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
);
523 if ((olca
->options
& eOpenLogicalChannelAck_separateStack
) &&
524 olca
->separateStack
.networkAddress
.choice
==
525 eNetworkAccessParameters_networkAddress_localAreaAddress
) {
526 ret
= expect_t120(pskb
, ct
, ctinfo
, data
, dataoff
,
527 &olca
->separateStack
.networkAddress
.
536 /****************************************************************************/
537 static int process_h245(struct sk_buff
**pskb
, struct nf_conn
*ct
,
538 enum ip_conntrack_info ctinfo
,
539 unsigned char **data
, int dataoff
,
540 MultimediaSystemControlMessage
*mscm
)
542 switch (mscm
->choice
) {
543 case eMultimediaSystemControlMessage_request
:
544 if (mscm
->request
.choice
==
545 eRequestMessage_openLogicalChannel
) {
546 return process_olc(pskb
, ct
, ctinfo
, data
, dataoff
,
547 &mscm
->request
.openLogicalChannel
);
549 DEBUGP("nf_ct_h323: H.245 Request %d\n",
550 mscm
->request
.choice
);
552 case eMultimediaSystemControlMessage_response
:
553 if (mscm
->response
.choice
==
554 eResponseMessage_openLogicalChannelAck
) {
555 return process_olca(pskb
, ct
, ctinfo
, data
, dataoff
,
557 openLogicalChannelAck
);
559 DEBUGP("nf_ct_h323: H.245 Response %d\n",
560 mscm
->response
.choice
);
563 DEBUGP("nf_ct_h323: H.245 signal %d\n", mscm
->choice
);
570 /****************************************************************************/
571 static int h245_help(struct sk_buff
**pskb
, unsigned int protoff
,
572 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
574 static MultimediaSystemControlMessage mscm
;
575 unsigned char *data
= NULL
;
580 /* Until there's been traffic both ways, don't look in packets. */
581 if (ctinfo
!= IP_CT_ESTABLISHED
&&
582 ctinfo
!= IP_CT_ESTABLISHED
+ IP_CT_IS_REPLY
) {
585 DEBUGP("nf_ct_h245: skblen = %u\n", (*pskb
)->len
);
587 spin_lock_bh(&nf_h323_lock
);
589 /* Process each TPKT */
590 while (get_tpkt_data(pskb
, protoff
, ct
, ctinfo
,
591 &data
, &datalen
, &dataoff
)) {
592 DEBUGP("nf_ct_h245: TPKT len=%d ", datalen
);
593 NF_CT_DUMP_TUPLE(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
595 /* Decode H.245 signal */
596 ret
= DecodeMultimediaSystemControlMessage(data
, datalen
,
600 printk("nf_ct_h245: decoding error: %s\n",
601 ret
== H323_ERROR_BOUND
?
602 "out of bound" : "out of range");
603 /* We don't drop when decoding error */
607 /* Process H.245 signal */
608 if (process_h245(pskb
, ct
, ctinfo
, &data
, dataoff
, &mscm
) < 0)
612 spin_unlock_bh(&nf_h323_lock
);
616 spin_unlock_bh(&nf_h323_lock
);
618 printk("nf_ct_h245: packet dropped\n");
622 /****************************************************************************/
623 static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly
= {
626 .max_expected
= H323_RTP_CHANNEL_MAX
* 4 + 2 /* T.120 */,
628 .tuple
.dst
.protonum
= IPPROTO_UDP
,
629 .mask
.src
.u
.udp
.port
= __constant_htons(0xFFFF),
630 .mask
.dst
.protonum
= 0xFF,
634 /****************************************************************************/
635 int get_h225_addr(struct nf_conn
*ct
, unsigned char *data
,
636 TransportAddress
*taddr
,
637 union nf_conntrack_address
*addr
, __be16
*port
)
640 int family
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
;
643 switch (taddr
->choice
) {
644 case eTransportAddress_ipAddress
:
645 if (family
!= AF_INET
)
647 p
= data
+ taddr
->ipAddress
.ip
;
650 case eTransportAddress_ip6Address
:
651 if (family
!= AF_INET6
)
653 p
= data
+ taddr
->ip6Address
.ip
;
660 memcpy(addr
, p
, len
);
661 memset((void *)addr
+ len
, 0, sizeof(*addr
) - len
);
662 memcpy(port
, p
+ len
, sizeof(__be16
));
667 /****************************************************************************/
668 static int expect_h245(struct sk_buff
**pskb
, struct nf_conn
*ct
,
669 enum ip_conntrack_info ctinfo
,
670 unsigned char **data
, int dataoff
,
671 TransportAddress
*taddr
)
673 int dir
= CTINFO2DIR(ctinfo
);
676 union nf_conntrack_address addr
;
677 struct nf_conntrack_expect
*exp
;
678 typeof(nat_h245_hook
) nat_h245
;
680 /* Read h245Address */
681 if (!get_h225_addr(ct
, *data
, taddr
, &addr
, &port
) ||
682 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) ||
686 /* Create expect for h245 connection */
687 if ((exp
= nf_conntrack_expect_alloc(ct
)) == NULL
)
689 nf_conntrack_expect_init(exp
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
690 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
691 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
692 IPPROTO_TCP
, NULL
, &port
);
693 exp
->helper
= &nf_conntrack_helper_h245
;
695 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
696 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
697 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
698 (nat_h245
= rcu_dereference(nat_h245_hook
)) &&
699 ct
->status
& IPS_NAT_MASK
) {
701 ret
= nat_h245(pskb
, ct
, ctinfo
, data
, dataoff
, taddr
,
703 } else { /* Conntrack only */
704 if (nf_conntrack_expect_related(exp
) == 0) {
705 DEBUGP("nf_ct_q931: expect H.245 ");
706 NF_CT_DUMP_TUPLE(&exp
->tuple
);
711 nf_conntrack_expect_put(exp
);
716 /* If the calling party is on the same side of the forward-to party,
717 * we don't need to track the second call */
718 static int callforward_do_filter(union nf_conntrack_address
*src
,
719 union nf_conntrack_address
*dst
,
722 struct flowi fl1
, fl2
;
725 memset(&fl1
, 0, sizeof(fl1
));
726 memset(&fl2
, 0, sizeof(fl2
));
730 struct rtable
*rt1
, *rt2
;
732 fl1
.fl4_dst
= src
->ip
;
733 fl2
.fl4_dst
= dst
->ip
;
734 if (ip_route_output_key(&rt1
, &fl1
) == 0) {
735 if (ip_route_output_key(&rt2
, &fl2
) == 0) {
736 if (rt1
->rt_gateway
== rt2
->rt_gateway
&&
737 rt1
->u
.dst
.dev
== rt2
->u
.dst
.dev
)
739 dst_release(&rt2
->u
.dst
);
741 dst_release(&rt1
->u
.dst
);
745 #if defined(CONFIG_IPV6) || defined(CONFIG_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 rt1
= (struct rt6_info
*)ip6_route_output(NULL
, &fl1
);
753 rt2
= (struct rt6_info
*)ip6_route_output(NULL
, &fl2
);
755 if (!memcmp(&rt1
->rt6i_gateway
, &rt2
->rt6i_gateway
,
756 sizeof(rt1
->rt6i_gateway
)) &&
757 rt1
->u
.dst
.dev
== rt2
->u
.dst
.dev
)
759 dst_release(&rt2
->u
.dst
);
761 dst_release(&rt1
->u
.dst
);
771 /****************************************************************************/
772 static int expect_callforwarding(struct sk_buff
**pskb
,
774 enum ip_conntrack_info ctinfo
,
775 unsigned char **data
, int dataoff
,
776 TransportAddress
*taddr
)
778 int dir
= CTINFO2DIR(ctinfo
);
781 union nf_conntrack_address addr
;
782 struct nf_conntrack_expect
*exp
;
783 typeof(nat_callforwarding_hook
) nat_callforwarding
;
785 /* Read alternativeAddress */
786 if (!get_h225_addr(ct
, *data
, taddr
, &addr
, &port
) || port
== 0)
789 /* If the calling party is on the same side of the forward-to party,
790 * we don't need to track the second call */
791 if (callforward_filter
&&
792 callforward_do_filter(&addr
, &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
793 ct
->tuplehash
[!dir
].tuple
.src
.l3num
)) {
794 DEBUGP("nf_ct_q931: Call Forwarding not tracked\n");
798 /* Create expect for the second call leg */
799 if ((exp
= nf_conntrack_expect_alloc(ct
)) == NULL
)
801 nf_conntrack_expect_init(exp
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
802 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
803 IPPROTO_TCP
, NULL
, &port
);
804 exp
->helper
= nf_conntrack_helper_q931
;
806 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
807 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
808 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
809 (nat_callforwarding
= rcu_dereference(nat_callforwarding_hook
)) &&
810 ct
->status
& IPS_NAT_MASK
) {
812 ret
= nat_callforwarding(pskb
, ct
, ctinfo
, data
, dataoff
,
814 } else { /* Conntrack only */
815 if (nf_conntrack_expect_related(exp
) == 0) {
816 DEBUGP("nf_ct_q931: expect Call Forwarding ");
817 NF_CT_DUMP_TUPLE(&exp
->tuple
);
822 nf_conntrack_expect_put(exp
);
827 /****************************************************************************/
828 static int process_setup(struct sk_buff
**pskb
, struct nf_conn
*ct
,
829 enum ip_conntrack_info ctinfo
,
830 unsigned char **data
, int dataoff
,
833 int dir
= CTINFO2DIR(ctinfo
);
837 union nf_conntrack_address addr
;
838 typeof(set_h225_addr_hook
) set_h225_addr
;
840 DEBUGP("nf_ct_q931: Setup\n");
842 if (setup
->options
& eSetup_UUIE_h245Address
) {
843 ret
= expect_h245(pskb
, ct
, ctinfo
, data
, dataoff
,
844 &setup
->h245Address
);
849 set_h225_addr
= rcu_dereference(set_h225_addr_hook
);
850 if ((setup
->options
& eSetup_UUIE_destCallSignalAddress
) &&
851 (set_h225_addr
) && ct
->status
&& IPS_NAT_MASK
&&
852 get_h225_addr(ct
, *data
, &setup
->destCallSignalAddress
,
854 memcmp(&addr
, &ct
->tuplehash
[!dir
].tuple
.src
.u3
, sizeof(addr
))) {
855 DEBUGP("nf_ct_q931: set destCallSignalAddress "
856 NIP6_FMT
":%hu->" NIP6_FMT
":%hu\n",
857 NIP6(*(struct in6_addr
*)&addr
), ntohs(port
),
858 NIP6(*(struct in6_addr
*)&ct
->tuplehash
[!dir
].tuple
.src
.u3
),
859 ntohs(ct
->tuplehash
[!dir
].tuple
.src
.u
.tcp
.port
));
860 ret
= set_h225_addr(pskb
, data
, dataoff
,
861 &setup
->destCallSignalAddress
,
862 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
863 ct
->tuplehash
[!dir
].tuple
.src
.u
.tcp
.port
);
868 if ((setup
->options
& eSetup_UUIE_sourceCallSignalAddress
) &&
869 (set_h225_addr
) && ct
->status
& IPS_NAT_MASK
&&
870 get_h225_addr(ct
, *data
, &setup
->sourceCallSignalAddress
,
872 memcmp(&addr
, &ct
->tuplehash
[!dir
].tuple
.dst
.u3
, sizeof(addr
))) {
873 DEBUGP("nf_ct_q931: set sourceCallSignalAddress "
874 NIP6_FMT
":%hu->" NIP6_FMT
":%hu\n",
875 NIP6(*(struct in6_addr
*)&addr
), ntohs(port
),
876 NIP6(*(struct in6_addr
*)&ct
->tuplehash
[!dir
].tuple
.dst
.u3
),
877 ntohs(ct
->tuplehash
[!dir
].tuple
.dst
.u
.tcp
.port
));
878 ret
= set_h225_addr(pskb
, data
, dataoff
,
879 &setup
->sourceCallSignalAddress
,
880 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
881 ct
->tuplehash
[!dir
].tuple
.dst
.u
.tcp
.port
);
886 if (setup
->options
& eSetup_UUIE_fastStart
) {
887 for (i
= 0; i
< setup
->fastStart
.count
; i
++) {
888 ret
= process_olc(pskb
, ct
, ctinfo
, data
, dataoff
,
889 &setup
->fastStart
.item
[i
]);
898 /****************************************************************************/
899 static int process_callproceeding(struct sk_buff
**pskb
,
901 enum ip_conntrack_info ctinfo
,
902 unsigned char **data
, int dataoff
,
903 CallProceeding_UUIE
*callproc
)
908 DEBUGP("nf_ct_q931: CallProceeding\n");
910 if (callproc
->options
& eCallProceeding_UUIE_h245Address
) {
911 ret
= expect_h245(pskb
, ct
, ctinfo
, data
, dataoff
,
912 &callproc
->h245Address
);
917 if (callproc
->options
& eCallProceeding_UUIE_fastStart
) {
918 for (i
= 0; i
< callproc
->fastStart
.count
; i
++) {
919 ret
= process_olc(pskb
, ct
, ctinfo
, data
, dataoff
,
920 &callproc
->fastStart
.item
[i
]);
929 /****************************************************************************/
930 static int process_connect(struct sk_buff
**pskb
, struct nf_conn
*ct
,
931 enum ip_conntrack_info ctinfo
,
932 unsigned char **data
, int dataoff
,
933 Connect_UUIE
*connect
)
938 DEBUGP("nf_ct_q931: Connect\n");
940 if (connect
->options
& eConnect_UUIE_h245Address
) {
941 ret
= expect_h245(pskb
, ct
, ctinfo
, data
, dataoff
,
942 &connect
->h245Address
);
947 if (connect
->options
& eConnect_UUIE_fastStart
) {
948 for (i
= 0; i
< connect
->fastStart
.count
; i
++) {
949 ret
= process_olc(pskb
, ct
, ctinfo
, data
, dataoff
,
950 &connect
->fastStart
.item
[i
]);
959 /****************************************************************************/
960 static int process_alerting(struct sk_buff
**pskb
, struct nf_conn
*ct
,
961 enum ip_conntrack_info ctinfo
,
962 unsigned char **data
, int dataoff
,
963 Alerting_UUIE
*alert
)
968 DEBUGP("nf_ct_q931: Alerting\n");
970 if (alert
->options
& eAlerting_UUIE_h245Address
) {
971 ret
= expect_h245(pskb
, ct
, ctinfo
, data
, dataoff
,
972 &alert
->h245Address
);
977 if (alert
->options
& eAlerting_UUIE_fastStart
) {
978 for (i
= 0; i
< alert
->fastStart
.count
; i
++) {
979 ret
= process_olc(pskb
, ct
, ctinfo
, data
, dataoff
,
980 &alert
->fastStart
.item
[i
]);
989 /****************************************************************************/
990 static int process_facility(struct sk_buff
**pskb
, struct nf_conn
*ct
,
991 enum ip_conntrack_info ctinfo
,
992 unsigned char **data
, int dataoff
,
993 Facility_UUIE
*facility
)
998 DEBUGP("nf_ct_q931: Facility\n");
1000 if (facility
->reason
.choice
== eFacilityReason_callForwarded
) {
1001 if (facility
->options
& eFacility_UUIE_alternativeAddress
)
1002 return expect_callforwarding(pskb
, ct
, ctinfo
, data
,
1005 alternativeAddress
);
1009 if (facility
->options
& eFacility_UUIE_h245Address
) {
1010 ret
= expect_h245(pskb
, ct
, ctinfo
, data
, dataoff
,
1011 &facility
->h245Address
);
1016 if (facility
->options
& eFacility_UUIE_fastStart
) {
1017 for (i
= 0; i
< facility
->fastStart
.count
; i
++) {
1018 ret
= process_olc(pskb
, ct
, ctinfo
, data
, dataoff
,
1019 &facility
->fastStart
.item
[i
]);
1028 /****************************************************************************/
1029 static int process_progress(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1030 enum ip_conntrack_info ctinfo
,
1031 unsigned char **data
, int dataoff
,
1032 Progress_UUIE
*progress
)
1037 DEBUGP("nf_ct_q931: Progress\n");
1039 if (progress
->options
& eProgress_UUIE_h245Address
) {
1040 ret
= expect_h245(pskb
, ct
, ctinfo
, data
, dataoff
,
1041 &progress
->h245Address
);
1046 if (progress
->options
& eProgress_UUIE_fastStart
) {
1047 for (i
= 0; i
< progress
->fastStart
.count
; i
++) {
1048 ret
= process_olc(pskb
, ct
, ctinfo
, data
, dataoff
,
1049 &progress
->fastStart
.item
[i
]);
1058 /****************************************************************************/
1059 static int process_q931(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1060 enum ip_conntrack_info ctinfo
,
1061 unsigned char **data
, int dataoff
, Q931
*q931
)
1063 H323_UU_PDU
*pdu
= &q931
->UUIE
.h323_uu_pdu
;
1067 switch (pdu
->h323_message_body
.choice
) {
1068 case eH323_UU_PDU_h323_message_body_setup
:
1069 ret
= process_setup(pskb
, ct
, ctinfo
, data
, dataoff
,
1070 &pdu
->h323_message_body
.setup
);
1072 case eH323_UU_PDU_h323_message_body_callProceeding
:
1073 ret
= process_callproceeding(pskb
, ct
, ctinfo
, data
, dataoff
,
1074 &pdu
->h323_message_body
.
1077 case eH323_UU_PDU_h323_message_body_connect
:
1078 ret
= process_connect(pskb
, ct
, ctinfo
, data
, dataoff
,
1079 &pdu
->h323_message_body
.connect
);
1081 case eH323_UU_PDU_h323_message_body_alerting
:
1082 ret
= process_alerting(pskb
, ct
, ctinfo
, data
, dataoff
,
1083 &pdu
->h323_message_body
.alerting
);
1085 case eH323_UU_PDU_h323_message_body_facility
:
1086 ret
= process_facility(pskb
, ct
, ctinfo
, data
, dataoff
,
1087 &pdu
->h323_message_body
.facility
);
1089 case eH323_UU_PDU_h323_message_body_progress
:
1090 ret
= process_progress(pskb
, ct
, ctinfo
, data
, dataoff
,
1091 &pdu
->h323_message_body
.progress
);
1094 DEBUGP("nf_ct_q931: Q.931 signal %d\n",
1095 pdu
->h323_message_body
.choice
);
1102 if (pdu
->options
& eH323_UU_PDU_h245Control
) {
1103 for (i
= 0; i
< pdu
->h245Control
.count
; i
++) {
1104 ret
= process_h245(pskb
, ct
, ctinfo
, data
, dataoff
,
1105 &pdu
->h245Control
.item
[i
]);
1114 /****************************************************************************/
1115 static int q931_help(struct sk_buff
**pskb
, unsigned int protoff
,
1116 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
1119 unsigned char *data
= NULL
;
1124 /* Until there's been traffic both ways, don't look in packets. */
1125 if (ctinfo
!= IP_CT_ESTABLISHED
&&
1126 ctinfo
!= IP_CT_ESTABLISHED
+ IP_CT_IS_REPLY
) {
1129 DEBUGP("nf_ct_q931: skblen = %u\n", (*pskb
)->len
);
1131 spin_lock_bh(&nf_h323_lock
);
1133 /* Process each TPKT */
1134 while (get_tpkt_data(pskb
, protoff
, ct
, ctinfo
,
1135 &data
, &datalen
, &dataoff
)) {
1136 DEBUGP("nf_ct_q931: TPKT len=%d ", datalen
);
1137 NF_CT_DUMP_TUPLE(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
1139 /* Decode Q.931 signal */
1140 ret
= DecodeQ931(data
, datalen
, &q931
);
1142 if (net_ratelimit())
1143 printk("nf_ct_q931: decoding error: %s\n",
1144 ret
== H323_ERROR_BOUND
?
1145 "out of bound" : "out of range");
1146 /* We don't drop when decoding error */
1150 /* Process Q.931 signal */
1151 if (process_q931(pskb
, ct
, ctinfo
, &data
, dataoff
, &q931
) < 0)
1155 spin_unlock_bh(&nf_h323_lock
);
1159 spin_unlock_bh(&nf_h323_lock
);
1160 if (net_ratelimit())
1161 printk("nf_ct_q931: packet dropped\n");
1165 /****************************************************************************/
1166 static struct nf_conntrack_helper nf_conntrack_helper_q931
[] __read_mostly
= {
1170 /* T.120 and H.245 */
1171 .max_expected
= H323_RTP_CHANNEL_MAX
* 4 + 4,
1173 .tuple
.src
.l3num
= AF_INET
,
1174 .tuple
.src
.u
.tcp
.port
= __constant_htons(Q931_PORT
),
1175 .tuple
.dst
.protonum
= IPPROTO_TCP
,
1176 .mask
.src
.l3num
= 0xFFFF,
1177 .mask
.src
.u
.tcp
.port
= __constant_htons(0xFFFF),
1178 .mask
.dst
.protonum
= 0xFF,
1184 /* T.120 and H.245 */
1185 .max_expected
= H323_RTP_CHANNEL_MAX
* 4 + 4,
1187 .tuple
.src
.l3num
= AF_INET6
,
1188 .tuple
.src
.u
.tcp
.port
= __constant_htons(Q931_PORT
),
1189 .tuple
.dst
.protonum
= IPPROTO_TCP
,
1190 .mask
.src
.l3num
= 0xFFFF,
1191 .mask
.src
.u
.tcp
.port
= __constant_htons(0xFFFF),
1192 .mask
.dst
.protonum
= 0xFF,
1197 /****************************************************************************/
1198 static unsigned char *get_udp_data(struct sk_buff
**pskb
, unsigned int protoff
,
1201 struct udphdr _uh
, *uh
;
1204 uh
= skb_header_pointer(*pskb
, protoff
, sizeof(_uh
), &_uh
);
1207 dataoff
= protoff
+ sizeof(_uh
);
1208 if (dataoff
>= (*pskb
)->len
)
1210 *datalen
= (*pskb
)->len
- dataoff
;
1211 return skb_header_pointer(*pskb
, dataoff
, *datalen
, h323_buffer
);
1214 /****************************************************************************/
1215 static struct nf_conntrack_expect
*find_expect(struct nf_conn
*ct
,
1216 union nf_conntrack_address
*addr
,
1219 struct nf_conntrack_expect
*exp
;
1220 struct nf_conntrack_tuple tuple
;
1222 memset(&tuple
.src
.u3
, 0, sizeof(tuple
.src
.u3
));
1223 tuple
.src
.u
.tcp
.port
= 0;
1224 memcpy(&tuple
.dst
.u3
, addr
, sizeof(tuple
.dst
.u3
));
1225 tuple
.dst
.u
.tcp
.port
= port
;
1226 tuple
.dst
.protonum
= IPPROTO_TCP
;
1228 exp
= __nf_conntrack_expect_find(&tuple
);
1229 if (exp
&& exp
->master
== ct
)
1234 /****************************************************************************/
1235 static int set_expect_timeout(struct nf_conntrack_expect
*exp
,
1238 if (!exp
|| !del_timer(&exp
->timeout
))
1241 exp
->timeout
.expires
= jiffies
+ timeout
* HZ
;
1242 add_timer(&exp
->timeout
);
1247 /****************************************************************************/
1248 static int expect_q931(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1249 enum ip_conntrack_info ctinfo
,
1250 unsigned char **data
,
1251 TransportAddress
*taddr
, int count
)
1253 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1254 int dir
= CTINFO2DIR(ctinfo
);
1258 union nf_conntrack_address addr
;
1259 struct nf_conntrack_expect
*exp
;
1260 typeof(nat_q931_hook
) nat_q931
;
1262 /* Look for the first related address */
1263 for (i
= 0; i
< count
; i
++) {
1264 if (get_h225_addr(ct
, *data
, &taddr
[i
], &addr
, &port
) &&
1265 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
,
1266 sizeof(addr
)) == 0 && port
!= 0)
1270 if (i
>= count
) /* Not found */
1273 /* Create expect for Q.931 */
1274 if ((exp
= nf_conntrack_expect_alloc(ct
)) == NULL
)
1276 nf_conntrack_expect_init(exp
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
1277 gkrouted_only
? /* only accept calls from GK? */
1278 &ct
->tuplehash
[!dir
].tuple
.src
.u3
:
1280 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1281 IPPROTO_TCP
, NULL
, &port
);
1282 exp
->helper
= nf_conntrack_helper_q931
;
1283 exp
->flags
= NF_CT_EXPECT_PERMANENT
; /* Accept multiple calls */
1285 nat_q931
= rcu_dereference(nat_q931_hook
);
1286 if (nat_q931
&& ct
->status
& IPS_NAT_MASK
) { /* Need NAT */
1287 ret
= nat_q931(pskb
, ct
, ctinfo
, data
, taddr
, i
, port
, exp
);
1288 } else { /* Conntrack only */
1289 if (nf_conntrack_expect_related(exp
) == 0) {
1290 DEBUGP("nf_ct_ras: expect Q.931 ");
1291 NF_CT_DUMP_TUPLE(&exp
->tuple
);
1293 /* Save port for looking up expect in processing RCF */
1294 info
->sig_port
[dir
] = port
;
1299 nf_conntrack_expect_put(exp
);
1304 /****************************************************************************/
1305 static int process_grq(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1306 enum ip_conntrack_info ctinfo
,
1307 unsigned char **data
, GatekeeperRequest
*grq
)
1309 typeof(set_ras_addr_hook
) set_ras_addr
;
1311 DEBUGP("nf_ct_ras: GRQ\n");
1313 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1314 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) /* NATed */
1315 return set_ras_addr(pskb
, ct
, ctinfo
, data
,
1316 &grq
->rasAddress
, 1);
1320 /****************************************************************************/
1321 static int process_gcf(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1322 enum ip_conntrack_info ctinfo
,
1323 unsigned char **data
, GatekeeperConfirm
*gcf
)
1325 int dir
= CTINFO2DIR(ctinfo
);
1328 union nf_conntrack_address addr
;
1329 struct nf_conntrack_expect
*exp
;
1331 DEBUGP("nf_ct_ras: GCF\n");
1333 if (!get_h225_addr(ct
, *data
, &gcf
->rasAddress
, &addr
, &port
))
1336 /* Registration port is the same as discovery port */
1337 if (!memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1338 port
== ct
->tuplehash
[dir
].tuple
.src
.u
.udp
.port
)
1341 /* Avoid RAS expectation loops. A GCF is never expected. */
1342 if (test_bit(IPS_EXPECTED_BIT
, &ct
->status
))
1345 /* Need new expect */
1346 if ((exp
= nf_conntrack_expect_alloc(ct
)) == NULL
)
1348 nf_conntrack_expect_init(exp
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
1349 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1350 IPPROTO_UDP
, NULL
, &port
);
1351 exp
->helper
= nf_conntrack_helper_ras
;
1353 if (nf_conntrack_expect_related(exp
) == 0) {
1354 DEBUGP("nf_ct_ras: expect RAS ");
1355 NF_CT_DUMP_TUPLE(&exp
->tuple
);
1359 nf_conntrack_expect_put(exp
);
1364 /****************************************************************************/
1365 static int process_rrq(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1366 enum ip_conntrack_info ctinfo
,
1367 unsigned char **data
, RegistrationRequest
*rrq
)
1369 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1371 typeof(set_ras_addr_hook
) set_ras_addr
;
1373 DEBUGP("nf_ct_ras: RRQ\n");
1375 ret
= expect_q931(pskb
, ct
, ctinfo
, data
,
1376 rrq
->callSignalAddress
.item
,
1377 rrq
->callSignalAddress
.count
);
1381 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1382 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) {
1383 ret
= set_ras_addr(pskb
, ct
, ctinfo
, data
,
1384 rrq
->rasAddress
.item
,
1385 rrq
->rasAddress
.count
);
1390 if (rrq
->options
& eRegistrationRequest_timeToLive
) {
1391 DEBUGP("nf_ct_ras: RRQ TTL = %u seconds\n", rrq
->timeToLive
);
1392 info
->timeout
= rrq
->timeToLive
;
1394 info
->timeout
= default_rrq_ttl
;
1399 /****************************************************************************/
1400 static int process_rcf(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1401 enum ip_conntrack_info ctinfo
,
1402 unsigned char **data
, RegistrationConfirm
*rcf
)
1404 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1405 int dir
= CTINFO2DIR(ctinfo
);
1407 struct nf_conntrack_expect
*exp
;
1408 typeof(set_sig_addr_hook
) set_sig_addr
;
1410 DEBUGP("nf_ct_ras: RCF\n");
1412 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1413 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1414 ret
= set_sig_addr(pskb
, ct
, ctinfo
, data
,
1415 rcf
->callSignalAddress
.item
,
1416 rcf
->callSignalAddress
.count
);
1421 if (rcf
->options
& eRegistrationConfirm_timeToLive
) {
1422 DEBUGP("nf_ct_ras: RCF TTL = %u seconds\n", rcf
->timeToLive
);
1423 info
->timeout
= rcf
->timeToLive
;
1426 if (info
->timeout
> 0) {
1428 ("nf_ct_ras: set RAS connection timeout to %u seconds\n",
1430 nf_ct_refresh(ct
, *pskb
, info
->timeout
* HZ
);
1432 /* Set expect timeout */
1433 read_lock_bh(&nf_conntrack_lock
);
1434 exp
= find_expect(ct
, &ct
->tuplehash
[dir
].tuple
.dst
.u3
,
1435 info
->sig_port
[!dir
]);
1437 DEBUGP("nf_ct_ras: set Q.931 expect "
1438 "timeout to %u seconds for",
1440 NF_CT_DUMP_TUPLE(&exp
->tuple
);
1441 set_expect_timeout(exp
, info
->timeout
);
1443 read_unlock_bh(&nf_conntrack_lock
);
1449 /****************************************************************************/
1450 static int process_urq(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1451 enum ip_conntrack_info ctinfo
,
1452 unsigned char **data
, UnregistrationRequest
*urq
)
1454 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1455 int dir
= CTINFO2DIR(ctinfo
);
1457 typeof(set_sig_addr_hook
) set_sig_addr
;
1459 DEBUGP("nf_ct_ras: URQ\n");
1461 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1462 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1463 ret
= set_sig_addr(pskb
, ct
, ctinfo
, data
,
1464 urq
->callSignalAddress
.item
,
1465 urq
->callSignalAddress
.count
);
1470 /* Clear old expect */
1471 nf_ct_remove_expectations(ct
);
1472 info
->sig_port
[dir
] = 0;
1473 info
->sig_port
[!dir
] = 0;
1475 /* Give it 30 seconds for UCF or URJ */
1476 nf_ct_refresh(ct
, *pskb
, 30 * HZ
);
1481 /****************************************************************************/
1482 static int process_arq(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1483 enum ip_conntrack_info ctinfo
,
1484 unsigned char **data
, AdmissionRequest
*arq
)
1486 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1487 int dir
= CTINFO2DIR(ctinfo
);
1489 union nf_conntrack_address addr
;
1490 typeof(set_h225_addr_hook
) set_h225_addr
;
1492 DEBUGP("nf_ct_ras: ARQ\n");
1494 set_h225_addr
= rcu_dereference(set_h225_addr_hook
);
1495 if ((arq
->options
& eAdmissionRequest_destCallSignalAddress
) &&
1496 get_h225_addr(ct
, *data
, &arq
->destCallSignalAddress
,
1498 !memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1499 port
== info
->sig_port
[dir
] &&
1500 set_h225_addr
&& ct
->status
& IPS_NAT_MASK
) {
1502 return set_h225_addr(pskb
, data
, 0,
1503 &arq
->destCallSignalAddress
,
1504 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1505 info
->sig_port
[!dir
]);
1508 if ((arq
->options
& eAdmissionRequest_srcCallSignalAddress
) &&
1509 get_h225_addr(ct
, *data
, &arq
->srcCallSignalAddress
,
1511 !memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1512 set_h225_addr
&& ct
->status
& IPS_NAT_MASK
) {
1514 return set_h225_addr(pskb
, data
, 0,
1515 &arq
->srcCallSignalAddress
,
1516 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1523 /****************************************************************************/
1524 static int process_acf(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1525 enum ip_conntrack_info ctinfo
,
1526 unsigned char **data
, AdmissionConfirm
*acf
)
1528 int dir
= CTINFO2DIR(ctinfo
);
1531 union nf_conntrack_address addr
;
1532 struct nf_conntrack_expect
*exp
;
1533 typeof(set_sig_addr_hook
) set_sig_addr
;
1535 DEBUGP("nf_ct_ras: ACF\n");
1537 if (!get_h225_addr(ct
, *data
, &acf
->destCallSignalAddress
,
1541 if (!memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.dst
.u3
, sizeof(addr
))) {
1543 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1544 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
)
1545 return set_sig_addr(pskb
, ct
, ctinfo
, data
,
1546 &acf
->destCallSignalAddress
, 1);
1550 /* Need new expect */
1551 if ((exp
= nf_conntrack_expect_alloc(ct
)) == NULL
)
1553 nf_conntrack_expect_init(exp
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
1554 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1555 IPPROTO_TCP
, NULL
, &port
);
1556 exp
->flags
= NF_CT_EXPECT_PERMANENT
;
1557 exp
->helper
= nf_conntrack_helper_q931
;
1559 if (nf_conntrack_expect_related(exp
) == 0) {
1560 DEBUGP("nf_ct_ras: expect Q.931 ");
1561 NF_CT_DUMP_TUPLE(&exp
->tuple
);
1565 nf_conntrack_expect_put(exp
);
1570 /****************************************************************************/
1571 static int process_lrq(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1572 enum ip_conntrack_info ctinfo
,
1573 unsigned char **data
, LocationRequest
*lrq
)
1575 typeof(set_ras_addr_hook
) set_ras_addr
;
1577 DEBUGP("nf_ct_ras: LRQ\n");
1579 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1580 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
)
1581 return set_ras_addr(pskb
, ct
, ctinfo
, data
,
1582 &lrq
->replyAddress
, 1);
1586 /****************************************************************************/
1587 static int process_lcf(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1588 enum ip_conntrack_info ctinfo
,
1589 unsigned char **data
, LocationConfirm
*lcf
)
1591 int dir
= CTINFO2DIR(ctinfo
);
1594 union nf_conntrack_address addr
;
1595 struct nf_conntrack_expect
*exp
;
1597 DEBUGP("nf_ct_ras: LCF\n");
1599 if (!get_h225_addr(ct
, *data
, &lcf
->callSignalAddress
,
1603 /* Need new expect for call signal */
1604 if ((exp
= nf_conntrack_expect_alloc(ct
)) == NULL
)
1606 nf_conntrack_expect_init(exp
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
1607 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1608 IPPROTO_TCP
, NULL
, &port
);
1609 exp
->flags
= NF_CT_EXPECT_PERMANENT
;
1610 exp
->helper
= nf_conntrack_helper_q931
;
1612 if (nf_conntrack_expect_related(exp
) == 0) {
1613 DEBUGP("nf_ct_ras: expect Q.931 ");
1614 NF_CT_DUMP_TUPLE(&exp
->tuple
);
1618 nf_conntrack_expect_put(exp
);
1620 /* Ignore rasAddress */
1625 /****************************************************************************/
1626 static int process_irr(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1627 enum ip_conntrack_info ctinfo
,
1628 unsigned char **data
, InfoRequestResponse
*irr
)
1631 typeof(set_ras_addr_hook
) set_ras_addr
;
1632 typeof(set_sig_addr_hook
) set_sig_addr
;
1634 DEBUGP("nf_ct_ras: IRR\n");
1636 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1637 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) {
1638 ret
= set_ras_addr(pskb
, ct
, ctinfo
, data
,
1639 &irr
->rasAddress
, 1);
1644 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1645 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1646 ret
= set_sig_addr(pskb
, ct
, ctinfo
, data
,
1647 irr
->callSignalAddress
.item
,
1648 irr
->callSignalAddress
.count
);
1656 /****************************************************************************/
1657 static int process_ras(struct sk_buff
**pskb
, struct nf_conn
*ct
,
1658 enum ip_conntrack_info ctinfo
,
1659 unsigned char **data
, RasMessage
*ras
)
1661 switch (ras
->choice
) {
1662 case eRasMessage_gatekeeperRequest
:
1663 return process_grq(pskb
, ct
, ctinfo
, data
,
1664 &ras
->gatekeeperRequest
);
1665 case eRasMessage_gatekeeperConfirm
:
1666 return process_gcf(pskb
, ct
, ctinfo
, data
,
1667 &ras
->gatekeeperConfirm
);
1668 case eRasMessage_registrationRequest
:
1669 return process_rrq(pskb
, ct
, ctinfo
, data
,
1670 &ras
->registrationRequest
);
1671 case eRasMessage_registrationConfirm
:
1672 return process_rcf(pskb
, ct
, ctinfo
, data
,
1673 &ras
->registrationConfirm
);
1674 case eRasMessage_unregistrationRequest
:
1675 return process_urq(pskb
, ct
, ctinfo
, data
,
1676 &ras
->unregistrationRequest
);
1677 case eRasMessage_admissionRequest
:
1678 return process_arq(pskb
, ct
, ctinfo
, data
,
1679 &ras
->admissionRequest
);
1680 case eRasMessage_admissionConfirm
:
1681 return process_acf(pskb
, ct
, ctinfo
, data
,
1682 &ras
->admissionConfirm
);
1683 case eRasMessage_locationRequest
:
1684 return process_lrq(pskb
, ct
, ctinfo
, data
,
1685 &ras
->locationRequest
);
1686 case eRasMessage_locationConfirm
:
1687 return process_lcf(pskb
, ct
, ctinfo
, data
,
1688 &ras
->locationConfirm
);
1689 case eRasMessage_infoRequestResponse
:
1690 return process_irr(pskb
, ct
, ctinfo
, data
,
1691 &ras
->infoRequestResponse
);
1693 DEBUGP("nf_ct_ras: RAS message %d\n", ras
->choice
);
1700 /****************************************************************************/
1701 static int ras_help(struct sk_buff
**pskb
, unsigned int protoff
,
1702 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
1704 static RasMessage ras
;
1705 unsigned char *data
;
1709 DEBUGP("nf_ct_ras: skblen = %u\n", (*pskb
)->len
);
1711 spin_lock_bh(&nf_h323_lock
);
1714 data
= get_udp_data(pskb
, protoff
, &datalen
);
1717 DEBUGP("nf_ct_ras: RAS message len=%d ", datalen
);
1718 NF_CT_DUMP_TUPLE(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
1720 /* Decode RAS message */
1721 ret
= DecodeRasMessage(data
, datalen
, &ras
);
1723 if (net_ratelimit())
1724 printk("nf_ct_ras: decoding error: %s\n",
1725 ret
== H323_ERROR_BOUND
?
1726 "out of bound" : "out of range");
1730 /* Process RAS message */
1731 if (process_ras(pskb
, ct
, ctinfo
, &data
, &ras
) < 0)
1735 spin_unlock_bh(&nf_h323_lock
);
1739 spin_unlock_bh(&nf_h323_lock
);
1740 if (net_ratelimit())
1741 printk("nf_ct_ras: packet dropped\n");
1745 /****************************************************************************/
1746 static struct nf_conntrack_helper nf_conntrack_helper_ras
[] __read_mostly
= {
1752 .tuple
.src
.l3num
= AF_INET
,
1753 .tuple
.src
.u
.udp
.port
= __constant_htons(RAS_PORT
),
1754 .tuple
.dst
.protonum
= IPPROTO_UDP
,
1755 .mask
.src
.l3num
= 0xFFFF,
1756 .mask
.src
.u
.udp
.port
= __constant_htons(0xFFFF),
1757 .mask
.dst
.protonum
= 0xFF,
1765 .tuple
.src
.l3num
= AF_INET6
,
1766 .tuple
.src
.u
.udp
.port
= __constant_htons(RAS_PORT
),
1767 .tuple
.dst
.protonum
= IPPROTO_UDP
,
1768 .mask
.src
.l3num
= 0xFFFF,
1769 .mask
.src
.u
.udp
.port
= __constant_htons(0xFFFF),
1770 .mask
.dst
.protonum
= 0xFF,
1775 /****************************************************************************/
1776 static void __exit
nf_conntrack_h323_fini(void)
1778 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[1]);
1779 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[0]);
1780 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[1]);
1781 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[0]);
1783 DEBUGP("nf_ct_h323: fini\n");
1786 /****************************************************************************/
1787 static int __init
nf_conntrack_h323_init(void)
1791 h323_buffer
= kmalloc(65536, GFP_KERNEL
);
1794 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_q931
[0]);
1797 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_q931
[1]);
1800 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_ras
[0]);
1803 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_ras
[1]);
1806 DEBUGP("nf_ct_h323: init success\n");
1810 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[0]);
1812 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[1]);
1814 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[0]);
1819 /****************************************************************************/
1820 module_init(nf_conntrack_h323_init
);
1821 module_exit(nf_conntrack_h323_fini
);
1823 EXPORT_SYMBOL_GPL(get_h225_addr
);
1824 EXPORT_SYMBOL_GPL(set_h245_addr_hook
);
1825 EXPORT_SYMBOL_GPL(set_h225_addr_hook
);
1826 EXPORT_SYMBOL_GPL(set_sig_addr_hook
);
1827 EXPORT_SYMBOL_GPL(set_ras_addr_hook
);
1828 EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook
);
1829 EXPORT_SYMBOL_GPL(nat_t120_hook
);
1830 EXPORT_SYMBOL_GPL(nat_h245_hook
);
1831 EXPORT_SYMBOL_GPL(nat_callforwarding_hook
);
1832 EXPORT_SYMBOL_GPL(nat_q931_hook
);
1834 MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1835 MODULE_DESCRIPTION("H.323 connection tracking helper");
1836 MODULE_LICENSE("GPL");
1837 MODULE_ALIAS("ip_conntrack_h323");