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/slab.h>
21 #include <linux/udp.h>
22 #include <linux/tcp.h>
23 #include <linux/skbuff.h>
24 #include <net/route.h>
25 #include <net/ip6_route.h>
27 #include <net/netfilter/nf_conntrack.h>
28 #include <net/netfilter/nf_conntrack_core.h>
29 #include <net/netfilter/nf_conntrack_tuple.h>
30 #include <net/netfilter/nf_conntrack_expect.h>
31 #include <net/netfilter/nf_conntrack_ecache.h>
32 #include <net/netfilter/nf_conntrack_helper.h>
33 #include <net/netfilter/nf_conntrack_zones.h>
34 #include <linux/netfilter/nf_conntrack_h323.h>
37 static unsigned int default_rrq_ttl __read_mostly
= 300;
38 module_param(default_rrq_ttl
, uint
, 0600);
39 MODULE_PARM_DESC(default_rrq_ttl
, "use this TTL if it's missing in RRQ");
41 static int gkrouted_only __read_mostly
= 1;
42 module_param(gkrouted_only
, int, 0600);
43 MODULE_PARM_DESC(gkrouted_only
, "only accept calls from gatekeeper");
45 static int callforward_filter __read_mostly
= 1;
46 module_param(callforward_filter
, bool, 0600);
47 MODULE_PARM_DESC(callforward_filter
, "only create call forwarding expectations "
48 "if both endpoints are on different sides "
49 "(determined by routing information)");
52 int (*set_h245_addr_hook
) (struct sk_buff
*skb
,
53 unsigned char **data
, int dataoff
,
54 H245_TransportAddress
*taddr
,
55 union nf_inet_addr
*addr
, __be16 port
)
57 int (*set_h225_addr_hook
) (struct sk_buff
*skb
,
58 unsigned char **data
, int dataoff
,
59 TransportAddress
*taddr
,
60 union nf_inet_addr
*addr
, __be16 port
)
62 int (*set_sig_addr_hook
) (struct sk_buff
*skb
,
64 enum ip_conntrack_info ctinfo
,
66 TransportAddress
*taddr
, int count
) __read_mostly
;
67 int (*set_ras_addr_hook
) (struct sk_buff
*skb
,
69 enum ip_conntrack_info ctinfo
,
71 TransportAddress
*taddr
, int count
) __read_mostly
;
72 int (*nat_rtp_rtcp_hook
) (struct sk_buff
*skb
,
74 enum ip_conntrack_info ctinfo
,
75 unsigned char **data
, int dataoff
,
76 H245_TransportAddress
*taddr
,
77 __be16 port
, __be16 rtp_port
,
78 struct nf_conntrack_expect
*rtp_exp
,
79 struct nf_conntrack_expect
*rtcp_exp
) __read_mostly
;
80 int (*nat_t120_hook
) (struct sk_buff
*skb
,
82 enum ip_conntrack_info ctinfo
,
83 unsigned char **data
, int dataoff
,
84 H245_TransportAddress
*taddr
, __be16 port
,
85 struct nf_conntrack_expect
*exp
) __read_mostly
;
86 int (*nat_h245_hook
) (struct sk_buff
*skb
,
88 enum ip_conntrack_info ctinfo
,
89 unsigned char **data
, int dataoff
,
90 TransportAddress
*taddr
, __be16 port
,
91 struct nf_conntrack_expect
*exp
) __read_mostly
;
92 int (*nat_callforwarding_hook
) (struct sk_buff
*skb
,
94 enum ip_conntrack_info ctinfo
,
95 unsigned char **data
, int dataoff
,
96 TransportAddress
*taddr
, __be16 port
,
97 struct nf_conntrack_expect
*exp
) __read_mostly
;
98 int (*nat_q931_hook
) (struct sk_buff
*skb
,
100 enum ip_conntrack_info ctinfo
,
101 unsigned char **data
, TransportAddress
*taddr
, int idx
,
102 __be16 port
, struct nf_conntrack_expect
*exp
)
105 static DEFINE_SPINLOCK(nf_h323_lock
);
106 static char *h323_buffer
;
108 static struct nf_conntrack_helper nf_conntrack_helper_h245
;
109 static struct nf_conntrack_helper nf_conntrack_helper_q931
[];
110 static struct nf_conntrack_helper nf_conntrack_helper_ras
[];
112 /****************************************************************************/
113 static int get_tpkt_data(struct sk_buff
*skb
, unsigned int protoff
,
114 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
,
115 unsigned char **data
, int *datalen
, int *dataoff
)
117 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
118 int dir
= CTINFO2DIR(ctinfo
);
119 const struct tcphdr
*th
;
128 th
= skb_header_pointer(skb
, protoff
, sizeof(_tcph
), &_tcph
);
132 /* Get TCP data offset */
133 tcpdataoff
= protoff
+ th
->doff
* 4;
135 /* Get TCP data length */
136 tcpdatalen
= skb
->len
- tcpdataoff
;
137 if (tcpdatalen
<= 0) /* No TCP data */
140 if (*data
== NULL
) { /* first TPKT */
141 /* Get first TPKT pointer */
142 tpkt
= skb_header_pointer(skb
, tcpdataoff
, tcpdatalen
,
144 BUG_ON(tpkt
== NULL
);
146 /* Validate TPKT identifier */
147 if (tcpdatalen
< 4 || tpkt
[0] != 0x03 || tpkt
[1] != 0) {
148 /* Netmeeting sends TPKT header and data separately */
149 if (info
->tpkt_len
[dir
] > 0) {
150 pr_debug("nf_ct_h323: previous packet "
151 "indicated separate TPKT data of %hu "
152 "bytes\n", info
->tpkt_len
[dir
]);
153 if (info
->tpkt_len
[dir
] <= tcpdatalen
) {
154 /* Yes, there was a TPKT header
157 *datalen
= info
->tpkt_len
[dir
];
162 /* Fragmented TPKT */
163 pr_debug("nf_ct_h323: fragmented TPKT\n");
167 /* It is not even a TPKT */
171 } else { /* Next TPKT */
172 tpktoff
= *dataoff
+ *datalen
;
173 tcpdatalen
-= tpktoff
;
174 if (tcpdatalen
<= 4) /* No more TPKT */
176 tpkt
= *data
+ *datalen
;
178 /* Validate TPKT identifier */
179 if (tpkt
[0] != 0x03 || tpkt
[1] != 0)
183 /* Validate TPKT length */
184 tpktlen
= tpkt
[2] * 256 + tpkt
[3];
187 if (tpktlen
> tcpdatalen
) {
188 if (tcpdatalen
== 4) { /* Separate TPKT header */
189 /* Netmeeting sends TPKT header and data separately */
190 pr_debug("nf_ct_h323: separate TPKT header indicates "
191 "there will be TPKT data of %hu bytes\n",
193 info
->tpkt_len
[dir
] = tpktlen
- 4;
197 pr_debug("nf_ct_h323: incomplete TPKT (fragmented?)\n");
201 /* This is the encapsulated data */
203 *datalen
= tpktlen
- 4;
204 *dataoff
= tpktoff
+ 4;
207 /* Clear TPKT length */
208 info
->tpkt_len
[dir
] = 0;
212 info
->tpkt_len
[dir
] = 0;
216 /****************************************************************************/
217 static int get_h245_addr(struct nf_conn
*ct
, const unsigned char *data
,
218 H245_TransportAddress
*taddr
,
219 union nf_inet_addr
*addr
, __be16
*port
)
221 const unsigned char *p
;
224 if (taddr
->choice
!= eH245_TransportAddress_unicastAddress
)
227 switch (taddr
->unicastAddress
.choice
) {
228 case eUnicastAddress_iPAddress
:
229 if (nf_ct_l3num(ct
) != AF_INET
)
231 p
= data
+ taddr
->unicastAddress
.iPAddress
.network
;
234 case eUnicastAddress_iP6Address
:
235 if (nf_ct_l3num(ct
) != AF_INET6
)
237 p
= data
+ taddr
->unicastAddress
.iP6Address
.network
;
244 memcpy(addr
, p
, len
);
245 memset((void *)addr
+ len
, 0, sizeof(*addr
) - len
);
246 memcpy(port
, p
+ len
, sizeof(__be16
));
251 /****************************************************************************/
252 static int expect_rtp_rtcp(struct sk_buff
*skb
, struct nf_conn
*ct
,
253 enum ip_conntrack_info ctinfo
,
254 unsigned char **data
, int dataoff
,
255 H245_TransportAddress
*taddr
)
257 int dir
= CTINFO2DIR(ctinfo
);
260 __be16 rtp_port
, rtcp_port
;
261 union nf_inet_addr addr
;
262 struct nf_conntrack_expect
*rtp_exp
;
263 struct nf_conntrack_expect
*rtcp_exp
;
264 typeof(nat_rtp_rtcp_hook
) nat_rtp_rtcp
;
266 /* Read RTP or RTCP address */
267 if (!get_h245_addr(ct
, *data
, taddr
, &addr
, &port
) ||
268 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) ||
272 /* RTP port is even */
275 rtcp_port
= htons(ntohs(port
) + 1);
277 /* Create expect for RTP */
278 if ((rtp_exp
= nf_ct_expect_alloc(ct
)) == NULL
)
280 nf_ct_expect_init(rtp_exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
281 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
282 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
283 IPPROTO_UDP
, NULL
, &rtp_port
);
285 /* Create expect for RTCP */
286 if ((rtcp_exp
= nf_ct_expect_alloc(ct
)) == NULL
) {
287 nf_ct_expect_put(rtp_exp
);
290 nf_ct_expect_init(rtcp_exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
291 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
292 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
293 IPPROTO_UDP
, NULL
, &rtcp_port
);
295 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
296 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
297 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
298 (nat_rtp_rtcp
= rcu_dereference(nat_rtp_rtcp_hook
)) &&
299 ct
->status
& IPS_NAT_MASK
) {
301 ret
= nat_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
302 taddr
, port
, rtp_port
, rtp_exp
, rtcp_exp
);
303 } else { /* Conntrack only */
304 if (nf_ct_expect_related(rtp_exp
) == 0) {
305 if (nf_ct_expect_related(rtcp_exp
) == 0) {
306 pr_debug("nf_ct_h323: expect RTP ");
307 nf_ct_dump_tuple(&rtp_exp
->tuple
);
308 pr_debug("nf_ct_h323: expect RTCP ");
309 nf_ct_dump_tuple(&rtcp_exp
->tuple
);
311 nf_ct_unexpect_related(rtp_exp
);
318 nf_ct_expect_put(rtp_exp
);
319 nf_ct_expect_put(rtcp_exp
);
324 /****************************************************************************/
325 static int expect_t120(struct sk_buff
*skb
,
327 enum ip_conntrack_info ctinfo
,
328 unsigned char **data
, int dataoff
,
329 H245_TransportAddress
*taddr
)
331 int dir
= CTINFO2DIR(ctinfo
);
334 union nf_inet_addr addr
;
335 struct nf_conntrack_expect
*exp
;
336 typeof(nat_t120_hook
) nat_t120
;
338 /* Read T.120 address */
339 if (!get_h245_addr(ct
, *data
, taddr
, &addr
, &port
) ||
340 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) ||
344 /* Create expect for T.120 connections */
345 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
347 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
348 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
349 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
350 IPPROTO_TCP
, NULL
, &port
);
351 exp
->flags
= NF_CT_EXPECT_PERMANENT
; /* Accept multiple channels */
353 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
354 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
355 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
356 (nat_t120
= rcu_dereference(nat_t120_hook
)) &&
357 ct
->status
& IPS_NAT_MASK
) {
359 ret
= nat_t120(skb
, ct
, ctinfo
, data
, dataoff
, taddr
,
361 } else { /* Conntrack only */
362 if (nf_ct_expect_related(exp
) == 0) {
363 pr_debug("nf_ct_h323: expect T.120 ");
364 nf_ct_dump_tuple(&exp
->tuple
);
369 nf_ct_expect_put(exp
);
374 /****************************************************************************/
375 static int process_h245_channel(struct sk_buff
*skb
,
377 enum ip_conntrack_info ctinfo
,
378 unsigned char **data
, int dataoff
,
379 H2250LogicalChannelParameters
*channel
)
383 if (channel
->options
& eH2250LogicalChannelParameters_mediaChannel
) {
385 ret
= expect_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
386 &channel
->mediaChannel
);
392 options
& eH2250LogicalChannelParameters_mediaControlChannel
) {
394 ret
= expect_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
395 &channel
->mediaControlChannel
);
403 /****************************************************************************/
404 static int process_olc(struct sk_buff
*skb
, struct nf_conn
*ct
,
405 enum ip_conntrack_info ctinfo
,
406 unsigned char **data
, int dataoff
,
407 OpenLogicalChannel
*olc
)
411 pr_debug("nf_ct_h323: OpenLogicalChannel\n");
413 if (olc
->forwardLogicalChannelParameters
.multiplexParameters
.choice
==
414 eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters
)
416 ret
= process_h245_channel(skb
, ct
, ctinfo
, data
, dataoff
,
418 forwardLogicalChannelParameters
.
420 h2250LogicalChannelParameters
);
426 eOpenLogicalChannel_reverseLogicalChannelParameters
) &&
427 (olc
->reverseLogicalChannelParameters
.options
&
428 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters
)
429 && (olc
->reverseLogicalChannelParameters
.multiplexParameters
.
431 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters
))
434 process_h245_channel(skb
, ct
, ctinfo
, data
, dataoff
,
436 reverseLogicalChannelParameters
.
438 h2250LogicalChannelParameters
);
443 if ((olc
->options
& eOpenLogicalChannel_separateStack
) &&
444 olc
->forwardLogicalChannelParameters
.dataType
.choice
==
446 olc
->forwardLogicalChannelParameters
.dataType
.data
.application
.
447 choice
== eDataApplicationCapability_application_t120
&&
448 olc
->forwardLogicalChannelParameters
.dataType
.data
.application
.
449 t120
.choice
== eDataProtocolCapability_separateLANStack
&&
450 olc
->separateStack
.networkAddress
.choice
==
451 eNetworkAccessParameters_networkAddress_localAreaAddress
) {
452 ret
= expect_t120(skb
, ct
, ctinfo
, data
, dataoff
,
453 &olc
->separateStack
.networkAddress
.
462 /****************************************************************************/
463 static int process_olca(struct sk_buff
*skb
, struct nf_conn
*ct
,
464 enum ip_conntrack_info ctinfo
,
465 unsigned char **data
, int dataoff
,
466 OpenLogicalChannelAck
*olca
)
468 H2250LogicalChannelAckParameters
*ack
;
471 pr_debug("nf_ct_h323: OpenLogicalChannelAck\n");
474 eOpenLogicalChannelAck_reverseLogicalChannelParameters
) &&
475 (olca
->reverseLogicalChannelParameters
.options
&
476 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters
)
477 && (olca
->reverseLogicalChannelParameters
.multiplexParameters
.
479 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters
))
481 ret
= process_h245_channel(skb
, ct
, ctinfo
, data
, dataoff
,
483 reverseLogicalChannelParameters
.
485 h2250LogicalChannelParameters
);
491 eOpenLogicalChannelAck_forwardMultiplexAckParameters
) &&
492 (olca
->forwardMultiplexAckParameters
.choice
==
493 eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters
))
495 ack
= &olca
->forwardMultiplexAckParameters
.
496 h2250LogicalChannelAckParameters
;
498 eH2250LogicalChannelAckParameters_mediaChannel
) {
500 ret
= expect_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
507 eH2250LogicalChannelAckParameters_mediaControlChannel
) {
509 ret
= expect_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
510 &ack
->mediaControlChannel
);
516 if ((olca
->options
& eOpenLogicalChannelAck_separateStack
) &&
517 olca
->separateStack
.networkAddress
.choice
==
518 eNetworkAccessParameters_networkAddress_localAreaAddress
) {
519 ret
= expect_t120(skb
, ct
, ctinfo
, data
, dataoff
,
520 &olca
->separateStack
.networkAddress
.
529 /****************************************************************************/
530 static int process_h245(struct sk_buff
*skb
, struct nf_conn
*ct
,
531 enum ip_conntrack_info ctinfo
,
532 unsigned char **data
, int dataoff
,
533 MultimediaSystemControlMessage
*mscm
)
535 switch (mscm
->choice
) {
536 case eMultimediaSystemControlMessage_request
:
537 if (mscm
->request
.choice
==
538 eRequestMessage_openLogicalChannel
) {
539 return process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
540 &mscm
->request
.openLogicalChannel
);
542 pr_debug("nf_ct_h323: H.245 Request %d\n",
543 mscm
->request
.choice
);
545 case eMultimediaSystemControlMessage_response
:
546 if (mscm
->response
.choice
==
547 eResponseMessage_openLogicalChannelAck
) {
548 return process_olca(skb
, ct
, ctinfo
, data
, dataoff
,
550 openLogicalChannelAck
);
552 pr_debug("nf_ct_h323: H.245 Response %d\n",
553 mscm
->response
.choice
);
556 pr_debug("nf_ct_h323: H.245 signal %d\n", mscm
->choice
);
563 /****************************************************************************/
564 static int h245_help(struct sk_buff
*skb
, unsigned int protoff
,
565 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
567 static MultimediaSystemControlMessage mscm
;
568 unsigned char *data
= NULL
;
573 /* Until there's been traffic both ways, don't look in packets. */
574 if (ctinfo
!= IP_CT_ESTABLISHED
&&
575 ctinfo
!= IP_CT_ESTABLISHED
+ IP_CT_IS_REPLY
) {
578 pr_debug("nf_ct_h245: skblen = %u\n", skb
->len
);
580 spin_lock_bh(&nf_h323_lock
);
582 /* Process each TPKT */
583 while (get_tpkt_data(skb
, protoff
, ct
, ctinfo
,
584 &data
, &datalen
, &dataoff
)) {
585 pr_debug("nf_ct_h245: TPKT len=%d ", datalen
);
586 nf_ct_dump_tuple(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
588 /* Decode H.245 signal */
589 ret
= DecodeMultimediaSystemControlMessage(data
, datalen
,
592 pr_debug("nf_ct_h245: decoding error: %s\n",
593 ret
== H323_ERROR_BOUND
?
594 "out of bound" : "out of range");
595 /* We don't drop when decoding error */
599 /* Process H.245 signal */
600 if (process_h245(skb
, ct
, ctinfo
, &data
, dataoff
, &mscm
) < 0)
604 spin_unlock_bh(&nf_h323_lock
);
608 spin_unlock_bh(&nf_h323_lock
);
610 pr_info("nf_ct_h245: packet dropped\n");
614 /****************************************************************************/
615 static const struct nf_conntrack_expect_policy h245_exp_policy
= {
616 .max_expected
= H323_RTP_CHANNEL_MAX
* 4 + 2 /* T.120 */,
620 static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly
= {
623 .tuple
.src
.l3num
= AF_UNSPEC
,
624 .tuple
.dst
.protonum
= IPPROTO_UDP
,
626 .expect_policy
= &h245_exp_policy
,
629 /****************************************************************************/
630 int get_h225_addr(struct nf_conn
*ct
, unsigned char *data
,
631 TransportAddress
*taddr
,
632 union nf_inet_addr
*addr
, __be16
*port
)
634 const unsigned char *p
;
637 switch (taddr
->choice
) {
638 case eTransportAddress_ipAddress
:
639 if (nf_ct_l3num(ct
) != AF_INET
)
641 p
= data
+ taddr
->ipAddress
.ip
;
644 case eTransportAddress_ip6Address
:
645 if (nf_ct_l3num(ct
) != AF_INET6
)
647 p
= data
+ taddr
->ip6Address
.ip
;
654 memcpy(addr
, p
, len
);
655 memset((void *)addr
+ len
, 0, sizeof(*addr
) - len
);
656 memcpy(port
, p
+ len
, sizeof(__be16
));
661 /****************************************************************************/
662 static int expect_h245(struct sk_buff
*skb
, struct nf_conn
*ct
,
663 enum ip_conntrack_info ctinfo
,
664 unsigned char **data
, int dataoff
,
665 TransportAddress
*taddr
)
667 int dir
= CTINFO2DIR(ctinfo
);
670 union nf_inet_addr addr
;
671 struct nf_conntrack_expect
*exp
;
672 typeof(nat_h245_hook
) nat_h245
;
674 /* Read h245Address */
675 if (!get_h225_addr(ct
, *data
, taddr
, &addr
, &port
) ||
676 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) ||
680 /* Create expect for h245 connection */
681 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
683 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
684 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
685 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
686 IPPROTO_TCP
, NULL
, &port
);
687 exp
->helper
= &nf_conntrack_helper_h245
;
689 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
690 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
691 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
692 (nat_h245
= rcu_dereference(nat_h245_hook
)) &&
693 ct
->status
& IPS_NAT_MASK
) {
695 ret
= nat_h245(skb
, ct
, ctinfo
, data
, dataoff
, taddr
,
697 } else { /* Conntrack only */
698 if (nf_ct_expect_related(exp
) == 0) {
699 pr_debug("nf_ct_q931: expect H.245 ");
700 nf_ct_dump_tuple(&exp
->tuple
);
705 nf_ct_expect_put(exp
);
710 /* If the calling party is on the same side of the forward-to party,
711 * we don't need to track the second call */
712 static int callforward_do_filter(const union nf_inet_addr
*src
,
713 const union nf_inet_addr
*dst
,
716 const struct nf_afinfo
*afinfo
;
717 struct flowi fl1
, fl2
;
720 /* rcu_read_lock()ed by nf_hook_slow() */
721 afinfo
= nf_get_afinfo(family
);
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 (!afinfo
->route((struct dst_entry
**)&rt1
, &fl1
)) {
735 if (!afinfo
->route((struct dst_entry
**)&rt2
, &fl2
)) {
736 if (rt1
->rt_gateway
== rt2
->rt_gateway
&&
737 rt1
->dst
.dev
== rt2
->dst
.dev
)
739 dst_release(&rt2
->dst
);
741 dst_release(&rt1
->dst
);
745 #if defined(CONFIG_NF_CONNTRACK_IPV6) || \
746 defined(CONFIG_NF_CONNTRACK_IPV6_MODULE)
748 struct rt6_info
*rt1
, *rt2
;
750 memcpy(&fl1
.fl6_dst
, src
, sizeof(fl1
.fl6_dst
));
751 memcpy(&fl2
.fl6_dst
, dst
, sizeof(fl2
.fl6_dst
));
752 if (!afinfo
->route((struct dst_entry
**)&rt1
, &fl1
)) {
753 if (!afinfo
->route((struct dst_entry
**)&rt2
, &fl2
)) {
754 if (!memcmp(&rt1
->rt6i_gateway
, &rt2
->rt6i_gateway
,
755 sizeof(rt1
->rt6i_gateway
)) &&
756 rt1
->dst
.dev
== rt2
->dst
.dev
)
758 dst_release(&rt2
->dst
);
760 dst_release(&rt1
->dst
);
770 /****************************************************************************/
771 static int expect_callforwarding(struct sk_buff
*skb
,
773 enum ip_conntrack_info ctinfo
,
774 unsigned char **data
, int dataoff
,
775 TransportAddress
*taddr
)
777 int dir
= CTINFO2DIR(ctinfo
);
780 union nf_inet_addr addr
;
781 struct nf_conntrack_expect
*exp
;
782 typeof(nat_callforwarding_hook
) nat_callforwarding
;
784 /* Read alternativeAddress */
785 if (!get_h225_addr(ct
, *data
, taddr
, &addr
, &port
) || port
== 0)
788 /* If the calling party is on the same side of the forward-to party,
789 * we don't need to track the second call */
790 if (callforward_filter
&&
791 callforward_do_filter(&addr
, &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
793 pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
797 /* Create expect for the second call leg */
798 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
800 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
801 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
802 IPPROTO_TCP
, NULL
, &port
);
803 exp
->helper
= nf_conntrack_helper_q931
;
805 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
806 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
807 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
808 (nat_callforwarding
= rcu_dereference(nat_callforwarding_hook
)) &&
809 ct
->status
& IPS_NAT_MASK
) {
811 ret
= nat_callforwarding(skb
, ct
, ctinfo
, data
, dataoff
,
813 } else { /* Conntrack only */
814 if (nf_ct_expect_related(exp
) == 0) {
815 pr_debug("nf_ct_q931: expect Call Forwarding ");
816 nf_ct_dump_tuple(&exp
->tuple
);
821 nf_ct_expect_put(exp
);
826 /****************************************************************************/
827 static int process_setup(struct sk_buff
*skb
, struct nf_conn
*ct
,
828 enum ip_conntrack_info ctinfo
,
829 unsigned char **data
, int dataoff
,
832 int dir
= CTINFO2DIR(ctinfo
);
836 union nf_inet_addr addr
;
837 typeof(set_h225_addr_hook
) set_h225_addr
;
839 pr_debug("nf_ct_q931: Setup\n");
841 if (setup
->options
& eSetup_UUIE_h245Address
) {
842 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
843 &setup
->h245Address
);
848 set_h225_addr
= rcu_dereference(set_h225_addr_hook
);
849 if ((setup
->options
& eSetup_UUIE_destCallSignalAddress
) &&
850 (set_h225_addr
) && ct
->status
& IPS_NAT_MASK
&&
851 get_h225_addr(ct
, *data
, &setup
->destCallSignalAddress
,
853 memcmp(&addr
, &ct
->tuplehash
[!dir
].tuple
.src
.u3
, sizeof(addr
))) {
854 pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n",
855 &addr
, ntohs(port
), &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
856 ntohs(ct
->tuplehash
[!dir
].tuple
.src
.u
.tcp
.port
));
857 ret
= set_h225_addr(skb
, data
, dataoff
,
858 &setup
->destCallSignalAddress
,
859 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
860 ct
->tuplehash
[!dir
].tuple
.src
.u
.tcp
.port
);
865 if ((setup
->options
& eSetup_UUIE_sourceCallSignalAddress
) &&
866 (set_h225_addr
) && ct
->status
& IPS_NAT_MASK
&&
867 get_h225_addr(ct
, *data
, &setup
->sourceCallSignalAddress
,
869 memcmp(&addr
, &ct
->tuplehash
[!dir
].tuple
.dst
.u3
, sizeof(addr
))) {
870 pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n",
871 &addr
, ntohs(port
), &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
872 ntohs(ct
->tuplehash
[!dir
].tuple
.dst
.u
.tcp
.port
));
873 ret
= set_h225_addr(skb
, data
, dataoff
,
874 &setup
->sourceCallSignalAddress
,
875 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
876 ct
->tuplehash
[!dir
].tuple
.dst
.u
.tcp
.port
);
881 if (setup
->options
& eSetup_UUIE_fastStart
) {
882 for (i
= 0; i
< setup
->fastStart
.count
; i
++) {
883 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
884 &setup
->fastStart
.item
[i
]);
893 /****************************************************************************/
894 static int process_callproceeding(struct sk_buff
*skb
,
896 enum ip_conntrack_info ctinfo
,
897 unsigned char **data
, int dataoff
,
898 CallProceeding_UUIE
*callproc
)
903 pr_debug("nf_ct_q931: CallProceeding\n");
905 if (callproc
->options
& eCallProceeding_UUIE_h245Address
) {
906 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
907 &callproc
->h245Address
);
912 if (callproc
->options
& eCallProceeding_UUIE_fastStart
) {
913 for (i
= 0; i
< callproc
->fastStart
.count
; i
++) {
914 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
915 &callproc
->fastStart
.item
[i
]);
924 /****************************************************************************/
925 static int process_connect(struct sk_buff
*skb
, struct nf_conn
*ct
,
926 enum ip_conntrack_info ctinfo
,
927 unsigned char **data
, int dataoff
,
928 Connect_UUIE
*connect
)
933 pr_debug("nf_ct_q931: Connect\n");
935 if (connect
->options
& eConnect_UUIE_h245Address
) {
936 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
937 &connect
->h245Address
);
942 if (connect
->options
& eConnect_UUIE_fastStart
) {
943 for (i
= 0; i
< connect
->fastStart
.count
; i
++) {
944 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
945 &connect
->fastStart
.item
[i
]);
954 /****************************************************************************/
955 static int process_alerting(struct sk_buff
*skb
, struct nf_conn
*ct
,
956 enum ip_conntrack_info ctinfo
,
957 unsigned char **data
, int dataoff
,
958 Alerting_UUIE
*alert
)
963 pr_debug("nf_ct_q931: Alerting\n");
965 if (alert
->options
& eAlerting_UUIE_h245Address
) {
966 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
967 &alert
->h245Address
);
972 if (alert
->options
& eAlerting_UUIE_fastStart
) {
973 for (i
= 0; i
< alert
->fastStart
.count
; i
++) {
974 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
975 &alert
->fastStart
.item
[i
]);
984 /****************************************************************************/
985 static int process_facility(struct sk_buff
*skb
, struct nf_conn
*ct
,
986 enum ip_conntrack_info ctinfo
,
987 unsigned char **data
, int dataoff
,
988 Facility_UUIE
*facility
)
993 pr_debug("nf_ct_q931: Facility\n");
995 if (facility
->reason
.choice
== eFacilityReason_callForwarded
) {
996 if (facility
->options
& eFacility_UUIE_alternativeAddress
)
997 return expect_callforwarding(skb
, ct
, ctinfo
, data
,
1000 alternativeAddress
);
1004 if (facility
->options
& eFacility_UUIE_h245Address
) {
1005 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
1006 &facility
->h245Address
);
1011 if (facility
->options
& eFacility_UUIE_fastStart
) {
1012 for (i
= 0; i
< facility
->fastStart
.count
; i
++) {
1013 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
1014 &facility
->fastStart
.item
[i
]);
1023 /****************************************************************************/
1024 static int process_progress(struct sk_buff
*skb
, struct nf_conn
*ct
,
1025 enum ip_conntrack_info ctinfo
,
1026 unsigned char **data
, int dataoff
,
1027 Progress_UUIE
*progress
)
1032 pr_debug("nf_ct_q931: Progress\n");
1034 if (progress
->options
& eProgress_UUIE_h245Address
) {
1035 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
1036 &progress
->h245Address
);
1041 if (progress
->options
& eProgress_UUIE_fastStart
) {
1042 for (i
= 0; i
< progress
->fastStart
.count
; i
++) {
1043 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
1044 &progress
->fastStart
.item
[i
]);
1053 /****************************************************************************/
1054 static int process_q931(struct sk_buff
*skb
, struct nf_conn
*ct
,
1055 enum ip_conntrack_info ctinfo
,
1056 unsigned char **data
, int dataoff
, Q931
*q931
)
1058 H323_UU_PDU
*pdu
= &q931
->UUIE
.h323_uu_pdu
;
1062 switch (pdu
->h323_message_body
.choice
) {
1063 case eH323_UU_PDU_h323_message_body_setup
:
1064 ret
= process_setup(skb
, ct
, ctinfo
, data
, dataoff
,
1065 &pdu
->h323_message_body
.setup
);
1067 case eH323_UU_PDU_h323_message_body_callProceeding
:
1068 ret
= process_callproceeding(skb
, ct
, ctinfo
, data
, dataoff
,
1069 &pdu
->h323_message_body
.
1072 case eH323_UU_PDU_h323_message_body_connect
:
1073 ret
= process_connect(skb
, ct
, ctinfo
, data
, dataoff
,
1074 &pdu
->h323_message_body
.connect
);
1076 case eH323_UU_PDU_h323_message_body_alerting
:
1077 ret
= process_alerting(skb
, ct
, ctinfo
, data
, dataoff
,
1078 &pdu
->h323_message_body
.alerting
);
1080 case eH323_UU_PDU_h323_message_body_facility
:
1081 ret
= process_facility(skb
, ct
, ctinfo
, data
, dataoff
,
1082 &pdu
->h323_message_body
.facility
);
1084 case eH323_UU_PDU_h323_message_body_progress
:
1085 ret
= process_progress(skb
, ct
, ctinfo
, data
, dataoff
,
1086 &pdu
->h323_message_body
.progress
);
1089 pr_debug("nf_ct_q931: Q.931 signal %d\n",
1090 pdu
->h323_message_body
.choice
);
1097 if (pdu
->options
& eH323_UU_PDU_h245Control
) {
1098 for (i
= 0; i
< pdu
->h245Control
.count
; i
++) {
1099 ret
= process_h245(skb
, ct
, ctinfo
, data
, dataoff
,
1100 &pdu
->h245Control
.item
[i
]);
1109 /****************************************************************************/
1110 static int q931_help(struct sk_buff
*skb
, unsigned int protoff
,
1111 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
1114 unsigned char *data
= NULL
;
1119 /* Until there's been traffic both ways, don't look in packets. */
1120 if (ctinfo
!= IP_CT_ESTABLISHED
&&
1121 ctinfo
!= IP_CT_ESTABLISHED
+ IP_CT_IS_REPLY
) {
1124 pr_debug("nf_ct_q931: skblen = %u\n", skb
->len
);
1126 spin_lock_bh(&nf_h323_lock
);
1128 /* Process each TPKT */
1129 while (get_tpkt_data(skb
, protoff
, ct
, ctinfo
,
1130 &data
, &datalen
, &dataoff
)) {
1131 pr_debug("nf_ct_q931: TPKT len=%d ", datalen
);
1132 nf_ct_dump_tuple(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
1134 /* Decode Q.931 signal */
1135 ret
= DecodeQ931(data
, datalen
, &q931
);
1137 pr_debug("nf_ct_q931: decoding error: %s\n",
1138 ret
== H323_ERROR_BOUND
?
1139 "out of bound" : "out of range");
1140 /* We don't drop when decoding error */
1144 /* Process Q.931 signal */
1145 if (process_q931(skb
, ct
, ctinfo
, &data
, dataoff
, &q931
) < 0)
1149 spin_unlock_bh(&nf_h323_lock
);
1153 spin_unlock_bh(&nf_h323_lock
);
1154 if (net_ratelimit())
1155 pr_info("nf_ct_q931: packet dropped\n");
1159 /****************************************************************************/
1160 static const struct nf_conntrack_expect_policy q931_exp_policy
= {
1161 /* T.120 and H.245 */
1162 .max_expected
= H323_RTP_CHANNEL_MAX
* 4 + 4,
1166 static struct nf_conntrack_helper nf_conntrack_helper_q931
[] __read_mostly
= {
1170 .tuple
.src
.l3num
= AF_INET
,
1171 .tuple
.src
.u
.tcp
.port
= cpu_to_be16(Q931_PORT
),
1172 .tuple
.dst
.protonum
= IPPROTO_TCP
,
1174 .expect_policy
= &q931_exp_policy
,
1179 .tuple
.src
.l3num
= AF_INET6
,
1180 .tuple
.src
.u
.tcp
.port
= cpu_to_be16(Q931_PORT
),
1181 .tuple
.dst
.protonum
= IPPROTO_TCP
,
1183 .expect_policy
= &q931_exp_policy
,
1187 /****************************************************************************/
1188 static unsigned char *get_udp_data(struct sk_buff
*skb
, unsigned int protoff
,
1191 const struct udphdr
*uh
;
1195 uh
= skb_header_pointer(skb
, protoff
, sizeof(_uh
), &_uh
);
1198 dataoff
= protoff
+ sizeof(_uh
);
1199 if (dataoff
>= skb
->len
)
1201 *datalen
= skb
->len
- dataoff
;
1202 return skb_header_pointer(skb
, dataoff
, *datalen
, h323_buffer
);
1205 /****************************************************************************/
1206 static struct nf_conntrack_expect
*find_expect(struct nf_conn
*ct
,
1207 union nf_inet_addr
*addr
,
1210 struct net
*net
= nf_ct_net(ct
);
1211 struct nf_conntrack_expect
*exp
;
1212 struct nf_conntrack_tuple tuple
;
1214 memset(&tuple
.src
.u3
, 0, sizeof(tuple
.src
.u3
));
1215 tuple
.src
.u
.tcp
.port
= 0;
1216 memcpy(&tuple
.dst
.u3
, addr
, sizeof(tuple
.dst
.u3
));
1217 tuple
.dst
.u
.tcp
.port
= port
;
1218 tuple
.dst
.protonum
= IPPROTO_TCP
;
1220 exp
= __nf_ct_expect_find(net
, nf_ct_zone(ct
), &tuple
);
1221 if (exp
&& exp
->master
== ct
)
1226 /****************************************************************************/
1227 static int set_expect_timeout(struct nf_conntrack_expect
*exp
,
1230 if (!exp
|| !del_timer(&exp
->timeout
))
1233 exp
->timeout
.expires
= jiffies
+ timeout
* HZ
;
1234 add_timer(&exp
->timeout
);
1239 /****************************************************************************/
1240 static int expect_q931(struct sk_buff
*skb
, struct nf_conn
*ct
,
1241 enum ip_conntrack_info ctinfo
,
1242 unsigned char **data
,
1243 TransportAddress
*taddr
, int count
)
1245 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1246 int dir
= CTINFO2DIR(ctinfo
);
1250 union nf_inet_addr addr
;
1251 struct nf_conntrack_expect
*exp
;
1252 typeof(nat_q931_hook
) nat_q931
;
1254 /* Look for the first related address */
1255 for (i
= 0; i
< count
; i
++) {
1256 if (get_h225_addr(ct
, *data
, &taddr
[i
], &addr
, &port
) &&
1257 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
,
1258 sizeof(addr
)) == 0 && port
!= 0)
1262 if (i
>= count
) /* Not found */
1265 /* Create expect for Q.931 */
1266 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1268 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1269 gkrouted_only
? /* only accept calls from GK? */
1270 &ct
->tuplehash
[!dir
].tuple
.src
.u3
: NULL
,
1271 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1272 IPPROTO_TCP
, NULL
, &port
);
1273 exp
->helper
= nf_conntrack_helper_q931
;
1274 exp
->flags
= NF_CT_EXPECT_PERMANENT
; /* Accept multiple calls */
1276 nat_q931
= rcu_dereference(nat_q931_hook
);
1277 if (nat_q931
&& ct
->status
& IPS_NAT_MASK
) { /* Need NAT */
1278 ret
= nat_q931(skb
, ct
, ctinfo
, data
, taddr
, i
, port
, exp
);
1279 } else { /* Conntrack only */
1280 if (nf_ct_expect_related(exp
) == 0) {
1281 pr_debug("nf_ct_ras: expect Q.931 ");
1282 nf_ct_dump_tuple(&exp
->tuple
);
1284 /* Save port for looking up expect in processing RCF */
1285 info
->sig_port
[dir
] = port
;
1290 nf_ct_expect_put(exp
);
1295 /****************************************************************************/
1296 static int process_grq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1297 enum ip_conntrack_info ctinfo
,
1298 unsigned char **data
, GatekeeperRequest
*grq
)
1300 typeof(set_ras_addr_hook
) set_ras_addr
;
1302 pr_debug("nf_ct_ras: GRQ\n");
1304 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1305 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) /* NATed */
1306 return set_ras_addr(skb
, ct
, ctinfo
, data
,
1307 &grq
->rasAddress
, 1);
1311 /****************************************************************************/
1312 static int process_gcf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1313 enum ip_conntrack_info ctinfo
,
1314 unsigned char **data
, GatekeeperConfirm
*gcf
)
1316 int dir
= CTINFO2DIR(ctinfo
);
1319 union nf_inet_addr addr
;
1320 struct nf_conntrack_expect
*exp
;
1322 pr_debug("nf_ct_ras: GCF\n");
1324 if (!get_h225_addr(ct
, *data
, &gcf
->rasAddress
, &addr
, &port
))
1327 /* Registration port is the same as discovery port */
1328 if (!memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1329 port
== ct
->tuplehash
[dir
].tuple
.src
.u
.udp
.port
)
1332 /* Avoid RAS expectation loops. A GCF is never expected. */
1333 if (test_bit(IPS_EXPECTED_BIT
, &ct
->status
))
1336 /* Need new expect */
1337 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1339 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1340 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1341 IPPROTO_UDP
, NULL
, &port
);
1342 exp
->helper
= nf_conntrack_helper_ras
;
1344 if (nf_ct_expect_related(exp
) == 0) {
1345 pr_debug("nf_ct_ras: expect RAS ");
1346 nf_ct_dump_tuple(&exp
->tuple
);
1350 nf_ct_expect_put(exp
);
1355 /****************************************************************************/
1356 static int process_rrq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1357 enum ip_conntrack_info ctinfo
,
1358 unsigned char **data
, RegistrationRequest
*rrq
)
1360 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1362 typeof(set_ras_addr_hook
) set_ras_addr
;
1364 pr_debug("nf_ct_ras: RRQ\n");
1366 ret
= expect_q931(skb
, ct
, ctinfo
, data
,
1367 rrq
->callSignalAddress
.item
,
1368 rrq
->callSignalAddress
.count
);
1372 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1373 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) {
1374 ret
= set_ras_addr(skb
, ct
, ctinfo
, data
,
1375 rrq
->rasAddress
.item
,
1376 rrq
->rasAddress
.count
);
1381 if (rrq
->options
& eRegistrationRequest_timeToLive
) {
1382 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq
->timeToLive
);
1383 info
->timeout
= rrq
->timeToLive
;
1385 info
->timeout
= default_rrq_ttl
;
1390 /****************************************************************************/
1391 static int process_rcf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1392 enum ip_conntrack_info ctinfo
,
1393 unsigned char **data
, RegistrationConfirm
*rcf
)
1395 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1396 int dir
= CTINFO2DIR(ctinfo
);
1398 struct nf_conntrack_expect
*exp
;
1399 typeof(set_sig_addr_hook
) set_sig_addr
;
1401 pr_debug("nf_ct_ras: RCF\n");
1403 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1404 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1405 ret
= set_sig_addr(skb
, ct
, ctinfo
, data
,
1406 rcf
->callSignalAddress
.item
,
1407 rcf
->callSignalAddress
.count
);
1412 if (rcf
->options
& eRegistrationConfirm_timeToLive
) {
1413 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf
->timeToLive
);
1414 info
->timeout
= rcf
->timeToLive
;
1417 if (info
->timeout
> 0) {
1418 pr_debug("nf_ct_ras: set RAS connection timeout to "
1419 "%u seconds\n", info
->timeout
);
1420 nf_ct_refresh(ct
, skb
, info
->timeout
* HZ
);
1422 /* Set expect timeout */
1423 spin_lock_bh(&nf_conntrack_lock
);
1424 exp
= find_expect(ct
, &ct
->tuplehash
[dir
].tuple
.dst
.u3
,
1425 info
->sig_port
[!dir
]);
1427 pr_debug("nf_ct_ras: set Q.931 expect "
1428 "timeout to %u seconds for",
1430 nf_ct_dump_tuple(&exp
->tuple
);
1431 set_expect_timeout(exp
, info
->timeout
);
1433 spin_unlock_bh(&nf_conntrack_lock
);
1439 /****************************************************************************/
1440 static int process_urq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1441 enum ip_conntrack_info ctinfo
,
1442 unsigned char **data
, UnregistrationRequest
*urq
)
1444 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1445 int dir
= CTINFO2DIR(ctinfo
);
1447 typeof(set_sig_addr_hook
) set_sig_addr
;
1449 pr_debug("nf_ct_ras: URQ\n");
1451 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1452 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1453 ret
= set_sig_addr(skb
, ct
, ctinfo
, data
,
1454 urq
->callSignalAddress
.item
,
1455 urq
->callSignalAddress
.count
);
1460 /* Clear old expect */
1461 nf_ct_remove_expectations(ct
);
1462 info
->sig_port
[dir
] = 0;
1463 info
->sig_port
[!dir
] = 0;
1465 /* Give it 30 seconds for UCF or URJ */
1466 nf_ct_refresh(ct
, skb
, 30 * HZ
);
1471 /****************************************************************************/
1472 static int process_arq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1473 enum ip_conntrack_info ctinfo
,
1474 unsigned char **data
, AdmissionRequest
*arq
)
1476 const struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1477 int dir
= CTINFO2DIR(ctinfo
);
1479 union nf_inet_addr addr
;
1480 typeof(set_h225_addr_hook
) set_h225_addr
;
1482 pr_debug("nf_ct_ras: ARQ\n");
1484 set_h225_addr
= rcu_dereference(set_h225_addr_hook
);
1485 if ((arq
->options
& eAdmissionRequest_destCallSignalAddress
) &&
1486 get_h225_addr(ct
, *data
, &arq
->destCallSignalAddress
,
1488 !memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1489 port
== info
->sig_port
[dir
] &&
1490 set_h225_addr
&& ct
->status
& IPS_NAT_MASK
) {
1492 return set_h225_addr(skb
, data
, 0,
1493 &arq
->destCallSignalAddress
,
1494 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1495 info
->sig_port
[!dir
]);
1498 if ((arq
->options
& eAdmissionRequest_srcCallSignalAddress
) &&
1499 get_h225_addr(ct
, *data
, &arq
->srcCallSignalAddress
,
1501 !memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1502 set_h225_addr
&& ct
->status
& IPS_NAT_MASK
) {
1504 return set_h225_addr(skb
, data
, 0,
1505 &arq
->srcCallSignalAddress
,
1506 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1513 /****************************************************************************/
1514 static int process_acf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1515 enum ip_conntrack_info ctinfo
,
1516 unsigned char **data
, AdmissionConfirm
*acf
)
1518 int dir
= CTINFO2DIR(ctinfo
);
1521 union nf_inet_addr addr
;
1522 struct nf_conntrack_expect
*exp
;
1523 typeof(set_sig_addr_hook
) set_sig_addr
;
1525 pr_debug("nf_ct_ras: ACF\n");
1527 if (!get_h225_addr(ct
, *data
, &acf
->destCallSignalAddress
,
1531 if (!memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.dst
.u3
, sizeof(addr
))) {
1533 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1534 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
)
1535 return set_sig_addr(skb
, ct
, ctinfo
, data
,
1536 &acf
->destCallSignalAddress
, 1);
1540 /* Need new expect */
1541 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1543 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1544 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1545 IPPROTO_TCP
, NULL
, &port
);
1546 exp
->flags
= NF_CT_EXPECT_PERMANENT
;
1547 exp
->helper
= nf_conntrack_helper_q931
;
1549 if (nf_ct_expect_related(exp
) == 0) {
1550 pr_debug("nf_ct_ras: expect Q.931 ");
1551 nf_ct_dump_tuple(&exp
->tuple
);
1555 nf_ct_expect_put(exp
);
1560 /****************************************************************************/
1561 static int process_lrq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1562 enum ip_conntrack_info ctinfo
,
1563 unsigned char **data
, LocationRequest
*lrq
)
1565 typeof(set_ras_addr_hook
) set_ras_addr
;
1567 pr_debug("nf_ct_ras: LRQ\n");
1569 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1570 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
)
1571 return set_ras_addr(skb
, ct
, ctinfo
, data
,
1572 &lrq
->replyAddress
, 1);
1576 /****************************************************************************/
1577 static int process_lcf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1578 enum ip_conntrack_info ctinfo
,
1579 unsigned char **data
, LocationConfirm
*lcf
)
1581 int dir
= CTINFO2DIR(ctinfo
);
1584 union nf_inet_addr addr
;
1585 struct nf_conntrack_expect
*exp
;
1587 pr_debug("nf_ct_ras: LCF\n");
1589 if (!get_h225_addr(ct
, *data
, &lcf
->callSignalAddress
,
1593 /* Need new expect for call signal */
1594 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1596 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1597 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1598 IPPROTO_TCP
, NULL
, &port
);
1599 exp
->flags
= NF_CT_EXPECT_PERMANENT
;
1600 exp
->helper
= nf_conntrack_helper_q931
;
1602 if (nf_ct_expect_related(exp
) == 0) {
1603 pr_debug("nf_ct_ras: expect Q.931 ");
1604 nf_ct_dump_tuple(&exp
->tuple
);
1608 nf_ct_expect_put(exp
);
1610 /* Ignore rasAddress */
1615 /****************************************************************************/
1616 static int process_irr(struct sk_buff
*skb
, struct nf_conn
*ct
,
1617 enum ip_conntrack_info ctinfo
,
1618 unsigned char **data
, InfoRequestResponse
*irr
)
1621 typeof(set_ras_addr_hook
) set_ras_addr
;
1622 typeof(set_sig_addr_hook
) set_sig_addr
;
1624 pr_debug("nf_ct_ras: IRR\n");
1626 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1627 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) {
1628 ret
= set_ras_addr(skb
, ct
, ctinfo
, data
,
1629 &irr
->rasAddress
, 1);
1634 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1635 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1636 ret
= set_sig_addr(skb
, ct
, ctinfo
, data
,
1637 irr
->callSignalAddress
.item
,
1638 irr
->callSignalAddress
.count
);
1646 /****************************************************************************/
1647 static int process_ras(struct sk_buff
*skb
, struct nf_conn
*ct
,
1648 enum ip_conntrack_info ctinfo
,
1649 unsigned char **data
, RasMessage
*ras
)
1651 switch (ras
->choice
) {
1652 case eRasMessage_gatekeeperRequest
:
1653 return process_grq(skb
, ct
, ctinfo
, data
,
1654 &ras
->gatekeeperRequest
);
1655 case eRasMessage_gatekeeperConfirm
:
1656 return process_gcf(skb
, ct
, ctinfo
, data
,
1657 &ras
->gatekeeperConfirm
);
1658 case eRasMessage_registrationRequest
:
1659 return process_rrq(skb
, ct
, ctinfo
, data
,
1660 &ras
->registrationRequest
);
1661 case eRasMessage_registrationConfirm
:
1662 return process_rcf(skb
, ct
, ctinfo
, data
,
1663 &ras
->registrationConfirm
);
1664 case eRasMessage_unregistrationRequest
:
1665 return process_urq(skb
, ct
, ctinfo
, data
,
1666 &ras
->unregistrationRequest
);
1667 case eRasMessage_admissionRequest
:
1668 return process_arq(skb
, ct
, ctinfo
, data
,
1669 &ras
->admissionRequest
);
1670 case eRasMessage_admissionConfirm
:
1671 return process_acf(skb
, ct
, ctinfo
, data
,
1672 &ras
->admissionConfirm
);
1673 case eRasMessage_locationRequest
:
1674 return process_lrq(skb
, ct
, ctinfo
, data
,
1675 &ras
->locationRequest
);
1676 case eRasMessage_locationConfirm
:
1677 return process_lcf(skb
, ct
, ctinfo
, data
,
1678 &ras
->locationConfirm
);
1679 case eRasMessage_infoRequestResponse
:
1680 return process_irr(skb
, ct
, ctinfo
, data
,
1681 &ras
->infoRequestResponse
);
1683 pr_debug("nf_ct_ras: RAS message %d\n", ras
->choice
);
1690 /****************************************************************************/
1691 static int ras_help(struct sk_buff
*skb
, unsigned int protoff
,
1692 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
1694 static RasMessage ras
;
1695 unsigned char *data
;
1699 pr_debug("nf_ct_ras: skblen = %u\n", skb
->len
);
1701 spin_lock_bh(&nf_h323_lock
);
1704 data
= get_udp_data(skb
, protoff
, &datalen
);
1707 pr_debug("nf_ct_ras: RAS message len=%d ", datalen
);
1708 nf_ct_dump_tuple(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
1710 /* Decode RAS message */
1711 ret
= DecodeRasMessage(data
, datalen
, &ras
);
1713 pr_debug("nf_ct_ras: decoding error: %s\n",
1714 ret
== H323_ERROR_BOUND
?
1715 "out of bound" : "out of range");
1719 /* Process RAS message */
1720 if (process_ras(skb
, ct
, ctinfo
, &data
, &ras
) < 0)
1724 spin_unlock_bh(&nf_h323_lock
);
1728 spin_unlock_bh(&nf_h323_lock
);
1729 if (net_ratelimit())
1730 pr_info("nf_ct_ras: packet dropped\n");
1734 /****************************************************************************/
1735 static const struct nf_conntrack_expect_policy ras_exp_policy
= {
1740 static struct nf_conntrack_helper nf_conntrack_helper_ras
[] __read_mostly
= {
1744 .tuple
.src
.l3num
= AF_INET
,
1745 .tuple
.src
.u
.udp
.port
= cpu_to_be16(RAS_PORT
),
1746 .tuple
.dst
.protonum
= IPPROTO_UDP
,
1748 .expect_policy
= &ras_exp_policy
,
1753 .tuple
.src
.l3num
= AF_INET6
,
1754 .tuple
.src
.u
.udp
.port
= cpu_to_be16(RAS_PORT
),
1755 .tuple
.dst
.protonum
= IPPROTO_UDP
,
1757 .expect_policy
= &ras_exp_policy
,
1761 /****************************************************************************/
1762 static void __exit
nf_conntrack_h323_fini(void)
1764 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[1]);
1765 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[0]);
1766 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[1]);
1767 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[0]);
1768 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245
);
1770 pr_debug("nf_ct_h323: fini\n");
1773 /****************************************************************************/
1774 static int __init
nf_conntrack_h323_init(void)
1778 h323_buffer
= kmalloc(65536, GFP_KERNEL
);
1781 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_h245
);
1784 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_q931
[0]);
1787 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_q931
[1]);
1790 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_ras
[0]);
1793 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_ras
[1]);
1796 pr_debug("nf_ct_h323: init success\n");
1800 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[0]);
1802 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[1]);
1804 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[0]);
1806 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245
);
1812 /****************************************************************************/
1813 module_init(nf_conntrack_h323_init
);
1814 module_exit(nf_conntrack_h323_fini
);
1816 EXPORT_SYMBOL_GPL(get_h225_addr
);
1817 EXPORT_SYMBOL_GPL(set_h245_addr_hook
);
1818 EXPORT_SYMBOL_GPL(set_h225_addr_hook
);
1819 EXPORT_SYMBOL_GPL(set_sig_addr_hook
);
1820 EXPORT_SYMBOL_GPL(set_ras_addr_hook
);
1821 EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook
);
1822 EXPORT_SYMBOL_GPL(nat_t120_hook
);
1823 EXPORT_SYMBOL_GPL(nat_h245_hook
);
1824 EXPORT_SYMBOL_GPL(nat_callforwarding_hook
);
1825 EXPORT_SYMBOL_GPL(nat_q931_hook
);
1827 MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1828 MODULE_DESCRIPTION("H.323 connection tracking helper");
1829 MODULE_LICENSE("GPL");
1830 MODULE_ALIAS("ip_conntrack_h323");
1831 MODULE_ALIAS_NFCT_HELPER("h323");