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) 2002-2005 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005 by Pablo Neira Ayuso <pablo@eurodev.net>
9 * I've reworked this stuff to use attributes instead of conntrack
10 * structures. 5.44 am. I need more tea. --pablo 05/07/11.
12 * Initial connection tracking via netlink development funded and
13 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
15 * Further development of this code funded by Astaro AG (http://www.astaro.com)
17 * This software may be used and distributed according to the terms
18 * of the GNU General Public License, incorporated herein by reference.
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/kernel.h>
24 #include <linux/types.h>
25 #include <linux/timer.h>
26 #include <linux/skbuff.h>
27 #include <linux/errno.h>
28 #include <linux/netlink.h>
29 #include <linux/spinlock.h>
30 #include <linux/interrupt.h>
31 #include <linux/notifier.h>
33 #include <linux/netfilter.h>
34 #include <linux/netfilter_ipv4/ip_conntrack.h>
35 #include <linux/netfilter_ipv4/ip_conntrack_core.h>
36 #include <linux/netfilter_ipv4/ip_conntrack_helper.h>
37 #include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
38 #include <linux/netfilter_ipv4/ip_nat_protocol.h>
40 #include <linux/netfilter/nfnetlink.h>
41 #include <linux/netfilter/nfnetlink_conntrack.h>
43 MODULE_LICENSE("GPL");
45 static char __initdata version
[] = "0.90";
50 #define DEBUGP(format, args...)
55 ctnetlink_dump_tuples_proto(struct sk_buff
*skb
,
56 const struct ip_conntrack_tuple
*tuple
)
58 struct ip_conntrack_protocol
*proto
;
61 NFA_PUT(skb
, CTA_PROTO_NUM
, sizeof(u_int8_t
), &tuple
->dst
.protonum
);
63 /* If no protocol helper is found, this function will return the
64 * generic protocol helper, so proto won't *ever* be NULL */
65 proto
= ip_conntrack_proto_find_get(tuple
->dst
.protonum
);
66 if (likely(proto
->tuple_to_nfattr
))
67 ret
= proto
->tuple_to_nfattr(skb
, tuple
);
69 ip_conntrack_proto_put(proto
);
78 ctnetlink_dump_tuples(struct sk_buff
*skb
,
79 const struct ip_conntrack_tuple
*tuple
)
81 struct nfattr
*nest_parms
;
84 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_IP
);
85 NFA_PUT(skb
, CTA_IP_V4_SRC
, sizeof(u_int32_t
), &tuple
->src
.ip
);
86 NFA_PUT(skb
, CTA_IP_V4_DST
, sizeof(u_int32_t
), &tuple
->dst
.ip
);
87 NFA_NEST_END(skb
, nest_parms
);
89 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_PROTO
);
90 ret
= ctnetlink_dump_tuples_proto(skb
, tuple
);
91 NFA_NEST_END(skb
, nest_parms
);
100 ctnetlink_dump_status(struct sk_buff
*skb
, const struct ip_conntrack
*ct
)
102 u_int32_t status
= htonl((u_int32_t
) ct
->status
);
103 NFA_PUT(skb
, CTA_STATUS
, sizeof(status
), &status
);
111 ctnetlink_dump_timeout(struct sk_buff
*skb
, const struct ip_conntrack
*ct
)
113 long timeout_l
= ct
->timeout
.expires
- jiffies
;
119 timeout
= htonl(timeout_l
/ HZ
);
121 NFA_PUT(skb
, CTA_TIMEOUT
, sizeof(timeout
), &timeout
);
129 ctnetlink_dump_protoinfo(struct sk_buff
*skb
, const struct ip_conntrack
*ct
)
131 struct ip_conntrack_protocol
*proto
= ip_conntrack_proto_find_get(ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.protonum
);
133 struct nfattr
*nest_proto
;
136 if (!proto
->to_nfattr
) {
137 ip_conntrack_proto_put(proto
);
141 nest_proto
= NFA_NEST(skb
, CTA_PROTOINFO
);
143 ret
= proto
->to_nfattr(skb
, nest_proto
, ct
);
145 ip_conntrack_proto_put(proto
);
147 NFA_NEST_END(skb
, nest_proto
);
156 ctnetlink_dump_helpinfo(struct sk_buff
*skb
, const struct ip_conntrack
*ct
)
158 struct nfattr
*nest_helper
;
163 nest_helper
= NFA_NEST(skb
, CTA_HELP
);
164 NFA_PUT(skb
, CTA_HELP_NAME
, CTA_HELP_MAXNAMESIZE
, &ct
->helper
->name
);
166 if (ct
->helper
->to_nfattr
)
167 ct
->helper
->to_nfattr(skb
, ct
);
169 NFA_NEST_END(skb
, nest_helper
);
177 #ifdef CONFIG_IP_NF_CT_ACCT
179 ctnetlink_dump_counters(struct sk_buff
*skb
, const struct ip_conntrack
*ct
,
180 enum ip_conntrack_dir dir
)
182 enum ctattr_type type
= dir
? CTA_COUNTERS_REPLY
: CTA_COUNTERS_ORIG
;
183 struct nfattr
*nest_count
= NFA_NEST(skb
, type
);
186 tmp
= htonl(ct
->counters
[dir
].packets
);
187 NFA_PUT(skb
, CTA_COUNTERS32_PACKETS
, sizeof(u_int32_t
), &tmp
);
189 tmp
= htonl(ct
->counters
[dir
].bytes
);
190 NFA_PUT(skb
, CTA_COUNTERS32_BYTES
, sizeof(u_int32_t
), &tmp
);
192 NFA_NEST_END(skb
, nest_count
);
200 #define ctnetlink_dump_counters(a, b, c) (0)
203 #ifdef CONFIG_IP_NF_CONNTRACK_MARK
205 ctnetlink_dump_mark(struct sk_buff
*skb
, const struct ip_conntrack
*ct
)
207 u_int32_t mark
= htonl(ct
->mark
);
209 NFA_PUT(skb
, CTA_MARK
, sizeof(u_int32_t
), &mark
);
216 #define ctnetlink_dump_mark(a, b) (0)
220 ctnetlink_dump_id(struct sk_buff
*skb
, const struct ip_conntrack
*ct
)
222 u_int32_t id
= htonl(ct
->id
);
223 NFA_PUT(skb
, CTA_ID
, sizeof(u_int32_t
), &id
);
231 ctnetlink_dump_use(struct sk_buff
*skb
, const struct ip_conntrack
*ct
)
233 u_int32_t use
= htonl(atomic_read(&ct
->ct_general
.use
));
235 NFA_PUT(skb
, CTA_USE
, sizeof(u_int32_t
), &use
);
242 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
245 ctnetlink_fill_info(struct sk_buff
*skb
, u32 pid
, u32 seq
,
246 int event
, int nowait
,
247 const struct ip_conntrack
*ct
)
249 struct nlmsghdr
*nlh
;
250 struct nfgenmsg
*nfmsg
;
251 struct nfattr
*nest_parms
;
256 event
|= NFNL_SUBSYS_CTNETLINK
<< 8;
257 nlh
= NLMSG_PUT(skb
, pid
, seq
, event
, sizeof(struct nfgenmsg
));
258 nfmsg
= NLMSG_DATA(nlh
);
260 nlh
->nlmsg_flags
= (nowait
&& pid
) ? NLM_F_MULTI
: 0;
261 nfmsg
->nfgen_family
= AF_INET
;
262 nfmsg
->version
= NFNETLINK_V0
;
265 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_ORIG
);
266 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
268 NFA_NEST_END(skb
, nest_parms
);
270 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_REPLY
);
271 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
273 NFA_NEST_END(skb
, nest_parms
);
275 if (ctnetlink_dump_status(skb
, ct
) < 0 ||
276 ctnetlink_dump_timeout(skb
, ct
) < 0 ||
277 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
278 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0 ||
279 ctnetlink_dump_protoinfo(skb
, ct
) < 0 ||
280 ctnetlink_dump_helpinfo(skb
, ct
) < 0 ||
281 ctnetlink_dump_mark(skb
, ct
) < 0 ||
282 ctnetlink_dump_id(skb
, ct
) < 0 ||
283 ctnetlink_dump_use(skb
, ct
) < 0)
286 nlh
->nlmsg_len
= skb
->tail
- b
;
291 skb_trim(skb
, b
- skb
->data
);
295 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
296 static int ctnetlink_conntrack_event(struct notifier_block
*this,
297 unsigned long events
, void *ptr
)
299 struct nlmsghdr
*nlh
;
300 struct nfgenmsg
*nfmsg
;
301 struct nfattr
*nest_parms
;
302 struct ip_conntrack
*ct
= (struct ip_conntrack
*)ptr
;
306 unsigned int flags
= 0, group
;
308 /* ignore our fake conntrack entry */
309 if (ct
== &ip_conntrack_untracked
)
312 if (events
& IPCT_DESTROY
) {
313 type
= IPCTNL_MSG_CT_DELETE
;
314 group
= NFNLGRP_CONNTRACK_DESTROY
;
315 } else if (events
& (IPCT_NEW
| IPCT_RELATED
)) {
316 type
= IPCTNL_MSG_CT_NEW
;
317 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
318 /* dump everything */
320 group
= NFNLGRP_CONNTRACK_NEW
;
321 } else if (events
& (IPCT_STATUS
|
326 type
= IPCTNL_MSG_CT_NEW
;
327 group
= NFNLGRP_CONNTRACK_UPDATE
;
331 /* FIXME: Check if there are any listeners before, don't hurt performance */
333 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_ATOMIC
);
339 type
|= NFNL_SUBSYS_CTNETLINK
<< 8;
340 nlh
= NLMSG_PUT(skb
, 0, 0, type
, sizeof(struct nfgenmsg
));
341 nfmsg
= NLMSG_DATA(nlh
);
343 nlh
->nlmsg_flags
= flags
;
344 nfmsg
->nfgen_family
= AF_INET
;
345 nfmsg
->version
= NFNETLINK_V0
;
348 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_ORIG
);
349 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
351 NFA_NEST_END(skb
, nest_parms
);
353 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_REPLY
);
354 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
356 NFA_NEST_END(skb
, nest_parms
);
358 /* NAT stuff is now a status flag */
359 if ((events
& IPCT_STATUS
|| events
& IPCT_NATINFO
)
360 && ctnetlink_dump_status(skb
, ct
) < 0)
362 if (events
& IPCT_REFRESH
363 && ctnetlink_dump_timeout(skb
, ct
) < 0)
365 if (events
& IPCT_PROTOINFO
366 && ctnetlink_dump_protoinfo(skb
, ct
) < 0)
368 if (events
& IPCT_HELPINFO
369 && ctnetlink_dump_helpinfo(skb
, ct
) < 0)
372 if (ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
373 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0)
376 nlh
->nlmsg_len
= skb
->tail
- b
;
377 nfnetlink_send(skb
, 0, group
, 0);
385 #endif /* CONFIG_IP_NF_CONNTRACK_EVENTS */
387 static int ctnetlink_done(struct netlink_callback
*cb
)
389 DEBUGP("entered %s\n", __FUNCTION__
);
394 ctnetlink_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
396 struct ip_conntrack
*ct
= NULL
;
397 struct ip_conntrack_tuple_hash
*h
;
399 u_int32_t
*id
= (u_int32_t
*) &cb
->args
[1];
401 DEBUGP("entered %s, last bucket=%lu id=%u\n", __FUNCTION__
,
404 read_lock_bh(&ip_conntrack_lock
);
405 for (; cb
->args
[0] < ip_conntrack_htable_size
; cb
->args
[0]++, *id
= 0) {
406 list_for_each_prev(i
, &ip_conntrack_hash
[cb
->args
[0]]) {
407 h
= (struct ip_conntrack_tuple_hash
*) i
;
408 if (DIRECTION(h
) != IP_CT_DIR_ORIGINAL
)
410 ct
= tuplehash_to_ctrack(h
);
413 if (ctnetlink_fill_info(skb
, NETLINK_CB(cb
->skb
).pid
,
422 read_unlock_bh(&ip_conntrack_lock
);
424 DEBUGP("leaving, last bucket=%lu id=%u\n", cb
->args
[0], *id
);
429 #ifdef CONFIG_IP_NF_CT_ACCT
431 ctnetlink_dump_table_w(struct sk_buff
*skb
, struct netlink_callback
*cb
)
433 struct ip_conntrack
*ct
= NULL
;
434 struct ip_conntrack_tuple_hash
*h
;
436 u_int32_t
*id
= (u_int32_t
*) &cb
->args
[1];
438 DEBUGP("entered %s, last bucket=%u id=%u\n", __FUNCTION__
,
441 write_lock_bh(&ip_conntrack_lock
);
442 for (; cb
->args
[0] < ip_conntrack_htable_size
; cb
->args
[0]++, *id
= 0) {
443 list_for_each_prev(i
, &ip_conntrack_hash
[cb
->args
[0]]) {
444 h
= (struct ip_conntrack_tuple_hash
*) i
;
445 if (DIRECTION(h
) != IP_CT_DIR_ORIGINAL
)
447 ct
= tuplehash_to_ctrack(h
);
450 if (ctnetlink_fill_info(skb
, NETLINK_CB(cb
->skb
).pid
,
457 memset(&ct
->counters
, 0, sizeof(ct
->counters
));
461 write_unlock_bh(&ip_conntrack_lock
);
463 DEBUGP("leaving, last bucket=%lu id=%u\n", cb
->args
[0], *id
);
469 static const size_t cta_min_ip
[CTA_IP_MAX
] = {
470 [CTA_IP_V4_SRC
-1] = sizeof(u_int32_t
),
471 [CTA_IP_V4_DST
-1] = sizeof(u_int32_t
),
475 ctnetlink_parse_tuple_ip(struct nfattr
*attr
, struct ip_conntrack_tuple
*tuple
)
477 struct nfattr
*tb
[CTA_IP_MAX
];
479 DEBUGP("entered %s\n", __FUNCTION__
);
481 nfattr_parse_nested(tb
, CTA_IP_MAX
, attr
);
483 if (nfattr_bad_size(tb
, CTA_IP_MAX
, cta_min_ip
))
486 if (!tb
[CTA_IP_V4_SRC
-1])
488 tuple
->src
.ip
= *(u_int32_t
*)NFA_DATA(tb
[CTA_IP_V4_SRC
-1]);
490 if (!tb
[CTA_IP_V4_DST
-1])
492 tuple
->dst
.ip
= *(u_int32_t
*)NFA_DATA(tb
[CTA_IP_V4_DST
-1]);
499 static const size_t cta_min_proto
[CTA_PROTO_MAX
] = {
500 [CTA_PROTO_NUM
-1] = sizeof(u_int8_t
),
501 [CTA_PROTO_SRC_PORT
-1] = sizeof(u_int16_t
),
502 [CTA_PROTO_DST_PORT
-1] = sizeof(u_int16_t
),
503 [CTA_PROTO_ICMP_TYPE
-1] = sizeof(u_int8_t
),
504 [CTA_PROTO_ICMP_CODE
-1] = sizeof(u_int8_t
),
505 [CTA_PROTO_ICMP_ID
-1] = sizeof(u_int16_t
),
509 ctnetlink_parse_tuple_proto(struct nfattr
*attr
,
510 struct ip_conntrack_tuple
*tuple
)
512 struct nfattr
*tb
[CTA_PROTO_MAX
];
513 struct ip_conntrack_protocol
*proto
;
516 DEBUGP("entered %s\n", __FUNCTION__
);
518 nfattr_parse_nested(tb
, CTA_PROTO_MAX
, attr
);
520 if (nfattr_bad_size(tb
, CTA_PROTO_MAX
, cta_min_proto
))
523 if (!tb
[CTA_PROTO_NUM
-1])
525 tuple
->dst
.protonum
= *(u_int8_t
*)NFA_DATA(tb
[CTA_PROTO_NUM
-1]);
527 proto
= ip_conntrack_proto_find_get(tuple
->dst
.protonum
);
529 if (likely(proto
->nfattr_to_tuple
))
530 ret
= proto
->nfattr_to_tuple(tb
, tuple
);
532 ip_conntrack_proto_put(proto
);
538 ctnetlink_parse_tuple(struct nfattr
*cda
[], struct ip_conntrack_tuple
*tuple
,
539 enum ctattr_tuple type
)
541 struct nfattr
*tb
[CTA_TUPLE_MAX
];
544 DEBUGP("entered %s\n", __FUNCTION__
);
546 memset(tuple
, 0, sizeof(*tuple
));
548 nfattr_parse_nested(tb
, CTA_TUPLE_MAX
, cda
[type
-1]);
550 if (!tb
[CTA_TUPLE_IP
-1])
553 err
= ctnetlink_parse_tuple_ip(tb
[CTA_TUPLE_IP
-1], tuple
);
557 if (!tb
[CTA_TUPLE_PROTO
-1])
560 err
= ctnetlink_parse_tuple_proto(tb
[CTA_TUPLE_PROTO
-1], tuple
);
564 /* orig and expect tuples get DIR_ORIGINAL */
565 if (type
== CTA_TUPLE_REPLY
)
566 tuple
->dst
.dir
= IP_CT_DIR_REPLY
;
568 tuple
->dst
.dir
= IP_CT_DIR_ORIGINAL
;
577 #ifdef CONFIG_IP_NF_NAT_NEEDED
578 static const size_t cta_min_protonat
[CTA_PROTONAT_MAX
] = {
579 [CTA_PROTONAT_PORT_MIN
-1] = sizeof(u_int16_t
),
580 [CTA_PROTONAT_PORT_MAX
-1] = sizeof(u_int16_t
),
583 static int ctnetlink_parse_nat_proto(struct nfattr
*attr
,
584 const struct ip_conntrack
*ct
,
585 struct ip_nat_range
*range
)
587 struct nfattr
*tb
[CTA_PROTONAT_MAX
];
588 struct ip_nat_protocol
*npt
;
590 DEBUGP("entered %s\n", __FUNCTION__
);
592 nfattr_parse_nested(tb
, CTA_PROTONAT_MAX
, attr
);
594 if (nfattr_bad_size(tb
, CTA_PROTONAT_MAX
, cta_min_protonat
))
597 npt
= ip_nat_proto_find_get(ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.protonum
);
599 if (!npt
->nfattr_to_range
) {
600 ip_nat_proto_put(npt
);
604 /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
605 if (npt
->nfattr_to_range(tb
, range
) > 0)
606 range
->flags
|= IP_NAT_RANGE_PROTO_SPECIFIED
;
608 ip_nat_proto_put(npt
);
614 static const size_t cta_min_nat
[CTA_NAT_MAX
] = {
615 [CTA_NAT_MINIP
-1] = sizeof(u_int32_t
),
616 [CTA_NAT_MAXIP
-1] = sizeof(u_int32_t
),
620 ctnetlink_parse_nat(struct nfattr
*cda
[],
621 const struct ip_conntrack
*ct
, struct ip_nat_range
*range
)
623 struct nfattr
*tb
[CTA_NAT_MAX
];
626 DEBUGP("entered %s\n", __FUNCTION__
);
628 memset(range
, 0, sizeof(*range
));
630 nfattr_parse_nested(tb
, CTA_NAT_MAX
, cda
[CTA_NAT
-1]);
632 if (nfattr_bad_size(tb
, CTA_NAT_MAX
, cta_min_nat
))
635 if (tb
[CTA_NAT_MINIP
-1])
636 range
->min_ip
= *(u_int32_t
*)NFA_DATA(tb
[CTA_NAT_MINIP
-1]);
638 if (!tb
[CTA_NAT_MAXIP
-1])
639 range
->max_ip
= range
->min_ip
;
641 range
->max_ip
= *(u_int32_t
*)NFA_DATA(tb
[CTA_NAT_MAXIP
-1]);
644 range
->flags
|= IP_NAT_RANGE_MAP_IPS
;
646 if (!tb
[CTA_NAT_PROTO
-1])
649 err
= ctnetlink_parse_nat_proto(tb
[CTA_NAT_PROTO
-1], ct
, range
);
659 ctnetlink_parse_help(struct nfattr
*attr
, char **helper_name
)
661 struct nfattr
*tb
[CTA_HELP_MAX
];
663 DEBUGP("entered %s\n", __FUNCTION__
);
665 nfattr_parse_nested(tb
, CTA_HELP_MAX
, attr
);
667 if (!tb
[CTA_HELP_NAME
-1])
670 *helper_name
= NFA_DATA(tb
[CTA_HELP_NAME
-1]);
675 static const size_t cta_min
[CTA_MAX
] = {
676 [CTA_STATUS
-1] = sizeof(u_int32_t
),
677 [CTA_TIMEOUT
-1] = sizeof(u_int32_t
),
678 [CTA_MARK
-1] = sizeof(u_int32_t
),
679 [CTA_USE
-1] = sizeof(u_int32_t
),
680 [CTA_ID
-1] = sizeof(u_int32_t
)
684 ctnetlink_del_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
685 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
687 struct ip_conntrack_tuple_hash
*h
;
688 struct ip_conntrack_tuple tuple
;
689 struct ip_conntrack
*ct
;
692 DEBUGP("entered %s\n", __FUNCTION__
);
694 if (nfattr_bad_size(cda
, CTA_MAX
, cta_min
))
697 if (cda
[CTA_TUPLE_ORIG
-1])
698 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
);
699 else if (cda
[CTA_TUPLE_REPLY
-1])
700 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
);
702 /* Flush the whole table */
703 ip_conntrack_flush();
710 h
= ip_conntrack_find_get(&tuple
, NULL
);
712 DEBUGP("tuple not found in conntrack hash\n");
716 ct
= tuplehash_to_ctrack(h
);
719 u_int32_t id
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_ID
-1]));
721 ip_conntrack_put(ct
);
725 if (del_timer(&ct
->timeout
))
726 ct
->timeout
.function((unsigned long)ct
);
728 ip_conntrack_put(ct
);
735 ctnetlink_get_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
736 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
738 struct ip_conntrack_tuple_hash
*h
;
739 struct ip_conntrack_tuple tuple
;
740 struct ip_conntrack
*ct
;
741 struct sk_buff
*skb2
= NULL
;
744 DEBUGP("entered %s\n", __FUNCTION__
);
746 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
747 struct nfgenmsg
*msg
= NLMSG_DATA(nlh
);
750 if (msg
->nfgen_family
!= AF_INET
)
751 return -EAFNOSUPPORT
;
753 if (NFNL_MSG_TYPE(nlh
->nlmsg_type
) ==
754 IPCTNL_MSG_CT_GET_CTRZERO
) {
755 #ifdef CONFIG_IP_NF_CT_ACCT
756 if ((*errp
= netlink_dump_start(ctnl
, skb
, nlh
,
757 ctnetlink_dump_table_w
,
758 ctnetlink_done
)) != 0)
764 if ((*errp
= netlink_dump_start(ctnl
, skb
, nlh
,
765 ctnetlink_dump_table
,
766 ctnetlink_done
)) != 0)
770 rlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
777 if (nfattr_bad_size(cda
, CTA_MAX
, cta_min
))
780 if (cda
[CTA_TUPLE_ORIG
-1])
781 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
);
782 else if (cda
[CTA_TUPLE_REPLY
-1])
783 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
);
790 h
= ip_conntrack_find_get(&tuple
, NULL
);
792 DEBUGP("tuple not found in conntrack hash");
795 DEBUGP("tuple found\n");
796 ct
= tuplehash_to_ctrack(h
);
799 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
801 ip_conntrack_put(ct
);
804 NETLINK_CB(skb2
).dst_pid
= NETLINK_CB(skb
).pid
;
806 err
= ctnetlink_fill_info(skb2
, NETLINK_CB(skb
).pid
, nlh
->nlmsg_seq
,
807 IPCTNL_MSG_CT_NEW
, 1, ct
);
808 ip_conntrack_put(ct
);
812 err
= netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).pid
, MSG_DONTWAIT
);
826 ctnetlink_change_status(struct ip_conntrack
*ct
, struct nfattr
*cda
[])
829 unsigned status
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_STATUS
-1]));
830 d
= ct
->status
^ status
;
832 if (d
& (IPS_EXPECTED
|IPS_CONFIRMED
|IPS_DYING
))
836 if (d
& IPS_SEEN_REPLY
&& !(status
& IPS_SEEN_REPLY
))
837 /* SEEN_REPLY bit can only be set */
841 if (d
& IPS_ASSURED
&& !(status
& IPS_ASSURED
))
842 /* ASSURED bit can only be set */
845 if (cda
[CTA_NAT
-1]) {
846 #ifndef CONFIG_IP_NF_NAT_NEEDED
849 unsigned int hooknum
;
850 struct ip_nat_range range
;
852 if (ctnetlink_parse_nat(cda
, ct
, &range
) < 0)
855 DEBUGP("NAT: %u.%u.%u.%u-%u.%u.%u.%u:%u-%u\n",
856 NIPQUAD(range
.min_ip
), NIPQUAD(range
.max_ip
),
857 htons(range
.min
.all
), htons(range
.max
.all
));
859 /* This is tricky but it works. ip_nat_setup_info needs the
860 * hook number as parameter, so let's do the correct
861 * conversion and run away */
862 if (status
& IPS_SRC_NAT_DONE
)
863 hooknum
= NF_IP_POST_ROUTING
; /* IP_NAT_MANIP_SRC */
864 else if (status
& IPS_DST_NAT_DONE
)
865 hooknum
= NF_IP_PRE_ROUTING
; /* IP_NAT_MANIP_DST */
867 return -EINVAL
; /* Missing NAT flags */
869 DEBUGP("NAT status: %lu\n",
870 status
& (IPS_NAT_MASK
| IPS_NAT_DONE_MASK
));
872 if (ip_nat_initialized(ct
, HOOK2MANIP(hooknum
)))
874 ip_nat_setup_info(ct
, &range
, hooknum
);
876 DEBUGP("NAT status after setup_info: %lu\n",
877 ct
->status
& (IPS_NAT_MASK
| IPS_NAT_DONE_MASK
));
881 /* Be careful here, modifying NAT bits can screw up things,
882 * so don't let users modify them directly if they don't pass
884 ct
->status
|= status
& ~(IPS_NAT_DONE_MASK
| IPS_NAT_MASK
);
890 ctnetlink_change_helper(struct ip_conntrack
*ct
, struct nfattr
*cda
[])
892 struct ip_conntrack_helper
*helper
;
896 DEBUGP("entered %s\n", __FUNCTION__
);
898 /* don't change helper of sibling connections */
902 err
= ctnetlink_parse_help(cda
[CTA_HELP
-1], &helpname
);
906 helper
= __ip_conntrack_helper_find_byname(helpname
);
908 if (!strcmp(helpname
, ""))
916 /* we had a helper before ... */
917 ip_ct_remove_expectations(ct
);
920 /* need to zero data of old helper */
921 memset(&ct
->help
, 0, sizeof(ct
->help
));
931 ctnetlink_change_timeout(struct ip_conntrack
*ct
, struct nfattr
*cda
[])
933 u_int32_t timeout
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_TIMEOUT
-1]));
935 if (!del_timer(&ct
->timeout
))
938 ct
->timeout
.expires
= jiffies
+ timeout
* HZ
;
939 add_timer(&ct
->timeout
);
945 ctnetlink_change_protoinfo(struct ip_conntrack
*ct
, struct nfattr
*cda
[])
947 struct nfattr
*tb
[CTA_PROTOINFO_MAX
], *attr
= cda
[CTA_PROTOINFO
-1];
948 struct ip_conntrack_protocol
*proto
;
949 u_int16_t npt
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.protonum
;
952 nfattr_parse_nested(tb
, CTA_PROTOINFO_MAX
, attr
);
954 proto
= ip_conntrack_proto_find_get(npt
);
956 if (proto
->from_nfattr
)
957 err
= proto
->from_nfattr(tb
, ct
);
958 ip_conntrack_proto_put(proto
);
964 ctnetlink_change_conntrack(struct ip_conntrack
*ct
, struct nfattr
*cda
[])
968 DEBUGP("entered %s\n", __FUNCTION__
);
970 if (cda
[CTA_HELP
-1]) {
971 err
= ctnetlink_change_helper(ct
, cda
);
976 if (cda
[CTA_TIMEOUT
-1]) {
977 err
= ctnetlink_change_timeout(ct
, cda
);
982 if (cda
[CTA_STATUS
-1]) {
983 err
= ctnetlink_change_status(ct
, cda
);
988 if (cda
[CTA_PROTOINFO
-1]) {
989 err
= ctnetlink_change_protoinfo(ct
, cda
);
994 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
996 ct
->mark
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_MARK
-1]));
999 DEBUGP("all done\n");
1004 ctnetlink_create_conntrack(struct nfattr
*cda
[],
1005 struct ip_conntrack_tuple
*otuple
,
1006 struct ip_conntrack_tuple
*rtuple
)
1008 struct ip_conntrack
*ct
;
1011 DEBUGP("entered %s\n", __FUNCTION__
);
1013 ct
= ip_conntrack_alloc(otuple
, rtuple
);
1014 if (ct
== NULL
|| IS_ERR(ct
))
1017 if (!cda
[CTA_TIMEOUT
-1])
1019 ct
->timeout
.expires
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_TIMEOUT
-1]));
1021 ct
->timeout
.expires
= jiffies
+ ct
->timeout
.expires
* HZ
;
1022 ct
->status
|= IPS_CONFIRMED
;
1024 err
= ctnetlink_change_status(ct
, cda
);
1028 if (cda
[CTA_PROTOINFO
-1]) {
1029 err
= ctnetlink_change_protoinfo(ct
, cda
);
1034 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
1035 if (cda
[CTA_MARK
-1])
1036 ct
->mark
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_MARK
-1]));
1039 ct
->helper
= ip_conntrack_helper_find_get(rtuple
);
1041 add_timer(&ct
->timeout
);
1042 ip_conntrack_hash_insert(ct
);
1045 ip_conntrack_helper_put(ct
->helper
);
1047 DEBUGP("conntrack with id %u inserted\n", ct
->id
);
1051 ip_conntrack_free(ct
);
1056 ctnetlink_new_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
1057 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1059 struct ip_conntrack_tuple otuple
, rtuple
;
1060 struct ip_conntrack_tuple_hash
*h
= NULL
;
1063 DEBUGP("entered %s\n", __FUNCTION__
);
1065 if (nfattr_bad_size(cda
, CTA_MAX
, cta_min
))
1068 if (cda
[CTA_TUPLE_ORIG
-1]) {
1069 err
= ctnetlink_parse_tuple(cda
, &otuple
, CTA_TUPLE_ORIG
);
1074 if (cda
[CTA_TUPLE_REPLY
-1]) {
1075 err
= ctnetlink_parse_tuple(cda
, &rtuple
, CTA_TUPLE_REPLY
);
1080 write_lock_bh(&ip_conntrack_lock
);
1081 if (cda
[CTA_TUPLE_ORIG
-1])
1082 h
= __ip_conntrack_find(&otuple
, NULL
);
1083 else if (cda
[CTA_TUPLE_REPLY
-1])
1084 h
= __ip_conntrack_find(&rtuple
, NULL
);
1087 write_unlock_bh(&ip_conntrack_lock
);
1088 DEBUGP("no such conntrack, create new\n");
1090 if (nlh
->nlmsg_flags
& NLM_F_CREATE
)
1091 err
= ctnetlink_create_conntrack(cda
, &otuple
, &rtuple
);
1094 /* implicit 'else' */
1096 /* we only allow nat config for new conntracks */
1097 if (cda
[CTA_NAT
-1]) {
1102 /* We manipulate the conntrack inside the global conntrack table lock,
1103 * so there's no need to increase the refcount */
1104 DEBUGP("conntrack found\n");
1106 if (!(nlh
->nlmsg_flags
& NLM_F_EXCL
))
1107 err
= ctnetlink_change_conntrack(tuplehash_to_ctrack(h
), cda
);
1110 write_unlock_bh(&ip_conntrack_lock
);
1114 /***********************************************************************
1116 ***********************************************************************/
1119 ctnetlink_exp_dump_tuple(struct sk_buff
*skb
,
1120 const struct ip_conntrack_tuple
*tuple
,
1121 enum ctattr_expect type
)
1123 struct nfattr
*nest_parms
= NFA_NEST(skb
, type
);
1125 if (ctnetlink_dump_tuples(skb
, tuple
) < 0)
1126 goto nfattr_failure
;
1128 NFA_NEST_END(skb
, nest_parms
);
1137 ctnetlink_exp_dump_expect(struct sk_buff
*skb
,
1138 const struct ip_conntrack_expect
*exp
)
1140 struct ip_conntrack
*master
= exp
->master
;
1141 u_int32_t timeout
= htonl((exp
->timeout
.expires
- jiffies
) / HZ
);
1142 u_int32_t id
= htonl(exp
->id
);
1144 if (ctnetlink_exp_dump_tuple(skb
, &exp
->tuple
, CTA_EXPECT_TUPLE
) < 0)
1145 goto nfattr_failure
;
1146 if (ctnetlink_exp_dump_tuple(skb
, &exp
->mask
, CTA_EXPECT_MASK
) < 0)
1147 goto nfattr_failure
;
1148 if (ctnetlink_exp_dump_tuple(skb
,
1149 &master
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
,
1150 CTA_EXPECT_MASTER
) < 0)
1151 goto nfattr_failure
;
1153 NFA_PUT(skb
, CTA_EXPECT_TIMEOUT
, sizeof(timeout
), &timeout
);
1154 NFA_PUT(skb
, CTA_EXPECT_ID
, sizeof(u_int32_t
), &id
);
1163 ctnetlink_exp_fill_info(struct sk_buff
*skb
, u32 pid
, u32 seq
,
1166 const struct ip_conntrack_expect
*exp
)
1168 struct nlmsghdr
*nlh
;
1169 struct nfgenmsg
*nfmsg
;
1174 event
|= NFNL_SUBSYS_CTNETLINK_EXP
<< 8;
1175 nlh
= NLMSG_PUT(skb
, pid
, seq
, event
, sizeof(struct nfgenmsg
));
1176 nfmsg
= NLMSG_DATA(nlh
);
1178 nlh
->nlmsg_flags
= (nowait
&& pid
) ? NLM_F_MULTI
: 0;
1179 nfmsg
->nfgen_family
= AF_INET
;
1180 nfmsg
->version
= NFNETLINK_V0
;
1183 if (ctnetlink_exp_dump_expect(skb
, exp
) < 0)
1184 goto nfattr_failure
;
1186 nlh
->nlmsg_len
= skb
->tail
- b
;
1191 skb_trim(skb
, b
- skb
->data
);
1195 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1196 static int ctnetlink_expect_event(struct notifier_block
*this,
1197 unsigned long events
, void *ptr
)
1199 struct nlmsghdr
*nlh
;
1200 struct nfgenmsg
*nfmsg
;
1201 struct ip_conntrack_expect
*exp
= (struct ip_conntrack_expect
*)ptr
;
1202 struct sk_buff
*skb
;
1208 if (events
& IPEXP_NEW
) {
1209 type
= IPCTNL_MSG_EXP_NEW
;
1210 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
1214 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_ATOMIC
);
1220 type
|= NFNL_SUBSYS_CTNETLINK
<< 8;
1221 nlh
= NLMSG_PUT(skb
, 0, 0, type
, sizeof(struct nfgenmsg
));
1222 nfmsg
= NLMSG_DATA(nlh
);
1224 nlh
->nlmsg_flags
= flags
;
1225 nfmsg
->nfgen_family
= AF_INET
;
1226 nfmsg
->version
= NFNETLINK_V0
;
1229 if (ctnetlink_exp_dump_expect(skb
, exp
) < 0)
1230 goto nfattr_failure
;
1232 nlh
->nlmsg_len
= skb
->tail
- b
;
1233 proto
= exp
->tuple
.dst
.protonum
;
1234 nfnetlink_send(skb
, 0, NFNLGRP_CONNTRACK_EXP_NEW
, 0);
1245 ctnetlink_exp_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1247 struct ip_conntrack_expect
*exp
= NULL
;
1248 struct list_head
*i
;
1249 u_int32_t
*id
= (u_int32_t
*) &cb
->args
[0];
1251 DEBUGP("entered %s, last id=%llu\n", __FUNCTION__
, *id
);
1253 read_lock_bh(&ip_conntrack_lock
);
1254 list_for_each_prev(i
, &ip_conntrack_expect_list
) {
1255 exp
= (struct ip_conntrack_expect
*) i
;
1258 if (ctnetlink_exp_fill_info(skb
, NETLINK_CB(cb
->skb
).pid
,
1266 read_unlock_bh(&ip_conntrack_lock
);
1268 DEBUGP("leaving, last id=%llu\n", *id
);
1273 static const size_t cta_min_exp
[CTA_EXPECT_MAX
] = {
1274 [CTA_EXPECT_TIMEOUT
-1] = sizeof(u_int32_t
),
1275 [CTA_EXPECT_ID
-1] = sizeof(u_int32_t
)
1279 ctnetlink_get_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1280 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1282 struct ip_conntrack_tuple tuple
;
1283 struct ip_conntrack_expect
*exp
;
1284 struct sk_buff
*skb2
;
1287 DEBUGP("entered %s\n", __FUNCTION__
);
1289 if (nfattr_bad_size(cda
, CTA_EXPECT_MAX
, cta_min_exp
))
1292 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1293 struct nfgenmsg
*msg
= NLMSG_DATA(nlh
);
1296 if (msg
->nfgen_family
!= AF_INET
)
1297 return -EAFNOSUPPORT
;
1299 if ((*errp
= netlink_dump_start(ctnl
, skb
, nlh
,
1300 ctnetlink_exp_dump_table
,
1301 ctnetlink_done
)) != 0)
1303 rlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
1304 if (rlen
> skb
->len
)
1306 skb_pull(skb
, rlen
);
1310 if (cda
[CTA_EXPECT_MASTER
-1])
1311 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_MASTER
);
1318 exp
= ip_conntrack_expect_find(&tuple
);
1322 if (cda
[CTA_EXPECT_ID
-1]) {
1323 u_int32_t id
= *(u_int32_t
*)NFA_DATA(cda
[CTA_EXPECT_ID
-1]);
1324 if (exp
->id
!= ntohl(id
)) {
1325 ip_conntrack_expect_put(exp
);
1331 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1334 NETLINK_CB(skb2
).dst_pid
= NETLINK_CB(skb
).pid
;
1336 err
= ctnetlink_exp_fill_info(skb2
, NETLINK_CB(skb
).pid
,
1337 nlh
->nlmsg_seq
, IPCTNL_MSG_EXP_NEW
,
1342 ip_conntrack_expect_put(exp
);
1344 return netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).pid
, MSG_DONTWAIT
);
1349 ip_conntrack_expect_put(exp
);
1354 ctnetlink_del_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1355 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1357 struct ip_conntrack_expect
*exp
, *tmp
;
1358 struct ip_conntrack_tuple tuple
;
1359 struct ip_conntrack_helper
*h
;
1362 if (nfattr_bad_size(cda
, CTA_EXPECT_MAX
, cta_min_exp
))
1365 if (cda
[CTA_EXPECT_TUPLE
-1]) {
1366 /* delete a single expect by tuple */
1367 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
);
1371 /* bump usage count to 2 */
1372 exp
= ip_conntrack_expect_find(&tuple
);
1376 if (cda
[CTA_EXPECT_ID
-1]) {
1378 *(u_int32_t
*)NFA_DATA(cda
[CTA_EXPECT_ID
-1]);
1379 if (exp
->id
!= ntohl(id
)) {
1380 ip_conntrack_expect_put(exp
);
1385 /* after list removal, usage count == 1 */
1386 ip_conntrack_unexpect_related(exp
);
1387 /* have to put what we 'get' above.
1388 * after this line usage count == 0 */
1389 ip_conntrack_expect_put(exp
);
1390 } else if (cda
[CTA_EXPECT_HELP_NAME
-1]) {
1391 char *name
= NFA_DATA(cda
[CTA_EXPECT_HELP_NAME
-1]);
1393 /* delete all expectations for this helper */
1394 write_lock_bh(&ip_conntrack_lock
);
1395 h
= __ip_conntrack_helper_find_byname(name
);
1397 write_unlock_bh(&ip_conntrack_lock
);
1400 list_for_each_entry_safe(exp
, tmp
, &ip_conntrack_expect_list
,
1402 if (exp
->master
->helper
== h
1403 && del_timer(&exp
->timeout
)) {
1404 ip_ct_unlink_expect(exp
);
1405 ip_conntrack_expect_put(exp
);
1408 write_unlock_bh(&ip_conntrack_lock
);
1410 /* This basically means we have to flush everything*/
1411 write_lock_bh(&ip_conntrack_lock
);
1412 list_for_each_entry_safe(exp
, tmp
, &ip_conntrack_expect_list
,
1414 if (del_timer(&exp
->timeout
)) {
1415 ip_ct_unlink_expect(exp
);
1416 ip_conntrack_expect_put(exp
);
1419 write_unlock_bh(&ip_conntrack_lock
);
1425 ctnetlink_change_expect(struct ip_conntrack_expect
*x
, struct nfattr
*cda
[])
1431 ctnetlink_create_expect(struct nfattr
*cda
[])
1433 struct ip_conntrack_tuple tuple
, mask
, master_tuple
;
1434 struct ip_conntrack_tuple_hash
*h
= NULL
;
1435 struct ip_conntrack_expect
*exp
;
1436 struct ip_conntrack
*ct
;
1439 DEBUGP("entered %s\n", __FUNCTION__
);
1441 /* caller guarantees that those three CTA_EXPECT_* exist */
1442 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
);
1445 err
= ctnetlink_parse_tuple(cda
, &mask
, CTA_EXPECT_MASK
);
1448 err
= ctnetlink_parse_tuple(cda
, &master_tuple
, CTA_EXPECT_MASTER
);
1452 /* Look for master conntrack of this expectation */
1453 h
= ip_conntrack_find_get(&master_tuple
, NULL
);
1456 ct
= tuplehash_to_ctrack(h
);
1459 /* such conntrack hasn't got any helper, abort */
1464 exp
= ip_conntrack_expect_alloc(ct
);
1470 exp
->expectfn
= NULL
;
1473 memcpy(&exp
->tuple
, &tuple
, sizeof(struct ip_conntrack_tuple
));
1474 memcpy(&exp
->mask
, &mask
, sizeof(struct ip_conntrack_tuple
));
1476 err
= ip_conntrack_expect_related(exp
);
1477 ip_conntrack_expect_put(exp
);
1480 ip_conntrack_put(tuplehash_to_ctrack(h
));
1485 ctnetlink_new_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1486 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1488 struct ip_conntrack_tuple tuple
;
1489 struct ip_conntrack_expect
*exp
;
1492 DEBUGP("entered %s\n", __FUNCTION__
);
1494 if (nfattr_bad_size(cda
, CTA_EXPECT_MAX
, cta_min_exp
))
1497 if (!cda
[CTA_EXPECT_TUPLE
-1]
1498 || !cda
[CTA_EXPECT_MASK
-1]
1499 || !cda
[CTA_EXPECT_MASTER
-1])
1502 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
);
1506 write_lock_bh(&ip_conntrack_lock
);
1507 exp
= __ip_conntrack_expect_find(&tuple
);
1510 write_unlock_bh(&ip_conntrack_lock
);
1512 if (nlh
->nlmsg_flags
& NLM_F_CREATE
)
1513 err
= ctnetlink_create_expect(cda
);
1518 if (!(nlh
->nlmsg_flags
& NLM_F_EXCL
))
1519 err
= ctnetlink_change_expect(exp
, cda
);
1520 write_unlock_bh(&ip_conntrack_lock
);
1522 DEBUGP("leaving\n");
1527 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1528 static struct notifier_block ctnl_notifier
= {
1529 .notifier_call
= ctnetlink_conntrack_event
,
1532 static struct notifier_block ctnl_notifier_exp
= {
1533 .notifier_call
= ctnetlink_expect_event
,
1537 static struct nfnl_callback ctnl_cb
[IPCTNL_MSG_MAX
] = {
1538 [IPCTNL_MSG_CT_NEW
] = { .call
= ctnetlink_new_conntrack
,
1539 .attr_count
= CTA_MAX
, },
1540 [IPCTNL_MSG_CT_GET
] = { .call
= ctnetlink_get_conntrack
,
1541 .attr_count
= CTA_MAX
, },
1542 [IPCTNL_MSG_CT_DELETE
] = { .call
= ctnetlink_del_conntrack
,
1543 .attr_count
= CTA_MAX
, },
1544 [IPCTNL_MSG_CT_GET_CTRZERO
] = { .call
= ctnetlink_get_conntrack
,
1545 .attr_count
= CTA_MAX
, },
1548 static struct nfnl_callback ctnl_exp_cb
[IPCTNL_MSG_EXP_MAX
] = {
1549 [IPCTNL_MSG_EXP_GET
] = { .call
= ctnetlink_get_expect
,
1550 .attr_count
= CTA_EXPECT_MAX
, },
1551 [IPCTNL_MSG_EXP_NEW
] = { .call
= ctnetlink_new_expect
,
1552 .attr_count
= CTA_EXPECT_MAX
, },
1553 [IPCTNL_MSG_EXP_DELETE
] = { .call
= ctnetlink_del_expect
,
1554 .attr_count
= CTA_EXPECT_MAX
, },
1557 static struct nfnetlink_subsystem ctnl_subsys
= {
1558 .name
= "conntrack",
1559 .subsys_id
= NFNL_SUBSYS_CTNETLINK
,
1560 .cb_count
= IPCTNL_MSG_MAX
,
1564 static struct nfnetlink_subsystem ctnl_exp_subsys
= {
1565 .name
= "conntrack_expect",
1566 .subsys_id
= NFNL_SUBSYS_CTNETLINK_EXP
,
1567 .cb_count
= IPCTNL_MSG_EXP_MAX
,
1571 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK
);
1573 static int __init
ctnetlink_init(void)
1577 printk("ctnetlink v%s: registering with nfnetlink.\n", version
);
1578 ret
= nfnetlink_subsys_register(&ctnl_subsys
);
1580 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1584 ret
= nfnetlink_subsys_register(&ctnl_exp_subsys
);
1586 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1587 goto err_unreg_subsys
;
1590 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1591 ret
= ip_conntrack_register_notifier(&ctnl_notifier
);
1593 printk("ctnetlink_init: cannot register notifier.\n");
1594 goto err_unreg_exp_subsys
;
1597 ret
= ip_conntrack_expect_register_notifier(&ctnl_notifier_exp
);
1599 printk("ctnetlink_init: cannot expect register notifier.\n");
1600 goto err_unreg_notifier
;
1606 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1608 ip_conntrack_unregister_notifier(&ctnl_notifier
);
1609 err_unreg_exp_subsys
:
1610 nfnetlink_subsys_unregister(&ctnl_exp_subsys
);
1613 nfnetlink_subsys_unregister(&ctnl_subsys
);
1618 static void __exit
ctnetlink_exit(void)
1620 printk("ctnetlink: unregistering from nfnetlink.\n");
1622 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1623 ip_conntrack_unregister_notifier(&ctnl_notifier_exp
);
1624 ip_conntrack_unregister_notifier(&ctnl_notifier
);
1627 nfnetlink_subsys_unregister(&ctnl_exp_subsys
);
1628 nfnetlink_subsys_unregister(&ctnl_subsys
);
1632 module_init(ctnetlink_init
);
1633 module_exit(ctnetlink_exit
);