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Linux/net/netfilter/nf_conntrack_h323_main.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * H.323 connection tracking helper
  4  *
  5  * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net>
  6  * Copyright (c) 2006-2012 Patrick McHardy <kaber@trash.net>
  7  *
  8  * Based on the 'brute force' H.323 connection tracking module by
  9  * Jozsef Kadlecsik <kadlec@netfilter.org>
 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/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>
 26 #include <linux/netfilter_ipv6.h>
 27 
 28 #include <net/netfilter/nf_conntrack.h>
 29 #include <net/netfilter/nf_conntrack_core.h>
 30 #include <net/netfilter/nf_conntrack_tuple.h>
 31 #include <net/netfilter/nf_conntrack_expect.h>
 32 #include <net/netfilter/nf_conntrack_ecache.h>
 33 #include <net/netfilter/nf_conntrack_helper.h>
 34 #include <net/netfilter/nf_conntrack_zones.h>
 35 #include <linux/netfilter/nf_conntrack_h323.h>
 36 
 37 /* Parameters */
 38 static unsigned int default_rrq_ttl __read_mostly = 300;
 39 module_param(default_rrq_ttl, uint, 0600);
 40 MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ");
 41 
 42 static int gkrouted_only __read_mostly = 1;
 43 module_param(gkrouted_only, int, 0600);
 44 MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper");
 45 
 46 static bool callforward_filter __read_mostly = true;
 47 module_param(callforward_filter, bool, 0600);
 48 MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations "
 49                                      "if both endpoints are on different sides "
 50                                      "(determined by routing information)");
 51 
 52 /* Hooks for NAT */
 53 int (*set_h245_addr_hook) (struct sk_buff *skb, unsigned int protoff,
 54                            unsigned char **data, int dataoff,
 55                            H245_TransportAddress *taddr,
 56                            union nf_inet_addr *addr, __be16 port)
 57                            __read_mostly;
 58 int (*set_h225_addr_hook) (struct sk_buff *skb, unsigned int protoff,
 59                            unsigned char **data, int dataoff,
 60                            TransportAddress *taddr,
 61                            union nf_inet_addr *addr, __be16 port)
 62                            __read_mostly;
 63 int (*set_sig_addr_hook) (struct sk_buff *skb,
 64                           struct nf_conn *ct,
 65                           enum ip_conntrack_info ctinfo,
 66                           unsigned int protoff, unsigned char **data,
 67                           TransportAddress *taddr, int count) __read_mostly;
 68 int (*set_ras_addr_hook) (struct sk_buff *skb,
 69                           struct nf_conn *ct,
 70                           enum ip_conntrack_info ctinfo,
 71                           unsigned int protoff, unsigned char **data,
 72                           TransportAddress *taddr, int count) __read_mostly;
 73 int (*nat_rtp_rtcp_hook) (struct sk_buff *skb,
 74                           struct nf_conn *ct,
 75                           enum ip_conntrack_info ctinfo,
 76                           unsigned int protoff,
 77                           unsigned char **data, int dataoff,
 78                           H245_TransportAddress *taddr,
 79                           __be16 port, __be16 rtp_port,
 80                           struct nf_conntrack_expect *rtp_exp,
 81                           struct nf_conntrack_expect *rtcp_exp) __read_mostly;
 82 int (*nat_t120_hook) (struct sk_buff *skb,
 83                       struct nf_conn *ct,
 84                       enum ip_conntrack_info ctinfo,
 85                       unsigned int protoff,
 86                       unsigned char **data, int dataoff,
 87                       H245_TransportAddress *taddr, __be16 port,
 88                       struct nf_conntrack_expect *exp) __read_mostly;
 89 int (*nat_h245_hook) (struct sk_buff *skb,
 90                       struct nf_conn *ct,
 91                       enum ip_conntrack_info ctinfo,
 92                       unsigned int protoff,
 93                       unsigned char **data, int dataoff,
 94                       TransportAddress *taddr, __be16 port,
 95                       struct nf_conntrack_expect *exp) __read_mostly;
 96 int (*nat_callforwarding_hook) (struct sk_buff *skb,
 97                                 struct nf_conn *ct,
 98                                 enum ip_conntrack_info ctinfo,
 99                                 unsigned int protoff,
100                                 unsigned char **data, int dataoff,
101                                 TransportAddress *taddr, __be16 port,
102                                 struct nf_conntrack_expect *exp) __read_mostly;
103 int (*nat_q931_hook) (struct sk_buff *skb,
104                       struct nf_conn *ct,
105                       enum ip_conntrack_info ctinfo,
106                       unsigned int protoff,
107                       unsigned char **data, TransportAddress *taddr, int idx,
108                       __be16 port, struct nf_conntrack_expect *exp)
109                       __read_mostly;
110 
111 static DEFINE_SPINLOCK(nf_h323_lock);
112 static char *h323_buffer;
113 
114 static struct nf_conntrack_helper nf_conntrack_helper_h245;
115 static struct nf_conntrack_helper nf_conntrack_helper_q931[];
116 static struct nf_conntrack_helper nf_conntrack_helper_ras[];
117 
118 static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff,
119                          struct nf_conn *ct, enum ip_conntrack_info ctinfo,
120                          unsigned char **data, int *datalen, int *dataoff)
121 {
122         struct nf_ct_h323_master *info = nfct_help_data(ct);
123         int dir = CTINFO2DIR(ctinfo);
124         const struct tcphdr *th;
125         struct tcphdr _tcph;
126         int tcpdatalen;
127         int tcpdataoff;
128         unsigned char *tpkt;
129         int tpktlen;
130         int tpktoff;
131 
132         /* Get TCP header */
133         th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
134         if (th == NULL)
135                 return 0;
136 
137         /* Get TCP data offset */
138         tcpdataoff = protoff + th->doff * 4;
139 
140         /* Get TCP data length */
141         tcpdatalen = skb->len - tcpdataoff;
142         if (tcpdatalen <= 0)    /* No TCP data */
143                 goto clear_out;
144 
145         if (*data == NULL) {    /* first TPKT */
146                 /* Get first TPKT pointer */
147                 tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen,
148                                           h323_buffer);
149                 BUG_ON(tpkt == NULL);
150 
151                 /* Validate TPKT identifier */
152                 if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) {
153                         /* Netmeeting sends TPKT header and data separately */
154                         if (info->tpkt_len[dir] > 0) {
155                                 pr_debug("nf_ct_h323: previous packet "
156                                          "indicated separate TPKT data of %hu "
157                                          "bytes\n", info->tpkt_len[dir]);
158                                 if (info->tpkt_len[dir] <= tcpdatalen) {
159                                         /* Yes, there was a TPKT header
160                                          * received */
161                                         *data = tpkt;
162                                         *datalen = info->tpkt_len[dir];
163                                         *dataoff = 0;
164                                         goto out;
165                                 }
166 
167                                 /* Fragmented TPKT */
168                                 pr_debug("nf_ct_h323: fragmented TPKT\n");
169                                 goto clear_out;
170                         }
171 
172                         /* It is not even a TPKT */
173                         return 0;
174                 }
175                 tpktoff = 0;
176         } else {                /* Next TPKT */
177                 tpktoff = *dataoff + *datalen;
178                 tcpdatalen -= tpktoff;
179                 if (tcpdatalen <= 4)    /* No more TPKT */
180                         goto clear_out;
181                 tpkt = *data + *datalen;
182 
183                 /* Validate TPKT identifier */
184                 if (tpkt[0] != 0x03 || tpkt[1] != 0)
185                         goto clear_out;
186         }
187 
188         /* Validate TPKT length */
189         tpktlen = tpkt[2] * 256 + tpkt[3];
190         if (tpktlen < 4)
191                 goto clear_out;
192         if (tpktlen > tcpdatalen) {
193                 if (tcpdatalen == 4) {  /* Separate TPKT header */
194                         /* Netmeeting sends TPKT header and data separately */
195                         pr_debug("nf_ct_h323: separate TPKT header indicates "
196                                  "there will be TPKT data of %hu bytes\n",
197                                  tpktlen - 4);
198                         info->tpkt_len[dir] = tpktlen - 4;
199                         return 0;
200                 }
201 
202                 pr_debug("nf_ct_h323: incomplete TPKT (fragmented?)\n");
203                 goto clear_out;
204         }
205 
206         /* This is the encapsulated data */
207         *data = tpkt + 4;
208         *datalen = tpktlen - 4;
209         *dataoff = tpktoff + 4;
210 
211       out:
212         /* Clear TPKT length */
213         info->tpkt_len[dir] = 0;
214         return 1;
215 
216       clear_out:
217         info->tpkt_len[dir] = 0;
218         return 0;
219 }
220 
221 static int get_h245_addr(struct nf_conn *ct, const unsigned char *data,
222                          H245_TransportAddress *taddr,
223                          union nf_inet_addr *addr, __be16 *port)
224 {
225         const unsigned char *p;
226         int len;
227 
228         if (taddr->choice != eH245_TransportAddress_unicastAddress)
229                 return 0;
230 
231         switch (taddr->unicastAddress.choice) {
232         case eUnicastAddress_iPAddress:
233                 if (nf_ct_l3num(ct) != AF_INET)
234                         return 0;
235                 p = data + taddr->unicastAddress.iPAddress.network;
236                 len = 4;
237                 break;
238         case eUnicastAddress_iP6Address:
239                 if (nf_ct_l3num(ct) != AF_INET6)
240                         return 0;
241                 p = data + taddr->unicastAddress.iP6Address.network;
242                 len = 16;
243                 break;
244         default:
245                 return 0;
246         }
247 
248         memcpy(addr, p, len);
249         memset((void *)addr + len, 0, sizeof(*addr) - len);
250         memcpy(port, p + len, sizeof(__be16));
251 
252         return 1;
253 }
254 
255 static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct,
256                            enum ip_conntrack_info ctinfo,
257                            unsigned int protoff,
258                            unsigned char **data, int dataoff,
259                            H245_TransportAddress *taddr)
260 {
261         int dir = CTINFO2DIR(ctinfo);
262         int ret = 0;
263         __be16 port;
264         __be16 rtp_port, rtcp_port;
265         union nf_inet_addr addr;
266         struct nf_conntrack_expect *rtp_exp;
267         struct nf_conntrack_expect *rtcp_exp;
268         typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp;
269 
270         /* Read RTP or RTCP address */
271         if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
272             memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
273             port == 0)
274                 return 0;
275 
276         /* RTP port is even */
277         rtp_port = port & ~htons(1);
278         rtcp_port = port | htons(1);
279 
280         /* Create expect for RTP */
281         if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL)
282                 return -1;
283         nf_ct_expect_init(rtp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
284                           &ct->tuplehash[!dir].tuple.src.u3,
285                           &ct->tuplehash[!dir].tuple.dst.u3,
286                           IPPROTO_UDP, NULL, &rtp_port);
287 
288         /* Create expect for RTCP */
289         if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) {
290                 nf_ct_expect_put(rtp_exp);
291                 return -1;
292         }
293         nf_ct_expect_init(rtcp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
294                           &ct->tuplehash[!dir].tuple.src.u3,
295                           &ct->tuplehash[!dir].tuple.dst.u3,
296                           IPPROTO_UDP, NULL, &rtcp_port);
297 
298         if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
299                    &ct->tuplehash[!dir].tuple.dst.u3,
300                    sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
301                    (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) &&
302                    nf_ct_l3num(ct) == NFPROTO_IPV4 &&
303                    ct->status & IPS_NAT_MASK) {
304                 /* NAT needed */
305                 ret = nat_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
306                                    taddr, port, rtp_port, rtp_exp, rtcp_exp);
307         } else {                /* Conntrack only */
308                 if (nf_ct_expect_related(rtp_exp, 0) == 0) {
309                         if (nf_ct_expect_related(rtcp_exp, 0) == 0) {
310                                 pr_debug("nf_ct_h323: expect RTP ");
311                                 nf_ct_dump_tuple(&rtp_exp->tuple);
312                                 pr_debug("nf_ct_h323: expect RTCP ");
313                                 nf_ct_dump_tuple(&rtcp_exp->tuple);
314                         } else {
315                                 nf_ct_unexpect_related(rtp_exp);
316                                 ret = -1;
317                         }
318                 } else
319                         ret = -1;
320         }
321 
322         nf_ct_expect_put(rtp_exp);
323         nf_ct_expect_put(rtcp_exp);
324 
325         return ret;
326 }
327 
328 static int expect_t120(struct sk_buff *skb,
329                        struct nf_conn *ct,
330                        enum ip_conntrack_info ctinfo,
331                        unsigned int protoff,
332                        unsigned char **data, int dataoff,
333                        H245_TransportAddress *taddr)
334 {
335         int dir = CTINFO2DIR(ctinfo);
336         int ret = 0;
337         __be16 port;
338         union nf_inet_addr addr;
339         struct nf_conntrack_expect *exp;
340         typeof(nat_t120_hook) nat_t120;
341 
342         /* Read T.120 address */
343         if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
344             memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
345             port == 0)
346                 return 0;
347 
348         /* Create expect for T.120 connections */
349         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
350                 return -1;
351         nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
352                           &ct->tuplehash[!dir].tuple.src.u3,
353                           &ct->tuplehash[!dir].tuple.dst.u3,
354                           IPPROTO_TCP, NULL, &port);
355         exp->flags = NF_CT_EXPECT_PERMANENT;    /* Accept multiple channels */
356 
357         if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
358                    &ct->tuplehash[!dir].tuple.dst.u3,
359                    sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
360             (nat_t120 = rcu_dereference(nat_t120_hook)) &&
361             nf_ct_l3num(ct) == NFPROTO_IPV4 &&
362             ct->status & IPS_NAT_MASK) {
363                 /* NAT needed */
364                 ret = nat_t120(skb, ct, ctinfo, protoff, data, dataoff, taddr,
365                                port, exp);
366         } else {                /* Conntrack only */
367                 if (nf_ct_expect_related(exp, 0) == 0) {
368                         pr_debug("nf_ct_h323: expect T.120 ");
369                         nf_ct_dump_tuple(&exp->tuple);
370                 } else
371                         ret = -1;
372         }
373 
374         nf_ct_expect_put(exp);
375 
376         return ret;
377 }
378 
379 static int process_h245_channel(struct sk_buff *skb,
380                                 struct nf_conn *ct,
381                                 enum ip_conntrack_info ctinfo,
382                                 unsigned int protoff,
383                                 unsigned char **data, int dataoff,
384                                 H2250LogicalChannelParameters *channel)
385 {
386         int ret;
387 
388         if (channel->options & eH2250LogicalChannelParameters_mediaChannel) {
389                 /* RTP */
390                 ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
391                                       &channel->mediaChannel);
392                 if (ret < 0)
393                         return -1;
394         }
395 
396         if (channel->
397             options & eH2250LogicalChannelParameters_mediaControlChannel) {
398                 /* RTCP */
399                 ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
400                                       &channel->mediaControlChannel);
401                 if (ret < 0)
402                         return -1;
403         }
404 
405         return 0;
406 }
407 
408 static int process_olc(struct sk_buff *skb, struct nf_conn *ct,
409                        enum ip_conntrack_info ctinfo,
410                        unsigned int protoff,
411                        unsigned char **data, int dataoff,
412                        OpenLogicalChannel *olc)
413 {
414         int ret;
415 
416         pr_debug("nf_ct_h323: OpenLogicalChannel\n");
417 
418         if (olc->forwardLogicalChannelParameters.multiplexParameters.choice ==
419             eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)
420         {
421                 ret = process_h245_channel(skb, ct, ctinfo,
422                                            protoff, data, dataoff,
423                                            &olc->
424                                            forwardLogicalChannelParameters.
425                                            multiplexParameters.
426                                            h2250LogicalChannelParameters);
427                 if (ret < 0)
428                         return -1;
429         }
430 
431         if ((olc->options &
432              eOpenLogicalChannel_reverseLogicalChannelParameters) &&
433             (olc->reverseLogicalChannelParameters.options &
434              eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters)
435             && (olc->reverseLogicalChannelParameters.multiplexParameters.
436                 choice ==
437                 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
438         {
439                 ret =
440                     process_h245_channel(skb, ct, ctinfo,
441                                          protoff, data, dataoff,
442                                          &olc->
443                                          reverseLogicalChannelParameters.
444                                          multiplexParameters.
445                                          h2250LogicalChannelParameters);
446                 if (ret < 0)
447                         return -1;
448         }
449 
450         if ((olc->options & eOpenLogicalChannel_separateStack) &&
451             olc->forwardLogicalChannelParameters.dataType.choice ==
452             eDataType_data &&
453             olc->forwardLogicalChannelParameters.dataType.data.application.
454             choice == eDataApplicationCapability_application_t120 &&
455             olc->forwardLogicalChannelParameters.dataType.data.application.
456             t120.choice == eDataProtocolCapability_separateLANStack &&
457             olc->separateStack.networkAddress.choice ==
458             eNetworkAccessParameters_networkAddress_localAreaAddress) {
459                 ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff,
460                                   &olc->separateStack.networkAddress.
461                                   localAreaAddress);
462                 if (ret < 0)
463                         return -1;
464         }
465 
466         return 0;
467 }
468 
469 static int process_olca(struct sk_buff *skb, struct nf_conn *ct,
470                         enum ip_conntrack_info ctinfo,
471                         unsigned int protoff, unsigned char **data, int dataoff,
472                         OpenLogicalChannelAck *olca)
473 {
474         H2250LogicalChannelAckParameters *ack;
475         int ret;
476 
477         pr_debug("nf_ct_h323: OpenLogicalChannelAck\n");
478 
479         if ((olca->options &
480              eOpenLogicalChannelAck_reverseLogicalChannelParameters) &&
481             (olca->reverseLogicalChannelParameters.options &
482              eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters)
483             && (olca->reverseLogicalChannelParameters.multiplexParameters.
484                 choice ==
485                 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
486         {
487                 ret = process_h245_channel(skb, ct, ctinfo,
488                                            protoff, data, dataoff,
489                                            &olca->
490                                            reverseLogicalChannelParameters.
491                                            multiplexParameters.
492                                            h2250LogicalChannelParameters);
493                 if (ret < 0)
494                         return -1;
495         }
496 
497         if ((olca->options &
498              eOpenLogicalChannelAck_forwardMultiplexAckParameters) &&
499             (olca->forwardMultiplexAckParameters.choice ==
500              eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters))
501         {
502                 ack = &olca->forwardMultiplexAckParameters.
503                     h2250LogicalChannelAckParameters;
504                 if (ack->options &
505                     eH2250LogicalChannelAckParameters_mediaChannel) {
506                         /* RTP */
507                         ret = expect_rtp_rtcp(skb, ct, ctinfo,
508                                               protoff, data, dataoff,
509                                               &ack->mediaChannel);
510                         if (ret < 0)
511                                 return -1;
512                 }
513 
514                 if (ack->options &
515                     eH2250LogicalChannelAckParameters_mediaControlChannel) {
516                         /* RTCP */
517                         ret = expect_rtp_rtcp(skb, ct, ctinfo,
518                                               protoff, data, dataoff,
519                                               &ack->mediaControlChannel);
520                         if (ret < 0)
521                                 return -1;
522                 }
523         }
524 
525         if ((olca->options & eOpenLogicalChannelAck_separateStack) &&
526                 olca->separateStack.networkAddress.choice ==
527                 eNetworkAccessParameters_networkAddress_localAreaAddress) {
528                 ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff,
529                                   &olca->separateStack.networkAddress.
530                                   localAreaAddress);
531                 if (ret < 0)
532                         return -1;
533         }
534 
535         return 0;
536 }
537 
538 static int process_h245(struct sk_buff *skb, struct nf_conn *ct,
539                         enum ip_conntrack_info ctinfo,
540                         unsigned int protoff, unsigned char **data, int dataoff,
541                         MultimediaSystemControlMessage *mscm)
542 {
543         switch (mscm->choice) {
544         case eMultimediaSystemControlMessage_request:
545                 if (mscm->request.choice ==
546                     eRequestMessage_openLogicalChannel) {
547                         return process_olc(skb, ct, ctinfo,
548                                            protoff, data, dataoff,
549                                            &mscm->request.openLogicalChannel);
550                 }
551                 pr_debug("nf_ct_h323: H.245 Request %d\n",
552                          mscm->request.choice);
553                 break;
554         case eMultimediaSystemControlMessage_response:
555                 if (mscm->response.choice ==
556                     eResponseMessage_openLogicalChannelAck) {
557                         return process_olca(skb, ct, ctinfo,
558                                             protoff, data, dataoff,
559                                             &mscm->response.
560                                             openLogicalChannelAck);
561                 }
562                 pr_debug("nf_ct_h323: H.245 Response %d\n",
563                          mscm->response.choice);
564                 break;
565         default:
566                 pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice);
567                 break;
568         }
569 
570         return 0;
571 }
572 
573 static int h245_help(struct sk_buff *skb, unsigned int protoff,
574                      struct nf_conn *ct, enum ip_conntrack_info ctinfo)
575 {
576         static MultimediaSystemControlMessage mscm;
577         unsigned char *data = NULL;
578         int datalen;
579         int dataoff;
580         int ret;
581 
582         /* Until there's been traffic both ways, don't look in packets. */
583         if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
584                 return NF_ACCEPT;
585 
586         pr_debug("nf_ct_h245: skblen = %u\n", skb->len);
587 
588         spin_lock_bh(&nf_h323_lock);
589 
590         /* Process each TPKT */
591         while (get_tpkt_data(skb, protoff, ct, ctinfo,
592                              &data, &datalen, &dataoff)) {
593                 pr_debug("nf_ct_h245: TPKT len=%d ", datalen);
594                 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
595 
596                 /* Decode H.245 signal */
597                 ret = DecodeMultimediaSystemControlMessage(data, datalen,
598                                                            &mscm);
599                 if (ret < 0) {
600                         pr_debug("nf_ct_h245: decoding error: %s\n",
601                                  ret == H323_ERROR_BOUND ?
602                                  "out of bound" : "out of range");
603                         /* We don't drop when decoding error */
604                         break;
605                 }
606 
607                 /* Process H.245 signal */
608                 if (process_h245(skb, ct, ctinfo, protoff,
609                                  &data, dataoff, &mscm) < 0)
610                         goto drop;
611         }
612 
613         spin_unlock_bh(&nf_h323_lock);
614         return NF_ACCEPT;
615 
616       drop:
617         spin_unlock_bh(&nf_h323_lock);
618         nf_ct_helper_log(skb, ct, "cannot process H.245 message");
619         return NF_DROP;
620 }
621 
622 static const struct nf_conntrack_expect_policy h245_exp_policy = {
623         .max_expected   = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */,
624         .timeout        = 240,
625 };
626 
627 static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
628         .name                   = "H.245",
629         .me                     = THIS_MODULE,
630         .tuple.src.l3num        = AF_UNSPEC,
631         .tuple.dst.protonum     = IPPROTO_UDP,
632         .help                   = h245_help,
633         .expect_policy          = &h245_exp_policy,
634 };
635 
636 int get_h225_addr(struct nf_conn *ct, unsigned char *data,
637                   TransportAddress *taddr,
638                   union nf_inet_addr *addr, __be16 *port)
639 {
640         const unsigned char *p;
641         int len;
642 
643         switch (taddr->choice) {
644         case eTransportAddress_ipAddress:
645                 if (nf_ct_l3num(ct) != AF_INET)
646                         return 0;
647                 p = data + taddr->ipAddress.ip;
648                 len = 4;
649                 break;
650         case eTransportAddress_ip6Address:
651                 if (nf_ct_l3num(ct) != AF_INET6)
652                         return 0;
653                 p = data + taddr->ip6Address.ip;
654                 len = 16;
655                 break;
656         default:
657                 return 0;
658         }
659 
660         memcpy(addr, p, len);
661         memset((void *)addr + len, 0, sizeof(*addr) - len);
662         memcpy(port, p + len, sizeof(__be16));
663 
664         return 1;
665 }
666 
667 static int expect_h245(struct sk_buff *skb, struct nf_conn *ct,
668                        enum ip_conntrack_info ctinfo,
669                        unsigned int protoff, unsigned char **data, int dataoff,
670                        TransportAddress *taddr)
671 {
672         int dir = CTINFO2DIR(ctinfo);
673         int ret = 0;
674         __be16 port;
675         union nf_inet_addr addr;
676         struct nf_conntrack_expect *exp;
677         typeof(nat_h245_hook) nat_h245;
678 
679         /* Read h245Address */
680         if (!get_h225_addr(ct, *data, taddr, &addr, &port) ||
681             memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
682             port == 0)
683                 return 0;
684 
685         /* Create expect for h245 connection */
686         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
687                 return -1;
688         nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
689                           &ct->tuplehash[!dir].tuple.src.u3,
690                           &ct->tuplehash[!dir].tuple.dst.u3,
691                           IPPROTO_TCP, NULL, &port);
692         exp->helper = &nf_conntrack_helper_h245;
693 
694         if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
695                    &ct->tuplehash[!dir].tuple.dst.u3,
696                    sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
697             (nat_h245 = rcu_dereference(nat_h245_hook)) &&
698             nf_ct_l3num(ct) == NFPROTO_IPV4 &&
699             ct->status & IPS_NAT_MASK) {
700                 /* NAT needed */
701                 ret = nat_h245(skb, ct, ctinfo, protoff, data, dataoff, taddr,
702                                port, exp);
703         } else {                /* Conntrack only */
704                 if (nf_ct_expect_related(exp, 0) == 0) {
705                         pr_debug("nf_ct_q931: expect H.245 ");
706                         nf_ct_dump_tuple(&exp->tuple);
707                 } else
708                         ret = -1;
709         }
710 
711         nf_ct_expect_put(exp);
712 
713         return ret;
714 }
715 
716 /* If the calling party is on the same side of the forward-to party,
717  * we don't need to track the second call
718  */
719 static int callforward_do_filter(struct net *net,
720                                  const union nf_inet_addr *src,
721                                  const union nf_inet_addr *dst,
722                                  u_int8_t family)
723 {
724         int ret = 0;
725 
726         switch (family) {
727         case AF_INET: {
728                 struct flowi4 fl1, fl2;
729                 struct rtable *rt1, *rt2;
730 
731                 memset(&fl1, 0, sizeof(fl1));
732                 fl1.daddr = src->ip;
733 
734                 memset(&fl2, 0, sizeof(fl2));
735                 fl2.daddr = dst->ip;
736                 if (!nf_ip_route(net, (struct dst_entry **)&rt1,
737                                  flowi4_to_flowi(&fl1), false)) {
738                         if (!nf_ip_route(net, (struct dst_entry **)&rt2,
739                                          flowi4_to_flowi(&fl2), false)) {
740                                 if (rt_nexthop(rt1, fl1.daddr) ==
741                                     rt_nexthop(rt2, fl2.daddr) &&
742                                     rt1->dst.dev  == rt2->dst.dev)
743                                         ret = 1;
744                                 dst_release(&rt2->dst);
745                         }
746                         dst_release(&rt1->dst);
747                 }
748                 break;
749         }
750 #if IS_ENABLED(CONFIG_IPV6)
751         case AF_INET6: {
752                 struct rt6_info *rt1, *rt2;
753                 struct flowi6 fl1, fl2;
754 
755                 memset(&fl1, 0, sizeof(fl1));
756                 fl1.daddr = src->in6;
757 
758                 memset(&fl2, 0, sizeof(fl2));
759                 fl2.daddr = dst->in6;
760                 if (!nf_ip6_route(net, (struct dst_entry **)&rt1,
761                                   flowi6_to_flowi(&fl1), false)) {
762                         if (!nf_ip6_route(net, (struct dst_entry **)&rt2,
763                                           flowi6_to_flowi(&fl2), false)) {
764                                 if (ipv6_addr_equal(rt6_nexthop(rt1, &fl1.daddr),
765                                                     rt6_nexthop(rt2, &fl2.daddr)) &&
766                                     rt1->dst.dev == rt2->dst.dev)
767                                         ret = 1;
768                                 dst_release(&rt2->dst);
769                         }
770                         dst_release(&rt1->dst);
771                 }
772                 break;
773         }
774 #endif
775         }
776         return ret;
777 
778 }
779 
780 static int expect_callforwarding(struct sk_buff *skb,
781                                  struct nf_conn *ct,
782                                  enum ip_conntrack_info ctinfo,
783                                  unsigned int protoff,
784                                  unsigned char **data, int dataoff,
785                                  TransportAddress *taddr)
786 {
787         int dir = CTINFO2DIR(ctinfo);
788         int ret = 0;
789         __be16 port;
790         union nf_inet_addr addr;
791         struct nf_conntrack_expect *exp;
792         struct net *net = nf_ct_net(ct);
793         typeof(nat_callforwarding_hook) nat_callforwarding;
794 
795         /* Read alternativeAddress */
796         if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0)
797                 return 0;
798 
799         /* If the calling party is on the same side of the forward-to party,
800          * we don't need to track the second call
801          */
802         if (callforward_filter &&
803             callforward_do_filter(net, &addr, &ct->tuplehash[!dir].tuple.src.u3,
804                                   nf_ct_l3num(ct))) {
805                 pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
806                 return 0;
807         }
808 
809         /* Create expect for the second call leg */
810         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
811                 return -1;
812         nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
813                           &ct->tuplehash[!dir].tuple.src.u3, &addr,
814                           IPPROTO_TCP, NULL, &port);
815         exp->helper = nf_conntrack_helper_q931;
816 
817         if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
818                    &ct->tuplehash[!dir].tuple.dst.u3,
819                    sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
820             (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) &&
821             nf_ct_l3num(ct) == NFPROTO_IPV4 &&
822             ct->status & IPS_NAT_MASK) {
823                 /* Need NAT */
824                 ret = nat_callforwarding(skb, ct, ctinfo,
825                                          protoff, data, dataoff,
826                                          taddr, port, exp);
827         } else {                /* Conntrack only */
828                 if (nf_ct_expect_related(exp, 0) == 0) {
829                         pr_debug("nf_ct_q931: expect Call Forwarding ");
830                         nf_ct_dump_tuple(&exp->tuple);
831                 } else
832                         ret = -1;
833         }
834 
835         nf_ct_expect_put(exp);
836 
837         return ret;
838 }
839 
840 static int process_setup(struct sk_buff *skb, struct nf_conn *ct,
841                          enum ip_conntrack_info ctinfo,
842                          unsigned int protoff,
843                          unsigned char **data, int dataoff,
844                          Setup_UUIE *setup)
845 {
846         int dir = CTINFO2DIR(ctinfo);
847         int ret;
848         int i;
849         __be16 port;
850         union nf_inet_addr addr;
851         typeof(set_h225_addr_hook) set_h225_addr;
852 
853         pr_debug("nf_ct_q931: Setup\n");
854 
855         if (setup->options & eSetup_UUIE_h245Address) {
856                 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
857                                   &setup->h245Address);
858                 if (ret < 0)
859                         return -1;
860         }
861 
862         set_h225_addr = rcu_dereference(set_h225_addr_hook);
863         if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
864             (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
865             ct->status & IPS_NAT_MASK &&
866             get_h225_addr(ct, *data, &setup->destCallSignalAddress,
867                           &addr, &port) &&
868             memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
869                 pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n",
870                          &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3,
871                          ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
872                 ret = set_h225_addr(skb, protoff, data, dataoff,
873                                     &setup->destCallSignalAddress,
874                                     &ct->tuplehash[!dir].tuple.src.u3,
875                                     ct->tuplehash[!dir].tuple.src.u.tcp.port);
876                 if (ret < 0)
877                         return -1;
878         }
879 
880         if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
881             (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
882             ct->status & IPS_NAT_MASK &&
883             get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
884                           &addr, &port) &&
885             memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
886                 pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n",
887                          &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3,
888                          ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
889                 ret = set_h225_addr(skb, protoff, data, dataoff,
890                                     &setup->sourceCallSignalAddress,
891                                     &ct->tuplehash[!dir].tuple.dst.u3,
892                                     ct->tuplehash[!dir].tuple.dst.u.tcp.port);
893                 if (ret < 0)
894                         return -1;
895         }
896 
897         if (setup->options & eSetup_UUIE_fastStart) {
898                 for (i = 0; i < setup->fastStart.count; i++) {
899                         ret = process_olc(skb, ct, ctinfo,
900                                           protoff, data, dataoff,
901                                           &setup->fastStart.item[i]);
902                         if (ret < 0)
903                                 return -1;
904                 }
905         }
906 
907         return 0;
908 }
909 
910 static int process_callproceeding(struct sk_buff *skb,
911                                   struct nf_conn *ct,
912                                   enum ip_conntrack_info ctinfo,
913                                   unsigned int protoff,
914                                   unsigned char **data, int dataoff,
915                                   CallProceeding_UUIE *callproc)
916 {
917         int ret;
918         int i;
919 
920         pr_debug("nf_ct_q931: CallProceeding\n");
921 
922         if (callproc->options & eCallProceeding_UUIE_h245Address) {
923                 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
924                                   &callproc->h245Address);
925                 if (ret < 0)
926                         return -1;
927         }
928 
929         if (callproc->options & eCallProceeding_UUIE_fastStart) {
930                 for (i = 0; i < callproc->fastStart.count; i++) {
931                         ret = process_olc(skb, ct, ctinfo,
932                                           protoff, data, dataoff,
933                                           &callproc->fastStart.item[i]);
934                         if (ret < 0)
935                                 return -1;
936                 }
937         }
938 
939         return 0;
940 }
941 
942 static int process_connect(struct sk_buff *skb, struct nf_conn *ct,
943                            enum ip_conntrack_info ctinfo,
944                            unsigned int protoff,
945                            unsigned char **data, int dataoff,
946                            Connect_UUIE *connect)
947 {
948         int ret;
949         int i;
950 
951         pr_debug("nf_ct_q931: Connect\n");
952 
953         if (connect->options & eConnect_UUIE_h245Address) {
954                 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
955                                   &connect->h245Address);
956                 if (ret < 0)
957                         return -1;
958         }
959 
960         if (connect->options & eConnect_UUIE_fastStart) {
961                 for (i = 0; i < connect->fastStart.count; i++) {
962                         ret = process_olc(skb, ct, ctinfo,
963                                           protoff, data, dataoff,
964                                           &connect->fastStart.item[i]);
965                         if (ret < 0)
966                                 return -1;
967                 }
968         }
969 
970         return 0;
971 }
972 
973 static int process_alerting(struct sk_buff *skb, struct nf_conn *ct,
974                             enum ip_conntrack_info ctinfo,
975                             unsigned int protoff,
976                             unsigned char **data, int dataoff,
977                             Alerting_UUIE *alert)
978 {
979         int ret;
980         int i;
981 
982         pr_debug("nf_ct_q931: Alerting\n");
983 
984         if (alert->options & eAlerting_UUIE_h245Address) {
985                 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
986                                   &alert->h245Address);
987                 if (ret < 0)
988                         return -1;
989         }
990 
991         if (alert->options & eAlerting_UUIE_fastStart) {
992                 for (i = 0; i < alert->fastStart.count; i++) {
993                         ret = process_olc(skb, ct, ctinfo,
994                                           protoff, data, dataoff,
995                                           &alert->fastStart.item[i]);
996                         if (ret < 0)
997                                 return -1;
998                 }
999         }
1000 
1001         return 0;
1002 }
1003 
1004 static int process_facility(struct sk_buff *skb, struct nf_conn *ct,
1005                             enum ip_conntrack_info ctinfo,
1006                             unsigned int protoff,
1007                             unsigned char **data, int dataoff,
1008                             Facility_UUIE *facility)
1009 {
1010         int ret;
1011         int i;
1012 
1013         pr_debug("nf_ct_q931: Facility\n");
1014 
1015         if (facility->reason.choice == eFacilityReason_callForwarded) {
1016                 if (facility->options & eFacility_UUIE_alternativeAddress)
1017                         return expect_callforwarding(skb, ct, ctinfo,
1018                                                      protoff, data, dataoff,
1019                                                      &facility->
1020                                                      alternativeAddress);
1021                 return 0;
1022         }
1023 
1024         if (facility->options & eFacility_UUIE_h245Address) {
1025                 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
1026                                   &facility->h245Address);
1027                 if (ret < 0)
1028                         return -1;
1029         }
1030 
1031         if (facility->options & eFacility_UUIE_fastStart) {
1032                 for (i = 0; i < facility->fastStart.count; i++) {
1033                         ret = process_olc(skb, ct, ctinfo,
1034                                           protoff, data, dataoff,
1035                                           &facility->fastStart.item[i]);
1036                         if (ret < 0)
1037                                 return -1;
1038                 }
1039         }
1040 
1041         return 0;
1042 }
1043 
1044 static int process_progress(struct sk_buff *skb, struct nf_conn *ct,
1045                             enum ip_conntrack_info ctinfo,
1046                             unsigned int protoff,
1047                             unsigned char **data, int dataoff,
1048                             Progress_UUIE *progress)
1049 {
1050         int ret;
1051         int i;
1052 
1053         pr_debug("nf_ct_q931: Progress\n");
1054 
1055         if (progress->options & eProgress_UUIE_h245Address) {
1056                 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
1057                                   &progress->h245Address);
1058                 if (ret < 0)
1059                         return -1;
1060         }
1061 
1062         if (progress->options & eProgress_UUIE_fastStart) {
1063                 for (i = 0; i < progress->fastStart.count; i++) {
1064                         ret = process_olc(skb, ct, ctinfo,
1065                                           protoff, data, dataoff,
1066                                           &progress->fastStart.item[i]);
1067                         if (ret < 0)
1068                                 return -1;
1069                 }
1070         }
1071 
1072         return 0;
1073 }
1074 
1075 static int process_q931(struct sk_buff *skb, struct nf_conn *ct,
1076                         enum ip_conntrack_info ctinfo,
1077                         unsigned int protoff, unsigned char **data, int dataoff,
1078                         Q931 *q931)
1079 {
1080         H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
1081         int i;
1082         int ret = 0;
1083 
1084         switch (pdu->h323_message_body.choice) {
1085         case eH323_UU_PDU_h323_message_body_setup:
1086                 ret = process_setup(skb, ct, ctinfo, protoff, data, dataoff,
1087                                     &pdu->h323_message_body.setup);
1088                 break;
1089         case eH323_UU_PDU_h323_message_body_callProceeding:
1090                 ret = process_callproceeding(skb, ct, ctinfo,
1091                                              protoff, data, dataoff,
1092                                              &pdu->h323_message_body.
1093                                              callProceeding);
1094                 break;
1095         case eH323_UU_PDU_h323_message_body_connect:
1096                 ret = process_connect(skb, ct, ctinfo, protoff, data, dataoff,
1097                                       &pdu->h323_message_body.connect);
1098                 break;
1099         case eH323_UU_PDU_h323_message_body_alerting:
1100                 ret = process_alerting(skb, ct, ctinfo, protoff, data, dataoff,
1101                                        &pdu->h323_message_body.alerting);
1102                 break;
1103         case eH323_UU_PDU_h323_message_body_facility:
1104                 ret = process_facility(skb, ct, ctinfo, protoff, data, dataoff,
1105                                        &pdu->h323_message_body.facility);
1106                 break;
1107         case eH323_UU_PDU_h323_message_body_progress:
1108                 ret = process_progress(skb, ct, ctinfo, protoff, data, dataoff,
1109                                        &pdu->h323_message_body.progress);
1110                 break;
1111         default:
1112                 pr_debug("nf_ct_q931: Q.931 signal %d\n",
1113                          pdu->h323_message_body.choice);
1114                 break;
1115         }
1116 
1117         if (ret < 0)
1118                 return -1;
1119 
1120         if (pdu->options & eH323_UU_PDU_h245Control) {
1121                 for (i = 0; i < pdu->h245Control.count; i++) {
1122                         ret = process_h245(skb, ct, ctinfo,
1123                                            protoff, data, dataoff,
1124                                            &pdu->h245Control.item[i]);
1125                         if (ret < 0)
1126                                 return -1;
1127                 }
1128         }
1129 
1130         return 0;
1131 }
1132 
1133 static int q931_help(struct sk_buff *skb, unsigned int protoff,
1134                      struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1135 {
1136         static Q931 q931;
1137         unsigned char *data = NULL;
1138         int datalen;
1139         int dataoff;
1140         int ret;
1141 
1142         /* Until there's been traffic both ways, don't look in packets. */
1143         if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
1144                 return NF_ACCEPT;
1145 
1146         pr_debug("nf_ct_q931: skblen = %u\n", skb->len);
1147 
1148         spin_lock_bh(&nf_h323_lock);
1149 
1150         /* Process each TPKT */
1151         while (get_tpkt_data(skb, protoff, ct, ctinfo,
1152                              &data, &datalen, &dataoff)) {
1153                 pr_debug("nf_ct_q931: TPKT len=%d ", datalen);
1154                 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1155 
1156                 /* Decode Q.931 signal */
1157                 ret = DecodeQ931(data, datalen, &q931);
1158                 if (ret < 0) {
1159                         pr_debug("nf_ct_q931: decoding error: %s\n",
1160                                  ret == H323_ERROR_BOUND ?
1161                                  "out of bound" : "out of range");
1162                         /* We don't drop when decoding error */
1163                         break;
1164                 }
1165 
1166                 /* Process Q.931 signal */
1167                 if (process_q931(skb, ct, ctinfo, protoff,
1168                                  &data, dataoff, &q931) < 0)
1169                         goto drop;
1170         }
1171 
1172         spin_unlock_bh(&nf_h323_lock);
1173         return NF_ACCEPT;
1174 
1175       drop:
1176         spin_unlock_bh(&nf_h323_lock);
1177         nf_ct_helper_log(skb, ct, "cannot process Q.931 message");
1178         return NF_DROP;
1179 }
1180 
1181 static const struct nf_conntrack_expect_policy q931_exp_policy = {
1182         /* T.120 and H.245 */
1183         .max_expected           = H323_RTP_CHANNEL_MAX * 4 + 4,
1184         .timeout                = 240,
1185 };
1186 
1187 static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
1188         {
1189                 .name                   = "Q.931",
1190                 .me                     = THIS_MODULE,
1191                 .tuple.src.l3num        = AF_INET,
1192                 .tuple.src.u.tcp.port   = cpu_to_be16(Q931_PORT),
1193                 .tuple.dst.protonum     = IPPROTO_TCP,
1194                 .help                   = q931_help,
1195                 .expect_policy          = &q931_exp_policy,
1196         },
1197         {
1198                 .name                   = "Q.931",
1199                 .me                     = THIS_MODULE,
1200                 .tuple.src.l3num        = AF_INET6,
1201                 .tuple.src.u.tcp.port   = cpu_to_be16(Q931_PORT),
1202                 .tuple.dst.protonum     = IPPROTO_TCP,
1203                 .help                   = q931_help,
1204                 .expect_policy          = &q931_exp_policy,
1205         },
1206 };
1207 
1208 static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff,
1209                                    int *datalen)
1210 {
1211         const struct udphdr *uh;
1212         struct udphdr _uh;
1213         int dataoff;
1214 
1215         uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh);
1216         if (uh == NULL)
1217                 return NULL;
1218         dataoff = protoff + sizeof(_uh);
1219         if (dataoff >= skb->len)
1220                 return NULL;
1221         *datalen = skb->len - dataoff;
1222         return skb_header_pointer(skb, dataoff, *datalen, h323_buffer);
1223 }
1224 
1225 static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
1226                                                union nf_inet_addr *addr,
1227                                                __be16 port)
1228 {
1229         struct net *net = nf_ct_net(ct);
1230         struct nf_conntrack_expect *exp;
1231         struct nf_conntrack_tuple tuple;
1232 
1233         memset(&tuple.src.u3, 0, sizeof(tuple.src.u3));
1234         tuple.src.u.tcp.port = 0;
1235         memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3));
1236         tuple.dst.u.tcp.port = port;
1237         tuple.dst.protonum = IPPROTO_TCP;
1238 
1239         exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple);
1240         if (exp && exp->master == ct)
1241                 return exp;
1242         return NULL;
1243 }
1244 
1245 static int expect_q931(struct sk_buff *skb, struct nf_conn *ct,
1246                        enum ip_conntrack_info ctinfo,
1247                        unsigned int protoff, unsigned char **data,
1248                        TransportAddress *taddr, int count)
1249 {
1250         struct nf_ct_h323_master *info = nfct_help_data(ct);
1251         int dir = CTINFO2DIR(ctinfo);
1252         int ret = 0;
1253         int i;
1254         __be16 port;
1255         union nf_inet_addr addr;
1256         struct nf_conntrack_expect *exp;
1257         typeof(nat_q931_hook) nat_q931;
1258 
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)
1264                         break;
1265         }
1266 
1267         if (i >= count)         /* Not found */
1268                 return 0;
1269 
1270         /* Create expect for Q.931 */
1271         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1272                 return -1;
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 */
1280 
1281         nat_q931 = rcu_dereference(nat_q931_hook);
1282         if (nat_q931 && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1283             ct->status & IPS_NAT_MASK) {        /* Need NAT */
1284                 ret = nat_q931(skb, ct, ctinfo, protoff, data,
1285                                taddr, i, port, exp);
1286         } else {                /* Conntrack only */
1287                 if (nf_ct_expect_related(exp, 0) == 0) {
1288                         pr_debug("nf_ct_ras: expect Q.931 ");
1289                         nf_ct_dump_tuple(&exp->tuple);
1290 
1291                         /* Save port for looking up expect in processing RCF */
1292                         info->sig_port[dir] = port;
1293                 } else
1294                         ret = -1;
1295         }
1296 
1297         nf_ct_expect_put(exp);
1298 
1299         return ret;
1300 }
1301 
1302 static int process_grq(struct sk_buff *skb, struct nf_conn *ct,
1303                        enum ip_conntrack_info ctinfo,
1304                        unsigned int protoff,
1305                        unsigned char **data, GatekeeperRequest *grq)
1306 {
1307         typeof(set_ras_addr_hook) set_ras_addr;
1308 
1309         pr_debug("nf_ct_ras: GRQ\n");
1310 
1311         set_ras_addr = rcu_dereference(set_ras_addr_hook);
1312         if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1313             ct->status & IPS_NAT_MASK)  /* NATed */
1314                 return set_ras_addr(skb, ct, ctinfo, protoff, data,
1315                                     &grq->rasAddress, 1);
1316         return 0;
1317 }
1318 
1319 static int process_gcf(struct sk_buff *skb, struct nf_conn *ct,
1320                        enum ip_conntrack_info ctinfo,
1321                        unsigned int protoff,
1322                        unsigned char **data, GatekeeperConfirm *gcf)
1323 {
1324         int dir = CTINFO2DIR(ctinfo);
1325         int ret = 0;
1326         __be16 port;
1327         union nf_inet_addr addr;
1328         struct nf_conntrack_expect *exp;
1329 
1330         pr_debug("nf_ct_ras: GCF\n");
1331 
1332         if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port))
1333                 return 0;
1334 
1335         /* Registration port is the same as discovery port */
1336         if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1337             port == ct->tuplehash[dir].tuple.src.u.udp.port)
1338                 return 0;
1339 
1340         /* Avoid RAS expectation loops. A GCF is never expected. */
1341         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1342                 return 0;
1343 
1344         /* Need new expect */
1345         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1346                 return -1;
1347         nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1348                           &ct->tuplehash[!dir].tuple.src.u3, &addr,
1349                           IPPROTO_UDP, NULL, &port);
1350         exp->helper = nf_conntrack_helper_ras;
1351 
1352         if (nf_ct_expect_related(exp, 0) == 0) {
1353                 pr_debug("nf_ct_ras: expect RAS ");
1354                 nf_ct_dump_tuple(&exp->tuple);
1355         } else
1356                 ret = -1;
1357 
1358         nf_ct_expect_put(exp);
1359 
1360         return ret;
1361 }
1362 
1363 static int process_rrq(struct sk_buff *skb, struct nf_conn *ct,
1364                        enum ip_conntrack_info ctinfo,
1365                        unsigned int protoff,
1366                        unsigned char **data, RegistrationRequest *rrq)
1367 {
1368         struct nf_ct_h323_master *info = nfct_help_data(ct);
1369         int ret;
1370         typeof(set_ras_addr_hook) set_ras_addr;
1371 
1372         pr_debug("nf_ct_ras: RRQ\n");
1373 
1374         ret = expect_q931(skb, ct, ctinfo, protoff, data,
1375                           rrq->callSignalAddress.item,
1376                           rrq->callSignalAddress.count);
1377         if (ret < 0)
1378                 return -1;
1379 
1380         set_ras_addr = rcu_dereference(set_ras_addr_hook);
1381         if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1382             ct->status & IPS_NAT_MASK) {
1383                 ret = set_ras_addr(skb, ct, ctinfo, protoff, data,
1384                                    rrq->rasAddress.item,
1385                                    rrq->rasAddress.count);
1386                 if (ret < 0)
1387                         return -1;
1388         }
1389 
1390         if (rrq->options & eRegistrationRequest_timeToLive) {
1391                 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
1392                 info->timeout = rrq->timeToLive;
1393         } else
1394                 info->timeout = default_rrq_ttl;
1395 
1396         return 0;
1397 }
1398 
1399 static int process_rcf(struct sk_buff *skb, struct nf_conn *ct,
1400                        enum ip_conntrack_info ctinfo,
1401                        unsigned int protoff,
1402                        unsigned char **data, RegistrationConfirm *rcf)
1403 {
1404         struct nf_ct_h323_master *info = nfct_help_data(ct);
1405         int dir = CTINFO2DIR(ctinfo);
1406         int ret;
1407         struct nf_conntrack_expect *exp;
1408         typeof(set_sig_addr_hook) set_sig_addr;
1409 
1410         pr_debug("nf_ct_ras: RCF\n");
1411 
1412         set_sig_addr = rcu_dereference(set_sig_addr_hook);
1413         if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1414             ct->status & IPS_NAT_MASK) {
1415                 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
1416                                         rcf->callSignalAddress.item,
1417                                         rcf->callSignalAddress.count);
1418                 if (ret < 0)
1419                         return -1;
1420         }
1421 
1422         if (rcf->options & eRegistrationConfirm_timeToLive) {
1423                 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
1424                 info->timeout = rcf->timeToLive;
1425         }
1426 
1427         if (info->timeout > 0) {
1428                 pr_debug("nf_ct_ras: set RAS connection timeout to "
1429                          "%u seconds\n", info->timeout);
1430                 nf_ct_refresh(ct, skb, info->timeout * HZ);
1431 
1432                 /* Set expect timeout */
1433                 spin_lock_bh(&nf_conntrack_expect_lock);
1434                 exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
1435                                   info->sig_port[!dir]);
1436                 if (exp) {
1437                         pr_debug("nf_ct_ras: set Q.931 expect "
1438                                  "timeout to %u seconds for",
1439                                  info->timeout);
1440                         nf_ct_dump_tuple(&exp->tuple);
1441                         mod_timer_pending(&exp->timeout,
1442                                           jiffies + info->timeout * HZ);
1443                 }
1444                 spin_unlock_bh(&nf_conntrack_expect_lock);
1445         }
1446 
1447         return 0;
1448 }
1449 
1450 static int process_urq(struct sk_buff *skb, struct nf_conn *ct,
1451                        enum ip_conntrack_info ctinfo,
1452                        unsigned int protoff,
1453                        unsigned char **data, UnregistrationRequest *urq)
1454 {
1455         struct nf_ct_h323_master *info = nfct_help_data(ct);
1456         int dir = CTINFO2DIR(ctinfo);
1457         int ret;
1458         typeof(set_sig_addr_hook) set_sig_addr;
1459 
1460         pr_debug("nf_ct_ras: URQ\n");
1461 
1462         set_sig_addr = rcu_dereference(set_sig_addr_hook);
1463         if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1464             ct->status & IPS_NAT_MASK) {
1465                 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
1466                                    urq->callSignalAddress.item,
1467                                    urq->callSignalAddress.count);
1468                 if (ret < 0)
1469                         return -1;
1470         }
1471 
1472         /* Clear old expect */
1473         nf_ct_remove_expectations(ct);
1474         info->sig_port[dir] = 0;
1475         info->sig_port[!dir] = 0;
1476 
1477         /* Give it 30 seconds for UCF or URJ */
1478         nf_ct_refresh(ct, skb, 30 * HZ);
1479 
1480         return 0;
1481 }
1482 
1483 static int process_arq(struct sk_buff *skb, struct nf_conn *ct,
1484                        enum ip_conntrack_info ctinfo,
1485                        unsigned int protoff,
1486                        unsigned char **data, AdmissionRequest *arq)
1487 {
1488         const struct nf_ct_h323_master *info = nfct_help_data(ct);
1489         int dir = CTINFO2DIR(ctinfo);
1490         __be16 port;
1491         union nf_inet_addr addr;
1492         typeof(set_h225_addr_hook) set_h225_addr;
1493 
1494         pr_debug("nf_ct_ras: ARQ\n");
1495 
1496         set_h225_addr = rcu_dereference(set_h225_addr_hook);
1497         if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
1498             get_h225_addr(ct, *data, &arq->destCallSignalAddress,
1499                           &addr, &port) &&
1500             !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1501             port == info->sig_port[dir] &&
1502             nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1503             set_h225_addr && ct->status & IPS_NAT_MASK) {
1504                 /* Answering ARQ */
1505                 return set_h225_addr(skb, protoff, data, 0,
1506                                      &arq->destCallSignalAddress,
1507                                      &ct->tuplehash[!dir].tuple.dst.u3,
1508                                      info->sig_port[!dir]);
1509         }
1510 
1511         if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
1512             get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
1513                           &addr, &port) &&
1514             !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1515             set_h225_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1516             ct->status & IPS_NAT_MASK) {
1517                 /* Calling ARQ */
1518                 return set_h225_addr(skb, protoff, data, 0,
1519                                      &arq->srcCallSignalAddress,
1520                                      &ct->tuplehash[!dir].tuple.dst.u3,
1521                                      port);
1522         }
1523 
1524         return 0;
1525 }
1526 
1527 static int process_acf(struct sk_buff *skb, struct nf_conn *ct,
1528                        enum ip_conntrack_info ctinfo,
1529                        unsigned int protoff,
1530                        unsigned char **data, AdmissionConfirm *acf)
1531 {
1532         int dir = CTINFO2DIR(ctinfo);
1533         int ret = 0;
1534         __be16 port;
1535         union nf_inet_addr addr;
1536         struct nf_conntrack_expect *exp;
1537         typeof(set_sig_addr_hook) set_sig_addr;
1538 
1539         pr_debug("nf_ct_ras: ACF\n");
1540 
1541         if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
1542                            &addr, &port))
1543                 return 0;
1544 
1545         if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
1546                 /* Answering ACF */
1547                 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1548                 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1549                     ct->status & IPS_NAT_MASK)
1550                         return set_sig_addr(skb, ct, ctinfo, protoff, data,
1551                                             &acf->destCallSignalAddress, 1);
1552                 return 0;
1553         }
1554 
1555         /* Need new expect */
1556         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1557                 return -1;
1558         nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1559                           &ct->tuplehash[!dir].tuple.src.u3, &addr,
1560                           IPPROTO_TCP, NULL, &port);
1561         exp->flags = NF_CT_EXPECT_PERMANENT;
1562         exp->helper = nf_conntrack_helper_q931;
1563 
1564         if (nf_ct_expect_related(exp, 0) == 0) {
1565                 pr_debug("nf_ct_ras: expect Q.931 ");
1566                 nf_ct_dump_tuple(&exp->tuple);
1567         } else
1568                 ret = -1;
1569 
1570         nf_ct_expect_put(exp);
1571 
1572         return ret;
1573 }
1574 
1575 static int process_lrq(struct sk_buff *skb, struct nf_conn *ct,
1576                        enum ip_conntrack_info ctinfo,
1577                        unsigned int protoff,
1578                        unsigned char **data, LocationRequest *lrq)
1579 {
1580         typeof(set_ras_addr_hook) set_ras_addr;
1581 
1582         pr_debug("nf_ct_ras: LRQ\n");
1583 
1584         set_ras_addr = rcu_dereference(set_ras_addr_hook);
1585         if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1586             ct->status & IPS_NAT_MASK)
1587                 return set_ras_addr(skb, ct, ctinfo, protoff, data,
1588                                     &lrq->replyAddress, 1);
1589         return 0;
1590 }
1591 
1592 static int process_lcf(struct sk_buff *skb, struct nf_conn *ct,
1593                        enum ip_conntrack_info ctinfo,
1594                        unsigned int protoff,
1595                        unsigned char **data, LocationConfirm *lcf)
1596 {
1597         int dir = CTINFO2DIR(ctinfo);
1598         int ret = 0;
1599         __be16 port;
1600         union nf_inet_addr addr;
1601         struct nf_conntrack_expect *exp;
1602 
1603         pr_debug("nf_ct_ras: LCF\n");
1604 
1605         if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
1606                            &addr, &port))
1607                 return 0;
1608 
1609         /* Need new expect for call signal */
1610         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1611                 return -1;
1612         nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1613                           &ct->tuplehash[!dir].tuple.src.u3, &addr,
1614                           IPPROTO_TCP, NULL, &port);
1615         exp->flags = NF_CT_EXPECT_PERMANENT;
1616         exp->helper = nf_conntrack_helper_q931;
1617 
1618         if (nf_ct_expect_related(exp, 0) == 0) {
1619                 pr_debug("nf_ct_ras: expect Q.931 ");
1620                 nf_ct_dump_tuple(&exp->tuple);
1621         } else
1622                 ret = -1;
1623 
1624         nf_ct_expect_put(exp);
1625 
1626         /* Ignore rasAddress */
1627 
1628         return ret;
1629 }
1630 
1631 static int process_irr(struct sk_buff *skb, struct nf_conn *ct,
1632                        enum ip_conntrack_info ctinfo,
1633                        unsigned int protoff,
1634                        unsigned char **data, InfoRequestResponse *irr)
1635 {
1636         int ret;
1637         typeof(set_ras_addr_hook) set_ras_addr;
1638         typeof(set_sig_addr_hook) set_sig_addr;
1639 
1640         pr_debug("nf_ct_ras: IRR\n");
1641 
1642         set_ras_addr = rcu_dereference(set_ras_addr_hook);
1643         if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1644             ct->status & IPS_NAT_MASK) {
1645                 ret = set_ras_addr(skb, ct, ctinfo, protoff, data,
1646                                    &irr->rasAddress, 1);
1647                 if (ret < 0)
1648                         return -1;
1649         }
1650 
1651         set_sig_addr = rcu_dereference(set_sig_addr_hook);
1652         if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1653             ct->status & IPS_NAT_MASK) {
1654                 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
1655                                         irr->callSignalAddress.item,
1656                                         irr->callSignalAddress.count);
1657                 if (ret < 0)
1658                         return -1;
1659         }
1660 
1661         return 0;
1662 }
1663 
1664 static int process_ras(struct sk_buff *skb, struct nf_conn *ct,
1665                        enum ip_conntrack_info ctinfo,
1666                        unsigned int protoff,
1667                        unsigned char **data, RasMessage *ras)
1668 {
1669         switch (ras->choice) {
1670         case eRasMessage_gatekeeperRequest:
1671                 return process_grq(skb, ct, ctinfo, protoff, data,
1672                                    &ras->gatekeeperRequest);
1673         case eRasMessage_gatekeeperConfirm:
1674                 return process_gcf(skb, ct, ctinfo, protoff, data,
1675                                    &ras->gatekeeperConfirm);
1676         case eRasMessage_registrationRequest:
1677                 return process_rrq(skb, ct, ctinfo, protoff, data,
1678                                    &ras->registrationRequest);
1679         case eRasMessage_registrationConfirm:
1680                 return process_rcf(skb, ct, ctinfo, protoff, data,
1681                                    &ras->registrationConfirm);
1682         case eRasMessage_unregistrationRequest:
1683                 return process_urq(skb, ct, ctinfo, protoff, data,
1684                                    &ras->unregistrationRequest);
1685         case eRasMessage_admissionRequest:
1686                 return process_arq(skb, ct, ctinfo, protoff, data,
1687                                    &ras->admissionRequest);
1688         case eRasMessage_admissionConfirm:
1689                 return process_acf(skb, ct, ctinfo, protoff, data,
1690                                    &ras->admissionConfirm);
1691         case eRasMessage_locationRequest:
1692                 return process_lrq(skb, ct, ctinfo, protoff, data,
1693                                    &ras->locationRequest);
1694         case eRasMessage_locationConfirm:
1695                 return process_lcf(skb, ct, ctinfo, protoff, data,
1696                                    &ras->locationConfirm);
1697         case eRasMessage_infoRequestResponse:
1698                 return process_irr(skb, ct, ctinfo, protoff, data,
1699                                    &ras->infoRequestResponse);
1700         default:
1701                 pr_debug("nf_ct_ras: RAS message %d\n", ras->choice);
1702                 break;
1703         }
1704 
1705         return 0;
1706 }
1707 
1708 static int ras_help(struct sk_buff *skb, unsigned int protoff,
1709                     struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1710 {
1711         static RasMessage ras;
1712         unsigned char *data;
1713         int datalen = 0;
1714         int ret;
1715 
1716         pr_debug("nf_ct_ras: skblen = %u\n", skb->len);
1717 
1718         spin_lock_bh(&nf_h323_lock);
1719 
1720         /* Get UDP data */
1721         data = get_udp_data(skb, protoff, &datalen);
1722         if (data == NULL)
1723                 goto accept;
1724         pr_debug("nf_ct_ras: RAS message len=%d ", datalen);
1725         nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1726 
1727         /* Decode RAS message */
1728         ret = DecodeRasMessage(data, datalen, &ras);
1729         if (ret < 0) {
1730                 pr_debug("nf_ct_ras: decoding error: %s\n",
1731                          ret == H323_ERROR_BOUND ?
1732                          "out of bound" : "out of range");
1733                 goto accept;
1734         }
1735 
1736         /* Process RAS message */
1737         if (process_ras(skb, ct, ctinfo, protoff, &data, &ras) < 0)
1738                 goto drop;
1739 
1740       accept:
1741         spin_unlock_bh(&nf_h323_lock);
1742         return NF_ACCEPT;
1743 
1744       drop:
1745         spin_unlock_bh(&nf_h323_lock);
1746         nf_ct_helper_log(skb, ct, "cannot process RAS message");
1747         return NF_DROP;
1748 }
1749 
1750 static const struct nf_conntrack_expect_policy ras_exp_policy = {
1751         .max_expected           = 32,
1752         .timeout                = 240,
1753 };
1754 
1755 static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
1756         {
1757                 .name                   = "RAS",
1758                 .me                     = THIS_MODULE,
1759                 .tuple.src.l3num        = AF_INET,
1760                 .tuple.src.u.udp.port   = cpu_to_be16(RAS_PORT),
1761                 .tuple.dst.protonum     = IPPROTO_UDP,
1762                 .help                   = ras_help,
1763                 .expect_policy          = &ras_exp_policy,
1764         },
1765         {
1766                 .name                   = "RAS",
1767                 .me                     = THIS_MODULE,
1768                 .tuple.src.l3num        = AF_INET6,
1769                 .tuple.src.u.udp.port   = cpu_to_be16(RAS_PORT),
1770                 .tuple.dst.protonum     = IPPROTO_UDP,
1771                 .help                   = ras_help,
1772                 .expect_policy          = &ras_exp_policy,
1773         },
1774 };
1775 
1776 static int __init h323_helper_init(void)
1777 {
1778         int ret;
1779 
1780         ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245);
1781         if (ret < 0)
1782                 return ret;
1783         ret = nf_conntrack_helpers_register(nf_conntrack_helper_q931,
1784                                         ARRAY_SIZE(nf_conntrack_helper_q931));
1785         if (ret < 0)
1786                 goto err1;
1787         ret = nf_conntrack_helpers_register(nf_conntrack_helper_ras,
1788                                         ARRAY_SIZE(nf_conntrack_helper_ras));
1789         if (ret < 0)
1790                 goto err2;
1791 
1792         return 0;
1793 err2:
1794         nf_conntrack_helpers_unregister(nf_conntrack_helper_q931,
1795                                         ARRAY_SIZE(nf_conntrack_helper_q931));
1796 err1:
1797         nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
1798         return ret;
1799 }
1800 
1801 static void __exit h323_helper_exit(void)
1802 {
1803         nf_conntrack_helpers_unregister(nf_conntrack_helper_ras,
1804                                         ARRAY_SIZE(nf_conntrack_helper_ras));
1805         nf_conntrack_helpers_unregister(nf_conntrack_helper_q931,
1806                                         ARRAY_SIZE(nf_conntrack_helper_q931));
1807         nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
1808 }
1809 
1810 static void __exit nf_conntrack_h323_fini(void)
1811 {
1812         h323_helper_exit();
1813         kfree(h323_buffer);
1814         pr_debug("nf_ct_h323: fini\n");
1815 }
1816 
1817 static int __init nf_conntrack_h323_init(void)
1818 {
1819         int ret;
1820 
1821         NF_CT_HELPER_BUILD_BUG_ON(sizeof(struct nf_ct_h323_master));
1822 
1823         h323_buffer = kmalloc(65536, GFP_KERNEL);
1824         if (!h323_buffer)
1825                 return -ENOMEM;
1826         ret = h323_helper_init();
1827         if (ret < 0)
1828                 goto err1;
1829         pr_debug("nf_ct_h323: init success\n");
1830         return 0;
1831 err1:
1832         kfree(h323_buffer);
1833         return ret;
1834 }
1835 
1836 module_init(nf_conntrack_h323_init);
1837 module_exit(nf_conntrack_h323_fini);
1838 
1839 EXPORT_SYMBOL_GPL(get_h225_addr);
1840 EXPORT_SYMBOL_GPL(set_h245_addr_hook);
1841 EXPORT_SYMBOL_GPL(set_h225_addr_hook);
1842 EXPORT_SYMBOL_GPL(set_sig_addr_hook);
1843 EXPORT_SYMBOL_GPL(set_ras_addr_hook);
1844 EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
1845 EXPORT_SYMBOL_GPL(nat_t120_hook);
1846 EXPORT_SYMBOL_GPL(nat_h245_hook);
1847 EXPORT_SYMBOL_GPL(nat_callforwarding_hook);
1848 EXPORT_SYMBOL_GPL(nat_q931_hook);
1849 
1850 MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1851 MODULE_DESCRIPTION("H.323 connection tracking helper");
1852 MODULE_LICENSE("GPL");
1853 MODULE_ALIAS("ip_conntrack_h323");
1854 MODULE_ALIAS_NFCT_HELPER("RAS");
1855 MODULE_ALIAS_NFCT_HELPER("Q.931");
1856 MODULE_ALIAS_NFCT_HELPER("H.245");
1857 

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