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 bool callforward_filter __read_mostly
= true;
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_data(ct
);
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 */
273 rtp_port
= port
& ~htons(1);
274 rtcp_port
= port
| htons(1);
276 /* Create expect for RTP */
277 if ((rtp_exp
= nf_ct_expect_alloc(ct
)) == NULL
)
279 nf_ct_expect_init(rtp_exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
280 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
281 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
282 IPPROTO_UDP
, NULL
, &rtp_port
);
284 /* Create expect for RTCP */
285 if ((rtcp_exp
= nf_ct_expect_alloc(ct
)) == NULL
) {
286 nf_ct_expect_put(rtp_exp
);
289 nf_ct_expect_init(rtcp_exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
290 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
291 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
292 IPPROTO_UDP
, NULL
, &rtcp_port
);
294 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
295 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
296 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
297 (nat_rtp_rtcp
= rcu_dereference(nat_rtp_rtcp_hook
)) &&
298 ct
->status
& IPS_NAT_MASK
) {
300 ret
= nat_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
301 taddr
, port
, rtp_port
, rtp_exp
, rtcp_exp
);
302 } else { /* Conntrack only */
303 if (nf_ct_expect_related(rtp_exp
) == 0) {
304 if (nf_ct_expect_related(rtcp_exp
) == 0) {
305 pr_debug("nf_ct_h323: expect RTP ");
306 nf_ct_dump_tuple(&rtp_exp
->tuple
);
307 pr_debug("nf_ct_h323: expect RTCP ");
308 nf_ct_dump_tuple(&rtcp_exp
->tuple
);
310 nf_ct_unexpect_related(rtp_exp
);
317 nf_ct_expect_put(rtp_exp
);
318 nf_ct_expect_put(rtcp_exp
);
323 /****************************************************************************/
324 static int expect_t120(struct sk_buff
*skb
,
326 enum ip_conntrack_info ctinfo
,
327 unsigned char **data
, int dataoff
,
328 H245_TransportAddress
*taddr
)
330 int dir
= CTINFO2DIR(ctinfo
);
333 union nf_inet_addr addr
;
334 struct nf_conntrack_expect
*exp
;
335 typeof(nat_t120_hook
) nat_t120
;
337 /* Read T.120 address */
338 if (!get_h245_addr(ct
, *data
, taddr
, &addr
, &port
) ||
339 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) ||
343 /* Create expect for T.120 connections */
344 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
346 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
347 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
348 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
349 IPPROTO_TCP
, NULL
, &port
);
350 exp
->flags
= NF_CT_EXPECT_PERMANENT
; /* Accept multiple channels */
352 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
353 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
354 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
355 (nat_t120
= rcu_dereference(nat_t120_hook
)) &&
356 ct
->status
& IPS_NAT_MASK
) {
358 ret
= nat_t120(skb
, ct
, ctinfo
, data
, dataoff
, taddr
,
360 } else { /* Conntrack only */
361 if (nf_ct_expect_related(exp
) == 0) {
362 pr_debug("nf_ct_h323: expect T.120 ");
363 nf_ct_dump_tuple(&exp
->tuple
);
368 nf_ct_expect_put(exp
);
373 /****************************************************************************/
374 static int process_h245_channel(struct sk_buff
*skb
,
376 enum ip_conntrack_info ctinfo
,
377 unsigned char **data
, int dataoff
,
378 H2250LogicalChannelParameters
*channel
)
382 if (channel
->options
& eH2250LogicalChannelParameters_mediaChannel
) {
384 ret
= expect_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
385 &channel
->mediaChannel
);
391 options
& eH2250LogicalChannelParameters_mediaControlChannel
) {
393 ret
= expect_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
394 &channel
->mediaControlChannel
);
402 /****************************************************************************/
403 static int process_olc(struct sk_buff
*skb
, struct nf_conn
*ct
,
404 enum ip_conntrack_info ctinfo
,
405 unsigned char **data
, int dataoff
,
406 OpenLogicalChannel
*olc
)
410 pr_debug("nf_ct_h323: OpenLogicalChannel\n");
412 if (olc
->forwardLogicalChannelParameters
.multiplexParameters
.choice
==
413 eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters
)
415 ret
= process_h245_channel(skb
, ct
, ctinfo
, data
, dataoff
,
417 forwardLogicalChannelParameters
.
419 h2250LogicalChannelParameters
);
425 eOpenLogicalChannel_reverseLogicalChannelParameters
) &&
426 (olc
->reverseLogicalChannelParameters
.options
&
427 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters
)
428 && (olc
->reverseLogicalChannelParameters
.multiplexParameters
.
430 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters
))
433 process_h245_channel(skb
, ct
, ctinfo
, data
, dataoff
,
435 reverseLogicalChannelParameters
.
437 h2250LogicalChannelParameters
);
442 if ((olc
->options
& eOpenLogicalChannel_separateStack
) &&
443 olc
->forwardLogicalChannelParameters
.dataType
.choice
==
445 olc
->forwardLogicalChannelParameters
.dataType
.data
.application
.
446 choice
== eDataApplicationCapability_application_t120
&&
447 olc
->forwardLogicalChannelParameters
.dataType
.data
.application
.
448 t120
.choice
== eDataProtocolCapability_separateLANStack
&&
449 olc
->separateStack
.networkAddress
.choice
==
450 eNetworkAccessParameters_networkAddress_localAreaAddress
) {
451 ret
= expect_t120(skb
, ct
, ctinfo
, data
, dataoff
,
452 &olc
->separateStack
.networkAddress
.
461 /****************************************************************************/
462 static int process_olca(struct sk_buff
*skb
, struct nf_conn
*ct
,
463 enum ip_conntrack_info ctinfo
,
464 unsigned char **data
, int dataoff
,
465 OpenLogicalChannelAck
*olca
)
467 H2250LogicalChannelAckParameters
*ack
;
470 pr_debug("nf_ct_h323: OpenLogicalChannelAck\n");
473 eOpenLogicalChannelAck_reverseLogicalChannelParameters
) &&
474 (olca
->reverseLogicalChannelParameters
.options
&
475 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters
)
476 && (olca
->reverseLogicalChannelParameters
.multiplexParameters
.
478 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters
))
480 ret
= process_h245_channel(skb
, ct
, ctinfo
, data
, dataoff
,
482 reverseLogicalChannelParameters
.
484 h2250LogicalChannelParameters
);
490 eOpenLogicalChannelAck_forwardMultiplexAckParameters
) &&
491 (olca
->forwardMultiplexAckParameters
.choice
==
492 eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters
))
494 ack
= &olca
->forwardMultiplexAckParameters
.
495 h2250LogicalChannelAckParameters
;
497 eH2250LogicalChannelAckParameters_mediaChannel
) {
499 ret
= expect_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
506 eH2250LogicalChannelAckParameters_mediaControlChannel
) {
508 ret
= expect_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
509 &ack
->mediaControlChannel
);
515 if ((olca
->options
& eOpenLogicalChannelAck_separateStack
) &&
516 olca
->separateStack
.networkAddress
.choice
==
517 eNetworkAccessParameters_networkAddress_localAreaAddress
) {
518 ret
= expect_t120(skb
, ct
, ctinfo
, data
, dataoff
,
519 &olca
->separateStack
.networkAddress
.
528 /****************************************************************************/
529 static int process_h245(struct sk_buff
*skb
, struct nf_conn
*ct
,
530 enum ip_conntrack_info ctinfo
,
531 unsigned char **data
, int dataoff
,
532 MultimediaSystemControlMessage
*mscm
)
534 switch (mscm
->choice
) {
535 case eMultimediaSystemControlMessage_request
:
536 if (mscm
->request
.choice
==
537 eRequestMessage_openLogicalChannel
) {
538 return process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
539 &mscm
->request
.openLogicalChannel
);
541 pr_debug("nf_ct_h323: H.245 Request %d\n",
542 mscm
->request
.choice
);
544 case eMultimediaSystemControlMessage_response
:
545 if (mscm
->response
.choice
==
546 eResponseMessage_openLogicalChannelAck
) {
547 return process_olca(skb
, ct
, ctinfo
, data
, dataoff
,
549 openLogicalChannelAck
);
551 pr_debug("nf_ct_h323: H.245 Response %d\n",
552 mscm
->response
.choice
);
555 pr_debug("nf_ct_h323: H.245 signal %d\n", mscm
->choice
);
562 /****************************************************************************/
563 static int h245_help(struct sk_buff
*skb
, unsigned int protoff
,
564 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
566 static MultimediaSystemControlMessage mscm
;
567 unsigned char *data
= NULL
;
572 /* Until there's been traffic both ways, don't look in packets. */
573 if (ctinfo
!= IP_CT_ESTABLISHED
&& ctinfo
!= IP_CT_ESTABLISHED_REPLY
)
576 pr_debug("nf_ct_h245: skblen = %u\n", skb
->len
);
578 spin_lock_bh(&nf_h323_lock
);
580 /* Process each TPKT */
581 while (get_tpkt_data(skb
, protoff
, ct
, ctinfo
,
582 &data
, &datalen
, &dataoff
)) {
583 pr_debug("nf_ct_h245: TPKT len=%d ", datalen
);
584 nf_ct_dump_tuple(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
586 /* Decode H.245 signal */
587 ret
= DecodeMultimediaSystemControlMessage(data
, datalen
,
590 pr_debug("nf_ct_h245: decoding error: %s\n",
591 ret
== H323_ERROR_BOUND
?
592 "out of bound" : "out of range");
593 /* We don't drop when decoding error */
597 /* Process H.245 signal */
598 if (process_h245(skb
, ct
, ctinfo
, &data
, dataoff
, &mscm
) < 0)
602 spin_unlock_bh(&nf_h323_lock
);
606 spin_unlock_bh(&nf_h323_lock
);
607 net_info_ratelimited("nf_ct_h245: packet dropped\n");
611 /****************************************************************************/
612 static const struct nf_conntrack_expect_policy h245_exp_policy
= {
613 .max_expected
= H323_RTP_CHANNEL_MAX
* 4 + 2 /* T.120 */,
617 static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly
= {
620 .data_len
= sizeof(struct nf_ct_h323_master
),
621 .tuple
.src
.l3num
= AF_UNSPEC
,
622 .tuple
.dst
.protonum
= IPPROTO_UDP
,
624 .expect_policy
= &h245_exp_policy
,
627 /****************************************************************************/
628 int get_h225_addr(struct nf_conn
*ct
, unsigned char *data
,
629 TransportAddress
*taddr
,
630 union nf_inet_addr
*addr
, __be16
*port
)
632 const unsigned char *p
;
635 switch (taddr
->choice
) {
636 case eTransportAddress_ipAddress
:
637 if (nf_ct_l3num(ct
) != AF_INET
)
639 p
= data
+ taddr
->ipAddress
.ip
;
642 case eTransportAddress_ip6Address
:
643 if (nf_ct_l3num(ct
) != AF_INET6
)
645 p
= data
+ taddr
->ip6Address
.ip
;
652 memcpy(addr
, p
, len
);
653 memset((void *)addr
+ len
, 0, sizeof(*addr
) - len
);
654 memcpy(port
, p
+ len
, sizeof(__be16
));
659 /****************************************************************************/
660 static int expect_h245(struct sk_buff
*skb
, struct nf_conn
*ct
,
661 enum ip_conntrack_info ctinfo
,
662 unsigned char **data
, int dataoff
,
663 TransportAddress
*taddr
)
665 int dir
= CTINFO2DIR(ctinfo
);
668 union nf_inet_addr addr
;
669 struct nf_conntrack_expect
*exp
;
670 typeof(nat_h245_hook
) nat_h245
;
672 /* Read h245Address */
673 if (!get_h225_addr(ct
, *data
, taddr
, &addr
, &port
) ||
674 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) ||
678 /* Create expect for h245 connection */
679 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
681 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
682 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
683 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
684 IPPROTO_TCP
, NULL
, &port
);
685 exp
->helper
= &nf_conntrack_helper_h245
;
687 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
688 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
689 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
690 (nat_h245
= rcu_dereference(nat_h245_hook
)) &&
691 ct
->status
& IPS_NAT_MASK
) {
693 ret
= nat_h245(skb
, ct
, ctinfo
, data
, dataoff
, taddr
,
695 } else { /* Conntrack only */
696 if (nf_ct_expect_related(exp
) == 0) {
697 pr_debug("nf_ct_q931: expect H.245 ");
698 nf_ct_dump_tuple(&exp
->tuple
);
703 nf_ct_expect_put(exp
);
708 /* If the calling party is on the same side of the forward-to party,
709 * we don't need to track the second call */
710 static int callforward_do_filter(const union nf_inet_addr
*src
,
711 const union nf_inet_addr
*dst
,
714 const struct nf_afinfo
*afinfo
;
717 /* rcu_read_lock()ed by nf_hook_slow() */
718 afinfo
= nf_get_afinfo(family
);
724 struct flowi4 fl1
, fl2
;
725 struct rtable
*rt1
, *rt2
;
727 memset(&fl1
, 0, sizeof(fl1
));
730 memset(&fl2
, 0, sizeof(fl2
));
732 if (!afinfo
->route(&init_net
, (struct dst_entry
**)&rt1
,
733 flowi4_to_flowi(&fl1
), false)) {
734 if (!afinfo
->route(&init_net
, (struct dst_entry
**)&rt2
,
735 flowi4_to_flowi(&fl2
), false)) {
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 IS_ENABLED(CONFIG_NF_CONNTRACK_IPV6)
747 struct flowi6 fl1
, fl2
;
748 struct rt6_info
*rt1
, *rt2
;
750 memset(&fl1
, 0, sizeof(fl1
));
751 fl1
.daddr
= src
->in6
;
753 memset(&fl2
, 0, sizeof(fl2
));
754 fl2
.daddr
= dst
->in6
;
755 if (!afinfo
->route(&init_net
, (struct dst_entry
**)&rt1
,
756 flowi6_to_flowi(&fl1
), false)) {
757 if (!afinfo
->route(&init_net
, (struct dst_entry
**)&rt2
,
758 flowi6_to_flowi(&fl2
), false)) {
759 if (!memcmp(&rt1
->rt6i_gateway
, &rt2
->rt6i_gateway
,
760 sizeof(rt1
->rt6i_gateway
)) &&
761 rt1
->dst
.dev
== rt2
->dst
.dev
)
763 dst_release(&rt2
->dst
);
765 dst_release(&rt1
->dst
);
775 /****************************************************************************/
776 static int expect_callforwarding(struct sk_buff
*skb
,
778 enum ip_conntrack_info ctinfo
,
779 unsigned char **data
, int dataoff
,
780 TransportAddress
*taddr
)
782 int dir
= CTINFO2DIR(ctinfo
);
785 union nf_inet_addr addr
;
786 struct nf_conntrack_expect
*exp
;
787 typeof(nat_callforwarding_hook
) nat_callforwarding
;
789 /* Read alternativeAddress */
790 if (!get_h225_addr(ct
, *data
, taddr
, &addr
, &port
) || port
== 0)
793 /* If the calling party is on the same side of the forward-to party,
794 * we don't need to track the second call */
795 if (callforward_filter
&&
796 callforward_do_filter(&addr
, &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
798 pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
802 /* Create expect for the second call leg */
803 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
805 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
806 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
807 IPPROTO_TCP
, NULL
, &port
);
808 exp
->helper
= nf_conntrack_helper_q931
;
810 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
811 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
812 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
813 (nat_callforwarding
= rcu_dereference(nat_callforwarding_hook
)) &&
814 ct
->status
& IPS_NAT_MASK
) {
816 ret
= nat_callforwarding(skb
, ct
, ctinfo
, data
, dataoff
,
818 } else { /* Conntrack only */
819 if (nf_ct_expect_related(exp
) == 0) {
820 pr_debug("nf_ct_q931: expect Call Forwarding ");
821 nf_ct_dump_tuple(&exp
->tuple
);
826 nf_ct_expect_put(exp
);
831 /****************************************************************************/
832 static int process_setup(struct sk_buff
*skb
, struct nf_conn
*ct
,
833 enum ip_conntrack_info ctinfo
,
834 unsigned char **data
, int dataoff
,
837 int dir
= CTINFO2DIR(ctinfo
);
841 union nf_inet_addr addr
;
842 typeof(set_h225_addr_hook
) set_h225_addr
;
844 pr_debug("nf_ct_q931: Setup\n");
846 if (setup
->options
& eSetup_UUIE_h245Address
) {
847 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
848 &setup
->h245Address
);
853 set_h225_addr
= rcu_dereference(set_h225_addr_hook
);
854 if ((setup
->options
& eSetup_UUIE_destCallSignalAddress
) &&
855 (set_h225_addr
) && ct
->status
& IPS_NAT_MASK
&&
856 get_h225_addr(ct
, *data
, &setup
->destCallSignalAddress
,
858 memcmp(&addr
, &ct
->tuplehash
[!dir
].tuple
.src
.u3
, sizeof(addr
))) {
859 pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n",
860 &addr
, ntohs(port
), &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
861 ntohs(ct
->tuplehash
[!dir
].tuple
.src
.u
.tcp
.port
));
862 ret
= set_h225_addr(skb
, data
, dataoff
,
863 &setup
->destCallSignalAddress
,
864 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
865 ct
->tuplehash
[!dir
].tuple
.src
.u
.tcp
.port
);
870 if ((setup
->options
& eSetup_UUIE_sourceCallSignalAddress
) &&
871 (set_h225_addr
) && ct
->status
& IPS_NAT_MASK
&&
872 get_h225_addr(ct
, *data
, &setup
->sourceCallSignalAddress
,
874 memcmp(&addr
, &ct
->tuplehash
[!dir
].tuple
.dst
.u3
, sizeof(addr
))) {
875 pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n",
876 &addr
, ntohs(port
), &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
877 ntohs(ct
->tuplehash
[!dir
].tuple
.dst
.u
.tcp
.port
));
878 ret
= set_h225_addr(skb
, data
, dataoff
,
879 &setup
->sourceCallSignalAddress
,
880 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
881 ct
->tuplehash
[!dir
].tuple
.dst
.u
.tcp
.port
);
886 if (setup
->options
& eSetup_UUIE_fastStart
) {
887 for (i
= 0; i
< setup
->fastStart
.count
; i
++) {
888 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
889 &setup
->fastStart
.item
[i
]);
898 /****************************************************************************/
899 static int process_callproceeding(struct sk_buff
*skb
,
901 enum ip_conntrack_info ctinfo
,
902 unsigned char **data
, int dataoff
,
903 CallProceeding_UUIE
*callproc
)
908 pr_debug("nf_ct_q931: CallProceeding\n");
910 if (callproc
->options
& eCallProceeding_UUIE_h245Address
) {
911 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
912 &callproc
->h245Address
);
917 if (callproc
->options
& eCallProceeding_UUIE_fastStart
) {
918 for (i
= 0; i
< callproc
->fastStart
.count
; i
++) {
919 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
920 &callproc
->fastStart
.item
[i
]);
929 /****************************************************************************/
930 static int process_connect(struct sk_buff
*skb
, struct nf_conn
*ct
,
931 enum ip_conntrack_info ctinfo
,
932 unsigned char **data
, int dataoff
,
933 Connect_UUIE
*connect
)
938 pr_debug("nf_ct_q931: Connect\n");
940 if (connect
->options
& eConnect_UUIE_h245Address
) {
941 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
942 &connect
->h245Address
);
947 if (connect
->options
& eConnect_UUIE_fastStart
) {
948 for (i
= 0; i
< connect
->fastStart
.count
; i
++) {
949 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
950 &connect
->fastStart
.item
[i
]);
959 /****************************************************************************/
960 static int process_alerting(struct sk_buff
*skb
, struct nf_conn
*ct
,
961 enum ip_conntrack_info ctinfo
,
962 unsigned char **data
, int dataoff
,
963 Alerting_UUIE
*alert
)
968 pr_debug("nf_ct_q931: Alerting\n");
970 if (alert
->options
& eAlerting_UUIE_h245Address
) {
971 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
972 &alert
->h245Address
);
977 if (alert
->options
& eAlerting_UUIE_fastStart
) {
978 for (i
= 0; i
< alert
->fastStart
.count
; i
++) {
979 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
980 &alert
->fastStart
.item
[i
]);
989 /****************************************************************************/
990 static int process_facility(struct sk_buff
*skb
, struct nf_conn
*ct
,
991 enum ip_conntrack_info ctinfo
,
992 unsigned char **data
, int dataoff
,
993 Facility_UUIE
*facility
)
998 pr_debug("nf_ct_q931: Facility\n");
1000 if (facility
->reason
.choice
== eFacilityReason_callForwarded
) {
1001 if (facility
->options
& eFacility_UUIE_alternativeAddress
)
1002 return expect_callforwarding(skb
, ct
, ctinfo
, data
,
1005 alternativeAddress
);
1009 if (facility
->options
& eFacility_UUIE_h245Address
) {
1010 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
1011 &facility
->h245Address
);
1016 if (facility
->options
& eFacility_UUIE_fastStart
) {
1017 for (i
= 0; i
< facility
->fastStart
.count
; i
++) {
1018 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
1019 &facility
->fastStart
.item
[i
]);
1028 /****************************************************************************/
1029 static int process_progress(struct sk_buff
*skb
, struct nf_conn
*ct
,
1030 enum ip_conntrack_info ctinfo
,
1031 unsigned char **data
, int dataoff
,
1032 Progress_UUIE
*progress
)
1037 pr_debug("nf_ct_q931: Progress\n");
1039 if (progress
->options
& eProgress_UUIE_h245Address
) {
1040 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
1041 &progress
->h245Address
);
1046 if (progress
->options
& eProgress_UUIE_fastStart
) {
1047 for (i
= 0; i
< progress
->fastStart
.count
; i
++) {
1048 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
1049 &progress
->fastStart
.item
[i
]);
1058 /****************************************************************************/
1059 static int process_q931(struct sk_buff
*skb
, struct nf_conn
*ct
,
1060 enum ip_conntrack_info ctinfo
,
1061 unsigned char **data
, int dataoff
, Q931
*q931
)
1063 H323_UU_PDU
*pdu
= &q931
->UUIE
.h323_uu_pdu
;
1067 switch (pdu
->h323_message_body
.choice
) {
1068 case eH323_UU_PDU_h323_message_body_setup
:
1069 ret
= process_setup(skb
, ct
, ctinfo
, data
, dataoff
,
1070 &pdu
->h323_message_body
.setup
);
1072 case eH323_UU_PDU_h323_message_body_callProceeding
:
1073 ret
= process_callproceeding(skb
, ct
, ctinfo
, data
, dataoff
,
1074 &pdu
->h323_message_body
.
1077 case eH323_UU_PDU_h323_message_body_connect
:
1078 ret
= process_connect(skb
, ct
, ctinfo
, data
, dataoff
,
1079 &pdu
->h323_message_body
.connect
);
1081 case eH323_UU_PDU_h323_message_body_alerting
:
1082 ret
= process_alerting(skb
, ct
, ctinfo
, data
, dataoff
,
1083 &pdu
->h323_message_body
.alerting
);
1085 case eH323_UU_PDU_h323_message_body_facility
:
1086 ret
= process_facility(skb
, ct
, ctinfo
, data
, dataoff
,
1087 &pdu
->h323_message_body
.facility
);
1089 case eH323_UU_PDU_h323_message_body_progress
:
1090 ret
= process_progress(skb
, ct
, ctinfo
, data
, dataoff
,
1091 &pdu
->h323_message_body
.progress
);
1094 pr_debug("nf_ct_q931: Q.931 signal %d\n",
1095 pdu
->h323_message_body
.choice
);
1102 if (pdu
->options
& eH323_UU_PDU_h245Control
) {
1103 for (i
= 0; i
< pdu
->h245Control
.count
; i
++) {
1104 ret
= process_h245(skb
, ct
, ctinfo
, data
, dataoff
,
1105 &pdu
->h245Control
.item
[i
]);
1114 /****************************************************************************/
1115 static int q931_help(struct sk_buff
*skb
, unsigned int protoff
,
1116 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
1119 unsigned char *data
= NULL
;
1124 /* Until there's been traffic both ways, don't look in packets. */
1125 if (ctinfo
!= IP_CT_ESTABLISHED
&& ctinfo
!= IP_CT_ESTABLISHED_REPLY
)
1128 pr_debug("nf_ct_q931: skblen = %u\n", skb
->len
);
1130 spin_lock_bh(&nf_h323_lock
);
1132 /* Process each TPKT */
1133 while (get_tpkt_data(skb
, protoff
, ct
, ctinfo
,
1134 &data
, &datalen
, &dataoff
)) {
1135 pr_debug("nf_ct_q931: TPKT len=%d ", datalen
);
1136 nf_ct_dump_tuple(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
1138 /* Decode Q.931 signal */
1139 ret
= DecodeQ931(data
, datalen
, &q931
);
1141 pr_debug("nf_ct_q931: decoding error: %s\n",
1142 ret
== H323_ERROR_BOUND
?
1143 "out of bound" : "out of range");
1144 /* We don't drop when decoding error */
1148 /* Process Q.931 signal */
1149 if (process_q931(skb
, ct
, ctinfo
, &data
, dataoff
, &q931
) < 0)
1153 spin_unlock_bh(&nf_h323_lock
);
1157 spin_unlock_bh(&nf_h323_lock
);
1158 net_info_ratelimited("nf_ct_q931: packet dropped\n");
1162 /****************************************************************************/
1163 static const struct nf_conntrack_expect_policy q931_exp_policy
= {
1164 /* T.120 and H.245 */
1165 .max_expected
= H323_RTP_CHANNEL_MAX
* 4 + 4,
1169 static struct nf_conntrack_helper nf_conntrack_helper_q931
[] __read_mostly
= {
1173 .data_len
= sizeof(struct nf_ct_h323_master
),
1174 .tuple
.src
.l3num
= AF_INET
,
1175 .tuple
.src
.u
.tcp
.port
= cpu_to_be16(Q931_PORT
),
1176 .tuple
.dst
.protonum
= IPPROTO_TCP
,
1178 .expect_policy
= &q931_exp_policy
,
1183 .tuple
.src
.l3num
= AF_INET6
,
1184 .tuple
.src
.u
.tcp
.port
= cpu_to_be16(Q931_PORT
),
1185 .tuple
.dst
.protonum
= IPPROTO_TCP
,
1187 .expect_policy
= &q931_exp_policy
,
1191 /****************************************************************************/
1192 static unsigned char *get_udp_data(struct sk_buff
*skb
, unsigned int protoff
,
1195 const struct udphdr
*uh
;
1199 uh
= skb_header_pointer(skb
, protoff
, sizeof(_uh
), &_uh
);
1202 dataoff
= protoff
+ sizeof(_uh
);
1203 if (dataoff
>= skb
->len
)
1205 *datalen
= skb
->len
- dataoff
;
1206 return skb_header_pointer(skb
, dataoff
, *datalen
, h323_buffer
);
1209 /****************************************************************************/
1210 static struct nf_conntrack_expect
*find_expect(struct nf_conn
*ct
,
1211 union nf_inet_addr
*addr
,
1214 struct net
*net
= nf_ct_net(ct
);
1215 struct nf_conntrack_expect
*exp
;
1216 struct nf_conntrack_tuple tuple
;
1218 memset(&tuple
.src
.u3
, 0, sizeof(tuple
.src
.u3
));
1219 tuple
.src
.u
.tcp
.port
= 0;
1220 memcpy(&tuple
.dst
.u3
, addr
, sizeof(tuple
.dst
.u3
));
1221 tuple
.dst
.u
.tcp
.port
= port
;
1222 tuple
.dst
.protonum
= IPPROTO_TCP
;
1224 exp
= __nf_ct_expect_find(net
, nf_ct_zone(ct
), &tuple
);
1225 if (exp
&& exp
->master
== ct
)
1230 /****************************************************************************/
1231 static int set_expect_timeout(struct nf_conntrack_expect
*exp
,
1232 unsigned int timeout
)
1234 if (!exp
|| !del_timer(&exp
->timeout
))
1237 exp
->timeout
.expires
= jiffies
+ timeout
* HZ
;
1238 add_timer(&exp
->timeout
);
1243 /****************************************************************************/
1244 static int expect_q931(struct sk_buff
*skb
, struct nf_conn
*ct
,
1245 enum ip_conntrack_info ctinfo
,
1246 unsigned char **data
,
1247 TransportAddress
*taddr
, int count
)
1249 struct nf_ct_h323_master
*info
= nfct_help_data(ct
);
1250 int dir
= CTINFO2DIR(ctinfo
);
1254 union nf_inet_addr addr
;
1255 struct nf_conntrack_expect
*exp
;
1256 typeof(nat_q931_hook
) nat_q931
;
1258 /* Look for the first related address */
1259 for (i
= 0; i
< count
; i
++) {
1260 if (get_h225_addr(ct
, *data
, &taddr
[i
], &addr
, &port
) &&
1261 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
,
1262 sizeof(addr
)) == 0 && port
!= 0)
1266 if (i
>= count
) /* Not found */
1269 /* Create expect for Q.931 */
1270 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1272 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1273 gkrouted_only
? /* only accept calls from GK? */
1274 &ct
->tuplehash
[!dir
].tuple
.src
.u3
: NULL
,
1275 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1276 IPPROTO_TCP
, NULL
, &port
);
1277 exp
->helper
= nf_conntrack_helper_q931
;
1278 exp
->flags
= NF_CT_EXPECT_PERMANENT
; /* Accept multiple calls */
1280 nat_q931
= rcu_dereference(nat_q931_hook
);
1281 if (nat_q931
&& ct
->status
& IPS_NAT_MASK
) { /* Need NAT */
1282 ret
= nat_q931(skb
, ct
, ctinfo
, data
, taddr
, i
, port
, exp
);
1283 } else { /* Conntrack only */
1284 if (nf_ct_expect_related(exp
) == 0) {
1285 pr_debug("nf_ct_ras: expect Q.931 ");
1286 nf_ct_dump_tuple(&exp
->tuple
);
1288 /* Save port for looking up expect in processing RCF */
1289 info
->sig_port
[dir
] = port
;
1294 nf_ct_expect_put(exp
);
1299 /****************************************************************************/
1300 static int process_grq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1301 enum ip_conntrack_info ctinfo
,
1302 unsigned char **data
, GatekeeperRequest
*grq
)
1304 typeof(set_ras_addr_hook
) set_ras_addr
;
1306 pr_debug("nf_ct_ras: GRQ\n");
1308 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1309 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) /* NATed */
1310 return set_ras_addr(skb
, ct
, ctinfo
, data
,
1311 &grq
->rasAddress
, 1);
1315 /****************************************************************************/
1316 static int process_gcf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1317 enum ip_conntrack_info ctinfo
,
1318 unsigned char **data
, GatekeeperConfirm
*gcf
)
1320 int dir
= CTINFO2DIR(ctinfo
);
1323 union nf_inet_addr addr
;
1324 struct nf_conntrack_expect
*exp
;
1326 pr_debug("nf_ct_ras: GCF\n");
1328 if (!get_h225_addr(ct
, *data
, &gcf
->rasAddress
, &addr
, &port
))
1331 /* Registration port is the same as discovery port */
1332 if (!memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1333 port
== ct
->tuplehash
[dir
].tuple
.src
.u
.udp
.port
)
1336 /* Avoid RAS expectation loops. A GCF is never expected. */
1337 if (test_bit(IPS_EXPECTED_BIT
, &ct
->status
))
1340 /* Need new expect */
1341 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1343 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1344 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1345 IPPROTO_UDP
, NULL
, &port
);
1346 exp
->helper
= nf_conntrack_helper_ras
;
1348 if (nf_ct_expect_related(exp
) == 0) {
1349 pr_debug("nf_ct_ras: expect RAS ");
1350 nf_ct_dump_tuple(&exp
->tuple
);
1354 nf_ct_expect_put(exp
);
1359 /****************************************************************************/
1360 static int process_rrq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1361 enum ip_conntrack_info ctinfo
,
1362 unsigned char **data
, RegistrationRequest
*rrq
)
1364 struct nf_ct_h323_master
*info
= nfct_help_data(ct
);
1366 typeof(set_ras_addr_hook
) set_ras_addr
;
1368 pr_debug("nf_ct_ras: RRQ\n");
1370 ret
= expect_q931(skb
, ct
, ctinfo
, data
,
1371 rrq
->callSignalAddress
.item
,
1372 rrq
->callSignalAddress
.count
);
1376 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1377 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) {
1378 ret
= set_ras_addr(skb
, ct
, ctinfo
, data
,
1379 rrq
->rasAddress
.item
,
1380 rrq
->rasAddress
.count
);
1385 if (rrq
->options
& eRegistrationRequest_timeToLive
) {
1386 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq
->timeToLive
);
1387 info
->timeout
= rrq
->timeToLive
;
1389 info
->timeout
= default_rrq_ttl
;
1394 /****************************************************************************/
1395 static int process_rcf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1396 enum ip_conntrack_info ctinfo
,
1397 unsigned char **data
, RegistrationConfirm
*rcf
)
1399 struct nf_ct_h323_master
*info
= nfct_help_data(ct
);
1400 int dir
= CTINFO2DIR(ctinfo
);
1402 struct nf_conntrack_expect
*exp
;
1403 typeof(set_sig_addr_hook
) set_sig_addr
;
1405 pr_debug("nf_ct_ras: RCF\n");
1407 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1408 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1409 ret
= set_sig_addr(skb
, ct
, ctinfo
, data
,
1410 rcf
->callSignalAddress
.item
,
1411 rcf
->callSignalAddress
.count
);
1416 if (rcf
->options
& eRegistrationConfirm_timeToLive
) {
1417 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf
->timeToLive
);
1418 info
->timeout
= rcf
->timeToLive
;
1421 if (info
->timeout
> 0) {
1422 pr_debug("nf_ct_ras: set RAS connection timeout to "
1423 "%u seconds\n", info
->timeout
);
1424 nf_ct_refresh(ct
, skb
, info
->timeout
* HZ
);
1426 /* Set expect timeout */
1427 spin_lock_bh(&nf_conntrack_lock
);
1428 exp
= find_expect(ct
, &ct
->tuplehash
[dir
].tuple
.dst
.u3
,
1429 info
->sig_port
[!dir
]);
1431 pr_debug("nf_ct_ras: set Q.931 expect "
1432 "timeout to %u seconds for",
1434 nf_ct_dump_tuple(&exp
->tuple
);
1435 set_expect_timeout(exp
, info
->timeout
);
1437 spin_unlock_bh(&nf_conntrack_lock
);
1443 /****************************************************************************/
1444 static int process_urq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1445 enum ip_conntrack_info ctinfo
,
1446 unsigned char **data
, UnregistrationRequest
*urq
)
1448 struct nf_ct_h323_master
*info
= nfct_help_data(ct
);
1449 int dir
= CTINFO2DIR(ctinfo
);
1451 typeof(set_sig_addr_hook
) set_sig_addr
;
1453 pr_debug("nf_ct_ras: URQ\n");
1455 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1456 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1457 ret
= set_sig_addr(skb
, ct
, ctinfo
, data
,
1458 urq
->callSignalAddress
.item
,
1459 urq
->callSignalAddress
.count
);
1464 /* Clear old expect */
1465 nf_ct_remove_expectations(ct
);
1466 info
->sig_port
[dir
] = 0;
1467 info
->sig_port
[!dir
] = 0;
1469 /* Give it 30 seconds for UCF or URJ */
1470 nf_ct_refresh(ct
, skb
, 30 * HZ
);
1475 /****************************************************************************/
1476 static int process_arq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1477 enum ip_conntrack_info ctinfo
,
1478 unsigned char **data
, AdmissionRequest
*arq
)
1480 const struct nf_ct_h323_master
*info
= nfct_help_data(ct
);
1481 int dir
= CTINFO2DIR(ctinfo
);
1483 union nf_inet_addr addr
;
1484 typeof(set_h225_addr_hook
) set_h225_addr
;
1486 pr_debug("nf_ct_ras: ARQ\n");
1488 set_h225_addr
= rcu_dereference(set_h225_addr_hook
);
1489 if ((arq
->options
& eAdmissionRequest_destCallSignalAddress
) &&
1490 get_h225_addr(ct
, *data
, &arq
->destCallSignalAddress
,
1492 !memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1493 port
== info
->sig_port
[dir
] &&
1494 set_h225_addr
&& ct
->status
& IPS_NAT_MASK
) {
1496 return set_h225_addr(skb
, data
, 0,
1497 &arq
->destCallSignalAddress
,
1498 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1499 info
->sig_port
[!dir
]);
1502 if ((arq
->options
& eAdmissionRequest_srcCallSignalAddress
) &&
1503 get_h225_addr(ct
, *data
, &arq
->srcCallSignalAddress
,
1505 !memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1506 set_h225_addr
&& ct
->status
& IPS_NAT_MASK
) {
1508 return set_h225_addr(skb
, data
, 0,
1509 &arq
->srcCallSignalAddress
,
1510 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1517 /****************************************************************************/
1518 static int process_acf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1519 enum ip_conntrack_info ctinfo
,
1520 unsigned char **data
, AdmissionConfirm
*acf
)
1522 int dir
= CTINFO2DIR(ctinfo
);
1525 union nf_inet_addr addr
;
1526 struct nf_conntrack_expect
*exp
;
1527 typeof(set_sig_addr_hook
) set_sig_addr
;
1529 pr_debug("nf_ct_ras: ACF\n");
1531 if (!get_h225_addr(ct
, *data
, &acf
->destCallSignalAddress
,
1535 if (!memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.dst
.u3
, sizeof(addr
))) {
1537 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1538 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
)
1539 return set_sig_addr(skb
, ct
, ctinfo
, data
,
1540 &acf
->destCallSignalAddress
, 1);
1544 /* Need new expect */
1545 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1547 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1548 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1549 IPPROTO_TCP
, NULL
, &port
);
1550 exp
->flags
= NF_CT_EXPECT_PERMANENT
;
1551 exp
->helper
= nf_conntrack_helper_q931
;
1553 if (nf_ct_expect_related(exp
) == 0) {
1554 pr_debug("nf_ct_ras: expect Q.931 ");
1555 nf_ct_dump_tuple(&exp
->tuple
);
1559 nf_ct_expect_put(exp
);
1564 /****************************************************************************/
1565 static int process_lrq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1566 enum ip_conntrack_info ctinfo
,
1567 unsigned char **data
, LocationRequest
*lrq
)
1569 typeof(set_ras_addr_hook
) set_ras_addr
;
1571 pr_debug("nf_ct_ras: LRQ\n");
1573 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1574 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
)
1575 return set_ras_addr(skb
, ct
, ctinfo
, data
,
1576 &lrq
->replyAddress
, 1);
1580 /****************************************************************************/
1581 static int process_lcf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1582 enum ip_conntrack_info ctinfo
,
1583 unsigned char **data
, LocationConfirm
*lcf
)
1585 int dir
= CTINFO2DIR(ctinfo
);
1588 union nf_inet_addr addr
;
1589 struct nf_conntrack_expect
*exp
;
1591 pr_debug("nf_ct_ras: LCF\n");
1593 if (!get_h225_addr(ct
, *data
, &lcf
->callSignalAddress
,
1597 /* Need new expect for call signal */
1598 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1600 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1601 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1602 IPPROTO_TCP
, NULL
, &port
);
1603 exp
->flags
= NF_CT_EXPECT_PERMANENT
;
1604 exp
->helper
= nf_conntrack_helper_q931
;
1606 if (nf_ct_expect_related(exp
) == 0) {
1607 pr_debug("nf_ct_ras: expect Q.931 ");
1608 nf_ct_dump_tuple(&exp
->tuple
);
1612 nf_ct_expect_put(exp
);
1614 /* Ignore rasAddress */
1619 /****************************************************************************/
1620 static int process_irr(struct sk_buff
*skb
, struct nf_conn
*ct
,
1621 enum ip_conntrack_info ctinfo
,
1622 unsigned char **data
, InfoRequestResponse
*irr
)
1625 typeof(set_ras_addr_hook
) set_ras_addr
;
1626 typeof(set_sig_addr_hook
) set_sig_addr
;
1628 pr_debug("nf_ct_ras: IRR\n");
1630 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1631 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) {
1632 ret
= set_ras_addr(skb
, ct
, ctinfo
, data
,
1633 &irr
->rasAddress
, 1);
1638 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1639 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1640 ret
= set_sig_addr(skb
, ct
, ctinfo
, data
,
1641 irr
->callSignalAddress
.item
,
1642 irr
->callSignalAddress
.count
);
1650 /****************************************************************************/
1651 static int process_ras(struct sk_buff
*skb
, struct nf_conn
*ct
,
1652 enum ip_conntrack_info ctinfo
,
1653 unsigned char **data
, RasMessage
*ras
)
1655 switch (ras
->choice
) {
1656 case eRasMessage_gatekeeperRequest
:
1657 return process_grq(skb
, ct
, ctinfo
, data
,
1658 &ras
->gatekeeperRequest
);
1659 case eRasMessage_gatekeeperConfirm
:
1660 return process_gcf(skb
, ct
, ctinfo
, data
,
1661 &ras
->gatekeeperConfirm
);
1662 case eRasMessage_registrationRequest
:
1663 return process_rrq(skb
, ct
, ctinfo
, data
,
1664 &ras
->registrationRequest
);
1665 case eRasMessage_registrationConfirm
:
1666 return process_rcf(skb
, ct
, ctinfo
, data
,
1667 &ras
->registrationConfirm
);
1668 case eRasMessage_unregistrationRequest
:
1669 return process_urq(skb
, ct
, ctinfo
, data
,
1670 &ras
->unregistrationRequest
);
1671 case eRasMessage_admissionRequest
:
1672 return process_arq(skb
, ct
, ctinfo
, data
,
1673 &ras
->admissionRequest
);
1674 case eRasMessage_admissionConfirm
:
1675 return process_acf(skb
, ct
, ctinfo
, data
,
1676 &ras
->admissionConfirm
);
1677 case eRasMessage_locationRequest
:
1678 return process_lrq(skb
, ct
, ctinfo
, data
,
1679 &ras
->locationRequest
);
1680 case eRasMessage_locationConfirm
:
1681 return process_lcf(skb
, ct
, ctinfo
, data
,
1682 &ras
->locationConfirm
);
1683 case eRasMessage_infoRequestResponse
:
1684 return process_irr(skb
, ct
, ctinfo
, data
,
1685 &ras
->infoRequestResponse
);
1687 pr_debug("nf_ct_ras: RAS message %d\n", ras
->choice
);
1694 /****************************************************************************/
1695 static int ras_help(struct sk_buff
*skb
, unsigned int protoff
,
1696 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
1698 static RasMessage ras
;
1699 unsigned char *data
;
1703 pr_debug("nf_ct_ras: skblen = %u\n", skb
->len
);
1705 spin_lock_bh(&nf_h323_lock
);
1708 data
= get_udp_data(skb
, protoff
, &datalen
);
1711 pr_debug("nf_ct_ras: RAS message len=%d ", datalen
);
1712 nf_ct_dump_tuple(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
1714 /* Decode RAS message */
1715 ret
= DecodeRasMessage(data
, datalen
, &ras
);
1717 pr_debug("nf_ct_ras: decoding error: %s\n",
1718 ret
== H323_ERROR_BOUND
?
1719 "out of bound" : "out of range");
1723 /* Process RAS message */
1724 if (process_ras(skb
, ct
, ctinfo
, &data
, &ras
) < 0)
1728 spin_unlock_bh(&nf_h323_lock
);
1732 spin_unlock_bh(&nf_h323_lock
);
1733 net_info_ratelimited("nf_ct_ras: packet dropped\n");
1737 /****************************************************************************/
1738 static const struct nf_conntrack_expect_policy ras_exp_policy
= {
1743 static struct nf_conntrack_helper nf_conntrack_helper_ras
[] __read_mostly
= {
1747 .data_len
= sizeof(struct nf_ct_h323_master
),
1748 .tuple
.src
.l3num
= AF_INET
,
1749 .tuple
.src
.u
.udp
.port
= cpu_to_be16(RAS_PORT
),
1750 .tuple
.dst
.protonum
= IPPROTO_UDP
,
1752 .expect_policy
= &ras_exp_policy
,
1757 .data_len
= sizeof(struct nf_ct_h323_master
),
1758 .tuple
.src
.l3num
= AF_INET6
,
1759 .tuple
.src
.u
.udp
.port
= cpu_to_be16(RAS_PORT
),
1760 .tuple
.dst
.protonum
= IPPROTO_UDP
,
1762 .expect_policy
= &ras_exp_policy
,
1766 /****************************************************************************/
1767 static void __exit
nf_conntrack_h323_fini(void)
1769 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[1]);
1770 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[0]);
1771 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[1]);
1772 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[0]);
1773 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245
);
1775 pr_debug("nf_ct_h323: fini\n");
1778 /****************************************************************************/
1779 static int __init
nf_conntrack_h323_init(void)
1783 h323_buffer
= kmalloc(65536, GFP_KERNEL
);
1786 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_h245
);
1789 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_q931
[0]);
1792 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_q931
[1]);
1795 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_ras
[0]);
1798 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_ras
[1]);
1801 pr_debug("nf_ct_h323: init success\n");
1805 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[0]);
1807 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[1]);
1809 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[0]);
1811 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245
);
1817 /****************************************************************************/
1818 module_init(nf_conntrack_h323_init
);
1819 module_exit(nf_conntrack_h323_fini
);
1821 EXPORT_SYMBOL_GPL(get_h225_addr
);
1822 EXPORT_SYMBOL_GPL(set_h245_addr_hook
);
1823 EXPORT_SYMBOL_GPL(set_h225_addr_hook
);
1824 EXPORT_SYMBOL_GPL(set_sig_addr_hook
);
1825 EXPORT_SYMBOL_GPL(set_ras_addr_hook
);
1826 EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook
);
1827 EXPORT_SYMBOL_GPL(nat_t120_hook
);
1828 EXPORT_SYMBOL_GPL(nat_h245_hook
);
1829 EXPORT_SYMBOL_GPL(nat_callforwarding_hook
);
1830 EXPORT_SYMBOL_GPL(nat_q931_hook
);
1832 MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1833 MODULE_DESCRIPTION("H.323 connection tracking helper");
1834 MODULE_LICENSE("GPL");
1835 MODULE_ALIAS("ip_conntrack_h323");
1836 MODULE_ALIAS_NFCT_HELPER("RAS");
1837 MODULE_ALIAS_NFCT_HELPER("Q.931");
1838 MODULE_ALIAS_NFCT_HELPER("H.245");