1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
5 * (C) 2002-2005 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005 by Pablo Neira Ayuso <pablo@eurodev.net>
9 * I've reworked this stuff to use attributes instead of conntrack
10 * structures. 5.44 am. I need more tea. --pablo 05/07/11.
12 * Initial connection tracking via netlink development funded and
13 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
15 * Further development of this code funded by Astaro AG (http://www.astaro.com)
17 * This software may be used and distributed according to the terms
18 * of the GNU General Public License, incorporated herein by reference.
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
[] = "0.92";
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
;
172 nest_helper
= NFA_NEST(skb
, CTA_HELP
);
173 NFA_PUT(skb
, CTA_HELP_NAME
, strlen(ct
->helper
->name
), ct
->helper
->name
);
175 if (ct
->helper
->to_nfattr
)
176 ct
->helper
->to_nfattr(skb
, ct
);
178 NFA_NEST_END(skb
, nest_helper
);
186 #ifdef CONFIG_NF_CT_ACCT
188 ctnetlink_dump_counters(struct sk_buff
*skb
, const struct nf_conn
*ct
,
189 enum ip_conntrack_dir dir
)
191 enum ctattr_type type
= dir
? CTA_COUNTERS_REPLY
: CTA_COUNTERS_ORIG
;
192 struct nfattr
*nest_count
= NFA_NEST(skb
, type
);
195 tmp
= htonl(ct
->counters
[dir
].packets
);
196 NFA_PUT(skb
, CTA_COUNTERS32_PACKETS
, sizeof(u_int32_t
), &tmp
);
198 tmp
= htonl(ct
->counters
[dir
].bytes
);
199 NFA_PUT(skb
, CTA_COUNTERS32_BYTES
, sizeof(u_int32_t
), &tmp
);
201 NFA_NEST_END(skb
, nest_count
);
209 #define ctnetlink_dump_counters(a, b, c) (0)
212 #ifdef CONFIG_NF_CONNTRACK_MARK
214 ctnetlink_dump_mark(struct sk_buff
*skb
, const struct nf_conn
*ct
)
216 u_int32_t mark
= htonl(ct
->mark
);
218 NFA_PUT(skb
, CTA_MARK
, sizeof(u_int32_t
), &mark
);
225 #define ctnetlink_dump_mark(a, b) (0)
229 ctnetlink_dump_id(struct sk_buff
*skb
, const struct nf_conn
*ct
)
231 u_int32_t id
= htonl(ct
->id
);
232 NFA_PUT(skb
, CTA_ID
, sizeof(u_int32_t
), &id
);
240 ctnetlink_dump_use(struct sk_buff
*skb
, const struct nf_conn
*ct
)
242 u_int32_t use
= htonl(atomic_read(&ct
->ct_general
.use
));
244 NFA_PUT(skb
, CTA_USE
, sizeof(u_int32_t
), &use
);
251 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
254 ctnetlink_fill_info(struct sk_buff
*skb
, u32 pid
, u32 seq
,
255 int event
, int nowait
,
256 const struct nf_conn
*ct
)
258 struct nlmsghdr
*nlh
;
259 struct nfgenmsg
*nfmsg
;
260 struct nfattr
*nest_parms
;
265 event
|= NFNL_SUBSYS_CTNETLINK
<< 8;
266 nlh
= NLMSG_PUT(skb
, pid
, seq
, event
, sizeof(struct nfgenmsg
));
267 nfmsg
= NLMSG_DATA(nlh
);
269 nlh
->nlmsg_flags
= (nowait
&& pid
) ? NLM_F_MULTI
: 0;
270 nfmsg
->nfgen_family
=
271 ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
;
272 nfmsg
->version
= NFNETLINK_V0
;
275 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_ORIG
);
276 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
278 NFA_NEST_END(skb
, nest_parms
);
280 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_REPLY
);
281 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
283 NFA_NEST_END(skb
, nest_parms
);
285 if (ctnetlink_dump_status(skb
, ct
) < 0 ||
286 ctnetlink_dump_timeout(skb
, ct
) < 0 ||
287 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
288 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0 ||
289 ctnetlink_dump_protoinfo(skb
, ct
) < 0 ||
290 ctnetlink_dump_helpinfo(skb
, ct
) < 0 ||
291 ctnetlink_dump_mark(skb
, ct
) < 0 ||
292 ctnetlink_dump_id(skb
, ct
) < 0 ||
293 ctnetlink_dump_use(skb
, ct
) < 0)
296 nlh
->nlmsg_len
= skb
->tail
- b
;
301 skb_trim(skb
, b
- skb
->data
);
305 #ifdef CONFIG_NF_CONNTRACK_EVENTS
306 static int ctnetlink_conntrack_event(struct notifier_block
*this,
307 unsigned long events
, void *ptr
)
309 struct nlmsghdr
*nlh
;
310 struct nfgenmsg
*nfmsg
;
311 struct nfattr
*nest_parms
;
312 struct nf_conn
*ct
= (struct nf_conn
*)ptr
;
316 unsigned int flags
= 0, group
;
318 /* ignore our fake conntrack entry */
319 if (ct
== &nf_conntrack_untracked
)
322 if (events
& IPCT_DESTROY
) {
323 type
= IPCTNL_MSG_CT_DELETE
;
324 group
= NFNLGRP_CONNTRACK_DESTROY
;
325 } else if (events
& (IPCT_NEW
| IPCT_RELATED
)) {
326 type
= IPCTNL_MSG_CT_NEW
;
327 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
328 /* dump everything */
330 group
= NFNLGRP_CONNTRACK_NEW
;
331 } else if (events
& (IPCT_STATUS
|
336 type
= IPCTNL_MSG_CT_NEW
;
337 group
= NFNLGRP_CONNTRACK_UPDATE
;
341 /* FIXME: Check if there are any listeners before, don't hurt performance */
343 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_ATOMIC
);
349 type
|= NFNL_SUBSYS_CTNETLINK
<< 8;
350 nlh
= NLMSG_PUT(skb
, 0, 0, type
, sizeof(struct nfgenmsg
));
351 nfmsg
= NLMSG_DATA(nlh
);
353 nlh
->nlmsg_flags
= flags
;
354 nfmsg
->nfgen_family
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
;
355 nfmsg
->version
= NFNETLINK_V0
;
358 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_ORIG
);
359 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
361 NFA_NEST_END(skb
, nest_parms
);
363 nest_parms
= NFA_NEST(skb
, CTA_TUPLE_REPLY
);
364 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
366 NFA_NEST_END(skb
, nest_parms
);
368 /* NAT stuff is now a status flag */
369 if ((events
& IPCT_STATUS
|| events
& IPCT_NATINFO
)
370 && ctnetlink_dump_status(skb
, ct
) < 0)
372 if (events
& IPCT_REFRESH
373 && ctnetlink_dump_timeout(skb
, ct
) < 0)
375 if (events
& IPCT_PROTOINFO
376 && ctnetlink_dump_protoinfo(skb
, ct
) < 0)
378 if (events
& IPCT_HELPINFO
379 && ctnetlink_dump_helpinfo(skb
, ct
) < 0)
382 if (ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
383 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0)
386 nlh
->nlmsg_len
= skb
->tail
- b
;
387 nfnetlink_send(skb
, 0, group
, 0);
395 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
397 static int ctnetlink_done(struct netlink_callback
*cb
)
399 DEBUGP("entered %s\n", __FUNCTION__
);
403 #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
406 ctnetlink_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
408 struct nf_conn
*ct
= NULL
;
409 struct nf_conntrack_tuple_hash
*h
;
411 u_int32_t
*id
= (u_int32_t
*) &cb
->args
[1];
412 struct nfgenmsg
*nfmsg
= NLMSG_DATA(cb
->nlh
);
413 u_int8_t l3proto
= nfmsg
->nfgen_family
;
415 DEBUGP("entered %s, last bucket=%lu id=%u\n", __FUNCTION__
,
418 read_lock_bh(&nf_conntrack_lock
);
419 for (; cb
->args
[0] < nf_conntrack_htable_size
; cb
->args
[0]++, *id
= 0) {
420 list_for_each_prev(i
, &nf_conntrack_hash
[cb
->args
[0]]) {
421 h
= (struct nf_conntrack_tuple_hash
*) i
;
422 if (DIRECTION(h
) != IP_CT_DIR_ORIGINAL
)
424 ct
= nf_ct_tuplehash_to_ctrack(h
);
425 /* Dump entries of a given L3 protocol number.
426 * If it is not specified, ie. l3proto == 0,
427 * then dump everything. */
428 if (l3proto
&& L3PROTO(ct
) != l3proto
)
432 if (ctnetlink_fill_info(skb
, NETLINK_CB(cb
->skb
).pid
,
441 read_unlock_bh(&nf_conntrack_lock
);
443 DEBUGP("leaving, last bucket=%lu id=%u\n", cb
->args
[0], *id
);
448 #ifdef CONFIG_NF_CT_ACCT
450 ctnetlink_dump_table_w(struct sk_buff
*skb
, struct netlink_callback
*cb
)
452 struct nf_conn
*ct
= NULL
;
453 struct nf_conntrack_tuple_hash
*h
;
455 u_int32_t
*id
= (u_int32_t
*) &cb
->args
[1];
456 struct nfgenmsg
*nfmsg
= NLMSG_DATA(cb
->nlh
);
457 u_int8_t l3proto
= nfmsg
->nfgen_family
;
459 DEBUGP("entered %s, last bucket=%u id=%u\n", __FUNCTION__
,
462 write_lock_bh(&nf_conntrack_lock
);
463 for (; cb
->args
[0] < nf_conntrack_htable_size
; cb
->args
[0]++, *id
= 0) {
464 list_for_each_prev(i
, &nf_conntrack_hash
[cb
->args
[0]]) {
465 h
= (struct nf_conntrack_tuple_hash
*) i
;
466 if (DIRECTION(h
) != IP_CT_DIR_ORIGINAL
)
468 ct
= nf_ct_tuplehash_to_ctrack(h
);
469 if (l3proto
&& L3PROTO(ct
) != l3proto
)
473 if (ctnetlink_fill_info(skb
, NETLINK_CB(cb
->skb
).pid
,
480 memset(&ct
->counters
, 0, sizeof(ct
->counters
));
484 write_unlock_bh(&nf_conntrack_lock
);
486 DEBUGP("leaving, last bucket=%lu id=%u\n", cb
->args
[0], *id
);
493 ctnetlink_parse_tuple_ip(struct nfattr
*attr
, struct nf_conntrack_tuple
*tuple
)
495 struct nfattr
*tb
[CTA_IP_MAX
];
496 struct nf_conntrack_l3proto
*l3proto
;
499 DEBUGP("entered %s\n", __FUNCTION__
);
501 nfattr_parse_nested(tb
, CTA_IP_MAX
, attr
);
503 l3proto
= nf_ct_l3proto_find_get(tuple
->src
.l3num
);
505 if (likely(l3proto
->nfattr_to_tuple
))
506 ret
= l3proto
->nfattr_to_tuple(tb
, tuple
);
508 nf_ct_l3proto_put(l3proto
);
515 static const size_t cta_min_proto
[CTA_PROTO_MAX
] = {
516 [CTA_PROTO_NUM
-1] = sizeof(u_int8_t
),
520 ctnetlink_parse_tuple_proto(struct nfattr
*attr
,
521 struct nf_conntrack_tuple
*tuple
)
523 struct nfattr
*tb
[CTA_PROTO_MAX
];
524 struct nf_conntrack_protocol
*proto
;
527 DEBUGP("entered %s\n", __FUNCTION__
);
529 nfattr_parse_nested(tb
, CTA_PROTO_MAX
, attr
);
531 if (nfattr_bad_size(tb
, CTA_PROTO_MAX
, cta_min_proto
))
534 if (!tb
[CTA_PROTO_NUM
-1])
536 tuple
->dst
.protonum
= *(u_int8_t
*)NFA_DATA(tb
[CTA_PROTO_NUM
-1]);
538 proto
= nf_ct_proto_find_get(tuple
->src
.l3num
, tuple
->dst
.protonum
);
540 if (likely(proto
->nfattr_to_tuple
))
541 ret
= proto
->nfattr_to_tuple(tb
, tuple
);
543 nf_ct_proto_put(proto
);
549 ctnetlink_parse_tuple(struct nfattr
*cda
[], struct nf_conntrack_tuple
*tuple
,
550 enum ctattr_tuple type
, u_int8_t l3num
)
552 struct nfattr
*tb
[CTA_TUPLE_MAX
];
555 DEBUGP("entered %s\n", __FUNCTION__
);
557 memset(tuple
, 0, sizeof(*tuple
));
559 nfattr_parse_nested(tb
, CTA_TUPLE_MAX
, cda
[type
-1]);
561 if (!tb
[CTA_TUPLE_IP
-1])
564 tuple
->src
.l3num
= l3num
;
566 err
= ctnetlink_parse_tuple_ip(tb
[CTA_TUPLE_IP
-1], tuple
);
570 if (!tb
[CTA_TUPLE_PROTO
-1])
573 err
= ctnetlink_parse_tuple_proto(tb
[CTA_TUPLE_PROTO
-1], tuple
);
577 /* orig and expect tuples get DIR_ORIGINAL */
578 if (type
== CTA_TUPLE_REPLY
)
579 tuple
->dst
.dir
= IP_CT_DIR_REPLY
;
581 tuple
->dst
.dir
= IP_CT_DIR_ORIGINAL
;
583 NF_CT_DUMP_TUPLE(tuple
);
590 #ifdef CONFIG_IP_NF_NAT_NEEDED
591 static const size_t cta_min_protonat
[CTA_PROTONAT_MAX
] = {
592 [CTA_PROTONAT_PORT_MIN
-1] = sizeof(u_int16_t
),
593 [CTA_PROTONAT_PORT_MAX
-1] = sizeof(u_int16_t
),
596 static int ctnetlink_parse_nat_proto(struct nfattr
*attr
,
597 const struct nf_conn
*ct
,
598 struct ip_nat_range
*range
)
600 struct nfattr
*tb
[CTA_PROTONAT_MAX
];
601 struct ip_nat_protocol
*npt
;
603 DEBUGP("entered %s\n", __FUNCTION__
);
605 nfattr_parse_nested(tb
, CTA_PROTONAT_MAX
, attr
);
607 if (nfattr_bad_size(tb
, CTA_PROTONAT_MAX
, cta_min_protonat
))
610 npt
= ip_nat_proto_find_get(ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.protonum
);
612 if (!npt
->nfattr_to_range
) {
613 ip_nat_proto_put(npt
);
617 /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
618 if (npt
->nfattr_to_range(tb
, range
) > 0)
619 range
->flags
|= IP_NAT_RANGE_PROTO_SPECIFIED
;
621 ip_nat_proto_put(npt
);
627 static const size_t cta_min_nat
[CTA_NAT_MAX
] = {
628 [CTA_NAT_MINIP
-1] = sizeof(u_int32_t
),
629 [CTA_NAT_MAXIP
-1] = sizeof(u_int32_t
),
633 ctnetlink_parse_nat(struct nfattr
*cda
[],
634 const struct nf_conn
*ct
, struct ip_nat_range
*range
)
636 struct nfattr
*tb
[CTA_NAT_MAX
];
639 DEBUGP("entered %s\n", __FUNCTION__
);
641 memset(range
, 0, sizeof(*range
));
643 nfattr_parse_nested(tb
, CTA_NAT_MAX
, cda
[CTA_NAT
-1]);
645 if (nfattr_bad_size(tb
, CTA_NAT_MAX
, cta_min_nat
))
648 if (tb
[CTA_NAT_MINIP
-1])
649 range
->min_ip
= *(u_int32_t
*)NFA_DATA(tb
[CTA_NAT_MINIP
-1]);
651 if (!tb
[CTA_NAT_MAXIP
-1])
652 range
->max_ip
= range
->min_ip
;
654 range
->max_ip
= *(u_int32_t
*)NFA_DATA(tb
[CTA_NAT_MAXIP
-1]);
657 range
->flags
|= IP_NAT_RANGE_MAP_IPS
;
659 if (!tb
[CTA_NAT_PROTO
-1])
662 err
= ctnetlink_parse_nat_proto(tb
[CTA_NAT_PROTO
-1], ct
, range
);
672 ctnetlink_parse_help(struct nfattr
*attr
, char **helper_name
)
674 struct nfattr
*tb
[CTA_HELP_MAX
];
676 DEBUGP("entered %s\n", __FUNCTION__
);
678 nfattr_parse_nested(tb
, CTA_HELP_MAX
, attr
);
680 if (!tb
[CTA_HELP_NAME
-1])
683 *helper_name
= NFA_DATA(tb
[CTA_HELP_NAME
-1]);
688 static const size_t cta_min
[CTA_MAX
] = {
689 [CTA_STATUS
-1] = sizeof(u_int32_t
),
690 [CTA_TIMEOUT
-1] = sizeof(u_int32_t
),
691 [CTA_MARK
-1] = sizeof(u_int32_t
),
692 [CTA_USE
-1] = sizeof(u_int32_t
),
693 [CTA_ID
-1] = sizeof(u_int32_t
)
697 ctnetlink_del_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
698 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
700 struct nf_conntrack_tuple_hash
*h
;
701 struct nf_conntrack_tuple tuple
;
703 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
704 u_int8_t u3
= nfmsg
->nfgen_family
;
707 DEBUGP("entered %s\n", __FUNCTION__
);
709 if (nfattr_bad_size(cda
, CTA_MAX
, cta_min
))
712 if (cda
[CTA_TUPLE_ORIG
-1])
713 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
, u3
);
714 else if (cda
[CTA_TUPLE_REPLY
-1])
715 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
, u3
);
717 /* Flush the whole table */
718 nf_conntrack_flush();
725 h
= nf_conntrack_find_get(&tuple
, NULL
);
727 DEBUGP("tuple not found in conntrack hash\n");
731 ct
= nf_ct_tuplehash_to_ctrack(h
);
734 u_int32_t id
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_ID
-1]));
740 if (del_timer(&ct
->timeout
))
741 ct
->timeout
.function((unsigned long)ct
);
750 ctnetlink_get_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
751 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
753 struct nf_conntrack_tuple_hash
*h
;
754 struct nf_conntrack_tuple tuple
;
756 struct sk_buff
*skb2
= NULL
;
757 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
758 u_int8_t u3
= nfmsg
->nfgen_family
;
761 DEBUGP("entered %s\n", __FUNCTION__
);
763 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
766 if (NFNL_MSG_TYPE(nlh
->nlmsg_type
) ==
767 IPCTNL_MSG_CT_GET_CTRZERO
) {
768 #ifdef CONFIG_NF_CT_ACCT
769 if ((*errp
= netlink_dump_start(ctnl
, skb
, nlh
,
770 ctnetlink_dump_table_w
,
771 ctnetlink_done
)) != 0)
777 if ((*errp
= netlink_dump_start(ctnl
, skb
, nlh
,
778 ctnetlink_dump_table
,
779 ctnetlink_done
)) != 0)
783 rlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
790 if (nfattr_bad_size(cda
, CTA_MAX
, cta_min
))
793 if (cda
[CTA_TUPLE_ORIG
-1])
794 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
, u3
);
795 else if (cda
[CTA_TUPLE_REPLY
-1])
796 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
, u3
);
803 h
= nf_conntrack_find_get(&tuple
, NULL
);
805 DEBUGP("tuple not found in conntrack hash");
808 DEBUGP("tuple found\n");
809 ct
= nf_ct_tuplehash_to_ctrack(h
);
812 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
817 NETLINK_CB(skb2
).dst_pid
= NETLINK_CB(skb
).pid
;
819 err
= ctnetlink_fill_info(skb2
, NETLINK_CB(skb
).pid
, nlh
->nlmsg_seq
,
820 IPCTNL_MSG_CT_NEW
, 1, ct
);
825 err
= netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).pid
, MSG_DONTWAIT
);
839 ctnetlink_change_status(struct nf_conn
*ct
, struct nfattr
*cda
[])
842 unsigned status
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_STATUS
-1]));
843 d
= ct
->status
^ status
;
845 if (d
& (IPS_EXPECTED
|IPS_CONFIRMED
|IPS_DYING
))
849 if (d
& IPS_SEEN_REPLY
&& !(status
& IPS_SEEN_REPLY
))
850 /* SEEN_REPLY bit can only be set */
854 if (d
& IPS_ASSURED
&& !(status
& IPS_ASSURED
))
855 /* ASSURED bit can only be set */
858 if (cda
[CTA_NAT
-1]) {
859 #ifndef CONFIG_IP_NF_NAT_NEEDED
862 unsigned int hooknum
;
863 struct ip_nat_range range
;
865 if (ctnetlink_parse_nat(cda
, ct
, &range
) < 0)
868 DEBUGP("NAT: %u.%u.%u.%u-%u.%u.%u.%u:%u-%u\n",
869 NIPQUAD(range
.min_ip
), NIPQUAD(range
.max_ip
),
870 htons(range
.min
.all
), htons(range
.max
.all
));
872 /* This is tricky but it works. ip_nat_setup_info needs the
873 * hook number as parameter, so let's do the correct
874 * conversion and run away */
875 if (status
& IPS_SRC_NAT_DONE
)
876 hooknum
= NF_IP_POST_ROUTING
; /* IP_NAT_MANIP_SRC */
877 else if (status
& IPS_DST_NAT_DONE
)
878 hooknum
= NF_IP_PRE_ROUTING
; /* IP_NAT_MANIP_DST */
880 return -EINVAL
; /* Missing NAT flags */
882 DEBUGP("NAT status: %lu\n",
883 status
& (IPS_NAT_MASK
| IPS_NAT_DONE_MASK
));
885 if (ip_nat_initialized(ct
, HOOK2MANIP(hooknum
)))
887 ip_nat_setup_info(ct
, &range
, hooknum
);
889 DEBUGP("NAT status after setup_info: %lu\n",
890 ct
->status
& (IPS_NAT_MASK
| IPS_NAT_DONE_MASK
));
894 /* Be careful here, modifying NAT bits can screw up things,
895 * so don't let users modify them directly if they don't pass
897 ct
->status
|= status
& ~(IPS_NAT_DONE_MASK
| IPS_NAT_MASK
);
903 ctnetlink_change_helper(struct nf_conn
*ct
, struct nfattr
*cda
[])
905 struct nf_conntrack_helper
*helper
;
909 DEBUGP("entered %s\n", __FUNCTION__
);
911 /* don't change helper of sibling connections */
915 err
= ctnetlink_parse_help(cda
[CTA_HELP
-1], &helpname
);
919 helper
= __nf_conntrack_helper_find_byname(helpname
);
921 if (!strcmp(helpname
, ""))
929 /* we had a helper before ... */
930 nf_ct_remove_expectations(ct
);
933 /* need to zero data of old helper */
934 memset(&ct
->help
, 0, sizeof(ct
->help
));
944 ctnetlink_change_timeout(struct nf_conn
*ct
, struct nfattr
*cda
[])
946 u_int32_t timeout
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_TIMEOUT
-1]));
948 if (!del_timer(&ct
->timeout
))
951 ct
->timeout
.expires
= jiffies
+ timeout
* HZ
;
952 add_timer(&ct
->timeout
);
958 ctnetlink_change_protoinfo(struct nf_conn
*ct
, struct nfattr
*cda
[])
960 struct nfattr
*tb
[CTA_PROTOINFO_MAX
], *attr
= cda
[CTA_PROTOINFO
-1];
961 struct nf_conntrack_protocol
*proto
;
962 u_int16_t npt
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.protonum
;
963 u_int16_t l3num
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
;
966 nfattr_parse_nested(tb
, CTA_PROTOINFO_MAX
, attr
);
968 proto
= nf_ct_proto_find_get(l3num
, npt
);
970 if (proto
->from_nfattr
)
971 err
= proto
->from_nfattr(tb
, ct
);
972 nf_ct_proto_put(proto
);
978 ctnetlink_change_conntrack(struct nf_conn
*ct
, struct nfattr
*cda
[])
982 DEBUGP("entered %s\n", __FUNCTION__
);
984 if (cda
[CTA_HELP
-1]) {
985 err
= ctnetlink_change_helper(ct
, cda
);
990 if (cda
[CTA_TIMEOUT
-1]) {
991 err
= ctnetlink_change_timeout(ct
, cda
);
996 if (cda
[CTA_STATUS
-1]) {
997 err
= ctnetlink_change_status(ct
, cda
);
1002 if (cda
[CTA_PROTOINFO
-1]) {
1003 err
= ctnetlink_change_protoinfo(ct
, cda
);
1008 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
1009 if (cda
[CTA_MARK
-1])
1010 ct
->mark
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_MARK
-1]));
1013 DEBUGP("all done\n");
1018 ctnetlink_create_conntrack(struct nfattr
*cda
[],
1019 struct nf_conntrack_tuple
*otuple
,
1020 struct nf_conntrack_tuple
*rtuple
)
1025 DEBUGP("entered %s\n", __FUNCTION__
);
1027 ct
= nf_conntrack_alloc(otuple
, rtuple
);
1028 if (ct
== NULL
|| IS_ERR(ct
))
1031 if (!cda
[CTA_TIMEOUT
-1])
1033 ct
->timeout
.expires
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_TIMEOUT
-1]));
1035 ct
->timeout
.expires
= jiffies
+ ct
->timeout
.expires
* HZ
;
1036 ct
->status
|= IPS_CONFIRMED
;
1038 err
= ctnetlink_change_status(ct
, cda
);
1042 if (cda
[CTA_PROTOINFO
-1]) {
1043 err
= ctnetlink_change_protoinfo(ct
, cda
);
1048 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
1049 if (cda
[CTA_MARK
-1])
1050 ct
->mark
= ntohl(*(u_int32_t
*)NFA_DATA(cda
[CTA_MARK
-1]));
1053 ct
->helper
= nf_ct_helper_find_get(rtuple
);
1055 add_timer(&ct
->timeout
);
1056 nf_conntrack_hash_insert(ct
);
1059 nf_ct_helper_put(ct
->helper
);
1061 DEBUGP("conntrack with id %u inserted\n", ct
->id
);
1065 nf_conntrack_free(ct
);
1070 ctnetlink_new_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
1071 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1073 struct nf_conntrack_tuple otuple
, rtuple
;
1074 struct nf_conntrack_tuple_hash
*h
= NULL
;
1075 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1076 u_int8_t u3
= nfmsg
->nfgen_family
;
1079 DEBUGP("entered %s\n", __FUNCTION__
);
1081 if (nfattr_bad_size(cda
, CTA_MAX
, cta_min
))
1084 if (cda
[CTA_TUPLE_ORIG
-1]) {
1085 err
= ctnetlink_parse_tuple(cda
, &otuple
, CTA_TUPLE_ORIG
, u3
);
1090 if (cda
[CTA_TUPLE_REPLY
-1]) {
1091 err
= ctnetlink_parse_tuple(cda
, &rtuple
, CTA_TUPLE_REPLY
, u3
);
1096 write_lock_bh(&nf_conntrack_lock
);
1097 if (cda
[CTA_TUPLE_ORIG
-1])
1098 h
= __nf_conntrack_find(&otuple
, NULL
);
1099 else if (cda
[CTA_TUPLE_REPLY
-1])
1100 h
= __nf_conntrack_find(&rtuple
, NULL
);
1103 write_unlock_bh(&nf_conntrack_lock
);
1104 DEBUGP("no such conntrack, create new\n");
1106 if (nlh
->nlmsg_flags
& NLM_F_CREATE
)
1107 err
= ctnetlink_create_conntrack(cda
, &otuple
, &rtuple
);
1110 /* implicit 'else' */
1112 /* we only allow nat config for new conntracks */
1113 if (cda
[CTA_NAT
-1]) {
1118 /* We manipulate the conntrack inside the global conntrack table lock,
1119 * so there's no need to increase the refcount */
1120 DEBUGP("conntrack found\n");
1122 if (!(nlh
->nlmsg_flags
& NLM_F_EXCL
))
1123 err
= ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h
), cda
);
1126 write_unlock_bh(&nf_conntrack_lock
);
1130 /***********************************************************************
1132 ***********************************************************************/
1135 ctnetlink_exp_dump_tuple(struct sk_buff
*skb
,
1136 const struct nf_conntrack_tuple
*tuple
,
1137 enum ctattr_expect type
)
1139 struct nfattr
*nest_parms
= NFA_NEST(skb
, type
);
1141 if (ctnetlink_dump_tuples(skb
, tuple
) < 0)
1142 goto nfattr_failure
;
1144 NFA_NEST_END(skb
, nest_parms
);
1153 ctnetlink_exp_dump_expect(struct sk_buff
*skb
,
1154 const struct nf_conntrack_expect
*exp
)
1156 struct nf_conn
*master
= exp
->master
;
1157 u_int32_t timeout
= htonl((exp
->timeout
.expires
- jiffies
) / HZ
);
1158 u_int32_t id
= htonl(exp
->id
);
1160 if (ctnetlink_exp_dump_tuple(skb
, &exp
->tuple
, CTA_EXPECT_TUPLE
) < 0)
1161 goto nfattr_failure
;
1162 if (ctnetlink_exp_dump_tuple(skb
, &exp
->mask
, CTA_EXPECT_MASK
) < 0)
1163 goto nfattr_failure
;
1164 if (ctnetlink_exp_dump_tuple(skb
,
1165 &master
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
,
1166 CTA_EXPECT_MASTER
) < 0)
1167 goto nfattr_failure
;
1169 NFA_PUT(skb
, CTA_EXPECT_TIMEOUT
, sizeof(timeout
), &timeout
);
1170 NFA_PUT(skb
, CTA_EXPECT_ID
, sizeof(u_int32_t
), &id
);
1179 ctnetlink_exp_fill_info(struct sk_buff
*skb
, u32 pid
, u32 seq
,
1182 const struct nf_conntrack_expect
*exp
)
1184 struct nlmsghdr
*nlh
;
1185 struct nfgenmsg
*nfmsg
;
1190 event
|= NFNL_SUBSYS_CTNETLINK_EXP
<< 8;
1191 nlh
= NLMSG_PUT(skb
, pid
, seq
, event
, sizeof(struct nfgenmsg
));
1192 nfmsg
= NLMSG_DATA(nlh
);
1194 nlh
->nlmsg_flags
= (nowait
&& pid
) ? NLM_F_MULTI
: 0;
1195 nfmsg
->nfgen_family
= exp
->tuple
.src
.l3num
;
1196 nfmsg
->version
= NFNETLINK_V0
;
1199 if (ctnetlink_exp_dump_expect(skb
, exp
) < 0)
1200 goto nfattr_failure
;
1202 nlh
->nlmsg_len
= skb
->tail
- b
;
1207 skb_trim(skb
, b
- skb
->data
);
1211 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1212 static int ctnetlink_expect_event(struct notifier_block
*this,
1213 unsigned long events
, void *ptr
)
1215 struct nlmsghdr
*nlh
;
1216 struct nfgenmsg
*nfmsg
;
1217 struct nf_conntrack_expect
*exp
= (struct nf_conntrack_expect
*)ptr
;
1218 struct sk_buff
*skb
;
1223 if (events
& IPEXP_NEW
) {
1224 type
= IPCTNL_MSG_EXP_NEW
;
1225 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
1229 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_ATOMIC
);
1235 type
|= NFNL_SUBSYS_CTNETLINK_EXP
<< 8;
1236 nlh
= NLMSG_PUT(skb
, 0, 0, type
, sizeof(struct nfgenmsg
));
1237 nfmsg
= NLMSG_DATA(nlh
);
1239 nlh
->nlmsg_flags
= flags
;
1240 nfmsg
->nfgen_family
= exp
->tuple
.src
.l3num
;
1241 nfmsg
->version
= NFNETLINK_V0
;
1244 if (ctnetlink_exp_dump_expect(skb
, exp
) < 0)
1245 goto nfattr_failure
;
1247 nlh
->nlmsg_len
= skb
->tail
- b
;
1248 nfnetlink_send(skb
, 0, NFNLGRP_CONNTRACK_EXP_NEW
, 0);
1259 ctnetlink_exp_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1261 struct nf_conntrack_expect
*exp
= NULL
;
1262 struct list_head
*i
;
1263 u_int32_t
*id
= (u_int32_t
*) &cb
->args
[0];
1264 struct nfgenmsg
*nfmsg
= NLMSG_DATA(cb
->nlh
);
1265 u_int8_t l3proto
= nfmsg
->nfgen_family
;
1267 DEBUGP("entered %s, last id=%llu\n", __FUNCTION__
, *id
);
1269 read_lock_bh(&nf_conntrack_lock
);
1270 list_for_each_prev(i
, &nf_conntrack_expect_list
) {
1271 exp
= (struct nf_conntrack_expect
*) i
;
1272 if (l3proto
&& exp
->tuple
.src
.l3num
!= l3proto
)
1276 if (ctnetlink_exp_fill_info(skb
, NETLINK_CB(cb
->skb
).pid
,
1284 read_unlock_bh(&nf_conntrack_lock
);
1286 DEBUGP("leaving, last id=%llu\n", *id
);
1291 static const size_t cta_min_exp
[CTA_EXPECT_MAX
] = {
1292 [CTA_EXPECT_TIMEOUT
-1] = sizeof(u_int32_t
),
1293 [CTA_EXPECT_ID
-1] = sizeof(u_int32_t
)
1297 ctnetlink_get_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1298 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1300 struct nf_conntrack_tuple tuple
;
1301 struct nf_conntrack_expect
*exp
;
1302 struct sk_buff
*skb2
;
1303 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1304 u_int8_t u3
= nfmsg
->nfgen_family
;
1307 DEBUGP("entered %s\n", __FUNCTION__
);
1309 if (nfattr_bad_size(cda
, CTA_EXPECT_MAX
, cta_min_exp
))
1312 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1315 if ((*errp
= netlink_dump_start(ctnl
, skb
, nlh
,
1316 ctnetlink_exp_dump_table
,
1317 ctnetlink_done
)) != 0)
1319 rlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
1320 if (rlen
> skb
->len
)
1322 skb_pull(skb
, rlen
);
1326 if (cda
[CTA_EXPECT_MASTER
-1])
1327 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_MASTER
, u3
);
1334 exp
= nf_conntrack_expect_find(&tuple
);
1338 if (cda
[CTA_EXPECT_ID
-1]) {
1339 u_int32_t id
= *(u_int32_t
*)NFA_DATA(cda
[CTA_EXPECT_ID
-1]);
1340 if (exp
->id
!= ntohl(id
)) {
1341 nf_conntrack_expect_put(exp
);
1347 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1350 NETLINK_CB(skb2
).dst_pid
= NETLINK_CB(skb
).pid
;
1352 err
= ctnetlink_exp_fill_info(skb2
, NETLINK_CB(skb
).pid
,
1353 nlh
->nlmsg_seq
, IPCTNL_MSG_EXP_NEW
,
1358 nf_conntrack_expect_put(exp
);
1360 return netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).pid
, MSG_DONTWAIT
);
1365 nf_conntrack_expect_put(exp
);
1370 ctnetlink_del_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1371 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1373 struct nf_conntrack_expect
*exp
, *tmp
;
1374 struct nf_conntrack_tuple tuple
;
1375 struct nf_conntrack_helper
*h
;
1376 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1377 u_int8_t u3
= nfmsg
->nfgen_family
;
1380 if (nfattr_bad_size(cda
, CTA_EXPECT_MAX
, cta_min_exp
))
1383 if (cda
[CTA_EXPECT_TUPLE
-1]) {
1384 /* delete a single expect by tuple */
1385 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
, u3
);
1389 /* bump usage count to 2 */
1390 exp
= nf_conntrack_expect_find(&tuple
);
1394 if (cda
[CTA_EXPECT_ID
-1]) {
1396 *(u_int32_t
*)NFA_DATA(cda
[CTA_EXPECT_ID
-1]);
1397 if (exp
->id
!= ntohl(id
)) {
1398 nf_conntrack_expect_put(exp
);
1403 /* after list removal, usage count == 1 */
1404 nf_conntrack_unexpect_related(exp
);
1405 /* have to put what we 'get' above.
1406 * after this line usage count == 0 */
1407 nf_conntrack_expect_put(exp
);
1408 } else if (cda
[CTA_EXPECT_HELP_NAME
-1]) {
1409 char *name
= NFA_DATA(cda
[CTA_EXPECT_HELP_NAME
-1]);
1411 /* delete all expectations for this helper */
1412 write_lock_bh(&nf_conntrack_lock
);
1413 h
= __nf_conntrack_helper_find_byname(name
);
1415 write_unlock_bh(&nf_conntrack_lock
);
1418 list_for_each_entry_safe(exp
, tmp
, &nf_conntrack_expect_list
,
1420 if (exp
->master
->helper
== h
1421 && del_timer(&exp
->timeout
)) {
1422 nf_ct_unlink_expect(exp
);
1423 nf_conntrack_expect_put(exp
);
1426 write_unlock_bh(&nf_conntrack_lock
);
1428 /* This basically means we have to flush everything*/
1429 write_lock_bh(&nf_conntrack_lock
);
1430 list_for_each_entry_safe(exp
, tmp
, &nf_conntrack_expect_list
,
1432 if (del_timer(&exp
->timeout
)) {
1433 nf_ct_unlink_expect(exp
);
1434 nf_conntrack_expect_put(exp
);
1437 write_unlock_bh(&nf_conntrack_lock
);
1443 ctnetlink_change_expect(struct nf_conntrack_expect
*x
, struct nfattr
*cda
[])
1449 ctnetlink_create_expect(struct nfattr
*cda
[], u_int8_t u3
)
1451 struct nf_conntrack_tuple tuple
, mask
, master_tuple
;
1452 struct nf_conntrack_tuple_hash
*h
= NULL
;
1453 struct nf_conntrack_expect
*exp
;
1457 DEBUGP("entered %s\n", __FUNCTION__
);
1459 /* caller guarantees that those three CTA_EXPECT_* exist */
1460 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
, u3
);
1463 err
= ctnetlink_parse_tuple(cda
, &mask
, CTA_EXPECT_MASK
, u3
);
1466 err
= ctnetlink_parse_tuple(cda
, &master_tuple
, CTA_EXPECT_MASTER
, u3
);
1470 /* Look for master conntrack of this expectation */
1471 h
= nf_conntrack_find_get(&master_tuple
, NULL
);
1474 ct
= nf_ct_tuplehash_to_ctrack(h
);
1477 /* such conntrack hasn't got any helper, abort */
1482 exp
= nf_conntrack_expect_alloc(ct
);
1488 exp
->expectfn
= NULL
;
1491 memcpy(&exp
->tuple
, &tuple
, sizeof(struct nf_conntrack_tuple
));
1492 memcpy(&exp
->mask
, &mask
, sizeof(struct nf_conntrack_tuple
));
1494 err
= nf_conntrack_expect_related(exp
);
1495 nf_conntrack_expect_put(exp
);
1498 nf_ct_put(nf_ct_tuplehash_to_ctrack(h
));
1503 ctnetlink_new_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1504 struct nlmsghdr
*nlh
, struct nfattr
*cda
[], int *errp
)
1506 struct nf_conntrack_tuple tuple
;
1507 struct nf_conntrack_expect
*exp
;
1508 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1509 u_int8_t u3
= nfmsg
->nfgen_family
;
1512 DEBUGP("entered %s\n", __FUNCTION__
);
1514 if (nfattr_bad_size(cda
, CTA_EXPECT_MAX
, cta_min_exp
))
1517 if (!cda
[CTA_EXPECT_TUPLE
-1]
1518 || !cda
[CTA_EXPECT_MASK
-1]
1519 || !cda
[CTA_EXPECT_MASTER
-1])
1522 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
, u3
);
1526 write_lock_bh(&nf_conntrack_lock
);
1527 exp
= __nf_conntrack_expect_find(&tuple
);
1530 write_unlock_bh(&nf_conntrack_lock
);
1532 if (nlh
->nlmsg_flags
& NLM_F_CREATE
)
1533 err
= ctnetlink_create_expect(cda
, u3
);
1538 if (!(nlh
->nlmsg_flags
& NLM_F_EXCL
))
1539 err
= ctnetlink_change_expect(exp
, cda
);
1540 write_unlock_bh(&nf_conntrack_lock
);
1542 DEBUGP("leaving\n");
1547 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1548 static struct notifier_block ctnl_notifier
= {
1549 .notifier_call
= ctnetlink_conntrack_event
,
1552 static struct notifier_block ctnl_notifier_exp
= {
1553 .notifier_call
= ctnetlink_expect_event
,
1557 static struct nfnl_callback ctnl_cb
[IPCTNL_MSG_MAX
] = {
1558 [IPCTNL_MSG_CT_NEW
] = { .call
= ctnetlink_new_conntrack
,
1559 .attr_count
= CTA_MAX
, },
1560 [IPCTNL_MSG_CT_GET
] = { .call
= ctnetlink_get_conntrack
,
1561 .attr_count
= CTA_MAX
, },
1562 [IPCTNL_MSG_CT_DELETE
] = { .call
= ctnetlink_del_conntrack
,
1563 .attr_count
= CTA_MAX
, },
1564 [IPCTNL_MSG_CT_GET_CTRZERO
] = { .call
= ctnetlink_get_conntrack
,
1565 .attr_count
= CTA_MAX
, },
1568 static struct nfnl_callback ctnl_exp_cb
[IPCTNL_MSG_EXP_MAX
] = {
1569 [IPCTNL_MSG_EXP_GET
] = { .call
= ctnetlink_get_expect
,
1570 .attr_count
= CTA_EXPECT_MAX
, },
1571 [IPCTNL_MSG_EXP_NEW
] = { .call
= ctnetlink_new_expect
,
1572 .attr_count
= CTA_EXPECT_MAX
, },
1573 [IPCTNL_MSG_EXP_DELETE
] = { .call
= ctnetlink_del_expect
,
1574 .attr_count
= CTA_EXPECT_MAX
, },
1577 static struct nfnetlink_subsystem ctnl_subsys
= {
1578 .name
= "conntrack",
1579 .subsys_id
= NFNL_SUBSYS_CTNETLINK
,
1580 .cb_count
= IPCTNL_MSG_MAX
,
1584 static struct nfnetlink_subsystem ctnl_exp_subsys
= {
1585 .name
= "conntrack_expect",
1586 .subsys_id
= NFNL_SUBSYS_CTNETLINK_EXP
,
1587 .cb_count
= IPCTNL_MSG_EXP_MAX
,
1591 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK
);
1592 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP
);
1594 static int __init
ctnetlink_init(void)
1598 printk("ctnetlink v%s: registering with nfnetlink.\n", version
);
1599 ret
= nfnetlink_subsys_register(&ctnl_subsys
);
1601 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1605 ret
= nfnetlink_subsys_register(&ctnl_exp_subsys
);
1607 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1608 goto err_unreg_subsys
;
1611 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1612 ret
= nf_conntrack_register_notifier(&ctnl_notifier
);
1614 printk("ctnetlink_init: cannot register notifier.\n");
1615 goto err_unreg_exp_subsys
;
1618 ret
= nf_conntrack_expect_register_notifier(&ctnl_notifier_exp
);
1620 printk("ctnetlink_init: cannot expect register notifier.\n");
1621 goto err_unreg_notifier
;
1627 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1629 nf_conntrack_unregister_notifier(&ctnl_notifier
);
1630 err_unreg_exp_subsys
:
1631 nfnetlink_subsys_unregister(&ctnl_exp_subsys
);
1634 nfnetlink_subsys_unregister(&ctnl_subsys
);
1639 static void __exit
ctnetlink_exit(void)
1641 printk("ctnetlink: unregistering from nfnetlink.\n");
1643 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1644 nf_conntrack_unregister_notifier(&ctnl_notifier_exp
);
1645 nf_conntrack_unregister_notifier(&ctnl_notifier
);
1648 nfnetlink_subsys_unregister(&ctnl_exp_subsys
);
1649 nfnetlink_subsys_unregister(&ctnl_subsys
);
1653 module_init(ctnetlink_init
);
1654 module_exit(ctnetlink_exit
);