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) 2005-2008 by Pablo Neira Ayuso <pablo@netfilter.org>
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/rculist.h>
22 #include <linux/types.h>
23 #include <linux/timer.h>
24 #include <linux/skbuff.h>
25 #include <linux/errno.h>
26 #include <linux/netlink.h>
27 #include <linux/spinlock.h>
28 #include <linux/interrupt.h>
29 #include <linux/notifier.h>
31 #include <linux/netfilter.h>
32 #include <net/netlink.h>
33 #include <net/netfilter/nf_conntrack.h>
34 #include <net/netfilter/nf_conntrack_core.h>
35 #include <net/netfilter/nf_conntrack_expect.h>
36 #include <net/netfilter/nf_conntrack_helper.h>
37 #include <net/netfilter/nf_conntrack_l3proto.h>
38 #include <net/netfilter/nf_conntrack_l4proto.h>
39 #include <net/netfilter/nf_conntrack_tuple.h>
40 #include <net/netfilter/nf_conntrack_acct.h>
41 #ifdef CONFIG_NF_NAT_NEEDED
42 #include <net/netfilter/nf_nat_core.h>
43 #include <net/netfilter/nf_nat_protocol.h>
46 #include <linux/netfilter/nfnetlink.h>
47 #include <linux/netfilter/nfnetlink_conntrack.h>
49 MODULE_LICENSE("GPL");
51 static char __initdata version
[] = "0.93";
54 ctnetlink_dump_tuples_proto(struct sk_buff
*skb
,
55 const struct nf_conntrack_tuple
*tuple
,
56 struct nf_conntrack_l4proto
*l4proto
)
59 struct nlattr
*nest_parms
;
61 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_PROTO
| NLA_F_NESTED
);
64 NLA_PUT_U8(skb
, CTA_PROTO_NUM
, tuple
->dst
.protonum
);
66 if (likely(l4proto
->tuple_to_nlattr
))
67 ret
= l4proto
->tuple_to_nlattr(skb
, tuple
);
69 nla_nest_end(skb
, nest_parms
);
78 ctnetlink_dump_tuples_ip(struct sk_buff
*skb
,
79 const struct nf_conntrack_tuple
*tuple
,
80 struct nf_conntrack_l3proto
*l3proto
)
83 struct nlattr
*nest_parms
;
85 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_IP
| NLA_F_NESTED
);
89 if (likely(l3proto
->tuple_to_nlattr
))
90 ret
= l3proto
->tuple_to_nlattr(skb
, tuple
);
92 nla_nest_end(skb
, nest_parms
);
101 ctnetlink_dump_tuples(struct sk_buff
*skb
,
102 const struct nf_conntrack_tuple
*tuple
)
105 struct nf_conntrack_l3proto
*l3proto
;
106 struct nf_conntrack_l4proto
*l4proto
;
108 l3proto
= nf_ct_l3proto_find_get(tuple
->src
.l3num
);
109 ret
= ctnetlink_dump_tuples_ip(skb
, tuple
, l3proto
);
110 nf_ct_l3proto_put(l3proto
);
112 if (unlikely(ret
< 0))
115 l4proto
= nf_ct_l4proto_find_get(tuple
->src
.l3num
, tuple
->dst
.protonum
);
116 ret
= ctnetlink_dump_tuples_proto(skb
, tuple
, l4proto
);
117 nf_ct_l4proto_put(l4proto
);
123 ctnetlink_dump_status(struct sk_buff
*skb
, const struct nf_conn
*ct
)
125 NLA_PUT_BE32(skb
, CTA_STATUS
, htonl(ct
->status
));
133 ctnetlink_dump_timeout(struct sk_buff
*skb
, const struct nf_conn
*ct
)
135 long timeout
= (ct
->timeout
.expires
- jiffies
) / HZ
;
140 NLA_PUT_BE32(skb
, CTA_TIMEOUT
, htonl(timeout
));
148 ctnetlink_dump_protoinfo(struct sk_buff
*skb
, const struct nf_conn
*ct
)
150 struct nf_conntrack_l4proto
*l4proto
;
151 struct nlattr
*nest_proto
;
154 l4proto
= nf_ct_l4proto_find_get(nf_ct_l3num(ct
), nf_ct_protonum(ct
));
155 if (!l4proto
->to_nlattr
) {
156 nf_ct_l4proto_put(l4proto
);
160 nest_proto
= nla_nest_start(skb
, CTA_PROTOINFO
| NLA_F_NESTED
);
162 goto nla_put_failure
;
164 ret
= l4proto
->to_nlattr(skb
, nest_proto
, ct
);
166 nf_ct_l4proto_put(l4proto
);
168 nla_nest_end(skb
, nest_proto
);
173 nf_ct_l4proto_put(l4proto
);
178 ctnetlink_dump_helpinfo(struct sk_buff
*skb
, const struct nf_conn
*ct
)
180 struct nlattr
*nest_helper
;
181 const struct nf_conn_help
*help
= nfct_help(ct
);
182 struct nf_conntrack_helper
*helper
;
188 helper
= rcu_dereference(help
->helper
);
192 nest_helper
= nla_nest_start(skb
, CTA_HELP
| NLA_F_NESTED
);
194 goto nla_put_failure
;
195 NLA_PUT_STRING(skb
, CTA_HELP_NAME
, helper
->name
);
197 if (helper
->to_nlattr
)
198 helper
->to_nlattr(skb
, ct
);
200 nla_nest_end(skb
, nest_helper
);
211 ctnetlink_dump_counters(struct sk_buff
*skb
, const struct nf_conn
*ct
,
212 enum ip_conntrack_dir dir
)
214 enum ctattr_type type
= dir
? CTA_COUNTERS_REPLY
: CTA_COUNTERS_ORIG
;
215 struct nlattr
*nest_count
;
216 const struct nf_conn_counter
*acct
;
218 acct
= nf_conn_acct_find(ct
);
222 nest_count
= nla_nest_start(skb
, type
| NLA_F_NESTED
);
224 goto nla_put_failure
;
226 NLA_PUT_BE64(skb
, CTA_COUNTERS_PACKETS
,
227 cpu_to_be64(acct
[dir
].packets
));
228 NLA_PUT_BE64(skb
, CTA_COUNTERS_BYTES
,
229 cpu_to_be64(acct
[dir
].bytes
));
231 nla_nest_end(skb
, nest_count
);
239 #ifdef CONFIG_NF_CONNTRACK_MARK
241 ctnetlink_dump_mark(struct sk_buff
*skb
, const struct nf_conn
*ct
)
243 NLA_PUT_BE32(skb
, CTA_MARK
, htonl(ct
->mark
));
250 #define ctnetlink_dump_mark(a, b) (0)
253 #ifdef CONFIG_NF_CONNTRACK_SECMARK
255 ctnetlink_dump_secmark(struct sk_buff
*skb
, const struct nf_conn
*ct
)
257 NLA_PUT_BE32(skb
, CTA_SECMARK
, htonl(ct
->secmark
));
264 #define ctnetlink_dump_secmark(a, b) (0)
267 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
270 ctnetlink_dump_master(struct sk_buff
*skb
, const struct nf_conn
*ct
)
272 struct nlattr
*nest_parms
;
274 if (!(ct
->status
& IPS_EXPECTED
))
277 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_MASTER
| NLA_F_NESTED
);
279 goto nla_put_failure
;
280 if (ctnetlink_dump_tuples(skb
, master_tuple(ct
)) < 0)
281 goto nla_put_failure
;
282 nla_nest_end(skb
, nest_parms
);
290 #ifdef CONFIG_NF_NAT_NEEDED
292 dump_nat_seq_adj(struct sk_buff
*skb
, const struct nf_nat_seq
*natseq
, int type
)
294 struct nlattr
*nest_parms
;
296 nest_parms
= nla_nest_start(skb
, type
| NLA_F_NESTED
);
298 goto nla_put_failure
;
300 NLA_PUT_BE32(skb
, CTA_NAT_SEQ_CORRECTION_POS
,
301 htonl(natseq
->correction_pos
));
302 NLA_PUT_BE32(skb
, CTA_NAT_SEQ_OFFSET_BEFORE
,
303 htonl(natseq
->offset_before
));
304 NLA_PUT_BE32(skb
, CTA_NAT_SEQ_OFFSET_AFTER
,
305 htonl(natseq
->offset_after
));
307 nla_nest_end(skb
, nest_parms
);
316 ctnetlink_dump_nat_seq_adj(struct sk_buff
*skb
, const struct nf_conn
*ct
)
318 struct nf_nat_seq
*natseq
;
319 struct nf_conn_nat
*nat
= nfct_nat(ct
);
321 if (!(ct
->status
& IPS_SEQ_ADJUST
) || !nat
)
324 natseq
= &nat
->seq
[IP_CT_DIR_ORIGINAL
];
325 if (dump_nat_seq_adj(skb
, natseq
, CTA_NAT_SEQ_ADJ_ORIG
) == -1)
328 natseq
= &nat
->seq
[IP_CT_DIR_REPLY
];
329 if (dump_nat_seq_adj(skb
, natseq
, CTA_NAT_SEQ_ADJ_REPLY
) == -1)
335 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
339 ctnetlink_dump_id(struct sk_buff
*skb
, const struct nf_conn
*ct
)
341 NLA_PUT_BE32(skb
, CTA_ID
, htonl((unsigned long)ct
));
349 ctnetlink_dump_use(struct sk_buff
*skb
, const struct nf_conn
*ct
)
351 NLA_PUT_BE32(skb
, CTA_USE
, htonl(atomic_read(&ct
->ct_general
.use
)));
358 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
361 ctnetlink_fill_info(struct sk_buff
*skb
, u32 pid
, u32 seq
,
362 int event
, int nowait
,
363 const struct nf_conn
*ct
)
365 struct nlmsghdr
*nlh
;
366 struct nfgenmsg
*nfmsg
;
367 struct nlattr
*nest_parms
;
368 unsigned char *b
= skb_tail_pointer(skb
);
370 event
|= NFNL_SUBSYS_CTNETLINK
<< 8;
371 nlh
= NLMSG_PUT(skb
, pid
, seq
, event
, sizeof(struct nfgenmsg
));
372 nfmsg
= NLMSG_DATA(nlh
);
374 nlh
->nlmsg_flags
= (nowait
&& pid
) ? NLM_F_MULTI
: 0;
375 nfmsg
->nfgen_family
= nf_ct_l3num(ct
);
376 nfmsg
->version
= NFNETLINK_V0
;
379 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_ORIG
| NLA_F_NESTED
);
381 goto nla_put_failure
;
382 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
383 goto nla_put_failure
;
384 nla_nest_end(skb
, nest_parms
);
386 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_REPLY
| NLA_F_NESTED
);
388 goto nla_put_failure
;
389 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
390 goto nla_put_failure
;
391 nla_nest_end(skb
, nest_parms
);
393 if (ctnetlink_dump_status(skb
, ct
) < 0 ||
394 ctnetlink_dump_timeout(skb
, ct
) < 0 ||
395 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
396 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0 ||
397 ctnetlink_dump_protoinfo(skb
, ct
) < 0 ||
398 ctnetlink_dump_helpinfo(skb
, ct
) < 0 ||
399 ctnetlink_dump_mark(skb
, ct
) < 0 ||
400 ctnetlink_dump_secmark(skb
, ct
) < 0 ||
401 ctnetlink_dump_id(skb
, ct
) < 0 ||
402 ctnetlink_dump_use(skb
, ct
) < 0 ||
403 ctnetlink_dump_master(skb
, ct
) < 0 ||
404 ctnetlink_dump_nat_seq_adj(skb
, ct
) < 0)
405 goto nla_put_failure
;
407 nlh
->nlmsg_len
= skb_tail_pointer(skb
) - b
;
416 #ifdef CONFIG_NF_CONNTRACK_EVENTS
417 static int ctnetlink_conntrack_event(struct notifier_block
*this,
418 unsigned long events
, void *ptr
)
420 struct nlmsghdr
*nlh
;
421 struct nfgenmsg
*nfmsg
;
422 struct nlattr
*nest_parms
;
423 struct nf_conn
*ct
= (struct nf_conn
*)ptr
;
427 unsigned int flags
= 0, group
;
429 /* ignore our fake conntrack entry */
430 if (ct
== &nf_conntrack_untracked
)
433 if (events
& IPCT_DESTROY
) {
434 type
= IPCTNL_MSG_CT_DELETE
;
435 group
= NFNLGRP_CONNTRACK_DESTROY
;
436 } else if (events
& (IPCT_NEW
| IPCT_RELATED
)) {
437 type
= IPCTNL_MSG_CT_NEW
;
438 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
439 group
= NFNLGRP_CONNTRACK_NEW
;
440 } else if (events
& (IPCT_STATUS
| IPCT_PROTOINFO
)) {
441 type
= IPCTNL_MSG_CT_NEW
;
442 group
= NFNLGRP_CONNTRACK_UPDATE
;
446 if (!nfnetlink_has_listeners(group
))
449 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_ATOMIC
);
455 type
|= NFNL_SUBSYS_CTNETLINK
<< 8;
456 nlh
= NLMSG_PUT(skb
, 0, 0, type
, sizeof(struct nfgenmsg
));
457 nfmsg
= NLMSG_DATA(nlh
);
459 nlh
->nlmsg_flags
= flags
;
460 nfmsg
->nfgen_family
= nf_ct_l3num(ct
);
461 nfmsg
->version
= NFNETLINK_V0
;
464 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_ORIG
| NLA_F_NESTED
);
466 goto nla_put_failure
;
467 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
468 goto nla_put_failure
;
469 nla_nest_end(skb
, nest_parms
);
471 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_REPLY
| NLA_F_NESTED
);
473 goto nla_put_failure
;
474 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
475 goto nla_put_failure
;
476 nla_nest_end(skb
, nest_parms
);
478 if (ctnetlink_dump_id(skb
, ct
) < 0)
479 goto nla_put_failure
;
481 if (ctnetlink_dump_status(skb
, ct
) < 0)
482 goto nla_put_failure
;
484 if (events
& IPCT_DESTROY
) {
485 if (ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
486 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0)
487 goto nla_put_failure
;
489 if (ctnetlink_dump_timeout(skb
, ct
) < 0)
490 goto nla_put_failure
;
492 if (events
& IPCT_PROTOINFO
493 && ctnetlink_dump_protoinfo(skb
, ct
) < 0)
494 goto nla_put_failure
;
496 if ((events
& IPCT_HELPER
|| nfct_help(ct
))
497 && ctnetlink_dump_helpinfo(skb
, ct
) < 0)
498 goto nla_put_failure
;
500 #ifdef CONFIG_NF_CONNTRACK_SECMARK
501 if ((events
& IPCT_SECMARK
|| ct
->secmark
)
502 && ctnetlink_dump_secmark(skb
, ct
) < 0)
503 goto nla_put_failure
;
506 if (events
& IPCT_RELATED
&&
507 ctnetlink_dump_master(skb
, ct
) < 0)
508 goto nla_put_failure
;
510 if (events
& IPCT_NATSEQADJ
&&
511 ctnetlink_dump_nat_seq_adj(skb
, ct
) < 0)
512 goto nla_put_failure
;
515 #ifdef CONFIG_NF_CONNTRACK_MARK
516 if ((events
& IPCT_MARK
|| ct
->mark
)
517 && ctnetlink_dump_mark(skb
, ct
) < 0)
518 goto nla_put_failure
;
521 nlh
->nlmsg_len
= skb
->tail
- b
;
522 nfnetlink_send(skb
, 0, group
, 0);
530 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
532 static int ctnetlink_done(struct netlink_callback
*cb
)
535 nf_ct_put((struct nf_conn
*)cb
->args
[1]);
540 ctnetlink_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
542 struct nf_conn
*ct
, *last
;
543 struct nf_conntrack_tuple_hash
*h
;
544 struct hlist_node
*n
;
545 struct nfgenmsg
*nfmsg
= NLMSG_DATA(cb
->nlh
);
546 u_int8_t l3proto
= nfmsg
->nfgen_family
;
549 last
= (struct nf_conn
*)cb
->args
[1];
550 for (; cb
->args
[0] < nf_conntrack_htable_size
; cb
->args
[0]++) {
552 hlist_for_each_entry_rcu(h
, n
, &nf_conntrack_hash
[cb
->args
[0]],
554 if (NF_CT_DIRECTION(h
) != IP_CT_DIR_ORIGINAL
)
556 ct
= nf_ct_tuplehash_to_ctrack(h
);
557 /* Dump entries of a given L3 protocol number.
558 * If it is not specified, ie. l3proto == 0,
559 * then dump everything. */
560 if (l3proto
&& nf_ct_l3num(ct
) != l3proto
)
567 if (ctnetlink_fill_info(skb
, NETLINK_CB(cb
->skb
).pid
,
571 if (!atomic_inc_not_zero(&ct
->ct_general
.use
))
573 cb
->args
[1] = (unsigned long)ct
;
577 if (NFNL_MSG_TYPE(cb
->nlh
->nlmsg_type
) ==
578 IPCTNL_MSG_CT_GET_CTRZERO
) {
579 struct nf_conn_counter
*acct
;
581 acct
= nf_conn_acct_find(ct
);
583 memset(acct
, 0, sizeof(struct nf_conn_counter
[IP_CT_DIR_MAX
]));
600 ctnetlink_parse_tuple_ip(struct nlattr
*attr
, struct nf_conntrack_tuple
*tuple
)
602 struct nlattr
*tb
[CTA_IP_MAX
+1];
603 struct nf_conntrack_l3proto
*l3proto
;
606 nla_parse_nested(tb
, CTA_IP_MAX
, attr
, NULL
);
608 l3proto
= nf_ct_l3proto_find_get(tuple
->src
.l3num
);
610 if (likely(l3proto
->nlattr_to_tuple
)) {
611 ret
= nla_validate_nested(attr
, CTA_IP_MAX
,
612 l3proto
->nla_policy
);
614 ret
= l3proto
->nlattr_to_tuple(tb
, tuple
);
617 nf_ct_l3proto_put(l3proto
);
622 static const struct nla_policy proto_nla_policy
[CTA_PROTO_MAX
+1] = {
623 [CTA_PROTO_NUM
] = { .type
= NLA_U8
},
627 ctnetlink_parse_tuple_proto(struct nlattr
*attr
,
628 struct nf_conntrack_tuple
*tuple
)
630 struct nlattr
*tb
[CTA_PROTO_MAX
+1];
631 struct nf_conntrack_l4proto
*l4proto
;
634 ret
= nla_parse_nested(tb
, CTA_PROTO_MAX
, attr
, proto_nla_policy
);
638 if (!tb
[CTA_PROTO_NUM
])
640 tuple
->dst
.protonum
= nla_get_u8(tb
[CTA_PROTO_NUM
]);
642 l4proto
= nf_ct_l4proto_find_get(tuple
->src
.l3num
, tuple
->dst
.protonum
);
644 if (likely(l4proto
->nlattr_to_tuple
)) {
645 ret
= nla_validate_nested(attr
, CTA_PROTO_MAX
,
646 l4proto
->nla_policy
);
648 ret
= l4proto
->nlattr_to_tuple(tb
, tuple
);
651 nf_ct_l4proto_put(l4proto
);
657 ctnetlink_parse_tuple(struct nlattr
*cda
[], struct nf_conntrack_tuple
*tuple
,
658 enum ctattr_tuple type
, u_int8_t l3num
)
660 struct nlattr
*tb
[CTA_TUPLE_MAX
+1];
663 memset(tuple
, 0, sizeof(*tuple
));
665 nla_parse_nested(tb
, CTA_TUPLE_MAX
, cda
[type
], NULL
);
667 if (!tb
[CTA_TUPLE_IP
])
670 tuple
->src
.l3num
= l3num
;
672 err
= ctnetlink_parse_tuple_ip(tb
[CTA_TUPLE_IP
], tuple
);
676 if (!tb
[CTA_TUPLE_PROTO
])
679 err
= ctnetlink_parse_tuple_proto(tb
[CTA_TUPLE_PROTO
], tuple
);
683 /* orig and expect tuples get DIR_ORIGINAL */
684 if (type
== CTA_TUPLE_REPLY
)
685 tuple
->dst
.dir
= IP_CT_DIR_REPLY
;
687 tuple
->dst
.dir
= IP_CT_DIR_ORIGINAL
;
692 #ifdef CONFIG_NF_NAT_NEEDED
693 static const struct nla_policy protonat_nla_policy
[CTA_PROTONAT_MAX
+1] = {
694 [CTA_PROTONAT_PORT_MIN
] = { .type
= NLA_U16
},
695 [CTA_PROTONAT_PORT_MAX
] = { .type
= NLA_U16
},
698 static int nfnetlink_parse_nat_proto(struct nlattr
*attr
,
699 const struct nf_conn
*ct
,
700 struct nf_nat_range
*range
)
702 struct nlattr
*tb
[CTA_PROTONAT_MAX
+1];
703 const struct nf_nat_protocol
*npt
;
706 err
= nla_parse_nested(tb
, CTA_PROTONAT_MAX
, attr
, protonat_nla_policy
);
710 npt
= nf_nat_proto_find_get(nf_ct_protonum(ct
));
711 if (npt
->nlattr_to_range
)
712 err
= npt
->nlattr_to_range(tb
, range
);
713 nf_nat_proto_put(npt
);
717 static const struct nla_policy nat_nla_policy
[CTA_NAT_MAX
+1] = {
718 [CTA_NAT_MINIP
] = { .type
= NLA_U32
},
719 [CTA_NAT_MAXIP
] = { .type
= NLA_U32
},
723 nfnetlink_parse_nat(struct nlattr
*nat
,
724 const struct nf_conn
*ct
, struct nf_nat_range
*range
)
726 struct nlattr
*tb
[CTA_NAT_MAX
+1];
729 memset(range
, 0, sizeof(*range
));
731 err
= nla_parse_nested(tb
, CTA_NAT_MAX
, nat
, nat_nla_policy
);
735 if (tb
[CTA_NAT_MINIP
])
736 range
->min_ip
= nla_get_be32(tb
[CTA_NAT_MINIP
]);
738 if (!tb
[CTA_NAT_MAXIP
])
739 range
->max_ip
= range
->min_ip
;
741 range
->max_ip
= nla_get_be32(tb
[CTA_NAT_MAXIP
]);
744 range
->flags
|= IP_NAT_RANGE_MAP_IPS
;
746 if (!tb
[CTA_NAT_PROTO
])
749 err
= nfnetlink_parse_nat_proto(tb
[CTA_NAT_PROTO
], ct
, range
);
758 ctnetlink_parse_help(struct nlattr
*attr
, char **helper_name
)
760 struct nlattr
*tb
[CTA_HELP_MAX
+1];
762 nla_parse_nested(tb
, CTA_HELP_MAX
, attr
, NULL
);
764 if (!tb
[CTA_HELP_NAME
])
767 *helper_name
= nla_data(tb
[CTA_HELP_NAME
]);
772 static const struct nla_policy ct_nla_policy
[CTA_MAX
+1] = {
773 [CTA_STATUS
] = { .type
= NLA_U32
},
774 [CTA_TIMEOUT
] = { .type
= NLA_U32
},
775 [CTA_MARK
] = { .type
= NLA_U32
},
776 [CTA_USE
] = { .type
= NLA_U32
},
777 [CTA_ID
] = { .type
= NLA_U32
},
781 ctnetlink_del_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
782 struct nlmsghdr
*nlh
, struct nlattr
*cda
[])
784 struct nf_conntrack_tuple_hash
*h
;
785 struct nf_conntrack_tuple tuple
;
787 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
788 u_int8_t u3
= nfmsg
->nfgen_family
;
791 if (cda
[CTA_TUPLE_ORIG
])
792 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
, u3
);
793 else if (cda
[CTA_TUPLE_REPLY
])
794 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
, u3
);
796 /* Flush the whole table */
797 nf_conntrack_flush();
804 h
= nf_conntrack_find_get(&tuple
);
808 ct
= nf_ct_tuplehash_to_ctrack(h
);
811 u_int32_t id
= ntohl(nla_get_be32(cda
[CTA_ID
]));
812 if (id
!= (u32
)(unsigned long)ct
) {
825 ctnetlink_get_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
826 struct nlmsghdr
*nlh
, struct nlattr
*cda
[])
828 struct nf_conntrack_tuple_hash
*h
;
829 struct nf_conntrack_tuple tuple
;
831 struct sk_buff
*skb2
= NULL
;
832 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
833 u_int8_t u3
= nfmsg
->nfgen_family
;
836 if (nlh
->nlmsg_flags
& NLM_F_DUMP
)
837 return netlink_dump_start(ctnl
, skb
, nlh
, ctnetlink_dump_table
,
840 if (cda
[CTA_TUPLE_ORIG
])
841 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
, u3
);
842 else if (cda
[CTA_TUPLE_REPLY
])
843 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
, u3
);
850 h
= nf_conntrack_find_get(&tuple
);
854 ct
= nf_ct_tuplehash_to_ctrack(h
);
857 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
863 err
= ctnetlink_fill_info(skb2
, NETLINK_CB(skb
).pid
, nlh
->nlmsg_seq
,
864 IPCTNL_MSG_CT_NEW
, 1, ct
);
869 err
= netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).pid
, MSG_DONTWAIT
);
882 ctnetlink_change_status(struct nf_conn
*ct
, struct nlattr
*cda
[])
885 unsigned int status
= ntohl(nla_get_be32(cda
[CTA_STATUS
]));
886 d
= ct
->status
^ status
;
888 if (d
& (IPS_EXPECTED
|IPS_CONFIRMED
|IPS_DYING
))
892 if (d
& IPS_SEEN_REPLY
&& !(status
& IPS_SEEN_REPLY
))
893 /* SEEN_REPLY bit can only be set */
896 if (d
& IPS_ASSURED
&& !(status
& IPS_ASSURED
))
897 /* ASSURED bit can only be set */
900 if (cda
[CTA_NAT_SRC
] || cda
[CTA_NAT_DST
]) {
901 #ifndef CONFIG_NF_NAT_NEEDED
904 struct nf_nat_range range
;
906 if (cda
[CTA_NAT_DST
]) {
907 if (nfnetlink_parse_nat(cda
[CTA_NAT_DST
], ct
,
910 if (nf_nat_initialized(ct
, IP_NAT_MANIP_DST
))
912 nf_nat_setup_info(ct
, &range
, IP_NAT_MANIP_DST
);
914 if (cda
[CTA_NAT_SRC
]) {
915 if (nfnetlink_parse_nat(cda
[CTA_NAT_SRC
], ct
,
918 if (nf_nat_initialized(ct
, IP_NAT_MANIP_SRC
))
920 nf_nat_setup_info(ct
, &range
, IP_NAT_MANIP_SRC
);
925 /* Be careful here, modifying NAT bits can screw up things,
926 * so don't let users modify them directly if they don't pass
928 ct
->status
|= status
& ~(IPS_NAT_DONE_MASK
| IPS_NAT_MASK
);
934 ctnetlink_change_helper(struct nf_conn
*ct
, struct nlattr
*cda
[])
936 struct nf_conntrack_helper
*helper
;
937 struct nf_conn_help
*help
= nfct_help(ct
);
941 /* don't change helper of sibling connections */
945 err
= ctnetlink_parse_help(cda
[CTA_HELP
], &helpname
);
949 if (!strcmp(helpname
, "")) {
950 if (help
&& help
->helper
) {
951 /* we had a helper before ... */
952 nf_ct_remove_expectations(ct
);
953 rcu_assign_pointer(help
->helper
, NULL
);
959 helper
= __nf_conntrack_helper_find_byname(helpname
);
964 if (help
->helper
== helper
)
968 /* need to zero data of old helper */
969 memset(&help
->help
, 0, sizeof(help
->help
));
971 help
= nf_ct_helper_ext_add(ct
, GFP_KERNEL
);
976 rcu_assign_pointer(help
->helper
, helper
);
982 ctnetlink_change_timeout(struct nf_conn
*ct
, struct nlattr
*cda
[])
984 u_int32_t timeout
= ntohl(nla_get_be32(cda
[CTA_TIMEOUT
]));
986 if (!del_timer(&ct
->timeout
))
989 ct
->timeout
.expires
= jiffies
+ timeout
* HZ
;
990 add_timer(&ct
->timeout
);
996 ctnetlink_change_protoinfo(struct nf_conn
*ct
, struct nlattr
*cda
[])
998 struct nlattr
*tb
[CTA_PROTOINFO_MAX
+1], *attr
= cda
[CTA_PROTOINFO
];
999 struct nf_conntrack_l4proto
*l4proto
;
1002 nla_parse_nested(tb
, CTA_PROTOINFO_MAX
, attr
, NULL
);
1004 l4proto
= nf_ct_l4proto_find_get(nf_ct_l3num(ct
), nf_ct_protonum(ct
));
1005 if (l4proto
->from_nlattr
)
1006 err
= l4proto
->from_nlattr(tb
, ct
);
1007 nf_ct_l4proto_put(l4proto
);
1012 #ifdef CONFIG_NF_NAT_NEEDED
1014 change_nat_seq_adj(struct nf_nat_seq
*natseq
, struct nlattr
*attr
)
1016 struct nlattr
*cda
[CTA_NAT_SEQ_MAX
+1];
1018 nla_parse_nested(cda
, CTA_NAT_SEQ_MAX
, attr
, NULL
);
1020 if (!cda
[CTA_NAT_SEQ_CORRECTION_POS
])
1023 natseq
->correction_pos
=
1024 ntohl(nla_get_be32(cda
[CTA_NAT_SEQ_CORRECTION_POS
]));
1026 if (!cda
[CTA_NAT_SEQ_OFFSET_BEFORE
])
1029 natseq
->offset_before
=
1030 ntohl(nla_get_be32(cda
[CTA_NAT_SEQ_OFFSET_BEFORE
]));
1032 if (!cda
[CTA_NAT_SEQ_OFFSET_AFTER
])
1035 natseq
->offset_after
=
1036 ntohl(nla_get_be32(cda
[CTA_NAT_SEQ_OFFSET_AFTER
]));
1042 ctnetlink_change_nat_seq_adj(struct nf_conn
*ct
, struct nlattr
*cda
[])
1045 struct nf_conn_nat
*nat
= nfct_nat(ct
);
1050 if (cda
[CTA_NAT_SEQ_ADJ_ORIG
]) {
1051 ret
= change_nat_seq_adj(&nat
->seq
[IP_CT_DIR_ORIGINAL
],
1052 cda
[CTA_NAT_SEQ_ADJ_ORIG
]);
1056 ct
->status
|= IPS_SEQ_ADJUST
;
1059 if (cda
[CTA_NAT_SEQ_ADJ_REPLY
]) {
1060 ret
= change_nat_seq_adj(&nat
->seq
[IP_CT_DIR_REPLY
],
1061 cda
[CTA_NAT_SEQ_ADJ_REPLY
]);
1065 ct
->status
|= IPS_SEQ_ADJUST
;
1073 ctnetlink_change_conntrack(struct nf_conn
*ct
, struct nlattr
*cda
[])
1077 if (cda
[CTA_HELP
]) {
1078 err
= ctnetlink_change_helper(ct
, cda
);
1083 if (cda
[CTA_TIMEOUT
]) {
1084 err
= ctnetlink_change_timeout(ct
, cda
);
1089 if (cda
[CTA_STATUS
]) {
1090 err
= ctnetlink_change_status(ct
, cda
);
1095 if (cda
[CTA_PROTOINFO
]) {
1096 err
= ctnetlink_change_protoinfo(ct
, cda
);
1101 #if defined(CONFIG_NF_CONNTRACK_MARK)
1103 ct
->mark
= ntohl(nla_get_be32(cda
[CTA_MARK
]));
1106 #ifdef CONFIG_NF_NAT_NEEDED
1107 if (cda
[CTA_NAT_SEQ_ADJ_ORIG
] || cda
[CTA_NAT_SEQ_ADJ_REPLY
]) {
1108 err
= ctnetlink_change_nat_seq_adj(ct
, cda
);
1118 ctnetlink_create_conntrack(struct nlattr
*cda
[],
1119 struct nf_conntrack_tuple
*otuple
,
1120 struct nf_conntrack_tuple
*rtuple
,
1121 struct nf_conn
*master_ct
)
1125 struct nf_conn_help
*help
;
1126 struct nf_conntrack_helper
*helper
;
1128 ct
= nf_conntrack_alloc(otuple
, rtuple
, GFP_KERNEL
);
1129 if (ct
== NULL
|| IS_ERR(ct
))
1132 if (!cda
[CTA_TIMEOUT
])
1134 ct
->timeout
.expires
= ntohl(nla_get_be32(cda
[CTA_TIMEOUT
]));
1136 ct
->timeout
.expires
= jiffies
+ ct
->timeout
.expires
* HZ
;
1137 ct
->status
|= IPS_CONFIRMED
;
1139 if (cda
[CTA_STATUS
]) {
1140 err
= ctnetlink_change_status(ct
, cda
);
1145 if (cda
[CTA_PROTOINFO
]) {
1146 err
= ctnetlink_change_protoinfo(ct
, cda
);
1151 nf_ct_acct_ext_add(ct
, GFP_KERNEL
);
1153 #if defined(CONFIG_NF_CONNTRACK_MARK)
1155 ct
->mark
= ntohl(nla_get_be32(cda
[CTA_MARK
]));
1159 helper
= __nf_ct_helper_find(rtuple
);
1161 help
= nf_ct_helper_ext_add(ct
, GFP_KERNEL
);
1167 /* not in hash table yet so not strictly necessary */
1168 rcu_assign_pointer(help
->helper
, helper
);
1171 /* setup master conntrack: this is a confirmed expectation */
1173 __set_bit(IPS_EXPECTED_BIT
, &ct
->status
);
1174 ct
->master
= master_ct
;
1177 add_timer(&ct
->timeout
);
1178 nf_conntrack_hash_insert(ct
);
1184 nf_conntrack_free(ct
);
1189 ctnetlink_new_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
1190 struct nlmsghdr
*nlh
, struct nlattr
*cda
[])
1192 struct nf_conntrack_tuple otuple
, rtuple
;
1193 struct nf_conntrack_tuple_hash
*h
= NULL
;
1194 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1195 u_int8_t u3
= nfmsg
->nfgen_family
;
1198 if (cda
[CTA_TUPLE_ORIG
]) {
1199 err
= ctnetlink_parse_tuple(cda
, &otuple
, CTA_TUPLE_ORIG
, u3
);
1204 if (cda
[CTA_TUPLE_REPLY
]) {
1205 err
= ctnetlink_parse_tuple(cda
, &rtuple
, CTA_TUPLE_REPLY
, u3
);
1210 spin_lock_bh(&nf_conntrack_lock
);
1211 if (cda
[CTA_TUPLE_ORIG
])
1212 h
= __nf_conntrack_find(&otuple
);
1213 else if (cda
[CTA_TUPLE_REPLY
])
1214 h
= __nf_conntrack_find(&rtuple
);
1217 struct nf_conntrack_tuple master
;
1218 struct nf_conntrack_tuple_hash
*master_h
= NULL
;
1219 struct nf_conn
*master_ct
= NULL
;
1221 if (cda
[CTA_TUPLE_MASTER
]) {
1222 err
= ctnetlink_parse_tuple(cda
,
1229 master_h
= __nf_conntrack_find(&master
);
1230 if (master_h
== NULL
) {
1234 master_ct
= nf_ct_tuplehash_to_ctrack(master_h
);
1235 atomic_inc(&master_ct
->ct_general
.use
);
1238 spin_unlock_bh(&nf_conntrack_lock
);
1240 if (nlh
->nlmsg_flags
& NLM_F_CREATE
)
1241 err
= ctnetlink_create_conntrack(cda
,
1245 if (err
< 0 && master_ct
)
1246 nf_ct_put(master_ct
);
1250 /* implicit 'else' */
1252 /* We manipulate the conntrack inside the global conntrack table lock,
1253 * so there's no need to increase the refcount */
1255 if (!(nlh
->nlmsg_flags
& NLM_F_EXCL
)) {
1256 /* we only allow nat config for new conntracks */
1257 if (cda
[CTA_NAT_SRC
] || cda
[CTA_NAT_DST
]) {
1261 /* can't link an existing conntrack to a master */
1262 if (cda
[CTA_TUPLE_MASTER
]) {
1266 err
= ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h
),
1271 spin_unlock_bh(&nf_conntrack_lock
);
1275 /***********************************************************************
1277 ***********************************************************************/
1280 ctnetlink_exp_dump_tuple(struct sk_buff
*skb
,
1281 const struct nf_conntrack_tuple
*tuple
,
1282 enum ctattr_expect type
)
1284 struct nlattr
*nest_parms
;
1286 nest_parms
= nla_nest_start(skb
, type
| NLA_F_NESTED
);
1288 goto nla_put_failure
;
1289 if (ctnetlink_dump_tuples(skb
, tuple
) < 0)
1290 goto nla_put_failure
;
1291 nla_nest_end(skb
, nest_parms
);
1300 ctnetlink_exp_dump_mask(struct sk_buff
*skb
,
1301 const struct nf_conntrack_tuple
*tuple
,
1302 const struct nf_conntrack_tuple_mask
*mask
)
1305 struct nf_conntrack_l3proto
*l3proto
;
1306 struct nf_conntrack_l4proto
*l4proto
;
1307 struct nf_conntrack_tuple m
;
1308 struct nlattr
*nest_parms
;
1310 memset(&m
, 0xFF, sizeof(m
));
1311 m
.src
.u
.all
= mask
->src
.u
.all
;
1312 memcpy(&m
.src
.u3
, &mask
->src
.u3
, sizeof(m
.src
.u3
));
1314 nest_parms
= nla_nest_start(skb
, CTA_EXPECT_MASK
| NLA_F_NESTED
);
1316 goto nla_put_failure
;
1318 l3proto
= nf_ct_l3proto_find_get(tuple
->src
.l3num
);
1319 ret
= ctnetlink_dump_tuples_ip(skb
, &m
, l3proto
);
1320 nf_ct_l3proto_put(l3proto
);
1322 if (unlikely(ret
< 0))
1323 goto nla_put_failure
;
1325 l4proto
= nf_ct_l4proto_find_get(tuple
->src
.l3num
, tuple
->dst
.protonum
);
1326 ret
= ctnetlink_dump_tuples_proto(skb
, &m
, l4proto
);
1327 nf_ct_l4proto_put(l4proto
);
1328 if (unlikely(ret
< 0))
1329 goto nla_put_failure
;
1331 nla_nest_end(skb
, nest_parms
);
1340 ctnetlink_exp_dump_expect(struct sk_buff
*skb
,
1341 const struct nf_conntrack_expect
*exp
)
1343 struct nf_conn
*master
= exp
->master
;
1344 long timeout
= (exp
->timeout
.expires
- jiffies
) / HZ
;
1349 if (ctnetlink_exp_dump_tuple(skb
, &exp
->tuple
, CTA_EXPECT_TUPLE
) < 0)
1350 goto nla_put_failure
;
1351 if (ctnetlink_exp_dump_mask(skb
, &exp
->tuple
, &exp
->mask
) < 0)
1352 goto nla_put_failure
;
1353 if (ctnetlink_exp_dump_tuple(skb
,
1354 &master
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
,
1355 CTA_EXPECT_MASTER
) < 0)
1356 goto nla_put_failure
;
1358 NLA_PUT_BE32(skb
, CTA_EXPECT_TIMEOUT
, htonl(timeout
));
1359 NLA_PUT_BE32(skb
, CTA_EXPECT_ID
, htonl((unsigned long)exp
));
1368 ctnetlink_exp_fill_info(struct sk_buff
*skb
, u32 pid
, u32 seq
,
1371 const struct nf_conntrack_expect
*exp
)
1373 struct nlmsghdr
*nlh
;
1374 struct nfgenmsg
*nfmsg
;
1375 unsigned char *b
= skb_tail_pointer(skb
);
1377 event
|= NFNL_SUBSYS_CTNETLINK_EXP
<< 8;
1378 nlh
= NLMSG_PUT(skb
, pid
, seq
, event
, sizeof(struct nfgenmsg
));
1379 nfmsg
= NLMSG_DATA(nlh
);
1381 nlh
->nlmsg_flags
= (nowait
&& pid
) ? NLM_F_MULTI
: 0;
1382 nfmsg
->nfgen_family
= exp
->tuple
.src
.l3num
;
1383 nfmsg
->version
= NFNETLINK_V0
;
1386 if (ctnetlink_exp_dump_expect(skb
, exp
) < 0)
1387 goto nla_put_failure
;
1389 nlh
->nlmsg_len
= skb_tail_pointer(skb
) - b
;
1398 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1399 static int ctnetlink_expect_event(struct notifier_block
*this,
1400 unsigned long events
, void *ptr
)
1402 struct nlmsghdr
*nlh
;
1403 struct nfgenmsg
*nfmsg
;
1404 struct nf_conntrack_expect
*exp
= (struct nf_conntrack_expect
*)ptr
;
1405 struct sk_buff
*skb
;
1410 if (events
& IPEXP_NEW
) {
1411 type
= IPCTNL_MSG_EXP_NEW
;
1412 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
1416 if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW
))
1419 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_ATOMIC
);
1425 type
|= NFNL_SUBSYS_CTNETLINK_EXP
<< 8;
1426 nlh
= NLMSG_PUT(skb
, 0, 0, type
, sizeof(struct nfgenmsg
));
1427 nfmsg
= NLMSG_DATA(nlh
);
1429 nlh
->nlmsg_flags
= flags
;
1430 nfmsg
->nfgen_family
= exp
->tuple
.src
.l3num
;
1431 nfmsg
->version
= NFNETLINK_V0
;
1434 if (ctnetlink_exp_dump_expect(skb
, exp
) < 0)
1435 goto nla_put_failure
;
1437 nlh
->nlmsg_len
= skb
->tail
- b
;
1438 nfnetlink_send(skb
, 0, NFNLGRP_CONNTRACK_EXP_NEW
, 0);
1447 static int ctnetlink_exp_done(struct netlink_callback
*cb
)
1450 nf_ct_expect_put((struct nf_conntrack_expect
*)cb
->args
[1]);
1455 ctnetlink_exp_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1457 struct nf_conntrack_expect
*exp
, *last
;
1458 struct nfgenmsg
*nfmsg
= NLMSG_DATA(cb
->nlh
);
1459 struct hlist_node
*n
;
1460 u_int8_t l3proto
= nfmsg
->nfgen_family
;
1463 last
= (struct nf_conntrack_expect
*)cb
->args
[1];
1464 for (; cb
->args
[0] < nf_ct_expect_hsize
; cb
->args
[0]++) {
1466 hlist_for_each_entry(exp
, n
, &nf_ct_expect_hash
[cb
->args
[0]],
1468 if (l3proto
&& exp
->tuple
.src
.l3num
!= l3proto
)
1475 if (ctnetlink_exp_fill_info(skb
, NETLINK_CB(cb
->skb
).pid
,
1479 if (!atomic_inc_not_zero(&exp
->use
))
1481 cb
->args
[1] = (unsigned long)exp
;
1493 nf_ct_expect_put(last
);
1498 static const struct nla_policy exp_nla_policy
[CTA_EXPECT_MAX
+1] = {
1499 [CTA_EXPECT_TIMEOUT
] = { .type
= NLA_U32
},
1500 [CTA_EXPECT_ID
] = { .type
= NLA_U32
},
1504 ctnetlink_get_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1505 struct nlmsghdr
*nlh
, struct nlattr
*cda
[])
1507 struct nf_conntrack_tuple tuple
;
1508 struct nf_conntrack_expect
*exp
;
1509 struct sk_buff
*skb2
;
1510 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1511 u_int8_t u3
= nfmsg
->nfgen_family
;
1514 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1515 return netlink_dump_start(ctnl
, skb
, nlh
,
1516 ctnetlink_exp_dump_table
,
1517 ctnetlink_exp_done
);
1520 if (cda
[CTA_EXPECT_MASTER
])
1521 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_MASTER
, u3
);
1528 exp
= nf_ct_expect_find_get(&tuple
);
1532 if (cda
[CTA_EXPECT_ID
]) {
1533 __be32 id
= nla_get_be32(cda
[CTA_EXPECT_ID
]);
1534 if (ntohl(id
) != (u32
)(unsigned long)exp
) {
1535 nf_ct_expect_put(exp
);
1541 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1545 err
= ctnetlink_exp_fill_info(skb2
, NETLINK_CB(skb
).pid
,
1546 nlh
->nlmsg_seq
, IPCTNL_MSG_EXP_NEW
,
1551 nf_ct_expect_put(exp
);
1553 return netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).pid
, MSG_DONTWAIT
);
1558 nf_ct_expect_put(exp
);
1563 ctnetlink_del_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1564 struct nlmsghdr
*nlh
, struct nlattr
*cda
[])
1566 struct nf_conntrack_expect
*exp
;
1567 struct nf_conntrack_tuple tuple
;
1568 struct nf_conntrack_helper
*h
;
1569 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1570 struct hlist_node
*n
, *next
;
1571 u_int8_t u3
= nfmsg
->nfgen_family
;
1575 if (cda
[CTA_EXPECT_TUPLE
]) {
1576 /* delete a single expect by tuple */
1577 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
, u3
);
1581 /* bump usage count to 2 */
1582 exp
= nf_ct_expect_find_get(&tuple
);
1586 if (cda
[CTA_EXPECT_ID
]) {
1587 __be32 id
= nla_get_be32(cda
[CTA_EXPECT_ID
]);
1588 if (ntohl(id
) != (u32
)(unsigned long)exp
) {
1589 nf_ct_expect_put(exp
);
1594 /* after list removal, usage count == 1 */
1595 nf_ct_unexpect_related(exp
);
1596 /* have to put what we 'get' above.
1597 * after this line usage count == 0 */
1598 nf_ct_expect_put(exp
);
1599 } else if (cda
[CTA_EXPECT_HELP_NAME
]) {
1600 char *name
= nla_data(cda
[CTA_EXPECT_HELP_NAME
]);
1601 struct nf_conn_help
*m_help
;
1603 /* delete all expectations for this helper */
1604 spin_lock_bh(&nf_conntrack_lock
);
1605 h
= __nf_conntrack_helper_find_byname(name
);
1607 spin_unlock_bh(&nf_conntrack_lock
);
1610 for (i
= 0; i
< nf_ct_expect_hsize
; i
++) {
1611 hlist_for_each_entry_safe(exp
, n
, next
,
1612 &nf_ct_expect_hash
[i
],
1614 m_help
= nfct_help(exp
->master
);
1615 if (m_help
->helper
== h
1616 && del_timer(&exp
->timeout
)) {
1617 nf_ct_unlink_expect(exp
);
1618 nf_ct_expect_put(exp
);
1622 spin_unlock_bh(&nf_conntrack_lock
);
1624 /* This basically means we have to flush everything*/
1625 spin_lock_bh(&nf_conntrack_lock
);
1626 for (i
= 0; i
< nf_ct_expect_hsize
; i
++) {
1627 hlist_for_each_entry_safe(exp
, n
, next
,
1628 &nf_ct_expect_hash
[i
],
1630 if (del_timer(&exp
->timeout
)) {
1631 nf_ct_unlink_expect(exp
);
1632 nf_ct_expect_put(exp
);
1636 spin_unlock_bh(&nf_conntrack_lock
);
1642 ctnetlink_change_expect(struct nf_conntrack_expect
*x
, struct nlattr
*cda
[])
1648 ctnetlink_create_expect(struct nlattr
*cda
[], u_int8_t u3
)
1650 struct nf_conntrack_tuple tuple
, mask
, master_tuple
;
1651 struct nf_conntrack_tuple_hash
*h
= NULL
;
1652 struct nf_conntrack_expect
*exp
;
1654 struct nf_conn_help
*help
;
1657 /* caller guarantees that those three CTA_EXPECT_* exist */
1658 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
, u3
);
1661 err
= ctnetlink_parse_tuple(cda
, &mask
, CTA_EXPECT_MASK
, u3
);
1664 err
= ctnetlink_parse_tuple(cda
, &master_tuple
, CTA_EXPECT_MASTER
, u3
);
1668 /* Look for master conntrack of this expectation */
1669 h
= nf_conntrack_find_get(&master_tuple
);
1672 ct
= nf_ct_tuplehash_to_ctrack(h
);
1673 help
= nfct_help(ct
);
1675 if (!help
|| !help
->helper
) {
1676 /* such conntrack hasn't got any helper, abort */
1681 exp
= nf_ct_expect_alloc(ct
);
1687 exp
->expectfn
= NULL
;
1691 memcpy(&exp
->tuple
, &tuple
, sizeof(struct nf_conntrack_tuple
));
1692 memcpy(&exp
->mask
.src
.u3
, &mask
.src
.u3
, sizeof(exp
->mask
.src
.u3
));
1693 exp
->mask
.src
.u
.all
= mask
.src
.u
.all
;
1695 err
= nf_ct_expect_related(exp
);
1696 nf_ct_expect_put(exp
);
1699 nf_ct_put(nf_ct_tuplehash_to_ctrack(h
));
1704 ctnetlink_new_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1705 struct nlmsghdr
*nlh
, struct nlattr
*cda
[])
1707 struct nf_conntrack_tuple tuple
;
1708 struct nf_conntrack_expect
*exp
;
1709 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
1710 u_int8_t u3
= nfmsg
->nfgen_family
;
1713 if (!cda
[CTA_EXPECT_TUPLE
]
1714 || !cda
[CTA_EXPECT_MASK
]
1715 || !cda
[CTA_EXPECT_MASTER
])
1718 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
, u3
);
1722 spin_lock_bh(&nf_conntrack_lock
);
1723 exp
= __nf_ct_expect_find(&tuple
);
1726 spin_unlock_bh(&nf_conntrack_lock
);
1728 if (nlh
->nlmsg_flags
& NLM_F_CREATE
)
1729 err
= ctnetlink_create_expect(cda
, u3
);
1734 if (!(nlh
->nlmsg_flags
& NLM_F_EXCL
))
1735 err
= ctnetlink_change_expect(exp
, cda
);
1736 spin_unlock_bh(&nf_conntrack_lock
);
1741 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1742 static struct notifier_block ctnl_notifier
= {
1743 .notifier_call
= ctnetlink_conntrack_event
,
1746 static struct notifier_block ctnl_notifier_exp
= {
1747 .notifier_call
= ctnetlink_expect_event
,
1751 static const struct nfnl_callback ctnl_cb
[IPCTNL_MSG_MAX
] = {
1752 [IPCTNL_MSG_CT_NEW
] = { .call
= ctnetlink_new_conntrack
,
1753 .attr_count
= CTA_MAX
,
1754 .policy
= ct_nla_policy
},
1755 [IPCTNL_MSG_CT_GET
] = { .call
= ctnetlink_get_conntrack
,
1756 .attr_count
= CTA_MAX
,
1757 .policy
= ct_nla_policy
},
1758 [IPCTNL_MSG_CT_DELETE
] = { .call
= ctnetlink_del_conntrack
,
1759 .attr_count
= CTA_MAX
,
1760 .policy
= ct_nla_policy
},
1761 [IPCTNL_MSG_CT_GET_CTRZERO
] = { .call
= ctnetlink_get_conntrack
,
1762 .attr_count
= CTA_MAX
,
1763 .policy
= ct_nla_policy
},
1766 static const struct nfnl_callback ctnl_exp_cb
[IPCTNL_MSG_EXP_MAX
] = {
1767 [IPCTNL_MSG_EXP_GET
] = { .call
= ctnetlink_get_expect
,
1768 .attr_count
= CTA_EXPECT_MAX
,
1769 .policy
= exp_nla_policy
},
1770 [IPCTNL_MSG_EXP_NEW
] = { .call
= ctnetlink_new_expect
,
1771 .attr_count
= CTA_EXPECT_MAX
,
1772 .policy
= exp_nla_policy
},
1773 [IPCTNL_MSG_EXP_DELETE
] = { .call
= ctnetlink_del_expect
,
1774 .attr_count
= CTA_EXPECT_MAX
,
1775 .policy
= exp_nla_policy
},
1778 static const struct nfnetlink_subsystem ctnl_subsys
= {
1779 .name
= "conntrack",
1780 .subsys_id
= NFNL_SUBSYS_CTNETLINK
,
1781 .cb_count
= IPCTNL_MSG_MAX
,
1785 static const struct nfnetlink_subsystem ctnl_exp_subsys
= {
1786 .name
= "conntrack_expect",
1787 .subsys_id
= NFNL_SUBSYS_CTNETLINK_EXP
,
1788 .cb_count
= IPCTNL_MSG_EXP_MAX
,
1792 MODULE_ALIAS("ip_conntrack_netlink");
1793 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK
);
1794 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP
);
1796 static int __init
ctnetlink_init(void)
1800 printk("ctnetlink v%s: registering with nfnetlink.\n", version
);
1801 ret
= nfnetlink_subsys_register(&ctnl_subsys
);
1803 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1807 ret
= nfnetlink_subsys_register(&ctnl_exp_subsys
);
1809 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1810 goto err_unreg_subsys
;
1813 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1814 ret
= nf_conntrack_register_notifier(&ctnl_notifier
);
1816 printk("ctnetlink_init: cannot register notifier.\n");
1817 goto err_unreg_exp_subsys
;
1820 ret
= nf_ct_expect_register_notifier(&ctnl_notifier_exp
);
1822 printk("ctnetlink_init: cannot expect register notifier.\n");
1823 goto err_unreg_notifier
;
1829 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1831 nf_conntrack_unregister_notifier(&ctnl_notifier
);
1832 err_unreg_exp_subsys
:
1833 nfnetlink_subsys_unregister(&ctnl_exp_subsys
);
1836 nfnetlink_subsys_unregister(&ctnl_subsys
);
1841 static void __exit
ctnetlink_exit(void)
1843 printk("ctnetlink: unregistering from nfnetlink.\n");
1845 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1846 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp
);
1847 nf_conntrack_unregister_notifier(&ctnl_notifier
);
1850 nfnetlink_subsys_unregister(&ctnl_exp_subsys
);
1851 nfnetlink_subsys_unregister(&ctnl_subsys
);
1855 module_init(ctnetlink_init
);
1856 module_exit(ctnetlink_exit
);