del_rcu(&nft_trans_rule(trans)->list);
9932 nft_rule_expr_deactivate(&trans->ctx,
9933 nft_trans_rule(trans),
9935 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9936 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9938 case NFT_MSG_DELRULE:
9939 case NFT_MSG_DESTROYRULE:
9940 trans->ctx.chain->use++;
9941 nft_clear(trans->ctx.net, nft_trans_rule(trans));
9942 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9943 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9944 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9946 nft_trans_destroy(trans);
9948 case NFT_MSG_NEWSET:
9949 if (nft_trans_set_update(trans)) {
9950 nft_trans_destroy(trans);
9953 trans->ctx.table->use--;
9954 if (nft_trans_set_bound(trans)) {
9955 nft_trans_destroy(trans);
9958 list_del_rcu(&nft_trans_set(trans)->list);
9960 case NFT_MSG_DELSET:
9961 case NFT_MSG_DESTROYSET:
9962 trans->ctx.table->use++;
9963 nft_clear(trans->ctx.net, nft_trans_set(trans));
9964 if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
9965 nft_map_activate(&trans->ctx, nft_trans_set(trans));
9967 nft_trans_destroy(trans);
9969 case NFT_MSG_NEWSETELEM:
9970 if (nft_trans_elem_set_bound(trans)) {
9971 nft_trans_destroy(trans);
9974 te = (struct nft_trans_elem *)trans->data;
9975 nft_setelem_remove(net, te->set, &te->elem);
9976 if (!nft_setelem_is_catchall(te->set, &te->elem))
9977 atomic_dec(&te->set->nelems);
9979 if (te->set->ops->abort &&
9980 list_empty(&te->set->pending_update)) {
9981 list_add_tail(&te->set->pending_update,
9985 case NFT_MSG_DELSETELEM:
9986 case NFT_MSG_DESTROYSETELEM:
9987 te = (struct nft_trans_elem *)trans->data;
9989 nft_setelem_data_activate(net, te->set, &te->elem);
9990 nft_setelem_activate(net, te->set, &te->elem);
9991 if (!nft_setelem_is_catchall(te->set, &te->elem))
9994 if (te->set->ops->abort &&
9995 list_empty(&te->set->pending_update)) {
9996 list_add_tail(&te->set->pending_update,
9999 nft_trans_destroy(trans);
10001 case NFT_MSG_NEWOBJ:
10002 if (nft_trans_obj_update(trans)) {
10003 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10004 nft_trans_destroy(trans);
10006 trans->ctx.table->use--;
10007 nft_obj_del(nft_trans_obj(trans));
10010 case NFT_MSG_DELOBJ:
10011 case NFT_MSG_DESTROYOBJ:
10012 trans->ctx.table->use++;
10013 nft_clear(trans->ctx.net, nft_trans_obj(trans));
10014 nft_trans_destroy(trans);
10016 case NFT_MSG_NEWFLOWTABLE:
10017 if (nft_trans_flowtable_update(trans)) {
10018 nft_unregister_flowtable_net_hooks(net,
10019 &nft_trans_flowtable_hooks(trans));
10021 trans->ctx.table->use--;
10022 list_del_rcu(&nft_trans_flowtable(trans)->list);
10023 nft_unregister_flowtable_net_hooks(net,
10024 &nft_trans_flowtable(trans)->hook_list);
10027 case NFT_MSG_DELFLOWTABLE:
10028 case NFT_MSG_DESTROYFLOWTABLE:
10029 if (nft_trans_flowtable_update(trans)) {
10030 list_splice(&nft_trans_flowtable_hooks(trans),
10031 &nft_trans_flowtable(trans)->hook_list);
10033 trans->ctx.table->use++;
10034 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10036 nft_trans_destroy(trans);
10041 nft_set_abort_update(&set_update_list);
10045 list_for_each_entry_safe_reverse(trans, next,
10046 &nft_net->commit_list, list) {
10047 nft_trans_list_del(trans);
10048 nf_tables_abort_release(trans);
10051 if (action == NFNL_ABORT_AUTOLOAD)
10052 nf_tables_module_autoload(net);
10054 nf_tables_module_autoload_cleanup(net);
10059 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10060 enum nfnl_abort_action action)
10062 struct nftables_pernet *nft_net = nft_pernet(net);
10063 int ret = __nf_tables_abort(net, action);
10065 mutex_unlock(&nft_net->commit_mutex);
10070 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10072 struct nftables_pernet *nft_net = nft_pernet(net);
10075 mutex_lock(&nft_net->commit_mutex);
10077 genid_ok = genid == 0 || nft_net->base_seq == genid;
10079 mutex_unlock(&nft_net->commit_mutex);
10081 /* else, commit mutex has to be released by commit or abort function */
10085 static const struct nfnetlink_subsystem nf_tables_subsys = {
10086 .name = "nf_tables",
10087 .subsys_id = NFNL_SUBSYS_NFTABLES,
10088 .cb_count = NFT_MSG_MAX,
10089 .cb = nf_tables_cb,
10090 .commit = nf_tables_commit,
10091 .abort = nf_tables_abort,
10092 .valid_genid = nf_tables_valid_genid,
10093 .owner = THIS_MODULE,
10096 int nft_chain_validate_dependency(const struct nft_chain *chain,
10097 enum nft_chain_types type)
10099 const struct nft_base_chain *basechain;
10101 if (nft_is_base_chain(chain)) {
10102 basechain = nft_base_chain(chain);
10103 if (basechain->type->type != type)
10104 return -EOPNOTSUPP;
10108 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10110 int nft_chain_validate_hooks(const struct nft_chain *chain,
10111 unsigned int hook_flags)
10113 struct nft_base_chain *basechain;
10115 if (nft_is_base_chain(chain)) {
10116 basechain = nft_base_chain(chain);
10118 if ((1 << basechain->ops.hooknum) & hook_flags)
10121 return -EOPNOTSUPP;
10126 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10129 * Loop detection - walk through the ruleset beginning at the destination chain
10130 * of a new jump until either the source chain is reached (loop) or all
10131 * reachable chains have been traversed.
10133 * The loop check is performed whenever a new jump verdict is added to an
10134 * expression or verdict map or a verdict map is bound to a new chain.
10137 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10138 const struct nft_chain *chain);
10140 static int nft_check_loops(const struct nft_ctx *ctx,
10141 const struct nft_set_ext *ext)
10143 const struct nft_data *data;
10146 data = nft_set_ext_data(ext);
10147 switch (data->verdict.code) {
10150 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10160 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10161 struct nft_set *set,
10162 const struct nft_set_iter *iter,
10163 struct nft_set_elem *elem)
10165 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
10167 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10168 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10171 return nft_check_loops(ctx, ext);
10174 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10175 struct nft_set *set)
10177 u8 genmask = nft_genmask_next(ctx->net);
10178 struct nft_set_elem_catchall *catchall;
10179 struct nft_set_ext *ext;
10182 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10183 ext = nft_set_elem_ext(set, catchall->elem);
10184 if (!nft_set_elem_active(ext, genmask))
10187 ret = nft_check_loops(ctx, ext);
10195 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10196 const struct nft_chain *chain)
10198 const struct nft_rule *rule;
10199 const struct nft_expr *expr, *last;
10200 struct nft_set *set;
10201 struct nft_set_binding *binding;
10202 struct nft_set_iter iter;
10204 if (ctx->chain == chain)
10207 list_for_each_entry(rule, &chain->rules, list) {
10208 nft_rule_for_each_expr(expr, last, rule) {
10209 struct nft_immediate_expr *priv;
10210 const struct nft_data *data;
10213 if (strcmp(expr->ops->type->name, "immediate"))
10216 priv = nft_expr_priv(expr);
10217 if (priv->dreg != NFT_REG_VERDICT)
10220 data = &priv->data;
10221 switch (data->verdict.code) {
10224 err = nf_tables_check_loops(ctx,
10225 data->verdict.chain);
10235 list_for_each_entry(set, &ctx->table->sets, list) {
10236 if (!nft_is_active_next(ctx->net, set))
10238 if (!(set->flags & NFT_SET_MAP) ||
10239 set->dtype != NFT_DATA_VERDICT)
10242 list_for_each_entry(binding, &set->bindings, list) {
10243 if (!(binding->flags & NFT_SET_MAP) ||
10244 binding->chain != chain)
10247 iter.genmask = nft_genmask_next(ctx->net);
10251 iter.fn = nf_tables_loop_check_setelem;
10253 set->ops->walk(ctx, set, &iter);
10255 iter.err = nft_set_catchall_loops(ctx, set);
10266 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
10268 * @attr: netlink attribute to fetch value from
10269 * @max: maximum value to be stored in dest
10270 * @dest: pointer to the variable
10272 * Parse, check and store a given u32 netlink attribute into variable.
10273 * This function returns -ERANGE if the value goes over maximum value.
10274 * Otherwise a 0 is returned and the attribute value is stored in the
10275 * destination variable.
10277 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10281 val = ntohl(nla_get_be32(attr));
10288 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10290 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10294 reg = ntohl(nla_get_be32(attr));
10296 case NFT_REG_VERDICT...NFT_REG_4:
10297 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10299 case NFT_REG32_00...NFT_REG32_15:
10300 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10310 * nft_dump_register - dump a register value to a netlink attribute
10312 * @skb: socket buffer
10313 * @attr: attribute number
10314 * @reg: register number
10316 * Construct a netlink attribute containing the register number. For
10317 * compatibility reasons, register numbers being a multiple of 4 are
10318 * translated to the corresponding 128 bit register numbers.
10320 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10322 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10323 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10325 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10327 return nla_put_be32(skb, attr, htonl(reg));
10329 EXPORT_SYMBOL_GPL(nft_dump_register);
10331 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10333 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10337 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10343 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10348 err = nft_parse_register(attr, ®);
10352 err = nft_validate_register_load(reg, len);
10359 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10361 static int nft_validate_register_store(const struct nft_ctx *ctx,
10362 enum nft_registers reg,
10363 const struct nft_data *data,
10364 enum nft_data_types type,
10370 case NFT_REG_VERDICT:
10371 if (type != NFT_DATA_VERDICT)
10374 if (data != NULL &&
10375 (data->verdict.code == NFT_GOTO ||
10376 data->verdict.code == NFT_JUMP)) {
10377 err = nf_tables_check_loops(ctx, data->verdict.chain);
10384 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10388 if (reg * NFT_REG32_SIZE + len >
10389 sizeof_field(struct nft_regs, data))
10392 if (data != NULL && type != NFT_DATA_VALUE)
10398 int nft_parse_register_store(const struct nft_ctx *ctx,
10399 const struct nlattr *attr, u8 *dreg,
10400 const struct nft_data *data,
10401 enum nft_data_types type, unsigned int len)
10406 err = nft_parse_register(attr, ®);
10410 err = nft_validate_register_store(ctx, reg, data, type, len);
10417 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10419 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10420 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
10421 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
10422 .len = NFT_CHAIN_MAXNAMELEN - 1 },
10423 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10426 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10427 struct nft_data_desc *desc, const struct nlattr *nla)
10429 u8 genmask = nft_genmask_next(ctx->net);
10430 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10431 struct nft_chain *chain;
10434 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10435 nft_verdict_policy, NULL);
10439 if (!tb[NFTA_VERDICT_CODE])
10441 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10443 switch (data->verdict.code) {
10445 switch (data->verdict.code & NF_VERDICT_MASK) {
10460 if (tb[NFTA_VERDICT_CHAIN]) {
10461 chain = nft_chain_lookup(ctx->net, ctx->table,
10462 tb[NFTA_VERDICT_CHAIN],
10464 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10465 chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10466 tb[NFTA_VERDICT_CHAIN_ID]);
10468 return PTR_ERR(chain);
10474 return PTR_ERR(chain);
10475 if (nft_is_base_chain(chain))
10476 return -EOPNOTSUPP;
10477 if (nft_chain_is_bound(chain))
10479 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10480 chain->flags & NFT_CHAIN_BINDING)
10484 data->verdict.chain = chain;
10488 desc->len = sizeof(data->verdict);
10493 static void nft_verdict_uninit(const struct nft_data *data)
10495 struct nft_chain *chain;
10497 switch (data->verdict.code) {
10500 chain = data->verdict.chain;
10506 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10508 struct nlattr *nest;
10510 nest = nla_nest_start_noflag(skb, type);
10512 goto nla_put_failure;
10514 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10515 goto nla_put_failure;
10520 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10522 goto nla_put_failure;
10524 nla_nest_end(skb, nest);
10531 static int nft_value_init(const struct nft_ctx *ctx,
10532 struct nft_data *data, struct nft_data_desc *desc,
10533 const struct nlattr *nla)
10537 len = nla_len(nla);
10540 if (len > desc->size)
10543 if (len != desc->len)
10549 nla_memcpy(data->data, nla, len);
10554 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10557 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10560 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10561 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
10562 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
10566 * nft_data_init - parse nf_tables data netlink attributes
10568 * @ctx: context of the expression using the data
10569 * @data: destination struct nft_data
10570 * @desc: data description
10571 * @nla: netlink attribute containing data
10573 * Parse the netlink data attributes and initialize a struct nft_data.
10574 * The type and length of data are returned in the data description.
10576 * The caller can indicate that it only wants to accept data of type
10577 * NFT_DATA_VALUE by passing NULL for the ctx argument.
10579 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
10580 struct nft_data_desc *desc, const struct nlattr *nla)
10582 struct nlattr *tb[NFTA_DATA_MAX + 1];
10585 if (WARN_ON_ONCE(!desc->size))
10588 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
10589 nft_data_policy, NULL);
10593 if (tb[NFTA_DATA_VALUE]) {
10594 if (desc->type != NFT_DATA_VALUE)
10597 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
10598 } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
10599 if (desc->type != NFT_DATA_VERDICT)
10602 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
10609 EXPORT_SYMBOL_GPL(nft_data_init);
10612 * nft_data_release - release a nft_data item
10614 * @data: struct nft_data to release
10615 * @type: type of data
10617 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
10618 * all others need to be released by calling this function.
10620 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
10622 if (type < NFT_DATA_VERDICT)
10625 case NFT_DATA_VERDICT:
10626 return nft_verdict_uninit(data);
10631 EXPORT_SYMBOL_GPL(nft_data_release);
10633 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
10634 enum nft_data_types type, unsigned int len)
10636 struct nlattr *nest;
10639 nest = nla_nest_start_noflag(skb, attr);
10644 case NFT_DATA_VALUE:
10645 err = nft_value_dump(skb, data, len);
10647 case NFT_DATA_VERDICT:
10648 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
10655 nla_nest_end(skb, nest);
10658 EXPORT_SYMBOL_GPL(nft_data_dump);
10660 int __nft_release_basechain(struct nft_ctx *ctx)
10662 struct nft_rule *rule, *nr;
10664 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
10667 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
10668 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
10669 list_del(&rule->list);
10671 nf_tables_rule_release(ctx, rule);
10673 nft_chain_del(ctx->chain);
10675 nf_tables_chain_destroy(ctx);
10679 EXPORT_SYMBOL_GPL(__nft_release_basechain);
10681 static void __nft_release_hook(struct net *net, struct nft_table *table)
10683 struct nft_flowtable *flowtable;
10684 struct nft_chain *chain;
10686 list_for_each_entry(chain, &table->chains, list)
10687 __nf_tables_unregister_hook(net, table, chain, true);
10688 list_for_each_entry(flowtable, &table->flowtables, list)
10689 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
10693 static void __nft_release_hooks(struct net *net)
10695 struct nftables_pernet *nft_net = nft_pernet(net);
10696 struct nft_table *table;
10698 list_for_each_entry(table, &nft_net->tables, list) {
10699 if (nft_table_has_owner(table))
10702 __nft_release_hook(net, table);
10706 static void __nft_release_table(struct net *net, struct nft_table *table)
10708 struct nft_flowtable *flowtable, *nf;
10709 struct nft_chain *chain, *nc;
10710 struct nft_object *obj, *ne;
10711 struct nft_rule *rule, *nr;
10712 struct nft_set *set, *ns;
10713 struct nft_ctx ctx = {
10715 .family = NFPROTO_NETDEV,
10718 ctx.family = table->family;
10720 list_for_each_entry(chain, &table->chains, list) {
10722 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
10723 list_del(&rule->list);
10725 nf_tables_rule_release(&ctx, rule);
10728 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
10729 list_del(&flowtable->list);
10731 nf_tables_flowtable_destroy(flowtable);
10733 list_for_each_entry_safe(set, ns, &table->sets, list) {
10734 list_del(&set->list);
10736 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10737 nft_map_deactivate(&ctx, set);
10739 nft_set_destroy(&ctx, set);
10741 list_for_each_entry_safe(obj, ne, &table->objects, list) {
10744 nft_obj_destroy(&ctx, obj);
10746 list_for_each_entry_safe(chain, nc, &table->chains, list) {
10748 nft_chain_del(chain);
10750 nf_tables_chain_destroy(&ctx);
10752 nf_tables_table_destroy(&ctx);
10755 static void __nft_release_tables(struct net *net)
10757 struct nftables_pernet *nft_net = nft_pernet(net);
10758 struct nft_table *table, *nt;
10760 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
10761 if (nft_table_has_owner(table))
10764 list_del(&table->list);
10766 __nft_release_table(net, table);
10770 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
10773 struct nft_table *table, *to_delete[8];
10774 struct nftables_pernet *nft_net;
10775 struct netlink_notify *n = ptr;
10776 struct net *net = n->net;
10777 unsigned int deleted;
10778 bool restart = false;
10780 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
10781 return NOTIFY_DONE;
10783 nft_net = nft_pernet(net);
10785 mutex_lock(&nft_net->commit_mutex);
10786 if (!list_empty(&nf_tables_destroy_list))
10789 list_for_each_entry(table, &nft_net->tables, list) {
10790 if (nft_table_has_owner(table) &&
10791 n->portid == table->nlpid) {
10792 __nft_release_hook(net, table);
10793 list_del_rcu(&table->list);
10794 to_delete[deleted++] = table;
10795 if (deleted >= ARRAY_SIZE(to_delete))
10800 restart = deleted >= ARRAY_SIZE(to_delete);
10803 __nft_release_table(net, to_delete[--deleted]);
10808 mutex_unlock(&nft_net->commit_mutex);
10810 return NOTIFY_DONE;
10813 static struct notifier_block nft_nl_notifier = {
10814 .notifier_call = nft_rcv_nl_event,
10817 static int __net_init nf_tables_init_net(struct net *net)
10819 struct nftables_pernet *nft_net = nft_pernet(net);
10821 INIT_LIST_HEAD(&nft_net->tables);
10822 INIT_LIST_HEAD(&nft_net->commit_list);
10823 INIT_LIST_HEAD(&nft_net->binding_list);
10824 INIT_LIST_HEAD(&nft_net->module_list);
10825 INIT_LIST_HEAD(&nft_net->notify_list);
10826 mutex_init(&nft_net->commit_mutex);
10827 nft_net->base_seq = 1;
10832 static void __net_exit nf_tables_pre_exit_net(struct net *net)
10834 struct nftables_pernet *nft_net = nft_pernet(net);
10836 mutex_lock(&nft_net->commit_mutex);
10837 __nft_release_hooks(net);
10838 mutex_unlock(&nft_net->commit_mutex);
10841 static void __net_exit nf_tables_exit_net(struct net *net)
10843 struct nftables_pernet *nft_net = nft_pernet(net);
10845 mutex_lock(&nft_net->commit_mutex);
10846 if (!list_empty(&nft_net->commit_list) ||
10847 !list_empty(&nft_net->module_list))
10848 __nf_tables_abort(net, NFNL_ABORT_NONE);
10849 __nft_release_tables(net);
10850 mutex_unlock(&nft_net->commit_mutex);
10851 WARN_ON_ONCE(!list_empty(&nft_net->tables));
10852 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
10853 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10856 static struct pernet_operations nf_tables_net_ops = {
10857 .init = nf_tables_init_net,
10858 .pre_exit = nf_tables_pre_exit_net,
10859 .exit = nf_tables_exit_net,
10860 .id = &nf_tables_net_id,
10861 .size = sizeof(struct nftables_pernet),
10864 static int __init nf_tables_module_init(void)
10868 err = register_pernet_subsys(&nf_tables_net_ops);
10872 err = nft_chain_filter_init();
10874 goto err_chain_filter;
10876 err = nf_tables_core_module_init();
10878 goto err_core_module;
10880 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10882 goto err_netdev_notifier;
10884 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10886 goto err_rht_objname;
10888 err = nft_offload_init();
10892 err = netlink_register_notifier(&nft_nl_notifier);
10894 goto err_netlink_notifier;
10897 err = nfnetlink_subsys_register(&nf_tables_subsys);
10899 goto err_nfnl_subsys;
10901 nft_chain_route_init();
10906 netlink_unregister_notifier(&nft_nl_notifier);
10907 err_netlink_notifier:
10908 nft_offload_exit();
10910 rhltable_destroy(&nft_objname_ht);
10912 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10913 err_netdev_notifier:
10914 nf_tables_core_module_exit();
10916 nft_chain_filter_fini();
10918 unregister_pernet_subsys(&nf_tables_net_ops);
10922 static void __exit nf_tables_module_exit(void)
10924 nfnetlink_subsys_unregister(&nf_tables_subsys);
10925 netlink_unregister_notifier(&nft_nl_notifier);
10926 nft_offload_exit();
10927 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10928 nft_chain_filter_fini();
10929 nft_chain_route_fini();
10930 unregister_pernet_subsys(&nf_tables_net_ops);
10931 cancel_work_sync(&trans_destroy_work);
10933 rhltable_destroy(&nft_objname_ht);
10934 nf_tables_core_module_exit();
10937 module_init(nf_tables_module_init);
10938 module_exit(nf_tables_module_exit);
10940 MODULE_LICENSE("GPL");
10941 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10942 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);