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 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/notifier.h>
34 #include <linux/netfilter.h>
35 #include <net/netfilter/nf_conntrack.h>
36 #include <net/netfilter/nf_conntrack_core.h>
37 #include <net/netfilter/nf_conntrack_helper.h>
38 #include <net/netfilter/nf_conntrack_l3proto.h>
39 #include <net/netfilter/nf_conntrack_protocol.h>
40 #include <linux/netfilter_ipv4/ip_nat_protocol.h>
42 #include <linux/netfilter/nfnetlink.h>
43 #include <linux/netfilter/nfnetlink_conntrack.h>
45 MODULE_LICENSE("GPL");
47 static char __initdata version
[] = "0.93";
52 #define DEBUGP(format, args...)
57 ctnetlink_dump_tuples_proto(struct sk_buff
*skb
,
58 const struct nf_conntrack_tuple
*tuple
)
60 struct nf_conntrack_protocol
*proto
;
63 NFA_PUT(skb
, CTA_PROTO_NUM
, sizeof(u_int8_t
), &tuple
->dst
.protonum
);
65 /* If no protocol helper is found, this function will return the
66 * generic protocol helper, so proto won't *ever* be NULL */
67 proto
= nf_ct_proto_find_get(tuple
->src
.l3num
, tuple
->dst
.protonum
);
68 if (likely(proto
->tuple_to_nfattr
))
69 ret
= proto
->tuple_to_nfattr(skb
, tuple
);
71 nf_ct_proto_put(proto
);
80 ctnetlink_dump_tuples(struct sk_buff
*skb
,
81 const struct nf_conntrack_tuple
*tuple
)
83 struct nfattr
*nest_parms
;
84 struct nf_conntrack_l3proto
*l3proto
;
87 l3proto
= nf_ct_l3proto_find_get(tuple
->src
.l3num
);
89 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_IP
);
90 if (likely(l3proto
->tuple_to_nfattr
))
91 ret
= l3proto
->tuple_to_nfattr(skb
, tuple
);
92 NFA_NEST_END(skb
, nest_parms
);
94 nf_ct_l3proto_put(l3proto
);
96 if (unlikely(ret
< 0))
99 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_PROTO
);
100 ret
= ctnetlink_dump_tuples_proto(skb
, tuple
);
101 NFA_NEST_END(skb
, nest_parms
);
110 ctnetlink_dump_status(struct sk_buff
*skb
, const struct nf_conn
*ct
)
112 u_int32_t status
= htonl((u_int32_t
) ct
->status
);
113 NFA_PUT(skb
, CTA_STATUS
, sizeof(status
), &status
);
121 ctnetlink_dump_timeout(struct sk_buff
*skb
, const struct nf_conn
*ct
)
123 long timeout_l
= ct
->timeout
.expires
- jiffies
;
129 timeout
= htonl(timeout_l
/ HZ
);
131 NFA_PUT(skb
, CTA_TIMEOUT
, sizeof(timeout
), &timeout
);
139 ctnetlink_dump_protoinfo(struct sk_buff
*skb
, const struct nf_conn
*ct
)
141 struct nf_conntrack_protocol
*proto
= nf_ct_proto_find_get(ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
, ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.protonum
);
142 struct nfattr
*nest_proto
;
145 if (!proto
->to_nfattr
) {
146 nf_ct_proto_put(proto
);
150 nest_proto
= NFA_NEST(skb
, CTA_PROTOINFO
);
152 ret
= proto
->to_nfattr(skb
, nest_proto
, ct
);
154 nf_ct_proto_put(proto
);
156 NFA_NEST_END(skb
, nest_proto
);
165 ctnetlink_dump_helpinfo(struct sk_buff
*skb
, const struct nf_conn
*ct
)
167 struct nfattr
*nest_helper
;
168 const struct nf_conn_help
*help
= nfct_help(ct
);
170 if (!help
|| !help
->helper
)
173 nest_helper
= NFA_NEST(skb
, CTA_HELP
);
174 NFA_PUT(skb
, CTA_HELP_NAME
, strlen(help
->helper
->name
), help
->helper
->name
);
176 if (help
->helper
->to_nfattr
)
177 help
->helper
->to_nfattr(skb
, ct
);
179 NFA_NEST_END(skb
, nest_helper
);
187 #ifdef CONFIG_NF_CT_ACCT
189 ctnetlink_dump_counters(struct sk_buff
*skb
, const struct nf_conn
*ct
,
190 enum ip_conntrack_dir dir
)
192 enum ctattr_type type
= dir
? CTA_COUNTERS_REPLY
: CTA_COUNTERS_ORIG
;
193 struct nfattr
*nest_count
= NFA_NEST(skb
, type
);
196 tmp
= htonl(ct
->counters
[dir
].packets
);
197 NFA_PUT(skb
, CTA_COUNTERS32_PACKETS
, sizeof(u_int32_t
), &tmp
);
199 tmp
= htonl(ct
->counters
[dir
].bytes
);
200 NFA_PUT(skb
, CTA_COUNTERS32_BYTES
, sizeof(u_int32_t
), &tmp
);
202 NFA_NEST_END(skb
, nest_count
);
210 #define ctnetlink_dump_counters(a, b, c) (0)
213 #ifdef CONFIG_NF_CONNTRACK_MARK
215 ctnetlink_dump_mark(struct sk_buff
*skb
, const struct nf_conn
*ct
)
217 u_int32_t mark
= htonl(ct
->mark
);
219 NFA_PUT(skb
, CTA_MARK
, sizeof(u_int32_t
), &mark
);
226 #define ctnetlink_dump_mark(a, b) (0)
230 ctnetlink_dump_id(struct sk_buff
*skb
, const struct nf_conn
*ct
)
232 u_int32_t id
= htonl(ct
->id
);
233 NFA_PUT(skb
, CTA_ID
, sizeof(u_int32_t
), &id
);
241 ctnetlink_dump_use(struct sk_buff
*skb
, const struct nf_conn
*ct
)
243 u_int32_t use
= htonl(atomic_read(&ct
->ct_general
.use
));
245 NFA_PUT(skb
, CTA_USE
, sizeof(u_int32_t
), &use
);
252 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
255 ctnetlink_fill_info(struct sk_buff
*skb
, u32 pid
, u32 seq
,
256 int event
, int nowait
,
257 const struct nf_conn
*ct
)
259 struct nlmsghdr
*nlh
;
260 struct nfgenmsg
*nfmsg
;
261 struct nfattr
*nest_parms
;
266 event
|= NFNL_SUBSYS_CTNETLINK
<< 8;
267 nlh
= NLMSG_PUT(skb
, pid
, seq
, event
, sizeof(struct nfgenmsg
));
268 nfmsg
= NLMSG_DATA(nlh
);
270 nlh
->nlmsg_flags
= (nowait
&& pid
) ? NLM_F_MULTI
: 0;
271 nfmsg
->nfgen_family
=
272 ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
;
273 nfmsg
->version
= NFNETLINK_V0
;
276 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_ORIG
);
277 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
279 NFA_NEST_END(skb
, nest_parms
);
281 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_REPLY
);
282 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
284 NFA_NEST_END(skb
, nest_parms
);
286 if (ctnetlink_dump_status(skb
, ct
) < 0 ||
287 ctnetlink_dump_timeout(skb
, ct
) < 0 ||
288 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
289 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0 ||
290 ctnetlink_dump_protoinfo(skb
, ct
) < 0 ||
291 ctnetlink_dump_helpinfo(skb
, ct
) < 0 ||
292 ctnetlink_dump_mark(skb
, ct
) < 0 ||
293 ctnetlink_dump_id(skb
, ct
) < 0 ||
294 ctnetlink_dump_use(skb
, ct
) < 0)
297 nlh
->nlmsg_len
= skb
->tail
- b
;
302 skb_trim(skb
, b
- skb
->data
);
306 #ifdef CONFIG_NF_CONNTRACK_EVENTS
307 static int ctnetlink_conntrack_event(struct notifier_block
*this,
308 unsigned long events
, void *ptr
)
310 struct nlmsghdr
*nlh
;
311 struct nfgenmsg
*nfmsg
;
312 struct nfattr
*nest_parms
;
313 struct nf_conn
*ct
= (struct nf_conn
*)ptr
;
317 unsigned int flags
= 0, group
;
319 /* ignore our fake conntrack entry */
320 if (ct
== &nf_conntrack_untracked
)
323 if (events
& IPCT_DESTROY
) {
324 type
= IPCTNL_MSG_CT_DELETE
;
325 group
= NFNLGRP_CONNTRACK_DESTROY
;
326 } else if (events
& (IPCT_NEW
| IPCT_RELATED
)) {
327 type
= IPCTNL_MSG_CT_NEW
;
328 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
329 /* dump everything */
331 group
= NFNLGRP_CONNTRACK_NEW
;
332 } else if (events
& (IPCT_STATUS
|
337 type
= IPCTNL_MSG_CT_NEW
;
338 group
= NFNLGRP_CONNTRACK_UPDATE
;
342 /* FIXME: Check if there are any listeners before, don't hurt performance */
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 /* NAT stuff is now a status flag */
370 if ((events
& IPCT_STATUS
|| events
& IPCT_NATINFO
)
371 && ctnetlink_dump_status(skb
, ct
) < 0)
373 if (events
& IPCT_REFRESH
374 && ctnetlink_dump_timeout(skb
, ct
) < 0)
376 if (events
& IPCT_PROTOINFO
377 && ctnetlink_dump_protoinfo(skb
, ct
) < 0)
379 if (events
& IPCT_HELPINFO
380 && ctnetlink_dump_helpinfo(skb
, ct
) < 0)
383 if (ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
384 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0)
387 nlh
->nlmsg_len
= skb
->tail
- b
;
388 nfnetlink_send(skb
, 0, group
, 0);
396 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
398 static int ctnetlink_done(struct netlink_callback
*cb
)
400 DEBUGP("entered %s\n", __FUNCTION__
);
404 #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
407 ctnetlink_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
409 struct nf_conn
*ct
= NULL
;
410 struct nf_conntrack_tuple_hash
*h
;
412 u_int32_t
*id
= (u_int32_t
*) &cb
->args
[1];
413 struct nfgenmsg
*nfmsg
= NLMSG_DATA(cb
->nlh
);
414 u_int8_t l3proto
= nfmsg
->nfgen_family
;
416 DEBUGP("entered %s, last bucket=%lu id=%u\n", __FUNCTION__
,
419 read_lock_bh(&nf_conntrack_lock
);
420 for (; cb
->args
[0] < nf_conntrack_htable_size
; cb
->args
[0]++, *id
= 0) {
421 list_for_each_prev(i
, &nf_conntrack_hash
[cb
->args
[0]]) {
422 h
= (struct nf_conntrack_tuple_hash
*) i
;
423 if (DIRECTION(h
) != IP_CT_DIR_ORIGINAL
)
425 ct
= nf_ct_tuplehash_to_ctrack(h
);
426 /* Dump entries of a given L3 protocol number.
427 * If it is not specified, ie. l3proto == 0,
428 * then dump everything. */
429 if (l3proto
&& L3PROTO(ct
) != l3proto
)
433 if (ctnetlink_fill_info(skb
, NETLINK_CB(cb
->skb
).pid
,
442 read_unlock_bh(&nf_conntrack_lock
);
444 DEBUGP("leaving, last bucket=%lu id=%u\n", cb
->args
[0], *id
);
449 #ifdef CONFIG_NF_CT_ACCT
451 ctnetlink_dump_table_w(struct sk_buff
*skb
, struct netlink_callback
*cb
)
453 struct nf_conn
*ct
= NULL
;
454 struct nf_conntrack_tuple_hash
*h
;
456 u_int32_t
*id
= (u_int32_t
*) &cb
->args
[1];
457 struct nfgenmsg
*nfmsg
= NLMSG_DATA(cb
->nlh
);
458 u_int8_t l3proto
= nfmsg
->nfgen_family
;
460 DEBUGP("entered %s, last bucket=%u id=%u\n", __FUNCTION__
,
463 write_lock_bh(&nf_conntrack_lock
);
464 for (; cb
->args
[0] < nf_conntrack_htable_size
; cb
->args
[0]++, *id
= 0) {
465 list_for_each_prev(i
, &nf_conntrack_hash
[cb
->args
[0]]) {
466 h
= (struct nf_conntrack_tuple_hash
*) i
;
467 if (DIRECTION(h
) != IP_CT_DIR_ORIGINAL
)
469 ct
= nf_ct_tuplehash_to_ctrack(h
);
470 if (l3proto
&& L3PROTO(ct
) != l3proto
)
474 if (ctnetlink_fill_info(skb
, NETLINK_CB(cb
->skb
).pid
,
481 memset(&ct
->counters
, 0, sizeof(ct
->counters
));
485 write_unlock_bh(&nf_conntrack_lock
);
487 DEBUGP("leaving, last bucket=%lu id=%u\n", cb
->args
[0], *id
);
494 ctnetlink_parse_tuple_ip(struct nfattr
*attr
, struct nf_conntrack_tuple
*tuple
)
496 struct nfattr
*tb
[CTA_IP_MAX
];
497 struct nf_conntrack_l3proto
*l3proto
;
500 DEBUGP("entered %s\n", __FUNCTION__
);
502 nfattr_parse_nested(tb
, CTA_IP_MAX
, attr
);
504 l3proto
= nf_ct_l3proto_find_get(tuple
->src
.l3num
);
506 if (likely(l3proto
->nfattr_to_tuple
))
507 ret
= l3proto
->nfattr_to_tuple(tb
, tuple
);
509 nf_ct_l3proto_put(l3proto
);
516 static const size_t cta_min_proto
[CTA_PROTO_MAX
] = {
517 [CTA_PROTO_NUM
-1] = sizeof(u_int8_t
),
521 ctnetlink_parse_tuple_proto(struct nfattr
*attr
,
522 struct nf_conntrack_tuple
*tuple
)
524 struct nfattr
*tb
[CTA_PROTO_MAX
];
525 struct nf_conntrack_protocol
*proto
;
528 DEBUGP("entered %s\n", __FUNCTION__
);
530 nfattr_parse_nested(tb
, CTA_PROTO_MAX
, attr
);
532 if (nfattr_bad_size(tb
, CTA_PROTO_MAX
, cta_min_proto
))
535 if (!tb
[CTA_PROTO_NUM
-1])
537 tuple
->dst
.protonum
= *(u_int8_t
*)NFA_DATA(tb
[CTA_PROTO_NUM
-1]);
539 proto
= nf_ct_proto_find_get(tuple
->src
.l3num
, tuple
->dst
.protonum
);
541 if (likely(proto
->nfattr_to_tuple
))
542 ret
= proto
->nfattr_to_tuple(tb
, tuple
);
544 nf_ct_proto_put(proto
);
550 ctnetlink_parse_tuple(struct nfattr
*cda
[], struct nf_conntrack_tuple
*tuple
,
551 enum ctattr_tuple type
, u_int8_t l3num
)
553 struct nfattr
*tb
[CTA_TUPLE_MAX
];
556 DEBUGP("entered %s\n", __FUNCTION__
);
558 memset(tuple
, 0, sizeof(*tuple
));
560 nfattr_parse_nested(tb
, CTA_TUPLE_MAX
, cda
[type
-1]);
562 if (!tb
[CTA_TUPLE_IP
-1])
565 tuple
->src
.l3num
= l3num
;
567 err
= ctnetlink_parse_tuple_ip(tb
[CTA_TUPLE_IP
-1], tuple
);
571 if (!tb
[CTA_TUPLE_PROTO
-1])
574 err
= ctnetlink_parse_tuple_proto(tb
[CTA_TUPLE_PROTO
-1], tuple
);
578 /* orig and expect tuples get DIR_ORIGINAL */
579 if (type
== CTA_TUPLE_REPLY
)
580 tuple
->dst
.dir
= IP_CT_DIR_REPLY
;
582 tuple
->dst
.dir
= IP_CT_DIR_ORIGINAL
;
584 NF_CT_DUMP_TUPLE(tuple
);
591 #ifdef CONFIG_IP_NF_NAT_NEEDED
592 static const size_t cta_min_protonat
[CTA_PROTONAT_MAX
] = {
593 [CTA_PROTONAT_PORT_MIN
-1] = sizeof(u_int16_t
),
594 [CTA_PROTONAT_PORT_MAX
-1] = sizeof(u_int16_t
),
597 static int ctnetlink_parse_nat_proto(struct nfattr
*attr
,
598 const struct nf_conn
*ct
,
599 struct ip_nat_range
*range
)
601 struct nfattr
*tb
[CTA_PROTONAT_MAX
];
602 struct ip_nat_protocol
*npt
;
604 DEBUGP("entered %s\n", __FUNCTION__
);
606 nfattr_parse_nested(tb
, CTA_PROTONAT_MAX
, attr
);
608 if (nfattr_bad_size(tb
, CTA_PROTONAT_MAX
, cta_min_protonat
))
611 npt
= ip_nat_proto_find_get(ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.protonum
);
613 if (!npt
->nfattr_to_range
) {
614 ip_nat_proto_put(npt
);
618 /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
619 if (npt
->nfattr_to_range(tb
, range
) > 0)
620 range
->flags
|= IP_NAT_RANGE_PROTO_SPECIFIED
;
622 ip_nat_proto_put(npt
);
628 static const size_t cta_min_nat
[CTA_NAT_MAX
] = {
629 [CTA_NAT_MINIP
-1] = sizeof(u_int32_t
),
630 [CTA_NAT_MAXIP
-1] = sizeof(u_int32_t
),
634 ctnetlink_parse_nat(struct nfattr
*cda
[],
635 const struct nf_conn
*ct
, struct ip_nat_range
*range
)
637 struct nfattr
*tb
[CTA_NAT_MAX
];
640 DEBUGP("entered %s\n", __FUNCTION__
);
642 memset(range
, 0, sizeof(*range
));
644 nfattr_parse_nested(tb
, CTA_NAT_MAX
, cda
[CTA_NAT
-1]);
646 if (nfattr_bad_size(tb
, CTA_NAT_MAX
, cta_min_nat
))
649 if (tb
[CTA_NAT_MINIP
-1])
650 range
->min_ip
= *(u_int32_t
*)NFA_DATA(tb
[CTA_NAT_MINIP
-1]);
652 if (!tb
[CTA_NAT_MAXIP
-1])
653 range
->max_ip
= range
->min_ip
;
655 range
->max_ip
= *(u_int32_t
*)NFA_DATA(tb
[CTA_NAT_MAXIP
-1]);
658 range
->flags
|= IP_NAT_RANGE_MAP_IPS
;
660 if (!tb
[CTA_NAT_PROTO
-1])
663 err
= ctnetlink_parse_nat_proto(tb
[CTA_NAT_PROTO
-1], ct
, range
);
673 ctnetlink_parse_help(struct nfattr
*attr
, char **helper_name
)
675 struct nfattr
*tb
[CTA_HELP_MAX
];
677 DEBUGP("entered %s\n", __FUNCTION__
);
679 nfattr_parse_nested(tb
, CTA_HELP_MAX
, attr
);
681 if (!tb
[CTA_HELP_NAME
-1])
684 *helper_name
= NFA_DATA(tb
[CTA_HELP_NAME
-1]);
689 static const size_t cta_min
[CTA_MAX
] = {
690 [CTA_STATUS
-1] = sizeof(u_int32_t
),
691 [CTA_TIMEOUT
-1] = sizeof(u_int32_t
),
692 [CTA_MARK
-1] = sizeof(u_int32_t
),
693 [CTA_USE
-1] = sizeof(u_int32_t
),
694 [CTA_ID
-1] = sizeof(u_int32_t
)
698 ctnetlink_del_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
699 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
701 struct nf_conntrack_tuple_hash
*h
;
702 struct nf_conntrack_tuple tuple
;
704 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
705 u_int8_t u3
= nfmsg
->nfgen_family
;
708 DEBUGP("entered %s\n", __FUNCTION__
);
710 if (nfattr_bad_size(cda
, CTA_MAX
, cta_min
))
713 if (cda
[CTA_TUPLE_ORIG
-1])
714 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
, u3
);
715 else if (cda
[CTA_TUPLE_REPLY
-1])
716 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
, u3
);
718 /* Flush the whole table */
719 nf_conntrack_flush();
726 h
= nf_conntrack_find_get(&tuple
, NULL
);
728 DEBUGP("tuple not found in conntrack hash\n");
732 ct
= nf_ct_tuplehash_to_ctrack(h
);
735 u_int32_t id
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_ID
-1]));
741 if (del_timer(&ct
->timeout
))
742 ct
->timeout
.function((unsigned long)ct
);
751 ctnetlink_get_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
752 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
754 struct nf_conntrack_tuple_hash
*h
;
755 struct nf_conntrack_tuple tuple
;
757 struct sk_buff
*skb2
= NULL
;
758 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
759 u_int8_t u3
= nfmsg
->nfgen_family
;
762 DEBUGP("entered %s\n", __FUNCTION__
);
764 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
767 if (NFNL_MSG_TYPE(nlh
->nlmsg_type
) ==
768 IPCTNL_MSG_CT_GET_CTRZERO
) {
769 #ifdef CONFIG_NF_CT_ACCT
770 if ((*errp
= netlink_dump_start(ctnl
, skb
, nlh
,
771 ctnetlink_dump_table_w
,
772 ctnetlink_done
)) != 0)
778 if ((*errp
= netlink_dump_start(ctnl
, skb
, nlh
,
779 ctnetlink_dump_table
,
780 ctnetlink_done
)) != 0)
784 rlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
791 if (nfattr_bad_size(cda
, CTA_MAX
, cta_min
))
794 if (cda
[CTA_TUPLE_ORIG
-1])
795 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
, u3
);
796 else if (cda
[CTA_TUPLE_REPLY
-1])
797 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
, u3
);
804 h
= nf_conntrack_find_get(&tuple
, NULL
);
806 DEBUGP("tuple not found in conntrack hash");
809 DEBUGP("tuple found\n");
810 ct
= nf_ct_tuplehash_to_ctrack(h
);
813 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
818 NETLINK_CB(skb2
).dst_pid
= NETLINK_CB(skb
).pid
;
820 err
= ctnetlink_fill_info(skb2
, NETLINK_CB(skb
).pid
, nlh
->nlmsg_seq
,
821 IPCTNL_MSG_CT_NEW
, 1, ct
);
826 err
= netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).pid
, MSG_DONTWAIT
);
840 ctnetlink_change_status(struct nf_conn
*ct
, struct nfattr
*cda
[])
843 unsigned status
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_STATUS
-1]));
844 d
= ct
->status
^ status
;
846 if (d
& (IPS_EXPECTED
|IPS_CONFIRMED
|IPS_DYING
))
850 if (d
& IPS_SEEN_REPLY
&& !(status
& IPS_SEEN_REPLY
))
851 /* SEEN_REPLY bit can only be set */
855 if (d
& IPS_ASSURED
&& !(status
& IPS_ASSURED
))
856 /* ASSURED bit can only be set */
859 if (cda
[CTA_NAT
-1]) {
860 #ifndef CONFIG_IP_NF_NAT_NEEDED
863 unsigned int hooknum
;
864 struct ip_nat_range range
;
866 if (ctnetlink_parse_nat(cda
, ct
, &range
) < 0)
869 DEBUGP("NAT: %u.%u.%u.%u-%u.%u.%u.%u:%u-%u\n",
870 NIPQUAD(range
.min_ip
), NIPQUAD(range
.max_ip
),
871 htons(range
.min
.all
), htons(range
.max
.all
));
873 /* This is tricky but it works. ip_nat_setup_info needs the
874 * hook number as parameter, so let's do the correct
875 * conversion and run away */
876 if (status
& IPS_SRC_NAT_DONE
)
877 hooknum
= NF_IP_POST_ROUTING
; /* IP_NAT_MANIP_SRC */
878 else if (status
& IPS_DST_NAT_DONE
)
879 hooknum
= NF_IP_PRE_ROUTING
; /* IP_NAT_MANIP_DST */
881 return -EINVAL
; /* Missing NAT flags */
883 DEBUGP("NAT status: %lu\n",
884 status
& (IPS_NAT_MASK
| IPS_NAT_DONE_MASK
));
886 if (ip_nat_initialized(ct
, HOOK2MANIP(hooknum
)))
888 ip_nat_setup_info(ct
, &range
, hooknum
);
890 DEBUGP("NAT status after setup_info: %lu\n",
891 ct
->status
& (IPS_NAT_MASK
| IPS_NAT_DONE_MASK
));
895 /* Be careful here, modifying NAT bits can screw up things,
896 * so don't let users modify them directly if they don't pass
898 ct
->status
|= status
& ~(IPS_NAT_DONE_MASK
| IPS_NAT_MASK
);
904 ctnetlink_change_helper(struct nf_conn
*ct
, struct nfattr
*cda
[])
906 struct nf_conntrack_helper
*helper
;
907 struct nf_conn_help
*help
= nfct_help(ct
);
911 DEBUGP("entered %s\n", __FUNCTION__
);
914 /* FIXME: we need to reallocate and rehash */
918 /* don't change helper of sibling connections */
922 err
= ctnetlink_parse_help(cda
[CTA_HELP
-1], &helpname
);
926 helper
= __nf_conntrack_helper_find_byname(helpname
);
928 if (!strcmp(helpname
, ""))
936 /* we had a helper before ... */
937 nf_ct_remove_expectations(ct
);
940 /* need to zero data of old helper */
941 memset(&help
->help
, 0, sizeof(help
->help
));
945 help
->helper
= helper
;
951 ctnetlink_change_timeout(struct nf_conn
*ct
, struct nfattr
*cda
[])
953 u_int32_t timeout
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_TIMEOUT
-1]));
955 if (!del_timer(&ct
->timeout
))
958 ct
->timeout
.expires
= jiffies
+ timeout
* HZ
;
959 add_timer(&ct
->timeout
);
965 ctnetlink_change_protoinfo(struct nf_conn
*ct
, struct nfattr
*cda
[])
967 struct nfattr
*tb
[CTA_PROTOINFO_MAX
], *attr
= cda
[CTA_PROTOINFO
-1];
968 struct nf_conntrack_protocol
*proto
;
969 u_int16_t npt
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.protonum
;
970 u_int16_t l3num
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
;
973 nfattr_parse_nested(tb
, CTA_PROTOINFO_MAX
, attr
);
975 proto
= nf_ct_proto_find_get(l3num
, npt
);
977 if (proto
->from_nfattr
)
978 err
= proto
->from_nfattr(tb
, ct
);
979 nf_ct_proto_put(proto
);
985 ctnetlink_change_conntrack(struct nf_conn
*ct
, struct nfattr
*cda
[])
989 DEBUGP("entered %s\n", __FUNCTION__
);
991 if (cda
[CTA_HELP
-1]) {
992 err
= ctnetlink_change_helper(ct
, cda
);
997 if (cda
[CTA_TIMEOUT
-1]) {
998 err
= ctnetlink_change_timeout(ct
, cda
);
1003 if (cda
[CTA_STATUS
-1]) {
1004 err
= ctnetlink_change_status(ct
, cda
);
1009 if (cda
[CTA_PROTOINFO
-1]) {
1010 err
= ctnetlink_change_protoinfo(ct
, cda
);
1015 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
1016 if (cda
[CTA_MARK
-1])
1017 ct
->mark
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_MARK
-1]));
1020 DEBUGP("all done\n");
1025 ctnetlink_create_conntrack(struct nfattr
*cda
[],
1026 struct nf_conntrack_tuple
*otuple
,
1027 struct nf_conntrack_tuple
*rtuple
)
1032 DEBUGP("entered %s\n", __FUNCTION__
);
1034 ct
= nf_conntrack_alloc(otuple
, rtuple
);
1035 if (ct
== NULL
|| IS_ERR(ct
))
1038 if (!cda
[CTA_TIMEOUT
-1])
1040 ct
->timeout
.expires
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_TIMEOUT
-1]));
1042 ct
->timeout
.expires
= jiffies
+ ct
->timeout
.expires
* HZ
;
1043 ct
->status
|= IPS_CONFIRMED
;
1045 err
= ctnetlink_change_status(ct
, cda
);
1049 if (cda
[CTA_PROTOINFO
-1]) {
1050 err
= ctnetlink_change_protoinfo(ct
, cda
);
1055 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
1056 if (cda
[CTA_MARK
-1])
1057 ct
->mark
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_MARK
-1]));
1060 add_timer(&ct
->timeout
);
1061 nf_conntrack_hash_insert(ct
);
1063 DEBUGP("conntrack with id %u inserted\n", ct
->id
);
1067 nf_conntrack_free(ct
);
1072 ctnetlink_new_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
1073 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1075 struct nf_conntrack_tuple otuple
, rtuple
;
1076 struct nf_conntrack_tuple_hash
*h
= NULL
;
1077 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1078 u_int8_t u3
= nfmsg
->nfgen_family
;
1081 DEBUGP("entered %s\n", __FUNCTION__
);
1083 if (nfattr_bad_size(cda
, CTA_MAX
, cta_min
))
1086 if (cda
[CTA_TUPLE_ORIG
-1]) {
1087 err
= ctnetlink_parse_tuple(cda
, &otuple
, CTA_TUPLE_ORIG
, u3
);
1092 if (cda
[CTA_TUPLE_REPLY
-1]) {
1093 err
= ctnetlink_parse_tuple(cda
, &rtuple
, CTA_TUPLE_REPLY
, u3
);
1098 write_lock_bh(&nf_conntrack_lock
);
1099 if (cda
[CTA_TUPLE_ORIG
-1])
1100 h
= __nf_conntrack_find(&otuple
, NULL
);
1101 else if (cda
[CTA_TUPLE_REPLY
-1])
1102 h
= __nf_conntrack_find(&rtuple
, NULL
);
1105 write_unlock_bh(&nf_conntrack_lock
);
1106 DEBUGP("no such conntrack, create new\n");
1108 if (nlh
->nlmsg_flags
& NLM_F_CREATE
)
1109 err
= ctnetlink_create_conntrack(cda
, &otuple
, &rtuple
);
1112 /* implicit 'else' */
1114 /* we only allow nat config for new conntracks */
1115 if (cda
[CTA_NAT
-1]) {
1120 /* We manipulate the conntrack inside the global conntrack table lock,
1121 * so there's no need to increase the refcount */
1122 DEBUGP("conntrack found\n");
1124 if (!(nlh
->nlmsg_flags
& NLM_F_EXCL
))
1125 err
= ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h
), cda
);
1128 write_unlock_bh(&nf_conntrack_lock
);
1132 /***********************************************************************
1134 ***********************************************************************/
1137 ctnetlink_exp_dump_tuple(struct sk_buff
*skb
,
1138 const struct nf_conntrack_tuple
*tuple
,
1139 enum ctattr_expect type
)
1141 struct nfattr
*nest_parms
= NFA_NEST(skb
, type
);
1143 if (ctnetlink_dump_tuples(skb
, tuple
) < 0)
1144 goto nfattr_failure
;
1146 NFA_NEST_END(skb
, nest_parms
);
1155 ctnetlink_exp_dump_expect(struct sk_buff
*skb
,
1156 const struct nf_conntrack_expect
*exp
)
1158 struct nf_conn
*master
= exp
->master
;
1159 u_int32_t timeout
= htonl((exp
->timeout
.expires
- jiffies
) / HZ
);
1160 u_int32_t id
= htonl(exp
->id
);
1162 if (ctnetlink_exp_dump_tuple(skb
, &exp
->tuple
, CTA_EXPECT_TUPLE
) < 0)
1163 goto nfattr_failure
;
1164 if (ctnetlink_exp_dump_tuple(skb
, &exp
->mask
, CTA_EXPECT_MASK
) < 0)
1165 goto nfattr_failure
;
1166 if (ctnetlink_exp_dump_tuple(skb
,
1167 &master
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
,
1168 CTA_EXPECT_MASTER
) < 0)
1169 goto nfattr_failure
;
1171 NFA_PUT(skb
, CTA_EXPECT_TIMEOUT
, sizeof(timeout
), &timeout
);
1172 NFA_PUT(skb
, CTA_EXPECT_ID
, sizeof(u_int32_t
), &id
);
1181 ctnetlink_exp_fill_info(struct sk_buff
*skb
, u32 pid
, u32 seq
,
1184 const struct nf_conntrack_expect
*exp
)
1186 struct nlmsghdr
*nlh
;
1187 struct nfgenmsg
*nfmsg
;
1192 event
|= NFNL_SUBSYS_CTNETLINK_EXP
<< 8;
1193 nlh
= NLMSG_PUT(skb
, pid
, seq
, event
, sizeof(struct nfgenmsg
));
1194 nfmsg
= NLMSG_DATA(nlh
);
1196 nlh
->nlmsg_flags
= (nowait
&& pid
) ? NLM_F_MULTI
: 0;
1197 nfmsg
->nfgen_family
= exp
->tuple
.src
.l3num
;
1198 nfmsg
->version
= NFNETLINK_V0
;
1201 if (ctnetlink_exp_dump_expect(skb
, exp
) < 0)
1202 goto nfattr_failure
;
1204 nlh
->nlmsg_len
= skb
->tail
- b
;
1209 skb_trim(skb
, b
- skb
->data
);
1213 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1214 static int ctnetlink_expect_event(struct notifier_block
*this,
1215 unsigned long events
, void *ptr
)
1217 struct nlmsghdr
*nlh
;
1218 struct nfgenmsg
*nfmsg
;
1219 struct nf_conntrack_expect
*exp
= (struct nf_conntrack_expect
*)ptr
;
1220 struct sk_buff
*skb
;
1225 if (events
& IPEXP_NEW
) {
1226 type
= IPCTNL_MSG_EXP_NEW
;
1227 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
1231 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_ATOMIC
);
1237 type
|= NFNL_SUBSYS_CTNETLINK_EXP
<< 8;
1238 nlh
= NLMSG_PUT(skb
, 0, 0, type
, sizeof(struct nfgenmsg
));
1239 nfmsg
= NLMSG_DATA(nlh
);
1241 nlh
->nlmsg_flags
= flags
;
1242 nfmsg
->nfgen_family
= exp
->tuple
.src
.l3num
;
1243 nfmsg
->version
= NFNETLINK_V0
;
1246 if (ctnetlink_exp_dump_expect(skb
, exp
) < 0)
1247 goto nfattr_failure
;
1249 nlh
->nlmsg_len
= skb
->tail
- b
;
1250 nfnetlink_send(skb
, 0, NFNLGRP_CONNTRACK_EXP_NEW
, 0);
1261 ctnetlink_exp_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1263 struct nf_conntrack_expect
*exp
= NULL
;
1264 struct list_head
*i
;
1265 u_int32_t
*id
= (u_int32_t
*) &cb
->args
[0];
1266 struct nfgenmsg
*nfmsg
= NLMSG_DATA(cb
->nlh
);
1267 u_int8_t l3proto
= nfmsg
->nfgen_family
;
1269 DEBUGP("entered %s, last id=%llu\n", __FUNCTION__
, *id
);
1271 read_lock_bh(&nf_conntrack_lock
);
1272 list_for_each_prev(i
, &nf_conntrack_expect_list
) {
1273 exp
= (struct nf_conntrack_expect
*) i
;
1274 if (l3proto
&& exp
->tuple
.src
.l3num
!= l3proto
)
1278 if (ctnetlink_exp_fill_info(skb
, NETLINK_CB(cb
->skb
).pid
,
1286 read_unlock_bh(&nf_conntrack_lock
);
1288 DEBUGP("leaving, last id=%llu\n", *id
);
1293 static const size_t cta_min_exp
[CTA_EXPECT_MAX
] = {
1294 [CTA_EXPECT_TIMEOUT
-1] = sizeof(u_int32_t
),
1295 [CTA_EXPECT_ID
-1] = sizeof(u_int32_t
)
1299 ctnetlink_get_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1300 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1302 struct nf_conntrack_tuple tuple
;
1303 struct nf_conntrack_expect
*exp
;
1304 struct sk_buff
*skb2
;
1305 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1306 u_int8_t u3
= nfmsg
->nfgen_family
;
1309 DEBUGP("entered %s\n", __FUNCTION__
);
1311 if (nfattr_bad_size(cda
, CTA_EXPECT_MAX
, cta_min_exp
))
1314 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1317 if ((*errp
= netlink_dump_start(ctnl
, skb
, nlh
,
1318 ctnetlink_exp_dump_table
,
1319 ctnetlink_done
)) != 0)
1321 rlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
1322 if (rlen
> skb
->len
)
1324 skb_pull(skb
, rlen
);
1328 if (cda
[CTA_EXPECT_MASTER
-1])
1329 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_MASTER
, u3
);
1336 exp
= nf_conntrack_expect_find(&tuple
);
1340 if (cda
[CTA_EXPECT_ID
-1]) {
1341 u_int32_t id
= *(u_int32_t
*)NFA_DATA(cda
[CTA_EXPECT_ID
-1]);
1342 if (exp
->id
!= ntohl(id
)) {
1343 nf_conntrack_expect_put(exp
);
1349 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1352 NETLINK_CB(skb2
).dst_pid
= NETLINK_CB(skb
).pid
;
1354 err
= ctnetlink_exp_fill_info(skb2
, NETLINK_CB(skb
).pid
,
1355 nlh
->nlmsg_seq
, IPCTNL_MSG_EXP_NEW
,
1360 nf_conntrack_expect_put(exp
);
1362 return netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).pid
, MSG_DONTWAIT
);
1367 nf_conntrack_expect_put(exp
);
1372 ctnetlink_del_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1373 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1375 struct nf_conntrack_expect
*exp
, *tmp
;
1376 struct nf_conntrack_tuple tuple
;
1377 struct nf_conntrack_helper
*h
;
1378 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1379 u_int8_t u3
= nfmsg
->nfgen_family
;
1382 if (nfattr_bad_size(cda
, CTA_EXPECT_MAX
, cta_min_exp
))
1385 if (cda
[CTA_EXPECT_TUPLE
-1]) {
1386 /* delete a single expect by tuple */
1387 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
, u3
);
1391 /* bump usage count to 2 */
1392 exp
= nf_conntrack_expect_find(&tuple
);
1396 if (cda
[CTA_EXPECT_ID
-1]) {
1398 *(u_int32_t
*)NFA_DATA(cda
[CTA_EXPECT_ID
-1]);
1399 if (exp
->id
!= ntohl(id
)) {
1400 nf_conntrack_expect_put(exp
);
1405 /* after list removal, usage count == 1 */
1406 nf_conntrack_unexpect_related(exp
);
1407 /* have to put what we 'get' above.
1408 * after this line usage count == 0 */
1409 nf_conntrack_expect_put(exp
);
1410 } else if (cda
[CTA_EXPECT_HELP_NAME
-1]) {
1411 char *name
= NFA_DATA(cda
[CTA_EXPECT_HELP_NAME
-1]);
1413 /* delete all expectations for this helper */
1414 write_lock_bh(&nf_conntrack_lock
);
1415 h
= __nf_conntrack_helper_find_byname(name
);
1417 write_unlock_bh(&nf_conntrack_lock
);
1420 list_for_each_entry_safe(exp
, tmp
, &nf_conntrack_expect_list
,
1422 struct nf_conn_help
*m_help
= nfct_help(exp
->master
);
1423 if (m_help
->helper
== h
1424 && del_timer(&exp
->timeout
)) {
1425 nf_ct_unlink_expect(exp
);
1426 nf_conntrack_expect_put(exp
);
1429 write_unlock_bh(&nf_conntrack_lock
);
1431 /* This basically means we have to flush everything*/
1432 write_lock_bh(&nf_conntrack_lock
);
1433 list_for_each_entry_safe(exp
, tmp
, &nf_conntrack_expect_list
,
1435 if (del_timer(&exp
->timeout
)) {
1436 nf_ct_unlink_expect(exp
);
1437 nf_conntrack_expect_put(exp
);
1440 write_unlock_bh(&nf_conntrack_lock
);
1446 ctnetlink_change_expect(struct nf_conntrack_expect
*x
, struct nfattr
*cda
[])
1452 ctnetlink_create_expect(struct nfattr
*cda
[], u_int8_t u3
)
1454 struct nf_conntrack_tuple tuple
, mask
, master_tuple
;
1455 struct nf_conntrack_tuple_hash
*h
= NULL
;
1456 struct nf_conntrack_expect
*exp
;
1458 struct nf_conn_help
*help
;
1461 DEBUGP("entered %s\n", __FUNCTION__
);
1463 /* caller guarantees that those three CTA_EXPECT_* exist */
1464 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
, u3
);
1467 err
= ctnetlink_parse_tuple(cda
, &mask
, CTA_EXPECT_MASK
, u3
);
1470 err
= ctnetlink_parse_tuple(cda
, &master_tuple
, CTA_EXPECT_MASTER
, u3
);
1474 /* Look for master conntrack of this expectation */
1475 h
= nf_conntrack_find_get(&master_tuple
, NULL
);
1478 ct
= nf_ct_tuplehash_to_ctrack(h
);
1479 help
= nfct_help(ct
);
1481 if (!help
|| !help
->helper
) {
1482 /* such conntrack hasn't got any helper, abort */
1487 exp
= nf_conntrack_expect_alloc(ct
);
1493 exp
->expectfn
= NULL
;
1496 memcpy(&exp
->tuple
, &tuple
, sizeof(struct nf_conntrack_tuple
));
1497 memcpy(&exp
->mask
, &mask
, sizeof(struct nf_conntrack_tuple
));
1499 err
= nf_conntrack_expect_related(exp
);
1500 nf_conntrack_expect_put(exp
);
1503 nf_ct_put(nf_ct_tuplehash_to_ctrack(h
));
1508 ctnetlink_new_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1509 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1511 struct nf_conntrack_tuple tuple
;
1512 struct nf_conntrack_expect
*exp
;
1513 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1514 u_int8_t u3
= nfmsg
->nfgen_family
;
1517 DEBUGP("entered %s\n", __FUNCTION__
);
1519 if (nfattr_bad_size(cda
, CTA_EXPECT_MAX
, cta_min_exp
))
1522 if (!cda
[CTA_EXPECT_TUPLE
-1]
1523 || !cda
[CTA_EXPECT_MASK
-1]
1524 || !cda
[CTA_EXPECT_MASTER
-1])
1527 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
, u3
);
1531 write_lock_bh(&nf_conntrack_lock
);
1532 exp
= __nf_conntrack_expect_find(&tuple
);
1535 write_unlock_bh(&nf_conntrack_lock
);
1537 if (nlh
->nlmsg_flags
& NLM_F_CREATE
)
1538 err
= ctnetlink_create_expect(cda
, u3
);
1543 if (!(nlh
->nlmsg_flags
& NLM_F_EXCL
))
1544 err
= ctnetlink_change_expect(exp
, cda
);
1545 write_unlock_bh(&nf_conntrack_lock
);
1547 DEBUGP("leaving\n");
1552 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1553 static struct notifier_block ctnl_notifier
= {
1554 .notifier_call
= ctnetlink_conntrack_event
,
1557 static struct notifier_block ctnl_notifier_exp
= {
1558 .notifier_call
= ctnetlink_expect_event
,
1562 static struct nfnl_callback ctnl_cb
[IPCTNL_MSG_MAX
] = {
1563 [IPCTNL_MSG_CT_NEW
] = { .call
= ctnetlink_new_conntrack
,
1564 .attr_count
= CTA_MAX
, },
1565 [IPCTNL_MSG_CT_GET
] = { .call
= ctnetlink_get_conntrack
,
1566 .attr_count
= CTA_MAX
, },
1567 [IPCTNL_MSG_CT_DELETE
] = { .call
= ctnetlink_del_conntrack
,
1568 .attr_count
= CTA_MAX
, },
1569 [IPCTNL_MSG_CT_GET_CTRZERO
] = { .call
= ctnetlink_get_conntrack
,
1570 .attr_count
= CTA_MAX
, },
1573 static struct nfnl_callback ctnl_exp_cb
[IPCTNL_MSG_EXP_MAX
] = {
1574 [IPCTNL_MSG_EXP_GET
] = { .call
= ctnetlink_get_expect
,
1575 .attr_count
= CTA_EXPECT_MAX
, },
1576 [IPCTNL_MSG_EXP_NEW
] = { .call
= ctnetlink_new_expect
,
1577 .attr_count
= CTA_EXPECT_MAX
, },
1578 [IPCTNL_MSG_EXP_DELETE
] = { .call
= ctnetlink_del_expect
,
1579 .attr_count
= CTA_EXPECT_MAX
, },
1582 static struct nfnetlink_subsystem ctnl_subsys
= {
1583 .name
= "conntrack",
1584 .subsys_id
= NFNL_SUBSYS_CTNETLINK
,
1585 .cb_count
= IPCTNL_MSG_MAX
,
1589 static struct nfnetlink_subsystem ctnl_exp_subsys
= {
1590 .name
= "conntrack_expect",
1591 .subsys_id
= NFNL_SUBSYS_CTNETLINK_EXP
,
1592 .cb_count
= IPCTNL_MSG_EXP_MAX
,
1596 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK
);
1597 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP
);
1599 static int __init
ctnetlink_init(void)
1603 printk("ctnetlink v%s: registering with nfnetlink.\n", version
);
1604 ret
= nfnetlink_subsys_register(&ctnl_subsys
);
1606 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1610 ret
= nfnetlink_subsys_register(&ctnl_exp_subsys
);
1612 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1613 goto err_unreg_subsys
;
1616 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1617 ret
= nf_conntrack_register_notifier(&ctnl_notifier
);
1619 printk("ctnetlink_init: cannot register notifier.\n");
1620 goto err_unreg_exp_subsys
;
1623 ret
= nf_conntrack_expect_register_notifier(&ctnl_notifier_exp
);
1625 printk("ctnetlink_init: cannot expect register notifier.\n");
1626 goto err_unreg_notifier
;
1632 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1634 nf_conntrack_unregister_notifier(&ctnl_notifier
);
1635 err_unreg_exp_subsys
:
1636 nfnetlink_subsys_unregister(&ctnl_exp_subsys
);
1639 nfnetlink_subsys_unregister(&ctnl_subsys
);
1644 static void __exit
ctnetlink_exit(void)
1646 printk("ctnetlink: unregistering from nfnetlink.\n");
1648 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1649 nf_conntrack_unregister_notifier(&ctnl_notifier_exp
);
1650 nf_conntrack_unregister_notifier(&ctnl_notifier
);
1653 nfnetlink_subsys_unregister(&ctnl_exp_subsys
);
1654 nfnetlink_subsys_unregister(&ctnl_subsys
);
1658 module_init(ctnetlink_init
);
1659 module_exit(ctnetlink_exit
);