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) 2005-2007 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/types.h>
22 #include <linux/timer.h>
23 #include <linux/skbuff.h>
24 #include <linux/errno.h>
25 #include <linux/netlink.h>
26 #include <linux/spinlock.h>
27 #include <linux/interrupt.h>
28 #include <linux/notifier.h>
30 #include <linux/netfilter.h>
31 #include <net/netlink.h>
32 #include <net/netfilter/nf_conntrack.h>
33 #include <net/netfilter/nf_conntrack_core.h>
34 #include <net/netfilter/nf_conntrack_expect.h>
35 #include <net/netfilter/nf_conntrack_helper.h>
36 #include <net/netfilter/nf_conntrack_l3proto.h>
37 #include <net/netfilter/nf_conntrack_l4proto.h>
38 #include <net/netfilter/nf_conntrack_tuple.h>
39 #ifdef CONFIG_NF_NAT_NEEDED
40 #include <net/netfilter/nf_nat_core.h>
41 #include <net/netfilter/nf_nat_protocol.h>
44 #include <linux/netfilter/nfnetlink.h>
45 #include <linux/netfilter/nfnetlink_conntrack.h>
47 MODULE_LICENSE("GPL");
49 static char __initdata version
[] = "0.93";
52 ctnetlink_dump_tuples_proto(struct sk_buff
*skb
,
53 const struct nf_conntrack_tuple
*tuple
,
54 struct nf_conntrack_l4proto
*l4proto
)
57 struct nlattr
*nest_parms
;
59 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_PROTO
| NLA_F_NESTED
);
62 NLA_PUT_U8(skb
, CTA_PROTO_NUM
, tuple
->dst
.protonum
);
64 if (likely(l4proto
->tuple_to_nlattr
))
65 ret
= l4proto
->tuple_to_nlattr(skb
, tuple
);
67 nla_nest_end(skb
, nest_parms
);
76 ctnetlink_dump_tuples_ip(struct sk_buff
*skb
,
77 const struct nf_conntrack_tuple
*tuple
,
78 struct nf_conntrack_l3proto
*l3proto
)
81 struct nlattr
*nest_parms
;
83 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_IP
| NLA_F_NESTED
);
87 if (likely(l3proto
->tuple_to_nlattr
))
88 ret
= l3proto
->tuple_to_nlattr(skb
, tuple
);
90 nla_nest_end(skb
, nest_parms
);
99 ctnetlink_dump_tuples(struct sk_buff
*skb
,
100 const struct nf_conntrack_tuple
*tuple
)
103 struct nf_conntrack_l3proto
*l3proto
;
104 struct nf_conntrack_l4proto
*l4proto
;
106 l3proto
= nf_ct_l3proto_find_get(tuple
->src
.l3num
);
107 ret
= ctnetlink_dump_tuples_ip(skb
, tuple
, l3proto
);
108 nf_ct_l3proto_put(l3proto
);
110 if (unlikely(ret
< 0))
113 l4proto
= nf_ct_l4proto_find_get(tuple
->src
.l3num
, tuple
->dst
.protonum
);
114 ret
= ctnetlink_dump_tuples_proto(skb
, tuple
, l4proto
);
115 nf_ct_l4proto_put(l4proto
);
121 ctnetlink_dump_status(struct sk_buff
*skb
, const struct nf_conn
*ct
)
123 NLA_PUT_BE32(skb
, CTA_STATUS
, htonl(ct
->status
));
131 ctnetlink_dump_timeout(struct sk_buff
*skb
, const struct nf_conn
*ct
)
133 long timeout
= (ct
->timeout
.expires
- jiffies
) / HZ
;
138 NLA_PUT_BE32(skb
, CTA_TIMEOUT
, htonl(timeout
));
146 ctnetlink_dump_protoinfo(struct sk_buff
*skb
, const struct nf_conn
*ct
)
148 struct nf_conntrack_l4proto
*l4proto
;
149 struct nlattr
*nest_proto
;
152 l4proto
= nf_ct_l4proto_find_get(nf_ct_l3num(ct
), nf_ct_protonum(ct
));
153 if (!l4proto
->to_nlattr
) {
154 nf_ct_l4proto_put(l4proto
);
158 nest_proto
= nla_nest_start(skb
, CTA_PROTOINFO
| NLA_F_NESTED
);
160 goto nla_put_failure
;
162 ret
= l4proto
->to_nlattr(skb
, nest_proto
, ct
);
164 nf_ct_l4proto_put(l4proto
);
166 nla_nest_end(skb
, nest_proto
);
171 nf_ct_l4proto_put(l4proto
);
176 ctnetlink_dump_helpinfo(struct sk_buff
*skb
, const struct nf_conn
*ct
)
178 struct nlattr
*nest_helper
;
179 const struct nf_conn_help
*help
= nfct_help(ct
);
180 struct nf_conntrack_helper
*helper
;
186 helper
= rcu_dereference(help
->helper
);
190 nest_helper
= nla_nest_start(skb
, CTA_HELP
| NLA_F_NESTED
);
192 goto nla_put_failure
;
193 NLA_PUT_STRING(skb
, CTA_HELP_NAME
, helper
->name
);
195 if (helper
->to_nlattr
)
196 helper
->to_nlattr(skb
, ct
);
198 nla_nest_end(skb
, nest_helper
);
208 #ifdef CONFIG_NF_CT_ACCT
210 ctnetlink_dump_counters(struct sk_buff
*skb
, const struct nf_conn
*ct
,
211 enum ip_conntrack_dir dir
)
213 enum ctattr_type type
= dir
? CTA_COUNTERS_REPLY
: CTA_COUNTERS_ORIG
;
214 struct nlattr
*nest_count
;
216 nest_count
= nla_nest_start(skb
, type
| NLA_F_NESTED
);
218 goto nla_put_failure
;
220 NLA_PUT_BE32(skb
, CTA_COUNTERS32_PACKETS
,
221 htonl(ct
->counters
[dir
].packets
));
222 NLA_PUT_BE32(skb
, CTA_COUNTERS32_BYTES
,
223 htonl(ct
->counters
[dir
].bytes
));
225 nla_nest_end(skb
, nest_count
);
233 #define ctnetlink_dump_counters(a, b, c) (0)
236 #ifdef CONFIG_NF_CONNTRACK_MARK
238 ctnetlink_dump_mark(struct sk_buff
*skb
, const struct nf_conn
*ct
)
240 NLA_PUT_BE32(skb
, CTA_MARK
, htonl(ct
->mark
));
247 #define ctnetlink_dump_mark(a, b) (0)
250 #ifdef CONFIG_NF_CONNTRACK_SECMARK
252 ctnetlink_dump_secmark(struct sk_buff
*skb
, const struct nf_conn
*ct
)
254 NLA_PUT_BE32(skb
, CTA_SECMARK
, htonl(ct
->secmark
));
261 #define ctnetlink_dump_secmark(a, b) (0)
264 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
267 ctnetlink_dump_master(struct sk_buff
*skb
, const struct nf_conn
*ct
)
269 struct nlattr
*nest_parms
;
271 if (!(ct
->status
& IPS_EXPECTED
))
274 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_MASTER
| NLA_F_NESTED
);
276 goto nla_put_failure
;
277 if (ctnetlink_dump_tuples(skb
, master_tuple(ct
)) < 0)
278 goto nla_put_failure
;
279 nla_nest_end(skb
, nest_parms
);
287 #ifdef CONFIG_NF_NAT_NEEDED
289 dump_nat_seq_adj(struct sk_buff
*skb
, const struct nf_nat_seq
*natseq
, int type
)
291 struct nlattr
*nest_parms
;
293 nest_parms
= nla_nest_start(skb
, type
| NLA_F_NESTED
);
295 goto nla_put_failure
;
297 NLA_PUT_BE32(skb
, CTA_NAT_SEQ_CORRECTION_POS
,
298 htonl(natseq
->correction_pos
));
299 NLA_PUT_BE32(skb
, CTA_NAT_SEQ_OFFSET_BEFORE
,
300 htonl(natseq
->offset_before
));
301 NLA_PUT_BE32(skb
, CTA_NAT_SEQ_OFFSET_AFTER
,
302 htonl(natseq
->offset_after
));
304 nla_nest_end(skb
, nest_parms
);
313 ctnetlink_dump_nat_seq_adj(struct sk_buff
*skb
, const struct nf_conn
*ct
)
315 struct nf_nat_seq
*natseq
;
316 struct nf_conn_nat
*nat
= nfct_nat(ct
);
318 if (!(ct
->status
& IPS_SEQ_ADJUST
) || !nat
)
321 natseq
= &nat
->seq
[IP_CT_DIR_ORIGINAL
];
322 if (dump_nat_seq_adj(skb
, natseq
, CTA_NAT_SEQ_ADJ_ORIG
) == -1)
325 natseq
= &nat
->seq
[IP_CT_DIR_REPLY
];
326 if (dump_nat_seq_adj(skb
, natseq
, CTA_NAT_SEQ_ADJ_REPLY
) == -1)
332 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
336 ctnetlink_dump_id(struct sk_buff
*skb
, const struct nf_conn
*ct
)
338 NLA_PUT_BE32(skb
, CTA_ID
, htonl((unsigned long)ct
));
346 ctnetlink_dump_use(struct sk_buff
*skb
, const struct nf_conn
*ct
)
348 NLA_PUT_BE32(skb
, CTA_USE
, htonl(atomic_read(&ct
->ct_general
.use
)));
355 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
358 ctnetlink_fill_info(struct sk_buff
*skb
, u32 pid
, u32 seq
,
359 int event
, int nowait
,
360 const struct nf_conn
*ct
)
362 struct nlmsghdr
*nlh
;
363 struct nfgenmsg
*nfmsg
;
364 struct nlattr
*nest_parms
;
365 unsigned char *b
= skb_tail_pointer(skb
);
367 event
|= NFNL_SUBSYS_CTNETLINK
<< 8;
368 nlh
= NLMSG_PUT(skb
, pid
, seq
, event
, sizeof(struct nfgenmsg
));
369 nfmsg
= NLMSG_DATA(nlh
);
371 nlh
->nlmsg_flags
= (nowait
&& pid
) ? NLM_F_MULTI
: 0;
372 nfmsg
->nfgen_family
= nf_ct_l3num(ct
);
373 nfmsg
->version
= NFNETLINK_V0
;
376 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_ORIG
| NLA_F_NESTED
);
378 goto nla_put_failure
;
379 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
380 goto nla_put_failure
;
381 nla_nest_end(skb
, nest_parms
);
383 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_REPLY
| NLA_F_NESTED
);
385 goto nla_put_failure
;
386 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
387 goto nla_put_failure
;
388 nla_nest_end(skb
, nest_parms
);
390 if (ctnetlink_dump_status(skb
, ct
) < 0 ||
391 ctnetlink_dump_timeout(skb
, ct
) < 0 ||
392 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
393 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0 ||
394 ctnetlink_dump_protoinfo(skb
, ct
) < 0 ||
395 ctnetlink_dump_helpinfo(skb
, ct
) < 0 ||
396 ctnetlink_dump_mark(skb
, ct
) < 0 ||
397 ctnetlink_dump_secmark(skb
, ct
) < 0 ||
398 ctnetlink_dump_id(skb
, ct
) < 0 ||
399 ctnetlink_dump_use(skb
, ct
) < 0 ||
400 ctnetlink_dump_master(skb
, ct
) < 0 ||
401 ctnetlink_dump_nat_seq_adj(skb
, ct
) < 0)
402 goto nla_put_failure
;
404 nlh
->nlmsg_len
= skb_tail_pointer(skb
) - b
;
413 #ifdef CONFIG_NF_CONNTRACK_EVENTS
414 static int ctnetlink_conntrack_event(struct notifier_block
*this,
415 unsigned long events
, void *ptr
)
417 struct nlmsghdr
*nlh
;
418 struct nfgenmsg
*nfmsg
;
419 struct nlattr
*nest_parms
;
420 struct nf_conn
*ct
= (struct nf_conn
*)ptr
;
424 unsigned int flags
= 0, group
;
426 /* ignore our fake conntrack entry */
427 if (ct
== &nf_conntrack_untracked
)
430 if (events
& IPCT_DESTROY
) {
431 type
= IPCTNL_MSG_CT_DELETE
;
432 group
= NFNLGRP_CONNTRACK_DESTROY
;
433 } else if (events
& (IPCT_NEW
| IPCT_RELATED
)) {
434 type
= IPCTNL_MSG_CT_NEW
;
435 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
436 group
= NFNLGRP_CONNTRACK_NEW
;
437 } else if (events
& (IPCT_STATUS
| IPCT_PROTOINFO
)) {
438 type
= IPCTNL_MSG_CT_NEW
;
439 group
= NFNLGRP_CONNTRACK_UPDATE
;
443 if (!nfnetlink_has_listeners(group
))
446 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_ATOMIC
);
452 type
|= NFNL_SUBSYS_CTNETLINK
<< 8;
453 nlh
= NLMSG_PUT(skb
, 0, 0, type
, sizeof(struct nfgenmsg
));
454 nfmsg
= NLMSG_DATA(nlh
);
456 nlh
->nlmsg_flags
= flags
;
457 nfmsg
->nfgen_family
= nf_ct_l3num(ct
);
458 nfmsg
->version
= NFNETLINK_V0
;
461 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_ORIG
| NLA_F_NESTED
);
463 goto nla_put_failure
;
464 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
465 goto nla_put_failure
;
466 nla_nest_end(skb
, nest_parms
);
468 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_REPLY
| NLA_F_NESTED
);
470 goto nla_put_failure
;
471 if (ctnetlink_dump_tuples(skb
, tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
472 goto nla_put_failure
;
473 nla_nest_end(skb
, nest_parms
);
475 if (events
& IPCT_DESTROY
) {
476 if (ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
477 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0)
478 goto nla_put_failure
;
480 if (ctnetlink_dump_status(skb
, ct
) < 0)
481 goto nla_put_failure
;
483 if (ctnetlink_dump_timeout(skb
, ct
) < 0)
484 goto nla_put_failure
;
486 if (events
& IPCT_PROTOINFO
487 && ctnetlink_dump_protoinfo(skb
, ct
) < 0)
488 goto nla_put_failure
;
490 if ((events
& IPCT_HELPER
|| nfct_help(ct
))
491 && ctnetlink_dump_helpinfo(skb
, ct
) < 0)
492 goto nla_put_failure
;
494 #ifdef CONFIG_NF_CONNTRACK_SECMARK
495 if ((events
& IPCT_SECMARK
|| ct
->secmark
)
496 && ctnetlink_dump_secmark(skb
, ct
) < 0)
497 goto nla_put_failure
;
500 if (events
& IPCT_COUNTER_FILLING
&&
501 (ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
502 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0))
503 goto nla_put_failure
;
505 if (events
& IPCT_RELATED
&&
506 ctnetlink_dump_master(skb
, ct
) < 0)
507 goto nla_put_failure
;
509 if (events
& IPCT_NATSEQADJ
&&
510 ctnetlink_dump_nat_seq_adj(skb
, ct
) < 0)
511 goto nla_put_failure
;
514 #ifdef CONFIG_NF_CONNTRACK_MARK
515 if ((events
& IPCT_MARK
|| ct
->mark
)
516 && ctnetlink_dump_mark(skb
, ct
) < 0)
517 goto nla_put_failure
;
520 nlh
->nlmsg_len
= skb
->tail
- b
;
521 nfnetlink_send(skb
, 0, group
, 0);
529 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
531 static int ctnetlink_done(struct netlink_callback
*cb
)
534 nf_ct_put((struct nf_conn
*)cb
->args
[1]);
539 ctnetlink_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
541 struct nf_conn
*ct
, *last
;
542 struct nf_conntrack_tuple_hash
*h
;
543 struct hlist_node
*n
;
544 struct nfgenmsg
*nfmsg
= NLMSG_DATA(cb
->nlh
);
545 u_int8_t l3proto
= nfmsg
->nfgen_family
;
548 last
= (struct nf_conn
*)cb
->args
[1];
549 for (; cb
->args
[0] < nf_conntrack_htable_size
; cb
->args
[0]++) {
551 hlist_for_each_entry_rcu(h
, n
, &nf_conntrack_hash
[cb
->args
[0]],
553 if (NF_CT_DIRECTION(h
) != IP_CT_DIR_ORIGINAL
)
555 ct
= nf_ct_tuplehash_to_ctrack(h
);
556 /* Dump entries of a given L3 protocol number.
557 * If it is not specified, ie. l3proto == 0,
558 * then dump everything. */
559 if (l3proto
&& nf_ct_l3num(ct
) != l3proto
)
566 if (ctnetlink_fill_info(skb
, NETLINK_CB(cb
->skb
).pid
,
570 if (!atomic_inc_not_zero(&ct
->ct_general
.use
))
572 cb
->args
[1] = (unsigned long)ct
;
575 #ifdef CONFIG_NF_CT_ACCT
576 if (NFNL_MSG_TYPE(cb
->nlh
->nlmsg_type
) ==
577 IPCTNL_MSG_CT_GET_CTRZERO
)
578 memset(&ct
->counters
, 0, sizeof(ct
->counters
));
595 ctnetlink_parse_tuple_ip(struct nlattr
*attr
, struct nf_conntrack_tuple
*tuple
)
597 struct nlattr
*tb
[CTA_IP_MAX
+1];
598 struct nf_conntrack_l3proto
*l3proto
;
601 nla_parse_nested(tb
, CTA_IP_MAX
, attr
, NULL
);
603 l3proto
= nf_ct_l3proto_find_get(tuple
->src
.l3num
);
605 if (likely(l3proto
->nlattr_to_tuple
)) {
606 ret
= nla_validate_nested(attr
, CTA_IP_MAX
,
607 l3proto
->nla_policy
);
609 ret
= l3proto
->nlattr_to_tuple(tb
, tuple
);
612 nf_ct_l3proto_put(l3proto
);
617 static const struct nla_policy proto_nla_policy
[CTA_PROTO_MAX
+1] = {
618 [CTA_PROTO_NUM
] = { .type
= NLA_U8
},
622 ctnetlink_parse_tuple_proto(struct nlattr
*attr
,
623 struct nf_conntrack_tuple
*tuple
)
625 struct nlattr
*tb
[CTA_PROTO_MAX
+1];
626 struct nf_conntrack_l4proto
*l4proto
;
629 ret
= nla_parse_nested(tb
, CTA_PROTO_MAX
, attr
, proto_nla_policy
);
633 if (!tb
[CTA_PROTO_NUM
])
635 tuple
->dst
.protonum
= nla_get_u8(tb
[CTA_PROTO_NUM
]);
637 l4proto
= nf_ct_l4proto_find_get(tuple
->src
.l3num
, tuple
->dst
.protonum
);
639 if (likely(l4proto
->nlattr_to_tuple
)) {
640 ret
= nla_validate_nested(attr
, CTA_PROTO_MAX
,
641 l4proto
->nla_policy
);
643 ret
= l4proto
->nlattr_to_tuple(tb
, tuple
);
646 nf_ct_l4proto_put(l4proto
);
652 ctnetlink_parse_tuple(struct nlattr
*cda
[], struct nf_conntrack_tuple
*tuple
,
653 enum ctattr_tuple type
, u_int8_t l3num
)
655 struct nlattr
*tb
[CTA_TUPLE_MAX
+1];
658 memset(tuple
, 0, sizeof(*tuple
));
660 nla_parse_nested(tb
, CTA_TUPLE_MAX
, cda
[type
], NULL
);
662 if (!tb
[CTA_TUPLE_IP
])
665 tuple
->src
.l3num
= l3num
;
667 err
= ctnetlink_parse_tuple_ip(tb
[CTA_TUPLE_IP
], tuple
);
671 if (!tb
[CTA_TUPLE_PROTO
])
674 err
= ctnetlink_parse_tuple_proto(tb
[CTA_TUPLE_PROTO
], tuple
);
678 /* orig and expect tuples get DIR_ORIGINAL */
679 if (type
== CTA_TUPLE_REPLY
)
680 tuple
->dst
.dir
= IP_CT_DIR_REPLY
;
682 tuple
->dst
.dir
= IP_CT_DIR_ORIGINAL
;
687 #ifdef CONFIG_NF_NAT_NEEDED
688 static const struct nla_policy protonat_nla_policy
[CTA_PROTONAT_MAX
+1] = {
689 [CTA_PROTONAT_PORT_MIN
] = { .type
= NLA_U16
},
690 [CTA_PROTONAT_PORT_MAX
] = { .type
= NLA_U16
},
693 static int nfnetlink_parse_nat_proto(struct nlattr
*attr
,
694 const struct nf_conn
*ct
,
695 struct nf_nat_range
*range
)
697 struct nlattr
*tb
[CTA_PROTONAT_MAX
+1];
698 const struct nf_nat_protocol
*npt
;
701 err
= nla_parse_nested(tb
, CTA_PROTONAT_MAX
, attr
, protonat_nla_policy
);
705 npt
= nf_nat_proto_find_get(nf_ct_protonum(ct
));
706 if (npt
->nlattr_to_range
)
707 err
= npt
->nlattr_to_range(tb
, range
);
708 nf_nat_proto_put(npt
);
712 static const struct nla_policy nat_nla_policy
[CTA_NAT_MAX
+1] = {
713 [CTA_NAT_MINIP
] = { .type
= NLA_U32
},
714 [CTA_NAT_MAXIP
] = { .type
= NLA_U32
},
718 nfnetlink_parse_nat(struct nlattr
*nat
,
719 const struct nf_conn
*ct
, struct nf_nat_range
*range
)
721 struct nlattr
*tb
[CTA_NAT_MAX
+1];
724 memset(range
, 0, sizeof(*range
));
726 err
= nla_parse_nested(tb
, CTA_NAT_MAX
, nat
, nat_nla_policy
);
730 if (tb
[CTA_NAT_MINIP
])
731 range
->min_ip
= nla_get_be32(tb
[CTA_NAT_MINIP
]);
733 if (!tb
[CTA_NAT_MAXIP
])
734 range
->max_ip
= range
->min_ip
;
736 range
->max_ip
= nla_get_be32(tb
[CTA_NAT_MAXIP
]);
739 range
->flags
|= IP_NAT_RANGE_MAP_IPS
;
741 if (!tb
[CTA_NAT_PROTO
])
744 err
= nfnetlink_parse_nat_proto(tb
[CTA_NAT_PROTO
], ct
, range
);
753 ctnetlink_parse_help(struct nlattr
*attr
, char **helper_name
)
755 struct nlattr
*tb
[CTA_HELP_MAX
+1];
757 nla_parse_nested(tb
, CTA_HELP_MAX
, attr
, NULL
);
759 if (!tb
[CTA_HELP_NAME
])
762 *helper_name
= nla_data(tb
[CTA_HELP_NAME
]);
767 static const struct nla_policy ct_nla_policy
[CTA_MAX
+1] = {
768 [CTA_STATUS
] = { .type
= NLA_U32
},
769 [CTA_TIMEOUT
] = { .type
= NLA_U32
},
770 [CTA_MARK
] = { .type
= NLA_U32
},
771 [CTA_USE
] = { .type
= NLA_U32
},
772 [CTA_ID
] = { .type
= NLA_U32
},
776 ctnetlink_del_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
777 struct nlmsghdr
*nlh
, struct nlattr
*cda
[])
779 struct nf_conntrack_tuple_hash
*h
;
780 struct nf_conntrack_tuple tuple
;
782 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
783 u_int8_t u3
= nfmsg
->nfgen_family
;
786 if (cda
[CTA_TUPLE_ORIG
])
787 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
, u3
);
788 else if (cda
[CTA_TUPLE_REPLY
])
789 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
, u3
);
791 /* Flush the whole table */
792 nf_conntrack_flush();
799 h
= nf_conntrack_find_get(&tuple
);
803 ct
= nf_ct_tuplehash_to_ctrack(h
);
806 u_int32_t id
= ntohl(nla_get_be32(cda
[CTA_ID
]));
807 if (id
!= (u32
)(unsigned long)ct
) {
812 if (del_timer(&ct
->timeout
))
813 ct
->timeout
.function((unsigned long)ct
);
821 ctnetlink_get_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
822 struct nlmsghdr
*nlh
, struct nlattr
*cda
[])
824 struct nf_conntrack_tuple_hash
*h
;
825 struct nf_conntrack_tuple tuple
;
827 struct sk_buff
*skb2
= NULL
;
828 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
829 u_int8_t u3
= nfmsg
->nfgen_family
;
832 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
833 #ifndef CONFIG_NF_CT_ACCT
834 if (NFNL_MSG_TYPE(nlh
->nlmsg_type
) == IPCTNL_MSG_CT_GET_CTRZERO
)
837 return netlink_dump_start(ctnl
, skb
, nlh
, ctnetlink_dump_table
,
841 if (cda
[CTA_TUPLE_ORIG
])
842 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
, u3
);
843 else if (cda
[CTA_TUPLE_REPLY
])
844 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
, u3
);
851 h
= nf_conntrack_find_get(&tuple
);
855 ct
= nf_ct_tuplehash_to_ctrack(h
);
858 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
864 err
= ctnetlink_fill_info(skb2
, NETLINK_CB(skb
).pid
, nlh
->nlmsg_seq
,
865 IPCTNL_MSG_CT_NEW
, 1, ct
);
870 err
= netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).pid
, MSG_DONTWAIT
);
883 ctnetlink_change_status(struct nf_conn
*ct
, struct nlattr
*cda
[])
886 unsigned int status
= ntohl(nla_get_be32(cda
[CTA_STATUS
]));
887 d
= ct
->status
^ status
;
889 if (d
& (IPS_EXPECTED
|IPS_CONFIRMED
|IPS_DYING
))
893 if (d
& IPS_SEEN_REPLY
&& !(status
& IPS_SEEN_REPLY
))
894 /* SEEN_REPLY bit can only be set */
898 if (d
& IPS_ASSURED
&& !(status
& IPS_ASSURED
))
899 /* ASSURED bit can only be set */
902 if (cda
[CTA_NAT_SRC
] || cda
[CTA_NAT_DST
]) {
903 #ifndef CONFIG_NF_NAT_NEEDED
906 struct nf_nat_range range
;
908 if (cda
[CTA_NAT_DST
]) {
909 if (nfnetlink_parse_nat(cda
[CTA_NAT_DST
], ct
,
912 if (nf_nat_initialized(ct
, IP_NAT_MANIP_DST
))
914 nf_nat_setup_info(ct
, &range
, IP_NAT_MANIP_DST
);
916 if (cda
[CTA_NAT_SRC
]) {
917 if (nfnetlink_parse_nat(cda
[CTA_NAT_SRC
], ct
,
920 if (nf_nat_initialized(ct
, IP_NAT_MANIP_SRC
))
922 nf_nat_setup_info(ct
, &range
, IP_NAT_MANIP_SRC
);
927 /* Be careful here, modifying NAT bits can screw up things,
928 * so don't let users modify them directly if they don't pass
930 ct
->status
|= status
& ~(IPS_NAT_DONE_MASK
| IPS_NAT_MASK
);
936 ctnetlink_change_helper(struct nf_conn
*ct
, struct nlattr
*cda
[])
938 struct nf_conntrack_helper
*helper
;
939 struct nf_conn_help
*help
= nfct_help(ct
);
943 /* don't change helper of sibling connections */
947 err
= ctnetlink_parse_help(cda
[CTA_HELP
], &helpname
);
951 if (!strcmp(helpname
, "")) {
952 if (help
&& help
->helper
) {
953 /* we had a helper before ... */
954 nf_ct_remove_expectations(ct
);
955 rcu_assign_pointer(help
->helper
, NULL
);
961 helper
= __nf_conntrack_helper_find_byname(helpname
);
966 if (help
->helper
== helper
)
970 /* need to zero data of old helper */
971 memset(&help
->help
, 0, sizeof(help
->help
));
973 help
= nf_ct_helper_ext_add(ct
, GFP_KERNEL
);
978 rcu_assign_pointer(help
->helper
, helper
);
984 ctnetlink_change_timeout(struct nf_conn
*ct
, struct nlattr
*cda
[])
986 u_int32_t timeout
= ntohl(nla_get_be32(cda
[CTA_TIMEOUT
]));
988 if (!del_timer(&ct
->timeout
))
991 ct
->timeout
.expires
= jiffies
+ timeout
* HZ
;
992 add_timer(&ct
->timeout
);
998 ctnetlink_change_protoinfo(struct nf_conn
*ct
, struct nlattr
*cda
[])
1000 struct nlattr
*tb
[CTA_PROTOINFO_MAX
+1], *attr
= cda
[CTA_PROTOINFO
];
1001 struct nf_conntrack_l4proto
*l4proto
;
1004 nla_parse_nested(tb
, CTA_PROTOINFO_MAX
, attr
, NULL
);
1006 l4proto
= nf_ct_l4proto_find_get(nf_ct_l3num(ct
), nf_ct_protonum(ct
));
1007 if (l4proto
->from_nlattr
)
1008 err
= l4proto
->from_nlattr(tb
, ct
);
1009 nf_ct_l4proto_put(l4proto
);
1014 #ifdef CONFIG_NF_NAT_NEEDED
1016 change_nat_seq_adj(struct nf_nat_seq
*natseq
, struct nlattr
*attr
)
1018 struct nlattr
*cda
[CTA_NAT_SEQ_MAX
+1];
1020 nla_parse_nested(cda
, CTA_NAT_SEQ_MAX
, attr
, NULL
);
1022 if (!cda
[CTA_NAT_SEQ_CORRECTION_POS
])
1025 natseq
->correction_pos
=
1026 ntohl(nla_get_be32(cda
[CTA_NAT_SEQ_CORRECTION_POS
]));
1028 if (!cda
[CTA_NAT_SEQ_OFFSET_BEFORE
])
1031 natseq
->offset_before
=
1032 ntohl(nla_get_be32(cda
[CTA_NAT_SEQ_OFFSET_BEFORE
]));
1034 if (!cda
[CTA_NAT_SEQ_OFFSET_AFTER
])
1037 natseq
->offset_after
=
1038 ntohl(nla_get_be32(cda
[CTA_NAT_SEQ_OFFSET_AFTER
]));
1044 ctnetlink_change_nat_seq_adj(struct nf_conn
*ct
, struct nlattr
*cda
[])
1047 struct nf_conn_nat
*nat
= nfct_nat(ct
);
1052 if (cda
[CTA_NAT_SEQ_ADJ_ORIG
]) {
1053 ret
= change_nat_seq_adj(&nat
->seq
[IP_CT_DIR_ORIGINAL
],
1054 cda
[CTA_NAT_SEQ_ADJ_ORIG
]);
1058 ct
->status
|= IPS_SEQ_ADJUST
;
1061 if (cda
[CTA_NAT_SEQ_ADJ_REPLY
]) {
1062 ret
= change_nat_seq_adj(&nat
->seq
[IP_CT_DIR_REPLY
],
1063 cda
[CTA_NAT_SEQ_ADJ_REPLY
]);
1067 ct
->status
|= IPS_SEQ_ADJUST
;
1075 ctnetlink_change_conntrack(struct nf_conn
*ct
, struct nlattr
*cda
[])
1079 if (cda
[CTA_HELP
]) {
1080 err
= ctnetlink_change_helper(ct
, cda
);
1085 if (cda
[CTA_TIMEOUT
]) {
1086 err
= ctnetlink_change_timeout(ct
, cda
);
1091 if (cda
[CTA_STATUS
]) {
1092 err
= ctnetlink_change_status(ct
, cda
);
1097 if (cda
[CTA_PROTOINFO
]) {
1098 err
= ctnetlink_change_protoinfo(ct
, cda
);
1103 #if defined(CONFIG_NF_CONNTRACK_MARK)
1105 ct
->mark
= ntohl(nla_get_be32(cda
[CTA_MARK
]));
1108 #ifdef CONFIG_NF_NAT_NEEDED
1109 if (cda
[CTA_NAT_SEQ_ADJ_ORIG
] || cda
[CTA_NAT_SEQ_ADJ_REPLY
]) {
1110 err
= ctnetlink_change_nat_seq_adj(ct
, cda
);
1120 ctnetlink_create_conntrack(struct nlattr
*cda
[],
1121 struct nf_conntrack_tuple
*otuple
,
1122 struct nf_conntrack_tuple
*rtuple
,
1123 struct nf_conn
*master_ct
)
1127 struct nf_conn_help
*help
;
1128 struct nf_conntrack_helper
*helper
;
1130 ct
= nf_conntrack_alloc(otuple
, rtuple
);
1131 if (ct
== NULL
|| IS_ERR(ct
))
1134 if (!cda
[CTA_TIMEOUT
])
1136 ct
->timeout
.expires
= ntohl(nla_get_be32(cda
[CTA_TIMEOUT
]));
1138 ct
->timeout
.expires
= jiffies
+ ct
->timeout
.expires
* HZ
;
1139 ct
->status
|= IPS_CONFIRMED
;
1141 if (cda
[CTA_STATUS
]) {
1142 err
= ctnetlink_change_status(ct
, cda
);
1147 if (cda
[CTA_PROTOINFO
]) {
1148 err
= ctnetlink_change_protoinfo(ct
, cda
);
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
);