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>
37 #define DEBUGP(format, args...)
41 static unsigned int default_rrq_ttl __read_mostly
= 300;
42 module_param(default_rrq_ttl
, uint
, 0600);
43 MODULE_PARM_DESC(default_rrq_ttl
, "use this TTL if it's missing in RRQ");
45 static int gkrouted_only __read_mostly
= 1;
46 module_param(gkrouted_only
, int, 0600);
47 MODULE_PARM_DESC(gkrouted_only
, "only accept calls from gatekeeper");
49 static int callforward_filter __read_mostly
= 1;
50 module_param(callforward_filter
, bool, 0600);
51 MODULE_PARM_DESC(callforward_filter
, "only create call forwarding expectations "
52 "if both endpoints are on different sides "
53 "(determined by routing information)");
56 int (*set_h245_addr_hook
) (struct sk_buff
**pskb
,
57 unsigned char **data
, int dataoff
,
58 H245_TransportAddress
*taddr
,
59 union nf_conntrack_address
*addr
, __be16 port
)
61 int (*set_h225_addr_hook
) (struct sk_buff
**pskb
,
62 unsigned char **data
, int dataoff
,
63 TransportAddress
*taddr
,
64 union nf_conntrack_address
*addr
, __be16 port
)
66 int (*set_sig_addr_hook
) (struct sk_buff
**pskb
,
68 enum ip_conntrack_info ctinfo
,
70 TransportAddress
*taddr
, int count
) __read_mostly
;
71 int (*set_ras_addr_hook
) (struct sk_buff
**pskb
,
73 enum ip_conntrack_info ctinfo
,
75 TransportAddress
*taddr
, int count
) __read_mostly
;
76 int (*nat_rtp_rtcp_hook
) (struct sk_buff
**pskb
,
78 enum ip_conntrack_info ctinfo
,
79 unsigned char **data
, int dataoff
,
80 H245_TransportAddress
*taddr
,
81 __be16 port
, __be16 rtp_port
,
82 struct nf_conntrack_expect
*rtp_exp
,
83 struct nf_conntrack_expect
*rtcp_exp
) __read_mostly
;
84 int (*nat_t120_hook
) (struct sk_buff
**pskb
,
86 enum ip_conntrack_info ctinfo
,
87 unsigned char **data
, int dataoff
,
88 H245_TransportAddress
*taddr
, __be16 port
,
89 struct nf_conntrack_expect
*exp
) __read_mostly
;
90 int (*nat_h245_hook
) (struct sk_buff
**pskb
,
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_callforwarding_hook
) (struct sk_buff
**pskb
,
98 enum ip_conntrack_info ctinfo
,
99 unsigned char **data
, int dataoff
,
100 TransportAddress
*taddr
, __be16 port
,
101 struct nf_conntrack_expect
*exp
) __read_mostly
;
102 int (*nat_q931_hook
) (struct sk_buff
**pskb
,
104 enum ip_conntrack_info ctinfo
,
105 unsigned char **data
, TransportAddress
*taddr
, int idx
,
106 __be16 port
, struct nf_conntrack_expect
*exp
)
109 static DEFINE_SPINLOCK(nf_h323_lock
);
110 static char *h323_buffer
;
112 static struct nf_conntrack_helper nf_conntrack_helper_h245
;
113 static struct nf_conntrack_helper nf_conntrack_helper_q931
[];
114 static struct nf_conntrack_helper nf_conntrack_helper_ras
[];
116 /****************************************************************************/
117 static int get_tpkt_data(struct sk_buff
**pskb
, unsigned int protoff
,
118 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
,
119 unsigned char **data
, int *datalen
, int *dataoff
)
121 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
122 int dir
= CTINFO2DIR(ctinfo
);
123 struct tcphdr _tcph
, *th
;
131 th
= skb_header_pointer(*pskb
, protoff
, sizeof(_tcph
), &_tcph
);
135 /* Get TCP data offset */
136 tcpdataoff
= protoff
+ th
->doff
* 4;
138 /* Get TCP data length */
139 tcpdatalen
= (*pskb
)->len
- tcpdataoff
;
140 if (tcpdatalen
<= 0) /* No TCP data */
143 if (*data
== NULL
) { /* first TPKT */
144 /* Get first TPKT pointer */
145 tpkt
= skb_header_pointer(*pskb
, tcpdataoff
, tcpdatalen
,
147 BUG_ON(tpkt
== NULL
);
149 /* Validate TPKT identifier */
150 if (tcpdatalen
< 4 || tpkt
[0] != 0x03 || tpkt
[1] != 0) {
151 /* Netmeeting sends TPKT header and data separately */
152 if (info
->tpkt_len
[dir
] > 0) {
153 DEBUGP("nf_ct_h323: previous packet "
154 "indicated separate TPKT data of %hu "
155 "bytes\n", info
->tpkt_len
[dir
]);
156 if (info
->tpkt_len
[dir
] <= tcpdatalen
) {
157 /* Yes, there was a TPKT header
160 *datalen
= info
->tpkt_len
[dir
];
165 /* Fragmented TPKT */
167 printk("nf_ct_h323: "
168 "fragmented TPKT\n");
172 /* It is not even a TPKT */
176 } else { /* Next TPKT */
177 tpktoff
= *dataoff
+ *datalen
;
178 tcpdatalen
-= tpktoff
;
179 if (tcpdatalen
<= 4) /* No more TPKT */
181 tpkt
= *data
+ *datalen
;
183 /* Validate TPKT identifier */
184 if (tpkt
[0] != 0x03 || tpkt
[1] != 0)
188 /* Validate TPKT length */
189 tpktlen
= tpkt
[2] * 256 + tpkt
[3];
192 if (tpktlen
> tcpdatalen
) {
193 if (tcpdatalen
== 4) { /* Separate TPKT header */
194 /* Netmeeting sends TPKT header and data separately */
195 DEBUGP("nf_ct_h323: separate TPKT header indicates "
196 "there will be TPKT data of %hu bytes\n",
198 info
->tpkt_len
[dir
] = tpktlen
- 4;
203 printk("nf_ct_h323: incomplete TPKT (fragmented?)\n");
207 /* This is the encapsulated data */
209 *datalen
= tpktlen
- 4;
210 *dataoff
= tpktoff
+ 4;
213 /* Clear TPKT length */
214 info
->tpkt_len
[dir
] = 0;
218 info
->tpkt_len
[dir
] = 0;
222 /****************************************************************************/
223 static int get_h245_addr(struct nf_conn
*ct
, unsigned char *data
,
224 H245_TransportAddress
*taddr
,
225 union nf_conntrack_address
*addr
, __be16
*port
)
228 int family
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
;
231 if (taddr
->choice
!= eH245_TransportAddress_unicastAddress
)
234 switch (taddr
->unicastAddress
.choice
) {
235 case eUnicastAddress_iPAddress
:
236 if (family
!= AF_INET
)
238 p
= data
+ taddr
->unicastAddress
.iPAddress
.network
;
241 case eUnicastAddress_iP6Address
:
242 if (family
!= AF_INET6
)
244 p
= data
+ taddr
->unicastAddress
.iP6Address
.network
;
251 memcpy(addr
, p
, len
);
252 memset((void *)addr
+ len
, 0, sizeof(*addr
) - len
);
253 memcpy(port
, p
+ len
, sizeof(__be16
));
258 /****************************************************************************/
259 static int expect_rtp_rtcp(struct sk_buff
**pskb
, struct nf_conn
*ct
,
260 enum ip_conntrack_info ctinfo
,
261 unsigned char **data
, int dataoff
,
262 H245_TransportAddress
*taddr
)
264 int dir
= CTINFO2DIR(ctinfo
);
267 __be16 rtp_port
, rtcp_port
;
268 union nf_conntrack_address addr
;
269 struct nf_conntrack_expect
*rtp_exp
;
270 struct nf_conntrack_expect
*rtcp_exp
;
271 typeof(nat_rtp_rtcp_hook
) nat_rtp_rtcp
;
273 /* Read RTP or RTCP address */
274 if (!get_h245_addr(ct
, *data
, taddr
, &addr
, &port
) ||
275 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) ||
279 /* RTP port is even */
282 rtcp_port
= htons(ntohs(port
) + 1);
284 /* Create expect for RTP */
285 if ((rtp_exp
= nf_conntrack_expect_alloc(ct
)) == NULL
)
287 nf_conntrack_expect_init(rtp_exp
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
288 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
289 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
290 IPPROTO_UDP
, NULL
, &rtp_port
);
292 /* Create expect for RTCP */
293 if ((rtcp_exp
= nf_conntrack_expect_alloc(ct
)) == NULL
) {
294 nf_conntrack_expect_put(rtp_exp
);
297 nf_conntrack_expect_init(rtcp_exp
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
298 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
299 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
300 IPPROTO_UDP
, NULL
, &rtcp_port
);
302 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
303 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
304 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
305 (nat_rtp_rtcp
= rcu_dereference(nat_rtp_rtcp_hook
)) &&
306 ct
->status
& IPS_NAT_MASK
) {
308 ret
= nat_rtp_rtcp(pskb
, ct
, ctinfo
, data
, dataoff
,
309 taddr
, port
, rtp_port
, rtp_exp
, rtcp_exp
);
310 } else { /* Conntrack only */
311 if (nf_conntrack_expect_related(rtp_exp
) == 0) {
312 if (nf_conntrack_expect_related(rtcp_exp
) == 0) {
313 DEBUGP("nf_ct_h323: expect RTP ");
314 NF_CT_DUMP_TUPLE(&rtp_exp
->tuple
);
315 DEBUGP("nf_ct_h323: expect RTCP ");
316 NF_CT_DUMP_TUPLE(&rtcp_exp
->tuple
);
318 nf_conntrack_unexpect_related(rtp_exp
);
325 nf_conntrack_expect_put(rtp_exp
);
326 nf_conntrack_expect_put(rtcp_exp
);
331 /****************************************************************************/
332 static int expect_t120(struct sk_buff
**pskb
,
334 enum ip_conntrack_info ctinfo
,
335 unsigned char **data
, int dataoff
,
336 H245_TransportAddress
*taddr
)
338 int dir
= CTINFO2DIR(ctinfo
);
341 union nf_conntrack_address addr
;
342 struct nf_conntrack_expect
*exp
;
343 typeof(nat_t120_hook
) nat_t120
;
345 /* Read T.120 address */
346 if (!get_h245_addr(ct
, *data
, taddr
, &addr
, &port
) ||
347 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) ||
351 /* Create expect for T.120 connections */
352 if ((exp
= nf_conntrack_expect_alloc(ct
)) == NULL
)
354 nf_conntrack_expect_init(exp
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
355 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
356 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
357 IPPROTO_TCP
, NULL
, &port
);
358 exp
->flags
= NF_CT_EXPECT_PERMANENT
; /* Accept multiple channels */
360 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
361 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
362 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
363 (nat_t120
= rcu_dereference(nat_t120_hook
)) &&
364 ct
->status
& IPS_NAT_MASK
) {
366 ret
= nat_t120(pskb
, ct
, ctinfo
, data
, dataoff
, taddr
,
368 } else { /* Conntrack only */
369 if (nf_conntrack_expect_related(exp
) == 0) {
370 DEBUGP("nf_ct_h323: expect T.120 ");
371 NF_CT_DUMP_TUPLE(&exp
->tuple
);
376 nf_conntrack_expect_put(exp
);
381 /****************************************************************************/
382 static int process_h245_channel(struct sk_buff
**pskb
,
384 enum ip_conntrack_info ctinfo
,
385 unsigned char **data
, int dataoff
,
386 H2250LogicalChannelParameters
*channel
)
390 if (channel
->options
& eH2250LogicalChannelParameters_mediaChannel
) {
392 ret
= expect_rtp_rtcp(pskb
, ct
, ctinfo
, data
, dataoff
,
393 &channel
->mediaChannel
);
399 options
& eH2250LogicalChannelParameters_mediaControlChannel
) {
401 ret
= expect_rtp_rtcp(pskb
, ct
, ctinfo
, data
, dataoff
,
402 &channel
->mediaControlChannel
);
410 /****************************************************************************/
411 static int process_olc(struct sk_buff
**pskb
, struct nf_conn
*ct
,
412 enum ip_conntrack_info ctinfo
,
413 unsigned char **data
, int dataoff
,
414 OpenLogicalChannel
*olc
)
418 DEBUGP("nf_ct_h323: OpenLogicalChannel\n");
420 if (olc
->forwardLogicalChannelParameters
.multiplexParameters
.choice
==
421 eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters
)
423 ret
= process_h245_channel(pskb
, ct
, ctinfo
, data
, dataoff
,
425 forwardLogicalChannelParameters
.
427 h2250LogicalChannelParameters
);
433 eOpenLogicalChannel_reverseLogicalChannelParameters
) &&
434 (olc
->reverseLogicalChannelParameters
.options
&
435 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters
)
436 && (olc
->reverseLogicalChannelParameters
.multiplexParameters
.
438 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters
))
441 process_h245_channel(pskb
, ct
, ctinfo
, data
, dataoff
,
443 reverseLogicalChannelParameters
.
445 h2250LogicalChannelParameters
);
450 if ((olc
->options
& eOpenLogicalChannel_separateStack
) &&
451 olc
->forwardLogicalChannelParameters
.dataType
.choice
==
453 olc
->forwardLogicalChannelParameters
.dataType
.data
.application
.
454 choice
== eDataApplicationCapability_application_t120
&&
455 olc
->forwardLogicalChannelParameters
.dataType
.data
.application
.
456 t120
.choice
== eDataProtocolCapability_separateLANStack
&&
457 olc
->separateStack
.networkAddress
.choice
==
458 eNetworkAccessParameters_networkAddress_localAreaAddress
) {
459 ret
= expect_t120(pskb
, ct
, ctinfo
, data
, dataoff
,
460 &olc
->separateStack
.networkAddress
.
469 /****************************************************************************/
470 static int process_olca(struct sk_buff
**pskb
, struct nf_conn
*ct
,
471 enum ip_conntrack_info ctinfo
,
472 unsigned char **data
, int dataoff
,
473 OpenLogicalChannelAck
*olca
)
475 H2250LogicalChannelAckParameters
*ack
;
478 DEBUGP("nf_ct_h323: OpenLogicalChannelAck\n");
481 eOpenLogicalChannelAck_reverseLogicalChannelParameters
) &&
482 (olca
->reverseLogicalChannelParameters
.options
&
483 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters
)
484 && (olca
->reverseLogicalChannelParameters
.multiplexParameters
.
486 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters
))
488 ret
= process_h245_channel(pskb
, ct
, ctinfo
, data
, dataoff
,
490 reverseLogicalChannelParameters
.
492 h2250LogicalChannelParameters
);
498 eOpenLogicalChannelAck_forwardMultiplexAckParameters
) &&
499 (olca
->forwardMultiplexAckParameters
.choice
==
500 eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters
))
502 ack
= &olca
->forwardMultiplexAckParameters
.
503 h2250LogicalChannelAckParameters
;
505 eH2250LogicalChannelAckParameters_mediaChannel
) {
507 ret
= expect_rtp_rtcp(pskb
, ct
, ctinfo
, data
, dataoff
,
514 eH2250LogicalChannelAckParameters_mediaControlChannel
) {
516 ret
= expect_rtp_rtcp(pskb
, ct
, ctinfo
, data
, dataoff
,
517 &ack
->mediaControlChannel
);
526 /****************************************************************************/
527 static int process_h245(struct sk_buff
**pskb
, struct nf_conn
*ct
,
528 enum ip_conntrack_info ctinfo
,
529 unsigned char **data
, int dataoff
,
530 MultimediaSystemControlMessage
*mscm
)
532 switch (mscm
->choice
) {
533 case eMultimediaSystemControlMessage_request
:
534 if (mscm
->request
.choice
==
535 eRequestMessage_openLogicalChannel
) {
536 return process_olc(pskb
, ct
, ctinfo
, data
, dataoff
,
537 &mscm
->request
.openLogicalChannel
);
539 DEBUGP("nf_ct_h323: H.245 Request %d\n",
540 mscm
->request
.choice
);
542 case eMultimediaSystemControlMessage_response
:
543 if (mscm
->response
.choice
==
544 eResponseMessage_openLogicalChannelAck
) {
545 return process_olca(pskb
, ct
, ctinfo
, data
, dataoff
,
547 openLogicalChannelAck
);
549 DEBUGP("nf_ct_h323: H.245 Response %d\n",
550 mscm
->response
.choice
);
553 DEBUGP("nf_ct_h323: H.245 signal %d\n", mscm
->choice
);
560 /****************************************************************************/
561 static int h245_help(struct sk_buff
**pskb
, unsigned int protoff
,
562 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
564 static MultimediaSystemControlMessage mscm
;
565 unsigned char *data
= NULL
;
570 /* Until there's been traffic both ways, don't look in packets. */
571 if (ctinfo
!= IP_CT_ESTABLISHED
&&
572 ctinfo
!= IP_CT_ESTABLISHED
+ IP_CT_IS_REPLY
) {
575 DEBUGP("nf_ct_h245: skblen = %u\n", (*pskb
)->len
);
577 spin_lock_bh(&nf_h323_lock
);
579 /* Process each TPKT */
580 while (get_tpkt_data(pskb
, protoff
, ct
, ctinfo
,
581 &data
, &datalen
, &dataoff
)) {
582 DEBUGP("nf_ct_h245: TPKT len=%d ", datalen
);
583 NF_CT_DUMP_TUPLE(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
585 /* Decode H.245 signal */
586 ret
= DecodeMultimediaSystemControlMessage(data
, datalen
,
590 printk("nf_ct_h245: decoding error: %s\n",
591 ret
== H323_ERROR_BOUND
?
592 "out of bound" : "out of range");
593 /* We don't drop when decoding error */
597 /* Process H.245 signal */
598 if (process_h245(pskb
, ct
, ctinfo
, &data
, dataoff
, &mscm
) < 0)
602 spin_unlock_bh(&nf_h323_lock
);
606 spin_unlock_bh(&nf_h323_lock
);
608 printk("nf_ct_h245: packet dropped\n");
612 /****************************************************************************/
613 static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly
= {
616 .max_expected
= H323_RTP_CHANNEL_MAX
* 4 + 2 /* T.120 */,
618 .tuple
.dst
.protonum
= IPPROTO_UDP
,
619 .mask
.src
.u
.udp
.port
= __constant_htons(0xFFFF),
620 .mask
.dst
.protonum
= 0xFF,
624 /****************************************************************************/
625 int get_h225_addr(struct nf_conn
*ct
, unsigned char *data
,
626 TransportAddress
*taddr
,
627 union nf_conntrack_address
*addr
, __be16
*port
)
630 int family
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
;
633 switch (taddr
->choice
) {
634 case eTransportAddress_ipAddress
:
635 if (family
!= AF_INET
)
637 p
= data
+ taddr
->ipAddress
.ip
;
640 case eTransportAddress_ip6Address
:
641 if (family
!= AF_INET6
)
643 p
= data
+ taddr
->ip6Address
.ip6
;
650 memcpy(addr
, p
, len
);
651 memset((void *)addr
+ len
, 0, sizeof(*addr
) - len
);
652 memcpy(port
, p
+ len
, sizeof(__be16
));
657 /****************************************************************************/
658 static int expect_h245(struct sk_buff
**pskb
, struct nf_conn
*ct
,
659 enum ip_conntrack_info ctinfo
,
660 unsigned char **data
, int dataoff
,
661 TransportAddress
*taddr
)
663 int dir
= CTINFO2DIR(ctinfo
);
666 union nf_conntrack_address addr
;
667 struct nf_conntrack_expect
*exp
;
668 typeof(nat_h245_hook
) nat_h245
;
670 /* Read h245Address */
671 if (!get_h225_addr(ct
, *data
, taddr
, &addr
, &port
) ||
672 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) ||
676 /* Create expect for h245 connection */
677 if ((exp
= nf_conntrack_expect_alloc(ct
)) == NULL
)
679 nf_conntrack_expect_init(exp
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
680 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
681 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
682 IPPROTO_TCP
, NULL
, &port
);
683 exp
->helper
= &nf_conntrack_helper_h245
;
685 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
686 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
687 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
688 (nat_h245
= rcu_dereference(nat_h245_hook
)) &&
689 ct
->status
& IPS_NAT_MASK
) {
691 ret
= nat_h245(pskb
, ct
, ctinfo
, data
, dataoff
, taddr
,
693 } else { /* Conntrack only */
694 if (nf_conntrack_expect_related(exp
) == 0) {
695 DEBUGP("nf_ct_q931: expect H.245 ");
696 NF_CT_DUMP_TUPLE(&exp
->tuple
);
701 nf_conntrack_expect_put(exp
);
706 /* If the calling party is on the same side of the forward-to party,
707 * we don't need to track the second call */
708 static int callforward_do_filter(union nf_conntrack_address
*src
,
709 union nf_conntrack_address
*dst
,
712 struct flowi fl1
, fl2
;
715 memset(&fl1
, 0, sizeof(fl1
));
716 memset(&fl2
, 0, sizeof(fl2
));
720 struct rtable
*rt1
, *rt2
;
722 fl1
.fl4_dst
= src
->ip
;
723 fl2
.fl4_dst
= dst
->ip
;
724 if (ip_route_output_key(&rt1
, &fl1
) == 0) {
725 if (ip_route_output_key(&rt2
, &fl2
) == 0) {
726 if (rt1
->rt_gateway
== rt2
->rt_gateway
&&
727 rt1
->u
.dst
.dev
== rt2
->u
.dst
.dev
)
729 dst_release(&rt2
->u
.dst
);
731 dst_release(&rt1
->u
.dst
);
735 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
737 struct rt6_info
*rt1
, *rt2
;
739 memcpy(&fl1
.fl6_dst
, src
, sizeof(fl1
.fl6_dst
));
740 memcpy(&fl2
.fl6_dst
, dst
, sizeof(fl2
.fl6_dst
));
741 rt1
= (struct rt6_info
*)ip6_route_output(NULL
, &fl1
);
743 rt2
= (struct rt6_info
*)ip6_route_output(NULL
, &fl2
);
745 if (!memcmp(&rt1
->rt6i_gateway
, &rt2
->rt6i_gateway
,
746 sizeof(rt1
->rt6i_gateway
)) &&
747 rt1
->u
.dst
.dev
== rt2
->u
.dst
.dev
)
749 dst_release(&rt2
->u
.dst
);
751 dst_release(&rt1
->u
.dst
);
761 /****************************************************************************/
762 static int expect_callforwarding(struct sk_buff
**pskb
,
764 enum ip_conntrack_info ctinfo
,
765 unsigned char **data
, int dataoff
,
766 TransportAddress
*taddr
)
768 int dir
= CTINFO2DIR(ctinfo
);
771 union nf_conntrack_address addr
;
772 struct nf_conntrack_expect
*exp
;
773 typeof(nat_callforwarding_hook
) nat_callforwarding
;
775 /* Read alternativeAddress */
776 if (!get_h225_addr(ct
, *data
, taddr
, &addr
, &port
) || port
== 0)
779 /* If the calling party is on the same side of the forward-to party,
780 * we don't need to track the second call */
781 if (callforward_filter
&&
782 callforward_do_filter(&addr
, &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
783 ct
->tuplehash
[!dir
].tuple
.src
.l3num
)) {
784 DEBUGP("nf_ct_q931: Call Forwarding not tracked\n");
788 /* Create expect for the second call leg */
789 if ((exp
= nf_conntrack_expect_alloc(ct
)) == NULL
)
791 nf_conntrack_expect_init(exp
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
792 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
793 IPPROTO_TCP
, NULL
, &port
);
794 exp
->helper
= nf_conntrack_helper_q931
;
796 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
797 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
798 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
799 (nat_callforwarding
= rcu_dereference(nat_callforwarding_hook
)) &&
800 ct
->status
& IPS_NAT_MASK
) {
802 ret
= nat_callforwarding(pskb
, ct
, ctinfo
, data
, dataoff
,
804 } else { /* Conntrack only */
805 if (nf_conntrack_expect_related(exp
) == 0) {
806 DEBUGP("nf_ct_q931: expect Call Forwarding ");
807 NF_CT_DUMP_TUPLE(&exp
->tuple
);
812 nf_conntrack_expect_put(exp
);
817 /****************************************************************************/
818 static int process_setup(struct sk_buff
**pskb
, struct nf_conn
*ct
,
819 enum ip_conntrack_info ctinfo
,
820 unsigned char **data
, int dataoff
,
823 int dir
= CTINFO2DIR(ctinfo
);
827 union nf_conntrack_address addr
;
828 typeof(set_h225_addr_hook
) set_h225_addr
;
830 DEBUGP("nf_ct_q931: Setup\n");
832 if (setup
->options
& eSetup_UUIE_h245Address
) {
833 ret
= expect_h245(pskb
, ct
, ctinfo
, data
, dataoff
,
834 &setup
->h245Address
);
839 set_h225_addr
= rcu_dereference(set_h225_addr_hook
);
840 if ((setup
->options
& eSetup_UUIE_destCallSignalAddress
) &&
841 (set_h225_addr
) && ct
->status
&& IPS_NAT_MASK
&&
842 get_h225_addr(ct
, *data
, &setup
->destCallSignalAddress
,
844 memcmp(&addr
, &ct
->tuplehash
[!dir
].tuple
.src
.u3
, sizeof(addr
))) {
845 DEBUGP("nf_ct_q931: set destCallSignalAddress "
846 NIP6_FMT
":%hu->" NIP6_FMT
":%hu\n",
847 NIP6(*(struct in6_addr
*)&addr
), ntohs(port
),
848 NIP6(*(struct in6_addr
*)&ct
->tuplehash
[!dir
].tuple
.src
.u3
),
849 ntohs(ct
->tuplehash
[!dir
].tuple
.src
.u
.tcp
.port
));
850 ret
= set_h225_addr(pskb
, data
, dataoff
,
851 &setup
->destCallSignalAddress
,
852 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
853 ct
->tuplehash
[!dir
].tuple
.src
.u
.tcp
.port
);
858 if ((setup
->options
& eSetup_UUIE_sourceCallSignalAddress
) &&
859 (set_h225_addr
) && ct
->status
& IPS_NAT_MASK
&&
860 get_h225_addr(ct
, *data
, &setup
->sourceCallSignalAddress
,
862 memcmp(&addr
, &ct
->tuplehash
[!dir
].tuple
.dst
.u3
, sizeof(addr
))) {
863 DEBUGP("nf_ct_q931: set sourceCallSignalAddress "
864 NIP6_FMT
":%hu->" NIP6_FMT
":%hu\n",
865 NIP6(*(struct in6_addr
*)&addr
), ntohs(port
),
866 NIP6(*(struct in6_addr
*)&ct
->tuplehash
[!dir
].tuple
.dst
.u3
),
867 ntohs(ct
->tuplehash
[!dir
].tuple
.dst
.u
.tcp
.port
));
868 ret
= set_h225_addr(pskb
, data
, dataoff
,
869 &setup
->sourceCallSignalAddress
,
870 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
871 ct
->tuplehash
[!dir
].tuple
.dst
.u
.tcp
.port
);
876 if (setup
->options
& eSetup_UUIE_fastStart
) {
877 for (i
= 0; i
< setup
->fastStart
.count
; i
++) {
878 ret
= process_olc(pskb
, ct
, ctinfo
, data
, dataoff
,
879 &setup
->fastStart
.item
[i
]);
888 /****************************************************************************/
889 static int process_callproceeding(struct sk_buff
**pskb
,
891 enum ip_conntrack_info ctinfo
,
892 unsigned char **data
, int dataoff
,
893 CallProceeding_UUIE
*callproc
)
898 DEBUGP("nf_ct_q931: CallProceeding\n");
900 if (callproc
->options
& eCallProceeding_UUIE_h245Address
) {
901 ret
= expect_h245(pskb
, ct
, ctinfo
, data
, dataoff
,
902 &callproc
->h245Address
);
907 if (callproc
->options
& eCallProceeding_UUIE_fastStart
) {
908 for (i
= 0; i
< callproc
->fastStart
.count
; i
++) {
909 ret
= process_olc(pskb
, ct
, ctinfo
, data
, dataoff
,
910 &callproc
->fastStart
.item
[i
]);
919 /****************************************************************************/
920 static int process_connect(struct sk_buff
**pskb
, struct nf_conn
*ct
,
921 enum ip_conntrack_info ctinfo
,
922 unsigned char **data
, int dataoff
,
923 Connect_UUIE
*connect
)
928 DEBUGP("nf_ct_q931: Connect\n");
930 if (connect
->options
& eConnect_UUIE_h245Address
) {
931 ret
= expect_h245(pskb
, ct
, ctinfo
, data
, dataoff
,
932 &connect
->h245Address
);
937 if (connect
->options
& eConnect_UUIE_fastStart
) {
938 for (i
= 0; i
< connect
->fastStart
.count
; i
++) {
939 ret
= process_olc(pskb
, ct
, ctinfo
, data
, dataoff
,
940 &connect
->fastStart
.item
[i
]);
949 /****************************************************************************/
950 static int process_alerting(struct sk_buff
**pskb
, struct nf_conn
*ct
,
951 enum ip_conntrack_info ctinfo
,
952 unsigned char **data
, int dataoff
,
953 Alerting_UUIE
*alert
)
958 DEBUGP("nf_ct_q931: Alerting\n");
960 if (alert
->options
& eAlerting_UUIE_h245Address
) {
961 ret
= expect_h245(pskb
, ct
, ctinfo
, data
, dataoff
,
962 &alert
->h245Address
);
967 if (alert
->options
& eAlerting_UUIE_fastStart
) {
968 for (i
= 0; i
< alert
->fastStart
.count
; i
++) {
969 ret
= process_olc(pskb
, ct
, ctinfo
, data
, dataoff
,
970 &alert
->fastStart
.item
[i
]);
979 /****************************************************************************/
980 static int process_information(struct sk_buff
**pskb
,
982 enum ip_conntrack_info ctinfo
,
983 unsigned char **data
, int dataoff
,
984 Information_UUIE
*info
)
989 DEBUGP("nf_ct_q931: Information\n");
991 if (info
->options
& eInformation_UUIE_fastStart
) {
992 for (i
= 0; i
< info
->fastStart
.count
; i
++) {
993 ret
= process_olc(pskb
, ct
, ctinfo
, data
, dataoff
,
994 &info
->fastStart
.item
[i
]);
1003 /****************************************************************************/
1004 static int process_facility(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1005 enum ip_conntrack_info ctinfo
,
1006 unsigned char **data
, int dataoff
,
1007 Facility_UUIE
*facility
)
1012 DEBUGP("nf_ct_q931: Facility\n");
1014 if (facility
->reason
.choice
== eFacilityReason_callForwarded
) {
1015 if (facility
->options
& eFacility_UUIE_alternativeAddress
)
1016 return expect_callforwarding(pskb
, ct
, ctinfo
, data
,
1019 alternativeAddress
);
1023 if (facility
->options
& eFacility_UUIE_h245Address
) {
1024 ret
= expect_h245(pskb
, ct
, ctinfo
, data
, dataoff
,
1025 &facility
->h245Address
);
1030 if (facility
->options
& eFacility_UUIE_fastStart
) {
1031 for (i
= 0; i
< facility
->fastStart
.count
; i
++) {
1032 ret
= process_olc(pskb
, ct
, ctinfo
, data
, dataoff
,
1033 &facility
->fastStart
.item
[i
]);
1042 /****************************************************************************/
1043 static int process_progress(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1044 enum ip_conntrack_info ctinfo
,
1045 unsigned char **data
, int dataoff
,
1046 Progress_UUIE
*progress
)
1051 DEBUGP("nf_ct_q931: Progress\n");
1053 if (progress
->options
& eProgress_UUIE_h245Address
) {
1054 ret
= expect_h245(pskb
, ct
, ctinfo
, data
, dataoff
,
1055 &progress
->h245Address
);
1060 if (progress
->options
& eProgress_UUIE_fastStart
) {
1061 for (i
= 0; i
< progress
->fastStart
.count
; i
++) {
1062 ret
= process_olc(pskb
, ct
, ctinfo
, data
, dataoff
,
1063 &progress
->fastStart
.item
[i
]);
1072 /****************************************************************************/
1073 static int process_q931(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1074 enum ip_conntrack_info ctinfo
,
1075 unsigned char **data
, int dataoff
, Q931
*q931
)
1077 H323_UU_PDU
*pdu
= &q931
->UUIE
.h323_uu_pdu
;
1081 switch (pdu
->h323_message_body
.choice
) {
1082 case eH323_UU_PDU_h323_message_body_setup
:
1083 ret
= process_setup(pskb
, ct
, ctinfo
, data
, dataoff
,
1084 &pdu
->h323_message_body
.setup
);
1086 case eH323_UU_PDU_h323_message_body_callProceeding
:
1087 ret
= process_callproceeding(pskb
, ct
, ctinfo
, data
, dataoff
,
1088 &pdu
->h323_message_body
.
1091 case eH323_UU_PDU_h323_message_body_connect
:
1092 ret
= process_connect(pskb
, ct
, ctinfo
, data
, dataoff
,
1093 &pdu
->h323_message_body
.connect
);
1095 case eH323_UU_PDU_h323_message_body_alerting
:
1096 ret
= process_alerting(pskb
, ct
, ctinfo
, data
, dataoff
,
1097 &pdu
->h323_message_body
.alerting
);
1099 case eH323_UU_PDU_h323_message_body_information
:
1100 ret
= process_information(pskb
, ct
, ctinfo
, data
, dataoff
,
1101 &pdu
->h323_message_body
.
1104 case eH323_UU_PDU_h323_message_body_facility
:
1105 ret
= process_facility(pskb
, ct
, ctinfo
, data
, dataoff
,
1106 &pdu
->h323_message_body
.facility
);
1108 case eH323_UU_PDU_h323_message_body_progress
:
1109 ret
= process_progress(pskb
, ct
, ctinfo
, data
, dataoff
,
1110 &pdu
->h323_message_body
.progress
);
1113 DEBUGP("nf_ct_q931: Q.931 signal %d\n",
1114 pdu
->h323_message_body
.choice
);
1121 if (pdu
->options
& eH323_UU_PDU_h245Control
) {
1122 for (i
= 0; i
< pdu
->h245Control
.count
; i
++) {
1123 ret
= process_h245(pskb
, ct
, ctinfo
, data
, dataoff
,
1124 &pdu
->h245Control
.item
[i
]);
1133 /****************************************************************************/
1134 static int q931_help(struct sk_buff
**pskb
, unsigned int protoff
,
1135 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
1138 unsigned char *data
= NULL
;
1143 /* Until there's been traffic both ways, don't look in packets. */
1144 if (ctinfo
!= IP_CT_ESTABLISHED
&&
1145 ctinfo
!= IP_CT_ESTABLISHED
+ IP_CT_IS_REPLY
) {
1148 DEBUGP("nf_ct_q931: skblen = %u\n", (*pskb
)->len
);
1150 spin_lock_bh(&nf_h323_lock
);
1152 /* Process each TPKT */
1153 while (get_tpkt_data(pskb
, protoff
, ct
, ctinfo
,
1154 &data
, &datalen
, &dataoff
)) {
1155 DEBUGP("nf_ct_q931: TPKT len=%d ", datalen
);
1156 NF_CT_DUMP_TUPLE(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
1158 /* Decode Q.931 signal */
1159 ret
= DecodeQ931(data
, datalen
, &q931
);
1161 if (net_ratelimit())
1162 printk("nf_ct_q931: decoding error: %s\n",
1163 ret
== H323_ERROR_BOUND
?
1164 "out of bound" : "out of range");
1165 /* We don't drop when decoding error */
1169 /* Process Q.931 signal */
1170 if (process_q931(pskb
, ct
, ctinfo
, &data
, dataoff
, &q931
) < 0)
1174 spin_unlock_bh(&nf_h323_lock
);
1178 spin_unlock_bh(&nf_h323_lock
);
1179 if (net_ratelimit())
1180 printk("nf_ct_q931: packet dropped\n");
1184 /****************************************************************************/
1185 static struct nf_conntrack_helper nf_conntrack_helper_q931
[] __read_mostly
= {
1189 /* T.120 and H.245 */
1190 .max_expected
= H323_RTP_CHANNEL_MAX
* 4 + 4,
1192 .tuple
.src
.l3num
= AF_INET
,
1193 .tuple
.src
.u
.tcp
.port
= __constant_htons(Q931_PORT
),
1194 .tuple
.dst
.protonum
= IPPROTO_TCP
,
1195 .mask
.src
.l3num
= 0xFFFF,
1196 .mask
.src
.u
.tcp
.port
= __constant_htons(0xFFFF),
1197 .mask
.dst
.protonum
= 0xFF,
1203 /* T.120 and H.245 */
1204 .max_expected
= H323_RTP_CHANNEL_MAX
* 4 + 4,
1206 .tuple
.src
.l3num
= AF_INET6
,
1207 .tuple
.src
.u
.tcp
.port
= __constant_htons(Q931_PORT
),
1208 .tuple
.dst
.protonum
= IPPROTO_TCP
,
1209 .mask
.src
.l3num
= 0xFFFF,
1210 .mask
.src
.u
.tcp
.port
= __constant_htons(0xFFFF),
1211 .mask
.dst
.protonum
= 0xFF,
1216 /****************************************************************************/
1217 static unsigned char *get_udp_data(struct sk_buff
**pskb
, unsigned int protoff
,
1220 struct udphdr _uh
, *uh
;
1223 uh
= skb_header_pointer(*pskb
, protoff
, sizeof(_uh
), &_uh
);
1226 dataoff
= protoff
+ sizeof(_uh
);
1227 if (dataoff
>= (*pskb
)->len
)
1229 *datalen
= (*pskb
)->len
- dataoff
;
1230 return skb_header_pointer(*pskb
, dataoff
, *datalen
, h323_buffer
);
1233 /****************************************************************************/
1234 static struct nf_conntrack_expect
*find_expect(struct nf_conn
*ct
,
1235 union nf_conntrack_address
*addr
,
1238 struct nf_conntrack_expect
*exp
;
1239 struct nf_conntrack_tuple tuple
;
1241 memset(&tuple
.src
.u3
, 0, sizeof(tuple
.src
.u3
));
1242 tuple
.src
.u
.tcp
.port
= 0;
1243 memcpy(&tuple
.dst
.u3
, addr
, sizeof(tuple
.dst
.u3
));
1244 tuple
.dst
.u
.tcp
.port
= port
;
1245 tuple
.dst
.protonum
= IPPROTO_TCP
;
1247 exp
= __nf_conntrack_expect_find(&tuple
);
1248 if (exp
&& exp
->master
== ct
)
1253 /****************************************************************************/
1254 static int set_expect_timeout(struct nf_conntrack_expect
*exp
,
1257 if (!exp
|| !del_timer(&exp
->timeout
))
1260 exp
->timeout
.expires
= jiffies
+ timeout
* HZ
;
1261 add_timer(&exp
->timeout
);
1266 /****************************************************************************/
1267 static int expect_q931(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1268 enum ip_conntrack_info ctinfo
,
1269 unsigned char **data
,
1270 TransportAddress
*taddr
, int count
)
1272 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1273 int dir
= CTINFO2DIR(ctinfo
);
1277 union nf_conntrack_address addr
;
1278 struct nf_conntrack_expect
*exp
;
1279 typeof(nat_q931_hook
) nat_q931
;
1281 /* Look for the first related address */
1282 for (i
= 0; i
< count
; i
++) {
1283 if (get_h225_addr(ct
, *data
, &taddr
[i
], &addr
, &port
) &&
1284 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
,
1285 sizeof(addr
)) == 0 && port
!= 0)
1289 if (i
>= count
) /* Not found */
1292 /* Create expect for Q.931 */
1293 if ((exp
= nf_conntrack_expect_alloc(ct
)) == NULL
)
1295 nf_conntrack_expect_init(exp
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
1296 gkrouted_only
? /* only accept calls from GK? */
1297 &ct
->tuplehash
[!dir
].tuple
.src
.u3
:
1299 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1300 IPPROTO_TCP
, NULL
, &port
);
1301 exp
->helper
= nf_conntrack_helper_q931
;
1302 exp
->flags
= NF_CT_EXPECT_PERMANENT
; /* Accept multiple calls */
1304 nat_q931
= rcu_dereference(nat_q931_hook
);
1305 if (nat_q931
&& ct
->status
& IPS_NAT_MASK
) { /* Need NAT */
1306 ret
= nat_q931(pskb
, ct
, ctinfo
, data
, taddr
, i
, port
, exp
);
1307 } else { /* Conntrack only */
1308 if (nf_conntrack_expect_related(exp
) == 0) {
1309 DEBUGP("nf_ct_ras: expect Q.931 ");
1310 NF_CT_DUMP_TUPLE(&exp
->tuple
);
1312 /* Save port for looking up expect in processing RCF */
1313 info
->sig_port
[dir
] = port
;
1318 nf_conntrack_expect_put(exp
);
1323 /****************************************************************************/
1324 static int process_grq(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1325 enum ip_conntrack_info ctinfo
,
1326 unsigned char **data
, GatekeeperRequest
*grq
)
1328 typeof(set_ras_addr_hook
) set_ras_addr
;
1330 DEBUGP("nf_ct_ras: GRQ\n");
1332 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1333 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) /* NATed */
1334 return set_ras_addr(pskb
, ct
, ctinfo
, data
,
1335 &grq
->rasAddress
, 1);
1339 /****************************************************************************/
1340 static int process_gcf(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1341 enum ip_conntrack_info ctinfo
,
1342 unsigned char **data
, GatekeeperConfirm
*gcf
)
1344 int dir
= CTINFO2DIR(ctinfo
);
1347 union nf_conntrack_address addr
;
1348 struct nf_conntrack_expect
*exp
;
1350 DEBUGP("nf_ct_ras: GCF\n");
1352 if (!get_h225_addr(ct
, *data
, &gcf
->rasAddress
, &addr
, &port
))
1355 /* Registration port is the same as discovery port */
1356 if (!memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1357 port
== ct
->tuplehash
[dir
].tuple
.src
.u
.udp
.port
)
1360 /* Avoid RAS expectation loops. A GCF is never expected. */
1361 if (test_bit(IPS_EXPECTED_BIT
, &ct
->status
))
1364 /* Need new expect */
1365 if ((exp
= nf_conntrack_expect_alloc(ct
)) == NULL
)
1367 nf_conntrack_expect_init(exp
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
1368 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1369 IPPROTO_UDP
, NULL
, &port
);
1370 exp
->helper
= nf_conntrack_helper_ras
;
1372 if (nf_conntrack_expect_related(exp
) == 0) {
1373 DEBUGP("nf_ct_ras: expect RAS ");
1374 NF_CT_DUMP_TUPLE(&exp
->tuple
);
1378 nf_conntrack_expect_put(exp
);
1383 /****************************************************************************/
1384 static int process_rrq(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1385 enum ip_conntrack_info ctinfo
,
1386 unsigned char **data
, RegistrationRequest
*rrq
)
1388 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1390 typeof(set_ras_addr_hook
) set_ras_addr
;
1392 DEBUGP("nf_ct_ras: RRQ\n");
1394 ret
= expect_q931(pskb
, ct
, ctinfo
, data
,
1395 rrq
->callSignalAddress
.item
,
1396 rrq
->callSignalAddress
.count
);
1400 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1401 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) {
1402 ret
= set_ras_addr(pskb
, ct
, ctinfo
, data
,
1403 rrq
->rasAddress
.item
,
1404 rrq
->rasAddress
.count
);
1409 if (rrq
->options
& eRegistrationRequest_timeToLive
) {
1410 DEBUGP("nf_ct_ras: RRQ TTL = %u seconds\n", rrq
->timeToLive
);
1411 info
->timeout
= rrq
->timeToLive
;
1413 info
->timeout
= default_rrq_ttl
;
1418 /****************************************************************************/
1419 static int process_rcf(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1420 enum ip_conntrack_info ctinfo
,
1421 unsigned char **data
, RegistrationConfirm
*rcf
)
1423 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1424 int dir
= CTINFO2DIR(ctinfo
);
1426 struct nf_conntrack_expect
*exp
;
1427 typeof(set_sig_addr_hook
) set_sig_addr
;
1429 DEBUGP("nf_ct_ras: RCF\n");
1431 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1432 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1433 ret
= set_sig_addr(pskb
, ct
, ctinfo
, data
,
1434 rcf
->callSignalAddress
.item
,
1435 rcf
->callSignalAddress
.count
);
1440 if (rcf
->options
& eRegistrationConfirm_timeToLive
) {
1441 DEBUGP("nf_ct_ras: RCF TTL = %u seconds\n", rcf
->timeToLive
);
1442 info
->timeout
= rcf
->timeToLive
;
1445 if (info
->timeout
> 0) {
1447 ("nf_ct_ras: set RAS connection timeout to %u seconds\n",
1449 nf_ct_refresh(ct
, *pskb
, info
->timeout
* HZ
);
1451 /* Set expect timeout */
1452 read_lock_bh(&nf_conntrack_lock
);
1453 exp
= find_expect(ct
, &ct
->tuplehash
[dir
].tuple
.dst
.u3
,
1454 info
->sig_port
[!dir
]);
1456 DEBUGP("nf_ct_ras: set Q.931 expect "
1457 "timeout to %u seconds for",
1459 NF_CT_DUMP_TUPLE(&exp
->tuple
);
1460 set_expect_timeout(exp
, info
->timeout
);
1462 read_unlock_bh(&nf_conntrack_lock
);
1468 /****************************************************************************/
1469 static int process_urq(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1470 enum ip_conntrack_info ctinfo
,
1471 unsigned char **data
, UnregistrationRequest
*urq
)
1473 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1474 int dir
= CTINFO2DIR(ctinfo
);
1476 typeof(set_sig_addr_hook
) set_sig_addr
;
1478 DEBUGP("nf_ct_ras: URQ\n");
1480 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1481 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1482 ret
= set_sig_addr(pskb
, ct
, ctinfo
, data
,
1483 urq
->callSignalAddress
.item
,
1484 urq
->callSignalAddress
.count
);
1489 /* Clear old expect */
1490 nf_ct_remove_expectations(ct
);
1491 info
->sig_port
[dir
] = 0;
1492 info
->sig_port
[!dir
] = 0;
1494 /* Give it 30 seconds for UCF or URJ */
1495 nf_ct_refresh(ct
, *pskb
, 30 * HZ
);
1500 /****************************************************************************/
1501 static int process_arq(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1502 enum ip_conntrack_info ctinfo
,
1503 unsigned char **data
, AdmissionRequest
*arq
)
1505 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1506 int dir
= CTINFO2DIR(ctinfo
);
1508 union nf_conntrack_address addr
;
1509 typeof(set_h225_addr_hook
) set_h225_addr
;
1511 DEBUGP("nf_ct_ras: ARQ\n");
1513 set_h225_addr
= rcu_dereference(set_h225_addr_hook
);
1514 if ((arq
->options
& eAdmissionRequest_destCallSignalAddress
) &&
1515 get_h225_addr(ct
, *data
, &arq
->destCallSignalAddress
,
1517 !memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1518 port
== info
->sig_port
[dir
] &&
1519 set_h225_addr
&& ct
->status
& IPS_NAT_MASK
) {
1521 return set_h225_addr(pskb
, data
, 0,
1522 &arq
->destCallSignalAddress
,
1523 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1524 info
->sig_port
[!dir
]);
1527 if ((arq
->options
& eAdmissionRequest_srcCallSignalAddress
) &&
1528 get_h225_addr(ct
, *data
, &arq
->srcCallSignalAddress
,
1530 !memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1531 set_h225_addr
&& ct
->status
& IPS_NAT_MASK
) {
1533 return set_h225_addr(pskb
, data
, 0,
1534 &arq
->srcCallSignalAddress
,
1535 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1542 /****************************************************************************/
1543 static int process_acf(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1544 enum ip_conntrack_info ctinfo
,
1545 unsigned char **data
, AdmissionConfirm
*acf
)
1547 int dir
= CTINFO2DIR(ctinfo
);
1550 union nf_conntrack_address addr
;
1551 struct nf_conntrack_expect
*exp
;
1552 typeof(set_sig_addr_hook
) set_sig_addr
;
1554 DEBUGP("nf_ct_ras: ACF\n");
1556 if (!get_h225_addr(ct
, *data
, &acf
->destCallSignalAddress
,
1560 if (!memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.dst
.u3
, sizeof(addr
))) {
1562 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1563 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
)
1564 return set_sig_addr(pskb
, ct
, ctinfo
, data
,
1565 &acf
->destCallSignalAddress
, 1);
1569 /* Need new expect */
1570 if ((exp
= nf_conntrack_expect_alloc(ct
)) == NULL
)
1572 nf_conntrack_expect_init(exp
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
1573 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1574 IPPROTO_TCP
, NULL
, &port
);
1575 exp
->flags
= NF_CT_EXPECT_PERMANENT
;
1576 exp
->helper
= nf_conntrack_helper_q931
;
1578 if (nf_conntrack_expect_related(exp
) == 0) {
1579 DEBUGP("nf_ct_ras: expect Q.931 ");
1580 NF_CT_DUMP_TUPLE(&exp
->tuple
);
1584 nf_conntrack_expect_put(exp
);
1589 /****************************************************************************/
1590 static int process_lrq(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1591 enum ip_conntrack_info ctinfo
,
1592 unsigned char **data
, LocationRequest
*lrq
)
1594 typeof(set_ras_addr_hook
) set_ras_addr
;
1596 DEBUGP("nf_ct_ras: LRQ\n");
1598 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1599 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
)
1600 return set_ras_addr(pskb
, ct
, ctinfo
, data
,
1601 &lrq
->replyAddress
, 1);
1605 /****************************************************************************/
1606 static int process_lcf(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1607 enum ip_conntrack_info ctinfo
,
1608 unsigned char **data
, LocationConfirm
*lcf
)
1610 int dir
= CTINFO2DIR(ctinfo
);
1613 union nf_conntrack_address addr
;
1614 struct nf_conntrack_expect
*exp
;
1616 DEBUGP("nf_ct_ras: LCF\n");
1618 if (!get_h225_addr(ct
, *data
, &lcf
->callSignalAddress
,
1622 /* Need new expect for call signal */
1623 if ((exp
= nf_conntrack_expect_alloc(ct
)) == NULL
)
1625 nf_conntrack_expect_init(exp
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
1626 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1627 IPPROTO_TCP
, NULL
, &port
);
1628 exp
->flags
= NF_CT_EXPECT_PERMANENT
;
1629 exp
->helper
= nf_conntrack_helper_q931
;
1631 if (nf_conntrack_expect_related(exp
) == 0) {
1632 DEBUGP("nf_ct_ras: expect Q.931 ");
1633 NF_CT_DUMP_TUPLE(&exp
->tuple
);
1637 nf_conntrack_expect_put(exp
);
1639 /* Ignore rasAddress */
1644 /****************************************************************************/
1645 static int process_irr(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1646 enum ip_conntrack_info ctinfo
,
1647 unsigned char **data
, InfoRequestResponse
*irr
)
1650 typeof(set_ras_addr_hook
) set_ras_addr
;
1651 typeof(set_sig_addr_hook
) set_sig_addr
;
1653 DEBUGP("nf_ct_ras: IRR\n");
1655 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1656 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) {
1657 ret
= set_ras_addr(pskb
, ct
, ctinfo
, data
,
1658 &irr
->rasAddress
, 1);
1663 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1664 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1665 ret
= set_sig_addr(pskb
, ct
, ctinfo
, data
,
1666 irr
->callSignalAddress
.item
,
1667 irr
->callSignalAddress
.count
);
1675 /****************************************************************************/
1676 static int process_ras(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1677 enum ip_conntrack_info ctinfo
,
1678 unsigned char **data
, RasMessage
*ras
)
1680 switch (ras
->choice
) {
1681 case eRasMessage_gatekeeperRequest
:
1682 return process_grq(pskb
, ct
, ctinfo
, data
,
1683 &ras
->gatekeeperRequest
);
1684 case eRasMessage_gatekeeperConfirm
:
1685 return process_gcf(pskb
, ct
, ctinfo
, data
,
1686 &ras
->gatekeeperConfirm
);
1687 case eRasMessage_registrationRequest
:
1688 return process_rrq(pskb
, ct
, ctinfo
, data
,
1689 &ras
->registrationRequest
);
1690 case eRasMessage_registrationConfirm
:
1691 return process_rcf(pskb
, ct
, ctinfo
, data
,
1692 &ras
->registrationConfirm
);
1693 case eRasMessage_unregistrationRequest
:
1694 return process_urq(pskb
, ct
, ctinfo
, data
,
1695 &ras
->unregistrationRequest
);
1696 case eRasMessage_admissionRequest
:
1697 return process_arq(pskb
, ct
, ctinfo
, data
,
1698 &ras
->admissionRequest
);
1699 case eRasMessage_admissionConfirm
:
1700 return process_acf(pskb
, ct
, ctinfo
, data
,
1701 &ras
->admissionConfirm
);
1702 case eRasMessage_locationRequest
:
1703 return process_lrq(pskb
, ct
, ctinfo
, data
,
1704 &ras
->locationRequest
);
1705 case eRasMessage_locationConfirm
:
1706 return process_lcf(pskb
, ct
, ctinfo
, data
,
1707 &ras
->locationConfirm
);
1708 case eRasMessage_infoRequestResponse
:
1709 return process_irr(pskb
, ct
, ctinfo
, data
,
1710 &ras
->infoRequestResponse
);
1712 DEBUGP("nf_ct_ras: RAS message %d\n", ras
->choice
);
1719 /****************************************************************************/
1720 static int ras_help(struct sk_buff
**pskb
, unsigned int protoff
,
1721 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
1723 static RasMessage ras
;
1724 unsigned char *data
;
1728 DEBUGP("nf_ct_ras: skblen = %u\n", (*pskb
)->len
);
1730 spin_lock_bh(&nf_h323_lock
);
1733 data
= get_udp_data(pskb
, protoff
, &datalen
);
1736 DEBUGP("nf_ct_ras: RAS message len=%d ", datalen
);
1737 NF_CT_DUMP_TUPLE(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
1739 /* Decode RAS message */
1740 ret
= DecodeRasMessage(data
, datalen
, &ras
);
1742 if (net_ratelimit())
1743 printk("nf_ct_ras: decoding error: %s\n",
1744 ret
== H323_ERROR_BOUND
?
1745 "out of bound" : "out of range");
1749 /* Process RAS message */
1750 if (process_ras(pskb
, ct
, ctinfo
, &data
, &ras
) < 0)
1754 spin_unlock_bh(&nf_h323_lock
);
1758 spin_unlock_bh(&nf_h323_lock
);
1759 if (net_ratelimit())
1760 printk("nf_ct_ras: packet dropped\n");
1764 /****************************************************************************/
1765 static struct nf_conntrack_helper nf_conntrack_helper_ras
[] __read_mostly
= {
1771 .tuple
.src
.l3num
= AF_INET
,
1772 .tuple
.src
.u
.udp
.port
= __constant_htons(RAS_PORT
),
1773 .tuple
.dst
.protonum
= IPPROTO_UDP
,
1774 .mask
.src
.l3num
= 0xFFFF,
1775 .mask
.src
.u
.udp
.port
= __constant_htons(0xFFFF),
1776 .mask
.dst
.protonum
= 0xFF,
1784 .tuple
.src
.l3num
= AF_INET6
,
1785 .tuple
.src
.u
.udp
.port
= __constant_htons(RAS_PORT
),
1786 .tuple
.dst
.protonum
= IPPROTO_UDP
,
1787 .mask
.src
.l3num
= 0xFFFF,
1788 .mask
.src
.u
.udp
.port
= __constant_htons(0xFFFF),
1789 .mask
.dst
.protonum
= 0xFF,
1794 /****************************************************************************/
1795 static void __exit
nf_conntrack_h323_fini(void)
1797 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[1]);
1798 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[0]);
1799 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[1]);
1800 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[0]);
1802 DEBUGP("nf_ct_h323: fini\n");
1805 /****************************************************************************/
1806 static int __init
nf_conntrack_h323_init(void)
1810 h323_buffer
= kmalloc(65536, GFP_KERNEL
);
1813 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_q931
[0]);
1816 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_q931
[1]);
1819 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_ras
[0]);
1822 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_ras
[1]);
1825 DEBUGP("nf_ct_h323: init success\n");
1829 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[0]);
1831 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[1]);
1833 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[0]);
1838 /****************************************************************************/
1839 module_init(nf_conntrack_h323_init
);
1840 module_exit(nf_conntrack_h323_fini
);
1842 EXPORT_SYMBOL_GPL(get_h225_addr
);
1843 EXPORT_SYMBOL_GPL(set_h245_addr_hook
);
1844 EXPORT_SYMBOL_GPL(set_h225_addr_hook
);
1845 EXPORT_SYMBOL_GPL(set_sig_addr_hook
);
1846 EXPORT_SYMBOL_GPL(set_ras_addr_hook
);
1847 EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook
);
1848 EXPORT_SYMBOL_GPL(nat_t120_hook
);
1849 EXPORT_SYMBOL_GPL(nat_h245_hook
);
1850 EXPORT_SYMBOL_GPL(nat_callforwarding_hook
);
1851 EXPORT_SYMBOL_GPL(nat_q931_hook
);
1853 MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1854 MODULE_DESCRIPTION("H.323 connection tracking helper");
1855 MODULE_LICENSE("GPL");
1856 MODULE_ALIAS("ip_conntrack_h323");