1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005-2006 by Pablo Neira Ayuso <pablo@eurodev.net>
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/types.h>
22 #include <linux/timer.h>
23 #include <linux/skbuff.h>
24 #include <linux/errno.h>
25 #include <linux/netlink.h>
26 #include <linux/spinlock.h>
27 #include <linux/interrupt.h>
28 #include <linux/notifier.h>
30 #include <linux/netfilter.h>
31 #include <net/netlink.h>
32 #include <net/netfilter/nf_conntrack.h>
33 #include <net/netfilter/nf_conntrack_core.h>
34 #include <net/netfilter/nf_conntrack_expect.h>
35 #include <net/netfilter/nf_conntrack_helper.h>
36 #include <net/netfilter/nf_conntrack_l3proto.h>
37 #include <net/netfilter/nf_conntrack_l4proto.h>
38 #include <net/netfilter/nf_conntrack_tuple.h>
39 #ifdef CONFIG_NF_NAT_NEEDED
40 #include <net/netfilter/nf_nat_core.h>
41 #include <net/netfilter/nf_nat_protocol.h>
44 #include <linux/netfilter/nfnetlink.h>
45 #include <linux/netfilter/nfnetlink_conntrack.h>
47 MODULE_LICENSE("GPL");
49 static char __initdata version
[] = "0.93";
52 ctnetlink_dump_tuples_proto(struct sk_buff
*skb
,
53 const struct nf_conntrack_tuple
*tuple
,
54 struct nf_conntrack_l4proto
*l4proto
)
57 struct nfattr
*nest_parms
= NFA_NEST(skb
, CTA_TUPLE_PROTO
);
59 NFA_PUT(skb
, CTA_PROTO_NUM
, sizeof(u_int8_t
), &tuple
->dst
.protonum
);
61 if (likely(l4proto
->tuple_to_nfattr
))
62 ret
= l4proto
->tuple_to_nfattr(skb
, tuple
);
64 NFA_NEST_END(skb
, nest_parms
);
73 ctnetlink_dump_tuples_ip(struct sk_buff
*skb
,
74 const struct nf_conntrack_tuple
*tuple
,
75 struct nf_conntrack_l3proto
*l3proto
)
78 struct nfattr
*nest_parms
= NFA_NEST(skb
, CTA_TUPLE_IP
);
80 if (likely(l3proto
->tuple_to_nfattr
))
81 ret
= l3proto
->tuple_to_nfattr(skb
, tuple
);
83 NFA_NEST_END(skb
, nest_parms
);
92 ctnetlink_dump_tuples(struct sk_buff
*skb
,
93 const struct nf_conntrack_tuple
*tuple
)
96 struct nf_conntrack_l3proto
*l3proto
;
97 struct nf_conntrack_l4proto
*l4proto
;
99 l3proto
= nf_ct_l3proto_find_get(tuple
->src
.l3num
);
100 ret
= ctnetlink_dump_tuples_ip(skb
, tuple
, l3proto
);
101 nf_ct_l3proto_put(l3proto
);
103 if (unlikely(ret
< 0))
106 l4proto
= nf_ct_l4proto_find_get(tuple
->src
.l3num
, tuple
->dst
.protonum
);
107 ret
= ctnetlink_dump_tuples_proto(skb
, tuple
, l4proto
);
108 nf_ct_l4proto_put(l4proto
);
114 ctnetlink_dump_status(struct sk_buff
*skb
, const struct nf_conn
*ct
)
116 __be32 status
= htonl((u_int32_t
) ct
->status
);
117 NFA_PUT(skb
, CTA_STATUS
, sizeof(status
), &status
);
125 ctnetlink_dump_timeout(struct sk_buff
*skb
, const struct nf_conn
*ct
)
127 long timeout_l
= ct
->timeout
.expires
- jiffies
;
133 timeout
= htonl(timeout_l
/ HZ
);
135 NFA_PUT(skb
, CTA_TIMEOUT
, sizeof(timeout
), &timeout
);
143 ctnetlink_dump_protoinfo(struct sk_buff
*skb
, const struct nf_conn
*ct
)
145 struct nf_conntrack_l4proto
*l4proto
= nf_ct_l4proto_find_get(ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
, ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.protonum
);
146 struct nfattr
*nest_proto
;
149 if (!l4proto
->to_nfattr
) {
150 nf_ct_l4proto_put(l4proto
);
154 nest_proto
= NFA_NEST(skb
, CTA_PROTOINFO
);
156 ret
= l4proto
->to_nfattr(skb
, nest_proto
, ct
);
158 nf_ct_l4proto_put(l4proto
);
160 NFA_NEST_END(skb
, nest_proto
);
165 nf_ct_l4proto_put(l4proto
);
170 ctnetlink_dump_helpinfo(struct sk_buff
*skb
, const struct nf_conn
*ct
)
172 struct nfattr
*nest_helper
;
173 const struct nf_conn_help
*help
= nfct_help(ct
);
175 if (!help
|| !help
->helper
)
178 nest_helper
= NFA_NEST(skb
, CTA_HELP
);
179 NFA_PUT(skb
, CTA_HELP_NAME
, strlen(help
->helper
->name
), help
->helper
->name
);
181 if (help
->helper
->to_nfattr
)
182 help
->helper
->to_nfattr(skb
, ct
);
184 NFA_NEST_END(skb
, nest_helper
);
192 #ifdef CONFIG_NF_CT_ACCT
194 ctnetlink_dump_counters(struct sk_buff
*skb
, const struct nf_conn
*ct
,
195 enum ip_conntrack_dir dir
)
197 enum ctattr_type type
= dir
? CTA_COUNTERS_REPLY
: CTA_COUNTERS_ORIG
;
198 struct nfattr
*nest_count
= NFA_NEST(skb
, type
);
201 tmp
= htonl(ct
->counters
[dir
].packets
);
202 NFA_PUT(skb
, CTA_COUNTERS32_PACKETS
, sizeof(u_int32_t
), &tmp
);
204 tmp
= htonl(ct
->counters
[dir
].bytes
);
205 NFA_PUT(skb
, CTA_COUNTERS32_BYTES
, sizeof(u_int32_t
), &tmp
);
207 NFA_NEST_END(skb
, nest_count
);
215 #define ctnetlink_dump_counters(a, b, c) (0)
218 #ifdef CONFIG_NF_CONNTRACK_MARK
220 ctnetlink_dump_mark(struct sk_buff
*skb
, const struct nf_conn
*ct
)
222 __be32 mark
= htonl(ct
->mark
);
224 NFA_PUT(skb
, CTA_MARK
, sizeof(u_int32_t
), &mark
);
231 #define ctnetlink_dump_mark(a, b) (0)
235 ctnetlink_dump_id(struct sk_buff
*skb
, const struct nf_conn
*ct
)
237 __be32 id
= htonl(ct
->id
);
238 NFA_PUT(skb
, CTA_ID
, sizeof(u_int32_t
), &id
);
246 ctnetlink_dump_use(struct sk_buff
*skb
, const struct nf_conn
*ct
)
248 __be32 use
= htonl(atomic_read(&ct
->ct_general
.use
));
250 NFA_PUT(skb
, CTA_USE
, sizeof(u_int32_t
), &use
);
257 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
260 ctnetlink_fill_info(struct sk_buff
*skb
, u32 pid
, u32 seq
,
261 int event
, int nowait
,
262 const struct nf_conn
*ct
)
264 struct nlmsghdr
*nlh
;
265 struct nfgenmsg
*nfmsg
;
266 struct nfattr
*nest_parms
;
267 unsigned char *b
= skb_tail_pointer(skb
);
269 event
|= NFNL_SUBSYS_CTNETLINK
<< 8;
270 nlh
= NLMSG_PUT(skb
, pid
, seq
, event
, sizeof(struct nfgenmsg
));
271 nfmsg
= NLMSG_DATA(nlh
);
273 nlh
->nlmsg_flags
= (nowait
&& pid
) ? NLM_F_MULTI
: 0;
274 nfmsg
->nfgen_family
=
275 ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
;
276 nfmsg
->version
= NFNETLINK_V0
;
279 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_ORIG
);
280 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
282 NFA_NEST_END(skb
, nest_parms
);
284 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_REPLY
);
285 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
287 NFA_NEST_END(skb
, nest_parms
);
289 if (ctnetlink_dump_status(skb
, ct
) < 0 ||
290 ctnetlink_dump_timeout(skb
, ct
) < 0 ||
291 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
292 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0 ||
293 ctnetlink_dump_protoinfo(skb
, ct
) < 0 ||
294 ctnetlink_dump_helpinfo(skb
, ct
) < 0 ||
295 ctnetlink_dump_mark(skb
, ct
) < 0 ||
296 ctnetlink_dump_id(skb
, ct
) < 0 ||
297 ctnetlink_dump_use(skb
, ct
) < 0)
300 nlh
->nlmsg_len
= skb_tail_pointer(skb
) - b
;
309 #ifdef CONFIG_NF_CONNTRACK_EVENTS
310 static int ctnetlink_conntrack_event(struct notifier_block
*this,
311 unsigned long events
, void *ptr
)
313 struct nlmsghdr
*nlh
;
314 struct nfgenmsg
*nfmsg
;
315 struct nfattr
*nest_parms
;
316 struct nf_conn
*ct
= (struct nf_conn
*)ptr
;
320 unsigned int flags
= 0, group
;
322 /* ignore our fake conntrack entry */
323 if (ct
== &nf_conntrack_untracked
)
326 if (events
& IPCT_DESTROY
) {
327 type
= IPCTNL_MSG_CT_DELETE
;
328 group
= NFNLGRP_CONNTRACK_DESTROY
;
329 } else if (events
& (IPCT_NEW
| IPCT_RELATED
)) {
330 type
= IPCTNL_MSG_CT_NEW
;
331 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
332 group
= NFNLGRP_CONNTRACK_NEW
;
333 } else if (events
& (IPCT_STATUS
| IPCT_PROTOINFO
)) {
334 type
= IPCTNL_MSG_CT_NEW
;
335 group
= NFNLGRP_CONNTRACK_UPDATE
;
339 if (!nfnetlink_has_listeners(group
))
342 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_ATOMIC
);
348 type
|= NFNL_SUBSYS_CTNETLINK
<< 8;
349 nlh
= NLMSG_PUT(skb
, 0, 0, type
, sizeof(struct nfgenmsg
));
350 nfmsg
= NLMSG_DATA(nlh
);
352 nlh
->nlmsg_flags
= flags
;
353 nfmsg
->nfgen_family
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
;
354 nfmsg
->version
= NFNETLINK_V0
;
357 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_ORIG
);
358 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
360 NFA_NEST_END(skb
, nest_parms
);
362 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_REPLY
);
363 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
365 NFA_NEST_END(skb
, nest_parms
);
367 if (events
& IPCT_DESTROY
) {
368 if (ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
369 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0)
372 if (ctnetlink_dump_status(skb
, ct
) < 0)
375 if (ctnetlink_dump_timeout(skb
, ct
) < 0)
378 if (events
& IPCT_PROTOINFO
379 && ctnetlink_dump_protoinfo(skb
, ct
) < 0)
382 if ((events
& IPCT_HELPER
|| nfct_help(ct
))
383 && ctnetlink_dump_helpinfo(skb
, ct
) < 0)
386 #ifdef CONFIG_NF_CONNTRACK_MARK
387 if ((events
& IPCT_MARK
|| ct
->mark
)
388 && ctnetlink_dump_mark(skb
, ct
) < 0)
392 if (events
& IPCT_COUNTER_FILLING
&&
393 (ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
394 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0))
398 nlh
->nlmsg_len
= skb
->tail
- b
;
399 nfnetlink_send(skb
, 0, group
, 0);
407 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
409 static int ctnetlink_done(struct netlink_callback
*cb
)
412 nf_ct_put((struct nf_conn
*)cb
->args
[1]);
416 #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
419 ctnetlink_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
421 struct nf_conn
*ct
, *last
;
422 struct nf_conntrack_tuple_hash
*h
;
424 struct nfgenmsg
*nfmsg
= NLMSG_DATA(cb
->nlh
);
425 u_int8_t l3proto
= nfmsg
->nfgen_family
;
427 read_lock_bh(&nf_conntrack_lock
);
428 last
= (struct nf_conn
*)cb
->args
[1];
429 for (; cb
->args
[0] < nf_conntrack_htable_size
; cb
->args
[0]++) {
431 list_for_each_prev(i
, &nf_conntrack_hash
[cb
->args
[0]]) {
432 h
= (struct nf_conntrack_tuple_hash
*) i
;
433 if (NF_CT_DIRECTION(h
) != IP_CT_DIR_ORIGINAL
)
435 ct
= nf_ct_tuplehash_to_ctrack(h
);
436 /* Dump entries of a given L3 protocol number.
437 * If it is not specified, ie. l3proto == 0,
438 * then dump everything. */
439 if (l3proto
&& L3PROTO(ct
) != l3proto
)
446 if (ctnetlink_fill_info(skb
, NETLINK_CB(cb
->skb
).pid
,
450 nf_conntrack_get(&ct
->ct_general
);
451 cb
->args
[1] = (unsigned long)ct
;
454 #ifdef CONFIG_NF_CT_ACCT
455 if (NFNL_MSG_TYPE(cb
->nlh
->nlmsg_type
) ==
456 IPCTNL_MSG_CT_GET_CTRZERO
)
457 memset(&ct
->counters
, 0, sizeof(ct
->counters
));
466 read_unlock_bh(&nf_conntrack_lock
);
474 ctnetlink_parse_tuple_ip(struct nfattr
*attr
, struct nf_conntrack_tuple
*tuple
)
476 struct nfattr
*tb
[CTA_IP_MAX
];
477 struct nf_conntrack_l3proto
*l3proto
;
480 nfattr_parse_nested(tb
, CTA_IP_MAX
, attr
);
482 l3proto
= nf_ct_l3proto_find_get(tuple
->src
.l3num
);
484 if (likely(l3proto
->nfattr_to_tuple
))
485 ret
= l3proto
->nfattr_to_tuple(tb
, tuple
);
487 nf_ct_l3proto_put(l3proto
);
492 static const size_t cta_min_proto
[CTA_PROTO_MAX
] = {
493 [CTA_PROTO_NUM
-1] = sizeof(u_int8_t
),
497 ctnetlink_parse_tuple_proto(struct nfattr
*attr
,
498 struct nf_conntrack_tuple
*tuple
)
500 struct nfattr
*tb
[CTA_PROTO_MAX
];
501 struct nf_conntrack_l4proto
*l4proto
;
504 nfattr_parse_nested(tb
, CTA_PROTO_MAX
, attr
);
506 if (nfattr_bad_size(tb
, CTA_PROTO_MAX
, cta_min_proto
))
509 if (!tb
[CTA_PROTO_NUM
-1])
511 tuple
->dst
.protonum
= *(u_int8_t
*)NFA_DATA(tb
[CTA_PROTO_NUM
-1]);
513 l4proto
= nf_ct_l4proto_find_get(tuple
->src
.l3num
, tuple
->dst
.protonum
);
515 if (likely(l4proto
->nfattr_to_tuple
))
516 ret
= l4proto
->nfattr_to_tuple(tb
, tuple
);
518 nf_ct_l4proto_put(l4proto
);
524 ctnetlink_parse_tuple(struct nfattr
*cda
[], struct nf_conntrack_tuple
*tuple
,
525 enum ctattr_tuple type
, u_int8_t l3num
)
527 struct nfattr
*tb
[CTA_TUPLE_MAX
];
530 memset(tuple
, 0, sizeof(*tuple
));
532 nfattr_parse_nested(tb
, CTA_TUPLE_MAX
, cda
[type
-1]);
534 if (!tb
[CTA_TUPLE_IP
-1])
537 tuple
->src
.l3num
= l3num
;
539 err
= ctnetlink_parse_tuple_ip(tb
[CTA_TUPLE_IP
-1], tuple
);
543 if (!tb
[CTA_TUPLE_PROTO
-1])
546 err
= ctnetlink_parse_tuple_proto(tb
[CTA_TUPLE_PROTO
-1], tuple
);
550 /* orig and expect tuples get DIR_ORIGINAL */
551 if (type
== CTA_TUPLE_REPLY
)
552 tuple
->dst
.dir
= IP_CT_DIR_REPLY
;
554 tuple
->dst
.dir
= IP_CT_DIR_ORIGINAL
;
559 #ifdef CONFIG_NF_NAT_NEEDED
560 static const size_t cta_min_protonat
[CTA_PROTONAT_MAX
] = {
561 [CTA_PROTONAT_PORT_MIN
-1] = sizeof(u_int16_t
),
562 [CTA_PROTONAT_PORT_MAX
-1] = sizeof(u_int16_t
),
565 static int nfnetlink_parse_nat_proto(struct nfattr
*attr
,
566 const struct nf_conn
*ct
,
567 struct nf_nat_range
*range
)
569 struct nfattr
*tb
[CTA_PROTONAT_MAX
];
570 struct nf_nat_protocol
*npt
;
572 nfattr_parse_nested(tb
, CTA_PROTONAT_MAX
, attr
);
574 if (nfattr_bad_size(tb
, CTA_PROTONAT_MAX
, cta_min_protonat
))
577 npt
= nf_nat_proto_find_get(ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.protonum
);
579 if (!npt
->nfattr_to_range
) {
580 nf_nat_proto_put(npt
);
584 /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
585 if (npt
->nfattr_to_range(tb
, range
) > 0)
586 range
->flags
|= IP_NAT_RANGE_PROTO_SPECIFIED
;
588 nf_nat_proto_put(npt
);
593 static const size_t cta_min_nat
[CTA_NAT_MAX
] = {
594 [CTA_NAT_MINIP
-1] = sizeof(u_int32_t
),
595 [CTA_NAT_MAXIP
-1] = sizeof(u_int32_t
),
599 nfnetlink_parse_nat(struct nfattr
*nat
,
600 const struct nf_conn
*ct
, struct nf_nat_range
*range
)
602 struct nfattr
*tb
[CTA_NAT_MAX
];
605 memset(range
, 0, sizeof(*range
));
607 nfattr_parse_nested(tb
, CTA_NAT_MAX
, nat
);
609 if (nfattr_bad_size(tb
, CTA_NAT_MAX
, cta_min_nat
))
612 if (tb
[CTA_NAT_MINIP
-1])
613 range
->min_ip
= *(__be32
*)NFA_DATA(tb
[CTA_NAT_MINIP
-1]);
615 if (!tb
[CTA_NAT_MAXIP
-1])
616 range
->max_ip
= range
->min_ip
;
618 range
->max_ip
= *(__be32
*)NFA_DATA(tb
[CTA_NAT_MAXIP
-1]);
621 range
->flags
|= IP_NAT_RANGE_MAP_IPS
;
623 if (!tb
[CTA_NAT_PROTO
-1])
626 err
= nfnetlink_parse_nat_proto(tb
[CTA_NAT_PROTO
-1], ct
, range
);
635 ctnetlink_parse_help(struct nfattr
*attr
, char **helper_name
)
637 struct nfattr
*tb
[CTA_HELP_MAX
];
639 nfattr_parse_nested(tb
, CTA_HELP_MAX
, attr
);
641 if (!tb
[CTA_HELP_NAME
-1])
644 *helper_name
= NFA_DATA(tb
[CTA_HELP_NAME
-1]);
649 static const size_t cta_min
[CTA_MAX
] = {
650 [CTA_STATUS
-1] = sizeof(u_int32_t
),
651 [CTA_TIMEOUT
-1] = sizeof(u_int32_t
),
652 [CTA_MARK
-1] = sizeof(u_int32_t
),
653 [CTA_USE
-1] = sizeof(u_int32_t
),
654 [CTA_ID
-1] = sizeof(u_int32_t
)
658 ctnetlink_del_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
659 struct nlmsghdr
*nlh
, struct nfattr
*cda
[])
661 struct nf_conntrack_tuple_hash
*h
;
662 struct nf_conntrack_tuple tuple
;
664 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
665 u_int8_t u3
= nfmsg
->nfgen_family
;
668 if (nfattr_bad_size(cda
, CTA_MAX
, cta_min
))
671 if (cda
[CTA_TUPLE_ORIG
-1])
672 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
, u3
);
673 else if (cda
[CTA_TUPLE_REPLY
-1])
674 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
, u3
);
676 /* Flush the whole table */
677 nf_conntrack_flush();
684 h
= nf_conntrack_find_get(&tuple
, NULL
);
688 ct
= nf_ct_tuplehash_to_ctrack(h
);
691 u_int32_t id
= ntohl(*(__be32
*)NFA_DATA(cda
[CTA_ID
-1]));
697 if (del_timer(&ct
->timeout
))
698 ct
->timeout
.function((unsigned long)ct
);
706 ctnetlink_get_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
707 struct nlmsghdr
*nlh
, struct nfattr
*cda
[])
709 struct nf_conntrack_tuple_hash
*h
;
710 struct nf_conntrack_tuple tuple
;
712 struct sk_buff
*skb2
= NULL
;
713 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
714 u_int8_t u3
= nfmsg
->nfgen_family
;
717 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
718 #ifndef CONFIG_NF_CT_ACCT
719 if (NFNL_MSG_TYPE(nlh
->nlmsg_type
) == IPCTNL_MSG_CT_GET_CTRZERO
)
722 return netlink_dump_start(ctnl
, skb
, nlh
, ctnetlink_dump_table
,
726 if (nfattr_bad_size(cda
, CTA_MAX
, cta_min
))
729 if (cda
[CTA_TUPLE_ORIG
-1])
730 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
, u3
);
731 else if (cda
[CTA_TUPLE_REPLY
-1])
732 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
, u3
);
739 h
= nf_conntrack_find_get(&tuple
, NULL
);
743 ct
= nf_ct_tuplehash_to_ctrack(h
);
746 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
752 err
= ctnetlink_fill_info(skb2
, NETLINK_CB(skb
).pid
, nlh
->nlmsg_seq
,
753 IPCTNL_MSG_CT_NEW
, 1, ct
);
758 err
= netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).pid
, MSG_DONTWAIT
);
771 ctnetlink_change_status(struct nf_conn
*ct
, struct nfattr
*cda
[])
774 unsigned int status
= ntohl(*(__be32
*)NFA_DATA(cda
[CTA_STATUS
-1]));
775 d
= ct
->status
^ status
;
777 if (d
& (IPS_EXPECTED
|IPS_CONFIRMED
|IPS_DYING
))
781 if (d
& IPS_SEEN_REPLY
&& !(status
& IPS_SEEN_REPLY
))
782 /* SEEN_REPLY bit can only be set */
786 if (d
& IPS_ASSURED
&& !(status
& IPS_ASSURED
))
787 /* ASSURED bit can only be set */
790 if (cda
[CTA_NAT_SRC
-1] || cda
[CTA_NAT_DST
-1]) {
791 #ifndef CONFIG_NF_NAT_NEEDED
794 struct nf_nat_range range
;
796 if (cda
[CTA_NAT_DST
-1]) {
797 if (nfnetlink_parse_nat(cda
[CTA_NAT_DST
-1], ct
,
800 if (nf_nat_initialized(ct
,
801 HOOK2MANIP(NF_IP_PRE_ROUTING
)))
803 nf_nat_setup_info(ct
, &range
, NF_IP_PRE_ROUTING
);
805 if (cda
[CTA_NAT_SRC
-1]) {
806 if (nfnetlink_parse_nat(cda
[CTA_NAT_SRC
-1], ct
,
809 if (nf_nat_initialized(ct
,
810 HOOK2MANIP(NF_IP_POST_ROUTING
)))
812 nf_nat_setup_info(ct
, &range
, NF_IP_POST_ROUTING
);
817 /* Be careful here, modifying NAT bits can screw up things,
818 * so don't let users modify them directly if they don't pass
820 ct
->status
|= status
& ~(IPS_NAT_DONE_MASK
| IPS_NAT_MASK
);
826 ctnetlink_change_helper(struct nf_conn
*ct
, struct nfattr
*cda
[])
828 struct nf_conntrack_helper
*helper
;
829 struct nf_conn_help
*help
= nfct_help(ct
);
833 /* don't change helper of sibling connections */
837 err
= ctnetlink_parse_help(cda
[CTA_HELP
-1], &helpname
);
841 if (!strcmp(helpname
, "")) {
842 if (help
&& help
->helper
) {
843 /* we had a helper before ... */
844 nf_ct_remove_expectations(ct
);
852 /* FIXME: we need to reallocate and rehash */
856 helper
= __nf_conntrack_helper_find_byname(helpname
);
860 if (help
->helper
== helper
)
864 /* we had a helper before ... */
865 nf_ct_remove_expectations(ct
);
867 /* need to zero data of old helper */
868 memset(&help
->help
, 0, sizeof(help
->help
));
869 help
->helper
= helper
;
875 ctnetlink_change_timeout(struct nf_conn
*ct
, struct nfattr
*cda
[])
877 u_int32_t timeout
= ntohl(*(__be32
*)NFA_DATA(cda
[CTA_TIMEOUT
-1]));
879 if (!del_timer(&ct
->timeout
))
882 ct
->timeout
.expires
= jiffies
+ timeout
* HZ
;
883 add_timer(&ct
->timeout
);
889 ctnetlink_change_protoinfo(struct nf_conn
*ct
, struct nfattr
*cda
[])
891 struct nfattr
*tb
[CTA_PROTOINFO_MAX
], *attr
= cda
[CTA_PROTOINFO
-1];
892 struct nf_conntrack_l4proto
*l4proto
;
893 u_int16_t npt
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.protonum
;
894 u_int16_t l3num
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
;
897 nfattr_parse_nested(tb
, CTA_PROTOINFO_MAX
, attr
);
899 l4proto
= nf_ct_l4proto_find_get(l3num
, npt
);
901 if (l4proto
->from_nfattr
)
902 err
= l4proto
->from_nfattr(tb
, ct
);
903 nf_ct_l4proto_put(l4proto
);
909 ctnetlink_change_conntrack(struct nf_conn
*ct
, struct nfattr
*cda
[])
913 if (cda
[CTA_HELP
-1]) {
914 err
= ctnetlink_change_helper(ct
, cda
);
919 if (cda
[CTA_TIMEOUT
-1]) {
920 err
= ctnetlink_change_timeout(ct
, cda
);
925 if (cda
[CTA_STATUS
-1]) {
926 err
= ctnetlink_change_status(ct
, cda
);
931 if (cda
[CTA_PROTOINFO
-1]) {
932 err
= ctnetlink_change_protoinfo(ct
, cda
);
937 #if defined(CONFIG_NF_CONNTRACK_MARK)
939 ct
->mark
= ntohl(*(__be32
*)NFA_DATA(cda
[CTA_MARK
-1]));
946 ctnetlink_create_conntrack(struct nfattr
*cda
[],
947 struct nf_conntrack_tuple
*otuple
,
948 struct nf_conntrack_tuple
*rtuple
)
952 struct nf_conn_help
*help
;
954 ct
= nf_conntrack_alloc(otuple
, rtuple
);
955 if (ct
== NULL
|| IS_ERR(ct
))
958 if (!cda
[CTA_TIMEOUT
-1])
960 ct
->timeout
.expires
= ntohl(*(__be32
*)NFA_DATA(cda
[CTA_TIMEOUT
-1]));
962 ct
->timeout
.expires
= jiffies
+ ct
->timeout
.expires
* HZ
;
963 ct
->status
|= IPS_CONFIRMED
;
965 if (cda
[CTA_STATUS
-1]) {
966 err
= ctnetlink_change_status(ct
, cda
);
971 if (cda
[CTA_PROTOINFO
-1]) {
972 err
= ctnetlink_change_protoinfo(ct
, cda
);
977 #if defined(CONFIG_NF_CONNTRACK_MARK)
979 ct
->mark
= ntohl(*(__be32
*)NFA_DATA(cda
[CTA_MARK
-1]));
982 help
= nfct_help(ct
);
984 help
->helper
= nf_ct_helper_find_get(rtuple
);
986 add_timer(&ct
->timeout
);
987 nf_conntrack_hash_insert(ct
);
989 if (help
&& help
->helper
)
990 nf_ct_helper_put(help
->helper
);
995 nf_conntrack_free(ct
);
1000 ctnetlink_new_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
1001 struct nlmsghdr
*nlh
, struct nfattr
*cda
[])
1003 struct nf_conntrack_tuple otuple
, rtuple
;
1004 struct nf_conntrack_tuple_hash
*h
= NULL
;
1005 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1006 u_int8_t u3
= nfmsg
->nfgen_family
;
1009 if (nfattr_bad_size(cda
, CTA_MAX
, cta_min
))
1012 if (cda
[CTA_TUPLE_ORIG
-1]) {
1013 err
= ctnetlink_parse_tuple(cda
, &otuple
, CTA_TUPLE_ORIG
, u3
);
1018 if (cda
[CTA_TUPLE_REPLY
-1]) {
1019 err
= ctnetlink_parse_tuple(cda
, &rtuple
, CTA_TUPLE_REPLY
, u3
);
1024 write_lock_bh(&nf_conntrack_lock
);
1025 if (cda
[CTA_TUPLE_ORIG
-1])
1026 h
= __nf_conntrack_find(&otuple
, NULL
);
1027 else if (cda
[CTA_TUPLE_REPLY
-1])
1028 h
= __nf_conntrack_find(&rtuple
, NULL
);
1031 write_unlock_bh(&nf_conntrack_lock
);
1033 if (nlh
->nlmsg_flags
& NLM_F_CREATE
)
1034 err
= ctnetlink_create_conntrack(cda
, &otuple
, &rtuple
);
1037 /* implicit 'else' */
1039 /* we only allow nat config for new conntracks */
1040 if (cda
[CTA_NAT_SRC
-1] || cda
[CTA_NAT_DST
-1]) {
1045 /* We manipulate the conntrack inside the global conntrack table lock,
1046 * so there's no need to increase the refcount */
1048 if (!(nlh
->nlmsg_flags
& NLM_F_EXCL
))
1049 err
= ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h
), cda
);
1052 write_unlock_bh(&nf_conntrack_lock
);
1056 /***********************************************************************
1058 ***********************************************************************/
1061 ctnetlink_exp_dump_tuple(struct sk_buff
*skb
,
1062 const struct nf_conntrack_tuple
*tuple
,
1063 enum ctattr_expect type
)
1065 struct nfattr
*nest_parms
= NFA_NEST(skb
, type
);
1067 if (ctnetlink_dump_tuples(skb
, tuple
) < 0)
1068 goto nfattr_failure
;
1070 NFA_NEST_END(skb
, nest_parms
);
1079 ctnetlink_exp_dump_mask(struct sk_buff
*skb
,
1080 const struct nf_conntrack_tuple
*tuple
,
1081 const struct nf_conntrack_tuple
*mask
)
1084 struct nf_conntrack_l3proto
*l3proto
;
1085 struct nf_conntrack_l4proto
*l4proto
;
1086 struct nfattr
*nest_parms
= NFA_NEST(skb
, CTA_EXPECT_MASK
);
1088 l3proto
= nf_ct_l3proto_find_get(tuple
->src
.l3num
);
1089 ret
= ctnetlink_dump_tuples_ip(skb
, mask
, l3proto
);
1090 nf_ct_l3proto_put(l3proto
);
1092 if (unlikely(ret
< 0))
1093 goto nfattr_failure
;
1095 l4proto
= nf_ct_l4proto_find_get(tuple
->src
.l3num
, tuple
->dst
.protonum
);
1096 ret
= ctnetlink_dump_tuples_proto(skb
, mask
, l4proto
);
1097 nf_ct_l4proto_put(l4proto
);
1098 if (unlikely(ret
< 0))
1099 goto nfattr_failure
;
1101 NFA_NEST_END(skb
, nest_parms
);
1110 ctnetlink_exp_dump_expect(struct sk_buff
*skb
,
1111 const struct nf_conntrack_expect
*exp
)
1113 struct nf_conn
*master
= exp
->master
;
1114 __be32 timeout
= htonl((exp
->timeout
.expires
- jiffies
) / HZ
);
1115 __be32 id
= htonl(exp
->id
);
1117 if (ctnetlink_exp_dump_tuple(skb
, &exp
->tuple
, CTA_EXPECT_TUPLE
) < 0)
1118 goto nfattr_failure
;
1119 if (ctnetlink_exp_dump_mask(skb
, &exp
->tuple
, &exp
->mask
) < 0)
1120 goto nfattr_failure
;
1121 if (ctnetlink_exp_dump_tuple(skb
,
1122 &master
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
,
1123 CTA_EXPECT_MASTER
) < 0)
1124 goto nfattr_failure
;
1126 NFA_PUT(skb
, CTA_EXPECT_TIMEOUT
, sizeof(timeout
), &timeout
);
1127 NFA_PUT(skb
, CTA_EXPECT_ID
, sizeof(u_int32_t
), &id
);
1136 ctnetlink_exp_fill_info(struct sk_buff
*skb
, u32 pid
, u32 seq
,
1139 const struct nf_conntrack_expect
*exp
)
1141 struct nlmsghdr
*nlh
;
1142 struct nfgenmsg
*nfmsg
;
1143 unsigned char *b
= skb_tail_pointer(skb
);
1145 event
|= NFNL_SUBSYS_CTNETLINK_EXP
<< 8;
1146 nlh
= NLMSG_PUT(skb
, pid
, seq
, event
, sizeof(struct nfgenmsg
));
1147 nfmsg
= NLMSG_DATA(nlh
);
1149 nlh
->nlmsg_flags
= (nowait
&& pid
) ? NLM_F_MULTI
: 0;
1150 nfmsg
->nfgen_family
= exp
->tuple
.src
.l3num
;
1151 nfmsg
->version
= NFNETLINK_V0
;
1154 if (ctnetlink_exp_dump_expect(skb
, exp
) < 0)
1155 goto nfattr_failure
;
1157 nlh
->nlmsg_len
= skb_tail_pointer(skb
) - b
;
1166 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1167 static int ctnetlink_expect_event(struct notifier_block
*this,
1168 unsigned long events
, void *ptr
)
1170 struct nlmsghdr
*nlh
;
1171 struct nfgenmsg
*nfmsg
;
1172 struct nf_conntrack_expect
*exp
= (struct nf_conntrack_expect
*)ptr
;
1173 struct sk_buff
*skb
;
1178 if (events
& IPEXP_NEW
) {
1179 type
= IPCTNL_MSG_EXP_NEW
;
1180 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
1184 if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW
))
1187 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_ATOMIC
);
1193 type
|= NFNL_SUBSYS_CTNETLINK_EXP
<< 8;
1194 nlh
= NLMSG_PUT(skb
, 0, 0, type
, sizeof(struct nfgenmsg
));
1195 nfmsg
= NLMSG_DATA(nlh
);
1197 nlh
->nlmsg_flags
= flags
;
1198 nfmsg
->nfgen_family
= exp
->tuple
.src
.l3num
;
1199 nfmsg
->version
= NFNETLINK_V0
;
1202 if (ctnetlink_exp_dump_expect(skb
, exp
) < 0)
1203 goto nfattr_failure
;
1205 nlh
->nlmsg_len
= skb
->tail
- b
;
1206 nfnetlink_send(skb
, 0, NFNLGRP_CONNTRACK_EXP_NEW
, 0);
1217 ctnetlink_exp_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1219 struct nf_conntrack_expect
*exp
= NULL
;
1220 struct list_head
*i
;
1221 u_int32_t
*id
= (u_int32_t
*) &cb
->args
[0];
1222 struct nfgenmsg
*nfmsg
= NLMSG_DATA(cb
->nlh
);
1223 u_int8_t l3proto
= nfmsg
->nfgen_family
;
1225 read_lock_bh(&nf_conntrack_lock
);
1226 list_for_each_prev(i
, &nf_conntrack_expect_list
) {
1227 exp
= (struct nf_conntrack_expect
*) i
;
1228 if (l3proto
&& exp
->tuple
.src
.l3num
!= l3proto
)
1232 if (ctnetlink_exp_fill_info(skb
, NETLINK_CB(cb
->skb
).pid
,
1240 read_unlock_bh(&nf_conntrack_lock
);
1245 static const size_t cta_min_exp
[CTA_EXPECT_MAX
] = {
1246 [CTA_EXPECT_TIMEOUT
-1] = sizeof(u_int32_t
),
1247 [CTA_EXPECT_ID
-1] = sizeof(u_int32_t
)
1251 ctnetlink_get_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1252 struct nlmsghdr
*nlh
, struct nfattr
*cda
[])
1254 struct nf_conntrack_tuple tuple
;
1255 struct nf_conntrack_expect
*exp
;
1256 struct sk_buff
*skb2
;
1257 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1258 u_int8_t u3
= nfmsg
->nfgen_family
;
1261 if (nfattr_bad_size(cda
, CTA_EXPECT_MAX
, cta_min_exp
))
1264 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1265 return netlink_dump_start(ctnl
, skb
, nlh
,
1266 ctnetlink_exp_dump_table
,
1270 if (cda
[CTA_EXPECT_MASTER
-1])
1271 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_MASTER
, u3
);
1278 exp
= nf_conntrack_expect_find_get(&tuple
);
1282 if (cda
[CTA_EXPECT_ID
-1]) {
1283 __be32 id
= *(__be32
*)NFA_DATA(cda
[CTA_EXPECT_ID
-1]);
1284 if (exp
->id
!= ntohl(id
)) {
1285 nf_conntrack_expect_put(exp
);
1291 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1295 err
= ctnetlink_exp_fill_info(skb2
, NETLINK_CB(skb
).pid
,
1296 nlh
->nlmsg_seq
, IPCTNL_MSG_EXP_NEW
,
1301 nf_conntrack_expect_put(exp
);
1303 return netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).pid
, MSG_DONTWAIT
);
1308 nf_conntrack_expect_put(exp
);
1313 ctnetlink_del_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1314 struct nlmsghdr
*nlh
, struct nfattr
*cda
[])
1316 struct nf_conntrack_expect
*exp
, *tmp
;
1317 struct nf_conntrack_tuple tuple
;
1318 struct nf_conntrack_helper
*h
;
1319 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1320 u_int8_t u3
= nfmsg
->nfgen_family
;
1323 if (nfattr_bad_size(cda
, CTA_EXPECT_MAX
, cta_min_exp
))
1326 if (cda
[CTA_EXPECT_TUPLE
-1]) {
1327 /* delete a single expect by tuple */
1328 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
, u3
);
1332 /* bump usage count to 2 */
1333 exp
= nf_conntrack_expect_find_get(&tuple
);
1337 if (cda
[CTA_EXPECT_ID
-1]) {
1338 __be32 id
= *(__be32
*)NFA_DATA(cda
[CTA_EXPECT_ID
-1]);
1339 if (exp
->id
!= ntohl(id
)) {
1340 nf_conntrack_expect_put(exp
);
1345 /* after list removal, usage count == 1 */
1346 nf_conntrack_unexpect_related(exp
);
1347 /* have to put what we 'get' above.
1348 * after this line usage count == 0 */
1349 nf_conntrack_expect_put(exp
);
1350 } else if (cda
[CTA_EXPECT_HELP_NAME
-1]) {
1351 char *name
= NFA_DATA(cda
[CTA_EXPECT_HELP_NAME
-1]);
1353 /* delete all expectations for this helper */
1354 write_lock_bh(&nf_conntrack_lock
);
1355 h
= __nf_conntrack_helper_find_byname(name
);
1357 write_unlock_bh(&nf_conntrack_lock
);
1360 list_for_each_entry_safe(exp
, tmp
, &nf_conntrack_expect_list
,
1362 struct nf_conn_help
*m_help
= nfct_help(exp
->master
);
1363 if (m_help
->helper
== h
1364 && del_timer(&exp
->timeout
)) {
1365 nf_ct_unlink_expect(exp
);
1366 nf_conntrack_expect_put(exp
);
1369 write_unlock_bh(&nf_conntrack_lock
);
1371 /* This basically means we have to flush everything*/
1372 write_lock_bh(&nf_conntrack_lock
);
1373 list_for_each_entry_safe(exp
, tmp
, &nf_conntrack_expect_list
,
1375 if (del_timer(&exp
->timeout
)) {
1376 nf_ct_unlink_expect(exp
);
1377 nf_conntrack_expect_put(exp
);
1380 write_unlock_bh(&nf_conntrack_lock
);
1386 ctnetlink_change_expect(struct nf_conntrack_expect
*x
, struct nfattr
*cda
[])
1392 ctnetlink_create_expect(struct nfattr
*cda
[], u_int8_t u3
)
1394 struct nf_conntrack_tuple tuple
, mask
, master_tuple
;
1395 struct nf_conntrack_tuple_hash
*h
= NULL
;
1396 struct nf_conntrack_expect
*exp
;
1398 struct nf_conn_help
*help
;
1401 /* caller guarantees that those three CTA_EXPECT_* exist */
1402 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
, u3
);
1405 err
= ctnetlink_parse_tuple(cda
, &mask
, CTA_EXPECT_MASK
, u3
);
1408 err
= ctnetlink_parse_tuple(cda
, &master_tuple
, CTA_EXPECT_MASTER
, u3
);
1412 /* Look for master conntrack of this expectation */
1413 h
= nf_conntrack_find_get(&master_tuple
, NULL
);
1416 ct
= nf_ct_tuplehash_to_ctrack(h
);
1417 help
= nfct_help(ct
);
1419 if (!help
|| !help
->helper
) {
1420 /* such conntrack hasn't got any helper, abort */
1425 exp
= nf_conntrack_expect_alloc(ct
);
1431 exp
->expectfn
= NULL
;
1435 memcpy(&exp
->tuple
, &tuple
, sizeof(struct nf_conntrack_tuple
));
1436 memcpy(&exp
->mask
, &mask
, sizeof(struct nf_conntrack_tuple
));
1438 err
= nf_conntrack_expect_related(exp
);
1439 nf_conntrack_expect_put(exp
);
1442 nf_ct_put(nf_ct_tuplehash_to_ctrack(h
));
1447 ctnetlink_new_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1448 struct nlmsghdr
*nlh
, struct nfattr
*cda
[])
1450 struct nf_conntrack_tuple tuple
;
1451 struct nf_conntrack_expect
*exp
;
1452 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1453 u_int8_t u3
= nfmsg
->nfgen_family
;
1456 if (nfattr_bad_size(cda
, CTA_EXPECT_MAX
, cta_min_exp
))
1459 if (!cda
[CTA_EXPECT_TUPLE
-1]
1460 || !cda
[CTA_EXPECT_MASK
-1]
1461 || !cda
[CTA_EXPECT_MASTER
-1])
1464 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
, u3
);
1468 write_lock_bh(&nf_conntrack_lock
);
1469 exp
= __nf_conntrack_expect_find(&tuple
);
1472 write_unlock_bh(&nf_conntrack_lock
);
1474 if (nlh
->nlmsg_flags
& NLM_F_CREATE
)
1475 err
= ctnetlink_create_expect(cda
, u3
);
1480 if (!(nlh
->nlmsg_flags
& NLM_F_EXCL
))
1481 err
= ctnetlink_change_expect(exp
, cda
);
1482 write_unlock_bh(&nf_conntrack_lock
);
1487 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1488 static struct notifier_block ctnl_notifier
= {
1489 .notifier_call
= ctnetlink_conntrack_event
,
1492 static struct notifier_block ctnl_notifier_exp
= {
1493 .notifier_call
= ctnetlink_expect_event
,
1497 static struct nfnl_callback ctnl_cb
[IPCTNL_MSG_MAX
] = {
1498 [IPCTNL_MSG_CT_NEW
] = { .call
= ctnetlink_new_conntrack
,
1499 .attr_count
= CTA_MAX
, },
1500 [IPCTNL_MSG_CT_GET
] = { .call
= ctnetlink_get_conntrack
,
1501 .attr_count
= CTA_MAX
, },
1502 [IPCTNL_MSG_CT_DELETE
] = { .call
= ctnetlink_del_conntrack
,
1503 .attr_count
= CTA_MAX
, },
1504 [IPCTNL_MSG_CT_GET_CTRZERO
] = { .call
= ctnetlink_get_conntrack
,
1505 .attr_count
= CTA_MAX
, },
1508 static struct nfnl_callback ctnl_exp_cb
[IPCTNL_MSG_EXP_MAX
] = {
1509 [IPCTNL_MSG_EXP_GET
] = { .call
= ctnetlink_get_expect
,
1510 .attr_count
= CTA_EXPECT_MAX
, },
1511 [IPCTNL_MSG_EXP_NEW
] = { .call
= ctnetlink_new_expect
,
1512 .attr_count
= CTA_EXPECT_MAX
, },
1513 [IPCTNL_MSG_EXP_DELETE
] = { .call
= ctnetlink_del_expect
,
1514 .attr_count
= CTA_EXPECT_MAX
, },
1517 static struct nfnetlink_subsystem ctnl_subsys
= {
1518 .name
= "conntrack",
1519 .subsys_id
= NFNL_SUBSYS_CTNETLINK
,
1520 .cb_count
= IPCTNL_MSG_MAX
,
1524 static struct nfnetlink_subsystem ctnl_exp_subsys
= {
1525 .name
= "conntrack_expect",
1526 .subsys_id
= NFNL_SUBSYS_CTNETLINK_EXP
,
1527 .cb_count
= IPCTNL_MSG_EXP_MAX
,
1531 MODULE_ALIAS("ip_conntrack_netlink");
1532 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK
);
1533 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP
);
1535 static int __init
ctnetlink_init(void)
1539 printk("ctnetlink v%s: registering with nfnetlink.\n", version
);
1540 ret
= nfnetlink_subsys_register(&ctnl_subsys
);
1542 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1546 ret
= nfnetlink_subsys_register(&ctnl_exp_subsys
);
1548 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1549 goto err_unreg_subsys
;
1552 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1553 ret
= nf_conntrack_register_notifier(&ctnl_notifier
);
1555 printk("ctnetlink_init: cannot register notifier.\n");
1556 goto err_unreg_exp_subsys
;
1559 ret
= nf_conntrack_expect_register_notifier(&ctnl_notifier_exp
);
1561 printk("ctnetlink_init: cannot expect register notifier.\n");
1562 goto err_unreg_notifier
;
1568 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1570 nf_conntrack_unregister_notifier(&ctnl_notifier
);
1571 err_unreg_exp_subsys
:
1572 nfnetlink_subsys_unregister(&ctnl_exp_subsys
);
1575 nfnetlink_subsys_unregister(&ctnl_subsys
);
1580 static void __exit
ctnetlink_exit(void)
1582 printk("ctnetlink: unregistering from nfnetlink.\n");
1584 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1585 nf_conntrack_expect_unregister_notifier(&ctnl_notifier_exp
);
1586 nf_conntrack_unregister_notifier(&ctnl_notifier
);
1589 nfnetlink_subsys_unregister(&ctnl_exp_subsys
);
1590 nfnetlink_subsys_unregister(&ctnl_subsys
);
1594 module_init(ctnetlink_init
);
1595 module_exit(ctnetlink_exit
);