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 * 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.
20 * Derived from ip_conntrack_netlink.c: Port by Pablo Neira Ayuso (05/11/14)
23 #include <linux/init.h>
24 #include <linux/module.h>
25 #include <linux/kernel.h>
26 #include <linux/types.h>
27 #include <linux/timer.h>
28 #include <linux/skbuff.h>
29 #include <linux/errno.h>
30 #include <linux/netlink.h>
31 #include <linux/spinlock.h>
32 #include <linux/interrupt.h>
33 #include <linux/notifier.h>
35 #include <linux/netfilter.h>
36 #include <net/netfilter/nf_conntrack.h>
37 #include <net/netfilter/nf_conntrack_core.h>
38 #include <net/netfilter/nf_conntrack_expect.h>
39 #include <net/netfilter/nf_conntrack_helper.h>
40 #include <net/netfilter/nf_conntrack_l3proto.h>
41 #include <net/netfilter/nf_conntrack_l4proto.h>
42 #include <net/netfilter/nf_conntrack_tuple.h>
43 #ifdef CONFIG_NF_NAT_NEEDED
44 #include <net/netfilter/nf_nat_core.h>
45 #include <net/netfilter/nf_nat_protocol.h>
48 #include <linux/netfilter/nfnetlink.h>
49 #include <linux/netfilter/nfnetlink_conntrack.h>
51 MODULE_LICENSE("GPL");
53 static char __initdata version
[] = "0.93";
56 ctnetlink_dump_tuples_proto(struct sk_buff
*skb
,
57 const struct nf_conntrack_tuple
*tuple
,
58 struct nf_conntrack_l4proto
*l4proto
)
61 struct nfattr
*nest_parms
= NFA_NEST(skb
, CTA_TUPLE_PROTO
);
63 NFA_PUT(skb
, CTA_PROTO_NUM
, sizeof(u_int8_t
), &tuple
->dst
.protonum
);
65 if (likely(l4proto
->tuple_to_nfattr
))
66 ret
= l4proto
->tuple_to_nfattr(skb
, tuple
);
68 NFA_NEST_END(skb
, nest_parms
);
77 ctnetlink_dump_tuples_ip(struct sk_buff
*skb
,
78 const struct nf_conntrack_tuple
*tuple
,
79 struct nf_conntrack_l3proto
*l3proto
)
82 struct nfattr
*nest_parms
= NFA_NEST(skb
, CTA_TUPLE_IP
);
84 if (likely(l3proto
->tuple_to_nfattr
))
85 ret
= l3proto
->tuple_to_nfattr(skb
, tuple
);
87 NFA_NEST_END(skb
, nest_parms
);
96 ctnetlink_dump_tuples(struct sk_buff
*skb
,
97 const struct nf_conntrack_tuple
*tuple
)
100 struct nf_conntrack_l3proto
*l3proto
;
101 struct nf_conntrack_l4proto
*l4proto
;
103 l3proto
= nf_ct_l3proto_find_get(tuple
->src
.l3num
);
104 ret
= ctnetlink_dump_tuples_ip(skb
, tuple
, l3proto
);
105 nf_ct_l3proto_put(l3proto
);
107 if (unlikely(ret
< 0))
110 l4proto
= nf_ct_l4proto_find_get(tuple
->src
.l3num
, tuple
->dst
.protonum
);
111 ret
= ctnetlink_dump_tuples_proto(skb
, tuple
, l4proto
);
112 nf_ct_l4proto_put(l4proto
);
118 ctnetlink_dump_status(struct sk_buff
*skb
, const struct nf_conn
*ct
)
120 __be32 status
= htonl((u_int32_t
) ct
->status
);
121 NFA_PUT(skb
, CTA_STATUS
, sizeof(status
), &status
);
129 ctnetlink_dump_timeout(struct sk_buff
*skb
, const struct nf_conn
*ct
)
131 long timeout_l
= ct
->timeout
.expires
- jiffies
;
137 timeout
= htonl(timeout_l
/ HZ
);
139 NFA_PUT(skb
, CTA_TIMEOUT
, sizeof(timeout
), &timeout
);
147 ctnetlink_dump_protoinfo(struct sk_buff
*skb
, const struct nf_conn
*ct
)
149 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
);
150 struct nfattr
*nest_proto
;
153 if (!l4proto
->to_nfattr
) {
154 nf_ct_l4proto_put(l4proto
);
158 nest_proto
= NFA_NEST(skb
, CTA_PROTOINFO
);
160 ret
= l4proto
->to_nfattr(skb
, nest_proto
, ct
);
162 nf_ct_l4proto_put(l4proto
);
164 NFA_NEST_END(skb
, nest_proto
);
169 nf_ct_l4proto_put(l4proto
);
174 ctnetlink_dump_helpinfo(struct sk_buff
*skb
, const struct nf_conn
*ct
)
176 struct nfattr
*nest_helper
;
177 const struct nf_conn_help
*help
= nfct_help(ct
);
179 if (!help
|| !help
->helper
)
182 nest_helper
= NFA_NEST(skb
, CTA_HELP
);
183 NFA_PUT(skb
, CTA_HELP_NAME
, strlen(help
->helper
->name
), help
->helper
->name
);
185 if (help
->helper
->to_nfattr
)
186 help
->helper
->to_nfattr(skb
, ct
);
188 NFA_NEST_END(skb
, nest_helper
);
196 #ifdef CONFIG_NF_CT_ACCT
198 ctnetlink_dump_counters(struct sk_buff
*skb
, const struct nf_conn
*ct
,
199 enum ip_conntrack_dir dir
)
201 enum ctattr_type type
= dir
? CTA_COUNTERS_REPLY
: CTA_COUNTERS_ORIG
;
202 struct nfattr
*nest_count
= NFA_NEST(skb
, type
);
205 tmp
= htonl(ct
->counters
[dir
].packets
);
206 NFA_PUT(skb
, CTA_COUNTERS32_PACKETS
, sizeof(u_int32_t
), &tmp
);
208 tmp
= htonl(ct
->counters
[dir
].bytes
);
209 NFA_PUT(skb
, CTA_COUNTERS32_BYTES
, sizeof(u_int32_t
), &tmp
);
211 NFA_NEST_END(skb
, nest_count
);
219 #define ctnetlink_dump_counters(a, b, c) (0)
222 #ifdef CONFIG_NF_CONNTRACK_MARK
224 ctnetlink_dump_mark(struct sk_buff
*skb
, const struct nf_conn
*ct
)
226 __be32 mark
= htonl(ct
->mark
);
228 NFA_PUT(skb
, CTA_MARK
, sizeof(u_int32_t
), &mark
);
235 #define ctnetlink_dump_mark(a, b) (0)
239 ctnetlink_dump_id(struct sk_buff
*skb
, const struct nf_conn
*ct
)
241 __be32 id
= htonl(ct
->id
);
242 NFA_PUT(skb
, CTA_ID
, sizeof(u_int32_t
), &id
);
250 ctnetlink_dump_use(struct sk_buff
*skb
, const struct nf_conn
*ct
)
252 __be32 use
= htonl(atomic_read(&ct
->ct_general
.use
));
254 NFA_PUT(skb
, CTA_USE
, sizeof(u_int32_t
), &use
);
261 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
264 ctnetlink_fill_info(struct sk_buff
*skb
, u32 pid
, u32 seq
,
265 int event
, int nowait
,
266 const struct nf_conn
*ct
)
268 struct nlmsghdr
*nlh
;
269 struct nfgenmsg
*nfmsg
;
270 struct nfattr
*nest_parms
;
275 event
|= NFNL_SUBSYS_CTNETLINK
<< 8;
276 nlh
= NLMSG_PUT(skb
, pid
, seq
, event
, sizeof(struct nfgenmsg
));
277 nfmsg
= NLMSG_DATA(nlh
);
279 nlh
->nlmsg_flags
= (nowait
&& pid
) ? NLM_F_MULTI
: 0;
280 nfmsg
->nfgen_family
=
281 ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
;
282 nfmsg
->version
= NFNETLINK_V0
;
285 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_ORIG
);
286 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
288 NFA_NEST_END(skb
, nest_parms
);
290 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_REPLY
);
291 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
293 NFA_NEST_END(skb
, nest_parms
);
295 if (ctnetlink_dump_status(skb
, ct
) < 0 ||
296 ctnetlink_dump_timeout(skb
, ct
) < 0 ||
297 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
298 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0 ||
299 ctnetlink_dump_protoinfo(skb
, ct
) < 0 ||
300 ctnetlink_dump_helpinfo(skb
, ct
) < 0 ||
301 ctnetlink_dump_mark(skb
, ct
) < 0 ||
302 ctnetlink_dump_id(skb
, ct
) < 0 ||
303 ctnetlink_dump_use(skb
, ct
) < 0)
306 nlh
->nlmsg_len
= skb
->tail
- b
;
311 skb_trim(skb
, b
- skb
->data
);
315 #ifdef CONFIG_NF_CONNTRACK_EVENTS
316 static int ctnetlink_conntrack_event(struct notifier_block
*this,
317 unsigned long events
, void *ptr
)
319 struct nlmsghdr
*nlh
;
320 struct nfgenmsg
*nfmsg
;
321 struct nfattr
*nest_parms
;
322 struct nf_conn
*ct
= (struct nf_conn
*)ptr
;
326 unsigned int flags
= 0, group
;
328 /* ignore our fake conntrack entry */
329 if (ct
== &nf_conntrack_untracked
)
332 if (events
& IPCT_DESTROY
) {
333 type
= IPCTNL_MSG_CT_DELETE
;
334 group
= NFNLGRP_CONNTRACK_DESTROY
;
335 } else if (events
& (IPCT_NEW
| IPCT_RELATED
)) {
336 type
= IPCTNL_MSG_CT_NEW
;
337 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
338 group
= NFNLGRP_CONNTRACK_NEW
;
339 } else if (events
& (IPCT_STATUS
| IPCT_PROTOINFO
)) {
340 type
= IPCTNL_MSG_CT_NEW
;
341 group
= NFNLGRP_CONNTRACK_UPDATE
;
345 if (!nfnetlink_has_listeners(group
))
348 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_ATOMIC
);
354 type
|= NFNL_SUBSYS_CTNETLINK
<< 8;
355 nlh
= NLMSG_PUT(skb
, 0, 0, type
, sizeof(struct nfgenmsg
));
356 nfmsg
= NLMSG_DATA(nlh
);
358 nlh
->nlmsg_flags
= flags
;
359 nfmsg
->nfgen_family
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
;
360 nfmsg
->version
= NFNETLINK_V0
;
363 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_ORIG
);
364 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
366 NFA_NEST_END(skb
, nest_parms
);
368 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_REPLY
);
369 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
371 NFA_NEST_END(skb
, nest_parms
);
373 if (events
& IPCT_DESTROY
) {
374 if (ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
375 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0)
378 if (ctnetlink_dump_status(skb
, ct
) < 0)
381 if (ctnetlink_dump_timeout(skb
, ct
) < 0)
384 if (events
& IPCT_PROTOINFO
385 && ctnetlink_dump_protoinfo(skb
, ct
) < 0)
388 if ((events
& IPCT_HELPER
|| nfct_help(ct
))
389 && ctnetlink_dump_helpinfo(skb
, ct
) < 0)
392 #ifdef CONFIG_NF_CONNTRACK_MARK
393 if ((events
& IPCT_MARK
|| ct
->mark
)
394 && ctnetlink_dump_mark(skb
, ct
) < 0)
398 if (events
& IPCT_COUNTER_FILLING
&&
399 (ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
400 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0))
404 nlh
->nlmsg_len
= skb
->tail
- b
;
405 nfnetlink_send(skb
, 0, group
, 0);
413 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
415 static int ctnetlink_done(struct netlink_callback
*cb
)
418 nf_ct_put((struct nf_conn
*)cb
->args
[1]);
422 #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
425 ctnetlink_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
427 struct nf_conn
*ct
, *last
;
428 struct nf_conntrack_tuple_hash
*h
;
430 struct nfgenmsg
*nfmsg
= NLMSG_DATA(cb
->nlh
);
431 u_int8_t l3proto
= nfmsg
->nfgen_family
;
433 read_lock_bh(&nf_conntrack_lock
);
434 last
= (struct nf_conn
*)cb
->args
[1];
435 for (; cb
->args
[0] < nf_conntrack_htable_size
; cb
->args
[0]++) {
437 list_for_each_prev(i
, &nf_conntrack_hash
[cb
->args
[0]]) {
438 h
= (struct nf_conntrack_tuple_hash
*) i
;
439 if (NF_CT_DIRECTION(h
) != IP_CT_DIR_ORIGINAL
)
441 ct
= nf_ct_tuplehash_to_ctrack(h
);
442 /* Dump entries of a given L3 protocol number.
443 * If it is not specified, ie. l3proto == 0,
444 * then dump everything. */
445 if (l3proto
&& L3PROTO(ct
) != l3proto
)
452 if (ctnetlink_fill_info(skb
, NETLINK_CB(cb
->skb
).pid
,
456 nf_conntrack_get(&ct
->ct_general
);
457 cb
->args
[1] = (unsigned long)ct
;
460 #ifdef CONFIG_NF_CT_ACCT
461 if (NFNL_MSG_TYPE(cb
->nlh
->nlmsg_type
) ==
462 IPCTNL_MSG_CT_GET_CTRZERO
)
463 memset(&ct
->counters
, 0, sizeof(ct
->counters
));
472 read_unlock_bh(&nf_conntrack_lock
);
480 ctnetlink_parse_tuple_ip(struct nfattr
*attr
, struct nf_conntrack_tuple
*tuple
)
482 struct nfattr
*tb
[CTA_IP_MAX
];
483 struct nf_conntrack_l3proto
*l3proto
;
486 nfattr_parse_nested(tb
, CTA_IP_MAX
, attr
);
488 l3proto
= nf_ct_l3proto_find_get(tuple
->src
.l3num
);
490 if (likely(l3proto
->nfattr_to_tuple
))
491 ret
= l3proto
->nfattr_to_tuple(tb
, tuple
);
493 nf_ct_l3proto_put(l3proto
);
498 static const size_t cta_min_proto
[CTA_PROTO_MAX
] = {
499 [CTA_PROTO_NUM
-1] = sizeof(u_int8_t
),
503 ctnetlink_parse_tuple_proto(struct nfattr
*attr
,
504 struct nf_conntrack_tuple
*tuple
)
506 struct nfattr
*tb
[CTA_PROTO_MAX
];
507 struct nf_conntrack_l4proto
*l4proto
;
510 nfattr_parse_nested(tb
, CTA_PROTO_MAX
, attr
);
512 if (nfattr_bad_size(tb
, CTA_PROTO_MAX
, cta_min_proto
))
515 if (!tb
[CTA_PROTO_NUM
-1])
517 tuple
->dst
.protonum
= *(u_int8_t
*)NFA_DATA(tb
[CTA_PROTO_NUM
-1]);
519 l4proto
= nf_ct_l4proto_find_get(tuple
->src
.l3num
, tuple
->dst
.protonum
);
521 if (likely(l4proto
->nfattr_to_tuple
))
522 ret
= l4proto
->nfattr_to_tuple(tb
, tuple
);
524 nf_ct_l4proto_put(l4proto
);
530 ctnetlink_parse_tuple(struct nfattr
*cda
[], struct nf_conntrack_tuple
*tuple
,
531 enum ctattr_tuple type
, u_int8_t l3num
)
533 struct nfattr
*tb
[CTA_TUPLE_MAX
];
536 memset(tuple
, 0, sizeof(*tuple
));
538 nfattr_parse_nested(tb
, CTA_TUPLE_MAX
, cda
[type
-1]);
540 if (!tb
[CTA_TUPLE_IP
-1])
543 tuple
->src
.l3num
= l3num
;
545 err
= ctnetlink_parse_tuple_ip(tb
[CTA_TUPLE_IP
-1], tuple
);
549 if (!tb
[CTA_TUPLE_PROTO
-1])
552 err
= ctnetlink_parse_tuple_proto(tb
[CTA_TUPLE_PROTO
-1], tuple
);
556 /* orig and expect tuples get DIR_ORIGINAL */
557 if (type
== CTA_TUPLE_REPLY
)
558 tuple
->dst
.dir
= IP_CT_DIR_REPLY
;
560 tuple
->dst
.dir
= IP_CT_DIR_ORIGINAL
;
565 #ifdef CONFIG_NF_NAT_NEEDED
566 static const size_t cta_min_protonat
[CTA_PROTONAT_MAX
] = {
567 [CTA_PROTONAT_PORT_MIN
-1] = sizeof(u_int16_t
),
568 [CTA_PROTONAT_PORT_MAX
-1] = sizeof(u_int16_t
),
571 static int nfnetlink_parse_nat_proto(struct nfattr
*attr
,
572 const struct nf_conn
*ct
,
573 struct nf_nat_range
*range
)
575 struct nfattr
*tb
[CTA_PROTONAT_MAX
];
576 struct nf_nat_protocol
*npt
;
578 nfattr_parse_nested(tb
, CTA_PROTONAT_MAX
, attr
);
580 if (nfattr_bad_size(tb
, CTA_PROTONAT_MAX
, cta_min_protonat
))
583 npt
= nf_nat_proto_find_get(ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.protonum
);
585 if (!npt
->nfattr_to_range
) {
586 nf_nat_proto_put(npt
);
590 /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
591 if (npt
->nfattr_to_range(tb
, range
) > 0)
592 range
->flags
|= IP_NAT_RANGE_PROTO_SPECIFIED
;
594 nf_nat_proto_put(npt
);
599 static const size_t cta_min_nat
[CTA_NAT_MAX
] = {
600 [CTA_NAT_MINIP
-1] = sizeof(u_int32_t
),
601 [CTA_NAT_MAXIP
-1] = sizeof(u_int32_t
),
605 nfnetlink_parse_nat(struct nfattr
*nat
,
606 const struct nf_conn
*ct
, struct nf_nat_range
*range
)
608 struct nfattr
*tb
[CTA_NAT_MAX
];
611 memset(range
, 0, sizeof(*range
));
613 nfattr_parse_nested(tb
, CTA_NAT_MAX
, nat
);
615 if (nfattr_bad_size(tb
, CTA_NAT_MAX
, cta_min_nat
))
618 if (tb
[CTA_NAT_MINIP
-1])
619 range
->min_ip
= *(__be32
*)NFA_DATA(tb
[CTA_NAT_MINIP
-1]);
621 if (!tb
[CTA_NAT_MAXIP
-1])
622 range
->max_ip
= range
->min_ip
;
624 range
->max_ip
= *(__be32
*)NFA_DATA(tb
[CTA_NAT_MAXIP
-1]);
627 range
->flags
|= IP_NAT_RANGE_MAP_IPS
;
629 if (!tb
[CTA_NAT_PROTO
-1])
632 err
= nfnetlink_parse_nat_proto(tb
[CTA_NAT_PROTO
-1], ct
, range
);
641 ctnetlink_parse_help(struct nfattr
*attr
, char **helper_name
)
643 struct nfattr
*tb
[CTA_HELP_MAX
];
645 nfattr_parse_nested(tb
, CTA_HELP_MAX
, attr
);
647 if (!tb
[CTA_HELP_NAME
-1])
650 *helper_name
= NFA_DATA(tb
[CTA_HELP_NAME
-1]);
655 static const size_t cta_min
[CTA_MAX
] = {
656 [CTA_STATUS
-1] = sizeof(u_int32_t
),
657 [CTA_TIMEOUT
-1] = sizeof(u_int32_t
),
658 [CTA_MARK
-1] = sizeof(u_int32_t
),
659 [CTA_USE
-1] = sizeof(u_int32_t
),
660 [CTA_ID
-1] = sizeof(u_int32_t
)
664 ctnetlink_del_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
665 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
667 struct nf_conntrack_tuple_hash
*h
;
668 struct nf_conntrack_tuple tuple
;
670 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
671 u_int8_t u3
= nfmsg
->nfgen_family
;
674 if (nfattr_bad_size(cda
, CTA_MAX
, cta_min
))
677 if (cda
[CTA_TUPLE_ORIG
-1])
678 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
, u3
);
679 else if (cda
[CTA_TUPLE_REPLY
-1])
680 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
, u3
);
682 /* Flush the whole table */
683 nf_conntrack_flush();
690 h
= nf_conntrack_find_get(&tuple
, NULL
);
694 ct
= nf_ct_tuplehash_to_ctrack(h
);
697 u_int32_t id
= ntohl(*(__be32
*)NFA_DATA(cda
[CTA_ID
-1]));
703 if (del_timer(&ct
->timeout
))
704 ct
->timeout
.function((unsigned long)ct
);
712 ctnetlink_get_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
713 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
715 struct nf_conntrack_tuple_hash
*h
;
716 struct nf_conntrack_tuple tuple
;
718 struct sk_buff
*skb2
= NULL
;
719 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
720 u_int8_t u3
= nfmsg
->nfgen_family
;
723 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
726 #ifndef CONFIG_NF_CT_ACCT
727 if (NFNL_MSG_TYPE(nlh
->nlmsg_type
) == IPCTNL_MSG_CT_GET_CTRZERO
)
730 if ((*errp
= netlink_dump_start(ctnl
, skb
, nlh
,
731 ctnetlink_dump_table
,
732 ctnetlink_done
)) != 0)
735 rlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
742 if (nfattr_bad_size(cda
, CTA_MAX
, cta_min
))
745 if (cda
[CTA_TUPLE_ORIG
-1])
746 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
, u3
);
747 else if (cda
[CTA_TUPLE_REPLY
-1])
748 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
, u3
);
755 h
= nf_conntrack_find_get(&tuple
, NULL
);
759 ct
= nf_ct_tuplehash_to_ctrack(h
);
762 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
768 err
= ctnetlink_fill_info(skb2
, NETLINK_CB(skb
).pid
, nlh
->nlmsg_seq
,
769 IPCTNL_MSG_CT_NEW
, 1, ct
);
774 err
= netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).pid
, MSG_DONTWAIT
);
787 ctnetlink_change_status(struct nf_conn
*ct
, struct nfattr
*cda
[])
790 unsigned int status
= ntohl(*(__be32
*)NFA_DATA(cda
[CTA_STATUS
-1]));
791 d
= ct
->status
^ status
;
793 if (d
& (IPS_EXPECTED
|IPS_CONFIRMED
|IPS_DYING
))
797 if (d
& IPS_SEEN_REPLY
&& !(status
& IPS_SEEN_REPLY
))
798 /* SEEN_REPLY bit can only be set */
802 if (d
& IPS_ASSURED
&& !(status
& IPS_ASSURED
))
803 /* ASSURED bit can only be set */
806 if (cda
[CTA_NAT_SRC
-1] || cda
[CTA_NAT_DST
-1]) {
807 #ifndef CONFIG_NF_NAT_NEEDED
810 struct nf_nat_range range
;
812 if (cda
[CTA_NAT_DST
-1]) {
813 if (nfnetlink_parse_nat(cda
[CTA_NAT_DST
-1], ct
,
816 if (nf_nat_initialized(ct
,
817 HOOK2MANIP(NF_IP_PRE_ROUTING
)))
819 nf_nat_setup_info(ct
, &range
, NF_IP_PRE_ROUTING
);
821 if (cda
[CTA_NAT_SRC
-1]) {
822 if (nfnetlink_parse_nat(cda
[CTA_NAT_SRC
-1], ct
,
825 if (nf_nat_initialized(ct
,
826 HOOK2MANIP(NF_IP_POST_ROUTING
)))
828 nf_nat_setup_info(ct
, &range
, NF_IP_POST_ROUTING
);
833 /* Be careful here, modifying NAT bits can screw up things,
834 * so don't let users modify them directly if they don't pass
836 ct
->status
|= status
& ~(IPS_NAT_DONE_MASK
| IPS_NAT_MASK
);
842 ctnetlink_change_helper(struct nf_conn
*ct
, struct nfattr
*cda
[])
844 struct nf_conntrack_helper
*helper
;
845 struct nf_conn_help
*help
= nfct_help(ct
);
850 /* FIXME: we need to reallocate and rehash */
854 /* don't change helper of sibling connections */
858 err
= ctnetlink_parse_help(cda
[CTA_HELP
-1], &helpname
);
862 helper
= __nf_conntrack_helper_find_byname(helpname
);
864 if (!strcmp(helpname
, ""))
872 /* we had a helper before ... */
873 nf_ct_remove_expectations(ct
);
876 /* need to zero data of old helper */
877 memset(&help
->help
, 0, sizeof(help
->help
));
881 help
->helper
= helper
;
887 ctnetlink_change_timeout(struct nf_conn
*ct
, struct nfattr
*cda
[])
889 u_int32_t timeout
= ntohl(*(__be32
*)NFA_DATA(cda
[CTA_TIMEOUT
-1]));
891 if (!del_timer(&ct
->timeout
))
894 ct
->timeout
.expires
= jiffies
+ timeout
* HZ
;
895 add_timer(&ct
->timeout
);
901 ctnetlink_change_protoinfo(struct nf_conn
*ct
, struct nfattr
*cda
[])
903 struct nfattr
*tb
[CTA_PROTOINFO_MAX
], *attr
= cda
[CTA_PROTOINFO
-1];
904 struct nf_conntrack_l4proto
*l4proto
;
905 u_int16_t npt
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.protonum
;
906 u_int16_t l3num
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
;
909 nfattr_parse_nested(tb
, CTA_PROTOINFO_MAX
, attr
);
911 l4proto
= nf_ct_l4proto_find_get(l3num
, npt
);
913 if (l4proto
->from_nfattr
)
914 err
= l4proto
->from_nfattr(tb
, ct
);
915 nf_ct_l4proto_put(l4proto
);
921 ctnetlink_change_conntrack(struct nf_conn
*ct
, struct nfattr
*cda
[])
925 if (cda
[CTA_HELP
-1]) {
926 err
= ctnetlink_change_helper(ct
, cda
);
931 if (cda
[CTA_TIMEOUT
-1]) {
932 err
= ctnetlink_change_timeout(ct
, cda
);
937 if (cda
[CTA_STATUS
-1]) {
938 err
= ctnetlink_change_status(ct
, cda
);
943 if (cda
[CTA_PROTOINFO
-1]) {
944 err
= ctnetlink_change_protoinfo(ct
, cda
);
949 #if defined(CONFIG_NF_CONNTRACK_MARK)
951 ct
->mark
= ntohl(*(__be32
*)NFA_DATA(cda
[CTA_MARK
-1]));
958 ctnetlink_create_conntrack(struct nfattr
*cda
[],
959 struct nf_conntrack_tuple
*otuple
,
960 struct nf_conntrack_tuple
*rtuple
)
964 struct nf_conn_help
*help
;
966 ct
= nf_conntrack_alloc(otuple
, rtuple
);
967 if (ct
== NULL
|| IS_ERR(ct
))
970 if (!cda
[CTA_TIMEOUT
-1])
972 ct
->timeout
.expires
= ntohl(*(__be32
*)NFA_DATA(cda
[CTA_TIMEOUT
-1]));
974 ct
->timeout
.expires
= jiffies
+ ct
->timeout
.expires
* HZ
;
975 ct
->status
|= IPS_CONFIRMED
;
977 if (cda
[CTA_STATUS
-1]) {
978 err
= ctnetlink_change_status(ct
, cda
);
983 if (cda
[CTA_PROTOINFO
-1]) {
984 err
= ctnetlink_change_protoinfo(ct
, cda
);
989 #if defined(CONFIG_NF_CONNTRACK_MARK)
991 ct
->mark
= ntohl(*(__be32
*)NFA_DATA(cda
[CTA_MARK
-1]));
994 help
= nfct_help(ct
);
996 help
->helper
= nf_ct_helper_find_get(rtuple
);
998 add_timer(&ct
->timeout
);
999 nf_conntrack_hash_insert(ct
);
1001 if (help
&& help
->helper
)
1002 nf_ct_helper_put(help
->helper
);
1007 nf_conntrack_free(ct
);
1012 ctnetlink_new_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
1013 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1015 struct nf_conntrack_tuple otuple
, rtuple
;
1016 struct nf_conntrack_tuple_hash
*h
= NULL
;
1017 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1018 u_int8_t u3
= nfmsg
->nfgen_family
;
1021 if (nfattr_bad_size(cda
, CTA_MAX
, cta_min
))
1024 if (cda
[CTA_TUPLE_ORIG
-1]) {
1025 err
= ctnetlink_parse_tuple(cda
, &otuple
, CTA_TUPLE_ORIG
, u3
);
1030 if (cda
[CTA_TUPLE_REPLY
-1]) {
1031 err
= ctnetlink_parse_tuple(cda
, &rtuple
, CTA_TUPLE_REPLY
, u3
);
1036 write_lock_bh(&nf_conntrack_lock
);
1037 if (cda
[CTA_TUPLE_ORIG
-1])
1038 h
= __nf_conntrack_find(&otuple
, NULL
);
1039 else if (cda
[CTA_TUPLE_REPLY
-1])
1040 h
= __nf_conntrack_find(&rtuple
, NULL
);
1043 write_unlock_bh(&nf_conntrack_lock
);
1045 if (nlh
->nlmsg_flags
& NLM_F_CREATE
)
1046 err
= ctnetlink_create_conntrack(cda
, &otuple
, &rtuple
);
1049 /* implicit 'else' */
1051 /* we only allow nat config for new conntracks */
1052 if (cda
[CTA_NAT_SRC
-1] || cda
[CTA_NAT_DST
-1]) {
1057 /* We manipulate the conntrack inside the global conntrack table lock,
1058 * so there's no need to increase the refcount */
1060 if (!(nlh
->nlmsg_flags
& NLM_F_EXCL
))
1061 err
= ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h
), cda
);
1064 write_unlock_bh(&nf_conntrack_lock
);
1068 /***********************************************************************
1070 ***********************************************************************/
1073 ctnetlink_exp_dump_tuple(struct sk_buff
*skb
,
1074 const struct nf_conntrack_tuple
*tuple
,
1075 enum ctattr_expect type
)
1077 struct nfattr
*nest_parms
= NFA_NEST(skb
, type
);
1079 if (ctnetlink_dump_tuples(skb
, tuple
) < 0)
1080 goto nfattr_failure
;
1082 NFA_NEST_END(skb
, nest_parms
);
1091 ctnetlink_exp_dump_mask(struct sk_buff
*skb
,
1092 const struct nf_conntrack_tuple
*tuple
,
1093 const struct nf_conntrack_tuple
*mask
)
1096 struct nf_conntrack_l3proto
*l3proto
;
1097 struct nf_conntrack_l4proto
*l4proto
;
1098 struct nfattr
*nest_parms
= NFA_NEST(skb
, CTA_EXPECT_MASK
);
1100 l3proto
= nf_ct_l3proto_find_get(tuple
->src
.l3num
);
1101 ret
= ctnetlink_dump_tuples_ip(skb
, mask
, l3proto
);
1102 nf_ct_l3proto_put(l3proto
);
1104 if (unlikely(ret
< 0))
1105 goto nfattr_failure
;
1107 l4proto
= nf_ct_l4proto_find_get(tuple
->src
.l3num
, tuple
->dst
.protonum
);
1108 ret
= ctnetlink_dump_tuples_proto(skb
, mask
, l4proto
);
1109 nf_ct_l4proto_put(l4proto
);
1110 if (unlikely(ret
< 0))
1111 goto nfattr_failure
;
1113 NFA_NEST_END(skb
, nest_parms
);
1122 ctnetlink_exp_dump_expect(struct sk_buff
*skb
,
1123 const struct nf_conntrack_expect
*exp
)
1125 struct nf_conn
*master
= exp
->master
;
1126 __be32 timeout
= htonl((exp
->timeout
.expires
- jiffies
) / HZ
);
1127 __be32 id
= htonl(exp
->id
);
1129 if (ctnetlink_exp_dump_tuple(skb
, &exp
->tuple
, CTA_EXPECT_TUPLE
) < 0)
1130 goto nfattr_failure
;
1131 if (ctnetlink_exp_dump_mask(skb
, &exp
->tuple
, &exp
->mask
) < 0)
1132 goto nfattr_failure
;
1133 if (ctnetlink_exp_dump_tuple(skb
,
1134 &master
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
,
1135 CTA_EXPECT_MASTER
) < 0)
1136 goto nfattr_failure
;
1138 NFA_PUT(skb
, CTA_EXPECT_TIMEOUT
, sizeof(timeout
), &timeout
);
1139 NFA_PUT(skb
, CTA_EXPECT_ID
, sizeof(u_int32_t
), &id
);
1148 ctnetlink_exp_fill_info(struct sk_buff
*skb
, u32 pid
, u32 seq
,
1151 const struct nf_conntrack_expect
*exp
)
1153 struct nlmsghdr
*nlh
;
1154 struct nfgenmsg
*nfmsg
;
1159 event
|= NFNL_SUBSYS_CTNETLINK_EXP
<< 8;
1160 nlh
= NLMSG_PUT(skb
, pid
, seq
, event
, sizeof(struct nfgenmsg
));
1161 nfmsg
= NLMSG_DATA(nlh
);
1163 nlh
->nlmsg_flags
= (nowait
&& pid
) ? NLM_F_MULTI
: 0;
1164 nfmsg
->nfgen_family
= exp
->tuple
.src
.l3num
;
1165 nfmsg
->version
= NFNETLINK_V0
;
1168 if (ctnetlink_exp_dump_expect(skb
, exp
) < 0)
1169 goto nfattr_failure
;
1171 nlh
->nlmsg_len
= skb
->tail
- b
;
1176 skb_trim(skb
, b
- skb
->data
);
1180 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1181 static int ctnetlink_expect_event(struct notifier_block
*this,
1182 unsigned long events
, void *ptr
)
1184 struct nlmsghdr
*nlh
;
1185 struct nfgenmsg
*nfmsg
;
1186 struct nf_conntrack_expect
*exp
= (struct nf_conntrack_expect
*)ptr
;
1187 struct sk_buff
*skb
;
1192 if (events
& IPEXP_NEW
) {
1193 type
= IPCTNL_MSG_EXP_NEW
;
1194 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
1198 if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW
))
1201 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_ATOMIC
);
1207 type
|= NFNL_SUBSYS_CTNETLINK_EXP
<< 8;
1208 nlh
= NLMSG_PUT(skb
, 0, 0, type
, sizeof(struct nfgenmsg
));
1209 nfmsg
= NLMSG_DATA(nlh
);
1211 nlh
->nlmsg_flags
= flags
;
1212 nfmsg
->nfgen_family
= exp
->tuple
.src
.l3num
;
1213 nfmsg
->version
= NFNETLINK_V0
;
1216 if (ctnetlink_exp_dump_expect(skb
, exp
) < 0)
1217 goto nfattr_failure
;
1219 nlh
->nlmsg_len
= skb
->tail
- b
;
1220 nfnetlink_send(skb
, 0, NFNLGRP_CONNTRACK_EXP_NEW
, 0);
1231 ctnetlink_exp_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1233 struct nf_conntrack_expect
*exp
= NULL
;
1234 struct list_head
*i
;
1235 u_int32_t
*id
= (u_int32_t
*) &cb
->args
[0];
1236 struct nfgenmsg
*nfmsg
= NLMSG_DATA(cb
->nlh
);
1237 u_int8_t l3proto
= nfmsg
->nfgen_family
;
1239 read_lock_bh(&nf_conntrack_lock
);
1240 list_for_each_prev(i
, &nf_conntrack_expect_list
) {
1241 exp
= (struct nf_conntrack_expect
*) i
;
1242 if (l3proto
&& exp
->tuple
.src
.l3num
!= l3proto
)
1246 if (ctnetlink_exp_fill_info(skb
, NETLINK_CB(cb
->skb
).pid
,
1254 read_unlock_bh(&nf_conntrack_lock
);
1259 static const size_t cta_min_exp
[CTA_EXPECT_MAX
] = {
1260 [CTA_EXPECT_TIMEOUT
-1] = sizeof(u_int32_t
),
1261 [CTA_EXPECT_ID
-1] = sizeof(u_int32_t
)
1265 ctnetlink_get_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1266 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1268 struct nf_conntrack_tuple tuple
;
1269 struct nf_conntrack_expect
*exp
;
1270 struct sk_buff
*skb2
;
1271 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1272 u_int8_t u3
= nfmsg
->nfgen_family
;
1275 if (nfattr_bad_size(cda
, CTA_EXPECT_MAX
, cta_min_exp
))
1278 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1281 if ((*errp
= netlink_dump_start(ctnl
, skb
, nlh
,
1282 ctnetlink_exp_dump_table
,
1283 ctnetlink_done
)) != 0)
1285 rlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
1286 if (rlen
> skb
->len
)
1288 skb_pull(skb
, rlen
);
1292 if (cda
[CTA_EXPECT_MASTER
-1])
1293 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_MASTER
, u3
);
1300 exp
= nf_conntrack_expect_find_get(&tuple
);
1304 if (cda
[CTA_EXPECT_ID
-1]) {
1305 __be32 id
= *(__be32
*)NFA_DATA(cda
[CTA_EXPECT_ID
-1]);
1306 if (exp
->id
!= ntohl(id
)) {
1307 nf_conntrack_expect_put(exp
);
1313 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1317 err
= ctnetlink_exp_fill_info(skb2
, NETLINK_CB(skb
).pid
,
1318 nlh
->nlmsg_seq
, IPCTNL_MSG_EXP_NEW
,
1323 nf_conntrack_expect_put(exp
);
1325 return netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).pid
, MSG_DONTWAIT
);
1330 nf_conntrack_expect_put(exp
);
1335 ctnetlink_del_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1336 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1338 struct nf_conntrack_expect
*exp
, *tmp
;
1339 struct nf_conntrack_tuple tuple
;
1340 struct nf_conntrack_helper
*h
;
1341 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1342 u_int8_t u3
= nfmsg
->nfgen_family
;
1345 if (nfattr_bad_size(cda
, CTA_EXPECT_MAX
, cta_min_exp
))
1348 if (cda
[CTA_EXPECT_TUPLE
-1]) {
1349 /* delete a single expect by tuple */
1350 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
, u3
);
1354 /* bump usage count to 2 */
1355 exp
= nf_conntrack_expect_find_get(&tuple
);
1359 if (cda
[CTA_EXPECT_ID
-1]) {
1360 __be32 id
= *(__be32
*)NFA_DATA(cda
[CTA_EXPECT_ID
-1]);
1361 if (exp
->id
!= ntohl(id
)) {
1362 nf_conntrack_expect_put(exp
);
1367 /* after list removal, usage count == 1 */
1368 nf_conntrack_unexpect_related(exp
);
1369 /* have to put what we 'get' above.
1370 * after this line usage count == 0 */
1371 nf_conntrack_expect_put(exp
);
1372 } else if (cda
[CTA_EXPECT_HELP_NAME
-1]) {
1373 char *name
= NFA_DATA(cda
[CTA_EXPECT_HELP_NAME
-1]);
1375 /* delete all expectations for this helper */
1376 write_lock_bh(&nf_conntrack_lock
);
1377 h
= __nf_conntrack_helper_find_byname(name
);
1379 write_unlock_bh(&nf_conntrack_lock
);
1382 list_for_each_entry_safe(exp
, tmp
, &nf_conntrack_expect_list
,
1384 struct nf_conn_help
*m_help
= nfct_help(exp
->master
);
1385 if (m_help
->helper
== h
1386 && del_timer(&exp
->timeout
)) {
1387 nf_ct_unlink_expect(exp
);
1388 nf_conntrack_expect_put(exp
);
1391 write_unlock_bh(&nf_conntrack_lock
);
1393 /* This basically means we have to flush everything*/
1394 write_lock_bh(&nf_conntrack_lock
);
1395 list_for_each_entry_safe(exp
, tmp
, &nf_conntrack_expect_list
,
1397 if (del_timer(&exp
->timeout
)) {
1398 nf_ct_unlink_expect(exp
);
1399 nf_conntrack_expect_put(exp
);
1402 write_unlock_bh(&nf_conntrack_lock
);
1408 ctnetlink_change_expect(struct nf_conntrack_expect
*x
, struct nfattr
*cda
[])
1414 ctnetlink_create_expect(struct nfattr
*cda
[], u_int8_t u3
)
1416 struct nf_conntrack_tuple tuple
, mask
, master_tuple
;
1417 struct nf_conntrack_tuple_hash
*h
= NULL
;
1418 struct nf_conntrack_expect
*exp
;
1420 struct nf_conn_help
*help
;
1423 /* caller guarantees that those three CTA_EXPECT_* exist */
1424 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
, u3
);
1427 err
= ctnetlink_parse_tuple(cda
, &mask
, CTA_EXPECT_MASK
, u3
);
1430 err
= ctnetlink_parse_tuple(cda
, &master_tuple
, CTA_EXPECT_MASTER
, u3
);
1434 /* Look for master conntrack of this expectation */
1435 h
= nf_conntrack_find_get(&master_tuple
, NULL
);
1438 ct
= nf_ct_tuplehash_to_ctrack(h
);
1439 help
= nfct_help(ct
);
1441 if (!help
|| !help
->helper
) {
1442 /* such conntrack hasn't got any helper, abort */
1447 exp
= nf_conntrack_expect_alloc(ct
);
1453 exp
->expectfn
= NULL
;
1457 memcpy(&exp
->tuple
, &tuple
, sizeof(struct nf_conntrack_tuple
));
1458 memcpy(&exp
->mask
, &mask
, sizeof(struct nf_conntrack_tuple
));
1460 err
= nf_conntrack_expect_related(exp
);
1461 nf_conntrack_expect_put(exp
);
1464 nf_ct_put(nf_ct_tuplehash_to_ctrack(h
));
1469 ctnetlink_new_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1470 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1472 struct nf_conntrack_tuple tuple
;
1473 struct nf_conntrack_expect
*exp
;
1474 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1475 u_int8_t u3
= nfmsg
->nfgen_family
;
1478 if (nfattr_bad_size(cda
, CTA_EXPECT_MAX
, cta_min_exp
))
1481 if (!cda
[CTA_EXPECT_TUPLE
-1]
1482 || !cda
[CTA_EXPECT_MASK
-1]
1483 || !cda
[CTA_EXPECT_MASTER
-1])
1486 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
, u3
);
1490 write_lock_bh(&nf_conntrack_lock
);
1491 exp
= __nf_conntrack_expect_find(&tuple
);
1494 write_unlock_bh(&nf_conntrack_lock
);
1496 if (nlh
->nlmsg_flags
& NLM_F_CREATE
)
1497 err
= ctnetlink_create_expect(cda
, u3
);
1502 if (!(nlh
->nlmsg_flags
& NLM_F_EXCL
))
1503 err
= ctnetlink_change_expect(exp
, cda
);
1504 write_unlock_bh(&nf_conntrack_lock
);
1509 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1510 static struct notifier_block ctnl_notifier
= {
1511 .notifier_call
= ctnetlink_conntrack_event
,
1514 static struct notifier_block ctnl_notifier_exp
= {
1515 .notifier_call
= ctnetlink_expect_event
,
1519 static struct nfnl_callback ctnl_cb
[IPCTNL_MSG_MAX
] = {
1520 [IPCTNL_MSG_CT_NEW
] = { .call
= ctnetlink_new_conntrack
,
1521 .attr_count
= CTA_MAX
, },
1522 [IPCTNL_MSG_CT_GET
] = { .call
= ctnetlink_get_conntrack
,
1523 .attr_count
= CTA_MAX
, },
1524 [IPCTNL_MSG_CT_DELETE
] = { .call
= ctnetlink_del_conntrack
,
1525 .attr_count
= CTA_MAX
, },
1526 [IPCTNL_MSG_CT_GET_CTRZERO
] = { .call
= ctnetlink_get_conntrack
,
1527 .attr_count
= CTA_MAX
, },
1530 static struct nfnl_callback ctnl_exp_cb
[IPCTNL_MSG_EXP_MAX
] = {
1531 [IPCTNL_MSG_EXP_GET
] = { .call
= ctnetlink_get_expect
,
1532 .attr_count
= CTA_EXPECT_MAX
, },
1533 [IPCTNL_MSG_EXP_NEW
] = { .call
= ctnetlink_new_expect
,
1534 .attr_count
= CTA_EXPECT_MAX
, },
1535 [IPCTNL_MSG_EXP_DELETE
] = { .call
= ctnetlink_del_expect
,
1536 .attr_count
= CTA_EXPECT_MAX
, },
1539 static struct nfnetlink_subsystem ctnl_subsys
= {
1540 .name
= "conntrack",
1541 .subsys_id
= NFNL_SUBSYS_CTNETLINK
,
1542 .cb_count
= IPCTNL_MSG_MAX
,
1546 static struct nfnetlink_subsystem ctnl_exp_subsys
= {
1547 .name
= "conntrack_expect",
1548 .subsys_id
= NFNL_SUBSYS_CTNETLINK_EXP
,
1549 .cb_count
= IPCTNL_MSG_EXP_MAX
,
1553 MODULE_ALIAS("ip_conntrack_netlink");
1554 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK
);
1555 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP
);
1557 static int __init
ctnetlink_init(void)
1561 printk("ctnetlink v%s: registering with nfnetlink.\n", version
);
1562 ret
= nfnetlink_subsys_register(&ctnl_subsys
);
1564 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1568 ret
= nfnetlink_subsys_register(&ctnl_exp_subsys
);
1570 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1571 goto err_unreg_subsys
;
1574 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1575 ret
= nf_conntrack_register_notifier(&ctnl_notifier
);
1577 printk("ctnetlink_init: cannot register notifier.\n");
1578 goto err_unreg_exp_subsys
;
1581 ret
= nf_conntrack_expect_register_notifier(&ctnl_notifier_exp
);
1583 printk("ctnetlink_init: cannot expect register notifier.\n");
1584 goto err_unreg_notifier
;
1590 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1592 nf_conntrack_unregister_notifier(&ctnl_notifier
);
1593 err_unreg_exp_subsys
:
1594 nfnetlink_subsys_unregister(&ctnl_exp_subsys
);
1597 nfnetlink_subsys_unregister(&ctnl_subsys
);
1602 static void __exit
ctnetlink_exit(void)
1604 printk("ctnetlink: unregistering from nfnetlink.\n");
1606 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1607 nf_conntrack_expect_unregister_notifier(&ctnl_notifier_exp
);
1608 nf_conntrack_unregister_notifier(&ctnl_notifier
);
1611 nfnetlink_subsys_unregister(&ctnl_exp_subsys
);
1612 nfnetlink_subsys_unregister(&ctnl_subsys
);
1616 module_init(ctnetlink_init
);
1617 module_exit(ctnetlink_exit
);