2 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/list.h>
14 #include <linux/skbuff.h>
15 #include <linux/netlink.h>
16 #include <linux/vmalloc.h>
17 #include <linux/netfilter.h>
18 #include <linux/netfilter/nfnetlink.h>
19 #include <linux/netfilter/nf_tables.h>
20 #include <net/netfilter/nf_tables_core.h>
21 #include <net/netfilter/nf_tables.h>
22 #include <net/net_namespace.h>
25 static LIST_HEAD(nf_tables_expressions
);
26 static LIST_HEAD(nf_tables_objects
);
29 * nft_register_afinfo - register nf_tables address family info
31 * @afi: address family info to register
33 * Register the address family for use with nf_tables. Returns zero on
34 * success or a negative errno code otherwise.
36 int nft_register_afinfo(struct net
*net
, struct nft_af_info
*afi
)
38 INIT_LIST_HEAD(&afi
->tables
);
39 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
40 list_add_tail_rcu(&afi
->list
, &net
->nft
.af_info
);
41 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
44 EXPORT_SYMBOL_GPL(nft_register_afinfo
);
46 static void __nft_release_afinfo(struct net
*net
, struct nft_af_info
*afi
);
49 * nft_unregister_afinfo - unregister nf_tables address family info
51 * @afi: address family info to unregister
53 * Unregister the address family for use with nf_tables.
55 void nft_unregister_afinfo(struct net
*net
, struct nft_af_info
*afi
)
57 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
58 __nft_release_afinfo(net
, afi
);
59 list_del_rcu(&afi
->list
);
60 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
62 EXPORT_SYMBOL_GPL(nft_unregister_afinfo
);
64 static struct nft_af_info
*nft_afinfo_lookup(struct net
*net
, int family
)
66 struct nft_af_info
*afi
;
68 list_for_each_entry(afi
, &net
->nft
.af_info
, list
) {
69 if (afi
->family
== family
)
75 static struct nft_af_info
*
76 nf_tables_afinfo_lookup(struct net
*net
, int family
, bool autoload
)
78 struct nft_af_info
*afi
;
80 afi
= nft_afinfo_lookup(net
, family
);
85 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
86 request_module("nft-afinfo-%u", family
);
87 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
88 afi
= nft_afinfo_lookup(net
, family
);
90 return ERR_PTR(-EAGAIN
);
93 return ERR_PTR(-EAFNOSUPPORT
);
96 static void nft_ctx_init(struct nft_ctx
*ctx
,
98 const struct sk_buff
*skb
,
99 const struct nlmsghdr
*nlh
,
100 struct nft_af_info
*afi
,
101 struct nft_table
*table
,
102 struct nft_chain
*chain
,
103 const struct nlattr
* const *nla
)
110 ctx
->portid
= NETLINK_CB(skb
).portid
;
111 ctx
->report
= nlmsg_report(nlh
);
112 ctx
->seq
= nlh
->nlmsg_seq
;
115 static struct nft_trans
*nft_trans_alloc_gfp(const struct nft_ctx
*ctx
,
116 int msg_type
, u32 size
, gfp_t gfp
)
118 struct nft_trans
*trans
;
120 trans
= kzalloc(sizeof(struct nft_trans
) + size
, gfp
);
124 trans
->msg_type
= msg_type
;
130 static struct nft_trans
*nft_trans_alloc(const struct nft_ctx
*ctx
,
131 int msg_type
, u32 size
)
133 return nft_trans_alloc_gfp(ctx
, msg_type
, size
, GFP_KERNEL
);
136 static void nft_trans_destroy(struct nft_trans
*trans
)
138 list_del(&trans
->list
);
142 static int nf_tables_register_hooks(struct net
*net
,
143 const struct nft_table
*table
,
144 struct nft_chain
*chain
,
145 unsigned int hook_nops
)
147 if (table
->flags
& NFT_TABLE_F_DORMANT
||
148 !nft_is_base_chain(chain
))
151 return nf_register_net_hooks(net
, nft_base_chain(chain
)->ops
,
155 static void nf_tables_unregister_hooks(struct net
*net
,
156 const struct nft_table
*table
,
157 struct nft_chain
*chain
,
158 unsigned int hook_nops
)
160 if (table
->flags
& NFT_TABLE_F_DORMANT
||
161 !nft_is_base_chain(chain
))
164 nf_unregister_net_hooks(net
, nft_base_chain(chain
)->ops
, hook_nops
);
167 static int nft_trans_table_add(struct nft_ctx
*ctx
, int msg_type
)
169 struct nft_trans
*trans
;
171 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_table
));
175 if (msg_type
== NFT_MSG_NEWTABLE
)
176 nft_activate_next(ctx
->net
, ctx
->table
);
178 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
182 static int nft_deltable(struct nft_ctx
*ctx
)
186 err
= nft_trans_table_add(ctx
, NFT_MSG_DELTABLE
);
190 nft_deactivate_next(ctx
->net
, ctx
->table
);
194 static int nft_trans_chain_add(struct nft_ctx
*ctx
, int msg_type
)
196 struct nft_trans
*trans
;
198 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_chain
));
202 if (msg_type
== NFT_MSG_NEWCHAIN
)
203 nft_activate_next(ctx
->net
, ctx
->chain
);
205 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
209 static int nft_delchain(struct nft_ctx
*ctx
)
213 err
= nft_trans_chain_add(ctx
, NFT_MSG_DELCHAIN
);
218 nft_deactivate_next(ctx
->net
, ctx
->chain
);
224 nf_tables_delrule_deactivate(struct nft_ctx
*ctx
, struct nft_rule
*rule
)
226 /* You cannot delete the same rule twice */
227 if (nft_is_active_next(ctx
->net
, rule
)) {
228 nft_deactivate_next(ctx
->net
, rule
);
235 static struct nft_trans
*nft_trans_rule_add(struct nft_ctx
*ctx
, int msg_type
,
236 struct nft_rule
*rule
)
238 struct nft_trans
*trans
;
240 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_rule
));
244 if (msg_type
== NFT_MSG_NEWRULE
&& ctx
->nla
[NFTA_RULE_ID
] != NULL
) {
245 nft_trans_rule_id(trans
) =
246 ntohl(nla_get_be32(ctx
->nla
[NFTA_RULE_ID
]));
248 nft_trans_rule(trans
) = rule
;
249 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
254 static int nft_delrule(struct nft_ctx
*ctx
, struct nft_rule
*rule
)
256 struct nft_trans
*trans
;
259 trans
= nft_trans_rule_add(ctx
, NFT_MSG_DELRULE
, rule
);
263 err
= nf_tables_delrule_deactivate(ctx
, rule
);
265 nft_trans_destroy(trans
);
272 static int nft_delrule_by_chain(struct nft_ctx
*ctx
)
274 struct nft_rule
*rule
;
277 list_for_each_entry(rule
, &ctx
->chain
->rules
, list
) {
278 err
= nft_delrule(ctx
, rule
);
285 static int nft_trans_set_add(struct nft_ctx
*ctx
, int msg_type
,
288 struct nft_trans
*trans
;
290 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_set
));
294 if (msg_type
== NFT_MSG_NEWSET
&& ctx
->nla
[NFTA_SET_ID
] != NULL
) {
295 nft_trans_set_id(trans
) =
296 ntohl(nla_get_be32(ctx
->nla
[NFTA_SET_ID
]));
297 nft_activate_next(ctx
->net
, set
);
299 nft_trans_set(trans
) = set
;
300 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
305 static int nft_delset(struct nft_ctx
*ctx
, struct nft_set
*set
)
309 err
= nft_trans_set_add(ctx
, NFT_MSG_DELSET
, set
);
313 nft_deactivate_next(ctx
->net
, set
);
319 static int nft_trans_obj_add(struct nft_ctx
*ctx
, int msg_type
,
320 struct nft_object
*obj
)
322 struct nft_trans
*trans
;
324 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_obj
));
328 if (msg_type
== NFT_MSG_NEWOBJ
)
329 nft_activate_next(ctx
->net
, obj
);
331 nft_trans_obj(trans
) = obj
;
332 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
337 static int nft_delobj(struct nft_ctx
*ctx
, struct nft_object
*obj
)
341 err
= nft_trans_obj_add(ctx
, NFT_MSG_DELOBJ
, obj
);
345 nft_deactivate_next(ctx
->net
, obj
);
355 static struct nft_table
*nft_table_lookup(const struct nft_af_info
*afi
,
356 const struct nlattr
*nla
,
359 struct nft_table
*table
;
361 list_for_each_entry(table
, &afi
->tables
, list
) {
362 if (!nla_strcmp(nla
, table
->name
) &&
363 nft_active_genmask(table
, genmask
))
369 static struct nft_table
*nf_tables_table_lookup(const struct nft_af_info
*afi
,
370 const struct nlattr
*nla
,
373 struct nft_table
*table
;
376 return ERR_PTR(-EINVAL
);
378 table
= nft_table_lookup(afi
, nla
, genmask
);
382 return ERR_PTR(-ENOENT
);
385 static inline u64
nf_tables_alloc_handle(struct nft_table
*table
)
387 return ++table
->hgenerator
;
390 static const struct nf_chain_type
*chain_type
[NFPROTO_NUMPROTO
][NFT_CHAIN_T_MAX
];
392 static const struct nf_chain_type
*
393 __nf_tables_chain_type_lookup(int family
, const struct nlattr
*nla
)
397 for (i
= 0; i
< NFT_CHAIN_T_MAX
; i
++) {
398 if (chain_type
[family
][i
] != NULL
&&
399 !nla_strcmp(nla
, chain_type
[family
][i
]->name
))
400 return chain_type
[family
][i
];
405 static const struct nf_chain_type
*
406 nf_tables_chain_type_lookup(const struct nft_af_info
*afi
,
407 const struct nlattr
*nla
,
410 const struct nf_chain_type
*type
;
412 type
= __nf_tables_chain_type_lookup(afi
->family
, nla
);
415 #ifdef CONFIG_MODULES
417 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
418 request_module("nft-chain-%u-%.*s", afi
->family
,
419 nla_len(nla
), (const char *)nla_data(nla
));
420 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
421 type
= __nf_tables_chain_type_lookup(afi
->family
, nla
);
423 return ERR_PTR(-EAGAIN
);
426 return ERR_PTR(-ENOENT
);
429 static const struct nla_policy nft_table_policy
[NFTA_TABLE_MAX
+ 1] = {
430 [NFTA_TABLE_NAME
] = { .type
= NLA_STRING
,
431 .len
= NFT_TABLE_MAXNAMELEN
- 1 },
432 [NFTA_TABLE_FLAGS
] = { .type
= NLA_U32
},
435 static int nf_tables_fill_table_info(struct sk_buff
*skb
, struct net
*net
,
436 u32 portid
, u32 seq
, int event
, u32 flags
,
437 int family
, const struct nft_table
*table
)
439 struct nlmsghdr
*nlh
;
440 struct nfgenmsg
*nfmsg
;
442 event
= nfnl_msg_type(NFNL_SUBSYS_NFTABLES
, event
);
443 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
), flags
);
445 goto nla_put_failure
;
447 nfmsg
= nlmsg_data(nlh
);
448 nfmsg
->nfgen_family
= family
;
449 nfmsg
->version
= NFNETLINK_V0
;
450 nfmsg
->res_id
= htons(net
->nft
.base_seq
& 0xffff);
452 if (nla_put_string(skb
, NFTA_TABLE_NAME
, table
->name
) ||
453 nla_put_be32(skb
, NFTA_TABLE_FLAGS
, htonl(table
->flags
)) ||
454 nla_put_be32(skb
, NFTA_TABLE_USE
, htonl(table
->use
)))
455 goto nla_put_failure
;
461 nlmsg_trim(skb
, nlh
);
465 static void nf_tables_table_notify(const struct nft_ctx
*ctx
, int event
)
471 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
474 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
478 err
= nf_tables_fill_table_info(skb
, ctx
->net
, ctx
->portid
, ctx
->seq
,
479 event
, 0, ctx
->afi
->family
, ctx
->table
);
485 nfnetlink_send(skb
, ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
486 ctx
->report
, GFP_KERNEL
);
489 nfnetlink_set_err(ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
, -ENOBUFS
);
492 static int nf_tables_dump_tables(struct sk_buff
*skb
,
493 struct netlink_callback
*cb
)
495 const struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
496 const struct nft_af_info
*afi
;
497 const struct nft_table
*table
;
498 unsigned int idx
= 0, s_idx
= cb
->args
[0];
499 struct net
*net
= sock_net(skb
->sk
);
500 int family
= nfmsg
->nfgen_family
;
503 cb
->seq
= net
->nft
.base_seq
;
505 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
506 if (family
!= NFPROTO_UNSPEC
&& family
!= afi
->family
)
509 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
513 memset(&cb
->args
[1], 0,
514 sizeof(cb
->args
) - sizeof(cb
->args
[0]));
515 if (!nft_is_active(net
, table
))
517 if (nf_tables_fill_table_info(skb
, net
,
518 NETLINK_CB(cb
->skb
).portid
,
522 afi
->family
, table
) < 0)
525 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
536 static int nf_tables_gettable(struct net
*net
, struct sock
*nlsk
,
537 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
538 const struct nlattr
* const nla
[],
539 struct netlink_ext_ack
*extack
)
541 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
542 u8 genmask
= nft_genmask_cur(net
);
543 const struct nft_af_info
*afi
;
544 const struct nft_table
*table
;
545 struct sk_buff
*skb2
;
546 int family
= nfmsg
->nfgen_family
;
549 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
550 struct netlink_dump_control c
= {
551 .dump
= nf_tables_dump_tables
,
553 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
556 afi
= nf_tables_afinfo_lookup(net
, family
, false);
560 table
= nf_tables_table_lookup(afi
, nla
[NFTA_TABLE_NAME
], genmask
);
562 return PTR_ERR(table
);
564 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
568 err
= nf_tables_fill_table_info(skb2
, net
, NETLINK_CB(skb
).portid
,
569 nlh
->nlmsg_seq
, NFT_MSG_NEWTABLE
, 0,
574 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
581 static void _nf_tables_table_disable(struct net
*net
,
582 const struct nft_af_info
*afi
,
583 struct nft_table
*table
,
586 struct nft_chain
*chain
;
589 list_for_each_entry(chain
, &table
->chains
, list
) {
590 if (!nft_is_active_next(net
, chain
))
592 if (!nft_is_base_chain(chain
))
595 if (cnt
&& i
++ == cnt
)
598 nf_unregister_net_hooks(net
, nft_base_chain(chain
)->ops
,
603 static int nf_tables_table_enable(struct net
*net
,
604 const struct nft_af_info
*afi
,
605 struct nft_table
*table
)
607 struct nft_chain
*chain
;
610 list_for_each_entry(chain
, &table
->chains
, list
) {
611 if (!nft_is_active_next(net
, chain
))
613 if (!nft_is_base_chain(chain
))
616 err
= nf_register_net_hooks(net
, nft_base_chain(chain
)->ops
,
626 _nf_tables_table_disable(net
, afi
, table
, i
);
630 static void nf_tables_table_disable(struct net
*net
,
631 const struct nft_af_info
*afi
,
632 struct nft_table
*table
)
634 _nf_tables_table_disable(net
, afi
, table
, 0);
637 static int nf_tables_updtable(struct nft_ctx
*ctx
)
639 struct nft_trans
*trans
;
643 if (!ctx
->nla
[NFTA_TABLE_FLAGS
])
646 flags
= ntohl(nla_get_be32(ctx
->nla
[NFTA_TABLE_FLAGS
]));
647 if (flags
& ~NFT_TABLE_F_DORMANT
)
650 if (flags
== ctx
->table
->flags
)
653 trans
= nft_trans_alloc(ctx
, NFT_MSG_NEWTABLE
,
654 sizeof(struct nft_trans_table
));
658 if ((flags
& NFT_TABLE_F_DORMANT
) &&
659 !(ctx
->table
->flags
& NFT_TABLE_F_DORMANT
)) {
660 nft_trans_table_enable(trans
) = false;
661 } else if (!(flags
& NFT_TABLE_F_DORMANT
) &&
662 ctx
->table
->flags
& NFT_TABLE_F_DORMANT
) {
663 ret
= nf_tables_table_enable(ctx
->net
, ctx
->afi
, ctx
->table
);
665 ctx
->table
->flags
&= ~NFT_TABLE_F_DORMANT
;
666 nft_trans_table_enable(trans
) = true;
672 nft_trans_table_update(trans
) = true;
673 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
676 nft_trans_destroy(trans
);
680 static int nf_tables_newtable(struct net
*net
, struct sock
*nlsk
,
681 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
682 const struct nlattr
* const nla
[],
683 struct netlink_ext_ack
*extack
)
685 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
686 u8 genmask
= nft_genmask_next(net
);
687 const struct nlattr
*name
;
688 struct nft_af_info
*afi
;
689 struct nft_table
*table
;
690 int family
= nfmsg
->nfgen_family
;
695 afi
= nf_tables_afinfo_lookup(net
, family
, true);
699 name
= nla
[NFTA_TABLE_NAME
];
700 table
= nf_tables_table_lookup(afi
, name
, genmask
);
702 if (PTR_ERR(table
) != -ENOENT
)
703 return PTR_ERR(table
);
705 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
707 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
710 nft_ctx_init(&ctx
, net
, skb
, nlh
, afi
, table
, NULL
, nla
);
711 return nf_tables_updtable(&ctx
);
714 if (nla
[NFTA_TABLE_FLAGS
]) {
715 flags
= ntohl(nla_get_be32(nla
[NFTA_TABLE_FLAGS
]));
716 if (flags
& ~NFT_TABLE_F_DORMANT
)
721 if (!try_module_get(afi
->owner
))
725 table
= kzalloc(sizeof(*table
), GFP_KERNEL
);
729 nla_strlcpy(table
->name
, name
, NFT_TABLE_MAXNAMELEN
);
730 INIT_LIST_HEAD(&table
->chains
);
731 INIT_LIST_HEAD(&table
->sets
);
732 INIT_LIST_HEAD(&table
->objects
);
733 table
->flags
= flags
;
735 nft_ctx_init(&ctx
, net
, skb
, nlh
, afi
, table
, NULL
, nla
);
736 err
= nft_trans_table_add(&ctx
, NFT_MSG_NEWTABLE
);
740 list_add_tail_rcu(&table
->list
, &afi
->tables
);
745 module_put(afi
->owner
);
750 static int nft_flush_table(struct nft_ctx
*ctx
)
753 struct nft_chain
*chain
, *nc
;
754 struct nft_object
*obj
, *ne
;
755 struct nft_set
*set
, *ns
;
757 list_for_each_entry(chain
, &ctx
->table
->chains
, list
) {
758 if (!nft_is_active_next(ctx
->net
, chain
))
763 err
= nft_delrule_by_chain(ctx
);
768 list_for_each_entry_safe(set
, ns
, &ctx
->table
->sets
, list
) {
769 if (!nft_is_active_next(ctx
->net
, set
))
772 if (set
->flags
& NFT_SET_ANONYMOUS
&&
773 !list_empty(&set
->bindings
))
776 err
= nft_delset(ctx
, set
);
781 list_for_each_entry_safe(obj
, ne
, &ctx
->table
->objects
, list
) {
782 err
= nft_delobj(ctx
, obj
);
787 list_for_each_entry_safe(chain
, nc
, &ctx
->table
->chains
, list
) {
788 if (!nft_is_active_next(ctx
->net
, chain
))
793 err
= nft_delchain(ctx
);
798 err
= nft_deltable(ctx
);
803 static int nft_flush(struct nft_ctx
*ctx
, int family
)
805 struct nft_af_info
*afi
;
806 struct nft_table
*table
, *nt
;
807 const struct nlattr
* const *nla
= ctx
->nla
;
810 list_for_each_entry(afi
, &ctx
->net
->nft
.af_info
, list
) {
811 if (family
!= AF_UNSPEC
&& afi
->family
!= family
)
815 list_for_each_entry_safe(table
, nt
, &afi
->tables
, list
) {
816 if (!nft_is_active_next(ctx
->net
, table
))
819 if (nla
[NFTA_TABLE_NAME
] &&
820 nla_strcmp(nla
[NFTA_TABLE_NAME
], table
->name
) != 0)
825 err
= nft_flush_table(ctx
);
834 static int nf_tables_deltable(struct net
*net
, struct sock
*nlsk
,
835 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
836 const struct nlattr
* const nla
[],
837 struct netlink_ext_ack
*extack
)
839 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
840 u8 genmask
= nft_genmask_next(net
);
841 struct nft_af_info
*afi
;
842 struct nft_table
*table
;
843 int family
= nfmsg
->nfgen_family
;
846 nft_ctx_init(&ctx
, net
, skb
, nlh
, NULL
, NULL
, NULL
, nla
);
847 if (family
== AF_UNSPEC
|| nla
[NFTA_TABLE_NAME
] == NULL
)
848 return nft_flush(&ctx
, family
);
850 afi
= nf_tables_afinfo_lookup(net
, family
, false);
854 table
= nf_tables_table_lookup(afi
, nla
[NFTA_TABLE_NAME
], genmask
);
856 return PTR_ERR(table
);
861 return nft_flush_table(&ctx
);
864 static void nf_tables_table_destroy(struct nft_ctx
*ctx
)
866 BUG_ON(ctx
->table
->use
> 0);
869 module_put(ctx
->afi
->owner
);
872 int nft_register_chain_type(const struct nf_chain_type
*ctype
)
876 if (WARN_ON(ctype
->family
>= NFPROTO_NUMPROTO
))
879 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
880 if (chain_type
[ctype
->family
][ctype
->type
] != NULL
) {
884 chain_type
[ctype
->family
][ctype
->type
] = ctype
;
886 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
889 EXPORT_SYMBOL_GPL(nft_register_chain_type
);
891 void nft_unregister_chain_type(const struct nf_chain_type
*ctype
)
893 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
894 chain_type
[ctype
->family
][ctype
->type
] = NULL
;
895 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
897 EXPORT_SYMBOL_GPL(nft_unregister_chain_type
);
903 static struct nft_chain
*
904 nf_tables_chain_lookup_byhandle(const struct nft_table
*table
, u64 handle
,
907 struct nft_chain
*chain
;
909 list_for_each_entry(chain
, &table
->chains
, list
) {
910 if (chain
->handle
== handle
&&
911 nft_active_genmask(chain
, genmask
))
915 return ERR_PTR(-ENOENT
);
918 static struct nft_chain
*nf_tables_chain_lookup(const struct nft_table
*table
,
919 const struct nlattr
*nla
,
922 struct nft_chain
*chain
;
925 return ERR_PTR(-EINVAL
);
927 list_for_each_entry(chain
, &table
->chains
, list
) {
928 if (!nla_strcmp(nla
, chain
->name
) &&
929 nft_active_genmask(chain
, genmask
))
933 return ERR_PTR(-ENOENT
);
936 static const struct nla_policy nft_chain_policy
[NFTA_CHAIN_MAX
+ 1] = {
937 [NFTA_CHAIN_TABLE
] = { .type
= NLA_STRING
,
938 .len
= NFT_TABLE_MAXNAMELEN
- 1 },
939 [NFTA_CHAIN_HANDLE
] = { .type
= NLA_U64
},
940 [NFTA_CHAIN_NAME
] = { .type
= NLA_STRING
,
941 .len
= NFT_CHAIN_MAXNAMELEN
- 1 },
942 [NFTA_CHAIN_HOOK
] = { .type
= NLA_NESTED
},
943 [NFTA_CHAIN_POLICY
] = { .type
= NLA_U32
},
944 [NFTA_CHAIN_TYPE
] = { .type
= NLA_STRING
},
945 [NFTA_CHAIN_COUNTERS
] = { .type
= NLA_NESTED
},
948 static const struct nla_policy nft_hook_policy
[NFTA_HOOK_MAX
+ 1] = {
949 [NFTA_HOOK_HOOKNUM
] = { .type
= NLA_U32
},
950 [NFTA_HOOK_PRIORITY
] = { .type
= NLA_U32
},
951 [NFTA_HOOK_DEV
] = { .type
= NLA_STRING
,
952 .len
= IFNAMSIZ
- 1 },
955 static int nft_dump_stats(struct sk_buff
*skb
, struct nft_stats __percpu
*stats
)
957 struct nft_stats
*cpu_stats
, total
;
963 memset(&total
, 0, sizeof(total
));
964 for_each_possible_cpu(cpu
) {
965 cpu_stats
= per_cpu_ptr(stats
, cpu
);
967 seq
= u64_stats_fetch_begin_irq(&cpu_stats
->syncp
);
968 pkts
= cpu_stats
->pkts
;
969 bytes
= cpu_stats
->bytes
;
970 } while (u64_stats_fetch_retry_irq(&cpu_stats
->syncp
, seq
));
972 total
.bytes
+= bytes
;
974 nest
= nla_nest_start(skb
, NFTA_CHAIN_COUNTERS
);
976 goto nla_put_failure
;
978 if (nla_put_be64(skb
, NFTA_COUNTER_PACKETS
, cpu_to_be64(total
.pkts
),
980 nla_put_be64(skb
, NFTA_COUNTER_BYTES
, cpu_to_be64(total
.bytes
),
982 goto nla_put_failure
;
984 nla_nest_end(skb
, nest
);
991 static int nf_tables_fill_chain_info(struct sk_buff
*skb
, struct net
*net
,
992 u32 portid
, u32 seq
, int event
, u32 flags
,
993 int family
, const struct nft_table
*table
,
994 const struct nft_chain
*chain
)
996 struct nlmsghdr
*nlh
;
997 struct nfgenmsg
*nfmsg
;
999 event
= nfnl_msg_type(NFNL_SUBSYS_NFTABLES
, event
);
1000 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
), flags
);
1002 goto nla_put_failure
;
1004 nfmsg
= nlmsg_data(nlh
);
1005 nfmsg
->nfgen_family
= family
;
1006 nfmsg
->version
= NFNETLINK_V0
;
1007 nfmsg
->res_id
= htons(net
->nft
.base_seq
& 0xffff);
1009 if (nla_put_string(skb
, NFTA_CHAIN_TABLE
, table
->name
))
1010 goto nla_put_failure
;
1011 if (nla_put_be64(skb
, NFTA_CHAIN_HANDLE
, cpu_to_be64(chain
->handle
),
1013 goto nla_put_failure
;
1014 if (nla_put_string(skb
, NFTA_CHAIN_NAME
, chain
->name
))
1015 goto nla_put_failure
;
1017 if (nft_is_base_chain(chain
)) {
1018 const struct nft_base_chain
*basechain
= nft_base_chain(chain
);
1019 const struct nf_hook_ops
*ops
= &basechain
->ops
[0];
1020 struct nlattr
*nest
;
1022 nest
= nla_nest_start(skb
, NFTA_CHAIN_HOOK
);
1024 goto nla_put_failure
;
1025 if (nla_put_be32(skb
, NFTA_HOOK_HOOKNUM
, htonl(ops
->hooknum
)))
1026 goto nla_put_failure
;
1027 if (nla_put_be32(skb
, NFTA_HOOK_PRIORITY
, htonl(ops
->priority
)))
1028 goto nla_put_failure
;
1029 if (basechain
->dev_name
[0] &&
1030 nla_put_string(skb
, NFTA_HOOK_DEV
, basechain
->dev_name
))
1031 goto nla_put_failure
;
1032 nla_nest_end(skb
, nest
);
1034 if (nla_put_be32(skb
, NFTA_CHAIN_POLICY
,
1035 htonl(basechain
->policy
)))
1036 goto nla_put_failure
;
1038 if (nla_put_string(skb
, NFTA_CHAIN_TYPE
, basechain
->type
->name
))
1039 goto nla_put_failure
;
1041 if (nft_dump_stats(skb
, nft_base_chain(chain
)->stats
))
1042 goto nla_put_failure
;
1045 if (nla_put_be32(skb
, NFTA_CHAIN_USE
, htonl(chain
->use
)))
1046 goto nla_put_failure
;
1048 nlmsg_end(skb
, nlh
);
1052 nlmsg_trim(skb
, nlh
);
1056 static void nf_tables_chain_notify(const struct nft_ctx
*ctx
, int event
)
1058 struct sk_buff
*skb
;
1062 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
1065 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
1069 err
= nf_tables_fill_chain_info(skb
, ctx
->net
, ctx
->portid
, ctx
->seq
,
1070 event
, 0, ctx
->afi
->family
, ctx
->table
,
1077 nfnetlink_send(skb
, ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
1078 ctx
->report
, GFP_KERNEL
);
1081 nfnetlink_set_err(ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
, -ENOBUFS
);
1084 static int nf_tables_dump_chains(struct sk_buff
*skb
,
1085 struct netlink_callback
*cb
)
1087 const struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
1088 const struct nft_af_info
*afi
;
1089 const struct nft_table
*table
;
1090 const struct nft_chain
*chain
;
1091 unsigned int idx
= 0, s_idx
= cb
->args
[0];
1092 struct net
*net
= sock_net(skb
->sk
);
1093 int family
= nfmsg
->nfgen_family
;
1096 cb
->seq
= net
->nft
.base_seq
;
1098 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
1099 if (family
!= NFPROTO_UNSPEC
&& family
!= afi
->family
)
1102 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
1103 list_for_each_entry_rcu(chain
, &table
->chains
, list
) {
1107 memset(&cb
->args
[1], 0,
1108 sizeof(cb
->args
) - sizeof(cb
->args
[0]));
1109 if (!nft_is_active(net
, chain
))
1111 if (nf_tables_fill_chain_info(skb
, net
,
1112 NETLINK_CB(cb
->skb
).portid
,
1116 afi
->family
, table
, chain
) < 0)
1119 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
1131 static int nf_tables_getchain(struct net
*net
, struct sock
*nlsk
,
1132 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
1133 const struct nlattr
* const nla
[],
1134 struct netlink_ext_ack
*extack
)
1136 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1137 u8 genmask
= nft_genmask_cur(net
);
1138 const struct nft_af_info
*afi
;
1139 const struct nft_table
*table
;
1140 const struct nft_chain
*chain
;
1141 struct sk_buff
*skb2
;
1142 int family
= nfmsg
->nfgen_family
;
1145 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1146 struct netlink_dump_control c
= {
1147 .dump
= nf_tables_dump_chains
,
1149 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
1152 afi
= nf_tables_afinfo_lookup(net
, family
, false);
1154 return PTR_ERR(afi
);
1156 table
= nf_tables_table_lookup(afi
, nla
[NFTA_CHAIN_TABLE
], genmask
);
1158 return PTR_ERR(table
);
1160 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_CHAIN_NAME
], genmask
);
1162 return PTR_ERR(chain
);
1164 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1168 err
= nf_tables_fill_chain_info(skb2
, net
, NETLINK_CB(skb
).portid
,
1169 nlh
->nlmsg_seq
, NFT_MSG_NEWCHAIN
, 0,
1170 family
, table
, chain
);
1174 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
1181 static const struct nla_policy nft_counter_policy
[NFTA_COUNTER_MAX
+ 1] = {
1182 [NFTA_COUNTER_PACKETS
] = { .type
= NLA_U64
},
1183 [NFTA_COUNTER_BYTES
] = { .type
= NLA_U64
},
1186 static struct nft_stats __percpu
*nft_stats_alloc(const struct nlattr
*attr
)
1188 struct nlattr
*tb
[NFTA_COUNTER_MAX
+1];
1189 struct nft_stats __percpu
*newstats
;
1190 struct nft_stats
*stats
;
1193 err
= nla_parse_nested(tb
, NFTA_COUNTER_MAX
, attr
, nft_counter_policy
,
1196 return ERR_PTR(err
);
1198 if (!tb
[NFTA_COUNTER_BYTES
] || !tb
[NFTA_COUNTER_PACKETS
])
1199 return ERR_PTR(-EINVAL
);
1201 newstats
= netdev_alloc_pcpu_stats(struct nft_stats
);
1202 if (newstats
== NULL
)
1203 return ERR_PTR(-ENOMEM
);
1205 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1206 * are not exposed to userspace.
1209 stats
= this_cpu_ptr(newstats
);
1210 stats
->bytes
= be64_to_cpu(nla_get_be64(tb
[NFTA_COUNTER_BYTES
]));
1211 stats
->pkts
= be64_to_cpu(nla_get_be64(tb
[NFTA_COUNTER_PACKETS
]));
1217 static void nft_chain_stats_replace(struct nft_base_chain
*chain
,
1218 struct nft_stats __percpu
*newstats
)
1220 if (newstats
== NULL
)
1224 struct nft_stats __percpu
*oldstats
=
1225 nft_dereference(chain
->stats
);
1227 rcu_assign_pointer(chain
->stats
, newstats
);
1229 free_percpu(oldstats
);
1231 rcu_assign_pointer(chain
->stats
, newstats
);
1234 static void nf_tables_chain_destroy(struct nft_chain
*chain
)
1236 BUG_ON(chain
->use
> 0);
1238 if (nft_is_base_chain(chain
)) {
1239 struct nft_base_chain
*basechain
= nft_base_chain(chain
);
1241 module_put(basechain
->type
->owner
);
1242 free_percpu(basechain
->stats
);
1243 if (basechain
->ops
[0].dev
!= NULL
)
1244 dev_put(basechain
->ops
[0].dev
);
1251 struct nft_chain_hook
{
1254 const struct nf_chain_type
*type
;
1255 struct net_device
*dev
;
1258 static int nft_chain_parse_hook(struct net
*net
,
1259 const struct nlattr
* const nla
[],
1260 struct nft_af_info
*afi
,
1261 struct nft_chain_hook
*hook
, bool create
)
1263 struct nlattr
*ha
[NFTA_HOOK_MAX
+ 1];
1264 const struct nf_chain_type
*type
;
1265 struct net_device
*dev
;
1268 err
= nla_parse_nested(ha
, NFTA_HOOK_MAX
, nla
[NFTA_CHAIN_HOOK
],
1269 nft_hook_policy
, NULL
);
1273 if (ha
[NFTA_HOOK_HOOKNUM
] == NULL
||
1274 ha
[NFTA_HOOK_PRIORITY
] == NULL
)
1277 hook
->num
= ntohl(nla_get_be32(ha
[NFTA_HOOK_HOOKNUM
]));
1278 if (hook
->num
>= afi
->nhooks
)
1281 hook
->priority
= ntohl(nla_get_be32(ha
[NFTA_HOOK_PRIORITY
]));
1283 type
= chain_type
[afi
->family
][NFT_CHAIN_T_DEFAULT
];
1284 if (nla
[NFTA_CHAIN_TYPE
]) {
1285 type
= nf_tables_chain_type_lookup(afi
, nla
[NFTA_CHAIN_TYPE
],
1288 return PTR_ERR(type
);
1290 if (!(type
->hook_mask
& (1 << hook
->num
)))
1292 if (!try_module_get(type
->owner
))
1298 if (afi
->flags
& NFT_AF_NEEDS_DEV
) {
1299 char ifname
[IFNAMSIZ
];
1301 if (!ha
[NFTA_HOOK_DEV
]) {
1302 module_put(type
->owner
);
1306 nla_strlcpy(ifname
, ha
[NFTA_HOOK_DEV
], IFNAMSIZ
);
1307 dev
= dev_get_by_name(net
, ifname
);
1309 module_put(type
->owner
);
1313 } else if (ha
[NFTA_HOOK_DEV
]) {
1314 module_put(type
->owner
);
1321 static void nft_chain_release_hook(struct nft_chain_hook
*hook
)
1323 module_put(hook
->type
->owner
);
1324 if (hook
->dev
!= NULL
)
1328 static int nf_tables_newchain(struct net
*net
, struct sock
*nlsk
,
1329 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
1330 const struct nlattr
* const nla
[],
1331 struct netlink_ext_ack
*extack
)
1333 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1334 const struct nlattr
* uninitialized_var(name
);
1335 struct nft_af_info
*afi
;
1336 struct nft_table
*table
;
1337 struct nft_chain
*chain
;
1338 struct nft_base_chain
*basechain
= NULL
;
1339 u8 genmask
= nft_genmask_next(net
);
1340 int family
= nfmsg
->nfgen_family
;
1341 u8 policy
= NF_ACCEPT
;
1344 struct nft_stats __percpu
*stats
;
1349 create
= nlh
->nlmsg_flags
& NLM_F_CREATE
? true : false;
1351 afi
= nf_tables_afinfo_lookup(net
, family
, true);
1353 return PTR_ERR(afi
);
1355 table
= nf_tables_table_lookup(afi
, nla
[NFTA_CHAIN_TABLE
], genmask
);
1357 return PTR_ERR(table
);
1360 name
= nla
[NFTA_CHAIN_NAME
];
1362 if (nla
[NFTA_CHAIN_HANDLE
]) {
1363 handle
= be64_to_cpu(nla_get_be64(nla
[NFTA_CHAIN_HANDLE
]));
1364 chain
= nf_tables_chain_lookup_byhandle(table
, handle
, genmask
);
1366 return PTR_ERR(chain
);
1368 chain
= nf_tables_chain_lookup(table
, name
, genmask
);
1369 if (IS_ERR(chain
)) {
1370 if (PTR_ERR(chain
) != -ENOENT
)
1371 return PTR_ERR(chain
);
1376 if (nla
[NFTA_CHAIN_POLICY
]) {
1377 if (chain
!= NULL
&&
1378 !nft_is_base_chain(chain
))
1381 if (chain
== NULL
&&
1382 nla
[NFTA_CHAIN_HOOK
] == NULL
)
1385 policy
= ntohl(nla_get_be32(nla
[NFTA_CHAIN_POLICY
]));
1395 if (chain
!= NULL
) {
1396 struct nft_stats
*stats
= NULL
;
1397 struct nft_trans
*trans
;
1399 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
1401 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
1404 if (nla
[NFTA_CHAIN_HOOK
]) {
1405 struct nft_base_chain
*basechain
;
1406 struct nft_chain_hook hook
;
1407 struct nf_hook_ops
*ops
;
1409 if (!nft_is_base_chain(chain
))
1412 err
= nft_chain_parse_hook(net
, nla
, afi
, &hook
,
1417 basechain
= nft_base_chain(chain
);
1418 if (basechain
->type
!= hook
.type
) {
1419 nft_chain_release_hook(&hook
);
1423 for (i
= 0; i
< afi
->nops
; i
++) {
1424 ops
= &basechain
->ops
[i
];
1425 if (ops
->hooknum
!= hook
.num
||
1426 ops
->priority
!= hook
.priority
||
1427 ops
->dev
!= hook
.dev
) {
1428 nft_chain_release_hook(&hook
);
1432 nft_chain_release_hook(&hook
);
1435 if (nla
[NFTA_CHAIN_HANDLE
] && name
) {
1436 struct nft_chain
*chain2
;
1438 chain2
= nf_tables_chain_lookup(table
,
1439 nla
[NFTA_CHAIN_NAME
],
1442 return PTR_ERR(chain2
);
1445 if (nla
[NFTA_CHAIN_COUNTERS
]) {
1446 if (!nft_is_base_chain(chain
))
1449 stats
= nft_stats_alloc(nla
[NFTA_CHAIN_COUNTERS
]);
1451 return PTR_ERR(stats
);
1454 nft_ctx_init(&ctx
, net
, skb
, nlh
, afi
, table
, chain
, nla
);
1455 trans
= nft_trans_alloc(&ctx
, NFT_MSG_NEWCHAIN
,
1456 sizeof(struct nft_trans_chain
));
1457 if (trans
== NULL
) {
1462 nft_trans_chain_stats(trans
) = stats
;
1463 nft_trans_chain_update(trans
) = true;
1465 if (nla
[NFTA_CHAIN_POLICY
])
1466 nft_trans_chain_policy(trans
) = policy
;
1468 nft_trans_chain_policy(trans
) = -1;
1470 if (nla
[NFTA_CHAIN_HANDLE
] && name
) {
1471 nla_strlcpy(nft_trans_chain_name(trans
), name
,
1472 NFT_CHAIN_MAXNAMELEN
);
1474 list_add_tail(&trans
->list
, &net
->nft
.commit_list
);
1478 if (table
->use
== UINT_MAX
)
1481 if (nla
[NFTA_CHAIN_HOOK
]) {
1482 struct nft_chain_hook hook
;
1483 struct nf_hook_ops
*ops
;
1486 err
= nft_chain_parse_hook(net
, nla
, afi
, &hook
, create
);
1490 basechain
= kzalloc(sizeof(*basechain
), GFP_KERNEL
);
1491 if (basechain
== NULL
) {
1492 nft_chain_release_hook(&hook
);
1496 if (hook
.dev
!= NULL
)
1497 strncpy(basechain
->dev_name
, hook
.dev
->name
, IFNAMSIZ
);
1499 if (nla
[NFTA_CHAIN_COUNTERS
]) {
1500 stats
= nft_stats_alloc(nla
[NFTA_CHAIN_COUNTERS
]);
1501 if (IS_ERR(stats
)) {
1502 nft_chain_release_hook(&hook
);
1504 return PTR_ERR(stats
);
1506 basechain
->stats
= stats
;
1508 stats
= netdev_alloc_pcpu_stats(struct nft_stats
);
1509 if (stats
== NULL
) {
1510 nft_chain_release_hook(&hook
);
1514 rcu_assign_pointer(basechain
->stats
, stats
);
1517 hookfn
= hook
.type
->hooks
[hook
.num
];
1518 basechain
->type
= hook
.type
;
1519 chain
= &basechain
->chain
;
1521 for (i
= 0; i
< afi
->nops
; i
++) {
1522 ops
= &basechain
->ops
[i
];
1524 ops
->hooknum
= hook
.num
;
1525 ops
->priority
= hook
.priority
;
1527 ops
->hook
= afi
->hooks
[ops
->hooknum
];
1528 ops
->dev
= hook
.dev
;
1531 if (afi
->hook_ops_init
)
1532 afi
->hook_ops_init(ops
, i
);
1535 chain
->flags
|= NFT_BASE_CHAIN
;
1536 basechain
->policy
= policy
;
1538 chain
= kzalloc(sizeof(*chain
), GFP_KERNEL
);
1543 INIT_LIST_HEAD(&chain
->rules
);
1544 chain
->handle
= nf_tables_alloc_handle(table
);
1545 chain
->table
= table
;
1546 nla_strlcpy(chain
->name
, name
, NFT_CHAIN_MAXNAMELEN
);
1548 err
= nf_tables_register_hooks(net
, table
, chain
, afi
->nops
);
1552 nft_ctx_init(&ctx
, net
, skb
, nlh
, afi
, table
, chain
, nla
);
1553 err
= nft_trans_chain_add(&ctx
, NFT_MSG_NEWCHAIN
);
1558 list_add_tail_rcu(&chain
->list
, &table
->chains
);
1561 nf_tables_unregister_hooks(net
, table
, chain
, afi
->nops
);
1563 nf_tables_chain_destroy(chain
);
1567 static int nf_tables_delchain(struct net
*net
, struct sock
*nlsk
,
1568 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
1569 const struct nlattr
* const nla
[],
1570 struct netlink_ext_ack
*extack
)
1572 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1573 u8 genmask
= nft_genmask_next(net
);
1574 struct nft_af_info
*afi
;
1575 struct nft_table
*table
;
1576 struct nft_chain
*chain
;
1577 int family
= nfmsg
->nfgen_family
;
1580 afi
= nf_tables_afinfo_lookup(net
, family
, false);
1582 return PTR_ERR(afi
);
1584 table
= nf_tables_table_lookup(afi
, nla
[NFTA_CHAIN_TABLE
], genmask
);
1586 return PTR_ERR(table
);
1588 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_CHAIN_NAME
], genmask
);
1590 return PTR_ERR(chain
);
1594 nft_ctx_init(&ctx
, net
, skb
, nlh
, afi
, table
, chain
, nla
);
1596 return nft_delchain(&ctx
);
1604 * nft_register_expr - register nf_tables expr type
1607 * Registers the expr type for use with nf_tables. Returns zero on
1608 * success or a negative errno code otherwise.
1610 int nft_register_expr(struct nft_expr_type
*type
)
1612 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1613 if (type
->family
== NFPROTO_UNSPEC
)
1614 list_add_tail_rcu(&type
->list
, &nf_tables_expressions
);
1616 list_add_rcu(&type
->list
, &nf_tables_expressions
);
1617 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1620 EXPORT_SYMBOL_GPL(nft_register_expr
);
1623 * nft_unregister_expr - unregister nf_tables expr type
1626 * Unregisters the expr typefor use with nf_tables.
1628 void nft_unregister_expr(struct nft_expr_type
*type
)
1630 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1631 list_del_rcu(&type
->list
);
1632 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1634 EXPORT_SYMBOL_GPL(nft_unregister_expr
);
1636 static const struct nft_expr_type
*__nft_expr_type_get(u8 family
,
1639 const struct nft_expr_type
*type
;
1641 list_for_each_entry(type
, &nf_tables_expressions
, list
) {
1642 if (!nla_strcmp(nla
, type
->name
) &&
1643 (!type
->family
|| type
->family
== family
))
1649 static const struct nft_expr_type
*nft_expr_type_get(u8 family
,
1652 const struct nft_expr_type
*type
;
1655 return ERR_PTR(-EINVAL
);
1657 type
= __nft_expr_type_get(family
, nla
);
1658 if (type
!= NULL
&& try_module_get(type
->owner
))
1661 #ifdef CONFIG_MODULES
1663 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1664 request_module("nft-expr-%u-%.*s", family
,
1665 nla_len(nla
), (char *)nla_data(nla
));
1666 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1667 if (__nft_expr_type_get(family
, nla
))
1668 return ERR_PTR(-EAGAIN
);
1670 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1671 request_module("nft-expr-%.*s",
1672 nla_len(nla
), (char *)nla_data(nla
));
1673 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1674 if (__nft_expr_type_get(family
, nla
))
1675 return ERR_PTR(-EAGAIN
);
1678 return ERR_PTR(-ENOENT
);
1681 static const struct nla_policy nft_expr_policy
[NFTA_EXPR_MAX
+ 1] = {
1682 [NFTA_EXPR_NAME
] = { .type
= NLA_STRING
},
1683 [NFTA_EXPR_DATA
] = { .type
= NLA_NESTED
},
1686 static int nf_tables_fill_expr_info(struct sk_buff
*skb
,
1687 const struct nft_expr
*expr
)
1689 if (nla_put_string(skb
, NFTA_EXPR_NAME
, expr
->ops
->type
->name
))
1690 goto nla_put_failure
;
1692 if (expr
->ops
->dump
) {
1693 struct nlattr
*data
= nla_nest_start(skb
, NFTA_EXPR_DATA
);
1695 goto nla_put_failure
;
1696 if (expr
->ops
->dump(skb
, expr
) < 0)
1697 goto nla_put_failure
;
1698 nla_nest_end(skb
, data
);
1707 int nft_expr_dump(struct sk_buff
*skb
, unsigned int attr
,
1708 const struct nft_expr
*expr
)
1710 struct nlattr
*nest
;
1712 nest
= nla_nest_start(skb
, attr
);
1714 goto nla_put_failure
;
1715 if (nf_tables_fill_expr_info(skb
, expr
) < 0)
1716 goto nla_put_failure
;
1717 nla_nest_end(skb
, nest
);
1724 struct nft_expr_info
{
1725 const struct nft_expr_ops
*ops
;
1726 struct nlattr
*tb
[NFT_EXPR_MAXATTR
+ 1];
1729 static int nf_tables_expr_parse(const struct nft_ctx
*ctx
,
1730 const struct nlattr
*nla
,
1731 struct nft_expr_info
*info
)
1733 const struct nft_expr_type
*type
;
1734 const struct nft_expr_ops
*ops
;
1735 struct nlattr
*tb
[NFTA_EXPR_MAX
+ 1];
1738 err
= nla_parse_nested(tb
, NFTA_EXPR_MAX
, nla
, nft_expr_policy
, NULL
);
1742 type
= nft_expr_type_get(ctx
->afi
->family
, tb
[NFTA_EXPR_NAME
]);
1744 return PTR_ERR(type
);
1746 if (tb
[NFTA_EXPR_DATA
]) {
1747 err
= nla_parse_nested(info
->tb
, type
->maxattr
,
1748 tb
[NFTA_EXPR_DATA
], type
->policy
, NULL
);
1752 memset(info
->tb
, 0, sizeof(info
->tb
[0]) * (type
->maxattr
+ 1));
1754 if (type
->select_ops
!= NULL
) {
1755 ops
= type
->select_ops(ctx
,
1756 (const struct nlattr
* const *)info
->tb
);
1768 module_put(type
->owner
);
1772 static int nf_tables_newexpr(const struct nft_ctx
*ctx
,
1773 const struct nft_expr_info
*info
,
1774 struct nft_expr
*expr
)
1776 const struct nft_expr_ops
*ops
= info
->ops
;
1781 err
= ops
->init(ctx
, expr
, (const struct nlattr
**)info
->tb
);
1786 if (ops
->validate
) {
1787 const struct nft_data
*data
= NULL
;
1789 err
= ops
->validate(ctx
, expr
, &data
);
1798 ops
->destroy(ctx
, expr
);
1804 static void nf_tables_expr_destroy(const struct nft_ctx
*ctx
,
1805 struct nft_expr
*expr
)
1807 if (expr
->ops
->destroy
)
1808 expr
->ops
->destroy(ctx
, expr
);
1809 module_put(expr
->ops
->type
->owner
);
1812 struct nft_expr
*nft_expr_init(const struct nft_ctx
*ctx
,
1813 const struct nlattr
*nla
)
1815 struct nft_expr_info info
;
1816 struct nft_expr
*expr
;
1819 err
= nf_tables_expr_parse(ctx
, nla
, &info
);
1824 expr
= kzalloc(info
.ops
->size
, GFP_KERNEL
);
1828 err
= nf_tables_newexpr(ctx
, &info
, expr
);
1836 module_put(info
.ops
->type
->owner
);
1838 return ERR_PTR(err
);
1841 void nft_expr_destroy(const struct nft_ctx
*ctx
, struct nft_expr
*expr
)
1843 nf_tables_expr_destroy(ctx
, expr
);
1851 static struct nft_rule
*__nf_tables_rule_lookup(const struct nft_chain
*chain
,
1854 struct nft_rule
*rule
;
1856 // FIXME: this sucks
1857 list_for_each_entry(rule
, &chain
->rules
, list
) {
1858 if (handle
== rule
->handle
)
1862 return ERR_PTR(-ENOENT
);
1865 static struct nft_rule
*nf_tables_rule_lookup(const struct nft_chain
*chain
,
1866 const struct nlattr
*nla
)
1869 return ERR_PTR(-EINVAL
);
1871 return __nf_tables_rule_lookup(chain
, be64_to_cpu(nla_get_be64(nla
)));
1874 static const struct nla_policy nft_rule_policy
[NFTA_RULE_MAX
+ 1] = {
1875 [NFTA_RULE_TABLE
] = { .type
= NLA_STRING
,
1876 .len
= NFT_TABLE_MAXNAMELEN
- 1 },
1877 [NFTA_RULE_CHAIN
] = { .type
= NLA_STRING
,
1878 .len
= NFT_CHAIN_MAXNAMELEN
- 1 },
1879 [NFTA_RULE_HANDLE
] = { .type
= NLA_U64
},
1880 [NFTA_RULE_EXPRESSIONS
] = { .type
= NLA_NESTED
},
1881 [NFTA_RULE_COMPAT
] = { .type
= NLA_NESTED
},
1882 [NFTA_RULE_POSITION
] = { .type
= NLA_U64
},
1883 [NFTA_RULE_USERDATA
] = { .type
= NLA_BINARY
,
1884 .len
= NFT_USERDATA_MAXLEN
},
1887 static int nf_tables_fill_rule_info(struct sk_buff
*skb
, struct net
*net
,
1888 u32 portid
, u32 seq
, int event
,
1889 u32 flags
, int family
,
1890 const struct nft_table
*table
,
1891 const struct nft_chain
*chain
,
1892 const struct nft_rule
*rule
)
1894 struct nlmsghdr
*nlh
;
1895 struct nfgenmsg
*nfmsg
;
1896 const struct nft_expr
*expr
, *next
;
1897 struct nlattr
*list
;
1898 const struct nft_rule
*prule
;
1899 u16 type
= nfnl_msg_type(NFNL_SUBSYS_NFTABLES
, event
);
1901 nlh
= nlmsg_put(skb
, portid
, seq
, type
, sizeof(struct nfgenmsg
), flags
);
1903 goto nla_put_failure
;
1905 nfmsg
= nlmsg_data(nlh
);
1906 nfmsg
->nfgen_family
= family
;
1907 nfmsg
->version
= NFNETLINK_V0
;
1908 nfmsg
->res_id
= htons(net
->nft
.base_seq
& 0xffff);
1910 if (nla_put_string(skb
, NFTA_RULE_TABLE
, table
->name
))
1911 goto nla_put_failure
;
1912 if (nla_put_string(skb
, NFTA_RULE_CHAIN
, chain
->name
))
1913 goto nla_put_failure
;
1914 if (nla_put_be64(skb
, NFTA_RULE_HANDLE
, cpu_to_be64(rule
->handle
),
1916 goto nla_put_failure
;
1918 if ((event
!= NFT_MSG_DELRULE
) && (rule
->list
.prev
!= &chain
->rules
)) {
1919 prule
= list_prev_entry(rule
, list
);
1920 if (nla_put_be64(skb
, NFTA_RULE_POSITION
,
1921 cpu_to_be64(prule
->handle
),
1923 goto nla_put_failure
;
1926 list
= nla_nest_start(skb
, NFTA_RULE_EXPRESSIONS
);
1928 goto nla_put_failure
;
1929 nft_rule_for_each_expr(expr
, next
, rule
) {
1930 if (nft_expr_dump(skb
, NFTA_LIST_ELEM
, expr
) < 0)
1931 goto nla_put_failure
;
1933 nla_nest_end(skb
, list
);
1936 struct nft_userdata
*udata
= nft_userdata(rule
);
1937 if (nla_put(skb
, NFTA_RULE_USERDATA
, udata
->len
+ 1,
1939 goto nla_put_failure
;
1942 nlmsg_end(skb
, nlh
);
1946 nlmsg_trim(skb
, nlh
);
1950 static void nf_tables_rule_notify(const struct nft_ctx
*ctx
,
1951 const struct nft_rule
*rule
, int event
)
1953 struct sk_buff
*skb
;
1957 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
1960 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
1964 err
= nf_tables_fill_rule_info(skb
, ctx
->net
, ctx
->portid
, ctx
->seq
,
1965 event
, 0, ctx
->afi
->family
, ctx
->table
,
1972 nfnetlink_send(skb
, ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
1973 ctx
->report
, GFP_KERNEL
);
1976 nfnetlink_set_err(ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
, -ENOBUFS
);
1979 struct nft_rule_dump_ctx
{
1980 char table
[NFT_TABLE_MAXNAMELEN
];
1981 char chain
[NFT_CHAIN_MAXNAMELEN
];
1984 static int nf_tables_dump_rules(struct sk_buff
*skb
,
1985 struct netlink_callback
*cb
)
1987 const struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
1988 const struct nft_rule_dump_ctx
*ctx
= cb
->data
;
1989 const struct nft_af_info
*afi
;
1990 const struct nft_table
*table
;
1991 const struct nft_chain
*chain
;
1992 const struct nft_rule
*rule
;
1993 unsigned int idx
= 0, s_idx
= cb
->args
[0];
1994 struct net
*net
= sock_net(skb
->sk
);
1995 int family
= nfmsg
->nfgen_family
;
1998 cb
->seq
= net
->nft
.base_seq
;
2000 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
2001 if (family
!= NFPROTO_UNSPEC
&& family
!= afi
->family
)
2004 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
2005 if (ctx
&& ctx
->table
[0] &&
2006 strcmp(ctx
->table
, table
->name
) != 0)
2009 list_for_each_entry_rcu(chain
, &table
->chains
, list
) {
2010 if (ctx
&& ctx
->chain
[0] &&
2011 strcmp(ctx
->chain
, chain
->name
) != 0)
2014 list_for_each_entry_rcu(rule
, &chain
->rules
, list
) {
2015 if (!nft_is_active(net
, rule
))
2020 memset(&cb
->args
[1], 0,
2021 sizeof(cb
->args
) - sizeof(cb
->args
[0]));
2022 if (nf_tables_fill_rule_info(skb
, net
, NETLINK_CB(cb
->skb
).portid
,
2025 NLM_F_MULTI
| NLM_F_APPEND
,
2026 afi
->family
, table
, chain
, rule
) < 0)
2029 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
2043 static int nf_tables_dump_rules_done(struct netlink_callback
*cb
)
2049 static int nf_tables_getrule(struct net
*net
, struct sock
*nlsk
,
2050 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
2051 const struct nlattr
* const nla
[],
2052 struct netlink_ext_ack
*extack
)
2054 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2055 u8 genmask
= nft_genmask_cur(net
);
2056 const struct nft_af_info
*afi
;
2057 const struct nft_table
*table
;
2058 const struct nft_chain
*chain
;
2059 const struct nft_rule
*rule
;
2060 struct sk_buff
*skb2
;
2061 int family
= nfmsg
->nfgen_family
;
2064 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
2065 struct netlink_dump_control c
= {
2066 .dump
= nf_tables_dump_rules
,
2067 .done
= nf_tables_dump_rules_done
,
2070 if (nla
[NFTA_RULE_TABLE
] || nla
[NFTA_RULE_CHAIN
]) {
2071 struct nft_rule_dump_ctx
*ctx
;
2073 ctx
= kzalloc(sizeof(*ctx
), GFP_KERNEL
);
2077 if (nla
[NFTA_RULE_TABLE
])
2078 nla_strlcpy(ctx
->table
, nla
[NFTA_RULE_TABLE
],
2079 sizeof(ctx
->table
));
2080 if (nla
[NFTA_RULE_CHAIN
])
2081 nla_strlcpy(ctx
->chain
, nla
[NFTA_RULE_CHAIN
],
2082 sizeof(ctx
->chain
));
2086 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
2089 afi
= nf_tables_afinfo_lookup(net
, family
, false);
2091 return PTR_ERR(afi
);
2093 table
= nf_tables_table_lookup(afi
, nla
[NFTA_RULE_TABLE
], genmask
);
2095 return PTR_ERR(table
);
2097 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_RULE_CHAIN
], genmask
);
2099 return PTR_ERR(chain
);
2101 rule
= nf_tables_rule_lookup(chain
, nla
[NFTA_RULE_HANDLE
]);
2103 return PTR_ERR(rule
);
2105 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
2109 err
= nf_tables_fill_rule_info(skb2
, net
, NETLINK_CB(skb
).portid
,
2110 nlh
->nlmsg_seq
, NFT_MSG_NEWRULE
, 0,
2111 family
, table
, chain
, rule
);
2115 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
2122 static void nf_tables_rule_destroy(const struct nft_ctx
*ctx
,
2123 struct nft_rule
*rule
)
2125 struct nft_expr
*expr
;
2128 * Careful: some expressions might not be initialized in case this
2129 * is called on error from nf_tables_newrule().
2131 expr
= nft_expr_first(rule
);
2132 while (expr
!= nft_expr_last(rule
) && expr
->ops
) {
2133 nf_tables_expr_destroy(ctx
, expr
);
2134 expr
= nft_expr_next(expr
);
2139 #define NFT_RULE_MAXEXPRS 128
2141 static struct nft_expr_info
*info
;
2143 static int nf_tables_newrule(struct net
*net
, struct sock
*nlsk
,
2144 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
2145 const struct nlattr
* const nla
[],
2146 struct netlink_ext_ack
*extack
)
2148 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2149 u8 genmask
= nft_genmask_next(net
);
2150 struct nft_af_info
*afi
;
2151 struct nft_table
*table
;
2152 struct nft_chain
*chain
;
2153 struct nft_rule
*rule
, *old_rule
= NULL
;
2154 struct nft_userdata
*udata
;
2155 struct nft_trans
*trans
= NULL
;
2156 struct nft_expr
*expr
;
2159 unsigned int size
, i
, n
, ulen
= 0, usize
= 0;
2162 u64 handle
, pos_handle
;
2164 create
= nlh
->nlmsg_flags
& NLM_F_CREATE
? true : false;
2166 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, create
);
2168 return PTR_ERR(afi
);
2170 table
= nf_tables_table_lookup(afi
, nla
[NFTA_RULE_TABLE
], genmask
);
2172 return PTR_ERR(table
);
2174 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_RULE_CHAIN
], genmask
);
2176 return PTR_ERR(chain
);
2178 if (nla
[NFTA_RULE_HANDLE
]) {
2179 handle
= be64_to_cpu(nla_get_be64(nla
[NFTA_RULE_HANDLE
]));
2180 rule
= __nf_tables_rule_lookup(chain
, handle
);
2182 return PTR_ERR(rule
);
2184 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
2186 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
2191 if (!create
|| nlh
->nlmsg_flags
& NLM_F_REPLACE
)
2193 handle
= nf_tables_alloc_handle(table
);
2195 if (chain
->use
== UINT_MAX
)
2199 if (nla
[NFTA_RULE_POSITION
]) {
2200 if (!(nlh
->nlmsg_flags
& NLM_F_CREATE
))
2203 pos_handle
= be64_to_cpu(nla_get_be64(nla
[NFTA_RULE_POSITION
]));
2204 old_rule
= __nf_tables_rule_lookup(chain
, pos_handle
);
2205 if (IS_ERR(old_rule
))
2206 return PTR_ERR(old_rule
);
2209 nft_ctx_init(&ctx
, net
, skb
, nlh
, afi
, table
, chain
, nla
);
2213 if (nla
[NFTA_RULE_EXPRESSIONS
]) {
2214 nla_for_each_nested(tmp
, nla
[NFTA_RULE_EXPRESSIONS
], rem
) {
2216 if (nla_type(tmp
) != NFTA_LIST_ELEM
)
2218 if (n
== NFT_RULE_MAXEXPRS
)
2220 err
= nf_tables_expr_parse(&ctx
, tmp
, &info
[n
]);
2223 size
+= info
[n
].ops
->size
;
2227 /* Check for overflow of dlen field */
2229 if (size
>= 1 << 12)
2232 if (nla
[NFTA_RULE_USERDATA
]) {
2233 ulen
= nla_len(nla
[NFTA_RULE_USERDATA
]);
2235 usize
= sizeof(struct nft_userdata
) + ulen
;
2239 rule
= kzalloc(sizeof(*rule
) + size
+ usize
, GFP_KERNEL
);
2243 nft_activate_next(net
, rule
);
2245 rule
->handle
= handle
;
2247 rule
->udata
= ulen
? 1 : 0;
2250 udata
= nft_userdata(rule
);
2251 udata
->len
= ulen
- 1;
2252 nla_memcpy(udata
->data
, nla
[NFTA_RULE_USERDATA
], ulen
);
2255 expr
= nft_expr_first(rule
);
2256 for (i
= 0; i
< n
; i
++) {
2257 err
= nf_tables_newexpr(&ctx
, &info
[i
], expr
);
2261 expr
= nft_expr_next(expr
);
2264 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
) {
2265 if (nft_is_active_next(net
, old_rule
)) {
2266 trans
= nft_trans_rule_add(&ctx
, NFT_MSG_DELRULE
,
2268 if (trans
== NULL
) {
2272 nft_deactivate_next(net
, old_rule
);
2274 list_add_tail_rcu(&rule
->list
, &old_rule
->list
);
2279 } else if (nlh
->nlmsg_flags
& NLM_F_APPEND
)
2281 list_add_rcu(&rule
->list
, &old_rule
->list
);
2283 list_add_tail_rcu(&rule
->list
, &chain
->rules
);
2286 list_add_tail_rcu(&rule
->list
, &old_rule
->list
);
2288 list_add_rcu(&rule
->list
, &chain
->rules
);
2291 if (nft_trans_rule_add(&ctx
, NFT_MSG_NEWRULE
, rule
) == NULL
) {
2299 list_del_rcu(&rule
->list
);
2301 nf_tables_rule_destroy(&ctx
, rule
);
2303 for (i
= 0; i
< n
; i
++) {
2304 if (info
[i
].ops
!= NULL
)
2305 module_put(info
[i
].ops
->type
->owner
);
2310 static struct nft_rule
*nft_rule_lookup_byid(const struct net
*net
,
2311 const struct nlattr
*nla
)
2313 u32 id
= ntohl(nla_get_be32(nla
));
2314 struct nft_trans
*trans
;
2316 list_for_each_entry(trans
, &net
->nft
.commit_list
, list
) {
2317 struct nft_rule
*rule
= nft_trans_rule(trans
);
2319 if (trans
->msg_type
== NFT_MSG_NEWRULE
&&
2320 id
== nft_trans_rule_id(trans
))
2323 return ERR_PTR(-ENOENT
);
2326 static int nf_tables_delrule(struct net
*net
, struct sock
*nlsk
,
2327 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
2328 const struct nlattr
* const nla
[],
2329 struct netlink_ext_ack
*extack
)
2331 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2332 u8 genmask
= nft_genmask_next(net
);
2333 struct nft_af_info
*afi
;
2334 struct nft_table
*table
;
2335 struct nft_chain
*chain
= NULL
;
2336 struct nft_rule
*rule
;
2337 int family
= nfmsg
->nfgen_family
, err
= 0;
2340 afi
= nf_tables_afinfo_lookup(net
, family
, false);
2342 return PTR_ERR(afi
);
2344 table
= nf_tables_table_lookup(afi
, nla
[NFTA_RULE_TABLE
], genmask
);
2346 return PTR_ERR(table
);
2348 if (nla
[NFTA_RULE_CHAIN
]) {
2349 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_RULE_CHAIN
],
2352 return PTR_ERR(chain
);
2355 nft_ctx_init(&ctx
, net
, skb
, nlh
, afi
, table
, chain
, nla
);
2358 if (nla
[NFTA_RULE_HANDLE
]) {
2359 rule
= nf_tables_rule_lookup(chain
,
2360 nla
[NFTA_RULE_HANDLE
]);
2362 return PTR_ERR(rule
);
2364 err
= nft_delrule(&ctx
, rule
);
2365 } else if (nla
[NFTA_RULE_ID
]) {
2366 rule
= nft_rule_lookup_byid(net
, nla
[NFTA_RULE_ID
]);
2368 return PTR_ERR(rule
);
2370 err
= nft_delrule(&ctx
, rule
);
2372 err
= nft_delrule_by_chain(&ctx
);
2375 list_for_each_entry(chain
, &table
->chains
, list
) {
2376 if (!nft_is_active_next(net
, chain
))
2380 err
= nft_delrule_by_chain(&ctx
);
2393 static LIST_HEAD(nf_tables_set_types
);
2395 int nft_register_set(struct nft_set_type
*type
)
2397 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
2398 list_add_tail_rcu(&type
->list
, &nf_tables_set_types
);
2399 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
2402 EXPORT_SYMBOL_GPL(nft_register_set
);
2404 void nft_unregister_set(struct nft_set_type
*type
)
2406 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
2407 list_del_rcu(&type
->list
);
2408 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
2410 EXPORT_SYMBOL_GPL(nft_unregister_set
);
2412 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
2413 NFT_SET_TIMEOUT | NFT_SET_OBJECT)
2415 static bool nft_set_ops_candidate(const struct nft_set_ops
*ops
, u32 flags
)
2417 return (flags
& ops
->features
) == (flags
& NFT_SET_FEATURES
);
2421 * Select a set implementation based on the data characteristics and the
2422 * given policy. The total memory use might not be known if no size is
2423 * given, in that case the amount of memory per element is used.
2425 static const struct nft_set_ops
*
2426 nft_select_set_ops(const struct nft_ctx
*ctx
,
2427 const struct nlattr
* const nla
[],
2428 const struct nft_set_desc
*desc
,
2429 enum nft_set_policies policy
)
2431 const struct nft_set_ops
*ops
, *bops
;
2432 struct nft_set_estimate est
, best
;
2433 const struct nft_set_type
*type
;
2436 #ifdef CONFIG_MODULES
2437 if (list_empty(&nf_tables_set_types
)) {
2438 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
2439 request_module("nft-set");
2440 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
2441 if (!list_empty(&nf_tables_set_types
))
2442 return ERR_PTR(-EAGAIN
);
2445 if (nla
[NFTA_SET_FLAGS
] != NULL
)
2446 flags
= ntohl(nla_get_be32(nla
[NFTA_SET_FLAGS
]));
2453 list_for_each_entry(type
, &nf_tables_set_types
, list
) {
2454 if (!type
->select_ops
)
2457 ops
= type
->select_ops(ctx
, desc
, flags
);
2461 if (!nft_set_ops_candidate(ops
, flags
))
2463 if (!ops
->estimate(desc
, flags
, &est
))
2467 case NFT_SET_POL_PERFORMANCE
:
2468 if (est
.lookup
< best
.lookup
)
2470 if (est
.lookup
== best
.lookup
) {
2472 if (est
.space
< best
.space
)
2474 } else if (est
.size
< best
.size
) {
2479 case NFT_SET_POL_MEMORY
:
2481 if (est
.space
< best
.space
)
2483 if (est
.space
== best
.space
&&
2484 est
.lookup
< best
.lookup
)
2486 } else if (est
.size
< best
.size
) {
2494 if (!try_module_get(type
->owner
))
2497 module_put(bops
->type
->owner
);
2506 return ERR_PTR(-EOPNOTSUPP
);
2509 static const struct nla_policy nft_set_policy
[NFTA_SET_MAX
+ 1] = {
2510 [NFTA_SET_TABLE
] = { .type
= NLA_STRING
,
2511 .len
= NFT_TABLE_MAXNAMELEN
- 1 },
2512 [NFTA_SET_NAME
] = { .type
= NLA_STRING
,
2513 .len
= NFT_SET_MAXNAMELEN
- 1 },
2514 [NFTA_SET_FLAGS
] = { .type
= NLA_U32
},
2515 [NFTA_SET_KEY_TYPE
] = { .type
= NLA_U32
},
2516 [NFTA_SET_KEY_LEN
] = { .type
= NLA_U32
},
2517 [NFTA_SET_DATA_TYPE
] = { .type
= NLA_U32
},
2518 [NFTA_SET_DATA_LEN
] = { .type
= NLA_U32
},
2519 [NFTA_SET_POLICY
] = { .type
= NLA_U32
},
2520 [NFTA_SET_DESC
] = { .type
= NLA_NESTED
},
2521 [NFTA_SET_ID
] = { .type
= NLA_U32
},
2522 [NFTA_SET_TIMEOUT
] = { .type
= NLA_U64
},
2523 [NFTA_SET_GC_INTERVAL
] = { .type
= NLA_U32
},
2524 [NFTA_SET_USERDATA
] = { .type
= NLA_BINARY
,
2525 .len
= NFT_USERDATA_MAXLEN
},
2526 [NFTA_SET_OBJ_TYPE
] = { .type
= NLA_U32
},
2529 static const struct nla_policy nft_set_desc_policy
[NFTA_SET_DESC_MAX
+ 1] = {
2530 [NFTA_SET_DESC_SIZE
] = { .type
= NLA_U32
},
2533 static int nft_ctx_init_from_setattr(struct nft_ctx
*ctx
, struct net
*net
,
2534 const struct sk_buff
*skb
,
2535 const struct nlmsghdr
*nlh
,
2536 const struct nlattr
* const nla
[],
2539 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2540 struct nft_af_info
*afi
= NULL
;
2541 struct nft_table
*table
= NULL
;
2543 if (nfmsg
->nfgen_family
!= NFPROTO_UNSPEC
) {
2544 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, false);
2546 return PTR_ERR(afi
);
2549 if (nla
[NFTA_SET_TABLE
] != NULL
) {
2551 return -EAFNOSUPPORT
;
2553 table
= nf_tables_table_lookup(afi
, nla
[NFTA_SET_TABLE
],
2556 return PTR_ERR(table
);
2559 nft_ctx_init(ctx
, net
, skb
, nlh
, afi
, table
, NULL
, nla
);
2563 static struct nft_set
*nf_tables_set_lookup(const struct nft_table
*table
,
2564 const struct nlattr
*nla
, u8 genmask
)
2566 struct nft_set
*set
;
2569 return ERR_PTR(-EINVAL
);
2571 list_for_each_entry(set
, &table
->sets
, list
) {
2572 if (!nla_strcmp(nla
, set
->name
) &&
2573 nft_active_genmask(set
, genmask
))
2576 return ERR_PTR(-ENOENT
);
2579 static struct nft_set
*nf_tables_set_lookup_byid(const struct net
*net
,
2580 const struct nlattr
*nla
,
2583 struct nft_trans
*trans
;
2584 u32 id
= ntohl(nla_get_be32(nla
));
2586 list_for_each_entry(trans
, &net
->nft
.commit_list
, list
) {
2587 struct nft_set
*set
= nft_trans_set(trans
);
2589 if (trans
->msg_type
== NFT_MSG_NEWSET
&&
2590 id
== nft_trans_set_id(trans
) &&
2591 nft_active_genmask(set
, genmask
))
2594 return ERR_PTR(-ENOENT
);
2597 struct nft_set
*nft_set_lookup(const struct net
*net
,
2598 const struct nft_table
*table
,
2599 const struct nlattr
*nla_set_name
,
2600 const struct nlattr
*nla_set_id
,
2603 struct nft_set
*set
;
2605 set
= nf_tables_set_lookup(table
, nla_set_name
, genmask
);
2610 set
= nf_tables_set_lookup_byid(net
, nla_set_id
, genmask
);
2614 EXPORT_SYMBOL_GPL(nft_set_lookup
);
2616 static int nf_tables_set_alloc_name(struct nft_ctx
*ctx
, struct nft_set
*set
,
2619 const struct nft_set
*i
;
2621 unsigned long *inuse
;
2622 unsigned int n
= 0, min
= 0;
2624 p
= strnchr(name
, NFT_SET_MAXNAMELEN
, '%');
2626 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
2629 inuse
= (unsigned long *)get_zeroed_page(GFP_KERNEL
);
2633 list_for_each_entry(i
, &ctx
->table
->sets
, list
) {
2636 if (!nft_is_active_next(ctx
->net
, set
))
2638 if (!sscanf(i
->name
, name
, &tmp
))
2640 if (tmp
< min
|| tmp
>= min
+ BITS_PER_BYTE
* PAGE_SIZE
)
2643 set_bit(tmp
- min
, inuse
);
2646 n
= find_first_zero_bit(inuse
, BITS_PER_BYTE
* PAGE_SIZE
);
2647 if (n
>= BITS_PER_BYTE
* PAGE_SIZE
) {
2648 min
+= BITS_PER_BYTE
* PAGE_SIZE
;
2649 memset(inuse
, 0, PAGE_SIZE
);
2652 free_page((unsigned long)inuse
);
2655 snprintf(set
->name
, sizeof(set
->name
), name
, min
+ n
);
2656 list_for_each_entry(i
, &ctx
->table
->sets
, list
) {
2657 if (!nft_is_active_next(ctx
->net
, i
))
2659 if (!strcmp(set
->name
, i
->name
))
2665 static int nf_tables_fill_set(struct sk_buff
*skb
, const struct nft_ctx
*ctx
,
2666 const struct nft_set
*set
, u16 event
, u16 flags
)
2668 struct nfgenmsg
*nfmsg
;
2669 struct nlmsghdr
*nlh
;
2670 struct nlattr
*desc
;
2671 u32 portid
= ctx
->portid
;
2674 event
= nfnl_msg_type(NFNL_SUBSYS_NFTABLES
, event
);
2675 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
),
2678 goto nla_put_failure
;
2680 nfmsg
= nlmsg_data(nlh
);
2681 nfmsg
->nfgen_family
= ctx
->afi
->family
;
2682 nfmsg
->version
= NFNETLINK_V0
;
2683 nfmsg
->res_id
= htons(ctx
->net
->nft
.base_seq
& 0xffff);
2685 if (nla_put_string(skb
, NFTA_SET_TABLE
, ctx
->table
->name
))
2686 goto nla_put_failure
;
2687 if (nla_put_string(skb
, NFTA_SET_NAME
, set
->name
))
2688 goto nla_put_failure
;
2689 if (set
->flags
!= 0)
2690 if (nla_put_be32(skb
, NFTA_SET_FLAGS
, htonl(set
->flags
)))
2691 goto nla_put_failure
;
2693 if (nla_put_be32(skb
, NFTA_SET_KEY_TYPE
, htonl(set
->ktype
)))
2694 goto nla_put_failure
;
2695 if (nla_put_be32(skb
, NFTA_SET_KEY_LEN
, htonl(set
->klen
)))
2696 goto nla_put_failure
;
2697 if (set
->flags
& NFT_SET_MAP
) {
2698 if (nla_put_be32(skb
, NFTA_SET_DATA_TYPE
, htonl(set
->dtype
)))
2699 goto nla_put_failure
;
2700 if (nla_put_be32(skb
, NFTA_SET_DATA_LEN
, htonl(set
->dlen
)))
2701 goto nla_put_failure
;
2703 if (set
->flags
& NFT_SET_OBJECT
&&
2704 nla_put_be32(skb
, NFTA_SET_OBJ_TYPE
, htonl(set
->objtype
)))
2705 goto nla_put_failure
;
2708 nla_put_be64(skb
, NFTA_SET_TIMEOUT
,
2709 cpu_to_be64(jiffies_to_msecs(set
->timeout
)),
2711 goto nla_put_failure
;
2713 nla_put_be32(skb
, NFTA_SET_GC_INTERVAL
, htonl(set
->gc_int
)))
2714 goto nla_put_failure
;
2716 if (set
->policy
!= NFT_SET_POL_PERFORMANCE
) {
2717 if (nla_put_be32(skb
, NFTA_SET_POLICY
, htonl(set
->policy
)))
2718 goto nla_put_failure
;
2721 if (nla_put(skb
, NFTA_SET_USERDATA
, set
->udlen
, set
->udata
))
2722 goto nla_put_failure
;
2724 desc
= nla_nest_start(skb
, NFTA_SET_DESC
);
2726 goto nla_put_failure
;
2728 nla_put_be32(skb
, NFTA_SET_DESC_SIZE
, htonl(set
->size
)))
2729 goto nla_put_failure
;
2730 nla_nest_end(skb
, desc
);
2732 nlmsg_end(skb
, nlh
);
2736 nlmsg_trim(skb
, nlh
);
2740 static void nf_tables_set_notify(const struct nft_ctx
*ctx
,
2741 const struct nft_set
*set
, int event
,
2744 struct sk_buff
*skb
;
2745 u32 portid
= ctx
->portid
;
2749 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
2752 skb
= nlmsg_new(NLMSG_GOODSIZE
, gfp_flags
);
2756 err
= nf_tables_fill_set(skb
, ctx
, set
, event
, 0);
2762 nfnetlink_send(skb
, ctx
->net
, portid
, NFNLGRP_NFTABLES
, ctx
->report
,
2766 nfnetlink_set_err(ctx
->net
, portid
, NFNLGRP_NFTABLES
, -ENOBUFS
);
2769 static int nf_tables_dump_sets(struct sk_buff
*skb
, struct netlink_callback
*cb
)
2771 const struct nft_set
*set
;
2772 unsigned int idx
, s_idx
= cb
->args
[0];
2773 struct nft_af_info
*afi
;
2774 struct nft_table
*table
, *cur_table
= (struct nft_table
*)cb
->args
[2];
2775 struct net
*net
= sock_net(skb
->sk
);
2776 int cur_family
= cb
->args
[3];
2777 struct nft_ctx
*ctx
= cb
->data
, ctx_set
;
2783 cb
->seq
= net
->nft
.base_seq
;
2785 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
2786 if (ctx
->afi
&& ctx
->afi
!= afi
)
2790 if (afi
->family
!= cur_family
)
2795 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
2796 if (ctx
->table
&& ctx
->table
!= table
)
2800 if (cur_table
!= table
)
2806 list_for_each_entry_rcu(set
, &table
->sets
, list
) {
2809 if (!nft_is_active(net
, set
))
2813 ctx_set
.table
= table
;
2815 if (nf_tables_fill_set(skb
, &ctx_set
, set
,
2819 cb
->args
[2] = (unsigned long) table
;
2820 cb
->args
[3] = afi
->family
;
2823 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
2837 static int nf_tables_dump_sets_done(struct netlink_callback
*cb
)
2843 static int nf_tables_getset(struct net
*net
, struct sock
*nlsk
,
2844 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
2845 const struct nlattr
* const nla
[],
2846 struct netlink_ext_ack
*extack
)
2848 u8 genmask
= nft_genmask_cur(net
);
2849 const struct nft_set
*set
;
2851 struct sk_buff
*skb2
;
2852 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2855 /* Verify existence before starting dump */
2856 err
= nft_ctx_init_from_setattr(&ctx
, net
, skb
, nlh
, nla
, genmask
);
2860 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
2861 struct netlink_dump_control c
= {
2862 .dump
= nf_tables_dump_sets
,
2863 .done
= nf_tables_dump_sets_done
,
2865 struct nft_ctx
*ctx_dump
;
2867 ctx_dump
= kmalloc(sizeof(*ctx_dump
), GFP_KERNEL
);
2868 if (ctx_dump
== NULL
)
2874 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
2877 /* Only accept unspec with dump */
2878 if (nfmsg
->nfgen_family
== NFPROTO_UNSPEC
)
2879 return -EAFNOSUPPORT
;
2880 if (!nla
[NFTA_SET_TABLE
])
2883 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_NAME
], genmask
);
2885 return PTR_ERR(set
);
2887 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
2891 err
= nf_tables_fill_set(skb2
, &ctx
, set
, NFT_MSG_NEWSET
, 0);
2895 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
2902 static int nf_tables_set_desc_parse(const struct nft_ctx
*ctx
,
2903 struct nft_set_desc
*desc
,
2904 const struct nlattr
*nla
)
2906 struct nlattr
*da
[NFTA_SET_DESC_MAX
+ 1];
2909 err
= nla_parse_nested(da
, NFTA_SET_DESC_MAX
, nla
,
2910 nft_set_desc_policy
, NULL
);
2914 if (da
[NFTA_SET_DESC_SIZE
] != NULL
)
2915 desc
->size
= ntohl(nla_get_be32(da
[NFTA_SET_DESC_SIZE
]));
2920 static int nf_tables_newset(struct net
*net
, struct sock
*nlsk
,
2921 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
2922 const struct nlattr
* const nla
[],
2923 struct netlink_ext_ack
*extack
)
2925 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2926 u8 genmask
= nft_genmask_next(net
);
2927 const struct nft_set_ops
*ops
;
2928 struct nft_af_info
*afi
;
2929 struct nft_table
*table
;
2930 struct nft_set
*set
;
2932 char name
[NFT_SET_MAXNAMELEN
];
2936 u32 ktype
, dtype
, flags
, policy
, gc_int
, objtype
;
2937 struct nft_set_desc desc
;
2938 unsigned char *udata
;
2942 if (nla
[NFTA_SET_TABLE
] == NULL
||
2943 nla
[NFTA_SET_NAME
] == NULL
||
2944 nla
[NFTA_SET_KEY_LEN
] == NULL
||
2945 nla
[NFTA_SET_ID
] == NULL
)
2948 memset(&desc
, 0, sizeof(desc
));
2950 ktype
= NFT_DATA_VALUE
;
2951 if (nla
[NFTA_SET_KEY_TYPE
] != NULL
) {
2952 ktype
= ntohl(nla_get_be32(nla
[NFTA_SET_KEY_TYPE
]));
2953 if ((ktype
& NFT_DATA_RESERVED_MASK
) == NFT_DATA_RESERVED_MASK
)
2957 desc
.klen
= ntohl(nla_get_be32(nla
[NFTA_SET_KEY_LEN
]));
2958 if (desc
.klen
== 0 || desc
.klen
> NFT_DATA_VALUE_MAXLEN
)
2962 if (nla
[NFTA_SET_FLAGS
] != NULL
) {
2963 flags
= ntohl(nla_get_be32(nla
[NFTA_SET_FLAGS
]));
2964 if (flags
& ~(NFT_SET_ANONYMOUS
| NFT_SET_CONSTANT
|
2965 NFT_SET_INTERVAL
| NFT_SET_TIMEOUT
|
2966 NFT_SET_MAP
| NFT_SET_EVAL
|
2969 /* Only one of these operations is supported */
2970 if ((flags
& (NFT_SET_MAP
| NFT_SET_EVAL
| NFT_SET_OBJECT
)) ==
2971 (NFT_SET_MAP
| NFT_SET_EVAL
| NFT_SET_OBJECT
))
2976 if (nla
[NFTA_SET_DATA_TYPE
] != NULL
) {
2977 if (!(flags
& NFT_SET_MAP
))
2980 dtype
= ntohl(nla_get_be32(nla
[NFTA_SET_DATA_TYPE
]));
2981 if ((dtype
& NFT_DATA_RESERVED_MASK
) == NFT_DATA_RESERVED_MASK
&&
2982 dtype
!= NFT_DATA_VERDICT
)
2985 if (dtype
!= NFT_DATA_VERDICT
) {
2986 if (nla
[NFTA_SET_DATA_LEN
] == NULL
)
2988 desc
.dlen
= ntohl(nla_get_be32(nla
[NFTA_SET_DATA_LEN
]));
2989 if (desc
.dlen
== 0 || desc
.dlen
> NFT_DATA_VALUE_MAXLEN
)
2992 desc
.dlen
= sizeof(struct nft_verdict
);
2993 } else if (flags
& NFT_SET_MAP
)
2996 if (nla
[NFTA_SET_OBJ_TYPE
] != NULL
) {
2997 if (!(flags
& NFT_SET_OBJECT
))
3000 objtype
= ntohl(nla_get_be32(nla
[NFTA_SET_OBJ_TYPE
]));
3001 if (objtype
== NFT_OBJECT_UNSPEC
||
3002 objtype
> NFT_OBJECT_MAX
)
3004 } else if (flags
& NFT_SET_OBJECT
)
3007 objtype
= NFT_OBJECT_UNSPEC
;
3010 if (nla
[NFTA_SET_TIMEOUT
] != NULL
) {
3011 if (!(flags
& NFT_SET_TIMEOUT
))
3013 timeout
= msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3014 nla
[NFTA_SET_TIMEOUT
])));
3017 if (nla
[NFTA_SET_GC_INTERVAL
] != NULL
) {
3018 if (!(flags
& NFT_SET_TIMEOUT
))
3020 gc_int
= ntohl(nla_get_be32(nla
[NFTA_SET_GC_INTERVAL
]));
3023 policy
= NFT_SET_POL_PERFORMANCE
;
3024 if (nla
[NFTA_SET_POLICY
] != NULL
)
3025 policy
= ntohl(nla_get_be32(nla
[NFTA_SET_POLICY
]));
3027 if (nla
[NFTA_SET_DESC
] != NULL
) {
3028 err
= nf_tables_set_desc_parse(&ctx
, &desc
, nla
[NFTA_SET_DESC
]);
3033 create
= nlh
->nlmsg_flags
& NLM_F_CREATE
? true : false;
3035 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, create
);
3037 return PTR_ERR(afi
);
3039 table
= nf_tables_table_lookup(afi
, nla
[NFTA_SET_TABLE
], genmask
);
3041 return PTR_ERR(table
);
3043 nft_ctx_init(&ctx
, net
, skb
, nlh
, afi
, table
, NULL
, nla
);
3045 set
= nf_tables_set_lookup(table
, nla
[NFTA_SET_NAME
], genmask
);
3047 if (PTR_ERR(set
) != -ENOENT
)
3048 return PTR_ERR(set
);
3050 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
3052 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
3057 if (!(nlh
->nlmsg_flags
& NLM_F_CREATE
))
3060 ops
= nft_select_set_ops(&ctx
, nla
, &desc
, policy
);
3062 return PTR_ERR(ops
);
3065 if (nla
[NFTA_SET_USERDATA
])
3066 udlen
= nla_len(nla
[NFTA_SET_USERDATA
]);
3069 if (ops
->privsize
!= NULL
)
3070 size
= ops
->privsize(nla
, &desc
);
3072 set
= kvzalloc(sizeof(*set
) + size
+ udlen
, GFP_KERNEL
);
3078 nla_strlcpy(name
, nla
[NFTA_SET_NAME
], sizeof(set
->name
));
3079 err
= nf_tables_set_alloc_name(&ctx
, set
, name
);
3085 udata
= set
->data
+ size
;
3086 nla_memcpy(udata
, nla
[NFTA_SET_USERDATA
], udlen
);
3089 INIT_LIST_HEAD(&set
->bindings
);
3092 set
->klen
= desc
.klen
;
3094 set
->objtype
= objtype
;
3095 set
->dlen
= desc
.dlen
;
3097 set
->size
= desc
.size
;
3098 set
->policy
= policy
;
3101 set
->timeout
= timeout
;
3102 set
->gc_int
= gc_int
;
3104 err
= ops
->init(set
, &desc
, nla
);
3108 err
= nft_trans_set_add(&ctx
, NFT_MSG_NEWSET
, set
);
3112 list_add_tail_rcu(&set
->list
, &table
->sets
);
3121 module_put(ops
->type
->owner
);
3125 static void nft_set_destroy(struct nft_set
*set
)
3127 set
->ops
->destroy(set
);
3128 module_put(set
->ops
->type
->owner
);
3132 static void nf_tables_set_destroy(const struct nft_ctx
*ctx
, struct nft_set
*set
)
3134 list_del_rcu(&set
->list
);
3135 nf_tables_set_notify(ctx
, set
, NFT_MSG_DELSET
, GFP_ATOMIC
);
3136 nft_set_destroy(set
);
3139 static int nf_tables_delset(struct net
*net
, struct sock
*nlsk
,
3140 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
3141 const struct nlattr
* const nla
[],
3142 struct netlink_ext_ack
*extack
)
3144 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
3145 u8 genmask
= nft_genmask_next(net
);
3146 struct nft_set
*set
;
3150 if (nfmsg
->nfgen_family
== NFPROTO_UNSPEC
)
3151 return -EAFNOSUPPORT
;
3152 if (nla
[NFTA_SET_TABLE
] == NULL
)
3155 err
= nft_ctx_init_from_setattr(&ctx
, net
, skb
, nlh
, nla
, genmask
);
3159 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_NAME
], genmask
);
3161 return PTR_ERR(set
);
3162 if (!list_empty(&set
->bindings
))
3165 return nft_delset(&ctx
, set
);
3168 static int nf_tables_bind_check_setelem(const struct nft_ctx
*ctx
,
3169 struct nft_set
*set
,
3170 const struct nft_set_iter
*iter
,
3171 struct nft_set_elem
*elem
)
3173 const struct nft_set_ext
*ext
= nft_set_elem_ext(set
, elem
->priv
);
3174 enum nft_registers dreg
;
3176 dreg
= nft_type_to_reg(set
->dtype
);
3177 return nft_validate_register_store(ctx
, dreg
, nft_set_ext_data(ext
),
3178 set
->dtype
== NFT_DATA_VERDICT
?
3179 NFT_DATA_VERDICT
: NFT_DATA_VALUE
,
3183 int nf_tables_bind_set(const struct nft_ctx
*ctx
, struct nft_set
*set
,
3184 struct nft_set_binding
*binding
)
3186 struct nft_set_binding
*i
;
3187 struct nft_set_iter iter
;
3189 if (!list_empty(&set
->bindings
) && set
->flags
& NFT_SET_ANONYMOUS
)
3192 if (binding
->flags
& NFT_SET_MAP
) {
3193 /* If the set is already bound to the same chain all
3194 * jumps are already validated for that chain.
3196 list_for_each_entry(i
, &set
->bindings
, list
) {
3197 if (i
->flags
& NFT_SET_MAP
&&
3198 i
->chain
== binding
->chain
)
3202 iter
.genmask
= nft_genmask_next(ctx
->net
);
3206 iter
.fn
= nf_tables_bind_check_setelem
;
3208 set
->ops
->walk(ctx
, set
, &iter
);
3213 binding
->chain
= ctx
->chain
;
3214 list_add_tail_rcu(&binding
->list
, &set
->bindings
);
3217 EXPORT_SYMBOL_GPL(nf_tables_bind_set
);
3219 void nf_tables_unbind_set(const struct nft_ctx
*ctx
, struct nft_set
*set
,
3220 struct nft_set_binding
*binding
)
3222 list_del_rcu(&binding
->list
);
3224 if (list_empty(&set
->bindings
) && set
->flags
& NFT_SET_ANONYMOUS
&&
3225 nft_is_active(ctx
->net
, set
))
3226 nf_tables_set_destroy(ctx
, set
);
3228 EXPORT_SYMBOL_GPL(nf_tables_unbind_set
);
3230 const struct nft_set_ext_type nft_set_ext_types
[] = {
3231 [NFT_SET_EXT_KEY
] = {
3232 .align
= __alignof__(u32
),
3234 [NFT_SET_EXT_DATA
] = {
3235 .align
= __alignof__(u32
),
3237 [NFT_SET_EXT_EXPR
] = {
3238 .align
= __alignof__(struct nft_expr
),
3240 [NFT_SET_EXT_OBJREF
] = {
3241 .len
= sizeof(struct nft_object
*),
3242 .align
= __alignof__(struct nft_object
*),
3244 [NFT_SET_EXT_FLAGS
] = {
3246 .align
= __alignof__(u8
),
3248 [NFT_SET_EXT_TIMEOUT
] = {
3250 .align
= __alignof__(u64
),
3252 [NFT_SET_EXT_EXPIRATION
] = {
3253 .len
= sizeof(unsigned long),
3254 .align
= __alignof__(unsigned long),
3256 [NFT_SET_EXT_USERDATA
] = {
3257 .len
= sizeof(struct nft_userdata
),
3258 .align
= __alignof__(struct nft_userdata
),
3261 EXPORT_SYMBOL_GPL(nft_set_ext_types
);
3267 static const struct nla_policy nft_set_elem_policy
[NFTA_SET_ELEM_MAX
+ 1] = {
3268 [NFTA_SET_ELEM_KEY
] = { .type
= NLA_NESTED
},
3269 [NFTA_SET_ELEM_DATA
] = { .type
= NLA_NESTED
},
3270 [NFTA_SET_ELEM_FLAGS
] = { .type
= NLA_U32
},
3271 [NFTA_SET_ELEM_TIMEOUT
] = { .type
= NLA_U64
},
3272 [NFTA_SET_ELEM_USERDATA
] = { .type
= NLA_BINARY
,
3273 .len
= NFT_USERDATA_MAXLEN
},
3276 static const struct nla_policy nft_set_elem_list_policy
[NFTA_SET_ELEM_LIST_MAX
+ 1] = {
3277 [NFTA_SET_ELEM_LIST_TABLE
] = { .type
= NLA_STRING
,
3278 .len
= NFT_TABLE_MAXNAMELEN
- 1 },
3279 [NFTA_SET_ELEM_LIST_SET
] = { .type
= NLA_STRING
,
3280 .len
= NFT_SET_MAXNAMELEN
- 1 },
3281 [NFTA_SET_ELEM_LIST_ELEMENTS
] = { .type
= NLA_NESTED
},
3282 [NFTA_SET_ELEM_LIST_SET_ID
] = { .type
= NLA_U32
},
3285 static int nft_ctx_init_from_elemattr(struct nft_ctx
*ctx
, struct net
*net
,
3286 const struct sk_buff
*skb
,
3287 const struct nlmsghdr
*nlh
,
3288 const struct nlattr
* const nla
[],
3291 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
3292 struct nft_af_info
*afi
;
3293 struct nft_table
*table
;
3295 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, false);
3297 return PTR_ERR(afi
);
3299 table
= nf_tables_table_lookup(afi
, nla
[NFTA_SET_ELEM_LIST_TABLE
],
3302 return PTR_ERR(table
);
3304 nft_ctx_init(ctx
, net
, skb
, nlh
, afi
, table
, NULL
, nla
);
3308 static int nf_tables_fill_setelem(struct sk_buff
*skb
,
3309 const struct nft_set
*set
,
3310 const struct nft_set_elem
*elem
)
3312 const struct nft_set_ext
*ext
= nft_set_elem_ext(set
, elem
->priv
);
3313 unsigned char *b
= skb_tail_pointer(skb
);
3314 struct nlattr
*nest
;
3316 nest
= nla_nest_start(skb
, NFTA_LIST_ELEM
);
3318 goto nla_put_failure
;
3320 if (nft_data_dump(skb
, NFTA_SET_ELEM_KEY
, nft_set_ext_key(ext
),
3321 NFT_DATA_VALUE
, set
->klen
) < 0)
3322 goto nla_put_failure
;
3324 if (nft_set_ext_exists(ext
, NFT_SET_EXT_DATA
) &&
3325 nft_data_dump(skb
, NFTA_SET_ELEM_DATA
, nft_set_ext_data(ext
),
3326 set
->dtype
== NFT_DATA_VERDICT
? NFT_DATA_VERDICT
: NFT_DATA_VALUE
,
3328 goto nla_put_failure
;
3330 if (nft_set_ext_exists(ext
, NFT_SET_EXT_EXPR
) &&
3331 nft_expr_dump(skb
, NFTA_SET_ELEM_EXPR
, nft_set_ext_expr(ext
)) < 0)
3332 goto nla_put_failure
;
3334 if (nft_set_ext_exists(ext
, NFT_SET_EXT_OBJREF
) &&
3335 nla_put_string(skb
, NFTA_SET_ELEM_OBJREF
,
3336 (*nft_set_ext_obj(ext
))->name
) < 0)
3337 goto nla_put_failure
;
3339 if (nft_set_ext_exists(ext
, NFT_SET_EXT_FLAGS
) &&
3340 nla_put_be32(skb
, NFTA_SET_ELEM_FLAGS
,
3341 htonl(*nft_set_ext_flags(ext
))))
3342 goto nla_put_failure
;
3344 if (nft_set_ext_exists(ext
, NFT_SET_EXT_TIMEOUT
) &&
3345 nla_put_be64(skb
, NFTA_SET_ELEM_TIMEOUT
,
3346 cpu_to_be64(jiffies_to_msecs(
3347 *nft_set_ext_timeout(ext
))),
3349 goto nla_put_failure
;
3351 if (nft_set_ext_exists(ext
, NFT_SET_EXT_EXPIRATION
)) {
3352 unsigned long expires
, now
= jiffies
;
3354 expires
= *nft_set_ext_expiration(ext
);
3355 if (time_before(now
, expires
))
3360 if (nla_put_be64(skb
, NFTA_SET_ELEM_EXPIRATION
,
3361 cpu_to_be64(jiffies_to_msecs(expires
)),
3363 goto nla_put_failure
;
3366 if (nft_set_ext_exists(ext
, NFT_SET_EXT_USERDATA
)) {
3367 struct nft_userdata
*udata
;
3369 udata
= nft_set_ext_userdata(ext
);
3370 if (nla_put(skb
, NFTA_SET_ELEM_USERDATA
,
3371 udata
->len
+ 1, udata
->data
))
3372 goto nla_put_failure
;
3375 nla_nest_end(skb
, nest
);
3383 struct nft_set_dump_args
{
3384 const struct netlink_callback
*cb
;
3385 struct nft_set_iter iter
;
3386 struct sk_buff
*skb
;
3389 static int nf_tables_dump_setelem(const struct nft_ctx
*ctx
,
3390 struct nft_set
*set
,
3391 const struct nft_set_iter
*iter
,
3392 struct nft_set_elem
*elem
)
3394 struct nft_set_dump_args
*args
;
3396 args
= container_of(iter
, struct nft_set_dump_args
, iter
);
3397 return nf_tables_fill_setelem(args
->skb
, set
, elem
);
3400 struct nft_set_dump_ctx
{
3401 const struct nft_set
*set
;
3405 static int nf_tables_dump_set(struct sk_buff
*skb
, struct netlink_callback
*cb
)
3407 struct nft_set_dump_ctx
*dump_ctx
= cb
->data
;
3408 struct net
*net
= sock_net(skb
->sk
);
3409 struct nft_af_info
*afi
;
3410 struct nft_table
*table
;
3411 struct nft_set
*set
;
3412 struct nft_set_dump_args args
;
3413 bool set_found
= false;
3414 struct nfgenmsg
*nfmsg
;
3415 struct nlmsghdr
*nlh
;
3416 struct nlattr
*nest
;
3421 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
3422 if (afi
!= dump_ctx
->ctx
.afi
)
3425 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
3426 if (table
!= dump_ctx
->ctx
.table
)
3429 list_for_each_entry_rcu(set
, &table
->sets
, list
) {
3430 if (set
== dump_ctx
->set
) {
3445 event
= nfnl_msg_type(NFNL_SUBSYS_NFTABLES
, NFT_MSG_NEWSETELEM
);
3446 portid
= NETLINK_CB(cb
->skb
).portid
;
3447 seq
= cb
->nlh
->nlmsg_seq
;
3449 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
),
3452 goto nla_put_failure
;
3454 nfmsg
= nlmsg_data(nlh
);
3455 nfmsg
->nfgen_family
= afi
->family
;
3456 nfmsg
->version
= NFNETLINK_V0
;
3457 nfmsg
->res_id
= htons(net
->nft
.base_seq
& 0xffff);
3459 if (nla_put_string(skb
, NFTA_SET_ELEM_LIST_TABLE
, table
->name
))
3460 goto nla_put_failure
;
3461 if (nla_put_string(skb
, NFTA_SET_ELEM_LIST_SET
, set
->name
))
3462 goto nla_put_failure
;
3464 nest
= nla_nest_start(skb
, NFTA_SET_ELEM_LIST_ELEMENTS
);
3466 goto nla_put_failure
;
3470 args
.iter
.genmask
= nft_genmask_cur(net
);
3471 args
.iter
.skip
= cb
->args
[0];
3472 args
.iter
.count
= 0;
3474 args
.iter
.fn
= nf_tables_dump_setelem
;
3475 set
->ops
->walk(&dump_ctx
->ctx
, set
, &args
.iter
);
3478 nla_nest_end(skb
, nest
);
3479 nlmsg_end(skb
, nlh
);
3481 if (args
.iter
.err
&& args
.iter
.err
!= -EMSGSIZE
)
3482 return args
.iter
.err
;
3483 if (args
.iter
.count
== cb
->args
[0])
3486 cb
->args
[0] = args
.iter
.count
;
3494 static int nf_tables_dump_set_done(struct netlink_callback
*cb
)
3500 static int nf_tables_getsetelem(struct net
*net
, struct sock
*nlsk
,
3501 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
3502 const struct nlattr
* const nla
[],
3503 struct netlink_ext_ack
*extack
)
3505 u8 genmask
= nft_genmask_cur(net
);
3506 const struct nft_set
*set
;
3510 err
= nft_ctx_init_from_elemattr(&ctx
, net
, skb
, nlh
, nla
, genmask
);
3514 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
],
3517 return PTR_ERR(set
);
3519 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
3520 struct netlink_dump_control c
= {
3521 .dump
= nf_tables_dump_set
,
3522 .done
= nf_tables_dump_set_done
,
3524 struct nft_set_dump_ctx
*dump_ctx
;
3526 dump_ctx
= kmalloc(sizeof(*dump_ctx
), GFP_KERNEL
);
3530 dump_ctx
->set
= set
;
3531 dump_ctx
->ctx
= ctx
;
3534 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
3539 static int nf_tables_fill_setelem_info(struct sk_buff
*skb
,
3540 const struct nft_ctx
*ctx
, u32 seq
,
3541 u32 portid
, int event
, u16 flags
,
3542 const struct nft_set
*set
,
3543 const struct nft_set_elem
*elem
)
3545 struct nfgenmsg
*nfmsg
;
3546 struct nlmsghdr
*nlh
;
3547 struct nlattr
*nest
;
3550 event
= nfnl_msg_type(NFNL_SUBSYS_NFTABLES
, event
);
3551 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
),
3554 goto nla_put_failure
;
3556 nfmsg
= nlmsg_data(nlh
);
3557 nfmsg
->nfgen_family
= ctx
->afi
->family
;
3558 nfmsg
->version
= NFNETLINK_V0
;
3559 nfmsg
->res_id
= htons(ctx
->net
->nft
.base_seq
& 0xffff);
3561 if (nla_put_string(skb
, NFTA_SET_TABLE
, ctx
->table
->name
))
3562 goto nla_put_failure
;
3563 if (nla_put_string(skb
, NFTA_SET_NAME
, set
->name
))
3564 goto nla_put_failure
;
3566 nest
= nla_nest_start(skb
, NFTA_SET_ELEM_LIST_ELEMENTS
);
3568 goto nla_put_failure
;
3570 err
= nf_tables_fill_setelem(skb
, set
, elem
);
3572 goto nla_put_failure
;
3574 nla_nest_end(skb
, nest
);
3576 nlmsg_end(skb
, nlh
);
3580 nlmsg_trim(skb
, nlh
);
3584 static void nf_tables_setelem_notify(const struct nft_ctx
*ctx
,
3585 const struct nft_set
*set
,
3586 const struct nft_set_elem
*elem
,
3587 int event
, u16 flags
)
3589 struct net
*net
= ctx
->net
;
3590 u32 portid
= ctx
->portid
;
3591 struct sk_buff
*skb
;
3594 if (!ctx
->report
&& !nfnetlink_has_listeners(net
, NFNLGRP_NFTABLES
))
3597 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
3601 err
= nf_tables_fill_setelem_info(skb
, ctx
, 0, portid
, event
, flags
,
3608 nfnetlink_send(skb
, net
, portid
, NFNLGRP_NFTABLES
, ctx
->report
,
3612 nfnetlink_set_err(net
, portid
, NFNLGRP_NFTABLES
, -ENOBUFS
);
3615 static struct nft_trans
*nft_trans_elem_alloc(struct nft_ctx
*ctx
,
3617 struct nft_set
*set
)
3619 struct nft_trans
*trans
;
3621 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_elem
));
3625 nft_trans_elem_set(trans
) = set
;
3629 void *nft_set_elem_init(const struct nft_set
*set
,
3630 const struct nft_set_ext_tmpl
*tmpl
,
3631 const u32
*key
, const u32
*data
,
3632 u64 timeout
, gfp_t gfp
)
3634 struct nft_set_ext
*ext
;
3637 elem
= kzalloc(set
->ops
->elemsize
+ tmpl
->len
, gfp
);
3641 ext
= nft_set_elem_ext(set
, elem
);
3642 nft_set_ext_init(ext
, tmpl
);
3644 memcpy(nft_set_ext_key(ext
), key
, set
->klen
);
3645 if (nft_set_ext_exists(ext
, NFT_SET_EXT_DATA
))
3646 memcpy(nft_set_ext_data(ext
), data
, set
->dlen
);
3647 if (nft_set_ext_exists(ext
, NFT_SET_EXT_EXPIRATION
))
3648 *nft_set_ext_expiration(ext
) =
3650 if (nft_set_ext_exists(ext
, NFT_SET_EXT_TIMEOUT
))
3651 *nft_set_ext_timeout(ext
) = timeout
;
3656 void nft_set_elem_destroy(const struct nft_set
*set
, void *elem
,
3659 struct nft_set_ext
*ext
= nft_set_elem_ext(set
, elem
);
3661 nft_data_release(nft_set_ext_key(ext
), NFT_DATA_VALUE
);
3662 if (nft_set_ext_exists(ext
, NFT_SET_EXT_DATA
))
3663 nft_data_release(nft_set_ext_data(ext
), set
->dtype
);
3664 if (destroy_expr
&& nft_set_ext_exists(ext
, NFT_SET_EXT_EXPR
))
3665 nf_tables_expr_destroy(NULL
, nft_set_ext_expr(ext
));
3666 if (nft_set_ext_exists(ext
, NFT_SET_EXT_OBJREF
))
3667 (*nft_set_ext_obj(ext
))->use
--;
3670 EXPORT_SYMBOL_GPL(nft_set_elem_destroy
);
3672 /* Only called from commit path, nft_set_elem_deactivate() already deals with
3673 * the refcounting from the preparation phase.
3675 static void nf_tables_set_elem_destroy(const struct nft_set
*set
, void *elem
)
3677 struct nft_set_ext
*ext
= nft_set_elem_ext(set
, elem
);
3679 if (nft_set_ext_exists(ext
, NFT_SET_EXT_EXPR
))
3680 nf_tables_expr_destroy(NULL
, nft_set_ext_expr(ext
));
3684 static int nft_setelem_parse_flags(const struct nft_set
*set
,
3685 const struct nlattr
*attr
, u32
*flags
)
3690 *flags
= ntohl(nla_get_be32(attr
));
3691 if (*flags
& ~NFT_SET_ELEM_INTERVAL_END
)
3693 if (!(set
->flags
& NFT_SET_INTERVAL
) &&
3694 *flags
& NFT_SET_ELEM_INTERVAL_END
)
3700 static int nft_add_set_elem(struct nft_ctx
*ctx
, struct nft_set
*set
,
3701 const struct nlattr
*attr
, u32 nlmsg_flags
)
3703 struct nlattr
*nla
[NFTA_SET_ELEM_MAX
+ 1];
3704 u8 genmask
= nft_genmask_next(ctx
->net
);
3705 struct nft_data_desc d1
, d2
;
3706 struct nft_set_ext_tmpl tmpl
;
3707 struct nft_set_ext
*ext
, *ext2
;
3708 struct nft_set_elem elem
;
3709 struct nft_set_binding
*binding
;
3710 struct nft_object
*obj
= NULL
;
3711 struct nft_userdata
*udata
;
3712 struct nft_data data
;
3713 enum nft_registers dreg
;
3714 struct nft_trans
*trans
;
3720 err
= nla_parse_nested(nla
, NFTA_SET_ELEM_MAX
, attr
,
3721 nft_set_elem_policy
, NULL
);
3725 if (nla
[NFTA_SET_ELEM_KEY
] == NULL
)
3728 nft_set_ext_prepare(&tmpl
);
3730 err
= nft_setelem_parse_flags(set
, nla
[NFTA_SET_ELEM_FLAGS
], &flags
);
3734 nft_set_ext_add(&tmpl
, NFT_SET_EXT_FLAGS
);
3736 if (set
->flags
& NFT_SET_MAP
) {
3737 if (nla
[NFTA_SET_ELEM_DATA
] == NULL
&&
3738 !(flags
& NFT_SET_ELEM_INTERVAL_END
))
3740 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
&&
3741 flags
& NFT_SET_ELEM_INTERVAL_END
)
3744 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
)
3749 if (nla
[NFTA_SET_ELEM_TIMEOUT
] != NULL
) {
3750 if (!(set
->flags
& NFT_SET_TIMEOUT
))
3752 timeout
= msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3753 nla
[NFTA_SET_ELEM_TIMEOUT
])));
3754 } else if (set
->flags
& NFT_SET_TIMEOUT
) {
3755 timeout
= set
->timeout
;
3758 err
= nft_data_init(ctx
, &elem
.key
.val
, sizeof(elem
.key
), &d1
,
3759 nla
[NFTA_SET_ELEM_KEY
]);
3763 if (d1
.type
!= NFT_DATA_VALUE
|| d1
.len
!= set
->klen
)
3766 nft_set_ext_add_length(&tmpl
, NFT_SET_EXT_KEY
, d1
.len
);
3768 nft_set_ext_add(&tmpl
, NFT_SET_EXT_EXPIRATION
);
3769 if (timeout
!= set
->timeout
)
3770 nft_set_ext_add(&tmpl
, NFT_SET_EXT_TIMEOUT
);
3773 if (nla
[NFTA_SET_ELEM_OBJREF
] != NULL
) {
3774 if (!(set
->flags
& NFT_SET_OBJECT
)) {
3778 obj
= nf_tables_obj_lookup(ctx
->table
, nla
[NFTA_SET_ELEM_OBJREF
],
3779 set
->objtype
, genmask
);
3784 nft_set_ext_add(&tmpl
, NFT_SET_EXT_OBJREF
);
3787 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
) {
3788 err
= nft_data_init(ctx
, &data
, sizeof(data
), &d2
,
3789 nla
[NFTA_SET_ELEM_DATA
]);
3794 if (set
->dtype
!= NFT_DATA_VERDICT
&& d2
.len
!= set
->dlen
)
3797 dreg
= nft_type_to_reg(set
->dtype
);
3798 list_for_each_entry(binding
, &set
->bindings
, list
) {
3799 struct nft_ctx bind_ctx
= {
3802 .table
= ctx
->table
,
3803 .chain
= (struct nft_chain
*)binding
->chain
,
3806 if (!(binding
->flags
& NFT_SET_MAP
))
3809 err
= nft_validate_register_store(&bind_ctx
, dreg
,
3816 nft_set_ext_add_length(&tmpl
, NFT_SET_EXT_DATA
, d2
.len
);
3819 /* The full maximum length of userdata can exceed the maximum
3820 * offset value (U8_MAX) for following extensions, therefor it
3821 * must be the last extension added.
3824 if (nla
[NFTA_SET_ELEM_USERDATA
] != NULL
) {
3825 ulen
= nla_len(nla
[NFTA_SET_ELEM_USERDATA
]);
3827 nft_set_ext_add_length(&tmpl
, NFT_SET_EXT_USERDATA
,
3832 elem
.priv
= nft_set_elem_init(set
, &tmpl
, elem
.key
.val
.data
, data
.data
,
3833 timeout
, GFP_KERNEL
);
3834 if (elem
.priv
== NULL
)
3837 ext
= nft_set_elem_ext(set
, elem
.priv
);
3839 *nft_set_ext_flags(ext
) = flags
;
3841 udata
= nft_set_ext_userdata(ext
);
3842 udata
->len
= ulen
- 1;
3843 nla_memcpy(&udata
->data
, nla
[NFTA_SET_ELEM_USERDATA
], ulen
);
3846 *nft_set_ext_obj(ext
) = obj
;
3850 trans
= nft_trans_elem_alloc(ctx
, NFT_MSG_NEWSETELEM
, set
);
3854 ext
->genmask
= nft_genmask_cur(ctx
->net
) | NFT_SET_ELEM_BUSY_MASK
;
3855 err
= set
->ops
->insert(ctx
->net
, set
, &elem
, &ext2
);
3857 if (err
== -EEXIST
) {
3858 if (nft_set_ext_exists(ext
, NFT_SET_EXT_DATA
) ^
3859 nft_set_ext_exists(ext2
, NFT_SET_EXT_DATA
) ||
3860 nft_set_ext_exists(ext
, NFT_SET_EXT_OBJREF
) ^
3861 nft_set_ext_exists(ext2
, NFT_SET_EXT_OBJREF
))
3863 if ((nft_set_ext_exists(ext
, NFT_SET_EXT_DATA
) &&
3864 nft_set_ext_exists(ext2
, NFT_SET_EXT_DATA
) &&
3865 memcmp(nft_set_ext_data(ext
),
3866 nft_set_ext_data(ext2
), set
->dlen
) != 0) ||
3867 (nft_set_ext_exists(ext
, NFT_SET_EXT_OBJREF
) &&
3868 nft_set_ext_exists(ext2
, NFT_SET_EXT_OBJREF
) &&
3869 *nft_set_ext_obj(ext
) != *nft_set_ext_obj(ext2
)))
3871 else if (!(nlmsg_flags
& NLM_F_EXCL
))
3878 !atomic_add_unless(&set
->nelems
, 1, set
->size
+ set
->ndeact
)) {
3883 nft_trans_elem(trans
) = elem
;
3884 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
3888 set
->ops
->remove(ctx
->net
, set
, &elem
);
3894 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
)
3895 nft_data_release(&data
, d2
.type
);
3897 nft_data_release(&elem
.key
.val
, d1
.type
);
3902 static int nf_tables_newsetelem(struct net
*net
, struct sock
*nlsk
,
3903 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
3904 const struct nlattr
* const nla
[],
3905 struct netlink_ext_ack
*extack
)
3907 u8 genmask
= nft_genmask_next(net
);
3908 const struct nlattr
*attr
;
3909 struct nft_set
*set
;
3913 if (nla
[NFTA_SET_ELEM_LIST_ELEMENTS
] == NULL
)
3916 err
= nft_ctx_init_from_elemattr(&ctx
, net
, skb
, nlh
, nla
, genmask
);
3920 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
],
3923 if (nla
[NFTA_SET_ELEM_LIST_SET_ID
]) {
3924 set
= nf_tables_set_lookup_byid(net
,
3925 nla
[NFTA_SET_ELEM_LIST_SET_ID
],
3929 return PTR_ERR(set
);
3932 if (!list_empty(&set
->bindings
) && set
->flags
& NFT_SET_CONSTANT
)
3935 nla_for_each_nested(attr
, nla
[NFTA_SET_ELEM_LIST_ELEMENTS
], rem
) {
3936 err
= nft_add_set_elem(&ctx
, set
, attr
, nlh
->nlmsg_flags
);
3944 * nft_data_hold - hold a nft_data item
3946 * @data: struct nft_data to release
3947 * @type: type of data
3949 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
3950 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
3951 * NFT_GOTO verdicts. This function must be called on active data objects
3952 * from the second phase of the commit protocol.
3954 static void nft_data_hold(const struct nft_data
*data
, enum nft_data_types type
)
3956 if (type
== NFT_DATA_VERDICT
) {
3957 switch (data
->verdict
.code
) {
3960 data
->verdict
.chain
->use
++;
3966 static void nft_set_elem_activate(const struct net
*net
,
3967 const struct nft_set
*set
,
3968 struct nft_set_elem
*elem
)
3970 const struct nft_set_ext
*ext
= nft_set_elem_ext(set
, elem
->priv
);
3972 if (nft_set_ext_exists(ext
, NFT_SET_EXT_DATA
))
3973 nft_data_hold(nft_set_ext_data(ext
), set
->dtype
);
3974 if (nft_set_ext_exists(ext
, NFT_SET_EXT_OBJREF
))
3975 (*nft_set_ext_obj(ext
))->use
++;
3978 static void nft_set_elem_deactivate(const struct net
*net
,
3979 const struct nft_set
*set
,
3980 struct nft_set_elem
*elem
)
3982 const struct nft_set_ext
*ext
= nft_set_elem_ext(set
, elem
->priv
);
3984 if (nft_set_ext_exists(ext
, NFT_SET_EXT_DATA
))
3985 nft_data_release(nft_set_ext_data(ext
), set
->dtype
);
3986 if (nft_set_ext_exists(ext
, NFT_SET_EXT_OBJREF
))
3987 (*nft_set_ext_obj(ext
))->use
--;
3990 static int nft_del_setelem(struct nft_ctx
*ctx
, struct nft_set
*set
,
3991 const struct nlattr
*attr
)
3993 struct nlattr
*nla
[NFTA_SET_ELEM_MAX
+ 1];
3994 struct nft_set_ext_tmpl tmpl
;
3995 struct nft_data_desc desc
;
3996 struct nft_set_elem elem
;
3997 struct nft_set_ext
*ext
;
3998 struct nft_trans
*trans
;
4003 err
= nla_parse_nested(nla
, NFTA_SET_ELEM_MAX
, attr
,
4004 nft_set_elem_policy
, NULL
);
4009 if (nla
[NFTA_SET_ELEM_KEY
] == NULL
)
4012 nft_set_ext_prepare(&tmpl
);
4014 err
= nft_setelem_parse_flags(set
, nla
[NFTA_SET_ELEM_FLAGS
], &flags
);
4018 nft_set_ext_add(&tmpl
, NFT_SET_EXT_FLAGS
);
4020 err
= nft_data_init(ctx
, &elem
.key
.val
, sizeof(elem
.key
), &desc
,
4021 nla
[NFTA_SET_ELEM_KEY
]);
4026 if (desc
.type
!= NFT_DATA_VALUE
|| desc
.len
!= set
->klen
)
4029 nft_set_ext_add_length(&tmpl
, NFT_SET_EXT_KEY
, desc
.len
);
4032 elem
.priv
= nft_set_elem_init(set
, &tmpl
, elem
.key
.val
.data
, NULL
, 0,
4034 if (elem
.priv
== NULL
)
4037 ext
= nft_set_elem_ext(set
, elem
.priv
);
4039 *nft_set_ext_flags(ext
) = flags
;
4041 trans
= nft_trans_elem_alloc(ctx
, NFT_MSG_DELSETELEM
, set
);
4042 if (trans
== NULL
) {
4047 priv
= set
->ops
->deactivate(ctx
->net
, set
, &elem
);
4055 nft_set_elem_deactivate(ctx
->net
, set
, &elem
);
4057 nft_trans_elem(trans
) = elem
;
4058 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
4066 nft_data_release(&elem
.key
.val
, desc
.type
);
4071 static int nft_flush_set(const struct nft_ctx
*ctx
,
4072 struct nft_set
*set
,
4073 const struct nft_set_iter
*iter
,
4074 struct nft_set_elem
*elem
)
4076 struct nft_trans
*trans
;
4079 trans
= nft_trans_alloc_gfp(ctx
, NFT_MSG_DELSETELEM
,
4080 sizeof(struct nft_trans_elem
), GFP_ATOMIC
);
4084 if (!set
->ops
->flush(ctx
->net
, set
, elem
->priv
)) {
4090 nft_trans_elem_set(trans
) = set
;
4091 nft_trans_elem(trans
) = *elem
;
4092 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
4100 static int nf_tables_delsetelem(struct net
*net
, struct sock
*nlsk
,
4101 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
4102 const struct nlattr
* const nla
[],
4103 struct netlink_ext_ack
*extack
)
4105 u8 genmask
= nft_genmask_next(net
);
4106 const struct nlattr
*attr
;
4107 struct nft_set
*set
;
4111 err
= nft_ctx_init_from_elemattr(&ctx
, net
, skb
, nlh
, nla
, genmask
);
4115 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
],
4118 return PTR_ERR(set
);
4119 if (!list_empty(&set
->bindings
) && set
->flags
& NFT_SET_CONSTANT
)
4122 if (nla
[NFTA_SET_ELEM_LIST_ELEMENTS
] == NULL
) {
4123 struct nft_set_iter iter
= {
4125 .fn
= nft_flush_set
,
4127 set
->ops
->walk(&ctx
, set
, &iter
);
4132 nla_for_each_nested(attr
, nla
[NFTA_SET_ELEM_LIST_ELEMENTS
], rem
) {
4133 err
= nft_del_setelem(&ctx
, set
, attr
);
4142 void nft_set_gc_batch_release(struct rcu_head
*rcu
)
4144 struct nft_set_gc_batch
*gcb
;
4147 gcb
= container_of(rcu
, struct nft_set_gc_batch
, head
.rcu
);
4148 for (i
= 0; i
< gcb
->head
.cnt
; i
++)
4149 nft_set_elem_destroy(gcb
->head
.set
, gcb
->elems
[i
], true);
4152 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release
);
4154 struct nft_set_gc_batch
*nft_set_gc_batch_alloc(const struct nft_set
*set
,
4157 struct nft_set_gc_batch
*gcb
;
4159 gcb
= kzalloc(sizeof(*gcb
), gfp
);
4162 gcb
->head
.set
= set
;
4165 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc
);
4172 * nft_register_obj- register nf_tables stateful object type
4175 * Registers the object type for use with nf_tables. Returns zero on
4176 * success or a negative errno code otherwise.
4178 int nft_register_obj(struct nft_object_type
*obj_type
)
4180 if (obj_type
->type
== NFT_OBJECT_UNSPEC
)
4183 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
4184 list_add_rcu(&obj_type
->list
, &nf_tables_objects
);
4185 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
4188 EXPORT_SYMBOL_GPL(nft_register_obj
);
4191 * nft_unregister_obj - unregister nf_tables object type
4194 * Unregisters the object type for use with nf_tables.
4196 void nft_unregister_obj(struct nft_object_type
*obj_type
)
4198 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
4199 list_del_rcu(&obj_type
->list
);
4200 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
4202 EXPORT_SYMBOL_GPL(nft_unregister_obj
);
4204 struct nft_object
*nf_tables_obj_lookup(const struct nft_table
*table
,
4205 const struct nlattr
*nla
,
4206 u32 objtype
, u8 genmask
)
4208 struct nft_object
*obj
;
4210 list_for_each_entry(obj
, &table
->objects
, list
) {
4211 if (!nla_strcmp(nla
, obj
->name
) &&
4212 objtype
== obj
->type
->type
&&
4213 nft_active_genmask(obj
, genmask
))
4216 return ERR_PTR(-ENOENT
);
4218 EXPORT_SYMBOL_GPL(nf_tables_obj_lookup
);
4220 static const struct nla_policy nft_obj_policy
[NFTA_OBJ_MAX
+ 1] = {
4221 [NFTA_OBJ_TABLE
] = { .type
= NLA_STRING
,
4222 .len
= NFT_TABLE_MAXNAMELEN
- 1 },
4223 [NFTA_OBJ_NAME
] = { .type
= NLA_STRING
,
4224 .len
= NFT_OBJ_MAXNAMELEN
- 1 },
4225 [NFTA_OBJ_TYPE
] = { .type
= NLA_U32
},
4226 [NFTA_OBJ_DATA
] = { .type
= NLA_NESTED
},
4229 static struct nft_object
*nft_obj_init(const struct nft_ctx
*ctx
,
4230 const struct nft_object_type
*type
,
4231 const struct nlattr
*attr
)
4233 struct nlattr
*tb
[type
->maxattr
+ 1];
4234 struct nft_object
*obj
;
4238 err
= nla_parse_nested(tb
, type
->maxattr
, attr
, type
->policy
,
4243 memset(tb
, 0, sizeof(tb
[0]) * (type
->maxattr
+ 1));
4247 obj
= kzalloc(sizeof(struct nft_object
) + type
->size
, GFP_KERNEL
);
4251 err
= type
->init(ctx
, (const struct nlattr
* const *)tb
, obj
);
4260 return ERR_PTR(err
);
4263 static int nft_object_dump(struct sk_buff
*skb
, unsigned int attr
,
4264 struct nft_object
*obj
, bool reset
)
4266 struct nlattr
*nest
;
4268 nest
= nla_nest_start(skb
, attr
);
4270 goto nla_put_failure
;
4271 if (obj
->type
->dump(skb
, obj
, reset
) < 0)
4272 goto nla_put_failure
;
4273 nla_nest_end(skb
, nest
);
4280 static const struct nft_object_type
*__nft_obj_type_get(u32 objtype
)
4282 const struct nft_object_type
*type
;
4284 list_for_each_entry(type
, &nf_tables_objects
, list
) {
4285 if (objtype
== type
->type
)
4291 static const struct nft_object_type
*nft_obj_type_get(u32 objtype
)
4293 const struct nft_object_type
*type
;
4295 type
= __nft_obj_type_get(objtype
);
4296 if (type
!= NULL
&& try_module_get(type
->owner
))
4299 #ifdef CONFIG_MODULES
4301 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
4302 request_module("nft-obj-%u", objtype
);
4303 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
4304 if (__nft_obj_type_get(objtype
))
4305 return ERR_PTR(-EAGAIN
);
4308 return ERR_PTR(-ENOENT
);
4311 static int nf_tables_newobj(struct net
*net
, struct sock
*nlsk
,
4312 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
4313 const struct nlattr
* const nla
[],
4314 struct netlink_ext_ack
*extack
)
4316 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
4317 const struct nft_object_type
*type
;
4318 u8 genmask
= nft_genmask_next(net
);
4319 int family
= nfmsg
->nfgen_family
;
4320 struct nft_af_info
*afi
;
4321 struct nft_table
*table
;
4322 struct nft_object
*obj
;
4327 if (!nla
[NFTA_OBJ_TYPE
] ||
4328 !nla
[NFTA_OBJ_NAME
] ||
4329 !nla
[NFTA_OBJ_DATA
])
4332 afi
= nf_tables_afinfo_lookup(net
, family
, true);
4334 return PTR_ERR(afi
);
4336 table
= nf_tables_table_lookup(afi
, nla
[NFTA_OBJ_TABLE
], genmask
);
4338 return PTR_ERR(table
);
4340 objtype
= ntohl(nla_get_be32(nla
[NFTA_OBJ_TYPE
]));
4341 obj
= nf_tables_obj_lookup(table
, nla
[NFTA_OBJ_NAME
], objtype
, genmask
);
4348 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
4354 nft_ctx_init(&ctx
, net
, skb
, nlh
, afi
, table
, NULL
, nla
);
4356 type
= nft_obj_type_get(objtype
);
4358 return PTR_ERR(type
);
4360 obj
= nft_obj_init(&ctx
, type
, nla
[NFTA_OBJ_DATA
]);
4366 nla_strlcpy(obj
->name
, nla
[NFTA_OBJ_NAME
], NFT_OBJ_MAXNAMELEN
);
4368 err
= nft_trans_obj_add(&ctx
, NFT_MSG_NEWOBJ
, obj
);
4372 list_add_tail_rcu(&obj
->list
, &table
->objects
);
4376 if (obj
->type
->destroy
)
4377 obj
->type
->destroy(obj
);
4380 module_put(type
->owner
);
4384 static int nf_tables_fill_obj_info(struct sk_buff
*skb
, struct net
*net
,
4385 u32 portid
, u32 seq
, int event
, u32 flags
,
4386 int family
, const struct nft_table
*table
,
4387 struct nft_object
*obj
, bool reset
)
4389 struct nfgenmsg
*nfmsg
;
4390 struct nlmsghdr
*nlh
;
4392 event
= nfnl_msg_type(NFNL_SUBSYS_NFTABLES
, event
);
4393 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
), flags
);
4395 goto nla_put_failure
;
4397 nfmsg
= nlmsg_data(nlh
);
4398 nfmsg
->nfgen_family
= family
;
4399 nfmsg
->version
= NFNETLINK_V0
;
4400 nfmsg
->res_id
= htons(net
->nft
.base_seq
& 0xffff);
4402 if (nla_put_string(skb
, NFTA_OBJ_TABLE
, table
->name
) ||
4403 nla_put_string(skb
, NFTA_OBJ_NAME
, obj
->name
) ||
4404 nla_put_be32(skb
, NFTA_OBJ_TYPE
, htonl(obj
->type
->type
)) ||
4405 nla_put_be32(skb
, NFTA_OBJ_USE
, htonl(obj
->use
)) ||
4406 nft_object_dump(skb
, NFTA_OBJ_DATA
, obj
, reset
))
4407 goto nla_put_failure
;
4409 nlmsg_end(skb
, nlh
);
4413 nlmsg_trim(skb
, nlh
);
4417 struct nft_obj_filter
{
4418 char table
[NFT_OBJ_MAXNAMELEN
];
4422 static int nf_tables_dump_obj(struct sk_buff
*skb
, struct netlink_callback
*cb
)
4424 const struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
4425 const struct nft_af_info
*afi
;
4426 const struct nft_table
*table
;
4427 unsigned int idx
= 0, s_idx
= cb
->args
[0];
4428 struct nft_obj_filter
*filter
= cb
->data
;
4429 struct net
*net
= sock_net(skb
->sk
);
4430 int family
= nfmsg
->nfgen_family
;
4431 struct nft_object
*obj
;
4434 if (NFNL_MSG_TYPE(cb
->nlh
->nlmsg_type
) == NFT_MSG_GETOBJ_RESET
)
4438 cb
->seq
= net
->nft
.base_seq
;
4440 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
4441 if (family
!= NFPROTO_UNSPEC
&& family
!= afi
->family
)
4444 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
4445 list_for_each_entry_rcu(obj
, &table
->objects
, list
) {
4446 if (!nft_is_active(net
, obj
))
4451 memset(&cb
->args
[1], 0,
4452 sizeof(cb
->args
) - sizeof(cb
->args
[0]));
4453 if (filter
&& filter
->table
[0] &&
4454 strcmp(filter
->table
, table
->name
))
4457 filter
->type
!= NFT_OBJECT_UNSPEC
&&
4458 obj
->type
->type
!= filter
->type
)
4461 if (nf_tables_fill_obj_info(skb
, net
, NETLINK_CB(cb
->skb
).portid
,
4464 NLM_F_MULTI
| NLM_F_APPEND
,
4465 afi
->family
, table
, obj
, reset
) < 0)
4468 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
4481 static int nf_tables_dump_obj_done(struct netlink_callback
*cb
)
4488 static struct nft_obj_filter
*
4489 nft_obj_filter_alloc(const struct nlattr
* const nla
[])
4491 struct nft_obj_filter
*filter
;
4493 filter
= kzalloc(sizeof(*filter
), GFP_KERNEL
);
4495 return ERR_PTR(-ENOMEM
);
4497 if (nla
[NFTA_OBJ_TABLE
])
4498 nla_strlcpy(filter
->table
, nla
[NFTA_OBJ_TABLE
],
4499 NFT_TABLE_MAXNAMELEN
);
4500 if (nla
[NFTA_OBJ_TYPE
])
4501 filter
->type
= ntohl(nla_get_be32(nla
[NFTA_OBJ_TYPE
]));
4506 static int nf_tables_getobj(struct net
*net
, struct sock
*nlsk
,
4507 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
4508 const struct nlattr
* const nla
[],
4509 struct netlink_ext_ack
*extack
)
4511 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
4512 u8 genmask
= nft_genmask_cur(net
);
4513 int family
= nfmsg
->nfgen_family
;
4514 const struct nft_af_info
*afi
;
4515 const struct nft_table
*table
;
4516 struct nft_object
*obj
;
4517 struct sk_buff
*skb2
;
4522 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
4523 struct netlink_dump_control c
= {
4524 .dump
= nf_tables_dump_obj
,
4525 .done
= nf_tables_dump_obj_done
,
4528 if (nla
[NFTA_OBJ_TABLE
] ||
4529 nla
[NFTA_OBJ_TYPE
]) {
4530 struct nft_obj_filter
*filter
;
4532 filter
= nft_obj_filter_alloc(nla
);
4538 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
4541 if (!nla
[NFTA_OBJ_NAME
] ||
4542 !nla
[NFTA_OBJ_TYPE
])
4545 afi
= nf_tables_afinfo_lookup(net
, family
, false);
4547 return PTR_ERR(afi
);
4549 table
= nf_tables_table_lookup(afi
, nla
[NFTA_OBJ_TABLE
], genmask
);
4551 return PTR_ERR(table
);
4553 objtype
= ntohl(nla_get_be32(nla
[NFTA_OBJ_TYPE
]));
4554 obj
= nf_tables_obj_lookup(table
, nla
[NFTA_OBJ_NAME
], objtype
, genmask
);
4556 return PTR_ERR(obj
);
4558 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
4562 if (NFNL_MSG_TYPE(nlh
->nlmsg_type
) == NFT_MSG_GETOBJ_RESET
)
4565 err
= nf_tables_fill_obj_info(skb2
, net
, NETLINK_CB(skb
).portid
,
4566 nlh
->nlmsg_seq
, NFT_MSG_NEWOBJ
, 0,
4567 family
, table
, obj
, reset
);
4571 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
4577 static void nft_obj_destroy(struct nft_object
*obj
)
4579 if (obj
->type
->destroy
)
4580 obj
->type
->destroy(obj
);
4582 module_put(obj
->type
->owner
);
4586 static int nf_tables_delobj(struct net
*net
, struct sock
*nlsk
,
4587 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
4588 const struct nlattr
* const nla
[],
4589 struct netlink_ext_ack
*extack
)
4591 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
4592 u8 genmask
= nft_genmask_next(net
);
4593 int family
= nfmsg
->nfgen_family
;
4594 struct nft_af_info
*afi
;
4595 struct nft_table
*table
;
4596 struct nft_object
*obj
;
4600 if (!nla
[NFTA_OBJ_TYPE
] ||
4601 !nla
[NFTA_OBJ_NAME
])
4604 afi
= nf_tables_afinfo_lookup(net
, family
, true);
4606 return PTR_ERR(afi
);
4608 table
= nf_tables_table_lookup(afi
, nla
[NFTA_OBJ_TABLE
], genmask
);
4610 return PTR_ERR(table
);
4612 objtype
= ntohl(nla_get_be32(nla
[NFTA_OBJ_TYPE
]));
4613 obj
= nf_tables_obj_lookup(table
, nla
[NFTA_OBJ_NAME
], objtype
, genmask
);
4615 return PTR_ERR(obj
);
4619 nft_ctx_init(&ctx
, net
, skb
, nlh
, afi
, table
, NULL
, nla
);
4621 return nft_delobj(&ctx
, obj
);
4624 void nft_obj_notify(struct net
*net
, struct nft_table
*table
,
4625 struct nft_object
*obj
, u32 portid
, u32 seq
, int event
,
4626 int family
, int report
, gfp_t gfp
)
4628 struct sk_buff
*skb
;
4632 !nfnetlink_has_listeners(net
, NFNLGRP_NFTABLES
))
4635 skb
= nlmsg_new(NLMSG_GOODSIZE
, gfp
);
4639 err
= nf_tables_fill_obj_info(skb
, net
, portid
, seq
, event
, 0, family
,
4646 nfnetlink_send(skb
, net
, portid
, NFNLGRP_NFTABLES
, report
, gfp
);
4649 nfnetlink_set_err(net
, portid
, NFNLGRP_NFTABLES
, -ENOBUFS
);
4651 EXPORT_SYMBOL_GPL(nft_obj_notify
);
4653 static void nf_tables_obj_notify(const struct nft_ctx
*ctx
,
4654 struct nft_object
*obj
, int event
)
4656 nft_obj_notify(ctx
->net
, ctx
->table
, obj
, ctx
->portid
, ctx
->seq
, event
,
4657 ctx
->afi
->family
, ctx
->report
, GFP_KERNEL
);
4660 static int nf_tables_fill_gen_info(struct sk_buff
*skb
, struct net
*net
,
4661 u32 portid
, u32 seq
)
4663 struct nlmsghdr
*nlh
;
4664 struct nfgenmsg
*nfmsg
;
4665 int event
= nfnl_msg_type(NFNL_SUBSYS_NFTABLES
, NFT_MSG_NEWGEN
);
4667 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
), 0);
4669 goto nla_put_failure
;
4671 nfmsg
= nlmsg_data(nlh
);
4672 nfmsg
->nfgen_family
= AF_UNSPEC
;
4673 nfmsg
->version
= NFNETLINK_V0
;
4674 nfmsg
->res_id
= htons(net
->nft
.base_seq
& 0xffff);
4676 if (nla_put_be32(skb
, NFTA_GEN_ID
, htonl(net
->nft
.base_seq
)))
4677 goto nla_put_failure
;
4679 nlmsg_end(skb
, nlh
);
4683 nlmsg_trim(skb
, nlh
);
4687 static void nf_tables_gen_notify(struct net
*net
, struct sk_buff
*skb
,
4690 struct nlmsghdr
*nlh
= nlmsg_hdr(skb
);
4691 struct sk_buff
*skb2
;
4694 if (nlmsg_report(nlh
) &&
4695 !nfnetlink_has_listeners(net
, NFNLGRP_NFTABLES
))
4698 skb2
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
4702 err
= nf_tables_fill_gen_info(skb2
, net
, NETLINK_CB(skb
).portid
,
4709 nfnetlink_send(skb2
, net
, NETLINK_CB(skb
).portid
, NFNLGRP_NFTABLES
,
4710 nlmsg_report(nlh
), GFP_KERNEL
);
4713 nfnetlink_set_err(net
, NETLINK_CB(skb
).portid
, NFNLGRP_NFTABLES
,
4717 static int nf_tables_getgen(struct net
*net
, struct sock
*nlsk
,
4718 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
4719 const struct nlattr
* const nla
[],
4720 struct netlink_ext_ack
*extack
)
4722 struct sk_buff
*skb2
;
4725 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
4729 err
= nf_tables_fill_gen_info(skb2
, net
, NETLINK_CB(skb
).portid
,
4734 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
4740 static const struct nfnl_callback nf_tables_cb
[NFT_MSG_MAX
] = {
4741 [NFT_MSG_NEWTABLE
] = {
4742 .call_batch
= nf_tables_newtable
,
4743 .attr_count
= NFTA_TABLE_MAX
,
4744 .policy
= nft_table_policy
,
4746 [NFT_MSG_GETTABLE
] = {
4747 .call
= nf_tables_gettable
,
4748 .attr_count
= NFTA_TABLE_MAX
,
4749 .policy
= nft_table_policy
,
4751 [NFT_MSG_DELTABLE
] = {
4752 .call_batch
= nf_tables_deltable
,
4753 .attr_count
= NFTA_TABLE_MAX
,
4754 .policy
= nft_table_policy
,
4756 [NFT_MSG_NEWCHAIN
] = {
4757 .call_batch
= nf_tables_newchain
,
4758 .attr_count
= NFTA_CHAIN_MAX
,
4759 .policy
= nft_chain_policy
,
4761 [NFT_MSG_GETCHAIN
] = {
4762 .call
= nf_tables_getchain
,
4763 .attr_count
= NFTA_CHAIN_MAX
,
4764 .policy
= nft_chain_policy
,
4766 [NFT_MSG_DELCHAIN
] = {
4767 .call_batch
= nf_tables_delchain
,
4768 .attr_count
= NFTA_CHAIN_MAX
,
4769 .policy
= nft_chain_policy
,
4771 [NFT_MSG_NEWRULE
] = {
4772 .call_batch
= nf_tables_newrule
,
4773 .attr_count
= NFTA_RULE_MAX
,
4774 .policy
= nft_rule_policy
,
4776 [NFT_MSG_GETRULE
] = {
4777 .call
= nf_tables_getrule
,
4778 .attr_count
= NFTA_RULE_MAX
,
4779 .policy
= nft_rule_policy
,
4781 [NFT_MSG_DELRULE
] = {
4782 .call_batch
= nf_tables_delrule
,
4783 .attr_count
= NFTA_RULE_MAX
,
4784 .policy
= nft_rule_policy
,
4786 [NFT_MSG_NEWSET
] = {
4787 .call_batch
= nf_tables_newset
,
4788 .attr_count
= NFTA_SET_MAX
,
4789 .policy
= nft_set_policy
,
4791 [NFT_MSG_GETSET
] = {
4792 .call
= nf_tables_getset
,
4793 .attr_count
= NFTA_SET_MAX
,
4794 .policy
= nft_set_policy
,
4796 [NFT_MSG_DELSET
] = {
4797 .call_batch
= nf_tables_delset
,
4798 .attr_count
= NFTA_SET_MAX
,
4799 .policy
= nft_set_policy
,
4801 [NFT_MSG_NEWSETELEM
] = {
4802 .call_batch
= nf_tables_newsetelem
,
4803 .attr_count
= NFTA_SET_ELEM_LIST_MAX
,
4804 .policy
= nft_set_elem_list_policy
,
4806 [NFT_MSG_GETSETELEM
] = {
4807 .call
= nf_tables_getsetelem
,
4808 .attr_count
= NFTA_SET_ELEM_LIST_MAX
,
4809 .policy
= nft_set_elem_list_policy
,
4811 [NFT_MSG_DELSETELEM
] = {
4812 .call_batch
= nf_tables_delsetelem
,
4813 .attr_count
= NFTA_SET_ELEM_LIST_MAX
,
4814 .policy
= nft_set_elem_list_policy
,
4816 [NFT_MSG_GETGEN
] = {
4817 .call
= nf_tables_getgen
,
4819 [NFT_MSG_NEWOBJ
] = {
4820 .call_batch
= nf_tables_newobj
,
4821 .attr_count
= NFTA_OBJ_MAX
,
4822 .policy
= nft_obj_policy
,
4824 [NFT_MSG_GETOBJ
] = {
4825 .call
= nf_tables_getobj
,
4826 .attr_count
= NFTA_OBJ_MAX
,
4827 .policy
= nft_obj_policy
,
4829 [NFT_MSG_DELOBJ
] = {
4830 .call_batch
= nf_tables_delobj
,
4831 .attr_count
= NFTA_OBJ_MAX
,
4832 .policy
= nft_obj_policy
,
4834 [NFT_MSG_GETOBJ_RESET
] = {
4835 .call
= nf_tables_getobj
,
4836 .attr_count
= NFTA_OBJ_MAX
,
4837 .policy
= nft_obj_policy
,
4841 static void nft_chain_commit_update(struct nft_trans
*trans
)
4843 struct nft_base_chain
*basechain
;
4845 if (nft_trans_chain_name(trans
)[0])
4846 strcpy(trans
->ctx
.chain
->name
, nft_trans_chain_name(trans
));
4848 if (!nft_is_base_chain(trans
->ctx
.chain
))
4851 basechain
= nft_base_chain(trans
->ctx
.chain
);
4852 nft_chain_stats_replace(basechain
, nft_trans_chain_stats(trans
));
4854 switch (nft_trans_chain_policy(trans
)) {
4857 basechain
->policy
= nft_trans_chain_policy(trans
);
4862 static void nf_tables_commit_release(struct nft_trans
*trans
)
4864 switch (trans
->msg_type
) {
4865 case NFT_MSG_DELTABLE
:
4866 nf_tables_table_destroy(&trans
->ctx
);
4868 case NFT_MSG_DELCHAIN
:
4869 nf_tables_chain_destroy(trans
->ctx
.chain
);
4871 case NFT_MSG_DELRULE
:
4872 nf_tables_rule_destroy(&trans
->ctx
, nft_trans_rule(trans
));
4874 case NFT_MSG_DELSET
:
4875 nft_set_destroy(nft_trans_set(trans
));
4877 case NFT_MSG_DELSETELEM
:
4878 nf_tables_set_elem_destroy(nft_trans_elem_set(trans
),
4879 nft_trans_elem(trans
).priv
);
4881 case NFT_MSG_DELOBJ
:
4882 nft_obj_destroy(nft_trans_obj(trans
));
4888 static int nf_tables_commit(struct net
*net
, struct sk_buff
*skb
)
4890 struct nft_trans
*trans
, *next
;
4891 struct nft_trans_elem
*te
;
4893 /* Bump generation counter, invalidate any dump in progress */
4894 while (++net
->nft
.base_seq
== 0);
4896 /* A new generation has just started */
4897 net
->nft
.gencursor
= nft_gencursor_next(net
);
4899 /* Make sure all packets have left the previous generation before
4900 * purging old rules.
4904 list_for_each_entry_safe(trans
, next
, &net
->nft
.commit_list
, list
) {
4905 switch (trans
->msg_type
) {
4906 case NFT_MSG_NEWTABLE
:
4907 if (nft_trans_table_update(trans
)) {
4908 if (!nft_trans_table_enable(trans
)) {
4909 nf_tables_table_disable(net
,
4912 trans
->ctx
.table
->flags
|= NFT_TABLE_F_DORMANT
;
4915 nft_clear(net
, trans
->ctx
.table
);
4917 nf_tables_table_notify(&trans
->ctx
, NFT_MSG_NEWTABLE
);
4918 nft_trans_destroy(trans
);
4920 case NFT_MSG_DELTABLE
:
4921 list_del_rcu(&trans
->ctx
.table
->list
);
4922 nf_tables_table_notify(&trans
->ctx
, NFT_MSG_DELTABLE
);
4924 case NFT_MSG_NEWCHAIN
:
4925 if (nft_trans_chain_update(trans
))
4926 nft_chain_commit_update(trans
);
4928 nft_clear(net
, trans
->ctx
.chain
);
4930 nf_tables_chain_notify(&trans
->ctx
, NFT_MSG_NEWCHAIN
);
4931 nft_trans_destroy(trans
);
4933 case NFT_MSG_DELCHAIN
:
4934 list_del_rcu(&trans
->ctx
.chain
->list
);
4935 nf_tables_chain_notify(&trans
->ctx
, NFT_MSG_DELCHAIN
);
4936 nf_tables_unregister_hooks(trans
->ctx
.net
,
4939 trans
->ctx
.afi
->nops
);
4941 case NFT_MSG_NEWRULE
:
4942 nft_clear(trans
->ctx
.net
, nft_trans_rule(trans
));
4943 nf_tables_rule_notify(&trans
->ctx
,
4944 nft_trans_rule(trans
),
4946 nft_trans_destroy(trans
);
4948 case NFT_MSG_DELRULE
:
4949 list_del_rcu(&nft_trans_rule(trans
)->list
);
4950 nf_tables_rule_notify(&trans
->ctx
,
4951 nft_trans_rule(trans
),
4954 case NFT_MSG_NEWSET
:
4955 nft_clear(net
, nft_trans_set(trans
));
4956 /* This avoids hitting -EBUSY when deleting the table
4957 * from the transaction.
4959 if (nft_trans_set(trans
)->flags
& NFT_SET_ANONYMOUS
&&
4960 !list_empty(&nft_trans_set(trans
)->bindings
))
4961 trans
->ctx
.table
->use
--;
4963 nf_tables_set_notify(&trans
->ctx
, nft_trans_set(trans
),
4964 NFT_MSG_NEWSET
, GFP_KERNEL
);
4965 nft_trans_destroy(trans
);
4967 case NFT_MSG_DELSET
:
4968 list_del_rcu(&nft_trans_set(trans
)->list
);
4969 nf_tables_set_notify(&trans
->ctx
, nft_trans_set(trans
),
4970 NFT_MSG_DELSET
, GFP_KERNEL
);
4972 case NFT_MSG_NEWSETELEM
:
4973 te
= (struct nft_trans_elem
*)trans
->data
;
4975 te
->set
->ops
->activate(net
, te
->set
, &te
->elem
);
4976 nf_tables_setelem_notify(&trans
->ctx
, te
->set
,
4978 NFT_MSG_NEWSETELEM
, 0);
4979 nft_trans_destroy(trans
);
4981 case NFT_MSG_DELSETELEM
:
4982 te
= (struct nft_trans_elem
*)trans
->data
;
4984 nf_tables_setelem_notify(&trans
->ctx
, te
->set
,
4986 NFT_MSG_DELSETELEM
, 0);
4987 te
->set
->ops
->remove(net
, te
->set
, &te
->elem
);
4988 atomic_dec(&te
->set
->nelems
);
4991 case NFT_MSG_NEWOBJ
:
4992 nft_clear(net
, nft_trans_obj(trans
));
4993 nf_tables_obj_notify(&trans
->ctx
, nft_trans_obj(trans
),
4995 nft_trans_destroy(trans
);
4997 case NFT_MSG_DELOBJ
:
4998 list_del_rcu(&nft_trans_obj(trans
)->list
);
4999 nf_tables_obj_notify(&trans
->ctx
, nft_trans_obj(trans
),
5007 list_for_each_entry_safe(trans
, next
, &net
->nft
.commit_list
, list
) {
5008 list_del(&trans
->list
);
5009 nf_tables_commit_release(trans
);
5012 nf_tables_gen_notify(net
, skb
, NFT_MSG_NEWGEN
);
5017 static void nf_tables_abort_release(struct nft_trans
*trans
)
5019 switch (trans
->msg_type
) {
5020 case NFT_MSG_NEWTABLE
:
5021 nf_tables_table_destroy(&trans
->ctx
);
5023 case NFT_MSG_NEWCHAIN
:
5024 nf_tables_chain_destroy(trans
->ctx
.chain
);
5026 case NFT_MSG_NEWRULE
:
5027 nf_tables_rule_destroy(&trans
->ctx
, nft_trans_rule(trans
));
5029 case NFT_MSG_NEWSET
:
5030 nft_set_destroy(nft_trans_set(trans
));
5032 case NFT_MSG_NEWSETELEM
:
5033 nft_set_elem_destroy(nft_trans_elem_set(trans
),
5034 nft_trans_elem(trans
).priv
, true);
5036 case NFT_MSG_NEWOBJ
:
5037 nft_obj_destroy(nft_trans_obj(trans
));
5043 static int nf_tables_abort(struct net
*net
, struct sk_buff
*skb
)
5045 struct nft_trans
*trans
, *next
;
5046 struct nft_trans_elem
*te
;
5048 list_for_each_entry_safe_reverse(trans
, next
, &net
->nft
.commit_list
,
5050 switch (trans
->msg_type
) {
5051 case NFT_MSG_NEWTABLE
:
5052 if (nft_trans_table_update(trans
)) {
5053 if (nft_trans_table_enable(trans
)) {
5054 nf_tables_table_disable(net
,
5057 trans
->ctx
.table
->flags
|= NFT_TABLE_F_DORMANT
;
5059 nft_trans_destroy(trans
);
5061 list_del_rcu(&trans
->ctx
.table
->list
);
5064 case NFT_MSG_DELTABLE
:
5065 nft_clear(trans
->ctx
.net
, trans
->ctx
.table
);
5066 nft_trans_destroy(trans
);
5068 case NFT_MSG_NEWCHAIN
:
5069 if (nft_trans_chain_update(trans
)) {
5070 free_percpu(nft_trans_chain_stats(trans
));
5072 nft_trans_destroy(trans
);
5074 trans
->ctx
.table
->use
--;
5075 list_del_rcu(&trans
->ctx
.chain
->list
);
5076 nf_tables_unregister_hooks(trans
->ctx
.net
,
5079 trans
->ctx
.afi
->nops
);
5082 case NFT_MSG_DELCHAIN
:
5083 trans
->ctx
.table
->use
++;
5084 nft_clear(trans
->ctx
.net
, trans
->ctx
.chain
);
5085 nft_trans_destroy(trans
);
5087 case NFT_MSG_NEWRULE
:
5088 trans
->ctx
.chain
->use
--;
5089 list_del_rcu(&nft_trans_rule(trans
)->list
);
5091 case NFT_MSG_DELRULE
:
5092 trans
->ctx
.chain
->use
++;
5093 nft_clear(trans
->ctx
.net
, nft_trans_rule(trans
));
5094 nft_trans_destroy(trans
);
5096 case NFT_MSG_NEWSET
:
5097 trans
->ctx
.table
->use
--;
5098 list_del_rcu(&nft_trans_set(trans
)->list
);
5100 case NFT_MSG_DELSET
:
5101 trans
->ctx
.table
->use
++;
5102 nft_clear(trans
->ctx
.net
, nft_trans_set(trans
));
5103 nft_trans_destroy(trans
);
5105 case NFT_MSG_NEWSETELEM
:
5106 te
= (struct nft_trans_elem
*)trans
->data
;
5108 te
->set
->ops
->remove(net
, te
->set
, &te
->elem
);
5109 atomic_dec(&te
->set
->nelems
);
5111 case NFT_MSG_DELSETELEM
:
5112 te
= (struct nft_trans_elem
*)trans
->data
;
5114 nft_set_elem_activate(net
, te
->set
, &te
->elem
);
5115 te
->set
->ops
->activate(net
, te
->set
, &te
->elem
);
5118 nft_trans_destroy(trans
);
5120 case NFT_MSG_NEWOBJ
:
5121 trans
->ctx
.table
->use
--;
5122 list_del_rcu(&nft_trans_obj(trans
)->list
);
5124 case NFT_MSG_DELOBJ
:
5125 trans
->ctx
.table
->use
++;
5126 nft_clear(trans
->ctx
.net
, nft_trans_obj(trans
));
5127 nft_trans_destroy(trans
);
5134 list_for_each_entry_safe_reverse(trans
, next
,
5135 &net
->nft
.commit_list
, list
) {
5136 list_del(&trans
->list
);
5137 nf_tables_abort_release(trans
);
5143 static bool nf_tables_valid_genid(struct net
*net
, u32 genid
)
5145 return net
->nft
.base_seq
== genid
;
5148 static const struct nfnetlink_subsystem nf_tables_subsys
= {
5149 .name
= "nf_tables",
5150 .subsys_id
= NFNL_SUBSYS_NFTABLES
,
5151 .cb_count
= NFT_MSG_MAX
,
5153 .commit
= nf_tables_commit
,
5154 .abort
= nf_tables_abort
,
5155 .valid_genid
= nf_tables_valid_genid
,
5158 int nft_chain_validate_dependency(const struct nft_chain
*chain
,
5159 enum nft_chain_type type
)
5161 const struct nft_base_chain
*basechain
;
5163 if (nft_is_base_chain(chain
)) {
5164 basechain
= nft_base_chain(chain
);
5165 if (basechain
->type
->type
!= type
)
5170 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency
);
5172 int nft_chain_validate_hooks(const struct nft_chain
*chain
,
5173 unsigned int hook_flags
)
5175 struct nft_base_chain
*basechain
;
5177 if (nft_is_base_chain(chain
)) {
5178 basechain
= nft_base_chain(chain
);
5180 if ((1 << basechain
->ops
[0].hooknum
) & hook_flags
)
5188 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks
);
5191 * Loop detection - walk through the ruleset beginning at the destination chain
5192 * of a new jump until either the source chain is reached (loop) or all
5193 * reachable chains have been traversed.
5195 * The loop check is performed whenever a new jump verdict is added to an
5196 * expression or verdict map or a verdict map is bound to a new chain.
5199 static int nf_tables_check_loops(const struct nft_ctx
*ctx
,
5200 const struct nft_chain
*chain
);
5202 static int nf_tables_loop_check_setelem(const struct nft_ctx
*ctx
,
5203 struct nft_set
*set
,
5204 const struct nft_set_iter
*iter
,
5205 struct nft_set_elem
*elem
)
5207 const struct nft_set_ext
*ext
= nft_set_elem_ext(set
, elem
->priv
);
5208 const struct nft_data
*data
;
5210 if (nft_set_ext_exists(ext
, NFT_SET_EXT_FLAGS
) &&
5211 *nft_set_ext_flags(ext
) & NFT_SET_ELEM_INTERVAL_END
)
5214 data
= nft_set_ext_data(ext
);
5215 switch (data
->verdict
.code
) {
5218 return nf_tables_check_loops(ctx
, data
->verdict
.chain
);
5224 static int nf_tables_check_loops(const struct nft_ctx
*ctx
,
5225 const struct nft_chain
*chain
)
5227 const struct nft_rule
*rule
;
5228 const struct nft_expr
*expr
, *last
;
5229 struct nft_set
*set
;
5230 struct nft_set_binding
*binding
;
5231 struct nft_set_iter iter
;
5233 if (ctx
->chain
== chain
)
5236 list_for_each_entry(rule
, &chain
->rules
, list
) {
5237 nft_rule_for_each_expr(expr
, last
, rule
) {
5238 const struct nft_data
*data
= NULL
;
5241 if (!expr
->ops
->validate
)
5244 err
= expr
->ops
->validate(ctx
, expr
, &data
);
5251 switch (data
->verdict
.code
) {
5254 err
= nf_tables_check_loops(ctx
,
5255 data
->verdict
.chain
);
5264 list_for_each_entry(set
, &ctx
->table
->sets
, list
) {
5265 if (!nft_is_active_next(ctx
->net
, set
))
5267 if (!(set
->flags
& NFT_SET_MAP
) ||
5268 set
->dtype
!= NFT_DATA_VERDICT
)
5271 list_for_each_entry(binding
, &set
->bindings
, list
) {
5272 if (!(binding
->flags
& NFT_SET_MAP
) ||
5273 binding
->chain
!= chain
)
5276 iter
.genmask
= nft_genmask_next(ctx
->net
);
5280 iter
.fn
= nf_tables_loop_check_setelem
;
5282 set
->ops
->walk(ctx
, set
, &iter
);
5292 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
5294 * @attr: netlink attribute to fetch value from
5295 * @max: maximum value to be stored in dest
5296 * @dest: pointer to the variable
5298 * Parse, check and store a given u32 netlink attribute into variable.
5299 * This function returns -ERANGE if the value goes over maximum value.
5300 * Otherwise a 0 is returned and the attribute value is stored in the
5301 * destination variable.
5303 int nft_parse_u32_check(const struct nlattr
*attr
, int max
, u32
*dest
)
5307 val
= ntohl(nla_get_be32(attr
));
5314 EXPORT_SYMBOL_GPL(nft_parse_u32_check
);
5317 * nft_parse_register - parse a register value from a netlink attribute
5319 * @attr: netlink attribute
5321 * Parse and translate a register value from a netlink attribute.
5322 * Registers used to be 128 bit wide, these register numbers will be
5323 * mapped to the corresponding 32 bit register numbers.
5325 unsigned int nft_parse_register(const struct nlattr
*attr
)
5329 reg
= ntohl(nla_get_be32(attr
));
5331 case NFT_REG_VERDICT
...NFT_REG_4
:
5332 return reg
* NFT_REG_SIZE
/ NFT_REG32_SIZE
;
5334 return reg
+ NFT_REG_SIZE
/ NFT_REG32_SIZE
- NFT_REG32_00
;
5337 EXPORT_SYMBOL_GPL(nft_parse_register
);
5340 * nft_dump_register - dump a register value to a netlink attribute
5342 * @skb: socket buffer
5343 * @attr: attribute number
5344 * @reg: register number
5346 * Construct a netlink attribute containing the register number. For
5347 * compatibility reasons, register numbers being a multiple of 4 are
5348 * translated to the corresponding 128 bit register numbers.
5350 int nft_dump_register(struct sk_buff
*skb
, unsigned int attr
, unsigned int reg
)
5352 if (reg
% (NFT_REG_SIZE
/ NFT_REG32_SIZE
) == 0)
5353 reg
= reg
/ (NFT_REG_SIZE
/ NFT_REG32_SIZE
);
5355 reg
= reg
- NFT_REG_SIZE
/ NFT_REG32_SIZE
+ NFT_REG32_00
;
5357 return nla_put_be32(skb
, attr
, htonl(reg
));
5359 EXPORT_SYMBOL_GPL(nft_dump_register
);
5362 * nft_validate_register_load - validate a load from a register
5364 * @reg: the register number
5365 * @len: the length of the data
5367 * Validate that the input register is one of the general purpose
5368 * registers and that the length of the load is within the bounds.
5370 int nft_validate_register_load(enum nft_registers reg
, unsigned int len
)
5372 if (reg
< NFT_REG_1
* NFT_REG_SIZE
/ NFT_REG32_SIZE
)
5376 if (reg
* NFT_REG32_SIZE
+ len
> FIELD_SIZEOF(struct nft_regs
, data
))
5381 EXPORT_SYMBOL_GPL(nft_validate_register_load
);
5384 * nft_validate_register_store - validate an expressions' register store
5386 * @ctx: context of the expression performing the load
5387 * @reg: the destination register number
5388 * @data: the data to load
5389 * @type: the data type
5390 * @len: the length of the data
5392 * Validate that a data load uses the appropriate data type for
5393 * the destination register and the length is within the bounds.
5394 * A value of NULL for the data means that its runtime gathered
5397 int nft_validate_register_store(const struct nft_ctx
*ctx
,
5398 enum nft_registers reg
,
5399 const struct nft_data
*data
,
5400 enum nft_data_types type
, unsigned int len
)
5405 case NFT_REG_VERDICT
:
5406 if (type
!= NFT_DATA_VERDICT
)
5410 (data
->verdict
.code
== NFT_GOTO
||
5411 data
->verdict
.code
== NFT_JUMP
)) {
5412 err
= nf_tables_check_loops(ctx
, data
->verdict
.chain
);
5416 if (ctx
->chain
->level
+ 1 >
5417 data
->verdict
.chain
->level
) {
5418 if (ctx
->chain
->level
+ 1 == NFT_JUMP_STACK_SIZE
)
5420 data
->verdict
.chain
->level
= ctx
->chain
->level
+ 1;
5426 if (reg
< NFT_REG_1
* NFT_REG_SIZE
/ NFT_REG32_SIZE
)
5430 if (reg
* NFT_REG32_SIZE
+ len
>
5431 FIELD_SIZEOF(struct nft_regs
, data
))
5434 if (data
!= NULL
&& type
!= NFT_DATA_VALUE
)
5439 EXPORT_SYMBOL_GPL(nft_validate_register_store
);
5441 static const struct nla_policy nft_verdict_policy
[NFTA_VERDICT_MAX
+ 1] = {
5442 [NFTA_VERDICT_CODE
] = { .type
= NLA_U32
},
5443 [NFTA_VERDICT_CHAIN
] = { .type
= NLA_STRING
,
5444 .len
= NFT_CHAIN_MAXNAMELEN
- 1 },
5447 static int nft_verdict_init(const struct nft_ctx
*ctx
, struct nft_data
*data
,
5448 struct nft_data_desc
*desc
, const struct nlattr
*nla
)
5450 u8 genmask
= nft_genmask_next(ctx
->net
);
5451 struct nlattr
*tb
[NFTA_VERDICT_MAX
+ 1];
5452 struct nft_chain
*chain
;
5455 err
= nla_parse_nested(tb
, NFTA_VERDICT_MAX
, nla
, nft_verdict_policy
,
5460 if (!tb
[NFTA_VERDICT_CODE
])
5462 data
->verdict
.code
= ntohl(nla_get_be32(tb
[NFTA_VERDICT_CODE
]));
5464 switch (data
->verdict
.code
) {
5466 switch (data
->verdict
.code
& NF_VERDICT_MASK
) {
5481 if (!tb
[NFTA_VERDICT_CHAIN
])
5483 chain
= nf_tables_chain_lookup(ctx
->table
,
5484 tb
[NFTA_VERDICT_CHAIN
], genmask
);
5486 return PTR_ERR(chain
);
5487 if (nft_is_base_chain(chain
))
5491 data
->verdict
.chain
= chain
;
5495 desc
->len
= sizeof(data
->verdict
);
5496 desc
->type
= NFT_DATA_VERDICT
;
5500 static void nft_verdict_uninit(const struct nft_data
*data
)
5502 switch (data
->verdict
.code
) {
5505 data
->verdict
.chain
->use
--;
5510 int nft_verdict_dump(struct sk_buff
*skb
, int type
, const struct nft_verdict
*v
)
5512 struct nlattr
*nest
;
5514 nest
= nla_nest_start(skb
, type
);
5516 goto nla_put_failure
;
5518 if (nla_put_be32(skb
, NFTA_VERDICT_CODE
, htonl(v
->code
)))
5519 goto nla_put_failure
;
5524 if (nla_put_string(skb
, NFTA_VERDICT_CHAIN
,
5526 goto nla_put_failure
;
5528 nla_nest_end(skb
, nest
);
5535 static int nft_value_init(const struct nft_ctx
*ctx
,
5536 struct nft_data
*data
, unsigned int size
,
5537 struct nft_data_desc
*desc
, const struct nlattr
*nla
)
5547 nla_memcpy(data
->data
, nla
, len
);
5548 desc
->type
= NFT_DATA_VALUE
;
5553 static int nft_value_dump(struct sk_buff
*skb
, const struct nft_data
*data
,
5556 return nla_put(skb
, NFTA_DATA_VALUE
, len
, data
->data
);
5559 static const struct nla_policy nft_data_policy
[NFTA_DATA_MAX
+ 1] = {
5560 [NFTA_DATA_VALUE
] = { .type
= NLA_BINARY
},
5561 [NFTA_DATA_VERDICT
] = { .type
= NLA_NESTED
},
5565 * nft_data_init - parse nf_tables data netlink attributes
5567 * @ctx: context of the expression using the data
5568 * @data: destination struct nft_data
5569 * @size: maximum data length
5570 * @desc: data description
5571 * @nla: netlink attribute containing data
5573 * Parse the netlink data attributes and initialize a struct nft_data.
5574 * The type and length of data are returned in the data description.
5576 * The caller can indicate that it only wants to accept data of type
5577 * NFT_DATA_VALUE by passing NULL for the ctx argument.
5579 int nft_data_init(const struct nft_ctx
*ctx
,
5580 struct nft_data
*data
, unsigned int size
,
5581 struct nft_data_desc
*desc
, const struct nlattr
*nla
)
5583 struct nlattr
*tb
[NFTA_DATA_MAX
+ 1];
5586 err
= nla_parse_nested(tb
, NFTA_DATA_MAX
, nla
, nft_data_policy
, NULL
);
5590 if (tb
[NFTA_DATA_VALUE
])
5591 return nft_value_init(ctx
, data
, size
, desc
,
5592 tb
[NFTA_DATA_VALUE
]);
5593 if (tb
[NFTA_DATA_VERDICT
] && ctx
!= NULL
)
5594 return nft_verdict_init(ctx
, data
, desc
, tb
[NFTA_DATA_VERDICT
]);
5597 EXPORT_SYMBOL_GPL(nft_data_init
);
5600 * nft_data_release - release a nft_data item
5602 * @data: struct nft_data to release
5603 * @type: type of data
5605 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5606 * all others need to be released by calling this function.
5608 void nft_data_release(const struct nft_data
*data
, enum nft_data_types type
)
5610 if (type
< NFT_DATA_VERDICT
)
5613 case NFT_DATA_VERDICT
:
5614 return nft_verdict_uninit(data
);
5619 EXPORT_SYMBOL_GPL(nft_data_release
);
5621 int nft_data_dump(struct sk_buff
*skb
, int attr
, const struct nft_data
*data
,
5622 enum nft_data_types type
, unsigned int len
)
5624 struct nlattr
*nest
;
5627 nest
= nla_nest_start(skb
, attr
);
5632 case NFT_DATA_VALUE
:
5633 err
= nft_value_dump(skb
, data
, len
);
5635 case NFT_DATA_VERDICT
:
5636 err
= nft_verdict_dump(skb
, NFTA_DATA_VERDICT
, &data
->verdict
);
5643 nla_nest_end(skb
, nest
);
5646 EXPORT_SYMBOL_GPL(nft_data_dump
);
5648 static int __net_init
nf_tables_init_net(struct net
*net
)
5650 INIT_LIST_HEAD(&net
->nft
.af_info
);
5651 INIT_LIST_HEAD(&net
->nft
.commit_list
);
5652 net
->nft
.base_seq
= 1;
5656 int __nft_release_basechain(struct nft_ctx
*ctx
)
5658 struct nft_rule
*rule
, *nr
;
5660 BUG_ON(!nft_is_base_chain(ctx
->chain
));
5662 nf_tables_unregister_hooks(ctx
->net
, ctx
->chain
->table
, ctx
->chain
,
5664 list_for_each_entry_safe(rule
, nr
, &ctx
->chain
->rules
, list
) {
5665 list_del(&rule
->list
);
5667 nf_tables_rule_destroy(ctx
, rule
);
5669 list_del(&ctx
->chain
->list
);
5671 nf_tables_chain_destroy(ctx
->chain
);
5675 EXPORT_SYMBOL_GPL(__nft_release_basechain
);
5677 /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
5678 static void __nft_release_afinfo(struct net
*net
, struct nft_af_info
*afi
)
5680 struct nft_table
*table
, *nt
;
5681 struct nft_chain
*chain
, *nc
;
5682 struct nft_object
*obj
, *ne
;
5683 struct nft_rule
*rule
, *nr
;
5684 struct nft_set
*set
, *ns
;
5685 struct nft_ctx ctx
= {
5690 list_for_each_entry_safe(table
, nt
, &afi
->tables
, list
) {
5691 list_for_each_entry(chain
, &table
->chains
, list
)
5692 nf_tables_unregister_hooks(net
, table
, chain
,
5694 /* No packets are walking on these chains anymore. */
5696 list_for_each_entry(chain
, &table
->chains
, list
) {
5698 list_for_each_entry_safe(rule
, nr
, &chain
->rules
, list
) {
5699 list_del(&rule
->list
);
5701 nf_tables_rule_destroy(&ctx
, rule
);
5704 list_for_each_entry_safe(set
, ns
, &table
->sets
, list
) {
5705 list_del(&set
->list
);
5707 nft_set_destroy(set
);
5709 list_for_each_entry_safe(obj
, ne
, &table
->objects
, list
) {
5710 list_del(&obj
->list
);
5712 nft_obj_destroy(obj
);
5714 list_for_each_entry_safe(chain
, nc
, &table
->chains
, list
) {
5715 list_del(&chain
->list
);
5717 nf_tables_chain_destroy(chain
);
5719 list_del(&table
->list
);
5720 nf_tables_table_destroy(&ctx
);
5724 static struct pernet_operations nf_tables_net_ops
= {
5725 .init
= nf_tables_init_net
,
5728 static int __init
nf_tables_module_init(void)
5732 info
= kmalloc(sizeof(struct nft_expr_info
) * NFT_RULE_MAXEXPRS
,
5739 err
= nf_tables_core_module_init();
5743 err
= nfnetlink_subsys_register(&nf_tables_subsys
);
5747 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
5748 return register_pernet_subsys(&nf_tables_net_ops
);
5750 nf_tables_core_module_exit();
5757 static void __exit
nf_tables_module_exit(void)
5759 unregister_pernet_subsys(&nf_tables_net_ops
);
5760 nfnetlink_subsys_unregister(&nf_tables_subsys
);
5762 nf_tables_core_module_exit();
5766 module_init(nf_tables_module_init
);
5767 module_exit(nf_tables_module_exit
);
5769 MODULE_LICENSE("GPL");
5770 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
5771 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES
);