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/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_tables_core.h>
20 #include <net/netfilter/nf_tables.h>
21 #include <net/net_namespace.h>
24 static LIST_HEAD(nf_tables_expressions
);
25 static LIST_HEAD(nf_tables_objects
);
28 * nft_register_afinfo - register nf_tables address family info
30 * @afi: address family info to register
32 * Register the address family for use with nf_tables. Returns zero on
33 * success or a negative errno code otherwise.
35 int nft_register_afinfo(struct net
*net
, struct nft_af_info
*afi
)
37 INIT_LIST_HEAD(&afi
->tables
);
38 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
39 list_add_tail_rcu(&afi
->list
, &net
->nft
.af_info
);
40 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
43 EXPORT_SYMBOL_GPL(nft_register_afinfo
);
45 static void __nft_release_afinfo(struct net
*net
, struct nft_af_info
*afi
);
48 * nft_unregister_afinfo - unregister nf_tables address family info
50 * @afi: address family info to unregister
52 * Unregister the address family for use with nf_tables.
54 void nft_unregister_afinfo(struct net
*net
, struct nft_af_info
*afi
)
56 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
57 __nft_release_afinfo(net
, afi
);
58 list_del_rcu(&afi
->list
);
59 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
61 EXPORT_SYMBOL_GPL(nft_unregister_afinfo
);
63 static struct nft_af_info
*nft_afinfo_lookup(struct net
*net
, int family
)
65 struct nft_af_info
*afi
;
67 list_for_each_entry(afi
, &net
->nft
.af_info
, list
) {
68 if (afi
->family
== family
)
74 static struct nft_af_info
*
75 nf_tables_afinfo_lookup(struct net
*net
, int family
, bool autoload
)
77 struct nft_af_info
*afi
;
79 afi
= nft_afinfo_lookup(net
, family
);
84 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
85 request_module("nft-afinfo-%u", family
);
86 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
87 afi
= nft_afinfo_lookup(net
, family
);
89 return ERR_PTR(-EAGAIN
);
92 return ERR_PTR(-EAFNOSUPPORT
);
95 static void nft_ctx_init(struct nft_ctx
*ctx
,
97 const struct sk_buff
*skb
,
98 const struct nlmsghdr
*nlh
,
99 struct nft_af_info
*afi
,
100 struct nft_table
*table
,
101 struct nft_chain
*chain
,
102 const struct nlattr
* const *nla
)
109 ctx
->portid
= NETLINK_CB(skb
).portid
;
110 ctx
->report
= nlmsg_report(nlh
);
111 ctx
->seq
= nlh
->nlmsg_seq
;
114 static struct nft_trans
*nft_trans_alloc_gfp(const struct nft_ctx
*ctx
,
115 int msg_type
, u32 size
, gfp_t gfp
)
117 struct nft_trans
*trans
;
119 trans
= kzalloc(sizeof(struct nft_trans
) + size
, gfp
);
123 trans
->msg_type
= msg_type
;
129 static struct nft_trans
*nft_trans_alloc(const struct nft_ctx
*ctx
,
130 int msg_type
, u32 size
)
132 return nft_trans_alloc_gfp(ctx
, msg_type
, size
, GFP_KERNEL
);
135 static void nft_trans_destroy(struct nft_trans
*trans
)
137 list_del(&trans
->list
);
141 static int nf_tables_register_hooks(struct net
*net
,
142 const struct nft_table
*table
,
143 struct nft_chain
*chain
,
144 unsigned int hook_nops
)
146 if (table
->flags
& NFT_TABLE_F_DORMANT
||
147 !(chain
->flags
& NFT_BASE_CHAIN
))
150 return nf_register_net_hooks(net
, nft_base_chain(chain
)->ops
,
154 static void nf_tables_unregister_hooks(struct net
*net
,
155 const struct nft_table
*table
,
156 struct nft_chain
*chain
,
157 unsigned int hook_nops
)
159 if (table
->flags
& NFT_TABLE_F_DORMANT
||
160 !(chain
->flags
& NFT_BASE_CHAIN
))
163 nf_unregister_net_hooks(net
, nft_base_chain(chain
)->ops
, hook_nops
);
166 static int nft_trans_table_add(struct nft_ctx
*ctx
, int msg_type
)
168 struct nft_trans
*trans
;
170 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_table
));
174 if (msg_type
== NFT_MSG_NEWTABLE
)
175 nft_activate_next(ctx
->net
, ctx
->table
);
177 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
181 static int nft_deltable(struct nft_ctx
*ctx
)
185 err
= nft_trans_table_add(ctx
, NFT_MSG_DELTABLE
);
189 nft_deactivate_next(ctx
->net
, ctx
->table
);
193 static int nft_trans_chain_add(struct nft_ctx
*ctx
, int msg_type
)
195 struct nft_trans
*trans
;
197 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_chain
));
201 if (msg_type
== NFT_MSG_NEWCHAIN
)
202 nft_activate_next(ctx
->net
, ctx
->chain
);
204 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
208 static int nft_delchain(struct nft_ctx
*ctx
)
212 err
= nft_trans_chain_add(ctx
, NFT_MSG_DELCHAIN
);
217 nft_deactivate_next(ctx
->net
, ctx
->chain
);
223 nf_tables_delrule_deactivate(struct nft_ctx
*ctx
, struct nft_rule
*rule
)
225 /* You cannot delete the same rule twice */
226 if (nft_is_active_next(ctx
->net
, rule
)) {
227 nft_deactivate_next(ctx
->net
, rule
);
234 static struct nft_trans
*nft_trans_rule_add(struct nft_ctx
*ctx
, int msg_type
,
235 struct nft_rule
*rule
)
237 struct nft_trans
*trans
;
239 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_rule
));
243 nft_trans_rule(trans
) = rule
;
244 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
249 static int nft_delrule(struct nft_ctx
*ctx
, struct nft_rule
*rule
)
251 struct nft_trans
*trans
;
254 trans
= nft_trans_rule_add(ctx
, NFT_MSG_DELRULE
, rule
);
258 err
= nf_tables_delrule_deactivate(ctx
, rule
);
260 nft_trans_destroy(trans
);
267 static int nft_delrule_by_chain(struct nft_ctx
*ctx
)
269 struct nft_rule
*rule
;
272 list_for_each_entry(rule
, &ctx
->chain
->rules
, list
) {
273 err
= nft_delrule(ctx
, rule
);
280 static int nft_trans_set_add(struct nft_ctx
*ctx
, int msg_type
,
283 struct nft_trans
*trans
;
285 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_set
));
289 if (msg_type
== NFT_MSG_NEWSET
&& ctx
->nla
[NFTA_SET_ID
] != NULL
) {
290 nft_trans_set_id(trans
) =
291 ntohl(nla_get_be32(ctx
->nla
[NFTA_SET_ID
]));
292 nft_activate_next(ctx
->net
, set
);
294 nft_trans_set(trans
) = set
;
295 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
300 static int nft_delset(struct nft_ctx
*ctx
, struct nft_set
*set
)
304 err
= nft_trans_set_add(ctx
, NFT_MSG_DELSET
, set
);
308 nft_deactivate_next(ctx
->net
, set
);
314 static int nft_trans_obj_add(struct nft_ctx
*ctx
, int msg_type
,
315 struct nft_object
*obj
)
317 struct nft_trans
*trans
;
319 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_obj
));
323 if (msg_type
== NFT_MSG_NEWOBJ
)
324 nft_activate_next(ctx
->net
, obj
);
326 nft_trans_obj(trans
) = obj
;
327 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
332 static int nft_delobj(struct nft_ctx
*ctx
, struct nft_object
*obj
)
336 err
= nft_trans_obj_add(ctx
, NFT_MSG_DELOBJ
, obj
);
340 nft_deactivate_next(ctx
->net
, obj
);
350 static struct nft_table
*nft_table_lookup(const struct nft_af_info
*afi
,
351 const struct nlattr
*nla
,
354 struct nft_table
*table
;
356 list_for_each_entry(table
, &afi
->tables
, list
) {
357 if (!nla_strcmp(nla
, table
->name
) &&
358 nft_active_genmask(table
, genmask
))
364 static struct nft_table
*nf_tables_table_lookup(const struct nft_af_info
*afi
,
365 const struct nlattr
*nla
,
368 struct nft_table
*table
;
371 return ERR_PTR(-EINVAL
);
373 table
= nft_table_lookup(afi
, nla
, genmask
);
377 return ERR_PTR(-ENOENT
);
380 static inline u64
nf_tables_alloc_handle(struct nft_table
*table
)
382 return ++table
->hgenerator
;
385 static const struct nf_chain_type
*chain_type
[AF_MAX
][NFT_CHAIN_T_MAX
];
387 static const struct nf_chain_type
*
388 __nf_tables_chain_type_lookup(int family
, const struct nlattr
*nla
)
392 for (i
= 0; i
< NFT_CHAIN_T_MAX
; i
++) {
393 if (chain_type
[family
][i
] != NULL
&&
394 !nla_strcmp(nla
, chain_type
[family
][i
]->name
))
395 return chain_type
[family
][i
];
400 static const struct nf_chain_type
*
401 nf_tables_chain_type_lookup(const struct nft_af_info
*afi
,
402 const struct nlattr
*nla
,
405 const struct nf_chain_type
*type
;
407 type
= __nf_tables_chain_type_lookup(afi
->family
, nla
);
410 #ifdef CONFIG_MODULES
412 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
413 request_module("nft-chain-%u-%.*s", afi
->family
,
414 nla_len(nla
), (const char *)nla_data(nla
));
415 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
416 type
= __nf_tables_chain_type_lookup(afi
->family
, nla
);
418 return ERR_PTR(-EAGAIN
);
421 return ERR_PTR(-ENOENT
);
424 static const struct nla_policy nft_table_policy
[NFTA_TABLE_MAX
+ 1] = {
425 [NFTA_TABLE_NAME
] = { .type
= NLA_STRING
,
426 .len
= NFT_TABLE_MAXNAMELEN
- 1 },
427 [NFTA_TABLE_FLAGS
] = { .type
= NLA_U32
},
430 static int nf_tables_fill_table_info(struct sk_buff
*skb
, struct net
*net
,
431 u32 portid
, u32 seq
, int event
, u32 flags
,
432 int family
, const struct nft_table
*table
)
434 struct nlmsghdr
*nlh
;
435 struct nfgenmsg
*nfmsg
;
437 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
438 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
), flags
);
440 goto nla_put_failure
;
442 nfmsg
= nlmsg_data(nlh
);
443 nfmsg
->nfgen_family
= family
;
444 nfmsg
->version
= NFNETLINK_V0
;
445 nfmsg
->res_id
= htons(net
->nft
.base_seq
& 0xffff);
447 if (nla_put_string(skb
, NFTA_TABLE_NAME
, table
->name
) ||
448 nla_put_be32(skb
, NFTA_TABLE_FLAGS
, htonl(table
->flags
)) ||
449 nla_put_be32(skb
, NFTA_TABLE_USE
, htonl(table
->use
)))
450 goto nla_put_failure
;
456 nlmsg_trim(skb
, nlh
);
460 static int nf_tables_table_notify(const struct nft_ctx
*ctx
, int event
)
466 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
470 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
474 err
= nf_tables_fill_table_info(skb
, ctx
->net
, ctx
->portid
, ctx
->seq
,
475 event
, 0, ctx
->afi
->family
, ctx
->table
);
481 err
= nfnetlink_send(skb
, ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
482 ctx
->report
, GFP_KERNEL
);
485 nfnetlink_set_err(ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
491 static int nf_tables_dump_tables(struct sk_buff
*skb
,
492 struct netlink_callback
*cb
)
494 const struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
495 const struct nft_af_info
*afi
;
496 const struct nft_table
*table
;
497 unsigned int idx
= 0, s_idx
= cb
->args
[0];
498 struct net
*net
= sock_net(skb
->sk
);
499 int family
= nfmsg
->nfgen_family
;
502 cb
->seq
= net
->nft
.base_seq
;
504 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
505 if (family
!= NFPROTO_UNSPEC
&& family
!= afi
->family
)
508 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
512 memset(&cb
->args
[1], 0,
513 sizeof(cb
->args
) - sizeof(cb
->args
[0]));
514 if (!nft_is_active(net
, table
))
516 if (nf_tables_fill_table_info(skb
, net
,
517 NETLINK_CB(cb
->skb
).portid
,
521 afi
->family
, table
) < 0)
524 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
535 static int nf_tables_gettable(struct net
*net
, struct sock
*nlsk
,
536 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
537 const struct nlattr
* const nla
[])
539 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
540 u8 genmask
= nft_genmask_cur(net
);
541 const struct nft_af_info
*afi
;
542 const struct nft_table
*table
;
543 struct sk_buff
*skb2
;
544 int family
= nfmsg
->nfgen_family
;
547 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
548 struct netlink_dump_control c
= {
549 .dump
= nf_tables_dump_tables
,
551 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
554 afi
= nf_tables_afinfo_lookup(net
, family
, false);
558 table
= nf_tables_table_lookup(afi
, nla
[NFTA_TABLE_NAME
], genmask
);
560 return PTR_ERR(table
);
562 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
566 err
= nf_tables_fill_table_info(skb2
, net
, NETLINK_CB(skb
).portid
,
567 nlh
->nlmsg_seq
, NFT_MSG_NEWTABLE
, 0,
572 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
579 static int nf_tables_table_enable(struct net
*net
,
580 const struct nft_af_info
*afi
,
581 struct nft_table
*table
)
583 struct nft_chain
*chain
;
586 list_for_each_entry(chain
, &table
->chains
, list
) {
587 if (!nft_is_active_next(net
, chain
))
589 if (!(chain
->flags
& NFT_BASE_CHAIN
))
592 err
= nf_register_net_hooks(net
, nft_base_chain(chain
)->ops
,
601 list_for_each_entry(chain
, &table
->chains
, list
) {
602 if (!nft_is_active_next(net
, chain
))
604 if (!(chain
->flags
& NFT_BASE_CHAIN
))
610 nf_unregister_net_hooks(net
, nft_base_chain(chain
)->ops
,
616 static void nf_tables_table_disable(struct net
*net
,
617 const struct nft_af_info
*afi
,
618 struct nft_table
*table
)
620 struct nft_chain
*chain
;
622 list_for_each_entry(chain
, &table
->chains
, list
) {
623 if (!nft_is_active_next(net
, chain
))
625 if (!(chain
->flags
& NFT_BASE_CHAIN
))
628 nf_unregister_net_hooks(net
, nft_base_chain(chain
)->ops
,
633 static int nf_tables_updtable(struct nft_ctx
*ctx
)
635 struct nft_trans
*trans
;
639 if (!ctx
->nla
[NFTA_TABLE_FLAGS
])
642 flags
= ntohl(nla_get_be32(ctx
->nla
[NFTA_TABLE_FLAGS
]));
643 if (flags
& ~NFT_TABLE_F_DORMANT
)
646 if (flags
== ctx
->table
->flags
)
649 trans
= nft_trans_alloc(ctx
, NFT_MSG_NEWTABLE
,
650 sizeof(struct nft_trans_table
));
654 if ((flags
& NFT_TABLE_F_DORMANT
) &&
655 !(ctx
->table
->flags
& NFT_TABLE_F_DORMANT
)) {
656 nft_trans_table_enable(trans
) = false;
657 } else if (!(flags
& NFT_TABLE_F_DORMANT
) &&
658 ctx
->table
->flags
& NFT_TABLE_F_DORMANT
) {
659 ret
= nf_tables_table_enable(ctx
->net
, ctx
->afi
, ctx
->table
);
661 ctx
->table
->flags
&= ~NFT_TABLE_F_DORMANT
;
662 nft_trans_table_enable(trans
) = true;
668 nft_trans_table_update(trans
) = true;
669 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
672 nft_trans_destroy(trans
);
676 static int nf_tables_newtable(struct net
*net
, struct sock
*nlsk
,
677 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
678 const struct nlattr
* const nla
[])
680 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
681 u8 genmask
= nft_genmask_next(net
);
682 const struct nlattr
*name
;
683 struct nft_af_info
*afi
;
684 struct nft_table
*table
;
685 int family
= nfmsg
->nfgen_family
;
690 afi
= nf_tables_afinfo_lookup(net
, family
, true);
694 name
= nla
[NFTA_TABLE_NAME
];
695 table
= nf_tables_table_lookup(afi
, name
, genmask
);
697 if (PTR_ERR(table
) != -ENOENT
)
698 return PTR_ERR(table
);
703 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
705 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
708 nft_ctx_init(&ctx
, net
, skb
, nlh
, afi
, table
, NULL
, nla
);
709 return nf_tables_updtable(&ctx
);
712 if (nla
[NFTA_TABLE_FLAGS
]) {
713 flags
= ntohl(nla_get_be32(nla
[NFTA_TABLE_FLAGS
]));
714 if (flags
& ~NFT_TABLE_F_DORMANT
)
719 if (!try_module_get(afi
->owner
))
723 table
= kzalloc(sizeof(*table
), GFP_KERNEL
);
727 nla_strlcpy(table
->name
, name
, NFT_TABLE_MAXNAMELEN
);
728 INIT_LIST_HEAD(&table
->chains
);
729 INIT_LIST_HEAD(&table
->sets
);
730 INIT_LIST_HEAD(&table
->objects
);
731 table
->flags
= flags
;
733 nft_ctx_init(&ctx
, net
, skb
, nlh
, afi
, table
, NULL
, nla
);
734 err
= nft_trans_table_add(&ctx
, NFT_MSG_NEWTABLE
);
738 list_add_tail_rcu(&table
->list
, &afi
->tables
);
743 module_put(afi
->owner
);
748 static int nft_flush_table(struct nft_ctx
*ctx
)
751 struct nft_chain
*chain
, *nc
;
752 struct nft_object
*obj
, *ne
;
753 struct nft_set
*set
, *ns
;
755 list_for_each_entry(chain
, &ctx
->table
->chains
, list
) {
756 if (!nft_is_active_next(ctx
->net
, chain
))
761 err
= nft_delrule_by_chain(ctx
);
766 list_for_each_entry_safe(set
, ns
, &ctx
->table
->sets
, list
) {
767 if (!nft_is_active_next(ctx
->net
, set
))
770 if (set
->flags
& NFT_SET_ANONYMOUS
&&
771 !list_empty(&set
->bindings
))
774 err
= nft_delset(ctx
, set
);
779 list_for_each_entry_safe(obj
, ne
, &ctx
->table
->objects
, list
) {
780 err
= nft_delobj(ctx
, obj
);
785 list_for_each_entry_safe(chain
, nc
, &ctx
->table
->chains
, list
) {
786 if (!nft_is_active_next(ctx
->net
, chain
))
791 err
= nft_delchain(ctx
);
796 err
= nft_deltable(ctx
);
801 static int nft_flush(struct nft_ctx
*ctx
, int family
)
803 struct nft_af_info
*afi
;
804 struct nft_table
*table
, *nt
;
805 const struct nlattr
* const *nla
= ctx
->nla
;
808 list_for_each_entry(afi
, &ctx
->net
->nft
.af_info
, list
) {
809 if (family
!= AF_UNSPEC
&& afi
->family
!= family
)
813 list_for_each_entry_safe(table
, nt
, &afi
->tables
, list
) {
814 if (!nft_is_active_next(ctx
->net
, table
))
817 if (nla
[NFTA_TABLE_NAME
] &&
818 nla_strcmp(nla
[NFTA_TABLE_NAME
], table
->name
) != 0)
823 err
= nft_flush_table(ctx
);
832 static int nf_tables_deltable(struct net
*net
, struct sock
*nlsk
,
833 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
834 const struct nlattr
* const nla
[])
836 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
837 u8 genmask
= nft_genmask_next(net
);
838 struct nft_af_info
*afi
;
839 struct nft_table
*table
;
840 int family
= nfmsg
->nfgen_family
;
843 nft_ctx_init(&ctx
, net
, skb
, nlh
, NULL
, NULL
, NULL
, nla
);
844 if (family
== AF_UNSPEC
|| nla
[NFTA_TABLE_NAME
] == NULL
)
845 return nft_flush(&ctx
, family
);
847 afi
= nf_tables_afinfo_lookup(net
, family
, false);
851 table
= nf_tables_table_lookup(afi
, nla
[NFTA_TABLE_NAME
], genmask
);
853 return PTR_ERR(table
);
858 return nft_flush_table(&ctx
);
861 static void nf_tables_table_destroy(struct nft_ctx
*ctx
)
863 BUG_ON(ctx
->table
->use
> 0);
866 module_put(ctx
->afi
->owner
);
869 int nft_register_chain_type(const struct nf_chain_type
*ctype
)
873 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
874 if (chain_type
[ctype
->family
][ctype
->type
] != NULL
) {
878 chain_type
[ctype
->family
][ctype
->type
] = ctype
;
880 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
883 EXPORT_SYMBOL_GPL(nft_register_chain_type
);
885 void nft_unregister_chain_type(const struct nf_chain_type
*ctype
)
887 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
888 chain_type
[ctype
->family
][ctype
->type
] = NULL
;
889 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
891 EXPORT_SYMBOL_GPL(nft_unregister_chain_type
);
897 static struct nft_chain
*
898 nf_tables_chain_lookup_byhandle(const struct nft_table
*table
, u64 handle
,
901 struct nft_chain
*chain
;
903 list_for_each_entry(chain
, &table
->chains
, list
) {
904 if (chain
->handle
== handle
&&
905 nft_active_genmask(chain
, genmask
))
909 return ERR_PTR(-ENOENT
);
912 static struct nft_chain
*nf_tables_chain_lookup(const struct nft_table
*table
,
913 const struct nlattr
*nla
,
916 struct nft_chain
*chain
;
919 return ERR_PTR(-EINVAL
);
921 list_for_each_entry(chain
, &table
->chains
, list
) {
922 if (!nla_strcmp(nla
, chain
->name
) &&
923 nft_active_genmask(chain
, genmask
))
927 return ERR_PTR(-ENOENT
);
930 static const struct nla_policy nft_chain_policy
[NFTA_CHAIN_MAX
+ 1] = {
931 [NFTA_CHAIN_TABLE
] = { .type
= NLA_STRING
},
932 [NFTA_CHAIN_HANDLE
] = { .type
= NLA_U64
},
933 [NFTA_CHAIN_NAME
] = { .type
= NLA_STRING
,
934 .len
= NFT_CHAIN_MAXNAMELEN
- 1 },
935 [NFTA_CHAIN_HOOK
] = { .type
= NLA_NESTED
},
936 [NFTA_CHAIN_POLICY
] = { .type
= NLA_U32
},
937 [NFTA_CHAIN_TYPE
] = { .type
= NLA_STRING
},
938 [NFTA_CHAIN_COUNTERS
] = { .type
= NLA_NESTED
},
941 static const struct nla_policy nft_hook_policy
[NFTA_HOOK_MAX
+ 1] = {
942 [NFTA_HOOK_HOOKNUM
] = { .type
= NLA_U32
},
943 [NFTA_HOOK_PRIORITY
] = { .type
= NLA_U32
},
944 [NFTA_HOOK_DEV
] = { .type
= NLA_STRING
,
945 .len
= IFNAMSIZ
- 1 },
948 static int nft_dump_stats(struct sk_buff
*skb
, struct nft_stats __percpu
*stats
)
950 struct nft_stats
*cpu_stats
, total
;
956 memset(&total
, 0, sizeof(total
));
957 for_each_possible_cpu(cpu
) {
958 cpu_stats
= per_cpu_ptr(stats
, cpu
);
960 seq
= u64_stats_fetch_begin_irq(&cpu_stats
->syncp
);
961 pkts
= cpu_stats
->pkts
;
962 bytes
= cpu_stats
->bytes
;
963 } while (u64_stats_fetch_retry_irq(&cpu_stats
->syncp
, seq
));
965 total
.bytes
+= bytes
;
967 nest
= nla_nest_start(skb
, NFTA_CHAIN_COUNTERS
);
969 goto nla_put_failure
;
971 if (nla_put_be64(skb
, NFTA_COUNTER_PACKETS
, cpu_to_be64(total
.pkts
),
973 nla_put_be64(skb
, NFTA_COUNTER_BYTES
, cpu_to_be64(total
.bytes
),
975 goto nla_put_failure
;
977 nla_nest_end(skb
, nest
);
984 static int nf_tables_fill_chain_info(struct sk_buff
*skb
, struct net
*net
,
985 u32 portid
, u32 seq
, int event
, u32 flags
,
986 int family
, const struct nft_table
*table
,
987 const struct nft_chain
*chain
)
989 struct nlmsghdr
*nlh
;
990 struct nfgenmsg
*nfmsg
;
992 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
993 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
), flags
);
995 goto nla_put_failure
;
997 nfmsg
= nlmsg_data(nlh
);
998 nfmsg
->nfgen_family
= family
;
999 nfmsg
->version
= NFNETLINK_V0
;
1000 nfmsg
->res_id
= htons(net
->nft
.base_seq
& 0xffff);
1002 if (nla_put_string(skb
, NFTA_CHAIN_TABLE
, table
->name
))
1003 goto nla_put_failure
;
1004 if (nla_put_be64(skb
, NFTA_CHAIN_HANDLE
, cpu_to_be64(chain
->handle
),
1006 goto nla_put_failure
;
1007 if (nla_put_string(skb
, NFTA_CHAIN_NAME
, chain
->name
))
1008 goto nla_put_failure
;
1010 if (chain
->flags
& NFT_BASE_CHAIN
) {
1011 const struct nft_base_chain
*basechain
= nft_base_chain(chain
);
1012 const struct nf_hook_ops
*ops
= &basechain
->ops
[0];
1013 struct nlattr
*nest
;
1015 nest
= nla_nest_start(skb
, NFTA_CHAIN_HOOK
);
1017 goto nla_put_failure
;
1018 if (nla_put_be32(skb
, NFTA_HOOK_HOOKNUM
, htonl(ops
->hooknum
)))
1019 goto nla_put_failure
;
1020 if (nla_put_be32(skb
, NFTA_HOOK_PRIORITY
, htonl(ops
->priority
)))
1021 goto nla_put_failure
;
1022 if (basechain
->dev_name
[0] &&
1023 nla_put_string(skb
, NFTA_HOOK_DEV
, basechain
->dev_name
))
1024 goto nla_put_failure
;
1025 nla_nest_end(skb
, nest
);
1027 if (nla_put_be32(skb
, NFTA_CHAIN_POLICY
,
1028 htonl(basechain
->policy
)))
1029 goto nla_put_failure
;
1031 if (nla_put_string(skb
, NFTA_CHAIN_TYPE
, basechain
->type
->name
))
1032 goto nla_put_failure
;
1034 if (nft_dump_stats(skb
, nft_base_chain(chain
)->stats
))
1035 goto nla_put_failure
;
1038 if (nla_put_be32(skb
, NFTA_CHAIN_USE
, htonl(chain
->use
)))
1039 goto nla_put_failure
;
1041 nlmsg_end(skb
, nlh
);
1045 nlmsg_trim(skb
, nlh
);
1049 static int nf_tables_chain_notify(const struct nft_ctx
*ctx
, int event
)
1051 struct sk_buff
*skb
;
1055 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
1059 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
1063 err
= nf_tables_fill_chain_info(skb
, ctx
->net
, ctx
->portid
, ctx
->seq
,
1064 event
, 0, ctx
->afi
->family
, ctx
->table
,
1071 err
= nfnetlink_send(skb
, ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
1072 ctx
->report
, GFP_KERNEL
);
1075 nfnetlink_set_err(ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
1081 static int nf_tables_dump_chains(struct sk_buff
*skb
,
1082 struct netlink_callback
*cb
)
1084 const struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
1085 const struct nft_af_info
*afi
;
1086 const struct nft_table
*table
;
1087 const struct nft_chain
*chain
;
1088 unsigned int idx
= 0, s_idx
= cb
->args
[0];
1089 struct net
*net
= sock_net(skb
->sk
);
1090 int family
= nfmsg
->nfgen_family
;
1093 cb
->seq
= net
->nft
.base_seq
;
1095 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
1096 if (family
!= NFPROTO_UNSPEC
&& family
!= afi
->family
)
1099 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
1100 list_for_each_entry_rcu(chain
, &table
->chains
, list
) {
1104 memset(&cb
->args
[1], 0,
1105 sizeof(cb
->args
) - sizeof(cb
->args
[0]));
1106 if (!nft_is_active(net
, chain
))
1108 if (nf_tables_fill_chain_info(skb
, net
,
1109 NETLINK_CB(cb
->skb
).portid
,
1113 afi
->family
, table
, chain
) < 0)
1116 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
1128 static int nf_tables_getchain(struct net
*net
, struct sock
*nlsk
,
1129 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
1130 const struct nlattr
* const nla
[])
1132 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1133 u8 genmask
= nft_genmask_cur(net
);
1134 const struct nft_af_info
*afi
;
1135 const struct nft_table
*table
;
1136 const struct nft_chain
*chain
;
1137 struct sk_buff
*skb2
;
1138 int family
= nfmsg
->nfgen_family
;
1141 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1142 struct netlink_dump_control c
= {
1143 .dump
= nf_tables_dump_chains
,
1145 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
1148 afi
= nf_tables_afinfo_lookup(net
, family
, false);
1150 return PTR_ERR(afi
);
1152 table
= nf_tables_table_lookup(afi
, nla
[NFTA_CHAIN_TABLE
], genmask
);
1154 return PTR_ERR(table
);
1156 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_CHAIN_NAME
], genmask
);
1158 return PTR_ERR(chain
);
1160 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1164 err
= nf_tables_fill_chain_info(skb2
, net
, NETLINK_CB(skb
).portid
,
1165 nlh
->nlmsg_seq
, NFT_MSG_NEWCHAIN
, 0,
1166 family
, table
, chain
);
1170 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
1177 static const struct nla_policy nft_counter_policy
[NFTA_COUNTER_MAX
+ 1] = {
1178 [NFTA_COUNTER_PACKETS
] = { .type
= NLA_U64
},
1179 [NFTA_COUNTER_BYTES
] = { .type
= NLA_U64
},
1182 static struct nft_stats __percpu
*nft_stats_alloc(const struct nlattr
*attr
)
1184 struct nlattr
*tb
[NFTA_COUNTER_MAX
+1];
1185 struct nft_stats __percpu
*newstats
;
1186 struct nft_stats
*stats
;
1189 err
= nla_parse_nested(tb
, NFTA_COUNTER_MAX
, attr
, nft_counter_policy
);
1191 return ERR_PTR(err
);
1193 if (!tb
[NFTA_COUNTER_BYTES
] || !tb
[NFTA_COUNTER_PACKETS
])
1194 return ERR_PTR(-EINVAL
);
1196 newstats
= netdev_alloc_pcpu_stats(struct nft_stats
);
1197 if (newstats
== NULL
)
1198 return ERR_PTR(-ENOMEM
);
1200 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1201 * are not exposed to userspace.
1204 stats
= this_cpu_ptr(newstats
);
1205 stats
->bytes
= be64_to_cpu(nla_get_be64(tb
[NFTA_COUNTER_BYTES
]));
1206 stats
->pkts
= be64_to_cpu(nla_get_be64(tb
[NFTA_COUNTER_PACKETS
]));
1212 static void nft_chain_stats_replace(struct nft_base_chain
*chain
,
1213 struct nft_stats __percpu
*newstats
)
1215 if (newstats
== NULL
)
1219 struct nft_stats __percpu
*oldstats
=
1220 nft_dereference(chain
->stats
);
1222 rcu_assign_pointer(chain
->stats
, newstats
);
1224 free_percpu(oldstats
);
1226 rcu_assign_pointer(chain
->stats
, newstats
);
1229 static void nf_tables_chain_destroy(struct nft_chain
*chain
)
1231 BUG_ON(chain
->use
> 0);
1233 if (chain
->flags
& NFT_BASE_CHAIN
) {
1234 struct nft_base_chain
*basechain
= nft_base_chain(chain
);
1236 module_put(basechain
->type
->owner
);
1237 free_percpu(basechain
->stats
);
1238 if (basechain
->ops
[0].dev
!= NULL
)
1239 dev_put(basechain
->ops
[0].dev
);
1246 struct nft_chain_hook
{
1249 const struct nf_chain_type
*type
;
1250 struct net_device
*dev
;
1253 static int nft_chain_parse_hook(struct net
*net
,
1254 const struct nlattr
* const nla
[],
1255 struct nft_af_info
*afi
,
1256 struct nft_chain_hook
*hook
, bool create
)
1258 struct nlattr
*ha
[NFTA_HOOK_MAX
+ 1];
1259 const struct nf_chain_type
*type
;
1260 struct net_device
*dev
;
1263 err
= nla_parse_nested(ha
, NFTA_HOOK_MAX
, nla
[NFTA_CHAIN_HOOK
],
1268 if (ha
[NFTA_HOOK_HOOKNUM
] == NULL
||
1269 ha
[NFTA_HOOK_PRIORITY
] == NULL
)
1272 hook
->num
= ntohl(nla_get_be32(ha
[NFTA_HOOK_HOOKNUM
]));
1273 if (hook
->num
>= afi
->nhooks
)
1276 hook
->priority
= ntohl(nla_get_be32(ha
[NFTA_HOOK_PRIORITY
]));
1278 type
= chain_type
[afi
->family
][NFT_CHAIN_T_DEFAULT
];
1279 if (nla
[NFTA_CHAIN_TYPE
]) {
1280 type
= nf_tables_chain_type_lookup(afi
, nla
[NFTA_CHAIN_TYPE
],
1283 return PTR_ERR(type
);
1285 if (!(type
->hook_mask
& (1 << hook
->num
)))
1287 if (!try_module_get(type
->owner
))
1293 if (afi
->flags
& NFT_AF_NEEDS_DEV
) {
1294 char ifname
[IFNAMSIZ
];
1296 if (!ha
[NFTA_HOOK_DEV
]) {
1297 module_put(type
->owner
);
1301 nla_strlcpy(ifname
, ha
[NFTA_HOOK_DEV
], IFNAMSIZ
);
1302 dev
= dev_get_by_name(net
, ifname
);
1304 module_put(type
->owner
);
1308 } else if (ha
[NFTA_HOOK_DEV
]) {
1309 module_put(type
->owner
);
1316 static void nft_chain_release_hook(struct nft_chain_hook
*hook
)
1318 module_put(hook
->type
->owner
);
1319 if (hook
->dev
!= NULL
)
1323 static int nf_tables_newchain(struct net
*net
, struct sock
*nlsk
,
1324 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
1325 const struct nlattr
* const nla
[])
1327 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1328 const struct nlattr
* uninitialized_var(name
);
1329 struct nft_af_info
*afi
;
1330 struct nft_table
*table
;
1331 struct nft_chain
*chain
;
1332 struct nft_base_chain
*basechain
= NULL
;
1333 u8 genmask
= nft_genmask_next(net
);
1334 int family
= nfmsg
->nfgen_family
;
1335 u8 policy
= NF_ACCEPT
;
1338 struct nft_stats __percpu
*stats
;
1343 create
= nlh
->nlmsg_flags
& NLM_F_CREATE
? true : false;
1345 afi
= nf_tables_afinfo_lookup(net
, family
, true);
1347 return PTR_ERR(afi
);
1349 table
= nf_tables_table_lookup(afi
, nla
[NFTA_CHAIN_TABLE
], genmask
);
1351 return PTR_ERR(table
);
1354 name
= nla
[NFTA_CHAIN_NAME
];
1356 if (nla
[NFTA_CHAIN_HANDLE
]) {
1357 handle
= be64_to_cpu(nla_get_be64(nla
[NFTA_CHAIN_HANDLE
]));
1358 chain
= nf_tables_chain_lookup_byhandle(table
, handle
, genmask
);
1360 return PTR_ERR(chain
);
1362 chain
= nf_tables_chain_lookup(table
, name
, genmask
);
1363 if (IS_ERR(chain
)) {
1364 if (PTR_ERR(chain
) != -ENOENT
)
1365 return PTR_ERR(chain
);
1370 if (nla
[NFTA_CHAIN_POLICY
]) {
1371 if ((chain
!= NULL
&&
1372 !(chain
->flags
& NFT_BASE_CHAIN
)))
1375 if (chain
== NULL
&&
1376 nla
[NFTA_CHAIN_HOOK
] == NULL
)
1379 policy
= ntohl(nla_get_be32(nla
[NFTA_CHAIN_POLICY
]));
1389 if (chain
!= NULL
) {
1390 struct nft_stats
*stats
= NULL
;
1391 struct nft_trans
*trans
;
1393 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
1395 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
1398 if (nla
[NFTA_CHAIN_HOOK
]) {
1399 struct nft_base_chain
*basechain
;
1400 struct nft_chain_hook hook
;
1401 struct nf_hook_ops
*ops
;
1403 if (!(chain
->flags
& NFT_BASE_CHAIN
))
1406 err
= nft_chain_parse_hook(net
, nla
, afi
, &hook
,
1411 basechain
= nft_base_chain(chain
);
1412 if (basechain
->type
!= hook
.type
) {
1413 nft_chain_release_hook(&hook
);
1417 for (i
= 0; i
< afi
->nops
; i
++) {
1418 ops
= &basechain
->ops
[i
];
1419 if (ops
->hooknum
!= hook
.num
||
1420 ops
->priority
!= hook
.priority
||
1421 ops
->dev
!= hook
.dev
) {
1422 nft_chain_release_hook(&hook
);
1426 nft_chain_release_hook(&hook
);
1429 if (nla
[NFTA_CHAIN_HANDLE
] && name
) {
1430 struct nft_chain
*chain2
;
1432 chain2
= nf_tables_chain_lookup(table
,
1433 nla
[NFTA_CHAIN_NAME
],
1436 return PTR_ERR(chain2
);
1439 if (nla
[NFTA_CHAIN_COUNTERS
]) {
1440 if (!(chain
->flags
& NFT_BASE_CHAIN
))
1443 stats
= nft_stats_alloc(nla
[NFTA_CHAIN_COUNTERS
]);
1445 return PTR_ERR(stats
);
1448 nft_ctx_init(&ctx
, net
, skb
, nlh
, afi
, table
, chain
, nla
);
1449 trans
= nft_trans_alloc(&ctx
, NFT_MSG_NEWCHAIN
,
1450 sizeof(struct nft_trans_chain
));
1451 if (trans
== NULL
) {
1456 nft_trans_chain_stats(trans
) = stats
;
1457 nft_trans_chain_update(trans
) = true;
1459 if (nla
[NFTA_CHAIN_POLICY
])
1460 nft_trans_chain_policy(trans
) = policy
;
1462 nft_trans_chain_policy(trans
) = -1;
1464 if (nla
[NFTA_CHAIN_HANDLE
] && name
) {
1465 nla_strlcpy(nft_trans_chain_name(trans
), name
,
1466 NFT_CHAIN_MAXNAMELEN
);
1468 list_add_tail(&trans
->list
, &net
->nft
.commit_list
);
1472 if (table
->use
== UINT_MAX
)
1475 if (nla
[NFTA_CHAIN_HOOK
]) {
1476 struct nft_chain_hook hook
;
1477 struct nf_hook_ops
*ops
;
1480 err
= nft_chain_parse_hook(net
, nla
, afi
, &hook
, create
);
1484 basechain
= kzalloc(sizeof(*basechain
), GFP_KERNEL
);
1485 if (basechain
== NULL
) {
1486 nft_chain_release_hook(&hook
);
1490 if (hook
.dev
!= NULL
)
1491 strncpy(basechain
->dev_name
, hook
.dev
->name
, IFNAMSIZ
);
1493 if (nla
[NFTA_CHAIN_COUNTERS
]) {
1494 stats
= nft_stats_alloc(nla
[NFTA_CHAIN_COUNTERS
]);
1495 if (IS_ERR(stats
)) {
1496 nft_chain_release_hook(&hook
);
1498 return PTR_ERR(stats
);
1500 basechain
->stats
= stats
;
1502 stats
= netdev_alloc_pcpu_stats(struct nft_stats
);
1503 if (stats
== NULL
) {
1504 nft_chain_release_hook(&hook
);
1508 rcu_assign_pointer(basechain
->stats
, stats
);
1511 hookfn
= hook
.type
->hooks
[hook
.num
];
1512 basechain
->type
= hook
.type
;
1513 chain
= &basechain
->chain
;
1515 for (i
= 0; i
< afi
->nops
; i
++) {
1516 ops
= &basechain
->ops
[i
];
1518 ops
->hooknum
= hook
.num
;
1519 ops
->priority
= hook
.priority
;
1521 ops
->hook
= afi
->hooks
[ops
->hooknum
];
1522 ops
->dev
= hook
.dev
;
1525 if (afi
->hook_ops_init
)
1526 afi
->hook_ops_init(ops
, i
);
1529 chain
->flags
|= NFT_BASE_CHAIN
;
1530 basechain
->policy
= policy
;
1532 chain
= kzalloc(sizeof(*chain
), GFP_KERNEL
);
1537 INIT_LIST_HEAD(&chain
->rules
);
1538 chain
->handle
= nf_tables_alloc_handle(table
);
1539 chain
->table
= table
;
1540 nla_strlcpy(chain
->name
, name
, NFT_CHAIN_MAXNAMELEN
);
1542 err
= nf_tables_register_hooks(net
, table
, chain
, afi
->nops
);
1546 nft_ctx_init(&ctx
, net
, skb
, nlh
, afi
, table
, chain
, nla
);
1547 err
= nft_trans_chain_add(&ctx
, NFT_MSG_NEWCHAIN
);
1552 list_add_tail_rcu(&chain
->list
, &table
->chains
);
1555 nf_tables_unregister_hooks(net
, table
, chain
, afi
->nops
);
1557 nf_tables_chain_destroy(chain
);
1561 static int nf_tables_delchain(struct net
*net
, struct sock
*nlsk
,
1562 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
1563 const struct nlattr
* const nla
[])
1565 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1566 u8 genmask
= nft_genmask_next(net
);
1567 struct nft_af_info
*afi
;
1568 struct nft_table
*table
;
1569 struct nft_chain
*chain
;
1570 int family
= nfmsg
->nfgen_family
;
1573 afi
= nf_tables_afinfo_lookup(net
, family
, false);
1575 return PTR_ERR(afi
);
1577 table
= nf_tables_table_lookup(afi
, nla
[NFTA_CHAIN_TABLE
], genmask
);
1579 return PTR_ERR(table
);
1581 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_CHAIN_NAME
], genmask
);
1583 return PTR_ERR(chain
);
1587 nft_ctx_init(&ctx
, net
, skb
, nlh
, afi
, table
, chain
, nla
);
1589 return nft_delchain(&ctx
);
1597 * nft_register_expr - register nf_tables expr type
1600 * Registers the expr type for use with nf_tables. Returns zero on
1601 * success or a negative errno code otherwise.
1603 int nft_register_expr(struct nft_expr_type
*type
)
1605 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1606 if (type
->family
== NFPROTO_UNSPEC
)
1607 list_add_tail_rcu(&type
->list
, &nf_tables_expressions
);
1609 list_add_rcu(&type
->list
, &nf_tables_expressions
);
1610 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1613 EXPORT_SYMBOL_GPL(nft_register_expr
);
1616 * nft_unregister_expr - unregister nf_tables expr type
1619 * Unregisters the expr typefor use with nf_tables.
1621 void nft_unregister_expr(struct nft_expr_type
*type
)
1623 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1624 list_del_rcu(&type
->list
);
1625 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1627 EXPORT_SYMBOL_GPL(nft_unregister_expr
);
1629 static const struct nft_expr_type
*__nft_expr_type_get(u8 family
,
1632 const struct nft_expr_type
*type
;
1634 list_for_each_entry(type
, &nf_tables_expressions
, list
) {
1635 if (!nla_strcmp(nla
, type
->name
) &&
1636 (!type
->family
|| type
->family
== family
))
1642 static const struct nft_expr_type
*nft_expr_type_get(u8 family
,
1645 const struct nft_expr_type
*type
;
1648 return ERR_PTR(-EINVAL
);
1650 type
= __nft_expr_type_get(family
, nla
);
1651 if (type
!= NULL
&& try_module_get(type
->owner
))
1654 #ifdef CONFIG_MODULES
1656 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1657 request_module("nft-expr-%u-%.*s", family
,
1658 nla_len(nla
), (char *)nla_data(nla
));
1659 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1660 if (__nft_expr_type_get(family
, nla
))
1661 return ERR_PTR(-EAGAIN
);
1663 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1664 request_module("nft-expr-%.*s",
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
);
1671 return ERR_PTR(-ENOENT
);
1674 static const struct nla_policy nft_expr_policy
[NFTA_EXPR_MAX
+ 1] = {
1675 [NFTA_EXPR_NAME
] = { .type
= NLA_STRING
},
1676 [NFTA_EXPR_DATA
] = { .type
= NLA_NESTED
},
1679 static int nf_tables_fill_expr_info(struct sk_buff
*skb
,
1680 const struct nft_expr
*expr
)
1682 if (nla_put_string(skb
, NFTA_EXPR_NAME
, expr
->ops
->type
->name
))
1683 goto nla_put_failure
;
1685 if (expr
->ops
->dump
) {
1686 struct nlattr
*data
= nla_nest_start(skb
, NFTA_EXPR_DATA
);
1688 goto nla_put_failure
;
1689 if (expr
->ops
->dump(skb
, expr
) < 0)
1690 goto nla_put_failure
;
1691 nla_nest_end(skb
, data
);
1700 int nft_expr_dump(struct sk_buff
*skb
, unsigned int attr
,
1701 const struct nft_expr
*expr
)
1703 struct nlattr
*nest
;
1705 nest
= nla_nest_start(skb
, attr
);
1707 goto nla_put_failure
;
1708 if (nf_tables_fill_expr_info(skb
, expr
) < 0)
1709 goto nla_put_failure
;
1710 nla_nest_end(skb
, nest
);
1717 struct nft_expr_info
{
1718 const struct nft_expr_ops
*ops
;
1719 struct nlattr
*tb
[NFT_EXPR_MAXATTR
+ 1];
1722 static int nf_tables_expr_parse(const struct nft_ctx
*ctx
,
1723 const struct nlattr
*nla
,
1724 struct nft_expr_info
*info
)
1726 const struct nft_expr_type
*type
;
1727 const struct nft_expr_ops
*ops
;
1728 struct nlattr
*tb
[NFTA_EXPR_MAX
+ 1];
1731 err
= nla_parse_nested(tb
, NFTA_EXPR_MAX
, nla
, nft_expr_policy
);
1735 type
= nft_expr_type_get(ctx
->afi
->family
, tb
[NFTA_EXPR_NAME
]);
1737 return PTR_ERR(type
);
1739 if (tb
[NFTA_EXPR_DATA
]) {
1740 err
= nla_parse_nested(info
->tb
, type
->maxattr
,
1741 tb
[NFTA_EXPR_DATA
], type
->policy
);
1745 memset(info
->tb
, 0, sizeof(info
->tb
[0]) * (type
->maxattr
+ 1));
1747 if (type
->select_ops
!= NULL
) {
1748 ops
= type
->select_ops(ctx
,
1749 (const struct nlattr
* const *)info
->tb
);
1761 module_put(type
->owner
);
1765 static int nf_tables_newexpr(const struct nft_ctx
*ctx
,
1766 const struct nft_expr_info
*info
,
1767 struct nft_expr
*expr
)
1769 const struct nft_expr_ops
*ops
= info
->ops
;
1774 err
= ops
->init(ctx
, expr
, (const struct nlattr
**)info
->tb
);
1786 static void nf_tables_expr_destroy(const struct nft_ctx
*ctx
,
1787 struct nft_expr
*expr
)
1789 if (expr
->ops
->destroy
)
1790 expr
->ops
->destroy(ctx
, expr
);
1791 module_put(expr
->ops
->type
->owner
);
1794 struct nft_expr
*nft_expr_init(const struct nft_ctx
*ctx
,
1795 const struct nlattr
*nla
)
1797 struct nft_expr_info info
;
1798 struct nft_expr
*expr
;
1801 err
= nf_tables_expr_parse(ctx
, nla
, &info
);
1806 expr
= kzalloc(info
.ops
->size
, GFP_KERNEL
);
1810 err
= nf_tables_newexpr(ctx
, &info
, expr
);
1818 module_put(info
.ops
->type
->owner
);
1820 return ERR_PTR(err
);
1823 void nft_expr_destroy(const struct nft_ctx
*ctx
, struct nft_expr
*expr
)
1825 nf_tables_expr_destroy(ctx
, expr
);
1833 static struct nft_rule
*__nf_tables_rule_lookup(const struct nft_chain
*chain
,
1836 struct nft_rule
*rule
;
1838 // FIXME: this sucks
1839 list_for_each_entry(rule
, &chain
->rules
, list
) {
1840 if (handle
== rule
->handle
)
1844 return ERR_PTR(-ENOENT
);
1847 static struct nft_rule
*nf_tables_rule_lookup(const struct nft_chain
*chain
,
1848 const struct nlattr
*nla
)
1851 return ERR_PTR(-EINVAL
);
1853 return __nf_tables_rule_lookup(chain
, be64_to_cpu(nla_get_be64(nla
)));
1856 static const struct nla_policy nft_rule_policy
[NFTA_RULE_MAX
+ 1] = {
1857 [NFTA_RULE_TABLE
] = { .type
= NLA_STRING
},
1858 [NFTA_RULE_CHAIN
] = { .type
= NLA_STRING
,
1859 .len
= NFT_CHAIN_MAXNAMELEN
- 1 },
1860 [NFTA_RULE_HANDLE
] = { .type
= NLA_U64
},
1861 [NFTA_RULE_EXPRESSIONS
] = { .type
= NLA_NESTED
},
1862 [NFTA_RULE_COMPAT
] = { .type
= NLA_NESTED
},
1863 [NFTA_RULE_POSITION
] = { .type
= NLA_U64
},
1864 [NFTA_RULE_USERDATA
] = { .type
= NLA_BINARY
,
1865 .len
= NFT_USERDATA_MAXLEN
},
1868 static int nf_tables_fill_rule_info(struct sk_buff
*skb
, struct net
*net
,
1869 u32 portid
, u32 seq
, int event
,
1870 u32 flags
, int family
,
1871 const struct nft_table
*table
,
1872 const struct nft_chain
*chain
,
1873 const struct nft_rule
*rule
)
1875 struct nlmsghdr
*nlh
;
1876 struct nfgenmsg
*nfmsg
;
1877 const struct nft_expr
*expr
, *next
;
1878 struct nlattr
*list
;
1879 const struct nft_rule
*prule
;
1880 int type
= event
| NFNL_SUBSYS_NFTABLES
<< 8;
1882 nlh
= nlmsg_put(skb
, portid
, seq
, type
, sizeof(struct nfgenmsg
),
1885 goto nla_put_failure
;
1887 nfmsg
= nlmsg_data(nlh
);
1888 nfmsg
->nfgen_family
= family
;
1889 nfmsg
->version
= NFNETLINK_V0
;
1890 nfmsg
->res_id
= htons(net
->nft
.base_seq
& 0xffff);
1892 if (nla_put_string(skb
, NFTA_RULE_TABLE
, table
->name
))
1893 goto nla_put_failure
;
1894 if (nla_put_string(skb
, NFTA_RULE_CHAIN
, chain
->name
))
1895 goto nla_put_failure
;
1896 if (nla_put_be64(skb
, NFTA_RULE_HANDLE
, cpu_to_be64(rule
->handle
),
1898 goto nla_put_failure
;
1900 if ((event
!= NFT_MSG_DELRULE
) && (rule
->list
.prev
!= &chain
->rules
)) {
1901 prule
= list_entry(rule
->list
.prev
, struct nft_rule
, list
);
1902 if (nla_put_be64(skb
, NFTA_RULE_POSITION
,
1903 cpu_to_be64(prule
->handle
),
1905 goto nla_put_failure
;
1908 list
= nla_nest_start(skb
, NFTA_RULE_EXPRESSIONS
);
1910 goto nla_put_failure
;
1911 nft_rule_for_each_expr(expr
, next
, rule
) {
1912 if (nft_expr_dump(skb
, NFTA_LIST_ELEM
, expr
) < 0)
1913 goto nla_put_failure
;
1915 nla_nest_end(skb
, list
);
1918 struct nft_userdata
*udata
= nft_userdata(rule
);
1919 if (nla_put(skb
, NFTA_RULE_USERDATA
, udata
->len
+ 1,
1921 goto nla_put_failure
;
1924 nlmsg_end(skb
, nlh
);
1928 nlmsg_trim(skb
, nlh
);
1932 static int nf_tables_rule_notify(const struct nft_ctx
*ctx
,
1933 const struct nft_rule
*rule
,
1936 struct sk_buff
*skb
;
1940 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
1944 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
1948 err
= nf_tables_fill_rule_info(skb
, ctx
->net
, ctx
->portid
, ctx
->seq
,
1949 event
, 0, ctx
->afi
->family
, ctx
->table
,
1956 err
= nfnetlink_send(skb
, ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
1957 ctx
->report
, GFP_KERNEL
);
1960 nfnetlink_set_err(ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
1966 struct nft_rule_dump_ctx
{
1967 char table
[NFT_TABLE_MAXNAMELEN
];
1968 char chain
[NFT_CHAIN_MAXNAMELEN
];
1971 static int nf_tables_dump_rules(struct sk_buff
*skb
,
1972 struct netlink_callback
*cb
)
1974 const struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
1975 const struct nft_rule_dump_ctx
*ctx
= cb
->data
;
1976 const struct nft_af_info
*afi
;
1977 const struct nft_table
*table
;
1978 const struct nft_chain
*chain
;
1979 const struct nft_rule
*rule
;
1980 unsigned int idx
= 0, s_idx
= cb
->args
[0];
1981 struct net
*net
= sock_net(skb
->sk
);
1982 int family
= nfmsg
->nfgen_family
;
1985 cb
->seq
= net
->nft
.base_seq
;
1987 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
1988 if (family
!= NFPROTO_UNSPEC
&& family
!= afi
->family
)
1991 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
1992 if (ctx
&& ctx
->table
[0] &&
1993 strcmp(ctx
->table
, table
->name
) != 0)
1996 list_for_each_entry_rcu(chain
, &table
->chains
, list
) {
1997 if (ctx
&& ctx
->chain
[0] &&
1998 strcmp(ctx
->chain
, chain
->name
) != 0)
2001 list_for_each_entry_rcu(rule
, &chain
->rules
, list
) {
2002 if (!nft_is_active(net
, rule
))
2007 memset(&cb
->args
[1], 0,
2008 sizeof(cb
->args
) - sizeof(cb
->args
[0]));
2009 if (nf_tables_fill_rule_info(skb
, net
, NETLINK_CB(cb
->skb
).portid
,
2012 NLM_F_MULTI
| NLM_F_APPEND
,
2013 afi
->family
, table
, chain
, rule
) < 0)
2016 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
2030 static int nf_tables_dump_rules_done(struct netlink_callback
*cb
)
2036 static int nf_tables_getrule(struct net
*net
, struct sock
*nlsk
,
2037 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
2038 const struct nlattr
* const nla
[])
2040 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2041 u8 genmask
= nft_genmask_cur(net
);
2042 const struct nft_af_info
*afi
;
2043 const struct nft_table
*table
;
2044 const struct nft_chain
*chain
;
2045 const struct nft_rule
*rule
;
2046 struct sk_buff
*skb2
;
2047 int family
= nfmsg
->nfgen_family
;
2050 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
2051 struct netlink_dump_control c
= {
2052 .dump
= nf_tables_dump_rules
,
2053 .done
= nf_tables_dump_rules_done
,
2056 if (nla
[NFTA_RULE_TABLE
] || nla
[NFTA_RULE_CHAIN
]) {
2057 struct nft_rule_dump_ctx
*ctx
;
2059 ctx
= kzalloc(sizeof(*ctx
), GFP_KERNEL
);
2063 if (nla
[NFTA_RULE_TABLE
])
2064 nla_strlcpy(ctx
->table
, nla
[NFTA_RULE_TABLE
],
2065 sizeof(ctx
->table
));
2066 if (nla
[NFTA_RULE_CHAIN
])
2067 nla_strlcpy(ctx
->chain
, nla
[NFTA_RULE_CHAIN
],
2068 sizeof(ctx
->chain
));
2072 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
2075 afi
= nf_tables_afinfo_lookup(net
, family
, false);
2077 return PTR_ERR(afi
);
2079 table
= nf_tables_table_lookup(afi
, nla
[NFTA_RULE_TABLE
], genmask
);
2081 return PTR_ERR(table
);
2083 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_RULE_CHAIN
], genmask
);
2085 return PTR_ERR(chain
);
2087 rule
= nf_tables_rule_lookup(chain
, nla
[NFTA_RULE_HANDLE
]);
2089 return PTR_ERR(rule
);
2091 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
2095 err
= nf_tables_fill_rule_info(skb2
, net
, NETLINK_CB(skb
).portid
,
2096 nlh
->nlmsg_seq
, NFT_MSG_NEWRULE
, 0,
2097 family
, table
, chain
, rule
);
2101 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
2108 static void nf_tables_rule_destroy(const struct nft_ctx
*ctx
,
2109 struct nft_rule
*rule
)
2111 struct nft_expr
*expr
;
2114 * Careful: some expressions might not be initialized in case this
2115 * is called on error from nf_tables_newrule().
2117 expr
= nft_expr_first(rule
);
2118 while (expr
!= nft_expr_last(rule
) && expr
->ops
) {
2119 nf_tables_expr_destroy(ctx
, expr
);
2120 expr
= nft_expr_next(expr
);
2125 #define NFT_RULE_MAXEXPRS 128
2127 static struct nft_expr_info
*info
;
2129 static int nf_tables_newrule(struct net
*net
, struct sock
*nlsk
,
2130 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
2131 const struct nlattr
* const nla
[])
2133 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2134 u8 genmask
= nft_genmask_next(net
);
2135 struct nft_af_info
*afi
;
2136 struct nft_table
*table
;
2137 struct nft_chain
*chain
;
2138 struct nft_rule
*rule
, *old_rule
= NULL
;
2139 struct nft_userdata
*udata
;
2140 struct nft_trans
*trans
= NULL
;
2141 struct nft_expr
*expr
;
2144 unsigned int size
, i
, n
, ulen
= 0, usize
= 0;
2147 u64 handle
, pos_handle
;
2149 create
= nlh
->nlmsg_flags
& NLM_F_CREATE
? true : false;
2151 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, create
);
2153 return PTR_ERR(afi
);
2155 table
= nf_tables_table_lookup(afi
, nla
[NFTA_RULE_TABLE
], genmask
);
2157 return PTR_ERR(table
);
2159 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_RULE_CHAIN
], genmask
);
2161 return PTR_ERR(chain
);
2163 if (nla
[NFTA_RULE_HANDLE
]) {
2164 handle
= be64_to_cpu(nla_get_be64(nla
[NFTA_RULE_HANDLE
]));
2165 rule
= __nf_tables_rule_lookup(chain
, handle
);
2167 return PTR_ERR(rule
);
2169 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
2171 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
2176 if (!create
|| nlh
->nlmsg_flags
& NLM_F_REPLACE
)
2178 handle
= nf_tables_alloc_handle(table
);
2180 if (chain
->use
== UINT_MAX
)
2184 if (nla
[NFTA_RULE_POSITION
]) {
2185 if (!(nlh
->nlmsg_flags
& NLM_F_CREATE
))
2188 pos_handle
= be64_to_cpu(nla_get_be64(nla
[NFTA_RULE_POSITION
]));
2189 old_rule
= __nf_tables_rule_lookup(chain
, pos_handle
);
2190 if (IS_ERR(old_rule
))
2191 return PTR_ERR(old_rule
);
2194 nft_ctx_init(&ctx
, net
, skb
, nlh
, afi
, table
, chain
, nla
);
2198 if (nla
[NFTA_RULE_EXPRESSIONS
]) {
2199 nla_for_each_nested(tmp
, nla
[NFTA_RULE_EXPRESSIONS
], rem
) {
2201 if (nla_type(tmp
) != NFTA_LIST_ELEM
)
2203 if (n
== NFT_RULE_MAXEXPRS
)
2205 err
= nf_tables_expr_parse(&ctx
, tmp
, &info
[n
]);
2208 size
+= info
[n
].ops
->size
;
2212 /* Check for overflow of dlen field */
2214 if (size
>= 1 << 12)
2217 if (nla
[NFTA_RULE_USERDATA
]) {
2218 ulen
= nla_len(nla
[NFTA_RULE_USERDATA
]);
2220 usize
= sizeof(struct nft_userdata
) + ulen
;
2224 rule
= kzalloc(sizeof(*rule
) + size
+ usize
, GFP_KERNEL
);
2228 nft_activate_next(net
, rule
);
2230 rule
->handle
= handle
;
2232 rule
->udata
= ulen
? 1 : 0;
2235 udata
= nft_userdata(rule
);
2236 udata
->len
= ulen
- 1;
2237 nla_memcpy(udata
->data
, nla
[NFTA_RULE_USERDATA
], ulen
);
2240 expr
= nft_expr_first(rule
);
2241 for (i
= 0; i
< n
; i
++) {
2242 err
= nf_tables_newexpr(&ctx
, &info
[i
], expr
);
2246 expr
= nft_expr_next(expr
);
2249 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
) {
2250 if (nft_is_active_next(net
, old_rule
)) {
2251 trans
= nft_trans_rule_add(&ctx
, NFT_MSG_DELRULE
,
2253 if (trans
== NULL
) {
2257 nft_deactivate_next(net
, old_rule
);
2259 list_add_tail_rcu(&rule
->list
, &old_rule
->list
);
2264 } else if (nlh
->nlmsg_flags
& NLM_F_APPEND
)
2266 list_add_rcu(&rule
->list
, &old_rule
->list
);
2268 list_add_tail_rcu(&rule
->list
, &chain
->rules
);
2271 list_add_tail_rcu(&rule
->list
, &old_rule
->list
);
2273 list_add_rcu(&rule
->list
, &chain
->rules
);
2276 if (nft_trans_rule_add(&ctx
, NFT_MSG_NEWRULE
, rule
) == NULL
) {
2284 list_del_rcu(&rule
->list
);
2286 nf_tables_rule_destroy(&ctx
, rule
);
2288 for (i
= 0; i
< n
; i
++) {
2289 if (info
[i
].ops
!= NULL
)
2290 module_put(info
[i
].ops
->type
->owner
);
2295 static int nf_tables_delrule(struct net
*net
, struct sock
*nlsk
,
2296 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
2297 const struct nlattr
* const nla
[])
2299 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2300 u8 genmask
= nft_genmask_next(net
);
2301 struct nft_af_info
*afi
;
2302 struct nft_table
*table
;
2303 struct nft_chain
*chain
= NULL
;
2304 struct nft_rule
*rule
;
2305 int family
= nfmsg
->nfgen_family
, err
= 0;
2308 afi
= nf_tables_afinfo_lookup(net
, family
, false);
2310 return PTR_ERR(afi
);
2312 table
= nf_tables_table_lookup(afi
, nla
[NFTA_RULE_TABLE
], genmask
);
2314 return PTR_ERR(table
);
2316 if (nla
[NFTA_RULE_CHAIN
]) {
2317 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_RULE_CHAIN
],
2320 return PTR_ERR(chain
);
2323 nft_ctx_init(&ctx
, net
, skb
, nlh
, afi
, table
, chain
, nla
);
2326 if (nla
[NFTA_RULE_HANDLE
]) {
2327 rule
= nf_tables_rule_lookup(chain
,
2328 nla
[NFTA_RULE_HANDLE
]);
2330 return PTR_ERR(rule
);
2332 err
= nft_delrule(&ctx
, rule
);
2334 err
= nft_delrule_by_chain(&ctx
);
2337 list_for_each_entry(chain
, &table
->chains
, list
) {
2338 if (!nft_is_active_next(net
, chain
))
2342 err
= nft_delrule_by_chain(&ctx
);
2355 static LIST_HEAD(nf_tables_set_ops
);
2357 int nft_register_set(struct nft_set_ops
*ops
)
2359 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
2360 list_add_tail_rcu(&ops
->list
, &nf_tables_set_ops
);
2361 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
2364 EXPORT_SYMBOL_GPL(nft_register_set
);
2366 void nft_unregister_set(struct nft_set_ops
*ops
)
2368 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
2369 list_del_rcu(&ops
->list
);
2370 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
2372 EXPORT_SYMBOL_GPL(nft_unregister_set
);
2375 * Select a set implementation based on the data characteristics and the
2376 * given policy. The total memory use might not be known if no size is
2377 * given, in that case the amount of memory per element is used.
2379 static const struct nft_set_ops
*
2380 nft_select_set_ops(const struct nlattr
* const nla
[],
2381 const struct nft_set_desc
*desc
,
2382 enum nft_set_policies policy
)
2384 const struct nft_set_ops
*ops
, *bops
;
2385 struct nft_set_estimate est
, best
;
2388 #ifdef CONFIG_MODULES
2389 if (list_empty(&nf_tables_set_ops
)) {
2390 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
2391 request_module("nft-set");
2392 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
2393 if (!list_empty(&nf_tables_set_ops
))
2394 return ERR_PTR(-EAGAIN
);
2398 if (nla
[NFTA_SET_FLAGS
] != NULL
) {
2399 features
= ntohl(nla_get_be32(nla
[NFTA_SET_FLAGS
]));
2400 features
&= NFT_SET_INTERVAL
| NFT_SET_MAP
| NFT_SET_TIMEOUT
;
2407 list_for_each_entry(ops
, &nf_tables_set_ops
, list
) {
2408 if ((ops
->features
& features
) != features
)
2410 if (!ops
->estimate(desc
, features
, &est
))
2414 case NFT_SET_POL_PERFORMANCE
:
2415 if (est
.class < best
.class)
2417 if (est
.class == best
.class && est
.size
< best
.size
)
2420 case NFT_SET_POL_MEMORY
:
2421 if (est
.size
< best
.size
)
2423 if (est
.size
== best
.size
&& est
.class < best
.class)
2430 if (!try_module_get(ops
->owner
))
2433 module_put(bops
->owner
);
2442 return ERR_PTR(-EOPNOTSUPP
);
2445 static const struct nla_policy nft_set_policy
[NFTA_SET_MAX
+ 1] = {
2446 [NFTA_SET_TABLE
] = { .type
= NLA_STRING
},
2447 [NFTA_SET_NAME
] = { .type
= NLA_STRING
,
2448 .len
= NFT_SET_MAXNAMELEN
- 1 },
2449 [NFTA_SET_FLAGS
] = { .type
= NLA_U32
},
2450 [NFTA_SET_KEY_TYPE
] = { .type
= NLA_U32
},
2451 [NFTA_SET_KEY_LEN
] = { .type
= NLA_U32
},
2452 [NFTA_SET_DATA_TYPE
] = { .type
= NLA_U32
},
2453 [NFTA_SET_DATA_LEN
] = { .type
= NLA_U32
},
2454 [NFTA_SET_POLICY
] = { .type
= NLA_U32
},
2455 [NFTA_SET_DESC
] = { .type
= NLA_NESTED
},
2456 [NFTA_SET_ID
] = { .type
= NLA_U32
},
2457 [NFTA_SET_TIMEOUT
] = { .type
= NLA_U64
},
2458 [NFTA_SET_GC_INTERVAL
] = { .type
= NLA_U32
},
2459 [NFTA_SET_USERDATA
] = { .type
= NLA_BINARY
,
2460 .len
= NFT_USERDATA_MAXLEN
},
2461 [NFTA_SET_OBJ_TYPE
] = { .type
= NLA_U32
},
2464 static const struct nla_policy nft_set_desc_policy
[NFTA_SET_DESC_MAX
+ 1] = {
2465 [NFTA_SET_DESC_SIZE
] = { .type
= NLA_U32
},
2468 static int nft_ctx_init_from_setattr(struct nft_ctx
*ctx
, struct net
*net
,
2469 const struct sk_buff
*skb
,
2470 const struct nlmsghdr
*nlh
,
2471 const struct nlattr
* const nla
[],
2474 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2475 struct nft_af_info
*afi
= NULL
;
2476 struct nft_table
*table
= NULL
;
2478 if (nfmsg
->nfgen_family
!= NFPROTO_UNSPEC
) {
2479 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, false);
2481 return PTR_ERR(afi
);
2484 if (nla
[NFTA_SET_TABLE
] != NULL
) {
2486 return -EAFNOSUPPORT
;
2488 table
= nf_tables_table_lookup(afi
, nla
[NFTA_SET_TABLE
],
2491 return PTR_ERR(table
);
2494 nft_ctx_init(ctx
, net
, skb
, nlh
, afi
, table
, NULL
, nla
);
2498 struct nft_set
*nf_tables_set_lookup(const struct nft_table
*table
,
2499 const struct nlattr
*nla
, u8 genmask
)
2501 struct nft_set
*set
;
2504 return ERR_PTR(-EINVAL
);
2506 list_for_each_entry(set
, &table
->sets
, list
) {
2507 if (!nla_strcmp(nla
, set
->name
) &&
2508 nft_active_genmask(set
, genmask
))
2511 return ERR_PTR(-ENOENT
);
2513 EXPORT_SYMBOL_GPL(nf_tables_set_lookup
);
2515 struct nft_set
*nf_tables_set_lookup_byid(const struct net
*net
,
2516 const struct nlattr
*nla
,
2519 struct nft_trans
*trans
;
2520 u32 id
= ntohl(nla_get_be32(nla
));
2522 list_for_each_entry(trans
, &net
->nft
.commit_list
, list
) {
2523 struct nft_set
*set
= nft_trans_set(trans
);
2525 if (trans
->msg_type
== NFT_MSG_NEWSET
&&
2526 id
== nft_trans_set_id(trans
) &&
2527 nft_active_genmask(set
, genmask
))
2530 return ERR_PTR(-ENOENT
);
2532 EXPORT_SYMBOL_GPL(nf_tables_set_lookup_byid
);
2534 static int nf_tables_set_alloc_name(struct nft_ctx
*ctx
, struct nft_set
*set
,
2537 const struct nft_set
*i
;
2539 unsigned long *inuse
;
2540 unsigned int n
= 0, min
= 0;
2542 p
= strnchr(name
, NFT_SET_MAXNAMELEN
, '%');
2544 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
2547 inuse
= (unsigned long *)get_zeroed_page(GFP_KERNEL
);
2551 list_for_each_entry(i
, &ctx
->table
->sets
, list
) {
2554 if (!nft_is_active_next(ctx
->net
, set
))
2556 if (!sscanf(i
->name
, name
, &tmp
))
2558 if (tmp
< min
|| tmp
>= min
+ BITS_PER_BYTE
* PAGE_SIZE
)
2561 set_bit(tmp
- min
, inuse
);
2564 n
= find_first_zero_bit(inuse
, BITS_PER_BYTE
* PAGE_SIZE
);
2565 if (n
>= BITS_PER_BYTE
* PAGE_SIZE
) {
2566 min
+= BITS_PER_BYTE
* PAGE_SIZE
;
2567 memset(inuse
, 0, PAGE_SIZE
);
2570 free_page((unsigned long)inuse
);
2573 snprintf(set
->name
, sizeof(set
->name
), name
, min
+ n
);
2574 list_for_each_entry(i
, &ctx
->table
->sets
, list
) {
2575 if (!nft_is_active_next(ctx
->net
, i
))
2577 if (!strcmp(set
->name
, i
->name
))
2583 static int nf_tables_fill_set(struct sk_buff
*skb
, const struct nft_ctx
*ctx
,
2584 const struct nft_set
*set
, u16 event
, u16 flags
)
2586 struct nfgenmsg
*nfmsg
;
2587 struct nlmsghdr
*nlh
;
2588 struct nlattr
*desc
;
2589 u32 portid
= ctx
->portid
;
2592 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
2593 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
),
2596 goto nla_put_failure
;
2598 nfmsg
= nlmsg_data(nlh
);
2599 nfmsg
->nfgen_family
= ctx
->afi
->family
;
2600 nfmsg
->version
= NFNETLINK_V0
;
2601 nfmsg
->res_id
= htons(ctx
->net
->nft
.base_seq
& 0xffff);
2603 if (nla_put_string(skb
, NFTA_SET_TABLE
, ctx
->table
->name
))
2604 goto nla_put_failure
;
2605 if (nla_put_string(skb
, NFTA_SET_NAME
, set
->name
))
2606 goto nla_put_failure
;
2607 if (set
->flags
!= 0)
2608 if (nla_put_be32(skb
, NFTA_SET_FLAGS
, htonl(set
->flags
)))
2609 goto nla_put_failure
;
2611 if (nla_put_be32(skb
, NFTA_SET_KEY_TYPE
, htonl(set
->ktype
)))
2612 goto nla_put_failure
;
2613 if (nla_put_be32(skb
, NFTA_SET_KEY_LEN
, htonl(set
->klen
)))
2614 goto nla_put_failure
;
2615 if (set
->flags
& NFT_SET_MAP
) {
2616 if (nla_put_be32(skb
, NFTA_SET_DATA_TYPE
, htonl(set
->dtype
)))
2617 goto nla_put_failure
;
2618 if (nla_put_be32(skb
, NFTA_SET_DATA_LEN
, htonl(set
->dlen
)))
2619 goto nla_put_failure
;
2621 if (set
->flags
& NFT_SET_OBJECT
&&
2622 nla_put_be32(skb
, NFTA_SET_OBJ_TYPE
, htonl(set
->objtype
)))
2623 goto nla_put_failure
;
2626 nla_put_be64(skb
, NFTA_SET_TIMEOUT
,
2627 cpu_to_be64(jiffies_to_msecs(set
->timeout
)),
2629 goto nla_put_failure
;
2631 nla_put_be32(skb
, NFTA_SET_GC_INTERVAL
, htonl(set
->gc_int
)))
2632 goto nla_put_failure
;
2634 if (set
->policy
!= NFT_SET_POL_PERFORMANCE
) {
2635 if (nla_put_be32(skb
, NFTA_SET_POLICY
, htonl(set
->policy
)))
2636 goto nla_put_failure
;
2639 if (nla_put(skb
, NFTA_SET_USERDATA
, set
->udlen
, set
->udata
))
2640 goto nla_put_failure
;
2642 desc
= nla_nest_start(skb
, NFTA_SET_DESC
);
2644 goto nla_put_failure
;
2646 nla_put_be32(skb
, NFTA_SET_DESC_SIZE
, htonl(set
->size
)))
2647 goto nla_put_failure
;
2648 nla_nest_end(skb
, desc
);
2650 nlmsg_end(skb
, nlh
);
2654 nlmsg_trim(skb
, nlh
);
2658 static int nf_tables_set_notify(const struct nft_ctx
*ctx
,
2659 const struct nft_set
*set
,
2660 int event
, gfp_t gfp_flags
)
2662 struct sk_buff
*skb
;
2663 u32 portid
= ctx
->portid
;
2667 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
2671 skb
= nlmsg_new(NLMSG_GOODSIZE
, gfp_flags
);
2675 err
= nf_tables_fill_set(skb
, ctx
, set
, event
, 0);
2681 err
= nfnetlink_send(skb
, ctx
->net
, portid
, NFNLGRP_NFTABLES
,
2682 ctx
->report
, gfp_flags
);
2685 nfnetlink_set_err(ctx
->net
, portid
, NFNLGRP_NFTABLES
, err
);
2689 static int nf_tables_dump_sets(struct sk_buff
*skb
, struct netlink_callback
*cb
)
2691 const struct nft_set
*set
;
2692 unsigned int idx
, s_idx
= cb
->args
[0];
2693 struct nft_af_info
*afi
;
2694 struct nft_table
*table
, *cur_table
= (struct nft_table
*)cb
->args
[2];
2695 struct net
*net
= sock_net(skb
->sk
);
2696 int cur_family
= cb
->args
[3];
2697 struct nft_ctx
*ctx
= cb
->data
, ctx_set
;
2703 cb
->seq
= net
->nft
.base_seq
;
2705 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
2706 if (ctx
->afi
&& ctx
->afi
!= afi
)
2710 if (afi
->family
!= cur_family
)
2715 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
2716 if (ctx
->table
&& ctx
->table
!= table
)
2720 if (cur_table
!= table
)
2726 list_for_each_entry_rcu(set
, &table
->sets
, list
) {
2729 if (!nft_is_active(net
, set
))
2733 ctx_set
.table
= table
;
2735 if (nf_tables_fill_set(skb
, &ctx_set
, set
,
2739 cb
->args
[2] = (unsigned long) table
;
2740 cb
->args
[3] = afi
->family
;
2743 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
2757 static int nf_tables_dump_sets_done(struct netlink_callback
*cb
)
2763 static int nf_tables_getset(struct net
*net
, struct sock
*nlsk
,
2764 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
2765 const struct nlattr
* const nla
[])
2767 u8 genmask
= nft_genmask_cur(net
);
2768 const struct nft_set
*set
;
2770 struct sk_buff
*skb2
;
2771 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2774 /* Verify existence before starting dump */
2775 err
= nft_ctx_init_from_setattr(&ctx
, net
, skb
, nlh
, nla
, genmask
);
2779 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
2780 struct netlink_dump_control c
= {
2781 .dump
= nf_tables_dump_sets
,
2782 .done
= nf_tables_dump_sets_done
,
2784 struct nft_ctx
*ctx_dump
;
2786 ctx_dump
= kmalloc(sizeof(*ctx_dump
), GFP_KERNEL
);
2787 if (ctx_dump
== NULL
)
2793 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
2796 /* Only accept unspec with dump */
2797 if (nfmsg
->nfgen_family
== NFPROTO_UNSPEC
)
2798 return -EAFNOSUPPORT
;
2799 if (!nla
[NFTA_SET_TABLE
])
2802 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_NAME
], genmask
);
2804 return PTR_ERR(set
);
2806 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
2810 err
= nf_tables_fill_set(skb2
, &ctx
, set
, NFT_MSG_NEWSET
, 0);
2814 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
2821 static int nf_tables_set_desc_parse(const struct nft_ctx
*ctx
,
2822 struct nft_set_desc
*desc
,
2823 const struct nlattr
*nla
)
2825 struct nlattr
*da
[NFTA_SET_DESC_MAX
+ 1];
2828 err
= nla_parse_nested(da
, NFTA_SET_DESC_MAX
, nla
, nft_set_desc_policy
);
2832 if (da
[NFTA_SET_DESC_SIZE
] != NULL
)
2833 desc
->size
= ntohl(nla_get_be32(da
[NFTA_SET_DESC_SIZE
]));
2838 static int nf_tables_newset(struct net
*net
, struct sock
*nlsk
,
2839 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
2840 const struct nlattr
* const nla
[])
2842 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2843 u8 genmask
= nft_genmask_next(net
);
2844 const struct nft_set_ops
*ops
;
2845 struct nft_af_info
*afi
;
2846 struct nft_table
*table
;
2847 struct nft_set
*set
;
2849 char name
[NFT_SET_MAXNAMELEN
];
2853 u32 ktype
, dtype
, flags
, policy
, gc_int
, objtype
;
2854 struct nft_set_desc desc
;
2855 unsigned char *udata
;
2859 if (nla
[NFTA_SET_TABLE
] == NULL
||
2860 nla
[NFTA_SET_NAME
] == NULL
||
2861 nla
[NFTA_SET_KEY_LEN
] == NULL
||
2862 nla
[NFTA_SET_ID
] == NULL
)
2865 memset(&desc
, 0, sizeof(desc
));
2867 ktype
= NFT_DATA_VALUE
;
2868 if (nla
[NFTA_SET_KEY_TYPE
] != NULL
) {
2869 ktype
= ntohl(nla_get_be32(nla
[NFTA_SET_KEY_TYPE
]));
2870 if ((ktype
& NFT_DATA_RESERVED_MASK
) == NFT_DATA_RESERVED_MASK
)
2874 desc
.klen
= ntohl(nla_get_be32(nla
[NFTA_SET_KEY_LEN
]));
2875 if (desc
.klen
== 0 || desc
.klen
> NFT_DATA_VALUE_MAXLEN
)
2879 if (nla
[NFTA_SET_FLAGS
] != NULL
) {
2880 flags
= ntohl(nla_get_be32(nla
[NFTA_SET_FLAGS
]));
2881 if (flags
& ~(NFT_SET_ANONYMOUS
| NFT_SET_CONSTANT
|
2882 NFT_SET_INTERVAL
| NFT_SET_TIMEOUT
|
2883 NFT_SET_MAP
| NFT_SET_EVAL
|
2886 /* Only one of these operations is supported */
2887 if ((flags
& (NFT_SET_MAP
| NFT_SET_EVAL
| NFT_SET_OBJECT
)) ==
2888 (NFT_SET_MAP
| NFT_SET_EVAL
| NFT_SET_OBJECT
))
2893 if (nla
[NFTA_SET_DATA_TYPE
] != NULL
) {
2894 if (!(flags
& NFT_SET_MAP
))
2897 dtype
= ntohl(nla_get_be32(nla
[NFTA_SET_DATA_TYPE
]));
2898 if ((dtype
& NFT_DATA_RESERVED_MASK
) == NFT_DATA_RESERVED_MASK
&&
2899 dtype
!= NFT_DATA_VERDICT
)
2902 if (dtype
!= NFT_DATA_VERDICT
) {
2903 if (nla
[NFTA_SET_DATA_LEN
] == NULL
)
2905 desc
.dlen
= ntohl(nla_get_be32(nla
[NFTA_SET_DATA_LEN
]));
2906 if (desc
.dlen
== 0 || desc
.dlen
> NFT_DATA_VALUE_MAXLEN
)
2909 desc
.dlen
= sizeof(struct nft_verdict
);
2910 } else if (flags
& NFT_SET_MAP
)
2913 if (nla
[NFTA_SET_OBJ_TYPE
] != NULL
) {
2914 if (!(flags
& NFT_SET_OBJECT
))
2917 objtype
= ntohl(nla_get_be32(nla
[NFTA_SET_OBJ_TYPE
]));
2918 if (objtype
== NFT_OBJECT_UNSPEC
||
2919 objtype
> NFT_OBJECT_MAX
)
2921 } else if (flags
& NFT_SET_OBJECT
)
2924 objtype
= NFT_OBJECT_UNSPEC
;
2927 if (nla
[NFTA_SET_TIMEOUT
] != NULL
) {
2928 if (!(flags
& NFT_SET_TIMEOUT
))
2930 timeout
= msecs_to_jiffies(be64_to_cpu(nla_get_be64(
2931 nla
[NFTA_SET_TIMEOUT
])));
2934 if (nla
[NFTA_SET_GC_INTERVAL
] != NULL
) {
2935 if (!(flags
& NFT_SET_TIMEOUT
))
2937 gc_int
= ntohl(nla_get_be32(nla
[NFTA_SET_GC_INTERVAL
]));
2940 policy
= NFT_SET_POL_PERFORMANCE
;
2941 if (nla
[NFTA_SET_POLICY
] != NULL
)
2942 policy
= ntohl(nla_get_be32(nla
[NFTA_SET_POLICY
]));
2944 if (nla
[NFTA_SET_DESC
] != NULL
) {
2945 err
= nf_tables_set_desc_parse(&ctx
, &desc
, nla
[NFTA_SET_DESC
]);
2950 create
= nlh
->nlmsg_flags
& NLM_F_CREATE
? true : false;
2952 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, create
);
2954 return PTR_ERR(afi
);
2956 table
= nf_tables_table_lookup(afi
, nla
[NFTA_SET_TABLE
], genmask
);
2958 return PTR_ERR(table
);
2960 nft_ctx_init(&ctx
, net
, skb
, nlh
, afi
, table
, NULL
, nla
);
2962 set
= nf_tables_set_lookup(table
, nla
[NFTA_SET_NAME
], genmask
);
2964 if (PTR_ERR(set
) != -ENOENT
)
2965 return PTR_ERR(set
);
2970 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
2972 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
2977 if (!(nlh
->nlmsg_flags
& NLM_F_CREATE
))
2980 ops
= nft_select_set_ops(nla
, &desc
, policy
);
2982 return PTR_ERR(ops
);
2985 if (nla
[NFTA_SET_USERDATA
])
2986 udlen
= nla_len(nla
[NFTA_SET_USERDATA
]);
2989 if (ops
->privsize
!= NULL
)
2990 size
= ops
->privsize(nla
);
2993 set
= kzalloc(sizeof(*set
) + size
+ udlen
, GFP_KERNEL
);
2997 nla_strlcpy(name
, nla
[NFTA_SET_NAME
], sizeof(set
->name
));
2998 err
= nf_tables_set_alloc_name(&ctx
, set
, name
);
3004 udata
= set
->data
+ size
;
3005 nla_memcpy(udata
, nla
[NFTA_SET_USERDATA
], udlen
);
3008 INIT_LIST_HEAD(&set
->bindings
);
3011 set
->klen
= desc
.klen
;
3013 set
->objtype
= objtype
;
3014 set
->dlen
= desc
.dlen
;
3016 set
->size
= desc
.size
;
3017 set
->policy
= policy
;
3020 set
->timeout
= timeout
;
3021 set
->gc_int
= gc_int
;
3023 err
= ops
->init(set
, &desc
, nla
);
3027 err
= nft_trans_set_add(&ctx
, NFT_MSG_NEWSET
, set
);
3031 list_add_tail_rcu(&set
->list
, &table
->sets
);
3040 module_put(ops
->owner
);
3044 static void nft_set_destroy(struct nft_set
*set
)
3046 set
->ops
->destroy(set
);
3047 module_put(set
->ops
->owner
);
3051 static void nf_tables_set_destroy(const struct nft_ctx
*ctx
, struct nft_set
*set
)
3053 list_del_rcu(&set
->list
);
3054 nf_tables_set_notify(ctx
, set
, NFT_MSG_DELSET
, GFP_ATOMIC
);
3055 nft_set_destroy(set
);
3058 static int nf_tables_delset(struct net
*net
, struct sock
*nlsk
,
3059 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
3060 const struct nlattr
* const nla
[])
3062 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
3063 u8 genmask
= nft_genmask_next(net
);
3064 struct nft_set
*set
;
3068 if (nfmsg
->nfgen_family
== NFPROTO_UNSPEC
)
3069 return -EAFNOSUPPORT
;
3070 if (nla
[NFTA_SET_TABLE
] == NULL
)
3073 err
= nft_ctx_init_from_setattr(&ctx
, net
, skb
, nlh
, nla
, genmask
);
3077 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_NAME
], genmask
);
3079 return PTR_ERR(set
);
3080 if (!list_empty(&set
->bindings
))
3083 return nft_delset(&ctx
, set
);
3086 static int nf_tables_bind_check_setelem(const struct nft_ctx
*ctx
,
3087 const struct nft_set
*set
,
3088 const struct nft_set_iter
*iter
,
3089 const struct nft_set_elem
*elem
)
3091 const struct nft_set_ext
*ext
= nft_set_elem_ext(set
, elem
->priv
);
3092 enum nft_registers dreg
;
3094 dreg
= nft_type_to_reg(set
->dtype
);
3095 return nft_validate_register_store(ctx
, dreg
, nft_set_ext_data(ext
),
3096 set
->dtype
== NFT_DATA_VERDICT
?
3097 NFT_DATA_VERDICT
: NFT_DATA_VALUE
,
3101 int nf_tables_bind_set(const struct nft_ctx
*ctx
, struct nft_set
*set
,
3102 struct nft_set_binding
*binding
)
3104 struct nft_set_binding
*i
;
3105 struct nft_set_iter iter
;
3107 if (!list_empty(&set
->bindings
) && set
->flags
& NFT_SET_ANONYMOUS
)
3110 if (binding
->flags
& NFT_SET_MAP
) {
3111 /* If the set is already bound to the same chain all
3112 * jumps are already validated for that chain.
3114 list_for_each_entry(i
, &set
->bindings
, list
) {
3115 if (i
->flags
& NFT_SET_MAP
&&
3116 i
->chain
== binding
->chain
)
3120 iter
.genmask
= nft_genmask_next(ctx
->net
);
3124 iter
.fn
= nf_tables_bind_check_setelem
;
3126 set
->ops
->walk(ctx
, set
, &iter
);
3131 binding
->chain
= ctx
->chain
;
3132 list_add_tail_rcu(&binding
->list
, &set
->bindings
);
3135 EXPORT_SYMBOL_GPL(nf_tables_bind_set
);
3137 void nf_tables_unbind_set(const struct nft_ctx
*ctx
, struct nft_set
*set
,
3138 struct nft_set_binding
*binding
)
3140 list_del_rcu(&binding
->list
);
3142 if (list_empty(&set
->bindings
) && set
->flags
& NFT_SET_ANONYMOUS
&&
3143 nft_is_active(ctx
->net
, set
))
3144 nf_tables_set_destroy(ctx
, set
);
3146 EXPORT_SYMBOL_GPL(nf_tables_unbind_set
);
3148 const struct nft_set_ext_type nft_set_ext_types
[] = {
3149 [NFT_SET_EXT_KEY
] = {
3150 .align
= __alignof__(u32
),
3152 [NFT_SET_EXT_DATA
] = {
3153 .align
= __alignof__(u32
),
3155 [NFT_SET_EXT_EXPR
] = {
3156 .align
= __alignof__(struct nft_expr
),
3158 [NFT_SET_EXT_OBJREF
] = {
3159 .len
= sizeof(struct nft_object
*),
3160 .align
= __alignof__(struct nft_object
*),
3162 [NFT_SET_EXT_FLAGS
] = {
3164 .align
= __alignof__(u8
),
3166 [NFT_SET_EXT_TIMEOUT
] = {
3168 .align
= __alignof__(u64
),
3170 [NFT_SET_EXT_EXPIRATION
] = {
3171 .len
= sizeof(unsigned long),
3172 .align
= __alignof__(unsigned long),
3174 [NFT_SET_EXT_USERDATA
] = {
3175 .len
= sizeof(struct nft_userdata
),
3176 .align
= __alignof__(struct nft_userdata
),
3179 EXPORT_SYMBOL_GPL(nft_set_ext_types
);
3185 static const struct nla_policy nft_set_elem_policy
[NFTA_SET_ELEM_MAX
+ 1] = {
3186 [NFTA_SET_ELEM_KEY
] = { .type
= NLA_NESTED
},
3187 [NFTA_SET_ELEM_DATA
] = { .type
= NLA_NESTED
},
3188 [NFTA_SET_ELEM_FLAGS
] = { .type
= NLA_U32
},
3189 [NFTA_SET_ELEM_TIMEOUT
] = { .type
= NLA_U64
},
3190 [NFTA_SET_ELEM_USERDATA
] = { .type
= NLA_BINARY
,
3191 .len
= NFT_USERDATA_MAXLEN
},
3194 static const struct nla_policy nft_set_elem_list_policy
[NFTA_SET_ELEM_LIST_MAX
+ 1] = {
3195 [NFTA_SET_ELEM_LIST_TABLE
] = { .type
= NLA_STRING
},
3196 [NFTA_SET_ELEM_LIST_SET
] = { .type
= NLA_STRING
},
3197 [NFTA_SET_ELEM_LIST_ELEMENTS
] = { .type
= NLA_NESTED
},
3198 [NFTA_SET_ELEM_LIST_SET_ID
] = { .type
= NLA_U32
},
3201 static int nft_ctx_init_from_elemattr(struct nft_ctx
*ctx
, struct net
*net
,
3202 const struct sk_buff
*skb
,
3203 const struct nlmsghdr
*nlh
,
3204 const struct nlattr
* const nla
[],
3207 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
3208 struct nft_af_info
*afi
;
3209 struct nft_table
*table
;
3211 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, false);
3213 return PTR_ERR(afi
);
3215 table
= nf_tables_table_lookup(afi
, nla
[NFTA_SET_ELEM_LIST_TABLE
],
3218 return PTR_ERR(table
);
3220 nft_ctx_init(ctx
, net
, skb
, nlh
, afi
, table
, NULL
, nla
);
3224 static int nf_tables_fill_setelem(struct sk_buff
*skb
,
3225 const struct nft_set
*set
,
3226 const struct nft_set_elem
*elem
)
3228 const struct nft_set_ext
*ext
= nft_set_elem_ext(set
, elem
->priv
);
3229 unsigned char *b
= skb_tail_pointer(skb
);
3230 struct nlattr
*nest
;
3232 nest
= nla_nest_start(skb
, NFTA_LIST_ELEM
);
3234 goto nla_put_failure
;
3236 if (nft_data_dump(skb
, NFTA_SET_ELEM_KEY
, nft_set_ext_key(ext
),
3237 NFT_DATA_VALUE
, set
->klen
) < 0)
3238 goto nla_put_failure
;
3240 if (nft_set_ext_exists(ext
, NFT_SET_EXT_DATA
) &&
3241 nft_data_dump(skb
, NFTA_SET_ELEM_DATA
, nft_set_ext_data(ext
),
3242 set
->dtype
== NFT_DATA_VERDICT
? NFT_DATA_VERDICT
: NFT_DATA_VALUE
,
3244 goto nla_put_failure
;
3246 if (nft_set_ext_exists(ext
, NFT_SET_EXT_EXPR
) &&
3247 nft_expr_dump(skb
, NFTA_SET_ELEM_EXPR
, nft_set_ext_expr(ext
)) < 0)
3248 goto nla_put_failure
;
3250 if (nft_set_ext_exists(ext
, NFT_SET_EXT_OBJREF
) &&
3251 nla_put_string(skb
, NFTA_SET_ELEM_OBJREF
,
3252 (*nft_set_ext_obj(ext
))->name
) < 0)
3253 goto nla_put_failure
;
3255 if (nft_set_ext_exists(ext
, NFT_SET_EXT_FLAGS
) &&
3256 nla_put_be32(skb
, NFTA_SET_ELEM_FLAGS
,
3257 htonl(*nft_set_ext_flags(ext
))))
3258 goto nla_put_failure
;
3260 if (nft_set_ext_exists(ext
, NFT_SET_EXT_TIMEOUT
) &&
3261 nla_put_be64(skb
, NFTA_SET_ELEM_TIMEOUT
,
3262 cpu_to_be64(jiffies_to_msecs(
3263 *nft_set_ext_timeout(ext
))),
3265 goto nla_put_failure
;
3267 if (nft_set_ext_exists(ext
, NFT_SET_EXT_EXPIRATION
)) {
3268 unsigned long expires
, now
= jiffies
;
3270 expires
= *nft_set_ext_expiration(ext
);
3271 if (time_before(now
, expires
))
3276 if (nla_put_be64(skb
, NFTA_SET_ELEM_EXPIRATION
,
3277 cpu_to_be64(jiffies_to_msecs(expires
)),
3279 goto nla_put_failure
;
3282 if (nft_set_ext_exists(ext
, NFT_SET_EXT_USERDATA
)) {
3283 struct nft_userdata
*udata
;
3285 udata
= nft_set_ext_userdata(ext
);
3286 if (nla_put(skb
, NFTA_SET_ELEM_USERDATA
,
3287 udata
->len
+ 1, udata
->data
))
3288 goto nla_put_failure
;
3291 nla_nest_end(skb
, nest
);
3299 struct nft_set_dump_args
{
3300 const struct netlink_callback
*cb
;
3301 struct nft_set_iter iter
;
3302 struct sk_buff
*skb
;
3305 static int nf_tables_dump_setelem(const struct nft_ctx
*ctx
,
3306 const struct nft_set
*set
,
3307 const struct nft_set_iter
*iter
,
3308 const struct nft_set_elem
*elem
)
3310 struct nft_set_dump_args
*args
;
3312 args
= container_of(iter
, struct nft_set_dump_args
, iter
);
3313 return nf_tables_fill_setelem(args
->skb
, set
, elem
);
3316 static int nf_tables_dump_set(struct sk_buff
*skb
, struct netlink_callback
*cb
)
3318 struct net
*net
= sock_net(skb
->sk
);
3319 u8 genmask
= nft_genmask_cur(net
);
3320 const struct nft_set
*set
;
3321 struct nft_set_dump_args args
;
3323 struct nlattr
*nla
[NFTA_SET_ELEM_LIST_MAX
+ 1];
3324 struct nfgenmsg
*nfmsg
;
3325 struct nlmsghdr
*nlh
;
3326 struct nlattr
*nest
;
3330 err
= nlmsg_parse(cb
->nlh
, sizeof(struct nfgenmsg
), nla
,
3331 NFTA_SET_ELEM_LIST_MAX
, nft_set_elem_list_policy
);
3335 err
= nft_ctx_init_from_elemattr(&ctx
, net
, cb
->skb
, cb
->nlh
,
3336 (void *)nla
, genmask
);
3340 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
],
3343 return PTR_ERR(set
);
3345 event
= NFT_MSG_NEWSETELEM
;
3346 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
3347 portid
= NETLINK_CB(cb
->skb
).portid
;
3348 seq
= cb
->nlh
->nlmsg_seq
;
3350 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
),
3353 goto nla_put_failure
;
3355 nfmsg
= nlmsg_data(nlh
);
3356 nfmsg
->nfgen_family
= ctx
.afi
->family
;
3357 nfmsg
->version
= NFNETLINK_V0
;
3358 nfmsg
->res_id
= htons(ctx
.net
->nft
.base_seq
& 0xffff);
3360 if (nla_put_string(skb
, NFTA_SET_ELEM_LIST_TABLE
, ctx
.table
->name
))
3361 goto nla_put_failure
;
3362 if (nla_put_string(skb
, NFTA_SET_ELEM_LIST_SET
, set
->name
))
3363 goto nla_put_failure
;
3365 nest
= nla_nest_start(skb
, NFTA_SET_ELEM_LIST_ELEMENTS
);
3367 goto nla_put_failure
;
3371 args
.iter
.genmask
= nft_genmask_cur(ctx
.net
);
3372 args
.iter
.skip
= cb
->args
[0];
3373 args
.iter
.count
= 0;
3375 args
.iter
.fn
= nf_tables_dump_setelem
;
3376 set
->ops
->walk(&ctx
, set
, &args
.iter
);
3378 nla_nest_end(skb
, nest
);
3379 nlmsg_end(skb
, nlh
);
3381 if (args
.iter
.err
&& args
.iter
.err
!= -EMSGSIZE
)
3382 return args
.iter
.err
;
3383 if (args
.iter
.count
== cb
->args
[0])
3386 cb
->args
[0] = args
.iter
.count
;
3393 static int nf_tables_getsetelem(struct net
*net
, struct sock
*nlsk
,
3394 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
3395 const struct nlattr
* const nla
[])
3397 u8 genmask
= nft_genmask_cur(net
);
3398 const struct nft_set
*set
;
3402 err
= nft_ctx_init_from_elemattr(&ctx
, net
, skb
, nlh
, nla
, genmask
);
3406 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
],
3409 return PTR_ERR(set
);
3411 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
3412 struct netlink_dump_control c
= {
3413 .dump
= nf_tables_dump_set
,
3415 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
3420 static int nf_tables_fill_setelem_info(struct sk_buff
*skb
,
3421 const struct nft_ctx
*ctx
, u32 seq
,
3422 u32 portid
, int event
, u16 flags
,
3423 const struct nft_set
*set
,
3424 const struct nft_set_elem
*elem
)
3426 struct nfgenmsg
*nfmsg
;
3427 struct nlmsghdr
*nlh
;
3428 struct nlattr
*nest
;
3431 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
3432 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
),
3435 goto nla_put_failure
;
3437 nfmsg
= nlmsg_data(nlh
);
3438 nfmsg
->nfgen_family
= ctx
->afi
->family
;
3439 nfmsg
->version
= NFNETLINK_V0
;
3440 nfmsg
->res_id
= htons(ctx
->net
->nft
.base_seq
& 0xffff);
3442 if (nla_put_string(skb
, NFTA_SET_TABLE
, ctx
->table
->name
))
3443 goto nla_put_failure
;
3444 if (nla_put_string(skb
, NFTA_SET_NAME
, set
->name
))
3445 goto nla_put_failure
;
3447 nest
= nla_nest_start(skb
, NFTA_SET_ELEM_LIST_ELEMENTS
);
3449 goto nla_put_failure
;
3451 err
= nf_tables_fill_setelem(skb
, set
, elem
);
3453 goto nla_put_failure
;
3455 nla_nest_end(skb
, nest
);
3457 nlmsg_end(skb
, nlh
);
3461 nlmsg_trim(skb
, nlh
);
3465 static int nf_tables_setelem_notify(const struct nft_ctx
*ctx
,
3466 const struct nft_set
*set
,
3467 const struct nft_set_elem
*elem
,
3468 int event
, u16 flags
)
3470 struct net
*net
= ctx
->net
;
3471 u32 portid
= ctx
->portid
;
3472 struct sk_buff
*skb
;
3475 if (!ctx
->report
&& !nfnetlink_has_listeners(net
, NFNLGRP_NFTABLES
))
3479 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
3483 err
= nf_tables_fill_setelem_info(skb
, ctx
, 0, portid
, event
, flags
,
3490 err
= nfnetlink_send(skb
, net
, portid
, NFNLGRP_NFTABLES
, ctx
->report
,
3494 nfnetlink_set_err(net
, portid
, NFNLGRP_NFTABLES
, err
);
3498 static struct nft_trans
*nft_trans_elem_alloc(struct nft_ctx
*ctx
,
3500 struct nft_set
*set
)
3502 struct nft_trans
*trans
;
3504 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_elem
));
3508 nft_trans_elem_set(trans
) = set
;
3512 void *nft_set_elem_init(const struct nft_set
*set
,
3513 const struct nft_set_ext_tmpl
*tmpl
,
3514 const u32
*key
, const u32
*data
,
3515 u64 timeout
, gfp_t gfp
)
3517 struct nft_set_ext
*ext
;
3520 elem
= kzalloc(set
->ops
->elemsize
+ tmpl
->len
, gfp
);
3524 ext
= nft_set_elem_ext(set
, elem
);
3525 nft_set_ext_init(ext
, tmpl
);
3527 memcpy(nft_set_ext_key(ext
), key
, set
->klen
);
3528 if (nft_set_ext_exists(ext
, NFT_SET_EXT_DATA
))
3529 memcpy(nft_set_ext_data(ext
), data
, set
->dlen
);
3530 if (nft_set_ext_exists(ext
, NFT_SET_EXT_EXPIRATION
))
3531 *nft_set_ext_expiration(ext
) =
3533 if (nft_set_ext_exists(ext
, NFT_SET_EXT_TIMEOUT
))
3534 *nft_set_ext_timeout(ext
) = timeout
;
3539 void nft_set_elem_destroy(const struct nft_set
*set
, void *elem
,
3542 struct nft_set_ext
*ext
= nft_set_elem_ext(set
, elem
);
3544 nft_data_uninit(nft_set_ext_key(ext
), NFT_DATA_VALUE
);
3545 if (nft_set_ext_exists(ext
, NFT_SET_EXT_DATA
))
3546 nft_data_uninit(nft_set_ext_data(ext
), set
->dtype
);
3547 if (destroy_expr
&& nft_set_ext_exists(ext
, NFT_SET_EXT_EXPR
))
3548 nf_tables_expr_destroy(NULL
, nft_set_ext_expr(ext
));
3549 if (nft_set_ext_exists(ext
, NFT_SET_EXT_OBJREF
))
3550 (*nft_set_ext_obj(ext
))->use
--;
3553 EXPORT_SYMBOL_GPL(nft_set_elem_destroy
);
3555 static int nft_setelem_parse_flags(const struct nft_set
*set
,
3556 const struct nlattr
*attr
, u32
*flags
)
3561 *flags
= ntohl(nla_get_be32(attr
));
3562 if (*flags
& ~NFT_SET_ELEM_INTERVAL_END
)
3564 if (!(set
->flags
& NFT_SET_INTERVAL
) &&
3565 *flags
& NFT_SET_ELEM_INTERVAL_END
)
3571 static int nft_add_set_elem(struct nft_ctx
*ctx
, struct nft_set
*set
,
3572 const struct nlattr
*attr
, u32 nlmsg_flags
)
3574 struct nlattr
*nla
[NFTA_SET_ELEM_MAX
+ 1];
3575 u8 genmask
= nft_genmask_next(ctx
->net
);
3576 struct nft_data_desc d1
, d2
;
3577 struct nft_set_ext_tmpl tmpl
;
3578 struct nft_set_ext
*ext
, *ext2
;
3579 struct nft_set_elem elem
;
3580 struct nft_set_binding
*binding
;
3581 struct nft_object
*obj
= NULL
;
3582 struct nft_userdata
*udata
;
3583 struct nft_data data
;
3584 enum nft_registers dreg
;
3585 struct nft_trans
*trans
;
3591 err
= nla_parse_nested(nla
, NFTA_SET_ELEM_MAX
, attr
,
3592 nft_set_elem_policy
);
3596 if (nla
[NFTA_SET_ELEM_KEY
] == NULL
)
3599 nft_set_ext_prepare(&tmpl
);
3601 err
= nft_setelem_parse_flags(set
, nla
[NFTA_SET_ELEM_FLAGS
], &flags
);
3605 nft_set_ext_add(&tmpl
, NFT_SET_EXT_FLAGS
);
3607 if (set
->flags
& NFT_SET_MAP
) {
3608 if (nla
[NFTA_SET_ELEM_DATA
] == NULL
&&
3609 !(flags
& NFT_SET_ELEM_INTERVAL_END
))
3611 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
&&
3612 flags
& NFT_SET_ELEM_INTERVAL_END
)
3615 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
)
3620 if (nla
[NFTA_SET_ELEM_TIMEOUT
] != NULL
) {
3621 if (!(set
->flags
& NFT_SET_TIMEOUT
))
3623 timeout
= msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3624 nla
[NFTA_SET_ELEM_TIMEOUT
])));
3625 } else if (set
->flags
& NFT_SET_TIMEOUT
) {
3626 timeout
= set
->timeout
;
3629 err
= nft_data_init(ctx
, &elem
.key
.val
, sizeof(elem
.key
), &d1
,
3630 nla
[NFTA_SET_ELEM_KEY
]);
3634 if (d1
.type
!= NFT_DATA_VALUE
|| d1
.len
!= set
->klen
)
3637 nft_set_ext_add_length(&tmpl
, NFT_SET_EXT_KEY
, d1
.len
);
3639 nft_set_ext_add(&tmpl
, NFT_SET_EXT_EXPIRATION
);
3640 if (timeout
!= set
->timeout
)
3641 nft_set_ext_add(&tmpl
, NFT_SET_EXT_TIMEOUT
);
3644 if (nla
[NFTA_SET_ELEM_OBJREF
] != NULL
) {
3645 if (!(set
->flags
& NFT_SET_OBJECT
)) {
3649 obj
= nf_tables_obj_lookup(ctx
->table
, nla
[NFTA_SET_ELEM_OBJREF
],
3650 set
->objtype
, genmask
);
3655 nft_set_ext_add(&tmpl
, NFT_SET_EXT_OBJREF
);
3658 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
) {
3659 err
= nft_data_init(ctx
, &data
, sizeof(data
), &d2
,
3660 nla
[NFTA_SET_ELEM_DATA
]);
3665 if (set
->dtype
!= NFT_DATA_VERDICT
&& d2
.len
!= set
->dlen
)
3668 dreg
= nft_type_to_reg(set
->dtype
);
3669 list_for_each_entry(binding
, &set
->bindings
, list
) {
3670 struct nft_ctx bind_ctx
= {
3673 .table
= ctx
->table
,
3674 .chain
= (struct nft_chain
*)binding
->chain
,
3677 if (!(binding
->flags
& NFT_SET_MAP
))
3680 err
= nft_validate_register_store(&bind_ctx
, dreg
,
3687 nft_set_ext_add_length(&tmpl
, NFT_SET_EXT_DATA
, d2
.len
);
3690 /* The full maximum length of userdata can exceed the maximum
3691 * offset value (U8_MAX) for following extensions, therefor it
3692 * must be the last extension added.
3695 if (nla
[NFTA_SET_ELEM_USERDATA
] != NULL
) {
3696 ulen
= nla_len(nla
[NFTA_SET_ELEM_USERDATA
]);
3698 nft_set_ext_add_length(&tmpl
, NFT_SET_EXT_USERDATA
,
3703 elem
.priv
= nft_set_elem_init(set
, &tmpl
, elem
.key
.val
.data
, data
.data
,
3704 timeout
, GFP_KERNEL
);
3705 if (elem
.priv
== NULL
)
3708 ext
= nft_set_elem_ext(set
, elem
.priv
);
3710 *nft_set_ext_flags(ext
) = flags
;
3712 udata
= nft_set_ext_userdata(ext
);
3713 udata
->len
= ulen
- 1;
3714 nla_memcpy(&udata
->data
, nla
[NFTA_SET_ELEM_USERDATA
], ulen
);
3717 *nft_set_ext_obj(ext
) = obj
;
3721 trans
= nft_trans_elem_alloc(ctx
, NFT_MSG_NEWSETELEM
, set
);
3725 ext
->genmask
= nft_genmask_cur(ctx
->net
) | NFT_SET_ELEM_BUSY_MASK
;
3726 err
= set
->ops
->insert(ctx
->net
, set
, &elem
, &ext2
);
3728 if (err
== -EEXIST
) {
3729 if ((nft_set_ext_exists(ext
, NFT_SET_EXT_DATA
) &&
3730 nft_set_ext_exists(ext2
, NFT_SET_EXT_DATA
) &&
3731 memcmp(nft_set_ext_data(ext
),
3732 nft_set_ext_data(ext2
), set
->dlen
) != 0) ||
3733 (nft_set_ext_exists(ext
, NFT_SET_EXT_OBJREF
) &&
3734 nft_set_ext_exists(ext2
, NFT_SET_EXT_OBJREF
) &&
3735 *nft_set_ext_obj(ext
) != *nft_set_ext_obj(ext2
)))
3737 else if (!(nlmsg_flags
& NLM_F_EXCL
))
3743 nft_trans_elem(trans
) = elem
;
3744 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
3752 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
)
3753 nft_data_uninit(&data
, d2
.type
);
3755 nft_data_uninit(&elem
.key
.val
, d1
.type
);
3760 static int nf_tables_newsetelem(struct net
*net
, struct sock
*nlsk
,
3761 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
3762 const struct nlattr
* const nla
[])
3764 u8 genmask
= nft_genmask_next(net
);
3765 const struct nlattr
*attr
;
3766 struct nft_set
*set
;
3770 if (nla
[NFTA_SET_ELEM_LIST_ELEMENTS
] == NULL
)
3773 err
= nft_ctx_init_from_elemattr(&ctx
, net
, skb
, nlh
, nla
, genmask
);
3777 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
],
3780 if (nla
[NFTA_SET_ELEM_LIST_SET_ID
]) {
3781 set
= nf_tables_set_lookup_byid(net
,
3782 nla
[NFTA_SET_ELEM_LIST_SET_ID
],
3786 return PTR_ERR(set
);
3789 if (!list_empty(&set
->bindings
) && set
->flags
& NFT_SET_CONSTANT
)
3792 nla_for_each_nested(attr
, nla
[NFTA_SET_ELEM_LIST_ELEMENTS
], rem
) {
3794 !atomic_add_unless(&set
->nelems
, 1, set
->size
+ set
->ndeact
))
3797 err
= nft_add_set_elem(&ctx
, set
, attr
, nlh
->nlmsg_flags
);
3799 atomic_dec(&set
->nelems
);
3806 static int nft_del_setelem(struct nft_ctx
*ctx
, struct nft_set
*set
,
3807 const struct nlattr
*attr
)
3809 struct nlattr
*nla
[NFTA_SET_ELEM_MAX
+ 1];
3810 struct nft_set_ext_tmpl tmpl
;
3811 struct nft_data_desc desc
;
3812 struct nft_set_elem elem
;
3813 struct nft_set_ext
*ext
;
3814 struct nft_trans
*trans
;
3819 err
= nla_parse_nested(nla
, NFTA_SET_ELEM_MAX
, attr
,
3820 nft_set_elem_policy
);
3825 if (nla
[NFTA_SET_ELEM_KEY
] == NULL
)
3828 nft_set_ext_prepare(&tmpl
);
3830 err
= nft_setelem_parse_flags(set
, nla
[NFTA_SET_ELEM_FLAGS
], &flags
);
3834 nft_set_ext_add(&tmpl
, NFT_SET_EXT_FLAGS
);
3836 err
= nft_data_init(ctx
, &elem
.key
.val
, sizeof(elem
.key
), &desc
,
3837 nla
[NFTA_SET_ELEM_KEY
]);
3842 if (desc
.type
!= NFT_DATA_VALUE
|| desc
.len
!= set
->klen
)
3845 nft_set_ext_add_length(&tmpl
, NFT_SET_EXT_KEY
, desc
.len
);
3848 elem
.priv
= nft_set_elem_init(set
, &tmpl
, elem
.key
.val
.data
, NULL
, 0,
3850 if (elem
.priv
== NULL
)
3853 ext
= nft_set_elem_ext(set
, elem
.priv
);
3855 *nft_set_ext_flags(ext
) = flags
;
3857 trans
= nft_trans_elem_alloc(ctx
, NFT_MSG_DELSETELEM
, set
);
3858 if (trans
== NULL
) {
3863 priv
= set
->ops
->deactivate(ctx
->net
, set
, &elem
);
3871 nft_trans_elem(trans
) = elem
;
3872 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
3880 nft_data_uninit(&elem
.key
.val
, desc
.type
);
3885 static int nft_flush_set(const struct nft_ctx
*ctx
,
3886 const struct nft_set
*set
,
3887 const struct nft_set_iter
*iter
,
3888 const struct nft_set_elem
*elem
)
3890 struct nft_trans
*trans
;
3893 trans
= nft_trans_alloc_gfp(ctx
, NFT_MSG_DELSETELEM
,
3894 sizeof(struct nft_trans_elem
), GFP_ATOMIC
);
3898 if (!set
->ops
->deactivate_one(ctx
->net
, set
, elem
->priv
)) {
3903 nft_trans_elem_set(trans
) = (struct nft_set
*)set
;
3904 nft_trans_elem(trans
) = *((struct nft_set_elem
*)elem
);
3905 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
3913 static int nf_tables_delsetelem(struct net
*net
, struct sock
*nlsk
,
3914 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
3915 const struct nlattr
* const nla
[])
3917 u8 genmask
= nft_genmask_next(net
);
3918 const struct nlattr
*attr
;
3919 struct nft_set
*set
;
3923 err
= nft_ctx_init_from_elemattr(&ctx
, net
, skb
, nlh
, nla
, genmask
);
3927 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
],
3930 return PTR_ERR(set
);
3931 if (!list_empty(&set
->bindings
) && set
->flags
& NFT_SET_CONSTANT
)
3934 if (nla
[NFTA_SET_ELEM_LIST_ELEMENTS
] == NULL
) {
3935 struct nft_set_dump_args args
= {
3938 .fn
= nft_flush_set
,
3941 set
->ops
->walk(&ctx
, set
, &args
.iter
);
3943 return args
.iter
.err
;
3946 nla_for_each_nested(attr
, nla
[NFTA_SET_ELEM_LIST_ELEMENTS
], rem
) {
3947 err
= nft_del_setelem(&ctx
, set
, attr
);
3956 void nft_set_gc_batch_release(struct rcu_head
*rcu
)
3958 struct nft_set_gc_batch
*gcb
;
3961 gcb
= container_of(rcu
, struct nft_set_gc_batch
, head
.rcu
);
3962 for (i
= 0; i
< gcb
->head
.cnt
; i
++)
3963 nft_set_elem_destroy(gcb
->head
.set
, gcb
->elems
[i
], true);
3966 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release
);
3968 struct nft_set_gc_batch
*nft_set_gc_batch_alloc(const struct nft_set
*set
,
3971 struct nft_set_gc_batch
*gcb
;
3973 gcb
= kzalloc(sizeof(*gcb
), gfp
);
3976 gcb
->head
.set
= set
;
3979 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc
);
3986 * nft_register_obj- register nf_tables stateful object type
3989 * Registers the object type for use with nf_tables. Returns zero on
3990 * success or a negative errno code otherwise.
3992 int nft_register_obj(struct nft_object_type
*obj_type
)
3994 if (obj_type
->type
== NFT_OBJECT_UNSPEC
)
3997 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
3998 list_add_rcu(&obj_type
->list
, &nf_tables_objects
);
3999 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
4002 EXPORT_SYMBOL_GPL(nft_register_obj
);
4005 * nft_unregister_obj - unregister nf_tables object type
4008 * Unregisters the object type for use with nf_tables.
4010 void nft_unregister_obj(struct nft_object_type
*obj_type
)
4012 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
4013 list_del_rcu(&obj_type
->list
);
4014 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
4016 EXPORT_SYMBOL_GPL(nft_unregister_obj
);
4018 struct nft_object
*nf_tables_obj_lookup(const struct nft_table
*table
,
4019 const struct nlattr
*nla
,
4020 u32 objtype
, u8 genmask
)
4022 struct nft_object
*obj
;
4024 list_for_each_entry(obj
, &table
->objects
, list
) {
4025 if (!nla_strcmp(nla
, obj
->name
) &&
4026 objtype
== obj
->type
->type
&&
4027 nft_active_genmask(obj
, genmask
))
4030 return ERR_PTR(-ENOENT
);
4032 EXPORT_SYMBOL_GPL(nf_tables_obj_lookup
);
4034 static const struct nla_policy nft_obj_policy
[NFTA_OBJ_MAX
+ 1] = {
4035 [NFTA_OBJ_TABLE
] = { .type
= NLA_STRING
},
4036 [NFTA_OBJ_NAME
] = { .type
= NLA_STRING
},
4037 [NFTA_OBJ_TYPE
] = { .type
= NLA_U32
},
4038 [NFTA_OBJ_DATA
] = { .type
= NLA_NESTED
},
4041 static struct nft_object
*nft_obj_init(const struct nft_object_type
*type
,
4042 const struct nlattr
*attr
)
4044 struct nlattr
*tb
[type
->maxattr
+ 1];
4045 struct nft_object
*obj
;
4049 err
= nla_parse_nested(tb
, type
->maxattr
, attr
, type
->policy
);
4053 memset(tb
, 0, sizeof(tb
[0]) * (type
->maxattr
+ 1));
4057 obj
= kzalloc(sizeof(struct nft_object
) + type
->size
, GFP_KERNEL
);
4061 err
= type
->init((const struct nlattr
* const *)tb
, obj
);
4070 return ERR_PTR(err
);
4073 static int nft_object_dump(struct sk_buff
*skb
, unsigned int attr
,
4074 struct nft_object
*obj
, bool reset
)
4076 struct nlattr
*nest
;
4078 nest
= nla_nest_start(skb
, attr
);
4080 goto nla_put_failure
;
4081 if (obj
->type
->dump(skb
, obj
, reset
) < 0)
4082 goto nla_put_failure
;
4083 nla_nest_end(skb
, nest
);
4090 static const struct nft_object_type
*__nft_obj_type_get(u32 objtype
)
4092 const struct nft_object_type
*type
;
4094 list_for_each_entry(type
, &nf_tables_objects
, list
) {
4095 if (objtype
== type
->type
)
4101 static const struct nft_object_type
*nft_obj_type_get(u32 objtype
)
4103 const struct nft_object_type
*type
;
4105 type
= __nft_obj_type_get(objtype
);
4106 if (type
!= NULL
&& try_module_get(type
->owner
))
4109 #ifdef CONFIG_MODULES
4111 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
4112 request_module("nft-obj-%u", objtype
);
4113 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
4114 if (__nft_obj_type_get(objtype
))
4115 return ERR_PTR(-EAGAIN
);
4118 return ERR_PTR(-ENOENT
);
4121 static int nf_tables_newobj(struct net
*net
, struct sock
*nlsk
,
4122 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
4123 const struct nlattr
* const nla
[])
4125 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
4126 const struct nft_object_type
*type
;
4127 u8 genmask
= nft_genmask_next(net
);
4128 int family
= nfmsg
->nfgen_family
;
4129 struct nft_af_info
*afi
;
4130 struct nft_table
*table
;
4131 struct nft_object
*obj
;
4136 if (!nla
[NFTA_OBJ_TYPE
] ||
4137 !nla
[NFTA_OBJ_NAME
] ||
4138 !nla
[NFTA_OBJ_DATA
])
4141 afi
= nf_tables_afinfo_lookup(net
, family
, true);
4143 return PTR_ERR(afi
);
4145 table
= nf_tables_table_lookup(afi
, nla
[NFTA_OBJ_TABLE
], genmask
);
4147 return PTR_ERR(table
);
4149 objtype
= ntohl(nla_get_be32(nla
[NFTA_OBJ_TYPE
]));
4150 obj
= nf_tables_obj_lookup(table
, nla
[NFTA_OBJ_NAME
], objtype
, genmask
);
4160 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
4166 nft_ctx_init(&ctx
, net
, skb
, nlh
, afi
, table
, NULL
, nla
);
4168 type
= nft_obj_type_get(objtype
);
4170 return PTR_ERR(type
);
4172 obj
= nft_obj_init(type
, nla
[NFTA_OBJ_DATA
]);
4178 nla_strlcpy(obj
->name
, nla
[NFTA_OBJ_NAME
], NFT_OBJ_MAXNAMELEN
);
4180 err
= nft_trans_obj_add(&ctx
, NFT_MSG_NEWOBJ
, obj
);
4184 list_add_tail_rcu(&obj
->list
, &table
->objects
);
4188 if (obj
->type
->destroy
)
4189 obj
->type
->destroy(obj
);
4192 module_put(type
->owner
);
4196 static int nf_tables_fill_obj_info(struct sk_buff
*skb
, struct net
*net
,
4197 u32 portid
, u32 seq
, int event
, u32 flags
,
4198 int family
, const struct nft_table
*table
,
4199 struct nft_object
*obj
, bool reset
)
4201 struct nfgenmsg
*nfmsg
;
4202 struct nlmsghdr
*nlh
;
4204 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
4205 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
), flags
);
4207 goto nla_put_failure
;
4209 nfmsg
= nlmsg_data(nlh
);
4210 nfmsg
->nfgen_family
= family
;
4211 nfmsg
->version
= NFNETLINK_V0
;
4212 nfmsg
->res_id
= htons(net
->nft
.base_seq
& 0xffff);
4214 if (nla_put_string(skb
, NFTA_OBJ_TABLE
, table
->name
) ||
4215 nla_put_string(skb
, NFTA_OBJ_NAME
, obj
->name
) ||
4216 nla_put_be32(skb
, NFTA_OBJ_TYPE
, htonl(obj
->type
->type
)) ||
4217 nla_put_be32(skb
, NFTA_OBJ_USE
, htonl(obj
->use
)) ||
4218 nft_object_dump(skb
, NFTA_OBJ_DATA
, obj
, reset
))
4219 goto nla_put_failure
;
4221 nlmsg_end(skb
, nlh
);
4225 nlmsg_trim(skb
, nlh
);
4229 struct nft_obj_filter
{
4230 char table
[NFT_OBJ_MAXNAMELEN
];
4234 static int nf_tables_dump_obj(struct sk_buff
*skb
, struct netlink_callback
*cb
)
4236 const struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
4237 const struct nft_af_info
*afi
;
4238 const struct nft_table
*table
;
4239 unsigned int idx
= 0, s_idx
= cb
->args
[0];
4240 struct nft_obj_filter
*filter
= cb
->data
;
4241 struct net
*net
= sock_net(skb
->sk
);
4242 int family
= nfmsg
->nfgen_family
;
4243 struct nft_object
*obj
;
4246 if (NFNL_MSG_TYPE(cb
->nlh
->nlmsg_type
) == NFT_MSG_GETOBJ_RESET
)
4250 cb
->seq
= net
->nft
.base_seq
;
4252 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
4253 if (family
!= NFPROTO_UNSPEC
&& family
!= afi
->family
)
4256 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
4257 list_for_each_entry_rcu(obj
, &table
->objects
, list
) {
4258 if (!nft_is_active(net
, obj
))
4263 memset(&cb
->args
[1], 0,
4264 sizeof(cb
->args
) - sizeof(cb
->args
[0]));
4265 if (filter
->table
[0] &&
4266 strcmp(filter
->table
, table
->name
))
4268 if (filter
->type
!= NFT_OBJECT_UNSPEC
&&
4269 obj
->type
->type
!= filter
->type
)
4272 if (nf_tables_fill_obj_info(skb
, net
, NETLINK_CB(cb
->skb
).portid
,
4275 NLM_F_MULTI
| NLM_F_APPEND
,
4276 afi
->family
, table
, obj
, reset
) < 0)
4279 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
4292 static int nf_tables_dump_obj_done(struct netlink_callback
*cb
)
4299 static struct nft_obj_filter
*
4300 nft_obj_filter_alloc(const struct nlattr
* const nla
[])
4302 struct nft_obj_filter
*filter
;
4304 filter
= kzalloc(sizeof(*filter
), GFP_KERNEL
);
4306 return ERR_PTR(-ENOMEM
);
4308 if (nla
[NFTA_OBJ_TABLE
])
4309 nla_strlcpy(filter
->table
, nla
[NFTA_OBJ_TABLE
],
4310 NFT_TABLE_MAXNAMELEN
);
4311 if (nla
[NFTA_OBJ_TYPE
])
4312 filter
->type
= ntohl(nla_get_be32(nla
[NFTA_OBJ_TYPE
]));
4317 static int nf_tables_getobj(struct net
*net
, struct sock
*nlsk
,
4318 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
4319 const struct nlattr
* const nla
[])
4321 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
4322 u8 genmask
= nft_genmask_cur(net
);
4323 int family
= nfmsg
->nfgen_family
;
4324 const struct nft_af_info
*afi
;
4325 const struct nft_table
*table
;
4326 struct nft_object
*obj
;
4327 struct sk_buff
*skb2
;
4332 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
4333 struct netlink_dump_control c
= {
4334 .dump
= nf_tables_dump_obj
,
4335 .done
= nf_tables_dump_obj_done
,
4338 if (nla
[NFTA_OBJ_TABLE
] ||
4339 nla
[NFTA_OBJ_TYPE
]) {
4340 struct nft_obj_filter
*filter
;
4342 filter
= nft_obj_filter_alloc(nla
);
4348 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
4351 if (!nla
[NFTA_OBJ_NAME
] ||
4352 !nla
[NFTA_OBJ_TYPE
])
4355 afi
= nf_tables_afinfo_lookup(net
, family
, false);
4357 return PTR_ERR(afi
);
4359 table
= nf_tables_table_lookup(afi
, nla
[NFTA_OBJ_TABLE
], genmask
);
4361 return PTR_ERR(table
);
4363 objtype
= ntohl(nla_get_be32(nla
[NFTA_OBJ_TYPE
]));
4364 obj
= nf_tables_obj_lookup(table
, nla
[NFTA_OBJ_NAME
], objtype
, genmask
);
4366 return PTR_ERR(obj
);
4368 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
4372 if (NFNL_MSG_TYPE(nlh
->nlmsg_type
) == NFT_MSG_GETOBJ_RESET
)
4375 err
= nf_tables_fill_obj_info(skb2
, net
, NETLINK_CB(skb
).portid
,
4376 nlh
->nlmsg_seq
, NFT_MSG_NEWOBJ
, 0,
4377 family
, table
, obj
, reset
);
4381 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
4389 static void nft_obj_destroy(struct nft_object
*obj
)
4391 if (obj
->type
->destroy
)
4392 obj
->type
->destroy(obj
);
4394 module_put(obj
->type
->owner
);
4398 static int nf_tables_delobj(struct net
*net
, struct sock
*nlsk
,
4399 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
4400 const struct nlattr
* const nla
[])
4402 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
4403 u8 genmask
= nft_genmask_next(net
);
4404 int family
= nfmsg
->nfgen_family
;
4405 struct nft_af_info
*afi
;
4406 struct nft_table
*table
;
4407 struct nft_object
*obj
;
4411 if (!nla
[NFTA_OBJ_TYPE
] ||
4412 !nla
[NFTA_OBJ_NAME
])
4415 afi
= nf_tables_afinfo_lookup(net
, family
, true);
4417 return PTR_ERR(afi
);
4419 table
= nf_tables_table_lookup(afi
, nla
[NFTA_OBJ_TABLE
], genmask
);
4421 return PTR_ERR(table
);
4423 objtype
= ntohl(nla_get_be32(nla
[NFTA_OBJ_TYPE
]));
4424 obj
= nf_tables_obj_lookup(table
, nla
[NFTA_OBJ_NAME
], objtype
, genmask
);
4426 return PTR_ERR(obj
);
4430 nft_ctx_init(&ctx
, net
, skb
, nlh
, afi
, table
, NULL
, nla
);
4432 return nft_delobj(&ctx
, obj
);
4435 int nft_obj_notify(struct net
*net
, struct nft_table
*table
,
4436 struct nft_object
*obj
, u32 portid
, u32 seq
, int event
,
4437 int family
, int report
, gfp_t gfp
)
4439 struct sk_buff
*skb
;
4443 !nfnetlink_has_listeners(net
, NFNLGRP_NFTABLES
))
4447 skb
= nlmsg_new(NLMSG_GOODSIZE
, gfp
);
4451 err
= nf_tables_fill_obj_info(skb
, net
, portid
, seq
, event
, 0, family
,
4458 err
= nfnetlink_send(skb
, net
, portid
, NFNLGRP_NFTABLES
, report
, gfp
);
4461 nfnetlink_set_err(net
, portid
, NFNLGRP_NFTABLES
, err
);
4465 EXPORT_SYMBOL_GPL(nft_obj_notify
);
4467 static int nf_tables_obj_notify(const struct nft_ctx
*ctx
,
4468 struct nft_object
*obj
, int event
)
4470 return nft_obj_notify(ctx
->net
, ctx
->table
, obj
, ctx
->portid
,
4471 ctx
->seq
, event
, ctx
->afi
->family
, ctx
->report
,
4475 static int nf_tables_fill_gen_info(struct sk_buff
*skb
, struct net
*net
,
4476 u32 portid
, u32 seq
)
4478 struct nlmsghdr
*nlh
;
4479 struct nfgenmsg
*nfmsg
;
4480 int event
= (NFNL_SUBSYS_NFTABLES
<< 8) | NFT_MSG_NEWGEN
;
4482 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
), 0);
4484 goto nla_put_failure
;
4486 nfmsg
= nlmsg_data(nlh
);
4487 nfmsg
->nfgen_family
= AF_UNSPEC
;
4488 nfmsg
->version
= NFNETLINK_V0
;
4489 nfmsg
->res_id
= htons(net
->nft
.base_seq
& 0xffff);
4491 if (nla_put_be32(skb
, NFTA_GEN_ID
, htonl(net
->nft
.base_seq
)))
4492 goto nla_put_failure
;
4494 nlmsg_end(skb
, nlh
);
4498 nlmsg_trim(skb
, nlh
);
4502 static int nf_tables_gen_notify(struct net
*net
, struct sk_buff
*skb
, int event
)
4504 struct nlmsghdr
*nlh
= nlmsg_hdr(skb
);
4505 struct sk_buff
*skb2
;
4508 if (nlmsg_report(nlh
) &&
4509 !nfnetlink_has_listeners(net
, NFNLGRP_NFTABLES
))
4513 skb2
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
4517 err
= nf_tables_fill_gen_info(skb2
, net
, NETLINK_CB(skb
).portid
,
4524 err
= nfnetlink_send(skb2
, net
, NETLINK_CB(skb
).portid
,
4525 NFNLGRP_NFTABLES
, nlmsg_report(nlh
), GFP_KERNEL
);
4528 nfnetlink_set_err(net
, NETLINK_CB(skb
).portid
, NFNLGRP_NFTABLES
,
4534 static int nf_tables_getgen(struct net
*net
, struct sock
*nlsk
,
4535 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
4536 const struct nlattr
* const nla
[])
4538 struct sk_buff
*skb2
;
4541 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
4545 err
= nf_tables_fill_gen_info(skb2
, net
, NETLINK_CB(skb
).portid
,
4550 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
4556 static const struct nfnl_callback nf_tables_cb
[NFT_MSG_MAX
] = {
4557 [NFT_MSG_NEWTABLE
] = {
4558 .call_batch
= nf_tables_newtable
,
4559 .attr_count
= NFTA_TABLE_MAX
,
4560 .policy
= nft_table_policy
,
4562 [NFT_MSG_GETTABLE
] = {
4563 .call
= nf_tables_gettable
,
4564 .attr_count
= NFTA_TABLE_MAX
,
4565 .policy
= nft_table_policy
,
4567 [NFT_MSG_DELTABLE
] = {
4568 .call_batch
= nf_tables_deltable
,
4569 .attr_count
= NFTA_TABLE_MAX
,
4570 .policy
= nft_table_policy
,
4572 [NFT_MSG_NEWCHAIN
] = {
4573 .call_batch
= nf_tables_newchain
,
4574 .attr_count
= NFTA_CHAIN_MAX
,
4575 .policy
= nft_chain_policy
,
4577 [NFT_MSG_GETCHAIN
] = {
4578 .call
= nf_tables_getchain
,
4579 .attr_count
= NFTA_CHAIN_MAX
,
4580 .policy
= nft_chain_policy
,
4582 [NFT_MSG_DELCHAIN
] = {
4583 .call_batch
= nf_tables_delchain
,
4584 .attr_count
= NFTA_CHAIN_MAX
,
4585 .policy
= nft_chain_policy
,
4587 [NFT_MSG_NEWRULE
] = {
4588 .call_batch
= nf_tables_newrule
,
4589 .attr_count
= NFTA_RULE_MAX
,
4590 .policy
= nft_rule_policy
,
4592 [NFT_MSG_GETRULE
] = {
4593 .call
= nf_tables_getrule
,
4594 .attr_count
= NFTA_RULE_MAX
,
4595 .policy
= nft_rule_policy
,
4597 [NFT_MSG_DELRULE
] = {
4598 .call_batch
= nf_tables_delrule
,
4599 .attr_count
= NFTA_RULE_MAX
,
4600 .policy
= nft_rule_policy
,
4602 [NFT_MSG_NEWSET
] = {
4603 .call_batch
= nf_tables_newset
,
4604 .attr_count
= NFTA_SET_MAX
,
4605 .policy
= nft_set_policy
,
4607 [NFT_MSG_GETSET
] = {
4608 .call
= nf_tables_getset
,
4609 .attr_count
= NFTA_SET_MAX
,
4610 .policy
= nft_set_policy
,
4612 [NFT_MSG_DELSET
] = {
4613 .call_batch
= nf_tables_delset
,
4614 .attr_count
= NFTA_SET_MAX
,
4615 .policy
= nft_set_policy
,
4617 [NFT_MSG_NEWSETELEM
] = {
4618 .call_batch
= nf_tables_newsetelem
,
4619 .attr_count
= NFTA_SET_ELEM_LIST_MAX
,
4620 .policy
= nft_set_elem_list_policy
,
4622 [NFT_MSG_GETSETELEM
] = {
4623 .call
= nf_tables_getsetelem
,
4624 .attr_count
= NFTA_SET_ELEM_LIST_MAX
,
4625 .policy
= nft_set_elem_list_policy
,
4627 [NFT_MSG_DELSETELEM
] = {
4628 .call_batch
= nf_tables_delsetelem
,
4629 .attr_count
= NFTA_SET_ELEM_LIST_MAX
,
4630 .policy
= nft_set_elem_list_policy
,
4632 [NFT_MSG_GETGEN
] = {
4633 .call
= nf_tables_getgen
,
4635 [NFT_MSG_NEWOBJ
] = {
4636 .call_batch
= nf_tables_newobj
,
4637 .attr_count
= NFTA_OBJ_MAX
,
4638 .policy
= nft_obj_policy
,
4640 [NFT_MSG_GETOBJ
] = {
4641 .call
= nf_tables_getobj
,
4642 .attr_count
= NFTA_OBJ_MAX
,
4643 .policy
= nft_obj_policy
,
4645 [NFT_MSG_DELOBJ
] = {
4646 .call_batch
= nf_tables_delobj
,
4647 .attr_count
= NFTA_OBJ_MAX
,
4648 .policy
= nft_obj_policy
,
4650 [NFT_MSG_GETOBJ_RESET
] = {
4651 .call
= nf_tables_getobj
,
4652 .attr_count
= NFTA_OBJ_MAX
,
4653 .policy
= nft_obj_policy
,
4657 static void nft_chain_commit_update(struct nft_trans
*trans
)
4659 struct nft_base_chain
*basechain
;
4661 if (nft_trans_chain_name(trans
)[0])
4662 strcpy(trans
->ctx
.chain
->name
, nft_trans_chain_name(trans
));
4664 if (!(trans
->ctx
.chain
->flags
& NFT_BASE_CHAIN
))
4667 basechain
= nft_base_chain(trans
->ctx
.chain
);
4668 nft_chain_stats_replace(basechain
, nft_trans_chain_stats(trans
));
4670 switch (nft_trans_chain_policy(trans
)) {
4673 basechain
->policy
= nft_trans_chain_policy(trans
);
4678 static void nf_tables_commit_release(struct nft_trans
*trans
)
4680 switch (trans
->msg_type
) {
4681 case NFT_MSG_DELTABLE
:
4682 nf_tables_table_destroy(&trans
->ctx
);
4684 case NFT_MSG_DELCHAIN
:
4685 nf_tables_chain_destroy(trans
->ctx
.chain
);
4687 case NFT_MSG_DELRULE
:
4688 nf_tables_rule_destroy(&trans
->ctx
, nft_trans_rule(trans
));
4690 case NFT_MSG_DELSET
:
4691 nft_set_destroy(nft_trans_set(trans
));
4693 case NFT_MSG_DELSETELEM
:
4694 nft_set_elem_destroy(nft_trans_elem_set(trans
),
4695 nft_trans_elem(trans
).priv
, true);
4697 case NFT_MSG_DELOBJ
:
4698 nft_obj_destroy(nft_trans_obj(trans
));
4704 static int nf_tables_commit(struct net
*net
, struct sk_buff
*skb
)
4706 struct nft_trans
*trans
, *next
;
4707 struct nft_trans_elem
*te
;
4709 /* Bump generation counter, invalidate any dump in progress */
4710 while (++net
->nft
.base_seq
== 0);
4712 /* A new generation has just started */
4713 net
->nft
.gencursor
= nft_gencursor_next(net
);
4715 /* Make sure all packets have left the previous generation before
4716 * purging old rules.
4720 list_for_each_entry_safe(trans
, next
, &net
->nft
.commit_list
, list
) {
4721 switch (trans
->msg_type
) {
4722 case NFT_MSG_NEWTABLE
:
4723 if (nft_trans_table_update(trans
)) {
4724 if (!nft_trans_table_enable(trans
)) {
4725 nf_tables_table_disable(net
,
4728 trans
->ctx
.table
->flags
|= NFT_TABLE_F_DORMANT
;
4731 nft_clear(net
, trans
->ctx
.table
);
4733 nf_tables_table_notify(&trans
->ctx
, NFT_MSG_NEWTABLE
);
4734 nft_trans_destroy(trans
);
4736 case NFT_MSG_DELTABLE
:
4737 list_del_rcu(&trans
->ctx
.table
->list
);
4738 nf_tables_table_notify(&trans
->ctx
, NFT_MSG_DELTABLE
);
4740 case NFT_MSG_NEWCHAIN
:
4741 if (nft_trans_chain_update(trans
))
4742 nft_chain_commit_update(trans
);
4744 nft_clear(net
, trans
->ctx
.chain
);
4746 nf_tables_chain_notify(&trans
->ctx
, NFT_MSG_NEWCHAIN
);
4747 nft_trans_destroy(trans
);
4749 case NFT_MSG_DELCHAIN
:
4750 list_del_rcu(&trans
->ctx
.chain
->list
);
4751 nf_tables_chain_notify(&trans
->ctx
, NFT_MSG_DELCHAIN
);
4752 nf_tables_unregister_hooks(trans
->ctx
.net
,
4755 trans
->ctx
.afi
->nops
);
4757 case NFT_MSG_NEWRULE
:
4758 nft_clear(trans
->ctx
.net
, nft_trans_rule(trans
));
4759 nf_tables_rule_notify(&trans
->ctx
,
4760 nft_trans_rule(trans
),
4762 nft_trans_destroy(trans
);
4764 case NFT_MSG_DELRULE
:
4765 list_del_rcu(&nft_trans_rule(trans
)->list
);
4766 nf_tables_rule_notify(&trans
->ctx
,
4767 nft_trans_rule(trans
),
4770 case NFT_MSG_NEWSET
:
4771 nft_clear(net
, nft_trans_set(trans
));
4772 /* This avoids hitting -EBUSY when deleting the table
4773 * from the transaction.
4775 if (nft_trans_set(trans
)->flags
& NFT_SET_ANONYMOUS
&&
4776 !list_empty(&nft_trans_set(trans
)->bindings
))
4777 trans
->ctx
.table
->use
--;
4779 nf_tables_set_notify(&trans
->ctx
, nft_trans_set(trans
),
4780 NFT_MSG_NEWSET
, GFP_KERNEL
);
4781 nft_trans_destroy(trans
);
4783 case NFT_MSG_DELSET
:
4784 list_del_rcu(&nft_trans_set(trans
)->list
);
4785 nf_tables_set_notify(&trans
->ctx
, nft_trans_set(trans
),
4786 NFT_MSG_DELSET
, GFP_KERNEL
);
4788 case NFT_MSG_NEWSETELEM
:
4789 te
= (struct nft_trans_elem
*)trans
->data
;
4791 te
->set
->ops
->activate(net
, te
->set
, &te
->elem
);
4792 nf_tables_setelem_notify(&trans
->ctx
, te
->set
,
4794 NFT_MSG_NEWSETELEM
, 0);
4795 nft_trans_destroy(trans
);
4797 case NFT_MSG_DELSETELEM
:
4798 te
= (struct nft_trans_elem
*)trans
->data
;
4800 nf_tables_setelem_notify(&trans
->ctx
, te
->set
,
4802 NFT_MSG_DELSETELEM
, 0);
4803 te
->set
->ops
->remove(te
->set
, &te
->elem
);
4804 atomic_dec(&te
->set
->nelems
);
4807 case NFT_MSG_NEWOBJ
:
4808 nft_clear(net
, nft_trans_obj(trans
));
4809 nf_tables_obj_notify(&trans
->ctx
, nft_trans_obj(trans
),
4811 nft_trans_destroy(trans
);
4813 case NFT_MSG_DELOBJ
:
4814 list_del_rcu(&nft_trans_obj(trans
)->list
);
4815 nf_tables_obj_notify(&trans
->ctx
, nft_trans_obj(trans
),
4823 list_for_each_entry_safe(trans
, next
, &net
->nft
.commit_list
, list
) {
4824 list_del(&trans
->list
);
4825 nf_tables_commit_release(trans
);
4828 nf_tables_gen_notify(net
, skb
, NFT_MSG_NEWGEN
);
4833 static void nf_tables_abort_release(struct nft_trans
*trans
)
4835 switch (trans
->msg_type
) {
4836 case NFT_MSG_NEWTABLE
:
4837 nf_tables_table_destroy(&trans
->ctx
);
4839 case NFT_MSG_NEWCHAIN
:
4840 nf_tables_chain_destroy(trans
->ctx
.chain
);
4842 case NFT_MSG_NEWRULE
:
4843 nf_tables_rule_destroy(&trans
->ctx
, nft_trans_rule(trans
));
4845 case NFT_MSG_NEWSET
:
4846 nft_set_destroy(nft_trans_set(trans
));
4848 case NFT_MSG_NEWSETELEM
:
4849 nft_set_elem_destroy(nft_trans_elem_set(trans
),
4850 nft_trans_elem(trans
).priv
, true);
4852 case NFT_MSG_NEWOBJ
:
4853 nft_obj_destroy(nft_trans_obj(trans
));
4859 static int nf_tables_abort(struct net
*net
, struct sk_buff
*skb
)
4861 struct nft_trans
*trans
, *next
;
4862 struct nft_trans_elem
*te
;
4864 list_for_each_entry_safe_reverse(trans
, next
, &net
->nft
.commit_list
,
4866 switch (trans
->msg_type
) {
4867 case NFT_MSG_NEWTABLE
:
4868 if (nft_trans_table_update(trans
)) {
4869 if (nft_trans_table_enable(trans
)) {
4870 nf_tables_table_disable(net
,
4873 trans
->ctx
.table
->flags
|= NFT_TABLE_F_DORMANT
;
4875 nft_trans_destroy(trans
);
4877 list_del_rcu(&trans
->ctx
.table
->list
);
4880 case NFT_MSG_DELTABLE
:
4881 nft_clear(trans
->ctx
.net
, trans
->ctx
.table
);
4882 nft_trans_destroy(trans
);
4884 case NFT_MSG_NEWCHAIN
:
4885 if (nft_trans_chain_update(trans
)) {
4886 free_percpu(nft_trans_chain_stats(trans
));
4888 nft_trans_destroy(trans
);
4890 trans
->ctx
.table
->use
--;
4891 list_del_rcu(&trans
->ctx
.chain
->list
);
4892 nf_tables_unregister_hooks(trans
->ctx
.net
,
4895 trans
->ctx
.afi
->nops
);
4898 case NFT_MSG_DELCHAIN
:
4899 trans
->ctx
.table
->use
++;
4900 nft_clear(trans
->ctx
.net
, trans
->ctx
.chain
);
4901 nft_trans_destroy(trans
);
4903 case NFT_MSG_NEWRULE
:
4904 trans
->ctx
.chain
->use
--;
4905 list_del_rcu(&nft_trans_rule(trans
)->list
);
4907 case NFT_MSG_DELRULE
:
4908 trans
->ctx
.chain
->use
++;
4909 nft_clear(trans
->ctx
.net
, nft_trans_rule(trans
));
4910 nft_trans_destroy(trans
);
4912 case NFT_MSG_NEWSET
:
4913 trans
->ctx
.table
->use
--;
4914 list_del_rcu(&nft_trans_set(trans
)->list
);
4916 case NFT_MSG_DELSET
:
4917 trans
->ctx
.table
->use
++;
4918 nft_clear(trans
->ctx
.net
, nft_trans_set(trans
));
4919 nft_trans_destroy(trans
);
4921 case NFT_MSG_NEWSETELEM
:
4922 te
= (struct nft_trans_elem
*)trans
->data
;
4924 te
->set
->ops
->remove(te
->set
, &te
->elem
);
4925 atomic_dec(&te
->set
->nelems
);
4927 case NFT_MSG_DELSETELEM
:
4928 te
= (struct nft_trans_elem
*)trans
->data
;
4930 te
->set
->ops
->activate(net
, te
->set
, &te
->elem
);
4933 nft_trans_destroy(trans
);
4935 case NFT_MSG_NEWOBJ
:
4936 trans
->ctx
.table
->use
--;
4937 list_del_rcu(&nft_trans_obj(trans
)->list
);
4939 case NFT_MSG_DELOBJ
:
4940 trans
->ctx
.table
->use
++;
4941 nft_clear(trans
->ctx
.net
, nft_trans_obj(trans
));
4942 nft_trans_destroy(trans
);
4949 list_for_each_entry_safe_reverse(trans
, next
,
4950 &net
->nft
.commit_list
, list
) {
4951 list_del(&trans
->list
);
4952 nf_tables_abort_release(trans
);
4958 static const struct nfnetlink_subsystem nf_tables_subsys
= {
4959 .name
= "nf_tables",
4960 .subsys_id
= NFNL_SUBSYS_NFTABLES
,
4961 .cb_count
= NFT_MSG_MAX
,
4963 .commit
= nf_tables_commit
,
4964 .abort
= nf_tables_abort
,
4967 int nft_chain_validate_dependency(const struct nft_chain
*chain
,
4968 enum nft_chain_type type
)
4970 const struct nft_base_chain
*basechain
;
4972 if (chain
->flags
& NFT_BASE_CHAIN
) {
4973 basechain
= nft_base_chain(chain
);
4974 if (basechain
->type
->type
!= type
)
4979 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency
);
4981 int nft_chain_validate_hooks(const struct nft_chain
*chain
,
4982 unsigned int hook_flags
)
4984 struct nft_base_chain
*basechain
;
4986 if (chain
->flags
& NFT_BASE_CHAIN
) {
4987 basechain
= nft_base_chain(chain
);
4989 if ((1 << basechain
->ops
[0].hooknum
) & hook_flags
)
4997 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks
);
5000 * Loop detection - walk through the ruleset beginning at the destination chain
5001 * of a new jump until either the source chain is reached (loop) or all
5002 * reachable chains have been traversed.
5004 * The loop check is performed whenever a new jump verdict is added to an
5005 * expression or verdict map or a verdict map is bound to a new chain.
5008 static int nf_tables_check_loops(const struct nft_ctx
*ctx
,
5009 const struct nft_chain
*chain
);
5011 static int nf_tables_loop_check_setelem(const struct nft_ctx
*ctx
,
5012 const struct nft_set
*set
,
5013 const struct nft_set_iter
*iter
,
5014 const struct nft_set_elem
*elem
)
5016 const struct nft_set_ext
*ext
= nft_set_elem_ext(set
, elem
->priv
);
5017 const struct nft_data
*data
;
5019 if (nft_set_ext_exists(ext
, NFT_SET_EXT_FLAGS
) &&
5020 *nft_set_ext_flags(ext
) & NFT_SET_ELEM_INTERVAL_END
)
5023 data
= nft_set_ext_data(ext
);
5024 switch (data
->verdict
.code
) {
5027 return nf_tables_check_loops(ctx
, data
->verdict
.chain
);
5033 static int nf_tables_check_loops(const struct nft_ctx
*ctx
,
5034 const struct nft_chain
*chain
)
5036 const struct nft_rule
*rule
;
5037 const struct nft_expr
*expr
, *last
;
5038 const struct nft_set
*set
;
5039 struct nft_set_binding
*binding
;
5040 struct nft_set_iter iter
;
5042 if (ctx
->chain
== chain
)
5045 list_for_each_entry(rule
, &chain
->rules
, list
) {
5046 nft_rule_for_each_expr(expr
, last
, rule
) {
5047 const struct nft_data
*data
= NULL
;
5050 if (!expr
->ops
->validate
)
5053 err
= expr
->ops
->validate(ctx
, expr
, &data
);
5060 switch (data
->verdict
.code
) {
5063 err
= nf_tables_check_loops(ctx
,
5064 data
->verdict
.chain
);
5073 list_for_each_entry(set
, &ctx
->table
->sets
, list
) {
5074 if (!nft_is_active_next(ctx
->net
, set
))
5076 if (!(set
->flags
& NFT_SET_MAP
) ||
5077 set
->dtype
!= NFT_DATA_VERDICT
)
5080 list_for_each_entry(binding
, &set
->bindings
, list
) {
5081 if (!(binding
->flags
& NFT_SET_MAP
) ||
5082 binding
->chain
!= chain
)
5085 iter
.genmask
= nft_genmask_next(ctx
->net
);
5089 iter
.fn
= nf_tables_loop_check_setelem
;
5091 set
->ops
->walk(ctx
, set
, &iter
);
5101 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
5103 * @attr: netlink attribute to fetch value from
5104 * @max: maximum value to be stored in dest
5105 * @dest: pointer to the variable
5107 * Parse, check and store a given u32 netlink attribute into variable.
5108 * This function returns -ERANGE if the value goes over maximum value.
5109 * Otherwise a 0 is returned and the attribute value is stored in the
5110 * destination variable.
5112 int nft_parse_u32_check(const struct nlattr
*attr
, int max
, u32
*dest
)
5116 val
= ntohl(nla_get_be32(attr
));
5123 EXPORT_SYMBOL_GPL(nft_parse_u32_check
);
5126 * nft_parse_register - parse a register value from a netlink attribute
5128 * @attr: netlink attribute
5130 * Parse and translate a register value from a netlink attribute.
5131 * Registers used to be 128 bit wide, these register numbers will be
5132 * mapped to the corresponding 32 bit register numbers.
5134 unsigned int nft_parse_register(const struct nlattr
*attr
)
5138 reg
= ntohl(nla_get_be32(attr
));
5140 case NFT_REG_VERDICT
...NFT_REG_4
:
5141 return reg
* NFT_REG_SIZE
/ NFT_REG32_SIZE
;
5143 return reg
+ NFT_REG_SIZE
/ NFT_REG32_SIZE
- NFT_REG32_00
;
5146 EXPORT_SYMBOL_GPL(nft_parse_register
);
5149 * nft_dump_register - dump a register value to a netlink attribute
5151 * @skb: socket buffer
5152 * @attr: attribute number
5153 * @reg: register number
5155 * Construct a netlink attribute containing the register number. For
5156 * compatibility reasons, register numbers being a multiple of 4 are
5157 * translated to the corresponding 128 bit register numbers.
5159 int nft_dump_register(struct sk_buff
*skb
, unsigned int attr
, unsigned int reg
)
5161 if (reg
% (NFT_REG_SIZE
/ NFT_REG32_SIZE
) == 0)
5162 reg
= reg
/ (NFT_REG_SIZE
/ NFT_REG32_SIZE
);
5164 reg
= reg
- NFT_REG_SIZE
/ NFT_REG32_SIZE
+ NFT_REG32_00
;
5166 return nla_put_be32(skb
, attr
, htonl(reg
));
5168 EXPORT_SYMBOL_GPL(nft_dump_register
);
5171 * nft_validate_register_load - validate a load from a register
5173 * @reg: the register number
5174 * @len: the length of the data
5176 * Validate that the input register is one of the general purpose
5177 * registers and that the length of the load is within the bounds.
5179 int nft_validate_register_load(enum nft_registers reg
, unsigned int len
)
5181 if (reg
< NFT_REG_1
* NFT_REG_SIZE
/ NFT_REG32_SIZE
)
5185 if (reg
* NFT_REG32_SIZE
+ len
> FIELD_SIZEOF(struct nft_regs
, data
))
5190 EXPORT_SYMBOL_GPL(nft_validate_register_load
);
5193 * nft_validate_register_store - validate an expressions' register store
5195 * @ctx: context of the expression performing the load
5196 * @reg: the destination register number
5197 * @data: the data to load
5198 * @type: the data type
5199 * @len: the length of the data
5201 * Validate that a data load uses the appropriate data type for
5202 * the destination register and the length is within the bounds.
5203 * A value of NULL for the data means that its runtime gathered
5206 int nft_validate_register_store(const struct nft_ctx
*ctx
,
5207 enum nft_registers reg
,
5208 const struct nft_data
*data
,
5209 enum nft_data_types type
, unsigned int len
)
5214 case NFT_REG_VERDICT
:
5215 if (type
!= NFT_DATA_VERDICT
)
5219 (data
->verdict
.code
== NFT_GOTO
||
5220 data
->verdict
.code
== NFT_JUMP
)) {
5221 err
= nf_tables_check_loops(ctx
, data
->verdict
.chain
);
5225 if (ctx
->chain
->level
+ 1 >
5226 data
->verdict
.chain
->level
) {
5227 if (ctx
->chain
->level
+ 1 == NFT_JUMP_STACK_SIZE
)
5229 data
->verdict
.chain
->level
= ctx
->chain
->level
+ 1;
5235 if (reg
< NFT_REG_1
* NFT_REG_SIZE
/ NFT_REG32_SIZE
)
5239 if (reg
* NFT_REG32_SIZE
+ len
>
5240 FIELD_SIZEOF(struct nft_regs
, data
))
5243 if (data
!= NULL
&& type
!= NFT_DATA_VALUE
)
5248 EXPORT_SYMBOL_GPL(nft_validate_register_store
);
5250 static const struct nla_policy nft_verdict_policy
[NFTA_VERDICT_MAX
+ 1] = {
5251 [NFTA_VERDICT_CODE
] = { .type
= NLA_U32
},
5252 [NFTA_VERDICT_CHAIN
] = { .type
= NLA_STRING
,
5253 .len
= NFT_CHAIN_MAXNAMELEN
- 1 },
5256 static int nft_verdict_init(const struct nft_ctx
*ctx
, struct nft_data
*data
,
5257 struct nft_data_desc
*desc
, const struct nlattr
*nla
)
5259 u8 genmask
= nft_genmask_next(ctx
->net
);
5260 struct nlattr
*tb
[NFTA_VERDICT_MAX
+ 1];
5261 struct nft_chain
*chain
;
5264 err
= nla_parse_nested(tb
, NFTA_VERDICT_MAX
, nla
, nft_verdict_policy
);
5268 if (!tb
[NFTA_VERDICT_CODE
])
5270 data
->verdict
.code
= ntohl(nla_get_be32(tb
[NFTA_VERDICT_CODE
]));
5272 switch (data
->verdict
.code
) {
5274 switch (data
->verdict
.code
& NF_VERDICT_MASK
) {
5289 if (!tb
[NFTA_VERDICT_CHAIN
])
5291 chain
= nf_tables_chain_lookup(ctx
->table
,
5292 tb
[NFTA_VERDICT_CHAIN
], genmask
);
5294 return PTR_ERR(chain
);
5295 if (chain
->flags
& NFT_BASE_CHAIN
)
5299 data
->verdict
.chain
= chain
;
5303 desc
->len
= sizeof(data
->verdict
);
5304 desc
->type
= NFT_DATA_VERDICT
;
5308 static void nft_verdict_uninit(const struct nft_data
*data
)
5310 switch (data
->verdict
.code
) {
5313 data
->verdict
.chain
->use
--;
5318 int nft_verdict_dump(struct sk_buff
*skb
, int type
, const struct nft_verdict
*v
)
5320 struct nlattr
*nest
;
5322 nest
= nla_nest_start(skb
, type
);
5324 goto nla_put_failure
;
5326 if (nla_put_be32(skb
, NFTA_VERDICT_CODE
, htonl(v
->code
)))
5327 goto nla_put_failure
;
5332 if (nla_put_string(skb
, NFTA_VERDICT_CHAIN
,
5334 goto nla_put_failure
;
5336 nla_nest_end(skb
, nest
);
5343 static int nft_value_init(const struct nft_ctx
*ctx
,
5344 struct nft_data
*data
, unsigned int size
,
5345 struct nft_data_desc
*desc
, const struct nlattr
*nla
)
5355 nla_memcpy(data
->data
, nla
, len
);
5356 desc
->type
= NFT_DATA_VALUE
;
5361 static int nft_value_dump(struct sk_buff
*skb
, const struct nft_data
*data
,
5364 return nla_put(skb
, NFTA_DATA_VALUE
, len
, data
->data
);
5367 static const struct nla_policy nft_data_policy
[NFTA_DATA_MAX
+ 1] = {
5368 [NFTA_DATA_VALUE
] = { .type
= NLA_BINARY
},
5369 [NFTA_DATA_VERDICT
] = { .type
= NLA_NESTED
},
5373 * nft_data_init - parse nf_tables data netlink attributes
5375 * @ctx: context of the expression using the data
5376 * @data: destination struct nft_data
5377 * @size: maximum data length
5378 * @desc: data description
5379 * @nla: netlink attribute containing data
5381 * Parse the netlink data attributes and initialize a struct nft_data.
5382 * The type and length of data are returned in the data description.
5384 * The caller can indicate that it only wants to accept data of type
5385 * NFT_DATA_VALUE by passing NULL for the ctx argument.
5387 int nft_data_init(const struct nft_ctx
*ctx
,
5388 struct nft_data
*data
, unsigned int size
,
5389 struct nft_data_desc
*desc
, const struct nlattr
*nla
)
5391 struct nlattr
*tb
[NFTA_DATA_MAX
+ 1];
5394 err
= nla_parse_nested(tb
, NFTA_DATA_MAX
, nla
, nft_data_policy
);
5398 if (tb
[NFTA_DATA_VALUE
])
5399 return nft_value_init(ctx
, data
, size
, desc
,
5400 tb
[NFTA_DATA_VALUE
]);
5401 if (tb
[NFTA_DATA_VERDICT
] && ctx
!= NULL
)
5402 return nft_verdict_init(ctx
, data
, desc
, tb
[NFTA_DATA_VERDICT
]);
5405 EXPORT_SYMBOL_GPL(nft_data_init
);
5408 * nft_data_uninit - release a nft_data item
5410 * @data: struct nft_data to release
5411 * @type: type of data
5413 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5414 * all others need to be released by calling this function.
5416 void nft_data_uninit(const struct nft_data
*data
, enum nft_data_types type
)
5418 if (type
< NFT_DATA_VERDICT
)
5421 case NFT_DATA_VERDICT
:
5422 return nft_verdict_uninit(data
);
5427 EXPORT_SYMBOL_GPL(nft_data_uninit
);
5429 int nft_data_dump(struct sk_buff
*skb
, int attr
, const struct nft_data
*data
,
5430 enum nft_data_types type
, unsigned int len
)
5432 struct nlattr
*nest
;
5435 nest
= nla_nest_start(skb
, attr
);
5440 case NFT_DATA_VALUE
:
5441 err
= nft_value_dump(skb
, data
, len
);
5443 case NFT_DATA_VERDICT
:
5444 err
= nft_verdict_dump(skb
, NFTA_DATA_VERDICT
, &data
->verdict
);
5451 nla_nest_end(skb
, nest
);
5454 EXPORT_SYMBOL_GPL(nft_data_dump
);
5456 static int __net_init
nf_tables_init_net(struct net
*net
)
5458 INIT_LIST_HEAD(&net
->nft
.af_info
);
5459 INIT_LIST_HEAD(&net
->nft
.commit_list
);
5460 net
->nft
.base_seq
= 1;
5464 int __nft_release_basechain(struct nft_ctx
*ctx
)
5466 struct nft_rule
*rule
, *nr
;
5468 BUG_ON(!(ctx
->chain
->flags
& NFT_BASE_CHAIN
));
5470 nf_tables_unregister_hooks(ctx
->net
, ctx
->chain
->table
, ctx
->chain
,
5472 list_for_each_entry_safe(rule
, nr
, &ctx
->chain
->rules
, list
) {
5473 list_del(&rule
->list
);
5475 nf_tables_rule_destroy(ctx
, rule
);
5477 list_del(&ctx
->chain
->list
);
5479 nf_tables_chain_destroy(ctx
->chain
);
5483 EXPORT_SYMBOL_GPL(__nft_release_basechain
);
5485 /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
5486 static void __nft_release_afinfo(struct net
*net
, struct nft_af_info
*afi
)
5488 struct nft_table
*table
, *nt
;
5489 struct nft_chain
*chain
, *nc
;
5490 struct nft_object
*obj
, *ne
;
5491 struct nft_rule
*rule
, *nr
;
5492 struct nft_set
*set
, *ns
;
5493 struct nft_ctx ctx
= {
5498 list_for_each_entry_safe(table
, nt
, &afi
->tables
, list
) {
5499 list_for_each_entry(chain
, &table
->chains
, list
)
5500 nf_tables_unregister_hooks(net
, table
, chain
,
5502 /* No packets are walking on these chains anymore. */
5504 list_for_each_entry(chain
, &table
->chains
, list
) {
5506 list_for_each_entry_safe(rule
, nr
, &chain
->rules
, list
) {
5507 list_del(&rule
->list
);
5509 nf_tables_rule_destroy(&ctx
, rule
);
5512 list_for_each_entry_safe(set
, ns
, &table
->sets
, list
) {
5513 list_del(&set
->list
);
5515 nft_set_destroy(set
);
5517 list_for_each_entry_safe(obj
, ne
, &table
->objects
, list
) {
5518 list_del(&obj
->list
);
5520 nft_obj_destroy(obj
);
5522 list_for_each_entry_safe(chain
, nc
, &table
->chains
, list
) {
5523 list_del(&chain
->list
);
5525 nf_tables_chain_destroy(chain
);
5527 list_del(&table
->list
);
5528 nf_tables_table_destroy(&ctx
);
5532 static struct pernet_operations nf_tables_net_ops
= {
5533 .init
= nf_tables_init_net
,
5536 static int __init
nf_tables_module_init(void)
5540 info
= kmalloc(sizeof(struct nft_expr_info
) * NFT_RULE_MAXEXPRS
,
5547 err
= nf_tables_core_module_init();
5551 err
= nfnetlink_subsys_register(&nf_tables_subsys
);
5555 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
5556 return register_pernet_subsys(&nf_tables_net_ops
);
5558 nf_tables_core_module_exit();
5565 static void __exit
nf_tables_module_exit(void)
5567 unregister_pernet_subsys(&nf_tables_net_ops
);
5568 nfnetlink_subsys_unregister(&nf_tables_subsys
);
5570 nf_tables_core_module_exit();
5574 module_init(nf_tables_module_init
);
5575 module_exit(nf_tables_module_exit
);
5577 MODULE_LICENSE("GPL");
5578 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
5579 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES
);