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
);
27 * nft_register_afinfo - register nf_tables address family info
29 * @afi: address family info to register
31 * Register the address family for use with nf_tables. Returns zero on
32 * success or a negative errno code otherwise.
34 int nft_register_afinfo(struct net
*net
, struct nft_af_info
*afi
)
36 INIT_LIST_HEAD(&afi
->tables
);
37 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
38 list_add_tail(&afi
->list
, &net
->nft
.af_info
);
39 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
42 EXPORT_SYMBOL_GPL(nft_register_afinfo
);
45 * nft_unregister_afinfo - unregister nf_tables address family info
47 * @afi: address family info to unregister
49 * Unregister the address family for use with nf_tables.
51 void nft_unregister_afinfo(struct nft_af_info
*afi
)
53 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
55 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
57 EXPORT_SYMBOL_GPL(nft_unregister_afinfo
);
59 static struct nft_af_info
*nft_afinfo_lookup(struct net
*net
, int family
)
61 struct nft_af_info
*afi
;
63 list_for_each_entry(afi
, &net
->nft
.af_info
, list
) {
64 if (afi
->family
== family
)
70 static struct nft_af_info
*
71 nf_tables_afinfo_lookup(struct net
*net
, int family
, bool autoload
)
73 struct nft_af_info
*afi
;
75 afi
= nft_afinfo_lookup(net
, family
);
80 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
81 request_module("nft-afinfo-%u", family
);
82 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
83 afi
= nft_afinfo_lookup(net
, family
);
85 return ERR_PTR(-EAGAIN
);
88 return ERR_PTR(-EAFNOSUPPORT
);
91 static void nft_ctx_init(struct nft_ctx
*ctx
,
92 const struct sk_buff
*skb
,
93 const struct nlmsghdr
*nlh
,
94 struct nft_af_info
*afi
,
95 struct nft_table
*table
,
96 struct nft_chain
*chain
,
97 const struct nlattr
* const *nla
)
99 ctx
->net
= sock_net(skb
->sk
);
104 ctx
->portid
= NETLINK_CB(skb
).portid
;
105 ctx
->report
= nlmsg_report(nlh
);
106 ctx
->seq
= nlh
->nlmsg_seq
;
109 static struct nft_trans
*nft_trans_alloc(struct nft_ctx
*ctx
, int msg_type
,
112 struct nft_trans
*trans
;
114 trans
= kzalloc(sizeof(struct nft_trans
) + size
, GFP_KERNEL
);
118 trans
->msg_type
= msg_type
;
124 static void nft_trans_destroy(struct nft_trans
*trans
)
126 list_del(&trans
->list
);
134 static struct nft_table
*nft_table_lookup(const struct nft_af_info
*afi
,
135 const struct nlattr
*nla
)
137 struct nft_table
*table
;
139 list_for_each_entry(table
, &afi
->tables
, list
) {
140 if (!nla_strcmp(nla
, table
->name
))
146 static struct nft_table
*nf_tables_table_lookup(const struct nft_af_info
*afi
,
147 const struct nlattr
*nla
)
149 struct nft_table
*table
;
152 return ERR_PTR(-EINVAL
);
154 table
= nft_table_lookup(afi
, nla
);
158 return ERR_PTR(-ENOENT
);
161 static inline u64
nf_tables_alloc_handle(struct nft_table
*table
)
163 return ++table
->hgenerator
;
166 static const struct nf_chain_type
*chain_type
[AF_MAX
][NFT_CHAIN_T_MAX
];
168 static const struct nf_chain_type
*
169 __nf_tables_chain_type_lookup(int family
, const struct nlattr
*nla
)
173 for (i
= 0; i
< NFT_CHAIN_T_MAX
; i
++) {
174 if (chain_type
[family
][i
] != NULL
&&
175 !nla_strcmp(nla
, chain_type
[family
][i
]->name
))
176 return chain_type
[family
][i
];
181 static const struct nf_chain_type
*
182 nf_tables_chain_type_lookup(const struct nft_af_info
*afi
,
183 const struct nlattr
*nla
,
186 const struct nf_chain_type
*type
;
188 type
= __nf_tables_chain_type_lookup(afi
->family
, nla
);
191 #ifdef CONFIG_MODULES
193 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
194 request_module("nft-chain-%u-%.*s", afi
->family
,
195 nla_len(nla
), (const char *)nla_data(nla
));
196 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
197 type
= __nf_tables_chain_type_lookup(afi
->family
, nla
);
199 return ERR_PTR(-EAGAIN
);
202 return ERR_PTR(-ENOENT
);
205 static const struct nla_policy nft_table_policy
[NFTA_TABLE_MAX
+ 1] = {
206 [NFTA_TABLE_NAME
] = { .type
= NLA_STRING
},
207 [NFTA_TABLE_FLAGS
] = { .type
= NLA_U32
},
210 static int nf_tables_fill_table_info(struct sk_buff
*skb
, u32 portid
, u32 seq
,
211 int event
, u32 flags
, int family
,
212 const struct nft_table
*table
)
214 struct nlmsghdr
*nlh
;
215 struct nfgenmsg
*nfmsg
;
217 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
218 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
), flags
);
220 goto nla_put_failure
;
222 nfmsg
= nlmsg_data(nlh
);
223 nfmsg
->nfgen_family
= family
;
224 nfmsg
->version
= NFNETLINK_V0
;
227 if (nla_put_string(skb
, NFTA_TABLE_NAME
, table
->name
) ||
228 nla_put_be32(skb
, NFTA_TABLE_FLAGS
, htonl(table
->flags
)) ||
229 nla_put_be32(skb
, NFTA_TABLE_USE
, htonl(table
->use
)))
230 goto nla_put_failure
;
232 return nlmsg_end(skb
, nlh
);
235 nlmsg_trim(skb
, nlh
);
239 static int nf_tables_table_notify(const struct nft_ctx
*ctx
, int event
)
245 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
249 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
253 err
= nf_tables_fill_table_info(skb
, ctx
->portid
, ctx
->seq
, event
, 0,
254 ctx
->afi
->family
, ctx
->table
);
260 err
= nfnetlink_send(skb
, ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
261 ctx
->report
, GFP_KERNEL
);
264 nfnetlink_set_err(ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
270 static int nf_tables_dump_tables(struct sk_buff
*skb
,
271 struct netlink_callback
*cb
)
273 const struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
274 const struct nft_af_info
*afi
;
275 const struct nft_table
*table
;
276 unsigned int idx
= 0, s_idx
= cb
->args
[0];
277 struct net
*net
= sock_net(skb
->sk
);
278 int family
= nfmsg
->nfgen_family
;
280 list_for_each_entry(afi
, &net
->nft
.af_info
, list
) {
281 if (family
!= NFPROTO_UNSPEC
&& family
!= afi
->family
)
284 list_for_each_entry(table
, &afi
->tables
, list
) {
288 memset(&cb
->args
[1], 0,
289 sizeof(cb
->args
) - sizeof(cb
->args
[0]));
290 if (nf_tables_fill_table_info(skb
,
291 NETLINK_CB(cb
->skb
).portid
,
295 afi
->family
, table
) < 0)
306 /* Internal table flags */
307 #define NFT_TABLE_INACTIVE (1 << 15)
309 static int nf_tables_gettable(struct sock
*nlsk
, struct sk_buff
*skb
,
310 const struct nlmsghdr
*nlh
,
311 const struct nlattr
* const nla
[])
313 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
314 const struct nft_af_info
*afi
;
315 const struct nft_table
*table
;
316 struct sk_buff
*skb2
;
317 struct net
*net
= sock_net(skb
->sk
);
318 int family
= nfmsg
->nfgen_family
;
321 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
322 struct netlink_dump_control c
= {
323 .dump
= nf_tables_dump_tables
,
325 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
328 afi
= nf_tables_afinfo_lookup(net
, family
, false);
332 table
= nf_tables_table_lookup(afi
, nla
[NFTA_TABLE_NAME
]);
334 return PTR_ERR(table
);
335 if (table
->flags
& NFT_TABLE_INACTIVE
)
338 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
342 err
= nf_tables_fill_table_info(skb2
, NETLINK_CB(skb
).portid
,
343 nlh
->nlmsg_seq
, NFT_MSG_NEWTABLE
, 0,
348 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
355 static int nf_tables_table_enable(const struct nft_af_info
*afi
,
356 struct nft_table
*table
)
358 struct nft_chain
*chain
;
361 list_for_each_entry(chain
, &table
->chains
, list
) {
362 if (!(chain
->flags
& NFT_BASE_CHAIN
))
365 err
= nf_register_hooks(nft_base_chain(chain
)->ops
, afi
->nops
);
373 list_for_each_entry(chain
, &table
->chains
, list
) {
374 if (!(chain
->flags
& NFT_BASE_CHAIN
))
380 nf_unregister_hooks(nft_base_chain(chain
)->ops
, afi
->nops
);
385 static void nf_tables_table_disable(const struct nft_af_info
*afi
,
386 struct nft_table
*table
)
388 struct nft_chain
*chain
;
390 list_for_each_entry(chain
, &table
->chains
, list
) {
391 if (chain
->flags
& NFT_BASE_CHAIN
)
392 nf_unregister_hooks(nft_base_chain(chain
)->ops
,
397 static int nf_tables_updtable(struct nft_ctx
*ctx
)
399 struct nft_trans
*trans
;
403 if (!ctx
->nla
[NFTA_TABLE_FLAGS
])
406 flags
= ntohl(nla_get_be32(ctx
->nla
[NFTA_TABLE_FLAGS
]));
407 if (flags
& ~NFT_TABLE_F_DORMANT
)
410 trans
= nft_trans_alloc(ctx
, NFT_MSG_NEWTABLE
,
411 sizeof(struct nft_trans_table
));
415 if ((flags
& NFT_TABLE_F_DORMANT
) &&
416 !(ctx
->table
->flags
& NFT_TABLE_F_DORMANT
)) {
417 nft_trans_table_enable(trans
) = false;
418 } else if (!(flags
& NFT_TABLE_F_DORMANT
) &&
419 ctx
->table
->flags
& NFT_TABLE_F_DORMANT
) {
420 ret
= nf_tables_table_enable(ctx
->afi
, ctx
->table
);
422 ctx
->table
->flags
&= ~NFT_TABLE_F_DORMANT
;
423 nft_trans_table_enable(trans
) = true;
429 nft_trans_table_update(trans
) = true;
430 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
433 nft_trans_destroy(trans
);
437 static int nft_trans_table_add(struct nft_ctx
*ctx
, int msg_type
)
439 struct nft_trans
*trans
;
441 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_table
));
445 if (msg_type
== NFT_MSG_NEWTABLE
)
446 ctx
->table
->flags
|= NFT_TABLE_INACTIVE
;
448 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
452 static int nf_tables_newtable(struct sock
*nlsk
, struct sk_buff
*skb
,
453 const struct nlmsghdr
*nlh
,
454 const struct nlattr
* const nla
[])
456 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
457 const struct nlattr
*name
;
458 struct nft_af_info
*afi
;
459 struct nft_table
*table
;
460 struct net
*net
= sock_net(skb
->sk
);
461 int family
= nfmsg
->nfgen_family
;
466 afi
= nf_tables_afinfo_lookup(net
, family
, true);
470 name
= nla
[NFTA_TABLE_NAME
];
471 table
= nf_tables_table_lookup(afi
, name
);
473 if (PTR_ERR(table
) != -ENOENT
)
474 return PTR_ERR(table
);
479 if (table
->flags
& NFT_TABLE_INACTIVE
)
481 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
483 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
486 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, NULL
, nla
);
487 return nf_tables_updtable(&ctx
);
490 if (nla
[NFTA_TABLE_FLAGS
]) {
491 flags
= ntohl(nla_get_be32(nla
[NFTA_TABLE_FLAGS
]));
492 if (flags
& ~NFT_TABLE_F_DORMANT
)
496 if (!try_module_get(afi
->owner
))
497 return -EAFNOSUPPORT
;
499 table
= kzalloc(sizeof(*table
) + nla_len(name
), GFP_KERNEL
);
501 module_put(afi
->owner
);
505 nla_strlcpy(table
->name
, name
, nla_len(name
));
506 INIT_LIST_HEAD(&table
->chains
);
507 INIT_LIST_HEAD(&table
->sets
);
508 table
->flags
= flags
;
510 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, NULL
, nla
);
511 err
= nft_trans_table_add(&ctx
, NFT_MSG_NEWTABLE
);
514 module_put(afi
->owner
);
517 list_add_tail(&table
->list
, &afi
->tables
);
521 static int nf_tables_deltable(struct sock
*nlsk
, struct sk_buff
*skb
,
522 const struct nlmsghdr
*nlh
,
523 const struct nlattr
* const nla
[])
525 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
526 struct nft_af_info
*afi
;
527 struct nft_table
*table
;
528 struct net
*net
= sock_net(skb
->sk
);
529 int family
= nfmsg
->nfgen_family
, err
;
532 afi
= nf_tables_afinfo_lookup(net
, family
, false);
536 table
= nf_tables_table_lookup(afi
, nla
[NFTA_TABLE_NAME
]);
538 return PTR_ERR(table
);
539 if (table
->flags
& NFT_TABLE_INACTIVE
)
544 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, NULL
, nla
);
545 err
= nft_trans_table_add(&ctx
, NFT_MSG_DELTABLE
);
549 list_del(&table
->list
);
553 static void nf_tables_table_destroy(struct nft_ctx
*ctx
)
555 BUG_ON(ctx
->table
->use
> 0);
558 module_put(ctx
->afi
->owner
);
561 int nft_register_chain_type(const struct nf_chain_type
*ctype
)
565 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
566 if (chain_type
[ctype
->family
][ctype
->type
] != NULL
) {
570 chain_type
[ctype
->family
][ctype
->type
] = ctype
;
572 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
575 EXPORT_SYMBOL_GPL(nft_register_chain_type
);
577 void nft_unregister_chain_type(const struct nf_chain_type
*ctype
)
579 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
580 chain_type
[ctype
->family
][ctype
->type
] = NULL
;
581 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
583 EXPORT_SYMBOL_GPL(nft_unregister_chain_type
);
589 static struct nft_chain
*
590 nf_tables_chain_lookup_byhandle(const struct nft_table
*table
, u64 handle
)
592 struct nft_chain
*chain
;
594 list_for_each_entry(chain
, &table
->chains
, list
) {
595 if (chain
->handle
== handle
)
599 return ERR_PTR(-ENOENT
);
602 static struct nft_chain
*nf_tables_chain_lookup(const struct nft_table
*table
,
603 const struct nlattr
*nla
)
605 struct nft_chain
*chain
;
608 return ERR_PTR(-EINVAL
);
610 list_for_each_entry(chain
, &table
->chains
, list
) {
611 if (!nla_strcmp(nla
, chain
->name
))
615 return ERR_PTR(-ENOENT
);
618 static const struct nla_policy nft_chain_policy
[NFTA_CHAIN_MAX
+ 1] = {
619 [NFTA_CHAIN_TABLE
] = { .type
= NLA_STRING
},
620 [NFTA_CHAIN_HANDLE
] = { .type
= NLA_U64
},
621 [NFTA_CHAIN_NAME
] = { .type
= NLA_STRING
,
622 .len
= NFT_CHAIN_MAXNAMELEN
- 1 },
623 [NFTA_CHAIN_HOOK
] = { .type
= NLA_NESTED
},
624 [NFTA_CHAIN_POLICY
] = { .type
= NLA_U32
},
625 [NFTA_CHAIN_TYPE
] = { .type
= NLA_STRING
},
626 [NFTA_CHAIN_COUNTERS
] = { .type
= NLA_NESTED
},
629 static const struct nla_policy nft_hook_policy
[NFTA_HOOK_MAX
+ 1] = {
630 [NFTA_HOOK_HOOKNUM
] = { .type
= NLA_U32
},
631 [NFTA_HOOK_PRIORITY
] = { .type
= NLA_U32
},
634 static int nft_dump_stats(struct sk_buff
*skb
, struct nft_stats __percpu
*stats
)
636 struct nft_stats
*cpu_stats
, total
;
640 memset(&total
, 0, sizeof(total
));
641 for_each_possible_cpu(cpu
) {
642 cpu_stats
= per_cpu_ptr(stats
, cpu
);
643 total
.pkts
+= cpu_stats
->pkts
;
644 total
.bytes
+= cpu_stats
->bytes
;
646 nest
= nla_nest_start(skb
, NFTA_CHAIN_COUNTERS
);
648 goto nla_put_failure
;
650 if (nla_put_be64(skb
, NFTA_COUNTER_PACKETS
, cpu_to_be64(total
.pkts
)) ||
651 nla_put_be64(skb
, NFTA_COUNTER_BYTES
, cpu_to_be64(total
.bytes
)))
652 goto nla_put_failure
;
654 nla_nest_end(skb
, nest
);
661 static int nf_tables_fill_chain_info(struct sk_buff
*skb
, u32 portid
, u32 seq
,
662 int event
, u32 flags
, int family
,
663 const struct nft_table
*table
,
664 const struct nft_chain
*chain
)
666 struct nlmsghdr
*nlh
;
667 struct nfgenmsg
*nfmsg
;
669 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
670 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
), flags
);
672 goto nla_put_failure
;
674 nfmsg
= nlmsg_data(nlh
);
675 nfmsg
->nfgen_family
= family
;
676 nfmsg
->version
= NFNETLINK_V0
;
679 if (nla_put_string(skb
, NFTA_CHAIN_TABLE
, table
->name
))
680 goto nla_put_failure
;
681 if (nla_put_be64(skb
, NFTA_CHAIN_HANDLE
, cpu_to_be64(chain
->handle
)))
682 goto nla_put_failure
;
683 if (nla_put_string(skb
, NFTA_CHAIN_NAME
, chain
->name
))
684 goto nla_put_failure
;
686 if (chain
->flags
& NFT_BASE_CHAIN
) {
687 const struct nft_base_chain
*basechain
= nft_base_chain(chain
);
688 const struct nf_hook_ops
*ops
= &basechain
->ops
[0];
691 nest
= nla_nest_start(skb
, NFTA_CHAIN_HOOK
);
693 goto nla_put_failure
;
694 if (nla_put_be32(skb
, NFTA_HOOK_HOOKNUM
, htonl(ops
->hooknum
)))
695 goto nla_put_failure
;
696 if (nla_put_be32(skb
, NFTA_HOOK_PRIORITY
, htonl(ops
->priority
)))
697 goto nla_put_failure
;
698 nla_nest_end(skb
, nest
);
700 if (nla_put_be32(skb
, NFTA_CHAIN_POLICY
,
701 htonl(basechain
->policy
)))
702 goto nla_put_failure
;
704 if (nla_put_string(skb
, NFTA_CHAIN_TYPE
, basechain
->type
->name
))
705 goto nla_put_failure
;
707 if (nft_dump_stats(skb
, nft_base_chain(chain
)->stats
))
708 goto nla_put_failure
;
711 if (nla_put_be32(skb
, NFTA_CHAIN_USE
, htonl(chain
->use
)))
712 goto nla_put_failure
;
714 return nlmsg_end(skb
, nlh
);
717 nlmsg_trim(skb
, nlh
);
721 static int nf_tables_chain_notify(const struct nft_ctx
*ctx
, int event
)
727 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
731 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
735 err
= nf_tables_fill_chain_info(skb
, ctx
->portid
, ctx
->seq
, event
, 0,
736 ctx
->afi
->family
, ctx
->table
,
743 err
= nfnetlink_send(skb
, ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
744 ctx
->report
, GFP_KERNEL
);
747 nfnetlink_set_err(ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
753 static int nf_tables_dump_chains(struct sk_buff
*skb
,
754 struct netlink_callback
*cb
)
756 const struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
757 const struct nft_af_info
*afi
;
758 const struct nft_table
*table
;
759 const struct nft_chain
*chain
;
760 unsigned int idx
= 0, s_idx
= cb
->args
[0];
761 struct net
*net
= sock_net(skb
->sk
);
762 int family
= nfmsg
->nfgen_family
;
764 list_for_each_entry(afi
, &net
->nft
.af_info
, list
) {
765 if (family
!= NFPROTO_UNSPEC
&& family
!= afi
->family
)
768 list_for_each_entry(table
, &afi
->tables
, list
) {
769 list_for_each_entry(chain
, &table
->chains
, list
) {
773 memset(&cb
->args
[1], 0,
774 sizeof(cb
->args
) - sizeof(cb
->args
[0]));
775 if (nf_tables_fill_chain_info(skb
, NETLINK_CB(cb
->skb
).portid
,
779 afi
->family
, table
, chain
) < 0)
792 static int nf_tables_getchain(struct sock
*nlsk
, struct sk_buff
*skb
,
793 const struct nlmsghdr
*nlh
,
794 const struct nlattr
* const nla
[])
796 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
797 const struct nft_af_info
*afi
;
798 const struct nft_table
*table
;
799 const struct nft_chain
*chain
;
800 struct sk_buff
*skb2
;
801 struct net
*net
= sock_net(skb
->sk
);
802 int family
= nfmsg
->nfgen_family
;
805 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
806 struct netlink_dump_control c
= {
807 .dump
= nf_tables_dump_chains
,
809 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
812 afi
= nf_tables_afinfo_lookup(net
, family
, false);
816 table
= nf_tables_table_lookup(afi
, nla
[NFTA_CHAIN_TABLE
]);
818 return PTR_ERR(table
);
819 if (table
->flags
& NFT_TABLE_INACTIVE
)
822 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_CHAIN_NAME
]);
824 return PTR_ERR(chain
);
825 if (chain
->flags
& NFT_CHAIN_INACTIVE
)
828 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
832 err
= nf_tables_fill_chain_info(skb2
, NETLINK_CB(skb
).portid
,
833 nlh
->nlmsg_seq
, NFT_MSG_NEWCHAIN
, 0,
834 family
, table
, chain
);
838 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
845 static const struct nla_policy nft_counter_policy
[NFTA_COUNTER_MAX
+ 1] = {
846 [NFTA_COUNTER_PACKETS
] = { .type
= NLA_U64
},
847 [NFTA_COUNTER_BYTES
] = { .type
= NLA_U64
},
850 static struct nft_stats __percpu
*nft_stats_alloc(const struct nlattr
*attr
)
852 struct nlattr
*tb
[NFTA_COUNTER_MAX
+1];
853 struct nft_stats __percpu
*newstats
;
854 struct nft_stats
*stats
;
857 err
= nla_parse_nested(tb
, NFTA_COUNTER_MAX
, attr
, nft_counter_policy
);
861 if (!tb
[NFTA_COUNTER_BYTES
] || !tb
[NFTA_COUNTER_PACKETS
])
862 return ERR_PTR(-EINVAL
);
864 newstats
= alloc_percpu(struct nft_stats
);
865 if (newstats
== NULL
)
866 return ERR_PTR(-ENOMEM
);
868 /* Restore old counters on this cpu, no problem. Per-cpu statistics
869 * are not exposed to userspace.
871 stats
= this_cpu_ptr(newstats
);
872 stats
->bytes
= be64_to_cpu(nla_get_be64(tb
[NFTA_COUNTER_BYTES
]));
873 stats
->pkts
= be64_to_cpu(nla_get_be64(tb
[NFTA_COUNTER_PACKETS
]));
878 static void nft_chain_stats_replace(struct nft_base_chain
*chain
,
879 struct nft_stats __percpu
*newstats
)
882 struct nft_stats __percpu
*oldstats
=
883 nft_dereference(chain
->stats
);
885 rcu_assign_pointer(chain
->stats
, newstats
);
887 free_percpu(oldstats
);
889 rcu_assign_pointer(chain
->stats
, newstats
);
892 static int nft_trans_chain_add(struct nft_ctx
*ctx
, int msg_type
)
894 struct nft_trans
*trans
;
896 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_chain
));
900 if (msg_type
== NFT_MSG_NEWCHAIN
)
901 ctx
->chain
->flags
|= NFT_CHAIN_INACTIVE
;
903 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
907 static void nf_tables_chain_destroy(struct nft_chain
*chain
)
909 BUG_ON(chain
->use
> 0);
911 if (chain
->flags
& NFT_BASE_CHAIN
) {
912 module_put(nft_base_chain(chain
)->type
->owner
);
913 free_percpu(nft_base_chain(chain
)->stats
);
914 kfree(nft_base_chain(chain
));
920 static int nf_tables_newchain(struct sock
*nlsk
, struct sk_buff
*skb
,
921 const struct nlmsghdr
*nlh
,
922 const struct nlattr
* const nla
[])
924 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
925 const struct nlattr
* uninitialized_var(name
);
926 struct nft_af_info
*afi
;
927 struct nft_table
*table
;
928 struct nft_chain
*chain
;
929 struct nft_base_chain
*basechain
= NULL
;
930 struct nlattr
*ha
[NFTA_HOOK_MAX
+ 1];
931 struct net
*net
= sock_net(skb
->sk
);
932 int family
= nfmsg
->nfgen_family
;
933 u8 policy
= NF_ACCEPT
;
936 struct nft_stats __percpu
*stats
;
941 create
= nlh
->nlmsg_flags
& NLM_F_CREATE
? true : false;
943 afi
= nf_tables_afinfo_lookup(net
, family
, true);
947 table
= nf_tables_table_lookup(afi
, nla
[NFTA_CHAIN_TABLE
]);
949 return PTR_ERR(table
);
952 name
= nla
[NFTA_CHAIN_NAME
];
954 if (nla
[NFTA_CHAIN_HANDLE
]) {
955 handle
= be64_to_cpu(nla_get_be64(nla
[NFTA_CHAIN_HANDLE
]));
956 chain
= nf_tables_chain_lookup_byhandle(table
, handle
);
958 return PTR_ERR(chain
);
960 chain
= nf_tables_chain_lookup(table
, name
);
962 if (PTR_ERR(chain
) != -ENOENT
)
963 return PTR_ERR(chain
);
968 if (nla
[NFTA_CHAIN_POLICY
]) {
969 if ((chain
!= NULL
&&
970 !(chain
->flags
& NFT_BASE_CHAIN
)) ||
971 nla
[NFTA_CHAIN_HOOK
] == NULL
)
974 policy
= ntohl(nla_get_be32(nla
[NFTA_CHAIN_POLICY
]));
985 struct nft_stats
*stats
= NULL
;
986 struct nft_trans
*trans
;
988 if (chain
->flags
& NFT_CHAIN_INACTIVE
)
990 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
992 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
995 if (nla
[NFTA_CHAIN_HANDLE
] && name
&&
996 !IS_ERR(nf_tables_chain_lookup(table
, nla
[NFTA_CHAIN_NAME
])))
999 if (nla
[NFTA_CHAIN_COUNTERS
]) {
1000 if (!(chain
->flags
& NFT_BASE_CHAIN
))
1003 stats
= nft_stats_alloc(nla
[NFTA_CHAIN_COUNTERS
]);
1005 return PTR_ERR(stats
);
1008 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, chain
, nla
);
1009 trans
= nft_trans_alloc(&ctx
, NFT_MSG_NEWCHAIN
,
1010 sizeof(struct nft_trans_chain
));
1014 nft_trans_chain_stats(trans
) = stats
;
1015 nft_trans_chain_update(trans
) = true;
1017 if (nla
[NFTA_CHAIN_POLICY
])
1018 nft_trans_chain_policy(trans
) = policy
;
1020 nft_trans_chain_policy(trans
) = -1;
1022 if (nla
[NFTA_CHAIN_HANDLE
] && name
) {
1023 nla_strlcpy(nft_trans_chain_name(trans
), name
,
1024 NFT_CHAIN_MAXNAMELEN
);
1026 list_add_tail(&trans
->list
, &net
->nft
.commit_list
);
1030 if (table
->use
== UINT_MAX
)
1033 if (nla
[NFTA_CHAIN_HOOK
]) {
1034 const struct nf_chain_type
*type
;
1035 struct nf_hook_ops
*ops
;
1037 u32 hooknum
, priority
;
1039 type
= chain_type
[family
][NFT_CHAIN_T_DEFAULT
];
1040 if (nla
[NFTA_CHAIN_TYPE
]) {
1041 type
= nf_tables_chain_type_lookup(afi
,
1042 nla
[NFTA_CHAIN_TYPE
],
1045 return PTR_ERR(type
);
1048 err
= nla_parse_nested(ha
, NFTA_HOOK_MAX
, nla
[NFTA_CHAIN_HOOK
],
1052 if (ha
[NFTA_HOOK_HOOKNUM
] == NULL
||
1053 ha
[NFTA_HOOK_PRIORITY
] == NULL
)
1056 hooknum
= ntohl(nla_get_be32(ha
[NFTA_HOOK_HOOKNUM
]));
1057 if (hooknum
>= afi
->nhooks
)
1059 priority
= ntohl(nla_get_be32(ha
[NFTA_HOOK_PRIORITY
]));
1061 if (!(type
->hook_mask
& (1 << hooknum
)))
1063 if (!try_module_get(type
->owner
))
1065 hookfn
= type
->hooks
[hooknum
];
1067 basechain
= kzalloc(sizeof(*basechain
), GFP_KERNEL
);
1068 if (basechain
== NULL
)
1071 if (nla
[NFTA_CHAIN_COUNTERS
]) {
1072 stats
= nft_stats_alloc(nla
[NFTA_CHAIN_COUNTERS
]);
1073 if (IS_ERR(stats
)) {
1074 module_put(type
->owner
);
1076 return PTR_ERR(stats
);
1078 basechain
->stats
= stats
;
1080 stats
= alloc_percpu(struct nft_stats
);
1081 if (IS_ERR(stats
)) {
1082 module_put(type
->owner
);
1084 return PTR_ERR(stats
);
1086 rcu_assign_pointer(basechain
->stats
, stats
);
1089 basechain
->type
= type
;
1090 chain
= &basechain
->chain
;
1092 for (i
= 0; i
< afi
->nops
; i
++) {
1093 ops
= &basechain
->ops
[i
];
1095 ops
->owner
= afi
->owner
;
1096 ops
->hooknum
= hooknum
;
1097 ops
->priority
= priority
;
1099 ops
->hook
= afi
->hooks
[ops
->hooknum
];
1102 if (afi
->hook_ops_init
)
1103 afi
->hook_ops_init(ops
, i
);
1106 chain
->flags
|= NFT_BASE_CHAIN
;
1107 basechain
->policy
= policy
;
1109 chain
= kzalloc(sizeof(*chain
), GFP_KERNEL
);
1114 INIT_LIST_HEAD(&chain
->rules
);
1115 chain
->handle
= nf_tables_alloc_handle(table
);
1117 chain
->table
= table
;
1118 nla_strlcpy(chain
->name
, name
, NFT_CHAIN_MAXNAMELEN
);
1120 if (!(table
->flags
& NFT_TABLE_F_DORMANT
) &&
1121 chain
->flags
& NFT_BASE_CHAIN
) {
1122 err
= nf_register_hooks(nft_base_chain(chain
)->ops
, afi
->nops
);
1127 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, chain
, nla
);
1128 err
= nft_trans_chain_add(&ctx
, NFT_MSG_NEWCHAIN
);
1133 list_add_tail(&chain
->list
, &table
->chains
);
1136 if (!(table
->flags
& NFT_TABLE_F_DORMANT
) &&
1137 chain
->flags
& NFT_BASE_CHAIN
) {
1138 nf_unregister_hooks(nft_base_chain(chain
)->ops
,
1142 nf_tables_chain_destroy(chain
);
1146 static int nf_tables_delchain(struct sock
*nlsk
, struct sk_buff
*skb
,
1147 const struct nlmsghdr
*nlh
,
1148 const struct nlattr
* const nla
[])
1150 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1151 struct nft_af_info
*afi
;
1152 struct nft_table
*table
;
1153 struct nft_chain
*chain
;
1154 struct net
*net
= sock_net(skb
->sk
);
1155 int family
= nfmsg
->nfgen_family
;
1159 afi
= nf_tables_afinfo_lookup(net
, family
, false);
1161 return PTR_ERR(afi
);
1163 table
= nf_tables_table_lookup(afi
, nla
[NFTA_CHAIN_TABLE
]);
1165 return PTR_ERR(table
);
1166 if (table
->flags
& NFT_TABLE_INACTIVE
)
1169 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_CHAIN_NAME
]);
1171 return PTR_ERR(chain
);
1172 if (chain
->flags
& NFT_CHAIN_INACTIVE
)
1177 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, chain
, nla
);
1178 err
= nft_trans_chain_add(&ctx
, NFT_MSG_DELCHAIN
);
1183 list_del(&chain
->list
);
1192 * nft_register_expr - register nf_tables expr type
1195 * Registers the expr type for use with nf_tables. Returns zero on
1196 * success or a negative errno code otherwise.
1198 int nft_register_expr(struct nft_expr_type
*type
)
1200 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1201 if (type
->family
== NFPROTO_UNSPEC
)
1202 list_add_tail(&type
->list
, &nf_tables_expressions
);
1204 list_add(&type
->list
, &nf_tables_expressions
);
1205 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1208 EXPORT_SYMBOL_GPL(nft_register_expr
);
1211 * nft_unregister_expr - unregister nf_tables expr type
1214 * Unregisters the expr typefor use with nf_tables.
1216 void nft_unregister_expr(struct nft_expr_type
*type
)
1218 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1219 list_del(&type
->list
);
1220 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1222 EXPORT_SYMBOL_GPL(nft_unregister_expr
);
1224 static const struct nft_expr_type
*__nft_expr_type_get(u8 family
,
1227 const struct nft_expr_type
*type
;
1229 list_for_each_entry(type
, &nf_tables_expressions
, list
) {
1230 if (!nla_strcmp(nla
, type
->name
) &&
1231 (!type
->family
|| type
->family
== family
))
1237 static const struct nft_expr_type
*nft_expr_type_get(u8 family
,
1240 const struct nft_expr_type
*type
;
1243 return ERR_PTR(-EINVAL
);
1245 type
= __nft_expr_type_get(family
, nla
);
1246 if (type
!= NULL
&& try_module_get(type
->owner
))
1249 #ifdef CONFIG_MODULES
1251 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1252 request_module("nft-expr-%u-%.*s", family
,
1253 nla_len(nla
), (char *)nla_data(nla
));
1254 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1255 if (__nft_expr_type_get(family
, nla
))
1256 return ERR_PTR(-EAGAIN
);
1258 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1259 request_module("nft-expr-%.*s",
1260 nla_len(nla
), (char *)nla_data(nla
));
1261 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1262 if (__nft_expr_type_get(family
, nla
))
1263 return ERR_PTR(-EAGAIN
);
1266 return ERR_PTR(-ENOENT
);
1269 static const struct nla_policy nft_expr_policy
[NFTA_EXPR_MAX
+ 1] = {
1270 [NFTA_EXPR_NAME
] = { .type
= NLA_STRING
},
1271 [NFTA_EXPR_DATA
] = { .type
= NLA_NESTED
},
1274 static int nf_tables_fill_expr_info(struct sk_buff
*skb
,
1275 const struct nft_expr
*expr
)
1277 if (nla_put_string(skb
, NFTA_EXPR_NAME
, expr
->ops
->type
->name
))
1278 goto nla_put_failure
;
1280 if (expr
->ops
->dump
) {
1281 struct nlattr
*data
= nla_nest_start(skb
, NFTA_EXPR_DATA
);
1283 goto nla_put_failure
;
1284 if (expr
->ops
->dump(skb
, expr
) < 0)
1285 goto nla_put_failure
;
1286 nla_nest_end(skb
, data
);
1295 struct nft_expr_info
{
1296 const struct nft_expr_ops
*ops
;
1297 struct nlattr
*tb
[NFT_EXPR_MAXATTR
+ 1];
1300 static int nf_tables_expr_parse(const struct nft_ctx
*ctx
,
1301 const struct nlattr
*nla
,
1302 struct nft_expr_info
*info
)
1304 const struct nft_expr_type
*type
;
1305 const struct nft_expr_ops
*ops
;
1306 struct nlattr
*tb
[NFTA_EXPR_MAX
+ 1];
1309 err
= nla_parse_nested(tb
, NFTA_EXPR_MAX
, nla
, nft_expr_policy
);
1313 type
= nft_expr_type_get(ctx
->afi
->family
, tb
[NFTA_EXPR_NAME
]);
1315 return PTR_ERR(type
);
1317 if (tb
[NFTA_EXPR_DATA
]) {
1318 err
= nla_parse_nested(info
->tb
, type
->maxattr
,
1319 tb
[NFTA_EXPR_DATA
], type
->policy
);
1323 memset(info
->tb
, 0, sizeof(info
->tb
[0]) * (type
->maxattr
+ 1));
1325 if (type
->select_ops
!= NULL
) {
1326 ops
= type
->select_ops(ctx
,
1327 (const struct nlattr
* const *)info
->tb
);
1339 module_put(type
->owner
);
1343 static int nf_tables_newexpr(const struct nft_ctx
*ctx
,
1344 const struct nft_expr_info
*info
,
1345 struct nft_expr
*expr
)
1347 const struct nft_expr_ops
*ops
= info
->ops
;
1352 err
= ops
->init(ctx
, expr
, (const struct nlattr
**)info
->tb
);
1364 static void nf_tables_expr_destroy(const struct nft_ctx
*ctx
,
1365 struct nft_expr
*expr
)
1367 if (expr
->ops
->destroy
)
1368 expr
->ops
->destroy(ctx
, expr
);
1369 module_put(expr
->ops
->type
->owner
);
1376 static struct nft_rule
*__nf_tables_rule_lookup(const struct nft_chain
*chain
,
1379 struct nft_rule
*rule
;
1381 // FIXME: this sucks
1382 list_for_each_entry(rule
, &chain
->rules
, list
) {
1383 if (handle
== rule
->handle
)
1387 return ERR_PTR(-ENOENT
);
1390 static struct nft_rule
*nf_tables_rule_lookup(const struct nft_chain
*chain
,
1391 const struct nlattr
*nla
)
1394 return ERR_PTR(-EINVAL
);
1396 return __nf_tables_rule_lookup(chain
, be64_to_cpu(nla_get_be64(nla
)));
1399 static const struct nla_policy nft_rule_policy
[NFTA_RULE_MAX
+ 1] = {
1400 [NFTA_RULE_TABLE
] = { .type
= NLA_STRING
},
1401 [NFTA_RULE_CHAIN
] = { .type
= NLA_STRING
,
1402 .len
= NFT_CHAIN_MAXNAMELEN
- 1 },
1403 [NFTA_RULE_HANDLE
] = { .type
= NLA_U64
},
1404 [NFTA_RULE_EXPRESSIONS
] = { .type
= NLA_NESTED
},
1405 [NFTA_RULE_COMPAT
] = { .type
= NLA_NESTED
},
1406 [NFTA_RULE_POSITION
] = { .type
= NLA_U64
},
1407 [NFTA_RULE_USERDATA
] = { .type
= NLA_BINARY
,
1408 .len
= NFT_USERDATA_MAXLEN
},
1411 static int nf_tables_fill_rule_info(struct sk_buff
*skb
, u32 portid
, u32 seq
,
1412 int event
, u32 flags
, int family
,
1413 const struct nft_table
*table
,
1414 const struct nft_chain
*chain
,
1415 const struct nft_rule
*rule
)
1417 struct nlmsghdr
*nlh
;
1418 struct nfgenmsg
*nfmsg
;
1419 const struct nft_expr
*expr
, *next
;
1420 struct nlattr
*list
;
1421 const struct nft_rule
*prule
;
1422 int type
= event
| NFNL_SUBSYS_NFTABLES
<< 8;
1424 nlh
= nlmsg_put(skb
, portid
, seq
, type
, sizeof(struct nfgenmsg
),
1427 goto nla_put_failure
;
1429 nfmsg
= nlmsg_data(nlh
);
1430 nfmsg
->nfgen_family
= family
;
1431 nfmsg
->version
= NFNETLINK_V0
;
1434 if (nla_put_string(skb
, NFTA_RULE_TABLE
, table
->name
))
1435 goto nla_put_failure
;
1436 if (nla_put_string(skb
, NFTA_RULE_CHAIN
, chain
->name
))
1437 goto nla_put_failure
;
1438 if (nla_put_be64(skb
, NFTA_RULE_HANDLE
, cpu_to_be64(rule
->handle
)))
1439 goto nla_put_failure
;
1441 if ((event
!= NFT_MSG_DELRULE
) && (rule
->list
.prev
!= &chain
->rules
)) {
1442 prule
= list_entry(rule
->list
.prev
, struct nft_rule
, list
);
1443 if (nla_put_be64(skb
, NFTA_RULE_POSITION
,
1444 cpu_to_be64(prule
->handle
)))
1445 goto nla_put_failure
;
1448 list
= nla_nest_start(skb
, NFTA_RULE_EXPRESSIONS
);
1450 goto nla_put_failure
;
1451 nft_rule_for_each_expr(expr
, next
, rule
) {
1452 struct nlattr
*elem
= nla_nest_start(skb
, NFTA_LIST_ELEM
);
1454 goto nla_put_failure
;
1455 if (nf_tables_fill_expr_info(skb
, expr
) < 0)
1456 goto nla_put_failure
;
1457 nla_nest_end(skb
, elem
);
1459 nla_nest_end(skb
, list
);
1462 nla_put(skb
, NFTA_RULE_USERDATA
, rule
->ulen
, nft_userdata(rule
)))
1463 goto nla_put_failure
;
1465 return nlmsg_end(skb
, nlh
);
1468 nlmsg_trim(skb
, nlh
);
1472 static int nf_tables_rule_notify(const struct nft_ctx
*ctx
,
1473 const struct nft_rule
*rule
,
1476 struct sk_buff
*skb
;
1480 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
1484 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
1488 err
= nf_tables_fill_rule_info(skb
, ctx
->portid
, ctx
->seq
, event
, 0,
1489 ctx
->afi
->family
, ctx
->table
,
1496 err
= nfnetlink_send(skb
, ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
1497 ctx
->report
, GFP_KERNEL
);
1500 nfnetlink_set_err(ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
1507 nft_rule_is_active(struct net
*net
, const struct nft_rule
*rule
)
1509 return (rule
->genmask
& (1 << net
->nft
.gencursor
)) == 0;
1512 static inline int gencursor_next(struct net
*net
)
1514 return net
->nft
.gencursor
+1 == 1 ? 1 : 0;
1518 nft_rule_is_active_next(struct net
*net
, const struct nft_rule
*rule
)
1520 return (rule
->genmask
& (1 << gencursor_next(net
))) == 0;
1524 nft_rule_activate_next(struct net
*net
, struct nft_rule
*rule
)
1526 /* Now inactive, will be active in the future */
1527 rule
->genmask
= (1 << net
->nft
.gencursor
);
1531 nft_rule_disactivate_next(struct net
*net
, struct nft_rule
*rule
)
1533 rule
->genmask
= (1 << gencursor_next(net
));
1536 static inline void nft_rule_clear(struct net
*net
, struct nft_rule
*rule
)
1541 static int nf_tables_dump_rules(struct sk_buff
*skb
,
1542 struct netlink_callback
*cb
)
1544 const struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
1545 const struct nft_af_info
*afi
;
1546 const struct nft_table
*table
;
1547 const struct nft_chain
*chain
;
1548 const struct nft_rule
*rule
;
1549 unsigned int idx
= 0, s_idx
= cb
->args
[0];
1550 struct net
*net
= sock_net(skb
->sk
);
1551 int family
= nfmsg
->nfgen_family
;
1552 u8 genctr
= ACCESS_ONCE(net
->nft
.genctr
);
1553 u8 gencursor
= ACCESS_ONCE(net
->nft
.gencursor
);
1555 list_for_each_entry(afi
, &net
->nft
.af_info
, list
) {
1556 if (family
!= NFPROTO_UNSPEC
&& family
!= afi
->family
)
1559 list_for_each_entry(table
, &afi
->tables
, list
) {
1560 list_for_each_entry(chain
, &table
->chains
, list
) {
1561 list_for_each_entry(rule
, &chain
->rules
, list
) {
1562 if (!nft_rule_is_active(net
, rule
))
1567 memset(&cb
->args
[1], 0,
1568 sizeof(cb
->args
) - sizeof(cb
->args
[0]));
1569 if (nf_tables_fill_rule_info(skb
, NETLINK_CB(cb
->skb
).portid
,
1572 NLM_F_MULTI
| NLM_F_APPEND
,
1573 afi
->family
, table
, chain
, rule
) < 0)
1582 /* Invalidate this dump, a transition to the new generation happened */
1583 if (gencursor
!= net
->nft
.gencursor
|| genctr
!= net
->nft
.genctr
)
1590 static int nf_tables_getrule(struct sock
*nlsk
, struct sk_buff
*skb
,
1591 const struct nlmsghdr
*nlh
,
1592 const struct nlattr
* const nla
[])
1594 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1595 const struct nft_af_info
*afi
;
1596 const struct nft_table
*table
;
1597 const struct nft_chain
*chain
;
1598 const struct nft_rule
*rule
;
1599 struct sk_buff
*skb2
;
1600 struct net
*net
= sock_net(skb
->sk
);
1601 int family
= nfmsg
->nfgen_family
;
1604 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1605 struct netlink_dump_control c
= {
1606 .dump
= nf_tables_dump_rules
,
1608 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
1611 afi
= nf_tables_afinfo_lookup(net
, family
, false);
1613 return PTR_ERR(afi
);
1615 table
= nf_tables_table_lookup(afi
, nla
[NFTA_RULE_TABLE
]);
1617 return PTR_ERR(table
);
1618 if (table
->flags
& NFT_TABLE_INACTIVE
)
1621 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_RULE_CHAIN
]);
1623 return PTR_ERR(chain
);
1624 if (chain
->flags
& NFT_CHAIN_INACTIVE
)
1627 rule
= nf_tables_rule_lookup(chain
, nla
[NFTA_RULE_HANDLE
]);
1629 return PTR_ERR(rule
);
1631 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1635 err
= nf_tables_fill_rule_info(skb2
, NETLINK_CB(skb
).portid
,
1636 nlh
->nlmsg_seq
, NFT_MSG_NEWRULE
, 0,
1637 family
, table
, chain
, rule
);
1641 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
1648 static void nf_tables_rule_destroy(const struct nft_ctx
*ctx
,
1649 struct nft_rule
*rule
)
1651 struct nft_expr
*expr
;
1654 * Careful: some expressions might not be initialized in case this
1655 * is called on error from nf_tables_newrule().
1657 expr
= nft_expr_first(rule
);
1658 while (expr
->ops
&& expr
!= nft_expr_last(rule
)) {
1659 nf_tables_expr_destroy(ctx
, expr
);
1660 expr
= nft_expr_next(expr
);
1665 static struct nft_trans
*nft_trans_rule_add(struct nft_ctx
*ctx
, int msg_type
,
1666 struct nft_rule
*rule
)
1668 struct nft_trans
*trans
;
1670 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_rule
));
1674 nft_trans_rule(trans
) = rule
;
1675 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
1680 #define NFT_RULE_MAXEXPRS 128
1682 static struct nft_expr_info
*info
;
1684 static int nf_tables_newrule(struct sock
*nlsk
, struct sk_buff
*skb
,
1685 const struct nlmsghdr
*nlh
,
1686 const struct nlattr
* const nla
[])
1688 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1689 struct nft_af_info
*afi
;
1690 struct net
*net
= sock_net(skb
->sk
);
1691 struct nft_table
*table
;
1692 struct nft_chain
*chain
;
1693 struct nft_rule
*rule
, *old_rule
= NULL
;
1694 struct nft_trans
*trans
= NULL
;
1695 struct nft_expr
*expr
;
1698 unsigned int size
, i
, n
, ulen
= 0;
1701 u64 handle
, pos_handle
;
1703 create
= nlh
->nlmsg_flags
& NLM_F_CREATE
? true : false;
1705 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, create
);
1707 return PTR_ERR(afi
);
1709 table
= nf_tables_table_lookup(afi
, nla
[NFTA_RULE_TABLE
]);
1711 return PTR_ERR(table
);
1713 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_RULE_CHAIN
]);
1715 return PTR_ERR(chain
);
1717 if (nla
[NFTA_RULE_HANDLE
]) {
1718 handle
= be64_to_cpu(nla_get_be64(nla
[NFTA_RULE_HANDLE
]));
1719 rule
= __nf_tables_rule_lookup(chain
, handle
);
1721 return PTR_ERR(rule
);
1723 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
1725 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
1730 if (!create
|| nlh
->nlmsg_flags
& NLM_F_REPLACE
)
1732 handle
= nf_tables_alloc_handle(table
);
1734 if (chain
->use
== UINT_MAX
)
1738 if (nla
[NFTA_RULE_POSITION
]) {
1739 if (!(nlh
->nlmsg_flags
& NLM_F_CREATE
))
1742 pos_handle
= be64_to_cpu(nla_get_be64(nla
[NFTA_RULE_POSITION
]));
1743 old_rule
= __nf_tables_rule_lookup(chain
, pos_handle
);
1744 if (IS_ERR(old_rule
))
1745 return PTR_ERR(old_rule
);
1748 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, chain
, nla
);
1752 if (nla
[NFTA_RULE_EXPRESSIONS
]) {
1753 nla_for_each_nested(tmp
, nla
[NFTA_RULE_EXPRESSIONS
], rem
) {
1755 if (nla_type(tmp
) != NFTA_LIST_ELEM
)
1757 if (n
== NFT_RULE_MAXEXPRS
)
1759 err
= nf_tables_expr_parse(&ctx
, tmp
, &info
[n
]);
1762 size
+= info
[n
].ops
->size
;
1767 if (nla
[NFTA_RULE_USERDATA
])
1768 ulen
= nla_len(nla
[NFTA_RULE_USERDATA
]);
1771 rule
= kzalloc(sizeof(*rule
) + size
+ ulen
, GFP_KERNEL
);
1775 nft_rule_activate_next(net
, rule
);
1777 rule
->handle
= handle
;
1782 nla_memcpy(nft_userdata(rule
), nla
[NFTA_RULE_USERDATA
], ulen
);
1784 expr
= nft_expr_first(rule
);
1785 for (i
= 0; i
< n
; i
++) {
1786 err
= nf_tables_newexpr(&ctx
, &info
[i
], expr
);
1790 expr
= nft_expr_next(expr
);
1793 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
) {
1794 if (nft_rule_is_active_next(net
, old_rule
)) {
1795 trans
= nft_trans_rule_add(&ctx
, NFT_MSG_DELRULE
,
1797 if (trans
== NULL
) {
1801 nft_rule_disactivate_next(net
, old_rule
);
1803 list_add_tail_rcu(&rule
->list
, &old_rule
->list
);
1808 } else if (nlh
->nlmsg_flags
& NLM_F_APPEND
)
1810 list_add_rcu(&rule
->list
, &old_rule
->list
);
1812 list_add_tail_rcu(&rule
->list
, &chain
->rules
);
1815 list_add_tail_rcu(&rule
->list
, &old_rule
->list
);
1817 list_add_rcu(&rule
->list
, &chain
->rules
);
1820 if (nft_trans_rule_add(&ctx
, NFT_MSG_NEWRULE
, rule
) == NULL
) {
1828 list_del_rcu(&rule
->list
);
1830 list_del_rcu(&nft_trans_rule(trans
)->list
);
1831 nft_rule_clear(net
, nft_trans_rule(trans
));
1832 nft_trans_destroy(trans
);
1836 nf_tables_rule_destroy(&ctx
, rule
);
1838 for (i
= 0; i
< n
; i
++) {
1839 if (info
[i
].ops
!= NULL
)
1840 module_put(info
[i
].ops
->type
->owner
);
1846 nf_tables_delrule_one(struct nft_ctx
*ctx
, struct nft_rule
*rule
)
1848 /* You cannot delete the same rule twice */
1849 if (nft_rule_is_active_next(ctx
->net
, rule
)) {
1850 if (nft_trans_rule_add(ctx
, NFT_MSG_DELRULE
, rule
) == NULL
)
1852 nft_rule_disactivate_next(ctx
->net
, rule
);
1859 static int nf_table_delrule_by_chain(struct nft_ctx
*ctx
)
1861 struct nft_rule
*rule
;
1864 list_for_each_entry(rule
, &ctx
->chain
->rules
, list
) {
1865 err
= nf_tables_delrule_one(ctx
, rule
);
1872 static int nf_tables_delrule(struct sock
*nlsk
, struct sk_buff
*skb
,
1873 const struct nlmsghdr
*nlh
,
1874 const struct nlattr
* const nla
[])
1876 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1877 struct nft_af_info
*afi
;
1878 struct net
*net
= sock_net(skb
->sk
);
1879 struct nft_table
*table
;
1880 struct nft_chain
*chain
= NULL
;
1881 struct nft_rule
*rule
;
1882 int family
= nfmsg
->nfgen_family
, err
= 0;
1885 afi
= nf_tables_afinfo_lookup(net
, family
, false);
1887 return PTR_ERR(afi
);
1889 table
= nf_tables_table_lookup(afi
, nla
[NFTA_RULE_TABLE
]);
1891 return PTR_ERR(table
);
1892 if (table
->flags
& NFT_TABLE_INACTIVE
)
1895 if (nla
[NFTA_RULE_CHAIN
]) {
1896 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_RULE_CHAIN
]);
1898 return PTR_ERR(chain
);
1901 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, chain
, nla
);
1904 if (nla
[NFTA_RULE_HANDLE
]) {
1905 rule
= nf_tables_rule_lookup(chain
,
1906 nla
[NFTA_RULE_HANDLE
]);
1908 return PTR_ERR(rule
);
1910 err
= nf_tables_delrule_one(&ctx
, rule
);
1912 err
= nf_table_delrule_by_chain(&ctx
);
1915 list_for_each_entry(chain
, &table
->chains
, list
) {
1917 err
= nf_table_delrule_by_chain(&ctx
);
1930 static LIST_HEAD(nf_tables_set_ops
);
1932 int nft_register_set(struct nft_set_ops
*ops
)
1934 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1935 list_add_tail(&ops
->list
, &nf_tables_set_ops
);
1936 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1939 EXPORT_SYMBOL_GPL(nft_register_set
);
1941 void nft_unregister_set(struct nft_set_ops
*ops
)
1943 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1944 list_del(&ops
->list
);
1945 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1947 EXPORT_SYMBOL_GPL(nft_unregister_set
);
1950 * Select a set implementation based on the data characteristics and the
1951 * given policy. The total memory use might not be known if no size is
1952 * given, in that case the amount of memory per element is used.
1954 static const struct nft_set_ops
*
1955 nft_select_set_ops(const struct nlattr
* const nla
[],
1956 const struct nft_set_desc
*desc
,
1957 enum nft_set_policies policy
)
1959 const struct nft_set_ops
*ops
, *bops
;
1960 struct nft_set_estimate est
, best
;
1963 #ifdef CONFIG_MODULES
1964 if (list_empty(&nf_tables_set_ops
)) {
1965 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1966 request_module("nft-set");
1967 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1968 if (!list_empty(&nf_tables_set_ops
))
1969 return ERR_PTR(-EAGAIN
);
1973 if (nla
[NFTA_SET_FLAGS
] != NULL
) {
1974 features
= ntohl(nla_get_be32(nla
[NFTA_SET_FLAGS
]));
1975 features
&= NFT_SET_INTERVAL
| NFT_SET_MAP
;
1982 list_for_each_entry(ops
, &nf_tables_set_ops
, list
) {
1983 if ((ops
->features
& features
) != features
)
1985 if (!ops
->estimate(desc
, features
, &est
))
1989 case NFT_SET_POL_PERFORMANCE
:
1990 if (est
.class < best
.class)
1992 if (est
.class == best
.class && est
.size
< best
.size
)
1995 case NFT_SET_POL_MEMORY
:
1996 if (est
.size
< best
.size
)
1998 if (est
.size
== best
.size
&& est
.class < best
.class)
2005 if (!try_module_get(ops
->owner
))
2008 module_put(bops
->owner
);
2017 return ERR_PTR(-EOPNOTSUPP
);
2020 static const struct nla_policy nft_set_policy
[NFTA_SET_MAX
+ 1] = {
2021 [NFTA_SET_TABLE
] = { .type
= NLA_STRING
},
2022 [NFTA_SET_NAME
] = { .type
= NLA_STRING
,
2023 .len
= IFNAMSIZ
- 1 },
2024 [NFTA_SET_FLAGS
] = { .type
= NLA_U32
},
2025 [NFTA_SET_KEY_TYPE
] = { .type
= NLA_U32
},
2026 [NFTA_SET_KEY_LEN
] = { .type
= NLA_U32
},
2027 [NFTA_SET_DATA_TYPE
] = { .type
= NLA_U32
},
2028 [NFTA_SET_DATA_LEN
] = { .type
= NLA_U32
},
2029 [NFTA_SET_POLICY
] = { .type
= NLA_U32
},
2030 [NFTA_SET_DESC
] = { .type
= NLA_NESTED
},
2031 [NFTA_SET_ID
] = { .type
= NLA_U32
},
2034 static const struct nla_policy nft_set_desc_policy
[NFTA_SET_DESC_MAX
+ 1] = {
2035 [NFTA_SET_DESC_SIZE
] = { .type
= NLA_U32
},
2038 static int nft_ctx_init_from_setattr(struct nft_ctx
*ctx
,
2039 const struct sk_buff
*skb
,
2040 const struct nlmsghdr
*nlh
,
2041 const struct nlattr
* const nla
[])
2043 struct net
*net
= sock_net(skb
->sk
);
2044 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2045 struct nft_af_info
*afi
= NULL
;
2046 struct nft_table
*table
= NULL
;
2048 if (nfmsg
->nfgen_family
!= NFPROTO_UNSPEC
) {
2049 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, false);
2051 return PTR_ERR(afi
);
2054 if (nla
[NFTA_SET_TABLE
] != NULL
) {
2056 return -EAFNOSUPPORT
;
2058 table
= nf_tables_table_lookup(afi
, nla
[NFTA_SET_TABLE
]);
2060 return PTR_ERR(table
);
2061 if (table
->flags
& NFT_TABLE_INACTIVE
)
2065 nft_ctx_init(ctx
, skb
, nlh
, afi
, table
, NULL
, nla
);
2069 struct nft_set
*nf_tables_set_lookup(const struct nft_table
*table
,
2070 const struct nlattr
*nla
)
2072 struct nft_set
*set
;
2075 return ERR_PTR(-EINVAL
);
2077 list_for_each_entry(set
, &table
->sets
, list
) {
2078 if (!nla_strcmp(nla
, set
->name
))
2081 return ERR_PTR(-ENOENT
);
2084 struct nft_set
*nf_tables_set_lookup_byid(const struct net
*net
,
2085 const struct nlattr
*nla
)
2087 struct nft_trans
*trans
;
2088 u32 id
= ntohl(nla_get_be32(nla
));
2090 list_for_each_entry(trans
, &net
->nft
.commit_list
, list
) {
2091 if (trans
->msg_type
== NFT_MSG_NEWSET
&&
2092 id
== nft_trans_set_id(trans
))
2093 return nft_trans_set(trans
);
2095 return ERR_PTR(-ENOENT
);
2098 static int nf_tables_set_alloc_name(struct nft_ctx
*ctx
, struct nft_set
*set
,
2101 const struct nft_set
*i
;
2103 unsigned long *inuse
;
2104 unsigned int n
= 0, min
= 0;
2106 p
= strnchr(name
, IFNAMSIZ
, '%');
2108 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
2111 inuse
= (unsigned long *)get_zeroed_page(GFP_KERNEL
);
2115 list_for_each_entry(i
, &ctx
->table
->sets
, list
) {
2118 if (!sscanf(i
->name
, name
, &tmp
))
2120 if (tmp
< min
|| tmp
>= min
+ BITS_PER_BYTE
* PAGE_SIZE
)
2123 set_bit(tmp
- min
, inuse
);
2126 n
= find_first_zero_bit(inuse
, BITS_PER_BYTE
* PAGE_SIZE
);
2127 if (n
>= BITS_PER_BYTE
* PAGE_SIZE
) {
2128 min
+= BITS_PER_BYTE
* PAGE_SIZE
;
2129 memset(inuse
, 0, PAGE_SIZE
);
2132 free_page((unsigned long)inuse
);
2135 snprintf(set
->name
, sizeof(set
->name
), name
, min
+ n
);
2136 list_for_each_entry(i
, &ctx
->table
->sets
, list
) {
2137 if (!strcmp(set
->name
, i
->name
))
2143 static int nf_tables_fill_set(struct sk_buff
*skb
, const struct nft_ctx
*ctx
,
2144 const struct nft_set
*set
, u16 event
, u16 flags
)
2146 struct nfgenmsg
*nfmsg
;
2147 struct nlmsghdr
*nlh
;
2148 struct nlattr
*desc
;
2149 u32 portid
= ctx
->portid
;
2152 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
2153 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
),
2156 goto nla_put_failure
;
2158 nfmsg
= nlmsg_data(nlh
);
2159 nfmsg
->nfgen_family
= ctx
->afi
->family
;
2160 nfmsg
->version
= NFNETLINK_V0
;
2163 if (nla_put_string(skb
, NFTA_SET_TABLE
, ctx
->table
->name
))
2164 goto nla_put_failure
;
2165 if (nla_put_string(skb
, NFTA_SET_NAME
, set
->name
))
2166 goto nla_put_failure
;
2167 if (set
->flags
!= 0)
2168 if (nla_put_be32(skb
, NFTA_SET_FLAGS
, htonl(set
->flags
)))
2169 goto nla_put_failure
;
2171 if (nla_put_be32(skb
, NFTA_SET_KEY_TYPE
, htonl(set
->ktype
)))
2172 goto nla_put_failure
;
2173 if (nla_put_be32(skb
, NFTA_SET_KEY_LEN
, htonl(set
->klen
)))
2174 goto nla_put_failure
;
2175 if (set
->flags
& NFT_SET_MAP
) {
2176 if (nla_put_be32(skb
, NFTA_SET_DATA_TYPE
, htonl(set
->dtype
)))
2177 goto nla_put_failure
;
2178 if (nla_put_be32(skb
, NFTA_SET_DATA_LEN
, htonl(set
->dlen
)))
2179 goto nla_put_failure
;
2182 desc
= nla_nest_start(skb
, NFTA_SET_DESC
);
2184 goto nla_put_failure
;
2186 nla_put_be32(skb
, NFTA_SET_DESC_SIZE
, htonl(set
->size
)))
2187 goto nla_put_failure
;
2188 nla_nest_end(skb
, desc
);
2190 return nlmsg_end(skb
, nlh
);
2193 nlmsg_trim(skb
, nlh
);
2197 static int nf_tables_set_notify(const struct nft_ctx
*ctx
,
2198 const struct nft_set
*set
,
2199 int event
, gfp_t gfp_flags
)
2201 struct sk_buff
*skb
;
2202 u32 portid
= ctx
->portid
;
2206 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
2210 skb
= nlmsg_new(NLMSG_GOODSIZE
, gfp_flags
);
2214 err
= nf_tables_fill_set(skb
, ctx
, set
, event
, 0);
2220 err
= nfnetlink_send(skb
, ctx
->net
, portid
, NFNLGRP_NFTABLES
,
2221 ctx
->report
, gfp_flags
);
2224 nfnetlink_set_err(ctx
->net
, portid
, NFNLGRP_NFTABLES
, err
);
2228 static int nf_tables_dump_sets_table(struct nft_ctx
*ctx
, struct sk_buff
*skb
,
2229 struct netlink_callback
*cb
)
2231 const struct nft_set
*set
;
2232 unsigned int idx
= 0, s_idx
= cb
->args
[0];
2237 list_for_each_entry(set
, &ctx
->table
->sets
, list
) {
2240 if (nf_tables_fill_set(skb
, ctx
, set
, NFT_MSG_NEWSET
,
2253 static int nf_tables_dump_sets_family(struct nft_ctx
*ctx
, struct sk_buff
*skb
,
2254 struct netlink_callback
*cb
)
2256 const struct nft_set
*set
;
2257 unsigned int idx
, s_idx
= cb
->args
[0];
2258 struct nft_table
*table
, *cur_table
= (struct nft_table
*)cb
->args
[2];
2263 list_for_each_entry(table
, &ctx
->afi
->tables
, list
) {
2265 if (cur_table
!= table
)
2272 list_for_each_entry(set
, &ctx
->table
->sets
, list
) {
2275 if (nf_tables_fill_set(skb
, ctx
, set
, NFT_MSG_NEWSET
,
2278 cb
->args
[2] = (unsigned long) table
;
2290 static int nf_tables_dump_sets_all(struct nft_ctx
*ctx
, struct sk_buff
*skb
,
2291 struct netlink_callback
*cb
)
2293 const struct nft_set
*set
;
2294 unsigned int idx
, s_idx
= cb
->args
[0];
2295 struct nft_af_info
*afi
;
2296 struct nft_table
*table
, *cur_table
= (struct nft_table
*)cb
->args
[2];
2297 struct net
*net
= sock_net(skb
->sk
);
2298 int cur_family
= cb
->args
[3];
2303 list_for_each_entry(afi
, &net
->nft
.af_info
, list
) {
2305 if (afi
->family
!= cur_family
)
2311 list_for_each_entry(table
, &afi
->tables
, list
) {
2313 if (cur_table
!= table
)
2322 list_for_each_entry(set
, &ctx
->table
->sets
, list
) {
2325 if (nf_tables_fill_set(skb
, ctx
, set
,
2329 cb
->args
[2] = (unsigned long) table
;
2330 cb
->args
[3] = afi
->family
;
2345 static int nf_tables_dump_sets(struct sk_buff
*skb
, struct netlink_callback
*cb
)
2347 const struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
2348 struct nlattr
*nla
[NFTA_SET_MAX
+ 1];
2352 err
= nlmsg_parse(cb
->nlh
, sizeof(*nfmsg
), nla
, NFTA_SET_MAX
,
2357 err
= nft_ctx_init_from_setattr(&ctx
, cb
->skb
, cb
->nlh
, (void *)nla
);
2361 if (ctx
.table
== NULL
) {
2362 if (ctx
.afi
== NULL
)
2363 ret
= nf_tables_dump_sets_all(&ctx
, skb
, cb
);
2365 ret
= nf_tables_dump_sets_family(&ctx
, skb
, cb
);
2367 ret
= nf_tables_dump_sets_table(&ctx
, skb
, cb
);
2372 #define NFT_SET_INACTIVE (1 << 15) /* Internal set flag */
2374 static int nf_tables_getset(struct sock
*nlsk
, struct sk_buff
*skb
,
2375 const struct nlmsghdr
*nlh
,
2376 const struct nlattr
* const nla
[])
2378 const struct nft_set
*set
;
2380 struct sk_buff
*skb2
;
2381 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2384 /* Verify existance before starting dump */
2385 err
= nft_ctx_init_from_setattr(&ctx
, skb
, nlh
, nla
);
2389 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
2390 struct netlink_dump_control c
= {
2391 .dump
= nf_tables_dump_sets
,
2393 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
2396 /* Only accept unspec with dump */
2397 if (nfmsg
->nfgen_family
== NFPROTO_UNSPEC
)
2398 return -EAFNOSUPPORT
;
2400 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_NAME
]);
2402 return PTR_ERR(set
);
2403 if (set
->flags
& NFT_SET_INACTIVE
)
2406 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
2410 err
= nf_tables_fill_set(skb2
, &ctx
, set
, NFT_MSG_NEWSET
, 0);
2414 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
2421 static int nf_tables_set_desc_parse(const struct nft_ctx
*ctx
,
2422 struct nft_set_desc
*desc
,
2423 const struct nlattr
*nla
)
2425 struct nlattr
*da
[NFTA_SET_DESC_MAX
+ 1];
2428 err
= nla_parse_nested(da
, NFTA_SET_DESC_MAX
, nla
, nft_set_desc_policy
);
2432 if (da
[NFTA_SET_DESC_SIZE
] != NULL
)
2433 desc
->size
= ntohl(nla_get_be32(da
[NFTA_SET_DESC_SIZE
]));
2438 static int nft_trans_set_add(struct nft_ctx
*ctx
, int msg_type
,
2439 struct nft_set
*set
)
2441 struct nft_trans
*trans
;
2443 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_set
));
2447 if (msg_type
== NFT_MSG_NEWSET
&& ctx
->nla
[NFTA_SET_ID
] != NULL
) {
2448 nft_trans_set_id(trans
) =
2449 ntohl(nla_get_be32(ctx
->nla
[NFTA_SET_ID
]));
2450 set
->flags
|= NFT_SET_INACTIVE
;
2452 nft_trans_set(trans
) = set
;
2453 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
2458 static int nf_tables_newset(struct sock
*nlsk
, struct sk_buff
*skb
,
2459 const struct nlmsghdr
*nlh
,
2460 const struct nlattr
* const nla
[])
2462 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2463 const struct nft_set_ops
*ops
;
2464 struct nft_af_info
*afi
;
2465 struct net
*net
= sock_net(skb
->sk
);
2466 struct nft_table
*table
;
2467 struct nft_set
*set
;
2469 char name
[IFNAMSIZ
];
2472 u32 ktype
, dtype
, flags
, policy
;
2473 struct nft_set_desc desc
;
2476 if (nla
[NFTA_SET_TABLE
] == NULL
||
2477 nla
[NFTA_SET_NAME
] == NULL
||
2478 nla
[NFTA_SET_KEY_LEN
] == NULL
||
2479 nla
[NFTA_SET_ID
] == NULL
)
2482 memset(&desc
, 0, sizeof(desc
));
2484 ktype
= NFT_DATA_VALUE
;
2485 if (nla
[NFTA_SET_KEY_TYPE
] != NULL
) {
2486 ktype
= ntohl(nla_get_be32(nla
[NFTA_SET_KEY_TYPE
]));
2487 if ((ktype
& NFT_DATA_RESERVED_MASK
) == NFT_DATA_RESERVED_MASK
)
2491 desc
.klen
= ntohl(nla_get_be32(nla
[NFTA_SET_KEY_LEN
]));
2492 if (desc
.klen
== 0 || desc
.klen
> FIELD_SIZEOF(struct nft_data
, data
))
2496 if (nla
[NFTA_SET_FLAGS
] != NULL
) {
2497 flags
= ntohl(nla_get_be32(nla
[NFTA_SET_FLAGS
]));
2498 if (flags
& ~(NFT_SET_ANONYMOUS
| NFT_SET_CONSTANT
|
2499 NFT_SET_INTERVAL
| NFT_SET_MAP
))
2504 if (nla
[NFTA_SET_DATA_TYPE
] != NULL
) {
2505 if (!(flags
& NFT_SET_MAP
))
2508 dtype
= ntohl(nla_get_be32(nla
[NFTA_SET_DATA_TYPE
]));
2509 if ((dtype
& NFT_DATA_RESERVED_MASK
) == NFT_DATA_RESERVED_MASK
&&
2510 dtype
!= NFT_DATA_VERDICT
)
2513 if (dtype
!= NFT_DATA_VERDICT
) {
2514 if (nla
[NFTA_SET_DATA_LEN
] == NULL
)
2516 desc
.dlen
= ntohl(nla_get_be32(nla
[NFTA_SET_DATA_LEN
]));
2517 if (desc
.dlen
== 0 ||
2518 desc
.dlen
> FIELD_SIZEOF(struct nft_data
, data
))
2521 desc
.dlen
= sizeof(struct nft_data
);
2522 } else if (flags
& NFT_SET_MAP
)
2525 policy
= NFT_SET_POL_PERFORMANCE
;
2526 if (nla
[NFTA_SET_POLICY
] != NULL
)
2527 policy
= ntohl(nla_get_be32(nla
[NFTA_SET_POLICY
]));
2529 if (nla
[NFTA_SET_DESC
] != NULL
) {
2530 err
= nf_tables_set_desc_parse(&ctx
, &desc
, nla
[NFTA_SET_DESC
]);
2535 create
= nlh
->nlmsg_flags
& NLM_F_CREATE
? true : false;
2537 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, create
);
2539 return PTR_ERR(afi
);
2541 table
= nf_tables_table_lookup(afi
, nla
[NFTA_SET_TABLE
]);
2543 return PTR_ERR(table
);
2545 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, NULL
, nla
);
2547 set
= nf_tables_set_lookup(table
, nla
[NFTA_SET_NAME
]);
2549 if (PTR_ERR(set
) != -ENOENT
)
2550 return PTR_ERR(set
);
2555 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
2557 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
2562 if (!(nlh
->nlmsg_flags
& NLM_F_CREATE
))
2565 ops
= nft_select_set_ops(nla
, &desc
, policy
);
2567 return PTR_ERR(ops
);
2570 if (ops
->privsize
!= NULL
)
2571 size
= ops
->privsize(nla
);
2574 set
= kzalloc(sizeof(*set
) + size
, GFP_KERNEL
);
2578 nla_strlcpy(name
, nla
[NFTA_SET_NAME
], sizeof(set
->name
));
2579 err
= nf_tables_set_alloc_name(&ctx
, set
, name
);
2583 INIT_LIST_HEAD(&set
->bindings
);
2586 set
->klen
= desc
.klen
;
2588 set
->dlen
= desc
.dlen
;
2590 set
->size
= desc
.size
;
2592 err
= ops
->init(set
, &desc
, nla
);
2596 err
= nft_trans_set_add(&ctx
, NFT_MSG_NEWSET
, set
);
2600 list_add_tail(&set
->list
, &table
->sets
);
2607 module_put(ops
->owner
);
2611 static void nft_set_destroy(struct nft_set
*set
)
2613 set
->ops
->destroy(set
);
2614 module_put(set
->ops
->owner
);
2618 static void nf_tables_set_destroy(const struct nft_ctx
*ctx
, struct nft_set
*set
)
2620 list_del(&set
->list
);
2621 nf_tables_set_notify(ctx
, set
, NFT_MSG_DELSET
, GFP_ATOMIC
);
2622 nft_set_destroy(set
);
2625 static int nf_tables_delset(struct sock
*nlsk
, struct sk_buff
*skb
,
2626 const struct nlmsghdr
*nlh
,
2627 const struct nlattr
* const nla
[])
2629 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2630 struct nft_set
*set
;
2634 if (nfmsg
->nfgen_family
== NFPROTO_UNSPEC
)
2635 return -EAFNOSUPPORT
;
2636 if (nla
[NFTA_SET_TABLE
] == NULL
)
2639 err
= nft_ctx_init_from_setattr(&ctx
, skb
, nlh
, nla
);
2643 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_NAME
]);
2645 return PTR_ERR(set
);
2646 if (set
->flags
& NFT_SET_INACTIVE
)
2648 if (!list_empty(&set
->bindings
))
2651 err
= nft_trans_set_add(&ctx
, NFT_MSG_DELSET
, set
);
2655 list_del(&set
->list
);
2660 static int nf_tables_bind_check_setelem(const struct nft_ctx
*ctx
,
2661 const struct nft_set
*set
,
2662 const struct nft_set_iter
*iter
,
2663 const struct nft_set_elem
*elem
)
2665 enum nft_registers dreg
;
2667 dreg
= nft_type_to_reg(set
->dtype
);
2668 return nft_validate_data_load(ctx
, dreg
, &elem
->data
,
2669 set
->dtype
== NFT_DATA_VERDICT
?
2670 NFT_DATA_VERDICT
: NFT_DATA_VALUE
);
2673 int nf_tables_bind_set(const struct nft_ctx
*ctx
, struct nft_set
*set
,
2674 struct nft_set_binding
*binding
)
2676 struct nft_set_binding
*i
;
2677 struct nft_set_iter iter
;
2679 if (!list_empty(&set
->bindings
) && set
->flags
& NFT_SET_ANONYMOUS
)
2682 if (set
->flags
& NFT_SET_MAP
) {
2683 /* If the set is already bound to the same chain all
2684 * jumps are already validated for that chain.
2686 list_for_each_entry(i
, &set
->bindings
, list
) {
2687 if (i
->chain
== binding
->chain
)
2694 iter
.fn
= nf_tables_bind_check_setelem
;
2696 set
->ops
->walk(ctx
, set
, &iter
);
2698 /* Destroy anonymous sets if binding fails */
2699 if (set
->flags
& NFT_SET_ANONYMOUS
)
2700 nf_tables_set_destroy(ctx
, set
);
2706 binding
->chain
= ctx
->chain
;
2707 list_add_tail(&binding
->list
, &set
->bindings
);
2711 void nf_tables_unbind_set(const struct nft_ctx
*ctx
, struct nft_set
*set
,
2712 struct nft_set_binding
*binding
)
2714 list_del(&binding
->list
);
2716 if (list_empty(&set
->bindings
) && set
->flags
& NFT_SET_ANONYMOUS
&&
2717 !(set
->flags
& NFT_SET_INACTIVE
))
2718 nf_tables_set_destroy(ctx
, set
);
2725 static const struct nla_policy nft_set_elem_policy
[NFTA_SET_ELEM_MAX
+ 1] = {
2726 [NFTA_SET_ELEM_KEY
] = { .type
= NLA_NESTED
},
2727 [NFTA_SET_ELEM_DATA
] = { .type
= NLA_NESTED
},
2728 [NFTA_SET_ELEM_FLAGS
] = { .type
= NLA_U32
},
2731 static const struct nla_policy nft_set_elem_list_policy
[NFTA_SET_ELEM_LIST_MAX
+ 1] = {
2732 [NFTA_SET_ELEM_LIST_TABLE
] = { .type
= NLA_STRING
},
2733 [NFTA_SET_ELEM_LIST_SET
] = { .type
= NLA_STRING
},
2734 [NFTA_SET_ELEM_LIST_ELEMENTS
] = { .type
= NLA_NESTED
},
2735 [NFTA_SET_ELEM_LIST_SET_ID
] = { .type
= NLA_U32
},
2738 static int nft_ctx_init_from_elemattr(struct nft_ctx
*ctx
,
2739 const struct sk_buff
*skb
,
2740 const struct nlmsghdr
*nlh
,
2741 const struct nlattr
* const nla
[],
2744 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2745 struct nft_af_info
*afi
;
2746 struct nft_table
*table
;
2747 struct net
*net
= sock_net(skb
->sk
);
2749 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, false);
2751 return PTR_ERR(afi
);
2753 table
= nf_tables_table_lookup(afi
, nla
[NFTA_SET_ELEM_LIST_TABLE
]);
2755 return PTR_ERR(table
);
2756 if (!trans
&& (table
->flags
& NFT_TABLE_INACTIVE
))
2759 nft_ctx_init(ctx
, skb
, nlh
, afi
, table
, NULL
, nla
);
2763 static int nf_tables_fill_setelem(struct sk_buff
*skb
,
2764 const struct nft_set
*set
,
2765 const struct nft_set_elem
*elem
)
2767 unsigned char *b
= skb_tail_pointer(skb
);
2768 struct nlattr
*nest
;
2770 nest
= nla_nest_start(skb
, NFTA_LIST_ELEM
);
2772 goto nla_put_failure
;
2774 if (nft_data_dump(skb
, NFTA_SET_ELEM_KEY
, &elem
->key
, NFT_DATA_VALUE
,
2776 goto nla_put_failure
;
2778 if (set
->flags
& NFT_SET_MAP
&&
2779 !(elem
->flags
& NFT_SET_ELEM_INTERVAL_END
) &&
2780 nft_data_dump(skb
, NFTA_SET_ELEM_DATA
, &elem
->data
,
2781 set
->dtype
== NFT_DATA_VERDICT
? NFT_DATA_VERDICT
: NFT_DATA_VALUE
,
2783 goto nla_put_failure
;
2785 if (elem
->flags
!= 0)
2786 if (nla_put_be32(skb
, NFTA_SET_ELEM_FLAGS
, htonl(elem
->flags
)))
2787 goto nla_put_failure
;
2789 nla_nest_end(skb
, nest
);
2797 struct nft_set_dump_args
{
2798 const struct netlink_callback
*cb
;
2799 struct nft_set_iter iter
;
2800 struct sk_buff
*skb
;
2803 static int nf_tables_dump_setelem(const struct nft_ctx
*ctx
,
2804 const struct nft_set
*set
,
2805 const struct nft_set_iter
*iter
,
2806 const struct nft_set_elem
*elem
)
2808 struct nft_set_dump_args
*args
;
2810 args
= container_of(iter
, struct nft_set_dump_args
, iter
);
2811 return nf_tables_fill_setelem(args
->skb
, set
, elem
);
2814 static int nf_tables_dump_set(struct sk_buff
*skb
, struct netlink_callback
*cb
)
2816 const struct nft_set
*set
;
2817 struct nft_set_dump_args args
;
2819 struct nlattr
*nla
[NFTA_SET_ELEM_LIST_MAX
+ 1];
2820 struct nfgenmsg
*nfmsg
;
2821 struct nlmsghdr
*nlh
;
2822 struct nlattr
*nest
;
2826 err
= nlmsg_parse(cb
->nlh
, sizeof(struct nfgenmsg
), nla
,
2827 NFTA_SET_ELEM_LIST_MAX
, nft_set_elem_list_policy
);
2831 err
= nft_ctx_init_from_elemattr(&ctx
, cb
->skb
, cb
->nlh
, (void *)nla
,
2836 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
]);
2838 return PTR_ERR(set
);
2839 if (set
->flags
& NFT_SET_INACTIVE
)
2842 event
= NFT_MSG_NEWSETELEM
;
2843 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
2844 portid
= NETLINK_CB(cb
->skb
).portid
;
2845 seq
= cb
->nlh
->nlmsg_seq
;
2847 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
),
2850 goto nla_put_failure
;
2852 nfmsg
= nlmsg_data(nlh
);
2853 nfmsg
->nfgen_family
= ctx
.afi
->family
;
2854 nfmsg
->version
= NFNETLINK_V0
;
2857 if (nla_put_string(skb
, NFTA_SET_ELEM_LIST_TABLE
, ctx
.table
->name
))
2858 goto nla_put_failure
;
2859 if (nla_put_string(skb
, NFTA_SET_ELEM_LIST_SET
, set
->name
))
2860 goto nla_put_failure
;
2862 nest
= nla_nest_start(skb
, NFTA_SET_ELEM_LIST_ELEMENTS
);
2864 goto nla_put_failure
;
2868 args
.iter
.skip
= cb
->args
[0];
2869 args
.iter
.count
= 0;
2871 args
.iter
.fn
= nf_tables_dump_setelem
;
2872 set
->ops
->walk(&ctx
, set
, &args
.iter
);
2874 nla_nest_end(skb
, nest
);
2875 nlmsg_end(skb
, nlh
);
2877 if (args
.iter
.err
&& args
.iter
.err
!= -EMSGSIZE
)
2878 return args
.iter
.err
;
2879 if (args
.iter
.count
== cb
->args
[0])
2882 cb
->args
[0] = args
.iter
.count
;
2889 static int nf_tables_getsetelem(struct sock
*nlsk
, struct sk_buff
*skb
,
2890 const struct nlmsghdr
*nlh
,
2891 const struct nlattr
* const nla
[])
2893 const struct nft_set
*set
;
2897 err
= nft_ctx_init_from_elemattr(&ctx
, skb
, nlh
, nla
, false);
2901 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
]);
2903 return PTR_ERR(set
);
2904 if (set
->flags
& NFT_SET_INACTIVE
)
2907 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
2908 struct netlink_dump_control c
= {
2909 .dump
= nf_tables_dump_set
,
2911 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
2916 static int nf_tables_fill_setelem_info(struct sk_buff
*skb
,
2917 const struct nft_ctx
*ctx
, u32 seq
,
2918 u32 portid
, int event
, u16 flags
,
2919 const struct nft_set
*set
,
2920 const struct nft_set_elem
*elem
)
2922 struct nfgenmsg
*nfmsg
;
2923 struct nlmsghdr
*nlh
;
2924 struct nlattr
*nest
;
2927 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
2928 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
),
2931 goto nla_put_failure
;
2933 nfmsg
= nlmsg_data(nlh
);
2934 nfmsg
->nfgen_family
= ctx
->afi
->family
;
2935 nfmsg
->version
= NFNETLINK_V0
;
2938 if (nla_put_string(skb
, NFTA_SET_TABLE
, ctx
->table
->name
))
2939 goto nla_put_failure
;
2940 if (nla_put_string(skb
, NFTA_SET_NAME
, set
->name
))
2941 goto nla_put_failure
;
2943 nest
= nla_nest_start(skb
, NFTA_SET_ELEM_LIST_ELEMENTS
);
2945 goto nla_put_failure
;
2947 err
= nf_tables_fill_setelem(skb
, set
, elem
);
2949 goto nla_put_failure
;
2951 nla_nest_end(skb
, nest
);
2953 return nlmsg_end(skb
, nlh
);
2956 nlmsg_trim(skb
, nlh
);
2960 static int nf_tables_setelem_notify(const struct nft_ctx
*ctx
,
2961 const struct nft_set
*set
,
2962 const struct nft_set_elem
*elem
,
2963 int event
, u16 flags
)
2965 struct net
*net
= ctx
->net
;
2966 u32 portid
= ctx
->portid
;
2967 struct sk_buff
*skb
;
2970 if (!ctx
->report
&& !nfnetlink_has_listeners(net
, NFNLGRP_NFTABLES
))
2974 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
2978 err
= nf_tables_fill_setelem_info(skb
, ctx
, 0, portid
, event
, flags
,
2985 err
= nfnetlink_send(skb
, net
, portid
, NFNLGRP_NFTABLES
, ctx
->report
,
2989 nfnetlink_set_err(net
, portid
, NFNLGRP_NFTABLES
, err
);
2993 static struct nft_trans
*nft_trans_elem_alloc(struct nft_ctx
*ctx
,
2995 struct nft_set
*set
)
2997 struct nft_trans
*trans
;
2999 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_elem
));
3003 nft_trans_elem_set(trans
) = set
;
3007 static int nft_add_set_elem(struct nft_ctx
*ctx
, struct nft_set
*set
,
3008 const struct nlattr
*attr
)
3010 struct nlattr
*nla
[NFTA_SET_ELEM_MAX
+ 1];
3011 struct nft_data_desc d1
, d2
;
3012 struct nft_set_elem elem
;
3013 struct nft_set_binding
*binding
;
3014 enum nft_registers dreg
;
3015 struct nft_trans
*trans
;
3018 if (set
->size
&& set
->nelems
== set
->size
)
3021 err
= nla_parse_nested(nla
, NFTA_SET_ELEM_MAX
, attr
,
3022 nft_set_elem_policy
);
3026 if (nla
[NFTA_SET_ELEM_KEY
] == NULL
)
3030 if (nla
[NFTA_SET_ELEM_FLAGS
] != NULL
) {
3031 elem
.flags
= ntohl(nla_get_be32(nla
[NFTA_SET_ELEM_FLAGS
]));
3032 if (elem
.flags
& ~NFT_SET_ELEM_INTERVAL_END
)
3036 if (set
->flags
& NFT_SET_MAP
) {
3037 if (nla
[NFTA_SET_ELEM_DATA
] == NULL
&&
3038 !(elem
.flags
& NFT_SET_ELEM_INTERVAL_END
))
3040 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
&&
3041 elem
.flags
& NFT_SET_ELEM_INTERVAL_END
)
3044 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
)
3048 err
= nft_data_init(ctx
, &elem
.key
, &d1
, nla
[NFTA_SET_ELEM_KEY
]);
3052 if (d1
.type
!= NFT_DATA_VALUE
|| d1
.len
!= set
->klen
)
3056 if (set
->ops
->get(set
, &elem
) == 0)
3059 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
) {
3060 err
= nft_data_init(ctx
, &elem
.data
, &d2
, nla
[NFTA_SET_ELEM_DATA
]);
3065 if (set
->dtype
!= NFT_DATA_VERDICT
&& d2
.len
!= set
->dlen
)
3068 dreg
= nft_type_to_reg(set
->dtype
);
3069 list_for_each_entry(binding
, &set
->bindings
, list
) {
3070 struct nft_ctx bind_ctx
= {
3072 .table
= ctx
->table
,
3073 .chain
= (struct nft_chain
*)binding
->chain
,
3076 err
= nft_validate_data_load(&bind_ctx
, dreg
,
3077 &elem
.data
, d2
.type
);
3083 trans
= nft_trans_elem_alloc(ctx
, NFT_MSG_NEWSETELEM
, set
);
3087 err
= set
->ops
->insert(set
, &elem
);
3091 nft_trans_elem(trans
) = elem
;
3092 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
3098 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
)
3099 nft_data_uninit(&elem
.data
, d2
.type
);
3101 nft_data_uninit(&elem
.key
, d1
.type
);
3106 static int nf_tables_newsetelem(struct sock
*nlsk
, struct sk_buff
*skb
,
3107 const struct nlmsghdr
*nlh
,
3108 const struct nlattr
* const nla
[])
3110 struct net
*net
= sock_net(skb
->sk
);
3111 const struct nlattr
*attr
;
3112 struct nft_set
*set
;
3116 err
= nft_ctx_init_from_elemattr(&ctx
, skb
, nlh
, nla
, true);
3120 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
]);
3122 if (nla
[NFTA_SET_ELEM_LIST_SET_ID
]) {
3123 set
= nf_tables_set_lookup_byid(net
,
3124 nla
[NFTA_SET_ELEM_LIST_SET_ID
]);
3127 return PTR_ERR(set
);
3130 if (!list_empty(&set
->bindings
) && set
->flags
& NFT_SET_CONSTANT
)
3133 nla_for_each_nested(attr
, nla
[NFTA_SET_ELEM_LIST_ELEMENTS
], rem
) {
3134 err
= nft_add_set_elem(&ctx
, set
, attr
);
3143 static int nft_del_setelem(struct nft_ctx
*ctx
, struct nft_set
*set
,
3144 const struct nlattr
*attr
)
3146 struct nlattr
*nla
[NFTA_SET_ELEM_MAX
+ 1];
3147 struct nft_data_desc desc
;
3148 struct nft_set_elem elem
;
3149 struct nft_trans
*trans
;
3152 err
= nla_parse_nested(nla
, NFTA_SET_ELEM_MAX
, attr
,
3153 nft_set_elem_policy
);
3158 if (nla
[NFTA_SET_ELEM_KEY
] == NULL
)
3161 err
= nft_data_init(ctx
, &elem
.key
, &desc
, nla
[NFTA_SET_ELEM_KEY
]);
3166 if (desc
.type
!= NFT_DATA_VALUE
|| desc
.len
!= set
->klen
)
3169 err
= set
->ops
->get(set
, &elem
);
3173 trans
= nft_trans_elem_alloc(ctx
, NFT_MSG_DELSETELEM
, set
);
3177 nft_trans_elem(trans
) = elem
;
3178 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
3180 nft_data_uninit(&elem
.key
, NFT_DATA_VALUE
);
3181 if (set
->flags
& NFT_SET_MAP
)
3182 nft_data_uninit(&elem
.data
, set
->dtype
);
3185 nft_data_uninit(&elem
.key
, desc
.type
);
3190 static int nf_tables_delsetelem(struct sock
*nlsk
, struct sk_buff
*skb
,
3191 const struct nlmsghdr
*nlh
,
3192 const struct nlattr
* const nla
[])
3194 const struct nlattr
*attr
;
3195 struct nft_set
*set
;
3199 err
= nft_ctx_init_from_elemattr(&ctx
, skb
, nlh
, nla
, false);
3203 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
]);
3205 return PTR_ERR(set
);
3206 if (!list_empty(&set
->bindings
) && set
->flags
& NFT_SET_CONSTANT
)
3209 nla_for_each_nested(attr
, nla
[NFTA_SET_ELEM_LIST_ELEMENTS
], rem
) {
3210 err
= nft_del_setelem(&ctx
, set
, attr
);
3219 static const struct nfnl_callback nf_tables_cb
[NFT_MSG_MAX
] = {
3220 [NFT_MSG_NEWTABLE
] = {
3221 .call_batch
= nf_tables_newtable
,
3222 .attr_count
= NFTA_TABLE_MAX
,
3223 .policy
= nft_table_policy
,
3225 [NFT_MSG_GETTABLE
] = {
3226 .call
= nf_tables_gettable
,
3227 .attr_count
= NFTA_TABLE_MAX
,
3228 .policy
= nft_table_policy
,
3230 [NFT_MSG_DELTABLE
] = {
3231 .call_batch
= nf_tables_deltable
,
3232 .attr_count
= NFTA_TABLE_MAX
,
3233 .policy
= nft_table_policy
,
3235 [NFT_MSG_NEWCHAIN
] = {
3236 .call_batch
= nf_tables_newchain
,
3237 .attr_count
= NFTA_CHAIN_MAX
,
3238 .policy
= nft_chain_policy
,
3240 [NFT_MSG_GETCHAIN
] = {
3241 .call
= nf_tables_getchain
,
3242 .attr_count
= NFTA_CHAIN_MAX
,
3243 .policy
= nft_chain_policy
,
3245 [NFT_MSG_DELCHAIN
] = {
3246 .call_batch
= nf_tables_delchain
,
3247 .attr_count
= NFTA_CHAIN_MAX
,
3248 .policy
= nft_chain_policy
,
3250 [NFT_MSG_NEWRULE
] = {
3251 .call_batch
= nf_tables_newrule
,
3252 .attr_count
= NFTA_RULE_MAX
,
3253 .policy
= nft_rule_policy
,
3255 [NFT_MSG_GETRULE
] = {
3256 .call
= nf_tables_getrule
,
3257 .attr_count
= NFTA_RULE_MAX
,
3258 .policy
= nft_rule_policy
,
3260 [NFT_MSG_DELRULE
] = {
3261 .call_batch
= nf_tables_delrule
,
3262 .attr_count
= NFTA_RULE_MAX
,
3263 .policy
= nft_rule_policy
,
3265 [NFT_MSG_NEWSET
] = {
3266 .call_batch
= nf_tables_newset
,
3267 .attr_count
= NFTA_SET_MAX
,
3268 .policy
= nft_set_policy
,
3270 [NFT_MSG_GETSET
] = {
3271 .call
= nf_tables_getset
,
3272 .attr_count
= NFTA_SET_MAX
,
3273 .policy
= nft_set_policy
,
3275 [NFT_MSG_DELSET
] = {
3276 .call_batch
= nf_tables_delset
,
3277 .attr_count
= NFTA_SET_MAX
,
3278 .policy
= nft_set_policy
,
3280 [NFT_MSG_NEWSETELEM
] = {
3281 .call_batch
= nf_tables_newsetelem
,
3282 .attr_count
= NFTA_SET_ELEM_LIST_MAX
,
3283 .policy
= nft_set_elem_list_policy
,
3285 [NFT_MSG_GETSETELEM
] = {
3286 .call
= nf_tables_getsetelem
,
3287 .attr_count
= NFTA_SET_ELEM_LIST_MAX
,
3288 .policy
= nft_set_elem_list_policy
,
3290 [NFT_MSG_DELSETELEM
] = {
3291 .call_batch
= nf_tables_delsetelem
,
3292 .attr_count
= NFTA_SET_ELEM_LIST_MAX
,
3293 .policy
= nft_set_elem_list_policy
,
3297 static void nft_chain_commit_update(struct nft_trans
*trans
)
3299 struct nft_base_chain
*basechain
;
3301 if (nft_trans_chain_name(trans
)[0])
3302 strcpy(trans
->ctx
.chain
->name
, nft_trans_chain_name(trans
));
3304 if (!(trans
->ctx
.chain
->flags
& NFT_BASE_CHAIN
))
3307 basechain
= nft_base_chain(trans
->ctx
.chain
);
3308 nft_chain_stats_replace(basechain
, nft_trans_chain_stats(trans
));
3310 switch (nft_trans_chain_policy(trans
)) {
3313 basechain
->policy
= nft_trans_chain_policy(trans
);
3318 /* Schedule objects for release via rcu to make sure no packets are accesing
3321 static void nf_tables_commit_release_rcu(struct rcu_head
*rt
)
3323 struct nft_trans
*trans
= container_of(rt
, struct nft_trans
, rcu_head
);
3325 switch (trans
->msg_type
) {
3326 case NFT_MSG_DELTABLE
:
3327 nf_tables_table_destroy(&trans
->ctx
);
3329 case NFT_MSG_DELCHAIN
:
3330 nf_tables_chain_destroy(trans
->ctx
.chain
);
3332 case NFT_MSG_DELRULE
:
3333 nf_tables_rule_destroy(&trans
->ctx
, nft_trans_rule(trans
));
3335 case NFT_MSG_DELSET
:
3336 nft_set_destroy(nft_trans_set(trans
));
3342 static int nf_tables_commit(struct sk_buff
*skb
)
3344 struct net
*net
= sock_net(skb
->sk
);
3345 struct nft_trans
*trans
, *next
;
3346 struct nft_set
*set
;
3348 /* Bump generation counter, invalidate any dump in progress */
3351 /* A new generation has just started */
3352 net
->nft
.gencursor
= gencursor_next(net
);
3354 /* Make sure all packets have left the previous generation before
3355 * purging old rules.
3359 list_for_each_entry_safe(trans
, next
, &net
->nft
.commit_list
, list
) {
3360 switch (trans
->msg_type
) {
3361 case NFT_MSG_NEWTABLE
:
3362 if (nft_trans_table_update(trans
)) {
3363 if (!nft_trans_table_enable(trans
)) {
3364 nf_tables_table_disable(trans
->ctx
.afi
,
3366 trans
->ctx
.table
->flags
|= NFT_TABLE_F_DORMANT
;
3369 trans
->ctx
.table
->flags
&= ~NFT_TABLE_INACTIVE
;
3371 nf_tables_table_notify(&trans
->ctx
, NFT_MSG_NEWTABLE
);
3372 nft_trans_destroy(trans
);
3374 case NFT_MSG_DELTABLE
:
3375 nf_tables_table_notify(&trans
->ctx
, NFT_MSG_DELTABLE
);
3377 case NFT_MSG_NEWCHAIN
:
3378 if (nft_trans_chain_update(trans
))
3379 nft_chain_commit_update(trans
);
3381 trans
->ctx
.chain
->flags
&= ~NFT_CHAIN_INACTIVE
;
3383 nf_tables_chain_notify(&trans
->ctx
, NFT_MSG_NEWCHAIN
);
3384 nft_trans_destroy(trans
);
3386 case NFT_MSG_DELCHAIN
:
3387 nf_tables_chain_notify(&trans
->ctx
, NFT_MSG_DELCHAIN
);
3388 if (!(trans
->ctx
.table
->flags
& NFT_TABLE_F_DORMANT
) &&
3389 trans
->ctx
.chain
->flags
& NFT_BASE_CHAIN
) {
3390 nf_unregister_hooks(nft_base_chain(trans
->ctx
.chain
)->ops
,
3391 trans
->ctx
.afi
->nops
);
3394 case NFT_MSG_NEWRULE
:
3395 nft_rule_clear(trans
->ctx
.net
, nft_trans_rule(trans
));
3396 nf_tables_rule_notify(&trans
->ctx
,
3397 nft_trans_rule(trans
),
3399 nft_trans_destroy(trans
);
3401 case NFT_MSG_DELRULE
:
3402 list_del_rcu(&nft_trans_rule(trans
)->list
);
3403 nf_tables_rule_notify(&trans
->ctx
,
3404 nft_trans_rule(trans
),
3407 case NFT_MSG_NEWSET
:
3408 nft_trans_set(trans
)->flags
&= ~NFT_SET_INACTIVE
;
3409 /* This avoids hitting -EBUSY when deleting the table
3410 * from the transaction.
3412 if (nft_trans_set(trans
)->flags
& NFT_SET_ANONYMOUS
&&
3413 !list_empty(&nft_trans_set(trans
)->bindings
))
3414 trans
->ctx
.table
->use
--;
3416 nf_tables_set_notify(&trans
->ctx
, nft_trans_set(trans
),
3417 NFT_MSG_NEWSET
, GFP_KERNEL
);
3418 nft_trans_destroy(trans
);
3420 case NFT_MSG_DELSET
:
3421 nf_tables_set_notify(&trans
->ctx
, nft_trans_set(trans
),
3422 NFT_MSG_DELSET
, GFP_KERNEL
);
3424 case NFT_MSG_NEWSETELEM
:
3425 nf_tables_setelem_notify(&trans
->ctx
,
3426 nft_trans_elem_set(trans
),
3427 &nft_trans_elem(trans
),
3428 NFT_MSG_NEWSETELEM
, 0);
3429 nft_trans_destroy(trans
);
3431 case NFT_MSG_DELSETELEM
:
3432 nf_tables_setelem_notify(&trans
->ctx
,
3433 nft_trans_elem_set(trans
),
3434 &nft_trans_elem(trans
),
3435 NFT_MSG_DELSETELEM
, 0);
3436 set
= nft_trans_elem_set(trans
);
3437 set
->ops
->get(set
, &nft_trans_elem(trans
));
3438 set
->ops
->remove(set
, &nft_trans_elem(trans
));
3439 nft_trans_destroy(trans
);
3444 list_for_each_entry_safe(trans
, next
, &net
->nft
.commit_list
, list
) {
3445 list_del(&trans
->list
);
3446 trans
->ctx
.nla
= NULL
;
3447 call_rcu(&trans
->rcu_head
, nf_tables_commit_release_rcu
);
3453 /* Schedule objects for release via rcu to make sure no packets are accesing
3456 static void nf_tables_abort_release_rcu(struct rcu_head
*rt
)
3458 struct nft_trans
*trans
= container_of(rt
, struct nft_trans
, rcu_head
);
3460 switch (trans
->msg_type
) {
3461 case NFT_MSG_NEWTABLE
:
3462 nf_tables_table_destroy(&trans
->ctx
);
3464 case NFT_MSG_NEWCHAIN
:
3465 nf_tables_chain_destroy(trans
->ctx
.chain
);
3467 case NFT_MSG_NEWRULE
:
3468 nf_tables_rule_destroy(&trans
->ctx
, nft_trans_rule(trans
));
3470 case NFT_MSG_NEWSET
:
3471 nft_set_destroy(nft_trans_set(trans
));
3477 static int nf_tables_abort(struct sk_buff
*skb
)
3479 struct net
*net
= sock_net(skb
->sk
);
3480 struct nft_trans
*trans
, *next
;
3481 struct nft_set
*set
;
3483 list_for_each_entry_safe(trans
, next
, &net
->nft
.commit_list
, list
) {
3484 switch (trans
->msg_type
) {
3485 case NFT_MSG_NEWTABLE
:
3486 if (nft_trans_table_update(trans
)) {
3487 if (nft_trans_table_enable(trans
)) {
3488 nf_tables_table_disable(trans
->ctx
.afi
,
3490 trans
->ctx
.table
->flags
|= NFT_TABLE_F_DORMANT
;
3492 nft_trans_destroy(trans
);
3494 list_del(&trans
->ctx
.table
->list
);
3497 case NFT_MSG_DELTABLE
:
3498 list_add_tail(&trans
->ctx
.table
->list
,
3499 &trans
->ctx
.afi
->tables
);
3500 nft_trans_destroy(trans
);
3502 case NFT_MSG_NEWCHAIN
:
3503 if (nft_trans_chain_update(trans
)) {
3504 if (nft_trans_chain_stats(trans
))
3505 free_percpu(nft_trans_chain_stats(trans
));
3507 nft_trans_destroy(trans
);
3509 trans
->ctx
.table
->use
--;
3510 list_del(&trans
->ctx
.chain
->list
);
3511 if (!(trans
->ctx
.table
->flags
& NFT_TABLE_F_DORMANT
) &&
3512 trans
->ctx
.chain
->flags
& NFT_BASE_CHAIN
) {
3513 nf_unregister_hooks(nft_base_chain(trans
->ctx
.chain
)->ops
,
3514 trans
->ctx
.afi
->nops
);
3518 case NFT_MSG_DELCHAIN
:
3519 trans
->ctx
.table
->use
++;
3520 list_add_tail(&trans
->ctx
.chain
->list
,
3521 &trans
->ctx
.table
->chains
);
3522 nft_trans_destroy(trans
);
3524 case NFT_MSG_NEWRULE
:
3525 trans
->ctx
.chain
->use
--;
3526 list_del_rcu(&nft_trans_rule(trans
)->list
);
3528 case NFT_MSG_DELRULE
:
3529 trans
->ctx
.chain
->use
++;
3530 nft_rule_clear(trans
->ctx
.net
, nft_trans_rule(trans
));
3531 nft_trans_destroy(trans
);
3533 case NFT_MSG_NEWSET
:
3534 trans
->ctx
.table
->use
--;
3535 list_del(&nft_trans_set(trans
)->list
);
3537 case NFT_MSG_DELSET
:
3538 trans
->ctx
.table
->use
++;
3539 list_add_tail(&nft_trans_set(trans
)->list
,
3540 &trans
->ctx
.table
->sets
);
3541 nft_trans_destroy(trans
);
3543 case NFT_MSG_NEWSETELEM
:
3544 nft_trans_elem_set(trans
)->nelems
--;
3545 set
= nft_trans_elem_set(trans
);
3546 set
->ops
->get(set
, &nft_trans_elem(trans
));
3547 set
->ops
->remove(set
, &nft_trans_elem(trans
));
3548 nft_trans_destroy(trans
);
3550 case NFT_MSG_DELSETELEM
:
3551 nft_trans_elem_set(trans
)->nelems
++;
3552 nft_trans_destroy(trans
);
3557 list_for_each_entry_safe_reverse(trans
, next
,
3558 &net
->nft
.commit_list
, list
) {
3559 list_del(&trans
->list
);
3560 trans
->ctx
.nla
= NULL
;
3561 call_rcu(&trans
->rcu_head
, nf_tables_abort_release_rcu
);
3567 static const struct nfnetlink_subsystem nf_tables_subsys
= {
3568 .name
= "nf_tables",
3569 .subsys_id
= NFNL_SUBSYS_NFTABLES
,
3570 .cb_count
= NFT_MSG_MAX
,
3572 .commit
= nf_tables_commit
,
3573 .abort
= nf_tables_abort
,
3577 * Loop detection - walk through the ruleset beginning at the destination chain
3578 * of a new jump until either the source chain is reached (loop) or all
3579 * reachable chains have been traversed.
3581 * The loop check is performed whenever a new jump verdict is added to an
3582 * expression or verdict map or a verdict map is bound to a new chain.
3585 static int nf_tables_check_loops(const struct nft_ctx
*ctx
,
3586 const struct nft_chain
*chain
);
3588 static int nf_tables_loop_check_setelem(const struct nft_ctx
*ctx
,
3589 const struct nft_set
*set
,
3590 const struct nft_set_iter
*iter
,
3591 const struct nft_set_elem
*elem
)
3593 if (elem
->flags
& NFT_SET_ELEM_INTERVAL_END
)
3596 switch (elem
->data
.verdict
) {
3599 return nf_tables_check_loops(ctx
, elem
->data
.chain
);
3605 static int nf_tables_check_loops(const struct nft_ctx
*ctx
,
3606 const struct nft_chain
*chain
)
3608 const struct nft_rule
*rule
;
3609 const struct nft_expr
*expr
, *last
;
3610 const struct nft_set
*set
;
3611 struct nft_set_binding
*binding
;
3612 struct nft_set_iter iter
;
3614 if (ctx
->chain
== chain
)
3617 list_for_each_entry(rule
, &chain
->rules
, list
) {
3618 nft_rule_for_each_expr(expr
, last
, rule
) {
3619 const struct nft_data
*data
= NULL
;
3622 if (!expr
->ops
->validate
)
3625 err
= expr
->ops
->validate(ctx
, expr
, &data
);
3632 switch (data
->verdict
) {
3635 err
= nf_tables_check_loops(ctx
, data
->chain
);
3644 list_for_each_entry(set
, &ctx
->table
->sets
, list
) {
3645 if (!(set
->flags
& NFT_SET_MAP
) ||
3646 set
->dtype
!= NFT_DATA_VERDICT
)
3649 list_for_each_entry(binding
, &set
->bindings
, list
) {
3650 if (binding
->chain
!= chain
)
3656 iter
.fn
= nf_tables_loop_check_setelem
;
3658 set
->ops
->walk(ctx
, set
, &iter
);
3668 * nft_validate_input_register - validate an expressions' input register
3670 * @reg: the register number
3672 * Validate that the input register is one of the general purpose
3675 int nft_validate_input_register(enum nft_registers reg
)
3677 if (reg
<= NFT_REG_VERDICT
)
3679 if (reg
> NFT_REG_MAX
)
3683 EXPORT_SYMBOL_GPL(nft_validate_input_register
);
3686 * nft_validate_output_register - validate an expressions' output register
3688 * @reg: the register number
3690 * Validate that the output register is one of the general purpose
3691 * registers or the verdict register.
3693 int nft_validate_output_register(enum nft_registers reg
)
3695 if (reg
< NFT_REG_VERDICT
)
3697 if (reg
> NFT_REG_MAX
)
3701 EXPORT_SYMBOL_GPL(nft_validate_output_register
);
3704 * nft_validate_data_load - validate an expressions' data load
3706 * @ctx: context of the expression performing the load
3707 * @reg: the destination register number
3708 * @data: the data to load
3709 * @type: the data type
3711 * Validate that a data load uses the appropriate data type for
3712 * the destination register. A value of NULL for the data means
3713 * that its runtime gathered data, which is always of type
3716 int nft_validate_data_load(const struct nft_ctx
*ctx
, enum nft_registers reg
,
3717 const struct nft_data
*data
,
3718 enum nft_data_types type
)
3723 case NFT_REG_VERDICT
:
3724 if (data
== NULL
|| type
!= NFT_DATA_VERDICT
)
3727 if (data
->verdict
== NFT_GOTO
|| data
->verdict
== NFT_JUMP
) {
3728 err
= nf_tables_check_loops(ctx
, data
->chain
);
3732 if (ctx
->chain
->level
+ 1 > data
->chain
->level
) {
3733 if (ctx
->chain
->level
+ 1 == NFT_JUMP_STACK_SIZE
)
3735 data
->chain
->level
= ctx
->chain
->level
+ 1;
3741 if (data
!= NULL
&& type
!= NFT_DATA_VALUE
)
3746 EXPORT_SYMBOL_GPL(nft_validate_data_load
);
3748 static const struct nla_policy nft_verdict_policy
[NFTA_VERDICT_MAX
+ 1] = {
3749 [NFTA_VERDICT_CODE
] = { .type
= NLA_U32
},
3750 [NFTA_VERDICT_CHAIN
] = { .type
= NLA_STRING
,
3751 .len
= NFT_CHAIN_MAXNAMELEN
- 1 },
3754 static int nft_verdict_init(const struct nft_ctx
*ctx
, struct nft_data
*data
,
3755 struct nft_data_desc
*desc
, const struct nlattr
*nla
)
3757 struct nlattr
*tb
[NFTA_VERDICT_MAX
+ 1];
3758 struct nft_chain
*chain
;
3761 err
= nla_parse_nested(tb
, NFTA_VERDICT_MAX
, nla
, nft_verdict_policy
);
3765 if (!tb
[NFTA_VERDICT_CODE
])
3767 data
->verdict
= ntohl(nla_get_be32(tb
[NFTA_VERDICT_CODE
]));
3769 switch (data
->verdict
) {
3771 switch (data
->verdict
& NF_VERDICT_MASK
) {
3783 desc
->len
= sizeof(data
->verdict
);
3787 if (!tb
[NFTA_VERDICT_CHAIN
])
3789 chain
= nf_tables_chain_lookup(ctx
->table
,
3790 tb
[NFTA_VERDICT_CHAIN
]);
3792 return PTR_ERR(chain
);
3793 if (chain
->flags
& NFT_BASE_CHAIN
)
3797 data
->chain
= chain
;
3798 desc
->len
= sizeof(data
);
3802 desc
->type
= NFT_DATA_VERDICT
;
3806 static void nft_verdict_uninit(const struct nft_data
*data
)
3808 switch (data
->verdict
) {
3816 static int nft_verdict_dump(struct sk_buff
*skb
, const struct nft_data
*data
)
3818 struct nlattr
*nest
;
3820 nest
= nla_nest_start(skb
, NFTA_DATA_VERDICT
);
3822 goto nla_put_failure
;
3824 if (nla_put_be32(skb
, NFTA_VERDICT_CODE
, htonl(data
->verdict
)))
3825 goto nla_put_failure
;
3827 switch (data
->verdict
) {
3830 if (nla_put_string(skb
, NFTA_VERDICT_CHAIN
, data
->chain
->name
))
3831 goto nla_put_failure
;
3833 nla_nest_end(skb
, nest
);
3840 static int nft_value_init(const struct nft_ctx
*ctx
, struct nft_data
*data
,
3841 struct nft_data_desc
*desc
, const struct nlattr
*nla
)
3848 if (len
> sizeof(data
->data
))
3851 nla_memcpy(data
->data
, nla
, sizeof(data
->data
));
3852 desc
->type
= NFT_DATA_VALUE
;
3857 static int nft_value_dump(struct sk_buff
*skb
, const struct nft_data
*data
,
3860 return nla_put(skb
, NFTA_DATA_VALUE
, len
, data
->data
);
3863 static const struct nla_policy nft_data_policy
[NFTA_DATA_MAX
+ 1] = {
3864 [NFTA_DATA_VALUE
] = { .type
= NLA_BINARY
,
3865 .len
= FIELD_SIZEOF(struct nft_data
, data
) },
3866 [NFTA_DATA_VERDICT
] = { .type
= NLA_NESTED
},
3870 * nft_data_init - parse nf_tables data netlink attributes
3872 * @ctx: context of the expression using the data
3873 * @data: destination struct nft_data
3874 * @desc: data description
3875 * @nla: netlink attribute containing data
3877 * Parse the netlink data attributes and initialize a struct nft_data.
3878 * The type and length of data are returned in the data description.
3880 * The caller can indicate that it only wants to accept data of type
3881 * NFT_DATA_VALUE by passing NULL for the ctx argument.
3883 int nft_data_init(const struct nft_ctx
*ctx
, struct nft_data
*data
,
3884 struct nft_data_desc
*desc
, const struct nlattr
*nla
)
3886 struct nlattr
*tb
[NFTA_DATA_MAX
+ 1];
3889 err
= nla_parse_nested(tb
, NFTA_DATA_MAX
, nla
, nft_data_policy
);
3893 if (tb
[NFTA_DATA_VALUE
])
3894 return nft_value_init(ctx
, data
, desc
, tb
[NFTA_DATA_VALUE
]);
3895 if (tb
[NFTA_DATA_VERDICT
] && ctx
!= NULL
)
3896 return nft_verdict_init(ctx
, data
, desc
, tb
[NFTA_DATA_VERDICT
]);
3899 EXPORT_SYMBOL_GPL(nft_data_init
);
3902 * nft_data_uninit - release a nft_data item
3904 * @data: struct nft_data to release
3905 * @type: type of data
3907 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
3908 * all others need to be released by calling this function.
3910 void nft_data_uninit(const struct nft_data
*data
, enum nft_data_types type
)
3913 case NFT_DATA_VALUE
:
3915 case NFT_DATA_VERDICT
:
3916 return nft_verdict_uninit(data
);
3921 EXPORT_SYMBOL_GPL(nft_data_uninit
);
3923 int nft_data_dump(struct sk_buff
*skb
, int attr
, const struct nft_data
*data
,
3924 enum nft_data_types type
, unsigned int len
)
3926 struct nlattr
*nest
;
3929 nest
= nla_nest_start(skb
, attr
);
3934 case NFT_DATA_VALUE
:
3935 err
= nft_value_dump(skb
, data
, len
);
3937 case NFT_DATA_VERDICT
:
3938 err
= nft_verdict_dump(skb
, data
);
3945 nla_nest_end(skb
, nest
);
3948 EXPORT_SYMBOL_GPL(nft_data_dump
);
3950 static int nf_tables_init_net(struct net
*net
)
3952 INIT_LIST_HEAD(&net
->nft
.af_info
);
3953 INIT_LIST_HEAD(&net
->nft
.commit_list
);
3957 static struct pernet_operations nf_tables_net_ops
= {
3958 .init
= nf_tables_init_net
,
3961 static int __init
nf_tables_module_init(void)
3965 info
= kmalloc(sizeof(struct nft_expr_info
) * NFT_RULE_MAXEXPRS
,
3972 err
= nf_tables_core_module_init();
3976 err
= nfnetlink_subsys_register(&nf_tables_subsys
);
3980 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
3981 return register_pernet_subsys(&nf_tables_net_ops
);
3983 nf_tables_core_module_exit();
3990 static void __exit
nf_tables_module_exit(void)
3992 unregister_pernet_subsys(&nf_tables_net_ops
);
3993 nfnetlink_subsys_unregister(&nf_tables_subsys
);
3994 nf_tables_core_module_exit();
3998 module_init(nf_tables_module_init
);
3999 module_exit(nf_tables_module_exit
);
4001 MODULE_LICENSE("GPL");
4002 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4003 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES
);