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   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 #if 0
  35 #define DEBUGP printk
  36 #else
  37 #define DEBUGP(format, args...)
  38 #endif
  39
  40 /* Parameters */
  41 static unsigned int default_rrq_ttl __read_mostly = 300;
  42 module_param(default_rrq_ttl, uint, 0600);
  43 MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ");
  44
  45 static int gkrouted_only __read_mostly = 1;
  46 module_param(gkrouted_only, int, 0600);
  47 MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper");
  48
  49 static int callforward_filter __read_mostly = 1;
  50 module_param(callforward_filter, bool, 0600);
  51 MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations "
  52                                      "if both endpoints are on different sides "
  53                                      "(determined by routing information)");
  54
  55 /* Hooks for NAT */
  56 int (*set_h245_addr_hook) (struct sk_buff **pskb,
  57                            unsigned char **data, int dataoff,
  58                            H245_TransportAddress *taddr,
  59                            union nf_conntrack_address *addr, __be16 port)
  60                            __read_mostly;
  61 int (*set_h225_addr_hook) (struct sk_buff **pskb,
  62                            unsigned char **data, int dataoff,
  63                            TransportAddress *taddr,
  64                            union nf_conntrack_address *addr, __be16 port)
  65                            __read_mostly;
  66 int (*set_sig_addr_hook) (struct sk_buff **pskb,
  67                           struct nf_conn *ct,
  68                           enum ip_conntrack_info ctinfo,
  69                           unsigned char **data,
  70                           TransportAddress *taddr, int count) __read_mostly;
  71 int (*set_ras_addr_hook) (struct sk_buff **pskb,
  72                           struct nf_conn *ct,
  73                           enum ip_conntrack_info ctinfo,
  74                           unsigned char **data,
  75                           TransportAddress *taddr, int count) __read_mostly;
  76 int (*nat_rtp_rtcp_hook) (struct sk_buff **pskb,
  77                           struct nf_conn *ct,
  78                           enum ip_conntrack_info ctinfo,
  79                           unsigned char **data, int dataoff,
  80                           H245_TransportAddress *taddr,
  81                           __be16 port, __be16 rtp_port,
  82                           struct nf_conntrack_expect *rtp_exp,
  83                           struct nf_conntrack_expect *rtcp_exp) __read_mostly;
  84 int (*nat_t120_hook) (struct sk_buff **pskb,
  85                       struct nf_conn *ct,
  86                       enum ip_conntrack_info ctinfo,
  87                       unsigned char **data, int dataoff,
  88                       H245_TransportAddress *taddr, __be16 port,
  89                       struct nf_conntrack_expect *exp) __read_mostly;
  90 int (*nat_h245_hook) (struct sk_buff **pskb,
  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_callforwarding_hook) (struct sk_buff **pskb,
  97                                 struct nf_conn *ct,
  98                                 enum ip_conntrack_info ctinfo,
  99                                 unsigned char **data, int dataoff,
 100                                 TransportAddress *taddr, __be16 port,
 101                                 struct nf_conntrack_expect *exp) __read_mostly;
 102 int (*nat_q931_hook) (struct sk_buff **pskb,
 103                       struct nf_conn *ct,
 104                       enum ip_conntrack_info ctinfo,
 105                       unsigned char **data, TransportAddress *taddr, int idx,
 106                       __be16 port, struct nf_conntrack_expect *exp)
 107                       __read_mostly;
 108
 109 static DEFINE_SPINLOCK(nf_h323_lock);
 110 static char *h323_buffer;
 111
 112 static struct nf_conntrack_helper nf_conntrack_helper_h245;
 113 static struct nf_conntrack_helper nf_conntrack_helper_q931[];
 114 static struct nf_conntrack_helper nf_conntrack_helper_ras[];
 115
 116 /****************************************************************************/
 117 static int get_tpkt_data(struct sk_buff **pskb, unsigned int protoff,
 118                          struct nf_conn *ct, enum ip_conntrack_info ctinfo,
 119                          unsigned char **data, int *datalen, int *dataoff)
 120 {
 121         struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
 122         int dir = CTINFO2DIR(ctinfo);
 123         struct tcphdr _tcph, *th;
 124         int tcpdatalen;
 125         int tcpdataoff;
 126         unsigned char *tpkt;
 127         int tpktlen;
 128         int tpktoff;
 129
 130         /* Get TCP header */
 131         th = skb_header_pointer(*pskb, protoff, sizeof(_tcph), &_tcph);
 132         if (th == NULL)
 133                 return 0;
 134
 135         /* Get TCP data offset */
 136         tcpdataoff = protoff + th->doff * 4;
 137
 138         /* Get TCP data length */
 139         tcpdatalen = (*pskb)->len - tcpdataoff;
 140         if (tcpdatalen <= 0)    /* No TCP data */
 141                 goto clear_out;
 142
 143         if (*data == NULL) {    /* first TPKT */
 144                 /* Get first TPKT pointer */
 145                 tpkt = skb_header_pointer(*pskb, tcpdataoff, tcpdatalen,
 146                                           h323_buffer);
 147                 BUG_ON(tpkt == NULL);
 148
 149                 /* Validate TPKT identifier */
 150                 if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) {
 151                         /* Netmeeting sends TPKT header and data separately */
 152                         if (info->tpkt_len[dir] > 0) {
 153                                 DEBUGP("nf_ct_h323: previous packet "
 154                                        "indicated separate TPKT data of %hu "
 155                                        "bytes\n", info->tpkt_len[dir]);
 156                                 if (info->tpkt_len[dir] <= tcpdatalen) {
 157                                         /* Yes, there was a TPKT header
 158                                          * received */
 159                                         *data = tpkt;
 160                                         *datalen = info->tpkt_len[dir];
 161                                         *dataoff = 0;
 162                                         goto out;
 163                                 }
 164
 165                                 /* Fragmented TPKT */
 166                                 DEBUGP("nf_ct_h323: fragmented TPKT\n");
 167                                 goto clear_out;
 168                         }
 169
 170                         /* It is not even a TPKT */
 171                         return 0;
 172                 }
 173                 tpktoff = 0;
 174         } else {                /* Next TPKT */
 175                 tpktoff = *dataoff + *datalen;
 176                 tcpdatalen -= tpktoff;
 177                 if (tcpdatalen <= 4)    /* No more TPKT */
 178                         goto clear_out;
 179                 tpkt = *data + *datalen;
 180
 181                 /* Validate TPKT identifier */
 182                 if (tpkt[0] != 0x03 || tpkt[1] != 0)
 183                         goto clear_out;
 184         }
 185
 186         /* Validate TPKT length */
 187         tpktlen = tpkt[2] * 256 + tpkt[3];
 188         if (tpktlen < 4)
 189                 goto clear_out;
 190         if (tpktlen > tcpdatalen) {
 191                 if (tcpdatalen == 4) {  /* Separate TPKT header */
 192                         /* Netmeeting sends TPKT header and data separately */
 193                         DEBUGP("nf_ct_h323: separate TPKT header indicates "
 194                                "there will be TPKT data of %hu bytes\n",
 195                                tpktlen - 4);
 196                         info->tpkt_len[dir] = tpktlen - 4;
 197                         return 0;
 198                 }
 199
 200                 if (net_ratelimit())
 201                         printk("nf_ct_h323: incomplete TPKT (fragmented?)\n");
 202                 goto clear_out;
 203         }
 204
 205         /* This is the encapsulated data */
 206         *data = tpkt + 4;
 207         *datalen = tpktlen - 4;
 208         *dataoff = tpktoff + 4;
 209
 210       out:
 211         /* Clear TPKT length */
 212         info->tpkt_len[dir] = 0;
 213         return 1;
 214
 215       clear_out:
 216         info->tpkt_len[dir] = 0;
 217         return 0;
 218 }
 219
 220 /****************************************************************************/
 221 static int get_h245_addr(struct nf_conn *ct, unsigned char *data,
 222                          H245_TransportAddress *taddr,
 223                          union nf_conntrack_address *addr, __be16 *port)
 224 {
 225         unsigned char *p;
 226         int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
 227         int len;
 228
 229         if (taddr->choice != eH245_TransportAddress_unicastAddress)
 230                 return 0;
 231
 232         switch (taddr->unicastAddress.choice) {
 233         case eUnicastAddress_iPAddress:
 234                 if (family != AF_INET)
 235                         return 0;
 236                 p = data + taddr->unicastAddress.iPAddress.network;
 237                 len = 4;
 238                 break;
 239         case eUnicastAddress_iP6Address:
 240                 if (family != AF_INET6)
 241                         return 0;
 242                 p = data + taddr->unicastAddress.iP6Address.network;
 243                 len = 16;
 244                 break;
 245         default:
 246                 return 0;
 247         }
 248
 249         memcpy(addr, p, len);
 250         memset((void *)addr + len, 0, sizeof(*addr) - len);
 251         memcpy(port, p + len, sizeof(__be16));
 252
 253         return 1;
 254 }
 255
 256 /****************************************************************************/
 257 static int expect_rtp_rtcp(struct sk_buff **pskb, struct nf_conn *ct,
 258                            enum ip_conntrack_info ctinfo,
 259                            unsigned char **data, int dataoff,
 260                            H245_TransportAddress *taddr)
 261 {
 262         int dir = CTINFO2DIR(ctinfo);
 263         int ret = 0;
 264         __be16 port;
 265         __be16 rtp_port, rtcp_port;
 266         union nf_conntrack_address addr;
 267         struct nf_conntrack_expect *rtp_exp;
 268         struct nf_conntrack_expect *rtcp_exp;
 269         typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp;
 270
 271         /* Read RTP or RTCP address */
 272         if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
 273             memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
 274             port == 0)
 275                 return 0;
 276
 277         /* RTP port is even */
 278         port &= htons(~1);
 279         rtp_port = port;
 280         rtcp_port = htons(ntohs(port) + 1);
 281
 282         /* Create expect for RTP */
 283         if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL)
 284                 return -1;
 285         nf_ct_expect_init(rtp_exp, ct->tuplehash[!dir].tuple.src.l3num,
 286                           &ct->tuplehash[!dir].tuple.src.u3,
 287                           &ct->tuplehash[!dir].tuple.dst.u3,
 288                           IPPROTO_UDP, NULL, &rtp_port);
 289
 290         /* Create expect for RTCP */
 291         if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) {
 292                 nf_ct_expect_put(rtp_exp);
 293                 return -1;
 294         }
 295         nf_ct_expect_init(rtcp_exp, ct->tuplehash[!dir].tuple.src.l3num,
 296                           &ct->tuplehash[!dir].tuple.src.u3,
 297                           &ct->tuplehash[!dir].tuple.dst.u3,
 298                           IPPROTO_UDP, NULL, &rtcp_port);
 299
 300         if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
 301                    &ct->tuplehash[!dir].tuple.dst.u3,
 302                    sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
 303                    (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) &&
 304                    ct->status & IPS_NAT_MASK) {
 305                 /* NAT needed */
 306                 ret = nat_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
 307                                    taddr, port, rtp_port, rtp_exp, rtcp_exp);
 308         } else {                /* Conntrack only */
 309                 if (nf_ct_expect_related(rtp_exp) == 0) {
 310                         if (nf_ct_expect_related(rtcp_exp) == 0) {
 311                                 DEBUGP("nf_ct_h323: expect RTP ");
 312                                 NF_CT_DUMP_TUPLE(&rtp_exp->tuple);
 313                                 DEBUGP("nf_ct_h323: expect RTCP ");
 314                                 NF_CT_DUMP_TUPLE(&rtcp_exp->tuple);
 315                         } else {
 316                                 nf_ct_unexpect_related(rtp_exp);
 317                                 ret = -1;
 318                         }
 319                 } else
 320                         ret = -1;
 321         }
 322
 323         nf_ct_expect_put(rtp_exp);
 324         nf_ct_expect_put(rtcp_exp);
 325
 326         return ret;
 327 }
 328
 329 /****************************************************************************/
 330 static int expect_t120(struct sk_buff **pskb,
 331                        struct nf_conn *ct,
 332                        enum ip_conntrack_info ctinfo,
 333                        unsigned char **data, int dataoff,
 334                        H245_TransportAddress *taddr)
 335 {
 336         int dir = CTINFO2DIR(ctinfo);
 337         int ret = 0;
 338         __be16 port;
 339         union nf_conntrack_address addr;
 340         struct nf_conntrack_expect *exp;
 341         typeof(nat_t120_hook) nat_t120;
 342
 343         /* Read T.120 address */
 344         if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
 345             memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
 346             port == 0)
 347                 return 0;
 348
 349         /* Create expect for T.120 connections */
 350         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
 351                 return -1;
 352         nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
 353                           &ct->tuplehash[!dir].tuple.src.u3,
 354                           &ct->tuplehash[!dir].tuple.dst.u3,
 355                           IPPROTO_TCP, NULL, &port);
 356         exp->flags = NF_CT_EXPECT_PERMANENT;    /* Accept multiple channels */
 357
 358         if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
 359                    &ct->tuplehash[!dir].tuple.dst.u3,
 360                    sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
 361             (nat_t120 = rcu_dereference(nat_t120_hook)) &&
 362             ct->status & IPS_NAT_MASK) {
 363                 /* NAT needed */
 364                 ret = nat_t120(pskb, ct, ctinfo, data, dataoff, taddr,
 365                                port, exp);
 366         } else {                /* Conntrack only */
 367                 if (nf_ct_expect_related(exp) == 0) {
 368                         DEBUGP("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 /****************************************************************************/
 380 static int process_h245_channel(struct sk_buff **pskb,
 381                                 struct nf_conn *ct,
 382                                 enum ip_conntrack_info ctinfo,
 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(pskb, ct, ctinfo, 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(pskb, ct, ctinfo, data, dataoff,
 400                                       &channel->mediaControlChannel);
 401                 if (ret < 0)
 402                         return -1;
 403         }
 404
 405         return 0;
 406 }
 407
 408 /****************************************************************************/
 409 static int process_olc(struct sk_buff **pskb, struct nf_conn *ct,
 410                        enum ip_conntrack_info ctinfo,
 411                        unsigned char **data, int dataoff,
 412                        OpenLogicalChannel *olc)
 413 {
 414         int ret;
 415
 416         DEBUGP("nf_ct_h323: OpenLogicalChannel\n");
 417
 418         if (olc->forwardLogicalChannelParameters.multiplexParameters.choice ==
 419             eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)
 420         {
 421                 ret = process_h245_channel(pskb, ct, ctinfo, data, dataoff,
 422                                            &olc->
 423                                            forwardLogicalChannelParameters.
 424                                            multiplexParameters.
 425                                            h2250LogicalChannelParameters);
 426                 if (ret < 0)
 427                         return -1;
 428         }
 429
 430         if ((olc->options &
 431              eOpenLogicalChannel_reverseLogicalChannelParameters) &&
 432             (olc->reverseLogicalChannelParameters.options &
 433              eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters)
 434             && (olc->reverseLogicalChannelParameters.multiplexParameters.
 435                 choice ==
 436                 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
 437         {
 438                 ret =
 439                     process_h245_channel(pskb, ct, ctinfo, data, dataoff,
 440                                          &olc->
 441                                          reverseLogicalChannelParameters.
 442                                          multiplexParameters.
 443                                          h2250LogicalChannelParameters);
 444                 if (ret < 0)
 445                         return -1;
 446         }
 447
 448         if ((olc->options & eOpenLogicalChannel_separateStack) &&
 449             olc->forwardLogicalChannelParameters.dataType.choice ==
 450             eDataType_data &&
 451             olc->forwardLogicalChannelParameters.dataType.data.application.
 452             choice == eDataApplicationCapability_application_t120 &&
 453             olc->forwardLogicalChannelParameters.dataType.data.application.
 454             t120.choice == eDataProtocolCapability_separateLANStack &&
 455             olc->separateStack.networkAddress.choice ==
 456             eNetworkAccessParameters_networkAddress_localAreaAddress) {
 457                 ret = expect_t120(pskb, ct, ctinfo, data, dataoff,
 458                                   &olc->separateStack.networkAddress.
 459                                   localAreaAddress);
 460                 if (ret < 0)
 461                         return -1;
 462         }
 463
 464         return 0;
 465 }
 466
 467 /****************************************************************************/
 468 static int process_olca(struct sk_buff **pskb, struct nf_conn *ct,
 469                         enum ip_conntrack_info ctinfo,
 470                         unsigned char **data, int dataoff,
 471                         OpenLogicalChannelAck *olca)
 472 {
 473         H2250LogicalChannelAckParameters *ack;
 474         int ret;
 475
 476         DEBUGP("nf_ct_h323: OpenLogicalChannelAck\n");
 477
 478         if ((olca->options &
 479              eOpenLogicalChannelAck_reverseLogicalChannelParameters) &&
 480             (olca->reverseLogicalChannelParameters.options &
 481              eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters)
 482             && (olca->reverseLogicalChannelParameters.multiplexParameters.
 483                 choice ==
 484                 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
 485         {
 486                 ret = process_h245_channel(pskb, ct, ctinfo, data, dataoff,
 487                                            &olca->
 488                                            reverseLogicalChannelParameters.
 489                                            multiplexParameters.
 490                                            h2250LogicalChannelParameters);
 491                 if (ret < 0)
 492                         return -1;
 493         }
 494
 495         if ((olca->options &
 496              eOpenLogicalChannelAck_forwardMultiplexAckParameters) &&
 497             (olca->forwardMultiplexAckParameters.choice ==
 498              eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters))
 499         {
 500                 ack = &olca->forwardMultiplexAckParameters.
 501                     h2250LogicalChannelAckParameters;
 502                 if (ack->options &
 503                     eH2250LogicalChannelAckParameters_mediaChannel) {
 504                         /* RTP */
 505                         ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
 506                                               &ack->mediaChannel);
 507                         if (ret < 0)
 508                                 return -1;
 509                 }
 510
 511                 if (ack->options &
 512                     eH2250LogicalChannelAckParameters_mediaControlChannel) {
 513                         /* RTCP */
 514                         ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
 515                                               &ack->mediaControlChannel);
 516                         if (ret < 0)
 517                                 return -1;
 518                 }
 519         }
 520
 521         if ((olca->options & eOpenLogicalChannelAck_separateStack) &&
 522                 olca->separateStack.networkAddress.choice ==
 523                 eNetworkAccessParameters_networkAddress_localAreaAddress) {
 524                 ret = expect_t120(pskb, ct, ctinfo, data, dataoff,
 525                                   &olca->separateStack.networkAddress.
 526                                   localAreaAddress);
 527                 if (ret < 0)
 528                         return -1;
 529         }
 530
 531         return 0;
 532 }
 533
 534 /****************************************************************************/
 535 static int process_h245(struct sk_buff **pskb, struct nf_conn *ct,
 536                         enum ip_conntrack_info ctinfo,
 537                         unsigned char **data, int dataoff,
 538                         MultimediaSystemControlMessage *mscm)
 539 {
 540         switch (mscm->choice) {
 541         case eMultimediaSystemControlMessage_request:
 542                 if (mscm->request.choice ==
 543                     eRequestMessage_openLogicalChannel) {
 544                         return process_olc(pskb, ct, ctinfo, data, dataoff,
 545                                            &mscm->request.openLogicalChannel);
 546                 }
 547                 DEBUGP("nf_ct_h323: H.245 Request %d\n",
 548                        mscm->request.choice);
 549                 break;
 550         case eMultimediaSystemControlMessage_response:
 551                 if (mscm->response.choice ==
 552                     eResponseMessage_openLogicalChannelAck) {
 553                         return process_olca(pskb, ct, ctinfo, data, dataoff,
 554                                             &mscm->response.
 555                                             openLogicalChannelAck);
 556                 }
 557                 DEBUGP("nf_ct_h323: H.245 Response %d\n",
 558                        mscm->response.choice);
 559                 break;
 560         default:
 561                 DEBUGP("nf_ct_h323: H.245 signal %d\n", mscm->choice);
 562                 break;
 563         }
 564
 565         return 0;
 566 }
 567
 568 /****************************************************************************/
 569 static int h245_help(struct sk_buff **pskb, unsigned int protoff,
 570                      struct nf_conn *ct, enum ip_conntrack_info ctinfo)
 571 {
 572         static MultimediaSystemControlMessage mscm;
 573         unsigned char *data = NULL;
 574         int datalen;
 575         int dataoff;
 576         int ret;
 577
 578         /* Until there's been traffic both ways, don't look in packets. */
 579         if (ctinfo != IP_CT_ESTABLISHED &&
 580             ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
 581                 return NF_ACCEPT;
 582         }
 583         DEBUGP("nf_ct_h245: skblen = %u\n", (*pskb)->len);
 584
 585         spin_lock_bh(&nf_h323_lock);
 586
 587         /* Process each TPKT */
 588         while (get_tpkt_data(pskb, protoff, ct, ctinfo,
 589                              &data, &datalen, &dataoff)) {
 590                 DEBUGP("nf_ct_h245: TPKT len=%d ", datalen);
 591                 NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
 592
 593                 /* Decode H.245 signal */
 594                 ret = DecodeMultimediaSystemControlMessage(data, datalen,
 595                                                            &mscm);
 596                 if (ret < 0) {
 597                         DEBUGP("nf_ct_h245: decoding error: %s\n",
 598                                ret == H323_ERROR_BOUND ?
 599                                "out of bound" : "out of range");
 600                         /* We don't drop when decoding error */
 601                         break;
 602                 }
 603
 604                 /* Process H.245 signal */
 605                 if (process_h245(pskb, ct, ctinfo, &data, dataoff, &mscm) < 0)
 606                         goto drop;
 607         }
 608
 609         spin_unlock_bh(&nf_h323_lock);
 610         return NF_ACCEPT;
 611
 612       drop:
 613         spin_unlock_bh(&nf_h323_lock);
 614         if (net_ratelimit())
 615                 printk("nf_ct_h245: packet dropped\n");
 616         return NF_DROP;
 617 }
 618
 619 /****************************************************************************/
 620 static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
 621         .name                   = "H.245",
 622         .me                     = THIS_MODULE,
 623         .max_expected           = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */,
 624         .timeout                = 240,
 625         .tuple.dst.protonum     = IPPROTO_UDP,
 626         .help                   = h245_help
 627 };
 628
 629 /****************************************************************************/
 630 int get_h225_addr(struct nf_conn *ct, unsigned char *data,
 631                   TransportAddress *taddr,
 632                   union nf_conntrack_address *addr, __be16 *port)
 633 {
 634         unsigned char *p;
 635         int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
 636         int len;
 637
 638         switch (taddr->choice) {
 639         case eTransportAddress_ipAddress:
 640                 if (family != AF_INET)
 641                         return 0;
 642                 p = data + taddr->ipAddress.ip;
 643                 len = 4;
 644                 break;
 645         case eTransportAddress_ip6Address:
 646                 if (family != AF_INET6)
 647                         return 0;
 648                 p = data + taddr->ip6Address.ip;
 649                 len = 16;
 650                 break;
 651         default:
 652                 return 0;
 653         }
 654
 655         memcpy(addr, p, len);
 656         memset((void *)addr + len, 0, sizeof(*addr) - len);
 657         memcpy(port, p + len, sizeof(__be16));
 658
 659         return 1;
 660 }
 661
 662 /****************************************************************************/
 663 static int expect_h245(struct sk_buff **pskb, struct nf_conn *ct,
 664                        enum ip_conntrack_info ctinfo,
 665                        unsigned char **data, int dataoff,
 666                        TransportAddress *taddr)
 667 {
 668         int dir = CTINFO2DIR(ctinfo);
 669         int ret = 0;
 670         __be16 port;
 671         union nf_conntrack_address addr;
 672         struct nf_conntrack_expect *exp;
 673         typeof(nat_h245_hook) nat_h245;
 674
 675         /* Read h245Address */
 676         if (!get_h225_addr(ct, *data, taddr, &addr, &port) ||
 677             memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
 678             port == 0)
 679                 return 0;
 680
 681         /* Create expect for h245 connection */
 682         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
 683                 return -1;
 684         nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
 685                           &ct->tuplehash[!dir].tuple.src.u3,
 686                           &ct->tuplehash[!dir].tuple.dst.u3,
 687                           IPPROTO_TCP, NULL, &port);
 688         exp->helper = &nf_conntrack_helper_h245;
 689
 690         if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
 691                    &ct->tuplehash[!dir].tuple.dst.u3,
 692                    sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
 693             (nat_h245 = rcu_dereference(nat_h245_hook)) &&
 694             ct->status & IPS_NAT_MASK) {
 695                 /* NAT needed */
 696                 ret = nat_h245(pskb, ct, ctinfo, data, dataoff, taddr,
 697                                port, exp);
 698         } else {                /* Conntrack only */
 699                 if (nf_ct_expect_related(exp) == 0) {
 700                         DEBUGP("nf_ct_q931: expect H.245 ");
 701                         NF_CT_DUMP_TUPLE(&exp->tuple);
 702                 } else
 703                         ret = -1;
 704         }
 705
 706         nf_ct_expect_put(exp);
 707
 708         return ret;
 709 }
 710
 711 /* If the calling party is on the same side of the forward-to party,
 712  * we don't need to track the second call */
 713 static int callforward_do_filter(union nf_conntrack_address *src,
 714                                  union nf_conntrack_address *dst,
 715                                  int family)
 716 {
 717         struct flowi fl1, fl2;
 718         int ret = 0;
 719
 720         memset(&fl1, 0, sizeof(fl1));
 721         memset(&fl2, 0, sizeof(fl2));
 722
 723         switch (family) {
 724         case AF_INET: {
 725                 struct rtable *rt1, *rt2;
 726
 727                 fl1.fl4_dst = src->ip;
 728                 fl2.fl4_dst = dst->ip;
 729                 if (ip_route_output_key(&rt1, &fl1) == 0) {
 730                         if (ip_route_output_key(&rt2, &fl2) == 0) {
 731                                 if (rt1->rt_gateway == rt2->rt_gateway &&
 732                                     rt1->u.dst.dev  == rt2->u.dst.dev)
 733                                         ret = 1;
 734                                 dst_release(&rt2->u.dst);
 735                         }
 736                         dst_release(&rt1->u.dst);
 737                 }
 738                 break;
 739         }
 740 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 741         case AF_INET6: {
 742                 struct rt6_info *rt1, *rt2;
 743
 744                 memcpy(&fl1.fl6_dst, src, sizeof(fl1.fl6_dst));
 745                 memcpy(&fl2.fl6_dst, dst, sizeof(fl2.fl6_dst));
 746                 rt1 = (struct rt6_info *)ip6_route_output(NULL, &fl1);
 747                 if (rt1) {
 748                         rt2 = (struct rt6_info *)ip6_route_output(NULL, &fl2);
 749                         if (rt2) {
 750                                 if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway,
 751                                             sizeof(rt1->rt6i_gateway)) &&
 752                                     rt1->u.dst.dev == rt2->u.dst.dev)
 753                                         ret = 1;
 754                                 dst_release(&rt2->u.dst);
 755                         }
 756                         dst_release(&rt1->u.dst);
 757                 }
 758                 break;
 759         }
 760 #endif
 761         }
 762         return ret;
 763
 764 }
 765
 766 /****************************************************************************/
 767 static int expect_callforwarding(struct sk_buff **pskb,
 768                                  struct nf_conn *ct,
 769                                  enum ip_conntrack_info ctinfo,
 770                                  unsigned char **data, int dataoff,
 771                                  TransportAddress *taddr)
 772 {
 773         int dir = CTINFO2DIR(ctinfo);
 774         int ret = 0;
 775         __be16 port;
 776         union nf_conntrack_address addr;
 777         struct nf_conntrack_expect *exp;
 778         typeof(nat_callforwarding_hook) nat_callforwarding;
 779
 780         /* Read alternativeAddress */
 781         if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0)
 782                 return 0;
 783
 784         /* If the calling party is on the same side of the forward-to party,
 785          * we don't need to track the second call */
 786         if (callforward_filter &&
 787             callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3,
 788                                   ct->tuplehash[!dir].tuple.src.l3num)) {
 789                 DEBUGP("nf_ct_q931: Call Forwarding not tracked\n");
 790                 return 0;
 791         }
 792
 793         /* Create expect for the second call leg */
 794         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
 795                 return -1;
 796         nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
 797                           &ct->tuplehash[!dir].tuple.src.u3, &addr,
 798                           IPPROTO_TCP, NULL, &port);
 799         exp->helper = nf_conntrack_helper_q931;
 800
 801         if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
 802                    &ct->tuplehash[!dir].tuple.dst.u3,
 803                    sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
 804             (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) &&
 805             ct->status & IPS_NAT_MASK) {
 806                 /* Need NAT */
 807                 ret = nat_callforwarding(pskb, ct, ctinfo, data, dataoff,
 808                                          taddr, port, exp);
 809         } else {                /* Conntrack only */
 810                 if (nf_ct_expect_related(exp) == 0) {
 811                         DEBUGP("nf_ct_q931: expect Call Forwarding ");
 812                         NF_CT_DUMP_TUPLE(&exp->tuple);
 813                 } else
 814                         ret = -1;
 815         }
 816
 817         nf_ct_expect_put(exp);
 818
 819         return ret;
 820 }
 821
 822 /****************************************************************************/
 823 static int process_setup(struct sk_buff **pskb, struct nf_conn *ct,
 824                          enum ip_conntrack_info ctinfo,
 825                          unsigned char **data, int dataoff,
 826                          Setup_UUIE *setup)
 827 {
 828         int dir = CTINFO2DIR(ctinfo);
 829         int ret;
 830         int i;
 831         __be16 port;
 832         union nf_conntrack_address addr;
 833         typeof(set_h225_addr_hook) set_h225_addr;
 834
 835         DEBUGP("nf_ct_q931: Setup\n");
 836
 837         if (setup->options & eSetup_UUIE_h245Address) {
 838                 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
 839                                   &setup->h245Address);
 840                 if (ret < 0)
 841                         return -1;
 842         }
 843
 844         set_h225_addr = rcu_dereference(set_h225_addr_hook);
 845         if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
 846             (set_h225_addr) && ct->status && IPS_NAT_MASK &&
 847             get_h225_addr(ct, *data, &setup->destCallSignalAddress,
 848                           &addr, &port) &&
 849             memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
 850                 DEBUGP("nf_ct_q931: set destCallSignalAddress "
 851                        NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n",
 852                        NIP6(*(struct in6_addr *)&addr), ntohs(port),
 853                        NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.src.u3),
 854                        ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
 855                 ret = set_h225_addr(pskb, data, dataoff,
 856                                     &setup->destCallSignalAddress,
 857                                     &ct->tuplehash[!dir].tuple.src.u3,
 858                                     ct->tuplehash[!dir].tuple.src.u.tcp.port);
 859                 if (ret < 0)
 860                         return -1;
 861         }
 862
 863         if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
 864             (set_h225_addr) && ct->status & IPS_NAT_MASK &&
 865             get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
 866                           &addr, &port) &&
 867             memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
 868                 DEBUGP("nf_ct_q931: set sourceCallSignalAddress "
 869                        NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n",
 870                        NIP6(*(struct in6_addr *)&addr), ntohs(port),
 871                        NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.dst.u3),
 872                        ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
 873                 ret = set_h225_addr(pskb, data, dataoff,
 874                                     &setup->sourceCallSignalAddress,
 875                                     &ct->tuplehash[!dir].tuple.dst.u3,
 876                                     ct->tuplehash[!dir].tuple.dst.u.tcp.port);
 877                 if (ret < 0)
 878                         return -1;
 879         }
 880
 881         if (setup->options & eSetup_UUIE_fastStart) {
 882                 for (i = 0; i < setup->fastStart.count; i++) {
 883                         ret = process_olc(pskb, ct, ctinfo, data, dataoff,
 884                                           &setup->fastStart.item[i]);
 885                         if (ret < 0)
 886                                 return -1;
 887                 }
 888         }
 889
 890         return 0;
 891 }
 892
 893 /****************************************************************************/
 894 static int process_callproceeding(struct sk_buff **pskb,
 895                                   struct nf_conn *ct,
 896                                   enum ip_conntrack_info ctinfo,
 897                                   unsigned char **data, int dataoff,
 898                                   CallProceeding_UUIE *callproc)
 899 {
 900         int ret;
 901         int i;
 902
 903         DEBUGP("nf_ct_q931: CallProceeding\n");
 904
 905         if (callproc->options & eCallProceeding_UUIE_h245Address) {
 906                 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
 907                                   &callproc->h245Address);
 908                 if (ret < 0)
 909                         return -1;
 910         }
 911
 912         if (callproc->options & eCallProceeding_UUIE_fastStart) {
 913                 for (i = 0; i < callproc->fastStart.count; i++) {
 914                         ret = process_olc(pskb, ct, ctinfo, data, dataoff,
 915                                           &callproc->fastStart.item[i]);
 916                         if (ret < 0)
 917                                 return -1;
 918                 }
 919         }
 920
 921         return 0;
 922 }
 923
 924 /****************************************************************************/
 925 static int process_connect(struct sk_buff **pskb, struct nf_conn *ct,
 926                            enum ip_conntrack_info ctinfo,
 927                            unsigned char **data, int dataoff,
 928                            Connect_UUIE *connect)
 929 {
 930         int ret;
 931         int i;
 932
 933         DEBUGP("nf_ct_q931: Connect\n");
 934
 935         if (connect->options & eConnect_UUIE_h245Address) {
 936                 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
 937                                   &connect->h245Address);
 938                 if (ret < 0)
 939                         return -1;
 940         }
 941
 942         if (connect->options & eConnect_UUIE_fastStart) {
 943                 for (i = 0; i < connect->fastStart.count; i++) {
 944                         ret = process_olc(pskb, ct, ctinfo, data, dataoff,
 945                                           &connect->fastStart.item[i]);
 946                         if (ret < 0)
 947                                 return -1;
 948                 }
 949         }
 950
 951         return 0;
 952 }
 953
 954 /****************************************************************************/
 955 static int process_alerting(struct sk_buff **pskb, struct nf_conn *ct,
 956                             enum ip_conntrack_info ctinfo,
 957                             unsigned char **data, int dataoff,
 958                             Alerting_UUIE *alert)
 959 {
 960         int ret;
 961         int i;
 962
 963         DEBUGP("nf_ct_q931: Alerting\n");
 964
 965         if (alert->options & eAlerting_UUIE_h245Address) {
 966                 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
 967                                   &alert->h245Address);
 968                 if (ret < 0)
 969                         return -1;
 970         }
 971
 972         if (alert->options & eAlerting_UUIE_fastStart) {
 973                 for (i = 0; i < alert->fastStart.count; i++) {
 974                         ret = process_olc(pskb, ct, ctinfo, data, dataoff,
 975                                           &alert->fastStart.item[i]);
 976                         if (ret < 0)
 977                                 return -1;
 978                 }
 979         }
 980
 981         return 0;
 982 }
 983
 984 /****************************************************************************/
 985 static int process_facility(struct sk_buff **pskb, struct nf_conn *ct,
 986                             enum ip_conntrack_info ctinfo,
 987                             unsigned char **data, int dataoff,
 988                             Facility_UUIE *facility)
 989 {
 990         int ret;
 991         int i;
 992
 993         DEBUGP("nf_ct_q931: Facility\n");
 994
 995         if (facility->reason.choice == eFacilityReason_callForwarded) {
 996                 if (facility->options & eFacility_UUIE_alternativeAddress)
 997                         return expect_callforwarding(pskb, ct, ctinfo, data,
 998                                                      dataoff,
 999                                                      &facility->
1000                                                      alternativeAddress);
1001                 return 0;
1002         }
1003
1004         if (facility->options & eFacility_UUIE_h245Address) {
1005                 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
1006                                   &facility->h245Address);
1007                 if (ret < 0)
1008                         return -1;
1009         }
1010
1011         if (facility->options & eFacility_UUIE_fastStart) {
1012                 for (i = 0; i < facility->fastStart.count; i++) {
1013                         ret = process_olc(pskb, ct, ctinfo, data, dataoff,
1014                                           &facility->fastStart.item[i]);
1015                         if (ret < 0)
1016                                 return -1;
1017                 }
1018         }
1019
1020         return 0;
1021 }
1022
1023 /****************************************************************************/
1024 static int process_progress(struct sk_buff **pskb, struct nf_conn *ct,
1025                             enum ip_conntrack_info ctinfo,
1026                             unsigned char **data, int dataoff,
1027                             Progress_UUIE *progress)
1028 {
1029         int ret;
1030         int i;
1031
1032         DEBUGP("nf_ct_q931: Progress\n");
1033
1034         if (progress->options & eProgress_UUIE_h245Address) {
1035                 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
1036                                   &progress->h245Address);
1037                 if (ret < 0)
1038                         return -1;
1039         }
1040
1041         if (progress->options & eProgress_UUIE_fastStart) {
1042                 for (i = 0; i < progress->fastStart.count; i++) {
1043                         ret = process_olc(pskb, ct, ctinfo, data, dataoff,
1044                                           &progress->fastStart.item[i]);
1045                         if (ret < 0)
1046                                 return -1;
1047                 }
1048         }
1049
1050         return 0;
1051 }
1052
1053 /****************************************************************************/
1054 static int process_q931(struct sk_buff **pskb, struct nf_conn *ct,
1055                         enum ip_conntrack_info ctinfo,
1056                         unsigned char **data, int dataoff, Q931 *q931)
1057 {
1058         H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
1059         int i;
1060         int ret = 0;
1061
1062         switch (pdu->h323_message_body.choice) {
1063         case eH323_UU_PDU_h323_message_body_setup:
1064                 ret = process_setup(pskb, ct, ctinfo, data, dataoff,
1065                                     &pdu->h323_message_body.setup);
1066                 break;
1067         case eH323_UU_PDU_h323_message_body_callProceeding:
1068                 ret = process_callproceeding(pskb, ct, ctinfo, data, dataoff,
1069                                              &pdu->h323_message_body.
1070                                              callProceeding);
1071                 break;
1072         case eH323_UU_PDU_h323_message_body_connect:
1073                 ret = process_connect(pskb, ct, ctinfo, data, dataoff,
1074                                       &pdu->h323_message_body.connect);
1075                 break;
1076         case eH323_UU_PDU_h323_message_body_alerting:
1077                 ret = process_alerting(pskb, ct, ctinfo, data, dataoff,
1078                                        &pdu->h323_message_body.alerting);
1079                 break;
1080         case eH323_UU_PDU_h323_message_body_facility:
1081                 ret = process_facility(pskb, ct, ctinfo, data, dataoff,
1082                                        &pdu->h323_message_body.facility);
1083                 break;
1084         case eH323_UU_PDU_h323_message_body_progress:
1085                 ret = process_progress(pskb, ct, ctinfo, data, dataoff,
1086                                        &pdu->h323_message_body.progress);
1087                 break;
1088         default:
1089                 DEBUGP("nf_ct_q931: Q.931 signal %d\n",
1090                        pdu->h323_message_body.choice);
1091                 break;
1092         }
1093
1094         if (ret < 0)
1095                 return -1;
1096
1097         if (pdu->options & eH323_UU_PDU_h245Control) {
1098                 for (i = 0; i < pdu->h245Control.count; i++) {
1099                         ret = process_h245(pskb, ct, ctinfo, data, dataoff,
1100                                            &pdu->h245Control.item[i]);
1101                         if (ret < 0)
1102                                 return -1;
1103                 }
1104         }
1105
1106         return 0;
1107 }
1108
1109 /****************************************************************************/
1110 static int q931_help(struct sk_buff **pskb, unsigned int protoff,
1111                      struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1112 {
1113         static Q931 q931;
1114         unsigned char *data = NULL;
1115         int datalen;
1116         int dataoff;
1117         int ret;
1118
1119         /* Until there's been traffic both ways, don't look in packets. */
1120         if (ctinfo != IP_CT_ESTABLISHED &&
1121             ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
1122                 return NF_ACCEPT;
1123         }
1124         DEBUGP("nf_ct_q931: skblen = %u\n", (*pskb)->len);
1125
1126         spin_lock_bh(&nf_h323_lock);
1127
1128         /* Process each TPKT */
1129         while (get_tpkt_data(pskb, protoff, ct, ctinfo,
1130                              &data, &datalen, &dataoff)) {
1131                 DEBUGP("nf_ct_q931: TPKT len=%d ", datalen);
1132                 NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1133
1134                 /* Decode Q.931 signal */
1135                 ret = DecodeQ931(data, datalen, &q931);
1136                 if (ret < 0) {
1137                         DEBUGP("nf_ct_q931: decoding error: %s\n",
1138                                ret == H323_ERROR_BOUND ?
1139                                "out of bound" : "out of range");
1140                         /* We don't drop when decoding error */
1141                         break;
1142                 }
1143
1144                 /* Process Q.931 signal */
1145                 if (process_q931(pskb, ct, ctinfo, &data, dataoff, &q931) < 0)
1146                         goto drop;
1147         }
1148
1149         spin_unlock_bh(&nf_h323_lock);
1150         return NF_ACCEPT;
1151
1152       drop:
1153         spin_unlock_bh(&nf_h323_lock);
1154         if (net_ratelimit())
1155                 printk("nf_ct_q931: packet dropped\n");
1156         return NF_DROP;
1157 }
1158
1159 /****************************************************************************/
1160 static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
1161         {
1162                 .name                   = "Q.931",
1163                 .me                     = THIS_MODULE,
1164                                           /* T.120 and H.245 */
1165                 .max_expected           = H323_RTP_CHANNEL_MAX * 4 + 4,
1166                 .timeout                = 240,
1167                 .tuple.src.l3num        = AF_INET,
1168                 .tuple.src.u.tcp.port   = __constant_htons(Q931_PORT),
1169                 .tuple.dst.protonum     = IPPROTO_TCP,
1170                 .help                   = q931_help
1171         },
1172         {
1173                 .name                   = "Q.931",
1174                 .me                     = THIS_MODULE,
1175                                           /* T.120 and H.245 */
1176                 .max_expected           = H323_RTP_CHANNEL_MAX * 4 + 4,
1177                 .timeout                = 240,
1178                 .tuple.src.l3num        = AF_INET6,
1179                 .tuple.src.u.tcp.port   = __constant_htons(Q931_PORT),
1180                 .tuple.dst.protonum     = IPPROTO_TCP,
1181                 .help                   = q931_help
1182         },
1183 };
1184
1185 /****************************************************************************/
1186 static unsigned char *get_udp_data(struct sk_buff **pskb, unsigned int protoff,
1187                                    int *datalen)
1188 {
1189         struct udphdr _uh, *uh;
1190         int dataoff;
1191
1192         uh = skb_header_pointer(*pskb, protoff, sizeof(_uh), &_uh);
1193         if (uh == NULL)
1194                 return NULL;
1195         dataoff = protoff + sizeof(_uh);
1196         if (dataoff >= (*pskb)->len)
1197                 return NULL;
1198         *datalen = (*pskb)->len - dataoff;
1199         return skb_header_pointer(*pskb, dataoff, *datalen, h323_buffer);
1200 }
1201
1202 /****************************************************************************/
1203 static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
1204                                                union nf_conntrack_address *addr,
1205                                                __be16 port)
1206 {
1207         struct nf_conntrack_expect *exp;
1208         struct nf_conntrack_tuple tuple;
1209
1210         memset(&tuple.src.u3, 0, sizeof(tuple.src.u3));
1211         tuple.src.u.tcp.port = 0;
1212         memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3));
1213         tuple.dst.u.tcp.port = port;
1214         tuple.dst.protonum = IPPROTO_TCP;
1215
1216         exp = __nf_ct_expect_find(&tuple);
1217         if (exp && exp->master == ct)
1218                 return exp;
1219         return NULL;
1220 }
1221
1222 /****************************************************************************/
1223 static int set_expect_timeout(struct nf_conntrack_expect *exp,
1224                               unsigned timeout)
1225 {
1226         if (!exp || !del_timer(&exp->timeout))
1227                 return 0;
1228
1229         exp->timeout.expires = jiffies + timeout * HZ;
1230         add_timer(&exp->timeout);
1231
1232         return 1;
1233 }
1234
1235 /****************************************************************************/
1236 static int expect_q931(struct sk_buff **pskb, struct nf_conn *ct,
1237                        enum ip_conntrack_info ctinfo,
1238                        unsigned char **data,
1239                        TransportAddress *taddr, int count)
1240 {
1241         struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1242         int dir = CTINFO2DIR(ctinfo);
1243         int ret = 0;
1244         int i;
1245         __be16 port;
1246         union nf_conntrack_address addr;
1247         struct nf_conntrack_expect *exp;
1248         typeof(nat_q931_hook) nat_q931;
1249
1250         /* Look for the first related address */
1251         for (i = 0; i < count; i++) {
1252                 if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
1253                     memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3,
1254                            sizeof(addr)) == 0 && port != 0)
1255                         break;
1256         }
1257
1258         if (i >= count)         /* Not found */
1259                 return 0;
1260
1261         /* Create expect for Q.931 */
1262         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1263                 return -1;
1264         nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1265                           gkrouted_only ? /* only accept calls from GK? */
1266                                 &ct->tuplehash[!dir].tuple.src.u3 : NULL,
1267                           &ct->tuplehash[!dir].tuple.dst.u3,
1268                           IPPROTO_TCP, NULL, &port);
1269         exp->helper = nf_conntrack_helper_q931;
1270         exp->flags = NF_CT_EXPECT_PERMANENT;    /* Accept multiple calls */
1271
1272         nat_q931 = rcu_dereference(nat_q931_hook);
1273         if (nat_q931 && ct->status & IPS_NAT_MASK) {    /* Need NAT */
1274                 ret = nat_q931(pskb, ct, ctinfo, data, taddr, i, port, exp);
1275         } else {                /* Conntrack only */
1276                 if (nf_ct_expect_related(exp) == 0) {
1277                         DEBUGP("nf_ct_ras: expect Q.931 ");
1278                         NF_CT_DUMP_TUPLE(&exp->tuple);
1279
1280                         /* Save port for looking up expect in processing RCF */
1281                         info->sig_port[dir] = port;
1282                 } else
1283                         ret = -1;
1284         }
1285
1286         nf_ct_expect_put(exp);
1287
1288         return ret;
1289 }
1290
1291 /****************************************************************************/
1292 static int process_grq(struct sk_buff **pskb, struct nf_conn *ct,
1293                        enum ip_conntrack_info ctinfo,
1294                        unsigned char **data, GatekeeperRequest *grq)
1295 {
1296         typeof(set_ras_addr_hook) set_ras_addr;
1297
1298         DEBUGP("nf_ct_ras: GRQ\n");
1299
1300         set_ras_addr = rcu_dereference(set_ras_addr_hook);
1301         if (set_ras_addr && ct->status & IPS_NAT_MASK)  /* NATed */
1302                 return set_ras_addr(pskb, ct, ctinfo, data,
1303                                     &grq->rasAddress, 1);
1304         return 0;
1305 }
1306
1307 /****************************************************************************/
1308 static int process_gcf(struct sk_buff **pskb, struct nf_conn *ct,
1309                        enum ip_conntrack_info ctinfo,
1310                        unsigned char **data, GatekeeperConfirm *gcf)
1311 {
1312         int dir = CTINFO2DIR(ctinfo);
1313         int ret = 0;
1314         __be16 port;
1315         union nf_conntrack_address addr;
1316         struct nf_conntrack_expect *exp;
1317
1318         DEBUGP("nf_ct_ras: GCF\n");
1319
1320         if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port))
1321                 return 0;
1322
1323         /* Registration port is the same as discovery port */
1324         if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1325             port == ct->tuplehash[dir].tuple.src.u.udp.port)
1326                 return 0;
1327
1328         /* Avoid RAS expectation loops. A GCF is never expected. */
1329         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1330                 return 0;
1331
1332         /* Need new expect */
1333         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1334                 return -1;
1335         nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1336                           &ct->tuplehash[!dir].tuple.src.u3, &addr,
1337                           IPPROTO_UDP, NULL, &port);
1338         exp->helper = nf_conntrack_helper_ras;
1339
1340         if (nf_ct_expect_related(exp) == 0) {
1341                 DEBUGP("nf_ct_ras: expect RAS ");
1342                 NF_CT_DUMP_TUPLE(&exp->tuple);
1343         } else
1344                 ret = -1;
1345
1346         nf_ct_expect_put(exp);
1347
1348         return ret;
1349 }
1350
1351 /****************************************************************************/
1352 static int process_rrq(struct sk_buff **pskb, struct nf_conn *ct,
1353                        enum ip_conntrack_info ctinfo,
1354                        unsigned char **data, RegistrationRequest *rrq)
1355 {
1356         struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1357         int ret;
1358         typeof(set_ras_addr_hook) set_ras_addr;
1359
1360         DEBUGP("nf_ct_ras: RRQ\n");
1361
1362         ret = expect_q931(pskb, ct, ctinfo, data,
1363                           rrq->callSignalAddress.item,
1364                           rrq->callSignalAddress.count);
1365         if (ret < 0)
1366                 return -1;
1367
1368         set_ras_addr = rcu_dereference(set_ras_addr_hook);
1369         if (set_ras_addr && ct->status & IPS_NAT_MASK) {
1370                 ret = set_ras_addr(pskb, ct, ctinfo, data,
1371                                    rrq->rasAddress.item,
1372                                    rrq->rasAddress.count);
1373                 if (ret < 0)
1374                         return -1;
1375         }
1376
1377         if (rrq->options & eRegistrationRequest_timeToLive) {
1378                 DEBUGP("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
1379                 info->timeout = rrq->timeToLive;
1380         } else
1381                 info->timeout = default_rrq_ttl;
1382
1383         return 0;
1384 }
1385
1386 /****************************************************************************/
1387 static int process_rcf(struct sk_buff **pskb, struct nf_conn *ct,
1388                        enum ip_conntrack_info ctinfo,
1389                        unsigned char **data, RegistrationConfirm *rcf)
1390 {
1391         struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1392         int dir = CTINFO2DIR(ctinfo);
1393         int ret;
1394         struct nf_conntrack_expect *exp;
1395         typeof(set_sig_addr_hook) set_sig_addr;
1396
1397         DEBUGP("nf_ct_ras: RCF\n");
1398
1399         set_sig_addr = rcu_dereference(set_sig_addr_hook);
1400         if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1401                 ret = set_sig_addr(pskb, ct, ctinfo, data,
1402                                         rcf->callSignalAddress.item,
1403                                         rcf->callSignalAddress.count);
1404                 if (ret < 0)
1405                         return -1;
1406         }
1407
1408         if (rcf->options & eRegistrationConfirm_timeToLive) {
1409                 DEBUGP("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
1410                 info->timeout = rcf->timeToLive;
1411         }
1412
1413         if (info->timeout > 0) {
1414                 DEBUGP
1415                     ("nf_ct_ras: set RAS connection timeout to %u seconds\n",
1416                      info->timeout);
1417                 nf_ct_refresh(ct, *pskb, info->timeout * HZ);
1418
1419                 /* Set expect timeout */
1420                 read_lock_bh(&nf_conntrack_lock);
1421                 exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
1422                                   info->sig_port[!dir]);
1423                 if (exp) {
1424                         DEBUGP("nf_ct_ras: set Q.931 expect "
1425                                "timeout to %u seconds for",
1426                                info->timeout);
1427                         NF_CT_DUMP_TUPLE(&exp->tuple);
1428                         set_expect_timeout(exp, info->timeout);
1429                 }
1430                 read_unlock_bh(&nf_conntrack_lock);
1431         }
1432
1433         return 0;
1434 }
1435
1436 /****************************************************************************/
1437 static int process_urq(struct sk_buff **pskb, struct nf_conn *ct,
1438                        enum ip_conntrack_info ctinfo,
1439                        unsigned char **data, UnregistrationRequest *urq)
1440 {
1441         struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1442         int dir = CTINFO2DIR(ctinfo);
1443         int ret;
1444         typeof(set_sig_addr_hook) set_sig_addr;
1445
1446         DEBUGP("nf_ct_ras: URQ\n");
1447
1448         set_sig_addr = rcu_dereference(set_sig_addr_hook);
1449         if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1450                 ret = set_sig_addr(pskb, ct, ctinfo, data,
1451                                    urq->callSignalAddress.item,
1452                                    urq->callSignalAddress.count);
1453                 if (ret < 0)
1454                         return -1;
1455         }
1456
1457         /* Clear old expect */
1458         nf_ct_remove_expectations(ct);
1459         info->sig_port[dir] = 0;
1460         info->sig_port[!dir] = 0;
1461
1462         /* Give it 30 seconds for UCF or URJ */
1463         nf_ct_refresh(ct, *pskb, 30 * HZ);
1464
1465         return 0;
1466 }
1467
1468 /****************************************************************************/
1469 static int process_arq(struct sk_buff **pskb, struct nf_conn *ct,
1470                        enum ip_conntrack_info ctinfo,
1471                        unsigned char **data, AdmissionRequest *arq)
1472 {
1473         struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1474         int dir = CTINFO2DIR(ctinfo);
1475         __be16 port;
1476         union nf_conntrack_address addr;
1477         typeof(set_h225_addr_hook) set_h225_addr;
1478
1479         DEBUGP("nf_ct_ras: ARQ\n");
1480
1481         set_h225_addr = rcu_dereference(set_h225_addr_hook);
1482         if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
1483             get_h225_addr(ct, *data, &arq->destCallSignalAddress,
1484                           &addr, &port) &&
1485             !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1486             port == info->sig_port[dir] &&
1487             set_h225_addr && ct->status & IPS_NAT_MASK) {
1488                 /* Answering ARQ */
1489                 return set_h225_addr(pskb, data, 0,
1490                                      &arq->destCallSignalAddress,
1491                                      &ct->tuplehash[!dir].tuple.dst.u3,
1492                                      info->sig_port[!dir]);
1493         }
1494
1495         if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
1496             get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
1497                           &addr, &port) &&
1498             !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1499             set_h225_addr && ct->status & IPS_NAT_MASK) {
1500                 /* Calling ARQ */
1501                 return set_h225_addr(pskb, data, 0,
1502                                      &arq->srcCallSignalAddress,
1503                                      &ct->tuplehash[!dir].tuple.dst.u3,
1504                                      port);
1505         }
1506
1507         return 0;
1508 }
1509
1510 /****************************************************************************/
1511 static int process_acf(struct sk_buff **pskb, struct nf_conn *ct,
1512                        enum ip_conntrack_info ctinfo,
1513                        unsigned char **data, AdmissionConfirm *acf)
1514 {
1515         int dir = CTINFO2DIR(ctinfo);
1516         int ret = 0;
1517         __be16 port;
1518         union nf_conntrack_address addr;
1519         struct nf_conntrack_expect *exp;
1520         typeof(set_sig_addr_hook) set_sig_addr;
1521
1522         DEBUGP("nf_ct_ras: ACF\n");
1523
1524         if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
1525                            &addr, &port))
1526                 return 0;
1527
1528         if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
1529                 /* Answering ACF */
1530                 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1531                 if (set_sig_addr && ct->status & IPS_NAT_MASK)
1532                         return set_sig_addr(pskb, ct, ctinfo, data,
1533                                             &acf->destCallSignalAddress, 1);
1534                 return 0;
1535         }
1536
1537         /* Need new expect */
1538         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1539                 return -1;
1540         nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1541                           &ct->tuplehash[!dir].tuple.src.u3, &addr,
1542                           IPPROTO_TCP, NULL, &port);
1543         exp->flags = NF_CT_EXPECT_PERMANENT;
1544         exp->helper = nf_conntrack_helper_q931;
1545
1546         if (nf_ct_expect_related(exp) == 0) {
1547                 DEBUGP("nf_ct_ras: expect Q.931 ");
1548                 NF_CT_DUMP_TUPLE(&exp->tuple);
1549         } else
1550                 ret = -1;
1551
1552         nf_ct_expect_put(exp);
1553
1554         return ret;
1555 }
1556
1557 /****************************************************************************/
1558 static int process_lrq(struct sk_buff **pskb, struct nf_conn *ct,
1559                        enum ip_conntrack_info ctinfo,
1560                        unsigned char **data, LocationRequest *lrq)
1561 {
1562         typeof(set_ras_addr_hook) set_ras_addr;
1563
1564         DEBUGP("nf_ct_ras: LRQ\n");
1565
1566         set_ras_addr = rcu_dereference(set_ras_addr_hook);
1567         if (set_ras_addr && ct->status & IPS_NAT_MASK)
1568                 return set_ras_addr(pskb, ct, ctinfo, data,
1569                                     &lrq->replyAddress, 1);
1570         return 0;
1571 }
1572
1573 /****************************************************************************/
1574 static int process_lcf(struct sk_buff **pskb, struct nf_conn *ct,
1575                        enum ip_conntrack_info ctinfo,
1576                        unsigned char **data, LocationConfirm *lcf)
1577 {
1578         int dir = CTINFO2DIR(ctinfo);
1579         int ret = 0;
1580         __be16 port;
1581         union nf_conntrack_address addr;
1582         struct nf_conntrack_expect *exp;
1583
1584         DEBUGP("nf_ct_ras: LCF\n");
1585
1586         if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
1587                            &addr, &port))
1588                 return 0;
1589
1590         /* Need new expect for call signal */
1591         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1592                 return -1;
1593         nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1594                           &ct->tuplehash[!dir].tuple.src.u3, &addr,
1595                           IPPROTO_TCP, NULL, &port);
1596         exp->flags = NF_CT_EXPECT_PERMANENT;
1597         exp->helper = nf_conntrack_helper_q931;
1598
1599         if (nf_ct_expect_related(exp) == 0) {
1600                 DEBUGP("nf_ct_ras: expect Q.931 ");
1601                 NF_CT_DUMP_TUPLE(&exp->tuple);
1602         } else
1603                 ret = -1;
1604
1605         nf_ct_expect_put(exp);
1606
1607         /* Ignore rasAddress */
1608
1609         return ret;
1610 }
1611
1612 /****************************************************************************/
1613 static int process_irr(struct sk_buff **pskb, struct nf_conn *ct,
1614                        enum ip_conntrack_info ctinfo,
1615                        unsigned char **data, InfoRequestResponse *irr)
1616 {
1617         int ret;
1618         typeof(set_ras_addr_hook) set_ras_addr;
1619         typeof(set_sig_addr_hook) set_sig_addr;
1620
1621         DEBUGP("nf_ct_ras: IRR\n");
1622
1623         set_ras_addr = rcu_dereference(set_ras_addr_hook);
1624         if (set_ras_addr && ct->status & IPS_NAT_MASK) {
1625                 ret = set_ras_addr(pskb, ct, ctinfo, data,
1626                                    &irr->rasAddress, 1);
1627                 if (ret < 0)
1628                         return -1;
1629         }
1630
1631         set_sig_addr = rcu_dereference(set_sig_addr_hook);
1632         if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1633                 ret = set_sig_addr(pskb, ct, ctinfo, data,
1634                                         irr->callSignalAddress.item,
1635                                         irr->callSignalAddress.count);
1636                 if (ret < 0)
1637                         return -1;
1638         }
1639
1640         return 0;
1641 }
1642
1643 /****************************************************************************/
1644 static int process_ras(struct sk_buff **pskb, struct nf_conn *ct,
1645                        enum ip_conntrack_info ctinfo,
1646                        unsigned char **data, RasMessage *ras)
1647 {
1648         switch (ras->choice) {
1649         case eRasMessage_gatekeeperRequest:
1650                 return process_grq(pskb, ct, ctinfo, data,
1651                                    &ras->gatekeeperRequest);
1652         case eRasMessage_gatekeeperConfirm:
1653                 return process_gcf(pskb, ct, ctinfo, data,
1654                                    &ras->gatekeeperConfirm);
1655         case eRasMessage_registrationRequest:
1656                 return process_rrq(pskb, ct, ctinfo, data,
1657                                    &ras->registrationRequest);
1658         case eRasMessage_registrationConfirm:
1659                 return process_rcf(pskb, ct, ctinfo, data,
1660                                    &ras->registrationConfirm);
1661         case eRasMessage_unregistrationRequest:
1662                 return process_urq(pskb, ct, ctinfo, data,
1663                                    &ras->unregistrationRequest);
1664         case eRasMessage_admissionRequest:
1665                 return process_arq(pskb, ct, ctinfo, data,
1666                                    &ras->admissionRequest);
1667         case eRasMessage_admissionConfirm:
1668                 return process_acf(pskb, ct, ctinfo, data,
1669                                    &ras->admissionConfirm);
1670         case eRasMessage_locationRequest:
1671                 return process_lrq(pskb, ct, ctinfo, data,
1672                                    &ras->locationRequest);
1673         case eRasMessage_locationConfirm:
1674                 return process_lcf(pskb, ct, ctinfo, data,
1675                                    &ras->locationConfirm);
1676         case eRasMessage_infoRequestResponse:
1677                 return process_irr(pskb, ct, ctinfo, data,
1678                                    &ras->infoRequestResponse);
1679         default:
1680                 DEBUGP("nf_ct_ras: RAS message %d\n", ras->choice);
1681                 break;
1682         }
1683
1684         return 0;
1685 }
1686
1687 /****************************************************************************/
1688 static int ras_help(struct sk_buff **pskb, unsigned int protoff,
1689                     struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1690 {
1691         static RasMessage ras;
1692         unsigned char *data;
1693         int datalen = 0;
1694         int ret;
1695
1696         DEBUGP("nf_ct_ras: skblen = %u\n", (*pskb)->len);
1697
1698         spin_lock_bh(&nf_h323_lock);
1699
1700         /* Get UDP data */
1701         data = get_udp_data(pskb, protoff, &datalen);
1702         if (data == NULL)
1703                 goto accept;
1704         DEBUGP("nf_ct_ras: RAS message len=%d ", datalen);
1705         NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1706
1707         /* Decode RAS message */
1708         ret = DecodeRasMessage(data, datalen, &ras);
1709         if (ret < 0) {
1710                 DEBUGP("nf_ct_ras: decoding error: %s\n",
1711                        ret == H323_ERROR_BOUND ?
1712                        "out of bound" : "out of range");
1713                 goto accept;
1714         }
1715
1716         /* Process RAS message */
1717         if (process_ras(pskb, ct, ctinfo, &data, &ras) < 0)
1718                 goto drop;
1719
1720       accept:
1721         spin_unlock_bh(&nf_h323_lock);
1722         return NF_ACCEPT;
1723
1724       drop:
1725         spin_unlock_bh(&nf_h323_lock);
1726         if (net_ratelimit())
1727                 printk("nf_ct_ras: packet dropped\n");
1728         return NF_DROP;
1729 }
1730
1731 /****************************************************************************/
1732 static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
1733         {
1734                 .name                   = "RAS",
1735                 .me                     = THIS_MODULE,
1736                 .max_expected           = 32,
1737                 .timeout                = 240,
1738                 .tuple.src.l3num        = AF_INET,
1739                 .tuple.src.u.udp.port   = __constant_htons(RAS_PORT),
1740                 .tuple.dst.protonum     = IPPROTO_UDP,
1741                 .help                   = ras_help,
1742         },
1743         {
1744                 .name                   = "RAS",
1745                 .me                     = THIS_MODULE,
1746                 .max_expected           = 32,
1747                 .timeout                = 240,
1748                 .tuple.src.l3num        = AF_INET6,
1749                 .tuple.src.u.udp.port   = __constant_htons(RAS_PORT),
1750                 .tuple.dst.protonum     = IPPROTO_UDP,
1751                 .help                   = ras_help,
1752         },
1753 };
1754
1755 /****************************************************************************/
1756 static void __exit nf_conntrack_h323_fini(void)
1757 {
1758         nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]);
1759         nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1760         nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1761         nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
1762         kfree(h323_buffer);
1763         DEBUGP("nf_ct_h323: fini\n");
1764 }
1765
1766 /****************************************************************************/
1767 static int __init nf_conntrack_h323_init(void)
1768 {
1769         int ret;
1770
1771         h323_buffer = kmalloc(65536, GFP_KERNEL);
1772         if (!h323_buffer)
1773                 return -ENOMEM;
1774         ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]);
1775         if (ret < 0)
1776                 goto err1;
1777         ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]);
1778         if (ret < 0)
1779                 goto err2;
1780         ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]);
1781         if (ret < 0)
1782                 goto err3;
1783         ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]);
1784         if (ret < 0)
1785                 goto err4;
1786         DEBUGP("nf_ct_h323: init success\n");
1787         return 0;
1788
1789 err4:
1790         nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1791 err3:
1792         nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1793 err2:
1794         nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
1795 err1:
1796         return ret;
1797 }
1798
1799 /****************************************************************************/
1800 module_init(nf_conntrack_h323_init);
1801 module_exit(nf_conntrack_h323_fini);
1802
1803 EXPORT_SYMBOL_GPL(get_h225_addr);
1804 EXPORT_SYMBOL_GPL(set_h245_addr_hook);
1805 EXPORT_SYMBOL_GPL(set_h225_addr_hook);
1806 EXPORT_SYMBOL_GPL(set_sig_addr_hook);
1807 EXPORT_SYMBOL_GPL(set_ras_addr_hook);
1808 EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
1809 EXPORT_SYMBOL_GPL(nat_t120_hook);
1810 EXPORT_SYMBOL_GPL(nat_h245_hook);
1811 EXPORT_SYMBOL_GPL(nat_callforwarding_hook);
1812 EXPORT_SYMBOL_GPL(nat_q931_hook);
1813
1814 MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1815 MODULE_DESCRIPTION("H.323 connection tracking helper");
1816 MODULE_LICENSE("GPL");
1817 MODULE_ALIAS("ip_conntrack_h323");