2 * H.323 connection tracking helper
4 * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net>
6 * This source code is licensed under General Public License version 2.
8 * Based on the 'brute force' H.323 connection tracking module by
9 * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
11 * For more information, please see http://nath323.sourceforge.net/
14 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/ctype.h>
17 #include <linux/inet.h>
20 #include <linux/slab.h>
21 #include <linux/udp.h>
22 #include <linux/tcp.h>
23 #include <linux/skbuff.h>
24 #include <net/route.h>
25 #include <net/ip6_route.h>
27 #include <net/netfilter/nf_conntrack.h>
28 #include <net/netfilter/nf_conntrack_core.h>
29 #include <net/netfilter/nf_conntrack_tuple.h>
30 #include <net/netfilter/nf_conntrack_expect.h>
31 #include <net/netfilter/nf_conntrack_ecache.h>
32 #include <net/netfilter/nf_conntrack_helper.h>
33 #include <net/netfilter/nf_conntrack_zones.h>
34 #include <linux/netfilter/nf_conntrack_h323.h>
37 static unsigned int default_rrq_ttl __read_mostly
= 300;
38 module_param(default_rrq_ttl
, uint
, 0600);
39 MODULE_PARM_DESC(default_rrq_ttl
, "use this TTL if it's missing in RRQ");
41 static int gkrouted_only __read_mostly
= 1;
42 module_param(gkrouted_only
, int, 0600);
43 MODULE_PARM_DESC(gkrouted_only
, "only accept calls from gatekeeper");
45 static int callforward_filter __read_mostly
= 1;
46 module_param(callforward_filter
, bool, 0600);
47 MODULE_PARM_DESC(callforward_filter
, "only create call forwarding expectations "
48 "if both endpoints are on different sides "
49 "(determined by routing information)");
52 int (*set_h245_addr_hook
) (struct sk_buff
*skb
,
53 unsigned char **data
, int dataoff
,
54 H245_TransportAddress
*taddr
,
55 union nf_inet_addr
*addr
, __be16 port
)
57 int (*set_h225_addr_hook
) (struct sk_buff
*skb
,
58 unsigned char **data
, int dataoff
,
59 TransportAddress
*taddr
,
60 union nf_inet_addr
*addr
, __be16 port
)
62 int (*set_sig_addr_hook
) (struct sk_buff
*skb
,
64 enum ip_conntrack_info ctinfo
,
66 TransportAddress
*taddr
, int count
) __read_mostly
;
67 int (*set_ras_addr_hook
) (struct sk_buff
*skb
,
69 enum ip_conntrack_info ctinfo
,
71 TransportAddress
*taddr
, int count
) __read_mostly
;
72 int (*nat_rtp_rtcp_hook
) (struct sk_buff
*skb
,
74 enum ip_conntrack_info ctinfo
,
75 unsigned char **data
, int dataoff
,
76 H245_TransportAddress
*taddr
,
77 __be16 port
, __be16 rtp_port
,
78 struct nf_conntrack_expect
*rtp_exp
,
79 struct nf_conntrack_expect
*rtcp_exp
) __read_mostly
;
80 int (*nat_t120_hook
) (struct sk_buff
*skb
,
82 enum ip_conntrack_info ctinfo
,
83 unsigned char **data
, int dataoff
,
84 H245_TransportAddress
*taddr
, __be16 port
,
85 struct nf_conntrack_expect
*exp
) __read_mostly
;
86 int (*nat_h245_hook
) (struct sk_buff
*skb
,
88 enum ip_conntrack_info ctinfo
,
89 unsigned char **data
, int dataoff
,
90 TransportAddress
*taddr
, __be16 port
,
91 struct nf_conntrack_expect
*exp
) __read_mostly
;
92 int (*nat_callforwarding_hook
) (struct sk_buff
*skb
,
94 enum ip_conntrack_info ctinfo
,
95 unsigned char **data
, int dataoff
,
96 TransportAddress
*taddr
, __be16 port
,
97 struct nf_conntrack_expect
*exp
) __read_mostly
;
98 int (*nat_q931_hook
) (struct sk_buff
*skb
,
100 enum ip_conntrack_info ctinfo
,
101 unsigned char **data
, TransportAddress
*taddr
, int idx
,
102 __be16 port
, struct nf_conntrack_expect
*exp
)
105 static DEFINE_SPINLOCK(nf_h323_lock
);
106 static char *h323_buffer
;
108 static struct nf_conntrack_helper nf_conntrack_helper_h245
;
109 static struct nf_conntrack_helper nf_conntrack_helper_q931
[];
110 static struct nf_conntrack_helper nf_conntrack_helper_ras
[];
112 /****************************************************************************/
113 static int get_tpkt_data(struct sk_buff
*skb
, unsigned int protoff
,
114 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
,
115 unsigned char **data
, int *datalen
, int *dataoff
)
117 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
118 int dir
= CTINFO2DIR(ctinfo
);
119 const struct tcphdr
*th
;
128 th
= skb_header_pointer(skb
, protoff
, sizeof(_tcph
), &_tcph
);
132 /* Get TCP data offset */
133 tcpdataoff
= protoff
+ th
->doff
* 4;
135 /* Get TCP data length */
136 tcpdatalen
= skb
->len
- tcpdataoff
;
137 if (tcpdatalen
<= 0) /* No TCP data */
140 if (*data
== NULL
) { /* first TPKT */
141 /* Get first TPKT pointer */
142 tpkt
= skb_header_pointer(skb
, tcpdataoff
, tcpdatalen
,
144 BUG_ON(tpkt
== NULL
);
146 /* Validate TPKT identifier */
147 if (tcpdatalen
< 4 || tpkt
[0] != 0x03 || tpkt
[1] != 0) {
148 /* Netmeeting sends TPKT header and data separately */
149 if (info
->tpkt_len
[dir
] > 0) {
150 pr_debug("nf_ct_h323: previous packet "
151 "indicated separate TPKT data of %hu "
152 "bytes\n", info
->tpkt_len
[dir
]);
153 if (info
->tpkt_len
[dir
] <= tcpdatalen
) {
154 /* Yes, there was a TPKT header
157 *datalen
= info
->tpkt_len
[dir
];
162 /* Fragmented TPKT */
163 pr_debug("nf_ct_h323: fragmented TPKT\n");
167 /* It is not even a TPKT */
171 } else { /* Next TPKT */
172 tpktoff
= *dataoff
+ *datalen
;
173 tcpdatalen
-= tpktoff
;
174 if (tcpdatalen
<= 4) /* No more TPKT */
176 tpkt
= *data
+ *datalen
;
178 /* Validate TPKT identifier */
179 if (tpkt
[0] != 0x03 || tpkt
[1] != 0)
183 /* Validate TPKT length */
184 tpktlen
= tpkt
[2] * 256 + tpkt
[3];
187 if (tpktlen
> tcpdatalen
) {
188 if (tcpdatalen
== 4) { /* Separate TPKT header */
189 /* Netmeeting sends TPKT header and data separately */
190 pr_debug("nf_ct_h323: separate TPKT header indicates "
191 "there will be TPKT data of %hu bytes\n",
193 info
->tpkt_len
[dir
] = tpktlen
- 4;
197 pr_debug("nf_ct_h323: incomplete TPKT (fragmented?)\n");
201 /* This is the encapsulated data */
203 *datalen
= tpktlen
- 4;
204 *dataoff
= tpktoff
+ 4;
207 /* Clear TPKT length */
208 info
->tpkt_len
[dir
] = 0;
212 info
->tpkt_len
[dir
] = 0;
216 /****************************************************************************/
217 static int get_h245_addr(struct nf_conn
*ct
, const unsigned char *data
,
218 H245_TransportAddress
*taddr
,
219 union nf_inet_addr
*addr
, __be16
*port
)
221 const unsigned char *p
;
224 if (taddr
->choice
!= eH245_TransportAddress_unicastAddress
)
227 switch (taddr
->unicastAddress
.choice
) {
228 case eUnicastAddress_iPAddress
:
229 if (nf_ct_l3num(ct
) != AF_INET
)
231 p
= data
+ taddr
->unicastAddress
.iPAddress
.network
;
234 case eUnicastAddress_iP6Address
:
235 if (nf_ct_l3num(ct
) != AF_INET6
)
237 p
= data
+ taddr
->unicastAddress
.iP6Address
.network
;
244 memcpy(addr
, p
, len
);
245 memset((void *)addr
+ len
, 0, sizeof(*addr
) - len
);
246 memcpy(port
, p
+ len
, sizeof(__be16
));
251 /****************************************************************************/
252 static int expect_rtp_rtcp(struct sk_buff
*skb
, struct nf_conn
*ct
,
253 enum ip_conntrack_info ctinfo
,
254 unsigned char **data
, int dataoff
,
255 H245_TransportAddress
*taddr
)
257 int dir
= CTINFO2DIR(ctinfo
);
260 __be16 rtp_port
, rtcp_port
;
261 union nf_inet_addr addr
;
262 struct nf_conntrack_expect
*rtp_exp
;
263 struct nf_conntrack_expect
*rtcp_exp
;
264 typeof(nat_rtp_rtcp_hook
) nat_rtp_rtcp
;
266 /* Read RTP or RTCP address */
267 if (!get_h245_addr(ct
, *data
, taddr
, &addr
, &port
) ||
268 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) ||
272 /* RTP port is even */
275 rtcp_port
= htons(ntohs(port
) + 1);
277 /* Create expect for RTP */
278 if ((rtp_exp
= nf_ct_expect_alloc(ct
)) == NULL
)
280 nf_ct_expect_init(rtp_exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
281 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
282 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
283 IPPROTO_UDP
, NULL
, &rtp_port
);
285 /* Create expect for RTCP */
286 if ((rtcp_exp
= nf_ct_expect_alloc(ct
)) == NULL
) {
287 nf_ct_expect_put(rtp_exp
);
290 nf_ct_expect_init(rtcp_exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
291 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
292 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
293 IPPROTO_UDP
, NULL
, &rtcp_port
);
295 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
296 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
297 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
298 (nat_rtp_rtcp
= rcu_dereference(nat_rtp_rtcp_hook
)) &&
299 ct
->status
& IPS_NAT_MASK
) {
301 ret
= nat_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
302 taddr
, port
, rtp_port
, rtp_exp
, rtcp_exp
);
303 } else { /* Conntrack only */
304 if (nf_ct_expect_related(rtp_exp
) == 0) {
305 if (nf_ct_expect_related(rtcp_exp
) == 0) {
306 pr_debug("nf_ct_h323: expect RTP ");
307 nf_ct_dump_tuple(&rtp_exp
->tuple
);
308 pr_debug("nf_ct_h323: expect RTCP ");
309 nf_ct_dump_tuple(&rtcp_exp
->tuple
);
311 nf_ct_unexpect_related(rtp_exp
);
318 nf_ct_expect_put(rtp_exp
);
319 nf_ct_expect_put(rtcp_exp
);
324 /****************************************************************************/
325 static int expect_t120(struct sk_buff
*skb
,
327 enum ip_conntrack_info ctinfo
,
328 unsigned char **data
, int dataoff
,
329 H245_TransportAddress
*taddr
)
331 int dir
= CTINFO2DIR(ctinfo
);
334 union nf_inet_addr addr
;
335 struct nf_conntrack_expect
*exp
;
336 typeof(nat_t120_hook
) nat_t120
;
338 /* Read T.120 address */
339 if (!get_h245_addr(ct
, *data
, taddr
, &addr
, &port
) ||
340 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) ||
344 /* Create expect for T.120 connections */
345 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
347 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
348 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
349 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
350 IPPROTO_TCP
, NULL
, &port
);
351 exp
->flags
= NF_CT_EXPECT_PERMANENT
; /* Accept multiple channels */
353 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
354 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
355 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
356 (nat_t120
= rcu_dereference(nat_t120_hook
)) &&
357 ct
->status
& IPS_NAT_MASK
) {
359 ret
= nat_t120(skb
, ct
, ctinfo
, data
, dataoff
, taddr
,
361 } else { /* Conntrack only */
362 if (nf_ct_expect_related(exp
) == 0) {
363 pr_debug("nf_ct_h323: expect T.120 ");
364 nf_ct_dump_tuple(&exp
->tuple
);
369 nf_ct_expect_put(exp
);
374 /****************************************************************************/
375 static int process_h245_channel(struct sk_buff
*skb
,
377 enum ip_conntrack_info ctinfo
,
378 unsigned char **data
, int dataoff
,
379 H2250LogicalChannelParameters
*channel
)
383 if (channel
->options
& eH2250LogicalChannelParameters_mediaChannel
) {
385 ret
= expect_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
386 &channel
->mediaChannel
);
392 options
& eH2250LogicalChannelParameters_mediaControlChannel
) {
394 ret
= expect_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
395 &channel
->mediaControlChannel
);
403 /****************************************************************************/
404 static int process_olc(struct sk_buff
*skb
, struct nf_conn
*ct
,
405 enum ip_conntrack_info ctinfo
,
406 unsigned char **data
, int dataoff
,
407 OpenLogicalChannel
*olc
)
411 pr_debug("nf_ct_h323: OpenLogicalChannel\n");
413 if (olc
->forwardLogicalChannelParameters
.multiplexParameters
.choice
==
414 eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters
)
416 ret
= process_h245_channel(skb
, ct
, ctinfo
, data
, dataoff
,
418 forwardLogicalChannelParameters
.
420 h2250LogicalChannelParameters
);
426 eOpenLogicalChannel_reverseLogicalChannelParameters
) &&
427 (olc
->reverseLogicalChannelParameters
.options
&
428 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters
)
429 && (olc
->reverseLogicalChannelParameters
.multiplexParameters
.
431 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters
))
434 process_h245_channel(skb
, ct
, ctinfo
, data
, dataoff
,
436 reverseLogicalChannelParameters
.
438 h2250LogicalChannelParameters
);
443 if ((olc
->options
& eOpenLogicalChannel_separateStack
) &&
444 olc
->forwardLogicalChannelParameters
.dataType
.choice
==
446 olc
->forwardLogicalChannelParameters
.dataType
.data
.application
.
447 choice
== eDataApplicationCapability_application_t120
&&
448 olc
->forwardLogicalChannelParameters
.dataType
.data
.application
.
449 t120
.choice
== eDataProtocolCapability_separateLANStack
&&
450 olc
->separateStack
.networkAddress
.choice
==
451 eNetworkAccessParameters_networkAddress_localAreaAddress
) {
452 ret
= expect_t120(skb
, ct
, ctinfo
, data
, dataoff
,
453 &olc
->separateStack
.networkAddress
.
462 /****************************************************************************/
463 static int process_olca(struct sk_buff
*skb
, struct nf_conn
*ct
,
464 enum ip_conntrack_info ctinfo
,
465 unsigned char **data
, int dataoff
,
466 OpenLogicalChannelAck
*olca
)
468 H2250LogicalChannelAckParameters
*ack
;
471 pr_debug("nf_ct_h323: OpenLogicalChannelAck\n");
474 eOpenLogicalChannelAck_reverseLogicalChannelParameters
) &&
475 (olca
->reverseLogicalChannelParameters
.options
&
476 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters
)
477 && (olca
->reverseLogicalChannelParameters
.multiplexParameters
.
479 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters
))
481 ret
= process_h245_channel(skb
, ct
, ctinfo
, data
, dataoff
,
483 reverseLogicalChannelParameters
.
485 h2250LogicalChannelParameters
);
491 eOpenLogicalChannelAck_forwardMultiplexAckParameters
) &&
492 (olca
->forwardMultiplexAckParameters
.choice
==
493 eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters
))
495 ack
= &olca
->forwardMultiplexAckParameters
.
496 h2250LogicalChannelAckParameters
;
498 eH2250LogicalChannelAckParameters_mediaChannel
) {
500 ret
= expect_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
507 eH2250LogicalChannelAckParameters_mediaControlChannel
) {
509 ret
= expect_rtp_rtcp(skb
, ct
, ctinfo
, data
, dataoff
,
510 &ack
->mediaControlChannel
);
516 if ((olca
->options
& eOpenLogicalChannelAck_separateStack
) &&
517 olca
->separateStack
.networkAddress
.choice
==
518 eNetworkAccessParameters_networkAddress_localAreaAddress
) {
519 ret
= expect_t120(skb
, ct
, ctinfo
, data
, dataoff
,
520 &olca
->separateStack
.networkAddress
.
529 /****************************************************************************/
530 static int process_h245(struct sk_buff
*skb
, struct nf_conn
*ct
,
531 enum ip_conntrack_info ctinfo
,
532 unsigned char **data
, int dataoff
,
533 MultimediaSystemControlMessage
*mscm
)
535 switch (mscm
->choice
) {
536 case eMultimediaSystemControlMessage_request
:
537 if (mscm
->request
.choice
==
538 eRequestMessage_openLogicalChannel
) {
539 return process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
540 &mscm
->request
.openLogicalChannel
);
542 pr_debug("nf_ct_h323: H.245 Request %d\n",
543 mscm
->request
.choice
);
545 case eMultimediaSystemControlMessage_response
:
546 if (mscm
->response
.choice
==
547 eResponseMessage_openLogicalChannelAck
) {
548 return process_olca(skb
, ct
, ctinfo
, data
, dataoff
,
550 openLogicalChannelAck
);
552 pr_debug("nf_ct_h323: H.245 Response %d\n",
553 mscm
->response
.choice
);
556 pr_debug("nf_ct_h323: H.245 signal %d\n", mscm
->choice
);
563 /****************************************************************************/
564 static int h245_help(struct sk_buff
*skb
, unsigned int protoff
,
565 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
567 static MultimediaSystemControlMessage mscm
;
568 unsigned char *data
= NULL
;
573 /* Until there's been traffic both ways, don't look in packets. */
574 if (ctinfo
!= IP_CT_ESTABLISHED
&&
575 ctinfo
!= IP_CT_ESTABLISHED
+ IP_CT_IS_REPLY
) {
578 pr_debug("nf_ct_h245: skblen = %u\n", skb
->len
);
580 spin_lock_bh(&nf_h323_lock
);
582 /* Process each TPKT */
583 while (get_tpkt_data(skb
, protoff
, ct
, ctinfo
,
584 &data
, &datalen
, &dataoff
)) {
585 pr_debug("nf_ct_h245: TPKT len=%d ", datalen
);
586 nf_ct_dump_tuple(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
588 /* Decode H.245 signal */
589 ret
= DecodeMultimediaSystemControlMessage(data
, datalen
,
592 pr_debug("nf_ct_h245: decoding error: %s\n",
593 ret
== H323_ERROR_BOUND
?
594 "out of bound" : "out of range");
595 /* We don't drop when decoding error */
599 /* Process H.245 signal */
600 if (process_h245(skb
, ct
, ctinfo
, &data
, dataoff
, &mscm
) < 0)
604 spin_unlock_bh(&nf_h323_lock
);
608 spin_unlock_bh(&nf_h323_lock
);
610 pr_info("nf_ct_h245: packet dropped\n");
614 /****************************************************************************/
615 static const struct nf_conntrack_expect_policy h245_exp_policy
= {
616 .max_expected
= H323_RTP_CHANNEL_MAX
* 4 + 2 /* T.120 */,
620 static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly
= {
623 .tuple
.src
.l3num
= AF_UNSPEC
,
624 .tuple
.dst
.protonum
= IPPROTO_UDP
,
626 .expect_policy
= &h245_exp_policy
,
629 /****************************************************************************/
630 int get_h225_addr(struct nf_conn
*ct
, unsigned char *data
,
631 TransportAddress
*taddr
,
632 union nf_inet_addr
*addr
, __be16
*port
)
634 const unsigned char *p
;
637 switch (taddr
->choice
) {
638 case eTransportAddress_ipAddress
:
639 if (nf_ct_l3num(ct
) != AF_INET
)
641 p
= data
+ taddr
->ipAddress
.ip
;
644 case eTransportAddress_ip6Address
:
645 if (nf_ct_l3num(ct
) != AF_INET6
)
647 p
= data
+ taddr
->ip6Address
.ip
;
654 memcpy(addr
, p
, len
);
655 memset((void *)addr
+ len
, 0, sizeof(*addr
) - len
);
656 memcpy(port
, p
+ len
, sizeof(__be16
));
661 /****************************************************************************/
662 static int expect_h245(struct sk_buff
*skb
, struct nf_conn
*ct
,
663 enum ip_conntrack_info ctinfo
,
664 unsigned char **data
, int dataoff
,
665 TransportAddress
*taddr
)
667 int dir
= CTINFO2DIR(ctinfo
);
670 union nf_inet_addr addr
;
671 struct nf_conntrack_expect
*exp
;
672 typeof(nat_h245_hook
) nat_h245
;
674 /* Read h245Address */
675 if (!get_h225_addr(ct
, *data
, taddr
, &addr
, &port
) ||
676 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) ||
680 /* Create expect for h245 connection */
681 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
683 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
684 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
685 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
686 IPPROTO_TCP
, NULL
, &port
);
687 exp
->helper
= &nf_conntrack_helper_h245
;
689 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
690 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
691 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
692 (nat_h245
= rcu_dereference(nat_h245_hook
)) &&
693 ct
->status
& IPS_NAT_MASK
) {
695 ret
= nat_h245(skb
, ct
, ctinfo
, data
, dataoff
, taddr
,
697 } else { /* Conntrack only */
698 if (nf_ct_expect_related(exp
) == 0) {
699 pr_debug("nf_ct_q931: expect H.245 ");
700 nf_ct_dump_tuple(&exp
->tuple
);
705 nf_ct_expect_put(exp
);
710 /* If the calling party is on the same side of the forward-to party,
711 * we don't need to track the second call */
712 static int callforward_do_filter(const union nf_inet_addr
*src
,
713 const union nf_inet_addr
*dst
,
716 const struct nf_afinfo
*afinfo
;
719 /* rcu_read_lock()ed by nf_hook_slow() */
720 afinfo
= nf_get_afinfo(family
);
726 struct flowi4 fl1
, fl2
;
727 struct rtable
*rt1
, *rt2
;
729 memset(&fl1
, 0, sizeof(fl1
));
732 memset(&fl2
, 0, sizeof(fl2
));
734 if (!afinfo
->route(&init_net
, (struct dst_entry
**)&rt1
,
735 flowi4_to_flowi(&fl1
), false)) {
736 if (!afinfo
->route(&init_net
, (struct dst_entry
**)&rt2
,
737 flowi4_to_flowi(&fl2
), false)) {
738 if (rt1
->rt_gateway
== rt2
->rt_gateway
&&
739 rt1
->dst
.dev
== rt2
->dst
.dev
)
741 dst_release(&rt2
->dst
);
743 dst_release(&rt1
->dst
);
747 #if defined(CONFIG_NF_CONNTRACK_IPV6) || \
748 defined(CONFIG_NF_CONNTRACK_IPV6_MODULE)
750 struct flowi6 fl1
, fl2
;
751 struct rt6_info
*rt1
, *rt2
;
753 memset(&fl1
, 0, sizeof(fl1
));
754 ipv6_addr_copy(&fl1
.daddr
, &src
->in6
);
756 memset(&fl2
, 0, sizeof(fl2
));
757 ipv6_addr_copy(&fl2
.daddr
, &dst
->in6
);
758 if (!afinfo
->route(&init_net
, (struct dst_entry
**)&rt1
,
759 flowi6_to_flowi(&fl1
), false)) {
760 if (!afinfo
->route(&init_net
, (struct dst_entry
**)&rt2
,
761 flowi6_to_flowi(&fl2
), false)) {
762 if (!memcmp(&rt1
->rt6i_gateway
, &rt2
->rt6i_gateway
,
763 sizeof(rt1
->rt6i_gateway
)) &&
764 rt1
->dst
.dev
== rt2
->dst
.dev
)
766 dst_release(&rt2
->dst
);
768 dst_release(&rt1
->dst
);
778 /****************************************************************************/
779 static int expect_callforwarding(struct sk_buff
*skb
,
781 enum ip_conntrack_info ctinfo
,
782 unsigned char **data
, int dataoff
,
783 TransportAddress
*taddr
)
785 int dir
= CTINFO2DIR(ctinfo
);
788 union nf_inet_addr addr
;
789 struct nf_conntrack_expect
*exp
;
790 typeof(nat_callforwarding_hook
) nat_callforwarding
;
792 /* Read alternativeAddress */
793 if (!get_h225_addr(ct
, *data
, taddr
, &addr
, &port
) || port
== 0)
796 /* If the calling party is on the same side of the forward-to party,
797 * we don't need to track the second call */
798 if (callforward_filter
&&
799 callforward_do_filter(&addr
, &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
801 pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
805 /* Create expect for the second call leg */
806 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
808 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
809 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
810 IPPROTO_TCP
, NULL
, &port
);
811 exp
->helper
= nf_conntrack_helper_q931
;
813 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
814 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
815 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
816 (nat_callforwarding
= rcu_dereference(nat_callforwarding_hook
)) &&
817 ct
->status
& IPS_NAT_MASK
) {
819 ret
= nat_callforwarding(skb
, ct
, ctinfo
, data
, dataoff
,
821 } else { /* Conntrack only */
822 if (nf_ct_expect_related(exp
) == 0) {
823 pr_debug("nf_ct_q931: expect Call Forwarding ");
824 nf_ct_dump_tuple(&exp
->tuple
);
829 nf_ct_expect_put(exp
);
834 /****************************************************************************/
835 static int process_setup(struct sk_buff
*skb
, struct nf_conn
*ct
,
836 enum ip_conntrack_info ctinfo
,
837 unsigned char **data
, int dataoff
,
840 int dir
= CTINFO2DIR(ctinfo
);
844 union nf_inet_addr addr
;
845 typeof(set_h225_addr_hook
) set_h225_addr
;
847 pr_debug("nf_ct_q931: Setup\n");
849 if (setup
->options
& eSetup_UUIE_h245Address
) {
850 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
851 &setup
->h245Address
);
856 set_h225_addr
= rcu_dereference(set_h225_addr_hook
);
857 if ((setup
->options
& eSetup_UUIE_destCallSignalAddress
) &&
858 (set_h225_addr
) && ct
->status
& IPS_NAT_MASK
&&
859 get_h225_addr(ct
, *data
, &setup
->destCallSignalAddress
,
861 memcmp(&addr
, &ct
->tuplehash
[!dir
].tuple
.src
.u3
, sizeof(addr
))) {
862 pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n",
863 &addr
, ntohs(port
), &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
864 ntohs(ct
->tuplehash
[!dir
].tuple
.src
.u
.tcp
.port
));
865 ret
= set_h225_addr(skb
, data
, dataoff
,
866 &setup
->destCallSignalAddress
,
867 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
868 ct
->tuplehash
[!dir
].tuple
.src
.u
.tcp
.port
);
873 if ((setup
->options
& eSetup_UUIE_sourceCallSignalAddress
) &&
874 (set_h225_addr
) && ct
->status
& IPS_NAT_MASK
&&
875 get_h225_addr(ct
, *data
, &setup
->sourceCallSignalAddress
,
877 memcmp(&addr
, &ct
->tuplehash
[!dir
].tuple
.dst
.u3
, sizeof(addr
))) {
878 pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n",
879 &addr
, ntohs(port
), &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
880 ntohs(ct
->tuplehash
[!dir
].tuple
.dst
.u
.tcp
.port
));
881 ret
= set_h225_addr(skb
, data
, dataoff
,
882 &setup
->sourceCallSignalAddress
,
883 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
884 ct
->tuplehash
[!dir
].tuple
.dst
.u
.tcp
.port
);
889 if (setup
->options
& eSetup_UUIE_fastStart
) {
890 for (i
= 0; i
< setup
->fastStart
.count
; i
++) {
891 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
892 &setup
->fastStart
.item
[i
]);
901 /****************************************************************************/
902 static int process_callproceeding(struct sk_buff
*skb
,
904 enum ip_conntrack_info ctinfo
,
905 unsigned char **data
, int dataoff
,
906 CallProceeding_UUIE
*callproc
)
911 pr_debug("nf_ct_q931: CallProceeding\n");
913 if (callproc
->options
& eCallProceeding_UUIE_h245Address
) {
914 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
915 &callproc
->h245Address
);
920 if (callproc
->options
& eCallProceeding_UUIE_fastStart
) {
921 for (i
= 0; i
< callproc
->fastStart
.count
; i
++) {
922 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
923 &callproc
->fastStart
.item
[i
]);
932 /****************************************************************************/
933 static int process_connect(struct sk_buff
*skb
, struct nf_conn
*ct
,
934 enum ip_conntrack_info ctinfo
,
935 unsigned char **data
, int dataoff
,
936 Connect_UUIE
*connect
)
941 pr_debug("nf_ct_q931: Connect\n");
943 if (connect
->options
& eConnect_UUIE_h245Address
) {
944 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
945 &connect
->h245Address
);
950 if (connect
->options
& eConnect_UUIE_fastStart
) {
951 for (i
= 0; i
< connect
->fastStart
.count
; i
++) {
952 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
953 &connect
->fastStart
.item
[i
]);
962 /****************************************************************************/
963 static int process_alerting(struct sk_buff
*skb
, struct nf_conn
*ct
,
964 enum ip_conntrack_info ctinfo
,
965 unsigned char **data
, int dataoff
,
966 Alerting_UUIE
*alert
)
971 pr_debug("nf_ct_q931: Alerting\n");
973 if (alert
->options
& eAlerting_UUIE_h245Address
) {
974 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
975 &alert
->h245Address
);
980 if (alert
->options
& eAlerting_UUIE_fastStart
) {
981 for (i
= 0; i
< alert
->fastStart
.count
; i
++) {
982 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
983 &alert
->fastStart
.item
[i
]);
992 /****************************************************************************/
993 static int process_facility(struct sk_buff
*skb
, struct nf_conn
*ct
,
994 enum ip_conntrack_info ctinfo
,
995 unsigned char **data
, int dataoff
,
996 Facility_UUIE
*facility
)
1001 pr_debug("nf_ct_q931: Facility\n");
1003 if (facility
->reason
.choice
== eFacilityReason_callForwarded
) {
1004 if (facility
->options
& eFacility_UUIE_alternativeAddress
)
1005 return expect_callforwarding(skb
, ct
, ctinfo
, data
,
1008 alternativeAddress
);
1012 if (facility
->options
& eFacility_UUIE_h245Address
) {
1013 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
1014 &facility
->h245Address
);
1019 if (facility
->options
& eFacility_UUIE_fastStart
) {
1020 for (i
= 0; i
< facility
->fastStart
.count
; i
++) {
1021 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
1022 &facility
->fastStart
.item
[i
]);
1031 /****************************************************************************/
1032 static int process_progress(struct sk_buff
*skb
, struct nf_conn
*ct
,
1033 enum ip_conntrack_info ctinfo
,
1034 unsigned char **data
, int dataoff
,
1035 Progress_UUIE
*progress
)
1040 pr_debug("nf_ct_q931: Progress\n");
1042 if (progress
->options
& eProgress_UUIE_h245Address
) {
1043 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
1044 &progress
->h245Address
);
1049 if (progress
->options
& eProgress_UUIE_fastStart
) {
1050 for (i
= 0; i
< progress
->fastStart
.count
; i
++) {
1051 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
1052 &progress
->fastStart
.item
[i
]);
1061 /****************************************************************************/
1062 static int process_q931(struct sk_buff
*skb
, struct nf_conn
*ct
,
1063 enum ip_conntrack_info ctinfo
,
1064 unsigned char **data
, int dataoff
, Q931
*q931
)
1066 H323_UU_PDU
*pdu
= &q931
->UUIE
.h323_uu_pdu
;
1070 switch (pdu
->h323_message_body
.choice
) {
1071 case eH323_UU_PDU_h323_message_body_setup
:
1072 ret
= process_setup(skb
, ct
, ctinfo
, data
, dataoff
,
1073 &pdu
->h323_message_body
.setup
);
1075 case eH323_UU_PDU_h323_message_body_callProceeding
:
1076 ret
= process_callproceeding(skb
, ct
, ctinfo
, data
, dataoff
,
1077 &pdu
->h323_message_body
.
1080 case eH323_UU_PDU_h323_message_body_connect
:
1081 ret
= process_connect(skb
, ct
, ctinfo
, data
, dataoff
,
1082 &pdu
->h323_message_body
.connect
);
1084 case eH323_UU_PDU_h323_message_body_alerting
:
1085 ret
= process_alerting(skb
, ct
, ctinfo
, data
, dataoff
,
1086 &pdu
->h323_message_body
.alerting
);
1088 case eH323_UU_PDU_h323_message_body_facility
:
1089 ret
= process_facility(skb
, ct
, ctinfo
, data
, dataoff
,
1090 &pdu
->h323_message_body
.facility
);
1092 case eH323_UU_PDU_h323_message_body_progress
:
1093 ret
= process_progress(skb
, ct
, ctinfo
, data
, dataoff
,
1094 &pdu
->h323_message_body
.progress
);
1097 pr_debug("nf_ct_q931: Q.931 signal %d\n",
1098 pdu
->h323_message_body
.choice
);
1105 if (pdu
->options
& eH323_UU_PDU_h245Control
) {
1106 for (i
= 0; i
< pdu
->h245Control
.count
; i
++) {
1107 ret
= process_h245(skb
, ct
, ctinfo
, data
, dataoff
,
1108 &pdu
->h245Control
.item
[i
]);
1117 /****************************************************************************/
1118 static int q931_help(struct sk_buff
*skb
, unsigned int protoff
,
1119 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
1122 unsigned char *data
= NULL
;
1127 /* Until there's been traffic both ways, don't look in packets. */
1128 if (ctinfo
!= IP_CT_ESTABLISHED
&&
1129 ctinfo
!= IP_CT_ESTABLISHED
+ IP_CT_IS_REPLY
) {
1132 pr_debug("nf_ct_q931: skblen = %u\n", skb
->len
);
1134 spin_lock_bh(&nf_h323_lock
);
1136 /* Process each TPKT */
1137 while (get_tpkt_data(skb
, protoff
, ct
, ctinfo
,
1138 &data
, &datalen
, &dataoff
)) {
1139 pr_debug("nf_ct_q931: TPKT len=%d ", datalen
);
1140 nf_ct_dump_tuple(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
1142 /* Decode Q.931 signal */
1143 ret
= DecodeQ931(data
, datalen
, &q931
);
1145 pr_debug("nf_ct_q931: decoding error: %s\n",
1146 ret
== H323_ERROR_BOUND
?
1147 "out of bound" : "out of range");
1148 /* We don't drop when decoding error */
1152 /* Process Q.931 signal */
1153 if (process_q931(skb
, ct
, ctinfo
, &data
, dataoff
, &q931
) < 0)
1157 spin_unlock_bh(&nf_h323_lock
);
1161 spin_unlock_bh(&nf_h323_lock
);
1162 if (net_ratelimit())
1163 pr_info("nf_ct_q931: packet dropped\n");
1167 /****************************************************************************/
1168 static const struct nf_conntrack_expect_policy q931_exp_policy
= {
1169 /* T.120 and H.245 */
1170 .max_expected
= H323_RTP_CHANNEL_MAX
* 4 + 4,
1174 static struct nf_conntrack_helper nf_conntrack_helper_q931
[] __read_mostly
= {
1178 .tuple
.src
.l3num
= AF_INET
,
1179 .tuple
.src
.u
.tcp
.port
= cpu_to_be16(Q931_PORT
),
1180 .tuple
.dst
.protonum
= IPPROTO_TCP
,
1182 .expect_policy
= &q931_exp_policy
,
1187 .tuple
.src
.l3num
= AF_INET6
,
1188 .tuple
.src
.u
.tcp
.port
= cpu_to_be16(Q931_PORT
),
1189 .tuple
.dst
.protonum
= IPPROTO_TCP
,
1191 .expect_policy
= &q931_exp_policy
,
1195 /****************************************************************************/
1196 static unsigned char *get_udp_data(struct sk_buff
*skb
, unsigned int protoff
,
1199 const struct udphdr
*uh
;
1203 uh
= skb_header_pointer(skb
, protoff
, sizeof(_uh
), &_uh
);
1206 dataoff
= protoff
+ sizeof(_uh
);
1207 if (dataoff
>= skb
->len
)
1209 *datalen
= skb
->len
- dataoff
;
1210 return skb_header_pointer(skb
, dataoff
, *datalen
, h323_buffer
);
1213 /****************************************************************************/
1214 static struct nf_conntrack_expect
*find_expect(struct nf_conn
*ct
,
1215 union nf_inet_addr
*addr
,
1218 struct net
*net
= nf_ct_net(ct
);
1219 struct nf_conntrack_expect
*exp
;
1220 struct nf_conntrack_tuple tuple
;
1222 memset(&tuple
.src
.u3
, 0, sizeof(tuple
.src
.u3
));
1223 tuple
.src
.u
.tcp
.port
= 0;
1224 memcpy(&tuple
.dst
.u3
, addr
, sizeof(tuple
.dst
.u3
));
1225 tuple
.dst
.u
.tcp
.port
= port
;
1226 tuple
.dst
.protonum
= IPPROTO_TCP
;
1228 exp
= __nf_ct_expect_find(net
, nf_ct_zone(ct
), &tuple
);
1229 if (exp
&& exp
->master
== ct
)
1234 /****************************************************************************/
1235 static int set_expect_timeout(struct nf_conntrack_expect
*exp
,
1238 if (!exp
|| !del_timer(&exp
->timeout
))
1241 exp
->timeout
.expires
= jiffies
+ timeout
* HZ
;
1242 add_timer(&exp
->timeout
);
1247 /****************************************************************************/
1248 static int expect_q931(struct sk_buff
*skb
, struct nf_conn
*ct
,
1249 enum ip_conntrack_info ctinfo
,
1250 unsigned char **data
,
1251 TransportAddress
*taddr
, int count
)
1253 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1254 int dir
= CTINFO2DIR(ctinfo
);
1258 union nf_inet_addr addr
;
1259 struct nf_conntrack_expect
*exp
;
1260 typeof(nat_q931_hook
) nat_q931
;
1262 /* Look for the first related address */
1263 for (i
= 0; i
< count
; i
++) {
1264 if (get_h225_addr(ct
, *data
, &taddr
[i
], &addr
, &port
) &&
1265 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
,
1266 sizeof(addr
)) == 0 && port
!= 0)
1270 if (i
>= count
) /* Not found */
1273 /* Create expect for Q.931 */
1274 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1276 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1277 gkrouted_only
? /* only accept calls from GK? */
1278 &ct
->tuplehash
[!dir
].tuple
.src
.u3
: NULL
,
1279 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1280 IPPROTO_TCP
, NULL
, &port
);
1281 exp
->helper
= nf_conntrack_helper_q931
;
1282 exp
->flags
= NF_CT_EXPECT_PERMANENT
; /* Accept multiple calls */
1284 nat_q931
= rcu_dereference(nat_q931_hook
);
1285 if (nat_q931
&& ct
->status
& IPS_NAT_MASK
) { /* Need NAT */
1286 ret
= nat_q931(skb
, ct
, ctinfo
, data
, taddr
, i
, port
, exp
);
1287 } else { /* Conntrack only */
1288 if (nf_ct_expect_related(exp
) == 0) {
1289 pr_debug("nf_ct_ras: expect Q.931 ");
1290 nf_ct_dump_tuple(&exp
->tuple
);
1292 /* Save port for looking up expect in processing RCF */
1293 info
->sig_port
[dir
] = port
;
1298 nf_ct_expect_put(exp
);
1303 /****************************************************************************/
1304 static int process_grq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1305 enum ip_conntrack_info ctinfo
,
1306 unsigned char **data
, GatekeeperRequest
*grq
)
1308 typeof(set_ras_addr_hook
) set_ras_addr
;
1310 pr_debug("nf_ct_ras: GRQ\n");
1312 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1313 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) /* NATed */
1314 return set_ras_addr(skb
, ct
, ctinfo
, data
,
1315 &grq
->rasAddress
, 1);
1319 /****************************************************************************/
1320 static int process_gcf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1321 enum ip_conntrack_info ctinfo
,
1322 unsigned char **data
, GatekeeperConfirm
*gcf
)
1324 int dir
= CTINFO2DIR(ctinfo
);
1327 union nf_inet_addr addr
;
1328 struct nf_conntrack_expect
*exp
;
1330 pr_debug("nf_ct_ras: GCF\n");
1332 if (!get_h225_addr(ct
, *data
, &gcf
->rasAddress
, &addr
, &port
))
1335 /* Registration port is the same as discovery port */
1336 if (!memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1337 port
== ct
->tuplehash
[dir
].tuple
.src
.u
.udp
.port
)
1340 /* Avoid RAS expectation loops. A GCF is never expected. */
1341 if (test_bit(IPS_EXPECTED_BIT
, &ct
->status
))
1344 /* Need new expect */
1345 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1347 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1348 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1349 IPPROTO_UDP
, NULL
, &port
);
1350 exp
->helper
= nf_conntrack_helper_ras
;
1352 if (nf_ct_expect_related(exp
) == 0) {
1353 pr_debug("nf_ct_ras: expect RAS ");
1354 nf_ct_dump_tuple(&exp
->tuple
);
1358 nf_ct_expect_put(exp
);
1363 /****************************************************************************/
1364 static int process_rrq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1365 enum ip_conntrack_info ctinfo
,
1366 unsigned char **data
, RegistrationRequest
*rrq
)
1368 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1370 typeof(set_ras_addr_hook
) set_ras_addr
;
1372 pr_debug("nf_ct_ras: RRQ\n");
1374 ret
= expect_q931(skb
, ct
, ctinfo
, data
,
1375 rrq
->callSignalAddress
.item
,
1376 rrq
->callSignalAddress
.count
);
1380 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1381 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) {
1382 ret
= set_ras_addr(skb
, ct
, ctinfo
, data
,
1383 rrq
->rasAddress
.item
,
1384 rrq
->rasAddress
.count
);
1389 if (rrq
->options
& eRegistrationRequest_timeToLive
) {
1390 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq
->timeToLive
);
1391 info
->timeout
= rrq
->timeToLive
;
1393 info
->timeout
= default_rrq_ttl
;
1398 /****************************************************************************/
1399 static int process_rcf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1400 enum ip_conntrack_info ctinfo
,
1401 unsigned char **data
, RegistrationConfirm
*rcf
)
1403 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1404 int dir
= CTINFO2DIR(ctinfo
);
1406 struct nf_conntrack_expect
*exp
;
1407 typeof(set_sig_addr_hook
) set_sig_addr
;
1409 pr_debug("nf_ct_ras: RCF\n");
1411 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1412 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1413 ret
= set_sig_addr(skb
, ct
, ctinfo
, data
,
1414 rcf
->callSignalAddress
.item
,
1415 rcf
->callSignalAddress
.count
);
1420 if (rcf
->options
& eRegistrationConfirm_timeToLive
) {
1421 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf
->timeToLive
);
1422 info
->timeout
= rcf
->timeToLive
;
1425 if (info
->timeout
> 0) {
1426 pr_debug("nf_ct_ras: set RAS connection timeout to "
1427 "%u seconds\n", info
->timeout
);
1428 nf_ct_refresh(ct
, skb
, info
->timeout
* HZ
);
1430 /* Set expect timeout */
1431 spin_lock_bh(&nf_conntrack_lock
);
1432 exp
= find_expect(ct
, &ct
->tuplehash
[dir
].tuple
.dst
.u3
,
1433 info
->sig_port
[!dir
]);
1435 pr_debug("nf_ct_ras: set Q.931 expect "
1436 "timeout to %u seconds for",
1438 nf_ct_dump_tuple(&exp
->tuple
);
1439 set_expect_timeout(exp
, info
->timeout
);
1441 spin_unlock_bh(&nf_conntrack_lock
);
1447 /****************************************************************************/
1448 static int process_urq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1449 enum ip_conntrack_info ctinfo
,
1450 unsigned char **data
, UnregistrationRequest
*urq
)
1452 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1453 int dir
= CTINFO2DIR(ctinfo
);
1455 typeof(set_sig_addr_hook
) set_sig_addr
;
1457 pr_debug("nf_ct_ras: URQ\n");
1459 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1460 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1461 ret
= set_sig_addr(skb
, ct
, ctinfo
, data
,
1462 urq
->callSignalAddress
.item
,
1463 urq
->callSignalAddress
.count
);
1468 /* Clear old expect */
1469 nf_ct_remove_expectations(ct
);
1470 info
->sig_port
[dir
] = 0;
1471 info
->sig_port
[!dir
] = 0;
1473 /* Give it 30 seconds for UCF or URJ */
1474 nf_ct_refresh(ct
, skb
, 30 * HZ
);
1479 /****************************************************************************/
1480 static int process_arq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1481 enum ip_conntrack_info ctinfo
,
1482 unsigned char **data
, AdmissionRequest
*arq
)
1484 const struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1485 int dir
= CTINFO2DIR(ctinfo
);
1487 union nf_inet_addr addr
;
1488 typeof(set_h225_addr_hook
) set_h225_addr
;
1490 pr_debug("nf_ct_ras: ARQ\n");
1492 set_h225_addr
= rcu_dereference(set_h225_addr_hook
);
1493 if ((arq
->options
& eAdmissionRequest_destCallSignalAddress
) &&
1494 get_h225_addr(ct
, *data
, &arq
->destCallSignalAddress
,
1496 !memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1497 port
== info
->sig_port
[dir
] &&
1498 set_h225_addr
&& ct
->status
& IPS_NAT_MASK
) {
1500 return set_h225_addr(skb
, data
, 0,
1501 &arq
->destCallSignalAddress
,
1502 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1503 info
->sig_port
[!dir
]);
1506 if ((arq
->options
& eAdmissionRequest_srcCallSignalAddress
) &&
1507 get_h225_addr(ct
, *data
, &arq
->srcCallSignalAddress
,
1509 !memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1510 set_h225_addr
&& ct
->status
& IPS_NAT_MASK
) {
1512 return set_h225_addr(skb
, data
, 0,
1513 &arq
->srcCallSignalAddress
,
1514 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1521 /****************************************************************************/
1522 static int process_acf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1523 enum ip_conntrack_info ctinfo
,
1524 unsigned char **data
, AdmissionConfirm
*acf
)
1526 int dir
= CTINFO2DIR(ctinfo
);
1529 union nf_inet_addr addr
;
1530 struct nf_conntrack_expect
*exp
;
1531 typeof(set_sig_addr_hook
) set_sig_addr
;
1533 pr_debug("nf_ct_ras: ACF\n");
1535 if (!get_h225_addr(ct
, *data
, &acf
->destCallSignalAddress
,
1539 if (!memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.dst
.u3
, sizeof(addr
))) {
1541 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1542 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
)
1543 return set_sig_addr(skb
, ct
, ctinfo
, data
,
1544 &acf
->destCallSignalAddress
, 1);
1548 /* Need new expect */
1549 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1551 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1552 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1553 IPPROTO_TCP
, NULL
, &port
);
1554 exp
->flags
= NF_CT_EXPECT_PERMANENT
;
1555 exp
->helper
= nf_conntrack_helper_q931
;
1557 if (nf_ct_expect_related(exp
) == 0) {
1558 pr_debug("nf_ct_ras: expect Q.931 ");
1559 nf_ct_dump_tuple(&exp
->tuple
);
1563 nf_ct_expect_put(exp
);
1568 /****************************************************************************/
1569 static int process_lrq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1570 enum ip_conntrack_info ctinfo
,
1571 unsigned char **data
, LocationRequest
*lrq
)
1573 typeof(set_ras_addr_hook
) set_ras_addr
;
1575 pr_debug("nf_ct_ras: LRQ\n");
1577 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1578 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
)
1579 return set_ras_addr(skb
, ct
, ctinfo
, data
,
1580 &lrq
->replyAddress
, 1);
1584 /****************************************************************************/
1585 static int process_lcf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1586 enum ip_conntrack_info ctinfo
,
1587 unsigned char **data
, LocationConfirm
*lcf
)
1589 int dir
= CTINFO2DIR(ctinfo
);
1592 union nf_inet_addr addr
;
1593 struct nf_conntrack_expect
*exp
;
1595 pr_debug("nf_ct_ras: LCF\n");
1597 if (!get_h225_addr(ct
, *data
, &lcf
->callSignalAddress
,
1601 /* Need new expect for call signal */
1602 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1604 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1605 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1606 IPPROTO_TCP
, NULL
, &port
);
1607 exp
->flags
= NF_CT_EXPECT_PERMANENT
;
1608 exp
->helper
= nf_conntrack_helper_q931
;
1610 if (nf_ct_expect_related(exp
) == 0) {
1611 pr_debug("nf_ct_ras: expect Q.931 ");
1612 nf_ct_dump_tuple(&exp
->tuple
);
1616 nf_ct_expect_put(exp
);
1618 /* Ignore rasAddress */
1623 /****************************************************************************/
1624 static int process_irr(struct sk_buff
*skb
, struct nf_conn
*ct
,
1625 enum ip_conntrack_info ctinfo
,
1626 unsigned char **data
, InfoRequestResponse
*irr
)
1629 typeof(set_ras_addr_hook
) set_ras_addr
;
1630 typeof(set_sig_addr_hook
) set_sig_addr
;
1632 pr_debug("nf_ct_ras: IRR\n");
1634 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1635 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) {
1636 ret
= set_ras_addr(skb
, ct
, ctinfo
, data
,
1637 &irr
->rasAddress
, 1);
1642 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1643 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1644 ret
= set_sig_addr(skb
, ct
, ctinfo
, data
,
1645 irr
->callSignalAddress
.item
,
1646 irr
->callSignalAddress
.count
);
1654 /****************************************************************************/
1655 static int process_ras(struct sk_buff
*skb
, struct nf_conn
*ct
,
1656 enum ip_conntrack_info ctinfo
,
1657 unsigned char **data
, RasMessage
*ras
)
1659 switch (ras
->choice
) {
1660 case eRasMessage_gatekeeperRequest
:
1661 return process_grq(skb
, ct
, ctinfo
, data
,
1662 &ras
->gatekeeperRequest
);
1663 case eRasMessage_gatekeeperConfirm
:
1664 return process_gcf(skb
, ct
, ctinfo
, data
,
1665 &ras
->gatekeeperConfirm
);
1666 case eRasMessage_registrationRequest
:
1667 return process_rrq(skb
, ct
, ctinfo
, data
,
1668 &ras
->registrationRequest
);
1669 case eRasMessage_registrationConfirm
:
1670 return process_rcf(skb
, ct
, ctinfo
, data
,
1671 &ras
->registrationConfirm
);
1672 case eRasMessage_unregistrationRequest
:
1673 return process_urq(skb
, ct
, ctinfo
, data
,
1674 &ras
->unregistrationRequest
);
1675 case eRasMessage_admissionRequest
:
1676 return process_arq(skb
, ct
, ctinfo
, data
,
1677 &ras
->admissionRequest
);
1678 case eRasMessage_admissionConfirm
:
1679 return process_acf(skb
, ct
, ctinfo
, data
,
1680 &ras
->admissionConfirm
);
1681 case eRasMessage_locationRequest
:
1682 return process_lrq(skb
, ct
, ctinfo
, data
,
1683 &ras
->locationRequest
);
1684 case eRasMessage_locationConfirm
:
1685 return process_lcf(skb
, ct
, ctinfo
, data
,
1686 &ras
->locationConfirm
);
1687 case eRasMessage_infoRequestResponse
:
1688 return process_irr(skb
, ct
, ctinfo
, data
,
1689 &ras
->infoRequestResponse
);
1691 pr_debug("nf_ct_ras: RAS message %d\n", ras
->choice
);
1698 /****************************************************************************/
1699 static int ras_help(struct sk_buff
*skb
, unsigned int protoff
,
1700 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
1702 static RasMessage ras
;
1703 unsigned char *data
;
1707 pr_debug("nf_ct_ras: skblen = %u\n", skb
->len
);
1709 spin_lock_bh(&nf_h323_lock
);
1712 data
= get_udp_data(skb
, protoff
, &datalen
);
1715 pr_debug("nf_ct_ras: RAS message len=%d ", datalen
);
1716 nf_ct_dump_tuple(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
1718 /* Decode RAS message */
1719 ret
= DecodeRasMessage(data
, datalen
, &ras
);
1721 pr_debug("nf_ct_ras: decoding error: %s\n",
1722 ret
== H323_ERROR_BOUND
?
1723 "out of bound" : "out of range");
1727 /* Process RAS message */
1728 if (process_ras(skb
, ct
, ctinfo
, &data
, &ras
) < 0)
1732 spin_unlock_bh(&nf_h323_lock
);
1736 spin_unlock_bh(&nf_h323_lock
);
1737 if (net_ratelimit())
1738 pr_info("nf_ct_ras: packet dropped\n");
1742 /****************************************************************************/
1743 static const struct nf_conntrack_expect_policy ras_exp_policy
= {
1748 static struct nf_conntrack_helper nf_conntrack_helper_ras
[] __read_mostly
= {
1752 .tuple
.src
.l3num
= AF_INET
,
1753 .tuple
.src
.u
.udp
.port
= cpu_to_be16(RAS_PORT
),
1754 .tuple
.dst
.protonum
= IPPROTO_UDP
,
1756 .expect_policy
= &ras_exp_policy
,
1761 .tuple
.src
.l3num
= AF_INET6
,
1762 .tuple
.src
.u
.udp
.port
= cpu_to_be16(RAS_PORT
),
1763 .tuple
.dst
.protonum
= IPPROTO_UDP
,
1765 .expect_policy
= &ras_exp_policy
,
1769 /****************************************************************************/
1770 static void __exit
nf_conntrack_h323_fini(void)
1772 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[1]);
1773 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[0]);
1774 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[1]);
1775 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[0]);
1776 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245
);
1778 pr_debug("nf_ct_h323: fini\n");
1781 /****************************************************************************/
1782 static int __init
nf_conntrack_h323_init(void)
1786 h323_buffer
= kmalloc(65536, GFP_KERNEL
);
1789 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_h245
);
1792 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_q931
[0]);
1795 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_q931
[1]);
1798 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_ras
[0]);
1801 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_ras
[1]);
1804 pr_debug("nf_ct_h323: init success\n");
1808 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[0]);
1810 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[1]);
1812 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[0]);
1814 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245
);
1820 /****************************************************************************/
1821 module_init(nf_conntrack_h323_init
);
1822 module_exit(nf_conntrack_h323_fini
);
1824 EXPORT_SYMBOL_GPL(get_h225_addr
);
1825 EXPORT_SYMBOL_GPL(set_h245_addr_hook
);
1826 EXPORT_SYMBOL_GPL(set_h225_addr_hook
);
1827 EXPORT_SYMBOL_GPL(set_sig_addr_hook
);
1828 EXPORT_SYMBOL_GPL(set_ras_addr_hook
);
1829 EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook
);
1830 EXPORT_SYMBOL_GPL(nat_t120_hook
);
1831 EXPORT_SYMBOL_GPL(nat_h245_hook
);
1832 EXPORT_SYMBOL_GPL(nat_callforwarding_hook
);
1833 EXPORT_SYMBOL_GPL(nat_q931_hook
);
1835 MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1836 MODULE_DESCRIPTION("H.323 connection tracking helper");
1837 MODULE_LICENSE("GPL");
1838 MODULE_ALIAS("ip_conntrack_h323");
1839 MODULE_ALIAS_NFCT_HELPER("h323");