2 * H.323 connection tracking helper
4 * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net>
6 * This source code is licensed under General Public License version 2.
8 * Based on the 'brute force' H.323 connection tracking module by
9 * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
11 * For more information, please see http://nath323.sourceforge.net/
14 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/ctype.h>
17 #include <linux/inet.h>
20 #include <linux/udp.h>
21 #include <linux/tcp.h>
22 #include <linux/skbuff.h>
23 #include <net/route.h>
24 #include <net/ip6_route.h>
26 #include <net/netfilter/nf_conntrack.h>
27 #include <net/netfilter/nf_conntrack_core.h>
28 #include <net/netfilter/nf_conntrack_tuple.h>
29 #include <net/netfilter/nf_conntrack_expect.h>
30 #include <net/netfilter/nf_conntrack_ecache.h>
31 #include <net/netfilter/nf_conntrack_helper.h>
32 #include <linux/netfilter/nf_conntrack_h323.h>
35 static unsigned int default_rrq_ttl __read_mostly
= 300;
36 module_param(default_rrq_ttl
, uint
, 0600);
37 MODULE_PARM_DESC(default_rrq_ttl
, "use this TTL if it's missing in RRQ");
39 static int gkrouted_only __read_mostly
= 1;
40 module_param(gkrouted_only
, int, 0600);
41 MODULE_PARM_DESC(gkrouted_only
, "only accept calls from gatekeeper");
43 static int callforward_filter __read_mostly
= 1;
44 module_param(callforward_filter
, bool, 0600);
45 MODULE_PARM_DESC(callforward_filter
, "only create call forwarding expectations "
46 "if both endpoints are on different sides "
47 "(determined by routing information)");
50 int (*set_h245_addr_hook
) (struct sk_buff
*skb
,
51 unsigned char **data
, int dataoff
,
52 H245_TransportAddress
*taddr
,
53 union nf_inet_addr
*addr
, __be16 port
)
55 int (*set_h225_addr_hook
) (struct sk_buff
*skb
,
56 unsigned char **data
, int dataoff
,
57 TransportAddress
*taddr
,
58 union nf_inet_addr
*addr
, __be16 port
)
60 int (*set_sig_addr_hook
) (struct sk_buff
*skb
,
62 enum ip_conntrack_info ctinfo
,
64 TransportAddress
*taddr
, int count
) __read_mostly
;
65 int (*set_ras_addr_hook
) (struct sk_buff
*skb
,
67 enum ip_conntrack_info ctinfo
,
69 TransportAddress
*taddr
, int count
) __read_mostly
;
70 int (*nat_rtp_rtcp_hook
) (struct sk_buff
*skb
,
72 enum ip_conntrack_info ctinfo
,
73 unsigned char **data
, int dataoff
,
74 H245_TransportAddress
*taddr
,
75 __be16 port
, __be16 rtp_port
,
76 struct nf_conntrack_expect
*rtp_exp
,
77 struct nf_conntrack_expect
*rtcp_exp
) __read_mostly
;
78 int (*nat_t120_hook
) (struct sk_buff
*skb
,
80 enum ip_conntrack_info ctinfo
,
81 unsigned char **data
, int dataoff
,
82 H245_TransportAddress
*taddr
, __be16 port
,
83 struct nf_conntrack_expect
*exp
) __read_mostly
;
84 int (*nat_h245_hook
) (struct sk_buff
*skb
,
86 enum ip_conntrack_info ctinfo
,
87 unsigned char **data
, int dataoff
,
88 TransportAddress
*taddr
, __be16 port
,
89 struct nf_conntrack_expect
*exp
) __read_mostly
;
90 int (*nat_callforwarding_hook
) (struct sk_buff
*skb
,
92 enum ip_conntrack_info ctinfo
,
93 unsigned char **data
, int dataoff
,
94 TransportAddress
*taddr
, __be16 port
,
95 struct nf_conntrack_expect
*exp
) __read_mostly
;
96 int (*nat_q931_hook
) (struct sk_buff
*skb
,
98 enum ip_conntrack_info ctinfo
,
99 unsigned char **data
, TransportAddress
*taddr
, int idx
,
100 __be16 port
, struct nf_conntrack_expect
*exp
)
103 static DEFINE_SPINLOCK(nf_h323_lock
);
104 static char *h323_buffer
;
106 static struct nf_conntrack_helper nf_conntrack_helper_h245
;
107 static struct nf_conntrack_helper nf_conntrack_helper_q931
[];
108 static struct nf_conntrack_helper nf_conntrack_helper_ras
[];
110 /****************************************************************************/
111 static int get_tpkt_data(struct sk_buff
*skb
, unsigned int protoff
,
112 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
,
113 unsigned char **data
, int *datalen
, int *dataoff
)
115 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
116 int dir
= CTINFO2DIR(ctinfo
);
117 const struct tcphdr
*th
;
126 th
= skb_header_pointer(skb
, protoff
, sizeof(_tcph
), &_tcph
);
130 /* Get TCP data offset */
131 tcpdataoff
= protoff
+ th
->doff
* 4;
133 /* Get TCP data length */
134 tcpdatalen
= skb
->len
- tcpdataoff
;
135 if (tcpdatalen
<= 0) /* No TCP data */
138 if (*data
== NULL
) { /* first TPKT */
139 /* Get first TPKT pointer */
140 tpkt
= skb_header_pointer(skb
, tcpdataoff
, tcpdatalen
,
142 BUG_ON(tpkt
== NULL
);
144 /* Validate TPKT identifier */
145 if (tcpdatalen
< 4 || tpkt
[0] != 0x03 || tpkt
[1] != 0) {
146 /* Netmeeting sends TPKT header and data separately */
147 if (info
->tpkt_len
[dir
] > 0) {
148 pr_debug("nf_ct_h323: previous packet "
149 "indicated separate TPKT data of %hu "
150 "bytes\n", info
->tpkt_len
[dir
]);
151 if (info
->tpkt_len
[dir
] <= tcpdatalen
) {
152 /* Yes, there was a TPKT header
155 *datalen
= info
->tpkt_len
[dir
];
160 /* Fragmented TPKT */
161 pr_debug("nf_ct_h323: fragmented TPKT\n");
165 /* It is not even a TPKT */
169 } else { /* Next TPKT */
170 tpktoff
= *dataoff
+ *datalen
;
171 tcpdatalen
-= tpktoff
;
172 if (tcpdatalen
<= 4) /* No more TPKT */
174 tpkt
= *data
+ *datalen
;
176 /* Validate TPKT identifier */
177 if (tpkt
[0] != 0x03 || tpkt
[1] != 0)
181 /* Validate TPKT length */
182 tpktlen
= tpkt
[2] * 256 + tpkt
[3];
185 if (tpktlen
> tcpdatalen
) {
186 if (tcpdatalen
== 4) { /* Separate TPKT header */
187 /* Netmeeting sends TPKT header and data separately */
188 pr_debug("nf_ct_h323: separate TPKT header indicates "
189 "there will be TPKT data of %hu bytes\n",
191 info
->tpkt_len
[dir
] = tpktlen
- 4;
196 printk("nf_ct_h323: incomplete TPKT (fragmented?)\n");
200 /* This is the encapsulated data */
202 *datalen
= tpktlen
- 4;
203 *dataoff
= tpktoff
+ 4;
206 /* Clear TPKT length */
207 info
->tpkt_len
[dir
] = 0;
211 info
->tpkt_len
[dir
] = 0;
215 /****************************************************************************/
216 static int get_h245_addr(struct nf_conn
*ct
, const unsigned char *data
,
217 H245_TransportAddress
*taddr
,
218 union nf_inet_addr
*addr
, __be16
*port
)
220 const unsigned char *p
;
221 int family
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
;
224 if (taddr
->choice
!= eH245_TransportAddress_unicastAddress
)
227 switch (taddr
->unicastAddress
.choice
) {
228 case eUnicastAddress_iPAddress
:
229 if (family
!= AF_INET
)
231 p
= data
+ taddr
->unicastAddress
.iPAddress
.network
;
234 case eUnicastAddress_iP6Address
:
235 if (family
!= 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
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
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
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
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
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
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 printk("nf_ct_h245: packet dropped\n");
614 /****************************************************************************/
615 static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly
= {
618 .max_expected
= H323_RTP_CHANNEL_MAX
* 4 + 2 /* T.120 */,
620 .tuple
.dst
.protonum
= IPPROTO_UDP
,
624 /****************************************************************************/
625 int get_h225_addr(struct nf_conn
*ct
, unsigned char *data
,
626 TransportAddress
*taddr
,
627 union nf_inet_addr
*addr
, __be16
*port
)
629 const unsigned char *p
;
630 int family
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
;
633 switch (taddr
->choice
) {
634 case eTransportAddress_ipAddress
:
635 if (family
!= AF_INET
)
637 p
= data
+ taddr
->ipAddress
.ip
;
640 case eTransportAddress_ip6Address
:
641 if (family
!= AF_INET6
)
643 p
= data
+ taddr
->ip6Address
.ip
;
650 memcpy(addr
, p
, len
);
651 memset((void *)addr
+ len
, 0, sizeof(*addr
) - len
);
652 memcpy(port
, p
+ len
, sizeof(__be16
));
657 /****************************************************************************/
658 static int expect_h245(struct sk_buff
*skb
, struct nf_conn
*ct
,
659 enum ip_conntrack_info ctinfo
,
660 unsigned char **data
, int dataoff
,
661 TransportAddress
*taddr
)
663 int dir
= CTINFO2DIR(ctinfo
);
666 union nf_inet_addr addr
;
667 struct nf_conntrack_expect
*exp
;
668 typeof(nat_h245_hook
) nat_h245
;
670 /* Read h245Address */
671 if (!get_h225_addr(ct
, *data
, taddr
, &addr
, &port
) ||
672 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) ||
676 /* Create expect for h245 connection */
677 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
679 nf_ct_expect_init(exp
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
680 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
681 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
682 IPPROTO_TCP
, NULL
, &port
);
683 exp
->helper
= &nf_conntrack_helper_h245
;
685 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
686 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
687 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
688 (nat_h245
= rcu_dereference(nat_h245_hook
)) &&
689 ct
->status
& IPS_NAT_MASK
) {
691 ret
= nat_h245(skb
, ct
, ctinfo
, data
, dataoff
, taddr
,
693 } else { /* Conntrack only */
694 if (nf_ct_expect_related(exp
) == 0) {
695 pr_debug("nf_ct_q931: expect H.245 ");
696 NF_CT_DUMP_TUPLE(&exp
->tuple
);
701 nf_ct_expect_put(exp
);
706 /* If the calling party is on the same side of the forward-to party,
707 * we don't need to track the second call */
708 static int callforward_do_filter(const union nf_inet_addr
*src
,
709 const union nf_inet_addr
*dst
, int family
)
711 const struct nf_afinfo
*afinfo
;
712 struct flowi fl1
, fl2
;
715 /* rcu_read_lock()ed by nf_hook_slow() */
716 afinfo
= nf_get_afinfo(family
);
720 memset(&fl1
, 0, sizeof(fl1
));
721 memset(&fl2
, 0, sizeof(fl2
));
725 struct rtable
*rt1
, *rt2
;
727 fl1
.fl4_dst
= src
->ip
;
728 fl2
.fl4_dst
= dst
->ip
;
729 if (!afinfo
->route((struct dst_entry
**)&rt1
, &fl1
)) {
730 if (!afinfo
->route((struct dst_entry
**)&rt2
, &fl2
)) {
731 if (rt1
->rt_gateway
== rt2
->rt_gateway
&&
732 rt1
->u
.dst
.dev
== rt2
->u
.dst
.dev
)
734 dst_release(&rt2
->u
.dst
);
736 dst_release(&rt1
->u
.dst
);
740 #if defined(CONFIG_NF_CONNTRACK_IPV6) || \
741 defined(CONFIG_NF_CONNTRACK_IPV6_MODULE)
743 struct rt6_info
*rt1
, *rt2
;
745 memcpy(&fl1
.fl6_dst
, src
, sizeof(fl1
.fl6_dst
));
746 memcpy(&fl2
.fl6_dst
, dst
, sizeof(fl2
.fl6_dst
));
747 if (!afinfo
->route((struct dst_entry
**)&rt1
, &fl1
)) {
748 if (!afinfo
->route((struct dst_entry
**)&rt2
, &fl2
)) {
749 if (!memcmp(&rt1
->rt6i_gateway
, &rt2
->rt6i_gateway
,
750 sizeof(rt1
->rt6i_gateway
)) &&
751 rt1
->u
.dst
.dev
== rt2
->u
.dst
.dev
)
753 dst_release(&rt2
->u
.dst
);
755 dst_release(&rt1
->u
.dst
);
765 /****************************************************************************/
766 static int expect_callforwarding(struct sk_buff
*skb
,
768 enum ip_conntrack_info ctinfo
,
769 unsigned char **data
, int dataoff
,
770 TransportAddress
*taddr
)
772 int dir
= CTINFO2DIR(ctinfo
);
775 union nf_inet_addr addr
;
776 struct nf_conntrack_expect
*exp
;
777 typeof(nat_callforwarding_hook
) nat_callforwarding
;
779 /* Read alternativeAddress */
780 if (!get_h225_addr(ct
, *data
, taddr
, &addr
, &port
) || port
== 0)
783 /* If the calling party is on the same side of the forward-to party,
784 * we don't need to track the second call */
785 if (callforward_filter
&&
786 callforward_do_filter(&addr
, &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
787 ct
->tuplehash
[!dir
].tuple
.src
.l3num
)) {
788 pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
792 /* Create expect for the second call leg */
793 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
795 nf_ct_expect_init(exp
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
796 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
797 IPPROTO_TCP
, NULL
, &port
);
798 exp
->helper
= nf_conntrack_helper_q931
;
800 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
801 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
802 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
803 (nat_callforwarding
= rcu_dereference(nat_callforwarding_hook
)) &&
804 ct
->status
& IPS_NAT_MASK
) {
806 ret
= nat_callforwarding(skb
, ct
, ctinfo
, data
, dataoff
,
808 } else { /* Conntrack only */
809 if (nf_ct_expect_related(exp
) == 0) {
810 pr_debug("nf_ct_q931: expect Call Forwarding ");
811 NF_CT_DUMP_TUPLE(&exp
->tuple
);
816 nf_ct_expect_put(exp
);
821 /****************************************************************************/
822 static int process_setup(struct sk_buff
*skb
, struct nf_conn
*ct
,
823 enum ip_conntrack_info ctinfo
,
824 unsigned char **data
, int dataoff
,
827 int dir
= CTINFO2DIR(ctinfo
);
831 union nf_inet_addr addr
;
832 typeof(set_h225_addr_hook
) set_h225_addr
;
834 pr_debug("nf_ct_q931: Setup\n");
836 if (setup
->options
& eSetup_UUIE_h245Address
) {
837 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
838 &setup
->h245Address
);
843 set_h225_addr
= rcu_dereference(set_h225_addr_hook
);
844 if ((setup
->options
& eSetup_UUIE_destCallSignalAddress
) &&
845 (set_h225_addr
) && ct
->status
&& IPS_NAT_MASK
&&
846 get_h225_addr(ct
, *data
, &setup
->destCallSignalAddress
,
848 memcmp(&addr
, &ct
->tuplehash
[!dir
].tuple
.src
.u3
, sizeof(addr
))) {
849 pr_debug("nf_ct_q931: set destCallSignalAddress "
850 NIP6_FMT
":%hu->" NIP6_FMT
":%hu\n",
851 NIP6(*(struct in6_addr
*)&addr
), ntohs(port
),
852 NIP6(*(struct in6_addr
*)&ct
->tuplehash
[!dir
].tuple
.src
.u3
),
853 ntohs(ct
->tuplehash
[!dir
].tuple
.src
.u
.tcp
.port
));
854 ret
= set_h225_addr(skb
, data
, dataoff
,
855 &setup
->destCallSignalAddress
,
856 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
857 ct
->tuplehash
[!dir
].tuple
.src
.u
.tcp
.port
);
862 if ((setup
->options
& eSetup_UUIE_sourceCallSignalAddress
) &&
863 (set_h225_addr
) && ct
->status
& IPS_NAT_MASK
&&
864 get_h225_addr(ct
, *data
, &setup
->sourceCallSignalAddress
,
866 memcmp(&addr
, &ct
->tuplehash
[!dir
].tuple
.dst
.u3
, sizeof(addr
))) {
867 pr_debug("nf_ct_q931: set sourceCallSignalAddress "
868 NIP6_FMT
":%hu->" NIP6_FMT
":%hu\n",
869 NIP6(*(struct in6_addr
*)&addr
), ntohs(port
),
870 NIP6(*(struct in6_addr
*)&ct
->tuplehash
[!dir
].tuple
.dst
.u3
),
871 ntohs(ct
->tuplehash
[!dir
].tuple
.dst
.u
.tcp
.port
));
872 ret
= set_h225_addr(skb
, data
, dataoff
,
873 &setup
->sourceCallSignalAddress
,
874 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
875 ct
->tuplehash
[!dir
].tuple
.dst
.u
.tcp
.port
);
880 if (setup
->options
& eSetup_UUIE_fastStart
) {
881 for (i
= 0; i
< setup
->fastStart
.count
; i
++) {
882 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
883 &setup
->fastStart
.item
[i
]);
892 /****************************************************************************/
893 static int process_callproceeding(struct sk_buff
*skb
,
895 enum ip_conntrack_info ctinfo
,
896 unsigned char **data
, int dataoff
,
897 CallProceeding_UUIE
*callproc
)
902 pr_debug("nf_ct_q931: CallProceeding\n");
904 if (callproc
->options
& eCallProceeding_UUIE_h245Address
) {
905 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
906 &callproc
->h245Address
);
911 if (callproc
->options
& eCallProceeding_UUIE_fastStart
) {
912 for (i
= 0; i
< callproc
->fastStart
.count
; i
++) {
913 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
914 &callproc
->fastStart
.item
[i
]);
923 /****************************************************************************/
924 static int process_connect(struct sk_buff
*skb
, struct nf_conn
*ct
,
925 enum ip_conntrack_info ctinfo
,
926 unsigned char **data
, int dataoff
,
927 Connect_UUIE
*connect
)
932 pr_debug("nf_ct_q931: Connect\n");
934 if (connect
->options
& eConnect_UUIE_h245Address
) {
935 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
936 &connect
->h245Address
);
941 if (connect
->options
& eConnect_UUIE_fastStart
) {
942 for (i
= 0; i
< connect
->fastStart
.count
; i
++) {
943 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
944 &connect
->fastStart
.item
[i
]);
953 /****************************************************************************/
954 static int process_alerting(struct sk_buff
*skb
, struct nf_conn
*ct
,
955 enum ip_conntrack_info ctinfo
,
956 unsigned char **data
, int dataoff
,
957 Alerting_UUIE
*alert
)
962 pr_debug("nf_ct_q931: Alerting\n");
964 if (alert
->options
& eAlerting_UUIE_h245Address
) {
965 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
966 &alert
->h245Address
);
971 if (alert
->options
& eAlerting_UUIE_fastStart
) {
972 for (i
= 0; i
< alert
->fastStart
.count
; i
++) {
973 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
974 &alert
->fastStart
.item
[i
]);
983 /****************************************************************************/
984 static int process_facility(struct sk_buff
*skb
, struct nf_conn
*ct
,
985 enum ip_conntrack_info ctinfo
,
986 unsigned char **data
, int dataoff
,
987 Facility_UUIE
*facility
)
992 pr_debug("nf_ct_q931: Facility\n");
994 if (facility
->reason
.choice
== eFacilityReason_callForwarded
) {
995 if (facility
->options
& eFacility_UUIE_alternativeAddress
)
996 return expect_callforwarding(skb
, ct
, ctinfo
, data
,
1003 if (facility
->options
& eFacility_UUIE_h245Address
) {
1004 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
1005 &facility
->h245Address
);
1010 if (facility
->options
& eFacility_UUIE_fastStart
) {
1011 for (i
= 0; i
< facility
->fastStart
.count
; i
++) {
1012 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
1013 &facility
->fastStart
.item
[i
]);
1022 /****************************************************************************/
1023 static int process_progress(struct sk_buff
*skb
, struct nf_conn
*ct
,
1024 enum ip_conntrack_info ctinfo
,
1025 unsigned char **data
, int dataoff
,
1026 Progress_UUIE
*progress
)
1031 pr_debug("nf_ct_q931: Progress\n");
1033 if (progress
->options
& eProgress_UUIE_h245Address
) {
1034 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
1035 &progress
->h245Address
);
1040 if (progress
->options
& eProgress_UUIE_fastStart
) {
1041 for (i
= 0; i
< progress
->fastStart
.count
; i
++) {
1042 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
1043 &progress
->fastStart
.item
[i
]);
1052 /****************************************************************************/
1053 static int process_q931(struct sk_buff
*skb
, struct nf_conn
*ct
,
1054 enum ip_conntrack_info ctinfo
,
1055 unsigned char **data
, int dataoff
, Q931
*q931
)
1057 H323_UU_PDU
*pdu
= &q931
->UUIE
.h323_uu_pdu
;
1061 switch (pdu
->h323_message_body
.choice
) {
1062 case eH323_UU_PDU_h323_message_body_setup
:
1063 ret
= process_setup(skb
, ct
, ctinfo
, data
, dataoff
,
1064 &pdu
->h323_message_body
.setup
);
1066 case eH323_UU_PDU_h323_message_body_callProceeding
:
1067 ret
= process_callproceeding(skb
, ct
, ctinfo
, data
, dataoff
,
1068 &pdu
->h323_message_body
.
1071 case eH323_UU_PDU_h323_message_body_connect
:
1072 ret
= process_connect(skb
, ct
, ctinfo
, data
, dataoff
,
1073 &pdu
->h323_message_body
.connect
);
1075 case eH323_UU_PDU_h323_message_body_alerting
:
1076 ret
= process_alerting(skb
, ct
, ctinfo
, data
, dataoff
,
1077 &pdu
->h323_message_body
.alerting
);
1079 case eH323_UU_PDU_h323_message_body_facility
:
1080 ret
= process_facility(skb
, ct
, ctinfo
, data
, dataoff
,
1081 &pdu
->h323_message_body
.facility
);
1083 case eH323_UU_PDU_h323_message_body_progress
:
1084 ret
= process_progress(skb
, ct
, ctinfo
, data
, dataoff
,
1085 &pdu
->h323_message_body
.progress
);
1088 pr_debug("nf_ct_q931: Q.931 signal %d\n",
1089 pdu
->h323_message_body
.choice
);
1096 if (pdu
->options
& eH323_UU_PDU_h245Control
) {
1097 for (i
= 0; i
< pdu
->h245Control
.count
; i
++) {
1098 ret
= process_h245(skb
, ct
, ctinfo
, data
, dataoff
,
1099 &pdu
->h245Control
.item
[i
]);
1108 /****************************************************************************/
1109 static int q931_help(struct sk_buff
*skb
, unsigned int protoff
,
1110 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
1113 unsigned char *data
= NULL
;
1118 /* Until there's been traffic both ways, don't look in packets. */
1119 if (ctinfo
!= IP_CT_ESTABLISHED
&&
1120 ctinfo
!= IP_CT_ESTABLISHED
+ IP_CT_IS_REPLY
) {
1123 pr_debug("nf_ct_q931: skblen = %u\n", skb
->len
);
1125 spin_lock_bh(&nf_h323_lock
);
1127 /* Process each TPKT */
1128 while (get_tpkt_data(skb
, protoff
, ct
, ctinfo
,
1129 &data
, &datalen
, &dataoff
)) {
1130 pr_debug("nf_ct_q931: TPKT len=%d ", datalen
);
1131 NF_CT_DUMP_TUPLE(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
1133 /* Decode Q.931 signal */
1134 ret
= DecodeQ931(data
, datalen
, &q931
);
1136 pr_debug("nf_ct_q931: decoding error: %s\n",
1137 ret
== H323_ERROR_BOUND
?
1138 "out of bound" : "out of range");
1139 /* We don't drop when decoding error */
1143 /* Process Q.931 signal */
1144 if (process_q931(skb
, ct
, ctinfo
, &data
, dataoff
, &q931
) < 0)
1148 spin_unlock_bh(&nf_h323_lock
);
1152 spin_unlock_bh(&nf_h323_lock
);
1153 if (net_ratelimit())
1154 printk("nf_ct_q931: packet dropped\n");
1158 /****************************************************************************/
1159 static struct nf_conntrack_helper nf_conntrack_helper_q931
[] __read_mostly
= {
1163 /* T.120 and H.245 */
1164 .max_expected
= H323_RTP_CHANNEL_MAX
* 4 + 4,
1166 .tuple
.src
.l3num
= AF_INET
,
1167 .tuple
.src
.u
.tcp
.port
= __constant_htons(Q931_PORT
),
1168 .tuple
.dst
.protonum
= IPPROTO_TCP
,
1174 /* T.120 and H.245 */
1175 .max_expected
= H323_RTP_CHANNEL_MAX
* 4 + 4,
1177 .tuple
.src
.l3num
= AF_INET6
,
1178 .tuple
.src
.u
.tcp
.port
= __constant_htons(Q931_PORT
),
1179 .tuple
.dst
.protonum
= IPPROTO_TCP
,
1184 /****************************************************************************/
1185 static unsigned char *get_udp_data(struct sk_buff
*skb
, unsigned int protoff
,
1188 const struct udphdr
*uh
;
1192 uh
= skb_header_pointer(skb
, protoff
, sizeof(_uh
), &_uh
);
1195 dataoff
= protoff
+ sizeof(_uh
);
1196 if (dataoff
>= skb
->len
)
1198 *datalen
= skb
->len
- dataoff
;
1199 return skb_header_pointer(skb
, dataoff
, *datalen
, h323_buffer
);
1202 /****************************************************************************/
1203 static struct nf_conntrack_expect
*find_expect(struct nf_conn
*ct
,
1204 union nf_inet_addr
*addr
,
1207 struct nf_conntrack_expect
*exp
;
1208 struct nf_conntrack_tuple tuple
;
1210 memset(&tuple
.src
.u3
, 0, sizeof(tuple
.src
.u3
));
1211 tuple
.src
.u
.tcp
.port
= 0;
1212 memcpy(&tuple
.dst
.u3
, addr
, sizeof(tuple
.dst
.u3
));
1213 tuple
.dst
.u
.tcp
.port
= port
;
1214 tuple
.dst
.protonum
= IPPROTO_TCP
;
1216 exp
= __nf_ct_expect_find(&tuple
);
1217 if (exp
&& exp
->master
== ct
)
1222 /****************************************************************************/
1223 static int set_expect_timeout(struct nf_conntrack_expect
*exp
,
1226 if (!exp
|| !del_timer(&exp
->timeout
))
1229 exp
->timeout
.expires
= jiffies
+ timeout
* HZ
;
1230 add_timer(&exp
->timeout
);
1235 /****************************************************************************/
1236 static int expect_q931(struct sk_buff
*skb
, struct nf_conn
*ct
,
1237 enum ip_conntrack_info ctinfo
,
1238 unsigned char **data
,
1239 TransportAddress
*taddr
, int count
)
1241 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1242 int dir
= CTINFO2DIR(ctinfo
);
1246 union nf_inet_addr addr
;
1247 struct nf_conntrack_expect
*exp
;
1248 typeof(nat_q931_hook
) nat_q931
;
1250 /* Look for the first related address */
1251 for (i
= 0; i
< count
; i
++) {
1252 if (get_h225_addr(ct
, *data
, &taddr
[i
], &addr
, &port
) &&
1253 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
,
1254 sizeof(addr
)) == 0 && port
!= 0)
1258 if (i
>= count
) /* Not found */
1261 /* Create expect for Q.931 */
1262 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1264 nf_ct_expect_init(exp
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
1265 gkrouted_only
? /* only accept calls from GK? */
1266 &ct
->tuplehash
[!dir
].tuple
.src
.u3
: NULL
,
1267 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1268 IPPROTO_TCP
, NULL
, &port
);
1269 exp
->helper
= nf_conntrack_helper_q931
;
1270 exp
->flags
= NF_CT_EXPECT_PERMANENT
; /* Accept multiple calls */
1272 nat_q931
= rcu_dereference(nat_q931_hook
);
1273 if (nat_q931
&& ct
->status
& IPS_NAT_MASK
) { /* Need NAT */
1274 ret
= nat_q931(skb
, ct
, ctinfo
, data
, taddr
, i
, port
, exp
);
1275 } else { /* Conntrack only */
1276 if (nf_ct_expect_related(exp
) == 0) {
1277 pr_debug("nf_ct_ras: expect Q.931 ");
1278 NF_CT_DUMP_TUPLE(&exp
->tuple
);
1280 /* Save port for looking up expect in processing RCF */
1281 info
->sig_port
[dir
] = port
;
1286 nf_ct_expect_put(exp
);
1291 /****************************************************************************/
1292 static int process_grq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1293 enum ip_conntrack_info ctinfo
,
1294 unsigned char **data
, GatekeeperRequest
*grq
)
1296 typeof(set_ras_addr_hook
) set_ras_addr
;
1298 pr_debug("nf_ct_ras: GRQ\n");
1300 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1301 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) /* NATed */
1302 return set_ras_addr(skb
, ct
, ctinfo
, data
,
1303 &grq
->rasAddress
, 1);
1307 /****************************************************************************/
1308 static int process_gcf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1309 enum ip_conntrack_info ctinfo
,
1310 unsigned char **data
, GatekeeperConfirm
*gcf
)
1312 int dir
= CTINFO2DIR(ctinfo
);
1315 union nf_inet_addr addr
;
1316 struct nf_conntrack_expect
*exp
;
1318 pr_debug("nf_ct_ras: GCF\n");
1320 if (!get_h225_addr(ct
, *data
, &gcf
->rasAddress
, &addr
, &port
))
1323 /* Registration port is the same as discovery port */
1324 if (!memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1325 port
== ct
->tuplehash
[dir
].tuple
.src
.u
.udp
.port
)
1328 /* Avoid RAS expectation loops. A GCF is never expected. */
1329 if (test_bit(IPS_EXPECTED_BIT
, &ct
->status
))
1332 /* Need new expect */
1333 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1335 nf_ct_expect_init(exp
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
1336 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1337 IPPROTO_UDP
, NULL
, &port
);
1338 exp
->helper
= nf_conntrack_helper_ras
;
1340 if (nf_ct_expect_related(exp
) == 0) {
1341 pr_debug("nf_ct_ras: expect RAS ");
1342 NF_CT_DUMP_TUPLE(&exp
->tuple
);
1346 nf_ct_expect_put(exp
);
1351 /****************************************************************************/
1352 static int process_rrq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1353 enum ip_conntrack_info ctinfo
,
1354 unsigned char **data
, RegistrationRequest
*rrq
)
1356 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1358 typeof(set_ras_addr_hook
) set_ras_addr
;
1360 pr_debug("nf_ct_ras: RRQ\n");
1362 ret
= expect_q931(skb
, ct
, ctinfo
, data
,
1363 rrq
->callSignalAddress
.item
,
1364 rrq
->callSignalAddress
.count
);
1368 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1369 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) {
1370 ret
= set_ras_addr(skb
, ct
, ctinfo
, data
,
1371 rrq
->rasAddress
.item
,
1372 rrq
->rasAddress
.count
);
1377 if (rrq
->options
& eRegistrationRequest_timeToLive
) {
1378 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq
->timeToLive
);
1379 info
->timeout
= rrq
->timeToLive
;
1381 info
->timeout
= default_rrq_ttl
;
1386 /****************************************************************************/
1387 static int process_rcf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1388 enum ip_conntrack_info ctinfo
,
1389 unsigned char **data
, RegistrationConfirm
*rcf
)
1391 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1392 int dir
= CTINFO2DIR(ctinfo
);
1394 struct nf_conntrack_expect
*exp
;
1395 typeof(set_sig_addr_hook
) set_sig_addr
;
1397 pr_debug("nf_ct_ras: RCF\n");
1399 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1400 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1401 ret
= set_sig_addr(skb
, ct
, ctinfo
, data
,
1402 rcf
->callSignalAddress
.item
,
1403 rcf
->callSignalAddress
.count
);
1408 if (rcf
->options
& eRegistrationConfirm_timeToLive
) {
1409 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf
->timeToLive
);
1410 info
->timeout
= rcf
->timeToLive
;
1413 if (info
->timeout
> 0) {
1414 pr_debug("nf_ct_ras: set RAS connection timeout to "
1415 "%u seconds\n", info
->timeout
);
1416 nf_ct_refresh(ct
, skb
, info
->timeout
* HZ
);
1418 /* Set expect timeout */
1419 spin_lock_bh(&nf_conntrack_lock
);
1420 exp
= find_expect(ct
, &ct
->tuplehash
[dir
].tuple
.dst
.u3
,
1421 info
->sig_port
[!dir
]);
1423 pr_debug("nf_ct_ras: set Q.931 expect "
1424 "timeout to %u seconds for",
1426 NF_CT_DUMP_TUPLE(&exp
->tuple
);
1427 set_expect_timeout(exp
, info
->timeout
);
1429 spin_unlock_bh(&nf_conntrack_lock
);
1435 /****************************************************************************/
1436 static int process_urq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1437 enum ip_conntrack_info ctinfo
,
1438 unsigned char **data
, UnregistrationRequest
*urq
)
1440 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1441 int dir
= CTINFO2DIR(ctinfo
);
1443 typeof(set_sig_addr_hook
) set_sig_addr
;
1445 pr_debug("nf_ct_ras: URQ\n");
1447 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1448 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1449 ret
= set_sig_addr(skb
, ct
, ctinfo
, data
,
1450 urq
->callSignalAddress
.item
,
1451 urq
->callSignalAddress
.count
);
1456 /* Clear old expect */
1457 nf_ct_remove_expectations(ct
);
1458 info
->sig_port
[dir
] = 0;
1459 info
->sig_port
[!dir
] = 0;
1461 /* Give it 30 seconds for UCF or URJ */
1462 nf_ct_refresh(ct
, skb
, 30 * HZ
);
1467 /****************************************************************************/
1468 static int process_arq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1469 enum ip_conntrack_info ctinfo
,
1470 unsigned char **data
, AdmissionRequest
*arq
)
1472 const struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1473 int dir
= CTINFO2DIR(ctinfo
);
1475 union nf_inet_addr addr
;
1476 typeof(set_h225_addr_hook
) set_h225_addr
;
1478 pr_debug("nf_ct_ras: ARQ\n");
1480 set_h225_addr
= rcu_dereference(set_h225_addr_hook
);
1481 if ((arq
->options
& eAdmissionRequest_destCallSignalAddress
) &&
1482 get_h225_addr(ct
, *data
, &arq
->destCallSignalAddress
,
1484 !memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1485 port
== info
->sig_port
[dir
] &&
1486 set_h225_addr
&& ct
->status
& IPS_NAT_MASK
) {
1488 return set_h225_addr(skb
, data
, 0,
1489 &arq
->destCallSignalAddress
,
1490 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1491 info
->sig_port
[!dir
]);
1494 if ((arq
->options
& eAdmissionRequest_srcCallSignalAddress
) &&
1495 get_h225_addr(ct
, *data
, &arq
->srcCallSignalAddress
,
1497 !memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1498 set_h225_addr
&& ct
->status
& IPS_NAT_MASK
) {
1500 return set_h225_addr(skb
, data
, 0,
1501 &arq
->srcCallSignalAddress
,
1502 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1509 /****************************************************************************/
1510 static int process_acf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1511 enum ip_conntrack_info ctinfo
,
1512 unsigned char **data
, AdmissionConfirm
*acf
)
1514 int dir
= CTINFO2DIR(ctinfo
);
1517 union nf_inet_addr addr
;
1518 struct nf_conntrack_expect
*exp
;
1519 typeof(set_sig_addr_hook
) set_sig_addr
;
1521 pr_debug("nf_ct_ras: ACF\n");
1523 if (!get_h225_addr(ct
, *data
, &acf
->destCallSignalAddress
,
1527 if (!memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.dst
.u3
, sizeof(addr
))) {
1529 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1530 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
)
1531 return set_sig_addr(skb
, ct
, ctinfo
, data
,
1532 &acf
->destCallSignalAddress
, 1);
1536 /* Need new expect */
1537 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1539 nf_ct_expect_init(exp
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
1540 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1541 IPPROTO_TCP
, NULL
, &port
);
1542 exp
->flags
= NF_CT_EXPECT_PERMANENT
;
1543 exp
->helper
= nf_conntrack_helper_q931
;
1545 if (nf_ct_expect_related(exp
) == 0) {
1546 pr_debug("nf_ct_ras: expect Q.931 ");
1547 NF_CT_DUMP_TUPLE(&exp
->tuple
);
1551 nf_ct_expect_put(exp
);
1556 /****************************************************************************/
1557 static int process_lrq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1558 enum ip_conntrack_info ctinfo
,
1559 unsigned char **data
, LocationRequest
*lrq
)
1561 typeof(set_ras_addr_hook
) set_ras_addr
;
1563 pr_debug("nf_ct_ras: LRQ\n");
1565 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1566 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
)
1567 return set_ras_addr(skb
, ct
, ctinfo
, data
,
1568 &lrq
->replyAddress
, 1);
1572 /****************************************************************************/
1573 static int process_lcf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1574 enum ip_conntrack_info ctinfo
,
1575 unsigned char **data
, LocationConfirm
*lcf
)
1577 int dir
= CTINFO2DIR(ctinfo
);
1580 union nf_inet_addr addr
;
1581 struct nf_conntrack_expect
*exp
;
1583 pr_debug("nf_ct_ras: LCF\n");
1585 if (!get_h225_addr(ct
, *data
, &lcf
->callSignalAddress
,
1589 /* Need new expect for call signal */
1590 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1592 nf_ct_expect_init(exp
, ct
->tuplehash
[!dir
].tuple
.src
.l3num
,
1593 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1594 IPPROTO_TCP
, NULL
, &port
);
1595 exp
->flags
= NF_CT_EXPECT_PERMANENT
;
1596 exp
->helper
= nf_conntrack_helper_q931
;
1598 if (nf_ct_expect_related(exp
) == 0) {
1599 pr_debug("nf_ct_ras: expect Q.931 ");
1600 NF_CT_DUMP_TUPLE(&exp
->tuple
);
1604 nf_ct_expect_put(exp
);
1606 /* Ignore rasAddress */
1611 /****************************************************************************/
1612 static int process_irr(struct sk_buff
*skb
, struct nf_conn
*ct
,
1613 enum ip_conntrack_info ctinfo
,
1614 unsigned char **data
, InfoRequestResponse
*irr
)
1617 typeof(set_ras_addr_hook
) set_ras_addr
;
1618 typeof(set_sig_addr_hook
) set_sig_addr
;
1620 pr_debug("nf_ct_ras: IRR\n");
1622 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1623 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) {
1624 ret
= set_ras_addr(skb
, ct
, ctinfo
, data
,
1625 &irr
->rasAddress
, 1);
1630 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1631 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1632 ret
= set_sig_addr(skb
, ct
, ctinfo
, data
,
1633 irr
->callSignalAddress
.item
,
1634 irr
->callSignalAddress
.count
);
1642 /****************************************************************************/
1643 static int process_ras(struct sk_buff
*skb
, struct nf_conn
*ct
,
1644 enum ip_conntrack_info ctinfo
,
1645 unsigned char **data
, RasMessage
*ras
)
1647 switch (ras
->choice
) {
1648 case eRasMessage_gatekeeperRequest
:
1649 return process_grq(skb
, ct
, ctinfo
, data
,
1650 &ras
->gatekeeperRequest
);
1651 case eRasMessage_gatekeeperConfirm
:
1652 return process_gcf(skb
, ct
, ctinfo
, data
,
1653 &ras
->gatekeeperConfirm
);
1654 case eRasMessage_registrationRequest
:
1655 return process_rrq(skb
, ct
, ctinfo
, data
,
1656 &ras
->registrationRequest
);
1657 case eRasMessage_registrationConfirm
:
1658 return process_rcf(skb
, ct
, ctinfo
, data
,
1659 &ras
->registrationConfirm
);
1660 case eRasMessage_unregistrationRequest
:
1661 return process_urq(skb
, ct
, ctinfo
, data
,
1662 &ras
->unregistrationRequest
);
1663 case eRasMessage_admissionRequest
:
1664 return process_arq(skb
, ct
, ctinfo
, data
,
1665 &ras
->admissionRequest
);
1666 case eRasMessage_admissionConfirm
:
1667 return process_acf(skb
, ct
, ctinfo
, data
,
1668 &ras
->admissionConfirm
);
1669 case eRasMessage_locationRequest
:
1670 return process_lrq(skb
, ct
, ctinfo
, data
,
1671 &ras
->locationRequest
);
1672 case eRasMessage_locationConfirm
:
1673 return process_lcf(skb
, ct
, ctinfo
, data
,
1674 &ras
->locationConfirm
);
1675 case eRasMessage_infoRequestResponse
:
1676 return process_irr(skb
, ct
, ctinfo
, data
,
1677 &ras
->infoRequestResponse
);
1679 pr_debug("nf_ct_ras: RAS message %d\n", ras
->choice
);
1686 /****************************************************************************/
1687 static int ras_help(struct sk_buff
*skb
, unsigned int protoff
,
1688 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
1690 static RasMessage ras
;
1691 unsigned char *data
;
1695 pr_debug("nf_ct_ras: skblen = %u\n", skb
->len
);
1697 spin_lock_bh(&nf_h323_lock
);
1700 data
= get_udp_data(skb
, protoff
, &datalen
);
1703 pr_debug("nf_ct_ras: RAS message len=%d ", datalen
);
1704 NF_CT_DUMP_TUPLE(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
1706 /* Decode RAS message */
1707 ret
= DecodeRasMessage(data
, datalen
, &ras
);
1709 pr_debug("nf_ct_ras: decoding error: %s\n",
1710 ret
== H323_ERROR_BOUND
?
1711 "out of bound" : "out of range");
1715 /* Process RAS message */
1716 if (process_ras(skb
, ct
, ctinfo
, &data
, &ras
) < 0)
1720 spin_unlock_bh(&nf_h323_lock
);
1724 spin_unlock_bh(&nf_h323_lock
);
1725 if (net_ratelimit())
1726 printk("nf_ct_ras: packet dropped\n");
1730 /****************************************************************************/
1731 static struct nf_conntrack_helper nf_conntrack_helper_ras
[] __read_mostly
= {
1737 .tuple
.src
.l3num
= AF_INET
,
1738 .tuple
.src
.u
.udp
.port
= __constant_htons(RAS_PORT
),
1739 .tuple
.dst
.protonum
= IPPROTO_UDP
,
1747 .tuple
.src
.l3num
= AF_INET6
,
1748 .tuple
.src
.u
.udp
.port
= __constant_htons(RAS_PORT
),
1749 .tuple
.dst
.protonum
= IPPROTO_UDP
,
1754 /****************************************************************************/
1755 static void __exit
nf_conntrack_h323_fini(void)
1757 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[1]);
1758 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[0]);
1759 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[1]);
1760 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[0]);
1762 pr_debug("nf_ct_h323: fini\n");
1765 /****************************************************************************/
1766 static int __init
nf_conntrack_h323_init(void)
1770 h323_buffer
= kmalloc(65536, GFP_KERNEL
);
1773 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_q931
[0]);
1776 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_q931
[1]);
1779 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_ras
[0]);
1782 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_ras
[1]);
1785 pr_debug("nf_ct_h323: init success\n");
1789 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[0]);
1791 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[1]);
1793 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[0]);
1798 /****************************************************************************/
1799 module_init(nf_conntrack_h323_init
);
1800 module_exit(nf_conntrack_h323_fini
);
1802 EXPORT_SYMBOL_GPL(get_h225_addr
);
1803 EXPORT_SYMBOL_GPL(set_h245_addr_hook
);
1804 EXPORT_SYMBOL_GPL(set_h225_addr_hook
);
1805 EXPORT_SYMBOL_GPL(set_sig_addr_hook
);
1806 EXPORT_SYMBOL_GPL(set_ras_addr_hook
);
1807 EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook
);
1808 EXPORT_SYMBOL_GPL(nat_t120_hook
);
1809 EXPORT_SYMBOL_GPL(nat_h245_hook
);
1810 EXPORT_SYMBOL_GPL(nat_callforwarding_hook
);
1811 EXPORT_SYMBOL_GPL(nat_q931_hook
);
1813 MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1814 MODULE_DESCRIPTION("H.323 connection tracking helper");
1815 MODULE_LICENSE("GPL");
1816 MODULE_ALIAS("ip_conntrack_h323");