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/notifier.h>
32 #include <linux/netfilter.h>
33 #include <linux/netfilter_ipv4/ip_conntrack.h>
34 #include <linux/netfilter_ipv4/ip_conntrack_core.h>
35 #include <linux/netfilter_ipv4/ip_conntrack_helper.h>
36 #include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
37 #include <linux/netfilter_ipv4/ip_nat_protocol.h>
39 #include <linux/netfilter/nfnetlink.h>
40 #include <linux/netfilter/nfnetlink_conntrack.h>
42 MODULE_LICENSE("GPL");
44 static char __initdata version
[] = "0.90";
49 #define DEBUGP(format, args...)
54 ctnetlink_dump_tuples_proto(struct sk_buff
*skb
,
55 const struct ip_conntrack_tuple
*tuple
)
57 struct ip_conntrack_protocol
*proto
;
60 NFA_PUT(skb
, CTA_PROTO_NUM
, sizeof(u_int8_t
), &tuple
->dst
.protonum
);
62 proto
= ip_conntrack_proto_find_get(tuple
->dst
.protonum
);
63 if (likely(proto
&& proto
->tuple_to_nfattr
)) {
64 ret
= proto
->tuple_to_nfattr(skb
, tuple
);
65 ip_conntrack_proto_put(proto
);
75 ctnetlink_dump_tuples(struct sk_buff
*skb
,
76 const struct ip_conntrack_tuple
*tuple
)
78 struct nfattr
*nest_parms
;
80 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_IP
);
81 NFA_PUT(skb
, CTA_IP_V4_SRC
, sizeof(u_int32_t
), &tuple
->src
.ip
);
82 NFA_PUT(skb
, CTA_IP_V4_DST
, sizeof(u_int32_t
), &tuple
->dst
.ip
);
83 NFA_NEST_END(skb
, nest_parms
);
85 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_PROTO
);
86 ctnetlink_dump_tuples_proto(skb
, tuple
);
87 NFA_NEST_END(skb
, nest_parms
);
96 ctnetlink_dump_status(struct sk_buff
*skb
, const struct ip_conntrack
*ct
)
98 u_int32_t status
= htonl((u_int32_t
) ct
->status
);
99 NFA_PUT(skb
, CTA_STATUS
, sizeof(status
), &status
);
107 ctnetlink_dump_timeout(struct sk_buff
*skb
, const struct ip_conntrack
*ct
)
109 long timeout_l
= ct
->timeout
.expires
- jiffies
;
115 timeout
= htonl(timeout_l
/ HZ
);
117 NFA_PUT(skb
, CTA_TIMEOUT
, sizeof(timeout
), &timeout
);
125 ctnetlink_dump_protoinfo(struct sk_buff
*skb
, const struct ip_conntrack
*ct
)
127 struct ip_conntrack_protocol
*proto
= ip_conntrack_proto_find_get(ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.protonum
);
129 struct nfattr
*nest_proto
;
132 if (!proto
|| !proto
->to_nfattr
)
135 nest_proto
= NFA_NEST(skb
, CTA_PROTOINFO
);
137 ret
= proto
->to_nfattr(skb
, nest_proto
, ct
);
139 ip_conntrack_proto_put(proto
);
141 NFA_NEST_END(skb
, nest_proto
);
150 ctnetlink_dump_helpinfo(struct sk_buff
*skb
, const struct ip_conntrack
*ct
)
152 struct nfattr
*nest_helper
;
157 nest_helper
= NFA_NEST(skb
, CTA_HELP
);
158 NFA_PUT(skb
, CTA_HELP_NAME
, CTA_HELP_MAXNAMESIZE
, &ct
->helper
->name
);
160 if (ct
->helper
->to_nfattr
)
161 ct
->helper
->to_nfattr(skb
, ct
);
163 NFA_NEST_END(skb
, nest_helper
);
171 #ifdef CONFIG_IP_NF_CT_ACCT
173 ctnetlink_dump_counters(struct sk_buff
*skb
, const struct ip_conntrack
*ct
,
174 enum ip_conntrack_dir dir
)
176 enum ctattr_type type
= dir
? CTA_COUNTERS_REPLY
: CTA_COUNTERS_ORIG
;
177 struct nfattr
*nest_count
= NFA_NEST(skb
, type
);
180 tmp
= htonl(ct
->counters
[dir
].packets
);
181 NFA_PUT(skb
, CTA_COUNTERS32_PACKETS
, sizeof(u_int32_t
), &tmp
);
183 tmp
= htonl(ct
->counters
[dir
].bytes
);
184 NFA_PUT(skb
, CTA_COUNTERS32_BYTES
, sizeof(u_int32_t
), &tmp
);
186 NFA_NEST_END(skb
, nest_count
);
194 #define ctnetlink_dump_counters(a, b, c) (0)
197 #ifdef CONFIG_IP_NF_CONNTRACK_MARK
199 ctnetlink_dump_mark(struct sk_buff
*skb
, const struct ip_conntrack
*ct
)
201 u_int32_t mark
= htonl(ct
->mark
);
203 NFA_PUT(skb
, CTA_MARK
, sizeof(u_int32_t
), &mark
);
210 #define ctnetlink_dump_mark(a, b) (0)
214 ctnetlink_dump_id(struct sk_buff
*skb
, const struct ip_conntrack
*ct
)
216 u_int32_t id
= htonl(ct
->id
);
217 NFA_PUT(skb
, CTA_ID
, sizeof(u_int32_t
), &id
);
225 ctnetlink_dump_use(struct sk_buff
*skb
, const struct ip_conntrack
*ct
)
227 unsigned int use
= htonl(atomic_read(&ct
->ct_general
.use
));
229 NFA_PUT(skb
, CTA_USE
, sizeof(u_int32_t
), &use
);
236 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
239 ctnetlink_fill_info(struct sk_buff
*skb
, u32 pid
, u32 seq
,
240 int event
, int nowait
,
241 const struct ip_conntrack
*ct
)
243 struct nlmsghdr
*nlh
;
244 struct nfgenmsg
*nfmsg
;
245 struct nfattr
*nest_parms
;
250 event
|= NFNL_SUBSYS_CTNETLINK
<< 8;
251 nlh
= NLMSG_PUT(skb
, pid
, seq
, event
, sizeof(struct nfgenmsg
));
252 nfmsg
= NLMSG_DATA(nlh
);
254 nlh
->nlmsg_flags
= (nowait
&& pid
) ? NLM_F_MULTI
: 0;
255 nfmsg
->nfgen_family
= AF_INET
;
256 nfmsg
->version
= NFNETLINK_V0
;
259 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_ORIG
);
260 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
262 NFA_NEST_END(skb
, nest_parms
);
264 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_REPLY
);
265 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
267 NFA_NEST_END(skb
, nest_parms
);
269 if (ctnetlink_dump_status(skb
, ct
) < 0 ||
270 ctnetlink_dump_timeout(skb
, ct
) < 0 ||
271 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
272 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0 ||
273 ctnetlink_dump_protoinfo(skb
, ct
) < 0 ||
274 ctnetlink_dump_helpinfo(skb
, ct
) < 0 ||
275 ctnetlink_dump_mark(skb
, ct
) < 0 ||
276 ctnetlink_dump_id(skb
, ct
) < 0 ||
277 ctnetlink_dump_use(skb
, ct
) < 0)
280 nlh
->nlmsg_len
= skb
->tail
- b
;
285 skb_trim(skb
, b
- skb
->data
);
289 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
290 static int ctnetlink_conntrack_event(struct notifier_block
*this,
291 unsigned long events
, void *ptr
)
293 struct nlmsghdr
*nlh
;
294 struct nfgenmsg
*nfmsg
;
295 struct nfattr
*nest_parms
;
296 struct ip_conntrack
*ct
= (struct ip_conntrack
*)ptr
;
300 unsigned int flags
= 0, group
;
302 /* ignore our fake conntrack entry */
303 if (ct
== &ip_conntrack_untracked
)
306 if (events
& IPCT_DESTROY
) {
307 type
= IPCTNL_MSG_CT_DELETE
;
308 group
= NFNLGRP_CONNTRACK_DESTROY
;
311 if (events
& (IPCT_NEW
| IPCT_RELATED
)) {
312 type
= IPCTNL_MSG_CT_NEW
;
313 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
314 /* dump everything */
316 group
= NFNLGRP_CONNTRACK_NEW
;
319 if (events
& (IPCT_STATUS
|
324 type
= IPCTNL_MSG_CT_NEW
;
325 group
= NFNLGRP_CONNTRACK_UPDATE
;
332 /* FIXME: Check if there are any listeners before, don't hurt performance */
334 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_ATOMIC
);
340 type
|= NFNL_SUBSYS_CTNETLINK
<< 8;
341 nlh
= NLMSG_PUT(skb
, 0, 0, type
, sizeof(struct nfgenmsg
));
342 nfmsg
= NLMSG_DATA(nlh
);
344 nlh
->nlmsg_flags
= flags
;
345 nfmsg
->nfgen_family
= AF_INET
;
346 nfmsg
->version
= NFNETLINK_V0
;
349 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_ORIG
);
350 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
352 NFA_NEST_END(skb
, nest_parms
);
354 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_REPLY
);
355 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
357 NFA_NEST_END(skb
, nest_parms
);
359 /* NAT stuff is now a status flag */
360 if ((events
& IPCT_STATUS
|| events
& IPCT_NATINFO
)
361 && ctnetlink_dump_status(skb
, ct
) < 0)
363 if (events
& IPCT_REFRESH
364 && ctnetlink_dump_timeout(skb
, ct
) < 0)
366 if (events
& IPCT_PROTOINFO
367 && ctnetlink_dump_protoinfo(skb
, ct
) < 0)
369 if (events
& IPCT_HELPINFO
370 && ctnetlink_dump_helpinfo(skb
, ct
) < 0)
373 if (ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
374 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0)
377 nlh
->nlmsg_len
= skb
->tail
- b
;
378 nfnetlink_send(skb
, 0, group
, 0);
386 #endif /* CONFIG_IP_NF_CONNTRACK_EVENTS */
388 static int ctnetlink_done(struct netlink_callback
*cb
)
390 DEBUGP("entered %s\n", __FUNCTION__
);
395 ctnetlink_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
397 struct ip_conntrack
*ct
= NULL
;
398 struct ip_conntrack_tuple_hash
*h
;
400 u_int32_t
*id
= (u_int32_t
*) &cb
->args
[1];
402 DEBUGP("entered %s, last bucket=%lu id=%u\n", __FUNCTION__
,
405 read_lock_bh(&ip_conntrack_lock
);
406 for (; cb
->args
[0] < ip_conntrack_htable_size
; cb
->args
[0]++, *id
= 0) {
407 list_for_each_prev(i
, &ip_conntrack_hash
[cb
->args
[0]]) {
408 h
= (struct ip_conntrack_tuple_hash
*) i
;
409 if (DIRECTION(h
) != IP_CT_DIR_ORIGINAL
)
411 ct
= tuplehash_to_ctrack(h
);
414 if (ctnetlink_fill_info(skb
, NETLINK_CB(cb
->skb
).pid
,
423 read_unlock_bh(&ip_conntrack_lock
);
425 DEBUGP("leaving, last bucket=%lu id=%u\n", cb
->args
[0], *id
);
430 #ifdef CONFIG_IP_NF_CT_ACCT
432 ctnetlink_dump_table_w(struct sk_buff
*skb
, struct netlink_callback
*cb
)
434 struct ip_conntrack
*ct
= NULL
;
435 struct ip_conntrack_tuple_hash
*h
;
437 u_int32_t
*id
= (u_int32_t
*) &cb
->args
[1];
439 DEBUGP("entered %s, last bucket=%u id=%u\n", __FUNCTION__
,
442 write_lock_bh(&ip_conntrack_lock
);
443 for (; cb
->args
[0] < ip_conntrack_htable_size
; cb
->args
[0]++, *id
= 0) {
444 list_for_each_prev(i
, &ip_conntrack_hash
[cb
->args
[0]]) {
445 h
= (struct ip_conntrack_tuple_hash
*) i
;
446 if (DIRECTION(h
) != IP_CT_DIR_ORIGINAL
)
448 ct
= tuplehash_to_ctrack(h
);
451 if (ctnetlink_fill_info(skb
, NETLINK_CB(cb
->skb
).pid
,
458 memset(&ct
->counters
, 0, sizeof(ct
->counters
));
462 write_unlock_bh(&ip_conntrack_lock
);
464 DEBUGP("leaving, last bucket=%lu id=%u\n", cb
->args
[0], *id
);
470 static const size_t cta_min_ip
[CTA_IP_MAX
] = {
471 [CTA_IP_V4_SRC
-1] = sizeof(u_int32_t
),
472 [CTA_IP_V4_DST
-1] = sizeof(u_int32_t
),
476 ctnetlink_parse_tuple_ip(struct nfattr
*attr
, struct ip_conntrack_tuple
*tuple
)
478 struct nfattr
*tb
[CTA_IP_MAX
];
480 DEBUGP("entered %s\n", __FUNCTION__
);
482 nfattr_parse_nested(tb
, CTA_IP_MAX
, attr
);
484 if (nfattr_bad_size(tb
, CTA_IP_MAX
, cta_min_ip
))
487 if (!tb
[CTA_IP_V4_SRC
-1])
489 tuple
->src
.ip
= *(u_int32_t
*)NFA_DATA(tb
[CTA_IP_V4_SRC
-1]);
491 if (!tb
[CTA_IP_V4_DST
-1])
493 tuple
->dst
.ip
= *(u_int32_t
*)NFA_DATA(tb
[CTA_IP_V4_DST
-1]);
500 static const size_t cta_min_proto
[CTA_PROTO_MAX
] = {
501 [CTA_PROTO_NUM
-1] = sizeof(u_int16_t
),
502 [CTA_PROTO_SRC_PORT
-1] = sizeof(u_int16_t
),
503 [CTA_PROTO_DST_PORT
-1] = sizeof(u_int16_t
),
504 [CTA_PROTO_ICMP_TYPE
-1] = sizeof(u_int8_t
),
505 [CTA_PROTO_ICMP_CODE
-1] = sizeof(u_int8_t
),
506 [CTA_PROTO_ICMP_ID
-1] = sizeof(u_int16_t
),
510 ctnetlink_parse_tuple_proto(struct nfattr
*attr
,
511 struct ip_conntrack_tuple
*tuple
)
513 struct nfattr
*tb
[CTA_PROTO_MAX
];
514 struct ip_conntrack_protocol
*proto
;
517 DEBUGP("entered %s\n", __FUNCTION__
);
519 nfattr_parse_nested(tb
, CTA_PROTO_MAX
, attr
);
521 if (nfattr_bad_size(tb
, CTA_PROTO_MAX
, cta_min_proto
))
524 if (!tb
[CTA_PROTO_NUM
-1])
526 tuple
->dst
.protonum
= *(u_int16_t
*)NFA_DATA(tb
[CTA_PROTO_NUM
-1]);
528 proto
= ip_conntrack_proto_find_get(tuple
->dst
.protonum
);
530 if (likely(proto
&& proto
->nfattr_to_tuple
)) {
531 ret
= proto
->nfattr_to_tuple(tb
, tuple
);
532 ip_conntrack_proto_put(proto
);
539 ctnetlink_parse_tuple(struct nfattr
*cda
[], struct ip_conntrack_tuple
*tuple
,
540 enum ctattr_tuple type
)
542 struct nfattr
*tb
[CTA_TUPLE_MAX
];
545 DEBUGP("entered %s\n", __FUNCTION__
);
547 memset(tuple
, 0, sizeof(*tuple
));
549 nfattr_parse_nested(tb
, CTA_TUPLE_MAX
, cda
[type
-1]);
551 if (!tb
[CTA_TUPLE_IP
-1])
554 err
= ctnetlink_parse_tuple_ip(tb
[CTA_TUPLE_IP
-1], tuple
);
558 if (!tb
[CTA_TUPLE_PROTO
-1])
561 err
= ctnetlink_parse_tuple_proto(tb
[CTA_TUPLE_PROTO
-1], tuple
);
565 /* orig and expect tuples get DIR_ORIGINAL */
566 if (type
== CTA_TUPLE_REPLY
)
567 tuple
->dst
.dir
= IP_CT_DIR_REPLY
;
569 tuple
->dst
.dir
= IP_CT_DIR_ORIGINAL
;
578 #ifdef CONFIG_IP_NF_NAT_NEEDED
579 static const size_t cta_min_protonat
[CTA_PROTONAT_MAX
] = {
580 [CTA_PROTONAT_PORT_MIN
-1] = sizeof(u_int16_t
),
581 [CTA_PROTONAT_PORT_MAX
-1] = sizeof(u_int16_t
),
584 static int ctnetlink_parse_nat_proto(struct nfattr
*attr
,
585 const struct ip_conntrack
*ct
,
586 struct ip_nat_range
*range
)
588 struct nfattr
*tb
[CTA_PROTONAT_MAX
];
589 struct ip_nat_protocol
*npt
;
591 DEBUGP("entered %s\n", __FUNCTION__
);
593 nfattr_parse_nested(tb
, CTA_PROTONAT_MAX
, attr
);
595 if (nfattr_bad_size(tb
, CTA_PROTONAT_MAX
, cta_min_protonat
))
598 npt
= ip_nat_proto_find_get(ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.protonum
);
602 if (!npt
->nfattr_to_range
) {
603 ip_nat_proto_put(npt
);
607 /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
608 if (npt
->nfattr_to_range(tb
, range
) > 0)
609 range
->flags
|= IP_NAT_RANGE_PROTO_SPECIFIED
;
611 ip_nat_proto_put(npt
);
617 static const size_t cta_min_nat
[CTA_NAT_MAX
] = {
618 [CTA_NAT_MINIP
-1] = sizeof(u_int32_t
),
619 [CTA_NAT_MAXIP
-1] = sizeof(u_int32_t
),
623 ctnetlink_parse_nat(struct nfattr
*cda
[],
624 const struct ip_conntrack
*ct
, struct ip_nat_range
*range
)
626 struct nfattr
*tb
[CTA_NAT_MAX
];
629 DEBUGP("entered %s\n", __FUNCTION__
);
631 memset(range
, 0, sizeof(*range
));
633 nfattr_parse_nested(tb
, CTA_NAT_MAX
, cda
[CTA_NAT
-1]);
635 if (nfattr_bad_size(tb
, CTA_NAT_MAX
, cta_min_nat
))
638 if (tb
[CTA_NAT_MINIP
-1])
639 range
->min_ip
= *(u_int32_t
*)NFA_DATA(tb
[CTA_NAT_MINIP
-1]);
641 if (!tb
[CTA_NAT_MAXIP
-1])
642 range
->max_ip
= range
->min_ip
;
644 range
->max_ip
= *(u_int32_t
*)NFA_DATA(tb
[CTA_NAT_MAXIP
-1]);
647 range
->flags
|= IP_NAT_RANGE_MAP_IPS
;
649 if (!tb
[CTA_NAT_PROTO
-1])
652 err
= ctnetlink_parse_nat_proto(tb
[CTA_NAT_PROTO
-1], ct
, range
);
662 ctnetlink_parse_help(struct nfattr
*attr
, char **helper_name
)
664 struct nfattr
*tb
[CTA_HELP_MAX
];
666 DEBUGP("entered %s\n", __FUNCTION__
);
668 nfattr_parse_nested(tb
, CTA_HELP_MAX
, attr
);
670 if (!tb
[CTA_HELP_NAME
-1])
673 *helper_name
= NFA_DATA(tb
[CTA_HELP_NAME
-1]);
678 static const size_t cta_min
[CTA_MAX
] = {
679 [CTA_STATUS
-1] = sizeof(u_int32_t
),
680 [CTA_TIMEOUT
-1] = sizeof(u_int32_t
),
681 [CTA_MARK
-1] = sizeof(u_int32_t
),
682 [CTA_USE
-1] = sizeof(u_int32_t
),
683 [CTA_ID
-1] = sizeof(u_int32_t
)
687 ctnetlink_del_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
688 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
690 struct ip_conntrack_tuple_hash
*h
;
691 struct ip_conntrack_tuple tuple
;
692 struct ip_conntrack
*ct
;
695 DEBUGP("entered %s\n", __FUNCTION__
);
697 if (nfattr_bad_size(cda
, CTA_MAX
, cta_min
))
700 if (cda
[CTA_TUPLE_ORIG
-1])
701 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
);
702 else if (cda
[CTA_TUPLE_REPLY
-1])
703 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
);
705 /* Flush the whole table */
706 ip_conntrack_flush();
713 h
= ip_conntrack_find_get(&tuple
, NULL
);
715 DEBUGP("tuple not found in conntrack hash\n");
719 ct
= tuplehash_to_ctrack(h
);
722 u_int32_t id
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_ID
-1]));
724 ip_conntrack_put(ct
);
728 if (del_timer(&ct
->timeout
)) {
729 ip_conntrack_put(ct
);
730 ct
->timeout
.function((unsigned long)ct
);
733 ip_conntrack_put(ct
);
740 ctnetlink_get_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
741 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
743 struct ip_conntrack_tuple_hash
*h
;
744 struct ip_conntrack_tuple tuple
;
745 struct ip_conntrack
*ct
;
746 struct sk_buff
*skb2
= NULL
;
749 DEBUGP("entered %s\n", __FUNCTION__
);
751 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
752 struct nfgenmsg
*msg
= NLMSG_DATA(nlh
);
755 if (msg
->nfgen_family
!= AF_INET
)
756 return -EAFNOSUPPORT
;
758 if (NFNL_MSG_TYPE(nlh
->nlmsg_type
) ==
759 IPCTNL_MSG_CT_GET_CTRZERO
) {
760 #ifdef CONFIG_IP_NF_CT_ACCT
761 if ((*errp
= netlink_dump_start(ctnl
, skb
, nlh
,
762 ctnetlink_dump_table_w
,
763 ctnetlink_done
)) != 0)
769 if ((*errp
= netlink_dump_start(ctnl
, skb
, nlh
,
770 ctnetlink_dump_table
,
771 ctnetlink_done
)) != 0)
775 rlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
782 if (nfattr_bad_size(cda
, CTA_MAX
, cta_min
))
785 if (cda
[CTA_TUPLE_ORIG
-1])
786 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
);
787 else if (cda
[CTA_TUPLE_REPLY
-1])
788 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
);
795 h
= ip_conntrack_find_get(&tuple
, NULL
);
797 DEBUGP("tuple not found in conntrack hash");
800 DEBUGP("tuple found\n");
801 ct
= tuplehash_to_ctrack(h
);
804 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
806 ip_conntrack_put(ct
);
809 NETLINK_CB(skb2
).dst_pid
= NETLINK_CB(skb
).pid
;
811 err
= ctnetlink_fill_info(skb2
, NETLINK_CB(skb
).pid
, nlh
->nlmsg_seq
,
812 IPCTNL_MSG_CT_NEW
, 1, ct
);
813 ip_conntrack_put(ct
);
817 err
= netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).pid
, MSG_DONTWAIT
);
831 ctnetlink_change_status(struct ip_conntrack
*ct
, struct nfattr
*cda
[])
834 unsigned status
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_STATUS
-1]));
835 d
= ct
->status
^ status
;
837 if (d
& (IPS_EXPECTED
|IPS_CONFIRMED
|IPS_DYING
))
841 if (d
& IPS_SEEN_REPLY
&& !(status
& IPS_SEEN_REPLY
))
842 /* SEEN_REPLY bit can only be set */
846 if (d
& IPS_ASSURED
&& !(status
& IPS_ASSURED
))
847 /* ASSURED bit can only be set */
850 if (cda
[CTA_NAT
-1]) {
851 #ifndef CONFIG_IP_NF_NAT_NEEDED
854 unsigned int hooknum
;
855 struct ip_nat_range range
;
857 if (ctnetlink_parse_nat(cda
, ct
, &range
) < 0)
860 DEBUGP("NAT: %u.%u.%u.%u-%u.%u.%u.%u:%u-%u\n",
861 NIPQUAD(range
.min_ip
), NIPQUAD(range
.max_ip
),
862 htons(range
.min
.all
), htons(range
.max
.all
));
864 /* This is tricky but it works. ip_nat_setup_info needs the
865 * hook number as parameter, so let's do the correct
866 * conversion and run away */
867 if (status
& IPS_SRC_NAT_DONE
)
868 hooknum
= NF_IP_POST_ROUTING
; /* IP_NAT_MANIP_SRC */
869 else if (status
& IPS_DST_NAT_DONE
)
870 hooknum
= NF_IP_PRE_ROUTING
; /* IP_NAT_MANIP_DST */
872 return -EINVAL
; /* Missing NAT flags */
874 DEBUGP("NAT status: %lu\n",
875 status
& (IPS_NAT_MASK
| IPS_NAT_DONE_MASK
));
877 if (ip_nat_initialized(ct
, hooknum
))
879 ip_nat_setup_info(ct
, &range
, hooknum
);
881 DEBUGP("NAT status after setup_info: %lu\n",
882 ct
->status
& (IPS_NAT_MASK
| IPS_NAT_DONE_MASK
));
886 /* Be careful here, modifying NAT bits can screw up things,
887 * so don't let users modify them directly if they don't pass
889 ct
->status
|= status
& ~(IPS_NAT_DONE_MASK
| IPS_NAT_MASK
);
895 ctnetlink_change_helper(struct ip_conntrack
*ct
, struct nfattr
*cda
[])
897 struct ip_conntrack_helper
*helper
;
901 DEBUGP("entered %s\n", __FUNCTION__
);
903 /* don't change helper of sibling connections */
907 err
= ctnetlink_parse_help(cda
[CTA_HELP
-1], &helpname
);
911 helper
= __ip_conntrack_helper_find_byname(helpname
);
913 if (!strcmp(helpname
, ""))
921 /* we had a helper before ... */
922 ip_ct_remove_expectations(ct
);
925 /* need to zero data of old helper */
926 memset(&ct
->help
, 0, sizeof(ct
->help
));
936 ctnetlink_change_timeout(struct ip_conntrack
*ct
, struct nfattr
*cda
[])
938 u_int32_t timeout
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_TIMEOUT
-1]));
940 if (!del_timer(&ct
->timeout
))
943 ct
->timeout
.expires
= jiffies
+ timeout
* HZ
;
944 add_timer(&ct
->timeout
);
950 ctnetlink_change_protoinfo(struct ip_conntrack
*ct
, struct nfattr
*cda
[])
952 struct nfattr
*tb
[CTA_PROTOINFO_MAX
], *attr
= cda
[CTA_PROTOINFO
-1];
953 struct ip_conntrack_protocol
*proto
;
954 u_int16_t npt
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.protonum
;
957 nfattr_parse_nested(tb
, CTA_PROTOINFO_MAX
, attr
);
959 proto
= ip_conntrack_proto_find_get(npt
);
963 if (proto
->from_nfattr
)
964 err
= proto
->from_nfattr(tb
, ct
);
965 ip_conntrack_proto_put(proto
);
971 ctnetlink_change_conntrack(struct ip_conntrack
*ct
, struct nfattr
*cda
[])
975 DEBUGP("entered %s\n", __FUNCTION__
);
977 if (cda
[CTA_HELP
-1]) {
978 err
= ctnetlink_change_helper(ct
, cda
);
983 if (cda
[CTA_TIMEOUT
-1]) {
984 err
= ctnetlink_change_timeout(ct
, cda
);
989 if (cda
[CTA_STATUS
-1]) {
990 err
= ctnetlink_change_status(ct
, cda
);
995 if (cda
[CTA_PROTOINFO
-1]) {
996 err
= ctnetlink_change_protoinfo(ct
, cda
);
1001 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
1002 if (cda
[CTA_MARK
-1])
1003 ct
->mark
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_MARK
-1]));
1006 DEBUGP("all done\n");
1011 ctnetlink_create_conntrack(struct nfattr
*cda
[],
1012 struct ip_conntrack_tuple
*otuple
,
1013 struct ip_conntrack_tuple
*rtuple
)
1015 struct ip_conntrack
*ct
;
1018 DEBUGP("entered %s\n", __FUNCTION__
);
1020 ct
= ip_conntrack_alloc(otuple
, rtuple
);
1021 if (ct
== NULL
|| IS_ERR(ct
))
1024 if (!cda
[CTA_TIMEOUT
-1])
1026 ct
->timeout
.expires
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_TIMEOUT
-1]));
1028 ct
->timeout
.expires
= jiffies
+ ct
->timeout
.expires
* HZ
;
1029 ct
->status
|= IPS_CONFIRMED
;
1031 err
= ctnetlink_change_status(ct
, cda
);
1035 if (cda
[CTA_PROTOINFO
-1]) {
1036 err
= ctnetlink_change_protoinfo(ct
, cda
);
1041 ct
->helper
= ip_conntrack_helper_find_get(rtuple
);
1043 add_timer(&ct
->timeout
);
1044 ip_conntrack_hash_insert(ct
);
1047 ip_conntrack_helper_put(ct
->helper
);
1049 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
1050 if (cda
[CTA_MARK
-1])
1051 ct
->mark
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_MARK
-1]));
1054 DEBUGP("conntrack with id %u inserted\n", ct
->id
);
1058 ip_conntrack_free(ct
);
1063 ctnetlink_new_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
1064 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1066 struct ip_conntrack_tuple otuple
, rtuple
;
1067 struct ip_conntrack_tuple_hash
*h
= NULL
;
1070 DEBUGP("entered %s\n", __FUNCTION__
);
1072 if (nfattr_bad_size(cda
, CTA_MAX
, cta_min
))
1075 if (cda
[CTA_TUPLE_ORIG
-1]) {
1076 err
= ctnetlink_parse_tuple(cda
, &otuple
, CTA_TUPLE_ORIG
);
1081 if (cda
[CTA_TUPLE_REPLY
-1]) {
1082 err
= ctnetlink_parse_tuple(cda
, &rtuple
, CTA_TUPLE_REPLY
);
1087 write_lock_bh(&ip_conntrack_lock
);
1088 if (cda
[CTA_TUPLE_ORIG
-1])
1089 h
= __ip_conntrack_find(&otuple
, NULL
);
1090 else if (cda
[CTA_TUPLE_REPLY
-1])
1091 h
= __ip_conntrack_find(&rtuple
, NULL
);
1094 write_unlock_bh(&ip_conntrack_lock
);
1095 DEBUGP("no such conntrack, create new\n");
1097 if (nlh
->nlmsg_flags
& NLM_F_CREATE
)
1098 err
= ctnetlink_create_conntrack(cda
, &otuple
, &rtuple
);
1101 /* implicit 'else' */
1103 /* we only allow nat config for new conntracks */
1104 if (cda
[CTA_NAT
-1]) {
1109 /* We manipulate the conntrack inside the global conntrack table lock,
1110 * so there's no need to increase the refcount */
1111 DEBUGP("conntrack found\n");
1113 if (!(nlh
->nlmsg_flags
& NLM_F_EXCL
))
1114 err
= ctnetlink_change_conntrack(tuplehash_to_ctrack(h
), cda
);
1117 write_unlock_bh(&ip_conntrack_lock
);
1121 /***********************************************************************
1123 ***********************************************************************/
1126 ctnetlink_exp_dump_tuple(struct sk_buff
*skb
,
1127 const struct ip_conntrack_tuple
*tuple
,
1128 enum ctattr_expect type
)
1130 struct nfattr
*nest_parms
= NFA_NEST(skb
, type
);
1132 if (ctnetlink_dump_tuples(skb
, tuple
) < 0)
1133 goto nfattr_failure
;
1135 NFA_NEST_END(skb
, nest_parms
);
1144 ctnetlink_exp_dump_expect(struct sk_buff
*skb
,
1145 const struct ip_conntrack_expect
*exp
)
1147 struct ip_conntrack
*master
= exp
->master
;
1148 u_int32_t timeout
= htonl((exp
->timeout
.expires
- jiffies
) / HZ
);
1149 u_int32_t id
= htonl(exp
->id
);
1151 if (ctnetlink_exp_dump_tuple(skb
, &exp
->tuple
, CTA_EXPECT_TUPLE
) < 0)
1152 goto nfattr_failure
;
1153 if (ctnetlink_exp_dump_tuple(skb
, &exp
->mask
, CTA_EXPECT_MASK
) < 0)
1154 goto nfattr_failure
;
1155 if (ctnetlink_exp_dump_tuple(skb
,
1156 &master
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
,
1157 CTA_EXPECT_MASTER
) < 0)
1158 goto nfattr_failure
;
1160 NFA_PUT(skb
, CTA_EXPECT_TIMEOUT
, sizeof(timeout
), &timeout
);
1161 NFA_PUT(skb
, CTA_EXPECT_ID
, sizeof(u_int32_t
), &id
);
1170 ctnetlink_exp_fill_info(struct sk_buff
*skb
, u32 pid
, u32 seq
,
1173 const struct ip_conntrack_expect
*exp
)
1175 struct nlmsghdr
*nlh
;
1176 struct nfgenmsg
*nfmsg
;
1181 event
|= NFNL_SUBSYS_CTNETLINK_EXP
<< 8;
1182 nlh
= NLMSG_PUT(skb
, pid
, seq
, event
, sizeof(struct nfgenmsg
));
1183 nfmsg
= NLMSG_DATA(nlh
);
1185 nlh
->nlmsg_flags
= (nowait
&& pid
) ? NLM_F_MULTI
: 0;
1186 nfmsg
->nfgen_family
= AF_INET
;
1187 nfmsg
->version
= NFNETLINK_V0
;
1190 if (ctnetlink_exp_dump_expect(skb
, exp
) < 0)
1191 goto nfattr_failure
;
1193 nlh
->nlmsg_len
= skb
->tail
- b
;
1198 skb_trim(skb
, b
- skb
->data
);
1202 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1203 static int ctnetlink_expect_event(struct notifier_block
*this,
1204 unsigned long events
, void *ptr
)
1206 struct nlmsghdr
*nlh
;
1207 struct nfgenmsg
*nfmsg
;
1208 struct ip_conntrack_expect
*exp
= (struct ip_conntrack_expect
*)ptr
;
1209 struct sk_buff
*skb
;
1215 if (events
& IPEXP_NEW
) {
1216 type
= IPCTNL_MSG_EXP_NEW
;
1217 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
1221 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_ATOMIC
);
1227 type
|= NFNL_SUBSYS_CTNETLINK
<< 8;
1228 nlh
= NLMSG_PUT(skb
, 0, 0, type
, sizeof(struct nfgenmsg
));
1229 nfmsg
= NLMSG_DATA(nlh
);
1231 nlh
->nlmsg_flags
= flags
;
1232 nfmsg
->nfgen_family
= AF_INET
;
1233 nfmsg
->version
= NFNETLINK_V0
;
1236 if (ctnetlink_exp_dump_expect(skb
, exp
) < 0)
1237 goto nfattr_failure
;
1239 nlh
->nlmsg_len
= skb
->tail
- b
;
1240 proto
= exp
->tuple
.dst
.protonum
;
1241 nfnetlink_send(skb
, 0, NFNLGRP_CONNTRACK_EXP_NEW
, 0);
1252 ctnetlink_exp_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1254 struct ip_conntrack_expect
*exp
= NULL
;
1255 struct list_head
*i
;
1256 u_int32_t
*id
= (u_int32_t
*) &cb
->args
[0];
1258 DEBUGP("entered %s, last id=%llu\n", __FUNCTION__
, *id
);
1260 read_lock_bh(&ip_conntrack_lock
);
1261 list_for_each_prev(i
, &ip_conntrack_expect_list
) {
1262 exp
= (struct ip_conntrack_expect
*) i
;
1265 if (ctnetlink_exp_fill_info(skb
, NETLINK_CB(cb
->skb
).pid
,
1273 read_unlock_bh(&ip_conntrack_lock
);
1275 DEBUGP("leaving, last id=%llu\n", *id
);
1280 static const size_t cta_min_exp
[CTA_EXPECT_MAX
] = {
1281 [CTA_EXPECT_TIMEOUT
-1] = sizeof(u_int32_t
),
1282 [CTA_EXPECT_ID
-1] = sizeof(u_int32_t
)
1286 ctnetlink_get_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1287 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1289 struct ip_conntrack_tuple tuple
;
1290 struct ip_conntrack_expect
*exp
;
1291 struct sk_buff
*skb2
;
1294 DEBUGP("entered %s\n", __FUNCTION__
);
1296 if (nfattr_bad_size(cda
, CTA_EXPECT_MAX
, cta_min_exp
))
1299 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1300 struct nfgenmsg
*msg
= NLMSG_DATA(nlh
);
1303 if (msg
->nfgen_family
!= AF_INET
)
1304 return -EAFNOSUPPORT
;
1306 if ((*errp
= netlink_dump_start(ctnl
, skb
, nlh
,
1307 ctnetlink_exp_dump_table
,
1308 ctnetlink_done
)) != 0)
1310 rlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
1311 if (rlen
> skb
->len
)
1313 skb_pull(skb
, rlen
);
1317 if (cda
[CTA_EXPECT_MASTER
-1])
1318 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_MASTER
);
1325 exp
= ip_conntrack_expect_find(&tuple
);
1329 if (cda
[CTA_EXPECT_ID
-1]) {
1330 u_int32_t id
= *(u_int32_t
*)NFA_DATA(cda
[CTA_EXPECT_ID
-1]);
1331 if (exp
->id
!= ntohl(id
)) {
1332 ip_conntrack_expect_put(exp
);
1338 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1341 NETLINK_CB(skb2
).dst_pid
= NETLINK_CB(skb
).pid
;
1343 err
= ctnetlink_exp_fill_info(skb2
, NETLINK_CB(skb
).pid
,
1344 nlh
->nlmsg_seq
, IPCTNL_MSG_EXP_NEW
,
1349 ip_conntrack_expect_put(exp
);
1351 return netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).pid
, MSG_DONTWAIT
);
1356 ip_conntrack_expect_put(exp
);
1361 ctnetlink_del_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1362 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1364 struct ip_conntrack_expect
*exp
, *tmp
;
1365 struct ip_conntrack_tuple tuple
;
1366 struct ip_conntrack_helper
*h
;
1369 if (nfattr_bad_size(cda
, CTA_EXPECT_MAX
, cta_min_exp
))
1372 if (cda
[CTA_EXPECT_TUPLE
-1]) {
1373 /* delete a single expect by tuple */
1374 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
);
1378 /* bump usage count to 2 */
1379 exp
= ip_conntrack_expect_find(&tuple
);
1383 if (cda
[CTA_EXPECT_ID
-1]) {
1385 *(u_int32_t
*)NFA_DATA(cda
[CTA_EXPECT_ID
-1]);
1386 if (exp
->id
!= ntohl(id
)) {
1387 ip_conntrack_expect_put(exp
);
1392 /* after list removal, usage count == 1 */
1393 ip_conntrack_unexpect_related(exp
);
1394 /* have to put what we 'get' above.
1395 * after this line usage count == 0 */
1396 ip_conntrack_expect_put(exp
);
1397 } else if (cda
[CTA_EXPECT_HELP_NAME
-1]) {
1398 char *name
= NFA_DATA(cda
[CTA_EXPECT_HELP_NAME
-1]);
1400 /* delete all expectations for this helper */
1401 write_lock_bh(&ip_conntrack_lock
);
1402 h
= __ip_conntrack_helper_find_byname(name
);
1404 write_unlock_bh(&ip_conntrack_lock
);
1407 list_for_each_entry_safe(exp
, tmp
, &ip_conntrack_expect_list
,
1409 if (exp
->master
->helper
== h
1410 && del_timer(&exp
->timeout
)) {
1411 ip_ct_unlink_expect(exp
);
1412 ip_conntrack_expect_put(exp
);
1415 write_unlock_bh(&ip_conntrack_lock
);
1417 /* This basically means we have to flush everything*/
1418 write_lock_bh(&ip_conntrack_lock
);
1419 list_for_each_entry_safe(exp
, tmp
, &ip_conntrack_expect_list
,
1421 if (del_timer(&exp
->timeout
)) {
1422 ip_ct_unlink_expect(exp
);
1423 ip_conntrack_expect_put(exp
);
1426 write_unlock_bh(&ip_conntrack_lock
);
1432 ctnetlink_change_expect(struct ip_conntrack_expect
*x
, struct nfattr
*cda
[])
1438 ctnetlink_create_expect(struct nfattr
*cda
[])
1440 struct ip_conntrack_tuple tuple
, mask
, master_tuple
;
1441 struct ip_conntrack_tuple_hash
*h
= NULL
;
1442 struct ip_conntrack_expect
*exp
;
1443 struct ip_conntrack
*ct
;
1446 DEBUGP("entered %s\n", __FUNCTION__
);
1448 /* caller guarantees that those three CTA_EXPECT_* exist */
1449 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
);
1452 err
= ctnetlink_parse_tuple(cda
, &mask
, CTA_EXPECT_MASK
);
1455 err
= ctnetlink_parse_tuple(cda
, &master_tuple
, CTA_EXPECT_MASTER
);
1459 /* Look for master conntrack of this expectation */
1460 h
= ip_conntrack_find_get(&master_tuple
, NULL
);
1463 ct
= tuplehash_to_ctrack(h
);
1466 /* such conntrack hasn't got any helper, abort */
1471 exp
= ip_conntrack_expect_alloc(ct
);
1477 exp
->expectfn
= NULL
;
1480 memcpy(&exp
->tuple
, &tuple
, sizeof(struct ip_conntrack_tuple
));
1481 memcpy(&exp
->mask
, &mask
, sizeof(struct ip_conntrack_tuple
));
1483 err
= ip_conntrack_expect_related(exp
);
1484 ip_conntrack_expect_put(exp
);
1487 ip_conntrack_put(tuplehash_to_ctrack(h
));
1492 ctnetlink_new_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1493 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1495 struct ip_conntrack_tuple tuple
;
1496 struct ip_conntrack_expect
*exp
;
1499 DEBUGP("entered %s\n", __FUNCTION__
);
1501 if (nfattr_bad_size(cda
, CTA_EXPECT_MAX
, cta_min_exp
))
1504 if (!cda
[CTA_EXPECT_TUPLE
-1]
1505 || !cda
[CTA_EXPECT_MASK
-1]
1506 || !cda
[CTA_EXPECT_MASTER
-1])
1509 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
);
1513 write_lock_bh(&ip_conntrack_lock
);
1514 exp
= __ip_conntrack_expect_find(&tuple
);
1517 write_unlock_bh(&ip_conntrack_lock
);
1519 if (nlh
->nlmsg_flags
& NLM_F_CREATE
)
1520 err
= ctnetlink_create_expect(cda
);
1525 if (!(nlh
->nlmsg_flags
& NLM_F_EXCL
))
1526 err
= ctnetlink_change_expect(exp
, cda
);
1527 write_unlock_bh(&ip_conntrack_lock
);
1529 DEBUGP("leaving\n");
1534 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1535 static struct notifier_block ctnl_notifier
= {
1536 .notifier_call
= ctnetlink_conntrack_event
,
1539 static struct notifier_block ctnl_notifier_exp
= {
1540 .notifier_call
= ctnetlink_expect_event
,
1544 static struct nfnl_callback ctnl_cb
[IPCTNL_MSG_MAX
] = {
1545 [IPCTNL_MSG_CT_NEW
] = { .call
= ctnetlink_new_conntrack
,
1546 .attr_count
= CTA_MAX
,
1547 .cap_required
= CAP_NET_ADMIN
},
1548 [IPCTNL_MSG_CT_GET
] = { .call
= ctnetlink_get_conntrack
,
1549 .attr_count
= CTA_MAX
,
1550 .cap_required
= CAP_NET_ADMIN
},
1551 [IPCTNL_MSG_CT_DELETE
] = { .call
= ctnetlink_del_conntrack
,
1552 .attr_count
= CTA_MAX
,
1553 .cap_required
= CAP_NET_ADMIN
},
1554 [IPCTNL_MSG_CT_GET_CTRZERO
] = { .call
= ctnetlink_get_conntrack
,
1555 .attr_count
= CTA_MAX
,
1556 .cap_required
= CAP_NET_ADMIN
},
1559 static struct nfnl_callback ctnl_exp_cb
[IPCTNL_MSG_EXP_MAX
] = {
1560 [IPCTNL_MSG_EXP_GET
] = { .call
= ctnetlink_get_expect
,
1561 .attr_count
= CTA_EXPECT_MAX
,
1562 .cap_required
= CAP_NET_ADMIN
},
1563 [IPCTNL_MSG_EXP_NEW
] = { .call
= ctnetlink_new_expect
,
1564 .attr_count
= CTA_EXPECT_MAX
,
1565 .cap_required
= CAP_NET_ADMIN
},
1566 [IPCTNL_MSG_EXP_DELETE
] = { .call
= ctnetlink_del_expect
,
1567 .attr_count
= CTA_EXPECT_MAX
,
1568 .cap_required
= CAP_NET_ADMIN
},
1571 static struct nfnetlink_subsystem ctnl_subsys
= {
1572 .name
= "conntrack",
1573 .subsys_id
= NFNL_SUBSYS_CTNETLINK
,
1574 .cb_count
= IPCTNL_MSG_MAX
,
1578 static struct nfnetlink_subsystem ctnl_exp_subsys
= {
1579 .name
= "conntrack_expect",
1580 .subsys_id
= NFNL_SUBSYS_CTNETLINK_EXP
,
1581 .cb_count
= IPCTNL_MSG_EXP_MAX
,
1585 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK
);
1587 static int __init
ctnetlink_init(void)
1591 printk("ctnetlink v%s: registering with nfnetlink.\n", version
);
1592 ret
= nfnetlink_subsys_register(&ctnl_subsys
);
1594 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1598 ret
= nfnetlink_subsys_register(&ctnl_exp_subsys
);
1600 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1601 goto err_unreg_subsys
;
1604 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1605 ret
= ip_conntrack_register_notifier(&ctnl_notifier
);
1607 printk("ctnetlink_init: cannot register notifier.\n");
1608 goto err_unreg_exp_subsys
;
1611 ret
= ip_conntrack_expect_register_notifier(&ctnl_notifier_exp
);
1613 printk("ctnetlink_init: cannot expect register notifier.\n");
1614 goto err_unreg_notifier
;
1620 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1622 ip_conntrack_unregister_notifier(&ctnl_notifier
);
1623 err_unreg_exp_subsys
:
1624 nfnetlink_subsys_unregister(&ctnl_exp_subsys
);
1627 nfnetlink_subsys_unregister(&ctnl_subsys
);
1632 static void __exit
ctnetlink_exit(void)
1634 printk("ctnetlink: unregistering from nfnetlink.\n");
1636 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1637 ip_conntrack_unregister_notifier(&ctnl_notifier_exp
);
1638 ip_conntrack_unregister_notifier(&ctnl_notifier
);
1641 nfnetlink_subsys_unregister(&ctnl_exp_subsys
);
1642 nfnetlink_subsys_unregister(&ctnl_subsys
);
1646 module_init(ctnetlink_init
);
1647 module_exit(ctnetlink_exit
);