2 * H.323 connection tracking helper
4 * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net>
6 * This source code is licensed under General Public License version 2.
8 * Based on the 'brute force' H.323 connection tracking module by
9 * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
11 * For more information, please see http://nath323.sourceforge.net/
14 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/ctype.h>
17 #include <linux/inet.h>
20 #include <linux/slab.h>
21 #include <linux/udp.h>
22 #include <linux/tcp.h>
23 #include <linux/skbuff.h>
24 #include <net/route.h>
25 #include <net/ip6_route.h>
27 #include <net/netfilter/nf_conntrack.h>
28 #include <net/netfilter/nf_conntrack_core.h>
29 #include <net/netfilter/nf_conntrack_tuple.h>
30 #include <net/netfilter/nf_conntrack_expect.h>
31 #include <net/netfilter/nf_conntrack_ecache.h>
32 #include <net/netfilter/nf_conntrack_helper.h>
33 #include <net/netfilter/nf_conntrack_zones.h>
34 #include <linux/netfilter/nf_conntrack_h323.h>
37 static unsigned int default_rrq_ttl __read_mostly
= 300;
38 module_param(default_rrq_ttl
, uint
, 0600);
39 MODULE_PARM_DESC(default_rrq_ttl
, "use this TTL if it's missing in RRQ");
41 static int gkrouted_only __read_mostly
= 1;
42 module_param(gkrouted_only
, int, 0600);
43 MODULE_PARM_DESC(gkrouted_only
, "only accept calls from gatekeeper");
45 static bool callforward_filter __read_mostly
= true;
46 module_param(callforward_filter
, bool, 0600);
47 MODULE_PARM_DESC(callforward_filter
, "only create call forwarding expectations "
48 "if both endpoints are on different sides "
49 "(determined by routing information)");
52 int (*set_h245_addr_hook
) (struct sk_buff
*skb
,
53 unsigned char **data
, int dataoff
,
54 H245_TransportAddress
*taddr
,
55 union nf_inet_addr
*addr
, __be16 port
)
57 int (*set_h225_addr_hook
) (struct sk_buff
*skb
,
58 unsigned char **data
, int dataoff
,
59 TransportAddress
*taddr
,
60 union nf_inet_addr
*addr
, __be16 port
)
62 int (*set_sig_addr_hook
) (struct sk_buff
*skb
,
64 enum ip_conntrack_info ctinfo
,
66 TransportAddress
*taddr
, int count
) __read_mostly
;
67 int (*set_ras_addr_hook
) (struct sk_buff
*skb
,
69 enum ip_conntrack_info ctinfo
,
71 TransportAddress
*taddr
, int count
) __read_mostly
;
72 int (*nat_rtp_rtcp_hook
) (struct sk_buff
*skb
,
74 enum ip_conntrack_info ctinfo
,
75 unsigned char **data
, int dataoff
,
76 H245_TransportAddress
*taddr
,
77 __be16 port
, __be16 rtp_port
,
78 struct nf_conntrack_expect
*rtp_exp
,
79 struct nf_conntrack_expect
*rtcp_exp
) __read_mostly
;
80 int (*nat_t120_hook
) (struct sk_buff
*skb
,
82 enum ip_conntrack_info ctinfo
,
83 unsigned char **data
, int dataoff
,
84 H245_TransportAddress
*taddr
, __be16 port
,
85 struct nf_conntrack_expect
*exp
) __read_mostly
;
86 int (*nat_h245_hook
) (struct sk_buff
*skb
,
88 enum ip_conntrack_info ctinfo
,
89 unsigned char **data
, int dataoff
,
90 TransportAddress
*taddr
, __be16 port
,
91 struct nf_conntrack_expect
*exp
) __read_mostly
;
92 int (*nat_callforwarding_hook
) (struct sk_buff
*skb
,
94 enum ip_conntrack_info ctinfo
,
95 unsigned char **data
, int dataoff
,
96 TransportAddress
*taddr
, __be16 port
,
97 struct nf_conntrack_expect
*exp
) __read_mostly
;
98 int (*nat_q931_hook
) (struct sk_buff
*skb
,
100 enum ip_conntrack_info ctinfo
,
101 unsigned char **data
, TransportAddress
*taddr
, int idx
,
102 __be16 port
, struct nf_conntrack_expect
*exp
)
105 static DEFINE_SPINLOCK(nf_h323_lock
);
106 static char *h323_buffer
;
108 static struct nf_conntrack_helper nf_conntrack_helper_h245
;
109 static struct nf_conntrack_helper nf_conntrack_helper_q931
[];
110 static struct nf_conntrack_helper nf_conntrack_helper_ras
[];
112 /****************************************************************************/
113 static int get_tpkt_data(struct sk_buff
*skb
, unsigned int protoff
,
114 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
,
115 unsigned char **data
, int *datalen
, int *dataoff
)
117 struct nf_ct_h323_master
*info
= &nfct_help(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
&& ctinfo
!= IP_CT_ESTABLISHED_REPLY
)
577 pr_debug("nf_ct_h245: skblen = %u\n", skb
->len
);
579 spin_lock_bh(&nf_h323_lock
);
581 /* Process each TPKT */
582 while (get_tpkt_data(skb
, protoff
, ct
, ctinfo
,
583 &data
, &datalen
, &dataoff
)) {
584 pr_debug("nf_ct_h245: TPKT len=%d ", datalen
);
585 nf_ct_dump_tuple(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
587 /* Decode H.245 signal */
588 ret
= DecodeMultimediaSystemControlMessage(data
, datalen
,
591 pr_debug("nf_ct_h245: decoding error: %s\n",
592 ret
== H323_ERROR_BOUND
?
593 "out of bound" : "out of range");
594 /* We don't drop when decoding error */
598 /* Process H.245 signal */
599 if (process_h245(skb
, ct
, ctinfo
, &data
, dataoff
, &mscm
) < 0)
603 spin_unlock_bh(&nf_h323_lock
);
607 spin_unlock_bh(&nf_h323_lock
);
609 pr_info("nf_ct_h245: packet dropped\n");
613 /****************************************************************************/
614 static const struct nf_conntrack_expect_policy h245_exp_policy
= {
615 .max_expected
= H323_RTP_CHANNEL_MAX
* 4 + 2 /* T.120 */,
619 static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly
= {
622 .tuple
.src
.l3num
= AF_UNSPEC
,
623 .tuple
.dst
.protonum
= IPPROTO_UDP
,
625 .expect_policy
= &h245_exp_policy
,
628 /****************************************************************************/
629 int get_h225_addr(struct nf_conn
*ct
, unsigned char *data
,
630 TransportAddress
*taddr
,
631 union nf_inet_addr
*addr
, __be16
*port
)
633 const unsigned char *p
;
636 switch (taddr
->choice
) {
637 case eTransportAddress_ipAddress
:
638 if (nf_ct_l3num(ct
) != AF_INET
)
640 p
= data
+ taddr
->ipAddress
.ip
;
643 case eTransportAddress_ip6Address
:
644 if (nf_ct_l3num(ct
) != AF_INET6
)
646 p
= data
+ taddr
->ip6Address
.ip
;
653 memcpy(addr
, p
, len
);
654 memset((void *)addr
+ len
, 0, sizeof(*addr
) - len
);
655 memcpy(port
, p
+ len
, sizeof(__be16
));
660 /****************************************************************************/
661 static int expect_h245(struct sk_buff
*skb
, struct nf_conn
*ct
,
662 enum ip_conntrack_info ctinfo
,
663 unsigned char **data
, int dataoff
,
664 TransportAddress
*taddr
)
666 int dir
= CTINFO2DIR(ctinfo
);
669 union nf_inet_addr addr
;
670 struct nf_conntrack_expect
*exp
;
671 typeof(nat_h245_hook
) nat_h245
;
673 /* Read h245Address */
674 if (!get_h225_addr(ct
, *data
, taddr
, &addr
, &port
) ||
675 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) ||
679 /* Create expect for h245 connection */
680 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
682 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
683 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
684 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
685 IPPROTO_TCP
, NULL
, &port
);
686 exp
->helper
= &nf_conntrack_helper_h245
;
688 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
689 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
690 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
691 (nat_h245
= rcu_dereference(nat_h245_hook
)) &&
692 ct
->status
& IPS_NAT_MASK
) {
694 ret
= nat_h245(skb
, ct
, ctinfo
, data
, dataoff
, taddr
,
696 } else { /* Conntrack only */
697 if (nf_ct_expect_related(exp
) == 0) {
698 pr_debug("nf_ct_q931: expect H.245 ");
699 nf_ct_dump_tuple(&exp
->tuple
);
704 nf_ct_expect_put(exp
);
709 /* If the calling party is on the same side of the forward-to party,
710 * we don't need to track the second call */
711 static int callforward_do_filter(const union nf_inet_addr
*src
,
712 const union nf_inet_addr
*dst
,
715 const struct nf_afinfo
*afinfo
;
718 /* rcu_read_lock()ed by nf_hook_slow() */
719 afinfo
= nf_get_afinfo(family
);
725 struct flowi4 fl1
, fl2
;
726 struct rtable
*rt1
, *rt2
;
728 memset(&fl1
, 0, sizeof(fl1
));
731 memset(&fl2
, 0, sizeof(fl2
));
733 if (!afinfo
->route(&init_net
, (struct dst_entry
**)&rt1
,
734 flowi4_to_flowi(&fl1
), false)) {
735 if (!afinfo
->route(&init_net
, (struct dst_entry
**)&rt2
,
736 flowi4_to_flowi(&fl2
), false)) {
737 if (rt1
->rt_gateway
== rt2
->rt_gateway
&&
738 rt1
->dst
.dev
== rt2
->dst
.dev
)
740 dst_release(&rt2
->dst
);
742 dst_release(&rt1
->dst
);
746 #if IS_ENABLED(CONFIG_NF_CONNTRACK_IPV6)
748 struct flowi6 fl1
, fl2
;
749 struct rt6_info
*rt1
, *rt2
;
751 memset(&fl1
, 0, sizeof(fl1
));
752 fl1
.daddr
= src
->in6
;
754 memset(&fl2
, 0, sizeof(fl2
));
755 fl2
.daddr
= dst
->in6
;
756 if (!afinfo
->route(&init_net
, (struct dst_entry
**)&rt1
,
757 flowi6_to_flowi(&fl1
), false)) {
758 if (!afinfo
->route(&init_net
, (struct dst_entry
**)&rt2
,
759 flowi6_to_flowi(&fl2
), false)) {
760 if (!memcmp(&rt1
->rt6i_gateway
, &rt2
->rt6i_gateway
,
761 sizeof(rt1
->rt6i_gateway
)) &&
762 rt1
->dst
.dev
== rt2
->dst
.dev
)
764 dst_release(&rt2
->dst
);
766 dst_release(&rt1
->dst
);
776 /****************************************************************************/
777 static int expect_callforwarding(struct sk_buff
*skb
,
779 enum ip_conntrack_info ctinfo
,
780 unsigned char **data
, int dataoff
,
781 TransportAddress
*taddr
)
783 int dir
= CTINFO2DIR(ctinfo
);
786 union nf_inet_addr addr
;
787 struct nf_conntrack_expect
*exp
;
788 typeof(nat_callforwarding_hook
) nat_callforwarding
;
790 /* Read alternativeAddress */
791 if (!get_h225_addr(ct
, *data
, taddr
, &addr
, &port
) || port
== 0)
794 /* If the calling party is on the same side of the forward-to party,
795 * we don't need to track the second call */
796 if (callforward_filter
&&
797 callforward_do_filter(&addr
, &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
799 pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
803 /* Create expect for the second call leg */
804 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
806 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
807 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
808 IPPROTO_TCP
, NULL
, &port
);
809 exp
->helper
= nf_conntrack_helper_q931
;
811 if (memcmp(&ct
->tuplehash
[dir
].tuple
.src
.u3
,
812 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
813 sizeof(ct
->tuplehash
[dir
].tuple
.src
.u3
)) &&
814 (nat_callforwarding
= rcu_dereference(nat_callforwarding_hook
)) &&
815 ct
->status
& IPS_NAT_MASK
) {
817 ret
= nat_callforwarding(skb
, ct
, ctinfo
, data
, dataoff
,
819 } else { /* Conntrack only */
820 if (nf_ct_expect_related(exp
) == 0) {
821 pr_debug("nf_ct_q931: expect Call Forwarding ");
822 nf_ct_dump_tuple(&exp
->tuple
);
827 nf_ct_expect_put(exp
);
832 /****************************************************************************/
833 static int process_setup(struct sk_buff
*skb
, struct nf_conn
*ct
,
834 enum ip_conntrack_info ctinfo
,
835 unsigned char **data
, int dataoff
,
838 int dir
= CTINFO2DIR(ctinfo
);
842 union nf_inet_addr addr
;
843 typeof(set_h225_addr_hook
) set_h225_addr
;
845 pr_debug("nf_ct_q931: Setup\n");
847 if (setup
->options
& eSetup_UUIE_h245Address
) {
848 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
849 &setup
->h245Address
);
854 set_h225_addr
= rcu_dereference(set_h225_addr_hook
);
855 if ((setup
->options
& eSetup_UUIE_destCallSignalAddress
) &&
856 (set_h225_addr
) && ct
->status
& IPS_NAT_MASK
&&
857 get_h225_addr(ct
, *data
, &setup
->destCallSignalAddress
,
859 memcmp(&addr
, &ct
->tuplehash
[!dir
].tuple
.src
.u3
, sizeof(addr
))) {
860 pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n",
861 &addr
, ntohs(port
), &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
862 ntohs(ct
->tuplehash
[!dir
].tuple
.src
.u
.tcp
.port
));
863 ret
= set_h225_addr(skb
, data
, dataoff
,
864 &setup
->destCallSignalAddress
,
865 &ct
->tuplehash
[!dir
].tuple
.src
.u3
,
866 ct
->tuplehash
[!dir
].tuple
.src
.u
.tcp
.port
);
871 if ((setup
->options
& eSetup_UUIE_sourceCallSignalAddress
) &&
872 (set_h225_addr
) && ct
->status
& IPS_NAT_MASK
&&
873 get_h225_addr(ct
, *data
, &setup
->sourceCallSignalAddress
,
875 memcmp(&addr
, &ct
->tuplehash
[!dir
].tuple
.dst
.u3
, sizeof(addr
))) {
876 pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n",
877 &addr
, ntohs(port
), &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
878 ntohs(ct
->tuplehash
[!dir
].tuple
.dst
.u
.tcp
.port
));
879 ret
= set_h225_addr(skb
, data
, dataoff
,
880 &setup
->sourceCallSignalAddress
,
881 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
882 ct
->tuplehash
[!dir
].tuple
.dst
.u
.tcp
.port
);
887 if (setup
->options
& eSetup_UUIE_fastStart
) {
888 for (i
= 0; i
< setup
->fastStart
.count
; i
++) {
889 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
890 &setup
->fastStart
.item
[i
]);
899 /****************************************************************************/
900 static int process_callproceeding(struct sk_buff
*skb
,
902 enum ip_conntrack_info ctinfo
,
903 unsigned char **data
, int dataoff
,
904 CallProceeding_UUIE
*callproc
)
909 pr_debug("nf_ct_q931: CallProceeding\n");
911 if (callproc
->options
& eCallProceeding_UUIE_h245Address
) {
912 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
913 &callproc
->h245Address
);
918 if (callproc
->options
& eCallProceeding_UUIE_fastStart
) {
919 for (i
= 0; i
< callproc
->fastStart
.count
; i
++) {
920 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
921 &callproc
->fastStart
.item
[i
]);
930 /****************************************************************************/
931 static int process_connect(struct sk_buff
*skb
, struct nf_conn
*ct
,
932 enum ip_conntrack_info ctinfo
,
933 unsigned char **data
, int dataoff
,
934 Connect_UUIE
*connect
)
939 pr_debug("nf_ct_q931: Connect\n");
941 if (connect
->options
& eConnect_UUIE_h245Address
) {
942 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
943 &connect
->h245Address
);
948 if (connect
->options
& eConnect_UUIE_fastStart
) {
949 for (i
= 0; i
< connect
->fastStart
.count
; i
++) {
950 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
951 &connect
->fastStart
.item
[i
]);
960 /****************************************************************************/
961 static int process_alerting(struct sk_buff
*skb
, struct nf_conn
*ct
,
962 enum ip_conntrack_info ctinfo
,
963 unsigned char **data
, int dataoff
,
964 Alerting_UUIE
*alert
)
969 pr_debug("nf_ct_q931: Alerting\n");
971 if (alert
->options
& eAlerting_UUIE_h245Address
) {
972 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
973 &alert
->h245Address
);
978 if (alert
->options
& eAlerting_UUIE_fastStart
) {
979 for (i
= 0; i
< alert
->fastStart
.count
; i
++) {
980 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
981 &alert
->fastStart
.item
[i
]);
990 /****************************************************************************/
991 static int process_facility(struct sk_buff
*skb
, struct nf_conn
*ct
,
992 enum ip_conntrack_info ctinfo
,
993 unsigned char **data
, int dataoff
,
994 Facility_UUIE
*facility
)
999 pr_debug("nf_ct_q931: Facility\n");
1001 if (facility
->reason
.choice
== eFacilityReason_callForwarded
) {
1002 if (facility
->options
& eFacility_UUIE_alternativeAddress
)
1003 return expect_callforwarding(skb
, ct
, ctinfo
, data
,
1006 alternativeAddress
);
1010 if (facility
->options
& eFacility_UUIE_h245Address
) {
1011 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
1012 &facility
->h245Address
);
1017 if (facility
->options
& eFacility_UUIE_fastStart
) {
1018 for (i
= 0; i
< facility
->fastStart
.count
; i
++) {
1019 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
1020 &facility
->fastStart
.item
[i
]);
1029 /****************************************************************************/
1030 static int process_progress(struct sk_buff
*skb
, struct nf_conn
*ct
,
1031 enum ip_conntrack_info ctinfo
,
1032 unsigned char **data
, int dataoff
,
1033 Progress_UUIE
*progress
)
1038 pr_debug("nf_ct_q931: Progress\n");
1040 if (progress
->options
& eProgress_UUIE_h245Address
) {
1041 ret
= expect_h245(skb
, ct
, ctinfo
, data
, dataoff
,
1042 &progress
->h245Address
);
1047 if (progress
->options
& eProgress_UUIE_fastStart
) {
1048 for (i
= 0; i
< progress
->fastStart
.count
; i
++) {
1049 ret
= process_olc(skb
, ct
, ctinfo
, data
, dataoff
,
1050 &progress
->fastStart
.item
[i
]);
1059 /****************************************************************************/
1060 static int process_q931(struct sk_buff
*skb
, struct nf_conn
*ct
,
1061 enum ip_conntrack_info ctinfo
,
1062 unsigned char **data
, int dataoff
, Q931
*q931
)
1064 H323_UU_PDU
*pdu
= &q931
->UUIE
.h323_uu_pdu
;
1068 switch (pdu
->h323_message_body
.choice
) {
1069 case eH323_UU_PDU_h323_message_body_setup
:
1070 ret
= process_setup(skb
, ct
, ctinfo
, data
, dataoff
,
1071 &pdu
->h323_message_body
.setup
);
1073 case eH323_UU_PDU_h323_message_body_callProceeding
:
1074 ret
= process_callproceeding(skb
, ct
, ctinfo
, data
, dataoff
,
1075 &pdu
->h323_message_body
.
1078 case eH323_UU_PDU_h323_message_body_connect
:
1079 ret
= process_connect(skb
, ct
, ctinfo
, data
, dataoff
,
1080 &pdu
->h323_message_body
.connect
);
1082 case eH323_UU_PDU_h323_message_body_alerting
:
1083 ret
= process_alerting(skb
, ct
, ctinfo
, data
, dataoff
,
1084 &pdu
->h323_message_body
.alerting
);
1086 case eH323_UU_PDU_h323_message_body_facility
:
1087 ret
= process_facility(skb
, ct
, ctinfo
, data
, dataoff
,
1088 &pdu
->h323_message_body
.facility
);
1090 case eH323_UU_PDU_h323_message_body_progress
:
1091 ret
= process_progress(skb
, ct
, ctinfo
, data
, dataoff
,
1092 &pdu
->h323_message_body
.progress
);
1095 pr_debug("nf_ct_q931: Q.931 signal %d\n",
1096 pdu
->h323_message_body
.choice
);
1103 if (pdu
->options
& eH323_UU_PDU_h245Control
) {
1104 for (i
= 0; i
< pdu
->h245Control
.count
; i
++) {
1105 ret
= process_h245(skb
, ct
, ctinfo
, data
, dataoff
,
1106 &pdu
->h245Control
.item
[i
]);
1115 /****************************************************************************/
1116 static int q931_help(struct sk_buff
*skb
, unsigned int protoff
,
1117 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
1120 unsigned char *data
= NULL
;
1125 /* Until there's been traffic both ways, don't look in packets. */
1126 if (ctinfo
!= IP_CT_ESTABLISHED
&& ctinfo
!= IP_CT_ESTABLISHED_REPLY
)
1129 pr_debug("nf_ct_q931: skblen = %u\n", skb
->len
);
1131 spin_lock_bh(&nf_h323_lock
);
1133 /* Process each TPKT */
1134 while (get_tpkt_data(skb
, protoff
, ct
, ctinfo
,
1135 &data
, &datalen
, &dataoff
)) {
1136 pr_debug("nf_ct_q931: TPKT len=%d ", datalen
);
1137 nf_ct_dump_tuple(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
1139 /* Decode Q.931 signal */
1140 ret
= DecodeQ931(data
, datalen
, &q931
);
1142 pr_debug("nf_ct_q931: decoding error: %s\n",
1143 ret
== H323_ERROR_BOUND
?
1144 "out of bound" : "out of range");
1145 /* We don't drop when decoding error */
1149 /* Process Q.931 signal */
1150 if (process_q931(skb
, ct
, ctinfo
, &data
, dataoff
, &q931
) < 0)
1154 spin_unlock_bh(&nf_h323_lock
);
1158 spin_unlock_bh(&nf_h323_lock
);
1159 if (net_ratelimit())
1160 pr_info("nf_ct_q931: packet dropped\n");
1164 /****************************************************************************/
1165 static const struct nf_conntrack_expect_policy q931_exp_policy
= {
1166 /* T.120 and H.245 */
1167 .max_expected
= H323_RTP_CHANNEL_MAX
* 4 + 4,
1171 static struct nf_conntrack_helper nf_conntrack_helper_q931
[] __read_mostly
= {
1175 .tuple
.src
.l3num
= AF_INET
,
1176 .tuple
.src
.u
.tcp
.port
= cpu_to_be16(Q931_PORT
),
1177 .tuple
.dst
.protonum
= IPPROTO_TCP
,
1179 .expect_policy
= &q931_exp_policy
,
1184 .tuple
.src
.l3num
= AF_INET6
,
1185 .tuple
.src
.u
.tcp
.port
= cpu_to_be16(Q931_PORT
),
1186 .tuple
.dst
.protonum
= IPPROTO_TCP
,
1188 .expect_policy
= &q931_exp_policy
,
1192 /****************************************************************************/
1193 static unsigned char *get_udp_data(struct sk_buff
*skb
, unsigned int protoff
,
1196 const struct udphdr
*uh
;
1200 uh
= skb_header_pointer(skb
, protoff
, sizeof(_uh
), &_uh
);
1203 dataoff
= protoff
+ sizeof(_uh
);
1204 if (dataoff
>= skb
->len
)
1206 *datalen
= skb
->len
- dataoff
;
1207 return skb_header_pointer(skb
, dataoff
, *datalen
, h323_buffer
);
1210 /****************************************************************************/
1211 static struct nf_conntrack_expect
*find_expect(struct nf_conn
*ct
,
1212 union nf_inet_addr
*addr
,
1215 struct net
*net
= nf_ct_net(ct
);
1216 struct nf_conntrack_expect
*exp
;
1217 struct nf_conntrack_tuple tuple
;
1219 memset(&tuple
.src
.u3
, 0, sizeof(tuple
.src
.u3
));
1220 tuple
.src
.u
.tcp
.port
= 0;
1221 memcpy(&tuple
.dst
.u3
, addr
, sizeof(tuple
.dst
.u3
));
1222 tuple
.dst
.u
.tcp
.port
= port
;
1223 tuple
.dst
.protonum
= IPPROTO_TCP
;
1225 exp
= __nf_ct_expect_find(net
, nf_ct_zone(ct
), &tuple
);
1226 if (exp
&& exp
->master
== ct
)
1231 /****************************************************************************/
1232 static int set_expect_timeout(struct nf_conntrack_expect
*exp
,
1233 unsigned int timeout
)
1235 if (!exp
|| !del_timer(&exp
->timeout
))
1238 exp
->timeout
.expires
= jiffies
+ timeout
* HZ
;
1239 add_timer(&exp
->timeout
);
1244 /****************************************************************************/
1245 static int expect_q931(struct sk_buff
*skb
, struct nf_conn
*ct
,
1246 enum ip_conntrack_info ctinfo
,
1247 unsigned char **data
,
1248 TransportAddress
*taddr
, int count
)
1250 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1251 int dir
= CTINFO2DIR(ctinfo
);
1255 union nf_inet_addr addr
;
1256 struct nf_conntrack_expect
*exp
;
1257 typeof(nat_q931_hook
) nat_q931
;
1259 /* Look for the first related address */
1260 for (i
= 0; i
< count
; i
++) {
1261 if (get_h225_addr(ct
, *data
, &taddr
[i
], &addr
, &port
) &&
1262 memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
,
1263 sizeof(addr
)) == 0 && port
!= 0)
1267 if (i
>= count
) /* Not found */
1270 /* Create expect for Q.931 */
1271 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1273 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1274 gkrouted_only
? /* only accept calls from GK? */
1275 &ct
->tuplehash
[!dir
].tuple
.src
.u3
: NULL
,
1276 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1277 IPPROTO_TCP
, NULL
, &port
);
1278 exp
->helper
= nf_conntrack_helper_q931
;
1279 exp
->flags
= NF_CT_EXPECT_PERMANENT
; /* Accept multiple calls */
1281 nat_q931
= rcu_dereference(nat_q931_hook
);
1282 if (nat_q931
&& ct
->status
& IPS_NAT_MASK
) { /* Need NAT */
1283 ret
= nat_q931(skb
, ct
, ctinfo
, data
, taddr
, i
, port
, exp
);
1284 } else { /* Conntrack only */
1285 if (nf_ct_expect_related(exp
) == 0) {
1286 pr_debug("nf_ct_ras: expect Q.931 ");
1287 nf_ct_dump_tuple(&exp
->tuple
);
1289 /* Save port for looking up expect in processing RCF */
1290 info
->sig_port
[dir
] = port
;
1295 nf_ct_expect_put(exp
);
1300 /****************************************************************************/
1301 static int process_grq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1302 enum ip_conntrack_info ctinfo
,
1303 unsigned char **data
, GatekeeperRequest
*grq
)
1305 typeof(set_ras_addr_hook
) set_ras_addr
;
1307 pr_debug("nf_ct_ras: GRQ\n");
1309 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1310 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) /* NATed */
1311 return set_ras_addr(skb
, ct
, ctinfo
, data
,
1312 &grq
->rasAddress
, 1);
1316 /****************************************************************************/
1317 static int process_gcf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1318 enum ip_conntrack_info ctinfo
,
1319 unsigned char **data
, GatekeeperConfirm
*gcf
)
1321 int dir
= CTINFO2DIR(ctinfo
);
1324 union nf_inet_addr addr
;
1325 struct nf_conntrack_expect
*exp
;
1327 pr_debug("nf_ct_ras: GCF\n");
1329 if (!get_h225_addr(ct
, *data
, &gcf
->rasAddress
, &addr
, &port
))
1332 /* Registration port is the same as discovery port */
1333 if (!memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1334 port
== ct
->tuplehash
[dir
].tuple
.src
.u
.udp
.port
)
1337 /* Avoid RAS expectation loops. A GCF is never expected. */
1338 if (test_bit(IPS_EXPECTED_BIT
, &ct
->status
))
1341 /* Need new expect */
1342 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1344 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1345 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1346 IPPROTO_UDP
, NULL
, &port
);
1347 exp
->helper
= nf_conntrack_helper_ras
;
1349 if (nf_ct_expect_related(exp
) == 0) {
1350 pr_debug("nf_ct_ras: expect RAS ");
1351 nf_ct_dump_tuple(&exp
->tuple
);
1355 nf_ct_expect_put(exp
);
1360 /****************************************************************************/
1361 static int process_rrq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1362 enum ip_conntrack_info ctinfo
,
1363 unsigned char **data
, RegistrationRequest
*rrq
)
1365 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1367 typeof(set_ras_addr_hook
) set_ras_addr
;
1369 pr_debug("nf_ct_ras: RRQ\n");
1371 ret
= expect_q931(skb
, ct
, ctinfo
, data
,
1372 rrq
->callSignalAddress
.item
,
1373 rrq
->callSignalAddress
.count
);
1377 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1378 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) {
1379 ret
= set_ras_addr(skb
, ct
, ctinfo
, data
,
1380 rrq
->rasAddress
.item
,
1381 rrq
->rasAddress
.count
);
1386 if (rrq
->options
& eRegistrationRequest_timeToLive
) {
1387 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq
->timeToLive
);
1388 info
->timeout
= rrq
->timeToLive
;
1390 info
->timeout
= default_rrq_ttl
;
1395 /****************************************************************************/
1396 static int process_rcf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1397 enum ip_conntrack_info ctinfo
,
1398 unsigned char **data
, RegistrationConfirm
*rcf
)
1400 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1401 int dir
= CTINFO2DIR(ctinfo
);
1403 struct nf_conntrack_expect
*exp
;
1404 typeof(set_sig_addr_hook
) set_sig_addr
;
1406 pr_debug("nf_ct_ras: RCF\n");
1408 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1409 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1410 ret
= set_sig_addr(skb
, ct
, ctinfo
, data
,
1411 rcf
->callSignalAddress
.item
,
1412 rcf
->callSignalAddress
.count
);
1417 if (rcf
->options
& eRegistrationConfirm_timeToLive
) {
1418 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf
->timeToLive
);
1419 info
->timeout
= rcf
->timeToLive
;
1422 if (info
->timeout
> 0) {
1423 pr_debug("nf_ct_ras: set RAS connection timeout to "
1424 "%u seconds\n", info
->timeout
);
1425 nf_ct_refresh(ct
, skb
, info
->timeout
* HZ
);
1427 /* Set expect timeout */
1428 spin_lock_bh(&nf_conntrack_lock
);
1429 exp
= find_expect(ct
, &ct
->tuplehash
[dir
].tuple
.dst
.u3
,
1430 info
->sig_port
[!dir
]);
1432 pr_debug("nf_ct_ras: set Q.931 expect "
1433 "timeout to %u seconds for",
1435 nf_ct_dump_tuple(&exp
->tuple
);
1436 set_expect_timeout(exp
, info
->timeout
);
1438 spin_unlock_bh(&nf_conntrack_lock
);
1444 /****************************************************************************/
1445 static int process_urq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1446 enum ip_conntrack_info ctinfo
,
1447 unsigned char **data
, UnregistrationRequest
*urq
)
1449 struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1450 int dir
= CTINFO2DIR(ctinfo
);
1452 typeof(set_sig_addr_hook
) set_sig_addr
;
1454 pr_debug("nf_ct_ras: URQ\n");
1456 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1457 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1458 ret
= set_sig_addr(skb
, ct
, ctinfo
, data
,
1459 urq
->callSignalAddress
.item
,
1460 urq
->callSignalAddress
.count
);
1465 /* Clear old expect */
1466 nf_ct_remove_expectations(ct
);
1467 info
->sig_port
[dir
] = 0;
1468 info
->sig_port
[!dir
] = 0;
1470 /* Give it 30 seconds for UCF or URJ */
1471 nf_ct_refresh(ct
, skb
, 30 * HZ
);
1476 /****************************************************************************/
1477 static int process_arq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1478 enum ip_conntrack_info ctinfo
,
1479 unsigned char **data
, AdmissionRequest
*arq
)
1481 const struct nf_ct_h323_master
*info
= &nfct_help(ct
)->help
.ct_h323_info
;
1482 int dir
= CTINFO2DIR(ctinfo
);
1484 union nf_inet_addr addr
;
1485 typeof(set_h225_addr_hook
) set_h225_addr
;
1487 pr_debug("nf_ct_ras: ARQ\n");
1489 set_h225_addr
= rcu_dereference(set_h225_addr_hook
);
1490 if ((arq
->options
& eAdmissionRequest_destCallSignalAddress
) &&
1491 get_h225_addr(ct
, *data
, &arq
->destCallSignalAddress
,
1493 !memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1494 port
== info
->sig_port
[dir
] &&
1495 set_h225_addr
&& ct
->status
& IPS_NAT_MASK
) {
1497 return set_h225_addr(skb
, data
, 0,
1498 &arq
->destCallSignalAddress
,
1499 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1500 info
->sig_port
[!dir
]);
1503 if ((arq
->options
& eAdmissionRequest_srcCallSignalAddress
) &&
1504 get_h225_addr(ct
, *data
, &arq
->srcCallSignalAddress
,
1506 !memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.src
.u3
, sizeof(addr
)) &&
1507 set_h225_addr
&& ct
->status
& IPS_NAT_MASK
) {
1509 return set_h225_addr(skb
, data
, 0,
1510 &arq
->srcCallSignalAddress
,
1511 &ct
->tuplehash
[!dir
].tuple
.dst
.u3
,
1518 /****************************************************************************/
1519 static int process_acf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1520 enum ip_conntrack_info ctinfo
,
1521 unsigned char **data
, AdmissionConfirm
*acf
)
1523 int dir
= CTINFO2DIR(ctinfo
);
1526 union nf_inet_addr addr
;
1527 struct nf_conntrack_expect
*exp
;
1528 typeof(set_sig_addr_hook
) set_sig_addr
;
1530 pr_debug("nf_ct_ras: ACF\n");
1532 if (!get_h225_addr(ct
, *data
, &acf
->destCallSignalAddress
,
1536 if (!memcmp(&addr
, &ct
->tuplehash
[dir
].tuple
.dst
.u3
, sizeof(addr
))) {
1538 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1539 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
)
1540 return set_sig_addr(skb
, ct
, ctinfo
, data
,
1541 &acf
->destCallSignalAddress
, 1);
1545 /* Need new expect */
1546 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1548 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1549 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1550 IPPROTO_TCP
, NULL
, &port
);
1551 exp
->flags
= NF_CT_EXPECT_PERMANENT
;
1552 exp
->helper
= nf_conntrack_helper_q931
;
1554 if (nf_ct_expect_related(exp
) == 0) {
1555 pr_debug("nf_ct_ras: expect Q.931 ");
1556 nf_ct_dump_tuple(&exp
->tuple
);
1560 nf_ct_expect_put(exp
);
1565 /****************************************************************************/
1566 static int process_lrq(struct sk_buff
*skb
, struct nf_conn
*ct
,
1567 enum ip_conntrack_info ctinfo
,
1568 unsigned char **data
, LocationRequest
*lrq
)
1570 typeof(set_ras_addr_hook
) set_ras_addr
;
1572 pr_debug("nf_ct_ras: LRQ\n");
1574 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1575 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
)
1576 return set_ras_addr(skb
, ct
, ctinfo
, data
,
1577 &lrq
->replyAddress
, 1);
1581 /****************************************************************************/
1582 static int process_lcf(struct sk_buff
*skb
, struct nf_conn
*ct
,
1583 enum ip_conntrack_info ctinfo
,
1584 unsigned char **data
, LocationConfirm
*lcf
)
1586 int dir
= CTINFO2DIR(ctinfo
);
1589 union nf_inet_addr addr
;
1590 struct nf_conntrack_expect
*exp
;
1592 pr_debug("nf_ct_ras: LCF\n");
1594 if (!get_h225_addr(ct
, *data
, &lcf
->callSignalAddress
,
1598 /* Need new expect for call signal */
1599 if ((exp
= nf_ct_expect_alloc(ct
)) == NULL
)
1601 nf_ct_expect_init(exp
, NF_CT_EXPECT_CLASS_DEFAULT
, nf_ct_l3num(ct
),
1602 &ct
->tuplehash
[!dir
].tuple
.src
.u3
, &addr
,
1603 IPPROTO_TCP
, NULL
, &port
);
1604 exp
->flags
= NF_CT_EXPECT_PERMANENT
;
1605 exp
->helper
= nf_conntrack_helper_q931
;
1607 if (nf_ct_expect_related(exp
) == 0) {
1608 pr_debug("nf_ct_ras: expect Q.931 ");
1609 nf_ct_dump_tuple(&exp
->tuple
);
1613 nf_ct_expect_put(exp
);
1615 /* Ignore rasAddress */
1620 /****************************************************************************/
1621 static int process_irr(struct sk_buff
*skb
, struct nf_conn
*ct
,
1622 enum ip_conntrack_info ctinfo
,
1623 unsigned char **data
, InfoRequestResponse
*irr
)
1626 typeof(set_ras_addr_hook
) set_ras_addr
;
1627 typeof(set_sig_addr_hook
) set_sig_addr
;
1629 pr_debug("nf_ct_ras: IRR\n");
1631 set_ras_addr
= rcu_dereference(set_ras_addr_hook
);
1632 if (set_ras_addr
&& ct
->status
& IPS_NAT_MASK
) {
1633 ret
= set_ras_addr(skb
, ct
, ctinfo
, data
,
1634 &irr
->rasAddress
, 1);
1639 set_sig_addr
= rcu_dereference(set_sig_addr_hook
);
1640 if (set_sig_addr
&& ct
->status
& IPS_NAT_MASK
) {
1641 ret
= set_sig_addr(skb
, ct
, ctinfo
, data
,
1642 irr
->callSignalAddress
.item
,
1643 irr
->callSignalAddress
.count
);
1651 /****************************************************************************/
1652 static int process_ras(struct sk_buff
*skb
, struct nf_conn
*ct
,
1653 enum ip_conntrack_info ctinfo
,
1654 unsigned char **data
, RasMessage
*ras
)
1656 switch (ras
->choice
) {
1657 case eRasMessage_gatekeeperRequest
:
1658 return process_grq(skb
, ct
, ctinfo
, data
,
1659 &ras
->gatekeeperRequest
);
1660 case eRasMessage_gatekeeperConfirm
:
1661 return process_gcf(skb
, ct
, ctinfo
, data
,
1662 &ras
->gatekeeperConfirm
);
1663 case eRasMessage_registrationRequest
:
1664 return process_rrq(skb
, ct
, ctinfo
, data
,
1665 &ras
->registrationRequest
);
1666 case eRasMessage_registrationConfirm
:
1667 return process_rcf(skb
, ct
, ctinfo
, data
,
1668 &ras
->registrationConfirm
);
1669 case eRasMessage_unregistrationRequest
:
1670 return process_urq(skb
, ct
, ctinfo
, data
,
1671 &ras
->unregistrationRequest
);
1672 case eRasMessage_admissionRequest
:
1673 return process_arq(skb
, ct
, ctinfo
, data
,
1674 &ras
->admissionRequest
);
1675 case eRasMessage_admissionConfirm
:
1676 return process_acf(skb
, ct
, ctinfo
, data
,
1677 &ras
->admissionConfirm
);
1678 case eRasMessage_locationRequest
:
1679 return process_lrq(skb
, ct
, ctinfo
, data
,
1680 &ras
->locationRequest
);
1681 case eRasMessage_locationConfirm
:
1682 return process_lcf(skb
, ct
, ctinfo
, data
,
1683 &ras
->locationConfirm
);
1684 case eRasMessage_infoRequestResponse
:
1685 return process_irr(skb
, ct
, ctinfo
, data
,
1686 &ras
->infoRequestResponse
);
1688 pr_debug("nf_ct_ras: RAS message %d\n", ras
->choice
);
1695 /****************************************************************************/
1696 static int ras_help(struct sk_buff
*skb
, unsigned int protoff
,
1697 struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
)
1699 static RasMessage ras
;
1700 unsigned char *data
;
1704 pr_debug("nf_ct_ras: skblen = %u\n", skb
->len
);
1706 spin_lock_bh(&nf_h323_lock
);
1709 data
= get_udp_data(skb
, protoff
, &datalen
);
1712 pr_debug("nf_ct_ras: RAS message len=%d ", datalen
);
1713 nf_ct_dump_tuple(&ct
->tuplehash
[CTINFO2DIR(ctinfo
)].tuple
);
1715 /* Decode RAS message */
1716 ret
= DecodeRasMessage(data
, datalen
, &ras
);
1718 pr_debug("nf_ct_ras: decoding error: %s\n",
1719 ret
== H323_ERROR_BOUND
?
1720 "out of bound" : "out of range");
1724 /* Process RAS message */
1725 if (process_ras(skb
, ct
, ctinfo
, &data
, &ras
) < 0)
1729 spin_unlock_bh(&nf_h323_lock
);
1733 spin_unlock_bh(&nf_h323_lock
);
1734 if (net_ratelimit())
1735 pr_info("nf_ct_ras: packet dropped\n");
1739 /****************************************************************************/
1740 static const struct nf_conntrack_expect_policy ras_exp_policy
= {
1745 static struct nf_conntrack_helper nf_conntrack_helper_ras
[] __read_mostly
= {
1749 .tuple
.src
.l3num
= AF_INET
,
1750 .tuple
.src
.u
.udp
.port
= cpu_to_be16(RAS_PORT
),
1751 .tuple
.dst
.protonum
= IPPROTO_UDP
,
1753 .expect_policy
= &ras_exp_policy
,
1758 .tuple
.src
.l3num
= AF_INET6
,
1759 .tuple
.src
.u
.udp
.port
= cpu_to_be16(RAS_PORT
),
1760 .tuple
.dst
.protonum
= IPPROTO_UDP
,
1762 .expect_policy
= &ras_exp_policy
,
1766 /****************************************************************************/
1767 static void __exit
nf_conntrack_h323_fini(void)
1769 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[1]);
1770 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[0]);
1771 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[1]);
1772 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[0]);
1773 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245
);
1775 pr_debug("nf_ct_h323: fini\n");
1778 /****************************************************************************/
1779 static int __init
nf_conntrack_h323_init(void)
1783 h323_buffer
= kmalloc(65536, GFP_KERNEL
);
1786 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_h245
);
1789 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_q931
[0]);
1792 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_q931
[1]);
1795 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_ras
[0]);
1798 ret
= nf_conntrack_helper_register(&nf_conntrack_helper_ras
[1]);
1801 pr_debug("nf_ct_h323: init success\n");
1805 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras
[0]);
1807 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[1]);
1809 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931
[0]);
1811 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245
);
1817 /****************************************************************************/
1818 module_init(nf_conntrack_h323_init
);
1819 module_exit(nf_conntrack_h323_fini
);
1821 EXPORT_SYMBOL_GPL(get_h225_addr
);
1822 EXPORT_SYMBOL_GPL(set_h245_addr_hook
);
1823 EXPORT_SYMBOL_GPL(set_h225_addr_hook
);
1824 EXPORT_SYMBOL_GPL(set_sig_addr_hook
);
1825 EXPORT_SYMBOL_GPL(set_ras_addr_hook
);
1826 EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook
);
1827 EXPORT_SYMBOL_GPL(nat_t120_hook
);
1828 EXPORT_SYMBOL_GPL(nat_h245_hook
);
1829 EXPORT_SYMBOL_GPL(nat_callforwarding_hook
);
1830 EXPORT_SYMBOL_GPL(nat_q931_hook
);
1832 MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1833 MODULE_DESCRIPTION("H.323 connection tracking helper");
1834 MODULE_LICENSE("GPL");
1835 MODULE_ALIAS("ip_conntrack_h323");
1836 MODULE_ALIAS_NFCT_HELPER("h323");