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;
198 printk("nf_ct_h323: incomplete TPKT (fragmented?)\n");
202 /* This is the encapsulated data */
204 *datalen
= tpktlen
- 4;
205 *dataoff
= tpktoff
+ 4;
208 /* Clear TPKT length */
209 info
->tpkt_len
[dir
] = 0;
213 info
->tpkt_len
[dir
] = 0;
217 /****************************************************************************/
218 static int get_h245_addr(struct nf_conn
*ct
, const unsigned char *data
,
219 H245_TransportAddress
*taddr
,
220 union nf_inet_addr
*addr
, __be16
*port
)
222 const unsigned char *p
;
225 if (taddr
->choice
!= eH245_TransportAddress_unicastAddress
)
228 switch (taddr
->unicastAddress
.choice
) {
229 case eUnicastAddress_iPAddress
:
230 if (nf_ct_l3num(ct
) != AF_INET
)
232 p
= data
+ taddr
->unicastAddress
.iPAddress
.network
;
235 case eUnicastAddress_iP6Address
:
236 if (nf_ct_l3num(ct
) != AF_INET6
)
238 p
= data
+ taddr
->unicastAddress
.iP6Address
.network
;
245 memcpy(addr
, p
, len
);
246 memset((void *)addr
+ len
, 0, sizeof(*addr
) - len
);
247 memcpy(port
, p
+ len
, sizeof(__be16
));
252 /****************************************************************************/
253 static int expect_rtp_rtcp(struct sk_buff
*skb
, struct nf_conn
*ct
,
254 enum ip_conntrack_info ctinfo
,
255 unsigned char **data
, int dataoff
,
256 H245_TransportAddress
*taddr
)
258 int dir
= CTINFO2DIR(ctinfo
);
261 __be16 rtp_port
, rtcp_port
;
262 union nf_inet_addr addr
;
263 struct nf_conntrack_expect
*rtp_exp
;
264 struct nf_conntrack_expect
*rtcp_exp
;
265 typeof(nat_rtp_rtcp_hook
) nat_rtp_rtcp
;
267 /* Read RTP or RTCP address */
268 if (!get_h245_addr(ct
, *data
, taddr
, &addr
, &port
) ||
269 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) ||
273 /* RTP port is even */
276 rtcp_port
= htons(ntohs(port
) + 1);
278 /* Create expect for RTP */
279 if ((rtp_exp
= nf_ct_expect_alloc(ct
)) == NULL
)
281 nf_ct_expect_init(rtp_exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
282 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
283 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
284 IPPROTO_UDP
, NULL
, &rtp_port
);
286 /* Create expect for RTCP */
287 if ((rtcp_exp
= nf_ct_expect_alloc(ct
)) == NULL
) {
288 nf_ct_expect_put(rtp_exp
);
291 nf_ct_expect_init(rtcp_exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
292 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
293 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
294 IPPROTO_UDP
, NULL
, &rtcp_port
);
296 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
297 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
298 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
299 (nat_rtp_rtcp
= rcu_dereference(nat_rtp_rtcp_hook
)) &&
300 ct
->status
& IPS_NAT_MASK
) {
302 ret
= nat_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
303 taddr
, port
, rtp_port
, rtp_exp
, rtcp_exp
);
304 } else { /* Conntrack only */
305 if (nf_ct_expect_related(rtp_exp
) == 0) {
306 if (nf_ct_expect_related(rtcp_exp
) == 0) {
307 pr_debug("nf_ct_h323: expect RTP ");
308 nf_ct_dump_tuple(&rtp_exp
->tuple
);
309 pr_debug("nf_ct_h323: expect RTCP ");
310 nf_ct_dump_tuple(&rtcp_exp
->tuple
);
312 nf_ct_unexpect_related(rtp_exp
);
319 nf_ct_expect_put(rtp_exp
);
320 nf_ct_expect_put(rtcp_exp
);
325 /****************************************************************************/
326 static int expect_t120(struct sk_buff
*skb
,
328 enum ip_conntrack_info ctinfo
,
329 unsigned char **data
, int dataoff
,
330 H245_TransportAddress
*taddr
)
332 int dir
= CTINFO2DIR(ctinfo
);
335 union nf_inet_addr addr
;
336 struct nf_conntrack_expect
*exp
;
337 typeof(nat_t120_hook
) nat_t120
;
339 /* Read T.120 address */
340 if (!get_h245_addr(ct
, *data
, taddr
, &addr
, &port
) ||
341 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) ||
345 /* Create expect for T.120 connections */
346 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
348 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
349 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
350 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
351 IPPROTO_TCP
, NULL
, &port
);
352 exp
->flags
= NF_CT_EXPECT_PERMANENT
; /* Accept multiple channels */
354 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
355 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
356 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
357 (nat_t120
= rcu_dereference(nat_t120_hook
)) &&
358 ct
->status
& IPS_NAT_MASK
) {
360 ret
= nat_t120(skb
, ct
, ctinfo
, data
, dataoff
, taddr
,
362 } else { /* Conntrack only */
363 if (nf_ct_expect_related(exp
) == 0) {
364 pr_debug("nf_ct_h323: expect T.120 ");
365 nf_ct_dump_tuple(&exp
->tuple
);
370 nf_ct_expect_put(exp
);
375 /****************************************************************************/
376 static int process_h245_channel(struct sk_buff
*skb
,
378 enum ip_conntrack_info ctinfo
,
379 unsigned char **data
, int dataoff
,
380 H2250LogicalChannelParameters
*channel
)
384 if (channel
->options
& eH2250LogicalChannelParameters_mediaChannel
) {
386 ret
= expect_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
387 &channel
->mediaChannel
);
393 options
& eH2250LogicalChannelParameters_mediaControlChannel
) {
395 ret
= expect_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
396 &channel
->mediaControlChannel
);
404 /****************************************************************************/
405 static int process_olc(struct sk_buff
*skb
, struct nf_conn
*ct
,
406 enum ip_conntrack_info ctinfo
,
407 unsigned char **data
, int dataoff
,
408 OpenLogicalChannel
*olc
)
412 pr_debug("nf_ct_h323: OpenLogicalChannel\n");
414 if (olc
->forwardLogicalChannelParameters
.multiplexParameters
.choice
==
415 eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters
)
417 ret
= process_h245_channel(skb
, ct
, ctinfo
, data
, dataoff
,
419 forwardLogicalChannelParameters
.
421 h2250LogicalChannelParameters
);
427 eOpenLogicalChannel_reverseLogicalChannelParameters
) &&
428 (olc
->reverseLogicalChannelParameters
.options
&
429 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters
)
430 && (olc
->reverseLogicalChannelParameters
.multiplexParameters
.
432 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters
))
435 process_h245_channel(skb
, ct
, ctinfo
, data
, dataoff
,
437 reverseLogicalChannelParameters
.
439 h2250LogicalChannelParameters
);
444 if ((olc
->options
& eOpenLogicalChannel_separateStack
) &&
445 olc
->forwardLogicalChannelParameters
.dataType
.choice
==
447 olc
->forwardLogicalChannelParameters
.dataType
.data
.application
.
448 choice
== eDataApplicationCapability_application_t120
&&
449 olc
->forwardLogicalChannelParameters
.dataType
.data
.application
.
450 t120
.choice
== eDataProtocolCapability_separateLANStack
&&
451 olc
->separateStack
.networkAddress
.choice
==
452 eNetworkAccessParameters_networkAddress_localAreaAddress
) {
453 ret
= expect_t120(skb
, ct
, ctinfo
, data
, dataoff
,
454 &olc
->separateStack
.networkAddress
.
463 /****************************************************************************/
464 static int process_olca(struct sk_buff
*skb
, struct nf_conn
*ct
,
465 enum ip_conntrack_info ctinfo
,
466 unsigned char **data
, int dataoff
,
467 OpenLogicalChannelAck
*olca
)
469 H2250LogicalChannelAckParameters
*ack
;
472 pr_debug("nf_ct_h323: OpenLogicalChannelAck\n");
475 eOpenLogicalChannelAck_reverseLogicalChannelParameters
) &&
476 (olca
->reverseLogicalChannelParameters
.options
&
477 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters
)
478 && (olca
->reverseLogicalChannelParameters
.multiplexParameters
.
480 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters
))
482 ret
= process_h245_channel(skb
, ct
, ctinfo
, data
, dataoff
,
484 reverseLogicalChannelParameters
.
486 h2250LogicalChannelParameters
);
492 eOpenLogicalChannelAck_forwardMultiplexAckParameters
) &&
493 (olca
->forwardMultiplexAckParameters
.choice
==
494 eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters
))
496 ack
= &olca
->forwardMultiplexAckParameters
.
497 h2250LogicalChannelAckParameters
;
499 eH2250LogicalChannelAckParameters_mediaChannel
) {
501 ret
= expect_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
508 eH2250LogicalChannelAckParameters_mediaControlChannel
) {
510 ret
= expect_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
511 &ack
->mediaControlChannel
);
517 if ((olca
->options
& eOpenLogicalChannelAck_separateStack
) &&
518 olca
->separateStack
.networkAddress
.choice
==
519 eNetworkAccessParameters_networkAddress_localAreaAddress
) {
520 ret
= expect_t120(skb
, ct
, ctinfo
, data
, dataoff
,
521 &olca
->separateStack
.networkAddress
.
530 /****************************************************************************/
531 static int process_h245(struct sk_buff
*skb
, struct nf_conn
*ct
,
532 enum ip_conntrack_info ctinfo
,
533 unsigned char **data
, int dataoff
,
534 MultimediaSystemControlMessage
*mscm
)
536 switch (mscm
->choice
) {
537 case eMultimediaSystemControlMessage_request
:
538 if (mscm
->request
.choice
==
539 eRequestMessage_openLogicalChannel
) {
540 return process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
541 &mscm
->request
.openLogicalChannel
);
543 pr_debug("nf_ct_h323: H.245 Request %d\n",
544 mscm
->request
.choice
);
546 case eMultimediaSystemControlMessage_response
:
547 if (mscm
->response
.choice
==
548 eResponseMessage_openLogicalChannelAck
) {
549 return process_olca(skb
, ct
, ctinfo
, data
, dataoff
,
551 openLogicalChannelAck
);
553 pr_debug("nf_ct_h323: H.245 Response %d\n",
554 mscm
->response
.choice
);
557 pr_debug("nf_ct_h323: H.245 signal %d\n", mscm
->choice
);
564 /****************************************************************************/
565 static int h245_help(struct sk_buff
*skb
, unsigned int protoff
,
566 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
568 static MultimediaSystemControlMessage mscm
;
569 unsigned char *data
= NULL
;
574 /* Until there's been traffic both ways, don't look in packets. */
575 if (ctinfo
!= IP_CT_ESTABLISHED
&&
576 ctinfo
!= IP_CT_ESTABLISHED
+ IP_CT_IS_REPLY
) {
579 pr_debug("nf_ct_h245: skblen = %u\n", skb
->len
);
581 spin_lock_bh(&nf_h323_lock
);
583 /* Process each TPKT */
584 while (get_tpkt_data(skb
, protoff
, ct
, ctinfo
,
585 &data
, &datalen
, &dataoff
)) {
586 pr_debug("nf_ct_h245: TPKT len=%d ", datalen
);
587 nf_ct_dump_tuple(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
589 /* Decode H.245 signal */
590 ret
= DecodeMultimediaSystemControlMessage(data
, datalen
,
593 pr_debug("nf_ct_h245: decoding error: %s\n",
594 ret
== H323_ERROR_BOUND
?
595 "out of bound" : "out of range");
596 /* We don't drop when decoding error */
600 /* Process H.245 signal */
601 if (process_h245(skb
, ct
, ctinfo
, &data
, dataoff
, &mscm
) < 0)
605 spin_unlock_bh(&nf_h323_lock
);
609 spin_unlock_bh(&nf_h323_lock
);
611 printk("nf_ct_h245: packet dropped\n");
615 /****************************************************************************/
616 static const struct nf_conntrack_expect_policy h245_exp_policy
= {
617 .max_expected
= H323_RTP_CHANNEL_MAX
* 4 + 2 /* T.120 */,
621 static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly
= {
624 .tuple
.src
.l3num
= AF_UNSPEC
,
625 .tuple
.dst
.protonum
= IPPROTO_UDP
,
627 .expect_policy
= &h245_exp_policy
,
630 /****************************************************************************/
631 int get_h225_addr(struct nf_conn
*ct
, unsigned char *data
,
632 TransportAddress
*taddr
,
633 union nf_inet_addr
*addr
, __be16
*port
)
635 const unsigned char *p
;
638 switch (taddr
->choice
) {
639 case eTransportAddress_ipAddress
:
640 if (nf_ct_l3num(ct
) != AF_INET
)
642 p
= data
+ taddr
->ipAddress
.ip
;
645 case eTransportAddress_ip6Address
:
646 if (nf_ct_l3num(ct
) != AF_INET6
)
648 p
= data
+ taddr
->ip6Address
.ip
;
655 memcpy(addr
, p
, len
);
656 memset((void *)addr
+ len
, 0, sizeof(*addr
) - len
);
657 memcpy(port
, p
+ len
, sizeof(__be16
));
662 /****************************************************************************/
663 static int expect_h245(struct sk_buff
*skb
, struct nf_conn
*ct
,
664 enum ip_conntrack_info ctinfo
,
665 unsigned char **data
, int dataoff
,
666 TransportAddress
*taddr
)
668 int dir
= CTINFO2DIR(ctinfo
);
671 union nf_inet_addr addr
;
672 struct nf_conntrack_expect
*exp
;
673 typeof(nat_h245_hook
) nat_h245
;
675 /* Read h245Address */
676 if (!get_h225_addr(ct
, *data
, taddr
, &addr
, &port
) ||
677 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) ||
681 /* Create expect for h245 connection */
682 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
684 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
685 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
686 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
687 IPPROTO_TCP
, NULL
, &port
);
688 exp
->helper
= &nf_conntrack_helper_h245
;
690 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
691 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
692 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
693 (nat_h245
= rcu_dereference(nat_h245_hook
)) &&
694 ct
->status
& IPS_NAT_MASK
) {
696 ret
= nat_h245(skb
, ct
, ctinfo
, data
, dataoff
, taddr
,
698 } else { /* Conntrack only */
699 if (nf_ct_expect_related(exp
) == 0) {
700 pr_debug("nf_ct_q931: expect H.245 ");
701 nf_ct_dump_tuple(&exp
->tuple
);
706 nf_ct_expect_put(exp
);
711 /* If the calling party is on the same side of the forward-to party,
712 * we don't need to track the second call */
713 static int callforward_do_filter(const union nf_inet_addr
*src
,
714 const union nf_inet_addr
*dst
,
717 const struct nf_afinfo
*afinfo
;
718 struct flowi fl1
, fl2
;
721 /* rcu_read_lock()ed by nf_hook_slow() */
722 afinfo
= nf_get_afinfo(family
);
726 memset(&fl1
, 0, sizeof(fl1
));
727 memset(&fl2
, 0, sizeof(fl2
));
731 struct rtable
*rt1
, *rt2
;
733 fl1
.fl4_dst
= src
->ip
;
734 fl2
.fl4_dst
= dst
->ip
;
735 if (!afinfo
->route((struct dst_entry
**)&rt1
, &fl1
)) {
736 if (!afinfo
->route((struct dst_entry
**)&rt2
, &fl2
)) {
737 if (rt1
->rt_gateway
== rt2
->rt_gateway
&&
738 rt1
->u
.dst
.dev
== rt2
->u
.dst
.dev
)
740 dst_release(&rt2
->u
.dst
);
742 dst_release(&rt1
->u
.dst
);
746 #if defined(CONFIG_NF_CONNTRACK_IPV6) || \
747 defined(CONFIG_NF_CONNTRACK_IPV6_MODULE)
749 struct rt6_info
*rt1
, *rt2
;
751 memcpy(&fl1
.fl6_dst
, src
, sizeof(fl1
.fl6_dst
));
752 memcpy(&fl2
.fl6_dst
, dst
, sizeof(fl2
.fl6_dst
));
753 if (!afinfo
->route((struct dst_entry
**)&rt1
, &fl1
)) {
754 if (!afinfo
->route((struct dst_entry
**)&rt2
, &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
*skb
,
774 enum ip_conntrack_info ctinfo
,
775 unsigned char **data
, int dataoff
,
776 TransportAddress
*taddr
)
778 int dir
= CTINFO2DIR(ctinfo
);
781 union nf_inet_addr 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
,
794 pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
798 /* Create expect for the second call leg */
799 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
801 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
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(skb
, ct
, ctinfo
, data
, dataoff
,
814 } else { /* Conntrack only */
815 if (nf_ct_expect_related(exp
) == 0) {
816 pr_debug("nf_ct_q931: expect Call Forwarding ");
817 nf_ct_dump_tuple(&exp
->tuple
);
822 nf_ct_expect_put(exp
);
827 /****************************************************************************/
828 static int process_setup(struct sk_buff
*skb
, struct nf_conn
*ct
,
829 enum ip_conntrack_info ctinfo
,
830 unsigned char **data
, int dataoff
,
833 int dir
= CTINFO2DIR(ctinfo
);
837 union nf_inet_addr addr
;
838 typeof(set_h225_addr_hook
) set_h225_addr
;
840 pr_debug("nf_ct_q931: Setup\n");
842 if (setup
->options
& eSetup_UUIE_h245Address
) {
843 ret
= expect_h245(skb
, 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 pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n",
856 &addr
, ntohs(port
), &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
857 ntohs(ct
->tuplehash
[!dir
].tuple
.src
.u
.tcp
.port
));
858 ret
= set_h225_addr(skb
, data
, dataoff
,
859 &setup
->destCallSignalAddress
,
860 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
861 ct
->tuplehash
[!dir
].tuple
.src
.u
.tcp
.port
);
866 if ((setup
->options
& eSetup_UUIE_sourceCallSignalAddress
) &&
867 (set_h225_addr
) && ct
->status
& IPS_NAT_MASK
&&
868 get_h225_addr(ct
, *data
, &setup
->sourceCallSignalAddress
,
870 memcmp(&addr
, &ct
->tuplehash
[!dir
].tuple
.dst
.u3
, sizeof(addr
))) {
871 pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n",
872 &addr
, ntohs(port
), &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
873 ntohs(ct
->tuplehash
[!dir
].tuple
.dst
.u
.tcp
.port
));
874 ret
= set_h225_addr(skb
, data
, dataoff
,
875 &setup
->sourceCallSignalAddress
,
876 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
877 ct
->tuplehash
[!dir
].tuple
.dst
.u
.tcp
.port
);
882 if (setup
->options
& eSetup_UUIE_fastStart
) {
883 for (i
= 0; i
< setup
->fastStart
.count
; i
++) {
884 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
885 &setup
->fastStart
.item
[i
]);
894 /****************************************************************************/
895 static int process_callproceeding(struct sk_buff
*skb
,
897 enum ip_conntrack_info ctinfo
,
898 unsigned char **data
, int dataoff
,
899 CallProceeding_UUIE
*callproc
)
904 pr_debug("nf_ct_q931: CallProceeding\n");
906 if (callproc
->options
& eCallProceeding_UUIE_h245Address
) {
907 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
908 &callproc
->h245Address
);
913 if (callproc
->options
& eCallProceeding_UUIE_fastStart
) {
914 for (i
= 0; i
< callproc
->fastStart
.count
; i
++) {
915 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
916 &callproc
->fastStart
.item
[i
]);
925 /****************************************************************************/
926 static int process_connect(struct sk_buff
*skb
, struct nf_conn
*ct
,
927 enum ip_conntrack_info ctinfo
,
928 unsigned char **data
, int dataoff
,
929 Connect_UUIE
*connect
)
934 pr_debug("nf_ct_q931: Connect\n");
936 if (connect
->options
& eConnect_UUIE_h245Address
) {
937 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
938 &connect
->h245Address
);
943 if (connect
->options
& eConnect_UUIE_fastStart
) {
944 for (i
= 0; i
< connect
->fastStart
.count
; i
++) {
945 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
946 &connect
->fastStart
.item
[i
]);
955 /****************************************************************************/
956 static int process_alerting(struct sk_buff
*skb
, struct nf_conn
*ct
,
957 enum ip_conntrack_info ctinfo
,
958 unsigned char **data
, int dataoff
,
959 Alerting_UUIE
*alert
)
964 pr_debug("nf_ct_q931: Alerting\n");
966 if (alert
->options
& eAlerting_UUIE_h245Address
) {
967 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
968 &alert
->h245Address
);
973 if (alert
->options
& eAlerting_UUIE_fastStart
) {
974 for (i
= 0; i
< alert
->fastStart
.count
; i
++) {
975 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
976 &alert
->fastStart
.item
[i
]);
985 /****************************************************************************/
986 static int process_facility(struct sk_buff
*skb
, struct nf_conn
*ct
,
987 enum ip_conntrack_info ctinfo
,
988 unsigned char **data
, int dataoff
,
989 Facility_UUIE
*facility
)
994 pr_debug("nf_ct_q931: Facility\n");
996 if (facility
->reason
.choice
== eFacilityReason_callForwarded
) {
997 if (facility
->options
& eFacility_UUIE_alternativeAddress
)
998 return expect_callforwarding(skb
, ct
, ctinfo
, data
,
1001 alternativeAddress
);
1005 if (facility
->options
& eFacility_UUIE_h245Address
) {
1006 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
1007 &facility
->h245Address
);
1012 if (facility
->options
& eFacility_UUIE_fastStart
) {
1013 for (i
= 0; i
< facility
->fastStart
.count
; i
++) {
1014 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
1015 &facility
->fastStart
.item
[i
]);
1024 /****************************************************************************/
1025 static int process_progress(struct sk_buff
*skb
, struct nf_conn
*ct
,
1026 enum ip_conntrack_info ctinfo
,
1027 unsigned char **data
, int dataoff
,
1028 Progress_UUIE
*progress
)
1033 pr_debug("nf_ct_q931: Progress\n");
1035 if (progress
->options
& eProgress_UUIE_h245Address
) {
1036 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
1037 &progress
->h245Address
);
1042 if (progress
->options
& eProgress_UUIE_fastStart
) {
1043 for (i
= 0; i
< progress
->fastStart
.count
; i
++) {
1044 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
1045 &progress
->fastStart
.item
[i
]);
1054 /****************************************************************************/
1055 static int process_q931(struct sk_buff
*skb
, struct nf_conn
*ct
,
1056 enum ip_conntrack_info ctinfo
,
1057 unsigned char **data
, int dataoff
, Q931
*q931
)
1059 H323_UU_PDU
*pdu
= &q931
->UUIE
.h323_uu_pdu
;
1063 switch (pdu
->h323_message_body
.choice
) {
1064 case eH323_UU_PDU_h323_message_body_setup
:
1065 ret
= process_setup(skb
, ct
, ctinfo
, data
, dataoff
,
1066 &pdu
->h323_message_body
.setup
);
1068 case eH323_UU_PDU_h323_message_body_callProceeding
:
1069 ret
= process_callproceeding(skb
, ct
, ctinfo
, data
, dataoff
,
1070 &pdu
->h323_message_body
.
1073 case eH323_UU_PDU_h323_message_body_connect
:
1074 ret
= process_connect(skb
, ct
, ctinfo
, data
, dataoff
,
1075 &pdu
->h323_message_body
.connect
);
1077 case eH323_UU_PDU_h323_message_body_alerting
:
1078 ret
= process_alerting(skb
, ct
, ctinfo
, data
, dataoff
,
1079 &pdu
->h323_message_body
.alerting
);
1081 case eH323_UU_PDU_h323_message_body_facility
:
1082 ret
= process_facility(skb
, ct
, ctinfo
, data
, dataoff
,
1083 &pdu
->h323_message_body
.facility
);
1085 case eH323_UU_PDU_h323_message_body_progress
:
1086 ret
= process_progress(skb
, ct
, ctinfo
, data
, dataoff
,
1087 &pdu
->h323_message_body
.progress
);
1090 pr_debug("nf_ct_q931: Q.931 signal %d\n",
1091 pdu
->h323_message_body
.choice
);
1098 if (pdu
->options
& eH323_UU_PDU_h245Control
) {
1099 for (i
= 0; i
< pdu
->h245Control
.count
; i
++) {
1100 ret
= process_h245(skb
, ct
, ctinfo
, data
, dataoff
,
1101 &pdu
->h245Control
.item
[i
]);
1110 /****************************************************************************/
1111 static int q931_help(struct sk_buff
*skb
, unsigned int protoff
,
1112 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
1115 unsigned char *data
= NULL
;
1120 /* Until there's been traffic both ways, don't look in packets. */
1121 if (ctinfo
!= IP_CT_ESTABLISHED
&&
1122 ctinfo
!= IP_CT_ESTABLISHED
+ IP_CT_IS_REPLY
) {
1125 pr_debug("nf_ct_q931: skblen = %u\n", skb
->len
);
1127 spin_lock_bh(&nf_h323_lock
);
1129 /* Process each TPKT */
1130 while (get_tpkt_data(skb
, protoff
, ct
, ctinfo
,
1131 &data
, &datalen
, &dataoff
)) {
1132 pr_debug("nf_ct_q931: TPKT len=%d ", datalen
);
1133 nf_ct_dump_tuple(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
1135 /* Decode Q.931 signal */
1136 ret
= DecodeQ931(data
, datalen
, &q931
);
1138 pr_debug("nf_ct_q931: decoding error: %s\n",
1139 ret
== H323_ERROR_BOUND
?
1140 "out of bound" : "out of range");
1141 /* We don't drop when decoding error */
1145 /* Process Q.931 signal */
1146 if (process_q931(skb
, ct
, ctinfo
, &data
, dataoff
, &q931
) < 0)
1150 spin_unlock_bh(&nf_h323_lock
);
1154 spin_unlock_bh(&nf_h323_lock
);
1155 if (net_ratelimit())
1156 printk("nf_ct_q931: packet dropped\n");
1160 /****************************************************************************/
1161 static const struct nf_conntrack_expect_policy q931_exp_policy
= {
1162 /* T.120 and H.245 */
1163 .max_expected
= H323_RTP_CHANNEL_MAX
* 4 + 4,
1167 static struct nf_conntrack_helper nf_conntrack_helper_q931
[] __read_mostly
= {
1171 .tuple
.src
.l3num
= AF_INET
,
1172 .tuple
.src
.u
.tcp
.port
= cpu_to_be16(Q931_PORT
),
1173 .tuple
.dst
.protonum
= IPPROTO_TCP
,
1175 .expect_policy
= &q931_exp_policy
,
1180 .tuple
.src
.l3num
= AF_INET6
,
1181 .tuple
.src
.u
.tcp
.port
= cpu_to_be16(Q931_PORT
),
1182 .tuple
.dst
.protonum
= IPPROTO_TCP
,
1184 .expect_policy
= &q931_exp_policy
,
1188 /****************************************************************************/
1189 static unsigned char *get_udp_data(struct sk_buff
*skb
, unsigned int protoff
,
1192 const struct udphdr
*uh
;
1196 uh
= skb_header_pointer(skb
, protoff
, sizeof(_uh
), &_uh
);
1199 dataoff
= protoff
+ sizeof(_uh
);
1200 if (dataoff
>= skb
->len
)
1202 *datalen
= skb
->len
- dataoff
;
1203 return skb_header_pointer(skb
, dataoff
, *datalen
, h323_buffer
);
1206 /****************************************************************************/
1207 static struct nf_conntrack_expect
*find_expect(struct nf_conn
*ct
,
1208 union nf_inet_addr
*addr
,
1211 struct net
*net
= nf_ct_net(ct
);
1212 struct nf_conntrack_expect
*exp
;
1213 struct nf_conntrack_tuple tuple
;
1215 memset(&tuple
.src
.u3
, 0, sizeof(tuple
.src
.u3
));
1216 tuple
.src
.u
.tcp
.port
= 0;
1217 memcpy(&tuple
.dst
.u3
, addr
, sizeof(tuple
.dst
.u3
));
1218 tuple
.dst
.u
.tcp
.port
= port
;
1219 tuple
.dst
.protonum
= IPPROTO_TCP
;
1221 exp
= __nf_ct_expect_find(net
, nf_ct_zone(ct
), &tuple
);
1222 if (exp
&& exp
->master
== ct
)
1227 /****************************************************************************/
1228 static int set_expect_timeout(struct nf_conntrack_expect
*exp
,
1231 if (!exp
|| !del_timer(&exp
->timeout
))
1234 exp
->timeout
.expires
= jiffies
+ timeout
* HZ
;
1235 add_timer(&exp
->timeout
);
1240 /****************************************************************************/
1241 static int expect_q931(struct sk_buff
*skb
, struct nf_conn
*ct
,
1242 enum ip_conntrack_info ctinfo
,
1243 unsigned char **data
,
1244 TransportAddress
*taddr
, int count
)
1246 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1247 int dir
= CTINFO2DIR(ctinfo
);
1251 union nf_inet_addr addr
;
1252 struct nf_conntrack_expect
*exp
;
1253 typeof(nat_q931_hook
) nat_q931
;
1255 /* Look for the first related address */
1256 for (i
= 0; i
< count
; i
++) {
1257 if (get_h225_addr(ct
, *data
, &taddr
[i
], &addr
, &port
) &&
1258 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
,
1259 sizeof(addr
)) == 0 && port
!= 0)
1263 if (i
>= count
) /* Not found */
1266 /* Create expect for Q.931 */
1267 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1269 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1270 gkrouted_only
? /* only accept calls from GK? */
1271 &ct
->tuplehash
[!dir
].tuple
.src
.u3
: NULL
,
1272 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1273 IPPROTO_TCP
, NULL
, &port
);
1274 exp
->helper
= nf_conntrack_helper_q931
;
1275 exp
->flags
= NF_CT_EXPECT_PERMANENT
; /* Accept multiple calls */
1277 nat_q931
= rcu_dereference(nat_q931_hook
);
1278 if (nat_q931
&& ct
->status
& IPS_NAT_MASK
) { /* Need NAT */
1279 ret
= nat_q931(skb
, ct
, ctinfo
, data
, taddr
, i
, port
, exp
);
1280 } else { /* Conntrack only */
1281 if (nf_ct_expect_related(exp
) == 0) {
1282 pr_debug("nf_ct_ras: expect Q.931 ");
1283 nf_ct_dump_tuple(&exp
->tuple
);
1285 /* Save port for looking up expect in processing RCF */
1286 info
->sig_port
[dir
] = port
;
1291 nf_ct_expect_put(exp
);
1296 /****************************************************************************/
1297 static int process_grq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1298 enum ip_conntrack_info ctinfo
,
1299 unsigned char **data
, GatekeeperRequest
*grq
)
1301 typeof(set_ras_addr_hook
) set_ras_addr
;
1303 pr_debug("nf_ct_ras: GRQ\n");
1305 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1306 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) /* NATed */
1307 return set_ras_addr(skb
, ct
, ctinfo
, data
,
1308 &grq
->rasAddress
, 1);
1312 /****************************************************************************/
1313 static int process_gcf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1314 enum ip_conntrack_info ctinfo
,
1315 unsigned char **data
, GatekeeperConfirm
*gcf
)
1317 int dir
= CTINFO2DIR(ctinfo
);
1320 union nf_inet_addr addr
;
1321 struct nf_conntrack_expect
*exp
;
1323 pr_debug("nf_ct_ras: GCF\n");
1325 if (!get_h225_addr(ct
, *data
, &gcf
->rasAddress
, &addr
, &port
))
1328 /* Registration port is the same as discovery port */
1329 if (!memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1330 port
== ct
->tuplehash
[dir
].tuple
.src
.u
.udp
.port
)
1333 /* Avoid RAS expectation loops. A GCF is never expected. */
1334 if (test_bit(IPS_EXPECTED_BIT
, &ct
->status
))
1337 /* Need new expect */
1338 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1340 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1341 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1342 IPPROTO_UDP
, NULL
, &port
);
1343 exp
->helper
= nf_conntrack_helper_ras
;
1345 if (nf_ct_expect_related(exp
) == 0) {
1346 pr_debug("nf_ct_ras: expect RAS ");
1347 nf_ct_dump_tuple(&exp
->tuple
);
1351 nf_ct_expect_put(exp
);
1356 /****************************************************************************/
1357 static int process_rrq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1358 enum ip_conntrack_info ctinfo
,
1359 unsigned char **data
, RegistrationRequest
*rrq
)
1361 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1363 typeof(set_ras_addr_hook
) set_ras_addr
;
1365 pr_debug("nf_ct_ras: RRQ\n");
1367 ret
= expect_q931(skb
, ct
, ctinfo
, data
,
1368 rrq
->callSignalAddress
.item
,
1369 rrq
->callSignalAddress
.count
);
1373 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1374 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) {
1375 ret
= set_ras_addr(skb
, ct
, ctinfo
, data
,
1376 rrq
->rasAddress
.item
,
1377 rrq
->rasAddress
.count
);
1382 if (rrq
->options
& eRegistrationRequest_timeToLive
) {
1383 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq
->timeToLive
);
1384 info
->timeout
= rrq
->timeToLive
;
1386 info
->timeout
= default_rrq_ttl
;
1391 /****************************************************************************/
1392 static int process_rcf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1393 enum ip_conntrack_info ctinfo
,
1394 unsigned char **data
, RegistrationConfirm
*rcf
)
1396 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1397 int dir
= CTINFO2DIR(ctinfo
);
1399 struct nf_conntrack_expect
*exp
;
1400 typeof(set_sig_addr_hook
) set_sig_addr
;
1402 pr_debug("nf_ct_ras: RCF\n");
1404 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1405 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1406 ret
= set_sig_addr(skb
, ct
, ctinfo
, data
,
1407 rcf
->callSignalAddress
.item
,
1408 rcf
->callSignalAddress
.count
);
1413 if (rcf
->options
& eRegistrationConfirm_timeToLive
) {
1414 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf
->timeToLive
);
1415 info
->timeout
= rcf
->timeToLive
;
1418 if (info
->timeout
> 0) {
1419 pr_debug("nf_ct_ras: set RAS connection timeout to "
1420 "%u seconds\n", info
->timeout
);
1421 nf_ct_refresh(ct
, skb
, info
->timeout
* HZ
);
1423 /* Set expect timeout */
1424 spin_lock_bh(&nf_conntrack_lock
);
1425 exp
= find_expect(ct
, &ct
->tuplehash
[dir
].tuple
.dst
.u3
,
1426 info
->sig_port
[!dir
]);
1428 pr_debug("nf_ct_ras: set Q.931 expect "
1429 "timeout to %u seconds for",
1431 nf_ct_dump_tuple(&exp
->tuple
);
1432 set_expect_timeout(exp
, info
->timeout
);
1434 spin_unlock_bh(&nf_conntrack_lock
);
1440 /****************************************************************************/
1441 static int process_urq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1442 enum ip_conntrack_info ctinfo
,
1443 unsigned char **data
, UnregistrationRequest
*urq
)
1445 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1446 int dir
= CTINFO2DIR(ctinfo
);
1448 typeof(set_sig_addr_hook
) set_sig_addr
;
1450 pr_debug("nf_ct_ras: URQ\n");
1452 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1453 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1454 ret
= set_sig_addr(skb
, ct
, ctinfo
, data
,
1455 urq
->callSignalAddress
.item
,
1456 urq
->callSignalAddress
.count
);
1461 /* Clear old expect */
1462 nf_ct_remove_expectations(ct
);
1463 info
->sig_port
[dir
] = 0;
1464 info
->sig_port
[!dir
] = 0;
1466 /* Give it 30 seconds for UCF or URJ */
1467 nf_ct_refresh(ct
, skb
, 30 * HZ
);
1472 /****************************************************************************/
1473 static int process_arq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1474 enum ip_conntrack_info ctinfo
,
1475 unsigned char **data
, AdmissionRequest
*arq
)
1477 const struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1478 int dir
= CTINFO2DIR(ctinfo
);
1480 union nf_inet_addr addr
;
1481 typeof(set_h225_addr_hook
) set_h225_addr
;
1483 pr_debug("nf_ct_ras: ARQ\n");
1485 set_h225_addr
= rcu_dereference(set_h225_addr_hook
);
1486 if ((arq
->options
& eAdmissionRequest_destCallSignalAddress
) &&
1487 get_h225_addr(ct
, *data
, &arq
->destCallSignalAddress
,
1489 !memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1490 port
== info
->sig_port
[dir
] &&
1491 set_h225_addr
&& ct
->status
& IPS_NAT_MASK
) {
1493 return set_h225_addr(skb
, data
, 0,
1494 &arq
->destCallSignalAddress
,
1495 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1496 info
->sig_port
[!dir
]);
1499 if ((arq
->options
& eAdmissionRequest_srcCallSignalAddress
) &&
1500 get_h225_addr(ct
, *data
, &arq
->srcCallSignalAddress
,
1502 !memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1503 set_h225_addr
&& ct
->status
& IPS_NAT_MASK
) {
1505 return set_h225_addr(skb
, data
, 0,
1506 &arq
->srcCallSignalAddress
,
1507 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1514 /****************************************************************************/
1515 static int process_acf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1516 enum ip_conntrack_info ctinfo
,
1517 unsigned char **data
, AdmissionConfirm
*acf
)
1519 int dir
= CTINFO2DIR(ctinfo
);
1522 union nf_inet_addr addr
;
1523 struct nf_conntrack_expect
*exp
;
1524 typeof(set_sig_addr_hook
) set_sig_addr
;
1526 pr_debug("nf_ct_ras: ACF\n");
1528 if (!get_h225_addr(ct
, *data
, &acf
->destCallSignalAddress
,
1532 if (!memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.dst
.u3
, sizeof(addr
))) {
1534 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1535 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
)
1536 return set_sig_addr(skb
, ct
, ctinfo
, data
,
1537 &acf
->destCallSignalAddress
, 1);
1541 /* Need new expect */
1542 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1544 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1545 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1546 IPPROTO_TCP
, NULL
, &port
);
1547 exp
->flags
= NF_CT_EXPECT_PERMANENT
;
1548 exp
->helper
= nf_conntrack_helper_q931
;
1550 if (nf_ct_expect_related(exp
) == 0) {
1551 pr_debug("nf_ct_ras: expect Q.931 ");
1552 nf_ct_dump_tuple(&exp
->tuple
);
1556 nf_ct_expect_put(exp
);
1561 /****************************************************************************/
1562 static int process_lrq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1563 enum ip_conntrack_info ctinfo
,
1564 unsigned char **data
, LocationRequest
*lrq
)
1566 typeof(set_ras_addr_hook
) set_ras_addr
;
1568 pr_debug("nf_ct_ras: LRQ\n");
1570 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1571 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
)
1572 return set_ras_addr(skb
, ct
, ctinfo
, data
,
1573 &lrq
->replyAddress
, 1);
1577 /****************************************************************************/
1578 static int process_lcf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1579 enum ip_conntrack_info ctinfo
,
1580 unsigned char **data
, LocationConfirm
*lcf
)
1582 int dir
= CTINFO2DIR(ctinfo
);
1585 union nf_inet_addr addr
;
1586 struct nf_conntrack_expect
*exp
;
1588 pr_debug("nf_ct_ras: LCF\n");
1590 if (!get_h225_addr(ct
, *data
, &lcf
->callSignalAddress
,
1594 /* Need new expect for call signal */
1595 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1597 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1598 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1599 IPPROTO_TCP
, NULL
, &port
);
1600 exp
->flags
= NF_CT_EXPECT_PERMANENT
;
1601 exp
->helper
= nf_conntrack_helper_q931
;
1603 if (nf_ct_expect_related(exp
) == 0) {
1604 pr_debug("nf_ct_ras: expect Q.931 ");
1605 nf_ct_dump_tuple(&exp
->tuple
);
1609 nf_ct_expect_put(exp
);
1611 /* Ignore rasAddress */
1616 /****************************************************************************/
1617 static int process_irr(struct sk_buff
*skb
, struct nf_conn
*ct
,
1618 enum ip_conntrack_info ctinfo
,
1619 unsigned char **data
, InfoRequestResponse
*irr
)
1622 typeof(set_ras_addr_hook
) set_ras_addr
;
1623 typeof(set_sig_addr_hook
) set_sig_addr
;
1625 pr_debug("nf_ct_ras: IRR\n");
1627 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1628 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) {
1629 ret
= set_ras_addr(skb
, ct
, ctinfo
, data
,
1630 &irr
->rasAddress
, 1);
1635 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1636 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1637 ret
= set_sig_addr(skb
, ct
, ctinfo
, data
,
1638 irr
->callSignalAddress
.item
,
1639 irr
->callSignalAddress
.count
);
1647 /****************************************************************************/
1648 static int process_ras(struct sk_buff
*skb
, struct nf_conn
*ct
,
1649 enum ip_conntrack_info ctinfo
,
1650 unsigned char **data
, RasMessage
*ras
)
1652 switch (ras
->choice
) {
1653 case eRasMessage_gatekeeperRequest
:
1654 return process_grq(skb
, ct
, ctinfo
, data
,
1655 &ras
->gatekeeperRequest
);
1656 case eRasMessage_gatekeeperConfirm
:
1657 return process_gcf(skb
, ct
, ctinfo
, data
,
1658 &ras
->gatekeeperConfirm
);
1659 case eRasMessage_registrationRequest
:
1660 return process_rrq(skb
, ct
, ctinfo
, data
,
1661 &ras
->registrationRequest
);
1662 case eRasMessage_registrationConfirm
:
1663 return process_rcf(skb
, ct
, ctinfo
, data
,
1664 &ras
->registrationConfirm
);
1665 case eRasMessage_unregistrationRequest
:
1666 return process_urq(skb
, ct
, ctinfo
, data
,
1667 &ras
->unregistrationRequest
);
1668 case eRasMessage_admissionRequest
:
1669 return process_arq(skb
, ct
, ctinfo
, data
,
1670 &ras
->admissionRequest
);
1671 case eRasMessage_admissionConfirm
:
1672 return process_acf(skb
, ct
, ctinfo
, data
,
1673 &ras
->admissionConfirm
);
1674 case eRasMessage_locationRequest
:
1675 return process_lrq(skb
, ct
, ctinfo
, data
,
1676 &ras
->locationRequest
);
1677 case eRasMessage_locationConfirm
:
1678 return process_lcf(skb
, ct
, ctinfo
, data
,
1679 &ras
->locationConfirm
);
1680 case eRasMessage_infoRequestResponse
:
1681 return process_irr(skb
, ct
, ctinfo
, data
,
1682 &ras
->infoRequestResponse
);
1684 pr_debug("nf_ct_ras: RAS message %d\n", ras
->choice
);
1691 /****************************************************************************/
1692 static int ras_help(struct sk_buff
*skb
, unsigned int protoff
,
1693 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
1695 static RasMessage ras
;
1696 unsigned char *data
;
1700 pr_debug("nf_ct_ras: skblen = %u\n", skb
->len
);
1702 spin_lock_bh(&nf_h323_lock
);
1705 data
= get_udp_data(skb
, protoff
, &datalen
);
1708 pr_debug("nf_ct_ras: RAS message len=%d ", datalen
);
1709 nf_ct_dump_tuple(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
1711 /* Decode RAS message */
1712 ret
= DecodeRasMessage(data
, datalen
, &ras
);
1714 pr_debug("nf_ct_ras: decoding error: %s\n",
1715 ret
== H323_ERROR_BOUND
?
1716 "out of bound" : "out of range");
1720 /* Process RAS message */
1721 if (process_ras(skb
, ct
, ctinfo
, &data
, &ras
) < 0)
1725 spin_unlock_bh(&nf_h323_lock
);
1729 spin_unlock_bh(&nf_h323_lock
);
1730 if (net_ratelimit())
1731 printk("nf_ct_ras: packet dropped\n");
1735 /****************************************************************************/
1736 static const struct nf_conntrack_expect_policy ras_exp_policy
= {
1741 static struct nf_conntrack_helper nf_conntrack_helper_ras
[] __read_mostly
= {
1745 .tuple
.src
.l3num
= AF_INET
,
1746 .tuple
.src
.u
.udp
.port
= cpu_to_be16(RAS_PORT
),
1747 .tuple
.dst
.protonum
= IPPROTO_UDP
,
1749 .expect_policy
= &ras_exp_policy
,
1754 .tuple
.src
.l3num
= AF_INET6
,
1755 .tuple
.src
.u
.udp
.port
= cpu_to_be16(RAS_PORT
),
1756 .tuple
.dst
.protonum
= IPPROTO_UDP
,
1758 .expect_policy
= &ras_exp_policy
,
1762 /****************************************************************************/
1763 static void __exit
nf_conntrack_h323_fini(void)
1765 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[1]);
1766 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[0]);
1767 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[1]);
1768 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[0]);
1769 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245
);
1771 pr_debug("nf_ct_h323: fini\n");
1774 /****************************************************************************/
1775 static int __init
nf_conntrack_h323_init(void)
1779 h323_buffer
= kmalloc(65536, GFP_KERNEL
);
1782 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_h245
);
1785 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_q931
[0]);
1788 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_q931
[1]);
1791 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_ras
[0]);
1794 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_ras
[1]);
1797 pr_debug("nf_ct_h323: init success\n");
1801 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[0]);
1803 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[1]);
1805 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[0]);
1807 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245
);
1813 /****************************************************************************/
1814 module_init(nf_conntrack_h323_init
);
1815 module_exit(nf_conntrack_h323_fini
);
1817 EXPORT_SYMBOL_GPL(get_h225_addr
);
1818 EXPORT_SYMBOL_GPL(set_h245_addr_hook
);
1819 EXPORT_SYMBOL_GPL(set_h225_addr_hook
);
1820 EXPORT_SYMBOL_GPL(set_sig_addr_hook
);
1821 EXPORT_SYMBOL_GPL(set_ras_addr_hook
);
1822 EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook
);
1823 EXPORT_SYMBOL_GPL(nat_t120_hook
);
1824 EXPORT_SYMBOL_GPL(nat_h245_hook
);
1825 EXPORT_SYMBOL_GPL(nat_callforwarding_hook
);
1826 EXPORT_SYMBOL_GPL(nat_q931_hook
);
1828 MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1829 MODULE_DESCRIPTION("H.323 connection tracking helper");
1830 MODULE_LICENSE("GPL");
1831 MODULE_ALIAS("ip_conntrack_h323");
1832 MODULE_ALIAS_NFCT_HELPER("h323");