netfilter: xt_limit: fix invalid return code in limit_mt_check()
[linux-2.6.git] / net / netfilter / nf_conntrack_h323_main.c
1 /*
2  * H.323 connection tracking helper
3  *
4  * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net>
5  *
6  * This source code is licensed under General Public License version 2.
7  *
8  * Based on the 'brute force' H.323 connection tracking module by
9  * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
10  *
11  * For more information, please see http://nath323.sourceforge.net/
12  */
13
14 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/ctype.h>
17 #include <linux/inet.h>
18 #include <linux/in.h>
19 #include <linux/ip.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>
25
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>
33
34 /* Parameters */
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");
38
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");
42
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)");
48
49 /* Hooks for NAT */
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)
54                            __read_mostly;
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)
59                            __read_mostly;
60 int (*set_sig_addr_hook) (struct sk_buff *skb,
61                           struct nf_conn *ct,
62                           enum ip_conntrack_info ctinfo,
63                           unsigned char **data,
64                           TransportAddress *taddr, int count) __read_mostly;
65 int (*set_ras_addr_hook) (struct sk_buff *skb,
66                           struct nf_conn *ct,
67                           enum ip_conntrack_info ctinfo,
68                           unsigned char **data,
69                           TransportAddress *taddr, int count) __read_mostly;
70 int (*nat_rtp_rtcp_hook) (struct sk_buff *skb,
71                           struct nf_conn *ct,
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,
79                       struct nf_conn *ct,
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,
85                       struct nf_conn *ct,
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,
91                                 struct nf_conn *ct,
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,
97                       struct nf_conn *ct,
98                       enum ip_conntrack_info ctinfo,
99                       unsigned char **data, TransportAddress *taddr, int idx,
100                       __be16 port, struct nf_conntrack_expect *exp)
101                       __read_mostly;
102
103 static DEFINE_SPINLOCK(nf_h323_lock);
104 static char *h323_buffer;
105
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[];
109
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)
114 {
115         struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
116         int dir = CTINFO2DIR(ctinfo);
117         const struct tcphdr *th;
118         struct tcphdr _tcph;
119         int tcpdatalen;
120         int tcpdataoff;
121         unsigned char *tpkt;
122         int tpktlen;
123         int tpktoff;
124
125         /* Get TCP header */
126         th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
127         if (th == NULL)
128                 return 0;
129
130         /* Get TCP data offset */
131         tcpdataoff = protoff + th->doff * 4;
132
133         /* Get TCP data length */
134         tcpdatalen = skb->len - tcpdataoff;
135         if (tcpdatalen <= 0)    /* No TCP data */
136                 goto clear_out;
137
138         if (*data == NULL) {    /* first TPKT */
139                 /* Get first TPKT pointer */
140                 tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen,
141                                           h323_buffer);
142                 BUG_ON(tpkt == NULL);
143
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
153                                          * received */
154                                         *data = tpkt;
155                                         *datalen = info->tpkt_len[dir];
156                                         *dataoff = 0;
157                                         goto out;
158                                 }
159
160                                 /* Fragmented TPKT */
161                                 pr_debug("nf_ct_h323: fragmented TPKT\n");
162                                 goto clear_out;
163                         }
164
165                         /* It is not even a TPKT */
166                         return 0;
167                 }
168                 tpktoff = 0;
169         } else {                /* Next TPKT */
170                 tpktoff = *dataoff + *datalen;
171                 tcpdatalen -= tpktoff;
172                 if (tcpdatalen <= 4)    /* No more TPKT */
173                         goto clear_out;
174                 tpkt = *data + *datalen;
175
176                 /* Validate TPKT identifier */
177                 if (tpkt[0] != 0x03 || tpkt[1] != 0)
178                         goto clear_out;
179         }
180
181         /* Validate TPKT length */
182         tpktlen = tpkt[2] * 256 + tpkt[3];
183         if (tpktlen < 4)
184                 goto clear_out;
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",
190                                  tpktlen - 4);
191                         info->tpkt_len[dir] = tpktlen - 4;
192                         return 0;
193                 }
194
195                 if (net_ratelimit())
196                         printk("nf_ct_h323: incomplete TPKT (fragmented?)\n");
197                 goto clear_out;
198         }
199
200         /* This is the encapsulated data */
201         *data = tpkt + 4;
202         *datalen = tpktlen - 4;
203         *dataoff = tpktoff + 4;
204
205       out:
206         /* Clear TPKT length */
207         info->tpkt_len[dir] = 0;
208         return 1;
209
210       clear_out:
211         info->tpkt_len[dir] = 0;
212         return 0;
213 }
214
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)
219 {
220         const unsigned char *p;
221         int len;
222
223         if (taddr->choice != eH245_TransportAddress_unicastAddress)
224                 return 0;
225
226         switch (taddr->unicastAddress.choice) {
227         case eUnicastAddress_iPAddress:
228                 if (nf_ct_l3num(ct) != AF_INET)
229                         return 0;
230                 p = data + taddr->unicastAddress.iPAddress.network;
231                 len = 4;
232                 break;
233         case eUnicastAddress_iP6Address:
234                 if (nf_ct_l3num(ct) != AF_INET6)
235                         return 0;
236                 p = data + taddr->unicastAddress.iP6Address.network;
237                 len = 16;
238                 break;
239         default:
240                 return 0;
241         }
242
243         memcpy(addr, p, len);
244         memset((void *)addr + len, 0, sizeof(*addr) - len);
245         memcpy(port, p + len, sizeof(__be16));
246
247         return 1;
248 }
249
250 /****************************************************************************/
251 static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct,
252                            enum ip_conntrack_info ctinfo,
253                            unsigned char **data, int dataoff,
254                            H245_TransportAddress *taddr)
255 {
256         int dir = CTINFO2DIR(ctinfo);
257         int ret = 0;
258         __be16 port;
259         __be16 rtp_port, rtcp_port;
260         union nf_inet_addr addr;
261         struct nf_conntrack_expect *rtp_exp;
262         struct nf_conntrack_expect *rtcp_exp;
263         typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp;
264
265         /* Read RTP or RTCP address */
266         if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
267             memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
268             port == 0)
269                 return 0;
270
271         /* RTP port is even */
272         port &= htons(~1);
273         rtp_port = port;
274         rtcp_port = htons(ntohs(port) + 1);
275
276         /* Create expect for RTP */
277         if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL)
278                 return -1;
279         nf_ct_expect_init(rtp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
280                           &ct->tuplehash[!dir].tuple.src.u3,
281                           &ct->tuplehash[!dir].tuple.dst.u3,
282                           IPPROTO_UDP, NULL, &rtp_port);
283
284         /* Create expect for RTCP */
285         if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) {
286                 nf_ct_expect_put(rtp_exp);
287                 return -1;
288         }
289         nf_ct_expect_init(rtcp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
290                           &ct->tuplehash[!dir].tuple.src.u3,
291                           &ct->tuplehash[!dir].tuple.dst.u3,
292                           IPPROTO_UDP, NULL, &rtcp_port);
293
294         if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
295                    &ct->tuplehash[!dir].tuple.dst.u3,
296                    sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
297                    (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) &&
298                    ct->status & IPS_NAT_MASK) {
299                 /* NAT needed */
300                 ret = nat_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
301                                    taddr, port, rtp_port, rtp_exp, rtcp_exp);
302         } else {                /* Conntrack only */
303                 if (nf_ct_expect_related(rtp_exp) == 0) {
304                         if (nf_ct_expect_related(rtcp_exp) == 0) {
305                                 pr_debug("nf_ct_h323: expect RTP ");
306                                 nf_ct_dump_tuple(&rtp_exp->tuple);
307                                 pr_debug("nf_ct_h323: expect RTCP ");
308                                 nf_ct_dump_tuple(&rtcp_exp->tuple);
309                         } else {
310                                 nf_ct_unexpect_related(rtp_exp);
311                                 ret = -1;
312                         }
313                 } else
314                         ret = -1;
315         }
316
317         nf_ct_expect_put(rtp_exp);
318         nf_ct_expect_put(rtcp_exp);
319
320         return ret;
321 }
322
323 /****************************************************************************/
324 static int expect_t120(struct sk_buff *skb,
325                        struct nf_conn *ct,
326                        enum ip_conntrack_info ctinfo,
327                        unsigned char **data, int dataoff,
328                        H245_TransportAddress *taddr)
329 {
330         int dir = CTINFO2DIR(ctinfo);
331         int ret = 0;
332         __be16 port;
333         union nf_inet_addr addr;
334         struct nf_conntrack_expect *exp;
335         typeof(nat_t120_hook) nat_t120;
336
337         /* Read T.120 address */
338         if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
339             memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
340             port == 0)
341                 return 0;
342
343         /* Create expect for T.120 connections */
344         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
345                 return -1;
346         nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
347                           &ct->tuplehash[!dir].tuple.src.u3,
348                           &ct->tuplehash[!dir].tuple.dst.u3,
349                           IPPROTO_TCP, NULL, &port);
350         exp->flags = NF_CT_EXPECT_PERMANENT;    /* Accept multiple channels */
351
352         if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
353                    &ct->tuplehash[!dir].tuple.dst.u3,
354                    sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
355             (nat_t120 = rcu_dereference(nat_t120_hook)) &&
356             ct->status & IPS_NAT_MASK) {
357                 /* NAT needed */
358                 ret = nat_t120(skb, ct, ctinfo, data, dataoff, taddr,
359                                port, exp);
360         } else {                /* Conntrack only */
361                 if (nf_ct_expect_related(exp) == 0) {
362                         pr_debug("nf_ct_h323: expect T.120 ");
363                         nf_ct_dump_tuple(&exp->tuple);
364                 } else
365                         ret = -1;
366         }
367
368         nf_ct_expect_put(exp);
369
370         return ret;
371 }
372
373 /****************************************************************************/
374 static int process_h245_channel(struct sk_buff *skb,
375                                 struct nf_conn *ct,
376                                 enum ip_conntrack_info ctinfo,
377                                 unsigned char **data, int dataoff,
378                                 H2250LogicalChannelParameters *channel)
379 {
380         int ret;
381
382         if (channel->options & eH2250LogicalChannelParameters_mediaChannel) {
383                 /* RTP */
384                 ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
385                                       &channel->mediaChannel);
386                 if (ret < 0)
387                         return -1;
388         }
389
390         if (channel->
391             options & eH2250LogicalChannelParameters_mediaControlChannel) {
392                 /* RTCP */
393                 ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
394                                       &channel->mediaControlChannel);
395                 if (ret < 0)
396                         return -1;
397         }
398
399         return 0;
400 }
401
402 /****************************************************************************/
403 static int process_olc(struct sk_buff *skb, struct nf_conn *ct,
404                        enum ip_conntrack_info ctinfo,
405                        unsigned char **data, int dataoff,
406                        OpenLogicalChannel *olc)
407 {
408         int ret;
409
410         pr_debug("nf_ct_h323: OpenLogicalChannel\n");
411
412         if (olc->forwardLogicalChannelParameters.multiplexParameters.choice ==
413             eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)
414         {
415                 ret = process_h245_channel(skb, ct, ctinfo, data, dataoff,
416                                            &olc->
417                                            forwardLogicalChannelParameters.
418                                            multiplexParameters.
419                                            h2250LogicalChannelParameters);
420                 if (ret < 0)
421                         return -1;
422         }
423
424         if ((olc->options &
425              eOpenLogicalChannel_reverseLogicalChannelParameters) &&
426             (olc->reverseLogicalChannelParameters.options &
427              eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters)
428             && (olc->reverseLogicalChannelParameters.multiplexParameters.
429                 choice ==
430                 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
431         {
432                 ret =
433                     process_h245_channel(skb, ct, ctinfo, data, dataoff,
434                                          &olc->
435                                          reverseLogicalChannelParameters.
436                                          multiplexParameters.
437                                          h2250LogicalChannelParameters);
438                 if (ret < 0)
439                         return -1;
440         }
441
442         if ((olc->options & eOpenLogicalChannel_separateStack) &&
443             olc->forwardLogicalChannelParameters.dataType.choice ==
444             eDataType_data &&
445             olc->forwardLogicalChannelParameters.dataType.data.application.
446             choice == eDataApplicationCapability_application_t120 &&
447             olc->forwardLogicalChannelParameters.dataType.data.application.
448             t120.choice == eDataProtocolCapability_separateLANStack &&
449             olc->separateStack.networkAddress.choice ==
450             eNetworkAccessParameters_networkAddress_localAreaAddress) {
451                 ret = expect_t120(skb, ct, ctinfo, data, dataoff,
452                                   &olc->separateStack.networkAddress.
453                                   localAreaAddress);
454                 if (ret < 0)
455                         return -1;
456         }
457
458         return 0;
459 }
460
461 /****************************************************************************/
462 static int process_olca(struct sk_buff *skb, struct nf_conn *ct,
463                         enum ip_conntrack_info ctinfo,
464                         unsigned char **data, int dataoff,
465                         OpenLogicalChannelAck *olca)
466 {
467         H2250LogicalChannelAckParameters *ack;
468         int ret;
469
470         pr_debug("nf_ct_h323: OpenLogicalChannelAck\n");
471
472         if ((olca->options &
473              eOpenLogicalChannelAck_reverseLogicalChannelParameters) &&
474             (olca->reverseLogicalChannelParameters.options &
475              eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters)
476             && (olca->reverseLogicalChannelParameters.multiplexParameters.
477                 choice ==
478                 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
479         {
480                 ret = process_h245_channel(skb, ct, ctinfo, data, dataoff,
481                                            &olca->
482                                            reverseLogicalChannelParameters.
483                                            multiplexParameters.
484                                            h2250LogicalChannelParameters);
485                 if (ret < 0)
486                         return -1;
487         }
488
489         if ((olca->options &
490              eOpenLogicalChannelAck_forwardMultiplexAckParameters) &&
491             (olca->forwardMultiplexAckParameters.choice ==
492              eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters))
493         {
494                 ack = &olca->forwardMultiplexAckParameters.
495                     h2250LogicalChannelAckParameters;
496                 if (ack->options &
497                     eH2250LogicalChannelAckParameters_mediaChannel) {
498                         /* RTP */
499                         ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
500                                               &ack->mediaChannel);
501                         if (ret < 0)
502                                 return -1;
503                 }
504
505                 if (ack->options &
506                     eH2250LogicalChannelAckParameters_mediaControlChannel) {
507                         /* RTCP */
508                         ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
509                                               &ack->mediaControlChannel);
510                         if (ret < 0)
511                                 return -1;
512                 }
513         }
514
515         if ((olca->options & eOpenLogicalChannelAck_separateStack) &&
516                 olca->separateStack.networkAddress.choice ==
517                 eNetworkAccessParameters_networkAddress_localAreaAddress) {
518                 ret = expect_t120(skb, ct, ctinfo, data, dataoff,
519                                   &olca->separateStack.networkAddress.
520                                   localAreaAddress);
521                 if (ret < 0)
522                         return -1;
523         }
524
525         return 0;
526 }
527
528 /****************************************************************************/
529 static int process_h245(struct sk_buff *skb, struct nf_conn *ct,
530                         enum ip_conntrack_info ctinfo,
531                         unsigned char **data, int dataoff,
532                         MultimediaSystemControlMessage *mscm)
533 {
534         switch (mscm->choice) {
535         case eMultimediaSystemControlMessage_request:
536                 if (mscm->request.choice ==
537                     eRequestMessage_openLogicalChannel) {
538                         return process_olc(skb, ct, ctinfo, data, dataoff,
539                                            &mscm->request.openLogicalChannel);
540                 }
541                 pr_debug("nf_ct_h323: H.245 Request %d\n",
542                          mscm->request.choice);
543                 break;
544         case eMultimediaSystemControlMessage_response:
545                 if (mscm->response.choice ==
546                     eResponseMessage_openLogicalChannelAck) {
547                         return process_olca(skb, ct, ctinfo, data, dataoff,
548                                             &mscm->response.
549                                             openLogicalChannelAck);
550                 }
551                 pr_debug("nf_ct_h323: H.245 Response %d\n",
552                          mscm->response.choice);
553                 break;
554         default:
555                 pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice);
556                 break;
557         }
558
559         return 0;
560 }
561
562 /****************************************************************************/
563 static int h245_help(struct sk_buff *skb, unsigned int protoff,
564                      struct nf_conn *ct, enum ip_conntrack_info ctinfo)
565 {
566         static MultimediaSystemControlMessage mscm;
567         unsigned char *data = NULL;
568         int datalen;
569         int dataoff;
570         int ret;
571
572         /* Until there's been traffic both ways, don't look in packets. */
573         if (ctinfo != IP_CT_ESTABLISHED &&
574             ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
575                 return NF_ACCEPT;
576         }
577         pr_debug("nf_ct_h245: skblen = %u\n", skb->len);
578
579         spin_lock_bh(&nf_h323_lock);
580
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);
586
587                 /* Decode H.245 signal */
588                 ret = DecodeMultimediaSystemControlMessage(data, datalen,
589                                                            &mscm);
590                 if (ret < 0) {
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 */
595                         break;
596                 }
597
598                 /* Process H.245 signal */
599                 if (process_h245(skb, ct, ctinfo, &data, dataoff, &mscm) < 0)
600                         goto drop;
601         }
602
603         spin_unlock_bh(&nf_h323_lock);
604         return NF_ACCEPT;
605
606       drop:
607         spin_unlock_bh(&nf_h323_lock);
608         if (net_ratelimit())
609                 printk("nf_ct_h245: packet dropped\n");
610         return NF_DROP;
611 }
612
613 /****************************************************************************/
614 static const struct nf_conntrack_expect_policy h245_exp_policy = {
615         .max_expected   = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */,
616         .timeout        = 240,
617 };
618
619 static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
620         .name                   = "H.245",
621         .me                     = THIS_MODULE,
622         .tuple.src.l3num        = AF_UNSPEC,
623         .tuple.dst.protonum     = IPPROTO_UDP,
624         .help                   = h245_help,
625         .expect_policy          = &h245_exp_policy,
626 };
627
628 /****************************************************************************/
629 int get_h225_addr(struct nf_conn *ct, unsigned char *data,
630                   TransportAddress *taddr,
631                   union nf_inet_addr *addr, __be16 *port)
632 {
633         const unsigned char *p;
634         int len;
635
636         switch (taddr->choice) {
637         case eTransportAddress_ipAddress:
638                 if (nf_ct_l3num(ct) != AF_INET)
639                         return 0;
640                 p = data + taddr->ipAddress.ip;
641                 len = 4;
642                 break;
643         case eTransportAddress_ip6Address:
644                 if (nf_ct_l3num(ct) != AF_INET6)
645                         return 0;
646                 p = data + taddr->ip6Address.ip;
647                 len = 16;
648                 break;
649         default:
650                 return 0;
651         }
652
653         memcpy(addr, p, len);
654         memset((void *)addr + len, 0, sizeof(*addr) - len);
655         memcpy(port, p + len, sizeof(__be16));
656
657         return 1;
658 }
659
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)
665 {
666         int dir = CTINFO2DIR(ctinfo);
667         int ret = 0;
668         __be16 port;
669         union nf_inet_addr addr;
670         struct nf_conntrack_expect *exp;
671         typeof(nat_h245_hook) nat_h245;
672
673         /* Read h245Address */
674         if (!get_h225_addr(ct, *data, taddr, &addr, &port) ||
675             memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
676             port == 0)
677                 return 0;
678
679         /* Create expect for h245 connection */
680         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
681                 return -1;
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;
687
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) {
693                 /* NAT needed */
694                 ret = nat_h245(skb, ct, ctinfo, data, dataoff, taddr,
695                                port, exp);
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);
700                 } else
701                         ret = -1;
702         }
703
704         nf_ct_expect_put(exp);
705
706         return ret;
707 }
708
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,
713                                  u_int8_t family)
714 {
715         const struct nf_afinfo *afinfo;
716         struct flowi fl1, fl2;
717         int ret = 0;
718
719         /* rcu_read_lock()ed by nf_hook_slow() */
720         afinfo = nf_get_afinfo(family);
721         if (!afinfo)
722                 return 0;
723
724         memset(&fl1, 0, sizeof(fl1));
725         memset(&fl2, 0, sizeof(fl2));
726
727         switch (family) {
728         case AF_INET: {
729                 struct rtable *rt1, *rt2;
730
731                 fl1.fl4_dst = src->ip;
732                 fl2.fl4_dst = dst->ip;
733                 if (!afinfo->route((struct dst_entry **)&rt1, &fl1)) {
734                         if (!afinfo->route((struct dst_entry **)&rt2, &fl2)) {
735                                 if (rt1->rt_gateway == rt2->rt_gateway &&
736                                     rt1->u.dst.dev  == rt2->u.dst.dev)
737                                         ret = 1;
738                                 dst_release(&rt2->u.dst);
739                         }
740                         dst_release(&rt1->u.dst);
741                 }
742                 break;
743         }
744 #if defined(CONFIG_NF_CONNTRACK_IPV6) || \
745     defined(CONFIG_NF_CONNTRACK_IPV6_MODULE)
746         case AF_INET6: {
747                 struct rt6_info *rt1, *rt2;
748
749                 memcpy(&fl1.fl6_dst, src, sizeof(fl1.fl6_dst));
750                 memcpy(&fl2.fl6_dst, dst, sizeof(fl2.fl6_dst));
751                 if (!afinfo->route((struct dst_entry **)&rt1, &fl1)) {
752                         if (!afinfo->route((struct dst_entry **)&rt2, &fl2)) {
753                                 if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway,
754                                             sizeof(rt1->rt6i_gateway)) &&
755                                     rt1->u.dst.dev == rt2->u.dst.dev)
756                                         ret = 1;
757                                 dst_release(&rt2->u.dst);
758                         }
759                         dst_release(&rt1->u.dst);
760                 }
761                 break;
762         }
763 #endif
764         }
765         return ret;
766
767 }
768
769 /****************************************************************************/
770 static int expect_callforwarding(struct sk_buff *skb,
771                                  struct nf_conn *ct,
772                                  enum ip_conntrack_info ctinfo,
773                                  unsigned char **data, int dataoff,
774                                  TransportAddress *taddr)
775 {
776         int dir = CTINFO2DIR(ctinfo);
777         int ret = 0;
778         __be16 port;
779         union nf_inet_addr addr;
780         struct nf_conntrack_expect *exp;
781         typeof(nat_callforwarding_hook) nat_callforwarding;
782
783         /* Read alternativeAddress */
784         if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0)
785                 return 0;
786
787         /* If the calling party is on the same side of the forward-to party,
788          * we don't need to track the second call */
789         if (callforward_filter &&
790             callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3,
791                                   nf_ct_l3num(ct))) {
792                 pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
793                 return 0;
794         }
795
796         /* Create expect for the second call leg */
797         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
798                 return -1;
799         nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
800                           &ct->tuplehash[!dir].tuple.src.u3, &addr,
801                           IPPROTO_TCP, NULL, &port);
802         exp->helper = nf_conntrack_helper_q931;
803
804         if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
805                    &ct->tuplehash[!dir].tuple.dst.u3,
806                    sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
807             (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) &&
808             ct->status & IPS_NAT_MASK) {
809                 /* Need NAT */
810                 ret = nat_callforwarding(skb, ct, ctinfo, data, dataoff,
811                                          taddr, port, exp);
812         } else {                /* Conntrack only */
813                 if (nf_ct_expect_related(exp) == 0) {
814                         pr_debug("nf_ct_q931: expect Call Forwarding ");
815                         nf_ct_dump_tuple(&exp->tuple);
816                 } else
817                         ret = -1;
818         }
819
820         nf_ct_expect_put(exp);
821
822         return ret;
823 }
824
825 /****************************************************************************/
826 static int process_setup(struct sk_buff *skb, struct nf_conn *ct,
827                          enum ip_conntrack_info ctinfo,
828                          unsigned char **data, int dataoff,
829                          Setup_UUIE *setup)
830 {
831         int dir = CTINFO2DIR(ctinfo);
832         int ret;
833         int i;
834         __be16 port;
835         union nf_inet_addr addr;
836         typeof(set_h225_addr_hook) set_h225_addr;
837
838         pr_debug("nf_ct_q931: Setup\n");
839
840         if (setup->options & eSetup_UUIE_h245Address) {
841                 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
842                                   &setup->h245Address);
843                 if (ret < 0)
844                         return -1;
845         }
846
847         set_h225_addr = rcu_dereference(set_h225_addr_hook);
848         if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
849             (set_h225_addr) && ct->status & IPS_NAT_MASK &&
850             get_h225_addr(ct, *data, &setup->destCallSignalAddress,
851                           &addr, &port) &&
852             memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
853                 pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n",
854                          &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3,
855                          ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
856                 ret = set_h225_addr(skb, data, dataoff,
857                                     &setup->destCallSignalAddress,
858                                     &ct->tuplehash[!dir].tuple.src.u3,
859                                     ct->tuplehash[!dir].tuple.src.u.tcp.port);
860                 if (ret < 0)
861                         return -1;
862         }
863
864         if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
865             (set_h225_addr) && ct->status & IPS_NAT_MASK &&
866             get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
867                           &addr, &port) &&
868             memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
869                 pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n",
870                          &addr, ntohs(port), &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);
876                 if (ret < 0)
877                         return -1;
878         }
879
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]);
884                         if (ret < 0)
885                                 return -1;
886                 }
887         }
888
889         return 0;
890 }
891
892 /****************************************************************************/
893 static int process_callproceeding(struct sk_buff *skb,
894                                   struct nf_conn *ct,
895                                   enum ip_conntrack_info ctinfo,
896                                   unsigned char **data, int dataoff,
897                                   CallProceeding_UUIE *callproc)
898 {
899         int ret;
900         int i;
901
902         pr_debug("nf_ct_q931: CallProceeding\n");
903
904         if (callproc->options & eCallProceeding_UUIE_h245Address) {
905                 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
906                                   &callproc->h245Address);
907                 if (ret < 0)
908                         return -1;
909         }
910
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]);
915                         if (ret < 0)
916                                 return -1;
917                 }
918         }
919
920         return 0;
921 }
922
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)
928 {
929         int ret;
930         int i;
931
932         pr_debug("nf_ct_q931: Connect\n");
933
934         if (connect->options & eConnect_UUIE_h245Address) {
935                 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
936                                   &connect->h245Address);
937                 if (ret < 0)
938                         return -1;
939         }
940
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]);
945                         if (ret < 0)
946                                 return -1;
947                 }
948         }
949
950         return 0;
951 }
952
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)
958 {
959         int ret;
960         int i;
961
962         pr_debug("nf_ct_q931: Alerting\n");
963
964         if (alert->options & eAlerting_UUIE_h245Address) {
965                 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
966                                   &alert->h245Address);
967                 if (ret < 0)
968                         return -1;
969         }
970
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]);
975                         if (ret < 0)
976                                 return -1;
977                 }
978         }
979
980         return 0;
981 }
982
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)
988 {
989         int ret;
990         int i;
991
992         pr_debug("nf_ct_q931: Facility\n");
993
994         if (facility->reason.choice == eFacilityReason_callForwarded) {
995                 if (facility->options & eFacility_UUIE_alternativeAddress)
996                         return expect_callforwarding(skb, ct, ctinfo, data,
997                                                      dataoff,
998                                                      &facility->
999                                                      alternativeAddress);
1000                 return 0;
1001         }
1002
1003         if (facility->options & eFacility_UUIE_h245Address) {
1004                 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
1005                                   &facility->h245Address);
1006                 if (ret < 0)
1007                         return -1;
1008         }
1009
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]);
1014                         if (ret < 0)
1015                                 return -1;
1016                 }
1017         }
1018
1019         return 0;
1020 }
1021
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)
1027 {
1028         int ret;
1029         int i;
1030
1031         pr_debug("nf_ct_q931: Progress\n");
1032
1033         if (progress->options & eProgress_UUIE_h245Address) {
1034                 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
1035                                   &progress->h245Address);
1036                 if (ret < 0)
1037                         return -1;
1038         }
1039
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]);
1044                         if (ret < 0)
1045                                 return -1;
1046                 }
1047         }
1048
1049         return 0;
1050 }
1051
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)
1056 {
1057         H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
1058         int i;
1059         int ret = 0;
1060
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);
1065                 break;
1066         case eH323_UU_PDU_h323_message_body_callProceeding:
1067                 ret = process_callproceeding(skb, ct, ctinfo, data, dataoff,
1068                                              &pdu->h323_message_body.
1069                                              callProceeding);
1070                 break;
1071         case eH323_UU_PDU_h323_message_body_connect:
1072                 ret = process_connect(skb, ct, ctinfo, data, dataoff,
1073                                       &pdu->h323_message_body.connect);
1074                 break;
1075         case eH323_UU_PDU_h323_message_body_alerting:
1076                 ret = process_alerting(skb, ct, ctinfo, data, dataoff,
1077                                        &pdu->h323_message_body.alerting);
1078                 break;
1079         case eH323_UU_PDU_h323_message_body_facility:
1080                 ret = process_facility(skb, ct, ctinfo, data, dataoff,
1081                                        &pdu->h323_message_body.facility);
1082                 break;
1083         case eH323_UU_PDU_h323_message_body_progress:
1084                 ret = process_progress(skb, ct, ctinfo, data, dataoff,
1085                                        &pdu->h323_message_body.progress);
1086                 break;
1087         default:
1088                 pr_debug("nf_ct_q931: Q.931 signal %d\n",
1089                          pdu->h323_message_body.choice);
1090                 break;
1091         }
1092
1093         if (ret < 0)
1094                 return -1;
1095
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]);
1100                         if (ret < 0)
1101                                 return -1;
1102                 }
1103         }
1104
1105         return 0;
1106 }
1107
1108 /****************************************************************************/
1109 static int q931_help(struct sk_buff *skb, unsigned int protoff,
1110                      struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1111 {
1112         static Q931 q931;
1113         unsigned char *data = NULL;
1114         int datalen;
1115         int dataoff;
1116         int ret;
1117
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) {
1121                 return NF_ACCEPT;
1122         }
1123         pr_debug("nf_ct_q931: skblen = %u\n", skb->len);
1124
1125         spin_lock_bh(&nf_h323_lock);
1126
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);
1132
1133                 /* Decode Q.931 signal */
1134                 ret = DecodeQ931(data, datalen, &q931);
1135                 if (ret < 0) {
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 */
1140                         break;
1141                 }
1142
1143                 /* Process Q.931 signal */
1144                 if (process_q931(skb, ct, ctinfo, &data, dataoff, &q931) < 0)
1145                         goto drop;
1146         }
1147
1148         spin_unlock_bh(&nf_h323_lock);
1149         return NF_ACCEPT;
1150
1151       drop:
1152         spin_unlock_bh(&nf_h323_lock);
1153         if (net_ratelimit())
1154                 printk("nf_ct_q931: packet dropped\n");
1155         return NF_DROP;
1156 }
1157
1158 /****************************************************************************/
1159 static const struct nf_conntrack_expect_policy q931_exp_policy = {
1160         /* T.120 and H.245 */
1161         .max_expected           = H323_RTP_CHANNEL_MAX * 4 + 4,
1162         .timeout                = 240,
1163 };
1164
1165 static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
1166         {
1167                 .name                   = "Q.931",
1168                 .me                     = THIS_MODULE,
1169                 .tuple.src.l3num        = AF_INET,
1170                 .tuple.src.u.tcp.port   = cpu_to_be16(Q931_PORT),
1171                 .tuple.dst.protonum     = IPPROTO_TCP,
1172                 .help                   = q931_help,
1173                 .expect_policy          = &q931_exp_policy,
1174         },
1175         {
1176                 .name                   = "Q.931",
1177                 .me                     = THIS_MODULE,
1178                 .tuple.src.l3num        = AF_INET6,
1179                 .tuple.src.u.tcp.port   = cpu_to_be16(Q931_PORT),
1180                 .tuple.dst.protonum     = IPPROTO_TCP,
1181                 .help                   = q931_help,
1182                 .expect_policy          = &q931_exp_policy,
1183         },
1184 };
1185
1186 /****************************************************************************/
1187 static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff,
1188                                    int *datalen)
1189 {
1190         const struct udphdr *uh;
1191         struct udphdr _uh;
1192         int dataoff;
1193
1194         uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh);
1195         if (uh == NULL)
1196                 return NULL;
1197         dataoff = protoff + sizeof(_uh);
1198         if (dataoff >= skb->len)
1199                 return NULL;
1200         *datalen = skb->len - dataoff;
1201         return skb_header_pointer(skb, dataoff, *datalen, h323_buffer);
1202 }
1203
1204 /****************************************************************************/
1205 static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
1206                                                union nf_inet_addr *addr,
1207                                                __be16 port)
1208 {
1209         struct net *net = nf_ct_net(ct);
1210         struct nf_conntrack_expect *exp;
1211         struct nf_conntrack_tuple tuple;
1212
1213         memset(&tuple.src.u3, 0, sizeof(tuple.src.u3));
1214         tuple.src.u.tcp.port = 0;
1215         memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3));
1216         tuple.dst.u.tcp.port = port;
1217         tuple.dst.protonum = IPPROTO_TCP;
1218
1219         exp = __nf_ct_expect_find(net, &tuple);
1220         if (exp && exp->master == ct)
1221                 return exp;
1222         return NULL;
1223 }
1224
1225 /****************************************************************************/
1226 static int set_expect_timeout(struct nf_conntrack_expect *exp,
1227                               unsigned timeout)
1228 {
1229         if (!exp || !del_timer(&exp->timeout))
1230                 return 0;
1231
1232         exp->timeout.expires = jiffies + timeout * HZ;
1233         add_timer(&exp->timeout);
1234
1235         return 1;
1236 }
1237
1238 /****************************************************************************/
1239 static int expect_q931(struct sk_buff *skb, struct nf_conn *ct,
1240                        enum ip_conntrack_info ctinfo,
1241                        unsigned char **data,
1242                        TransportAddress *taddr, int count)
1243 {
1244         struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1245         int dir = CTINFO2DIR(ctinfo);
1246         int ret = 0;
1247         int i;
1248         __be16 port;
1249         union nf_inet_addr addr;
1250         struct nf_conntrack_expect *exp;
1251         typeof(nat_q931_hook) nat_q931;
1252
1253         /* Look for the first related address */
1254         for (i = 0; i < count; i++) {
1255                 if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
1256                     memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3,
1257                            sizeof(addr)) == 0 && port != 0)
1258                         break;
1259         }
1260
1261         if (i >= count)         /* Not found */
1262                 return 0;
1263
1264         /* Create expect for Q.931 */
1265         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1266                 return -1;
1267         nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1268                           gkrouted_only ? /* only accept calls from GK? */
1269                                 &ct->tuplehash[!dir].tuple.src.u3 : NULL,
1270                           &ct->tuplehash[!dir].tuple.dst.u3,
1271                           IPPROTO_TCP, NULL, &port);
1272         exp->helper = nf_conntrack_helper_q931;
1273         exp->flags = NF_CT_EXPECT_PERMANENT;    /* Accept multiple calls */
1274
1275         nat_q931 = rcu_dereference(nat_q931_hook);
1276         if (nat_q931 && ct->status & IPS_NAT_MASK) {    /* Need NAT */
1277                 ret = nat_q931(skb, ct, ctinfo, data, taddr, i, port, exp);
1278         } else {                /* Conntrack only */
1279                 if (nf_ct_expect_related(exp) == 0) {
1280                         pr_debug("nf_ct_ras: expect Q.931 ");
1281                         nf_ct_dump_tuple(&exp->tuple);
1282
1283                         /* Save port for looking up expect in processing RCF */
1284                         info->sig_port[dir] = port;
1285                 } else
1286                         ret = -1;
1287         }
1288
1289         nf_ct_expect_put(exp);
1290
1291         return ret;
1292 }
1293
1294 /****************************************************************************/
1295 static int process_grq(struct sk_buff *skb, struct nf_conn *ct,
1296                        enum ip_conntrack_info ctinfo,
1297                        unsigned char **data, GatekeeperRequest *grq)
1298 {
1299         typeof(set_ras_addr_hook) set_ras_addr;
1300
1301         pr_debug("nf_ct_ras: GRQ\n");
1302
1303         set_ras_addr = rcu_dereference(set_ras_addr_hook);
1304         if (set_ras_addr && ct->status & IPS_NAT_MASK)  /* NATed */
1305                 return set_ras_addr(skb, ct, ctinfo, data,
1306                                     &grq->rasAddress, 1);
1307         return 0;
1308 }
1309
1310 /****************************************************************************/
1311 static int process_gcf(struct sk_buff *skb, struct nf_conn *ct,
1312                        enum ip_conntrack_info ctinfo,
1313                        unsigned char **data, GatekeeperConfirm *gcf)
1314 {
1315         int dir = CTINFO2DIR(ctinfo);
1316         int ret = 0;
1317         __be16 port;
1318         union nf_inet_addr addr;
1319         struct nf_conntrack_expect *exp;
1320
1321         pr_debug("nf_ct_ras: GCF\n");
1322
1323         if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port))
1324                 return 0;
1325
1326         /* Registration port is the same as discovery port */
1327         if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1328             port == ct->tuplehash[dir].tuple.src.u.udp.port)
1329                 return 0;
1330
1331         /* Avoid RAS expectation loops. A GCF is never expected. */
1332         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1333                 return 0;
1334
1335         /* Need new expect */
1336         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1337                 return -1;
1338         nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1339                           &ct->tuplehash[!dir].tuple.src.u3, &addr,
1340                           IPPROTO_UDP, NULL, &port);
1341         exp->helper = nf_conntrack_helper_ras;
1342
1343         if (nf_ct_expect_related(exp) == 0) {
1344                 pr_debug("nf_ct_ras: expect RAS ");
1345                 nf_ct_dump_tuple(&exp->tuple);
1346         } else
1347                 ret = -1;
1348
1349         nf_ct_expect_put(exp);
1350
1351         return ret;
1352 }
1353
1354 /****************************************************************************/
1355 static int process_rrq(struct sk_buff *skb, struct nf_conn *ct,
1356                        enum ip_conntrack_info ctinfo,
1357                        unsigned char **data, RegistrationRequest *rrq)
1358 {
1359         struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1360         int ret;
1361         typeof(set_ras_addr_hook) set_ras_addr;
1362
1363         pr_debug("nf_ct_ras: RRQ\n");
1364
1365         ret = expect_q931(skb, ct, ctinfo, data,
1366                           rrq->callSignalAddress.item,
1367                           rrq->callSignalAddress.count);
1368         if (ret < 0)
1369                 return -1;
1370
1371         set_ras_addr = rcu_dereference(set_ras_addr_hook);
1372         if (set_ras_addr && ct->status & IPS_NAT_MASK) {
1373                 ret = set_ras_addr(skb, ct, ctinfo, data,
1374                                    rrq->rasAddress.item,
1375                                    rrq->rasAddress.count);
1376                 if (ret < 0)
1377                         return -1;
1378         }
1379
1380         if (rrq->options & eRegistrationRequest_timeToLive) {
1381                 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
1382                 info->timeout = rrq->timeToLive;
1383         } else
1384                 info->timeout = default_rrq_ttl;
1385
1386         return 0;
1387 }
1388
1389 /****************************************************************************/
1390 static int process_rcf(struct sk_buff *skb, struct nf_conn *ct,
1391                        enum ip_conntrack_info ctinfo,
1392                        unsigned char **data, RegistrationConfirm *rcf)
1393 {
1394         struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1395         int dir = CTINFO2DIR(ctinfo);
1396         int ret;
1397         struct nf_conntrack_expect *exp;
1398         typeof(set_sig_addr_hook) set_sig_addr;
1399
1400         pr_debug("nf_ct_ras: RCF\n");
1401
1402         set_sig_addr = rcu_dereference(set_sig_addr_hook);
1403         if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1404                 ret = set_sig_addr(skb, ct, ctinfo, data,
1405                                         rcf->callSignalAddress.item,
1406                                         rcf->callSignalAddress.count);
1407                 if (ret < 0)
1408                         return -1;
1409         }
1410
1411         if (rcf->options & eRegistrationConfirm_timeToLive) {
1412                 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
1413                 info->timeout = rcf->timeToLive;
1414         }
1415
1416         if (info->timeout > 0) {
1417                 pr_debug("nf_ct_ras: set RAS connection timeout to "
1418                          "%u seconds\n", info->timeout);
1419                 nf_ct_refresh(ct, skb, info->timeout * HZ);
1420
1421                 /* Set expect timeout */
1422                 spin_lock_bh(&nf_conntrack_lock);
1423                 exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
1424                                   info->sig_port[!dir]);
1425                 if (exp) {
1426                         pr_debug("nf_ct_ras: set Q.931 expect "
1427                                  "timeout to %u seconds for",
1428                                  info->timeout);
1429                         nf_ct_dump_tuple(&exp->tuple);
1430                         set_expect_timeout(exp, info->timeout);
1431                 }
1432                 spin_unlock_bh(&nf_conntrack_lock);
1433         }
1434
1435         return 0;
1436 }
1437
1438 /****************************************************************************/
1439 static int process_urq(struct sk_buff *skb, struct nf_conn *ct,
1440                        enum ip_conntrack_info ctinfo,
1441                        unsigned char **data, UnregistrationRequest *urq)
1442 {
1443         struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1444         int dir = CTINFO2DIR(ctinfo);
1445         int ret;
1446         typeof(set_sig_addr_hook) set_sig_addr;
1447
1448         pr_debug("nf_ct_ras: URQ\n");
1449
1450         set_sig_addr = rcu_dereference(set_sig_addr_hook);
1451         if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1452                 ret = set_sig_addr(skb, ct, ctinfo, data,
1453                                    urq->callSignalAddress.item,
1454                                    urq->callSignalAddress.count);
1455                 if (ret < 0)
1456                         return -1;
1457         }
1458
1459         /* Clear old expect */
1460         nf_ct_remove_expectations(ct);
1461         info->sig_port[dir] = 0;
1462         info->sig_port[!dir] = 0;
1463
1464         /* Give it 30 seconds for UCF or URJ */
1465         nf_ct_refresh(ct, skb, 30 * HZ);
1466
1467         return 0;
1468 }
1469
1470 /****************************************************************************/
1471 static int process_arq(struct sk_buff *skb, struct nf_conn *ct,
1472                        enum ip_conntrack_info ctinfo,
1473                        unsigned char **data, AdmissionRequest *arq)
1474 {
1475         const struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1476         int dir = CTINFO2DIR(ctinfo);
1477         __be16 port;
1478         union nf_inet_addr addr;
1479         typeof(set_h225_addr_hook) set_h225_addr;
1480
1481         pr_debug("nf_ct_ras: ARQ\n");
1482
1483         set_h225_addr = rcu_dereference(set_h225_addr_hook);
1484         if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
1485             get_h225_addr(ct, *data, &arq->destCallSignalAddress,
1486                           &addr, &port) &&
1487             !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1488             port == info->sig_port[dir] &&
1489             set_h225_addr && ct->status & IPS_NAT_MASK) {
1490                 /* Answering ARQ */
1491                 return set_h225_addr(skb, data, 0,
1492                                      &arq->destCallSignalAddress,
1493                                      &ct->tuplehash[!dir].tuple.dst.u3,
1494                                      info->sig_port[!dir]);
1495         }
1496
1497         if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
1498             get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
1499                           &addr, &port) &&
1500             !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1501             set_h225_addr && ct->status & IPS_NAT_MASK) {
1502                 /* Calling ARQ */
1503                 return set_h225_addr(skb, data, 0,
1504                                      &arq->srcCallSignalAddress,
1505                                      &ct->tuplehash[!dir].tuple.dst.u3,
1506                                      port);
1507         }
1508
1509         return 0;
1510 }
1511
1512 /****************************************************************************/
1513 static int process_acf(struct sk_buff *skb, struct nf_conn *ct,
1514                        enum ip_conntrack_info ctinfo,
1515                        unsigned char **data, AdmissionConfirm *acf)
1516 {
1517         int dir = CTINFO2DIR(ctinfo);
1518         int ret = 0;
1519         __be16 port;
1520         union nf_inet_addr addr;
1521         struct nf_conntrack_expect *exp;
1522         typeof(set_sig_addr_hook) set_sig_addr;
1523
1524         pr_debug("nf_ct_ras: ACF\n");
1525
1526         if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
1527                            &addr, &port))
1528                 return 0;
1529
1530         if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
1531                 /* Answering ACF */
1532                 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1533                 if (set_sig_addr && ct->status & IPS_NAT_MASK)
1534                         return set_sig_addr(skb, ct, ctinfo, data,
1535                                             &acf->destCallSignalAddress, 1);
1536                 return 0;
1537         }
1538
1539         /* Need new expect */
1540         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1541                 return -1;
1542         nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1543                           &ct->tuplehash[!dir].tuple.src.u3, &addr,
1544                           IPPROTO_TCP, NULL, &port);
1545         exp->flags = NF_CT_EXPECT_PERMANENT;
1546         exp->helper = nf_conntrack_helper_q931;
1547
1548         if (nf_ct_expect_related(exp) == 0) {
1549                 pr_debug("nf_ct_ras: expect Q.931 ");
1550                 nf_ct_dump_tuple(&exp->tuple);
1551         } else
1552                 ret = -1;
1553
1554         nf_ct_expect_put(exp);
1555
1556         return ret;
1557 }
1558
1559 /****************************************************************************/
1560 static int process_lrq(struct sk_buff *skb, struct nf_conn *ct,
1561                        enum ip_conntrack_info ctinfo,
1562                        unsigned char **data, LocationRequest *lrq)
1563 {
1564         typeof(set_ras_addr_hook) set_ras_addr;
1565
1566         pr_debug("nf_ct_ras: LRQ\n");
1567
1568         set_ras_addr = rcu_dereference(set_ras_addr_hook);
1569         if (set_ras_addr && ct->status & IPS_NAT_MASK)
1570                 return set_ras_addr(skb, ct, ctinfo, data,
1571                                     &lrq->replyAddress, 1);
1572         return 0;
1573 }
1574
1575 /****************************************************************************/
1576 static int process_lcf(struct sk_buff *skb, struct nf_conn *ct,
1577                        enum ip_conntrack_info ctinfo,
1578                        unsigned char **data, LocationConfirm *lcf)
1579 {
1580         int dir = CTINFO2DIR(ctinfo);
1581         int ret = 0;
1582         __be16 port;
1583         union nf_inet_addr addr;
1584         struct nf_conntrack_expect *exp;
1585
1586         pr_debug("nf_ct_ras: LCF\n");
1587
1588         if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
1589                            &addr, &port))
1590                 return 0;
1591
1592         /* Need new expect for call signal */
1593         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1594                 return -1;
1595         nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1596                           &ct->tuplehash[!dir].tuple.src.u3, &addr,
1597                           IPPROTO_TCP, NULL, &port);
1598         exp->flags = NF_CT_EXPECT_PERMANENT;
1599         exp->helper = nf_conntrack_helper_q931;
1600
1601         if (nf_ct_expect_related(exp) == 0) {
1602                 pr_debug("nf_ct_ras: expect Q.931 ");
1603                 nf_ct_dump_tuple(&exp->tuple);
1604         } else
1605                 ret = -1;
1606
1607         nf_ct_expect_put(exp);
1608
1609         /* Ignore rasAddress */
1610
1611         return ret;
1612 }
1613
1614 /****************************************************************************/
1615 static int process_irr(struct sk_buff *skb, struct nf_conn *ct,
1616                        enum ip_conntrack_info ctinfo,
1617                        unsigned char **data, InfoRequestResponse *irr)
1618 {
1619         int ret;
1620         typeof(set_ras_addr_hook) set_ras_addr;
1621         typeof(set_sig_addr_hook) set_sig_addr;
1622
1623         pr_debug("nf_ct_ras: IRR\n");
1624
1625         set_ras_addr = rcu_dereference(set_ras_addr_hook);
1626         if (set_ras_addr && ct->status & IPS_NAT_MASK) {
1627                 ret = set_ras_addr(skb, ct, ctinfo, data,
1628                                    &irr->rasAddress, 1);
1629                 if (ret < 0)
1630                         return -1;
1631         }
1632
1633         set_sig_addr = rcu_dereference(set_sig_addr_hook);
1634         if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1635                 ret = set_sig_addr(skb, ct, ctinfo, data,
1636                                         irr->callSignalAddress.item,
1637                                         irr->callSignalAddress.count);
1638                 if (ret < 0)
1639                         return -1;
1640         }
1641
1642         return 0;
1643 }
1644
1645 /****************************************************************************/
1646 static int process_ras(struct sk_buff *skb, struct nf_conn *ct,
1647                        enum ip_conntrack_info ctinfo,
1648                        unsigned char **data, RasMessage *ras)
1649 {
1650         switch (ras->choice) {
1651         case eRasMessage_gatekeeperRequest:
1652                 return process_grq(skb, ct, ctinfo, data,
1653                                    &ras->gatekeeperRequest);
1654         case eRasMessage_gatekeeperConfirm:
1655                 return process_gcf(skb, ct, ctinfo, data,
1656                                    &ras->gatekeeperConfirm);
1657         case eRasMessage_registrationRequest:
1658                 return process_rrq(skb, ct, ctinfo, data,
1659                                    &ras->registrationRequest);
1660         case eRasMessage_registrationConfirm:
1661                 return process_rcf(skb, ct, ctinfo, data,
1662                                    &ras->registrationConfirm);
1663         case eRasMessage_unregistrationRequest:
1664                 return process_urq(skb, ct, ctinfo, data,
1665                                    &ras->unregistrationRequest);
1666         case eRasMessage_admissionRequest:
1667                 return process_arq(skb, ct, ctinfo, data,
1668                                    &ras->admissionRequest);
1669         case eRasMessage_admissionConfirm:
1670                 return process_acf(skb, ct, ctinfo, data,
1671                                    &ras->admissionConfirm);
1672         case eRasMessage_locationRequest:
1673                 return process_lrq(skb, ct, ctinfo, data,
1674                                    &ras->locationRequest);
1675         case eRasMessage_locationConfirm:
1676                 return process_lcf(skb, ct, ctinfo, data,
1677                                    &ras->locationConfirm);
1678         case eRasMessage_infoRequestResponse:
1679                 return process_irr(skb, ct, ctinfo, data,
1680                                    &ras->infoRequestResponse);
1681         default:
1682                 pr_debug("nf_ct_ras: RAS message %d\n", ras->choice);
1683                 break;
1684         }
1685
1686         return 0;
1687 }
1688
1689 /****************************************************************************/
1690 static int ras_help(struct sk_buff *skb, unsigned int protoff,
1691                     struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1692 {
1693         static RasMessage ras;
1694         unsigned char *data;
1695         int datalen = 0;
1696         int ret;
1697
1698         pr_debug("nf_ct_ras: skblen = %u\n", skb->len);
1699
1700         spin_lock_bh(&nf_h323_lock);
1701
1702         /* Get UDP data */
1703         data = get_udp_data(skb, protoff, &datalen);
1704         if (data == NULL)
1705                 goto accept;
1706         pr_debug("nf_ct_ras: RAS message len=%d ", datalen);
1707         nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1708
1709         /* Decode RAS message */
1710         ret = DecodeRasMessage(data, datalen, &ras);
1711         if (ret < 0) {
1712                 pr_debug("nf_ct_ras: decoding error: %s\n",
1713                          ret == H323_ERROR_BOUND ?
1714                          "out of bound" : "out of range");
1715                 goto accept;
1716         }
1717
1718         /* Process RAS message */
1719         if (process_ras(skb, ct, ctinfo, &data, &ras) < 0)
1720                 goto drop;
1721
1722       accept:
1723         spin_unlock_bh(&nf_h323_lock);
1724         return NF_ACCEPT;
1725
1726       drop:
1727         spin_unlock_bh(&nf_h323_lock);
1728         if (net_ratelimit())
1729                 printk("nf_ct_ras: packet dropped\n");
1730         return NF_DROP;
1731 }
1732
1733 /****************************************************************************/
1734 static const struct nf_conntrack_expect_policy ras_exp_policy = {
1735         .max_expected           = 32,
1736         .timeout                = 240,
1737 };
1738
1739 static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
1740         {
1741                 .name                   = "RAS",
1742                 .me                     = THIS_MODULE,
1743                 .tuple.src.l3num        = AF_INET,
1744                 .tuple.src.u.udp.port   = cpu_to_be16(RAS_PORT),
1745                 .tuple.dst.protonum     = IPPROTO_UDP,
1746                 .help                   = ras_help,
1747                 .expect_policy          = &ras_exp_policy,
1748         },
1749         {
1750                 .name                   = "RAS",
1751                 .me                     = THIS_MODULE,
1752                 .tuple.src.l3num        = AF_INET6,
1753                 .tuple.src.u.udp.port   = cpu_to_be16(RAS_PORT),
1754                 .tuple.dst.protonum     = IPPROTO_UDP,
1755                 .help                   = ras_help,
1756                 .expect_policy          = &ras_exp_policy,
1757         },
1758 };
1759
1760 /****************************************************************************/
1761 static void __exit nf_conntrack_h323_fini(void)
1762 {
1763         nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]);
1764         nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1765         nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1766         nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
1767         nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
1768         kfree(h323_buffer);
1769         pr_debug("nf_ct_h323: fini\n");
1770 }
1771
1772 /****************************************************************************/
1773 static int __init nf_conntrack_h323_init(void)
1774 {
1775         int ret;
1776
1777         h323_buffer = kmalloc(65536, GFP_KERNEL);
1778         if (!h323_buffer)
1779                 return -ENOMEM;
1780         ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245);
1781         if (ret < 0)
1782                 goto err1;
1783         ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]);
1784         if (ret < 0)
1785                 goto err2;
1786         ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]);
1787         if (ret < 0)
1788                 goto err3;
1789         ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]);
1790         if (ret < 0)
1791                 goto err4;
1792         ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]);
1793         if (ret < 0)
1794                 goto err5;
1795         pr_debug("nf_ct_h323: init success\n");
1796         return 0;
1797
1798 err5:
1799         nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1800 err4:
1801         nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1802 err3:
1803         nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
1804 err2:
1805         nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
1806 err1:
1807         kfree(h323_buffer);
1808         return ret;
1809 }
1810
1811 /****************************************************************************/
1812 module_init(nf_conntrack_h323_init);
1813 module_exit(nf_conntrack_h323_fini);
1814
1815 EXPORT_SYMBOL_GPL(get_h225_addr);
1816 EXPORT_SYMBOL_GPL(set_h245_addr_hook);
1817 EXPORT_SYMBOL_GPL(set_h225_addr_hook);
1818 EXPORT_SYMBOL_GPL(set_sig_addr_hook);
1819 EXPORT_SYMBOL_GPL(set_ras_addr_hook);
1820 EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
1821 EXPORT_SYMBOL_GPL(nat_t120_hook);
1822 EXPORT_SYMBOL_GPL(nat_h245_hook);
1823 EXPORT_SYMBOL_GPL(nat_callforwarding_hook);
1824 EXPORT_SYMBOL_GPL(nat_q931_hook);
1825
1826 MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1827 MODULE_DESCRIPTION("H.323 connection tracking helper");
1828 MODULE_LICENSE("GPL");
1829 MODULE_ALIAS("ip_conntrack_h323");
1830 MODULE_ALIAS_NFCT_HELPER("h323");