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 <linux/netfilter_ipv4/ip_nat_protocol.h>
44 #include <linux/netfilter/nfnetlink.h>
45 #include <linux/netfilter/nfnetlink_conntrack.h>
47 MODULE_LICENSE("GPL");
49 static char __initdata version
[] = "0.93";
52 ctnetlink_dump_tuples_proto(struct sk_buff
*skb
,
53 const struct nf_conntrack_tuple
*tuple
,
54 struct nf_conntrack_l4proto
*l4proto
)
57 struct nfattr
*nest_parms
= NFA_NEST(skb
, CTA_TUPLE_PROTO
);
59 NFA_PUT(skb
, CTA_PROTO_NUM
, sizeof(u_int8_t
), &tuple
->dst
.protonum
);
61 if (likely(l4proto
->tuple_to_nfattr
))
62 ret
= l4proto
->tuple_to_nfattr(skb
, tuple
);
64 NFA_NEST_END(skb
, nest_parms
);
73 ctnetlink_dump_tuples_ip(struct sk_buff
*skb
,
74 const struct nf_conntrack_tuple
*tuple
,
75 struct nf_conntrack_l3proto
*l3proto
)
78 struct nfattr
*nest_parms
= NFA_NEST(skb
, CTA_TUPLE_IP
);
80 if (likely(l3proto
->tuple_to_nfattr
))
81 ret
= l3proto
->tuple_to_nfattr(skb
, tuple
);
83 NFA_NEST_END(skb
, nest_parms
);
92 ctnetlink_dump_tuples(struct sk_buff
*skb
,
93 const struct nf_conntrack_tuple
*tuple
)
96 struct nf_conntrack_l3proto
*l3proto
;
97 struct nf_conntrack_l4proto
*l4proto
;
99 l3proto
= nf_ct_l3proto_find_get(tuple
->src
.l3num
);
100 ret
= ctnetlink_dump_tuples_ip(skb
, tuple
, l3proto
);
101 nf_ct_l3proto_put(l3proto
);
103 if (unlikely(ret
< 0))
106 l4proto
= nf_ct_l4proto_find_get(tuple
->src
.l3num
, tuple
->dst
.protonum
);
107 ret
= ctnetlink_dump_tuples_proto(skb
, tuple
, l4proto
);
108 nf_ct_l4proto_put(l4proto
);
114 ctnetlink_dump_status(struct sk_buff
*skb
, const struct nf_conn
*ct
)
116 __be32 status
= htonl((u_int32_t
) ct
->status
);
117 NFA_PUT(skb
, CTA_STATUS
, sizeof(status
), &status
);
125 ctnetlink_dump_timeout(struct sk_buff
*skb
, const struct nf_conn
*ct
)
127 long timeout_l
= ct
->timeout
.expires
- jiffies
;
133 timeout
= htonl(timeout_l
/ HZ
);
135 NFA_PUT(skb
, CTA_TIMEOUT
, sizeof(timeout
), &timeout
);
143 ctnetlink_dump_protoinfo(struct sk_buff
*skb
, const struct nf_conn
*ct
)
145 struct nf_conntrack_l4proto
*l4proto
= nf_ct_l4proto_find_get(ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
, ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.protonum
);
146 struct nfattr
*nest_proto
;
149 if (!l4proto
->to_nfattr
) {
150 nf_ct_l4proto_put(l4proto
);
154 nest_proto
= NFA_NEST(skb
, CTA_PROTOINFO
);
156 ret
= l4proto
->to_nfattr(skb
, nest_proto
, ct
);
158 nf_ct_l4proto_put(l4proto
);
160 NFA_NEST_END(skb
, nest_proto
);
165 nf_ct_l4proto_put(l4proto
);
170 ctnetlink_dump_helpinfo(struct sk_buff
*skb
, const struct nf_conn
*ct
)
172 struct nfattr
*nest_helper
;
173 const struct nf_conn_help
*help
= nfct_help(ct
);
175 if (!help
|| !help
->helper
)
178 nest_helper
= NFA_NEST(skb
, CTA_HELP
);
179 NFA_PUT(skb
, CTA_HELP_NAME
, strlen(help
->helper
->name
), help
->helper
->name
);
181 if (help
->helper
->to_nfattr
)
182 help
->helper
->to_nfattr(skb
, ct
);
184 NFA_NEST_END(skb
, nest_helper
);
192 #ifdef CONFIG_NF_CT_ACCT
194 ctnetlink_dump_counters(struct sk_buff
*skb
, const struct nf_conn
*ct
,
195 enum ip_conntrack_dir dir
)
197 enum ctattr_type type
= dir
? CTA_COUNTERS_REPLY
: CTA_COUNTERS_ORIG
;
198 struct nfattr
*nest_count
= NFA_NEST(skb
, type
);
201 tmp
= htonl(ct
->counters
[dir
].packets
);
202 NFA_PUT(skb
, CTA_COUNTERS32_PACKETS
, sizeof(u_int32_t
), &tmp
);
204 tmp
= htonl(ct
->counters
[dir
].bytes
);
205 NFA_PUT(skb
, CTA_COUNTERS32_BYTES
, sizeof(u_int32_t
), &tmp
);
207 NFA_NEST_END(skb
, nest_count
);
215 #define ctnetlink_dump_counters(a, b, c) (0)
218 #ifdef CONFIG_NF_CONNTRACK_MARK
220 ctnetlink_dump_mark(struct sk_buff
*skb
, const struct nf_conn
*ct
)
222 __be32 mark
= htonl(ct
->mark
);
224 NFA_PUT(skb
, CTA_MARK
, sizeof(u_int32_t
), &mark
);
231 #define ctnetlink_dump_mark(a, b) (0)
235 ctnetlink_dump_id(struct sk_buff
*skb
, const struct nf_conn
*ct
)
237 __be32 id
= htonl(ct
->id
);
238 NFA_PUT(skb
, CTA_ID
, sizeof(u_int32_t
), &id
);
246 ctnetlink_dump_use(struct sk_buff
*skb
, const struct nf_conn
*ct
)
248 __be32 use
= htonl(atomic_read(&ct
->ct_general
.use
));
250 NFA_PUT(skb
, CTA_USE
, sizeof(u_int32_t
), &use
);
257 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
260 ctnetlink_fill_info(struct sk_buff
*skb
, u32 pid
, u32 seq
,
261 int event
, int nowait
,
262 const struct nf_conn
*ct
)
264 struct nlmsghdr
*nlh
;
265 struct nfgenmsg
*nfmsg
;
266 struct nfattr
*nest_parms
;
271 event
|= NFNL_SUBSYS_CTNETLINK
<< 8;
272 nlh
= NLMSG_PUT(skb
, pid
, seq
, event
, sizeof(struct nfgenmsg
));
273 nfmsg
= NLMSG_DATA(nlh
);
275 nlh
->nlmsg_flags
= (nowait
&& pid
) ? NLM_F_MULTI
: 0;
276 nfmsg
->nfgen_family
=
277 ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
;
278 nfmsg
->version
= NFNETLINK_V0
;
281 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_ORIG
);
282 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
284 NFA_NEST_END(skb
, nest_parms
);
286 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_REPLY
);
287 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
289 NFA_NEST_END(skb
, nest_parms
);
291 if (ctnetlink_dump_status(skb
, ct
) < 0 ||
292 ctnetlink_dump_timeout(skb
, ct
) < 0 ||
293 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
294 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0 ||
295 ctnetlink_dump_protoinfo(skb
, ct
) < 0 ||
296 ctnetlink_dump_helpinfo(skb
, ct
) < 0 ||
297 ctnetlink_dump_mark(skb
, ct
) < 0 ||
298 ctnetlink_dump_id(skb
, ct
) < 0 ||
299 ctnetlink_dump_use(skb
, ct
) < 0)
302 nlh
->nlmsg_len
= skb
->tail
- b
;
307 skb_trim(skb
, b
- skb
->data
);
311 #ifdef CONFIG_NF_CONNTRACK_EVENTS
312 static int ctnetlink_conntrack_event(struct notifier_block
*this,
313 unsigned long events
, void *ptr
)
315 struct nlmsghdr
*nlh
;
316 struct nfgenmsg
*nfmsg
;
317 struct nfattr
*nest_parms
;
318 struct nf_conn
*ct
= (struct nf_conn
*)ptr
;
322 unsigned int flags
= 0, group
;
324 /* ignore our fake conntrack entry */
325 if (ct
== &nf_conntrack_untracked
)
328 if (events
& IPCT_DESTROY
) {
329 type
= IPCTNL_MSG_CT_DELETE
;
330 group
= NFNLGRP_CONNTRACK_DESTROY
;
331 } else if (events
& (IPCT_NEW
| IPCT_RELATED
)) {
332 type
= IPCTNL_MSG_CT_NEW
;
333 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
334 group
= NFNLGRP_CONNTRACK_NEW
;
335 } else if (events
& (IPCT_STATUS
| IPCT_PROTOINFO
)) {
336 type
= IPCTNL_MSG_CT_NEW
;
337 group
= NFNLGRP_CONNTRACK_UPDATE
;
341 if (!nfnetlink_has_listeners(group
))
344 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_ATOMIC
);
350 type
|= NFNL_SUBSYS_CTNETLINK
<< 8;
351 nlh
= NLMSG_PUT(skb
, 0, 0, type
, sizeof(struct nfgenmsg
));
352 nfmsg
= NLMSG_DATA(nlh
);
354 nlh
->nlmsg_flags
= flags
;
355 nfmsg
->nfgen_family
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
;
356 nfmsg
->version
= NFNETLINK_V0
;
359 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_ORIG
);
360 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
362 NFA_NEST_END(skb
, nest_parms
);
364 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_REPLY
);
365 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
367 NFA_NEST_END(skb
, nest_parms
);
369 if (events
& IPCT_DESTROY
) {
370 if (ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
371 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0)
374 if (ctnetlink_dump_status(skb
, ct
) < 0)
377 if (ctnetlink_dump_timeout(skb
, ct
) < 0)
380 if (events
& IPCT_PROTOINFO
381 && ctnetlink_dump_protoinfo(skb
, ct
) < 0)
384 if ((events
& IPCT_HELPER
|| nfct_help(ct
))
385 && ctnetlink_dump_helpinfo(skb
, ct
) < 0)
388 if ((events
& IPCT_MARK
|| ct
->mark
)
389 && ctnetlink_dump_mark(skb
, ct
) < 0)
392 if (events
& IPCT_COUNTER_FILLING
&&
393 (ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
394 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0))
398 nlh
->nlmsg_len
= skb
->tail
- b
;
399 nfnetlink_send(skb
, 0, group
, 0);
407 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
409 static int ctnetlink_done(struct netlink_callback
*cb
)
412 nf_ct_put((struct nf_conn
*)cb
->args
[1]);
416 #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
419 ctnetlink_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
421 struct nf_conn
*ct
, *last
;
422 struct nf_conntrack_tuple_hash
*h
;
424 struct nfgenmsg
*nfmsg
= NLMSG_DATA(cb
->nlh
);
425 u_int8_t l3proto
= nfmsg
->nfgen_family
;
427 read_lock_bh(&nf_conntrack_lock
);
428 last
= (struct nf_conn
*)cb
->args
[1];
429 for (; cb
->args
[0] < nf_conntrack_htable_size
; cb
->args
[0]++) {
431 list_for_each_prev(i
, &nf_conntrack_hash
[cb
->args
[0]]) {
432 h
= (struct nf_conntrack_tuple_hash
*) i
;
433 if (DIRECTION(h
) != IP_CT_DIR_ORIGINAL
)
435 ct
= nf_ct_tuplehash_to_ctrack(h
);
436 /* Dump entries of a given L3 protocol number.
437 * If it is not specified, ie. l3proto == 0,
438 * then dump everything. */
439 if (l3proto
&& L3PROTO(ct
) != l3proto
)
446 if (ctnetlink_fill_info(skb
, NETLINK_CB(cb
->skb
).pid
,
450 nf_conntrack_get(&ct
->ct_general
);
451 cb
->args
[1] = (unsigned long)ct
;
454 #ifdef CONFIG_NF_CT_ACCT
455 if (NFNL_MSG_TYPE(cb
->nlh
->nlmsg_type
) ==
456 IPCTNL_MSG_CT_GET_CTRZERO
)
457 memset(&ct
->counters
, 0, sizeof(ct
->counters
));
466 read_unlock_bh(&nf_conntrack_lock
);
474 ctnetlink_parse_tuple_ip(struct nfattr
*attr
, struct nf_conntrack_tuple
*tuple
)
476 struct nfattr
*tb
[CTA_IP_MAX
];
477 struct nf_conntrack_l3proto
*l3proto
;
480 nfattr_parse_nested(tb
, CTA_IP_MAX
, attr
);
482 l3proto
= nf_ct_l3proto_find_get(tuple
->src
.l3num
);
484 if (likely(l3proto
->nfattr_to_tuple
))
485 ret
= l3proto
->nfattr_to_tuple(tb
, tuple
);
487 nf_ct_l3proto_put(l3proto
);
492 static const size_t cta_min_proto
[CTA_PROTO_MAX
] = {
493 [CTA_PROTO_NUM
-1] = sizeof(u_int8_t
),
497 ctnetlink_parse_tuple_proto(struct nfattr
*attr
,
498 struct nf_conntrack_tuple
*tuple
)
500 struct nfattr
*tb
[CTA_PROTO_MAX
];
501 struct nf_conntrack_l4proto
*l4proto
;
504 nfattr_parse_nested(tb
, CTA_PROTO_MAX
, attr
);
506 if (nfattr_bad_size(tb
, CTA_PROTO_MAX
, cta_min_proto
))
509 if (!tb
[CTA_PROTO_NUM
-1])
511 tuple
->dst
.protonum
= *(u_int8_t
*)NFA_DATA(tb
[CTA_PROTO_NUM
-1]);
513 l4proto
= nf_ct_l4proto_find_get(tuple
->src
.l3num
, tuple
->dst
.protonum
);
515 if (likely(l4proto
->nfattr_to_tuple
))
516 ret
= l4proto
->nfattr_to_tuple(tb
, tuple
);
518 nf_ct_l4proto_put(l4proto
);
524 ctnetlink_parse_tuple(struct nfattr
*cda
[], struct nf_conntrack_tuple
*tuple
,
525 enum ctattr_tuple type
, u_int8_t l3num
)
527 struct nfattr
*tb
[CTA_TUPLE_MAX
];
530 memset(tuple
, 0, sizeof(*tuple
));
532 nfattr_parse_nested(tb
, CTA_TUPLE_MAX
, cda
[type
-1]);
534 if (!tb
[CTA_TUPLE_IP
-1])
537 tuple
->src
.l3num
= l3num
;
539 err
= ctnetlink_parse_tuple_ip(tb
[CTA_TUPLE_IP
-1], tuple
);
543 if (!tb
[CTA_TUPLE_PROTO
-1])
546 err
= ctnetlink_parse_tuple_proto(tb
[CTA_TUPLE_PROTO
-1], tuple
);
550 /* orig and expect tuples get DIR_ORIGINAL */
551 if (type
== CTA_TUPLE_REPLY
)
552 tuple
->dst
.dir
= IP_CT_DIR_REPLY
;
554 tuple
->dst
.dir
= IP_CT_DIR_ORIGINAL
;
559 #ifdef CONFIG_IP_NF_NAT_NEEDED
560 static const size_t cta_min_protonat
[CTA_PROTONAT_MAX
] = {
561 [CTA_PROTONAT_PORT_MIN
-1] = sizeof(u_int16_t
),
562 [CTA_PROTONAT_PORT_MAX
-1] = sizeof(u_int16_t
),
565 static int ctnetlink_parse_nat_proto(struct nfattr
*attr
,
566 const struct nf_conn
*ct
,
567 struct ip_nat_range
*range
)
569 struct nfattr
*tb
[CTA_PROTONAT_MAX
];
570 struct ip_nat_protocol
*npt
;
572 nfattr_parse_nested(tb
, CTA_PROTONAT_MAX
, attr
);
574 if (nfattr_bad_size(tb
, CTA_PROTONAT_MAX
, cta_min_protonat
))
577 npt
= ip_nat_proto_find_get(ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.protonum
);
579 if (!npt
->nfattr_to_range
) {
580 ip_nat_proto_put(npt
);
584 /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
585 if (npt
->nfattr_to_range(tb
, range
) > 0)
586 range
->flags
|= IP_NAT_RANGE_PROTO_SPECIFIED
;
588 ip_nat_proto_put(npt
);
593 static const size_t cta_min_nat
[CTA_NAT_MAX
] = {
594 [CTA_NAT_MINIP
-1] = sizeof(u_int32_t
),
595 [CTA_NAT_MAXIP
-1] = sizeof(u_int32_t
),
599 ctnetlink_parse_nat(struct nfattr
*nat
,
600 const struct nf_conn
*ct
, struct ip_nat_range
*range
)
602 struct nfattr
*tb
[CTA_NAT_MAX
];
605 memset(range
, 0, sizeof(*range
));
607 nfattr_parse_nested(tb
, CTA_NAT_MAX
, nat
);
609 if (nfattr_bad_size(tb
, CTA_NAT_MAX
, cta_min_nat
))
612 if (tb
[CTA_NAT_MINIP
-1])
613 range
->min_ip
= *(__be32
*)NFA_DATA(tb
[CTA_NAT_MINIP
-1]);
615 if (!tb
[CTA_NAT_MAXIP
-1])
616 range
->max_ip
= range
->min_ip
;
618 range
->max_ip
= *(__be32
*)NFA_DATA(tb
[CTA_NAT_MAXIP
-1]);
621 range
->flags
|= IP_NAT_RANGE_MAP_IPS
;
623 if (!tb
[CTA_NAT_PROTO
-1])
626 err
= ctnetlink_parse_nat_proto(tb
[CTA_NAT_PROTO
-1], ct
, range
);
635 ctnetlink_parse_help(struct nfattr
*attr
, char **helper_name
)
637 struct nfattr
*tb
[CTA_HELP_MAX
];
639 nfattr_parse_nested(tb
, CTA_HELP_MAX
, attr
);
641 if (!tb
[CTA_HELP_NAME
-1])
644 *helper_name
= NFA_DATA(tb
[CTA_HELP_NAME
-1]);
649 static const size_t cta_min
[CTA_MAX
] = {
650 [CTA_STATUS
-1] = sizeof(u_int32_t
),
651 [CTA_TIMEOUT
-1] = sizeof(u_int32_t
),
652 [CTA_MARK
-1] = sizeof(u_int32_t
),
653 [CTA_USE
-1] = sizeof(u_int32_t
),
654 [CTA_ID
-1] = sizeof(u_int32_t
)
658 ctnetlink_del_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
659 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
661 struct nf_conntrack_tuple_hash
*h
;
662 struct nf_conntrack_tuple tuple
;
664 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
665 u_int8_t u3
= nfmsg
->nfgen_family
;
668 if (nfattr_bad_size(cda
, CTA_MAX
, cta_min
))
671 if (cda
[CTA_TUPLE_ORIG
-1])
672 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
, u3
);
673 else if (cda
[CTA_TUPLE_REPLY
-1])
674 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
, u3
);
676 /* Flush the whole table */
677 nf_conntrack_flush();
684 h
= nf_conntrack_find_get(&tuple
, NULL
);
688 ct
= nf_ct_tuplehash_to_ctrack(h
);
691 u_int32_t id
= ntohl(*(__be32
*)NFA_DATA(cda
[CTA_ID
-1]));
697 if (del_timer(&ct
->timeout
))
698 ct
->timeout
.function((unsigned long)ct
);
706 ctnetlink_get_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
707 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
709 struct nf_conntrack_tuple_hash
*h
;
710 struct nf_conntrack_tuple tuple
;
712 struct sk_buff
*skb2
= NULL
;
713 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
714 u_int8_t u3
= nfmsg
->nfgen_family
;
717 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
720 #ifndef CONFIG_NF_CT_ACCT
721 if (NFNL_MSG_TYPE(nlh
->nlmsg_type
) == IPCTNL_MSG_CT_GET_CTRZERO
)
724 if ((*errp
= netlink_dump_start(ctnl
, skb
, nlh
,
725 ctnetlink_dump_table
,
726 ctnetlink_done
)) != 0)
729 rlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
736 if (nfattr_bad_size(cda
, CTA_MAX
, cta_min
))
739 if (cda
[CTA_TUPLE_ORIG
-1])
740 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
, u3
);
741 else if (cda
[CTA_TUPLE_REPLY
-1])
742 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
, u3
);
749 h
= nf_conntrack_find_get(&tuple
, NULL
);
753 ct
= nf_ct_tuplehash_to_ctrack(h
);
756 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
762 err
= ctnetlink_fill_info(skb2
, NETLINK_CB(skb
).pid
, nlh
->nlmsg_seq
,
763 IPCTNL_MSG_CT_NEW
, 1, ct
);
768 err
= netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).pid
, MSG_DONTWAIT
);
781 ctnetlink_change_status(struct nf_conn
*ct
, struct nfattr
*cda
[])
784 unsigned int status
= ntohl(*(__be32
*)NFA_DATA(cda
[CTA_STATUS
-1]));
785 d
= ct
->status
^ status
;
787 if (d
& (IPS_EXPECTED
|IPS_CONFIRMED
|IPS_DYING
))
791 if (d
& IPS_SEEN_REPLY
&& !(status
& IPS_SEEN_REPLY
))
792 /* SEEN_REPLY bit can only be set */
796 if (d
& IPS_ASSURED
&& !(status
& IPS_ASSURED
))
797 /* ASSURED bit can only be set */
800 if (cda
[CTA_NAT_SRC
-1] || cda
[CTA_NAT_DST
-1]) {
801 #ifndef CONFIG_IP_NF_NAT_NEEDED
804 struct ip_nat_range range
;
806 if (cda
[CTA_NAT_DST
-1]) {
807 if (ctnetlink_parse_nat(cda
[CTA_NAT_DST
-1], ct
,
810 if (ip_nat_initialized(ct
,
811 HOOK2MANIP(NF_IP_PRE_ROUTING
)))
813 ip_nat_setup_info(ct
, &range
, hooknum
);
815 if (cda
[CTA_NAT_SRC
-1]) {
816 if (ctnetlink_parse_nat(cda
[CTA_NAT_SRC
-1], ct
,
819 if (ip_nat_initialized(ct
,
820 HOOK2MANIP(NF_IP_POST_ROUTING
)))
822 ip_nat_setup_info(ct
, &range
, hooknum
);
827 /* Be careful here, modifying NAT bits can screw up things,
828 * so don't let users modify them directly if they don't pass
830 ct
->status
|= status
& ~(IPS_NAT_DONE_MASK
| IPS_NAT_MASK
);
836 ctnetlink_change_helper(struct nf_conn
*ct
, struct nfattr
*cda
[])
838 struct nf_conntrack_helper
*helper
;
839 struct nf_conn_help
*help
= nfct_help(ct
);
844 /* FIXME: we need to reallocate and rehash */
848 /* don't change helper of sibling connections */
852 err
= ctnetlink_parse_help(cda
[CTA_HELP
-1], &helpname
);
856 helper
= __nf_conntrack_helper_find_byname(helpname
);
858 if (!strcmp(helpname
, ""))
866 /* we had a helper before ... */
867 nf_ct_remove_expectations(ct
);
870 /* need to zero data of old helper */
871 memset(&help
->help
, 0, sizeof(help
->help
));
875 help
->helper
= helper
;
881 ctnetlink_change_timeout(struct nf_conn
*ct
, struct nfattr
*cda
[])
883 u_int32_t timeout
= ntohl(*(__be32
*)NFA_DATA(cda
[CTA_TIMEOUT
-1]));
885 if (!del_timer(&ct
->timeout
))
888 ct
->timeout
.expires
= jiffies
+ timeout
* HZ
;
889 add_timer(&ct
->timeout
);
895 ctnetlink_change_protoinfo(struct nf_conn
*ct
, struct nfattr
*cda
[])
897 struct nfattr
*tb
[CTA_PROTOINFO_MAX
], *attr
= cda
[CTA_PROTOINFO
-1];
898 struct nf_conntrack_l4proto
*l4proto
;
899 u_int16_t npt
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.protonum
;
900 u_int16_t l3num
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
;
903 nfattr_parse_nested(tb
, CTA_PROTOINFO_MAX
, attr
);
905 l4proto
= nf_ct_l4proto_find_get(l3num
, npt
);
907 if (l4proto
->from_nfattr
)
908 err
= l4proto
->from_nfattr(tb
, ct
);
909 nf_ct_l4proto_put(l4proto
);
915 ctnetlink_change_conntrack(struct nf_conn
*ct
, struct nfattr
*cda
[])
919 if (cda
[CTA_HELP
-1]) {
920 err
= ctnetlink_change_helper(ct
, cda
);
925 if (cda
[CTA_TIMEOUT
-1]) {
926 err
= ctnetlink_change_timeout(ct
, cda
);
931 if (cda
[CTA_STATUS
-1]) {
932 err
= ctnetlink_change_status(ct
, cda
);
937 if (cda
[CTA_PROTOINFO
-1]) {
938 err
= ctnetlink_change_protoinfo(ct
, cda
);
943 #if defined(CONFIG_NF_CONNTRACK_MARK)
945 ct
->mark
= ntohl(*(__be32
*)NFA_DATA(cda
[CTA_MARK
-1]));
952 ctnetlink_create_conntrack(struct nfattr
*cda
[],
953 struct nf_conntrack_tuple
*otuple
,
954 struct nf_conntrack_tuple
*rtuple
)
958 struct nf_conn_help
*help
;
960 ct
= nf_conntrack_alloc(otuple
, rtuple
);
961 if (ct
== NULL
|| IS_ERR(ct
))
964 if (!cda
[CTA_TIMEOUT
-1])
966 ct
->timeout
.expires
= ntohl(*(__be32
*)NFA_DATA(cda
[CTA_TIMEOUT
-1]));
968 ct
->timeout
.expires
= jiffies
+ ct
->timeout
.expires
* HZ
;
969 ct
->status
|= IPS_CONFIRMED
;
971 if (cda
[CTA_STATUS
-1]) {
972 err
= ctnetlink_change_status(ct
, cda
);
977 if (cda
[CTA_PROTOINFO
-1]) {
978 err
= ctnetlink_change_protoinfo(ct
, cda
);
983 #if defined(CONFIG_NF_CONNTRACK_MARK)
985 ct
->mark
= ntohl(*(__be32
*)NFA_DATA(cda
[CTA_MARK
-1]));
988 help
= nfct_help(ct
);
990 help
->helper
= nf_ct_helper_find_get(rtuple
);
992 add_timer(&ct
->timeout
);
993 nf_conntrack_hash_insert(ct
);
995 if (help
&& help
->helper
)
996 nf_ct_helper_put(help
->helper
);
1001 nf_conntrack_free(ct
);
1006 ctnetlink_new_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
1007 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1009 struct nf_conntrack_tuple otuple
, rtuple
;
1010 struct nf_conntrack_tuple_hash
*h
= NULL
;
1011 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1012 u_int8_t u3
= nfmsg
->nfgen_family
;
1015 if (nfattr_bad_size(cda
, CTA_MAX
, cta_min
))
1018 if (cda
[CTA_TUPLE_ORIG
-1]) {
1019 err
= ctnetlink_parse_tuple(cda
, &otuple
, CTA_TUPLE_ORIG
, u3
);
1024 if (cda
[CTA_TUPLE_REPLY
-1]) {
1025 err
= ctnetlink_parse_tuple(cda
, &rtuple
, CTA_TUPLE_REPLY
, u3
);
1030 write_lock_bh(&nf_conntrack_lock
);
1031 if (cda
[CTA_TUPLE_ORIG
-1])
1032 h
= __nf_conntrack_find(&otuple
, NULL
);
1033 else if (cda
[CTA_TUPLE_REPLY
-1])
1034 h
= __nf_conntrack_find(&rtuple
, NULL
);
1037 write_unlock_bh(&nf_conntrack_lock
);
1039 if (nlh
->nlmsg_flags
& NLM_F_CREATE
)
1040 err
= ctnetlink_create_conntrack(cda
, &otuple
, &rtuple
);
1043 /* implicit 'else' */
1045 /* we only allow nat config for new conntracks */
1046 if (cda
[CTA_NAT_SRC
-1] || cda
[CTA_NAT_DST
-1]) {
1051 /* We manipulate the conntrack inside the global conntrack table lock,
1052 * so there's no need to increase the refcount */
1054 if (!(nlh
->nlmsg_flags
& NLM_F_EXCL
))
1055 err
= ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h
), cda
);
1058 write_unlock_bh(&nf_conntrack_lock
);
1062 /***********************************************************************
1064 ***********************************************************************/
1067 ctnetlink_exp_dump_tuple(struct sk_buff
*skb
,
1068 const struct nf_conntrack_tuple
*tuple
,
1069 enum ctattr_expect type
)
1071 struct nfattr
*nest_parms
= NFA_NEST(skb
, type
);
1073 if (ctnetlink_dump_tuples(skb
, tuple
) < 0)
1074 goto nfattr_failure
;
1076 NFA_NEST_END(skb
, nest_parms
);
1085 ctnetlink_exp_dump_mask(struct sk_buff
*skb
,
1086 const struct nf_conntrack_tuple
*tuple
,
1087 const struct nf_conntrack_tuple
*mask
)
1090 struct nf_conntrack_l3proto
*l3proto
;
1091 struct nf_conntrack_l4proto
*l4proto
;
1092 struct nfattr
*nest_parms
= NFA_NEST(skb
, CTA_EXPECT_MASK
);
1094 l3proto
= nf_ct_l3proto_find_get(tuple
->src
.l3num
);
1095 ret
= ctnetlink_dump_tuples_ip(skb
, mask
, l3proto
);
1096 nf_ct_l3proto_put(l3proto
);
1098 if (unlikely(ret
< 0))
1099 goto nfattr_failure
;
1101 l4proto
= nf_ct_l4proto_find_get(tuple
->src
.l3num
, tuple
->dst
.protonum
);
1102 ret
= ctnetlink_dump_tuples_proto(skb
, mask
, l4proto
);
1103 nf_ct_l4proto_put(l4proto
);
1104 if (unlikely(ret
< 0))
1105 goto nfattr_failure
;
1107 NFA_NEST_END(skb
, nest_parms
);
1116 ctnetlink_exp_dump_expect(struct sk_buff
*skb
,
1117 const struct nf_conntrack_expect
*exp
)
1119 struct nf_conn
*master
= exp
->master
;
1120 __be32 timeout
= htonl((exp
->timeout
.expires
- jiffies
) / HZ
);
1121 __be32 id
= htonl(exp
->id
);
1123 if (ctnetlink_exp_dump_tuple(skb
, &exp
->tuple
, CTA_EXPECT_TUPLE
) < 0)
1124 goto nfattr_failure
;
1125 if (ctnetlink_exp_dump_mask(skb
, &exp
->tuple
, &exp
->mask
) < 0)
1126 goto nfattr_failure
;
1127 if (ctnetlink_exp_dump_tuple(skb
,
1128 &master
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
,
1129 CTA_EXPECT_MASTER
) < 0)
1130 goto nfattr_failure
;
1132 NFA_PUT(skb
, CTA_EXPECT_TIMEOUT
, sizeof(timeout
), &timeout
);
1133 NFA_PUT(skb
, CTA_EXPECT_ID
, sizeof(u_int32_t
), &id
);
1142 ctnetlink_exp_fill_info(struct sk_buff
*skb
, u32 pid
, u32 seq
,
1145 const struct nf_conntrack_expect
*exp
)
1147 struct nlmsghdr
*nlh
;
1148 struct nfgenmsg
*nfmsg
;
1153 event
|= NFNL_SUBSYS_CTNETLINK_EXP
<< 8;
1154 nlh
= NLMSG_PUT(skb
, pid
, seq
, event
, sizeof(struct nfgenmsg
));
1155 nfmsg
= NLMSG_DATA(nlh
);
1157 nlh
->nlmsg_flags
= (nowait
&& pid
) ? NLM_F_MULTI
: 0;
1158 nfmsg
->nfgen_family
= exp
->tuple
.src
.l3num
;
1159 nfmsg
->version
= NFNETLINK_V0
;
1162 if (ctnetlink_exp_dump_expect(skb
, exp
) < 0)
1163 goto nfattr_failure
;
1165 nlh
->nlmsg_len
= skb
->tail
- b
;
1170 skb_trim(skb
, b
- skb
->data
);
1174 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1175 static int ctnetlink_expect_event(struct notifier_block
*this,
1176 unsigned long events
, void *ptr
)
1178 struct nlmsghdr
*nlh
;
1179 struct nfgenmsg
*nfmsg
;
1180 struct nf_conntrack_expect
*exp
= (struct nf_conntrack_expect
*)ptr
;
1181 struct sk_buff
*skb
;
1186 if (events
& IPEXP_NEW
) {
1187 type
= IPCTNL_MSG_EXP_NEW
;
1188 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
1192 if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW
))
1195 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_ATOMIC
);
1201 type
|= NFNL_SUBSYS_CTNETLINK_EXP
<< 8;
1202 nlh
= NLMSG_PUT(skb
, 0, 0, type
, sizeof(struct nfgenmsg
));
1203 nfmsg
= NLMSG_DATA(nlh
);
1205 nlh
->nlmsg_flags
= flags
;
1206 nfmsg
->nfgen_family
= exp
->tuple
.src
.l3num
;
1207 nfmsg
->version
= NFNETLINK_V0
;
1210 if (ctnetlink_exp_dump_expect(skb
, exp
) < 0)
1211 goto nfattr_failure
;
1213 nlh
->nlmsg_len
= skb
->tail
- b
;
1214 nfnetlink_send(skb
, 0, NFNLGRP_CONNTRACK_EXP_NEW
, 0);
1225 ctnetlink_exp_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1227 struct nf_conntrack_expect
*exp
= NULL
;
1228 struct list_head
*i
;
1229 u_int32_t
*id
= (u_int32_t
*) &cb
->args
[0];
1230 struct nfgenmsg
*nfmsg
= NLMSG_DATA(cb
->nlh
);
1231 u_int8_t l3proto
= nfmsg
->nfgen_family
;
1233 read_lock_bh(&nf_conntrack_lock
);
1234 list_for_each_prev(i
, &nf_conntrack_expect_list
) {
1235 exp
= (struct nf_conntrack_expect
*) i
;
1236 if (l3proto
&& exp
->tuple
.src
.l3num
!= l3proto
)
1240 if (ctnetlink_exp_fill_info(skb
, NETLINK_CB(cb
->skb
).pid
,
1248 read_unlock_bh(&nf_conntrack_lock
);
1253 static const size_t cta_min_exp
[CTA_EXPECT_MAX
] = {
1254 [CTA_EXPECT_TIMEOUT
-1] = sizeof(u_int32_t
),
1255 [CTA_EXPECT_ID
-1] = sizeof(u_int32_t
)
1259 ctnetlink_get_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1260 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1262 struct nf_conntrack_tuple tuple
;
1263 struct nf_conntrack_expect
*exp
;
1264 struct sk_buff
*skb2
;
1265 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1266 u_int8_t u3
= nfmsg
->nfgen_family
;
1269 if (nfattr_bad_size(cda
, CTA_EXPECT_MAX
, cta_min_exp
))
1272 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1275 if ((*errp
= netlink_dump_start(ctnl
, skb
, nlh
,
1276 ctnetlink_exp_dump_table
,
1277 ctnetlink_done
)) != 0)
1279 rlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
1280 if (rlen
> skb
->len
)
1282 skb_pull(skb
, rlen
);
1286 if (cda
[CTA_EXPECT_MASTER
-1])
1287 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_MASTER
, u3
);
1294 exp
= nf_conntrack_expect_find_get(&tuple
);
1298 if (cda
[CTA_EXPECT_ID
-1]) {
1299 __be32 id
= *(__be32
*)NFA_DATA(cda
[CTA_EXPECT_ID
-1]);
1300 if (exp
->id
!= ntohl(id
)) {
1301 nf_conntrack_expect_put(exp
);
1307 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1311 err
= ctnetlink_exp_fill_info(skb2
, NETLINK_CB(skb
).pid
,
1312 nlh
->nlmsg_seq
, IPCTNL_MSG_EXP_NEW
,
1317 nf_conntrack_expect_put(exp
);
1319 return netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).pid
, MSG_DONTWAIT
);
1324 nf_conntrack_expect_put(exp
);
1329 ctnetlink_del_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1330 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1332 struct nf_conntrack_expect
*exp
, *tmp
;
1333 struct nf_conntrack_tuple tuple
;
1334 struct nf_conntrack_helper
*h
;
1335 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1336 u_int8_t u3
= nfmsg
->nfgen_family
;
1339 if (nfattr_bad_size(cda
, CTA_EXPECT_MAX
, cta_min_exp
))
1342 if (cda
[CTA_EXPECT_TUPLE
-1]) {
1343 /* delete a single expect by tuple */
1344 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
, u3
);
1348 /* bump usage count to 2 */
1349 exp
= nf_conntrack_expect_find_get(&tuple
);
1353 if (cda
[CTA_EXPECT_ID
-1]) {
1354 __be32 id
= *(__be32
*)NFA_DATA(cda
[CTA_EXPECT_ID
-1]);
1355 if (exp
->id
!= ntohl(id
)) {
1356 nf_conntrack_expect_put(exp
);
1361 /* after list removal, usage count == 1 */
1362 nf_conntrack_unexpect_related(exp
);
1363 /* have to put what we 'get' above.
1364 * after this line usage count == 0 */
1365 nf_conntrack_expect_put(exp
);
1366 } else if (cda
[CTA_EXPECT_HELP_NAME
-1]) {
1367 char *name
= NFA_DATA(cda
[CTA_EXPECT_HELP_NAME
-1]);
1369 /* delete all expectations for this helper */
1370 write_lock_bh(&nf_conntrack_lock
);
1371 h
= __nf_conntrack_helper_find_byname(name
);
1373 write_unlock_bh(&nf_conntrack_lock
);
1376 list_for_each_entry_safe(exp
, tmp
, &nf_conntrack_expect_list
,
1378 struct nf_conn_help
*m_help
= nfct_help(exp
->master
);
1379 if (m_help
->helper
== h
1380 && del_timer(&exp
->timeout
)) {
1381 nf_ct_unlink_expect(exp
);
1382 nf_conntrack_expect_put(exp
);
1385 write_unlock_bh(&nf_conntrack_lock
);
1387 /* This basically means we have to flush everything*/
1388 write_lock_bh(&nf_conntrack_lock
);
1389 list_for_each_entry_safe(exp
, tmp
, &nf_conntrack_expect_list
,
1391 if (del_timer(&exp
->timeout
)) {
1392 nf_ct_unlink_expect(exp
);
1393 nf_conntrack_expect_put(exp
);
1396 write_unlock_bh(&nf_conntrack_lock
);
1402 ctnetlink_change_expect(struct nf_conntrack_expect
*x
, struct nfattr
*cda
[])
1408 ctnetlink_create_expect(struct nfattr
*cda
[], u_int8_t u3
)
1410 struct nf_conntrack_tuple tuple
, mask
, master_tuple
;
1411 struct nf_conntrack_tuple_hash
*h
= NULL
;
1412 struct nf_conntrack_expect
*exp
;
1414 struct nf_conn_help
*help
;
1417 /* caller guarantees that those three CTA_EXPECT_* exist */
1418 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
, u3
);
1421 err
= ctnetlink_parse_tuple(cda
, &mask
, CTA_EXPECT_MASK
, u3
);
1424 err
= ctnetlink_parse_tuple(cda
, &master_tuple
, CTA_EXPECT_MASTER
, u3
);
1428 /* Look for master conntrack of this expectation */
1429 h
= nf_conntrack_find_get(&master_tuple
, NULL
);
1432 ct
= nf_ct_tuplehash_to_ctrack(h
);
1433 help
= nfct_help(ct
);
1435 if (!help
|| !help
->helper
) {
1436 /* such conntrack hasn't got any helper, abort */
1441 exp
= nf_conntrack_expect_alloc(ct
);
1447 exp
->expectfn
= NULL
;
1451 memcpy(&exp
->tuple
, &tuple
, sizeof(struct nf_conntrack_tuple
));
1452 memcpy(&exp
->mask
, &mask
, sizeof(struct nf_conntrack_tuple
));
1454 err
= nf_conntrack_expect_related(exp
);
1455 nf_conntrack_expect_put(exp
);
1458 nf_ct_put(nf_ct_tuplehash_to_ctrack(h
));
1463 ctnetlink_new_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1464 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1466 struct nf_conntrack_tuple tuple
;
1467 struct nf_conntrack_expect
*exp
;
1468 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1469 u_int8_t u3
= nfmsg
->nfgen_family
;
1472 if (nfattr_bad_size(cda
, CTA_EXPECT_MAX
, cta_min_exp
))
1475 if (!cda
[CTA_EXPECT_TUPLE
-1]
1476 || !cda
[CTA_EXPECT_MASK
-1]
1477 || !cda
[CTA_EXPECT_MASTER
-1])
1480 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
, u3
);
1484 write_lock_bh(&nf_conntrack_lock
);
1485 exp
= __nf_conntrack_expect_find(&tuple
);
1488 write_unlock_bh(&nf_conntrack_lock
);
1490 if (nlh
->nlmsg_flags
& NLM_F_CREATE
)
1491 err
= ctnetlink_create_expect(cda
, u3
);
1496 if (!(nlh
->nlmsg_flags
& NLM_F_EXCL
))
1497 err
= ctnetlink_change_expect(exp
, cda
);
1498 write_unlock_bh(&nf_conntrack_lock
);
1503 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1504 static struct notifier_block ctnl_notifier
= {
1505 .notifier_call
= ctnetlink_conntrack_event
,
1508 static struct notifier_block ctnl_notifier_exp
= {
1509 .notifier_call
= ctnetlink_expect_event
,
1513 static struct nfnl_callback ctnl_cb
[IPCTNL_MSG_MAX
] = {
1514 [IPCTNL_MSG_CT_NEW
] = { .call
= ctnetlink_new_conntrack
,
1515 .attr_count
= CTA_MAX
, },
1516 [IPCTNL_MSG_CT_GET
] = { .call
= ctnetlink_get_conntrack
,
1517 .attr_count
= CTA_MAX
, },
1518 [IPCTNL_MSG_CT_DELETE
] = { .call
= ctnetlink_del_conntrack
,
1519 .attr_count
= CTA_MAX
, },
1520 [IPCTNL_MSG_CT_GET_CTRZERO
] = { .call
= ctnetlink_get_conntrack
,
1521 .attr_count
= CTA_MAX
, },
1524 static struct nfnl_callback ctnl_exp_cb
[IPCTNL_MSG_EXP_MAX
] = {
1525 [IPCTNL_MSG_EXP_GET
] = { .call
= ctnetlink_get_expect
,
1526 .attr_count
= CTA_EXPECT_MAX
, },
1527 [IPCTNL_MSG_EXP_NEW
] = { .call
= ctnetlink_new_expect
,
1528 .attr_count
= CTA_EXPECT_MAX
, },
1529 [IPCTNL_MSG_EXP_DELETE
] = { .call
= ctnetlink_del_expect
,
1530 .attr_count
= CTA_EXPECT_MAX
, },
1533 static struct nfnetlink_subsystem ctnl_subsys
= {
1534 .name
= "conntrack",
1535 .subsys_id
= NFNL_SUBSYS_CTNETLINK
,
1536 .cb_count
= IPCTNL_MSG_MAX
,
1540 static struct nfnetlink_subsystem ctnl_exp_subsys
= {
1541 .name
= "conntrack_expect",
1542 .subsys_id
= NFNL_SUBSYS_CTNETLINK_EXP
,
1543 .cb_count
= IPCTNL_MSG_EXP_MAX
,
1547 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK
);
1548 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP
);
1550 static int __init
ctnetlink_init(void)
1554 printk("ctnetlink v%s: registering with nfnetlink.\n", version
);
1555 ret
= nfnetlink_subsys_register(&ctnl_subsys
);
1557 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1561 ret
= nfnetlink_subsys_register(&ctnl_exp_subsys
);
1563 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1564 goto err_unreg_subsys
;
1567 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1568 ret
= nf_conntrack_register_notifier(&ctnl_notifier
);
1570 printk("ctnetlink_init: cannot register notifier.\n");
1571 goto err_unreg_exp_subsys
;
1574 ret
= nf_conntrack_expect_register_notifier(&ctnl_notifier_exp
);
1576 printk("ctnetlink_init: cannot expect register notifier.\n");
1577 goto err_unreg_notifier
;
1583 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1585 nf_conntrack_unregister_notifier(&ctnl_notifier
);
1586 err_unreg_exp_subsys
:
1587 nfnetlink_subsys_unregister(&ctnl_exp_subsys
);
1590 nfnetlink_subsys_unregister(&ctnl_subsys
);
1595 static void __exit
ctnetlink_exit(void)
1597 printk("ctnetlink: unregistering from nfnetlink.\n");
1599 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1600 nf_conntrack_expect_unregister_notifier(&ctnl_notifier_exp
);
1601 nf_conntrack_unregister_notifier(&ctnl_notifier
);
1604 nfnetlink_subsys_unregister(&ctnl_exp_subsys
);
1605 nfnetlink_subsys_unregister(&ctnl_subsys
);
1609 module_init(ctnetlink_init
);
1610 module_exit(ctnetlink_exit
);