2 * H.323 connection tracking helper
4 * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net>
6 * This source code is licensed under General Public License version 2.
8 * Based on the 'brute force' H.323 connection tracking module by
9 * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
11 * For more information, please see http://nath323.sourceforge.net/
14 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/ctype.h>
17 #include <linux/inet.h>
20 #include <linux/udp.h>
21 #include <linux/tcp.h>
22 #include <linux/skbuff.h>
23 #include <net/route.h>
24 #include <net/ip6_route.h>
26 #include <net/netfilter/nf_conntrack.h>
27 #include <net/netfilter/nf_conntrack_core.h>
28 #include <net/netfilter/nf_conntrack_tuple.h>
29 #include <net/netfilter/nf_conntrack_expect.h>
30 #include <net/netfilter/nf_conntrack_ecache.h>
31 #include <net/netfilter/nf_conntrack_helper.h>
32 #include <linux/netfilter/nf_conntrack_h323.h>
35 static unsigned int default_rrq_ttl __read_mostly
= 300;
36 module_param(default_rrq_ttl
, uint
, 0600);
37 MODULE_PARM_DESC(default_rrq_ttl
, "use this TTL if it's missing in RRQ");
39 static int gkrouted_only __read_mostly
= 1;
40 module_param(gkrouted_only
, int, 0600);
41 MODULE_PARM_DESC(gkrouted_only
, "only accept calls from gatekeeper");
43 static int callforward_filter __read_mostly
= 1;
44 module_param(callforward_filter
, bool, 0600);
45 MODULE_PARM_DESC(callforward_filter
, "only create call forwarding expectations "
46 "if both endpoints are on different sides "
47 "(determined by routing information)");
50 int (*set_h245_addr_hook
) (struct sk_buff
*skb
,
51 unsigned char **data
, int dataoff
,
52 H245_TransportAddress
*taddr
,
53 union nf_inet_addr
*addr
, __be16 port
)
55 int (*set_h225_addr_hook
) (struct sk_buff
*skb
,
56 unsigned char **data
, int dataoff
,
57 TransportAddress
*taddr
,
58 union nf_inet_addr
*addr
, __be16 port
)
60 int (*set_sig_addr_hook
) (struct sk_buff
*skb
,
62 enum ip_conntrack_info ctinfo
,
64 TransportAddress
*taddr
, int count
) __read_mostly
;
65 int (*set_ras_addr_hook
) (struct sk_buff
*skb
,
67 enum ip_conntrack_info ctinfo
,
69 TransportAddress
*taddr
, int count
) __read_mostly
;
70 int (*nat_rtp_rtcp_hook
) (struct sk_buff
*skb
,
72 enum ip_conntrack_info ctinfo
,
73 unsigned char **data
, int dataoff
,
74 H245_TransportAddress
*taddr
,
75 __be16 port
, __be16 rtp_port
,
76 struct nf_conntrack_expect
*rtp_exp
,
77 struct nf_conntrack_expect
*rtcp_exp
) __read_mostly
;
78 int (*nat_t120_hook
) (struct sk_buff
*skb
,
80 enum ip_conntrack_info ctinfo
,
81 unsigned char **data
, int dataoff
,
82 H245_TransportAddress
*taddr
, __be16 port
,
83 struct nf_conntrack_expect
*exp
) __read_mostly
;
84 int (*nat_h245_hook
) (struct sk_buff
*skb
,
86 enum ip_conntrack_info ctinfo
,
87 unsigned char **data
, int dataoff
,
88 TransportAddress
*taddr
, __be16 port
,
89 struct nf_conntrack_expect
*exp
) __read_mostly
;
90 int (*nat_callforwarding_hook
) (struct sk_buff
*skb
,
92 enum ip_conntrack_info ctinfo
,
93 unsigned char **data
, int dataoff
,
94 TransportAddress
*taddr
, __be16 port
,
95 struct nf_conntrack_expect
*exp
) __read_mostly
;
96 int (*nat_q931_hook
) (struct sk_buff
*skb
,
98 enum ip_conntrack_info ctinfo
,
99 unsigned char **data
, TransportAddress
*taddr
, int idx
,
100 __be16 port
, struct nf_conntrack_expect
*exp
)
103 static DEFINE_SPINLOCK(nf_h323_lock
);
104 static char *h323_buffer
;
106 static struct nf_conntrack_helper nf_conntrack_helper_h245
;
107 static struct nf_conntrack_helper nf_conntrack_helper_q931
[];
108 static struct nf_conntrack_helper nf_conntrack_helper_ras
[];
110 /****************************************************************************/
111 static int get_tpkt_data(struct sk_buff
*skb
, unsigned int protoff
,
112 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
,
113 unsigned char **data
, int *datalen
, int *dataoff
)
115 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
116 int dir
= CTINFO2DIR(ctinfo
);
117 const struct tcphdr
*th
;
126 th
= skb_header_pointer(skb
, protoff
, sizeof(_tcph
), &_tcph
);
130 /* Get TCP data offset */
131 tcpdataoff
= protoff
+ th
->doff
* 4;
133 /* Get TCP data length */
134 tcpdatalen
= skb
->len
- tcpdataoff
;
135 if (tcpdatalen
<= 0) /* No TCP data */
138 if (*data
== NULL
) { /* first TPKT */
139 /* Get first TPKT pointer */
140 tpkt
= skb_header_pointer(skb
, tcpdataoff
, tcpdatalen
,
142 BUG_ON(tpkt
== NULL
);
144 /* Validate TPKT identifier */
145 if (tcpdatalen
< 4 || tpkt
[0] != 0x03 || tpkt
[1] != 0) {
146 /* Netmeeting sends TPKT header and data separately */
147 if (info
->tpkt_len
[dir
] > 0) {
148 pr_debug("nf_ct_h323: previous packet "
149 "indicated separate TPKT data of %hu "
150 "bytes\n", info
->tpkt_len
[dir
]);
151 if (info
->tpkt_len
[dir
] <= tcpdatalen
) {
152 /* Yes, there was a TPKT header
155 *datalen
= info
->tpkt_len
[dir
];
160 /* Fragmented TPKT */
161 pr_debug("nf_ct_h323: fragmented TPKT\n");
165 /* It is not even a TPKT */
169 } else { /* Next TPKT */
170 tpktoff
= *dataoff
+ *datalen
;
171 tcpdatalen
-= tpktoff
;
172 if (tcpdatalen
<= 4) /* No more TPKT */
174 tpkt
= *data
+ *datalen
;
176 /* Validate TPKT identifier */
177 if (tpkt
[0] != 0x03 || tpkt
[1] != 0)
181 /* Validate TPKT length */
182 tpktlen
= tpkt
[2] * 256 + tpkt
[3];
185 if (tpktlen
> tcpdatalen
) {
186 if (tcpdatalen
== 4) { /* Separate TPKT header */
187 /* Netmeeting sends TPKT header and data separately */
188 pr_debug("nf_ct_h323: separate TPKT header indicates "
189 "there will be TPKT data of %hu bytes\n",
191 info
->tpkt_len
[dir
] = tpktlen
- 4;
196 printk("nf_ct_h323: incomplete TPKT (fragmented?)\n");
200 /* This is the encapsulated data */
202 *datalen
= tpktlen
- 4;
203 *dataoff
= tpktoff
+ 4;
206 /* Clear TPKT length */
207 info
->tpkt_len
[dir
] = 0;
211 info
->tpkt_len
[dir
] = 0;
215 /****************************************************************************/
216 static int get_h245_addr(struct nf_conn
*ct
, const unsigned char *data
,
217 H245_TransportAddress
*taddr
,
218 union nf_inet_addr
*addr
, __be16
*port
)
220 const unsigned char *p
;
223 if (taddr
->choice
!= eH245_TransportAddress_unicastAddress
)
226 switch (taddr
->unicastAddress
.choice
) {
227 case eUnicastAddress_iPAddress
:
228 if (nf_ct_l3num(ct
) != AF_INET
)
230 p
= data
+ taddr
->unicastAddress
.iPAddress
.network
;
233 case eUnicastAddress_iP6Address
:
234 if (nf_ct_l3num(ct
) != AF_INET6
)
236 p
= data
+ taddr
->unicastAddress
.iP6Address
.network
;
243 memcpy(addr
, p
, len
);
244 memset((void *)addr
+ len
, 0, sizeof(*addr
) - len
);
245 memcpy(port
, p
+ len
, sizeof(__be16
));
250 /****************************************************************************/
251 static int expect_rtp_rtcp(struct sk_buff
*skb
, struct nf_conn
*ct
,
252 enum ip_conntrack_info ctinfo
,
253 unsigned char **data
, int dataoff
,
254 H245_TransportAddress
*taddr
)
256 int dir
= CTINFO2DIR(ctinfo
);
259 __be16 rtp_port
, rtcp_port
;
260 union nf_inet_addr addr
;
261 struct nf_conntrack_expect
*rtp_exp
;
262 struct nf_conntrack_expect
*rtcp_exp
;
263 typeof(nat_rtp_rtcp_hook
) nat_rtp_rtcp
;
265 /* Read RTP or RTCP address */
266 if (!get_h245_addr(ct
, *data
, taddr
, &addr
, &port
) ||
267 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) ||
271 /* RTP port is even */
274 rtcp_port
= htons(ntohs(port
) + 1);
276 /* Create expect for RTP */
277 if ((rtp_exp
= nf_ct_expect_alloc(ct
)) == NULL
)
279 nf_ct_expect_init(rtp_exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
280 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
281 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
282 IPPROTO_UDP
, NULL
, &rtp_port
);
284 /* Create expect for RTCP */
285 if ((rtcp_exp
= nf_ct_expect_alloc(ct
)) == NULL
) {
286 nf_ct_expect_put(rtp_exp
);
289 nf_ct_expect_init(rtcp_exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
290 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
291 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
292 IPPROTO_UDP
, NULL
, &rtcp_port
);
294 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
295 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
296 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
297 (nat_rtp_rtcp
= rcu_dereference(nat_rtp_rtcp_hook
)) &&
298 ct
->status
& IPS_NAT_MASK
) {
300 ret
= nat_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
301 taddr
, port
, rtp_port
, rtp_exp
, rtcp_exp
);
302 } else { /* Conntrack only */
303 if (nf_ct_expect_related(rtp_exp
) == 0) {
304 if (nf_ct_expect_related(rtcp_exp
) == 0) {
305 pr_debug("nf_ct_h323: expect RTP ");
306 nf_ct_dump_tuple(&rtp_exp
->tuple
);
307 pr_debug("nf_ct_h323: expect RTCP ");
308 nf_ct_dump_tuple(&rtcp_exp
->tuple
);
310 nf_ct_unexpect_related(rtp_exp
);
317 nf_ct_expect_put(rtp_exp
);
318 nf_ct_expect_put(rtcp_exp
);
323 /****************************************************************************/
324 static int expect_t120(struct sk_buff
*skb
,
326 enum ip_conntrack_info ctinfo
,
327 unsigned char **data
, int dataoff
,
328 H245_TransportAddress
*taddr
)
330 int dir
= CTINFO2DIR(ctinfo
);
333 union nf_inet_addr addr
;
334 struct nf_conntrack_expect
*exp
;
335 typeof(nat_t120_hook
) nat_t120
;
337 /* Read T.120 address */
338 if (!get_h245_addr(ct
, *data
, taddr
, &addr
, &port
) ||
339 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) ||
343 /* Create expect for T.120 connections */
344 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
346 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
347 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
348 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
349 IPPROTO_TCP
, NULL
, &port
);
350 exp
->flags
= NF_CT_EXPECT_PERMANENT
; /* Accept multiple channels */
352 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
353 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
354 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
355 (nat_t120
= rcu_dereference(nat_t120_hook
)) &&
356 ct
->status
& IPS_NAT_MASK
) {
358 ret
= nat_t120(skb
, ct
, ctinfo
, data
, dataoff
, taddr
,
360 } else { /* Conntrack only */
361 if (nf_ct_expect_related(exp
) == 0) {
362 pr_debug("nf_ct_h323: expect T.120 ");
363 nf_ct_dump_tuple(&exp
->tuple
);
368 nf_ct_expect_put(exp
);
373 /****************************************************************************/
374 static int process_h245_channel(struct sk_buff
*skb
,
376 enum ip_conntrack_info ctinfo
,
377 unsigned char **data
, int dataoff
,
378 H2250LogicalChannelParameters
*channel
)
382 if (channel
->options
& eH2250LogicalChannelParameters_mediaChannel
) {
384 ret
= expect_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
385 &channel
->mediaChannel
);
391 options
& eH2250LogicalChannelParameters_mediaControlChannel
) {
393 ret
= expect_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
394 &channel
->mediaControlChannel
);
402 /****************************************************************************/
403 static int process_olc(struct sk_buff
*skb
, struct nf_conn
*ct
,
404 enum ip_conntrack_info ctinfo
,
405 unsigned char **data
, int dataoff
,
406 OpenLogicalChannel
*olc
)
410 pr_debug("nf_ct_h323: OpenLogicalChannel\n");
412 if (olc
->forwardLogicalChannelParameters
.multiplexParameters
.choice
==
413 eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters
)
415 ret
= process_h245_channel(skb
, ct
, ctinfo
, data
, dataoff
,
417 forwardLogicalChannelParameters
.
419 h2250LogicalChannelParameters
);
425 eOpenLogicalChannel_reverseLogicalChannelParameters
) &&
426 (olc
->reverseLogicalChannelParameters
.options
&
427 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters
)
428 && (olc
->reverseLogicalChannelParameters
.multiplexParameters
.
430 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters
))
433 process_h245_channel(skb
, ct
, ctinfo
, data
, dataoff
,
435 reverseLogicalChannelParameters
.
437 h2250LogicalChannelParameters
);
442 if ((olc
->options
& eOpenLogicalChannel_separateStack
) &&
443 olc
->forwardLogicalChannelParameters
.dataType
.choice
==
445 olc
->forwardLogicalChannelParameters
.dataType
.data
.application
.
446 choice
== eDataApplicationCapability_application_t120
&&
447 olc
->forwardLogicalChannelParameters
.dataType
.data
.application
.
448 t120
.choice
== eDataProtocolCapability_separateLANStack
&&
449 olc
->separateStack
.networkAddress
.choice
==
450 eNetworkAccessParameters_networkAddress_localAreaAddress
) {
451 ret
= expect_t120(skb
, ct
, ctinfo
, data
, dataoff
,
452 &olc
->separateStack
.networkAddress
.
461 /****************************************************************************/
462 static int process_olca(struct sk_buff
*skb
, struct nf_conn
*ct
,
463 enum ip_conntrack_info ctinfo
,
464 unsigned char **data
, int dataoff
,
465 OpenLogicalChannelAck
*olca
)
467 H2250LogicalChannelAckParameters
*ack
;
470 pr_debug("nf_ct_h323: OpenLogicalChannelAck\n");
473 eOpenLogicalChannelAck_reverseLogicalChannelParameters
) &&
474 (olca
->reverseLogicalChannelParameters
.options
&
475 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters
)
476 && (olca
->reverseLogicalChannelParameters
.multiplexParameters
.
478 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters
))
480 ret
= process_h245_channel(skb
, ct
, ctinfo
, data
, dataoff
,
482 reverseLogicalChannelParameters
.
484 h2250LogicalChannelParameters
);
490 eOpenLogicalChannelAck_forwardMultiplexAckParameters
) &&
491 (olca
->forwardMultiplexAckParameters
.choice
==
492 eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters
))
494 ack
= &olca
->forwardMultiplexAckParameters
.
495 h2250LogicalChannelAckParameters
;
497 eH2250LogicalChannelAckParameters_mediaChannel
) {
499 ret
= expect_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
506 eH2250LogicalChannelAckParameters_mediaControlChannel
) {
508 ret
= expect_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
509 &ack
->mediaControlChannel
);
515 if ((olca
->options
& eOpenLogicalChannelAck_separateStack
) &&
516 olca
->separateStack
.networkAddress
.choice
==
517 eNetworkAccessParameters_networkAddress_localAreaAddress
) {
518 ret
= expect_t120(skb
, ct
, ctinfo
, data
, dataoff
,
519 &olca
->separateStack
.networkAddress
.
528 /****************************************************************************/
529 static int process_h245(struct sk_buff
*skb
, struct nf_conn
*ct
,
530 enum ip_conntrack_info ctinfo
,
531 unsigned char **data
, int dataoff
,
532 MultimediaSystemControlMessage
*mscm
)
534 switch (mscm
->choice
) {
535 case eMultimediaSystemControlMessage_request
:
536 if (mscm
->request
.choice
==
537 eRequestMessage_openLogicalChannel
) {
538 return process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
539 &mscm
->request
.openLogicalChannel
);
541 pr_debug("nf_ct_h323: H.245 Request %d\n",
542 mscm
->request
.choice
);
544 case eMultimediaSystemControlMessage_response
:
545 if (mscm
->response
.choice
==
546 eResponseMessage_openLogicalChannelAck
) {
547 return process_olca(skb
, ct
, ctinfo
, data
, dataoff
,
549 openLogicalChannelAck
);
551 pr_debug("nf_ct_h323: H.245 Response %d\n",
552 mscm
->response
.choice
);
555 pr_debug("nf_ct_h323: H.245 signal %d\n", mscm
->choice
);
562 /****************************************************************************/
563 static int h245_help(struct sk_buff
*skb
, unsigned int protoff
,
564 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
566 static MultimediaSystemControlMessage mscm
;
567 unsigned char *data
= NULL
;
572 /* Until there's been traffic both ways, don't look in packets. */
573 if (ctinfo
!= IP_CT_ESTABLISHED
&&
574 ctinfo
!= IP_CT_ESTABLISHED
+ IP_CT_IS_REPLY
) {
577 pr_debug("nf_ct_h245: skblen = %u\n", skb
->len
);
579 spin_lock_bh(&nf_h323_lock
);
581 /* Process each TPKT */
582 while (get_tpkt_data(skb
, protoff
, ct
, ctinfo
,
583 &data
, &datalen
, &dataoff
)) {
584 pr_debug("nf_ct_h245: TPKT len=%d ", datalen
);
585 nf_ct_dump_tuple(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
587 /* Decode H.245 signal */
588 ret
= DecodeMultimediaSystemControlMessage(data
, datalen
,
591 pr_debug("nf_ct_h245: decoding error: %s\n",
592 ret
== H323_ERROR_BOUND
?
593 "out of bound" : "out of range");
594 /* We don't drop when decoding error */
598 /* Process H.245 signal */
599 if (process_h245(skb
, ct
, ctinfo
, &data
, dataoff
, &mscm
) < 0)
603 spin_unlock_bh(&nf_h323_lock
);
607 spin_unlock_bh(&nf_h323_lock
);
609 printk("nf_ct_h245: packet dropped\n");
613 /****************************************************************************/
614 static const struct nf_conntrack_expect_policy h245_exp_policy
= {
615 .max_expected
= H323_RTP_CHANNEL_MAX
* 4 + 2 /* T.120 */,
619 static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly
= {
622 .tuple
.src
.l3num
= AF_UNSPEC
,
623 .tuple
.dst
.protonum
= IPPROTO_UDP
,
625 .expect_policy
= &h245_exp_policy
,
628 /****************************************************************************/
629 int get_h225_addr(struct nf_conn
*ct
, unsigned char *data
,
630 TransportAddress
*taddr
,
631 union nf_inet_addr
*addr
, __be16
*port
)
633 const unsigned char *p
;
636 switch (taddr
->choice
) {
637 case eTransportAddress_ipAddress
:
638 if (nf_ct_l3num(ct
) != AF_INET
)
640 p
= data
+ taddr
->ipAddress
.ip
;
643 case eTransportAddress_ip6Address
:
644 if (nf_ct_l3num(ct
) != AF_INET6
)
646 p
= data
+ taddr
->ip6Address
.ip
;
653 memcpy(addr
, p
, len
);
654 memset((void *)addr
+ len
, 0, sizeof(*addr
) - len
);
655 memcpy(port
, p
+ len
, sizeof(__be16
));
660 /****************************************************************************/
661 static int expect_h245(struct sk_buff
*skb
, struct nf_conn
*ct
,
662 enum ip_conntrack_info ctinfo
,
663 unsigned char **data
, int dataoff
,
664 TransportAddress
*taddr
)
666 int dir
= CTINFO2DIR(ctinfo
);
669 union nf_inet_addr addr
;
670 struct nf_conntrack_expect
*exp
;
671 typeof(nat_h245_hook
) nat_h245
;
673 /* Read h245Address */
674 if (!get_h225_addr(ct
, *data
, taddr
, &addr
, &port
) ||
675 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) ||
679 /* Create expect for h245 connection */
680 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
682 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
683 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
684 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
685 IPPROTO_TCP
, NULL
, &port
);
686 exp
->helper
= &nf_conntrack_helper_h245
;
688 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
689 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
690 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
691 (nat_h245
= rcu_dereference(nat_h245_hook
)) &&
692 ct
->status
& IPS_NAT_MASK
) {
694 ret
= nat_h245(skb
, ct
, ctinfo
, data
, dataoff
, taddr
,
696 } else { /* Conntrack only */
697 if (nf_ct_expect_related(exp
) == 0) {
698 pr_debug("nf_ct_q931: expect H.245 ");
699 nf_ct_dump_tuple(&exp
->tuple
);
704 nf_ct_expect_put(exp
);
709 /* If the calling party is on the same side of the forward-to party,
710 * we don't need to track the second call */
711 static int callforward_do_filter(const union nf_inet_addr
*src
,
712 const union nf_inet_addr
*dst
,
715 const struct nf_afinfo
*afinfo
;
716 struct flowi fl1
, fl2
;
719 /* rcu_read_lock()ed by nf_hook_slow() */
720 afinfo
= nf_get_afinfo(family
);
724 memset(&fl1
, 0, sizeof(fl1
));
725 memset(&fl2
, 0, sizeof(fl2
));
729 struct rtable
*rt1
, *rt2
;
731 fl1
.fl4_dst
= src
->ip
;
732 fl2
.fl4_dst
= dst
->ip
;
733 if (!afinfo
->route((struct dst_entry
**)&rt1
, &fl1
)) {
734 if (!afinfo
->route((struct dst_entry
**)&rt2
, &fl2
)) {
735 if (rt1
->rt_gateway
== rt2
->rt_gateway
&&
736 rt1
->u
.dst
.dev
== rt2
->u
.dst
.dev
)
738 dst_release(&rt2
->u
.dst
);
740 dst_release(&rt1
->u
.dst
);
744 #if defined(CONFIG_NF_CONNTRACK_IPV6) || \
745 defined(CONFIG_NF_CONNTRACK_IPV6_MODULE)
747 struct rt6_info
*rt1
, *rt2
;
749 memcpy(&fl1
.fl6_dst
, src
, sizeof(fl1
.fl6_dst
));
750 memcpy(&fl2
.fl6_dst
, dst
, sizeof(fl2
.fl6_dst
));
751 if (!afinfo
->route((struct dst_entry
**)&rt1
, &fl1
)) {
752 if (!afinfo
->route((struct dst_entry
**)&rt2
, &fl2
)) {
753 if (!memcmp(&rt1
->rt6i_gateway
, &rt2
->rt6i_gateway
,
754 sizeof(rt1
->rt6i_gateway
)) &&
755 rt1
->u
.dst
.dev
== rt2
->u
.dst
.dev
)
757 dst_release(&rt2
->u
.dst
);
759 dst_release(&rt1
->u
.dst
);
769 /****************************************************************************/
770 static int expect_callforwarding(struct sk_buff
*skb
,
772 enum ip_conntrack_info ctinfo
,
773 unsigned char **data
, int dataoff
,
774 TransportAddress
*taddr
)
776 int dir
= CTINFO2DIR(ctinfo
);
779 union nf_inet_addr addr
;
780 struct nf_conntrack_expect
*exp
;
781 typeof(nat_callforwarding_hook
) nat_callforwarding
;
783 /* Read alternativeAddress */
784 if (!get_h225_addr(ct
, *data
, taddr
, &addr
, &port
) || port
== 0)
787 /* If the calling party is on the same side of the forward-to party,
788 * we don't need to track the second call */
789 if (callforward_filter
&&
790 callforward_do_filter(&addr
, &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
792 pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
796 /* Create expect for the second call leg */
797 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
799 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
800 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
801 IPPROTO_TCP
, NULL
, &port
);
802 exp
->helper
= nf_conntrack_helper_q931
;
804 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
805 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
806 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
807 (nat_callforwarding
= rcu_dereference(nat_callforwarding_hook
)) &&
808 ct
->status
& IPS_NAT_MASK
) {
810 ret
= nat_callforwarding(skb
, ct
, ctinfo
, data
, dataoff
,
812 } else { /* Conntrack only */
813 if (nf_ct_expect_related(exp
) == 0) {
814 pr_debug("nf_ct_q931: expect Call Forwarding ");
815 nf_ct_dump_tuple(&exp
->tuple
);
820 nf_ct_expect_put(exp
);
825 /****************************************************************************/
826 static int process_setup(struct sk_buff
*skb
, struct nf_conn
*ct
,
827 enum ip_conntrack_info ctinfo
,
828 unsigned char **data
, int dataoff
,
831 int dir
= CTINFO2DIR(ctinfo
);
835 union nf_inet_addr addr
;
836 typeof(set_h225_addr_hook
) set_h225_addr
;
838 pr_debug("nf_ct_q931: Setup\n");
840 if (setup
->options
& eSetup_UUIE_h245Address
) {
841 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
842 &setup
->h245Address
);
847 set_h225_addr
= rcu_dereference(set_h225_addr_hook
);
848 if ((setup
->options
& eSetup_UUIE_destCallSignalAddress
) &&
849 (set_h225_addr
) && ct
->status
& IPS_NAT_MASK
&&
850 get_h225_addr(ct
, *data
, &setup
->destCallSignalAddress
,
852 memcmp(&addr
, &ct
->tuplehash
[!dir
].tuple
.src
.u3
, sizeof(addr
))) {
853 pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n",
854 &addr
, ntohs(port
), &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
855 ntohs(ct
->tuplehash
[!dir
].tuple
.src
.u
.tcp
.port
));
856 ret
= set_h225_addr(skb
, data
, dataoff
,
857 &setup
->destCallSignalAddress
,
858 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
859 ct
->tuplehash
[!dir
].tuple
.src
.u
.tcp
.port
);
864 if ((setup
->options
& eSetup_UUIE_sourceCallSignalAddress
) &&
865 (set_h225_addr
) && ct
->status
& IPS_NAT_MASK
&&
866 get_h225_addr(ct
, *data
, &setup
->sourceCallSignalAddress
,
868 memcmp(&addr
, &ct
->tuplehash
[!dir
].tuple
.dst
.u3
, sizeof(addr
))) {
869 pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n",
870 &addr
, ntohs(port
), &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
871 ntohs(ct
->tuplehash
[!dir
].tuple
.dst
.u
.tcp
.port
));
872 ret
= set_h225_addr(skb
, data
, dataoff
,
873 &setup
->sourceCallSignalAddress
,
874 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
875 ct
->tuplehash
[!dir
].tuple
.dst
.u
.tcp
.port
);
880 if (setup
->options
& eSetup_UUIE_fastStart
) {
881 for (i
= 0; i
< setup
->fastStart
.count
; i
++) {
882 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
883 &setup
->fastStart
.item
[i
]);
892 /****************************************************************************/
893 static int process_callproceeding(struct sk_buff
*skb
,
895 enum ip_conntrack_info ctinfo
,
896 unsigned char **data
, int dataoff
,
897 CallProceeding_UUIE
*callproc
)
902 pr_debug("nf_ct_q931: CallProceeding\n");
904 if (callproc
->options
& eCallProceeding_UUIE_h245Address
) {
905 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
906 &callproc
->h245Address
);
911 if (callproc
->options
& eCallProceeding_UUIE_fastStart
) {
912 for (i
= 0; i
< callproc
->fastStart
.count
; i
++) {
913 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
914 &callproc
->fastStart
.item
[i
]);
923 /****************************************************************************/
924 static int process_connect(struct sk_buff
*skb
, struct nf_conn
*ct
,
925 enum ip_conntrack_info ctinfo
,
926 unsigned char **data
, int dataoff
,
927 Connect_UUIE
*connect
)
932 pr_debug("nf_ct_q931: Connect\n");
934 if (connect
->options
& eConnect_UUIE_h245Address
) {
935 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
936 &connect
->h245Address
);
941 if (connect
->options
& eConnect_UUIE_fastStart
) {
942 for (i
= 0; i
< connect
->fastStart
.count
; i
++) {
943 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
944 &connect
->fastStart
.item
[i
]);
953 /****************************************************************************/
954 static int process_alerting(struct sk_buff
*skb
, struct nf_conn
*ct
,
955 enum ip_conntrack_info ctinfo
,
956 unsigned char **data
, int dataoff
,
957 Alerting_UUIE
*alert
)
962 pr_debug("nf_ct_q931: Alerting\n");
964 if (alert
->options
& eAlerting_UUIE_h245Address
) {
965 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
966 &alert
->h245Address
);
971 if (alert
->options
& eAlerting_UUIE_fastStart
) {
972 for (i
= 0; i
< alert
->fastStart
.count
; i
++) {
973 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
974 &alert
->fastStart
.item
[i
]);
983 /****************************************************************************/
984 static int process_facility(struct sk_buff
*skb
, struct nf_conn
*ct
,
985 enum ip_conntrack_info ctinfo
,
986 unsigned char **data
, int dataoff
,
987 Facility_UUIE
*facility
)
992 pr_debug("nf_ct_q931: Facility\n");
994 if (facility
->reason
.choice
== eFacilityReason_callForwarded
) {
995 if (facility
->options
& eFacility_UUIE_alternativeAddress
)
996 return expect_callforwarding(skb
, ct
, ctinfo
, data
,
1003 if (facility
->options
& eFacility_UUIE_h245Address
) {
1004 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
1005 &facility
->h245Address
);
1010 if (facility
->options
& eFacility_UUIE_fastStart
) {
1011 for (i
= 0; i
< facility
->fastStart
.count
; i
++) {
1012 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
1013 &facility
->fastStart
.item
[i
]);
1022 /****************************************************************************/
1023 static int process_progress(struct sk_buff
*skb
, struct nf_conn
*ct
,
1024 enum ip_conntrack_info ctinfo
,
1025 unsigned char **data
, int dataoff
,
1026 Progress_UUIE
*progress
)
1031 pr_debug("nf_ct_q931: Progress\n");
1033 if (progress
->options
& eProgress_UUIE_h245Address
) {
1034 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
1035 &progress
->h245Address
);
1040 if (progress
->options
& eProgress_UUIE_fastStart
) {
1041 for (i
= 0; i
< progress
->fastStart
.count
; i
++) {
1042 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
1043 &progress
->fastStart
.item
[i
]);
1052 /****************************************************************************/
1053 static int process_q931(struct sk_buff
*skb
, struct nf_conn
*ct
,
1054 enum ip_conntrack_info ctinfo
,
1055 unsigned char **data
, int dataoff
, Q931
*q931
)
1057 H323_UU_PDU
*pdu
= &q931
->UUIE
.h323_uu_pdu
;
1061 switch (pdu
->h323_message_body
.choice
) {
1062 case eH323_UU_PDU_h323_message_body_setup
:
1063 ret
= process_setup(skb
, ct
, ctinfo
, data
, dataoff
,
1064 &pdu
->h323_message_body
.setup
);
1066 case eH323_UU_PDU_h323_message_body_callProceeding
:
1067 ret
= process_callproceeding(skb
, ct
, ctinfo
, data
, dataoff
,
1068 &pdu
->h323_message_body
.
1071 case eH323_UU_PDU_h323_message_body_connect
:
1072 ret
= process_connect(skb
, ct
, ctinfo
, data
, dataoff
,
1073 &pdu
->h323_message_body
.connect
);
1075 case eH323_UU_PDU_h323_message_body_alerting
:
1076 ret
= process_alerting(skb
, ct
, ctinfo
, data
, dataoff
,
1077 &pdu
->h323_message_body
.alerting
);
1079 case eH323_UU_PDU_h323_message_body_facility
:
1080 ret
= process_facility(skb
, ct
, ctinfo
, data
, dataoff
,
1081 &pdu
->h323_message_body
.facility
);
1083 case eH323_UU_PDU_h323_message_body_progress
:
1084 ret
= process_progress(skb
, ct
, ctinfo
, data
, dataoff
,
1085 &pdu
->h323_message_body
.progress
);
1088 pr_debug("nf_ct_q931: Q.931 signal %d\n",
1089 pdu
->h323_message_body
.choice
);
1096 if (pdu
->options
& eH323_UU_PDU_h245Control
) {
1097 for (i
= 0; i
< pdu
->h245Control
.count
; i
++) {
1098 ret
= process_h245(skb
, ct
, ctinfo
, data
, dataoff
,
1099 &pdu
->h245Control
.item
[i
]);
1108 /****************************************************************************/
1109 static int q931_help(struct sk_buff
*skb
, unsigned int protoff
,
1110 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
1113 unsigned char *data
= NULL
;
1118 /* Until there's been traffic both ways, don't look in packets. */
1119 if (ctinfo
!= IP_CT_ESTABLISHED
&&
1120 ctinfo
!= IP_CT_ESTABLISHED
+ IP_CT_IS_REPLY
) {
1123 pr_debug("nf_ct_q931: skblen = %u\n", skb
->len
);
1125 spin_lock_bh(&nf_h323_lock
);
1127 /* Process each TPKT */
1128 while (get_tpkt_data(skb
, protoff
, ct
, ctinfo
,
1129 &data
, &datalen
, &dataoff
)) {
1130 pr_debug("nf_ct_q931: TPKT len=%d ", datalen
);
1131 nf_ct_dump_tuple(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
1133 /* Decode Q.931 signal */
1134 ret
= DecodeQ931(data
, datalen
, &q931
);
1136 pr_debug("nf_ct_q931: decoding error: %s\n",
1137 ret
== H323_ERROR_BOUND
?
1138 "out of bound" : "out of range");
1139 /* We don't drop when decoding error */
1143 /* Process Q.931 signal */
1144 if (process_q931(skb
, ct
, ctinfo
, &data
, dataoff
, &q931
) < 0)
1148 spin_unlock_bh(&nf_h323_lock
);
1152 spin_unlock_bh(&nf_h323_lock
);
1153 if (net_ratelimit())
1154 printk("nf_ct_q931: packet dropped\n");
1158 /****************************************************************************/
1159 static const struct nf_conntrack_expect_policy q931_exp_policy
= {
1160 /* T.120 and H.245 */
1161 .max_expected
= H323_RTP_CHANNEL_MAX
* 4 + 4,
1165 static struct nf_conntrack_helper nf_conntrack_helper_q931
[] __read_mostly
= {
1169 .tuple
.src
.l3num
= AF_INET
,
1170 .tuple
.src
.u
.tcp
.port
= __constant_htons(Q931_PORT
),
1171 .tuple
.dst
.protonum
= IPPROTO_TCP
,
1173 .expect_policy
= &q931_exp_policy
,
1178 .tuple
.src
.l3num
= AF_INET6
,
1179 .tuple
.src
.u
.tcp
.port
= __constant_htons(Q931_PORT
),
1180 .tuple
.dst
.protonum
= IPPROTO_TCP
,
1182 .expect_policy
= &q931_exp_policy
,
1186 /****************************************************************************/
1187 static unsigned char *get_udp_data(struct sk_buff
*skb
, unsigned int protoff
,
1190 const struct udphdr
*uh
;
1194 uh
= skb_header_pointer(skb
, protoff
, sizeof(_uh
), &_uh
);
1197 dataoff
= protoff
+ sizeof(_uh
);
1198 if (dataoff
>= skb
->len
)
1200 *datalen
= skb
->len
- dataoff
;
1201 return skb_header_pointer(skb
, dataoff
, *datalen
, h323_buffer
);
1204 /****************************************************************************/
1205 static struct nf_conntrack_expect
*find_expect(struct nf_conn
*ct
,
1206 union nf_inet_addr
*addr
,
1209 struct net
*net
= nf_ct_net(ct
);
1210 struct nf_conntrack_expect
*exp
;
1211 struct nf_conntrack_tuple tuple
;
1213 memset(&tuple
.src
.u3
, 0, sizeof(tuple
.src
.u3
));
1214 tuple
.src
.u
.tcp
.port
= 0;
1215 memcpy(&tuple
.dst
.u3
, addr
, sizeof(tuple
.dst
.u3
));
1216 tuple
.dst
.u
.tcp
.port
= port
;
1217 tuple
.dst
.protonum
= IPPROTO_TCP
;
1219 exp
= __nf_ct_expect_find(net
, &tuple
);
1220 if (exp
&& exp
->master
== ct
)
1225 /****************************************************************************/
1226 static int set_expect_timeout(struct nf_conntrack_expect
*exp
,
1229 if (!exp
|| !del_timer(&exp
->timeout
))
1232 exp
->timeout
.expires
= jiffies
+ timeout
* HZ
;
1233 add_timer(&exp
->timeout
);
1238 /****************************************************************************/
1239 static int expect_q931(struct sk_buff
*skb
, struct nf_conn
*ct
,
1240 enum ip_conntrack_info ctinfo
,
1241 unsigned char **data
,
1242 TransportAddress
*taddr
, int count
)
1244 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1245 int dir
= CTINFO2DIR(ctinfo
);
1249 union nf_inet_addr addr
;
1250 struct nf_conntrack_expect
*exp
;
1251 typeof(nat_q931_hook
) nat_q931
;
1253 /* Look for the first related address */
1254 for (i
= 0; i
< count
; i
++) {
1255 if (get_h225_addr(ct
, *data
, &taddr
[i
], &addr
, &port
) &&
1256 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
,
1257 sizeof(addr
)) == 0 && port
!= 0)
1261 if (i
>= count
) /* Not found */
1264 /* Create expect for Q.931 */
1265 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1267 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1268 gkrouted_only
? /* only accept calls from GK? */
1269 &ct
->tuplehash
[!dir
].tuple
.src
.u3
: NULL
,
1270 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1271 IPPROTO_TCP
, NULL
, &port
);
1272 exp
->helper
= nf_conntrack_helper_q931
;
1273 exp
->flags
= NF_CT_EXPECT_PERMANENT
; /* Accept multiple calls */
1275 nat_q931
= rcu_dereference(nat_q931_hook
);
1276 if (nat_q931
&& ct
->status
& IPS_NAT_MASK
) { /* Need NAT */
1277 ret
= nat_q931(skb
, ct
, ctinfo
, data
, taddr
, i
, port
, exp
);
1278 } else { /* Conntrack only */
1279 if (nf_ct_expect_related(exp
) == 0) {
1280 pr_debug("nf_ct_ras: expect Q.931 ");
1281 nf_ct_dump_tuple(&exp
->tuple
);
1283 /* Save port for looking up expect in processing RCF */
1284 info
->sig_port
[dir
] = port
;
1289 nf_ct_expect_put(exp
);
1294 /****************************************************************************/
1295 static int process_grq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1296 enum ip_conntrack_info ctinfo
,
1297 unsigned char **data
, GatekeeperRequest
*grq
)
1299 typeof(set_ras_addr_hook
) set_ras_addr
;
1301 pr_debug("nf_ct_ras: GRQ\n");
1303 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1304 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) /* NATed */
1305 return set_ras_addr(skb
, ct
, ctinfo
, data
,
1306 &grq
->rasAddress
, 1);
1310 /****************************************************************************/
1311 static int process_gcf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1312 enum ip_conntrack_info ctinfo
,
1313 unsigned char **data
, GatekeeperConfirm
*gcf
)
1315 int dir
= CTINFO2DIR(ctinfo
);
1318 union nf_inet_addr addr
;
1319 struct nf_conntrack_expect
*exp
;
1321 pr_debug("nf_ct_ras: GCF\n");
1323 if (!get_h225_addr(ct
, *data
, &gcf
->rasAddress
, &addr
, &port
))
1326 /* Registration port is the same as discovery port */
1327 if (!memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1328 port
== ct
->tuplehash
[dir
].tuple
.src
.u
.udp
.port
)
1331 /* Avoid RAS expectation loops. A GCF is never expected. */
1332 if (test_bit(IPS_EXPECTED_BIT
, &ct
->status
))
1335 /* Need new expect */
1336 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1338 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1339 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1340 IPPROTO_UDP
, NULL
, &port
);
1341 exp
->helper
= nf_conntrack_helper_ras
;
1343 if (nf_ct_expect_related(exp
) == 0) {
1344 pr_debug("nf_ct_ras: expect RAS ");
1345 nf_ct_dump_tuple(&exp
->tuple
);
1349 nf_ct_expect_put(exp
);
1354 /****************************************************************************/
1355 static int process_rrq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1356 enum ip_conntrack_info ctinfo
,
1357 unsigned char **data
, RegistrationRequest
*rrq
)
1359 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1361 typeof(set_ras_addr_hook
) set_ras_addr
;
1363 pr_debug("nf_ct_ras: RRQ\n");
1365 ret
= expect_q931(skb
, ct
, ctinfo
, data
,
1366 rrq
->callSignalAddress
.item
,
1367 rrq
->callSignalAddress
.count
);
1371 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1372 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) {
1373 ret
= set_ras_addr(skb
, ct
, ctinfo
, data
,
1374 rrq
->rasAddress
.item
,
1375 rrq
->rasAddress
.count
);
1380 if (rrq
->options
& eRegistrationRequest_timeToLive
) {
1381 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq
->timeToLive
);
1382 info
->timeout
= rrq
->timeToLive
;
1384 info
->timeout
= default_rrq_ttl
;
1389 /****************************************************************************/
1390 static int process_rcf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1391 enum ip_conntrack_info ctinfo
,
1392 unsigned char **data
, RegistrationConfirm
*rcf
)
1394 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1395 int dir
= CTINFO2DIR(ctinfo
);
1397 struct nf_conntrack_expect
*exp
;
1398 typeof(set_sig_addr_hook
) set_sig_addr
;
1400 pr_debug("nf_ct_ras: RCF\n");
1402 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1403 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1404 ret
= set_sig_addr(skb
, ct
, ctinfo
, data
,
1405 rcf
->callSignalAddress
.item
,
1406 rcf
->callSignalAddress
.count
);
1411 if (rcf
->options
& eRegistrationConfirm_timeToLive
) {
1412 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf
->timeToLive
);
1413 info
->timeout
= rcf
->timeToLive
;
1416 if (info
->timeout
> 0) {
1417 pr_debug("nf_ct_ras: set RAS connection timeout to "
1418 "%u seconds\n", info
->timeout
);
1419 nf_ct_refresh(ct
, skb
, info
->timeout
* HZ
);
1421 /* Set expect timeout */
1422 spin_lock_bh(&nf_conntrack_lock
);
1423 exp
= find_expect(ct
, &ct
->tuplehash
[dir
].tuple
.dst
.u3
,
1424 info
->sig_port
[!dir
]);
1426 pr_debug("nf_ct_ras: set Q.931 expect "
1427 "timeout to %u seconds for",
1429 nf_ct_dump_tuple(&exp
->tuple
);
1430 set_expect_timeout(exp
, info
->timeout
);
1432 spin_unlock_bh(&nf_conntrack_lock
);
1438 /****************************************************************************/
1439 static int process_urq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1440 enum ip_conntrack_info ctinfo
,
1441 unsigned char **data
, UnregistrationRequest
*urq
)
1443 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1444 int dir
= CTINFO2DIR(ctinfo
);
1446 typeof(set_sig_addr_hook
) set_sig_addr
;
1448 pr_debug("nf_ct_ras: URQ\n");
1450 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1451 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1452 ret
= set_sig_addr(skb
, ct
, ctinfo
, data
,
1453 urq
->callSignalAddress
.item
,
1454 urq
->callSignalAddress
.count
);
1459 /* Clear old expect */
1460 nf_ct_remove_expectations(ct
);
1461 info
->sig_port
[dir
] = 0;
1462 info
->sig_port
[!dir
] = 0;
1464 /* Give it 30 seconds for UCF or URJ */
1465 nf_ct_refresh(ct
, skb
, 30 * HZ
);
1470 /****************************************************************************/
1471 static int process_arq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1472 enum ip_conntrack_info ctinfo
,
1473 unsigned char **data
, AdmissionRequest
*arq
)
1475 const struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1476 int dir
= CTINFO2DIR(ctinfo
);
1478 union nf_inet_addr addr
;
1479 typeof(set_h225_addr_hook
) set_h225_addr
;
1481 pr_debug("nf_ct_ras: ARQ\n");
1483 set_h225_addr
= rcu_dereference(set_h225_addr_hook
);
1484 if ((arq
->options
& eAdmissionRequest_destCallSignalAddress
) &&
1485 get_h225_addr(ct
, *data
, &arq
->destCallSignalAddress
,
1487 !memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1488 port
== info
->sig_port
[dir
] &&
1489 set_h225_addr
&& ct
->status
& IPS_NAT_MASK
) {
1491 return set_h225_addr(skb
, data
, 0,
1492 &arq
->destCallSignalAddress
,
1493 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1494 info
->sig_port
[!dir
]);
1497 if ((arq
->options
& eAdmissionRequest_srcCallSignalAddress
) &&
1498 get_h225_addr(ct
, *data
, &arq
->srcCallSignalAddress
,
1500 !memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1501 set_h225_addr
&& ct
->status
& IPS_NAT_MASK
) {
1503 return set_h225_addr(skb
, data
, 0,
1504 &arq
->srcCallSignalAddress
,
1505 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1512 /****************************************************************************/
1513 static int process_acf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1514 enum ip_conntrack_info ctinfo
,
1515 unsigned char **data
, AdmissionConfirm
*acf
)
1517 int dir
= CTINFO2DIR(ctinfo
);
1520 union nf_inet_addr addr
;
1521 struct nf_conntrack_expect
*exp
;
1522 typeof(set_sig_addr_hook
) set_sig_addr
;
1524 pr_debug("nf_ct_ras: ACF\n");
1526 if (!get_h225_addr(ct
, *data
, &acf
->destCallSignalAddress
,
1530 if (!memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.dst
.u3
, sizeof(addr
))) {
1532 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1533 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
)
1534 return set_sig_addr(skb
, ct
, ctinfo
, data
,
1535 &acf
->destCallSignalAddress
, 1);
1539 /* Need new expect */
1540 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1542 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1543 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1544 IPPROTO_TCP
, NULL
, &port
);
1545 exp
->flags
= NF_CT_EXPECT_PERMANENT
;
1546 exp
->helper
= nf_conntrack_helper_q931
;
1548 if (nf_ct_expect_related(exp
) == 0) {
1549 pr_debug("nf_ct_ras: expect Q.931 ");
1550 nf_ct_dump_tuple(&exp
->tuple
);
1554 nf_ct_expect_put(exp
);
1559 /****************************************************************************/
1560 static int process_lrq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1561 enum ip_conntrack_info ctinfo
,
1562 unsigned char **data
, LocationRequest
*lrq
)
1564 typeof(set_ras_addr_hook
) set_ras_addr
;
1566 pr_debug("nf_ct_ras: LRQ\n");
1568 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1569 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
)
1570 return set_ras_addr(skb
, ct
, ctinfo
, data
,
1571 &lrq
->replyAddress
, 1);
1575 /****************************************************************************/
1576 static int process_lcf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1577 enum ip_conntrack_info ctinfo
,
1578 unsigned char **data
, LocationConfirm
*lcf
)
1580 int dir
= CTINFO2DIR(ctinfo
);
1583 union nf_inet_addr addr
;
1584 struct nf_conntrack_expect
*exp
;
1586 pr_debug("nf_ct_ras: LCF\n");
1588 if (!get_h225_addr(ct
, *data
, &lcf
->callSignalAddress
,
1592 /* Need new expect for call signal */
1593 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1595 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1596 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1597 IPPROTO_TCP
, NULL
, &port
);
1598 exp
->flags
= NF_CT_EXPECT_PERMANENT
;
1599 exp
->helper
= nf_conntrack_helper_q931
;
1601 if (nf_ct_expect_related(exp
) == 0) {
1602 pr_debug("nf_ct_ras: expect Q.931 ");
1603 nf_ct_dump_tuple(&exp
->tuple
);
1607 nf_ct_expect_put(exp
);
1609 /* Ignore rasAddress */
1614 /****************************************************************************/
1615 static int process_irr(struct sk_buff
*skb
, struct nf_conn
*ct
,
1616 enum ip_conntrack_info ctinfo
,
1617 unsigned char **data
, InfoRequestResponse
*irr
)
1620 typeof(set_ras_addr_hook
) set_ras_addr
;
1621 typeof(set_sig_addr_hook
) set_sig_addr
;
1623 pr_debug("nf_ct_ras: IRR\n");
1625 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1626 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) {
1627 ret
= set_ras_addr(skb
, ct
, ctinfo
, data
,
1628 &irr
->rasAddress
, 1);
1633 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1634 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1635 ret
= set_sig_addr(skb
, ct
, ctinfo
, data
,
1636 irr
->callSignalAddress
.item
,
1637 irr
->callSignalAddress
.count
);
1645 /****************************************************************************/
1646 static int process_ras(struct sk_buff
*skb
, struct nf_conn
*ct
,
1647 enum ip_conntrack_info ctinfo
,
1648 unsigned char **data
, RasMessage
*ras
)
1650 switch (ras
->choice
) {
1651 case eRasMessage_gatekeeperRequest
:
1652 return process_grq(skb
, ct
, ctinfo
, data
,
1653 &ras
->gatekeeperRequest
);
1654 case eRasMessage_gatekeeperConfirm
:
1655 return process_gcf(skb
, ct
, ctinfo
, data
,
1656 &ras
->gatekeeperConfirm
);
1657 case eRasMessage_registrationRequest
:
1658 return process_rrq(skb
, ct
, ctinfo
, data
,
1659 &ras
->registrationRequest
);
1660 case eRasMessage_registrationConfirm
:
1661 return process_rcf(skb
, ct
, ctinfo
, data
,
1662 &ras
->registrationConfirm
);
1663 case eRasMessage_unregistrationRequest
:
1664 return process_urq(skb
, ct
, ctinfo
, data
,
1665 &ras
->unregistrationRequest
);
1666 case eRasMessage_admissionRequest
:
1667 return process_arq(skb
, ct
, ctinfo
, data
,
1668 &ras
->admissionRequest
);
1669 case eRasMessage_admissionConfirm
:
1670 return process_acf(skb
, ct
, ctinfo
, data
,
1671 &ras
->admissionConfirm
);
1672 case eRasMessage_locationRequest
:
1673 return process_lrq(skb
, ct
, ctinfo
, data
,
1674 &ras
->locationRequest
);
1675 case eRasMessage_locationConfirm
:
1676 return process_lcf(skb
, ct
, ctinfo
, data
,
1677 &ras
->locationConfirm
);
1678 case eRasMessage_infoRequestResponse
:
1679 return process_irr(skb
, ct
, ctinfo
, data
,
1680 &ras
->infoRequestResponse
);
1682 pr_debug("nf_ct_ras: RAS message %d\n", ras
->choice
);
1689 /****************************************************************************/
1690 static int ras_help(struct sk_buff
*skb
, unsigned int protoff
,
1691 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
1693 static RasMessage ras
;
1694 unsigned char *data
;
1698 pr_debug("nf_ct_ras: skblen = %u\n", skb
->len
);
1700 spin_lock_bh(&nf_h323_lock
);
1703 data
= get_udp_data(skb
, protoff
, &datalen
);
1706 pr_debug("nf_ct_ras: RAS message len=%d ", datalen
);
1707 nf_ct_dump_tuple(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
1709 /* Decode RAS message */
1710 ret
= DecodeRasMessage(data
, datalen
, &ras
);
1712 pr_debug("nf_ct_ras: decoding error: %s\n",
1713 ret
== H323_ERROR_BOUND
?
1714 "out of bound" : "out of range");
1718 /* Process RAS message */
1719 if (process_ras(skb
, ct
, ctinfo
, &data
, &ras
) < 0)
1723 spin_unlock_bh(&nf_h323_lock
);
1727 spin_unlock_bh(&nf_h323_lock
);
1728 if (net_ratelimit())
1729 printk("nf_ct_ras: packet dropped\n");
1733 /****************************************************************************/
1734 static const struct nf_conntrack_expect_policy ras_exp_policy
= {
1739 static struct nf_conntrack_helper nf_conntrack_helper_ras
[] __read_mostly
= {
1743 .tuple
.src
.l3num
= AF_INET
,
1744 .tuple
.src
.u
.udp
.port
= __constant_htons(RAS_PORT
),
1745 .tuple
.dst
.protonum
= IPPROTO_UDP
,
1747 .expect_policy
= &ras_exp_policy
,
1752 .tuple
.src
.l3num
= AF_INET6
,
1753 .tuple
.src
.u
.udp
.port
= __constant_htons(RAS_PORT
),
1754 .tuple
.dst
.protonum
= IPPROTO_UDP
,
1756 .expect_policy
= &ras_exp_policy
,
1760 /****************************************************************************/
1761 static void __exit
nf_conntrack_h323_fini(void)
1763 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[1]);
1764 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[0]);
1765 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[1]);
1766 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[0]);
1767 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245
);
1769 pr_debug("nf_ct_h323: fini\n");
1772 /****************************************************************************/
1773 static int __init
nf_conntrack_h323_init(void)
1777 h323_buffer
= kmalloc(65536, GFP_KERNEL
);
1780 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_h245
);
1783 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_q931
[0]);
1786 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_q931
[1]);
1789 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_ras
[0]);
1792 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_ras
[1]);
1795 pr_debug("nf_ct_h323: init success\n");
1799 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[0]);
1801 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[1]);
1803 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[0]);
1805 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245
);
1811 /****************************************************************************/
1812 module_init(nf_conntrack_h323_init
);
1813 module_exit(nf_conntrack_h323_fini
);
1815 EXPORT_SYMBOL_GPL(get_h225_addr
);
1816 EXPORT_SYMBOL_GPL(set_h245_addr_hook
);
1817 EXPORT_SYMBOL_GPL(set_h225_addr_hook
);
1818 EXPORT_SYMBOL_GPL(set_sig_addr_hook
);
1819 EXPORT_SYMBOL_GPL(set_ras_addr_hook
);
1820 EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook
);
1821 EXPORT_SYMBOL_GPL(nat_t120_hook
);
1822 EXPORT_SYMBOL_GPL(nat_h245_hook
);
1823 EXPORT_SYMBOL_GPL(nat_callforwarding_hook
);
1824 EXPORT_SYMBOL_GPL(nat_q931_hook
);
1826 MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1827 MODULE_DESCRIPTION("H.323 connection tracking helper");
1828 MODULE_LICENSE("GPL");
1829 MODULE_ALIAS("ip_conntrack_h323");
1830 MODULE_ALIAS_NFCT_HELPER("h323");