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/rculist_nulls.h>
23 #include <linux/types.h>
24 #include <linux/timer.h>
25 #include <linux/skbuff.h>
26 #include <linux/errno.h>
27 #include <linux/netlink.h>
28 #include <linux/spinlock.h>
29 #include <linux/interrupt.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(tuple
->src
.l3num
);
109 ret
= ctnetlink_dump_tuples_ip(skb
, tuple
, l3proto
);
111 if (unlikely(ret
< 0))
114 l4proto
= __nf_ct_l4proto_find(tuple
->src
.l3num
, tuple
->dst
.protonum
);
115 ret
= ctnetlink_dump_tuples_proto(skb
, tuple
, 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
, struct nf_conn
*ct
)
148 struct nf_conntrack_l4proto
*l4proto
;
149 struct nlattr
*nest_proto
;
152 l4proto
= __nf_ct_l4proto_find(nf_ct_l3num(ct
), nf_ct_protonum(ct
));
153 if (!l4proto
->to_nlattr
)
156 nest_proto
= nla_nest_start(skb
, CTA_PROTOINFO
| NLA_F_NESTED
);
158 goto nla_put_failure
;
160 ret
= l4proto
->to_nlattr(skb
, nest_proto
, ct
);
162 nla_nest_end(skb
, nest_proto
);
171 ctnetlink_dump_helpinfo(struct sk_buff
*skb
, const struct nf_conn
*ct
)
173 struct nlattr
*nest_helper
;
174 const struct nf_conn_help
*help
= nfct_help(ct
);
175 struct nf_conntrack_helper
*helper
;
180 helper
= rcu_dereference(help
->helper
);
184 nest_helper
= nla_nest_start(skb
, CTA_HELP
| NLA_F_NESTED
);
186 goto nla_put_failure
;
187 NLA_PUT_STRING(skb
, CTA_HELP_NAME
, helper
->name
);
189 if (helper
->to_nlattr
)
190 helper
->to_nlattr(skb
, ct
);
192 nla_nest_end(skb
, nest_helper
);
201 ctnetlink_dump_counters(struct sk_buff
*skb
, const struct nf_conn
*ct
,
202 enum ip_conntrack_dir dir
)
204 enum ctattr_type type
= dir
? CTA_COUNTERS_REPLY
: CTA_COUNTERS_ORIG
;
205 struct nlattr
*nest_count
;
206 const struct nf_conn_counter
*acct
;
208 acct
= nf_conn_acct_find(ct
);
212 nest_count
= nla_nest_start(skb
, type
| NLA_F_NESTED
);
214 goto nla_put_failure
;
216 NLA_PUT_BE64(skb
, CTA_COUNTERS_PACKETS
,
217 cpu_to_be64(acct
[dir
].packets
));
218 NLA_PUT_BE64(skb
, CTA_COUNTERS_BYTES
,
219 cpu_to_be64(acct
[dir
].bytes
));
221 nla_nest_end(skb
, nest_count
);
229 #ifdef CONFIG_NF_CONNTRACK_MARK
231 ctnetlink_dump_mark(struct sk_buff
*skb
, const struct nf_conn
*ct
)
233 NLA_PUT_BE32(skb
, CTA_MARK
, htonl(ct
->mark
));
240 #define ctnetlink_dump_mark(a, b) (0)
243 #ifdef CONFIG_NF_CONNTRACK_SECMARK
245 ctnetlink_dump_secmark(struct sk_buff
*skb
, const struct nf_conn
*ct
)
247 NLA_PUT_BE32(skb
, CTA_SECMARK
, htonl(ct
->secmark
));
254 #define ctnetlink_dump_secmark(a, b) (0)
257 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
260 ctnetlink_dump_master(struct sk_buff
*skb
, const struct nf_conn
*ct
)
262 struct nlattr
*nest_parms
;
264 if (!(ct
->status
& IPS_EXPECTED
))
267 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_MASTER
| NLA_F_NESTED
);
269 goto nla_put_failure
;
270 if (ctnetlink_dump_tuples(skb
, master_tuple(ct
)) < 0)
271 goto nla_put_failure
;
272 nla_nest_end(skb
, nest_parms
);
280 #ifdef CONFIG_NF_NAT_NEEDED
282 dump_nat_seq_adj(struct sk_buff
*skb
, const struct nf_nat_seq
*natseq
, int type
)
284 struct nlattr
*nest_parms
;
286 nest_parms
= nla_nest_start(skb
, type
| NLA_F_NESTED
);
288 goto nla_put_failure
;
290 NLA_PUT_BE32(skb
, CTA_NAT_SEQ_CORRECTION_POS
,
291 htonl(natseq
->correction_pos
));
292 NLA_PUT_BE32(skb
, CTA_NAT_SEQ_OFFSET_BEFORE
,
293 htonl(natseq
->offset_before
));
294 NLA_PUT_BE32(skb
, CTA_NAT_SEQ_OFFSET_AFTER
,
295 htonl(natseq
->offset_after
));
297 nla_nest_end(skb
, nest_parms
);
306 ctnetlink_dump_nat_seq_adj(struct sk_buff
*skb
, const struct nf_conn
*ct
)
308 struct nf_nat_seq
*natseq
;
309 struct nf_conn_nat
*nat
= nfct_nat(ct
);
311 if (!(ct
->status
& IPS_SEQ_ADJUST
) || !nat
)
314 natseq
= &nat
->seq
[IP_CT_DIR_ORIGINAL
];
315 if (dump_nat_seq_adj(skb
, natseq
, CTA_NAT_SEQ_ADJ_ORIG
) == -1)
318 natseq
= &nat
->seq
[IP_CT_DIR_REPLY
];
319 if (dump_nat_seq_adj(skb
, natseq
, CTA_NAT_SEQ_ADJ_REPLY
) == -1)
325 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
329 ctnetlink_dump_id(struct sk_buff
*skb
, const struct nf_conn
*ct
)
331 NLA_PUT_BE32(skb
, CTA_ID
, htonl((unsigned long)ct
));
339 ctnetlink_dump_use(struct sk_buff
*skb
, const struct nf_conn
*ct
)
341 NLA_PUT_BE32(skb
, CTA_USE
, htonl(atomic_read(&ct
->ct_general
.use
)));
349 ctnetlink_fill_info(struct sk_buff
*skb
, u32 pid
, u32 seq
,
350 int event
, struct nf_conn
*ct
)
352 struct nlmsghdr
*nlh
;
353 struct nfgenmsg
*nfmsg
;
354 struct nlattr
*nest_parms
;
355 unsigned int flags
= pid
? NLM_F_MULTI
: 0;
357 event
|= NFNL_SUBSYS_CTNETLINK
<< 8;
358 nlh
= nlmsg_put(skb
, pid
, seq
, event
, sizeof(*nfmsg
), flags
);
362 nfmsg
= nlmsg_data(nlh
);
363 nfmsg
->nfgen_family
= nf_ct_l3num(ct
);
364 nfmsg
->version
= NFNETLINK_V0
;
367 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_ORIG
| NLA_F_NESTED
);
369 goto nla_put_failure
;
370 if (ctnetlink_dump_tuples(skb
, nf_ct_tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
371 goto nla_put_failure
;
372 nla_nest_end(skb
, nest_parms
);
374 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_REPLY
| NLA_F_NESTED
);
376 goto nla_put_failure
;
377 if (ctnetlink_dump_tuples(skb
, nf_ct_tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
378 goto nla_put_failure
;
379 nla_nest_end(skb
, nest_parms
);
381 if (ctnetlink_dump_status(skb
, ct
) < 0 ||
382 ctnetlink_dump_timeout(skb
, ct
) < 0 ||
383 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
384 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0 ||
385 ctnetlink_dump_protoinfo(skb
, ct
) < 0 ||
386 ctnetlink_dump_helpinfo(skb
, ct
) < 0 ||
387 ctnetlink_dump_mark(skb
, ct
) < 0 ||
388 ctnetlink_dump_secmark(skb
, ct
) < 0 ||
389 ctnetlink_dump_id(skb
, ct
) < 0 ||
390 ctnetlink_dump_use(skb
, ct
) < 0 ||
391 ctnetlink_dump_master(skb
, ct
) < 0 ||
392 ctnetlink_dump_nat_seq_adj(skb
, ct
) < 0)
393 goto nla_put_failure
;
400 nlmsg_cancel(skb
, nlh
);
404 #ifdef CONFIG_NF_CONNTRACK_EVENTS
406 ctnetlink_proto_size(const struct nf_conn
*ct
)
408 struct nf_conntrack_l3proto
*l3proto
;
409 struct nf_conntrack_l4proto
*l4proto
;
413 l3proto
= __nf_ct_l3proto_find(nf_ct_l3num(ct
));
414 len
+= l3proto
->nla_size
;
416 l4proto
= __nf_ct_l4proto_find(nf_ct_l3num(ct
), nf_ct_protonum(ct
));
417 len
+= l4proto
->nla_size
;
424 ctnetlink_nlmsg_size(const struct nf_conn
*ct
)
426 return NLMSG_ALIGN(sizeof(struct nfgenmsg
))
427 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
428 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
429 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
430 + 3 * nla_total_size(sizeof(u_int8_t
)) /* CTA_PROTO_NUM */
431 + nla_total_size(sizeof(u_int32_t
)) /* CTA_ID */
432 + nla_total_size(sizeof(u_int32_t
)) /* CTA_STATUS */
433 #ifdef CONFIG_NF_CT_ACCT
434 + 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
435 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
436 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
438 + nla_total_size(sizeof(u_int32_t
)) /* CTA_TIMEOUT */
439 + nla_total_size(0) /* CTA_PROTOINFO */
440 + nla_total_size(0) /* CTA_HELP */
441 + nla_total_size(NF_CT_HELPER_NAME_LEN
) /* CTA_HELP_NAME */
442 #ifdef CONFIG_NF_CONNTRACK_SECMARK
443 + nla_total_size(sizeof(u_int32_t
)) /* CTA_SECMARK */
445 #ifdef CONFIG_NF_NAT_NEEDED
446 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
447 + 6 * nla_total_size(sizeof(u_int32_t
)) /* CTA_NAT_SEQ_OFFSET */
449 #ifdef CONFIG_NF_CONNTRACK_MARK
450 + nla_total_size(sizeof(u_int32_t
)) /* CTA_MARK */
452 + ctnetlink_proto_size(ct
)
457 ctnetlink_conntrack_event(unsigned int events
, struct nf_ct_event
*item
)
459 struct nlmsghdr
*nlh
;
460 struct nfgenmsg
*nfmsg
;
461 struct nlattr
*nest_parms
;
462 struct nf_conn
*ct
= item
->ct
;
465 unsigned int flags
= 0, group
;
468 /* ignore our fake conntrack entry */
469 if (ct
== &nf_conntrack_untracked
)
472 if (events
& (1 << IPCT_DESTROY
)) {
473 type
= IPCTNL_MSG_CT_DELETE
;
474 group
= NFNLGRP_CONNTRACK_DESTROY
;
475 } else if (events
& ((1 << IPCT_NEW
) | (1 << IPCT_RELATED
))) {
476 type
= IPCTNL_MSG_CT_NEW
;
477 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
478 group
= NFNLGRP_CONNTRACK_NEW
;
480 type
= IPCTNL_MSG_CT_NEW
;
481 group
= NFNLGRP_CONNTRACK_UPDATE
;
485 if (!item
->report
&& !nfnetlink_has_listeners(group
))
488 skb
= nlmsg_new(ctnetlink_nlmsg_size(ct
), GFP_ATOMIC
);
492 type
|= NFNL_SUBSYS_CTNETLINK
<< 8;
493 nlh
= nlmsg_put(skb
, item
->pid
, 0, type
, sizeof(*nfmsg
), flags
);
497 nfmsg
= nlmsg_data(nlh
);
498 nfmsg
->nfgen_family
= nf_ct_l3num(ct
);
499 nfmsg
->version
= NFNETLINK_V0
;
503 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_ORIG
| NLA_F_NESTED
);
505 goto nla_put_failure
;
506 if (ctnetlink_dump_tuples(skb
, nf_ct_tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
507 goto nla_put_failure
;
508 nla_nest_end(skb
, nest_parms
);
510 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_REPLY
| NLA_F_NESTED
);
512 goto nla_put_failure
;
513 if (ctnetlink_dump_tuples(skb
, nf_ct_tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
514 goto nla_put_failure
;
515 nla_nest_end(skb
, nest_parms
);
517 if (ctnetlink_dump_id(skb
, ct
) < 0)
518 goto nla_put_failure
;
520 if (ctnetlink_dump_status(skb
, ct
) < 0)
521 goto nla_put_failure
;
523 if (events
& (1 << IPCT_DESTROY
)) {
524 if (ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_ORIGINAL
) < 0 ||
525 ctnetlink_dump_counters(skb
, ct
, IP_CT_DIR_REPLY
) < 0)
526 goto nla_put_failure
;
528 if (ctnetlink_dump_timeout(skb
, ct
) < 0)
529 goto nla_put_failure
;
531 if (events
& (1 << IPCT_PROTOINFO
)
532 && ctnetlink_dump_protoinfo(skb
, ct
) < 0)
533 goto nla_put_failure
;
535 if ((events
& (1 << IPCT_HELPER
) || nfct_help(ct
))
536 && ctnetlink_dump_helpinfo(skb
, ct
) < 0)
537 goto nla_put_failure
;
539 #ifdef CONFIG_NF_CONNTRACK_SECMARK
540 if ((events
& (1 << IPCT_SECMARK
) || ct
->secmark
)
541 && ctnetlink_dump_secmark(skb
, ct
) < 0)
542 goto nla_put_failure
;
545 if (events
& (1 << IPCT_RELATED
) &&
546 ctnetlink_dump_master(skb
, ct
) < 0)
547 goto nla_put_failure
;
549 if (events
& (1 << IPCT_NATSEQADJ
) &&
550 ctnetlink_dump_nat_seq_adj(skb
, ct
) < 0)
551 goto nla_put_failure
;
554 #ifdef CONFIG_NF_CONNTRACK_MARK
555 if ((events
& (1 << IPCT_MARK
) || ct
->mark
)
556 && ctnetlink_dump_mark(skb
, ct
) < 0)
557 goto nla_put_failure
;
562 err
= nfnetlink_send(skb
, item
->pid
, group
, item
->report
, GFP_ATOMIC
);
563 if (err
== -ENOBUFS
|| err
== -EAGAIN
)
570 nlmsg_cancel(skb
, nlh
);
574 nfnetlink_set_err(0, group
, -ENOBUFS
);
577 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
579 static int ctnetlink_done(struct netlink_callback
*cb
)
582 nf_ct_put((struct nf_conn
*)cb
->args
[1]);
587 ctnetlink_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
589 struct nf_conn
*ct
, *last
;
590 struct nf_conntrack_tuple_hash
*h
;
591 struct hlist_nulls_node
*n
;
592 struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
593 u_int8_t l3proto
= nfmsg
->nfgen_family
;
596 last
= (struct nf_conn
*)cb
->args
[1];
597 for (; cb
->args
[0] < nf_conntrack_htable_size
; cb
->args
[0]++) {
599 hlist_nulls_for_each_entry_rcu(h
, n
, &init_net
.ct
.hash
[cb
->args
[0]],
601 if (NF_CT_DIRECTION(h
) != IP_CT_DIR_ORIGINAL
)
603 ct
= nf_ct_tuplehash_to_ctrack(h
);
604 if (!atomic_inc_not_zero(&ct
->ct_general
.use
))
606 /* Dump entries of a given L3 protocol number.
607 * If it is not specified, ie. l3proto == 0,
608 * then dump everything. */
609 if (l3proto
&& nf_ct_l3num(ct
) != l3proto
)
616 if (ctnetlink_fill_info(skb
, NETLINK_CB(cb
->skb
).pid
,
618 IPCTNL_MSG_CT_NEW
, ct
) < 0) {
619 cb
->args
[1] = (unsigned long)ct
;
623 if (NFNL_MSG_TYPE(cb
->nlh
->nlmsg_type
) ==
624 IPCTNL_MSG_CT_GET_CTRZERO
) {
625 struct nf_conn_counter
*acct
;
627 acct
= nf_conn_acct_find(ct
);
629 memset(acct
, 0, sizeof(struct nf_conn_counter
[IP_CT_DIR_MAX
]));
648 ctnetlink_parse_tuple_ip(struct nlattr
*attr
, struct nf_conntrack_tuple
*tuple
)
650 struct nlattr
*tb
[CTA_IP_MAX
+1];
651 struct nf_conntrack_l3proto
*l3proto
;
654 nla_parse_nested(tb
, CTA_IP_MAX
, attr
, NULL
);
657 l3proto
= __nf_ct_l3proto_find(tuple
->src
.l3num
);
659 if (likely(l3proto
->nlattr_to_tuple
)) {
660 ret
= nla_validate_nested(attr
, CTA_IP_MAX
,
661 l3proto
->nla_policy
);
663 ret
= l3proto
->nlattr_to_tuple(tb
, tuple
);
671 static const struct nla_policy proto_nla_policy
[CTA_PROTO_MAX
+1] = {
672 [CTA_PROTO_NUM
] = { .type
= NLA_U8
},
676 ctnetlink_parse_tuple_proto(struct nlattr
*attr
,
677 struct nf_conntrack_tuple
*tuple
)
679 struct nlattr
*tb
[CTA_PROTO_MAX
+1];
680 struct nf_conntrack_l4proto
*l4proto
;
683 ret
= nla_parse_nested(tb
, CTA_PROTO_MAX
, attr
, proto_nla_policy
);
687 if (!tb
[CTA_PROTO_NUM
])
689 tuple
->dst
.protonum
= nla_get_u8(tb
[CTA_PROTO_NUM
]);
692 l4proto
= __nf_ct_l4proto_find(tuple
->src
.l3num
, tuple
->dst
.protonum
);
694 if (likely(l4proto
->nlattr_to_tuple
)) {
695 ret
= nla_validate_nested(attr
, CTA_PROTO_MAX
,
696 l4proto
->nla_policy
);
698 ret
= l4proto
->nlattr_to_tuple(tb
, tuple
);
707 ctnetlink_parse_tuple(const struct nlattr
* const cda
[],
708 struct nf_conntrack_tuple
*tuple
,
709 enum ctattr_tuple type
, u_int8_t l3num
)
711 struct nlattr
*tb
[CTA_TUPLE_MAX
+1];
714 memset(tuple
, 0, sizeof(*tuple
));
716 nla_parse_nested(tb
, CTA_TUPLE_MAX
, cda
[type
], NULL
);
718 if (!tb
[CTA_TUPLE_IP
])
721 tuple
->src
.l3num
= l3num
;
723 err
= ctnetlink_parse_tuple_ip(tb
[CTA_TUPLE_IP
], tuple
);
727 if (!tb
[CTA_TUPLE_PROTO
])
730 err
= ctnetlink_parse_tuple_proto(tb
[CTA_TUPLE_PROTO
], tuple
);
734 /* orig and expect tuples get DIR_ORIGINAL */
735 if (type
== CTA_TUPLE_REPLY
)
736 tuple
->dst
.dir
= IP_CT_DIR_REPLY
;
738 tuple
->dst
.dir
= IP_CT_DIR_ORIGINAL
;
744 ctnetlink_parse_help(const struct nlattr
*attr
, char **helper_name
)
746 struct nlattr
*tb
[CTA_HELP_MAX
+1];
748 nla_parse_nested(tb
, CTA_HELP_MAX
, attr
, NULL
);
750 if (!tb
[CTA_HELP_NAME
])
753 *helper_name
= nla_data(tb
[CTA_HELP_NAME
]);
758 static const struct nla_policy ct_nla_policy
[CTA_MAX
+1] = {
759 [CTA_STATUS
] = { .type
= NLA_U32
},
760 [CTA_TIMEOUT
] = { .type
= NLA_U32
},
761 [CTA_MARK
] = { .type
= NLA_U32
},
762 [CTA_USE
] = { .type
= NLA_U32
},
763 [CTA_ID
] = { .type
= NLA_U32
},
767 ctnetlink_del_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
768 const struct nlmsghdr
*nlh
,
769 const struct nlattr
* const cda
[])
771 struct nf_conntrack_tuple_hash
*h
;
772 struct nf_conntrack_tuple tuple
;
774 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
775 u_int8_t u3
= nfmsg
->nfgen_family
;
778 if (cda
[CTA_TUPLE_ORIG
])
779 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
, u3
);
780 else if (cda
[CTA_TUPLE_REPLY
])
781 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
, u3
);
783 /* Flush the whole table */
784 nf_conntrack_flush_report(&init_net
,
793 h
= nf_conntrack_find_get(&init_net
, &tuple
);
797 ct
= nf_ct_tuplehash_to_ctrack(h
);
800 u_int32_t id
= ntohl(nla_get_be32(cda
[CTA_ID
]));
801 if (id
!= (u32
)(unsigned long)ct
) {
807 if (nf_conntrack_event_report(IPCT_DESTROY
, ct
,
809 nlmsg_report(nlh
)) < 0) {
810 nf_ct_delete_from_lists(ct
);
811 /* we failed to report the event, try later */
812 nf_ct_insert_dying_list(ct
);
817 /* death_by_timeout would report the event again */
818 set_bit(IPS_DYING_BIT
, &ct
->status
);
827 ctnetlink_get_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
828 const struct nlmsghdr
*nlh
,
829 const struct nlattr
* const cda
[])
831 struct nf_conntrack_tuple_hash
*h
;
832 struct nf_conntrack_tuple tuple
;
834 struct sk_buff
*skb2
= NULL
;
835 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
836 u_int8_t u3
= nfmsg
->nfgen_family
;
839 if (nlh
->nlmsg_flags
& NLM_F_DUMP
)
840 return netlink_dump_start(ctnl
, skb
, nlh
, ctnetlink_dump_table
,
843 if (cda
[CTA_TUPLE_ORIG
])
844 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
, u3
);
845 else if (cda
[CTA_TUPLE_REPLY
])
846 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
, u3
);
853 h
= nf_conntrack_find_get(&init_net
, &tuple
);
857 ct
= nf_ct_tuplehash_to_ctrack(h
);
860 skb2
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_KERNEL
);
867 err
= ctnetlink_fill_info(skb2
, NETLINK_CB(skb
).pid
, nlh
->nlmsg_seq
,
868 IPCTNL_MSG_CT_NEW
, ct
);
874 err
= netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).pid
, MSG_DONTWAIT
);
886 #ifdef CONFIG_NF_NAT_NEEDED
888 ctnetlink_parse_nat_setup(struct nf_conn
*ct
,
889 enum nf_nat_manip_type manip
,
890 const struct nlattr
*attr
)
892 typeof(nfnetlink_parse_nat_setup_hook
) parse_nat_setup
;
894 parse_nat_setup
= rcu_dereference(nfnetlink_parse_nat_setup_hook
);
895 if (!parse_nat_setup
) {
896 #ifdef CONFIG_MODULES
898 spin_unlock_bh(&nf_conntrack_lock
);
900 if (request_module("nf-nat-ipv4") < 0) {
902 spin_lock_bh(&nf_conntrack_lock
);
907 spin_lock_bh(&nf_conntrack_lock
);
909 if (nfnetlink_parse_nat_setup_hook
)
915 return parse_nat_setup(ct
, manip
, attr
);
920 ctnetlink_change_status(struct nf_conn
*ct
, const struct nlattr
* const cda
[])
923 unsigned int status
= ntohl(nla_get_be32(cda
[CTA_STATUS
]));
924 d
= ct
->status
^ status
;
926 if (d
& (IPS_EXPECTED
|IPS_CONFIRMED
|IPS_DYING
))
930 if (d
& IPS_SEEN_REPLY
&& !(status
& IPS_SEEN_REPLY
))
931 /* SEEN_REPLY bit can only be set */
934 if (d
& IPS_ASSURED
&& !(status
& IPS_ASSURED
))
935 /* ASSURED bit can only be set */
938 /* Be careful here, modifying NAT bits can screw up things,
939 * so don't let users modify them directly if they don't pass
941 ct
->status
|= status
& ~(IPS_NAT_DONE_MASK
| IPS_NAT_MASK
);
946 ctnetlink_change_nat(struct nf_conn
*ct
, const struct nlattr
* const cda
[])
948 #ifdef CONFIG_NF_NAT_NEEDED
951 if (cda
[CTA_NAT_DST
]) {
952 ret
= ctnetlink_parse_nat_setup(ct
,
958 if (cda
[CTA_NAT_SRC
]) {
959 ret
= ctnetlink_parse_nat_setup(ct
,
972 ctnetlink_change_helper(struct nf_conn
*ct
, const struct nlattr
* const cda
[])
974 struct nf_conntrack_helper
*helper
;
975 struct nf_conn_help
*help
= nfct_help(ct
);
976 char *helpname
= NULL
;
979 /* don't change helper of sibling connections */
983 err
= ctnetlink_parse_help(cda
[CTA_HELP
], &helpname
);
987 if (!strcmp(helpname
, "")) {
988 if (help
&& help
->helper
) {
989 /* we had a helper before ... */
990 nf_ct_remove_expectations(ct
);
991 rcu_assign_pointer(help
->helper
, NULL
);
997 helper
= __nf_conntrack_helper_find_byname(helpname
);
998 if (helper
== NULL
) {
999 #ifdef CONFIG_MODULES
1000 spin_unlock_bh(&nf_conntrack_lock
);
1002 if (request_module("nfct-helper-%s", helpname
) < 0) {
1003 spin_lock_bh(&nf_conntrack_lock
);
1007 spin_lock_bh(&nf_conntrack_lock
);
1008 helper
= __nf_conntrack_helper_find_byname(helpname
);
1016 if (help
->helper
== helper
)
1020 /* need to zero data of old helper */
1021 memset(&help
->help
, 0, sizeof(help
->help
));
1023 help
= nf_ct_helper_ext_add(ct
, GFP_ATOMIC
);
1028 rcu_assign_pointer(help
->helper
, helper
);
1034 ctnetlink_change_timeout(struct nf_conn
*ct
, const struct nlattr
* const cda
[])
1036 u_int32_t timeout
= ntohl(nla_get_be32(cda
[CTA_TIMEOUT
]));
1038 if (!del_timer(&ct
->timeout
))
1041 ct
->timeout
.expires
= jiffies
+ timeout
* HZ
;
1042 add_timer(&ct
->timeout
);
1048 ctnetlink_change_protoinfo(struct nf_conn
*ct
, const struct nlattr
* const cda
[])
1050 const struct nlattr
*attr
= cda
[CTA_PROTOINFO
];
1051 struct nlattr
*tb
[CTA_PROTOINFO_MAX
+1];
1052 struct nf_conntrack_l4proto
*l4proto
;
1055 nla_parse_nested(tb
, CTA_PROTOINFO_MAX
, attr
, NULL
);
1058 l4proto
= __nf_ct_l4proto_find(nf_ct_l3num(ct
), nf_ct_protonum(ct
));
1059 if (l4proto
->from_nlattr
)
1060 err
= l4proto
->from_nlattr(tb
, ct
);
1066 #ifdef CONFIG_NF_NAT_NEEDED
1068 change_nat_seq_adj(struct nf_nat_seq
*natseq
, const struct nlattr
* const attr
)
1070 struct nlattr
*cda
[CTA_NAT_SEQ_MAX
+1];
1072 nla_parse_nested(cda
, CTA_NAT_SEQ_MAX
, attr
, NULL
);
1074 if (!cda
[CTA_NAT_SEQ_CORRECTION_POS
])
1077 natseq
->correction_pos
=
1078 ntohl(nla_get_be32(cda
[CTA_NAT_SEQ_CORRECTION_POS
]));
1080 if (!cda
[CTA_NAT_SEQ_OFFSET_BEFORE
])
1083 natseq
->offset_before
=
1084 ntohl(nla_get_be32(cda
[CTA_NAT_SEQ_OFFSET_BEFORE
]));
1086 if (!cda
[CTA_NAT_SEQ_OFFSET_AFTER
])
1089 natseq
->offset_after
=
1090 ntohl(nla_get_be32(cda
[CTA_NAT_SEQ_OFFSET_AFTER
]));
1096 ctnetlink_change_nat_seq_adj(struct nf_conn
*ct
,
1097 const struct nlattr
* const cda
[])
1100 struct nf_conn_nat
*nat
= nfct_nat(ct
);
1105 if (cda
[CTA_NAT_SEQ_ADJ_ORIG
]) {
1106 ret
= change_nat_seq_adj(&nat
->seq
[IP_CT_DIR_ORIGINAL
],
1107 cda
[CTA_NAT_SEQ_ADJ_ORIG
]);
1111 ct
->status
|= IPS_SEQ_ADJUST
;
1114 if (cda
[CTA_NAT_SEQ_ADJ_REPLY
]) {
1115 ret
= change_nat_seq_adj(&nat
->seq
[IP_CT_DIR_REPLY
],
1116 cda
[CTA_NAT_SEQ_ADJ_REPLY
]);
1120 ct
->status
|= IPS_SEQ_ADJUST
;
1128 ctnetlink_change_conntrack(struct nf_conn
*ct
,
1129 const struct nlattr
* const cda
[])
1133 /* only allow NAT changes and master assignation for new conntracks */
1134 if (cda
[CTA_NAT_SRC
] || cda
[CTA_NAT_DST
] || cda
[CTA_TUPLE_MASTER
])
1137 if (cda
[CTA_HELP
]) {
1138 err
= ctnetlink_change_helper(ct
, cda
);
1143 if (cda
[CTA_TIMEOUT
]) {
1144 err
= ctnetlink_change_timeout(ct
, cda
);
1149 if (cda
[CTA_STATUS
]) {
1150 err
= ctnetlink_change_status(ct
, cda
);
1155 if (cda
[CTA_PROTOINFO
]) {
1156 err
= ctnetlink_change_protoinfo(ct
, cda
);
1161 #if defined(CONFIG_NF_CONNTRACK_MARK)
1163 ct
->mark
= ntohl(nla_get_be32(cda
[CTA_MARK
]));
1166 #ifdef CONFIG_NF_NAT_NEEDED
1167 if (cda
[CTA_NAT_SEQ_ADJ_ORIG
] || cda
[CTA_NAT_SEQ_ADJ_REPLY
]) {
1168 err
= ctnetlink_change_nat_seq_adj(ct
, cda
);
1177 static struct nf_conn
*
1178 ctnetlink_create_conntrack(const struct nlattr
* const cda
[],
1179 struct nf_conntrack_tuple
*otuple
,
1180 struct nf_conntrack_tuple
*rtuple
,
1185 struct nf_conntrack_helper
*helper
;
1187 ct
= nf_conntrack_alloc(&init_net
, otuple
, rtuple
, GFP_ATOMIC
);
1189 return ERR_PTR(-ENOMEM
);
1191 if (!cda
[CTA_TIMEOUT
])
1193 ct
->timeout
.expires
= ntohl(nla_get_be32(cda
[CTA_TIMEOUT
]));
1195 ct
->timeout
.expires
= jiffies
+ ct
->timeout
.expires
* HZ
;
1196 ct
->status
|= IPS_CONFIRMED
;
1199 if (cda
[CTA_HELP
]) {
1200 char *helpname
= NULL
;
1202 err
= ctnetlink_parse_help(cda
[CTA_HELP
], &helpname
);
1206 helper
= __nf_conntrack_helper_find_byname(helpname
);
1207 if (helper
== NULL
) {
1209 #ifdef CONFIG_MODULES
1210 if (request_module("nfct-helper-%s", helpname
) < 0) {
1216 helper
= __nf_conntrack_helper_find_byname(helpname
);
1226 struct nf_conn_help
*help
;
1228 help
= nf_ct_helper_ext_add(ct
, GFP_ATOMIC
);
1234 /* not in hash table yet so not strictly necessary */
1235 rcu_assign_pointer(help
->helper
, helper
);
1238 /* try an implicit helper assignation */
1239 err
= __nf_ct_try_assign_helper(ct
, GFP_ATOMIC
);
1244 if (cda
[CTA_STATUS
]) {
1245 err
= ctnetlink_change_status(ct
, cda
);
1250 if (cda
[CTA_NAT_SRC
] || cda
[CTA_NAT_DST
]) {
1251 err
= ctnetlink_change_nat(ct
, cda
);
1256 #ifdef CONFIG_NF_NAT_NEEDED
1257 if (cda
[CTA_NAT_SEQ_ADJ_ORIG
] || cda
[CTA_NAT_SEQ_ADJ_REPLY
]) {
1258 err
= ctnetlink_change_nat_seq_adj(ct
, cda
);
1264 if (cda
[CTA_PROTOINFO
]) {
1265 err
= ctnetlink_change_protoinfo(ct
, cda
);
1270 nf_ct_acct_ext_add(ct
, GFP_ATOMIC
);
1271 nf_ct_ecache_ext_add(ct
, GFP_ATOMIC
);
1273 #if defined(CONFIG_NF_CONNTRACK_MARK)
1275 ct
->mark
= ntohl(nla_get_be32(cda
[CTA_MARK
]));
1278 /* setup master conntrack: this is a confirmed expectation */
1279 if (cda
[CTA_TUPLE_MASTER
]) {
1280 struct nf_conntrack_tuple master
;
1281 struct nf_conntrack_tuple_hash
*master_h
;
1282 struct nf_conn
*master_ct
;
1284 err
= ctnetlink_parse_tuple(cda
, &master
, CTA_TUPLE_MASTER
, u3
);
1288 master_h
= nf_conntrack_find_get(&init_net
, &master
);
1289 if (master_h
== NULL
) {
1293 master_ct
= nf_ct_tuplehash_to_ctrack(master_h
);
1294 __set_bit(IPS_EXPECTED_BIT
, &ct
->status
);
1295 ct
->master
= master_ct
;
1298 add_timer(&ct
->timeout
);
1299 nf_conntrack_hash_insert(ct
);
1307 nf_conntrack_free(ct
);
1308 return ERR_PTR(err
);
1312 ctnetlink_new_conntrack(struct sock
*ctnl
, struct sk_buff
*skb
,
1313 const struct nlmsghdr
*nlh
,
1314 const struct nlattr
* const cda
[])
1316 struct nf_conntrack_tuple otuple
, rtuple
;
1317 struct nf_conntrack_tuple_hash
*h
= NULL
;
1318 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1319 u_int8_t u3
= nfmsg
->nfgen_family
;
1322 if (cda
[CTA_TUPLE_ORIG
]) {
1323 err
= ctnetlink_parse_tuple(cda
, &otuple
, CTA_TUPLE_ORIG
, u3
);
1328 if (cda
[CTA_TUPLE_REPLY
]) {
1329 err
= ctnetlink_parse_tuple(cda
, &rtuple
, CTA_TUPLE_REPLY
, u3
);
1334 spin_lock_bh(&nf_conntrack_lock
);
1335 if (cda
[CTA_TUPLE_ORIG
])
1336 h
= __nf_conntrack_find(&init_net
, &otuple
);
1337 else if (cda
[CTA_TUPLE_REPLY
])
1338 h
= __nf_conntrack_find(&init_net
, &rtuple
);
1342 if (nlh
->nlmsg_flags
& NLM_F_CREATE
) {
1344 enum ip_conntrack_events events
;
1346 ct
= ctnetlink_create_conntrack(cda
, &otuple
,
1353 nf_conntrack_get(&ct
->ct_general
);
1354 spin_unlock_bh(&nf_conntrack_lock
);
1355 if (test_bit(IPS_EXPECTED_BIT
, &ct
->status
))
1356 events
= IPCT_RELATED
;
1360 nf_conntrack_eventmask_report((1 << IPCT_STATUS
) |
1361 (1 << IPCT_HELPER
) |
1362 (1 << IPCT_PROTOINFO
) |
1363 (1 << IPCT_NATSEQADJ
) |
1364 (1 << IPCT_MARK
) | events
,
1365 ct
, NETLINK_CB(skb
).pid
,
1369 spin_unlock_bh(&nf_conntrack_lock
);
1373 /* implicit 'else' */
1375 /* We manipulate the conntrack inside the global conntrack table lock,
1376 * so there's no need to increase the refcount */
1378 if (!(nlh
->nlmsg_flags
& NLM_F_EXCL
)) {
1379 struct nf_conn
*ct
= nf_ct_tuplehash_to_ctrack(h
);
1381 err
= ctnetlink_change_conntrack(ct
, cda
);
1383 nf_conntrack_get(&ct
->ct_general
);
1384 spin_unlock_bh(&nf_conntrack_lock
);
1385 nf_conntrack_eventmask_report((1 << IPCT_STATUS
) |
1386 (1 << IPCT_HELPER
) |
1387 (1 << IPCT_PROTOINFO
) |
1388 (1 << IPCT_NATSEQADJ
) |
1390 ct
, NETLINK_CB(skb
).pid
,
1394 spin_unlock_bh(&nf_conntrack_lock
);
1400 spin_unlock_bh(&nf_conntrack_lock
);
1404 /***********************************************************************
1406 ***********************************************************************/
1409 ctnetlink_exp_dump_tuple(struct sk_buff
*skb
,
1410 const struct nf_conntrack_tuple
*tuple
,
1411 enum ctattr_expect type
)
1413 struct nlattr
*nest_parms
;
1415 nest_parms
= nla_nest_start(skb
, type
| NLA_F_NESTED
);
1417 goto nla_put_failure
;
1418 if (ctnetlink_dump_tuples(skb
, tuple
) < 0)
1419 goto nla_put_failure
;
1420 nla_nest_end(skb
, nest_parms
);
1429 ctnetlink_exp_dump_mask(struct sk_buff
*skb
,
1430 const struct nf_conntrack_tuple
*tuple
,
1431 const struct nf_conntrack_tuple_mask
*mask
)
1434 struct nf_conntrack_l3proto
*l3proto
;
1435 struct nf_conntrack_l4proto
*l4proto
;
1436 struct nf_conntrack_tuple m
;
1437 struct nlattr
*nest_parms
;
1439 memset(&m
, 0xFF, sizeof(m
));
1440 m
.src
.u
.all
= mask
->src
.u
.all
;
1441 memcpy(&m
.src
.u3
, &mask
->src
.u3
, sizeof(m
.src
.u3
));
1443 nest_parms
= nla_nest_start(skb
, CTA_EXPECT_MASK
| NLA_F_NESTED
);
1445 goto nla_put_failure
;
1447 l3proto
= __nf_ct_l3proto_find(tuple
->src
.l3num
);
1448 ret
= ctnetlink_dump_tuples_ip(skb
, &m
, l3proto
);
1450 if (unlikely(ret
< 0))
1451 goto nla_put_failure
;
1453 l4proto
= __nf_ct_l4proto_find(tuple
->src
.l3num
, tuple
->dst
.protonum
);
1454 ret
= ctnetlink_dump_tuples_proto(skb
, &m
, l4proto
);
1455 if (unlikely(ret
< 0))
1456 goto nla_put_failure
;
1458 nla_nest_end(skb
, nest_parms
);
1467 ctnetlink_exp_dump_expect(struct sk_buff
*skb
,
1468 const struct nf_conntrack_expect
*exp
)
1470 struct nf_conn
*master
= exp
->master
;
1471 long timeout
= (exp
->timeout
.expires
- jiffies
) / HZ
;
1476 if (ctnetlink_exp_dump_tuple(skb
, &exp
->tuple
, CTA_EXPECT_TUPLE
) < 0)
1477 goto nla_put_failure
;
1478 if (ctnetlink_exp_dump_mask(skb
, &exp
->tuple
, &exp
->mask
) < 0)
1479 goto nla_put_failure
;
1480 if (ctnetlink_exp_dump_tuple(skb
,
1481 &master
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
,
1482 CTA_EXPECT_MASTER
) < 0)
1483 goto nla_put_failure
;
1485 NLA_PUT_BE32(skb
, CTA_EXPECT_TIMEOUT
, htonl(timeout
));
1486 NLA_PUT_BE32(skb
, CTA_EXPECT_ID
, htonl((unsigned long)exp
));
1495 ctnetlink_exp_fill_info(struct sk_buff
*skb
, u32 pid
, u32 seq
,
1496 int event
, const struct nf_conntrack_expect
*exp
)
1498 struct nlmsghdr
*nlh
;
1499 struct nfgenmsg
*nfmsg
;
1500 unsigned int flags
= pid
? NLM_F_MULTI
: 0;
1502 event
|= NFNL_SUBSYS_CTNETLINK_EXP
<< 8;
1503 nlh
= nlmsg_put(skb
, pid
, seq
, event
, sizeof(*nfmsg
), flags
);
1507 nfmsg
= nlmsg_data(nlh
);
1508 nfmsg
->nfgen_family
= exp
->tuple
.src
.l3num
;
1509 nfmsg
->version
= NFNETLINK_V0
;
1512 if (ctnetlink_exp_dump_expect(skb
, exp
) < 0)
1513 goto nla_put_failure
;
1515 nlmsg_end(skb
, nlh
);
1520 nlmsg_cancel(skb
, nlh
);
1524 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1526 ctnetlink_expect_event(unsigned int events
, struct nf_exp_event
*item
)
1528 struct nlmsghdr
*nlh
;
1529 struct nfgenmsg
*nfmsg
;
1530 struct nf_conntrack_expect
*exp
= item
->exp
;
1531 struct sk_buff
*skb
;
1535 if (events
& (1 << IPEXP_NEW
)) {
1536 type
= IPCTNL_MSG_EXP_NEW
;
1537 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
1541 if (!item
->report
&&
1542 !nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW
))
1545 skb
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_ATOMIC
);
1549 type
|= NFNL_SUBSYS_CTNETLINK_EXP
<< 8;
1550 nlh
= nlmsg_put(skb
, item
->pid
, 0, type
, sizeof(*nfmsg
), flags
);
1554 nfmsg
= nlmsg_data(nlh
);
1555 nfmsg
->nfgen_family
= exp
->tuple
.src
.l3num
;
1556 nfmsg
->version
= NFNETLINK_V0
;
1560 if (ctnetlink_exp_dump_expect(skb
, exp
) < 0)
1561 goto nla_put_failure
;
1564 nlmsg_end(skb
, nlh
);
1565 nfnetlink_send(skb
, item
->pid
, NFNLGRP_CONNTRACK_EXP_NEW
,
1566 item
->report
, GFP_ATOMIC
);
1571 nlmsg_cancel(skb
, nlh
);
1575 nfnetlink_set_err(0, 0, -ENOBUFS
);
1579 static int ctnetlink_exp_done(struct netlink_callback
*cb
)
1582 nf_ct_expect_put((struct nf_conntrack_expect
*)cb
->args
[1]);
1587 ctnetlink_exp_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1589 struct net
*net
= &init_net
;
1590 struct nf_conntrack_expect
*exp
, *last
;
1591 struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
1592 struct hlist_node
*n
;
1593 u_int8_t l3proto
= nfmsg
->nfgen_family
;
1596 last
= (struct nf_conntrack_expect
*)cb
->args
[1];
1597 for (; cb
->args
[0] < nf_ct_expect_hsize
; cb
->args
[0]++) {
1599 hlist_for_each_entry(exp
, n
, &net
->ct
.expect_hash
[cb
->args
[0]],
1601 if (l3proto
&& exp
->tuple
.src
.l3num
!= l3proto
)
1608 if (ctnetlink_exp_fill_info(skb
,
1609 NETLINK_CB(cb
->skb
).pid
,
1613 if (!atomic_inc_not_zero(&exp
->use
))
1615 cb
->args
[1] = (unsigned long)exp
;
1627 nf_ct_expect_put(last
);
1632 static const struct nla_policy exp_nla_policy
[CTA_EXPECT_MAX
+1] = {
1633 [CTA_EXPECT_TIMEOUT
] = { .type
= NLA_U32
},
1634 [CTA_EXPECT_ID
] = { .type
= NLA_U32
},
1638 ctnetlink_get_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1639 const struct nlmsghdr
*nlh
,
1640 const struct nlattr
* const cda
[])
1642 struct nf_conntrack_tuple tuple
;
1643 struct nf_conntrack_expect
*exp
;
1644 struct sk_buff
*skb2
;
1645 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1646 u_int8_t u3
= nfmsg
->nfgen_family
;
1649 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1650 return netlink_dump_start(ctnl
, skb
, nlh
,
1651 ctnetlink_exp_dump_table
,
1652 ctnetlink_exp_done
);
1655 if (cda
[CTA_EXPECT_MASTER
])
1656 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_MASTER
, u3
);
1663 exp
= nf_ct_expect_find_get(&init_net
, &tuple
);
1667 if (cda
[CTA_EXPECT_ID
]) {
1668 __be32 id
= nla_get_be32(cda
[CTA_EXPECT_ID
]);
1669 if (ntohl(id
) != (u32
)(unsigned long)exp
) {
1670 nf_ct_expect_put(exp
);
1676 skb2
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_KERNEL
);
1681 err
= ctnetlink_exp_fill_info(skb2
, NETLINK_CB(skb
).pid
,
1682 nlh
->nlmsg_seq
, IPCTNL_MSG_EXP_NEW
, exp
);
1687 nf_ct_expect_put(exp
);
1689 return netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).pid
, MSG_DONTWAIT
);
1694 nf_ct_expect_put(exp
);
1699 ctnetlink_del_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1700 const struct nlmsghdr
*nlh
,
1701 const struct nlattr
* const cda
[])
1703 struct nf_conntrack_expect
*exp
;
1704 struct nf_conntrack_tuple tuple
;
1705 struct nf_conntrack_helper
*h
;
1706 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1707 struct hlist_node
*n
, *next
;
1708 u_int8_t u3
= nfmsg
->nfgen_family
;
1712 if (cda
[CTA_EXPECT_TUPLE
]) {
1713 /* delete a single expect by tuple */
1714 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
, u3
);
1718 /* bump usage count to 2 */
1719 exp
= nf_ct_expect_find_get(&init_net
, &tuple
);
1723 if (cda
[CTA_EXPECT_ID
]) {
1724 __be32 id
= nla_get_be32(cda
[CTA_EXPECT_ID
]);
1725 if (ntohl(id
) != (u32
)(unsigned long)exp
) {
1726 nf_ct_expect_put(exp
);
1731 /* after list removal, usage count == 1 */
1732 nf_ct_unexpect_related(exp
);
1733 /* have to put what we 'get' above.
1734 * after this line usage count == 0 */
1735 nf_ct_expect_put(exp
);
1736 } else if (cda
[CTA_EXPECT_HELP_NAME
]) {
1737 char *name
= nla_data(cda
[CTA_EXPECT_HELP_NAME
]);
1738 struct nf_conn_help
*m_help
;
1740 /* delete all expectations for this helper */
1741 spin_lock_bh(&nf_conntrack_lock
);
1742 h
= __nf_conntrack_helper_find_byname(name
);
1744 spin_unlock_bh(&nf_conntrack_lock
);
1747 for (i
= 0; i
< nf_ct_expect_hsize
; i
++) {
1748 hlist_for_each_entry_safe(exp
, n
, next
,
1749 &init_net
.ct
.expect_hash
[i
],
1751 m_help
= nfct_help(exp
->master
);
1752 if (m_help
->helper
== h
1753 && del_timer(&exp
->timeout
)) {
1754 nf_ct_unlink_expect(exp
);
1755 nf_ct_expect_put(exp
);
1759 spin_unlock_bh(&nf_conntrack_lock
);
1761 /* This basically means we have to flush everything*/
1762 spin_lock_bh(&nf_conntrack_lock
);
1763 for (i
= 0; i
< nf_ct_expect_hsize
; i
++) {
1764 hlist_for_each_entry_safe(exp
, n
, next
,
1765 &init_net
.ct
.expect_hash
[i
],
1767 if (del_timer(&exp
->timeout
)) {
1768 nf_ct_unlink_expect(exp
);
1769 nf_ct_expect_put(exp
);
1773 spin_unlock_bh(&nf_conntrack_lock
);
1779 ctnetlink_change_expect(struct nf_conntrack_expect
*x
,
1780 const struct nlattr
* const cda
[])
1786 ctnetlink_create_expect(const struct nlattr
* const cda
[], u_int8_t u3
,
1787 u32 pid
, int report
)
1789 struct nf_conntrack_tuple tuple
, mask
, master_tuple
;
1790 struct nf_conntrack_tuple_hash
*h
= NULL
;
1791 struct nf_conntrack_expect
*exp
;
1793 struct nf_conn_help
*help
;
1796 /* caller guarantees that those three CTA_EXPECT_* exist */
1797 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
, u3
);
1800 err
= ctnetlink_parse_tuple(cda
, &mask
, CTA_EXPECT_MASK
, u3
);
1803 err
= ctnetlink_parse_tuple(cda
, &master_tuple
, CTA_EXPECT_MASTER
, u3
);
1807 /* Look for master conntrack of this expectation */
1808 h
= nf_conntrack_find_get(&init_net
, &master_tuple
);
1811 ct
= nf_ct_tuplehash_to_ctrack(h
);
1812 help
= nfct_help(ct
);
1814 if (!help
|| !help
->helper
) {
1815 /* such conntrack hasn't got any helper, abort */
1820 exp
= nf_ct_expect_alloc(ct
);
1827 exp
->expectfn
= NULL
;
1831 memcpy(&exp
->tuple
, &tuple
, sizeof(struct nf_conntrack_tuple
));
1832 memcpy(&exp
->mask
.src
.u3
, &mask
.src
.u3
, sizeof(exp
->mask
.src
.u3
));
1833 exp
->mask
.src
.u
.all
= mask
.src
.u
.all
;
1835 err
= nf_ct_expect_related_report(exp
, pid
, report
);
1836 nf_ct_expect_put(exp
);
1839 nf_ct_put(nf_ct_tuplehash_to_ctrack(h
));
1844 ctnetlink_new_expect(struct sock
*ctnl
, struct sk_buff
*skb
,
1845 const struct nlmsghdr
*nlh
,
1846 const struct nlattr
* const cda
[])
1848 struct nf_conntrack_tuple tuple
;
1849 struct nf_conntrack_expect
*exp
;
1850 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1851 u_int8_t u3
= nfmsg
->nfgen_family
;
1854 if (!cda
[CTA_EXPECT_TUPLE
]
1855 || !cda
[CTA_EXPECT_MASK
]
1856 || !cda
[CTA_EXPECT_MASTER
])
1859 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
, u3
);
1863 spin_lock_bh(&nf_conntrack_lock
);
1864 exp
= __nf_ct_expect_find(&init_net
, &tuple
);
1867 spin_unlock_bh(&nf_conntrack_lock
);
1869 if (nlh
->nlmsg_flags
& NLM_F_CREATE
) {
1870 err
= ctnetlink_create_expect(cda
,
1872 NETLINK_CB(skb
).pid
,
1879 if (!(nlh
->nlmsg_flags
& NLM_F_EXCL
))
1880 err
= ctnetlink_change_expect(exp
, cda
);
1881 spin_unlock_bh(&nf_conntrack_lock
);
1886 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1887 static struct nf_ct_event_notifier ctnl_notifier
= {
1888 .fcn
= ctnetlink_conntrack_event
,
1891 static struct nf_exp_event_notifier ctnl_notifier_exp
= {
1892 .fcn
= ctnetlink_expect_event
,
1896 static const struct nfnl_callback ctnl_cb
[IPCTNL_MSG_MAX
] = {
1897 [IPCTNL_MSG_CT_NEW
] = { .call
= ctnetlink_new_conntrack
,
1898 .attr_count
= CTA_MAX
,
1899 .policy
= ct_nla_policy
},
1900 [IPCTNL_MSG_CT_GET
] = { .call
= ctnetlink_get_conntrack
,
1901 .attr_count
= CTA_MAX
,
1902 .policy
= ct_nla_policy
},
1903 [IPCTNL_MSG_CT_DELETE
] = { .call
= ctnetlink_del_conntrack
,
1904 .attr_count
= CTA_MAX
,
1905 .policy
= ct_nla_policy
},
1906 [IPCTNL_MSG_CT_GET_CTRZERO
] = { .call
= ctnetlink_get_conntrack
,
1907 .attr_count
= CTA_MAX
,
1908 .policy
= ct_nla_policy
},
1911 static const struct nfnl_callback ctnl_exp_cb
[IPCTNL_MSG_EXP_MAX
] = {
1912 [IPCTNL_MSG_EXP_GET
] = { .call
= ctnetlink_get_expect
,
1913 .attr_count
= CTA_EXPECT_MAX
,
1914 .policy
= exp_nla_policy
},
1915 [IPCTNL_MSG_EXP_NEW
] = { .call
= ctnetlink_new_expect
,
1916 .attr_count
= CTA_EXPECT_MAX
,
1917 .policy
= exp_nla_policy
},
1918 [IPCTNL_MSG_EXP_DELETE
] = { .call
= ctnetlink_del_expect
,
1919 .attr_count
= CTA_EXPECT_MAX
,
1920 .policy
= exp_nla_policy
},
1923 static const struct nfnetlink_subsystem ctnl_subsys
= {
1924 .name
= "conntrack",
1925 .subsys_id
= NFNL_SUBSYS_CTNETLINK
,
1926 .cb_count
= IPCTNL_MSG_MAX
,
1930 static const struct nfnetlink_subsystem ctnl_exp_subsys
= {
1931 .name
= "conntrack_expect",
1932 .subsys_id
= NFNL_SUBSYS_CTNETLINK_EXP
,
1933 .cb_count
= IPCTNL_MSG_EXP_MAX
,
1937 MODULE_ALIAS("ip_conntrack_netlink");
1938 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK
);
1939 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP
);
1941 static int __init
ctnetlink_init(void)
1945 printk("ctnetlink v%s: registering with nfnetlink.\n", version
);
1946 ret
= nfnetlink_subsys_register(&ctnl_subsys
);
1948 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1952 ret
= nfnetlink_subsys_register(&ctnl_exp_subsys
);
1954 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1955 goto err_unreg_subsys
;
1958 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1959 ret
= nf_conntrack_register_notifier(&ctnl_notifier
);
1961 printk("ctnetlink_init: cannot register notifier.\n");
1962 goto err_unreg_exp_subsys
;
1965 ret
= nf_ct_expect_register_notifier(&ctnl_notifier_exp
);
1967 printk("ctnetlink_init: cannot expect register notifier.\n");
1968 goto err_unreg_notifier
;
1974 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1976 nf_conntrack_unregister_notifier(&ctnl_notifier
);
1977 err_unreg_exp_subsys
:
1978 nfnetlink_subsys_unregister(&ctnl_exp_subsys
);
1981 nfnetlink_subsys_unregister(&ctnl_subsys
);
1986 static void __exit
ctnetlink_exit(void)
1988 printk("ctnetlink: unregistering from nfnetlink.\n");
1990 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1991 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp
);
1992 nf_conntrack_unregister_notifier(&ctnl_notifier
);
1995 nfnetlink_subsys_unregister(&ctnl_exp_subsys
);
1996 nfnetlink_subsys_unregister(&ctnl_subsys
);
2000 module_init(ctnetlink_init
);
2001 module_exit(ctnetlink_exit
);