net/netfilter/nf_conntrack_h323_main.c

   1 /*
   2  * H.323 connection tracking helper
   3  *
   4  * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net>
   5  *
   6  * This source code is licensed under General Public License version 2.
   7  *
   8  * Based on the 'brute force' H.323 connection tracking module by
   9  * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
  10  *
  11  * For more information, please see http://nath323.sourceforge.net/
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/ctype.h>
  17 #include <linux/inet.h>
  18 #include <linux/in.h>
  19 #include <linux/ip.h>
  20 #include <linux/udp.h>
  21 #include <linux/tcp.h>
  22 #include <linux/skbuff.h>
  23 #include <net/route.h>
  24 #include <net/ip6_route.h>
  25
  26 #include <net/netfilter/nf_conntrack.h>
  27 #include <net/netfilter/nf_conntrack_core.h>
  28 #include <net/netfilter/nf_conntrack_tuple.h>
  29 #include <net/netfilter/nf_conntrack_expect.h>
  30 #include <net/netfilter/nf_conntrack_ecache.h>
  31 #include <net/netfilter/nf_conntrack_helper.h>
  32 #include <linux/netfilter/nf_conntrack_h323.h>
  33
  34 #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                                 if (net_ratelimit())
 167                                         printk("nf_ct_h323: "
 168                                                "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                         DEBUGP("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                 if (net_ratelimit())
 203                         printk("nf_ct_h323: incomplete TPKT (fragmented?)\n");
 204                 goto clear_out;
 205         }
 206
 207         /* This is the encapsulated data */
 208         *data = tpkt + 4;
 209         *datalen = tpktlen - 4;
 210         *dataoff = tpktoff + 4;
 211
 212       out:
 213         /* Clear TPKT length */
 214         info->tpkt_len[dir] = 0;
 215         return 1;
 216
 217       clear_out:
 218         info->tpkt_len[dir] = 0;
 219         return 0;
 220 }
 221
 222 /****************************************************************************/
 223 static int get_h245_addr(struct nf_conn *ct, unsigned char *data,
 224                          H245_TransportAddress *taddr,
 225                          union nf_conntrack_address *addr, __be16 *port)
 226 {
 227         unsigned char *p;
 228         int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
 229         int len;
 230
 231         if (taddr->choice != eH245_TransportAddress_unicastAddress)
 232                 return 0;
 233
 234         switch (taddr->unicastAddress.choice) {
 235         case eUnicastAddress_iPAddress:
 236                 if (family != AF_INET)
 237                         return 0;
 238                 p = data + taddr->unicastAddress.iPAddress.network;
 239                 len = 4;
 240                 break;
 241         case eUnicastAddress_iP6Address:
 242                 if (family != AF_INET6)
 243                         return 0;
 244                 p = data + taddr->unicastAddress.iP6Address.network;
 245                 len = 16;
 246                 break;
 247         default:
 248                 return 0;
 249         }
 250
 251         memcpy(addr, p, len);
 252         memset((void *)addr + len, 0, sizeof(*addr) - len);
 253         memcpy(port, p + len, sizeof(__be16));
 254
 255         return 1;
 256 }
 257
 258 /****************************************************************************/
 259 static int expect_rtp_rtcp(struct sk_buff **pskb, struct nf_conn *ct,
 260                            enum ip_conntrack_info ctinfo,
 261                            unsigned char **data, int dataoff,
 262                            H245_TransportAddress *taddr)
 263 {
 264         int dir = CTINFO2DIR(ctinfo);
 265         int ret = 0;
 266         __be16 port;
 267         __be16 rtp_port, rtcp_port;
 268         union nf_conntrack_address addr;
 269         struct nf_conntrack_expect *rtp_exp;
 270         struct nf_conntrack_expect *rtcp_exp;
 271         typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp;
 272
 273         /* Read RTP or RTCP address */
 274         if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
 275             memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
 276             port == 0)
 277                 return 0;
 278
 279         /* RTP port is even */
 280         port &= htons(~1);
 281         rtp_port = port;
 282         rtcp_port = htons(ntohs(port) + 1);
 283
 284         /* Create expect for RTP */
 285         if ((rtp_exp = nf_conntrack_expect_alloc(ct)) == NULL)
 286                 return -1;
 287         nf_conntrack_expect_init(rtp_exp, ct->tuplehash[!dir].tuple.src.l3num,
 288                                  &ct->tuplehash[!dir].tuple.src.u3,
 289                                  &ct->tuplehash[!dir].tuple.dst.u3,
 290                                  IPPROTO_UDP, NULL, &rtp_port);
 291
 292         /* Create expect for RTCP */
 293         if ((rtcp_exp = nf_conntrack_expect_alloc(ct)) == NULL) {
 294                 nf_conntrack_expect_put(rtp_exp);
 295                 return -1;
 296         }
 297         nf_conntrack_expect_init(rtcp_exp, ct->tuplehash[!dir].tuple.src.l3num,
 298                                  &ct->tuplehash[!dir].tuple.src.u3,
 299                                  &ct->tuplehash[!dir].tuple.dst.u3,
 300                                  IPPROTO_UDP, NULL, &rtcp_port);
 301
 302         if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
 303                    &ct->tuplehash[!dir].tuple.dst.u3,
 304                    sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
 305                    (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) &&
 306                    ct->status & IPS_NAT_MASK) {
 307                 /* NAT needed */
 308                 ret = nat_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
 309                                    taddr, port, rtp_port, rtp_exp, rtcp_exp);
 310         } else {                /* Conntrack only */
 311                 if (nf_conntrack_expect_related(rtp_exp) == 0) {
 312                         if (nf_conntrack_expect_related(rtcp_exp) == 0) {
 313                                 DEBUGP("nf_ct_h323: expect RTP ");
 314                                 NF_CT_DUMP_TUPLE(&rtp_exp->tuple);
 315                                 DEBUGP("nf_ct_h323: expect RTCP ");
 316                                 NF_CT_DUMP_TUPLE(&rtcp_exp->tuple);
 317                         } else {
 318                                 nf_conntrack_unexpect_related(rtp_exp);
 319                                 ret = -1;
 320                         }
 321                 } else
 322                         ret = -1;
 323         }
 324
 325         nf_conntrack_expect_put(rtp_exp);
 326         nf_conntrack_expect_put(rtcp_exp);
 327
 328         return ret;
 329 }
 330
 331 /****************************************************************************/
 332 static int expect_t120(struct sk_buff **pskb,
 333                        struct nf_conn *ct,
 334                        enum ip_conntrack_info ctinfo,
 335                        unsigned char **data, int dataoff,
 336                        H245_TransportAddress *taddr)
 337 {
 338         int dir = CTINFO2DIR(ctinfo);
 339         int ret = 0;
 340         __be16 port;
 341         union nf_conntrack_address addr;
 342         struct nf_conntrack_expect *exp;
 343         typeof(nat_t120_hook) nat_t120;
 344
 345         /* Read T.120 address */
 346         if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
 347             memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
 348             port == 0)
 349                 return 0;
 350
 351         /* Create expect for T.120 connections */
 352         if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
 353                 return -1;
 354         nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
 355                                  &ct->tuplehash[!dir].tuple.src.u3,
 356                                  &ct->tuplehash[!dir].tuple.dst.u3,
 357                                  IPPROTO_TCP, NULL, &port);
 358         exp->flags = NF_CT_EXPECT_PERMANENT;    /* Accept multiple channels */
 359
 360         if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
 361                    &ct->tuplehash[!dir].tuple.dst.u3,
 362                    sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
 363             (nat_t120 = rcu_dereference(nat_t120_hook)) &&
 364             ct->status & IPS_NAT_MASK) {
 365                 /* NAT needed */
 366                 ret = nat_t120(pskb, ct, ctinfo, data, dataoff, taddr,
 367                                port, exp);
 368         } else {                /* Conntrack only */
 369                 if (nf_conntrack_expect_related(exp) == 0) {
 370                         DEBUGP("nf_ct_h323: expect T.120 ");
 371                         NF_CT_DUMP_TUPLE(&exp->tuple);
 372                 } else
 373                         ret = -1;
 374         }
 375
 376         nf_conntrack_expect_put(exp);
 377
 378         return ret;
 379 }
 380
 381 /****************************************************************************/
 382 static int process_h245_channel(struct sk_buff **pskb,
 383                                 struct nf_conn *ct,
 384                                 enum ip_conntrack_info ctinfo,
 385                                 unsigned char **data, int dataoff,
 386                                 H2250LogicalChannelParameters *channel)
 387 {
 388         int ret;
 389
 390         if (channel->options & eH2250LogicalChannelParameters_mediaChannel) {
 391                 /* RTP */
 392                 ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
 393                                       &channel->mediaChannel);
 394                 if (ret < 0)
 395                         return -1;
 396         }
 397
 398         if (channel->
 399             options & eH2250LogicalChannelParameters_mediaControlChannel) {
 400                 /* RTCP */
 401                 ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
 402                                       &channel->mediaControlChannel);
 403                 if (ret < 0)
 404                         return -1;
 405         }
 406
 407         return 0;
 408 }
 409
 410 /****************************************************************************/
 411 static int process_olc(struct sk_buff **pskb, struct nf_conn *ct,
 412                        enum ip_conntrack_info ctinfo,
 413                        unsigned char **data, int dataoff,
 414                        OpenLogicalChannel *olc)
 415 {
 416         int ret;
 417
 418         DEBUGP("nf_ct_h323: OpenLogicalChannel\n");
 419
 420         if (olc->forwardLogicalChannelParameters.multiplexParameters.choice ==
 421             eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)
 422         {
 423                 ret = process_h245_channel(pskb, ct, ctinfo, data, dataoff,
 424                                            &olc->
 425                                            forwardLogicalChannelParameters.
 426                                            multiplexParameters.
 427                                            h2250LogicalChannelParameters);
 428                 if (ret < 0)
 429                         return -1;
 430         }
 431
 432         if ((olc->options &
 433              eOpenLogicalChannel_reverseLogicalChannelParameters) &&
 434             (olc->reverseLogicalChannelParameters.options &
 435              eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters)
 436             && (olc->reverseLogicalChannelParameters.multiplexParameters.
 437                 choice ==
 438                 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
 439         {
 440                 ret =
 441                     process_h245_channel(pskb, ct, ctinfo, 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(pskb, ct, ctinfo, data, dataoff,
 460                                   &olc->separateStack.networkAddress.
 461                                   localAreaAddress);
 462                 if (ret < 0)
 463                         return -1;
 464         }
 465
 466         return 0;
 467 }
 468
 469 /****************************************************************************/
 470 static int process_olca(struct sk_buff **pskb, struct nf_conn *ct,
 471                         enum ip_conntrack_info ctinfo,
 472                         unsigned char **data, int dataoff,
 473                         OpenLogicalChannelAck *olca)
 474 {
 475         H2250LogicalChannelAckParameters *ack;
 476         int ret;
 477
 478         DEBUGP("nf_ct_h323: OpenLogicalChannelAck\n");
 479
 480         if ((olca->options &
 481              eOpenLogicalChannelAck_reverseLogicalChannelParameters) &&
 482             (olca->reverseLogicalChannelParameters.options &
 483              eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters)
 484             && (olca->reverseLogicalChannelParameters.multiplexParameters.
 485                 choice ==
 486                 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
 487         {
 488                 ret = process_h245_channel(pskb, ct, ctinfo, 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(pskb, ct, ctinfo, data, dataoff,
 508                                               &ack->mediaChannel);
 509                         if (ret < 0)
 510                                 return -1;
 511                 }
 512
 513                 if (ack->options &
 514                     eH2250LogicalChannelAckParameters_mediaControlChannel) {
 515                         /* RTCP */
 516                         ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
 517                                               &ack->mediaControlChannel);
 518                         if (ret < 0)
 519                                 return -1;
 520                 }
 521         }
 522
 523         if ((olca->options & eOpenLogicalChannelAck_separateStack) &&
 524                 olca->separateStack.networkAddress.choice ==
 525                 eNetworkAccessParameters_networkAddress_localAreaAddress) {
 526                 ret = expect_t120(pskb, ct, ctinfo, data, dataoff,
 527                                   &olca->separateStack.networkAddress.
 528                                   localAreaAddress);
 529                 if (ret < 0)
 530                         return -1;
 531         }
 532
 533         return 0;
 534 }
 535
 536 /****************************************************************************/
 537 static int process_h245(struct sk_buff **pskb, struct nf_conn *ct,
 538                         enum ip_conntrack_info ctinfo,
 539                         unsigned char **data, int dataoff,
 540                         MultimediaSystemControlMessage *mscm)
 541 {
 542         switch (mscm->choice) {
 543         case eMultimediaSystemControlMessage_request:
 544                 if (mscm->request.choice ==
 545                     eRequestMessage_openLogicalChannel) {
 546                         return process_olc(pskb, ct, ctinfo, data, dataoff,
 547                                            &mscm->request.openLogicalChannel);
 548                 }
 549                 DEBUGP("nf_ct_h323: H.245 Request %d\n",
 550                        mscm->request.choice);
 551                 break;
 552         case eMultimediaSystemControlMessage_response:
 553                 if (mscm->response.choice ==
 554                     eResponseMessage_openLogicalChannelAck) {
 555                         return process_olca(pskb, ct, ctinfo, data, dataoff,
 556                                             &mscm->response.
 557                                             openLogicalChannelAck);
 558                 }
 559                 DEBUGP("nf_ct_h323: H.245 Response %d\n",
 560                        mscm->response.choice);
 561                 break;
 562         default:
 563                 DEBUGP("nf_ct_h323: H.245 signal %d\n", mscm->choice);
 564                 break;
 565         }
 566
 567         return 0;
 568 }
 569
 570 /****************************************************************************/
 571 static int h245_help(struct sk_buff **pskb, unsigned int protoff,
 572                      struct nf_conn *ct, enum ip_conntrack_info ctinfo)
 573 {
 574         static MultimediaSystemControlMessage mscm;
 575         unsigned char *data = NULL;
 576         int datalen;
 577         int dataoff;
 578         int ret;
 579
 580         /* Until there's been traffic both ways, don't look in packets. */
 581         if (ctinfo != IP_CT_ESTABLISHED &&
 582             ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
 583                 return NF_ACCEPT;
 584         }
 585         DEBUGP("nf_ct_h245: skblen = %u\n", (*pskb)->len);
 586
 587         spin_lock_bh(&nf_h323_lock);
 588
 589         /* Process each TPKT */
 590         while (get_tpkt_data(pskb, protoff, ct, ctinfo,
 591                              &data, &datalen, &dataoff)) {
 592                 DEBUGP("nf_ct_h245: TPKT len=%d ", datalen);
 593                 NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
 594
 595                 /* Decode H.245 signal */
 596                 ret = DecodeMultimediaSystemControlMessage(data, datalen,
 597                                                            &mscm);
 598                 if (ret < 0) {
 599                         if (net_ratelimit())
 600                                 printk("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(pskb, ct, ctinfo, &data, dataoff, &mscm) < 0)
 609                         goto drop;
 610         }
 611
 612         spin_unlock_bh(&nf_h323_lock);
 613         return NF_ACCEPT;
 614
 615       drop:
 616         spin_unlock_bh(&nf_h323_lock);
 617         if (net_ratelimit())
 618                 printk("nf_ct_h245: packet dropped\n");
 619         return NF_DROP;
 620 }
 621
 622 /****************************************************************************/
 623 static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
 624         .name                   = "H.245",
 625         .me                     = THIS_MODULE,
 626         .max_expected           = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */,
 627         .timeout                = 240,
 628         .tuple.dst.protonum     = IPPROTO_UDP,
 629         .mask.src.u.udp.port    = __constant_htons(0xFFFF),
 630         .mask.dst.protonum      = 0xFF,
 631         .help                   = h245_help
 632 };
 633
 634 /****************************************************************************/
 635 int get_h225_addr(struct nf_conn *ct, unsigned char *data,
 636                   TransportAddress *taddr,
 637                   union nf_conntrack_address *addr, __be16 *port)
 638 {
 639         unsigned char *p;
 640         int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
 641         int len;
 642
 643         switch (taddr->choice) {
 644         case eTransportAddress_ipAddress:
 645                 if (family != AF_INET)
 646                         return 0;
 647                 p = data + taddr->ipAddress.ip;
 648                 len = 4;
 649                 break;
 650         case eTransportAddress_ip6Address:
 651                 if (family != 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 /****************************************************************************/
 668 static int expect_h245(struct sk_buff **pskb, struct nf_conn *ct,
 669                        enum ip_conntrack_info ctinfo,
 670                        unsigned char **data, int dataoff,
 671                        TransportAddress *taddr)
 672 {
 673         int dir = CTINFO2DIR(ctinfo);
 674         int ret = 0;
 675         __be16 port;
 676         union nf_conntrack_address addr;
 677         struct nf_conntrack_expect *exp;
 678         typeof(nat_h245_hook) nat_h245;
 679
 680         /* Read h245Address */
 681         if (!get_h225_addr(ct, *data, taddr, &addr, &port) ||
 682             memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
 683             port == 0)
 684                 return 0;
 685
 686         /* Create expect for h245 connection */
 687         if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
 688                 return -1;
 689         nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
 690                                  &ct->tuplehash[!dir].tuple.src.u3,
 691                                  &ct->tuplehash[!dir].tuple.dst.u3,
 692                                  IPPROTO_TCP, NULL, &port);
 693         exp->helper = &nf_conntrack_helper_h245;
 694
 695         if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
 696                    &ct->tuplehash[!dir].tuple.dst.u3,
 697                    sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
 698             (nat_h245 = rcu_dereference(nat_h245_hook)) &&
 699             ct->status & IPS_NAT_MASK) {
 700                 /* NAT needed */
 701                 ret = nat_h245(pskb, ct, ctinfo, data, dataoff, taddr,
 702                                port, exp);
 703         } else {                /* Conntrack only */
 704                 if (nf_conntrack_expect_related(exp) == 0) {
 705                         DEBUGP("nf_ct_q931: expect H.245 ");
 706                         NF_CT_DUMP_TUPLE(&exp->tuple);
 707                 } else
 708                         ret = -1;
 709         }
 710
 711         nf_conntrack_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 static int callforward_do_filter(union nf_conntrack_address *src,
 719                                  union nf_conntrack_address *dst,
 720                                  int family)
 721 {
 722         struct flowi fl1, fl2;
 723         int ret = 0;
 724
 725         memset(&fl1, 0, sizeof(fl1));
 726         memset(&fl2, 0, sizeof(fl2));
 727
 728         switch (family) {
 729         case AF_INET: {
 730                 struct rtable *rt1, *rt2;
 731
 732                 fl1.fl4_dst = src->ip;
 733                 fl2.fl4_dst = dst->ip;
 734                 if (ip_route_output_key(&rt1, &fl1) == 0) {
 735                         if (ip_route_output_key(&rt2, &fl2) == 0) {
 736                                 if (rt1->rt_gateway == rt2->rt_gateway &&
 737                                     rt1->u.dst.dev  == rt2->u.dst.dev)
 738                                         ret = 1;
 739                                 dst_release(&rt2->u.dst);
 740                         }
 741                         dst_release(&rt1->u.dst);
 742                 }
 743                 break;
 744         }
 745 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 746         case AF_INET6: {
 747                 struct rt6_info *rt1, *rt2;
 748
 749                 memcpy(&fl1.fl6_dst, src, sizeof(fl1.fl6_dst));
 750                 memcpy(&fl2.fl6_dst, dst, sizeof(fl2.fl6_dst));
 751                 rt1 = (struct rt6_info *)ip6_route_output(NULL, &fl1);
 752                 if (rt1) {
 753                         rt2 = (struct rt6_info *)ip6_route_output(NULL, &fl2);
 754                         if (rt2) {
 755                                 if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway,
 756                                             sizeof(rt1->rt6i_gateway)) &&
 757                                     rt1->u.dst.dev == rt2->u.dst.dev)
 758                                         ret = 1;
 759                                 dst_release(&rt2->u.dst);
 760                         }
 761                         dst_release(&rt1->u.dst);
 762                 }
 763                 break;
 764         }
 765 #endif
 766         }
 767         return ret;
 768
 769 }
 770
 771 /****************************************************************************/
 772 static int expect_callforwarding(struct sk_buff **pskb,
 773                                  struct nf_conn *ct,
 774                                  enum ip_conntrack_info ctinfo,
 775                                  unsigned char **data, int dataoff,
 776                                  TransportAddress *taddr)
 777 {
 778         int dir = CTINFO2DIR(ctinfo);
 779         int ret = 0;
 780         __be16 port;
 781         union nf_conntrack_address addr;
 782         struct nf_conntrack_expect *exp;
 783         typeof(nat_callforwarding_hook) nat_callforwarding;
 784
 785         /* Read alternativeAddress */
 786         if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0)
 787                 return 0;
 788
 789         /* If the calling party is on the same side of the forward-to party,
 790          * we don't need to track the second call */
 791         if (callforward_filter &&
 792             callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3,
 793                                   ct->tuplehash[!dir].tuple.src.l3num)) {
 794                 DEBUGP("nf_ct_q931: Call Forwarding not tracked\n");
 795                 return 0;
 796         }
 797
 798         /* Create expect for the second call leg */
 799         if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
 800                 return -1;
 801         nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
 802                                  &ct->tuplehash[!dir].tuple.src.u3, &addr,
 803                                  IPPROTO_TCP, NULL, &port);
 804         exp->helper = nf_conntrack_helper_q931;
 805
 806         if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
 807                    &ct->tuplehash[!dir].tuple.dst.u3,
 808                    sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
 809             (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) &&
 810             ct->status & IPS_NAT_MASK) {
 811                 /* Need NAT */
 812                 ret = nat_callforwarding(pskb, ct, ctinfo, data, dataoff,
 813                                          taddr, port, exp);
 814         } else {                /* Conntrack only */
 815                 if (nf_conntrack_expect_related(exp) == 0) {
 816                         DEBUGP("nf_ct_q931: expect Call Forwarding ");
 817                         NF_CT_DUMP_TUPLE(&exp->tuple);
 818                 } else
 819                         ret = -1;
 820         }
 821
 822         nf_conntrack_expect_put(exp);
 823
 824         return ret;
 825 }
 826
 827 /****************************************************************************/
 828 static int process_setup(struct sk_buff **pskb, struct nf_conn *ct,
 829                          enum ip_conntrack_info ctinfo,
 830                          unsigned char **data, int dataoff,
 831                          Setup_UUIE *setup)
 832 {
 833         int dir = CTINFO2DIR(ctinfo);
 834         int ret;
 835         int i;
 836         __be16 port;
 837         union nf_conntrack_address addr;
 838         typeof(set_h225_addr_hook) set_h225_addr;
 839
 840         DEBUGP("nf_ct_q931: Setup\n");
 841
 842         if (setup->options & eSetup_UUIE_h245Address) {
 843                 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
 844                                   &setup->h245Address);
 845                 if (ret < 0)
 846                         return -1;
 847         }
 848
 849         set_h225_addr = rcu_dereference(set_h225_addr_hook);
 850         if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
 851             (set_h225_addr) && ct->status && IPS_NAT_MASK &&
 852             get_h225_addr(ct, *data, &setup->destCallSignalAddress,
 853                           &addr, &port) &&
 854             memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
 855                 DEBUGP("nf_ct_q931: set destCallSignalAddress "
 856                        NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n",
 857                        NIP6(*(struct in6_addr *)&addr), ntohs(port),
 858                        NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.src.u3),
 859                        ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
 860                 ret = set_h225_addr(pskb, data, dataoff,
 861                                     &setup->destCallSignalAddress,
 862                                     &ct->tuplehash[!dir].tuple.src.u3,
 863                                     ct->tuplehash[!dir].tuple.src.u.tcp.port);
 864                 if (ret < 0)
 865                         return -1;
 866         }
 867
 868         if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
 869             (set_h225_addr) && ct->status & IPS_NAT_MASK &&
 870             get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
 871                           &addr, &port) &&
 872             memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
 873                 DEBUGP("nf_ct_q931: set sourceCallSignalAddress "
 874                        NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n",
 875                        NIP6(*(struct in6_addr *)&addr), ntohs(port),
 876                        NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.dst.u3),
 877                        ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
 878                 ret = set_h225_addr(pskb, data, dataoff,
 879                                     &setup->sourceCallSignalAddress,
 880                                     &ct->tuplehash[!dir].tuple.dst.u3,
 881                                     ct->tuplehash[!dir].tuple.dst.u.tcp.port);
 882                 if (ret < 0)
 883                         return -1;
 884         }
 885
 886         if (setup->options & eSetup_UUIE_fastStart) {
 887                 for (i = 0; i < setup->fastStart.count; i++) {
 888                         ret = process_olc(pskb, ct, ctinfo, data, dataoff,
 889                                           &setup->fastStart.item[i]);
 890                         if (ret < 0)
 891                                 return -1;
 892                 }
 893         }
 894
 895         return 0;
 896 }
 897
 898 /****************************************************************************/
 899 static int process_callproceeding(struct sk_buff **pskb,
 900                                   struct nf_conn *ct,
 901                                   enum ip_conntrack_info ctinfo,
 902                                   unsigned char **data, int dataoff,
 903                                   CallProceeding_UUIE *callproc)
 904 {
 905         int ret;
 906         int i;
 907
 908         DEBUGP("nf_ct_q931: CallProceeding\n");
 909
 910         if (callproc->options & eCallProceeding_UUIE_h245Address) {
 911                 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
 912                                   &callproc->h245Address);
 913                 if (ret < 0)
 914                         return -1;
 915         }
 916
 917         if (callproc->options & eCallProceeding_UUIE_fastStart) {
 918                 for (i = 0; i < callproc->fastStart.count; i++) {
 919                         ret = process_olc(pskb, ct, ctinfo, data, dataoff,
 920                                           &callproc->fastStart.item[i]);
 921                         if (ret < 0)
 922                                 return -1;
 923                 }
 924         }
 925
 926         return 0;
 927 }
 928
 929 /****************************************************************************/
 930 static int process_connect(struct sk_buff **pskb, struct nf_conn *ct,
 931                            enum ip_conntrack_info ctinfo,
 932                            unsigned char **data, int dataoff,
 933                            Connect_UUIE *connect)
 934 {
 935         int ret;
 936         int i;
 937
 938         DEBUGP("nf_ct_q931: Connect\n");
 939
 940         if (connect->options & eConnect_UUIE_h245Address) {
 941                 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
 942                                   &connect->h245Address);
 943                 if (ret < 0)
 944                         return -1;
 945         }
 946
 947         if (connect->options & eConnect_UUIE_fastStart) {
 948                 for (i = 0; i < connect->fastStart.count; i++) {
 949                         ret = process_olc(pskb, ct, ctinfo, data, dataoff,
 950                                           &connect->fastStart.item[i]);
 951                         if (ret < 0)
 952                                 return -1;
 953                 }
 954         }
 955
 956         return 0;
 957 }
 958
 959 /****************************************************************************/
 960 static int process_alerting(struct sk_buff **pskb, struct nf_conn *ct,
 961                             enum ip_conntrack_info ctinfo,
 962                             unsigned char **data, int dataoff,
 963                             Alerting_UUIE *alert)
 964 {
 965         int ret;
 966         int i;
 967
 968         DEBUGP("nf_ct_q931: Alerting\n");
 969
 970         if (alert->options & eAlerting_UUIE_h245Address) {
 971                 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
 972                                   &alert->h245Address);
 973                 if (ret < 0)
 974                         return -1;
 975         }
 976
 977         if (alert->options & eAlerting_UUIE_fastStart) {
 978                 for (i = 0; i < alert->fastStart.count; i++) {
 979                         ret = process_olc(pskb, ct, ctinfo, data, dataoff,
 980                                           &alert->fastStart.item[i]);
 981                         if (ret < 0)
 982                                 return -1;
 983                 }
 984         }
 985
 986         return 0;
 987 }
 988
 989 /****************************************************************************/
 990 static int process_facility(struct sk_buff **pskb, struct nf_conn *ct,
 991                             enum ip_conntrack_info ctinfo,
 992                             unsigned char **data, int dataoff,
 993                             Facility_UUIE *facility)
 994 {
 995         int ret;
 996         int i;
 997
 998         DEBUGP("nf_ct_q931: Facility\n");
 999
1000         if (facility->reason.choice == eFacilityReason_callForwarded) {
1001                 if (facility->options & eFacility_UUIE_alternativeAddress)
1002                         return expect_callforwarding(pskb, ct, ctinfo, data,
1003                                                      dataoff,
1004                                                      &facility->
1005                                                      alternativeAddress);
1006                 return 0;
1007         }
1008
1009         if (facility->options & eFacility_UUIE_h245Address) {
1010                 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
1011                                   &facility->h245Address);
1012                 if (ret < 0)
1013                         return -1;
1014         }
1015
1016         if (facility->options & eFacility_UUIE_fastStart) {
1017                 for (i = 0; i < facility->fastStart.count; i++) {
1018                         ret = process_olc(pskb, ct, ctinfo, data, dataoff,
1019                                           &facility->fastStart.item[i]);
1020                         if (ret < 0)
1021                                 return -1;
1022                 }
1023         }
1024
1025         return 0;
1026 }
1027
1028 /****************************************************************************/
1029 static int process_progress(struct sk_buff **pskb, struct nf_conn *ct,
1030                             enum ip_conntrack_info ctinfo,
1031                             unsigned char **data, int dataoff,
1032                             Progress_UUIE *progress)
1033 {
1034         int ret;
1035         int i;
1036
1037         DEBUGP("nf_ct_q931: Progress\n");
1038
1039         if (progress->options & eProgress_UUIE_h245Address) {
1040                 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
1041                                   &progress->h245Address);
1042                 if (ret < 0)
1043                         return -1;
1044         }
1045
1046         if (progress->options & eProgress_UUIE_fastStart) {
1047                 for (i = 0; i < progress->fastStart.count; i++) {
1048                         ret = process_olc(pskb, ct, ctinfo, data, dataoff,
1049                                           &progress->fastStart.item[i]);
1050                         if (ret < 0)
1051                                 return -1;
1052                 }
1053         }
1054
1055         return 0;
1056 }
1057
1058 /****************************************************************************/
1059 static int process_q931(struct sk_buff **pskb, struct nf_conn *ct,
1060                         enum ip_conntrack_info ctinfo,
1061                         unsigned char **data, int dataoff, Q931 *q931)
1062 {
1063         H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
1064         int i;
1065         int ret = 0;
1066
1067         switch (pdu->h323_message_body.choice) {
1068         case eH323_UU_PDU_h323_message_body_setup:
1069                 ret = process_setup(pskb, ct, ctinfo, data, dataoff,
1070                                     &pdu->h323_message_body.setup);
1071                 break;
1072         case eH323_UU_PDU_h323_message_body_callProceeding:
1073                 ret = process_callproceeding(pskb, ct, ctinfo, data, dataoff,
1074                                              &pdu->h323_message_body.
1075                                              callProceeding);
1076                 break;
1077         case eH323_UU_PDU_h323_message_body_connect:
1078                 ret = process_connect(pskb, ct, ctinfo, data, dataoff,
1079                                       &pdu->h323_message_body.connect);
1080                 break;
1081         case eH323_UU_PDU_h323_message_body_alerting:
1082                 ret = process_alerting(pskb, ct, ctinfo, data, dataoff,
1083                                        &pdu->h323_message_body.alerting);
1084                 break;
1085         case eH323_UU_PDU_h323_message_body_facility:
1086                 ret = process_facility(pskb, ct, ctinfo, data, dataoff,
1087                                        &pdu->h323_message_body.facility);
1088                 break;
1089         case eH323_UU_PDU_h323_message_body_progress:
1090                 ret = process_progress(pskb, ct, ctinfo, data, dataoff,
1091                                        &pdu->h323_message_body.progress);
1092                 break;
1093         default:
1094                 DEBUGP("nf_ct_q931: Q.931 signal %d\n",
1095                        pdu->h323_message_body.choice);
1096                 break;
1097         }
1098
1099         if (ret < 0)
1100                 return -1;
1101
1102         if (pdu->options & eH323_UU_PDU_h245Control) {
1103                 for (i = 0; i < pdu->h245Control.count; i++) {
1104                         ret = process_h245(pskb, ct, ctinfo, data, dataoff,
1105                                            &pdu->h245Control.item[i]);
1106                         if (ret < 0)
1107                                 return -1;
1108                 }
1109         }
1110
1111         return 0;
1112 }
1113
1114 /****************************************************************************/
1115 static int q931_help(struct sk_buff **pskb, unsigned int protoff,
1116                      struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1117 {
1118         static Q931 q931;
1119         unsigned char *data = NULL;
1120         int datalen;
1121         int dataoff;
1122         int ret;
1123
1124         /* Until there's been traffic both ways, don't look in packets. */
1125         if (ctinfo != IP_CT_ESTABLISHED &&
1126             ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
1127                 return NF_ACCEPT;
1128         }
1129         DEBUGP("nf_ct_q931: skblen = %u\n", (*pskb)->len);
1130
1131         spin_lock_bh(&nf_h323_lock);
1132
1133         /* Process each TPKT */
1134         while (get_tpkt_data(pskb, protoff, ct, ctinfo,
1135                              &data, &datalen, &dataoff)) {
1136                 DEBUGP("nf_ct_q931: TPKT len=%d ", datalen);
1137                 NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1138
1139                 /* Decode Q.931 signal */
1140                 ret = DecodeQ931(data, datalen, &q931);
1141                 if (ret < 0) {
1142                         if (net_ratelimit())
1143                                 printk("nf_ct_q931: decoding error: %s\n",
1144                                        ret == H323_ERROR_BOUND ?
1145                                        "out of bound" : "out of range");
1146                         /* We don't drop when decoding error */
1147                         break;
1148                 }
1149
1150                 /* Process Q.931 signal */
1151                 if (process_q931(pskb, ct, ctinfo, &data, dataoff, &q931) < 0)
1152                         goto drop;
1153         }
1154
1155         spin_unlock_bh(&nf_h323_lock);
1156         return NF_ACCEPT;
1157
1158       drop:
1159         spin_unlock_bh(&nf_h323_lock);
1160         if (net_ratelimit())
1161                 printk("nf_ct_q931: packet dropped\n");
1162         return NF_DROP;
1163 }
1164
1165 /****************************************************************************/
1166 static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
1167         {
1168                 .name                   = "Q.931",
1169                 .me                     = THIS_MODULE,
1170                                           /* T.120 and H.245 */
1171                 .max_expected           = H323_RTP_CHANNEL_MAX * 4 + 4,
1172                 .timeout                = 240,
1173                 .tuple.src.l3num        = AF_INET,
1174                 .tuple.src.u.tcp.port   = __constant_htons(Q931_PORT),
1175                 .tuple.dst.protonum     = IPPROTO_TCP,
1176                 .mask.src.l3num         = 0xFFFF,
1177                 .mask.src.u.tcp.port    = __constant_htons(0xFFFF),
1178                 .mask.dst.protonum      = 0xFF,
1179                 .help                   = q931_help
1180         },
1181         {
1182                 .name                   = "Q.931",
1183                 .me                     = THIS_MODULE,
1184                                           /* T.120 and H.245 */
1185                 .max_expected           = H323_RTP_CHANNEL_MAX * 4 + 4,
1186                 .timeout                = 240,
1187                 .tuple.src.l3num        = AF_INET6,
1188                 .tuple.src.u.tcp.port   = __constant_htons(Q931_PORT),
1189                 .tuple.dst.protonum     = IPPROTO_TCP,
1190                 .mask.src.l3num         = 0xFFFF,
1191                 .mask.src.u.tcp.port    = __constant_htons(0xFFFF),
1192                 .mask.dst.protonum      = 0xFF,
1193                 .help                   = q931_help
1194         },
1195 };
1196
1197 /****************************************************************************/
1198 static unsigned char *get_udp_data(struct sk_buff **pskb, unsigned int protoff,
1199                                    int *datalen)
1200 {
1201         struct udphdr _uh, *uh;
1202         int dataoff;
1203
1204         uh = skb_header_pointer(*pskb, protoff, sizeof(_uh), &_uh);
1205         if (uh == NULL)
1206                 return NULL;
1207         dataoff = protoff + sizeof(_uh);
1208         if (dataoff >= (*pskb)->len)
1209                 return NULL;
1210         *datalen = (*pskb)->len - dataoff;
1211         return skb_header_pointer(*pskb, dataoff, *datalen, h323_buffer);
1212 }
1213
1214 /****************************************************************************/
1215 static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
1216                                                union nf_conntrack_address *addr,
1217                                                __be16 port)
1218 {
1219         struct nf_conntrack_expect *exp;
1220         struct nf_conntrack_tuple tuple;
1221
1222         memset(&tuple.src.u3, 0, sizeof(tuple.src.u3));
1223         tuple.src.u.tcp.port = 0;
1224         memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3));
1225         tuple.dst.u.tcp.port = port;
1226         tuple.dst.protonum = IPPROTO_TCP;
1227
1228         exp = __nf_conntrack_expect_find(&tuple);
1229         if (exp && exp->master == ct)
1230                 return exp;
1231         return NULL;
1232 }
1233
1234 /****************************************************************************/
1235 static int set_expect_timeout(struct nf_conntrack_expect *exp,
1236                               unsigned timeout)
1237 {
1238         if (!exp || !del_timer(&exp->timeout))
1239                 return 0;
1240
1241         exp->timeout.expires = jiffies + timeout * HZ;
1242         add_timer(&exp->timeout);
1243
1244         return 1;
1245 }
1246
1247 /****************************************************************************/
1248 static int expect_q931(struct sk_buff **pskb, struct nf_conn *ct,
1249                        enum ip_conntrack_info ctinfo,
1250                        unsigned char **data,
1251                        TransportAddress *taddr, int count)
1252 {
1253         struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1254         int dir = CTINFO2DIR(ctinfo);
1255         int ret = 0;
1256         int i;
1257         __be16 port;
1258         union nf_conntrack_address addr;
1259         struct nf_conntrack_expect *exp;
1260         typeof(nat_q931_hook) nat_q931;
1261
1262         /* Look for the first related address */
1263         for (i = 0; i < count; i++) {
1264                 if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
1265                     memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3,
1266                            sizeof(addr)) == 0 && port != 0)
1267                         break;
1268         }
1269
1270         if (i >= count)         /* Not found */
1271                 return 0;
1272
1273         /* Create expect for Q.931 */
1274         if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
1275                 return -1;
1276         nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1277                                  gkrouted_only ? /* only accept calls from GK? */
1278                                         &ct->tuplehash[!dir].tuple.src.u3 :
1279                                         NULL,
1280                                  &ct->tuplehash[!dir].tuple.dst.u3,
1281                                  IPPROTO_TCP, NULL, &port);
1282         exp->helper = nf_conntrack_helper_q931;
1283         exp->flags = NF_CT_EXPECT_PERMANENT;    /* Accept multiple calls */
1284
1285         nat_q931 = rcu_dereference(nat_q931_hook);
1286         if (nat_q931 && ct->status & IPS_NAT_MASK) {    /* Need NAT */
1287                 ret = nat_q931(pskb, ct, ctinfo, data, taddr, i, port, exp);
1288         } else {                /* Conntrack only */
1289                 if (nf_conntrack_expect_related(exp) == 0) {
1290                         DEBUGP("nf_ct_ras: expect Q.931 ");
1291                         NF_CT_DUMP_TUPLE(&exp->tuple);
1292
1293                         /* Save port for looking up expect in processing RCF */
1294                         info->sig_port[dir] = port;
1295                 } else
1296                         ret = -1;
1297         }
1298
1299         nf_conntrack_expect_put(exp);
1300
1301         return ret;
1302 }
1303
1304 /****************************************************************************/
1305 static int process_grq(struct sk_buff **pskb, struct nf_conn *ct,
1306                        enum ip_conntrack_info ctinfo,
1307                        unsigned char **data, GatekeeperRequest *grq)
1308 {
1309         typeof(set_ras_addr_hook) set_ras_addr;
1310
1311         DEBUGP("nf_ct_ras: GRQ\n");
1312
1313         set_ras_addr = rcu_dereference(set_ras_addr_hook);
1314         if (set_ras_addr && ct->status & IPS_NAT_MASK)  /* NATed */
1315                 return set_ras_addr(pskb, ct, ctinfo, data,
1316                                     &grq->rasAddress, 1);
1317         return 0;
1318 }
1319
1320 /****************************************************************************/
1321 static int process_gcf(struct sk_buff **pskb, struct nf_conn *ct,
1322                        enum ip_conntrack_info ctinfo,
1323                        unsigned char **data, GatekeeperConfirm *gcf)
1324 {
1325         int dir = CTINFO2DIR(ctinfo);
1326         int ret = 0;
1327         __be16 port;
1328         union nf_conntrack_address addr;
1329         struct nf_conntrack_expect *exp;
1330
1331         DEBUGP("nf_ct_ras: GCF\n");
1332
1333         if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port))
1334                 return 0;
1335
1336         /* Registration port is the same as discovery port */
1337         if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1338             port == ct->tuplehash[dir].tuple.src.u.udp.port)
1339                 return 0;
1340
1341         /* Avoid RAS expectation loops. A GCF is never expected. */
1342         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1343                 return 0;
1344
1345         /* Need new expect */
1346         if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
1347                 return -1;
1348         nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1349                                  &ct->tuplehash[!dir].tuple.src.u3, &addr,
1350                                  IPPROTO_UDP, NULL, &port);
1351         exp->helper = nf_conntrack_helper_ras;
1352
1353         if (nf_conntrack_expect_related(exp) == 0) {
1354                 DEBUGP("nf_ct_ras: expect RAS ");
1355                 NF_CT_DUMP_TUPLE(&exp->tuple);
1356         } else
1357                 ret = -1;
1358
1359         nf_conntrack_expect_put(exp);
1360
1361         return ret;
1362 }
1363
1364 /****************************************************************************/
1365 static int process_rrq(struct sk_buff **pskb, struct nf_conn *ct,
1366                        enum ip_conntrack_info ctinfo,
1367                        unsigned char **data, RegistrationRequest *rrq)
1368 {
1369         struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1370         int ret;
1371         typeof(set_ras_addr_hook) set_ras_addr;
1372
1373         DEBUGP("nf_ct_ras: RRQ\n");
1374
1375         ret = expect_q931(pskb, ct, ctinfo, data,
1376                           rrq->callSignalAddress.item,
1377                           rrq->callSignalAddress.count);
1378         if (ret < 0)
1379                 return -1;
1380
1381         set_ras_addr = rcu_dereference(set_ras_addr_hook);
1382         if (set_ras_addr && ct->status & IPS_NAT_MASK) {
1383                 ret = set_ras_addr(pskb, ct, ctinfo, 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                 DEBUGP("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 /****************************************************************************/
1400 static int process_rcf(struct sk_buff **pskb, struct nf_conn *ct,
1401                        enum ip_conntrack_info ctinfo,
1402                        unsigned char **data, RegistrationConfirm *rcf)
1403 {
1404         struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
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         DEBUGP("nf_ct_ras: RCF\n");
1411
1412         set_sig_addr = rcu_dereference(set_sig_addr_hook);
1413         if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1414                 ret = set_sig_addr(pskb, ct, ctinfo, data,
1415                                         rcf->callSignalAddress.item,
1416                                         rcf->callSignalAddress.count);
1417                 if (ret < 0)
1418                         return -1;
1419         }
1420
1421         if (rcf->options & eRegistrationConfirm_timeToLive) {
1422                 DEBUGP("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
1423                 info->timeout = rcf->timeToLive;
1424         }
1425
1426         if (info->timeout > 0) {
1427                 DEBUGP
1428                     ("nf_ct_ras: set RAS connection timeout to %u seconds\n",
1429                      info->timeout);
1430                 nf_ct_refresh(ct, *pskb, info->timeout * HZ);
1431
1432                 /* Set expect timeout */
1433                 read_lock_bh(&nf_conntrack_lock);
1434                 exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
1435                                   info->sig_port[!dir]);
1436                 if (exp) {
1437                         DEBUGP("nf_ct_ras: set Q.931 expect "
1438                                "timeout to %u seconds for",
1439                                info->timeout);
1440                         NF_CT_DUMP_TUPLE(&exp->tuple);
1441                         set_expect_timeout(exp, info->timeout);
1442                 }
1443                 read_unlock_bh(&nf_conntrack_lock);
1444         }
1445
1446         return 0;
1447 }
1448
1449 /****************************************************************************/
1450 static int process_urq(struct sk_buff **pskb, struct nf_conn *ct,
1451                        enum ip_conntrack_info ctinfo,
1452                        unsigned char **data, UnregistrationRequest *urq)
1453 {
1454         struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1455         int dir = CTINFO2DIR(ctinfo);
1456         int ret;
1457         typeof(set_sig_addr_hook) set_sig_addr;
1458
1459         DEBUGP("nf_ct_ras: URQ\n");
1460
1461         set_sig_addr = rcu_dereference(set_sig_addr_hook);
1462         if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1463                 ret = set_sig_addr(pskb, ct, ctinfo, data,
1464                                    urq->callSignalAddress.item,
1465                                    urq->callSignalAddress.count);
1466                 if (ret < 0)
1467                         return -1;
1468         }
1469
1470         /* Clear old expect */
1471         nf_ct_remove_expectations(ct);
1472         info->sig_port[dir] = 0;
1473         info->sig_port[!dir] = 0;
1474
1475         /* Give it 30 seconds for UCF or URJ */
1476         nf_ct_refresh(ct, *pskb, 30 * HZ);
1477
1478         return 0;
1479 }
1480
1481 /****************************************************************************/
1482 static int process_arq(struct sk_buff **pskb, struct nf_conn *ct,
1483                        enum ip_conntrack_info ctinfo,
1484                        unsigned char **data, AdmissionRequest *arq)
1485 {
1486         struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1487         int dir = CTINFO2DIR(ctinfo);
1488         __be16 port;
1489         union nf_conntrack_address addr;
1490         typeof(set_h225_addr_hook) set_h225_addr;
1491
1492         DEBUGP("nf_ct_ras: ARQ\n");
1493
1494         set_h225_addr = rcu_dereference(set_h225_addr_hook);
1495         if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
1496             get_h225_addr(ct, *data, &arq->destCallSignalAddress,
1497                           &addr, &port) &&
1498             !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1499             port == info->sig_port[dir] &&
1500             set_h225_addr && ct->status & IPS_NAT_MASK) {
1501                 /* Answering ARQ */
1502                 return set_h225_addr(pskb, data, 0,
1503                                      &arq->destCallSignalAddress,
1504                                      &ct->tuplehash[!dir].tuple.dst.u3,
1505                                      info->sig_port[!dir]);
1506         }
1507
1508         if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
1509             get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
1510                           &addr, &port) &&
1511             !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1512             set_h225_addr && ct->status & IPS_NAT_MASK) {
1513                 /* Calling ARQ */
1514                 return set_h225_addr(pskb, data, 0,
1515                                      &arq->srcCallSignalAddress,
1516                                      &ct->tuplehash[!dir].tuple.dst.u3,
1517                                      port);
1518         }
1519
1520         return 0;
1521 }
1522
1523 /****************************************************************************/
1524 static int process_acf(struct sk_buff **pskb, struct nf_conn *ct,
1525                        enum ip_conntrack_info ctinfo,
1526                        unsigned char **data, AdmissionConfirm *acf)
1527 {
1528         int dir = CTINFO2DIR(ctinfo);
1529         int ret = 0;
1530         __be16 port;
1531         union nf_conntrack_address addr;
1532         struct nf_conntrack_expect *exp;
1533         typeof(set_sig_addr_hook) set_sig_addr;
1534
1535         DEBUGP("nf_ct_ras: ACF\n");
1536
1537         if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
1538                            &addr, &port))
1539                 return 0;
1540
1541         if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
1542                 /* Answering ACF */
1543                 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1544                 if (set_sig_addr && ct->status & IPS_NAT_MASK)
1545                         return set_sig_addr(pskb, ct, ctinfo, data,
1546                                             &acf->destCallSignalAddress, 1);
1547                 return 0;
1548         }
1549
1550         /* Need new expect */
1551         if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
1552                 return -1;
1553         nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1554                                  &ct->tuplehash[!dir].tuple.src.u3, &addr,
1555                                  IPPROTO_TCP, NULL, &port);
1556         exp->flags = NF_CT_EXPECT_PERMANENT;
1557         exp->helper = nf_conntrack_helper_q931;
1558
1559         if (nf_conntrack_expect_related(exp) == 0) {
1560                 DEBUGP("nf_ct_ras: expect Q.931 ");
1561                 NF_CT_DUMP_TUPLE(&exp->tuple);
1562         } else
1563                 ret = -1;
1564
1565         nf_conntrack_expect_put(exp);
1566
1567         return ret;
1568 }
1569
1570 /****************************************************************************/
1571 static int process_lrq(struct sk_buff **pskb, struct nf_conn *ct,
1572                        enum ip_conntrack_info ctinfo,
1573                        unsigned char **data, LocationRequest *lrq)
1574 {
1575         typeof(set_ras_addr_hook) set_ras_addr;
1576
1577         DEBUGP("nf_ct_ras: LRQ\n");
1578
1579         set_ras_addr = rcu_dereference(set_ras_addr_hook);
1580         if (set_ras_addr && ct->status & IPS_NAT_MASK)
1581                 return set_ras_addr(pskb, ct, ctinfo, data,
1582                                     &lrq->replyAddress, 1);
1583         return 0;
1584 }
1585
1586 /****************************************************************************/
1587 static int process_lcf(struct sk_buff **pskb, struct nf_conn *ct,
1588                        enum ip_conntrack_info ctinfo,
1589                        unsigned char **data, LocationConfirm *lcf)
1590 {
1591         int dir = CTINFO2DIR(ctinfo);
1592         int ret = 0;
1593         __be16 port;
1594         union nf_conntrack_address addr;
1595         struct nf_conntrack_expect *exp;
1596
1597         DEBUGP("nf_ct_ras: LCF\n");
1598
1599         if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
1600                            &addr, &port))
1601                 return 0;
1602
1603         /* Need new expect for call signal */
1604         if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
1605                 return -1;
1606         nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1607                                  &ct->tuplehash[!dir].tuple.src.u3, &addr,
1608                                  IPPROTO_TCP, NULL, &port);
1609         exp->flags = NF_CT_EXPECT_PERMANENT;
1610         exp->helper = nf_conntrack_helper_q931;
1611
1612         if (nf_conntrack_expect_related(exp) == 0) {
1613                 DEBUGP("nf_ct_ras: expect Q.931 ");
1614                 NF_CT_DUMP_TUPLE(&exp->tuple);
1615         } else
1616                 ret = -1;
1617
1618         nf_conntrack_expect_put(exp);
1619
1620         /* Ignore rasAddress */
1621
1622         return ret;
1623 }
1624
1625 /****************************************************************************/
1626 static int process_irr(struct sk_buff **pskb, struct nf_conn *ct,
1627                        enum ip_conntrack_info ctinfo,
1628                        unsigned char **data, InfoRequestResponse *irr)
1629 {
1630         int ret;
1631         typeof(set_ras_addr_hook) set_ras_addr;
1632         typeof(set_sig_addr_hook) set_sig_addr;
1633
1634         DEBUGP("nf_ct_ras: IRR\n");
1635
1636         set_ras_addr = rcu_dereference(set_ras_addr_hook);
1637         if (set_ras_addr && ct->status & IPS_NAT_MASK) {
1638                 ret = set_ras_addr(pskb, ct, ctinfo, data,
1639                                    &irr->rasAddress, 1);
1640                 if (ret < 0)
1641                         return -1;
1642         }
1643
1644         set_sig_addr = rcu_dereference(set_sig_addr_hook);
1645         if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1646                 ret = set_sig_addr(pskb, ct, ctinfo, data,
1647                                         irr->callSignalAddress.item,
1648                                         irr->callSignalAddress.count);
1649                 if (ret < 0)
1650                         return -1;
1651         }
1652
1653         return 0;
1654 }
1655
1656 /****************************************************************************/
1657 static int process_ras(struct sk_buff **pskb, struct nf_conn *ct,
1658                        enum ip_conntrack_info ctinfo,
1659                        unsigned char **data, RasMessage *ras)
1660 {
1661         switch (ras->choice) {
1662         case eRasMessage_gatekeeperRequest:
1663                 return process_grq(pskb, ct, ctinfo, data,
1664                                    &ras->gatekeeperRequest);
1665         case eRasMessage_gatekeeperConfirm:
1666                 return process_gcf(pskb, ct, ctinfo, data,
1667                                    &ras->gatekeeperConfirm);
1668         case eRasMessage_registrationRequest:
1669                 return process_rrq(pskb, ct, ctinfo, data,
1670                                    &ras->registrationRequest);
1671         case eRasMessage_registrationConfirm:
1672                 return process_rcf(pskb, ct, ctinfo, data,
1673                                    &ras->registrationConfirm);
1674         case eRasMessage_unregistrationRequest:
1675                 return process_urq(pskb, ct, ctinfo, data,
1676                                    &ras->unregistrationRequest);
1677         case eRasMessage_admissionRequest:
1678                 return process_arq(pskb, ct, ctinfo, data,
1679                                    &ras->admissionRequest);
1680         case eRasMessage_admissionConfirm:
1681                 return process_acf(pskb, ct, ctinfo, data,
1682                                    &ras->admissionConfirm);
1683         case eRasMessage_locationRequest:
1684                 return process_lrq(pskb, ct, ctinfo, data,
1685                                    &ras->locationRequest);
1686         case eRasMessage_locationConfirm:
1687                 return process_lcf(pskb, ct, ctinfo, data,
1688                                    &ras->locationConfirm);
1689         case eRasMessage_infoRequestResponse:
1690                 return process_irr(pskb, ct, ctinfo, data,
1691                                    &ras->infoRequestResponse);
1692         default:
1693                 DEBUGP("nf_ct_ras: RAS message %d\n", ras->choice);
1694                 break;
1695         }
1696
1697         return 0;
1698 }
1699
1700 /****************************************************************************/
1701 static int ras_help(struct sk_buff **pskb, unsigned int protoff,
1702                     struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1703 {
1704         static RasMessage ras;
1705         unsigned char *data;
1706         int datalen = 0;
1707         int ret;
1708
1709         DEBUGP("nf_ct_ras: skblen = %u\n", (*pskb)->len);
1710
1711         spin_lock_bh(&nf_h323_lock);
1712
1713         /* Get UDP data */
1714         data = get_udp_data(pskb, protoff, &datalen);
1715         if (data == NULL)
1716                 goto accept;
1717         DEBUGP("nf_ct_ras: RAS message len=%d ", datalen);
1718         NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1719
1720         /* Decode RAS message */
1721         ret = DecodeRasMessage(data, datalen, &ras);
1722         if (ret < 0) {
1723                 if (net_ratelimit())
1724                         printk("nf_ct_ras: decoding error: %s\n",
1725                                ret == H323_ERROR_BOUND ?
1726                                "out of bound" : "out of range");
1727                 goto accept;
1728         }
1729
1730         /* Process RAS message */
1731         if (process_ras(pskb, ct, ctinfo, &data, &ras) < 0)
1732                 goto drop;
1733
1734       accept:
1735         spin_unlock_bh(&nf_h323_lock);
1736         return NF_ACCEPT;
1737
1738       drop:
1739         spin_unlock_bh(&nf_h323_lock);
1740         if (net_ratelimit())
1741                 printk("nf_ct_ras: packet dropped\n");
1742         return NF_DROP;
1743 }
1744
1745 /****************************************************************************/
1746 static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
1747         {
1748                 .name                   = "RAS",
1749                 .me                     = THIS_MODULE,
1750                 .max_expected           = 32,
1751                 .timeout                = 240,
1752                 .tuple.src.l3num        = AF_INET,
1753                 .tuple.src.u.udp.port   = __constant_htons(RAS_PORT),
1754                 .tuple.dst.protonum     = IPPROTO_UDP,
1755                 .mask.src.l3num         = 0xFFFF,
1756                 .mask.src.u.udp.port    = __constant_htons(0xFFFF),
1757                 .mask.dst.protonum      = 0xFF,
1758                 .help                   = ras_help,
1759         },
1760         {
1761                 .name                   = "RAS",
1762                 .me                     = THIS_MODULE,
1763                 .max_expected           = 32,
1764                 .timeout                = 240,
1765                 .tuple.src.l3num        = AF_INET6,
1766                 .tuple.src.u.udp.port   = __constant_htons(RAS_PORT),
1767                 .tuple.dst.protonum     = IPPROTO_UDP,
1768                 .mask.src.l3num         = 0xFFFF,
1769                 .mask.src.u.udp.port    = __constant_htons(0xFFFF),
1770                 .mask.dst.protonum      = 0xFF,
1771                 .help                   = ras_help,
1772         },
1773 };
1774
1775 /****************************************************************************/
1776 static void __exit nf_conntrack_h323_fini(void)
1777 {
1778         nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]);
1779         nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1780         nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1781         nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
1782         kfree(h323_buffer);
1783         DEBUGP("nf_ct_h323: fini\n");
1784 }
1785
1786 /****************************************************************************/
1787 static int __init nf_conntrack_h323_init(void)
1788 {
1789         int ret;
1790
1791         h323_buffer = kmalloc(65536, GFP_KERNEL);
1792         if (!h323_buffer)
1793                 return -ENOMEM;
1794         ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]);
1795         if (ret < 0)
1796                 goto err1;
1797         ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]);
1798         if (ret < 0)
1799                 goto err2;
1800         ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]);
1801         if (ret < 0)
1802                 goto err3;
1803         ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]);
1804         if (ret < 0)
1805                 goto err4;
1806         DEBUGP("nf_ct_h323: init success\n");
1807         return 0;
1808
1809 err4:
1810         nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1811 err3:
1812         nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1813 err2:
1814         nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
1815 err1:
1816         return ret;
1817 }
1818
1819 /****************************************************************************/
1820 module_init(nf_conntrack_h323_init);
1821 module_exit(nf_conntrack_h323_fini);
1822
1823 EXPORT_SYMBOL_GPL(get_h225_addr);
1824 EXPORT_SYMBOL_GPL(set_h245_addr_hook);
1825 EXPORT_SYMBOL_GPL(set_h225_addr_hook);
1826 EXPORT_SYMBOL_GPL(set_sig_addr_hook);
1827 EXPORT_SYMBOL_GPL(set_ras_addr_hook);
1828 EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
1829 EXPORT_SYMBOL_GPL(nat_t120_hook);
1830 EXPORT_SYMBOL_GPL(nat_h245_hook);
1831 EXPORT_SYMBOL_GPL(nat_callforwarding_hook);
1832 EXPORT_SYMBOL_GPL(nat_q931_hook);
1833
1834 MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1835 MODULE_DESCRIPTION("H.323 connection tracking helper");
1836 MODULE_LICENSE("GPL");
1837 MODULE_ALIAS("ip_conntrack_h323");